Motor Mount System

Abstract

This motor mount system is provided with a motor unit (3), and a frame (2) that supports the motor unit (3) via four bush mounts (21). Each of the four bush mounts (21) has the same structure as the others. Among the four bush mounts (21), the bush mount (21) closest to the center of gravity (G1) of where driving reaction torque is input to the two bush mounts (21) located forward of the motor unit (3), or the center of gravity (G2) of where driving reaction torque is input to the two bush mounts (21) located rearward of the motor unit (3), is provided in a state of having been rotated into an orientation in which the stiffness of said bush mount against vertical loads is higher than that of the other bush mounts (21).

Description

Technical Field

[0001] The present invention relates to a motor mount system.

Background Art

[0002] In Patent Document 1, a pair of left and right motors whose rotation axes coincide coaxially in the vehicle width direction are arranged at the center in the vehicle width direction below the lower surface portion of the rear part of the vehicle body. The motors and the left and right rear wheels at positions substantially coinciding with the motors in the vehicle width direction are respectively connected by drive shafts, and the motors drive the left and right rear wheels to run. A generator that generates electric power for driving the motor by inputting the rotational output of the internal combustion engine is arranged at the center in the vehicle width direction in front of the motor. A cradle frame that integrally supports the generator and each of the left and right motors and extends in the front-rear direction on the lower surface portion of the vehicle body is provided, and the front and rear portions of the cradle frame are attached to the lower surface portion of the vehicle body via bush mounts.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above-described motor mount system, when the arrangement of the bush mounts arranged at four points is asymmetric so as to form a quadrangular shape in plan view, axial play may occur in the output shaft of the motor unit in a general usage of the bush mounts. Although it is possible to suppress the axial play of the output shaft of the motor unit by providing a rigidity difference according to the arrangement positions of the four bush mounts, in that case, it may not be possible to use the same parts (common parts) for all four bush mounts.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a motor mount system capable of suppressing shaft play of the output shaft of a motor unit caused by an asymmetrical arrangement of bush mounts by using the same parts for all four bush mounts.

Means for Solving the Problems

[0006] A motor mount system according to an aspect of the present invention includes a motor unit and a frame that supports the motor unit via four bush mounts. The four bush mounts have the same structure as each other. Among the four bush mounts, the bush mount closest to the center of gravity of the driving reaction force input to the two bush mounts arranged in front of the motor unit or the center of gravity of the driving reaction force input to the two bush mounts arranged behind the motor unit is provided in a state rotated in a direction in which the rigidity against the vertical load is higher than that of the other bush mounts.

Effects of the Invention

[0007] According to the present invention, there is provided a motor mount system capable of suppressing shaft play of the rotation shaft of a motor caused by an asymmetrical arrangement of bush mounts by using the same parts for all four bush mounts.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

BEST MODE FOR CARRYING OUT THE INVENTION

[0009] Embodiments will be described with reference to the drawings. In the description of the drawings, the same reference numerals are given to the same parts and the description thereof is omitted.

[0010] [Configuration of Motor Mount System 1] With reference to FIGS. 1 to 5, the configuration of the motor mount system 1 according to the present embodiment will be described. In the drawings, the front side of the vehicle is indicated as FR, the rear side of the vehicle is indicated as RR, the right side in the vehicle width direction is indicated as RH, and the left side in the vehicle width direction is indicated as LH.

[0011] In the present embodiment, the motor mount system 1 is mounted on a so-called hybrid vehicle (HEV). This hybrid vehicle has a drive source that combines an electric motor (motor) and an internal combustion engine such as a gasoline engine or a diesel engine.

[0012] In a certain embodiment, the motor mount system 1 can be mounted on a battery electric vehicle (BEV) having only an electric motor (motor) as a drive source.

[0013] In another embodiment, the motor mount system 1 can also be mounted on a fuel cell vehicle (FCV) having an electric motor (motor) as a drive source and driving this electric motor with electric power generated by a fuel cell.

[0014] The motor mount system 1 is arranged, for example, in a motor room provided at the rear of the vehicle. This motor mount system 1 includes a frame 2, a motor unit 3, and a motor mount unit 4.

