A rear leaf spring assembly

Abstract

The utility model relates to the field of steel plate spring, specifically disclose a rear steel plate spring assembly, including rear steel plate spring body, still include: clamp, the sleeve is located on rear steel plate spring body, connecting piece, install on rear steel plate spring body, the clamp is connected with rear steel plate spring body through connecting piece, be equipped with movable cavity on connecting piece, the connecting head is located in movable cavity, and can be along movable cavity opposite activity, second bolt, install on the clamp, and with connecting head screw connection, in the utility model, through connecting piece synchronous deformation with leaf spring, connecting head can along movable cavity adaptation leaf spring deformation direction relative sliding, through relative activity absorption leaf spring deformation produces the force and displacement, avoid directly transmission to bolt hole periphery, the through -hole of movable cavity bottom wall forms the radial location to connecting head, ensure that it only along the preset direction activity, dispersed local stress.

Description

Technical Field

[0001] This utility model belongs to the field of leaf spring technology, specifically relating to a rear leaf spring assembly. Background Technology

[0002] As a core load-bearing component of the non-independent suspension system of heavy-duty vehicles such as commercial vehicles and construction machinery, the rear leaf spring assembly plays a crucial role in limiting the lateral movement of the leaf springs during vehicle operation. The rear leaf spring assembly must withstand the dynamic loads brought about by the vehicle's own weight, the load weight, and complex road conditions over a long period of time. When the load is applied to the leaf spring assembly, the main leaf will bend and deform first, and the secondary leaf will bend synchronously with the main leaf, with a slight relative sliding between the leaves, so as to absorb vibration energy and transmit support force through deformation.

[0003] A search revealed a rear leaf spring assembly with publication number CN212827744U, specifically relating to the field of automotive parts. The assembly includes seven leaf springs, two lugs, and two spring clips. The seven leaf springs are stacked sequentially from top to bottom, and their lengths increase from bottom to top.

[0004] The existing clamp and spring are rigidly connected by bolts. The force and displacement generated by the deformation of the spring are directly transmitted to the connection between the clamp and the spring, causing stress concentration around the bolt hole at the connection. The stress concentration area is prone to wear, and the increased wear can induce microcracks and shorten the life of the assembly. Utility Model Content

[0005] The purpose of this utility model is to provide a rear leaf spring assembly to solve the problem mentioned in the background art, where the clamp and the spring are rigidly connected by bolts, and the force and displacement generated by the deformation of the spring are directly transmitted to the connection between the clamp and the spring, causing stress concentration around the bolt hole at the connection.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A rear leaf spring assembly includes a rear leaf spring body and further includes:

[0008] The clamp is fitted onto the rear leaf spring body;

[0009] A connector is installed on the rear leaf spring body. The clamp is connected to the rear leaf spring body through the connector. The connector is provided with a movable cavity.

[0010] The connector is located inside the movable cavity and can move relative to it along the movable cavity;

[0011] The second bolt is installed on the clamp and threaded to the connector head to movably connect the clamp to the rear leaf spring body.

[0012] In one embodiment, a mounting groove is provided at the bottom of the rear leaf spring body, and the connector is installed in the mounting groove.

[0013] In one embodiment, the bottom wall of the movable cavity has a through hole, and one end of the connector extends out of the through hole.

[0014] Preferably, a third elastic element is installed on the inner wall of the movable cavity, and the third elastic element is connected to the connector.

[0015] In one embodiment, the third elastic element is annular and sleeved on the connector head, with the third elastic element located between the connector head and the inner wall of the movable cavity.

[0016] In one embodiment, the clamp includes:

[0017] The first elastic element is installed on the clamp and is located between the bottom of the rear leaf spring body and the clamp.

[0018] In a preferred embodiment, the clamp further includes:

[0019] The groove is formed on the clamp;

[0020] A buffer plate is installed in the groove, and one side of the buffer plate is in contact with the rear leaf spring body;

[0021] The second elastic element is installed between the buffer plate and the inner wall of the groove.

