Tool for carrying out airtight test on oil seal

Abstract

The utility model discloses a tool for carrying out an airtight test on an oil seal, which comprises a lower cover and a rotating shaft, the upper end part of the rotating shaft is sleeved with a pressing sleeve, the tool also comprises an outer sleeve arranged at the outer side of the rotating shaft, the bottom of the outer sleeve is connected with the lower cover, the tool also comprises an annular upper cover with a Z-shaped cross section, and the annular upper cover is arranged at the upper part of the outer sleeve and is connected with the outer sleeve. A placing cavity for placing the test oil seal is formed between the annular vertical block and the outer sleeve, and after the test oil seal is placed in the placing cavity, a lip of the test oil seal is in contact with the pressing sleeve, so that the test oil seal, the lower cover, the rotating shaft, the pressing sleeve, the outer sleeve and the annular upper cover jointly form a test cavity; according to the structure, the outer diameters of the multiple sections of outer sleeves are designed to be the same basic size and different tolerances, and therefore interference fit between oil seals of different sizes and a rotating shaft can be achieved on the premise that a small number of parts are replaced; and finally, whether different interference magnitudes can meet airtight requirements or not can be tested.

Description

Technical Field

[0001] The utility model relates to the field of oil seal testing for motors, in particular to a tool for performing airtight testing on oil seals. Background Art

[0002] Currently, the use of oil seals as dynamic seals is a very mature solution. However, due to different materials and structural differences between different manufacturers, the interference fit between the oil seal and the rotating shaft is inconsistent, and the resulting clamping force is quite different. A large clamping force of the oil seal will cause the oil seal to generate high heat during rotational friction, but if the clamping force is small, it cannot meet the function of a seal. Utility Model Content

[0003] The technical problem solved by the utility model is to provide a tool for performing airtightness test on oil seals, which can realize the sealing detection of oil seals of different sizes or the same oil seal with different interference amounts.

[0004] The technical solution adopted by the utility model to solve its technical problem is: a tool for performing airtight testing on an oil seal, characterized in that it includes a lower cover and a rotating shaft arranged on the lower cover, the rotating shaft includes an upper end and a lower end, and the diameter of the upper end is smaller than the lower end so that no step for positioning is formed between the upper end and the lower end, the upper end of the rotating shaft is sleeved with a pressing sleeve, the bottom of the pressing sleeve abuts against the step, and further includes a jacket arranged on the outer side of the rotating shaft, the bottom of the jacket is connected to the lower cover,

[0005] The outer casing further comprises an annular upper cover having a Z-shaped cross section, the annular upper cover comprising an upper annular block, a lower annular block, and an annular vertical block connecting the upper annular block and the lower annular block. The annular upper cover is mounted on the upper portion of the outer casing and is connected to the outer casing, so that a placement cavity for the test oil seal is formed between the annular vertical block and the pressing sleeve. When the test oil seal is placed in the placement cavity, the lip of the test oil seal contacts the pressing sleeve, so that the test oil seal, the lower cover, the rotating shaft, the pressing sleeve, the outer casing, and the annular upper cover together form a test cavity. The outer casing is further provided with an airtight test interface communicating with the test cavity.

[0006] The pressing sleeve is provided with multiple sections from top to bottom, and the outer diameter of each section of the pressing sleeve is different, so that the distance between each section of the pressing sleeve and the annular vertical block is different.

[0007] Furthermore, the outer diameters of the plurality of outer sleeve sections have the same basic size and different tolerances.

[0008] Furthermore, the outer diameters of the multiple sections of outer sleeves have different basic sizes.

[0009] Furthermore, V-shaped grooves are provided between the pressing sleeves of adjacent sections.

[0010] Furthermore, it also includes an oil seal pad for being placed in the placement cavity, and the oil seal pad is used to provide support for the oil seal when it is in different sleeve pressing positions.

[0011] Furthermore, the upper cover, the outer sleeve and the lower cover are fixedly connected by connecting bolts.

[0012] Furthermore, an upper annular protrusion is provided at the upper end of the outer sleeve, a lower annular protrusion is provided at the lower end of the outer sleeve, an upper annular groove is provided on the lower surface of the upper annular block of the annular upper cover for cooperating with the lip of the upper annular protrusion, and a lower annular groove is provided on the lower cover for cooperating with the lip of the lower annular protrusion, the upper annular protrusion is located in the upper annular groove, and the lower annular protrusion is located in the lower annular groove.

