JPH0419074B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motorcycle or a tricycle.

In a motorcycle, as a rear wheel suspension system, the front end of the rear fork is rotatably attached to the lower end of the frame, the rear wheel is attached to the rear end of the rear fork, and the upper end of the frame and the front end of the rear fork are attached to the rear fork. A reaction is interposed between the link mechanism and the link mechanism, and is positioned on the center line of the vehicle body, and the upward swing of the rear fork caused by the swing of the rear wheel is transmitted to the reaction via the link mechanism. What exists is known. According to this type of suspension system, the damping force for the upward stroke of the rear wheel exhibits a progressive characteristic that increases along a curved line, and the rocking of the rear wheel is damped and absorbed in a nearly ideal state.

On the other hand, among motorcycles, not only those with multi-cylinder engines, but also those with single-cylinder engines are equipped with multiple independent carburetors for the purpose of obtaining high output. . Air is sent to these plurality of carburetors via contubes from an air cleaner disposed behind them, for example, between the frames on both rear sides. It is preferable that these parts constituting the intake system be arranged on the center line of the vehicle body since the engine is arranged on the center line of the vehicle body.

By the way, when using a previous suspension system as a rear wheel suspension system in a motorcycle having a plurality of carburetors and an air cleaner between both rear frames, both the parts constituting the intake system and the reaction must be Since the carburetor and air cleaner are located on the center line of the vehicle body, and moreover, before and after the reaction, a problem arises in that the intake system and the reaction interfere with each other.

The present invention has been made in view of the above circumstances, and allows the intake system and the reaction system to be arranged compactly without impairing their original functions. The purpose is to provide a motorcycle or three-wheeled vehicle that can be installed with a narrow width, and its characteristics are as follows.
A plurality of air suction passages are disposed so as to pass on both sides of the reactor, and furthermore, are disposed so as to pass between both center pipes.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a diagram showing the overall configuration of an off-road motorcycle to which the present invention is applied.

In the figure, reference numeral 1 denotes a vehicle body frame, which is composed of a front frame 2 and a rear frame 3.
The front frame 2 is composed of a head tube 4, a main frame 5, a pair of left and right center pipes 6 extending downward from the middle of the main frame 5, a down tube 7, and an under pipe 8, while the rear frame 3 is composed of a back frame 9 and an under pipe 8. It consists of a back stay 10 extending diagonally rearward and upward from the lower end of the center pipe 6.

Rear fork 11 is behind the center pipe 6
is mounted so that it can rotate vertically. Further, a bracket 12 is attached to the connecting portion between the under pipe 8 and the center pipe 6, and a link mechanism 13 is attached between the bracket 12 and a cross member (not shown) connected to the rear fork 11. There is. Further, the lower end of one reaction 14 is rotatably attached to the link mechanism 13, and the upper end of the reaction 14 is rotatably attached to the rear end of the main frame 5. That is, the reaction 14 is arranged approximately on the center line l of the vehicle body frame 1 as shown in FIG. It is becoming absorbed. Thus, the rear fork 11, the link mechanism 13, and the reaction 14 constitute a rear wheel suspension system.

Below the seat S and above the exhaust member H,
An air cleaner case 15 and a plurality of air suction passages extending forward from the air cleaner case 15 and communicating with the carburetor 30 are located in the upper part of the vehicle body frame space K, which is formed by the center pipe 6 and the backstay 10 and is shaped like an inverted triangle when viewed from the side. 29 are provided.

In other words, the center pipe 6 and the backstay 1
As shown in FIG.
Brackets 16, 17, 1 so that they are located above
8 and is screwed to the vehicle body frame 1 via mounting members such as bolts. Further, an opening 19 is formed in the upper part of the air cleaner case 15, and an inlet tube 20 is formed in this opening 19.
is stuck. The inside of the air cleaner case 15 is connected via an inlet tube 20 to an air supply front chamber (not shown) which is communicated with the outside air.

Further, as shown in FIG. 2, an air outlet 21 is formed on the front surface of the air cleaner case 15. Inside the air outlet 21, an air cleaner element holder 22 and an air cleaner element 23 are formed. An air cleaner element unit 24 is provided. In addition,
25 is a drain.

Further, the air outlet 21 of the air cleaner case 15 is provided with a contube 2 made of a flexible material.
6 is connected. Contube 26 is the third
As shown in the figure, it consists of an air introduction section 28 having only one opening 27, and two branch sections (air suction passages) 29, 29 branching off from this air introduction section 28. The air introduction part 28 is connected to the air outlet 21, and the branch parts 29, 29
is curved toward the center of the vehicle body so that it passes on both sides of the reaction 14 with the reaction 14 in between, and then passes between the two center pipes 6. Carburetors 30, 30 on both sides of the center line
It is connected to the. Note that each carburetor 30, 30 is connected to the suction side of the engine 31, respectively. Further, the center pipe 6 is arranged on both outer sides of the contube 26.

