Borgwarner Inc.

Dale Pickelman

Theodore A Malott

James Ignatovich

A hydraulically controlled fan drive system () having a method of engagement includes a housing assembly () containing a hydraulic fluid () and an engaging circuit (). The engaging circuit () includes a pitot tube () coupled within the housing assembly () that receives at least a portion of the hydraulic fluid (). An engaging circuit () engages the housing assembly () to a fan shaft () in response to supply of the hydraulic fluid () from the pitot tube (). An electrical control circuit () having a relief valve assembly () coupled to a main controller () is used to control the fluid pressure within the pitot tube () that controls the engagement of the housing assembly ().

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Marshall, MI, United States of America

Dale Pickelman