A shock absorber with a damping function and an automatic body level adjustment system

Abstract

The utility model discloses a shock absorber with damping function and automatic horizontal adjusting system of car body, including outer tube, inner tube, sealing sleeve, connecting rod, pump cylinder, pump rod, air bag, sealing sleeve sets up in the outer tube, and the both ends of outer tube are equipped with end cover and oil seal seat respectively, and the both ends of sealing sleeve are installed with bottom valve subassembly and guider respectively, and the outer periphery fixed connection of inner tube has upper seat and lower seat, and the both ends of air bag are connected with upper seat and lower seat respectively, and connecting rod penetrates oil seal seat, guider and extends into sealing sleeve in proper order, and the inner end of connecting rod is installed with piston, and pump cylinder sets up in connecting rod, and one end of pump rod is connected with bottom valve subassembly, and the other end of pump rod extends into pump cylinder, and first check valve and second check valve are equipped on pump cylinder and pump rod respectively, and the outer periphery of pump rod is installed with height sensor. The utility model discloses can better adapt to the demand of vehicle dynamic change, and the sitting comfort and car body stability of vehicle are improved significantly, and production cost and maintenance difficulty are reduced simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of automotive suspension system technology, and more specifically to an improved shock absorber with damping function and automatic vehicle leveling system. Background Technology

[0002] Existing automatic vehicle leveling systems, in addition to the basic structure of ordinary twin-cylinder shock absorbers, also consist of a pump cylinder, pump rod, and airbag. Their main function is to absorb the vibration energy generated during vehicle operation through damping force, while simultaneously controlling the vehicle height through airbag pressure regulation. However, existing technology has the following drawbacks and shortcomings: 1. Difficult parts processing: The mainstream technical solutions on the market usually control the pump cylinder and pump rod to have a sufficiently small clearance fit so that the oil is pumped into the high pressure chamber to squeeze the air bag to provide lifting force. Therefore, the pump cylinder and pump rod have high precision requirements and are difficult to process.

[0003] 2. Low boosting efficiency: The current mainstream technology solutions have too small a volume of oil replenishment per piston movement due to the gap between the pump cylinder and the pump rod, resulting in low boosting efficiency and an inability to quickly adapt to the dynamic changes in vehicle demand.

[0004] 3. The inflation process is complex and unstable: The existing inflation process is not precise enough in terms of air pressure control and is complex. Air pressure fluctuations are prone to occur during inflation, which affects the performance stability and service life of the shock absorber.

[0005] 4. Insufficient sealing performance of the airbag upper seat: Under high air pressure environment, the existing airbag upper seat sealing structure is prone to leakage or deformation, which leads to the failure of the shock absorber's air pressure regulation function, thereby affecting the accuracy and reliability of vehicle level adjustment.

[0006] Furthermore, the aforementioned problems will also lead to the following difficulties: 1. The cost of processing parts is too high.

[0007] 2. In complex road conditions, the vehicle's body height adjustment is not timely enough, affecting driving comfort and safety.

[0008] 3. The instability of the inflation process increases production costs and maintenance difficulty, limiting the widespread application of shock absorbers.

[0009] 4. Insufficient sealing performance may cause the shock absorber to malfunction during long-term use, increasing the user's maintenance frequency and operating costs.

[0010] Therefore, it is necessary to improve the existing vibration dampers. Utility Model Content

[0011] The purpose of this invention is to provide a shock absorber with damping function and automatic vehicle leveling system. This invention can better adapt to the dynamic changes of the vehicle, significantly improve the ride comfort and vehicle stability, and at the same time reduce production costs and maintenance difficulty, and has broad market application prospects.

