Oil seal for gearbox

Abstract

The utility model belongs to the technical field of oil seals, and discloses an oil seal for a gearbox, which comprises an outer ring plate, a bearing is fixedly mounted on the inner ring of the outer ring plate, an outer sealing element is mounted at the inner ring of the bearing, and an inner sealing element is mounted at the inner ring of the outer sealing element; the outer sealing piece comprises a hard ring installed at the rotating end of the bearing, a circle of U-shaped elastic pieces are arranged in the inner ring of the hard ring, and the closed ends of the circle of U-shaped elastic pieces are connected with the outer ring of the inner sealing piece. According to the oil seal for the gearbox, the shaft extrudes the inner sealing piece, extrusion force can be transmitted to the outer sealing piece after the inner sealing piece deforms, when the outer sealing piece is subjected to the extrusion force, the U-shaped elastic piece is extruded, the two corner ends of the U-shaped elastic piece slide towards the two sides, and after the oil seal is fixed, under the elastic reset effect of the U-shaped elastic piece, the two corner ends of the U-shaped elastic piece slide towards the two sides. When the inner sealing piece is pressed against the shaft, the inner sealing piece abuts against the shaft, the wall face of the inner sealing piece makes full contact with the outer wall face of the shaft and is tightly attached to the outer wall face of the shaft, and the situation of oil leakage is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of oil seals, in particular to an oil seal for a gearbox. Background Art

[0002] The seal is a lip seal ring for rotating shafts. It is a typical basic mechanical component and is widely used in mechanical equipment to prevent the leakage of lubricating media in mechanical devices and ensure the normal operation of mechanical devices. As a commonly used transmission device, the lubrication and sealing of the shaft end of the gearbox is particularly important. The gearbox includes an outer seat and multiple rotating shafts. In order to form a seal between the outer seat and the rotating shaft, an oil seal is usually required between the outer seat and the rotating shaft.

[0003] The prior art, such as publication number: CN217234335U, discloses an oil seal for a gearbox, which includes an inner seal body, an outer seal body and a frame; wherein the inner seal body includes an axial ring portion extending in the axial direction, a radial portion connected to the lower end of the axial ring portion and extending radially inward, and a lip portion connected to the inner circumference of the radial portion. The utility model can improve the convenience of disassembly.

[0004] In summary, the current oil seals still have the following defects during installation and use at the user end:

[0005] During use, the lip body made of rubber material mainly contacts the outer wall of the shaft to achieve sealing of the shaft. However, after long-term use, the lip body ages and its elasticity is low, which will cause the lip body wall to be unable to fit tightly with the outer wall of the shaft. At this time, oil leakage will occur and the service life of the oil seal will be poor. Utility Model Content

[0006] In order to overcome the above-mentioned defects of the prior art, the inventors conducted in-depth research and completed the present utility model after paying a lot of creative work.

[0007] Specifically, the technical problem to be solved by the utility model is: to provide an oil seal for a gearbox, so as to solve the problem that the oil seal currently uses a lip body made of rubber material to contact the outer wall surface of the shaft to achieve sealing of the shaft body. However, after long-term use, the lip body ages and its elasticity is low, which will cause the wall surface of the lip body to be unable to fit tightly with the outer wall surface of the shaft body, and oil leakage will occur at this time, resulting in a technical problem of poor service life of the oil seal.

[0008] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0009] An oil seal for a gearbox, comprising an outer ring plate, the inner ring of the outer ring plate is fixedly mounted with the bearing, the inner ring of the bearing is mounted with the outer seal, and the inner ring of the outer seal is mounted with the inner seal;

[0010] The outer seal comprises a hard ring installed at the rotating end of the bearing, a circle of U-shaped elastic sheets is arranged in the inner ring of the hard ring, and the closed ends of the circle of U-shaped elastic sheets are connected to the outer ring of the inner seal.

[0011] As an improved technical solution, the inner arc edge is arranged at the closed end of the U-shaped spring piece, and the outer arc edges A are arranged outwardly at two corner ends of the U-shaped spring piece.

[0012] As an improved technical solution, the limiting slideway is provided in the middle of the inner ring of the hard ring, the limiting sliders are welded to the two corner ends of the U-shaped spring piece, and the limiting sliders slide inside the limiting slideway.

[0013] As an improved technical solution, the outer arc-shaped edge B is provided at one end of the limit sliding block away from the U-shaped spring piece.

[0014] As an improved technical solution, the inner seal includes a rubber ring, a circle of the gas cavity is opened on the inner side of the rubber ring, the expansion sheet is installed on the inner wall surface of the gas cavity, the expansion sheet blocks the gas cavity, and at the same time, the interior of the gas cavity is filled with gas.

[0015] As an improved technical solution, the upper cover plate is installed at the outer circle of the top of the inner wall of the outer ring plate, and the lower cover plate is installed at the outer circle of the bottom of the inner wall of the outer ring plate, and a one-millimeter shallow groove is provided on the opposite surfaces of the lower cover plate and the upper cover plate.

