Accession Number : ADD005918

Title :   Hydraulic Control for Hydromechanical Transmission.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON D C

Personal Author(s) : Northup,Robert Powers

Report Date : 05 Sep 1978

Pagination or Media Count : 11

Abstract : A power transmission that includes hydraulically-operated clutches that are selectively supplied with operating fluids by a selector valve that is controlled by an error signal means constructed to compare prime mover speed and user demand speed. The transmission preferably is a split torque hydromechanical transmission having one power path going through a hydrostatic pump-motor unit and another path going only through epicycloidal gearing system containing the hydraulically-operated clutches. The transmission is controlled hydraulically rather than mechanically, thereby avoiding problems relating to mechanical slack, response lag, and reliability. (Author)

Descriptors :   *Patents, *Transmissions(Mechanical), *Hydromechanics, *Hydraulic valves, Control systems, Clutches, Hydraulic equipment, Ground vehicles

Subject Categories : Surface Transportation and Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE