Rear swing arm structure of vehicle body

Abstract

The utility model discloses a rear swing arm structure of a vehicle body, which comprises an upper swing arm and a lower swing arm, one end of the upper swing arm and one end of the lower swing arm are rotatably connected with the vehicle body, the other end of the upper swing arm and the other end of the lower swing arm are rotatably connected with a steering knuckle, and the lower swing arm comprises an isosceles trapezoid-shaped connecting part and two connecting arms arranged on the connecting part. The two connecting arms are in a splayed shape and are rotationally connected with a vehicle body, and the connecting parts are connected with the connecting corners at the bottoms of the cavel bodies. The two connecting arms are symmetrically arranged, a shock absorber is arranged over the symmetric line of the two connecting arms, and the two ends of the shock absorber are rotationally connected to the vehicle body and the connecting part correspondingly. The upper swing arm is of a single-arm structure arranged on the connecting part and one of the connecting arms, and the shock absorber and the upper swing arm are arranged in a staggered mode. The lower swing arm is kept to be of a splayed structure, the bottom of the shock absorber is hinged to the middle of the lower swing arm connecting part, the top of the shock absorber is hinged to the vehicle body, the upper swing arm is arranged to be of a single-arm structure and staggered with the shock absorber so as to provide an enough installation position for the shock absorber, and the specification needed by installation of the shock absorber becomes possible; the shock absorption performance of the vehicle body is ensured.

Description

Technical Field

[0001] The utility model relates to a swing arm of an off-road vehicle, in particular to a rear swing arm structure of a vehicle body. Background Art

[0002] Off-road vehicles have strong passability and can travel in soft and complex areas such as Gobi, beaches, hills, and farmlands. Therefore, they are often used in the agricultural field as farm vehicles.

[0003] Because the terrain of the off-road vehicle driving area is complex, its buffering performance is particularly important. At present, the steering knuckle is usually connected to the vehicle body through an upper swing arm and a lower swing arm, and a shock absorber is arranged between the upper swing arm and the lower swing arm to achieve the purpose of shock absorption. The swing arms commonly used at present are all figure-eight structures, such as a lower swing arm of an automobile disclosed in the patent with application number CN109606043A and a rear upper swing arm assembly and a vehicle disclosed in the patent with application number CN114789633A, which respectively disclose figure-eight swing arms.

[0004] Although the cooperation of the above-mentioned figure-eight upper and lower control arms and shock absorbers provides some shock-absorbing effects for the vehicle body, the figure-eight structure of the upper and lower control arms limits the installation position of the shock absorbers, resulting in only small shock absorbers being installed, or even only being set between the two control arms, ultimately making it impossible for large shock absorbers to provide sufficient shock-absorbing performance. Utility Model Content

[0005] Based on the fact that the figure-eight structure of the upper swing arm and the lower swing arm in the prior art limits the installation position of the shock absorber, only small shock absorbers can be installed, or even can only be set between the two swing arms, which ultimately leads to the inability of large shock absorbers to provide sufficient shock absorbing performance. The utility model provides a rear swing arm structure for a vehicle body.

[0006] The technical solution adopted by the utility model to solve the above technical problems is as follows: the rear swing arm structure of the vehicle body includes an upper swing arm and a lower swing arm, one end of the upper swing arm and the lower swing arm is connected to the vehicle body, the other end of the upper swing arm and the lower swing arm is connected to the steering knuckle, the lower swing arm includes a connecting part in the shape of an isosceles trapezoid and two connecting arms arranged on the connecting part, the two connecting arms are in an eight-shaped shape and are connected to the vehicle body, and the connecting part is connected to the connecting angle at the bottom of the horn; the two connecting arms are symmetrically arranged and a shock absorber is arranged just above the symmetry line of the two connecting arms, and the two ends of the shock absorber are respectively connected to the vehicle body and the connecting part in a rotational manner; the upper swing arm is a single-arm structure arranged on the connecting part and one of the connecting arms, and the shock absorber is staggered with the upper swing arm. This solution keeps the lower swing arm in an eight-shaped structure and hinges the bottom of the shock absorber to the middle of the lower swing arm connecting part and the top of the shock absorber is hinged to the vehicle body, and the upper swing arm is set as a single-arm structure and staggered with the shock absorber to provide sufficient installation position for the shock absorber, so that the specifications required for installing the shock absorber become possible, and the shock absorption performance of the vehicle body is guaranteed.

[0007] Specifically, a lower connecting angle with an axial hole is provided at the bottom of the steering knuckle, and two hinge seats are provided on the connecting part. The two hinge seats clamp the lower connecting angle at the bottom of the steering knuckle and are hinged by a hinge shaft passing through the two hinge seats and the axial hole.

