Gear machining device

Abstract

The invention provides a gear machining device which can improve relative gear precision when a plurality of gears are machined at the same time. The gear machining device (10) is used for machining a plurality of gears (30) clamped in a stacked mode at the same time, and the gears are provided with first positioning holes (31) formed in the rotation center portions and second positioning holes (32) formed in the peripheral portions of the first positioning holes. A clamp (21) for holding the gear is provided with a collet chuck (213) inserted into the first positioning hole and a rotation direction positioning mechanism (215) inserted into the second positioning hole. The rotation direction positioning mechanism is provided with a ball plunger as a thrust generator, and the thrust direction of the ball plunger is oriented in a direction substantially coincident with the tangential direction with the center of the second positioning hole as the point of tangency on an imaginary circle with the first positioning hole as the center. The ball plungers acting on each of the plurality of gears are arranged in the longitudinal direction of the rotation direction positioning mechanism.

Description

Technical Field

[0001] The present invention relates to a gear processing device for processing multiple gears simultaneously. Background Art

[0002] In a cycloid speed reducer or the like, although multiple gears of the same specification (same shape) are used in a set, in order to obtain good power transmission efficiency, it is required that these gears can improve the relative gear accuracy. However, when the tooth surfaces of such gears used in a set are finish-machined one by one in a single form, it is impossible to expect an improvement in relative gear accuracy or productivity. Patent Document 1 discloses a manufacturing method and a processing device for improving productivity by processing multiple gears simultaneously.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2022-60793 Summary of the Invention

[0006] The processing device of Patent Document 1 discloses a jig for holding multiple gears to be processed simultaneously. The jig includes a central axis positioning pin and a rotational direction positioning pin, and holes for inserting these pins are provided on the gear side. When the gear is assembled to the jig, there is a slight gap (tolerance caused by manufacturing errors of the components themselves or assembly, etc.) between the hole and the pin. As a result, a problem of improving the relative gear accuracy arises. Specifically, when each gear is assembled with respect to the jig for holding multiple gears, a deviation in the relative rotational direction occurs. If the gear is clamped and processed in a state accompanied by this deviation, it may lead to a decrease in relative gear accuracy.

[0007] The present invention has been completed in view of the above problems, and an object thereof is to provide a gear processing device capable of improving the relative gear accuracy for gears of the same specification (same shape) processed simultaneously.

[0008] In order to solve the above problems, the gear processing device of the present invention is a gear processing device for simultaneously processing a plurality of gears held in a stacked manner, characterized in that: in the gear, there are provided a first positioning hole at the rotation center part of the gear and a second positioning hole at the peripheral part of the first positioning hole; in the fixture for holding the gear, there are provided a central axis positioning mechanism inserted into the first positioning hole and a rotation direction positioning mechanism inserted into the second positioning hole, and the rotation direction positioning mechanism includes a thrust generator that abuts against the second positioning hole, and the direction of the thrust of the thrust generator is substantially the same as the tangent direction at the tangent point of the center of the second positioning hole on an imaginary circle centered on the first positioning hole, and moreover, the thrust generators acting on each of the plurality of gears are arranged along the length direction of the rotation direction positioning mechanism.

[0009] According to the above configuration, when the central axis positioning mechanism and the rotation direction positioning mechanism are inserted into the first positioning hole and the second positioning hole of a plurality of gears, once the thrust generator abuts against the second positioning hole, it will be subjected to its thrust, causing the gears to rotate and displace respectively around the central axis positioning mechanism, and the second positioning hole is based on the rotation direction positioning mechanism, so that it can be in close contact here without shaking. Therefore, it is possible to reliably prevent the relative position deviation in the rotation direction of all the gears stacked on the central axis positioning mechanism and the rotation direction positioning mechanism, and at the same time, they can be processed.

[0010] Therefore, the gear processing device of the present invention can achieve the effect of improving the relative gear accuracy and productivity when simultaneously processing a plurality of gears. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a perspective view showing the main part of the gear grinding device according to the embodiment of the present invention.

