JP2015131532A - Automatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic transmission which suppresses an increase in weight and length of a shift operation part by reducing the number of components of the shift operation part, has improved in mountability to a vehicle, and has a low cost.SOLUTION: An automatic transmission 1 includes: a transmission case 2; a gear train 3 arranged on an inner space 29 of the transmission case 2, to which any of a plurality of shift gear sets can be selectively engaged and connected; a shift and select shaft 4 which performs selection operation and engagement connection operation of the shift gear sets by movement in the shaft direction and turning around shaft; and an actuator 5 which drives the shift and select shaft 4. Therein, the shift and select shaft 4 is borne by a bearing part 82 disposed on the internal space 29 of the transmission case 2, and is arranged on the internal space 29 together with the gear train 3. The actuator 5 is disposed on the outside of the transmission case 2 and drives the shift and select shaft 4 via a driving mechanism 6 which penetrates the transmission case 2.

Description

  The present invention relates to an automatic transmission suitable for mounting on a vehicle, and more particularly to a gear synchronous mesh type automatic transmission including a plurality of transmission gear sets and a synchronization device.

  As one type of vehicle transmission, there is a gear synchronous meshing transmission that selectively meshes and connects any of a plurality of transmission gear sets having different gear ratios. In this type of transmission, at first, an operation force is transmitted to the inside of the transmission by a manual operation in which a driver operates a shift lever, and a gear shifting operation is performed. In recent years, in order to reduce the burden on the driver while taking advantage of the gear synchronous mesh type and good power transmission efficiency, an automatic transmission that is equipped with an actuator and automatically performs a shift operation has become widespread. The automatic transmission evolved from such a manual operation system is a shift-and-select shaft that selects and drives one of the synchromesh mechanisms (synchronizers) provided for each of the two transmission gear sets and a plurality of synchromesh mechanisms. And an actuator for moving the shift and select shaft in the axial direction and rotating around the shaft. The applicant of the present application discloses a technical example relating to a shift operation portion of this type of gear synchronous mesh type automatic transmission in Patent Document 1.

  The transmission operating device disclosed in Patent Document 1 includes a shift-and-select shaft, an inner lever that is formed integrally with the shift-and-select shaft and selects and shifts the fork shaft, an interlock plate, an actuator plate, The interlock plate has a lock member, and the actuator plate has a plurality of claw members that clamp the lock member when assembled. Thereby, when assembling the operating device, the assembly work of the assembly parts including the interlock plate is improved, and a reliable assembly structure can be obtained.

JP 2008-128465 A

  By the way, since the technical example of Patent Document 1 is an automatic transmission that has evolved from a manual transmission, many parts including a transmission gear set can be used in common, and there is an effect that a design change is not required. Was. On the other hand, in order to add an actuator or the like, it is necessary to provide an actuator case separately from the transmission main body case. For this reason, automating the speed change operation has had the adverse effect of significantly increasing the number of parts of the speed change operation unit and the weight of the transmission. Furthermore, the outer dimensions of the transmission are increased, and in addition, the rear end of the shift-and-select shaft has a distorted shape that protrudes greatly.

  In addition, it is necessary to assemble the actuator case alone and assemble it to the transmission main body case in the sub-assembly state. For this reason, the work man-hours increased significantly, and a production line for subassembly was required, and the work contents were not easy. For example, in a shift and select shaft arranged from the actuator case to the main body case, the rear end is in a sub-assembly state supported by the actuator case, and the front end is inserted into the transmission main body case and engaged with a member in the main body. It was a difficult task to make. In addition, there is a concern that the assembling accuracy may be lowered due to a shift or inclination of a shaft center of a support portion that supports the shift and select shaft on the actuator case side and the main body case side.

  In addition, the material cost increases due to a significant increase in the number of parts of the speed change operation unit, and the assembly cost also increases due to the significant increase in the number of work steps. As a result, the cost of the automatic transmission becomes expensive.

  The present invention has been made in view of the above-described problems of the background art, and reduces the number of parts of the speed change operation portion, suppresses the increase in the length and length, and improves the mountability to the vehicle. Providing is a problem to be solved.

  An automatic transmission according to the present invention includes a transmission case, a gear train that is disposed in an inner space of the transmission case and that can selectively engage with one of a plurality of transmission gear sets, an axial movement, and a shaft An automatic transmission comprising: a shift-and-select shaft that performs a selection operation and a meshing connection operation of the plurality of transmission gear sets by turning around; and an actuator that drives the shift-and-select shaft, The shaft is supported by a support portion provided in an internal space of the transmission case, and is disposed in the internal space together with the gear train. The actuator is provided outside the transmission case, and the transmission case is The shift and select shaft is driven through a penetrating drive mechanism.

