The peripheral speed at the contact surface should not exceed 8 m/s. The end cover 12 is also made of resilient plastics material, preferably unfilled nylon, and comprises an annular disc 35 formed on one side with three concentric annular tongues 36, 37, 38 and a cylindrical flange 39 at the centre of the disc 35. 11 is a cross sectional side elevation of an end cap bearing assembly incorporating another construction of labyrinth seal adapted to operate as a positive displacement pump to eject foreign matter, and. It is known from French specification No. 3 is a view similar to FIG. A non-contact labyrinth seal is a type of mechanical seal designed by layering together metal sealing plates that combine to form a bunch of angles in a “maze-like” pattern. Since the maximum operating temperature that the seal materials and the grease in the bearing can withstand is around 100 –C, the peripheral speed at the seal contact point, i.e. 4, 5, 6 show modified constructions of the labyrinth seal of FIG. 11 . 2. The labyrinth seal of the invention is particularly suitable for sealing the bearings in end cap assemblies for conveyor rollers which in operation may frequently be subjected to dust, dirt and water. FIG. The annular tongues 88-91 have frusto-conical flanks and are arranged so that the three portions 92, 93, 94 of the passageway formed between the flanks of the annular tongues are each flared radially outwards in the direction of the passageway leading towards the radially outer end 95 thereof. As a result, the maximum permissible rotational speed of the bearing is also restricted. generation. 7 comprises a housing 70 fitted with a ball bearing 11, and an end cover 71 which co-operates with the housing to form an annular labyrinth passageway 72 therebetween. The permissible misalignment of labyrinth seals is normally around 0.5 degrees. TS 52: Acorn Code: TS52-SKF : HS Code: 8482 99 00 90: COO: SE: Qty: − + View our price now > Alternatively, get a quote from our sales team Specification. The radially inner wall of the open end 51 of the passageway may then be formed with a cylindrical surface 62 on the tongue 36 of the end cover as shown in FIG. The ball bearing 11 comprises an outer bearing ring 30, an inner bearing ring 31 and balls 32 in rolling engagement with grooved tracks on the rings 30, 31 so that the bearing is capable of resisting radial forces and axial forces in both directions. The labyrinth passageway may comprise portions which are flared in the direction towards the outer end of the passageway, and the annular tongues on one of the members arranged eccentric or non-circular so that the two members exert a pumping action on any foreign matter in the flared portions of the labyrinth passageway upon relative rotation between the two members. The end cap assembly of FIG. Thus according to the invention there is provided in an apparatus including bearing means permitting relative rotation between two components of the apparatus about an axis of one of the components, said components defining an annular space accommodating said bearing means, a device for providing a labyrinth seal for said annular space comprising two annular members mounted one on each of said components, said members having annular tongues which are interleaved to define a narrow annular tortuous labyrinth passageway between the members along the entire length of the labyrinth passageway, said passageway having an inner end leading to said annular space and an outer end leading to the exterior of the apparatus, wherein at least one tongue on each member has a frusto-conical surface and at least one portion of the labyrinth passageway is defined by said frusto-conical surfaces, said frusto-conical surfaces extending radially outwards in the direction along the passageway leading to said outer end thereof, whereby any foreign matter circulating around said one portion of the passageway upon relative rotation between the members will be urged by centrifugal force towards said outer end of the passageway, and the radially outer one of said frusto-conical surfaces forming said one portion of the labyrinth passageway is inclined relative to said axis at a greater angle than that of the radially inner one of said frusto-conical surfaces forming said one portion of the labyrinth passageway relative to said axis so that said one portion is flared radially outwards. Catalogue item no 1: TS 60 Compare Please login to see prices: Stock item. © 2004-2021 FreePatentsOnline.com. This construction has the advantage that the flange 60 shrouds the open end of the passageway 50, particularly when the end cap assembly is operating with its axis horizontal. FIG. The inside diameter of the metal ring contains an O-ring that creates an interference fit with the shaft so that the ring will rotate with the shaft. United States Patent 4458957 . Sealing effectiveness increases with the number of washer sets and can be further improved by incorporating flocked washers. The flared portions of the passageway are however not for the purpose of avoiding any diverging of the walls from the mouth in the event of tilting of the seal members when the shaft is under load, but for the purpose of obtaining a rubbing seal between the tongues when the two seal members are moved towards one another. The end of each groove remote from the open end 51 of the labyrinth passageway is closed by a step between the base of the groove and the surface 54, and the end of each groove adjacent the open end 51 is chamfered to permit free flow of any material out of the groove when subjected to centrifugal force upon rotation of the housing. Catalogue item no 1: TS 56 Compare Please login to see prices: SKF Labyrinth seal for large SNL plummer block housing TS 60 ERIKS Item #: 23770744. 4. 7 has the advantage over that of FIG. This complex maze-like pattern prevents contaminants and splashing liquids from hitting the bearing. Near Me. In the operation of such seals, it occassionally happens that foreign matter which enters the outer end of the passageway is drawn further into the passageway upon relative rotation between the two members. A cylindrical sleeve 19 surrounds the wall 16 and is connected thereto at the end remote from the end wall 17 by an annular bight portion 20 of U-shaped cross section, to form a spring support for the end cap assembly. Privacy Policy 12. 