JPH0513876B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automobile frame, and particularly to an automobile frame comprising left and right side members and a cross member bridging them.

[Prior art] Figure 4 shows a frame for an automobile of this type.
This is a general external perspective view of a so-called ladder-shaped frame, which includes left and right side members 1 and 2 that extend horizontally in the longitudinal direction of the vehicle body on both sides in the vehicle width direction, and left and right side members 1 and 2 that are connected at both ends to extend the vehicle width. It is configured in a ladder shape with a plurality of cross members 3 extending in the direction, and a vehicle body (not shown) is mounted via a rubber mount. For example, this is "Complete Book of Automotive Engineering Volume 13, Passenger Car Body", No. 28, published by Sankaido Co., Ltd. on April 20, 1981.
Shown on page.

By the way, as shown in Fig. 5, cross member 3
The cross member 3 is arranged in a straight line above the space 4 between the left and right side members 1 and 2 by connecting both ends of the cross member 3 to the inner upper parts of the left and right side members 1 and 2, and connecting the cross member 3 in the space 4 For example, functional parts such as the propeller shaft 5 and the muffler 6 are placed below the vehicle 3, and the height of these functional parts from the ground is increased to protect the functional parts from flying stones and interference with the road surface during driving. be.

In addition, 7 is a suspension mount bracket that is fixed to the lower part of the left and right side members 1 and 2, and rotatably connects the 8 ends of the leaf springs of the suspension to the left and right side members 1 and 2, and 9 is a suspension mount bracket that is fixed to the lower part of the left and right side members 1 and 2. be.

[Problems to be Solved by the Invention] However, in such a structure, even if the vertical width of the left and right side members 1 and 2 is increased in order to increase the strength against external forces such as thrusting up while driving, torsion, and vibration. In order to avoid functional parts, the vertical width of the cross member 3 is small, which not only makes it impossible to sufficiently increase the bending and torsion strength of the frame as a whole, but also prevents the leaf springs 8 from being connected to the left and right side members 1 and 2. It is not possible to attenuate the transmitted vibration in the torsional direction, and on the contrary, it resonates at a low frequency, amplifying the vibration and transmitting it to the car body, which may cause car body vibration and muffled noise.

Therefore, the present invention increases the strength of the entire frame without impairing the arrangement of functional parts, and reduces vibrations in response to input from the suspension.
The present invention provides an automobile frame that can improve the sense of quality.

[Means for Solving the Problems] In the present invention, the cross member is formed into an arch shape that projects upward in the vehicle height direction, and both ends of the cross member are attached to the suspension mount bracket together with the suspension. It was designed to be tightened.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, with the same reference numerals assigned to the same parts as in the conventional structure.

In FIG. 1 and FIG. 2, 1 and 2 are a pair of left and right side members extending in the longitudinal direction of the vehicle, and are box-shaped in cross section with a thick U-shaped outer panel 11 and a thin U-shaped inner panel 12. It is formed by welding _W1 .

Suspension mount brackets 7, ₇ (hereinafter simply referred to as brackets) are welded to the lower ends of the side members 1, 2 on the outer panel 11 side.
and protrudes downward. This bracket 7,
At 7, leaf springs 8, 8, which are suspensions, are rotatably supported by pins 14, 14.

The cross member 10, which extends in the vehicle width direction and is installed between the side members 1 and 2, is formed in an arch shape projecting upward in the vehicle height direction Z-Z, and has a mass damper, a dynamic damper, etc. in the center part. A damper part 13 is attached.

Both ends 16, 16 of the cross member 10 are pin 1
4 and 14, the brackets 7 and 7 are jointly fastened and connected.

With the above configuration, the cross member 10 is assembled in an arch shape across the left and right side members 1 and 2, so functional parts such as the propeller shaft 5 and the muffler 6 can be arranged below the cross member 10 in the space 4. By increasing the height of these functional parts from the ground, they are protected from flying stones and road surface interference while driving.

Moreover, the vibration input from the suspension that is transmitted to the side members 1 and 2, and further transmitted from the side members 1 and 2 to the vehicle floor via the rubber mount to generate vehicle body vibration and muffled noise, is transmitted to the suspension leaf spring 8, 8 and the brackets 7, 7 fixed to the side members 1, 2.
Since both ends 16, 16 of 0 are directly connected,
In particular, vibrations entering the side members 1 and 2 in the torsional direction can be efficiently damped by the damping characteristics of the arched shape of the cross member 10, and vehicle body vibration and muffled noise can be reduced.

Furthermore, the side members 1 and 2 of the cross member 10
Since the joint is jointly fastened with the pin 14, there is no need for welding as in the conventional case, and no welding equipment is required, improving manufacturability.

FIG. 3 shows another embodiment.

In this embodiment, a pair of brackets 7, 7 are provided protruding from the lower left and right ends of the side members 1, 2, and a leaf spring is connected to the bracket 7, 7 located on the inside in the vehicle width direction by means of pins 14, 14. This was jointly concluded with 8. This embodiment also exhibits the same effect as in FIG. 1.

[Effects of the Invention] As described above, according to the present invention, the structure and manufacturing can be simplified, and vibrations and muffled sounds can be effectively reduced.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention. FIG. 1 is a sectional view taken along the vehicle width direction, FIG. 2 is a sectional view taken along the line shown in FIG. FIG. 4 is a sectional view similar to FIG. 1 showing a different example, FIG. 4 is a perspective view showing the general appearance of a ladder-shaped frame, and FIG. 5 is a sectional view taken along line 4-- showing a conventional example. (Explanation of symbols indicating main parts of drawings), 1,
2: Side member, 7: Suspension mount bracket, 8: Leaf spring (suspension), 10: Cross member, 14: Pin, 1
6: Cross member end.

Claims (1)

[Claims] 1. An automobile frame consisting of a pair of left and right side members extending in the longitudinal direction of the vehicle and having suspension mount brackets protruding from their lower ends, and a cross member extending in the width direction of the vehicle and installed between the side members. In the automobile frame, the cross member is formed into an arch shape projecting upward in the vehicle height direction, and both ends of the cross member are fastened to the bracket together with the suspension.