Device for driving intake valve of engine

Abstract

Abstract PURPOSE:To improve the combustion in an engin in its slow revolution, by providing a valve driving device with a thick cam of cangeable profile and increasing the ratio of change in the lift of the intake valve of the engien at the time of the opening of the valve in the slow revolution to intensify the swirl in the cylinder of the engine. CONSTITUTION:A thick cam 14 for controlling the opening and closing of an intake vale 3 synchronously with the rotation of a crankshaft is connected through a cam shaft 10, a piston 16, a hydraulic chamber 19 and a passage 20 to the hydraulic chamber of a hydraulic controller 21 coupled to an oil pump 25, which is driven by the crankshaft. In the slow revolution of the engin, the right-hand part C of the cam 14 is put in contact with the top 9 of the intake valve 3. In the rapid revolution of the engine, the left-hand part B of the cam 14 is slid so that its left-hand part B is put in contact with the top 9 of the intake valve 3. The profile of the right-hand part C of the cam 14 is shaped as shown at (b) of the drawing. The profile of the left-hand part B of the cam is shaped as shown at (a) of the drawing. As a result, the ratio of change in the lift of the valve 3 at the time of its opening in the slow revolution of the engine is made large.

Inventors

• 👤 Shigeru Sakurai

Bibliographic Details