JP2004284427A - Suspension member fitting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a suspension member fitting structure capable of enhancing a vehicle deceleration characteristic in the second half of collision. <P>SOLUTION: A fitting hole 20 which is a long hole extending in the longitudinal direction of a vehicle body is formed in a rear fitting part 14 of a front suspension member 10, and a bolt 22 is passed through the fitting hole 20 from the lower side of the vehicle body. A bush fitting part 40 to support the rear end 42A of a lower arm 42 is formed on a part on the forward vehicle body side of the rear fitting part 14 in the front suspension member 10, and a suspension member inclined surface 50 which is inclined toward the rear lower side of the vehicle body from the forward upper side of the vehicle body is formed on an upper part of a rear wall 40C at the bush fitting part 40. On the other hand, a body side inclined surface 52 inclined toward the rear lower side of the vehicle body from the forward upper side of the vehicle body is formed on the part of a front side member 16 facing the suspension member inclined surface 50. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a suspension member mounting structure, and more particularly to a suspension member mounting structure in which a lower arm is mounted and mounted on a body.
[0002]
[Prior art]
Conventionally, as a suspension member mounting structure of this type, at the time of a vehicle front collision, at a rear side mounting portion to the body of the suspension member, a coupling portion with the body is cut off, and at the rear side of the vehicle body of the rear mounting portion. There is known a configuration in which a suspension member moves downward along a formed inclined portion (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-6-329045
[Problems to be solved by the invention]
However, in such a suspension member mounting structure, in the first half of the collision at the time of a vehicle front collision, the rear mounting portion of the suspension member to the body and the coupling portion between the body and the suspension member are separated. Therefore, when the suspension member interferes with the inclined portion formed on the rear side of the vehicle body of the rear side mounting portion, the rear side mounting portion of the suspension member to the body easily falls down the vehicle body. As a result, the vehicle deceleration characteristics in the latter half of the collision decrease.
[0005]
An object of the present invention is to provide a suspension member mounting structure that can improve vehicle deceleration characteristics in the latter half of a collision in consideration of the above fact.
[0006]
[Means for Solving the Problems]
The suspension member mounting structure according to the first aspect of the present invention includes a lower arm rear end support portion provided on the suspension member and supporting a lower arm rear end portion;
A mounting portion for a body having a mounting hole that is provided in a different portion from the lower arm rear end support portion of the suspension member and that is a long hole extending in the vehicle longitudinal direction;
A fastening member that is inserted through the mounting hole and supports the suspension member on the body from below the vehicle body, and when a load equal to or more than a predetermined value acts below the vehicle body, the fastening member disengages from the body.
A suspension member inclined surface formed on the vehicle body front side of the mounting portion to the body in the suspension member, and inclined from the vehicle front upper side toward the vehicle rear lower side;
A body-side inclined surface formed at a body-side portion substantially parallel to the suspension member inclined surface on the vehicle rear side,
It is characterized by having.
[0007]
Therefore, when a member in the engine room such as an engine and a transmission moves rearward of the vehicle body and interferes with the suspension member at the time of a vehicle front collision, the suspension member moves to a body having a long mounting hole extending in the vehicle front-rear direction. At the mounting portion, the vehicle horizontally moves rearward along the mounting hole while being supported from below the vehicle body by the fastening member. Thereafter, the suspension member slope formed from the upper front side of the vehicle body to the lower side of the rear body formed on the front side of the vehicle body of the mounting portion of the suspension member to the body, and the suspension member slope is substantially parallel to the rear side of the vehicle body. When the body-side inclined surface formed at the opposed body-side portion interferes, the input of the rear of the vehicle body input to the suspension member is changed from the upper front of the vehicle along the inclined surface to the input of the lower rear of the vehicle body. Change. Therefore, a load equal to or more than a predetermined value acts on the fastening member downwardly of the vehicle body, and the fastening member comes off the body, so that the suspension member further moves rearward and downward. As a result, in the latter half of the collision, the suspension member is not broken and the members in the engine room, such as the engine and the transmission, are reliably received, and the deformation of the vehicle compartment can be reduced. In addition, by deviating from the body, it is possible to reduce a high deceleration in the latter half of the collision when receiving members in the engine room such as the engine and the transmission. Furthermore, the deformation stroke can be increased by moving the suspension member largely toward the rear of the vehicle body. Therefore, the vehicle deceleration characteristics in the latter half of the collision can be improved.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
One embodiment of a suspension member mounting structure according to the present invention will be described with reference to FIGS.
[0009]
In the drawings, the arrow FR indicates the forward direction of the vehicle, the arrow IN indicates the inward direction of the vehicle width, and the arrow UP indicates the upward direction of the vehicle.
