Internal gear pump and power steering device

Details Internal gear pump and power steering device Internal gear pump and power steering device

2007-07-18

2010-12-28

Boehler, Anne Marie M (Department: 3611)

Motor vehicles

Steering gear

With fluid power assist

C418S171000

Reexamination Certificate

active

07857092

ABSTRACT:
An internal gear pump has a first port opening into pumping chambers and provided at one side with respect to a first axis interconnecting a confinement portion of the pumping chambers having a maximum volumetric capacity and a deeply-meshed-engagement portion of the pumping chambers having a minimum volumetric capacity, a second port opening into the pumping chambers and provided at the opposite side with respect to the first axis, a first pressure introduction passage intercommunicating the first port and a first-port side area of a clearance space defined on an outer periphery of an outer rotor, and a second pressure introduction passage intercommunicating the second port and a second-port side area of the clearance space. The clearance space of a direction of a second axis perpendicular to the first axis is dimensioned to be greater than the clearance space of a direction of the first axis.

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