Gyrotor hydraulic motor - Patent 1158165

(19)

(11)

EP 1 158 165 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	12.12.2001 Bulletin 2001/50

(43)	Date of publication A2:
	28.11.2001 Bulletin 2001/48

(21)	Application number: 01112161.3

(22)	Date of filing: 17.05.2001

(51)	International Patent Classification (IPC)⁷: F04C 2/10

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

25.05.2000 US 579164

(71)	Applicant: EATON CORPORATION
	Cleveland, Ohio 44114-2584 (US)

(72)	Inventors:
	Haarstad, Donald M. Chaska, MN 55318 (US) Kassen, Gary R. Chanhassen, MN 55317 (US) Millar, Jarett D. Minneapolis, MN 55404-3201 (US) Bernstrom, Marvin L. Eden Prairie, MN 55347 (US)

(74)	Representative: Schwan - Schwan - Schorer
	Patentanwälte European Patent Attorneys Elfenstrasse 32 81739 München 81739 München (DE)

(54)	Gyrotor hydraulic motor

(57) A multi-speed gerotor motor of the type including a fluid displacement mechanism (21) defining expanding (33E) and contracting (33C) fluid volume chambers, a stationary valve member (19), defining a plurality N of stationary valve passages, and a movable valve member (43). The upstream end of each valve passage communicates with the movable valve member (43), and the downstream end of each valve passage communicates with one of the volume chambers. In a plurality M of the stationary valve passages (79A through 79E) the upstream (81) and downstream (83) passage portions are blocked from direct communication, and for each there is a control valve member (103) which can, selectively, permit fluid communication for normal, low-speed, high-torque operation, or can block such communication, and recirculate the associated volume chambers for highspeed, low torque operation.

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