Vehicle transmission

Abstract

To provide a vehicle transmission which is disposed in a narrow space while improving support rigidity of an actuator against a transmission case.SOLUTION: A transmission 2 has an actuator 12 disposed forward of a front wall 3A of a transmission case 3. In the actuator 12, an engine 1 side end, an upper part at the side opposite to the engine 1, a lower part at the side opposite to the engine 1 are fastened to a bracket 11. In the bracket 11, a boss part 11b near an engine 1 side end (a boss part 11a) attached with the actuator 12, and a boss part 11d near an upper part (a boss part 11c) at the side opposite to the engine 1 attached with the actuator 12 are fastened to the transmission case 3.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a vehicle transmission. [Background technology]

[0002] As an example of mounting an actuator to a transmission case via a bracket, a support structure for electrical components is known in which electrical components are mounted to the outer peripheral surface of the transmission case via a lower bracket (see Patent Document 1).

[0003] This support structure for electrical components has a lower bracket that fixes the inverter, which extends vertically, to the upper surface of the transmission case, and an intermediate bracket and a mount that are fixed to the transmission case.

[0004] The lower end of the inverter is fastened to the front fastening portion and the rear fastening portion provided on the flat mounting portion of the lower bracket, and the lower bracket has a front fastening portion, a rear fastening portion and a left fastening portion extending downward from the mounting portion.

[0005] The front fastening portion and rear bracket are attached to the transmission case via an intermediate bracket, and the left fastening portion is attached to the transmission case via a mount attachment portion. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2023-150674 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the support structure for electrical components described in Patent Document 1, the inverter extends in the vertical direction, which increases the outer diameter dimension of the transmission case, and there is still room for improvement in terms of arranging the transmission in a narrow space.

[0008] Furthermore, since the fastening portion of the inverter on the lower bracket and the fastening portion to the transmission case (the fastening portion between the intermediate bracket and the mount attachment portion) are separated, there is still room for improvement in order to increase the support rigidity of the inverter relative to the transmission case.

[0009] The present invention has been made in light of the above-mentioned circumstances, and aims to provide a vehicle transmission that can be placed in a narrow space while increasing the support rigidity of the actuator relative to the transmission case. [Means for solving the problem]

[0010] The present invention provides a vehicle transmission including: a drive source having an output shaft extending in the vehicle width direction; a transmission case having a big end located on the drive source side and joined to the drive source; and a small end located on the anti-drive source side opposite the drive source in the axial direction of the output shaft and having a smaller diameter than the big end; an actuator arranged in front of a front wall of the transmission case; and a bracket arranged along the front wall of the transmission case for attaching the actuator to the transmission case, wherein the actuator has an end on the drive source side, an upper part on the anti-drive source side, and a lower part on the anti-drive source side fastened to the bracket, and the bracket is fastened to the transmission case near the end on the drive source side where the actuator is attached and near the upper part on the anti-drive source side where the actuator is attached. [Effects of the Invention]

[0011] As described above, according to the present invention, the support rigidity of the actuator relative to the transmission case can be increased, and the vehicle transmission can be arranged in a narrow space. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view of a vehicle transmission according to an embodiment of the present invention, showing a state in which an actuator and a bracket have been removed. [Figure 2]FIG. 2 is a front view of a vehicle transmission according to one embodiment of the present invention. [Figure 3] FIG. 3 is a front view of a vehicle transmission according to one embodiment of the present invention, showing a state in which the actuator has been removed. [Figure 4] FIG. 4 is a bottom view of a vehicle transmission according to one embodiment of the present invention, showing a state in which the actuator has been removed. [Figure 5] FIG. 5 is a bottom view of a vehicle transmission according to one embodiment of the present invention. [Figure 6] FIG. 6 is a left side view of a vehicle transmission according to one embodiment of the present invention. [Figure 7] FIG. 7 is a left side view of a vehicle transmission according to one embodiment of the present invention, showing a state in which the actuator has been removed. [Figure 8] FIG. 8 is a front view of a bracket for a vehicle transmission according to one embodiment of the present invention. [Figure 9] FIG. 9 is a left side view of a bracket for a vehicle transmission according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] A vehicle transmission according to one embodiment of the present invention is a vehicle transmission comprising: a drive source having an output shaft extending in the vehicle width direction; a transmission case having a big end located on the drive source side and joined to the drive source; and a small end located on the anti-drive source side opposite the drive source in the axial direction of the output shaft and having a smaller diameter than the big end; an actuator arranged in front of the front wall of the transmission case; and a bracket arranged along the front wall of the transmission case for attaching the actuator to the transmission case, wherein the actuator has an end on the drive source side, an upper part on the anti-drive source side, and a lower part on the anti-drive source side fastened to the bracket, and the bracket is fastened to the transmission case near the end on the drive source side where the actuator is attached and near the upper part on the anti-drive source side where the actuator is attached.

