Engineering Solutions: Pulley & Bearing

Customer Need 

The customer needed to replace a machined cast iron pulley and bearing to reduce wear and improve corrosion resistance in a belt-drive tensioner system.

 

MPP Solution

MPP’s solution was to utilize a copper-steel material with a tensile strength of 50,000 psi and a minimum yield strength of 40,000 psi. In order to reduce the weight of the finished assembly, weight-saving holes were incorporated into the tooling. The holes are arcuate-shaped to maximize material and weight savings. The pulley undergoes steam oxide-blackened surface treatment, which provides 50% better wear than cast iron, and results in surfaces with significantly better corrosion resistance. A precision machining operation is then performed to meet the extremely tight tolerance specification of the bearing bore and to provide a groove for the retainer ring. The bearings and retainers are installed to provide complete units ready for assembly in the tensioner system.

“To reduce the weight of the finished assembly, weight-saving holes were incorporated into the tooling.”

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