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Патент USA US3051510

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Aug. 28, 1962
3,051,499
TAKASHI MINEGISHI
SPRING RING
4 Sheets-Sheet 1
Filed Dec. 16, 1959
FIG. ID
.
IN VEN TOR.
WWII/w l‘fl/vfé/flf/
Aug. 28, 1962
TAKASHI MINEGISHI
SPRING RING
Filed Dec. 16, 1959
3,051,499
'
4 Sheets-Sheet 2
Aug. 28, 1962
TAKASHI MINEGISHI
3,051,499
SPRING RING
Filed Dec. 16, 1959
4 Sheets-Sheet 5
Aug- 28, 1962.
TAKASHI MINEGISHI
3,051,499
SPRING RING
4 Sheets-Sheet 4
Filed Dec. 16, 1959
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3,051,499
United States
Fatented Aug. 28, 1962
1
2
3,051,499
Explaining the outline of this invention, the present
invention relates to a spring ring characterized by that
SPRING RING
Takashi Minegishi, Kawagoe City, Japan, assignor to
Nippon Piston Ring Kabushiki Kaisha, Tokyo, Japan
Filed Dec. 16, 1959, Ser. No. 859,948
Claims priority, application Japan Jan. 14, 1959
4 Claims. (Cl. 277—140)
The present invention relates to a spring piston ring
it comprises an open ring made from a band steel or
the like steel strip, having a suitable thickness, bent in
a channel form, and having a gap between the opposite
ends thereof, said ring being provided with a number of
‘alternately arranged slits which extend inwardly from
upper and lower ?anges to an inner web of said channel
ring and which latter is provided with a number of vertical
comprising an open ring made from a band steel or the 10 small projections which project outwardly from the sur
like steel strip, having suitable dimensions, bent in a
channel form, and having a gap between the opposite
ends thereof, said ring being provided with a number
of slits arranged at equal intervals which extend from
the outer rim of the upper ?ange and the lower ?ange,
alternately, to the inner web between said two ?anges, the
latter being provided with vertical small projections which
project outwardly at equal intervals along the inner edge
line of said ?anges (i.e. the edge-lines of said inner web)
so as to be in contact with the inner peripheral surface
of side rails overlapping the upper and lower ?anges re
spectively.
With recent developments in internal combustion en
gines, the running speeds have been greatly increased.
Thereby, material used for piston rings must have a
higher tensile strength, and it is di?icult to satisfy the
tensile ‘strength requirement by conventional cast iron
rings, particularly with respect to the strength and high
e?iciency. Because, the conventional ring is made from
cast-iron in spite of requiring high stress thereon, there
is a certain limit of tensile stress of the material itself.
Therefore, in the case of recent high speed engines, the
piston rings cannot stand the high compression to which
they are subjected and they do not maintain true contact
with a cylinder wall. When the tensile strength of the
ring, particularly in the case of the oil ring, is insufficient
to scrape the oil, it is the cause of troubles of the in
ternal combustion engine and the oil comes up into the
combustion chamber and burns therein. Therefore, in
order to avoid the aforesaid fault a cast-iron oil ring
assembly having combined plate-spring type expanders
faces of said ?anges along an edge of an inner periphery
thereof to engage inner peripheral surfaces of side rails
assembled thereon. The object of the present invention
is to provide a cheap and mass produced spring ring
which has high tensile stress in the spring body itself,
said tensile stress being uniform all over the circumfer
ence thereof, and moreover, an outer periphery of said
spring ring being in uniformly forced contact with an
inside wall of a cylinder.
In the drawings:
FIGS. 1A through ID are plan views of four embodi~
ments of the invention, illustrated before bending of a
metal strip into the shape of a channel piston ring;
FIGS. 2A through 2D are enlarged partial views of
piston rings formed from the strips shown in FIGS. 1A
through 1D, respectively;
FIGS. 3A through 3D are partial views of piston rings
formed from strips shown in FIGS. 1A through 1D, re
spectively;
FIG. 4 is a plan view, partly broken away, of an as_
sembly including the spring ring of the invention and
associated parts; and
FIG. 5 is an enlarged radial sectional view of a piston
ring assembly embodying the invention.
