Novel stamping-welding rear subframe

Abstract

The application provides a novel stamping and welding rear subframe, which comprises a subframe main body formed by a front cross beam (1), a rear cross beam (2), a left longitudinal beam (3) and a right longitudinal beam (4), the subframe is provided with a control arm support and a spring arm support, the spring arm support comprises a left spring arm support (5) and a right spring arm support (6), the left spring arm support (5) and the right spring arm support are arranged on the inner side of the space formed by the subframe; the subframe further comprises a V-shaped cross beam (7), the two ends of the V-shaped cross beam (7) are connected with the left spring arm support (5) and the right spring arm support (6) respectively, the middle part of the V-shaped cross beam (7) is connected with the rear cross beam (2), and the V-shaped cross beam (7) forms a V-shaped opening which faces the front cross beam (1). The size precision of the overall profile of the subframe is improved, the arrangement is compact, and the requirement for the arrangement space is reduced. The durability and the rigidity are improved.

Description

Technical Field

[0001] This invention relates to the field of subframes, and more particularly to a novel stamped and welded rear subframe. Background Technology

[0002] With the rapid development of new energy vehicles in China, most new energy vehicle manufacturers are choosing five-link suspensions for better handling to enhance the competitiveness of their products. The subframe, as a crucial structural component of the suspension system, bears the motor, control arms, stabilizer bar, steering gear, etc., resulting in limited space for its installation and a relatively complex structure. New energy vehicles are generally heavier, thus experiencing greater lateral forces. To achieve better handling, higher stiffness at the control arm points is required.

[0003] As the main component bearing lateral forces, the spring arms on the five-link subframe require higher Y-direction stiffness. Generally, to improve the Y-direction stiffness of the sway arm, a crossbeam is connected to the left and right spring arm supports, making the left and right spring arm supports a whole, thereby improving the stiffness of the spring arm.

[0004] This structure has the following drawbacks:

[0005] 1. The crossbar must span the subframe, which requires more space and reduces the space available for components such as motors, exhaust pipes, and underbody protection plates around the subframe.

[0006] 2. The crossbars are bolted together, resulting in high stress at the connection points. This necessitates a thicker design for the crossbeams and supports, and adds assembly steps, reducing connection reliability and increasing cost and weight.

[0007] 3. The crossbar has limited effect on improving the Y-axis stiffness of the control arm. Summary of the Invention

[0008] This invention provides a novel stamped and welded rear subframe to address existing technical problems.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A novel stamped and welded rear subframe includes a subframe body formed by a front crossbeam, a rear crossbeam, a left longitudinal beam, and a right longitudinal beam. The subframe is equipped with a control arm bracket and a spring arm bracket. The spring arm bracket includes a left spring arm bracket and a right spring arm bracket, which are located inside the space enclosed by the subframe. It also includes a V-shaped crossbeam, with its two ends connected to the left spring arm bracket and the right spring arm bracket, respectively. The middle part of the V-shaped crossbeam is connected to the rear crossbeam, and the V-shaped opening formed by the V-shaped crossbeam faces the front crossbeam.

[0011] Preferably, the bottom of the left spring arm bracket is wrapped around the rear crossbeam and the left longitudinal beam, and the bottom of the right spring arm bracket is wrapped around the rear crossbeam and the right longitudinal beam, so that the rear crossbeam, the left spring arm bracket, the right spring arm bracket, and the V-shaped crossbeam form a whole.

[0012] Preferably, the V-shaped crossbeam forms a left triangular area and a right triangular area with the left spring arm, the right spring arm, and the rear crossbeam on the left and right sides respectively; the V-shaped structure of the V-shaped crossbeam creates a clearance space.

[0013] Preferably, the V-shaped crossbeam is a hollow tubular beam structure. The V-shaped crossbeam is divided into a left beam section and a right beam section by the connection point with the rear crossbeam. The left beam section and the right beam section have the same structure. The middle part of the left beam section has a flat keyway cross section, in which the direction of the longer length is parallel to the perpendicular line of the V-shaped opening edge, and the flatness of the keyway cross section is in the Z direction.

[0014] Preferably, the bend area formed in the middle of the V-shape is provided with a recessed feature, which is located on the surface of the V-shaped crossbeam inside the bend area.

[0015] Preferably, the cross-sectional shape at both ends of the V-shaped beam is elliptical, and the Z-axis dimension of the cross-sectional shape at both ends of the V-shaped beam is greater than the Z-axis dimension of the cross-sectional shape at the middle of the V-shaped beam.

