Suspension member structure

Abstract

To obtain a suspension member structure that allows the motor mount to be press-fitted into the suspension member in a stable position. [Solution] The suspension member structure comprises a suspension member 12 and a motor mount 16. The suspension member 12 has a pair of side member portions 18 and motor mount mounting holes 40 formed in each of the pair of side member portions 18. The motor mount 16 is press-fitted into the motor mount mounting holes 40 from the outside in the vehicle width direction. A step 52 with a difference in height in the vehicle width direction is formed on the periphery of the motor mount mounting hole 40 at the inner portion in the vehicle width direction of the side member portion 18. On both sides of the step 52 at the periphery of the motor mount mounting hole 40, a front flat portion 54 and a rear flat portion 56 are provided, respectively, with their surfaces facing in a direction perpendicular to the direction in which the motor mount 16 is press-fitted into the motor mount mounting hole 40.

Description

【Technical Field】 【0001】 The present invention relates to a suspension member structure. 【Background Art】 【0002】 Patent Document 1 below discloses a vehicle rear structure equipped with motors that independently drive the left and right rear wheels. The rear part of the vehicle described in this document includes a pair of left and right rear side frames extending in the vehicle longitudinal direction, a pair of left and right motors that independently drive the left and right rear wheels, a motor mounting member for attaching the pair of left and right motors to the vehicle body, and a cross member extending in the vehicle width direction behind the pair of left and right motors. The rear part of the motor mounting member is connected to the cross member, and the front part thereof is connected to the pair of left and right rear side frames. Thereby, the pair of left and right motors are attached to the vehicle body via the motor mounting member. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Unexamined Patent Application Publication No. 2012 - 041009 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 By the way, in a configuration where a motor is supported by a suspension member via a motor mount and the motor mount is press - fitted to the suspension member, it is desirable that the motor mount can be press - fitted to the suspension member in a stable posture. 【0005】 In consideration of the above facts, an object of the present invention is to obtain a suspension member structure capable of press - fitting a motor mount to a suspension member in a stable posture. 【Means for Solving the Problems】 【0006】 The suspension member structure of the first embodiment comprises a suspension member having a pair of side member portions extending in the longitudinal direction of the vehicle on both sides in the vehicle width direction, and mounting holes formed in each of the pair of side member portions and penetrating in the vehicle width direction, and a motor mount attached to the suspension member in a state where it is press-fitted into the mounting holes from the outside in the vehicle width direction and supports a motor, wherein a step having a difference in height in the vehicle width direction is formed on the periphery of the mounting hole in the inner portion in the vehicle width direction of the side member portion, and flat portions are provided on both sides of the step on the periphery of the mounting hole, with the surface facing in a direction perpendicular to the direction in which the motor mount is press-fitted into the mounting hole. 【0007】 In the suspension member structure of the first embodiment, a step is formed on the periphery of the mounting hole in the inner portion in the vehicle width direction of the side member portion that constitutes a part of the suspension member, with a difference in height in the vehicle width direction. Furthermore, on both sides of the step at the periphery of the mounting hole, flat surfaces are provided, with their faces oriented perpendicular to the direction in which the motor mount is press-fitted into the mounting hole. In this configuration, by bringing a jig or the like into contact with the flat surfaces formed on both sides of the step at the periphery of the mounting hole, the load when the motor mount is press-fitted into the mounting hole can be received. This allows the motor mount to be press-fitted into the suspension member in a stable position. 【0008】 The suspension member structure of the second embodiment is the suspension member structure of the first embodiment, wherein, when viewed from the inside in the vehicle width direction, the flat portion formed on one side of the step at the periphery of the mounting hole is formed in a C shape along the periphery of the mounting hole, and the flat portion formed on the other side of the step at the periphery of the mounting hole is formed in a C shape along the periphery of the mounting hole. 【0009】 In the suspension member structure of the second embodiment, the flat portion formed on one side of the mounting hole's periphery, separated by a step, is formed in a C-shape along the periphery of the mounting hole. Similarly, the flat portion formed on the other side of the mounting hole's periphery, separated by a step, is also formed in a C-shape along the periphery of the mounting hole. This configuration suppresses an increase in the area of ​​the flat portions compared to a configuration in which each flat portion is not formed in a C-shape along the periphery of the mounting hole. As a result, for example, it is possible to suppress an increase in processing time when forming the flat portions by machining. [Effects of the Invention] 【0010】 The suspension member structure according to the present invention has the excellent effect of allowing the motor mount to be pressed into the suspension member in a stable position. [Brief explanation of the drawing] 【0011】 [Figure 1] This is a plan view showing suspension members, etc. [Figure 2] This is a side view showing the suspension members, etc. [Figure 3] This is an enlarged perspective view of the right-side side member section, showing the area where the mounting holes are formed, as seen from the