  Furthermore, the gear train has an input shaft and an output shaft arranged in parallel with each other, and the shift and select shaft is arranged substantially in parallel with a plane defined by the axis of the input shaft and the axis of the output shaft. Is preferred.

  Furthermore, it is preferable that the gear train has an input shaft and an output shaft arranged in parallel with each other, and the actuator and the drive mechanism are disposed along the axial length direction of the input shaft and the output shaft. .

  Further, the transmission case includes a thick body portion having a large cross-sectional area of the internal space and a thin body portion having a small cross-sectional area of the internal space, and the shift and select shaft is provided inside the thick body portion. The actuator is preferably provided outside the narrow body.

  In the automatic transmission according to the present invention, the shift and select shaft is disposed in the inner space of the transmission case together with the gear train, and the actuator is provided outside the transmission case. For this reason, unlike the conventional technology, the shift and select shaft and its surrounding parts are directly assembled in the inner space of the transmission case, and then the actuator is directly assembled to the outside of the transmission case to constitute the shift operation unit. it can. Therefore, an actuator case that has been conventionally required is not necessary. Thereby, the number of parts of a speed change operation part can be reduced, an increase in the length can be suppressed, and an assembling work man-hour can also be reduced. As a result, the cost of the automatic transmission can be reduced. Further, since the speed change operation unit is not arranged from the actuator case to the main body case, there is no concern that the assembling accuracy is lowered.

  Furthermore, in an aspect in which the shift and select shaft is arranged substantially parallel to the plane defined by the axis of the input shaft and the output shaft, one end of the shift and select shaft does not protrude greatly, and the mounting property to the vehicle is improved. it can.

  Further, in the aspect in which the actuator and the drive mechanism are arranged along the axial length direction of the input shaft and the output shaft, the size of each component can be minimized and the speed can be changed because there is a degree of freedom in component arrangement. The speed change operation unit can be configured by freely using the space around the machine case. As a result, it is possible to further prevent the transmission operation unit and the entire automatic transmission from becoming heavy.

  Further, in an aspect in which the shift and select shaft is provided inside the thick body portion of the transmission case and the actuator is provided outside the thin body portion, the outer shape of the automatic transmission becomes smart, Mountability can be further improved.

1 is a side cross-sectional view conceptually illustrating an automatic transmission according to an embodiment of the present invention. 1 is a front cross-sectional view conceptually illustrating an automatic transmission according to an embodiment of the present invention. It is a perspective view which shows a part of inner surface of the partition part of a transaxle case (transmission case). It is a perspective view which shows a part of upper part of a transmission case (transmission case). It is a partial front view which shows a part of shift and select axis | shaft and drive mechanism of the automatic transmission of embodiment. It is front sectional drawing of the range shown by FIG. It is front sectional drawing explaining the example of 1 structure of the automatic transmission evolved from the manual operation system of the prior art.

  The form for implementing this invention is demonstrated with reference to FIGS. FIG. 1 is a side sectional view conceptually illustrating an automatic transmission 1 according to an embodiment of the present invention, and FIG. 2 is a front sectional view. The automatic transmission 1 according to the embodiment shifts the output torque of the engine arranged on the right side of FIG. The automatic transmission 1 according to the embodiment includes a transmission case 2, a gear train 3, a shift and select shaft 4, an actuator 5, a drive mechanism 6, and the like.

  As shown in FIG. 1, the transmission case 2 includes a transaxle case 21 and a transmission case 24. The transaxle case 21 is formed of a partition wall portion 22 that constitutes a part of the transmission case 2 and a cylindrical portion 23 that extends from the peripheral edge of the partition wall portion 22 toward the engine and has an enlarged diameter.

  The transmission case 24 is formed integrally with a thick body portion 25, a thin body portion 26, and a step wall 27, and has a cylindrical shape having a step in the axial length direction in a part of the circumferential direction. The step wall 27 is a rectangular plate material that covers portions having different cross-sectional shapes between the thick body portion 25 and the thin body portion 26. The thick body portion 25 has a cylindrical shape with a relatively large cross-sectional area of the internal space. One end of the cylindrical body 25 (the right end in FIG. 1) is fastened and fixed to the periphery of the partition wall 22 of the transaxle case 21 using a fastening member. A part of the cylindrical other end (left end in FIG. 1) of the thick body part 25 is connected to the outer edge 271 of the step wall 27, and the remaining part of the other end is connected to the thin body part 26.

