CN112440638A - 1500 Mpa-grade anti-fatigue electric taxi torsion beam - Google Patents
1500 Mpa-grade anti-fatigue electric taxi torsion beam Download PDFInfo
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- CN112440638A CN112440638A CN202011325439.3A CN202011325439A CN112440638A CN 112440638 A CN112440638 A CN 112440638A CN 202011325439 A CN202011325439 A CN 202011325439A CN 112440638 A CN112440638 A CN 112440638A
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- torsion beam
- cross
- welded
- electric taxi
- longitudinal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G7/00—Pivoted suspension arms; Accessories thereof
- B60G7/001—Suspension arms, e.g. constructional features
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G13/00—Resilient suspensions characterised by arrangement, location or type of vibration dampers
- B60G13/001—Arrangements for attachment of dampers
- B60G13/005—Arrangements for attachment of dampers characterised by the mounting on the axle or suspension arm of the damper unit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G7/00—Pivoted suspension arms; Accessories thereof
- B60G7/006—Attaching arms to sprung or unsprung part of vehicle, characterised by comprising attachment means controlled by an external actuator, e.g. a fluid or electrical motor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
The invention discloses a 1500 Mpa-grade anti-fatigue electric taxi torsion beam which is of a semi-arc symmetrical structure as a whole and comprises a cross beam (1), a longitudinal arm (2), a reinforcing plate (3), a sleeve (4), a spring tray (5), a shock absorber support (6), an end plate (7), a wheel-side support (8) and a lining (9); longitudinal arms (2) are respectively welded at two ends of the cross beam (1), and reinforcing plates (3) are arranged at the welding positions of the cross beam and the longitudinal arms (2); the top end of the longitudinal arm (2) is welded and fixed with the sleeve (4); the end plate (7) is connected with the outer side of the longitudinal arm (2) through a wheel edge bracket (8); the spring tray (5) is welded on the inner side of the longitudinal arm (2); the shock absorber support (6) is welded between the trailing arm (2) and the spring tray (5); the torsion beam bushing (9) is arranged in the bushing (9); the beam (1) is a closed tubular beam stamping structure with a uniform cross section and a long periphery.
Description
Technical Field
The invention relates to the field of design and manufacture of a passenger car torsion beam, belongs to the field of passenger car chassis parts, and particularly relates to a 1500 Mpa-grade anti-fatigue electric taxi torsion beam.
Background
Passenger car suspension divide into independent suspension, non-independent suspension and half independent suspension, and the torsion beam is exactly a half independent suspension, uses a very general structure in A level car rear suspension, and its advantage lies in: simple structure is favorable to increasing the trunk volume, characteristics such as low in manufacturing cost. For a torsion beam of a passenger car, particularly an electric taxi, the carrying requirement is high, the running condition is complex and severe in operation, and the following problems can be generally caused:
1. insufficient fatigue resistance; the torsion beam main body generally comprises a cross beam and two longitudinal arms, the two longitudinal arms are respectively welded at two ends of the cross beam, under a common torsion working condition, namely under a reverse wheel jump working condition, fatigue fracture is most easily caused at the position of the cross beam body close to the longitudinal arms and at the position of a lap joint of the cross beam and the longitudinal arms, the safety of a vehicle and the fatigue resistance service life of the torsion beam can be seriously influenced, and the subsequent maintenance cost is higher;
2. the torsion beam is designed to be heavy, so that unsprung mass is increased, the stability and the smoothness of a vehicle are influenced, and the material cost of the torsion beam is increased;
in conclusion, for the electric taxi, the electric taxi has complex and severe driving conditions and high bearing requirements, and a special structure needs to be designed for the torsion beam, so that the fatigue resistance can be met, and the requirements on light weight and low cost can be met.
Disclosure of Invention
The invention provides a 1500 Mpa-grade anti-fatigue electric taxi torsion beam which can meet the requirements of fatigue resistance, light weight and low cost of an electric taxi under special operation conditions.
