CN208931065U - Automobile chassis rear suspension torsion beam - Google Patents

Abstract

The utility model relates to vehicle structure technical fields, provide a kind of automobile chassis rear suspension torsion beam, including the crossbeam as made of tube stamping；The crossbeam includes cross-beam body and the end section that cross-beam body both ends are arranged in；The top of the cross-beam body has the recessed portion to lower recess along its axial direction；The length of the crossbeam is L, and the length of the end section is L1；Wherein, L1≤4%L；The change rate of any two section girth is η on the cross-beam body；Wherein, η≤1%.Automobile chassis rear suspension torsion beam described in the utility model effectively improves the stress distribution on crossbeam by the variation of section girth on control crossbeam；By the variation for controlling cross-beam body epipleural portion angle, the stress distribution on crossbeam can further be improved, it avoids changeover portion on crossbeam from region of stress concentration occur, the maximum stress on crossbeam is reduced under the conditions of same load, the maximum stress region control on crossbeam is being deformed into lesser interlude.

Description

Automobile chassis rear suspension torsion beam

Technical field

The utility model relates to vehicle structure technical field, especially a kind of automobile chassis rear suspension torsion beam.

Background technique

Automobile chassis rear suspension torsion beam is one of critical component of automobile, and main function is the upper and lower of balance left and right wheels Bounce keeps the steady of vehicle to reduce rocking for vehicle, improves vehicle roll rigidity, and then improve the stable operation of automobile Property.

Currently, there are two types of forms for torsion beam: one is V-type plate beams, using sheet metal forming, this structure ordinary circumstance A stabiliser bar is set to improve its torsion stiffness down on the axis of torsion beam, turn up additionally, due to both ends open, rear In the continuous welding process with left and right trailing arm, it is hardly formed enclosed construction with the lap weld of trailing arm, causes welding deformation, stability Poor, the discontinuity of its commissure when torsion beam works, weld seam nearby will appear stress concentration, thus to welding procedure and Welding quality it is more demanding, while in use, be easy to appear fatigue rupture, and in order to improve the reliability of product, It needs, to improve the intensity of entire torsion beam, entire production process will necessarily be made in this way in join domain extra soldered stiffening plate It is more responsible, the weight of torsion beam is increased, and then increase cost.Another kind is tube stamping formula, using round tube punch forming, Its section is also V-type, and relative to V-type plate beam punching type crossbeam, this structure has the characteristics that structure is simple, light-weight, can be big Width reduces the weight of crossbeam, improves the comfort of vehicle.

Existing tube stamping formula torsion girder construction is generally divided into three sections, including intermediate straight section, changeover portion and end are straight Section realizes the connection of intermediate straight section and end straight section by changeover portion.Since intermediate straight section and end straight section are cross-section knot Structure, the cross section of intermediate straight section are V-type, and the cross section of end straight section is rectangle, while the length of intermediate straight section is total equal to crossbeam The half of length.Therefore, the torsion beam of this structure can change on changeover portion in the presence of 20% or so perimeter of section, make crossbeam Stress is generated at changeover portion to concentrate；In use, torsion beam is easy occur fatigue rupture at changeover portion；And in order to mention The reliability of high product then needs to increase the thickness of entire crossbeam, and which not only adds the weight of entire crossbeam, and can make It is superfluous at material most of in intermediate straight section, reduce the utilization rate of material.

Utility model content

The technical problem to be solved by the utility model is to provide a kind of automobile chassis rear suspension torsion beams, can effectively change Stress distribution on kind crossbeam.

The technical scheme adopted by the utility model to solve the technical problem is as follows: automobile chassis rear suspension torsion beam, including The crossbeam as made of tube stamping；The crossbeam includes cross-beam body and the end section that cross-beam body both ends are arranged in；The cross The top of beam ontology has the recessed portion to lower recess along its axial direction；The length of the crossbeam is L, and the length of the end section is L1；Wherein, L1≤4%L；The change rate of any two section girth is η on the cross-beam body；Wherein, η≤1%.

Further, the cross-beam body includes three sections along its axial direction, is interlude respectively, is set to interlude and end section Between changeover portion；The length of the interlude is L2；Wherein, L2≤20%L；The cross-beam body include upper wall, lower wall with And two arc connection walls between upper wall and lower wall；The upper wall includes the first middle part, is set to the first middle part two First side plate of side；Two the first side plates upwardly extend and open-shaped；The lower wall includes the second middle part, is set to Second side plate of the second middle part two sides；Two the second side plates upwardly extend and open-shaped；First side plate and The upper end of second side plate is connected by arc connection wall；On the cross section of each changeover portion of the cross-beam body, two The angle between angle and two the second side plates between first side plate along direction from changeover portion outer end to inner end gradually Reduce.

