公开(公告)号：JPH0777018A

公开(公告)日：1995-03-20

申请号：JP22078394

申请日：1994-08-24

Applicant: ACRO TECH INC

Inventor： REJII DOUEIN HAFU

IPC: F01L1/28 ,  F01L3/20 ,  F01L9/00

Abstract: PURPOSE: To allow a wide timing range of a vent and to improve engine performance by providing a multi-layer passage automatically sucking and discharging air in two stages and feeding and discharging much air to an internal combustion engine. CONSTITUTION: When a piston descends, a quick pressure drop occurs in a combustion chamber 3, and its acting force is applied to the head of an inner valve. When this acting force becomes larger than the acting force to a holding pin 40A by inner valve control springs 41A, 42A, the inner valve is displaced to an opening position independently of an outer valve and allows the flow of the air-fuel mixture of the combustion chamber 3 from a port through the vent 23A of the outer valve. The operating speed, period and displacement are determined by the level of the load of an inner valve spring, and the slot 24A of the holding pin 40A determines the maximum displacement range of the inner valve. The action of the inner valve is independent of the action of the outer valve, thus this valve mechanism automatically responds to the changed timing, period and displacement, and its useful output range is remarkably expanded.