JP2000234562A - Cover structure for engine head cover - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To improve the soundproofing performance of a head cover part and enhance the functional beauty of an entire engine. Attach the external cover to the head cover, using a small number of bolts to prevent falling down. SOLUTION: In the engine 21 of the motorcycle, a head cover cover structure of the engine 21 in which a head cover 44 is covered by an external cover 70 provided with a sound absorbing material on the back.
A plurality of protrusions 62 are provided on the outer surface of the head cover 44, and grooves 72 on the inner surface of the outer cover 70 are fitted to these protrusions 62 via caps 69 as elastic materials. The outer cover 70 was attached to the head cover 44 by fixing the head 70 to the head cover 44 with bolts 84 at a portion different from the projections 62.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover structure in which an engine head cover is covered with an external cover.

[0002]

2. Description of the Related Art In some motorcycles, an engine head cover is further covered with an external cover. The purpose of covering the head cover with the external cover is to enhance the soundproofing performance of the head cover portion and enhance the functional beauty (functional appearance) of the engine.

For example, Japanese Unexamined Patent Publication No. Hei 4-327093 entitled "Soundproofing device for engine head cover" (Prior Art 1) has been proposed. According to the above prior art, according to FIG. 1 of the publication, the outer surface of a head cover 1 (the number is cited in the publication; the same applies hereinafter) is covered with a soundproof cover 2, and one of the soundproof covers 2 is provided. Is attached to the cylinder head 14 with the cover fixing bolt 10 described above. A sound absorbing material layer 4 is provided on the back of the soundproof cover 2, and an air layer 5 is provided between the sound absorbing material layer 4 and the soundproof cover 2.

On the other hand, in order to achieve the above, the head cover is further covered with an external cover to make it look like a large engine (Prior Art 2). Some users are pursuing the beauty of the engine mounted on motorcycles. Such a person thinks that a large engine enhances the functional beauty and desires it. Since a large external cover is provided to make the head cover look large, there is an air layer between the external cover and the head cover.

[0005]

The above-mentioned prior art 1 has the following problems.
Since the soundproof cover 2 is attached to the cylinder head 14, vibrations of the engine and vibrations caused by running on a road surface are transmitted to the soundproof cover 2 via the cylinder head 14. Therefore, consideration must be given to preventing the resonance of the soundproof cover 2. This is because the resilient soundproof cover 2 can be a noise source. It is preferable to prevent vibration of the soundproof cover 2 itself as much as possible. Further, in order to pursue the functional beauty of the engine, there are times when it is desired to mount the soundproof cover 2 in a state of being lifted from the cylinder head 14. In this case, there is room for improvement in preventing the soundproof cover 2 from falling down and improving the vibration prevention performance with only one set of the bolts and nuts 10 and 16. The same applies to the above-mentioned conventional technology 2.

Accordingly, it is an object of the present invention to provide (1) a cover structure for a head cover in which the soundproof performance of the head cover portion is high and the functional beauty of the entire engine is enhanced.
(2) An object of the present invention is to provide a cover structure for a head cover that can securely prevent the external cover from falling down with a small number of bolts and can be attached to the head cover.

[0007]

In order to achieve the above object, a first aspect of the present invention is an engine for a motorcycle having a head cover covered with an external cover having a sound absorbing material on the back. Are provided, and the grooves on the inner surface of the outer cover are fitted to these protrusions via an elastic material, and the outer cover is bolted to the head cover at a portion different from the protrusions. Is attached to the head cover.

[0008] By covering the head cover with an external cover having a sound absorbing material on the back, the soundproofing performance of the head cover portion is enhanced and the functional beauty of the entire engine is enhanced. Since the grooves are fitted to the plurality of convex portions via the elastic material, the external cover can be reliably prevented from falling down with a small number of bolts, and can be attached to the head cover.

According to a second aspect of the present invention, a plurality of convex portions are arranged on a side surface of the head cover. The fall of the outer cover can be prevented more reliably.

