JP2011256988A - Transmission drive unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission drive unit which can be made compact.SOLUTION: The tip of a shift select shaft 15 is housed in a housing 22. The housing 22 has a first side wall 111 formed by penetrating of an insertion hole 110 in a thickness direction. A first slide bearing 101 is fixed to the inner circumference of the insertion hole 110 to support the shift select shaft 15 rotatably around a central axial line 17 and movably in an axial direction M4. In the outer surface of the first side wall 111, an annular groove 115 surrounding the outer circumference of the first slide bearing 101. An insertion port 108 is closed by a cap member 105 having an annular part 107 entering the annular groove 115. The cap member 105 is fixed to the shift select shaft 5. A part between the annular part 107 and the inner circumference of the insertion hole 110 is sealed by a sealing member 103 overlapping the first slide bearing 101 in the axial direction.

Description

  The present invention relates to a transmission drive device for driving a transmission.

The transmission drive device is used, for example, for automating a shift operation of a parallel gear transmission for an automobile.
The transmission drive device has a shift select shaft for shifting operation of the transmission. The shift select shaft is driven by an electric actuator included in the transmission drive device. As a result, the shift select shaft shifts by rotating around its central axis, and performs a select operation by axial movement. Patent Document 1 shows an example of this transmission drive device.

  In Patent Document 1, a rack portion that engages with a pinion for moving the shift select shaft in the axial direction is formed on the outer periphery of one end portion of the shift select shaft. Further, a spline portion is formed on the outer periphery of a position (for example, the other end portion in Patent Document 1) that is different from the rack portion in the shift select shaft in the axial direction. A mechanical element (for example, a gear) for rotating the shift select shaft is spline-fitted to the spline portion.

JP-A-63-30737

  When a mechanism for shifting the shift select shaft and a mechanism for selecting the shift select shaft are integrated, and when these mechanisms are housed in a housing to form an electric actuator, the shift select shaft is mounted in the housing. It is necessary to support it so that it can rotate around its central axis and can move in the axial direction. For example, a slide bearing that slides on the outer periphery of the shift select shaft and supports the shift select shaft is used to support the shift select shaft. Further, in such a case, it is necessary to seal between the housing and the outer periphery of the shift select shaft using a seal member with respect to the insertion hole through which the shift select shaft is inserted so that dust and dust do not enter the housing. is there. Therefore, it is necessary to attach a slide bearing or a seal member to the entire circumference of the portion accommodated in the housing of the shift select shaft.

  However, when a spline portion or a rack portion is formed on the shift select shaft, it is necessary to attach a slide bearing or a seal member to a position excluding the spline portion or the rack portion on the outer periphery of the shift select shaft. And it is also necessary to arrange | position a plain bearing and a sealing member so that it may rank in an axial direction. Therefore, it is necessary to set the axial length of the portion of the shift select shaft accommodated in the housing to be long. As a result, the housing becomes longer in the axial direction, and the electric actuator may be increased in size.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a transmission drive device that can reduce the axial length of the portion of the shift select shaft that is to be accommodated in the housing, thereby reducing the size of the device. It is.

  According to the first aspect of the present invention, there is provided a partition wall (111) in which a shift select shaft (15) for transmission transmission and a cylindrical insertion hole (110) through which the shift select shaft is inserted are formed in the thickness direction. A housing (22) that contains a portion including the tip (15A) of the shift select shaft, and is fixed to the inner periphery of the insertion hole in the partition wall, and is in sliding contact with the outer periphery of the shift select shaft, A slide bearing (101) that supports the shift select shaft so as to be rotatable about its central axis (17) and movable in the axial direction (M4), and in the partition, the tip of the shift select shaft with respect to the partition An annular groove (115) that surrounds the outer periphery of the slide bearing is formed on the outer surface that is the surface opposite to the part side, and an annular groove that enters the annular groove and surrounds the outer periphery of the slide bearing. A cap member (105) that is fixed to the shift select shaft and covers an insertion opening (108) formed by opening the insertion hole on the outer surface; and an outer periphery of the annular portion. And an annular seal member (103) for sealing between the outer periphery of the annular groove in the partition wall, wherein the sliding bearing and the seal member overlap in the axial direction. ).

The numbers in parentheses indicate corresponding components in the embodiments described later. The same applies hereinafter.
According to this configuration, the plain bearing is fixed to the inner periphery of the insertion hole in the partition wall, and is in sliding contact with the outer periphery of the shift select shaft to support the shift select shaft. Further, the partition insertion port is covered with a cap member fixed to the shift select shaft, and the gap between the cap member and the partition wall is sealed by a seal member that overlaps the slide bearing in the axial direction.

Since the slide bearing and seal member overlap in the axial direction, the shaft length of the portion of the shift select shaft that should be accommodated in the housing is shortened compared to when the slide bearing and seal member are arranged in the axial direction. can do. Therefore, the apparatus can be reduced in size.
The invention according to claim 2 has a shift select shaft (15) for transmission gearshift having at least a tip portion (15A) hollow, and a projection (205) inserted into the tip portion of the shift select shaft, and the shift A housing (22) for accommodating a portion including the tip of the shift select shaft of the select shaft, fixed to the outer periphery of the protrusion, and slidably contacted with the inner periphery of the shift select shaft, the shift select shaft being the central axis thereof (17) a slide bearing (202) that is supported to be rotatable around and axially movable (M4), and a driving force is applied to the outer periphery of the tip portion of the shift select shaft with respect to the shift select shaft. A gearbox (36) for meshing is provided with a rack portion (122), and the slide bearing and the rack portion are overlapped in the axial direction. A.

According to this configuration, the tip portion of the shift select shaft is hollow, and the rack portion is formed on the outer periphery thereof. The tip of the shift select shaft is supported by a protrusion that passes through the inside thereof. Further, the slide bearing is fixed to the outer periphery of the protrusion, and supports the shift select shaft in sliding contact with the inner periphery of the shift select shaft.
Since the slide bearing and rack part overlap in the axial direction, the part that should be accommodated in the housing of the shift select shaft compared to the case where the slide bearing is mounted at a position excluding the rack part on the outer periphery of the shift select shaft Can be shortened. Therefore, the apparatus can be reduced in size.

