WO2020013131A1

WO2020013131A1 - Speed reducer, and motor with speed reducer

Info

Publication number: WO2020013131A1
Application number: PCT/JP2019/027008
Authority: WO
Inventors: 眞人坂井; 和樹丸尾; 友騎山下; 文啓清水; 岡田　浩幸
Original assignee: 株式会社デンソー
Priority date: 2018-07-13
Filing date: 2019-07-08
Publication date: 2020-01-16
Also published as: DE112019003566B4; DE112019003566T5

Abstract

This speed reducer is provided with: a first gear rotated by rotational force transmitted thereto; an eccentric shaft joined to the first gear and having a first support section and a second support section, which are offset in a rotational radial direction relative to the rotating shaft of the first gear; a stationary gear disposed radially outside the eccentric shaft and prevented from rotating; a transmission gear which is supported by the first support section, meshes with the stationary gear, and revolves around the rotating shaft of the first gear and rotates as the first gear rotates with the eccentric shaft; an output section rotating as the transmission gear revolves and rotates; and a locking gear which is supported by the second support section, meshes with the stationary gear, revolves around the rotating shaft of the first gear and rotates as the first gear rotates with the eccentric shaft, and prevents the rotation of the output section when restrained from revolving and rotating.

Description

Reduction gear and motor with reduction gear

The present disclosure relates to a speed reducer and a motor with a speed reducer.

JP-A-2018-80791 discloses a motor with a speed reducer provided with a speed reducer for reducing the rotation of the motor. The reduction gear described in Japanese Patent Application Laid-Open No. 2018-80791 revolves with a worm fixed to a rotating shaft of a motor, a worm wheel meshing with the worm, and a state in which rotation is restricted by rotation of the worm wheel. A rotating body; and an output shaft that rotates by transmitting a torque generated by the revolution of the rotating body. A stopper mechanism is provided between the rotating body and the output shaft. The stopper mechanism includes a driving gear (second gear) for transmitting a rotational force to the output shaft, and a stopper member. When the projection provided on the driving gear contacts the projection provided on the stopper member, the rotation of the driving gear is regulated, and the rotation amount (rotation angle) of the output shaft becomes a predetermined rotation amount. Is restricted to

The reduction gear described in Japanese Patent Application Laid-Open No. 2018-80791 is useful from the viewpoint of reducing the rotation of the output shaft and the like of the motor at a high reduction ratio and limiting the rotation amount of the output unit (output shaft) to a predetermined rotation amount. It is a simple configuration. However, further reduction in the size of the speed reducer and the motor provided with the speed reducer is desired from the viewpoint of mountability on a vehicle and the like. In the configuration of the speed reducer described in Japanese Patent Application Laid-Open No. 2018-80791, the rotation amount of the output unit (output shaft) is limited to less than one rotation.

The present disclosure provides a speed reducer and a motor with a speed reducer that can be downsized.
Further, the present disclosure provides a speed reducer and a motor with a speed reducer that can limit the amount of rotation of the output unit from less than one rotation to one or more rotations.

A first aspect of the present disclosure is a speed reducer, wherein a first gear that rotates by transmitting a rotational force is coupled to the first gear, and has a rotation diameter with respect to a rotation axis of the first gear. An eccentric shaft having a first support portion and a second support portion that are offset in a direction, a fixed gear that is disposed radially outside of the eccentric shaft and whose rotation is restricted, and that is supported by the first support portion. And a transmission gear that meshes with the fixed gear and revolves around the rotation axis of the first gear and rotates by rotating the first gear together with the eccentric shaft; and the transmission gear revolves and rotates. The rotation of the output unit, the second gear is supported by the second support and meshes with the fixed gear, and the first gear rotates together with the eccentric shaft to rotate around the rotation axis of the first gear. Revolves and rotates, and its revolution and rotation are By being provided with a lock gear to which the rotation of the output portion is restricted.

According to the speed reducer of the first aspect, when the torque is transmitted to the first gear, the first gear rotates together with the eccentric shaft. Thus, the transmission gear supported by the first support portion of the eccentric shaft revolves and rotates while meshing with the fixed gear. Further, when the transmission gear revolves and rotates, the output unit rotates. That is, the rotation transmitted to the first gear is reduced by the transmission gear and the fixed gear and transmitted to the output unit. When the first gear rotates together with the eccentric shaft, the locking gear supported by the second support portion of the eccentric shaft revolves and rotates while meshing with the fixed gear. When the revolution and rotation of the lock gear are restricted, the rotation of the output unit is restricted. This limits the amount of rotation of the output unit. Here, in the speed reducer of the first aspect, both the lock gear for limiting the rotation amount of the output unit and the transmission gear for transmitting the rotational force to the output unit are configured to mesh with the fixed gear. Has become. Accordingly, the size of the speed reducer according to the first aspect can be reduced as compared with the case where the lock gear and the transmission gear mesh with different fixed gears.

According to a second aspect of the present disclosure, in the first aspect, the transmission gear and the locking gear may be arranged adjacent to and in contact with each other in a rotation axis direction of the first gear. .

According to the speed reducer of the second aspect, the transmission gear and the lock gear are arranged adjacent to and in contact with each other in the rotation axis direction of the first gear, so that the first gear in the speed reducer is provided. Can be downsized in the rotation axis direction.

According to a third aspect of the present disclosure, in the above aspect, the fixed gear is provided with an abutting portion with which a part of the locking gear abuts. By contacting the contact portion, the rotation and rotation of the lock gear may be restricted.

According to the speed reducer of the third aspect, the fixed gear is provided with the abutted portion that restricts the rotation and rotation of the lock gear. Thus, the reduction gear of the third aspect suppresses a complicated configuration of the reduction gear as compared with the case where the abutted portion for restricting the rotation and rotation of the locking gear is provided separately from the fixed gear. it can.

According to a fourth aspect of the present disclosure, in the above aspect, one of the transmission gear and the output unit is provided with a convex portion that protrudes in a rotation axis direction of the output unit, and the transmission gear and the output unit The other is provided with a concave portion in which the convex portion is engaged with a clearance, and the transmission gear revolves and rotates in a state where the convex portion and the concave portion are engaged with each other, whereby the The output unit may rotate.

According to the fourth aspect of the speed reducer, the transmission of the rotational force from the transmission gear to the output portion is performed through the convex portion and the concave portion. Thus, in the speed reducer according to the fourth aspect, the configuration of the transmission gear and the output unit can be simplified as compared with the case where the torque is transmitted from the transmission gear to the output unit by the gear.

A fifth aspect of the present disclosure is a speed reducer, wherein a first gear that rotates by transmitting a rotational force, is coupled to the first gear, and has a rotation diameter with respect to a rotation axis of the first gear. An eccentric shaft having a first support portion and a second support portion that are offset in a direction, a fixed gear that is disposed radially outside of the eccentric shaft and whose rotation is restricted, and that is supported by the first support portion. And a transmission gear that meshes with the fixed gear and revolves around the rotation axis of the first gear and rotates by rotating the first gear together with the eccentric shaft; and the transmission gear revolves and rotates. The rotation of the output unit, the second gear is supported by the second support and meshes with the fixed gear, and the first gear rotates together with the eccentric shaft to rotate around the rotation axis of the first gear. Revolves and rotates, and its revolution and rotation are As a result, the locking gear whose rotation of the output portion is restricted, the first regulating portion provided on the locking gear, and the first regulating portion abut on each other, so that the rotation of the locking gear revolves. And a second restricting portion whose rotation is restricted.

