Damping-adjustable piston rod structure

Abstract

The utility model discloses a damping-adjustable piston rod structure which comprises a hollow piston rod, a damping adjusting module rotationally arranged at the top of the piston rod, an adjusting block in threaded connection with the damping adjusting module, a sliding valve assembly arranged in the piston rod in a sliding mode and an oil inlet sleeve arranged at the bottom of the piston rod in an inserted mode. A certain oil inlet space is formed in the piston rod, an oil inlet channel communicated with the oil inlet space is formed in the oil inlet sleeve, an oil outlet channel communicated with the oil inlet space is formed in the side wall of the piston rod, and the damping adjusting module rotates and drives the adjusting block to ascend or descend to force the sliding valve assembly to slide up and down in the piston rod. And the oil inlet space and the oil inlet channel are communicated or separated.

Description

Technical Field

[0001] The utility model relates to the technical field of shock absorbers, and particularly relates to a damping adjustable piston rod structure. Background Art

[0002] With the development of the automotive industry, people's requirements for the comfort of seat riding are getting higher and higher. Hydraulic shock absorption is a common shock absorption method in the automotive field. The output end and the body of the automotive hydraulic shock absorber are respectively installed on the vehicle body and the wheel. A shock absorber piston is arranged in the automotive shock absorber. When the vehicle vibrates up and down during driving, the piston reciprocates in the piston cylinder. When the piston reciprocates, the hydraulic oil on both sides of the piston will reciprocate through the flow holes on the piston in the direction opposite to the piston, thereby playing a shock absorption role.

[0003] In the automotive seat shock absorbers of existing automotive seats, the piston rod generally adopts a solid rod, which has a simple structure, low machining accuracy, strong versatility, and low cost for automotive shock absorbers. However, such a piston rod has a single function and does not have an adjustment function, and cannot independently adjust the piston rod to control the damping force of the shock absorber. Content of the Utility Model

[0004] In order to solve the technical problems in the background art, the utility model provides a damping adjustable piston rod structure.

[0005] The technical solution adopted by the utility model to solve its technical problems is as follows:

[0006] A damping adjustable piston rod structure includes a piston rod provided with a hollow interior, a damping adjustment module rotatably arranged at the top of the piston rod, an adjustment block screwed to the damping adjustment module, a spool assembly slidably arranged in the piston rod, and an oil inlet sleeve inserted at the bottom of the piston rod;

[0007] A certain oil inlet space is formed in the piston rod, an oil inlet passage communicating with the oil inlet space is formed in the oil inlet sleeve, an oil outlet passage communicating with the oil inlet space is formed on the side wall of the piston rod, and the damping adjustment module rotates to drive the adjustment block to rise or fall, forcing the spool assembly to slide up and down in the piston rod to connect or disconnect the oil inlet space and the oil inlet passage.

[0008] Preferably, the damping adjustment module includes an adjusting seat fixed thereon, and an adjusting screw rotatably arranged on the adjusting seat. A part of the adjusting screw is placed inside the piston rod and is threadedly connected to the adjusting block. Through the above improvement, when it is necessary to adjust the damping, the adjusting screw can be rotated to make the adjusting block slide up and down. When it is necessary to increase the damping, the adjusting screw can be rotated to make the adjusting block press down the spool assembly. As the spool assembly cuts off the oil inlet space and the oil inlet passage, the hydraulic oil in the lower cavity of the shock absorber body cannot enter the upper cavity of the valve body through the oil inlet passage, thereby increasing the damping force of the shock absorber. When it is necessary to reduce the damping force, the adjusting screw can be rotated to make the sliding block rise. When the spool assembly is released from the restriction of the sliding block, it will rise under the action of the hydraulic oil, thereby connecting the oil inlet passage and the oil inlet space. The hydraulic oil can enter the oil inlet space through the oil inlet passage and enter the upper cavity of the shock absorber body through the oil outlet passage, thereby reducing the damping force of the shock absorber.

[0009] Preferably, an installation groove is formed on the adjusting screw. An elastic element is arranged in the installation groove. The bottom of the elastic element abuts against a positioning steel ball, and a plurality of positioning grooves for the positioning steel ball to be placed are arranged at intervals on the adjusting seat. Through the above improvement, since one end of the elastic element abuts against the installation groove and the other end abuts against the positioning steel ball, the positioning steel ball always has a downward movement tendency. As the adjusting screw rotates, the steel ball will enter the corresponding positioning groove along with the adjusting screw, so that the adjusting screw is kept in the current position and the feel during the rotation of the adjusting screw is improved.

