Improvements in Valve Gear for Gas or Oil Engines.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in Valve Gear for Gas or Oil Engines.
1, CHARLES WOOD, Engineer, of 22, Bridgewater Square, London, E.C. do
hereby declare the nature of this invention to be as follows:-
My invention relates to valve gear for gas and oil engines, and my object is to
produce a very simple valve gear with the minimum number of operating parts.
My invention consists in a method of actuating the air inlet, gas inlet and
exhaust valves from the motion of one crank pin or eccentric, the motion for
the valves being taken from a rod operated by the said crank pin or eccentric.
In carrying my invention into effect according to one modification, I arrange
upon the crank shaft a pinion which gears into a spur wheel of double the number
of teeth. In the face of this spur wheel I provide a crank pin, and I connect the
crank pin to a lever operating the way shaft by means of a connecting or like rod.
The way shaft carries at the other end a second lever, which lever actuates an
exhaust valve of the usual lift type, which valve is brought to its seat by means of
a spring of usual arrangement.
The end of the link connecting the crank pin and the way shaft lever oscillates
in an arc to and fro. At a distance from the point of junction to the way shaft
lever on the said link I place a suitable cam surface. This cam surface moves in
an irregular ellipse, and on one stroke the cam wipes a roller attached to another
lever, which lever operates the air inlet valve and also the gas inlet valve. The gas
inlet valve is actuated from the said second lever by a knife edge controlled by an
inertia governor, and the air inlet valve is operated from the said lever by means
of a screw-adjusted pin.
This particular combination enables the one motion obtained from the crank pin
in the two to one spur wheel to accomplish both the opening of the exhaust valve
and the actuating of the gas and air valves. The motion for the gas and air valves
is more or less at right angles to the motion actuating the exhaust valve, and the
cam which lifts the valves on one stroke misses the roller on the return stroke,
because the cam position falls below on the return movement.
By this device I am enabled to operate an engine very simply without any
complexities in the gear.
I do not confine myself to the use of a way-shaft for the exhaust valve, but
may so arrange my engine as to combine all the valves on one side of the engine
close to each other.
MARKS & CLERK,
18 Southampton Buildings, London, W.C., and
13 Temple Street, Birmingham, Agents for the Applicant.

page_text: Improvements in Valve Gear for Gas or Oil Engines.
1, CHARLES WOOD of 22 Bridgewater Square, London, E.C., 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:-
My invention relates to valve gear for gas and oil engines, and my object is to
produce a very simple valve gear with the minimum number of operating parts.
My invention consists in a method of actuating the air inlet, gas inlet and
exhaust valves from the motion of one crank pin or eccentric, the motion for the
valves being taken from a rod operated by the said crank piu or eccentric.
Referring to the accompanying sheet of drawings which illustrates one method
of carrying my invention into effect, Figure 1 is a longitudinal elevation part
section of an engine fitted with my valve gear. Figure 2 is a transverse section on
the line y Figure 1 and Figure 3 is a plan, while Figure 4 is an alternative
arrangement corresponding to Figure 1.
In carrying my invention into effect according to one modification I arrange
upon the crank shaft A. a pinion B which gears into a spur wheel C of double the
number of teeth. In the face of this spur wheel I provide a crank wheel pin D,
and I connect the crank pin to a lever E operating the way shaft F by means of a
connecting link or rod G. The way shaft carries at the other end a second.
lever H, which lever actuates an exhaust valve I, of the usual lift type, which
valve is brought to its seat by means of a spring of usual arrangement.
The end of the link G connecting the crank pin D and the way shaft lever E
oscillates in an arc to and fro. At a distance from the point of junction to the way
shaft lever on the said link I place a suitable cam surface J. This cam surface
moves in an irregular ellipse, and on one stroke the cam wipes a roller K attached
to another lever L, which lever operates the air inlet valve M, and also. the
gas inlet valve N, the link G may however positively operate the lever L by
means of a link L' as illustrated in Figure 4. The gas inlet valve is actuated
from the said second lever L by a knife edge O controlled by an inertia
governor P, and the air inlet valve is operated from the said lever by means of
a screw-adjusted pin Q.
This particular combination enables the one motion obtained from the crank pin
in the two to one spur wheel C to accomplish both the opening of the exhaust
valve I and the actuating of the air and gas valves respectively M and N. The
motion for the gas and air valves is more or less at right angles to the motion
actuating the exhaust valve, and the cam J which lifts the valves on one-stroke,
misses the roller K on the return stroke because the cam position falls below on
the return movement.
By this device I am enabled to operate an engine very simply without any
complexities in the gear.
I do not confine myself to the use of a way shaft for the exhaust valve, but may
so arrange my engine as to combine all the valves on one side of the engine close
to each other.
My invention is intended for application to "Otto" cycle gas and oil engines,
and the engine I have described is an "Otto" cycle engine in which a is the
crank, b the connecting rod, and c the piston, while d is the fly-wheel. These
parts do not require special description as the "Otto" cycle is thoroughly well
known.

page_text: 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
Valve gear for an "Otto" cycle gas engine comprising a pinion on the crank
shaft operating a spur wheel with twice the number of teeth, the said spur wheel
carrying a crank pin, and operating a lever actuating the exhaust valve; a link
connecting the small crank pin and the lever, a cam upon the said link actuating
a second lever, which second lever controls the gas and air inlet valves substantially
as described.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., Agents.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., Agents.