Патент USA US2108724код для вставки
Feb. 15, 1938. l G. NEMETZ _ LABYRINTH PACKING FOR BEARINGS Filed Deo. l2, 1936 § \ NN l,il»,_. O 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.