Improvements in Variable-speed Gearing for Gas and like Motors.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Variable-speed Gearing for Gas and like Motors.
I, WILLIAM EDMUND SIMPSON, of 28, Victoria Street, Westminster, in the
County of London, Engineer, do hereby declare the nature of this invention
to be as follows:-
This invention relates to an improved arrangement of speed gearing for use in
conjunction with motors working on the Otto or four-stroke cycle, whereby such
gear may be of simpler and cheaper construction and self-contained with the motor
so as not to require separate foundations or framing.
According to the said invention the usual half-speed cam-shaft and pair of
gear-wheels are made of such strength as to be capable of transmitting the
whole power of the motor, and on the cam-shaft is mounted a third pinion
or wheel gearing with a fourth pinion or wheel co-axial with the motor shaft.
In line with the motor shaft is a second shaft, and upon said shaft is a
clutch adapted to engage either with the motor shaft or with the fourth pinion
or wheel, in such manner that the second shaft may be driven at the same speed
as the motor shaft or at such other speed as is determined by the ratio of the
third and fourth wheels. The ratio of the first and second gears must be two to
one or a multiple thereof as, for instance, four to one, in which latter case the cams
would be double so as to give two four-stroke cycles per revolution of the cam-
shaft.
The aforesaid clutch preferably consists of a disc keyed on the second shaft, a
ring on said disc driven therefrom by carrier pins and split in one or more places,
and a grooved collar adapted to be moved by a lever or other means along the
shaft and having a rack or racks gearing with a pinion or pinions on a double-
ended right and left hand screw or screws in the adjoining ends of the split ring,
so that when the grooved collar is moved in one direction the ring is expanded
into an annular extension of the fourth wheel, while when the collar is moved
in the other direction the ring is contracted upon a drum keyed to the motor
shaft.
Additional pairs of gears and clutches may be employed when more than two
speeds are required, and an idle wheel may be interposed between one or more
pairs to obtain a reverse motion. The whole of the gearing is enclosed in the
casing of the motor, or in a casing attached thereto, having means for centralizing
it, and the clutch may be immersed in a bath of water or oil.
Datad ibie 10th day of June 1899
WILLIAM EDMUND SIMPSON,
Applicant.

page_text: •
Improvements in Variable-speed Gearing for Gas and like Motors.
I, WILLIAM EDMUND SIMPSON, of 28, Victoria Street, Westminster, in the
County of London, 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:-
This invention relates to an improved arrangement of speed gearing for use in
conjunction with motors working on the "Otto" or four-stroke cycle, whereby
such gear may be of simpler and cheaper construction and self-contained with the
motor so as not to require separate foundations or framing.
The invention is illustrated in the accompanying drawings in which
Fig. 1 is a longitudinal sectional plan of a motor with a variable speed gearing
provided in accordance with the invention.
Fig. 2 is a detailed front elevation of the clutch, and
Fig. 3 is a side sectional elevation of the operating racks employed.
According to the said invention the usual half speed cam shaft m¹ and a pair
of gear wheels, are made of such strength as to be capable of transmitting
the whole power of the motor, and on the cam shaft m is mounted a third pinion
or wheel gearing with a fourth pinion or wheel q' co-axial with the motor
shaft d, di. In line with the motor shaft d, d' is a second shaft d³, and upon said
shaft is a clutch adapted to engage either with the motor shaft d, d¹, or with
the fourth pinion or wheel q', in such manner that the second shaft d³ may be
driven at the same speed as the motor shaft or at such other speed as is determined
by the ratio of the third and, fourth wheels p¹, g respectively. The ratio of
the first and second gears p, q, must be two to one, or a multiple thereof, as for
instance four to one in which latter case the cams would be double so as to give
two four stroke cycles per revolution of the cam shaft.
The aforesaid clutch preferably consists of a disc 2 keyed on the second
shaft, a ring 7 on said disc driven or carried by pins 3, and split in one or
more places, and a grooved collar 4 adapted to be moved laterally by a lever or
other means upon a rim extension 92, of the pinion q, and having racks 6 secured
to the collar 4 which gear respectively with pinions 7, on double ended right
and left hand screws 8 in the adjoining ends of the segments of the split ring 1, so
that when the grooved collar 4 is moved in one direction the ring 1 is expanded
and forced against the annular extension of the fourth wheel g¹, while when the
collar is moved in the other direction the ring 1 is contracted upon the rim
extension of the pinion q.
The segments of the split ring 1 are mounted loosely upon the pins 3 so that the
slight radial movement necessary is permitted.
Additional pairs of gears and clutches may be employed when more than two
speeds are required, and an idle wheel may be placed between one or more pairs to
obtain a reverse motion.
The whole of the gear is enclosed in the casing 3 of the motor, or in a casing
attached thereto having means for centralizing it, and the clutch may be immersed
in a bath of water or oil.
Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, I declare that what
I claim is:-
-
1. In an
"Otto" cycle motor, in combination with the usual two to one
gearing for the valve shaft, or with gearing whose ratio is as a multiple of two

page_text: to one, the additional gears and clutches whereby two or more speeds may be
imparted to a driving shaft co-axial with the motor crank shaft, substantially
as described.
2. The improved clutch substantially as described
Dated this 10th day of April 1900.
EDWARD EVANS & Co.,
Chartered Patent Agents,
Lonsdale Chambers, 27, Chancery Lane, London, W.C.. and
105, Colmore Row, Birmingham, Agents for the Applicant.