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Патент USA US2108724

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Feb. 15, 1938.
l
G. NEMETZ _
LABYRINTH PACKING FOR BEARINGS
Filed Deo. l2, 1936
§
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2,108,724l
Patented Feb. 15, 19381 `
l N.2,108,724
A
UNITED STATES y PATENT oE-FlcE
LABYRINTH PACKING FOR BEARINGS
Gustav Nemetz, Vienna, Austria. assigner to the
firm Alex. Friedmann, vienna, Austria
>Application December 12, 1936, serial No. '115,627 ` v
In Austria December 21. 1935
f
1
_
4
Claims.
This invention relates to »bearings and more
particularly to labyrinth packings forming a sealat the end of the bearing through which the ro- -
tating shaft passes outwards, so as to prevent
5 dust, water or'the like from entering into the
bearing.
.
'
Ó In such labyrinth packings which comprise a
plurality of stationary ringsand' a plurality of
rotating rings inserted between the flrst‘named
l0 rings, the >gaps provided between these rings
y should be as narrow as possible along their whole
’ periphery so that the rotating and stationary
rings are- just eii'ectively prevented from coming
into contact with each other.A Difficulties, how
15 ever, arise in the event which may occur some
times owing to the conditions of working that the
lining of the bearing brass gets hot and melts
during operation so that the casing of the bear
ling together with the stationary rings drops for
n a distance equal to the thickness of- this lining.
Fig. 1 is a vertical longitudinal section through
the
bearing,
v
‘
'
»
»
'
Fig. 2 isa vertical cross-section `according to
line 2-2 in Fig. l and '
4
Fig. 3 is a partial horizontal longitudinal sec- _5
tion according to line 3-2 in Fig. 2, showing¢ the
end of the bearing provided with the labyrinth
packing.
,
‘
'
As shown in the drawingfthe bearing com- _
prises a casing consisting ofthe upper part I and l0
the lower part I1 >and the brass 2, 21 and the in
terior lining 3, 31, the brass and the lining being
likewisesubdivided into two parts. The laby
rinth packing comprises the stationary rings 4, 41
and 5, 51 formed on the parts of the casing I, I1 15
respectively, and the rotating rings 6, 61, 1.1.11 and
8, 81 formed on the upper half 9 and the lower
half4 91 of a labyrinth casing respectively. On
these halves 9, 91 connected together by means
of bolts I0, there are provided annular ribs II, 20 _
II the gap or gaps between the rings are too nar-. I|1 the lateral surfaces of which engage with a
-rowv under these Vcircumstances the stational'i1 ~ close iit into corresponding annular grooves I2,
rings would come into contact with the rotating
rings whereby the bearing may be heavily dam
25 aged.> Such conditions exist for instance in the
axle bearings of railway vehicles.
A further diñiculty arises in respect with the
attachment of the labyrinth packing to the ro
tating shaft. Usually the rotating rings of the
$0 labyrinth'packing are secured to the hub of a
wheel or disk carried by the shaft immediately
adjacent to the bearing. In collar bearings not
only the casing ofthe bearing, but also the meni
|21 formed in the hub I3 of a wheel I4 carried
by the shaft or axle I5.
'
As will be seen from Figs. 1 and. 3, the lateral 25
surfaces of the rib II, |I1- and of the groove I2,
|21 run perpendicularly tothe axis of rotation
and alter tightening the screws I0 an oil-tight
connection is established between the hub I3 and
the labyrinth casing 9, 91, this connection pre- 30
venting any axial displacement of this‘ casing
relatively to the hub. 'I'he rib II, ||1 engages
into the groove I2, |21 in such a manner that
ber carrying the rotating rings of the labyrinth
with the halves of the labyrinth casing 9, 91
and oil-tight manner..
from the same so as to extend into a hole Apro
vided in the lower part 91 of the labyrinth casing. 40 , ’
a5 must -,be subdivided into two parts in orderl to iìtted together, a small clearance is still left be- ' 35
allow assembling or dismounting of the labyrinth ' tween the circumference ofthe rib ||_, | I1 and the
,
packing and itis somewhat diñicult to secure the bottomof the groove I2, |21. y
A bolt vI6 screwed in_to the wheel Il projects
two halves of this member to said hub in a simple
.