The technical scheme of the invention is described as follows by combining the attached drawings:
a1500 Mpa-grade anti-fatigue electric taxi torsion beam is of a semi-arc symmetrical structure integrally and comprises a cross beam 1, a longitudinal arm 2, a reinforcing plate 3, a sleeve 4, a spring tray 5, a shock absorber support 6, an end plate 7, a wheel-side support 8 and a lining 9; longitudinal arms 2 are respectively welded at two ends of the cross beam 1, and reinforcing plates 3 are arranged at the welding positions of the cross beam and the longitudinal arms 2; the top end of the longitudinal arm 2 is welded and fixed with the sleeve 4; the end plate 7 is connected with the outer side of the longitudinal arm 2 through a wheel edge bracket 8; the spring tray 5 is welded on the inner side of the trailing arm 2; the shock absorber bracket 6 is welded between the trailing arm 2 and the spring tray 5; the torsion beam bushing 9 is installed in the bushing 9; the beam 1 is a closed tubular beam stamping structure with a uniform cross section and a long circumference.
Preferably, the cross-sectional shape of the beam 1 smoothly transitions from a V-shaped section at the middle to an elliptical section at both ends.
Preferably, the beam 1 is formed by performing and shaping two stamping processes, and after stamping, a partitioned high-frequency quenching process is adopted.
Further, in the lap joint area of the two ends of the cross beam 1 and the longitudinal arm, the cross beam 1 adopts a low-heat-input high-frequency quenching process.
Preferably, a fillet-variable reinforcing rib penetrates through the middle of the reinforcing plate 3, and the cross section of the reinforcing rib is wide at two ends and narrow in the middle.
Preferably, two elbow radii are arranged on the central axis of the trailing arm 2.
Preferably, the trailing arm 2 is provided with a protruding portion which overlaps and is welded to the sleeve.
In conclusion, the beneficial effects of the invention are as follows:
the torsion beam meets the high bearing requirement of the electric taxi under the complex and severe running working conditions, can meet the bearing requirement of the rear axle load of 1250Kg to the maximum extent, and covers the common bearing requirement of passenger cars;
the fatigue resistance service life of the torsion beam of the electric taxi is 60 kilometers equivalent to that of a user through system bench test, 24-channel test of the whole taxi and road test of a Hainan real vehicle;
the beam adopts a closed tubular beam punching structure with a uniform cross section, and internal stress distribution and external stress distribution under a torsion working condition in beam punching forming are optimized through special beam cross section design, so that the fatigue cracking risk under the common torsion working condition of the beam is reduced; in addition, the cross beam adopts a high-frequency quenching process, so that the tensile strength of the material of the cross beam body reaches more than 1500Mpa, the stress resistance of the cross beam is greatly improved, and the fatigue cracking risk under the torsional working condition of the cross beam is further reduced;
according to the invention, through the design of a beam equal-section closed tube beam stamping structure, the design of a reinforcing plate semi-arc structure and the design of extending a longitudinal arm to a sleeve, on the premise of meeting the requirements of large bearing capacity and high fatigue resistance, the lightweight design is realized, the weight of a torsion beam welding assembly after coating is 27Kg, the weight is about 2Kg less than that of a common torsion beam in the same level, the material cost is saved, and the endurance mileage of the electric taxi is increased to a certain extent;
drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a schematic view of a 1500MPa class fatigue-resistant electric taxi torsion beam
FIG. 2 is a sectional view of the cross-sectional positions in FIG. 1
FIG. 3 is a schematic view of a stiffener structure according to the present invention
FIG. 4 is a sectional view of the cross-sectional positions of FIG. 3
FIG. 5 is a schematic view of a reinforcing structure of the trailing arm and the sleeve according to the present invention
FIG. 6 bottom view of the inventive structure
FIG. 7 is an isometric view of the mechanism of the present invention
In the figure:
1-a cross beam; 2-a trailing arm; 3-a reinforcing plate; 4-a sleeve; 5-a spring tray; 6-a shock absorber support; 7-an end plate; 8-wheel edge support; 9-lining.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Referring to fig. 1-7, a 1500Mpa level anti-fatigue electric taxi torsion beam, which is a semi-arc symmetrical structure as a whole, comprises a beam 1, a trailing arm 2, a reinforcing plate 3, a sleeve 4, a spring tray 5, a shock absorber support 6, an end plate 7, a wheel edge support 8 and a bushing 9; longitudinal arms 2 are respectively welded at two ends of the cross beam 1, and reinforcing plates 3 are arranged at the welding positions of the cross beam and the longitudinal arms 2; the top end of the longitudinal arm 2 is welded and fixed with the sleeve 4; the end plate 7 is connected with the outer side of the longitudinal arm 2 through a wheel edge bracket 8; the spring tray 5 is welded on the inner side of the trailing arm 2; the shock absorber bracket 6 is welded between the trailing arm 2 and the spring tray 5; the torsion beam bushing 9 is installed in the bushing 9; the beam 1 is a closed tubular beam stamping structure with a uniform cross section and a long circumference.
