• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A covering fabric for power transmission belts that has two or more alternating stripes or bands with different friction properties. The stripes can be different fabric constructions. The fabric may be woven or knitted with stripes of different surface or yarn densities, different permeabilities, or different openings. The fabric can cover a surface of a V-ribbed belt, V-belt, toothed belt, flat belt, round belt, or other drive belt, resulting in stripes with different amounts of rubber penetration or different friction coefficients. The stripes can be different compositions of rubber or flocking or other materials. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2748214A1
    申请号:ES201930541
    申请日:2019-06-13
    公开日:2020-03-13
    发明作者:Karla J Bier；Lidia García；David Tornero；Vega Colom；Jordi Graner；Brett Bertrand
    申请人:Gates Corp；
    IPC主号:
    专利说明:

    [0001]
    [0002] POWER TRANSMISSION BELT WITH STRIPED SURFACE
    [0003]
    [0004] BACKGROUND OF THE INVENTION
    [0005]
    [0006] This invention relates generally to power drive belts or drive belts, such as V-belts and multi-V-ribbed belts with a new overlay fabric, more particularly, with a overlay overlay fabric. to stripes and, specifically, with a ribbed covering fabric with alternating stripes of higher and lower density or permeability.
    [0007]
    [0008] Multiple V-ribbed belts or simply V-ribbed belts, also called multi-slot serpentine belts, such as those sold under the trademark Micro-V® by Gates Corporation, are ubiquitous in accessory drives at the front end of the automotive industry as well as in many industrial drive applications. Belts transmit power by friction and are therefore liable to produce noise in conditions that cause skidding. A small degree of slippage is unavoidable, for example, when the belt moves into place when it enters a pulley and by adjusting the belt from a high to low tension condition, or vice versa, on a pulley. Examples of conditions that cause much more slip and noise include insufficient belt tension, too high load demand, wet conditions, pulley misalignment, cold temperatures, to name a few. A simple increase in the coefficient of friction ("COF") between the pulley and the belt grooves can increase the power transmission capacity of the belt, but can be counterproductive in terms of noise by increasing the volume of noise in misalignment conditions or when the strap slips. Belt designers must try to balance such competitive demands, such as increased loads, extreme temperatures, both wet and dry conditions, with the desire for quiet drive belts. Ideally, the balance of properties should be maintained throughout the life of the strap. Similar issues apply to other friction drive belts such as V-belts, flat belts, round belts and the like, and even positive drive belts such as timing belts, they may require the COF of a surface to be controlled.
    [0009]
    [0010] Some methods of changing and controlling the COF of the belt surface involve placing fibers on the surface in the form of fabric and then controlling the type and amount of rubber that is present on the surface. The rubber present on the surface may be a coating or layer that completely covers the surface or the rubber of the body of the strap or a layer of rubber under the fabric may emerge through the fabric towards the surface during a molding step . This rubber surface resulting from outcrop through the fabric is called "penetration". Often COF increases with increased penetration. Rubber and fabric can wear out while using the strap, which can lead to undesirable changes in its noise or friction behavior.
    [0011]
    [0012] There have been several previous efforts to control penetration in order to control COF. For example, US Patent No. USA ContiTech No. 9,709,128 and US Pat. USA Gates No. 9,341,233 describes efforts to control penetration in order to control COF. US patent USA No. 7,749,120 describes efforts to minimize penetration into a power transmission timing belt.
    [0013]
    [0014] SUMMARY OF THE INVENTION
    [0015]
    [0016] The present invention is directed to systems and methods that provide V-ribbed belts or other power transmission belts with a controlled COF, where the belt has a good balance between a relatively high and stable wet COF and dry COF, which It carries good load capacity with low noise emission levels in a range of environmental conditions. The invention is directed to belts with at least one surface having alternate regions or stripes. By "fringed" is meant that there are long narrow bands or alternate elongated regions that exhibit identifiable differences. The stripes do not need to be visually obvious on the strap as they may be hidden by dyes, coatings, rubber penetrations or other dominant effects. The stripes can be alternate regions with different COF characteristics. Alternate stripes can have a relatively higher or lower COF, thus defining an intermediate COF, an average COF for that area.
    [0017] In one embodiment, the invention is directed to a striped grooved overlay fabric and a power transmission belt with the fabric applied to a surface thereof. The stripes can be alternate regions of higher and lower permeability or density (eg, yarn density) or porosity. The stripes may be alternate regions of different fabric or knit constructions that may result in different fabric stretch characteristics, different permeability, or other differences in their properties. In the belt, the striped fabric can give rise to different visually different alternating regions on the surface of a belt. In some embodiments, the stripes may be alternate regions of higher and lower COF. The stripes can be alternate regions with higher and lower rubber penetration from the body of the strap to the surface through the fabric, which may be the result of a difference in permeability or opening of the fabric and which may lead to differences in the COF. The stripes can include one or more of the characteristics or effects mentioned above. The stripes may run transversely across the width of the strap, longitudinally along the length of the strap, or at an angle to the length or width of the strap. The power transmission belt can be a V-ribbed belt, a V-belt, a flat belt, a toothed belt, a round belt, or the like. Striped fabric may be on the contact or working surface of the belt, such as the grooves of a V-ribbed belt or the angled sides of a V-belt or the teeth of a synchronous belt or on the back side of the strap or on all sides of the strap.
    [0018]
    [0019] In a second embodiment, the stripes are due to compositions of different materials that have different friction characteristics.
    [0020]
    [0021] In a third embodiment, the stripes are due to different surface treatments, such as a flocked surface that alternates with a rubbery surface.
    [0022] The invention is also directed to striped fabric for use as a covering fabric in a power transmission belt.
