Patent Number: 6,332,444

Title: Lubricating device for internal combustion engine

Abstract: A power unit includes an engine portion and a transmission portion. Thebottom portion of a crankcase of the power unit is formed into a shape, inwhich the right and left sides thereof are tilted downwardly toward acentral portion. A main shaft, a counter shaft, and an output shaft of atransmission chamber are disposed one above the other on a right side of acrankshaft. An oil tank is disposed on a right side of the transmission. Abulkhead divides the transmission chamber from the oil tank. The oil tankis formed into an approximately crescent shape with its lower endextending under the output shaft. A suction port of a feed pump isprovided in the lowest portion of the crescent shaped oil tank. An oilinlet is provided directly over the oil tank. An overflow hole forallowing oil to overflow into a transmission chamber is provided in thebulkhead. An oil pump is provided in the crank case on the left side ofthe crank shaft. A scavenging pump pumps up oil from an oil sump locatedat the lowest portion of the bottom of the crank case. A drain hole,provided in a lower portion of the crank case, communicates to both theoil tank and the transmission chamber. The drain hole is plugged with adrain bolt.

Inventors: Narita; Satoru (Saitama, JP), Kubota; Toshiyuki (Saitama, JP), Takano; Noriaki (Saitama, JP)


International Classification: F01M 1/00 (20060101); F01M 1/12 (20060101); F02B 61/02 (20060101); F02B 61/00 (20060101); F01M 011/00 ()

Expiration Date: 12/25/2014