Framework oil seal with high water resistance

Abstract

The utility model discloses a framework oil seal with strong water resistance, which belongs to the technical field of oil seals, and comprises a support framework, a rubber excircle oil seal body coated on the outer edge of the support framework, a diaphragm coated on the inner edge of the support framework, and a spring arranged on the outer edge of the diaphragm, a dustproof lip, a water blocking lip and an inner lip are sequentially arranged on the inner edge of the diaphragm in the axial position of the rubber excircle oil seal body from outside to inside, and a water blocking externally tangent trimming surface is arranged on the side, close to the dustproof lip, of the water blocking lip; under the tightening force of the spring, the water-blocking end of the water-blocking lip is matched with the water-blocking externally-tangent trimming surface and the water-blocking internally-tangent trimming surface to be used as the smallest contact surface with an assembly shaft, the friction force is reduced, meanwhile, the best water-blocking effect is achieved, the oblique angle of the end of the inner lip makes contact with the assembly shaft, the oil-blocking effect is achieved, and the service life of the water-blocking lip is prolonged. And the problem of leakage caused by different oil-water densities is effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil seal technical field more specifically, relate to a kind of skeleton oil seal with strong water resistance. BACKGROUND

[0002] The function of oil seal is generally to isolate the parts needing lubrication in transmission components from the external environment, preventing lubricating oil from leaking. The skeleton oil seal is composed of a rubber outer circular oil seal body, a reinforcing skeleton and a self-tightening spiral spring. The skeleton oil seal in a free state has a certain amount of interference between its inner diameter and the shaft diameter. Therefore, after the oil seal is installed on the oil seal seat and the shaft, the pressure of the oil seal cutting edge and the contraction force of the self-tightening spiral spring generate a certain radial tight force on the shaft, achieving the sealing purpose.

[0003] The existing patent, a double-lip structure oil seal, patent number CN220354473U includes a support skeleton, the outer edge of the support skeleton is covered with a rubber outer circular oil seal body, and the bottom of the support skeleton is provided with a waist structure. The inner side and the outer side of the waist structure are respectively provided with a first sealing structure for sealing lubricating oil and a second sealing structure for sealing gas. The first sealing structure includes an oil sealing main lip protruding on the inner side bottom of the waist structure, and the second sealing structure includes a gas sealing main lip protruding on the outer side bottom of the waist structure. The lip portion of the gas sealing main lip is provided with a sealing layer for sealing gas, thereby solving the technical problem that the existing skeleton oil seal is difficult to seal high-pressure gas.

[0004] However, the oil seal in patent number CN220354473U adopts a double-lip structure, which is not good at preventing water when used as a sealing element in a water pump due to the difference in density between oil and water. To provide an oil seal for a water pump, we propose a skeleton oil seal with strong water resistance to solve the above problems. SUMMARY

[0005] 1. Technical problem to be solved

[0006] In view of the problems existing in the prior art, the purpose of the utility model is to provide a skeleton oil seal with strong water resistance. Under the tightening force of the spring, the water resistance end of the water resistance lip cooperates with the water resistance outer tangent finish and the water resistance inner tangent finish to form the smallest contact surface with the assembly shaft, which reduces friction and achieves the best water resistance effect. The end of the inner lip is in contact with the assembly shaft at an oblique angle, which plays a role in resisting oil. This effectively solves the problem of oil and water density difference leakage and is suitable for water pumps.

[0007] 2. Technical solution

[0008] To solve the above problems, the utility model adopts the following technical solution.

[0009] A strong water resistance skeleton oil seal, comprising a support skeleton, a rubber outer circular oil seal body wrapped along the outer edge of the support skeleton, a diaphragm wrapped along the inner edge of the support skeleton, and a spring installed along the outer edge of the diaphragm, wherein the inner edge of the diaphragm is sequentially provided with a dust lip, a water blocking lip and an inner lip from outside to inside in the axial position of the rubber outer circular oil seal body.

[0010] The water blocking lip is provided with a water blocking outer tangent finish on the side close to the dust lip, and a water blocking inner tangent finish on the side close to the inner lip.

[0011] The water blocking end part is provided at the joint of the water blocking outer tangent finish and the water blocking inner tangent finish.

[0012] A first transition groove is provided between the dust lip and the water blocking lip.

[0013] A second transition groove is provided between the water blocking lip and the inner lip.

[0014] Further, the water blocking end part is provided in a planar structure.

[0015] The sealing end of the dust lip, the water blocking end part and the sealing end of the inner lip sequentially extend to the central axis of the rubber outer circular oil seal body.

