Suspension member

Abstract

To obtain a suspension member that can prevent cracking during press-fitting of the resin outer cylinder member. [Solution] The suspension member 10 includes a cylindrical mount attachment portion 36 fixed to the vehicle body, a rib 37 provided on the outer peripheral surface 36A of the mount attachment portion 36 along the circumferential direction, and a recess 39 formed on the inner peripheral surface of the mount attachment portion 36 along the circumferential direction and within the range of the width D of the rib 37 in the axial direction.

Description

Technical Field

[0001] The present invention relates to a suspension member.

Background Art

[0002] The following Patent Document 1 discloses a configuration of a suspension member for mounting a motor. Conventionally, it is known to use a body mount to support the suspension member on the vehicle body. The body mount is also called a rubber bush and includes an inner cylinder, an outer cylinder, and an elastic body interposed between the inner cylinder and the outer cylinder. By this elastic body, vibrations accompanying the vertical movement of the suspension member with respect to the vehicle body are absorbed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] On the other hand, when adopting a resin outer cylinder member in order to reduce the number of parts in the body mount, the resin outer cylinder member has a large dimensional change due to temperature, and it is necessary to set a large interference fit in order to ensure the pull-out force. However, if the interference fit is set too large, the resin outer cylinder member may crack when it is press-fitted into the mounting portion.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide a suspension member capable of preventing cracking during press-fitting of a resin outer cylinder member.

Means for Solving the Problems

[0006] The suspension member according to claim 1 comprises a cylindrical mount attachment portion fixed to a vehicle body, a rib provided on the outer circumferential surface of the mount attachment portion along the circumferential direction, and a recess formed on the inner circumferential surface of the mount attachment portion along the circumferential direction and within the range of the width of the rib in the axial direction.

[0007] In the suspension member according to claim 1, a rib is provided on the outer circumferential surface of the mount attachment portion, and a recess is formed within the width range of the rib in the axial direction. This suppresses a decrease in the radial thickness of the mount attachment portion, thereby ensuring the rigidity of the mount attachment portion while the recess assists the release force of the resin outer cylinder member, which has a protrusion formed on its outer circumference. This suppresses an increase in the tightening allowance, thus preventing cracking of the resin outer cylinder member during press-fitting.

[0008] The suspension member according to claim 2 of the present invention, in the configuration described in claim 1, wherein the mounting portion has a convex curved surface at the corner of the inner surface on one end side into which the resin outer cylinder member is press-fitted.

[0009] In the suspension member according to claim 2, the inner surface corner on one end into which the resin outer cylinder member is press-fitted is formed by a convex curved surface, so that when the resin outer cylinder member, which has a convex portion formed on its outer circumference, is press-fitted, it is possible to prevent the convex portion from cracking at the corner.

[0010] The suspension member according to claim 3, in the configuration described in claim 1 or claim 2, wherein the angle within the recess between the first surface opposite to the end into which the resin outer cylinder member is press-fitted and the inner surface of the mount attachment portion is 15 degrees or more and 30 degrees or less.

[0011] In the suspension member according to claim 3, the angle within the recess between the first surface opposite to the end into which the resin outer cylinder member is press-fitted and the inner surface of the mount attachment portion is set to 15 degrees or more and 30 degrees or less. This prevents the protrusion formed on the outer circumference of the resin outer cylinder member from cracking when it passes through the recess.

[0012] The suspension member according to claim 4, in the configuration described in any one of claims 1 to 3, wherein the angle outside the recess between the second surface on one end where the resin outer cylinder member is press-fitted and the inner surface of the mount attachment portion is 80 degrees or more and 100 degrees or less.

[0013] In the suspension member according to claim 4, the angle between the second surface on one end into which the resin outer cylinder member is press-fitted and the inner surface of the mount attachment portion, outside the recess, is set to 80 degrees or more and 100 degrees or less. This prevents the protrusion formed on the outer circumference of the resin outer cylinder member from coming out of the recess.

[0014] The suspension member according to claim 5, in the configuration described in any one of claims 1 to 4, wherein the recess is formed such that the radial thickness of the mount attachment portion in the recess is substantially the same as the radial thickness of the mount attachment portion outside the recess.

