Shock absorber for motor vehicle test

Abstract

The utility model relates to the technical field of shock absorbers, in particular to a shock absorber for a motor vehicle test, which comprises a cylinder body, a gland is arranged at the outer end part of the cylinder body, and a piston rod which reciprocates along the axial direction of the cylinder body and penetrates through the gland is arranged in the cylinder body; the guider is located in the cylinder body and close to the gland end, the guider is provided with a sealing cavity used for installing an oil seal, and the sealing cavity is provided with a pressure connector used for measuring pressure; the working piston is located in the barrel and connected with the piston rod, and an inner cavity of the barrel is divided into an oil cavity and an oil-free cavity by the working piston; the floating piston is located in the oil-free cavity, an air cavity is formed by the floating piston and the inner bottom of the cylinder body, and a ventilation connector communicated with compressed air is formed in the side wall of the air cavity. A designer can adjust the performance parameters of the sealing piece in time, and it is guaranteed that the performance of the shock absorber meets the working condition requirement.

Description

Technical Field

[0001] This utility model relates to the field of vibration damper technology, and in particular to a vibration damper for motor vehicle testing. Background Technology

[0002] With the development of the motor vehicle industry, the demand for motor vehicle parts is large, and the quality requirements for products are becoming increasingly stringent. As an important component in the safe operation of motor vehicles, shock absorbers need to undergo strict quality inspection and testing before leaving the factory. However, the current routine testing process mainly focuses on the fatigue test of shock absorbers. The changes in oil pressure inside the shock absorber cannot be monitored in real time. As a result, designers cannot make timely judgments and adjustments to the performance of the seals based on changes in the oil pressure inside the shock absorber. This can easily lead to the omission of defective shock absorbers, resulting in batch quality defects. It may also lead to a significant over-performance of the sealing materials, resulting in excessively high manufacturing costs, which is not conducive to manufacturers' production cost control. Utility Model Content

[0003] Technical objective: In order to overcome the shortcomings of the existing technology, this utility model provides a shock absorber for motor vehicle testing.

[0004] Technical solution: To achieve the above objectives, this utility model discloses a shock absorber for motor vehicle testing, comprising:

[0005] A cylinder body, wherein a pressure cap is provided at the outer end of the cylinder body, and a piston rod is provided inside the cylinder body that reciprocates along its axial direction and passes through the pressure cap;

[0006] A guide is located inside the cylinder and near the gland end. The guide is provided with a sealing cavity for installing an oil seal, and the sealing cavity is provided with a pressure measuring port.

[0007] A working piston, located inside the cylinder and connected to the piston rod, divides the inner cavity of the cylinder into an oil-filled chamber and an oil-free chamber.

[0008] A floating piston is located inside the oil-free chamber, forming an air chamber with the bottom of the cylinder. The side wall of the air chamber is provided with a vent interface that communicates with compressed air.

[0009] Preferably, the pressure port is located below the oil seal and penetrates the cylinder and the side wall of the gland.

[0010] Preferably, the guide is provided with at least one set of first sealing rings that circumferentially seal the inner wall of the cylinder near the end with the oil cavity.

[0011] Preferably, the working piston and the floating piston are each provided with at least one set of second sealing rings that circumferentially seal with the inner wall of the cylinder.

[0012] Preferably, both the first sealing ring and the second sealing ring are O-rings.

[0013] Preferably, the outer bottom end of the cylinder is provided with a fixed seat, and the outer extension end of the piston rod is provided with a connecting thread.

[0014] Preferably, the pressure port is connected to a pressure gauge or pressure sensor via a thread, and the vent port is connected to an external air pressure pipeline via a thread, with a switch valve provided on the air pressure pipeline.