[0012] Figure 2 It is a side view of the workpiece mandrel.

[0013] Figure 3 It is a longitudinal sectional view of the workpiece clamping device in a state of holding two gears.

[0014] Figure 4 It is a transverse sectional view of the workpiece clamping device in a state of holding two gears.

[0015] Figure 5 It is a longitudinal sectional view showing the state before the upper clamping member in the workpiece clamping device is fixed.

[0016] Figure 6 It is a perspective view showing the state of embedding two gears into the lower clamping member.

[0017] Figure 7 It is a longitudinal sectional view of a workpiece clamping device at a position including the center of the plunger.

[0018] Figure 8 It is an explanatory diagram showing the thrust direction acting on the gear assembled in the fixture.

[0019] Figure 9 It is an enlarged transverse sectional view of the rotation direction positioning mechanism and its peripheral part in the workpiece clamping device in a state where two gears are held.

[0020] Explanation of reference numerals

[0021] 10…Gear grinding device (gear processing device); 13…Threaded grinding wheel; 20…Workpiece mandrel; 21…Workpiece clamping device (fixture); 211…Lower clamping member; 212…Upper clamping member; 213…Collet chuck (center axis positioning mechanism); 214…Expansion cone; 215…Rotation direction positioning mechanism; 2151…Thrust generator; 216…Axial insertion guide member; 30…Gear; 31…First positioning hole; 32…Second positioning hole. Detailed implementation mode

[0022] Hereinafter, with reference to the drawings, the implementation mode of the present invention will be described in detail. In addition, in the present implementation mode, a case where the gear processing device of the present invention is applied to a gear grinding device for finely grinding the tooth surface of a gear as a workpiece (workpiece) is illustrated. However, the present invention is not limited thereto, and the present invention can also be applied to a gear cutting device for performing gear cutting.

[0023] Figure 1 A perspective view showing the main part of the gear grinding device 10 according to the present implementation mode. In the present implementation mode, for the sake of convenience of explanation, as Figure 1 shown, the X-axis direction (front-rear direction), Y-axis direction (left-right direction), and Z-axis direction (up-down direction) are defined.

[0024] As Figure 1 shown, the gear grinding device 10 supports the workpiece spindle motor 12 on the base 11 and connects the rotation shaft (not shown) of the workpiece spindle motor 12 to the spindle 12a. The spindle 12a is a rotation shaft extending along the Z-axis direction. On the spindle 12a, there is provided: a workpiece mandrel 20 that can rotate together with the spindle 12a. The gear 30 to be processed is assembled on the workpiece mandrel 20. The spindle motor 12 is driven in response to a machining start command, so that the gear 30 is rotationally driven. Although it will be described in detail later, the gear 30 having a plurality of (two in the figure) tooth portions in the state before finishing can be overlapped and mounted on the workpiece mandrel 20.

[0025] In addition, in the present embodiment, the gear 30 has a cycloidal tooth profile, and a gear (cycloidal gear) used in a cycloidal speed reducer is exemplified. However, the present invention is not limited thereto, and the gear 30 to be machined may also be a gear having an involute tooth profile other than the cycloidal tooth profile, for example.

[0026] The outer peripheral surface of the threaded grinding wheel 13 is provided with a rack (thread teeth formed in a spiral shape). By meshing this rack with the gear 30, the tooth surface of the gear 30 is ground. Specifically, the threaded grinding wheel 13 is mounted on the rotating shaft 14b of the grinding spindle motor 14a, and the rotating shaft 14b extends along the X-axis direction. Accordingly, while rotating the threaded grinding wheel 13 in the YZ plane, the tooth surface grinding of the gear 30 can be performed. In addition, the threaded grinding wheel 13 can be moved in the X-axis direction, Y-axis direction, and Z-axis direction by the mechanism described below.

