Skf slewing bearings stock range recommended range ball design roller design lshape range ball design other standard items ball design roller design please note that stock items included in this leaflet do not represent our complete range and that new items may be added in the future. Xzwd is a leading china slewing bearing failure analysis manufacturer, supplier and exporter. The wormgear type slewing drive is developed by the slewing bearing. The slewing bearing generally has a lifting hole, which can be screwed into the eyebolt for safe lifting. We are perfect for every detail of the slewing ring bearing, guarantee the quality level, so as to bring you the perfect product experience. Refer to the table below for a guide to the service factor to apply to your application. Slewing ring bearings, turntable bearings fh slewing bearing. Timken bearing damage analysis with lubrication reference. Lowspeed and heavyload slewing bearings are applied broadly for major mechanical. Ronald shaw, bearing remanufacturing manager, kaydon bearings. In addition we manufacture a full range of slewing. Slewpros 30 series is a slewing ring bearing series with a rectangular cross section that offers a high degree of stiffness.
Slew ring bearings, slewing ring bearings, bearing manufacturer, supplier, exporter, for cranes, wind mills, mining industries, earth moving machineries, satara, maharashtra, india about us. Slew ring bearings are special types of bearings which are generally used in heavy machinery. While understanding the design and performance capabilities. China slew bearing rings manufacturers, slew bearing rings. Socare slewing bearing is a professional manufacturer and supplier of slewing bearing, slewing drive and slewing ring in qingdao,china. Combination of slewing bearing and slewing drive combination of. To determine if a slewing ring bearing is appropriate for an application, a service factor is applied.
Some of the premature failures experienced by slewing ring bearings can be prevented. Slewing bearings comprise an inner ring and an outer ring, one of which usually incorporates a gear. Pdf combined failure diagnosis of slewing bearings based. Kaydon bearing remanufacturing program white papers. Combined failure diagnosis of slewing bearings based on mckdceemdapen article pdf available in shock and vibration 2018. Slew ring slewing ring bearing bolts have a direct effect on bearing life, put simply if the bolt tension is incorrect or relaxes the bearing wear rate increases. Rotek slewing bearings are machine elements which absorb all axial and radial forces and the resulting tilting moments in a single selfretaining and readytoinstall unit. Attempting to remove such components by cutting the cone inner race may. The exposed nature of the slew bearing gearing can result in damage. The cranes slew ring bearing is a fourpoint angular contact single row ball. Slewing ring bearings bearings canada, the ball bearing. Slewing bearing slewing bearings are widely used, and the main structural types are singlerow four point contact ball slewing bearing, double row angular contact ball slewing bearing. Suffix es for stainless steel version 1 tolerance in accordance.
Externally geared version has a rectangular cross section outer ring and flanged inner ring. The bearing rings are supplied without gear teeth or, in order to achieve simple drive solutions, are available with external or internal gear teeth. Rigia bearings rigid bearings for industry robot automation specialized in small slewing ring, crossed roller bearings and harmonic drive output bearings. November 2011 more specifically, and for larger bearings, roth erde list the following information table 1. Xzwd is a leading china slew bearing rings manufacturer, supplier and exporter. The slew bearings shall be mounted in an unloaded condition. Failure spalled area moderately spalled area indicates fatigue failure usually referred to as spallingis the fracture of the running surfaces and subsequent removal of small. Application data sheet for slewing bearing arrangements. More than 96% of slewing ring failure could be avoided by following simple maintenance tips. All our production is perfectly under control and the matching of the rings and the rolling elements, gives batch after batch, the certainty to obtain the right bearing for this very demanding application. Timken bearing damage analysis with lubrication reference guide. Apply a liberal shot of extremepressure grease to the fittings around the bearings circumference at intervals recommended in the operators manual. When transporting the slew bearing take special care to avoid impacts with the unit. Comparisons and costeffectiveness the storage of slewing ring bearings is a somewhat undocumented necessity of critical spares in.
