вход по аккаунту


Патент USA US2406258

код для вставки
fÀug. 20, 1946.
- 2,406,258
’ Filedoct, 9, 1944
Patenfed Aug. 2o, 194e
William A. Roth, St. Paul, Minn.
Application October 9, 1944, Serial No. 557,813
5 Claims.
(Cl. 12S-78)
skirt 23; A depending cylindrical sleeve I'I with
a taper cross-section extends internally into the
piston, its center line being in parallel relation to
This is an improvement on and supplement to
my construction as shown in my application for
patent, Serial No. 489,692, ñledpJune 4, 1943.
the wall of the skirt 23, and situated between the
sleeve I2 and the skirt 23 to provide the recesses
I3 between the skirt 23 and the sleeve I'I, and the
sleeve I1 and the sleeve I2.
On the lower end of the skirt 23, I provide a
My invention relates to an improvement 'in pis
tons for internal combustion engines oi the four
cycle type. A primary object of my invention is
to remove, during the exhaust stroke, practically
the entire exhaust gases that are ordinarily
trapped in the clearance space of the present type ' ring I4 which is threaded inside the lower end
10 of the skirt 23 and is adapted to be fixed by the
of internal combustion engines.
pins I5 to the skirt 23 of the piston. The inner
Another object of primary importance is to
end of the sleeve I4 is in the form of a cylindrical
provide a means for increasing the amount of fuel
wall I6 which is parallel to the wall 23 of the skirt
and air mixture drawn into the cylinders during
of the piston. A cylindrical sleeve I8 is formed
the intake stroke, without the use of supercharger
15 with a taper cross-section whose center line'is
means when this is found to be desirable.
parallel to the wall 23 of the skirt of thekpiston
The foregoing objects provide a piston for in
and thereby providing the annular recesses 8
ternal combustion engines to increase eiiiciency,
which are complemental in size and shape to the
power,.and a great saving in fuel during the oper
recesses I3 on the inside of the upper end of the .
ation of the internal combustion engine. The
increased efficiency and power obtained by using 20 head of the piston A.
The cylindrical sleeve I2 and the cylindrical
my piston in internal combustion engines tends
wall I6 have the same axis and extend in the same
to provide an engine of smaller weight for the
cylindrical plane, being spaced apart and adapted
same power than an internal combustion engine
using the ordinary type of piston. `
to provide a bearing for the ends of the wrist-pin
sleeve B.
A further feature resides in providing Aan in
ternal combustion engine’with lower'intake and
The wrist-pin 24 is mounted centrally between
compression temperatures, thereby permitting>
the ends in the sleeve B in any suitable manner
the use of lower octane fuel for the same com
and is adapted to support the upper end of the
pression ratio, or higher compression ratio for the
same octane rating.
connecting rod C.
with an outer diameter of such dimensions as to
make a close fit within the apron 23, and an inner
diameter at each end of the sleeve Bfto make a
My piston is applicable to airplane motors,
wherein I believe it will develop greater efficiency
with a decrease in engine weight for the power
close ñt against the sleeves I2 and I6. 'I'he sleeve
B is formed with outer and inner walls Il which
are spaced apart to form the annular space I9.
These walls I I extend on either side, that is, above
and below, the wrist-pin to form the annular
space I9 above the wrist-pin vand a similar an
developed by the engine using my pistons. These
pistons may be used to advantage in automobile,
Diesel, and other engines of the four cycle type,
where performance as deñned herein is desirable.'
The details and further features of my pistons
will be more fully hereinafter set forth.
In the drawing forming a part of my specifi
Figure 1 is a side elevation of my piston.
Figure 2 illustrates a diagrammatic cross-sec
tion of my piston.
Figure 3 is a section on the line 3-3 of Figure 2.
Figure 4 is a section on the line 4--4 of Figure 2.
Figure 5 is a section on the line 5-5 of Figure 2.
My piston A may be used in any type of four
cycle internal combustion engine, and is provided
with a head portion I0 which may be formed in
tegral with the skirt 23 as illustrated in Figures
1 and 2.
The head III is formed with an internal de
pending cylindrical sleeve I2 which extends into
The sleeve B is constructed in cylindrical form
nular’space 20 below the wrist-pin. The annular
spaces I9 and 20 extend from the points 28 and
29, respectively, to each end of the sleeveB. The
central portion 22 between the points 28 andA 29
maybe of solid construction with holes 2I, of
such size as to permit cil or a ñuid to flow freely
through them.
The inner and outer walls II have a uniform
lthickness, while the ltapered walls I ’I and I8 are
thicker at the base and tapered to a thin edge 9
at the outer end. In operation, when the ends of
the Walls I I come into near contact with the bot
toms of the recesses 8 or I3, the bases of the walls ‘
I'I or I8 will practically close the openings at the
ends of the'sleeve B forming the annular spaces
the piston in parallel relation to the wall of the 55 I9 or 20, thus preventing, or slowing to'a mini
mum, the iiow of oil or fluid from the bottom of
the recesses 8 or I3 into the annular spaces I9,
or 20.
in contact with the faces 3.2 and so metal to metal
contact is made without shock.
