US 11,885,103 B2
Power system for a working machine and corresponding operation method
Karl Uebel, Kvicksund (SE); Per Mattsson, Sölvesborg (SE); and Daniel Stålberg, Eskilstuna (SE)
Assigned to VOLVO CONSTRUCTION EQUIPMENT AB, Eskilstuna (SE)
Appl. No. 17/923,368
Filed by Volvo Construction Equipment AB, Eskilstuna (SE)
PCT Filed May 4, 2020, PCT No. PCT/EP2020/062286
§ 371(c)(1), (2) Date Nov. 4, 2022,
PCT Pub. No. WO2021/223837, PCT Pub. Date Nov. 11, 2021.
Prior Publication US 2023/0135081 A1, May 4, 2023
Int. Cl. E02F 9/20 (2006.01); E02F 9/22 (2006.01)
CPC E02F 9/2075 (2013.01) [E02F 9/202 (2013.01); E02F 9/2091 (2013.01); E02F 9/2217 (2013.01); E02F 9/2292 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A power system for a working machine, comprising:
a prime mover and a main shaft, wherein the prime mover is drivingly connectable to the main shaft;
a planetary gear set comprising a rotatable first member drivingly connected to the main shaft, a rotatable second member and a rotatable third member for propulsion of the working machine;
a hydraulic system comprising at least one hydraulic actuator for performing a working function of the working machine during use of the working machine;
an electric energy storage system;
a first hydraulic machine mechanically coupled to the main shaft and hydraulically coupled to the hydraulic system;
a first electric machine mechanically coupled to the main shaft;
a second electric machine mechanically coupled to the rotatable second member, wherein the first and second electric machines are electrically connected and wherein the electric energy storage system is electrically connected to the first and second electric machines, and wherein the power system further comprises:
a second hydraulic machine mechanically coupled to the rotatable second member and hydraulically coupled to the hydraulic system, wherein the second hydraulic machine is configured such that it can be operated in two opposite rotational directions in order to generate hydraulic power to the hydraulic system.