Valve system for overhead valve internal combustion engine
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsTakashi Shichinohe, Yukio Ishiuchi
Life of this patent
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Abstract
An intake cam and an exhaust cam are formed integrally with a cam shaft, and a decompression cam is additionally provided adjacently to the front side of the exhaust cam. A rib is formed in back of the intake cam. A cylindrical surface portion having a diameter being the same as that of the outer periphery surface of a ball bearing for supporting the front portion of the cam shaft and being larger than the diameter of the base circle of the cam shaft, is formed on the front crank case, and a locking stepped portion is formed in back of the cylindrical surface portion. Cutout portions are formed in the locking stepped portion so that the cam shaft can be pulled forward in the state that the intake cam, exhaust cam and the decompression cam are arranged.
Claims15
A valve system for an internal combustion engine having a cam shaft axially removably supported and push rods mounted for reciprocation on an upper surface of said cam shaft through tappets for opening/closing overhead valves comprising:
- a crankcase for mounting said cam shaft for rotation;
- an opening formed in said crankcase for removing said cam shaft from said crankcase, said opening being of a predetermined size larger relative to size of a cam base circle and smaller in size relative to a size of a cam lobe vertex;
- cutout portions formed in said crankcase being larger in size relative to said cam lobe vertex, said cutout portions being provided on part of said opening;
- said cutout portions being disposed at positions facing tappets relative to an axial center of said cam shaft;
- and
- a rib projecting from said cam base circle and being disposed on said cam shaft on the opposed side to said opening with said cam lobe being positioned therebetween.
A valve system for an internal combustion engine having a cam shaft axially removably supported and push rods mounted for reciprocation on an upper surface of said cam shaft through tappets for opening/closing overhead valves comprising:
- a crankcase for mounting said cam shaft for rotation;
- an opening formed in said crankcase for removing said cam shaft from said crankcase, said opening being of a predetermined size larger relative to size of a cam base circle and smaller in size relative to a size of a cam lobe vertex;
- and
- cutout portions formed in said crankcase being larger in size relative to said cam lobe vertex, said cutout portions being formed to permit said cam shaft to be removed from said crankcase when said cam lobe vertex is aligned with said cutout portions.
Dependencies are inferred from the claim text.