  The invention according to claim 3 is provided with a shift select shaft (15) for transmission gearshift having at least a front end portion (15A) and a protrusion (205) inserted into the front end portion of the shift select shaft, A housing (111) including a partition wall (111) formed with a cylindrical insertion hole (110) through which the shift select shaft is inserted, and penetrating in the thickness direction; 22), fixed to the inner periphery of the insertion hole in the partition wall, slidably contacted with the outer periphery of the shift select shaft, and the shift select shaft can be rotated about its central axis (17) and axially (M4) A first slide bearing (101) that is movably supported, fixed to the outer periphery of the projection, slidably contacted with the inner periphery of the shift select shaft, and the shift select shaft is rotated about its central axis And a second slide bearing (202) that is movably supported in the axial direction, and the outer surface of the partition opposite to the tip side of the shift select shaft with respect to the partition, An annular groove (115) surrounding the outer periphery of the first slide bearing is formed, and has an annular portion (107) that enters the annular groove and surrounds the outer periphery of the first slide bearing, and the shift select shaft has A cap member (105) that is fixed and covers the insertion opening (108) formed by opening the insertion hole on the outer surface, and between the outer periphery of the annular portion and the outer periphery of the annular groove in the partition wall And an annular seal member (103) that seals the outer periphery of the end of the shift select shaft with a gear for engaging a gear (36) that applies a driving force to the shift select shaft. A transmission drive device in which a portion (112) is formed, the first slide bearing and the seal member overlap in the axial direction, and the second slide bearing and the rack portion overlap in the axial direction. (200).

According to this configuration, the first slide bearing is fixed to the inner periphery of the insertion hole in the partition wall, and is in sliding contact with the outer periphery of the shift select shaft to support the shift select shaft. Further, the partition insertion port is covered with a cap member fixed to the shift select shaft, and the gap between the cap member and the partition wall is sealed with a seal member that overlaps the first slide bearing in the axial direction.
Since the first slide bearing and the seal member are overlapped in the axial direction, the portion of the shift select shaft to be accommodated in the housing is smaller than when the first slide bearing and the seal member are arranged along the axial direction. The shaft length can be shortened.

The tip of the shift select shaft is hollow, and a rack portion is formed on the outer periphery thereof. The tip of the shift select shaft is supported by a protrusion that passes through the inside thereof. The second plain bearing is fixed to the outer periphery of the protrusion, and supports the shift select shaft in sliding contact with the inner periphery of the shift select shaft.
Since the second slide bearing and the rack portion overlap in the axial direction, the second slide bearing is accommodated in the housing of the shift select shaft as compared with the case where the second slide bearing is mounted at a position excluding the rack portion on the outer periphery of the shift select shaft. The axial length of the portion to be made can be further shortened. Therefore, the apparatus can be reduced in size.

  The invention according to claim 4 includes a shift select shaft (15) for shifting the transmission and a partition wall (411) in which a cylindrical insertion hole (410) through which the shift select shaft is inserted is formed, and the shift A housing (22) that accommodates a portion including the tip portion (15A) of the select shaft, and is fixed to an inner periphery of the insertion hole in the partition wall, surrounds an outer periphery of the shift select shaft, and is in sliding contact with the outer periphery; A cylindrical slide bearing (401) that supports the shift select shaft so as to be rotatable about its central axis (17) and movable in the axial direction (M4), and a fitting provided on the partition wall so as to protrude and retract in the radial direction. And a fitting groove (406) for fitting with the tip of the fitting member is formed on the outer peripheral surface of the shift select shaft. Formed on the plain bearing Has been passed hole through (407; 421 422), adapted to fit into the fitting groove, a transmission drive (400).

According to this configuration, the fitting groove is formed in the outer periphery of the shift select shaft and the fitting member is fitted, so that the axial movement of the shift select shaft is prevented.
When the shift select shaft extends in the vertical direction due to the mounting posture of the transmission on the vehicle or the like, a downward force (downward force) due to the weight of the shift select shaft acts on the shift select shaft. When the shift select shaft is connected to a drive source or the like, the shift select shaft is restricted from moving in the axial direction, but the shift select shaft is shifted by switching the clutch mechanism included in the drive mechanism for driving the shift select shaft. When the select shaft is not connected to a drive source or the like, the shift select shaft is lowered, and accordingly, a reverse driving force may be input to the drive mechanism. However, according to this configuration, even if the shift select shaft is disconnected from the drive source or the like by switching the clutch mechanism, the shift select shaft is prevented from moving down because the shift select shaft is prevented from moving in the axial direction. Can be prevented.

  In the configuration of claim 4, since the fitting member and the fitting groove are fitted through the passage hole formed in the sliding bearing, the pair of the fitting member and the fitting groove and the sliding bearing overlap in the axial direction. is doing. Therefore, the axial length of the portion of the shift select shaft that should be accommodated in the housing can be shortened as compared with the case where the plain bearing and the pair of the fitting member and the fitting groove are arranged in the axial direction. . Therefore, the apparatus can be reduced in size.

1 is an exploded perspective view of a schematic configuration of a transmission to which a transmission drive device according to a first embodiment of the present invention is applied. It is sectional drawing which shows the structure of the electric actuator shown in FIG. It is sectional drawing when cut | disconnecting by the cut surface line III-III of FIG. It is sectional drawing which shows the principal part structure of the transmission with which the transmission drive device of 2nd Embodiment of this invention was applied. It is sectional drawing which shows the principal part structure of the transmission with which the transmission drive device of 3rd Embodiment of this invention was applied. It is sectional drawing which shows the principal part structure of the transmission with which the transmission drive device of 4th Embodiment of this invention was applied. It is an expanded sectional view for explaining the composition of a lock ball, a fitting slot, and the 1st slide bearing. It is a perspective view which shows an example of the 1st slide bearing shown in FIG. It is a perspective view which shows the other example of a 1st slide bearing. It is a perspective view which shows the other example of a 1st slide bearing.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is an exploded perspective view of a schematic configuration of a transmission 1 to which a transmission drive device 3 according to a first embodiment of the present invention is applied.
The transmission 1 includes a transmission 2 and a transmission drive device 3 that drives the transmission 2 to change speed.

The transmission 2 is a known constant mesh parallel gear transmission (not shown), and is mounted on a vehicle such as a passenger car or a truck.
The transmission 2 includes a gear housing 7, a parallel gear type transmission mechanism (not shown) housed in the gear housing 7, a shift select shaft 15 that causes the transmission mechanism to perform a shift select operation, and a shift select shaft 15 And an electric actuator 21 used as a common drive source for performing a shift operation or a select operation.

