Hydraulic limiting structure of shock absorber

Abstract

The utility model provides a hydraulic limiting structure of a shock absorber, which belongs to the field of single-cylinder shock absorber equipment and comprises a piston cylinder, a piston rod is slidably arranged in the piston cylinder, a guider is sleeved on the piston rod, and the guider is used for filling a gap between the outer surface of the piston rod and the inner surface of the piston cylinder and guiding the piston rod. The slot is located at the end, away from the guider, of the piston rod, and a through hole is formed in the side edge of the piston rod and communicates with the slot; the piston rod is provided with a through hole communicated with the open groove, the piston rod is provided with a through hole communicated with the open groove, the limiting rod is located at the end, away from the guider, of the piston cylinder, and when the piston rod is compressed to the end, away from the guider, of the piston cylinder, the limiting rod is inserted into the open groove. During compression, the limiting rod is inserted into the open groove, oil circulation is reduced, and resistance is increased, and during resetting, the through hole is blocked by the limiting cylinder, oil circulation is reduced, and resistance is increased.

Description

Technical Field

[0001] This utility model relates to the field of single-tube vibration damper equipment, specifically to a hydraulic limiting structure for vibration dampers. Background Technology

[0002] Currently, in the field of automotive shock absorbers, the hydraulic damping force of shock absorbers is mainly generated by the recovery valve and the compression valve. Its function is to attenuate the vibrations experienced by the vehicle during driving by generating damping force, so as to improve the stability and comfort of the vehicle.

[0003] However, existing automotive shock absorbers have a significant drawback: the lack of a limiting mechanism. For off-road vehicles that frequently travel in rough terrain, the vehicle experiences substantial bumps and jolting, causing the shock absorbers to frequently reach their maximum travel. When the shock absorber reaches its maximum travel, without effective limiting measures, it bears enormous impact forces. These large impacts can severely damage the internal structure and components of the shock absorber, leading to a rapid decline in performance and a significantly shortened lifespan.

[0004] Specifically, when a shock absorber is subjected to frequent and enormous impact forces, its internal key components such as valves, piston rods, and cylinders may experience fatigue wear, deformation, or even damage. This can affect the normal operation of the entire shock absorber, rendering it unable to effectively dampen vibrations and ultimately impacting the vehicle's driving performance and safety. Utility Model Content

[0005] In view of this, the present invention provides a hydraulic limiting structure for a shock absorber. A slot is opened on the piston rod, and the piston rod has a through hole connected to the slot. During compression, the limiting rod is inserted into the slot to reduce the flow of oil and increase resistance. During reset, the limiting cylinder blocks the through hole to reduce the flow of oil and increase resistance.

[0006] To solve the above-mentioned technical problems, this utility model provides a hydraulic limiting structure for a shock absorber, including a piston cylinder, a piston rod sliding inside the piston cylinder, and a piston at the end of the piston rod. The piston rod is used to drive the piston to move up and down inside the piston cylinder. The oil in the piston cylinder forms resistance to the piston's up and down movement to buffer vibration energy and reduce bumps. A guide is sleeved on the piston rod to guide the movement of the piston rod, ensuring that the piston rod maintains linear motion during reciprocating motion, reducing friction and wear between the piston rod and the cylinder, and improving the working efficiency and stability of the shock absorber.

[0007] The piston rod has a slot at its end, located at the end furthest from the guide. A through-hole is located on the side of the piston rod, near the guide. These through-holes are symmetrically arranged along the slot axis, and each through-hole communicates with the slot. When the piston rod is pressed down, the oil in the piston cylinder pushes up the valve plate on the piston, and the oil also flows from the slot to the through-hole. Simultaneous drainage from both locations reduces the resistance during piston rod compression. A limiting rod is installed at the end of the piston cylinder furthest from the guide. When the piston rod is compressed to this point, the limiting rod inserts into the slot. A small gap exists between the outer surface of the limiting rod and the inner surface of the slot, which abruptly reduces the oil discharge from the slot. Compared to simultaneous drainage from both locations, reducing the oil flow rate increases the compression resistance of the piston rod, preventing it from impacting the bottom of the piston cylinder during compression.

[0008] The further slot is cylindrical, and the limiting rod is also cylindrical. When the piston rod is pressed down, the limiting rod can be better inserted into the slot. The circular structure is the same on all sides, which can effectively prevent the limiting rod from not matching the shape of the slot due to the rotation of the slot or the limiting rod. This would prevent the limiting rod from being unable to be inserted into the slot, thus failing to limit the speed of the piston rod and potentially causing a hard collision between the limiting rod and the piston rod, which would damage the monotube shock absorber.

[0009] The end of the slot furthest from the guide is designed in a conical shape, as is the end of the limiting rod closest to the slot. When the limiting rod is inserted into the slot towards the guide, the conical end of the limiting rod will first contact the conical end of the slot. This conical surface mating design has a dual advantage: firstly, the conical structure of the slot guides the limiting rod, making its insertion smoother; secondly, the conical end of the limiting rod reduces the force-bearing area during initial contact, avoiding jamming due to initial contact point deviation, thus ensuring precise alignment and smooth assembly.

