JP2018105476A - Automatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic transmission capable of improving its mountability to a vehicle while simplifying a structure of a transmission unit.SOLUTION: A transmission unit 30 fixed to an outer wall of a transmission case 2 comprises: a hydraulic pressure generating device 32; a clutch operating device 31 for operating a clutch 5 by hydraulic pressure generated by the hydraulic pressure generating device 32; a transmission actuator 33 for operating a shift-and-select shaft 10 in a shift direction and a selection direction by hydraulic pressure generated by the hydraulic pressure generating device 32; and a base plate 35 for fixing both the hydraulic pressure generating device 32 and the transmission actuator 33 to an upper wall 4c of a transmission case 4. The clutch operating device 31 comprises: a clutch release member 20 mounted on an input shaft 6 to operate the clutch 5 by hydraulic pressure generated by the hydraulic pressure generating device 32; and a hydraulic pipe 23 for connecting the clutch release member 20 with the hydraulic pressure generating device 32. The base plate 35 has an operation oil supply part 35D for supplying operation oil from the hydraulic pressure generating device 32 to the hydraulic pipe 23.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an automatic transmission mounted on a vehicle.

  In an automatic transmission mounted on a vehicle such as an automobile, automatic transmission such as AT (Automatic Transmission) can be performed by automatically performing a gear shifting operation performed by a driver using an actuator in MT (Manual Transmission). AMT (Automated Manual Transmission) is known.

  As this type of conventional AMT, for example, one described in Patent Document 1 is known. In this AMT, a shift unit that drives a shift-and-select shaft in the axial direction is installed at the upper part of the transmission case.

  The shift unit further includes a clutch release arm that operates the clutch and a clutch actuator that operates the clutch release arm. The clutch release arm and the clutch actuator are provided between the upper surface of the transmission case and the base plate. ing.

Japanese Patent Laid-Open No. 2006-102508

  In such an automatic transmission, it is necessary to install the clutch actuator in accordance with the operation direction of the clutch release arm, the configuration of the base plate may be complicated, and there is still room for improvement.

  Furthermore, since the clutch release arm and the clutch actuator are installed between the upper surface of the transmission case and the base plate, the mounting position of the shift unit with respect to the transmission case may be increased. For this reason, the mountability of the automatic transmission with respect to the vehicle may be deteriorated, and there is still room for improvement.

  The present invention has been made paying attention to the above-described problems, and an object of the present invention is to provide an automatic transmission that can be easily mounted on a vehicle while simplifying the structure of the transmission unit. is there.

  The present invention relates to a transmission case, an input shaft that is housed in the transmission case and receives power from the internal combustion engine, and is housed in the transmission case and transmits power between the internal combustion engine and the input shaft. A clutch capable of transmitting and interrupting transmission and a shift and select shaft for performing a shift operation, and an outer wall of the transmission case, and automatically operating the clutch and the shift and select shaft for shifting. A transmission unit that performs the shift by the hydraulic pressure generator, a clutch operating device that operates the clutch by the hydraulic pressure generated by the hydraulic pressure generator, and the hydraulic pressure generated by the hydraulic pressure generator. Shift-and-select operating device for operating the and-select shaft in the shift direction and the select direction, and the hydraulic pressure generator An automatic transmission comprising a base plate for fixing the clutch operating device and the shift and select operating device to an outer wall of the transmission case, wherein the clutch operating device is installed on the input shaft and generates the hydraulic pressure. A clutch release member that operates the clutch by hydraulic pressure generated by a device; and a hydraulic pipe that connects the clutch release member and the hydraulic pressure generator; and the base plate is connected to the hydraulic pipe by the hydraulic pressure generator. It has the hydraulic oil supply part which supplies hydraulic oil from.

  As described above, according to the present invention, it is possible to improve the mountability of the automatic transmission to the vehicle while simplifying the structure of the transmission unit.

FIG. 1 is a perspective view of an automatic transmission according to an embodiment of the present invention. FIG. 2 is a plan view of an automatic transmission according to an embodiment of the present invention. FIG. 3 is a front view of an automatic transmission according to an embodiment of the present invention. FIG. 4 is a right side view of an automatic transmission according to an embodiment of the invention. FIG. 5 is a left side view of an automatic transmission according to an embodiment of the invention. FIG. 6 is an internal structure diagram of the automatic transmission with the transmission case removed in the automatic transmission according to one embodiment of the present invention. FIG. 7 is a perspective view of a base plate attached to an automatic transmission according to an embodiment of the present invention. FIG. 8 is a diagram showing a configuration of an oil pressure generator and a gear shift actuator of an automatic transmission and an oil flow according to an embodiment of the present invention.

