CN108253118B

CN108253118B - Automatic transmission

Info

Publication number: CN108253118B
Application number: CN201711433306.6A
Authority: CN
Inventors: 高桥均矢
Original assignee: Suzuki Motor Corp
Current assignee: Suzuki Motor Corp
Priority date: 2016-12-28
Filing date: 2017-12-26
Publication date: 2021-01-05
Anticipated expiration: 2037-12-26
Also published as: FR3061253B1; DE102017223314A1; FR3061253A1; CN108253118A

Abstract

Provided is an automatic transmission which can stably mount a transmission unit to a transmission case without greatly modifying an existing transmission case and can improve productivity. In an automatic transmission (1), a plurality of screw holes are provided in a transmission case, and a plurality of bosses having bolt holes are provided in a bottom plate. The gear shifting box (5) is provided with: bosses (5A) to (5E) formed with bolt holes for inserting bolts (19A) to (19E) fastened to the screw holes of the transmission case by the bolts (19A) to (19E); and bosses (5F) to (5I), the boss of the base plate being fastened to the bosses (5F) to (5I) by bolts, the bosses (5F) to (5I) being separated from the transmission case.

Description

Automatic transmission

Technical Field

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

Background

In general, as an Automatic Transmission mounted in a vehicle such as an automobile, there is known an AMT (Automated Manual Transmission) which automatically performs a speed change operation by a driver in an MT (Manual Transmission) by an actuator and can perform an Automatic speed change as in an AT (Automatic Transmission).

As such an AMT, an AMT described in patent document 1, for example, is known. The AMT is provided with a shift unit that automatically drives a shift select shaft at an upper portion of a transmission case.

The shift unit is provided with: a select actuator that operates the shift select shaft in the axial direction; a shift actuator that rotates the shift select shaft about an axis; and an oil pressure device including an oil pump that supplies working oil to the select actuator and the shift actuator, a motor, and an accumulator.

The shift unit further includes a bottom plate that is integrally attached to a transmission case of the automatic transmission after the selection actuator, the shift actuator, and the hydraulic device are integrated, and the bottom plate is fastened to the transmission case at a plurality of fastening portions by bolts.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2016-38069

Disclosure of Invention

Problems to be solved by the invention

In such a conventional automatic transmission, since the base plate is fastened to the transmission case by bolts at a plurality of fastening points, when the fastening points are enlarged in order to firmly fasten the base plate to the transmission case, a large modification of the transmission case is required. This may deteriorate productivity of the automatic transmission, and there is still room for improvement.

The present invention has been made in view of the above-described problems, and an object thereof is to provide an automatic transmission in which a transmission unit can be stably mounted to a transmission case without significantly modifying an existing transmission case, and productivity can be improved.

Means for solving the problems

An automatic transmission of the present invention includes: a transmission housing; a shift case fastened to the transmission case and supporting a shift select shaft extending from an inside of the transmission case to an outside of the transmission case; and a speed change unit provided outside the transmission case and configured to change a speed by automatically operating the shift select shaft, the speed change unit including: an actuator unit that moves the shift select shaft in the axial direction and rotates the shift select shaft around an axis; a drive device that drives the actuator unit; and a bottom plate fastened to the transmission case and connecting the actuator unit and the drive device, wherein the automatic transmission is provided with a plurality of 1 st fastened portions in the transmission case, and a plurality of 2 nd fastened portions in the bottom plate, and the shift box is provided with: a plurality of 1 st fastening portions fastened to the 1 st fastened portions; and a 2 nd fastened portion, the 2 nd fastened portion being fastened to the 2 nd fastened portion, at least half or more of the 2 nd fastened portion being separated from the transmission case.

Effects of the invention

Thus, according to the present invention, the transmission unit can be stably mounted to the transmission case without greatly modifying the existing transmission case, and productivity of the automatic transmission can be improved.

Drawings

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 right side view of an automatic transmission of an embodiment of the present invention.

Fig. 4 is an internal structural view of the automatic transmission in a state in which a transmission case is removed in the automatic transmission according to the embodiment of the present invention.

Fig. 5 is a plan view of the transmission case in a state in which the transmission unit and the shift box are removed in the automatic transmission according to the embodiment of the invention.