According to the fifth aspect of the speed reducer, when the torque is transmitted to the first gear, the first gear rotates together with the eccentric shaft. Thus, the transmission gear supported by the first support portion of the eccentric shaft revolves and rotates while meshing with the fixed gear. Further, when the transmission gear revolves and rotates, the output unit rotates. That is, the rotation transmitted to the first gear is reduced by the transmission gear and the fixed gear and transmitted to the output unit. When the first gear rotates together with the eccentric shaft, the locking gear supported by the second support portion of the eccentric shaft revolves and rotates while meshing with the fixed gear. Then, when the first regulating portion of the locking gear contacts the second regulating portion and the revolution and rotation of the locking gear are restrained, the rotation of the output portion is regulated. This limits the amount of rotation of the output unit. Here, in the speed reducer according to the fifth aspect, a lock gear for limiting the rotation amount of the output unit is provided separately from a transmission gear for transmitting the rotational force to the output unit. Accordingly, the speed reducer according to the fifth aspect reduces the rotation amount of the output portion from less than one rotation to one or more rotations without being restricted by the restriction of the relationship between the transmission gear and the output portion. Can be restricted.

In a sixth aspect of the present disclosure, in the fifth aspect, the number of teeth of the lock gear may be set to be greater than the number of teeth of the transmission gear.

According to the speed reducer of the sixth aspect, the number of teeth of the lock gear is set to be greater than the number of teeth of the transmission gear. Thereby, the rotation speed of the lock gear when the first gear rotates can be made lower than the rotation speed of the transmission gear. Thereby, as compared with the case where the number of teeth of the locking gear is set to be smaller than the number of teeth of the transmission gear, the time until the first restricting portion of the locking gear contacts the second restricting portion is reduced. The number of rotations of the output unit can be increased. As a result, the speed reducer according to the sixth aspect can easily limit the rotation amount of the output unit to one or more rotation amounts.

According to a seventh aspect of the present disclosure, in the fifth aspect, the number of teeth of the lock gear may be set to be smaller than the number of teeth of the transmission gear.

According to the speed reducer of the seventh aspect, the number of teeth of the lock gear is set to be smaller than the number of teeth of the transmission gear. Thereby, the rotation speed of the lock gear when the first gear rotates can be made higher than the rotation speed of the transmission gear. Thereby, compared with the case where the number of teeth of the lock gear is set to be larger than the number of teeth of the transmission gear, the time until the first restricting portion of the locking gear comes into contact with the second restricting portion. The number of rotations of the output unit can be reduced. As a result, the speed reducer of the seventh aspect can easily limit the rotation amount of the output unit to a rotation amount of less than one rotation.

According to an eighth aspect of the present disclosure, in the fifth aspect to the seventh aspect, the fixed gear is provided with the second regulating portion, and the first regulating portion, the second regulating portion, However, the second support portion may abut on a side offset with respect to the rotation axis of the first gear.

According to the speed reducer of the eighth aspect, when the first restricting portion of the locking gear contacts the second restricting portion of the fixed gear, and the revolution and rotation of the locking gear are restrained, the rotation of the output portion is reduced. Be regulated. Here, the first restricting portion and the second restricting portion abut on the side where the second support portion is offset with respect to the rotation shaft of the first gear. Thus, in the speed reducer according to the eighth aspect, a contact area between the first restricting portion and the second restricting portion can be easily secured.

A ninth aspect of the present disclosure is a motor with a reduction gear, which is coupled to a motor having a rotating shaft, a first gear that rotates by transmitting a rotating force of the rotating shaft, and the first gear. An eccentric shaft having a first support portion and a second support portion that are offset in the radial direction with respect to the rotation shaft of the first gear; and the eccentric shaft is disposed radially outside of the eccentric shaft, and its rotation is restricted. A fixed gear is supported by the first support portion and meshes with the fixed gear, and the first gear rotates with the eccentric shaft to revolve around the rotation axis of the first gear and rotate. A transmission gear, an output portion that rotates as the transmission gear revolves and rotates, and is supported by the second support portion and meshes with the fixed gear, so that the first gear rotates with the eccentric shaft. Around the rotation axis of the first gear And rotating while revolving, by the revolution and rotation is restrained, and a lock gear to which the rotation of the output portion is restricted.

According to the ninth aspect of the motor with speed reducer, when the torque of the rotating shaft of the motor is transmitted to the first gear, the first gear rotates together with the eccentric shaft. Thus, the transmission gear supported by the first support portion of the eccentric shaft revolves and rotates while meshing with the fixed gear. Further, when the transmission gear revolves and rotates, the output unit rotates. That is, the rotation transmitted to the first gear is reduced by the transmission gear and the fixed gear and transmitted to the output unit. When the first gear rotates together with the eccentric shaft, the locking gear supported by the second support portion of the eccentric shaft revolves and rotates while meshing with the fixed gear. When the revolution and rotation of the lock gear are restricted, the rotation of the output unit is restricted. This limits the amount of rotation of the output unit. Here, in the speed reducer according to the ninth aspect, both the lock gear for limiting the amount of rotation of the output section and the transmission gear for transmitting the rotational force to the output section mesh with the fixed gear. Has become. Thus, the size of the speed reducer can be reduced as compared with the case where the lock gear and the transmission gear mesh with different fixed gears. As a result, the motor with a speed reducer according to the ninth aspect can reduce the size of the motor with the speed reducer provided with the speed reducer.

According to a tenth aspect of the present disclosure, in the ninth aspect, the transmission gear and the lock gear are arranged adjacent to and in contact with each other in a rotation axis direction of the first gear. Good.

According to the motor with reduction gear of the tenth aspect, the transmission gear and the lock gear are arranged adjacent to and in contact with each other in the direction of the rotation axis of the first gear, so that the motor with reduction gear is provided. Can be downsized in the rotation axis direction of the first gear.

According to an eleventh aspect of the present disclosure, in the ninth aspect or the tenth aspect, the fixed gear is provided with an abutted portion with which a part of the locking gear abuts. The rotation and rotation of the lock gear may be restricted by contacting a part of the lock gear with the contacted portion.

According to the eleventh aspect of the motor with a speed reducer, the fixed gear is provided with the abutted portion that regulates the rotation and rotation of the lock gear. Thus, the configuration of the speed reducer can be suppressed from becoming complicated as compared with the case where the abutted portion that regulates the revolution and rotation of the lock gear is provided separately from the fixed gear. As a result, the motor with a speed reducer according to the eleventh aspect can prevent the configuration of the motor with a speed reducer from being complicated.

According to a twelfth aspect of the present disclosure, in the ninth aspect to the eleventh aspect, one of the transmission gear and the output portion is provided with a convex portion that protrudes in a rotation axis direction of the output portion, The other of the transmission gear and the output portion is provided with a concave portion in which the convex portion is engaged with a clearance, and the transmission gear revolves when the convex portion and the concave portion are engaged. The output unit may be rotated by the rotation.

According to the twelfth aspect of the motor with a speed reducer, the transmission of the rotational force from the transmission gear to the output portion is performed through the convex portion and the concave portion. Thus, in the motor with a speed reducer according to the twelfth aspect, the configuration of the transmission gear and the output unit can be simplified as compared with the case where the torque is transmitted from the transmission gear to the output unit by the gear.

