JP7087621B2 - Automatic transmission - Google Patents

Description

The present invention relates to an automatic transmission.

Conventionally, in an automatic transmission mounted on a vehicle such as an automobile, a transmission case that rotatably supports an input shaft or the like, and a clutch, a clutch lever, and a shift-and-select shaft provided in the transmission case are used. , An automatic transmission including a shift unit for operating a clutch lever and a shift-and-select shaft (see Patent Document 1). In the automatic transmission described in Patent Document 1, the shift unit has a base plate on which a housing having a speed change actuator and a clutch actuator is attached, and the base plate is fixed to the outer wall of the transmission case.

Japanese Unexamined Patent Publication No. 2016-37257

Here, the outer wall of the transmission case is required to have strength for fixing the base plate of the shift unit. In addition, if the inside of the fixed part where the base plate is fixed in the transmission case is a wide cavity, the transmission case may vibrate due to the load acting from the base plate to the fixed part, or vibration or noise generated in the transmission case. May increase.

In the automatic transmission described in Patent Document 1, there is room for further study regarding suppressing the generation of vibration and noise in the transmission case.

The present invention has been made by paying attention to the above circumstances, and can reduce vibration and noise generated in a transmission case in an automatic transmission in which a shift unit is attached to an outer wall of the transmission case. The purpose is to provide an automatic transmission that can be used.

In order to achieve the above object, the present invention comprises a friction clutch, a transmission having an input shaft to which power is transmitted from the friction clutch, and a shift-and-select shaft for shifting, and the friction clutch and the transmission. A transmission case having a peripheral wall surrounding from the outer peripheral side, and a partition wall for partitioning the inside of the peripheral wall into a clutch chamber in which the friction clutch is housed and a transmission chamber in which the transmission is housed, and an outer surface of the peripheral wall. An automatic transmission having a base plate fixed to the base plate, a clutch actuator for operating the friction clutch, and a shift actuator for operating the shift and select shaft, and a shift unit attached to the base plate. The shift and select shaft and the base plate are arranged at positions adjacent to the partition wall in the direction along the input axis, and the base plate is arranged so as to straddle the partition wall in the direction along the input shaft. A plurality of fixing portions are fastened to the outer surface of the clutch chamber and the outer surface of the transmission chamber on the peripheral wall, and the plurality of fixing portions are arranged on both sides of the partition wall in a direction along the input shaft. The partition and the shift-and-select shaft are characterized in that they are arranged between the plurality of fixing portions of the base plate in a direction along the input shaft .

As described above, according to the present invention described above, in an automatic transmission in which a shift unit is attached to an outer wall of a transmission case, vibration and noise generated in the transmission case can be reduced.

FIG. 1 is a plan view of an automatic transmission according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. FIG. 3 is a right side view of the automatic transmission according to the embodiment of the present invention as viewed from the right side of the vehicle. FIG. 4 is an enlarged side view showing the right side surface of the front case of the automatic transmission according to the embodiment of the present invention in a state where the shift unit is attached. FIG. 5 is a front view of the front case of the automatic transmission according to the embodiment of the present invention as viewed from the front. FIG. 6 is a rear view of the front case of the automatic transmission according to the embodiment of the present invention as viewed from the rear. FIG. 7 is an enlarged side view showing the right side surface of the front case of the automatic transmission according to the embodiment of the present invention in a state where only the base plate of the shift unit is attached. FIG. 8 is an enlarged side view showing the right side surface of the front case of the automatic transmission according to the embodiment of the present invention in a state where the shift unit is not attached. FIG. 9 is a cross-sectional view taken along the line in the IX-IX direction of FIG. FIG. 10 is a cross-sectional view taken along the line XX of FIG. FIG. 11 is a cross-sectional view taken along the line in the XI-XI direction of FIG. FIG. 12 is a bottom view of the front case of the automatic transmission according to the embodiment of the present invention as viewed from below with the oil pan removed.

