Pumps – Motor driven – Fluid motor
Patent
1993-04-01
1994-10-04
Look, Edward K.
Pumps
Motor driven
Fluid motor
60341, 60339, 415110, F16D 3300, F04B 1700
Patent
active
053521005
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a pump drive for a motor vehicle automatic transmission in which a converter shell constructed together with a primary part of a torque converter is non-rotatably connected with a hollow shaft of which the other end is passed into an interior of a pump housing and drives an impeller wherein the hollow shaft is supported via a roller bearing in a bore of the pump housing while in said bore there is situated, on the side of the roller bearing facing the converter shell, a radial sealing ring having at least one sealing lip contacting the hollow shaft and, on the side facing the impeller, a sealing ring which with the hollow shaft encloses a sealing gap.
BACKGROUND OF THE INVENTION
A pump drive of the above mentioned kind has been disclosed in the publication ATZ automobile engineering periodical 91 (1989) 9, page 445. The sealing ring, designed as plastic disc, is here pressed or glued in the drilling. As result of manufacturing tolerances, this rigid fastening of the sealing ring to the pump housing could result in the sealing ring having an uneven sealing gap relative to the hollow shaft. In the extreme case, the possibility that the sealing ring touches the hollow shaft in a certain area exists whereby extreme wear occurs. These problems are further intensified by the fact that the sealing ring and the hollow shaft have different coefficients of thermal expansion.
SUMMARY OF THE INVENTION
Therefore, the problem to be solved by this invention is, in a pump drive of the above kind, to situate a sealing ring in a manner such that it always forms a uniform sealing gap with the hollow shaft.
In a pump drive of the above mentioned kind, this problem is solved by the fact that the sealing ring is floatingly passed into the bore, the sealing ring has a radial play relative to the bore and an axial play relative to its axial limit formed by an outer ring of the roller bearing and a stop. When the hollow shaft rotates, the sealing ring inserted with radial play into the pump housing can now be centered relative to the hollow shaft whereby a uniform sealing gap is obtained. Tolerances in the production of the pump housing and the support of the hollow shaft can be compensated by the radial mobility of the sealing ring as well as radial movement of the hollow shaft. The sealing gap appearing here can be designed in accordance with the required amount of oil leakage to be fed to the roller bearing. By virtue of the pressure prevailing in the interior of the hollow shaft and in the pump, the sealing ring is pressed against the outer ring of the roller bearing so that a favorable sealing effect is likewise obtained.
According to a further feature, in a design of the pump drive where the amount of oil leakage that passes the sealing gap and flows through the roller bearing is fed, via at least one reverse bore situated in the pump housing, to an oil sump or to the pump on the suction side, a spacer ring having an outer diameter corresponding to the diameter of the bore is to be situated between the side of the outer ring facing the torque converter and the radial sealing ring, the spacer ring forms, opposite the hollow shaft, an oil collector and has at least one radial reverse opening. The roller bearing which has an annular shoulder is forced by said spacer ring against a locating face of the drilling. The leakage oil collected in the oil collector is fed, via the radial bores of the spacer ring, to the reverse bore or bores.
In addition, according to a further feature, a guide disc, which has radial play relative to the hollow shaft, is to be situated between the spacer ring and the radial sealing ring. Said guide disc serves as a front centering in the assembly of the pump drive and, during the assembly, protects the sealing ring against damage.
Finally, according to a still further feature, the sealing ring is produced from a material having the same coefficient of thermal expansion as the hollow shaft. By using an adequate material for the sealing ring, it is possible to provide a perma
REFERENCES:
patent: 3210940 (1965-10-01), Bunnelle
patent: 3554661 (1971-01-01), Oglesby et al.
patent: 4592203 (1986-06-01), Stubbs
ATZ Automobiltechnische Zeitschrift 91 No. 9, 1989, pp. 445-453; H. Schopf: "Mercedes-Benz Funfgangn-Automatikgetriebe" cited in the application.
Bauknecht Gert
Bucksch Manfred
Pfalz Rainer
Look Edward K.
Nguyen Hoang
Zahnradfabrik Friedrichshafen AG
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