  One end 16a of an internal lever 16 accommodated in the gear housing 7 is supported on the middle portion of the shift select shaft 15 so as to be able to rotate together and move in the axial direction M4 of the shift select shaft 15. More specifically, it is fixed to one end 16 a of the internal lever 16. The internal lever 16 rotates together with the shift select shaft 15 around the central axis 17 of the shift select shaft 15. One end portion of the shift select shaft 15 (upper right side end portion shown in FIG. 1) protrudes outside the gear housing 7.

  In the gear housing 7, a plurality of shift rods 10A, 10B, 10C extending in parallel with each other are accommodated. Shift blocks 12A, 12B, and 12C that engage with the other end 16b of the internal lever 16 are fixed to the shift rods 10A, 10B, and 10C. Each shift rod 10A, 10B, 10C is provided with a shift fork 11 that engages with a clutch sleeve (not shown) (in FIG. 1, only the shift fork 11 provided on the shift rod 10A is shown). ).

  When the shift select shaft 15 is rotated around the central axis 17 by the electric actuator 21, the internal lever 16 swings around the central axis 17 of the shift select shaft 15. As a result, the shift blocks 12A, 12B, and 12C engaged with the internal lever 16 move in the axial directions M1, M2, and M3 of the shift rods 10A, 10B, and 10C, thereby achieving a shift operation. .

On the other hand, when the shift select shaft 15 is moved in the axial direction M4 by the electric actuator 21, the internal lever 16 is moved in the axial direction M4 of the shift select shaft 15. As a result, the other end 16b of the internal lever 16 is engaged with the required shift blocks 12A, 12B, and 12C, thereby achieving the select operation.
The electric actuator 21 includes a substantially cylindrical housing 22 with a bottom. The electric actuator 21 is fixed to the outer surface of the gear housing 7 or a predetermined portion of the vehicle. The housing 22 accommodates a portion including the tip 15A (see FIG. 3) of the shift select shaft 15.

FIG. 2 is a cross-sectional view showing the configuration of the electric actuator 21 shown in FIG. 3 is a cross-sectional view taken along the cutting plane line III-III in FIG.
The electric actuator 21 includes the electric motor 23, a shift conversion mechanism 24 for converting the rotational torque of the electric motor 23 into a force for rotating the shift select shaft 15 around the central axis 17, and the rotational torque of the electric motor 23. A select conversion mechanism 25 for converting the shift select shaft 15 into a force that moves the shift select shaft 15 in the axial direction M4 (a direction orthogonal to the paper surface shown in FIG. 2; the left-right direction shown in FIG. 3), and the rotational driving force of the electric motor 23 A switching unit 26 is provided for switching the transmission destination between the shift conversion mechanism 24 and the select conversion mechanism 25. The electric motor 23, the shift conversion mechanism 24, the select conversion mechanism 25, and the switching unit 26 are accommodated in the housing 22.

A shift select shaft 15 is supported on the housing 22 so as to be rotatable around its central axis 17 and to be movable in the axial direction M4 (a direction perpendicular to the paper surface shown in FIG. 2, the left-right direction shown in FIG. 3).
The opening (left side shown in FIG. 2) of the housing 22 is closed by a substantially plate-like lid 27. The housing 22 and the lid 27 are formed using a material such as cast iron or aluminum, for example, and the outer periphery of the lid 27 is fitted into the opening of the housing 22. The lid 27 is formed with a circular through hole 29 penetrating the inner surface (right surface shown in FIG. 2) and the outer surface (left surface shown in FIG. 2).

For example, a brushless motor is employed as the electric motor 23. The electric motor 23 is attached so as to be exposed outside the housing 22. The output shaft 40 of the electric motor 23 extends along a predetermined direction (left-right direction shown in FIG. 2) orthogonal to the shift select shaft 15.
The switching unit 26 includes a first transmission shaft 41 that is coaxially connected to the output shaft 40 of the electric motor 23, a first rotor 42 that is coaxial with the first transmission shaft 41 and that can be rotated together with the first transmission shaft 41, and a first rotor 42. A second rotor 44 provided coaxially with the transmission shaft 41 so as to be able to rotate together, and a clutch mechanism 39 for switching the connection destination of the first transmission shaft 41 between the first rotor 42 and the second rotor 44; It has. The second rotor 44 is disposed on the electric motor 23 side with respect to the first transmission shaft 41.

  The first transmission shaft 41 is provided with a small-diameter main shaft portion 46 provided on the electric motor 23 side, and a large-diameter portion 47 provided on the first rotor 42 side following the main shaft portion 46 and having a larger diameter than the main shaft portion 46. And. A second rotor 44 surrounding the outer periphery of the main shaft portion 46 of the first transmission shaft 41 is provided on the side opposite to the first rotor 42 with respect to the large-diameter portion 47 of the first transmission shaft 41. That is, the first and second rotors 42 and 44 are arranged so as to sandwich the large diameter portion 47 of the first transmission shaft 41.

  The clutch mechanism 39 includes a first electromagnetic clutch 43 that connects / releases the first transmission shaft 41 and the first rotor 42, and a second electromagnetic clutch 45 that connects / releases the first transmission shaft 41 and the second rotor 44. It has. The clutch mechanism 39 can selectively switch between a state where the first transmission shaft 41 is connected to the first rotor 42 and a state where the first transmission shaft 41 is connected to the second rotor 44. ing.

  In the operating state of the first electromagnetic clutch 43 (the excitation state of the electromagnetic coil included in the first electromagnetic clutch 43), the second electromagnetic clutch 45 is in the non-operating state (the non-excitation state of the electromagnetic coil included in the second electromagnetic clutch 45). It is in. In the operating state of the second electromagnetic clutch 45 (the excitation state of the electromagnetic coil included in the second electromagnetic clutch 45), the first electromagnetic clutch 43 is in the non-operating state (the non-excitation state of the electromagnetic coil included in the first electromagnetic clutch 43). It is in. Therefore, the clutch mechanism 39 selectively switches between the state where the first transmission shaft 41 is connected to the first rotor 42 and the state where the first transmission shaft 41 is connected to the second rotor 44. In the coupled state of the first transmission shaft 41 and the first rotor 42, the first transmission shaft 41 and the second rotor 44 are released, and in the coupled state of the first transmission shaft 41 and the second rotor 44, The one transmission shaft 41 and the first rotor 42 are released.

