Railway rolling stock bearing (2)

Source: Bearing network time: 2012-12-28

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(2) Spherical roller bearing The advantage of using spherical roller bearing is that there is no skew compensation between the axle box and the bogie frame. The axle box bearing of the ND2 diesel locomotive imported from Romania is SKF bearing. C-type spherical roller bearing produced by the company. Its type is suitable with domestic bearing 3G4053736KT. The roller of this type of bearing is symmetrical; the inner ring has no outer rib; the middle rib is separable; the roller and outer ring are Line touch; the useful length of the roller is longer; the service life is slightly larger than the asymmetric spherical roller bearing of the same profile.
(3) The bearings for the tapered roller bearing locomotive axlebox are double-row tapered roller bearings; the US ND5 diesel locomotive is loaded with the AP-type bearings produced by TIMKEN. The bearings are of the British standard; B, C, D, E, F, G, etc.; different from the axles used for different grades.
2. Traction motor bearing (1) traction motor armature bearing traction motor is the primary equipment in the electric locomotive and electric drive diesel locomotive transmission system; the armature bearing is one of its primary components. The armature bearing load is large; and the traction motor The scale is constrained by the wheel diameter, the inner spacing of the two wheels and the lower limit of the locomotive; therefore, it is necessary to have such a small size and a high limit speed.
1) The bearing armature of single-side transmission usually adopts double fulcrum support; the output end of the device gear is swimming support; the commutator end is positioning support. The bearing of the output end is close to the gear; the force is the largest; it is the armature bearing The key bearing is to reduce the load; usually the cylindrical roller bearing NU type without inner rim is used. The commutator end is usually a cylindrical roller bearing NUP type with a single rib on the inner ring and a flat retaining ring; 2. Select cylindrical roller bearings with single ribs and slanting rings on the inner ring.
2) When the motor of the double-side transmission is large, if the single-side transmission is still used, the bearing load at the gear end is too large; it is difficult to select the bearing with the additional dynamic load and the limit rotation speed to meet the demand; Under the condition, 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 rotation direction is opposite; then the smoother transmission quality is obtained; no axial load occurs. The bearing suitable for this kind of use is a cylindrical roller bearing NU type without inner rim; if the double-side transmission still uses spur gear, it should be a bearing that can accept a certain axial force; usually, the inner ring has a single gear. Side cylindrical roller bearing NJ type.

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