[0014] As a result, the vehicle transmission according to one embodiment of the present invention can be arranged in a narrow space while increasing the support rigidity of the actuator relative to the transmission case. [Example]

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle transmission according to an embodiment of the present invention will now be described with reference to the drawings. 1 to 9 are diagrams showing a vehicle transmission according to one embodiment of the present invention.

[0016] In Figures 1 to 9, the up, down, front, back, left and right directions are based on the vehicle transmission when installed in the vehicle, and the front and back direction of the vehicle is the front-to-rear direction, the left and right direction of the vehicle (vehicle width direction) is the left and right direction, and the up and down direction of the vehicle (vehicle height direction) is the up and down direction.

[0017] First, the configuration will be described. 1, an engine room (not shown) of a vehicle is provided with an engine 1 (see FIG. 2) as an internal combustion engine and a vehicle transmission 2 (hereinafter simply referred to as transmission 2) connected to the engine 1. In this embodiment, the engine 1 constitutes a drive source.

[0018] The transmission 2 is configured, for example, as an AMT (Automated Manual Transmission) and is disposed behind the radiator 10 (see FIG. 5). The transmission 2 includes a transmission case 3, which includes a left case 4 and a right case 5.

[0019] Flange portions 4A and 5A are formed on the mating surfaces of the left case 4 and the right case 5, and the left case 4 and the right case 5 are integrated by fastening the flange portions 4A and 5A with bolts (not shown).

[0020] 3, the light case 5 houses a clutch 1B (all shown in phantom lines) connected to a crankshaft 1A of the engine 1. In this embodiment, the crankshaft 1A extends in the vehicle width direction and constitutes an output shaft.

[0021] As shown in Figures 1 and 2, with respect to the right case 5, a flange portion 5A is formed on the left case 4 side, and a flange portion 5B is formed on the engine 1 side, which is opposite to the flange portion 5A, and the flange portion 5B is fastened to a cylinder block (not shown) of the engine 1 by a bolt (not shown).

[0022] The left case 4 is provided with a peripheral wall 4B, which extends from a left side wall 4C of the left case 4 toward the opposite side from the engine 1. A protruding end wall 4D is provided at the left end of the peripheral wall 4B, and the protruding end wall 4D is formed with a smaller diameter than the flange portion 5B. In other words, the flange portion 5B is formed with a larger diameter than the protruding end wall 4D.

[0023] In this embodiment, the peripheral wall 4B extends from the protruding end wall 4D toward the flange portion 5B, and the base portion on the flange portion 5B side is connected to the left side wall 4C. In other words, the peripheral wall 4B is formed in a tapered shape from the base portion on the left side wall 4C side toward the protruding end wall 4D.

[0024] In this embodiment, the flange portion 5B of the right case 5 forms the large end, and the protruding end wall 4D of the left case 4 forms the small end. Hereinafter, the flange portion 5B side of the right case 5 will also be referred to as the engine side, which is the drive source side, and the protruding end wall 4D side will also be referred to as the anti-engine side, which is the anti-drive source side.

[0025] In other words, the transmission case 3 of this embodiment has a flange portion 5B (big end) located on the engine 1 side and joined to the engine 1, and a protruding end wall 4D (small end) located on the opposite side of the engine 1 in the axial direction of the crankshaft 1A and having a smaller diameter than the flange portion 5B.

