An Improved Valve Arrangement for Four-stroke, Gas, Petroleum, and like Motors.
Year: 1898

page_text: Date of Application, 9th Nov., 1898-Accepted, 17th Dec., 1898
COMPLETE SPECIFICATION.
An Improved Valve Arrangement for Four-stroke, Gas, Petroleum,
and like Motors.
A
communication by THE GESELLSCHAFT
FÜR
AUTOMOBILWAGENBAU,
GESELLSCHAFT. MIT BESCHRÄNKTER HAFTUNG, of Nuremberg, in the
Empire of Germany, Manufacturers.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street, Manchester, both
in the County of Lancaster, 118, New Street, Birmingham, in the County of
Warwick, and 322, High Holborn, in the County of Middlesex, Civil 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 suction and discharge valves in the ordinary four-stroke motors operated
by gas, petroleum, benzine or the like are as a rule so arranged that the com-
pression space of the working cylinder has a considerably large deleterious space.
This drawback has not only the result of considerably reducing the working
degree of the motor but may also produce numerous other interruptions in the
working, delay in ignition and the like.
The present invention seeks to remove these drawbacks by an improved
arrangement of the valves and the distributing gear by means of which the
deleterious space in the compression chamber is considerably reduced and may be
in fact almost caused to disappear.
For this object the suction and discharge valves are arranged in one plane
vertically to the axis of the cylinder in such a way that their centre lines dividing
the cylinder axis form a right angle with one another. This arrangement of
valves forms in itself a means for shortening as far as possible the length of the
compression chamber particularly in the case where the valve plane lies close to
the end of the cylinder. In order however to still further diminish the deleterious
space, the valve springs are not arranged inside the cylinder casing but the valve
levers on both sides are connected with one another by means of a single spring
located outside the cylinder casing in such a way that by the power of the said
spring both valves are pressed on their seats and by this means also the valve
springs are no longer exposed to the high temperature ruling inside the working
cylinder so that the security of working is considerably increased.
A motor of this kind is shown in the accompanying drawings in
Figures 1 and 2 provided with valves arranged in the compression chamber,
Figure 1 being a section of the compression chamber with the valves;
Figure 2 an elevation, whilst
Figure 3 is a plan view on an enlarged scale of a stationary motor with a form
of construction of the improved arrangement.
The suction valve 1 and the discharge valve 2 of the motor are arranged in one
plane standing vertically to the cylinder axis 3 and open into the compression
D

page_text: chamber 5 which is located at the rear end of the working cylinder 6. The valve
plane 4 is, as shown in Figures 1 and 2, placed as near as possible to the end of
the working cylinder 6 so that the compression chamber 5 discharges quickly.
The central lines 7 and 8 of the valves cut one another as shown in Figure 3 in
the axis of the cylinder and form with one another a right angle. At the
upper end of the valve spindles 9 and 10, double armed valve levers 11 and 12
respectively engage, the fixed pivots of which are formed by the axes 13 and 14
respectively and their free ends have tapering pieces 15 and 16. The latter are
connected with one another by means of a spring 17, by the power of which there-
fore both the valves 1 and 2 are pressed on their seats. The valves are operated
by a cam disc 19 keyed on the shaft 18, which cam disc acts alternately on
rollers 21 and 22 mounted on the valve levers 11 and 12, the action taking place
by means of cam projections 20, and thus the valves 1 and 2 are alternately-
opened each time overcoming the resistance of the spring 17. The length of the
double levers 11 and 12 may also, as seen in Figure 3, be so calculated that
the spring 17 acts with a greater leverage on the discharge valve 2 than on the
suction valve 1 and consequently presses the former more strongly on its seat
such as is necessary for a regulated working of the motor.
The mounting of the shaft 18 and the two axes of rotation 13 and 14 may, as
shown in Figure 3, be produced by means of a bracket 23 cast on the valve
casing 24 of the suction valve 1. Any heating of the said bearings resulting
from the valve casing is thus not to be feared as the suction valve always has a
temperature which admits of the lubrication of the axes in question.
The single valve spring 17 is also no longer exposed to the high temperature
ruling in the working cylinder so that any breaking of the same need not be
feared.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as communicated to
me by my foreign correspondents, I declare that what I claim is ;-
1. A four-stroke motor for gas, petroleum, benzine and the like, characterized
by the suction valve and the discharge valve (1 and 2) being arranged at right
angles to one another in a plane standing vertical to the axis (3) of the cylinder,
with the object of diminishing the deleterious space existing in the compression
chamber, said valves being adapted to be governed or actuated by a cam disc (19)
lying in the same plane, substantially as herein before set forth.
2. A form of construction of the four-stroke motor hereinbefore described,
characterised by the valve spring being arranged outside the working cylinder
with the object of further diminishing the deleterious space, and by said spring
being formed as a single spring (17) connecting the ends of the valve levers (11
and 12) with one another and consequently pressing both valves (1 and 2)
simultaneously on their seats, substantially as hereinbefore described.`
T 10+ day of Noromban 1808