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Патент USA US2112871

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April 5, 1938.
2,112,871
W. WILSON
ExPANsIBLE BIsToN
4Original Filed Aug. 20.- 1934
...SÉ
Patented Apr. 5, i938
2,112,871
omer.
2,112,871
\ EXPANSIBLE PKSTON
Wesley Wilson, Chicago, Ill.v
Application August 20, 1934, serial No. 740,574
Renewed June 5, 1937
7 Claims. (Cl. 309-12)
My invention relatesj to a piston construction for a slight rocking movement in suitable bear
and more specifically to expansible pistons for use ing bosses 5 on the piston l.
in internal combustion engines.
I take advantage of the wear occasioned by
It has been found that pistons of internal com
the slight rocking movement of the wrist pin td
bustion engines wear in such a Way as to develop
control the expanding action of the spring
“piston slap” due to the side pressure to» which pressed wedge 6 which engages the inclined sur
the pistons are subjected. Various devices have faces 'l adjacent the split- 8 in the' piston and
which tends to expand the piston. This wedge
been proposed with a view to remedying or less
ening the bad eíîects of this wear, including 6 may be in the form of a yoke having openings
in its side portions 9 through which the rock
O spring expanders and screw expanders. The
able wrist pin extends. Suitable helical com
spring devices, however, are open to the objec
tion that they cause considerable pressure to be pression springs IIJ are provided surrounding the
pins H formed on the sides of the yoke for ex
exerted by the piston on the cylinder walls, re
sulting in excessive wear. kThe screw devices are
15 open to the objection that there is no automatic
take-up, so that it is necessary to adjust them
from time to time to take up the wear.
One of the objects of my invention is to pro
vide means for exerting pressure to expand the
2
piston, controlled in its pressure-exerting action
by wear due to the movement of the piston. This
prevents the spring pressure from excessively ex
panding the piston, thus avoiding the objection to
the present spring expanders, and it provides an
automatic wear-controlled take-up, thus avoid
erting pressure to expand the piston. These
springs can force the wedge no further than the
wrist pin will permit, as the edges of the open
ings in the yoke engage the wrist pin, thus re
straining its wedging action. However, the
spring pressure on the yoke will cause a wearing
action on the edges of the openings in the yoke
N) 0
so that as the wrist pin rocks, the edges of the
openings in the yoke will wear and permit the
wedge to move very gradually in a direction to
expand the piston. The Wearing action may be
controlled, either by cutting away a portion of
2 Ul ing the objections to the present screw take-up. ‘ the edge of the opening on the side toward the 5
This device may be installed in a new motor 'and spring, as shown at l2 in Fig. 2, or by providing
provides an automatic take-up for the expansible the edge of the opening on the side toward the
piston during the life of the motor. With the spring with material having the desired wearing
present types of piston expander-s it is necessary qualities, which will cause just the proper gradual 03 0
O to dismantle the motor to install or adjust them.
movement of the wedge, as shown at I3 in Fig. 3.
In the drawing, in which several forins of my
With this construction, it will be seen that the
invention are shown,-f-~
Figure 1 is a bottom plan view of a piston and
35
cylinder but that the gradual wearing action dueA
associated parts embodying my invention;
' Fig.v 2 is a sectional view substantially on the
line _2--2 of Fig. 1;
Fig. 3 is a detail view showing the wrist pin
and associated parts;
K
s _
’
40 ‘ Fig. 4 is a bottom plan view‘showing another
l form of piston and associated parts;
Fig. 5 is ‘a bottom view of another form of pis
ton and associated parts embodying my inven
tion;
to the rocking of the wrist pin will allow a very
gradual movement of the wedge which will takev
up the wear on the piston at a rate proportional
to the extent of use of the piston. It will also
be seen that there is a compensating action be 40
tween the wear of the piston itself and the Wear
on the edge of the opening in the Wedge due to
the wrist pin action, since if the piston wears
comparatively rapidly-say, due to poor lubrica
'
Fig. 6 is a bottom View of another form of pis
ton and associated parts; and
full pressure of the spring is prevented from be
ing exerted as a force tending to expand the
„
Fig. 7 is a bottom view of another form of p’s
ton and associated parts.
Referring to the drawing in detail, and first to
Figs. 1, 2, and 3, the construction shown therein
tion-_the poor lubrication will at the same time
produce increased wear on the expander bearing,
thus permitting a comparatively greater rate of
expansion than would result with normal lubrica
tion.
'
.
The construction of Fig. 4 is quite similar
comprises an expansible piston I, which may be
to that just described, except that the expanding
of aluminum or other suitable material. a con
action of the piston is effected by a resilient
curved plate Ill engaging opposite sides of the
split 8 in the piston and that the springs Ii
which act on> the yoke are backed up by an
necting rod 2, and a hollow wrist pin 3 to which
the upper end of the connecting rod is clamped
55 by means of a screw ii. The wrist pin is mounted
2
2,11_2,'s71
`
'
the
force
of
said
force-exerting
means
from
being
other yoke I5 mounted on'lthe bearing bosses
exerted to such a distance as to press the piston
5 of the piston.
The construction of Fig. 5 is similar to those against the cylinder wall but enabling a slow
, previously described except that here the springs , restrained movement of said force-exerting means
I I which exert pressure on the yoke I6l are backed as the wear progresses.
