CN202368294U - Antifatigue structure of automotive rear torsion beam - Google Patents

Abstract

The utility model relates to an antifatigue structure of an automotive rear torsion beam, which comprises dragging arms and a torsion beam main body. The antifatigue structure is mainly characterized in that lower parts of the two dragging arms, which are fixedly connected with the torsion beam main body, are respectively and fixedly welded with a reinforcing part; the edge of the lower part of the torsion beam main body, which is welded with the reinforcing parts, is provided with a U-shaped groove; and the welding edge parts of the reinforcing parts are warped upwards and fixedly welded in the U-shaped groove. The antifatigue structure disclosed by the utility model is smart in design; and compared with the prior art, the antifatigue structure disclosed by the utility model has the beneficial effects of enhancing the welding strength of the torsion beam and the reinforcing parts for connecting the torsion beam and the dragging arms, enabling a welding position to keep away from the stress concentration region, ensuring that a vehicle with multiple changes of axle distance and load, which is loaded with the rear torsion beam in the design, is not easy to rupture in the stress concentration region or a rear axle strength weakening region after traveling for a long time, prolonging the service life of the rear torsion beam and meeting the antifatigue design, by changing the welding arc-extinguishing positions and angles of the reinforcing parts in the stress concentration region.

Description

Torsion beam antifatigue structure behind the automobile

Technical field

The utility model relates to a kind of antifatigue technical field of automobile axle, is through the reinforcement that connects torsion beam and trailing arm is carried out local optimum specifically, thereby makes torsion beam antifatigue structure behind the automobile that back torsion beam type back axle improves service life greatly.

Background technology

As everyone knows, along with expanding economy, the raising of living standards of the people, automobile has become one of important vehicle that people ride instead of walk, and Biodge device is one of assembly indispensable on the automobile behind the suspension of automobile.Behind the automotive suspension Biodge device comprise torsion beam and with torsion beam bonded assembly trailing arm; Existing torsion beam is most for being welded; And because the back axle work under bad environment; Intensity and requirement fatigue life to torsion beam are just high especially, so all be welded with reinforcement between most now torsion beam and the trailing arm, satisfy intensity and tired requirement.But Along with people's to car comfort and science and technology property device require increasingly high; Vehicle wheel base and load produce multiple variation, cause existing reinforcement and torsion beam weld strength can not meet the demands, and vehicle is after going for a long time; Cause the weld fracture easily, finally cause the back axle fracture.So along with the development of automobile, common reinforcement design and welding method can not satisfy the fatigue design requirement.

Summary of the invention

The purpose of the utility model provides torsion beam antifatigue structure behind a kind of vapour carries out local structure optimization to the reinforcement that connects torsion beam and trailing arm the car.

The purpose of the utility model is achieved in that it includes two trailing arms; And the torsion beam main body between the trailing arm; It is characterized in that: the bottom in that two trailing arms are captiveed joint with the torsion beam main body is welded with a reinforcement respectively admittedly; Have U-lag with its lower edge of the torsion beam main body of reinforcement welding, and the welded edge position of reinforcement is for warpage upwards and be welded in the U-lag admittedly.

Because reinforcement and torsion beam bonded assembly edge joint weld receive the arc Position Design certain angle that becomes to be upturned, and are receiving under the crooked operating mode of side force thereby make in the back torsion beam, areal of stress concentration obtains change, and the realization antifatigue designs.Said reinforcement is integrated punching and the cross section with U-shaped, and in the place that the arc position is received in welding the reinforcement body is upwarped and to cooperate welding, and institute's bonded assembly torsion beam main body has U-lag so that the welding binding face is tight.

The utility model design is ingenious; Arc position and angle are received in welding through change reinforcement areal of stress concentration; Make its with prior art than having following beneficial effect: strengthened the weld strength of torsion beam with the reinforcement that is connected torsion beam and trailing arm; Make the position of weld avoid areal of stress concentration, make the vehicle with wheelbase and the multiple variation of load, the back torsion beam of carrying the design is not easy to cause areal of stress concentration (or perhaps Rear Axle weakness zone) to rupture after going for a long time; Prolong back torsion beam service life, satisfied the antifatigue design.

Optimizing structure through actual detected of the utility model promptly carried out the evaluation of performance boost through MTS and SINCO-TEC stand test.

Description of drawings

Fig. 1 is the welded structure simplified schematic diagram of the utility model;

Fig. 2 is torsion beam main body and the local simplified schematic diagram of amplifying of reinforcement welding among Fig. 1;

Fig. 3 is traditional in the past welded structure simplified schematic diagram.

The specific embodiment

Embodiment 1

Shown in Fig. 1～3; Keystone configuration among the figure comprises torsion beam main body 2 and two ends trailing arm 3 behind the automobile; Bottom in that two trailing arms 3 are captiveed joint with torsion beam main body 2 is welded with a reinforcement 1 respectively admittedly; Have U-lag with its lower edge of the torsion beam main body of reinforcement 1 welding, and the welded edge position 4 of reinforcement 1 is for warpage upwards and be welded in the U-lag admittedly.

Said trailing arm 3 cross sections are cylindrical shape, and torsion beam main body 2 is a U-shaped, and then for satisfying welding conditions, reinforcement 1 is a U-shaped near the partial cross section of torsion beam main body 2, and reinforcement 1 is the parallel open shape near the welded structure of trailing arm 3 parts.

See Fig. 2; The utility model design key is at reinforcement 1 and torsion beam main body 2 welded edge places, and the place of upwarping, reinforcement 1 edge is back torsion beam areal of stress concentration (being the Rear Axle weakness zone), upwarps the welding design that makes receipts arc position change through welding the body edges position; Avoided areal of stress concentration (shown in Figure 3); Thereby the enhancing strength at repeated alternation satisfies the antifatigue designing requirement, thereby automobile still is not easy to cause the weld fracture after long-term use; Prolong service life, thereby realized the purpose of the utility model.

It is apparent to one skilled in the art that the utility model can be changed into multiple mode, and the scope that breaks away from the utility model is not thought in such change.What all were such will be included within the scope of this claim the conspicuous modification of said those skilled in the art.

Claims (2)

1. torsion beam antifatigue structure behind the automobile; It includes two trailing arms; And the torsion beam main body between the trailing arm; It is characterized in that: the bottom in that two trailing arms are captiveed joint with the torsion beam main body is welded with a reinforcement respectively admittedly, has U-lag with its lower edge of the torsion beam main body of reinforcement welding, and the welded edge position of reinforcement is for warpage upwards and be welded in the U-lag admittedly.

2. torsion beam antifatigue structure behind the automobile according to claim 1 is characterized in that: reinforcement is the parallel open shape near the welded structure of trailing arm part.

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