The automatic transmission according to the embodiment of the present invention includes a friction clutch, a transmission having an input shaft to which power is transmitted from the friction clutch, and a shift-and-select shaft for shifting, and a friction clutch and a transmission. A transmission case having a peripheral wall surrounding from the outer peripheral side and a partition wall for partitioning the inside of the peripheral wall into a clutch chamber in which a friction clutch is housed and a transmission chamber in which a transmission is housed, and fixed to the outer surface of the peripheral wall. An automatic transmission having a clutch actuator that has a base plate and operates a friction clutch, and a shift actuator that operates a shift and select shaft and has a shift unit attached to the base plate. The base plate is arranged at a position adjacent to the partition wall in the direction along the input shaft, and the base plate is fixed to the outer surface of the clutch chamber and the outer surface of the transmission chamber on the peripheral wall. Thereby, the automatic transmission according to the embodiment of the present invention can reduce the vibration and noise generated in the transmission case.

Hereinafter, the automatic transmission according to an embodiment of the present invention will be described with reference to the drawings. 1 to 12 are views showing an automatic transmission according to an embodiment of the present invention. In FIGS. 1 to 12, when the direction in which the vehicle travels is the front and the direction in which the vehicle moves backward is the rear, the width direction of the vehicle is the left-right direction and the height direction of the vehicle is the up-down direction. Further, the width direction of the vehicle is also referred to as the vehicle width direction.

First, the configuration will be described. In FIGS. 1 and 3, an automatic transmission 2 is mounted on the vehicle 1, and the automatic transmission 2 is fixed to an engine 3 as a driving force source and an internal combustion engine, and is attached to a floor panel 1A of the vehicle 1. It is installed vertically below. That is, the vehicle 1 of this embodiment is a rear-wheel drive vehicle.

The automatic transmission 2 includes a transmission case 4, and the transmission case 4 includes a torque converter housing (hereinafter, simply referred to as a torque converter housing) 5, a front case 6, a rear case 7, and an extension case 8. There is. The front end of the transmission case 4 is connected to the engine 3 by a bolt (not shown). Of the transmission cases 4, the front case 6, the rear case 7, and the extension case 8 excluding the torque converter housing 5 constitute the transmission case main body 40. That is, the transmission case 4 includes a torque converter housing 5 and a transmission case main body 40.

The automatic transmission 2 includes a shift unit 100, and the shift unit 100 drives the automatic transmission 2 to perform a shift operation and a clutch operation. Here, the shift operation means an operation of switching the shift stage of the automatic transmission 2, and the clutch operation means engaging (connecting) or releasing (disconnecting) the friction clutch 17 (see FIG. 2) of the automatic transmission 2. The operation to be performed.

In FIG. 2, the torque converter 10 is housed in the torque converter housing 5. The torque converter 10 includes a front cover 10A connected to a crank shaft (not shown) of the engine 3 and a shell 10B connected to the front cover 10A, and powers the automatic transmission 2 from the engine 3 via oil. Is communicating.

A pump impeller (not shown) is fixed to the inner surface of the shell 10B. Inside the shell 10B, a turbine runner (not shown) is installed facing the pump impeller, and the turbine runner is connected to the turbine shaft 11. A stator (not shown) is installed between the pump impeller and the turbine runner.

When the crank shaft of the engine 3 rotates, the front cover 10A, the shell 10B, and the pump impeller rotate integrally in the torque converter 10. At this time, due to the centrifugal force due to the rotation of the pump impeller, a flow from the pump impeller to the turbine runner is generated in the fluid inside the torque converter 10. The stator converts the flow of fluid from the turbine runner along the direction of rotation of the pump impeller. The torque converter 10 amplifies the power received from the engine 3 by the torque amplification action and outputs it from the turbine shaft 11.

A ring gear 10C is provided on the outer peripheral portion of the shell 10B. The ring gear 110C transmits the rotation of the starter to the engine 3 by engaging the pinions of the starter (not shown) when the engine 3 is started.

