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Патент USA US2403397

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July 2, 1946.
'
'D, R RANKIN
LUBRICATION
SYSTEM
Filed Oct. 19, 1942
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37
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' 2,403,397v
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2 Sheets-Sheet l
July 2, 1946.
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D, R, RANKlN
4
2,403,397
LUZBRICATIOIZI SYSTEM
Filed Oct. 19, 1942 ‘
757425
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i .2 Sheets-Sheet 2
90
53
II
Patented duty 2,. igd?
curred srmras PATENT osric
2.403.391 '
LUBRICATION SYSTEM .
Dan R. Rankin, Los Angeles, Calif., assignorvto
Food Machinery Corporation, San Jose, Qaliii,
a corporation of Delaware
1
‘Application October 19,~1942, Serial No. 462,485
7 Claims. (01.308-93)
'.
V
This invention relates to the lubrication art
and particularly to pressure lubrication systems.
It is an object of this invention to provide a
novel pressure. lubricating system suitable for use
on the bogie wheels of military tanks.
‘
_
..
2
. I;
Fig. 4 is a view similar toiFlg. 3 and illustrates ''
the ?nal step in the assembly cf_said/cyliinder.
vEig. 5 is a longitudinal view illustrating a modi
' '?ed form of the’invention.’
Such tanks operate in the presence of large 5
.
Referring speci?cally to the drawings, the bogie
wheel I0 is shown therein as including an axle
amounts of abrasives, that is, sand and dust,
M, an outer wheel structure l2, and a pair of
and if amphibious must operate also frequently
bearings |3 by which the outer structure I2 is
in the water, and it is essential that no abrasive
mounted on the axle ||.
. ‘
or‘water be admitted into the bearings of these 10
Also disposed betweenthe axle ii and outer
wheels.
’
‘
structure I 2 are lubricant retaining seals I4.
It is accordingly another object of my inven
Axle | | comprises'a piece of'steel' shaftlng 20
tion to provide a pressure lubrication system suit
provided
with annular bearing shoulders 2| and
able for use in bogie wheels which will completely
having a bore 22 formed axially therein through~
exclude all foreign substances from admission into 15 - out
its length. Opposite ends of the bore 22 have
the bearing structure of the wheel.
'
counterbores
23 and 26 provided with tapered
While attempts have been made to accomplish - ’
threads
25
and
26 respectively. Formed radially
the foregoing object by applying pressure to a
in the piece of shafting 20, midway between its _
lubricant inside a wheel, the pressure thus ap
ends and communicating between the bore 22
plied has varied substantially with ?uctuations
in the atmospheric temperature. Unfortunately, 20 and the exterior surface of the shafting, is a
the higher vtemperatures not only increase the
pressure placed on the lubricant but increase the
?uidity of the lubricant so as to re's'ultin undue
hole 21.
'
Th'e'outer wheel structure l2 has a hub portion
30 having af'central bore 3| at opposite ends of
which'are shoulders32 which lie in planes spaced
I
apart a slightly less- distance than the bearing
Then, when relatively low temperatures are 25I shoulders
2| on the shaft 20. , The bearings |3
encountered or a rapid drop in temperature takes
fit inwardly snugly against the shoulders 2| and
place as when plunging into Water after travelling
are held in place by sleeves 33 which are pressed
over desert landfa subatmosphericipressure can
.over the opposite end portions of the shaft 20
loss of the latter in very hot weather.
develop within the wheel which will suck dirt or 30 against the inner races of the bearings “l3.
mud into the wheel bearings. If this occurs the
bogie wheel bearings wear out much earlier than
The
sleeves 33 have non-corrosive bushingsy36 dis
they otherwise would, thus deprivingl'rour armed
forces prematurely of the furtherqiuse of those
posed
Threaded
adjacent
counterbores
to the bearings
31 areI3.provided
- infop~
posite
ends
of
the
bore
3|
and
the
seals
M are
tanks which are equipped with these bearings.
5 screwed into these counterbores so that lubricated
It is a further object of my inventionto provide
sealing rings 38 thereof come into snug sealing en
a pressure lubricating system suitable for use in
gagement with the outer surface of the bushings
bogie wheels in which pressure applied to the
36. One of the seals I4 is utilized to bind the
lubricant is substantially unaffected by ?uctua
outer race of the adjacent bearing l3 against
tions in surrounding temperatures.