3. A piston construction comprising an ex
up by the bearing bosses on the piston itself and
the further -distinction that the bearing bosses' pansible cylindrical piston for operating in a cyl
inder, a wrist pin rockably mounted with respect
are split, as indicated at I1, thus providing a con
to said piston, spring means exerting force to
struction in which the smaller of the split por
10 tions Il may yield under the wearing action of expand said piston, and wearable means con- _
the rocking movement of the wrist pin and the trolled in its action by wear accompanying the
rocking movement of said wrist pin preventing
spring pressure-exerted on the yoke. This con
struction will also act to take up for wear in ' the force of said force-exerting means from being
the wrist pin bearing itself.
15
exerted to such a distance as to press the piston
In Fig. 6 is shown a construction in which the
two expanding members I9 are substituted for the
expanding yoke of the previous constructions.
In this i'orm two spring-pressed pressure-exert
members are provided, each i pivotally
20 ing
mounted on theV piston as indicated at 20, adja
cent a split in the piston, each having‘a por
tion through which the wrist pin extends, and
each provided with a spring II for exerting an
expanding action on the pressure-exerting mem-l
ber. Each of these pressure-exerting members is
provided with an extension 2I for engagement
with a lug 22 on the edge of the split in the pis
ton.> 'I'his lug acts as a guide for preventing
30
against the cylinder wall but enabling a slow re
15
piston is split at diametrically opposed points and. strained movement of said force-exerting means
as the wear progresses, said force-exerting and
wearable means comprising a force-transmitting
member having an opening through which said
wrist pin extends, said spring means exerting force v20
on said force-transmitting member to cause wear'
on the edges of said opening due to the rockingl
movement of the wrist pin.
4. A piston construction comprising an ex- '
pansible cylindrical piston for operating in a
The construction of Fig. 7 is similar to that
of Figure 1 except that in this i'orm the wear takes
cylinder, a wrist pin rockably mounted with re
spect to said piston, a connecting rod secured to
said wrist pin, -spring means exerting force to
expand said piston, and wearable means con
trolled in its action by wear accompanying the
rocking movement of said wrist pin preventing the
force of said force-exerting meansfrom being
place on a. bushing 23 of suitable material se
exerted to such a distance as to press the piston
radial movement.
`
'
cured to the wrist pin to rock therewith. In this
form, the wear on the bushing permits the slow
graduated movement of the‘expanding wedge B
under the action of the 'springs I I. In this
form the yoke is shown as made in two parts
spaced from each other as indicated at 23* and
#10 having provisions for adjustably spacing the parts
of the yoke. The means shown for this purpose
comprise 'a screw 23h having an enlarged por
tion 23° threaded into one side of the 'yoke and
having a reduced portion 23d swivelled in the'
other side of the yoke. With this construction
the yoke members may be adjusted to the de
sired spaced position and may be held in this
position by means> of a lock nut 23°. This ad
justment may be specially useful when the ex
pander is being applied to a worn piston as it
enables the repairman'to adjust the yoke to se
cure proper relation between the piston and cyl
inder.
Having thus described the invention, what is
claimed as new and is desired to secure by Letters
Patent is:
'
' 1. A piston construction comprising an ex
against the cylinder wall but enabling a slow
restrained movement of said force-exerting means
as the wear progresses, said force-exerting and
wearable means comprising a pair of force-trans
mitting members straddling said connecting rod
and having openings through which `said wrist
pin extends, said spring means exerting force on 40
said force-transmitting members to cause wear
on the edges of said openings due to the rocking
movement of said wrist pin.
5. The combination of a piston having an ex
pansible skirt, a. member mounted in said skirt 45
and being free to oscillate therein, an expander
element having a portion thereof in wear-en
gaging relationship with said member and hav
ing another portion engaging said expansible
skirt, and resilient means engaging said ex
50
pander element to urge the same into engagement
with said skirt as said expander element wears in
use.
.
-
»
6. In a piston having an expansible skirt, means
mounted therein in free oscillating relationship 55
thereto, other means contacting said expansible
skirt and arranged in wear-engaging relationship
pansible cylindrical piston for operating in a
with said first-mentioned means; and resilient
cylinder, a~ wrist pin rockably mounted with re
60 spect to said piston, means exerting force to ex
pand said piston. and wearable means controlled
in its action by wear accompanying the rock
means engaging said second-mentioned means
and tending to preserve said contacting relation
ship as said second-mentioned means wears in use.
7. An expanding piston construction compris
ing movement of said wrist pin preventing the
force of said force-exerting means from being
ing a piston having an expansible'skirt, a mem
exerted to such a distance as to press the piston
movement with respect thereto, expansion-con 65
against the cylinder wall but enabling a slow
restrained movement of said force-exerting means
as the wear progresses.
ber carried by said piston mounted for relative
trolling means in wear-engaging relationship with
respect to said movable member and in expansion
controliing relationship with respect to said ex,
2. A piston construction comprising an ex
>pansible skirt, said expanding piston construction
pansible cylindrical piston for operating in a
cylinder, a wrist pin rockably mounted with
respect to said piston, spring means exerting force
having means for urging said expansion-con
to expand said piston, and wearable means con-trolled in its action by wear accompanying the
relationship with respect to said expansible skirt.
rocking movement of said wrist vpin preventing
trolling means into wear-engaging relationship
with said lmovable member and into expanding
WESLEY WILSON.
70
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