Engine crankshaft oil seal structure

Abstract

The utility model discloses an engine crankshaft oil seal structure, which relates to the technical field of crankshaft oil seals. The key points of the technical solution are: it includes an oil seal body, a sealing lip with an L-shaped cross section is arranged at one end of the oil seal body, and a plurality of spiral guide grooves are arranged in an annular array on the side wall of the sealing portion of the sealing lip, and the spiral direction of the guide groove is opposite to the rotation direction of the crankshaft. The utility model arranges a guide groove and a guide groove on the sealing lip and the dustproof ear respectively, and the guide groove and the guide groove are both spirally arranged away from the sealing cavity and the spiral direction is opposite to the rotation direction of the crankshaft, so that the guide groove can reduce the leakage oil pressure at the oil seal, and the guide groove can scrape off the dust on the end of the crankshaft, thereby achieving the effect of sealing and dustproofing.

Description

Technical Field

[0001] The utility model relates to the technical field of crankshaft oil seals, and more specifically, to an engine crankshaft oil seal structure. Background Art

[0002] The crankshaft oil seal is the seal on the crankshaft head on the engine. Its main function is to prevent the oil in the cylinder from leaking out.

[0003] Generally, when the engine is operating, the friction between the oil seal and the crankshaft will convert mechanical energy into heat energy, causing the oil seal to heat up. However, the leakage pressure of the oil at the crankshaft and the oil seal cannot be reduced, and the oil seal itself has a certain degree of softness after heating, which in turn causes some oil to leak. The function of the crankshaft itself is not only to prevent oil leakage, but also to prevent external dust from entering the engine through the oil seal after the engine has been used for a long time. The mixture of dust and oil causes rotational friction damage to the engine crankshaft.

[0004] Therefore, a new solution needs to be proposed to solve this problem. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an engine crankshaft oil seal structure, by respectively arranging a guide groove and a guide groove on the sealing lip and the dustproof ear, the guide groove and the guide groove are both spirally arranged away from the sealing cavity and the spiral direction is opposite to the rotation direction of the crankshaft, so that the guide groove can reduce the leakage oil pressure at the oil seal, and at the same time the guide groove can scrape off the dust on the end of the crankshaft, thereby achieving the effect of sealing and dustproofing.

[0006] The above technical purpose of the utility model is achieved through the following technical scheme: an engine crankshaft oil seal structure, including an oil seal body, one end of the oil seal body is provided with a sealing lip with an L-shaped cross-section, and a plurality of spiral guide grooves are arranged in an annular array on the side wall of the sealing portion of the sealing lip, and the spiral direction of the guide groove is opposite to the crankshaft rotation direction.

[0007] Preferably, a dustproof ear is provided at the end of the oil seal away from the sealing lip, and a sealing cavity is formed between the dustproof ear and the sealing lip.

[0008] Preferably, a first limiting groove corresponding to the guide groove is arranged on one side of the sealing lip, and a first hoop spring is arranged in the limiting groove.

[0009] Preferably, the cross-section of the dustproof ear is L-shaped and is symmetrically arranged with the sealing lip, and the cross-sections of the oil seal body, the sealing lip and the dustproof ear are C-shaped.

[0010] Preferably, a spiral guide groove is provided in an annular array on the side wall of the dustproof portion of the dustproof ear, and the spiral direction of the guide groove is opposite to the rotation direction of the crankshaft.

[0011] Preferably, the guiding groove and the guide groove are both spirally arranged away from the limiting groove.

[0012] Preferably, a second limiting groove corresponding to the guide groove is arranged on one side of the dustproof ear, and a second hoop spring is arranged in the limiting groove.

[0013] The utility model has the following beneficial effects:

[0014] By providing a spiral guide groove on the sealing lip in the opposite direction to the rotation direction of the crankshaft, the side wall of the guide groove can scrape off the oil on the crankshaft when the crankshaft rotates because the spiral direction of the guide groove is opposite to the rotation direction of the driving crankshaft. Due to the spiral setting, the guide groove will continue to scrape off the oil on the crankshaft during the continuous rotation of the crankshaft, so that the oil in the guide groove always has a thrust to push the oil outward, thereby reducing the leakage pressure of the oil at the oil seal, thereby preventing oil leakage caused by the increase in pressure at the crankshaft oil seal when the engine is operating. At the same time, a spiral guide groove is provided on the dustproof ear in the opposite direction to the rotation direction of the crankshaft, so that when the crankshaft rotates, the principle is the same as above, and the side wall of the guide groove scrapes off the dust on the crankshaft, thereby achieving a dustproof effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The structure of the utility model is shown in FIG. Figure 1 ;

[0016] Figure 2 The structure of the utility model is shown in FIG. Figure 2 ;

[0017] Figure 3 It is a cross-sectional view of the utility model.

