CN107310342B - Variable cross-section line hydraulic expansion tube torsion beam - Google Patents
Variable cross-section line hydraulic expansion tube torsion beam Download PDFInfo
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- CN107310342B CN107310342B CN201610261799.9A CN201610261799A CN107310342B CN 107310342 B CN107310342 B CN 107310342B CN 201610261799 A CN201610261799 A CN 201610261799A CN 107310342 B CN107310342 B CN 107310342B
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- expansion tube
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
- B60G21/02—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected
- B60G21/04—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically
- B60G21/05—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically between wheels on the same axle but on different sides of the vehicle, i.e. the left and right wheel suspensions being interconnected
- B60G21/051—Trailing arm twist beam axles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
- B60B35/02—Dead axles, i.e. not transmitting torque
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
- B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
- B60G2206/20—Constructional features of semi-rigid axles, e.g. twist beam type axles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
The invention relates to the field of vehicle parts, in particular to a torsion beam. A variable cross-section line hydraulic expansion tube torsion beam comprises a middle fixed-section, a transition section and an end connection section, wherein the cross section of the middle fixed-section is in a double-layer V shape, and the end connection section is in a tubular shape; the outer contour line of the end connecting section is longer than that of the middle fixed section; taking the installation position of the torsion beam as a reference, the projection of the central axis of the torsion beam in the horizontal direction and the projection of the central axis of the torsion beam in the vertical direction are both arc lines; and a pair of bulges is symmetrically arranged at the top of the outer side of the transition section. According to the invention, the actual stress condition of the torsion beam in the suspension is analyzed, the section shapes of all areas of the torsion beam are improved in a targeted manner, the phenomenon of stress concentration of the torsion beam is dispersed, the fatigue life of the torsion beam can be prolonged, the fatigue life of the whole suspension using the torsion beam can be prolonged, and the overall performance of a vehicle is optimized.
Description
Technical Field
The invention relates to the field of vehicle parts, in particular to a torsion beam.
Background
The torsion beam has the advantages of simple structure, small occupied space, low cost and the like, is widely applied to A-grade and A0-grade vehicles, has the biggest problem of fatigue cracking in the current development and application of the torsion beam structure, and has the biggest challenge of the torsion beam structure in terms of severe service conditions under the limit working conditions of wheel reverse jumping, turning moment reverse loading and the like, so the fatigue cracking resistance is the key of the torsion beam structure design.
In the prior art, Chinese patent CN102795071A discloses a semi-independent suspension of an automobile rear torsion beam, a reinforcement is arranged at the joint of a torsion beam and a longitudinal arm, so that the stress value of the welding area of the longitudinal arm and the torsion beam is reduced, the generation of cracks and the failure condition are avoided, but the structure increases the number of parts, and whether the stress between the torsion beam and the longitudinal arm can be effectively transferred to the reinforcement or not is further verified; chinese patent CN103522864A discloses a torsion beam rear axle beam, which comprises a beam body with a U-shaped cross section, wherein two longitudinal edges of the beam body are provided with longitudinal flanges, and two reinforcing plates are arranged on the inner side of the beam body, so that the rigidity and fatigue resistance of the whole structure are improved; chinese patent CN1946580A discloses a torsion beam suspension apparatus in which abnormal friction caused when an outer wall and an inner wall are brought into sliding contact with each other is suppressed by forming a plurality of projections on the outer wall in the axial middle portion to contact the inner wall and by making contact with each other at the projections.
The torsion beams in the prior patents are either of a stamping and welding structure or tubular torsion beams, are generally uniform in cross section shape, and are not improved according to the actual stress characteristics of the torsion beams, so that the overall performance is not optimized enough, the reliability and the service life are low, and the requirement of vehicle light weight cannot be met, and the forming process of the torsion beams is adopted.
