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Патент USA US2135415

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Nov. 1, 1938.
L, ,_ SEVEN
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2,135,415
MEANS FOR EXPANDING PISTON RINGS
Filed June 28, 1937
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INVENTOR
LOUIS
1. SIEVEN
BY HIS ATTORNEYS
2,135,415
Patented Nov. 1, 1938
UNITED STATES PATENT OFFICE
2,135,415
MEANS
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EXPANDING PISTON RINGS
Louis I. Sieven, Brooklyn, N. Y.
Application June 28, 1937, Serial No. 150,829
8 Claims.
(01.‘ 30942)
This invention relates to internal combustion‘
'
spondin'gly shaped opening in the piston head 6
engines and more particularly to means for ex-. and an angularly shaped portion '20 which ?ts a
panding the piston rings of internal combustion
engines and it is an object of this invention to
5 provide an improved means for expanding the
piston rings of internal combustion engines which
can be installed when the engine is assembled but
held in an inoperative position until needed and
it is a further object of this invention to provide
1O a means of the type described which can be ren
dered when desired without dismantling the en
gine.
In the drawing:
Fig. 1 is a transverse sectional View of a piston
15 Ifor an internal combustion engine equipped with
a means for expanding the piston rings thereof in
accordance with this invention, the means for
expanding the piston rings being shown‘ in inop
erative position;
20'
a
a
Fig. 2 is a view of the structure of Fig. 1 part
ly in elevation and partly in vertical section -on
the line 2—2 of Fig. l, the means for expanding
the piston ring being shown in operative position;
Fig. 3 is a fragmentary view, similar to Fig. 1,
showing the means for expanding the piston rings
in operative position; and
Fig. {l is a fragmentary view similar 'to- Fig. 1
and showing in inoperative position a means of
slightly modi?ed construction.
30'
In internal combustion engines the loss in en
gine e?iciency with increased wear of the piston
rings renders some method of expanding worn
or old piston rings desirable when wear occurs
to a su?icient extent that leakage past the pistons
becomes excessive, but inasmuch as piston rings,
when new or not greatly worn, have suflicient
resiliency to prevent leakage past the piston with
out the necessity of means for expanding the
rings, it is also desirable that the means for ex
panding the piston rings be of such a construc
tion that it can be inserted when the engine is
assembled but held inoperative until the pistons
correspondingly shaped opening in the hubv I.v
The lower ‘end of the bolt is of reduced diameter
and threaded, as at 22 to receive a split washer 23
and nut 24 which serve to secure the center piece
I against the face 4 of the piston head 6 so
tightly that friction prevents rotation of the hub
I‘ with respect to the piston during operation of
the engine.
Secured ‘to the hub I so as to project radially
therefrom are the sets ofvtubes 26, 21 and 28, each
set comprising 'a plurality of tubes uniformly
spaced about the hub-I and positioned in line
with a piston ring groove, the tubes of each set
being staggered with respect to the tubes of each
of the other sets. In each tube is a plunger 36
which tapers to a point at’ its outer end and which
is pressed outwardly by va spring 32 held under
compression between the plunger 30 and the hub 20'
I; ‘Pins 34, ?xed in the plungers 30 and project
ing slightly through slots in the tubes, limit the
outward movement of the plungers. Holes 36
extending through the piston 8 in line with the
piston ring grooves I0 and spaced uniformly 25
about the piston in accordance with the spacing ,
of the tubes 26, 21 and 28 permit the plungers
30 to beprojected through the piston 8 by the
springs '32 ‘when the plungers 30 are alined with
the openings 36 so that the-plungers are forced
into engagement with the piston rings I2, ex
panding the piston rings and holding the piston
rings in effective sealing engagement with the
cylinder wall.
When the engine is assembled the hub I is
placed so that the plungers 30 engage the inside
of the piston a short distance to one side of the
openings 36 and the bolt I‘I holds the hub against
the piston head 6 so that friction between the
inner face 4 of the piston head and the hub I
and between the plungers and the piston holds
the hub against rotation during operation of the
wear su?iciently to make the use of expanding
means desirable and then operated without neces
engine. When the piston rings wear so as to
in accordance with this invention comprises a
cylindrical center piece or hub I having a face
2 thereof shaped to ?t the central portion of the
'50 inner face 4 .of the head 6 of a piston 8 which
is provided with the usual slots III in which are
placed the usual piston rings I2. The head 6
of the piston 8 is recessed, as at M, to receive the
bolt I1 and the bolt I'I turned to rotate the hub
permit excessive leakage along the cylinder wall,
the spark plug is removed, a wrench inserted and 45
sitating
dismantling
of
the
engine.
45
As shown in the drawing, a device constructed‘ engaged in the recesses IIia in the head I6 of the
head I6 of a bolt I'I, having a stem which com
55 prises a cylindrical portion I8 which ?ts a corre
I and tubes 26, 21 vand 28 until the plungers 30
are projected through the openings 36 in the pis
ton 8 to expand the piston rings I2.
