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| Quantity: | |
|---|---|
BT2-8670
KMY
1. BT2-8670 bearings for high speed railways.The bearings run at speeds above 200km/h and require high load carrying capacity. As the double row tapered roller bearings have a better sealing structure and the clearance has been adjusted before installation, this type of bearing is mostly used for high speed railways.
2. BT2-8670 bearings for locomotives Railway locomotive bearing vehicle axle system due to different application
conditions using different structures, locomotive passenger cars have axle box, bearing through the axle box and bogie
connected. Generally use more cylindrical roller bearings.
3. BT2-8670 bearings for freight cars Wheel pair bearings generally use more cylindrical roller bearings.
4. BT2-8670 bearings Generally for both sides with sealing device double row cylindrical bearings or two pairs of single side with sealing device single row cylindrical roller bearings, bearing pre-installed grease
| Bearing Number | Inner Diameter mm | Outer Diameter mm | Thickness mm |
| Z-505613.01.TR2 | 346.075 | 488.95 | 200.025 |
| Z-517498.TR2 | 415.925 | 590.55 | 244.475 |
| Z-517498.01.TR2 | 415.925 | 590.55 | 244.475 |
| Z-578129.TR2 | 415.925 | 590.55 | 244.475 |
| Z-515494.TR2 | 406.4 | 609.524 | 177.8 |
| Z-507670.TR2 | 406.4 | 574.675 | 157.162 |
| Z-525845.TR2 | 406.4 | 546.1 | 185.738 |
| Z-505611.02.TR2 | 396.875 | 546.1 | 158.75 |
| Z-579745.TR2 | 384.175 | 546.1 | 222.25 |
| Z-505615.TR2 | 384.175 | 546.1 | 222.25 |
| Z-581097.TR2 | 381 | 590.55 | 244.475 |
Grease
When selecting the correct axlebox bearing execution, one of the main tasks is the choice of the right grease and quantity of grease. There are quite different application parameters to be considered, such as the engineering requirements for high-speed operation as well as heavy loads, different climatic and track conditions etc. In addition, standards and grease requirements like European EN and American AAR standards have to be fulfilled. Also, there are national requirements, such as in many European countries, in China and Russia, as well as individual customer specifications. The grease has to pass all chemical, mechanical and tribology testing procedures in accordance with the European Standard EN 12081. In addition, endurance testing of the TBU has to fulfil the requirements of EN 12082. Extended endurance and dynamic simulation tests are being carried out on SKF railway test rigs, to confirm the expected high mechanical and thermal stability as well as resistance to corrosion. More information is provided in the testing section of this chapter († page 99). The global trend is to achieve a no field lubrication (NFL) maintenance regime and to combine grease renewal with complete TBU remanufacturing, which is in most cases embedded into the complete wheelset overhaul cycle. For some specific applications like high-speed trains with very high mileage, field relubrication is performed to extend main overhaul intervals.
1. BT2-8670 bearings for high speed railways.The bearings run at speeds above 200km/h and require high load carrying capacity. As the double row tapered roller bearings have a better sealing structure and the clearance has been adjusted before installation, this type of bearing is mostly used for high speed railways.
2. BT2-8670 bearings for locomotives Railway locomotive bearing vehicle axle system due to different application
conditions using different structures, locomotive passenger cars have axle box, bearing through the axle box and bogie
connected. Generally use more cylindrical roller bearings.
3. BT2-8670 bearings for freight cars Wheel pair bearings generally use more cylindrical roller bearings.
4. BT2-8670 bearings Generally for both sides with sealing device double row cylindrical bearings or two pairs of single side with sealing device single row cylindrical roller bearings, bearing pre-installed grease
| Bearing Number | Inner Diameter mm | Outer Diameter mm | Thickness mm |
| Z-505613.01.TR2 | 346.075 | 488.95 | 200.025 |
| Z-517498.TR2 | 415.925 | 590.55 | 244.475 |
| Z-517498.01.TR2 | 415.925 | 590.55 | 244.475 |
| Z-578129.TR2 | 415.925 | 590.55 | 244.475 |
| Z-515494.TR2 | 406.4 | 609.524 | 177.8 |
| Z-507670.TR2 | 406.4 | 574.675 | 157.162 |
| Z-525845.TR2 | 406.4 | 546.1 | 185.738 |
| Z-505611.02.TR2 | 396.875 | 546.1 | 158.75 |
| Z-579745.TR2 | 384.175 | 546.1 | 222.25 |
| Z-505615.TR2 | 384.175 | 546.1 | 222.25 |
| Z-581097.TR2 | 381 | 590.55 | 244.475 |
Grease
When selecting the correct axlebox bearing execution, one of the main tasks is the choice of the right grease and quantity of grease. There are quite different application parameters to be considered, such as the engineering requirements for high-speed operation as well as heavy loads, different climatic and track conditions etc. In addition, standards and grease requirements like European EN and American AAR standards have to be fulfilled. Also, there are national requirements, such as in many European countries, in China and Russia, as well as individual customer specifications. The grease has to pass all chemical, mechanical and tribology testing procedures in accordance with the European Standard EN 12081. In addition, endurance testing of the TBU has to fulfil the requirements of EN 12082. Extended endurance and dynamic simulation tests are being carried out on SKF railway test rigs, to confirm the expected high mechanical and thermal stability as well as resistance to corrosion. More information is provided in the testing section of this chapter († page 99). The global trend is to achieve a no field lubrication (NFL) maintenance regime and to combine grease renewal with complete TBU remanufacturing, which is in most cases embedded into the complete wheelset overhaul cycle. For some specific applications like high-speed trains with very high mileage, field relubrication is performed to extend main overhaul intervals.
