• 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:
    The invention relates to a screw drive (1; 12; 17; 24) having a threaded element (6), at least one planet and a support (8; 30), the at least one planet being supported by the support (8; 30) along the threads of the thread (6) of the element rolls and the holder (8; 30) moves linearly along the thread (6) of the element relative to the element. The at least one planet of the screw drive (1; 12; 17; 24) is formed by a bearing (2; 18; 25) connected to its outer ring (3; 27) or its inner ring (4; 20; Angle portion (11; 21; 31) engages the thread (6) of the element.
    公开号:AT517943A4
    申请号:T50876/2015
    申请日:2015-10-15
    公开日:2017-06-15
    发明作者:
    申请人:Rene Semmelrath；
    IPC主号:
    专利说明:

    Screw drive with at least one bearing as a planet
    The invention relates to a screw with a threaded element, at least one planet and a holder, wherein the at least one planet from the holder held along the threads of the thread of the element unrolls and moves the holder linearly along the thread of the element relative to the element.
    The person skilled in the art is familiar with roller screw drives in which rollers located around a threaded spindle in a cage roll on the thread of a threaded spindle. The rollers have a thread fitted to the threads of the threaded spindle and are axially supported in the cage forming a support. The rollers thus form planets which revolve around the threaded spindle, whereby the holder is transported linearly along the threaded spindle.
    The person skilled in ball screws are further known in which balls are held by a holder around the threaded spindle in the recesses of the thread of a threaded spindle. The holder further has a ball return, with which, depending on the linear transport direction of the holder, the balls in the direction of the transport direction are returned from the back again forward into the recesses of the thread. The balls thus form planets that revolve around the threaded spindle, whereby the holder is transported linearly along the threaded spindle.
    In these two known screw drives has proved to be a disadvantage that the balls and rollers roll directly into the thread of the threaded spindle, which is why both the thread of the threaded spindle and the thread in the rollers must be made very accurate and wear. This causes screw drives to be relatively expensive compared to other linear drives. In practice, it has also been found that contamination of the threaded spindle leads to a hooking linear transport of the holder or even can lead to a blockage of the entire screw drive.
    The invention has for its object to provide a screw which can be made structurally simple and inexpensive and still has a long life.
    According to the invention, this task is solved in that the at least one planet is formed by a bearing which engages with its outer ring or with its inner ring via an angular portion in the thread of the element.
    As a result, the advantage is obtained that the actual rolling or rolling process does not take place in the thread of the element, but in the camps. As a result, so inexpensive available and long life bearing can be used. Although the webs and grooves of the inner rings or the outer rings of the bearings also run in the thread of the element to effect the linear propulsion, but the actual unwinding takes place in the camps.
    As an element in this context, especially a threaded spindle or an internal thread exhibiting hollow cylinder is seen.
    According to the invention, three fundamentally different variants are to be distinguished. The one in which the outer rings of the bearings engage in the thread of a threaded spindle. Although this first embodiment is the size of the bracket or the scope of the entire screw slightly larger, but the planet together with the planet holding together bracket can be built very short, which is why the threaded spindle must be only slightly longer than the holder linearly transportable transport path.
    In the second embodiment, the inner rings engage in the thread of a threaded spindle, wherein the curvature of the inner rings conforms to the curvature of the threaded spindle. As a result, the diameter of the bearings or the diameter of the holder holding together the at least two bearings has an only slightly larger diameter than the threaded spindle, which is particularly advantageous in certain applications. Furthermore, this results in that the grooves or webs of the inner rings of the bearing engage over a relatively large angle section in the thread of the threaded spindle and thus can absorb relatively large carrying forces in the transport direction or against the transport direction.
    In the third embodiment, the outer rings engage in the thread of a hollow cylinder provided with an internal thread, wherein the curvature of the outer rings conforms to the curvature of the hollow cylinder. Due to the arrangement of the bearings in the hollow cylinder, the outer diameter of the hollow cylinder forms the widest point of the screw drive. Furthermore, results in this embodiment, as in the second
    Variant in that the grooves or webs of the outer rings of the bearing engage over a relatively large angle section in the thread of the hollow cylinder and thus can absorb relatively large carrying forces in the transport direction or against the transport direction.
