CN223049361U - Differential oil seal to prevent mud and water intrusion - Google Patents

Abstract

The utility model relates to the technical field of sealing, and in particular to a differential oil seal for preventing mud and water from intruding, comprising an oil seal main body sleeved on a half-shaft and a dust cover connected to the half-shaft, an elastic connector connected between the oil seal main body and the dust cover, the oil seal main body comprising an oil seal skeleton, and a rubber body coated on the outside of the oil seal skeleton and in contact with the half-shaft to form a seal, the oil seal main body, the dust cover, the elastic connector and the half-shaft form a first sealing cavity, the oil seal main body, the dust cover, the elastic connector and the half-shaft of the device form a sealing system, the elastic connector can prevent dust, mud and water from entering the first sealing cavity, avoid aggravated wear of an inner dust lip due to the entry of dust, mud and water, and cause failure of the main lip seal, thereby extending the service life of the entire set of seals and achieving long-term sealing.

Description

Differential mechanism oil seal capable of preventing muddy water from invading

Technical Field

The utility model relates to the technical field of sealing, in particular to a differential mechanism oil seal capable of preventing muddy water from invading.

Background

The differential mechanism oil seal is arranged at the output shaft end of the gearbox, and mainly aims to prevent lubricating oil in the gearbox from leaking into the outside air to cause environmental pollution, and meanwhile, the outside dust and muddy water can be prevented from entering the gearbox. Under wading working conditions, once water enters the gearbox, engine oil in the cavity is emulsified, gears and bearings are abnormally worn, the vehicle cannot continue to run finally, and riding experience is seriously affected. Through investigation, water entering the gearbox is mostly entered in an oil seal area at the joint of the axle shaft of the wheel differential and the gearbox.

At present, two common oil seals of the differential mechanism are arranged in the oil seal mode, the attached 1 is a conventional spring oil seal, an inner dustproof lip and a half shaft are in small interference fit to form a seal, but the abrasion of the inner dustproof lip which is directly exposed to the outside is extremely serious after the half shaft runs for a period of time, a gap is formed between the half shaft and the inner dustproof lip, and external dust and muddy water cannot be effectively prevented from entering the main lip area of the oil seal, so that the seal is invalid. Fig. 2 is a combined seal of a spring oil seal with an outer dustproof lip and a dustproof cover, compared with fig. 1, by adding a long dustproof lip on the outer side of the oil seal, although dust and muddy water can be reduced to a certain extent and directly enter a main lip area of the oil seal through the dustproof lip, as the long dustproof lip and the dustproof cover adopt small gaps or small interference fit and are in aggravated along with abrasion, a large gap is formed between the long dustproof lip and the dustproof cover, when a wading working condition exists, part of muddy water still directly passes through the outer dustproof lip and enters the main lip of the oil seal, the sealing effect of the differential oil seal is reduced, and because a larger axial running amount and radial running amount exist in the working process of a half shaft, the abrasion of the long dustproof lip is further increased, so that the service life of the differential oil seal is obviously reduced.

Disclosure of utility model

The utility model provides a differential mechanism oil seal for preventing muddy water from invading in order to overcome the defects in the prior art.

In order to achieve the above purpose, the differential mechanism oil seal capable of preventing muddy water from invading comprises an oil seal main body sleeved on a half shaft and a dust cover connected to the half shaft, wherein an elastic connector is connected between the oil seal main body and the dust cover, the oil seal main body comprises an oil seal framework and a rubber body which is coated outside the oil seal framework and is in contact with the half shaft to form a seal, and the oil seal main body, the dust cover, the elastic connector and the half shaft form a first seal cavity.

Preferably, the oil seal framework is provided with a supporting part for supporting the rubber body, a clamping part connected with the elastic connecting body and a connecting part for connecting the clamping part and the supporting part, and the clamping part is provided with a first groove cavity for accommodating the first end part of the elastic connecting body.

Preferably, the dust cover is provided with a dust-proof main board abutted to the second end part of the elastic connecting body, and one side of the dust-proof main board is provided with a sealing baffle plate contacted with the half shaft.

Preferably, the rubber body is provided with a coating body and a sealing body, wherein the coating body is coated outside the supporting part, the sealing body is provided with an inner dustproof lip which is contacted with the half shaft on the side close to the first sealing cavity, a main lip which is contacted with the half shaft is arranged on the side far away from the first sealing cavity along the axial direction, and the main lip, the inner dustproof lip and the half shaft form a second sealing cavity.

