Patent ID: 8863706
Filing Date: 2014-10-21
Classification: F01L,F02B,F16K

Abstract:
1. A four-stroke cycle engine comprising: a valve biased by a valve spring toward its closed position, and a hydraulic actuating system including: an output hydraulic chamber within a cylinder head, an output piston moveable backwards and forwards in said output hydraulic chamber for opening said valve against said valve spring, an input hydraulic chamber facing an outer periphery of a crankshaft, an input piston moveable backwards and forwards in said input hydraulic chamber arranged for driving said output piston via hydraulic fluid, a cam coaxial with said crankshaft for actuating said input piston in a way that one rotation of said cam causes the input piston to move backwards and forwards once, a hydraulic control valve, an output passageway connecting said output hydraulic chamber to said hydraulic control valve, and an input passageway connecting said input hydraulic chamber to said hydraulic control valve, said hydraulic control valve including: an output-enabling state, which enables pressure-transmission communication between said input passageway and said output passageway at least during a period for one cycle of reciprocating motion of the input piston beginning with the moment when, under action of said cam, said input piston begins to move from its rest position in a direction decreasing volume of said input hydraulic chamber and ending with the moment when said input piston subsequently returns to its rest position, and an output-disabling state, which disables the pressure-transmission communication at least during the period for one cycle of reciprocating motion of said input piston, said hydraulic control valve assuming one of said output-enabling state and said output-disabling state in every other rotation of said cam and the other in an adjacent rotation of said cam, the four-stroke cycle engine further comprising a second valve biased by a second valve spring toward its closed position, wherein said first mentioned valve and said second valve are an intake valve and an exhaust valve, and wherein said hydraulic actuating system includes a first hydraulic actuating subsystem for controlling said intake valve and a second hydraulic actuating subsystem for controlling said exhaust valve.