JPH0478781A - Installation structure of motorcycle components - Google Patents

Abstract

PURPOSE:To prevent an air cleaner and a fuel tank from interfering with each other in the vertical direction by disposing the air cleaner into a space between the right and left parts of the front side of an approximate U-type fuel tank whose appearance shape in a plan view opens toward the front side. CONSTITUTION:A fuel tank 32 is an approximate U-shape whose appearance shape in a plan view opens toward the front side and an air cleaner 28 is disposed into a space 47 between the right and left sides of the front part of the fuel tank 32. Therefore, the air cleaner 28 and the front part of the fuel tank 32 do not interfere with each other vertically. It is thus possible to lower the installation position of the front fuel tank 32 regardless of the existence of the air cleaner 28, making the center of gravity lower.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an arrangement structure for an air cleaner and a fuel tank, which are components of a motorcycle.

(Prior Art) Conventionally, there is a motorcycle disclosed in Japanese Patent Application No. 63-282834.

According to this, an air cleaner and a fuel tank are arranged near the rear of the head pipe, and the front part of the fuel tank surrounds the air cleaner from left and right with its left and right sides, and covers the upper part of the air cleaner with its upper part. .

(Problems to be solved by the invention) By the way, in order to improve the maneuverability of a motorcycle,
One possibility is to lower the center of gravity by lowering the relatively heavy fuel tank.

However, in the conventional configuration described above, the front upper part of the fuel tank is located above the air cleaner, so lowering the fuel tank is not easy as it may cause problems such as compressing the capacity of the air cleaner. Additionally, since the above air cleaner is covered with a fuel tank on its left and right sides and above, when carrying out maintenance and inspection work on the air cleaner, it is first required to remove the fuel tank from the main frame side. This is not desirable because it makes the process complicated.

(Purpose of the Invention) This invention was made in view of the above-mentioned circumstances. The purpose is to make it possible to

(Structure of the Invention) A feature of the present invention for achieving the above object is that the external shape of the fuel tank in plan view is approximately U-shaped with an opening toward the front, and the front part of the fuel tank The air cleaner is located in the space between the left and right sides of the air cleaner.

(for production) The effects of the above configuration are as follows.

The front fuel tank (fuel tank) 32 has a substantially U-shaped external shape opening toward the front in a plan view, and an air cleaner 28 is disposed in a space 47 between the left and right sides of the front part of the front fuel tank 32. It is set up.

Therefore, these air cleaner 28 and front fuel tank 3
2 means that they do not interfere with each other in the vertical direction.

Therefore, regardless of the presence of the air cleaner 28, it is possible to lower the arrangement position of the front fuel cylinder 32, thereby lowering the center of gravity.

Also, above the upper 2 air cleaner 28 is the front fuel tank 3.
Since it is open without being covered by the front part of the air cleaner 28, maintenance work can be performed on the air cleaner 28 without having to perform the additional work of removing the front fuel tank 32 from the main frame 4 side. .

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 in the figures indicates an off-road motorcycle. Reference numeral 2 denotes a vehicle body frame, and the vehicle body frame 2 has a head vibrator 3 at the front thereof, and a main frame 4 extends rearward from the head vibrator 3 in plan view. Further, a rear arm bracket 5 extends downward from the rear end of the main frame 4. 6 is a down tube, and this down tube 6 connects the front end of the main frame 4 and the lower end of the rear arm bracket 5.

The main frame 4 has an upper vibe 8 and a lower pipe 9 arranged vertically in parallel, and these two vibes 8.9 are connected to each other by a pair of left and right side plates 10, 10. As a result, the cross section of the main frame 4 is shaped like a vertically long box,
It has a shape that can sufficiently withstand vertical loads during off-roading. Furthermore, since the main frame 4 is constructed of a single member, its width is made sufficiently large to withstand loads from the left and right directions.

A front fork 12 is supported on the head vibe 3 so as to be freely steerable, and a front wheel 13 is supported on the front fork 12.
, and a handle 14 are attached. On the other hand, a rear arm 16 is pivotally supported on the rear arm bracket 5 by a pivot shaft 15 so as to be vertically swingable.
A rear wheel 17 is supported at the swinging end of 6. Further, the rear arm 16 is supported by the main frame 4 via a shock absorber 18.

A four-stroke parallel two-cylinder engine 20 is supported at the lower part of the vehicle body frame 2, and a power transmission device M21 is connected to this engine 20. The rear wheel 17 is interlocked with the power transmission device 21 by a chain winding means 22, and the power of the engine 20 is transmitted to the rear wheel 17 via the power transmission device 21 and the chain winding means 22.

Each shilling 24 of the engine 20 is a crankcase 2
5, and an intake pipe 26 is connected to each rear surface thereof. Each intake pipe 26 extends upward substantially vertically, and a carburetor 27 and an air cleaner 28 are connected to each upper end thereof. In this case, the intake pipe 26,
Since the carburetor 27 and the air cleaner 28 are arranged in the vertical direction, a downdraft effect is obtained in the engine 20. Reference numeral 29 denotes an exhaust pipe, and the exhaust pipe 29 once extends forward and downward from the front surface of each cylinder 24, and then is folded back and extends to the rear of the vehicle body.

A front fuel tank 32 and a rear fuel tank 33 that supply fuel to the carburetor 27 are provided.
is supported by the vehicle body frame 2 above the engine 20. On the other hand, the rear fuel tank 33 is supported by the rear arm bracket 5 and a bracket 34 projecting from the rear arm bracket 5, and a seat 35 is attached to the rear fuel tank 33.

Also, a radiator 3 for water cooling the engine 20.
6 is provided, and this radiator 36 is attached to the front surface of the down tube 6. In addition, 37 is a cowling.

In FIGS. 2 to 4, each of the air cleaners 28 is located near the rear of the head pipe 3 and near each side of the front part of the main frame 4. Each air cleaner 28 has a cleaner case 40 that houses an element 39. The upper part of the cleaner case 40 is an opening that allows the element 39 to be inserted and removed freely, and this opening is connected to the cover 1.
; 1ii41 is closed so that it can be opened and closed freely. The front part of the cleaner case 40 has an air introduction passage 4 extending vertically.
2 is formed, and outside air is drawn in from the lower end of the air introduction passage 42 as shown by arrow Δ in FIG. 2, and into the cleaner case 40 from k and M. The above cleaner case 40
An air outlet 43 is formed in the bottom plate of the air inlet 43, and the air that has passed through the element 39 from the air introduction path 42 side passes through the air outlet 43 and enters the vaporizer 27 as shown by arrow 3 in Figure 2 above. Inhaled.

Each of the cover plates 41.degree. 41 of the left and right air cleaners 28 is integrally formed with a connecting bar 44, and the left and right center portions of the connecting bar 44 are removably screwed to the main frame 4 by screws 44a. For this reason, the screw 44
By operating a, the left and right cover plates 41, 41 can be integrally opened and closed.

The front fuel tank 32 has a substantially U-shaped external shape opening toward the front in a plan view, and has a pair of left and right tank side portions located near the rear of the head vibe 3 and near the sides of the main frame 4. 45, 45, and a tank upper part 46 which connects the rear upper parts of these tank side parts 45 and is located near the upper part of the main frame 4. The left and right air cleaners 28.28 are disposed in a space 47 between the front portions of the tank side portions 45.45.

In the above case, the front fuel tank 32 is disposed at a low position until its lower end approaches the top surface of the engine 20, thereby lowering the center of gravity and centralizing mass. Further, the cover plate 41 can be opened and closed without removing the front fuel tank 32 from the vehicle body frame 2 side, so that the element 39 can be inserted into and removed from the cleaner case 40 and the air cleaner 28 can be opened and closed. It is assumed that maintenance and inspection work can be performed easily. Further, 48 is a fuel injection port.

FIG. 5 shows another embodiment.

According to this, the front fuel tank 32 is composed of a pair of left and right divided tanks 50.50.

On the other hand, a pair of front and rear pivot means 51.51 are provided on the left and right sides of the vehicle body frame 2, respectively.
51, the lower part of the divided tank 50 is removably engaged with the segment 51, and is pivotally supported to be rotatable left and right about the engagement portion. In addition, the divided tank 50 is connected to the vehicle body frame 2.
Engagement means 52 is provided for releasably engaging the upper rotating end of the split tank 50 with the two-body frame 2 when the split tank 50 is rotated to the side. Furthermore, when each divided tank 50 is engaged in this way, these divided tanks 50.50
A buckle-type connecting means 53 is provided for connecting the two. The pivot means 51, the engagement means 52.
Each divided tank 50 can be detachably attached to the vehicle body frame 2 by the connecting means 53. Further, the injection port 48 is provided in each divided tank 50, respectively.

Other structures and functions are the same as those of the previous embodiment.

Although the above is based on the illustrated example, if the engine 20 has a small displacement or has a single cylinder, the air cleaner 28 may be provided as a single unit on one side of the main frame 4. good.

(Effects of the Invention) According to the present invention, the external shape of the fuel tank in plan view is approximately U-shaped with an opening facing forward, and the air cleaner is disposed in the space between the left and right sides of the front part of the fuel tank. Therefore, the air cleaner and fuel tank do not interfere with each other in the vertical direction.

Therefore, the location of the fuel tank can be lowered regardless of the presence of an air cleaner, resulting in a lower center of gravity.If the engine is located below this, the fuel tank can be moved closer to the engine to concentrate mass. be able to. That is, it is possible to improve maneuverability without compressing the capacity of the air cleaner.

In addition, since the upper part of the air cleaner is open without being covered by the front part of the fuel tank, maintenance work can be performed on the air cleaner without having to remove the fuel tank from the main frame. In other words, there is an advantage that the above-mentioned work on the air cleaner can be done easily.

Margin below C)

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is an overall side view of a motorcycle, Fig. 2 is a partially enlarged sectional view of Fig. 1, Fig. 3 is a plan view of what is shown in Fig. 2, and Fig. 4 is a side view of the entire motorcycle. The figure is r of the same figure 2.
FIG. 5, a sectional view taken along the line V-IV, shows another embodiment and corresponds to FIG. 3. 1. Motorcycle, 2. Body frame, 3. Head vibe, 4. Main frame, 20. Engine, 28.
・Air cleaner, 32...Front fuel tank (fuel tank), 47...Space.

Claims (1)

[Claims] 1. In a component arrangement structure for a motorcycle in which an air cleaner and a fuel tank are arranged near the rear of a head pipe that constitutes a body frame, the external shape of the fuel tank in plan view is approximately U with an opening facing forward. A component arrangement structure for a motorcycle in which an air cleaner is arranged in a space between the left and right sides of the front part of the fuel tank in the shape of a letter.