    [0023]
    [0024] The foregoing features and technical advantages of the present invention have been summarized in rather broad terms so that the following detailed description of the invention may be better understood. Next, the additional features and advantages of the invention, which are the subject of the claims of the invention, will be described. Subject matter experts should appreciate that the disclosed concept and specific embodiment can be easily used as a basis for modifying or designing other structures to carry out the same purposes of the present invention. Those skilled in the art should also realize that such equivalent constructions do not deviate from the scope of the invention as set forth in the appended claims. The novel features considered to be features of the invention, both in terms of organization and method of operation, along with other additional objectives and advantages, will be better understood from the following description when considered in connection with the accompanying figures. However, it should be expressly understood that each of the figures is provided for illustrative and descriptive purposes only and is not intended to be a definition of the limits of the present invention.
    [0025]
    [0026] BRIEF DESCRIPTION OF THE FIGURES
    [0027]
    [0028] The accompanying figures, which are incorporated in and form a part of the specification in which like numbers designate like elements, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the invention. In the figures:
    [0029]
    [0030] FIG. 1 is a partially fragmented perspective view of a V-ribbed belt with a fringed ribbed surface in accordance with one embodiment of the invention;
    [0031] FIG. 2 is a partially fragmented perspective view of a banded V-belt with a striped overlay fabric in accordance with one embodiment of the invention;
    [0032] FIG. 3 is a partially fragmented perspective view of a toothed belt with a striped toothed fabric according to an embodiment of the invention;
    [0033] FIG. 4 is a representation of a conventional plain knit fabric;
    [0034] FIG. 5 is a representation of a conventional 1x1 plain knit fabric; FIG. 6 is a representation of a striped knit fabric with plain knit stripes and dropped stitch stripes according to the invention;
    [0035] FIG. 7 is a photograph of a portion of another striped knit fabric with plain knit stripes and dropped stitch stripes in accordance with the invention;
    [0036] FIG. 8 is a photograph of a portion of another striped knit fabric with piqué knit stripes and dropped stitch stripes in accordance with the invention;
    [0037] FIG. 9 is a weaving scheme of a striped woven fabric according to invention;
    [0038] FIG. 10 is a knitting scheme of another strip woven fabric according to the invention;
    [0039] FIG. 11 is a knitting scheme of another strip woven fabric according to the invention;
    [0040] FIG. 12 depicts a configuration of a coefficient of friction (COF) pulley;
    [0041] FIG. 13 depicts a misalignment noise test pulley (RPD) configuration; Y
    [0042] FIG. 14 is a partially fragmented view of a flat belt with a fringed grooved surface in accordance with a third embodiment of the invention.
    [0043]
    [0044] DETAILED DESCRIPTION
    [0045]
    [0046] The invention is directed to a power transmission belt having a stripy surface thereon. By "fringed" is meant that there are alternate elongated bands or regions that exhibit identifiable functional differences. The stripes do not need to be visually obvious on the strap as they may be hidden by dyes, coatings, rubber penetrations or other dominant effects. Fringes can be alternate regions of higher and lower coefficient of friction (COF). Fringes can be the result of a surface covering fabric that may have alternate regions of different fabrics or stitches that can lead to different stretch characteristics, different permeability, different density (eg, yarn density), porosity, or other differences in functional properties. In the belt, the striped fabric may or may not give rise to different visually different alternating regions on the surface of a belt. Preferably, the stripes are alternate regions of higher and lower COF. The stripes may be alternate regions with greater and lesser rubber penetration from the body of the strap to the surface through the fabric, which may be the result of a difference in fabric permeability, density, or opening. The stripes may be compositions of different materials (eg rubber) or alternate flocking and rubber regions. The stripes can include one or more of the characteristics or effects mentioned above. The stripes can run transversely across the width of the strap or across the width of the strap at an angle or parallel to the longitudinal axis of the strap. The stripes can be on the grooves, teeth, sides or on the back of a strap.
    [0047] The stripes of the overlay fabric of the invention do not include effects that merely resemble stripes, but do not impart functional differences in permeability, rubber penetration, yarn density, COF, or the like. For example, single rib stitches, either 1x1, 2x2, 3x3 or the like, produce alternate rib patterns that still have the same basic dot pattern, only inverted. Thus, the alternate grooves at the groove point do not have different values of permeability, density or penetration tendency. Therefore, single rib stitches are not included in the definition of fringe fabrics herein. Similarly, the manufacture of stripes of different colors in an otherwise uniform fabric is not included in the definition of stripes herein. Woven fabrics that alternate regions of different fabrics that have the same density or permeability are also not included in the definition of stripes.
    [0048]
    [0049] The stripes can be characterized by their widths and densities, either manufactured or already installed on a strap. It should be understood that the density once installed is often significantly less than the manufacturing density, as the fabric can be stretched either for application in a belt mold or during molding to conform to a surface profile of the belt, or both. The stripes can also be characterized by the resulting COFs after being applied to the surface of the belt or molded. Another way to characterize stripes is by the degree of rubber penetration into a striped fabric using visual classification.
    [0050]
    [0051] The power transmission belt can be a V-ribbed belt, a V-belt, a flat belt, a toothed belt, a round belt, or the like. The fringes or fringe fabric may be on the contact or working surface of the belt, such as the grooves of a V-ribbed belt or the angled sides of a V-belt or the teeth of a synchronous or face belt back of the strap or on all sides of the strap. Preferably, the belt is a friction drive belt and the fabric is on a contact surface of a pulley. Preferably, the strap is a V-ribbed strap and the striped fabric is preferably over the grooves.
