Sealing structure and inner transmission

Abstract

The utility model relates to the technical field of inner transmissions, and discloses a sealing structure which comprises an inner sleeve piece and an outer sleeve piece sleeved outside the inner sleeve piece, and further comprises a first sealing ring sleeved on the inner wall of the outer sleeve piece and a second sealing ring sleeved on the outer wall of the inner sleeve piece, the first sealing ring and the second sealing ring are close to each other, an outer convex ring is arranged on the outer wall of the first sealing ring, and an outer convex ring is arranged on the outer wall of the second sealing ring. And an inner convex ring is arranged on the inner wall of the second sealing ring. The two sealing rings are fixed to the inner sleeve part and the outer sleeve part through the protruding rings respectively, installation is stable, relative rotation between the sealing rings does not interfere with each other and does not touch the bearing, it is guaranteed that rotation of the bearing is not affected, meanwhile, the sealing rings are independent of the bearing, and the sealing rings are convenient to replace. Through inner and outer labyrinth type blocking of the two layers of sealing rings, the bearing is double hidden, and it is avoided that dust is exposed and deposited on the bearing to affect the rotating smoothness of the bearing. The utility model further discloses an inner transmission comprising the sealing structure.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of inner transmission, especially to a sealing structure and inner transmission. BACKGROUND

[0002] The inner transmission is internally provided with various relatively rotating components, such as between the hub end cover and the planet carrier. These relatively rotating components will be rotatably received by bearings with sealing rings. In order to reduce friction, a non-contact sealing mode will be selected.

[0003] However, this sealing mode still exposes the bearings outside the sealing ring, and dust is still easy to deposit between the sealing ring and the bearings to reduce the smoothness of the bearings, and the sealing ring is not easy to replace. In addition, if the sealing ring is arranged outside the bearing, the sealing ring is easy to displace and touch the bearing, hindering the rotation of the bearing.

[0004] Therefore, it is necessary to propose a new sealing structure and inner transmission to solve the above problems, solve the problems of the traditional inner transmission non-contact sealing exposing the bearings, easy to deposit dust, inconvenient to replace the sealing ring, and the sealing ring easy to displace and touch the bearing to hinder the rotation of the bearing. SUMMARY

[0005] The utility model provides a sealing structure and inner transmission, solves the problem of the traditional inner transmission non-contact sealing exposing the bearings, easy to deposit dust, inconvenient to replace the sealing ring, and the sealing ring easy to displace and touch the bearing to hinder the rotation of the bearing.

[0006] The technical problem solved by the utility model is realized by the following technical scheme:

[0007] A sealing structure, comprising an inner sleeve and an outer sleeve sleeved on the outer side of the inner sleeve, further comprising a first sealing ring sleeved on the inner wall of the outer sleeve and a second sealing ring sleeved on the outer wall of the inner sleeve, the first sealing ring and the second sealing ring are close to each other, the outer wall of the first sealing ring is provided with an outer convex ring, and the inner wall of the second sealing ring is provided with an inner convex ring.

[0008] Further, the inner wall of the outer sleeve is provided with an inner ring groove accommodating the outer convex ring.

[0009] Further, the outer wall of the inner sleeve is provided with an outer ring groove accommodating the inner convex ring.

[0010] Further, the first sealing ring comprises a bulging ring tightly attached to the inner wall of the outer sleeve and a first stop ring located on the side away from the second sealing ring and extending inward.

[0011] Further, the second sealing ring comprises a sleeving ring tightly attached to the outer wall of the inner sleeve and a second stop ring located on the side away from the first sealing ring and extending outward.

[0012] Further, the collar extends into the expansion ring.

[0013] Further, a first gap is left between the first retainer ring and the inner sleeve, and the length of the first gap is less than the thickness of the collar.

[0014] Further, a second gap is left between the second retainer ring and the outer sleeve, and the length of the second gap is less than the thickness of the expansion ring.

[0015] Further, the inner sleeve is a planet carrier, and the outer sleeve is a hub end cover.

[0016] An inner transmission comprising the sealing structure.

