JP2000071734A - Vehicle suspension support structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure good shock absorbing performance of a vehicle frame by providing, in a suspension arm support of a suspension cross member, a fragile portion that is made weaker than other portions in the circumferential direction of a support bushing installed in the suspension arm and causing this weak part to fracture during collisions, particularly in frontal crashes, to allow the suspension cross member to separate from the vehicle frame. SOLUTION: This vehicle suspension support structure is built by fixing one end of a suspension arm 8 together with a suspension cross member 3 in a direction perpendicular to a vehicle frame member. A fragile portion 26b that is made weaker than other portions in the circumferential direction of a support bushing 7 installed in the suspension arm 8 is provided in a suspension arm support 5 of the suspension cross member 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension for a vehicle such as a MacPherson strut front suspension in which one end of a suspension arm is fixedly fastened together with a suspension cross member to a body member (for example, a front side frame) in a vertical direction. Regarding the support structure.

[0002]

2. Description of the Related Art Conventionally, as a vehicle suspension supporting structure of the above-mentioned example, there is a structure described in, for example, European Patent Registration No. 265675.

That is, as shown in FIG. 7, a suspension cross member 71 and a suspension arm 72 are provided, and a support bush provided at one end 72a of the suspension arm 72 is positioned on a C-shaped guide portion of the suspension cross member 71. The other end 7 of the suspension arm 72
The support bush provided on 2b is attached to the support portion 74 using a bolt 73, and the suspension arm 72 is temporarily held on the suspension cross member 71. Then, the one end 72a of the suspension arm 72 is joined together with the suspension cross member 71. This is a support structure for a front suspension that is configured to be fastened and fixed together by using bolts that are directed vertically to a vehicle body member. In the drawings, F indicates the front side of the vehicle, and R indicates the rear side of the vehicle.

According to this conventional configuration, both the suspension arm 72 and the suspension arm 72 can be attached to the vehicle body member while the suspension arm 72 is temporarily held on the suspension cross member 71, so that the ease of mounting the suspension is improved. On the other hand, the suspension (including both the suspension cross member 71 and the suspension arm 72) attached to the vehicle body has a structure that cannot be separated from the vehicle body in the event of a collision. At times, there were the following problems.

That is, since the suspension is mounted on the vehicle body, a favorable crash of the vehicle body (frame) at the time of a collision of the vehicle is impeded, and it is difficult to sufficiently improve the shock absorbing performance. There was a point.

[0006]

According to the first aspect of the present invention, a suspension arm supporting portion of a suspension cross member includes:
By providing a fragile portion formed in the circumferential direction of the support bush provided on the suspension arm more fragile than other parts, the fragile portion is broken at the time of a vehicle collision, particularly at the time of a frontal collision, and the suspension cross member is removed from the vehicle body. It is an object of the present invention to provide a suspension support structure for a vehicle that can be separated and that can ensure good shock absorption of a vehicle body (frame).

According to a second aspect of the present invention, in addition to the object of the first aspect of the present invention, the width of the support bush in the circumferential direction in the circumferential direction is made smaller than other portions. By forming the fragile part, the formation of the fragile part is easier than the structure that forms the fragile part by changing the wall thickness, and the suspension cross member is more reliably secured with the fragile part narrower than other parts It is an object of the present invention to provide a vehicle suspension support structure that can be separated from a vehicle body and can further improve shock absorption performance.

According to a third aspect of the present invention, in addition to the object of the first or second aspect of the present invention, a weak portion is provided on the upper support portion of the suspension arm support portion at the front side thereof, and the suspension arm support portion is provided with a weak portion. By providing a fragile portion on the rear side of the lower support portion, the fragile portion can be set at a portion that receives a load at the time of a collision, and the fragile portion can be more reliably broken at the time of a collision, and the suspension cross member It is an object of the present invention to provide a vehicle suspension support structure capable of reliably separating a vehicle from a vehicle body.

According to a fourth aspect of the present invention, in addition to the object of the first or second aspect, the upper support portion of the suspension arm support portion receives a load generated by a relative movement with respect to the vehicle body. The vehicle body and the suspension cross member (suspension arm support) in the event of a collision are provided by providing a fragile part in the part and providing a fragile part in the lower support part of the suspension arm support part to receive the load generated by the relative movement with the suspension arm. Fragile part of the upper support part is broken by the load at the time of relative movement with the lower support part by the load at the time of relative movement between the suspension arm and the suspension cross member (including the suspension arm support part). To provide a suspension support structure for a vehicle that can reliably separate the suspension cross member from the vehicle body.