[0015] In the suspension member according to claim 5, the radial thickness of the mounting portion can be kept constant, thereby maintaining the rigidity of the mounting portion. [Effects of the Invention]

[0016] As described above, the suspension member according to the present invention can prevent cracking of the resin outer cylinder member during press-fitting. [Brief explanation of the drawing]

[0017] [Figure 1] This is a schematic plan view showing a suspension member and the like according to one embodiment of the present invention. [Figure 2] It is a side view schematically showing a suspension member or the like according to an embodiment of the present invention. [Figure 3] It is a perspective view schematically showing an example of a structure including a main part of a suspension member according to an embodiment of the present invention. [Figure 4] It is a longitudinal sectional view taken along line IV-IV of FIG. 3. [Figure 5] It is a longitudinal sectional view showing a part of a mount attachment portion of a suspension member.

Mode for Carrying Out the Invention

[0018] Hereinafter, with reference to FIGS. 1 to 5, a suspension member 10 according to an embodiment of the present invention will be described. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted. In each figure, an arrow FR appropriately shown indicates the front side in the vehicle longitudinal direction, and an arrow UP indicates the upper side in the vehicle vertical direction. Also, an arrow LH indicates the left side in the vehicle width direction (left-right direction), and an arrow RH indicates the right side in the vehicle width direction (left-right direction). Hereinafter, when simply describing the front-back, up-down, and left-right directions, unless otherwise specified, it shall indicate the front-back in the vehicle longitudinal direction, the up-down in the vehicle vertical direction, and the left-right in the vehicle left-right direction (vehicle width direction).

[0019] As shown in FIGS. 1 and 2, the suspension member 10 of the present embodiment is provided, as an example, at the rear part of the vehicle 12. Various arms and the like (not shown) for supporting the left and right rear wheels are attached to the suspension member 10. In FIGS. 1 and 2, the illustration of the portion of the suspension member 10 to which various arms are attached is omitted. Further, a motor 14 is supported on the suspension member 10 via a motor mount 16 in order to drive the left and right rear wheels. The motor mount 16 is attached to a motor mount attachment hole 40 (see FIG. 2) penetrating in the vehicle width direction formed in an upper intermediate member portion 26 described later.

[0020] The suspension member 10 is formed, for example, by die-casting aluminum or the like, and has a configuration in which each part described later is integrally formed. This suspension member 10 includes, for example, a pair of left and right side member parts 18 extending in the front-rear direction on both sides in the vehicle width direction, a front cross member part 20 and a rear cross member part 22 connecting the front end parts and the rear end parts of the pair of left and right side member parts 18 in the left-right direction, respectively, and an intermediate cross member part 24 connecting the intermediate parts in the front-rear direction of the pair of left and right side member parts 18 in the left-right direction.

[0021] As shown in FIG. 1, the range from the central part to the front end part in the front-rear direction of the pair of left and right side member parts 18 has a shape that gently curves outward in the vehicle width direction as it goes forward in a top view. Also, as shown in FIG. 2, the intermediate part in the front-rear direction of the pair of left and right side member parts 18 includes an upper intermediate member part 26 extending in the front-rear direction and a lower intermediate member part 28 extending in the front-rear direction below the upper intermediate member part 26. An opening 30 through which a drive shaft for transmitting the rotation of the motor 14 to the rear wheels is inserted in the left-right direction is formed between the upper intermediate member part 26 and the lower intermediate member part 28.

[0022] As shown in FIGS. 1 and 2, a front side mount attachment part 32 as a cylindrical mount attachment part fixed to the vehicle body 11 (see FIG. 4) is provided at the front end parts of the pair of left and right side member parts 18. A front side mount attachment hole 34 to which a body mount part 50 (see FIGS. 3 and 4) described later is attached by press-fitting is formed in the front side mount attachment part 32. And by fixing the body mount part 50 attached to the front side mount attachment hole 34 to the vehicle body 11 (see FIG. 4), the front side mount attachment part 32 is configured to be fixed to the vehicle body 11.