[0010] Preferably, a fixing groove is arranged on the outer periphery of the adjusting screw. A positioning snap ring is arranged on the fixing groove, and the positioning snap ring abuts against the bottom of the adjusting seat to limit the adjusting screw from detaching from the adjusting seat. Through the above improvement, by using the positioning snap ring to abut against the bottom of the adjusting seat, the adjusting screw can be rotatably clamped on the adjusting seat, avoiding the adjusting screw from detaching from the adjusting seat.

[0011] Preferably, the spool assembly includes a sliding rod and a sliding spool slidably arranged inside the piston rod. The sliding rod is arranged below the adjusting block, and the sliding spool is arranged below the sliding rod. The damping adjustment module rotates and drives the adjusting block to descend. The adjusting block presses the sliding rod to descend and forces the sliding rod to drive the sliding spool to descend. Through the above improvement, during the adjustment of the piston rod, as the adjusting block descends, first the adjusting block presses down the sliding rod, causing the sliding rod to move downward and drive the sliding spool to move towards the oil inlet passage, thereby increasing the damping of the shock absorber. When the adjusting block rises, the spool assembly lacks the restriction of the adjusting block, and the sliding spool will rise under the action of the hydraulic oil, so that the hydraulic oil can enter the oil inlet space through the oil inlet passage and be discharged from the oil outlet passage to reduce the damping of the shock absorber.

[0012] Preferably, a partition convex portion is formed at the bottom of the sliding spool valve. The partition convex portion trends to converge along the direction of being inserted into the oil inlet passage. An oil inlet gap is formed between the partition convex portion and the oil inlet passage, and the oil inlet gap becomes smaller as the partition convex portion descends. Through the above improvement, since the partition convex portion trends to converge along the direction of being inserted into the oil inlet passage, the oil inlet gap becomes smaller as the partition convex portion descends. The descending distance of the partition convex portion can be adjusted according to requirements to quantitatively adjust the damping force.

[0013] Preferably, a sealing groove is provided on the sliding spool valve. A sealing ring is provided on the sealing groove, and the sealing ring abuts against the piston rod. Through the above improvement, the sealing ring abuts against the inner space of the piston rod, thereby greatly improving the sealing performance and preventing the hydraulic oil from flowing through.

[0014] Preferably, a butting convex portion is formed on the sliding spool valve. The butting convex portion abuts against the oil inlet sleeve to partition the oil inlet space and the oil inlet passage. Through the above improvement, when the sliding spool valve descends to a certain position, the butting convex portion will abut against the top of the oil inlet sleeve, thereby partitioning the oil inlet space and the oil inlet passage, preventing the hydraulic oil from flowing into the oil inlet passage, and increasing the damping force of the shock absorber.

[0015] Preferably, a rotating groove for driving its rotation is provided at the top of the adjusting screw rod. Through the above improvement, the rotating groove can be used to drive the adjusting screw rod to rotate, improving the convenience of adjustment.

[0016] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0017] By providing the piston rod with a hollow structure, arranging a damping adjustment module at the top of the piston rod, providing an adjustment block screwed to the damping adjustment module inside the piston rod, slidably arranging a spool valve assembly inside the piston rod, and inserting an oil inlet sleeve at the bottom of the piston rod. Since the shock absorber body includes an inner cylinder and an outer cylinder, the piston rod is arranged inside the inner cylinder, and a piston is provided on the piston rod. The piston defines the inner cylinder into an upper chamber and a lower chamber. A certain oil inlet space is formed inside the piston rod, and an oil inlet passage communicating with the oil inlet space is formed inside the oil inlet sleeve. The oil inlet passage is inserted into the lower chamber, and an oil outlet passage communicating with the oil inlet space is formed on the side wall of the piston rod. The oil outlet passage is inserted into the upper chamber. Rotating the damping adjustment module can drive the adjustment block to rise or fall, forcing the spool valve assembly to slide up and down inside the piston rod to connect or partition the oil inlet space and the oil inlet passage. When the oil inlet passage is connected to the oil inlet space, the hydraulic oil can flow from the lower chamber into the upper chamber, thereby reducing the damping force of the shock absorber. When the damping adjustment module partitions the oil inlet passage and the oil inlet space, the hydraulic oil in the lower chamber cannot be discharged into the upper chamber through the oil inlet passage, thereby increasing the pressure in the lower chamber to improve the damping force of the entire shock absorber. Thus, the damping force of the shock absorber can be adjusted by using the piston rod, which not only increases the adjustment methods of the damping force of the shock absorber but also makes the function of the piston rod more diversified. Description of the Drawings

