Apparatus and method of adjusting valve timing for internal combustion engine

A method of adjusting valve timing for internal combustion engine including a housing having an inner space while interlocking with a crank shaft;

• a rotor having a plurality of vanes, each vane forming an advance chamber in a direction of adjusting an advance phase angle and a retard chamber in a direction of adjusting a retard phase angle, and each vane mounted at the inner space of the housing while being interlocked with a cam shaft;
• and a locking pin member including a hollow outer pin elastically mounted at a locking chamber formed at the vane, and an inner pin elastically mounted at an inside of the outer pin, and preventing rotation of the rotor by being coupled to the housing using a torque transmitted from the cam shaft while adjusting a valve timing at an intermediate position between a full advance phase angle position and a full retard phase angle position of the rotor, the method comprising:
• discharging working fluid of the advance chamber, the retard chamber, and the locking chamber when the engine is in a stationary state;
• supplying the working fluid to the advance chamber and the retard chamber and discharging the working fluid of the locking chamber during an idling rotation state of the engine;
• and
• supplying the working fluid to the locking chamber and selectively supplying the working fluid to the advance chamber or to the retard chamber during a normal engine operational state.

A method of adjusting valve timing for internal combustion engine including a housing having an inner space while interlocking with a crank shaft;

• a rotor having a plurality of vanes, each vane forming an advance chamber in a direction of adjusting an advance phase angle and a retard chamber in a direction of adjusting a retard phase angle, and each vane mounted at the inner space of the housing while being interlocked with a cam shaft;
• and a locking pin member including a hollow outer pin elastically mounted at a locking chamber formed at the vane, and an inner pin elastically mounted at an inside of the outer pin, and preventing rotation of the rotor by being coupled to the housing while adjusting a valve timing, the method comprising:
• discharging working fluid of the advance chamber, the retard chamber, and the locking chamber when the engine is in a stationary state;
• supplying the working fluid to the advance chamber and the retard chamber and discharging the working fluid of the locking chamber during an idling rotation state of the engine;
• providing a torque by being transmitted from the cam shaft;
• and
• supplying the working fluid to the locking chamber and selectively supplying the working fluid to the advance chamber or to the retard chamber during a normal engine operational state.