[0008] Specifically, the upper swing arm includes a bottom plate and a top plate, and at least two support plates are welded between the bottom plate and the top plate. In this solution, the upper swing arm is set as a three-layer structure, which increases the strength of the upper swing arm, and even if the upper swing arm is a single-arm structure, it has sufficient strength.

[0009] Specifically, the bottom ends of the two support plates at the edge are bent to form two bent parts, and a flat-bottomed U-shaped hinge frame is welded at the two bent parts. An upper connecting angle is provided at the top of the steering knuckle, and the upper connecting angle extends into the notch of the hinge frame and is hinged to the upper connecting angle through a hinge shaft passing through the hinge frame and the upper connecting angle. The bent part is used to increase the strength of the bottom hinge.

[0010] Specifically, the upper connecting angle has a cylindrical hinge part, the bottom of the hinge frame notch is close to the surface of the hinge part, and the bottom of the two side walls of the hinge frame are provided with a bending plate for strengthening. The bending plate is used to strengthen the structural strength of the position and reduce the probability of damage at the position.

[0011] Specifically, the lower swing arm includes an upper plate body and a lower plate body, at least two reinforcing plates are arranged between the upper plate body and the lower plate body, and the reinforcing plates are welded to the upper plate body and the lower plate body. This structure is used to increase the structural strength of the lower swing arm.

[0012] Specifically, the width of the upper swing arm is greater than the width of one of the connecting arms and less than or equal to the sum of the widths of the two connecting arms. This solution ensures structural strength while avoiding interference with the shock absorber.

[0013] Specifically, a U-shaped lower seat is provided on the connecting part, the opening of the lower seat extends horizontally and faces the middle of the vehicle body, hinge holes are provided on both sides of the lower seat, and the bottom end of the shock absorber is hinged to the lower seat through a hinge shaft. This structure is used for connecting the bottom of the shock absorber, and the opening facing the middle of the vehicle body is equivalent to providing a U-shaped welding area for the lower seat, which ensures the connection strength between the lower seat and the connecting part.

[0014] Specifically, a frame is provided on the vehicle body, an upper seat is welded on the frame, the upper seat includes a flat U-shaped plate for welding at the top, two spaced hinge plates are provided at the bottom of the flat U-shaped plate, hinge holes are provided on the hinge plates, and the top of the shock absorber is hinged to the upper seat through a hinge shaft.

[0015] Specifically, a notch is provided in the middle of the flat bottom U-shaped plate and the plate is inserted into the frame through the notch and clamps the frame. The extension direction of the channel is perpendicular to the extension direction of the notch at the top of the flat bottom U-shaped plate, and the side wall of the notch is abutted against and welded to the frame. In this solution, the notch clamps the frame, and the welding area is located at two opposite side walls and the bottom of the frame during welding, so the connection is more secure.

[0016] Compared with the prior art, the advantages of the utility model are as follows: the utility model maintains the lower swing arm as an eight-shaped structure and hinges the bottom of the shock absorber to the middle of the lower swing arm connection part and the top of the shock absorber is hinged to the vehicle body, and the upper swing arm is set as a single-arm structure and the shock absorber is staggered to provide sufficient installation position for the shock absorber, making it possible to install the required specifications of the shock absorber and ensuring the shock absorbing performance of the vehicle body. In addition, the upper swing arm is set as a three-layer structure to strengthen its structural strength, so that the upper swing arm has a strong structural strength even if it is a single-arm structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described object and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 It is a rear view of the utility model;

[0019] Figure 2 It is a three-dimensional diagram of the utility model;

[0020] Figure 3 It is a three-dimensional diagram of the utility model;

[0021] Figure 4 for Figure 3 The enlarged view of the H in the middle;

[0022] Figure 5 It is a three-dimensional diagram of the utility model;

