Planetary gear transmission apparatus
US6348022B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Apr 28, 2000 |
| Grant date | Feb 19, 2002 |
| Priority date | — |
| Expiry date | Apr 28, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2001/2881
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A planetary gear transmission apparatus includes a sun gear, a first inner gear ring, a second inner gear ring and a planetary gear set constitutes a plurality of planetary gears. The first inner gear ring has increased tooth space, increased tooth root and decreased tooth thickness. The second inner gear ring has decreased tooth space, decreased tooth root and increased tooth thickness. The first and second inner gear rings have substantially same size of tooth root circles. The planetary gear is cylindrical formed with an uniform diameter. The rotational contact surfaces between the components are curved plane contact. The apparatus may be made small size at a low cost and with no stress concentration. Friction loss is less. Transmission efficiency may be increased without overheating at high rotation speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.