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Analysis of Bearings in Traction Motor Armature in Imported Bearings

Source: China Bearing Network Time: 2018-01-19

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The traction motor is the primary equipment in the transmission system of electric locomotives and electric drive diesel locomotives; the armature bearing is one of its primary components. The armature bearing load is large; and the size of the traction motor is affected by the wheel diameter and the inner side of the two wheels. Constraints with the lower limit of the locomotive; therefore, it is necessary to have such a small size and a high limit speed for such bearings.
1. The bearing armature of single-side transmission usually adopts double fulcrum support; the output end of the gear is the swimming support; the commutator end is the positioning support. The bearing of the output end is close to the gear; the force is the largest; it is the key in the two bearings of the armature. Bearings. In order to reduce the load; cylindrical roller bearings with inner ring without ribs are usually used. Type NU. The commutator ends are usually cylindrical roller bearings with inner ring and ribs with flat retaining ring. NUP type is also used abroad. Cylindrical roller bearings with single ribs and slanting rings.
2. Bearings with double-side drive when the motor power is large; if the single-side drive is still used, the bearing load at the gear end is too large; it is difficult to select the bearing with additional dynamic load and limit speed to meet the demand; The double-side transmission method can be used. The advantage of the double-side transmission is that the helical gear can be selected; the helix angle of the two gears is flat; the direction of rotation is reversed; then the smoother transmission quality is achieved; no axial load occurs. The bearing used for this kind is the cylindrical roller bearing NU type without inner side ring; if the double-side transmission still uses spur gear, it should be selected to accept the bearing with a certain axial force; usually the inner ring has a single rib. Cylindrical roller bearing NJ type.

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