Single-cylinder shock absorber utilizing buffer block to replace gas pressure structure

Abstract

The utility model discloses a single-cylinder shock absorber utilizing a buffer block to replace a gas pressure structure, which comprises an inner foaming buffer block, a floating piston, a liquid storage cylinder, a piston valve assembly and a guider component, the inner foaming buffer block is arranged at the bottom of the liquid storage cylinder, the structure is utilized to replace gas, and compared with the traditional gas pressure structure, the structure is simple, the structure is simple, and the operation is convenient. An inflation structure does not need to be arranged on the bottom cover, production procedures are reduced, production cost is reduced, and the problem of gas leakage caused by the sealing performance of an inflation inlet can be avoided; the upper end of the inner foaming buffer block is matched with the lower end of the floating piston to form a limiting structure, the upper end of the inner foaming buffer block and the lower end of the floating piston are mutually restrained, the floating piston is not prone to deflection in the working process, and the effect of preventing the floating piston from sliding to cause barrel wall abrasion is achieved. In addition, the inner foaming buffer block can be fixed through the floating piston and the limiting structure on the bottom cover, it is guaranteed that the buffer block does not shake at will, and the reliability is further guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of shock absorbers, in particular to a single-tube shock absorber which utilizes a buffer block to replace a gas pressure structure. Background Art

[0002] As an important part of the car, the shock absorber plays a key role in ensuring the safety and comfort of the car. It is installed between the car and the chassis. As a damping element, it can accelerate the attenuation of the body vibration, thereby improving the driving comfort of the car. Especially when dealing with complex road conditions, the performance of the shock absorber directly affects the driving stability and ride comfort of the car.

[0003] With the continuous innovation of automobile technology and the improvement of consumers' requirements for vehicle comfort, the shock absorber industry is also constantly innovating technology and upgrading products. The cylinder of the monotube pneumatic shock absorber is equipped with a floating piston, the upper side of the floating piston is filled with shock absorber oil, and the lower side is filled with gas to form a gas pressure structure (usually nitrogen). Because of its relatively simple structure, it is widely used.

[0004] However, the existing monotube pneumatic shock absorber still has the following shortcomings:

[0005] 1) The traditional single-tube pneumatic shock absorber needs to be equipped with an inflation port on the bottom cover. The sealing performance of the inflation port directly affects the stability of the high-pressure gas inside the shock absorber. If the seal is not tight, it will cause gas leakage, which will affect the damping effect and service life of the shock absorber.

[0006] 2) The sealing ring has no centering function. Due to the gap between the floating piston and the cylinder, the floating piston will deflect during movement, causing the floating piston to grind the cylinder wall during movement. Over time, a pit will be worn on the cylinder wall, and the sealing effect of the shock absorber will deteriorate, causing the shock absorber oil and high-pressure nitrogen to cross-contaminate each other, resulting in failure of the shock absorber. Summary of the invention

[0007] In view of the above-mentioned problems existing in the prior art, the utility model provides a single-tube shock absorber which utilizes a buffer block instead of a gas pressure structure. An internal foaming buffer block structure can be utilized to replace the gas, and there is no need to set an inflation structure on the bottom cover, thereby reducing the production process, reducing the production cost, and avoiding the problem of gas leakage due to the sealing of the inflation port. In addition, in the utility model, the internal foaming buffer block and the floating piston cooperate to form a limiting structure, and the two constrain each other, so that the floating piston is not easy to deflect during operation, which has the function of preventing the floating piston from sliding and causing wear on the tube wall, thereby improving the reliability of the shock absorber.

[0008] The technical solution of the utility model is as follows:

[0009] A single-tube shock absorber that uses a buffer block instead of a gas pressure structure includes a liquid storage cylinder, a piston valve assembly, and a guide assembly, wherein the piston valve assembly includes a piston rod and a piston valve arranged at the lower end of the piston rod, and the upper end of the piston rod extends from the top of the liquid storage cylinder; the lower end of the liquid storage cylinder is sealed by a bottom cover; a floating piston is provided in the liquid storage cylinder, and the floating piston divides the space in the liquid storage cylinder into a damping chamber and a buffer chamber, wherein the damping chamber is filled with shock absorber oil; it is characterized in that: an inner foaming buffer block is provided in the buffer chamber; the upper end of the inner foaming buffer block cooperates with the lower end of the floating piston to form a limiting structure, and the lower end of the inner foaming buffer block cooperates with the bottom cover to form a limiting structure; the outer peripheral surface of the inner foaming buffer block is corrugated, and has a group of wave peaks thereon, and the wave peaks are in contact with the inner wall of the liquid storage cylinder; the inner foaming buffer block is provided with through holes distributed along the axial direction.