The torque converter housing 5 has a peripheral wall 51 that surrounds the torque converter 10 from the outer peripheral side, and a partition wall 55 that is provided inside the peripheral wall 51 and supports the turbine shaft 11 between the torque converter 10 and the friction clutch 17. ..

The partition wall 55 separates the torque converter chamber 81 inside the torque converter housing 5 and the clutch chamber 82 inside the front case 6. The turbine shaft 11 is rotatably supported via a bearing 38A in a bearing portion formed on the partition wall 55.

An oil pump 12 is housed in the torque converter housing 5, and the oil pump 12 is composed of, for example, a trochoid type oil pump. The oil pump 12 includes a pump housing 12A, which is a second pump housing 14 fixed to a partition wall 55 by a bolt (not shown) and a first pump fastened to the second pump housing 14 by a bolt (not shown). It consists of a housing 13. The first pump housing 13 and the second pump housing 14 constitute a housing of the oil pump 12. A pump chamber 15 is formed inside the first pump housing 13 and the second pump housing 14, and an inner rotor and an outer rotor (not shown) are provided in the pump chamber 15. The inner rotor is attached to the shell 10B via the impeller hub and rotates integrally with the shell 10B.

The outer rotor is provided on the outer side in the radial direction of the inner rotor, and rotates with the rotation of the inner rotor. In the trochoid type oil pump 12, the internal teeth formed on the outer rotor and the external teeth formed on the inner rotor come into contact with each other to form an operating chamber (not shown) for accommodating oil between the external teeth and the internal teeth. ing.

When the power of the engine 3 is transmitted to the inner rotor via the front cover 10A, the inner rotor and the outer rotor rotate in one direction in the oil pump 12. At this time, the volume of the working chamber increases and decreases continuously, so that the oil is sucked into the working chamber and the oil is discharged from the working chamber.

A disk-shaped flange portion 11A is formed at the rear end portion of the turbine shaft 11, and the flange portion 11A is formed to have a larger diameter than the front end portion and the central portion of the turbine shaft 11. An annular flywheel 16 is attached to the flange portion 11A. The flywheel 16 is housed in the front case 6.

A friction clutch 17 and a transmission 20 are housed in the front case 6, and the friction clutch 17 faces the flywheel 16 in the axial direction.

The front case 6 includes a peripheral wall 61 that surrounds the friction clutch 17 and the transmission 20 from the outer peripheral side, a clutch chamber 82 in which the friction clutch 17 is housed, and a transmission room 83 in which the transmission 20 is housed inside the peripheral wall 61. It has a partition wall 65 and a partition wall 65.

The rear case 7 has a peripheral wall 71 that surrounds the transmission 20 from the outer peripheral side, and a partition wall 75 that supports the rotation axis of the transmission 20. The partition wall 75 is formed at the rear end of the rear case 7 and seals the internal space of the peripheral wall 71.

The friction clutch 17 is attached in the vicinity of the front end portion 21a in the axial direction of the input shaft 21. The input shaft 21 is housed in the front case 6 and the rear case 7, is rotatably supported by the flange portion 11A via the bearing 38B at the front end portion 21a in the axial direction, and is rotatably supported by the flange portion 11A at the rear end portion 21b in the axial direction. It is rotatably supported. A torque converter 10 is arranged on the axis of the input shaft 21, and a friction clutch 17 is connected to the output side of the torque converter 10.

The output shaft 22 faces the input shaft 21 in the axial direction of the input shaft 21. The output shaft 22 is rotatably supported by the partition wall 75 at the rear end of the rear case 7 and the extension case 8 via bearings 38D and 38E, respectively. The output shaft 22 rotates relative to the input shaft 21.

The friction clutch 17 includes a clutch disc 17A provided so as to be integrally rotatable with the input shaft 21 and movable in the axial direction of the input shaft 21, a pressure plate 17B for pressing the clutch disc 17A against the flywheel 16, and a pressure plate 17B. It is equipped with a diaphragm spring 17C that urges the flywheel 16 side.