[0010] The guide has a limiting cylinder near the limiting rod. The limiting cylinder is cylindrical, and the limiting rod is cylindrical. The limiting cylinder is sleeved on the piston rod, and the limiting cylinder and piston rod are concentrically arranged with a gap between them. The limiting cylinder has an opening that communicates with the gap. When the piston rod resets, oil flows from the through hole into the slot and is discharged through the slot to the end of the piston away from the guide. At the same time, the oil is also discharged through the piston. When the through hole on the piston rod moves into the limiting cylinder, the gap formed between the inner surface of the limiting cylinder and the outer surface of the piston rod can block most of the oil from flowing from the through hole into the slot, slowing down the oil discharge speed and increasing the resistance when the piston rod resets. When the through hole is inside the limiting cylinder, the oil at the piston end near the guide can flow from the opening at a low speed through the gap formed between the outer surfaces of the piston rod and the through hole for discharge.

[0011] The beneficial effects of the above-mentioned technical solution of this utility model are as follows:

[0012] 1. Limiting rod and slotted fit: When the piston rod is compressed to the end away from the guide, the limiting rod inserts into the slot. Due to the small gap, the oil discharge can be suddenly reduced, the compression resistance can be increased, the piston rod can be prevented from hitting the bottom of the piston cylinder, and the shock absorber can be prevented from receiving a large impact force.

[0013] 2. The cylindrical structure of the slot and the limiting rod: The circular structure has the same shape on all sides, which can prevent the shape from being mismatched due to the rotation of the slot or the limiting rod, and avoid the limiting rod being unable to be inserted into the slot, the inability to limit speed, and damage to the shock absorber caused by hard collision.

[0014] 3. The conical end of the slot and the limiting rod: The conical surface can guide the insertion of the limiting rod, making the insertion smoother; at the same time, it reduces the initial contact area, avoids jamming, and ensures accurate alignment and smooth assembly.

[0015] 4. Limiting Cylinder: When the piston rod is reset and the through hole moves into the limiting cylinder, the gap between the limiting cylinder and the piston rod can block most of the oil from flowing from the through hole into the slot, slowing down the oil discharge speed, increasing the piston rod reset resistance, and preventing the shock absorber from receiving a large impact force. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of a hydraulic limiting structure for a shock absorber according to the present invention;

[0017] Figure 2 This is a schematic diagram of the left-side structure of this utility model.

[0018] Explanation of reference numerals in the attached drawings: 1. Piston cylinder; 2. Piston rod; 3. Guide; 4. Slot; 5. Through hole; 6. Limiting rod; 7. Limiting cylinder; 8. Opening; 9. Piston. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of this utility model. Figure 1-2 The technical solutions of the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0020] like Figure 1 , 2 As shown:

[0021] This embodiment provides a hydraulic limiting structure for a vibration damper. The vibration damper mainly includes a piston cylinder 1, within which a slidable piston rod 2 is installed. A piston 9 is mounted at the end of the piston rod 2. The piston rod 2 drives the piston 9 to move up and down within the piston cylinder 1. The oil in the piston cylinder 1 generates resistance as the piston 9 moves up and down, thereby buffering vibration energy and reducing bumps. A guide 3 is fitted onto the piston rod 2, which guides the movement of the piston rod 2, ensuring that the piston rod 2 maintains linear motion during reciprocating motion. This reduces friction and wear between the piston rod 2 and the cylinder body, thereby improving the working efficiency and stability of the vibration damper.

[0022] like Figure 1 , 2 As shown:

[0023] A slot 4 is provided at the end of the piston rod 2, located at the end of the piston rod 2 away from the guide 3. Simultaneously, a through hole 5 is located on the side of the piston rod 2, at the end of the piston 9 near the guide 3. The through holes 5 are symmetrically arranged around the axis of the slot 4, and each through hole 5 is connected to the slot 4. When the piston rod 2 is pressed down, the oil in the piston cylinder 1 pushes up the valve plate on the piston 9. At this time, the oil not only flows from the slot 4 to the through hole 5, but also simultaneously drains from both locations towards the end of the piston 9 near the guide 3. This simultaneous drainage from both locations reduces the resistance encountered by the piston rod 2 during compression. To prevent the piston rod 2 from impacting the bottom of the piston cylinder 1 during compression, a limiting rod 6 is installed at the end of the piston cylinder 1 away from the guide 3. When the piston rod 2 is compressed to the end away from the guide 3, the limiting rod 6 inserts into the slot 4. Because the gap between the outer surface of the limiting rod 6 and the inner surface of the slot 4 is small, this suddenly reduces the discharge of oil from the slot 4. Compared to the case where fluid is drained from two locations simultaneously, the reduced fluid flow rate increases the compression resistance of piston rod 2, thereby preventing impact.