[0010] Compared with the prior art, the utility model sets the internal foaming buffer block at the bottom of the liquid storage cylinder to replace the gas. Compared with the traditional gas pressure structure, the utility model does not need to set the inflation structure, which reduces the production process and reduces the production cost. It can also avoid the problem of gas leakage due to the sealing of the inflation port, and it is more convenient to assemble. The upper end of the internal foaming buffer block cooperates with the lower end of the floating piston to form a limiting structure. The two constrain each other, so that the floating piston is not easy to deflect during the operation, which has the effect of preventing the floating piston from sliding and causing wear on the cylinder wall. In addition, the utility model can fix the internal foaming buffer block through the limiting structure on the floating piston and the bottom cover to ensure that the buffer block does not shake at will, further ensuring reliability.

[0011] Furthermore, a first limiting groove is provided at the lower end of the floating piston, and the inner foaming buffer block cooperates with the first limiting groove to form a limiting structure. This structure is more conducive to the installation and placement of the buffer block, fixes the buffer block to the bottom of the liquid storage cylinder assembly, and is easy to implement.

[0012] Furthermore, the cross section of the bottom cover is U-shaped, so that a second limiting groove is formed on the inner side of the bottom cover, and the lower end of the inner foam buffer block cooperates with the second limiting groove to form a limiting structure. This structure is also easy to implement.

[0013] Furthermore, a sealing ring installation groove is provided on the outer peripheral surface of the floating piston, a sealing ring is provided in the sealing ring installation groove, and the sealing ring cooperates with the liquid storage cylinder to form a seal. By installing the sealing ring, the damping chamber and the buffer chamber can be sealed and separated to avoid oil and gas mixing and ensure the stability of the damping force.

[0014] Furthermore, a guide belt installation groove is provided on the outer circumferential surface of the floating piston, and a guide belt is provided in the guide belt installation groove. Furthermore, the guide belt is in a strip shape and is wound in the guide belt installation groove. Furthermore, square notches that cooperate with each other are provided at both ends of the guide belt. The addition of the guide belt can maintain the seal between the floating piston and the inner wall of the liquid storage cylinder. When the floating piston moves up and down in the liquid storage cylinder, its sliding surface is mainly borne by the guide belt, thereby preventing the floating piston from directly contacting the inner wall of the liquid storage cylinder, further reducing the possibility of the floating piston causing damage to the cylinder wall. This supporting effect helps to reduce friction resistance and ensure smooth movement of the piston. The square notch enables the guide belt to protect the entire outer circumferential surface of the floating piston and provide better support.

[0015] Furthermore, the guide belt may be arranged above the sealing ring.

[0016] Furthermore, a clearance groove is provided at the upper end of the floating piston, which can extend the movement stroke of the piston rod, which is conducive to miniaturization of the shock absorber, and can also reduce the manufacturing material of the floating piston, making the floating piston lighter.

[0017] Furthermore, the axis of the through hole is arranged to coincide with the axis of the inner foam buffer block. The through hole is arranged at the center of the inner foam buffer block, so that the force is more uniform when the inner foam buffer block is compressed, and the inner foam buffer block will not be skewed, and it can also be better restored. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a monotube shock absorber of the utility model which utilizes a buffer block to replace a gas pressure structure;

[0019] Figure 2 It is a structural schematic diagram of the guide belt used in the utility model.

[0020] Markings in the accompanying drawings: 1-internal foaming buffer block; 1.1-peak; 1.2-through hole; 2-floating piston; 2.1-first limiting groove; 2.2-sealing ring mounting groove; 2.3-guide belt mounting groove; 2.4-yield groove; 3-liquid storage cylinder; 4-piston valve assembly; 4.1-piston rod; 4.2-piston valve; 5-guide assembly; 6-bottom cover; 6.1-second limiting groove; 7-sealing ring; 8-guide belt; 8.1-square notch. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments, but they are not used as the basis of the utility model.

