JPH0463954A - Sealing structure for cam chain cover in engine - Google Patents

Abstract

PURPOSE:To improve a sealing property by providing a notched part on the part of a head gasket, and also an elastic member engaging with the notched part and having a core material to make oil sealing with a cam chain cover fitted. CONSTITUTION:When a cam chain cover 30 is assembled, a cam chain 28 is arranged on a cylinder block 4 and one side of cylinder heads 10-l and 10-2, and the cam chain cover 30 is fitted to a cylinder block 4 and the cylinder heads 10-1 and 10-2 via an elastic member 36 to surround the cam chain 28. In this case, the elastic member 36 engages with the notched part 32 of a head gasket 8, and also makes oil sealing of a cylinder block 4 and one side of the cylinder heads 10-l and 10-2 with the cam chain cover 30 fitted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sealing structure for a cam chain cover in an engine, and more particularly to a sealing structure for a cam chain cover in an engine that functions as an oil seal while the cam chain cover is attached.

[Conventional technology]

BACKGROUND ART Vehicle engines include those with cylinders arranged in series, those with cylinders facing each other, and those with bank cylinders arranged in a V-shape.

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

The engine 102 shown in FIGS. 7 to 10 has first and second cylinder banks 1 of a V-shaped cylinder block 104.
06-1.106-2 first and second cylinder head 11
0-1.110-2 is mounted. An oil pan 112 is provided at the bottom of the cylinder block 104.

As shown in FIG. 8, the cylinder block 104 has a crankshaft 1 oriented in the longitudinal direction of the engine 102.
14 is rotatably provided.

Crankshaft 1 protruding from one side of the engine 102
A crank pulley 116 is fixedly installed at the end of the crankshaft 14 .

Said first and second cylinder rods 110-1.110-2
The first and second camshafts 118-1, 118-2
is rotatably provided. The first and second camshafts 118-1 and 118-2 have first and second cam pulleys 120-1 and 120-2 mounted on one side of the engine 102.
is permanently installed.

The crank pulley 116 and the first cam pulley 120-1
A negative auxiliary machine (not shown) is provided in the first cylinder bank 106-1 between the two parts, and the first auxiliary machine pulley 122-1 is fixed to the negative auxiliary machine (not shown). It is driven by the rotation of the first rotary shirt 124-1 provided therein.

Further, other auxiliary equipment (not shown) is provided in the cylinder block 104 at a position above the crank pulley 116 and lower than the first and second camshafts 118-1 and 118-2. The auxiliary machine (not shown) is a second rotating shaft 124 to which a second auxiliary machine pulley 122-2 is fixedly attached.
-2 rotations.

The crank pulley 116 and the eleventh second auxiliary pulley 12
2-1.122-2 and first and second cam pulleys 120-1
．． A cam chain 12 days is wound around 120-2.

This cam chain 128 is connected to one side wall surface 110C-1, 110C-1 of the first and second cylinder heads 110-1 and 110-2.
0 cm2 and this first and second cylinder Rad 110-1.
It is surrounded by first and second cylinder head covers 148-1.14B-2 attached to the upper part of cylinder head 110-2 and cam chain cover 130.

Furthermore, such cam chain cover devices are disclosed in, for example, Japanese Utility Model Application No. 62-69056 and Japanese Utility Model Application No. 61-18.
It is disclosed in Japanese Patent No. 3445.

In the device described in Japanese Utility Model Application Publication No. 62-69056, the lower end edge of the upper cover is formed by either the lower end edge of the upper cover or the upper end edge of the lower cover and a vertical flange provided inside or outside of the lower end edge of the upper cover. A groove is formed into which the other part of the lower cover or the upper edge of the lower cover is fitted. Moreover, the one described in Japanese Utility Model Application Publication No. 183445/1983 is provided with a support means for supporting a back cover wider than the cylinder head by abutting against the cylinder block at the back of the upper end of the side edge thereof. .

