T-Blog, Your Bearing Wikipedia

Its construction is simple and cost-effective. The N/O linear guideway assumes the task of being the lateral linear guideway for the table. As the surface guideway is adjusted level with the N/O, the linear guideway systems can be interchanged – depending on whether the grinding  spindle is mounted to the right or left.

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…

No one knows who invented the planetary gearbox, but it has been in use since the 15th century.Planetary Gearboxes is an old mechanics fundamental that is still being used for new eading innovative technology like 3D printing, and new methods of transport. Planetary gearbox consist of an internal toothed ring gear to which are set 3 planets mounted on the planet carrier engaging also with the sun gear and reduced output speed is taken through planet carrier and ring gear is remain stationary.Output shaft maintaining the same direction of rotation as Input. How bearing behavior in a planetary gear : Salient Features of Planetary Gearbox: High reduction ratios, high-efficiency long Life, space-saving compactness, higher overload capacity, reliable service, greater stability, compact and co-Axial sturdy,no-self locking property,load distribution among planetary gears. Needle roller bearing is used in the planetary gear mechanism used in the advance/retraction switching mechanism of the CVT.While a large centrifugal force is generated in the planetary gear during high-speed operation an extended service life and a small torque are realized through adoption of the special heat treatment shaft and cage and rollers of a strong retainer. TBB Needle roller bearing have the features of low cross section and…

/..: 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…

Key Factors of Electric Motor Bearing Design –Outline dimensions–Load size and direction–Speed requirements, constant/variable/high–Material of motor shaft and housing–Power take-off transmission form–Motor installation form–Vibration level requirements–Noise level requirements–Temperature requirements–Bearing life–Lubrication form–Maintenance–Condition monitoring–Sealing and protection Common Configuration of Electric Motor Bearing –Horizontal Motor 1. DGBB+DGBBCross positioning configuration, suitable for small and medium-sized motors, low maintenance requirements, axial guidance is not a key parameter, non positioning bearings have spring preloading2. Sealed DGBB + CRBSuitable for large motors, with heavy load on the drive side and axial expansion inside the bearing3. CRB + A pair of Angular Contact Ball Bearing Face to FaceFor motors with bidirectional axial load and heavy radial load, or for occasions with strict requirements on axial displacement4. DGBB + A pair of Angular Contact Ball Bearing Face to FaceIt is used for small motors with axial load and moderate radial load, or for occasions with strict requirements on axial movement. Deep groove ball bearing is with spring preload5. CRB + CRB & DGBBFor large motors. The deep groove ball bearing is free in radial direction, and the O-ring is used to prevent the outer ring from rotating6. SRB + SRBFor extra large motors and heavy load occasion –Vertical Motor 1. DGBB + DGBBFor small and medium-sized…

Design Variants To allow the bearings to accept the maximum number of balls, four point contact ball bearings are designed with split inner ring or with split outer ring so these bearings have two basic types, one is featured two half inner ring(QJ series), the other is featured two half outer ring(QJF series). TBB four point contact ball bearings have the contact angle of 35°. We can both provide QJ series and QJF series on request. TBB four point contact ball bearings with outer ring diameters of more than φ160mm are produced with two locating slots in their outer ring (suffix N2), we can also provide small size of outer diameter within φ160mm with locating slots. Tolerance TBB four-point contact ball bearings are produced to the normal tolerance class (PN or P0) as standard. Other tolerance classes such as P6 or P5 are available on request.  ​Cages TBB four-point contact ball bearings are fitted with outer ring centred solid brass cage (suffix MPA or MA, MPA-Solid window cage, guidance by the outer ring, it is the most common type; MA-Solid brass cage, guidance by the outer ring) as standard, please refer to the picture left. Internal Clearance TBB four-point contact…

Size from 2mm to 6m Bearings vary in sizes. The smallest “miniature bearing” in the world is with ID 0.6mm× OD 2.0mm× Thickness 0.8mm, which is used in micro motor. The large-size bearing, with an outer diameter of 6m and a weight of more than 15 tons, is used in the large shield machine for tunneling. This kind of large bearing is used when excavating the cross sea tunnel under the Dover strait connecting Britain and France.  400,000 rpm The dental drill used by dentists (commonly known as dental mobile phones) is equipped with bearings that can rotate at ultra-high speed. It uses two ultra precision bearings with inner diameter of 3.0mm × outer diameter of 6.0mm × width of 2mm and steel ball diameter is of 1.0mm. They can rotate at an amazing speed of 400,000 rpm, which greatly reduces the vibration of dental mobile phones, thus greatly reducing the pain of patients during treatment.  Ball Speed 160 m/s The main shaft bearing of jet engine V2500 of international airliner has a rolling speed of 160 m/s, equivalent to 580 k/h. It is because of using this high-performance high-speed bearings that the engine can run safely for a long…

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…

What is the preload of crossed roller bearings? Generally, rolling bearings have a certain clearance under working conditions. However, in order to achieve a specific purpose, when the cross roller bearing is assembled, apply a certain internal load through adjustment of the clearance to achieve negative clearance. This method is called preload. What are the benefits of preload of crossed roller bearings? 1.Improve the Rotation Accuracy After the bearing is pre-loaded, the internal clearance is eliminated, and each rolling element is subjected to a certain preload, so that the cross roller ring is supported from all directions. Therefore the running accuracy is improved, and the shaft will be positioned correctly in the axial and radial directions. 2. Increase Stiffness The contract between the rolling element and the raceway is elastic contact. The rolling element can be regarded as a spring. Bearings with clearance are supported by only a few springs in the direction of force. But the pre-loaded cross roller bearings are spring-loaded in all directions and have a certain amount of preload. The number of rolling elements under load is greater than that when there is a clearance, so the stiffness can be improved. 3.Extend Bearings Service Life After…