JP6627306B2 - Gear break-in processing device and gear reduction device manufacturing method - Google Patents

Description

  The present invention relates to a running-in device for a gear reduction device, a manufacturing method using the running-in device, and a gear reduction device manufactured by the running-in device.

  An electric power steering device for a vehicle includes an electric motor for assisting steering, and a gear reduction device for reducing the rotational force of the electric motor and transmitting the rotational force to a steering unit, and the steering unit according to an operation of a steering wheel. Is assisted by the rotation of the electric motor to reduce the burden on the driver for steering.

  The gear reduction device includes a worm connected to an output shaft of an electric motor, and a worm wheel that meshes with the worm and is connected to steering means (for example, Patent Document 1).

  The worm has a helical tooth integrally provided on an outer peripheral portion of a right cylindrical member made of a metal material. The worm is disposed so as to intersect with the axis of the worm wheel, and is disposed via a pair of first rolling bearings. Supported within the gear housing.

  On the other hand, the worm wheel is fitted and fixed to the rotating shaft of the steering means, and one end of the rotating shaft is supported by the sensor housing via a second rolling bearing, and the other end is supported by a third rolling bearing. It is supported within the gear housing.

  The worm wheel includes a synthetic resin material tooth portion having teeth formed on the outer side, and a metal holding portion that holds the tooth portion and is fitted to the rotation shaft of the steering means. The worm wheel is manufactured by forming a worm wheel body made of a highly rigid 66 nylon or PPS synthetic resin material around the holding portion by injection or the like, or a worm wheel body made of any synthetic resin material such as MC nylon. A plurality of teeth are formed by cutting the outside with a hob cutter.

  The worm wheel made of the synthetic resin material manufactured in this manner is liable to cause backlash at the meshing portion with the worm, and the rattling sound due to the backlash leaks into the interior of the automobile, so after the gear cutting process, A conforming process is performed that places a relatively high load on the teeth. (For example, see Patent Document 2)

  This running-in is performed by rotatably supporting the worm wheel body with an appropriate load, meshing the worm wheel body with one familiar tooth body having the same tooth profile as the worm, and rotating the familiar tooth body forward. The worm wheel body is driven to rotate by reverse rotation, a load is applied to the teeth of the worm wheel body, and the meshing portion between the teeth and the familiar tooth body is creeped (deformed) by a certain depth, The tooth surface is formed with a certain conforming depth so that the teeth can conform to the conformable tooth body.

  The gear housing in which the worm wheel and the worm are incorporated has a first support portion in which a pair of first rolling bearings are fitted and rotatably supports the worm, and the rotating shaft is provided in the second rolling bearing and the third rolling bearing. Supported, one end of which is supported by the sensor housing via a second rolling bearing, the other end of which is supported within the gear housing via a third rolling bearing, and which has a second support portion for rotatably supporting the worm wheel. ing. Therefore, when the electric power steering is completed, the gear housing and the sensor housing are integrated.

  The worm and the worm wheel of the gear reduction device are combined so that they cannot move in the radial direction.However, the processed worm, the worm wheel, and the gear housing have dimensional errors, so that the worm and the worm wheel cannot be moved. The magnitude of the backlash at the meshing portion varies. When the amount of backlash is large, rattling noise is generated at the time of steering, and the rattling noise leaks into the interior of the car, and when the amount of backlash is small, torque increases and the worm and worm wheel rotate smoothly. Therefore, the worm wheel, the worm, the gear housing, etc., which have been subjected to the working process, are sorted into a plurality of dimension groups with respect to the design dimensions, and a set of the worm wheel, the worm, and the gear housing are sorted out from the sorted dimension groups. By selecting and combining the distances between the worm wheel and the worm, the center distance between the worm wheel and the worm is within an allowable range.

JP 2002-67992 A JP-A-2002-257221

  However, the conventional gear reduction device is assembled by accumulating the measurement errors in the measurement of the worm wheel, the worm, and the gear housing. In this case, the problem that the backlash amount and the torque between products are not stable and affect the durability performance easily occurs.

  That is, in the running-in processing described in Patent Document 2, the running-in processing is performed by another worm and the worm wheel alone, and therefore, the running-in processing in an assembled state in consideration of an actual error is not performed.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a running-in processing apparatus for a gear reduction device capable of running-in processing in an actual use state. It is another object of the present invention to provide a gear reduction device manufactured by using the familiar processing device.