Fig. 6 is a front view of a shift box and a shift select shaft of an automatic transmission according to an embodiment of the present invention.

Fig. 7 is a perspective view of a base plate mounted to an automatic transmission of an embodiment of the present invention.

Fig. 8 is a diagram showing the configuration of the hydraulic pressure generating device and the shift actuator of the automatic transmission according to the embodiment of the present invention and the flow direction of oil.

Fig. 9 is a plan view of a shift box and a shift select shaft of an automatic transmission according to an embodiment of the present invention.

Fig. 10 is a bottom view of an automatic transmission shift case and a shift select shaft according to an embodiment of the present invention.

Fig. 11 is a left side view of the automatic transmission with the transmission case, the shift select shaft mounted to the shift box, and the transmission unit exploded in the automatic transmission according to the embodiment of the invention.

Fig. 12 is a plan view of the automatic transmission with the transmission case and the base plate exploded in the automatic transmission according to the embodiment of the present invention.

Description of the reference numerals

1: an automatic transmission; 2: a transmission housing; 4a, 4b, 4c, 4d, 4 e: a threaded hole (1 st fastened part); 5: a gear shifting box; 5A, 5B, 5C, 5D, 5E: a boss (1 st fastening part); 5F, 5G, 5H, 5I: a boss portion (2 nd fastened portion); 5J: a joint portion; 5S, 5T: a protruding portion; 5f, 5g, 5h, 5 i: threaded holes (fastening holes); 19A, 19B, 19C, 19D, 19E: a bolt (1 st fastening portion); 19F, 19G, 19H, 19I: bolts (2 nd fastening portion, fastener); 30: a speed change unit; 32: a hydraulic pressure generating device (a drive device, a transmission unit); 33: a shift actuator (actuator unit, shift unit); 35: a base plate (speed change unit); 35F, 35G, 35H, 35I: a boss (2 nd fastening portion); 35f, 35g, 35h, 35 i: bolt holes (insertion holes); 36: a liquid storage tank (drive device); 36 a: a recess; 37: an electric motor (drive device, oil supply unit); 38: an oil pump (drive device, oil supply unit); 39: an accumulator (drive device, oil supply unit).

Detailed Description

An automatic transmission according to an embodiment of the present invention includes: a transmission housing; a shift case fastened to the transmission case, supporting a shift select shaft extending from an inside of the transmission case to an outside of the transmission case; and a transmission unit provided outside the transmission case and configured to shift gears by automatically operating the shift select shaft, the transmission unit including: an actuator portion that moves the shift select shaft in the axial direction and rotates about an axis; a drive device that drives the actuator section; and a base plate fastened to the transmission case and coupling the actuator unit and the drive device, wherein the automatic transmission is provided with a plurality of 1 st fastened portions in the transmission case and a plurality of 2 nd fastened portions in the base plate, and the shift box is provided with: a plurality of 1 st fastening portions fastened to the 1 st fastened portions; and a 2 nd fastened portion, the 2 nd fastened portion being fastened to the 2 nd fastened portion, at least half or more of the 2 nd fastened portion being separated from the transmission case.

Thus, the transmission unit can be stably mounted to the transmission case without greatly modifying the existing transmission case, and productivity of the automatic transmission can be improved.

[ examples ]

Hereinafter, an embodiment of an automatic transmission according to the present invention will be described with reference to the drawings.

Fig. 1 to 12 are diagrams showing an automatic transmission according to an embodiment of the present invention. In fig. 1 to 12, the up-down, left-right direction indicates a direction as viewed from a driver riding in a vehicle.

First, the configuration is explained.

In fig. 1 to 3, an automatic transmission 1 including an AMT, for example, is mounted in an engine room, not shown, of a vehicle. In fig. 1 and 2, an 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.

A clutch 51 (see fig. 2) for starting is housed in the clutch housing 3. In fig. 4, the transmission case 4 houses an input shaft 6, a 1 st intermediate shaft 7, a 2 nd intermediate shaft 8, and a differential device 9. The input shaft 6, the 1 st intermediate shaft 7, and the 2 nd intermediate shaft 8 are disposed so that their axial directions are parallel to each other.