[0017] The utility model has the beneficial effects that:

[0018] The utility model discloses a first seal ring is sleeved on the inner wall of the outer sleeve, and a second seal ring is sleeved on the outer wall of the inner sleeve, the first seal ring and the second seal ring are close to each other, the outer wall of the first seal ring is provided with an outer convex ring, the inner wall of the second seal ring is provided with an inner convex ring, and the two seal rings are fixed on the inner sleeve and the outer sleeve through the convex rings respectively, so that installation is stable, the relative rotation between the seal rings does not interfere with each other, does not touch the bearing, ensures that the rotation of the bearing is not influenced, is independent of the bearing at the same time, and the seal ring is convenient to replace, the bearing is double hidden through the inner and outer labyrinth type barriers of the two seal rings, and the bearing is exposed and deposits dust to avoid affecting the smoothness of the rotation of the bearing. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without the creative labor of the ordinary skilled in the art.

[0020] Figure 1 It is a perspective view of the inner transmission of the utility model.

[0021] Figure 2 It is a sectional view of the inner transmission of the utility model.

[0022] Figure 3 It is Figure 2 the enlarged view of A.

[0023] Among them:

[0024] 1-inner sleeve, 10-outer ring groove;

[0025] 2-outer sleeve, 20-inner ring groove;

[0026] 3 - first seal, 30 - outer protruding ring, 31 - expansion ring, 32 - first stop ring, 33 - first gap;

[0027] 4 - second seal, 40 - inner protruding ring, 41 - sleeve ring, 42 - second stop ring, 43 - second gap;

[0028] 500 - mandrel, 510 - gear shift assembly, 520 - pawl, 530 - sun gear, 540 - planetary gear, 550 - input, 560 - clutch, 570 - inner ring gear, 580 - output. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, purposes and effects of the utility model easy to understand, the utility model is further described below in combination with specific drawings.

[0030] Referring to Figures 1 to 3 A sealing structure, comprising an inner sleeve 1 and an outer sleeve 2 sleeved outside the inner sleeve 1, further comprising a first seal 3 sleeved on the inner wall of the outer sleeve 2 and a second seal 4 sleeved on the outer wall of the inner sleeve 1, the first seal 3 and the second seal 4 are close to each other, the outer wall of the first seal 3 is provided with an outer protruding ring 30, and the inner wall of the second seal 4 is provided with an inner protruding ring 40. The first seal 3 and the second seal 4 are respectively fixed on the outer sleeve 2 and the inner sleeve 1 through the outer protruding ring 30 and the inner protruding ring 40, respectively, stable installation, the relative rotation between the first seal 3 and the second seal 4 does not interfere with each other, does not touch the bearing, ensures that the bearing rotation is not affected, at the same time independent of the bearing, the first seal 3 and the second seal 4 are convenient to replace; through the inner and outer labyrinth type blocking of the two layers of the first seal 3 and the second seal 4, the bearing is double hidden, avoiding the bearing exposed to deposit dust affecting the smoothness of the bearing rotation.

[0031] Specifically, in use, the gear shift assembly 510 is operated to control the opening and closing of the pawl 520 on the mandrel 500. When the pawl 520 is retracted, the sun gear 530 and the planetary gear 540 rotate freely. When the input 550 inputs torque, it first passes through the inner sleeve 1, the rotating speed of the inner sleeve 1 is higher than that of the inner ring gear 570, then the clutch 560 is engaged, so that the rotating speed of the inner sleeve 1 is synchronized with that of the inner ring gear 570, the torque of the inner sleeve 1 is transmitted to the inner ring gear 570, and the inner ring gear 570 is output to the wheel through the output 580. At this time, the inner gearbox does not change speed through the planetary gear mechanism.

[0032] When the pawl 520 is open, it is in other gear positions, and one of the sun gears 530 is locked. When the input component 550 inputs torque, it first passes through the inner sleeve 1. The rotation of the inner sleeve 1 drives the planetary gear 540 to rotate. One of the sun gears 530 meshes with the planetary gear 540, making the rotational speed of the internal gear ring 570 higher than that of the inner sleeve 1. At this time, the clutch 560 disengages, allowing the torque of the internal gear ring 570 to be output to the wheel through the output component 580. The outer sleeve 2 on the output component 580 rotates relative to the inner sleeve 1. The outer sleeve 2 and the inner sleeve 1 are connected by a shaft. The bearing can rotate relative to each other. The first sealing ring 3 and the second sealing ring 4 are respectively fixed to the outer component 2 and the inner component 1 by the outer convex ring 30 and the inner convex ring 40, respectively, ensuring stable installation. The relative rotation between the first sealing ring 3 and the second sealing ring 4 does not interfere with each other and will not touch the bearing, ensuring that the bearing rotation is not affected. At the same time, they are independent of the bearing, and the first sealing ring 3 and the second sealing ring 4 are easy to replace. Through the inner and outer labyrinth-like barrier of the two layers of sealing rings, the bearing is doubly hidden, preventing the bearing from being exposed and accumulating dust, which would affect the smoothness of the bearing rotation. At this time, the internal gearbox is changed through the planetary gear mechanism.