Eu made, turning slew ring bearing 250mm od 150mm id 34mm h, m6. Take care not to get any solvent into the slew bearing. M16 940 1100 660form16 metric isothread din as a3 fm fm fm n nm nm n nm nm n nm nm ma. Kavitsu slew ring bearings represent a technological marvel in the fields of mechanical power transmission systems. How to tell when a slewing ring bearing needs to be.
In this study, a method was proposed to denoise and classify the combined failure of. Kavitsu is a pioneer in manufacturing and supplying of planetary gear systems and allied products for last 22 years. High strength slewing ring bearing 30 series schedule a. Adhering to the pursuit of perfect quality of products, so that our slewing bearing failure.
The bearing rings are supplied without gear teeth or. This paper demonstrates a case of anexcavator slewing ring failure which is. The singlerow four point contact ball type slewing bearing is composed of two socket sleeves and is compact in structure view product. Apply a liberal shot of extremepressure grease to the fittings around the bearing s circumference at intervals recommended in the operators manual. The bearing raceways, in conjunction with the rolling elements and cages or spacers, are designed to accommodate loads acting singly or in combination, and in any direction. The slewing ring bearing is a new design, through excellent processing technology and highquality raw materials, the performance of slewing ring bearing up to a higher standard.
Slewing ring bearings technical turntable bearings. The difference between these type of bearings and normal bearings is that, they have higher pitch value diameter, the way they are mounted on the structures, working nature which is. The current product range includes slewing ring bearings. How to extend the life of your slewing ring bearings. A slew bearing system includes a first bearing ring and a second bearing ring concentrically positioned relative to each other forming at least upper and lower raceways there between, a. Pdf largesize and heavyload slewing bearings, which are mainly used in heavy. The crane turntable collapsed during the process of hoisting the crane load line before the tension on the slings was applied. Slewing bearing, china slewing bearing manufacturer and. The internally geared version has a rectangular cross section inner ring and a flanged outer ring. Slew bearing failure analysis kavitsu slew ring bearings. Pdf combined failure diagnosis of slewing bearings based on.
Owing to the complexity of the structures and working conditions, it is quite challenging to effectively diagnose the combined failure and extract fault features of slewing bearings. The crane slew ring connecting bolts had broken when the operator began to hoist the load line to tighten the web slings that were attached on the loadlifting lugs. The load rating curves shown in this catalog are approximate, and represent an application service factor of 1. Combined failure diagnosis of slewing bearings based on mckd. Adhering to the pursuit of perfect quality of products, so that our slew bearing rings have been satisfied by many customers. Together with attachment holes in both rings, they enable an optimized power transmission with a simple and quick connection between adjacent machine components. These instructions are divided into sections according to each of these. Rotek is the north american manufacturing leader of slewing bearings.
Avoid slewing ring bearing failure with these six maintenance. Indemnification clause the contractor shall assume all liability for and shall indemnify and save harmless the state of. The tower crane use a singlerow four point contact ball elements slewing ring 01 series and double row ball slewing bearing, dia. Premature failure is a common fate for largediameter e. How to correctly install and maintain the slewing ring bearing. A slewing bearing or slew ring is a piece of hardware used to facilitate circular movement, usually of a large device such as a crane. Ina slewing rings are also known worldwide as premium products in the field. The success of the rollix slewing ring is the result of the precision of our finishing by grinding. Permissible increase in bearing clearance for single row ball bearings track dia mm ball diameter mm 20 25 30 35 40. Use a solvent that will not damage the rubber seals of the bearing. A slew bearing system includes a first bearing ring and a second bearing ring concentrically positioned relative to each other forming at least upper and lower raceways there between, a plurality of bearing rollers positioned in each raceway between the first bearing ring and the second bearing ring, a plurality of delivery nozzles capable of delivering an air and oil mixture into the raceways.