    Further advantageous embodiments of the screw drive according to the invention are explained in more detail below with reference to FIGS.
    Figure 1 shows a side view of a screw drive with three ball bearings, which engage with their outer rings in the thread of a threaded spindle.
    FIG. 2 shows a plan view of the screw drive according to FIG. 1.
    Figure 3 shows a sectional view of a side view of a screw drive with two groups of two ball bearings per group, the four ball bearings engage with their outer rings in the thread of the threaded spindle.
    Figure 4 shows a sectional view of a side view of a screw drive with two ball bearings, which engage with their inner rings in the thread of the threaded spindle. FIG. 5 shows a plan view of the screw drive according to FIG. 4.
    Figure 6 shows a sectional view of a side view of a screw with two ball bearings, which engage with their outer rings in the internal thread of a hollow cylinder.
    FIG. 7 shows a plan view of the screw drive according to FIG. 6.
    Figure 1 shows a side view of a screw 1 with three ball bearings 2, each having an outer ring 3, an inner ring 4 and arranged between the outer ring 3 and the inner ring 4 balls 5. The ball bearings 2 engage with their outer rings 3 in the thread 6 of a threaded spindle 7 a. The three ball bearings 2 each form a planet and are held together by a holder 8 shown symbolically in FIG. The outer rings 3 of the ball bearing 2 have webs 10, which are adapted to the thread 6 of the threaded spindle 7 and roll in this. Since the curvatures of the thread 6 of the threaded spindle 7 and of the web 10 of the outer ring 3 are oriented differently, the outer ring 3 only engages in the thread 6 over a relatively short angle section 11.
    Figure 2 shows the screw drive 1 from above, wherein two of the three ball bearings 2 are held at an angle of about 100 degrees to each other and each secured at an angle of 130 degrees to the third ball bearing 2 in the holder 8. Depending on the application of the screw drive 1, an asymmetrical arrangement of the three ball bearings 2 in order to allow in a preferred direction more carrying capacity (transverse to the longitudinal axis 15 of the threaded rod 7), or a symmetrical arrangement of the ball bearings 2 offset by 120 degrees may be advantageous.
    FIG. 3 shows a sectional drawing of a side view of a screw drive 12 according to a further exemplary embodiment of the invention. The screw 12 has two groups 13 of two ball bearings 2 per group 13, wherein the four ball bearings 2 engage with their outer rings 3 in the thread 6 of a threaded spindle 7. In this embodiment of the invention, each group 13 of two ball bearings 2 forms a planet, wherein the two ball bearings 2 of a group 13 are connected by a bearing holder 14 with its inner rings 4. The ball bearings 2 of the two groups 13 engage with their outer rings 3 offset by about 180 degrees in the thread 6 of the threaded spindle 7 a. The bearing holder 14 form parts of the holder, not shown, and are connected via this.
    The two axes 23 of the ball bearings 2 of a group 13 are tilted relative to one another in the bearing holder 14, whereby a better guidance of the webs 10 in the thread 6 of the threaded spindle 7 is given. In addition, there is a better initiation of the carrying capacity of the holder in the threaded spindle. 7
    The one bearing holder 14 now has a web 16 and the other bearing holder 14 has a groove 22, with which they engage in the thread 6 of the threaded spindle 7. As a result, a better guidance of the holder in the linear movement of the holder or the threaded spindle 7 along a transport direction 9 is given.
    As can be seen from the two embodiments of the screw drives 1 and 12 with webs 10 in the outer rings 3 of Figures 1 to 3, the ball bearings 2 holding together holders 8 can be built very short, which is why the threaded spindle 7 must be only slightly longer than the parallel to the longitudinal axis 15 of the threaded spindle 7 lying transport path. As a result, the advantage is obtained that with a limited length of the threaded spindle 7, a particularly long transport path or adjustment of the holder or the threaded spindle 7 is possible.
