Lip seal lip test fixture

Abstract

The lip seal lip piece test tool comprises an oil seal seat installed on an axle system seal test machine, and a center hole is formed in the center of the oil seal seat for the oil seal axle to pass through, characterized in that: a pressure head is coaxially installed on the oil seal seat, a bottom sealing ring is press-fitted in the center hole, the measured lip piece is arranged in the center hole, the pressure head is inserted into the center hole to press the measured lip piece on the bottom sealing ring, the oil seal axle is separated from the pressure head and the bottom sealing ring without contact, and the oil seal axle is in interference fit with the measured lip piece to seal the center hole. The utility model realizes the sealing performance detection of the measured lip piece, meets the sealing performance detection requirements of the measured lip pieces with different inner diameters and thicknesses, improves the universality and practicality of the test tool, and improves the efficiency of the lip seal performance detection.

Description

Technical Field

[0001] This utility model relates to a testing fixture for lip plates of lip-shaped oil seals, used to test the sealing performance of the lip plates of lip-shaped oil seals. Background Technology

[0002] In any device that transmits power via a rotating shaft, the shaft must be supported by bearings. To ensure the safe, reliable, and long-lasting operation of the bearings, various forms of bearing lubrication are required. To prevent lubricant leakage, a lip seal is used to mate with the shaft to form a shaft seal, thus preventing lubricant leakage. To ensure the sealing performance of the lip seal, the sealing lip must be tested for sealing before the lip seal is formed.

[0003] A shaft seal testing machine is used to test the sealing reliability of shaft systems. It can be used to test the sealing reliability between the sealing ring and the shaft system. The machine mainly consists of a rotating shaft, a hydraulic chamber, and a hydraulic source. One end of the rotating shaft is connected to the drive equipment, and the other end extends into the hydraulic chamber. The hydraulic source is connected to the hydraulic chamber. The sealing ring is fitted onto the rotating shaft using a fixture to seal the hydraulic chamber. During the test, the rotating shaft simulates the working shaft system. As the shaft rotates, the hydraulic source supplies oil to the hydraulic chamber. By observing whether the oil leaks, the reliability of the seal between the sealing ring and the rotating shaft is determined, thus achieving the sealing test of the shaft system. The specifications of the sealing lips used in lip seals vary depending on their thickness, inner diameter, and material. The difficulty in using a shaft seal testing machine to test the inner diameter sealing of the sealing lips lies in the fact that the testing fixtures for the sealing lips cannot accommodate the installation of sealing lips with different thicknesses and inner diameters. Utility Model Content

[0004] The lip seal testing fixture provided by this utility model enables the testing of the sealing performance of the tested lip, meets the sealing performance testing requirements of tested lips with different inner diameters and thicknesses, improves the versatility and practicality of the testing fixture, and increases the efficiency of lip sealing performance testing.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A lip seal testing fixture includes an oil seal seat mounted on a shaft sealing testing machine. The oil seal seat has a central hole through which the oil seal shaft passes. The fixture is characterized in that: a pressure head is coaxially mounted on the oil seal seat, a bottom sealing ring is press-fitted into the central hole, the lip to be tested is placed in the central hole, the pressure head extends into the central hole and presses the lip to be tested onto the bottom sealing ring, the oil seal shaft is separated from the pressure head and the bottom sealing ring and does not contact them, and the oil seal shaft is press-fitted with the lip to be tested to seal the central hole.

[0006] Preferably, the pressure head consists of a pressure cylinder extending into a central hole and an annular plate integrally formed on the top of the pressure cylinder. The annular plate is fixed to the oil seal seat by bolts, and a spring washer is placed between the annular plate and the oil seal seat, with the spring washer fitted onto the bolt.

[0007] Preferably, the bottom of the central hole has an integrally formed annular positioning flange that protrudes inward, and the bottom sealing ring abuts against the annular positioning flange. The inner diameter of the annular positioning flange is greater than or equal to the inner diameter of the bottom sealing ring.

[0008] Preferably, it also includes a hard gasket ring disposed in the central hole and in clearance fit with the oil seal shaft. There are two lip pieces being tested, namely a main lip piece and a secondary lip piece with an inner diameter larger than the main lip piece. The main lip piece is placed on the bottom sealing ring, and the secondary lip piece is located on the upper layer of the main lip piece. The hard gasket ring is sandwiched between the main and secondary lip pieces and between the pressure head and the secondary lip piece.

[0009] Preferably, the thickness of the rigid pad ring is greater than the thickness of the lip being tested.

