Control valve used in valve timing control device for internal combustion engine and valve timing control system for internal combustion engine

An internal combustion engine valve timing control system comprising:

• a housing to which a torque is transmitted from a crankshaft;
• a vane rotor disposed inside the housing and including a vane dividing an internal space of the housing into a first hydraulic chamber and a second hydraulic chamber;
• a valve body being tubular, fixing the vane rotor to a camshaft, and including a first port, a second port, a supply passage, and a drain passage, wherein the first port communicates with the first hydraulic chamber, wherein the second port communicates with the second hydraulic chamber, wherein the supply passage is structured to communicate with an external oil supply part, and wherein the drain passage is structured to communicate with an external drain space;
• a sleeve disposed inside the valve body and defining a first sleeve oil passage inside the sleeve, wherein the first sleeve oil passage is structured to communicate with the external oil supply part;
• a spool valve being tubular, disposed between the valve body and the sleeve, structured to travel in a longitudinal direction of the valve body, and including a first spool oil passage and a second spool oil passage, wherein the first spool oil passage and the second spool oil passage each extend radially through the spool valve;
• a check valve mounted to the spool valve and structured to allow a flow of working oil from a first end of the first spool oil passage to a second end of the first spool oil passage and restrict a flow of working oil from the second end to the first end;
• and
• a biasing member disposed inside the valve body and structured to bias the spool valve toward a first side in the longitudinal direction;
• wherein
• the spool valve is structured to be assembled in a first state and in a second state;
• when in the first state:
• the spool valve is disposed such that the second spool oil passage is closer to a second side opposite to the first side in the longitudinal direction than the first spool oil passage;
• and
• as the spool valve has traveled toward the second side in the longitudinal direction against a biasing force of the biasing member, the first port communicates with the second port via the first spool oil passage, the first sleeve oil passage, and the second spool oil passage;
• and
• when in the second state:
• the spool valve is disposed such that the first spool oil passage is closer to the second side in the longitudinal direction than the second spool oil passage;
• and
• as the spool valve has traveled toward the first side in the longitudinal direction, the first port communicates with the second port via the first spool oil passage, the first sleeve oil passage, and the second spool oil passage.