[0016] Preferably, stress holes are provided at the ends and the outer side of the middle of the V-shaped beam, and grooves are provided on the inner sides of both ends of the V-shaped beam, with the bottom surface of the grooves being flat.

[0017] Preferably, the overlap between the rear crossbeam and the V-shaped crossbeam forms a planar area on the inward side, and a boss is provided on the planar area.

[0018] Preferably, the planar area is located inside the V-shaped bend of the V-shaped beam, and there are two bosses.

[0019] Preferably, a reinforcing plate is provided inside the joint between the rear crossbeam and the V-shaped crossbeam, a rib is provided on the outer side of the spring arm bracket, a cross arm bracket is provided on the subframe, arc-shaped holes are cut out on both sides of the cross arm bracket, a secondary flange is added to the flange of the cross arm bracket, two claw-shaped structures extend from the tail of the front toe arm bracket, and the claw-shaped structures are fastened to the front crossbeam; it also includes a control arm rear bracket, the side of the control arm rear bracket is extended and connected to the left and right stabilizer bar brackets; the left longitudinal beam and the right longitudinal beam are hydraulic tube beams, the V-shaped tube beam is a hydraulic tube beam, and the front crossbeam and the rear crossbeam are stamped and welded beams.

[0020] This solution has the following beneficial effects:

[0021] This design improves the dimensional accuracy of the subframe's overall profile. The V-beam design increases the stiffness of the spring arm support by 12 kN within a smaller space, resulting in a compact layout and reduced space requirements. Through the design of local overlapping surfaces and structures, the matching and overlapping accuracy between parts is improved, leading to a 40% increase in the overall durability and a 25% increase in stiffness of the subframe. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the subframe.

[0023] Figure 2 This is a schematic diagram of the overall structure of the subframe.

[0024] Figure 3 This is a schematic diagram of the overall structure of the subframe.

[0025] Figure 4 This is a schematic diagram of the overall structure of the rear crossbeam.

[0026] Figure 5 This is a schematic diagram of the V-shaped beam structure.

[0027] Figure 6 This is a schematic diagram of the cross-section of the middle area of ​​the V-shaped beam.

[0028] Figure 7 This is a schematic diagram of the cross-sections at both ends of the V-shaped beam.

[0029] Figure 8 This is a schematic diagram showing the location of the reinforcing plate.

[0030] The reference numerals in the figure correspond to the following technical names:

[0031] 1—Front crossbeam, 2—Rear crossbeam, 3—Left longitudinal beam, 4—Right longitudinal beam, 5—Left spring arm support, 6—Right spring arm support, 7—V-shaped crossbeam, 8—Left triangular area, 9—Right triangular area, 10—Avoidance space, 11—Left beam section, 12—Right beam section, 13—Keyway-shaped section, 14—Corner area, 15—Concave feature, 16—Stress hole, 17—Groove, 18—Planar area, 19—Boss, 20—Reinforcing plate, 21—Protruding rib, 22—Cross arm support, 23—Arc-shaped hole, 24—Claw-shaped structure. Detailed Implementation

[0032] Example 1

[0033] A novel stamped and welded rear subframe includes a subframe body formed by a front crossbeam 1, a rear crossbeam 2, a left longitudinal beam 3, and a right longitudinal beam 4. The subframe is equipped with a control arm bracket and a spring arm bracket. The spring arm bracket includes a left spring arm bracket 5 and a right spring arm bracket 6, which are located inside the space enclosed by the subframe. The subframe also includes a V-shaped crossbeam 7, with its two ends connected to the left spring arm bracket 5 and the right spring arm bracket 6, respectively. The middle part of the V-shaped crossbeam 7 is connected to the rear crossbeam 2, and the V-shaped opening formed by the V-shaped crossbeam 7 faces the front crossbeam 1.

[0034] The bottom of the left spring arm bracket 5 is wrapped around the rear crossbeam 2 and the left longitudinal beam 3, and the bottom of the right spring arm bracket 6 is wrapped around the rear crossbeam 2 and the right longitudinal beam 4, making the rear crossbeam 2, left spring arm bracket 5, right spring arm bracket 6, and V-shaped crossbeam 7 a whole. The V-shaped crossbeam 7 forms a left triangular area 8 and a right triangular area 8 on the left and right sides with the left spring arm, right spring arm, and rear crossbeam 2 respectively; thus effectively resisting Y-direction deformation and increasing the stiffness of the spring arm bracket. The V-shaped structure of the V-shaped crossbeam 7 forms an clearance space 10, providing more space for the motor. The V-shaped beam is designed as a hydraulic pipe structure, which improves the structural accuracy of the V-shaped beam and makes the connection between the V-shaped beam and the spring arm and rear crossbeam 2 more reliable.

