Slewing Bearing – Part 01

Slewing Bearing, also known as slewing ring bearing, turntable bearing, slewing ring, etc, is widely used in modern industries. Types of Slewing Bearing Single-row ball type (01 series, HS series, Q series)Double-row ball type (02 series)Three-row roller type (13 series)Single-row cross roller type (11 series)Double-row ball type (07 series) )Light and non-standard specifications series slewing bearing Manufacturing Processing Raw material inspection Chemical composition analysis Heat treatment Raceway hardness inspection Gearing processing Gear inspection CNC drilling processing Mounting hole inspection Turning processing Raceway inspection Assembly Finished product inspection Qualified stock In the entire cycle of slewing bearings from forgings to finished products to the hands of customers, the tooth processing technology takes the longest time, and the length of the delivery period depends greatly on the timeliness of the slewing gear processing. Hobbing machining accounts for about 45% of the entire slewing bearing processing volume, or even a larger proportion. For large diameter and large modulus slewing bearing machining, milling gear machining also reflects the characteristics of good machining accuracy, high efficiency, and convenient programming. In recent years, in order to adapt to the improvement of machining precision and production efficiency requirements of slewing bearing processing, the hobbing technology has continuously…

Upgrading TYN Cages

The majority of angular contact bearings use phenolic type cages and these are exceptional good for a wide range of conditions and particularly for high-speed since they are outer ring located. However, there are advantages to using TYN cages in certain applications, particularly in grease lubrication. TYN is a polyamide material and this cage is designed to be ball guided. Reduced Cage Noise In certain applications cage noise can occur in grease lubricated bearings. This is due to friction between the ballsurface and the cage guide surface; this can be particularly noticed in cold conditions. The TYN cage design eliminates this due to the very low friction quality of the material and good vibration absorption characteristics as well as improvements in the cage shape. The test data up shows the comparison of the Phenolic and Polyamide cage: Longer Grease Life-Shorter ‘Running In’ Time Grease life is longer because there is more internal space for the grease to collect in and because the grease can clear the rotating parts more quickly, the running in time is reduced Cage Guiding Contact: More grease space with TYN. Less grease pushed out of bearing, therefore, longer life. Shorter running in time compared to Phenolic…

Bearing Suffix Conclusion

/..: Standardized rolling bearings with uncoded inner diameters A: Single row angular contact ball bearing with 30° contact angle AC: Single row angular contact ball bearing with 25° contact angle ACD: Single row angular contact ball bearing, optimised internal design, 25° contact angle ADA: Double row full complement cylindrical roller bearing with wide snap ring grooves in outer ring, two inner ring halves held together by U-shaped retaining ring AS: Needle roller bearing with lubrication hole(s) in outer ring. A figure following the AS indicates the number of holes ASR: Needle roller bearing with annular groove and lubrication hole(s) in outer ring. A figure following the ASR indicates the number of holes Axx(x): A combined with a two or three-figure number identifies variants of the standard design, which cannot be identified by generally applicable suffixes B: Deviating or modified internal design with same boundary dimensions. As a rule the significance of the letter is bound to the particular bearing or bearing series Examples: 7210 B Single row angular contact ball bearing with 40° contact angle 32210 B Taper roller bearing with steep contact angle (steeper than 32210) BE: Single row angular contact ball bearing with 40° contact angle and optimised…

PWM Frequency Modulation Motor Bearing

With the wide application of PWM and IGBT in motor, the problems caused by electromagnetic damage such as electric corrosion of bearing are more and more prominent. What causes electromagnetic damage of bearing? Common mode voltage is the main cause electromagnetic damage. When the bearing is running at high speed, there will be a fluid oil with strong insulation between the roller and the inner & outer raceways. Due to the constant change of common mode voltage, fluid film is charging and discharging, leading to currents. It has a continuous thermal effect on the lubricant, which will cause deterioration, deficiency, carbonization of lubricant, thus affecting the life of bearing. Under the deficiency of lubricant, the shaft current directly passes through the bearing and discharges on the contact surface of the bearing, which will cause teeth electric erosion along the rolling direction. When the common mode voltage on both sides of the fluid film is too large, the fluid film will be broken down, resulting in EMD currents. It will cause electrical erosion pits on the raceway, which usually need to be observed under the microscope. And the raceway appears dim and tarnished. Solution In PWM Frequency Modulation Motor, EMD current…

Our current price is 50% lower than yours…

After offering we heard many times voice of “Your price is too high” or “Our current price is 50% lower than yours ” …You have explained to customer that how good quality your product is, showed your testing reports with thousands times, because you know clearly the difference between products of different price level. How do you prove it? Yes, taken inspection for these different products is a good method . TBB did so.However, the testing of basic data such as size, clearance, precision, vibrate. Sometimes there have very big different on measurement, but sometimes there do not have very obvious different on data. What is the deep reason for big price gap? To end the confusion, TBB did further testing- Life Reliability Comparison Test at National Bearing Testing & Inspection Institute.A group of 4 piece of deep groove ball bearings, after rigorous and reasonable experimental process: Firstly, can you guess how the bearings performed ? Here comes some pictures to show how it performance. Secondly, can you guess how many hours the bearings lasting? Here comes the testing results. #1 bearing from TBB OEM product, it lasting for 121.5 hours till the testing ended with good condition.#2 bearing from world well-known second-class…

