JP2571882Y2 - Intake induction device for motorcycle engine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a device for introducing air into a motorcycle engine.

[0002]

2. Description of the Related Art In a motorcycle engine, a filter in an air cleaner box is used to remove dust to create a clean intake air, which is then mixed with a fuel by a carburetor to form an intake gas. I try to inhale.
Since the air cleaner box has a limited capacity,
In particular, when the rotation speed is high and the amount of intake air is large, the inside of the air cleaner box has a negative pressure of about 300 mm of mercury, so that the amount of intake air becomes insufficient and the output decreases. Therefore, the air guide pipe connected to the air guide port provided on the entire cowling is connected to the air cleaner box, and the wind received during traveling is introduced into the air cleaner box through the air guide pipe to reduce the negative pressure.

[0003]

When the wind received during traveling is introduced into the air cleaner box by the air guide tube, the amount of dust suction increases. In addition, particularly in rainy weather, rainwater enters the air guide tube, which causes inconvenience such as wetting the filter in the air cleaner box.

[0004] In view of such a point, this invention introduces the wind received by traveling into an air cleaner box through a baffle tube to reduce the negative pressure in the air cleaner box, and draws rainwater and dust into the air cleaner box. It is an object of the present invention to obtain an intake air introduction device for a motorcycle engine that can reduce the amount of exhaust gas.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, a motorcycle engine intake introduction device of the present invention covers a front side of a vehicle body with a cowling, and arranges a pair of left and right air guide ports on a front surface of the cowling. On the other hand, a pair of left and right air intake ports are disposed at the lower front of an air cleaner box having a filter for supplying clean air to the engine, and the pair of left and right air guide ports and a pair of air intake ports corresponding thereto are arranged. The pair of left and right air guide tubes are connected to each other, and the pair of left and right air guide tubes is separated from the air guide box by a space between the lower part of the carburetor and the upper part of the engine case. A drain for draining water flowing into the connection chamber is provided substantially at the center in the left-right direction of the lower wall of the connection chamber, and connected to each other by a connection chamber whose lower wall is inflated toward the side. Towards the type on the ground surface side in which it is disposed.

[0006]

The air received during traveling is introduced into the air cleaner box from the left and right air guide tubes and pressurized, so that the negative pressure during high rotation can be almost eliminated. Then, rainwater and dust flowing into the wind guide pipe from the wind guide port of the cowling flow into the low connection chamber, flow down to the drain pipe, and flow out. In this way, it is possible to prevent rainwater from flowing into the air cleaner box, and to reduce contamination of the filter in the air cleaner box. Further, since the connecting chamber is disposed by effectively utilizing the space formed between the upper part of the engine case and the carburetor, the size of the vehicle body does not increase.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the engine 1, fuel is mixed in a carburetor 3 into intake air that has been cleaned by removing dust with a filter in an air cleaner box 2, and the resulting intake air is sucked. The rear end of the air guide tube 4 is connected to the lower left and right sides of the front side of the air cleaner box 2. The left and right air guide pipes 4 extend forward through the sides of the engine 1 and have front ends connected to the air guide ports 6 opened to the front left and right sides of the cowling 5.

[0008] A pair of left and right air guide tubes 4 are provided in front of the air cleaner box 2 in a connection chamber 7 provided by utilizing a space interposed between the carburetor 3 and the upper part of the engine case. connect. Therefore, the installation of the connection chamber does not increase the size of the vehicle body. The connecting chamber 7 has its lower wall 7a inflated toward the ground surface side from the air guide tube 4, and a drain pipe 8 is provided substantially at the center of the lower wall portion 7a in the left-right direction. Arranged for

The air received during traveling flows from the left and right air guide tubes 4 into the air cleaner box 2 and is pressurized, so that the negative pressure in the air cleaner box 2 can be reduced and the engine output increases. Can be achieved. Rainwater and dust easily enter the wind guide opening 6 opened on the front surface of the cowling 5 during traveling. However, rainwater and dust flow backward on the lower surfaces of the left and right air guide tubes 4 and flow into the lowered connection chamber 7. Then, the water flows out from the drain pipe 8. For this reason, it is possible to prevent rainwater from flowing into the air cleaner box 2, and it is possible to reduce dirt on the filter in the air cleaner box 2.

[0010]

[Effects of the Invention] As described above, the present invention is constructed as described above, so that the air received during traveling from the left and right air guide pipes is introduced into the air cleaner box and pressurized, and the air is then introduced into the air cleaner box. The generated negative pressure can be reduced, and the engine output can be increased. In addition, rainwater and dust flowing into the air guide pipe from the wind guide port of the cowling enter the lower connection room and flow out of the drain pipe. For this reason, it is possible to prevent rainwater from entering the air cleaner box, and it is possible to reduce dirt on the filter in the air cleaner box. In addition, since the connecting chamber is disposed by effectively utilizing the space formed between the upper part of the engine case and the carburetor, the design of the connecting chamber is easy without increasing the size of the vehicle body.

[Brief description of the drawings]

FIG. 1 is a side view of a main part showing an embodiment of the present invention.

FIG. 2 is a plan view of a main part showing the embodiment of the present invention.

FIG. 3 is a cross-sectional view of the connecting chamber portion showing the embodiment of the present invention.

FIG. 4 is an overall side view showing an embodiment of the present invention.

FIG. 5 is an overall plan view showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine 2 Air cleaner box 4 Wind guide tube 5 Cowling 6 Wind guide port 7 Connecting room 8 Drain pipe

Claims (1)

(57) [Scope of request for utility model registration] 1. A front side of a vehicle body is covered with a cowling (5), and a pair of left and right air guide ports (6) are disposed on a front surface of the cowling (5), while a filter for supplying clean air to the engine (1) is built in. A pair of left and right air intake ports is provided at the lower part of the front of the air cleaner box (2), and the pair of left and right air guide ports (6) and a pair of corresponding air intake ports are respectively paired with left and right air guide tubes. (4) and connect the pair of left and right air guide tubes (4) in the space between the front of the air cleaner box (2) and the lower part of the carburetor (3) and the upper part of the engine case. A connecting chamber (7) in which the lower wall (7a) is inflated toward the ground surface side from the wind pipe (4).
Further, a drain pipe (8) for discharging water flowing into the connection chamber (7) is provided substantially at the center in the left-right direction of the lower wall (7a) of the connection chamber (7). An intake introduction device for a motorcycle engine, wherein the intake device is disposed toward the side.