Method for connecting automobile guide arm and axle and connecting structure

Abstract

The invention provides a method for connecting an automobile guide arm and an axle and a connecting structure so as to overcome defects existing in rigid connection of a middle straight section of anexisting guide arm and the axle. The method comprises the following steps: making the middle part of the guide arm into a circular arc shape; enabling the inner arc surface of a circular arc part to be matched with the outer circular surface of a to-be-connected axle tube in shape; and attaching a middle circular arc part of the guide arm to the upper surface of the outer circle of the axle tube,then covering a pressing plate on the upper portion of the circular arc part of the guide arm, and fastening and clamping the guide arm and the axle into an integral assembling body through two U-shaped bolts or a lower supporting plate on the lower portion of the outer circle of the axle tube. According to the connecting mode, due to a fact that a connecting frame is omitted, damage of weld joints to the strength of the axle is avoided, working procedure time of vehicle production is shortened, maintenance and replacement of related components are more convenient, and light weight of a vehicle is particularly facilitated.

Description

technical field [0001] The invention relates to the technical field of automobile chassis, in particular to a connection method and a connection structure for connecting an automobile guide arm and an axle. Background technique [0002] The guide arm is the main suspension component connecting the axle and the frame (body), and its function is to transmit the force and moment between the axle and the frame, and to constrain the movement track of the axle relative to the frame. The installation method of the guide arm on the automobile chassis is generally as follows: the front end of the guide arm is hinged to the vehicle frame through a bushing, the middle straight section is rigidly fixed to the axle, and the rear end is connected to the vehicle frame through an air spring. Among them, the existing method of rigidly affixing the middle straight section of the guide arm to the axle is: welding the connecting frame on the axle, using a pressure plate to clamp the straight se...

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Problems solved by technology

[0003] 1. This connection method needs to weld the connecting frame on the axle. Due to the influence of the weld seam, the strength of the axle tube is damaged;

[0004] 2. The guide arm and the axle connected by this method, when the vehicle rolls (or one side of the wheel passes through the bump or pit), due to the influence of the torsional stiffness of the axle around its central axis, the front end of the guide arm is at the hinge point The vertical loads experienced by the rear end at the position of the air springs are not levered proportional to the axle center axis; and the torsional stiffness provided in the longitudinal plane of the vehicle coordinate system due to the front articulation pair of the guide arm It is very small and negligible, so the rigid fixed joint of the straight section in the middle must exert a moment around the central axis of the axle to the guide arm, so that the moment of the guide arm is balanced, and this moment is mostly composed of the axial force of the U-bolt, the guide arm The distributed pressure on the contact surface with the connecting frame is provided, which can easily lead to overloading of U-shaped bolts, fatigue failure and loosening of thread pairs, resulting in serious safety accidents;

[0005] 3. Due to the existence of the connecting frame, this method increases the weight of the suspension system, so it is not conducive to the lightweight of the whole vehicle;

[0006] 4. Due to the error in the manufacturing process of the connecting frame of this method, there is often a gap between the connecting frame and the axle that should be in contact with the surface, but only the welding seam is connected. In this case, the guide arm and the connecting frame are facing each other. When the axle has a tendency to move in all directions, the reliability of the weld connection is insufficient, and the axle tube is subject to a large stress at the weld position, which is prone to overload or fatigue failure

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