[0015] Frame 2 is also referred to as a sub-frame. This frame 2 supports the motor unit 3 via four bushing mounts 21 described later.

[0016] Frame 2 has a pair of left and right side members 5 and a pair of front and rear cross members 6. Insulators 7 are provided at the front and rear ends of the side members 5 in the vehicle longitudinal direction, and the frame 2 is attached to the lower surface of a rear side member (not shown) via the insulators 7.

[0017] Two support holes 11 for press-fitting the bushing mounts 21 are provided in each of the front and rear cross members 6 such that the central axis C1 is along the vehicle longitudinal direction.

[0018] Two front support holes 11 are provided in the front cross member 6 such that the central axis C1 is along the vehicle longitudinal direction. On the other hand, two rear support holes 11 are provided in the rear cross member 6 such that the central axis C1 is along the vehicle longitudinal direction.

[0019] In the present embodiment, the height position in the vertical direction of the central axis C1 of the rear support hole 11 is formed to be higher than the height position in the vertical direction of the central axis C1 of the front support hole 11 (see FIG. 4).

[0020] In an embodiment, the height position in the vertical direction of the central axis C1 of the front support hole 11 may be formed to be higher than the height position in the vertical direction of the central axis C1 of the rear support hole 11.

[0021] In another embodiment, the height positions in the vertical direction of the central axis C1 may be made equal in the front support hole 11 and the rear support hole 11.

[0022] The motor unit 3 is arranged such that the output shaft 12 is along the vehicle width direction and generates a driving torque T for vehicle running. This motor unit 3 has a motor 13 and a planetary gear mechanism 14 as a speed reducer.

[0023] At the lower part of the motor unit 3, four boss portions 15 to which the bush mount 21 is fastened are formed, and each of the boss portions 15 is provided with a bolt hole 16 as a fastening hole.

[0024] Two bolt holes 16 are provided at each of the front and rear portions of the motor unit 3, and the central axes C2 of the four bolt holes 16 are formed along the longitudinal direction of the vehicle.

[0025] At the front portion of the motor unit 3, a front bolt hole 16 is provided with its central axis C2 arranged along the longitudinal direction of the vehicle. On the other hand, at the rear portion of the motor unit 3, a rear bolt hole 16 is provided with its central axis C2 arranged along the longitudinal direction of the vehicle.

[0026] In the present embodiment, similar to the support hole 11, the vertical height position of the central axis C2 of the rear bolt hole 16 is formed to be higher than the vertical height position of the central axis C2 of the front bolt hole 16 (see FIG. 4).

[0027] In a certain embodiment, similar to the case of the support hole 11, the vertical height position of the central axis C2 of the front bolt hole 16 may be formed to be higher than the vertical height position of the central axis C2 of the rear bolt hole 16.

[0028] In another embodiment, similar to the case of the support hole 11, the vertical height positions of the central axis C2 of the front bolt hole 16 and the rear bolt hole 16 may be formed to be equal.

[0029] In the present embodiment, the motor 13 is a coaxial motor.

[0030] In a certain embodiment, the motor 13 may be another type of motor such as a parallel-axis motor.

[0031] In another embodiment, the motor unit 3 may not have a speed reducer and may be composed of the motor 13 alone.

[0032] The motor mount unit 4 includes a bush mount (motor mount) 21 as an insulator and a stopper 22.

[0033] Two bush mounts 21 are provided on each of the front and rear sides of the motor unit 3 such that the central axis C3 extends along the vehicle longitudinal direction, and four bush mounts 21 are provided to input the reaction force of the driving torque T in the vertical direction.

[0034] Two front bush mounts 21 are provided in front of the motor unit 3 such that the central axis C3 extends along the vehicle longitudinal direction. On the other hand, two rear bush mounts 21 are provided behind the motor unit 3 such that the central axis C3 extends along the vehicle longitudinal direction.

[0035] The four bush mounts 21 have the same structure, and each is configured such that the rigidity (load resistance) against the load in the direction orthogonal to the central axis C3 changes along the circumferential direction.