[Problem that the invention seeks to solve]

By the way, in the seal structure of the cam chain cover in a conventional engine, the cam chain cover 130 is formed by the cylinder head 110 protruding to one side by a distance JIL with respect to the cylinder block 104, as shown in FIG. In other words, the top surface 106a of the cylinder bank 106 is
In addition, the lower surface 110b of the cylinder rod 110 is formed horizontally flat in FIG. 9, and the upper surface 1 of this cylinder bank 106 is
A head gasket 108 is interposed between the lower surface 110b of the cylinder head 110 and the cam chain cover 130, and the cam chain cover 130 is installed in the cover mounting space S parallel to the lower surface 110b of the cylinder head 110, that is, as shown in the white outline in FIG. It is installed by moving it in the direction of the arrow.

As a result, as shown in FIG. 9, the cam chain cover 13
Since the top surface 130a of the cam chain cover 130 and the top surface 106a of the cylinder bank 106 of the cylinder block 104 are not machined simultaneously, it is difficult to align the top surface 130a of the cam chain cover 130 and the top surface 106a of the cylinder bank 106 of the cylinder block 104 on the same plane. This is disadvantageous in that it is not possible to completely seal the gap between the cylinder head 110 and the cam chain cover 130, and there is a risk of oil leakage, which is disadvantageous in practical terms.

In addition, if the cam chain cover 130 and the cylinder block 104 are machined at the same time in order to avoid the above-mentioned inconvenience, the cam chain cover 130 may be assembled into the ninth part.
In order to assemble in the direction of the white arrow in the figure, the lower surface 108b of the degasket 108 must be rubbed, which may cause oil leakage, which is disadvantageous in practical terms.

Furthermore, as shown in FIG. 10, since the cam chain accommodating part M formed in one side wall 110c of the cylinder head 110 has a width m as narrow as possible in order to make the engine 102 more compact, it is easy to attach and detach the cam chain 128. This is disadvantageous in that it takes a lot of effort and reduces the ease of assembling the cam chain 128, which is disadvantageous in practical terms.

[Purpose of the invention]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned inconvenience, an object of the present invention is to provide a cam chain cover that is attached to a cylinder block and a cylinder head so as to surround a cam chain disposed on one side of the cylinder block and cylinder head. A notch is provided in a part of the cam chain cover, and an elastic member with a core material is provided to engage the notch and attach the cam chain cover to provide an oil seal. The present invention provides a sealing structure for a cam chain cover in an engine that can be attached to act as an oil seal on one side of a cylinder block and a cylinder head, and that can improve the ease of assembling a cam chain.

[Means for solving problems]

To achieve this object, the present invention provides an engine in which a cylinder block and a cylinder head are attached to the upper surface of the cylinder block via a head gasket.
providing a cam chain cover attached to the cylinder block and cylinder head to surround a cam chain disposed on one side of the cylinder block and cylinder head;
The present invention is characterized in that a notch is provided in a part of the head gasket, and an elastic member having a core material is provided to engage with the notch and attach a cam chain cover to provide an oil seal.

[Effect]

As described above, when assembling the cam chain cover, the cam chain is placed on one side of the cylinder block and the cylinder head, and the cylinder block and cylinder head are elastically attached to surround the cam chain. The cam chain cover is attached via a member.

At this time, the elastic member engages with the notch of the head gasket, and also attaches the cam chain cover to provide an oil seal between the cylinder block and one side of the cylinder head.

〔Example〕

Embodiments of the present invention will be described in detail below based on the drawings.

1 to 4 show embodiments of this invention. Fourth
In the figure, 2 is a ■-shaped engine, and 4 is a 7-shaped cylinder block. The ■-type engine 2 has first and second cylinder banks 6-1 and 6-2 of the cylinder block 4 via first and second gaskets 81.8-2, which will be described later. Cylinder heads 10-1 and 10-2 are placed thereon, and an oil pan 12 is provided at the bottom of the cylinder block 4.

The silica block 4 is rotatably provided with a crankshaft 14 oriented in the front-rear direction of the ■-type engine 2. At one end of this crankshaft 14,
A crank pulley 16 is fixedly installed.

First and second camshafts 18-L and 18-2 are rotatably provided in the first and second cylinder heads 1O-1 and 0-2. The first and second camshafts 18
-1. At one side end of 18-2, the first and second camboo +
720-1 and 20-2 are fixedly installed.