[0013] Furthermore, a first O-ring placement groove is provided on the lower cover, a first O-ring is provided in the first O-ring placement groove, and the first O-ring is located between the rotating shaft and the lower cover;

[0014] The upper surface and the lower surface of the outer shell are respectively provided with a second O-ring placement groove, a second O-ring is provided in the second O-ring placement groove, and the second O-ring is located between the outer shell and the upper cover and the lower cover.

[0015] Furthermore, a lifting and carrying hole is provided at the top end of the rotating shaft.

[0016] The beneficial effects of the utility model are:

[0017] 1. This structure designs the outer diameters of multiple sections of outer sleeves to have the same basic size and different tolerances. This allows the interference fit of oil seals of different sizes and the rotating shaft to be achieved by replacing a small number of parts. Ultimately, it is possible to test whether different interference fits can meet the airtightness requirements.

[0018] 2. This structure enables the fixture to detect the sealing properties of oil seals of different sizes by designing the outer diameters of multiple sections of outer sleeves into different basic sizes.

[0019] 3. Through the setting of V-grooves, the adjacent sections of the compression sleeves can be prompted, thereby ensuring the accuracy of the detection.

[0020] 4. This structure is simple and can realize the matching of different oil seal sizes with the rotating shaft, or the matching of the same oil seal size but different materials with the rotating shaft, so as to test whether the matching size meets the airtightness requirements, thereby saving installation difficulty and improving the overall test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a tool for performing airtightness testing on an oil seal according to an embodiment of the present application.

[0022] Figure 2 This is a cross-sectional view of a tool for performing airtightness testing on an oil seal according to an embodiment of the present application during testing at the first gear position.

[0023] Figure 3 This is a cross-sectional view of a tool for performing airtightness testing on an oil seal according to an embodiment of the present application during testing at the second gear position.

[0024] Figure 4 for Figure 3 Enlarged schematic diagram of part I.

[0025] Marked in the figure are: lower cover 1, rotating shaft 2, pressing sleeve 3, outer sleeve 4, annular upper cover 5, upper annular block 501, lower annular block 502, annular vertical block 503, placement cavity 6, test cavity 7, airtight test interface 8, V-shaped groove 9, oil seal gasket 10, connecting bolt 11, upper annular protrusion 12, lower annular protrusion 13, first O-ring 14, second O-ring 15, lifting and handling hole 16, test oil seal 17. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] like Figure 1 As shown, the embodiment of the present application discloses a tool for performing an airtight test on an oil seal, which is characterized by comprising a lower cover 1 and a rotating shaft 2 arranged on the lower cover 1, wherein the rotating shaft 2 comprises an upper end and a lower end, and the diameter of the upper end is smaller than that of the lower end so that no step for positioning is formed between the upper end and the lower end; a pressing sleeve 3 is sleeved on the upper end of the rotating shaft 2, the bottom of the pressing sleeve 3 abuts against the step; and an outer sleeve 4 is arranged on the outside of the rotating shaft 2, the bottom of the outer sleeve 4 is connected to the lower cover 1,

[0028] The apparatus further includes an annular upper cover 5 having a Z-shaped cross-section, the annular upper cover 5 including an upper annular block 501, a lower annular block 502, and an annular vertical block 503 connecting the upper annular block 501 and the lower annular block 502. The annular upper cover 5 is mounted on the upper portion of the outer sleeve 4 and connected to the outer sleeve 4, so that a placement cavity 6 for placing the test oil seal 17 is formed between the annular vertical block 503 and the pressing sleeve 3. When the test oil seal 17 is placed in the placement cavity 6, the lip of the test oil seal 17 contacts the pressing sleeve, so that the test oil seal 17, the lower cover 1, the rotating shaft 2, the pressing sleeve 3, the outer sleeve 4, and the annular upper cover 5 collectively form a test cavity 7. The outer sleeve 4 is also provided with an airtight test interface 8 communicating with the test cavity 7.

[0029] The pressing sleeve 3 is provided with multiple sections from top to bottom, and the outer diameter of each section of the pressing sleeve 3 is different, so that the distance between each section of the pressing sleeve 3 and the annular vertical block 503 is different.

[0030] Specifically, during the test, the test oil seal 17 is placed in the placement cavity 6, so that the test oil seal 17 is stuck between the pressure sleeve 3 and the annular vertical block 503 in the appropriate position under the support of the gasket, and then the external test mechanism is connected to the airtight test interface 8. The external test equipment first ventilates the test cavity 7 and then maintains the pressure. The air pressure data after the pressure maintenance test is used to determine whether there is any leakage at the fitting point between the test oil seal 17 and the pressure sleeve.

[0031] Specifically, when designing the pressing sleeve 3 , there are the following two embodiments.

