Improvements in and connected with Gas, Oil, and other Internal Explosion Engines.
Year: 1898

page_text: Date of Application, 27th Oct., 1898
Complete Specification Left, 27th July, 1899-Accepted, 2nd Sept., 1899
PROVISIONAL SPECIFICATION.
Improvements in and connected with Gas, Oil, and other Internal
Explosion Engines.
I, JOHN LEWIS WILES, of 82, Mark Lane, in the City of London, in the County
of Middlesex, Gentleman, do hereby declare the nature of this invention to be
as follows:
This invention relates to internal explosion engines working on the " Otto"
cycle and the object thereof is to give the piston an extra length of stroke at,
every other revolution of the crank shaft.
In gas oil and similar engines as usually constructed there is a space of from
half an inch to three quarters of an inch between the piston when at the end of
the inward stroke and the end of the cylinder into which space the explosive
mixture is compressed on the compression stroke. This space is also left at
the end of the exhaust stroke and the products of combustion are not completely
discharged from the cylinder but a portion of the bye-products remain in the
cylinder and mix with the fresh charge of explosive mixture. This defect I
remedy by giving the piston a longer travel on the exhaust stroke than on the
compression stroke so that there is little or no clearance between the piston and
cylinder end at the termination of the exhaust stroke.
Now according to this invention I place an excentric sleeve on the crank pin
and the large end of the connecting rod embraces this sleeve instead of the
crank pin. A spur wheel is keyed or otherwise secured to the said sleeve which
is free to rotate on the crank pin which wheel gears with a spur wheel keyed
or otherwise secured to a shaft passing through the centre of the crank shaft
which is made hollow on one side of the crank for this purpose this latter wheel
being fixed and incapable of rotation.
The diameter and number of teeth of the wheels are so proportioned as to
rotate the excentric sleeve on the crank pin once during every two revolutions
of the crank shaft so that the excentric sleeve has its excentricity directed towards
the cylinder on the exhaust stroke and towards the crank shaft on the compres-
sion stroke thus giving the desired increased stroke to the piston every other
revolution. Or to effect the same object namely diminution of the clearance on
the exhaust stroke I may keep the stroke of the main piston uniform and insert
a second piston in the cylinder behind the main piston the second piston being
moved forward during the exhaust stroke and drawn backwards during the com-
pression stroke.
This movement may be made by means of a suitable cam it being necessary
only to move the piston forward the pressure of the explosive mixture during
compression being generally sufficient to move the second piston to the end of
the cylinder.

page_text: Improvements in and connected with Gas, Oil, and other Internal
Explosion Engines.
I, JOHN LEWIS WILES, of 82, Mark Lane, in the City of London, in the County
of Middlesex, Gentleman, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
This invention relates to internal explosion engines working on the "Otto"
cycle and the object thereof is to give the piston an extra length of stroke at
every other revolution of the crank shaft.
In gas oil and similar engines as usually constructed there is a space of from
half an inch to three quarters of an inch between the piston when at the end of
the inward stroke and the end of the cylinder into which space the explosive
mixture is compressed on the compression stroke. This space is also left at
the end of the exhaust stroke and the products of combustion are not completely
discharged from the cylinder but a portion of the bye-products remain in the
cylinder and mix with the fresh charge of explosive mixture. This defect I
remedy by giving the piston a longer travel on the exhaust stroke then on the
compression stroke so that there is little or no clearance between the piston and
cylinder end at the termination of the exhaust stroke.
Now according to this invention I place an excentric sleeve on the crank pin
and the large end of the connecting rod embraces this sleeve instead of the
crank pin. A spur wheel is keyed or otherwise secured to the said sleeve which
is free to rotate on the crank pin which wheel gears with a spur wheel keyed
or otherwise secured to a shaft passing through the centre of the crank shaft
which is made hollow on one side of the crank for this purpose this latter wheel
being fixed and incapable of rotation.
The diameter and number of teeth of the wheels are so proportioned as to
rotate the excentric sleeve on the crank pin once during every two revolutions
of the crank shaft so that the excentric sleeve has its excentricity directed towards
the cylinder on the exhaust stroke and towards the crank shaft on the compres-
sion stroke thus giving the desired increased stroke to the piston every other
revolution. Or to effect the same object namely diminution of the clearance on
the exhaust stroke I may keep the stroke of the main piston uniform and insert
a second piston in the cylinder behind the main piston the second piston being
moved forward during the exhaust stroke and drawn backwards during the com-
pression stroke.
This movement may be made by means of a suitable cam it being necessary
or to move the piston forward the pressure of the explosive mixture during com-
pression being generally sufficient to move the second piston to the end of the
cylinder and in order that my said invention may be fully understood I will
proceed to explain the same with reference to the accompanying sheet of drawings
in which
Fig. 1 represents section through the cylinder and crank shaft of an internal
explosion engine constructed according to this invention the piston being at
the end of the exhaust stroke.
Fig. 2 is same with piston at end of suction stroke.
Fig. 3 is same with piston at end of compression stroke.
Fig. 4 is same with piston at end of working stroke.
Fig. 5 shews alternative arrangement with a second piston to take the place

page_text: of the wheel rotating on a stud and pinion secured to the crank shaft so as
to move the piston m forward during the latter portion of the exhaust stroke
the said piston being returned to the position shewn by Fig. 5 by the compres-
sion of the mixture or by springs or other suitable means I do not bind myself
to any of the exact details shewn by the drawings as the same may be varied
without departing from the spirit of my invention. For example the piston m
may be positively driven instead of using a cam.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed I declare that what
I claim is -
1. In gas oil and other internal explosion engines varying the inward travel
of the working piston by means of an excentric sleeve on the crank pin which
sleeve is caused to rotate on the said pin once during every two revolutions of
the crank shaft as and for the purpose stated.
2. In gas oil and other internal explosion engines the combination of an
excentric sleeve surrounding the crank pin, a spur wheel attached to or
formed in one with the said sleeve and a pinion j formed in one with or secured
to a shaft passing through the crank shaft and prevented from rotating by
being secured to the engine frame or plummer block to compel the said sleeve
to revolve once round the crank pin while the crank shaft makes two revolutions
substantially as and for the purpose stated.
3. In gas oil and other internal explosion engines the combination with a
piston and connecting rod of an excentric sleeve surrounding the crank pin, the
large end of the connecting rod being connected to the said sleeve and the said
sleeve caused by suitable gearing to make one revolution round the crank pin
while the crank shaft revolves twice for the purposes stated.
4. In gas oil and other internal explosion engines varying the clearance
capacity of the cylinder by means of a supplementary piston actuated by a cam
or other suitable means in combination with the usual piston and connecting rod.
5. Gas oil and other internal explosion engines constructed as shewn by the
accompanying drawings.
.
a
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