One end of the input shaft 6 protrudes from the transmission case 4 toward the clutch housing 3, and power is transmitted from the internal combustion engine 50 (see fig. 2) to the input shaft 6 through the clutch 51. The input shaft 6 is provided with a speed-change input gear 6A, and the input gear 6A is provided separately in the axial direction of the input shaft 6 by the number corresponding to the speed change stage.

The 1 st countershaft 7 and the 2 nd countershaft 8 are provided with a 1 st countershaft gear 7A and a 2 nd countershaft gear 8A for speed change, respectively, and the 1 st countershaft gear 7A and the 2 nd countershaft gear 8A mesh with the input gear 6A.

Final drive gears

7B and 8B (shown by broken lines in fig. 3) are provided on the 1 st countershaft 7 and the 2 nd countershaft 8, respectively, and the

final drive gears

7B and 8B mesh with a final driven gear 9A of the differential device 9.

The differential device 9 includes: a tip driven gear 9A; a differential case 9B having a tip driven gear 9A mounted on an outer peripheral portion thereof; and a differential gear, not shown, housed in the differential case 9B.

An opening 4A (see fig. 5) is formed in an upper wall of the transmission case 4, and the transmission case 4 accommodates the shift select shaft 10 through the opening 4A. The shift select shaft 10 has a vertical axis orthogonal to the axis of the input shaft 6, and extends from the inside of the transmission case 4 to the outside of the transmission case 4 (see fig. 6).

A shift case 5 is fastened to an upper wall of the transmission case 4, and a shift select shaft 10 is attached to the shift case 5 so as to be movable in the axial direction thereof and rotatable about the axis.

An annular joint portion 4B (see fig. 5) is formed on an upper wall of the transmission case 4. An annular engaging portion 5J (see fig. 10) is formed on the lower surface of the shift case 5, and the engaging portion 5J engages with the engaging portion 4B. The joint portion 5J of the present embodiment has a plate thickness in the vertical direction, and constitutes the joint portion of the present invention.

The 1 st countershaft 7, the 2 nd countershaft 8, and the final driven gear 9A are disposed on the opposite side of the shift select shaft 10 with respect to the input shaft 6.

The shift select shaft 10 is provided with

inner levers

10A and 10B (see fig. 11) spaced apart from each other in the vertical direction. In fig. 4, the inner lever 10A is selectively engageable with the

shift gates

12A and 12B, and the inner lever 10B is selectively engageable with the

shift gates

12C and 12D.

The shift tabs 12A to 12D are coupled to shift shafts 13A to 13D, respectively. The shift shafts 13A to 13D are attached to the transmission case 4 and are movable in the axial direction of the input shaft 6.

Shift forks 14A to 14D are fixed to the shift shafts 13A to 13D, and the shift forks 14A to 14D are coupled to engagement clutches, not shown, respectively. The engagement clutch is provided on the axis of the 1 st intermediate shaft 7 and the 2 nd intermediate shaft 8 and is movable in the axial direction of the 1 st intermediate shaft 7 and the 2 nd intermediate shaft 8.

In the automatic transmission 1 of the present embodiment, the selection operation is performed when the shift select shaft 10 moves in the vertical direction corresponding to the axial direction, and the shift operation is performed when the shift select shaft 10 rotates around the axial line thereof at the predetermined shift speed selection position.

Specifically, when the shift select shaft 10 is moved in the vertical direction and the

inner levers

10A and 10B are fitted to any one of the shift pieces 12A to 12D in a predetermined shift stage, and the shift select shaft 10 is rotated, any one of the shift shafts 13A to 13D is moved in the axial direction of the input shaft 6.

At this time, any one of the shift forks 14A to 14D moves the engagement clutch in the axial direction of the 1 st countershaft 7 or the 2 nd countershaft 8, and couples the 1 st countershaft gear 7A or the 2 nd countershaft gear 8A to the 1 st countershaft 7 or the 2 nd countershaft 8.

Thus, a predetermined shift speed is established between the input gear 6A meshing with the 1 st counter gear 7A or the 2 nd counter gear 8A coupled to the 1 st counter shaft 7 or the 2 nd counter shaft 8.