[0032] Example 1:

[0033] The outer diameters of the multi-segment outer sleeve 4 have the same basic dimensions and different tolerances, that is, the spacings between the multi-segment outer sleeve 4 and the annular vertical block 503 are different but are all within the tolerance range of the basic dimensions required by the tested oil seal 17. When testing, the following can be done: Figure 2 and Figure 3 As shown, the test oil seal 17 is clamped on different sections of the placement cavity 6, so that different interference amounts can be tested to see whether they can meet the airtightness requirements.

[0034] Example 2:

[0035] The outer diameters of the multi-segment outer sleeve 4 have different basic sizes, that is, the spacing between the multi-segment outer sleeve 4 and the annular vertical block 503 meets the testing requirements of test oil seals 17 of different sizes. During the specific test, the test oil seal 17 is clamped in different sections of the placement cavity 6 according to the size of the test oil seal 17, so that oil seals of different specifications can be tested without changing the size of the tooling.

[0036] In this embodiment, V-shaped grooves 9 are provided between adjacent sections of the pressing sleeves 3 .

[0037] Specifically, the setting of the V-groove 9 of this structure can realize the segmented operation of the press sleeve 3, so that the staff can clearly understand the distance between each section in the press sleeve 3 when installing the test oil seal 17, distinguish the different sizes of different sections, and prevent the situation where a test oil seal 17 appears at the same time in the positions of the press sleeve 3 in different sections, resulting in abnormal test data.

[0038] In this embodiment, an oil seal pad 10 is further included for being placed in the placement cavity 6 , and the oil seal pad 10 is used to support the test oil seal 17 .

[0039] Specifically during testing, for example Figure 2As shown, the pressing sleeve 3 is divided into multiple sections. When designed into three sections, they are the first section, the second section and the third section from top to bottom. The length of the oil seal gasket 10 is equal to the length of each section of the pressing sleeve 3. When the pressing sleeve 3 of the first section is used, two oil seal gaskets 10 can be stacked and placed in the placement cavity 6. At this time, only the space for the first section of the pressing sleeve 3 is left in the placement cavity 6, that is, the test oil seal 17 can be clamped between the first section of the pressing sleeve 3 and the annular vertical block 503, and the bottom of the test oil seal 17 can be supported by the oil seal gasket 10. For example Figure 3 As shown, when the second section of the press sleeve 3 is used, an oil seal gasket 10 is stacked and placed in the placement cavity 6. At this time, there is space left in the placement cavity 6 for the first and second sections of the press sleeve 3, that is, the test oil seal 17 can be clamped between the second section of the press sleeve 3 and the annular vertical block 503, and the bottom of the test oil seal 17 can be supported by the oil seal gasket 10.

[0040] In this structure, the provision of the oil seal pad 10 can support the bottom of the test oil seal 17, thereby preventing the test oil seal 17 from sliding downward during the test process, causing inaccurate testing.

[0041] In this embodiment, the upper cover, the outer sleeve 4 and the lower cover 1 are fixedly connected by connecting bolts 11 respectively, and the lower cover 1 and the rotating shaft 2 are connected by connecting bolts 11.

[0042] This connection method can realize the disassembly between the upper cover, the outer sleeve 4 and the lower cover 1, so that the rotating shaft 2, the pressure sleeve 3 and the upper cover 2 can be replaced according to the size detection requirements of different test oil seals 17, so as to realize the airtightness of the cooperation between oil seals of different sizes and the rotating shaft 2.

[0043] In this embodiment, the upper end of the outer sleeve 4 is provided with an upper annular protrusion 12, and the lower end of the outer sleeve 4 is provided with a lower annular protrusion 13. The lower surface of the upper annular block 501 of the annular upper cover 5 is provided with an upper annular groove that cooperates with the lip of the upper annular protrusion 12, and the lower cover 1 is provided with a lower annular groove that cooperates with the lip of the lower annular protrusion 13. The upper annular protrusion 12 is located in the upper annular groove, and the lower annular protrusion 13 is located in the lower annular groove;

[0044] The lower cover 1 is provided with a first O-ring 14 placement groove, in which the first O-ring 14 is placed. The first O-ring 14 is located between the rotating shaft 2 and the lower cover 1;

[0045] Second O-ring 15 placement grooves are respectively provided on the upper and lower surfaces of the outer sleeve 4 , and second O-rings 15 are provided in the second O-ring 15 placement grooves. The second O-rings 15 are located between the outer sleeve 4 and the upper and lower covers 1 .

