MEASURES AGAINST OVERLAP TIME OF SIMULTANEOUS OPENING INTAKE VALVE AND EXHAUST VALVE FOR MIXTURE WHEN PISTON VALVE IS USED IN FOUR-CYCLE GASOLINE ENGINE, MEASURES AGAINST OVERLAP TIME OF SIMULTANEOUS OPENING INTAKE VALVE AND EXHAUST VALVE FOR MIXTURE WHEN PISTON VALVE IS USED IN FOUR-CYCLE GASOLINE ENGINE OTHER THAN ACTUAL COMPRESSION STROKE IN COMPRESSION STROKE, METHOD FOR TAKING ACTUAL EXPANSION STROKE LONGER AS PISTON STROKE IN EXPANSION STROKE THAN ACTUAL COMPRESSION STROKE IN COMPRESSION STROKE AND MEASURES AGAINST EXCESSIVE LONG STROKE TO BE TAKEN, AND AUXILIARY DEVICE FOR VALVES IN MEASURES AGAINST OVERLAP IN SIMULTANEOUS OPENING OF INTAKE AND EXHAUST VALVES AND FOR VALVES IN MEASURES AGAINST TAKING EXCESSIVE LONG STROKE AS PISTON STROKE IN EXPANSION STROKE

摘要

PROBLEM TO BE SOLVED: To provide a four-cycle engine equipped with piston valves managing well with eventual overlapping of simultaneously opening intake valve for mixture gas and exhaust valve. SOLUTION: The four-cycle engine having piston valves is furnished with an intake valve for mixture gas and an exhaust valve, and further valves (a, b, c), whereby a method is established, in which the actually expansion stroke in the expansion stroke is taken longer in terms of piston stroke than the actually compressing stroke in the compression stroke, and also a countermeasure against excessive long setting is established.