[0015] The beneficial effects of this utility model are:

[0016] 1. This device simulates the actual working conditions of the vibration damper for performance testing. Compressed air is supplied to the air chamber through the venting port, using the gas to simulate the buffering function of the vibration damper. A pressure gauge or pressure sensor is installed on the pressure port to monitor the oil pressure changes inside the vibration damper in real time during the test. This allows for immediate detection of seal leakage within the vibration damper, helping designers to adjust the performance parameters of the seals in a timely and targeted manner, ensuring that the performance of the vibration damper meets the requirements of various operating conditions.

[0017] 2. The gas pressure in the air chamber can be adjusted through the venting interface to simulate the use of the shock absorber under different working conditions, maximize the testing of the shock absorber's performance, and find the optimal application conditions for the shock absorber. Attached Figure Description

[0018] Figure 1 This is a perspective view of the overall structure of this utility model;

[0019] Figure 2 Appendix to this utility model Figure 1 Enlarged view of region A in the middle;

[0020] Figure 3 Appendix to this utility model Figure 1 A magnified view of region B in the middle.

[0021] In the diagram, 1. cylinder; 2. gland; 3. piston rod; 4. guide; 5. oil seal; 6. sealing cavity; 7. working piston; 8. oil-filled cavity; 9. oil-free cavity; 10. floating piston; 11. air cavity; 12. vent port; 13. pressure port; 14. first sealing ring; 15. second sealing ring; 16. fixed seat; 17. connecting thread. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1 To be continued Figure 3 The principles and features of this utility model are described, and the examples given are only used to explain this utility model and are not intended to limit the scope of this utility model.

[0023] A vibration damper for motor vehicle testing, used to simulate the application conditions of vibration dampers for sealing performance testing, such as... Figures 1-3 As shown, it includes a cylinder 1, a guide 4, a working piston 7, and a floating piston 10. Further, the cylinder 1 has a pressure cap 2 at its outer end, and a piston rod 3 inside the cylinder 1 that moves back and forth along the axial direction of the cylinder 1 and passes through the pressure cap 2. The outer extension end of the piston rod 3 has a connecting thread 17, which can be connected to a motor vehicle or test fixture to simulate vehicle driving conditions for testing. The outer bottom end of the cylinder 1 has a fixing seat 16 for fixing the shock absorber during the test.

[0024] The piston rod 3 is located at the inner end of the cylinder 1 and is connected to the working piston 7. The working piston 7 divides the inner cavity of the cylinder 1 into an oil-filled chamber 8 and an oil-free chamber 9. The oil-filled chamber 8 stores liquid oil.

[0025] The guide 4 is located inside the cylinder 1 and close to the end of the gland 2. The guide 4 is provided with a sealing cavity 6 for installing the oil seal 5. The oil seal 5 can effectively seal the gap between the gland 2 and the piston rod 3 to prevent oil leakage. The oil seal 5 can be a skeleton seal or a skeletonless seal. Those skilled in the art can match it according to the actual test needs.

[0026] To ensure accuracy during the test and avoid leaks affecting the results, the guide 4 is provided with at least one set of first sealing rings 14 near the oil cavity 8, which circumferentially seal the inner wall of the cylinder 1. In this embodiment, the first sealing ring 14 is an O-ring, or it can be a Y-ring well known to those skilled in the art. The number of first sealing rings 14 is one, or two or more can be provided at intervals.

[0027] During the test, high pressure was concentrated at the guide 4. Pressurized oil in the oil chamber 8 entered the sealing chamber 6 through the gap between the piston rod 3 and the guide 4. In order to accurately obtain the pressure change inside the shock absorber, the sealing chamber 6 is equipped with a pressure measuring port 13. Specifically, the pressure port 13 is located below the oil seal 5. For the convenience of production and processing, the pressure port 13 directly penetrates the side wall of the cylinder 1 and the pressure cap 2 and is connected to a pressure gauge or pressure sensor through threads. The internal pressure change is monitored in real time, and the leakage of the seal inside the shock absorber can be grasped at the first time. This helps the designers to adjust the performance parameters of the seal in a timely and targeted manner.

