US 12,467,518 B1
Planetary gear mechanism
Takeshi Matsumoto, Toyota (JP); Masanori Sakai, Nagoya (JP); Yoshito Sekiguchi, Kariya (JP); Jun Kamitake, Toyota (JP); and Takeyoshi Horibe, Hekinan (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Mar. 7, 2025, as Appl. No. 19/073,705.
Claims priority of application No. 2024-126500 (JP), filed on Aug. 2, 2024.
Int. Cl. F16H 1/48 (2006.01)
CPC F16H 1/48 (2013.01) 5 Claims
OG exemplary drawing
 
1. A planetary gear mechanism, comprising: a plurality of pinion gears that is held rotatably and revolvably; and an object gear that meshes with the pinion gears, wherein
the object gear includes a plurality of low rigidity portions, in which a section modulus in a radial direction of the object gear is small, at predetermined intervals in a circumferential direction of the object gear,
a plurality of teeth of the object gear includes a thermally-treated distortion portion in which an accumulated pitch error based on thermal treatment was changed,
the object gear includes a base portion and a gear portion that is fashioned on an outer peripheral face or an inner peripheral face of the base portion, and
the low rigidity portions include a groove that is fashioned on one face out of the outer peripheral face and the inner peripheral face of the base portion that is a face on an opposite side from the gear portion.