Patent Number: 6,332,440

Title: Four-stroke cycle internal combustion engine

Abstract: The four-stroke cycle internal combustion engine for portable workingmachines, which employs a toothed belt in the power transmission mechanismthereof, is disclosed. There is provided an OHC type four-stroke cycleinternal combustion engine including a power transmission mechanismdisposed vertically along a cylinder portion for transmitting the rotationof a crankshaft to a camshaft, wherein the power transmission mechanismcomprises intermediate transmission members linked to the camshaft througha toothed belt and a rotation speed transmission member for reducing therotation speed from the crankshaft and for transmitting it to theintermediate transmission members.

Inventors: Nagai; Noboru (Hachiouji, JP), Liu; Yumin (Fussa, JP), Araki; Tsuneo (Tokyo, JP)

Assignee:

International Classification: F01L 1/053 (20060101); F01L 1/04 (20060101); F01L 1/02 (20060101); F02B 63/02 (20060101); F02B 63/00 (20060101); F02B 75/02 (20060101); F01L 001/053 (); F16H 007/02 ()

Expiration Date: 12/25/2014