    [0052]
    [0053] FIG. 1 shows the V-ribbed belt 10 with fringed groove overlay fabric 13 over the grooves 12, forming a fringed wear surface 11. The V-ribbed belt 10 also has pull cords 17 embedded in the belt body 19. The rear face 15 may optionally include a fabric, which can be a striped fabric. The light stripes 14 represent stripes of one type and the dark stripes 16 represent stripes of another type. The light stripes 14 may be, for example, fabric stripes of higher yarn density, less permeability or less rubber penetration. The dark stripes 16 may be, for example, fabric stripes of lower yarn density, higher permeability, or greater rubber penetration. Thus, the light stripes 14 can indicate a lower COF than the dark stripes 16 or vice versa.
    [0054]
    [0055] The invention is also directed to other types of belts that have a covering fabric on one surface of the belt. Other types of belts include, without limit, round belts, flat belts, V-belts, and timing belts. The straps can have bands, that is, completely covered with the striping fabric on all sides, as in V-band belts or round belts. The straps can be covered on one or more sides. Multiple layers of covering fabric can be used throughout the strap or on one or more sides of the strap. The stripes can be placed at any angle, including parallel or perpendicular to the longitudinal axis of the strap.
    [0056]
    [0057] FIG. 2 shows the V-belt 20 with a stripy band fabric layer 23 covering all belt surfaces, including the angled side surfaces 21, in contact with the pulley, the rear face 25 of the belt and the face opposite the rear face 25. The V-belt 20 also has pull cords 27 embedded in the body of the belt 29. The light stripes 24 represent stripes of one type and the dark stripes 26 represent stripes of another type. The light stripes 14 may be, for example, fabric stripes of higher yarn density, less permeability or less rubber penetration. The dark stripes 26 may be, for example, fabric stripes of lower yarn density, higher permeability, or greater rubber penetration. Thus, the light stripes 24 can indicate a lower COF than the dark stripes 26.
    [0058]
    [0059] FIG. 3 shows the toothed belt 30 with the fringed toothed covering fabric 33 on the toothed side of the belt, which has teeth 32 alternating with grooves 38. The toothed belt 30 also has pull cords 37 embedded in the body of the strap 39. Back face 35 may optionally include a fabric, which may be a striped fabric. The light stripes 34 represent stripes of one type and the dark stripes 36 represent stripes of another type or characteristic. The light stripes 34 can be, for For example, stripes with higher yarn density, less permeability or less rubber penetration. The dark stripes 36 may be, for example, stripes with lower yarn density, higher permeability, or greater rubber penetration. Thus, the light stripes 14 can indicate a lower COF than the dark stripes 16.
    [0060]
    [0061] In one embodiment of the invention, the fabric is knitted and the stripes are the result of dropping stitches on a regular basis. FIG. 4 shows a basic knit fabric 40, which does not contain stripes. This is a plain weft knit pattern, or single jersey stitch, with continuous threads running horizontally forming rows 42, and loops vertically stretched to form columns 44. FIG. 5 shows another basic stitch pattern without fringes, smooth 1 by 1 stitch 50, where each row 52 is formed by two threads 54 and 56 that alternate, forming a loop of each two, both in the rows and in the columns . The presence of the two wires makes point 1x1 in FIG. 5 is slightly more dense than the smooth point in FIG. 4 and also more resistant to fraying. FIG. 6 shows a striped stitch where the smooth stitch pattern in FIG. 4 has been altered to form stripes of lower density, dropping points. Thus, in FIG. 6, Stripe stitch 60 has higher density streaks 66 alternating with lower density streaks 64. Clearly, drooping stitch sections result in larger pores, lower yarn density, and greater permeability than in stitch sections smooth. Numbers 1 through 8 in FIG. 6 represent knitting needles that could be used to make the stripe fabric 60. Needles 2, 3, 6, and 7 are active and produce smooth stitch stripes 66, while needles 1, 4, 5, and 8 are inactive, resulting in slit stitch stripes 64. Drop points can also be called floating points.
    [0062]
    [0063] FIG. 7 shows a striped fabric 70 where the 1x1 knit pattern of FIG. 5 forms a high-density fringe 76, but the pattern is altered to form a low-density fringe 74 by dropping points. Ten columns form a high density stripe 76. Low density stripe 74 is formed by five repeats of the pattern shown in FIG. 6, namely two smooth columns followed by two columns of dropped dots that are repeated five times. This pattern can give a fringe design of nominal dimensions of approximately 5mm for dense fringes and approximately 10mm for more open fringes, depending, of course, on the size of the thread, how tight the stitch is, and the contraction or stretching before measurement. Clearly, drooping spots result in more pores. large, much lower yarn density and higher permeability than in plain knit sections. The width of the stripes is easily varied by making more or fewer columns in each type of strip. The widths of the stripes in a knitted fabric can be controlled during knitting by the number of active needles in each section and the number of dropped stitches or inactive needles.
    [0064]
    [0065] FIG. 8 shows another striped knit fabric according to an embodiment of the invention based on a pique knit pattern interrupted with columns of floating or dropped stitches. In FIG. 8, strip stitch 80 has high-density strips 86 based on the pique stitch pattern, in this case, 3 columns wide. The piqué knit parts involve an alternation of smooth loops and knitted stitches. The low density stripes 84 again have a width of two columns of dropped dots (or floating dots). In terms of needles, the repeat pattern is 3 needles knitting piqué next to two inactive needles for the floating stitches, which is repeated as many times as necessary. Again, the widths of the stripes can be varied by modifying the number of needles (or columns) making the piqué stitch and the number of needles in the floating sections.