[0026] As shown in FIG. 3, the input shaft 6 and the countershaft 7 (both of which are shown by imaginary lines) are housed in the peripheral wall 4B, and the peripheral wall 4B surrounds the input shaft 6 and the countershaft 7.

[0027] Clutch 1B mechanically connects and disconnects crankshaft 1A from input shaft 6. When clutch 1B is engaged, power from engine 1 is transmitted from crankshaft 1A to input shaft 6, and when clutch 1B is disengaged, power transmitted from crankshaft 1A to input shaft 6 is interrupted.

[0028] The input shaft 6 and countershaft 7 are connected via a plurality of gear pairs (not shown) for shifting, and the power of the engine 1 is transmitted from the input shaft 6 via the gear pairs for shifting that correspond to the gear positions. The countershaft 7 transmits the power to a differential device (not shown) housed in the transmission case 3.

[0029] A motor housing wall 4E is provided in the left case 4, and a motor (not shown) is housed in the motor housing wall 4E. The motor transmits power to a differential device via a reduction mechanism (not shown).

[0030] In this embodiment, the input shaft 6 and the counter shaft 7 form a rotation shaft, and the left case 4 and the right case 5 are divided in the axial direction of the input shaft 6 and the counter shaft 7. In this embodiment, the right case 5 forms a first case portion, and the left case 4 forms a second case portion.

[0031] As shown in Figure 2, an actuator 12 is attached via a bracket 11 (see Figure 3) to the front wall 3A of the transmission case 3. The actuator 12 operates and controls the components housed in the transmission 2, and its functions and uses are not limited.

[0032] As shown in FIG. 1, the front wall 3A of the transmission case 3 is configured to include a front wall 5C of the right case 5, a front wall 4F of the left case 4, a bulging portion 4a of the peripheral wall 4B, and a front wall 4b.

[0033] The bulging portion 4a bulges forward from the front wall 4b of the peripheral wall 4B and extends in the vehicle width direction of the peripheral wall 4B.

[0034] The front wall 4F of the left case 4 is located rearward of the front wall 5C of the right case 5. In other words, the front wall 5C of the right case 5 bulges forward more than the front wall 4F of the left case 4.

[0035] The peripheral wall 4B (bulge 4a) is located rearward of the front wall 4F of the left case 4, and the front wall 4F of the left case 4 is connected to the base of the peripheral wall 4B via the left side wall 4C.

[0036] The front wall 3A of the transmission case 3 is formed in a stepped shape recessed rearward from the front side to the left, with the front wall 5C, the front wall 4F, and the peripheral wall 4B in that order.

[0037] As shown in Figures 3 and 8, bracket 11 has a fastening portion 11A located on the engine 1 side, a triangular middle portion 11B connected to fastening portion 11A, and an upper branch portion 11D that branches off from middle portion 11B, extends diagonally upward to the left, and has fastening portion 11C at its end on the opposite side of engine 1 in the extending direction.

[0038] The bracket 11 has a lower branch portion 11F that branches off from the intermediate portion 11B, extends diagonally downward to the left, and has a fastening portion 11E at the end on the opposite side of the engine 1 in the extending direction.

[0039] 8 and 9, the fastening portion 11A is provided with bosses 11a and 11b. The boss 11a protrudes forward from the fastening portion 11A, and the mounting surface at its tip faces slightly leftward (toward the small end) in the front-to-rear direction. A female screw hole is formed in the boss 11a so as to be perpendicular to the mounting surface and face slightly leftward (toward the small end) in the front-to-rear direction.

[0040] The boss portion 11b protrudes forward from the fastening portion 11A, and the attachment surface at the tip thereof faces the front-rear direction. The boss portion 11b has a through-hole formed therein that extends in the front-rear direction.

[0041] The fastening portion 11C is provided with bosses 11c and 11d. The boss 11c protrudes forward from the fastening portion 11C, and the mounting surface at its tip faces slightly leftward (toward the small end) in the front-to-rear direction. A female screw hole is formed in the boss 11c so as to be perpendicular to the mounting surface and tilted so as to face slightly leftward (toward the small end) in the front-to-rear direction.

