Rear wheel steering and cross beam integrated rear subframe

Abstract

The application provides a rear wheel steering and cross beam integrated rear subframe, which comprises a frame body, the frame body comprises a "mouth" type structure composed of a front cross beam, an integrated structure beam, a left longitudinal beam and a right longitudinal beam, the integrated structure beam comprises a rear cross beam and a rear wheel steering structure below the rear cross beam; the rear wheel steering structure comprises a U-shaped body, the closed end of the U-shaped body comprises a trapezoidal block, the small end of the trapezoidal block is located on the side away from the front cross beam; three left steering engine mounting points and three right steering engine mounting points are arranged on the integrated structure beam respectively. The application adopts the method that three left steering engine mounting points are arranged on the integrated structure beam to mount left steering engines and three right steering engine mounting points are arranged on the integrated structure beam to mount right steering engines, and the left steering engines and the right steering engines can change the angle of the rear wheels; when the four wheels are all rotated by 90°, the automobile can move horizontally, the automobile can move horizontally, and the four wheels can also realize the automobile U-turn in place.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy subframe technology, specifically to a rear subframe with integrated rear wheel steering and crossbeam. Background Technology

[0002] Traditional cars can only move forward and backward, but they have the following technical drawbacks: making a U-turn on a narrow road requires repeated operations to complete the U-turn.

[0003] Therefore, how to design a rear subframe that integrates rear-wheel steering and crossbeam has become an urgent problem to be solved. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention provides a rear subframe with integrated rear wheel steering and crossbeam to solve at least one of the above-mentioned technical problems.

[0005] The technical solution of this invention is: a rear subframe with integrated rear wheel steering and crossbeam, comprising an integrated low-pressure sand-cast frame body. The frame body includes a "U"-shaped structure composed of a front crossbeam, an integrated structural beam, a left longitudinal beam, and a right longitudinal beam. The top surface of the integrated structural beam is higher than the top surface of the front crossbeam. The integrated structural beam includes a rear crossbeam and a rear wheel steering structure below it. Symmetrically arranged body mounting points are provided at both ends of the front and rear crossbeams. These body mounting points are all located away from the left and right longitudinal beams closest to one end. The first circular tube is the point; the rear wheel steering structure includes a U-shaped main body, the closed end of which includes a trapezoidal block, the small end of which is located away from the front crossbeam; three left steering gear mounting points and three right steering gear mounting points are respectively set on the integrated structural beam, the left steering gear mounting points and the right steering gear mounting points are symmetrically arranged, the two rear wheel steering structures at the bottom of the trapezoidal block are respectively located at the two ends of the inclined side of one side of the trapezoidal block, and the third rear wheel steering structure is located at the bottom of the rear crossbeam; the cross section of the integrated structural beam is equal to twice the cross section of the front crossbeam.

[0006] This invention employs an integrated structural beam composed of a rear crossbeam and its lower rear wheel steering structure. Three mounting points for the left steering gear and three mounting points for the right steering gear are respectively set on this integrated structural beam, with the left and right steering gears arranged symmetrically. Both the left and right steering gear mounting points are formed by casting cylindrical bosses, with a second threaded hole at the center of the top surface of each cylindrical boss. After integral casting, the mounting surfaces and holes are uniformly machined, providing mounting points for the steering gears through the second threaded holes. The left and right steering gears can change the angle of the rear wheels. When all four wheels rotate 90°, the car can move laterally, enabling sideways movement. The four wheels can also work together to achieve a U-turn on the spot, solving the technical shortcomings of traditional cars that can only move forward and backward, and require repeated operations to complete U-turns on narrow roads. The cross-section of the integrated structural beam is approximately twice that of the front crossbeam, featuring strong structure and light weight, greatly improving the dynamic stiffness of the rear subframe, enhancing the vehicle's NVH performance, and improving vehicle comfort. Attached Figure Description

[0007] Figure 1 This is a top view of the installation structure of the present invention.

[0008] Figure 2 for Figure 1 AA cross-section view.

[0009] Figure 3 for Figure 1 BB cross-section.

[0010] Figure 4 This is a bottom view of the installation structure of the present invention.

[0011] Figure 5 This is a front view schematic diagram of the installation structure of the present invention.

[0012] In the diagram: 1. Front crossbeam; 2. Left longitudinal beam; 3. Integrated structural beam; 4. Right longitudinal beam; 5. Stabilizer bar mounting point; 6. Rear upper arm mounting point; 7. Rear guide arm mounting point; 8. Body mounting point; 9. Rear suspension mounting point; 10. Rear suspension draw arm mounting point; 11. Front suspension mounting point; 12. Rear lower arm mounting point; 13. Left steering gear mounting point; 14. Right steering gear mounting point; 301. Rear crossbeam; 302. Rear wheel steering structure; 501. First plane. Detailed Implementation

[0013] The present invention will now be further described with reference to the accompanying drawings.

