Rotary expansible chamber devices – Convertible or changeable by assembly or disassembly
Patent
1995-12-29
1997-10-07
Vrablik, John J.
Rotary expansible chamber devices
Convertible or changeable by assembly or disassembly
418132, 418169, F03C 208, F04C 210
Patent
active
056740603
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic gear machine, and therefore a gear pump or a gear motor, the gear machine being, in particular, an internal gear machine as described herein.
In known internal gear machines, an internally toothed hollow gear and a smaller externally toothed gear which engages with the hollow gear are contained within a chamber of a multipart housing. In order to avoid leakage losses on the high-pressure side of the machine through an axial slot between the gear wheels and a housing part, a sealing plate is arranged on the side of both gear wheels axially between them and a part of the housing, said plate being pressed against the face side of the gear wheels by a pressure field which is connected with the high pressure side. Internal gear machines are known (Federal Republic of Germany 25 54 960 C2) which have a sealing plate only on one face side of the two gear wheels. In other known internal gear machines, there is a sealing plate on each face side of both gear wheels.
The pressure field which can act with the high-pressure on the high pressure side of the machine is limited in a plane extending perpendicular to the axes of the two gear wheels by a packing which seals off the gap between the sealing plate and the housing part. Depending on whether the packing is inserted into the sealing plate or into the housing part, it is said that the pressure field is located in the sealing plate or in the housing part. It is endeavored to produce a sealing plate in inexpensive fashion by simple stamping and embossing processes. In that case, it is difficult to impart the sealing plate the shape which is necessary for the development of the pressure field within it. It therefore seems more favorable to provide the pressure field in the housing part which is adjacent to the sealing plate and which is customarily produced as a casting and in which the shape desired for the development of the pressure field can be produced already during the casting process.
Generally, the market today requires a clockwise rotating version and a counterclockwise rotating version of a given type of gear machine. It is desirable to be able to produce both embodiments with the greatest possible number of identical parts. In the case of the gear machine having a sealing plate on both sides of the gears and having a pressure field developed in each of the two sealing plates, it is possible to mount the same two sealing plates transposed with respect to each other in the two embodiments, so that the same two sealing plates can be used for both versions. In the event that an axial pressure field is arranged in a housing part which is adjacent to the sealing plate, a different housing part has been used up to now, depending on whether the gear machine was a clockwise or a counterclockwise embodiment.
SUMMARY OF THE INVENTION
The object of the present invention is so to develop a gear machine of the type described herein in such a manner that a housing part which is provided with a pressure field can be used both for a counterclockwise embodiment and for a clockwise embodiment.
According to aspects of the invention a second pressure field is present in the housing part and the first housing part is located only on the one side and the second housing part only on the other side of a center plane which is defined by the axes of rotation of the two gear wheels, so that a piece of the housing part is still present between the two pressure fields. In a concrete embodiment of a gear machine, of course, only one of the two pressure fields is in each case limited by a packing and acted on by the high pressure on the high pressure side of the machine. The second pressure field is recognizable merely by the fact that the housing part is provided also to receive a packing at a place other than that used at the time. Due to the fact that there is still a piece of the housing part present between the two pressure fields, assurance is had that a packing which is intended to limit one of
REFERENCES:
patent: 3289599 (1966-12-01), Eckerle et al.
patent: 3303793 (1967-02-01), Morita
Buchmuller Klaus
Pippes Reinhard
Eckerle-Rexroth GmbH & Co. KG
Farber Martin A.
Vrablik John J.
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