[0010]

According to a first aspect of the present invention, there is provided a suspension support structure for a vehicle in which one end of a suspension arm and a suspension cross member are jointly fastened to a body member in a vertical direction, The suspension arm supporting portion of the suspension cross member has a vehicle suspension support structure in which a fragile portion formed more fragile than other portions in a circumferential direction of a support bush provided on the suspension arm is provided. .

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the weak portion is formed such that a width of the support bush in the horizontal direction in the circumferential direction is smaller than other portions. A vehicle suspension support structure.

According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the suspension arm support portion includes an upper support portion and a lower support portion. Is a suspension support structure for a vehicle in which the weak portion is provided on the front side in the vehicle body front-rear direction and the weak portion is provided on the lower support portion on the rear side in the vehicle front-rear direction.

According to a fourth aspect of the present invention, in addition to the structure of the first or second aspect, the suspension arm support portion includes an upper support portion and a lower support portion. The above-mentioned fragile portion is provided in a portion which receives a load generated by relative movement with the vehicle body, and the above-mentioned fragile portion is provided in a portion of the lower support portion which receives a load generated by relative movement with the suspension arm. It is a suspension support structure for a vehicle.

[0014]

According to the first aspect of the present invention, since the suspension arm supporting portion of the suspension cross member is provided with a fragile portion which is formed more fragile than other portions. At the time of a vehicle collision, especially at the time of a head-on collision, the above-mentioned fragile portion is broken.

As a result, since the suspension cross member is separated from the vehicle body, there is an effect that good shock absorption of the vehicle body (frame) can be secured.

According to the invention described in claim 2 of the present invention,
In addition to the effect of the first aspect of the present invention, since the width of the above-described fragile portion in the horizontal direction in the circumferential direction of the support bush is formed smaller than other portions, the fragile portion is formed by changing the thickness. As compared with the structure, the fragile portion can be easily formed, and the suspension cross member can be more securely separated from the vehicle body with the fragile portion smaller than other portions, further improving the shock absorbing performance. There is an effect that can be.

According to the third aspect of the present invention,
In addition to the effect of the invention of claim 1 or 2, the upper support of the suspension arm support is provided with a fragile portion on the front side in the vehicle front-rear direction, and the lower support of the suspension arm support is provided on the rear support in the vehicle front-rear direction. Since the fragile portion is provided on the side, the fragile portion can be set in conformity with the portion that receives the load generated by the relative movement at the time of the collision.

Therefore, there is an effect that the fragile portion can be more reliably broken at the time of collision, the suspension cross member can be more reliably separated from the vehicle body, and the shock absorbing performance can be further improved.

According to the invention described in claim 4 of the present invention,
In addition to the effect of the first or second aspect of the invention, the upper support of the suspension arm support is provided with a fragile portion at a portion that receives a load generated by relative movement with the vehicle body. The lower support portion is provided with a fragile portion at a portion receiving a load generated by relative movement with the suspension arm, so that the vehicle body and the suspension cross member (including the suspension arm support portion at the time of a vehicle collision, particularly at the time of a frontal collision) ), The fragile portion of the upper support portion is broken by the load due to the relative movement, and the fragile portion of the lower support portion is broken by the load due to the relative movement of the suspension arm and the suspension cross member (including the suspension arm support portion). You.

As a result, there is an effect that the suspension cross member can be more reliably separated from the vehicle body and sufficient shock absorption can be secured.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. The drawing shows the suspension support structure of the vehicle,
1 and 2, the McPherson strut front suspension includes a first suspension cross member 1.
And the second suspension cross member 2 constitute a suspension cross member 3 extending in the vehicle width direction, and support bushes 6, 7 are provided on suspension arm support portions 4, 5 set at the front and rear ends of the suspension cross member 3, respectively. The suspension arm 8 is attached via the. In the drawings, only the configuration corresponding to the right front wheel 9 is shown, but the configuration corresponding to the left front wheel is formed symmetrically with this.

The support bush 6 on the front side of the suspension arm 8 is attached to the suspension arm support 4 on the same side by using a bolt 10 oriented substantially in the front-rear direction of the vehicle body. The bush 7 is configured to be fastened to the front side frame 12 as a vehicle body member together with the suspension arm support portion 5 and each of the elements 3 and 8 by using a bolt 11 oriented vertically.