[0022] Example (see Figure 1-2 ):

[0023] The single-tube shock absorber using a buffer block instead of a gas pressure structure comprises a liquid reservoir 3, a piston valve assembly 4, and a guide assembly 5. The piston valve assembly 4 comprises a piston rod 4.1 and a piston valve 4.2 arranged at the lower end of the piston rod 4.1. The upper end of the piston rod 4.1 extends from the top of the liquid reservoir 3; the lower end of the liquid reservoir 3 is sealed by a bottom cover 6; a floating piston 2 is arranged in the liquid reservoir 3, and the floating piston 2 divides the space in the liquid reservoir 3 into a damping chamber and a buffer chamber, wherein the damping chamber is filled with shock absorber oil; an internal foaming buffer block 1 is arranged in the buffer chamber; the lower end of the floating piston 2 is provided with There is a first limiting groove 2.1, and the inner foaming buffer block 1 cooperates with the first limiting groove 2.1 to form a limiting structure. The cross-section of the bottom cover 6 is U-shaped, so that a second limiting groove 6.1 is formed on the inner side of the bottom cover 6, and the lower end of the inner foaming buffer block 1 cooperates with the second limiting groove 6.1 to form a limiting structure; the outer peripheral surface of the inner foaming buffer block 1 is corrugated, and there is a group of crests 1.1 thereon (as shown in the figure, there are 3 crests 1.1 in the embodiment), and the crests 1.1 are in contact with the inner wall of the liquid storage cylinder 3; the inner foaming buffer block 1 is provided with through holes 1.2 distributed along the axial direction. The through holes 1.2 and the troughs in the corrugated structure provide space for the compression and deformation of the inner foaming buffer block 1, and the crests 1.1 in the corrugated structure restrict the inner foaming buffer block 1 in the liquid storage cylinder 3 to avoid bending.

[0024] The outer peripheral surface of the floating piston 2 is provided with a sealing ring installation groove 2.2, in which a sealing ring 7 is provided, and the sealing ring 7 cooperates with the liquid storage cylinder 3 to form a seal. By installing the sealing ring 7, the damping chamber and the buffer chamber can be sealed and separated to avoid oil and gas mixing and ensure the stability of the damping force.

[0025] The outer circumference of the floating piston 2 is provided with a guide belt installation groove 2.3, and a guide belt 8 is provided in the guide belt installation groove 2.3; the guide belt 8 is in a strip shape and is wound in the guide belt installation groove 2.3; the two ends of the guide belt 8 are provided with mutually matching square notches 8.1; the guide belt 8 is arranged above the sealing ring 7. The addition of the guide belt 8 can maintain the seal between the floating piston 2 and the inner wall of the liquid storage cylinder 3. When the floating piston 2 moves up and down in the liquid storage cylinder 3, its sliding surface is mainly supported by the guide belt, thereby preventing the floating piston 2 from directly contacting the inner wall of the liquid storage cylinder 3, further reducing the possibility of the floating piston 2 causing damage to the cylinder wall. This supporting effect helps to reduce friction resistance and ensure the smooth movement of the floating piston 2. The square notch 8.1 enables the guide belt 8 to protect the entire outer circumference of the floating piston 2 and provide better support.

[0026] The upper end of the floating piston 2 is provided with a clearance groove 2.4. The clearance groove 2.4 can extend the movement stroke of the piston rod 4.1, so that the shock absorber can obtain greater damping force during the movement, with better shock absorption performance, which is conducive to the miniaturization of the shock absorber, and can also reduce the manufacturing material of the floating piston 2, making the floating piston 2 lighter.

[0027] The axis of the through hole 1.2 is arranged to coincide with the axis of the inner foam buffer block 1. The through hole 1.2 is arranged at the center of the inner foam buffer block 1, so that the force on the inner foam buffer block 1 is more uniform when it is compressed, and the inner foam buffer block 1 will not be skewed, and it can be better restored, which is more conducive to implementation.