[0046] Specifically, in the above structure, the upper cover, the outer sleeve 4 and the lower cover 1 can be quickly aligned and installed through the cooperation of the above-mentioned lips. At the same time, the first O-ring 14 and the second O-ring 15 can be set to achieve sealing between the upper cover and the outer sleeve 4, and sealing between the outer sleeve 4 and the lower cover 1, thereby ensuring that during the specific detection work, the detection gas will not leak from the connection between the upper cover, the outer sleeve 4 and the lower cover 1, thereby ensuring the accuracy of the detection.

[0047] In this embodiment, a lifting and carrying hole 16 is provided at the top of the rotating shaft 2 .

[0048] Specifically, in this structure, the provision of the lifting and transporting hole 16 can facilitate the lifting and transport of the rotating shaft 2, thereby enabling the replacement of the rotating shaft 2.

[0049] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tool for performing airtightness testing on an oil seal, characterized by: The invention comprises a lower cover (1) and a rotating shaft (2) arranged on the lower cover (1), wherein the rotating shaft (2) comprises an upper end and a lower end, and the diameter of the upper end is smaller than that of the lower end, so that a step for positioning is formed between the upper end and the lower end, and a pressing sleeve (3) is sleeved on the upper end of the rotating shaft (2), and the bottom of the pressing sleeve (3) abuts against the step, and further comprises an outer sleeve (4) arranged on the outside of the rotating shaft (2), and the bottom of the outer sleeve (4) is connected to the lower cover (1). The annular upper cover (5) is also provided with a Z-shaped cross section. The annular upper cover (5) includes an upper annular block (501), a lower annular block (502), and an annular vertical block (503) connecting the upper annular block (501) and the lower annular block (502). The annular upper cover (5) is installed on the upper part of the outer sleeve (4) and connected to the outer sleeve (4), so that a placement cavity (6) for placing the test oil seal (17) is formed between the annular vertical block (503) and the pressing sleeve (3). When the test oil seal (17) is placed in the placement cavity (6), the lip of the test oil seal (17) contacts the pressing sleeve (3), so that the test oil seal (17), the lower cover (1), the rotating shaft (2), the pressing sleeve (3), the outer sleeve (4), and the annular upper cover (5) together form a test cavity (7). The outer sleeve (4) is also provided with an airtight test interface (8) communicating with the test cavity (7). The pressing sleeve (3) is provided with multiple sections from top to bottom, and the outer diameter of each section of the pressing sleeve (3) is different, so that the distance between each section of the pressing sleeve (3) and the annular vertical block (503) is different.

2. The tool for performing airtightness testing on an oil seal according to claim 1, characterized in that: The outer diameters of the multiple sections of the outer sleeve (4) have the same basic size and different tolerances.

3. The tool for performing airtightness testing on an oil seal according to claim 1, characterized in that: The outer diameters of the multi-section outer sleeve (4) have different basic sizes.

4. The tool for performing airtightness testing on an oil seal according to claim 1, characterized in that: V-shaped grooves (9) are provided between the pressing sleeves (3) of adjacent sections.

5. The tool for performing airtightness testing on an oil seal according to claim 1, characterized in that: It also includes an oil seal pad (10) for placement in the placement cavity (6), and the oil seal pad (10) is used to provide support for the oil seal (17) at different sleeve pressing positions.

6. The tool for performing airtightness testing on an oil seal according to claim 1, characterized in that: The upper cover, outer sleeve (4) and lower cover (1) are fixedly connected by connecting bolts (11).

7. The tool for performing airtightness testing on an oil seal according to claim 1, characterized in that: The upper end of the outer sleeve (4) is provided with an upper annular protrusion (12), and the lower end of the outer sleeve (4) is provided with a lower annular protrusion (13). The lower surface of the upper annular block (501) of the annular upper cover (5) is provided with an upper annular groove that cooperates with the lip of the upper annular protrusion (12). The lower cover (1) is provided with a lower annular groove that cooperates with the lip of the lower annular protrusion (13). The upper annular protrusion (12) is located in the upper annular groove, and the lower annular protrusion (13) is located in the lower annular groove.

8. The tool for performing airtightness testing on an oil seal according to claim 1, characterized in that: The lower cover (1) is provided with a first O-ring (14) placement groove, a first O-ring (14) is provided in the first O-ring (14) placement groove, and the first O-ring (14) is located between the rotating shaft (2) and the lower cover (1); The upper surface and the lower surface of the outer sleeve (4) are respectively provided with second O-ring (15) placement grooves, and the second O-ring (15) is provided in the second O-ring (15) placement groove. The second O-ring (15) is located between the outer sleeve (4) and the upper cover and the lower cover (1).

9. The tool for performing airtightness testing on an oil seal according to claim 1, characterized in that: The top end of the rotating shaft (2) is provided with a lifting and transporting hole (16).

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