The distal end of the suspension arm 8 is connected to the lower part of the knuckle 13, and a shock absorber 15, a coil spring 16 and the like are provided between the upper part of the knuckle 13 and the body 14 (specifically, a suspension tower). The strut damper 17 is stretched.

The above-described coil spring 16 is stretched between the upper seat 18 and the lower seat 19, and bolts a bracket 20 provided at a lower portion of the shock absorber 15 to an upper portion of the knuckle 13.

On the other hand, a stabilizer 21 that suppresses the roll angle at the time of rebound and a bump of only one wheel due to the resistance of torsional rigidity is arranged in parallel with the suspension cross member 3, and is provided at the end of the stabilizer 21 and the strut damper 17. The control link 23 is connected to the bracket 22.

Further, a protruding portion 24 protruding upward from the member 2 is integrally joined to a position of the second suspension cross member 2 adjacent to the suspension arm support portion 4, and a mounting portion at the tip of the protruding portion 24 is provided. 25 is configured to be bolted up to another portion 12 a of the front side frame 12.

As shown in FIGS. 3 and 4, the suspension arm support 5 has an upper support 26 and a lower support 27. The support arms 26, 27 are opened at the side where the suspension arm 8 is mounted. On the mounting side, the joining flange portions 26a and 27a are joined to each other so as to have a U-shaped cross section.

Here, the lower support portion 27 is formed in a divided structure of the lower support portion 27 and the lower bracket 28. The lower bracket 28 is attached to the three weld nuts 29 using the same number of bolts 30. For this reason, as shown in FIG. 5, a total of three bolt insertion holes 31, 32, and 33 are formed in the lower bracket 28 corresponding to the welding locations of the nuts 29, and the plurality of bolt insertion holes 31 to 33 are provided. At least one of the bolt insertion holes 33 is formed in a long hole shape.

As shown in FIG. 4, the support bush 7 includes an inner pipe 34 and a rubber bush 35.
A guide member 37 as a holding portion is provided on the lower surface of the upper support portion 26 of the suspension arm support portion 5 that supports the support bush 7 and the upper surface of the raised portion of the lower bracket 28. Each is fixedly joined.

Since the upper and lower guide members 37 and 37 have the same configuration, the configuration of the guide member 37 joined and fixed to the upper surface of the lower bracket 28 will be described below with reference to FIGS.

The guide member 37 fixed to the lower bracket 28 around the bolt insertion hole 38 through which the bolt 11 is inserted is connected to the inner pipe 3 of the support bush 7.
4 penetrates and has a through hole 39 so as to regulate the position of substantially the entire circumference thereof.
It is configured to contact the outer periphery to regulate the position of the support bush 7. In this embodiment, as is apparent from FIG. 5, the above-described through hole 39 has a hole edge in the vehicle width direction.
The hole shape is set so that the position regulation with respect to the vehicle body front-rear direction (vertical direction shown in the figure) is tighter than the position regulation in the vehicle body longitudinal direction (vertical direction shown in the figure).

The above-mentioned guide member 37 has its main surface 3
7a, slant surfaces 37b, 37b extending obliquely from both sides in the vehicle width direction.
Restriction pieces 37c, 37c for restricting the position of the inner pipe 34 by bending the intermediate portion 7b in the direction of the lower bracket 28 are integrally formed.

Here, the aforementioned slant surfaces 37b, 37b
Is a support bush 7 for the purpose of improving workability during temporary holding.
Are guide pieces for guiding the inner pipe 34 to the through hole 39. 2, 3, and 5, F indicates the front side of the vehicle, and R indicates the rear side of the vehicle.

As shown in FIGS. 3 and 5, the suspension arm supporting portion 5 of the suspension cross member 3 is formed more fragile than other parts in the circumferential direction of the support bush 7 provided on the suspension arm 8 as shown in FIGS. Fragile part 26b,
28b are provided.

Each of the above-mentioned fragile portions 26b and 28b is formed in a notch so that the horizontal width of the support bush 7 in the circumferential direction is smaller than other portions.

Further, the weak portion 26b formed in the upper support portion 26 is provided at a portion that receives a load generated by relative movement with respect to the vehicle body, that is, provided on the front side of the upper support portion 26 in the vehicle longitudinal direction. The fragile portion 28b formed at a position receiving a load generated by relative movement with the suspension arm 8, that is, a rear side of the lower bracket 28 in the vehicle longitudinal direction.