[0042] Boss portion 11d is disposed diagonally above and to the left of boss portion 11c, with the mounting surface at its tip facing the front-rear direction, and boss portion 11d has a through-hole formed therein that extends in the front-rear direction.

[0043] The fastening portion 11E is provided with a boss portion 11e. The boss portion 11e protrudes forward from the fastening portion 11E, and the mounting surface at the tip of the boss portion 11e faces slightly leftward (toward the small end) in the front-to-rear direction. A female screw hole is formed in the boss portion 11e so as to be perpendicular to the mounting surface and face slightly leftward (toward the small end) in the front-to-rear direction.

[0044] In other words, boss portion 11a, boss portion 11c, and boss portion 11e have parallel mounting surfaces facing the same direction, slightly toward the small end, and the axes of the female screw holes formed in each are set to be parallel.

[0045] A backside fastening portion 11G is provided in the intermediate portion 11B between the fastening portion 11A and the fastening portions 11C and 11E.

[0046] The rear fastening portion 11G extends from the intermediate portion 11B toward the left case 4 (rearward), and has a boss portion 11f formed at the tip of the extending portion. A through hole extending in the axial direction of the input shaft 6 and the countershaft 7 is formed in the boss portion 11f.

[0047] As shown in FIG. 9, the middle portion 11B, the upper branch portion 11D and the back fastening portion 11G are connected by ribs 11H, and the middle portion 11B, the upper branch portion 11D and the back fastening portion 11G are reinforced by the ribs 11H.

[0048] The intermediate portion 11B, the lower branch portion 11F and the rear fastening portion 11G are connected by a rib 11J, and the intermediate portion 11B, the lower branch portion 11F and the rear fastening portion 11G are reinforced by the rib 11J.

[0049] 5, the actuator 12 is attached so that its reference shape surface faces slightly leftward (toward the small end) in the front-to-rear direction. Here, the reference shape surface is a surface defined by the axis of the shape that serves as the reference at the time of design.

[0050] As shown in FIG. 2, a fastening portion 12A is provided at the end of the actuator 12 on the engine 1 side, and a through-hole (not shown) extending perpendicularly to the reference shape surface is formed in the fastening portion 12A.

[0051] In the actuator 12, the bolt 21A is fastened to the boss portion 11a of the bracket 11 through the through-hole of the fastening portion 12A, whereby the fastening portion 12A is fastened to the boss portion 11a.

[0052] The fastening portion 12A of this embodiment constitutes the drive source side end of the actuator 12, and the boss portion 11a constitutes the drive source side end to which the actuator 12 is attached and the fastening portion between the first case portion.

[0053] A fastening portion 12B is provided on the upper portion of the actuator 12 on the side opposite to the engine 1, and a through-hole (not shown) extending perpendicularly to the reference shape surface is formed in the fastening portion 12B.

[0054] In the actuator 12, a bolt 21B is fastened to the boss portion 11c of the bracket 11 through a through-hole in the fastening portion 12B, whereby the fastening portion 12B is fastened to the boss portion 11c.

[0055] In this embodiment, the fastening portion 12B forms the upper portion of the actuator 12 on the side opposite the driving source and the fastening point of the upper portion of the actuator 12 on the side opposite the driving source that is fastened to the bracket 11, and the boss portion 11c forms the upper portion on the side opposite the driving source to which the actuator 12 is attached.

[0056] A fastening portion 12C is provided at the lower portion of the actuator 12 on the engine 1 side, and a through-hole (not shown) extending perpendicularly to the reference shape surface is formed in the fastening portion 12C.

[0057] In the actuator 12, the bolt 21C is passed through the through hole and fastened to the boss portion 11e of the bracket 11, thereby fastening the fastening portion 12C to the boss portion 11e. In this embodiment, the fastening portion 12C forms a lower portion of the actuator 12 on the side opposite the driving source and a fastening point for the lower portion of the actuator 12 on the side opposite the driving source that is fastened to the bracket 11.

