Internal gear machine with rotary valve disk

Patent 4380420 Issued on April 19, 1983. Estimated Expiration Date:

October 7, 2001. 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.

Abstract Claims Description Full Text

Patent References

3453966

3825376

3895888

3899270

3905728

Rotary fluid displacement apparatus with orbiting toothed ring member
Patent #: 3944378
Issued on: 03/16/1976
Inventor: McDermott

Gerotor gearset device Patent #: 4087215
Issued on: 05/02/1978
Inventor: Miller

Inventors

Assignee

Rexroth GmbH

Application

No. 06/309395 filed on 10/07/1981

US Classes:

418/61.3, Rotor has one less lobe than cylinder (i.e., Gerotor type)418/186Supply and exhaust passages in working member

Examiners

Primary: Vrablik, John J.

Attorney, Agent or Firm

Striker; Michael J.

International Classes

F04C 2/10 (20060101)
F04C 2/00 (20060101)
F01C 19/08 (20060101)
F01C 19/00 (20060101)

Foreign Application Priority Data

1978-10-14 DE

Abstract

The hydraulic internal gear machine includes a positive displacement unit for the working fluid, the unit being formed of a rotary outer gear which is rigidly connected to a rotary control plate provided with control openings arranged between respective teeth of the outer gear. An inner gear surrounds the outer gear and meshes at one point with the latter to define a plurality of increasing fluid displacement chambers. The inner gear is supported in the machine housing for performing a circular wobbling movement about the center axis of the outer gear. A stationary control plate adjoins the rotary control plate and is provided with second control openings cooperating with the first control openings in the rotary plate. An axially movable plunger is spring-biased against the stationary control plate and forms with the housing cover two annular spaces connected respectively to the intake port and to the discharge port of the working fluid. Each annular space communicates with an assigned set of the second control openings in the stationary plate.