This action of the piston A permits it to travel Y
My piston A will reciprocate in a cylinder (not
to the top of the cylinder, thus forcing out prac
shown) in the operation vof the internal combus 5 tically all of the exhaust gases.
tion engine and the movement of the piston A will
As the exhaust stroke is completed, andthe
be beyond the movement of the sleeve B during
suction stroke begins, the piston A will remain in
:the suction and exhaust strokes of a four-cycle
the position, with respect to the sleeve B, that
it had at the end of the exhaust stroke, and will
During. the exhaust stroke the piston A, due to 10 remain in this position up to a'point somewhat
inertia force will move to a greater distance than
less than one«half they length of' the suction
the wrist-pin sleeve B, and during the suction
stroke, when the sleeve B will again begin to slow
stroke, the piston A will again move a greater
down while the piston A -will tend to move vat its
distance than the sleeve B, while during the com;
highestY rate of speed during‘this stroke and be
pression and power strokes the piston A
move ' gin to move with respect to thegsleeve B, towards
as a unit with the wrist-pin sleeve B.
the crank end to its limit of travel and again
To prevent shock at Íthe ends of thef suction
make 'metal to metal contact without shock in '
and exhaust strokes, it is necessary to have the
a manner similar to the exhaust stroke.
recesses 8 and I3, the annular spaces I9 and 2li,During this suction stroke a greater quantity of
and the holes 2l filled with a fluid, such as oil or 20 fresh air and gas can be >drawn into the cylinder
other suitable fluid, and kept under pressure, toV
with full open throttle, andV since the hot clear
insure'that the said spaces will be kept filled at
ance gas is absent, the new charge will have an
all times while the engine is inA operation, to make
lower temperature.
up any leakage, and to renew the fluid contln
Y At the beginning of the compression stroke», the ’
uously to prevent its overheating due to violent 25 faces 25 will be in contact with the> faces 30 at
agitation andy the heat of combustion.
the bottom Vof the recesses I3, and will tend to
This'iiuid may be passed through the connect
remain in this position up to a pointv somewhat
ing rod- and wrist-pin as shown by the passage
more than half the length of the compression
ways 34 and 35, respectively, Y as in other well
stroke when the piston AV again will tend to move,
known manners.
30' due to its inertia, ahead of the sleeve B, but since
Y The operation of my piston may be further set
the total pressure on the head of the piston A, due
forth to more clearly define the operation as fol
to thev compression of the charge is greater than
A1; the end of the power stroke which then be
comes the beginning of the exhaust stroke, the
upper faces 25 of the annular walls II of the
wrist-pin section B- are in contact with the bot
tom 33- of the annularrecesses I3 of the piston A.
_The lower annular walls II of the wrist-pin sec
the inertia force'of the piston A, the. pistonA will'
remain in the positiorn with respect. to. the sleeve
B, that it had at the beginning of they compres
sion stroke.
In this position at the beginning of the'power
stroke, no shock` results at the end of the suc
tion and the beginning of the> power strokes. The
tion B will be withdrawn from the annular spaces 40 piston A will remain in this position during the
power stroke to the beginning of the exhaust
The piston A will stay in this position with re
stroke when the cycle will be repeated as de
spect to the sleeveB until a point, somewhat more
scribed, no shock resulting at the end' ofthe pow--y
than one-half the length of the motion of the
er stroke, and thus; no shockl results throughout
sleeve B isl reached, when the sleeve B will begin 45 the cycle.
to slow down, the piston A, being at its highest
Construction of my piston is simple and» I pro-Y
rate of speed at this point due to its inertia, will
vide a means of permitting- ther piston to travel
tend to continue at this` highest rate of speed
beyond the stroke of the connecting rod with a
and thus proceed towardsthe head of the cylinder
cushioned operation in either direction, as well
50 as a floating supporting means for the piston
at a faster rate than the sleeve> B.
Simultaneously, while this action of the piston
A is taking place, the oil or other ñuid in the an
'I'he circulation of oil may be carried out in’
nular spaces 8 is forced out, passing through the
any manner to introduce a slight pressure in the
opening between the annular walls II and the
cavities between the floating piston and the sleeve
, annular wall of sloping cross-section I8, through 55 for supporting the same, which will lubricate the
the holes 2I of the sleeve B and into the annulary
moving parts, as well as assisting to cool the same
spaces I9 and thence into the spaces I3, as the
in the operation of the piston. A suiiicient oil
walls I I are withdrawn from the spaces I3.
