JP2693732B2 - Soundproof cover mounting mechanism for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof cover mounting mechanism for an internal combustion engine (hereinafter, simply referred to as a mounting mechanism).
About. More specifically, engine bodies for motorcycles, automobiles, general-purpose engines, etc. (cylinder heads,
A soundproof cover that is attached to the outer surface of the cylinder head cover, cylinder block, etc. (so to say, the outer surface that intersects the axial direction of the crankshaft), and that absorbs and reduces the sound that accompanies the vibration generated during engine operation is attached to the main body side.
It relates to a mounting mechanism for.

[0002]

2. Description of the Related Art Conventionally, in a cylinder head and a cylinder head cover of a liquid-cooled internal combustion engine, and also in a cylinder block, cooling fins, other protrusions, and pipe connections are not particularly required on their outer surfaces. In general, these are not formed. Therefore, in order to reduce the weight of the engine body and simplify the mold, the engine body is thinner than other parts and is relatively flat.

As an example of one component of such an engine, a cylinder head 51 of a four-valve engine (four intake / exhaust valves are mounted per cylinder) for a motorcycle is shown in FIGS. 9 and 10. It is shown. 9 is a plan view and FIG. 10 is a sectional view taken along the line GG of FIG. The side wall indicated by 52 is the thin and flat portion described above. Although not shown, the side surface of the cylinder head cover and the side surface of the cylinder block are also thin and flat.

The hatching in the figure indicates that
In order to discharge water that may collect at the bottom of the spark plug mounting hole (hereinafter referred to as a plug hole) 53 to the outside of the cylinder head 51, it is drilled to the left (exhaust port 54 side) with a downward inclination. It is a drainage hole 55. Such water is accumulated by the ingress of night dew, rainwater, water for car washing, or the like. That is, this can occur because the cylinder head cover is not particularly rigorously sealed in order to alleviate the expansion of the gas inside the engine due to heating.

On the other hand, it is preferable to form a cooling water passage in the cylinder head 51 for the purpose of improving the cooling effect and also improving the durability of the intake and exhaust valves, which has been conventionally adopted. This cooling water passage is formed, for example, at a portion similar to that of FIG. 8 showing one embodiment of the present invention, that is, at the exhaust port 27 side with an inclination. However, conventionally, the left side of all the plug holes communicates with the space 29 formed around the respective plug holes (the drain hole 55).
Is almost the same position). By doing so, if cooling water is supplied from the cooling water passage 28, the cooling water is discharged to the water jacket (not shown) through the space 29.
Circulated.

Conventionally, since the cooling water passages 27 are arranged on the sides of all the plug holes, all the cooling water passages interfere with the drain holes 55. Therefore, in the engine of the type shown in FIGS. 9 and 10, either the cooling water passage or the drain hole can be formed. Therefore, it is conceivable to form one drain hole along the row of cylinders, that is, so as to communicate with the bottoms of all plug holes, but in the case of a multi-cylinder engine (for example, four or more in-line cylinders) The holes are too long and difficult to process. Therefore, in such a case, conventionally, the cooling water passage is not normally formed.

As prior art, Japanese Utility Model Publication No. 2-3443.
Although there is a governor cover disclosed in Japanese Patent No. 8, the manufacturing process is complicated.

[0008]

The thin-walled and flat-shaped engine body wall described above is more likely to vibrate slightly as the engine operates, as compared with other wall portions having irregularities, and as a result, the internal wall of the engine body tends to vibrate during engine operation. The generated sound is easily transmitted.

The present invention has been made to solve the above problems, and an object thereof is to provide a thin and lightweight soundproof cover which can be easily mounted on the outer surface of an engine body. Another object is to provide a soundproof cover mounting mechanism for an engine body that can be easily mounted.