[0027] The grinding spindle motor 14a is supported by the first moving unit 14 and is supported so as to be able to slide in the Z-axis direction together with the first moving unit 14 along a guide rail (not shown) fixed to the second moving unit 15. A Z-axis motor 16 is provided on the upper part of the second moving unit 15, and the rotating shaft of the Z-axis motor 16 is connected to the first moving unit 14 by a ball screw mechanism (not shown) inside the second moving unit 15. Therefore, by rotating the Z-axis motor 16, the threaded grinding wheel 13 can be moved in the Z-axis direction together with the first moving unit 14.

[0028] The second moving unit 15 is mounted so as to be able to slide in the X-axis direction along a guide rail 17a fixed to the upper surface of the third moving unit 17. An X-axis motor 18 is provided at the end of the third moving unit 17, and the rotating shaft of the X-axis motor 18 is connected to the second moving unit 15 by a ball screw mechanism (not shown) inside the third moving unit 17. Therefore, by rotating the X-axis motor 18, the second moving unit 15 (that is, the threaded grinding wheel 13) can be moved in the X-axis direction.

[0029] The third moving unit 17 is mounted so as to be able to slide in the Y-axis direction along a guide rail 11a on the upper surface of the base 11. A Y-axis motor 19 is provided at the end of the base 11, and the rotating shaft of the Y-axis motor 19 is connected to the third moving unit 17 by a ball screw mechanism (not shown) inside the base 11. Therefore, by rotating the Y-axis motor 19, the third moving unit 17 (that is, the threaded grinding wheel 13) can be moved in the Y-axis direction.

[0030] In addition, the basic operation of the gear grinding device 10 will be described. First, the X-axis motor 18, Y-axis motor 19, and Z-axis motor 16 are controlled to position the threaded grinding wheel 13 diagonally below the gear 30 (approach operation). At this time, the end of the threaded grinding wheel 13 coincides with the end of the gear 30 in the vertical position. Next, the threaded grinding wheel 13 is moved toward the gear 30 in the Y-axis direction by a predetermined amount (depth of cut) (cutting operation).

[0031] Next, while rotating the gear 30 and the threaded grinding wheel 13, the threaded grinding wheel 13 is moved in the vertical direction (Z-axis direction) (passing operation). Additionally, the initial passing operation moves the threaded grinding wheel 13 upward. Accordingly, the gear 30 is ground according to the depth of the depth of cut. This passing operation is performed until the upper surface of the gear 30 is ground.

[0032] Next, the cutting operation is performed again. That is, the threaded grinding wheel 13 is moved toward the gear 30 in the Y-axis direction by a predetermined depth of cut. Thereafter, the passing operation is performed downward for grinding. Thereafter, the cutting operation and the passing operation are alternately repeated. When the above operations are performed a predetermined number of times, the threaded grinding wheel 13 is separated from the gear 30 (in the Y-axis direction, grinding wheel meshing separation operation). The tooth surface grinding operation is performed as described above.

[0033] The gear grinding device 10 of the present invention is characterized in that it is configured such that a plurality of gears 30 can be mounted on the workpiece spindle 20 of the main spindle 12a with the same phase. Hereinafter, this mounting structure will be described in detail. Figure 2 This is a side view of the workpiece spindle 20. However, Figure 2 in this figure, the upper part of the main spindle 12a is shown in cross section.

[0034] At the lower part of the main body of the workpiece spindle 20, a first fitting portion 20a for detachably fixing to the main spindle 12a is provided so as to protrude more downward than the main spindle mounting surface. By gripping the first fitting portion 20a with the gripping mechanism 12b opening upward facing the upper part of the main spindle 12a and pulling it into the main spindle 12a, the workpiece spindle 20 is vertically held on the main spindle 12a so as to be integrally rotatable. At the upper part of the workpiece spindle 20, a workpiece gripping device 21 serving as a jig for holding the gear 30 is provided. 20b is a second fitting portion for detachably fixing the workpiece gripping device 21 integrally with the workpiece spindle 20.