[0035] The V-shaped crossbeam 7 is a hollow tubular beam structure. Divided into a left beam section 11 and a right beam section 12 by its connection point with the rear crossbeam 2, the left and right beam sections 11 and 12 have identical structures. The middle section of the left beam section 11 has a flat, keyway-shaped cross-section 13, with the longer direction parallel to the perpendicular line of the V-shaped opening. The flatness of the keyway-shaped cross-section 13 is in the Z-direction. This increases the height of the cross-section at the corner of the V-shaped beam, improving the rigidity of the V-shaped beam itself, thereby increasing the Y-direction rigidity of the spring arm. The flat cross-section reduces the Z-direction height of the V-shaped beam, reducing the space requirements for the Z-direction arrangement of the V-shaped beam, satisfying the clearance requirements with the exhaust pipe and the motor, and making the V-shaped beam less prone to deformation during processing and transportation.

[0036] The V-shaped bend area 14 is provided with a recessed feature 15, which is located on the surface of the V-shaped beam 7 inside the bend area 14. This reduces the thinning rate on the outer side of the bend during the V-shaped beam forming process, reduces the mold gap on the outer side of the bend, and makes the cross-sectional dimensions at this point more accurate after forming.

[0037] The end sections 71 of the V-shaped beam 7 are elliptical in shape, and the Z-axis dimension of the end sections of the V-shaped beam 7 is larger than that of the middle section. This structure increases the Z-axis cross-section and is designed as an expanded structure, which increases the perimeter of the end sections, thereby increasing the welding matching length with the inner plate of the spring arm, reducing the stress in the contact area, and improving durability.

[0038] Stress holes 16 are provided at the ends and on the outer sides of the middle section of the V-shaped crossbeam 7. Grooves 17 are provided on the inner sides of both ends of the V-shaped crossbeam 7, and the bottom surface of the grooves 17 is flat. The grooves 17 on the end profile can improve the local deformation capacity of the V-shaped beam, thereby reducing the impact from the spring arm force, reducing the stress at the joint between the V-shaped beam and the rear crossbeam 2 and the spring arm support, and improving durability. The joint between the rear crossbeam 2 and the V-shaped crossbeam 7 forms a planar region 18 on the inner side, and a boss 19 is provided on the planar region 18. This ensures the surface profile of the rear crossbeam 2 after forming, making the welding matching more reliable. The two bosses 19 disperse the stress of the contact between the V-shaped beam and the rear crossbeam 2, and provide Y-direction support for the V-shaped beam, thereby improving the fatigue life at the joint between the V-shaped beam and the rear crossbeam 2, and further increasing the Y-direction stiffness of the spring arm. The planar region 18 is located on the inner side of the V-shaped bend of the V-shaped crossbeam 7, and there are two bosses 19.

[0039] A reinforcing plate 20 is installed inside the joint between the rear crossbeam 2 and the V-shaped crossbeam 7, which increases the stiffness of the V-shaped rod support, effectively reduces surface deformation, and improves the stiffness and strength of the joint.

[0040] The outer side of the spring arm bracket is provided with a raised rib 21, which can effectively prevent the springback of the profile during stamping and ensure dimensional accuracy. A crossarm bracket 22 is provided on the subframe. Arc-shaped holes 23 are carved out on both sides of the crossarm bracket 22. A secondary flange is added to the flange of the crossarm bracket 22, which can increase the local deformation of the upper crossarm bracket 22, reduce the impact from the upper crossarm, and thus reduce the stress at the joint between the upper crossarm and the longitudinal beam without affecting the rigidity, thereby improving durability. Two claw-shaped structures 24 extend from the tail of the front toe arm bracket and are fastened to the front crossbeam 1. It also includes a control arm rear bracket, the side of which is extended and connected to the left and right stabilizer bar brackets. The left longitudinal beam 3 and the right longitudinal beam 4 are hydraulic tube beams, the V-shaped tube beam is a hydraulic tube beam, and the front crossbeam 1 and the rear crossbeam 2 are stamped and welded beams. This technical solution improves the dimensional accuracy of the overall subframe profile. The V-beam design increases the stiffness of the spring arm support by 12 kN / mm within a smaller space, resulting in a compact layout and reduced space requirements. Through the design of local overlapping surfaces and structures, the matching and overlapping accuracy between parts is improved, leading to a 40% increase in the overall durability of the subframe and a 25% increase in stiffness.