  On the outer periphery of the second rotor 44, an annular first gear 56 having a relatively small diameter is fitted and fixed. The first gear 56 is provided coaxially with the second rotor 44. The first gear 56 is supported by a rolling bearing 57. An outer ring of the rolling bearing 57 is fitted and fixed to the first gear 56. The inner ring of the rolling bearing 57 is externally fixed to the outer periphery of the main shaft portion 46 of the first transmission shaft 41.

  The shift conversion mechanism 24 includes a ball screw mechanism 58 and a connecting rod 60 that connects the nut 59 of the ball screw mechanism 58 and the shift select shaft 15. The ball screw mechanism 58 is connected to the first rotor 42, and includes a screw shaft 61 coaxial with the first rotor 42 (or coaxial with the first transmission shaft 41), and a nut 59 attached to the screw shaft 61. Yes. A plurality of balls (not shown) are movably interposed between the male screw of the screw shaft 61 and the female screw of the nut 59, and the ball screw mechanism 58 causes the rotation of the first rotor 42 to rotate. This is converted into linear movement in the direction along the screw shaft 61.

  One end of the screw shaft 61 (left end shown in FIG. 2) is supported by a rolling bearing 64. An inner ring of the rolling bearing 64 is fitted and fixed to one end of the screw shaft 61. Further, the outer ring of the rolling bearing 64 is fitted in a through-hole penetrating the inner and outer surfaces of the bottom wall 65 of the unit casing fixed to the housing 22. Further, a lock nut 66 is engaged with the outer ring of the rolling bearing 64, and movement in the other axial direction (rightward in FIG. 2) is restricted. A portion of the one end portion of the screw shaft 61 that is closer to the electric motor 23 than the rolling bearing 64 (on the left side in FIG. 2) is inserted into the inner periphery of the first rotor 42 and is coupled to the first rotor 42 so as to be able to rotate together. Has been.

  The other end portion (right end portion shown in FIG. 2) of the screw shaft 61 is supported by a rolling bearing 67. The outer ring of the rolling bearing 67 is fixed to the housing 22. On both side surfaces of the nut 59, a pair of cylindrical engaging shafts 70 (only one is shown in FIG. 2) extending in a direction along the shift select shaft 15 (a direction perpendicular to the paper surface in FIG. 2; the left-right direction in FIG. 3) ) Projectingly formed.

  The connecting rod 60 includes a first connecting portion 72 for connecting to the nut 59, a second connecting portion 73 (see FIG. 3) for connecting to the shift select shaft 15, and the first connecting portion 72 and the second connecting portion. And a connecting rod 74 for connecting to 73. The first connecting portion 72 includes a pair of support plate portions 76 having U-shaped engaging grooves 78 that engage with the engaging shafts 70. The second connecting portion 73 has a cylindrical shape and is externally fitted to the shift select shaft 15. A spline groove 75 (see FIG. 3) is formed on the inner periphery of the second connecting portion 73 to be spline-fitted to the spline portion 121 on the outer periphery of the shift select shaft 15.

  The select conversion mechanism 25 includes a first gear 56, a second transmission shaft 95 that extends in parallel with the first transmission shaft 41 and is rotatably provided, and one end of the second transmission shaft 95 (the left end shown in FIG. 2). ) A second gear 81 that is coaxially fixed at a predetermined position near the second end, and a small-diameter pinion 36 that is coaxially fixed at a predetermined position near the other end (the right end shown in FIG. 2) of the second transmission shaft 95. I have. The second gear 81 is formed with a larger diameter than both the first gear 56 and the pinion 36.

  One end of the second transmission shaft 95 (left end shown in FIG. 2) is supported by a rolling bearing 96 fixed to the housing 22. The inner ring of the rolling bearing 96 is externally fitted and fixed to one end portion (left end portion shown in FIG. 2) of the second transmission shaft 95. The outer ring of the rolling bearing 96 is fixed in a cylindrical recess 97 formed on the inner surface of the lid 27 that covers the opening of the housing 22. Further, the other end portion (the right end portion shown in FIG. 2) of the second transmission shaft 95 is supported by a rolling bearing 84.

  The rotation amount of the second transmission shaft 95 is measured by the first rotation amount sensor 87. A sensor hole 85 penetrating the inner and outer surfaces is formed in the bottom wall of the housing 22 (the inner wall opposite to the lid 27; the inner wall on the right side shown in FIG. 2). The first rotation amount sensor 87 includes a sensor unit (not shown) and a first sensor shaft 99 connected to the sensor unit. The distal end portion of the first sensor shaft 99 is connected to the second end portion 82 of the second transmission shaft 95 through the sensor hole 85 so as to be able to rotate together. The first sensor shaft 99 is rotated with the rotation of the second transmission shaft 95, and the rotation amount of the second transmission shaft 95 is measured by measuring the rotation amount of the first sensor shaft 99. A measurement value obtained by the first rotation amount sensor 87 is input to an ECU 88 described later.

  A second rotation amount sensor 89 (not shown in FIG. 3; see FIG. 2) for measuring the rotation amount of the shift select shaft 15 is provided in the housing 22. The second rotation amount sensor 89 includes a main body 90 in which a sensor unit (not shown) is incorporated, a second sensor shaft 94 connected to the sensor unit, and a sector gear 91 that is externally fixed to the second sensor shaft 94. It has. The sector gear 91 meshes with a sensor gear 92 (not shown in FIG. 3; see FIG. 2) provided so as to be able to rotate together with the shift select shaft 15 (fixed on the outside). As the shift select shaft 15 rotates, the sensor gear 92, the sector gear 91, and the second sensor shaft 94 are rotated. By measuring the rotation amount of the second sensor shaft 94, the rotation amount of the shift select shaft 15 is reduced. Detected. The detection value of the second rotation amount sensor 89 is input to the ECU 88 described below.

  When the shift knob 93 of the vehicle is operated, a signal from an operation detection sensor of the shift knob 93 is given to an ECU 88 (Electronic Control Unit). The ECU 88 drives and controls the electric motor 23 via a motor driver (not shown). The ECU 88 controls driving of the first and second electromagnetic clutches 43 and 45 through a relay circuit (not shown).