That is, the suspension is attached to the front side frame 12 using the bolts 11,
When a collision load is input at the time of a vehicle collision, particularly at the time of a head-on collision, the suspension cross member 3 tends to retreat, and the bolt 11 shown in FIG. 3 relatively moves in the direction of arrow B in FIG. The fragile portion 2 is provided on the front side receiving the load in the direction of arrow B.
By forming 6b, the suspension cross member 3 is separated from the vehicle body at the time of a collision.

The suspension arm 8 fixed to the vehicle body by the above-mentioned bolt 11 tends to remain at the position of the joint in the event of a collision of the vehicle, but the suspension arm 8 tends to retreat with the suspension cross member 3.
Of the supporting bush 7 is relatively moved rearward and laterally, that is, in the direction of arrow D shown in FIG. By forming the fragile portion 28b on the rear side receiving the load in the direction of the arrow D, the suspension cross member 3 is separated from the vehicle body at the time of a collision.

Therefore, in the upper support portion 26, a weak portion 26b is formed on the front side in the vehicle longitudinal direction, and in the lower bracket 28, the weak portion 28b is formed on the rear side in the vehicle longitudinal direction.
Is formed so that the fragile portions 26b and 28b are broken by the bolt 11 at the time of a vehicle collision, particularly at the time of a head-on collision, and the suspension cross member 3 (including the suspension arm support portion 5) is separated from the vehicle body. .

In the suspension support structure for a vehicle configured as described above, in order to temporarily hold the suspension arm 8 with respect to the suspension cross member 3, the suspension arm support portion 5 with the lower bracket 28 shown in FIG. Through hole 3 of guide member 37 on lower surface of upper support portion 26
9, the upper end of the inner pipe 34 of the support bush 7 is inserted, and substantially the entire circumference thereof is positioned.

Next, the inner pipe 34 of the support bush 7 is inserted into the through hole 39 of the guide member 37 on the upper surface of the lower bracket 28.
The lower bracket 38 is disposed on the lower surface of the lower support portion 27 so that the lower end is located. Thereafter, the bolt 30 is screwed into the weld nut 29 to attach the lower bracket 28 to the lower surface of the lower support portion 27. And the upper support 26
The support bush 7 is sandwiched between the lower bushing 28 and the lower bracket 28 so that no displacement occurs.

Next, when the support bush 6 (see FIG. 2) provided at the front end of the other end of the suspension arm 8 is attached to the suspension arm support portion 4 of the suspension cross member 3 with a bolt 10, the suspension cross member 3 The suspension arm 8 can be easily temporarily held.

The suspension, which has been temporarily held in this manner, is mounted on the front side frame 12 as a vehicle body member.
As shown in FIG. 4, the bolt 11 extending vertically downward from the front side frame 12 is inserted into the bolt insertion hole 40 of the upper support 26 and the guide member 3.
7, the inside of the inner pipe 34 of the support bush 7, the through hole 39 of the guide member 37, the lower bracket 28.
Of the front side frame 12 is screwed into the lower portion of the lower bracket 28 through this order, and a nut 41 is screwed into the projecting portion.
A bolt protruding from the lower surface of the mounting portion 25 (see FIG. 1) from 2a
(Not shown), the suspension (including the suspension cross member 3 and the suspension arm 8) is connected to the front side frame 12 as a vehicle body.
Can be assembled with good workability.

Moreover, since the suspension arm supporting portion 5 of the suspension cross member 3 is provided with the fragile portions 26b and 28b which are formed more fragile than other portions, the suspension is bolted together to the vehicle body by the bolt 11. When a collision load is input at the time of a vehicle collision in the suspension support structure having the above-described configuration, the above-described fragile portions 26b and 26b are moved by the relative movement of the bolt 11 (see the arrow B direction in FIG. 3 and the arrow D direction in FIG. 5). 28b is broken, and the suspension cross member 3 is separated from the vehicle body, so that the vehicle body can be allowed to crash, and good shock absorption can be ensured.

According to the vehicle suspension support structure having the above-described structure, the suspension arm support portion 5 of the suspension cross member 3 is provided with the fragile portions 26b and 28b which are formed more fragile than other portions. Therefore, at the time of an impact of the vehicle, particularly at the time of a head-on collision, the above-mentioned weak portions 26b and 28b are broken. As a result, since the suspension cross member 3 is separated from the vehicle body, there is an effect that a favorable shock absorbing property of the vehicle body (frame) can be secured.

