JP2886208B2 - Structure of motorcycle components - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a structure for arranging components of a motorcycle.

(Prior Art) Conventionally, the structure of disposing components of a motorcycle is disclosed in
There is one disclosed in Japanese Patent Application No. 92979.

According to the above publication, a body frame of a motorcycle has a head pipe constituting a front end thereof, and a pair of left and right main frames extending substantially linearly from the head pipe rearward and downward in a side view. Each of these main frames is formed in a box shape having a vertically long cross section, and a cross pipe is provided for connecting the middle portions of the main frames in the front-rear direction to each other.

Further, rear arm brackets extend downward from the rear ends of the main frames. A shock absorber is provided on these left and right rear arm brackets, on which a rear arm is pivotally supported to swing up and down, a front end is pivotally supported by the body frame, and a rear end is pivotally supported by the rear arm. Is provided.

An engine is disposed below the left and right main frames, and a carburetor is connected to a cylinder of the engine, and an air cleaner is connected to the carburetor. The upper part of the engine cylinder is supported by the cross pipe, while the rear part of the engine is supported by left and right rear arm brackets. In plan view, the left and right main frames and the pivot shaft are formed so as to have a substantially isosceles triangular shape having the pivot shaft as a base, and a sheet extending in the front-rear direction above the shock absorber is arranged. Has been established.

(Problems to be Solved by the Invention) In the prior art, the support of the engine on the vehicle body frame and the pivotal support of the shock absorber on the vehicle body frame are formed by separate support means. The configuration is complicated.

When the motorcycle runs, a large impact force is applied to the shock absorber in the longitudinal direction from the body frame side and the rear arm side. At this time, the shock absorber is moved in the longitudinal direction in the shock absorber. While acting to absorb the force, a reaction force against the impact force is applied to the vehicle body frame 2. For this reason, the body frame
Sufficient strength is required to strongly support the reaction force from the shock absorber.

However, according to the conventional technique, the front end of the shock absorber is
Because it is pivotally supported by the protruding end of the bracket that is protruded from the main frame of the body frame and is cantilevered, the strength of the body frame is increased by trying to strongly support the reaction force from the shock absorber. It is not easy to improve.

Further, in order to facilitate the handling of the motorcycle, it is desired that the components of the motorcycle be compactly arranged to make the body smaller.

(Object of the Invention) The present invention has been made in view of the above circumstances, and when an engine or a shock absorber is supported on a vehicle body frame, a configuration for supporting the engine and the shock absorber is simplified. The purpose of the present invention is to further improve the strength of the vehicle body frame for strengthening the support and to make each component part of the motorcycle more compact, thereby making the vehicle body smaller. And

(Structure of the Invention) A feature of the present invention for achieving the above object is that a body pipe 2 has a head pipe 3 constituting a front end thereof, and a substantially rearwardly downward view from the head pipe 3 in a side view. It has a pair of left and right main frames 4, 4 extending linearly, and these main frames 4, 4 are formed in a box shape having a vertically long cross section, and the middle portions in the front-rear direction of these main frames 4 are connected to each other. And a cross pipe 5 for each main frame.
The rear arm brackets 7 extend downward from the rear ends of the right and left rear arm brackets 7, 4, respectively.
7, a pivot shaft 11 is erected, and the rear arm 12 is
And a shock absorber 19 whose front end is pivotally supported by the body frame 2 and whose rear end is pivotally supported by the rear arm 12. The engine 2 is provided below the left and right main frames 4, 4.
5, a carburetor 40 is connected to the cylinder 28 of the engine 25, an air cleaner 41 is connected to the carburetor 40, and the upper part of the cylinder 28 of the engine 25 is supported by the cross pipe 5, The rear part of the engine 25 is supported by the left and right rear arm brackets 7, 7, and in plan view,
The left and right main frames 4, 4 and the pivot shaft 11 are formed in a substantially isosceles triangular shape having the pivot shaft 11 as a base, and a sheet 76 extending in the front-rear direction above the shock absorber 19 is arranged. (1) The front end of the shock absorber 19 is pivotally supported by the cross pipe 5, (2) The shock absorber 19 is disposed between the left and right main frames 4, 4, and When viewed, the main frame 4, 4 is inclined rearward and downward so as to be substantially parallel to the main frames 4, 4. (3) The side pipe is surrounded by the cross pipe 5, the shock absorber 19, and the cylinder 28 of the engine 25. Above vaporizer in space
(4) The air cleaner 41 is disposed in the space between the rear upper part of the shock absorber 19 and the lower part of the seat 76, and the air cleaner 41 is inverted U-shaped when viewed from the front. The air cleaner 41 is provided so as to straddle the rear part of the shock absorber 19, and one side of the air cleaner 41 is communicated with the carburetor 40 outside the shock absorber 19.