[0018] Figure 1 is a cross-sectional view of the overall structure of the present utility model;

[0019] Figure 2 is a cross-sectional view of the damping adjustment module and the adjustment block of the present utility model;

[0020] Figure 3 is a schematic structural view of the sliding valve core and the oil inlet sleeve of the present utility model;

[0021] In the figures: 1, piston rod; 2, damping adjustment module; 3, adjustment block; 4, spool assembly; 5, oil inlet sleeve; 6, oil inlet space; 7, oil inlet passage; 8, oil outlet passage; 1.1, adjustment seat; 1.2, adjustment screw; 1.3, installation groove; 1.4, elastic element; 1.5, positioning steel ball; 1.6, positioning groove; 1.7, fixing groove; 1.8, positioning snap ring; 1.9, rotating groove; 2.1, sliding rod; 2.2, sliding valve core; 2.3, partition convex part; 2.4, oil inlet gap; 2.5, sealing groove; 2.6, sealing ring; 2.7, abutting convex part; Detailed Description of the Invention

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0023] It should be understood that although terms such as upper, middle, lower, top, one end, etc. appear in this text to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish elements from each other for easy understanding, rather than for defining any directional or sequential limitations.

[0024] As Figures 1-3 shown, a damping adjustable piston rod 1 structure includes a hollow piston rod 1, a damping adjustment module 2 rotatably provided at the top of the piston rod 1, an adjustment block 3 screwed to the damping adjustment module 2, a spool assembly 4 slidably provided in the piston rod 1, and an oil inlet sleeve 5 inserted at the bottom of the piston rod 1;

[0025] Specifically, a certain oil inlet space 6 is formed inside the piston rod 1, an oil inlet passage 7 communicating with the oil inlet space 6 is formed inside the oil inlet sleeve 5, an oil outlet passage 8 communicating with the oil inlet space 6 is formed on the side wall of the piston rod 1, and the damping adjustment module 2 rotates to drive the adjustment block 3 to rise or fall, forcing the spool assembly 4 to slide up and down inside the piston rod 1 to connect or disconnect the oil inlet space 6 and the oil inlet passage 7.

[0026] By making the piston rod 1 hollow, a damping adjustment module 2 is provided at the top of the piston rod 1, an adjustment block 3 screwed to the damping adjustment module 2 is arranged inside the piston rod 1, a spool valve assembly 4 is slidably arranged inside the piston rod 1, and an oil inlet sleeve 5 is inserted at the bottom of the piston rod 1.

[0027] Since the shock absorber body includes an inner cylinder and an outer cylinder, the piston rod 1 is arranged in the inner cylinder, and a piston is arranged on the piston rod 1. The piston defines the inner cylinder into an upper cavity and a lower cavity, and a certain oil inlet space 6 is formed inside the piston rod 1. The pressure in the lower cavity determines the damping force of the entire shock absorber. An oil inlet passage 7 communicating with the oil inlet space 6 is formed inside the oil inlet sleeve 5. The oil inlet passage 7 is placed in the lower cavity, and an oil outlet passage 8 communicating with the oil inlet space 6 is formed on the side wall of the piston rod 1. The oil outlet passage 8 is placed in the upper cavity. Rotating the damping adjustment module 2 can drive the adjustment block 3 to rise or fall, forcing the spool valve assembly 4 to slide up and down inside the piston rod 1 to connect or cut off the oil inlet space 6 and the oil inlet passage 7. When the oil inlet passage 7 is connected to the oil inlet space 6, hydraulic oil can flow from the lower cavity into the upper cavity, thereby reducing the damping force of the shock absorber. When the damping adjustment module 2 cuts off the oil inlet passage 7 from the oil inlet space 6, the hydraulic oil in the lower cavity cannot be discharged into the upper cavity through the oil inlet passage 7, thereby increasing the pressure in the lower cavity to improve the damping force of the entire shock absorber, so as to realize adjusting the damping force of the shock absorber by using the piston rod 1, which not only increases the adjustment methods of the shock absorber damping force, but also makes the function of the piston rod 1 more diversified.

[0028] As Figures 1 to 3 shown, for a further explanation of the implementation manner of the damping adjustment module 2 in this embodiment, wherein, the damping adjustment module 2 includes a regulating seat 1.1 fixedly arranged, and a regulating screw 1.2 rotatably arranged on the regulating seat 1.1. The regulating screw 1.2 is partially placed inside the piston rod 1 and is threadedly connected to the adjustment block 3.