    Figure 4 shows a sectional view of a side view of a screw 17 according to another embodiment of the invention with two ball bearings 18 which engage with their webs 19 of the inner rings 20 in the thread 6 of the threaded spindle 7 a. In this embodiment of the invention, the ball bearings 18 each form planets, which are offset by their inner rings 20 each offset by about 180 degrees in a holder, not shown, engage in the thread 6 of the threaded spindle 7.
    Since the curvatures of the thread 6 of the threaded spindle 7 and the webs 19 of the inner ring 20 are the same orientation, the inner ring 20 engages in the thread 6 via a relatively large angle section 21 shown in FIG. As a result, a very good power transmission and leadership of the holder is given. Furthermore, the advantage is obtained that the two ball bearings 18, and thus also the entire holder, cling to the threaded spindle 7, which is why the diameter of the holder is not much larger than the diameter of the threaded spindle 7. This thin design of the screw 17 allows its use in areas where the space is limited, such as lathes.
    The axes of the ball bearings 18 are tilted to the longitudinal axis 15 of the threaded spindle 7, which can be seen in Figure 4, that from one ball bearing 18, the top and from the other ball bearing 18 is the bottom. The ball bearings 18 are tilted about the pitch of the thread 6 of the threaded spindle 7 in the holder. As a result, a particularly uniform running of the webs 19 in the thread 6 is achieved.
    In all three above-mentioned embodiments of the screw drives 1, 12 and 17, there is the possibility that either the holder, which is characterized in the embodiment of the screw 1 with the item number 4 and in the embodiments of the screw 12 and 17 is not shown, is fixed against rotation and the threaded spindle 7 is rotatable or that the threaded spindle 7 is fixed against rotation and the holder is rotatable. In both ways, regardless of whether the threaded spindle 7 is fixed against rotation or the holder is fixed against rotation, either the threaded spindle 7 can be fixed axially and the holder along the transport direction 9 be movable or the holder can be axially fixed and the threaded spindle 7 along the transport direction be movable.
    Figure 6 shows a sectional view of a side view of a screw 24 according to another embodiment of the invention with two ball bearings 25, with their
    Webs 26 of the outer rings 27 engage in the internal thread 28 of a hollow cylinder 29.
    In this embodiment of the invention, the ball bearings 25 form planets, which are offset by their inner rings 33 by about 180 degrees offset on the holder 30 into the internal thread 28 of the hollow cylinder 29 engage.
    Since the curvatures of the internal thread 28 of the hollow cylinder 29 and the webs 26 of the outer ring 27 are the same orientation, the outer ring 27 engages in the internal thread 28 via a relatively large angle section 31 shown in FIG. As a result, a very good power transmission and leadership of the holder 30 is given.
    The ball bearings 27 are tilted to the slope 30 of the internal thread 28 of the hollow cylinder 29 fixed to the holder 30. As a result, a particularly uniform Fauf of the webs 26 is achieved in the internal thread 28.
    As can be seen from the embodiment of the screw 24 with webs 26 in the outer rings 27 of Figures 6 to 7, the ball bearing 25 holding together bracket 30 can be built very short, which is why the hollow cylinder 29 must be only slightly longer than the parallel to the catch axis 32nd the hollow cylinder 29 lying transport path. This has the advantage that with limited catches of the hollow cylinder 29, a particularly long transport path or adjustment of the holder 30 and the hollow cylinder 29 is possible. The holder 30 is held by a cylinder 35 which protrudes from one end of the hollow cylinder 35. Advantageously, the cylinder 35 is designed as kink-resistant as possible. To increase the rigidity, it is also possible to use two cylinders 35 for holding the holder 30, wherein in each case one cylinder 35 is led out of one end of the hollow cylinder 35 in each case. Due to the design thus very high forces can be transmitted because on the one hand, the overlap of the outer rings 27 Fangs in the thread 28 is very large and on the other hand, the screw 24 has greater security against kinking against a threaded spindle due to the larger diameter. By this design further has the advantage that the internal thread 28 of the hollow cylinder 29 is better protected against contamination with threads of a threaded spindle and with closed ends of the hollow cylinder 29 of the screw 24 can also be used in environments that pollute quickly and heavily, such as For example, in drives in milling machines that lay with chips.
