JP2841754B2 - Seal structure of cam chain cover in engine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal structure for a cam chain cover in an engine, and more particularly to a seal structure for a cam chain cover in an engine that performs an oil seal while attaching the cam chain cover.

[Conventional technology]

In a vehicle engine, there are an engine in which cylinders are arranged in series, an engine in which cylinders are arranged to face each other, and an engine in which each bank cylinder is arranged in a V-shape.

As a V-type engine in which each bank cylinder is arranged in a V-shape, there is one configured as shown in FIGS. 7 to 10, for example.

The engine 102 shown in FIGS. 7 to 10 includes a V-shaped cylinder block 104 having first and second cylinder banks 106-.
The first and second cylinder heads 110-1, 110-1 and 106-2
-2 is placed. Cylinder block 104
An oil pan 112 is provided at the lower part of.

As shown in FIG. 8, the cylinder block 104 is provided with a rotatable crankshaft 114 directed in the front-rear direction of the engine 102. A crank pulley 116 is fixedly provided at an end of a crankshaft 114 protruding from one side of the engine 102.

First and second camshafts 118-1 and 118-2 are rotatably provided on the first and second cylinder heads 110-1 and 110-2. The first and second camshafts 118
The first and second cam pulleys 120-1 and 120-2 are fixedly mounted on one side of the engine 102 in the first and the second 118-2.

One accessory (not shown) is provided in the first cylinder bank 106-1 between the crank pulley 116 and the first cam pulley 120-1. The one accessory (not shown) is provided.
Is driven by the rotation of the first rotary shaft 124-1 on which the first auxiliary pulley 122-1 is fixed.

The cylinder block 104 above the crank pulley 116 and lower than the first and second camshafts 118-1 and 118-2 is provided with another auxiliary device (not shown). The other accessory (not shown) includes a second accessory pulley 12
2-2 is driven by the rotation of the second rotary shaft 124-2, which is fixed.

The crank pulley 116 and the first and second auxiliary pulleys 122-
1, 122-2 and first and second cam pulleys 120-1, 120-2
, A cam chain 128 is wound.

The cam chain 128 includes the first and second cylinder heads 1
10-1 and 110-2, one side wall surface 110c-1 and 110c-2 and first and second cylinder head covers 148-1 mounted on the first and second cylinder heads 110-1 and 110-2. , 1
48-2 and the cam chain cover 130.

Further, as such a cam chain cover device,
For example, it is disclosed in Japanese Utility Model Laid-Open No. Sho 62-69056 and Japanese Utility Model Laid-Open No. Sho 61-183445. Japanese Unexamined Utility Model Publication No. Sho 62-69056 discloses the lower edge of the upper gabber formed by either the lower edge of the upper cover or the upper edge of the lower cover and a vertical flange provided inside or outside the lower edge. And a groove into which the other of the upper edge of the lower cover and the lower cover is fitted. Japanese Utility Model Application Laid-Open No. 61-183445 discloses a device in which a back cover wider than a cylinder head is provided with support means for abutting against a cylinder block at the back of a lower end portion of a lateral edge thereof.

[Problems to be solved by the invention]

By the way, in the conventional cam chain cover sealing structure of the engine, the cam chain cover 130
However, as shown in FIG. 9, the cylinder head 110 is disposed in a cover mounting space S formed by projecting the cylinder head 110 by a distance L to one side with respect to the cylinder block 104.
That is, the upper surface 106a of the cylinder bank 106 is formed flat in the horizontal direction in FIG.
9, a head gasket 108 is interposed between the upper surface 106a of the cylinder bank 106 and the lower surface 110b of the cylinder head 110.
Then, the cam chain cover 130 is placed in the cover mounting space S in parallel with the lower surface 110b of the cylinder head 110, that is,
It is mounted by moving in the direction of the white arrow in FIG.

As a result, as shown in FIG.
Since the upper surface 130a of the cylinder chain 104 and the upper surface 130a of the cylinder block 104 are not processed at the same time, it is difficult to make the upper surface 130a of the cam chain cover 130 coincide with the upper surface 106a of the cylinder bank 106 of the cylinder block 104 on the same plane. The portion D is likely to occur, and the space between the cylinder head 110 and the cam chain cover 130 cannot be completely sealed, and there is a fear that oil leakage may occur, which is disadvantageous in practical use.

