CN203110866U

CN203110866U - Transverse beam of torsion beam rear axle

Info

Publication number: CN203110866U
Application number: CN 201320085564
Authority: CN
Inventors: 顾伟明; 倪海华; 池亿; 梁筱倩
Original assignee: Shanghai Huizhong Automotive Manufacturing Co Ltd
Current assignee: Shanghai Huizhong Automotive Manufacturing Co Ltd
Priority date: 2013-02-25
Filing date: 2013-02-25
Publication date: 2013-08-07
Anticipated expiration: 2023-02-25

Abstract

The utility model provides a transverse beam of a torsion beam rear axle. The transverse beam of the torsion beam rear axle enables the torsion beam rear axle to obtain high torsional rigidity, and meanwhile the stress of a cross beam body is small. To achieve the goal, the transverse beam of the torsion beam rear axle is characterized by comprising U-shaped sections, a V-shaped section and transitional sections, wherein the U-shaped sections are located at two ends of the transverse beam, the V-shaped section is located on the middle section of the transverse beam, each transitional section is located between each U-shaped section and the V-shaped section, the cross sections of the U-shaped sections are of U shapes, the cross section of the V-shaped section is of a V shape, the cross section of each transitional section is gradually changed from the U shape to the V shape from each U-shaped section side to the V-shaped section side, and the transverse beam of the torsion beam rear axle is made to be in a state tending equal stress as a whole relative to a U-shaped transverse beam of a torsion beam rear axle or a V-shaped transverse beam of a torsion beam rear axle.

Description

Torsion beam back axle crossbeam

Technical field

The crossbeam of the utility model design vehicle back axle torsion beam.

Background technology

At present in, the back axle that adopts of low side car is based on the semi-independent suspension back axle of torsion beam, its beam structure form is divided into U-shaped beam, V-beam two big classifications basically.Wherein, the U-shaped beam is compared with V-beam, the torsional stiffness that easier acquisition is bigger, but crossbeam weight is often heavier, and the cross beam edges fiber stress is relatively large.

The utility model content

The purpose of this utility model is to provide a kind of torsion beam back axle crossbeam, so that the torsion beam back axle is when obtaining high torsional stiffness simultaneously, cross-beam body stress is less.

For realizing the torsion beam back axle crossbeam of described purpose, be characterized in, comprise U-shaped section at two ends, at the V-arrangement section in stage casing and the transition phase between U-shaped section and the V-arrangement section, the cross section of this U-shaped section is U-shaped, the cross section of this V-arrangement section is V-arrangement, the cross section of this transition phase fades to V-arrangement to V-arrangement section side by U-shaped from U-shaped section side, so that this torsion beam back axle crossbeam is the state that is tending towards equal stress on the whole with respect to U-shaped torsion beam back axle crossbeam or V-arrangement torsion beam back axle crossbeam.

Owing to have described transition phase, therefore, cross-beam body stress is less, and can also reach the purpose of loss of weight.

Aforementioned purpose of the present utility model, characteristics and advantage will have more detailed description in embodiment described later.

Description of drawings

Fig. 1 is the front view of torsion beam back axle crossbeam.

Fig. 2 has shown a plurality of cross sections of torsion beam back axle crossbeam.

Fig. 3 is that the axle of torsion beam back axle crossbeam is surveyed view.

Fig. 4 is the partial view of torsion beam back axle.

Fig. 5 is the schematic diagram of the adjustment cross sectional shape of torsion beam back axle.

The specific embodiment

As shown in figures 1 and 3, the line of centers X both sides of torsion beam back axle crossbeam are symmetry in fact, have U-shaped section 2 in the end respectively, at V-arrangement section 1 and the transition phase 3(between U-shaped section 2 and V-arrangement section 1 or the cross section gradual change section of centre).Right side with the line of centers X among Fig. 1 is that example describes, with line of centers X be the starting point of transition phase at a distance of M place, with line of centers X apart the N place be the terminal point of transition phase.The cross section of U-shaped section 2 is U-shaped, and the cross section of V-arrangement section 1 is V-arrangement.And the cross sectional shape of transition phase 3 is gradual changes, namely fades to U-shaped from origin-to-destination by V-arrangement, perhaps fades to V-arrangement by terminal point to playing by U-shaped.As depicted in figs. 1 and 2, illustrate respectively in Fig. 2 along the cross sectional shape of A-A line, B-B line, C-C line, D-D line and E-E line, shown a plurality of cross sectional shapes that faded to V-arrangement by U-shaped from right to left.From a plurality of cross sectional shapes shown in Figure 2, progressive formation is that the U-shaped two side tilts gradually and U-shaped bottom narrows down, is punctured into the transition arc of two side gradually.

