Driving axle wheel hub combined waterproof oil seal structure

Abstract

The application provides a driving axle hub combined waterproof oil seal structure, which comprises a dust cover and an oil seal seat ring which are fixedly connected, and an oil seal assembly which is arranged on the inner side of the dust cover and the oil seal seat ring and comprises a framework, and an outer rubber body is arranged on the outer side of the framework; the oil seal assembly comprises a first oil seal, a second oil seal and a third oil seal; the top end of the first oil seal is in interference contact with the inner wall of the hub, the bottom end of the first oil seal is in interference contact with the inner wall of the oil seal seat ring, and the right end of the first oil seal is in interference contact with the inner wall of the dust cover; the second oil seal is arranged on the inner side of the first oil seal, the top end of the second oil seal is in interference contact with the first oil seal, and the bottom end of the second oil seal is in interference contact with the inner wall of the oil seal seat ring; the third oil seal is arranged on one side of the second oil seal, the top end of the third oil seal is in interference contact with the first oil seal, the right end of the third oil seal is in interference contact with the second oil seal, and the bottom end of the third oil seal is in interference contact with the inner wall of the oil seal seat ring; thus, the application effectively prevents the intrusion of external mud and dust and has good sealing performance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of waterproof oil seal, and particularly relates to a combined waterproof oil seal structure for a drive axle hub. BACKGROUND

[0002] At present, with the continuous development of the automobile industry, the requirements for axle performance are also getting higher and higher. The axle hub oil seal is one of the important sealing parts in the automobile chassis system, which realizes the double sealing effect of dynamic and static combination through interference fit with the shaft tube and the hub. At present, most of the axle oil seals adopt a single oil seal or two single oil seals to jointly seal the hub and the oil seal seat ring, and most of the sealing bodies are provided with a main dustproof oil seal opening. This way is only suitable for sealing in the working condition with less dust and impurities, but for the mining area, mountainous area and other places with more dust and mud, the environment is harsh, and the dustproof performance is poor and the sealing life is short, which leads to problems such as hub oil leakage and high oil seal failure rate. At the same time, according to the relevant policy requirements, before the cargo vehicle enters the urban road from the harsh construction area, it is required to clean the automobile chassis by means of water spraying or water tank, and under heavy load, the axle hub is short-term immersed in the environment mixed with dust and mud. If the hub oil seal cannot meet the requirement of mud-proof performance, the normal operation life of the wheel end is seriously reduced, which affects the normal construction of the customer. SUMMARY

[0003] The application provides a combined waterproof oil seal structure for a drive axle hub, which solves the above problems.

[0004] The technical scheme of the application is as follows: a combined waterproof oil seal structure for a drive axle hub, comprising:

[0005] A dust cover is fixedly connected between the oil seal seat ring and the dust cover.

[0006] The oil seal assembly comprises a plurality of oil seal assemblies, which are arranged on the inner side of the oil seal seat ring and the dust cover, and each oil seal assembly comprises a framework, an outer rubber body is sleeved on the outer side of the framework, and the oil seal assembly is in interference contact with the inner wall of the oil seal seat ring, the inner wall of the dust cover and the inner wall of the hub.

[0007] As a preferred embodiment, the dust cover is arranged in a U shape, the dust cover comprises a first cover body, a second cover body and a third cover body which are integrally connected, the first cover body is fixedly connected with the oil seal seat ring, the end of the third cover body is outwardly bent to form a lip guide fillet, and the second cover body is connected between the first cover body and the third cover body.

[0008] As a preferred embodiment, the oil seal assembly comprises:

[0009] a first oil seal, a top end of which is in interference contact with the inner wall of the hub, a bottom end of which is in interference contact with the inner wall of the oil seal retainer, and a right end of which is in interference contact with the inner wall of the dust cover;

[0010] a second oil seal, disposed on the inner side of the first oil seal, a top end of which is in interference contact with the first oil seal, and a bottom end of which is in interference contact with the inner wall of the oil seal retainer;

[0011] a third oil seal, disposed on one side of the second oil seal, a top end of which is in interference contact with the first oil seal, a right end of which is in interference contact with the second oil seal, and a bottom end of which is in interference contact with the inner wall of the oil seal retainer.

