US 5,704,315 AGranted

Valve operating system in SOHC-type engine

AssigneeHonda Giken Kogyo Kabushiki Kaisha

InventorsKoji Tsuchida, Chikara Tanaka, Jiro Takagi, Hirokazu Ohsaki

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Abstract

In an engine including a variable timing/lift mechanism for an intake valve, journal portions of a valve-operating cam shaft are supported on cam bearing portions integrally provided in a cylinder head, and an intake rocker shaft is fixed by bolts to rocker shaft fixing portions provided on an upper surface of the cam bearing portions. By bringing opposite sides of intake rocker arms swingably supported on the intake rocker shaft into slidable abutment against positioning faces integrally formed on opposite sides of the cam bearing portions, the intake rocker arms are positioned in a thrust direction. Thus, it is possible to accurately and easily position the intake rocker arms in the thrust direction without the need for a special member.

Claims6

Dependent claims

A valve operating system in a single overhead camshaft (SOHC) type engine comprising a hydraulic actuator which switches the states of connection between a plurality of intake rocker arms driven by a plurality of intake cams provided on a valve-operating cam shaft, thereby controlling at least one of a timing and a lift of an intake valve,

wherein said valve operating system includes:
cam bearing portions integrally formed to a cylinder head for supporting cam journal portions having a diameter larger than that of a locus of rotation of cam lobes of the intake cams;
rocker shalt fixing portions integrally extended axially of the valve-operating cam shaft from said cam bearing portions for fixing the intake rocker shafts by bolts, said plurality of intake rocker arms being disposed in proximity to one another between the adjacent rocker shaft fixing portions;
and
positioning surfaces formed at opposed regions of said adjacent rocker shaft fixing portions for positioning said intake rocker arms in a thrust direction.

2 more elements

Dependencies are inferred from the claim text.