In the case where the cam chain cover 130 and the cylinder block 104 are simultaneously processed to avoid the above-described inconvenience, the head is required to assemble the cam chain cover 130 in the direction indicated by a white arrow in FIG. Gasket 10
Rubbing the lower surface 108b portion of 8 may cause oil leakage, which is disadvantageous in practical use.

Further, as shown in FIG. 10, the cam chain accommodating portion M formed in one side wall portion 110c of the cylinder head 110 has a width m as small as possible for the purpose of downsizing the engine 102. It takes a lot of trouble,
There is a disadvantage that the assemblability of the cam chain 128 is reduced, which is disadvantageous in practical use.

[Object of the invention]

Therefore, an object of the present invention is to provide a cam chain cover attached to the cylinder block and the cylinder head to surround the cam chain arranged on one side of the cylinder block and the cylinder head, in order to eliminate the above-described inconvenience,
A notch is provided at an end of the head gasket on the cam chain side, and a cam chain side end of the press-fitting portion, the cylinder block and the cylinder head which engages with the notch, and a cam chain cover facing the end. An elastic member with a seal part for sealing the end is provided, and a plate-shaped core material is provided inside the press-fit part, so that the cam chain cover is attached to the elastic member with the press-fit part engaged with the notch. Accordingly, it is an object of the present invention to realize a cam chain cover seal structure in an engine capable of achieving an oil seal on one side of a cylinder block and a cylinder head and improving the assemblability of a cam chain.

[Means for solving the problem]

In order to achieve this object, the present invention surrounds a cam chain arranged on one side of a cylinder block and a cylinder head in an engine having a cylinder block and a cylinder head mounted on a top surface of the cylinder block via a gasket. In order to provide a cam chain cover to be attached to the cylinder block and the cylinder head, a notch is provided at an end of the head gasket on the cam chain side, and a press-fitting portion engaging with the notch, the cylinder block and the cylinder head are provided. An elastic member provided with a seal portion for sealing an end portion on the cam chain side and an end portion of the cam chain cover facing the end portion,
A plate-shaped core material is provided inside the press-fit portion.

[Action]

With the above configuration, when the cam chain cover is assembled, the cam chain is disposed on one side of the cylinder block and the cylinder head, and the cylinder block and the cylinder head are elastically attached to surround the cam chain. The cam chain cover is attached via.

At this time, the elastic member engages the press-fit portion with the cutout portion of the head gasket, and connects the end of the cylinder block and the cylinder head on the cam chain side and the end of the cam chain cover facing the end. The cam chain cover is mounted to seal the cylinder block and one side of the cylinder head in order to seal with a seal portion.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 to 4 show an embodiment of the present invention. In FIG. 4, 2 is a V-type engine, and 4 is a V-shaped cylinder block. The V-type engine 2 includes first and second cylinder banks 6-1 and 6-2 of the cylinder block 4.
First and second head gaskets 8-1, 8-2 to be described later.
The first and second cylinder heads 10-1, 10-2 are placed via the cylinder block 4, and an oil pan 12 is provided below the cylinder block 4.

The silica block 4 is provided such that a crankshaft 14 directed in the front-rear direction of the V-type engine 2 is rotatable. At one end of the crankshaft 14, a crank pulley 16 is fixedly provided.

The first and second cylinder heads 10-1 and 10-2 include:
First and second camshafts 18-1 and 18-2 are rotatably provided. The first and second camshafts 18-1 and 18-1
-2, the first and second cam pulleys 20-1 and 20-1
-2 is fixedly provided.

One accessory (not shown) is provided in the first cylinder bank 6-1 between the crank pulley 16 and the first cam pulley 20-1. This one auxiliary machine (not shown) is driven by rotation of a first auxiliary machine shaft 24-1 on which the first auxiliary machine pulley 22-1 is fixed.

Further, another accessory (not shown) is provided in one cylinder block 4 above the crank pulley 16 and lower than the first and second camshafts 18-1 and 18-2. The other accessory (not shown) is driven by the rotation of a second accessory shaft 24-2 on which the second accessory pulley 22-2 is fixed.