[0036] Each of the four bush mounts 21 has an inner cylinder 31 fastened to the motor unit 3 by a fastening member (bolt) 23, an outer cylinder 32 press-fitted into a support hole 11 provided in the frame 2, and an elastic body 33 provided between the outer periphery of the inner cylinder 31 and the inner periphery of the outer cylinder 32.

[0037] The inner cylinder 31 has a long hole 34 through which the shaft portion of the fastening member 23 is inserted. The outer diameter of the outer cylinder 32 is slightly larger than the inner diameter of the support hole 11 in order to press-fit the outer cylinder 32 into the support hole 11.

[0038] Slits 35a, 35b, 35c, and 35d are formed in the upper, lower, left, and right portions of the elastic body 33 (see FIG. 5). The bush mount 21 having such an elastic body 33 is configured to mainly receive the load as a shear load.

[0039] When the lower part of the elastic body 33 in FIG. 5 is set at the 0° position, the slit 35a is formed at the 0° position (the lower part of the elastic body 33). Also, in the clockwise direction from the 0° position, the slit 35b is formed at the 90° position (the right part in the vehicle width direction of the elastic body 33), the slit 35c is formed at the 180° position (the upper part of the elastic body 33), and the slit 35d is formed at the 270° position (the left part in the vehicle width direction of the elastic body 33).

[0040] In this embodiment, among the four slits 35a, 35b, 35c, and 35d, the slit 35a at the 0° position has the largest opening area when viewed from the vehicle longitudinal direction. Also, among the four slits 35a, 35b, 35c, and 35d, the slit 35c at the 180° position has the smallest opening area when viewed from the vehicle longitudinal direction.

[0041] Also, in the bush mount 21 in FIG. 5, the elongated hole 34 of the inner cylinder 31 is formed along the vehicle width direction (the left - right direction in FIG. 5).

[0042] The inner cylinder 31 and the outer cylinder 32 are formed of a metal material such as aluminum or iron, for example. On the other hand, the elastic body 33 is formed of an elastic member such as rubber, for example.

[0043] The stopper 22 has a stopper plate 41 and an elastic ring 42.

[0044] The stopper plate 41 is formed of a metal material such as aluminum or iron, for example. On the other hand, the elastic ring 42 is formed of an elastic member such as rubber, for example.

[0045] The stopper plate 41 functions as a washer interposed between the end face of the inner cylinder 31 of the bush mount 21 and the head of the fastening member (bolt) 23, and has a function of regulating the rocking amount of the motor unit 3 in the vehicle longitudinal direction.

[0046] In this embodiment, a front stopper plate 41 is attached to the front side of the front bush mount 21, and a rear stopper plate 41 is attached to the rear side of the rear bush mount 21.

[0047] The front and rear stopper plates 41 are each fastened to the inner cylinder 31 by a fastening member 23 and extend from the inner peripheral side to the outer peripheral side to a position facing the outer cylinder 32 or the peripheral edge of the support hole 11 in the vehicle longitudinal direction.

[0048] A recess 43 for accommodating the end portion of the fastening member 23 is provided on the front surface of the front stopper plate 41 attached to the front bush mount 21, and the peripheral edge of the recess 43 is located in front of the end portion of the fastening member 23 in the vehicle longitudinal direction.

[0049] In this embodiment, an annular convex portion 45 protruding forward in the vehicle longitudinal direction is formed on the front stopper plate 41, and a recess 43 is provided inward in the radial direction of the convex portion 45.

[0050] In order to accommodate the end portion of the fastening member 23 in the recess 43 of the front stopper plate 41, the depth of the recess 43 is larger than the length from the bottom surface of the recess 43 to the tip of the head of the fastening member 23.

[0051] On the other hand, an elastic ring 42 is disposed on the rear surface of the front stopper plate 41, and this elastic ring 42 faces the peripheral edge of the outer cylinder 32 or the support hole 11.