Since the width of the support bush 7 in the horizontal direction in the circumferential direction is smaller than that of the other portions, the above-mentioned weak portions 26b and 28b are formed by changing the wall thickness or otherwise forming the weak portion. The formation of the fragile portions 26b and 28b is easier than in other structures. That is, the fragile portions 26b and 28b can be formed by the notch structure, and the suspension cross member 3 can be more reliably separated from the vehicle body by the fragile portions 26b and 28b which are smaller in width than other portions, thereby absorbing the shock. There is an effect that the performance can be further improved.

Further, the upper support portion 26 of the suspension arm support portion 5 is provided with a weak portion 26b on the front side in the front-rear direction of the single unit, and the lower support portion of the suspension arm support portion 5 (in this embodiment, the support portion 27 is divided with respect to the support portion 27). Lower bracket 2 that can be configured
8), the fragile portions 28b are provided on the rear side in the front-rear direction of the vehicle body, so that the fragile portions 26b and 28b can be set in accordance with the portions receiving the load generated by the relative movement at the time of the collision.

For this reason, the fragile parts 26b, 28b at the time of collision
Is more reliably broken, the suspension cross member 3 can be reliably separated from the vehicle body, and there is an effect that the shock absorbing performance can be further improved.

In addition, the load generated by the relative movement with respect to the vehicle body is placed on the upper support portion 26 of the suspension arm 5 described above.
(The load in the direction of arrow B shown in FIG. 3)
6b, the lower support (see the lower bracket 28) of the suspension arm support portion 5 has a fragile portion at a portion which receives a load (a load in the direction of arrow D shown in FIG. 5) generated by relative movement with the suspension arm 8. With the provision of 28b, the fragile portion 26b of the upper support portion 26 is broken by the load due to the relative movement between the vehicle body and the suspension cross member 3 (including the suspension arm support portion 5) at the time of a vehicle collision, particularly at the time of a frontal collision. , Suspension arm 8 and suspension cross member 3
The fragile portion 28b of the lower support portion (see the lower bracket 28) is broken by a load caused by relative movement with the support arm 5 (including the suspension arm support portion 5). As a result, there is an effect that the suspension cross member 3 can be more reliably separated from the vehicle body and sufficient shock absorption can be secured.

In the correspondence between the structure of the present invention and the above-described embodiment, the suspension of the present invention corresponds to the MacPherson strut type front suspension of the embodiment. , And the lower supporting portion is a lower bracket 28
However, the present invention is not limited only to the configuration of the above-described embodiment.

For example, in the above embodiment, the provisional mounting of the support bush 7 is improved and the suspension arm 8 is improved.
Although the lower bracket 28 has a split structure in consideration of the improvement in serviceability by detaching only the lower bracket, the lower bracket 28 having the split structure is not used, and the lower support portion 27 supports the lower portion of the support bush 7. If configured for
The lower support 27 may be provided with a fragile portion similar to that described above.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a vehicle suspension support structure of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is an enlarged plan view of a suspension arm support.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a plan view of a lower bracket.

FIG. 6 is a sectional view of a guide member.

FIG. 7 is an explanatory view showing a conventional vehicle suspension support structure.

[Explanation of symbols]

 3 Suspension Cross Member 5 Suspension Arm Support 7 Support Bush 8 Suspension Arm 12 Front Side Frame (Body Member) 26 Upper Support 28 Lower Bracket (Lower Support) 26b, 28b Fragile

Claims (4)

[Claims] 1. A suspension support structure for a vehicle, wherein one end of a suspension arm is fixedly fastened together with a suspension cross member to a vehicle body member in a vertical direction, wherein the suspension arm is provided on a suspension arm support portion of the suspension cross member. A suspension support structure for a vehicle provided with a fragile portion that is formed more fragile than other portions in the circumferential direction of the supporting bush. 2. A suspension support structure for a vehicle according to claim 1, wherein said weak portion is formed to have a smaller horizontal width in a circumferential direction of said support bush than other portions. 3. The suspension arm support portion includes an upper support portion and a lower support portion, the upper support portion being provided with the fragile portion on the front side in the vehicle longitudinal direction, and the lower support portion in the vehicle longitudinal direction. The suspension support structure for a vehicle according to claim 1, wherein the weak portion is provided on a rear side. 4. The suspension arm support section includes an upper support section and a lower support section, and the upper support section is provided with the fragile portion at a position to receive a load generated by a relative movement with respect to a vehicle body. 3. The suspension support structure for a vehicle according to claim 1, wherein the support portion is provided with the fragile portion at a portion that receives a load generated by relative movement with the suspension arm.