Axial fixing structure of mechanical oil seal

Abstract

The utility model belongs to the technical field of mechanical oil seal structures, and particularly relates to an axial fixing structure of a mechanical oil seal, which comprises an assembly hole site arranged on a machine body, a mechanical framework oil seal is arranged in the assembly hole site, and the inner wall surface of the assembly hole site is recessed outwards along the radial direction to form an axial limiting groove. And the outer ring wall of the mechanical framework oil seal extends outwards to form a limiting part which can be inserted into the axial limiting groove. The mechanical framework oil seal is simple in structure, reasonable in design and low in cost, the axial limiting groove is additionally formed in the assembly hole position, and when equipment runs, the mechanical framework oil seal can expand outwards in the radial direction due to high temperature, so that the limiting part can be inserted into the axial limiting groove, and the effect of axially fixing the mechanical framework oil seal is achieved.

Description

Technical field:

[0001] The utility model belongs to the technical field of mechanical oil seal structures, in particular to an axial fixing structure of a mechanical oil seal. Background technology:

[0002] In mechanical structure design, the assembly holes on the casing equipment usually require the mechanical skeleton oil seal to have an appropriate rubber interference fit to ensure the sealing of the casing cavity and prevent the leakage of the engine oil. In some places, such as when the size of the mechanical skeleton oil seal is large or the pressure in the casing cavity is high, it is difficult to firmly fix the mechanical skeleton oil seal on the assembly hole only by rubber interference fit. In serious cases, the mechanical skeleton oil seal is likely to be flushed out by pressure, resulting in sealing failure. Summary of the invention:

[0003] The purpose of the utility model is to provide an axial fixing structure of a mechanical oil seal, which adds an axial limit groove on the assembly hole. When the equipment is running, the mechanical skeleton oil seal will expand radially outward due to the high temperature, so that the limit part can be stably inserted in the axial limit groove, thereby playing a role in axially fixing the mechanical skeleton oil seal.

[0004] The utility model is achieved in this way:

[0005] The axial fixing structure of the mechanical oil seal includes an assembly hole opened on the machine body, in which a mechanical skeleton oil seal is arranged, and the inner wall surface of the assembly hole is radially recessed outward to form an axial limit groove, and the outer ring wall of the mechanical skeleton oil seal extends outward to form a limit portion that can be inserted into the axial limit groove.

[0006] In the above-mentioned axial fixing structure of the mechanical oil seal, the axial limit groove is an annular groove structure, the limit portion is an annular protrusion structure, and there is an expansion space between the outer end of the limit portion and the bottom surface of the axial limit groove for radial expansion of the mechanical skeleton oil seal.

[0007] In the above-mentioned axial fixing structure of the mechanical oil seal, more than one axial limiting groove is provided along the axial direction of the assembly hole, and the number and position of the limiting portion correspond to the axial limiting groove.

[0008] In the above-mentioned axial fixing structure of the mechanical oil seal, the outer port of the assembly hole is radially expanded outward to form a large-diameter opening with a stepped bottom surface, the mechanical skeleton oil seal is sleeved on the large-diameter opening, and there is an assembly spacing between the inner end surface of the mechanical skeleton oil seal and the stepped bottom surface of the large-diameter opening for the axial expansion of the mechanical skeleton oil seal.

[0009] The outstanding advantages of the utility model compared with the prior art are:

[0010] The utility model has a simple structure, reasonable design and low cost. By adding an axial limit groove on the assembly hole, when the equipment is running, the mechanical skeleton oil seal will expand radially outward due to the high temperature, so that the limit part can be inserted into the axial limit groove, thereby playing the role of axially fixing the mechanical skeleton oil seal. Description of the drawings:

[0011] Figure 1 It is the overall assembly structure diagram of the utility model;

[0012] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0013] In the figure: 1. Machine body; 2. Assembly hole; 3. Mechanical skeleton oil seal; 4. Axial limit groove; 5. Limiting part; 6. Large diameter mouth. Specific implementation method:

[0014] The present invention is further described below with reference to specific embodiments. Figure 1 —2:

[0015] The axial fixing structure of the mechanical oil seal includes an assembly hole 2 opened on the body 1, a mechanical skeleton oil seal 3 is arranged in the assembly hole 2, the inner wall surface of the assembly hole 2 is radially recessed outward to form an axial limit groove 4, and the outer ring wall of the mechanical skeleton oil seal 3 extends outward to form a limit portion 5 that can be inserted into the axial limit groove 4.

