KR200345161Y1 - Structure of preventing cylinder head cover gasket from falling down - Google Patents

Abstract

The present invention provides a gasket for a cylinder head cover having an inclined surface, and by forming a gasket groove having a cover inclined surface corresponding to the inclined surface in the cylinder head cover, thereby preventing the gasket from falling down and maintaining surface pressure while preventing oil leakage. It is intended to provide a fall prevention structure of a gasket for a cylinder head cover.

The fall prevention structure of the gasket for cylinder head cover of the present invention is disposed in the gasket groove 50 having a cross-sectional shape of the 'c' shaped to face the opening side downwards, so that the inside of the gasket groove 50 is full. The upper portion 21 has a central portion 22 having a 'straight' volume 21 so as to be filled, and having inclined surfaces 22a and 22b with a predetermined gradient on both sides with respect to the axis of the upper portion 21. A gasket 20 integrally formed at the bottom of the gasket; Cover inclined surfaces 52a and 52b corresponding to the inclined surfaces 22a and 22b of the gasket 20 are formed in the opened portion of the gasket groove 50, and the inclined surfaces 22a and 22b and the cover inclined surface ( The gasket 20 is seated in the gasket groove 50 in a state of being in surface contact through 52a and 52b.

Description

Falling prevention structure of the gasket for the cylinder head cover {STRUCTURE OF PREVENTING CYLINDER HEAD COVER GASKET FROM FALLING DOWN}

The present invention relates to a fall prevention structure of a gasket for a cylinder head cover, and when the gasket is mounted and used in a gasket groove, the vertical behavior of the cylinder head cover or the horizontal behavior and thermal stress in the left and right directions In accordance with the present invention, there is provided a fall prevention structure of a gasket for a cylinder head cover which prevents the gasket from falling down in the gasket groove.

The cylinder head cover gasket (hereinafter referred to as the 'gasket') of an automotive engine (hereinafter referred to as the 'engine') is the cylinder head (hereinafter referred to as the 'head') and the cylinder head cover (hereinafter referred to as 'cover') of the engine. It should be designed and manufactured for the purpose of preventing leakage of engine oil even under extreme operating conditions (-40 ℃ ~ + 150 ℃) of the engine.

As shown in FIG. 1, a typical engine accommodates a gasket 2 made of a rubber material inside the rim of the cover 1, but is positioned above the engine block while the cover 1 receives and interposes the gasket 2. It has a coupling structure that is superimposed on the upper surface of the located head 3 and then 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, and has a cross-sectional shape of the letter 'C' that is set to face downward in the open side.

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).

Accordingly, 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 in detail, the microscopic movement of the three parts (head, cover, gasket) in contact with each other in the same place is performed. Hereinafter, behavior) acts 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 and vertical and horizontal behavior is generated to move downward and in the engine direction and upward and at high temperature in the outward direction of the engine.

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

On the other hand, the rubber gasket 2 also causes expansion and contraction at high and low temperatures (c, d).

However, unlike the cover 1 and the head 3, the cylinder head cover gasket 2 according to the related art is relatively weak in rigidity, and is exposed by a repeated thermal environment, and is indicated by a dotted line in FIG. 2B. As described above, an external force is applied in the bending direction so that the collapse occurs.

By the way, the cylinder head cover gasket 2 of the prior art is assembled at an initial stage and in an upright state to generate surface pressure in the up and down direction, thereby counteracting the pressure difference between the cover 1 and the outside (atmospheric pressure action). Although it was intended to prevent the oil 6 inside the cover 1 from leaking to the outside, the oil (at some places where the surface pressure applied to the gasket 2 was reduced due to the inevitable collapse phenomenon caused by engine operation). 6) has a fatal disadvantage that can leak to the outside.

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 or the like, 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.

Accordingly, an object of the present invention for solving the above-mentioned problems is to provide a gasket for a cylinder head cover having a shape of upper and lower light in a predetermined gradient, and to form a gasket groove having an inclined surface corresponding to the gradient in the cylinder head cover. By this, not only the upper part of the gasket can be filled to the inside of the gasket groove, but also the cylinder head can prevent the fall of the gasket, maintain the surface pressure of the gasket, and solve the problem of oil leakage at once. It is to provide a fall prevention structure of the cover gasket.

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 explain the cross-sectional shape of the gasket groove and gasket groove for the cylinder head cover according to the prior art;

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

4 is a cross-sectional view for explaining a state in which the gasket for the cylinder head cover having the anti-fall structure shown in FIG. 3 is mounted in the gasket groove having the anti-fall structure.

5 to 7 are cross-sectional views illustrating modifications of the gasket shown in FIG. 3.

