Patent ID: 8051815
Filing Date: 2011-11-08
Classification: F01L,F02D

Abstract:
1. An engine comprising: a valve provided for a cylinder head of the engine; a valve energizing member for energizing the valve in the direction of closing the valve; a valve drive cam rotated in correspondence with rotation of a crankshaft of the engine; a valve stopping mechanism operatively provided between the valve drive cam and the valve and, on the basis of a stop hydraulic fluid pressure supplied from outside and an operation energizing member for generating an energizing force against the stop hydraulic fluid pressure, selectively generating an operating state of opening/closing the valve in response to an operation of the valve drive cam and a stop state of holding the valve in a valve closing position irrespective of the operation of the valve drive cam; and a stop hydraulic fluid pressure supply controller for controlling the supply of the stop hydraulic fluid pressure; wherein the valve stopping mechanism generates the operating state when the energizing force of the operation energizing member is larger than the press force of the stop hydraulic fluid pressure, and generates the stop state when the press force of the stop hydraulic fluid pressure is larger than the energizing force of the operation energizing member; and the stop hydraulic fluid pressure supply controller includes: a valve body; a switching member movable within the valve body between a hydraulic fluid supply position in which a pressure source path is connected to a pressure source for supplying the stop hydraulic fluid pressure and a stop pressure supply path for supplying the stop hydraulic fluid pressure to the valve stopping mechanism are communicated with each other, and a hydraulic fluid discharging position for closing the pressure source path and making the stop pressure supply path communicated with a drain side; a switching energizing member applying a force at one end of the switching member for energizing the switching member to move to a hydraulic fluid supply position side; and a switching pressure supply control mechanism for applying a pressure force at an opposite end of the switching member to move the switching member to a hydraulic fluid discharge position side, the switching pressure supply control mechanism being attached to the valve body in a position offset relative to an axis of the switching member.