JPH10231935A - Sealing structure of three-member joint part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide perfect sealing work by providing a protruded piece projected farther than first and second member end surfaces at an intermediate part of a groove on a plate type gasket and forming a recessed part into which this protruded piece is inserted on a joint surface of a third member. SOLUTION: Clearances 17, 18 of liquid gasketing agent 15 are produced adjacent to an end surface 14a of a plate type gasket 14 at a part except for a protruded piece 14b, and they are produced adjacent to upper and lower joint surfaces 14c, 14d of the plate type gasket 14 at a part except for the protruded piece 14b. Consequently, a place where the clearances 17, 18 are produced moves from the end surface 14a of the plate type gasket 14 (protruded piece 14b) to the joint surfaces 14c, 14d as they turn around a circumference of the protruded piece 14b of the plate type gasket 14, and a place where no clearances 17, 18 exist is produced in the middle between them. As the place where none of the clearances 17, 18 exist is produced, it is possible to prevent leakage of oil and cooling water on a three-member joint part B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-member joint structure in which three members are abutted to form a T-shaped joint.

[0002]

2. Description of the Related Art FIG. 1 is a side view of an engine showing an example of a three-member joint. In this engine, a cylinder member 2 serving as a second member is joined to a lower portion of a cylinder head 1 serving as a first member, and a third member spans the end faces of the cylinder head 1 and the cylinder block 2. The timing cover 3 is joined. The timing cover 3 is a member that covers a timing chain and a timing gear for driving a cam shaft (not shown).

Accordingly, a three-member joint A having a T-shaped joint surface is formed between the cylinder head 1, the cylinder block 2, and the timing cover 3. A plate-like gasket 4 is sandwiched between the cylinder head 1 and the cylinder block 2. The plate-like gasket 4 seals between the two members 1 and 2 in a liquid-tight manner, so that compressed gas, oil, cooling, etc. Water leakage is prevented.

FIG. 2 is a detailed view of a three-member joint A, which is an enlarged view of a part II in FIG. 1, and FIG. 3 is a longitudinal sectional view of the three-member joint A along a line III-III in FIG. As shown here, the end faces 1 of the cylinder head 1 and the cylinder block 2
Liquid gasket agent 5 is applied between a, 2a and timing cover 3 to prevent oil or cooling water from leaking.

The end 4 a of the plate-like gasket 4 is connected to the end faces 1 of the cylinder head 1 and the cylinder block 2.
The groove 6 is formed to be slightly recessed than the grooves a and 2a. The reason for this is to prevent the end of the plate-shaped gasket 4 from being caught between the cylinder head 1 or the cylinder block 2 and the timing cover 3 to cause a defective seal. The groove 6 is filled with the liquid gasket agent 5.

[0006]

However, as shown in FIG. 2, gaps 7 and 8 are formed at the corners of the groove 6 where the liquid gasket agent 5 cannot enter. Since the gaps 7 and 8 are formed linearly, oil and cooling water easily leak therefrom. Therefore, as shown in FIG. 4, there is a technique in which the corners of the cylinder head 1 and the cylinder block 2 are chamfered 9 and 10 to improve the filling property of the liquid gasket agent 5 into the groove 6 (see Japanese Utility Model Application Publication No. -63872), cylinder head 1 and cylinder block 2
In addition to the large amount of processing, the cost is high and a perfect sealing action cannot be expected.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a three-member joint structure capable of obtaining a perfect sealing action with a simple structure. .

[0008]

To achieve the above object, a three-member joint sealing structure according to the present invention comprises first and second members joined with a plate-like gasket therebetween,
It is formed between the first and second members and a third member joined across the end surfaces of the first and second members. The joint surface shape is T-shaped, and the end surfaces of the first and second members are connected to the third member. A liquid gasket agent is applied between the third member and the third member, and the end of the plate-like gasket is recessed from the end surfaces of the first and second members to form a groove. ,
The first and second gaskets are provided in the middle of the groove in the plate-like gasket.
And a concave portion into which the convex portion is inserted is formed on the joint surface of the third member.

In such a configuration, a gap of the liquid gasket agent is generated adjacent to the end face of the plate-like gasket at a portion other than the convex portion of the plate-like gasket, and at a portion of the convex portion at the joint surface of the plate-like gasket. Occur adjacently. Therefore, the place where the gap of the liquid gasket agent occurs moves from the end face of the plate-like gasket to the joining surface as it goes around the convex piece of the plate-like gasket, and there is a place where there is no gap on the way. Occur. Then, a perfect sealing action is exerted by generating a place where no gap exists.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a three-member joint sealing structure according to the present invention will be described below with reference to FIGS. FIG. 5 (a) shows a portion corresponding to FIG. 3 showing the prior art, and FIG. 5 (b) and FIG.
5A and 5B are vertical sectional views taken along lines Vb-Vb and Vc-Vc in FIG. 5A, respectively. In the figure, reference numeral 11 denotes a cylinder head as a first member, reference numeral 12 denotes a cylinder block as a second member, and reference numeral 13 denotes a timing cover as a third member.

As shown in FIGS. 5 (b) and 5 (c), a cylinder block 12 is joined to the cylinder head 11 via a plate-like gasket 14, and straddles the cylinder head 11 and end faces 11a, 12a of the cylinder block 12. Accordingly, the timing cover 13 is joined, thereby forming a three-member joining portion B having a T-shaped joining surface. Cylinder head
A liquid gasket agent 15 is applied between the end faces 11 a and 12 a of the cylinder block 12 and the joining surface 13 a of the timing cover 13.

