Planetary gear mechanism
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTakeshi Matsumoto, Masanori Sakai, Yoshito Sekiguchi, Jun Kamitake, Takeyoshi Horibe
Life of this patent
Estimating the term…
Abstract
A planetary gear mechanism including a plurality of pinion gears held rotatably and revolvably, and a ring gear meshing with the plurality of pinion gears, wherein the ring gear includes a plurality of low rigidity portions (through holes) having a small section modulus in a radial direction of the ring gear at predetermined intervals in a circumferential direction of the ring gear, and the plurality of teeth of the ring gear include a thermally-treated distortion portion (gear portion) in which an accumulated pitch error based on thermal treatment fluctuates.
Claims5
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.
Dependencies are inferred from the claim text.