Four-stroke cycle internal combustion engine

Details Four-stroke cycle internal combustion engine Four-stroke cycle internal combustion engine

1998-10-01

1999-09-07

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

Camshaft drive means

123 9034, 123 4186, 123572, F01M 100, F01M 300

Patent

active

059470682

ABSTRACT:
An OHC type four-stroke cycle internal combustion engine comprises a crankshaft, a camshaft, a camshaft bearing for supporting the camshaft, a cam chamber for accommodating the camshaft, a gear train for transmitting the rotation of the crankshaft to the camshaft, a gear chamber for accommodating the gear train, a crankcase communicating with the cam chamber via the gear chamber, an inlet port, and a piston. The camshaft has a camshaft through hole which communicates with the cam chamber at one end and opens toward its circumferential surface supported by the camshaft bearing at the other end. The camshaft bearing has a camshaft bearing through hole which communicates with the camshaft through hole at one end and communicates with the inlet port at the other end. The camshaft through hole and the camshaft bearing through hole communicate with each other by the rotation of the camshaft when the pressure in the crankcase is increasing as a result of a downward movement of the piston thereby communicating the cam chamber with the inlet port, and does not communicate with each other when the pressure in the crankcase is decreasing as a result of an upward movement of the piston thereby shutting off the communication between the cam chamber and the inlet port.

REFERENCES:
patent: 4651704 (1987-03-01), Sekiguchi
patent: 4840149 (1989-06-01), Fujita
patent: 4974561 (1990-12-01), Murasaki et al.
patent: 5111782 (1992-05-01), Mezger
patent: 5243937 (1993-09-01), Imagawa
patent: 5690084 (1997-11-01), Gunji et al.
patent: 5706769 (1998-01-01), Shimizu

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