Positive displacement meshing screw machine

Details Positive displacement meshing screw machine Positive displacement meshing screw machine

1982-09-29

1984-09-11

Vrablik, John J.

Rotary expansible chamber devices

Interengaging rotating members

Non-parallel axis

F04C 200

Patent

active

044707819

ABSTRACT:
A positive displacement machine such as a hydraulic pump or motor comprises a screw with several threads rotatable inside a casing and meshing with at least one pinion, and at least one low pressure port and at least one high pressure port located in the casing on either side of the pinion. The portion of the casing comprised between a low pressure port and a high pressure port is in leaktight contact with the whole length of the top of at least one thread of the screw. When said portion is in contact with the tops of two threads, no pinion tooth is in mesh between them. The threads terminate on each side of the screw on substantially equal diameters and have in their central section a swollen portion with an external diameter larger than at the ends of the threads.

REFERENCES:
patent: Re30400 (1980-09-01), Zimmern
patent: 313695 (1964-05-01), Zimmern
patent: 1654048 (1927-12-01), Myers
patent: 3180565 (1965-04-01), Zimmern

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