Preferably, the sealing body is provided with a flange near the inner dust lip, and the flange and the cladding form a second groove cavity for accommodating the end part of the supporting part.

Preferably, the number of the inner dust-proof lips is two, and the two groups of the inner dust-proof lips and the half shaft form a third sealing cavity.

Preferably, a set of garter springs is provided around the side wall of the main lip.

Preferably, the elastic connector is a bellows.

The beneficial effects of the utility model are as follows:

1. The oil blanket main part, the dust cover of this device, elastic connection body and semi-axis form a sealing system, the interior dustproof lip of oil blanket main part can prevent that impurity from entering the main lip region, main lip can prevent that lubricating oil from revealing or impurity from entering in the gearbox, the elastic connection body can prevent dust, muddy water from entering first sealed intracavity, avoid leading to the aggravation wearing and tearing of interior dustproof lip because of the entering of dust, muddy water, make main lip seal inefficacy to prolonged the sealed life of whole set, realized long-term sealing.

2. One end of the elastic connecting body is connected with the oil seal main body, the other end of the elastic connecting body is abutted against the dust cover, and the pre-compression amount of the elastic connecting body is utilized, so that poor protection effect caused by the clearance generated by axial movement and radial runout in the working process of the half shaft can be avoided, the abrasion loss in the working process of the elastic connecting body can be counteracted, the good sealing performance of the whole sealing system is ensured, and the service life of the device is further prolonged.

Drawings

FIG. 1 is a cross-sectional view of a conventional spring oil seal of the prior art;

FIG. 2 is a cross-sectional view of a prior art spring oil seal with an outboard dust lip in combination with a dust cap seal;

FIG. 3 is a cross-sectional view of the overall structure of the present utility model;

FIG. 4 is a cross-sectional view of an oil seal skeleton according to the present utility model;

FIG. 5 is a cross-sectional view of a rubber body according to the present utility model;

Fig. 6 is a cross-sectional view of an elastic connector according to the present utility model.

In the figure, 1, a half shaft, 2, a dust cover, 201, a dust-proof main plate, 202, a sealing baffle, 3, an elastic connector, 4, an oil seal framework, 5, a rubber body, 6, a first sealing cavity, 7, a third sealing cavity, 8, a second sealing cavity, 9, a clamping spring, 10, an oil seal main body, 11, a clamping part, 12, a connecting part, 13, a supporting part, 14, a first groove cavity, 15, a cladding body, 16, a sealing body, 17, an inner dust lip, 18, a main lip, 19, a flange, 20, a second groove cavity, 21, a first end, 22 and a second end.

Detailed Description

The principles and features of the present utility model are described below with reference to fig. 1 through 6, the examples being provided for illustration only and not for limitation of the scope of the utility model.

The utility model provides a differential mechanism oil blanket that mud water invaded is prevented, as shown in fig. 3-6, including the cover locate the oil blanket main part 10 on the semi-axis 1 and connect the dust cover 2 on the semi-axis 1, be equipped with the elastic connection body 3 between oil blanket main part 10 and the dust cover 2, the elastic connection body 3 can prevent dust and mud water, in this embodiment, the elastic connection body 3 is the bellows. The oil seal main body 10, the dust cover 2, the elastic connector 3 and the half shaft 1 form a first seal cavity 6.

The oil seal main body 10 comprises an oil seal framework 4 and a rubber body 5, wherein the oil seal framework 4 is provided with a supporting part 13 for supporting the rubber body 5, a clamping part 11 connected with the elastic connector 3 and a connecting part 12 for connecting the clamping part 11 and the supporting part 13, and the clamping part 11 is provided with a first groove cavity 14 for accommodating a first end part 21 of the elastic connector 3, so that the elastic connector 3 can be prevented from falling off in the using process. The rubber body 5 is equipped with the cladding body 15 that coats in the supporting part 13 outside, and the sealing body 16, the sealing body 16 is equipped with the interior dustproof lip 17 that contacts with the semi-axis 1 in being close to first sealed chamber 6 side, along axial direction, keep away from first sealed chamber 6 side be equipped with the main lip 18 of semi-axis 1 contact, main lip 18, interior dustproof lip 17 forms second sealed chamber 8 with semi-axis 1, main lip 18 mainly used prevents that lubricating oil from revealing in the gearbox from getting into external environment, interior dustproof lip 17 mainly used prevents that external dust, muddy water from passing main lip 18 and entering into the gearbox, can prevent simultaneously that external dust, muddy water from causing the destruction to main lip 18. In order to ensure the sealing effect and prolong the service life, the number of the inner dustproof lips 17 is two, a third sealing cavity 7 is formed by the inner dustproof lips and the half shaft 1, and a group of tightening springs 9 are arranged at the side wall of the rubber body 5 surrounding the main lip 18.

