Motor vehicles – Special wheel base – Rider propulsion with additional source of power – e.g.,...
Patent
1998-01-02
2000-05-16
Dickson, Paul N.
Motor vehicles
Special wheel base
Rider propulsion with additional source of power, e.g.,...
180220, B62K 1100, B62M 700
Patent
active
060623292
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a pedal bicycle having an auxiliary power means (such as a small internal combustion engine, or a DC electric motor), especially to a pedal bicycle having an auxiliary power means which is provided with two free-wheels and two driving chains, the two free-wheels being driven through respective chains by power from auxiliary power means and rider's pedaling separately.
BACKGROUND OF THE INVENTION
In the known pedal bicycle with auxiliary power means, the auxiliary power means is pivotally mounted on the bicycle frame and a friction wheel is installed at the end of the power output shaft of the auxiliary power means. The boosting effect is then achieved through the friction drive between the friction wheel and the bicycle tire when the wheel is rolling. However, for this kind of friction drive between the friction wheel and the tire, the change of air pressure within the tire often makes the transmission efficiency vary greatly. In particular, it is impossible to ensure the auxiliary power means to work at the rotating speed under the optimum operating condition since the wheel is driven directly by the auxiliary power means. As a result, the auxiliary power means consumes energy excessively. It becomes more obvious in particular when the auxiliary power means is a small gasoline engine. As for the case when clay and gravel are stacked on the tire, the friction transmission efficiency is affected further. The auxiliary power means even can't work normally. Also, a very complicated clutch-transmission and an operating device manipulating the clutch-transmission are used in the prior art for transferring the power from the auxiliary power means to the driving chain in order to boost the driving chain which is driven by the rider's pedaling. As the designed strength of the driving chain is defined according to the force of manpower pedaling, if on the driving chain a driving force is added besides, the chain will be overloaded. Hence, it is easy to be worn or broken. Moreover, in known bicycles using one driving chain, the structure of clutch-transmission is very complicated. Therefore, not only the possibility of failure becomes larger, particularly, the expensive price can't be accepted by the ordinary consumers.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a pedal bicycle with auxiliary power means, having simple structure, no clutch operating device, high transmission efficiency and with low energy consumption (such as fuel consumption). The pedal bicycle with auxiliary power means can be operated very simply and its price is relatively cheap.
With the above-mentioned aims, the present invention provides a pedal bicycle having an auxiliary power means, including a bicycle, an auxiliary power means, a clutch-transmission and the controller of the auxiliary power means connected to a grip of the bicycle through a cable, in which a second free-wheel being mounted on the hub of the bicycle wheel and having the same driving direction as the free-wheel driven by the bicycle pedaling, the second free-wheel being connected with the second chain wheel mounted on the output shaft of the clutch-transmission by a second chain, whereas the second chain makes chain transmission between the second chain wheel and the second free-wheel. The clutch-transmission is mounted on the auxiliary power means and the output shaft of the auxiliary power means is connected to the input shaft of the clutch-transmission; the auxiliary power means together with the clutch-transmission being secured to the bicycle frame.
In a preferred embodiment, the clutch-transmission includes a supporting disk for centrifugal blocks installed within the case, a driven disk, an input shaft, an output shaft and a pair of speed reducing gears, i.e., a small gear and a large gear. The supporting disk for centrifugal blocks is connected to the input shaft securely, and the centrifugal blocks are evenly mounted on the guides of the supporting disk and are
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patent: 4637274 (1987-01-01), Goldenfeld
patent: 5076386 (1991-12-01), Ferneding
patent: 5908078 (1999-06-01), Creixell
Avery Bridget
Dickson Paul N.
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