Claims

1. A novel stamped and welded rear subframe, characterized in that: The vehicle includes a subframe body formed by a front crossbeam (1), a rear crossbeam (2), a left longitudinal beam (3), and a right longitudinal beam (4). A control arm bracket and a spring arm bracket are mounted on the subframe. The spring arm bracket includes a left spring arm bracket (5) and a right spring arm bracket (6), which are located inside the space enclosed by the subframe. It also includes a V-shaped crossbeam (7), whose two ends are connected to the left spring arm bracket (5) and the right spring arm bracket (6), respectively. The middle part of the beam (7) is connected to the rear crossbeam (2), and the V-shaped crossbeam (7) forms a V-shaped opening facing the front crossbeam (1); the left longitudinal beam (3) and the right longitudinal beam (4) are hydraulic pipe beams, the V-shaped pipe beam is a hydraulic pipe beam, the V-shaped crossbeam (7) is a hollow pipe beam structure, the V-shaped crossbeam (7) is divided into a left beam part (11) and a right beam part (12) with the connection point with the rear crossbeam (2) as the boundary, the left beam part (11) and the right beam part (12) have the same structure, and the middle part of the left beam part (11) is a flat keyway cross section (13).

2. The novel stamped and welded rear subframe according to claim 1, characterized in that: The bottom of the left spring arm bracket (5) is wrapped around the rear crossbeam (2) and the left longitudinal beam (3), and the bottom of the right spring arm bracket (6) is wrapped around the rear crossbeam (2) and the right longitudinal beam (4), so that the rear crossbeam (2), the left spring arm bracket (5), the right spring arm bracket (6), and the V-shaped crossbeam (7) form a whole.

3. A novel stamped and welded rear subframe according to claim 2, characterized in that: The V-shaped beam (7) forms a left triangular area (8) and a right triangular area (8) on the left and right sides respectively with the left spring arm, the right spring arm and the rear beam (2); the V-shaped structure of the V-shaped beam (7) forms an avoidance space (10).

4. The novel stamped and welded rear subframe according to claim 1, characterized in that: The direction with the longer length is parallel to the perpendicular line of the V-shaped opening edge, and the flat shape of the keyway section (13) is in the Z direction.

5. A novel stamped and welded rear subframe according to claim 3, characterized in that: The bend area (14) formed in the middle of the V-shape is provided with a recessed feature (15), which is located on the surface of the V-shaped crossbeam (7) inside the bend area (14).

6. A novel stamped and welded rear subframe according to claim 4, characterized in that: The cross-sectional shape at both ends of the V-shaped beam (7) is elliptical. The Z-axis dimension of the cross-sectional shape at both ends of the V-shaped beam (7) is greater than the Z-axis dimension of the cross-sectional shape at the middle of the V-shaped beam (7).

7. A novel stamped and welded rear subframe according to claim 1, characterized in that: Stress holes (16) are provided at the ends and the outer side of the middle of the V-shaped beam (7). Grooves (17) are provided on the inner sides of both ends of the V-shaped beam (7). The bottom surface of the groove (17) is a plane.

8. A novel stamped and welded rear subframe according to claim 1, characterized in that: The overlap between the rear crossbeam (2) and the V-shaped crossbeam (7) forms a planar area (18) on the inside, and a boss (19) is provided on the planar area (18).

9. A novel stamped and welded rear subframe according to claim 8, characterized in that: The planar region (18) is located inside the V-shaped bend of the V-shaped beam (7), and there are two bosses (19).

10. A novel stamped and welded rear subframe according to claim 1, characterized in that: A reinforcing plate (20) is provided inside the joint between the rear crossbeam (2) and the V-shaped crossbeam (7). A rib (21) is provided on the outside of the spring arm bracket. A cross arm bracket (22) is provided on the subframe. Arc-shaped holes (23) are dug out on both sides of the cross arm bracket (22). A secondary flange is added to the flange of the cross arm bracket (22). Two claw-shaped structures (24) extend from the tail of the front toe arm bracket. The claw-shaped structures (24) are fastened to the front crossbeam (1). It also includes a control arm rear bracket. The side of the control arm rear bracket is extended and connected to the left and right stabilizer bar brackets. The front crossbeam (1) and the rear crossbeam (2) are stamped and welded beams.

Images