Further, the angle between two the first side plates on the cross section of the changeover portion outer end is α；Wherein, 60 ° α≤100 ° <；The angle between two the second side plates on the cross section of the changeover portion outer end is β；Wherein, 60 ° of < β≤ 100°。

Further, the angle between two the first side plates on the cross section of the changeover portion inner end is γ, wherein 45°≤γ≤75°；The angle between two the second side plates on the cross section of the changeover portion inner end is θ, wherein 45 °≤θ ≤75°。

Further, on the cross section of each changeover portion of the cross-beam body, the radius edge of the arc connection wall Changeover portion outer end is gradually reduced to the direction of inner end.

Further, the least radius of the arc connection wall inner surface is 1~5 times of cross-beam body wall thickness.

Further, first middle part is downward projection of arc structure；Second middle part is to be downwardly projected Arc structure.

Further, on the cross section of each changeover portion of the cross-beam body, the first intermediate lower surface Height between extreme lower position and the extreme lower position of the second middle part upper surface gradually subtracts along changeover portion outer end to the direction of inner end It is small.

The beneficial effects of the utility model are: automobile chassis rear suspension torsion beam described in the utility model, by cross Recessed portion is arranged in the top of beam ontology, increases the rigidity of crossbeam；Pass through any two section girth on control cross-beam body Change rate≤1%, reduce the plastic deformation of tubing in a thickness direction, effectively improve the stress distribution on crossbeam；It is logical The variation for crossing control cross-beam body epipleural portion angle, can further improve the stress distribution on crossbeam, avoid transition on crossbeam There is region of stress concentration in section.Compared with traditional torsion beam, under the conditions of same load, the torsion beam of the utility model can not only The maximum stress on crossbeam is reduced, the maximum stress region control on crossbeam is being deformed into lesser interlude；And it can reduce 10% or more weight improves the utilization rate of material.

Detailed description of the invention

Fig. 1 is the main view of the utility model；

Fig. 2 is A-A cross-sectional view in Fig. 1；

Fig. 3 is B-B cross-sectional view in Fig. 1；

Fig. 4 is C-C cross-sectional view in Fig. 1；

Fig. 5 is D-D cross-sectional view in Fig. 1；

Fig. 6 is the stress envelope of 1 middle cross beam of comparative example；

Fig. 7 is the stress envelope of 1 middle cross beam of embodiment；

Fig. 8 is the stress envelope of 2 middle cross beam of embodiment.

Appended drawing reference in figure are as follows: 1- crossbeam, 2- cross-beam body, the end 3- section, 4- upper wall, 5- lower wall, 6- arc connection wall, 21- interlude, 22- changeover portion, the first middle part of 41-, the first side plate of 42-, the second middle part of 51-, the second side plate of 52-.

Specific embodiment

The present invention will be further described with reference to the accompanying drawings and examples:

As shown in Figures 1 to 5, automobile chassis rear suspension torsion beam described in the utility model, including by tube stamping and At crossbeam 1；The crossbeam 1 includes cross-beam body 2 and the end section 3 that 2 both ends of cross-beam body are arranged in；It is characterized by: institute The top for stating cross-beam body 2 has recessed portion to lower recess along its axial direction；The length of the crossbeam 1 is L, the end section 3 Length be L1；Wherein, L1≤4%L；The change rate of any two section girth is η on the cross-beam body 2；Wherein, η ≤ 1%.

As shown in Figure 1, the crossbeam 1 is integrated, formed by tube stamping；The tubing can be seamless steel pipe, It can be welded still pipe.The crossbeam 1 includes cross-beam body 2 and the end section 3 that 2 both ends of cross-beam body are arranged in；The end The 4% of 1 total length of length≤crossbeam of section 3, makes cross-beam body 2 be primarily subjected to external load；The end section 3 is used for and trailing arm The cross section of connection, end section 3 is ellipse, circle, round rectangle or the fillet trapezoid matched with actual demand.

The cross section refers to the section perpendicular to 1 axis of crossbeam.It is recessed by being arranged at the top of cross-beam body 2 Concave portion keeps the cross section of cross-beam body 2 substantially v-shaped or U-shaped, as shown in Figures 3 to 5, increases the rigidity of crossbeam 1.Pass through Change rate≤1% for controlling any two section girth on cross-beam body 2, so that tubing in punching course, subtracts as far as possible The plastic deformation of education and correction for juvenile offenders material in a thickness direction, effectively improves the stress distribution on crossbeam 1, reduce tubing be stretched and The influence of compressing force, avoid existing torsion beam need to be heat-treated etc. techniques eliminate caused by internal stress complex process and at Originally increase.

