An air spring simulation tool for oil seal test

Abstract

This application relates to the technical field of vibration damper testing equipment, and in particular to a spring simulation fixture for oil seal testing. The fixture includes a fixture body, which is sleeved on a connecting rod and detachably fixed to an outer cylinder. The fixture body includes a housing and a top cover detachably fixed to the end of the housing. A connecting ring is installed on the fixture body to seal the gap between the top of the housing and the top cover. The fixture body also has a first oil seal, with the connecting ring located at the end of the connecting rod and in contact with the oil lip of the first oil seal. A pressure ring is also installed on the fixture body to seal the gap between the tail end of the housing and the outer cylinder, located at the end of the outer cylinder and in contact with the air lip of a second oil seal. A cavity is formed between the air lips of the first and second oil seals. This application utilizes external equipment to supply gas into the cavity through an air vent, using the fixture body to simulate an air spring, thereby simulating the working environment of the air lip.

Description

Technical Field

[0001] This application relates to the technical field of vibration damper testing equipment, and in particular to a spring simulation fixture for oil seal testing. Background Technology

[0002] Shock absorbers are key components that ensure the smoothness of vehicle driving. Their performance directly affects the driving experience and safety. Air springs achieve a buffering effect through compressed air in the airbag. They work together with shock absorbers to form the vehicle's suspension system. With their adjustable stiffness, good comfort and load-bearing capacity, they are gradually replacing traditional coil springs.

[0003] like Figure 1 and Figure 2 As shown, the oil seal 1, as a core component of the automotive shock absorber system, is located at the upper opening of the outer cylinder 115 of the shock absorber, that is, at the part where the connecting rod 114 extends from the outer cylinder 115. The oil seal 1 is installed on the guide 116. The outer end face area of ​​the oil seal 1 is called the sealing lip 111. The side of the sealing lip 111 facing inward is called the oil lip 112, which is used to prevent liquid media from leaking outward. The side of the sealing lip 111 facing outward is called the air lip 113, which is used to prevent gas from entering the oil seal 1. In traditional oil seals, the air lip 113 is mainly used to prevent external dust and other contaminants from entering the shock absorber. However, in air spring shock absorbers, the air lip 113 of the oil seal 1 needs to withstand the huge pressure inside the air spring bladder to prevent high-pressure air from entering the shock absorber and affecting the normal operation and service life of the shock absorber. Therefore, testing and verifying the compressive strength and durability of the air lip 113 of the oil seal 1 is an important part of the shock absorber development process.

[0004] In the existing technology, the sealing performance of the oil seal lip on the air spring shock absorber needs to be verified to withstand high-pressure gas. The oil seal lip at the connecting rod and outer cylinder needs to be verified. However, a complete air spring and related parts are usually required to conduct the test. This means that the oil seal test verification cannot be carried out before the air spring technology is locked in, which increases the research and development cycle and cost.

[0005] Therefore, a spring-loaded simulation fixture is needed for oil seal testing to meet the testing requirements during the oil seal development stage and to verify the performance of the upper lip of the oil seal. Utility Model Content

[0006] In order to successfully conduct oil seal tests without the presence of a matching air spring and without being affected by the air spring's effect on the interface between the parts and the air spring, this application provides an air spring simulation fixture for oil seal tests.

[0007] This application provides a spring simulation fixture for oil seal testing, which adopts the following technical solution: A spring-loaded simulation fixture for oil seal testing includes a fixture body, which is sleeved on a connecting rod and detachably fixed to an outer cylinder. The fixture body includes an outer shell, a top cover detachably fixed to the end of the outer shell, and a first oil seal for sealing the connection between the outer shell and the top cover. The fixture body is equipped with a connecting ring that seals the gap between the top of the outer shell and the top cover. The fixture body is also provided with the first oil seal. The connecting ring is located at the end of the connecting rod and is in contact with the oil lip of the first oil seal. The fixture body is also equipped with a pressure ring that seals the gap between the tail end of the outer shell and the outer cylinder. The pressure ring is located at the end of the outer cylinder and is in contact with the air lip of a second oil seal. A cavity is formed between the air lip of the first oil seal and the air lip of the second oil seal. The fixture body has an air hole penetrating the inside and outside of the outer shell. The air hole is connected to an external device for supplying gas into the cavity.

