Abstract: In a valve open-and-closure timing changing apparatus for an internal combustion engine, a rotary body (3) is revolved in synchronization with a revolution of the engine, a camshaft (1) is provided, and a valve open-and-closure changing mechanism is interposed between the rotary body and the camshaft to relatively rotate the camshaft to the rotary body to enable a change in a valve open-and-closure timing of at least one of intake and exhaust valves.

Abstract: A valve timing control device disposed between a rotary element synchronously rotating with an engine and a camshaft actuating the engine valve, comprising a housing adapted to rotate with one of the rotary element and the camshaft and a vane rotor within the housing. The vane rotor has an axial bore having an open end and pressure chamber-side fluid passages open to the axial bore and is adapted to rotate with the other of the rotary element and the camshaft. Vanes radially extending from the vane rotor define within the housing fluid pressure chambers communicating with the pressure chamber-side fluid passages, respectively. A fluid control mechanism controls supply and discharge of a hydraulic fluid relative to the fluid pressure chambers. A shaft is received in the axial bore and formed with pressure source-side fluid passages connecting the pressure chamber-side fluid passages with the fluid control mechanism.

Abstract: In a variable valve timing controlling apparatus for an internal combustion engine having an engine valve, the controlling apparatus having:a rotational body rotated in synchronization with an engine crankshaft;a camshaft, one end thereof being inserted into the rotational body and the camshaft including a cam located on an outer periphery of the camshaft to open the engine valve against a spring force exerted by a valve spring of the engine valve; a phase changing device interposed between the rotational body and the one end of the camshaft to hydraulically vary a relative rotational phase between the rotational body and the camshaft; and a hydraulic pressure circuit to relatively supply and drain a hydraulic pressure to and from at least one retardation angle hydraulic pressure chamber and at least one advance angle hydraulic pressure chamber, each hydraulic pressure chamber being formed within the rotational body to drive the cam phase changing device, an interrupting mechanism is provided to interrupt a h