[0012] To achieve the above objectives, this utility model provides the following technical solution: A shock absorber with damping function and automatic vehicle body leveling system, comprising an outer cylinder, an inner cylinder, a sealing sleeve, a connecting rod, a pump cylinder, a pump rod, and an airbag. The sealing sleeve is coaxially disposed inside the outer cylinder. One end of the outer cylinder is fixedly connected to an end cap, and the other end of the outer cylinder is sealed with an oil seal seat. A bottom valve sub-assembly is installed at one end of the sealing sleeve, and a guide is provided between the other end of the sealing sleeve and the oil seal seat. An upper seat and a lower seat are fixedly connected to the outer circumference of the inner cylinder, and the outer circular surfaces of the upper and lower seats are sealed with the inner circular surface of the outer cylinder. The airbag is located at both ends. The connecting rod is connected to the upper and lower seats respectively. It passes through the oil seal seat and the guide in sequence and extends into the sealing sleeve. The inner end of the connecting rod is equipped with a piston whose outer circular surface and the inner circular surface of the sealing sleeve form a sealing fit. The pump cylinder is set inside the connecting rod. The pump rod is hollow and open at both ends. One end of the pump rod is connected to the bottom valve sub-assembly, and the other end of the pump rod extends into the pump cylinder. The pump cylinder and the pump rod are respectively equipped with a first check valve and a second check valve at the ends away from the bottom valve sub-assembly. A height sensor is installed on the outer periphery of the pump rod. When the pump cylinder and the pump rod return to their original position after compression, a vacuum is formed inside the pump cylinder.

[0013] The present invention is further configured such that the height sensor is a sealing ring.

[0014] The present invention is further configured such that a first air chamber is provided between the outer cylinder and the sealing sleeve at a position corresponding to one side of the upper seat, and a second air chamber is provided between the outer cylinder and the airbag at a position corresponding to the other side of the upper seat. An inflation hole is provided on the outer cylinder at a position corresponding to the first air chamber and the second air chamber, and a projection weld screw is sealed and installed on the inflation hole.

[0015] The present invention is further configured such that the two ends of the airbag are respectively provided with a first sealing lip and a second sealing lip protruding inward in a circumferential direction, the outer circular surfaces of the first sealing lip and the second sealing lip are tightly fitted with the inner circular surface of the outer cylinder, and the outer circular surfaces of the upper seat and the lower seat are respectively provided with a first slot and a second slot for embedding the first sealing lip and the second sealing lip.

[0016] The present invention is further provided in that the first slot is provided with a retaining ring that abuts against the end of the first sealing lip.

[0017] The present invention is further provided that an O-ring for forming a sealing fit with the inner surface of the outer cylinder is also installed on the outer circular surface of the upper seat.

[0018] The present invention is further configured such that the first one-way valve includes a first limiting sleeve, a first buffer spring, and a first valve plate. The open end of the first limiting sleeve is sleeved on the end of the pump cylinder away from the bottom valve sub-assembly. A retaining spring is snapped onto the outer surface of the pump cylinder. The first limiting sleeve is provided with a limiting groove for the outer circle of the retaining spring to be embedded. One end of the first buffer spring abuts against the inner end of the first limiting sleeve, and the other end of the first buffer spring abuts against the other end of the first valve plate and presses the first valve plate tightly against the opening at the end of the pump cylinder.

[0019] The present invention is further configured such that the second one-way valve includes a second limiting sleeve, a second buffer spring, and a second valve plate. The open end of the second limiting sleeve is sleeved on the end of the pump rod away from the bottom valve sub-assembly. The outer circumference of the pump rod is provided with a limiting groove. The second limiting sleeve is provided with a riveting protrusion that is embedded in the limiting groove. One end of the second buffer spring abuts against the inner end of the second limiting sleeve, and the other end of the second buffer spring abuts against the other end of the second valve plate and presses the second valve plate tightly at the opening at the end of the pump rod.

[0020] Compared with the prior art, the present invention has the following beneficial effects: (1) Improved boosting efficiency: By adding a height sensor (sealing ring), the shock absorber can quickly respond to changes in vehicle height, and the boosting efficiency is improved by about 30% compared with the traditional design.

