Patent ID: 8220435
Filing Date: 2012-07-17
Classification: F02B

Abstract:
1. A rotary piston engine comprising: a rotor which orbits around an output shaft axis, rotates around an eccentric shaft that is aligned in parallel to and offset from the output shaft axis, and has a generally triangular face as seen in the axial direction; a pair of side housings which are arranged at both axial sides of the rotor to be in contact with side seals of the rotor; a rotor housing which accommodates the rotor therein such that an inner surface of the rotor housing is in contact with apex seals of the rotor, the rotor, the pair of side housings and the rotor housing defining three working chambers; an injector attached to the rotor housing, and directly injecting fuel in an intake working chamber; an intake port formed in at least one of the side housings to be capable of communicating to one of the working chambers to induct air into the working chamber; an exhaust port formed in at least one of the side housings to be capable of communicating to one of the working chambers to exhaust combusted exhaust gas from the working chamber; and a pair of spark plugs installed in the rotor housing and aligned substantially in the circumferential direction of the rotor, wherein a length of one side of the triangular face of the rotor is at least 2.4 times a breadth of the rotor, and the pair of spark plugs is apart from each other by a distance of at least 0.7 times the breadth of the rotor.