inside in the vehicle width direction. [Figure 4] This is a cross-sectional view showing a suspension member, etc., obtained by cutting along the front-rear and vehicle width directions at the portion of the right-side member where mounting holes are formed. [Modes for carrying out the invention] 【0012】 The rear section 10 of a vehicle to which the suspension member structure according to an embodiment of the present invention is applied will be described using Figures 1 to 4. Arrows FR shown as appropriate in each figure indicate the front side of the vehicle, arrows UP indicate the upper side of the vehicle, arrows LH indicate the left side in the vehicle width direction (left-right direction), and arrows RH indicate the right side in the vehicle width direction (left-right direction). Furthermore, in the following description, unless otherwise specified, when the front-rear, up-down, and left-right directions are indicated, they refer to the front-rear direction of the vehicle, the up-down direction of the vehicle, and the left-right direction of the vehicle. 【0013】 As shown in Figures 1 and 2, a suspension member 12 is provided at the rear 10 of a vehicle to which the suspension member structure of this embodiment is applied. Various arms and the like that which support the left and right rear wheels (not shown) are attached to this suspension member 12. Note that in Figures 1 and 2, the parts of the suspension member 12 to which the various arms and the like are attached are omitted. In addition, a motor 14 for driving the left and right rear wheels is supported on the suspension member 12 via a motor mount 16. 【0014】 The suspension member 12 is formed, for example, from aluminum die-casting, and has a configuration in which the parts described later are integrally formed. This suspension member 12 includes a pair of left and right side member portions 18 that extend in the front-rear direction on both sides in the vehicle width direction, and a front cross member portion 20 that connects the front ends of the pair of left and right side member portions 18 in the left-right direction. The suspension member 12 also includes a rear cross member portion 22 that connects the rear ends of the pair of left and right side member portions 18 in the left-right direction, and an intermediate cross member portion 24 that connects the middle portions of the pair of left and right side member portions 18 in the front-rear direction in the left-right direction. 【0015】 As shown in Figure 1, the shape of the pair of left and right side member sections 18, viewed from above, from the center to the front end in the front-rear direction, is gently curved outward in the vehicle width direction as it moves towards the front. As shown in Figure 2, the front-rear intermediate section of the pair of left and right side member sections 18 includes an upper intermediate member section 26 extending in the front-rear direction and a lower intermediate member section 28 extending in the front-rear direction below the upper intermediate member section 26. An opening 30 is formed between the upper intermediate member section 26 and the lower intermediate member section 28, through which a drive shaft for transmitting the rotation of the motor 14 to the rear wheels can pass in the left-right direction. 【0016】 As shown in Figures 1 and 2, the front ends of a pair of left and right side member portions 18 are provided with front fixing portions 32 which are fixed to a vehicle body (not shown). Mounting member mounting holes 34 are formed in these front fixing portions 32, into which mounting members (not shown) are attached by press-fitting or the like. The mounting members attached to the mounting member mounting holes 34 are then fixed to the vehicle body, thereby fixing the front fixing portions 32 to the vehicle body. 【0017】 The rear ends of the pair of left and right side member portions 18 are provided with rear fixing portions 36, which are fixed to a vehicle body (not shown). Mounting member mounting holes 38 are formed in these rear fixing portions 36, into which mounting members (not shown) are attached by press-fitting or the like. The rear fixing portions 36 are then fixed to the vehicle body by fixing the mounting members attached to the mounting member mounting holes 38 to the vehicle body. 【0018】 As shown in Figure 1, the shape of the front cross member section 20, when viewed from above, is gently curved towards the rear as it approaches the center in the vehicle width direction. This front cross member section 20 spans between the front fixing sections 32 of a pair of left and right side member sections 18. The rear cross member section 22 spans between the rear fixing sections 36 of a pair of left and right side member sections 18. Furthermore, as shown in Figures 1 and 2, the intermediate cross member section 24 spans between the rear ends of the lower intermediate member sections 28 of a pair of left and right side member sections 18. 【0019】 As shown in FIGS. 2, 3, and 4, on the rear end side of the upper intermediate member portion 26 of the pair of left and right side member portions 18, a motor mount mounting hole 40 as a mounting hole penetrating in the vehicle width direction is formed. A bush 42 that forms part of the motor mount 16 is press-fitted and attached to the motor mount mounting hole 40 from the outside in the vehicle width direction. A motor mount main body 44 that forms another part of the motor mount 16 is fixed to the bush 42. The motor 14 disposed between the pair of left and right side member portions 18 is supported by the suspension member 12 via the motor mount main body 44 and the bush 42. 【0020】 As shown in FIG. 3, the portion where the motor mount mounting hole 40 is formed on the rear end side of the upper intermediate member portion 26 includes an outer wall portion 46 extending in the front-rear direction with the vehicle width direction as the thickness direction, an inner wall portion 48 extending in the front-rear direction with the vehicle width direction as the thickness direction on the inner side in the vehicle width direction with respect to the outer wall portion 46, and a connecting portion 50 connecting the outer wall portion 46 and the inner wall portion 48 in the vehicle width direction. The motor mount mounting hole 40 is formed so as to penetrate the outer wall portion 46, the connecting portion 50, and the inner wall portion 48 in the left-right direction. The shape of the motor mount mounting hole 40 when viewed from the outside or the inside in the vehicle width direction is formed in a circular shape. Further, the inner peripheral surface of the motor mount mounting hole 40 is in the shape of a cylindrical surface. 