• 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 method for producing a gear (1) in net shape or near-net shape quality, in particular a sprocket, for a WTSystem from a powder, wherein the gear (1) has an at least approximately cylindrical housing (2) in the axial direction of each one end face (6, 7) is limited and the outer surface (3), wherein on the outer surface (3) has a toothing (8) with teeth (9) and tooth roots (10) between the teeth (9) at a distance from the two end faces (6, 7) is formed, and wherein the toothing (8) has a Zahnfußkreis (25) with a Zahnfußkreisdurchmesser, wherein the powder is filled into a die (28) and pressed with at least one stamp, and wherein protrusions (11, 20) are formed at least in the region of the teeth (9) on the outer surface (3) of the housing (2) and projecting therefrom in the radial direction.
    公开号:AT512777A4
    申请号:T50505/2012
    申请日:2012-11-12
    公开日:2013-11-15
    发明作者:
    申请人:Miba Sinter Austria Gmbh；
    IPC主号:
    专利说明:

    1
    The invention relates to a method for producing a gear in net shape or near-net shape quality, in particular a sprocket, for a WT system of a powder, wherein the gear has an at least approximately cylindrical housing, in the axial direction of one end face is delimited and having an outer surface, wherein on the outer surface a toothing with teeth and tooth roots between the teeth at the distance from the two end faces is gedit, and wherein the toothing has a Zahnfußkreis with a Zahnfußkreisdurchmesser, wherein the powder filled into a die and is pressed with at least one stamp, and a gear, in particular sprocket, for a WT system of a powder, wherein the gear has an at least approximately cylindrical housing which is bounded in the axial direction by one end face and which has an outer surface , where on the äuße ren surface toothing with teeth and tooth roots between the teeth at a distance from the two end faces is formed, and wherein the toothing has a Zahnfußkreis with a Zahnfußkreisdurchmesser.
    The production of end accountumahen components in gaining more and more importance, as these components can be made much cheaper. Powder metallurgy seems to be predestined for this, since components with complex geometry can be produced without substantial post-processing with this technology. However, even this technology reaches its limits when the geometry becomes too complex, since due to the adhesion of the components to the walls of the matrix in thin-walled construction areas or components there is a higher risk of breakage and thus the increase in reject production. N2012 / 1
    I 2
    In the prior art, therefore, it has been proposed for the production of sintered components with complex geometry that such components be assembled from individual parts. For example, DE 10 2010 034 014 A1 describes a method for the powder metallurgical production of a rotary body in which a first starting body is pressed from metal powder and a second starting body is formed separately from the first starting body made of metal, wherein the starting body with end faces with respect to a longitudinal axis of Rotary body are placed in axial contact against each other and permanently connected to each other, wherein the first output body of an aluminum-based powder pressed and the second output body formed of an aluminum material and the starting body are sintered together at the end faces.
    The object of the present invention is to be able to represent an initially mentioned gear press-technically.
    The object is achieved on the one hand with the method mentioned above and on the other hand by the above-mentioned gear, is provided by the method that projections are formed at least in the teeth on the outer surface of the housing and on this in the radial direction, or is provided in the gear that are formed at least in the region of the teeth on the outer surface of the housing and projecting projections in the radial direction.
    The advantage here is that the wall thickness of the housing can be reduced, whereby a corresponding weight reduction is achieved, but still the manufacturability of the gear by means of powder metallurgy methods is possible, so that the gear can be produced inexpensively even with complex geometry, as no or only a minor rework is required. It can thus be made easier high-precision gears.
    According to one embodiment of the method and the gear is provided that the projections are formed in axial view in the manner of a wave profile or are. It is thus achieved by avoiding edges at the transitions between the projections and the surface of the housing - viewed in N2012 / 11800 3 radial view - better mold release and better Ver-pressbarkeit the powder or the gear. In addition, a weight reduction of the gear is achieved with at least approximately constant strength in the teeth during the pressing step.
    It is also possible that the projections are formed by axial extension of the recesses for the tooth roots of the toothing, whereby also the demolding and the compressibility can be achieved by the possibility of simpler stamp execution.
    It can further be provided that the projections are recompressed. By this re-compaction, which can take place during shaping by repositioning the at least one stamp, the Stützfünktion the projections for the teeth of the toothing is improved.
