Planetary gear transmission
US5295925A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 18, 1992 |
| Grant date | Mar 22, 1994 |
| Priority date | — |
| Expiry date | Nov 18, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H1/46
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A two-stage planetary gear transmission having a first-stage planetary gear transmission and a second-stage planetary gear transmission is disclosed, wherein the carrier of the second-stage planetary gear transmission comprises first and second carrier parts integrally connected with each other. A hollow pinion shaft formed thereon with the sun gear of the second stage is rotationally supported on the first carrier part via a deep-channel ball bearing in a cantilevered condition. A carrier of the first stage for supporting planetary gears of the first stage is integrally formed on the end of the hollow pinion shaft of the second stage. A lubricant layer of about 15 .mu.m to about 20 .mu.m in width is formed between an inner race member of a planetary bearing and a planetary shaft for each of the planetary gears of the second stage. In addition, the gear ratio u1 of the first-stage planetary gear transmission is larger than the gear ratio u2 of the second-stage planetary gear transmission, and which is equal to or larger than about 5. According to the present invention, misalignment or improper meshing of the gears of the first stage can be adjusted by movement of the cantilevered p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.