Now referring to the accompanying drawings, there
are many embodiments according to the present invention
and more ring manufacturing methods. However, in
the accompanying drawings, four kinds of embodiments
A, B, C and D are exempli?ed. Now, the spring rings
A, B, C and D shown in FIGS. 1A through ID are made
from the corresponding prefabricated steel plates or strips
A, B, C and D illustrated in FIGS. 2A through 2D re
or a spacer joining together with a side rail made from
spectively, wherein said prefabricated plates are deformed
steel plate and with a plate-spring type expander therein
to the form of the corresponding steel channels A, B,
is usually used, so as to promote the tensile strength of
the oil ring. However, these expanders are normally 45 C and D having arranged slits which are seen in FIGS.
3A through 3D respectively, said steel channels being
made from steel plate in the shape of hexagon or octagon,
bent in the form of the open ring having a gap between
so that the ring is strengthened by the expander in such a
the opposite ends thereof. Utilizing the spring ring A as
way that each of the outside vertexes of the expander
representative of all of the springs, in order to make the
presses only the part of the vertexes which are in con
tact with the inside ring or the side rail, and each of 50 channel ring from the material by means of the fabrica—
tion in accordance with the object of the invention, the
the middle portion of the two adjoining vertexes is in
band steel in which has a suitable thickness, depending
partial contact with the bottom surface of the piston
on the kind and size of the desirable piston ring or steel
slot. In other words, only the several parts of the ex
strip m, is precut to a suitable dimension, and used as
pander are in partial contact with the bottom surface of
the piston slot and the inside of the ring respectively, 55 the material for the rings. The steel plate In is provided
with a number of equally spaced equally dimensioned
so that the pressure which is subjected to the expander
slits 2 formed by means of punching or the like. The
is not uniform but partial all over its periphery. There
slits 2 extending inwardly from opposite edge-lines 1
fore in consequence, elasticity of the ring varies from a
to the inside of said steel plate In as shown in A of FIG. 2.
oil ring is forced to be in contact with the inside wall 60 A number of small projections 4 are formed at the inner
end of and parallel to the slits 2 by punching along the
of the cylinder with uniform pressure. Viewed from the
dotted bending lines 3 of the plate m. The projections 4
aforesaid important point, the conventional method of
project outwardly in vertical direction when the steel plate
combining an expander with a piston ring has the essen
portion to portion, while it is urgently required that the
tial defect which can not be free from the constitution
m is bent in the form of the channel as indicated in FIG.
of the expander itself. And, furthermore it is allowable 65 3A. According to the above described process, the prefab
ricated steel plate shown in FIG. 2A is manufactured.
that the diameter of the ring slot and of the side rail
The size and the relative position of the slits 2 and the
is approximately 0.2. mm. respectively, so that the differ
small projections 4 may be chosen freely, wherein, in
ence of the tensile stress in the ring tends to be more
the case of the spring ring A, each slit 2 extends in
increased when the errors depending on these allowances
The present invention is directed to a
wardly from one side edge to the inside across the op
novel piston ring which will be clear of the disadvantages
stated above.
posite side bending line 3, and each projection 4 is posi
are combined.
tioned in each slit.