【0021】 On the lower part of the peripheral edge of the motor mount mounting hole 40 in the inner wall portion 48, a step 52 having a height difference in the vehicle width direction is formed. Also, on the front side of the peripheral edge of the motor mount mounting hole 40 sandwiching the step 52, it is a front side flat portion 54 as a flat surface portion whose surface is oriented in a direction orthogonal to the direction in which the bush 42 is press-fitted into the motor mount mounting hole 40 (hereinafter referred to as the "press-fitting direction"). The shape of the front side flat portion 54 as viewed from the inner side in the vehicle width direction is formed in a C shape along the peripheral edge of the motor mount mounting hole 40. Also, on the rear side of the peripheral edge of the motor mount mounting hole 40 sandwiching the step 52, it is a rear side flat portion 56 as a flat surface portion whose surface is oriented in a direction orthogonal to the press-fitting direction. The shape of the rear side flat portion 56 as viewed from the inner side in the vehicle width direction is formed in a C shape along the peripheral edge of the motor mount mounting hole 40. The front side flat portion 54 and the rear side flat portion 56 described above are formed by machining the inner wall portion 48. Also, the front side flat portion 54 is offset outward in the vehicle width direction with respect to the rear side flat portion 56. Furthermore, the front side flat portion 54 and the rear side flat portion 56 are surfaces that extend parallel to each other. The angle formed by the front side flat portion 54 and the rear side flat portion 56 and the press-fitting direction is set to 90°. 【0022】 As shown in FIGS. 3 and 4, in the present embodiment described above, even in a configuration where a step 52 is formed at the peripheral edge of the motor mount mounting hole 40, by bringing a jig or the like into contact with the front side flat portion 54 and the rear side flat portion 56 formed at the peripheral edge of the motor mount mounting hole 40, it is possible to receive the load when press-fitting the bush 42 into the motor mount mounting hole 40. Thereby, the bush 42 can be press-fitted into the suspension member 12 in a stable posture. Note that the angle formed by the front side flat portion 54 and the rear side flat portion 56 and the press-fitting direction is not limited to 90°. The angle formed by the front side flat portion 54 and the rear side flat portion 56 and the press-fitting direction may be set to an angle around 90° within a range that does not affect the press-fitting of the bush 42 into the motor mount mounting hole 40. 【0023】 Furthermore, in this embodiment, the shape of the front flat portion 54 and the shape of the rear flat portion 56, as viewed from the inside in the vehicle width direction, are formed in a C-shape along the periphery of the motor mount mounting hole 40. In this configuration, compared to a configuration in which the shape of the front flat portion 54 and the shape of the rear flat portion 56 are not formed in a C-shape along the periphery of the motor mount mounting hole 40, it is possible to suppress an increase in the area of ​​the front flat portion 54 and the rear flat portion 56. As a result, it is possible to suppress an increase in the processing time when forming the shape of the front flat portion 54 and the rear flat portion 56 by machining. 【0024】 In this embodiment, an example was described in which the shape of the front flat portion 54 and the rear flat portion 56, as viewed from the inside in the vehicle width direction, are formed in a C-shape along the periphery of the motor mount mounting hole 40. However, the present invention is not limited to this. The shape of the front flat portion 54 and the rear flat portion 56, as viewed from the inside in the vehicle width direction, may be set appropriately considering the shape of the inner wall portion 48 of the side member portion 18, etc. 【0025】 Although one embodiment of the present invention has been described above, it goes without saying that the present invention is not limited to the above, and can be implemented in various other ways without departing from the spirit of the invention. [Explanation of Symbols] 【0026】 12 Suspension Member 14 motors 16 Motor Mount 18 Side Member Section 40 Motor mount mounting holes (mounting holes) 52 steps 54 Front plane part (plane part) 56 Rear plane part (plane part)

Claims

[Claim 1] A suspension member having a pair of side member portions extending in the vehicle's longitudinal direction on both sides in the vehicle's width direction, and mounting holes formed in each of the pair of side member portions and penetrating in the vehicle's width direction, A motor mount is attached to the suspension member in a state where it is press-fitted into the mounting hole from the outside in the vehicle width direction, and supports the motor. Equipped with, A step is formed on the periphery of the mounting hole in the inner portion of the side member in the vehicle width direction, with a difference in height in the vehicle width direction. A suspension member structure is provided in which, on both sides of the step at the periphery of the mounting hole, flat surfaces are provided, each with a surface oriented perpendicular to the direction in which the motor mount is press-fitted into the mounting hole. [Claim 2] Viewed from the inside in the width direction of the vehicle, The flat portion formed on one side of the step at the periphery of the mounting hole is formed in a C-shape along the periphery of the mounting hole. The suspension member structure according to claim 1, wherein the flat portion formed on the other side of the step at the periphery of the mounting hole is formed in a C-shape along the periphery of the mounting hole.

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