[0010]

Preparative soundproof cover of the present invention, in order to solve the problems]
The attachment mechanism is the camshaft of the engine body of the internal combustion engine.
Caused a substantially matching shape to the shape of the plate-like elastic member and the <br/> elastic member for vibration absorption to the shape of the outer side surface of the side shift operating chain is accommodated exhibits a shape that substantially matches 且 one elastic Of member
A soundproofing cover ing from the coated cover formed so as to cover the outer surface, projecting from the said outer surface, Oyo said elastic member
And multiple bosses for attaching the cover
The elastic member and the cover cover.
It is characterized in that a mounting hole is formed at a position corresponding to the space .

[0011]

It is preferable that the elastic member is made of a rubber material because it is lightweight, convenient for handling, and capable of effectively absorbing sound.

The outer surface of the engine body is a combination of at least the outer surface of the cylinder head and the outer surface of the cylinder block. If necessary, a soundproof cover is extended to the side surfaces of the cylinder head cover and the crankcase. May be.

A female screw is formed on the boss.
It should be good.

It should be noted that for mounting as referred to in the claims
The holes include not only pure holes for bolts and the like penetrating the elastic member and the cover, but also notches for bolts and the like formed on the edge of the elastic member and the cover. Used for meaning.

[0016]

According to the soundproof cover attachment mechanism of the present invention,
Of the outer surfaces of the engine body, the side surface is generally formed relatively flat, so that it is easy to mount on the side surface. Moreover, since the side surface is generally thin, the sound generated inside the engine is easily transmitted. Therefore, it is possible to provide a good soundproof effect by mounting the soundproof cover on the side surface.

Further, according to the soundproof cover attaching mechanism of the present invention, since it can be formed integrally with the engine body by forming it in the mold, it is easy to form. Moreover, the soundproof cover can be easily mounted only by taking a measure such as forming a hole through which the boss penetrates on the soundproof cover side.

[0018]

[Embodiment] Next, an embodiment of the soundproof cover attaching mechanism of the present invention will be described with reference to the drawings. 1 is a longitudinal sectional view soundproof cover mounting mechanism showing an example of an engine body to be applied to the present invention, FIG. 2 (a) preparative soundproof cover of the present invention
It is a top view which shows an example of the elastic member which comprises an attachment mechanism , FIG.2 (b) is the side view, FIG.3 (a) is a plane which shows an example of the cover which comprises the soundproof cover attachment mechanism of this invention. 3 (b) is a sectional view taken along line AA of FIG. 3 (a), FIG. 4 is a perspective view showing an example of a cylinder head to which the soundproof cover mounting mechanism of the present invention is applied, and FIG. 4 is a plan view of the cylinder head of FIG. 4, FIG. 6 is a sectional view taken along line BB of FIG. 5, FIG. 7 is a sectional view taken along line CC of FIG. 5, and FIG. 8 is taken along line DD of FIG.
It is each sectional drawing of a line, EE line, and FF line.

FIG. 1 is a longitudinal sectional view showing an example of an engine body to which the soundproof cover of the present invention is applied, and FIG. 2A is a plan view showing an example of an elastic member constituting the soundproof cover of the present invention. 2 (b) is a side view thereof, FIG. 3 (a) is a plan view showing an example of a covering cover constituting the soundproof cover of the present invention, and FIG. 3 (b) is AA of FIG. 3 (a). Line cross section, Figure 4
Is a perspective view showing an example of a cylinder head to which the soundproof cover of the present invention is applied, FIG. 5 is a plan view of the cylinder head of FIG. 4, FIG. 6 is a sectional view taken along line BB of FIG. 5, and FIG. C-C
FIG. 8 is a sectional view taken along line D-D, line E-E, and line F-F in FIG.

FIG. 1 illustrates a partial cross section of a four-valve engine for a motorcycle. Reference numeral 1 denotes the engine body, which is composed of a cylinder head cover 2, a cylinder head 3, a cylinder block 4, and a crankcase 5. 6 is a cam shaft, 7 is a piston, 8 is a cylinder, and 9 is a spark plug. The camshaft 6
And the other parts 7, 8, 9 are represented by different cross sections.

