Axial sealing crankshaft oil seal with spring on lip

Abstract

The utility model relates to an axial sealing crankshaft oil seal with a spring on a lip, which comprises an outer oil seal and an inner framework, the outer oil seal comprises an outer framework and a rubber body coated on the outer framework, a sealing lip is arranged on the inner side of the rubber body, a spring is arranged on the outer side of the sealing lip, and the sealing lip is in interference fit with the end face of the inner framework and is in sealing contact with the end face of the inner framework; the vertical surface of the inner framework is sleeved on the crankshaft to form static seal; an obliquely-arranged oil return line is arranged on the upper circumference of the sealing face of the sealing lip, the bottom of the oil return line is connected with the sealing face of the sealing lip, a static sealing ring is arranged above the oil return line, and the bottom of the static sealing ring is connected with the oil return line and the sealing face of the sealing lip. The protruding height of the static sealing ring is the same as that of the oil return line. By the adoption of the technical scheme, oil leakage of the engine in the static or inclined state can be effectively prevented, the pumping effect of the engine in the running process is not affected, and the effective sealing effect can be guaranteed no matter the engine is in the static or working state.

Description

Technical Field

[0001] The utility model relates to the technical field of engine oil seals, in particular to an axial sealing crankshaft oil seal with a spring on the lip. Background Technique

[0002] The lip of the existing axial sealing oil seal for the engine crankshaft usually has an inclined oil return line. When the engine is working, the oil at the sealing surface is pumped back into the engine interior under the action of hydrodynamic pressure, effectively preventing the leakage of engine oil. When the engine does not run for a long time or is stationary on an inclined road surface, since the oil return line of the lip is in a raised strip shape and runs through the lip sealing surface, a gap is formed between the sealing surface and the inner skeleton end face. When the engine is in a stationary state, the oil return line cannot form a reaction force to pump the leaked engine oil, and the engine oil will leak along the gap to the outside of the engine, causing a leakage risk. Summary of the Invention

[0003] In order to solve the above-mentioned existing technical problems, the utility model provides an axial sealing crankshaft oil seal with a spring on the lip.

[0004] The technical solution adopted by the utility model is: an axial sealing crankshaft oil seal with a spring on the lip, which includes an outer oil seal and an inner skeleton. The outer oil seal includes an outer skeleton and a rubber body coated on the outer skeleton. A sealing lip is arranged on the inner side of the rubber body, and a spring is arranged on the outer side of the sealing lip. The sealing lip is in interference fit and sealing contact with the end face of the inner skeleton; the vertical surface of the inner skeleton is sleeved on the crankshaft to form a static seal; an inclined arrangement of oil return lines is arranged on the circumference of the sealing surface of the sealing lip, the bottom of the oil return line is connected to the sealing surface of the sealing lip, a static sealing ring is arranged above the oil return line, the bottom of the static sealing ring is connected to the oil return line and the sealing surface of the sealing lip, and the raised height of the static sealing ring is the same as the raised height of the oil return line.

[0005] A further technical solution of the utility model is: the raised height of the oil return line and the static sealing ring is 0.05 mm, so that the sealing surface can not only play a role in static oil sealing, but also does not affect the pumping action during work.

[0006] A further technical solution of the utility model is: the outer oil seal includes a dust-proof pad, the dust-proof pad is arranged at the outer end face of the outer oil seal, and the inner side of the dust-proof pad is in interference fit with the outer side wall of the inner skeleton, playing a role in dust prevention and preventing external dust from entering the sealing surface and causing the oil seal to fail and leak oil.

[0007] The beneficial effects of the present utility model are as follows: Due to the adoption of the above technical solution, for an axial sealing crankshaft oil seal with a lip and a spring of the present utility model, a static sealing ring is provided on the oil return line, which can effectively prevent oil leakage when the engine is stationary or tilted, and does not affect the pumping effect during engine operation. Whether the engine is stationary or working, an effective sealing effect can be ensured. Brief Description of the Drawings

[0008] Figure 1 is a schematic structural diagram of an axial sealing crankshaft oil seal with a lip and a spring according to the present utility model;

[0009] Figure 2 is a schematic cross-sectional structural diagram of the outer oil seal according to the present utility model;

[0010] Figure 3 is a schematic structural diagram of the inner skeleton according to the present utility model;

[0011] Figure 4 is a schematic structural diagram of the oil return line in the background art;

[0012] Figure 5 is a schematic structural diagram of the oil return line and the static sealing ring. Detailed Description of the Preferred Embodiments

[0013] The present utility model will be further described below in conjunction with the drawings and specific embodiments.

