Year: 1897

page_text: I, HERBERT CHURCHILL CAPEL, of 168, Dalston Lane, London, N.E., Engineer,
do hereby declare the nature of this invention to be as follows:-
-
The object of my invention is to diminish the capacity of the chamber between
the exhaust valve & the cylinder of gas engines, with the result that the engine will
work more economically without the disadvantages attendant on the use of loose
valve seat bushes. For this purpose the valve seats of the exhaust & admission
valves are cast in one with the explosion chamber casing with ports projecting
through the water jacket space, so that the valve seats are about in a line with
the bottom of the interior of the cylinder. A suitable opening & cover is provided
in the explosion chamber casing opposite the valves for the purposes of machining
the valve seats & inserting & removing the valves. It will be readily understood
that as the valve seats project through the water jacket, the walls of the ports being
directly in contact with the cooling water said valves will be kept cool by the
circulating water & will consequently last much longer than if loose bushes
are used.
Deted this 15th day of June 1897.
G. T. HARRAP,
Agent for Applicant.
I, HERBERT CHURCHILL CAPEL, of 168, Dalston Lane, London, N.E., 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:-
The object of my invention is to diminish the capacity of the chamber between
the exhaust valve and the cylinder of gas engines by doing away with the port
usually placed between the said valve and cylinder, so as to reduce the cooling
surface exposed to the hot gases to a minimum, without the disadvantages hitherto
introduced when this has been done by the use of loose valve seat bushes: also to
facilitate the removal of the valves, and improve the general arrangement of parts
on the end of cylinder, so that the highest efficiency and best practical results
may be obtained with the greatest simplicity.
In order that my invention may be more readily understood I have caused to be
attached hereto a sheet of drawings in which Figure 1 is a longitudinal section
of the end of a cylinder and Figure 2 is a cross section of the same on the line ab.
CD 011

page_text: A is the exterior jacket casting. In this is fitted the cylinder or liner B. The
space between them forms the water jacket C. This water jacket also nearly
surrounds the combustion chamber F, which is part of the jacket casting A.
Water circulates freely through this jacket, the cooler water flowing in through the
inlet D, and the heated water flowing out through the pipe E in the usual well
known manner.
From the bottom of the combustion chamber F, lead two ports H & L through
the water jacket C, each is covered in the combustion chamber by a mushroom
valve, with seats G & K machined in the main casting A, and with stems guided in the
renewable bushes T & U.
The port L with its valve M is used for the exhaust outlet, and the port H
with its valve J is used for the gas and air inlet. The bush T is extended at its
upper end to form an annular space V, which the gas enters through the port W
and leaves through small holes ✗, round the top of the bush, mixing thoroughly
with the air as it enters the cylinder, this mixing action being continued afterwards
by the flattened shape of the combustion chamber as shewn in Figure 2.
A suitable opening with cover and plug N, is provided in the jacket casting A,
directly above the valves J and M, for the purpose of machining the valve seats and
readily removing the valves when required.
By this invention it will be evident that the cold water entering the water
jacket immediately flows all round the exhaust port L, and as the valve seat K is in
unbroken metallic contact with the full body of the cold circulating water and very
close to it, the seat is kept cool and not readily burnt away by the action of the
heated exhaust gases passing over it. The various parts are exceedingly simple
and accessible, whilst the greatest economy in gas consumption is obtained, because
the hot gases during combustion are exposed to the minimum area of cold surface.
It will be readily understood that this invention is applicable to all types of
internal combustion 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:
1. In a gas or internal combustion engine the combination of inlet and exhaust
valves having seatings in unbroken metallic contact with the circulating cooling
water, together with one plug and cover opposite said valves as and for the
purposes herein described.
2. In a gas or internal combustion engine, the combination of inlet and exhaust
valves having seatings in unbroken metallic contact with the circulating cooling
water, together with one plug and cover opposite, which enables both valves to be
removed through the one opening and with renewable bushes to the valves, as and
for the purposes herein described.
3. In a gas or internal combustion engine the combination of inlet and exhaust
valves, having seatings in unbroken metallic contact with the circulating cooling
water, together with plug and cover and with renewable bushes to the valves, all
substantially as hereinbefore described and illustrated in the accompanying
drawing.
D
T
1
L 1900
G. T. HARRAP,
Agent for Applicant.