The cross-beam body 2 includes three sections along its axial direction, be respectively interlude 21, be set to interlude 21 and end section 3 it Between changeover portion 22；The length of the interlude 21 is L2；Wherein, L2≤20%L；The cross-beam body 2 include upper wall 4, under Wall 5 and two arc connection walls 6 between upper wall 4 and lower wall 5；The upper wall 4 includes the first middle part 41, is set to the First side plate 42 of one middle part, 41 two sides；Two the first side plates 42 upwardly extend and open-shaped；The lower wall 5 wraps Include the second middle part 51, the second side plate 52 set on 51 two sides of the second middle part；Two the second side plates 52 upwardly extend, simultaneously It is open-shaped；The upper end of first side plate 42 and the second side plate 52 is connected by arc connection wall 6；In the crossbeam sheet On the cross section of each changeover portion 22 of body 2, between the angle and two the second side plates 52 between two the first side plates 42 Angle be gradually reduced along 22 outer end of changeover portion to the direction of inner end.

The cross-beam body 2 includes upper wall 4, lower wall 5 and two arc connection walls between upper wall 4 and lower wall 5 6.The lower wall 5 is set to the lower section of upper wall 4, realizes the rounding off between upper wall 4 and lower wall 5 by arc connection wall 6, can It avoids crossbeam 1 from rupturing in torsion, achievees the purpose that the intensity and torsion stiffness of reinforcing torsion beam.The cross-beam body 2 It is interlude 21, the changeover portion 22 between interlude 21 and end section 3 respectively along axial including three sections.The interlude 21 can be cross-section section, be also possible to variable cross-section section；The changeover portion 22 is variable cross-section section.The outer end of the changeover portion 22 refers to Be with 3 end that connect of end section, the inner end of changeover portion 22 refers to the end connecting with interlude 21.

As shown in Figures 3 to 5, the cross section of the upper wall 4 is substantially v-shaped or U-shaped.The upper wall 4 includes among first Portion 41, the first side plate 42 set on 41 two sides of the first middle part.First middle part 41 is downward projection of arc structure, And then realize the rounding off between two the first side plates 42, avoid crossbeam 1 from rupturing in torsion.Two the first side plates Portion 42 upwardly extends and open-shaped, refers to that the lower end of two the first side plates 42 is connect with the first middle part 41, and two The distance between 42 upper end of side plate portion is greater than the distance between its lower end.

The cross section of the lower wall 5 is substantially v-shaped or U-shaped.The lower wall 5 includes the second middle part 51, is set in second Between 51 two sides of portion the second side plate 52.Second middle part 51 is downward projection of arc structure, and then realizes two the Rounding off between two side plates 52 avoids crossbeam 1 from rupturing in torsion.Two the second side plates 52 upwardly extend, And it is open-shaped, refer to that the lower end of two the second side plates 52 is connect with the second middle part 51, on two the second side plates 52 The distance between end is greater than the distance between its lower end.

On each changeover portion 22 of the cross-beam body 2: in the cross section of changeover portion 22, two the first side plates 42 it Between angle be gradually reduced along 22 outer end of changeover portion to the direction of inner end, the angle between two the second side plates 52 is along changeover portion 22 outer ends are gradually reduced to the direction of inner end, the radius of the arc connection wall 6 along direction from 22 outer end of changeover portion to inner end by Decrescence small, between the extreme lower position of 51 upper surface of extreme lower position and the second middle part of 41 lower surface of the first middle part height Degree is gradually reduced along 22 outer end of changeover portion to the direction of inner end.

On the interlude 21 of the cross-beam body 2: when interlude 21 is cross-section section, 21 cross section of interlude Shape and size axially retain constant along it, preferably, the shape and size of the cross section of interlude 21 and changeover portion 22 The shape and size of inner end cross section are identical.When interlude 21 is variable cross-section section, in the cross section of interlude 21, two first Radius, the first middle part 41 of the angle between angle, two the second side plates 52, arc connection wall 6 between side plate 42 Height between the extreme lower position of 51 upper surface of the extreme lower position of lower surface and the second middle part along the both ends of interlude 21 to The direction in centre is gradually reduced.

