IMPROVEMENTS IN GAS MOTOR ENGINES
Year: 1887

page_text: I HUGH WILLIAMS of The Mount Stockport in the County of Chester Civil
Engineer, do hereby declare the nature of said Invention for IMPROVEMENTS IN GAS
MOTOR ENGINES, 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 improvements in gas motor engines and particularly to the
type of engine known as "The Stockport" Gas Engine and consists mainly in intro-
ducing one portion of the charge of the explosive mixture of gas and air into the power
cylinder from the extreme inward end of the same and simultaneously introducing
the other portion of the charge from a point in the cylinder near the head of the
piston when at the extremity of its outward stroke whereby I obtain prior to ignition
a perfectly homogeneous combustible charge within the cylinder.
I also propose to ignite the charge when compressed within the combustion
chamber of the cylinder at a point near the head of the piston when at the end of its
inward stroke but this is not an essential feature of my Invention as the present plan
of igniting the charge at or near the extreme inward end of the cylinder may be
retained if more convenient.
And in order that my Invention may be fully understood and readily carried into
effect I will describe the accompanying Sheet of Drawings reference being had to the
figures and letters marked thereon.
Figure 1 is a sectional plan of a gas motor engine constructed according to my
present Invention with two inlets for the explosive charge but provided with the
ordinary arrangement for the ignition of the said charge within the power cylinder.
Figures
2 and 3 are transverse vertical sections taken respectively on the lines A B and
CD, Fig. 1. Figure 4 is a sectional plan on a larger scale of part of the power
cylinder of a gas motor engine furnished with my improved arrangement for ignition
of the charge and Figure 5 is a vertical section taken on the line EF, Fig. 4.
The engine illustrated by the Drawings is of the "Stockport" type that is to say
the charge of mixed gas and air is drawn into and compressed within a charging

page_text: power
cylinder a and exploded in the combustion chamber of the power cylinder 6 the
two cylinders being preferably placed tandem as shown. The piston c of the
cylinder bis connected by a rod d to the crank shaft e and is also connected by a
rod to the piston g of the charging cylinder a so that the two pistons work in
unison i.e. the power piston moving outward moves the charging piston inward. The
usual means or any other suitable arrangement is employed for regulating the
admission of gas and air to the charging cylinder during the outward stroke of the
piston g and the discharge of the same therefrom after compression by the instroke
of the said piston into a pipe or passage not shown leading to a reservoir h see Figs. 2
and 3 where the charge remains under tension until the proper moment arrives for
its admission to the power cylinder b when it passes into the said cylinder through
two inlets h¹h of which the inlet h¹ is situate at the inward end of the cylinder and is
controlled by the valves i, see Fig. 3 and the other inlet 2 is in such a position near
the opposite end of the cylinder that it is only uncovered by the piston during the
slight dwell or pause which takes place on the completion of the outstroke and while
the crank is passing over the dead centre prior to sending the piston back on its
instroke. On the piston c is a shield c¹ which acts as a deflector to prevent the
charge admitted through the inlet * from rushing directly out of the cylinder through
the exhaust port k and also to cause an all round flushing of the cylinder by meeting
the portion of the charge entering from the opposite end under the deflector j. The
charge in the power cylinder bis ignited at the required time by means of an ordinary
slide ignition valve m operated by a rod n and an eccentric on the crankshaft
but any other convenient and suitable device for igniting the charge may be
employed.
In the arrangement shown in Figure 1 the slide valve m on reaching the port and
space in communication with the inlet ignites the portion of the charge contained
in the said space thereby exploding the charge at that moment compressed into the
combustion chamber of the power cylinder b.
In the special arrangement for igniting purposes illustrated by Figures 4 and 5 the
ignition port shown in Figure 1 is dispensed with and instead an ignition port p is
mude near the outward end of the combustion chamber and in such position that when
the piston is at the limit of its inward stroke as indicated by Figure 4 the piston
head will be close to the port p but will not cover it. The slide ignition valve m is
arranged to fire the charge at the moment when the parts are in the relative positions
shown in Figure 4.
The operation is as follows :-
The charge drawn into the cylinder a by the outstroke of the piston g is on the
instroke of the said piston compressed into the reservoir whence a portion enters
the power cylinder b through the inlet h¹ and valves and under the deflector ; and
the remainder enters simultaneously through the inlet h³. At the moment when the
charge thus enters the power cylinder by the two inlets the exhaust port k is already
partially uncovered and the inrushing charge expels from the cylinder 6 through the
exhaust port the products of the combustion of the previous charge leaving only in the
power cylinder a homogeneous charge of explosive mixture which on the return or
instroke of the piston c is compressed into the combustion chamber ready for ignition
by the flame carried in the pocket of the slide valve m at the moment when the piston c
has completed its instroke."
While the power piston c is moving inward the charging piston g actuated by the
rod fis moving outward and drawing into the cylinder a a fresh charge of gas and air
and so on as already described.
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
1. The method of introducing part of the compressed charge or explosive mixture
of gas and air at the inward end of the power cylinder of a gas motor engine and

page_text: uncovered by the piston when at or about the limit of its outstroke substantially in the
manner and for the purposes herein set forth.
2. The construction and combined arrangements of parts whereby the charge or
explosive mixture is simultaneously introduced to the power cylinder of a gas motor
engine through two inlets substantially as and for the purposes herein described and
as shown on the Drawings.
3. The method of and means for igniting the charge at the moment when the power
piston has reached the limit of its instroke and the charge is compressed within the
combustion chamber of the power cylinder of a gas motor engine to which cylinder
the said charge has been previously admitted through two separate inlets at different
points in said cylinder substantially as herein described and as illustrated by
Figures 4 and 5.
DL: 22
1
1007
H. B. BARLOW,
17, St. Ann's Square, Manchester,
Agent for Applicant.