[0016] Further, the dust lip, the water blocking lip and the inner lip are integrally formed with the diaphragm.

[0017] Further, the included angle between the water blocking outer tangent finish and the water blocking inner tangent finish and the central axis of the rubber outer circular oil seal body is less than 90°.

[0018] Further, the curvature of the first transition groove is greater than that of the second transition groove.

[0019] Further, the front end edge part of the rubber outer circular oil seal body is provided with a front chamfer.

[0020] Further, the end edge part of the rubber outer circular oil seal body is provided with a rear chamfer.

[0021] 3. Beneficial effects

[0022] Compared with the prior art, the utility model has the advantages that:

[0023] (1) The water blocking end part of the water blocking lip cooperates with the water blocking outer tangent finish and the water blocking inner tangent finish to have the smallest contact surface with the assembly shaft under the tightening force of the spring, thereby reducing the friction and achieving the best water blocking effect, the end part of the inner lip contacts the assembly shaft to block oil, thereby further improving the sealing effect while reducing the friction, effectively solving the leakage caused by the different densities of oil and water, and being applicable to water pumps.

[0024] (2) In this scheme, the end of the dust-proof lip is provided with an inclined angle to contact the assembling shaft, so that the contact area between the end of the lip and the assembling shaft can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0026] Figure 2 It is a schematic diagram of the side view of the utility model;

[0027] Figure 3 It is a schematic diagram of the A-section of the utility model;

[0028] Figure 4 It is a local structure diagram of the skeleton oil seal with strong water resistance provided by the utility model.

[0029] Explanation of reference numerals in the drawing:

[0030] 1, rubber outer circle oil seal body; 2, support skeleton; 3, diaphragm; 4, spring; 5, dust-proof lip; 6, water-blocking lip; 7, inner lip; 8, water-blocking outer tangent finish surface; 9, water-blocking inner tangent finish surface; 10, water-blocking end; 11, first transition groove; 12, second transition groove. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model; obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments; based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0032] Embodiment:

[0033] Please refer to Figures 1-4 A skeleton oil seal with strong water resistance, comprising a support skeleton 2, a rubber outer circle oil seal body 1 wrapped along the outer edge of the support skeleton 2, a diaphragm 3 wrapped along the inner edge of the support skeleton 2, and a spring 4 installed along the outer edge of the diaphragm 3, wherein the inner edge of the diaphragm 3 is sequentially provided with a dust-proof lip 5, a water-blocking lip 6 and an inner lip 7 from the outside to the inside in the axial position of the rubber outer circle oil seal body 1.

[0034] The water-blocking lip 6 is provided with a water-blocking outer tangent finish surface 8 on the side close to the dust-proof lip 5, and is provided with a water-blocking inner tangent finish surface 9 on the side close to the inner lip 7.

[0035] The water-blocking end 10 is arranged at the position where the water-blocking outer tangent finish surface 8 and the water-blocking inner tangent finish surface 9 are combined.

[0036] A first transition groove 11 is arranged between the dustproof lip 5 and the water-blocking lip 6.

[0037] A second transition groove 12 is arranged between the water-blocking lip 6 and the inner lip 7.

[0038] The end of the dustproof lip 5 is arranged to be in contact with the assembly shaft at an angle, so as to reduce the contact area between the end of the dustproof lip 5 and the assembly shaft. The water-blocking end 10 of the water-blocking lip 6 is matched with the water-blocking outer tangent chamfer 8 and the water-blocking inner tangent chamfer 9 under the tightening force of the spring 4, so as to have the smallest contact area with the assembly shaft, to reduce the friction and achieve the best water-blocking effect. The end of the inner lip 7 is arranged to be in contact with the assembly shaft at an angle, to achieve the oil-blocking effect, to further improve the sealing effect while reducing the friction, to effectively solve the leakage caused by the different densities of oil and water, and to achieve the good water-blocking effect, and to be suitable for water pumps.

[0039] As shown in Figure 3 , Figure 4 , the water-blocking end 10 is arranged in a plane structure.

[0040] The sealing end of the dustproof lip 5, the water-blocking end 10 and the sealing end of the inner lip 7 extend to the central axis of the rubber outer circular oil seal body 1 in sequence.

[0041] As shown in Figure 3 , Figure 4 , the dustproof lip 5, the water-blocking lip 6 and the inner lip 7 are integrally formed with the diaphragm 3, and the angles between the water-blocking outer tangent chamfer 8 and the water-blocking inner tangent chamfer 9 and the central axis of the rubber outer circular oil seal body 1 are less than 90°.