[0010] The beneficial effects of this utility model are: This utility model discloses a lip seal testing fixture. The oil seal seat is mounted on a shaft sealing testing machine. A pressure head is coaxially mounted on the oil seal seat. A bottom sealing ring is press-fitted into the center hole of the oil seal seat. The pressure head extends into the center hole and presses the lip to be tested onto the bottom sealing ring. The bottom sealing ring prevents oil leakage along the hole wall of the center hole during the test. The oil seal shaft, with an interference fit to the lip to be tested, passes through the center hole and extends into the shaft sealing testing machine. The lip to be tested, in conjunction with the oil seal shaft, seals the center hole. During the test, the oil seal shaft is rotated, and the shaft sealing test... The pressure of the lubricating oil during the test forms a dynamic seal between the tested lip and the oil seal shaft. The presence of oil leakage between the tested lip and the oil seal shaft is observed, thus enabling the testing of the sealing performance of the tested lip. Test lips of different thicknesses and inner diameters can be set between the pressure head and the bottom sealing ring. Oil seal shafts of different outer diameters can be selected according to the preset interference fit of the tested lip, meeting the sealing performance testing requirements for tested lips of different inner diameters and thicknesses. This improves the versatility and practicality of the testing fixture and increases the efficiency of lip sealing performance testing. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the lip piece being tested mounted on the lip-shaped oil seal lip piece testing fixture of this utility model.

[0012] Figure 2 This is a schematic diagram showing the oil seal shaft passing through the central hole and the lip being tested with an interference fit.

[0013] Figure 3 for Figure 1 A magnified view of a portion of the image. Detailed Implementation

[0014] The following is combined with Figures 1-3 The embodiments of this utility model will be described in detail below.

[0015] A lip seal testing fixture includes an oil seal seat 1 mounted on a shaft sealing testing machine. The center of the oil seal seat 1 has a central hole 11 through which an oil seal shaft 2 passes. The fixture is characterized in that: a pressure head 3 is coaxially mounted on the oil seal seat 1, a bottom sealing ring 4 is press-fitted into the central hole 11, and the lip to be tested 100 is placed in the central hole 11. The pressure head 3 extends into the central hole 11 and presses the lip to be tested 100 onto the bottom sealing ring 4. The oil seal shaft 2 is separated from the pressure head 3 and the bottom sealing ring 4 and does not contact them. It is press-fitted with the lip to be tested 100 to seal the central hole 11.

[0016] The lip seal testing fixture described above has an oil seal seat 1 mounted on a shaft sealing testing machine. A pressure head 3 is coaxially mounted on the oil seal seat 1. A bottom sealing ring 4 is press-fitted into the center hole 11 of the oil seal seat 1. The pressure head 3 extends into the center hole 11 and presses the lip 100 to be tested onto the bottom sealing ring 4. The bottom sealing ring 4 prevents oil leakage along the hole wall of the center hole during the test. The oil seal shaft 2, with an interference fit to the lip 100 to be tested, passes through the center hole 11 and extends into the shaft sealing testing machine. The lip 100 to be tested and the oil seal shaft 2 cooperate to seal the center hole 11. During the test, the oil seal shaft 2 is rotated and the pressure head is increased. The pressure of the lubricating oil in the shaft sealing test machine forms a dynamic seal between the tested lip 100 and the oil seal shaft 2. The presence of oil leakage between the tested lip 100 and the oil seal shaft 2 is observed, thus realizing the sealing performance test of the tested lip. Different thicknesses and inner diameters of tested lip 100 can be set between the pressure head 3 and the bottom sealing ring 4. Different outer diameters of oil seal shaft 2 can be selected according to the preset interference of the tested lip 100 to meet the sealing performance test requirements of tested lips with different inner diameters and thicknesses, improve the versatility and practicality of the test fixture, and improve the efficiency of lip sealing performance test.

[0017] The pressure head 3 consists of a pressure cylinder 31 extending into the central hole 11 and an annular plate 32 integrally formed on the top of the pressure cylinder 31. The annular plate 32 is fixed to the oil seal seat 1 by bolts 33. A spring washer 34 is placed between the annular plate 32 and the oil seal seat 1, and the spring washer 34 is fitted onto the bolts 33. The pressure head 3 is fixed to the oil seal seat 1 by bolts 33, which is convenient and simple to disassemble, making it easy to disassemble the pressure head to replace different test lip plates. The pressure cylinder 31 extends into the central hole 11 to press the test lip plate 100 tightly. The spring washer 34 forms an elastic pressure of the pressure head 3 on the test lip plate 11, preventing the pressure of the pressure head 3 from being too high and damaging the test lip plate 11, thus improving the assembly safety of the test fixture.