[0022] In a preferred embodiment, the number of clamps is at least two.

[0023] In one embodiment, the rear leaf spring body is composed of several springs, which are stacked sequentially from top to bottom, and the length of the springs increases from bottom to top.

[0024] In one embodiment, the rear leaf spring body includes:

[0025] The first bolt passes through several spring plates sequentially from bottom to top;

[0026] The nut is threaded onto the first bolt.

[0027] This utility model provides a rear leaf spring assembly. Compared with the prior art, it has the following advantages: The connector deforms synchronously with the leaf spring, allowing the connector to slide relative to the leaf spring along the direction of deformation within the movable cavity. This relative movement absorbs the force and displacement generated by the leaf spring deformation, preventing the load from being directly transmitted to the bolt hole periphery. The through-hole in the bottom wall of the movable cavity provides radial restraint to the connector, ensuring it moves only in a preset direction and dispersing local stress. A third annular elastic element, fitted between the connector and the inner wall of the movable cavity, absorbs the impact energy during connector sliding using its own elastic deformation, reducing rigid collisions between components. The first elastic element between the clamp and the bottom of the leaf spring converts rigid impact into elastic deformation, mitigating vertical load damage. The second elastic element in the clamp groove, in conjunction with the buffer plate, absorbs the impact on the clamp caused by leaf spring deformation. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0029] Figure 2 This is a three-dimensional structural diagram from another perspective of the present invention.

[0030] Figure 3 This is a partial cross-sectional view of the rear leaf spring body proposed in this utility model.

[0031] Figure 4 This is a schematic diagram of the clamp and connector structure proposed in this utility model.

[0032] Figure 5 This is a schematic cross-sectional view of the clamp and connector proposed in this utility model.

[0033] The reference numerals in the figure are as follows: 100, rear leaf spring body; 101, first bolt; 102, nut; 200, clamp; 201, buffer plate; 202, groove; 203, first elastic element; 204, second elastic element; 300, connector; 301, second bolt; 302, movable cavity; 303, connector head; 304, third elastic element. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] Reference Figures 1-5 A rear leaf spring assembly, including a rear leaf spring body 100, and further comprising:

[0036] Clamp 200 is fitted onto the rear leaf spring body 100;

[0037] The connector 300 is installed on the rear leaf spring body 100. The clamp 200 is connected to the rear leaf spring body 100 through the connector 300. The connector 300 is provided with a movable cavity 302.

[0038] The connector 303 is located inside the movable cavity 302 and can move relative to the movable cavity 302.

[0039] The second bolt 301 is installed on the clamp 200 and threadedly connected to the connector 303 to movably connect the clamp 200 to the rear leaf spring body 100.

[0040] In the above technical solution, based on the characteristic that the leaf spring will bend and deform when it is under force and there is a slight relative sliding between the leaves, by setting a connector 300 with a movable cavity 302, a connector 303 that can move in the movable cavity 302, and a second bolt 301 that connects the clamp 200 and the connector 303, the connection between the clamp 200 and the rear leaf spring body 100 is changed from a rigid fixed connection to a movable connection that can adapt to deformation. When the leaf spring is under force and deforms, the connector 300 moves synchronously with the leaf spring, and the connector 303 can slide relative to the leaf spring along the extension direction of the movable cavity 302. By absorbing the displacement caused by the deformation of the leaf spring through relative movement, the second bolt 301 and the clamp 200 do not need to bear the combined load under rigid constraint, thus dispersing stress and avoiding excessive wear and cracks in the stress concentration area.

[0041] Specifically, the connector 303 moves relative to the movable cavity 302 of the connector 300, allowing the clamp 200 to form a movable connection with the rear leaf spring body 100. When the spring is subjected to bending deformation and relative sliding occurs between the leaves, the clamp 200 and the spring are allowed to undergo adaptive relative displacement. This avoids stress concentration on the clamp 200 contact surface and around the bolt holes caused by direct load transmission in a rigid connection. The clamp 200 can maintain the lateral restraint function on the spring assembly through the movable connection, reducing abnormal noise caused by structural loosening and improving the overall stability of the rear leaf spring assembly and vehicle driving safety.

