A tool for detecting oil seal airtightness test

Abstract

The present invention discloses a tool for detecting the airtightness of an oil seal, comprising a base, a cover plate, a plurality of first threaded holes and an external leakage meter hole provided on the base, a first boss provided on the base, a first recess formed between the first boss and the base, a central threaded hole provided in the first recess, a plurality of first through holes provided on the cover plate, the first through holes corresponding to the first threaded holes, a second recess and a first step hole provided at the center of the cover plate, the first step hole being located in the recess of the second recess, the second recess cavity mouth being concave-convexly matched with the first boss, and also comprising a shaft for loading and unloading the oil seal to be tested, one end of the shaft being matched with the central threaded hole, and the other end of the shaft also being matched with the first step hole. The present invention has a simple structure, is easy to operate and carry, and is very suitable for airtightness detection work in the oil seal production process.

Description

Technical Field

[0001] The invention relates to the technical field of oil seal detection, and in particular to a tooling for detecting the air tightness of an oil seal. Background Art

[0002] Oil seals are commonly used to seal shaft holes for axial and rotational motion. In passenger cars, whether they are new energy vehicles or traditional fuel vehicles, oil seals for high-pressure and low-pressure environments are often used. As a low-pressure oil seal, it is often used to isolate the internal oil from the outside of the case. If the oil seal is not pressure-resistant enough and leaks, it will cause oil stains on the outside of the gearbox, affecting the appearance. In severe cases, it will lead to poor lubrication of the internal parts of the gearbox, aggravated wear and temperature rise, and cause severe consequences. As a high-pressure oil seal, it is often used to seal the internal high-pressure fork shaft hole. If it leaks, it will cause abnormal shifting function.

[0003] However, the existing technology lacks tooling for the leakage or pressure drop of the oil seal under a specific pressure, and is unable to ensure the pressure resistance of the oil seal. Summary of the invention

[0004] In view of the gaps in the prior art, the present invention provides a tool for detecting the airtightness test of an oil seal. The tool has a simple structure, is easy to operate and carry, and can accurately test the pressure resistance performance of the oil seal.

[0005] The technical solutions to the above technical problems are as follows:

[0006] A tool for detecting the air tightness of an oil seal, comprising a base, a cover plate, a plurality of first threaded holes and an external leakage meter hole provided on the base, a first boss provided on the base, a first recess formed between the first boss and the base, a central threaded hole provided in the first recess, a plurality of first through holes provided on the cover plate, the first through holes corresponding to the first threaded holes, a second recess and a first step hole provided at the center of the cover plate, the first step hole being located in the recess of the second recess, the second recess cavity mouth being concave-convex matched with the first boss, and further comprising;

[0007] A shaft used for loading and unloading the oil seal to be tested, wherein one end of the shaft is matched with the central threaded hole, and the other end of the shaft can also be matched with the first step hole.

[0008] Furthermore, the external leakage instrument hole is communicated with the first recess.

[0009] Furthermore, the shaft has a threaded section, a chamfered section, an oil seal inner lip mating surface, an oil seal limit platform, and a shaft top head. The cover plate also has a tapered hole, an oil seal mating hole, an air getter groove, and an exhaust groove. The threaded section cooperates with the first threaded hole, the chamfered section abuts against the first recess, the oil seal inner lip mating surface abuts against the oil seal to be measured, the oil seal limit platform cooperates with the oil seal to be measured, the shaft top head cooperates with the tapered hole, the oil seal mating hole cooperates with the oil seal to be measured, the air getter groove cooperates with the oil seal to be measured / shaft top head, and the exhaust groove cooperates with the shaft top head.