[0058] In this way, the actuator 12 has its end on the engine 1 side, its upper part on the opposite side to the engine 1, and its lower part on the opposite side to the engine 1 fastened to the bracket 11, and is attached to the front wall 3A of the transmission case 3 via the bracket 11.

[0059] As shown in FIGS. 4 and 7, the bracket 11 is disposed along the front wall 3A of the transmission case 3.

[0060] Specifically, the front wall 3A of the transmission case 3 is formed in a stepped shape that recesses rearward from the front side, in the order of front wall 5C, front wall 4F, and peripheral wall 4B, so that the bracket 11 is positioned at an incline along the front wall 5C, front wall 4F, and peripheral wall 4B so that the engine 1 side is located forward and the opposite engine 1 side is located rearward relative to the engine 1 side.

[0061] In other words, the bracket 11 is disposed obliquely so that the closer it is to the protruding end wall 4D of the transmission case 3, the further rearward it becomes.

[0062] As shown in Fig. 1, a boss portion 5a is formed on the front wall 5C of the light case 5. The boss portion 5a protrudes forward from the front wall 5C, and the mounting surface at its tip faces the front-rear direction. A female screw hole extending in the front-rear direction is formed in the boss portion 5a so as to be perpendicular to the mounting surface. A boss portion 11b of the fastening portion 11A is fastened to the boss portion 5a with a bolt 21D (Figs. 3 and 7).

[0063] A boss portion 4c is formed on the bulging portion 4a of the peripheral wall 4B. The boss portion 4c protrudes forward from the bulging portion 4a, and the mounting surface at its tip faces the front-to-rear direction. A female screw hole extending in the front-to-rear direction is formed in the boss portion 4c so as to be perpendicular to the mounting surface. A boss portion 11d of the fastening portion 11C is fastened to the boss portion 4c with a bolt 21E (see FIGS. 3 and 7).

[0064] As shown in Fig. 7, the tip end position and mounting surface of boss portion 4c are located rearward of the tip end position and mounting surface of boss portion 5a. Also, as shown in Fig. 1, boss portion 4c is located closer to protruding end wall 4D than boss portion 5a.

[0065] This allows the bracket 11 to be arranged along the front wall 3A of the transmission case 3. Furthermore, by attaching the actuator 12 to the bracket 11 arranged along the front wall 3A of the transmission case 3, the actuator 12 can be arranged along the front wall 3A of the transmission case 3.

[0066] 8, boss portions 11a and 11b are arranged in fastening portion 11A, and boss portions 11c and 11d are arranged in fastening portion 11C. This allows boss portion 11a and boss portion 11b to be arranged close to each other, and boss portion 11c and boss portion 11d to be arranged close to each other.

[0067] That is, the bracket 11 has a fastening portion 11A, and the fastening portion 11A is provided with a boss portion 11a to which the fastening portion 12A of the actuator 12 is fastened and a boss portion 11b to which the boss portion 5a of the front wall 5C is fastened, so that the boss portion 11a and the boss portion 11b can be brought close to each other.

[0068] In addition, the bracket 11 has a fastening portion 11C, and the fastening portion 11C is provided with a boss portion 11c to which the fastening portion 12B of the actuator 12 is fastened, and a boss portion 11d to which the boss portion 4c of the bulge portion 4a is fastened, so that the boss portion 11c and the boss portion 11d can be brought close to each other.

[0069] The bracket 11 is fastened to the transmission case 3 near the end on the engine 1 side where the actuator 12 is attached and near the upper part on the opposite side to the engine 1 where the actuator 12 is attached.

[0070] In other words, the bracket 11 has a boss portion 11b near the boss portion 11a to which the actuator 12 is attached fastened to the transmission case 3, and a boss portion 11d near the boss portion 11c to which the actuator 12 is attached fastened to the transmission case 3.

[0071] As shown in Figure 3, the lower branch portion 11F of the bracket 11 extends diagonally downward to the left from the intermediate portion 11B downward beyond the peripheral wall 4B, and the fastening portion 11E has a protruding shape that does not have a fixed portion to the left case 4.

