Drive unit for a construction and/or material handling machine
AssigneeLiebherr-Components Biberach GmbH
InventorsKlaus Graner, Martin Paal
Life of this patent
Estimating the term…
Abstract
The invention relates to a drive unit for a construction and/or material handling machine or lifting equipment such as a crane, comprising a torque density of more than 20 Nm/l at a predetermined output speed, wherein the drive unit comprises a drive motor and a connected transmission, wherein a fast-running electric motor is provided as the drive motor, wherein the motor speed thereof is at least two times said output speed of the drive unit and is reduced by the transmission by a factor of at least 2 to the output speed of the drive unit.
Claims19
A drive unit for a construction and/or material handling machine or lifting equipment such as a crane, the drive unit comprising:
- a torque density of more than 20 Nm/l at a predetermined output speed, wherein the drive unit comprises a drive motor and a connected transmission, wherein the drive motor comprises an electric motor having a motor speed that is at least two times the predetermined output speed of the drive unit and that is reduced by the connected transmission by a factor of at least 2 to an output speed of the drive unit, and
- wherein the coolant circuit has an inlet at a transmission-side end portion of the electric motor and a coolant outlet at an end portion of the electric motor facing away from the connected transmission.
A drive unit for a construction and/or material handling machine or lifting equipment such as a crane, the drive unit comprising:
- a torque density of more than 20 Nm/l at a predetermined output speed, wherein the drive unit comprises a drive motor and a connected transmission, wherein the drive motor comprises an electric motor having a motor speed that is at least two times the predetermined output speed of the drive unit and that is reduced by the connected transmission by a factor of at least 2 to an output speed of the drive unit, wherein the connected transmission comprises a coaxial transmission stage;
- and
- an upright planet carrier fixedly connected to a motor and/or transmission housing, and wherein the upright carrier carries a pivot bearing for a transmission input shaft and/or a motor shaft.
A method for using a drive unit for replacement with a hydraulic drive for driving a machine unit of a construction and/or material handling machine or lifting equipment, wherein the drive unit comprises:
- a torque density of more than 20 Nm/l at a predetermined output speed, wherein the drive unit comprises a drive motor and a connected transmission, wherein the drive motor comprises an electric motor having a motor speed that is at least two times the predetermined output speed of the drive unit and that is reduced by the connected transmission by a factor of at least 2 to an output speed of the drive unit.
A drive set comprising a drive unit and a hydraulic drive, wherein the drive unit and the hydraulic drive have corresponding connection flanges and have torque densities that differ from each other by less than 50%, and wherein the drive unit comprises:
- a torque density of more than 20 Nm/l at a predetermined output speed, wherein the drive unit comprises a drive motor and a connected transmission, wherein the drive motor comprises an electric motor having a motor speed that is at least two times the predetermined output speed of the drive unit and that is reduced by the connected transmission by a factor of at least 2 to an output speed of the drive unit.
Dependencies are inferred from the claim text.