  To achieve the above object, the present invention provides a housing, a gear reduction device provided in the housing, an electric motor attached to the housing, an input shaft of the gear reduction device, and a gear reduction device. An electric power steering device having an output shaft for outputting a steering force, wherein the gear reduction device includes a worm and a worm wheel that meshes with the worm, and the worm can rotate through a pair of first rolling bearings. Wherein the worm wheel is fitted to the output shaft, and the gear reduction device is rotatably supported by the housing via a second rolling bearing and a third rolling bearing. One end of the output shaft fitted to the worm wheel is rotatably supported by the housing via a second rolling bearing. A support device having the other end engaged with the housing and rotatably supported by the housing by a fourth rolling bearing; a pressing mechanism for pressing the support device axially toward the worm wheel; The gist includes a load shaft connected to the output shaft that outputs a steering force of a reduction gear, a torque measuring unit that measures a load torque of the load shaft, and a load mechanism that applies a load torque.

  In the present invention, the gear reduction device equipped with a support device that rotatably supports the worm wheel, the gear reduction device has a running-in device, and the running-in process under high load conditions can be performed. A conforming device can be provided.

  Furthermore, in the invention described in claim 2, the support device is cylindrical, and a fourth rolling bearing supported on the output shaft via a spacer at one end is press-fitted, and the fourth end of the output shaft at the other end is press-fitted. The gist is that the output shaft is supported by the housing that supports the two rolling bearings, and the output shaft is rotatably pressed and fixed in the axial direction.

  According to the invention of claim 2, the supporting device has a cylindrical shape, and a bearing supported by a rotating shaft is press-fitted at one end and a bearing of the rotating shaft is supported at the other end. Since the work-in process can be performed and the support device can be attached and detached from one direction, the workability of the work-in process can be improved, and by changing the spacer, it is possible to provide a work-in processing device that can easily cope with gear reduction devices of various sizes. .

  Further, the invention according to claim 3 is a method for working-in a gear reduction device, characterized by including a step of giving a run-in to the worm wheel meshing with the worm. The gist is a manufacturing method using the familiar processing apparatus described in (1).

  Using a running-in processing device having a support device that supports the worm wheel of the gear reduction device, the running-in method of imparting the running-in to the worm wheel allows the running-in of the gear reduction device to be performed. Familiar processing of the reduction gear can be performed.

  Further, according to a fourth aspect of the present invention, the worm wheel meshed with the worm manufactured by the manufacturing method according to the third aspect by using the conforming processing device according to the first or second aspect. The gist of the present invention is that the gear reduction device is a gear reduction device manufactured by a conforming processing device such that the conforming depth in the tooth height direction of the tooth surface is formed to be 0.25 or more in the conforming depth ratio with respect to the maximum amount of change in the tooth surface. .

  Therefore, a worm wheel having excellent durability can be formed by forming the worm wheel so as to have a familiar depth ratio of 0.25 or more in an actual use state, and a gear reduction device incorporating the worm wheel can be provided.

  According to the above-described configuration, it is possible to provide a running-in device of a gear reduction device that can be run-in in a state of being actually used.By using the running-in device, a worm wheel having excellent durability can be obtained. An integrated gear reduction device can be provided.

FIG. 1 is a cross-sectional view of an electric power steering device incorporating a gear reduction device manufactured by a processing device according to the present invention. FIG. 1 is a schematic view of a conforming apparatus according to the present invention. The principal part enlarged view of FIG. The supporting apparatus figure used for the conforming processing apparatus which concerns on this invention. FIG. 5 is a cross-sectional view taken along the line ZZ of FIG. 4, showing a break-in process by the break-in processing device according to the present invention. 4 is a graph showing a relationship between a load time and a load torque by a conforming processing device. 5 is a graph showing the relationship between the load time and the amount of adaptation by the adaptation device. FIG. 5 is a cross-sectional view taken along the line ZZ of FIG. 4 is a graph showing tooth surface changes due to a durability test of a product subjected to conforming processing.