[0072] In other words, a peripheral wall 4B is formed on the left side of the left case 4, and the lower part of the peripheral wall 4B is formed so that it becomes more rearward as it goes downward. Therefore, when the actuator 12 is positioned at the same position in the left-right direction as the left side of the transmission case 3, at the lower front side of the front wall 3A, the lower branch portion 11F protrudes to the left away from the left case 4, and the fastening portion 11E has a protruding shape that does not have a fixed portion to the left case 4.

[0073] In this embodiment, the bracket 11 has a rear fastening portion 11G at the middle portion 11B. A boss portion 4d is provided on the left case 4, and the mounting surface at the tip of the boss portion 4d faces the left-right direction. A female screw hole extending in the left-right direction is formed in the boss portion 4d so as to be perpendicular to the mounting surface.

[0074] Specifically, as shown in FIG. 1, a boss portion 4d is provided below the intersection of the front wall 4F and the left side wall 4C of the left case 4, and a female screw hole extending in the left-right direction is formed in the boss portion 4d.

[0075] The rear fastening portion 11G is fastened to the left case 4 by inserting a bolt 21F (see FIG. 3) into the boss portion 11f of the rear fastening portion 11G in the axial direction of the input shaft 6 and fastening the bolt 21F to the boss portion 4d.

[0076] As shown in Figures 3 and 6, the back side fastening portion 11G is located at a height position between fastening portion 12B, which is the upper fastening point on the side of the actuator 12 opposite the engine 1, and fastening portion 12C, which is the lower fastening point, and the back side fastening portion 11G and boss portion 11a are located at approximately the same height position.

[0077] 1, the peripheral wall 4B and the left side wall 4C are connected by ribs 15, 16, and 17, and the peripheral wall 4B and the left side wall 4C are reinforced by the ribs 15, 16, and 17. The boss portion 4c is disposed above and adjacent to the rib 17.

[0078] As shown in FIG. 5, below the motor housing wall 4E, the peripheral wall 4B and the left side wall 4C are connected by a rib 18, and the peripheral wall 4B and the left side wall 4C are reinforced by the rib 18.

[0079] Next, the effects of the transmission 2 of this embodiment will be described. The transmission 2 of this embodiment is composed of an engine 1 having a crankshaft 1A extending in the vehicle width direction, a flange portion 5B located on the engine 1 side and joined to the engine 1, a transmission case 3 located on the opposite side of the engine 1 from the engine 1 in the axial direction of the crankshaft 1A and having a protruding end wall 4D having a smaller diameter than the flange portion 5B, an actuator 12 arranged in front of the front wall 3A of the transmission case 3, and a bracket 11 arranged along the front wall 3A of the transmission case 3 and attaching the actuator 12 to the transmission case 3.

[0080] In this way, since the bracket 11 is disposed along the front wall 3A of the transmission case 3 and mounts the actuator 12 to the transmission case 3, the actuator 12 can be disposed close to the transmission case 3.

[0081] This prevents the outer diameter of the transmission 2 from increasing, allowing the transmission 2 to be placed in the narrow space of the engine compartment.

[0082] Furthermore, according to the transmission 2 of this embodiment, the actuator 12 is fastened to the bracket 11 at its end on the engine 1 side, its upper part on the opposite side to the engine 1, and its lower part on the opposite side to the engine 1.

[0083] The bracket 11 is fastened to the transmission case 3 at a boss portion 11b near the end (boss portion 11a) on the engine 1 side where the actuator 12 is attached, and at a boss portion 11d near the top (boss portion 11c) on the opposite side from the engine 1 where the actuator 12 is attached.

[0084] In this way, by bringing the fastening point of the actuator 12 on the bracket 11 closer to the fastening point of the bracket 11 to the transmission case 3, that is, by bringing the boss portions 11a and 11b closer to each other and by bringing the boss portions 11c and 11d closer to each other, the supporting rigidity of the actuator 12 relative to the transmission case 3 can be increased.

[0085] Furthermore, the transmission 2 of this embodiment is disposed behind the radiator 10, and the actuator 12 is disposed obliquely along the front wall 3A of the transmission case 3.