40 the, adjacent shoulder 32 of the wheel hub 30;
The manner of accomplishing the foregoing
bearing thus takes up axial thrust shocks to
objects as well as other objects and advantages . ‘ This
which the wheel I ll is subjected.
will be made manifest in the following description
\. The space between the bearings I3, Within the
taken in connection with the accompanying draw
‘borejl and outside the/axle H, constitutes a
‘mgs in which
Rf"
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Fig. 1 is an elevational view of a bogie wheel
with the central portion thereof in section to illus
;rate the structure and mode of operation of a
Jreferred embodiment of the invention with
vhich said wheel is equipped.
'
-
45 lubricant ‘chamber 39.
v . Mounted in the bore 22 of the axle H is a
lubricant pressure element 50. This element has
a base plug 5| which screws into the threads 26.
This plug has a central/‘hexagonal opening 52
. Fig. 2 is a longitudinal sectional view of the 5,0 and a central threaded opening 53 which com
>ressure cylinder of the invention at an inter
nediate stage of its assembly.
‘Fig. 3 is a view similar to Fig. 2 showing the
lext step in the assembly of said cylinder.
_municates_ with a hole 54 formed transversely
therein, opposite‘ ends of which open into the
counterbore 24. The inner end of the plug 5|
is turned down to form a cylinder head 55 which
65 ‘extends into and closes one end of a tubular
2,403,897
4. Except for thespace occupied by the grease
the plunger 10 and the head 90, the space between
55in the cylinder chamber 6| is now completely
evacuatedof air. That is, it is occupied by a_
brazed or
cylinder 56, the lattertobeing
soldered,
completely
close
the.tend
welded to the plug 5|
of the cylinder 56.
When the element 5|) is installedv as shown in
vacuum.
Fig. l, the cylinder 56 thereof extends through
into the axle bore 22 and the plug 5| screwed‘ '
give this cylinder the maximum practicable
plug 5| is a pressure release valve
snugly-into the threads 56 as shown in Fig. 1.
7
to release lubricant fromv inside the bogle wheel
|0 when pressure of this exceeds a given safety
factor. It is here to be noted that the outside
diameter of the cylinder 56 is less than that_of
the bore 22 so that free communication is mam
tained through the annular space 6|) between the.
_
.
The element 50 is now ready to be inserted
the bore 22 as far as the counterbore 23 so as to
length. Screwed into thethreaded hole
53 of the
59 adapted
'
'
Before being thus inserted, a certain amount of
grease is placed in the bore 22 so that when the
plug 5| is in place all the space in the. bore 22
surrounding the element‘ 56 is filled with grease.
_ A grease gun ‘is now applied to the Zerk ?tting
83 and grease is pumped through this ?tting into
the counterbore 23 from which it passes into the
cylinder chamber 6| .and compresses'the spring }
hole 21, the chamber 6| within the cylinder 56, .
and with the hole 56 and valve 56 in the plug 5|.
pletely compressed as shown in Fig. 3. ' The force
Compressed within the cylinder chamber 6| is
of injecting additional grease through the ?tting
65.- ‘This is continued untilsaid spring is com
a coiled expansion spring 65. The spring‘ 65 is v20 “will thus transmit an‘ excessive pressure to
‘
the safetyvalve' 59 causing grease to flow out
normally
much longer than the cylinder cham
ber 6| and is adapted to be compressed therein
wardly therethrough. The fitting 83 thus pre
vents an excessive pressure being transmitted
by application of a. plunger 16 tov the outer end
'
After the spring and plunger have
through the grease in vthe chamber 39 to the
of the spring.
_
thus been forced into the chamber 6|, a pm 1|. 25 grease retaining seals l4.
'
When thus assembled and charged with grease, ‘
is ?xed in the mouth of this, chamber to prevent
the plunger and spring from escaping.
