Zf Friedrichshafen Ag

Robert Morrison

Marcus Hiemer

Michael Siber

Roland Fischer

Jürgen Legner

Sven Bieber

Stephan Schinacher

Rico Glöckner

Jan-Frederik Kuhn

Stefan Traub

Vladimir Muhlbach

Andreas Weber

Vladimir Mühlbach

A process for determining a setpoint rotational speed of a work machine engine, having a continuously variable transmission, based on operation of power hydraulics. The setpoint rotational speed for highly productive operation is determined, without knowledge current operation of the power hydraulics, by a basic engine speed setting. With knowledge of the current operating state, the setpoint rotational speed is determined by the basic speed settings and low or high engine speed settings. The low speed setting alone determines setpoint rotational speeds that are lower than the basic speed setting or a combination of the low and basic speed settings. The high speed setting alone determines setpoint rotational speeds that are higher than the basic speed setting or a combination of the basic and high speed settings. The speed settings can comprise a setpoint rotational speed range of above a reciprocal transmission range of the variable transmission.

Method for ascertaining the target rotational speed of a drive machine of a work machine comprising a continuously variable transmission and a working hydraulic system

A vehicle comprising an articulated joint and a sensor arranged on the articulated joint and configured to detect a lateral area of the vehicle. The sensor is configured to be swiveled in order to change a sensed area.

Vehicle having an articulated joint

A transmission device having power splitting. In the first driving range, the mechanical power branch transmits torque from the ring gear to the additional fixed gear by the fixed gear. In this case, power branches from the ring gear. The hydrostatic power branch branches from the second sun gear. The hydrostatic branch transmits power from the first to the second hydraulic unit. The first and second hydraulic units act respectively as a pump and a motor. On one of the hydrostatic shafts, the mechanical and hydrostatic powers are added and transmitted to the output. In the second driving range, power from the planet carrier partially branches to the ring gear and passes to the hydrostatic shaft for the second hydraulic unit. An auxiliary shaft can be coupled by a gear to a fixed gear operatively connected to a shaft of the power splitting device.

Transmission device having power splitting

A transmission with power branching, and the transmission, in a first drive range, transmits torque from the ring gear to a fixed wheel. In one branch, power is transmitted from a first to a second hydraulic unit which respectively operate as a pump and a motor. At one of the hydrostatic shafts, the mechanical and hydrostatic power are summed and transmitted to the drive output. In a second drive range, power coming from the planetary carrier is partially branched off to the ring gear and transmitted, via the gear wheels of the hydrostatic shaft, to the second hydraulic unit. From the second hydraulic unit, hydraulic power passes to the first hydraulic unit. In the process, the first hydraulic unit operates as a motor and the second hydraulic unit as a pump. From the second sun gear, power is transmitted to the double planetary gear and summed.

Transmission device with power splitting

A multi-gear powershift transmission for a working machine, in particular a forklift truck, which has a driveshaft () driven by a torque converter () such that, by way of fixed wheels (), loose wheels () and shift clutches () arranged on countershafts () in a first transmission, at least two forward gears and two reverse gears can be engaged. The powershift transmission can be supplemented with a further countershaft () having a fixed wheel (), a clutch () and a loose wheel () in order to produce a second powershift transmission in which three gears in the forward driving direction and three gears in the reverse driving direction are engageable.

Growing community of inventors

Tettnang, Germany

Robert Morrison