Planetary gear transmission systems or components – Planet pinion is friction gear – Variable speed ratio
Patent
1990-12-11
1991-12-03
Diehl, Dwight
Planetary gear transmission systems or components
Planet pinion is friction gear
Variable speed ratio
475192, F16H 372
Patent
active
050696556
ABSTRACT:
The driving hub for a vehicle, in particular a bicycle, comprises a hub shaft (1), a hub sleeve (9) which is rotatable relative to the hub shaft (1) and a driver (13) rotatably mounted on the hub shaft (1). The driver (13) drives the hub sleeve (9) via a friction gear (17) of which the first toroidal disc (25) rests rigidly on the hub shaft (1), the friction wheel carrier (45) provided with several friction wheels (35) can be driven by the driver (13) and the second toroidal disc (27) is connected via a planetary gear (21) and an overrunning clutch (23) following the planetary gear (21) to the hub sleeve (9). The smoothly adjustable step-up ratio of the friction gear (17) is controlled from the interior of the hub shaft (1) via a rod (53) which entrains the pivotally mounted spindle (37) of the friction wheels (35) via a clutch ring ( 47). The rotating toroidal disc (27) is supported via an angular ball-bearing (31) on the thrust collar (33) of an expanding clutch (19) in such a way that the tip (71) of the pressure direction cone (69) defined by the angular ball-bearing (31) is located in the vicinity of the toroidal disc (27) in the center of the hub shaft (1). The toroidal disc (27) can therefore perform tilting movements and provides uniform contact pressure on the friction wheels (35).
REFERENCES:
patent: 2108082 (1938-02-01), Sharpe
patent: 3934492 (1976-01-01), Timbs
patent: 4158317 (1979-06-01), James
patent: 4638687 (1987-01-01), De Brie Perry
patent: 4735430 (1988-04-01), Tomkinson
patent: 4934493 (1976-01-01), Hillyer
Diehl Dwight
Fichtel & Sachs AG
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