[0023] In the figure: 10, vehicle body; 101, frame; 20, lower swing arm; 201, hinged seat; 202, connecting arm; 203, connecting part; 205, upper plate; 206, lower plate; 207, reinforcing plate; 30, upper swing arm; 301, hinged frame; 3011, bending plate; 302, top plate; 303, bottom plate; 304, supporting plate; 40, steering knuckle; 401, lower connecting angle; 402, upper connecting angle; 4021, hinged part; 50, shock absorber; 501, lower seat; 502, upper seat; 5021, hinged plate; 5021, notch. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that these descriptions are merely illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0025] The rear swing arm structure of the vehicle body, such as Figure 1-5 As shown, it includes an upper swing arm 30 and a lower swing arm 20, one end of the upper swing arm 30 and the lower swing arm 20 is rotatably connected to the vehicle body 10, and the other end of the upper swing arm 30 and the lower swing arm 20 is rotatably connected to the steering knuckle 40, the lower swing arm 20 includes a connecting portion 203 in the shape of an isosceles trapezoid and two connecting arms 202 arranged on the connecting portion 203, the two connecting arms 202 are in an eight-shaped shape and are rotatably connected to the vehicle body 10, and the connecting portion 203 is connected to the connecting corner at the bottom of the ram's horn; the two connecting arms 202 are symmetrically arranged and a shock absorber 50 is arranged directly above the symmetry line of the two connecting arms 202, and the two ends of the shock absorber 50 are rotatably connected to the vehicle body 10 and the connecting portion 203 respectively; the upper swing arm 30 is a single-arm structure arranged on the connecting portion 203 and one of the connecting arms 202, and the shock absorber 50 is staggered with the upper swing arm 30. This solution maintains the lower swing arm 20 as an eight-shaped structure and hinges the bottom of the shock absorber 50 to the middle of the connecting portion 203 of the lower swing arm 20, while the top of the shock absorber 50 is hinged to the vehicle body 10. The upper swing arm 30 is set as a single-arm structure and is offset from the shock absorber 50 to provide sufficient installation position for the shock absorber 50, making it possible to install the required specifications of the shock absorber 50, thereby ensuring the shock absorption performance of the vehicle body 10.

[0026] like Figure 1-2 As shown, a lower connecting angle 401 with an axial hole is provided at the bottom of the steering knuckle 40, and two hinge seats 201 are provided on the connecting portion 203. The two hinge seats 201 clamp the lower connecting angle 401 at the bottom of the steering knuckle 40 and are hinged by a hinge axis passing through the two hinge seats 201 and the axial hole.

[0027] like Figure 5 As shown, the upper swing arm 30 includes a bottom plate 303 and a top plate 302, and at least two support plates 304 are welded between the bottom plate 303 and the top plate 302. In this solution, the upper swing arm 30 is set as a three-layer structure, which increases the strength of the upper swing arm 30, and even if the upper swing arm 30 is a single-arm structure, it has sufficient strength.

[0028] like Figure 5As shown, the bottom ends of the two support plates 304 at the edge are bent to form two bent portions, and a flat-bottomed U-shaped hinge frame 301 is welded at the two bent portions. An upper connecting angle 402 is provided at the top of the steering knuckle 40, and the upper connecting angle 402 extends into the notch of the hinge frame 301 and is hinged to the hinge frame 301 and the upper connecting angle 402 through the hinge axis passing through the hinge frame 301 and the upper connecting angle 402. The bent portion is used to increase the strength of the bottom hinge.

[0029] like Figure 5 As shown, the upper connecting angle 402 has a cylindrical hinge part 4021, the bottom of the notch of the hinge frame 301 is close to the surface of the hinge part 4021, and the bottom of the two side walls of the hinge frame 301 are provided with a bending plate 3011 for strengthening. The bending plate 3011 is used to strengthen the structural strength of the position and reduce the probability of damage at this position.

[0030] like Figure 5 As shown, the lower swing arm 20 includes an upper plate 205 and a lower plate 206, at least two reinforcing plates 207 are arranged between the upper plate 205 and the lower plate 206, and the reinforcing plates 207 are welded to the upper plate 205 and the lower plate 206. This structure is used to increase the structural strength of the lower swing arm 20.

[0031] like Figure 3-4 As shown, the width of the upper swing arm 30 is greater than the width of one of the connecting arms 202 and less than or equal to the sum of the widths of the two connecting arms 202. This solution ensures structural strength while avoiding interference with the shock absorber 50.

[0032] like Figure 3-4 As shown, a U-shaped lower seat 501 is provided on the connecting portion 203, the opening of the lower seat 501 extends horizontally and faces the middle of the vehicle body 10, and hinge holes are provided on both sides of the lower seat 501, and the bottom end of the shock absorber 50 is hinged to the lower seat 501 through a hinge axis. This structure is used for connecting the bottom of the shock absorber 50, and the opening facing the middle of the vehicle body 10 is equivalent to providing a U-shaped welding area for the lower seat 501, thereby ensuring the connection strength between the lower seat 501 and the connecting portion 203.

[0033] like Figure 1 , 3 As shown in , 4, a frame 101 is provided on the vehicle body 10, an upper seat 502 is welded to the frame 101, the upper seat 502 includes a flat U-shaped plate at the top for welding, two spaced hinge plates 5021 are provided at the bottom of the flat U-shaped plate, hinge holes are provided on the hinge plates 5021, and the top of the shock absorber 50 is hinged to the upper seat 502 through a hinge shaft.

