Motor vehicles – Special wheel base – Having only two wheels
Patent
1990-02-13
1991-09-24
Marmor, Charles A.
Motor vehicles
Special wheel base
Having only two wheels
280275, 280276, 280277, 280279, B62K 1100
Patent
active
050506994
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle having two wheels, an engine which drives at least one of the wheels, a gearbox, a frame connected to the engine and two front and rear suspension arms of the pivotal type.
A vehicle is known which comprises driving wheels capable of being uncoupled and a device for adjusting the castor and the castor angle of the front wheel and is described in PCT/FR88/00073.
More particularly, in the case of the described vehicle having two wheels, two synchronous and distinct driving shafts are provided, one for rear wheel and the other for the front wheel. The suspensions are of the type having a pivotal arm and a pivot axis of each of these arms is distinct from the axis of the driving shafts. This makes it necessary for example in the case of a chain transmission, to require a tightener for compensating for the tension of the chain upon movements of the arm. Moreover, the weight of the different transmission elements is great. Also, reliability is reduced bearing in mind that the number of moving parts is large and the useful power may be reduced, in particular by losses due to friction.
Furthermore, the steering unit comprises a steering column driven in rotation at one end by a handlebar and connected at its other end to a compass system itself articulated to a front steering fork, the latter being fixed to an inner hub which is rotatably mounted to be steerable on a pin carried by a pivot connected to the pivotal arm.
In order to facilitate the steering orientation of the front wheel, the articulations are of the universal type, but this results in particular in an increase in weight, a reduction in handling and reliability, a higher cost and increased maintenance.
SUMMARY OF THE INVENTION
A vehicle having two wheels according to the invention comprises a suspension having pivotal arms which avoids the mounting of a device for automatically taking up the differential play in transmissions during their movements, while reducing the number of moving parts and which allows the mounting of a simple and effective clutch release for the front wheels, a multi-use frame, and a steering unit which includes a compass system and has a reduced number of parts.
For this purpose, the invention provides a vehicle comprising at least two wheels, a motor which drives at least one of the wheels, a gearbox, a frame connected to the motor and two front and rear suspension arms of the pivotal type fixed to the motor at respective first ends, characterized in that at least one of the pivotal arms is mounted to be pivotable relative to the motor about an output shaft of the gearbox.
Furthermore, the invention is characterized in that the front wheel comprises driving means with a clutch release device, in particular of the centrifugal type mounted coaxially with the output shaft of the gearbox.
The vehicle according to the invention is further characterized in that the frame comprises at least two tubes interconnected at first ends and connected at second ends to the motor so as to form a frame, these tubes being capable of being employed as an air supply intake for the motor.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described with respect to a particular embodiment with reference to the accompanying drawings, in which:
FIG. 1 represents a side elevational view of a vehicle having two wheels according to the invention;
FIG. 2 represents a diagram of displacements of moving elements of the vehicle; and
FIG. 3 represents a sectional view of an output shaft of a gearbox and of a clutch release device.
DETAILED DESCRIPTION OF THE INVENTION
The invention having two wheels according to the invention comprises a frame 10, two front 12 and rear 14 swing or pivotal arms, a motor 16 having a gearbox 18, two transmissions 20, 22 respectively driving the front wheel 24 and rear wheel 26.
The rear pivotal arm 14 comprises a rear fork 28 on one of the ends of which is mounted a spindle 30 of the rear wheel 26 while the other end is rotatably mounted coaxi
REFERENCES:
patent: 4671375 (1987-06-01), Oike et al.
patent: 4828069 (1989-05-01), Hatsuyama
patent: 4842091 (1989-06-01), Bodsey
Kagen Alan M.
Marmor Charles A.
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