Extrusion-cast integral aluminum alloy rear subframe

Abstract

An extrusion-cast, integral aluminum alloy rear subframe includes a frame body formed integrally by extrusion casting, wherein the front crossbeam, rear crossbeam, left longitudinal beam, and right longitudinal beam of the frame body form a rectangular frame. Symmetrical first extension arms are provided at the left and right ends of the front crossbeam, each with a first mounting hole and a toe-toe mounting bracket. Symmetrical second extension arms are provided at the left and right ends of the rear crossbeam, each with a second mounting hole. The first and second extension arms are connected by an arched support longitudinal beam, a front upper control arm mounting bracket is formed on the arched support longitudinal beam, a steering gear mounting groove is provided on the arched support longitudinal beam, and a rear upper control arm mounting bracket is formed at the connection between the arched support longitudinal beam and the rear crossbeam. A reinforcement crossbeam is formed between the left and right longitudinal beams, with rear lower control arm mounting brackets formed at each end of the reinforcement crossbeam. A front suspension mounting hole is provided in the middle of the front crossbeam, and two rear suspension mounting holes are symmetrically provided on the rear crossbeam. The cross-section of the entire rear subframe is a downward-opening U-shaped groove.

Description

Technical Field

[0001] The present invention relates to the field of automobile parts, in particular to an extrusion-cast integral aluminum alloy rear subframe. Background Art

[0002] When a car travels on various road surfaces, its suspension system is subject to various impacts, which can cause deformation over time. The subframe connects the various discrete suspension components, replacing the body to withstand deformation such as load-bearing bending, non-horizontal torsion, lateral bending, and horizontal diamond torsion, thereby improving the body's torsional resistance. With the development of the automotive industry, the market has placed higher demands on the structure and rigidity of subframes. As part of this subframe, the rear subframe also faces challenges.

[0003] Currently, rear subframes are typically manufactured through low-pressure or high-pressure casting, where the subframe is segmented into hollow cores. After forming, the segments are then connected by welding or riveting to form the complete rear subframe. However, this decentralized casting method requires different casting molds and sand core molds for each segment, resulting in a large number of tools, increased equipment and tooling investment, and high production costs. Furthermore, due to decentralized casting, the joints between the segments are more susceptible to fracture during long-term use, shortening the service life of the entire rear subframe. To address these issues, a low-cost, high-strength, squeeze-cast, one-piece aluminum alloy rear subframe is needed. Summary of the Invention

[0004] The purpose of the present invention is to address the deficiencies of the prior art and to provide an extrusion-cast integral aluminum alloy rear subframe, which can reduce production costs and improve strength and rigidity.

[0005] The technical solution of the present invention is: an extrusion-cast integral aluminum alloy rear subframe, comprising an extrusion-cast integrally formed frame body, wherein the front crossbeam, rear crossbeam, left longitudinal beam and right longitudinal beam of the frame body form a rectangular frame, the left and right ends of the front crossbeam respectively extend outward from the longitudinal beam and extend obliquely forward to form symmetrical first extension arms, the extended end of each first extension arm is provided with a first mounting hole, a toe mounting bracket is formed on the first extension arm between the longitudinal beam and the first mounting hole, the left and right ends of the rear crossbeam respectively extend outward from the longitudinal beam in the transverse direction to form symmetrical second extension arms, the extended end of each second extension arm is provided with a second mounting hole, The extension arm and the second extension arm are connected by an integrally formed arched support longitudinal beam, and a front upper control arm mounting bracket is formed on each arched support longitudinal beam, a steering gear mounting groove is provided at the front end of the arched support longitudinal beam, and a rear upper control arm mounting bracket is formed at the connection between the rear end of the arched support longitudinal beam and the rear cross beam, a reinforcement cross beam is formed between the rear sections of the left and right longitudinal beams, and rear lower control arm mounting brackets are formed at both ends of the reinforcement cross beam, a front suspension mounting hole is provided in the middle of the front cross beam, and two rear suspension mounting holes are symmetrically provided on the upper end of the rear cross beam, and the cross sections of the front cross beam, rear cross beam, left longitudinal beam, right longitudinal beam, arched support longitudinal beam, and reinforcement cross beam are all U-shaped grooves opening downward.

[0006] The included angle between the two first extension arms is 135° to 140°.

[0007] A plurality of reinforcing ribs are arranged in the U-shaped groove.

[0008] The first mounting hole and the second mounting hole both extend in a vertical direction, and a first bushing is provided in each of the holes.

[0009] The front suspension mounting hole extends in the front-to-back direction, and the rear suspension mounting hole is in the horizontal direction. Second bushings are provided in both the front suspension mounting hole and the rear suspension mounting hole.

[0010] The toe-mounting bracket extends horizontally and obliquely, the front upper control arm mounting bracket extends horizontally and obliquely, the rear upper control arm mounting bracket extends upward, and the rear lower control arm mounting bracket extends downward. The toe-mounting bracket, the front upper control arm mounting bracket, the rear upper control arm mounting bracket, and the rear lower control arm mounting bracket are all double-arm mounting brackets with a U-shaped structure.