[0034] like Figure 3-4As shown, a notch 5022 is provided in the middle of the flat bottom U-shaped plate and it is inserted into the frame 101 through the notch 5022 and clamps the frame 101. The extension direction of the channel is perpendicular to the extension direction of the notch at the top of the flat bottom U-shaped plate, and the side wall of the notch 5022 is abutted against and welded to the frame 101. In this solution, the notch 5022 clamps the frame 101, and the welding area is located at the two opposite side walls and the bottom of the frame 101 during welding, so the connection is more secure.

[0035] The above is an introduction to the rear swing arm structure of the vehicle body provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the utility model and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. The rear swing arm structure of the vehicle body comprises an upper swing arm and a lower swing arm, one end of the upper swing arm and the lower swing arm is rotatably connected to the vehicle body, and the other end of the upper swing arm and the lower swing arm is rotatably connected to the steering knuckle, characterized in that: The lower swing arm includes a connecting portion in the shape of an isosceles trapezoid and two connecting arms arranged on the connecting portion, the two connecting arms are in an eight-shaped shape and are rotatably connected to the vehicle body, and the connecting portion is connected to the connecting corner at the bottom of the horn; the two connecting arms are symmetrically arranged and a shock absorber is provided directly above the symmetry line of the two connecting arms, and the two ends of the shock absorber are rotatably connected to the vehicle body and the connecting portion respectively; the upper swing arm is a single-arm structure arranged on the connecting portion and one of the connecting arms, and the shock absorber and the upper swing arm are staggered.

2. The rear swing arm structure of the vehicle body according to claim 1, characterized in that: A lower connecting angle with an axial hole is provided at the bottom of the steering knuckle, and two hinge seats are provided on the connecting part. The two hinge seats clamp the lower connecting angle at the bottom of the steering knuckle and are hinged through a hinge shaft passing through the two hinge seats and the axial hole.

3. The rear swing arm structure of the vehicle body according to claim 1, characterized in that: The upper swing arm comprises a bottom plate and a top plate, and at least two supporting plates are welded between the bottom plate and the top plate.

4. The rear swing arm structure of the vehicle body according to claim 3, characterized in that: The bottom ends of the two support plates at the edges are bent to form two bent portions, at which flat-bottomed U-shaped articulated frames are welded, and an upper connecting angle is provided on the top of the steering knuckle. The upper connecting angle extends into the notch of the articulated frame and is articulated to the articulated frame and the upper connecting angle through an articulation axis passing through the articulated frame and the upper connecting angle.

5. The rear swing arm structure of the vehicle body according to claim 4, characterized in that: The upper connecting angle has a cylindrical hinged portion, the bottom of the hinged frame notch is in contact with the surface of the hinged portion, and the bottoms of the two side walls of the hinged frame are provided with bending plates for reinforcement.

6. The rear swing arm structure of a vehicle body according to claim 1, characterized in that: The lower swing arm comprises an upper plate body and a lower plate body, at least two reinforcing plates are arranged between the upper plate body and the lower plate body, and the reinforcing plates are welded to the upper plate body and the lower plate body.

7. The rear swing arm structure of a vehicle body according to claim 1, characterized in that: The width of the upper swing arm is greater than the width of one of the connecting arms and less than or equal to the sum of the widths of the two connecting arms.

8. The rear swing arm structure of a vehicle body according to claim 1, characterized in that: A U-shaped lower seat body is arranged on the connecting part, the opening of which extends horizontally toward the middle of the vehicle body, hinge holes are arranged on both sides of the lower seat body, and the bottom end of the shock absorber is hinged to the lower seat body through a hinge shaft.

9. The rear swing arm structure of the vehicle body according to claim 8, characterized in that: The vehicle body is provided with a frame body, on which an upper seat body is welded, the upper seat body comprising a flat bottom U-shaped plate for welding at the top, two spaced hinge plates at the bottom of the flat bottom U-shaped plate, hinge holes are arranged on the hinge plates and the top of the shock absorber is hinged to the upper seat body through a hinge shaft.

10. The rear swing arm structure of a vehicle body according to claim 9, characterized in that: A notch is provided in the middle of the flat bottom U-shaped plate and it is inserted into the frame through the notch to clamp the frame. The extension direction of the channel is perpendicular to the extension direction of the notch on the top of the flat bottom U-shaped plate, and the side wall of the notch is abutted against and welded to the frame.

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