The end 14 a of the plate-like gasket 14 is connected to the end faces 11 of the cylinder head 11 and the cylinder block 12.
The grooves 16 are slightly recessed from the grooves 12a and 12a, thereby forming a groove 16 (see FIGS. 5A and 5B). The groove 16 is filled with the liquid gasket agent 15.

The plate-like gasket 14 is provided with a convex piece 14b projecting from the end faces 11a and 12a of the cylinder head 11 and the cylinder block 12 at an intermediate portion of the groove 16. The protruding piece 14b is formed, for example, in a trapezoidal shape that tapers toward the timing cover 13, and has an R shape at four corners.

On the other hand, on the joint surface 13a of the timing cover 13, a concave portion 13b into which the convex piece 14b of the plate-like gasket 14 is inserted.
Are formed. This recess 13b is formed as shown in FIG.
As shown in (c), the projection is formed one size larger than the projection 14b, so that the projection 14b does not directly touch the recess 13b.

According to the sealing structure of the three-member joint B constructed as described above, the gaps 17 and 18 of the liquid gasket agent 15 are shown in FIG. As shown in FIG. 5 (c), it is generated adjacent to the end face 14a of the plate-shaped gasket 14, and adjacent to the upper and lower joining surfaces 14c and 14d of the plate-shaped gasket 14 at the protruding piece 14b.

Therefore, as shown in FIG. 6, the place where the gaps 17 and 18 are generated as the sheet goes around the convex piece 14b of the plate-like gasket 14 is located at the end face 14 of the plate-like gasket 14 (the convex piece 14b).
7A to the joining surfaces 14c and 14d, and a place where no gaps 17 and 18 exist as shown in FIG. FIG. 7 is a vertical section taken along the line VII-VII in FIG. The occurrence of a place where the gaps 17 and 18 do not exist prevents leakage of oil and cooling water at the three-member joint portion B.

According to the seal structure of the three-member joint portion B, the plate-like gasket 14 is formed with the convex piece 14b,
A perfect sealing action can be obtained by an extremely simple structure in which a concave portion 13b into which the convex piece 14b is inserted is formed on the joint surface 13a of the timing cover 13.

When assembling the timing cover 13 to the end faces 11a and 12a of the cylinder head 11 and the cylinder block 12, no special precautions need to be taken, and a liquid gasket agent 15 is applied to the joining surface 13a of the timing cover 13. Since it is only necessary to join them together, the assembly of the engine becomes easy.

In this embodiment, the cylinder head 11, the cylinder block 12, and the timing cover 13 constituting the engine are described as an example of the members constituting the three-member joint. However, the present invention is not limited to the engine, and other machines and structures may be used. The seal structure of the three-member joint according to the present invention can be widely applied to objects and the like.

[0020]

As described above, the seal structure of the three-member joint according to the present invention comprises the first and second members joined with the plate-like gasket interposed therebetween, and the first and second members.
And a third member joined across the end surface of the third member, the joint surface shape of which is T-shaped, and between the end surfaces of the first and second members and the third member. A liquid gasket agent is applied to the plate-like gasket, and the end of the plate-like gasket is recessed from the end surfaces of the first and second members to form a groove. A convex piece protruding from the end faces of the first and second members is provided at an intermediate portion of the groove, and a concave portion into which the convex piece is inserted is formed on a joint surface of the third member. ,
As described above, a perfect sealing action can be obtained by a very simple structure in which the convex piece is formed on the plate-like gasket and the concave portion into which the convex piece is inserted is formed on the joint surface of the third member.

[Brief description of the drawings]

FIG. 1 is a side view of an engine showing an example of a three-member joint.

FIG. 2 is a detailed view of a three-member joint showing the prior art by enlarging part II of FIG. 1;

FIG. 3 is a cross-sectional view of the three-member joining portion taken along the line III-III in FIG. 2, showing a conventional technique as in FIG.

FIG. 4 is a longitudinal sectional view of a three-member joint showing another conventional technique.

FIG. 5 is a view showing an embodiment of the present invention, in which (a) is a cross-sectional view of the three-member joint, and (b) is a longitudinal cross-section of the three-member joint along the line Vb-Vb of (a). FIG. 3C is a vertical cross-sectional view of the three-member joint along the line Vc-Vc in FIG.

FIG. 6 is a longitudinal sectional view showing movement of a gap of a liquid gasket agent near a protruding piece of a plate-like gasket.

FIG. 7 is a vertical cross-sectional view of the three-member joining portion along the line VII-VII in FIG. 5 (a).

[Explanation of symbols]

 11 Cylinder head as a first member 11a End face of a cylinder head 12 Cylinder block as a second member 12a End face of a cylinder block 13 Timing cover as a third member 13a Joining surface of a timing cover 13b Recess 14 Plate gasket 14a End of plate-like gasket 14b Convex piece 15 Liquid gasket 16 Groove 17, 18 Gap between liquid gasket

Claims (1)

[Claims] A first and a second member joined together with a plate-like gasket interposed therebetween, and joined across end surfaces of the first and second members. Third
Between the end surfaces 11a, 12a of the first and second members 11, 12 and the third member 13, and a liquid gasket agent 15 formed between the third member 13 and the third member 13. Is applied, the end portion 14a of the plate-like gasket 14 is recessed from the end surfaces 11a, 12a of the first and second members 11, 12, and the groove 16 is formed in the three-member joint sealing structure B. The plate-like gasket 14 is provided with a projecting piece 14b projecting from the end faces 11a, 12a of the first and second members 11, 12 at the intermediate portion of the groove 16, and a recess 13b into which the projecting piece 14b is inserted is formed as a third part. Parts
13. A three-member joint sealing structure formed on 13 joining surfaces 13a.