Planetary gear set for power transmission apparatus

Patent metadata

Field	Value
Publication number	US-11512772-B1
Application number	US-202217748806-A
Country	US
Kind code	B1
Filing date	May 19, 2022
Priority date	Dec 8, 2021
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

A planetary gear apparatus for a power transmission apparatus including a transmission housing includes a sun gear provided on a first shaft, first and second planet carriers rotatably supporting pinion gears gear-engaged with the sun gear, and a ring gear gear-engaged with the pinion gears, where an internal circumference of the sun gear is spline-engaged with an external circumference of the first shaft, where first and second support shafts are fixed to first and second side surfaces of the ring gear, respectively, where the first support shaft is rotatably supported by a supporting frame fixed to the transmission housing, interposing a first bearing, where the second support shaft is rotatably supported by the transmission housing, interposing a second bearing, where the first planet carrier is rotatably supported by the first support shaft interposing a third bearing, and where the second planet carrier is fixedly connected to a connection end portion of a second shaft.

First claim

What is claimed is:

1. A planetary gear apparatus for a power transmission apparatus including a transmission housing, the planetary gear apparatus comprising:
a sun gear provided on an axis of a first shaft;
first and second planet carriers rotatably supporting a plurality of pinion gears gear-engaged with the sun gear; and
a ring gear gear-engaged with the plurality of pinion gears,
wherein an internal circumference of the sun gear is spline-engaged with an external circumference of the first shaft,
wherein first and second support shafts are fixed to first and second side surfaces of the ring gear, respectively,
wherein the first support shaft is rotatably supported by a supporting frame fixed to the transmission housing, a first bearing interposed between the first support shaft and the supporting frame,
wherein the second support shaft is rotatably supported by the transmission housing, a second bearing interposed between the second support shaft and the transmission housing,
wherein the first planet carrier is rotatably supported by the first support shaft, a third bearing interposed between the first planet carrier and the first support shaft, and
wherein the second planet carrier is fixedly connected to a connection end portion of a second shaft.

2. The planetary gear apparatus of claim 1 ,
wherein a first fastening hole is formed on a circumference of the first support shaft,
wherein a second fastening hole is formed on a circumference of the second support shaft,
wherein a through hole is formed on a circumference of the ring gear,
wherein the first and second support shafts are coupled to corresponding stepped surfaces formed on side surfaces of the ring gear, and
wherein the first and second support shafts are fastened to the ring gear by a fastening bolt through the first and second fastening holes and the through hole.

3. The planetary gear apparatus of claim 2 , wherein the fastening bolt is screw-engaged with the first fastening hole of the first support shaft by being inserted into the through hole of the ring gear through the second fastening hole of the second support shaft.

4. The planetary gear apparatus of claim 2 , wherein the first support shaft includes a first inner-side supporting end portion protruding axially inward and a first outer-side supporting end portion protruding axially outward, for supporting corresponding bearings.

5. The planetary gear apparatus of claim 4 ,
wherein the corresponding bearings include the third bearing, and
wherein the third bearing is provided between the first inner-side supporting end portion and an internal circumference of the first planet carrier, to rotatably support the first planet carrier.

6. The planetary gear apparatus of claim 4 ,
wherein the corresponding bearings include the first bearing, and
wherein the first bearing is provided between the first outer-side supporting end portion and the supporting frame, to be rotatably supported by the supporting frame.

7. The planetary gear apparatus of claim 2 , wherein the second support shaft includes a second outer-side supporting end portion protruding axially outward, to support the second bearing.

8. The planetary gear apparatus of claim 7 , wherein the second bearing is provided between the second outer-side supporting end portion and the transmission housing, to be rotatably supported by the transmission housing.

9. The planetary gear apparatus of claim 7 , wherein a fourth bearing is provided between an internal circumference of the second support shaft and an external circumference of the second shaft, to be rotatably supported by the second shaft.

10. The planetary gear apparatus of claim 1 ,
wherein an external gear for outputting a torque is integrally formed on an external circumference of the ring gear, and
wherein gear teeth of the ring gear and gear teeth of the external gear are formed in helical teeth having a same spiral direction.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Ahn Chulmin
• Kim Baekyu
• Byun Sunggon
• Ha Junyoung
• Cheon Donghui
• Kim Jieun
• Kim Yohan
• Kwon Sun Sung
• Maeng Suhyeon

Classifications

• F16H57/08 Primary

  of gearings with members having orbital motion · CPC title

• F16H57/021

  Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings · CPC title

• F16H1/28 Primary

  with gears having orbital motion · CPC title

• Y02T10/62

  Hybrid vehicles · CPC title

• F16H2057/085

  Bearings for orbital gears · CPC title