When the predetermined shift speed is established, the power of the internal combustion engine 50 is transmitted from the input shaft 6 to the 1 st countershaft 7 or the 2 nd countershaft 8 through the 1 st countershaft gear 7A or the 2 nd countershaft gear 8A.

At this time, after power is transmitted from the 1 st intermediate shaft 7 or the 2 nd intermediate shaft 8 to the final driven gear 9A through the final drive gears 7B, 8B, power is transmitted from the differential gear built in the differential case 9B to the left and right drive wheels, not shown, through the left and right drive shafts, not shown. Thereby, the left and right drive wheels rotate differentially.

On the other hand, the internal combustion engine 50 includes an unillustrated crankshaft and an unillustrated flywheel provided on the crankshaft. The clutch 51 includes a friction plate, not shown, provided at an end portion of the input shaft 6.

The clutch 51 transmits power from the crankshaft to the input shaft 6 by bringing a friction plate into contact with a flywheel, and blocks the power transmitted from the crankshaft to the input shaft 6 by separating the friction plate from the flywheel.

In fig. 1, a clutch release member 20 is housed 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 provided on the input shaft 6.

The hydraulic oil is introduced into the separation cylinder 22 through a hydraulic pipe 23. The release bearing 21 is operated by the hydraulic pressure introduced into the release cylinder 22, and the friction plate of the clutch 51 is brought into contact with or separated from the flywheel.

Thereby, the transmission of power from the internal combustion engine 50 to the input shaft 6 or the transmission of power is blocked.

A hydraulic pressure generator 32, a shift actuator 33, and a control device 34 are provided on an upper portion of the transmission case 2, which is an outer side of the transmission case 2. The oil pressure generating device 32, the shift actuator 33, and the control device 34 are mounted to a base plate 35, and the base plate 35 is mounted to the shift box 5.

The hydraulic pressure generator 32 includes a reservoir 36, a motor 37, an oil pump 38, and an accumulator 39. The reservoir tank 36 stores therein working oil. The oil pump 38 is driven by the motor 37, and supplies the working oil stored in the reservoir tank 36 to the accumulator 39 through an oil passage, not shown, formed in the bottom plate 35.

The accumulator 39 accumulates the pressure of the hydraulic oil and supplies the high-pressure hydraulic pressure to the shift actuator 33 through an oil passage, not shown, formed in the base plate 35.

In fig. 7, the bottom plate 35 is formed in a plate shape extending in the horizontal direction. The base plate 35 is provided with an accumulator mounting portion 35A to which the accumulator 39 is mounted and a motor mounting portion 35B to which the motor 37 is mounted. The bottom plate 35 is provided with a communication hole 35C, and the communication hole 35C constitutes an oil passage for communicating the reservoir 36 with the oil pump 38.

A shift actuator mounting portion 35E to which the shift actuator 33 is mounted is formed on the bottom plate 35, and an opening portion 35E is formed in the shift actuator mounting portion 35E. The shift select shaft 10 is inserted through the opening 35e, and the upper portion of the shift select shaft 10 protrudes upward from the upper surface of the bottom plate 35 through the opening 35 e.

In fig. 6, an outer lever 16 and a coil spring 17 are attached to an upper portion of the shift select shaft 10. The coil spring 17 biases the shift select shaft 10 upward in the axial direction of the shift select shaft 10.

In fig. 8, the shift actuator 33 has a clutch operation solenoid valve 40, a select operation solenoid valve 41, a shift operation solenoid valve 42, a select actuator 43, and a shift actuator 44. The shift actuator 33 of the present embodiment constitutes an actuator portion of the present invention.

In fig. 7, a hydraulic oil supply unit 35D is formed in the bottom plate 35, and an end of the hydraulic pipe 23 is attached to the hydraulic oil supply unit 35D. An oil passage 35D is formed in the hydraulic oil supply portion 35D, and the oil passage 35D communicates with the accumulator 39 through an oil passage, not shown, formed in the bottom plate 35. Thereby, the high-pressure hydraulic pressure of the accumulator 39 is supplied to the separation cylinder 22 through the oil passage 35D of the hydraulic oil supply unit 35D and the hydraulic pipe 23.

