Motor vehicles – Special wheel base – Rider propulsion with additional source of power – e.g.,...
Reexamination Certificate
2000-09-21
2001-07-24
Depumpo, Daniel G. (Department: 3611)
Motor vehicles
Special wheel base
Rider propulsion with additional source of power, e.g.,...
C180S207100, C475S004000
Reexamination Certificate
active
06263993
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a bicycle, more particularly to a transmission assembly for an electrically powered bicycle, which has an electrical transmission unit that is provided with a planetary gear device.
2. Description of the Related Art
In a conventional electrically powered bicycle, the rotation of a motor shaft is transferred to a front sprocket by means of an electrical transmission unit which has a relatively large number of parts, thereby resulting in greater power loss and increased volume.
Therefore, the object of this invention is to provide a transmission assembly for an electrically powered bicycle, which has an electrical transmission unit that is provided with a planetary gear device and an auxiliary speed-reducing device so as to reduce the volume and the power loss of the assembly.
According to this invention, a transmission assembly for an electrically powered bicycle has a manual transmission unit and an electrical transmission unit. The electrical transmission unit includes a planetary gear device for transferring rotation of a motor shaft of a motor to a front sprocket.
SUMMARY OF THE INVENTION
Therefore, the object of this invention is to provide a transmission assembly for an electrically powered bicycle, which has an electrical transmission unit that is provided with a planetary gear device and an auxiliary speed-reducing device so as to reduce the volume and the power loss of the assembly.
According to this invention, a transmission assembly for an electrically powered bicycle has a manual transmission unit and an electrical transmission unit. The electrical transmission unit includes a planetary gear device for transferring rotation of a motor shaft of a motor to a front sprocket. Preferably, the electrical transmission unit further includes an auxiliary speed-reducing device, which is connected operably to a controller. Accordingly, a greater torque can be output from the electrical transmission unit to the front sprocket.
REFERENCES:
patent: 5570752 (1996-11-01), Takata
patent: 5829546 (2000-06-01), Tseng
patent: 5937962 (1999-08-01), Yokayama
patent: 5941333 (1999-08-01), Sun et al.
patent: 6080073 (2000-06-01), Tseng
patent: 1467959 (1967-02-01), None
Christie Parker & Hale LLP
DePumpo Daniel G.
Giant Manufacturing Co. Ltd.
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