An automatic transmission according to an embodiment of the present invention includes a transmission case, an input shaft that is housed in the transmission case and receives power from the internal combustion engine, and is housed in the transmission case, and the internal combustion engine and the input shaft. A clutch and shift and select shaft that can transmit power to and cut off transmission, and a shift and select shaft that is mounted on the outer wall of the transmission case, and automatically operates the clutch and shift and select shaft The transmission unit includes a transmission unit that performs a shift, and the transmission unit shifts and selects the hydraulic pressure generator, the clutch operating device that operates the clutch by the hydraulic pressure generated by the hydraulic pressure generator, and the hydraulic pressure generated by the hydraulic pressure generator. A shift-and-select operating device for operating the shaft in the shift direction and the select direction, a hydraulic pressure generating device, a clutch operating device, An automatic transmission having a base plate for fixing the shift and select operating device to the outer wall of the transmission case. The clutch operating device is installed on the input shaft and operates the clutch by the hydraulic pressure generated by the hydraulic pressure generating device. And a hydraulic pipe that connects the clutch release member and the hydraulic pressure generator, and the base plate has a hydraulic oil supply section that supplies hydraulic oil to the hydraulic pipe from the hydraulic pressure generator.
Thereby, the mounting property of the automatic transmission with respect to the vehicle can be improved while simplifying the structure of the transmission unit.

Hereinafter, embodiments of an automatic transmission according to the present invention will be described with reference to the drawings.
1 to 8 are diagrams showing an automatic transmission according to an embodiment of the present invention. In FIG. 1 to FIG. 7, the up, down, left, and right directions represent the directions viewed from the driver on the vehicle.

First, the configuration will be described.
1 to 3, an automatic transmission 1 made of, for example, AMT is mounted in an engine room (not shown) of a vehicle. The automatic transmission 1 includes a transmission case 2, and the transmission case 2 includes a clutch housing 3 and a transmission case 4 adjacent to the clutch housing 3.

  The clutch housing 3 accommodates a starting clutch 5 (see FIG. 4). In FIG. 6, an input shaft 6, a first counter shaft 7, a second counter shaft 8 and a differential device 9 are accommodated in the transmission case 4. The input shaft 6, the first counter shaft 7, and the second counter shaft 8 are installed so that their axial directions are parallel to each other.

  One end of the input shaft 6 protrudes from the transmission case 4 to the clutch housing 3, and power is transmitted to the input shaft 6 from the internal combustion engine 50 (see FIG. 2). The input shaft 6 is provided with an input gear 6A for shifting, and the input gear 6A is installed in the axial direction of the input shaft 6 by a number corresponding to the gear position.

  The first counter shaft 7 and the second counter shaft 8 are respectively provided with a first counter gear 7A and a second counter gear 8A for shifting, and the first counter gear 7A and the second counter gear 8A are provided. 8A meshes with the input gear 6A.

  Each of the first counter shaft 7 and the second counter shaft 8 is provided with final drive gears 7B and 8B (shown by phantom lines in FIG. 5). The final drive gears 7B and 8B are connected to the differential device 9. It meshes with the final driven gear 9A.

  The differential device 9 includes a final driven gear 9A, a differential case 9B in which the final driven gear 9A is attached to the outer periphery, and a differential gear (not shown) accommodated in the differential case 9B.

  A shift and select shaft 10 is accommodated in the transmission case 4. The shift and select shaft 10 has a vertical axis perpendicular to the axis of the input shaft 6 and is attached to a shift case 4C provided at the top of the transmission case 4 so as to be rotatable and movable in the vertical direction. Yes.

The first counter shaft 7, the second counter shaft 8, and the final driven gear 9 </ b> A are installed on the opposite side of the shift and select shaft 10 with respect to the input shaft 6.
The shift and select shaft 10 is provided with inner levers 10 </ b> A and 10 </ b> B that are spaced apart from each other in the vertical direction. The inner lever 10A can be selectively engaged with the shift pieces 12A and 12B, and the inner lever 10B can be selectively engaged with the shift pieces 12C and 12D.