[0018] In the figure: 1. oil seal body; 2. sealing lip; 3. guide groove; 4. dustproof ear; 5. sealing cavity; 6. first limiting groove; 7. first hoop spring; 8. guide groove; 9. second limiting groove; 10. second hoop spring. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0020] An engine crankshaft oil seal structure, such as Figures 1 to 3As shown, it includes an oil seal body 1, and the two ends of the oil seal are integrally formed with a sealing lip 2 and a dustproof ear 4 in a symmetrical state. The cross-sections of the sealing lip 2 and the dustproof ear 4 are both L-shaped, and the cross-sections of the oil seal body 1, the sealing lip 2 and the dustproof ear 4 are C-shaped, so that a sealing cavity 5 is formed between the sealing lip 2 and the dustproof ear 4. The sealing part annular array corresponding to the sealing lip 2 and the crankshaft has a plurality of spiral guide grooves 3, and the dustproof ear 4 and the crankshaft The corresponding dustproof part annular array has a plurality of spiral guide grooves 8, and the guide grooves 3 and the guide grooves 8 are both spirally arranged away from the sealing cavity 5, and the spiral direction is opposite to the rotation direction of the crankshaft.

[0021] By setting a spiral guide groove 3 in the opposite direction of the crankshaft rotation on the sealing lip 2, the side wall of the guide groove 3 can scrape the oil on the crankshaft when the crankshaft rotates because the spiral direction of the guide groove 3 is opposite to the rotation direction of the driving crankshaft. Due to the spiral setting, the guide groove 3 will continue to scrape the oil on the crankshaft during the continuous rotation of the crankshaft, so that the oil in the guide groove 3 always has a thrust to push the oil outward, thereby reducing the leakage pressure of the oil at the oil seal, thereby preventing oil leakage caused by the increase in pressure at the crankshaft oil seal when the engine is operating. At the same time, a spiral guide groove 8 in the opposite direction of the crankshaft rotation is set on the dustproof ear 4, so that when the crankshaft rotates, the principle is the same as above, and the side wall of the guide groove 8 scrapes the dust on the crankshaft, thereby achieving a dust-proof effect. The setting of the sealing chamber 5 can store trace amounts of dust and leaked oil to prevent dust from directly entering the engine.

[0022] Furthermore, a first limiting groove 6 corresponding to the guide groove 3 is provided on one side of the sealing lip 2, and a first hoop spring 7 is provided in the limiting groove; a second limiting groove 9 corresponding to the guide groove 8 is provided on one side of the dustproof ear 4, and a second hoop spring 10 is provided in the limiting groove; the first hoop spring 7 arranged in the first limiting groove 6 and the second hoop spring 10 arranged in the second limiting groove 9 enable the first headband to ensure that the sealing lip 2 always fits tightly with the crankshaft through elastic force, and the sealing performance is strong; the second headband ensures that the dustproof ear 4 always fits tightly with the crankshaft through elastic force, and the dustproof performance is strong.

[0023] In summary:

[0024] By setting a spiral guide groove 3 in the opposite direction to the rotation direction of the crankshaft on the sealing lip 2, when the crankshaft rotates, the side wall of the guide groove 3 can scrape off the oil on the crankshaft because the spiral direction of the guide groove 3 is opposite to the rotation direction of the driving crankshaft. Due to the spiral setting, the guide groove 3 will continue to scrape off the oil on the crankshaft during the continuous rotation of the crankshaft, so that the oil in the guide groove 3 always has a thrust to push the oil outward, thereby reducing the leakage pressure of the oil at the oil seal, thereby preventing oil leakage caused by the increase in pressure at the crankshaft oil seal when the engine is operating. At the same time, a spiral guide groove 8 in the opposite direction to the rotation direction of the crankshaft is set on the dustproof ear 4, so that when the crankshaft rotates, the principle is the same as above, and the side wall of the guide groove 8 scrapes off the dust on the crankshaft, thereby achieving a dustproof effect.

[0025] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An engine crankshaft oil seal structure, characterized in that: The oil seal comprises an oil seal body (1), one end of which is provided with a sealing lip (2) with an L-shaped cross section, a plurality of spiral guide grooves (3) are arranged in an annular array on the side wall of the sealing portion of the sealing lip (2), and the spiral direction of the guide grooves (3) is opposite to the rotation direction of the crankshaft.

2. The engine crankshaft oil seal structure according to claim 1, characterized in that: A dustproof ear (4) is provided at the end of the oil seal away from the sealing lip (2), and a sealing cavity (5) is formed between the dustproof ear (4) and the sealing lip (2).

3. The engine crankshaft oil seal structure according to claim 2, characterized in that: A first limiting groove (6) corresponding to the guide groove (3) is arranged on one side of the sealing lip (2), and a first hoop spring (7) is arranged in the limiting groove.

4. The engine crankshaft oil seal structure according to claim 3, characterized in that: The cross section of the dustproof ear (4) is L-shaped and is symmetrically arranged with the sealing lip (2); the cross sections of the oil seal body (1), the sealing lip (2) and the dustproof ear (4) are C-shaped.

5. The engine crankshaft oil seal structure according to claim 4, characterized in that: A spiral guide groove (8) is provided in an annular array on the side wall of the dustproof portion of the dustproof ear (4), and the spiral direction of the guide groove (8) is opposite to the rotation direction of the crankshaft.

6. The engine crankshaft oil seal structure according to claim 5, characterized in that: The guiding groove (3) and the guide groove (8) are both spirally arranged away from the limiting groove.

7. The engine crankshaft oil seal structure according to claim 6, characterized in that: A second limiting groove (9) corresponding to the guide groove (8) is arranged on one side of the dustproof ear (4), and a second hoop spring (10) is arranged in the limiting groove.

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