JP2765052B2 - Motorcycle motorcycle intake system - Google Patents

Description

Description: Object of the Invention (Industrial application field) The present invention relates to an intake device for a motorcycle using a rubber intake pipe that connects a carburetor and a cylinder or a crankcase.

(Prior Art) FIG. 7 shows a motorcycle equipped with a two-cycle engine.

An engine a is arranged at the center of the vehicle body, an exhaust pipe c is introduced from a front edge of the cylinder b, and an intake pipe d is introduced to a rear edge of the cylinder b.

The intake pipe d is often made of rubber to connect the rear carburetor e and attenuate intake noise. An air cleaner case f is connected to the rear of the carburetor e.

On the other hand, the rear wheel g is buffered by one cushion unit h. The cushion unit h is arranged on the vehicle body center line X, is linked to a swing arm j via a link mechanism i, and has an upper end pivotally supported by a part of a frame crossing the air cleaner case f.

Therefore, in order to avoid interference with the cushion unit h, for example, as shown in FIG. 6, the air cleaner case f has a layout in which the outlet k is bypassed to one side and connected to the carburetor e. It is deviated to one side and connected so that the intake pipe d is introduced into the cylinder b from the oblique side.

That is, the intake port is opened with its center placed on the center line X, and the center line Y of the intake pipe d is inclined at an angle θ with respect to the diameter coincident with the center line X when viewed from the cylinder axis direction. Will be taken.

The intake air-fuel mixture is naturally introduced in the direction of the center line Y, so that the introduction distribution of the cylinder b has an uneven amount. The air-fuel mixture hits the piston and cools it. In this case, there is a problem that the temperature distribution of the piston becomes uneven and leads to a thermal trouble.

(Problems to be Solved by the Invention) As described above, when the intake pipe is introduced from an oblique side as viewed from the cylinder axis direction, the temperature distribution of the piston becomes non-uniform, which causes a thermal trouble. In view of the problem described above, the present invention relates to a motorcycle that changes the structure of an intake pipe to uniformly introduce an air-fuel mixture to a piston, thereby equalizing the temperature of the piston and eliminating thermal problems. The purpose of the present invention is to provide an air intake device.

[Configuration of the invention]

(Means for Solving the Problems) In order to achieve the above object, a motorcycle intake device according to the present invention is a rubber intake pipe connecting a carburetor and a cylinder or a crankcase, the center line of which is provided. , When viewed from the cylinder axis direction, in a direction in which the inlet port is inclined to one side with respect to the diameter passing through the center of the intake port, at the outlet end of the intake pipe,
A guide wall that bisects the inside of the passage with a surface substantially corresponding to the diameter is integrally formed and provided, and a nipple communicating with the resonance volume device is opened in each of the divided passages on both sides of the guide. is there.

(Operation) With this configuration, the intake air-fuel mixture is introduced into the cylinder through two divided passages separated by the guide wall.

While the air-fuel mixture flows along the inclined passage (outside) on the obtuse angle side (outside) of the intake pipe inclination, the air-fuel mixture is deflected in the axial direction by the guide wall and flows in the acute-angled (inside) division passage.

Further, at the upstream end of the guide wall, since the cross-sectional area of the inner divided passage is larger than the cross-sectional area of the outer divided passage due to the inclination θ, more air-fuel mixture is introduced.

By the above two operations, the air-fuel mixture is uniformly introduced into the piston, and the piston cooling is made uniform by making the piston cooling operation uniform, so that the thermal trouble is eliminated.

Further, although a difference in conditions such as the flow velocity appears between the two divided passages, since the two passages communicate with each other via the resonance volume device, uniform suction is ensured.

The resonance volume device is useful for improving the suction efficiency by utilizing the intake pulsation wave as in the related art.

(Embodiment) A description will be given below with reference to the drawings showing an embodiment of the present invention.

In FIG. 1, FIG. 2, FIG. 3, FIG. 4, and FIG.
The intake pipe 1 is a rubber pipe connecting the carburetor and the cylinder 2. The inlet pipe is inserted into an outlet tube of the carburetor and fastened by a band, and the outlet side is attached to the cylinder 2 by a mounting flange 3. Reference numeral 4 denotes a reinforcing member inserted into the mounting flange 3.

