Abstract: A hydraulic auxiliary power system (248) for a vehicle includes a hydraulic pump (28). An auxiliary drive motor (56?) receives hydraulic fluid from the hydraulic pump (28). An electrical current generating device (252) is coupled to the auxiliary drive motor (56?) and powers one or more mechanically or electrically operated devices (254). A powertrain system (10??) includes an engine (12) and the hydraulic pump (28). A drivetrain hydraulic motor (30) receives hydraulic fluid from the hydraulic pump (28). The drivetrain motor (30) supplies energy for translation of the vehicle in response to the received hydraulic fluid. The auxiliary drive motor (56?) is in fluid operation with the hydraulic pump (28) and supplies energy to one or more of the mechanically or electrically powered devices (254).

Abstract: A hydraulic powertrain system (300) for a vehicle includes an engine (12) and a hydraulic pump (28). A hydraulic wheel motor (306) is coupled to and receives a hydraulic fluid from the hydraulic pump (28). The hydraulic wheel motor (306) is coupled to a single wheel (24) of the vehicle. The wheel motor (306) includes a first hydraulic motor that is coupled to the hydraulic pump (28) and a second hydraulic motor that is ganged to the first motor. The wheel motor (306) supplies energy for translation of the vehicle in response to the received hydraulic fluid. The hydraulic powertrain system may include the hydraulic pump (28) and the hydraulic wheel motors (306, 308). A single hydraulic valve assembly (304) allows selected portions of the hydraulic fluid to be received by the wheel motors (306, 308). A hydraulic powertrain system (330) includes multiple hydraulic motors (30, 336) that are coupled to multiple driveshafts (16, 338). The driveshafts (16, 338) rotate wheels (24, 26, 346, and 348) of the vehicle.

Abstract: A non-high-pressure accumulator based powertrain system for a vehicle includes an engine (12). A hydraulic pump (28) is coupled to the engine (12). A hydraulic motor (30) is coupled to and receives hydraulic fluid from the hydraulic pump (28) and not from an accumulator. The hydraulic motor (30) supplies energy for translation of the vehicle in response to the received hydraulic fluid. Another powertrain system includes the engine (12), the hydraulic pump (28), and multiple hydraulic motors (30). The hydraulic motors (30) include a first hydraulic motor and a second hydraulic motor that are ganged together and timed relative to each other. Yet another powertrain system also includes the engine (12), the main hydraulic pump (28), and the hydraulic motor (30). A charge pump (52) supplies control pressure to the main hydraulic pump (28) and the hydraulic motor (30).