The end wall 17 is formed with two concentric annular tongues 26, 27 on the side remote from the webs 18. 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. No. SKF TS 64 - LABYRINTH SEAL € 513,46 per Piece (VAT inclusive) € 424,35 excl. Seals can be customized for use with competitor housings. 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. Different constructions of labyrinth seals according to the invention, incorporated in end cap bearing assemblies for conveyor rollers, will now be described, by way of example, with reference to the accompanying drawings, in which: FIG. 7 is provided with a cylindrical sleeve 19 identical to that of the end cap assembly of FIG. 1. VAT Available to ship in 9 days (delivery may take longer due to Covid-19 measures) Lip seals are usually made of nitrile rubber or polymer material, although felt seals are still commonly used. Also, the tongue 105 has a cylindrical surface 114 which co-operates with the frusto-conical surface 115 on tongue 103 to form a portion 116 of the passageway in which the walls diverge in a direction leading towards the outer end of the passageway. up to the ratings specified in the SKF General Catalogue, non-rubbing seals must be used, mainly gap type or labyrinth seals. 11 and 12 so that foreign matter in the labyrinth passageway is urged towards the outer end of the passageway by both centrifugal force and the squeezing action between the diverging walls of the relevant portion of the passageway. SKF non-contact labyrinth seals provide an ideal solution. These interlock, to produce … In use, upon rotation of the housing 85, any foreign matter in the flared portions 92, 93, 94 will be circulated around the associated flared portion due to the frictional resistance with the housing, and will be urged radially outwards by centrifugal force. 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. 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. The benefit of this type of seal is that it is very effective in preventing dirt from entering the bearing. the speed of rotation, must be restricted. For the Pop Release bearing unit, this takes place at the same time as lubrication of the bearing through the grease nipple mounted on the bearing housing. Brand: SKF: Mfr Part No. View our price now > Alternatively, get a quote from our sales team Specification. Privacy Policy In order to minimise the frictional torque and the bearing temperature, the customer decided on a labyrinth type seal, in spite of the harsh external environment, which included dust and sawdust. 128,894, filed Mar. 11 . The peripheral speed at the contact surface should not exceed 8 m/s. & Terms of Use. When dirt particles come into contact with the seal, they are stopped by the stationary part and are flung off from the bearing unit by the outer rotating sheet steel part. It is believed that the reason why foreign matter is drawn into the labyrinth passageway when the walls diverge in a direction leading away from the outer end is that the tongues of a labyrinth seal are not always exactly co-axial, due to manufacturing tolerances, and that any such eccentricity, combined with diverging walls in a direction away from the outer end of the passageway, cause the labyrinth seal to act in effect as a positive displacement pump drawing foreign matter along the passageway away from the outer end thereof. 2. The difference between the two angles should be such that there is little or no risk of the surfaces of the flared portion of the passageway diverging in a direction leading away from the outer end of the passageway in the event of deflection of a shaft supporting one of the members under load, or due to an accumulation of manufacturing tolerances. The new SKF Pop Release bearing unit has a reinforced labyrinth seal designed to give high performance while operating in heavily contaminated environments.Rubbing seals are the most common type of seals for bearings mounted in bearing housings. The seal consists of three parts which are made of sheet steel and are pressed together. The SKF Taconite Seal is supplied with a grease fitting for the grease purging of the labyrinth. A labyrinth seal is a seal which creates a complicated path for liquids to pass through, making it challenging for liquids to cross the barrier created by the seal because they have difficulty making their way all the way through the labyrinth. Flinger action – the rotating labyrinth ring flings water away from the seal. 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. 9 and 10 so that foreign matter in the labyrinth passageway is urged towards the outer end of the passageway by both centrifugal force and the squeezing action due to the eccentric movement of the tongues on the housing. 4. The end cap assembly shown in FIG. generation. Since however the portion 53 of the passageway adjacent the open end 51 is flared outwards, the foreign matter circulating around the portion 53 will be urged by centrifugal force towards the open end 51. 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. As in the arrangement of FIG. The grooves or ridges are of course only applied to the rotating member of the labyrinth seal. For the last 110+ years, CR Seals has been setting performance and service life standards for industrial and automotive shaft seals. 10 is an end elevation view of the end cap bearing assembly of FIG. 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. The end of the sleeve 19 remote from the bight portion 20 is formed with a radial flange 21. 8, the tongues on the housing may be arranged eccentric with respect to the tongues on the end cover as in the arrangement of FIGS. In order to use rolling bearings at higher speeds, i.e. View our price now > Alternatively, get a quote from our sales team Specification. 1), currently well accepted on the American continent, has been developed to, SKF has received the Best Supplier of the Year from Traktionssysteme Austria (TSA) in recognition of its contribution to the success of the traction. Next day delivery for stock products ordered before 16.00 hours The radially outer portion 53 of the passageway 50 adjacent the open end 51 is defined by a frusto-conical surface 54 on the tongue 26 and a frusto-conical surface 55 on the tongue 36, so that the radially outer portion 53 is flared radially and axially outwards relative to the axis of the end cap assembly. For higher speeds, SKF developed a radial labyrinth seal. 12. Alternatively, in the end cap bearing assembly of FIG. The permissible misalignment of labyrinth seals is normally around 0.5 degrees. SKF Taconite seals are designed for use with SAF series pillow blocks and is used to retain lubricant and protect against contamination. 