Improvements in or connected with Electric Driving Gear.
Year: 1897

page_text: Date of Application, 7th Dec., 1897-Accepted, 9th Apr., 1898
COMPLETE SPECIFICATION.
Improvements in or connected with Electric Driving Gear.
We, ERICH CORRENS, of No. 106, Bismarkstrasse, Charlottenburg, and Dr. ERNST
NOAH and Dr. GEORG NOAH, of the Firm of C. Wilh. Kayser & Co., of No. 26, Kaiserin
Augusta-Allee, Berlin, both in the Empire of Germany, Engineer and Manufacturers,
respectively, 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:-
This invention relates to an electric driving gear for those cases where two
shafts are required under certain circumstances to assume different speeds of
rotation the one to the other.
to
Hitherto where two shafts in consequence
of outside influences had
assume different speeds it was necessary to employ either two different motors or
to insert a differential gear between the two shafts.
This invention affords an extraordinary simple means for rotating from a single
electro-motor, and without differential gearing, to different shafts connected with
one another in any suitable manner and which may be temporarily allowed to
rotate at different speeds. This is attained by causing the one shaft to be driven
from the armature and the other from the magnetic fields, the latter and also
the armature being revolubly mounted.
Such an arrangement is shown in the accompanying drawings, in which :-
Figure 1 is a longitudinal sectional elevation; and
Figure 2 an end view partly in cross section; whilst
Figure 3 shows a section of a modified form.
A shaft b is mounted in the usual manner in supports a. The shaft b carries an
armature c and commutator d and also a magnet casing or yoke e and field coils f.
A brush holder g for the brushes which rub on the commutator d, is arranged on
the magnet casing or yoke e and also to insulated friction rings or collectors h and i
on which rub two brushes k and l, which in turn are carried by a projection m on one
of the supports a. A cogwheel n is firmly connected with the magnet casing e and
gears with a cogwheel o keyed on one of the shafts p which is to be driven. On the
armature shaft b a cogwheel q is mounted which engages with a pinion r, the latter in
turn engaging with a cogwheel mounted on the other shafts which is to be driven,
so that both shafts p and 8 are operated in the same direction.
Instead of gear
wheels q r t there may of course be employed a driving gear fixed on the armature
shaft to engage in an internally toothed wheel arranged on the shaft 8.
Instead of the arrangement shown in Figure 1 in which the armature shaft itself is
mounted in the bearing a, the modified form shown in Figure 3 might also be
employed, in which one end of the magnet casing e is revolubly mounted in one
of the supports and carries in turn the corresponding end of the armature shaft. A
cogwheel n¹ which serves for driving one shaft p is screwed on the part of the magnet
casing which projects beyond the support whilst otherwise all the rest remains
unaltered.
Instead of mounting the armature on the shaft, the magnetic field may be connected

page_text: with the shaft and the armature arranged revolubly around the magnetic field without
in any way thereby altering the essential part of the present invention.
Belt pulleys p² 81 are mounted on the two shafts p and s and from these pulleys the
power is transmitted by means of belts. Of course instead of belts, chains, cogwheel
gearing or the like may be employed for the transmission.
The two driving wheels of an auto-car may also be mounted on the shaft p and 8,
for instance directly, and thus the apparatus herein before described may be without
further alteration employed for driving auto-cars and other like vehicles in which two
wheels are brought into a dependent condition the one on the other by running on a
road or street. In vehicles it happens as is well known that one wheel when travelling
round curves travels considerably slower and when turning on the spot is actually
stationary or must run backwards. All this may be attained without further trouble
by the electrical driving apparatus herein before described.
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 :-
:-.
1. An electrical apparatus for driving two shafts at equal speeds but allowing them
to rotate, in case of need, at different speeds, characterised by the one shaft being
driven from the armature and the other from the magnetic field of an electro-motor,
substantially as hereinbefore set forth.
2. The application and use for autocars, of a driving gear such as herein before
described, the two driving wheels of the autocar which are mounted in the revoluble
fore-carriage being driven by the armature acting on the one and the magnetic field
on the other wheel, with the object of enabling the necessary difference in the speed
of the two wheels to be attained when travelling round curves and turning,
substantially as described.
3. The general construction and combination of parts taken as a whole, forming the
improved electric driving gear substantially as hereinbefore described and illustrated:
Dated this 6th day of December 1897.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.