ZKL India BBD Bag, Kolkata, West Bengal

Today’s bearings are facing challenges that their predecessors couldn’t have imagined. New products, increasingly sophisticated, high-speed precision machinery, new technologies, faster processes, more stress, heavier loads, longer hours of operation – It goes on. Characteristics of ZKL Unit Bearings ZKL Unit Bearings are self-aligning in their housings, which compensates for any misalignment of housing or shaft during installation. ZKL Unit Bearings conform to the International Standards in so far as Basic LoadRatings and limiting speeds are concerned. ZKL Units are easily adaptable to simple or complex bearing arrangements, and are designed to facilitate easy mounting and dismounting. ZKL Unit Bearings deliver smooth and efficient performance even in arduous operating environments and conditions. ZKL Unit Bearings are engineered to close tolerances from tough and tested steels and machined to enhance working life. The ZKL Unit Bearing series is available in different configurations and dimension ranges. Variants with extended inner rings and having different method used to locate the bearing on the shaft, are available, e.g., grub (set) screw locking; eccentric locking collar with grub (set) screw; adapter sleeves etc. Unit Bearings for Metric and Inch size shafts are also available. All ZKL Unit Bearings are sealed on both sides with rubbing seals and are supplied ready-greased with lithium-based and non-toxic lubricants which exhibit good anti-rust properties and temperature tolerances of – 30 degree to + 110 degree Celsius. Careful attention has been paid to Accuracy of dimensions of the components and the tolerances thereof, and quality of grease and seals used in these units.

Thrust ball bearings are designed for carrying Axial loads and are of separable construction, the shaft washer (ring), the housing washer(ring) and the cage-ball assembly are to be put together for use on the shaft. They are manufactured in multiple series, and as single-directional or bi-directional. The single-row thrust ball bearings consist of a shaft washer (ring) with an raceway, a cage with balls and a housing washer (ring) with a raceway. These bearings can transmit axial load in one direction only, and must not be exposed to radial load. The bearings are manufactured in normal accuracy. However, bearings with higher running accuracy can also be supplied. Bi-directional thrust ball bearings have two cages with balls placed between the shaft washer (ring) and two housing washers (ring). The central shaft washer (ring) has raceways for roller elements on both sides, and is mounted onto a shaft. The housing washers (ring) have the raceway on one side only. These bearings can transmit axial load in both directions. The bearings must not be exposed to radial load. The bearings are manufactured in normal accuracy. However, bearings with higher running accuracy can also be supplied.

Spherical roller thrust bearings are of separable construction, The shaft washer is assembled with the cage and a number of asymmetrical spherical rollers and has to be used along with a housing washer having sphered raceway. During mounting, the rings are to be fixed on to their respective seats – shaft washer on the shaft and housing washer on to the housing and then they have to be put together carefully They are manufactured in multiple series. The raceway of the housing washer is at an angle with it’s ais of rotation, so as to be able to allow the rollers to remain in touch with it. As a result, a spherical roller thrust bearing is capable of carrying both a radial as well as an axial load. Spherical roller thrust bearings – because of their internal geometry – are capable of accommodating certain amount of misalignment. However, they can take axial loads only from one direction, and may need to be used in pairs in Back-to-Back or Face-to-Face arrangement, if thrust load from both the directions are to be carried. Spherical roller thrust bearings are capable of compensating misalignment and shaft deflection. The bearings are manufactured in normal accuracy. However, bearings with higher running accuracy can also be supplied. CLICK FOR MORE DETAILS

Traditional Plain Bearing users who handle radial loads and suffer the constant tension of major and minor misalignments can now take heart.   The latest hi-tech addition to the wide and growing range of ZKL- Spherical Plain Bearings will handle radial loads and misalignment with smooth and effortless ease…virtually maintenance free.   Advantages:-Maintenance- free ZKL spherical plain bearings boast several advantages over the rolling-element designs. For example, they do not require lubrication because of the special sliding- contact surface. The sliding layer is asymmetrical, and resistant to moisture. An adhesive bond resist separation. The bearings support high dynamic and static loads. The bearings have a low friction factor and can take high contact pressure. Plus there are several variations to the bearing design. Spherical plain bearings are good for supporting radial loads and where bearings must work without maintenance. The design is also recommended where it’s suitable to lubricate a metallic sliding- contact surface, as in unilateral loads. The design can be combined with axial spherical plain bearings to support axial loads also.  