The shape specific design of transition phase 3 can be controlled the position of starting point, terminal point in CAD software, the cross sectional shape according to starting point, terminal point calculates generation automatically by CAD software then.By regulating the diverse location of starting point, terminal point, just can obtain the transition phase 3 of different detailed shape, this also can finely tune the crossbeam torsional stiffness.

After " U " cross section of equal A/F fades to " V " cross section, cross sectional moment of inertia, radius of gyration all reduce to some extent, be beneficial to and reduce cross beam edges fiber stress when reversing, cross section owing to transition phase 3 changes gradually simultaneously, crossbeam integral body is tending towards " equal stress " design, taking full advantage of of material, beneficial to loss of weight, even if the torsional stiffness of overall beam decreases.Car load is to the requirement of back axle roll rate, mainly determined by torsion beam back axle contribution margin and two main portions of rear spring rigidity to roll rate, the variable section design of previous embodiment is acceptable to the influence of car load back axle roll rate basically, perhaps just can meet the requirements by adjusting rear spring rigidity simply, even if can not meet the requirements, then correspondingly change the position of crossbeam in torsion beam welding assembly, also finally can reach designing requirement.Previous embodiment is compared with in the past simple U-shaped or v-shaped structure like this, and it is finding the appropriate balance point aspect torsional stiffness, the crossbeam stress two, make back axle assembly obtain to roll preferably performance and endurance quality simultaneously.The raising of endurance quality and the framing member maxim that meets with stresses is relevant, in theory, when maximum stress descends 10%, can be increased to original 1.5～1.7 times fatigue life.Because previous embodiment has reduced cross beam edges fiber stress when reversing, so durability must obtain to improve.

In the aforementioned embodiment, with respect to structure in the past, the stress value of crossbeam particular location contrast (units MPa in the following table) as shown in the table:

As shown in Figure 4, it has shown the position of torsion beam back axle crossbeam at back axle assembly, and wherein the reinforced rib location of maximum stress is at the F place, and the crossbeam location of maximum stress is at the E place, and the weld seam location of maximum stress is at the H place, and the brace panel location of maximum stress is at the J place.In the aforementioned embodiment, with respect to structure in the past, other operating mode maximum stress value contrast (units MPa in the following table) as shown in the table:

The above results shows, previous embodiment is compared with traditional uniform cross-section crossbeam at the variable section design plan of torsion beam crossbeam, the stress of each high stress areas of back axle all is obvious downswing under each operating mode, for obvious effect is arranged the fatigue life of improving the back axle use.

The marrow of the variable section of transition phase 3 design is to make crossbeam integral body to be tending towards the equal stress design in the foregoing embodiments, if uniform crossbeam, there is the unbalanced situation of distribution of stress at cross-beam body, part position stress can be starkly lower than the tired permissible stress of material, cause the inadequate utilization of material, also just make the variable section design of transition phase 3 have the possibility of loss of weight; Previous embodiment can cut section bar based on even " U " and improve, and also can cut section bar at even " V " and improve, and the degree of loss of weight is different along the factors such as adjustment amount on the front and rear direction with concrete crossbeam moulding, thickness of slab and crossbeam.

The beam design exploitation of applicable all the torsion beam structure back axles of version of the variable section formula crossbeam of previous embodiment, structure is unique reliable, uses the torsion beam back axle of this version crossbeam to be convenient to obtain higher Combination property.

The version of the torsion beam back axle crossbeam of previous embodiment possesses higher general applicability, by adjusting the concrete shape in U-shaped cross section, two ends, V-arrangement cross section, stage casing, can obtain the torsional stiffness of various numerical value, is conducive to adapt to the hardware and software platform design.For example, the vehicle of identical platform, its framing member form basically identical, but because the difference of concrete vehicle rear overhang performance requriements may need framing member to change slightly.Be example with the torsion beam back axle crossbeam in the previous embodiment, require to change as rear suspension roll rate, only need to remove to revise parameter opening size L, height H, radius of curvature R, angle theta, length M as shown in Figure 1, N as shown in Figure 5 according to cae analysis report or topological optimization result, can easily adjust the crossbeam moulding, obtain the crossbeam of different torsional stiffnesies.

Claims

1. torsion beam back axle crossbeam, it is characterized in that, comprise U-shaped section at two ends, at the V-arrangement section in stage casing and the transition phase between U-shaped section and the V-arrangement section, the cross section of this U-shaped section is U-shaped, the cross section of this V-arrangement section is V-arrangement, the cross section of this transition phase fades to V-arrangement to V-arrangement section side by U-shaped from U-shaped section side, so that this torsion beam back axle crossbeam is the state that is tending towards equal stress on the whole with respect to U-shaped torsion beam back axle crossbeam or V-arrangement torsion beam back axle crossbeam.