[0010]
As shown in FIG. 5, the front suspension member 10 of the present embodiment includes a front mounting portion 12 formed at both ends in the vehicle width direction at the front and a rear mounting portion 14 formed at both ends at the rear in the vehicle width direction. , Are attached to left and right front side members 16 as bodies. The vehicle of the present embodiment is made of an aluminum body, and the front suspension member 10 and the front side member 16 are made of an aluminum alloy.
[0011]
As shown in FIG. 1, the rear mounting portion 14 of the front suspension member 10 is formed with a mounting hole 20 which is a long hole extending in the front-rear direction of the vehicle body. A bolt 22 is fastened as a fastening member for fixing the fixing member to the front side member 16.
[0012]
As shown in FIG. 2, the bolt 22 is disposed on the vehicle body rear end 20 </ b> A side of the mounting hole 20. Further, a washer 24 is attached to the bolt 22, and the washer 24 is in contact with the outer peripheral portion 14 </ b> A of the attachment hole 20 in the rear attachment portion 14.
[0013]
Therefore, when an input (arrow F) greater than a predetermined value larger than the fastening force of the bolt 22 is input to the rear mounting portion 14 of the front suspension member 10 from the vehicle front side to the vehicle rear side, the front suspension member 10 The rear mounting portion 14 moves relatively to the rear of the vehicle body with respect to the bolt 22.
[0014]
As shown in FIG. 1, a through hole 30 through which the screw portion 22A of the bolt 22 is inserted is formed in the lower wall portion 16A near the rear end of the kick portion lower end of the front side member 16, and the lower wall portion 16A A nut 32 is disposed coaxially with the through hole 30 on the upper surface of the nut. Further, the nut 32 is fixed to the front side member 16 by a convex portion 16B formed on the upper surface of the lower wall portion 16A and a bracket 34 disposed on the upper surface of the lower wall portion 16A.
[0015]
A notch 38 is formed in the lower wall 36A of the reinforcement 36 disposed inside the front side member 16 to prevent the bolt 22 from interfering with the screw 22A.
[0016]
A bush mounting portion 40 is formed in a portion of the front suspension member 10 different from the rear mounting portion 14, for example, in a portion of the front suspension member 10 on the vehicle body front side of the rear mounting portion 14. The side cross-sectional shape of the bush mounting portion 40 is substantially U-shaped with the opening directed toward the front of the vehicle body, and the rear end 42A of the lower arm 42 is inserted in the substantially U-shape.
[0017]
The rear end 42A of the lower arm 42 is connected via a bush 44 to a bolt 46 passing through the lower wall 40A and the upper wall 40B of the bush mounting portion 40 of the front suspension member 10, and the bolt 46 is connected to the upper wall. A nut 48 disposed on the upper surface of the portion 40B is screwed.
[0018]
A suspension member inclined surface 50 that is inclined from the upper front side of the vehicle body toward the lower rear side of the vehicle body is formed above the rear wall section 40C of the bush mounting portion 40 of the front suspension member 10. On the other hand, a body-side inclined surface 52 inclined from the upper front side of the vehicle body toward the lower rear side of the vehicle body is formed at a portion of the front side member 16 facing the suspension member inclined surface 50. The side inclined surface 52 faces substantially parallel.
[0019]
Therefore, when the front suspension member 10 moves horizontally to the rear of the vehicle along the mounting hole 20 by a predetermined distance, the suspension member inclined surface 50 and the body-side inclined surface 52 interfere with each other.
[0020]
Next, the operation of the present embodiment will be described.
[0021]
In the present embodiment, at the time of a frontal collision of the vehicle, as shown by a two-dot chain line in FIG. 5, the members 54 in the engine such as the engine and the transmission move rearward of the vehicle body (in the direction of arrow A in FIG. 5) and interfere with the suspension member 10. Then, the suspension member 10 is pressed toward the rear of the vehicle body (at this time, since the vehicle of the present embodiment is an aluminum body, the suspension member 10 cannot be largely deformed like a steel body).
[0022]
As a result, as shown in FIG. 2, an input (arrow F) of a predetermined value or more larger than the fastening force of the bolt 22 is input to the rear mounting portion 14 of the front suspension member 10 from the vehicle front side to the vehicle rear side. As shown in FIG. 3, the rear mounting portion 14 of the front suspension member 10 moves relative to the bolt 22 toward the rear of the vehicle body.
[0023]
At this time, since the rear mounting portion 14 of the front suspension member 10 is supported from below by the washer 24 mounted on the bolt 22, the rear mounting portion 14 of the front suspension member 10 does not fall below the vehicle body. Move horizontally to the rear of the vehicle.
[0024]
Thereafter, when the rear mounting portion 14 of the front suspension member 10 moves horizontally by a predetermined distance, the suspension member inclined surface 50 and the body-side inclined surface 52 interfere (surface contact).