    [0066]
    [0067] In general, any high-density knitting pattern could be used for the densest fringes, with floating dots or dropped points for the least dense fringes. Alternatively, the less dense stripes could simply be an alternate dot pattern of lower density than the denser stripes, for example, with more tucked or longer stitches to open larger pores in the stitch structure. The stitch can be produced with a flat shape (smooth stitch) or with a tubular shape (circular stitch).
    [0068]
    [0069] According to another embodiment, the fabric can be woven to include stripes or regions of different yarn or opening density, analogous to knitted embodiments, but woven with warp and weft yarns. A woven fabric diagram can illustrate such knitting patterns. In the weaving diagrams shown herein, as is customary in the art, the squares represent thread crossings between the warp and weft. A line segment within the square indicates whether the top, or visible, thread at the junction is a warp or weft thread. Vertical line segments indicate that the warp thread is visible or above the weft. The horizontal line segments indicate that the weft is above the warp. Solid lines, which extend along two or more boxes, indicate the lack of a crossing due to the absence of a warp or weft. Empty boxes indicate that neither the warp nor the weft are present. As is conventional, the warp threads run up (vertically) in the diagram, and the weft threads run side to side (horizontally). It should be understood that, for use on a strap, either the warp or weft could be oriented in the longitudinal direction of the strap, or the warp and weft could be positioned at an angle (i.e., bias or at an angle to the bias) on the strap. The warp and weft could be perpendicular or could be changed to a desired non-right angle using methods known in the art.
    [0070]
    [0071] FIG. 9 is a knitting scheme of a striped woven fabric according to the invention. In FIG. 9, fabric 90 includes low density stripes 94 and high density stripes 96. The high density stripes are plain weave. Low density stripes 94 are produced by omitting a number of warp yarns and leaving the weft yarns floating (also known as pass or fill yarns) through the gaps between the high density stripes 96. Again, the Strip widths can be varied by modifying the number of warps in plain weave sections (ie, ends per inch or "EPI", or passes per inch, "PPI") and the number of missing warps in floating sections. In this case, the low-density stripes 94 are much wider than the high-density stripes 96. Therefore, the low-density stripes are not continuously floating, but include periodic pairs of warp yarns to maintain the fabric integrity in floating sections. However, the total yarn density in the more open stripes 94 is less than in the more closely woven stripes 96.
    [0072]
    [0073] FIG. 10 is a knitting scheme of another strip woven fabric according to the invention. In FIG. 10, fabric 100 includes low-density stripes 104 and high-density stripes 106, as in FIG. 9. High-density stripes are smooth fabric. Low density stripes 104 are produced again by omitting a number of warp threads and leaving the weft threads floating. Again, the widths of the fringes can be varied by modifying the warp EPI on the plain weave sections and the number of missing warps on the float sections. FIG. 10 also includes horizontal stripes formed by regular sections 107 with the same pattern as in FIG. 9, and low density horizontal stripes 105 produced by skipping a pair of weft threads and leaving the warps floating through the resulting gaps. This pattern also results in larger pores where the horizontal and vertical stripes of low Density intersect, where neither the weft nor the warp are present. Thus, Scottish or checkered patterns (ie, fabrics with stripes running in both directions) can be included in the definition of "stripes" herein.
    [0074]
    [0075] FIG. 11 is a knitting scheme of another more strip woven fabric according to the invention. In FIG. 11, Fabric 110 includes stripes in both directions with low-density horizontal stripes 115 that are made wider and interspersed with occasional weft threads such as low-density vertical stripes 114 (and similar section 94 in FIG. 9). . The combination of both horizontal and vertical stripes results in four different regions on fabric 110. The intersections of the higher density horizontal stripes 117 and the higher density vertical stripes 116 result in the higher density regions. The intersections of the lower density horizontal stripes 115 and the lower density vertical stripes 114 result in the regions of lower density with the larger pores 112 where there are no warp or weft threads. The intersections of the higher density horizontal stripes 117 and the lower density vertical stripes 114 result in intermediate density regions with vertical stripes. The intersections of the lower density horizontal stripes 115 and the higher density vertical stripes 116 result in intermediate density regions with horizontal stripes. Again, the relative lengths and widths of the regions can be varied by modifying the warp and weft EPI on the denser woven sections and the number of missing warps and wefts on the floating sections. Thus, many varieties of Scottish or checkered patterns (ie, fabrics with stripes running in both directions) can be included in the definition of "stripes" in this document.
    [0076]
    [0077] Therefore, the fringe fabrics of the invention include alternate regions of different density, permeability, or aperture, especially rubber that is located just below the fabric and which may be prone to flow during pressure belt cure. Different amounts of opening can be obtained by varying the style or structure of fabric or knitting in different regions. For example, in a knit fabric a low permeability stripe can be obtained by a plain knit construction and a higher permeability stripe can be obtained by altering the knit construction, for example, to include tuck stitches or floats. (floating) or dropping points. In a woven fabric, based on a conventional fabric, be it a plain square fabric or twill or other regular fabric, stripes can be obtained with greater permeability by dropping or omitting certain warp and / or weft threads.
    [0078]
    [0079] US Patent Publication. USA No. 2010/0167860 A1 and US Patent Publication. USA No. 2010/0173740 A1, the entire contents of which are incorporated herein by reference, describe useful materials and methods for V-ribbed fabrics and belts in accordance with the present invention. For a V-ribbed belt that includes a ribbed surface covered with a fabric, the fabric is preferably stretchable in two predetermined directions. The fabric materials can be selected to provide sufficient elasticity. Furthermore, the material can be selected so as to provide sufficient durability to the belt taking into account the required performance of the wear surface (for example, in terms of wear resistance, heat resistance, coefficient of friction stability, water resistance and slip and noise properties).
