Abstract
The possibility of increasing the service life of 18-100 three-piece bogies by using taper bearing units with different types of adapters is considered in the article. The main task is the need to increase the longevity of the running parts of freight cars by reducing their dynamic loading. The solution of this problem is possible by improving the axle boxes. To determine possible design solutions, an analysis was made of modern domestic and foreign designs of bogies using bearing assemblies with adapters and three types of adapters with the highest quality indicators, namely the half-box of the 18-7020 bogie, adapter with elastic packing and adapter of the 18-4129 bogie. Three models of adapters were investigated using the finite-elements method, which, in accordance with reported manufacturer’s data, have high reliability index and can provide equal load distribution between bearing systems rollers. The results of mathematical simulation suggest that the forces applied to the bearing systems rollers largely depend on the adapter design. Furthermore, the studied adapter designs are not acceptable and require further designing.
Highlights
The main task of the railway transport is uninterrupted delivery of cargo and passengers with the maximum speed, minimal cost of transport and providing absolute safety in operation
As the long experience of operating freight cars proves, it is the inadequate reliability of axle boxes that led to 2066 car uncoupling accidents with moving trains in 1995-2017
The combined loads of the axle box influence significantly the kinematics and dynamics of its elements: along the contact line of the rollers with the raceways of the bearing rings, the radial load concentration appears due to the non-alignment of the rings, and along the ends of the rollers which contact the sides of the rings appear significant axial friction forces [3,4,5]
Summary
The main task of the railway transport is uninterrupted delivery of cargo and passengers with the maximum speed, minimal cost of transport and providing absolute safety in operation. The service life of the cars in operation was prolonged repeatedly. The middle age of a multipurpose gondola car is 24 years, the normative lifetime being 22 years. It leads to the situation when every car of Ukrzalyiznytsya rolling stock on average 3.5 times a year is sent for current (unplanned) repair with uncoupling, that leads to failure of about 720 cars every day. One of the most important elements of the freight car design is axle boxes with roller bearings. As the long experience of operating freight cars proves, it is the inadequate reliability of axle boxes that led to 2066 car uncoupling accidents with moving trains in 1995-2017
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: International Journal of Engineering & Technology
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
