Necessary life time and grease life of FYH bearings

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).