    The powder is preferably pressed between a multi-part punch and a multi-part lower punch. Due to the multipartite an improvement of the powder compaction is achieved. In addition, components with complex geometry, in particular undercuts, can thus be produced better. In addition, it can also be used to simplify demolding.
    It can be provided that the Zahnfußdurchmesser is made smaller than a maximum outer diameter of the housing. It is thus a reduction of the powder used per component and thus a weight reduction of the gear possible.
    Preferably, the protrusions have a height above the surface of the housing selected from a range having a lower limit of 20% and an upper limit of 70% of a tooth height of the teeth. Below 20%, a support function is still achieved with the projections, however, it was observed that in the matrix increased tooth fractures occurred. Above 70% there is a risk that the projections interfere with the interaction of the gear with a further toothing element engaging in the toothing or with the chain links of a chain. 4
    The projections can be arranged in the axial direction immediately adjacent to the teeth, whereby the support function for the teeth is more pronounced. But it is also possible that the projections are arranged in the axial direction spaced from the teeth. This can be achieved in particular by a subsequent machining of the gear, whereby on the one hand the support function can be improved during the manufacture of the gear, but on the other hand can be improved by the spacing of the finished gear engagement of the further gear element or the chain in the toothing of the gear. This embodiment is particularly advantageous if the Zahnfußkreisdurchmesser is smaller than the maximum outer diameter of the housing.
    It can further be provided that the projections are arranged in the region of both axial end faces of the teeth, that is, in other words, the teeth are each arranged between two projections, whereby a better stabilization of the teeth during pressing can be achieved.
    For a better understanding of the invention, this will be explained in more detail with reference to the following figures.
    Each shows in a schematically simplified representation:
    Fig. 1 is a perspective view of a gear;
    Fig. 2 shows the gear of Figure 1 in side view.
    3 shows a section through the gear according to FIG. 2 according to III-III in FIG. 2;
    4 shows a section through the gear according to FIG. 2 according to IV-IV in FIG. 2; FIG.
    Fig. 5 shows the designated in Fig. 2 with X section of the teeth of the
    Gear of Figure 2 in an enlarged view.
    Fig. 6 shows a variant of a gear in plan view of the toothing; N2012 / 11800 5 m
    7 shows the gear of Figure 7 after the post-processing.
    8 shows a section of a variant of a pressing tool for producing a toothed wheel;
    9 shows a section of the toothed wheel in relation to the pressing tool according to FIG. 8.
    By way of introduction, it should be noted that in the embodiments described differently, the same parts are given the same reference numerals or the same part designations, the disclosures contained throughout the description can be applied mutatis mutandis to the same parts with the same reference numerals or component names. Also, the location information chosen in the description, such as top, bottom, side, etc. related to the immediately described and illustrated figure and are to be transferred to the new situation mutatis mutandis when a change in position.
    Figs. 1 to 4 show a first embodiment of a gear 1, in particular a sprocket, in different views.
    The gear 1 according to FIGS. 1 to 4 is provided for a so-called WT system (Variable Vaive Timing System). In particular, the gear 1 according to FIGS. 1 to 4 is designed as a stator for a WT system.
    Such stators, as described in the aforementioned DE 10 2010 034 014 A1, are used for the production of Schwenkflügelverstellem for adjusting the rotational angular position of a valve control shaft, such as a camshaft, relative to a crankshaft of an internal combustion engine. As the stator, the part of the Schwenkflüververstellers is called, which is driven in fixed rotational angle relation to the crankshaft and driven by a rotor of the Schwenkflügelverstellers on the valve control shaft. The rotor is rotatable relative to the stator about the longitudinal axis within a limited pivot angle back and forth and thereby the angular position of the valve control shaft relative to the crankshaft adjustable. The stator can by means of its drive pulley with the .1 102012/50505
    Crankshaft mechanically coupled, in particular by a chain drive or a toothed belt drive.
    The gear 1 is produced by a powder metallurgical process from a sintering powder, in particular a metal powder, preferably a steel powder. Such powder metallurgical processes are known from the prior art and comprise in particular the process steps, if appropriate powder mixing, pressing of the powder into a green compact, optionally greenware processing, sintering of the green compact, calibration of the sintered component, optionally post-processing, e.g. grinding, washing, hardening, etc. Since these basic process steps and the various powder metallurgical processes are known from the prior art, reference should be made to the relevant literature.
    The gear is further manufactured in net shape or near-net shape quality. Under net shape quality is understood that no further machining takes place after sintering. Near-net shape, on the other hand, refers to a quality that allows for a small amount of post-treatment to form the final contour. These terms are used in the context of this description according to technical language usage.
    The gear 1 has an at least approximately cylindrical housing 2. By at least approximately cylindrical, it is meant that the housing 2 on an outer surface 3 and / or an inner surface 4 can deviate from the exact cylindrical shape as a function of the intended use of the toothed wheel 1.
    The housing 2 is bounded in the axial direction according to arrow 5 by a first end face 6 and a second end face 7.
    On the outer surface 3, a toothing 8 is arranged or formed, the teeth 9 and between the teeth 9 tooth roots 10 has.
    The toothing 8 is designed to engage a drive chain. However, there is also the possibility that the shape of the teeth 9 is designed differently, while
    7 example, for the engagement of a toothed belt or a rack of another gear or generally another toothed element with a further toothing.
    The toothing 8 is arranged at a distance to the two end face 6, 7, wherein in the illustrated embodiment the distance to the first end face 6 is smaller than the distance to the second end face 7.
    The toothing 8 is formed integrally with the housing 2, i. that the gear is not assembled from two components as in the above-cited prior art. In general, the entire gear 1 is formed in one piece and in one piece.
    On the outer surface 3 of the housing 2 a plurality of projections 11 are arranged or formed projecting over this in the radial direction. The projections 11 are arranged in the region of the teeth Θ. In particular, the projections 11 are each arranged between two toothed feet 10 in the region of toothing surfaces 12 pointing in the radial direction.
    The cross section of the projections 11 - viewed in the axial direction according to arrow 5 - may be square, rectangular, triangular, trapezoidal, polygonal, etc. formed. In the preferred embodiment, however, the projections 11 are formed in the manner of a wave profile. Preferably, troughs 13 are arranged below the tooth roots 10 and peaks 14 below tooth tips 15 of the teeth 9, as can be seen in particular from the detail in FIG. 5. In particular, the deepest points of the wave troughs 13 are located exactly underneath the deepest points of the tooth roots 10 and / or the highest points of the wave crests 14 just below the highest points of the tooth heads 15, in each case in the context of manufacturing tolerances. In this embodiment, therefore, all the projections 11 are connected to a common wave profile with each other. In essence, the "waveform" of the toothing 8 can be approximately reproduced by the projections 11. However, it should be expressly understood that this waveform of the projections 11 forms no further toothing. mmmmmm N2012 / 11800 8 In the preferred embodiment, there is a respective projection 11 in the region of a respective tooth 9, so that therefore in the region of each tooth a projection 11 is formed.
    It should be mentioned that it is possible within the scope of the invention that more than one projection 11 is arranged in the region of one of the tooth end faces 12 per tooth 9 or in the region of individual teeth 9, for example two, etc.
    The projections 11 may have in the radial direction a height 16 (Figure 2) over the outer surface 3 of the housing 2, which is selected from a range with a lower limit of 20%, in particular 30%, and an upper limit of 70%, in particular 60%, a tooth height 17 (Fig. 5) of the teeth 9. This height 16 is measured from that point, starting from the outer surface 3 of the housing 2, the Zylinderfoim, as for example in Fig. 2 in the area subsequently the second end face 7 is formed, leaves.
    A width 18 of the projections 11 in the axial direction according to arrow 5 can be selected from a range with a lower limit of 5%, in particular 10%, and an upper limit of 80%, in particular 70%, of a housing width 19 in the same direction. In particular, the projections 11 may extend from the toothing 8 to the first end face 6, as can be seen from FIGS. 1 to 4.
    In principle, it is possible for the projections 11, viewed in the axial direction according to arrow 11, to be arranged on only one side of the teeth 9. However, FIGS. 1 to 4 show the preferred embodiment of the toothed wheel 1, in which, in addition to the projections 11 in the region of the tooth-striking surface 12, projections 20 are also provided in the region of a further tooth-striking surface 21 pointing in the direction of the second end face 7 are arranged.
    These projections 20 may in principle be formed as the projections 11, so reference is made to the above statements.
    In the preferred embodiment, however, these further projections 20 are ramp-shaped, starting with an increasing height at the
    9
    Outer surface 3 of the housing 2 into the region of the teeth 9, as can be seen in particular from FIGS. 3 and 4. The pitch may be selected from a range with a lower limit of 0.5 ° and an upper limit of 5 ® It is also possible that the further projections 20 have an area with slope 0 °, especially in the teeth 9 ,
    As can be seen from these further projections 20 from FIGS. 1 to 4, the projections 20 can also terminate in front of the second end face 7 of the housing, so that a region 22 of the cylindrical housing 2 remains free of further projections 20. This also applies to the projections 11. Of course, the other projections 20 but can reach to the second end face 7 of the housing 2.
    Generally, with respect to the terms "cylindrical housing 2 " and "projections 11,20" noted that the projections 11 and the other projections 20 begin where the housing 2 leaves the cylindrical shape. It is also possible that the housing is stepped, that has a plurality of adjoining cylinder with different diameters. In this case, the respective description is related to the projections 11 and 20 respectively to the respective cylindrical outer surface 3.
    It should also be noted that the housing 2 in the inner surface 4 may also have function-related internals, which are in particular formed integrally with the housing 2, preferably formed integrally with the housing 2 in one or more pressing steps. The above formulation "at least approximately cylindrical" is based on the deviation of the cylindrical shape of the housing 2 through these internals.
    It is further apparent from FIGS. 1 to 4 that the projections 11 have a different geometry than the other projections 20. However, within the scope of the invention, it is possible for the projections 11 to have the same geometry as the further projections 20.
    N2012 / 11800: 1: 1
    10
    The further projections 20 are separated from each other by recesses 23. In the preferred embodiment, these recesses 23 are formed by axial extension of recesses 24 to form the tooth roots 10 of the toothing 8. In other words, therefore, the tooth roots 10 are extended in the direction of the second end face 7 of the housing 2. In this case, it is preferred if the recesses 23 between the further projections 20 in the direction of the second end face 7 of the housing 2 have a decreasing in cross-section viewed in plan view, that are at least approximately pointed tapered, wherein the "tip" can be made rounded.
    But it is also possible that the recesses 23 between the other projections 20 have a different cross-sectional shape, for example, rectangular or trapezoidal or with rounded side surfaces, etc. is executed. The rounded side surfaces are possible even in the tapered embodiment of these recesses 23.
    The height 16 in the radial direction of the projections 11 may be such that these projections 11 reach their maximum height 16 at the level of a Zahnfußkreises 25 of the tooth roots 10, as shown in FIG. 5 can be seen. The Zahnfußkreis designates the diameter of the circle is formed by the lowest points of the tooth roots 10.
    But there is also the possibility that the projections 11 extend in the radial direction to above the Zahnfußkreises 25 or terminate below this.
    According to another embodiment, it may be provided that the Zahnfußkreis 25 has a smaller diameter than a maximum outer diameter of the cylindrical housing 2 in the area adjacent to the tooth roots 10, so in other words the tooth roots 10 are formed by negative recesses in the housing 2.
    N2012 / 11800
    In the embodiment of the gear 1 shown in FIGS. 1 to 4, the projections 11 and 20 in the axial direction according to arrow 5 immediately adjacent to the teeth 9 of the toothing 8 are arranged.
    In Fig. 6 and 7, a further and optionally independent in its own execution of the gear 1 is shown, again with the same parts the same reference numerals or component names are used as in the preceding Fig. In order to avoid unnecessary repetition, reference is made to the detailed description in the preceding FIGS. 1 to 5 and referred to.
    The essential differences from the embodiment of the gear 1 described above are that, on the one hand, only the further projections 20 are formed, that is, the area between the first end face 6 of the housing 2 and the teeth 9 is free of projections, and, on the other hand, the further projections 20 Spaced apart in the axial direction to the teeth, so a circumferential groove 26 between the teeth 9 and the other projections 20 is formed.
    This embodiment is made of a sintered and calibrated "blank" of the gear 1, which is shown in Fig. 1, by cutting machining. For this purpose, the blank initially has the toothing 8 extending in the axial direction as far as the first end face 6 of the housing 2. From this toothing 8, a region starting at the first end face 6 is removed as a result.
    Further, in the blank, the further projections 20 are formed on the teeth 8 fitting, and are removed in the sequence in the adjoining the teeth 8 area a portion of the other projections 20 to form the groove 26.
