IKO bearing selection

Please consider the load conditions, lubrication conditions, temperature, sliding speed, etc. to choose refueling or IKO unlubricated joint bearings. Load Capacity 1 Dynamic Load Capacity The dynamic load capacity Cd is the maximum load that the bearing will tolerate during oscillating motion. The maximum allowable load is basically calculated based on the contact surface pressure of the joint. Dynamic load capacity is used to calculate bearing life. The recommended value of the bearing load with respect to the dynamic load capacity Cd differs depending on the type of the bearing and the load condition, but the values ​​in Table 9 can be regarded as a rough standard for selection. Table 9 Recommended values ​​of the working load Type of the bearing Refuel type Spherical bearing Refueling type Spherical bearing ≤ 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 Equipment Co., Ltd. consultation. The dynamic load capacity Cdt in consideration of bearing temperature can be calculated using the following formula using the temperature coefficient. The

Cdt=ft Cd .......................................... (1) where Cdt: dynamic load capacity considering temperature rise factor N ft : temperature coefficient (see Table 10) Cd: dynamic load capacity N (Refer to the dimension table).
  Static load capacity The static load capacity Cs is the maximum static load of the bearing load under the condition that the inner or outer ring is not damaged or does not cause permanent deformation. When the load load of the bearing is close to the static load capacity, the stress acting on the shaft or the housing reaches a limit, and care must be taken. The equivalent radial load bearing is a bearing capable of bearing both radial and axial loads. If the magnitude and direction of these loads are constant, the equivalent radial load can be calculated by the following formula. The

P=Fr +YFa .......................................... (2) where P: equivalent radial load N Fr: radial load N Fa: axial load N Y: axial load factor (See Table 11).

  The life of the IKO bearing The life of the joint bearing is indicated by the total number of oscillations until the normal operation of the joint bearing due to wear of the sliding contact surface such as increased internal clearance, increased friction torque, and increased bearing temperature. Since the bearing life is affected by various factors such as the material of the sliding contact portion, the load direction, the size, the lubrication condition, and the sliding speed, the calculated value of the life can be used as an empirically practical value. Life of refueling joint bearing [1] Confirmation pV value confirmation is within the permissible range of the pV graph shown in Fig. 1 to determine whether to use the calculation formula of oil-filled joint bearing life. If you use more than this range, please consult Qingdao Ruijing Mechanical and Electrical Equipment Co., Ltd. The contact pressure p and the sliding speed V are calculated according to the following formula. The

p=100P ..........................................(3) Cdt V=5.82×10-4dkβf ..............................(4) Where p: contact pressure N/ Mm2 P: Equivalent radial load N (refer to formula (2)) Cdt: Dynamic load capacity N considering temperature rise factor (refer to formula (1)) V: Sliding speed mm/sdk: Spherical diameter mm (refer to the dimension table 2β: swing angle (refer to Fig. 2) β=5 when β<5° β=90 f when rotating: Number of oscillations min-1 per minute.
  [2] Bearing Life IKO refueling joint bearing life is calculated according to the following formula. G = 3.18b1b2b3 Cdt × 105 .................. (5) dkβ P Lh = G............................................. (6) 60 where G: life (total swing number) B1: Load direction coefficient (refer to Table 12) b2: Lubrication coefficient (Refer to Table 13 b3: Sliding speed coefficient (see Figure 3)) Cdt: Dynamic load capacity N considering temperature rise factor (refer to formula (1)) P : etc. Radial load N (refer to formula (2)) Lh: Life time hf: Number of oscillations min-1 per minute.

  The life of non-oiled joint bearing [1] confirms whether the pV value is within the allowable range of the pV graph shown in Fig. 4 to determine whether to use the formula for the life of the oilless joint bearing. If you use more than this range, please consult Qingdao Ruijing Mechanical and Electrical Equipment Co., Ltd. The contact pressure p and the sliding velocity V are calculated according to equations (3) and (4) on page 447. [2] Bearing Life The life of the unfilled joint bearing is obtained by using the formula (3) to obtain the total sliding distance S at the contact surface pressure p using FIG. 5. Therefore, the total number of oscillations and the life time are calculated by the following formula.

G = 16.67 × b1Sf ..............................(7) VLh = G.................................................. (8) 60f Where G: life (total oscillations B1: Load direction coefficient (refer to Table 14) S: Total slide distance m (refer to Fig. 5) f: Swing frequency min-1 per minute V: Slide speed mm/s Lh: Life time h.