[0012] As a preferred embodiment, the first oil seal comprises a first skeleton, a first outer rubber body is sleeved on the outer side of the top end of the first skeleton, the first outer rubber body is in interference contact with the inner wall of the hub, a first sealing lip body is sleeved on the outer side of the bottom end of the first skeleton, and a small spring is arranged on the inner side of the first sealing lip body.

[0013] As a preferred embodiment, the first skeleton is arranged in an L shape, the first skeleton comprises a first connecting skeleton and a second connecting skeleton which are arranged in an integrated manner, the first outer rubber body is sleeved on the outer side of the first connecting skeleton, and the first outer rubber body is provided with a first end face and a second end face at both ends thereof;

[0014] the first sealing lip body is sleeved on the bottom end of the second connecting skeleton, the first sealing lip body is provided with a first sealing lip, a second sealing lip, a third sealing lip and a fourth sealing lip at the ends thereof, the first sealing lip is in interference contact with the inner wall of the third cover body, the second sealing lip, the third sealing lip and the fourth sealing lip are in interference contact with the inner wall of the oil seal retainer, and the fourth sealing lip is arranged below the small spring in correspondence.

[0015] As a preferred embodiment, the top face of the first outer rubber body is provided with a wavy rubber flange, and the rubber flange is arranged in interference fit with the inner hole of the hub.

[0016] As a preferred embodiment, the second oil seal comprises a second skeleton, a second outer rubber body is sleeved on the outer side of the top end of the second skeleton, the top face of the second outer rubber body is in interference contact with the bottom face of the first connecting skeleton, a second sealing lip body is sleeved on the outer side of the bottom end of the second skeleton, and a large spring is arranged on the inner side of the second sealing lip body.

[0017] As a preferred embodiment, the second skeleton is arranged in an L shape, the second skeleton comprises a first fixed skeleton and a second fixed skeleton which are arranged in an integrated manner, and the second outer rubber body is sleeved on the outer side of the first fixed skeleton;

[0018] The second sealing lip sleeve is arranged outside the bottom end of the second fixed framework, and the bottom end of the second sealing lip is provided with a fifth sealing lip opening, which is in interference contact with the inner wall of the oil seal seat ring.

[0019] As a preferred embodiment, the third oil seal comprises a third framework, and a third sealing lip sleeve is arranged outside the bottom end of the third framework.

[0020] As a preferred embodiment, the third framework is arranged in a P shape, and the third framework comprises a first support framework, a second support framework, a third support framework and a fourth support framework which are integrally connected.

[0021] The third sealing lip sleeve is arranged outside the bottom end of the fourth support framework, and the bottom end of the third sealing lip is provided with a sixth sealing lip opening, which is in interference contact with the inner wall of the oil seal seat ring.

[0022] After the above technical scheme is adopted, the application has the following advantages:

[0023] 1. The application has the advantages of improved mud and oil resistance, effective isolation of external mud and dust, good sealing performance, and better solution to the problem of insufficient sealing of the existing hub oil seal.

[0024] 2. The application solves the problems of poor mud resistance of the existing hub oil seal, short oil seal sealing life, and high maintenance cost of oil leakage. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor under the premise of not paying the creative labor.

[0026] Fig. 1 is a structural schematic view of the application;

[0027] Fig. 2 is another structural schematic view of the application.