    [0080]
    [0081] For example, the fabric material may include an elastic yarn or fiber that includes polyurethane and at least one type of non-elastic yarn or fiber that includes a cellulose-based or non-cellulose-based yarn or fiber, or a mixture thereof. The mixture of cellulose-based yarn or fiber and non-cellulose-based yarn or fiber is made either by mixing two types of fibers into a spun or twisted or wound yarn or by feeding different types of yarns together during the process of fabric manufacturing, either by knitting or weaving. Elastic threads help retain the required degree of stretch, which could otherwise be reduced by introducing floating stitches or other modifications to the knit or fabric.
    [0082]
    [0083] Cellulose-based yarn or fiber may include: natural fiber such as cotton, linen, jute, hemp, flax, abaca, and bamboo; artificial fibers like rayon and acetate; and combinations thereof. Cotton is the preferred cellulose-based yarn.
    [0084]
    [0085] Non-cellulose-based yarns or fibers include polyamide, polyester, polyethylene naphthalate, acrylic, aramid, polyolefin, polyvinyl alcohol, liquid crystal, polyether-ether ketone, polyimides, polyketone, PTFE, e-PTFE, PPS, PBO , wool, silk and combinations thereof.
    [0086]
    [0087] For best wet performance, the fabric may include a two strands including a first strand that is elastic, such as polyurethane, and a second strand of cellulose, such as cotton. In addition, a three or more yarn construction can be used that includes an elastic yarn or fiber, a cellulose yarn or fiber, and other yarns. A third thread can be selected based on the desired wear resistance.
    [0088]
    [0089] Preferably, the first yarn is an elastic yarn such as polyurethane, which gives the fabric a high level of elasticity. The second and third yarn or fibers could consist of a mixture of two different types of yarn or fibers, which may be combinations of yarn or cellulose fiber and yarn or fiber without cellulose, mixed in different proportions. One type is a cellulose-free yarn or fiber, which provides wear resistance or durability. The other type is cellulose yarn or fibers, which will provide superior wet performance. In some applications, the cellulose yarn or fiber alone can provide adequate durability and wet performance.
    [0090]
    [0091] The mixing ratio of cellulose-based yarn or fiber and non-cellulose-based yarn or fiber can range from 100: 0 to 0: 100. A proportion of cellulose-based yarn or fiber of 5% to 100% and non-cellulose yarn or fiber of 0% to 95% is preferable. Furthermore, the ratio of the elastic yarn or fiber to the non-elastic yarn or fiber can be from 2% to 40%.
    [0092]
    [0093] One method of manufacturing a V-ribbed belt may include placing a belt matrix (including the belt body and pull cord materials) around a mandrel, placing the fabric of the invention around the outer circumference of the strap die, which wraps around the mandrel, place the mandrel inside a casing having a plurality of grooves along its inner circumference, expand the belt die and fabric to the inner circumference of the casing and thus press the fabric against the inner circumference with the structure of multiple grooves, and cure the matrix of the strap with the fabric. The fabric stretches to conform to the multi-rib structure and expanded circumference.
    [0094]
    [0095] Any known method can be used to manufacture the various types of belts using the fringe fabrics of the invention. The methods of making belts in which strip fabrics can be used are not limited.
    [0096] A 3D FEA (three-dimensional finite element analysis) model was created to theoretically investigate the effect of stripes with different COFs on belt noise. The FEA model was simplified to model a groove in a belt, when it slides radially into a groove in the pulley in a misaligned condition. The model reproduced a slip-adhesion phenomenon and calculated the stored strain energy before releasing the "adhesion" and the groove "skidded" down into the groove. The high-energy state just before skating could be associated with noise: the higher the energy, the greater the noise that could be emitted when skating. The model was run for different fringe widths and the strain energy in skating was compared to equivalent fringeless models with the same average COF. The evaluation results are shown in TABLE 1. The units of the deformation energy are N-mm, but the deformation energy of TABLE 1 can be considered as a relative classification, since the model is not at the same scale than a real strap. The results indicate that stripes with two different coefficients of friction have the potential to significantly reduce noise-releasing strain energy in a friction drive belt relative to a fringeless surface with the same average COF. The width of the stripes appears to have little effect on the amount of improvement potential. The narrower stripes appear to be directionally better than the wider stripes, but the differences are not as great. Therefore, the 1mm stripes have the highest percentage of deformation energy reduction, followed by the 2mm stripes, but the 3mm stripes and 10mm stripes are comparable to each other.
    [0097]
    [0098] The invention was also demonstrated in real belts subject to COF tests and misalignment noise (RPD) tests.
    [0099]
    [0100] The COF test was performed according to the SAE J2432-MAR2015 § 10 specifications, on an arrangement as shown in FIG. 12. Referring to FIG.
    [0101] 12, the driven pulley 122 and the driven pulley 121 of the test both have a multiple V-groove profile and a diameter of 121.6 mm. Pulleys 123, 124 and 126 are free. The pulleys are positioned to maintain a wrap angle of 20 degrees on the driven pulley 122. The drive pulley 121 is rotated at 400 rpm. A weight W of 360 N is applied to the pulley 125 to provide a slack side tension of 180 N on the pulley 125. A torque is applied to the test pulley 122, gradually increasing the torque from zero until the pulley stops rotating. The COF is calculated from the maximum torque observed. It should be understood that the test measures an effective coefficient of friction on the belt, which does not coincide numerically with the theoretical coefficients of friction used in the previous FEA model. The wet COF test is performed by spraying water at a rate of 300 ml / minute on the belt between pulleys 121 and 122, increasing the wrap angle to 45 ° on the driven pulley 122 and rotating the drive pulley from 121 to 800 rpm.