  Shift pieces 12A to 12D are connected to shift shafts 13A to 13D, respectively. The shift shafts 13A to 13D are attached to the transmission case 4 so as to be movable along the axial direction of the input shaft 6.

  Shift forks 14A to 14D are fixed to shift shafts 13A to 13D, and shift forks 14A to 14D are respectively connected to meshing clutches (not shown). The meshing clutch is provided on the axis line of the first counter shaft 7 and the second counter shaft 8 so as to be movable in the axial direction of the first counter shaft 7 and the second counter shaft 8.

  In the automatic transmission 1 according to the present embodiment, a select operation is performed when the shift and select shaft 10 moves in the vertical direction, and a shift operation is performed when the shift and select shaft 10 rotates at the select position of a predetermined shift stage. .

  Specifically, the shift and select shaft 10 moves in the vertical direction, and the inner levers 10A and 10B are fitted to any one of the shift pieces 12A to 12D at a predetermined shift speed, and the shift and select shaft 10 rotates. Then, any one of the shift shafts 13 </ b> A to 13 </ b> D moves in the axial direction of the input shaft 6.

  At this time, any one of the shift forks 14A to 14D is engaged, and the clutch is moved in the axial direction of the first counter shaft 7 or the second counter shaft 8 to move the first counter gear 7A or the second counter gear 8A. It is connected to the first counter shaft 7 or the second counter shaft 8.

  As a result, a predetermined shift speed is established between the first counter gear 7A connected to the first counter shaft 7 or the second counter shaft 8 or the input gear 6A engaged with the second counter gear 8A.

  When a predetermined shift speed is established, the power of the internal combustion engine 50 is transmitted from the input shaft 6 to the first counter shaft 7 or the second counter shaft 8 via the first counter gear 7A or the second counter gear 8A. The

  At this time, after power is transmitted from the first counter shaft 7 or the second counter shaft 8 to the final driven gear 9A via the final drive gears 7B and 8B, left and right not shown from the differential gear built in the differential case 9B. Power is transmitted to left and right drive wheels (not shown) via the drive shaft. As a result, the left and right drive wheels rotate differentially.

  The transmission case 4 constitutes the transmission case of the present invention. The first counter gear 7A and the second counter gear 8A constitute a counter gear of the present invention, and the final driven gear 9A constitutes a final gear of the present invention.

  The input gear 6A and the first counter gear 7A constitute the transmission gear and the first transmission gear of the present invention, and the input gear 6A and the second counter gear 8A include the transmission gear and the second counter gear of the present invention. A transmission gear is configured.

  On the other hand, the internal combustion engine 50 includes a crankshaft (not shown) and a flywheel (not shown) provided on the crankshaft. The clutch 5 includes a friction plate (not shown) provided at the end of the input shaft 6.

  The clutch 5 transmits power from the crankshaft to the input shaft 6 by bringing the friction plate into contact with the flywheel, and transmits power transmitted from the crankshaft to the input shaft 6 by separating the friction plate from the flywheel. Cut off.

  1 and 4, a clutch release member 20 is accommodated in the clutch housing 3. The clutch release member 20 includes a release bearing 21 and a release cylinder 22, and the release bearing 21 and the release cylinder 22 are installed on the input shaft 6.

  Hydraulic oil is introduced into the release cylinder 22 through a hydraulic pipe 23. The release bearing 21 is actuated by the hydraulic pressure introduced into the release cylinder 22 to bring the friction plate of the clutch 5 into contact with or away from the flywheel. As a result, power is transmitted from the internal combustion engine 50 to the input shaft 6 and the power is shut off. The release bearing 21, the release cylinder 22 and the hydraulic piping 23 of the present embodiment constitute the clutch operating device 31 of the present invention.

  In FIG. 1, a hydraulic pressure generating device 32, a transmission actuator 33, and a control device 34 are provided on the upper portion of the transmission case 2. The hydraulic pressure generating device 32, the transmission actuator 33 and the control device 34 are attached to a base plate 35, and the base plate 35 is attached to the upper wall 4 c of the transmission case 4. Note that the shift case 4C constitutes a part of the transmission case 4, and the upper wall 4c of the transmission case 4 includes the upper surface of the shift case 4C.