A series of upper and the lower
3,051,499
3
4
?anges 5 and 6 of the channel are made by bending both
arranged on the channel ring at the same distance from
sides of the' prefabricated plate at approximately right
each other. The compressing force, by which the side
angles in the same direction along the bending lines 3.
rails are pressed to the inner surface of the cylinder, be
ing transmitted from the inner surfaces of the projections
Then, on the upper and the lower ?anges 5 and 6 of the
channel, a number of the slits 2, which are all of equal
to the side rails, is higher and more uniform than com
form are arranged alternately and symmetrically at equal
pression subjected thereto by means of the conventional
distance from each other, and extend to the opposite
boundary of the web 7 of the channel, wherein the part
manner. Hence, the present spring ring provides not only
an excellent piston ring having an important and essen
tial condition thereof, but also an effective oil ring by
of the slits which extend to the web, forms oil holes 2’
(FIG. 3A) arranged at equal distances from each other,
10 which the oil does not come up to the combustion cham
ber, even if used in the modern high speed internal com
bustion engine, while in the case of the conventional
cast-iron oil ring the oil often comes up. Also the pres
of small projections arranged on the surface thereof along
ent spring ring has a great effect of being in uniform
the bending lines 3 from each other.
The channel steel indicated in FIG. 3A, is fabricated 15 contact. In contrast with the conventional plate-spring
each of which has the same size.’ On the other hand
the said channel steel is also provided with a number
by bending the said small projections of the said pre
fabricated channel at approximately right angles out
wardly. By cutting this fabricated ‘channel steel in a
desirable length, and by bending it in the form of an
open ring with a gap, thus the spring ring shown in FIG.
1A, according to the present invention is manufactured.
After these processes of manufacturing, the above-stated
ring is suitably heat-treated and adjusted properly as well
as known conventional practices, the spring ring of the
present invention being obtained. The usage of the spring 25
ring is following: the spring ring is set into the piston
slot G as shown in enlarged view of FIG. 5, the spring
ring being inserted between two sheets of side rails S,
inner periphery surfaces of which are in contact with
the outer surfaces of the small projections arranged in
circle along the edge-line of said spring ring to arrest the
said side rails as shown in FIG. 4.
The channel steel shown in FIG. 3B is fabricated by
bending the prefabricated plate B according to the object
of the invention, as well as in the case of manufacturing 35
spring ring A. In the above case said prefabricated plate
B is provided with a number of slits 2 and small projec
tions 4 arranged in such a way that their position and
size are shown in FIG. 2B, wherein projections 4 are
positioned connecting to side of the deepest end of slits 40
2. Thus the present spring ring B indicated in FIG. 1C
can be obtained by bending said channel steel in the form
of an open ring with a gap.
If the prefabricated plate is provided with the small
type expander it is unnecessary for the present spring
ring that the spring body is in contact with the bottom
surface of the piston slot, so that the surface of the
cylinder and the piston are not so much abraded by
the remaining gap between the slot bottom and the ring to
allow the ring to move even if the extraordinary pressure
is subjected to the side rail on account of the vibration
of the piston during operation. According to the above
good point, the ?nishing accuracy of the piston slot may
be chosen somewhat lower than standard.
The spring
ring according to the present invention is manufactured
from the steel strip by punching off the slits and bending
it in the desirable shape of the channel, as the result the
bottom parts of said slit become naturally the oil hole
thereof, so that manufacturing thereof is very simple,
quick and mass-productive. Therefore, the present in
vention provides a wonderful economical effect of supply
ing the excellent oil ring cheaply and mass-productively.
I claim:
1. A piston ring assembly comprising in combination
upper and lower rails spaced apart at an interval in an
axial direction, and a spacer expander keeping said rails
at said interval, said spacer expander being of channel
shape and comprising circumferentially spaced upper and
lower ?anges for receiving each rail and straight webs
connected between said ?anges de?ned by slits cut therein
throughout their length from each edge of said ?anges
alternately and symmetrically, with a small axial projec
tion de?ned at the end of each of said slits on the inner
projections 4 arranged in the slits 2 and positioned near
the ‘mouth of said slits as shown in C of FIG. 2C, the
present spring ring C seen in FIG. 1C can be manufac
tured by bending the channel steel in the form of an
open ring with a gap according to the gist of the present
invention, said channel steel shown in C of FIG. 3C
periphery of said ?anges, said projections extending out
being fabricated by means of deforming the said prefabri
cated plate C.