'
An object of the present invention is to pro
40
vide a labyrinth packing for bearings, wherein`a
narrow gap is provided between the rotating and
stationary rings along the whole periphery of the
same, the arrangement being such that when the
45 stationary rings drop for the reasons above re
ferred to, a contact between the rotating and sta
tionary rings is eiïectively prevented. A'further
By this means this casing is prevented from ro
tation relatively to the hub I3 also in the case
wherein the friction existing between the rib Il,
I|1 and the groove I2, |21 would not be suill
' cient to prevent such rotation itself.
45
As shown in Fig. 2, the stationary rings, as well
as the rotating rings are substantially circular
object of the invention ls to provide a labyrinth . and coaxial with one another, but the inner sides '
packing wherein subdivided rotating rings are A'of the upper halves 4 and 5, and the outer sides
oo secured to the hub of a’disk or wheel carried by of the lower halves 41 'and 51 of the stationary 50
the shaft immediately adjacent to the bearing, in rings recede from the circular form so that the width of these rings diminishes` from the points
>aA simple-and oil-tight manner.
~
An embodiment of the present -invention is situated in the horizontal plane containing the
illustrated by way of example in the accompany-_ axis of rotation, in the direction to the upper
.s ing drawing, in which
most and lowermost points of these rings. By 55
2,103,724 `
these means lunular spaces l1, I8, I9, 20 are
2. In a bearing a labyrinth packing comprising
formed between the stationary and rotating rings, circular rotatingV rings and circular stationary‘
these spaces being of such width that when the
rings inserted between and coaxial with said ro
lining 3, 31 of the bearing is melting and the cas
tating rings, the width of said stationary rings
decreasing from the points situated in the hori-A
zontal plane containing the axis of rotation, _up
ing I, Il together with the stationary rings 4, 41
and 5, 51 drops therefore for about the thickness
“x” of the lining, these rings are allowed to enter
wards and downwards so as to form luliular
into said lunular spaces to such an extent that v4»spaces between the stationary and rotating rings.
gaps are still left which just prevent a contact
10' between the stationary and rotating rings.
The vertical width of the lunular recesses of
3. In a collar bearing a labyrinth packing com- _y
prising rotating rings, stationary rings inserted
10
between the rotating rings, a.' carrier for said ro
the stationaryrings 4, 41 and 5, 51 is preferably , "tating rings, subdivided into two parts, a mem
made equal to the thickness of the lining of the ber carried ,by the shaft adjacent to the bearing,
bearing brass plus a minimum addition, whereby said carrier and said member being provided with
15 the smallestpossible width of the above-men-- an annular groove and an annular rib respec
tioned labyrinth gap is determined.
tively, the groove and rib engaging with one an
As it is to be seen from Fig. 2, narrow gaps, as
indicated at 2|, 22, 23, and 24 are provided along
the whole periphery of the rings so that the
20 tightening or sealing eiîect of the labyrinth pack
ing is substantially the same along its whole
ì
periphery.
W'hat I claim isz-
other so as to prevent the said .carrier from being
axially displaced relatively to said member.
,
4. In a collar bearing a labyrinth packing com
prising rotating rings, stationary rings inserted
20
between said. rotating rings, a. carrier for 'said
rotating rings, subdivided into two parts, a mem- ~
-
ber carried by the shaft adjacent to the bear
1. In a bearing a labyrinth packing compris ' ing, said carrier and said member being provided
25 ing circular rotating rings and circular station
with an annular groove and an annular rib re or
1"
ary rings inserted between and coaxialvwith said spectively, the groove and rib engaging with one
rotating rings, the inner sides of the upper halves, another so as toA prevent the said carrier from
and the outer sides of the lower halves of the being axially 'displaced relatively'to said member, 1 ' l
stationary rings receding from the circular form and means secured to said member and engaging
so that the width of the stationary rings dimin
with the _carrier to prevent the latter from being 30
ishes from the points situated in the horizontal rotated relatively to said member.
'
plane containing the axis of rotation,vupwards
.and downwards.
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