The hydraulic pressure generator 32 includes a reservoir tank 36, a motor 37, an oil pump 38, and an accumulator 39.
The reservoir tank 36 stores hydraulic oil. The oil pump 38 is driven by the motor 37 to supply the hydraulic oil stored in the reservoir tank 36 to the accumulator 39 through an oil passage (not shown) formed in the base plate 35. The accumulator 39 stores the pressure of the hydraulic oil and supplies high pressure hydraulic pressure to the speed change actuator 33 through an oil passage (not shown) formed in the base plate 35.

  In FIG. 7, the base plate 35 is formed in a plate shape extending in the horizontal direction, which is a predetermined direction. The base plate 35 is provided with an accumulator attachment portion 35A to which an accumulator 39 is attached and a motor attachment portion 35B to which a motor 37 is attached. A communication hole 35 </ b> C is formed in the base plate 35, and the communication hole 35 </ b> C constitutes an oil passage that connects the reservoir tank 36 and the oil pump 38.

  The base plate 35 is formed with a speed change actuator mounting portion 35E to which the speed change actuator 33 is attached, and the speed change actuator mounting portion 35E has an opening 35e. The shift and select shaft 10 is inserted through the opening 35e, and the upper portion of the shift and select shaft 10 protrudes upward from the upper surface of the base plate 35 through the opening 35e.

A select lever and a shift lever (not shown) are provided above the shift and select shaft 10.
In FIG. 8, the transmission actuator 33 includes a clutch operation solenoid 40, a select operation solenoid 41, a shift operation solenoid 42, a select actuator 43, and a shift actuator 44.

  3 and 7, the base plate 35 is formed with a hydraulic oil supply portion 35D, and the hydraulic oil supply 23 is attached to the hydraulic oil supply portion 35D. An oil passage 35d is formed in the hydraulic oil supply unit 35D, and the oil passage 35d communicates with the accumulator 39 through an oil passage (not shown) formed in the base plate 35. As a result, the high hydraulic pressure of the accumulator 39 is supplied to the release cylinder 22 through the oil passage 35d and the hydraulic pipe 23 of the hydraulic oil supply unit 35D.

  The clutch operation solenoid 40 operates the clutch 5 by supplying high pressure oil pressure generated by the accumulator 39 from the oil passage 35d of the hydraulic oil supply unit 35D to the release cylinder 22 via the hydraulic pipe 23.

  The select operation solenoid 41 adjusts and supplies the high pressure hydraulic pressure generated by the accumulator 39 to the select actuator 43, and the shift operation solenoid 42 adjusts and supplies the high pressure hydraulic pressure generated by the accumulator 39 to the shift actuator 44.

  The select actuator 43 operates the shift and select shaft 10 in the select direction by pressing the select lever of the shift and select shaft 10 based on the hydraulic pressure supplied from the select operation solenoid 41.

  The shift actuator 44 operates the shift and select shaft 10 in the shift direction by pressing the shift lever of the shift and select shaft 10 based on the hydraulic pressure supplied from the shift operation solenoid 42. The speed change actuator 33 of this embodiment constitutes the shift and select operation device of the present invention.

  The control device 34 includes a microcomputer including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The control device 34 detects, for example, detection information of a shift position sensor (not shown) that detects a shift operation of a shift lever (not shown) provided in the driver's seat, detection information of a vehicle speed sensor (not shown) that detects the vehicle speed, and the depression amount of the accelerator pedal. A shift point is determined based on detection information from an accelerator sensor or the like.

  When determining the shift point, the control device 34 operates the clutch operation solenoid 40 to supply hydraulic pressure to the release cylinder 22. When hydraulic pressure is supplied to the release cylinder 22, the release bearing 21 separates the friction plate of the clutch 5 from the flywheel, so that the power transmitted from the crankshaft to the input shaft 6 is cut off.

  When the supply of hydraulic pressure to the release cylinder 22 is stopped, the release bearing 21 brings the friction plate of the clutch 5 into contact with the flywheel, whereby power is transmitted from the crankshaft to the input shaft 6.

  When the clutch 5 is disengaged, the control device 34 controls the select operation solenoid 41 and the shift operation solenoid 42 to drive the shift actuator and the select actuator, thereby operating the shift and select shaft 10 in the axial direction and around the axis. To change the speed.