[0014] See Figures 1-5The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0015] Example 1: A rear subframe with integrated rear wheel steering and crossbeam, referenced. Figure 1 , Figure 3 , Figure 5The vehicle includes a one-piece low-pressure sand-cast frame body made of A356 aluminum alloy. The frame body comprises a "U"-shaped structure consisting of a front crossbeam 1, a one-piece structural beam 3, a left longitudinal beam 2, and a right longitudinal beam 4. This one-piece casting eliminates the need for welding, preventing welding deformation and facilitating overall dimensional control. The top surface of the one-piece structural beam 3 is higher than the top surface of the front crossbeam 1. The one-piece structural beam 3 includes a rear crossbeam 301 and a rear wheel steering structure 302 below it. Both ends of the front crossbeam 1 and the rear crossbeam 301 have symmetrically arranged body mounting points 8, which are located away from the left longitudinal beam 2 and right longitudinal beam 4 closest to them. Each body mounting point 8 is a first circular tube, which is connected to the vehicle body at four points via press-fit bushings. The rear wheel steering structure 302... 2 includes a U-shaped main body, the closed end of which includes a trapezoidal block, the small end of which is located away from the front crossbeam 1; the integrated structural beam 3 is provided with three left steering gear mounting points 13 and three right steering gear mounting points 14 respectively. The left steering gear is installed at the three left steering gear mounting points 13 and the right steering gear is installed at the three right steering gear mounting points 14. The left steering gear mounting points 13 and the right steering gear mounting points 14 are symmetrically arranged. The two rear wheel steering structures 302 at the bottom of the trapezoidal block are located at the two ends of the inclined side of one side of the trapezoidal block, and the third rear wheel steering structure 302 is located at the bottom of the rear crossbeam 301. The left steering gear mounting point 13 adopts a cast cylindrical boss, and a second screw hole is provided at the center of the top surface of the cylindrical boss; the cross section of the integrated structural beam 3 is twice the cross section of the front crossbeam 1. This invention employs an integrated structural beam composed of a rear crossbeam and its lower rear wheel steering structure. Three mounting points for the left steering gear and three mounting points for the right steering gear are respectively set on this integrated structural beam, with the left and right steering gears arranged symmetrically. Both the left and right steering gear mounting points are formed by casting cylindrical bosses, with a second threaded hole at the center of the top surface of each cylindrical boss. After integral casting, the mounting surfaces and holes are uniformly machined, providing mounting points for the steering gears through the second threaded holes. The left and right steering gears can change the angle of the rear wheels. When all four wheels rotate 90°, the car can move laterally, enabling sideways movement. The four wheels can also work together to achieve a U-turn on the spot, solving the technical shortcomings of traditional cars that can only move forward and backward, and require repeated operations to complete U-turns on narrow roads. The cross-section of the integrated structural beam is approximately twice that of the front crossbeam, featuring strong structure and light weight, greatly improving the dynamic stiffness of the rear subframe, enhancing the vehicle's NVH performance, and improving vehicle comfort.

[0016] Example 2: Based on Example 1, with reference to... Figure 1The rear crossbeam 301 has rear upper arm mounting points 6 at both ends extending beyond the corners of the left longitudinal beam 2 and the right longitudinal beam 4. Each rear upper arm mounting point 6 includes a U-shaped first lug, and the two mounting points 6 are arranged in a V-shape. The two rear upper arm mounting points of this invention are located at the corners of the rear crossbeam extending beyond the left and right longitudinal beams, respectively. The U-shaped first lugs at the rear upper arm mounting points provide a clamping surface for the installation of the rear upper arm.

[0017] Example 3: Based on Example 1, rear suspension guide arm mounting points 7 are provided at both ends of the front crossbeam 1, extending beyond the corners of the left longitudinal beam 2 and the right longitudinal beam 4. Each rear suspension guide arm mounting point 7 includes a U-shaped second lug, and the two mounting points 7 are arranged in a figure-eight shape. In this invention, the two rear suspension guide arm mounting points are located at the corners of the front crossbeam extending beyond the left and right longitudinal beams, respectively. The U-shaped second lugs at the rear suspension guide arm mounting points provide a clamping surface for the installation of the rear suspension guide arm.