A negative auxiliary machine (not shown) is provided in the first cylinder bank 6-1 between the crank pulley 16 and the first camboo +720-1. This auxiliary machine (not shown) is a first auxiliary machine shaft 2 to which a first auxiliary machine pulley 22-1 is fixedly installed.
It is driven by the rotation of 4-1.

Further, other auxiliary equipment (not shown) is provided in the cylinder block 4 above the crank pulley 16 and lower than the first and second camshafts 18-1 and 18-2. Other auxiliary equipment (not shown) includes a second auxiliary equipment pulley 22-
It is driven by the rotation of a second auxiliary machine 24-2 to which a second auxiliary machine 24-2 is fixedly attached.

Furthermore, the crank pulley 16 and the second camboo +720-2
A chain support body 26 that supports a cam chain 28, which will be described later, is provided in the second cylinder bank 6-2 in between.

The crank pulley 14 and the first and second cam pulleys 20-
1.20-2 and first and second auxiliary pulleys 22-1.22-
A cam chain 28 is wound around 2 and 2.

Furthermore, the cylinder block 4 and the first and second cylinder rods 10-1. A cam chain cover 30 is provided to be attached to the head gasket 8, a notch 32 is provided in a part of the head gasket 8, and the cam chain cover 30 is engaged with the notch 32 to achieve an oil seal. An elastic member 36 having a core material 34 is provided.

That is, the cam chain cover 30 is expanded to surround one side of the cylinder block 4 and the first and second cylinder hefts 1.1.10-2.

Since the first and second herad gas kents 8-1 and 8-2 have the same structure, the first herad gas kent 8-1 will be explained.

In detail, the vicinity of the bolt hole 38 of the first head gasket 8-1 interposed between the first cylinder bank 6-1 and the first cylinder head 10-1 of the cylinder block 4,
First cylinder bank 6-1 and first cylinder head 10-
For example, an arc-shaped notch 32 is provided at the joint portion between the cam chain cover 1 and the cam chain cover 30. This first head gasket 8-1 is made of carbon, for example, and has a thickness n of 1.2.
Make it around the crane. This first head gasket 8-1
It is interposed between the cylinder bank 6-1 and the first cylinder head 10-1. At this time, as shown in FIG. 1, the cam chain cover 30 is disposed slightly inside the sealing surface 30a of the cam chain cover 30, for example, by a distance t.

One side of the upper surface 6a-L of the first cylinder bank 6-1, one side of the lower surface 10bl of the first cylinder head 10-1, the notch 32, and the first head gasket near the notch 32)
A space 40 is formed by the side surface 8-1 and the side surface 8C-1.

Furthermore, the elastic member 36 is engaged with this space 40. The elastic member 36 includes a press-fitting part 42 that is press-fitted into the space 40, a sealing part 44, and a cover fixing convex part 46 that are integrally formed. The seal portion 44 is formed to have a substantially trapezoidal cross section, and is provided with a cover fixing convex portion 46 and a press-fit portion 42 on the other side.

The press-fitting part 42 is formed to protrude in an arc shape, and has a thickness equal to the thickness n (1, 2
For example, the thickness is 0.1 to 0.2 thicker than that of the base (Tsuru). At this time, the seal portion 44 and the press-fitting portion 42 are provided with a core material 34 that prevents deformation of the press-fitting portion 42 during press-fitting. This core material 34 is formed of an iron plate in the shape of a disk having a thickness of 0.8 mm, for example.

The cover fixing convex portion 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.

The reference numeral 48 is a cylinder cover, and 50 is a bolt for fixing the cam chain cover 30.

Next, the effect will be explained.

When assembling the cam chain cover 30, the cam chain 28 is disposed on one side of the cylinder block 4 and the cylinder head 10, and the cam chain 28 is interposed between the cylinder block 4 and the cylinder head 10 to surround the cam chain 28. The elastic member 36 is press-fitted into the notch 32 of the head gasket 8.
The cam chain cover 30 is attached by press-fitting the cam chain cover 2 and fitting the fixing recess 30a of the cam chain cover 30 into the fixing protrusion 46.

At this time, the seal portion of the elastic member 36 is connected to the cylinder block 4, the cylinder head 10, and the cam chain cover 3.
The joint site with 0 is sealed.

