Improvements in the Working of Internal Combustion Engines.
Year: 1899

page_text: Date of Application, 31st Aug., 1899
Complete Specification Left, 28th May, 1900-Accepted, 30th June, 1900
PROVISIONAL SPECIFICATION,
Improvements in the Working of Internal Combustion Engines.
We, BENJAMIN HOWARTH THWAITE, of 29, Great George Street, Westminster,
Civil Engineer, and HOLBYRRY MENSFORTH, of 82, Wheatly Mount, Bradford,
Yorkshire, Mechanical Engineer, do hereby declare the nature of this invention
to be as follows:-
:-
This invention relates to improvements in the working of internal combustion
motors, and is especially applicable to those motors where the gas used 18 of
low calorific value, such as is, for instance, blast furnace gas.
Near the end of the exhaust stroke of an engine working on the Otto cycle,
we introduce a current of air under moderate pressure which may be obtained from
the air blast mains of nou blast furnaces or from an an compressor
This air
flushes out the products of combustion from the cylinder and occupies the com-
bustion chambei forming, with such additional an as is drawn in during the
charging stroke, the an necessary to support the combustion of the next charge.
In order to obtain a sufficient supply of an in close proximity to the cylinder,
we provide flexible air vessels like those used in the gas supply and chaige them
during the period of the cycle so as to be ready to deliver then contents towards
the end of the exhaust stroke.
The pressure of the air in the flexible vessels may be increased by a temporary
compression effected by the engine at the proper time
A check valve is preferably employed to prevent passage of fluid from the
cylinder to the flexible air vessels
Dated this 31st day of Angust 1899
ABEL & IMRAY,
Agents for the Applicants
COMPLETE SPECIFICATION.
Improvements in the Working of Internal Combustion Engines.
We, BENJAMIN HOWARTH THWAITE, of 29, Great George Street, Westminster,
Civil Engineer, and HOLBERRY MENSFORTH, of 82, Wheatly Mount, Bradford,
Yorkshire, Mechanical 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 improvements in the working or internal combustion
motors, and is especially applicable to those motors where the gas used is of
low calorific value, such as is, for instance, blast furnace gas.
Near the end of the exhaust stroke of an engine working on the Otto cycle,
ги

page_text: we introduce a current of air under moderate pressure
This air flushes out the
products of combustion from the cylinder and occupies the combustion chamber
forming, with such additional air as is drawn in during the charging stroke, the
air necessary to support the combustion of the next charge.
For the purpose of introducing the air we provide a special valve and inlet
to the combustion chamber of the cylinder, the valve being operated by a cam by
which it is opened at the proper time admitting air at moderate pressure so as to
scour out the exhaust gases, this air remaining in the cylinder and forming part
of the succeeding charge.
Figs 1 and 2 of the accompanying drawings are sections on planes at right
angles to each other shewing the ordinary air admission valve and the additional
air valve according to our invention, applied at the end of a gas motor cylinder
a 18 the ordinary valve shaft which revolves at half the speed of the crank
shaft, and has on it the usual cams (not shown) for opening the exhaust valve b
and the gas valve Besides these cams we fix on the shaft a another cam c the
face of which acts on a 1oller & mounted on the arm of a rocking shaft e which
has another arm f under the stem of a valve g. Under this valve is an inlet from
a pipe communicating with a supply of air under moderate pressure just above
that of the contents of the cylinder in the last portion of the exhaust stroke
When the engine is worked by the gases from a blast furnace, the pipe h may
be a branch from the blast pipe In other cases, the pipe h may communicate
with the discharge of a pump or other compressor, such as a flexible bag, worked
by the engine
Above the valve g there is a lateral inlet into the combustion
chamber of the cylinder Besides the air sent into the cylinder on opening the
valve g, air also enters, duing the suction stroke, by the inlet I, and gas enters
by the inlet m, the mixture passing the ordinary inlet valve n, this mixture along
with the air admitted by the valve g, forming the combustible charge.
In order more effectually to clear the products of combustion out of the cylinder,
a port may be provided at the front end of the cylinder in such a position as to be
uncovered by the piston just before it completes its outstroke, and so to form an
additional outlet for products of combustion besides the outlet afforded by the
opening of the exhaust valve in the usual way.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim 18.-
1 The improvement in the working of internal combustion engines which
consists in scouring the products of combustion out of the cylinder by means of
au under somewhat higher pressure admitted to the cylinder during the latter
part of the exhaust stroke
2 For operating as above set forth a valve and port opening into the cylinder
and a cam on the valve shaft with connections for opening the valve, substantially
as described
3 For obtaining in a gas engine worked by blast furnace gas a charge of higher
calorific value than has hitherto been obtained, the utilisation of the air pressure
of the furnace blast for scouring the residual combustion gases from the cylinder,
substantially as described
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