According to the motorcycle configured as described above, since the branch parts 29, 29 of the contube 26 are arranged so as to pass through both sides of the branch parts 29, 29 with the reaction 14 disposed therebetween, the reaction 14 and The contubes 26 are both located on the center line of the vehicle body frame 1, and their original function is to buffer and absorb the vertical swing of the rear wheel in the case of the reaction 14, and to buffer and absorb the vertical swing of the rear wheel in the case of the reaction 14; By evenly guiding the air in the air cleaner to both the carburetors 30, 30, the function of the air cleaner can be sufficiently performed, and it can be arranged very compactly.

In addition, in this embodiment, contube 2
The center pipe 6 is placed on both sides of the 6.
This protects the contube 26 and the reaction 14. In addition, the air cleaner case 15 and the contube 26 are connected through a single relatively large opening 27, and as a result, when the air inside the air cleaner case 15 flows to the contube 26, the air flows through the contube 26 with less resistance. The air flow is smooth, and the air cleaner case 15 of the Contube 26
Connection work becomes very easy. Further, since the contube 26 is curved toward the center of the vehicle body so as to pass between the two center pipes 6, the contube 26 can be freely disposed between the frames without narrowing the inner diameter. As a result, the degree of freedom in installing the air cleaner is increased, a stable intake amount is obtained, and the center pipe 6 can be arranged with a narrower left and right width.
It is also possible to narrow the vehicle body width.

In addition, in the above embodiment, contube 2
Although the six air introduction sections 28 are integrated into only one, the present invention is not limited to this, and a plurality of air introduction sections 28 may be provided according to the number of vaporizers 30. However, in view of the flow of air within the tube 26 and the trouble of attaching it to the air cleaner case 15, it is preferable to integrate it into one.

Further, in the above embodiment, the vaporizer 30 has two
However, it goes without saying that the present invention is applicable even if there are three or more. Also,
The present invention is not limited to motorcycles, but can also be applied to tricycles.

As explained above, according to the motorcycle or tricycle according to the present invention, (a) an air cleaner and an air suction passage are provided in the upper part of the body frame space which is formed by the center pipe and the backstay and has an inverted triangular shape when viewed from the side; Since this part is a large space, a relatively large air cleaner and a large diameter air intake passage can be installed without interfering with the vehicle body frame.
(b) Since the air suction passage is curved toward the center of the vehicle body so as to pass between both center pipes, the air suction passage can be freely arranged between the vehicle body frames without narrowing the inner diameter; , (c) Since the intake system such as an air cleaner is placed above the exhaust member, and these intake systems are not affected by the heat of the exhaust member, they work together to
To supply a sufficient amount of air to a vaporizer in a form with low suction resistance and without being heated. As a result, the output of the engine can be improved.

In addition, the body frame such as the center pipe does not interfere with the intake system, so you can freely set the width to be narrower and reduce the body width.Also, the rear suspension does not interfere with the intake system, so its function will not be impaired in any way. . In this way, excellent effects such as being able to arrange the entire equipment compactly without interfering with each other are achieved.

[Brief explanation of drawings]

Figures 1 to 3 each show an embodiment of the present invention. Figure 1 is a side view showing the whole, Figure 2 is an enlarged side view of the main parts, and Figure 3 is an engine and a carburetor. , a contube, and an air cleaner case for explaining the arrangement of the air cleaner case. 1...Vehicle frame, 2...Front frame, 3
...Rear frame, 5...Main frame, 6...
...Center pipe, 13...Link mechanism, 14...
...Reaction, 15...Air cleaner case, 22...Air cleaner element holder, 23...Air cleaner element, 24
...Air cleaner element unit, 26
...Contube, 28...Air introduction part, 29...
... Branch (air suction passage), 30 ... Carburizer, S
...Seat, H...Exhaust member, K...Vehicle frame space.

Claims (1)

[Claims] 1. A plurality of carburetors from the front to the rear of the vehicle body,
A reactor and an air cleaner are sequentially arranged, and a pair of left and right center pipes, the upper part of which is connected to the main frame and the lower part of which supports a rear fork, are installed in the middle of a single main frame that supports the upper part of the reactor. The vehicle body frame space is located below the seat and above the exhaust member, and is an inverted triangular space when viewed from the side formed by the center pipe and a back stay extending diagonally rearward and upward from the lower end of the center pipe. A plurality of air suction passages extending forward from the air cleaner and communicating with the carburetor are provided in the upper part, and the plurality of air suction passages are made of a flexible material, and the plurality of air suction passages are formed from a flexible material and extend forward from the air cleaner. A motorcycle characterized in that the motorcycle is arranged so as to be curved toward the center of the vehicle body so that when extending to the center pipe, the reaction tube is disposed between the reaction tubes, the reaction tube is disposed between the reaction tubes, and the reaction tubes are disposed between the reaction tubes and the reaction tubes are disposed between the reaction tubes. Or an auto tricycle.