KR20180059662A - Oil seal for industrial engine which is resistant to high pressures - Google Patents

Abstract

The present invention relates to an oil seal for a high-pressure industrial engine, and more particularly to an oil seal for a high-pressure industrial engine, which comprises a body made of steel and having a central through hole through which a shaft penetrating the engine room is formed, Wherein the main lip includes a plurality of projections formed along the inner periphery of the main lip and a plurality of helical grooves between the projections, A helical groove forming section having a thickness between an upper surface and a lower surface of the helical groove forming section and a helical groove forming section adjacent to the helical forming section and having a thickness shorter than the thickness of the helical groove forming section, Is a straight line section in which a line connecting the bottom surfaces of the plurality of projections is straight and a straight section in which a line connecting the bottom surfaces of the plurality of projections Wherein the helical groove non-uniformity section includes an end section in which a bottom surface is recessed toward the plurality of projections.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil seal for an industrial engine,

The present invention relates to an oil seal for a high-pressure industrial engine, and more particularly to an oil seal for a high-pressure industrial engine, which comprises a body made of steel and having a central through hole through which a shaft penetrating the engine room is formed, Wherein the main lip includes a plurality of projections formed along the inner periphery of the main lip and a plurality of helical grooves between the projections, A helical groove forming section having a thickness between an upper surface and a lower surface of the helical groove forming section and a helical groove forming section adjacent to the helical forming section and having a thickness shorter than the thickness of the helical groove forming section, Is a straight line section in which a line connecting the bottom surfaces of the plurality of projections is straight and a straight section in which a line connecting the bottom surfaces of the plurality of projections Wherein the helical groove non-uniformity section includes an end section in which a bottom surface is recessed toward the plurality of projections.

Hereinafter, the background art will be described with reference to the accompanying drawings.

1 is a cross-sectional view of a conventional engine oil seal.

Generally, the engine room is filled with oil, and the shaft 100 is configured to rotate through the engine room. At this time, an oil seal 500 for engine is interposed between the shaft 100 and the engine room to prevent the oil from leaking.

The engine oil seal 500 includes a body 300 having a circular ring as a whole and a through hole formed at a central portion thereof. The oil seal 500 includes a tube 300 extending from the through hole of the body 300 toward the rear Shaped main lips 200 and a cover 400 covering the outer surface of the body 300. [

In addition, a plurality of spiral grooves are formed on the inner surface of the main lip 200.

Problems of the conventional engine oil seal 500 will be described below.

In the case of the conventional engine oil seal 500, since the material constituting the main lip is made of PTFE having low elasticity, the pumping force of the oil in the spiral groove due to the rotation of the shaft 100 in the engine stop state is lost, There is a disadvantage in that the outer circumferential surface of the sealing member 100 can not be completely sealed.

1, when the high pressure is generated in the engine, the main lip 200 is subjected to a force as shown in FIG. 1 due to the high pressure generated. However, since there is a space between the main lip 200 and the shaft 100, The lip 200 is bent toward such a space so that the end portion of the main lip 200 is lifted and the waist 200-1 of the main lip 200 is excessively worn The high-pressure industrial engine oil seal used in harsh environments (high pressure) such as an industrial engine has a problem of deteriorating its performance.

Korean Registered Patent No. 10-1579957 (Dec. 17, 2015)

SUMMARY OF THE INVENTION It is an object of the present invention to provide an oil seal for a high-pressure and high-pressure industrial engine that has improved performance over conventional engine oil seals.

The present invention has the following features in order to achieve the above object.

According to a preferred embodiment of the present invention, there is provided an oil seal for a high-pressure industrial engine, which comprises a body made of steel and having a through hole through which a shaft penetrating the engine room is formed at a central portion thereof, Wherein the main lip includes a plurality of projections formed along the inner periphery of the main lip and a plurality of helical grooves between the projections and a helical groove having the same thickness between the upper surface and the lower surface of the projections And a spiral groove forming section adjacent to the spiral groove forming section, the spiral groove forming section having a thickness shorter than the thickness of the spiral groove forming section, wherein the spiral groove forming section has a straight line connecting the bottom faces of the plurality of projections And a slope section inclined toward the upper surface of the plurality of projections with respect to the straight section and the straight section, Home aplasia period is characterized in that the bottom comprises a single this diagnosis section is recessed toward the plurality of projections.