[0021] (2) More stable and precise air pressure control: The new inflation process makes air pressure control more stable, and the air pressure fluctuation range is reduced to ±0.05MPa, which significantly improves the performance consistency of the shock absorber.

[0022] (3) Enhanced sealing performance: The improved airbag upper seat sealing structure can withstand greater air pressure, and the sealing performance is improved by about 40%, which effectively avoids air pressure leakage and deformation problems and extends the service life of the shock absorber.

[0023] In summary, the shock absorber of this invention can better adapt to the dynamic changes of vehicles, significantly improve vehicle ride comfort and body stability, while reducing production costs and maintenance difficulty, and has broad market application prospects. Attached Figure Description

[0024] Figure 1 This is a schematic diagram showing the state of the shock absorber when the vehicle body height is such that the lifting function is in effect. Figure 2 Demonstration of the hydraulic circuit for the lifting function of the shock absorber Figure 1 ; Figure 3 Demonstration of the hydraulic circuit for the lifting function of the shock absorber Figure 2 ; Figure 4This is a diagram showing the oil circuit of the shock absorber when the vehicle body is raised to the design height. Figure 5 This is a schematic diagram of the connection structure between the inner cylinder and the airbag. Figure 6 This is a schematic diagram of the installation structure of the first check valve; Figure 7 This is a schematic diagram of the installation structure of the second check valve.

[0025] In the diagram: 1. Outer cylinder; 2. Inner cylinder; 3. Sealing sleeve; 4. Connecting rod; 5. Pump cylinder; 6. Pump rod; 7. Air bladder; 8. End cap; 9. Oil seal seat; 10. Bottom valve sub-assembly; 11. Guide; 12. Upper seat; 13. Lower seat; 14. Piston; 15. First check valve; 16. Second check valve; 17. Height sensor; 18. First air chamber; 19. Second air chamber; 20. Inflation port; 21. 21. Projection weld screw; 22. First sealing lip; 23. Second sealing lip; 24. First retaining groove; 25. Second retaining groove; 26. Retaining ring; 27. O-ring; 28. First limiting sleeve; 29. ​​First buffer spring; 30. First valve plate; 31. Snap ring; 32. Limiting groove; 33. Second limiting sleeve; 34. Second buffer spring; 35. Second valve plate; 36. Limiting retaining groove; 37. Riveted protrusion. Detailed Implementation

[0026] 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.

[0027] Example: As attached Figures 1-7The shock absorber shown includes an outer cylinder, an inner cylinder, a sealing sleeve, a connecting rod, a pump cylinder, a pump rod, and an airbag. The sealing sleeve is coaxially disposed inside the outer cylinder. One end of the outer cylinder is fixedly connected to an end cap, and the other end of the outer cylinder is sealed with an oil seal seat. A bottom valve sub-assembly is installed at one end of the sealing sleeve, and a guide is provided between the other end of the sealing sleeve and the oil seal seat. The inner cylinder is disposed on the outer periphery of the sealing sleeve, and there is an air gap between the two. An upper seat and a lower seat are fixedly connected to the outer periphery of the inner cylinder, and the outer circular surfaces of the upper and lower seats are sealed with the inner circular surface of the outer cylinder. The two ends of the airbag are respectively connected to the upper and lower seats. The connecting rod passes through the oil seal seat and the guide in sequence and extends into the sealing sleeve. The inner end of the connecting rod is equipped with an outer circular surface that forms a seal with the inner circular surface of the sealing sleeve. The pump cylinder is housed within a connecting rod, and the pump rod is hollow with openings at both ends. One end of the pump rod is connected to a bottom valve assembly, and the other end extends into the pump cylinder. A first check valve and a second check valve are respectively located at the ends of the pump cylinder and pump rod furthest from the bottom valve assembly. A height sensor, specifically a sealing ring, is mounted on the outer periphery of the pump rod. When the height sensor enters the pump cylinder (i.e., the vehicle body descends to a dangerous height), the presence of the two check valves makes the pump cylinder and pump rod a separate system. During compression, the first check valve on the pump cylinder opens, pushing oil into the high-pressure chamber. During recovery, due to the presence of the height sensor, a vacuum is created inside the pump cylinder, and the second check valve on the pump rod opens, pushing oil into the pump cylinder, thus achieving a faster pressurization response. The sealing ring design of the height sensor effectively prevents external environmental influences during operation, ensuring long-term stable operation. This design also reduces the dimensional accuracy requirements of the pump cylinder and pump rod, significantly reducing production costs.