[0035] Figure 3 This is a longitudinal sectional view of the workpiece gripping device 21 in a state of holding two gears 30 ( Figure 4 sectional view taken along line III - III). As Figure 3As shown, a second mounting portion 20b that protrudes upward more than the upper end surface of the workpiece mandrel 20 is formed in a shaft shape concentric with the rotation axis of the workpiece mandrel 20, and the workpiece clamping device 21 is mounted on the second mounting portion 20b. The workpiece clamping device 21 is composed of an upper clamping member 212 and a lower clamping member 211.

[0036] The upper clamping member 212 is composed of a metal member having a depth and formed in a disk-like shape. The peripheral portion of the upper clamping member 212 is set to face downward, and an expansion cone 214 is provided downward at its rotation center portion. The expansion cone 214 is formed in a hollow shape so that the central portion of the second mounting portion 20b can be installed. A hole is provided in the central portion of the upper clamping member 212, and a screw provided at the end of the second mounting portion 20b passes through this hole. When the machining of the gear 30 is completed and a new unprocessed gear 30 is assembled to the clamping mechanism 12b, this screw is removed. In this way, the upper clamping member 212 can be separated from the lower clamping member 211.

[0037] The lower clamping member 211 is composed of a metal member having a depth and formed in a disk-like shape. The peripheral portion of the lower clamping member 211 is set to face upward, and a collet chuck 213 as a central axis positioning mechanism is installed at its rotation center portion. Moreover, a rotation direction positioning mechanism 215 and an axial insertion guide member 216 are installed in parallel in its peripheral portion in an upward-facing manner. The collet chuck 213 is formed in a through shape so that the second mounting portion 20b can pass through.

[0038] The lower clamping member 211 is fixed to the upper end surface of the workpiece mandrel 20. The second mounting portion 20b is in a state of passing through the central portion of the lower clamping member 211, and the collet chuck 213 is inserted into the central portion of the second mounting portion 20b, thereby constituting a central axis positioning mechanism.

[0039] When using the gear grinding device 10 of the present invention to machine two gears 30 simultaneously, in the workpiece clamping device 21 on the main shaft 12a, the two members 211 and 212 are fastened in such a way that these gears 30 are clamped between the peripheral portion of the lower clamping member 211 and the peripheral portion of the upper clamping member 212. The two gears 30 are fixed by this fastening so that they will not generate relative rotational displacement with respect to the workpiece clamping device 21 even under machining loads. That is, the workpiece clamping device 21 holds the tooth profiles of a plurality of (two in this example) gears 30 in an overlapping manner with the same phase and concentric configuration.

[0040] Therefore, the length (height) of the central axis positioning mechanism (collet chuck 213, rotation direction positioning mechanism 215) is set to match the total thickness dimension of the stacked gears 30. Figure 4A cross-sectional view taken laterally of the workpiece clamping device 21 while holding the gear 30 Figure 3 (sectional view taken along line IV-IV). The gear 30 has: a first positioning hole 31 formed at the rotational center portion, and a second positioning hole 32 formed at the peripheral portion of the first positioning hole 31.

[0041] The first positioning hole 31 of the gear 30 is a through hole for inserting the center shaft positioning mechanism (collet chuck 213) of the lower clamping member 211. When fastening the upper clamping member 212 to the lower clamping member 211, the nut N is fastened to the threaded portion formed at the end of the second fitting portion 20b. At this time, the outer peripheral surface of the collet chuck 213 receives an axial pressing force from the expanding cone 214 and expands toward the radially outer side, thereby closely contacting the inner peripheral surface of the first positioning hole 31 without play. As a result, the gear 30 is positioned on the workpiece spindle 20 such that its rotational center coincides with the rotational axis of the workpiece clamping device 21 and the workpiece spindle 20, and is fixed so as not to rotate relatively.

[0042] In addition, the gear 30 of the present embodiment is a cycloidal gear, and the first positioning hole 31 is used as: a hole for mounting a crankshaft for a cycloidal speed reducer (not shown).