Most machines work in environments where noise – levels are high. It is difficult to identify particular sounds / noise elements associated with rotational fluctuations within that ambient sound. If the machine is running with / without adequate lubrication , normal noise is disturbed and the ‘frictional noise’ can only be distinguished and measured by such sensitive instruments as the ZKL Sound Level Meter which are accurate upto 130dB. This meter is an invaluable aid on the shop – floor helping technicians and other users to measure sound levels , detect any flaws / problems and helping them to take corrective / remedial measures. Who would benefit The ZKL Sound LEVEL Meter is the instrument – of- choice for Safety Engineers , Health , Industrial Safety Offices and Quality Control Departments working in varied environments as IEC 651 Type – II, ANSI S1.4II.

Single-row tapered roller bearings are of separable construction. The inner ring is assembled with a cage and the rollers and has to be used along with the outer ring for operation. The rings are to be mounted separately on to the machine during assembly – – Inner ring on the shaft and outer ring on to the housing and then they have to be put together carefully. They are manufactured in multiple series. They feature high rigidity, reasonably low friction and the ability to transmit high radial and single-direction axial load. The intensity of the axial load transmitted depends on the size of the contact angle. Through paired arrangement of two bearings in Back-to-Back or Face-to-Face, bi-directional axial load-carrying capacity can be achieved. The single-row tapered roller bearings are manufactured both in metric and inch dimensions. The bearings are manufactured with normal accuracy. However, bearings with higher running accuracy can also be supplied.

Single-row deep groove ball bearings are of non-separable construction. They are manufactured in multiple series and executions e.g., open, with single shield or Seal and double shield or Seal. These bearings are capable of silent running with low friction and are suitable even for high rpm. The rpm of Sealed bearings is limited in comparison with the open type. The single-row deep groove ball bearings can transmit radial and axial forces in both directions at relatively high rpm thanks to relatively deep grooves and high degree of alignment between the rolling elements and the raceways. Only low misalignment of bearing rings is allowed for single-row deep groove ball bearings. The bearings are supplied with standard radial clearance and running accuracy . However, bearings with lower or higher radial clearance as well as higher running accuracy can also be supplied.

Single-row cylindrical roller bearings are of separable construction. The ring with flanges is assembled with the cage and the rollers. During mounting, the rings are to be fixed on to their respective seats – Inner ring on the shaft and outer ring on to the housing and then they have to be put together carefully. Depending on the ring-roller-cage configuration either on the inner ring or the outer ring, the bearing series are designated as NU and N. Series NJ and NUP are variants of the NU design – denoting whether the separable inner ring has one flange (NJ) or one flange and truncated inner ring with a separable guide flange fixed on the other side of the flange so as to keep the width of the inner ring assembly same as that of the outer ring (NUP). They are manufactured in multiple series. The bearings feature high rigidity, low friction, an ability to transmit high radial loads and are suitable for high rpm. N or NU series bearings should not be exposed to axial loads. Nj series bearings can carry limited axial load in only one direction, whereas NUP series series of bearings can carry limited axial loads in both the directions. The bearings are supplied with standard clearance and normal accuracy. However, bearings with lower or higher radial clearances as well as higher running accuracy can also be supplied. The bearings in the N design – the inner ring has two pilot flanges, the outer ring is without the pilot flanges. Axial displacement of the shaft towards the element (body) is possible in both directions.

Rotary shaft tip seals are components designed in a ring form , fitted between machine parts in relative rotation, with the function of separating oil or grease from the inside and dirt , dust, water etc. from the outside. The rotary shaft seals are generally composed of an elastomeric diaphragm , shaped in a “lip form” and reinforced with a Co-Vulcanized metal insert .The Sealing lip is energized with a “Garter Spring”. Seal Design The sealing lip design corresponds to the current state of art and is based on many years of experience in a wide range of a application fields. The sealing edge can either be ready be ready molded or trimmed by mechanical cutting. The total radial force of the sealing lip is given by elastomer pre-tension together with tensile spring force. The Former depends on the deformation and elasticity of the rubber material, geometry of the sealing lip and interference between shaft and seal.

ZKL– Committed to Trouble – free Handling & Maintenance of Bearings ZKL has always exhibited its care and concern for customers by developing a range of value-added products, accessories/tools and instruments that ensure higher efficiency and longer life for its bearings. One of such developments has been the use of Oil Injection methods for Mounting and dismounting of bearings, especially large – sized ones. How Oil Injection Works Oil is injected under pressure (by a reciprocating hand pump)between the shaft and the inner ring of a bearing. The oil exerts pressure and expands the inner ring at the same time forming a lubricating film. This helps bearings, couplings , fans etc , to slide out easily resulting in scratch – free dismounting.

