ENGINE VALVE DEVICE

摘要

An engine valve device where a valve is opened and closed in a variable manner. The device can follow high speed operation of an engine, can operate efficiently, and operates the engine valve in a variable manner. The engine valve device has an air intake valve (3) for opening and closing an intake port by pressing force of a rotating cam and a pressing force of a valve spring, a piston (23) movable in the same direction as the air intake valve (3), a cylinder section (22) for receiving the piston (23) so that it can move inside the cylinder section, a hydraulic actuator (20) having the piston (23) and the cylinder section (22), a supply/discharge pipe line (21d) communicated with a pressure chamber formed by the piston (23) and the cylinder section (22), an accumulator (50) for accumulating under pressure a hydraulic oil flowed out of the pressure chamber via the supply/discharge pipe line (21d), and a electromagnetic open/close valve (30) for controlling the flow of the hydraulic oil between the pressure chamber and the accumulator (50). The electromagnetic open/close valve (30) is placed on the supply/discharge pipe line between the hydraulic actuator (20) and the accumulator (50).