A soundproof cover 10 is composed of an elastic member 11 made of a rubber material and a cover cover 12 mounted so as to cover the outer surface of the elastic member 11. The soundproof cover 10 is fixed to the cylinder head cover 2 and the cylinder head 3 of the engine body 1 by the mounting bolts 13, and the outer surfaces of the cylinder head cover 2, the cylinder head 3 and the cylinder block 4 of the engine body 1 are integrated. Covered. Of course, you may form so that the crankcase 5 may be covered.

As shown in detail in FIG. 2, the elastic member 11 is a plate-shaped member and is made of a rubber material such as fluororubber having excellent heat resistance or a synthetic resin such as ethylene propylene rubber. In particular, one side of the elastic member 11 is provided with a so-called skin layer 11a made of solid rubber in order to enhance the vibration damping effect (FIG. 2 (b)). FIG.
The plane shape of the elastic member 11 shown in FIG.
It is almost the same as the side shape of. However, since the portion indicated by 14 is the portion where the vehicle body frame is located, it has a diagonally cut shape. 15a is a hole for a mounting bolt, and 15b is a notch for a mounting bolt. Reference numerals 16a and 16b denote cutout portions corresponding to the convex portions on the outer surface of the engine body.

The covering cover 12 is shown in FIG.
The covering cover 12 is formed in a dish shape so as to cover the elastic member 11 from the outside thereof, and is formed of an aluminum alloy plate, a chrome-plated steel plate, or the like. Reference numeral 17 is a hole for a mounting bolt, which is a hole 15a and a notch 15 in the elastic member 11.
It is formed at a portion corresponding to b.

The elastic member 11 and the covering cover 12
It is not necessary to strictly match the plane shape of the engine with the side surface shape of the engine body. However, it is necessary to keep it in close contact with the side surface of the engine body.

4 to 7 show a cylinder head 3 which constitutes a part of the engine body 1. The surface indicated by P in the figure is the side surface on which the soundproof cover 10 is mounted in FIG. On this side surface P, a boss 19 having a female screw 18 engraved is projected. When mounting the soundproof cover 10, the boss 19 is provided in the hole 15a of the elastic member 11 and the notch 1.
5b, and then made by bolts through holes 17 in the cover 12. Only one camshaft 6 is illustrated in FIG. Reference numeral 20 is a spark plug mounting hole (hereinafter referred to as plug hole), 21 is an intake valve mounting hole, and 22 is an exhaust valve mounting hole. Reference numeral 23 is a tunnel for the camshaft operating chain.

Although the cylinder head 3 is illustrated as a component of the engine body 1 having the boss 19 protruding, the boss 19 may of course be provided on the cylinder block or the cylinder head cover if necessary.

Hatched portions in FIGS. 5 to 7 are drain holes 24 for discharging water that may be accumulated at the bottom of the plug hole 20. Reference numeral 25 is a hole which is inevitably formed for processing the drainage hole 24. In FIGS. 5 and 6, the upper end (on the paper surface) of the water drain hole 24 is inevitably formed together with the processing hole 25. Therefore,
The upper end opening of the drainage hole 24 and the processing hole 25 are both closed by a closing plug 26. As is clear from FIGS. 5 and 6, the drain hole 24 is the first plug hole 2
0a and the second plug hole 20b are communicated with each other, and as shown by 24a, from the second plug hole 20b to the left side in the drawing (the exhaust port 27
Side) (Fig. 5, Fig. 7).

On the other hand, the drain hole 24 which connects the third plug hole 20c and the fourth plug hole 20d is opened downward from the fourth plug hole 20d in the figure as shown by 24b (FIGS. 5 and 6). ).