[0029] During use, when it is necessary to adjust the damping size, the regulating screw 1.2 can be rotated to make the adjustment block 3 slide up and down. When it is necessary to increase the damping, the regulating screw 1.2 can be rotated to make the adjustment block 3 press down the spool valve assembly 4. As the spool valve assembly 4 cuts off the oil inlet space 6 and the oil inlet passage 7, the hydraulic oil in the lower cavity of the shock absorber body cannot enter the upper cavity of the valve body through the oil inlet passage 7, thereby increasing the damping force of the shock absorber. When it is necessary to reduce the damping force, the regulating screw 1.2 can be rotated to make the sliding block rise. When the spool valve assembly 4 is released from the restriction of the sliding block, it will rise under the action of hydraulic oil, thereby connecting the oil inlet passage 7 and the oil inlet space 6. The hydraulic oil can enter the oil inlet space 6 through the oil inlet passage 7 and enter the upper cavity of the shock absorber body through the oil outlet passage 8, thereby reducing the damping force of the shock absorber.

[0030] Specifically, an installation groove 1.3 is formed on the adjusting screw rod 1.2. An elastic element 1.4 is arranged in the installation groove 1.3. A positioning steel ball 1.5 abuts against the bottom of the elastic element 1.4. A plurality of positioning grooves 1.6 for the positioning steel ball 1.5 to be placed are arranged on the adjusting seat 1.1 at intervals. Since one end of the elastic element 1.4 abuts against the installation groove 1.3 and the other end abuts against the positioning steel ball 1.5, the positioning steel ball 1.5 always has a downward movement tendency. As the adjusting screw rod 1.2 rotates, the steel ball will enter the corresponding positioning groove 1.6 along with the adjusting screw rod 1.2, so that the adjusting screw rod 1.2 is kept in the current position and the feel during the rotation of the adjusting screw rod 1.2 is improved.

[0031] In addition, a fixing groove 1.7 is arranged on the outer periphery of the adjusting screw rod 1.2. A positioning snap ring 1.8 is arranged on the fixing groove 1.7. The positioning snap ring 1.8 abuts against the bottom of the adjusting seat 1.1 to limit the adjusting screw rod 1.2 from detaching from the adjusting seat 1.1. By using the positioning snap ring 1.8 to abut against the bottom of the adjusting seat 1.1, the adjusting screw rod 1.2 can be rotatably clamped on the adjusting seat 1.1, avoiding the adjusting screw rod 1.2 from detaching from the adjusting seat 1.1.

[0032] Preferably, a rotating groove 1.9 for driving its rotation is arranged at the top of the adjusting screw rod 1.2. The rotating groove 1.9 can be used to drive the adjusting screw rod 1.2 to rotate, improving the convenience of adjustment.

[0033] As Figures 1 to 3 shown, for a further explanation of the implementation manner of the spool assembly 4 in this embodiment, wherein the spool assembly 4 includes a sliding rod 2.1 and a sliding spool 2.2 that are slidably arranged in the piston rod 1. The sliding rod 2.1 is arranged below the adjusting block 3, and the sliding spool 2.2 is arranged below the sliding rod 2.1. The damping adjustment module 2 rotates and drives the adjusting block 3 to descend. The adjusting block 3 squeezes the sliding rod to descend, and forces the sliding rod to drive the sliding spool 2.2 to descend.

[0034] During the adjustment of the piston rod 1, as the adjusting block 3 descends, first, the adjusting block 3 squeezes the sliding rod 2.1 downward, causing the sliding rod 2.1 to move downward and drive the sliding spool 2.2 to move toward the oil inlet passage 7, thereby increasing the damping of the shock absorber. When the adjusting block 3 ascends, the spool assembly 4 lacks the restriction of the adjusting block 3, and the sliding spool 2.2 will rise under the action of the hydraulic oil, so that the hydraulic oil can enter the oil inlet space 6 through the oil inlet passage 7 and be discharged from the oil outlet passage 8 to reduce the damping of the shock absorber.

[0035] Specifically, a partition convex part 2.3 is formed at the bottom of the sliding valve core 2.2. The partition convex part 2.3 has a converging trend along the direction of being inserted into the oil inlet passage 7, and an oil inlet gap 2.4 is formed between the partition convex part 2.3 and the oil inlet passage 7. Since the partition convex part 2.3 has a converging trend along the direction of being inserted into the oil inlet passage 7, the oil inlet gap 2.4 becomes smaller as the partition convex part 2.3 descends. The descending distance of the partition convex part 2.3 can be adjusted according to requirements to quantitatively adjust the damping force.