The basic Purpose of bearing housing is to absorb bearing load and provide dust free environment with lubrication retaining facility and hold bearing stationary outer ring. However to improve the bearing life & it’s reliability, the housing need to have following quality features. To have bore with perfect roundness. No blow holes in the casting. Perfect centre height from base. Provide adequate room for lubricant. Provide effective sealing to avoid ingress of dirt, water & moisture. Proper sealing arrangement to prevent lubricant leakage. The ZKL Bearing housings range has been developed to accommodate all industrial requirements, operating parameters and suit various industrial locations. To fulfill all industrial conditions , housing are developed in different sizes , shapes and material. According to this , housings are designated for easy customer understanding and selections. Most of the ZKL Bearing housings are horizontally splited , suitable for bearings having Tapered bore or Cylindrical Bore. These housing are made from high grade cast iron or cast steel. The cast steel housings are generally selected for heavy loads and / or shock loads applications.  

Just as in human beings , temperature is a key indicator of machine health , particularly rotating machinery. It indicates running health , state – of – lubrication , rotational alignments an a multitude of other factors in a rotating machine , therefore it is critical to keep a check on temperatures. Regular monitoring of temperature determines lubrication timings , help shut – down planning. Overhaul scheduling and even bearing replacement requirements.

Production and efficiency often depends on the ability to measure the rotating speed in industrial equipments. The ZKL Digital Optical Tachometer accurately measures peed over a range of 5 to virtually infinite RPM and is therefore an invaluable instrument on the shop – floor of any industrial establishment. The tachometer comes in a handy carrying – case for easy application and carriage from one machine point to another. Enhanced Application Benefits Hard – to –reach – and – measure areas of operation , especially in hazardous zones or inaccessible heights Measuring molten metal temperatures (in steel industry for example) Measuring Kiln temperatures Measuring bearing temperature of all rotating machinery across industries Measuring temperatures in air – conditioning , chemical and in - process industries

Using ZKL’s Induction Heater , you can install bearings with high precision into shafts without any risk of damage. Heating of the bearing prior to installation to a particular temperature is necessary in order to retain the micro structure essential for getting the maximum efficiency from the bearing, without which bearings are at risk of damage. ZKL ensures that you don’t face this problem with the specially designed Induction Heater. Digital read – out panel Automatic de-magnetization 80 % savings in power Induction Coil and electronics protected from thermal overheating Contemporary, Sleek , compact and rugged design Light weight for easy carriage of operation Standard Yoke sizes Auto timer Auto temperature alert

ZHP, ZKL Hydraulic Puller is designed for effortless , efficient and error-free dismounting of bearings , bushings , wheel , gears , pulleys and similar shaft mounted components. The ZHP Range comes in 6, 10, 15, 20, 30 & 50 Tons capacity and are equipped with 3 (three) arms for uniform pulling action. Remove Handle & 360 degree Rotary Pump Handle Self – contained Hydraulic Pump & Puller Extention Piece Integral Safety Valve Easy Release Valve Fast – adjusting Nut Heat Treated Alloy Steel Cross Bolts Heat Treated , Chrome Plated Hydraulic Cylinder Rod Spring – loaded Live – centering Nut(removable)

Paper processing has undergone a sea – change. New technologies , new process , higher speeds, superior quality are the order of the day. Paper mills today are high performers and their equipment, especially bearings need to perform better, longer and more reliably in an environment friendly manner than ever before. ZKL Greases are specially formulated new generation lubricants that not only reduce friction , wear and tear , but can operate at higher speeds, higher operating temperatures and high load conditions. ZKL Greases are made with special additives such as molybdenum, lithium, calcium and aluminium complexes. ZKL Greases remain mechanically stable and do not harden or thicken quickly , have excellent resistance to water , which helps extend the operating life of both the grease and the bearing. ZKL recommends use of non Toxic PFG greases for paper mills. For your paper mills requirement pf ZKL Greases – contact your nearest ZKL office or ZKL Authorized Distributor immediately.

Double row spherical roller bearings are of non-separable construction. They are manufactured in multiple series. Double-row spherical-roller bearings are manufactured either with cylindrical or tapered bore, the taper ratio of which is normally 1:12. However, for series 240 and 241, the taper is 1:30. The bearings having a cylindrical bore are fitted straight onto a cylindrical shaft, whereas a bearing having tapered bore is to be mounted either on a shaft having same taper as in the bore of the bearing, or on a straight shaft by means of an adapter sleeve or a withdrawal sleeve, inserted between the shaft and the bearing. Double row spherical roller bearings have two rows of spherical rollers with a common spherical track on the outer ring bore. This allows swivelling of the bearing inner ring with respect to the outer ring around the centre of the bearing, without affecting its correct function. Thus, these bearings are capable of compensating misalignment, shaft deflection and even machining error in the machine components to a certain extent. These bearings can transmit high radial and axial loads in either direction simultaneously. Double row spherical roller bearings have high load carrying ability. The bearings are supplied with standard radial clearance. However, bearings for special applications can be supplied either with lower or higher radial clearance. The bearings are manufactured in normal accuracy class, However, bearings with higher running accuracy can also be supplied.  

