Rotary kinetic fluid motors or pumps – Including shaft transmission train – brake – clutch – or...
Patent
1990-04-23
1992-03-03
Look, Edward K.
Rotary kinetic fluid motors or pumps
Including shaft transmission train, brake, clutch, or...
4152161, 418171, 74606R, F01D 1500
Patent
active
050927361
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a pump arrangement in a transmission according to the preamble of claim 1 and is based on DE-C 25 29 248, FIG. 1, position 26, 27.
According to the above, it is already known in transmissions having integrated pumps and optionally connectable power take-off to drive, for example, both the pump required for the oil supply of a converter and a pressure switch, and a direct power take-off by means of a common drive shaft which has on its free end, in a housing wall, a bearing which, together with a connection part of the power take-off, is fixed by a housing wall cover.
The former type of arrangement, of course, provides that the pump be situated in a manner of difficult access in the interior of the transmission and with the supports of its stator on the intermediate walls. See also the applicant's prospectus "ZF-Hydromedia-Reversing Transmission" F 43 0751/RT 3240, p.1.
This kind of arrangement required at least one separate central bearing for the pump and costly molds for the transmission housing on account of the oil channels to be provided in the interior of the transmission in intermediate walls and for shock and vibrations absorption of the pump working at a distance from the wall reinforcements.
On the basis of the above the problems to be solved, the invention is seen as providing a pump arrangement which not only provides better accessibility (without disassembling the transmission) but also makes possible a simplified construction of the transmission housing with improved absorption of vibrations and arrangement of the oil channels.
The solution is obtained with the features of claim 1 insofar as due to the combination of the power take-off with the pump, the ,latter now rests in a main bearing of the drive shaft directly on an external housing wall in which integrally cast channels contribute to more vibration absorption. Here, the complete pump can be simply and quickly changed together with the shaft bearing only after releasing a flange connection and a central screw without engaging the transmission tractions or disassembling the whole transmission. It is also favorable that the pump rotor has its own bearing on a connection part that is dismountable together with it, and the pump stator is directly attached to the housing wall so that no separate supporting ribs have to be provided therefore in the transmission housing.
With this arrangement, it is as a rule possible to omit a central support of the drive shaft by additional bearings in the interior of the housing, and a possibility of common bearing adjustment results that saves work and parts by fastening the connection part for the power take-off shaft.
Other advantageous improvements result with the embodiments defined in the sub-claims.
When the connection part, such as hollow shaft that drives the pump rotor, is provided with an internal spline inserted in the drive shaft, the power take-off shaft can be simply introduced, when needed, and the pump rotor can be fixed with special ease axially through the housing cover. When the connection part here serves for fastening a pump rotor bearing, the latter is also easily controllable from the outside.
By means of a piston-like pump stator, it is also reliably possible to seal the transmission housing by radial seals (piston or O-rings) independently of the variations of length of the shaft.
When omitting the precise processing of the internal wall of the opening of the transmission housing, the possibility of providing in the housing cover an axial sealing with respect to the pump stator is offered.
By providing a detachable axial support both between shaft and the connection part and between the later and the bearing, an especially simple fastening of pump and stator is obtained with the possibility of easy disassembling.
By a flange-like axial fastening of the pump stator on the housing cover, the complete pump, together with the housing cover and with the bearing on the connection part, can be drawn out from the housing wall opening without being disassembled and,
REFERENCES:
patent: 1863335 (1932-06-01), Hill
patent: 2274836 (1942-03-01), Koster
patent: 3157350 (1964-11-01), Fraser
patent: 3309934 (1967-03-01), Gustafsson et al.
patent: 4245519 (1981-01-01), Herlitzek
patent: 4541510 (1985-09-01), Itoh et al.
patent: 4650398 (1987-03-01), Brandenstein et al.
patent: 4696201 (1987-09-01), Hattori et al.
Look Edward K.
Nguyen Hoang
Zahnradfabrik Friedrichshafen AG
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