Title:
VALVE MECHANISM
Document Type and Number:
Japanese Patent JPS6040711
Kind Code:
A
Abstract:
PURPOSE:To generate large force at the start of opening an exhaust valve to securely start the opening of said exhaust valve, by forming larger diameter and smaller diameter chambers in a cylinder chamber and also forming the corresponding piston into one having larger and smaller diameters, in a hydraulic cylinder device which opens and closes said exhaust valve. CONSTITUTION:When a first solenoid valve 21 is opened by means of a control device 20, hydraulic pressure enters a larger-diameter chamber 6 through a first oil passage 11, and a piston 8 is advanced by means of force acting on a larger diameter part 9. Thereby, an exhaust valve 3 starts to open its exhaust port 2, while the larger diameter part 9 closes a fourth oil passage 14. Because of the large diameter of the larger diameter part 9, the exhaust valve 3 can be securely opened with a less hydraulic pressure. When the piston 8 is further advanced, a third oil passage 13 connects the larger diameter chamber 6 of a cylinder chamber 5 with its smaller diameter chamber 7, causing hydraulic pressure in the larger diameter chamber 6 to enter the smaller diameter chamber 7, and the piston 8 is, then, advanced by means of force acting on a smaller diameter part 10. On the other hand, when the first solenoid valve 21 is closed and a second solenoid valve 22 is opened, the piston 8 is moved backward.
Inventors:
TAKESHITA YOSHIHIRO
Application Number:
JP14840983A
Publication Date:
March 04, 1985
Filing Date:
August 12, 1983
Export Citation:
Assignee:
YANMAR DIESEL ENGINE CO
International Classes:
F01L9/10; (IPC1-7): F01L9/02
Attorney, Agent or Firm:
Yamato Tsutsui
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