Eaton Corporation

James M LeClair, Jr

Jarett D Millar

Wayne B Wenker

Andrew T Miller

Bernie W Neuhaus

A rotary fluid pressure device () having a housing (), inlet and outlet ports (), a gerotor gear set (), a valve member () and an input-output shaft (). A seal assembly () is disposed radially between the shaft () and the housing (). The seal assembly comprises, in the order of leakage flow from a case drain region (), a high pressure shaft seal (), an annular chamber () in which is disposed a rigid back-up member () for the seal (), a drain passage () communicating from the annular chamber () to a case drain port (), and a low pressure shaft seal (). The back-up member () may cooperate with either the housing () or the seal () or the input-output shaft () to define a fluid passage (), so that any leakage flow past the high pressure shaft seal () flows through the drain.

Vented high pressure shaft seal

A gerotor motor including a brake package, and a method for setting the load holding torque of the brake package. The endcap assembly ( ) defines a set of internal threads ( ) disposed adjacent a brake package piston member ( ). An enclosure member ( ) defines a spring seat ( ) for a set of Belleville washers ( ), and defines a set of external threads ( ) engaging the internal threads ( ). Upon assembly of the motor and brake package, a resistance load is applied to a motor output shaft ( ) corresponding to a desired load holding torque. The motor is pressurized sufficiently to rotate the output shaft in opposition to the resistance load. The enclosure member ( ) is rotated so that it moves axially in a direction to increase the bias preload on the Belleville washers ( ) until the output shaft ( ) no longer rotates.

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Shakopee, MN, United States of America

James M LeClair, Jr