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Патент USA US2007575

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Patented July 9, 1-935
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Alfred Lesage, Schweinfurt, Germany
Application October 5, 1934, Serial No. 746,946
In Germany October 2, 1933
. 4 Claims; iGl. 123-65)
The invention relates .to a two-stroke cycle
engine adapted for distribution by means of
ports [and in which the admission openings are
entirely or almost’ diametrically‘ opposed to the
exhaust opening.
The objectv of the invention is to provide a
thorough scavenging of the cylinder of the en
gine, by means of fresh gases sweeping the in
by means of inclinedparallel- ports the fresh
gases pass through the admission channel 4 into
the cylinder in two parallel jets directed upwards
in a slanting direction, which. jets arestill more
de?ected upwards by the cylinder wall met by
them above the discharge aperture where'they
are combined and inverted as to their direction
in the top portion of the cylinder so that they are
the same' time urged towards the centre of the
terior of the cylinder in its entire area, thus ob at
cylinder on spiral paths and together directed
downwards ‘to the exhaust port in a descending
burnt gases.
direction, thereby expelling the exhaust gases
,This object is attained according to the inven
the discharge aperture -8.
’tion by admitting the'scavenging gaseous'mix through
This guide of the scavenging operation is fur
ture delivered" out of the crank case in two paral ther assisted by a protrusion 9 of the piston head
15 lel streams obliquely directed towards the cylin
directed into the combustion chamber, such as
der head through a conduit which is divided to a vaulted or ‘roof-like head of the piston.‘
form two portsreduced in cross ' section near the
The scavenging operation produced by the fresh
entrance in order to accelerate the velocity of . gases in the cylinder while the direction of the
the gases but enlarged thereafter, the streams ‘?ow is ‘inverted takes place with acceleration in
nozzle-like admission ports whereas the dimen
of the exhaust port are such that the ex
charge port which is comparatively large vertii sions
haust gases urged downwards are allowed to
cally to the axis'of the cylinder. In connection escape above the piston head almost over the
with the said disposition of the ports, the curved full width of the cylinder. The inversion of the 25
25 piston head will give the entering gas streams a ?ow in the cylinderis obtained partly
special direction and inversion favorable for ex admission ports being inclined upwards and partly
pellti‘ng the exhaust gases through the, discharge by the piston head being raised in'its central por-
20 thus being spread in some degree. A further
' characteristic consists in the provision of the dis
An'embodiment of the invention is diagram
illustrated by way of example in the
so. accompanying
drawing, in which
Fig. 1 is a longitudinal-sectional view of the
cylinder and pertinent‘parts of an engine pro
vided with the scavenging system according to
tion so that also on the other side thereof the
gases ?owing off are directed towards the ex
.haust port. In addition to this the nozzles are
enlarged again behind their point of smallest
width so that the streams of gas entering tangen
tially and with increased velocity scavenge the
interior of the whole cylinder and are not only 35
35 the invention, and
urged upwards at the wall opposite to the ad
Fig. 2 represents a cross sectional view on' the mission port but also pressed towards one another.
line II—II of Fig. 1.
In-this,,way thereis obtained a thorough scaveng
The admission channel Lfor the fresh gases, ing of the whole cylinder.
' which communicates with the crank case andsis
I claim:
-40 divided at ' ori?ce by a partition 6 into two in-/
1. In a two-stroke cycle engine, the combina
let-ports ‘I which are uncovered towards the. tion with a cylinder, of a piston reciprocating
cylinder above the head of the‘pistoh 5 when the therein, parallel admissionapertures inclined to-.
latter is in its lowermost position. The said wards the cylinder head,>the said apertures being
ports are contracted like nozzles at a distance reduced in cross-section and again gradually in 45
45 from the cylinder wall and then gradually en creased, a discharge aperture located opposite the
larged again in such a way that the'scavenging admission apertures, and a dome-shaped piston
gases enter the cylinder substantially parallel to
each other but‘ permit spreading of the gases‘ on
one side tangentially to the cylinder wall. ~The ex- '
2. In a two-stroke combustion motor, the com
haust port is fully or nearly diametrically op bination with a duct leading the combustible mix
posed to the inlet nozzles and its lateral width is ture of fresh gases to the cylinder, of_ a forking
connection forming the admission ports of the
comparatively large and almost cor esponds to motor,
said ports being parallel and restricted
the distance of the outer‘ walls of e two ad in width
and again gradually increased to ac
mission nozzles;
On account or this design a the distribution commodate themselves to the wall of the cylinder,
_ 2,007,575
the lonzitudln?
phne, an‘ exhaust
tov uncover and ports at
the lower end of its stroke, and having a head
with mrl'acea extending from said port: 'upwu-dly '
town-dz the'head end 01' said cylinder, whereby
ex?aust port,tl_1e nxea 0t theyhellcgs being sub
stantially at right males to the ‘axis of the 10
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