US 12,123,484 B2
Power transmission device
Shin Kurosaki, Toki (JP); and Hiroki Monji, Toyota (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Nov. 8, 2023, as Appl. No. 18/504,458.
Claims priority of application No. 2023-016149 (JP), filed on Feb. 6, 2023.
Prior Publication US 2024/0263691 A1, Aug. 8, 2024
Int. Cl. F16H 37/08 (2006.01); F16H 48/08 (2006.01); F16H 48/10 (2012.01); F16H 57/037 (2012.01); B60K 6/365 (2007.10); B60K 7/00 (2006.01); B60K 17/16 (2006.01); F16H 48/06 (2006.01); F16H 57/02 (2012.01)
CPC F16H 37/082 (2013.01) [F16H 48/08 (2013.01); F16H 48/10 (2013.01); F16H 57/037 (2013.01); B60K 6/365 (2013.01); B60K 2007/0092 (2013.01); B60K 17/16 (2013.01); F16H 48/06 (2013.01); F16H 2048/085 (2013.01); F16H 2048/087 (2013.01); F16H 2057/02034 (2013.01); F16H 2057/02052 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A power transmission device comprising a speed reducer and a differential, wherein:
the speed reducer includes
a hollow input shaft,
a sun gear provided at one end of the input shaft,
a plurality of stepped pinions disposed to surround the sun gear, the stepped pinions each including an input gear with a first number of teeth and an output gear with a second number of teeth different from the first number of teeth, and the input gear being engaged with the sun gear,
a first ring gear fixed to a housing of the speed reducer and engaged with the input gear of each of the stepped pinions, and
a second ring gear engaged with the output gear of each of the stepped pinions;
the differential includes
a differential housing fixed to the second ring gear,
a first output shaft and a second output shaft that are disposed coaxially with the input shaft and extend in opposite directions from each other from the differential housing, with one of the first output shaft and the second output shaft passing through an inside of the input shaft,
a first side gear fixed to the first output shaft in the differential housing,
a second side gear fixed to the second output shaft in the differential housing,
a first differential pinion gear rotatably supported by the differential housing around an axis parallel to the input shaft and engaged with the first side gear, and
a second differential pinion gear rotatably supported by the differential housing around an axis parallel to the input shaft and engaged with the second side gear and the first differential pinion gear;
the differential housing is positioned such that the differential housing is surrounded by the output gears of the stepped pinions;
the differential housing includes a boss that protrudes concentrically with the input shaft; and
the boss is located inside the sun gear.