KR200374257Y1 - Plain contact structure of gasket for cylinder head cover - Google Patents

Abstract

According to the surface contact structure between the gasket groove of the cylinder head cover and the contact surface of the cylinder head, the present invention can improve the followability against deformation of the cylinder head cover, prevent the fall of the gasket and maintain the surface pressure. An object of the present invention is to provide a surface contact structure of a gasket for a cylinder head cover which can prevent oil leakage in advance by increasing resistance to vertical behavior.

The surface contact structure of the gasket for the cylinder head cover of the present invention is disposed between the gasket groove 31 of the automobile cylinder head cover 30 and the contact surface of the cylinder head 3, and is relatively larger than the depth of the gasket groove 31. It has a large height but forms a lower surface (23, 24) of the cross-sectional shape of the downwardly extending cross-sectional shape in the middle of both sides, respectively, and includes a relatively narrow upper portion 21 and a relatively wide lower portion 25, the head cover The upper surface 22 and the lower surface 26 of the lower portion 25 of the upper portion 21 are formed in the shape of a smooth surface to counteract the behavior caused by the deformation of the 30, so that the surface pressure can be uniformly formed, and the head cover It has improved resistance according to the deformation of 30.

Description

PLAIN CONTACT STRUCTURE OF GASKET FOR CYLINDER HEAD COVER}

The present invention relates to the surface contact structure of the gasket for the cylinder head cover, gasket groove (gasket groove) due to factors such as thermal stress due to the operation of the vehicle engine, vertical behavior in the vertical direction of the cylinder head cover, horizontal behavior in the left and right directions, etc. And a gasket coupled between the contact surface of the cylinder head and the surface contact structure of the gasket for the cylinder head cover corresponding to a shape structural technique for preventing the gasket from falling down in the gasket groove.

Recently, with the reduction in the weight and performance of automobile engines (hereinafter, referred to as 'engines'), the demand for lightening of each engine component is also increasing.

In this case, the cylinder head cover gasket (hereinafter referred to as 'gasket') in the engine is interposed between the cylinder head (hereinafter referred to as 'head') and the cylinder head cover (hereinafter referred to as 'cover') of the engine and It should be designed and manufactured to prevent leakage of engine oil even under extreme operating conditions (-40 ℃ to + 150 ℃).

Despite these demands for lightweighting and extreme operating conditions, cylinder head covers are currently being developed from ordinary plastics and engineering plastics.

As shown in FIG. 1, a typical engine accommodates a gasket 2 made of rubber material inside the lower rim of the cover 1, and the upper part of the engine block with the cover 1 accommodating and interposing the gasket 2. It is superimposed on the upper surface of the head (3) located in, and then has a coupling structure that is fixed through a medium such as a plurality of bolts (4) and the like.

Referring to FIGS. 2A and 2B, the shapes of the conventional gasket 2 and the gasket groove 5 positioned on the cover 1 are as follows.

The conventional gasket 2 has a simple rounded rectangular cross section, which is generally referred to as a 'straight' or 'I' type, and has ribs (2a, 2b: ribs) on the top and bottom to prevent oil from leaking out. To form.

The gasket groove 5 or the gasket groove has a predetermined volume to which the gasket 2 can be mounted, but has a 'c' cross-sectional shape in which the opened side faces downward.

At this time, the operating environment and conditions of the engine are normally between the ambient temperature of -40 ° C and the ambient temperature of the engine room + 150 ° C, and expansion and contraction inevitably occur due to heat (or thermal stress).

In particular, since the cover 1 is made of a plastic material in accordance with the demand for weight reduction, the deformation or vertical / horizontal behavior is generated at the above temperature.

That is, the head 3 and the cover 1, which are combined treatments during the operation of the engine, also repeat the expansion and contraction, so that when viewed minutely, the minute movement (hereinafter, the three parts (head, cover, gasket) in contact with each other in the same place) (Behavior) is acting in the left-right direction (horizontal direction) and up-down direction (vertical direction) (a, b).

That is, the head 3 is contracted at low temperature so that vertical and horizontal behavior is generated to move downward and in the engine direction and upward and at high temperature in the engine direction.

In addition, the cover 1 is contracted at low temperature and expands in the upward and engine directions, expands at high temperature, and horizontal and vertical behavior is generated in the downward and engine outward directions as indicated by reference numerals 'a' and 'b'.

In addition, the rubber gasket (2) is the expansion and contraction phenomenon occurs at high temperature, low temperature, and when the horizontal behavior occurs to the right as shown in Figure 2b, the lower part of the gasket (2) to the left, the cover (1) The oil filled in the interior of the oil leaks to the outside (c) occurs.

