Control valve for valve timing adjusting device of internal combustion engine

1. A hydraulic control valve for a valve timing adjusting device of an internal combustion engine to selectively supply working fluid to or discharge from the valve timing adjusting device having a housing having an inner space, a rotor installed in the inner space of the housing and configured to work in cooperation with a camshaft, the rotor having a plurality of vanes 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, respectively, and a locking pin member elastically installed at a locking chamber formed at the plurality of vanes to adjust a valve timing in a middle position between a most advance position and a most retard position of the rotor to inhibit or prevent a relative rotation of the rotor to the housing, the hydraulic control valve comprising:

a valve body connected to the camshaft and having a plurality of ports and a spool space formed therein;

an outer spool elastically installed in the spool space of the valve body and having a plurality of distribution ports formed through an exterior circumference thereof to be selectively communicated with or disconnected to the plurality of ports of the valve body;

an inner spool integrally coupled at an inside of the outer spool and configured to form a supply passage connected to a working fluid pump and a drain passage connected to a drain tank together with the outer spool, respectively;

wherein the rotor comprises:

an advance fluid passage configured to communicate with the advance chamber,

a retard fluid passage configured to communicate with the retard chamber, and

a locking fluid passage configured to communicate with the locking chamber;

an inflow port to which working fluid is supplied;

an advance port configured to communicate with the advance fluid passage;

a retard port configured to communicate with the retard fluid passage;

a locking port configured to communicate with the locking fluid passage; and

a discharge port configured to discharge the working fluid, and

wherein the hydraulic control valve forms a 5-port 5-position solenoid valve configured to select from a self-locking state to a filling state, an advance control state, a holding state, and a retard control state sequentially based on a movement of the spool against an elastic force of a spring arranged between an inner wall of the spool space and at least one of the inner spool or the outer spool.

2. The hydraulic control valve of claim 1 , wherein the locking port of the valve body is arranged between the advance port and the retard port.

3. The hydraulic control valve of claim 1 , wherein the plurality of distribution ports of the outer spool comprises:

a first distribution port configured to be connected or disconnected to the advance port of the valve body;

a second distribution port configured to be connected or disconnected to the retard port of the valve body; and

a third distribution port configured to be connected or disconnected to the locking port of the valve body.

4. The hydraulic control valve of claim 3 , wherein the first distribution port and the second distribution port are disposed on a first side and a second side of the third distribution port, respectively.

5. The hydraulic control valve of claim 1 , wherein the outer spool and the inner spool form a spool of one body, and a spring is arranged between the spool of one body and an inner wall of the spool space.

6. The hydraulic control valve of claim 1 , wherein a stopper configured to limit a movement of the spool is further provided at one end portion of the valve body.

7. The hydraulic control valve of claim 1 , wherein a check valve is further provided at a working fluid inflow port of the valve body.

8. The hydraulic control valve of claim 1 , wherein a bias spring is provided at one end portion of the valve body and is configured to apply elastic force to the camshaft.