  Hereinafter, the present invention will be described in detail with reference to the drawings showing the embodiments. FIG. 1 is a sectional view of an electric power steering device in which a product processed by a processing device according to the present invention is incorporated and used. The electric power steering device has a first steering shaft 2 having an upper end connected to a steering wheel 1 for steering and having a tubular portion at a lower end, and an upper end inserted into the tubular portion and having an upper end connected to the first steering shaft 2. A torsion bar 3 coaxially connected to a lower end and twisted by the action of a steering torque applied to the steering wheel 1, a second steering shaft 4 having a lower end coaxially connected to a lower end of the torsion bar 3, A torque sensor 5 for detecting a steering torque applied to the steering wheel 1 based on a relative rotational displacement of the first and second steering shafts 2 and 4 according to the torsion of the torsion bar 3, and a torque detected by the torque sensor 5; And a driving gear (hereinafter referred to as a wheel) that is driven based on the steering assist motor 6 and that is interlocked with the rotation of the motor 6 to reduce the rotation and transmit it to the second steering shaft 4. And a housing 8 in which the torque sensor 5 and the gear reduction device 7 are accommodated. The housing 8 accommodates the motor 6 Is installed.

  The housing 8 includes a sensor housing 8d having a first housing portion 8a for housing the torque sensor 5, a second housing portion 8b continuous with the housing portion 8a and housing the worm wheel 24, and a housing housing 8d. The gear housing 8e includes a third housing portion 8c that is continuous with the worm 9 and that is continuous with the worm 9. The sensor housing 8d and the gear housing 8e are connected and fixed by bolts b.

  The gear reduction device 7 includes a worm 9 having a shaft connected to a rotation shaft of the motor 6 via a joint, and a worm wheel 24 made of synthetic resin fitted and fixed at an intermediate position between the second steering shaft 4. The rotation of the rotating shaft is reduced by the engagement of the worm 9 and the worm wheel 24 and transmitted to the second steering shaft 4 (the output shaft of the gear reduction device 7). Through a universal joint to a rack and pinion type steering mechanism (not shown).

  The worm 9 is rotatably supported by a third housing portion 8c via shafts at both ends via a pair of first rolling bearings (not shown). The worm wheel 24 is mounted on the second housing portion 8b. The second steering shaft 4 at one end is rotatably supported by the sensor housing 8d via a third rolling bearing 26 on the torque sensor 5 side, and the second steering shaft 4 at the other end is opposite to the torque sensor 5 on the opposite side. It is rotatably supported by the gear housing 8e via the second rolling bearing 25.

  The worm wheel 24 includes a synthetic resin annular tooth body 24 a having a plurality of teeth meshing with the worm 9 on the outside, and a metal holding body 24 b holding the annular tooth body 24 a. A through hole formed in the center of 24b is fitted to the second steering shaft 4.

  The running-in processing device 10 according to the present invention is a running-in processing device 10 that forms a tooth surface by running-in a synthetic resin-made annular tooth body 24a having a plurality of teeth that mesh with the worm 9 of the worm wheel 24 on the outside.

  Next, the conforming processing device 10 according to the present invention will be described in detail with reference to FIG.

  The conforming device 10 shown in FIG. 2 includes a lower support 11, a pair of supports 13 erected vertically in the lower support 11, and an upper support fixed to the upper portion of the pair of supports 13. 14, a pressing mechanism A provided on the upper receiving base 14 and the lower receiving base 11, a load mechanism B on the lower receiving base 11, a driving mechanism C of the gear reduction device 7, and the reduction gear 7 can be rotated. And a supporting device 30 provided in the pressing mechanism A for pressing the supporting device 30.

  The pressing mechanism A has a hydraulic cylinder device 20 (fluid pressure cylinder device) fixed to the upper surface of the upper receiving stand 14, and a load cell 19 coupled to a tip of a piston rod 21 of the hydraulic cylinder device 20. I have.

  The load mechanism B includes a load shaft 18 connected to the gear reduction device 7, a torque detector 17, and a load motor 15.

  The drive mechanism C has a drive motor 6 connected to a gear reduction device 7. The drive motor 6 measures the load torque by the torque detection unit 17 and controls the load torque applied to the load shaft 18.

  Next, the support device 30 of the conforming device 10 according to one embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a sectional view of the support device 30. FIG. 4 is a sectional view in which the support device 30 of FIG. FIG. 5 is a cross-sectional view taken along the line ZZ in FIG. 4, showing the working-in of the worm wheel 24 by the working-in processing apparatus 10 according to the present invention.