  In FIG. 4, a clutch stroke sensor 24 is provided on the input shaft 6, and the clutch stroke sensor 24 is connected to the control device 34 via a wiring 24a. The clutch stroke sensor 24 detects the movement position of the release cylinder 22 and outputs detection information to the control device 34. The control device 34 determines the state of the clutch 5 (for example, the clutch 5 is in a half-clutch state) based on the detection information of the clutch stroke sensor 24.

  The clutch operating device 31, the hydraulic pressure generating device 32, the transmission actuator 33, the control device 34, and the base plate 35 of this embodiment constitute a transmission unit 30, and the hydraulic pressure generating device 32, the transmission actuator 33, and the base plate 35 are included in the present invention. The transmission unit is configured.

  In FIG. 6, when the automatic transmission 1 is viewed from the axial direction of the input shaft 6, a bulging portion 3 </ b> A is formed in the clutch housing 3, and the bulging portion 3 </ b> A extends in the vertical direction of the transmission case 4. It bulges outward from the vertical wall 4A.

  An extending portion 35a is formed at an end in the extending direction of the base plate 35. The extending portion 35a is outside the vertical wall 4A of the transmission case 4 and on the side 3a of the bulging portion 3A. It extends.

  That is, the extending part 35a is located above a space surrounded by the vertical wall 4A of the transmission case 4 and the side 3a of the bulging part 3A. The vertical wall 4A of the transmission case 4 of the present embodiment constitutes the outer wall of the transmission case of the present invention, and the side 3a constitutes the side of the bulging portion of the present invention.

  In FIG. 1, the hydraulic pressure generating device 32 has a reservoir tank 36 and a motor 37 installed on the upper surface side of the extending portion 35a, and an oil pump 38 and an accumulator 39 installed on the lower surface side of the extending portion 35a.

  The occupation area of the hydraulic pressure generating device 32 on the base plate 35 is the largest on the upper surface side of the extending portion 35a. Specifically, the occupied area of the reservoir tank 36 and the motor 37 is the largest on the upper surface side of the extending portion 35a. The hydraulic oil supply unit 35D is installed on the lower surface side of the extension part 35a so as to extend downward from the extension part 35a.

  In FIG. 3, an opening 3B is formed in the clutch housing 3, and the opening 3B is formed below the extending portion 35a. A hydraulic pipe 23 is inserted through the opening 3B, and the hydraulic pipe 23 is introduced into the clutch housing 3 through the opening 3B.

  According to the automatic transmission 1 of the present embodiment having such a configuration, a transmission unit that is attached to the upper part of the transmission case 2 and performs a shift by automatically operating the clutch 5 and the shift and select shaft 10. 30.

  The transmission unit 30 shifts the shift-and-select shaft 10 in the shift direction by the hydraulic pressure generating device 32, the clutch operating device 31 that operates the clutch 5 by the hydraulic pressure generated by the hydraulic pressure generating device 32, and the hydraulic pressure generated by the hydraulic pressure generating device 32. And a shift actuator 33 operated in the select direction. Further, the transmission unit 30 includes a base plate 35 that fixes the hydraulic pressure generating device 32 and the transmission actuator 33 to the upper wall 4 c of the transmission case 4.

  The clutch operating device 31 is installed on the input shaft 6, and the clutch release member 20 that operates the clutch 5 by the hydraulic pressure generated by the hydraulic pressure generating device 32, and the hydraulic piping that connects the clutch release member 20 and the hydraulic pressure generating device 32. The base plate 35 has a hydraulic oil supply unit 35D that supplies hydraulic oil from the hydraulic pressure generator 32 to the hydraulic pipe 23.

  Thereby, the clutch 5 can be operated by the release cylinder 22 provided on the input shaft 6, and it is unnecessary to install a hydraulic cylinder for operating the clutch 5 on the base plate 35. For this reason, the structure of the base plate 35 can be simplified and the structure of the transmission unit 30 can be simplified.

  Further, since it is unnecessary to install a release arm or a hydraulic cylinder for operating the clutch 5 between the base plate 35 and the transmission case 2, the mounting height of the transmission unit 30 with respect to the transmission case 2 is reduced. Thus, the automatic transmission 1 can be reduced in size. For this reason, the space which the automatic transmission 1 occupies in an engine room can be reduced, and the mounting property of the automatic transmission 1 with respect to a vehicle can be improved.