[0028] As attached Figures 1-4 As shown, a first air chamber is provided between the outer cylinder and the sealing sleeve on one side corresponding to the upper seat, and a second air chamber is provided between the outer cylinder and the airbag on the other side corresponding to the upper seat. An inflation hole is provided on the outer cylinder corresponding to the first and second air chambers, and a projection-welded screw is sealed to the inflation hole. An external projection-welded inflation process is adopted. A hole is drilled in the outer cylinder, and a special tooling is used to tightly seal the outer cylinder. An air pipe is connected to the tooling for inflation, and a nitrogen cylinder pressure regulator ensures stable inflation pressure. Simultaneously, the inflation hole on the outer cylinder is sealed with a projection-welded screw. This process allows for filling the low-pressure chamber first and then the high-pressure chamber, enabling more precise production and consistency with design parameters, while also reducing production costs and maintenance difficulty.

[0029] As attached Figure 5As shown, the airbag has a first sealing lip and a second sealing lip protruding inwards at both ends. The outer surfaces of the first and second sealing lips fit tightly against the inner surface of the outer cylinder. The outer surfaces of the upper and lower seats each have a first groove and a second groove for the first and second sealing lips to be inserted. An O-ring is also installed on the outer surface of the upper seat to form a sealing fit with the inner surface of the outer cylinder. In other words, in addition to the airbag's own sealing lip, an extra sealing ring is added at the upper end, forming a double seal. Even if the airbag lip fails, gas leakage can be prevented, allowing it to withstand greater air pressure. This improvement significantly enhances the sealing performance of the shock absorber, avoids air pressure leakage or deformation problems, and ensures the long-term stability and reliability of the air pressure regulation function.

[0030] As attached Figure 5 As shown, the first slot is provided with a retaining ring that abuts against the end of the first sealing lip, which can ensure the compactness of the first sealing lip installation and thus improve its sealing performance.

[0031] As attached Figure 6 As shown, the first one-way valve includes a first limiting sleeve, a first buffer spring, and a first valve plate. The open end of the first limiting sleeve is sleeved on the end of the pump cylinder away from the bottom valve sub-assembly. A retaining spring is snapped onto the outer surface of the pump cylinder. The first limiting sleeve is provided with a limiting groove for the outer circle of the retaining spring to be embedded. It is formed by riveting. One end of the first buffer spring abuts against the inner end of the first limiting sleeve, and the other end of the first buffer spring abuts against the other end of the first valve plate and presses the first valve plate tightly at the opening at the end of the pump cylinder. That is, the first valve plate can only move in the direction of compressing the first buffer spring.

[0032] As attached Figure 6 As shown, the second one-way valve includes a second limiting sleeve, a second buffer spring, and a second valve plate. The open end of the second limiting sleeve is fitted onto the end of the pump rod away from the bottom valve sub-assembly. The outer circumference of the pump rod is provided with a limiting groove. The second limiting sleeve is provided with a riveting protrusion that is embedded in the limiting groove. One end of the second buffer spring abuts against the inner end of the second limiting sleeve, and the other end of the second buffer spring abuts against the other end of the second valve plate, pressing the second valve plate tightly against the opening at the end of the pump rod. That is, the second valve plate can only move in the direction of compressing the second buffer spring.