The clutch operation solenoid valve 40 supplies the high-pressure hydraulic pressure generated by the accumulator 39 from the oil passage 35D of the hydraulic oil supply unit 35D to the release cylinder 22 through the hydraulic pipe 23, and operates the clutch 51.

The selection operation solenoid valve 41 adjusts the high-pressure oil pressure generated by the accumulator 39 and supplies the adjusted high-pressure oil pressure to the selection actuator 43, and the shift operation solenoid valve 42 adjusts the high-pressure oil pressure generated by the accumulator 39 and supplies the adjusted high-pressure oil pressure to the shift actuator 44.

The select actuator 43 presses the shift select shaft 10 against the biasing force of the coil spring 17 based on the oil pressure supplied from the select operation solenoid 41, and operates the shift select shaft 10 in one of the select directions. When the pressing force of the outer lever 16 is released, the shift select shaft 10 is urged by the coil spring 17 to move in the other select direction.

Thus, the shift select shaft 10 is moved in the select direction by the select actuator 43 and the coil spring 17. The coil spring 17 urges the shift select shaft 10 to a position where it moves maximally upward.

When the shift select shaft 10 is at this position, an arbitrary shift stage (or neutral stage) is established, and when the shift select shaft 10 is moved downward against the biasing force of the coil spring 17 from the position where the arbitrary shift stage is established, the other shift stage is established.

The shift actuator 44 presses the shift lever of the shift select shaft 10 based on the oil pressure supplied from the shift operation solenoid valve 42 to operate the shift select shaft 10 in the shift direction.

The control device 34 is constituted by a personal computer including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The control device 34 determines the shift point based on, 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 a vehicle speed, detection information from an accelerator sensor that detects a depression amount of an accelerator pedal, and the like.

When determining the shift point, the control device 34 operates the clutch operation solenoid 40 to supply the hydraulic pressure to the release cylinder 22. When the hydraulic pressure is supplied to the release cylinder 22, the release bearing 21 separates the friction plate of the clutch 51 from the flywheel, thereby blocking the power transmitted from the crankshaft to the input shaft 6.

When the supply of the hydraulic pressure to the release cylinder 22 is stopped, the release bearing 21 brings the friction plate of the clutch 51 into contact with the flywheel, whereby power is transmitted from the crankshaft to the input shaft 6.

When the clutch 51 is disengaged, the control device 34 controls the select operation solenoid valve 41 and the shift operation solenoid valve 42 to drive the shift actuator 44 and the select actuator 43, thereby operating the shift select shaft 10 in the axial direction and around the axis to perform a shift.

In fig. 1, a clutch stroke sensor 24 is provided on the input shaft 6, and the clutch stroke sensor 24 is connected to a control device 34 through a wire 24 a. The clutch stroke sensor 24 detects the movement position of the release cylinder 22 and outputs the detection information to the control device 34. The control device 34 determines the state of the clutch 51 (for example, the clutch 51 is in the partially engaged state) based on the detection information of the clutch stroke sensor 24.

The oil pressure generating device 32 of the present embodiment including the reservoir tank 36, the motor 37, the oil pump 38, and the accumulator 39 constitutes the driving device of the present invention, and the motor 37, the oil pump 38, and the accumulator 39 constitute the oil supply portion of the present invention.

The clutch operating device 31, the hydraulic pressure generating device 32, the shift actuator 33, the control device 34, and the base plate 35 constitute a shift unit 30.

In fig. 6, a guide plate 18 is provided in the shift box 5, and a guide groove 18A along the shape of the shift pattern is formed in the guide plate 18. The front end of a guide pin 10C provided on the shift select shaft 10 is inserted into the guide groove 18A.

When the shift select shaft 10 is shifted to each shift speed, the guide pin 10C abuts against the wall surface of the guide groove 18A corresponding to each shift speed. This restricts the amount of movement of shift select shaft 10 in the select direction and the shift direction, and prevents shift select shaft 10 from rattling in the select direction and the shift direction.

In fig. 5, screw

holes

4a, 4B, 4c, 4d, 4e are provided in the joint portion 4B of the transmission case 4, and the screw holes 4a to 4e are spaced at fixed intervals in the circumferential direction of the joint portion 4B. The joint portion 4B is formed with 2

pin holes

4j, 4k into which unillustrated positioning pins are fitted, and the

pin holes

4j, 4k face each other in the vehicle width direction.