[0086] In the left-right direction of the vehicle, the left edge of the radiator 10 is located in front of the actuator 12, and the actuator 12 is located so as to protrude to the left of the radiator 10, so the diagonally positioned actuator 12 is located so as to face to the left of the radiator 10.

[0087] The actuator 12 is also disposed toward the rear of the vehicle so that the further to the left it is, the farther it is from the radiator 10. This positional relationship ensures a large space between the actuator 12 and the radiator 10 (see FIG. 5).

[0088] Therefore, the actuator 12 can be attached to and detached from the transmission case 3 together with the bracket 11 by inserting a tool into the large space between the actuator 12 and the radiator 10 .

[0089] Furthermore, the fastening direction of actuator 12 and bracket 11 (the tightening direction of bolts 21A, 21B, and 21C) is set obliquely so as to face the left of radiator 10, so that the bolts can be pulled out toward the wide space between actuator 12 and radiator 10. As a result, the workability of actuator 12 replacement and maintenance work can be improved.

[0090] Furthermore, according to the transmission 2 of this embodiment, the transmission case 3 is arranged parallel to the crankshaft 1A and has an input shaft 6 and a countershaft 7 to which power is transmitted from the crankshaft 1A, and a peripheral wall 4B that extends from the protruding end wall 4D of the transmission case 3 toward the flange portion 5B and surrounds and houses the input shaft 6 and the countershaft 7.

[0091] The peripheral wall 4B has a bulging portion 4a that bulges forward, and the bulging portion 4a has a boss portion 4c that protrudes forward from the front portion thereof and to which the bracket 11 is fastened.

[0092] This allows the upper branch portion 11D of the bracket 11 to be fastened to the boss portion 4c provided on the bulging portion 4a, which has high rigidity, and the supporting rigidity of the actuator 12 can be increased more effectively.

[0093] Furthermore, since the boss portion 4c extends in the front-to-rear direction from the front of the bulge portion 4a rather than in the up-and-down direction, the height of the boss portion 4c itself can be kept low, the rigidity of the boss portion 4c can be easily ensured, and the vertical dimension of the actuator 12 can be prevented from becoming long.

[0094] Here, in the transmission 2 of this embodiment, the left case 4 is provided with a peripheral wall 4B, so when the actuator 12 is disposed below the transmission case 3, a large space exists between the actuator 12 and the peripheral wall 4B.

[0095] The lower branch portion 11F of the bracket 11 extends obliquely downward to the left from the middle portion 11B below the peripheral wall 4B, and the fastening portion 11E has a protruding shape that does not have a portion fixed to the left case 4.

[0096] In the transmission 2 of this embodiment, the bracket 11 has a backside fastening portion 11G. Backside fastening portion 11G is located at a height between boss portion 11c, which is an upper fastening point on the side opposite to engine 1 of actuator 12 fastened to bracket 11, and boss portion 11e, which is a lower fastening point, and extends from the back side of bracket 11 toward the transmission case 3, and is fastened to the transmission case 3 by being tightened in the axial direction of input shaft 6.

[0097] As a result, even if fastening portion 11E has a protruding shape that is not fixed to left case 4, bracket 11 can be fastened to left case 4 with high rigidity by rear fastening portion 11G.

[0098] Furthermore, even if the fastening portion 11E has a protruding shape that is not fixed to the left case 4, the fastening portion 12C of the actuator 12 can be fastened to the fastening portion 11E, thereby improving the degree of freedom in attaching the actuator 12 to the transmission case 3 while ensuring sufficient support rigidity of the actuator 12 to the left case 4 by the back side fastening portion 11G.

[0099] Furthermore, tightening work can be performed from the axial direction of the input shaft 6 by utilizing the space between the transmission case 3 and the actuator 12, improving workability and allowing the bracket 11 to be fastened to the left case 4 with high rigidity.

[0100] Furthermore, according to the transmission 2 of this embodiment, the transmission case 3 is composed of a left case 4 and a right case 5 that are divided in the axial direction of the input shaft 6 and joined together, and the left case 4 is composed of a peripheral wall 4B.