The partition wall 65 of the front case 6 is formed with a tubular portion 66 through which the input shaft 21 passes, and the tubular portion 66 rubs from the inner end in the radial direction of the partition wall 65 along the axial direction of the input shaft 21. It extends to the clutch 17 side. That is, the tubular portion 66 is formed so as to project from the partition wall 65 toward the clutch chamber 82. The input shaft 21 is supported on the inner circumference of the tubular portion 66 via a bearing 38C.

A release bearing 18 is provided on the outer peripheral portion of the tubular portion 66, and the release bearing 18 moves in the axial direction of the input shaft 21 to come into contact with and separate from the diaphragm spring 17C in the radial direction.

When the release bearing 18 is moved forward in the axial direction of the input shaft 21 by the release lever 19, it presses the radial inner end portion of the diaphragm spring 17C forward. As a result, the urging of the pressure plate 17B is released, and the clutch disc 17A is separated from the flywheel 16. As a result, the rotation of the crank shaft of the engine 3 is not transmitted to the input shaft 21.

When the release bearing 18 is moved rearward with respect to the axial direction of the input shaft 21 by the release lever 19, it separates from the inner end portion of the diaphragm spring 17C in the system direction. At this time, the diaphragm spring 17C urges the pressure plate 17B to press the clutch disc 17A against the flywheel 16 to transmit the rotation of the crank shaft of the engine 3 to the input shaft 21. In this way, the friction clutch 17 switches the power transmission state between the crank shaft of the engine 3 and the input shaft 21 to the transmission state or the cutoff state. The release lever 19 is connected to the shift unit 100 described above and is operated by the shift unit 100.

A counter shaft 23 is housed in the front case 6 and the rear case 7, and the counter shaft 23 is rotatably supported by the partition walls 65 and 75. The counter shaft 23 extends parallel to the input shaft 21 and the output shaft 22.

The input shaft 21 is provided with a 4-speed input gear 24A, a 3-speed input gear 24B, a 2-speed input gear 24C, a 1-speed input gear 24D, and a reverse input gear 24E from the friction clutch 17 side toward the output shaft 22. ..

The 4th speed input gear 24A, the 3rd speed input gear 24B, the 2nd speed input gear 24C, the 1st speed input gear 24D, and the reverse input gear 24E are rotatably connected to the input shaft 21.

A 5-speed clutch gear 22A is provided at the front end of the output shaft 22, and the 5-speed clutch gear 22A is composed of a dog formed on the outer peripheral portion of the output shaft 22.

The counter shaft 23 is provided with a 4-speed counter gear 26A, a 3-speed counter gear 26B, a 2-speed counter gear 26C, a 1-speed counter gear 26D, and a counter drive gear 26E from the friction clutch 17 side toward the output shaft 22. ..

The 4-speed counter gear 26A, the 3-speed counter gear 26B, the 2-speed counter gear 26C, the 1-speed counter gear 26D, and the counter drive gear 26E are fixed to the counter shaft 23.

The 4th speed counter gear 26A, the 3rd speed counter gear 26B, the 2nd speed counter gear 26C, and the 1st speed counter gear 26D are the 4th speed input gear 24A, the 3rd speed input gear 24B, and the 2nd speed input gear 24C, which form the same gear. It meshes with the 1st speed input gear 24D.

The counter drive gear 26E meshes with the counter driven gear 27, and the counter driven gear 27 is fixed to the output shaft 22 so as to rotate integrally with the output shaft 22.

The front case 6 and the rear case 7 include a synchronization device 28 for 3rd and 4th speeds, a synchronization device 29 for 1st and 2nd speeds, and a synchronization device 30 for reverse and 5th speeds.

The synchronization device 28 for 3rd and 4th speeds is rotatable integrally with the input shaft 21 and is movably provided in the axial direction of the input shaft 21. When the shift and select shaft 33 is operated, the synchronization device 28 for the 3rd and 4th speeds has the input shaft 21 via the shift shaft, the shift yoke and the shift fork for the 3rd and 4th speeds (not shown). Moved in the axial direction.