[0010] The present invention provides a tool for detecting the air tightness of an oil seal. Firstly, the shaft not only has the function of connecting the base and the cover plate, but also has the function of replacing the actual shaft and the function of disassembling and assembling the oil seal. Secondly, the base cooperates with the cover plate to form a cavity for accommodating the oil seal. Before performing an air tightness test, the leakage meter is first connected to the external leakage meter hole on the base, and then the oil seal to be tested is placed at the first step hole on the base, and then the end face of the shaft that cooperates with the first step hole is used to slowly press the oil seal until the shaft presses against the end face of the base and cannot move into the base. If the shaft moves, it means that the oil seal has been installed between the base and the cover plate. Take out the shaft, align the end of the shaft that matches the center threaded hole with the first step hole of the cover plate, then extend the shaft into the cover plate and tighten the shaft on the center threaded hole. At this time, the oil seal to be tested is pressed between the base and the cover plate, and then test it. After the test is completed, screw out the shaft, separate the base from the cover plate, and then insert the other end of the shaft into the first step hole of the cover plate from the second notch end. When the shaft and the end face of the second notch hit each other, it means that the oil seal to be tested has been ejected.

[0011] The invention has the characteristics of simple structure, convenient operation and carrying, and one shaft has multiple uses. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the front view of the present invention;

[0013] Figure 2 is an enlarged view of the axis;

[0014] Figure 3 This is an enlarged view of the cover.

[0015] Markings in the attached drawings:

[0016] Base 3, first threaded hole 3a, first boss 3b, first recess 3c, center threaded hole 3d, external leakage meter hole 3e, cover plate 4, second recess 4-1, tapered hole 4-2, oil seal matching hole 4-3, air release groove 4-5, exhaust groove 4-6, first through hole 4a, first step hole 4c, shaft 5, threaded section 5-1, chamfered section 5-2, oil seal inner lip matching surface 5-3, oil seal limit platform 5-4, shaft top head 5-5. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with specific implementations and drawings.

[0018] like Figure 1 As shown, a tooling for detecting the air tightness of an oil seal comprises a base 3, a cover plate 4, the base 3 is provided with a plurality of first threaded holes 3a and an external leakage meter hole 3e, the base 3 is provided with a first boss 3b, a first recess 3c is formed between the first boss 3b and the base 3, a central threaded hole 3d is provided in the first recess 3c, the cover plate 4 is provided with a plurality of first through holes 4a, the first through holes 4a correspond to the first threaded holes 3a, the center portion of the cover plate 4 is provided with a second recess 4-1 and a first step hole 4c, the first step hole 4c is located in the recess of the second recess 4-1, the second recess cavity 4-1 is concave-convexly matched with the first boss 3b, and also comprises;

[0019] A shaft 5 is used for loading and unloading the oil seal to be tested, one end of the shaft 5 is matched with the central threaded hole 3d, and the other end of the shaft 5 can also be matched with the first step hole 4c.

[0020] In this embodiment, the cover plate 4 and the base 3 are preferably connected by bolts. The bolts pass through the entire cover plate 4 from the first through hole 4a, and then are tightened in the first threaded hole 3a of the base 3 to connect the base 3 and the cover plate 4. Before connection, it must be ensured that the first boss 3b is completely located in the second recess 4-1.

[0021] like Figure 2 and Figure 3 As shown, the shaft 5 has a threaded section 5-1, a chamfered section 5-2, an oil seal inner lip mating surface 5-3, an oil seal limiting platform 5-4, and a shaft top head 5-5. The cover plate 4 also has a tapered hole 4-2, an oil seal mating hole 4-3, an air getter groove 4-5, and an exhaust groove 4-6. The threaded section 5-1 is matched with the first threaded hole 3a, the chamfered section 5-2 is pressed against the first recess 3c, the oil seal inner lip mating surface 5-3 is pressed against the oil seal to be measured, the oil seal limiting platform 5-4 is matched with the oil seal to be measured, the shaft top head 5-5 is matched with the tapered hole 4-2, the oil seal mating hole 4-3 is matched with the oil seal to be measured, the air getter groove 4-5 is matched with the oil seal to be measured / shaft top head 5-5, and the exhaust groove 4-6 is matched with the shaft top head 5-5.

