Automatic speed reducing ratio-switching apparatus
US7510495B2 · kind B2 · utility
2Cited by
12References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 18, 2006 |
| Grant date | Mar 31, 2009 |
| Priority date | — |
| Expiry date | Sep 18, 2027 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H3/54
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Helical gears, which are provided for a sun gear, planet gears, and an internal gear, have helix angles θ of not less than 25 degrees and not more than 45 degrees. Pawls provided for lock sections and internal gear lock receiving sections of the internal gear have rising angles γ, respectively, that satisfy the relational expression, 0 ≦tan γ<(η·di)/{dp·tan(90−α)}, wherein α is the helix angle of the sun gear, η is the screw efficiency of the sun gear as a sliding screw, dp is the pitch circle diameter of the sun gear, and di is an outer diameter of the internal gear defining a center of application of torque of the pawls.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.