  Further, according to the automatic transmission 1 of the present embodiment, the transmission case 2 includes the clutch housing 3 that houses the clutch 5, and the transmission case 4 that is adjacent to the clutch housing 3 and houses the shift and select shaft 10. It is configured to include. When the automatic transmission 1 is viewed from the axial direction of the input shaft 6, the clutch housing 3 has a bulging portion 3 </ b> A that bulges outward from the vertical wall 4 </ b> A of the transmission case 4.

  The base plate 35 has an extending portion 35a that extends outward from the vertical wall 4A of the transmission case 4 and extends to the side 3a of the bulging portion 3A, and supplies the hydraulic pressure generator 32 and hydraulic oil to the extending portion 35a. Part 35D is installed.

Accordingly, the hydraulic oil supply unit 35D can be installed close to the clutch housing 3, the length of the hydraulic pipe 23 connecting the hydraulic oil supply unit 35D and the release cylinder 22 is shortened, and the structure of the hydraulic pipe 23 is achieved. Can be simplified.
Further, the hydraulic pressure generating device 32 and the hydraulic oil supply unit 35D can be installed adjacent to each other, the base plate 35 can be more effectively downsized, and the transmission unit 30 can be more downsized more effectively.

Further, according to the automatic transmission 1 of the present embodiment, the base plate 35 is formed in a plate shape extending in the horizontal direction and is installed on the upper portion of the transmission case 2. The extending portion 35a is configured from an end portion in the extending direction of the base plate 35 and extends outward from the vertical wall 4A of the transmission case 4, and a hydraulic oil supply portion 35D is provided on the lower surface side of the extending portion 35a. ing.
Further, an opening 3B is formed in the clutch housing 3 below the extending portion 35a, and the hydraulic pipe 23 is introduced into the clutch housing 3 through the opening 3B.

  Thereby, the hydraulic oil supply part 35D provided in the base plate 35 and the opening part 3B for introducing the hydraulic pipe 23 into the clutch housing 3 can be installed close to each other. For this reason, the length of the hydraulic pipe 23 connecting the hydraulic oil supply unit 35D and the release cylinder 22 can be shortened more effectively, and the structure of the hydraulic pipe 23 can be simplified more effectively.

  Further, according to the automatic transmission 1 of the present embodiment, the occupation area of the hydraulic pressure generating device 32 including the reservoir tank 36 and the motor 37 on the base plate 35 is the largest on the upper surface side of the extending portion 35a.

  Thus, in the hydraulic pressure generator 32, the reservoir tank 36 and the motor 37 are installed on the upper surface side of the extending portion 35a, and the hydraulic oil supply unit 35D, the oil pump 38, and the accumulator 39 are installed on the lower surface side of the extending portion 35a. can do. For this reason, the base plate 35 can be reduced more effectively, and the transmission unit 30 can be reduced more effectively.

Further, according to the automatic transmission 1 of the present embodiment, the transmission case 4 is connected to the input shaft 6 via the input shaft 6 and the input shaft 6 via the input gear 6A and the first counter gear 7A. The final counter shaft 8 connected to the input shaft 6 via the input gear 6A and the second counter gear 8A, and the final power to which the power of the first counter shaft 7 and the second counter shaft 8 is transmitted. A driven gear 9A is accommodated.
In addition, the first counter shaft 7, the second counter shaft 8, and the final driven gear 9 </ b> A are installed on the side opposite to the shift and select shaft 10 with respect to the input shaft 6.

  Accordingly, the base plate 35 can be reduced in size by bringing the shift and select shaft 10 closer to the extending portion 35a. For this reason, the transmission unit 30 is a transformer in which a transmission mechanism including an input shaft 6 having a transmission gear, a first counter shaft 7 and a second counter shaft 8 and a differential device 9 are integrally accommodated in the transmission case 2. When applied to the axle type automatic transmission 1, the automatic transmission 1 can be more effectively downsized.

Further, according to the automatic transmission 1 of the present embodiment, the counter shaft is composed of two axes, the first counter shaft 7 and the second counter shaft 8. Thereby, the transaxle type automatic transmission 1 can be further downsized, and the automatic transmission 1 can be more effectively downsized by attaching the transmission unit 30 to the downsized automatic transmission 1.
The automatic transmission 1 according to the present embodiment is an AMT, but the automatic transmission may be an AT (Automatic Transmission).