  The narrow body portion 26 has a cylindrical shape in which the cross-sectional area of the internal space is relatively small. A part of the cylindrical one end (the right end in FIG. 1) of the thin body portion 26 is connected to the inner edge 272 of the step wall 27, and the remaining end portion is connected to the thick body portion 25. The cylindrical other end 261 of the narrow body portion 26 is closed. An inner space 29 of the transmission case 2 is defined by the partition wall portion 22 of the transaxle case 21 and the transmission case 24.

  The gear train 3 is disposed in the internal space 29 of the transmission case 2. The gear train 3 includes an input shaft 31, an output shaft 32, a plurality of transmission gear sets (not shown), a plurality of synchromesh mechanisms, and the like. The input shaft 31 is disposed through the partition wall 22 of the transaxle case 21 and is rotatably supported by the transmission case 2. The output shaft 32 is arranged in parallel to the input shaft 31 and is rotatably supported by the transmission case 2.

  The plurality of transmission gear sets have different gear ratios, and can select, for example, either forward 5th speed or reverse 1st speed. Each of the fifth forward gear sets includes a driving gear provided on the input shaft 31 and a driven gear provided on the output shaft 32. One of the drive side gear and the driven side gear meshing with each other is rotatable with respect to the input shaft 31 or the output shaft 32. In the reverse gear set, a reverse gear is inserted between the driving gear and the driven gear.

  Synchromesh mechanisms (synchronizers) are provided for two transmission gear sets of the fifth forward speed, and a total of three sets of synchromesh mechanisms are provided. A fork shaft is attached to each synchromesh mechanism as a member for operating each synchromesh mechanism. The shift-and-select shaft 4 and the actuator 5 are used as a shift operation unit that performs a meshing and coupling operation on a selected transmission gear set by continuously selecting and shifting one of the three fork shafts, and also performing a reverse meshing release operation. Used.

  An output gear is fixed to the output shaft 32, and the output gear meshes with the gear of the differential 9 to transmit the torque after the shift. In addition, the structure of the gear train 3 is not limited to the above, It can comprise by applying a prior art suitably. For example, four sets of synchromesh mechanisms may be provided at the seventh forward speed.

  The shift and select shaft 4 is supported by two support members 81 and 82 erected on the partition wall 22 of the transaxle case 21, and is movable in the axial direction and rotatable around the shaft. As shown in FIG. 1, the shift and select shaft 4 is disposed in the internal space 29 of the thick body portion 25 of the transmission case 2 and is positioned above the input shaft 31 and the output shaft 32. As shown in FIG. 2, the axis C1 of the shift and select shaft 4 is arranged substantially in parallel with the plane S defined by the axis A1 of the input shaft 31 and the axis A2 of the output shaft 32. C1 intersects the axis A1 and the axis A2.

  The actuator 5 includes a selection motor 51 and a shift motor 52. As shown in FIG. 1, the actuator 5 is provided on the outer upper portion of the narrow body portion 26 of the transmission case 2. In FIG. 1, a selection motor 51 is disposed on the front side of the paper surface, and a shift motor 52 is disposed on the back side of the paper surface.

  The drive mechanism 6 includes a select drive mechanism 61 and a shift drive mechanism 62. The two drive mechanisms 61 and 62 are disposed through the stepped wall 27 of the transmission case 24. The selection drive mechanism 61 converts the output torque and rotation direction of the output shaft of the selection motor 51 and drives the shift and select shaft 4 to move in the axial direction. The shift drive mechanism 62 converts the output torque and rotation direction of the shift motor 52 and drives the shift and select shaft 4 to rotate about the axis.

  Further, a shift and select sensor 7 is provided on the outer upper portion of the thick body portion 25 of the transmission case 2. The shift and select sensor 7 detects the amount of movement of the shift and select shaft 4 in the axial direction and the amount of rotation about the axis. The shift operation unit is configured by the shift and select shaft 4, the actuator 5, the drive mechanism 6, and the shift and select sensor 7.