[0018] Example 4: Based on Example 1, with reference to... Figure 1 , Figure 3 Two stabilizer bar mounting points 5 are provided on the end face of the rear crossbeam 301 on the side away from the front crossbeam 1. The two stabilizer bar mounting points 5 are arranged symmetrically on the left and right. Each stabilizer bar mounting point 5 includes a cast waist-shaped boss. An inclined first plane 501 is provided on the waist-shaped boss. The distance between the upper end of the first plane 501 and the front crossbeam 1 is smaller than the distance between the lower end of the first plane 501 and the front crossbeam 1. First screw holes are provided on the first plane 501 at intervals. The two stabilizer bar mounting points of the present invention are respectively located on the end face of the rear crossbeam on the side away from the front crossbeam. The stabilizer bar mounting points are formed by casting a waist-shaped boss. The first screw hole is machined on the first plane of the waist-shaped boss. After integral casting, the mounting surface and mounting hole are uniformly machined, and the first screw hole provides the mounting point for the stabilizer bar.

[0019] Example 5: Based on Example 1, with reference to... Figure 4 The rear crossbeam 301 is provided with rear suspension mounting points 9 arranged at intervals, and the rear suspension mounting points 9 are second circular tubes; the rear suspension mounting points 9 penetrate the rear crossbeam 301 along the front-rear direction. Both rear suspension mounting points of the present invention are located on the rear crossbeam, and the rear suspension mounting points are second circular tubes. The rear end of the motor mount is connected to the subframe through a press-fit bushing.

[0020] Example 6: Based on Example 1, the two ends of the front crossbeam 1 extending beyond the left longitudinal beam 2 and right longitudinal beam 4 are provided with arc-shaped protrusions. The arc-shaped protrusions are located away from the integrated structural beam 3. The bottom surface of the arc-shaped protrusions is provided with rear suspension traction arm mounting points 10. The rear suspension traction arm mounting points 10 include U-shaped third lugs, with the U-shaped openings of the two third lugs facing the vehicle body mounting point 8 closest to one end. In this invention, the two rear suspension traction arm mounting points are respectively located at the bottom surfaces of the arc-shaped protrusions extending beyond the left and right longitudinal beams at both ends of the front crossbeam. The rear suspension traction arm mounting points adopt a U-shaped arrangement of third lugs, providing a clamping surface for the installation of the rear suspension traction arm.

[0021] Example 7: Based on Example 1, front suspension mounting points 11 are provided on the left longitudinal beam 2 and the right longitudinal beam 4. The two front suspension mounting points 11 are located near the front crossbeam 1. Each front suspension mounting point 11 is a third circular tube, and the two third circular tubes are on the same axis. The third circular tubes pass through the left longitudinal beam 2 and the right longitudinal beam 4 respectively in the left-right direction. In this invention, the two front suspension mounting points are located on the left and right longitudinal beams respectively. The front suspension mounting points use third circular tubes, and the front end of the motor mount is connected to the subframe via a press-fit bushing.

[0022] Example 8: Based on Example 1, each open end of the U-shaped body is provided with a rear lower arm mounting point 12. The rear lower arm mounting point 12 includes a fourth lug arranged in parallel, and the two rear lower arm mounting points 12 are arranged in a figure-eight shape. The two rear lower arm mounting points of this invention are respectively located at the open end of the U-shaped body, and the rear lower arm mounting points adopt the form of a fourth lug arranged in parallel, providing a mounting clamping surface for the installation of the rear lower arm.

[0023] Example 9: Based on Example 1, with reference to... Figure 3 The front crossbeam 1 is a first hollow structure, the rear crossbeam 301 is a second hollow structure, and the rear wheel steering structure 302 is a third hollow structure. The base wall thickness of the first, second, and third hollow structures is 4mm. This invention employs an integrated low-pressure sand core casting for the internal cavity. The internal cavity includes the first hollow front crossbeam, the second hollow rear crossbeam, and the third hollow rear wheel steering structure. The base wall thickness of the internal cavity is 4mm, minimizing weight.

[0024] Example 10: Based on Example 1, with reference to... Figure 2 The left longitudinal beam 2 is the fourth hollow structure, and the right longitudinal beam 4 is the fifth hollow structure. The base wall thickness of both the fourth and fifth hollow structures is 4mm. This invention uses an integrated low-pressure sand core casting for the internal cavity, which includes the left longitudinal beam of the fourth hollow structure and the right longitudinal beam of the fifth hollow structure. The base wall thickness of the internal cavity is 4mm, minimizing weight.