A second cylinder bank 6-2 between the crank pulley 16 and the second cam pulley 20-2 has a cam chain described later.
A chain support 26 for supporting 28 is provided.

The crank pulley 14 and the first and second cam pulleys 20-
A cam chain 28 is wound around the first and second auxiliary pulleys 22-1 and 22-2.

Furthermore, the cylinder block 4 and the first and second cylinder heads 10-1 and 10-2 are arranged to surround a cam chain 28 disposed on one side of the cylinder block 4 and the first and second cylinder heads 10-1 and 10-2.
A cam chain cover 30 to be attached to the cylinder heads 10-1 and 10-2 is provided, a notch 32 is provided in a part of the head gasket 8, and a press-fitting portion 42, which will A sealing portion 44 for sealing the end of the block 4 and the first and second cylinder heads 10-1 and 10-2 on the cam chain 28 side and the end of the cam chain cover 30 facing the end. An elastic member 36 having the following structure is provided, and a plate-shaped core member 34 is provided inside the press-fit portion 42.

That is, the cam chain cover 30 is provided so as to be expanded so as to surround one side portion of the cylinder block 4 and the first and second cylinder heads 10-1 and 10-2.

Since the first and second head gaskets 8-1 and 8-2 have the same structure, the first head gasket 8-1 will be described.

First cylinder bank 6-1 of the cylinder block 4
And the vicinity of the bolt hole 38 of the first head gasket 8-1 interposed between the first cylinder head 10-1 and the first cylinder bank 10-1, the first cylinder head 10-1, and the cam. An arc-shaped notch 32 is provided at a joint portion with the chain cover 30, for example. This first head gasket 8-1
Is formed of, for example, carbon, and the thickness n is set to about 1.2 mm. The first head gasket 8-1 is interposed between the first cylinder bank 6-1 and the first cylinder head 10-1. At this time, as shown in FIG.
It is arranged slightly inside, for example, a distance t from the sealing surface 30c of the thirty. Then, the first cylinder bank 6-1 upper surface 6a-1
A space 40 is formed by one side of the first cylinder head 10-1 and one side of the lower surface 10b-1 of the first cylinder head 10-1, the notch 32, and the portion of the first head gasket 8-1 side 8c-1 near the notch 32.

Further, the elastic member 36 is engaged with the space 40. In the elastic member 36, a press-fitting portion 42 to be press-fitted into the space 40, a seal portion 44, and a cover fixing convex portion 46 are integrally formed. The seal portion 44 has a substantially trapezoidal cross section, and has a cover fixing convex portion 46 on one side and a press-fit portion 42 on the other side.

The press-fit portion 42 is formed to protrude in an arc shape and has a thickness n (1.2 mm) of the first head gasket 8-1.
For example, it is formed to be 0.1 to 0.2 mm thick. At this time, a core 34 for preventing deformation of the press-fitting portion 42 at the time of press-fitting is provided in the seal portion 44 and the press-fitting portion 42. This core 34
Is formed of an iron plate in a disk shape having a thickness of 0.8 mm, for example.

The cover fixing protrusion 46 fits into the fixing recess 30d of the cam chain cover 30.

Second cylinder bank 6-2 and second cylinder head 10-
The second head gasket 8-2 interposed between the two is also formed in the same manner as the first head gasket 8-1.

Reference numeral 48 denotes a cylinder head cover, and reference numeral 50 denotes a bolt for fixing the cam chain cover 30.

 Next, the operation will be described.

When assembling the cam chain cover 30, the cam chain 28 is arranged on one side of the cylinder block 4 and the cylinder head 10, and is interposed between the cylinder block 4 and the cylinder head 10 to surround the cam chain 28. The press-fitting portion 42 of the elastic member 36 is press-fitted into the notch 32 of the head gasket 8, and the cam chain cover 30 is attached by fitting the fixing concave portion 30 a of the cam chain cover 30 to the fixing convex portion 46.

At this time, the sealing portion of the elastic member 36 seals the joint between the cylinder block 4, the cylinder head 10, and the cam chain cover 30.

