Abstract: A structure for a camshaft includes a cam angle detecting element arranged to face a cam angle sensor and supported in a cantilever manner by a cam journal on the outer side of the cam journal. An extension journal between the cam journal and the cam angle detecting element is enlarged toward the cam journal such that the external diameter on the side of the cam journal may be larger than the external diameter on the side of the cam angle detecting element.

Abstract: A power steering system for a vehicle having a power cylinder to which a hydraulic fluid delivered from a pump driven by an engine is supplied through a fluid passage switching valve includes a pressure control valve provided in a branched fluid passage extending from a high pressure fluid passage between the pump and the switching valve to a reaction piston in the switching valve, and having a degree of opening controlled by a pilot pressure, and a pilot pressure control valve provided in a low pressure fluid passage having one end connected through an orifice to the branched fluid passage downstream of the pressure control valve and another end leading to a fluid reservoir.