The 1st / 2nd speed synchronization device 29 is rotatable integrally with the input shaft 21 and is movably provided in the axial direction of the input shaft 21. When the shift and select shaft 33 is operated, the 1st / 2nd speed synchronization device 29 of the input shaft 21 via the 1st / 2nd speed shift shaft, shift yoke and shift fork (not shown). Moved in the axial direction.

The reverse-5-speed synchronization device 30 is rotatable integrally with the input shaft 21 and is movably provided in the axial direction of the input shaft 21. When the shift-and-select shaft 33 is operated, the reverse-5-speed synchronous device 30 has an axial direction of the input shaft 21 via a reverse-5-speed shift shaft, a shift yoke, and a shift fork (not shown). Will be moved to.

The synchronization device 28 for 3rd and 4th speeds moves from the neutral position to the front side in the axial direction of the input shaft 21 to connect the 4th speed input gear 24A to the input shaft 21 to establish a forward 4th speed stage. The power of the input shaft 21 is transmitted to the counter shaft 23 via the 4-speed input gear 24A and the 4-speed counter gear 26A.

The power transmitted to the counter shaft 23 is transmitted from the counter drive gear 26E to the output shaft 22 via the counter driven gear 27. A differential device (not shown), a drive shaft, and a drive rear wheel are connected to the output shaft 22 via a propeller shaft (not shown).

As a result, the power transmitted to the output shaft 22 is transmitted to the differential device via the propeller shaft, then distributed to the left and right drive shafts by the differential device, and is transmitted from the drive shaft to the drive rear wheels. As a result, the vehicle 1 is driven.

The synchronization device 28 for 3rd and 4th speeds connects the 3rd speed input gear 24B to the input shaft 21 by moving from the neutral position to the rear side in the axial direction of the input shaft 21 to establish a forward 3rd speed stage. , The power of the input shaft 21 is transmitted to the counter shaft 23 via the 3rd speed input gear 24B and the 3rd speed counter gear 26B.

The 1st / 2nd speed synchronous device 29 moves from the neutral position to the front side in the axial direction of the input shaft 21 to connect the 2nd speed input gear 24C to the input shaft 21 to establish a forward 2nd speed stage. The power of the input shaft 21 is transmitted to the counter shaft 23 via the second speed input gear 24C and the second speed counter gear 26C.

The 1st / 2nd speed synchronization device 29 moves from the neutral position to the rear side in the axial direction of the input shaft 21 to connect the 1st speed input gear 24D to the input shaft 21 to establish a forward 1st speed stage. , The power of the input shaft 21 is transmitted to the counter shaft 23 via the 1st speed input gear 24D and the 1st speed counter gear 26D.

The reverse-5-speed synchronous device 30 moves from the neutral position to the front side in the axial direction of the input shaft 21 to connect the reverse input gear 24E to the input shaft 21 to establish a reverse stage, and the reverse stage 21 is established. Power is transmitted from the reverse input gear 24E to the counter shaft 23 via the reverse idler gear and the reverse output gear (not shown) and the 1st speed counter gear 26D. At this time, since the counter shaft 23 rotates in the direction opposite to the rotation direction at the time of forward movement, the vehicle 1 is moved backward.

The reverse-5th speed synchronization device 30 moves from the neutral position to the rear side in the axial direction of the input shaft 21 to connect the 5th speed clutch gear 22A to the input shaft 21 to establish a forward 5th speed stage. The power of the input shaft 21 is directly transmitted to the output shaft 22.

A shift case 9 is provided on the upper portion of the front case 6, and a shift and select shaft 33 is provided inside the shift case 9. The shift and select shaft 33 extends in the vehicle width direction orthogonal to the extending direction of the input shaft 21.

The shift-and-select shaft 33 is provided in the shift case 9 so as to be rotatable and axially movable, and is operated by a shift unit 100 connected to an end thereof.

An oil pan 41 is attached to the lower part of the front case 6, and an oil storage chamber 43 for storing oil is formed inside the oil pan 41. Further, a valve body 42 is housed between the oil pan 41 and the lower portion of the front case 6, and the valve body 42 is fixed to the lower portion of the front case 6.