According to a third aspect of the present invention, the outer cover is a two-part cover that can be divided in the vehicle width direction of the motorcycle, and the two-part cover is bolted from right and left. When the engine mounted on the motorcycle is maintained or inspected, the outer covers can be easily attached and detached from the left and right sides of the vehicle body.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that "before", "after",
“Left”, “right”, “up”, and “down” follow the direction seen from the driver, and Fr is the front side, Rr is the rear side, L is the left side, R is the right side, and CL is the center of the vehicle (center of vehicle width). Is shown. Also, the drawings should be viewed in the direction of reference numerals.

FIG. 1 is a right side view of a motorcycle according to the present invention. The motorcycle 10 has a cradle-type body frame 11, a front fork 13 rotatably attached to a head pipe 12 of the body frame 11, a front wheel 14 attached to a lower portion of the front fork 13, and an upper portion of the front fork 13. Handle 15 and body frame 1
1, a fuel tank 16 mounted so as to straddle the front upper part,
Front and rear seats 1 mounted on the upper rear part of the body frame 11
7, 18; an engine 21 disposed in a cradle space of the body frame 11, a transmission 22 provided integrally with the engine 21, and a swing arm 23 attached to a lower portion of an intermediate portion of the body frame 11 so as to be swingable; It comprises a rear suspension unit 24 in which a swing arm 23 is suspended on the vehicle body frame 11, and a rear wheel 25 attached to the swing arm 23.

In the figure, 27 is a mirror, 28 is a speedometer, 29 is a headlamp, 31 is a front fender, 3
2 is a radiator, 33 and 33 are carburetors, 34 and 34
Is an exhaust pipe, 35 is a muffler, 36 is a rear step, and 37 is a rear fender.

FIG. 2 is a right side view (partial cross section) of the engine and the transmission according to the present invention. The engine 21 is a V-type two-cylinder engine having front and rear cylinders 41, 41. The engine 21 includes two cylinder heads 43, 43 and two head covers 44, 44 at an oblique upper portion of a cylinder block 42, and each head cover 44, 44 is provided outside. These are individually covered with covers 70, 70. Hereinafter, the front cylinder head 43
The head cover 44 and the outer cover 70 will be described. Note that the later cylinder head 43 and head cover 44
And the outer cover 70 has the same configuration as before, and thus the description thereof will be omitted. In the figure, 45 and 45 are pistons.

FIG. 3 is a sectional view of an essential part of the engine according to the present invention, wherein a front cylinder head 43 and a head cover 44 are provided.
2 shows a combined structure of the outer cover 70 and the outer cover 70. According to the present invention, the outer cover 70 is a cover that is opened downward,
0 to cover the head cover 44, the engine 2
1 is characterized by making it look like a large engine. Since the head cover 44 is covered with the large external cover 70, there is a predetermined gap S (air layer) between the head cover 44 and the external cover 70. Further, the external cover 70 is lifted from the cylinder head 43 while the head cover 4
4 attached.

In this figure, the outer cover 70 is a cover which is open downward, a plurality of grooves (upper grooves 72..., Side grooves 73...) Are provided on the inner surface of the outer cover 70, and the head cover 4 is formed.
4 has a plurality of convex portions (upper convex portions 62..., Side convex portions 65).
..), And upper and side grooves 72... 73 are fitted to these upper and side protrusions 62... 65 through caps 69. It shows that the outer cover 70 is supported. In addition,
"..." indicates a plurality (the same applies hereinafter).

More specifically, the head cover 44 has a plurality of pin-shaped upper protrusions 62 extending upward on the upper surface and a plurality of pin-shaped side protrusions 6 extending laterally on the side surface.
5 are arranged. These upper and side projections 6
2 and 65 are integrally formed on the head cover 44, and caps 69 are placed on the tips of the upper and side projections 62 and 65. The caps 69 are, for example, elastic materials such as soft rubber and soft resin. Further, the outer cover 70 has upper grooves 72 formed at positions opposed to the respective tips of the upper projections 62 and formed side grooves 73 at positions opposed to the respective ends of the side projections 65. It was done.
In the figure, 51 is an intake port, 52 is an exhaust port, 53 is a cam shaft, 54 and 54 are rocker arms, 55 is an intake valve, 5
6 is an exhaust valve.

