Variable valve timing system

A variable valve timing system for an engine in which a main gallery extending in a width direction of a vehicle is formed at a crankcase, the variable valve timing system comprising:

• a hydraulic variable valve device configured to change an opening and closing timing of a gas exchange valve;
• an oil control valve configured to control hydraulic pressure supplied to the variable valve device;
• an external pipe connecting the main gallery to the oil control valve;
• and
• a hydraulic pressure sensor configured to detect hydraulic pressure in an oil path formed at the crankcase, wherein:
• the oil control valve is disposed on a side surface of the engine in the width direction of the vehicle,
• a first end portion of the external pipe is connected to an end of the main gallery in the width direction of the vehicle, and
• in a bottom view of the vehicle, the first end portion of the external pipe overlaps with the crankcase, and the hydraulic pressure sensor overlaps with the crankcase adjacent to the first end portion of the external pipe in the width direction of the vehicle.