  Further, the speed change operation unit will be described in detail. FIG. 3 is a perspective view showing a part of the inner surface of the partition wall 22 of the transaxle case 21. The upper right of FIG. 3 corresponds to the upper side of the automatic transmission 1. As shown in the figure, a first support member 81, a third support member 83, and a second support member 82 are erected on the inner surface of the partition wall portion 22 in parallel with each other in the described order. The first support member 81 has a rectangular shape with a rounded tip. A first support hole 84 is formed near the tip of the first support member 81.

  The second support member 82 has a stepped shape, and a rectangular portion 822 having a narrow width and a rounded end is continuous on a wide base portion 821. The height of the rectangular portion 822 is substantially equal to the first support member 81. A second support hole 85 is formed near the tip of the rectangular portion 822 of the second support member 82, and a fourth support hole 87 is formed in the base portion 821. The third support member 83 has a rectangular shape with a rounded tip, and the height thereof is substantially equal to the base portion 821 of the second support member 82. A third support hole 86 is formed near the tip of the third support member 83.

  The shift and select shaft 4 and the drive mechanism 6 are assembled using the first to fourth support holes 84 to 87. The first support hole 84 and the second support hole 85 share the axis C1 and support the shift and select shaft 4. The third support hole 86 and the fourth support hole 87 share the axis C2, and support a gear shaft 65 described later. With respect to the axis C1, the axis C2 is parallel to the lower engine. The inner diameter D3 of the third bearing hole 86 is equal to the inner diameter D4 of the fourth bearing hole 87, whereas the inner diameter D1 of the first bearing hole 84 is larger and the inner diameter D2 of the second bearing hole 85 is larger (inner diameter D3). = Inner diameter D4 <inner diameter D1 <inner diameter D2).

  FIG. 4 is a perspective view showing a part of the upper part of the transmission case 24. As shown in the drawing, a closing hole 251 through which the rear end 47 of the shift-and-select shaft 4 can be seen from the outside is formed in the upper portion of the side surface of the thick body portion 25. The step wall 27 is provided with a select drive hole 273 and a shift drive hole 274 side by side. The select drive hole 273 is a part where the select motor 51 is attached and a part through which the select drive mechanism 61 penetrates into the internal space 29. Similarly, the shift drive hole 274 is a part where the shift motor 52 is attached and a part through which the shift drive mechanism 62 penetrates into the internal space 29.

  Further, a sensor hole 252 for receiving the shift and select sensor 7 is formed on the upper surface of the thick body portion 25. The detection unit of the shift and select sensor 7 extends toward the shift and select shaft 4. Note that a space 91 in the lower right part of FIG.

  Next, the configurations of the shift and select shaft 4 and the drive mechanism 6 will be described with reference to FIGS. FIG. 5 is a partial front view showing a part of the shift and select shaft 4 and the drive mechanism 6 of the automatic transmission 1 according to the embodiment. FIG. 6 is a front sectional view of the range shown in FIG. The shift and select shaft 4 includes a tip 41, a first supported portion 42, a fork drive portion 43, a final gear 44, a second supported portion 45, a rack gear 46, in order from the left side to the right side in FIGS. And a rear end 47.

  The first supported portion 42 is a portion whose outer diameter is reduced, and is fitted and supported in the first supporting hole 84 of the first supporting member 81. The fork drive unit 43 includes a known inner lever 431, an interlock plate 432, and the like, and detailed description thereof is omitted. The final gear 44 is fixed to the shaft main body of the shift and select shaft 4. The final gear 44 has a fan-shaped portion 441 that expands downward in FIGS. 4 and 5, and gear teeth 442 provided on the outer peripheral edge of the fan-shaped portion 441. The second supported portion 45 is supported by being fitted into the second supporting hole 85 of the second supporting member 82. The rack gear 46 is a gear in which a plurality of teeth that circulate around the axis are formed in the axial length direction.

  On the other hand, the selection drive mechanism 61 of the drive mechanism 6 includes an unillustrated reduction mechanism provided on the output shaft of the selection motor 51 and a pinion gear 63 provided on the output side of the reduction mechanism. As shown in FIG. 6, the pinion gear 63 meshes with the rack gear 46 of the shift and select shaft 4.

  The shift drive mechanism 62 of the drive mechanism 6 includes a bevel drive gear (not shown) provided on the output shaft of the shift motor 52 and an intermediate gear 64 driven by the bevel drive gear. The axis C2 of the intermediate gear 64 is hollow, and the gear shaft 65 is fitted into the hollow portion and fixed integrally with each other by a method such as press fitting. 5 and 6, the axis C <b> 2 of the intermediate gear 64 is located on the back side of the paper surface with respect to the axis C <b> 1 of the shift and select shaft 4.

