Eaton Corporation

Jarett D Millar

James M LeClair, Jr

Marvin L Bernstrom

Wayne B Wenker

Karen J Radford

Andrew T Miller

Bernie W Neuhaus

Ryan C Bergerson

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.

Rotary fluid pressure device and improved integral brake assembly

A two-speed gerotor motor of the type having a stationary valve member (19) defining a plurality of stationary valve passages, each including an upstream passage portion for commutating fluid communication with a moveable valve member (43), and a downstream passage portion in continuous fluid communication with a volume chamber (33) of the gerotor gear set. In some of the stationary valve passages (113), the upstream (115) and downstream (117) passage portions are blocked from direct fluid communication. A control valve spool (89) has a first position (FIG. 8) permitting unrestricted fluid communication between the upstream and downstream passage portions, for normal low-speed operation. The control valve spool has a second position (FIG. 9) blocking communication between the upstream (115) and downstream (117) passage portions, and connecting all of the downstream portions together, communicating with a fluid accumulation region (91), such that fluid from those volume chambers recirculates, to provide a high-speed mode of operation.

Two speed geroter motor with external pocket recirculation

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Minneapolis, MN, United States of America

Jarett D Millar