[0028] Furthermore, to simulate the damping effect during vibration damping operation, the floating piston 10 is located within the oil-free chamber 9, forming an air chamber 11 with the inner bottom of the cylinder 1. The side wall of the air chamber 11 is provided with a vent 12 that communicates with compressed air. The vent 12 is connected to an external air pressure pipeline via a thread, and a switch valve is provided on the air pressure pipeline. By filling the air chamber 11 with air of different pressures through the vent 12, the gas pressure within the air chamber 11 can be adjusted to simulate the vibration damper's operation under different working conditions, maximizing the testing of the vibration damper's performance and identifying the optimal application conditions. The floating piston 10 effectively seals the gas filling the air chamber 11, preventing leakage into the oil-containing chamber 8. Both the working piston 7 and the floating piston 10 are provided with at least one set of second sealing rings 15 that circumferentially seal the inner wall of the cylinder 1. In this embodiment, the working piston 7 and the floating piston 10 are each provided with a second sealing ring 15. The second sealing rings 15 are all O-rings. Of course, those skilled in the art can also provide two or more second sealing rings 15 at intervals on the working piston 7 and the floating piston 10 to ensure the sealing effect. The second sealing ring 15 can also be a Y-type sealing ring well known in the art.

[0029] During the test, the connecting thread 17 of the outer extension end of the piston rod 3 is connected to the motor vehicle or the test equipment. The piston rod 3 can achieve reciprocating motion by external force. The pressure air source fills the air chamber 11 with gas of different pressures through the air inlet 12 to simulate the buffering effect of the shock absorber under different working conditions. The pressure inlet 13 is equipped with a pressure gauge or pressure sensor to monitor the oil pressure change in real time during the test. The designer obtains the oil pressure change data, grasps the leakage of the internal seal of the shock absorber in time, and adjusts the performance parameters of the seal in a timely and targeted manner to ensure that the performance of the shock absorber meets the requirements of various operating conditions.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A shock absorber for testing motor vehicles, characterized in that: include A cylinder (1) is provided with a pressure cap (2) at its outer end, and a piston rod (3) is provided inside the cylinder (1) that moves back and forth along its axial direction and passes through the pressure cap (2); The guide (4) is located inside the cylinder (1) and close to the end of the gland (2). The guide (4) is provided with a sealing cavity (6) for installing the oil seal (5). The sealing cavity (6) is provided with a pressure measuring port (13). The working piston (7) is located inside the cylinder (1) and connected to the piston rod (3), dividing the inner cavity of the cylinder (1) into an oil-filled chamber (8) and an oil-free chamber (9); A floating piston (10) is located in the oil-free chamber (9) and forms an air chamber (11) with the bottom of the cylinder (1). The side wall of the air chamber (11) is provided with a ventilation port (12) that communicates with compressed air.

2. The shock absorber for motor vehicle testing according to claim 1, characterized in that: The pressure port (13) is located below the oil seal (5) and penetrates the side wall of the cylinder (1) and the gland (2).

3. The vibration damper for motor vehicle testing according to claim 1, characterized in that: The guide (4) is provided with at least one set of first sealing rings (14) that are circumferentially sealed to the inner wall of the cylinder (1) at the end near the oil cavity (8).

4. The vibration damper for motor vehicle testing according to claim 3, characterized in that: The working piston (7) and the floating piston (10) are each provided with at least one set of second sealing rings (15) that are circumferentially sealed to the inner wall of the cylinder (1).

5. The shock absorber for motor vehicle testing according to claim 4, characterized in that: Both the first sealing ring (14) and the second sealing ring (15) are O-rings.

6. The vibration damper for motor vehicle testing according to claim 1, characterized in that: The outer bottom end of the cylinder (1) is provided with a fixed seat (16), and the outer extension end of the piston rod (3) is provided with a connecting thread (17).

7. The shock absorber for motor vehicle testing according to claim 1, characterized in that: The pressure port (13) is connected to a pressure gauge or pressure sensor via a thread, and the vent port (12) is connected to an external air pressure pipeline via a thread, with a switch valve provided on the air pressure pipeline.

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