Normally, this engine is mounted on a motorcycle with its exhaust port 27 side facing the front of the vehicle body, and is inclined from the vertical direction to the front of the vehicle body. When the motorcycle is erected by a so-called side stand, the vehicle body leans to the left when looking forward. For the cylinder head 3 shown in FIG. 5, the exhaust port 27 side on the left side in the figure is the front side of the vehicle body,
The lower part of the figure is the left side of the vehicle. Therefore, since the left side and the lower side in FIG. 5 are inclined downward (toward the ground) for the vehicle body, the water accumulated in all the plug holes 20 is discharged from the open portions 24a and 24b of the drain holes.

On the other hand, FIG. 8 shows that the cooling water passage 2 formed in the cylinder head 3 of FIGS.
8 (however, not shown in FIGS. 4 and 5).
The cooling water passage 28 has a first plug hole 20a in FIG.
From the left of each of the third plug hole 20c and the fourth plug hole 20d, it communicates with a space 29 formed around the respective plug holes. Therefore, the cooling water can be sent from the cooling water passage 28 to the water jacket (not shown) through the space 29. Then, the cooling water is discharged and circulated to the drain passage (not shown). By doing so, the cooling effect is improved and the durability of the intake / exhaust valve is also improved.

By forming the left opening of the water draining hole 24 only in the portion of the second plug hole 24b as described above,
The three cooling water passages 28 can be formed on the left side of the cylinder head 3 without interfering with the drain holes 24.
Therefore, along with the cooling water circulation, it is possible to drain water with almost the same efficiency as the conventional one.

The opening 24a of the drain hole 24 to the left
Is not particularly limited to the portion of the second plug hole 24b, and may be any portion of the first plug hole 20a, the third plug hole 20c, and the fourth plug hole 20d. Then, the cooling water passage 2 is provided in each of the remaining three holes.
8 may be opened.

[0033]

According to the present invention, the soundproof cover can be attached to the side surface of the outer surface of the engine body which is easy to attach. Moreover, since the internally generated sound is generally more easily transmitted to the side surface than to the other parts of the engine body, it is possible to provide a good soundproof effect by mounting the soundproof cover on the side surface.

Further, since the soundproof cover mounting mechanism can be formed integrally with the engine body, it is easy to form and the soundproof cover can be easily mounted.

[Brief description of the drawings]

FIG. 1 is a partial vertical cross-sectional view showing an example of an engine body to which a soundproof cover mounting mechanism of the present invention is applied.

FIG. 2A is a plan view showing an example of an elastic member that constitutes the soundproof cover mounting mechanism of the present invention, and FIG. 2B is a side view of FIG.

FIG. 3 (a) is a plan view showing an example of a cover cover constituting the soundproof cover attachment mechanism of the present invention, and FIG. 3 (b) is a sectional view taken along the line AA of FIG.

FIG. 4 is a perspective view showing an example of a cylinder head to which the soundproof cover mounting mechanism of the present invention is applied.

5 is a plan view of the cylinder head of FIG. 4. FIG.

FIG. 6 is a sectional view taken along line BB of FIG. 5;

FIG. 7 is a sectional view taken along line CC of FIG. 5;

8 is a cross-sectional view taken along line DD, EE, and FF of FIG.

FIG. 9 is a plan view showing an example of a conventional cylinder block.

10 is a cross-sectional view taken along the line GG of FIG.

Claims (1)

(57) [Claims] 1. A camshaft for an engine body of an internal combustion engine
Caused a substantially matching shape to the shape of the plate-like elastic member and the <br/> elastic member for vibration absorption to the shape of the outer side surface of the side shift operating chain is accommodated exhibits a shape that substantially matches 且 one elastic Of member
A soundproofing cover ing from the coated cover formed so as to cover the outer surface, projecting from the said outer surface, said elastic member and the covering cover
And a plurality of bosses for mounting over, corresponding to the bosses in the elastic member and the covering cover
Internal combustion engine with mounting holes drilled in
Soundproof cover attachment mechanism .