An output gear train of two constant-mesh gearwheels is fastened to the secondary shaft. This arrangement constitutes a basic gearbox.By adding to the basic gearbox a first brake for immobilizing the sun gear and/or a second brake for immobilizing the planet carrier the gearbox is respectively provided with a fourth gear ratio and a first braked neutral setting by combinationof the first brake with the second and third clutches, and/or a reverse gear ratio and a second braked neutral setting by combination of the second brake with the first and third clutches, and a third braked neutral setting by combination of the firstbrake with the second brake.
Such gearboxes are still rugged and efficient but entail multiple layshafts and clutches so that their complexity, cost and overall size increase out of proportion to the number of gear ratios if an adequate level of performance is to beachieved. The first and third clutches respectively couple the input train to the primary shaft and to the secondary shaft.
The object of the present invention is thus a gearbox retaining the original qualities of simplicity, ruggedness and efficiency of the known gearboxes with few gear ratios mentioned above, but also featuring, with a minimum of components andacceptable cost and overall dimensions, an increasing number of forward and reverse gear ratios that are always well distributed, a braked neutral setting in addition to the conventional unbraked neutral setting, and shifting sequences that always entailsingle operations only from one end to the other of the range--that is to say from the highest reverse gear ratio to the highest forward gear ratio--lending itself perfectly to any kind of control system.
Also, in dual range gearboxes changing the range entails a shifting sequence that is no longer a single operation but a double operation--that is to say involving the ELECTRIC BIKE KITS simultaneous control of four clutches instead of two--resulting in muchgreater variations in inertia and much more serious problems in controlling the shifting, while the steps in the gearbox are precisely the same in both ranges, imposing gear ratio distributions that are often inappropriate.This gearbox is the basic gearbox.Such gearboxes are simple, rugged and efficient and of acceptable cost and overall size, but their performance E-BIKE CONTROLLER remains somewhat limited and more often than not the reverse gear ratio is somewhat perfunctorily implemented by means of a dog typesystem..