[0101] The fastening direction of transmission case 3 and bracket 11 (the tightening direction of bolts 21D and 21E) is parallel to the fastening surface of left case 4 and right case 5. More specifically, the tightening directions of bolts 21D and 21E are parallel, and both are in the front-to-rear direction. This setting makes it easier to design and manufacture the transmission case.

[0102] The engine 1 side of the bracket 11 is fastened to the right case 5 by the boss portion 11b of the fastening portion 11A, and the opposite side to the engine 1 is fastened to the left case 4 by the boss portion 11d of the fastening portion 11C. In addition, the boss portion 11a and the back side fastening portion 11G are located at approximately the same height.

[0103] This allows bracket 11 to be positioned across the separated left case 4 and right case 5 and fastened to the left case 4 and right case 5, and bracket 11 can be used as a reinforcing member, thereby improving the joining strength between left case 4 and right case 5.

[0104] Alternatively, engine 1 may be connected to the left case, with the flange of the left case serving as the big end, and the peripheral wall may be formed on the right case, with the protruding end wall of the peripheral wall serving as the small end.

[0105] While an embodiment of the present invention has been disclosed, it will be apparent to one skilled in the art that modifications may be made thereto without departing from the scope of the present invention, and it is intended that all such modifications and equivalents be included in the following claims. [Explanation of symbols]

[0106] 1 Engine (power source) 1A Crankshaft (output shaft) 3. Transmission case 3A Front wall 4 Left case (second case part) 4a Bulge 4B Peripheral wall 4c Boss part (boss part of bulge) 4D protruding end wall (small end) 5 Light case (first case part) 5A Flange part (big end) 6 Input shaft (rotating shaft) 7 Countershaft (rotating shaft) 11 Bracket 11a boss portion (end portion on the drive source side to which the actuator is attached, fastening portion with the first case portion) 11c Boss part (upper part on the side opposite the drive source where the actuator is attached) 11G Back side fastening part 12 Actuators 12A Fastening part (end of actuator drive source side) 12B Fastening portion (the upper part of the actuator on the drive source side, the upper part of the actuator on the opposite side of the drive source that is fastened to the bracket) 12C Fastening part (lower part of the actuator on the drive source side, fastening part of the lower part of the actuator on the opposite side of the drive source that is fastened to the bracket)

Claims

1. a drive source having an output shaft extending in the vehicle width direction; a transmission case having a big end located on the drive source side and joined to the drive source, and a small end located on the opposite side of the output shaft from the drive source in the axial direction, the small end having a smaller diameter than the big end; an actuator disposed in front of a front wall of the transmission case; a bracket disposed along a front wall of the transmission case and attaching the actuator to the transmission case, the actuator has an end portion on the drive source side, an upper portion on the opposite drive source side, and a lower portion on the opposite drive source side fastened to the bracket, a bracket fastened to the transmission case near the end on the drive source side where the actuator is attached and near the upper part on the opposite drive source side where the actuator is attached.

2. The transmission case is a plurality of rotating shafts arranged in parallel with the output shaft and to which power is transmitted from the output shaft; a peripheral wall that extends from the small end of the transmission case toward the large end and surrounds and houses the plurality of rotary shafts, The peripheral wall has a bulging portion that bulges forward, 2. The vehicle transmission according to claim 1, wherein the bulging portion has a boss portion that protrudes forward from a front portion of the bulging portion and to which the bracket is fastened.

3. The bracket has a rear fastening portion, The vehicle transmission according to claim 2, characterized in that the back-side fastening portion is located at a height position between an upper fastening point on the opposite side of the drive source of the actuator fastened to the bracket and a lower fastening point on the opposite side of the drive source, extends from the back surface of the bracket toward the transmission case, and is fastened to the transmission case in the axial direction of the rotating shaft.

4. the transmission case is configured by joining a first case portion and a second case portion that are divided in the axial direction of the rotary shaft, the second case portion is configured to include the peripheral wall, 4. The vehicle transmission according to claim 3, wherein the bracket is fastened to the first case portion and the second case portion, and the fastening portion with the first case portion and the back-side fastening portion are located at approximately the same height.

Images