[0023] Furthermore, the rear ends of the pair of left and right side member portions 18 are provided with rear mount mounting portions 36, which are cylindrical mount mounting portions fixed to the vehicle body (not shown). These rear mount mounting portions 36 have rear mount mounting holes 38 into which a body mount portion 50 (see Figures 3 and 4), described later, is attached by press-fitting. The body mount portion 50 attached to the rear mount mounting hole 38 is then fixed to the vehicle body 11 (see Figure 4), thereby fixing the rear mount mounting portion 36 to the vehicle body 11.

[0024] As shown in Figure 1, the front cross member portion 20, for example, has a shape that curves gently towards the rear as it approaches the center in the vehicle width direction when viewed from above, and spans between the front mounting attachment portions 32 of a pair of left and right side member portions 18. The rear cross member portion 22, for example, spans between the rear mounting attachment portions 36 of a pair of left and right side member portions 18. Furthermore, as shown in Figures 1 and 2, the intermediate cross member portion 24 spans between the rear ends of the lower intermediate member portions 28 of a pair of left and right side member portions 18.

[0025] Here, the front mount mounting portion 32 and the rear mount mounting portion 36, which serve as the mounting attachment points, will be described in detail. In this embodiment, the rear mount mounting portion 36 will be described below, but the configuration of the rear mount mounting portion 36 can also be applied to the front mount mounting portion 32.

[0026] As shown in Figures 3 and 4, the rear mount mounting portion 36 of this embodiment is connected to the rear cross member portion 22 and the side member portion 18, and is formed in a cylindrical shape having a rear mount mounting hole 38 inside. The body mount portion 50 (see Figures 3 and 4), which will be described later, is press-fitted into the rear mount mounting hole 38 from below in the vertical direction, as indicated by arrow P in Figure 5, and is supported.

[0027] As shown in Figures 4 and 5, the rear mount attachment portion 36 is provided with a rib 37 on its outer peripheral surface 36A that runs circumferentially. The rib 37 protrudes outward and has a substantially rectangular cross-section. The rib 37 has a width D in the vertical direction, i.e., the axial direction.

[0028] Furthermore, the rear mount attachment portion 36 is provided with a recess 39 formed along the circumferential direction on its inner circumferential surface, i.e., the rear mount attachment hole 38. As shown in Figure 5, the recess 39 is formed in the vertical direction, i.e., the axial direction, within the width D of the rib 37. The recess 39 comprises an upper surface 39A, a lower surface 39B facing the upper surface 39A, and a bottom surface 39C that connects the upper surface 39A and the lower surface 39B and extends in the vertical direction.

[0029] In this embodiment, as an example, the recess 39 is formed such that the radial thickness T1 of the rear mount attachment portion 36 in the recess 39 is approximately the same as the radial thickness T2 of the rear mount attachment portion 36 outside the recess 39. Here, "approximately the same thickness" includes not only those with exactly the same numerical value, but also those with slightly different numerical values ​​within the range of manufacturing tolerances, etc.

[0030] Furthermore, as shown in Figure 5, the recess 39 has an angle R1 within the recess 39 between the upper surface (first surface) 39A on the opposite side of the end (i.e., the lower side) into which the body mount portion 50 (see Figures 3 and 4) described later is press-fitted, and the inner surface of the rear mount mounting portion 36, i.e., the inner circumferential surface of the rear mount mounting hole 38, which is, for example, 15 degrees or more and 30 degrees or less. In addition, the recess 39 has an angle R2 outside the recess 39 between the lower surface (second surface) 39B on the end (i.e., the lower side) into which the body mount portion 50 (see Figures 3 and 4) described later is press-fitted, and the inner surface of the rear mount mounting portion 36, i.e., the inner circumferential surface of the rear mount mounting hole 38, which is, for example, 80 degrees or more and 100 degrees or less.

[0031] Furthermore, the rear mount attachment portion 36 has a convex curved surface at one end, i.e., the lower inner surface corner 36B, into which the body mount portion 50 (see Figures 3 and 4), described later, is press-fitted. In other words, the corner 36B has an R shape, for example.