[0052] Among the clearances CL1 in the vehicle longitudinal direction between the front stopper 22 and the peripheral edge of the outer cylinder 32 or the support hole 11, the minimum clearance is smaller than the minimum clearance in the vehicle longitudinal direction between the motor unit 3 and the frame 2 on the rear side of the motor unit 3.

[0053] A recess 43 for accommodating the end portion of the fastening member 23 is provided on the rear surface of the rear stopper plate 41 attached to the rear bush mount 21, and the peripheral edge of the recess 43 is located behind the end portion of the fastening member 23 in the vehicle longitudinal direction.

[0054] In this embodiment, an annular convex portion 45 protruding rearward in the vehicle longitudinal direction is formed on the rear stopper plate 41, and a concave portion 43 is provided radially inward of the convex portion 45.

[0055] In order to accommodate the end portion of the fastening member 23 in the concave portion 43 of the rear stopper plate 41, the depth of the concave portion 43 is larger than the length from the bottom surface of the concave portion 43 to the tip of the head of the fastening member 23.

[0056] On the other hand, an elastic ring 42 is disposed on the front surface of the rear stopper plate 41, and this elastic ring 42 faces the outer cylinder 32 or the peripheral edge of the support hole 11.

[0057] Among the clearances CL2 in the vehicle longitudinal direction between the rear stopper 22 and the peripheral edge of the outer cylinder 32 or the support hole 11, the minimum clearance is smaller than the minimum clearance in the vehicle longitudinal direction between the motor unit 3 and the frame 2 on the front side of the motor unit 3.

[0058] In an embodiment, the front stopper plate 41 may be attached to the front side of the rear bush mount 21, and the rear stopper plate 41 may be attached to the rear side of the front bush mount 21.

[0059] In another embodiment, the front stopper plate 41 may be attached to the front side of the front bush mount 21, and the rear stopper plate 41 may be attached to the rear side of the front bush mount 21.

[0060] In still another embodiment, the front stopper plate 41 may be attached to the front side of the rear bush mount 21, and the rear stopper plate 41 may be attached to the rear side of the rear bush mount 21.

[0061] FIG. 6 shows the frame 2 in plan view and four bush mounts 21 in front view. And the dash-dotted line O1 indicates the center of the output shaft of the motor unit 3, and the dash-dotted line O2 indicates the roll center of the motor unit 3.

[0062] Of the four bush mounts 21, the front bush mount 21 disposed in front of the motor unit 3 is arranged at a position with respect to the center of gravity (virtual input center) G1 of the driving reaction force input to the two front bush mounts 21 Symmetry as described below.

[0063] That is, the front bush mount 21 disposed in front of the motor unit 3 is arranged such that the distances from the center of gravity G1 of the driving reaction force input to the two front bush mounts 21 are substantially equal to each other.

[0064] On the other hand, of the four bush mounts 21, the rear bush mount 21 disposed behind the motor unit 3 is arranged at a position that is not Symmetry as described below with respect to the center of gravity (virtual input center) G2 of the driving reaction force input to the two rear bush mounts 21.

[0065] Specifically, the rear bush mount 21 on the right side in the vehicle width direction is arranged closer to the inside in the vehicle width direction from a position where Symmetry it is as described below with respect to the center of gravity G2 of the driving reaction force input to the two rear bush mounts 21.

[0066] That is, the rear bush mount 21 on the right side in the vehicle width direction is arranged such that the distance from the center of gravity G2 of the driving reaction force input to the two rear bush mounts 21 is shorter than that of the rear bush mount 21 on the left side in the vehicle width direction.

[0067] In the present embodiment, among the four bush mounts 21, the rear bush mount 21 on the right side in the vehicle width direction, which is closest to the centers of gravity G1 and G2 of the driving reaction force described above, is provided in a state of being rotated in a direction in which the rigidity with respect to the vertical load is higher than that of the other bush mounts 21.

[0068] Specifically, the front bush mount 21 is arranged such that the slit 35a having the largest opening area when viewed from the vehicle front-rear direction receives the driving reaction force in the direction (acceleration direction), that is, upward in the present embodiment.

