Cylinder head cooling structure for four-cycle engine

Abstract

Abstract PURPOSE:To uniformalize the temperature distribution of a cylinder head at an engine equipped with three air intake valves and two exhaust valves, by constituting exhaust passages with two independent exhaust passages, and forming a head side liquid cooled jacket between both independent exhaust passages. CONSTITUTION:At an engine in which three air intake valves 23-25 and two exhaust valves 26,27 are collected at one side of a combustion chamber and the other side thereof and also, are arranged so as to be along the perimeter wall of the combustion chamber, three air intake valve openings 17-18 are led out backward by means of three branching off air intake passages 31a-31c formed in parallel mutually, and are converged at one common air intake passage 31 within a cylinder head 11, and then, are led out to the back wall of the cylinder head. Also, two exhaust valve openings 20,21 are led out to the front wall of the engine by means of two independent exhaust passages 32,32 formed separately so as to extend to an oblique outer part. And a head side water cooled jacket 15 formed so that is may possess a front portion 15a which extends to a space between independent exhaust passages 32,32.

Inventors

• 👤 Isao Morishita
• 👤 森下　勲

Bibliographic Details