IMPROVEMENTS IN GAS-MOTOR ENGINES
Year: 1880

page_text: LETTERS PATENT to Charles Denton Abel, of No. 28, Southampton
Buildings, Chancery Lane, in the County of Middlesex, for an Invention
of "IMPROVEMENTS IN GAS-MOTOR ENGINES." A communication from abroad
by Gottlieb Wilhelm Daimler, of the Gas-motoren Fabrik Deutz, at Deutz on
the Rhine, in the German Empire.
PROVISIONAL SPECIFICATION left by the said Charles Denton Abel at the
Office of the Commissioners of Patents on the 26th January. 1880.
CHARLES DENTON ABEL, of No. 28, Southampton Buildings, Chancery Lane, in
the County of Middlesex. "IMPROVEMENTS IN GAS-MOTOR ENGINES." [A com-
munication from abroad by Gottlieb Wilhelm Daimler, of the Gas-motoren Fabrik
Deutz, at Deutz on the Rhine, in the German Empire.]
This Invention relates to motor engines wherein the piston of the engine cylinder
is actuated by the gaseous pressure resulting from the combustion of a mixture of
air and combustible gas or vapour introduced into the cylinder. The introduction
of such combustible mixture was heretofore mostly effected by means of a slide,
which in engines of large dimensions thus became inconveniently large.
According to the present Invention this inconvenience is obviated by the use of
an arrangement whereby the whole or the greater part of the combustible charge is
admitted into the working cylinder through a separate valve, so that as the slide
only serves to effect the ignition of the charge, or mainly so, it can be made of
smaller dimensions.
For this purpose there is provided in the part formed or fixed on the cylinder
end against which the slide works, a channel or passage into which combustible
gas or vapour enters from the supply pipe. This channel has a port in the cylinder
face which at a certain position of the slide is made to communicate, by means of a
channel or cavity in the face of the latter, with a second port leading into a chamber
in the cylinder end, into which the gas consequently passes, and from which it issues
through a number of small holes into a passage communicating at one end with the
atmosphere, so that the air in passing into such passage mixes with the combustible
gas. Beyond the point where such mixture is effected the said channel divides into
The one branch, which by preference is larger than the other, leads directly
to a lift-valve situated in the supply-passage communicating with the interior of the
cylinder, which valve is opened at suitable intervals for admitting the combustible
two.

page_text: mixture into the cylinder. The opening of this valve is effected by means of a lever
against the action of a spring, the lever being suitably actuated from a moving part
of the engine, such as by the motion of the slide, which at a certain point of its
stroke bears against an adjustable stop on the lever.
The smaller branch of the supply passage communicates with a port in the
cylinder face, which at a certain position of the slide is put in communication, by a
channel or cavity in the latter, with a second port leading into the beforementioned
supply passage of the cylinder, so that a small portion of the combustible charge
also passes into the cylinder through such last named port, which becoming thus
charged with the combustible mixture serves as the igniting port for firing the
charge in the cylinder. The ignition is effected in the usual manner by means of a
small charge of gaseous mixture contained in a cavity in the slide which is ignited
by a stationary gas flame.
Instead of admitting a portion of the combustible charge through the igniting
port, as described, the entire charge may be admitted through the separate valve,
and the charging of the igniting port with combustible mixture may be effected in
any other convenient manner.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Charles Denton Abel in the Great Seal Patent Office on the 22nd
July 1880.
CHARLES DENTON ABEL, of No. 28, Southampton Buildings, Chancery Lane, in
the County of Middlesex. IMPROVEMENTS IN GAS MOTOR ENGINES."
A com-
munication from abroad by Gottlieb Wilhelm Daimler, of the Gas-motoren Fabrik
Deutz, at Deutz on the Rhine, in the German Empire.
This Invention relates to motor engines wherein the piston of the engine-cylinder
is actuated by the gaseous pressure resulting from the combustion of a mixture of
air and combustible gas or vapour introduced into the cylinder.
The introduction of such combustible mixture was heretofore mostly effected by
means of a slide, which in engines of large dimensions thus became inconveniently
large.
According to the present Invention this inconvenience is obviated by the use of
an arrangement whereby the whole or greater part of the combustible charge is
admitted into the working cylinder through a separate valve, so that the slide can
be made of smaller dimensions. For this purpose an arrangement is employed
which is shewn on the accompanying Drawings, in which Fig. 1 shews an end view
of the engine cylinder with valve gear; Fig. 2 shews a vertical section of the rear
end of the cylinder and ports; and Figs. 3 and 4 shew sectional plans taken
respectively on lines X-X and Y-Y, Fig. 1. A is the working cylinder; B, the
inlet passage for the combustible charge. The combustible gas or vapour entering
through the passage c, Figs. 1 and 3, passes thence through opening p, Fig. 2, into
cavity e in the slide d, and thence into the passage through opening o. From
passage f the gas issues through a number of small openings at g into the passage
or mixing chamber h so as to mix intimately with the air entering through the
open lower end of such chamber. The mixture of gas and air passes partly through
the channel h', opening 8, slide cavity r, and igniting port n into the cylinder port B,
while the greater part passes through the channel h² to the underside of the valve i
situated in the port B so as on the opening hereof to issue into the cylinder. The
opening of the valve for this purpose is effected at the proper time from any
convenient moving part of the engine, such as by a bell crank lever k, l, actuated
by the motion of the slide d, as shewn, the closing of the valve being effected by a
spring 9.
The ignition of the charge is effected by a small charge of burning gas in the
cavity m of the slide ignited by a stationary gas jet in the usual manner, and
brought by the motion of the slide in front of the igniting port n. The admission
of the combustible charge is effected when the slide is in the position shewn in
Figs. 3 and 4, when the cavity e of the slide establishes the communication between
openings o and p, while the cavity restablishes the communication between the
openings 8 and n, the valve i being at the same time raised from its seat by means
of the lever k, l, acted upon by the slide d, as shewn in Fig. 1.
In some cases the combustible gas may be made to pass directly from c into
passage f without passing through the slide.
Having thus described the nature of this Invention, and in what manner
the same is to be performed, as communicated to me by my foreign correspondent,
I claim,―
In gas motor engines the herein described double connection of the inlet port B
of the cylinder with the mixing chamber h for gas and air, such double connection
being effected, firstly, by an aperture s, slide cavity r, and igniting port n, and

page_text: secondly, by the valve i, so that the combustible charge is made to enter the
cylinder both through the igniting port n and through the valve i.
In witness whereof, I, the said Charles Denton Abel, have hereunto set my
hand and seal, this Twenty second day of July, in the year of our Lord
One thousand eight hundred and eighty.
CHAS. D. ABEL. (L.S.)