    [0102]
    [0103] The misalignment noise test (RPD) was performed according to SAE J2432-MAR2015 § 9 specifications, on a four-point drive as shown schematically in FIG. 13. With reference to FIG. 13, pulleys 131, 132, and 133 have multiple V-groove profiles and diameters of 101mm, 61mm, and 140mm, respectively. Pulley 131 is the drive, rotating at 1000 rpm clockwise. Pulley 134 is a free pulley with a diameter of 50 mm. The pulley 133 can be moved perpendicular to the plane of the arrangement, producing a misalignment angle. A tension of approximately 267 N was applied to the test belt by means of a dead weight on the tensioning pulley 132. Then, the pulley 133 deviated a certain amount and the noise was measured with an M microphone. The RPD test with humidity 90% includes a water spray nozzle 136. The belts were tested new and after conditioning to SAE J2432-MAR2015 specifications. The noise results were presented in units of decibels (dB). Background noise measured with a quiet strap is in a range of 79-82 dB. The straps whose tests gave above about 85 dB are quite noisy.
    [0104]
    [0105] A series of three V-ribbed belts was constructed to illustrate the advantages of the fringed belts of the invention over conventional belts with uniform friction surfaces. The constructions of the belts only differed in the fabric that covered the grooves. Compared Straps A and B ("Comp.") Had a standard 1x1 ribbed knit fabric as illustrated in FIG. 5. For Belt A, the fabric was applied in the mold with a relatively small stretch, corresponding to a relatively high standard yarn density, resulting in a mainly fiber grooved surface giving a relatively low dry COF of 0.73 and low noise generation in two of the most severe test conditions for misalignment noise (2 ° pulley misalignment at low temperatures and high humidity). Although Strap A runs quietly, there are applications that require a higher COF.
    [0106]
    [0107] For Belt B Comp., The fabric was applied in the mold with a somewhat higher level of stretch, corresponding to a thread density of approximately 30% less, which resulted in a greater penetration of rubber on the surface of the groove and a higher dry COF of 1.59, as desired for some applications. However, Belt B performed with a lot of noise under both misalignment test conditions. It should be noted that the wet COF is lower than for Belt A Comp., Which is typical of more rubbery surfaces, but the results of the wet test are still noisier for Belt B, which is the one with the highest rubber penetration. .
    [0108]
    [0109] The inventive belt of Ex. 1 uses the striped fabric shown in FIG. 7, with an overall yarn density similar to that of Strap B Comp., But resulting in grooves with high and low penetration stripes and an average dry COF of 1.54, close to the highest desired COF as in Strap B Comp. However, the wet COF of the inventive belt from Ex. 1 is now higher again, closer to the value of Belt A Comp. The inventive belt of Ex. 1 also works quietly under the two misalignment test conditions, although the average COF, whether dry or wet, is very similar to that of the noisy Belt B. This confirms the previous model's prediction that the Striped belts generate less noise than uniform belts with the same average COF.
    [0110] TABLE 1.
    [0111] COF Pattern Energy Energy% Reduction of stripes1 average Deformation Deformation Energy of Stripes COF Constant Deformation Only L 0.3 - 0.23 --5H 10L 0.4 0.28 0.32 -13%
    [0112] 1H 1L 0.45 0.13 0.42 -69%
    [0113] 2H 2L 0.45 0.2 0.42 -52%
    [0114] 3H 3L 0.45 0.26 0.42 -38%
    [0115] 4H 4L 0.45 0.25 0.42 -40%
    [0116] 5H 5L 0.45 0.29 0.42 -31%
    [0117] 10H 10L 0.45 0.26 0.42 -38%
    [0118] 10H 5L 0.5 0.29 0.49 -41%
    [0119] H only 0.6 - 0.76 --1 L = Low COF strip, width in mm; H = strip of high COF, width in mm.
    [0120] TABLE 2.
    [0121]
    [0122] 2.0 ° Density Noise Misalignment Belt Relative Fabric COF COF -20 ° C 5 ° C Point Number of Dry Thread Wet Dry 90% RH Standard point density 0.73 1.08 79 dB 79 dB 1x1;
    [0123] Standard Comp.
    [0124] high point
    [0125] density
    [0126] Standard point ~ 30% 1.59 0.95 98 91 1x1;
    [0127] Comp.B less
    [0128] low density point
    [0129] density
    [0130] 2.0 ° Density Noise Misalignment Relative Fabric Strap COF COF
    [0131] Thread Point Dry Wet -20 ° C 5 ° C Dry # 90% RH
    [0132] Stripes: 5mm ~ 30% 1.54 1.01 81 80 height x less
    [0133] Ex. 1 10 mm low density
    [0134] density1
    [0135] 1 i.e. 5mm low COF strips 10mm high COF due to rubber penetration.
    [0136]
    [0137] Summarizing, the inventors have discovered that fringe fabric belts with different yarn density and different levels of rubber penetration can present the favorable aspects of both stripes, that is, a favorable combination of the properties that would be expected for each type of strip, without the negative aspects that would be expected from the two types of stripes. Therefore, Belt C exhibits the expected high dry COF for a rubbery surface, but also the highest expected wet COF for a fiber surface, but without the expected noise generation in a dry test of a conventional belt with a Higher COF and without the expected noise in a rubber strap in a wet test.
    [0138]
    [0139] Additional examples of V-ribbed fabrics and belts are listed in TABLE 3 to show that there is a wide range of strip to fabric constructions useful for manufacturing power transmission belts. Relatively narrow stripes are shown from Ex. 2 to Ex. 6, as in the previous models. The dot construction of Ex. 2 is similar to the illustration in FIG. 6. The point construction of Ex. 3 is like that of FIG. 6, but with 3 needles inactive in the sections of dropped stitches instead of just 2. The stitch in Ex. 4-6 is illustrated in FIG. 8. The points in Ex. 9-14 are the same as in Ex. 1 above. The points in Ex. 7 and 8 are similar to Ex.