“In the case that the prefabricated plate is provided with
the projections 4, being arranged at the middle portion
upper and lower rail spaced apart ‘at an interval in an
between the adjoining slits 2 as represented in FIG. 2D, ,
the present spring ring D shown in FIG. 1D‘ is made
from said prefabricated plates by means of deforming in
the shape of an open ring with a gap, after bending to
wardly adjacent said rails, each of said rails being pressed
by said projections outwardly in a radial direction, re
spective projections bearing against the rail nearest the
end of the slit which de?nes said projections.
2. A piston ring assembly comprising in combination
axial direction, and a spacer expander keeping said rails
at said interval, said spacer expander being of channel
shape and comprising upper and lower ?anges for re
ceiving each rail and straight webs connected between
said ?anges de?ned by slits cut therein throughout their
length from each edge of said ?anges alternately and sym
metrically, said slits being made of equal width by nar
rowing each of said slits towards the edge of cut from
make the channel steel having arranged slits shown in
FIG. 3D.
60 the web, a small axial projection at the end of each of
said slits on an inner periphery of said ?anges, said pro
Of each ring above mentioned, the outside diameter of
the small projections 4 arranged in circle is slightly larger
jection extending axially outwardly adjacent said rails,
than the inside diameter of the side rail S, so as to
and each of said rails on said ?anges being pressed by
press the small projections on the spring ring to the side
rail S and to force the spring ring to exhibit the elasticity,
the side rail S being made a little thicker than that of the
projections 4. The said spring ring and side rails are
a row of said projections outwardly in radial direction,
respective projections bearing against the rail nearest the
end of the slit which de?nes said projections.
3. A piston ring comprising a continuous strip includ
ment according to this invention, i.e. the spring ring, is
characterized in that not only it possesses high elasticity
and best expansive ef?ciency but also it is subjected to
the uniform elasticity all over the periphery of the ring,
ing upper and lower ?ange portions in axially spaced
relation, webs joining the ends of each of said upper
?ange portions with the next adjacent ends of said lower
?ange portions, projections formed as extensions of said
upper and lower ?ange portions at locations intermediate
the length thereof and extending axially outwardly in
directions away from said connecting webs, said ?ange
became a number of identical slits are symmetrically 75
portions having side edges diverging outwardly from said
combined so as not to be overlapped on the gap of each
part.
As explained in the foregoing description, the embodi
3,051,499
6
5
inner periphery of said ?anges, said projections extending
axially outwardly adjacent said rails, each of said rails
being pressed by said projections outwardly in a radial
direction, said upper and lower ?anges having side edges
connecting webs, circumferentially adjacent ?ange por
tions and webs being separated by radial slots extending
alternately in opposite radial directions of said ring and
each having a closed end in a ?ange portion, the pro
jections of each ?ange portion being adjacent the respec
5 which diverge outwardly from said web- structure.
tive closed end of a slot.
4. A piston ring assembly comprising in combination
upper and lower rails spaced apart at an interval in an
axial direction, and a spacer expander keeping said rails
at said interval, said spacer expander being of channel
shape and comprising circumferentially spaced upper and
lower ?anges for ‘receiving each rail and straight webs
connected between said ?anges de?ned by 1slits out there
in throughout their length from each edge of said ?anges
alternately and symmetrically, each slit having a closed 15
end in a respective ?ange, with a small axial projection
de?ned at the closed end of each of said slits on the
References Cited in the tile of this patent
UNITED STATES PATENTS
2,421,175
2,768,039
2,777,740
2,833,604
2,833,605
2,837,385
2,837,386
Zahodiakin ___________ __ May 27,
Cable _______________ __ Oct. 23,
Pien _________________ __ Jan. 15,
Hunt _________________ __ May 6,
Shirk _________________ .. May 6,
May?eld ______________ _.. June 3,
May?eld _____________ __ June 3,
1947
1956
1957
1958
1958
1958
1953
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