Abstract: A two cycle engine comprises an engine casing that defines a hollow piston cavity, a first gas passageway and a second gas passageway. The hollow piston cavity is separated from the first gas passageway by a valve seat. A piston is positioned in the hollow piston cavity and is moveable between a top position in which the second gas passageway is blocked to the hollow piston cavity, and a bottom position in which the second gas passageway is open to the hollow piston cavity. A gas valve member is positioned adjacent the valve seat and is moveable between an open position and a closed position relative to the valve seat. The gas valve member defines a nozzle outlet that opens directly into the hollow piston cavity. A needle valve member is positioned in the gas valve member and is moveable between an inject position in which the nozzle outlet is open, and a blocked position in which the nozzle outlet is blocked.

Abstract: A drive system for a vehicle having a set of front wheels and a set of rear wheels drivable from a source of power includes a transfer case having first and second operating states, a front drive mechanism having corresponding first and second operating states and a control system which can be actuated to change the operating mode of the vehicle drive system between a two-wheel drive mode and a four-wheel drive mode by changing the operating states of the transfer case and the drive assembly in proper sequence. The transfer case includes a conventional interaxle differential to permit general vehicle operation in the four-wheel drive mode. The transfer case also includes a chain and sprocket assembly which can be selectively engaged to control the transfer of drive torque to the front wheels. The engagement of the chain and sprocket assembly is controlled by a shiftable clutch collar within the transfer case.

Abstract: A transfer case for four wheel drive vehicles having a housing made up of two identical, complementary castings. The castings are secured together in opposed, complementary relationship to define a compartment for the mechanism for transmitting power to the front and rear axles of the vehicle. The castings are of identical construction to provide a compact housing and reduced manufacturing costs because of the interchangeability of the two castings making up the housing. The castings are formed to support a variety of transmission mechanisms. In one such arrangement disclosed, a dual range transmission is provided including parallel chain and gear train transmissions from the power shaft to the output shafts to the front and rear axles of the vehicle. The opposed end walls of the housing defined by the two complementary castings are formed with supporting structure for the power shaft from the engine, a counter shaft for the gear train transmission, and the output shafts for driving the front and rear axles.