The valve body 42 supplies the oil sucked up from the oil pan 41 by the oil pump 12 to the torque converter 10 through the inside of the torque converter housing 5.

The oil supplied to the torque converter 10 is used as oil for engaging or disengaging a lockup clutch (not shown) of the torque converter 10, or oil flowing from the pump impeller to the turbine runner.

Further, the valve body 42 supplies the oil sucked up from the oil pan 41 by the oil pump 12 to a portion requiring lubrication such as the bearing 38A through the inside of the torque converter housing 5.

In FIGS. 3 and 4, the shift unit 100 is attached to the right side surface of the peripheral wall 61 of the front case 6. The shift unit 100 includes a reserve tank 104 for storing oil, an oil pump 105 for boosting the oil supplied from the reserve tank 104, a motor 106 for driving the oil pump 105, and the pressure of the oil boosted by the oil pump 105. It has an accumulator 107 for accumulating pressure.

Further, the shift unit 100 includes a shift actuator 102 that operates the shift and select shaft 33, a clutch actuator 103 that operates the friction clutch 17, and a control device 108 that controls these shift actuator 102 and the clutch actuator 103. The control device 108 has an oil passage switching valve such as a solenoid valve (not shown), and the shift actuator by switching the oil supply path from the accumulator 107 to the shift actuator 102 and the clutch actuator 103 by the oil passage switching valve. Drives 102 and the clutch actuator 103.

Further, the shift unit 100 has a base plate 101 to which the shift actuator 102, the clutch actuator 103, and the like are attached. The base plate 101 is formed in a rectangular flat plate shape in a side view, and is fixed to the outer surface of the peripheral wall 61. In this embodiment, the base plate 101 is fixed to the right side surface of the peripheral wall 61.

The shift unit 100 has a first fixing portion 101A, a second fixing portion 101B, a third fixing portion 101C, and a fourth fixing portion 101D which are fixed to the outer surface of the peripheral wall 61 by fastening. The first fixing portion 101A is arranged near the upper end portion and the front end portion of the base plate 101, and the fourth fixing portion 101D is arranged near the upper end portion and the rear end portion of the base plate 101. The second fixing portion 101B is arranged near the lower end portion and the front end portion of the base plate 101, and the third fixing portion 101C is arranged near the lower end portion and the rear end portion of the base plate 101.

On the other hand, on the outer surface of the peripheral wall 61, a first fixed portion 61A, a second fixed portion 61B, a third fixed portion 61C, and a fourth fixed portion 61D to which the base plate 101 is fixed by fastening are formed.

The first fixed portion 61A, the second fixed portion 61B, the third fixed portion 61C and the fourth fixed portion 61D are the first fixed portion 101A, the second fixed portion 101B, the third fixed portion 101C and the fourth fixed portion. It is arranged at a position corresponding to each of the portions 101D. Here, "fixing by fastening" means fixing with bolts or fixing with stud bolts and nuts.

In FIG. 10, the first fixed portion 61A and the fourth fixed portion 61D are formed in a boss shape protruding toward the base plate 101. Similarly, the second fixed portion 61B and the third fixed portion 61C are formed in a boss shape protruding toward the base plate 101, as shown in FIGS. 5 and 6.

In FIGS. 7 and 9, the base plate 101 is arranged at a position adjacent to the partition wall 65 in the direction (axial direction) along the input shaft 21.

In FIGS. 7, 8 and 9, the base plate 101 is fixed to the outer surface of the clutch chamber 82 and the outer surface of the transmission chamber 83 on the peripheral wall 61.

In FIG. 9, the shift and select shaft 33 is arranged at a position adjacent to the partition wall 65 in the direction (axial direction) along the input shaft 21.

In FIGS. 5 and 11, in the region where the base plate 101 is arranged in the direction along the input shaft 21, the inner surface of the peripheral wall 61, the partition wall 65, and the tubular portion 66 are connected by ribs 131 and 132. The ribs 131 and 132 extend in the radial direction about the input shaft 21.