[0042] The bottom of the rear leaf spring body 100 is provided with an installation groove, and the connector 300 is installed in the installation groove.

[0043] The bottom wall of the movable cavity 302 has a through hole, and one end of the connector 303 extends out of the through hole.

[0044] The through hole in the bottom wall of the movable cavity 302 provides an extension channel for the connector 303. After one end of the connector 303 extends out of the through hole, it can be connected to the second bolt 301 from below the rear leaf spring body 100 during assembly. The hole wall of the through hole can form a radial limit on the extended connector 303, preventing the connector 303 from moving in the movable cavity 302 in a direction perpendicular to the deformation of the spring, and ensuring that the connector 303 only moves in the preset deformation adaptation direction of the movable cavity 302.

[0045] A third elastic element 304 is installed on the inner wall of the movable cavity 302, and the third elastic element 304 is connected to the connector 303. The third elastic element 304 is annular and is sleeved on the connector 303. The third elastic element 304 is located between the connector 303 and the inner wall of the movable cavity 302.

[0046] Specifically, by setting a ring-shaped third elastic element 304 between the inner wall of the movable cavity 302 and the connector 303, the third elastic element 304 can absorb the impact load generated when the connector 303 moves relative to the movable cavity 302 using its own elastic deformation, reducing the rigid collision between the connector 303 and the inner wall of the movable cavity 302, while weakening vibration transmission and reducing abnormal noise caused by component friction and collision; the ring-shaped structure can evenly distribute elastic force along the outer periphery of the connector 303, and when the connector 303 is subjected to lateral load, it can limit the excessive displacement of the connector 303 through circumferential uniform elastic support. The third elastic element 304 is made of rubber or silicone.

[0047] The clamp 200 includes:

[0048] The first elastic element 203 is installed on the clamp 200, and the first elastic element 203 is located between the bottom of the rear leaf spring body 100 and the clamp 200.

[0049] Groove 202 is formed on clamp 200;

[0050] A buffer plate 201 is installed in a groove 202, and one side of the buffer plate 201 is in contact with the rear leaf spring body 100.

[0051] The second elastic element 204 is installed between the buffer plate 201 and the inner wall of the groove 202.

[0052] The number of clamps 200 is at least two.

[0053] In the above technical solution, the first elastic element 203 is a rubber gasket, or a silicone gasket; the second elastic element 204 is an elastic sheet, or a spring; the clamp 200 has gaps between its upper and lower parts and the rear leaf spring body 100, and the upper and lower gaps are supported and buffered by the first elastic element 203 and the buffer plate 201, respectively. When the rear leaf spring body 100 is deformed by force, the compressibility of the first elastic element 203 is used to convert rigid impact into elastic deformation, thereby alleviating the damage of vertical load to the clamp 200 and the bottom of the spring. The groove 202 provides installation space for the buffer plate 201 and the second elastic element 204. The buffer plate 201 can increase the force-bearing area by directly contacting the spring. The second elastic element 204 is arranged between the buffer plate 201 and the inner wall of the groove 202. When the spring is deformed, it can convert rigid impact into elastic deformation. At the same time, the elastic rebound force keeps the buffer plate 201 in contact with the spring, maintaining stable constraint.

[0054] The rear leaf spring body 100 is composed of several springs, which are stacked sequentially from top to bottom, and the length of the springs increases sequentially from bottom to top. The rear leaf spring body 100 includes: a first bolt 101, which passes through several springs sequentially from bottom to top; and a nut 102, which is threaded onto the first bolt 101.