FIG. 4 is a sectional view taken along the line 4-4 in FIG. 3. The outer cover 70 is a two-part cover that can be divided in the vehicle width direction (left-right direction) of the motorcycle. It is shown that it consists of a certain left half 71L and a right half 71R. The outer cover 70 is provided with a plurality of sound absorbing materials 81 on the back, and is attached to the head cover 44 to be mounted on the left half 71.
The split surfaces 76, 76 between the L and the right half 71R are sealed with packing 82. The sound absorbing members 81 are for improving the soundproofing performance of the head cover 44 by absorbing noise leaking from the head cover 44, and are made of, for example, a polyurethane foam sheet having a predetermined thickness. Such sound absorbing materials 81 are attached to appropriate portions so that the sound absorbing effect is increased with a small amount of material. The sound absorbing material 81 is provided on the entire back surface of the outer cover 70.
May be pasted.

FIG. 5 is a sectional view taken along line 5-5 of FIG. 3, in which the outer cover 70, which is a two-part cover, is
, 65... (See FIG. 3) indicates that the outer cover 70 is attached to the head cover 44 by bolting it to the head cover 44 from the left and right. More specifically, the head cover 44 has a plurality of screw holes 67 formed on both left and right side surfaces 66. On the other hand, the left and right halves 71L, 71R are provided with a plurality of bolt holes 75 on the left or right side surface 74, 74 facing the screw holes 67, respectively.
Grommets (elastic bushes) 83... As elastic materials are fitted into these bolt holes 75. The bolts 84 are screwed into the screw holes 6 through the grommets 83.
7, the external cover 70 can be attached to the head cover 44. Grommet 83 ...
Is an elastic material product such as a soft rubber or a soft resin, for example. 85 ... are spacers, 86 ... are washers.

FIG. 6 is a schematic exploded plan view of the head cover and the outer cover according to the present invention.
The relationship between 2 ..., 65 ... and the upper / side grooves 72 ..., 73 ... is shown. In this figure, the head cover 44 is a substantially rectangular cover in plan view, and four upper convex portions 6 are provided near four corners of the upper surface 61 thereof.
2 are arranged, and two side projections 65 are arranged on the left and right sides of the front side surface 63 and the left and right sides of the rear side surface 64, respectively. On the other hand, the left half 71L of the outer cover 70 is
The directions of the openings of the upper and side grooves 72... 73 are set so as to cover the head cover 44 from the left side in the vehicle width direction. Specifically, two upper and lower upper grooves 72.
Are generally U-shaped grooves in plan view with the head cover 44 side opened, and two front and rear side grooves 73 are substantially L-shaped grooves in plan view with the head cover 44 side opened. The right half 71R is
The left half 71L is a symmetrical member, and a detailed description thereof will be omitted. Therefore, when the left and right halves 71L and 71R are moved from the left and right toward the head cover 44, the upper grooves 72 can be fitted into the upper protrusions 62, and the side grooves 65 can be fitted into the side protrusions 65. 73 ... can be fitted.

Further, the upper and side grooves 72, 73,.
The groove is closed at the top (front side of the drawing) and open at the bottom (back side of the drawing). Therefore, left and right half 7
Even when the 1L and 71R are moved from above toward the head cover 44, the upper grooves 72 can be fitted into the upper convex portions 62, and the side grooves 73 can be fitted into the side convex portions 65. be able to. Thus, the left and right halves 71L, 71R
Can be put on the head cover 44 from above or from the left and right.