In FIGS. 5 and 6, the partition wall 65 has support portions 65B and 65C. In the support portions 65B and 65C, the surface of the partition wall 65 on the transmission chamber 83 side is recessed, and the surface of the partition wall 65 on the clutch chamber 82 side is projected. The support portion 65B supports the front end portion of the counter shaft 23 via a bearing, and the support portion 65C supports the front end portion of the reverse shaft 34 via a bearing.

In FIGS. 5, 6 and 12, the oil storage chamber 43 is formed from the oil pan 41 arranged below the region of the peripheral wall 61 forming the clutch chamber 82 and to which the base plate 101 is fixed, and the lower surface of the peripheral wall 61. It is composed of a vertical wall portion 63 extending downward toward the peripheral edge portion of the oil pan 41, and a flange portion 63A formed at the lower end of the vertical wall portion 63 and joined to the oil pan 41. As shown in FIG. 12, when the transmission case 4 is viewed from below, the vertical wall portion 63 is formed in an annular shape or a rectangular shape. That is, when the transmission case 4 is viewed from below, the vertical wall portion 63 is formed not in a linear or arcuate shape but in a shape that orbits around the oil storage chamber 43, and is a closed region inside the vertical wall portion 63. (Oil storage chamber 43) is formed.

Next, the effect of the automatic transmission 2 configured as described above will be described.

In the automatic transmission 2 of this embodiment, the shift-and-select shaft 33 and the base plate 101 are arranged at positions adjacent to the partition wall 65 in the direction along the input shaft 21, and the base plate 101 is arranged with the outer surface of the clutch chamber 82 on the peripheral wall 61. It is fixed to the outer surface of the transmission chamber 83.

As described above, in this embodiment, since the shift and select shaft 33 and the base plate 101 are arranged at positions adjacent to the partition wall 65 in the direction along the input shaft 21, most of the base plate 101 is placed on the outer wall of the clutch chamber 82. Can be placed.

Further, since the base plate 101 is fixed to the outer wall of the clutch chamber 82 and the outer wall of the transmission chamber 83, the base plate 101 is relatively rigid among the transmission cases 4 because the partition wall 65 is arranged inside the base plate 101. Since it can be fixed to the high portion of the transmission case 4, the vibration of the transmission case 4 to which the base plate 101 is attached can be suppressed.

Further, in the transmission case 4, since the cross section of the transmission case 4 is larger in the clutch chamber 82 than in the transmission chamber 83, the base plate 101 is stabilized by fixing a part of the base plate 101 to the outer wall of the clutch chamber 82. It can be supported and the vibration of the shift unit 100 can be suppressed.

As a result, in the automatic transmission 2 in which the shift unit 100 is attached to the outer wall of the transmission case 4, vibration and noise generated in the transmission case 4 can be reduced.

In the automatic transmission 2 of the present embodiment, the partition wall 65 is formed with a cylindrical portion 66 through which the input shaft 21 passes so as to project toward the clutch chamber 82, and the base plate 101 is arranged in the direction along the input shaft 21. In this region, the inner surface of the peripheral wall 61, the partition wall 65, and the tubular portion 66 are connected by ribs 131 and 132.

As described above, in this embodiment, the rigidity of the region where the base plate 101 is fixed in the inner wall of the clutch chamber 82 can be improved by the ribs 131 and 132, and the vibration of the outer wall of the transmission case 4 can be suppressed. Therefore, the vibration and noise generated in the transmission case 4 can be reduced.

In the automatic transmission 2 of this embodiment, the torque converter 10 is arranged on the axis of the input shaft 21, and the friction clutch 17 is connected to the output side of the torque converter 10. Further, the transmission case 4 has an oil storage chamber 43 for storing oil supplied to the torque converter 10, and the oil storage chamber 43 is a region of the peripheral wall 61 that forms the clutch chamber 82 and the base plate 101 is fixed. An oil pan 41 arranged below the peripheral wall 61, a vertical wall portion 63 extending downward from the lower surface of the peripheral wall 61 toward the peripheral edge portion of the oil pan 41, and a vertical wall portion 63 formed at the lower end of the vertical wall portion 63 and joined to the oil pan 41. It is composed of a flange portion 63A and a flange portion 63A.

