JPH06340274A - Suspension cross member of vehicle - Google Patents

Abstract

PURPOSE:To provide a suspension cross member of a vehicle having sufficient strength for an external force acting on an arm support part while capable of being lightened. CONSTITUTION:A suspension cross member 1 of a vehicle consists of a body part, a car body mounting part 6, an arm support part 3 and blade piece part 5 and is made of a united cast aluminum alloy in which the blade piece part 5 is located on the same height as the arm support part 3 and the thickness of the blade piece part 5 is formed approximately in the horizontal direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension cross member for a vehicle arranged in the front part of a vehicle body.

[0002]

2. Description of the Related Art Conventionally, a suspension cross member for supporting a link type suspension device has been manufactured by combining two members made by pressing an iron plate, but recently, it has been gradually made into an integral unit made of aluminum die-cast. As a suspension cross member is being used. The suspension cross member is attached to a frame or the like on the vehicle body side, is connected to a suspension arm connected to wheels, and various forces act on it. In particular, when the suspension cross member is a cast product, there is an advantage that the suspension cross member can be formed relatively easily even if the suspension cross member has a complicated shape to some extent. Therefore, while the shape of the suspension cross member can be made arbitrary, it is necessary to reduce the weight of the suspension cross member while giving various consideration to the force coming from the vehicle body side or the suspension arm. In Japanese Utility Model Laid-Open No. Sho 64-39111, the suspension cross member is stopped on the vehicle body at two positions, right and left, respectively. However, the arm support portion of the suspension arm is provided near the vehicle body mounting portion of the suspension cross member. Since it is not provided, consideration must be taken to ensure the rigidity of the arm support portion, and weight reduction may not be easy.

Further, in Japanese Unexamined Patent Publication No. 4-306179, the suspension cross member is attached to the vehicle body at three holes (one on the front side and two on the rear side) provided on the left and right sides of the suspension cross member. Attached via an elastic member such as rubber. A suspension arm (a lower arm or an upper arm) is attached near the vehicle body support portion. More specifically, one end of the upper arm of the suspension device is attached to the link attachment portion near one front hole (vehicle body support portion). The rear end of the lower arm is very close to the two rear holes (body support) at the tip of the arm extending rearward from the main body of the suspension cross member, and the rear mounting between the two holes in plan view is performed. Attached to the section. On the other hand, the lower arm and the upper arm are connected to the wheel support for the front wheels via a ball joint provided at the other end of each. Therefore, the impact force from the front wheels enters these suspension arms. However, one end of the upper arm is supported near the vehicle body support part which is a front hole, and the rear end part of the lower arm is supported very close to the vehicle body support part which is two holes on the rear side. The distance that the impact force is transmitted to the vehicle body via the suspension cross member becomes shorter. Therefore, the bending that acts on the suspension cross member is reduced, and the misalignment of the front wheels and the impact force applied to the wheel support are reduced.

As described above, since the arm supporting portions such as the rear mounting portion and the link mounting portion for supporting one end of the suspension arm are provided in the vicinity of the vehicle body supporting portion of the suspension cross member, the arm supporting portions are Even if it is a cantilevered portion such as a rising portion or an arm extending from the main body of the suspension cross member, the overhanging cantilevered portion is directly supported by the vehicle body, so it is not possible to expect great strength. Even if a suspension arm that transmits impact force is attached to the rising portion or the arm, the deformation of the arm or the rising portion is suppressed. Therefore, even when the multi-link suspension device is mounted, it is disclosed that a certain degree of freedom is secured in arranging each arm that constitutes the link.

[0005]

As described above, when a cast product such as aluminum cast is used for a suspension cross member and mounted on a vehicle body, how to mount the suspension cross member after taking into account its weight reduction. An important issue is how to secure the strength of the part. Actual Kaisho 6
In Japanese Patent Laid-Open No. 4-39111, as a consideration for ensuring the rigidity (strength) of the arm support portion that supports the suspension arm, when the suspension cross member is a cast product, the arm support portion is not Since it will be provided in the vicinity, when the arm support part is located on the left and right end sides of the vehicle body, the main body part becomes excessively large, or when the arm part protruding from the main body part is provided and supported. Needs to keep their arms short and thick. As a result, there are problems that the weight reduction of the suspension cross member is hindered and the degree of freedom in selecting the shape is reduced.

In the above-mentioned Japanese Patent Application Laid-Open No. 4-306179, which has been made in view of the above-mentioned problems, vehicle body supporting portions are provided at three positions on each of the left and right sides of the suspension cross member, and in the vicinity of the vehicle body supporting portion, By providing an arm support part that supports the suspension arm,
The suspension cross member is prevented from being deformed against an input load. The suspension cross member has a U-shape in a plan view such that two arms extend rearward with respect to the main body, and therefore the arms are thin. As described above, the rear end of the lower arm is attached to the rear end of the arm, so that the arm will bend because the arm is thin when an impact force is applied, for example, when the vehicle gets over a stone or the like. Or easily deformed. Therefore,
In order to increase the rigidity of the mounting portion of the lower arm in this arm portion, it is disclosed that the lower portion is reinforced by connecting ribs extending from the main body portion. There is no disclosure of technical ideas. An object of the present invention is to make an aluminum alloy which is integrally cast, and can secure the rigidity (strength) of the arm supporting portion even when the arm supporting portion is positioned on the left and right end sides of the vehicle body, and to reduce the weight. To provide a vehicle suspension cross member that can be achieved.

