Title:
APPARATUS FOR DRIVING VARIABLE VALVE MECHANISM
Document Type and Number:
Japanese Patent JPS59113220
Kind Code:
A
Abstract:
PURPOSE:To reduce power loss of a pump in a resistance valve unit for feeding oil not supplied to a cylinder of a variable valve mechanism to various sliding parts of an engine, by employing such an arrangement that the valve opening pressure is variable and a valve of the resistance valve unit is opened at a low pressure when the engine speed is low. CONSTITUTION:The operation of an intake valve and an exhaust valve is controlled by feeding oil to a hydraulic cylinder 50 and using a high-speed cam 61 or a low-speed cam 62 selectively. Oil not supplied to the hydraulic cylinder 50 is passed through a resistance valve unit 11 and supplied to various sliding parts of an engine via a passage 12. A valve body 13 of the resistance valve unit 11 is opened depending on the pressure in a piston chamber 17. When the hydraulic pressure is lowered and a spool valve 21 is moved to the left, supply of oil to the piston chamber 17 is stopped, so that the valve body 13 is opened even at a low pressure due to drop of pressure in the chamber 17. Therefore, it is enabled to reduce the power loss of a pump.
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Inventors:
KOSUDA TOORU
KATOU HIROKI
KUMAI TERUO
HIYOSHI TSUTOMU
NAKAMURA HIDEO
KATOU HIROKI
KUMAI TERUO
HIYOSHI TSUTOMU
NAKAMURA HIDEO
Application Number:
JP22208482A
Publication Date:
June 29, 1984
Filing Date:
December 20, 1982
Export Citation:
Assignee:
NIPPON SOKEN
TOYOTA MOTOR CO LTD
TOYOTA MOTOR CO LTD
International Classes:
F01L13/00; (IPC1-7): F01L1/18
Domestic Patent References:
| JPS54140015A | 1979-10-30 |
Attorney, Agent or Firm:
Aoki Akira