Ametek, Inc.

Daniel L Kirtz

David B Finkenbinder

Daniel F McCauley

Michael R Volkert

A bypass discharge motor assembly with improved noise reduction includes a motor assembly having a rotatable shaft. A working air fan assembly and a cooling fan are rotated by the shaft. A cooling fan housing is coupled to the motor assembly and partially encloses the cooling fan. The cooling fan housing has at least one radial air entry part for radially receiving cooling air drawn into the housing by the cooling fan.

Motor cooling fan housing with muffler

A bearing protection assembly protects a motor having a rotating shaft. The motor includes a bearing carried on the shaft, having one side proximal the motor and one side distal the motor. A support member is positioned adjacent the bearing's distal side and disposed about the shaft. A retaining member is disposed about the shaft, the retaining member and the support member and forms an annular cavity about the shaft. A non-lubricated seal is captured and may be compressed in the annular cavity precludes migration of moisture toward the bearing along the shaft. The seal is preferably made of expanded polytetrafluoroethylene. Alternative embodiments allow the seal to be positioned and secured in various ways with respect to the bearing.

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Stow, OH, United States of America

Daniel L Kirtz