2 showing a modified construction of the labyrinth seal. Labyrinth seal - SKF TSN 314 S. Large stock and sharp prices. 1 and like parts are identified by like reference numerals in the two Figures. The benefit of this type of seal is that it is very effective in preventing dirt from entering the bearing. The labyrinth seal between the housing and the end cover is shown more clearly on a larger scale in FIG. The present invention arose from the discovery that the phenomena of foreign matter being drawn further into the labyrinth passageway occurred when the walls of the passageway diverged slightly in the direction away from the outer end of the passageway, due possibly to a slight tilting of one or both of the members of the seal due to deflection of a supporting shaft under load, or due to accumulation of tolerance errors in manufacture. The housing 70 of FIG. This is a continuation of application Ser. Next day delivery for stock products ordered before 16.00 hours The angle α between the frusto-conical surface 54 and the rotational axis of the housing is preferably large enough to ensure that foreign matter in the flared portion 53 will slide along the frusto-conical surface 54 and be discharged through the open end 51, that is the tangent of the angle should be greater than the maximum possible coefficient of friction of any foreign matter likely to enter the passageway 50. About 8% of these are Housings, 59% are Material Handling Equipment Parts. Good sealing performance requires the seal to operate at high contact pressure, which generates a large amount of frictional heat. Any foreign matter in portion 94 will thus be forced into portion 93, the foreign matter in portion 93 will be forced into portion 92, and the foreign matter in portion 92 will be thrown out of the open end 95 by centrifugal force. Alternatively, the surface 54 may be provided with longitudinal ridges 65 and a circumferential rib 66 closing off the radially inner ends of the channels formed between the ridges, as shown in FIG. The housing 10 is made of a resilient plastics material, preferably glass fibre reinforced nylon, and comprises a cylindrical inner wall 15, a cylindrical outer wall 16 surrounding the inner wall 15, an end wall 17 integral with adjacent ends of the walls 15, 16, and a plurality of radial webs 18 spaced around the housing and extending between the inner and outer walls 15, 16, the webs 18 being integral with the walls 15, 16, 17. Abstract: A bearing assembly has two relatively rotatable members formed with annular tongues which are interleaved to form a labyrinth passageway seal between the two members. Seals for SNL plummer block housings. The centrifugal force on foreign matter in portion 58 will urge the matter in the direction leading to the portion 53 in which the foreign matter will be thrown to the open end 51 as described above. Photo 1shows the SYT 45 FTS Pop Release bearing unit incorporated into a wood working lathe for handicrafts. TS 34: Acorn Code: TS34-SKF : HS Code: 8482 99 00 90: COO: SE: Qty: − + in stock. The angle α may for example be 2° larger than the angle. This purges the labyrinth of contaminants and helps block the entrance of contaminants. Labyrinth seals are constructed in multiple pieces. 7 is a cross sectional side elevation of an end cap bearing assembly for a conveyor roller, incorporating another construction of labyrinth seal adapted to throw out foreign matter by centrifugal force. It is a split-pillow (plummer) design consisting of a cap and base. This non-contact seal has no wearing parts and eliminates fretting caused by conventional lip seals. The highest admissible peripheral speed of a radial lip seal is normally around 7-8 m/s. 1230578 to provide a conveyor roller having a labyrinth seal formed by two members having interleaved tongues, in which the labyrinth passageway has flared portions diverging in the direction towards the mouth of the passageway. Used by itself, PTFE, even when compounded with fillers, may creep under load and reduce sealing force. Labyrinth Seals - Lip Seal Alternative An effective alternative to lip seals, Chesterton offers a unique polymer-based labyrinth seal design for use in splash applications for protection of pumps, gearboxes and other rotating equipment. The end of the cylindrical inner wall 15 remote from the wall 17 is formed with an annular step 22 forming an abutment for the bearing 11, and a further end wall 23 integral with the step 22 extends radially inwards. The device according to the invention may be arranged so that the frusto-conical surfaces defining the flared portion of the labyrinth passageway are circular in cross section normal to the axis of the seal with one frusto-conical surface eccentric relative to the other frusto-conical surface, whereby the two surfaces form a positive displacement pump operable upon relative rotation between the members to pump foreign matter in the flared portion along the passageway in the direction leading to the outer end of the passageway. The end of the sleeve 19 remote from the bight portion 20 is formed with a radial flange 21. 1 shown on a larger scale. The present invention consists in so designing the labyrinth seal that, upon relative rotation between the seal members, at least part of the labyrinth passageway acts as a centrifugal pump which drives any foreign matter along the passageway in the direction of the outer end of the passageway, despite any slight tilting of the seal members due to deflection of the supporting shaft. The centrifugal force is however sometimes insufficient to prevent foreign matter being drawn further into the passageway upon relative rotation between the two members of the seal. 5, 6 show modified constructions of the end wall 17 is formed a... Improved by incorporating flocked washers elements for both rotating and static applications of SKF Taconite seals are usually made sheet. Cross sectional side elevation of the end cap bearing assembly of FIG Delhi ; Mumbai labyrinth... Against contamination it should be possible to displace the seal axially by around mm. 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