[0043] The second positioning hole 32 of the gear 30 is a through hole for positioning the workpiece clamping device 21 in the rotational direction (circumferential direction), and the rotational direction positioning mechanism 215 is inserted into the second positioning hole 32.

[0044] In addition, the second positioning hole 32 is used as: a power transmission hole for the reduction rotation output roller in the cycloidal speed reducer to make a sliding contact. Thus, a plurality of ( Figure 4 three in

[0045] this example) second positioning holes 32 are formed at equal angles along the circumferential direction of the gear 30, but it is sufficient if the rotational direction positioning mechanism 215 is inserted into at least one of them.

[0046] In addition, when there is a second positioning hole 32 in the gear 30 into which the rotational direction positioning mechanism 215 is not inserted, the axial insertion guide member 216 can be inserted into the second positioning hole 32. However, the axial insertion guide member 216 itself is not essential for the present invention. The outer diameter of the axial insertion guide member 216 is slightly smaller than the inner diameter of the second positioning hole 32. When using the axial insertion guide member 216, the insertion of the rotational direction positioning mechanism 215 into the second positioning hole 32 can be facilitated.

[0046] Next, the installation sequence of the gear 30 on the workpiece clamping device 21 will be described. Figure 5 is a longitudinal sectional view showing the state immediately before the upper clamping member 212 in the workpiece clamping device 21 is fixed (the same section as Figure 3 ).Figure 6 It is a perspective view showing a state where two gears 30 are inserted into the lower clamping member 211.

[0047] As Figure 5 and Figure 6 shown, the gears 30 in the stacking quantity are sequentially stacked on the lower clamping member 211 in such a manner that the collet 213 is inserted into the first positioning hole 31 and the rotation direction positioning mechanism 215 (and the axial insertion guide member 216) is inserted into the second positioning hole 32 (refer to Figure 6 ).

[0048] After the gears 30 are stacked on the lower clamping member 211, the upper clamping member 212 is covered over the uppermost gear, and the nut N (refer to Figure 5 ) is fastened to the end of the second fitting portion 20b protruding from the upper surface of the upper clamping member 212. Thus, the upper clamping member 212 is fixed, and the two gears 30, the workpiece clamping device 21, and the workpiece mandrel 20 are integrated.

[0049] In addition, a compression spring S is disposed between the upper clamping member 212 and the expansion cone 214, and the expansion cone 214 uses the acting force of the compression spring S as an axial pressing force pressing on the collet 213. Accordingly, when tightening the nut N, the tightening force can avoid a situation where an excessive pressing force acts on the collet 213 from the expansion cone 214 due to the deflection of the compression spring S.

[0050] The gear grinding device 10 of the present invention can simultaneously finish-machine a plurality of gears 30 held by the workpiece clamping device 21, thereby enabling an improvement in productivity. In addition, the gear grinding device 10 can improve the relative gear accuracy of the plurality of gears 30 that are simultaneously finish-machined. Hereinafter, the positioning mechanism of the plurality of gears 30 in the rotation direction in the gear grinding device 10 adopted for this purpose will be described.

[0051] As described above, the gear 30 held by the workpiece clamping device 21 is centered and positioned by the collet 213. Generally, the collet 213 can position the center of the gear 30 with high precision relative to the rotation axis on the mounting side as a reference (the rotation axis of the workpiece mandrel 20 in this embodiment). In this embodiment, the collet 213 corresponds to the center axis positioning mechanism recited in the claims.

[0052] The rotation direction positioning mechanism 215 inserted into the second positioning hole 32 of the gear 30 for positioning the rotation direction of the gear 30 includes a main body portion 215a and is configured as follows.

[0053] As Figure 8As shown, it is set that: a hypothetical circle C centered on the rotation axis of the gear 30 (and the workpiece clamping device 21) and passing through the center O of the second positioning hole 32, and a tangent line L passing through the second positioning hole 32 is set on the hypothetical circle C. Next, on the outer peripheral surface of the main body 215a of the rotational direction positioning mechanism 215, the area through which the tangent line L passes is set as the first surface portion 215b and the second surface portion 215c.