  The support device 30 includes a cylindrical fixing jig 31 having one end engaged with the gear housing 8, a fourth rolling bearing 32 rotatably supporting the second steering shaft 4 at the other end of the fixing jig 31, It has a collar 33 that is engaged between and supports the fourth rolling bearing 32 and the second steering shaft 4, and a pressing plate 34 that presses the end face of the fixing jig 31 in the axial direction via the fourth rolling bearing 32. .

  As shown in FIG. 4, the fixing jig 31 has, at one end, an engaging portion 31a that engages with the end 8f of the gear housing 8e. That is, the engaging portion 31a forms a step portion having an outer diameter smaller than the outer diameter of the outer periphery of the fixing jig 31, and slidably engages with the inner diameter of the end 8f of the gear housing 8e. The gear housing 8e and the support device 30 are fixed by contacting the end face of the end 8f of the gear housing 8e and the end face of the outer ring of the second rolling bearing 25. A fourth rolling bearing 32 that rotatably supports the second steering shaft 4 via a collar 33 is fitted to the other end.

  The inner diameter of the collar 33 is made slightly larger than the diameter of the steering shaft 4, and a tapered portion having an angle α is provided at the end of the steering shaft 4 so as to guide the second steering shaft 4, and the support device 30 is moved to the second position. The structure is easy to attach to the steering shaft 4. By installing the collar 33 on the inner ring of the fourth rolling bearing 32, it is possible to adjust to the second steering shaft 4 of various sizes.

  In the invention having the above configuration, since the gear reduction device 7 provided with the support device 30 can be used for the gear reduction device 7, the gear reduction device 7 can be used in the actual use state. 10 can be provided.

  Further, according to the present invention, the support device 30 is cylindrical, and a fourth rolling bearing 32 supported by the second steering shaft 4 is press-fitted at one end and a bearing 25 of the second steering shaft 4 is mounted at the other end. The second steering shaft 4 is rotatably pressed and fixed. Therefore, the support device 30 is cylindrical, and the fourth rolling bearing 32 supported by the second steering shaft 4 is press-fitted at one end, and the collar 33 is mounted on the inner ring of the fourth rolling bearing 32, and the other end is mounted on the other end. Since the structure for supporting the bearing 25 of the second steering shaft 4 allows the support device 30 to be attached and detached from one direction, the workability of conforming processing is improved. It is possible to provide the conforming processing device 10 that can easily cope with the gear reduction device 7 having a size.

  Furthermore, the running-in processing device 10 of the gear reduction device 7 including the support device 30 can perform the running-in process of the gear reduction device 7 under a high load condition, so that the running-in process of the gear reduction device 7 can be performed in a state of being actually used.

  Then, the gear reduction device 7 is adapted to the worm wheel 24 manufactured as shown in FIG. 5 by the manufacturing method using the adaptation device 10. Therefore, it is possible to provide the gear reduction device 10 that can be used in actual use.

  Next, the operation of the gear reduction device 7 will be described with reference to FIG.

  The embodiment of the running-in device 10 of the present invention is a case where the running-in process is performed using the gear reduction device 7. First, the drive motor 6 is mounted with the gear reduction device 7 incorporated in the gear housing 8e, and the housing 8e is attached to the groove 12a provided on the mounting table 12. At the same time, the male spline portion 18a formed at the tip of the load shaft 18 of the load device B is inserted into and engaged with the female spline portion 4a formed on the second steering shaft 4.

  The second steering shaft 4 is inserted into the collar 33 of the support device 30, and the engaging portion 31 a of the fixing jig 31 is engaged with the end 8 f of the gear housing 8 e to attach the support device 30. Then, the hydraulic cylinder 21 of the pressing mechanism 21 of the running-in processing device 10 is lowered and brought into contact with the pressing plate 33 of the supporting device 30, and the supporting device 30 moves in the axial direction and during the running-in of the pressing load while measuring the load of the load cell 19. Adjust to the set value so that it does not move in the radial direction.

  The drive motor 6 of the drive mechanism C is operated to rotate the worm 9, and at the same time, the servo motor 15 of the load mechanism B is operated to fit the second steering shaft 4 to be loaded via the torque measuring unit 17. The worm 9 and the worm wheel 24 rotate while a load is generated at the meshing portion between the worm wheel 24 and the worm 9. After a certain time, the driving motor 6 of the driving mechanism C is rotated in the reverse direction, and at the same time, the servo motor 15 is rotated in the reverse direction to generate a load. By doing so, the tooth surfaces are formed in the meshing portions on both surfaces of the worm 7 and the worm wheel 24 by running-in processing in forward and reverse rotation.

