U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Electrical commutation apparatus

Patent 4767292 Issued on August 30, 1988. Estimated Expiration Date: Icon_subject July 20, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Patent References

Re25257

2976843

2999482

3156157

3289602

3778198

3799201

3917437

3922120

Rotary piston mechanism
Patent #: 3996901
Issued on: 12/14/1976
Inventor: Gale ,   et al.

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Inventor

Assignee

Application

No. 07/075445 filed on 07/20/1987

US Classes:

418/2, WITH SIGNAL, INDICATOR OR TRANSPARENT INSPECTION MEANS418/270, MISCELLANEOUS418/61.3, Rotor has one less lobe than cylinder (i.e., Gerotor type)91/362, Means provides incremental movements (e.g., stepper type, etc.)91/53ENGINE ROTATING OR STARTING TYPE

Examiners

Primary: Vrablik, John J.

Attorney, Agent or Firm

International Classes

F04C 2/10 (20060101)
F04C 2/00 (20060101)

Abstract

A fluid motor having a gerotor gear set includes a first member having internal teeth and a second member having external teeth. The second member is rotatably and orbitally mounted within the first member. The teeth of the first and second members cooperate to define a plurality of variable volume working chambers. Some of said working chambers expand and other of said working chambers contract upon relative rotatable and orbital movement between said first and second members. A plurality of electrically controlled valves are provided, each working chamber having an associated valve. Each valve selectively communicates, in one condition, its associated working chamber with an inlet passage, which is, in turn, connected to a source or pressurized fluid, or, in a second condition, its associated working chamber to an outlet passage, which is, in turn, connected to a reservoir. Each of the valves is responsive to a respective electrical control signal for placing the valve in the first or second condition.

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