[0025]
Therefore, an input to the rear of the vehicle body (arrow F1 in FIG. 3) input to the suspension member 10 from a member in the engine room, such as the engine and the transmission, along the suspension member inclined surface 50 and the body-side inclined surface 52. The input changes from the front upper side of the vehicle body to the rear side lower side of the vehicle body (arrow F2 in FIG. 4).
[0026]
As a result, a load (arrow F3 in FIG. 4) acting on the bolt 22 downward through the washer 24 toward the lower side of the vehicle body acts on the bolt 22, and the lower wall portion 16A of the front side member 16 is broken, and the bolt 22 is removed. It falls off together with the rear mounting portion 14 and the nut 32 of the front suspension member 10. For this reason, the suspension member 10 moves further rearward and downward.
[0027]
Therefore, in the present embodiment, the members in the engine room such as the engine and the transmission can be reliably received without breaking the suspension member 10 in the latter half of the collision, and the deformation of the vehicle compartment can be reduced. The bolts 22 for fixing the vehicle to the front side member 16 come off together with the rear mounting portion 14 and the nut 32 of the front suspension member 10 to reduce high deceleration when receiving a member in the engine room such as the engine and the transmission. Can be. Further, the deformation stroke can be increased by moving the suspension member 10 largely toward the rear of the vehicle body.
[0028]
As a result, the vehicle deceleration characteristic G2 in the latter half of the collision in the comparative structure in which the rear mounting portion of the front suspension member to the body and the bush mounting portion supporting the rear end of the lower arm are the same (dotted line in FIG. 6). In comparison with this, in the vehicle deceleration characteristic G1 (solid line in FIG. 6) in the latter half of the collision of the present embodiment, the vehicle generation G decreases and the deformation stroke increases. Therefore, in the suspension member mounting structure of the present embodiment, the vehicle deceleration characteristics in the latter half of the collision can be improved.
[0029]
In the above, the present invention has been described in detail with respect to a specific embodiment, but the present invention is not limited to such an embodiment, and various other embodiments are possible within the scope of the present invention. Some will be apparent to those skilled in the art.
[0030]
【The invention's effect】
The suspension member mounting structure according to the first aspect of the present invention is provided at a position different from the lower arm rear end support portion of the suspension member, the lower arm rear end support portion being provided at the suspension member and supporting the lower arm rear end portion, When a mounting portion to a body having a mounting hole which is a long hole extending in the front-rear direction of the vehicle body and the suspension member is inserted through the mounting hole to support the suspension member from below the vehicle body and a load equal to or more than a predetermined value acts below the vehicle body. A suspension member inclined surface which is formed on the vehicle body front side of a mounting member of the suspension member and which is attached to the body of the suspension member, and which is inclined from an upper front side of the vehicle body to a lower rear side of the vehicle body; A body side formed at a body-side portion that faces substantially parallel on the rear side of the vehicle body Because having a slope, and has an excellent effect of improving the vehicle deceleration characteristic in late collision.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a suspension member mounting structure according to an embodiment of the present invention.
FIG. 2 is a sectional view taken along line 2-2 of FIG.
FIG. 3 is an operation explanatory view of a suspension member mounting structure according to an embodiment of the present invention.
FIG. 4 is an operation explanatory view of the suspension member mounting structure according to the embodiment of the present invention.
FIG. 5 is a plan view showing a vehicle front portion to which the suspension member mounting structure according to one embodiment of the present invention is applied.
FIG. 6 is a graph showing vehicle deceleration characteristics of a vehicle to which the suspension member mounting structure according to one embodiment of the present invention is applied.
[Explanation of symbols]
10 Front suspension member 14 Rear mounting part of front suspension member 16 Front side member (body)
20 mounting hole 22 bolt (fastening member)
24 Washer (fastening member)
32 nut (fastening member)
40 Front side member bush mounting portion 42 Lower arm 50 Suspension member slope 52 Body side slope

Claims (1)

A lower arm rear end support portion provided on the suspension member and supporting the lower arm rear end portion;
A mounting portion for a body having a mounting hole that is provided in a different portion from the lower arm rear end support portion of the suspension member and that is a long hole extending in the vehicle longitudinal direction;
A fastening member that is inserted through the mounting hole and supports the suspension member on the body from below the vehicle body, and when a load equal to or more than a predetermined value acts below the vehicle body, the fastening member disengages from the body.
A suspension member inclined surface formed on the vehicle body front side of the mounting portion to the body in the suspension member, and inclined from the vehicle front upper side toward the vehicle rear lower side;
A body-side inclined surface formed at a body-side portion substantially parallel to the suspension member inclined surface on the vehicle rear side,
A suspension member mounting structure comprising:

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