[0032] In this embodiment, as an example, the front mount mounting portion 32 and the rear mount mounting portion 36 are included in the suspension member 10 and are integrally formed with a pair of left and right side member portions 18, a front cross member portion 20 and a rear cross member portion 22, and an intermediate cross member portion 24 using aluminum die casting or the like. Therefore, in this embodiment, the press-fit inner diameter and cast surface 60 are formed so that the corner portion 36B has an R shape. In this embodiment, as an example, the front mount mounting hole 34 and the rear mount mounting hole 38, and the recess 39 are formed by machining the cast surface 60 as shown by the shading in Figure 5.

[0033] Next, the body mount portion 50 will be described. The body mount portion 50 is a support component that supports the suspension member 10 to the vehicle body 11, and as an example, four of them are provided on the vehicle. The body mount portion 50 also functions as a vibration damping component that suppresses the transmission of vibrations from the suspension member 10 to the vehicle body 11. As shown in Figures 3 and 4, the body mount portion 50 comprises an inner cylinder 52 and a resin outer cylinder member 54 made of resin. The inner cylinder 52 extends in the vertical direction, that is, along the axial direction. As an example, the inner cylinder 52 is fastened and fixed to the vehicle body 11 via bolts 56 and stud nuts 13.

[0034] The resin outer cylinder member 54 is formed of a heat-resistant resin, for example, and is coaxial with the inner cylinder 52. The outer circumferential surface of the inner cylinder 52 and the inner circumferential surface of the resin outer cylinder member 54 have a predetermined gap in the radial direction. The resin outer cylinder member 54 has a flange portion 54A that extends radially outward at its lower end. The upper surface of this flange portion 54A abuts against the lower end surface of the front mount mounting portion 32 and the lower end surface of the rear mount mounting portion 36 when the body mount portion 50 is press-fitted into the front mount mounting hole 34 and the rear mount mounting hole 38.

[0035] Furthermore, the resin outer cylinder member 54 is provided with a protrusion 54B on its outer circumferential surface, which is provided along the circumferential direction. The protrusion 54B is formed at a position corresponding to the recess 39 of the front mounting portion 32 and the rear mounting portion 36 described above, and is fitted into the recess 39. In this embodiment, as an example, the protrusion 54B is formed with a substantially rectangular cross-section.

[0036] As described above, the body mount portion 50 is press-fitted into the front mount mounting hole 34 and the rear mount mounting hole 38, thereby joining (fixing) the resin outer cylinder member 54 to the front mount mounting portion 32 and the rear mount mounting portion 36, respectively.

[0037] (Mechanism of Action and Effects) Next, the effects and advantages of this embodiment will be described.

[0038] In the body mount section, when using a resin outer cylinder member to reduce the number of parts, the resin outer cylinder member undergoes significant dimensional changes due to temperature, requiring a large clamping allowance to ensure proper release force. However, if the clamping allowance is set too large, the resin outer cylinder member may crack when pressed into the mount attachment section.

[0039] Therefore, in the suspension member 10 according to this embodiment, ribs 37 are provided along the circumferential direction on the outer circumferential surface of the mount mounting portion, i.e., the front mount mounting portion 32 and the rear mount mounting portion 36, and recesses 39 are formed within the width D of the ribs 37 in the vertical direction, i.e., the axial direction. This suppresses a decrease in the radial thickness of the mount mounting portion, i.e., the front mount mounting portion 32 and the rear mount mounting portion 36, thereby ensuring the rigidity of the front mount mounting portion 32 and the rear mount mounting portion 36, while the recesses 39 assist the release force of the resin outer cylinder member 54, which has protrusions 54B formed on its outer circumference. This suppresses an increase in the tightening allowance, thus preventing cracking of the resin outer cylinder member during press-fitting.

[0040] Furthermore, in the suspension member 10 according to this embodiment, the inner corner portion 36B on one end (lower side) into which the resin outer cylinder member 54 is press-fitted is formed by a convex curved surface. This prevents the convex portion 54B from cracking at the corner portion 36B when the resin outer cylinder member 54, which has a convex portion 54B formed on its outer circumference, is press-fitted.