    As in the aforementioned embodiments, in this embodiment of the screw drive 24 there is the possibility that either the holder 30 is fixed against rotation and the hollow cylinder 29 is rotatable or that the hollow cylinder 29 is fixed against rotation and the holder 30 is rotatable. In both options, regardless of whether the hollow cylinder 29 is fixed against rotation or the holder 30 is fixed against rotation, either the hollow cylinder 29 may be axially fixed and the holder 30 along a transport direction 34 be movable or the holder 30 axially fixed and the hollow cylinder 29 along the transport direction 34 can be moved.
    It may be mentioned that different types of bearings can be used in the screw drives according to the invention, such as different types and shapes of rolling and / or plain bearings. Rolling bearings of the following type are particularly advantageous: ball bearings; Cone bearing; Roller bearings.
    It can be mentioned that screw drives according to the invention can have two, three, four or even more bearings in a common holder. A larger number of bearings allows a greater load capacity of the screw drive. Furthermore, it would be possible to connect a holder held by at least two bearings to a further holder held by at least two bearings on the same threaded spindle in order to achieve a broader support and to increase the buckling stability.
    It may be mentioned that grooves can be provided in both the outer rings and in the inner rings of the bearings, which engage in the web of the thread of the threaded spindle.
    It may be mentioned that as a hollow cylinder having an internal thread, any member having a bore with an internal thread and consequently not limited to tubes can also be seen.
    权利要求:
    Claims (9)
    [1]
    claims
    A screw drive (1; 12; 17; 24) having a threaded element (6), at least one planet and a support (8; 30), said at least one planet supported by said support (8; Threading the thread (6) of the element unrolls and moves the holder (8; 30) linearly along the thread (6) of the element relative to the element, characterized in that the at least one planet by a bearing (2; 18; 25) is formed is, with its outer ring (3; 27) or with its inner ring (4; 20; 33) via an angular portion (11; 21; 31) engages in the thread (6) of the element.
    [2]
    2. screw drive (1; 12; 17; 24) according to claim 1, characterized in that the element as a threaded spindle (7) or as an internal thread (28) exhibiting hollow cylinder (29) is formed.
    [3]
    3. Screw drive (1; 12; 17; 24) according to claim 1 or claim 2, characterized in that the outer ring (3; 27) or inner ring (4; 20; 33) engaging in the thread (6) of the element has a Groove and / or a web (10; 19; 26) in the outer ring (3; 27) or inner ring (4; 20; 33) engages in the thread (6) of the element.
    [4]
    4. screw drive (1; 17; 24) according to one of the preceding claims, characterized in that the axis of the at least one planet to the longitudinal axis (15; 32) of the element tilted and in particular substantially to the pitch of the thread (6) tilted in the holder (8; 30) is fixed.
    [5]
    5. screw drive (12) according to one of claims 1 to 3, characterized in that the at least one planet at least one further bearing (2) and thereby a group (13) of bearings (2) is formed, wherein the bearings (2 ) of a group (13) by a bearing holder (14) with their inner rings (4) are connected and engage with their outer rings (3) in the thread (6) of the element.
    [6]
    6. screw drive (12) according to claim 5, characterized in that the axes (23) of the bearing (2) of a group (13) tilted against each other in the bearing holder (14) are fixed.
    [7]
    7. screw drive (12) according to any one of claims 5 or 6, characterized in that the bearing holder (14) has a groove (22) and / or a web (16) with which they engage in the thread (6) of the element.