A thirteenth aspect of the present disclosure is a motor with a speed reducer, the motor having a rotating shaft, a first gear that rotates by transmitting a rotating force of the rotating shaft, and a first gear that is coupled to the first gear. An eccentric shaft having a first support portion and a second support portion that are offset in the radial direction with respect to the rotation shaft of the first gear; and the eccentric shaft is disposed radially outside of the eccentric shaft, and its rotation is restricted. A fixed gear is supported by the first support portion and meshes with the fixed gear, and the first gear rotates with the eccentric shaft to revolve around the rotation axis of the first gear and rotate. A transmission gear, an output portion that rotates as the transmission gear revolves and rotates, and is supported by the second support portion and meshes with the fixed gear, so that the first gear rotates with the eccentric shaft. The circumference of the rotation shaft of the first gear. And a rotation gear, and the rotation of the output portion is restricted by restricting the rotation and the rotation, a first regulating portion provided on the locking gear, and the first regulating portion. A second restricting portion that restricts the revolution and rotation of the lock gear when the portions come into contact with each other.

According to the thirteenth aspect of the motor with speed reducer, when the torque of the rotating shaft of the motor is transmitted to the first gear, the first gear rotates together with the eccentric shaft. Thus, the transmission gear supported by the first support portion of the eccentric shaft revolves and rotates while meshing with the fixed gear. Further, when the transmission gear revolves and rotates, the output unit rotates. That is, the rotation transmitted to the first gear is reduced by the transmission gear and the fixed gear and transmitted to the output unit. When the first gear rotates together with the eccentric shaft, the locking gear supported by the second support portion of the eccentric shaft revolves and rotates while meshing with the fixed gear. Then, when the first regulating portion of the locking gear contacts the second regulating portion and the revolution and rotation of the locking gear are restrained, the rotation of the output portion is regulated. This limits the amount of rotation of the output unit. Here, in the speed reducer according to the thirteenth aspect, a lock gear for limiting the rotation amount of the output unit is provided separately from a transmission gear for transmitting the rotational force to the output unit. Accordingly, the speed reducer according to the thirteenth aspect can reduce the rotation amount of the output portion from less than one rotation to one or more rotations without being restricted by the restriction of the relationship between the transmission gear and the output portion. Can be restricted.

According to a fourteenth aspect of the present disclosure, in the thirteenth aspect, the number of teeth of the lock gear may be set to be greater than the number of teeth of the transmission gear.

According to the fourteenth aspect, the number of teeth of the lock gear is set to be greater than the number of teeth of the transmission gear. Thereby, the rotation speed of the lock gear when the first gear rotates can be made lower than the rotation speed of the transmission gear. Thereby, as compared with the case where the number of teeth of the locking gear is set to be smaller than the number of teeth of the transmission gear, the time until the first restricting portion of the locking gear contacts the second restricting portion is reduced. The number of rotations of the output unit can be increased. As a result, the motor with a speed reducer according to the fourteenth aspect can easily limit the rotation amount of the output unit to one or more rotation amounts.

According to a fifteenth aspect of the present disclosure, in the thirteenth aspect, the number of teeth of the lock gear may be set to be smaller than the number of teeth of the transmission gear.

According to the fifteenth aspect, the number of teeth of the lock gear is set to be smaller than the number of teeth of the transmission gear. Thereby, the rotation speed of the lock gear when the first gear rotates can be made higher than the rotation speed of the transmission gear. Thereby, compared with the case where the number of teeth of the lock gear is set to be larger than the number of teeth of the transmission gear, the time until the first restricting portion of the locking gear comes into contact with the second restricting portion. The number of rotations of the output unit can be reduced. As a result, the motor with a speed reducer according to the fifteenth aspect can easily limit the rotation amount of the output unit to a rotation amount of less than one rotation.

According to a sixteenth aspect of the present disclosure, in the thirteenth aspect to the fifteenth aspect, the fixed gear is provided with the second regulating part, and the first regulating part, the second regulating part, However, the second support portion may abut on a side offset with respect to the rotation axis of the first gear.

According to the motor with a speed reducer of the sixteenth aspect, when the first restricting portion of the locking gear comes into contact with the second restricting portion of the fixed gear, and the revolution and rotation of the locking gear are restrained, the output portion of the locking portion is stopped. Rotation is regulated. Here, the first restricting portion and the second restricting portion abut on the side where the second support portion is offset with respect to the rotation shaft of the first gear. Thus, the motor with a speed reducer according to the sixteenth aspect can easily ensure a contact area between the first restricting portion and the second restricting portion.

A seventeenth aspect of the present disclosure is a speed reducer, wherein a first gear that rotates by transmitting a rotational force, is coupled to the first gear, and has a rotation diameter with respect to a rotation axis of the first gear. An eccentric shaft having a first support portion and a second support portion offset in a direction, a fixed gear disposed radially outside of the eccentric shaft, the rotation of which is restricted, and a portion of the fixed gear; The rotation-restricting member is supported by the first support portion, the rotation is restricted by being engaged with the rotation-restricting member, and the first gear rotates together with the eccentric shaft. A transmission gear that revolves around a rotation axis, an output unit that rotates by revolving the transmission gear, and is supported by the second support unit and meshes with the fixed gear, and the first gear is By rotating together with the eccentric shaft, around the rotation shaft of the first gear And rotating while revolving, by the revolution and rotation is restrained, and a lock gear to which the rotation of the output portion is restricted.

According to the seventeenth aspect, when the rotational force is transmitted to the first gear, the first gear rotates together with the eccentric shaft. Accordingly, the transmission gear supported by the first support portion of the eccentric shaft revolves in a state where rotation is restricted by the rotation restricting member. When the transmission gear revolves, the output unit rotates. That is, the rotation transmitted to the first gear is reduced by the transmission gear and transmitted to the output unit. When the first gear rotates together with the eccentric shaft, the locking gear supported by the second support portion of the eccentric shaft revolves and rotates while meshing with the fixed gear. When the revolution and rotation of the lock gear are restricted, the rotation of the output unit is restricted. This limits the amount of rotation of the output unit. Here, in the speed reducer according to the seventeenth aspect, both the lock gear for restricting the rotation amount of the output portion and the rotation restricting member for restricting the rotation of the transmission gear mesh with or engage with the fixed gear. It is configured to match. Thus, in the speed reducer according to the seventeenth aspect, the size of the speed reducer can be reduced as compared with the case where the lock gear and the rotation restricting member mesh or engage with different fixed gears.

An eighteenth aspect of the present disclosure is a speed reducer, wherein a first gear that rotates by transmitting a torque is coupled to the first gear, and has a rotation diameter with respect to a rotation shaft of the first gear. An eccentric shaft having a first support portion and a second support portion that are offset in a direction, a fixed gear that is disposed radially outside of the eccentric shaft and whose rotation is restricted, and that is supported by the first support portion; A transmission gear that revolves around a rotation axis of the first gear when the first gear rotates together with the eccentric shaft; an output unit that rotates as the transmission gear revolves; and a second support unit And the first gear rotates together with the eccentric shaft to revolve around the rotation axis of the first gear and rotate, thereby restricting the rotation and rotation. By this, the rotation of the output section is restricted Comprising a Ya, a first restricting portion provided on said lock gear, that the first restricting portion abuts, and a second restricting portion revolution and rotation of the locking gear is restrained, the.