In fig. 9, the shift case 5 is provided with 5

bosses

5A, 5B, 5C, 5D, 5E, and bolt

holes

5A, 5B, 5C, 5D, 5E are formed in the bosses 5A to 5E, respectively (see fig. 10).

In fig. 10, the bolt holes 5a to 5e are separated at fixed intervals in the circumferential direction of the joint portion 5J. The joint portion 5J is formed with 2

pin holes

5J, 5k into which the positioning pins are fitted, and the pin holes 5J, 5k face each other in the vehicle width direction.

The shift case 5 is positioned to the transmission case 4 by connecting

pin holes

4j, 4k, 5j, 5k by positioning pins so that the screw holes 4a to 4e are aligned with the bolt holes 5a to 5e, respectively.

The shift case 5 is fastened to the transmission case 4 by fitting the

bolts

19A, 19B, 19C, 19D, 19E into the threaded holes 4a to 4E through the bolt holes 5a to 5E in a state in which the threaded holes 4a to 4E are aligned with the bolt holes 5a to 5E, respectively (refer to fig. 12).

In fig. 7, 4

bosses

35F, 35G, 35H, 35I are provided on the bottom plate 35, and bolt

holes

35F, 35G, 35H, 35I are formed in the bosses 35F to 35I, respectively.

In fig. 9 and 10, the shift case 5 is formed with projecting

portions

5S and 5T. The projecting

portions

5S, 5T project beyond the engaging portion 5J, being separated from the transmission case 4. That is, the protruding

portions

5S, 5T are provided in a separate member from the transmission case 4. Here, the other than the engaging portion 5J means the opposite side of the shift select shaft 10 with respect to the engaging portion 5J.

The projecting

portions

5S, 5T are provided with

bosses

5F, 5G, 5H, and screw

holes

5F, 5G, 5H are formed in the bosses 5F to 5H, respectively. Thereby, the bosses 5F to 5H are separated from the transmission case 4.

A boss portion 5I is provided on the upper surface of the shift case 5, and a screw hole 5I is formed in the boss portion 5I. The boss portion 5I is provided on the shift select shaft 10 side with respect to the engagement portion 5J. The boss 5I is separated from the transmission case 4.

The

bolts

19F, 19G, 19H, 19I are fitted with the threaded holes 5F to 5I through the bolt holes 35F to 35I in a state where the threaded holes 5F to 5I are aligned with the bolt holes 35F to 35I, whereby the bottom plate 35 is fastened only to the shift box 5 (refer to fig. 2).

In fig. 9, a boss 5H is formed with a pin hole 5m into which a positioning pin, not shown, is fitted. In fig. 6, a fitting portion 5M is formed on the upper surface of the shift case 5, and the fitting portion 5M surrounds the shift select shaft 10 and protrudes upward from the upper surface of the shift case 5.

A pin hole, not shown, into which a fitting portion, not shown, and a positioning pin are fitted is formed in the lower surface of the bottom plate 35. When the fitting portion 5M of the shift case 5 is fitted with the fitting portion of the bottom plate 35 and the pin hole 5M of the shift case 5 are coupled by the positioning pin, the bolt holes 35f to 35i are aligned with the screw holes 5f to 5i, and the bottom plate 35 is positioned to the shift case 5.

In fig. 2, a recess 36a is formed in the reservoir tank 36, and a bolt 19I for fastening the bottom plate 35 to the shift case 5 is housed in the recess 36 a.

The bosses 5A to 5E and the bolts 19A to 19E of the present embodiment constitute the 1 st fastening portion of the present invention, and the screw holes 4a to 4E constitute the 1 st fastened portion of the present invention. The bosses 35F to 35I and the bolts 19F to 19I constitute a 2 nd fastening portion of the invention, and the screw holes 5F to 5I and the bosses 5F to 5I constitute a 2 nd fastened portion of the invention.