The least radius of 6 inner surface of arc connection wall of the cross-beam body 2 is 1~5 times of 2 wall thickness of cross-beam body, is made For preferred embodiment, the least radius of 6 inner surface of arc connection wall is 2~3 times of 2 wall thickness of cross-beam body.Outside the changeover portion 22 Holding the angle between two the first side plates 42 on cross section is α；Wherein, 60 °≤α≤100 °；Preferably, 70 °≤α≤ 80°.The angle between two the second side plates 52 on the 22 outer end cross section of changeover portion is β；Wherein, 60 °≤β≤ 100°；Preferably, 70 °≤α≤90 °.The folder between two the first side plates 42 on the 22 inner end cross section of changeover portion Angle is γ；Wherein, 45 °≤γ≤75 °；Preferably, 55 °≤γ≤65 °.Two on the 22 inner end cross section of changeover portion Angle between second side plate 52 is θ；Wherein, 45 °≤θ≤75 °；Preferably, 55 °≤θ≤65 °.

The crossbeam 1 can be straight crossbeam, can also there is certain radian axially and or radially.The crossbeam 1 can be Unsymmetric structure, can also be with integrated symmetric.When crossbeam 1 is integrated symmetric, with the cross section at the 21 midpoint position of interlude The plane at place is first plane of reference, and the crossbeam 1 is symmetrical about first plane of reference；To pass through the 21 midpoint position of interlude The minimum point of cross section and perpendicular to the plane of first plane of reference be second plane of reference, the crossbeam 1 is about second plane of reference pair Claim.

Automobile chassis rear suspension torsion beam described in the utility model, by the way that the first middle part 41 is arranged in changeover portion 22 Height between the extreme lower position of 51 upper surface of the extreme lower position of lower surface and the second middle part is along 22 outer end of changeover portion to inner end Direction be gradually reduced, make the upper wall 4 of cross-beam body 2 without contacting or being adjacent to lower wall 5 by being excessively recessed, not only favorably The material needed for saving upper wall 4 achievees the purpose that can reduce 1 weight of crossbeam, and can be realized the cross section of crossbeam 1 by Ellipse, circle, round rectangle or the fillet trapezoid of end section 3 are seamlessly transitted to the V-arrangement or U-shaped of changeover portion 22.Pass through control The variation of the side plate angle, 6 radius of arc connection wall of changeover portion 22, effectively improves the stress distribution on crossbeam 1, avoids There is region of stress concentration in the changeover portion 22 of crossbeam 1, improves the reliability of torsion beam.With existing closed torsion beam phase Than under the conditions of same load, the torsion beam of the utility model can reduce the maximum stress on crossbeam 1, by the maximum on crossbeam 1 Stress area control deforms on lesser interlude 21 in crossbeam 1.

Comparative example 1:

1 length of crossbeam is L, and end 3 length of section are L1, and 21 length of interlude is L2；Wherein, L1=4%L, L2=50% L；There are the variations of 20% section girth on changeover portion 22.

Embodiment 1:

1 length of crossbeam is L, and end 3 length of section are L1, and 21 length of interlude is L2；Wherein, L1=4%L, L2=20% L；Change rate η≤1% of any two section girth on cross-beam body 2；Interlude 21 is cross-section section, the cross of interlude 21 Sectional dimension is identical as the size of 22 inner end cross section of changeover portion；Two the first side plates 42 on 22 outer end cross section of changeover portion Between angle α=80 °；Angle β=80 ° between two the second side plates 52 on 22 outer end cross section of changeover portion；Transition Angle γ=58 ° between two the first side plates 42 on 22 inner end cross sections of section；Two on 22 inner end cross section of changeover portion Angle theta=58 ° between second side plate 52.

Embodiment 2:

1 length of crossbeam is L, and end 3 length of section are L1, and 21 length of interlude is L2；Wherein, L1=4%L, L2=20% L；Change rate η≤1% of any two section girth on cross-beam body 2；Interlude 21 is variable cross-section section, on cross-beam body 2 Two the first side plates 42 between angle, the angle between two the second side plates 52 is along 22 outer end of changeover portion to centre The direction at 21 midpoint positions of section is gradually reduced.Wherein, between two the first side plates 42 on 22 outer end cross section of changeover portion Angle α=80 °；Angle β=80 ° between two the second side plates 52 on 22 outer end cross section of changeover portion；Interlude 21 The angle between two the first side plates 42 on the cross section of midpoint position is 58 °；On the midpoint position cross section of interlude 21 Two the second side plates 52 between angle be 58 °.

