CN221723403U - An oil seal with double-layer sealing structure - Google Patents

Abstract

The utility model provides an oil seal with a double-layer sealing structure, including: an outer sleeve; a sealing assembly is arranged on the inner side of the outer sleeve. The sealing assembly includes a skeleton arranged on the inner side of the outer sleeve, a trimmed surface is arranged on the inner side of the outer sleeve, and a dust lip is arranged on the left side of the outer sleeve. The utility model provides an oil seal with a double-layer sealing structure, in which a pressing piece is pressed on a rubber sleeve body inside the outer sleeve by a spring, driving the rubber sleeve body to move to the right, providing a continuous rightward extrusion force to the fixed ring, and the fixed ring can be continuously and tightly fitted on the rotating ring by the setting of the rotating ring. Since the fixed ring can rotate with the shaft, the sealing effect between the fixed ring and the shaft is better than that of a traditional non-rotating oil seal. By setting an annular groove and a plurality of balls, the friction between the fixed ring and the rotating ring can be reduced, and double sealing isolation can be achieved, so that the use effect is better and the service life is longer.

Description

An oil seal with double-layer sealing structure

Technical Field

The utility model relates to the field of oil seals, in particular to an oil seal with a double-layer sealing structure.

Background Art

Oil seal is a commonly used sealing element, usually called rotary shaft lip seal. Its main function is to prevent the leakage of lubricating oil and other required lubricants in mechanical equipment, especially in the sealing part of the rotary shaft, and also to ensure that the parts that need lubrication in the transmission parts are properly isolated from the output parts.

The structure of oil seals is relatively simple, easy to manufacture, and is usually made of a combination of metal products and rubber. They have a light weight, less consumables consumption, good sealing performance and a long service life. Oil seals can adapt to the vibration of the equipment and the eccentricity of the main shaft. During use, it should be ensured that the oil seals and their related accessories and pipelines meet the technical requirements, and an inspection should be carried out before the equipment is started to confirm that the seal is good. If leakage is found during operation, the cause needs to be found and solved. If the problem cannot be solved, it may be necessary to disassemble and reinstall the oil seal and perform a static pressure test to ensure continuous leakage.

All parts that have liquid lubricating oil in the running body box and are connected to the outside need oil seals. Some are made of rubber, some are made of metal, and most are made of steel-reinforced rubber, such as the crankshaft rear oil seal, the front and rear oil seals of the gearbox, the left and right half-shaft oil seals, the main reducer front oil seal, the air compressor crankshaft oil seal, etc. Application number: CN202321074258.7, providing a sealing oil seal, which is easy to assemble and disassemble, easy to repair and maintain through the setting of the external mud and water resistance component and the internal mud and water resistance component, and the interference fit prevents radial and axial deviations from occurring, thereby ensuring the sealing performance. However, when the device is in use, the mud and water resistance wing at the bottom is in direct contact with the bottom shaft, which will generate a large friction torque when the shaft rotates, thereby generating a lot of heat, which will accelerate the aging of the oil seal at the least, and directly cause the shaft to be unable to rotate at the worst.

Therefore, it is necessary to provide an oil seal with a double-layer sealing structure to solve the above technical problems.

Utility Model Content

The utility model provides an oil seal with a double-layer sealing structure, which solves the problem in the related art that some existing oil seals are not convenient for reducing the torque between the oil seal and the shaft when in use, and have a short sealing effect and service life.

In order to solve the above technical problems, the utility model provides an oil seal with a double-layer sealing structure, comprising: an outer sleeve; a sealing assembly is arranged on the inner side of the outer sleeve.

The sealing assembly includes a frame arranged on the inner side of the outer sleeve, a trimmed surface is arranged on the inner side of the outer sleeve, a dust lip is arranged on the left side of the outer sleeve, and a disc spring for pressing the outer sleeve is arranged on the inner side of the outer sleeve and above the trimmed surface.

Preferably, an auxiliary belt is provided on the inner side of the outer sleeve and on the side of the trimmed surface opposite to the dust lip.

Preferably, the sealing assembly also includes a spring arranged on the inner side of the outer sleeve and located above the disc spring, a pressing piece is arranged at the right end of the spring, and a fixing ring is arranged on the right side of the outer sleeve and located on the right side of the pressing piece.

Preferably, a rotating ring is tightly fitted on the right side of the fixed ring, and the rotating ring rotates with the rotation of the shaft. An annular groove is provided on the side of the fixed ring opposite to the rotating ring, and a plurality of balls are arranged on the inner side of the annular groove.

Preferably, an auxiliary part for quick installation is arranged on the left side of the outer sleeve, and an auxiliary installation groove for matching with the auxiliary part is also opened on the left side of the outer sleeve.

Preferably, two grooves are arranged on the inner side of the dust lip, and the inner walls of the two grooves are coated with solid lubricating oil.

