Machine element or mechanism – Elements – Gear casings
Reexamination Certificate
2000-01-05
2001-12-11
Herrmann, Allan D. (Department: 3682)
Machine element or mechanism
Elements
Gear casings
C403S359100, C403S374300, C464S177000
Reexamination Certificate
active
06327934
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a front-axle output of an automatic transmission.
A front-axle transmission according to the preamble, the Applicant's 4 HP 18, has been disclosed, e.g. in the book “Automatische Fahrzeuggetriebe” by H. J. Forster, Springer Verlag 1991, page 473. This known transmission has a front-axle output configurated in a manner such that torque is transmitted, via an intermediate gear from a front-axle spur pinion, having an input gear to an output gear; each input, intermediate and output gear is designed as a spur gears. In the hub of the output gear is supported, with a positive fit, a pinion shaft of a pinion that engages a differential and is a bevel drive. Next to the support in the output-gear hub, the pinion shaft is supported in an area adjoining the pinion.
The output spur gear is supported on each side of the gear by a tapered roller bearing with an adjusting spacer. The tapered roller bearing situated upon the side remote from the differential is adapted and supported by its outer rollway body in a cover of the front-axle output housing. The outer rollway body of the other tapered roller bearing is supported in an intermediate plate disposed between the lid and the front-axle output housing, the housing being sealed with the intermediate plate.
On the side of the output gear, facing the differential or the pinion, is attached a spacer sleeve with a cup spring set and a parking interlock gear, said parts being guided via the pinion shaft. The parking interlock gear lies with an end remote from the output gear on a shaft shoulder of the pinion shaft and with its other end on the cup spring set which Is supported by the spacer sleeve on the output gear.
A disadvantage of this known solution is the great multiplicity of parts and a correspondingly high assembly expense from which high costs result from production and eventual repair works.
Therefore, the problem on which this invention is based is to provide a front-axle output of an automatic transmission which has a small number of parts, is easy and economical to assemble and has the lightest possible weight.
SUMMARY OF THE INVENTION
By virtue of the inventive development of the output spur gear with an axial extension as a side shaft, the connecting point between the pinion shaft and the output spur gear or the side shaft can be transferred to an area of low bending stress along the pinion support, it being possible to use the support already available in the area of the pinion support.
The side shaft, as well as the pinion shaft, can be dimensioned in this area with a smaller diameter or with less wall thickness than In the area of the output spur gear support and of the pinion support, since these can have a lesser bending resistance torque on the connecting point due to the transfer of their connecting point from the area of highest introduction of force and bending stress to the output spur gear support. Therefrom results the advantage of economy in material and weight, since the side shaft can be designed resistant to bending on the area adjoining the output spur gear.
Besides, the multiplicity of parts can be clearly reduced with the inventive solution, since in the support of the side shaft with the output spur gear, it is possible to omit a support on both sides of the output spur gear whereby it is possible, e.g. to spare on the side of the pinion a roller bearing with corresponding support in an intermediate plate provided precisely therefor with additional sealing points.
The considerable simplification of the construction offers the added advantage of reducing assembly and manufacturing costs.
Another simplification of the front-axle output configuration results when the side shaft is designed forming a single piece with the parking interlock gear. Thereby can be advantageously spared additional fastening elements for the parking interlock gear and the assembly thereof.
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Revue Technique Automobile, “Audi A4; Transmissions automatique”, vol. 51, No. 581 dated Feb. 1996, pp. 66-73, XP002088901 Boulogne-Billancourt, FR. (to follow).
Föerster, Hans Joachim, “Automatische Fahrzeuggetrieb”, Germany: Springer-Verlag, XP002088902, pp. 472-473, Figs. 14.37A-C.
Davis & Bujold P.L.L.C.
Herrmann Allan D.
ZF Friedrichshafen AG
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