Double-row self-aligning ball bearings are non-separable. They are made in multiple series and with open construction. They are capable of running with low friction and at higher rpm. The double-row self-aligning ball bearings are manufactured with cylindrical or tapered bore, the taper ratio being 1:12. The bearings with tapered bore are required to be fitted either onto a shaft with tapered seating on the shaft, or by means of an adapter sleeve onto a cylindrical shaft. These bearings can transmit radial and limited axial forces. The double-row self-aligning ball bearings have two rows of balls with a common spherical track on the outer ring. This allows misalignment of the bearing inner ring with respect to the outer ring around the centre of the bearing, without affecting its correct function. These bearings are capable of compensating lack of co-axiality between the shaft and the housing, shaft deflection and even machining defect in the support structure that may give rise to the misalignment after assembly. The bearings are supplied with standard clearance and with normal accuracy class. Bearings with lower or higher radial clearance as well as higher accuracy can also be supplied.  

ZKL bearing are used extensively in heavy engineering and mining industries and in many other industrial segments as wel as in agricultural equipment. The heavy engineering segment especially utilizes special bearings which are currently paid special attention in our company. These are cross-split roller bearings, the construction and manufacture technology of which are in ZKL tested on special roller bearings up to the 900 mm outer diameter and on spherical roller bearings up to the 1 600 mm outer diameter. The portfolio of these bearings is constantly extended and puts ZKL among the prominent world manufacturers. The cross-split bearings are suitable for applications mainly in those conditions where axial mounting of the bearing into the seating is unfeasible, which is for instance multiply seated shafts, crankshafts or long transmissions, or in such cases when mounting of the bearings into the seating would be too long, and the resulting shutdown of the device would cause severe operation faults. Most frequently used cross-split bearings in the world are the single-row roller and double-row spherical roller bearings. Both the above mentioned design groups are included in the ZKL’s production programme. The said bearings have a radial-split outer ring, inner ring and also the cage for conducting the roller elements. The cages are usually massive, brass. Both halves of the cage are coupled to be able to resist dynamic forces, which the cage is exposed to during the operation. Both halves of the inner ring are placed on the shaft with the help of belting rings, equipped with a threaded joint, provided with an arresting mechanism. The splitting joint between the halves of the outer ring can be perpendicular to the front of the ring. On the other hand, the plane of separation of the inner ring is designed as inclined at an angle, so that no impacts occur during rolling of the roller elements in the loaded zone on the edge of the plane of separation. CLICK FOR MORE DETAILS

This tool has been developed for common sizes of bearings with nominal span width varying from 65 to 300mm. Made from graded quality steel , specially hardened , this tool can deplay powerful pulling force during application. Leg opening and closing are easily and quickly adjustable by tightening / loosening the cone . Flat springs provide additional support to legs when holding the bearings. These ZKL Pullers come in several convenient sizes – the smallest consisting of two – legs and the heavier models features three – legs which help distribute the pulling force equally and ensure accurate centering. Quality Features All ZMMP Pullers guarantee the following advantages: Quality steel construction Through hardening Anti – rust properties Firm grip and leg support Longer life Higher load – bearing capacity Additional usage – allows this tool to be used to removing bearings from shafts by applying pulling force on the outer ring of the bearings.

ZKL ZMFT – 33 plus The ZKL ZMFT – 33 is a perfect solution provider . It’s the ultimate in easy and dent – free mounting of bearings up to 50mm bore on shafts as well as housing , uniformly , without alignment problems. Impact ring face ensures even and simultaneous contact with inner and outer ring of bearings , preventing any mounting force from being transmitted through rolling elements and protecting bearing race ways from any damage. Extended Usage The ZKL ZMFT – 33 Tool Kit can also be used to mount bushings , seal rings , belt pulleys and sleeves for assembly purposes.

Lock - nuts are sometimes referred as shaft or withdrawal nuts depending on the use on which they are to be put in. They provide a simple means of axially locating bearings and other machine components on the shafts and also facilitate mounting and dismounting small bearing on withdrawal sleeves. The required bearing internal clearness on tapered sleeves is achieved by carefully tightening of lock nut. For tapered roller bearing, the positive clearance is achieved by full tightening of lock nut and releasing by ¼ pitch. The lock nuts are designated as ‘KM XX’ and for withdrawal nut it is ‘HM XX’

ZKL Lock – washers are used to lock the nuts on the shaft , while inner tab is used for locking for the larger size of nuts. Lock- washers are designated as ‘MB XX’ . Locking washers are made out of deep drawing , cold rolled , annealed steel (CRCA) . After tightening of Lock nut , the lock washer teeth is pressed into one of four grooves of lock nut to make the assembly tightly fitted.