[0016] After adopting the above technical solution, the beneficial effects of the utility model are:

[0017] 1. In the utility model, the shaft squeezes the inner seal, and the inner seal will transfer the squeezing force to the outer seal after being deformed. When the outer seal is subjected to the squeezing force, the U-shaped spring piece is squeezed, and the two corner ends of the U-shaped spring piece slide to both sides. When the oil seal is fixed, the inner seal will be pushed toward the direction of the shaft under the elastic reset action of the U-shaped spring piece, so that the wall surface of the inner seal and the outer wall surface of the shaft are fully in contact and tightly fitted, which is conducive to avoiding oil leakage.

[0018] 2. In the present invention, a plurality of U-shaped spring pieces are arranged around the outer ring of the inner seal and are more fully and evenly distributed on the outer wall of the inner seal. When the inner seal is resisted, the inner wall of the inner seal is more closely in contact with the outer wall of the shaft.

[0019] 3. In the utility model, when the shaft contacts the inner seal, the expansion sheet will be squeezed relative to it. When the expansion sheet is squeezed, the gas inside the gas cavity is concentrated to flow in the direction of the rubber ring. When the oil seal is installed, the gas gathers inside the gas cavity, and the force of the gas squeezes and expands the expansion sheet outward, so that the wall surface of the expansion sheet fits the outer wall surface of the shaft. The double measure is used to ensure the sealing effect of the oil seal and effectively improve the service life of the oil seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0021] Figure 1 The utility model is a schematic diagram of the overall structure of the oil seal for the gearbox.

[0022] Figure 2 This is a schematic diagram of the overall structure of the oil seal for the gearbox of the utility model (excluding the upper cover plate).

[0023] Figure 3 It is a schematic diagram of the structure of the outer sealing member of the oil seal for the gearbox of the utility model.

[0024] Figure 4 The utility model is a schematic diagram of the U-shaped spring piece structure of the oil seal for the gearbox.

[0025] Figure 5 The utility model is a schematic diagram of the cross-sectional structure of the rubber ring of the oil seal for the gearbox.

[0026] Description of reference numerals:

[0027] 1. Outer ring plate; 2. Upper cover plate; 3. Lower cover plate; 4. Bearing; 5. Inner seal; 51. Rubber ring; 52. Gas chamber; 53. Expansion sheet; 6. Outer seal; 61. Hard ring; 62. Limit slideway; 63. U-shaped spring piece; 64. Inner arc edge; 65. Outer arc edge A; 66. Outer arc edge B; 67. Limit slider. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or a option in which both A and B are satisfied.

[0031] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model. Example 1

[0032] Reference Figure 1-5 , which is the first embodiment of the utility model, provides an oil seal for a gearbox, and the oil seal for a gearbox comprises an outer ring plate 1, a bearing 4 is fixedly mounted on the inner ring of the outer ring plate 1, an outer seal 6 is mounted on the inner ring of the bearing 4, and an inner seal 5 is mounted on the inner ring of the outer seal 6;

[0033] The outer seal 6 includes a hard ring 61 installed at the rotating end of the bearing 4. A circle of U-shaped spring pieces 63 is arranged in the inner ring of the hard ring 61. The closed ends of the circle of U-shaped spring pieces 63 are connected to the outer ring of the inner seal 5. Multiple U-shaped spring pieces 63 are arranged around the outer ring of the inner seal 5. The distribution on the outer wall of the inner seal 5 is more comprehensive and uniform. When the inner seal 5 is resisted, the inner wall of the inner seal 5 is more closely in contact with the outer wall of the shaft.

[0034] An inner arc edge 64 is provided at the closed end of the U-shaped spring piece 63. The setting of the inner arc edge 64 reduces the damage of the U-shaped spring piece 63 to the rubber ring 51 and plays a protective role for the rubber ring 51. On the one hand, the elastic performance of the rubber ring 51 is guaranteed, and on the other hand, the service life of the rubber ring 51 is extended. Outer arc edges A65 are provided on the outward sides of the two corner ends of the U-shaped spring piece 63. The setting of the outer arc edge A65 reduces the friction between the U-shaped spring piece 63 and the hard ring 61.

[0035] A limiting slide 62 is provided in the middle of the inner ring of the hard ring 61, and limiting sliders 67 are welded to the two corner ends of the U-shaped spring piece 63, and the limiting slider 67 slides inside the limiting slide 62. The limiting slider 67 slides inside the limiting slide 62 to limit the position of the U-shaped spring piece 63, thereby avoiding position deviation of the U-shaped spring piece 63 during movement and ensuring the smooth operation of the oil seal.

[0036] An end of the limiting slider 67 away from the U-shaped spring piece 63 is provided with an outer arc-shaped edge B66.