According to the speed reducer of the eighteenth aspect, when the torque is transmitted to the first gear, the first gear rotates together with the eccentric shaft. Thereby, the transmission gear supported by the first support portion of the eccentric shaft revolves. When the transmission gear revolves, the output unit rotates. When the first gear rotates together with the eccentric shaft, the locking gear supported by the second support portion of the eccentric shaft revolves and rotates while meshing with the fixed gear. Then, when the first regulating portion of the locking gear contacts the second regulating portion and the revolution and rotation of the locking gear are restrained, the rotation of the output portion is regulated. This limits the amount of rotation of the output unit. Here, in the speed reducer according to the eighteenth aspect, a lock gear for limiting the amount of rotation of the output unit is provided separately from a transmission gear for transmitting the rotational force to the output unit. Thus, the speed reducer according to the eighteenth aspect can reduce the rotation amount of the output portion from less than one rotation to one or more rotations without being restricted by the restriction of the relationship between the transmission gear and the output portion. Can be restricted.

According to the above aspect, the reduction gear and the motor with the reduction gear according to the present disclosure can be downsized.
Further, according to the above aspect, the speed reducer and the motor with the speed reducer according to the present invention can limit the rotation amount of the output unit (output shaft) from less than one rotation to one or more rotations.

FIG. 2 is an exploded perspective view showing the motor with a speed reducer according to the first exemplary embodiment in an exploded manner. FIG. 2 is an exploded perspective view showing the motor with a speed reducer according to the first exemplary embodiment in an exploded manner, and shows a view from the opposite side to FIG. It is sectional drawing which shows the cross section which cut | disconnected the motor with a reduction gear of a 1st exemplary embodiment along the rotation axis direction of the output gear body. FIG. 3 is a perspective view showing a lock gear, a fixed gear, and a transmission gear. FIG. 4 is a perspective view showing a fixed gear and a transmission gear engaged with the fixed gear. FIG. 6 is an exploded perspective view showing a motor with a reduction gear of the second exemplary embodiment in an exploded manner. FIG. 7 is an exploded perspective view showing a motor with a reduction gear of the second exemplary embodiment in an exploded manner, and shows a view seen from the opposite side to FIG.

(First exemplary embodiment)
A motor 10 with a speed reducer according to a first exemplary embodiment of the present disclosure will be described with reference to FIGS. 1 to 4. In addition, the arrow Z direction, the arrow R direction, and the arrow C direction appropriately shown in the drawing indicate one side in the rotation axis direction, the outside in the rotation radial direction, and one side in the rotation circumferential direction of the pinion gear 30C as the output gear, respectively. The opposite side to the arrow Z direction, the opposite side to the arrow R direction, and the opposite side to the arrow C direction are the other side in the rotation axis direction, the inner side in the rotation radial direction, and the other side in the rotation circumferential direction of the pinion gear 30C as the output gear. Are respectively shown. Further, when simply indicating the axial direction, the radial direction, and the circumferential direction, the rotational axis direction, the rotating radial direction, and the rotating circumferential direction of the pinion gear 30C are indicated unless otherwise specified.

As shown in FIGS. 1, 2, and 3, the motor with a speed reducer 10 of the present exemplary embodiment is a power seat motor for moving a seat cushion of a vehicle seat in a vertical direction of the seat. The motor 10 with a reduction gear includes a motor 12 which is a DC motor. In addition, the motor with reduction gear 10 includes a reduction gear 14 for reducing and transmitting the rotation of the rotation shaft 12A (see FIG. 3) of the motor 12 to the output gear body 30 as an output unit. Further, the motor with a speed reducer 10 includes a housing 16 in which the motor 12 is mounted and in which a speed reducer 14 is provided.

The speed reducer 14 includes a worm gear 18 fixed to the rotation shaft 12A of the motor 12, a helical gear 20 as a first gear meshing with the worm gear 18, and an eccentric shaft 22 provided integrally with the helical gear 20.

The speed reducer 14 includes a transmission gear 24 and a lock gear 26 supported by the eccentric shaft 22, and a fixed gear 28 that meshes with the transmission gear 24 and the lock gear 26. Further, the speed reducer 14 has a pinion gear 30 C that engages with the transmission gear 24 and has an axial direction that is the same as the axial direction of the transmission gear 24 and the lock gear 26 (the arrow Z direction and the arrow Z direction). Output gear body 30 directed in the opposite direction).

モータ The motor 10 with a reduction gear is provided with a spring 32 for suppressing backlash in the axial direction of the eccentric shaft 22 and the helical gear 20. The motor with reduction gear 10 includes a cover plate 34 in which the reduction gear 14 is accommodated in the housing 16 by being fixed to the housing 16.

ハウジング As shown in FIGS. 1 and 3, the housing 16 is formed using a resin material. The housing 16 is connected to a motor fixing portion 16A which is fixed in a state where the rotation shaft 12A of the motor 12 is oriented in a direction perpendicular to the axial direction (the direction of the arrow Z), and an external connector for supplying power to the motor 12. Connector section 16B (see FIG. 2). Further, the housing 16 includes a speed reducer housing recess 16C in which the speed reducer 14 is housed. The reduction gear housing concave portion 16C is formed in a concave shape with one axial side (arrow Z direction side) opened.

As shown in FIG. 3, the reduction gear housing recess 16C includes a bottom wall 16D that forms the bottom of the reduction gear housing recess 16C, an inner peripheral surface extending from the outer peripheral portion of the bottom wall 16D to one side in the axial direction. And a side wall 16 E formed in a substantially cylindrical shape. At the center of the bottom wall 16D of the reduction gear housing recess 16C, a cylindrical boss 16F into which the other axial end of the rotation center shaft 40 described later is inserted with a clearance is provided upright. I have. Further, a spring 32 is arranged around the boss 16F in the bottom wall 16D. A resin washer 36 is interposed between the bottom wall 16D and the spring 32.

As shown in FIG. 1, a part of a fixed gear 28, which will be described later, is fitted into the inner peripheral part of the side wall part 16 E of the reduction gear housing recess 16 C, thereby rotating the fixed gear 28 in the circumferential direction. Three fixed gear engaging portions 16G for restricting displacement are formed. The three fixed gear engaging portions 16G are configured by a square groove-shaped groove 16H extending in the axial direction and a columnar column 16I standing upright in the axial direction.

には Furthermore, three screw engaging portions 16J are provided on the outer peripheral portion of the housing 16 on the open end side of the reduction gear housing recess 16C. The cover plate 34 is fixed to the housing 16 by screwing the bolts 38 into the three screw engaging portions 16J.

The cover plate 34 is formed using a steel plate material or the like. The cover plate 34 has an exposure opening 34A for exposing the pinion gear 30C to the outside of the reduction gear housing recess 16C of the housing 16. Further, an annular rib 34B bent toward the other side in the axial direction is formed on a peripheral portion of the exposed opening 34A in the cover plate 34. Further, a bolt insertion hole 34 C through which the bolt 38 is inserted is formed in the cover plate 34. Further, a weld nut 34D to which a bolt for attaching the motor 10 with the speed reducer to an attached portion such as a seat cushion frame is screwed is connected to the cover plate 34.

螺 As shown in FIG. 3, a helical tooth portion is formed on the outer peripheral portion of the worm gear 18. The motor 12 in a state where the worm gear 18 is fixed to the rotation shaft 12A is fixed to the housing 16, so that the worm gear 18 is located on the bottom wall 16D side of the reduction gear housing recess 16C of the housing 16 and the inner periphery of the side wall 16E. It is arranged on the surface side.

ヘリ As shown in FIGS. 1, 2 and 3, the helical gear 20 is formed using a resin material. A plurality of external teeth that mesh with the teeth of the worm gear 18 are formed on the outer periphery of the helical gear 20. An eccentric shaft 22, which will be described later, is fixed to the shaft center of the helical gear 20 by insert molding. The helical gear 20 is rotatably supported by the housing 16 via the eccentric shaft 22 and the rotation center shaft 40.

