Patent ID: 7363898
Filing Date: 2008-04-29
Classification: F01L

Abstract:
1. A valve timing control device comprising: a driving side rotational member synchronously rotatable with a crankshaft of an internal combustion engine; a driven side rotational member arranged coaxially with the driving side rotational member and synchronously rotatable with a camshaft that controls an opening and closing operation of valves of the internal combustion engine; a retarded angle chamber defined by the driving side rotational member and the driven side rotational member and displacing a relative rotational phase of the driven side rotational member to the driving side rotational member in a retarded angle direction by a supply of a fluid to the retarded angle chamber; an advanced angle chamber defined by the driving side rotational member and the driven side rotational member and displacing the relative rotational phase in an advanced angle direction by the supply of the fluid to the advanced angle chamber; a fluid supply and discharge mechanism for supplying the fluid to the advanced angle chamber and the retarded angle chamber and for discharging the fluid from the advanced angle chamber and the retarded angle chamber; a lock mechanism for locking the relative rotational phase at a predetermined lock phase; a phase displacement restriction mechanism operable separately from the lock mechanism and switching the relative rotational phase between a restricted state in which a displacement of the relative rotational phase is restricted within a predetermined phase displacement allowable range and an unrestricted state in which the restricted state is released; the phase displacement restriction mechanism including a recess portion and an insertion member inserted into the recess portion so as to achieve the restricted state and retraced from the recess portion so as to achieve the unrestricted state, the recess portion provided at one of the driving side rotational member and the driven side rotational member, the insertion member provided at the other one of the driving side rotational member and the driven side rotational member, the insertion member biased to be inserted into the recess portion; and a retention mechanism for retaining the phase displacement restriction mechanism in the unrestricted state in which the insertion member is retracted from the recess portion, wherein the retention mechanism includes a first passage by means of which a portion of the fluid supplied to the advanced angle chamber is supplied to a receiving portion within which the insertion member is slidably accommodated, and a second passage by means of which a portion of the fluid supplied to the retarded angle chamber is supplied to the receiving portion.