[0008] By adopting the above technical solution, the tooling body and the outer cylinder can be detachably fixed, which facilitates the installation and disassembly of the tooling body. The gaps at the connection between the connecting ring sealing shell and the top cover, and the gaps at the connection between the pressure ring sealing shell and the outer cylinder, ensure the sealing performance of the cavity. The air lips of the first oil seal and the second oil seal are located at both ends of the cavity, which facilitates the testing of the air lips on the second oil seal at the end of the outer cylinder. The air lips on both sides of the cavity further enhance the sealing performance of the cavity. Gas is delivered to the cavity through the air hole using external equipment, and the tooling body is used to simulate the air spring, thereby simulating the working environment of the air lip. This method has the characteristics of low cost and short time consumption.

[0009] Optionally, the inner side of the housing is provided with a first positioning step for positioning the connecting ring along the axial position of the tooling body, and the first positioning step is in contact with the bottom end of the connecting ring.

[0010] By adopting the above technical solution, the setting of the first positioning step can position the connecting ring along the axial direction of the tooling body, ensuring that the connecting ring is accurately installed in the appropriate position and guaranteeing the sealing effect of the tooling body.

[0011] Optionally, the connecting ring has an installation groove for installing a first oil seal, the oil lip of the first oil seal is in contact with the inner wall of the installation groove, and the air lip of the first oil seal is in contact with the end face of the first positioning step.

[0012] By adopting the above technical solution, the first oil seal is installed in the mounting groove, so that the oil lip of the first oil seal fits against the inner wall of the mounting groove and the air lip fits against the end face of the first positioning step, thereby achieving stable installation and positioning of the first oil seal. By utilizing the gas sealing performance of the air lip of the first oil seal, the sealing performance of the tooling body is ensured, thereby improving the test effect of the oil seal.

[0013] Optionally, the inner side of the housing is provided with a second positioning step for positioning the pressure ring along the axial position of the tooling body, and the second positioning step is in contact with the top end of the pressure ring.

[0014] By adopting the above technical solution, the second positioning step fits into the top of the pressure ring, which can accurately position the pressure ring along the axial direction of the tooling body, ensuring the sealing effect of the tooling body.

[0015] Optionally, the housing is fixedly fitted with a first sealing element that seals the gap at the connection between the top of the pressure ring and the second positioning step.

[0016] By adopting the above technical solution, the gap at the connection between the top of the pressure ring and the second positioning step can be effectively prevented by using the first sealing element to seal the gap, thereby further improving the sealing performance of the tooling body.

[0017] Optionally, an annular groove for mounting the outer cylinder is also provided on the inner side of the bottom end of the outer shell. The inner wall of the annular groove is in contact with the outer side of the outer cylinder, the outer side of the pressure ring is in contact with the inner side of the outer cylinder, and the step surface of the second positioning step is in contact with the end face of the outer cylinder.

[0018] By adopting the above technical solution, the outer cylinder is installed using the annular groove of the outer shell. The outer side of the outer cylinder is in contact with the inner wall of the annular groove, the inner side of the outer cylinder is in contact with the outer side of the pressure ring, and the end face of the outer cylinder is in contact with the step surface of the second positioning step. This ensures a tight connection and accurate assembly between the tooling and the outer cylinder, improves the sealing performance at the connection between the outer cylinder and the tooling body, and is conducive to more accurately simulating the working state of the air spring to conduct oil seal pressure resistance and durability tests.