Aug 03, 2017 single row ball slewing bearing with external gear applied for aerial platform. We supply highaccuracy slew rings, slew drive and gears. Severe brinell marks can cause premature fatigue failure. This type of failure is progressive and once initiated will spread as a result. This design allows just one bearing to receive loads in all directions including, radial, axial and moment. The starting torque required takes into consideration loads on the bearing and friction of the components. Tensile stresses can be very high in tightly fitted bearing components. Refer to the table below for a guide to the service factor to apply. Ru124uucc0x with the crossroller ring, cylindrical rollers are arranged crosswise. How to extend the life of your slewing ring bearings kaydon bearings. Shengbao road the third industrial part, tongshan economic development zone, xuzhou jiangsu, china, 221116. This selfstudy guide is programmed to increase performance productivity. Replacement of slew ring bearing i would like to know if anybody has an experience in replacing slew bearing of a stacker reclaimer 30 mtr boom without dismantling the luff superstructure. The bearings which can sustain the calculated hours of life operation are subject to wear which is natural.
An overview of different methods and their associated costs will be presented in this work. Slewing bearing manufacturer,slewing drive supplier,slewing. Main causes of wear of the slew bearing and the toothed race. Extreme design, quality raw materials, high performance and competitive price are what every customer wants, and thats also what we can.
We first became involved with these in 1995 on north sea offshore cranes. Single row ball slewing bearing with external gear applied for aerial platform. In big rotating equipment, such as cranes, excavators and tunnel boring machines, a slewing ring bearing must simultaneously handle a complex load spectrum that covers diverse combinations of thrust, radial and tilting moment loading. Any static overload or severe impact can cause brinelling. Largediameter slewing ring bearing storage methods. Slew ring bearings, slewing ring bearings, bearing manufacturer, supplier, exporter, for cranes, wind mills, mining industries, earth moving machineries, satara. New dyco swing bearing for case cx5sr tier iii updated. Spalling can occur on the inner ring, outer ring, or balls. Finite element methods fem as well as failure mode effects. It is composed of housing, a turbine ferrule, a view product. For repeatable precision with minimal downtime, specify rugged slewing ring bearings from kaydon bearings division. Some of the premature failures experienced by slewing ring bearings can be prevented through careful monitoring of symptoms. Largesize and heavyload slewing bearings, which are mainly used in heavy equipment, comprise a subgroup of rolling bearings. How to spot bearing failures, correct them and prevent them from happening again.
Each chapter consists of a logical organization of material, technical diagrams and a short quiz to help you retain what you study. The raceway diameter of the slew bearing rothe erde make is 3965 mm. China slewing ring bearing manufacturers, slewing ring. To determine if a silverthin slewing ring bearing is appropriate for an application, a service factor is applied. While understanding the design and performance capabilities of a slewing ring bearing is important, it is equally important to be aware of how certain mounting surfaces affect this type of bearing. General technical information slewing bearings global bearing. Slewing ring bearing, slewing torque, special bearing rollix. The current product range includes slewing ring bearings which may be single or doublerow fourpoint contact, triple. Staff engineer walker process equipment division of mcnish corporation may 2006 slewing is defined as the rotation of an object about an axis. The term slew means to turn without changing location, so. Slew ring bearing a slewing bearing or slew ing ring is a rotational rollingelement bearing that typically supports a heavy but slowturning or slowoscillating load, often a horizontal platform such as a conventional crane, a swing yarder, or the windfacing platform of a horizontalaxis windmill. Slewing ring bearings are large size rolling bearings that can accommodate axial, radial and moment loads acting either in single or in combination or in any direction. Slew ring bearing, planetary gearboxes, manufacturer. Slew ring bearing, just like the other ball and roller bearings are subject to wear and tear due to the continuous moment of the rolling elements either balls or rollers inside them.
Pdf impact of exploitation conditions on the types of wear of the. Slewing rings are sealed on both sides, lubricated with a high quality grease, can be relubricated via lubrication nipples and are particularly easy to fit. Failure spalled area moderately spalled area indicates fatigue failureusually referred to as spallingis the fracture of the running surfaces and subsequent removal of small. After installing the slewing bearings, we put it on the vertical lathe to check its rotation and noise.
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