[0011] The steering gear installation groove extends forward, and an internal thread is provided in the steering gear installation groove.

[0012] The above technical solution is adopted: the entire rear subframe includes a front crossbeam, a rear crossbeam, a left longitudinal beam, a right longitudinal beam, an arched supporting longitudinal beam, a reinforcement crossbeam and multiple mounting points and is an integrated molded structure, which not only makes the entire rear subframe more solid and has a long service life, but also facilitates the arrangement of mounting points and machining; the rear subframe is an open structure, and reinforcing ribs are provided in the open grooves, which can effectively reduce weight. At the same time, extrusion casting is adopted, which has better performance and can further reduce weight than low-pressure casting or high-pressure casting. Extrusion casting uses a metal mold with a simple structure and high production efficiency, effectively reducing production costs.

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 A top view of the present invention;

[0016] Figure 3 for Figure 2 BB section;

[0017] Figure 4 for Figure 2 CC section;

[0018] Figure 5 for Figure 2 DD section view;

[0019] Figure 6 for Figure 2 EE section;

[0020] Figure 7 for Figure 2 HH section view;

[0021] Figure 8 It is a front view of the present invention;

[0022] Figure 9 for Figure 8 GG section;

[0023] Figure 10 A bottom view of the present invention;

[0024] Figure 11 for Figure 10 FF section view. DETAILED DESCRIPTION

[0025] See also Figures 1 to 11An extrusion-cast, integral aluminum alloy rear subframe includes a frame body formed integrally by extrusion casting. The frame body comprises a front crossbeam 12, a rear crossbeam 13, a left longitudinal beam 11, and a right longitudinal beam 14, forming a rectangular frame. The left and right ends of the front crossbeam 12 extend outward from the longitudinal beam and extend obliquely forward to form symmetrical first extension arms 5. The angle between the two first extension arms 5 is 135° to 140°, and in this embodiment, the angle between the two first extension arms 5 is 138°. Each first extension arm 5 has a first mounting hole 51 defined at its extended end. A toe-in mounting bracket 52 is formed on the first extension arm 5 between the longitudinal beam and the first mounting hole 51, extending horizontally and obliquely. The left and right ends of the rear crossbeam 13 extend outward from the longitudinal beam in a transverse direction to form symmetrical second extension arms 6. Each second extension arm 6 has a second mounting hole 61 defined at its extended end. Both the first and second mounting holes 51 extend vertically, and each hole contains a first bushing 53. The first extension arm 5 and the second extension arm 6 are connected by an integrally formed arched support longitudinal beam 2. Each arched support longitudinal beam 2 is formed with a front upper control arm mounting bracket 21, which extends horizontally and obliquely. A steering gear mounting slot 7 is provided at the front end of the arched support longitudinal beam 2. The steering gear mounting slot 7 extends forward and is provided with an internal thread. A rear upper control arm mounting bracket 22 is formed at the connection between the rear end of the arched support longitudinal beam 2 and the rear crossbeam 13, and the rear upper control arm mounting bracket 22 extends upward. A reinforcing crossbeam 3 is formed between the rear sections of the left and right longitudinal beams 11 and 14. Rear lower control arm mounting brackets 8 are formed at both ends of the reinforcing crossbeam 3, and the rear lower control arm mounting brackets 8 extend downward. The toe-in mounting bracket 52, the front upper control arm mounting bracket 21, the rear upper control arm mounting bracket 22, and the rear lower control arm mounting bracket 8 are all U-shaped double-arm mounting brackets. A front suspension mounting hole 4 is located in the center of the front crossbeam 12, extending in the front-to-back direction. Two rear suspension mounting holes 23 are symmetrically located at the upper end of the rear crossbeam 13, extending horizontally. Second bushings 41 are located within both the front and rear suspension mounting holes 4, 23. The first and second bushings 53, 41 are rubber bushings that effectively mitigate vibration and reduce noise. The front crossbeam 12, rear crossbeam 13, left and right longitudinal beams 11, 14, arched support beams 2, and reinforcement beams 3 all have downward-opening U-shaped grooves. Several reinforcing ribs are located within these U-shaped grooves, effectively increasing the overall frame strength and service life.

[0026] See also Figure 3 The first mounting holes 51 are each provided with a first bushing 53, which is a rubber bushing that effectively cushions vibration and noise caused by different road conditions. The second mounting holes 61 have the same structure and bushing as the first mounting holes 51.

[0027] See also Figure 4A second bushing 41 is provided in the front suspension mounting hole 4. The second bushing 41 is a rubber bushing that plays a role in shock absorption and noise isolation.

[0028] See also Figure 5 The toe-in mounting bracket 52 is a double-arm mounting bracket with a U-shaped structure, wherein a threaded hole is provided on one arm, and a toe-in adjusting rod 55 is fixed by a first bolt 54 .

