Intake system for use in internal combustion engine

DETAILED DESCRIPTION It is therefore an object of this invention to overcome the above-mentioned drawbacks and to provide an improved intake system for use in an internal combustion engine.
It is another object of the invention to provide an intake system for use in an internal combustion engine which makes it possible to instantaneously feed the air-fuel mixture into the combustion chamber simultaneously with the start of the intake stroke.
It is still another object of the present invention to provide an intake system for use in an internal combustion engine, which is not affected with the rotation frequency of the engine and which is capable of feeding a sufficient quantity of air-fuel mixture into the combustion chamber so as to enhance the charging efficiency of the engine, and to increase the output yet lowering the fuel consumption.
The above-mentioned objects of the present invention can be achieved by providing a supplemental chamber which is in communication with an intake passage at a position between a throttle valve and a check valve in an internal combustion engine.
The engine is of a type having a throttle valve and a check valve positioned at the downstream side of the throttle valve so as to permit the inflow of the air-fuel mixture but prevent the backflow of the air-fuel mixture in an intake pipe which is in communication with the interior of the cylinder of the engine by way of an intake valve.
The supplemental chamber serves to accumulate therein air-fuel mixture even after the closure of the check valve upon termination of the intake stroke.
For this, at the beginning of the next intake stroke, air-fuel mixture in the supplemental chamber is discharged into the combustion chamber prior to the air-fuel mixture supply from the throttle valve into the combustion chamber.
In the embodiment, the chamber is connected to a control passage whose downstream end is opened at the initially opening portion of the check valve.
For example, in case of the employment of a reed valve as the check valve, the downstream end opening is positioned adjacent to a free end of the reed of the reed valve