  The housing 22 includes a bottomed box-shaped housing main body 22 </ b> A that accommodates the electric motor 23, the shift conversion mechanism 24, the select conversion mechanism 25, the switching unit 26, and a portion excluding the tip of the shift select shaft 15. The housing body 22A includes a first side wall (partition wall) 111 having an insertion hole 110 through which the shift select shaft 15 is inserted, and a second side wall 112 having an inner surface facing the inner surface of the first side wall 111. The insertion hole 110 is a cylindrical insertion hole and is formed so as to penetrate the first side wall 111 in the thickness direction. The thickness B1 of the first side wall 111 is set small. The housing 22 bulges from the second side wall 112 to the side opposite to the insertion hole 110 side (that is, outward) with respect to the second side wall 112, and bulges 113 (FIG. 3) accommodate the tip of the shift select shaft 15. Reference) is further provided. The bulging amount from the second side wall 112 of the bulging portion 113 is set to A1. On the inner surface of the bulging portion 113, a cylindrical accommodation recess 114 that accommodates the distal end portion of the shift select shaft 15 is formed.

  The shift select shaft 15 is supported by first and second slide bearings 101 and 102 (see FIG. 3) so as to be rotatable around the central axis 17 and movable in the axial direction M4. Further, the gap between the housing 22 and the outer periphery of the shift select shaft 15 is sealed by a seal member 103 provided in association with the insertion hole 110 so that dust and dust do not enter the housing 22.

  The first plain bearing 101 has a cylindrical shape and is fixed to the inner periphery of the insertion hole 110. The first plain bearing 101 surrounds the outer periphery of the shift select shaft 15 over the entire circumference in the circumferential direction, and is in sliding contact with the outer periphery of the shift select shaft 15. The first plain bearing 101 is disposed between the outer surface of the first side wall 111 (the left side surface shown in FIG. 3) and the inner surface of the first side wall 111 (the right side surface shown in FIG. 3).

  The second plain bearing 102 has a cylindrical shape and is fixed to the inner periphery of the housing recess 114. The second slide bearing 102 surrounds the entire outer periphery of the shift select shaft 15. The second plain bearing 102 is in sliding contact with the outer periphery of the tip portion of the shift select shaft 15 and supports the portion. The first slide bearing 101 is in sliding contact with the base end side slightly from the tip end portion of the shift select shaft 15 and supports the portion.

  The outer surface of the first side wall 111 (the surface of the first side wall 111 opposite to the tip side of the shift select shaft 15 with respect to the first side wall 111) is slightly radially outward from the inner periphery of the insertion hole 110. An annular groove 115 surrounding the outer periphery of the first plain bearing 101 is formed at the position. A first cylindrical surface 116 is formed on the inner periphery of the annular groove 115 with the center axis 17 of the shift select shaft 15 as the center. A second cylindrical surface 117 is formed on the outer periphery of the annular groove 115 with the center axis 17 of the shift select shaft 15 as the center.

On the outer surface of the first side wall 111, an insertion hole 110 is opened to form an insertion port 108. The insertion port 108 is covered and closed by a cap member 105 fixed to the shift select shaft 15.
The cap member 105 has a cylindrical cup shape as a whole. The cap member 105 includes an annular plate-like portion 106 fixed to the outer periphery of the shift select shaft 15 and a cylindrical annular portion extending from the outer periphery of the annular plate-like portion 106 in a direction orthogonal to the annular plate-like portion 106. 107. The annular portion 107 enters the annular groove 115 and surrounds the outer periphery of the first slide bearing 101. When the cap member 105 is attached to the first side wall 111, a gap is formed between the inner periphery of the annular portion 107 and the outer periphery of the annular groove 115. The annular plate-like portion 106 is fixed to the outer periphery of the shift select shaft 15 by, for example, screw fitting.

The seal member 103 is an annular member that seals between the outer periphery of the annular portion 107 and the outer periphery of the annular groove 115. The seal member 103 is provided over the entire circumference of the annular groove 115, and is fitted and fixed to the second cylindrical surface 117. The seal member 103 is disposed at a position overlapping with the first slide bearing 101 in the axial direction.
Between the portion where the first slide bearing 101 slides and the portion where the second slide bearing 102 slides on the outer periphery of the shift select shaft 15, a spline portion 121 made of a male spline and a rack portion 122 with which the pinion 36 meshes. The first slide bearing 101 is formed in this order from the side.

The spline groove 75 of the second connecting portion 73 and the spline portion 121 of the shift select shaft 15 are spline-fitted. In other words, the second connecting portion 73 is connected to the outer periphery of the shift select shaft 15 in a state where relative rotation is not possible and relative axial movement is allowed with respect to the shift select shaft 15.
That is, when the first electromagnetic clutch 43 is in the operating state and the second electromagnetic clutch 45 is in the non-operating state, the first electromagnetic clutch 43 is in the connected state and the second electromagnetic clutch 45 is in the released state. At this time, the rotational torque of the electric motor 23 is applied to the screw shaft 61 via the first rotor 42. Then, the ball screw mechanism 58 converts the rotational movement of the screw shaft 61 into a linear movement of the nut 59, and the nut 59 moves along the screw shaft 61. As the nut 59 moves linearly, the connecting rod 60 swings around the center axis 17 of the shift select shaft 15, and as the connecting rod 60 swings, the shift select shaft 15 moves around the center axis 17. Rotate. Thereby, a shift operation is performed.

  Further, when the first electromagnetic clutch 43 is in a non-operating state and the second electromagnetic clutch 45 is in an operating state, the first electromagnetic clutch 43 is in a connected state and the second electromagnetic clutch 45 is in a released state. At this time, the rotational torque of the electric motor 23 is applied to the first gear 56 via the second rotor 44. The rotational torque applied to the first gear 56 is applied to the pinion 36 via the second gear 81 and the second transmission shaft 95. Since the pinion 36 is engaged with the rack portion, the shift select shaft 15 moves in the axial direction M4 as the pinion 36 rotates. As a result, a select operation is performed.

  As described above, according to this embodiment, the first plain bearing 101 is fixed to the inner periphery of the insertion hole 110 in the first side wall 111 and is in sliding contact with the outer periphery of the shift select shaft 15 to support the shift select shaft 15. . The insertion opening 108 of the first side wall 111 is covered with a cap member 105 fixed to the shift select shaft 15, and the gap between the cap member 105 and the first side wall 111 overlaps the first slide bearing 101 in the axial direction. The sealing member 103 is sealed.

  Since the first slide bearing 101 and the seal member 103 overlap in the axial direction, the thickness B1 of the first side wall 111 is set smaller than in the case where the first slide bearing 101 and the seal member 103 are arranged along the axial direction. Thereby, the axial length of the portion of the shift select shaft 15 to be accommodated in the housing 22 can be shortened. Therefore, the electric actuator 21 can be reduced in size.