[0025] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A rear subframe with integrated rear wheel steering and crossbeam, comprising a frame body cast in one piece using low-pressure sand casting, characterized in that: The frame body includes a "mouth" - shaped structure composed of a front cross - beam (1), an integral structure beam (3), a left longitudinal beam (2), and a right longitudinal beam (4). The top surface of the integral structure beam (3) is higher than the top surface of the front cross - beam (1). The integral structure beam (3) includes a rear cross - beam (301) and a rear - wheel steering structure (302) below it. Both ends of the front cross - beam (1) and the rear cross - beam (301) are provided with body mounting points (8) arranged symmetrically left and right. The body mounting points (8) are all far from the left longitudinal beam (2) and the right longitudinal beam (4) near one end of them. The body mounting points (8) are the first round tubes. The rear - wheel steering structure (302) includes a U - shaped main body. The closed end of the U - shaped main body includes a trapezoidal block, and the small end of the trapezoidal block is located on the side far from the front cross - beam (1). Three left steering gear mounting points (13) and three right steering gear mounting points (14) are respectively arranged on the integral structure beam (3). The three left steering gear mounting points (13) install the left steering gear, and the three right steering gear mounting points (14) install the right steering gear. The left steering gear mounting points (13) and the right steering gear mounting points (14) are symmetrically arranged respectively. Among them, the two rear - wheel steering structures (302) at the lower part of the trapezoidal block are respectively located at both ends of one inclined side of the trapezoidal block, and the third rear - wheel steering structure (302) is located below the rear cross - beam (301). The left steering gear mounting points (13) are cast cylindrical bosses, and a second screw hole is arranged at the center of the top surface of the cylindrical bosses. The cross - section of the integral structure beam (3) is twice that of the front cross - beam (1).

2. The rear subframe with integrated rear wheel steering and crossbeam as described in claim 1, characterized in that: At the corners where both ends of the rear cross - beam (301) extend beyond the left longitudinal beam (2) and the right longitudinal beam (4), rear upper arm mounting points (6) are provided. The rear upper arm mounting points (6) include first earpieces arranged in a U - shape, and the two rear upper arm mounting points (6) are arranged in a V - shape.

3. The rear subframe with integrated rear wheel steering and crossbeam as described in claim 1, characterized in that: At the corners where both ends of the front cross - beam (1) extend beyond the left longitudinal beam (2) and the right longitudinal beam (4), rear guiding arm mounting points (7) are provided. The rear guiding arm mounting points (7) include second earpieces arranged in a U - shape, and the two rear guiding arm mounting points (7) are arranged in an "eight" - shaped layout.

4. The rear subframe with integrated rear wheel steering and crossbeam as described in claim 1, characterized in that: On the end face of the rear cross - beam (301) on the side far from the front cross - beam (1), two stabilizer bar mounting points (5) are provided. The two stabilizer bar mounting points (5) are arranged symmetrically left and right. The stabilizer bar mounting points (5) include cast waist - shaped bosses, and an inclined first plane (501) is arranged on the waist - shaped bosses. The distance between the upper end of the first plane (501) and the front cross - beam (1) is less than the distance between the lower end of the first plane (501) and the front cross - beam (1). First screw holes are arranged at intervals on the first plane (501).

5. The rear subframe with integrated rear wheel steering and crossbeam as described in claim 1, characterized in that: Rear mounting points (9) arranged at intervals are provided on the rear cross - beam (301). The rear mounting points (9) are the second round tubes; the rear mounting points (9) penetrate the rear cross - beam (301) along the front - to - rear direction.

6. The rear subframe with integrated rear wheel steering and crossbeam as described in claim 1, characterized in that: The front crossbeam (1) has arc-shaped protrusions at both ends that extend beyond the left longitudinal beam (2) and the right longitudinal beam (4). The arc-shaped protrusions are located away from the integrated structural beam (3). The bottom surface of the arc-shaped protrusions is provided with a rear suspension traction arm mounting point (10). The rear suspension traction arm mounting point (10) includes a U-shaped third lug. The U-shaped openings of the two third lugs face the vehicle body mounting point (8) near one end of them.

7. The rear subframe with integrated rear wheel steering and crossbeam as described in claim 1, characterized in that: The left longitudinal beam (2) and the right longitudinal beam (4) are provided with front suspension mounting points (11). The two front suspension mounting points (11) are close to the front cross beam (1). The front suspension mounting points (11) are third round pipes. The two third round pipes are on the same axis. The third round pipes pass through the left longitudinal beam (2) and the right longitudinal beam (4) respectively in the left and right directions.

8. The rear subframe with integrated rear wheel steering and crossbeam as described in claim 1, characterized in that: The U-shaped body has a rear lower arm mounting point (12) at the open end. The rear lower arm mounting point (12) includes a fourth ear piece arranged in parallel. The two rear lower arm mounting points (12) are arranged in a figure-eight shape.

9. A rear subframe with integrated rear wheel steering and crossbeam as described in claim 1, characterized in that: The front crossbeam (1) is a first hollow structure, the rear crossbeam (301) is a second hollow structure, and the rear wheel steering structure (302) is a third hollow structure. The base wall thickness of the first hollow structure, the second hollow structure, and the third hollow structure is 4mm.

10. A rear subframe with integrated rear wheel steering and crossbeam as described in claim 1, characterized in that: The left longitudinal beam (2) is the fourth hollow structure, and the right longitudinal beam (4) is the fifth hollow structure. The foundation wall thickness of the fourth hollow structure and the fifth hollow structure is 4mm.

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