Second-hand Nuts And Bolts Machine Second-hand nuts and bolts machine,nuts machine,bolts machine,fastener used machine NINGBO YWC IMP. & EXP. CO.,LTD , https://www.nbywc-fastener.com Railway Rolling Stock Bearings (2)
(2) Spherical Roller Bearings
Spherical roller bearings are widely used in railway rolling stock due to their ability to compensate for misalignment between the axle box and the bogie frame. One example is the SKF C-type spherical roller bearing used in the axle boxes of the ND2 diesel locomotives imported from Romania. This bearing type is compatible with domestic bearing model 3G4053736KT. The design features symmetrical rollers, an inner ring without an outer flange, a separable center rib, and line contact between the rollers and the outer ring. The longer effective roller length contributes to a slightly longer service life compared to asymmetric spherical roller bearings of similar profiles.
(3) Tapered Roller Bearings
Tapered roller bearings are commonly used in locomotive axle boxes, particularly in double-row configurations. For example, the US ND5 diesel locomotive uses AP-type tapered roller bearings manufactured by TIMKEN. These bearings follow British standards and come in various types such as B, C, D, E, F, and G, each suited for different axle specifications.
2. Traction Motor Bearings
(1) Armature Bearings
In electric locomotives and electrically driven diesel locomotives, the traction motor plays a critical role in the power transmission system. The armature bearing is one of its essential components. Due to high load conditions and space constraints imposed by wheel diameter and axle spacing, these bearings must be compact yet capable of operating at high speeds.
1) In single-side transmission systems, the armature bearing typically uses a double-support configuration. The gear output end is designed as a floating support, while the commutator end is fixed. The bearing near the gear experiences the highest load and is usually a NU-type cylindrical roller bearing without an inner ring. On the commutator side, a NUP-type cylindrical roller bearing with a single rib on the inner ring and a flat retaining ring is often used.
2) For large motors using double-side transmission, single-side configurations may not be sufficient due to excessive loads at the gear end. In such cases, double-side transmission is preferred. This allows the use of helical gears with matching helix angles and opposite rotation directions, resulting in smoother operation and no axial load. The ideal bearing for this setup is a NU-type cylindrical roller bearing without an inner ring. If spur gears are still used, a bearing that can handle some axial force, such as an NJ-type cylindrical roller bearing with a single-ribbed inner ring, is suitable.
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Source: Bearing Network | Date: December 28, 2012