As a result, the notch 32 of the head gasket 8 is
The fixed concave portion 30a of the cam chain cover 30 is fitted to the fixed convex portion 46 of the elastic member 36 into which the 42 is press-fitted, and an oil seal can be achieved at the joint portion between the cylinder block 4, the cylinder head 10, and the cam chain cover 30. The sealing performance of the engine 2 can be improved, which is practically advantageous.

In addition, the cam chain cover 30 is extended so as to surround one side of the cylinder block 4 and the cylinder head 10, so that the attachment and detachment of the cam chain 28 can be easily performed, and the assemblability of the engine is improved. Can be done.

Further, the elastic member 36 has only the core material 34 provided inside, and can be formed without complicating the structure, and the manufacturing cost can be kept low.

Note that the present invention is not limited to the above-described embodiment, and various application modifications are possible.

For example, in the embodiment of the present invention, the notch 32 and the press-fit portion 42 of the elastic member 36 are provided in an arc shape, and
Although the notch 34 is formed in a disk shape, the notch 32 and the elastic member 36 improve the sealing performance.
As shown in the figure, the notch 62 provided in the head gasket 8 and the press-fitting portion 64 of the elastic member 36 may be formed in a V-shape, and the core 66 may be formed in a triangular shape.

Further, in the embodiment of the present invention, the cam chain cover of the V-type engine is used, but it is also possible to use the cam chain cover of another type of engine such as an in-line engine.

〔The invention's effect〕

As described in detail above, according to the present invention, a cam chain cover attached to the cylinder block and the cylinder head is provided to surround the cam chain arranged on one side of the cylinder block and the cylinder head, and the cam chain of the head gasket is provided. A notch is provided at the end on the side, and the press-fitting portion engaging with the notch, the end on the cam chain side of the cylinder block and the cylinder head and the end of the cam chain cover facing the end are sealed. An elastic member provided with a seal portion to be provided is provided, and a plate-shaped core material is provided inside the press-fit portion. Thus, the oil seal on one side can be achieved, and the sealing performance can be improved, which is practically advantageous. Also,
By providing the cam chain cover to be attached to the cylinder block and the cylinder head, the assemblability of the cam chain can be improved.

[Brief description of the drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is an enlarged cross-sectional view of a seal structure of a cam chain cover, FIG. 2 is an enlarged vertical sectional view of a seal structure of a cam chain cover, and FIG. FIG. 4 is a schematic front view of the engine, showing an enlarged sectional view of a main part of the head gasket. 5 and 6 show another embodiment of the present invention. FIG. 5 is an enlarged sectional view of a main part of a head gasket, and FIG. 6 is an enlarged sectional view of a main part of an elastic member. 7 to 10 show the prior art of the present invention, FIG. 7 is a schematic front view of an engine, FIG. 8 is a schematic front view of an engine,
FIG. 9 is an enlarged view of a main part of a seal structure of a cam chain cover, and FIG. 10 is a schematic plan view of a cylinder head. In the figure, 2 is a V-type engine, 4 is a cylinder block, 6 is a cylinder bank, 8 is a head gasket, 10 is a cylinder head, 12 is an oil pan, 16 is a crank pulley, 20 is a cam pulley, 28 is a cam chain, 30 is Cam chain cover, 32 is notch, 34 is core material, 36 is elastic member, 38
Is a bolt hole, 40 is a space portion, 42 is a press-fit portion, 44 is a seal portion,
46 is a cover fixing projection, 48 is a cylinder head cover, and 50 is a fixing bolt.

Claims (1)

(57) [Claims] In an engine having a cylinder block and a cylinder head mounted on a top surface of the cylinder block via a head gasket, the cylinder block and a cylinder chain are arranged to surround a cam chain disposed on one side of the cylinder block and the cylinder head. A cam chain cover is attached to the cylinder head, a notch is provided at an end of the head gasket on the cam chain side, and a press-fitting portion engaging with the notch and the cam chain side between the cylinder block and the cylinder head are provided. An engine, comprising: an elastic member having an end portion and a seal portion for sealing the end portion of the cam chain cover facing the end portion, and a plate-shaped core material is provided inside the press-fit portion. The seal structure of the cam chain cover.