US 12,013,023 B2
Drive unit for a construction and/or material handling machine
Klaus Graner, Biberach an der Riss (DE); and Martin Paal, Biberach an der Riss (DE)
Assigned to Liebherr-Components Biberach GmbH, Biberach an der Riss (DE)
Filed by Liebherr-Components Biberach GmbH, Biberach an der Riss (DE)
Filed on Nov. 3, 2022, as Appl. No. 18/052,356.
Application 18/052,356 is a continuation of application No. PCT/EP2021/061047, filed on Apr. 28, 2021.
Claims priority of application No. 10 2020 112 258.6 (DE), filed on May 6, 2020; and application No. 10 2020 116 762.8 (DE), filed on Jun. 25, 2020.
Prior Publication US 2023/0151882 A1, May 18, 2023
Int. Cl. F16H 57/04 (2010.01); F16H 57/025 (2012.01); F16H 1/28 (2006.01); F16H 57/02 (2012.01)
CPC F16H 57/025 (2013.01) [F16H 57/0412 (2013.01); F16H 57/0476 (2013.01); F16H 1/28 (2013.01); F16H 2057/02034 (2013.01); F16H 2057/02073 (2013.01); F16H 57/0486 (2013.01)] 19 Claims
OG exemplary drawing
 
1. 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.