Improvements in Hydrocarburetted-air Engines.
Year: 1891

page_text: Date of Application, 7th Mar., 1891
Complete Specification Left, 2nd Jan., 1892-Accepted, 6th Feb., 1892
PROVISIONAL SPECIFICATION.
Improvements in Hydrocarburetted-air Engines.
We, WILLIAM DENT PRIESTMAN and SAMUEL PRIESTMAN, of Holderness
Foundry, in the Town and County of Kingston-upon-Hull, Directors of Priestman
Brothers, Limited, Mechanical Engineers, do hereby declare the nature of this
invention to be as follows:-
In motor engines operated by the combustion of hydrocarbon vapour or hydro-
carburetted air and in which the combustion of the working charge takes place in
the motor-cylinder, it is usual to form or provide the cylinder beyond the portion
traversed by the motor-piston with a chamber or pocket into which the working
charge is compressed before being ignited. The motor-cylinder is furnished with a
water-jacket for cooling purposes, and this jacket is sometimes extended so as to
embrace not only the portion of the cylinder traversed by the piston but also
the chamber or pocket above referred to as lying beyond that portion of the
cylinder.
In motor engines of the class to which the present invention relates, and particu-
larly those in which the inflammable charge consists of air permeated with liquid
hydrocarbon, it is found advantageous to heat the charge before igniting it. This
is usually effected by subjecting the inflammable mixture, enclosed in a suitable
vessel, to the heat of the exhaust gases which escape from the motor-cylinder.
Our invention consists in the application to the motor-cylinder and to its terminal
chamber of two jackets; that surrounding the portion of the cylinder traversed by
the piston being employed for the reception of the circulating water in the usual
manner, whilst that surrounding the terminal chamber or pocket is utilised for the
reception of the inflammable mixture prior to its admission to the said chamber to
form the working charge. Whilst enclosed in the jacket last referred to, the
inflammable mixture is exposed to the intense heat generated by the combustion
which takes place within the chamber; a portion of this heat being utilised for the
purpose of heating the next incoming charge of inflammable mixture, instead of
being absorbed and conveyed away by the circulating water, as would be the case
were the water-jacket extended so as to embrace the terminal chamber or pocket as
well as the motor-cylinder proper.
The jacket in which the inflammable charge is heated in the manner above
described may assume the form of an annular cavity projecting either longitudinally
or transversely within the terminal chamber or pocket of the motor-cylinder.
Under such circumstances, both sides of the annular cavity are exposed to the
action of the heated gases generated by the explosion of the working charge;
the heating surface and consequently the heating effect being correspondingly
increased.
Dated this 5th day of March 1891
G. G. M. HARDINGHAM,
191, Fleet Street, London, E.C., Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Hydrocarburetted-air Engines.
We, WILLIAM DENT PRIESTMAN and SAMUEL PRIESTMAN, of Holderness
Foundry, in the Town and County of Kingston-upon-Hull, Directors of Priestman
Brothers, Limited, Mechanical Engineers, do hereby declare the nature of this
[Price 8d.1

page_text: invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement :—
In motor engines operated by the combustion of hydrocarbon vapour or hydro-
carburetted air, and in which the combustion of the working charge takes place in
the motor-cylinder, it is usual to form or provide the cylinder beyond the portion
traversed by the motor-piston, with a chamber or pocket into which the working
charge is compressed before being ignited. The motor-cylinder, is furnished with
a water-jacket for cooling purposes, and this jacket is sometimes extended so as to
embrace not only the portion of the cylinder traversed by the piston but also the
chamber or pocket above referred to as lying beyond that portion of the cylinder.
In motor engines of the class to which the present invention relates, and particu-
larly those in which the inflammable charge consists of air permeated with liquid
hydrocarbon, it is found advantageous to heat the charge before igniting it.
is usually effected by subjecting the inflammable mixture, enclosed in a suitable
vessel, to the heat of the exhaust gases which escape from the motor-cylinder.
Our invention consists in the application to the motor-cylinder and terminal
chamber of a hydrocarbon engine of two jackets as represented in the accompanying
diagrams;
This
Fig. 1 being a longitudinal section through the motor-cylinder and combustion
chamber and
Fig. 2 a similar view shewing a modification.
The motor-cylinder A and its terminal chamber A' are provided with two
jackets B and B₁; the former serving for the reception of water which is circulated
about the cylinder for cooling purposes, whilst the latter is utilised for the reception
of the inflammable mixture, whereof the working charge is composed, prior to its
admission to the combustion-chamber A¹. Whilst enclosed in the jacket B¹, the
inflammable mixture is exposed to the intense heat generated by the combustion
which takes within the chamber A', a portion of this heat being utilised for the
purpose of heating the next incoming charge of inflammable mixture, instead of
being absorbed and conveyed away by the circulating water, as would be the case
were the water-jacket B extended so as to embrace the terminal chamber or
pocket A as well as the motor-cylinder A.
The jacket B' may assume the form of an annular cavity projecting longitudinally
within the terminal chamber or pocket A¹, as represented in Fig. 2.
Or the
pocket A¹ may extend in a radial direction. In either case, both sides of the annular
cavity are exposed to the action of the heated gases generated by the explosion
of the working charge; the heating surface and consequently the heating effect
being correspondingly increased.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, we claim :-
:-
1. In a hydrocarburetted air engine, separating the cylinder jacket into two
compartments, that surrounding the portion of the motor-cylinder traversed by the
piston serving for the reception of the liquid circulated for cooling purposes, whilst
that subtending the combustion chamber is utilised for the reception and heating of
the inflammable mixture prior to its admission to the said chamber.
2. In a hydrocarburetted air engine, the combination, with the motor-cylinder A.
and combustion chamber A', of a jacket constructed in two separate compart-
ments B, B'; the former surrounding the portion of the motor-cylinder which is
traversed by the piston, and the latter embracing the space which lies beyond and
forms the combustion chamber, substantially as and for the purposes herein set
forth.
Doted th: ool
G. G. M. HARDINGHAM,
191, Fleet Street, London, E.C., Chartered Patent Agent.