The bolts 19F to 19I constitute the fastener of the present invention, and the bolt holes 35F to 35I constitute the insertion holes of the present invention. The screw holes 5f to 5i constitute fastening holes of the present invention. Further, the number of the screw holes 4a to 4E, the bosses 5A to 5E, the bosses 5F to 5I, and the bosses 35F to 35I is not limited to 4 or 5.

In fig. 3, when the automatic transmission 1 is viewed from the axial direction of the input shaft 6, a bulging portion 3A is formed in the clutch housing 3, and the bulging portion 3A bulges outward beyond a vertical wall 4C extending in the vertical direction of the transmission case 4.

An extending portion 35p is formed at an end portion of the bottom plate 35 in the extending direction, and the extending portion 35p extends outward from the vertical wall 4C of the transmission case 4 and to the side 3A of the bulging portion 3A.

In the hydraulic pressure generating device 32, a reservoir tank 36 and a motor 37 are provided on the upper surface side of the extension portion 35p, and an oil pump 38 and an accumulator 39 are provided on the lower surface side of the extension portion 35 p.

Next, the operation will be described.

As shown in fig. 11, in a state before the transmission unit 30 is mounted to the transmission case 2, the gear box 4, the shift select shaft 10 integrated with the shift box 5, and the transmission unit 30 are independent.

When the shift select shaft 10 is attached to the transmission case 4 from this state, the shift select shaft 10 is accommodated in the transmission case 4 through the opening 4A of the transmission case 4.

Next, the

pin holes

4j, 4k and the

pin holes

5j, 5k are coupled by positioning pins, so that the screw holes 4a to 4e and the bolt holes 5a to 5e are aligned, respectively.

Next, the bolts 19A to 19E are inserted through the respective bolt holes 5A to 5E, and the bolts 19A to 19E are fastened to the threaded holes 4a to 4E, respectively, so that the bosses 5A to 5E are fastened to the threaded holes 4a to 4E by the bolts 19A to 19E. Thereby, the gear box 5 is fastened to the gear box 4. This state is shown in fig. 12.

Next, the upper portion of the shift select shaft 10 is inserted through the opening 35e of the bottom plate 35, and the bottom plate 35 is placed on the shift case 5.

At this time, when the fitting portion 5M of the shift case 5 is fitted with the fitting portion of the bottom plate 35 and the pin hole 5M of the shift case 5 are coupled by the positioning pin, the bolt holes 35f to 35i are aligned with the screw holes 5f to 5i and the bottom plate 35 is positioned to the shift case 5.

In fig. 12, the aligned bolt holes 35f to 35i are connected with the threaded holes 5f to 5i by wires. After the bottom plate 35 is positioned to the shift box 5, the bolts 19F to 19I are inserted through the bolt holes 35F to 35I, respectively, and the bolts 19F to 19I are fastened to the threaded holes 5F to 5I.

Thereby, the bosses 35F to 35I are fastened to the bosses 5F to 5I by the bolts 19F to 19I, and the bottom plate 35 is fastened to the shift case 5. As a result, the transmission unit 30 is mounted to the shift case 5.

The automatic transmission 1 of the present embodiment includes a transmission unit 30, and the transmission unit 30 is provided outside the transmission case 4 and shifts gears by automatically operating the shift select shaft 10.

The shift unit 30 includes: a shift actuator 33 that moves the shift select shaft 10 in the axial direction and rotates around the axis; a hydraulic pressure generator 32 that drives a shift actuator 33; and a base plate 35 fastened to the transmission case 4, linking the shift actuator 33 and the oil pressure generating device 32.

Screw holes 4a to 4e are provided in the transmission case 4, bosses 35F to 35I are provided in the bottom plate 35, and bolt holes 35F to 35I are formed in the bosses 35F to 35I.

The gear shift box 5 is provided with: bosses 5A to 5E formed with bolt holes 5A to 5E for inserting bolts 19A to 19E, fastened to the threaded holes 4a to 4E by the bolts 19A to 19E; and bosses 5F to 5I to which the bosses 35F to 35I are fastened by bolts 19F to 19I, the bosses 5F to 5I being separated from the transmission case 4.

Thereby, the bottom plate 35 can be firmly fastened to the shift case 5 by the bolts 19F to 19I, and the transmission unit 30 can be mounted to the transmission case 4 in a stable state.