[0054] The first surface portion 215b is formed as an arc surface, the radius of curvature of which is the same as that of the inner peripheral surface of the second positioning hole 32, and functions as a stopper that can abut against the inner peripheral surface of the second positioning hole 32. The first surface portion 215b is formed in an arc shape from the upper end side to the lower end side along its axial direction by an amount corresponding to the length of the main body 215a. When the gears 30 are assembled one by one to the lower clamping member 211, a thrust described later is imparted. At this time, the first surface portion 215b abuts against each second positioning hole 32.

[0055] The second surface portion 215c is formed as a flat surface and is provided so that the thrust generator (a ball plunger in the present embodiment) 2151 protrudes. The thrust generator 2151 is assembled and held on the second surface portion 215c in such a manner that the direction of its thrust is toward the tangent line L. By making the thrust of the thrust generator 2151 substantially coincide with the tangent line L, the end movable portion (a ball described later in the present embodiment) of the thrust generator 2151 abutting against the inner peripheral surface of the second positioning hole 32 imparts an action to the gear 30 in the rotational direction centered on the central axis positioning mechanism 213. One or more (one in the embodiment) of the thrust generators 2151 are prepared along the axial direction of the main body 215a corresponding to the thickness of one gear 30. In addition, the thrust generators 2151 are arranged along the length direction of the main body 215a in accordance with the number of gears 30 stacked on the main body 215a (two in the embodiment). Accordingly, thrust can be imparted to all the gears 30 inserted into the main body 215a.

[0056] Figure 7 It is a longitudinal sectional view of the workpiece clamping device 21 at the position including the center of the thrust generator 2151 ( Figure 4 sectional view taken along line VII-VII). As Figure 7As shown, a spring 2151a is built into the thrust generator 2151, and the ball 2151b abuts against the movable end side of the spring 2151a. When the main body 215a of the rotational direction positioning mechanism 215 is inserted into the second positioning hole 32, the ball 2151b contacts its inner peripheral surface and compresses the spring 2151a. As a result, a force is generated in the tangential L direction, and this force is a thrust force that causes the gear 30 to rotate and displace with the collet chuck 213 as the center, and causes the second positioning hole 32 to abut against the first surface 215b, thereby positioning in the rotational direction with respect to the gear 30.

[0057] In addition, in the present embodiment, although the ball plunger is illustrated as the thrust generator 2151, the type of the thrust generator 2151 is not particularly limited, and other types of plungers (such as pin plungers) may also be used. Further, it may be configured such that the direction of the force of the spring 2151a is parallel to the rotational axis direction of the gear 30, and the cam is used to change this force, thereby changing the direction of the thrust force to the tangential L direction.

[0058] As described above, during the grinding of the gear 30, the gear 30 and the threaded grinding wheel 13 are rotated together while grinding. Figure 8 This is also a diagram showing the rotational direction of the gear 30 and the direction of the machining load during the grinding. As Figure 8 shown, when the rotational direction of the gear 30 is the arrow A direction, a machining load in the opposite direction (arrow B direction) is applied to the gear 30.

[0059] That is, the machining load acts on the rotational direction positioning mechanism 215 through the second positioning hole 32. Therefore, the ball 2151b at the end position of the thrust generator 2151 provided in the rotational direction positioning mechanism 215 preferably faces the upstream side (downstream side of the machining load) in the rotational direction of the gear 30. In this way, when the machining load is received, the inner peripheral surface of the second positioning hole 32 of the gear 30 acts on the side that presses the first surface 215b of the main body 215a of the rotational direction positioning mechanism 215. Accordingly, during machining, no minute gap is generated between these two surfaces, and the positioning state in the rotational direction of the gear 30 can be reliably maintained.