Disclosure of Invention
The invention aims to solve the technical problem of providing a variable cross-section line hydraulic expansion tube torsion beam, which is characterized in that the actual stress condition of the torsion beam in a suspension is analyzed, the cross-section shape of each area of the torsion beam is improved in a targeted manner, the stress concentration phenomenon of the torsion beam is dispersed, the fatigue life of the torsion beam can be prolonged, the overall fatigue life of the suspension using the torsion beam can be prolonged, and the overall performance of a vehicle is optimized.
The invention is realized by the following steps: a variable cross-section line hydraulic expansion tube torsion beam is composed of a middle fixed cross-section, transition sections and end connection sections, wherein the middle fixed cross-section is located in the middle of the torsion beam, the end connection sections are symmetrically located at two ends of the torsion beam, the middle fixed cross-section and the end connection sections are in smooth transition through the transition sections, the cross section of the middle fixed cross-section is in a double-layer V shape, and the end connection sections are in a tubular shape; the length of the outer contour line of the cross section at the outermost side of the end connecting section is 15 to 25 percent longer than that of the outer contour line of the cross section of the middle fixed section; taking the installation position of the torsion beam as a reference, the projection of the central axis of the torsion beam in the horizontal direction and the projection of the central axis of the torsion beam in the vertical direction are both arc lines; and a pair of bulges is symmetrically arranged at the top of the outer side of the transition section.
The cross section of the tubular end connecting section is elliptical or rectangular.
The length of the middle fixed section is 25% -50% of the length of the whole torsion beam, and the length ratio of the transition section to the end connecting section is 1: 1-1.5.
And the gap between the inner layer V-shaped wall and the outer layer V-shaped wall in the double-layer V-shaped of the middle fixed section is less than 5 mm.
The arc radius of an arc line obtained by the projection of the central axis of the torsion beam in the horizontal direction is 1500-2000 mm.
The arc radius of an arc line obtained by the projection of the central axis of the torsion beam in the vertical direction is 1500-2000 mm.
The height of the bulge is 2-5 mm.
According to the variable cross-section line hydraulic expansion tube torsion beam, the actual stress condition of the torsion beam in the suspension is analyzed, the cross-section shape of each area of the torsion beam is improved in a targeted manner, the stress concentration phenomenon of the torsion beam is dispersed, the fatigue life of the torsion beam can be prolonged, the fatigue life of the whole suspension using the torsion beam can be prolonged, and the overall performance of a vehicle is optimized.
Drawings
FIG. 1 is a schematic perspective view of a variable cross-section line hydraulic tube expansion torsion beam according to the present invention;
FIG. 2 is a schematic view of a variable cross-section line hydraulic expansion tube torsion beam of the present invention in a top view;
FIG. 3 is a front-rear direction schematic view of a variable cross-section line hydraulic expansion tube torsion beam according to the present invention;
FIG. 4 is a schematic front view of a variable cross-section line hydraulic tube expansion torsion beam according to the present invention;
FIG. 5 is a cross-sectional view A-A of FIG. 4;
FIG. 6 is a schematic view of the position of the protrusions of the present invention;
FIG. 7a is a schematic cross-sectional view of a projection formed by an empty packet; FIG. 7b is a schematic cross-sectional view of a gap formed protrusion; the dotted line is before the protrusion is added;
FIG. 8 is a cross-sectional view B-B of FIG. 4;
FIG. 9 is a cross-sectional view C-C of FIG. 4;
FIG. 10 is a cross-sectional view D-D of FIG. 4;
in the figure: 1 middle fixed section, 2 transition section, 3 end connecting section, 11 inner layer V-shaped wall, 12 outer layer V-shaped wall, 21 bulge and 22 empty bag.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the description of the present invention, and equivalents fall within the scope of the invention defined by the appended claims.