[0019] Optionally, the pressure ring is also fixedly installed with a second sealing element that seals the gap at the connection between the outer side of the pressure ring and the inner side of the outer cylinder.

[0020] By adopting the above technical solution, the second seal is located at the connection between the outer side of the pressure ring and the inner side of the outer cylinder, which further enhances the sealing performance of the connection between the outer side of the pressure ring and the inner side of the outer cylinder and ensures the airtightness of the cavity.

[0021] Optionally, an airflow channel is formed between the cavity and the periphery of the connecting rod, with the air lip of the first oil seal and the air lip of the second oil seal located at opposite ends of the airflow channel.

[0022] By adopting the above technical solution, the first oil seal lip and the second oil seal lip are located at opposite ends of the airflow channel. By utilizing the sealing property of the lip for the gas, the sealing property of the cavity and the airflow channel is ensured, so that the tooling body can more accurately simulate the air spring for testing.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. By using external equipment to deliver gas into the cavity through the air hole, and using the tooling body to simulate the air spring, the working environment of the air lip can be simulated. This method has the characteristics of low cost and short time consumption. 2. The first positioning step can position the connecting ring along the axial direction of the tooling body, ensuring that the connecting ring is accurately installed in the appropriate position and guaranteeing the sealing effect of the tooling body; 3. The outer cylinder is installed using the annular groove of the outer shell. The outer side of the outer cylinder is in contact with the inner wall of the annular groove, the inner side of the outer cylinder is in contact with the outer side of the pressure ring, and the end face of the outer cylinder is in contact with the step surface of the second positioning step. This ensures a tight connection and accurate assembly between the tooling and the outer cylinder, improves the sealing performance at the connection between the outer cylinder and the tooling body, and is conducive to more accurately simulating the working state of the air spring to conduct oil seal pressure resistance and durability tests. Attached Figure Description

[0024] Figure 1 This is a structural diagram of the oil seal, connecting rod, and outer cylinder, used to illustrate the installation relationship between the oil seal, connecting rod, and outer cylinder; Figure 2 This is a structural diagram of an oil seal, used to show the placement of the air lip and oil lip of the oil seal; Figure 3 This is a structural schematic diagram of an embodiment of the present application, used to illustrate the overall structure of the tooling body; Figure 4 This is an exploded view of an embodiment of this application, used to show the internal structure of the tooling body; Figure 5 This is a partial cross-sectional view of an embodiment of this application, used to illustrate the installation relationship between the first oil seal and the second oil seal; Figure 6 for Figure 5 An enlarged schematic diagram of section A in the middle, used to show the location of the first positioning step; Figure 7 for Figure 5 The enlarged diagram of section B shows the location of the second positioning step.

[0025] Reference numerals: 1. Oil seal; 111. Sealing lip; 112. Oil lip; 113. Air lip; 114. Connecting rod; 115. Outer cylinder; 116. Guide; 2. Tooling body; 211. Connecting ring; 212. Mounting groove; 221. Pressure ring; 222. Second seal; 3. Top cover; 311. Round hole; 4. Outer shell; 411. Air hole; 412. First positioning step; 413. Second positioning step; 414. First seal; 415. Annular groove; 5. First oil seal; 6. Second oil seal; 7. Cavity; 8. Airflow channel. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0027] Example: A spring simulation fixture for oil seal testing, reference Figure 1 and Figure 3 The fixture includes a tooling body 2, which comprises a top cover 3 and a housing 4. The housing 4 is cylindrical in shape. The top cover 3 is detachably fixed to one end of the housing 4 via a threaded connection. The tooling body 2 is fitted onto the connecting rod 114 through an opening at the other end of the housing 4. The top cover 3 has a circular hole 311 for the connecting rod 114 to extend out. The housing 4 is detachably fixed to the outer cylinder 115, facilitating the installation and disassembly of the tooling body 2. Figure 4 A connecting ring 211 is installed at the connection between the top of the outer shell 4 and the top cover 3. The tooling body 2 is also provided with a first oil seal 5, which is installed in an inverted manner to enhance the sealing performance of the tooling body 2. The oil lip 112 of the first oil seal 5 fits against the connecting ring 211, and the air lip 113 of the first oil seal 5 faces the tail end of the tooling body 2. A pressure ring 221 is installed at the connection between the tail end of the outer shell 4 and the outer cylinder 115. The second oil seal 6 is installed in a normal manner and is the test object in this embodiment. The air lip of the second oil seal 6... 113 is fitted to the pressure ring 221. A sealed cavity 7 is formed between the air lip 113 of the first oil seal 5 and the air lip 113 of the second oil seal 6. The tooling body 2 has an air hole 411. The air hole 411 penetrates the inside and outside of the outer shell 4 and communicates with the cavity 7. The air hole 411 is connected to an external device. In this embodiment, the external device includes an air pump. High-pressure gas is delivered into the cavity 7 through the external device, so that a high-pressure environment is formed in the cavity 7, simulating the working state of the air spring, and realizing the test of the air lip 113 of the second oil seal 6.