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

  DESCRIPTION OF SYMBOLS 1 ... Automatic transmission, 2 ... Transmission case, 3 ... Clutch housing, 3A ... Expansion part, 3B ... Opening part, 3a ... Side (The side of the expansion part 4) Transmission wall, 4A ... Vertical wall (transmission case vertical wall), 4c ... Upper wall (transmission case outer wall), 5 ... Clutch, 6 ... Input shaft, 6A ... Input gear (transmission gear, first transmission gear, second transmission gear), 7 ... first counter shaft, 7A ... first counter gear (transmission gear, first transmission) Gear), 8 ... second counter shaft, 8A ... second counter gear (transmission gear, second transmission gear), 9 ... differential device, 9A ... final driven gear (final gear) 10 ... shift and select shaft, 20 ... clutch release member (clutch operating device), 21 ... release bearing (clutch release) ), 22 ... Release cylinder (clutch release member), 23 ... Hydraulic piping, 30 ... Transmission unit, 31 ... Clutch operating device, 32 ... Hydraulic generator, Transmission unit), 33 ... Shifting actuator (shift and select operation device, shifting unit), 35 ... Base plate (shifting unit), 35D ... Hydraulic oil supply part, 35a ... Extension part, 36 ... Reservoir tank (Hydraulic pressure generator), 37 ... motor (hydraulic pressure generator), 38 ... oil pump (hydraulic pressure generator), 39 ... accumulator, 50 ... internal combustion engine

Claims (6)

A transmission case;
An input shaft housed in the transmission case and to which power is transmitted from the internal combustion engine;
A clutch housed in the transmission case, capable of transmitting power between the internal combustion engine and the input shaft, and capable of interrupting transmission and a shift and select shaft for performing a shift operation;
A transmission unit that is attached to an outer wall of the transmission case, and that performs a shift by automatically operating the clutch and the shift and select shaft;
The transmission unit includes a hydraulic pressure generating device, a clutch operating device that operates the clutch by the hydraulic pressure generated by the hydraulic pressure generating device, and a shift direction and a select direction of the shift and select shaft by the hydraulic pressure generated by the hydraulic pressure generating device. An automatic transmission comprising a shift and select operating device that operates in a direction, and a base plate that fixes the hydraulic pressure generating device and the shift and select operating device to an outer wall of the transmission case,
The clutch operating device is installed on the input shaft, and a clutch release member that operates the clutch by hydraulic pressure generated by the hydraulic pressure generating device; a hydraulic pipe that connects the clutch release member and the hydraulic pressure generating device; With
The automatic transmission according to claim 1, wherein the base plate includes a hydraulic oil supply unit that supplies hydraulic oil to the hydraulic piping from the hydraulic pressure generator. The transmission case includes a clutch housing that houses the clutch, and a transmission case that is adjacent to the clutch housing and houses the shift and select shaft.
When the automatic transmission is viewed from the axial direction of the input shaft, the clutch housing has a bulging portion that swells outward from a vertical wall extending in the vertical direction of the transmission case,
The base plate has an extending portion that extends outward from the outer wall of the transmission case and extends to the side of the bulging portion;
The automatic transmission according to claim 1, wherein the hydraulic pressure generating device and the hydraulic oil supply unit are installed in the extending part. The base plate is formed in a plate shape extending in a predetermined direction and is installed on the upper part of the transmission case,
The extending portion is configured from an end portion in the extending direction of the base plate and extends outward from the vertical wall of the transmission case,
The hydraulic oil supply section is provided on the lower surface side of the extension section,
Below the extension, an opening is formed in the clutch housing,
The automatic transmission according to claim 2, wherein the hydraulic pipe is introduced into the clutch housing through the opening.   4. The automatic transmission according to claim 2, wherein an area occupied by the hydraulic pressure generating device on the base plate is largest on an upper surface side of the extending portion. 5. The transmission case contains a counter shaft connected to the input shaft via a transmission gear, and a final gear to which power of the counter shaft is transmitted,
5. The automatic transmission according to claim 1, wherein the counter shaft and the final gear are disposed on the opposite side of the shift and select shaft with respect to the input shaft. Machine. The counter shaft is composed of a first counter shaft and a second counter shaft,
The transmission gear is composed of a first transmission gear that connects the first counter shaft and the input shaft, and a second transmission gear that connects the second counter shaft and the input shaft. The automatic transmission according to claim 5, wherein: