JPH0437267B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in an air intake device for a motorcycle or the like.

(Prior Art and Problems to be Solved by the Invention) The intake system of a motorcycle consists of an air cleaner that takes in outside air and purifies it, and a connecting pipe that connects the clean side of the air cleaner and the fuel supply system of the engine. (For example, Japanese Utility Model Application Publication No. 55-76468, Japanese Patent Application Publication No. 56-106051) Since the connecting pipe is usually a pipe body, there is a desire to increase the capacity if possible.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a fuel supply device for an engine disposed between front and rear wheels, which is disposed above the engine, and an air cleaner provided below the seat. The fuel supply device is connected by a removable chamber between a pair of left and right main frames that extend rearward from the head pipe,
The chamber is arranged in a position overlapping with the main frame when viewed from the side, and the chamber is formed into an arc shape that bulges upward, and the left and right width is gradually increased as it goes forward when viewed from above, and the front part of the chamber is formed to overlap the main frame. It is characterized in that it is connected to a plurality of intake ports formed in the left and right direction of the supply device, and a fuel tank is arranged above the chamber.

(Embodiment) Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is a side view of a motorcycle.
A front fork 4 supporting a front wheel 5 is supported in a head tube 3 at the front end of the frame 2 in a freely steerable manner, and a fuel tank 6 is mounted on the upper front part of the frame and an engine 7 is mounted on the lower part. A rear fork 8 pivots and extends rearward from the end, supports a rear wheel 9, and a seat 10 is provided behind the fuel tank.

The engine 7 is a lateral V-shaped multi-cylinder type engine with a horizontal crankshaft, and a carburetor 11 serving as a fuel supply device is disposed above the front and rear cylinders 7a and 7b.

The frame 2 consists of two main pipes 2a, 2a extending rearward from the upper part of the head tube 3, two down tubes 2b, 2b hanging backward and downward from the lower part of the head tube 3, and a down tube extending rearward from the lower ends of these pipes. Chew blower 2c, 2c,
The main pipe 2 is installed upward from the rear end of this pipe.
Center pipe 2 of the book connected to the rear end of a, 2a
d, 2d, upper pipes 2e, 2e forming two seat rails extending rearward from the main pipes 2a, 2a, diagonal subtubes 2f, 2f connecting the lower part of the center pipes 2d, 2d and the middle part of the upper pipes 2e, 2e, etc. Consisting of

Between the front parts of the Atsupa pipes 2a and 2a, the center pipe 2d, the Atsupa pipe 2e, and the sub tube 2f.
The air cleaner 12 is installed in the side triangular space surrounded by
As shown in the figure, one side wall 13a of the air cleaner case 13 is provided with an upwardly-opening suction portion 13b for taking in outside air so as to bulge outward, and the other side wall 13c opposite thereto is provided with an opening 13d. This is covered with a cover 14, and a cylindrical element 15 is provided inside the cover 14, and the element can be replaced by removing the cover 14. The front part of the case 13 is provided with a tubular lead-out part 13e that protrudes forward, and a frame trap 16 formed of a wire mesh is attached to the clean side outside the element at the base of this lead-out part 13e.
At the tip of the lead-out portion 13e, there is a rear end 17 of a chamber 17 having an enlarged shape and having a length from front to back forming a communicating tube.
Fit and connect a, and put a seal 1 around the connecting part.
Hold and seal with 8.

The external appearance of the chamber 17 is as shown in FIGS. 5 and 6, and is long in the front-rear direction and forms an arc that expands upward. In plan view, the left and right width increases as you go forward, and the composite Formed by resin blow molding. The bottom of the front part 17b is provided with connecting ports 17c and 17d on the left and right sides that connect to the intake port of the carburetor, and in the embodiment, there are two connecting ports because the front and rear cylinders are provided. They are formed symmetrically facing inward and spaced apart from side to side. The chamber 17 described above ensures a sufficient volume between the downstream side of the air cleaner 12 and the carburetor 11.

A guide pipe 19 that communicates with the rear end of the chamber 17 is installed inside the lead-out portion 13e of the air cleaner case 13. The rear end portion 19b is bent toward the side wall 13c, for example, and the rear end 19c is formed in the opening 1 so as to face the side wall 13c apart from the rear end portion 19b.
9d, the frame trap 16 and the opening 19 form a substantially right angle, and the rear end 19c and the frame trap 16
Separate from.

The chamber 17 described above is provided below the fuel tank 6 between the left and right main pipes 2a and at a position overlapping the main pipe 2a in plan view, as shown in FIG. 20 is an air cleaner case mounting bracket, 21 is a fender, and 22 is a battery.

Next, the operation and effect will be explained in detail. Air taken in from the suction part 13b is purified through the element 15, and is supplied to the chamber 17 with a capacity through the guide pipe 19, and then to the vaporizer 11.
Therefore, even if the accelerator is suddenly opened, the air volume on the clean side that meets the air requirement of the engine is secured, so that air is immediately supplied to the carburetor 11, and the engine 7's performance in response to the accelerator opening is Responsiveness can be improved.

In addition to the above, the provision of the guide pipe 19 also has the effect of reducing intake noise.

(Effects of the Invention) As described above, according to the present invention, the width of the chamber is gradually widened as it goes forward in plan view, so the front part of the chamber has a sufficient width, and As a result, the front part of the chamber can be easily connected to a plurality of intake ports, and the capacity of the chamber can also be increased, so that the responsiveness of the engine to opening and closing of the accelerator can be improved. In addition, the chamber that connects the air cleaner and fuel supply device is removable, so when the large capacity chamber is removed,
The upper part of the fuel supply device (carburetor) is open, making maintenance easier. or,
Since the chamber is placed between the pair of left and right main frames that extend rearward from the head pipe and at a position where it overlaps the main frame when viewed from the side, this space, which was rarely used in the past, can be used effectively. Utility can be improved, and the chamber can be protected by the left and right main frames. Furthermore, since the air cleaner is disposed below the seat in a location where there is relatively sufficient space in the case of motorcycles, the capacity of the air cleaner can be sufficiently secured.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of the motorcycle, Fig. 2 is an explanatory plan view thereof, Fig. 3 is an explanatory perspective view of the intake system, Fig. 4 is a sectional view taken along the line 4-4 in Fig. 3, and Fig. 5 6 is a front view of the connecting pipe, and FIG. 6 is a side view of the same. In the drawing, 7 is an engine, and 1 is a fuel supply device.
12 is an air cleaner, 15 is an element, 17 is a chamber, 19 is a guide tube, and 19d is an opening.

Claims (1)

[Claims] 1. A fuel supply device for an engine disposed between the front and rear wheels is disposed above the engine, an air cleaner provided below the seat and the fuel supply device are connected by a removable chamber, and the chamber is connected to a head pipe. The chamber is arranged between a pair of left and right main frames extending rearward from the main frame and at a position overlapping the main frames in side view, and the chamber is formed in an arc shape that bulges upward and gradually increases as it goes forward in plan view. A motorcycle or the like characterized in that the chamber has a large width in the left and right directions, the front part of the chamber is connected to a plurality of intake ports formed in the left and right direction of the fuel supply device, and a fuel tank is arranged above the chamber. Intake device.