Patent ID: 9506378
Filing Date: 2016-11-29
CPC Classification: F01L

Claim Text:
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 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.