Patent ID: 8584452
Filing Date: 2013-11-19
Classification: B60K,F16H,Y02T

Abstract:
1. A hydraulic transmission comprising: a) one or more fixed displacement hydraulic pump/motors mounted on a common input shaft; b) one or more fixed displacement hydraulic pump/motors mounted on a common output shaft; c) a total count of three or more pump/motors; d) hydraulic fluid pathways that connect all input pump/motors in parallel to all output pump/motors in parallel; and e) hydraulic fluid valves and pathways that allow the fluid in each pump/motor to be re-circulated directly back on itself or not; f) hydraulic controls selectively activating the hydraulic fluid valves causing any or all of the pump/motors to be deactivated by causing the hydraulic fluid to be re-circulated directly back to the deactivated pump/motor; and g) a valve that causes the flow from the input pump/motors to the output pump/motors to change direction in the output pump/motors.