A leaf spring hanger bush structure

Abstract

The utility model relates to a kind of plate spring lug bush structure, belong to automobile field, including first bush (1) and second bush (2), the first bush (1) includes first sleeve (3) and is equipped on first sleeve (3) first flange (4), first flange (4) is equipped with first boss (5), the second bush (2) includes second sleeve (6) and is equipped on second sleeve (6) second flange (7), second flange (7) is equipped with second boss (8).First sleeve (3) and second sleeve (6) are connected by lug pin shaft (9), first lug pressing plate (10) and second lug pressing plate (11) are respectively equipped at the both ends of lug pin shaft (9), boss on flange face surface, can prevent flange face edge stress concentration and the effect of interference fastening, improve the fatigue endurance of lug bush, reduce the risk of cracking.

Description

Technical Field

[0001] This utility model belongs to the automotive field, specifically, it relates to a leaf spring hanger bushing structure. Background Technology

[0002] The leaf spring hanger bushing is a commonly used bushing in leaf spring suspensions. It mainly connects the leaf spring to the longitudinal beam of the vehicle frame and dampens the transmission of suspension vibration to the vehicle body. During actual vehicle movement, the hanger bushing is not only subjected to the vertical support force of the entire vehicle, but also undergoes torsional motion due to the elastic deformation of the leaf spring, thereby generating torsional torque. In actual vehicle use, cracking problems are prone to occur at the edge of the bushing flange, which leads to customer complaints.

[0003] Chinese patent CN218367295U, published on January 24, 2023, discloses a leaf spring rear hanger bushing assembly, comprising: a leaf spring body, with rear hanger plates fixedly connected to both ends of the leaf spring body; a circular hole in the center of the rear hanger plate; a pressing plate fixedly connected to the inner wall of the circular hole in the rear hanger plate; pressing blocks symmetrically positioned about the center of the circular hole in the rear hanger plate; and a bushing pressed between the pressing blocks and the pressing plate. This invention fails to solve the problem of cracking at the flange edge of the bushing after elastic deformation of the leaf spring, resulting in low product durability and reliability. Utility Model Content

[0004] The present invention aims to provide a novel leaf spring lug bushing structure that is simple in structure and has high product durability and reliability.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A leaf spring lifting lug bushing structure includes a first bushing and a second bushing. The first bushing includes a first sleeve and a first flange disposed on the first sleeve. A first boss is provided on the flange face of the first flange. The second bushing includes a second sleeve and a second flange disposed on the second sleeve. A second boss is provided on the flange face of the second flange. The first sleeve and the second sleeve are connected by a lifting lug pin.

[0007] The lifting lug pin has a first lifting lug pressure plate and a second lifting lug pressure plate at both ends. The first lifting lug pressure plate is connected to the first flange, and the second lifting lug pressure plate is connected to the second flange.

[0008] One end of the lifting lug pin is provided with a nut, which is connected to the first lifting lug pressure plate, and the other end of the lifting lug pin is connected to the second lifting lug pressure plate.

[0009] The outer walls of the first and second sleeves are connected to the vehicle body sleeves, and the first and second flanges are respectively connected to both ends of the vehicle body sleeves.

[0010] The first bushing and the lifting lug pin are interference fits, and the second bushing and the lifting lug pin are interference fits.

[0011] The first sleeve and the second sleeve are interference fit.

[0012] The first boss is annular, and the second boss is annular; the first sleeve is cylindrical, and the second sleeve is cylindrical.

[0013] The outer diameter of the first boss is smaller than the outer diameter of the first flange, and the outer diameter of the second boss is smaller than the outer diameter of the second flange.

[0014] The first flange has a chamfer, and the second flange has a chamfer.

[0015] The technical effects of this utility model are as follows: by adding an extra annular boss to the flange surface of the lifting lug bushing, stress concentration at the edge of the flange surface can be prevented, the fatigue durability of the lifting lug bushing can be improved, the risk of cracking can be reduced, and the maintenance cost of repeatedly replacing the lifting lug bushing can be reduced. After assembly, the boss can also play the role of interference fastening. This utility model uses two lifting lug bushings and lifting lug pins in combination, and the structure is simple. Attached Figure Description

[0016] This manual includes the following figures, which illustrate the following:

[0017] Figure 1 This is a schematic diagram of the overall structure of a leaf spring lifting lug bushing structure.

[0018] Figure 2 for Figure 1 Schematic diagram of the first bushing structure.

[0019] Figure 3 for Figure 2 The front view.

[0020] Figure 4 for Figure 2 Top view.

[0021] The markings in the diagram are as follows: 1. First bushing; 2. Second bushing; 3. First sleeve; 4. First flange; 5. First boss; 6. Second sleeve; 7. Second flange; 8. Second boss; 9. Lifting lug pin; 10. First lifting lug pressure plate; 11. Second lifting lug pressure plate; 12. Nut; 13. Body sleeve. Detailed Implementation

[0022] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of this utility model, and to facilitate its implementation.

[0023] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a leaf spring lifting lug bushing structure includes a first bushing 1 and a second bushing 2. The first bushing 1 includes a first sleeve 3 and a first flange 4 mounted on the first sleeve 3. A first boss 5 is provided on the flange face of the first flange 4. The second bushing 2 includes a second sleeve 6 and a second flange 7 mounted on the second sleeve 6. A second boss 8 is provided on the flange face of the second flange 7. The first sleeve 3 and the second sleeve 6 are connected by a lifting lug pin 9. Through the cooperation of the first bushing 1 and the second bushing 2, the flange faces at both ends of the overall bushing structure are provided with bosses. The detachable bushing is suitable for replacement and convenient for assembly. The bosses on the flange face surface can prevent stress concentration at the flange edge, improve the fatigue durability of the lifting lug bushing, and reduce the risk of cracking.

[0024] The lifting pin 9 has a first lifting plate 10 and a second lifting plate 11 at both ends. The first lifting plate 10 is connected to the first flange 4, and the second lifting plate 11 is connected to the second flange 7. The lifting pin 9 is fitted on the outer wall of the first bushing 1 and the second bushing 2. One end of the lifting pin 9 has the first lifting plate 10 in contact with the first flange 4, and the other end of the lifting pin 9 has the second lifting plate 11 in contact with the second flange 7. The first boss 5 is located between the first lifting plate 10 and the first flange 4, which serves as an interference fit. The second boss 8 is located between the second lifting plate 11 and the second flange 7, which also serves as an interference fit.

[0025] One end of the lifting lug pin 9 is provided with a nut 12, which is connected to the first lifting lug pressure plate 10. The other end of the lifting lug pin 9 is connected to the second lifting lug pressure plate 11. The nut 12 at one end of the lifting lug pin 9 is used for fastening. The lifting lug pin 9, the first bushing 1 and the second bushing 2 are fastened by the nut 12. The overall structure is simple and the cost is low.

[0026] The outer walls of the first sleeve 3 and the second sleeve 4 are connected to the body sleeve 13. The first flange 4 and the second flange 7 are respectively connected to both ends of the body sleeve 13. The first sleeve 3 and the second sleeve 4 are located inside the inner wall of the body sleeve 13. The first flange 4 and the second flange 7 are respectively connected to both ends of the body sleeve 13, which makes the first bushing 1 and the second bushing 2 more secure.

[0027] The first bushing 1 and the lifting lug pin 9 are interference fits, and the second bushing 2 and the lifting lug pin 9 are interference fits. The first boss 5 on the first bushing 1 is located between the first lifting lug pressure plate 10 and the first flange 4, which serves as an interference fit. The second boss 8 on the second bushing 2 is located between the second lifting lug pressure plate 11 and the second flange 7, which also serves as an interference fit.

[0028] The first sleeve 3 and the second sleeve 6 are interference fits. The first sleeve 3 and the second sleeve 6 are interference fits and have a compression amount.

[0029] The first protrusion 5 is annular, and the second protrusion 8 is annular; the first sleeve 3 is cylindrical, and the second sleeve 6 is cylindrical. The annular shape of the first protrusion 5 and the second protrusion 8 provides better force distribution.

[0030] The outer diameter of the first boss 5 is smaller than the outer diameter of the first flange 4, and the outer diameter of the second boss 8 is smaller than the outer diameter of the second flange 7. In this utility model, the outer diameter of the boss is designed to be about 80% of the outer diameter of the flange face, and can be adjusted appropriately according to the inner diameter.

[0031] Both the first flange 4 and the second flange 7 are chamfered. Chamfering reduces deformation and cracking, further reduces stress concentration, and improves the fatigue durability of the lifting lug bushing.

[0032] The working principle of this utility model is as follows: A leaf spring lifting lug bushing structure includes a first bushing 1 and a second bushing 2. The first bushing 1 includes a first sleeve 3 and a first flange 4 provided on the first sleeve 3. The first flange 4 is provided with a first boss 5. The second bushing 2 includes a second sleeve 6 and a second flange 7 provided on the second sleeve 6. The second flange 7 is provided with a second boss 8. The flange faces at both ends of the overall bushing structure are provided with bosses. The bosses on the flange face surfaces can prevent stress concentration at the flange edge, improve the fatigue durability of the lifting lug bushing, and reduce the risk of cracking. The first sleeve 3 and the second sleeve 6 are connected by a lifting lug pin 9. The lifting lug pin 9 has a first lifting lug pressure plate 10 and a second lifting lug pressure plate 11 at both ends. The first lifting lug pressure plate 10 is connected to the first flange 4, and the second lifting lug pressure plate 11 is connected to the second flange 7. A nut 12 is provided at one end of the lifting lug pin 9, which is connected to the first lifting lug pressure plate 10 for fastening. The other end of the lifting lug pin 9 is connected to the second lifting lug pressure plate 11. The outer walls of the first sleeve 3 and the second sleeve 4 are connected to the vehicle body sleeve 13. The first boss 5 is located between a lifting lug plate 10 and the first flange 4, which serves as an interference fit. The second boss 8 is located between the second lifting lug plate 11 and the second flange 7, which also serves as an interference fit. The overall structure is simple and the cost is low.

[0033] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A leaf spring hanger bushing structure characterized by: It includes a first bushing (1) and a second bushing (2). The first bushing (1) includes a first sleeve (3) and a first flange (4) provided on the first sleeve (3). A first boss (5) is provided on the flange surface of the first flange (4). The second bushing (2) includes a second sleeve (6) and a second flange (7) provided on the second sleeve (6). A second boss (8) is provided on the flange surface of the second flange (7). The first sleeve (3) and the second sleeve (6) are connected by a lifting lug pin (9). The lifting lug pin (9) is provided with a first lifting lug pressure plate (10) and a second lifting lug pressure plate (11) at both ends. The first lifting lug pressure plate (10) is connected to the first flange (4), and the second lifting lug pressure plate (11) is connected to the second flange (7). The first boss (5) is located between the first lifting lug plate (10) and the first flange (4), and the second boss (8) is located between the second lifting lug plate (11) and the second flange (7); One end of the lifting lug pin (9) is provided with a nut (12), the nut (12) is connected to the first lifting lug pressure plate (10), and the other end of the lifting lug pin (9) is connected to the second lifting lug pressure plate (11).

2. The spring eye bush structure according to claim 1, wherein: The outer wall of the first sleeve (3) and the outer wall of the second sleeve (6) are connected to the body sleeve (13), and the first flange (4) and the second flange (7) are respectively connected to both ends of the body sleeve (13).

3. The spring eye bush structure according to claim 2, wherein: The first bushing (1) and the lifting lug pin (9) are interference fits, and the second bushing (2) and the lifting lug pin (9) are interference fits.

4. The leaf spring lifting lug bushing structure according to claim 3, characterized in that: The first sleeve (3) and the second sleeve (6) are interference fit.

5. A leaf spring lifting lug bushing structure according to any one of claims 1-4, characterized in that: The first boss (5) is annular, and the second boss (8) is annular; the first sleeve (3) is cylindrical, and the second sleeve (6) is cylindrical.

6. The leaf spring lifting lug bushing structure according to claim 1, characterized in that: The outer diameter of the first boss (5) is smaller than the outer diameter of the first flange (4), and the outer diameter of the second boss (8) is smaller than the outer diameter of the second flange (7).

7. The leaf spring lifting lug bushing structure according to claim 1, characterized in that: The first flange (4) is chamfered, and the second flange (7) is chamfered.

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