[0007]

According to the present invention, there is provided an arm support portion which is integrally formed in the width direction of a vehicle body and which supports a body portion and vehicle body mounting portions and suspension arms provided at both left and right ends of the body portion. And a wing piece portion connected to the arm support portion and the main body portion, the wing piece portion being at substantially the same height as the arm support portion, and the wing A suspension cross member for a vehicle, characterized in that a thick surface of one portion is made substantially horizontal. And, it is made of an integrally cast aluminum alloy, and the wing piece portion and the vehicle body mounting portion are formed with a step, and the step portion has a J-shaped, C-shaped or H-shaped cross section. ing.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic plan view of a suspension cross member for a vehicle according to an embodiment of the present invention.
FIG. 2 is a sectional view of FIG. 1 as viewed from the left and right direction of the vehicle body. Figure 3
FIG. 2 is a diagram showing a cross-sectional shape taken along the line AA of FIG. 1. Left and right of the main body portion 4 of the suspension cross member 1 (in FIG. 1, the up-down direction indicates the vehicle body left-right direction, and the left direction in FIG. 1 indicates the vehicle front side).
A vehicle body mounting portion 6 and an arm support portion 3 (FIG. 1) provided at three locations (one location on the front side and two locations on the rear side) of each end.
In the left side of the front side of the vehicle.
Only two are shown at the left and right ends (when mounting a multi-link suspension, one end of the upper arm is fastened to the front side and one end of the lower arm is fastened to the rear side). Cage, arm support 3
A wing piece portion 5 is formed so as to be connected to the main body portion 4 and a hole is formed in the wing piece portion 5. To the arm support portion 3 shown in FIG. 1, one end of an arm connected to a wheel support of a front wheel via a ball joint is fastened and fixed by a fastening pin. The impact force when the front wheel gets over a protrusion such as a stone is transmitted to the arm supporting portion 3, and the external force acting on the arm supporting portion 3 is transmitted to the wing piece portion 5 and further to the main body portion 4. The transmission force due to this external force acts to cause local deformation or twisting of the suspension cross member 1. Since the thick surface of the portion 5 is formed substantially horizontally, the suspension cross member 1 is prevented from being locally deformed or twisted.

When changing the wall thickness of the wing piece portion 5, a full-scale model is made of a urethane foam model, and when the external force acts on the arm support portion 3, the suspension cross member 1 is formed at various places. Measure the generated distortion,
The suspension cross member 1 of the actual body is designed to withstand the external force received. In addition, the wing piece portion 5 is shown in FIG.
As shown in FIG. 3, it is formed with a step from the vehicle body mounting portion 6, and the wing piece portion 5 is formed so as to withstand a load against an external force acting on the arm support portion 3. The cross section of the stepped portion is (A) in terms of strength as shown in FIG.
It is formed in a J shape, a (B) C shape, a (C) H shape, or the like.
The suspension cross member 1 is manufactured by integral casting of an aluminum alloy (for example, AC4CH-T6), and gives strength to the wing piece parts 5 connected from the main body part 4 so that an external force acts on the arm support part 3. Designed to withstand the transmission of forces. It should be noted that the holes 8 are provided so as to penetrate through the wing piece portion 8 to allow drainage, which is effective in rust resistance and contributes to weight reduction (reduction of the weight of members corresponding to the holes 8). is doing.

[0010]

EFFECTS OF THE INVENTION According to the integrally cast aluminum alloy suspension cross member of the present invention, the wing piece portion is made substantially the same height as the arm support portion with respect to the input from the arm support portion, and the wall thickness is substantially horizontal. Therefore, it is possible to improve rigidity, prevent deformation without requiring a separate reinforcing member, and effectively reduce the weight significantly.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a suspension cross member for a vehicle according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view of the vehicle body in the left-right direction of FIG.

3 is a diagram showing a cross-sectional shape taken along the line AA of FIG.

[Explanation of symbols]

 1 Suspension cross member 2 Arm 3 Arm support part 4 Main body part 5 Wing piece part 6 Car body mounting part 7 Pin 8 Hole

Claims (5)

[Claims] 1. A suspension comprising a main body portion, a vehicle body mounting portion provided at each of left and right ends of the main body portion, an arm support portion, and a wing piece portion continuous with the arm support portion and the main body portion. A suspension cross member for a vehicle, which is a cross member, wherein the wing piece portion is at substantially the same height position as the arm support portion, and a thickness surface of the wing piece portion is substantially horizontal. . 2. The suspension cross member for a vehicle according to claim 1, wherein the suspension cross member is made of an integrally cast aluminum alloy. 3. The wing piece portion and the vehicle body mounting portion are formed with a step.
The vehicle suspension cross member described in. 4. The cross section of the step is J-shaped, C-shaped or H-shaped.
The suspension cross member for a vehicle according to claim 1, wherein the suspension cross member has a shape. 5. The suspension cross member according to claim 1, wherein holes are provided in the wing piece portion.