465results about "Valve camshafts" patented technology

A variable camshaft timing apparatus (10) includes a pulse actuating circuit (24A, 50, 44, 56, 60, 24R and 24R, 52, 46, 54, 58, 24A) for oscillating the variable camshaft timing apparatus in reaction to fluid under pulsation, and includes a pressure actuating circuit (30, 34, 36, 40, 44, 50, 24A, 24R, 52, 46, 66, 80 / 180, 32 and 30, 34, 38, 42, 46, 52, 24R, 24A, 50, 44, 64, 80 / 180, 32) for oscillating the variable camshaft timing device in reaction to fluid under pressure. Advance and retard valves (44, 46) are interconnected with the pulse and pressure actuating circuits for independently and simultaneously activating the pulse and pressure actuating circuits. Finally, an exhaust valve (80, 180, 280) is positioned in fluid communication with the pulse and pressure actuating circuits, such that the variable camshaft timing device may be oscillated using one or both of the pulse actuating and pressure actuating circuits, and may be maintained in position using one or both of the pulse actuating and pressure actuating circuits.

A valve gear mechanism for an internal combustion engine, capable of changing valve-opening characteristics of a valve. The mechanism can smoothly change valve-opening characteristics by using a simplified structure without causing an increase in the number of parts and without causing an increase in sliding friction. A valve gear has a switching mechanism (24) for switching connection and disconnection between rocker arms (32, 34) arranged between a valve (18) and cams (14, 16). When a slide pin (58) reaches an displacement end (Pmax2) in the direction in which a slide pin (58) is retracted,the urging force of a return spring (56) acting on switching pins (48, 54L, 54R) is received by an engaging portion, formed between a notch (58e) provided in the slide pin (58) and a rock pin (70), with the engaging portion separated from a camshaft (12).

A valve timing control apparatus of an internal combustion engine that includes a biasing device that applies bias force to a camshaft of intake or exhaust valves so as to bring the valve timing of the engine into a predetermined state when the valve timing is in a predetermined range, for example, when the valve timing is on the retard side of the engine start valve timing with which the engine is started is controlled by a controller that controls the valve timing in view of the bias force of the biasing device.