Improvements in Gas Motor Engines.
Year: 1891

page_text: COMPLETE SPECIFICATION.
Improvements in Gas Motor Engines.
I, MARTIN EVERS, of the Hydraulic and General Engineering Works, Saynor
Road, Hunslet, Leeds, in the County of York, 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 the construction of an automatic or selfacting admission
valve for controlling the supply of gas and air or other combustible or explosive
fluids into the cylinder of a gas motor engine and for thoroughly mixing such fluids
so as to ensure perfect homogeneity during admission into the cylinder prior to
compression and ignition in the ordinary manner whereby great certainty of ignition
and explosion is secured combined with perfect combustion of the entire explosive
compound.
In conjunction with said automatic valve I apply a deflecting plate rather less in
diameter than the cylinder and which is fixed just over the admission valve for
limiting the distance such valve will open and for the special purpose of deflecting
the explosive gases, during admission so as to clear away from the bottom or rear end
of the cylinder the residium of previous explosions aud for ensuring the presence of
an ignitable compound when compressed up the ignition tube which is located about
the level of or in the same plane as the said deflecting plate.
The action of the valve is entirely automatic and will efficiently fulfil the above
conditions whether the engine be running quickly or slowly and may readily be
applied either to a vertical or horizontal form of engine.
The engine when fitted with this valve may be governed by a bellcrank or
T lever hit or miss arrangement. Or where great steadiness and uniformity of
motion are essential a revolving governor arrangement can be applied for increasing
or diminishing the quantity of air per explosion admitted into the cylinder and
producing a correspondingly more or less powerful explosion, thus while giving
an explosion every alternate revolution such explosions are of varying power
responding to the variations in the air supply which as stated above can be
controlled by the governor.
In the annexed drawings,
Fig. 1, shows in elevation the general arrangement of a gas-motor engine of the
vertical type with its cylinder A, suspended by its upper flange on two pro-
jections B, B, cast as part of the upright framework. The cylinder being bolted
in this position gives great stability to the structure. The pinion C, and spur
wheel D, are here shown, the pinion is fixed on the crank shaft within the frame,
the spur wheel in gear therewith is carried on the stud pin E, fixed in the frame.
On the boss of the said spur wheel a cam F, is formed, shown also in Fig. 3.
Fig. 2, is a sectional elevation showing the relative positions of the admission
valve G, the exit valve H, the gas inlet pipe I, and the exhaust pipe J.
Fig. 3, is a side elevation partly in section, one side frame and the cylinder being
removed showing position of exit valve levers K, also hit or miss governor
arrangement L. The exit link M, is held against its actuating cam F, by_a
spring N, as seen in Fig. 1. When the link M, is quickly depressed by the cam F,
the transverse lever O, which is carried by a stud pin P, fixed to the frame, opens
the gas valve located at Q, when required, engaging or disengaging with the gas
valve spindle R, according to the varying speed of the engine, by means of the
bellcrank or T lever S, shown.
Fig. 4, is a plan of the deflecting plate T.
TTL he dine wolva G removed showing

page_text: the relative positions of the gas chamber V, and passage with gas holes W, air
holes X, and the two valve seatings Y, Y.
Fig. 6, shows the disc valve G, with central guide spindle, taking upon the two
separate circular seats Y, Y. These seatings by preference form part of the end
cover U, in this case. In the central part of the said cover U, a small gas
chamber V, is formed to which the gas pipe is attached for supplying the engine.
In some cases I prolong the central spindle of the valve G. and pass it through the
gas chamber and a gland and furnish it with a spring adjusted to assist its backward
action (shown in dotted lines Fig. 6). Now between the central valve spindle and
the inner valve seat Y'a suitable number of small holes are drilled for the passage
of gas when the valve opens (and are marked W). Between the two valve
seatings Y, Y, another set of holes X, are drilled through the said cover com-
municating directly with the atmosphere. This figure also shows immediately over
the disc valve G, the deflecting plate T, somewhat less in diameter than the bore of
the cylinder as previously referred to.
Figs. 7 and 8, are a plan and elevation respectively, showing how the same
principle of automatic admission valve may be made in another form with only one
valve seat.
Fig. 7, shows the cylinder cover U, in plan with the valve G removed and air
holes ✗, drilled directly through the valve seat, the gas holes W, are drilled
through the cover as near the centre as is convenient into the gas chamber V, as
described and shown with respect to Fig. 6. When the valve G, is resting in
position, the air holes X, through its seat are quite closed, thereby shutting off the
passage of gas from the gas chamber as well as cutting off all access of air from the
atmosphere, as will be readily seen in Fig. 8.
The action of the automatic admission valve is as follows -When the engine
piston commences its outward stroke a partial vacuum is formed in the cylinder.
The atmospheric pressure through the air holes X, and the gas pressure through
the gas holes W, conjointly raise the valve G, from its seats or seat as the case
may be and pass through their respective orifices from under the valve and
deflecting plate into the cylinder just as quickly as the piston continues its outward
struke. Now as the air and gas are drawn together through the one valvo with its
deflecting plate over it, it will be obvious that all necessary conditions are furnished
for producing perfect homogeneity throughout the explosive mixture during
admission into the cylinder. When the piston has reached the end of its outward
stroke the valve G, at once closes automatically and held to its seats or seat during
the next inward and outward strokes of piston by the compression and explosion.
For the second instroke the exit valve H, is opened for the discharge of spent
gases. Succeeding piston strokes repeating the cycle of operations herein just
before 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 construction of an automatic valve for controlling automatically the
admission of gas and air or other explosive compound into the cylinder of a gas
motor engine, substantially as described and shown in the drawings annexed.
2. The construction of an automatic valve such as referred to in Claim 1, with
either one or two valve seats as shown in the drawings annexed.
3. The prolongation of the central spindle of the automatic valve above referred
to and extending it through a gland and holding the valve to its seats or seat by
an ordinary spiral spring arrangement as shown by dotted lines in Fig. 6, of the
accompanying drawings.
4. That this valve furnishes special facilities for controlling the supply of air or
gas or both by suitably apportioning the size and number of the admission
orifices.

page_text: 5. The general arrangement and method of actuating the exit valve H, as not
being heretofore usual in gas motor engines.
Dated thin och 11001
Witness:
THOS. E. CRAVEN,
24, Victoria Chambers, Leeds,
Chartered Patent Agent.
MARTIN EVERS.