Subframe bushing

Abstract

The utility model relates to an auxiliary frame bushing which comprises an inner pipe and a rubber layer sleeved on the periphery of the inner pipe, the inner pipe comprises a body, the end face of one axial end of the body is a positioning end face of the body, a protrusion used for limiting displacement of the rubber layer is arranged on the positioning end face, and the protrusion protrudes out of the positioning end face in the axial direction of the body. The protrusion is partially defined by a first side face, a second side face, a third side face, a fourth side face, an outer end face and a positioning end face, the first side face, the second side face, the third side face and the fourth side face are sequentially connected end to end to form an annular face, the positioning end face is connected to one end of the annular face, and the outer end face is connected to the other end of the annular face and is partially opposite to the positioning end face. According to the utility model, through forced limiting, larger preload can be borne, the rubber layer is ensured not to be damaged, the comfort of a vehicle is improved, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of automobile parts, and particularly relates to a comfort subframe bushing improved based on finite element analysis. Background Art

[0002] In an automobile, the vibration of the wheels is effectively suppressed mainly through the double filtration of the link bushing and the subframe bushing, thereby improving the comfort of the vehicle.

[0003] The inner tube structure in the existing subframe bushing is as shown in Appendix Figure 1 and Appendix Figure 2 It lacks a limiting structure and is difficult to bear a high preload. The rubber layer in the subframe bushing is prone to breakage, thereby affecting the comfort of the vehicle.

[0004] With the continuous development of automobile technology, there are more and more various medium and large-sized vehicles, and the vehicle body is getting heavier and heavier. A subframe bushing that can bear a high preload has become a necessary condition for improving the comfort of the vehicle. Summary of the Invention

[0005] The purpose of the utility model is to provide a subframe bushing that can bear a high preload, thereby improving the comfort of the vehicle.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A subframe bushing includes an inner tube and a rubber layer sleeved on the outer periphery of the inner tube. The inner tube includes a body. One end face of the body in the axial direction is its positioning end face. A protrusion for restricting the displacement of the rubber layer is arranged on the positioning end face. The protrusion protrudes from the positioning end face along the axial direction of the body. The protrusion is surrounded by a first side face, a second side face, a third side face, a fourth side face, an outer end face and a part of the positioning end face. The first side face, the second side face, the third side face and the fourth side face are sequentially connected end to end to form an annular surface. The positioning end face is connected to one end of the annular surface. The outer end face is connected to the other end of the annular surface and is opposite to a part of the positioning end face.

[0008] Two such protrusions are symmetrically arranged on the positioning end face.

[0009] The outer end face is trapezoidal. The upper base of the trapezoid is correspondingly connected to the first side face. The lower base of the trapezoid is correspondingly connected to the third side face. The two waists of the trapezoid are respectively correspondingly connected to the second side face and the fourth side face. The third side face is located between the first side face and the axis of the body. The length of the third side face is longer than the length of the first side face.

[0010] A groove recessed towards the first side is formed on the third side, and a convex block protruding towards the third side is provided on the bottom surface of the groove.

[0011] The convex block is semi-cylindrical.

[0012] The height by which the convex block protrudes from the bottom surface of the groove is lower than the height of the third side relative to the bottom surface of the groove.

[0013] A through hole is formed in the convex block, and the axial direction of the through hole is parallel to the axial direction of the body.

[0014] The body includes a first part, a second part, and two additional parts. The length and width of the first part remain unchanged in the direction perpendicular to its axis. The length of the second part gradually increases and the width remains unchanged in the direction perpendicular to its axis. The second part is coaxially connected to one end of the first part to form the main body. The second part is connected to the first part at the end with a smaller length in the direction perpendicular to its axis, and the end with a larger length in the direction perpendicular to its axis forms the positioning end face. The two additional parts are symmetrically arranged on both axial sides of the main body, and the additional parts connect the first part and the second part.

[0015] The length of the additional part in its axial direction is less than the length of the main body. One end face of the additional part is flush with the positioning end face, and the other end of the additional part extends to the middle of the first part.

[0016] An additional hole is formed in the additional part, and the axial direction of the additional hole is parallel to the axial direction of the main body.