FIGS. 7A and 7B are diagrams showing the left half of the outer cover according to the present invention. FIG. 7A shows the inner surface of the left half 71L, and FIG. 4 shows a cross section taken along line bb. This figure shows that sound absorbing members 81 having a predetermined thickness are attached to the upper surface, the front surface, and the left side surface on the back of the left half. Further, this figure shows that the upper ends of the upper / side grooves 72... 73 are closed.

FIG. 8 is an exploded perspective view and assembly explanatory view of the head cover and the outer cover according to the present invention. To attach the external cover 70 to the head cover 44, the following (1)-
According to the procedure of (8). The assembling procedure is described in order to facilitate understanding of the above configuration.
It is not limited to the following procedure.

(1) A cap 69 is fitted to the upper and side projections 62... 65 of the head cover 44. (2) In the bolt holes 75 of the left and right halves 71L, 71R,
Grommets 83 are fitted. (3) The left half 71L is placed on the left half of the head cover 44 from the left in the vehicle width direction. (4) The upper / side grooves 72, 73,... Are fitted to the left upper / side protrusions 62, 65,.

(5) Insert the grommet 8 into the left screw holes 67.
The left half 71L is attached to the head cover 44 by screwing bolts 84 through 3. (6) The right half 71R is placed on the right half of the head cover 44 from the right side in the vehicle width direction, and a seal 82 is interposed between the split surfaces 76, 76 of the left and right halves 71L, 71R for sealing. (7) The upper / side grooves 72, 73,... Are fitted to the right upper / side protrusions 62, 65,. (8) Screw the bolts 84 through the grommet 83 into the right screw holes 67 so that the head cover 44
The right half 71R. Thus, the assembling work is completed.

Next, the operation of the engine head cover structure having the above-described structure will be described. (1) As shown in FIG. 2, since the head covers 44, 44 are covered with the external covers 70, 70 provided with sound absorbing materials 81 on the back, the soundproof performance of the head covers 44, 44 can be improved. In particular, when the small displacement engine is mounted on the motorcycle 10 (see FIG. 1), the running noise (engine noise) generated when the engine 21 runs at a high speed is a high frequency range sound. It is relatively easy to suppress such noise by the outer covers 70, 70 having the sound absorbing materials 81 on the back, which is effective for suppressing noise.

(2) Further, the head covers 44, 44
Is covered with relatively large external covers 70, 70, the engine 21 can be made to look like a large engine. As a result, the functional beauty (functional appearance) of the entire engine 21 can be enhanced.

(3) As shown in FIG.
4 are provided with a plurality of upper / side convex portions 62, 65,..., And the upper / side convex portions 62, 65,. 72
, 73 ... were fitted. Further, the outer cover 70 is fixed to the head cover 44 with bolts 84 at a portion different from the upper and side convex portions 62, 65,. Since the outer cover 70 is attached to the head cover 44 in this manner, the outer cover 70 can be supported by a large number of upper and side convex portions 62, 65,. Even though the cover 70 is in a floating state, the external cover 70 can be securely mounted on the head cover 44 with a small number of bolts 84. In addition, since the outer cover 70 is supported and attached to the head cover 44 via the caps 69 and the grommets 83, the vibration of the engine 21 (see FIG. 5) and the vibration accompanying the road surface travel are transmitted from the head cover 44. This can be further prevented, and the vibration prevention performance of the outer cover 70 is high.

(4) Left and right side surfaces 6 of the head cover 44
6, 66 (only one is shown in this figure), a plurality of side protrusions 65 are arranged, so that the fall of the outer cover 77 can be more reliably prevented.

(5) Since the outer cover 70 is a two-part cover that can be divided in the vehicle width direction of the motorcycle, and the two-part cover is fixed with bolts 84 from the left and right, as shown in FIG. Engine 21 mounted on 10
When performing maintenance and inspection of the vehicle, the outer cover 70 can be easily attached and detached from the left and right sides of the vehicle body. Therefore, engine 2
(1) Maintenance and inspection workability is improved.