[0028] In the figure, 1 - oil seal retainer; 2 - dust cover; 3 - first oil seal; 4 - second oil seal; 5 - third oil seal; 6 - wheel hub; 20 - first cover body; 21 - second cover body; 22 - third cover body; 23 - lip guiding fillet; 30 - first skeleton; 31 - first outer rubber body; 32 - first end face; 33 - second end face; 34 - first sealing lip body; 35 - small spring; 36 - rubber flange; 300 - first connecting skeleton; 301 - second connecting skeleton; 340 - first sealing lip; 341 - second sealing lip; 342 - third sealing lip; 343 - fourth sealing lip; 40 - second skeleton; 41 - second outer rubber body; 42 - second sealing lip body; 43 - large spring; 400 - first fixed skeleton; 401 - second fixed skeleton; 420 - fifth sealing lip; 50 - third skeleton; 51 - third sealing lip body; 500 - first supporting skeleton; 501 - second supporting skeleton; 502 - third supporting skeleton; 503 - fourth supporting skeleton; 510 - sixth sealing lip. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0030] According to Figs. 1-2 As shown in the figure, a driving axle wheel hub combined waterproof oil seal structure comprises:

[0031] The dust cover 2 is fixedly connected between the oil seal retainer 1.

[0032] The oil seal assembly comprises a plurality of oil seal assemblies, which are arranged on the inner side of the oil seal retainer 1 and the dust cover 2. The oil seal assembly comprises a skeleton, and an outer rubber body is sleeved on the outer side of the skeleton. The oil seal assembly is in interference contact with the inner wall of the oil seal retainer 1, the inner wall of the dust cover 2 and the inner wall of the wheel hub 6.

[0033] The dust cover 2 is arranged in a U shape. The dust cover 2 comprises a first cover body 20, a second cover body 21 and a third cover body 22 which are integrally connected. The first cover body 20 is fixedly connected between the oil seal retainer 1. The end of the third cover body 22 is outwardly bent to form a lip guiding fillet 23. The second cover body 21 is connected between the first cover body 20 and the third cover body 22.

[0034] The lip guiding fillet 23 is arranged to press the first sealing lip 340 inward along the guiding fillet when press-fitting, so as to effectively control the interference gap between the first sealing lip 340 and the third cover body 22.

[0035] The oil seal assembly comprises:

[0036] a first oil seal 3, the top end of which is in interference contact with the inner wall of the hub 6, the bottom end of which is in interference contact with the inner wall of the oil seal retainer 1, and the right end of which is in interference contact with the inner wall of the dust cover 2;

[0037] a second oil seal 4, which is arranged on the inner side of the first oil seal 3, the top end of which is in interference contact with the first oil seal 3, and the bottom end of which is in interference contact with the inner wall of the oil seal retainer 1;

[0038] a third oil seal 5, which is arranged on one side of the second oil seal 4, the top end of which is in interference contact with the first oil seal 3, the right end of which is in interference contact with the second oil seal 4, and the bottom end of which is in interference contact with the inner wall of the oil seal retainer 1.

[0039] The first oil seal 3 comprises a first skeleton 30, the outer side of the top end of which is sleeved with a first outer rubber body 31, the first outer rubber body 31 being in interference contact with the inner wall of the hub 6, and the outer side of the bottom end of the first skeleton 30 being sleeved with a first sealing lip body 34, the inner side of the first sealing lip body 34 being provided with a small spring 35.

[0040] The first skeleton 30 is arranged in an L shape, and comprises a first connecting skeleton 300 and a second connecting skeleton 301 which are integrally connected, the first outer rubber body 31 being sleeved on the outer side of the first connecting skeleton 300, and the two ends of the first outer rubber body 31 being respectively provided with a first end face 32 and a second end face 33;

[0041] The first sealing lip body 34 is sleeved on the bottom end of the second connecting skeleton 301, and the end part of the first sealing lip body 34 is respectively provided with a first sealing lip 340, a second sealing lip 341, a third sealing lip 342 and a fourth sealing lip 343, wherein the first sealing lip 340 is in interference contact with the inner wall of the third cover body 22, the second sealing lip 341, the third sealing lip 342 and the fourth sealing lip 343 are in interference contact with the inner wall of the oil seal retainer 1, and the fourth sealing lip 343 is correspondingly arranged below the small spring 35.