    [0140] 1, but with different strip widths, as indicated in TABLE 3.
    [0141]
    [0142] TABLE 3 also shows how the amount of stretch applied to the fabric when the belt plate is built into the mold can affect rubber penetration as indicated by the COF. As the amount of stretch increases, the density of the fabric decreases and the fabric becomes more open or permeable to rubber penetration. As penetration permeability increases, COF increases resulting from the strap. Comparing the noise results for Ex. 9-14, it appears that the tightly stretched fabric may eventually result in such a high COF that the web becomes noisy. Comparison of Ex. 4 with Ex. 9 suggests that thinner stripes can produce less noise than thicker stripes, as predicted by the previous FEA model.
    [0143] TABLE 3.
    [0144] 2.0 ° Stretch Fabric Strap Noise Misalignment
    [0145] Ex. To Bands in COF COF -20 ° C 5 ° C No. of mold point Dry Wet dry 90% RH 2 2 smooth x 2 ms1 83% 1.3 1.04 80 dB 79 dB 3 2 smooth x 3 ms 108% 1.6 1.01 81 79
    [0146] 4 3 pique x 2 ms 142% 1.78 0.92 82 78
    [0147] 5 it 100% 1.62 1.07 80 79
    [0148] 6 it 85% 1.47 1.06 78 79
    [0149] 7 5 mm x 5 mm2 115% 1.41 1.0 79 79
    [0150] 8 10 mm x 10 mm 138% 1.45 1.01 79 79
    [0151] 9 5 mm x 10 mm 183% 1.74 0.89 87 93
    [0152] 10 it 146% 1.62 0.95 81 82
    [0153] 11 it 138% 1.53 0.94 80 79
    [0154] 12 it 112% 1.49 0.98 80 79
    [0155] 13 it 98% 1.26 1.02 79 76
    [0156] 14 it 76% 1.27 1.05 79 79
    [0157] 1 "ms" = point lost or dropped.
    [0158] 2 width of each strip in mm, first the width of the high density strip and second the given width of the lowest density strip.
    [0159]
    [0160] According to the second embodiment (or group of embodiments) of the invention, stripes with different COFs are obtained by alternating two different rubber compositions on the surface of the strap. For example, one composition may include a friction modifier that gives it a lower COF than the other composition. Any suitable process can be used to obtain the stripes. The two rubber compositions can be extruded or calendered together to provide a stripy rubber sheet which is then applied to the belt mold or constructed of other belt materials. As an alternative, in another example, a first rubber material with a first COF can be formed into sheet form and a second rubber material with a second COF can be applied to it in stripes by a coating process, a process of extrusion or a printing process. The two rubber compositions can be applied in stripes on a carrier fabric, which can be woven, knitted or non-woven, and can be included in the construction of the strap. The rubber stripes can be applied on a carrier film and transferred to the strap or mold.
    [0161]
    [0162] Suitable friction modifiers to lower the COF of a rubber composition include, without limitation, fluoropolymers such as TFE, PTFE, FEP, and the like, molybdenum compounds, graphite materials, silicone materials, flower oils, and the like. Friction modifiers can be in the form of a powder, liquid or fiber. The fibers can be used in either low COF rubber or high COF rubber. Cotton or other cellulosic fiber can be particularly useful in one or both rubbers. One of the two stripe rubbers could have the same composition as the strap body. The body of the strap can be either high or low COF rubber with the other rubber composition then added in a striped pattern.
    [0163]
    [0164] The stripes can be applied in a spiral pattern over a strap or mandrel mold. Alternatively, a fringe pattern can be applied to a surface of a finished belt by a suitable printing, coating or extrusion process.
    [0165]
    [0166] The stripes indicated in FIGS. 1-3 could be rubber stripes according to this second embodiment.
    [0167]
    [0168] According to a third embodiment (or group of embodiments) of the invention, stripes with different COFs can be obtained by alternating a rubber, fabric or rubberized fabric composition with a flocked strip. "Flock" refers to the application of short fibers on a surface of a belt and the resulting surface arrangement of the fibers. US patent USA No. 6,561,937 and US Patent No. USA No. 3,190,137 describe various known methods and materials for producing uniform flocked surfaces and are incorporated herein by reference. Any of the methods disclosed herein could be adapted to generate flocked stripes or flock stripes on a surface of the belt in accordance with the present invention. Depending on the choice of an adhesive, the underlying fabric or the rubber surface, i.e. depending on the alternation of the stripes and the choice of flocking materials, the flocked stripes could have a higher or lower COF. than alternate regions. The flocking of a striped pattern on the rubber surface can be applied before or after molding the strap. Any suitable fiber, adhesive, and flocking process can be used to deposit and adhere fibers or flocking on the surface of a belt. For example, flocking could be applied by mechanical methods, blowing methods, electrostatic processes, or combinations thereof. Useful fibers include cellulose materials, such as cotton, rayon, linen, kenaf, or the like, synthetics such as nylon, aramid, polyester, and the like, or carbon, glass, or other inorganic fibers or combinations thereof.
    [0169]
    [0170] FIG. 14 shows an exemplary strap 140 with flocked stripes 142 alternating with gummy stripes 144.
    [0171]
    [0172] Fringes with different COFs could also be introduced to the surface of the belt by 3D printing or inkjet printing, by extrusion, dipping, spraying, friction, defoaming, or combinations thereof or other means to create stripes with two values. COF. This could be done on a sheet of backing material which is then applied to the mold. The backing material could be removed (a label transfer process), or the backing material could be included in the strap, in which case the backing material could be one of the COF materials. Alternatively, the stripes could be applied to a belt body directly after molding or before molding. If applied after molding, the strap could have a cut or ground strap profile to which the stripes are applied. The stripes could end at any desired angle on the surface of the strap. The materials could be applied as a foil at a belt construction stage or they could be spiral shaped as a fringe at a desired angle.