In addition, a gasket (not shown) according to another conventional technique has only an inverted 'T' or inverted 'Y' shaped cross-sectional shape, and no gasket hole is formed corresponding to the cross-sectional shape.

For this reason, it is virtually impossible to insert the lower portion of the cross section such as the 'T' into the gasket hole so that the upper portion of the cross section such as the 'T' is hermetically adhered to the inside of the gasket groove.

In this case, a problem arises in that the upper portion of the gasket made of rubber material is not sufficiently filled inside the gasket groove. This leads to enormous obstacles to confidentiality.

In addition, in order to solve the above problems, when the cover and the head are brought into close contact by excessively tightening the medium chain bolt, etc., the load is applied to the lower portion of the end face of the inverse 'T' or the like and the opening of the gasket groove between the cover and the head. As this is excessively applied, there is still a problem that a crack occurs.

Therefore, an object of the present invention for solving the above-mentioned problems is to improve the followability to deformation of the cylinder head cover, according to the surface contact structure between the gasket groove of the cylinder head cover and the contact surface of the cylinder head, The present invention provides a surface contact structure of a gasket for a cylinder head cover that can prevent falling and maintain surface pressure, and can prevent oil leakage by increasing resistance to horizontal and vertical behavior.

In addition, to achieve the other object of the present invention by varying the structure of the smooth contact surface and the inclined surface, the width of the upper and lower in a shape for preventing the fall of the gasket due to factors such as horizontal behavior.

1 is a perspective view illustrating an engine equipped with a general cylinder head cover and a gasket thereof;

2A and 2B are cross-sectional views taken along the line A-A 'shown in FIG. 1 to illustrate the cross-sectional shape of a gasket for a cylinder head cover according to the prior art;

Figure 3 is a perspective view and an enlarged cross-sectional view for explaining the surface contact structure of the gasket for the cylinder head cover according to an embodiment of the present invention,

4A and 4B are cross-sectional views for explaining the use state of the gasket for the cylinder head cover having the surface contact structure shown in FIG.

<Description of the symbols for the main parts of the drawings>

20: gasket 21: upper

23, 24: cloth 25: lower part

30: cylinder head cover 31: gasket groove

An object of the present invention as described above is a surface contact structure of a gasket groove for the cylinder head cover disposed between the gasket groove of the automobile cylinder head cover and the contact surface of the cylinder head, and has a height that is relatively greater than the depth of the gasket groove. A lower surface of the upper surface and the lower surface of the upper surface and the lower surface are formed so as to form a cloth surface having a downwardly expanded cross-sectional shape in the middle of both sides so as to counter the behavior according to the deformation of the head cover. It is achieved by the surface contact structure of the cylinder head cover gasket characterized by being formed in this smooth surface shape.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 3 to 4B.

In the drawings, Figure 3 is a perspective view and an enlarged cross-sectional view for explaining the surface contact structure of the gasket for the cylinder head cover according to an embodiment of the present invention, Figures 4a and 4b has a surface contact structure shown in FIG. Sectional drawing for demonstrating the use condition of the gasket for cylinder head cover.

Referring to FIG. 3, the surface contact structure of the gasket for the cylinder head cover in the present invention is realized by the gasket 20 having the cross-sectional shape as follows. Such a gasket 20 is used by being seated in the gasket groove of the cover (head cover).

At this time, the gasket 20 has a structure that is in surface contact with the surface of the head (cylinder head), and eventually is uniform when the cylinder head cover made of plastic material exhibits horizontal / vertical behavior according to thermal stress, vibration, etc. As the surface pressure shape is achieved, direct and improved followability is achieved.

To this end, the gasket 20 disclosed in the present invention has an integral top 21 and bottom 25 formed of a conventional gasket material.

The gasket 20 has a height that is relatively larger than the depth of the gasket groove of the cover, and has a cloth surface 23 and 24 having a downwardly expanded cross-sectional shape on both sides of the middle portion of the upper portion 21 and the lower portion 25, respectively. .

In addition, the gasket 20 has a top surface 22 and a bottom surface 26 of the bottom 25 of the upper portion 21 is formed in a smooth surface shape, accordingly the surface contact structure of the above-mentioned gasket for the cylinder head cover Will have

At this time, the width of the upper portion 21 of the gasket 20 is relatively smaller than the width of the lower portion 25, wherein the width of the lower portion 25 corresponds to the width of the gasket groove of the cover It is desirable to have.

Therefore, in the gasket groove of the cover, a minute gap corresponding to the difference in width between the upper portion 21 and the lower portion 25 is formed between both sides of the upper portion 21 of the gasket 20 and the inner side surface of the gasket groove of the cover. Done.