(Operation) The operation of the above configuration is as follows.

The body frame 2 has a head pipe 3 constituting a front end thereof, and a pair of left and right main frames 4 extending substantially linearly from the head pipe 3 rearward and downward in a side view. The main frames 4, 4 are formed in a box shape having a vertically long cross section, and a cross pipe 5 for connecting the middle portions of the main frames 4 in the front-rear direction to each other is provided.
4 extend rear arm brackets 7 downward from the rear ends, respectively.
And a rear arm 12 is pivotally supported on the pivot shaft 11 so that the rear arm 12 can swing up and down.
Shock absorber whose pivot is pivotally supported by the rear arm 12
19, the engine 25 below the left and right main frames 4, 4
The carburetor 40 is connected to the cylinder 28 of the engine 25, and the air cleaner 41 is connected to the carburetor 40. The upper part of the cylinder 28 of the engine 25 is supported by the cross pipe 5. The rear part of the engine 25 is supported by the left and right rear arm brackets 7, 7, so that the left and right main frames 4, 4 and the pivot shaft 11 are substantially isosceles triangles having the pivot shaft 11 as a base in plan view. And that a sheet 76 extending in the front-rear direction is disposed above the shock absorber 19 as a "precondition". (1) The front end of the shock absorber 19 is pivotally supported by the cross pipe 5.

For this reason, since the cross pipe 5 is also used for supporting the engine 25 with respect to the body frame 2 and for pivoting the shock absorber 19, a bracket for pivoting the shock absorber 19 is separately provided. The structure of the motorcycle 1 is simpler than that of the first embodiment.

In addition, the front end of the shock absorber 19 is pivotally supported by the cross pipe 5 supporting the upper part of the cylinder 28 of the engine 25.
25 and the shock absorber 19 come closer to each other.

Therefore, in general, since the engine 25 and the shock absorber 19 are heavy, the concentration of the mass of the vehicle body can be more reliably achieved by the approach of the two 25, 19 described above.

Further, as shown in the above "Prerequisites", the cross pipe 5 connects the main left and right frames 4, 4 and is supported at both ends by the main frames 4, 4, as described above. Since the front end of the shock absorber 19 is pivotally supported by the cross pipe 5, the pivotal support of the shock absorber 19 with respect to the vehicle body frame 2 becomes strong.

(2) The shock absorber 19 is connected to the left and right main frames 4,4.
Between the main frame 4,
The rearwardly inclined posture is set so as to be substantially parallel to 4, and the following operation occurs.

That is, when the motorcycle 1 runs, the shock absorber
Since both ends of the shock absorber 19 are pivotally supported, the impact force applied to the shock absorber 19 from the cross pipe 5 side and the rear arm 12 side is directed to the longitudinal direction of the shock absorber 19, and at this time, the shock absorber 19 Numeral 19 acts to absorb the impact force, and applies a reaction force to the impact force to the left and right main frames 4, 4 of the body frame 2 via the cross pipe 5 shown in (1) in the longitudinal direction. It will be.

Here, as described above, since the shock absorber 19 is substantially parallel to each of the main frames 4, 4, the reaction force of the impact force applied to the shock absorber 19 in the longitudinal direction is equal to this. It is given in the longitudinal direction of the left and right main frames 4, 4 substantially parallel to the shock absorber 19, that is, a moment is applied to the main frames 4, 4 based on the reaction force from the shock absorber 19. Is suppressed.

Therefore, the strength of the vehicle body frame 2 for supporting the reaction force from the shock absorber 19 is further improved.

(3) The cross pipe 5 and the shock absorber in a side view.
The carburetor 40 is disposed in a space surrounded by the cylinder 19 and the cylinder 28 of the engine 25, and the following operation is performed.

That is, as shown in the above "Prerequisites", the cross pipe 5 connects the middle parts of the main frames 4, 4 in the front-rear direction with each other, while the cross pipes 5 connect the main frames 4, 4 with each other.
The engine 25 is disposed below the engine, and the upper part of the cylinder 28 of the engine 25 is supported by the cross pipe 5. Further, as shown in the above (1) and (2), the shock absorber
Reference numeral 19 denotes a front end pivotally supported by the cross pipe 5 and disposed between the left and right main frames 4, 4.
Since the main frames 4 and 4 are substantially parallel to each other, an excess space tends to be generated in a portion surrounded by the cross pipe 5, the shock absorber 19, and the cylinder 28 of the engine 25.

Therefore, as described above, the carburetor 40 is disposed in a space surrounded by the cross pipe 5, the shock absorber 19, and the cylinder 28 of the engine 25 in a side view.
Each component of the motorcycle 1 is compactly disposed because the surplus space is effectively used for disposing the carburetor 40.

(4) The rear upper part of the shock absorber 19 and the seat 76
The air cleaner 41 is disposed in a space between the air cleaner 41 and the lower part of the air cleaner 41, and the air cleaner 41 is formed in an inverted U shape in a front view so as to straddle the rear part of the shock absorber 19, and The side is outside the buffer 19 and the vaporizer 40
And the following operation occurs.

That is, as shown in the above (2), the shock absorber 19 has a rearwardly inclined posture, while the seat 76 extending in the front-rear direction above the shock absorber 19 as shown in the above "Precondition". Due to the arrangement, an excess space tends to be formed between the rear portion of the shock absorber 19 and the seat 76.

Therefore, as described above, the rear portion of the shock absorber 19 and the seat
An air cleaner 41 is disposed in a space between the air cleaner 41 and the air cleaner 41. The air cleaner 41 is formed in an inverted U shape when viewed from the front and provided so as to straddle the rear part of the shock absorber 19. Was communicated to the carburetor 40 outside the shock absorber 19, so that the space between the shock absorber 19 and the sheet 76 was effectively used for disposing the air cleaner 41, and The left and right sides of the shock absorber 19 are effectively used for disposing the air cleaner 41, and accordingly, the components of the motorcycle 1 are disposed compactly.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

1 to 4, reference numeral 1 denotes a motorcycle and reference numeral 2 denotes a body frame thereof.

The body frame 2 has a head pipe 3 at a front portion thereof, and left and right main frames 4, 4 made of sheet metal and having a box-like shape having a vertically long cross section from the head pipe 3 toward the rear downward, are substantially straight lines in plan view. Each of the left and right main frames 4, 4 is firmly connected to each other in the front-rear direction by a cross pipe 5.

Rear arm brackets 7 extend downward from the rear ends of the main frames 4, respectively, and the upper and lower portions of the left and right rear arm brackets 7, 7 are upper and lower, respectively.
The lower cross tubes 8 and 9 are firmly connected to each other.
A pivot shaft 11 is detachably mounted on the left and right rear arm brackets 7, 7 between the upper and lower cross tubes 8, 9, and a rear arm 12 is pivotally supported on the pivot shaft 11 so as to swing up and down. ing.

Down tubes 13 extend below the main frames 4, 4 from the front ends of the main frames 4, 4 toward the rear and lower.

A front fork 15 is pivotally supported on the head pipe 3 so as to be steerable. And this front fork 15
The front wheel 16 is supported at the lower end of the front fork 15
The handle 17 is attached to the upper end of.

On the other hand, a rear wheel 18 is supported on the swinging end of the rear arm 12. Reference numeral 19 denotes a shock absorber. The shock absorber 19 is provided between the rear portions of the left and right main frames 4, 4 and has a downwardly inclined posture so as to be substantially parallel to the main frames 4, 4 in a side view. ing. The front end of the shock absorber 19 is pivotally supported by a front pivot shaft 21 with respect to the cross pipe 5 of the vehicle body frame,
The rear end is pivotally supported by a rear pivot shaft 23 on a link mechanism 22 provided across the rear arm bracket 7 and the rear arm 12. The shock absorber 19 absorbs an impact force transmitted from the rear wheel 18 to the vehicle body frame 2 via the rear arm 12.

An engine 25 is provided below the left and right main frames 4,4. The engine 25 is a two-stroke single-cylinder engine, and a power transmission 27
A cylinder 28 projects from the upper surface of the crankcase 26 toward the front and upper direction, and the cylinder 28
A cylinder head 29 is mounted on the top, and these 26, 28, 29
Are detachably screwed to each other.

The upper end of the cylinder 28 is screwed to the cross pipe 5 with a bolt 30 via the cylinder head 29 and is supported by the left and right main frames 4, 4. The front end of the crankcase 26 is The lower end of each down tube 13 is screwed, and the rear end of the power transmission device 27 is supported by the pivot shaft 11, that is, the power transmission device 27
The rear portion of the engine 25 is supported by the left and right rear arm brackets 7, 7 via the, so that the engine 25 is firmly supported by the body frame 2. A drive chain wheel 32 is provided on the power transmission device 27 side while the rear wheel 18
Is mounted with a driven chain wheel 34, and a transmission chain 35 is wound around the both wheel chains 33, 34.

In the above case, loosen each bolt 30, 31 and
By removing the vehicle from the rear arm bracket 7, the engine 25 can be removed from the body frame 2. Further, the left and right main frames 4, 4 and the pivot shaft 11 are formed in a substantially isosceles triangular shape having the pivot shaft 11 as a base in a plan view. The left and right main frames 4, 4 support external forces transmitted to the frames 4, 4 as axial forces.

Further, the left and right main frames 4, 4 are bent at a portion corresponding to the cylinder 28, and the bent portion 4a is slightly bulged outward, so that the cylinder 28 or the cylinder head 29 is The engine 25 is brought closer to a seat 76 described later to a position that is located in a space surrounded by the cross pipes 4 and 4 and does not overlap with these. For this reason, when attempting to remove the cylinder head 29, for example, during maintenance and inspection of the cylinder 28, first release the screwing of the cylinder head 29 to the cylinder 28, and then lift the cylinder head 29 to remove it. Can be passed through the left and right main frames 4, 4 and removed from the vehicle body. Further, the cylinder 28 can be removed in the same manner as described above.

Note that, as described above, the main frame 4 has the bent portion 4a.
However, since the main frame 4 is box-shaped in section and has high rigidity, sufficient rigidity is maintained even when the bent portion 4a is provided as described above. Further, since the bent portion 4a is bulged outward, the protection of the engine 25 is more reliably performed.

A seat rail 37 protrudes from the rear ends of the left and right main frames 4, 4 toward the rear upper side. The seat rail 37 is firmly supported by the rear arm bracket 7 by a pair of left and right back stays 38.

On the other hand, a carburetor 40
Are connected, and an air cleaner 41 is connected to the carburetor 40. An intake port is formed on the rear surface of the cylinder 28, and the carburetor 40 and the air cleaner 41 are sequentially connected to the intake port. In this case, in a side view (FIG. 1), the carburetor is placed in a space surrounded by the cross pipe 5, the shock absorber 19, and the cylinder 28 of the engine 25.
Forty are arranged.

In particular, as shown in FIG. 5, the cleaner case 42 of the air cleaner 41 has an inverted U-shaped cross section and is supported by the seat rail 37 across the rear portion of the shock absorber 19. In addition, an intake hole 43 is formed, and an element 44 for closing the intake hole 43 is provided. One side (right side) of the air cleaner 41 communicates with the carburetor 40 outside the shock absorber 19.

A fuel tank 46 for supplying fuel to the carburetor 40 is provided. This fuel tank 46 is made of resin, and the left and right main frames 4,
4, the fuel tank 46 has a pair of right and left cushioning members 47, 47, as shown in FIG. 1 and FIG.
The left and right main frames 4 are supported by rubber mounts on the cross members of the left and right main frames 4. A cap 48 for opening and closing the fuel inlet is provided on the front upper surface of the fuel tank 46.

In particular, in FIGS. 1 and 7, the rear part of the fuel tank 46 has an inverted U-shaped cross section and straddles the shock absorber 19, and a fuel cock 49 is attached to the right side thereof. The fuel in the tank 46 is supplied to the carburetor 40 through the fuel cock 49. The fuel cock 49 is opened and closed through an operation hole 50 formed in the right main frame 4. In FIG. 7, reference numeral 52 denotes a shock absorber 19.
53 is the kick pedal of the kick starter.

Also, as described above, the bent portion of each main frame 4
Utilizing the fact that 4a is bulged outward, the width of the fuel tank 46 between the left and right main frames 4, 4 is widened to reduce the center of gravity. The fuel tank 46 is provided corresponding to the rear half of each main frame 4.

In all figures, a sheet metal exhaust pipe 55 is connected to an exhaust port formed on the front surface of the cylinder 28. The exhaust pipe 55 has a pipe main body 56 extending from the exhaust port. The pipe main body 56 is formed at the front of the lower ends of the left and right down tubes 13, 13, after forming a loop, once outside the lower end of the left down tube 13. , And extends upward, and a muffler 57 is connected to this upper end. This muffler
57 is disposed in the space formed between the left main frame 4 and the left side of the crankcase 26 outside the cylinder 28 and the left side of the carburetor 40, as shown in FIG.

Also, a connecting pipe 58 extends rearward from the rear end of the muffler 57.
The connecting pipe 58 is connected to the left rear arm bracket 7.
And the buffer 19 pass through the space created. A silencer 59 is connected to the rear end of the connection pipe 58. The silencer 59 is disposed in a space formed between the rear arm 12 and each left side of the seat rail 37.

By the way, the body frame 2 does not include the conventionally provided tension pipe gas, and the excess space of the vehicle body is widened accordingly. Therefore, the pipe main body 56 is provided by using the surplus space, and the muffler 57 has a large volume, but the muffler 57 is provided without difficulty in front of the rear arm bracket 7.

Thus, when the engine 25 operates, outside air is absorbed through the air cleaner 41, and this is
Is mixed with fuel supplied from the fuel cock 49 through a fuel cock 49, and the air-fuel mixture is sucked into the cylinder 28, where it is burned. And the combustion gas is exhaust pipe
The engine 25 is exhausted through the power transmission device 55 and the power generated by the engine 25 through the power transmission device 27 and the transmission chain 35.
18 and the motorcycle 1 can run.

1, 4 and 6, a device for cooling the cylinder 28 by water cooling is provided. This device has a radiator 61, and the upper part of the radiator 61 is a portion bulging outward in the left and right main frames 4, 4,
That is, the radiator 61 is provided between the down tubes 13, 13, and the lower portion of the radiator 61 is provided between the front portions of the main frames 4, 4.

A bracket 62 is installed between the front ends of the left and right main frames 4, 4, and a columnar cushioning material 63 is provided at the center of the bracket 62.
Is attached. A locking pin 64 protruding from an upper end of the radiator 61 is removably fitted into the cushioning member 63. The lower portion of the radiator 61 is screwed to the lower ends of the left and right down tubes 13, 13 via a buffer 67 with a pair of left and right bolts 66, 66, respectively.
As a result, the radiator 61 is
It is detachably screwed to. An electric motor-driven cooling fan 65 is provided corresponding to the rear surface of the radiator 61.
Is provided.

A lower end of an injection pipe 68 for injecting cooling water is connected to an upper part of the radiator 61, and an upper end side of the injection pipe 68 extends upward between front ends of the left and right main frames 4, 4, and a cap 69 is provided at an upper end thereof. Installed. Further, the lower end of the radiator 61 is connected to a cooling water pump 71 attached to the right end of the crankcase 26 by a feed pipe 72, and the cooling water in the radiator 61, in which the cooling fan 65 is cooled by traveling wind, The cooling water is pumped into the cylinder by the cooling water pump 71 to cool the cylinder. Further, the upper end of the cylinder head 29 is connected to the upper part of the radiator 61 by a return pipe 73, and the cooling water after cooling the cylinder 28 is supplied to the return pipe 73.
Through to the radiator 61.

In the above case, the left and right main frames 4, 4 and the down tube 13,
The engine 13 and the engine 25 have a quadrangular pyramid shape with the engine 25 as a base, that is, the configuration of these has a rigid structure. For this reason, the radiator 61 surrounded by them is sufficiently protected from external force from outside the vehicle.

In FIG. 1 and FIGS. 5 to 7, the upper surfaces of the left and right main frames 4, 4 and the upper surface of the fuel tank 46 are substantially the same height, and are substantially parallel to each other. The upper surfaces of the fuel tank 46, the cleaner case 42, and the seat rail 37 are formed so as to draw a gentle arc in a side view, and a resin cover that entirely covers the upper surfaces from above. A body 75 is provided, and the cover body 75 is provided.
Are firmly and detachably attached to the left and right main frames 4, 4 and the seat rail 37.

A rubber plate is fixed to the upper surface of the cover body 75 corresponding to the cleaner case 42 and the seat rail 37, and serves as a sheet 76 extending in the front-rear direction. The sheet 76 is disposed above the shock absorber 19. Have been. In this case, a halfway portion in the vehicle width direction of the air cleaner 41 is disposed in a space between the rear upper portion of the rearwardly falling shock absorber 19 and the lower portion of the seat 76. Further, a rear fender 77 is integrally formed at the rear end of the cover body 75.

In addition, 78 is a footrest, 79 is a sheet metal engine guard, and the front end of the engine guard 79 is screwed to the lower ends of the left and right down tubes 13, 13 with bolts 80, and the rear end is connected to the lower cross tube 9 with bolts 81. Screwed. A cushioning member 82 is provided between the lower surface of the power transmission device 27 and the engine guard 79. The engine guard 79 securely protects the engine 25 and the power transmission device 27, and the engine guard 79 rigidly connects the left and right down tubes 13, 13, thereby forming the down tubes 13, 13. Strength has been improved.

(Effects of the Invention) According to the present invention, a head pipe whose body frame constitutes a front end thereof, and a pair of right and left main frames extending substantially linearly from the head pipe rearward and downward in side view. Each main frame is formed in a box shape having a vertically long cross section, and a cross pipe is provided for connecting the middle portions in the front-rear direction of the main frames to each other, and the rear arms are respectively directed downward from the rear ends of the main frames. A bracket is extended, a pivot shaft is erected on these left and right rear arm brackets, and the rear arm is pivotally supported on the pivot shaft so that the rear arm can swing up and down. The front end is pivotally supported by the body frame and the rear end is the rear arm. The engine is arranged below the left and right main frames, a carburetor is connected to a cylinder of the engine, and an air cleaner is attached to the carburetor. And the upper part of the cylinder of the engine is supported by the cross pipe, and the rear part of the engine is supported by the left and right rear arm brackets. It is assumed that a sheet is formed so as to have a substantially isosceles triangular shape as a base, and a sheet extending in the front-rear direction is disposed above the shock absorber. It is pivoted on a pipe.

For this reason, the cross pipe is used for both supporting the engine with respect to the vehicle body frame and pivoting the shock absorber, and therefore, compared to the conventional case where a bracket for pivoting the shock absorber is separately provided, The structure of the motorcycle is simplified.

Moreover, since the front end of the shock absorber is pivotally supported by the cross pipe supporting the upper part of the cylinder of the engine, the engine and the shock absorber come closer to each other via the cross pipe.

Therefore, in general, since the engine and the shock absorber are heavy objects, the above-mentioned approach of the two can more surely concentrate the mass of the vehicle body, which is useful in terms of improvement in maneuverability. is there.

Further, as shown in the above "Prerequisites", the cross pipe connects the left and right frames, and is supported at both ends by these main frames, and as described above,
Since the front end of the shock absorber is pivotally supported by the cross pipe, the pivotal support of the shock absorber with respect to the vehicle body frame is strengthened.

(2) The shock absorber is disposed between the left and right main frames, and is inclined backward and downward so as to be substantially parallel to the main frames in a side view. .

That is, when the motorcycle is running, the shock absorber is pivotally supported at both ends, so that the impact force applied to the shock absorber from the cross pipe side and the rear arm side is directed in the longitudinal direction of the shock absorber. At this time, the shock absorber acts to absorb the impact force, and transfers the reaction force to the impact force to the left and right main frames of the vehicle body frame via the cross pipe shown in (1) in the longitudinal direction. Will give.

Here, as described above, since the shock absorber is substantially parallel to each of the main frames, the reaction force of the impact force applied to the shock absorber in the longitudinal direction is substantially parallel to the shock absorber. Therefore, it is suppressed that the moment is given to each of the main frames based on the reaction force from the shock absorber.

Therefore, the strength of the vehicle body frame for firmly supporting the reaction force from the shock absorber is further improved.

(3) The cross pipe, the shock absorber,
The carburetor is disposed in a space surrounded by the cylinder of the engine, and the following effects are obtained.