[0041] Furthermore, in the suspension member 10 according to this embodiment, the angle R1 in the recess 39 between the upper surface (first surface) 39A opposite to the end side (lower side) into which the resin outer cylinder member 54 is press-fitted, and the inner surface of the rear mount mounting portion 36, i.e., the inner circumferential surface of the rear mount mounting hole 38, is formed to be between 15 degrees and 30 degrees, for example. Therefore, when the protrusion 54B formed on the outer circumference of the resin outer cylinder member 54 passes through the recess 39, it is possible to prevent the protrusion 54B from cracking.

[0042] Furthermore, in the suspension member 10 according to this embodiment, the angle R2 outside the recess 39 between the lower surface (second surface) 39B of one end (lower side) into which the resin outer cylinder member 54 is press-fitted, and the inner surface of the rear mount mounting portion 36, i.e., the inner circumferential surface of the rear mount mounting hole 38, is formed to be 80 degrees or more and 100 degrees or less, for example. Therefore, it is possible to suppress the protrusion 54B formed on the outer circumference of the resin outer cylinder member 54 from coming out of the recess 39 downward.

[0043] Furthermore, in the suspension member 10 according to this embodiment, the radial thickness of the mounting portion, i.e., the front mounting portion 32 and the rear mounting portion 36, can be kept constant, thereby maintaining the rigidity of the mounting portion, i.e., the front mounting portion 32 and the rear mounting portion 36.

[0044] [supplementary explanation] In the embodiments described above, the ribs 37 have a substantially rectangular cross-section, but the shape of the ribs 37 is not limited to a substantially rectangular shape. Also, in the embodiments described above, the ribs 37 are provided along the circumferential direction, i.e., continuously, but the present invention is not limited to this. For example, they may be provided intermittently. Even when provided intermittently, the rigidity can be increased compared to an embodiment in which the ribs 37 are not provided.

[0045] Furthermore, in the embodiment described above, the radial thickness T1 of the rear mount mounting portion 36 in the recess 39 is formed to be approximately the same as the radial thickness T2 of the rear mount mounting portion 36 outside the recess 39, but the present invention is not limited thereto. For example, the radial thickness T1 of the rear mount mounting portion 36 in the recess 39 may be formed to be thicker or thinner than the radial thickness T2 of the rear mount mounting portion 36 outside the recess 39. However, from the viewpoint of rigidity, it is preferable to be formed to be thicker than thinner.

[0046] Furthermore, the configuration of the present invention is not limited to the above-described embodiments, and the configuration can be modified as appropriate, as long as the problem can be solved. [Explanation of Symbols]

[0047] 10 Suspension Member 11 Car body 32 Front mount attachment section (mount attachment section) 36 Rear mount attachment section (mount attachment section) 36A Outer surface 37 Ribs 36B Corner 39 Recess 39A Top surface (first surface) 39B Bottom surface (second surface) 54 Resin outer cylinder member D width Radial wall thickness of the mounting portion in the T1 recess Radial wall thickness of the mounting portion other than the T2 recess

Claims

1. A cylindrical mounting part that is fixed to the vehicle body, The outer circumferential surface of the mounting portion is provided with ribs along the circumferential direction, A suspension member comprising a recess formed along the circumferential direction on the inner circumferential surface of the mounting portion, and formed within the range of the width of the rib in the axial direction.

2. The suspension member according to claim 1, wherein the mounting portion has a corner on the inner surface of one end into which the resin outer cylinder member is press-fitted, and the corner is formed by a convex curved surface.

3. The suspension member according to claim 1, wherein the angle within the recess between the first surface opposite to the end into which the resin outer cylinder member is press-fitted and the inner surface of the mount attachment portion is 15 degrees or more and 30 degrees or less.

4. The suspension member according to claim 1, wherein the angle outside the recess between the second surface on one end where the resin outer cylinder member is press-fitted and the inner surface of the mount attachment portion is 80 degrees or more and 100 degrees or less.

5. The suspension member according to claim 1, wherein the radial thickness of the mounting portion in the recess is formed to be substantially the same as the radial thickness of the mounting portion outside the recess.

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