Improvements in or relating to Admission Valves for Petroleum or similar Motors.
Year: 1893

page_text: Date of Application, 22nd Apr., 1893-Accepted, 10th June, 1893
COMPLETE SPECIFICATION.
Improvements in or relating to Admission Valves for Petroleum or
similar Motors.
I, JOHN THEODOR LINDAHL, Engineer, of Brahegatan No. 2 Stockholm, in
the Kingdom of Sweden, 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 :---
This invention relates to the admission valves of motors driven by petroleum or
other motive agent its object being to facilitate the exact control of the quantity
of oil supplied to the motor.
In the accompanying drawings
Fig. 1 is a side view and Fig. 2 a top view of a valve constructed according to
this invention.
Fig. 3 is a section on the line A-B of Fig. 1, and
Fig. 4 is a section showing a modification of part of the valve.
The interior of the valve-box a communicates by means of a pipe screwed into
an opening a¹ with an oil reservoir. The valve-box encloses the part 6 which by
means of screws is pressed against a cross-piece 61 connecting the valve-box with
the chamber d in which the vaporization of the oil takes place. From the part 6 a
sleeve g projects into the valve-box. In this sleeve is placed the valve-spindle f
with the valve-head or valve proper at its one end and with an arrangement for
regulating the supply of oil at its other end. In the valve-seat against which the
valve rests, there is a groove 9 all round communicating with the atmospheric air
through a channel r. The groove may instead be made in the valve. By this
arrangement the valve will have two valve-seats s and t one at some distance from
the other. When the valve is closed the access of air is intercepted by the seat t
situated nearer than s to the motor, while the other seat s intercepts the access of
oil. The valve-spindle is filed somewhat flat all along one side, so that a channel o
with a small area leads through the sleeve g and forms the communication between
the interior of the valve-box a and the valve h. When the latter owing to suction
from the cylinder, moves inwards oil as well as part of the requisite quantity of air
will, by the suction be drawn in and caused to enter the vaporizing chamber d.
The further quantity of air required for obtaining a suitable explosive mixture is
sucked into the cylinder through a special air-valve placed on the cylinder near the
vaporizing chamber.
The quantity of oil sucked in is determined by means of the above-named
arrangement at the outer end of the spindle consisting of a screw spindle
traversing a nut m screwed into a stuffing box. The spindle at one end is provided
with a button n by means of which it may be turned and at its other end with a
head engaging with a bow or yoke i fixed to the valve-spindle. By screwing the
spindle more or less into the valve-casing a, the valve may be caused to move a
longer or shorter distance from the seat and thus the supply of oil may be regulated
according to requirements. The spindle may also be used for causing the motor
to stop.
If desired the regulating device may be left out and the stroke of the spindle
may be regulated once for all by means of a stop plate fixed to the end of the
valve-spindle f which stop-plate strikes against the sleeve g. In this case the
channel r, through which the air gets into the groove q has to be provided with a
cock by means of which the quantity of air admitted may be regulated.
A helical spring u acting upon the bow i or upon the above named stop plate
tends to hold the valve against the two seats.

page_text: Behind the valve-seats there may be made a groove p so that the oil may enter
all around the valve.
Fig. 4 represents a modification in which to each of the valve-seats t and s is
fitted a separate valve and with their respective spindles f¹ and f2. The
spindle of the valve h¹ which prevents the admission of air when tight against
the valve-seat t, is movable inside the spindle of the other valve. In the spindle f¹
there is an oblong hole or slot traversed by a pin fixed to the spindle against
which pin when the valve his approaching the motor, will bear the outer end of
the slot just mentioned, with the effect that the valve-head 2 at the continued
motion of the valve-head is withdrawn from its seat, thus permitting the oil to
flow in.
The valve-spindle f is provided with a regulating arrangement or a stop plate
and is actuated by a spiral spring like the valve-spindle in the valve first
described.
The reason for placing an air inlet in connection with the oil inlet is to obtain a
comparatively long stroke of the valve or valves; the length of the stroke and
consequently the oil supply can thus be regulated with the greatest exactitude, the
closing of the valve being besides more sure, as impurities contained in the oil can
pass easier between the valve and valve-seat.
The inventor is well aware that some gas motors are provided with valves the
construction of which present certain resemblance to the arrangements above
described, which however are based upon quite different principles. The object of
these former arrangements is either to regulate the supply of the whole quantity
of air and gas requisite for each explosion or merely to effect a mixture of the
gases before entering the cylinder or both these objects combined, whereas this
invention relates only to the regulation of the supply of oil, which regulation is
effected by allowing an insignificantly small quantity of air to be drawn in along
with the oil.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is,
1. In feeding or admission valves for petroleum motors into which the petroleum
and the air are sucked in through different independent valves and thus enter the
motor separately the arrangement of the petroleum-valve with a groove such as q
in the valve or valve seat dividing the valve or valve seat into two parts the groove
communicating by means of a channel such as r with the atmospheric air with the
object that at the suction a small quantity of air may be sucked in in addition to
the required quantity of petroleum by increasing the stroke of the valve whereby
an increased facility of regulating the supply of petroleum is obtained substantially
as and for the purpose described.
2. A modification of the valve claimed in Claim 1 in which the spindle of the
air-valve is movable inside the spindle of the valve for controlling the supply of
petroleum or the like the seats of these two valves constituting or taking the place
of the valve seats separated in the other arrangement (Figures 1 and 3) by the
groove 9 and the two spindles sliding one within the other and being connected by
means of a pin fixed to the outer spindle and traversing a slot in the inner spindle
or vice versa so that when there is suction from the motor-cylinder first the air and
then the petroleum is admitted.
W. P. THOMPSON & BOULT,
Of London, Nottingham, Manchester, and Liverpool,
Agents for the Applicant.