[0024] like Figure 1 As shown:

[0025] Looking further, the slot 4 is designed in a cylindrical shape, and the limiting rod 6 is also a cylindrical structure. This design allows the limiting rod 6 to better insert into the slot 4 when the piston rod 2 is pressed down. Because all surfaces of the circular structure are identical, it effectively prevents the limiting rod 6 from failing to insert into the slot 4 due to a mismatch in shape between the limiting rod 6 and the slot 4 caused by rotation of the slot 4 or the limiting rod 6. If the limiting rod 6 cannot be inserted into the slot 4, it cannot limit the speed of the piston rod 2, and may even cause a hard collision between the limiting rod 6 and the piston rod 2, thereby damaging the monotube shock absorber.

[0026] like Figure 1 As shown:

[0027] The end of the slot 4 furthest from the guide 3 is designed to be conical, and the end of the limiting rod 6 closest to the slot 4 is also conical. When the limiting rod 6 is inserted into the slot 4 towards the guide 3, the conical end of the limiting rod 6 will first contact the conical end of the slot 4. This conical surface mating design has a dual advantage: on the one hand, the conical structure of the slot 4 can guide the limiting rod 6, making its insertion process smoother; on the other hand, the conical end of the limiting rod 6 can reduce the force-bearing area during the initial contact, avoiding jamming due to deviation at the initial contact point, thereby ensuring that the two can be accurately aligned and successfully assembled.

[0028] like Figure 1 , 2 As shown:

[0029] A limiting cylinder 7 is provided at the end of the guide 3 near the limiting rod 6. The limiting cylinder 7 is cylindrical and fits onto the piston rod 2, and is concentrically positioned with a gap between them. An opening 8 is formed on the limiting cylinder 7, which communicates with the gap. When the piston rod 2 resets, oil flows from the through hole 5 into the groove 4, and then discharges through the groove 4 to the end of the piston 9 furthest from the guide 3. Simultaneously, the oil also passes through the piston 9 for discharge. When the through hole 5 on the piston rod 2 moves into the limiting cylinder 7, the gap formed between the inner surface of the limiting cylinder 7 and the outer surface of the piston rod 2 blocks most of the oil from flowing from the through hole 5 into the groove 4, thus slowing down the oil discharge rate and increasing the resistance when the piston rod 2 resets. When the through hole 5 is located inside the limiting cylinder 7, the oil at the end of the piston 9 near the guide 3 can flow at a low speed through the gap formed between the outer surfaces of the piston rod 2 and the opening 8 to the through hole 5 for discharge.

[0030] Working principle: When piston rod 2 is compressed to the end of piston cylinder 1 (piston 9), the limiting rod 6 at the end of piston cylinder 1 away from guide 3 inserts into slot 4. Due to the small gap between them, oil discharge is reduced, compression resistance is increased, and impact on the cylinder bottom is prevented. Both slot 4 and limiting rod 6 are cylindrical, and their conical surfaces at both ends fit together to ensure smooth insertion and precise alignment of limiting rod 6. When piston rod 2 returns to its original position, oil flows into slot 4 from through hole 5 and is discharged through piston 9. When through hole 5 moves into limiting cylinder 7 of guide 3, the gap between limiting cylinder 7 and piston rod 2 blocks oil flow, slowing down the discharge speed and increasing return resistance. At this time, oil at the end of piston 9 near guide 3 is discharged to through hole 5 through opening 8 and gap of limiting cylinder 7 at a low flow rate.

[0031] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A hydraulic limiting structure for a shock absorber, comprising a piston cylinder (1), a piston connected to the end of a piston rod (2) sliding within the piston cylinder (1), and a guide (3) sleeved on the piston rod (2), the guide (3) being used to fill the gap between the outer surface of the piston rod (2) and the inner surface of the piston cylinder (1) and to guide the piston rod (2), characterized in that: Also includes; A slot (4) is located at the end of the piston rod (2) away from the guide (3). The piston rod (2) has a through hole (5) on its side. The through hole (5) is located at the end of the piston (9) close to the guide (3). The through hole (5) is connected to the slot (4). Limiting rod (6) is located at the end of piston cylinder (1) away from the guide (3). When piston rod (2) is compressed to the end away from the guide (3), limiting rod (6) is inserted into the slot (4). The guide (3) has a limiting cylinder (7) near the limiting rod (6). The limiting cylinder (7) is cylindrical and is sleeved on the piston rod (2). The limiting cylinder (7) and the piston rod (2) are concentrically arranged. There is a gap between the limiting cylinder (7) and the piston rod (2). The limiting cylinder (7) has an opening (8) that communicates with the gap.

2. The hydraulic limiting structure for a shock absorber as described in claim 1, characterized in that: The slot (4) has a cylindrical structure.

3. The hydraulic limiting structure for a shock absorber as described in claim 2, characterized in that: The slot (4) has a conical structure at one end near the limiting rod (6).

4. The hydraulic limiting structure for a shock absorber as described in claim 1, characterized in that: The limiting rod (6) has a cylindrical structure.

5. The hydraulic limiting structure for a shock absorber as described in claim 4, characterized in that: The limiting rod (6) has a conical structure at one end near the piston rod (2).

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