Example 1
As shown in fig. 1, 2, 3 and 4, a variable cross-section line hydraulic expansion tube torsion beam as a part of a vehicle suspension is composed of a middle fixed-section 1, a transition section 2 and end connection sections 3, wherein the middle fixed-section 1 is located in the middle of the torsion beam, the end connection sections 3 are symmetrically located at two ends of the torsion beam, the middle fixed-section 1 and the end connection sections 3 are in smooth transition through the transition section 2, the cross section of the middle fixed-section 1 is in a double-layer V shape, and the end connection sections 3 are in a tubular shape; the length of the outer contour line of the cross section at the outermost side of the end connecting section 3 is 15% -25% longer than that of the outer contour line of the cross section of the middle fixed section 1 so as to increase the length of a welding seam in a connecting area with a longitudinal arm of the suspension, disperse stress concentration at the connecting position of the torsion beam and the longitudinal arm and improve the fatigue life of the whole suspension; the installation position of the torsion beam is taken as a reference, the projections of the central axis of the torsion beam in the horizontal direction and the vertical direction are both arc lines, and the arc-shaped arches formed in the two directions optimize the stress characteristics to increase the tilting direction of the rear suspension of the torsion beam, so that the dynamic performance is improved;
as shown in fig. 5, the gap between the inner V-shaped wall 11 and the outer V-shaped wall 12 of the double-layer V-shape of the middle constant cross-section 1 is less than 5mm, and in the case of the gap, the gap is required to be as uniform as possible.
As shown in fig. 6, a pair of protrusions 21 are symmetrically arranged at the top of the outer side of the transition section 2, in the region of the transition section 2, the stress concentration in the region is caused by the gradual lengthening of the outer contour line of the cross section, and in order to disperse the stress concentration phenomenon, in the region, the protrusions 21 on the outer wall form a convex hull to reduce the stress concentration, thereby improving the fatigue life of the torsion beam; the form of the bulge 21 can slightly increase the empty bag 22 of the transition of the inner and outer V-shaped walls to form the bulge 21 as shown in FIG. 7a, and can also slightly increase the gap between the inner and outer V-shaped walls to form the bulge 21 as shown in FIG. 7 b;
as shown in fig. 8 and 9, the cross-sectional shape of the transition section 2 is smoothly and gradually transited to the end connection section 3 shown in fig. 10, and in this embodiment, the cross-sectional shape of the tubular end connection section 3 is an ellipse or a rectangle.
In the invention, preferably, the length of the middle constant cross-section 1 is 25-50% of the length of the whole torsion beam, and the length ratio of the transition section 2 to the end connecting section 3 is 1: 1-1.5; the arc radius of an arc line obtained by projecting the central axis of the torsion beam in the horizontal direction is 1500-2000 mm; the arc radius of an arc line obtained by the projection of the central axis of the torsion beam in the vertical direction is 1500-2000 mm; the height of the bulge 21 is 2-5 mm.
The torsion beam is formed by a straight pipe through the working procedures of bending, flattening, pressing V and hydraulic bulging; the initial straight pipe piece adopts a high-frequency welded pipe, the straight pipe piece is bent through a two-sequence die to obtain the arching in the horizontal direction and the vertical direction, then the bent pipe is preformed in two sequences, the double-layer V-shaped characteristics of a middle fixed section 1 and a transition section 2 are obtained through the prepressing of the two-sequence die, the pipe is placed into a hydraulic forming die after the prepressing, the two ends are sealed, high-pressure liquid is introduced into the pipe, meanwhile, the sealing heads at the two ends push in the supplementary material, so that the pipe material is attached to the die surface of the hydraulic forming die, and the variable-section-line hydraulic expansion pipe.
Claims (7)
1. The utility model provides a variable cross section line hydraulic expansion pipe torsion beam, by middle cross section (1), changeover portion (2) and end connection section (3) constitute, middle cross section (1) of deciding is located the intermediate position of this torsion beam, end connection section (3) symmetry is located the both ends of this torsion beam, decides between cross section (1) and the end connection section (3) through changeover portion (2) smooth transition, characterized by: the cross section of the middle fixed section (1) is double-layer V-shaped, and the end connecting section (3) is tubular; the length of the outer contour line of the cross section at the outermost side of the end connecting section (3) is 15 to 25 percent longer than that of the outer contour line of the cross section of the middle fixed section (1); taking the installation position of the torsion beam as a reference, the projection of the central axis of the torsion beam in the horizontal direction and the projection of the central axis of the torsion beam in the vertical direction are both arc lines; the top of the outer side of the transition section (2) is symmetrically provided with a pair of bulges (21), and the area of the transition section (2) is formed by the bulges (21) outwards from the outer wall to form a convex hull.