[0055] When the vehicle is in motion, the rear leaf spring assembly bears a load. The load acts on the rear leaf spring body 100, and each leaf spring will undergo bending deformation in tandem according to its length difference. During the deformation of the leaf spring, the connector 300 installed in the mounting groove at the bottom of the body moves synchronously with the leaf spring. Since the clamp 200 is sleeved on the body and connected to the body through the connector 300, the displacement generated by the deformation of the leaf spring will be transmitted to the movable cavity 302 of the connector 300. At this time, the connector 303 in the movable cavity 302 slides relative to the body along the preset deformation adaptation direction of the movable cavity 302. When the connector 303 moves, the annular third elastic element 304 between the connector 303 and the inner wall of the movable cavity 302 undergoes elastic deformation simultaneously, absorbing the impact load when the connector 303 slides, reducing the rigid collision between the connector 303 and the movable cavity 302, and weakening the vibration transmission. When the clamp 200 and the spring move relative to each other, the clamp 200 will drive the second bolt 301 to move together with the connector 303 in the movable cavity 302, so that the clamp 200 and the body remain movable, avoiding stress concentration caused by direct load transmission in rigid connection.

[0056] During this process, the clamp 200 itself plays a buffering and restraining role. The first elastic element 203 between the clamp 200 and the bottom of the body is compressed due to the vertical deformation of the body, which converts the rigid impact in the vertical direction into elastic deformation, thus alleviating the damage of the vertical load to the clamp 200 and the bottom of the spring. The buffer plate 201 in the groove 202 of the clamp 200 is always in contact with the spring. When the spring is deformed, the buffer plate 201 squeezes the second elastic element 204 on the inner wall of the groove 202. The second elastic element 204 absorbs the lateral frictional impact force through deformation, and at the same time, it uses the elastic rebound force to keep the buffer plate 201 in contact with the spring, thus maintaining the restraint.

[0057] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rear leaf spring assembly, comprising a rear leaf spring body (100), characterized in that, Also includes: The clamp (200) is fitted onto the rear leaf spring body (100); A connector (300) is installed on the rear leaf spring body (100). The clamp (200) is connected to the rear leaf spring body (100) through the connector (300). The connector (300) is provided with a movable cavity (302). The connector (303) is located in the movable cavity (302) and can move relative to the movable cavity (302); The second bolt (301) is installed on the clamp (200) and threadedly connected to the connector (303) to movably connect the clamp (200) to the rear leaf spring body (100).

2. The rear leaf spring assembly according to claim 1, characterized in that, The bottom of the rear leaf spring body (100) is provided with an installation groove, and the connector (300) is installed in the installation groove.

3. The rear leaf spring assembly according to claim 1, characterized in that, The bottom wall of the movable cavity (302) is provided with a through hole, and one end of the connector (303) extends out of the through hole.

4. The rear leaf spring assembly according to claim 1, characterized in that, The inner wall of the movable cavity (302) is equipped with a third elastic element (304), which is connected to the connector (303).

5. The rear leaf spring assembly according to claim 4, characterized in that, The third elastic element (304) is annular and is sleeved on the connector (303). The third elastic element (304) is located between the connector (303) and the inner wall of the movable cavity (302).

6. The rear leaf spring assembly according to claim 1, characterized in that, The clamp (200) includes: The first elastic element (203) is installed on the clamp (200) and is located between the bottom of the rear leaf spring body (100) and the clamp (200).

7. The rear leaf spring assembly according to claim 1, characterized in that, The clamp (200) also includes: A groove (202) is formed on the clamp (200); A buffer plate (201) is installed in a groove (202), and one side of the buffer plate (201) is in contact with the rear leaf spring body (100); The second elastic element (204) is installed between the buffer plate (201) and the inner wall of the groove (202).

8. The rear leaf spring assembly according to claim 1, characterized in that, The number of clamps (200) is at least two.

9. The rear leaf spring assembly according to claim 1, characterized in that, The rear leaf spring body (100) is composed of several springs, which are stacked sequentially from top to bottom, and the length of the springs increases from bottom to top.

10. The rear leaf spring assembly according to claim 9, characterized in that, The rear leaf spring body (100) includes: The first bolt (101) passes through several spring pieces sequentially from bottom to top; Nut (102) is threaded onto the first bolt (101).

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