Improvements in Gas and similar Motor Engines.
Year: 1893

page_text: Date of Application, 9th Feb., 1893
Complete Specification Left, 9th Nov., 1893-Accepted, 9th Dec., 1893
PROVISIONAL SPECIFICATION.
Improvements in Gas and similar Motor Engines.
I, ALFRED ROWE BELLAMY, of Algoa Lodge, Adswood Lane, Stockport, in
the County of Chester, Engineer, do hereby declare the nature of this invention to
be as follows:-
My invention relates to improvements in gas and similar motor engines, and
particularly to those which have the "Otto" cycle of operations or a similar
cycle.
The chief object of my improvements is to reduce the terminal pressure of the
effective stroke without reducing the initial pressure of the explosive fluid
mixture.
I accomplish this object by the following improved cycle-
First stroke. The piston during its outstroke draws into the cylinder a full charge
of air.
Second stroke. The piston during a portion of its instroke expels part of the air
drawn in during the first stroke, and during the remainder of its instroke com-
presses the air, and an injected charge of gas or hydrocarbon vapour.
Third stroke. This is the working or effective stroke, the charge compressed
during the second stroke being ignited and the piston thereby impelled outward.
Fourth stroke. The products of combustion are expelled by the instroke of the
piston.
The above series of operations constitutes the improved cycle.
The charge of gas or hydrocarbon vapour is injected into the cylinder during
the instroke of the piston as mentioned under the second head whilst the exhaust
and air admission valves are closed, and the injection may be effected by means of
a pump or other suitable appliance worked by the engine or otherwise as
convenient.
Dated this 8th day of February 1893
H. B. BARLOW & GILLETT,
Agents for Applicant.
COMPLETE SPECIFICATION.
Improvements in Gas and similar Motor Engines.
1, ALFRED ROWE BELLAMY, of Algoa Lodge, Adswood Lane, Stockport, in
the County of Chester, Engineer, do hereby declare the nature of my invention
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 and similar motor engines, and
particularly to those which have the "Otto " cycle of operations or a similar
cycle.
The chief object of my improvements is to reduce the terminal pressure of the
effective stroke without reducing the initial pressure of the explosive fluid
mixture.
'
I accomplish this object by the improved cycle hereinafter described with
reference to the accompanying sheet of drawings in which
Figure 1 is a sectional plan of the power cylinder and certain other parts of a
gas or similar motor engine.
Fig. 2 is an end sectional elevation of the same and
Figs. 3 and 4 are diagrams illustrating my improved cycle.
In Figs. 1 and 2,-a denotes the piston, 6 the power cylinder, c the air inlet

page_text: valve, da small pump cylinder, e the gas admission valve to the pump cylinder d,
the pump piston, its piston rod, g a second crank shaft, hi toothed wheels,
j the main crankshaft, k the valve controlling the admission of gas to the power
cylinder b, the exhaust valve, the ignition valve (not shown) may be such as used
on the "Stockport" gas engine, and m is the side shaft from which the several
valves are operated.
The following is the improved cycle of operations- .
First stroke. The piston a during its outstroke draws into the cylinder
the air inlet passage controlled by the valve e a full charge of air.
from
Second stroke. The piston a during a portion of its instroke expels through the
air valve c or exhaust valve part of the air drawn in during the first stroke, and
during the remainder of its instroke (while the valve c is closed) compresses the
air, and an injected charge of gas or hydrocarbon vapour. In the arrangement
shown in Figs. 1 and 2 this injection is effected by means of the piston f of the
small pump cylinder d which is in communication by means of a passage d' with
the gas supply and also the gas inlet of the cylinder b, the admission of gas to the
cylinder being controlled by the valve k and the piston being operated by
the second crankshaft g which is driven by the gears hi from the main crankshaft j
to which the piston rod a' of the piston a is coupled.
1
Third stroke. This is the working or effective stroke the charge compressed
during the latter part of the second stroke being ignited and the piston a thereby
impelled outward.
Fourth stroke. The products of combustion are expelled through the exhaust
valve by the instroke of the piston a.
The above series of operations constitutes the improved cycle.
The charge of gas or hydrocarbon vapour is injected into the cylinder 6 during
the instroke of the piston a as mentioned above under the second head, whilst
the exhaust and air admission valves are closed and the valve k is open and the
injection may be effected by a pump as shown or by means of any other suitable
appliance worked by the engine or otherwise as convenient.
Although I have shown and described my improvements as applied to a single
acting engine it will be readily understood that the improved cycle is equally
applicable to double acting engines.
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 :-
:-
In a gas or similar motor engine-
1. The improved cycle of operations consisting first in an outstroke during which
the piston draws into the cylinder a full charge of air secondly in an instroke
during a portion of which the piston expels part of the air previously drawn in
and then compresses the remaining air and an injected charge of gas, or hydro-
carbon vapour, thirdly an outstroke which is the effective or working stroke
following the ignition of the compressed charge and fourthly an instroke during
which the products of combustion are expelled all substantially as and for the
purposes herein set forth.
2. The combination with the power cylinder and its piston, of a pump or similar
appliance for injecting into the power cylinder a charge of gas or hydrocarbon
vapour during the second or compressing stroke of the power piston substantially.
as and for the purposes herein described with reference to the accompanying
drawings.
Dated this 8th day of November 1893
H. B. BARLOW & GILLETT,
17, St. Ann's Square, Manchester, Agents for Applicant.