[0042] The water-blocking lip 6 provided in the embodiment is matched with the water-blocking outer tangent chamfer 8 and the water-blocking inner tangent chamfer 9 through the water-blocking end 10 of the water-blocking lip 6 under the tightening force of the spring 4, so as to have the smallest contact area with the assembly shaft, to reduce the friction and achieve the best water-blocking effect.

[0043] As shown in Figure 4 , the curvature of the first transition groove 11 is greater than the curvature of the second transition groove 12.

[0044] The water-blocking lip 6 provided in the embodiment is transitioned to the dustproof lip 5 and the inner lip 7 through the first transition groove 11 and the second transition groove 12 respectively, so as to effectively prevent the cracking of the connecting parts between the water-blocking lip 6 and the dustproof lip 5 and the inner lip 7 caused by stress.

[0045] As shown in Figure 2 , the front end edge part of the rubber outer circular oil seal body 1 is arranged with a front chamfer, and the end edge part of the rubber outer circular oil seal body 1 is arranged with a rear chamfer.

[0046] The strong water-resisting skeleton oil seal is installed in the assembly space between the assembly shaft and the assembly part, and the outer diameter fitting surface of the oil seal is in interference fit with the assembly part, so that the oil seal is convenient to install and the friction with the assembly part is reduced.

[0047] In use: by assembling the oil seal to the designated position of the water pump assembly shaft, the end of the dustproof lip 5 is in contact with the assembly shaft through the inclined angle, so that the contact area between the end of the lip and the assembly shaft is reduced, the water-resisting end 10 of the water-resisting lip 6 is in contact with the assembly shaft through the water-resisting outer tangent chamfer 8 and the water-resisting inner tangent chamfer 9 under the tightening force of the spring 4, the water-resisting effect is best while the friction is reduced, and the end of the inner lip 7 is in contact with the assembly shaft through the inclined angle, so that the sealing effect is further improved while the friction is reduced.

[0048] The above merely describes the preferred embodiments of the present application; however, the protection scope of the present application is not limited to this. Any skilled person in the art, according to the technical scheme and the improved conception of the present application, can make equivalent replacement or change within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A strongly water-resistant skeleton oil seal, comprising a supporting skeleton (2), a rubber outer circular oil seal body (1) covering the outer edge of the supporting skeleton (2), a diaphragm (3) covering the inner edge of the supporting skeleton (2), and a spring (4) mounted on the outer edge of the diaphragm (3), characterized in that: The inner edge of the diaphragm (3) is provided with a dustproof lip (5), a water-blocking lip (6) and an inner lip (7) in sequence from the outside to the inside at the axial position of the rubber outer circle oil seal body (1); The water-blocking lip (6) has a water-blocking outer cut surface (8) on the side near the dustproof lip (5), and the water-blocking lip (6) has a water-blocking inner cut surface (9) on the side near the inner lip (7). A water-blocking end (10) is provided at the junction of the water-blocking outer tangential surface (8) and the water-blocking inner tangential surface (9); A first transition groove (11) is provided between the dustproof lip (5) and the water-blocking lip (6); A second transition groove (12) is provided between the water-blocking lip (6) and the inner lip (7).

2. The strongly water-resistant skeleton oil seal according to claim 1, characterized in that: The water-blocking end (10) is provided with a planar structure; The sealing end of the dustproof lip (5), the water-blocking end (10), and the sealing end of the inner lip (7) extend sequentially toward the central axis of the rubber outer circle oil seal (1).

3. The strongly water-resistant skeleton oil seal according to claim 1, characterized in that: The dustproof lip (5), water-blocking lip (6), and inner lip (7) are integrally formed with the diaphragm (3).

4. The strongly water-resistant skeleton oil seal according to claim 1, characterized in that: The angles between the water-blocking outer tangent surface (8) and the water-blocking inner tangent surface (9) and the central axis of the rubber outer circular oil seal body (1) are both less than 90°.

5. The strongly water-resistant skeleton oil seal according to claim 1, characterized in that: The curvature of the first transition groove (11) is greater than that of the second transition groove (12).

6. The strongly water-resistant skeleton oil seal according to claim 1, characterized in that: The front edge of the rubber outer circular oil seal (1) is provided with a front chamfer.

7. The strongly water-resistant skeleton oil seal according to claim 1, characterized in that: The rubber outer circular oil seal (1) has a rear chamfer at its end edge.

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