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Nov.
5, 1946.
2,410,428
vQcRoNsTED-r ET A1.
.`
PTSTON CONSTRUCTION FOR COMPRESSOR UNITS
Filed July 25, 1_943
3 Sheets-Sheet 1
54l
I
FIG.
v44
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d
A~ TORNEY
Nov. 5, 194s.
2,410,428
-v_. cRoNsTE’DT v|51- AL
O PIS'TON CONSTRUCTION FOR COMPRESSOR UNITS
Filed July 23, 1943
5 Sheets-Sheet 2
2FIG.
ATTORNY
Nov. 5, 1946.
I I
v.- cRoNsTEDT ETAL I
'
21,410,428
PISTON CONSTRUCTION FOR COMPRESSOR UNITS
Filed July y2s, 194s
i 3 Sheets-*Sheet 5
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Patented Nov. 5, 1946
2,410,428
, UNITES-STATES Premi oIjf-Flîcr.,l
" PISTON CONSTRUCTION FOR
' COMPRESSOR UNITS
Val> Cronste'dt, Marlboro, and Andrew Kalitìnsky,
' Eagleville, Conn., assignors to United Aircraft
Corporation. East Hartford, Conn., a corpora->
tion of Delaware
Application July 23, 1943, serial No. 495,933 'ì f
9 Claims.
(ci. 309-4)
1
2
Large diameter pistons, particularly in high
a linkage, which may include racks 34 extending
from the compressor pistons and engaging a
speed machines such as the compressor pistons of
engine-and-compressor units, are subjected >to
bending stresses resulting from the high accel
eration of the piston at opposite ends of its stroke.
pinion 36.
An object of this invention is to reinforce the
opposite end-s of the compressor cylinders. The
compressed air leaves the cylinders through dis
piston against shear resulting from these bending
stresses.
Intake manifold 38 conducts air to intake valves
46, see Fig. 4, through which air alternately enters
charge valves 42, similar to valves 4i), and also at
opposite ends of the compressor cylinders, and
The compressor piston must be thick enough
to carry sealing rings at it-s periphery and must 10 passesv through scavenge manifold 44 through
ports 46 and 48 which are uncovered by pistons
have substantially flat side walls for minimizing
l2 and i4 at the end of the power stroke, thereby
the clearance volume at the ends of its stroke..
permitting air to be blown through the engine
Such a piston, if solid, is relatively heavy and
cylinder and exhaust ports 50 and 52 into exhaust
requires the rest of the machine to be heavy in
order to operate successfully. A feature of this 15 manifold 54. Valves 40 and 42 may be the type
shown, for example, in Huil Patent Number
invention is a piston which is made hollow to
1,599,414, dated September 14, 1926.
reduce weight and which is still strong enough
Each compressor piston I6 and i8 is made up
to withstand the shear resulting from the bending
of opposed discs 56 and 58, the former being in
stresses on the piston.
The rate of reciprocation of the pistons in a 20 tegral with a hub 66 on which the engine piston
free-piston engine-and-compressor unit is de
44 and air spring or sleeve 26 may be mounted.
pendent upon the weights of the moving part-s.
Disc 56, forming the inner surface of the com
pressor piston is clamped against disc 56 by the
Lightening the piston to increase its rate of re
engine piston and is also held in place by bolts
ciprocation may reduce the strength of the piston,
particularly the large diameter compressor piston 25 62 extending through opposed bosses 64 and 66
on discs 56 and 58 which hold the discs in spaced
so that it is no longer strong enough to withstand
relation. Both discs have opposed radially ex
the forces acting on it. A feature of this inven
tending ribs 68 and lll engaging each other. The
tion is'a reinforced piston which is light in weight.
Other objects and advantages will be apparent
contacting surfaces of bosses 64 and 66 and ribs
from the speciñcation and claims and from the 30 66 and ‘lll are provided with serrations 'l2 to pre
accompanying drawings which illustrate an em
vent any relative movement between the discs.
These serrations or grooves are at right angles
bodiment of the invention.
Fig. 1 is a longitudinal sectional View through
to the radius of the disc as shown and thus resist
a free-piston unit showing the pistons therein.
shear stresses in the discs.
Either or both discs may also have circumfer
» Fig. 2 is a sectional view through one of the 35
entially extending ribs 14 and other radially eX
piston assemblies, showing o-ne side disc of the
tending ribs ‘F6 which are not thick enough to
compressor piston in elevation.
Fig. 3 i-s an enlarged longitudinal section of a
engage with the opposite disc but which act as
part of the piston.
reinforcement for the disc on which they are
Fig. 4 is a sectional View through the intake 40 formed. The ribs may extend between adjacent
valve.
‘bosses 64 on disc 56 or bosses 66 on di-sc 58. These
The unit shown includes an engine cylinder l0
bosses act as spacers for the opposed discs 56 and
having reciprocating pistons I2 and I4 to which
58 and prevent buckling of the discs when bolts
compressor pistons I6 and I8 in cylinders 2D and
62 are tightened.
'
22 are integrally connected. Sleeves 24 and 26 45
It
is
to
be
under-stood
that
the
invention
is not
attached to the compressor pistons complete the
limited to the speciñc _embodiment herein illus
reciprocating piston assemblies; The sleeves in
trated and described, but may be used in other
combination with stationary pistons 28 and 30
ways without departure from its spirit as deñned
form air spring cylinders.
The piston assemblies are moved apart by the 50 by the following claims.
We claim:
_
burning of fuel injected into engine cylinder l0.
1. A piston including opposed discs having ribs
Air compressed in the air spring cylinders on the
on the adjacent surfaces engaging each other and
power stroke returns the piston assemblies.. The
serrations on the adjoining rib surfaces.
v
assemblies are always maintained at equal dis
tances from the center of the engine cylinder by 55 2. A piston including opposed discs having ribs
2,410,428
3
4
on the adjacent surfaces engaging each other and
serratíons on at least a part of some of the ribs.
3. A piston including opposed discs, and a num
ber of interengaging serrate rib-s on the adjacent
surfaces of the discs.
4. A piston including opposed discs, and a num
ber of _radia-l‘linterengaging serrate ribs on the
cent surfaces, said ribs having interengaging
adjacent surfaces of the discs.
'
'
5. A piston including opposed discs having a
.
number of interengaging serrate bos-ses on the l0
adjacent surfaces and fastening meansfengaging
teeth and grooves to prevent relative movement
between the ribs.
'
8. A piston including opposed discs having sim
ilarly arranged radial ribs on the adjacent sur
faces, said ribs having interengaging teeth and
grooves extending transversely of the ribs to pre
vent relative movement radially between the
discs.
`
9. A piston including opposed discs having sim
ilarly arranged radial ribs on the adjacent sur
faces, said ribs having interengaging teeth and
grooves extending transversely of th'e ribs to pre
vent relative movement radially between the
adjacent surfaces, and bolts >extending through 15 discs, and means for fastening the discs together
said ëbosses to hold the discs together.
with the teeth and grooves in engagement.
'7. A piston including opposed discs having a
VAL CRONSTEDT.
number of similarly arranged ribs on Vthe adja
ANDREW KALITINSKY.
said bosses to hold the discs together.
6. A piston including opposed discs having a
>number of interengaging serrate bosses on the
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