The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 07, 1999
Filed:
Oct. 01, 1998
Tsuneo Araki, Hinode-machi, JP;
Kioritz Corporation, Tokyo, JP;
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.