FIG. 4 is a cross-sectional view showing a main configuration of a transmission to which the transmission driving device 200 according to the second embodiment of the present invention is applied. In the second embodiment, parts corresponding to those shown in the embodiment (first embodiment) shown in FIGS. 1 to 3 are denoted by the same reference numerals as those in the first embodiment, and will be described. Is omitted. Moreover, FIG. 1 and FIG. 2 are referred together as needed.
The main difference between the transmission drive device 200 of the second embodiment and the transmission drive device 3 of the first embodiment is that the tip portion 15A of the shift select shaft 15 is formed hollow.

The housing body 22 </ b> A includes a first side wall (partition wall) 111 and a second side wall 212 having an inner surface facing the inner surface of the first side wall 111.
The housing 22 further includes a bulging portion 213 that bulges from the second side wall 212 to the side opposite to the insertion hole 110 side (that is, outward) with respect to the second side wall 212 and accommodates the distal end portion 15A of the shift select shaft 15. I have. On the inner surface of the bulging portion 213, a cylindrical accommodation recess 214 that accommodates the distal end portion of the shift select shaft 15 is formed. The bulging amount A2 from the second side wall 212 of the bulging portion 213 is smaller than the bulging amount A1 from the second side wall 112 of the bulging portion 113 in the transmission drive device 3 of the first embodiment ( A2 <A1). A cylindrical rotating shaft (protrusion) 205 extending in a direction orthogonal to the second side wall 212 is formed in the housing recess 214 so as to protrude from the second side wall 212.

  The tip 15A of the shift select shaft 15 is formed in a hollow cylindrical shape. A columnar rotating shaft 205 is inserted into the distal end portion 15 </ b> A of the shift select shaft 15. A second plain bearing 202 is fitted and fixed to the peripheral surface of the rotating shaft 205. The second plain bearing 102 has a cylindrical shape, and supports the shift select shaft 15 so as to be rotatable around its central axis 17 and movable in the axial direction M4. The second slide bearing 102 is surrounded by the tip 15A of the shift select shaft 15 on the entire circumference. The second plain bearing 102 is in sliding contact with the inner periphery of the tip portion 15A of the shift select shaft 15 and supports the portion. A rack portion 122 that engages with the pinion 36 is formed on the outer periphery of the distal end portion 15A of the shift select shaft 15.

  As described above, according to this embodiment, the first plain bearing 101 is fixed to the inner periphery of the insertion hole 110 in the first side wall 111 and is in sliding contact with the outer periphery of the shift select shaft 15 to support the shift select shaft 15. . The insertion opening 108 of the first side wall 111 is covered with a cap member 105 fixed to the shift select shaft 15, and the gap between the cap member 105 and the first side wall 111 overlaps the first slide bearing 101 in the axial direction. The sealing member 103 is sealed.

Since the first slide bearing 101 and the seal member 103 overlap in the axial direction, the thickness B1 of the first side wall 111 is set smaller than in the case where the first slide bearing 101 and the seal member 103 are arranged along the axial direction. Thereby, the axial length of the portion of the shift select shaft 15 to be accommodated in the housing 22 can be shortened.
Further, the distal end portion 15A of the shift select shaft 15 is hollow, and a rack portion 122 is formed on the outer periphery thereof. The distal end portion 15A of the shift select shaft 15 is supported by a rotating shaft 205 that passes through the inside thereof. The second plain bearing 202 is fixed to the outer periphery of the rotary shaft 205 and supports the shift select shaft 15 in sliding contact with the inner periphery of the shift select shaft 15.

  Since the second sliding bearing 202 and the rack portion 122 overlap in the axial direction, the bulging amount A2 of the bulging portion 213 can be set small. Thereby, compared with the case where the 2nd slide bearing 202 is attached to the position except the rack part 122 in the outer periphery of the shift select axis | shaft 15, the axial length of the part which should be accommodated in the housing 22 in the shift select axis | shaft 15 is more. It can be further shortened. Therefore, the electric actuator 21 can be reduced in size.

FIG. 5 is a cross-sectional view showing a main configuration of a transmission to which the transmission drive apparatus 300 according to the third embodiment of the present invention is applied. In the third embodiment, parts corresponding to those shown in the embodiment (second embodiment) shown in FIG. 4 are denoted by the same reference numerals as those in the second embodiment, and description thereof is omitted. . Moreover, FIG. 1 and FIG. 2 are referred together as needed.
The main difference between the transmission driving device 300 of the third embodiment and the transmission driving device 200 of the second embodiment is that the cap member 105 is not provided on the shift select shaft 15 and the annular groove 115 is not provided on the housing 22. This is the configuration.

  The housing main body 22A includes a first side wall (partition wall) 211 having an insertion hole 210 through which the shift select shaft 15 is inserted, and a second side wall 212 having an inner surface facing the inner surface of the first side wall 211. The thickness B2 of the first side wall 211 is set to be larger than the thickness B1 of the first side wall 111 in the transmission driving device 3 of the first embodiment (B2> B1). The insertion hole 210 is a cylindrical insertion hole and is formed so as to penetrate in the thickness direction of the first side wall 211.

  The shift select shaft 15 is supported by a first slide bearing 201 and a second slide bearing 202 so as to be rotatable around the central axis 17 and movable in the axial direction M4. Further, a space between the housing 22 and the outer periphery of the shift select shaft 15 is sealed by a seal member 203 provided in association with the insertion hole 210 so that dust and dust do not enter the housing 22.

  The first plain bearing 201 has a cylindrical shape and is fixed to the inner periphery of the insertion hole 210. The first plain bearing 201 surrounds the outer periphery of the shift select shaft 15 over the entire circumference, and is in sliding contact with the outer periphery of the shift select shaft 15. The seal member 203 is fixed to the inner periphery of the insertion hole 210 and seals between the inner periphery of the insertion hole 210 and the outer periphery of the shift select shaft 15. The seal member 203 is provided over the entire circumference of the shift select shaft 15 in the circumferential direction. The first slide bearing 201 and the seal member 203 are arranged in this order from the outer surface side of the first side wall 211.

  As described above, according to this embodiment, the distal end portion 15A of the shift select shaft 15 is hollow, and the rack portion 122 is formed on the outer periphery thereof. The distal end portion 15A of the shift select shaft 15 is supported by a rotating shaft 205 that passes through the inside thereof. The second plain bearing 202 is fixed to the outer periphery of the rotary shaft 205 and supports the shift select shaft 15 in sliding contact with the inner periphery of the shift select shaft 15.

