Patent Number: 6,253,718

Title: Exhaust control valve assembly for an engine

Abstract: An exhaust control valve assembly for a two-cycle engine is formed to effectively dissipate heat. The exhaust control valve includes a pair of valve elements disposed on opposite sides of a reinforcing wall. The reinforcing wall laterally bisects an opening of the exhaust port in a vertical direction. A valve stem is connected to bosses of the valve elements. The valve stem is supported in a rotatable manner by a pouch-shaped hole at one end and a through-hole at its other end. A drive system is coupled to an end part of the valve stem protruding outwards from the through-hole. The whole of the bosses of the valve elements is offset from the center of the reinforcing wall towards the through-hole. This arragnement allows heat, resulting from the exhaust gases passing by the valve elements, to be dissipate without overheating the valve stem on the pouch-shaped hole side.

Inventors: Uchida; Hiroyuki (Saitama, JP), Hara; Shigeyuki (Saitama, JP), Fukusho; Tsutomu (Saitama, JP)

Assignee: Honda Giken Kogyo Kabushiki Kaisha

International Classification: F02F 1/22 (20060101); F02D 9/08 (20060101); F01L 3/20 (20060101); F01L 3/00 (20060101); F02D 9/10 (20060101); F02F 1/18 (20060101); F02B 75/02 (20060101); F02B 075/02 ()

Expiration Date: 07/03/2018