US 12,312,769 B2
Hybrid system and working machine including hybrid system
Sumio Yagyu, Sakai (JP); Yuji Hirase, Sakai (JP); Kazuto Okazaki, Sakai (JP); and Tsunehiro Ii, Sakai (JP)
Assigned to KUBOTA CORPORATION, Osaka (JP)
Filed by KUBOTA CORPORATION, Osaka (JP)
Filed on Nov. 28, 2023, as Appl. No. 18/520,713.
Claims priority of application No. 2022-190348 (JP), filed on Nov. 29, 2022.
Prior Publication US 2024/0175241 A1, May 30, 2024
Int. Cl. B60W 10/06 (2006.01); B60K 6/365 (2007.10); B60K 6/387 (2007.10); B60W 10/08 (2006.01); B60W 10/10 (2012.01); B60W 10/115 (2012.01); B60W 10/30 (2006.01); B60W 20/30 (2016.01); B60W 50/08 (2020.01); E02F 9/20 (2006.01); B60K 6/383 (2007.10)
CPC E02F 9/2075 (2013.01) [B60W 10/06 (2013.01); B60W 10/08 (2013.01); B60W 10/10 (2013.01); B60W 20/30 (2013.01); B60K 6/383 (2013.01); B60W 50/082 (2013.01); B60W 2300/17 (2013.01); B60W 2510/0208 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A hybrid system comprising:
an engine;
a generator to be driven by the engine;
an electric actuator to be driven by electricity generated by the generator;
a transmission to transmit power from the engine;
a hydraulic pump to receive power from the engine through the transmission to deliver hydraulic fluid; and
a hydraulic actuator to be driven by hydraulic fluid delivered by the hydraulic pump; wherein
the transmission includes:
a first transmission path to transmit power from the engine to the hydraulic pump when a rotational speed of the engine is a first rotational speed; and
a second transmission path to transmit power from the engine to the hydraulic pump at a speed change ratio at which a rotational speed is increased to a greater degree than at a speed change ratio of the first transmission path when the rotational speed of the engine is a second rotational speed that is lower than the first rotational speed; and
a third transmission path to transmit power from the engine to the generator;
the first transmission path and the second transmission path are connected to the third transmission path, and the generator and the hydraulic pump are connected in series to the engine;
the third transmission path includes:
a transmission assembly to transmit power from an output shaft of the engine to an input shaft of the generator, the transmission assembly being connected to the output shaft; and
a transmission shaft to transmit power from the output shaft to the first transmission path and the second transmission path, the transmission shaft being connected to the output shaft; and
the input shaft is hollow, and the transmission shaft extends through an interior of the input shaft.