As shown in FIGS. 1 and 3, the eccentric shaft 22 is formed of a metal material, and a part thereof is inserted into the helical gear 20 so that the eccentric shaft 22 can rotate integrally with the helical gear 20. Specifically, the eccentric shaft 22 includes a disk portion 22A formed in a disk shape extending in the radial direction with the axial direction as the thickness direction. The disk portion 22A is fixed to the inner peripheral portion of the helical gear 20 in a state where the axial center of the disk portion 22A coincides with the rotation center of the helical gear 20. Further, the eccentric shaft 22 includes a support portion 22B protruding from the center portion of the disk portion 22A toward one axial side. One axial side of the support portion 22B is a first support portion 22B1 on which a transmission gear 24 described later is rotatably supported. The other axial side of the support portion 22B is a second support portion 22B2 that is set to have a larger diameter than the first support portion 22B1 and that rotatably supports a locking gear 26 described later. The axial centers of the first support portion 22B1 and the second support portion 22B2 are offset in one direction radially outward with respect to the axial center of the disk portion 22A. The direction in which the first support portion 22B1 and the second support portion 22B2 are offset with respect to the axial center of the disk portion 22A is referred to as "offset direction D".

The eccentric shaft 22 is formed with a rotation center shaft insertion hole 22C that penetrates the disk portion 22A, the first support portion 22B1, and the second support portion 22B2 in the axial direction, and through which the rotation center shaft 40 is inserted. . The axis center of the rotation center axis insertion hole 22C (the axis center of the rotation center axis 40 inserted into the rotation center axis insertion hole 22C) coincides with the axis center of the disk portion 22A.

出力 As shown in FIGS. 2 and 3, the output gear body 30 is formed using a metal material. The output gear body 30 includes a transmission gear engaging portion 30B in which a plurality of recesses 30A that engage with the transmission gear 24 are formed. In the present exemplary embodiment, the transmission gear engaging portion 30B is formed with six concave portions 30A which are open on the other axial side and are arranged at equal intervals in the circumferential direction. The output gear body 30 is disposed coaxially with the transmission gear engaging portion 30B on one axial side with respect to the transmission gear engaging portion 30B, and has a plurality of external teeth formed on the outer peripheral portion. And a pinion gear 30C. An intermediate portion of the output gear body 30 between the transmission gear engaging portion 30B and the pinion gear 30C is a shaft-supported portion 30D that is supported by a rib 34B formed on the cover plate 34. Note that a bearing bush 42 formed of a resin material or the like is engaged with the inner peripheral surface of the rib 34B. This prevents or suppresses the metal-to-metal contact between the supported shaft portion 30D of the output gear body 30 and the rib 34B of the cover plate 34. A rod-shaped rotation center shaft 40 made of a metal material is fixed to the shaft center of the output gear body 30 by press-fitting or the like.

As shown in FIGS. 1 and 4, the fixed gear 28 is formed by pressing a metal material or the like. The fixed gear 28 includes a fixed gear main body 28A formed in an annular shape when viewed in the axial direction. In addition, the fixed gear 28 includes three engagement protrusions 28B protruding radially outward from the fixed gear main body 28A. The engaging projection 28B has a column insertion hole 28C through which the column 16I of the housing 16 is inserted. Then, in a state where the engagement projection 28B is engaged with the fixed gear engagement portion 16G of the housing 16 (the engagement projection 28B is disposed in the groove 16H and the column 16I is inserted into the column insertion hole 28C. When the push nut 44 is engaged with the pillar 16I, the fixed gear 28 is fixed to the housing 16.

複数 A plurality of internal teeth 28D with which a transmission gear 24 and a locking gear 26, which will be described later, mesh with each other are formed on the inner peripheral portion of the fixed gear main body 28A.

固定 As shown in FIG. 2, the fixed gear 28 includes a second regulating portion 28E protruding from the fixed gear main body 28A toward the other side in the axial direction. The second restricting portion 28E protrudes from a part of the fixed gear main body 28A in the circumferential direction to the other axial side.

伝達 As shown in FIGS. 2, 3 and 4, the transmission gear 24 is formed in a disk shape by subjecting a metal material to press working or the like. Outer teeth 24 A meshing with inner teeth 28 D of the fixed gear 28 are formed all around the outer periphery of the transmission gear 24. In the center of the transmission gear 24, a support hole 24B supported by the first support portion 22B1 of the eccentric shaft 22 via a bush 46 is formed. Further, the transmission gear 24 includes six protrusions 24C that protrude toward one side in the axial direction and are arranged at equal intervals in the circumferential direction. The outer diameter of the projection 24C is set to be smaller than the inner diameter of the recess 30A of the output gear body 30. Thereby, the convex portion 24C is engaged with the concave portion 30A of the output gear body 30 with a clearance.

The lock gear 26 is formed in a disk shape by subjecting a metal material to press working or the like, similarly to the transmission gear 24. Outer teeth 26B meshing with inner teeth 28D of the fixed gear 28 are formed all around the outer periphery of the lock gear 26. In the present exemplary embodiment, the number of external teeth 26A of the lock gear 26 is set to be greater than the number of external teeth 24A of the transmission gear 24. In the center of the lock gear 26, a support hole 26B supported by the second support portion 22B2 of the eccentric shaft 22 via a bush 48 is formed. Further, the lock gear 26 includes a first restricting portion 26C that protrudes radially outward and has a fan shape when viewed from the axial direction. The first restricting portion 26C is provided on a part of the lock gear 26 in the circumferential direction. When the outer teeth 26A of the lock gear 26 mesh with the inner teeth 28D of the fixed gear 28, the first restricting portion 26C extends along the other axial surface of the fixed gear body 28A of the fixed gear 28. Are located.

As shown in FIG. 3, the external teeth 24A of the transmission gear 24 are meshed with the internal teeth 28D of the fixed gear 28, and the external teeth 26A of the lock gear 26 are in mesh with the internal teeth 28D of the fixed gear 28. In the engaged state, the surface on the other axial side of the transmission gear 24 and the one surface in the axial direction of the lock gear 26 are in contact with each other. That is, the transmission gear 24 and the lock gear 26 are arranged so as to overlap in the axial direction.

(Operation of the present exemplary embodiment)
Next, the operation of the exemplary embodiment will be described.

As shown in FIG. 3, according to the motor with reduction gear 10 of the present exemplary embodiment, the rotation of the rotating shaft 12 A of the motor 12 is reduced by the reduction gear 14 and transmitted to the output gear body 30. That is, when the rotation shaft 12A of the motor 12 rotates, the worm gear 18 rotates. When the worm gear 18 rotates, the helical gear 20 meshing with the worm gear 18 rotates together with the eccentric shaft 22.

When the eccentric shaft 22 further rotates, the transmission gear 24 supported by the first support portion 22B1 of the eccentric shaft 22 revolves and rotates around the rotation center shaft 40 while meshing with the fixed gear 28. Further, when the transmission gear 24 revolves and rotates, of the rotational force resulting from the revolution and rotation, the rotational force associated with the rotation is transmitted from the convex portion 24C of the transmission gear 24 via the concave portion 30A of the output gear body 30 to the output gear. It is transmitted to the body 30. More specifically, the outer peripheral surface of the convex portion 24C of the transmission gear 24 slides on the inner peripheral surface of the concave portion 30A of the output gear body 30 and presses the inner peripheral surface, thereby causing the transmission gear 24 to revolve and rotate. Of the rotational force, the rotational force accompanying the rotation is transmitted to the output gear body 30. As a result, the output gear body 30 rotates, and the power seat of the vehicle can be operated via a gear that meshes with the pinion gear 30C of the output gear body 30. Here, since the transmission of the rotational force from the transmission gear 24 to the output gear body 30 is performed through the convex portion 24C and the concave portion 30A, the transmission force is transmitted from the transmission gear 24 to the output gear body 30. The configuration of the transmission gear 24 and the output gear body 30 can be simplified as compared with the case where the torque is transmitted by a gear. Note that the transmission gear 24 may have a concave portion 30A and the output gear body 30 may have a convex portion 24C.

When the eccentric shaft 22 rotates, the lock gear 26 supported by the second support portion 22B2 of the eccentric shaft 22 revolves and rotates around the rotation center shaft 40 while meshing with the fixed gear 28. Then, as shown in FIGS. 2 and 3, when the first restricting portion 26 C of the locking gear 26 abuts on the second restricting portion 28 E of the fixed gear 28, the revolution and rotation of the locking gear 26 are restricted. . Thereby, the rotation of the eccentric shaft 22 and the helical gear 20 is stopped, and the rotation of the output gear body 30 is stopped (the rotation is restricted). As a result, it is possible to prevent or suppress an excessive force from being input to the vehicle seat from the motor 10 with the speed reducer, and it is possible to prevent or suppress deterioration in sitting comfort due to deformation of members constituting the vehicle seat.

As described above, in the present exemplary embodiment, both the lock gear 26 for limiting the rotation amount of the output gear body 30 and the transmission gear 24 for transmitting the rotational force to the output gear body 30 are: It meshes with a single fixed gear 28. Thereby, the physique of the speed reducer 14 and the motor 10 with the speed reducer configured including the speed reducer 14 are different from the case where the lock gear 26 and the transmission gear 24 are configured to mesh with different fixed gears. Can be reduced in size. In the present exemplary embodiment, the transmission gear 24 and the locking gear 26 are arranged adjacent to and in contact with each other in the axial direction. Accordingly, the size of the reduction gear 14 and the motor 10 with the reduction gear including the reduction gear 14 can be further reduced in size.

In the present exemplary embodiment, the lock gear 26 for limiting the rotation amount of the output gear body 30 is provided separately from the transmission gear 24 for transmitting the rotational force to the output gear body 30. Thus, the rotation amount of the output gear body 30 can be limited to a predetermined rotation amount without or with little restriction on the relationship between the transmission gear 24 and the output gear body 30.

Here, in the present exemplary embodiment, the first restricting portion 26C of the lock gear 26 and the fixed gear 28 are rotated so that the rotation amount (rotation angle) of the output gear body 30 becomes a predetermined rotation amount of one rotation or more. The shape and size of the second regulating portion 28E and the number of external teeth 26A of the lock gear 26 are set. In particular, in the present exemplary embodiment, the number of external teeth 26A of the locking gear 26 is set to be greater than the number of external teeth 24A of the transmission gear 24. Thus, the rotation speed of the lock gear 26 when the helical gear 20 and the eccentric shaft 22 rotate can be lower than the rotation speed of the transmission gear 24. Thus, the first restriction of the lock gear 26 is smaller than the case where the number of the external teeth 26A of the lock gear 26 is set to be smaller than the number of the external teeth 24A of the transmission gear 24. The number of rotations of the output gear body 30 until the portion 26C comes into contact with the second regulating portion 28E can be increased. As a result, it is possible to easily limit the rotation amount of the output gear body 30 to one or more rotation amounts. When it is easy to limit the rotation amount of the output gear body 30 to a rotation amount of less than one rotation, the number of the external teeth 26A of the lock gear 26 is set to be smaller than the number of the external teeth 24A of the transmission gear 24. Should be set to a small number of teeth.

(Optimal configuration for ensuring the strength of the first restricting portion 26C and the second restricting portion 28E)
Next, an optimal configuration for ensuring the strength of the first restricting portion 26C and the second restricting portion 28E will be described.

By the way, the rotation of the rotating shaft 12A of the motor 12 is transmitted to the first regulating portion 26C and the second regulating portion 28E after being reduced by the helical gear 20, the locking gear 26 and the fixed gear 28. Therefore, when the first restricting portion 26C comes into contact with the second restricting portion 28E, a large force is applied to the contact portions of the two. Therefore, as shown in FIG. 5, it is preferable that the first restricting portion 26C and the second restricting portion 28E abut on the offset direction D side. More preferably, the first restricting portion 26C and the second restricting portion 28E may be brought into contact with each other on the extension (on the extension line L) of the eccentric shaft 22 (helical gear 20) in the offset direction D passing through the rotation center A. In this case, the position of the cutting edge of the external teeth 26A of the locking gear 26 or the position of the bottom of the external teeth 26A of the locking gear 26 (the center between the external teeth 26A adjacent to each other in the rotational circumferential direction) is extended as described above. What is necessary is just to set on the line L. With this configuration, the contact area between the first regulating portion 26C and the second regulating portion 28E can be easily secured, and the strength of the first regulating portion 26C and the second regulating portion 28E can be easily secured.

In the embodiment described above, an example was described in which the second restricting portion 28E was provided on the lock gear 26, but the present disclosure is not limited to this. For example, a portion corresponding to the second regulating portion 28E may be provided on the housing 16 or the like.

Further, in the embodiment described above, an example was described in which the external teeth 24A of the transmission gear 24 and the external teeth 26A of the locking gear 26 meshed with the internal teeth 28D of the fixed gear 28, but the present disclosure is not limited thereto. Not done. For example, the lock gear 26 may be provided with internal teeth with which the external teeth 24A of the transmission gear 24 mesh and with internal teeth with which the external teeth 26A of the lock gear 26 mesh.

(Second exemplary embodiment)
The motor 52 with a speed reducer according to the second exemplary embodiment of the present disclosure will be described with reference to FIGS. 6 and 7. In the motor with a speed reducer 52 according to the second exemplary embodiment, members and portions corresponding to those of the motor with a speed reducer 10 according to the first exemplary embodiment described above include the speed reducer according to the first exemplary embodiment. The same reference numerals are given to the members and portions corresponding to the motor 10 and the description thereof may be omitted.

As shown in FIGS. 6 and 7, in the motor with reduction gear 52 of the present exemplary embodiment, the external teeth 24 A of the transmission gear 24 mesh with the internal teeth 30 F formed on the output gear body 30. When the transmission gear 24 revolves in a state where the rotation (rotation) of the transmission gear 24 is restricted by the slider plate 52 as a rotation restricting member, the output gear body 30 rotates.

The transmission gear 24 includes a transmission gear body 24D having a plurality of external teeth 24A formed on an outer peripheral portion thereof. Further, the transmission gear 24 includes two restricting protrusions 24E protruding from the surface on the other axial side of the transmission gear main body 24D toward the other axial side. The two restricting protrusions 24E are arranged at equal intervals (at a pitch of 180 degrees) along the circumferential direction. The rotation (rotation) of the eccentric shaft 22 of the transmission gear 24 around the first support portion 22B1 is restricted by the engagement of the two restriction protrusions 24E with the slider plate 52 described later.

The transmission gear engaging portion 30B of the output gear body 30 has the transmission gear 24 side (the other side in the axial direction) open and the transmission gear main body 24D of the transmission gear 24 disposed therein. An accommodation recess 30E is formed. A plurality of internal teeth 30 F that mesh with the external teeth 24 A of the transmission gear 24 are formed on the radially outer inner peripheral portion of the housing recess 30 E.

