Valve timing control apparatus

摘要

A valve timing control apparatus includes a driving-side rotation member, a driven-side rotation member, a fluid chamber, an advanced angle chamber and a retarded angle chamber, a fluid control valve portion controlling supply and discharge of fluid relative to each of the advanced angle chamber and the retarded angle chamber, an accumulator accumulating a portion of fluid supplied to the fluid control valve portion from a pump at a fluid storage portion during an operation of an internal combustion engine and supplying fluid accumulated at the fluid storage portion to the fluid control valve portion at a start of the internal combustion engine, and a supply flow passage connecting the pump, the fluid control valve portion, and the accumulator in series. The accumulator includes a relief control valve portion configured to maintain a pressure of fluid accumulated at the fluid storage portion equal to or smaller than a predetermined value.

主权项

1. A valve timing control apparatus comprising:
a driving-side rotation member rotating in synchronization with a crankshaft of an internal combustion engine; a driven-side rotation member arranged coaxial with the driving-side rotation member and rotating in synchronization with a camshaft for opening and closing a valve of the internal combustion engine; a fluid chamber formed by the driving-side rotation member and the driven-side rotation member; an advanced angle chamber and a retarded angle chamber formed by divided portions of the fluid chamber divided by a partition portion that is provided at at least one of the driving-side rotation member and the driven-side rotation member; a fluid control valve portion controlling supply and discharge of fluid relative to each of the advanced angle chamber and the retarded angle chamber; an accumulator accumulating a portion of fluid supplied to the fluid control valve portion from a pump at a fluid storage portion during an operation of the internal combustion engine and supplying fluid accumulated at the fluid storage portion to the fluid control valve portion at a start of the internal combustion engine; and a supply flow passage connecting the pump, the fluid control valve portion, and the accumulator in series to cause fluid to flow therethrough, the accumulator including a relief control valve portion that is configured to maintain a pressure of fluid accumulated at the fluid storage portion equal to or smaller than a predetermined value.