[0028] During the compression process of the shock absorber of the utility model, the piston rod 4.1 is pressed down, and the oil pushes the floating piston 2 to compress the inner foam buffer block 1 downward, so that the inner foam buffer block 1 shrinks and deforms downward. During the recovery process, the piston rod 4.1 moves upward, and the rebound force of the inner foam buffer block 1 pushes the floating piston 2 to reset.

[0029] The above general description of the utility model involved in this application and the description of its specific implementation method should not be understood as limiting the technical solution of the utility model. Based on the disclosure of this application, those skilled in the art can add, reduce or combine the disclosed technical features in the above general description or / and the specific implementation method (including examples) without violating the constituent elements of the utility model involved, to form other technical solutions within the scope of protection of this application.

Claims

1. A single-tube shock absorber using a buffer block instead of a gas pressure structure, comprising a liquid storage cylinder (3), a piston valve assembly (4), and a guide assembly (5), wherein the piston valve assembly (4) comprises a piston rod (4.1) and a piston valve (4.2) arranged at the lower end of the piston rod (4.1), wherein the upper end of the piston rod (4.1) extends from the top of the liquid storage cylinder (3); the lower end of the liquid storage cylinder (3) is sealed by a bottom cover (6); a floating piston (2) is arranged in the liquid storage cylinder (3), and the floating piston (2) divides the space in the liquid storage cylinder (3) into a damping chamber and a buffer chamber, wherein: The damping chamber is filled with shock absorber oil; the characteristics are as follows: an internal foaming buffer block (1) is arranged in the buffer chamber; the upper end of the internal foaming buffer block (1) cooperates with the lower end of the floating piston (2) to form a limiting structure, and the lower end of the internal foaming buffer block (1) cooperates with the bottom cover (6) to form a limiting structure; the outer peripheral surface of the internal foaming buffer block (1) is corrugated, and has a group of wave peaks (1.1) thereon, and the wave peaks (1.1) are in contact with the inner wall of the liquid storage cylinder (3); the internal foaming buffer block (1) is provided with through holes (1.2) distributed along the axial direction.

2. The monotube shock absorber using a buffer block instead of a gas pressure structure according to claim 1, characterized in that: A first limiting groove (2.1) is provided at the lower end of the floating piston (2), and the inner foaming buffer block (1) cooperates with the first limiting groove (2.1) to form a limiting structure.

3. The monotube shock absorber using a buffer block instead of a gas pressure structure according to claim 1, characterized in that: The cross section of the bottom cover (6) is U-shaped, so that a second limiting groove (6.1) is formed on the inner side of the bottom cover (6), and the lower end of the inner foaming buffer block (1) cooperates with the second limiting groove (6.1) to form a limiting structure.

4. The monotube shock absorber using a buffer block instead of a gas pressure structure according to claim 1, characterized in that: A sealing ring installation groove (2.2) is provided on the outer peripheral surface of the floating piston (2), a sealing ring (7) is provided in the sealing ring installation groove (2.2), and the sealing ring (7) cooperates with the liquid storage cylinder (3) to form a seal.

5. The monotube shock absorber using a buffer block instead of a gas pressure structure according to claim 4 is characterized in that: A guide band installation groove (2.3) is provided on the outer peripheral surface of the floating piston (2), and a guide band (8) is provided in the guide band installation groove (2.3).

6. The monotube shock absorber using a buffer block instead of a gas pressure structure according to claim 5, characterized in that: The guide belt (8) is in a strip shape and is wound in the guide belt installation groove (2.3).

7. The monotube shock absorber using a buffer block instead of a gas pressure structure according to claim 6, characterized in that: Mutually matching square notches (8.1) are provided at both ends of the guide belt (8).

8. The monotube shock absorber using a buffer block instead of a gas pressure structure according to claim 5, characterized in that: The guide belt (8) is arranged above the sealing ring (7).

9. The monotube shock absorber using a buffer block instead of a gas pressure structure according to claim 1, characterized in that: The upper end of the floating piston (2) is provided with a clearance groove (2.4).

10. The monotube shock absorber using a buffer block instead of a gas pressure structure according to claim 1, characterized in that: The axis of the through hole (1.2) is arranged to coincide with the axis of the inner foaming buffer block (1).

Images