    Fig. 7 shows the finished gear 1 after these processing steps. It is therefore produced in this embodiment of the gear 1 this in the near-net Sha-pe quality. N2012 / 11
    FIG. 8 shows a detail of a pressing tool 27 for producing the toothed wheel 1.
    It should be noted that this pressing tool 27 can be used for the pressing of the powder to form the green compact for the gear 1 and / or for the calibration of the sintered gear 1. The method according to the invention therefore designates the pressing step and / or the calibration step in the powder-technological production of the toothed wheel 1.
    The pressing tool 27 has a die 28, an upper punch 29 and a lower punch 30. The upper punch 29 and / or the lower punch 30 are designed to be adjustable relative to one another in the vertical direction.
    Preferably, the upper punch 29 is designed in several parts and has at least a first upper punch part 31 and a second upper punch part 32. In this case, the first upper punch part 31 is arranged between the die 28 and the second upper punch part 31. The two upper punch parts 31,32 are independently adjustable.
    The lower punch 30 is preferably designed in several parts and has at least a first lower punch part 33 and a second lower punch part 34. In this case, the first lower punch part 31 is arranged between the die 28 and the second lower punch part 31. The two lower punch parts 31, 32 are independently adjustable.
    FIG. 9 shows a section of the toothed wheel 1, the section line VIII-VIII corresponding to the section through the pressing tool 27 in FIG. 8. The dashed line shown in Fig. 8 are the tooth contour of the toothing 8 again.
    The division of the upper punch 29 in the two upper punch parts 31, 32 and the division of the lower punch 30 in the two lower punch parts 33, 34 is chosen so that the upper punch part 31 and the lower punch part 33 are provided for the processing or training of the teeth 8 and the upper punch part 32 and the lower punch part 34 for processing the projections 11 (Fig. 9). N2012 / 11800 13
    It is possible with this pressing tool 27 to produce the gear 1 in net shape or near-net shape quality.
    Optionally, the toothing 8 is at least partially brushed and / or ground after the production of the gear 1.
    The multi-parting of the upper punch 29 and / or the lower punch 30 also make it possible that the projections 11, 20 are recompressed by the repositioning of the upper punch part 32 and / or the lower punch part 34.
    According to the method for producing a gear 1 in net shape or near-net shape quality for a WT system is provided that from a powder, the gear 1 with the at least approximately cylindrical housing 2, in the axial direction of one end face. 6 , 7 is limited and which has the outer surface 3 is prepared, wherein on the outer surface 3, the teeth 8 with teeth 9 and tooth roots 10 between the teeth 9 at a distance from the two end faces 6, 7 is formed, and wherein the teeth 8 a Tooth base circle 25 with a diameter aulweist, wherein the powder is filled into the die 28 and pressed with at least one stamp, wherein at least in the region of the teeth 9 on the outer surface 3 of the housing 2 and projecting projections in the radial direction 11,20 are formed ,
    This method is also applicable to the production of other sintered components, e.g. Timing belt wheels or sprockets.
    The method is provided in particular for producing thin-walled sintered components with toothings 8.
    The embodiments show possible embodiments of the gear 1 and the pressing tool 27th
    For the sake of order, it should finally be pointed out that for a better understanding of the construction of the toothed wheel 1 and of the pressing tool 27, these or their components have been shown partly unevenly and / or enlarged and / or reduced in size. N2012 / 11800
    I
    REFERENCE SIGNS LIST 1 gear 2 housing 3 outer surface 4 inner surface 5 arrow 6 end face 7 end face 8 toothing 9 tooth 10 tooth root 11 projection 12 tooth face 13 wave trough 14 wave crown 15 tooth head 16 height 17 tooth height 18 width 19 housing width 20 projections 21 tooth face 22 area 23 recess 24 recess 25 Tooth root circle 26 Groove 27 Press tool 28 Die 29 Upper punch 30 Lower punch 31 Over stamped 32 Upper punch part 33 Lower punch part 34 Lower punch part N2012 / 1
    权利要求:
    Claims (14)
    [1]
    1. A method for producing a gear (1) in net shape or near-net shape quality, in particular a sprocket, for a WT system of a powder, wherein the gear (1) has an at least approximately cylindrical housing (2) which is bounded in the axial direction by a respective end face (6, 7) and the outer surface (3), wherein on the outer surface (3) has a toothing (8) with teeth (9) and tooth roots (10) between the teeth (3) 9) at a distance from the two end faces (6, 7) is formed, and wherein the toothing (8) has a Zahnfußkreis (25) with a Zahnfußkreisdurchmesser, wherein the powder is filled into a die (28) and pressed with at least one stamp , characterized in that at least in the region of the teeth (9) on the outer surface (3) of the housing (2) and on this projecting projections (11, 20) are formed in the radial direction.