[0042] The top face of the first outer rubber body 31 is provided with a wavy rubber flange 36, and the rubber flange 36 is arranged in interference fit with the inner hole of the hub 6. The first outer rubber body 31 is unevenly arranged to achieve axial static sealing after being pressed in.

[0043] The second oil seal 4 comprises a second skeleton 40, the outer side of the top end of which is sleeved with a second outer rubber body 41, the top face of the second outer rubber body 41 being in interference contact with the bottom face of the first connecting skeleton 300, and the outer side of the bottom end of the second skeleton 40 being sleeved with a second sealing lip body 42, the inner side of the second sealing lip body 42 being provided with a large spring 43.

[0044] The second skeleton 40 is arranged in an L shape, and comprises a first fixed skeleton 400 and a second fixed skeleton 401 which are arranged in an integral connection, and the second outer rubber body 41 is sleeved on the outer side of the first fixed skeleton 400;

[0045] The second sealing lip body 42 is sleeved on the outer side of the bottom end of the second fixed skeleton 401, and the bottom end of the second sealing lip body 42 is provided with a fifth sealing lip opening 420, the fifth sealing lip opening 420 is in interference contact with the inner wall of the oil seal seat ring 1, and the fifth sealing lip opening 420 is correspondingly arranged below the large spring 43.

[0046] The third oil seal 5 comprises a third skeleton 50, and the bottom end of the third skeleton 50 is sleeved with a third sealing lip body 51 on the outer side.

[0047] The third skeleton 50 is arranged in a P shape, and comprises a first support skeleton 500, a second support skeleton 501, a third support skeleton 502 and a fourth support skeleton 503 which are arranged in an integral connection, wherein the top surface of the first support skeleton 500 is arranged in interference fit with the bottom surface of the first connecting skeleton 300, and the right side surface of the second support skeleton 501 is in interference contact with the left side surface of the second outer rubber body 41.

[0048] The third sealing lip body 51 is sleeved on the outer side of the bottom end of the fourth support skeleton 503, and the bottom end of the third sealing lip body 51 is provided with a sixth sealing lip opening 510, the sixth sealing lip opening 510 is in interference contact with the inner wall of the oil seal seat ring 1.

[0049] The first oil seal 3, the second oil seal 4 and the third oil seal 5 are installed in an integral manner, a tool presses the top surface of the first outer rubber body 31 along the inner hole of the hub 6 to press in, the top surface of the first outer rubber body 31 is pressed to be flush with the end surface of the hub 6, and then the hub 6 assembly is pressed and installed on the shaft head, so that the first sealing lip opening 340, the second sealing lip opening 341, the third sealing lip opening 342, the fourth sealing lip opening 343, the fifth sealing lip opening 420 and the sixth sealing lip opening 510 realize axial dynamic sealing.

[0050] Experimental example

[0051] In order to verify the present application, the present application is subjected to a mud water prevention bench test in a simulated harsh environment condition with more dust and soil, and the test conditions are as follows:

[0052] Experimental medium: the ratio of solid medium to water is 200g / L, that is, 150g of solid medium is added in 1L of water to prepare a mud water state.

[0053] Experimental speed: 700r / min is adopted.

[0054] Experimental method: the outer three quarters of the application are immersed in the above-mentioned mud medium, the inner half of the application is immersed in oil, after 16h of forward operation, 4h of reverse operation, and 4h of shutdown.

[0055] Through the above experiment, it can be verified that the sealing structure adopted by the application can be leak-free within 500h, thus it can be explained that its anti-mud and anti-oil performance is excellent, it can effectively isolate the intrusion of external mud and dust, has good sealing performance, and well solves the problem of insufficient sealing of the existing hub 6 oil seal.