  The gear shaft 65 is rotatably supported by fitting both ends of the gear shaft 65 into the third support hole 86 of the third support member 83 and the fourth support hole 87 of the second support member 82. Furthermore, snap rings 68 and 69 are respectively locked near both ends of the gear shaft 65 to prevent the gear shaft 65 from coming off. The intermediate gear 64 has a large-diameter bevel gear 66 and a small-diameter pinion gear 67. The bevel gear 66 meshes with the bevel drive gear and is driven to decelerate. The pinion gear 67 meshes with the gear teeth 442 of the final gear 44 of the shift and select shaft 4.

  In the speed change operation, when the selection motor 51 operates and the pinion gear 63 rotates, the rack gear 46 of the shift and select shaft 4 is driven in the axial direction. Then, the entire shift and select shaft 4 moves in the axial direction, and the inner lever 431 selects one of a plurality of fork shafts (not shown). At this time, the interlock plate 432 engages with other fork shafts that have not been selected and prohibits movement.

  Next, when the shift motor 52 operates to rotate the bevel drive gear, the final gear 44 of the shift and select shaft 4 is rotationally driven. Then, the entire shift and select shaft 4 rotates around the axis C1, and the fork shaft selected by the inner lever 431 is shifted. Thereby, the meshing / coupling operation of the selected transmission gear set is performed. Further, when the final gear 44 is rotationally driven in the reverse direction, a gear shifting gear set releasing operation is performed.

  Next, an assembly method of the automatic transmission 1 according to the embodiment will be described in the order of steps. In the first step, the gear train 3 including the input shaft 31, the output shaft 32, the transmission gear set, and the like is assembled to the transaxle case 21 without the transmission case 24.

  In the next second step, the shift and select shaft 4 is assembled. At this time, first, three members of the inner lever 431, the interlock plate 432, and the final gear 44 are temporarily placed between the first support member 81 and the second support member 82 of the transaxle case 21. Next, the tip 41 of the shaft body of the shift and select shaft 4 is inserted from the second support hole 85 of the second support member 82, and the tip 41 is the first support member while temporarily attaching the three members 431, 432, 44. It is inserted until it passes through the first support hole 84 of 81. Thereafter, the three members 431, 432, 44 are properly assembled to the shaft main body of the shift and select shaft 4.

  In the next third step, the intermediate gear 64 and the gear shaft 65 are assembled. At this time, first, the intermediate gear 64 is temporarily placed between the third support member 83 and the second support member 82. Next, the gear shaft 65 is inserted from the fourth support hole 87 of the second support member 82 and inserted through the hollow of the intermediate gear 64 to the third support hole 86 of the third support member 83. Thereafter, the intermediate gear 64 is finally fixed to the gear shaft 65, and the snap rings 68 and 69 are used to prevent the removal.

  In the next fourth step, the transaxle case 21 is covered with the transmission case 24 from the left direction in FIG. 1, and both the members 21 and 24 are fixed with fastening members. In the next fifth step, the actuator 5 (selection motor 51, shift motor 52), a part of the drive mechanism 6, and the shift and select sensor 7 are assembled to the transmission case 24.

  Next, the operation and effect of the automatic transmission 1 according to the above-described embodiment will be described in comparison with the prior art. FIG. 7 is a front cross-sectional view for explaining a configuration example of the automatic transmission 1Z evolved from the manual operation method of the prior art. In the prior art, a dedicated actuator case 2Z that accommodates the actuator 5Z and the drive mechanism 6Z is required separately from the transmission case 24Z. For this reason, in comparison with the original manual operation method, there have been problems such as a significant increase in the number of parts, an increase in the weight of the automatic transmission 1Z, and an increase in the external dimensions of the automatic transmission 1Z. Further, the shift and select shaft 4Z is disposed so as to intersect with a plane defined by the input shaft and the output shaft, and the rear end 47Z protrudes greatly from the transmission case 24Z and has a distorted shape. For this reason, the mounting property to a vehicle has fallen.