In the above embodiment of the present invention,
(1) The motorcycle 10 may be a motorcycle. (2) Upper / side protrusions 62, 65 and upper / side groove 72,
The elastic material interposed between the upper and side convex portions 62, 6
What is necessary is just to reduce or block the vibration between 5 and the upper / side grooves 72, 73, and it is not limited to the cap 69. (3) The outer cover 70 is provided with a sound absorbing material 81 on the back,
What is necessary is just to cover the head cover 44 in order to enhance its functional beauty, and the shape, dimensions and material are arbitrary. (4) The elastic material interposed when the bolt 84 is tightened into the screw hole 67 may be any material that can reduce or block vibration between the head cover 44 and the outer cover 70, and is not limited to the grommet 83. . (5) Upper / side protrusions 62, 65, upper / side groove 72,
The arrangement, number, shape, size, and material of the bolts 73 and the bolts 84 are arbitrary. Further, replacing the bolt 84 with various fastening members is optional.

[0032]

According to the present invention, the following effects are exhibited by the above configuration. In the first aspect, since the head cover is covered with the external cover having the sound absorbing material on the back, the soundproof performance of the head cover portion can be improved and the functional beauty of the entire engine can be improved. In particular, when a small-displacement engine is mounted on a motorcycle, it is effective for suppressing running noise generated when the engine runs at a high speed. Furthermore, a plurality of convex portions are provided on the outer surface of the head cover, and the grooves on the inner surface of the outer cover are fitted to these convex portions via an elastic material, and the external cover is attached to the head cover at a portion different from the convex portions. Since the external cover is attached to the head cover by bolting, the external cover can be reliably prevented from falling down with a small number of bolts and can be attached to the head cover.

According to the second aspect, since the plurality of convex portions are arranged on the side surface of the head cover, the fall of the external cover can be more reliably prevented.

According to a third aspect of the present invention, the outer cover is a two-part cover that can be divided in the vehicle width direction of the motorcycle and the two-part cover is bolted from the left and right, so that the engine is mounted on the motorcycle. When performing maintenance and inspection,
The external cover can be easily attached and detached from the left and right sides of the vehicle body. Therefore, the maintenance and inspection workability of the engine is enhanced.

[Brief description of the drawings]

FIG. 1 is a right side view of a motorcycle according to the present invention.

FIG. 2 is a right side view (partial cross section) of the engine and the transmission according to the present invention.

FIG. 3 is a sectional view of an essential part of an engine according to the present invention.

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a sectional view taken along line 5-5 in FIG. 3;

FIG. 6 is a schematic exploded plan view of a head cover and an outer cover according to the present invention.

FIG. 7 is a configuration diagram of a left half of the outer cover according to the present invention.

FIG. 8 is an exploded perspective view and assembly explanatory view of a head cover and an outer cover according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... motorcycle, 21 ... engine, 44 ... head cover, 62 ... convex part (upper convex part), 65 ... convex part (side convex part), 69 ... elastic material (cap), 70 ... outer cover (two-part cover) ), 71L: left half, 71R: right half,
72: groove (upper groove); 73: groove (side groove); 81: sound absorbing material; 84: bolt.

Claims (3)

[Claims] 1. An engine for a motorcycle in which a head cover is covered with an external cover having a sound absorbing material on the back, wherein a plurality of convex portions are provided on an outer surface of the head cover, and these convex portions are provided with an elastic material. A head cover for the engine, wherein the outer cover is attached to the head cover by fitting the groove on the inner surface of the outer cover to the head cover at a position different from the convex portion. Cover structure. 2. The cover structure for an engine head cover according to claim 1, wherein said plurality of projections are arranged on a side surface of said head cover. 3. The motorcycle according to claim 1, wherein the outer cover is a two-part cover that can be divided in a vehicle width direction of the motorcycle, and the two-part cover is bolted from right and left. Cover structure for engine head cover.