release from these moving- parts maybe carried
Because of the sloping cross-section of the wall
I8, the opening between the wall I8 and the walls 60 on from the seeping of oil which will flow back
to the crank case. It is also obvious that ant7
I I will become smaller as the piston A moves for
suitable means for lubrication by oil to the mov
ward, thus permitting the oil in the spaces 8 to
ing parts may be employed which may be made
ii'ow less freely. A pressure begins to build up,
in accordance with the particular engine in which
acting on the faces 32> of the lower walls II of the
the piston is used, which means is not shown in
piston A tending to slow up the relative speed of
the drawing, but which is well, known inv the
the piston.
art of internal combustion engines. Such` means
As the piston A rproceeds forward with respect
is set forth in “Steam Power and Internal C‘om
to the sleeve B, the opening between the wall I8`
bustion Engines,” by Craig and Anderson, pub-1
and the walls I I becomes smaller and smaller, and
lished in 1937 by McGraw-Hill Book Co., Inc.,V
as the piston A nears the end of its travel with re
and as outlined on pages 513 and 514.
~ Y
spect tothe sleeve B, the opening between the
I have worked out the practical operation; ofv
wall' I8 and the walls II becomes so small that
the flow through the opening is greatly restricted,
my piston by mathematical calculations which Y
and as the piston A reaches the end of'its travel,
indicate the advantages of my piston over the. old'
the'flow is entirely stopped as the faces 26 come 75 type used heretofore.
by` when oil and hydraulic means is introduced
I claim:
into said sleeve and about said tapered skirts,
1. A piston for internal combustion engines,
the operation of said piston and sleeve will be
comprising a cylindrical sleeve carried by the
cushioned to prevent metal to metal shock in
Wrist-pin and the connecting rod, a. piston sur
rounding said sleeve and i‘loatingly supported ER their operation of said piston and said piston
will be permitted to travel >beyond the stroke of
thereon, a depending skirt having a tapered for
the connecting rod in either direction of recipro
mation providing a thin -outer edge and an en
cation thereof.
larged base portion formed integral with the head
4. A piston unit for engines, including a piston
of the piston and adapted to extend into a cy-Í
body having a series of grooves for receiving pis
lindrical annular passageway formed in said
ton rings, a wrist-pin, a piston supporting unit
sleeve, a ring member anchored in the skirt of
slidably mounted within saidy piston body to which`
said piston and having a similarly formed ta
the said wrist-pin is connected, the body of said
pered skirt adapted to extend into the opposite
piston being adapted to travel beyond the re
end of the annular passageway formed in the
ciprocating movement of the piston supporting
sleeve carried by the wrist-pin, whereby a tapered
sleeve within the same, and cylindrical dashpot
skirt extends into either end of said sleeve sup
means extending to the wrist pin formed in each
ported by the wrist-pin which is adapted to act
end of said sleeve, and plunger means on said
as tapered plunger means Within the annular cy
pistonv adapted to extend into said dash-pot
lindrical passageways formed in said sleeve to
gradually cushion the operation of said piston and 20 means in said sleeve, the area of said plunger
means increasing at the base and diminishing at
sleeve when reciprocating in operation, when oil
the outer end to a sharp edge, said dash-pot
is introduced into said annular cylindrical pas
sageway formed in the ends of said sleeve which
floatingly supports said piston.
means with said plunger means forming a hy
draulic cushion when a liquid is introduced into
2. A piston for internal combustion engines, in 25 said dash-pot means of said sleeve, and about
the area of said plunger means to cushion the
cluding a wrist-pin sleeve adapted to'be float
end strokes of said piston in its reciprocating’
ingly reciprocated in said piston by the operation
of a connecting rod attached to said sleeve, an
5. A piston for cylinders, having a body por
annular oil chamber formed in either end of said
sleeve, a pair of tapered plunger walls having a 30 tion, a series of ring grooves formed in said body
portion, long tapered plungers projecting within
sharp annular outer edge carried by said piston
said piston body from either end, a cylindrical
adapted to enter the said oil chamber and grad
'dash-pot sleeve reciprocable Within the piston
ually cushion the operation of the piston by hy
body, a wrist-pin connecting said dash-pot sleeve
draulic means in the reciprocation of the same
with a connecting rod, said tapered plungers being
in its floating support on said sleeve.
adapted to extend into the dash-pot of said sleeve,
3. A piston for internal combustion engines,
whereby when liquid is introduced into said dash
including a piston body having a head and skirt
pot sleeve and around said plungers, the recipro
means, a sleeve internally mounted in said piston
cating movement of said piston will be cushioned
body adapted to floatingly support said piston
at the ends of its stroke, by the retarding action
and having an annular oil‘chamber in each end,
of said dash-pot sleeve and plungers when a
a wrist pin and connecting rod attached to said
is introduced into said dash-pot, and said
sleeve, and a pair of tapered sharp edged skirt
piston is permitted to travel beyond the recipro
walls adapted to extend from said piston into
cating movement of said dash-pot sleeve.
either end of said sleeve to operate in said oil
chamber during the reciprocation thereof, where
Без категории
Размер файла
527 Кб
Пожаловаться на содержимое документа