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Planetary gearset with multi-layer coated sun gear

A technology for planetary gear sets and sun gears, applied to elements with teeth, gear lubrication/cooling, belts/chains/gears, etc., can solve damage to driving or driven devices, planetary gear set fatigue wear, gear failure, etc. problem, achieve the effect of improving lubrication conditions and uniform stress distribution

Inactive Publication Date: 2005-10-05
GENERAL MOTORS COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This stress can lead to excessive fatigue wear of planetary gear sets, premature failure of gears, and damage to drive or driven gear

Method used

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  • Planetary gearset with multi-layer coated sun gear
  • Planetary gearset with multi-layer coated sun gear
  • Planetary gearset with multi-layer coated sun gear

Examples

Experimental program
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Embodiment Construction

[0023] now refer to figure 1 , the planetary gear set is generally represented by 10. Gearset 10 includes a sun gear member 12 , a number of planetary gear members 14 and a ring gear member 16 . The sun gear member 12, the planet gear members 14 and the ring gear member 16 are preferably made of a steel material. The sun gear member 12 has a central opening 18 for connection to a drive shaft (not shown), such as the drive shaft (not shown) of an automotive automatic transmission. Each planet gear 14 is connected to an associated shaft 19 by a bearing (not shown) extending from its axis of rotation, and a number of teeth 20 are formed on the outer circumference of the planet gear. Each tooth 20 of the planetary gear 14 includes a mating surface 22 that engages a corresponding mating surface (not shown) of a number of teeth 24 on the inner surface of the ring gear 16 .

[0024] The sun gear member 12 includes a sun gear body 26 having a number of teeth 28 formed on its outer ...

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Abstract

A planetary gearset includes a sun gear member having a sun gear body made of a steel material and an outer periphery with a plurality of teeth formed thereon. Each of the sun gear teeth has at least one mating surface for engaging mating surfaces on complementary teeth on at least one planet gear. A fatigue-resistant coating is applied to the mating surfaces of the sun gear teeth. The coating is harder and more abrasive than the mating surfaces of the planet gear teeth.

Description

technical field [0001] The present invention relates generally to gears and planetary gear sets, and more particularly to a planetary gear set having a multi-layer coated sun gear. Background technique [0002] It is well known that, in order to drive rotating machines, gears are used to transmit torque from one rotating shaft to another through the meshing of their teeth. A plurality of interconnected gears is known in the art as a gear set. A typical planetary gear set includes a sun gear member, a number of planet gear members supported by a carrier member, and a ring gear member. [0003] In an automotive planetary gear set, the sun gear element is usually connected to and driven in rotation by a drive shaft. The outer circumference of the sun gear includes several gear teeth formed thereon. The teeth of each sun gear include mating surfaces which engage corresponding mating surfaces of the teeth of the plurality of planet gears. The teeth on the planet gears also me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H55/06F16H57/04
CPCF16H57/041F16H55/06Y10S475/901F16H57/0482Y10T29/49464
Inventor L·C·莱夫郑仰泽N·E·安德森A·M·维纳R·F·帕卢奇
Owner GENERAL MOTORS COMPANY
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