Abstract: An engine, pump or motor is disclosed of a type generally similar to the "Wankel" engine, except that the present invention is characterized by purely orbital motion of the piston to produce rotation of the output shaft. Preferably the shaft has two eccentric sections in radial alignment, the first eccentric axis being displaced from the main axis, one half the displacement of the second eccentric axis from the main axis. A pinion is rotatably mounted about the first eccentric axis. A fixed internal ring gear is fixed against rotation and mounted about the main axis so as to engage the pinion at a point in radial alignment with the two eccentric axes. An orbital ring gear is preferably identical to the fixed ring gear and rotatably mounted about the second eccentric axis so as to engage the pinion at a point on the pinion diametrically opposite the point of engagement of the pinion and the fixed ring gear. The piston is also rotatably mounted about the second eccentric axis and fixed to the orbital ring gear.

Abstract: A new filter structure is provided for removing particles from the exhaust gas of a large, single piston engine of low RPM, before passing the exhaust gas through a turbine for the purpose of driving a supercharger. The filter is so constructed as to be able to efficiently and reliably perform its filtering function over long periods of time in the high temperature environment of the piston engine exhaust. It comprises a cylindrical shaped housing having at one end longitudinally extending slits distributed around its circumference and at the other end an annular flange for mounting the filter in the exhaust line. The housing encloses a filter element comprising a hexagonal stacked array of cylindrical tubes and said filter element is retained in said housing by means of multiple resilient brackets, each formed in the shape of an open elongated loop so as to conform generally to the contour of the filter element on one hand and the inside of the housing on the other.