I
Theplunger 16 may be of any suitable con
struction but preferably includes a pair of ?exible
b'ogie wheel I6 is assembled on a military tank
on the frame of the tank being
' by suitable clamps
cup washers v‘I2 which are trapped between .
applied to the sleeved ends of the ‘axle | i. During
the operation of the tank‘and the bogie wheel NJ,
?anged guide blocks 13 and a washer ‘H, all of 30 the latter will be lubricated vby grease replenished
by the operation of the spring 65 until the plunger
‘HI again comes to rest against the stop pin 1|.
The counterbore '23 zls closed by a plug 8|!
Throughout this period there'is no'need for at
screwed into the threads 25‘, this plug having a 35 'tention being given to the lubrication of this
hexagonal central opening BI and a threaded hole
wheel as the grease will be supplied under sub- ‘
82 in which is screwed a Zerk check valve ?t
stantially constant pressure to the bearings l3,
this pressure being always in excess of the at;
ting 83.
Operation
mospheric pressure outside ‘of the wheels H.
Thus a slight leakage of grease between the ‘pack
40
‘When the bogie wheel I6 is assembled the
ing material 38 and the bushings 36 will take
chamber 36 and hole 21 are ?lled with grease and
place but only su?lcient to washfrom the space
the plug 86 is screwed into place before the ele
between these elements any slight amount of
gment 50 is installed. Before explaining how this
abrasive which might be thrown against this por
is done'it will be necessary to describe the mode 45 tion of the wheel.
'
of assembly of this element.
'Furthermore it is to be noted that extremes
Prior to inserting the plunger ‘I6 intolthe cyl
of temperature to which the bogie wheel might
inder chamber 6|,»a quantity of grease 96 is placed ' be subjected during this period of its operation
will in no wise alter the action of the spring 65
in this chamber back of the plunger. This hav
‘spring 65 is compressed in the
and the amount of pressure which it places on
ing been done, the
to
' chamber 6|, the plunger 10 inserted and the pin
the lubricant‘ within the whee1 will at all times
1| secured in place to trap the spring and plunger
be substantially the same. This is because the
spring 65 is completely sealed from the outside
as shown in Fig. 2.
vThe unit 50 may then remain as thus shown
pressure and is surrounded by a vacuum.
until the time comes to install it in the bogie
The lubricant in the chamber 6| is of course
55
wheel It.’ At that time the unit 50 may be cooked
replenished at intervals by recharging the wheel
by the use of a rod 9| as shown in Fig. 3. This
through ?tting 83 in accordance with universally
rod‘ is extended into the chamber 6| past the stop
followed automotive lubricating practice. These
pin 1| into engagement with the plunger 10 so
.intervals are ?xed so that each wheel I0 is re
as to force this plunger toward the cylinder head
charged with grease before the plunger 16 comes
55 at the closed end of the cylinder until the 60 in contact with the stop pin 1|. Thus grease
which are held in assembled relation by a
screw 15.
.
‘
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g
‘ spring 65 is completely collapsed with itsadja
centcoils in contact with each other. The quan
.
is always fed to the bearings l3‘ under pressure
from the spring 65.
tity of grease 90 disposed in the chamber 6| is
sufficient so that before'the spring 65' has been
.
‘It is to be noted that if grease should leak
‘around. the plunger ‘I6 so that the element 50 will
thus collapsed all the space between‘the plunger 65 not receive its maximum charge of grease, the
10 and ‘the cylinder head 55 is ?lled with this
plunger ‘Ill can be reset by removing the plug
grease so that a'quantity 92 of this grease over
flows past the cup‘ washers 13 of “the plunger 10.
When the spring 65 has ‘thus been entirely
‘60 and applying a rod to plunger 10 as shown
-
inFig.3.
In Fig. 5 I have illustrated an alternative form
of the invention in which a core 95 is provided
in the closed end of a cylinder 96 which may be
substituted for the cylinder 56 of the element .56.
rod 9| permitting the spring 65 to expand and
The function of the core 95 is to occupy most
return the plunger 10 back to the position in
the space within the spring 65 when this is
shown-in
Fig.
15
of
which it engages the stop pin 1| as
collapsed so as to comprise a stop preventing
further movement of the plunger ‘Ill towards the
cylinder head '55, the pressure is relaxed on the
2,403,397
5
compressed as shown in Fig. 3, thereby obviating
the necessity of a relatively large- quantity of
grease 90 in the chamber 6| between the plunger
10 and the closed end of the cylinder.
