Valve operating device in internal-combustion engine

Abstract

Abstract PURPOSE:To relieve impact upon closing of itake and exhaust valves, by controlling the lift of each of the intake and exhaust valves with the use of the relative angular position between inner and outer cylinder in a valve lifter, and as well by providing a damper chamber between the outer cylinder and the cylinder head. CONSTITUTION:The lift of a cam 10 is transmitted to an intake valve or an exhaust valve 12 by means of a hydraulic lifter 17 which slides in a lifter hole 181 in a cylinder head 18. The hydraulic lifter 17 is composed of bottomed inner and outer cylinders 20, 22 in which a reservoir chamber 32 and a high-pressure chamber 30 are defined. Since a groove 40 is formed in the inside of the outer cylinder 22 while an inclined lead 33 is formed in the bottom section of the inner cylinder 20, the cut-off position of the communication between the high pressure chamber 30 and the reservoir chamber 32 is adjusted by controlling the relative angular position between the inner and outer cylinders through a drive shaft 52, a sector gear 50 and a tooth section 203, and therefore, the lift of the valve is controlled. Further, a damper chamber 70 between the outer cylinder 22 and the cylinder head 18 relives impact upon closing of the valve.

Inventors

• 👤 Nobuo Habu
• 👤 土生　信男

Bibliographic Details