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General closed gear reducer drive, the lubrication method according to the size of the circumferential speed of the gear. When the peripheral speed of the gear is V<12m/s, the gear teeth of the large gear are often immersed in the oil to lubricate. The depth of the gear immersed in the oil can be determined by the peripheral speed of the gear. The spur gear is usually not more than one tooth height, but it should not be less than 10mm in general; the bevel gear should be immersed in the full tooth width, and should at least be immersed in the tooth width. half. The amount of oil in the sump depends on the amount of power transmitted by the gears. For a single-stage transmission, the power required for each Ikw delivered is approximately 0.35~0.7Lo. For multi-stage transmissions, the required fuel quantity is multiplied by the number of stages.