What I claim is:
__
.
1. In a lubrication system for supplying lubri_
cant to a lubricant chamber, the combination of:
closed end, the open end of said cylinder being
adapted to communicate with‘ said chamber; a
cup plunger disposed in said cylinder and
adapted when lubricated to make an airtight ?t
therewith; an expansion spring in said cylinder
between the closed end thereof and said plunger,
said spring having su?’icient expansive strength means forming a cylinder having an air-tight
when- compressed to expand and force said >
closed end, the open end oi’ said cylinder being
toward the open end of said cylinder
adapted to communicatejwith' said chamber; a 10 plunger
against the pressure of the atmosphere; and a
cup plunger disposed in said cylinder and adapted
quantityof grease disposed within said cylinder
when lubricated to make an airtight ?t there
a to substantially ?ll the space located within the
with; and an expansion spring in said cylinder
coils of said spring and between said plunger
between the closed end thereof and said plunger,
and the closed end of said cylinder when said
said spring having su?lcient expansive strength 16 spring
is fully compressed
when compressed to expand and force said
plunger toward the open end of said cylinder
against the pressureof the atmcxsphere.
2. In a lubrication system for supplying lubri
cant to a lubricant chamber, the combination of: 20
means forming a cylinder having an air-tight
closed end, the open end of said cylinder being
adapted to communicate with said chamber; a
cup plunger disposed in said cylinder and adapted ,
when lubricated to make an airtight ?t there
with; an expansion spring in said cylinder be
.tween the closed end thereof and said plunger,
said spring having su?icient expansive strength
5. In combination: an axle adapted to rotat
ably support a wheel, said axle having an axial
bore extending therethrough to form a lubricant
chamber, and passage means to conduct lub'ricant
from said chamber to a wheel carried by said
axle; closures provided for opposite ends of said
bore; a tube provided on one of said closures
and ?tting loosely in said chamber; a plunger
in said tube; a spring in ‘said tube between said
25 plunger and the closure to which said tube is '
attached; a check .valve; and an escape valve, one
of said valves being provided upon each of said
closures, there being passage means provided
when compressed to expand and force said
placing each of said valves in communication
plunger toward the open end 01' said ‘cylinder
against the pressure 01' the atmosphere ; and stop 30 310th the space outside said tube and within said
means at the open end of said cylinder to re
tain said plunger therein against the expansive
force of said spring.
.
_6. In combination: an axle adapted to rotat
ably support a wheel, there being a bore extend
3. In a lubrication system for supplying -1ubri.. 35 ing axially through said axle to form a lubricant
chamber, there being passage means provided in
cant to a lubricant chamber, the combination of:
said axle to conduct lubricant from said cham
means forming a cylinder having an air-tight
ber to a wheel carried bysaid axle, the opposite
closed end, the open end 01' said cylinder being
ends
of said bore being internally threaded;
adapted to communicate with said chamber; a
screw plugs adapted to be received by said
cup plunger disposed in said cylinder and
threaded bore ends; a tube. provided on one of
adaptedwhen lubricated to make an airtight ?t
said plugs and adapted to be extended into said
therewith: an expansion spring in said cylinder
chamber when said plug is inserted in one end of
between the closed end thereof and said plunger,
said bore; a plunger in said tube; a spring in
said spring having sumcient expansive strength
said. tube between said plunger and the plug on
when compressed to expand and force said
which said tube is mounted; an intake check
plunger toward the open end- of said cylinder
valve; ‘and a pressure relief valve, one of said
against the pressure of the atmosphere; and a
valves being mounted in each of said cups to com
‘core oi’ incompressible material disposed within
municate with space within said bore about said
said cylinder to substantially fill the space located
tube.
within the coils oi.’ said spring and between said 60
7. A combination as in claim 5 in which said
plunger and the closed end 0! said cylinder when
closure on which said tube is mounted com
said spring is fully compressed.
’ '
pletely closes the end oi'said tube which is secured
4. In a lubrication system for supplying lubri
thereto thereby forming an air tight space be
cant to a lubricant chamber, the combination 01':
tween said closure and the plunger in said tube.
means forming a cylinder having an ‘air-tight
DAN R. RANKIN’.
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