Machine element or mechanism – Elements – Gear casings
Patent
1987-04-02
1988-12-27
Wright, Dirk
Machine element or mechanism
Elements
Gear casings
F16H 3708
Patent
active
047932104
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
In front drive cars there exists a space problem for locating the motor and transmission coaxially transversely of the frame of the vehicle.
The prior art illustrates arrangements in brochures of the assignee of this application, identified as: F1/36 WH 816009, page 3, Sept. 1981 entitled ZF - Automatgetriebe fur Personenkraft - Wagen and Lerchte Nutzkraftwagen; and F 43/301 RT 3356-683 entitled as above including "mit Frontantriebe," indicated as "3HP22"; and F 43437/RT 3397-683, June 1983 same title as preceding identified brochure, indicated as "4HP14" and "4HP18," and International application PCT/EP No. 85/00292, published Dec. 18, 1986, U.S. Ser. No. /019,380, a related copending application.
The space problem is greatly complicated or impossible to solve when engines of increased length are to be used with coaxial transmissions of the prior art. Where simple manual transmissions are used it is not possible to substitute automatic transmissions of the prior art.
BRIEF DESCRIPTION OF THE PRESENT INVENTION
The present invention solves the problem in using a reduced size planetary coupling by compacting all essential parts in a novel manner at the front of a transmission housing utilizing an integral cup shaped output element which comprises the ring gear and an output gear with teeth coaxially and peripherally close and in which output element the planetary gearing is nested. The output element has a hollow shaft journaled in a bearing at the front of the housing. One side of the planet carrier has a shaft extending through a relatively short hollow hub of the output element beyond the front of the housing and carries a free wheel clutch the reaction ring of which is carried in a housing lid. The overall transmission is thus made very compact, eliminating any rear bearing and also eliminating other space consuming arrangements of the prior art as well as the weight of the parts thus eliminated by the novel arrangement. A drive gear meshing with the output gear is readily insertable in the housing through a circular front aperture closed by a plate secured by a springclip adding to the compactness of the transmission and simplicity of assembly.
A detailed description of the invention now follows in conjunction with the appended drawing in which:
FIG. 1 symbolically illustrates the combination;
FIG. 2 shows a cross section of the physical transmission; and
FIG. 3, in close relative proximity to FIG. 2 shows in phantom lines the end cover of a prior art transmission illustrating the extra bulk which is eliminated by the invention.
In FIG. 1 the entire speed change gear automatic transmission 1 and the hydrodynamic torque converter 2 disposed between an engine (not shown) and the transmission is shown. Instead of a hydrodynamic torque converter, a hydrodynamic coupling may be used.
The transmission comprises a reduced size planetary coupling gearing 3, shift couplings A, B, E, shift brakes C, C1, D and free wheel units F, G for the selective operation and shifting of gears.
The engine, the hydrodynamic torque converter, the planetary reducing coupling gear and output element 30 with hollow hub 30' are disposed coaxially with the couplings and brakes as well as the free wheel units in relation to one another and are installed transversely in the vehicle. The driving force is transmitted by output element 30 carrying output spur gear 31 transmitting power to the spur gears 51, 52 on the lateral shaft 5, and to gear 41 on the differential gear box 4 and thus to the axle driving halfshafts 42, 43.
For compactness, the output element 30 is cupped so that the planetary gearing can nest therein, obvious from FIG. 2.
In this example, the planetary coupling gear 3 is constructed as a so-called reduced sized coupling gear with only one ring gear 32 as an output which is connected with the output spur gear 31. The drive takes place dependent on the speed, for example:
in the 1st and 2nd gear by way of the 2nd sun gear 34;
in the 3rd gear by way of the 2nd sun gear 34 and the planetary
REFERENCES:
patent: 3314307 (1967-04-01), Egbert
patent: 3494223 (1970-02-01), Mori et al.
patent: 4280374 (1981-07-01), Kubo et al.
patent: 4346622 (1982-08-01), Pierce
patent: 4468982 (1984-09-01), Fujita
patent: 4594914 (1986-06-01), Kubo et al.
patent: 4653346 (1987-03-01), Kato et al.
patent: 4676123 (1987-06-01), Kubo et al.
ZF brochure, "Automatgetriebe" (no date).
ZF brochure, "3HP22" (no date).
ZF brochure, "4HP14" (no date).
Wright Dirk
Zahnradfabrik Friedrichshafen AG.
Zalkind Albert M.
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