[0037] During use, when the oil seal is used, the oil seal is installed on the gearbox so that the shaft of the gearbox passes through the interior of the inner seal 5;

[0038] When the gearbox shaft passes through the inner seal 5, the shaft squeezes the inner seal 5, and the inner seal 5 is deformed and transmits the squeezing force to the outer seal 6. When the outer seal 6 is subjected to the squeezing force, the U-shaped spring piece 63 is squeezed, and the two corner ends of the U-shaped spring piece 63 slide to both sides. When the oil seal is fixed, the inner seal 5 is pushed toward the direction of the shaft under the elastic reset action of the U-shaped spring piece 63, so that the wall surface of the inner seal 5 is fully in contact with and tightly fits with the outer wall surface of the shaft, which helps to avoid oil leakage. Example 2

[0039] Reference Figure 1-5 , which is the second embodiment of the utility model, and this embodiment is different from the first embodiment in that:

[0040] The inner seal 5 includes a rubber ring 51, and the rubber ring 51 is fixed between the closed ends of a circle of U-shaped spring sheets 63. A circle of gas cavity 52 is opened on the inner side of the rubber ring 51. An expansion sheet 53 is installed on the inner wall surface of the gas cavity 52. ​​The expansion sheet 53 blocks the gas cavity 52. ​​At the same time, the inside of the gas cavity 52 is filled with gas. When the oil seal is installed, the gas gathers inside the gas cavity 52. ​​The force of the gas squeezes and expands the expansion sheet 53 outward, so that the wall surface of the expansion sheet 53 fits the outer wall surface of the shaft. The double measure is used to ensure the sealing effect of the oil seal and effectively improve the service life of the oil seal.

[0041] An upper cover plate 2 is installed at the outer ring of the top of the inner wall of the outer ring plate 1, and a lower cover plate 3 is installed at the outer ring of the bottom of the inner wall of the outer ring plate 1. The opposite surfaces of the lower cover plate 3 and the upper cover plate 2 are provided with a one-millimeter shallow groove to avoid friction between the inner seal 5 and the outer seal 6 and the wall surfaces of the upper cover plate 2 and the lower cover plate 3. The upper cover plate 2 and the lower cover plate 3 are respectively installed on the upper and lower end surfaces of the outer ring plate 1. The upper cover plate 2 and the lower cover plate 3 shield and protect the outer seal 6 to prevent foreign matter from falling into the inner cavity of the outer seal 6.

[0042] During use, when the shaft contacts the inner seal 5, the expansion sheet 53 is squeezed relative to the expansion sheet 53. When the expansion sheet 53 is squeezed, the gas inside the gas cavity 52 is concentrated to flow in the direction of the rubber ring 51. When the oil seal is installed, the gas gathers inside the gas cavity 52. ​​The force of the gas squeezes and expands the expansion sheet 53 outward, so that the wall surface of the expansion sheet 53 fits the outer wall surface of the shaft.

[0043] The remaining structures are the same as those of Example 1.

[0044] It should be understood that the purpose of these embodiments is only to illustrate the utility model and is not intended to limit the protection scope of the utility model. In addition, it should also be understood that after reading the technical content of the utility model, those skilled in the art can make various changes, modifications and / or variations to the utility model, and all of these equivalent forms also fall within the protection scope defined by the claims attached to this application.

Claims

1. An oil seal for a gearbox, comprising an outer ring plate, the inner ring of which is fixedly mounted with a bearing, characterized in that: An outer seal is installed at the inner ring of the bearing, and an inner seal is installed at the inner ring of the outer seal; The outer seal comprises a hard ring installed at the rotating end of the bearing, a circle of U-shaped elastic sheets is arranged in the inner ring of the hard ring, and the closed ends of the circle of the U-shaped elastic sheets are connected to the outer ring of the inner seal.

2. The oil seal for a gearbox according to claim 1, characterized in that: An inner arc edge is arranged at the closed end of the U-shaped spring piece, and outer arc edges A are arranged outwardly at two corner ends of the U-shaped spring piece.

3. The oil seal for a gearbox according to claim 2, characterized in that: A limiting slideway is provided in the middle of the inner ring of the hard ring, and limiting sliders are welded to two corner ends of the U-shaped spring piece, and the limiting sliders slide inside the limiting slideway.

4. The oil seal for a gearbox according to claim 3, characterized in that: An outer arc-shaped edge B is provided at one end of the limit slider away from the U-shaped spring piece.

5. The oil seal for a gearbox according to claim 4, characterized in that: The inner sealing member comprises a rubber ring, a gas cavity is formed on the inner side of the rubber ring, an expansion sheet is installed on the inner wall of the gas cavity, the expansion sheet seals the gas cavity, and the interior of the gas cavity is filled with gas.

6. The oil seal for a gearbox according to claim 5, characterized in that: An upper cover plate is installed at the outer circle of the top of the inner wall of the outer ring plate, and a lower cover plate is installed at the outer circle of the bottom of the inner wall of the outer ring plate, and a 1 mm shallow groove is provided on the opposite surfaces of the lower cover plate and the upper cover plate.

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