As shown in FIG. 1, the slider plate 52 is formed using a metal plate material, and is formed in a rectangular shape when viewed in the axial direction. Note that an insertion hole 52A through which the first support portion 22B1 of the eccentric shaft 22 is inserted is formed in the shaft core portion of the slider plate 52. The slider plate 52 is disposed between two limiting protrusions 24E of the transmission gear 24 inside a slider plate engagement hole 28F formed in the fixed gear 28 described later. In addition, a surface that is disposed on the outer peripheral portion of the slider plate 52 so as to face each of the two limiting protrusions 24E in the radial direction is an engaged surface 52B. When the slider plate 52 is disposed between the two restricting protrusions 24E of the transmission gear 24, the slider plate 52 moves in the direction in which the engaged surface 52B and the restricting protrusion 24E face each other (one radial direction R1). The displacement of the transmission gear 24 with respect to the slider plate 52 is restricted, and the rotation (rotation) of the transmission gear 24 with respect to the slider plate 52 is restricted. In addition, by sliding the restricting projection 24E on the engaged surface 52B, the direction in which the engaged surface 52B and the restricting projection 24E slide (other than the radial direction orthogonal to the radial direction R1). The displacement of the transmission gear 24 with respect to the slider plate 52 in the direction R2) is allowed. In addition, a pair of surfaces arranged on the outer peripheral portion of the slider plate 52 so as to face and be close to an edge portion of a slider plate engaging hole 28F described later is a first slider surface 52C.

A portion of the fixed gear body 28A of the fixed gear 28, on which the internal teeth 28D are formed, has an axial center portion on one axial side where an edge is formed in a rectangular shape as viewed in the axial direction, and a slider is provided therein. A slider plate engaging hole 28F in which the plate 52 is arranged is formed. Further, at the edge of the slider plate engaging hole 28F, a surface disposed to be opposed to the pair of first slider surfaces 52C of the slider plate 52 in the radial direction is a second slider surface 28G. In addition, since the first slider surface 52C and the second slider surface 28G are arranged to face each other and to be close to each other, the rotation of the slider plate 52 with respect to the fixed gear 28 is restricted. In addition, since the first slider surface 52C slides on the second slider surface 28G, displacement of the slider plate 52 and the transmission gear 24 in one radial direction R1 is allowed. Thereby, when the eccentric shaft 22 rotates, the transmission gear 24 is rotated by the rotation center shaft 40 in a state where the rotation of the transmission gear 24 supported by the first support portion 22B1 of the eccentric shaft 22 is restricted. Revolves around the axis center.

According to the motor 52 with a speed reducer of the present exemplary embodiment described above, the worm gear 18 rotates when the rotation shaft of the motor (not shown) rotates. When the worm gear 18 rotates, the helical gear 20 meshing with the worm gear 18 rotates together with the eccentric shaft 22.

(4) When the eccentric shaft 22 further rotates, the transmission gear 24 supported by the first support portion 22B1 of the eccentric shaft 22 revolves around the rotation center axis 40. Further, when the transmission gear 24 revolves, the rotational force associated with the revolution is transmitted from the external teeth 24A of the transmission gear 24 to the output gear body 30 via the internal teeth 30F of the output gear body 30. As a result, the output gear body 30 rotates, and the power seat of the vehicle can be operated via a gear that meshes with the pinion gear 30C of the output gear body 30.

When the eccentric shaft 22 rotates, the lock gear 26 supported by the second support portion 22B2 of the eccentric shaft 22 revolves and rotates around the rotation center shaft 40 while meshing with the fixed gear 28. When the first restricting portion 26C of the locking gear 26 comes into contact with the second restricting portion 28E of the fixed gear 28, the revolution and rotation of the locking gear 26 are restricted. Thereby, the rotation of the eccentric shaft 22 and the helical gear 20 is stopped, and the rotation of the output gear body 30 is stopped (the rotation is restricted). As a result, it is possible to prevent or suppress an excessive force from being input from the motor with reduction gear 52 to the vehicle seat, and to prevent or suppress deterioration in sitting comfort due to deformation of a member constituting the vehicle seat.

As described above, in the present exemplary embodiment, the lock gear 26 for limiting the rotation amount of the output gear body 30 is provided separately from the transmission gear 24 for transmitting the rotational force to the output gear body 30. By being provided, the rotation amount of the output gear body 30 can be limited to a predetermined rotation amount while being free from or less likely to be restricted by the relationship between the transmission gear 24 and the output gear body 30.

Further, in the present exemplary embodiment, both the lock gear 26 for limiting the rotation amount of the output gear body 30 and the slider plate 52 for limiting the rotation of the transmission gear 24 are provided by a single fixed gear 28. Mesh with or engage with. Thereby, the physique of the speed reducer 14 and the motor with speed reducer 10 including the speed reducer 14 is reduced as compared with the case where the lock gear 26 and the slider plate 52 are meshed with different fixed gears. Can be downsized. Further, in the present exemplary embodiment, the transmission gear 24 and the slider plate 52 are arranged adjacent to and in contact with each other in the axial direction. Thus, the size of the reduction gear 14 and the motor 10 having the reduction gear including the reduction gear 14 can be further reduced.

The speed reducer 14 that constitutes a part of the motor 10 with a speed reducer of the first exemplary embodiment and the motor 50 with a speed reducer of the second exemplary embodiment described above is a speed reducer to which a so-called planetary gear mechanism is applied. Machine. Therefore, a gear whose rotation is limited may be appropriately selected in consideration of a reduction ratio required for the speed reducer 14 and the like. That is, any one of the planetary type, the solar type, and the star type may be appropriately selected in consideration of the reduction ratio required for the speed reducer 14 and the like. In addition, a KHV type planetary gear mechanism is applied to the speed reducer 14 that constitutes a part of the motor 50 with a speed reducer of the second exemplary embodiment. Therefore, a gear whose rotation is limited may be appropriately selected in consideration of a reduction ratio required for the speed reducer 14 and the like. That is, in consideration of the reduction ratio and the like required of the speed reducer 14, it is appropriately determined whether to adopt a configuration of a 2K-H type planetary gear mechanism, a 3K type planetary gear mechanism, a wave gear mechanism, a ball speed reducer, a crown speed reducer, or the like. Just choose.

As described above, an exemplary embodiment of the present disclosure has been described, but the present disclosure is not limited to the above, and can be variously modified and implemented in addition to the above without departing from the gist of the present disclosure. Of course there is.

Japanese Patent Application No. 2018-1333039 filed on Jul. 13, 2018, Japanese Patent Application No. 2018-13340 filed on Jul. 13, 2018, Japanese Patent Application filed on Feb. 25, 2019 The disclosure of Japanese Patent Application No. 2019-032134 and Japanese Patent Application No. 2018-032135 filed on Feb. 25, 2019 is incorporated herein by reference in its entirety.

All documents, patent applications, and technical standards described herein are to the same extent as if each individual document, patent application, and technical standard were specifically and individually stated to be incorporated by reference. Incorporated herein by reference.

