CN203844573U

CN203844573U - Rear axle of torsion beam

Info

Publication number: CN203844573U
Application number: CN201420203808.5U
Authority: CN
Inventors: 许光
Original assignee: Shanghai Huizhong Automotive Manufacturing Co Ltd
Current assignee: Shanghai Huizhong Automotive Manufacturing Co Ltd
Priority date: 2014-04-24
Filing date: 2014-04-24
Publication date: 2014-09-24
Anticipated expiration: 2024-04-24

Abstract

The utility model aims to provide a modified rear axle of a torsion beam to reduce risks of fatigue failure of welding seams. The rear axle comprises a cross beam and longitudinal beams, and the cross beam is provided with a V-shaped opening. The rear axle is characterized in that skirt sections at two ends of the cross beam open outwards relative to the middle of the cross beam, the two ends of the cross beam extend downwards relative to the middle of the cross beam, and notches are arranged in welding points of bottoms of the two ends of the cross beam and the longitudinal beams.

Description

Torsion beam back axle

Technical field

The utility model relates to automobile torsion beam back axle.

Background technology

Torsion beam back axle is widely adopted because cost simple in structure is low, but easily there is fatigue failure because complicated reverse stresss such as being subject to torsional bending causes its weld seam in one of its fatal shortcoming exactly, the weld seam of crossbeam and two ends longeron particularly, often there is very high fatigue stress, be difficult to be reduced in normal range.

Utility model content

A kind of method that the purpose of this utility model is to provide improved torsion beam back axle and reduces welding stress, to reduce the risk of its soldered generation fatigue failure.

For realizing the torsion beam back axle of described object, there is crossbeam and longeron, crossbeam is opening V-beam, be characterized in, outwards open with respect to the middle part of crossbeam in the skirt section at crossbeam two ends, and stretch downwards at the middle part of the relative crossbeam in two ends of crossbeam, and bottom, crossbeam two ends arranges breach with longitudinal beam welding place.

Described torsion beam back axle, its further feature is, the distance that described starting point of opening is the left and right longitudinal plane of symmetry of automobile to crossbeam longitudinal plane of symmetry is B, and the front and back weld seam of crossbeam and longeron is twice B to the distance of the closest approach of crossbeam longitudinal plane of symmetry, and the monolateral angle of opening of crossbeam is not more than 1 °.

Described torsion beam back axle, its further feature is, the starting point that stretch downwards in the skirt section at the two ends of crossbeam is B to crossbeam longitudinal plane of symmetry, and the front and back weld seam of crossbeam and longeron is twice B to the distance of the closest approach of crossbeam longitudinal plane of symmetry, and the angle beta that skirt section is stretched is downwards not less than 6.3 °.

Described torsion beam back axle, its further feature is that the length of this breach on left and right directions is the aperture of the V-beam expansion that this breach is corresponding.

The method of reduction torsion beam rear-axle welding stress of the present utility model, the crossbeam of this torsion beam is opening V-beam, be characterized in, the middle part of the relative crossbeam of opening at the two ends of this crossbeam is opened, to improve the rigidity of this crossbeam, this amount of opening is taken into account the stress producing on crossbeam and longeron weld seam, so that this stress is in scope of design; For improving the rigidity of this crossbeam, also by the middle part of the relative crossbeam at the two ends of this crossbeam to downward-extension, the angle of this extension is taken into account the stress producing on crossbeam and longeron weld seam, so that this stress is in scope of design, also at the place, bottom end and longitudinal beam welding of crossbeam, breach is set, by control this breach length, reduce welding stress with the width of the skirt end tablet of longitudinal beam welding.

Described method, its further feature is, the distance that described starting point of opening is also the left and right longitudinal plane of symmetry of automobile to crossbeam longitudinal plane of symmetry is B, and the front and back weld seam of crossbeam and longeron is twice B to the distance of the closest approach of crossbeam longitudinal plane of symmetry, and the monolateral angle of opening of crossbeam is not more than 1 °.

Described method, its further feature is, the starting point that stretch downwards in the skirt section at the two ends of crossbeam is B to crossbeam longitudinal plane of symmetry, and the front and back weld seam of crossbeam and longeron is twice B to the distance of the closest approach of crossbeam longitudinal plane of symmetry, and the angle beta that skirt section is stretched is downwards not less than 6.3 °.