The depth of the plurality of helical grooves formed in the main lip is equal to each other in the straight section, but becomes gradually shorter toward the helical groove amorphous section or toward the end of the main lip in the inclined section.

Wherein a depth of the spiral groove of the linear section is 0.2 to 0.3 mm, a depth of the spiral groove of the slant section is 0.1 to 0.2 mm, a thickness of the spiral groove non-uniformity section is 0.5 to 0.7 mm, And the length is 0.5-1.0 mm.

And an angle formed between an extension of a line connecting the bottom surfaces of the plurality of protrusions and an inclined surface of the inclined section is 1-4 degrees.

According to the present invention, it is possible to improve the pressure resistance of the conventional engine oil seal, improve the sealing property at rest, change the shape and size of the product according to the customer's demand, and apply the effect even in a high- have.

1 is a sectional view of a conventional engine oil seal.
2 is a cross-sectional view of a high pressure, robust industrial engine oil seal according to a preferred embodiment of the present invention.
Fig. 3 is a cross-sectional view showing a state in which an oil seal for an industrial engine, which is robust against high pressure in Fig. 2, is mounted on a shaft.
4 is a detailed view of the main lip shown in part A of Fig.
5 is a view showing the main lip of FIG. 4 in a state in which the interval display is excluded.
Fig. 6 is a cutaway perspective view of the oil seal for an industrial engine, which is robust against high pressure in Fig. 2;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. For the sake of convenience, the size, line thickness, and the like of the components shown in the drawings referenced in the description of the present invention may be exaggerated somewhat. The terms used in the description of the present invention are defined in consideration of the functions of the present invention, and thus may be changed depending on the user, the intention of the operator, customs, and the like. Therefore, the definition of this term should be based on the contents of this specification as a whole.

FIG. 2 is a cross-sectional view of an oil seal for a high-pressure and robust industrial engine according to a preferred embodiment of the present invention, FIG. 3 is a sectional view showing a state in which an oil seal for an industrial engine, 2 is a detail view of the main lip shown in Part A of Fig. 2, Fig. 5 is a view showing the main lip of Fig. 4 without the section indication, Fig. 6 is a cut- to be.

2 to 6, an oil seal for a high-pressure and robust industrial engine according to a preferred embodiment of the present invention includes a body 30, a main lip 20, and a cover 40.

The body 30 is formed with a through hole 60 through which a shaft 10 passing through the engine room passes.

The main lip 20 extends in a tubular shape rearward along the periphery of the through hole 60. The main lip 20 has a plurality of projections 20-4 formed along the inner periphery of the main lip 20, A spiral groove forming section 20-1 including a plurality of helical grooves 20-8 between the upper surface and the lower surface 20-7 of the protrusion 20-4 and having the same thickness between the upper surface and the lower surface 20-7, And a helical groove non-forming section (20-2) adjacent to the helical groove forming section and having a thickness shorter than the thickness of the helical groove forming section (20-2).

Here, the helical groove forming section 20-1 has a straight section 20-5 in which the line connecting the bottom surfaces of the plurality of projections 20-4 is straight and a plurality of projections The spiral groove non-uniformity section 20-2 includes an inclined section 20-6 inclined toward the upper surface of the step 20-4, -3). Therefore, the depths of the plurality of spiral grooves 20-8 formed in the main lip 20 are the same in the straight line section 20-5 but different in the slant section 20-6. For example, the spiral groove non- -2) or toward the end of the main lip 20.

Since the spiral groove non-forming section 20-2 includes the end section 20-3 whose bottom surface is concave toward the plurality of projections 20-4, the thickness of the spiral groove forming section 20-1 And has a shorter thickness.

The cover 40 covers the outer surface of the steel body 30 and can be made of PTFE and the main lip 20 can be made of PTFE and the cover 40 is made of PTFE, 20 may be made of other materials and the main lip 20 is made of PTFE, but the cover 40 may be made of other materials.