That is, as shown in the above "Prerequisites", the cross pipe connects the middle portions of the main frames in the front-rear direction with each other, while the engine is arranged below the left and right main frames, and The upper part of the cylinder of the engine is supported by the cross pipe. As shown in the above (1) and (2), the shock absorber has a front end pivotally supported by the cross pipe, and Since it is disposed between the left and right main frames and is substantially parallel to these main frames, excess space tends to be generated in a portion surrounded by the cross pipe, the shock absorber, and the cylinder of the engine. .

Therefore, as described above, the carburetor is disposed in a space surrounded by the cross pipe, the shock absorber, and the cylinder of the engine in a side view, and therefore, the excess space is provided by the carburetor. Each component of the motorcycle is arranged compactly by the amount effectively used for the arrangement, and the body size is reduced.

(4) The air cleaner is disposed in a space between a rear upper portion of the shock absorber and a lower portion of the seat, and the air cleaner is formed in an inverted U shape in a front view to form the air cleaner. The air cleaner is provided so as to straddle the rear portion, and one side of the air cleaner is communicated with the carburetor outside the shock absorber, and the following effects are produced.

That is, as shown in the above (2), the shock absorber has a rearwardly inclined posture, while, as shown in the "Prerequisites", a sheet extending in the front-rear direction is disposed above the shock absorber. Therefore, an excess space tends to be generated between the rear portion of the shock absorber and the seat.

Therefore, as described above, an air cleaner is disposed in the space between the rear portion of the shock absorber and the seat, and the air cleaner is formed in an inverted U shape in a front view so as to straddle the rear portion of the shock absorber. And one side of the air cleaner is communicated with the carburetor outside the shock absorber, so that the space between the shock absorber and the seat is effectively used for disposing the air cleaner. And, the left and right sides of the shock absorber were effectively used for arranging the air cleaner, and accordingly, the respective components of the motorcycle were arranged compactly, and further, The downsizing of the vehicle body is achieved.

[Brief description of the drawings]

1 shows an embodiment of the present invention. FIG. 1 is a partially enlarged partial sectional view of FIG. 2, FIG. 2 is an overall side view of a motorcycle, FIG.
FIG. 4 is a plan view, FIG. 4 is a front view, and FIG.
FIG. 6 is a sectional view taken along line VI-VI of FIG. 1 and FIG. 7 is a sectional view taken along line VII-VII of FIG. 1 ... motorcycle, 2 ... body frame, 3 ... head pipe, 4 ... main frame, 5 ... cross pipe, 7 ...
... Rear arm bracket, 11 ... Pivot shaft, 12 ... Rear arm, 19 ... Buffer, 25 ... Engine, 28 ... Cylinder, 29 ... Cylinder head, 40 ... Vaporizer, 41 ... Air cleaner, 76 …… Sheet.

Claims (1)

(57) [Claims] 1. A vehicle body frame comprising a head pipe constituting a front end thereof, and a pair of left and right main frames extending substantially linearly from the head pipe rearward and downward in a side view. The frame is formed in a box shape having a vertically long cross section, a cross pipe is provided to connect the middle portions in the front-rear direction of the main frames to each other, and the rear arm brackets are respectively extended downward from the rear ends of the main frames,
A pivot is installed on these left and right rear arm brackets,
The rear arm is pivotally supported on this pivot so that it can swing up and down,
A shock absorber whose front end is pivotally supported by the body frame and whose rear end is pivotally supported by the rear arm is provided, an engine is disposed below the left and right main frames, and a carburetor is connected to a cylinder of the engine. An air cleaner is connected to the carburetor, and the upper part of the cylinder of the engine is supported by the cross pipe, while the rear part of the engine is supported by the left and right rear arm brackets. (1) A front end of the shock absorber is connected to the cross pipe by a motorcycle formed so as to have a substantially isosceles triangular shape having a pivot shaft as a base and a seat extending in a front-rear direction above the shock absorber. (2) The shock absorber is disposed between the left and right main frames, and lowered rearward so as to be substantially parallel to the main frames in a side view. (3) The vaporizer is disposed in a space surrounded by the cross pipe, the shock absorber, and the engine cylinder in a side view. (4) The rear upper part of the shock absorber and the seat The air cleaner is disposed in a space between the lower portion of the air cleaner, and the air cleaner is formed in an inverted U-shape in a front view so as to straddle a rear portion of the shock absorber, and one side portion of the air cleaner is provided. A structure for arranging components of a motorcycle, which is connected to the carburetor outside the shock absorber.