Compressed air-operated motor employing dual lobe cams

In an engine system for driving a vehicle, a compressed air storage tank, an engine provided with a plurality of cylinders containing pistons and a crankshaft having crank elements connected to said pistons, compressed air supply conduit means connecting said storage tank to the cylinders and including respective intake valves controlling admission of compressed air to the cylinders for generating power strokes, exhaust conduit means connected to the cylinders and including respective exhaust valves controlling discharge of expanded air from the cylinders, camshaft means drivingly coupled with the crankshaft, said camshaft means including a plurality of dual-lobed cams, and respective follower means engaging said cams and being operatively coupled to said intake and exhaust valves, said cams and follower means being arranged to open the intake valves shortly after the pistons pass their extended dead center positions in the cylinders to generate the power strokes, and to open the exhaust valves shortly before the pistons reach their retracted dead center positions in the cylinders at the ends of said power strokes.