[0029] See also Figure 6 The front upper control arm mounting bracket 21 is a double-arm mounting bracket with a U-shaped structure. Both arms are provided with holes, and the front control arm 25 is fixed by a second bolt 24 and a mounting nut 26.

[0030] See also Figure 9 The steering gear mounting groove 7 is provided with an internal thread, and the rear suspension steering gear 72 is fixed by a third bolt 71.

[0031] See also Figure 11 The rear lower control arm mounting bracket 8 is a double-arm mounting bracket with a U-shaped structure. Both arms are provided with holes, and the rear lower control arm 83 is fixed by a fourth bolt 81 and an eccentric nut 82.

[0032] The rear subframe of this embodiment is first extrusion-cast as an integral frame using a metal mold, and then machined to remove excess material to ensure the dimensional accuracy of each mounting point; the mounting holes, mounting brackets, and the integral frame are integrally cast, making the arrangement and machining of each mounting point convenient; the casting uses opening features, and the strength of the locally weakened structure is improved by adding reinforcing ribs to meet performance requirements; rubber bushings are arranged in the body mounting holes, which can effectively reduce the vibration and noise caused by different road conditions and enhance the vehicle driving experience; the entire rear subframe is extrusion-casted, and the material properties are far superior to conventional low-pressure casting and high-pressure casting, which can effectively reduce the wall thickness, thereby reducing weight and reducing production costs, and the extrusion casting production cycle is short, effectively improving production efficiency and further saving costs.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the scope of protection of the present invention.

Claims

1. An extrusion-cast integral aluminum alloy rear subframe, comprising an extrusion-cast integrally formed frame body, wherein the front crossbeam (12), rear crossbeam (13), left longitudinal beam (11), and right longitudinal beam (14) of the frame body form a rectangular frame, characterized in that: The left and right ends of the front cross beam (12) extend outward from the longitudinal beam and extend obliquely forward to form symmetrical first extension arms (5). The extended end of each first extension arm (5) is provided with a first mounting hole (51). A toe mounting bracket (52) is formed on the first extension arm (5) between the longitudinal beam and the first mounting hole (51). The left and right ends of the rear cross beam (13) extend outward from the longitudinal beam in the transverse direction to form symmetrical second extension arms (6). The extended end of each second extension arm (6) is provided with a second mounting hole (61). The first extension arm (5) and the second extension arm (6) are connected by an integrally formed arched support longitudinal beam (2). A front upper control arm mounting bracket (21) is formed on each arched support longitudinal beam (2). A steering gear mounting groove (7) is provided at the front end of the arched supporting longitudinal beam (2), a rear upper control arm mounting bracket (22) is formed at the connection between the rear end of the arched supporting longitudinal beam (2) and the rear cross beam (13), a reinforcing cross beam (3) is formed between the rear sections of the left longitudinal beam (11) and the right longitudinal beam (14), and rear lower control arm mounting brackets (8) are formed at both ends of the reinforcing cross beam (3), a front suspension mounting hole (4) is provided in the middle of the front cross beam (12), and two rear suspension mounting holes (23) are symmetrically provided at the upper end of the rear cross beam (13), and the cross sections of the front cross beam (12), the rear cross beam (13), the left longitudinal beam (11), the right longitudinal beam (14), the arched supporting longitudinal beam (2), and the reinforcing cross beam (3) are all U-shaped grooves with an opening downward.

2. The squeeze-cast integral aluminum alloy rear subframe according to claim 1, characterized in that: The included angle between the two first extension arms (5) is 135° to 140°.

3. The squeeze-cast integral aluminum alloy rear subframe according to claim 1, characterized in that: A plurality of reinforcing ribs are arranged in the U-shaped groove.

4. The squeeze-cast integral aluminum alloy rear subframe according to claim 1, characterized in that: The first mounting hole (51) and the second mounting hole (61) both extend in a vertical direction, and a first bushing (53) is provided in each of the holes.

5. The squeeze-cast integral aluminum alloy rear subframe according to claim 1, characterized in that: The front suspension mounting hole (4) extends in the front-to-back direction, and the rear suspension mounting hole (23) is in the horizontal direction. Second bushings (41) are provided in both the front suspension mounting hole (4) and the rear suspension mounting hole (23).

6. The squeeze-cast integral aluminum alloy rear subframe according to claim 1, characterized in that: The toe-mounting bracket (52) extends horizontally and obliquely, the front upper control arm mounting bracket (21) extends horizontally and obliquely, the rear upper control arm mounting bracket (22) extends upward, and the rear lower control arm mounting bracket (8) extends downward. The toe-mounting bracket (52), the front upper control arm mounting bracket (21), the rear upper control arm mounting bracket (22), and the rear lower control arm mounting bracket (8) are all double-arm mounting brackets with a U-shaped structure.

7. The squeeze-cast integral aluminum alloy rear subframe according to claim 1, characterized in that: The steering gear installation groove (7) extends forward, and an internal thread is provided in the steering gear installation groove (7).

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