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Selection of joint bearing

by:JNSN     2021-12-29
Please consider load conditions, lubrication conditions, temperature, sliding speed, etc. to choose oil-filled or non-oil-filled joint bearings. Load capacity 1 Dynamic load capacity The dynamic load capacity Cd is the maximum load allowed by the bearing during oscillating motion. The maximum allowable load is basically calculated based on the contact surface pressure of the joint. The dynamic load capacity is used to calculate the life of the bearing. The recommended value of the bearing load relative to the dynamic load capacity Cd varies depending on the bearing model and load conditions, but the values u200bu200bin Table 9 can be used as a rough guide for selection. Table 9   Recommended value of working load Bearing type Oil-filled spherical plain bearings Non-oil-filled spherical plain bearings ≤0.3Cd≤Cd≤0.6Cd≤0.5Cd The load direction must be alternated. If the load condition exceeds the value in Table 9, please contact Qingdao Ruijing Electromechanical Co., Ltd. Equipment Co., Ltd. consulting. The dynamic load capacity Cdt, which takes into account the influence of bearing temperature, can be obtained from the following formula using the temperature coefficient.   Cdt u003d ft Cd (1) where Cdt: dynamic load capacity considering the temperature rise factor   N ft: temperature coefficient (refer to Table 10)   Cd: dynamic load capacity   N (refer to the dimension table). Static load capacity The static load capacity Cs refers to the maximum static load that the bearing can load under the condition that the inner ring or outer ring is not damaged or has no permanent deformation that would make it impossible to move. When the load of the bearing is close to the static load capacity, the stress acting on the shaft or the bearing seat reaches the limit, and care must be taken. Equivalent radial load joint bearing is a bearing that can bear radial load and axial load at the same time. If the magnitude and direction of these loads are constant, the equivalent radial load can be calculated by the following formula.  Pu003dFr +YFa (2)  where  P: equivalent radial load N  Fr: radial load N Fa: axial load N Y: axial load factor (refer to Table 11). Bearing life The life of a joint bearing is expressed in terms of the total number of oscillations until it fails to work normally due to the wear of the sliding contact surface, which increases the internal clearance, increases the friction torque, and increases the temperature of the bearing. Because the bearing life is affected by many factors such as the material of the sliding contact part, the load direction, size, lubrication conditions, and sliding speed, the calculated life can be used as a practical value based on experience. The life of the oil-filled joint bearing [1] Confirm whether the pV value is within the allowable range of the pV curve shown in Figure 1 to determine whether to use the calculation formula for the life of the oil-filled joint bearing. If you use it beyond this range, please consult Qingdao Ruijing Electromechanical Equipment Co., Ltd. The values u200bu200bof contact surface pressure p and sliding velocity V are calculated according to the following formula. pu003d100P      (3)Cdt  Vu003d5.82×10-4dkβf (4)  where p: contact surface pressure N/mm2    P: equivalent radial load N (refer to formula (2))  Cdt: considering the temperature rise factor Dynamic load capacity N (refer to formula (1))   V: sliding speed mm/sdk: ball diameter mm (refer to the size table) 2β: swing angle (refer to Figure 2)   when β<5°, βu003d5, when rotating βu003d90 f : The number of swings per minute min-1. [2] Bearing life The life of oil-filled joint bearings is calculated according to the following formula. Gu003d3.18b1b2b3  Cdt ×105      (5)dkβ  P   Lhu003dG(6)60  where G: life (total number of swings)   b1: load direction factor (refer to Table 3) b2: lubrication coefficient (refer to Table 3) Speed u200bu200bcoefficient (refer to Figure 3) Cdt: Dynamic load capacity N (refer to formula (1)) taking into account the temperature rise factor   P: Equivalent radial load N    (refer to formula (2)) Lh: Life time hf: Oscillation per minute Times min-1. Life of non-lubricated spherical plain bearings [1] Confirm whether the pV value is within the allowable range of the pV curve shown in Figure 4 to determine whether to use the non-lubricated spherical plain bearing life calculation formula. If it exceeds For the use of this range, please consult Qingdao Ruijing Electromechanical Equipment Co., Ltd. Contact surface pressure p and sliding speed V are calculated according to formulas (3) and (4) on page 447. [2] Bearing life of non-lubricated joint bearings The life is calculated by using the formula (3) to obtain the total sliding distance S when the contact surface pressure p is obtained using Figure 5. Therefore, the total number of swings and the life time are calculated according to the following formula.  G u003d 16.67×b1Sf       (7)VLh u003dG( 8)      60f  where G: life (total number of swings)   b1: load direction factor (refer to Table 14)   S: total sliding distance m (refer to Figure 5)   f: number of swings per minute min-1 V: sliding speed mm/s Lh: life time h.
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