JP3598000B2 - Sealing method for internal combustion engine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sealing method between a side surface of a cylinder block and a cylinder head and a timing cover attached to the side surface in an internal combustion engine.
[0002]
[Prior art]
In general, in an internal combustion engine, a cylinder block and a cylinder head are fastened with a head gasket interposed therebetween, and a timing cover for transmitting a rotation of a crankshaft to a camshaft or a timing gear covers the cylinder. Fastening is performed over both the side surface of the block and the side surface of the cylinder head.
[0003]
In this case, it is relatively easy to finish the side surface of the cylinder block and the side surface of the cylinder head on the same plane, but one end surface of the head gasket inserted between the cylinder block and the cylinder head, Since it is extremely difficult to align the side surfaces of the cylinder block and the cylinder head on the same plane, there is a problem in sealing between one end surface of the head gasket and the timing cover.
[0004]
Therefore, Japanese Utility Model Publication No. Hei 5-23791 discloses a technique in which one end face of the head gasket is depressed from the side faces of the cylinder block and the cylinder head, and a gasket made of an elastic body is attached to this one end face. With this gasket, it has been proposed to close the gap between the head gasket and the timing cover to secure the sealing property.
[0005]
[Problems to be solved by the invention]
However, in this prior art, since a gasket for securing a seal between the head gasket and the timing cover is attached to the head gasket, the gasket can be assembled together with the head gasket. Although it is easy to assemble, on the other hand, in order to mount the gasket on the head gasket, the gasket and one end of the head gasket are formed in a special shape as described in the publication. Therefore, there is a problem that not only the cost is greatly increased, but also that the sealing performance of the head gasket itself is reduced due to the gasket to which the head gasket is attached.
[0006]
An object of the present invention is to provide a sealing method that solves these problems.
[0007]
[Means for Solving the Problems]
To achieve this technical problem, the present invention
`` In an internal combustion engine having a timing cover for covering a timing chain or a timing gear, etc., on a side surface of a cylinder block and a cylinder head fastened with a head gasket in between,
One end surface of the head gasket is recessed from the side surfaces of the cylinder block and the cylinder head, and a liquid sealing material is applied to the one end surface in a state where the head gasket is oriented vertically with the one end surface facing upward, Next, the cylinder block and the cylinder head are fastened with the head gasket interposed therebetween, and then the timing cover is fastened to the side surfaces of the cylinder block and the cylinder head . "
I decided to say.
[0008]
[Action and Effect of the Invention]
In this way, before the head gasket is incorporated into the cylinder block and the cylinder head, the liquid sealing material is applied to one end face of the head gasket in advance with the head gasket vertically oriented with the one end face upward. When the head gasket is applied to the cylinder block and the cylinder head, a gap formed between one end surface of the head gasket and the timing case is applied to one end surface of the head gasket. Since it can be completely filled with the sealing material, the sealing property between the head gasket and the timing cover can be ensured.
[0009]
In this case, the liquid sealing material need only be applied to one end surface of the head gasket without being applied to the front and back surfaces of the head gasket. Since it is not necessary to form one end of the gasket into a complicated shape, the cost can be significantly reduced, and further, the sealing effect of the head gasket itself is not impaired.
[0010]
In particular, since the timing cover is not in close contact with the whole of the side surfaces of the cylinder block and the cylinder head, but is only in close contact with both side portions of the timing cover, the liquid as described in claim 2, By applying the sealing material only to a portion of the one end surface of the head gasket where the timing cover is in close contact, the amount of the liquid sealing material used can be reduced.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
[0012]
In this figure, reference numeral 1 denotes a cylinder block, reference numeral 2 denotes a cylinder head, and reference numeral 3 denotes a timing cover formed in a U-shape in cross section so as to cover a timing chain or timing gear (not shown).
[0013]
The cylinder block 1 and the cylinder head 2 are fastened by a plurality of head bolts (not shown) with a head gasket 4 made of a thin metal plate or the like between the upper surface 1a and the lower surface 2a. Is fastened with a plurality of bolts 5 so as to straddle both sides 1b and 2b of the cylinder block 1 and the cylinder head 2 so as to be in close contact with a gasket (not shown) therebetween. I have.
[0014]
Then, one end face 4a of the head gasket 4 is recessed from the side faces 1b, 2b of the cylinder block 1 and the cylinder head 2 by an appropriate dimension S, and the right and left sides of the timing cover 3 in the one end face 4a are in close contact. The liquid sealing material 6 is applied to two portions before the head gasket 4 is assembled between the cylinder block 1 and the cylinder head 2.
[0015]
The corners between the upper surface 1a and the side surface 1b of the cylinder block 1 and the corners between the lower surface 2a and the side surface 2b of the cylinder head 2 are provided with chamfered surfaces 1c and 2c. As shown in FIG. 4, the liquid sealing material 6 is applied to the one end face 4a of the head gasket 4 with the one end face 4a facing upward and the head gasket 4 being vertically oriented. This is performed by moving the nozzle 7 and the head gasket 4 relatively in the direction of the one end face 4a while ejecting the liquid sealing material 6 downward from the nozzle 7.
[0016]
In this configuration, the cylinder block 1 and the cylinder head 2 are fastened with a head gasket interposed therebetween, and then the timing cover 3 is fastened to the side faces 1 b and 2 b of the cylinder block 1 and the cylinder head 2. As shown in FIG. 3, the gap between the timing cover 3 and the head gasket 4 can be completely filled with the liquid sealing material 6 previously applied to one end face 4a of the head gasket 4. The sealing property between the gasket and the timing cover can be ensured.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an embodiment of the present invention.
FIG. 2 is an enlarged sectional view taken along the line II-II of FIG.
FIG. 3 is a sectional view showing an assembled state.
FIG. 4 is a perspective view showing a state in which a liquid sealing material is applied to a head gasket.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylinder block 1b Side surface of cylinder block 2 Cylinder head 2b Side surface of cylinder head 3 Timing cover 4 Head gasket 4a One end surface of head gasket 6 Liquid sealing material

Claims (2)

In an internal combustion engine, a timing cover for covering a timing chain or a timing gear is fastened to a side surface of a cylinder block and a cylinder head which are fastened with a head gasket interposed therebetween.
One end surface of the head gasket is recessed from the side surfaces of the cylinder block and the cylinder head, and a liquid sealing material is applied to the one end surface in a state where the head gasket is oriented vertically with the one end surface facing upward, Next, the cylinder block and the cylinder head are fastened with the head gasket interposed therebetween, and then the timing cover is fastened to the side surfaces of the cylinder block and the cylinder head . 2. The sealing method for an internal combustion engine according to claim 1, wherein the liquid sealing material is applied only to a portion of the one end surface of the head gasket where the timing cover is in close contact.

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