[0069] In addition, the rear bushing mount 21 on the left side in the vehicle width direction is arranged such that the slit 35a having the largest opening area when viewed from the vehicle longitudinal direction receives the driving reaction force in the direction (acceleration direction), that is, downward in this embodiment.

[0070] And the rear bushing mount 21 on the right side in the vehicle width direction is arranged in a state rotated 90° clockwise compared to the rear bushing mount 21 on the left side in the vehicle width direction. For this reason, the rear bushing mount 21 on the right side in the vehicle width direction is arranged such that the slit 35a having the largest opening area when viewed from the vehicle longitudinal direction faces the outside in the vehicle width direction, that is, the right side in the vehicle width direction in this embodiment.

[0071] Among the four bushing mounts 21, the rear bushing mount 21 on the right side in the vehicle width direction provided in a state rotated in a direction where the rigidity against the vertical load is higher than that of the other bushing mounts 21 is arranged such that the long axis of the long hole 34 is along the vertical direction. On the other hand, the other bushing mounts 21 are arranged such that the long axis of the long hole 34 is along the vehicle width direction.

[0072] In one embodiment, the front bushing mount 21 on the left side in the vehicle width direction located diagonally to the rear bushing mount 21 on the right side in the vehicle width direction may be provided in a state rotated in a direction where the rigidity against the vertical load is higher than that of the other bushing mounts 21.

[0073] In another embodiment, both the rear bushing mount 21 on the right side in the vehicle width direction and the front bushing mount 21 on the left side in the vehicle width direction may be provided in a state rotated in a direction where the rigidity against the vertical load is higher than that of the other bushing mounts 21.

[0074] [Regulation of the rocking amount of the motor unit 3 with respect to the vehicle longitudinal direction] Hereinafter, with reference to FIG. 4, the operation and effect of regulating the rocking amount of the motor unit 3 with respect to the vehicle longitudinal direction will be described.

[0075] In this embodiment, a front stopper 22 (front stopper plate 41) is attached to the front side of the front bush mount 21. Among the clearances CL1 in the vehicle longitudinal direction between the front stopper 22 and the outer cylinder 32 or the peripheral edge of the support hole 11, the minimum clearance is smaller than the minimum clearance in the vehicle longitudinal direction between the motor unit 3 and the frame 2 on the rear side of the motor unit 3.

[0076] Therefore, when the motor unit 3 swings rearward in the vehicle longitudinal direction, the front stopper 22 always comes into contact with the outer cylinder 32 or the peripheral edge of the support hole 11 first. Thus, the swing amount of the motor unit 3 in the rearward direction of the vehicle longitudinal direction can be restricted. Thereby, contact between the motor unit 3 and the frame 2 can be avoided.

[0077] On the other hand, a rear stopper 22 (rear stopper plate 41) is attached to the rear side of the rear bush mount 21. Among the clearances CL2 in the vehicle longitudinal direction between the rear stopper 22 and the outer cylinder 32 or the peripheral edge of the support hole 11, the minimum clearance is smaller than the minimum clearance in the vehicle longitudinal direction between the motor unit 3 and the frame 2 on the front side of the motor unit 3.

[0078] Therefore, when the motor unit 3 swings forward in the vehicle longitudinal direction, the rear stopper 22 always comes into contact with the outer cylinder 32 or the peripheral edge of the support hole 11 first. Thus, the swing amount of the motor unit 3 in the forward direction of the vehicle longitudinal direction can be restricted. Thereby, contact between the motor unit 3 and the frame 2 can be avoided.

[0079] [Suppression of shaft play of the output shaft of the motor unit 3] Hereinafter, with reference to FIGS. 6 and 7, the operation and effect of suppressing the shaft play of the output shaft of the motor unit 3 will be described.

[0080] In this embodiment, among the four bush mounts 21, the rear bush mount 21 on the right side in the vehicle width direction is relative to the center of gravity G2 of the driving reaction force input to the two rear bush mounts 21 SymmetryIt is arranged by being shifted inward in the vehicle width direction from the position where it becomes.

