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Патент USA US2123325

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July 12, 1938.
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I
- 2,123,325
ENGINE WITH RADIALLY ARRANGED WORKING CYLINDERS AND PIS‘TON SCAVENGING PUMPS‘,
Filed 001;. 21. 1956
I
I/
2 Sheets-Shget 1
' July 12; 1938.
, -,_ ZEISSL
'
2,123,325
ENGINE WITH RADIALLY“ ARRAI‘K‘IEDv WORKING CYLINDERS AND PISTON SCAVENGI‘NG PUMPSv
Filed Oct. 21, less
2 Sheets-Sheet 2
/n ventor»:
Z @5882
Patented July12,;1938
2,123,325
UNITED STATES- PATENT OFFICE
' 2,123,325
RADIALLY ARRANGED
WORKING CYLINDERS AND PISTON SCAY
ENGINE ‘WITH
ENGING PUMPS
Ignaz Zeissl, Vienna, Austria ‘
Application October 21, 1936, Serial No. 106,881
In Austria October 24, 1935
(Cl. 123—-55)
The known constructions of controlling the these advantages being of particular importance
p
2 Claims.
suction ports of the piston-scavenging of two
stroke engines possess such considerable draw
backs that the slight enlarging of these engine
5 types is connected to a great extent with these
drawbacks. In most of these engines, the suc
tion ports of the scavenging pump are controlled
by automatically operating ?aps which, however,
start to wobble at higher numbers of revolutions
and do not operate satisfactory‘ anymore. Com‘
10 pared with the four stroke engine, the advantages
of simplicity are lost if valves or slides operated
by control members are arranged, because in this
event the construction of the engine becomes
complicated. Finally engines are known, in
15 which the suction ports of, the scavenging pumps
in the construction of aircraft engines.
One mode of carrying out the present inven
tion is illustrated by way of example and partly
in section in the accompanying drawings.
Fig. 1 is a vertical section through the‘ engine,
with the working piston at top dead centre.
Fig. 2 is a diagram of the position of the cranks
of the working piston I and scavenging piston II,
corresponding to Fig. 1.
v
I
Fig. 3 is a section through the engine with the
working-piston at bottom dead centre.
Fig. 4 shows the position of the cranks corre
sponding to Fig. 3.
,
»
In the drawing a is a cylinder of the working 15
set, b its piston, e a cylinder of the scavenging
are opened by the scavenging piston just before
set and 1 its piston. Both pistons operate'on
the latter reaches its dead centre, thus where the
scavenging piston controls the suction ports.
connecting rods 0, g.
20 However in this construction, during the sue
tion stroke of the piston, a vacuum depending
on the extent of the clearance is formed in the
scavenging cylinder with the result of an un
necessary expenditure of power, hot scavenging
25 air and thus small e?lciency of the engine.
The present invention has for its object to ob
viate these drawbacks in the case of engines
provided with two sets of radially arranged cyl
inders, one of said sets comprising solely work
30 ing cylinders and the other set consists of corre
sponding scavenging cylinders only, and the es
sential feature of the present invention consists
in that always one working cylinder and one
scavenging cylinder are co-opcrating in such
35 manner that the piston of the working cylin
der controls the inlet and outlet of air into and
out of the corresponding scavenging cylinder.
Further according to the invention, the pistons
of each set are mounted on separate cranks of a]
40 crank-shalt, which are displaced with respect to
one another in such manner, that the co-operat
ing working- and scavenging cylinders may be
arranged behind one another whereby, however,
the scavenging cylinder is timely controlled by
45 the piston of the working cylinder. This ar
separate cranks d, h of a crank-shaft through
The crank h of the scav
enging cylinder is in advance by approximately
130 degrees. Further, k is the duct leading from
the scavenging cylinder e to the working cylinder
0., m is the scavenging port of the working cyl
inder and n the suction port ofthe latter. Air is
sucked by way of the port 11. from the crank-case
of the working set. '0 is the exhaust port.
Having now particularly described and ascer
tained the nature of my said invention and in
what manner the same is to be performed, I
30
declare that what I claim is1. An engine having a set oi.’ radially arranged
working cylinders and a set of‘ radially arranged
scavenging cylinders each co-operating with one
of the working cylinders, pistons reciprocating in'
the cylinders, and a passage connecting each
scavenging cylinder with the corresponding work
ing cylinder, with one port in the scavenging cyl
inder and twov piston-controlled ports in the
working cylinder, of which one opens into the ‘
combustion space of the cylinder and the other 40
opens into the lower part of the cylinder below
the piston.
2. An engine as claimed in claim 1, having each
scavenging cylinder arranged beside the corre
sponding working cylinder, and having a crank
shaft, with one crank for the pistons of all the
rangement possesses the advantages of renders
ing unnecessary the provision of connecting ?ues
working cylinders and another crank, displaced
or pipes between the two cylinders ‘and further
with respect to the ?rst crank, for the pistons of
the scavenging cylinder is shielded by the work
50 ing cylinder, whereby not only the weight but
also the air-resistance of the engine are reduced;
all the scavenging cylinders.
IGNAZ znrssn;
50.
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