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MDA Technologies 3/2015

MDA Technologies 3/2015

FAG’s new housing

FAG’s new housing design improves, operational reliability and flexibility Compared to conventional plummer block housings, SNS plummer block housing from Schaeffler increases the operating life of the bearing by up to 50 percent. This is made possible by the new housing design, which ensures optimum load distribution in the bearing. Design optimizations facilitate improved monitoring, lubrication and a high level of robustness and operational reliability, and thus allow the housing and bearing to be used in a particularly flexible and cost-effective manner while significantly reducing the lifecycle costs. It can also be installed as a 1-to-1 replacement for numerous conventional housings. Bearing and housing as a complete system The main objective of the development work on the new plummer block housing was to increase the bearing operating life in the main load direction without decreasing important performance characteristics, such as rupture loads. The prerequisite for the optimized design was the analysis of the bearing and housing as a complete system. This enabled us to take the influ- 26 MDA Technologies 3/2015

MACHINE ELEMENTS ence of the housing design on the load in the bearing into consideration and to make the corresponding optimizations. The newly-developed and patented design of the FAG SNS plummer block housing distributes the bearing load over two symmetrically-arranged surfaces. This makes a positive change to the load distribution in the bearing and means that the bearing is subjected to a lower load. The operating life of the bearing is thus increased by up to 50 %, since the distribution of the individual rolling element loads has a considerable influence on the fatigue life that the rolling bearings can achieve. Optimized load distribution protects the bearing The following two housing designs each show the distribution of load in the bearing with a conventional housing with crosspieces and with a housing with a cutaway, as is the case with the new SNS series. If a spherical roller bearing fitted in a housing is subject to load in the main load direction (vertically in the direction of the housing support surface here), the load is distributed in the contact point underneath the bearing as shown in Figure 1. This clearly shows that the support in the center leads to an unfavorable, restricted load zone. This increases the load on the roller on the apex, while the load is removed from the neighboring rollers. If a bearing of the second housing design is MDA Technologies 3/2015 27

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