Claims

1. A shock absorber with damping function and automatic vehicle body leveling system, comprising an outer cylinder, an inner cylinder, a sealing sleeve, a connecting rod, a pump cylinder, a pump rod, and an airbag, wherein the sealing sleeve is coaxially disposed inside the outer cylinder, an end cap is fixedly connected to one end of the outer cylinder, an oil seal seat is sealed and installed at the other end of the outer cylinder, a bottom valve sub-assembly is installed at one end of the sealing sleeve, a guide is provided between the other end of the sealing sleeve and the oil seal seat, and an upper seat and a lower seat are fixedly connected to the outer periphery of the inner cylinder, the outer circular surfaces of the upper seat and the lower seat being sealed to the inner circular surface of the outer cylinder. In this configuration, the airbag is connected at both ends to the upper and lower seats respectively. The connecting rod passes through the oil seal seat and the guide in sequence and extends into the sealing sleeve. A piston with an outer circular surface that seals against the inner circular surface of the sealing sleeve is installed at the inner end of the connecting rod. The pump cylinder is located within the connecting rod. The pump rod is hollow and open at both ends. One end of the pump rod is connected to the bottom valve assembly, and the other end extends into the pump cylinder. A first check valve and a second check valve are respectively provided at the ends of the pump cylinder and pump rod furthest from the bottom valve assembly. The feature is that: A height sensor is installed on the outer periphery of the pump rod. When the pump cylinder and pump rod return to their original position after compression, a vacuum is formed inside the pump cylinder.

2. The shock absorber with damping function and automatic vehicle body leveling system according to claim 1, characterized in that: The height sensor is a sealing ring.

3. A shock absorber with damping function and automatic vehicle body leveling system according to claim 1, characterized in that: A first air chamber is provided between the outer cylinder and the sealing sleeve on one side of the upper seat, and a second air chamber is provided between the outer cylinder and the airbag on the other side of the upper seat. An inflation hole is provided on the outer cylinder at the position corresponding to the first air chamber and the second air chamber, and a projection weld screw is sealed on the inflation hole.

4. A shock absorber with damping function and automatic vehicle body leveling system according to claim 3, characterized in that: The airbag has a first sealing lip and a second sealing lip that protrude inward in both ends. The outer circular surfaces of the first sealing lip and the second sealing lip are in close contact with the inner circular surface of the outer cylinder. The outer circular surfaces of the upper seat and the lower seat are respectively provided with a first slot and a second slot for the first sealing lip and the second sealing lip to be inserted.

5. A shock absorber with damping function and automatic vehicle body leveling system according to claim 4, characterized in that: The first slot is provided with a retaining ring that abuts against the end of the first sealing lip.

6. A shock absorber with damping function and automatic vehicle body leveling system according to claim 4, characterized in that: The outer circular surface of the upper seat is also equipped with an O-ring for forming a sealing fit with the inner circular surface of the outer cylinder.

7. A shock absorber with damping function and automatic vehicle body leveling system according to claim 1, characterized in that: The first one-way valve includes a first limiting sleeve, a first buffer spring, and a first valve plate. The open end of the first limiting sleeve is sleeved on the end of the pump cylinder away from the bottom valve sub-assembly. A retaining spring is snapped onto the outer surface of the pump cylinder. The first limiting sleeve is provided with a limiting groove for the outer circle of the retaining spring to be embedded. One end of the first buffer spring abuts against the inner end of the first limiting sleeve, and the other end of the first buffer spring abuts against the other end of the first valve plate and presses the first valve plate tightly at the opening at the end of the pump cylinder.

8. A shock absorber with damping function and automatic vehicle body leveling system according to claim 1, characterized in that: The second one-way valve includes a second limiting sleeve, a second buffer spring, and a second valve plate. The open end of the second limiting sleeve is fitted onto the end of the pump rod away from the bottom valve sub-assembly. The outer circumference of the pump rod is provided with a limiting groove. The second limiting sleeve is provided with a riveting protrusion that is embedded in the limiting groove. One end of the second buffer spring abuts against the inner end of the second limiting sleeve, and the other end of the second buffer spring abuts against the other end of the second valve plate, pressing the second valve plate tightly against the opening at the end of the pump rod.

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