Particularly, inclined surfaces 22a and 22b in the form of chamfers are formed at both corners on the basis of the cross section of the upper portion 21 of the gasket 20, and inclined surfaces are also provided at both edges of the lower portion 25 of the gasket 20 in the same manner. 26a and 26b are formed.

Normally, the inclined surfaces 22a, 22b, 26a, and 26b of the gasket 20 are not in contact with the edge of the gasket groove and the surface of the head, and an external force corresponding to the deformation of the cylinder head cover made of plastic material may act on the gasket 20. At this time, the surface contact state is further provided to either the edge side surface of the gasket groove or the surface of the head.

Accordingly, the gasket 20 is deformed and compressed corresponding to the deformation of the head cover.

At this time, for example, any one of the inclined surface (26a) is to increase the contact area relatively on the same surface as the lower surface 26 of the lower portion 25, the uniform and increased surface pressure by this increased area gasket ( 20) and the surface of the head 3.

As a result, such uniform and increased surface pressure greatly helps to improve the sealability of the gasket 20.

Hereinafter, the mounting state and the use state of the gasket for the cylinder head cover according to the present invention will be described.

As shown in FIGS. 4A and 4B, the gasket groove 31 of the head cover 30 on which the gasket 20 of the present invention is to be seated has a width slightly wider than that of the upper portion 21 of the gasket 20. It has, but has an inner space that can be in close contact with a portion of the lower portion 25 corresponding to the width of the lower portion (25).

In the internal space of the gasket 20, when the gasket 20 of the present invention is mounted, a micro gap corresponding to the difference in the width lengths of the upper portion 21 and the lower portion 25 is present.

The upper surface 22 of the gasket 20 is in surface contact with the inner surface of the gasket groove 31, and the lower surface 26 of the gasket 20 also faces the surface of the head 3 (for example, the head cover side). And the contact surface of the head in contact with the lower surface of the gasket.

Since the gasket 20 in contact with the surface has a bearing force proportional to the surface contact against such deformation and behavior when the deformation and vertical / horizontal behavior of the head cover 30 are caused by thermal stress, the deformation is eventually caused. And while having improved resistance to behavior while preventing the fall of the gasket 20 itself.

In addition, the gasket 20 may include the gasket 20 together with the lower surface 26 of all or part of the inclined surfaces 26a and 26b of both edges of the lower part 25, even if bending deformation occurs in accordance with the deformation and behavior. By contacting this surface without falling down, it is possible to maintain more airtightness with improved resistance.

In the present invention configured as described above, since the upper part of the short width and the lower part of the long width are integrally formed, and the upper and lower surfaces thereof are formed as a smooth surface, the gasket itself can be prevented from falling down, and the head cover is not deformed. There is an effect that the surface contact structure of the gasket for the cylinder head cover can be provided that can provide further improved resistance.

In such a surface contact structure of the gasket for a cylinder head cover of the present invention, the inclined surfaces formed at the edges of the gasket have an advantage of greatly improving the sealing performance of the gasket by generating a uniform and increased surface pressure. .

Claims (4)

In the surface contact structure of the cylinder head cover gasket 20 disposed between the gasket groove 31 of the automobile cylinder head cover 30 and the contact surface of the cylinder head 3, It has a relatively larger height than the depth of the gasket groove 31, but forms a lower surface (23, 24) of the downwardly expanded cross-sectional shape in the middle of both sides, respectively, the relatively narrow upper portion 21 and the wider width Including a lower portion 25, For the cylinder head cover, characterized in that the upper surface 22 and the lower surface 26 of the lower portion 25 of the upper portion 21 is formed in a smooth surface shape to counteract the behavior caused by the deformation of the head cover 30. Gasket surface contact structure. The method of claim 1, When the gasket 20 is deformed according to the behavior of the head cover 30, the inclined surfaces 26a and 26b are formed at both edges of the lower portion 25 so as to be in agreement with the lower surface 26 to induce uniform surface pressure. Surface contact structure of the gasket for a cylinder head cover, characterized in that each is formed. The method of claim 1, The gasket 20 is inclined surface 22a at both edges of the upper portion 21 to induce uniform surface pressure in accordance with the upper surface 22 during deformation due to the deformation of the head cover 30. And 22b), each of which is a surface contact structure of a gasket for a cylinder head cover. The method of claim 1, The width of the lower portion 25 of the gasket 20 has a size corresponding to the width of the gasket groove 31, and the width of the upper portion 21 of the gasket 20 is the lower portion 25. As smaller than the width of, the fine corresponding to the difference in the width of the upper portion 21 and the lower portion 25 between the both sides of the upper portion 21 of the gasket 20 and the inner surface of the gasket groove 31 Surface contact structure of the gasket for cylinder head cover, characterized in that the gap is formed.