[0018] The central hole 11 has an integrally formed an inwardly protruding annular positioning flange at its bottom. The bottom sealing ring 4 rests against the annular positioning flange 12, and the inner diameter of the annular positioning flange 12 is greater than or equal to the inner diameter of the bottom sealing ring 4. The annular positioning flange 12 forms an axial position for the bottom sealing ring 4 in the central hole 11. The bottom sealing ring 4 is inserted into the central hole 11 with an interference fit. When the bottom sealing ring 4 abuts against the annular positioning flange 12, it indicates that the bottom sealing ring 4 is press-fitted in place. The inner diameter of the annular positioning flange 12 is greater than or equal to the inner diameter of the bottom sealing ring 4, which ensures effective support for the bottom sealing ring 4 without interfering with the insertion of the oil seal shaft 2.

[0019] It also includes a hard gasket 5 set in the center hole 11 and clearance fit with the oil seal shaft 2. There are two lip plates 100 being tested, namely a main lip plate 101 and a secondary lip plate 102 with an inner diameter larger than the main lip plate 101. The main lip plate 101 is placed on the bottom sealing ring 4, and the secondary lip plate 102 is located on top of the main lip plate 101. The hard gasket 5 is sandwiched between the main and secondary lip plates and between the pressure head 3 and the secondary lip plate 102. Since most lip seals consist of a main lip and a secondary lip, with the main lip inside and the secondary lip outside, they work together to form a double seal. To test the sealing performance of the main and secondary lips working together, the main and secondary lips are arranged in layers between the pressure head 3 and the bottom sealing ring 4. A hard gasket 5 is used to create sealing gaps between the main and secondary lips and between the secondary lip and the pressure head 3, simulating the structure in a lip seal where the main and secondary lips are separated by a skeleton. The oil seal shaft 2 forms an interference fit with the main and secondary lips respectively. The inner diameter of the secondary lip 102 is larger than that of the main lip 101. The interference fit between the main lip and the oil seal shaft 2 is larger, while the interference fit between the secondary lip 102 and the oil seal shaft 2 is smaller. This is the same as the interference fit setting of the main and secondary lips when installing a lip seal, thus testing the sealing performance of the main and secondary lips working together. The hard gasket 5 is preferably made of stainless steel, which is corrosion-resistant and has a long service life.

[0020] The thickness of the hard gasket 5 is greater than the thickness of the tested lip 100. This ensures that a sealed gap is formed between the main and auxiliary lips, which can store a certain amount of lubricating oil. The sealed gap between the main and auxiliary lips stores the oil leaking from between the main lip and the oil seal shaft 2, making the arrangement of the main and auxiliary lips in the test fixture consistent with the arrangement of the main and auxiliary lips in the lip seal, thereby improving the reliability of the test.

[0021] The technical solutions of the embodiments of this utility model have been fully described above with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A lip seal testing fixture, comprising an oil seal seat mounted on a shaft sealing testing machine, wherein a center hole is formed in the center of the oil seal seat for the oil seal shaft to pass through, characterized in that: The oil seal seat is coaxially mounted with a pressure head, and a bottom sealing ring is press-fitted into the center hole. The lip to be tested is placed in the center hole. The pressure head extends into the center hole and presses the lip to be tested onto the bottom sealing ring. The oil seal shaft is separated from the pressure head and the bottom sealing ring and does not contact them. It is interference-fitted with the lip to be tested to seal the center hole.

2. The lip seal lip testing fixture according to claim 1, characterized in that: The pressure head consists of a pressure cylinder extending into a central hole and an annular plate integrally formed on the top of the pressure cylinder. The annular plate is fixed to the oil seal seat by bolts, and a spring washer is placed between the annular plate and the oil seal seat, with the spring washer fitted onto the bolt.

3. The lip seal lip testing fixture according to claim 1, characterized in that: The bottom of the central hole has an integrally formed annular positioning flange that protrudes inward. The bottom sealing ring abuts against the annular positioning flange, and the inner diameter of the annular positioning flange is greater than or equal to the inner diameter of the bottom sealing ring.

4. The lip seal lip testing fixture according to claim 3, characterized in that: It also includes a hard gasket ring that fits in clearance with the oil seal shaft in the center hole. There are two lip plates being tested: a main lip plate and a secondary lip plate with an inner diameter larger than the main lip plate. The main lip plate is placed on the bottom sealing ring, and the secondary lip plate is located on top of the main lip plate. The hard gasket ring is sandwiched between the main and secondary lip plates and between the pressure head and the secondary lip plate.

5. The lip seal lip testing fixture according to claim 4, characterized in that: The thickness of the hard pad ring is greater than the thickness of the lip being tested.

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