Preferably, the cross-sectional shape of the beam 1 smoothly transitions from a V-shaped section at the middle to an elliptical section at both ends.
Preferably, the beam 1 is formed by performing and shaping two stamping processes, and after stamping, a partitioned high-frequency quenching process is adopted.
Further, in the lap joint area of the two ends of the cross beam 1 and the longitudinal arm, the cross beam 1 adopts a low-heat-input high-frequency quenching process.
Preferably, a fillet-variable reinforcing rib penetrates through the middle of the reinforcing plate 3, and the cross section of the reinforcing rib is wide at two ends and narrow in the middle.
Preferably, two elbow radii are arranged on the central axis of the trailing arm 2.
Preferably, the trailing arm 2 is provided with a protruding portion which overlaps and is welded to the sleeve.
Examples
Referring to fig. 1-7, a 1500Mpa level anti-fatigue electric taxi torsion beam comprises a cross beam 1, a longitudinal arm 2, a reinforcing plate 3, a sleeve 4, a spring tray 5, a shock absorber support 6, an end plate 7, a wheel edge support 8 and a bushing 9.
The structure of the torsion beam cross beam 1 directly affects the vehicle dynamics and fatigue resistance, so the cross beam 1 is a core part of the torsion beam. The cross beam 1 is of a closed tubular beam punching structure with a uniform cross section and a circumferential length, and a common transverse stabilizer bar is omitted. Through the special cross-section design of the cross beam, the internal stress distribution of the cross beam in stamping and forming and the external stress distribution of the cross beam under the torsion working condition are optimized, so that the fatigue cracking risk of the cross beam under the common torsion working condition is reduced. The section change of the beam 1 is shown in the attached drawing 2, as can be seen from the attached drawing 2, the section shape of the beam 1 is gradually changed from a V-shaped section at the middle A-A to an elliptical section at the end G-G, and through Adams dynamic simulation analysis, the structure completely meets the requirements of dynamic torsional rigidity, high side-tipping center and the like in performance; the common failure condition of torsion beam is the torsion operating mode, and this operating mode can make 1 end position of crossbeam produce the external stress concentration, through 1 special cross-sectional design of crossbeam, has reduced the external stress concentration that the torsion operating mode produced on crossbeam 1 from the structure to the fatigue resistance of crossbeam 1 has been promoted.
In terms of manufacturing, the process and the procedure arrangement adopted by the beam 1 are as follows: stamping forming → high-frequency quenching → tempering → shot blasting → laser cutting; the cross beam 1 is designed by adopting a special uniform section circumference, a closed tube stamping forming process is adopted in the process, the forming can be completed only by two stamping processes of preforming and shaping, and through the Autoform forming simulation calculation, the cross beam 1 forms better stress distribution and smaller stamping internal stress concentration in the forming process, so that the fatigue cracking risk of the cross beam 1 is further reduced.
After the beam 1 is stamped and formed, a subarea high-frequency quenching process is adopted, parameters such as position, speed and power of a high-frequency quenching coil are adjusted, a high-heat input quenching process strategy is adopted in the middle area of the beam 1 body, the structure is completely martensitic, the external stress concentration position generated by the beam 1 body under a common torsion working condition is realized, and the tensile strength of the material reaches more than 1500 Mpa; the strength of the material is improved through high-frequency quenching, the anti-stress capability of the beam is greatly improved, and the fatigue cracking risk of the beam under the torsion working condition is further reduced.
