Hex Screws,Screws And Bolts,Screw And Nut,Fastener Bolt NINGBO YWC IMP. & EXP. CO.,LTD , https://www.nbywc-fastener.comRailway Rolling Stock Bearings (2)
(2) Spherical Roller Bearings
One of the main advantages of using spherical roller bearings is their ability to compensate for misalignment between the axle box and the bogie frame. The axle box bearing used in the ND2 diesel locomotives imported from Romania is an SKF C-type spherical roller bearing. This type is compatible with domestic bearings such as 3G4053736KT. The design features symmetrical rollers, an inner ring without an outer flange, a separable center rib, and line contact between the roller and the outer ring. The roller's effective length is longer, which contributes to a slightly longer service life compared to asymmetric spherical roller bearings of the same profile.
(3) Tapered Roller Bearings
Tapered roller bearings are commonly used in locomotive axle boxes, typically in a double-row configuration. For example, the US ND5 diesel locomotive uses AP-type tapered roller bearings produced by TIMKEN. These bearings follow British standards (B, C, D, E, F, G, etc.), and different types are selected based on the axle specifications and performance requirements.
2. Traction Motor Bearings
(1) Armature Bearings
The traction motor is a key component in electric locomotives and electrically driven diesel locomotives. The armature bearing is one of its critical parts. It must handle heavy loads and operate within the constraints of wheel diameter, the distance between wheels, and the lower limit of the locomotive’s structure. Therefore, it requires a compact design and high-speed capabilities.
1) In single-side transmission systems, the armature bearing usually uses a dual-support configuration. The output end of the gear is designed as a floating support, while the commutator end is fixed. The bearing at the output end, located near the gear, experiences the highest load and is considered the critical bearing. To reduce the load, cylindrical roller bearings of the NU type (without an inner ring) are typically used. At the commutator end, a NUP-type cylindrical roller bearing with a single rib on the inner ring and a flat retaining ring is often employed. For larger motors, cylindrical roller bearings with a single rib and slanted rings on the inner ring may be used.
2) When dealing with large double-side transmission motors, using a single-side transmission can lead to excessive bearing load at the gear end. It becomes difficult to find a bearing that meets both dynamic load and speed requirements. In such cases, a double-side transmission system is preferred. This method allows the use of helical gears with matching helix angles, which results in smoother operation and eliminates axial loads. For this application, a NU-type cylindrical roller bearing without an inner ring is suitable. If spur gears are still used, a bearing capable of handling some axial force, such as the NJ-type cylindrical roller bearing with a single rib on the inner ring, should be selected.
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Source: Bearing Network | Time: 2012-12-28