  Further, in the prior art, it is necessary to assemble the actuator case 2Z alone before assembling it to the transmission case 24Z in a sub-assembly state. For this reason, the work man-hours increased significantly, and a production line for subassembly was required, and the work contents were not easy. For example, the shift and select shaft 4Z is supported by a support portion 281 provided on the transmission case 24Z and a support portion 282 provided on the actuator case 2Z. Similarly, the intermediate gear 64Z that meshes with the final gear 44Z of the shift and select shaft 4Z is also supported across the transmission case 24Z and the actuator case 2Z. For this reason, it is difficult to assemble the actuator case 2Z to the transmission case 24Z with the mating surfaces J1-J2. In addition, there is a concern that the assembling accuracy may be lowered due to a shift or inclination of the shaft center between the two support portions 281 and 282 on the actuator case 2Z side and the transmission case 24Z side.

  On the other hand, in the automatic transmission 1 according to the embodiment, the shift and select shaft 4 is disposed in the internal space 29 of the transmission case 2 together with the gear train 3, and the actuator 5 is provided outside the transmission case 2. Therefore, unlike the prior art, the shift and select shaft 4 and its surrounding parts are directly assembled in the internal space 29 of the transmission case 2, and then the actuator 5 is directly assembled on the outside of the transmission case 2. A shift operation unit can be configured. Therefore, the actuator case 2Z, which has been conventionally required, becomes unnecessary. Thereby, the number of parts of the speed change operation unit can be reduced, the increase in the thickness of the speed change operation unit and the automatic transmission 1 can be suppressed, and the number of assembling work steps can be reduced. As a result, the cost of the automatic transmission 1 can be reduced. In addition, since the speed change operation unit is not disposed across the transmission case 2 from the actuator case 2Z, there is no concern that the assembling accuracy is lowered.

  Further, the shift and select shaft 4 is disposed inside the thick body portion 25 substantially parallel to the plane S defined by the axes A1 and A2 of the input shaft 31 and the output shaft 32. As a result, the rear end 47 of the shift and select shaft 4 does not protrude significantly. The actuator 5 and the drive mechanism 6 are provided outside the narrow body 26 along the axial length direction of the input shaft 31 and the output shaft 32. As a result, the degree of freedom of component placement is increased, the size of each component can be minimized, and the speed change operation unit can be configured by freely using the space around the transmission case. By these comprehensive effects, the external shape of the automatic transmission 1 becomes smart, and the mounting property to the vehicle can be improved.

  The arrangement of the shift and select shaft 4 in the internal space 29 of the transmission case 2, the arrangement of the actuator 5 outside the transmission case 2, the configuration of the drive mechanism 6 and the like have a degree of design freedom, and are changed as appropriate. be able to. Various other applications and modifications are possible for the present invention.

1: Automatic transmission 2: Transmission case 21: Transaxle case 22: Bulkhead part 24: Transmission case 25: Thick body part 26: Narrow body part 27: Step wall 29: Internal space 3: Gear train 31: Input shaft 32: Output shaft 4: Shift and select shaft 41: Tip 42: First supported portion 43: Fork drive portion 44: Final gear 45: Second supported portion 46: Rack gear 47: Rear end 5: Actuator 6: Drive mechanism 63: Pinion gear 64: Intermediate gear 65: Gear shaft 66: Bevel gear 67: Pinion gear 7: Shift and select sensor 81: First bearing member 82: Second bearing member 83: Third bearing member 1Z: Automatic transmission of prior art

Claims (4)

A transmission case, a gear train disposed in an internal space of the transmission case, and any one of a plurality of transmission gear sets can be selectively meshed and coupled, and the transmission gear set by axial movement and rotation around the axis An automatic transmission including a shift and select shaft that performs a selection operation and a meshing connection operation, and an actuator that drives the shift and select shaft,
The shift and select shaft is supported by a support portion provided in an internal space of the transmission case, and is disposed in the internal space together with the gear train.
The actuator is an automatic transmission that is provided outside the transmission case and drives the shift and select shaft through a drive mechanism that penetrates the transmission case. The gear train has an input shaft and an output shaft arranged in parallel with each other,
2. The automatic transmission according to claim 1, wherein the shift and select shaft is disposed substantially parallel to a plane defined by an axis of the input shaft and an axis of the output shaft. The gear train has an input shaft and an output shaft arranged in parallel with each other,
The automatic transmission according to claim 1 or 2, wherein the actuator and the drive mechanism are disposed along the axial length direction of the input shaft and the output shaft. The transmission case has a thick body portion with a large cross-sectional area of the internal space and a thin body portion with a small cross-sectional area of the internal space,
The shift and select shaft is provided inside the thick body,
The automatic transmission according to any one of claims 1 to 3, wherein the actuator is provided outside the narrow body portion.

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