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

1: cylinder head cover 20: gasket

21: upper part 22: center part

22a, 22b: slope 23: bottom

23a, 23b, 23d: base slope 24, 25: rib

50: gasket groove 52a, 52b: cover slope

An object of the present invention as described above is in the fall prevention structure of the gasket for the cylinder head cover is disposed in the gasket groove of the cross-sectional shape of the 'c' shaped to face the opening side, the gasket is the inside of the gasket groove A central portion having an upper portion of a 'straight' volume so as to be filled in, and having an inclined surface with a predetermined gradient on both sides with respect to the axis of the upper portion, integrally formed at the lower portion of the upper portion, and the gasket groove is A cover inclined surface corresponding to the inclined surface of the gasket is formed at an opened portion, and the gasket is seated in the gasket groove in a state of being in surface contact with the inclined surface through the cover inclined surface. Achieved by the anti-fall structure.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 3 to 7.

3 is a perspective view and an enlarged cross-sectional view for explaining a gasket for a cylinder head cover having a knockdown structure according to an embodiment of the present invention, Figure 4 is a cylinder head having a knockdown structure shown in Figure 3 FIG. 5 is a cross-sectional view illustrating a state in which a gasket for a cover is mounted in a gasket groove having a fall prevention structure, and FIGS. 5 to 7 are cross-sectional views illustrating modifications of the gasket shown in FIG. 3.

Referring to Figure 3, the fall prevention structure of the gasket for cylinder head cover of the present invention is a cross-sectional structure of the gasket 20 between the upper portion 21 and the lower portion 23 of the integral to correspond to the external force in the bending direction Alternatively, the center portion 22 having a trapezoidal cross-sectional shape is integrally formed, and the gasket 20 can be fully seated inside the gasket groove, and the gasket 20 once mounted is a cover (cylinder head cover). It refers to a basic structure generated by being pressed in to reduce the force, stress or repulsive force that excessively pushes up the cover.

The present invention gasket 20 is made of an acrylic rubber material to have a cross-sectional shape as follows.

That is, the upper portion 21 of the shape of the gasket 20 of the present invention has a volume capable of filling the inside of the gasket groove of the cover, but has a 'straight' or 'I' shaped cross-sectional shape.

In addition, the central portion 22 of the gasket 20 is disposed integrally with the upper portion 21, and has a cross-sectional shape of upper and lower beams or trapezoids, and both sides are symmetrical and tapered with a predetermined gradient with respect to its vertical axis. Surface or downward inclined surfaces 22a and 22b are formed.

In addition, the lower portion 23 of the gasket 20 is integrally disposed with the central portion 22 and has a predetermined height extending downward. At this time, the lower portion 23 has a relatively wider width than the width corresponding to the volume of the upper portion 21. At this time, the lower portion 23 preferably has a cross-sectional shape that is substantially the same as the upper portion 21, that is, 'straight' or 'I' shaped cross-sectional shape.

In the present invention, it is preferable that the volume value of the sum of the central portion 22 and the lower portion 23 of the gasket 20 is relatively large compared to the value of the volume of the upper portion 21.

In particular, the downwardly inclined surfaces 22a and 22b of the central portion 22 provide a shape effect of inducing a vertical behavior in the vertical direction or a horizontal behavior in the left and right directions to the axial center of the gasket 20 in response to the inclination gradient thereof. (f).

In addition, since the central portion 22 and the lower portion 23 are relatively large in volume compared to the volume of the upper portion 21, the central portion 22 and the lower portion 23 can counter the horizontal behavior in the left and right directions and prevent the collapse phenomenon in advance. .

Of course, the gasket 20 of the present invention is preferably formed in the upper portion 21 and the lower portion of the ribs 24, 25 having a triangular cross-sectional shape for preventing oil leakage.

Referring to FIG. 4, the gasket groove 50 on which the gasket 20 is to be seated has an inner space corresponding to the width of the upper portion 21 of the gasket 20.

In particular, the opening portions of the gasket groove 50 have a slope corresponding to the gradient of the central portion 22 of the gasket 20, and form cover slopes 52a and 52b in a skirt shape.

Due to the cross-sectional shape features of the gasket 20 and the gasket groove 50 as described above, the gasket 20 is stably provided inside the gasket groove 50 while providing a relatively large contact area at an initial stage of assembly and in an upright state. It is seated.

Thereafter, the gasket 20 not only stably generates the surface pressure in the vertical direction and the left and right directions after being superimposed on the upper surface of the head 3 through a bolt or the like, but also inclined surfaces 22a and 22b of the central portion 22. ) And the cover inclined surfaces 52a and 52b of the gasket groove 50 are in close contact with each other inclined to induce a force in the inclined direction against the horizontal behavior.

5 to 7 show modifications of the gasket for the cylinder head cover of the present invention.

Referring to FIG. 5, the lower portion 23 of the deformed gasket 20a is integrally disposed with the central portion 22 and has a lower width than that corresponding to the volume of the upper portion 21. It is preferable to form the first base inclined surface 23a of the same inclined gradient corresponding to the inclined surface 22a of the center portion 22 in any one of a symmetrical shape or an asymmetrical shape.