  As shown in FIG. 5, the tooth surface forming portions 24c and 24d formed on the meshing portions on both surfaces of the worm wheel 24 have an elliptical shape or an arc shape that is long in the tooth streak direction at the meshing portion, and have a conforming depth in the tooth height direction cross section. S (hereinafter referred to as a familiar amount S) has an arc shape. The measurement of the conforming amount S can be measured by tracing the meshing portion of the worm wheel 24 in the tooth height direction with a contact type shape measuring instrument.

  When the torque of the torque measuring unit 17 is set to the set value Tm and the motor rotates in the normal and reverse directions for a certain time tn, the adaptation processing is completed, the hydraulic cylinder 21 of the pressing mechanism A is raised, the support device 30 is removed, and the gear reduction device 7 adapts. Processing is complete.

  Next, an embodiment in which the gear reduction device 7 is developed using the conforming device 10 will be described with reference to FIGS.

(Preparation of sample of gear reduction device 7 in which adaptation amount S of worm wheel 24 was changed)
FIG. 6 shows the relationship between the load time t and the load torque T using the developed conforming device 10. The horizontal axis indicates the load time t, the vertical axis indicates the load torque T, and the curve K indicates the time change of the load torque T. The time tn at which the load torque Tm stabilizes is the time when the load is actually applied.

  FIG. 7 shows the relationship between the load time t and the change in the adaptation amount S due to the adaptation processing. The load time tn shown in FIG. 6 is shown on the horizontal axis, the familiarity S is shown on the vertical axis, the straight line H shows the change in the familiarity S when the load torque Tm is loaded, and the necessary familiarity conditions are set from FIG. I can do it.

  By changing the load time t shown in FIG. 7 and changing the amount of adaptation S to four kinds of adaptation conditions shown in FIG. 9, samples were produced. That is, assuming that the maximum value of the tooth surface change amount Y0 of the worm wheel 24 of the gear reduction device 7 of the electric power steering device that has been operated until the end of the life in the durability test is 1, the familiarity ratio s of the ratio with the familiarity S is 0.05. , 0.1, 0.25 and 0.35 were prepared.

(Examination of durability)
A durability test is performed by using the electric power steering apparatus shown in FIG. 1 to determine the number of cycles until the worm wheel body 24 is broken during direct rotation and reverse rotation under a high load equal to the stationary steering mode of the front wheels of the automobile. Under the conditions, the durability test was performed up to the number of cycles for evaluating the durability. At that time, the tooth surface change amount Y of the worm wheel 24 was measured. FIG. 8 is a sectional view taken along the line ZZ in FIG. 4 showing the tooth surface variation Y after the durability test of the conformed product. FIG. 9 is a tooth surface variation Y of the conformity of the conformity product in the durability test. Figure 2 shows a graph of the effect on

  FIG. 9 shows the relationship between the tooth flank change amounts in the durability test when the conforming process is performed. In addition, the wear amount X after the durability test shown in FIG. 8 was calculated by subtracting the familiar amount S previously formed by the familiarization process from the tooth surface change amount Y after the durability test. The abscissa represents the running-in amount ratio s (the ratio to the running-in amount S when the maximum tooth flank change Y0 is 1: S / Y0), and the vertical axis represents the wear amount ratio x (maximum tooth flank change) after the durability test. The ratio of the wear amount x when the amount Y0 is set to 1 is represented by a bar graph, and the tooth surface change ratio y (the wear amount ratio x when the maximum tooth surface change amount Y0 is set to 1 + the running-in amount ratio s) is represented by a bar graph. This is indicated by a line graph L.

  As shown in FIG. 9, it can be seen that when the conforming amount ratio s is increased by the conforming process, the wear amount ratio x decreases. Then, the total tooth surface change ratio y of the wear amount ratio x and the familiarity ratio s of the curve L decreases to the familiarity ratio s of 0.25 or more. However, the tooth surface change amount ratio y is saturated from 0.25 to 0.35, and therefore, it has been found that the tooth surface change amount Y becomes the smallest when the adaptation amount ratio s is set to 0.25 or more at the beginning. .

