Seal for a joint or juncture – Seal between relatively movable parts – Circumferential contact seal for other than piston
Reexamination Certificate
2006-10-24
2006-10-24
Mitchell, Katherine (Department: 3677)
Seal for a joint or juncture
Seal between relatively movable parts
Circumferential contact seal for other than piston
C277S549000, C277S562000, C277S563000, C277S572000
Reexamination Certificate
active
07125020
ABSTRACT:
A rotary fluid pressure device (11) having a housing (13,31), inlet and outlet ports (21,23), a gerotor gear set (15), a valve member (51) and an input-output shaft (49). A seal assembly (73) is disposed radially between the shaft (49) and the housing (31). The seal assembly comprises, in the order of leakage flow from a case drain region (63), a high pressure shaft seal (77), an annular chamber (71) in which is disposed a rigid back-up member (79;91) for the seal (77), a drain passage (81) communicating from the annular chamber (71) to a case drain port (47), and a low pressure shaft seal (83). The back-up member (79;91) may cooperate with either the housing (31) or the seal (77) or the input-output shaft (49) to define a fluid passage (87,89;93,95), so that any leakage flow past the high pressure shaft seal (77) flows through the drain.
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LeClair, Jr. James M.
Millar Jarett D.
Miller Andrew T.
Eaton Corporation
Kasper K. J.
Millar Jarett D.
Mitchell Katherine
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