Necessary life time of FYH bearing 4.3 Grease life table 4.3 Necessary life time of rolling bearing with seat (reference) Conditions of use Continuous long-term operation of factory motors, general gear devices, etc. 12,000 to 20,000 per day for more than 8 hours, or continuous long-term operation of 20,000 to 30,000, 24 hours of continuous operation, failures are not allowed Power plant equipment, mine drainage equipment, etc. . 100 000～200 000 In the above formula, L: grease life, hdm: ball group pitch circle diameter, mmn: bearing speed, min-1PrCr: basic dynamic load rating of bearing, NT log Lu003d6.10-4.4010-6dmn-2.50 -0.05 PrCr- (0.021-1.80 10 8dmn) T (D + d) dm u003d 2 (D: bearing nominal outer diameter, d: bearing nominal inner diameter) The application conditions of formula (4.7) are as follows. 1) The working temperature of the bearing: T ℃ applies to T≤100 (but when T<50, take Tu003d50). When T>100, please contact FYH. 2) Bearing speed: dmn applies to dmn≤30104 but when dmn < 12.5, 104 takes dmnu003d12.5104dmn>30104, please contact FYH. 3) Bearing load conditions: For Pr Cr Pr Cr Pr Cr Pr Cr＞0.2, please contact FYH. When < 0.05, taking u003d 0.05 will prolong the life of the FYH rolling bearing with a seat unhelpfully, and it must also be uneconomical. The necessary life of a rolling bearing with a house is set according to the type and operating conditions of the machine using the rolling bearing with a house. Table 4.3 shows the necessary lifespan of rolling bearings with houses used empirically. The grease life of a ball bearing for rolling bearing housings is affected by the magnitude of the load, the rotational speed of the bearing and the operating temperature. The grease life of a component ball bearing when used under normal operating conditions can be estimated by the following formula. (1) Bearing load condition Pr/Cr u003d 0.05 2) Bearing load condition u003d 0.125 Pr rotation speed dmn value (104) (2) Bearing load condition u003d 0.2 PrCr Cr rotation speed dmn value (10/4) Lubrication The relationship between grease life and bearing operating temperature, speed and load conditions (reference).