Compared with the related art, the oil seal with a double-layer sealing structure provided by the utility model has the following beneficial effects:

The utility model provides an oil seal with a double-layer sealing structure, in which a pressing piece is pressed against a rubber sleeve body inside an outer sleeve by a spring, so as to drive the rubber sleeve body to move rightward, and provide a continuous rightward extrusion force to a fixed ring, and the fixed ring can be continuously and tightly fitted to the rotating ring by the arrangement of a rotating ring, and because the fixed ring can rotate with the shaft, the sealing effect between the fixed ring and the shaft is better than that of a traditional non-rotating oil seal, and the friction between the fixed ring and the rotating ring can be reduced by the arrangement of an annular groove and a plurality of balls, and double sealing isolation can be achieved, so that the use effect is better and the service life is longer.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a preferred embodiment of an oil seal with a double-layer sealing structure provided by the utility model;

FIG2 is a schematic structural diagram of a cross-sectional view of the outer sleeve shown in FIG1 ;

FIG3 is an enlarged schematic diagram of the structure of area A shown in FIG2 ;

FIG4 is a schematic structural diagram of a left side cross-sectional view of the outer sleeve shown in FIG1 ;

FIG. 5 is an enlarged schematic diagram of the structure of region B shown in FIG. 4 .

Numbers in the figure: 1. Outer sleeve; 2. Sealing assembly; 21. Frame; 22. Cutting surface; 23. Dust lip; 24. Coil spring; 25. Auxiliary belt; 26. Spring; 27. Pressing piece; 28. Fixed ring; 29. Rotating ring; 3. Annular groove; 4. Ball; 5. Auxiliary piece; 6. Mounting groove; 7. Groove.

DETAILED DESCRIPTION

The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

Please refer to Figures 1, 2, 3, 4 and 5, wherein Figure 1 is a structural schematic diagram of a preferred embodiment of an oil seal with a double-layer sealing structure provided by the utility model; Figure 2 is a structural schematic diagram of a cross-sectional view of the outer shaft sleeve shown in Figure 1; Figure 3 is an enlarged schematic diagram of the structure of area A shown in Figure 2; Figure 4 is a structural schematic diagram of a left-side cross-sectional view of the outer shaft sleeve shown in Figure 1; Figure 5 is an enlarged schematic diagram of the structure of area B shown in Figure 4, an oil seal with a double-layer sealing structure, comprising: an outer shaft sleeve 1; a sealing assembly 2 is arranged on the inner side of the outer shaft sleeve 1.

The sealing assembly 2 includes a frame 21 arranged on the inner side of the outer sleeve 1, a trimmed surface 22 is arranged on the inner side of the outer sleeve 1, a dust lip 23 is arranged on the left side of the outer sleeve 1, and a disc spring 24 for pressing the trimmed surface 22 is arranged on the inner side of the outer sleeve 1 and above the trimmed surface 22.

The trimmed surface 22 is used to isolate the inside from the outside to prevent leakage of lubricating oil, and the coil spring 24 is provided to squeeze the rubber sleeve inside the outer sleeve 1 to achieve a better isolation effect.

An auxiliary belt 25 is provided on the inner side of the outer sleeve 1 and on the side opposite to the trimmed surface 22 and the dust lip 23 .

By providing the auxiliary belt 25, when the trimmed surface 22 fails, its isolation effect can be temporarily replaced, thereby prolonging the use effect of the device.

The sealing assembly 2 also includes a spring 26 arranged inside the outer sleeve 1 and above the disc spring 24 . A pressing piece 27 is arranged at the right end of the spring 26 . A fixing ring 28 is arranged on the right side of the outer sleeve 1 and on the right side of the pressing piece 27 .

The pressing piece 27 is pressed against the rubber sleeve inside the outer sleeve 1 by the spring 26, driving the rubber sleeve to move to the right, providing a continuous rightward extrusion force to the fixed ring 28. By setting the rotating ring 29, the fixed ring 28 can continuously fit tightly on the rotating ring 29, realizing double sealing isolation. Compared with traditional oil seals, the use effect is better.

A rotating ring 29 is tightly fitted on the right side of the fixed ring 28 , and the rotating ring 29 rotates with the rotation of the shaft. An annular groove 3 is provided on the side of the fixed ring 28 opposite to the rotating ring 29 , and a plurality of balls 4 are arranged inside the annular groove 3 .

Since the fixed ring 28 can rotate with the shaft, the sealing effect between the fixed ring 28 and the rotating ring 29 is better than that of a traditional non-rotating oil seal. The friction between the fixed ring 28 and the rotating ring 29 can be reduced by providing the annular groove 3 and a plurality of balls 4.