[0022] In this embodiment, before the airtightness test of the oil seal, firstly, the air source is connected to the tooling and the leak meter is connected to the base 3 through the external leak meter hole 3e, and then the oil seal to be tested is placed on the above-mentioned tapered hole 4-2 (at this time, the cover plate 3 should be placed with the mouth of the second recess 4-1 facing upward), and then the shaft head 5-5 end of the shaft 5 is used to press the oil seal located on the tapered hole 4-2 until the oil seal limit platform 5-4 of the shaft 5 contacts the end surface of the cover plate 4 and manual pressing cannot be continued. At this time, it means that the oil seal to be tested has been installed. Secondly, the shaft 5 is pulled out from the cover plate 3. Then put the sealing ring into the first recess 3c of the base 3, and then buckle the cover plate 4 on the first boss 3b of the base 3 (at this time, the cover plate 4 and the base 3 are matched with each other, and the initial positioning of the cover plate 4 and the base 3 is completed), and then use bolts that meet the specifications to pass through the first through hole 4a on the cover plate 4, and screw the bolts into the first threaded holes 3a on the base to fix the cover plate 4 and the base, thereby ensuring that the sealing ring is compacted. Finally, insert the threaded section 5-1 of the shaft 5 from the top of the cover plate 4 until the threaded section 5-1 is screwed into the above-mentioned central threaded hole 3d, and then turn on the air source to perform an airtightness test on the oil seal.

[0023] In this embodiment, after the test is completed, the gas on the circumferential surface of the oil seal is first discharged through the exhaust hole on the cover plate 3 (not shown in the drawings), and then the shaft 5 is unscrewed and removed from the central threaded hole 3d, and then the shaft 5 is turned over, and the shaft head 5-5 of the shaft 5 is inserted into the above-mentioned degassing groove 5-4, and pressure is applied downward. At this time, the oil seal will move along the oil seal matching hole 4-3 toward the second recess 4-1, and then the oil seal will fall from the tapered hole 4-2 into the first recess 3c of the base 3, thereby completing the disassembly.

[0024] In this embodiment, the oil seal under test cooperates with the oil seal inner lip mating surface 5-3 of the shaft. The shaft 5 is equivalent to the actual shaft in the machine at this time. The air source is used to test the air tightness of the oil seal to achieve the purpose of simulating whether the oil seal is leaking.

[0025] Finally, it should be noted that the above-described implementation scheme is only a preferred embodiment of the present invention to illustrate the technical solution of the present invention, and does not limit it, let alone limit the protection scope of the present invention; although the invention is described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the protection scope of the claims.

Claims

1. A tool for detecting the air tightness of an oil seal, comprising a base (3), a cover plate (4), the base (3) being provided with a plurality of first threaded holes (3a) and an external leakage meter hole (3e), the base (3) being provided with a first boss (3b), a first recess (3c) being formed between the first boss (3b) and the base (3), a central threaded hole (3d) being provided in the first recess (3c), the cover plate (4) being provided with a plurality of first through holes (4a), the first through holes (4a) corresponding to the first threaded holes (3a), a second recess (4-1) and a first step hole (4c) being provided at the center of the cover plate (4), the first step hole (4c) being located in the recess of the second recess (4-1), the second recess cavity (4-1) being matched with the first boss (3b) in a concave-convex manner, and characterized in that: Also includes; A shaft (5) for mounting and dismounting the oil seal to be tested, wherein one end of the shaft (5) cooperates with the central threaded hole (3d), and the other end of the shaft (5) can also cooperate with the first step hole (4c); The shaft (5) comprises a threaded section (5-1), a chamfered section (5-2), an oil seal inner lip mating surface (5-3), an oil seal limiting platform (5-4), and a shaft top head (5-5); the cover plate (4) further comprises a tapered hole (4-2), an oil seal mating hole (4-3), a degassing groove (4-5), and an exhaust groove (4-6); the threaded section (5-1) is mated with the central threaded hole (3d); the chamfered section (5-2) is abutted against the first recess (3c); the oil seal inner lip mating surface (5-3) is abutted against the oil seal to be tested; the oil seal limiting platform (5-4) is mated with the oil seal to be tested; the shaft top head (5-5) is mated with the tapered hole (4-2); the oil seal mating hole (4-3) is mated with the oil seal to be tested; the degassing groove (4-5) is mated with the oil seal to be tested / the shaft top head (5-5); and the exhaust groove (4-6) is mated with the shaft top head (5-5).

2. The tooling for detecting the air tightness of oil seals according to claim 1, characterized in that: The external leakage meter hole (3e) is in communication with the first recess (3c).

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