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HOME >Service > >maintenance

maintenance
24
2016-01
use right bearing for Energy saving part2
The first step involves optimizing the bearing selection and arrangement. The double-row cylindrical roller bearing that generates 45.1% of the losses can be replaced by a smaller, single-row cylindrical roller bearing. This means that the required space at this bearing position can be reduced by over 20%. The cylindrical roller bearing on the pressure side of Shaft 1 can also be replaced by a smaller cylindrical roller bearing
23
2016-01
use right bearing for Energy saving part1
Based on simulation methods and calculation tools developed by the Schaeffler Group and presented in the first part of this paper, three approaches regarding increased efficiency based on rolling bearings are presented
22
2016-01
Bearing Lubrication Under Extreme Condition
Rolling element or sleeve bearings often are required to operate under extreme conditions. In these instances, it is more important than ever to follow proper lubrication selection and maintenance procedures to maximize effective life and efficient performance.
21
2016-01
Rolling Bearings in High-Speed Passenger Traffic part4
The housing is an essential component of the axle box system. Bearings in low-speed applications (especially freight cars) often run with housings connected to the bogie solely by open adapters, or the housings are of a rather simple design that does not give full circumferential support. Full-bore housings (Fig. 10) allow the use of through-hardened bearing rings made of chromium steel—the most widely used material for rolling bearings in Europe.
20
2016-01
Rolling Bearings in High-Speed Passenger Traffic part3
This part of the paper describes the most important standards that bearing manufacturers have to follow during the development, design, production and testing of railway rolling bearings. In addition to the standards directly referring to bearing issues, there are standards dealing with components around the axle box bearing, such as the axles themselves. Details of these often are important for certain parts of the rolling bearing design as well. Besides some rather general standards for rolling bearings, there are three railway-specific standards in Europe (European Norm):
19
2016-01
Rolling Bearings in High-Speed Passenger Traffic part2
Passenger transport today moves significantly faster than ever before, often operating on separate tracks especially designed for high-speed trains. Accordingly, high-speed rolling bearings are very important components in the bogies of trains today. Maximum train speeds currently reach 380 km/h (236 mph) in the latest high-speed applications—80% higher than in the earlier days of high-speed traffic. This paper presents two application examples of modern, high-speed traffic, together with some typical bearing arrangements and housings. It provides insight regarding measures taken in the bearing industry to meet the requirements of contemporary, high-speed traffic, and it cites important standards and regu- lations applicable for—but not restricted to—European applications. To be precise, the focus here is on journal bearings; information on traction motor bearings, transmission bearings and housings is included, but described in less detail.
18
2016-01
Rolling Bearings in High-Speed Passenger Traffic part1
Passenger transport today moves significantly faster than ever before, often operating on separate tracks especially de- signed for high-speed trains. Accordingly, high-speed rolling bearings are very important components in the bogies of trains today. Maximum train speeds currently reach 380 km/h (236 mph) in the latest high-speed applications—80% higher than in the earlier days of high-speed traffic. This paper presents two application examples of modern, high-speed traffic, together with some typical bearing arrangements and housings. It provides insight regarding measures taken in the bearing industry to meet the requirements of contemporary, high-speed traffic, and it cites important standards and regu- lations applicable for—but not restricted to—European applications. To be precise, the focus here is on journal bearings; information on traction motor bearings, transmission bearings and housings is included, but described in less detail
05
2016-01
Grease Lubrication Mechanisms in Rolling Bearing Systems part 3
The main differences between grease and oil for seal lubrication are related to starvation (replenishment of the seal lip) and boundary film formation by the thickener material. Replenishment of the contact is caused by shear and oil bleeding from the grease. The sealing action of grease is ascribed to its stiffness, meaning that the grease will not easily flow away from the sealing contact. In addition, the grease will form pockets in multiple-lip seals where the flow of contaminant particles。
04
2016-01
Grease Lubrication Mechanisms in Rolling Bearing Systems part 2
Both base oil andthickener are known to enter the bearing. The lubricating film thickness in grease-lubricated bearings is determined by boundary layers formed by thickener material hR and by the hydrodynamic action of the base oil hEHL (elastohydrodynamic lubrication, EHL)
03
2016-01
Grease Lubrication Mechanisms in Rolling Bearing Systems party
Grease lubrication has clear advantages over oil lubrication: Grease does not leak easily; it has sealing properties; and it protects bearing surfaces from corrosion. Its disadvantages are grease-life limitations and a limited cooling ability. Moreover, in some applications there is a risk of grease starvation, which leads to reduced lubricating films. However, if the right grease, sealing system and/or lubrication system are chosen, then grease lubrication offers clear benefits. This article summarizes aspects of grease lubrication mechanisms in rolling bearings.
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