Patent ID: 9080475
Filing Date: 2015-07-14
Classification: F01L

Abstract:
1. A valve timing control device comprising: a driving-side rotating member that rotates in synchronization with a crankshaft of an internal combustion engine; a driven-side rotating member, disposed coaxially with the driving-side rotating member, that rotates in synchronization with a cam shaft for opening and closing a valve of the internal combustion engine; a fluid pressure chamber formed by the driving-side rotating member and the driven-side rotating member; a partition portion provided in at least one of the driving-side rotating member and the driven-side rotating member so as to partition the fluid pressure chamber into an advanced angle chamber and a retarded angle chamber; a restriction member that is disposed in one of the driving-side rotating member and the driven-side rotating member and that is capable of extending/retracting into/from the other of the rotating members; a restriction recess, formed in the other of the rotating members, into which the restriction member is inserted and that restricts a relative rotational phase of the driven-side rotating member relative to the driving-side rotating member to a range from one of a maximum advanced phase and a maximum retarded phase to a predetermined phase between the maximum advanced phase and the maximum retarded phase; a lock member that is disposed in the one rotating member in which the restriction member is provided and that is capable of extending/retracting into/from the other of the rotating members; a locking recess, formed in the other of the rotating members, into which the lock member is inserted and that locks the relative rotational phase of the driven-side rotating member relative to the driving-side rotating member in the predetermined phase; and a communication flow path formed between the restriction member and the lock member, wherein the device can switch between: a first state in which a fluid is supplied to the communication flow path, the restriction by the restriction member is lifted, and the locking by the lock member is released; a second state in which the fluid is supplied to one of the advanced angle chamber and the retarded angle chamber, the locking by the lock member is released, and the restriction member sets the restriction; and a third state in which the fluid is not supplied to the communication flow path and is not supplied to the one of the advanced angle chamber and the retarded angle chamber, the restriction member sets the restriction, and the lock member carries out locking, and wherein a minimum cross-sectional area of a flow path that supplies the fluid to the advanced angle chamber is configured to be greater than a minimum cross-sectional area of a flow path that supplies the fluid to the retarded angle chamber.