In the lap joint area of the two ends of the beam 1 and the longitudinal arm, the beam 1 adopts a high-frequency quenching process strategy with low heat input, so that the end of the beam 1 is prevented from generating transitional hardenability, and at the moment, if the end of the beam 1 is welded with the longitudinal arm 2, serious welding internal stress and thermal embrittlement can be caused, and further the fatigue cracking of the welding seam of the beam 1 and the longitudinal arm 2 is caused; in order to solve the problem, a special reinforcing plate 3 needs to be designed to connect the longitudinal arm 2 and the transverse beam 1, so that the stress at the lap welding seam of the transverse beam 1 and the longitudinal arm 2 is dispersed, and the detailed description is shown in the attached drawing 3. The common reinforcing structure is that the spring tray 5 extends to the cross beam 1 and is welded, and even a reinforcing plate for connecting the trailing arm and the cross beam is additionally added on the basis of the common reinforcing structure, so that the torsion beam is designed to be heavier. The torsion beam reinforcing plate 3 adopts a semi-arc special structure, and lap welding seams of the torsion beam reinforcing plate and the cross beam 1 and the longitudinal arm 2 are vertically arranged, and the details are shown in an attached drawing 3. A R12-R14 fillet-variable reinforcing rib penetrates through the middle of the reinforcing plate 3, the two ends of the section of the reinforcing rib are wide, the middle of the section of the reinforcing rib is narrow, and the section of the reinforcing plate 3 is shown in the attached drawing 4 in detail; the weight of the left and right reinforcing plates 3 is only 0.24Kg, which is about 0.7Kg lighter than the weight of the common reinforcing structure; the reinforcing plate 3 reasonably disperses the stress at the lap welding seam of the cross beam 1 and the longitudinal arm 2 through the special section design, thereby reducing the fatigue cracking risk of the lap welding seam of the cross beam 1 and the longitudinal arm 2.
The trailing arm 2 is a welding foundation of other parts of the torsion beam and is an important force transmission part of the torsion beam, the trailing arm 2 selects a pipe diameter and a thickness with a better bending-resistant section coefficient, two bent pipe radiuses are arranged on the central axis of the trailing arm 2, and a pipe stamping forming process is adopted. Considering that the electric taxi has frequent braking and can generate larger and high-frequency longitudinal force to be applied to the torsion beam under the condition of accelerating running, and the fatigue cracking of the lap joint of the welding seam of the longitudinal arm 2 and the sleeve 4 of the torsion beam can be accelerated; since the diameter of the torsion beam sleeve 4 is larger than that of the trailing arm 2, if the length of the direct lap weld can only cover about 1/3 of the circumference of the sleeve 4, a large stress concentration can be generated on the upper weld of the sleeve 4 under the working condition of longitudinal force. To solve this problem, the longitudinal arm 2 is extended and reinforced, and the shape of the extended rectangular part of the longitudinal arm 2 is not limited to rectangular overlapping and welding with the sleeve, and the length of the overlapping welding seam covers about 1/2 of the circumference of the sleeve 4, as shown in fig. 5. The longitudinal arm 2 extends to strengthen the structure, and the external stress distribution of the lap joint of the longitudinal arm 2 and the sleeve 4 under the working condition of longitudinal force of the torsion beam is optimized, so that the fatigue cracking risk of the torsion beam under the working conditions of high-frequency braking and acceleration is reduced.
The end plate 7 adopts a flat plate stamping structure, and two end faces after welding are specially machined.
The wheel edge bracket 8 is connected with the longitudinal arm 2 and the end plate 7; the spring tray 5 is directly welded with the trailing arm 2; the shock absorber bracket 6 is respectively welded with the trailing arm 2 and the spring tray 5; the sleeve 4 is used to mount the torsion beam bushing 9.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The 1500 Mpa-grade anti-fatigue electric taxi torsion beam is characterized in that the whole torsion beam is of a semi-arc symmetrical structure and comprises a cross beam (1), a longitudinal arm (2), a reinforcing plate (3), a sleeve (4), a spring tray (5), a shock absorber support (6), an end plate (7), a wheel-side support (8) and a lining (9); longitudinal arms (2) are respectively welded at two ends of the cross beam (1), and reinforcing plates (3) are arranged at the welding positions of the cross beam and the longitudinal arms (2); the top end of the longitudinal arm (2) is welded and fixed with the sleeve (4); the end plate (7) is connected with the outer side of the longitudinal arm (2) through a wheel edge bracket (8); the spring tray (5) is welded on the inner side of the longitudinal arm (2); the shock absorber support (6) is welded between the trailing arm (2) and the spring tray (5); the torsion beam bushing (9) is arranged in the bushing (9); the beam (1) is a closed tubular beam stamping structure with a uniform cross section and a long periphery.
