Driving hub for a vehicle, particularly a bicycle, with an infinitely adjustable transmission ratio
US5318486A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 14, 1992 |
| Grant date | Jun 7, 1994 |
| Priority date | — |
| Expiry date | Aug 14, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2037/0866
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The drive hub for a vehicle, particularly for a bicycle, includes a hub axle 1, a hub shell 9 rotatable relative thereto, and a driver or actuator 13 mounted on the hub axle 1. The driver 13 drives the hub shell 9 over a ball friction gear 17, the ball carrier plates 25 and 27 of which form with the hub axle 1 a rigid gear housing the balls 35 of which, with a guide ring 33, a drive ring 51 and a driven ring 55, enter into a frictional connection which, by the swivelling of the axle pins 37 between drive ring 51 and driven ring 55, permits different rotational speeds. The pressure forces are produced by a thread 47 between driver 13 and drive sleeve 49 proportionally to the driving torque, the pressure spring 57 ensuring a dead-travel-free response of the ball friction gear 17. The infinitely variably adjustable transmission ratio of the ball friction gear 17 is controlled through a control device 79 consisting of rotational elements, through a solid cone 29 which sets in rotation a crank wheel 91, as a result of which the spiral-shaped guide grooves 95 move the ball projections 39 of the ball axles 37 radially outwards or inwards, depending upon the direction of rotation. The ball…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.