    [0173]
    [0174] Although the present invention and its advantages have been described in detail, it should be understood that various changes, substitutions, and alterations can be made herein without departing from the scope of the invention as defined in the appended claims. Furthermore, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacturing, composition of matter, means, methods, and steps described in the specification. As one skilled in the art will readily appreciate from the disclosure of the present invention, according to the present invention, processes, machines, manufacturing, compositions of matter, media, methods or steps, may be used, Currently existing or subsequently developed that perform substantially the same function or obtain substantially the same result as the corresponding embodiments described herein. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacturing, compositions of matter, media, methods, or steps. The invention disclosed herein can be suitably practiced in the absence of any element not specifically disclosed herein.
    权利要求:
    Claims (17)
    [1]
    1. A power transmission belt comprising a surface comprising stripes defined as two or more alternate regions with different coefficient of friction.
    [2]
    2. The strap of claim 1, wherein the stripes are alternate regions with different rubber compositions.
    [3]
    3. The strap of claim 1, wherein the stripes include flocked regions alternating with rubber regions.
    [4]
    4. The strap of claim 1, wherein the surface comprises a reinforcing fabric and said stripes correspond to two or more alternate regions of different knitting or knitting patterns on said fabric.
    [5]
    5. A power transmission belt comprising a fabric reinforcement comprising stripes defined as two or more alternate regions with different knit or knit patterns.
    [6]
    The power transmission belt of claim 5, wherein the two or more alternating regions are arranged on a surface in contact with a pulley of the power transmission belt and have different coefficients of friction against a corresponding surface of the pulley.
    [7]
    7. The power transmission belt of claim 5, wherein the two or more alternate regions on the contact surface have different levels of rubber penetration.
    [8]
    8. The power transmission belt of claim 5, wherein the two or more alternate regions also have different surface densities.
    [9]
    9. The power transmission belt of claim 8, wherein the strip with the lowest surface density comprises floating points.
    [10]
    10. The power transmission belt of claim 5, wherein the fabric it is knitted and one of the different knitted patterns comprises one or more columns of dropped stitches.
    [11]
    11. The power transmission belt of claim 5, wherein the fabric is woven and one of the different knitting patterns comprises one or more missing warp or weft threads.
    [12]
    12. The power transmission belt of claim 5 in the form of a V-ribbed belt comprising a plurality of ribs with the fabric disposed over the ribs.
    [13]
    13. A woven or knit fabric to reinforce a power transmission belt comprising stripes defined as two or more alternate regions with different knit or knit patterns.
    [14]
    14. The fabric of claim 13, wherein the fabric is knit and one of the different knit patterns comprises one or more dropped stitch columns.
    [15]
    15. The fabric of claim 13, wherein the fabric is woven and one of the different knitting patterns comprises one or more missing warp or weft yarns.
    [16]
    16. The fabric of claim 13, wherein the two or more alternate regions also have different surface densities.
    [17]
    17. The fabric of claim 16, wherein the stripe with the lowest surface density comprises floating points.
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    同族专利:
    公开号 | 公开日
    CN114127439A|2022-03-01|
    KR20220016190A|2022-02-08|
    ES2748214B2|2022-02-01|
    WO2020252410A1|2020-12-17|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2001034998A1|1999-11-12|2001-05-17|The Gates Corporation|Power transmission belt using stabilized open mesh textile material in overcord for enhanced rubber penetration|
    EP1510726A2|2003-08-25|2005-03-02|Bando Chemical Industries, Ltd.|Friction drive belt and method for fabricating the same|
    US20110269588A1|2008-11-18|2011-11-03|Andreas Fleck|Article, particularly drive belt, having a textile layer and method for producing a drive belt|
    DE102012101401A1|2012-02-22|2013-08-22|Contitech Antriebssysteme Gmbh|Drive element e.g. rib belt for frictional transmission of drive force to experiment drum in chemical research field, has drive unit with zones having different coefficients of friction over effective length in driving direction|
    US3190137A|1958-10-28|1965-06-22|Raybestos Manhattan Inc|Rubber faced belt with fiber traction surface|
    CA2313421A1|1999-08-26|2001-02-26|The Goodyear Tire & Rubber Company|Power transmission belt|
    US7749120B2|2006-11-03|2010-07-06|Dayco Products, Llc|Power transmission belt|
    JP5337795B2|2007-09-14|2013-11-06|ゲイツ・ユニッタ・アジア株式会社|V-ribbed belt|
    JP5981330B2|2012-03-08|2016-08-31|三ツ星ベルト株式会社|V-ribbed belt|
    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201930541A|ES2748214B2|2019-06-13|2019-06-13|POWER TRANSMISSION BELT WITH STRIPED SURFACE AND A STRIPED COVERING FABRIC.|ES201930541A| ES2748214B2|2019-06-13|2019-06-13|POWER TRANSMISSION BELT WITH STRIPED SURFACE AND A STRIPED COVERING FABRIC.|
    KR1020217043065A| KR20220016190A|2019-06-13|2020-06-12|Power transmission belt with striped surface and striped cover fabric|
    CN202080051913.XA| CN114127439A|2019-06-13|2020-06-12|Transmission belt with striated surface and striated cover fabric|
    PCT/US2020/037633| WO2020252410A1|2019-06-13|2020-06-12|Power transmission belt with striped surface and a striped cover fabric|
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