As described above, in this embodiment, the vertical wall portion 63 having the flange portion 63A having high rigidity is arranged below the region of the peripheral wall 61 that forms the clutch chamber 82 and to which the base plate 101 is fixed. The rigidity of the peripheral wall 61 in the region can be improved, and the vibration of the outer wall of the transmission case 4 can be suppressed. Therefore, the vibration and noise generated in the transmission case 4 can be reduced.

In the automatic transmission 2 of this embodiment, the vertical wall portion 63 is formed in an annular shape or a rectangular shape when the transmission case 4 is viewed from below.

As described above, in this embodiment, since the vertical wall portion 63 is formed in an annular shape or a rectangular shape, the rigidity of the vertical wall portion 63 can be improved in the vehicle front-rear direction and the vehicle width direction. Therefore, the vibration and noise generated in the transmission case 4 can be reduced.

Although embodiments of the present invention have been disclosed, it will be apparent to those skilled in the art that modifications 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.

2 ... Automatic transmission, 4 ... Transmission case, 10 ... Torque converter, 17 ... Friction clutch, 20 ... Transmission, 21 ... Input shaft, 33 ... Shift and Select shaft, 41 ... oil pan, 43 ... oil storage chamber, 61 ... peripheral wall, 63 ... vertical wall part, 63A ... flange part, 65 ... partition wall, 66 ... cylinder Shape, 82 ... clutch chamber, 83 ... transmission chamber, 100 ... shift unit, 101 ... base plate, 102 ... shift actuator, 103 ... clutch actuator, 131, 132 .. .rib

Claims (4)

Friction clutch and
A transmission having an input shaft to which power is transmitted from the friction clutch and a shift-and-select shaft for shifting,
A speed change having a peripheral wall that surrounds the friction clutch and the transmission from the outer peripheral side, and a partition wall that divides the inside of the peripheral wall into a clutch chamber in which the friction clutch is housed and a transmission room in which the transmission is housed. With the machine case,
An automatic transmission having a base plate fixed to the outer surface of the peripheral wall, a clutch actuator for operating the friction clutch, and a shift actuator in which a shift actuator for operating the shift and select shaft is attached to the base plate. It ’s a machine,
The shift-and-select shaft and the base plate are arranged at positions adjacent to the partition wall in the direction along the input shaft.
The base plate is arranged so as to straddle the partition wall in a direction along the input shaft, and is fixed to the outer surface of the clutch chamber and the outer surface of the transmission chamber on the peripheral wall by fastening at a plurality of fixing portions .
The plurality of fixing portions are arranged on both sides of the partition wall in a direction along the input axis.
An automatic transmission characterized in that the partition wall and the shift and select shaft are arranged between a plurality of fixed portions of the base plate in a direction along the input shaft . A cylindrical portion through which the input shaft passes is formed in the partition wall so as to project toward the clutch chamber side.
The automatic transmission according to claim 1, wherein in a region where the base plate is arranged in a direction along the input shaft, the inner surface of the peripheral wall, the partition wall, and the tubular portion are connected by ribs. .. A torque converter is arranged on the axis of the input shaft.
The friction clutch is connected to the output side of the torque converter.
The transmission case has an oil storage chamber for storing oil supplied to the torque converter.
The oil storage chamber includes an oil pan arranged below the region of the peripheral wall that forms the clutch chamber and to which the base plate is fixed, and downward from the lower surface of the peripheral wall toward the peripheral edge of the oil pan. The automatic transmission according to claim 1 or 2, wherein the vertical wall portion extends and a flange portion formed at the lower end of the vertical wall portion and joined to the oil pan. The automatic transmission according to claim 3, wherein the vertical wall portion is formed in an annular shape or a rectangular shape when the transmission case is viewed from below.

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