Described method, its further feature is the length of this breach to be associated with the aperture that described opening opens, with the relation of rigidity equilibrium and intensity, make this torsion beam both meet rigidity needs, make again the weld stress of crossbeam and longeron be reduced to acceptable scope.

The utility model is by the design of physical dimension relation, well coordinated balance the contradictory relation of Rigidity and strength, both can meet rigidity needs, also can make crucial weld stress be reduced to acceptable scope.

Accompanying drawing explanation

The above and other feature of the present utility model, character and advantage become more obvious by the description by below in conjunction with drawings and Examples, wherein:

Fig. 1 is the birds-eye view of the torsion beam back axle of an embodiment of the utility model.

Fig. 2 is the section-drawing along the A-A line of Fig. 1.

Fig. 3 is the section-drawing along the B-B line of Fig. 1.

Fig. 4 is the back view of the torsion beam back axle of an embodiment of the utility model.

The specific embodiment

Below in conjunction with specific embodiments and the drawings, the utility model is described in further detail; set forth in the following description more details so that fully understand the utility model; but the utility model obviously can be implemented with the multiple alternate manner that is different from this description; those skilled in the art can do similar popularization, deduction according to practical situations without prejudice to the utility model intension in the situation that, therefore should be with the content constraints of this specific embodiment protection domain of the present utility model.

Fig. 1 to Fig. 4 has shown the torsion beam after improving, and the crossbeam 1 of this torsion beam is opening V-beam, and its cross section is essentially V-arrangement, and upside is opening, and the open interior of V-beam can arrange reinforcement gusset, to increase the rigidity of crossbeam 1.Torsion beam shown in Fig. 1 is in being installed to the state on vehicle body, the front side that the upside in figure is vehicle, and the rear side that downside is vehicle, left and right sides is respectively the left and right sides of vehicle.

According to method of the present utility model, will reduce torsion beam rear-axle welding stress on the one hand, be the rigidity that will increase torsion beam on the other hand, i.e. the performance of balance welding stress and this conflict of rigidity.

In Fig. 2, the longeron 2 in left side and the longeron 3 on right side are almost symmetrical, object for the ease of clear demonstration with embodiment related content, the auxiliary parts such as spring holder, damper bracket have been omitted, in explanation below, with the example that is welded as of the longeron 2 in left side and crossbeam 1, these explanations are also suitable for being connected of the longeron 3 on right side and the right-hand member of crossbeam 1 simultaneously.

The method of reduction torsion beam rear-axle welding stress of the present utility model is in embodiment as shown in Figure 1, and first it be that the opening of the end of crossbeam is opened outwardly away from each other.For the crossbeam before improving, the aperture of its opening is all much the same or perhaps identical at whole length direction, by the opening of end is opened outwardly away from each other, the amount of opening is taken into account the stress producing on crossbeam and longeron weld seam, so that this stress is in scope of design.The appropriateness at the two ends of the crossbeam by V-arrangement is opened, and can improve the rigidity of crossbeam, when improving transverse beam rigidity, takes into account the head of stress, particularly weld seam and the stress of afterbody of generation on the forward and backward weld seam 22,21 of crossbeam and longeron.

The method of reduction torsion beam rear-axle welding stress of the present utility model is in embodiment as shown in Figure 4, it is also suitably bent downwardly stretching, extension in whole end in other words by the skirt section, front and back at crossbeam two ends, the skirt section of crossbeam refers to two sidewall, as shown in Figures 2 and 3, two sidewalls link together in bottom, form the roughly cross sectional shape of forming V-shape.For the crossbeam before improving, the ridge side of crossbeam (bottom of V-arrangement) is roughly on a horizon, according to method of the present utility model, the ridge side at two ends is stretched downwards together with skirt section, the ridge line that stretching, extension has or skirt section are all smooth, from Fig. 4, the two ends of ridge line are bent downwardly stretching, extension a little.When stretch downwards two ends that make crossbeam, also to take into account the stress producing on the front and back weld seam 22,21 of crossbeam and longeron, so that this stress is in scope of design, like this in increase rigidity or welding stress is controlled in scope of design.

The method of reduction torsion beam rear-axle welding stress of the present utility model is in embodiment as shown in Figure 4, also in the position of the ridge side longitudinal beam connected of crossbeam, be formed with breach 12, by breach 12, control the tablet width of the skirt end welding with longeron 2, can effectively reduce welding stress like this, in addition, the opening aperture in the V-arrangement cross section of the left and right directions length of breach 12 crossbeam corresponding with breach can also be associated, so that guarantee rigidity when reducing welding stress.