In addition, the bosses 5F to 5I that fasten the bottom plate 35 to more than half of the shift case 5 are separated from the transmission case 4, so the bottom plate 35 can be mounted to the transmission case 2 without greatly modifying the transmission case 2. As a result, the productivity of the automatic transmission 1 can be improved.

In addition, according to the automatic transmission 1 of the present embodiment, the bosses 5F to 5I are formed only in the shift case 5, and the bottom plate 35 is fastened only to the shift case 5. This can reduce the modification of the transmission case 2 that is the base of the automatic transmission 1, and thus, for example, the transmission case of a manual transmission can be easily converted to the transmission case of the automatic transmission. As a result, the productivity of the automatic transmission 1 can be improved more effectively.

In addition, according to the automatic transmission 1 of the present embodiment, the shift box 5 includes: an annular engaging portion 5J provided with projections 5A to 5E to engage with the transmission case 4; and projecting

portions

5S, 5T projecting beyond the engaging portion 5J, the projecting

portions

5S, 5T being provided with projections 5F to 5H.

Thereby, the transmission unit 30 can be attached to the transmission case 4 in a more stable state.

In the present embodiment, the boss portion 5I is provided on the shift select shaft 10 side with respect to the engagement portion 5J and is not disposed in the projecting portion, but may be disposed in the projecting portion.

In this way, the bosses 5F to 5I can be separated from the transmission case 4, the modified portion of the transmission case 2 that is the base of the automatic transmission 1 can be more effectively reduced, and the productivity of the automatic transmission 1 can be more effectively improved.

In addition, according to the automatic transmission 1 of the present embodiment, the reservoir tank 36 has the recess 36a, and the recess 36a receives the bolt 19I for fastening the bottom plate 35 to the shift case 5. Thereby, the bolt 19I and the bosses 5I, 35I can be provided at the optimum positions for fastening the shift unit 30 to the transmission case 4 without affecting the position of the reservoir 36.

Note that, the Automatic Transmission 1 of the present embodiment uses an AMT as an example, but may be an AT (Automatic Transmission) as an Automatic Transmission.

Although embodiments of the present 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 claims.

Claims

1. An automatic transmission is provided with:

a transmission housing;

a shift case fastened to the transmission case and supporting a shift select shaft extending from an inside of the transmission case to an outside of the transmission case; and

a transmission unit provided outside the transmission case and configured to shift gears by automatically operating the shift select shaft,

the transmission unit includes: an actuator unit that moves the shift select shaft in the axial direction and rotates the shift select shaft around an axis; a drive device that drives the actuator unit; and a base plate fastened to the transmission case and connecting the actuator unit and the drive device, wherein the automatic transmission is characterized in that,

the transmission case is provided with a plurality of 1 st fastened portions,

the bottom plate is provided with a plurality of No. 2 fastening parts,

the gear shifting box is provided with: a plurality of 1 st fastening portions fastened to the 1 st fastened portions; and a 2 nd fastened portion, the 2 nd fastened portion being fastened to the 2 nd fastened portion,

at least half or more of the 2 nd fastened parts are separated from the transmission case.

2. The automatic transmission of claim 1,

the 2 nd fastened portions are all separated from the transmission case.

3. The automatic transmission of claim 1,

the 2 nd fastened portion is formed only in the shift case, and the bottom plate is fastened only to the shift case.

4. The automatic transmission of claim 2,

5. The automatic transmission according to any one of claims 1 to 4,

the gear shifting box comprises: an engaging portion which is annular, is provided with the 1 st fastening portion, and is engaged with the transmission case; and a protruding portion protruding out of the engaging portion,

at least 1 of the 2 nd fastened portions is provided in the protruding portion.

6. The automatic transmission according to any one of claims 1 to 4,

the 2 nd fastening part includes a fastening member and an insertion hole for inserting the fastening member,

the 2 nd fastened part includes a fastening hole, the fastening part is fastened to the fastening hole,

the above-mentioned drive device includes: a liquid storage tank which stores oil; and an oil supply unit for supplying the oil stored in the reservoir tank to the actuator unit,

the liquid storage tank is provided with a concave part for accommodating the fastener.