[0016] The utility model has a simple structure, reasonable design and low cost. By adding an axial limit groove 4 on the assembly hole 2, when the equipment is running, the mechanical skeleton oil seal 3 will expand radially outward due to the high temperature, so that the limit part 5 can be stably inserted in the axial limit groove 4, thereby playing the role of axially fixing the mechanical skeleton oil seal 3.

[0017] Among them, there can be more than two axial limit grooves 4 evenly distributed in the circumferential direction, and in the present embodiment, the specific setting structure of the axial limit groove 4 is: the axial limit groove 4 is an annular groove structure, the limiting portion 5 is an annular protrusion structure, and there is an expansion space between the outer end of the limiting portion 5 and the bottom surface of the axial limit groove 4 for the mechanical skeleton oil seal 3 to expand radially.

[0018] At the same time, in order to improve the connection stability between the mechanical skeleton oil seal 3 and the assembly hole 2, the axial limit groove 4 is provided with more than one along the axial direction of the assembly hole 2, and the number and position of the limit portion 5 correspond to the axial limit groove 4. In this embodiment, the axial limit groove 4 and the limit portion 5 are provided with one.

[0019] In addition, considering that when a high temperature environment is generated during the operation of the equipment, the mechanical skeleton oil seal 3 will also partially expand axially, in order to avoid the axial expansion of the mechanical skeleton oil seal 3, additional axial force is applied to the connecting structure between the limiting portion 5 and the axial limiting groove. Therefore, in this embodiment, the outer port of the assembly hole 2 is radially expanded outward to form a large-diameter mouth 6 with a stepped bottom surface, and the mechanical skeleton oil seal 3 is mounted on the large-diameter mouth 6, and there is an assembly spacing between the inner end surface of the mechanical skeleton oil seal 3 and the stepped bottom surface of the large-diameter mouth 6 for the axial expansion of the mechanical skeleton oil seal 3.

[0020] The above embodiment is only one of the preferred embodiments of the present utility model, and is not intended to limit the scope of implementation of the present utility model. Therefore, any equivalent changes made based on the shape, structure, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. An axial fixing structure of a mechanical oil seal, comprising an assembly hole (2) provided on a machine body (1), wherein a mechanical skeleton oil seal (3) is arranged in the assembly hole (2), characterized in that: The inner wall surface of the assembly hole (2) is recessed radially outward to form an axial limit groove (4), and the outer ring wall of the mechanical skeleton oil seal (3) extends outward to form a limit portion (5) that can be inserted into the axial limit groove (4).

2. The axial fixing structure of the mechanical oil seal according to claim 1, characterized in that: The axial limiting groove (4) is an annular groove structure, the limiting portion (5) is an annular protrusion structure, and there is an expansion space between the outer end of the limiting portion (5) and the bottom surface of the axial limiting groove (4) for radial expansion of the mechanical skeleton oil seal (3).

3. The axial fixing structure of the mechanical oil seal according to claim 1 or 2, characterized in that: More than one axial limiting groove (4) is provided along the axial direction of the assembly hole (2), and the number and position of the limiting portion (5) correspond to the axial limiting groove (4).

4. The axial fixing structure of the mechanical oil seal according to claim 1, characterized in that: The outer end of the assembly hole (2) is expanded radially outward to form a large-diameter opening (6) with a stepped bottom surface, and the mechanical skeleton oil seal (3) is mounted on the large-diameter opening (6), and an assembly spacing for the mechanical skeleton oil seal (3) to expand axially exists between the inner end surface of the mechanical skeleton oil seal (3) and the stepped bottom surface of the large-diameter opening (6).

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