[0017] Due to the application of the above technical solution, the present utility model has the following advantages compared with the prior art: The present utility model can withstand a greater preload through forced limiting and ensure that the rubber layer will not be damaged, improving the comfort of the vehicle and extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attached Figure 1 is a three-dimensional schematic view of the inner tube in an existing subframe bushing.

[0019] Attached Figure 2 is a front view schematic view of the inner tube in an existing subframe bushing.

[0020] Attached Figure 3 is a three-dimensional schematic view of the inner tube in the subframe bushing of the present invention.

[0021] Attached Figure 4 is a front view schematic view of the inner tube in the subframe bushing of the present invention.

[0022] In the above drawings: 1. Body; 2. Protrusion; 3. Pipe hole; 4. Positioning end face; 5. Groove; 6. Convex block; 7. Through hole; 8. First part; 9. Second part; 10. Additional part; 11. Additional hole. Detailed implementation mode

[0023] The following further describes the present utility model in combination with the embodiments shown in the drawings.

[0024] Embodiment 1: A subframe bushing includes structures such as an inner tube, a rubber layer sleeved on the outer periphery of the inner tube, and an outer tube sleeved on the outer periphery of the rubber layer.

[0025] As shown in the attached Figure 3 and the attached Figure 4 As shown, the inner tube includes a body 1, and a pipe hole 3 is provided at the axis of the body 1. One end of the body 1 in the axial direction forms a positioning end face 4 of the body 1. On this positioning end face 4, a plurality of protrusions 2 are provided, and these protrusions 2 protrude from the positioning end face 4 along the axial direction of the body 1, so as to limit the displacement of the rubber layer.

[0026] In this embodiment, two protrusions 2 are symmetrically arranged on the positioning end face 4, and the two protrusions 2 are respectively located on both sides of the axis of the body 1. Each protrusion 2 is surrounded by a first side face, a second side face, a third side face, a fourth side face, an outer end face and a part of the positioning end face 4. The first side face, the second side face, the third side face and the fourth side face are connected end to end in sequence to form an annular surface. The positioning end face 4 is connected to one end of the annular surface, that is, at the positioning end face 4, the protrusion 2 is integrally connected to the body 1. The outer end face is connected to the other end of the annular surface and is opposite to a part of the positioning end face 4.

[0027] The contour of the outer end face is trapezoidal, and the edge of the outer end face can be straight or have a certain arc. The upper base of the trapezoid corresponds to the connection with the first side face, the lower base of the trapezoid corresponds to the connection with the third side face, and the two waists of the trapezoid respectively correspond to the connection with the second side face and the fourth side face. The third side face is located between the first side face and the axis of the body 1. The first side face, the second side face, the third side face and the fourth side face have the same height, and the length of the third side face is longer than the length of the first side face. A groove 5 recessed in the direction of the first side face is provided on the third side face. The groove 5 is generally rectangular and extends along the axial direction of the body 1. A convex block 6 protruding in the direction of the third side face is provided on the groove bottom surface of the groove 5. The convex block 6 can be semi-cylindrical. The height of the convex block 6 protruding from the groove bottom surface is lower than the height of the third side face relative to the groove bottom surface. A through hole 7 is provided in the convex block 6. The axial direction of the through hole 7 is parallel to the axial direction of the body 1, and the center of the through hole 7 is located at the center of the semi-cylindrical convex block 6.

[0028] The body 1 includes a first part 8, a second part 9, and two additional parts 10. The cross-section of the first part 8 and the second part 9 in the direction perpendicular to their axes is approximately a rounded rectangle. The length and width of the first part 8 remain unchanged in the direction perpendicular to its axis. The length of the second part 9 gradually increases in the direction perpendicular to its axis while the width remains unchanged, and the width of the first part 8 is equal to the width of the second part 9. The second part 9 is coaxially connected to one end of the first part 8 to form the main body. The second part 9 is connected to the first part 8 at the end with a smaller length in the direction perpendicular to its axis, and a positioning end face 4 is formed at the end with a larger length in the direction perpendicular to its axis of the second part 9. The two additional parts 10 are symmetrically arranged on both axial sides of the main body, and the additional parts 10 connect the first part 8 and the second part 9. The length of the additional part 10 in its axial direction is less than the length of the main body. One end face of the additional part 10 is flush with the positioning end face 4, and the other end of the additional part 10 extends to the middle of the first part 8 and is transitionally connected to the first part 8 through an inclined surface. Two square additional holes 11 are provided on the additional part 10, and the axial direction of the additional holes 11 is parallel to the axial direction of the main body.