[0081] For this reason, the force F1 acting on the rear bush mount 21 on the right side in the vehicle width direction and the force F4 acting on the front bush mount 21 on the left side in the vehicle width direction located diagonally to the square are larger than the forces F2 and F3 acting on the other bush mounts 21.

[0082] When the rigidity of the four bush mounts 21 with respect to the vertical load is all the same, a difference occurs in the vertical displacement amounts D1 to D4 between the rear bush mount 21 on the right side in the vehicle width direction and the front bush mount 21 on the left side in the vehicle width direction, and the other bush mounts 21. As a result, shaft play may occur in the output shaft 12 of the motor unit 3.

[0083] Therefore, in the present embodiment, among the four bush mounts 21, the rear bush mount 21 on the right side in the vehicle width direction closest to the centers of gravity G1 and G2 of the driving reaction forces described above is provided in a state rotated in a direction in which the rigidity with respect to the vertical load is higher than that of the other bush mounts 21.

[0084] For this reason, even when the rear bush mount 21 on the right side in the vehicle width direction and the front bush mount 21 on the left side in the vehicle width direction receive large forces F1 and F4 in the vertical direction, it becomes difficult for them to displace. As a result, the vertical displacement amounts D1 to D4 can be made equal between the rear bush mount 21 on the right side in the vehicle width direction and the front bush mount 21 on the left side in the vehicle width direction, and the other bush mounts 21, and the shaft play of the output shaft 12 of the motor unit 3 can be reduced.

[0085] [Operation effects, etc.] The operation effects according to the present embodiment will be described below.

[0086] (1) The motor mount system 1 includes a motor unit 3 that is arranged such that the output shaft 12 extends along the vehicle width direction and generates drive torque for vehicle travel. The motor mount system 1 includes four bush mounts 21 that are arranged in pairs in front of and behind the motor unit 3, with their central axes C3 extending along the vehicle longitudinal direction, and to which reaction forces of the drive torque T are input in the vertical direction. The motor mount system 1 includes a frame 2 that supports the motor unit 3 via the four bush mounts 21. The four bush mounts 21 have the same structure, and each is configured such that the rigidity against loads in a direction orthogonal to the central axis C3 varies along the circumferential direction. Of the four bush mounts 21, at least one of the first bush mount 21 closest to the center of gravity G1 of the drive reaction forces input to the two bush mounts 21 arranged in front of the motor unit 3 or the center of gravity G2 of the drive reaction forces input to the two bush mounts 21 arranged behind the motor unit 3, and the second bush mount 21 located diagonally to the first bush mount 21 in a quadrilateral with the positions of the four bush mounts 21 as vertices, is provided in a state rotated in a direction in which the rigidity against vertical loads is higher than that of the other bush mounts 21.

[0087] The four bush mounts 21 have the same structure. At least one of the first bush mount 21 closest to the centers of gravity G1, G2 of the drive reaction forces for the four bush mounts 21 and the second bush mount 21 located diagonally to the first bush mount 21 is provided in a state rotated in a direction in which the rigidity against vertical loads is higher than that of the other bush mounts 21.

[0088] For this reason, even when the inner cylinders 31 of the first and second bush mounts 21 receive a large force in the vertical direction, it becomes difficult for them to displace. As a result, it is possible to make the vertical displacement amounts D1, D2, D3, D4 between the inner cylinders 31 of the first and second bush mounts 21 and the inner cylinders 31 of the other bush mounts 21 equal, and the shaft play of the output shaft 12 of the motor unit 3 can be reduced.

[0089] That is, by arranging the four bush mounts 21 as described above, a rigidity difference can be provided according to the arrangement positions of the four bush mounts 21. Therefore, the displacement amounts D1, D2, D3, and D4 of the four bush mounts 21 when receiving the driving reaction force can all be made equal, and the shaft deflection of the output shaft 12 of the motor unit 3 caused by the asymmetric arrangement of the bush mounts 21 can be suppressed.

[0090] And since the four bush mounts 21 have the same structure as each other, all four bush mounts 21 can be unified with the same parts, and commonization of parts can be achieved.