By the design of above physical dimension relation, well coordinated balance the contradictory relation of Rigidity and strength, both can meet rigidity needs, also can make crucial weld stress be reduced to acceptable scope.

According to aforesaid method; the preferred embodiment of torsion beam back axle of the present utility model is shown in Fig. 1 to Fig. 4; it should be noted that; these and follow-up other accompanying drawing are all only as example; it is not to draw according to the condition of equal proportion, and should not using this as the protection domain of the utility model actual requirement is construed as limiting.

As shown in Figure 1, torsion beam back axle has crossbeam 1 and longeron 2,3, crossbeam 1 is opening V-beam, outwards open with respect to the middle part of crossbeam 1 in the skirt section at crossbeam 1 two ends, as shown in Figure 4, stretch downwards at the middle part of the relative crossbeam in two ends of crossbeam 1, and crossbeam 1 skirt section, two ends and longeron 2,3 welds arrange breach 12.

Preferably, as shown in Figure 1, the distance that the starting point of opening is also the left and right longitudinal plane of symmetry of automobile to crossbeam longitudinal plane of symmetry is B, the distance of front and back weld seam 22,21 closest approaches to crossbeam longitudinal plane of symmetry of crossbeam 1 and longeron 2 is twice B, the monolateral angle [alpha] of opening of crossbeam is not more than 1 °, angle [alpha] is the center tangent plane of crossbeam 1 and the angle of end terminal tangent plane, and generally speaking center tangent plane is exactly the skirt section at middle part.

As shown in Figure 4, the starting point that stretch downwards in the skirt section at the two ends of crossbeam 1 is B to crossbeam longitudinal plane of symmetry, the front and back weld seam of crossbeam 1 and longeron 2 is twice B to the distance of the closest approach of crossbeam longitudinal plane of symmetry, and making the downward angle beta stretching in skirt section be not less than 6.3 °, angle beta is the angle of the tangent line of ridge side at center of crossbeam 1 and the tangent line of the ridge side of the end of crossbeam 1.

As shown in Fig. 4 and Fig. 3, the length c of breach 12 on the left and right directions aperture H1 that roughly V-beam corresponding with breach 12 launches is identical.As shown in Figures 2 and 3, H1>H.

As shown in Figure 4, breach 12 tops can be arranged to 10mm with the tablet width b of skirt ends longeron 2 welding, but be not limited to this, more or a little lessly all be fine.

By the concrete numerical value of above physical dimension, the contradictory relation of coordinated balance Rigidity and strength of take is object, can there is certain adjustment according to the performance of material itself, so that crossbeam 1 both can meet rigidity needs, also can make crucial weld stress be reduced to acceptable scope.

Although the utility model with preferred embodiment openly as above, it is not for limiting the utility model, and any those skilled in the art, within not departing from spirit and scope of the present utility model, can make possible change and modification.Therefore, every content that does not depart from technical solutions of the utility model, any modification, equivalent variations and the modification above embodiment done according to technical spirit of the present utility model, within all falling into the protection domain that the utility model claim defines.

Claims

1. torsion beam back axle, has crossbeam and longeron, and crossbeam is opening V-beam, it is characterized in that, outwards open with respect to the middle part of crossbeam in the skirt section at crossbeam two ends, and stretch downwards at the middle part of the relative crossbeam in two ends of crossbeam, and bottom, crossbeam two ends arranges breach with longitudinal beam welding place.

2. torsion beam back axle as claimed in claim 1, it is characterized in that, the distance that described starting point of opening is the left and right longitudinal plane of symmetry of automobile to crossbeam longitudinal plane of symmetry is B, the front and back weld seam of crossbeam and longeron is twice B to the distance of the closest approach of crossbeam longitudinal plane of symmetry, and the monolateral angle of opening of crossbeam is not more than 1 °.

3. torsion beam back axle as claimed in claim 1, it is characterized in that, the starting point that stretch downwards in the skirt section at the two ends of crossbeam is B to crossbeam longitudinal plane of symmetry, and the front and back weld seam of crossbeam and longeron is twice B to the distance of the closest approach of crossbeam longitudinal plane of symmetry, and the angle beta that skirt section is stretched is downwards not less than 6.3 °.

4. torsion beam back axle as claimed in claim 1, is characterized in that, the length of this breach on left and right directions is the aperture of the V-beam expansion that this breach is corresponding.