  This is because the surface roughness of the tooth surface forming portions 24c and 24d formed on the meshing portion on both surfaces is reduced by the running-in process, the friction torque is easily stabilized, and the amount of the tooth surface forming portions 24c and 24d is adjusted. It is considered that, by increasing the ratio s, the larger the actual contact area at the time of meshing is, the smaller the surface pressure is, which is a reason why the wear amount ratio is reduced. Even if the running-in amount ratio s is further increased to 0.25 or more in the initial stage, the contact area of the tooth surface forming portions 24c and 24d does not become so large with respect to the increase in the wear amount ratio x, so that the surface pressure during meshing is not so large. It is considered that the reason for this is that the change in the tooth surface change amount ratio y is reduced by not reducing.

  Therefore, using the conforming device 10, the conformation depth of the tooth surface is formed in the worm wheel 24 manufactured by the conformation method at a conformation depth ratio of 0.25 or more with respect to the maximum tooth surface change amount Y0. By forming the worm wheel 24 having the tooth surface formed by the familiar processing as described above, the worm wheel 24 having excellent durability and having the smallest tooth surface change amount Y in the durability test can be obtained, and the durability incorporating the worm wheel 24 can be obtained. The gear reduction device 7 having excellent characteristics can be provided.

  The present invention is not limited to such embodiments at all, and it is needless to say that the present invention can be implemented in various modes without departing from the gist of the present invention.

  In the above embodiment, the present invention is applied to the column assist type EPS. However, the present invention is not limited to this. The present invention can be applied to other EPSs as long as the rotation of the motor is transmitted to the steering system via the speed reduction mechanism. It is. More specifically, a pinion assist type EPS that rotates the pinion shaft, a so-called rack parallel type EPS in which the motor is arranged parallel to the rack axis, or a motor driven separately from the pinion shaft that rotates by steering operation The present invention may be applied to a so-called double pinion type EPS having a pinion shaft.

1: steering wheel, 2: first steering shaft (input shaft), 4: second steering shaft (output shaft), 6: drive motor, 7: gear reduction device, 8: housing, 8a: first housing Part, 8b: second storage part, 8c: third storage part, 8d: sensor housing, 8e: gear housing, 9: worm, 10: conforming processing device, 11: lower receiving stand, 12: mounting table, 13: a pair of pillars, 14: upper support, 15: load motor, 17: torque detector, 18: load shaft, 21: piston, 24: worm wheel, 25: second rolling bearing, 26: third rolling Bearing, 30: support device, 31: fixed part, 32: fourth rolling bearing, 33: collar (spacer), 34: pressing plate, 39: driving device (servo motor), A: pressing mechanism, B: load mechanism, C Drive mechanism, S: familiar weight (familiar depth), Y: tooth surface variation

Claims (3)

A housing,
A gear reduction device having a worm rotatably supported in the housing via a pair of first rolling bearings, and a worm wheel provided in the housing and meshing with the worm;
A drive motor attached to the housing to rotate the worm;
An input shaft of the gear reduction device;
An output shaft fitted to the worm wheel and one end rotatably supported by the housing via a second rolling bearing and outputting a steering force of the gear reduction device. A familiarity processing device for imparting familiarity to the wheel,
A supporting device having a fixing jig engaged with the housing, and a fourth rolling bearing for rotatably supporting the other end of the output shaft on the fixing jig;
A pressing mechanism that presses the support device toward the worm wheel in the axial direction of the output shaft,
A load shaft connected to the output shaft that outputs a steering force of the gear reduction device;
A torque measuring unit that measures a load torque of the load shaft,
And a load mechanism for applying a load torque to the load shaft. The fixing jig is formed in a cylindrical shape, and the fourth rolling bearing that rotatably supports the output shaft via a spacer at one end of the fixing jig is press-fitted, and the other end of the fixing jig is The housing is engaged,
The running-in device of the gear reduction device according to claim 1, wherein the support device further includes a pressing plate provided at the one end of the fixing jig to press and fix the output shaft rotatably in the axial direction. A method of manufacturing a gear reduction device, comprising a step of using the familiarization processing device according to claim 1 or 2 to impart a familiarity to the worm wheel that meshes with the worm of the gear reduction device.

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