    [2]
    2. The method according to claim 1, characterized in that the projections (11) are formed in axial view in the manner of a wave profile.
    [3]
    3. The method according to claim 1 or 2, characterized in that the projections (20) by recesses (23) are separated from each other, by axial extension of recesses (24) for the Zahrrfüße (10) of the toothing (8) are formed.
    [4]
    4. The method according to any one of claims 1 to 3, characterized in that the projections (11, 20) are recompressed.
    [5]
    5. The method according to any one of claims 1 to 4, characterized in that the powder between a multipart upper punch (29) and a multi-part lower punch (30) is pressed. WEm N2012 / 1
    [6]
    6. The method according to any one of claims 1 to 5, characterized in that the Zahnfußkreisdurchmesser is made smaller than a maximum outer diameter of the housing (2) adjoining the toothing (9) region of the housing (2).
    [7]
    7. toothed wheel (1), in particular a sprocket wheel, for a WT system comprising a powder which has an at least approximately cylindrical housing (2) which is delimited in the axial direction by a respective end face (6, 7) and which has an outer surface ( 3), wherein on the outer surface (3) a toothing (8) with teeth (9) and tooth roots (10) between the teeth (9) at a distance from the two end faces (6, 7) is formed, and wherein the toothing (8) has a Zahnfußkreis (25) with a Zahnfußkreisdurchmesser, characterized in that at least in the region of the teeth (9) on the outer surface (3) of the housing (2) and projecting projections in the radial direction (11, 20) are.
    [8]
    8. gear (1) according to claim 7, characterized in that the projections (11) are formed in axial view in the manner of a wave profile.
    [9]
    9. gear (1) according to claim 7 or 8, characterized in that the projections (20) by recesses (23) are separated from each other, by axial extension of recesses (24) for the tooth roots (10) of the toothing (8). are formed.
    [10]
    10. Gear (1) according to one of claims 7 to 9, characterized in that the projections (11, 20) have a height (16) over the outer surface (3) of the housing (2), which is selected from a range with a lower limit of 20% and an upper limit of 70% of a tooth height (17) of the teeth (9). N2012 / 11800 3
    [11]
    11. gear (1) according to one of claims 7 to 10, characterized in that the Zahnfußkreisdurchmesser is smaller than a maximum outer diameter of the housing (2) in the toothing (8) adjoining area.
    [12]
    12. gear (1) according to one of claims 7 to 11, characterized in that the projections {11,20) in the axial direction immediately adjacent to the teeth (9) are arranged.
    [13]
    13. gear (1) according to one of claims 7 to 11, characterized in that the projections (11,20) in the axial direction spaced from the teeth (9) are arranged.
    [14]
    14. gear (1) according to one of claims 7 to 13, characterized in that the projections {11,20) in the region of both axial Zahnstimflächen (12, 21) of the teeth (9) are arranged.
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    同族专利:
    公开号 | 公开日
    US20140135160A1|2014-05-15|
    CN103807409B|2018-05-15|
    DE102013112246A1|2014-05-15|
    AT512777B1|2013-11-15|
    CN103807409A|2014-05-21|
    BR102013029132A2|2014-10-21|
    US9346100B2|2016-05-24|
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    法律状态:
    2021-07-15| MM01| Lapse because of not paying annual fees|Effective date: 20201112 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50505/2012A|AT512777B1|2012-11-12|2012-11-12|gear|ATA50505/2012A| AT512777B1|2012-11-12|2012-11-12|gear|
    CN201310416268.9A| CN103807409B|2012-11-12|2013-09-13|Gear|
    US14/069,467| US9346100B2|2012-11-12|2013-11-01|Method for producing a toothed wheel|
    DE102013112246.9A| DE102013112246A1|2012-11-12|2013-11-07|gear|
    BRBR102013029132-3A| BR102013029132A2|2012-11-12|2013-11-12|GEAR|
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