Improvements in or relating to Driving Gear for Motor Vehicles and for other Purposes.
Year: 1899

page_text: Date of Application, 12th July, 1899-Accepted, 26th Aug., 1899
COMPLETE SPECIFICATION.
Improvements in or relating to Driving Gear for Motor Vehicles
and for other Purposes.
A communication from FRIEDRICH MORITZ HILLE, Motor Factory, of Dresden
Löbtau Plauenschestrasse, 30, in the Empire of Germany.
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, in the County of Middlesex,
Chartered Patent Agent, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
In motor vehicles with jointly actuated driving wheels, a differential mechanism
consisting of three or more toothed wheels, is generally used to obtain the relative
revolving speed in the two wheels when the vehicle describes a curve. In other
systems couplings acting on one side are arranged in vehicles with undivided
axles, between the axle and the driving wheels or between the actuating device
and each part of the axle or shaft in motors with a divided axle which couplings
allow the outer wheel to run free when the vehicle travels in a curve for instance
as in the motors described in British Patent No. 23998 of 1898 or United States
Patents No. 333531 and 601205. The present invention relates to a motor of the
latter type differing, however from those cited in that on the eccentric hub of the
driving (toothed) wheel revolubly arranged about the divided axle there are two
friction discs revolubly arranged side by side, which can engage with the inner
sides of two hollow cylindrical friction discs or cups provided respectively on
the two parts of the divided axle in order to couple both wheels when the car
travels in a straight line, owing to the wedging effect of the eccentrics and
uncoupling the friction disc of the outer wheel when the vehicle travels ou a curve
thus setting the outer wheel free to partake of the necessary greater angular
velocity. This system of eccentrically arranged friction discs in combination with
friction cups is characterised by the fact,. as compared with other systems that
it works without noise and shock and that the operation of coupling does not
depend on certain relative positions of the parts to be coupled, the coupling
being possible at any time and in any position of the parts. Besides these
advantages the friction cups act as a protective case against dust and damp while
the absence of teeth, pawls, bolts, springs and the like, which are easily injured
is a decided advantage.
In the accompanying drawing a method of construction, suitable for tricycles
and other similar vehicles is illustrated by way of example, Fig. 1 being a view
of the casingh with the side plate i removed and the driving gear with a section
through the eccentric sleeve e of the driving wheel while Fig. 2 is a transverse
section on the line A-B of Fig. 1.
The axle halves a and beach of which is provided with its corresponding road
wheel are supported on ball bearings in the sleeves and 1 (Fig. 2) which are
connected with the casing hand side plate respectively. The road wheels are
not shown in the drawing. The two cup discs c and d with a free space between

page_text: them, secured to the ends of the two abutting axle halves can be made to gear
with each other and act as friction discs.
I
The wheel driven by the motor o is revolubly arranged on say the right half a
of the axle and is provided with an eccentric sleeve e (Fig. 1) projecting into the
hollow space of the friction cups c and d. On this eccentric sleeve are revolubly
arranged side by side and independently of each other two friction discs
and f,
the disc co-operating with the cup d on the axle half a while the disc
co-operates with the cup c on the axle half b. The friction discs are pressed
against each of the friction cups when the driving wheel revolves in the direction
indicated by the arrow and the vehicle moves in a straight line, thus coupling
the driving wheel r with both halves of the axle. When, however,--in describing
curves one of the road wheel increases its angular velocity, the coupling pro-
duced by friction between the disc g and its corresponding cup c is broken thus
allowing the outer wheel,, describing the greater curve to run freely and to
increase its angular velocity without hindrance, the inner wheel running on the
shorter curve acting alone during such time as the driving wheel.
For braking purposes a concentric brake disc p provided with a brake band may
be cast in one piece with the driving wheel r. This brake device however forms
no part of the present invention.
Having now particularly described and ascertained the nature of the said
invention as communicated to me by my foreign correspondent and in what
manner the same is to be performed, I declare that what I claim is:
1. Driving gear for motor cars and for other purposes comprising a divided axle
or shaft a driving wheel such as freely revoluble as regards the halves of the
axle an eccentric sleeve on the driving wheel two friction discs revolubly mounted
on said sleeve and two friction cups c fast on the respective halves of the axle
and co-operating with their respective friction discs substantially as described.
2. The complete differential driving mechanism substantially as described
or illustrated in the accompanying drawings.
P
1000