  Since the second sliding bearing 202 and the rack portion 122 overlap in the axial direction, the bulging amount A2 of the bulging portion 213 can be set small. As a result, the shaft length of the portion of the shift select shaft 15 to be accommodated in the housing 22 is shortened as compared with the case where the second slide bearing 202 is attached to a position excluding the rack portion 122 on the outer periphery of the shift select shaft 15. can do. Therefore, the electric actuator 21 can be reduced in size.

FIG. 6 is a cross-sectional view showing a main configuration of a transmission to which the transmission drive device 400 according to the fourth embodiment of the present invention is applied. In the fourth embodiment, portions corresponding to those shown in the embodiment (first embodiment) shown in FIGS. 1 to 3 are denoted by the same reference numerals as those in the first embodiment, and are described. Is omitted. Moreover, FIG. 1 and FIG. 2 are referred together as needed.
The main point of difference between the transmission drive device 400 of the fourth embodiment and the transmission drive device 3 of the first embodiment is that it fits into a fitting groove 406 formed on the outer peripheral surface of the shift select shaft 15 on the housing 22 side. The point is that a lock ball (fitting member) 405 is provided for engaging (engaging) and preventing the shift select shaft 15 from moving in the axial direction M4.

  The housing body 22A includes a first side wall (partition wall) 411 having an insertion hole 410 through which the shift select shaft 15 is inserted, and a second side wall 112 having an inner surface facing the inner surface of the first side wall 411. The thickness B3 of the first side wall 411 is set to be larger than the thickness B1 of the first side wall 111 in the transmission driving device 3 of the first embodiment (B3> B1). The insertion hole 410 is a cylindrical insertion hole and is formed so as to penetrate in the thickness direction of the first side wall 411. A recess 412 is formed on the outer surface of the first side wall 411.

  The shift select shaft 15 is supported by the first slide bearing 401 and the second slide bearing 102 so as to be rotatable about the central axis 17 and movable in the axial direction M4. Further, a space between the housing 22 and the outer periphery of the shift select shaft 15 is sealed by a seal member 403 provided in association with the insertion hole 410 so that dust and dust do not enter the housing 22.

  The first plain bearing 401 has a cylindrical shape and is fixed to the inner periphery of the insertion hole 410. The first plain bearing 401 surrounds the outer periphery of the shift select shaft 15 over the entire circumference in the circumferential direction, and is in sliding contact with the outer periphery of the shift select shaft 15. The seal member 403 is fixed to the inner periphery of the insertion hole 410 and seals between the inner periphery of the insertion hole 410 and the outer periphery of the shift select shaft 15. The seal member 403 is provided over the entire circumference in the circumferential direction of the shift select shaft 15. The first slide bearing 401 and the seal member 403 are arranged in this order from the outer surface side of the first side wall 411.

  In the fourth embodiment, the shift select shaft 15 extends along the vertical direction (vertical direction or a direction close to the vertical direction) with the transmission 1 mounted on a vehicle. At this time, a downward force (downward force) due to its own weight acts on the shift select shaft 15, and a rotational force based on the own weight of the shift select shaft 11 acts on the transmission shaft 95. As described above, the clutch mechanism 39 selectively switches between the state where the first transmission shaft 41 is connected to the first rotor 42 and the state where the first transmission shaft 41 is connected to the second rotor 44. is there. Further, as described above, in the connected state of the first transmission shaft 41 and the first rotor 42, the first transmission shaft 41 and the second rotor 44 are released, and the first transmission shaft 41 and the second rotor 44 are released. In the connected state, the first transmission shaft 41 and the first rotor 42 are released.

  Therefore, when the first transmission shaft 41 is connected to the second rotor 44 by the clutch mechanism 39, the first transmission shaft 41 is connected to the first transmission shaft via the second rotor 44, the first gear 56, and the second gear 81. 41 (the output shaft 40 of the electric motor 23). In this case, since the movement of the shift select shaft 15 in the axial direction is restricted by the first transmission shaft 41, the shift select shaft 15 is not lowered (moved in the axial direction M4) due to its own weight. However, in this embodiment, the clutch mechanism 39 is not provided with a brake mechanism or the like. Therefore, in a state where the first transmission shaft 41 is connected to the first rotor 42 by the clutch mechanism 39, that is, in a state where the first transmission shaft 41 and the second rotor 44 are released, the first transmission shaft 41 (the electric motor 23). Since the output shaft 40) and the shift select shaft 15 are not connected, the shift select shaft 15 may be lowered. Therefore, there is a possibility that the position in the axial direction (select position) of the shift select shaft 15 may change (possibility of reverse input) without being controlled by the ECU 88, which is not preferable.

FIG. 7 is an enlarged cross-sectional view for explaining the configuration of the lock ball 405, the fitting groove 406, and the first slide bearing 401. FIG. 8 is a perspective view showing an example of the first plain bearing 401. Next, the configuration of the lock ball 405, the fitting groove 406, and the first slide bearing 401 will be described with reference to FIGS.
In the first side wall 411, a cylindrical through hole 408 that penetrates the side surface of the recess 412 and the outer periphery of the insertion hole 410 is formed so as to extend in a direction orthogonal to the shift select shaft 15. A lock ball 405 is accommodated in the through hole 408. The lock ball 405 has a substantially cylindrical shape. The tip of the rock ball 405 has a hemispherical shape. A driving member (not shown) is coupled to the lock ball 405.

A plurality of (for example, three) fitting grooves 406 are formed in a portion of the outer periphery of the shift select shaft 15 that is in sliding contact with the first slide bearing 401. Each fitting groove 406 extends in the circumferential direction, and its circumferential length is set over the entire circumference. The plurality of fitting grooves 406 are arranged at equal intervals.
The first sliding bearing 401 is formed with a round hole 407 as a passing hole that penetrates the inner and outer surfaces of the first sliding bearing 401. The round hole 407 is formed corresponding to (matching) the opening of the through hole 408 in the inner periphery of the insertion hole 410. When the lock ball 405 is fitted to the outer periphery of the shift select shaft 15, the lock ball 405 passes through the round hole 407 and its tip protrudes inward from the inner peripheral surface of the first slide bearing 401. It fits into the groove 406. Due to the fitting between the lock ball 405 and the fitting groove 406, the shift select shaft 15 is prevented from moving in the axial direction M4.

