JPH062875Y2 - Intake device for vehicle having pipe frame - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an intake device for a vehicle such as a motorcycle or an all-terrain vehicle having a frame made of pipe material.

(Prior Art) Generally, an intake device of a motorcycle or the like has an air cleaner case arranged between an upper part of an engine and a lower part of a seat, and air purified by the air cleaner case is sent to a carburetor or the like through a connecting tube. The fuel is vaporized and supplied into the cylinder of the engine.

When the air cleaner case is arranged above the engine in this way, the air introduced into the air cleaner case is warmed by the heat of the engine, the air density is reduced, and it is disadvantageous in improving the engine output. Also, the capacity of the fuel tank must be reduced.

Therefore, as disclosed in Japanese Patent Laid-Open No. 59-49360, there is proposed an intake device in which an air cleaner case is arranged behind a front and rear V-type engine.

(Problems to be solved by the invention) By arranging the air cleaner case behind the rear cylinder of the front and rear V-type engine, the capacity of the fuel tank can be increased and the output of the engine can be improved. However, since the intake duct that connects the air cleaner case and the carburetor or the intake port of the engine must be provided separately, and the intake duct must be installed avoiding the rear cylinder of the engine, the length of this intake duct is become longer.

(Means for Solving Problems) In order to solve the above problems, the present invention provides a fuel tank and a seat behind a head pipe, and mounts a front and rear V-type engine below the fuel tank. An air cleaner is arranged below the seat behind the engine, and a pair of left and right main tubes are extended from the head pipe to above the engine. The main pipe, which extends below the seat, is joined to the pair of left and right center tubes, and is arranged between the front cylinder block and the rear cylinder block of the engine and the main pipe. The front end of the main pipe is connected with a connecting tube, and the air cleaner is connected to the rear end of the main pipe. An intake device for a vehicle having a ram was constructed.

(Function) The air cleaner placed behind the engine has a smaller effect of heat on the engine compared to the case where it is placed above the engine, so the temperature rise of the intake air is suppressed, and the connecting pipe between the air cleaner and the carburetor device is The main pipe of the vehicle body frame was used without circumscribing the side of the cylinder block, which suppressed the increase in the number of piping parts and the dimension in the vehicle width direction for the piping space, and also provided a straight line on the vehicle body center line. It is possible to configure a different intake system.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a side view of a frame of a motorcycle to which an intake device according to the present invention is applied, FIG. 2 is a plan view of the frame, and FIG.
The figure is a rear view of the same frame.The head pipe (1) is welded to the front end of the main frame (2) that extends rearward, and the upper end of the down frame (3) that extends rearward and downward. The frame (2) is composed of a front part consisting of a pair of left and right main tubes (2a), (2a) that straddles the fuel tank (8) and a large-diameter main pipe (2b).
The front ends of a) and (2a) are welded to the head pipe (1) as described above, the middle part is widened in the vehicle width direction, and the rear end is welded to the front part of the main pipe (2b). The upper ends of a pair of left and right center tubes (4a), (4a) forming the center frame (4) are welded to the rear portion of the main pipe (2b) inclined downward.

Further, the pair of left and right down tubes (3a), (3a) forming the down frame (3) are bent in the middle portion and extend rearward in a substantially horizontal direction, and the rear ends of these down tubes (3a), (3a). The portion is connected to a pivot plate (5) that swingably supports the front end portion of the rear fork, and the center plates (4a), (4a) and the rear frame (6) extending upward are attached to the pivot plate (5). Pair of left and right rear tubes (6a), (6
The lower end of (a) is bonded, and the upper ends of the rear tubes (6a), (6a) are connected to the middle part of the pair of left and right seat rail tubes (7a), (7a) that form the seat rail (7). The front ends of the seat rail tubes (7a) and (7a) are
Welded to the upper end of (a), (4a) and seat rail tube (7
A seat (9) whose front end extends to above the main pipe (2b) is placed on a) and (7a).

By configuring the frame as described above, the main frame (2), the down frame (3) and the center frame (4)
Thus, a frame having a side loop shape is configured, and the engine (10) is mounted and supported in the loop frame via a bracket. This engine (10) has a pair of front and rear V-shaped cylinder blocks (10a), (10a), and a carburetor device (11) is arranged in a V bank between these cylinder blocks (10a), (10a). Has been done. This carburetor device (11) is composed of a pair of carburetors (11a), (11a) corresponding to each cylinder block (10a), (10a), and the air supply to these carburetors (11a), (11a) is performed by the main pipe ( 2b).

That is, the center tube (4a), (4a), the rear tube (6a),
An air cleaner case (12) is arranged in the space surrounded by (6a) and seat rail tubes (7a), (7a), and the outlet of this air cleaner case (12) and the rear end opening of the main pipe (2b) are Is connected with the tube (13), and the front end opening of the main pipe (2b) and the carburetor (11a), (11a) are connected with the branch pipes (14a), (14a) of the connecting tube (14). . Thus, the air purified in the air cleaner case (12) passes through the main pipe (2b) and the branch pipes (14a), (14a) of the connecting tube (14) to the carburetor (11a), (11a).
The fuel is vaporized inside and supplied to each cylinder block (10a), (10a).

In addition, although the example applied to the motorcycle has been shown in the embodiment, the present invention is not limited to this, and the present invention can be applied to any vehicle using a pipe material as a frame. The one main pipe (2b) is used as a part of the intake duct, but other frame parts may be used as the intake duct depending on the frame structure of the vehicle. Further, the air from the air cleaner case may be directly supplied to the intake port of the engine through the main pipe.

(Effects of the Invention) As described above, according to the present invention, the air cleaner case is arranged at the rear of the engine, so that the intake air is not excessively warmed by the heat of the engine and the density is not reduced, so that the engine output is improved. Further, even if the air cleaner case is arranged at the rear of the engine, a part of the pipe material constituting the frame is used as an intake duct, which is advantageous in terms of the number of parts and space. Further, the intake system according to the present invention can improve the engine output by reducing the intake loss due to the linear configuration of the intake system, and can improve the occupant's sitting posture by slimming the dimension in the vehicle width direction. It also has an effect.

[Brief description of drawings]

FIG. 1 is a side view of a frame of a motorcycle to which an intake device according to the present invention is applied, FIG. 2 is a plan view of the frame, and FIG.
The figure is a rear view of the frame. In the drawing, (1) is the head pipe, (2) is the main frame, and (2
(a) is main tube, (2b) is main pipe, (8) is fuel tank, (9) is seat, (10) is engine, (11) is carburetor, (12) is air cleaner case, (14) is connecting It is a tube.

Claims (1)

[Scope of utility model registration request] 1. A fuel tank and a seat are arranged behind a head pipe, a front and rear V-type engine is mounted below the fuel tank, and an air cleaner is arranged below the seat behind the engine. A pair of left and right main tubes extend from the pipe to above the engine, and their rear ends are joined to one large-diameter main pipe above the rear cylinder block of the engine, and the main pipe extends to below the seat. Extending, connecting with a pair of left and right center tubes, connecting the carburetor device arranged between the front cylinder block and the rear cylinder block of the engine and the front end of the main pipe with a connecting tube, An intake device for a vehicle having a pipe frame having the air cleaner connected to an end thereof.