[0014] Embodiment:

[0015] As Figures 1 to 5 shown, an axial sealing crankshaft oil seal with a lip and a spring includes an outer oil seal 1 and an inner skeleton 2. The outer oil seal includes an outer skeleton 13 and a rubber body 12 wrapped around the outer skeleton. A sealing lip 15 is provided inside the rubber body, and a spring 14 is provided outside the sealing lip. The sealing lip is in interference fit and sealing contact with the end face 23 of the inner skeleton; the vertical surface 22 of the inner skeleton 2 is sleeved on the crankshaft to form a static seal; an oil return line 17 arranged obliquely is provided on the circumferential circle of the sealing surface of the sealing lip 15. The bottom of the oil return line is connected to the sealing surface of the sealing lip. A static sealing ring 16 is provided above the oil return line. The bottom of the static sealing ring is connected to the oil return line and the sealing surface of the sealing lip. The protruding height of the static sealing ring is the same as that of the oil return line.

[0016] Furthermore, the protruding height of the oil return line and the static sealing ring is 0.05 mm.

[0017] Furthermore, the outer oil seal includes a dust-proof pad 11. The dust-proof pad is provided at the outer end face of the outer oil seal, and the inner side of the dust-proof pad is in interference fit with the outer side wall 21 of the inner skeleton.

[0018] Further, the bottom of the oil return line and the sealing surface of the sealing lip are integrally connected.

[0019] Further, the bottom of the static seal ring, the oil return line and the sealing surface of the sealing lip are integrally connected.

[0020] In the present utility model, the inner skeleton and the sealing lip of the outer oil seal are in interference fit to play the role of main seal; a spring is arranged outside the sealing lip to reduce the dependence of the product on the aging characteristics of rubber and increase the service life; an oil return line is arranged on the sealing surface of the sealing lip to pump engine oil during operation; meanwhile, a static seal ring is arranged on the oil return line to effectively prevent engine oil leakage when the engine is in a static state; the static seal ring and the oil return line have the same protrusion height, and the optimal setting is 0.05 mm, so that the sealing surface can play the role of static oil sealing without affecting the pumping effect during operation; the sealing lip, the static seal ring and the oil return line are vulcanized and formed at the same time, which is easy for production; the dust-proof pads of the inner skeleton and the outer oil seal are in interference fit to prevent external dust from entering the sealing surface and causing oil leakage due to the failure of the oil seal, playing the role of dust prevention.

[0021] The structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limiting conditions under which the present utility model can be implemented. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of description and are not used to limit the scope under which the present utility model can be implemented. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope under which the present utility model can be implemented.

[0022] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. An axial-sealing crankshaft oil seal with a spring at the lip, characterized in that: It includes an outer oil seal and an inner skeleton. The outer oil seal includes an outer skeleton and a rubber body coated on the outer skeleton. A sealing lip is provided on the inner side of the rubber body, and a spring is provided outside the sealing lip. The sealing lip is in interference fit and sealed contact with the end face of the inner skeleton; the vertical surface of the inner skeleton is sleeved on the crankshaft to form a static seal; an oil return line arranged obliquely is provided on the circumference of the sealing surface of the sealing lip, the bottom of the oil return line is connected to the sealing surface of the sealing lip, a static sealing ring is provided above the oil return line, the bottom of the static sealing ring is connected to the oil return line and the sealing surface of the sealing lip, and the protrusion height of the static sealing ring is the same as the protrusion height of the oil return line.

2. The axial sealing crankshaft oil seal with a spring at the lip according to claim 1, characterized in that: The protrusion height of the oil return line and the static sealing ring is 0.05 mm.

3. An axial sealing crankshaft oil seal with a lip and a spring according to claim 1 or 2, characterized in that: The outer oil seal includes a dust-proof pad, the dust-proof pad is arranged at the outer end face of the outer oil seal, and the inner side of the dust-proof pad is in interference fit with the outer side wall of the inner skeleton.

4. An axial sealing crankshaft oil seal with a lip and a spring according to claim 1 or 2, characterized in that: The bottom of the oil return line and the sealing surface of the sealing lip are integrally connected.

5. An axial sealing crankshaft oil seal with a lip and a spring according to claim 1 or 2, characterized in that: The bottom of the static sealing ring and the oil return line and the sealing surface of the sealing lip are integrally connected.

Images