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Working conditions and suffix meanings of spherical roller bearings for vibrating machinery

by:JNSN     2021-12-27
Operating conditions of spherical roller bearings for vibrating machinery in vibrating machinery. Vibrating screens used to screen materials (separate solid materials according to particle size) and other vibrating machinery such as road rollers and band saws are all equipment subject to high stress. The rolling bearings installed in the vibration exciter units of these equipment must be able to withstand heavy loads, high speeds, accelerations and centrifugal forces. The working environment of these applications is mostly very harsh, such as pollution and humidity. The special spherical roller bearings are developed for vibrating mechanical conditions and have achieved great success in practical applications. It needs to be pointed out that the cage of the rolling bearing must be able to withstand the forces generated by high radial acceleration. In more severe working conditions, it may also be subjected to the force generated by the axial acceleration. The rotation of the eccentric block will cause the deflection of the rotating shaft and the relative sliding inside the bearing. This will increase friction, leading to higher bearing operating temperatures. The dynamic alignment capability of special spherical roller bearings can reach 0.15°. If you need to provide greater alignment capabilities, please contact Schaeffler Group's industrial application engineers. The basic design of special spherical roller bearings The special spherical roller bearing series for vibration machinery is 223, and its main dimensions comply with E DIN 616: 1995-01 and ISO 15 standards. For the special stress generated in the vibrating machine, special spherical roller bearings with the suffix T41A or T41D are provided. For the description, see section 1.5. By maximizing the use of the bearing cross section, the X-life spherical roller bearing 223-E1 series has a very high load carrying capacity. For vibrating machinery, the currently available X-life series spherical roller bearings have an inner diameter of up to 220 mm. 1.2.1 X-life 223..-E1-T41A(D) series spherical roller bearings E1 designed spherical roller bearings have no ribs on the inner ring and have a very high load carrying capacity. The special bearing 223..-E1 series with suffix T41A or T41D designed for vibrating machinery also has this advantage, see Figure 1. This is a new standard design, suitable for bearings with a bore diameter from 40 mm to 150 mm (bore diameter series 08 to 30). X-life's 223..-E1-T41A (D) series bearings are very successful in a large number of practical applications. The bearing adopts a two-piece window-shaped steel cage, which is supported on the outer ring by an integral guide ring. All cage components have undergone special surface hardening treatment. Spherical Roller Bearings for Vibration Machinery Operating Conditions Special Spherical Roller Bearings Basic Design 21: X-life Design 223..-E1-T41A(D) and 223..-E1-JPAT41A for Vibration Machinery Roller bearings 1.2.2 X-life 223..-E1-JPA- T41A series spherical roller bearings with an inner diameter of 160 mm220 mm (aperture series 32 to 44) have adopted the design shown in Figure 1. These The bearings also meet the X-life performance standards (see 1.2.1). In larger size bearings, the suffix JPA of the stamped steel cage will be marked. Bearings with tapered bores, such as band saws, can also be used with bearings with tapered bores (taper 1:12). The ordering model is as follows: 223..-E1-K-T41A and 223..-E1-K-JPA-T41A (160mm inner diameter is required). Bearings with coated inner holes are designed to reduce or prevent the gap between the inner hole of the bearing and the shaft. Friction corrosion, special spherical roller bearings with cylindrical bore and Durotect® CK coating are available. This coating ensures that after a long period of operation, the bearing can still float between the hole and the shaft (non-positioning bearing) to adapt to temperature changes. The dimensions and tolerances of the bearings with inner bore coating are the same as those of the standard bearings used in vibrating machinery and can be replaced with each other. For 22317-E1-T41D to 22330-E1-T41D, Durotect® CK coating is standard. For more information, please refer to our published PPD (Special Spherical Roller Bearing with Durotect® CK Coating in the Inner Hole). For bearings whose inner diameter is outside the above range, if Durotect® CK coating is required, the suffix J24BA must be specified. Order example: The inner bore of the bearing is coated with Durotect® CK, and the size is within the standard range: 22320-E1-T41D. Order example: The inner bore of the bearing is coated with Durotect® CK, and the size exceeds the standard range: 22316-E1-J24BA-T41A. 1.5 The suffix T41A (T41D) indicates that the spherical roller bearings for vibration machinery are manufactured according to the standard T41A (D), and the special requirements of the application conditions are fully considered, and special requirements are made for the tolerance and radial clearance of the inner ring and outer ring. The other tolerance class is PN, which conforms to DIN 620 standard. Nominal outer diameter inner ring 1.5.1 Bearing inner diameter and outer diameter tolerance T41A(D) The limited inner diameter tolerance is the upper half of the normal tolerance zone. For the outer diameter tolerance, it is limited to the middle half of the normal tolerance zone. For tapered bore bearings, the reduced tolerance zone range only applies to the outer diameter. The tolerance value is shown in Figure 2. Through these measures, when the shaft tolerance is g6 or f6, the inner ring realizes a reliable clearance fit, and when the bearing seat tolerance is P6, the outer ring realizes a reliable interference fit. When the inner ring is coated, the recommended shaft tolerance is f6. The inner ring mainly bears point loads, and the outer ring bears circumferential loads. For the geometric tolerances of the bearing mating surfaces, see page 4.
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