Two-array planetary gear system with flexpins and helical gearing
US8814746B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 13, 2011 |
| Grant date | Aug 26, 2014 |
| Priority date | — |
| Expiry date | Sep 3, 2031 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2001/289
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A planetary gear system (P) includes a sun gear (2), a ring gear (4) a carrier (6) located between the sun and ring gears (2, 4), and planet pinions (8, 10) organized in two arrays and supported on flexpin assemblies (32, 34) in the carrier (6). All of the gearing is helical, with the sun and ring gears (2, 4) having their teeth arranged in at double helix angles (herringbone) and the planet gears (8, 10) at single helix angles. The pinions (8) of the one array engage the teeth of one angle on the sun and ring gears (2, 4) and the pinions (10) of the other array engage the teeth of the other angle on the sun and ring gears (2, 4). Torque transfers through the carrier (6) through two torque paths (a, b)—one to the flexpin assemblies (32) for one array and the other to the flexpin assemblies (34) of the other array—and the paths (a) is stiffer than the path (b). Owing to the helical cut of the teeth the planet pinions (8, 10) of the two arrays exert oppositely directed axial forces (A) on the sun gear (2). The sun gear (2) is free to shift axially or float with respect to the planet pinions (8, 10) of the two arrays, so the axial forces (A) imparted to the sun gear, while opposite, a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.