[0029] In the above solution, by using the structure of the protrusion 2, when the subframe bushing bears an axial preload, the protrusion 2 structure can prevent the rubber layer from having large displacements and large deformations, so that the bushing can bear a greater preload and ensure that the rubber layer will not break or be damaged, which conforms to the design concept of heavy-duty passenger cars and commercial vehicles. The inner tube uses lightweight aluminum, and the groove 5 structure on the protrusion 2 can reduce the amount of metal material used, lower the production cost, and at the same time can be adapted to the mating part, adding forced limit to the bushing, so that there will be no misalignment during vehicle driving. After the subframe bushing bears a large preload, the axial stiffness will increase, improving the smoothness of the vehicle when passing through steep roads, thereby increasing comfort. Based on the finite element technology analysis, the improved subframe bushing not only has better stiffness and is within a reasonable range, but also greatly improves the durability performance and extends the service life.

[0030] The above embodiments are only used to illustrate the technical concept and features of the present invention, and their purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A subframe bushing, comprising an inner tube and a rubber layer sleeved on the outer circumference of the inner tube, characterized in that: The inner tube includes a body, an end face of one axial end of the body being a positioning end face, a protrusion for limiting the displacement of the rubber layer being arranged on the positioning end face, the protrusion protruding from the positioning end face along the axial direction of the body, the protrusion being surrounded by a first side face, a second side face, a third side face, a fourth side face, an outer end face and a part of the positioning end face, the first side face, the second side face, the third side face and the fourth side face being connected end to end in sequence to form an annular face, the positioning end face being connected to one end of the annular face, the outer end face being connected to the other end of the annular face and being opposite to the part of the positioning end face.

2. The subframe bushing according to claim 1, characterized in that: The two protrusions are symmetrically arranged on the positioning end surface.

3. The subframe bushing according to claim 1, characterized in that: The outer end face is a trapezoid, the upper base of the trapezoid is connected to the first side face, the lower base of the trapezoid is connected to the third side face, the two waists of the trapezoid are connected to the second side face and the fourth side face respectively, the third side face is located between the first side face and the axis of the main body, and the length of the third side face is longer than the length of the first side face.

4. The subframe bushing according to claim 3, characterized in that: The third side surface is provided with a groove recessed toward the first side surface, and the bottom surface of the groove is provided with a convex block protruding toward the third side surface.

5. The subframe bushing according to claim 4, characterized in that: The protrusion is in a semi-cylindrical shape.

6. The subframe bushing according to claim 4, characterized in that: The height of the protrusion protruding from the bottom surface of the groove is lower than the height of the third side surface relative to the bottom surface of the groove.

7. The subframe bushing according to claim 4, characterized in that: The convex block is provided with a through hole, and the axial direction of the through hole is parallel to the axial direction of the body.

8. The subframe bushing according to any one of claims 1 to 7, characterized in that: The main body includes a first part, a second part and two additional parts. The length and width of the first part in a direction perpendicular to its axial direction are unchanged. The length of the second part in a direction perpendicular to its axial direction gradually increases and the width remains unchanged. The second part is coaxially connected to one end of the first part to form the main body. The second part is connected to the first part at the end with a smaller length in a direction perpendicular to its axial direction. The second part forms the positioning end face at the end with a larger length in a direction perpendicular to its axial direction. The two additional parts are symmetrically arranged on both sides of the axial direction of the main body, and the additional parts connect the first part and the second part.

9. The subframe bushing according to claim 8, characterized in that: The length of the additional part in the axial direction is smaller than the length of the main body, one end face of the additional part is flush with the positioning end face, and the other end of the additional part extends to the middle of the first part.

10. The subframe bushing according to claim 9, characterized in that: The additional part is provided with an additional hole, and the axial direction of the additional hole is parallel to the axial direction of the main body.

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