Claims

A first gear that rotates by transmitting the torque,
An eccentric shaft coupled to the first gear and having a first support portion and a second support portion offset in the radial direction of rotation with respect to the rotation shaft of the first gear;
A fixed gear that is arranged radially outside the eccentric shaft and whose rotation is restricted,
A transmission gear that is supported by the first support portion, meshes with the fixed gear, and rotates around the rotation axis of the first gear by rotating the first gear with the eccentric shaft; ,
An output unit that rotates by the transmission gear revolving and rotating,
The first gear is supported by the second support portion and meshes with the fixed gear. When the first gear rotates together with the eccentric shaft, the first gear revolves around the rotation axis of the first gear and revolves. A lock gear in which rotation of the output unit is restricted by rotation being restricted,
Speed reducer with.
2. The reduction gear according to claim 1, wherein the transmission gear and the lock gear are arranged adjacent to and in contact with each other in a rotation axis direction of the first gear.
The fixed gear is provided with a contacted part with which a part of the lock gear contacts.
3. The reduction gear according to claim 1, wherein revolving and rotation of the locking gear are regulated by a part of the locking gear abutting on the abutted portion. 4.
One of the transmission gear and the output portion is provided with a convex portion that protrudes in a rotation axis direction of the output portion,
The other of the transmission gear and the output portion is provided with a concave portion in which the convex portion is engaged with a clearance,
When the transmission gear revolves and rotates in a state where the projection and the recess are engaged, the output unit rotates.
The speed reducer according to any one of claims 1 to 3.
A first regulating portion provided on the locking gear;
A second restricting portion in which the first restricting portion abuts to restrict the revolution and rotation of the lock gear;
The speed reducer according to claim 1, further comprising:
The reduction gear according to claim 5, wherein the number of teeth of the lock gear is set to be greater than the number of teeth of the transmission gear.
The reduction gear according to claim 5, wherein the number of teeth of the lock gear is set to be smaller than the number of teeth of the transmission gear.
The fixed gear is provided with the second restricting portion,
The first restricting portion and the second restricting portion abut on a side where the second support portion is offset with respect to a rotation axis of the first gear;
The speed reducer according to any one of claims 5 to 7.
A motor having a rotating shaft;
A first gear that rotates by transmitting the rotation force of the rotation shaft,
An eccentric shaft coupled to the first gear and having a first support portion and a second support portion offset in the radial direction of rotation with respect to the rotation shaft of the first gear;
A fixed gear that is arranged radially outside the eccentric shaft and whose rotation is restricted,
A transmission gear that is supported by the first support portion, meshes with the fixed gear, and rotates around the rotation axis of the first gear by rotating the first gear with the eccentric shaft; ,
An output unit that rotates by the transmission gear revolving and rotating,
The first gear is supported by the second support portion and meshes with the fixed gear. When the first gear rotates together with the eccentric shaft, the first gear revolves around the rotation axis of the first gear and revolves. A lock gear in which rotation of the output unit is restricted by rotation being restricted,
Motor with speed reducer.
The motor with a reduction gear according to claim 9, wherein the transmission gear and the lock gear are arranged adjacent to and in contact with each other in the rotation axis direction of the first gear.
The fixed gear is provided with a contacted part with which a part of the lock gear contacts.
Revolution and rotation of the lock gear are regulated by a part of the lock gear abutting on the contacted portion,
A motor with a speed reducer according to claim 9.
One of the transmission gear and the output portion is provided with a convex portion that protrudes in a rotation axis direction of the output portion,
The other of the transmission gear and the output portion is provided with a concave portion in which the convex portion is engaged with a clearance,
When the transmission gear revolves and rotates in a state where the projection and the recess are engaged, the output unit rotates.
A motor with a speed reducer according to any one of claims 9 to 11.
A first regulating portion provided on the locking gear;
A second restricting portion in which the first restricting portion abuts to restrict the revolution and rotation of the lock gear;
The motor with a speed reducer according to claim 9, further comprising:
The motor with a reduction gear according to claim 13, wherein the number of teeth of the lock gear is set to be greater than the number of teeth of the transmission gear.
The motor with a reduction gear according to claim 13, wherein the number of teeth of the lock gear is set to be smaller than the number of teeth of the transmission gear.
The fixed gear is provided with the second restricting portion,
The first restricting portion and the second restricting portion abut on a side where the second support portion is offset with respect to a rotation axis of the first gear;
The motor with a reduction gear according to any one of claims 13 to 15.
A first gear that rotates by transmitting the torque,
An eccentric shaft coupled to the first gear and having a first support portion and a second support portion offset in the radial direction of rotation with respect to the rotation shaft of the first gear;
A fixed gear that is arranged radially outside the eccentric shaft and whose rotation is restricted,
A rotation restricting member engaged with a part of the fixed gear,
The rotation is restricted by being supported by the first support portion and being engaged with the rotation restricting member, and the first gear rotates around the rotation axis of the first gear by rotating together with the eccentric shaft. A transmission gear;
An output unit that rotates as the transmission gear revolves,
The first gear is supported by the second support portion and meshes with the fixed gear. When the first gear rotates together with the eccentric shaft, the first gear revolves around the rotation axis of the first gear and revolves. A lock gear in which rotation of the output unit is restricted by rotation being restricted,
Speed reducer with.
18. The speed reducer according to claim 17, wherein the transmission gear and the lock gear are arranged adjacent to and in contact with each other in the rotation axis direction of the first gear.
The fixed gear is provided with a contacted part with which a part of the lock gear contacts.
The reduction gear according to claim 17 or 18, wherein a part of the locking gear abuts on the abutted portion, whereby the revolution and rotation of the locking gear are regulated.
A first regulating portion provided on the locking gear;
A second restricting portion in which the first restricting portion abuts to restrict the revolution and rotation of the lock gear;
The speed reducer according to claim 17, further comprising:
The reduction gear according to claim 20, wherein the number of teeth of the lock gear is set to be greater than the number of teeth of the transmission gear.
21. The reduction gear according to claim 20, wherein the number of teeth of the lock gear is set to be smaller than the number of teeth of the transmission gear.
The fixed gear is provided with the second restricting portion,
The first restricting portion and the second restricting portion abut on a side where the second support portion is offset with respect to a rotation axis of the first gear;
The speed reducer according to any one of claims 20 to 22.
A first gear that rotates by transmitting the torque,
An eccentric shaft coupled to the first gear and having a first support portion and a second support portion offset in the radial direction of rotation with respect to the rotation shaft of the first gear;
A fixed gear that is arranged radially outside the eccentric shaft and whose rotation is restricted,
A transmission gear supported by the first support portion, the transmission gear revolving around a rotation axis of the first gear when the first gear rotates together with the eccentric shaft;
An output unit that rotates as the transmission gear revolves,
The first gear is supported by the second support portion and meshes with the fixed gear. When the first gear rotates together with the eccentric shaft, the first gear revolves around the rotation axis of the first gear and revolves. A lock gear in which rotation of the output unit is restricted by rotation being restricted,
A first regulating portion provided on the locking gear;
A second restricting portion in which the first restricting portion abuts to restrict the revolution and rotation of the lock gear;
Speed reducer with.
25. The reduction gear according to claim 24, wherein the transmission gear and the lock gear are arranged adjacent to and in contact with each other in the rotation axis direction of the first gear.
The fixed gear is provided with a contacted part with which a part of the lock gear contacts.
The speed reducer according to claim 24 or claim 25, wherein a part of the locking gear abuts on the abutted portion, thereby revolving and rotating the locking gear.
The reduction gear according to claim 24, wherein the number of teeth of the lock gear is set to be greater than the number of teeth of the transmission gear.
The reduction gear according to claim 24, wherein the number of teeth of the lock gear is set to be smaller than the number of teeth of the transmission gear.
The fixed gear is provided with the second restricting portion,
The first restricting portion and the second restricting portion abut on a side where the second support portion is offset with respect to a rotation axis of the first gear;
The speed reducer according to any one of claims 24 to 28.