Improved Differential Toothed Gearing.
Year: 1889

page_text: Date of Application, 18th Nov., 1889
Complete Specification Left, 22nd May, 1890-Accepted, 28th June, 1890
PROVISIONAL SPECIFICATION.
Improved Differential Toothed Gearing.
I WILLIAM EDWARD MARCHINGTON of Albert Place, Dickenson Road Longsight,
Manchester Lancashire Draughtsman do hereby declare the nature of this invention
to be as follows:-
The object of this invention is to provide improved differential toothed gearing of
the sun and planet bevil wheel type, for use in various machines either as slow motions
or for adding a proportion of varying speed to a constant motion, as in the roving
frame and other textile machines &c.
I mount the planet bevil wheel (or wheels) at a more or less acute angle with the
sun bevil wheel (or wheels) so that the circumference (or circumferences) of the
former shall embrace or include the axis or centreline of the latter. A certain ratio
between the numbers of teeth in these bevils produces the differential speed required.
In one arrangement I employ one sun bevil wheel and one plauet bevil wheel. In
another arrangement I employ two sun bevil wheels and two planet bevil wheels.
The planet bevil wheels in these arrangements I mount on universal joints or skewed
bushes or otherwise, rolling them round the sun bevils by means of cams or other
suitable devices.
COMPLETE SPECIFICATION.
Improved Differential Toothed Gearing.
I WILLIAM EDWARD MARCHINGTON of Albert Place Dickinson Road Longsight
Manchester in the County of Lancaster Mechanical Draughtsman 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 :-
The object of this invention is to provide improved differential toothed gearing of
the "sun-and-planet" bevil wheel type, for use in various machines, either as slow
motions, or for adding a proportion of varying speed to a constant motion as for
instance in the roving frame and various other textile machines.
The nature of my said invention and the manner in which the same is to be
performed, or carried into practical effect will be readily understood on reference to
the sheet of drawings hereunto annexed and the following explanation thereof.
Fig. 1. is a longitudinal section and Fig. 2 a side elevation of one arrangement of
my invention wherein one "sun" bevil wheel and one "planet" bevil wheel are
employed, and Fig. 3. is a section of a modification of the same.
Fig. 4 is a longitudinal section of an alternative arrangement wherein two "sun"
bevil wheels, and two planet bevil wheels are employed and Fig. 5. is a section of a
nodification thereof.
The first arrangement with two bevil wheels is better adapted for low ratios of speed.
and the latter with four bevil wheels for high ratios.
For the purposes of explaining my invention I have used the terms "sun" and
"planet" bevil wheels, the "sun bevil wheels being those whose axial line is
coincident with that of the driving shaft (see dotted line 1.) and the "planet bevil
wheels"
are those whose axial line is excentric or at an angle thereto (see dotted line 2)
and revolves round the same. The "planet bevil wheels" are mounted at a more or
less acute angle to the sun bevil wheels, so that the circumference of the former shall
embrace or include the axis or centre line of the latter.

page_text: The drawings represent the gearing as arranged for application to a roving frame,
wherein the bobbins lead the flyers, in which case a constant decrease of speed is
required. For cases wherein an increase of speed is desirable the position of some of
the parts would require to be reversed.
a is the driving shaft, 6 a loose sleeve thereon driven by the cones and c a similar
sleeve which drives the bobbins.
Referring to Figs. 1. and 2. d is the "sur" bevil wheel which is made fast on the
driving shaft a by the set screw e, and f is the "planet" bevil wheel the working face
of which is bevilled inwards, so that the two wheels are in perfect pitch and can work
together face to face notwithstanding the difference in their diameter and consequently
in the number of their teeth, whereby I am enabled to overcome a mechanical defect
which exists in differential gearing of a similar type wherein two crown wheels of
different diameters are geared together.
"
The "planet" bevil wheel is carried on a universal joint or gimbal g and is
provided with a circumferential flange h which revolves in contact with the angular
cam surface of a box which encloses the wheels and forms part of the loose sleeve b
so that the "sun" and "planet" wheels as they revolve will be always kept in gear at
one portion of their working faces and it will be evident that as the "planet" wheel f
is larger in diameter, and has more teeth on its face than the " sun wheel d which
drives it the required differential motion will be obtained.
In the modification shown at Fig. 3. it is the "sun" wheel & which is internally
bevilled, and the boss g¹ of the gimbal g is fixed to the shaft. The boss f¹ of the
planet" wheel turns on a skewed excentric bush b¹ forming part of the loose sleeve a
which is driven by the cones.
"
65
"
sun wheels and two
Fig. 4 shews the arrangement of the gearing wherein two "
planet" wheels are employed. Of the two "sun" wheels the inner one d is fixed
on the shaft a and the outer sun wheel d¹ is cast with the sleeve c. These two "sun
wheels both face in the same direction.
37
The inner and outer "planet" wheels f and f², are bolted cast or otherwise fixed
together and mounted on a gimbal g the back of the wheel f2, working against the
angular cam surface of the box i.
In the modification shown at Fig. 5. the "planet" wheels f aud f2, are also bolted
cast or otherwise fixed together and their bosses work on the skewed bush t¹ which
is fixed to or forms part of the loose sleeve b.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what
I claim is―
First. The general construction and arrangement of improved differential toothed
gearing as herein before particularly described and illustrated by the drawings
annexed.
Secondly. I claim (in differential toothed gearing of the "sun " and "planet." bevil
wheel type) the combination of an externally bevilled "sun" wheel with an internally
bevilled "planet" wheel, the latter carried by a gimbal or universal joint and provided
with a circumferential flange working against an inclined cam surface as hereinbefore
described and illustrated by Fig. 1. and 2. of the drawings.
Thirdly. I claim (in differential toothed gearing of the sun and planet bevil wheel
type) the combination of an internally bevilled "sun" wheel with an externally
bevilled planet" wheel the latter carried by a gimbal or universal joint and its boss
working on an excentric skewed bush as herein before described and illustrated by
Fig. 3. of the drawings.
Fourthly. I claim (in differential toothed gearing of the sun and planet bevil
wheel type) the combination of two externally bevilled "sun" wheels both facing in
the same direction with two externally bevilled planet wheels bolted cast or fixed
together and carried on a gimbal or universal joint the back of the outer planet wheel
working against an inclined cam surface as herein before described and illustrated by
Fig. 4. on the drawings, and

page_text: "
"
Fifthly. I claim (in differential toothed gearing of the sun and planet bevil wheel
type) the combination of two externally (or internally) bevilled, Sun wheels, both
facing in the same direction, with two internally (or externally) bevilled planet"
wheels bolted cast or fixed together and with their bosses turning upon a skewed bush
as hereinhefore described and illustrated by Fig. 5 on the drawings.
TX
0.1
•
1000
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.