In order to prevent cracking between the oil seal frame 4 and the rubber body 5 due to poor end coating, the sealing body 16 is provided with a flange 19 on the side close to the inner dust lip 17, the flange 19 and the coating body 15 form a second groove cavity 20 for accommodating the end of the supporting portion 13, and the end of the supporting portion 13 is fully coated.

The second end 22 of the elastic connector 3 is in contact with a dust-proof main plate 201 of the dust cover 2, and a sealing baffle 202 in contact with the half shaft 1 is provided on one side of the dust-proof main plate 201. In the early assembly process, the elastic connector 3 is kept with a certain precompression amount, the precompression amount can compensate the abrasion amount of the elastic connector 3 and the axial running amount of the half shaft 1 during the later use process, so that the second end 22 of the elastic connector 3 is abutted against the dustproof main plate 201 of the dustproof cover 2 all the time without generating gaps, external dust and muddy water can be effectively prevented from entering the first sealing cavity 6, and when the half shaft 1 generates radial runout, the second end 22 of the elastic connector 3 can still realize better sealing due to the precompression amount when sliding relatively to the dustproof main plate 201, thereby preventing dust and muddy water from entering the inner dustproof lip 17, causing excessive abrasion to the inner dustproof lip 17, and prolonging the service life of the differential oil seal.

The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.

Claims (8)

1. The differential mechanism oil seal capable of preventing muddy water from invading is characterized by comprising an oil seal main body (10) sleeved on a half shaft (1) and a dust cover (2) connected to the half shaft (1), an elastic connecting body (3) is connected between the oil seal main body (10) and the dust cover (2), the oil seal main body (10) comprises an oil seal framework (4) and a rubber body (5) coated outside the oil seal framework (4) and in contact with the half shaft (1) to form a seal, and the oil seal main body (10), the dust cover (2), the elastic connecting body (3) and the half shaft (1) form a first seal cavity (6).

2. The differential oil seal against muddy water intrusion according to claim 1, characterized in that the oil seal skeleton (4) is provided with a supporting portion (13) for supporting the rubber body (5), a clamping portion (11) connected with the elastic connecting body (3), and a coupling portion (12) connecting the clamping portion (11) and the supporting portion (13), the clamping portion (11) being provided with a first groove cavity (14) accommodating a first end portion (21) of the elastic connecting body (3).

3. The differential oil seal for preventing muddy water intrusion according to claim 2, wherein the dust cover (2) is provided with a dust-proof main plate (201) abutted against the second end (22) of the elastic connector (3), and a sealing baffle plate (202) in contact with the half shaft (1) is provided on one side of the dust-proof main plate (201).

4. A differential oil seal against muddy water intrusion according to claim 3, characterized in that the rubber body (5) is provided with a coating body (15) coating the outside of the supporting portion (13), and a sealing body (16), the sealing body (16) is provided with an inner dust lip (17) contacting the half shaft (1) on the side close to the first sealing chamber (6), and a main lip (18) contacting the half shaft (1) is provided on the side away from the first sealing chamber (6) in the axial direction, and the main lip (18), the inner dust lip (17) and the half shaft (1) form a second sealing chamber (8).

5. The differential oil seal against intrusion of muddy water according to claim 4, characterized in that said seal body (16) is provided with a flange (19) on the side close to said inner dust lip (17), said flange (19) and said cover body (15) forming a second groove chamber (20) for accommodating the end of said supporting portion (13).

6. The differential oil seal for preventing muddy water intrusion according to claim 4, wherein the number of the inner dust-proof lips (17) is two, and the two groups of the inner dust-proof lips (17) and the half shaft (1) form a third sealing cavity (7).

7. The oil seal for a differential mechanism for preventing intrusion of muddy water according to claim 4, wherein said rubber body (5) is further provided with a set of tightening springs (9) at a side wall surrounding said main lip (18).

8. The differential oil seal for preventing muddy water intrusion according to claim 1, wherein the elastic connection body (3) is a bellows.