Valve system for overhead valve type four-cycle engine
A valve system is described for the overhead valve type four-cycle engine disposing the intake and exhaust valves substantially symmetrically to each other with respect to the cylinder center line, where the valve stems are so tilted in the cylinder head that the valve bodies are in juxaposition close to the cylinder center line, comprising: for each cylinder, two guide cams disposed around the circumferential surfaces of two crank shafts extending on each side of a crank pin. Each cam has a shape of a ''figure-eight'' folding around the crank shaft while returning back to the starting point in two turns, and also having one projection in the course of the turn; two sliding pieces each has an arm extending sideways at the lower end of a stem and engages at the other end of the arm with one of the guide cams. The stem of the sliding piece is able to slide parallel to the cylinder center line along a guide hole disposed in the cylinder as well as to rotate about its own axis; two push rods each engages at the lower end with the top end of one of the sliding pieces and the two push rods extending essentially parallel to and symmetrical with respect to the cylinder center line; and two rocker arms are supported at the center by a common rocker shaft disposed in the center of the cylinder head, and each engaging at one end with the top end of one of the push rods. At the other end is the top end of one of the valve stems of the intake or exhaust valve. The projection on the guide cam for the intake or exhaust valve is disposed at such a place as to engage with the sliding piece at the rotational angle of the crank shaft corresponding to the opening timing of the intake or exhaust valve.
- Assignee:
- Kawasaki Jukogyo Kabushiki Kaisha, Hygo
- Patent Number(s):
- US 4683847
- OSTI ID:
- 6043113
- Resource Relation:
- Patent File Date: Filed date 20 Dec 1985
- Country of Publication:
- United States
- Language:
- English
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