Improvements in Differential Gear
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Differential Gear,
I, GEORGES RENÉ BLOT, of No. 16, Rue Drouot, Paris, France, Civil Engineer,
do hereby declare the nature of this invention to be as follows:
My invention relates to differential gear so arranged as to give facilities for
starting, stopping, reversing or varying the speed of a machine, especially such as
are employed to drive motor cars or vessels..
For this purpose, a pair of engines or electric motors, each of which can have
its direction of movement, power and speed independently varied, are connected
by suitable gear each to a bevil wheel, these two wheels facing each other and free
on one shaft on which is also mounted between them free to turn, a drum, sprocket
wheel or toothed wheel from which motion is conveyed by belt, chain, or gearing
to the machine, motor car or vessel. Within this drum or wheel on radial axes
are mounted two bevil pinions both in gear with both the bevil wheels.
When both bevil wheels revolve with equal speed in opposite directions driving
the pinions, the drum or wheel in which they are mounted remains at rest, but
when the relative speed or direction of the bevil wheels is varied, then the drum
or wheel containing the pinions is driven in the one direction or the other with a
speed depending on the relative speeds of the two bevil wheels.
Instead of employing two engines or electric motors one may be employed with
gearing such as conical pulleys, arranged to drive the two bevil wheels at variable
speeds, the motion of the drum or wheel containing the bevil pinions being
determined, as in the former case, by the relative speed of the two bevil wheels.
Dated this 26th day of July 1897.
ABEL & IMRAY,
Agents for the Applicant.
I, GEORGES RÉNÉ BLOT, of No. 16, Rue Drouot, Paris, France, Civil Engineer,
do hereby declare the nature of this invention and in what manner the same is to
be performed to be particularly described and ascertained in and by the following
statement:
My invention relates to differential gear so arranged as to give facilities for
starting, stopping, reversing or varying the speed of a machine, especially such as
are employed to drive motor cars or vessels..
For this purpose, a pair of engines or electric motors, each of which can have
FD011

page_text: its direction of movement, power and speed independently varied, are connected
by suitable gear each to a bevil wheel, these two wheels facing each other and free
on one shaft on which is also mounted between them free to turn, a drum, sprocket
wheel or toothed wheel from which motion is conveyed by belt, chain, or gearing
to the machine, motor car or vessel. Within this drum or wheel on radial axes
are mounted two bevil pinions both in gear with both the bevil wheels.
When both bevil wheels revolve with equal speed in opposite directions driving
the pinions, the drum or wheel in which they are mounted remains at rest, but
when the relative speed or direction of the bevil wheels is varied, then the drum
or wheel containing the pinions is driven in the one direction or the other with a
speed depending on the relative speeds of the two bevil wheels.
Instead of employing two engines or electric motors one may be employed with
gearing such as conical pulleys, arranged to drive the two bevil wheels at variable
speeds, the motion of the drum or wheel containing the bevil pinions being
determined, as in the former case, by the relative speed of the two bevil wheels.
Figure 1 of the accompanying drawings is a front view and Figure 2 is a side
view shewing diagrammatically differential gear according to my invention worked
by a pair of electric motors.
Figure 3 is a diagram shewing the differential gear worked by one motor.
Referring to Figures 1 and 2, B. and A indicate two armatures of electro motors
driven in opposite direction, their commutators having the brushes 1,2 connected
to the terminal, and 3, 4 connected to the terminal of a source of electricity,
the velocities of the armatures being varied as required by rheostats R R¹. On
the axes of the armatures are worms b and c gearing with worm wheels d'e¹
attached to bevil wheels de which gear with pinions f and g mounted on axes
within a drum D which drives a belt or might be toothed to drive a chain, or it
might be connected by gearing to the machine to be driven.
As shewn in Figure 3 a single motor M drives a shaft p carrying a wheel E
which gears with a wheel El on the shaft C of the sprocket drum D. On the
shaft is fixed one H of a pair of cone pulleys, the other H¹ free to revolve on the
shaft C and attached to the bevil wheel d; the other bevil wheel e is attached to
the wheel E¹. In this case as in the apparatus shewn in Figures 1 and 2 the bevil
wheels and e are driven in opposite directions the speed of d being varied as
desired by shifting the belt F along the cones.
The two motors of Figure 1 might be driven in the same direction in which case
the drum D would be driven at a mean speed.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
Differential driving gear arranged and operating substantially as described with
reference to the drawings.