[0060] In this way, as the positioning of the rotational direction of the gear 30, the rotational direction positioning mechanism 215 having the thrust generator 2151 is used. Thus, when the workpiece holding device 21 holds a plurality of gears 30, the positioning of each of the gears 30 with respect to the workpiece holding device 21 can be reliably performed. As a result, the gear grinding device 10 can improve the relative gear accuracy of a plurality of gears 30 that are simultaneously machined.

[0061] Figure 9(a) is an enlarged view Figure 4 and Figure 8 FIG. showing the rotational direction positioning mechanism 215 and its peripheral part. In this example, the imaginary circle C passes through the center O of the second positioning hole 32, and the tangent line L of this imaginary circle C is set such that the center O of the second positioning hole 32 is the tangent point P. The direction of the thrust of the thrust generator 2151 is made substantially consistent with this tangent line L. Accordingly, in the rotational direction positioning mechanism 215, the holding part of the thrust generator 2151 can be ensured relatively large, and thus the thrust generator 2151 can be stably held. On the side of the first face 215b of the rotational direction positioning mechanism 215, the first face 215b is formed so as to abut against the part of the inner peripheral surface of the second positioning hole 32 that intersects the tangent line L.

[0062] The direction of the thrust generator 2151 with respect to the second positioning hole 32 is configured to match the setting of the tangent line L. In Figure 9 the example shown in (b), it is set that: the tangent line L1 with the point where the imaginary circle C1 intersects the inner peripheral surface of the second positioning hole 32 as the tangent point P1. The direction of the thrust of the thrust generator 2151 is made substantially consistent with this tangent line L1. In addition, in Figure 9 the example of (b), the radius of the imaginary circle C1 is adjusted, and the tangent line L1 is set so as to pass through the center O of the second positioning hole 32, whereby the thrust generator 2151 can be held in the rotational direction positioning mechanism 215 with good balance.

[0063] In addition, on the side of the first face 215b of the rotational direction positioning mechanism 215 that can abut against the inner peripheral surface of the second positioning hole 32, it is set that: the tangent line L2 with the point where the inner peripheral surface of the second positioning hole 32 intersects the imaginary circle C1 as the tangent point P2. The first face 215b is formed so as to abut against the tangent point P2, whereby the rotational displacement when the second positioning hole 32 receives a thrust can be reliably withstood. In addition, in this example, although the first face 215b is formed as a stop surface whose width extends to the range of the tangent point P3 where the tangent line L intersects, as described above, it suffices to be formed with a width at least where the tangent point P2 abuts.

[0064] In addition, the expression "substantially consistent" described above does not mean that the direction of the thrust on the thrust generator 2151 is strictly consistent with the direction of the tangent line L (L1). For example, even if it is not consistent, as long as the direction of this thrust is the direction for causing the gear 30 to perform an action in the rotational direction, it is also included.

[0065] The embodiments disclosed this time are merely illustrative in all respects and are not a basis for restrictive interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiments, but is determined based on the description in the claims.

Claims

1. A gear processing device that processes a plurality of gears clamped in a stacked manner at the same time, It is characterized in that The gear is provided with: a first positioning hole located at a rotation center portion of the gear, and a second positioning hole located at a peripheral portion of the first positioning hole. The jig for holding the gear includes: a center axis positioning mechanism inserted into the first positioning hole, and a rotation direction positioning mechanism inserted into the second positioning hole. The rotation direction positioning mechanism comprises: a thrust generator abutting against the second positioning hole, The thrust of the thrust generator is directed in a direction substantially consistent with the direction of a tangent line on an imaginary circle centered on the first positioning hole and having the center of the second positioning hole as a tangent point, and the thrust generators acting on each of the plurality of gears are arranged along the length direction of the rotation direction positioning mechanism.

2. The gear processing device according to claim 1, characterized in that: The thrust generator is arranged on the rotation direction positioning mechanism so that the distal end thereof faces the upstream side in the rotation direction of the gear.

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