A pair of the mounting flanges 3 are formed at an angle of θ set with respect to the intake pipe 1. Therefore, when mounted on the cylinder 2, the center line Ya of the intake pipe 1 is inclined at an angle θ with respect to the diameter Za passing through the center of the intake port.

Next, the outlet end of the intake passage 5 in the intake pipe 1 is divided into right and left by a guide wall 6 having a plane substantially matching the diameter Za. The guide wall 6 is integrally formed when the intake pipe 1 is formed.

In addition, nipples 7a and 7b are opened in each of the divided passages 5a and 5b thus divided, and communicate with each other through a resonance volume tube 8.

The air-fuel mixture sucked from the carburetor passes through the intake passage 5 and is once divided into divided passages 5a and 5b at the outlet end and introduced into the cylinder 2.

As shown in FIG. 3, in the divided passage 5a on the obtuse angle side (outside) with respect to the inclination angle θ, the air-fuel mixture is introduced substantially along the inclination angle θ, and is thus supplied more to one end of the piston. On the other hand, in the acute-angle side (inner side) divided passage 5b, the light is deflected by the guide wall 6 in the direction of the diameter Za and introduced.

At the upstream end of the guide wall 6, as shown in FIG. 2, the sectional area of the inner divided passage 5b is reduced due to the angle θ.
, And more air-fuel mixture flows into the inner divided passage 5b and is introduced in a diametrically deflected manner as described above.

In this way, the left and right air-fuel mixture is supplied to the piston as a whole, so that the temperature distribution of the piston is made uniform by its cooling action, and the thermal trouble caused by the non-uniform temperature distribution is eliminated.

Further, since the inner and outer divided passages 5a and 5b are communicated with each other by the resonance volume pipe 8, the intake pulsation wave is used to improve the intake efficiency and to correct the difference in flow velocity between the two divided passages 5a and 5b. To prevent turbulence of intake air due to the divided passage.

〔The invention's effect〕

As described above, the intake device for a motorcycle according to the present invention is a rubber intake pipe that connects a carburetor and a cylinder or a crankcase, and the center line of which is viewed from the cylinder axis direction, is the intake port of the intake port. A guide wall which is inclined to one side with respect to a diameter passing through the center and has a guide wall which is integrally formed at an outlet end of the intake pipe with a surface substantially corresponding to the diameter and bisects the inside of the passage. A nipple leading to the resonance volume device is opened in each of the divided passages on both sides of the guide, and a very simple structure made by integrally molding a rubber intake pipe, without lowering the intake efficiency, This has the effect of eliminating thermal problems of the piston caused by the inclination of the piston.

[Brief description of the drawings]

1 is a plan view of an intake pipe according to an embodiment of the present invention, FIG. 2 is a vertical sectional view of the intake pipe taken along line AA of FIG. 1, and FIG. 3 is a cross-sectional plan view of the intake pipe of FIG. Fig. 4 is a front view of the intake pipe in Fig. 1, Fig. 5 is a vertical sectional side view of the intake pipe in Fig. 1, Fig. 6 is a plan view showing the arrangement of the intake system, and Fig. 7 is the intake air in Fig. 6. It is a side view of the motorcycle provided with the system. 1 ... intake pipe, 2 ... cylinder, 3 ... mounting flange, 5 ... intake passage, 5a, 5b ... split passage, 6 ...
… Guide walls, 7a, 7b… Nipple, 8… Resonance volume tube.

Claims (1)

(57) [Claims] 1. A rubber intake pipe for connecting a carburetor and a cylinder or a crankcase, the center line of which is inclined to one side with respect to the diameter passing through the center of the intake port when viewed from the cylinder axis direction. In the one taking the introduction direction, at the outlet end of this intake pipe,
A guide wall which bisects the inside of the passage with a surface substantially corresponding to the diameter is integrally formed and provided, and a nipple communicating with the resonance volume device is opened in each of the divided passages on both sides of the guide. An intake device for motorcycles.