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NOVEL TWO-STROKE ENGINE.
Oscillating Cylinder.
An interesting design for a two-stroke
engine has recently been iiitrouucnt d.v
a Swiss engineer. J.n this design -the cy
linder is made 'to os«ilkte -or rook from
sade to side. Jt is stated that there
are many ways in which the working
parts may be arranged, aud the layouc de
picted in the accompanying diagram is
only one of the possibilities. Jn this
engine the upper part of the cylinder is
ocated in a circular member, witch in
turn is housed in what amounts r.o the
top part of a very deep crank-ease, so
?Jhat -the cylinder can oscillate from side
to aide. The piston is secured directly hi
a connecting rod, which passes through
a packing giand fonrned in- a cover, which
closes the lower end of the cylinder. The
big-end of the connecting rod fits on th«
crankpin in the orthodox manner. As the
crankshaft revokes the cylinder is caus
ed to rock by itlve movement of ths
rigid connecting rod. There is.nothing new
in this idea so far as the roclsiug nio've
nient is concerned, but- the inventor Iuh
gone f-uniherand used the motion to con
trol, the ports in an ingenious method.
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Sectional elevation showing: the arrange
ment of ih*. oscillating cylinder, cr&nk-cafce,
and ports.
Sectional elevation showing: the arrange
ment of ih*. oscillating cylinder, cr&nk-cafce,
and ports.
In . the position of the engine which
is shown in the above, drawing, the ex
plosion has just occurred, and the piston
is »n the point of descending. As it
travels downwards the cylinder swings
over ito the right and then back, tp a
central position. Near to the end of the
stroke , the piston .uncovers an exhaust
port and shortly afterwards the transfer
port -is likewise uncovered. ftfixUirc
which has been compressed in the'lower
half of the cylinder by th-e descending
piston is then transferred to the com
bustion space, -while the burnt gases us
cape' through the port in the left. 'When
the piiton rises on the compression
stroke it first covers the transfer and
exhaust ports, and then causes the cy
linder' bo swing to the left; so 'opening
another port 'ithrough-' which ' 'mixture is'
drawn-fram the' carburetter- to the lower
.half of the cylinder, which thus become*
? filled with a fresh charge. Ait lh« same
'time the mixture in the combustion
Chamber above the piston is. fired in the
t'SUfil manner, the two stroke -cycle being
then repeated.
The motion of the- oscillating cylinder
is *aid 'to. be Very suitable for the- effici
ent working of the port, as . it gives
rapid opening ar.d closing, with a couistd
(?rable intervening dwell. (iood volu
metric efficiency should be obtained an,l
if desired -a number, of cylinders- could
be placed eid'e by side. The'sparkrng
liiiig L- .shown- scrtTved Jnto -the .station
nry portion' of the- crankcase, Ind. com
municates through a port in ithe cylinder
head, spring packing pieces being placed
at each side to pt-event the escape of
gases at this point. In another design
?which is being worked out the cyliiwler is
mounted on two trunnion bearings, but
fpparenttly from reports tliis latter lay
out doe» not appear to be Coo suitable to
motor i»r& '
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