Bearings with black oxide finish – Increased performance in critical applications

At this year’s Hannover Messe in Germany, bearing manufacturer NKE Austria GmbH presents bearings with black oxide finish. The protective layer improves run-in and wear characteristics and protects against environmental effects. Especially in critical applications such as wind turbine gear boxes, black oxide finish is a cost-effective and technically viable means of prolonging the service life and performance of rolling bearings. The black oxide finish forms a protective layer for steel parts. In a multistage chemical process, the surface layer of the treated parts is converted into a 1 to 2 micrometer thin mixed ferrous oxide layer that causes the characteristic black appearance. Black oxide finished bearing components feature a set of special technical characteristics, especially in the case of components that move relative to each other. Multiple protective effects can be achieved if only one functional element (typically the rolling elements) is treated. For best effect, however, all functional surfaces of a rolling element bearing, including the inner and outer ring as well as the rolling elements, should be black oxide finished. Black oxide finishing is already an established method in other industries. NKE uses this technology to further improve the technical properties of rolling bearings. The method has…

Drawn Cup Needle Roller Bearings

TBB drawn cup needle roller bearings is formed with thin steel plate through precision punching with very sectional height and big load capacity. This kind of bearings are especially applicable to the big quantity production with economic demands. Stable combination is used between the needle bearings and the bearing cage. No axle fixture is required. Even under high speed and heavy load condition, the bearing functions can be fully maintained. Furthermore, no lubricating for a long time is possible due to its high storage volume of grease. Structure Types Mounting The outer ring of the drawn cup needle roller bearings made of thin steel plate through punching will reach the correct shape and dimension precision when it is pressed into the bearing cage. Therefore, the dimensional precision and the shaped of bearing cage will directly effect the inscribed circle of the bearing. Thus enough attention must be attached to the size and shape of the bearing cage. In mounting this kind of bearings, it will be easier to use the pressing core shaft as illustrated in the figure. Special tool must be used to press on the side with printed code mark to compress get the bearings fitted when assemblying….

How to Pick the Right SPINDLE BEARING for your Application?

Material Cronidur30ISO Standard: DIN 1.4108Chemical formula: X30CrMoN15-1Advantages: Finer structure, less heat generated, higher permissible contact pressure, much higher fatigue life reliability (10x compared with GCr15 in best case), better corrosion resistance and high temperature resistance Material Ceramic Si3N4Advantages: Excellent tribological properties, lower density to improve the bearing kinematics, lower coefficient of thermal expansion, no magnetism, high current insulation

How Does Raceway and Roller Crowning Affect Bearing Performance?

A GROWING NUMBER OF “BARGAIN” BEARINGS are being brought into the Heavy Duty Truck and Trailer marketplace by bearing brokers whose primary emphasis is on price. They ignore the critical issues of product integrity, performance, and supplier support. Initially the price has some attraction, but testing performed by Hyatt and other major suppliers has proven that a much superior performance is achieved from a quality product provided by a reputable manufacturer. For tapered roller bearings to achieve their Maximum Life in application (L10 Life), the load must be evenly distributed over the length of the rollers. To ensure proper distribution of bearing loads, Hyatt Tapered Roller Bearings are manufactured with a crown on the raceways and rollers. In our experience, the “bargain” products rarely have raceways and rollers that are crowned. Frequently the components have concave contact areas, generating even higher stresses within the bearing and promoting early catastrophic failure. Bearing brokers will state that their products conform to American Bearing Manufacturers Association (ABMA) specifications. These standards, however, only relate to the external dimensions of the bearing and its compatibility with the wheel hub and spindle. If you want a quality product which is going to provide years of uninterrupted service, then…

Wheel Hub Assembly – Time for replacement?

Wheel hub problems are often discovered while ruling out other sources for the squealing and grinding sounds coming from that area of the vehicle or the gradually increasing vibration noticed by the driver. Because such symptoms – odd noises, vibration, deterioration in handling, etc. – The common to a variety of suspension and steering system parts, it is often through the process of elimination that the need to replace this part is apparent. the it is determined for sure that this is the source of the vehicle’s problems, however, the repair Should be made as soon as possible in order to avoid causing damage to other parts or a dangerous road situation. Those that are fairly skilled at performing automotive repair projects at home are likely to find the replacement of the hub and related parts more time consuming than Challenge. Any repair is more likely to last longer when made with quality parts,Timken, Pronto, Quality-Built, WJB, Replacement, Centric, Moog, Dorman, Genuine, Beck Arnley, First Equipment Quality, DuraGo, API, NSK and Febi. (MAPC Bearings OEM for most of these brands) Wheel Hub Assembly – Time for replacement? Wheel Hub AssemblyA hub assembly, also known as a wheel hub assembly or…