    [8]
    8. Screw drive (1; 12; 17; 24) according to one of the preceding claims, characterized in that in the case of screw drives (1; 12; 17; 24) which have a plurality of planets, the planets are approximately at equal angular intervals around or in the same Distributed element arranged and engage in the thread (6).
    [9]
    9. screw drive (1; 12; 17; 24) according to one of the preceding claims, characterized in that the bearings (2; 18; 25) are formed by roller bearings and / or by slide bearings.
    类似技术:
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    DE2753108C2|1982-06-03|Bearing arrangement for the pinion shaft of a bevel gear
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    DE3530558C2|1991-10-17|
    DE102006031956A1|2008-01-17|Double-row ball bearing for motor vehicle, has rows of bearing balls rolling between inner and outer rings, where row of balls are assigned to four-point-ball bearing and angular ball bearing, and inner ring is divided into path areas
    DE102007011849A1|2008-09-18|Apparatus and method for roll forming profiles with variable cross section
    DE102015204198A1|2015-09-24|Non-aligned planet pins for lubricating planetary gear bearings
    DE202013105526U1|2014-02-18|System comprising a roller screw and a roller bearing
    DE1149586B|1963-05-30|Screw drive
    DE2150739A1|1972-04-20|Roller screw drive
    AT517943B1|2017-06-15|Screw drive with at least one bearing as a planet
    EP1982085B1|2010-01-06|Length-variable shaft
    DE3508604C2|1991-12-19|
    DE102007030408A1|2009-01-08|Device for roll stand for rolling of rod-shaped or tubular goods, has roller support, roller and radial bearing with two bearing lines, where diameter of internal bearing race of bearing line is different than another bearing line
    DE2112785A1|1971-11-18|Roller device
    DE102014210957B3|2015-09-03|Device for introducing a bead-like indentation into a wall region of a pipe
    DE3419450A1|1984-12-13|LINEAR SLIDE ROLLER BEARING
    EP2530344B1|2016-11-02|Roller element of a tripod joint and tripod joint comprising such a roller element
    DE2435916C3|1978-06-01|Feed-turning device of a pilger step rolling mill
    DE102013215848A1|2015-02-12|roller bearing
    DE102011007635B4|2013-05-29|Safety concept for a rolling bearing
    DE102012213318A1|2014-01-30|Roller bearing has bearing cage and rolling bodies rotatably mounted in bearing cage, where rolling bodies are provided with two mutually opposite-lying front sides and with lateral surface as rolling surface
    DE102015000253B3|2016-04-28|Pendulum holder with damped coupling
    DE1249020B|1967-08-31|
    DE6920874U|1969-12-04|COMBINED RADIAL-AXIAL SINGLE-TRACK ROLLING BEARING WITHOUT PLAY
    同族专利:
    公开号 | 公开日
    EP3362704A1|2018-08-22|
    US20180313437A1|2018-11-01|
    WO2017063780A1|2017-04-20|
    AT517943B1|2017-06-15|
    引用文献:
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    US9845850B2|2015-01-30|2017-12-19|Irobot Corporation|Robotic arm and wrist mechanisms|KR102037482B1|2018-03-08|2019-10-28|주식회사 위너|Bearing screw transferring apparatus|
    法律状态:
    2021-06-15| MM01| Lapse because of not paying annual fees|Effective date: 20201015 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50876/2015A|AT517943B1|2015-10-15|2015-10-15|Screw drive with at least one bearing as a planet|ATA50876/2015A| AT517943B1|2015-10-15|2015-10-15|Screw drive with at least one bearing as a planet|
    US15/768,529| US20180313437A1|2015-10-15|2016-08-24|Screw drive with at least one bearing as planet|
    PCT/EP2016/070000| WO2017063780A1|2015-10-15|2016-08-24|Threaded drive comprising at least one bearing as planetary gear|
    EP16757635.4A| EP3362704A1|2015-10-15|2016-08-24|Threaded drive comprising at least one bearing as planetary gear|
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