Zf Friedrichshafen Ag

Juergen Legner

Migen Bebeti

Rico Gloeckner

Jan Doering

A drive for a work machine includes a computer configured to control a first electric motor for driving vehicle wheels and a second electric motor for driving a work attachment. The computer is configured to process signals which correspond to control of a movement of a lifting mechanism of the work attachment or a bucket of the work attachment. The computer is further configured to process a signal which corresponds to a position of an accelerator pedal. The first electric motor and the second electric motor are configured to be controlled separately from each another, and control of the second electric motor takes place according to the control of the movement of the work attachment.

Drive for a machine

A drive for a machine includes a computer configured to control a first electric motor for driving vehicle wheels and a second electric motor for driving a work attachment. The second electric motor is configured to drive at least one hydraulic pump with an adjustable stroke volume. A sensor is configured to detect the stroke volume of the pump. The computer processes the stroke volume to control the second electric motor.

A propulsion drive system for a mobile machine includes an electric motor having a first range, in which a torque is constant as a rotational speed rises, and a second range, in which a power is constant as the rotational speed rises. The propulsion drive system further includes a transmission operatively connected mechanically to the electric motor. The propulsion drive system is configured to be transferred, via the transmission, from a state for relatively low driving speeds into a state for relatively high driving speeds of the mobile machine. The electric motor and the transmission are adapted to one another in such a way that the electric motor can be operated in the state for relatively low driving speeds exclusively in the first and second range.

Propulsion drive system for mobile machine

A device for actuating a frictional converter lock-up clutch of a hydrodynamic torque converter. A piston of the lock-up clutch can be acted upon by pressure of a inner chamber of a converter that acts in the engaging direction of the lock-up clutch and by pressure of a piston chamber delimited by the piston that acts in the disengaging direction. At least in the disengaging operating condition of the lock-up clutch, the piston space is connected to the inner chamber of the converter. The inner chamber can be supplied with hydraulic fluid via a first line. Hydraulic fluid can be discharged from the inner chamber via a second line. The piston chamber of the lock-up clutch can be connected to a pressurized zone and to an essentially unpressurized zone. By varying the pressure in the piston chamber, the device can modulate the transmission capacity of the lock-up clutch.

Growing community of inventors

Friedrichshafen, Germany

Juergen Legner