An auxiliary component 5 for quick installation is arranged on the left side of the outer sleeve 1 , and an auxiliary installation groove 6 for matching with the auxiliary component 5 is also opened on the left side of the outer sleeve 1 .

The auxiliary part 5 and the installation groove 6 make it more convenient for personnel to install the oil seal.

Two grooves 7 are arranged on the inner side of the dust lip 23 , and the inner walls of the two grooves 7 are coated with solid lubricating oil.

By setting the groove 7 and the solid lubricant, when the shaft rotates and generates greater friction, heat will be generated, and this heat will melt a part of the solid lubricant. The lubricant lubricates the dust lip 23 and the shaft to prevent dry grinding and extend the service life.

The working principle of an oil seal with a double-layer sealing structure provided by the utility model is as follows:

Step 1: When in use, the trimmed surface 22 is used to isolate the inside from the outside to prevent leakage of lubricating oil, and the coil spring 24 is used to squeeze the rubber sleeve inside the outer sleeve 1 to achieve a better isolation effect. The auxiliary belt 25 is used to temporarily replace the isolation effect of the trimmed surface 22 when it fails.

Step 2: The pressing piece 27 is pressed on the rubber sleeve inside the outer sleeve 1 by the spring 26, driving the rubber sleeve to move rightward, providing a continuous rightward extrusion force to the fixed ring 28. By setting the rotating ring 29, the fixed ring 28 can be continuously and tightly fitted on the rotating ring 29. Since the fixed ring 28 can rotate with the shaft, the sealing effect between the fixed ring 28 and the rotating ring 29 is better than that of the traditional non-rotating oil seal. By setting the annular groove 3 and a plurality of balls 4, the friction between the fixed ring 28 and the rotating ring 29 can be reduced, and double sealing isolation can be achieved, and the use effect is better;

Step 3: Through the arrangement of the groove 7 and the solid lubricant, when the shaft rotates and generates greater friction, heat will be generated, and this heat will melt a portion of the solid lubricant. The lubricant lubricates the dust lip 23 and the shaft to prevent dry grinding and extend the service life.

Compared with the related art, the oil seal with a double-layer sealing structure provided by the utility model has the following beneficial effects:

The pressing piece 27 is pressed against the rubber sleeve inside the outer sleeve 1 by the spring 26, driving the rubber sleeve to move to the right, providing a continuous rightward extrusion force to the fixed ring 28. By setting the rotating ring 29, the fixed ring 28 can be continuously and tightly fitted on the rotating ring 29. Since the fixed ring 28 can rotate with the shaft, the sealing effect between the fixed ring 28 and the shaft is better than that of a traditional non-rotating oil seal. By setting the annular groove 3 and a plurality of balls 4, the friction between the fixed ring 28 and the rotating ring 29 can be reduced, and double sealing isolation can be achieved, resulting in better use effect and longer service life.

The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims (6)

1. An oil seal with a double-layer sealing structure, characterized in that it comprises: an outer sleeve (1); a sealing assembly (2) is arranged on the inner side of the outer sleeve (1); The sealing assembly (2) comprises a frame (21) arranged on the inner side of the outer sleeve (1), a trimmed surface (22) is arranged on the inner side of the outer sleeve (1), a dust lip (23) is arranged on the left side of the outer sleeve (1), and a disc spring (24) for pressing the outer sleeve (1) is arranged on the inner side of the outer sleeve (1) and above the trimmed surface (22). 2. An oil seal with a double-layer sealing structure according to claim 1, characterized in that an auxiliary belt (25) is provided on the inner side of the outer sleeve (1) and on the side opposite to the trimmed surface (22) and the dust lip (23). 3. An oil seal with a double-layer sealing structure according to claim 1, characterized in that the sealing assembly (2) also includes a spring (26) arranged on the inner side of the outer sleeve (1) and located above the disc spring (24), a pressing piece (27) is arranged at the right end of the spring (26), and a fixing ring (28) is arranged on the right side of the outer sleeve (1) and on the right side of the pressing piece (27). 4. An oil seal with a double-layer sealing structure according to claim 3, characterized in that a rotating ring (29) is tightly fitted on the right side of the fixed ring (28), and the rotating ring (29) rotates with the rotation of the shaft, and an annular groove (3) is provided on the side of the fixed ring (28) opposite to the rotating ring (29), and a plurality of balls (4) are arranged on the inner side of the annular groove (3). 5. An oil seal with a double-layer sealing structure according to claim 1, characterized in that an auxiliary part (5) for quick installation is provided on the left side of the outer sleeve (1), and an auxiliary installation groove (6) for matching the auxiliary part (5) is also opened on the left side of the outer sleeve (1). 6. An oil seal with a double-layer sealing structure according to claim 1, characterized in that two grooves (7) are provided on the inner side of the dust lip (23), and the inner walls of the two grooves (7) are coated with solid lubricating oil.