Variable valve timing control apparatus of internal combustion engine

摘要

A variable valve timing control apparatus has a housing having a plurality of working fluid chambers, a vane member rotatably housed in the housing and dividing the each working fluid chamber into advance and retard oil chambers, the vane member rotating to a most-advanced angle side and to a most-retarded angle side within a predetermined angle range relative to the housing, and a torsion spring, one end of which is retained by the housing and the other end of which is retained by the vane member. When the vane member rotates to the most-advanced angle side and to the most-retarded angle side, an angle formed by a line connecting the both ends of the torsion spring through an axial center of the vane member ranges from an angle positioned at one side to an angle positioned at the other side of a boundary with 180° being the boundary.

主权项

1. A variable valve timing control apparatus of an internal combustion engine, comprising:
a housing to which a turning force is transmitted by an engine crankshaft and which has a plurality of working fluid chambers in an inner circumference of the housing; a vane member rotatably housed in the housing and dividing the each working fluid chamber into an advance oil chamber and a retard oil chamber, the vane member rotating to a most-advanced angle side and to a most-retarded angle side within a predetermined angle range relative to the housing; and a torsion spring, one end of which is retained by the housing and the other end of which is retained by the vane member, and when the vane member rotates to the most-advanced angle side and to the most-retarded angle side relative to the housing, an angle in a circumferential direction formed by a line connecting the one end and the other end of the torsion spring through an axial center of the vane member ranging from an angle positioned at one side to an angle positioned at the other side of a boundary with 180° being the boundary.