Referring to FIG. 6, the lower portion 23 of the differently modified gasket 20b is disposed integrally with the central portion 22 and is hypothetically inclined in the inclination direction of the inclined surface 22a of the central portion 22 of the upper and lower light beams. Since the second base inclined surface 23b in the inclined direction such as mirrored with respect to the horizontal line of the two sides is formed symmetrically, it eventually has a cross-sectional shape of a light beam narrow.

Referring to FIG. 7, the lower portion 23 of the other deformed gasket 20c is integrally disposed with the central portion 22 and disposed below, but has a predetermined height having a side surface 23c perpendicular to the 'straight' end shape. The third base inclined surface 23d is formed to extend downward so that both lower edges are chamfered at either a symmetrical ratio or an asymmetrical ratio, respectively.

The modifications of FIGS. 5 to 7 as a result are seated in the gasket grooves identically or similarly to the gasket for the cylinder head cover of the basic structure described above, but the first, second and third base slopes 23a, 23b, 23d are As the size, direction, and the like of the internal pressure are finely adjusted to correspond to the surface area, they are various modifications necessary to produce a variety of high quality gasket products.

In the present invention configured as described above, the gasket surface pressure is prevented by preventing the gasket from falling down through a coupling relationship between a gasket having an inclined surface having a predetermined gradient in the cross section of the upper and lower light and a gasket groove having an inclined surface having a shape corresponding to the gasket. There is an effect that the fall prevention structure of the gasket for the cylinder head cover which is kept stable and solves the problem of oil leakage is provided.

That is, the fall prevention structure of the gasket for cylinder head cover of the present invention allows the vertical movement in the vertical direction or the horizontal movement in the left and right directions to be transmitted toward the axial center of the gasket through the inclined surface of the center portion formed between the upper and lower portions. It is very effective to keep the center upright on the top of the cylinder head.

In addition, the fall prevention structure of the cylinder head cover gasket according to the present invention is applied to the opening of the gasket groove excessively due to the crimping of the gasket groove through the surface contact between the inclined surface of the g-shaped gasket groove and the inclined surface of the gasket. By preventing it, there is an advantage that the durability of the cylinder head cover or the gasket can be increased by eliminating the problem that cracks are generated in the opening portion of the gasket groove at once.

In addition, the fall prevention structure of the gasket for cylinder head cover of the present invention has a relatively small volume, but has a straight upper part that can be filled to the inside of the gasket groove, thereby preventing falling by providing an airtight contact surface. There is an effect that can prevent the leakage or leakage.

In addition, the fall prevention structure of the gasket for the cylinder head cover of the present invention provides a gasket cross-sectional shape of the basic type and various modifications, thereby providing a variety of high-quality gasket products to consumers.

Claims (7)

In the fall prevention structure of the cylinder head cover gasket arrange | positioned in the gasket groove | channel 50 of the "c" cross section shape which opened the opening side downward, The gasket 20 has an upper portion 21 of a 'straight' volume so as to be filled in the inside of the gasket groove 50, a slope of a predetermined gradient on both sides based on the axis of the upper portion 21 ( The central part 22 which has 22a, 22b is integrally formed in the lower part of the said upper part 21, The gasket groove 50 forms cover inclined surfaces 52a and 52b corresponding to the inclined surfaces 22a and 22b of the gasket 20 at the opened portion thereof. The gasket 20 is prevented from falling down when the gasket 20 is seated in the gasket groove 50 while in surface contact with the inclined surfaces 22a and 22b and the cover inclined surfaces 52a and 52b. rescue. The method of claim 1, Falling structure of the cylinder head cover gasket, characterized in that the lower portion (23) having a wider width than the width corresponding to the volume of the upper portion 21 is formed below the central portion (22). The method of claim 2, The lower part 23 has a fall prevention structure of a gasket for a cylinder head cover, characterized in that it has a 'straight' cross-section extending downward from the lower portion of the central portion by a predetermined height. The method of claim 2, The lower part (23) has a cross section of upper and lower light beams by a first base inclined surface (23a) corresponding to the inclined surface (22a) of the central portion (22). The method of claim 2, The lower part 23 has a cross section of a light receiving narrow by a second base inclined surface 23b in an inclined direction in which the inclined direction of the inclined surface 22a of the central portion 22 is mirrored with respect to an imaginary horizontal line. Falling prevention structure of the gasket for the cylinder head cover. The method of claim 2, The lower part 23 extends downward from the central part 22 to have a vertical side surface 23c in a 'straight' short shape, and both lower edges are chamfered at either a symmetrical ratio or an asymmetrical ratio, respectively. A fall prevention structure of a gasket for a cylinder head cover, characterized in that it has a cross section forming a three-base inclined surface (23d). The method of claim 1, At least one rib (24, 25) is formed on the surfaces of the upper portion (21) and the lower portion (23) of the gasket 20, the fall prevention structure of the gasket for a cylinder head cover.