Drive device for an electric bicycle and electric bicycle
AssigneePorsche eBike Performance GmbH
InventorJohannes Biechele
Life of this patent
Estimating the term…
Abstract
In an embodiment a driving device for an electric bicycle includes a motor unit having an electric motor configured to drive the electric bicycle, a first gear stage and a second gear stage, wherein the first gear stage is coupled to the motor unit on the one hand and to the second gear stage on the other hand, wherein the second gear stage is configured to output a torque configured to drive the electric bicycle, and wherein the second gear stage is a strain wave gear and is arrangeable coaxially with respect to an axis of rotation of a pedal crank of the electric bicycle.
Claims14
A driving device for an electric bicycle, the driving device comprising:
- a motor unit comprising an electric motor configured to drive the electric bicycle;
- a first gear stage;
- and
- a second gear stage,
- wherein the first gear stage is coupled to the motor unit and to the second gear stage,
- wherein the second gear stage is configured to output a torque configured to drive the electric bicycle,
- wherein the second gear stage is a strain wave gear and is arrangeable coaxially with respect to an axis of rotation of a pedal crank of the electric bicycle,
- wherein the first gear stage is a belt gear, which comprises a first gear wheel, a second gear wheel and a belt element, which couples the two gear wheels to one another,
- wherein the first gear wheel is coupled to the motor unit and the second gear wheel is coupled to the second gear stage, and
- wherein the second gear wheel of the belt gear is coupled to an outer ring of the strain wave gear and a radial coupling element is coupled to the pedal crank.
A driving device for an electric bicycle, the driving device comprising:
- a motor unit comprising an electric motor configured to drive the electric bicycle;
- a first gear stage;
- and
- a second gear stage,
- wherein the first gear stage is coupled to the motor unit and to the second gear stage,
- wherein the second gear stage is configured to output a torque configured to drive the electric bicycle,
- wherein the second gear stage is a strain wave gear and is arrangeable coaxially with respect to an axis of rotation of a pedal crank of the electric bicycle,
- wherein the second gear stage comprises:
- a wave generator,
- a cylindrical outer ring with internal toothing,
- an elastic transmission element having external toothing preformed to match the internal toothing of the outer ring, and
- a radial coupling element,
- wherein the wave generator is configured for predetermined deformation of the transmission element,
- wherein the outer ring is an input and the radial coupling element is an output of the second gear stage, and
- wherein the transmission element is arranged between the outer ring and the radial coupling element and provides a predetermined transmission ratio of the second gear stage.
Dependencies are inferred from the claim text.