Valve timing control apparatus

摘要

A valve timing control apparatus has a regulation member to fix a phase. The regulation member has a main regulation member and a sub regulation member. The main regulation member is inserted into a recess part to regulate the phase. The sub regulation member has an engagement part engageable with the main regulation member in an escape direction Y and disengageable from the main regulation member in an insertion direction X. Further, the sub regulation member has a pressure reception part that receives pressure in the escape direction Y from hydraulic fluid in an operation chamber. The main regulation member is urged in the insertion direction X by a main resilient member. Further, the sub regulation member is urged in the insertion direction X by a sub resilient member. The main regulation member moves in the escape direction Y only by hydraulic fluid, and moves in the insertion direction X only by the resilient member.

主权项

1. A valve timing control apparatus applied to an internal combustion engine, in which a camshaft opens and closes a drive gear by torque transmission from a crankshaft, the valve timing control apparatus controlling valve timing of the drive gear with hydraulic fluid supplied from a supply source in accordance with rotation of the internal combustion engine, the valve timing control apparatus comprising:
a housing configured to rotate in synchronization with the crankshaft; a vane rotor that is configured to rotate in synchronization with the camshaft and has a vanes to define an advance chamber and a retard chamber arranged in a rotational direction in an interior space of the housing, the vane rotor changing a rotational phase to an advance side or a retard side with respect to the housing by introduction of hydraulic fluid to the advance chamber or the retard chamber; and a regulation member reciprocally movably received in one of the vane rotor and the housing, the regulation member moving in an insertion direction to be inserted into a recess part formed at the other one of the vane rotor and the housing to regulate the rotational phase at a regulation phase between a full advance phase and a full retard phase, the regulation member moving in an escape direction to escape out of the recess part to release the rotational phase from regulation, wherein: the housing forms an opening hole opened to atmosphere; the vane rotor forms: an advance communication hole that communicates with the advance chamber; and a retard communication hole that communicates with the retard chamber; and a predetermined member moves from an interruption position at which communication between the advance communication hole and the retard communication hole is prohibited, to communicate the opening hole with a space formed between the advance communication hole and the retard communication hole.