9, FIG. All the tongues 103-106 are of circular section in a plane normal to the axis of the shaft 73, and the tongues 105, 106 on the end cover are concentric with the axis of the shaft. CR Seals has also been part of SKF since 1990, a span during which we’ve developed new materials, manufacturing processes and designs to create some of the most robust seals … The end cap bearing assembly of FIGS. 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. 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. At least a portion of the passageway is defined by frusto conical surfaces on the annular tongues arranged to exert centrifugal force on any foreign matter in the passageway upon relative rotation between the two members so as to urge the foreign matter towards the outer end of the passageway. For applications where there are high speeds or extreme temperatures, SKF recommends using labyrinth seals. The annular recess 45 between the tongue 38 and the cylindrical flange 39 on the cover is filled with grease for lubricating the bearing, the seal 13 preventing escape of the grease through the labyrinth. United States Patent 4458957 . Labyrinth rings, mounted on the shaft, form a multi-stage labyrinth seal with the housing seal grooves. Labyrinth seals protect against contaminants while still being capable of relatively high operating speeds. It is known from French specification No. SKF installation instruction animation to explain the easy installation of HRS and HSS split seals in wind turbine main shafts step by step. All India; Hyderabad; Howrah; Delhi; Mumbai; Labyrinth seal Assemble XRP- 1043 ₹ 5 Lakh/ Piece Get Latest Price. FIGS. & Terms of Use. An additional requirement was that it should be possible to displace the seal axially by around 2 mm. Brand: SKF: Mfr Part No. The high friction causes a rise in temperature in the bearing housing and results in higher energy consumption. 8 comprises a housing 85 fitted with a ball bearing 11, and an end cover 86 which co-operates with the housing to form an annular labyrinth passageway 87 between two annular tongues 88, 89 on the housing interleaved with two annular tongues 90, 91 on the end cover. This SKF ready-to-mount pillow block housing with inch dimensions has a housing made of cast iron and has two mounting bolts, a spherical roller bearing insert, and labyrinth seals. After rigorous tests at the SKF laboratory in King of Prussia, Pennsylvania, the seal design found to be best suited is that shown in figures 1 and 2. Seals for SNL plummer block housings. 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. Seal selection depends on many factors, including operating speed and temperature, required service life, and level of potential contamination. Sealing effectiveness increases with the number of washer sets and can be further improved by incorporating flocked washers. 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 end cap bearing assembly of FIG. Similarly the tongue 104 has a cylindrical surface 110 which co-operates with a frusto-conical surface 111 on the tongue 105 to form a portion 112 of the passageway in which the walls diverge in the direction towards the outer end of the passageway. The highest admissible peripheral speed of a radial lip seal is normally around 7-8 m/s. Photo 1shows the SYT 45 FTS Pop Release bearing unit incorporated into a wood working lathe for handicrafts. TS 34, SKF, Labyrinth seal Metric, Seal, Labyrinth seals. 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. 10, 1980, now abandoned. 2). Its disadvantage is that the seal generates a great deal of heat due to the high frictional torque between the seal lips and the part with which they are in contact, such as the shaft. 4. Near Me. 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. In its standard version, the latest Pop Release bearing unit is supplied with a double-lip seal made of nitrile rubber known as TriGard. Labyrinth seals are constructed in multiple pieces. TS 40, SKF, Labyrinth seal Metric, Seal, Labyrinth seals. 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. What is a Labyrinth Seal? Most PTFE seals are supported by metal springs or elastomeric rings to assure good shaft contact. 9 and 10 comprises a housing 100 fitted with a ball bearing 11, and an end cover 101 which co-operates to form an annular labyrinth passageway 102 between two annular tongues 103, 104 on the housing interleaved with two annular tongues 105, 106 on the end cover. The foreign matter will also be subjected to centrifugal force due to circulation movement around the flared portion. The seal is reinforced with an outer sheet guard to enable it to withstand environments which are highly contaminated with hard and abrasive particles, such as gravel, sand and wood chips. 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. The labyrinth rings are made of steel and have two radially arranged labyrinth steps that form a narrow sealing gap with the housing grooves. 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 outer tongue 26 on the housing may be provided with an axial flange 60 defining a cylindrical outer surface 61 at the open end 51 of the passageway. FIG. 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. We manufacture Labyrinth Seal ring for Bowl Mill XRP - 1043. Upon rotation of the housing, the lobes on the tongues 132, 133 squeeze any foreign matter against the opposing walls on the end cover and thereby force the foreign matter along the diverging walls of the associated portion of the passageway in the direction leading to the open outer end of the passageway. The radially outer surface 120 of the tongue 103 on the housing will of course be concentric with respect to the shaft 73 since this surface supports the end of the flange 19 when the flange and the end of a roller tube are swaged onto the housing. 6. In use, any foreign matter which enters the narrow passageway 50 through the open end 51 will normally come in contact with the wall of the passageway defined by the housing 10 and, upon rotation of the housing, the frictional resistance between the foreign matter and the housing will cause the foreign matter to circulate around the annular passageway 50. 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