As described above, according to this embodiment, due to the fitting between the lock ball 405 and the fitting groove 406, the shift select shaft 15 is prevented from moving in the axial direction M4. Therefore, even when the shift select shaft 15 and the first transmission shaft 41 are disconnected due to the switching of the clutch mechanism 39, the shift select shaft 15 can be prevented from lowering.
Further, since the lock ball 405 and the fitting groove 406 are fitted through the round hole 407 formed in the first slide bearing 101, the pair of the lock ball 405 and the fitting groove 406 and the first slide bearing 401 are connected to the shaft. Duplicate in direction. Therefore, the axial length of the portion of the shift select shaft 15 that should be accommodated in the housing 22 as compared with the case where the first slide bearing 401 and the pair of the lock ball 405 and the fitting groove 406 are arranged along the axial direction. Can be shortened. Therefore, the electric actuator 21 can be reduced in size.

As mentioned above, although four embodiment of this invention was described, this invention can also be implemented with another form.
For example, in the fourth embodiment, other types of passage holes may be employed as the passage holes formed in the first slide bearing 401. As the passage hole, for example, an axial hole 421 extending in the axial direction of the shift select shaft 15 as shown in FIG. 9 may be employed. Further, for example, as shown in FIG. 10, a notch 422 formed along the axial direction of the shift select shaft 15 from one end face of the first slide bearing 401 (the end face on the right front side shown in FIG. 10) is a passage hole. It may be adopted as.

Further, an urging member for elastically pressing the lock ball 405 toward the outer periphery of the shift select shaft 15 may be provided.
Further, the first slide bearing 401 and the lock ball 405 may be unitized.
In the second and third embodiments, the shift select shaft 15 may be formed by a hollow shaft that is hollow from one end to the other end.

  In addition, various design changes can be made within the scope of matters described in the claims.

  DESCRIPTION OF SYMBOLS 3 ... Transmission drive device, 15 ... Shift select axis | shaft, 15A ... Tip part, 17 ... Center axis, 22 ... Housing, 101 ... 1st slide bearing, 103 ... Seal member, 105 ... Cap member, 107 ... Annular part, 108 DESCRIPTION OF SYMBOLS ... Insertion port, 110 ... Insertion hole, 111 ... 1st side wall (partition wall), 115 ... Annular groove, 200 ... Transmission drive, 202 ... 2nd slide bearing, 205 ... Rotating shaft (protrusion), 300 ... Transmission drive 400, transmission drive device, 401 ... first slide bearing, 405 ... lock ball (fitting member), 406 ... fitting groove, 407 ... round hole (passing hole), 410 ... insertion hole, 411 ... first 1 side wall (partition wall), 421 ... axial hole (passing hole), 422 ... notch (passing hole), M4 ... axial direction

Claims (4)

A shift select shaft for shifting the transmission,
A housing that has a partition wall formed by penetrating in the thickness direction a cylindrical insertion hole through which the shift select shaft is inserted, and that houses a portion including the tip of the shift select shaft;
A sliding bearing fixed to the inner periphery of the insertion hole in the partition wall, slidably contacting the outer periphery of the shift select shaft, and supporting the shift select shaft so as to be rotatable about its central axis and axially movable. ,
An annular groove surrounding the outer periphery of the slide bearing is formed on the outer surface of the partition wall, which is the surface opposite to the tip side of the shift select shaft with respect to the partition wall.
A cap member that has an annular portion that enters the annular groove and surrounds the outer periphery of the slide bearing, is fixed to the shift select shaft, and covers an insertion opening formed by opening the insertion hole on the outer surface. When,
An annular seal member that seals between the outer periphery of the annular portion and the outer periphery of the annular groove in the partition;
The transmission drive device, wherein the slide bearing and the seal member overlap in an axial direction. A shift select shaft for shifting the transmission having at least a hollow tip, and
A housing having a protrusion inserted into a tip portion of the shift select shaft, and housing a portion including the tip portion of the shift select shaft;
A slide bearing that is fixed to the outer periphery of the protrusion, is in sliding contact with the inner periphery of the shift select shaft, and supports the shift select shaft so as to be rotatable about its central axis and movable in the axial direction;
On the outer periphery of the tip portion of the shift select shaft, a rack portion is formed for meshing with a gear that applies driving force to the shift select shaft.
The transmission drive device, wherein the sliding bearing and the rack portion overlap in the axial direction. A shift select shaft for shifting the transmission having at least a hollow tip, and
A projection that is inserted into the tip of the shift select shaft, and a partition wall that is formed with a cylindrical insertion hole through which the shift select shaft is inserted in the thickness direction. A housing for accommodating a portion including the tip, and
A first plain bearing fixed to the inner periphery of the insertion hole in the partition wall, slidably contacting the outer periphery of the shift select shaft, and supporting the shift select shaft so as to be rotatable about its central axis and axially movable; ,
A second slide bearing fixed to the outer periphery of the protrusion, slidably in contact with the inner periphery of the shift select shaft, and supporting the shift select shaft so as to be rotatable about its central axis and axially movable;
An annular groove surrounding the outer periphery of the first slide bearing is formed on the outer surface of the partition wall, which is a surface opposite to the tip end side of the shift select shaft with respect to the partition wall.
It has an annular portion that enters the annular groove and surrounds the outer periphery of the first slide bearing, is fixed to the shift select shaft, and covers an insertion opening formed by opening the insertion hole on the outer surface. A cap member;
An annular seal member that seals between the outer periphery of the annular portion and the outer periphery of the annular groove in the partition;
On the outer periphery of the tip portion of the shift select shaft, a rack portion is formed for meshing with a gear that applies driving force to the shift select shaft.
The transmission driving apparatus, wherein the first sliding bearing and the seal member overlap in the axial direction, and the second sliding bearing and the rack portion overlap in the axial direction. A shift select shaft for shifting the transmission,
A housing having a partition wall formed with a cylindrical insertion hole through which the shift select shaft is inserted, and housing a portion including a tip portion of the shift select shaft;
It is fixed to the inner periphery of the insertion hole in the partition wall, surrounds the outer periphery of the shift select shaft and is in sliding contact with the outer periphery, and supports the shift select shaft so as to be rotatable about its central axis and axially movable. A cylindrical plain bearing;
Including a fitting member provided in the partition wall so as to be able to appear and disappear in the radial direction,
On the outer peripheral surface of the shift select shaft, a fitting groove for fitting with the tip of the fitting member is formed,
The transmission drive device, wherein the fitting member is adapted to be fitted into the fitting groove through a passage hole formed in the sliding bearing.

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