[0028] refer to Figure 5 and Figure 6 The inner side of the outer casing 4 is provided with a first positioning step 412, which is located at the top of the outer casing 4. The step surface of the first positioning step 412 fits against the bottom end of the connecting ring 211. The bottom end of the connecting ring 211 is provided with a mounting groove 212, and the first oil seal 5 is installed in the mounting groove 212. Figure 2 The oil lip 112 of the first oil seal 5 is in contact with the inner wall of the mounting groove 212, and the air lip 113 of the first oil seal 5 is in contact with the end face of the first positioning step 412.

[0029] refer to Figure 5 and Figure 7 The inner side of the outer shell 4 is also provided with a second positioning step 413. The second positioning step 413 is located at the tail end of the outer shell 4. The step surface of the second positioning step 413 fits against the top of the pressure ring 221. A first sealing element 414 is fixedly installed on the inner side of the outer shell 4. The first sealing element 414 adopts an O-ring rubber sealing ring. The first sealing element 414 is located between the step surface of the second positioning step 413 and the pressure ring 221, and the first sealing element 414 is embedded in the annular groove of the pressure ring 221.

[0030] refer to Figure 3and Figure 4 The inner side of the outer casing 4 is also provided with an annular groove 415, which, combined with Figure 1 The outer cylinder 115 is installed in the annular groove 415. The outer side of the outer cylinder 115 is in contact with the inner side of the annular groove 415. The top of the outer cylinder 115 is in contact with the step surface of the second positioning step 413. The inner side of the outer cylinder 115 is in contact with the outer side of the pressure ring 221.

[0031] refer to Figure 3 and Figure 4 A second sealing element 222 is fixedly installed on the outside of the pressure ring 221. The second sealing element 222 seals the gap at the connection between the outside of the pressure ring 221 and the inside of the outer cylinder 115. The second sealing element 222 is also embedded in another annular groove of the pressure ring 221. In this embodiment, the second sealing element 222 is a rubber sealing ring.

[0032] refer to Figure 1 and Figure 5 A sealed airflow channel 8 is formed between the cavity 7 and the periphery of the connecting rod 114, and then combined with... Figure 2 The airflow channel 8 is formed by the air lip 113 of the first oil seal 5, the air lip 113 of the second oil seal 6, the inner wall of the cavity 7, and the connecting rod 114. The air lip 113 of the first oil seal 5 and the air lip 113 of the second oil seal 6 are located at opposite ends of the airflow channel 8, which enhances the sealing of the airflow channel 8.