50
Where it is desired to seal the openings 36 prior
to inserting the plungers 30 therein so as to pre
vent any‘ leakage past the piston rings and
through the openings 36, the tubes 26, 21 and
28 may be provided with laterally projecting lips 55.
2,135,415
which cover the openings 36 while the hub I, and
tubes 26,.21 and 28 are positioned so that the
plungers 30 do not engage in the openings 36.
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Whatrisrclaimed
is:
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grooves, of a hub, means securing said hub to i‘
the inside of said piston for rotation about they
V longitudinal axis of said piston, said means en-_
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l. The combination'with a hollow piston hav
ing piston ‘ring grooves,’ piston rings in said
gaging said piston and hubuto yieldingly oppose
rotation of said hub, radially projecting tubes "
carried by said hub'a'nd arranged 'for aline'ment“
grooves and openings through said piston to said 7 with the openings in' said" piston, plungers '
' ‘grooves, of a hub. means securing said hub in mounted in said tubes and means forprojecting
' ' said piston for rotation about'the longitudinal , said plungers throughrsaid openings to expand,
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axis of said. piston, reciprocable plungers carried said rings, said. securing means being arranged 10'
by said hub and held withdrawn from vsaid open-1 > for‘operation of said hub to aline said plungers
rings in said piston, springs for forcing ‘said plung
with the openings in said piston.
ers outwardly and means for rotating said hub
and plungers to a position in which said. springs '
15
project said plungersthrough saidopenings to
expand said piston rings.
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2.7 The'conibination with a, hollow piston hav
ing piston ring grooves, piston rings in said
va The combination with a hollow piston, havé "
ing piston ring grooves, piston rings 'in' said 7
‘ ‘grooves and openings through said piston to said 15'
grooves, of a hub, means securing" said hub to '
the‘inside of said piston for rotation about the '
longitudinal axis of said piston, radially project-1
,grooves and openings through said piston to said , ing tubes carriedby said hub and arranged for
20 grooves; of a'hub, means securing said hub-‘in .alinement with the openings in said piston, 20
said; piston for rotation about the longitudinal
axis'of‘ said piston,’ tubes carried by said hub,
plungers mounted ior- reciprocation in said tubes
and springs - in” said 1 tubes for projecting , said
Qplungers through the openings in ~ said "piston to
expand said piston rings.
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plungers, mounted in said tubes and means for l
projecting said plungers through said openings‘
to expand said rings, saidtubes having means
for closing the openings in said piston.
7. The combination with a hollow piston hav;
ing piston ring'grooves, piston rings in ;said '
3. The combination with a hollow piston'hav
grooves and ,openings through said piston to
ing piston ring grooves, piston rings‘in said ‘ saidgrooveaof a hub, means securing said hub
grooves and openings through said piston tofsaid' in, said piston ,for rotation about the longitu- 1 ;
of a hub, means securing said-hub in dinal axis of said piston, ‘plungers carried by'said v30
'30 grooves,
said piston, said means permitting relative rota
hub and held inactive by said piston, means to r
tion'of said huband piston, radially projecting rotate said hub and plungers‘ to position said a‘
,tubesmounted; on said hub, plungers mounted plungers for insertion into theopenings in-said
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in said tubes ‘and means ‘for j projecting :said, piston and ' means to, project said plungers -1
through said‘ openings to expand said vpiston
therewith to expand said piston rings. »,
35 {plungers through said openings when Valined
rings.v
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,4. The combination with a hollow, piston havv-r
8. The combination with a hollow piston hav-'
ing piston ring grooves, piston rings in; said ing‘ piston ring grooves,’ piston rings in said'
grooves and openings through said piston to said _' grooves and openings through said piston to said
40 grooves, of a hub, means securing said hub to the grooves, of a hub, means "pivotally supporting
insiderof saidpiston for rotation about thelongi~
tudinaliaxis of' said piston, radially’ projecting
7 said hub in said piston, tubes projecting radially, , 3
fromopenings
the
said hub,inmeans
said piston,
on saidplungers
tubes formounted
closing, ' '
tubes carried by saidrhub and arranged for aline
ment with the openings in said piston, plungers in said tubes; means ‘for rotating said hub'to
45 'mounted inysaid tubes and means for projecting shift said closing means from, said openings and '
said plungers through said openings to expand to aline said tubes with said openings-and means ' '
said’rings;
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for projecting said plungers through said op_en-_'
~ 5.'The combination. with a hollow piston hav
, ing piston Y‘ ring grooves, pistoncrings in said
50 ' grooves ,andopenings through said piston tosaid
ings to expand said piston rings when said tubes’
aline with said openings.
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LOUISI. SIEVEN;
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