[0033] The inner wall of the outer sleeve 2 is provided with an inner ring groove 20 to accommodate the outer protruding ring 30. The inner ring groove 20 can further fix the first sealing ring 3 with the outer protruding ring 30.

[0034] The outer wall of the inner sleeve 1 is provided with an outer ring groove 10 to accommodate the inner protruding ring 40. The outer ring groove 10 can further fix the second sealing ring 4 with the inner protruding ring 40.

[0035] The first sealing ring 3 includes an expansion ring 31 that fits tightly against the inner wall of the outer casing 2 and a first retaining ring 32 that is located on the side of the expansion ring 31 away from the second sealing ring 4 and extends inward. The expansion ring 31 allows the first sealing ring 3 to fit tightly against the inner wall of the outer casing 2, and the first retaining ring 32 serves as the main sealing part.

[0036] The second sealing ring 4 includes a collar 41 that fits tightly against the outer wall of the inner sleeve 1 and a second retaining ring 42 that is located on the side of the collar 41 away from the first sealing ring 3 and extends outward. The collar 41 allows the second sealing ring 4 to fit tightly against the outer wall of the inner sleeve 1, and the second retaining ring 42 serves as the main sealing part.

[0037] The collar 41 extends into the expansion collar 31. This effectively utilizes space.

[0038] A first gap 33 is left between the first retaining ring 32 and the inner sleeve 1, and the length of the first gap 33 is less than the thickness of the retaining ring 41. This increases the difficulty for dust to enter.

[0039] A second gap 43 is provided between the second retaining ring 42 and the outer sleeve 2, and the length of the second gap 43 is less than the thickness of the expansion ring 31. This increases the difficulty for dust to enter.

[0040] The inner sleeve 1 is a planet carrier, and the outer sleeve 2 is a hub end cover.

[0041] An inner transmission comprising the sealing structure.

[0042] The basic principle and main features of the present application and the advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A seal structure comprising an inner sleeve (1) and an outer sleeve (2) fitted outside the inner sleeve (1), characterized in that: The sealing structure further comprises a first sealing ring (3) arranged on the inner wall of the outer sleeve (2) and a second sealing ring (4) arranged on the outer wall of the inner sleeve (1), the first sealing ring (3) and the second sealing ring (4) are close to each other, the outer wall of the first sealing ring (3) is provided with an outer protruding ring (30), and the inner wall of the second sealing ring (4) is provided with an inner protruding ring (40).

2. The seal structure of claim 1, wherein: The inner wall of the outer sleeve (2) is provided with an inner ring groove (20) for accommodating the outer protruding ring (30).

3. The seal structure of claim 1, wherein: The outer wall of the inner sleeve (1) is provided with an outer ring groove (10) for accommodating the inner protruding ring (40).

4. The seal structure of claim 1, wherein: The first sealing ring (3) comprises a bulging ring (31) abutting against the inner wall of the outer sleeve (2) and a first blocking ring (32) extending inwardly on the side of the bulging ring (31) away from the second sealing ring (4).

5. The seal structure of claim 4, wherein: The second sealing ring (4) comprises a sleeve ring (41) abutting against the outer wall of the inner sleeve (1) and a second blocking ring (42) extending outwardly on the side of the sleeve ring (41) away from the first sealing ring (3).

6. The seal structure of claim 5, wherein: The sleeve ring (41) extends into the bulging ring (31).

7. The sealed structure of claim 5, wherein: The first blocking ring (32) and the inner sleeve (1) are provided with a first gap (33), and the length of the first gap (33) is smaller than the thickness of the sleeve ring (41).

8. The sealed structure of claim 5, wherein: The second blocking ring (42) and the outer sleeve (2) are provided with a second gap (43), and the length of the second gap (43) is smaller than the thickness of the bulging ring (31).

9. The seal structure according to any one of claims 1 to 8, characterized in that: The inner sleeve (1) is a planet carrier, and the outer sleeve (2) is a hub end cover.

10. A transfer case characterized by: The sealing structure comprises the sealing structure according to any one of claims 1 to 9.

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