2. The variable cross-section line hydraulic expansion tube torsion beam of claim 1, wherein: the cross section of the tubular end connecting section (3) is oval or rectangular.
3. The variable cross-section line hydraulic expansion tube torsion beam of claim 2, wherein: the length of the middle constant cross section (1) is 25% -50% of the length of the whole torsion beam, and the length ratio of the transition section (2) to the end connecting section (3) is 1: 1-1.5.
4. The variable cross-section line hydraulic expansion tube torsion beam as claimed in any one of claims 1 to 3, wherein: and the gap between the inner layer V-shaped wall (11) and the outer layer V-shaped wall (12) in the double-layer V-shaped of the middle fixed section (1) is less than 5 mm.
5. The variable cross-section line hydraulic expansion tube torsion beam as claimed in any one of claims 1 to 3, wherein: the arc radius of an arc line obtained by the projection of the central axis of the torsion beam in the horizontal direction is 1500-2000 mm.
6. The variable cross-section line hydraulic expansion tube torsion beam as claimed in any one of claims 1 to 3, wherein: the arc radius of an arc line obtained by the projection of the central axis of the torsion beam in the vertical direction is 1500-2000 mm.
7. The variable cross-section line hydraulic expansion tube torsion beam as claimed in any one of claims 1 to 3, wherein: the height of the bulge (21) is 2-5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610261799.9A CN107310342B (en) | 2016-04-26 | 2016-04-26 | Variable cross-section line hydraulic expansion tube torsion beam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610261799.9A CN107310342B (en) | 2016-04-26 | 2016-04-26 | Variable cross-section line hydraulic expansion tube torsion beam |
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| Publication Number | Publication Date |
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| CN107310342A CN107310342A (en) | 2017-11-03 |
| CN107310342B true CN107310342B (en) | 2020-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610261799.9A Active CN107310342B (en) | 2016-04-26 | 2016-04-26 | Variable cross-section line hydraulic expansion tube torsion beam |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108909398A (en) * | 2018-07-31 | 2018-11-30 | 重庆长安汽车股份有限公司 | A kind of torsion beam crossbeam, torsion beam assembly and automobile |
| CN110385956B (en) * | 2019-07-31 | 2024-05-14 | 天人汽车底盘（芜湖）股份有限公司 | High-performance torsion beam formed by tube stamping |
| CN111186276B (en) * | 2020-02-14 | 2020-09-25 | 江苏汤臣汽车零部件有限公司 | Process for manufacturing balanced suspension composite structure |
| CN114030334B (en) * | 2021-11-17 | 2024-07-05 | 广西汽车集团有限公司 | Closed type connecting structure, manufacturing method thereof, cross beam and vehicle |
| CN114310175A (en) * | 2021-12-28 | 2022-04-12 | 四川建安工业有限责任公司 | Closed type rear torsion beam manufacturing process based on hydraulic forming process |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4211722B2 (en) * | 2004-10-07 | 2009-01-21 | トヨタ自動車株式会社 | Torsion beam suspension system |
| KR20090055973A (en) * | 2007-11-29 | 2009-06-03 | 현대모비스 주식회사 | Torsional beam of vehicle |
| KR20100009396A (en) * | 2008-07-18 | 2010-01-27 | 현대자동차주식회사 | Coupled torsion beam axle of a vehicle |
| JP2010247694A (en) * | 2009-04-16 | 2010-11-04 | Toyota Motor Corp | Torsion beam |
| CN105216573B (en) * | 2014-06-06 | 2017-11-28 | 上海宝钢高新技术零部件有限公司 | Tubulose torsion beam and manufacturing process |
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