Abstract: A hydraulic power transmission apparatus having improved valving for accurately regulating the flow of hydraulic material between a pair of cylinders in either of two opposite directions. The valve has a circularly cylindrical occluding member disposed in occluding position within the hydraulic material pathway connecting the two cylinders to separate the pathway into separate first and second sides. The occluding member seats loosely within a plurality of arcuate seating surfaces and is displaceable upon change in direction of flow of the hydraulic material, under the influence of the hydraulic material, from a first position in abutment with a first plurality of seating surfaces to a second position in abutment with a second plurality of seating surfaces. The occluding member is freely rotatable about its longitudinal axis within the seating surfaces and has at least one slot formed therein.

Abstract: A transmission wherein power is transmitted between a camshaft and a rotating cylinder block through a pair of pistons reciprocally and slidably disposed within a pair of adjacent cylinders in the cylinder block. In one mode of operation, the transmission provides a direction connection between the camshaft and the cylinder block. In this mode of operation, the pistons are prevented from moving relative to the cylinder block and accordingly rotate therewith, and the camshaft and the cylinder block rotate at the same velocity. In a second mode of operation, the relative speeds of the camshaft and the cylinder block are varied with respect to one another, and the pistons are driven in reciprocating movement 180.degree. out of phase with one another by a pair of cams disposed eccentrically on the camshaft and fixed thereto.

Abstract: An internal combustion engine is disclosed having opposed, axially aligned, annular reciprocating and rotatable pistons connected through radially disposed crankshafts to a drive shaft which extends coaxially of the opposed pistons. The crankshafts are so supported to permit rotation about the axis of the drive shaft when a clamping brake is released, as during an idle condition. Planetary cam plates are rotated by and in timed relation to the crankshafts and serve to control valve and ignition operation for four cycle operation.