Egr system for rotary engine

An exhaust gas recirculation (EGR) system for a rotary engine, the EGR system comprising:

• a side housing that is located on a side of a rotor supported by an eccentric shaft and has a side exhaust port;
• a rotor housing that surrounds an outer periphery of the rotor and has a peripheral exhaust port opened at timing later than the side exhaust port;
• a side exhaust passage that is connected to the side exhaust port;
• a peripheral exhaust passage that is connected to the peripheral exhaust port;
• an EGR passage that connects the peripheral exhaust passage and an intake passage and partially recirculates exhaust gas as EGR gas to the intake passage, the exhaust gas being discharged from the peripheral exhaust port;
• and
• an EGR cooler that is located in the middle of the EGR passage and cools the EGR gas, wherein
• the EGR passage is an in-housing EGR passage that is formed inside the side housing, in the in-housing EGR passage, an opening that is opened to an outer peripheral surface of the side housing being connected to the peripheral exhaust passage, and an outlet that is opened to the outer peripheral surface of the side housing being connected to the intake passage, and
• the in-housing EGR passage is in contact with a cooling water passage provided to the side housing.