[0091] (2) The bush mount 21 has an inner cylinder 31 having a long hole 34 through which the shaft portion of the fastening member 23 is inserted and is fastened to the motor unit 3 by the fastening member 23, and an outer cylinder 32 press-fitted into a support hole 11 provided in the frame 2. The bush mount 21 has an elastic body 33 provided between the outer periphery of the inner cylinder 31 and the inner periphery of the outer cylinder 32. Among the four bush mounts 21, at least one of the first and second bush mounts 21 provided in a state rotated in a direction in which the rigidity against the load in the vertical direction is higher than that of the other bush mounts 21 is arranged such that the major axis of the long hole 34 is along the vertical direction. The other bush mounts 21 are arranged such that the major axis of the long hole 34 is along the vehicle width direction.

[0092] Among the four bush mounts 21, at least one of the first and second bush mounts 21 provided in a state rotated in a direction in which the rigidity against the load in the vertical direction is higher than that of the other bush mounts 21 is arranged such that the major axis of the long hole 34 is along the vertical direction. On the other hand, the other bush mounts 21 are arranged such that the major axis of the long hole 34 is along the vehicle width direction.

[0093] Therefore, a rigidity difference can be provided between the first and second bush mounts 21 arranged such that the major axis of the long hole 34 extends along the vertical direction and other bush mounts 21 arranged such that the major axis of the long hole 34 extends along the vehicle width direction. Thereby, both setting of the rigidity difference and absorption of component variations can be achieved.

[0094] That is, by arranging the four bush mounts 21 as described above, component variations of the motor mount system 1 can be absorbed. Specifically, among the four bush mounts 21, by making the long holes of three bush mounts 21 horizontal holes and the long hole of the remaining one bush mount 21 a vertical hole, component variations of the motor mount system 1 can be absorbed. Therefore, by attaching the bush mount 21 described above in a state rotated by 90°, both setting of the rigidity difference and absorption of component variations can be achieved.

[0095] As described above, embodiments of the present invention have been described, but it should not be understood that the descriptions and drawings forming a part of this disclosure limit this invention. Various alternative embodiments, examples, and operation techniques will be apparent to those skilled in the art from this disclosure.

Description of Reference Numerals

[0096] 1 Motor mount system 2 Frame 11 Support hole 12 Output shaft 21 Bush mount (motor mount) 22 Stopper 23 Fastening member (bolt) 31 Inner cylinder 32 Outer cylinder 33 Elastic body 34 Long hole G1 Center of gravity (virtual input center) G2 Center of gravity (virtual input center) T Driving torque

Claims

1. A motor unit that generates drive torque for vehicle travel, disposed such that an output shaft extends along the vehicle width direction, Four bush mounts, two each in front of and behind the motor unit, disposed such that their central axes extend along the vehicle longitudinal direction, and into which reaction forces of the drive torque are input in the vertical direction, A frame that supports the motor unit via the four bush mounts, comprising: The four bush mounts have the same structure, and are each configured such that rigidity against loads in a direction orthogonal to the central axis varies along the circumferential direction, Among the four bush mounts, at least one of a first bush mount closest to the center of gravity of the reaction forces input to the two bush mounts disposed in front of the motor unit, or the center of gravity of the reaction forces input to the two bush mounts disposed behind the motor unit, and a second bush mount located diagonally to the first bush mount in a quadrilateral having the positions of the four bush mounts as vertices, is provided in a state rotated in a direction in which rigidity against vertical loads is higher than that of the other bush mounts. A motor mount system.

2. The bush mount has an inner cylinder having a long hole through which a shaft portion of a fastening member is inserted and fastened to the motor unit, an outer cylinder press-fitted into a support hole provided in the frame, and an elastic body provided between an outer periphery of the inner cylinder and an inner periphery of the outer cylinder. Among the four bush mounts, at least one of the first and second bush mounts provided in a state rotated in a direction in which rigidity against vertical loads is higher than that of the other bush mounts is disposed such that the major axis of the long hole extends along the vertical direction. The other bush mounts are disposed such that the major axis of the long hole extends along the vehicle width direction. The motor mount system according to claim 1.

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