[0056] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, unless otherwise specified and limited, it should be explained that the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be mechanical connection or electrical connection, it can be the communication between two elements, it can be direct connection, or indirect connection through intermediate medium, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0057] The above is only the preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A combined waterproof oil seal structure for drive axle hubs, characterized in that, include: The dust cover is fixedly connected to the oil seal seat ring; The oil seal assembly includes several units, all of which are disposed inside the oil seal seat and the dust cover. The oil seal assembly includes a skeleton, and an outer rubber body is sleeved on the outer side of the skeleton. The oil seal assembly is in interference contact with the inner wall of the oil seal seat, the inner wall of the dust cover, and the inner wall of the wheel hub, respectively. The dust cover is U-shaped and includes a first cover body, a second cover body, and a third cover body that are integrally connected. The first cover body and the oil seal seat ring are fixedly connected. The end of the third cover body is bent outward to form a lip guide rounded corner. The second cover body is connected to the first cover body and the third cover body. The oil seal assembly includes: The first oil seal has its top end in interference contact with the inner wall of the hub, its bottom end in interference contact with the inner wall of the oil seal seat, and its right end in interference contact with the inner wall of the dust cover. The second oil seal is located inside the first oil seal, with its top end in interference contact with the first oil seal and its bottom end in interference contact with the inner wall of the oil seal seat ring. The third oil seal is located on one side of the second oil seal. Its top end is in interference contact with the first oil seal, its right end is in interference contact with the second oil seal, and its bottom end is in interference contact with the inner wall of the oil seal seat ring. The first oil seal includes a first skeleton, a first outer rubber body is fitted on the outer top of the first skeleton, the first outer rubber body is in interference contact with the inner wall of the hub, a first sealing lip is fitted on the outer bottom of the first skeleton, and a small spring is provided on the inner side of the first sealing lip. The first frame is L-shaped and includes a first connecting frame and a second connecting frame integrally connected. The first outer rubber body is sleeved on the outside of the first connecting frame, and the two ends of the first outer rubber body are respectively provided with a first end face and a second end face. The first sealing lip is sleeved on the bottom end of the second connecting frame. The ends of the first sealing lip are respectively provided with a first sealing lip, a second sealing lip, a third sealing lip and a fourth sealing lip. The first sealing lip is in interference contact with the inner wall of the third cover. The second sealing lip, the third sealing lip and the fourth sealing lip are in interference contact with the inner wall of the oil seal seat ring. The fourth sealing lip is correspondingly located below the small spring. The second oil seal includes a second skeleton, a second outer rubber body is fitted on the outer side of the top of the second skeleton, the top surface of the second outer rubber body and the bottom surface of the first connecting skeleton are in interference contact, a second sealing lip is fitted on the outer side of the bottom of the second skeleton, and a large spring is provided on the inner side of the second sealing lip. The third oil seal includes a third skeleton, and a third sealing lip is fitted on the outer side of the bottom end of the third skeleton; The third frame is P-shaped and includes a first support frame, a second support frame, a third support frame and a fourth support frame integrally connected. The top surface of the first support frame and the bottom surface of the first connecting frame are interference-fitted, and the right side surface of the second support frame and the left side surface of the second outer rubber body are interference-fitted. The third sealing lip is sleeved on the outer side of the bottom end of the fourth support frame, and the bottom end of the third sealing lip is provided with a sixth sealing lip, which is in interference contact with the inner wall of the oil seal seat ring.

2. The drive axle hub combined waterproof oil seal structure according to claim 1, characterized in that, The top surface of the first outer rubber body is provided with a wavy rubber flange, and the rubber flange and the inner hole of the hub are configured with an interference fit.

3. The drive axle hub combined waterproof oil seal structure according to claim 1, characterized in that, The second frame is L-shaped and includes a first fixed frame and a second fixed frame integrally connected together. The second outer rubber body is sleeved on the outside of the first fixed frame. The second sealing lip is sleeved on the outer side of the bottom end of the second fixed frame. The bottom end of the second sealing lip is provided with a fifth sealing lip. The fifth sealing lip and the inner wall of the oil seal seat are in interference contact. The fifth sealing lip is correspondingly located below the large spring.

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