Hydraulic controlled fan clutch with integral cooling

摘要

A hydraulically controlled fan drive system ( 12 ) having a method of engagement includes a housing assembly ( 20 ) containing a hydraulic fluid ( 48 ) and an engaging circuit ( 36 ). The engaging circuit ( 36 ) includes a pitot tube ( 152 ) coupled within the housing assembly ( 20 ) that receives at least a portion of the hydraulic fluid ( 48 ). An engaging circuit ( 36 ) engages the housing assembly ( 20 ) to a fan shaft ( 44 ) in response to supply of the hydraulic fluid ( 48 ) from the pitot tube ( 152 ).