Lubrication structure of planetary gear set utilizing inner pipe

Patent metadata

Field	Value
Publication number	US-11879540-B2
Application number	US-202217724844-A
Country	US
Kind code	B2
Filing date	Apr 20, 2022
Priority date	Dec 1, 2021
Publication date	Jan 23, 2024
Grant date	Jan 23, 2024

Abstract

A lubrication structure of a planetary gear set includes a hollow shaft on which the planetary gear set is disposed and forming an oil passage in an axial direction thereof and a plurality of oil holes in a radial direction thereof to supply a lubrication oil to the planetary gear set, and an internal pipe provided within the oil passage of the hollow shaft, wherein a gap chamber is formed between the internal pipe and the hollow shaft with a preset gap, where a plurality of oil supply holes are formed through the internal pipe in the radial direction to fluidically communicate the gap chamber and an internal space of the internal pipe.

First claim

What is claimed is:

1. A lubrication structure of a planetary gear set, the lubrication structure comprising:
a hollow shaft on which the planetary gear set is disposed and forming an oil passage in an axial direction thereof, wherein the hollow shaft includes a plurality of oil holes in a radial direction thereof to supply a lubrication oil to the planetary gear set therethrough; and
an internal pipe provided within the oil passage of the hollow shaft, wherein a gap chamber is formed between the internal pipe and the hollow shaft with a preset gap,
wherein a plurality of oil supply holes are formed through the internal pipe in the radial direction to fluidically communicate the gap chamber and an internal space of the internal pipe,
wherein the internal pipe and the hollow shaft are fastened to each other to integrally rotate, and
wherein the internal pipe includes a through hole at an axial end portion of the internal pipe, and is fastened to a fastening hole of the hollow shaft, by a bolt which is provided to penetrate the trough hole and is engaged with the fastening hole.

2. The lubrication structure of claim 1 , wherein the hollow shaft is sealed by a cap provided on an external side of the fastening hole engaged with the bolt.

3. The lubrication structure of claim 1 , wherein a quantity of the oil supply holes formed through the internal pipe is greater than a quantity of the oil holes formed through hollow shaft.

4. The lubrication structure of claim 1 , wherein the preset gap is smaller than a diameter of each of the oil holes.

5. The lubrication structure of claim 1 , wherein the lubrication oil supplied to the oil passage is supplied to the planetary gear set through the oil supply holes and the gap chamber and the oil holes.

6. A lubrication structure of a planetary gear set, the lubrication structure comprising:
a hollow shaft on which the planetary gear set is disposed and forming an oil passage in an axial direction thereof, wherein the hollow shaft includes a plurality of oil holes in a radial direction thereof to supply a lubrication oil to the planetary gear set therethrough, and
an internal pipe provided within the oil passage of the hollow shaft, wherein a gap chamber is formed between the internal pipe and the hollow shaft with a preset gap,
wherein a plurality of oil supply holes are formed through the internal pipe in the radial direction to fluidically communicate the gap chamber and an internal space of the internal pipe,
wherein the internal pipe and the hollow shaft are fastened to each other to integrally rotate, and
wherein the internal pipe includes a fastening hole at an axial end portion of the internal pipe, and is fastened to a through hole of the hollow shaft, by a bolt which is provided to penetrate the trough hole and is engaged with the fastening hole.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Ahn Chulmin
• Kim Baekyu
• Byun Sunggon
• Kim Yohan
• Maeng Su Hyeon
• Cheon Dong Hui
• Kim Jieun
• Kwon Sun Sung
• Ha Junyoung

Classifications

• F16H57/043 Primary

  within rotary parts, e.g. axial channels or radial openings in shafts · CPC title

• F16H57/0486

  with fixed gear ratio  (axle or inter-axle differentials F16H57/0483) · CPC title

• F16H57/0482 Primary

  Gearings with gears having orbital motion · CPC title

• F16H57/0479

  Gears or bearings on planet carriers · CPC title

• B60K2001/001

  one motor mounted on a propulsion axle for rotating right and left wheels of this axle · CPC title