VARIABLE VALVE TIMING CONTROL APPARATUS OF INTERNAL COMBUSTION ENGINE

摘要

A variable valve timing control apparatus has drive rotary member having therein working chambers; vane rotor relatively rotatably housed in the drive rotary member and defining the working chambers as retard and advance working chambers; and spiral spring forcing the vane rotor all the time in one rotation direction with respect to the drive rotary member. The vane rotor has tubular portion formed integrally with the vane rotor and protruding from a middle position of one end side of the vane rotor and recessed portion formed on an outer peripheral surface of the tubular portion. Engaging end of outermost circumferential portion of the spiral spring is engaged with the drive rotary member, and engaging end of innermost circumferential portion of the spiral spring is engaged with the tubular portion, and a part of the innermost circumferential portion of the spiral spring is inserted in the recessed portion.

主权项

1. A variable valve timing control apparatus of an internal combustion engine, comprising:
a drive rotary member to which a turning force is transmitted from an engine crankshaft and which has therein working chambers; a vane rotor relatively rotatably housed in the drive rotary member and defining the working chambers as a retard working chamber and an advance working chamber, the vane rotor having
(a) a tubular portion that is formed integrally with the vane rotor and protrudes from a middle position of one end side in an axial direction of the vane rotor to an outside of the drive rotary member; and(b) a recessed portion that is formed on an outer peripheral surface of the tubular portion and is recessed in a radially inward direction on the outer peripheral surface of the tubular portion, the recessed portion having side wall surfaces on both sides in the axial direction of the recessed portion; and a spiral spring forcing the vane rotor all the time in one rotation direction with respect to the drive rotary member, and an engaging end of an outermost circumferential portion of the spiral spring being engaged with the drive rotary member, and an engaging end of an innermost circumferential portion of the spiral spring being engaged with the tubular portion, and a part of the innermost circumferential portion of the spiral spring being inserted in the recessed portion.