[0036] Preferably, a sealing groove 2.5 is provided on the sliding valve core 2.2. A sealing ring 2.6 is provided in the sealing groove 2.5, and the sealing ring 2.6 abuts against the piston rod 1. The sealing ring 2.6 abuts against the inner space of the piston rod 1, thereby greatly improving the sealing performance and preventing the hydraulic oil from flowing through.

[0037] In addition, a contact convex part 2.7 is formed on the sliding valve core 2.2. When the sliding valve core 2.2 descends to a certain position, the contact convex part 2.7 will contact the top of the oil inlet sleeve 5, thereby separating the oil inlet space 6 and the oil inlet passage 7 and preventing the hydraulic oil from flowing into the oil inlet passage 7, thereby increasing the damping force of the shock absorber.

[0038] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions according to needs, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. A damping adjustable piston rod structure, characterized in that, It includes a hollow piston rod (1), a damping adjustment module (2) rotatably provided at the top of the piston rod (1), an adjustment block (3) screwed to the damping adjustment module (2), a spool valve assembly (4) slidably provided in the piston rod (1), and an oil inlet sleeve (5) inserted at the bottom of the piston rod (1); A certain oil inlet space (6) is formed in the piston rod (1), an oil inlet passage (7) communicating with the oil inlet space (6) is formed in the oil inlet sleeve (5), an oil outlet passage (8) communicating with the oil inlet space (6) is formed on the side wall of the piston rod (1), and the damping adjustment module (2) rotates to drive the adjustment block (3) to rise or fall, forcing the spool valve assembly (4) to slide up and down in the piston rod (1) to connect or cut off the oil inlet space (6) and the oil inlet passage (7).

2. The damping adjustable piston rod structure according to claim 1, characterized in that, The damping adjustment module (2) includes an adjustment seat (1.1) fixed thereon, and an adjustment screw rod (1.2) rotatably provided on the adjustment seat (1.1), and a part of the adjustment screw rod (1.2) is placed in the piston rod (1) and is threadedly connected with the adjustment block (3).

3. A damping adjustable piston rod structure according to claim 2, characterized in that, An installation groove (1.3) is formed on the adjustment screw rod (1.2), an elastic element (1.4) is arranged in the installation groove (1.3), a positioning steel ball (1.5) abuts against the bottom of the elastic element (1.4), and a plurality of positioning grooves (1.6) for the positioning steel ball (1.5) to be placed are arranged at intervals on the adjustment seat (1.1).

4. A damping adjustable piston rod structure according to claim 2, characterized in that, A fixing groove (1.7) is arranged on the outer periphery of the adjustment screw rod (1.2), a positioning snap ring (1.8) is arranged on the fixing groove (1.7), and the positioning snap ring (1.8) abuts against the bottom of the adjustment seat (1.1) to limit the adjustment screw rod (1.2) from detaching from the adjustment seat (1.1).

5. A damping adjustable piston rod structure according to claim 1, characterized in that, The spool valve assembly (4) includes a sliding rod (2.1) and a sliding spool (2.2) slidably arranged in the piston rod (1), the sliding rod (2.1) is arranged below the adjustment block (3), and the sliding spool (2.2) is arranged below the sliding rod (2.1). When the damping adjustment module (2) rotates to drive the adjustment block (3) to descend, the adjustment block (3) squeezes the sliding rod (2.1) to descend, and forces the sliding rod (2.1) to drive the sliding spool (2.2) to descend.

6. A damping adjustable piston rod structure according to claim 5, characterized in that, A partition convex portion (2.3) is formed at the bottom of the sliding spool (2.2), the partition convex portion (2.3) has a converging trend along the direction of being inserted into the oil inlet passage (7), and an oil inlet gap (2.4) is formed between the partition convex portion (2.3) and the oil inlet passage (7), and the oil inlet gap (2.4) becomes smaller as the partition convex portion (2.3) descends.

7. A damping adjustable piston rod structure according to claim 5, characterized in that, A sealing groove (2.5) is arranged on the sliding spool (2.2), a sealing ring (2.6) is arranged on the sealing groove (2.5), and the sealing ring (2.6) abuts against the piston rod (1).

8. A damping adjustable piston rod structure according to claim 5, characterized in that, An abutting convex portion (2.7) is formed on the sliding spool (2.2), and the abutting convex portion (2.7) abuts against the oil inlet sleeve (5) to cut off the oil inlet space (6) and the oil inlet passage (7).

9. A damping adjustable piston rod structure according to claim 2, characterized in that, A rotating groove (1.9) for driving its rotation is arranged at the top of the adjustment screw rod (1.2).

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