Check thermal capacity The selection checks use the relevant temperature, application and speed factors. Both examples also verify thermal capacity. The electric example transmits 9.5 kW during operation. Its corrected thermal capacity is approximately 10.3 kW, so this check forms a meaningful part of the selection. Mechanical torque capacity and thermal capacity answer different questions. Both must suit the intended duty. Define the application before choosing the gearbox A useful enquiry brings together: » Driver type, power and operating speed. » Required output speed and torque. » Starting conditions and possible overloads. » Operating hours, duty pattern and required life. » Output connection and external shaft loads. » Mounting arrangement, ambient conditions and available space. Drawings and a discussion of the machine’ operation help establish how those details fit together. At jbj Techniques, planetary gearbox selection begins with that understanding. It allows the gearbox, input connection, output arrangement and supporting components to be considered as one installation. That is Engineering Beyond Product Supply: using the application requirements to arrive at a specification that can be explained and checked. The following pages present the two worked selection examples, including the calculations, reference tables and graphs.
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