Structural Characteristics Of Reducer - Gear, Shaft, And Bearing Combination

Combination of gears, shafts, and bearings
The small gear is integrated with the shaft and is called a gear shaft. This structure is used when the diameter of the gear is not closely related to the diameter of the shaft. If the diameter of the shaft is d and the diameter of the gear tooth root circle is df, then when df-d ≤ 6-7mn, this structure should be used. When df-d>6-7mn, a structure where the gear and shaft are separated into two parts is adopted, such as a low-speed shaft and a large gear. At this point, the gear is connected to the circumferential fixed flat key of the shaft, and the parts on the shaft are axially fixed using the shoulder, sleeve, and bearing cover. Both shafts adopt deep groove ball bearings. This combination is used to withstand radial loads and not
The case of large axial load. When the axial load is large, a combination structure of angular contact ball bearings, tapered roller bearings, or deep groove ball bearings and thrust bearings should be used. Bearings are lubricated by the thin oil splashed up during gear rotation. The lubricating oil from the oil pool in the box seat is splashed off by the rotating gear and splashed onto the inner wall of the box cover. It flows along the inner wall to the groove of the box surface and then flows into the bearing through the oil guide groove. When immersed in oil, the circumferential speed of the gear υ≤ At a speed of 2m/s, lubricating grease should be used to lubricate the bearings. To avoid the possibility of splashing thin oil washing away the lubricating grease, oil retaining rings can be used to separate them. To prevent the loss of lubricating oil and the entry of external dust into the box, a sealing element is installed between the bearing end cover and the extended shaft.