The main lip (20) and the cover (40) are bonded to a steel body (30).

In the oil seal for an industrial engine which is robust against high pressure according to the preferred embodiment of the present invention, the depth of the spiral groove of the straight section 20-5 is 02. to 0.3 mm, the depth of the spiral groove of the slope section 20-6 The thickness of the helical groove intangible section 20-2 is 0.5 to 0.7 mm, the length of the spiral groove intangible section 20-2 is 0.5-1.0 mm, the number of the projections 20-4 And the inclined surface of the inclined section 20-6 is 1-4 degrees, the pressure resistance is improved by 100% or more and the stationary state sealing property is improved by 40% or more when compared with the conventional engine oil seal. And it is possible to change the shape and size of the product according to the demand of the customer and it can be applied even in a severe (high pressure) operating environment such as an industrial engine.

Hereinafter, actions and effects according to the preferred embodiment of the present invention will be described.

When the high pressure is generated in the engine, the main lip 20 receives a force from its waist portion due to the high pressure generated. The space 20A is formed between the main lip 20 and the shaft 10 so that the PTFE material The main lip 20 is bent toward such a space 20A and accordingly the end portion of the main lip 20, for example, the inclined section 20-6 and the spiral groove 20-3 including the end section 20-3, The incompressible section 20-2 is integrally formed as a part of the main lip 20 to receive the force to be heard but the incline section 20-6 is inclined and the spiral groove intact section 20-2 is formed in the short section 20- 3 so that the inclined section 20-6 and the helical groove intangible section 20-7 are formed in the engine room because they are shaped and structured to be more warped and adhered to the shaft 10 by the pressure in the engine room. 2 can be brought into close contact with the shaft 10 to maintain the sealability. Therefore, it is possible to prevent the wear of the specific portion of the main lip 20, for example, the waist portion 20W, as a result, the pressure resistance of the main lip 20 can be improved, .

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. .

10: shaft 20: main lip
20-1: Spiral groove forming section 20-2: Spiral groove forming section
20-3: Short section 20-4: projection
20-5: straight line section 20-6: slope section
20-7: bottom 20-8: spiral groove
30: steel body 40: cover
50: Oil seal for high-pressure and robust industrial engine 60: Through hole

Claims (4)

A body 30 made of steel and formed with a through hole 60 through which a shaft 10 penetrating an engine room is formed at a central portion thereof and a main lip 40 extending rearward along a circumference of the through hole 60 20,
The main lip 20 includes a plurality of projections 20-4 formed along the inner periphery of the main lip 20 and a plurality of helical grooves 20-8 between the projections 20-4 A spiral groove forming section 20-1 in which the thickness between the upper surface of the protrusion 20-4 and the lower surface 20-7 is formed to be equal to the thickness of the helical groove forming section 20-1, And a spiral groove non-uniformity section 20-2 having a shorter thickness,
The helical groove forming section 20-1 has a linear section 20-5 in which a line connecting the bottom surfaces of the plurality of protrusions 20-4 is straight and a plurality of protrusions 20-4 in the linear section 20-5, And an inclined section 20-6 inclined toward the upper surface of the upper surface 20-4,
Characterized in that the helical groove intrinsic section (20-2) includes an end section (20-3) whose bottom surface is recessed toward the plurality of protrusions (20-4). The method according to claim 1,
The depths of the plurality of helical grooves 20-8 formed in the main lip 20 are equal to each other in the straight line section 20-5 but in the inclined section 20-6 toward the helical groove amorphous section 20-2 And gradually decreases toward the end of the main lip (20). The method according to claim 1,
The depth of the spiral groove of the straight section 20-5 is 0.2 to 0.3 mm and the depth of the spiral groove of the slope section 20-6 is 0.1 to 0.2 mm. Is 0.5 to 0.7 mm in thickness, and the length of the helical groove intangible section (20-2) is 0.5 to 1.0 mm. The method of claim 3,
And an angle formed by an extension of a line connecting the bottom surface of the plurality of protrusions (20-4) and an inclined surface of the inclined section (20-6) is 1-4 deg..

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