2. The 1500Mpa class fatigue-resistant electric taxi torsion beam, according to claim 1, wherein the cross beam (1) has a cross-sectional shape that smoothly transitions from a V-shaped section at the middle to an elliptical section at both ends.
3. The 1500Mpa class fatigue-resistant electric taxi torsion beam, according to claim 1, wherein the cross beam (1) is formed by two stamping processes, namely pre-forming and shaping, and after stamping, a zoned high-frequency quenching process is adopted.
4. A 1500Mpa class fatigue-resistant electric taxi torsion beam, according to claim 3, wherein the cross beam (1) uses a low heat input high frequency quenching process at the area where both ends overlap the trailing arms (1).
5. The 1500Mpa class fatigue-resistant electric taxi torsion beam, according to claim 1, wherein a round rib is penetrated through the middle of the reinforcement plate (3), and the cross-sectional shape of the rib is wide at both ends and narrow in the middle.
6. A 1500Mpa class fatigue-resistant electric taxi torsion beam, according to claim 1, wherein two bend radii are provided on the central axis of the trailing arm (2).
7. A 1500Mpa class fatigue-resistant electric taxi torsion beam, according to claim 1, wherein the trailing arm (2) is provided with a projection, which overlaps and is welded to the sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011325439.3A CN112440638A (en) | 2020-11-24 | 2020-11-24 | 1500 Mpa-grade anti-fatigue electric taxi torsion beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011325439.3A CN112440638A (en) | 2020-11-24 | 2020-11-24 | 1500 Mpa-grade anti-fatigue electric taxi torsion beam |
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|---|---|
| CN112440638A true CN112440638A (en) | 2021-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011325439.3A Pending CN112440638A (en) | 2020-11-24 | 2020-11-24 | 1500 Mpa-grade anti-fatigue electric taxi torsion beam |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104651574A (en) * | 2014-05-23 | 2015-05-27 | 上海汇众汽车制造有限公司 | High-strength part forming process |
| CN204820995U (en) * | 2015-06-30 | 2015-12-02 | 北汽福田汽车股份有限公司 | Torsion beam and vehicle |
| DE102014211632A1 (en) * | 2014-06-17 | 2015-12-17 | Bayerische Motoren Werke Aktiengesellschaft | Wheel carrier of a vehicle with a clamp-seat connection |
| CN105966187A (en) * | 2016-07-08 | 2016-09-28 | 奇瑞汽车股份有限公司 | Rear torsion beam assembly of vehicle |
| CN206598679U (en) * | 2017-01-23 | 2017-10-31 | 中国第一汽车股份有限公司 | A kind of automobile torsion beam formula rear axle |
| CN206870784U (en) * | 2017-03-03 | 2018-01-12 | 袁璐 | Rear suspension torsion girder construction |
-
2020
- 2020-11-24 CN CN202011325439.3A patent/CN112440638A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104651574A (en) * | 2014-05-23 | 2015-05-27 | 上海汇众汽车制造有限公司 | High-strength part forming process |
| DE102014211632A1 (en) * | 2014-06-17 | 2015-12-17 | Bayerische Motoren Werke Aktiengesellschaft | Wheel carrier of a vehicle with a clamp-seat connection |
| CN204820995U (en) * | 2015-06-30 | 2015-12-02 | 北汽福田汽车股份有限公司 | Torsion beam and vehicle |
| CN105966187A (en) * | 2016-07-08 | 2016-09-28 | 奇瑞汽车股份有限公司 | Rear torsion beam assembly of vehicle |
| CN206598679U (en) * | 2017-01-23 | 2017-10-31 | 中国第一汽车股份有限公司 | A kind of automobile torsion beam formula rear axle |
| CN206870784U (en) * | 2017-03-03 | 2018-01-12 | 袁璐 | Rear suspension torsion girder construction |
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Application publication date: 20210305 |