It is modeled respectively according to the structure of 1 middle cross beam 1 of above-described embodiment 1, embodiment 2 and comparative example, after the completion of modeling, Under identical load-up condition, stress analysis is carried out to the crossbeam 1 in embodiment 1, embodiment 2 and comparative example 1, analysis result is such as Under:

Comparative example 1:

Fig. 6 is the stress envelope of 1 middle cross beam 1 of comparative example；From fig. 6 it can be seen that the maximum stress on crossbeam 1 is 944.3MPa, and the maximum stress on crossbeam 1 is on changeover portion 22.

Embodiment 1:

Fig. 7 is the stress envelope of 1 middle cross beam 1 of embodiment；It can be seen from figure 7 that the maximum stress on crossbeam 1 is 520.1MPa, and the maximum stress on crossbeam 1 is on interlude 21.

Embodiment 2:

Fig. 8 is the stress envelope of 2 middle cross beam 1 of embodiment；As can be seen from Figure 8, the maximum stress on crossbeam 1 is 520.1MPa, and the maximum stress on crossbeam 1 is on interlude 21.

From the foregoing, it will be observed that automobile chassis rear suspension torsion beam described in the utility model can improve under the conditions of same load Stress distribution on crossbeam 1 avoids the changeover portion 22 of crossbeam 1 from region of stress concentration occur；Under the conditions of same load, it can reduce Maximum stress on crossbeam 1, while the control of the stress maximum region of crossbeam 1 being deformed on lesser interlude 21 on crossbeam 1, Improve the reliability of torsion beam.

Claims (8)

1. automobile chassis rear suspension torsion beam, including the crossbeam as made of tube stamping (1)；The crossbeam (1) includes crossbeam sheet Body (2) and setting cross-beam body (2) both ends end section (3)；It is characterized by: the top of the cross-beam body (2) is along it The axial recessed portion having to lower recess；The length of the crossbeam (1) is L, and the length of the end section (3) is L1；Wherein, L1 ≤ 4%L；The change rate of any two section girth is η on the cross-beam body (2)；Wherein, η≤1%.

2. automobile chassis rear suspension torsion beam according to claim 1, it is characterised in that: the cross-beam body (2) is along it Axial includes three sections, is interlude (21), the changeover portion (22) between interlude (21) and end section (3) respectively；It is described The length of interlude (21) is L2；Wherein, L2≤20%L；The cross-beam body (2) includes upper wall (4), lower wall (5) and sets Two arc connection walls (6) between upper wall (4) and lower wall (5)；

The upper wall (4) includes the first middle part (41), the first side plate (42) for being set to the first middle part (41) two sides；Two First side plate (42) upwardly extends and open-shaped；The lower wall (5) includes the second middle part (51), is set among second Second side plate (52) of portion (51) two sides；Two the second side plates (52) upwardly extend and open-shaped；First side plate Portion (42) and the upper end of the second side plate (52) are connected by arc connection wall (6)；

Angle on the cross section of each changeover portion (22) of the cross-beam body (2), between two the first side plates (42) Angle between two the second side plates (52) is gradually reduced along changeover portion (22) outer end to the direction of inner end.

3. automobile chassis rear suspension torsion beam according to claim 2, it is characterised in that: changeover portion (22) outer end is horizontal The angle between two the first side plates (42) on section is α；Wherein, 60 ° of α≤100 ° <；Changeover portion (22) outer end The angle between two the second side plates (52) on cross section is β；Wherein, 60 ° of β≤100 ° <.

4. automobile chassis rear suspension torsion beam according to claim 2 or 3, it is characterised in that: in the changeover portion (22) Holding the angle between two the first side plates (42) on cross section is γ；Wherein, 45 °≤γ≤75 °；The changeover portion (22) The angle between two the second side plates (52) on the cross section of inner end is θ；Wherein, 45 °≤θ≤75 °.

5. automobile chassis rear suspension torsion beam according to claim 2 or 3, it is characterised in that: in the cross-beam body (2) Each changeover portion (22) cross section on, the radius of the arc connection wall (6) is along changeover portion (22) outer end to the side of inner end To being gradually reduced.

6. automobile chassis rear suspension torsion beam according to claim 2 or 3, it is characterised in that: the arc connection wall (6) The least radius of inner surface is 1~5 times of cross-beam body (2) wall thickness.

7. automobile chassis rear suspension torsion beam according to claim 2 or 3, it is characterised in that: first middle part It (41) is downward projection of arc structure；Second middle part (51) is downward projection of arc structure.

8. automobile chassis rear suspension torsion beam according to claim 7, it is characterised in that: in the cross-beam body (2) On the cross section of each changeover portion (22), in the extreme lower position of the first middle part (41) lower surface and the second middle part (51) Height between the extreme lower position on surface is gradually reduced along changeover portion (22) outer end to the direction of inner end.