JPS5910377Y2 - Engine fuel evaporative gas recovery device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a fuel evaporative gas recovery device for an engine such as a motorcycle.

The fuel gasoline used in the engines of automobiles, motorcycles, etc. is highly volatile and contains harmful substances in the evaporated gas.

There is a fuel tank air breather that is connected to a canister chamber containing activated carbon to absorb harmful substances and prevent them from escaping to the outside.

However, when refueling at a gas station, evaporated gas emanates from the gap between the refueling gun that is inserted into the filler port.

When attempting to collect this evaporated gas into the canister chamber, a large amount is generated at once, and the gas becomes saturated and cannot be absorbed.

You can consider making the canister room larger, but this is fine if there is plenty of room in the engine room, such as in a car.
In the case of motorcycles, there is no space to accommodate a large canister chamber.

This invention has been improved in view of these points, and an embodiment of the invention shown in the drawings will be described below.

An injection port 2 protruding from the upper surface of the fuel tank 1 is always covered with a cap 3.

A valve body 4 is provided near the injection port 2.

The valve body 4 is cylindrical and rotatable, and the two inlets 5 and 6 are switched and communicated by rotation.An arm piece 7 is attached to one side, and a spring 8 is attached to the valve body 4. The arm piece 7 is urged upward so that the tip of the arm piece 7 faces the inside of the injection port 2.

The first position 5 is active when the arm piece 7 is in the upper position, and the second position 6 is active when the arm piece 7 is lowered.

The first port 5 is connected to a first canister chamber 10 via a separation chamber 9 by a pipe, and the second inlet 6 is connected to a second canister chamber 11 by a pipe.

Further, the first canister chamber 10 and the second canister chamber 11 are each connected to an intake pipe 14 of an engine 13 by a suction pipe 12, and an opening 15 is provided at the other end.

16 is a carburetor, and 17 is an air cleaner.

A seal plate 19 is provided on the refueling gasoline 18 to elastically contact the mouth of the injection port 2 to close it.

The effect will be explained.

Normally, the arm piece 7 is pushed upward by a spring 8, and the first port 5 communicates with it, and the evaporated gas is absorbed into the first canister chamber 10.

When the refueling gun 18 is inserted into the injection port 2 for refueling, the injection port 2 is closed with a seal plate 19.

Then, as the arm piece 7 is pushed down with the tip of the refueling gun 18,
The first population 5 is closed and the second population 6 is open.

Evaporated gas during refueling is absorbed into the second canister chamber 11.

Harmful substances adsorbed in the first canister chamber 10 and the second canister chamber 11 are removed from the intake pipe 14 while the engine 13 is running.
suction through the suction pipe 12 with a negative pressure of
Burn it with.

As explained above, this idea provides a valve body near the fuel tank inlet that rotates to switch between the two inlets.
The arm piece of the valve body is biased by a spring to protrude inside the injection port,
Normally, the first inlet is connected to the first canister chamber, and when the arm is pressed with the refueling gun, the second inlet is connected to the second canister chamber. A harmful portion of the evaporated gas in the tank can be adsorbed into the second canister chamber only during refueling.

In other words, with a method where the first canister is made larger and there is no second canister, if you refuel the car immediately after it has been left outdoors for a long time, the canister becomes saturated and cannot absorb the evaporated matter when refueling. However, the present invention eliminates the above drawback by providing two canister chambers.

Furthermore, by making both canister chambers sized to match the respective amounts of evaporative gas, the size of the canister chambers can be reduced and the canister chambers can be mounted at appropriate positions on the vehicle body.

Furthermore, the evaporated gas adsorbed in the second canister chamber can be purged from the time of refueling to the time of the next refueling.
It is possible to prevent the air-fuel ratio from being greatly influenced through the control valve or the like.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a side view, FIG. 2 is an enlarged vertical sectional view of the main part, and FIG. 3 is a cross-sectional view of the same. 1...Fuel tank, 2...Inlet, 4...Valve body,
5...First population, 6...Second entrance, 7...Arm piece,
8... Spring, 10... First canister chamber, 11...
・Second canister room, 18...Refueling gun.

Claims (1)

[Scope of utility model registration request] A valve body that switches between two inlets by rotation is installed near the fuel tank's inlet, and the arms of the valve body are biased by springs to protrude inside the inlet. 1. A fuel evaporative gas recovery device for an engine, characterized in that the fuel evaporative gas recovery device for an engine is connected to a canister chamber, and when an arm piece is pressed with a refueling gun, a second inlet is communicated to the second canister chamber.