[0033] The implementation principle of this application embodiment is as follows: the tooling body 2 is sleeved on the connecting rod 114, and the tooling body 2 is connected and sealed to the outer cylinder 115. The sealing between the top of the outer shell 4 and the top cover 3 is achieved through the connecting ring 211 and the air lip 113 of the first oil seal 5. The sealing between the tail end of the outer shell 4 and the outer cylinder 115 is achieved through the pressure ring 221, the air lip 113 of the second oil seal 6, the first sealing element 414, and the second sealing element 222. The air lip 113 of the first oil seal 5, the air lip 113 of the second oil seal 6, the inner wall of the cavity 7, and the connecting rod 114 together form an airflow channel 8. The external equipment is connected to the air hole 411, and high-pressure gas is delivered to the cavity 7 through the external equipment to simulate the working state of the air spring and realize the pressure resistance and durability test of the air lip 113 of the second oil seal 6.

[0034] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An air spring simulation tool for oil seal test, comprising a tool body (2), characterized in that: The tooling body (2) is sleeved on the connecting rod (114) and detachably fixed to the outer cylinder (115). The tooling body (2) includes a shell (4) and a top cover (3) detachably fixed to the end of the shell (4). The tooling body (2) is equipped with a connecting ring (211) that seals the gap between the top of the shell (4) and the top cover (3). The tooling body (2) is also provided with a first oil seal (5). The connecting ring (211) is located at the end of the connecting rod (114) and fits against the oil lip (112) of the first oil seal (5). (2) A pressure ring (221) is also installed at the gap between the tail end of the sealing shell (4) and the outer cylinder (115). The pressure ring (221) is located at the end of the outer cylinder (115) and is in contact with the air lip (113) of the second oil seal (6). A cavity (7) is formed between the air lip (113) of the first oil seal (5) and the air lip (113) of the second oil seal (6). The tool body (2) is provided with an air hole (411) that penetrates the inside and outside of the shell (4). The air hole (411) is connected to an external device for conveying gas into the cavity (7).

2. The air spring simulation tooling for oil seal testing of claim 1, wherein: The inner side of the outer shell (4) is provided with a first positioning step (412) for positioning the connecting ring (211) along the axial position of the tooling body (2), and the first positioning step (412) is in contact with the bottom end of the connecting ring (211).

3. The air spring simulation tooling for oil seal testing of claim 2, wherein: The connecting ring (211) has an installation groove (212) for installing the first oil seal (5). The oil lip (112) of the first oil seal (5) is in contact with the inner wall of the installation groove (212), and the air lip (113) of the first oil seal (5) is in contact with the end face of the first positioning step (412).

4. The air spring simulation tooling for oil seal testing of claim 1, wherein: The inner side of the outer shell (4) is provided with a second positioning step (413) for positioning the pressure ring (221) along the axial position of the tooling body (2), and the second positioning step (413) is in contact with the top end of the pressure ring (221).

5. The air spring simulation tooling for oil seal testing of claim 4, wherein: The outer casing (4) is fixedly equipped with a first sealing element (414) that seals the gap at the connection between the top of the pressure ring (221) and the second positioning step (413).

6. The air spring simulation tooling for oil seal testing of claim 4, wherein: The inner side of the bottom end of the outer shell (4) is also provided with an annular groove (415) for installing the outer cylinder (115). The inner wall of the annular groove (415) is in contact with the outer side of the outer cylinder (115). The outer side of the pressure ring (221) is in contact with the inner side of the outer cylinder (115). The step surface of the second positioning step (413) is in contact with the end face of the outer cylinder (115).

7. The air spring simulation tooling for oil seal testing of claim 1, wherein: The pressure ring (221) is also fixedly installed with a second sealing element (222) that seals the gap at the connection between the outer side of the pressure ring (221) and the inner side of the outer cylinder (115).

8. The air spring simulation tooling for oil seal testing of claim 1, wherein: An airflow channel (8) is formed between the cavity (7) and the periphery of the connecting rod (114), and the air lip (113) of the first oil seal (5) and the air lip (113) of the second oil seal (6) are located at opposite ends of the airflow channel (8).

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