Transmisión de bicicleta que comprende - un engranaje recto (10), que presenta una rueda central estacionaria (11) con un eje de cojinete central (y1) que discurre céntricamente en el interior, así como una rueda planetaria (12) que rueda sobre la rueda central (11) y rota en torno a un eje de cojinete de rueda planetaria (y2), - una rueda dentada (30), por medio de la cual se puede accionar un agente de tracción (31), caracterizada por, una articulación de cuatro barras (20) que interacciona con el engranaje recto (10) y que comprende una manivela (21) que está unida de manera fija con la rueda planetaria (12) y de manera móvil giratoria con una manivela de pedal (22) y presentando la rueda dentada (30) una forma ovalada.
Disclosed is a gearbox having a central shaft (1), which is rotatably mounted relative to a stationary frame element (2) by means of at least one central shaft bearing (3), a first sun gear (4a) arranged concentrically around the central shaft (1) and fixedly secured to the frame element (2), a power transmission means (5) that is fixed in relation to the central shaft (1), and at least one first gearbox assembly (6a) rotating relative to the frame element (2) and comprising: a support plate (7), the first section (7a) of which is non-rotatably connected to the central shaft (1) and on the second section (7b) of which a planetary gear (8) is mounted by means of a planetary gear bearing (9), wherein the planetary gear (8) meshes with the first sun gear (4a) and a crank arm (10) engages rigidly with the planetary gear (8); and a driving crank (11), on which the crank arm (10) is hingedly mounted by means of a driving crank-crank arm bearing (12) and which is supported relative to the support plate (7) by means of a kinematic coupling means (13). The aim of the invention was to provide a gearbox which has the most compact dimensions possible in the axial direction of the central shaft and in which the rotating driving crank (11) operates with as near to zero backlash as possible. According to the invention the aim is achieved by a gearbox in which the kinematic coupling means (13) is a swing arm (14).
Transmisión de bicicleta con plato no circular
2021-02-09
Patent
Electronic Resource
Spanish
IPC: | B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer |
Bicicleta con transmisión hidráulica con regulación automática
European Patent Office | 2017
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