As a result, the fixing recess 30a of the cam chain cover 30 is fitted into the fixing convex part 46 of the elastic member 36 with the press-fitting part 42 press-fitted into the notch 32 of the head gasket 8, and the cylinder block 4, the cylinder head 10, and the cam are connected to each other. The joining part with the chain cover 30 can achieve an oil seal, and the sealing performance of the engine 2 can be improved, which is advantageous in practice.

In addition, by expanding the cam chain cover 30 to surround one side of the cylinder block 4 and the cylinder 7 and 10, the cam chain 28 can be easily attached and detached, making it easier to assemble the engine. can be improved.

Furthermore, since the elastic member 36 only has the core material 34 inside, it can be formed without complicating the structure, and manufacturing costs can be kept low.

Note that the present invention is not limited to the above-described embodiments, and various modifications can be made.

For example, in the embodiment of the present invention, the notch 32 and the press-fitting portion 42 of the elastic member 36 are provided in an arc shape, and
Although the core material 34 is formed into a disk shape, the cutout portion 32 and the elastic member 36 improve the sealing performance. For example, as shown in FIG. It is also possible to form the portion 62 and the press-fitted portion 64 of the elastic member 36 into a V-shape, and to form the core member 66 into a triangular shape.

Further, in the embodiment of the present invention, the present invention is used as a cam chain cover for a type 1 engine, but it can also be used as a cam chain cover for other types of engines such as an in-line type engine.

〔Effect of the invention〕

As described in detail above, according to the present invention, a cam chain cover is provided that is attached to the cylinder block and the cylinder head to surround the cam chain disposed on one side of the cylinder block and the cylinder head, and the cam chain cover is attached to the cylinder block and the cylinder head. In addition to providing a notch in the part, an elastic member with a core material was provided to engage the notch and attach the cam chain cover to provide an oil seal, so the cam chain cover could be attached to the elastic member that engaged in the notch. It can serve as an oil seal between the cylinder block and one side of the cylinder head, improving sealing performance, and is advantageous in practice. Also,
By providing a cam chain cover that is attached to the cylinder block and cylinder head, the ease of assembling the cam chain can be improved.

[Brief explanation of drawings]

1 to 4 show embodiments of the present invention, FIG. 1 is an enlarged cross-sectional view of the seal structure of the cam chain cover, FIG. 2 is an enlarged longitudinal cross-sectional view of the seal structure of the cam chain cover, and FIG. FIG. 4 is an enlarged sectional view of the main part of the head gasket, and FIG. 4 is a schematic front view of the engine. 5.6 shows another embodiment of the present invention, FIG. 5 is an enlarged sectional view of the main part of the head gasket, and FIG. 6 is an enlarged sectional view of the main part of the elastic member. 7 to 10 show the conventional technology of the present invention, FIG. 7 is a schematic front view of the engine, FIG. 8 is a schematic front view of the engine, and FIG. 9 is an enlarged view of the main parts of the seal structure of the cam chain cover. , FIG. 10 is a schematic plan view of the 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 gas scaffold, 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 The cam chain cover 32 is a notch, 34 is a core material, 36 is an elastic member, 38 is a bolt hole, 40 is a space, 42 is a press-fitting part, 44 is a sealing part, 46 is a cover fixing convex part, 48 is to a cylinder 7 is a cover, and 50 is a fixing bolt. Patent Applicant: Suzuki Motor Co., Ltd.
Yoshi Saigo, Patent Attorney, Mirj A-side Pure Buds Figure 2, Figure 3, Figure 9, Procedural Litigation Manual (Method) August 18, 1990

Claims (1)

[Claims] 1. In an engine in which a cylinder block and a cylinder head are attached to the upper surface of the cylinder block via a head gasket, the cylinder block and cylinder head are installed to surround a cam chain arranged on one side of the cylinder prolug and the cylinder head. A cam chain cover is provided to be attached to the head gasket, and a notch is provided in a part of the head gasket, and an elastic member having a core material is provided to engage with the notch and attach the cam chain cover to provide an oil seal. Features: Sealing structure of cam chain cover in engines.