192 clutches and power-stop control – Transmission and brake – Motor vehicle
Reexamination Certificate
2000-08-11
2001-09-18
Bonck, Rodney H. (Department: 3681)
192 clutches and power-stop control
Transmission and brake
Motor vehicle
C475S323000
Reexamination Certificate
active
06290048
ABSTRACT:
The invention relates to a wheel hub with integral planetary gear mechanism and multidisk brake, the outer plates of the brake being actively connected directly to the wheel hub, and the inner plates being connected to the axle body via a brake carrier, the planetary gear mechanism comprising a pinion, a planet carrier with planet gears held thereon, and an internal gear.
In wheel hubs with an integral multidisk brake and an integral planetary gear mechanism, which are used in particular for machine tools and construction machines, with regard to the arrangement of the brake there are designs in which the brake connects a component of the planetary gear mechanism to the fixed support body or clamps it to another transmission shaft (DE 44 39 360 A1 and U.S. Pat. No. 4,317,498). A drawback of these designs is that the wheel hub is not braked in an absolutely fixed position, but rather may execute a movement as a function of the magnitude of the play in the transmission.
DE 38 32 649 A1 and DE 196 40 146 C1, belonging to the present applicant, have disclosed wheel hub designs of the generic type in which the brake connects the output hub to the support body and thus fixes the output without play. DE 38 32 649 A1 shows an example of this design, but this too has a number of drawbacks. Specifically, this known wheel hub has a high design complexity and a large number of components and, consequently, is difficult to assemble. Moreover, it is of great structural length. A further significant drawback is the difficulty of access to the plates of the brake, since they are positioned between the bearings. However, in the case of vehicles it is imperative to have easy access to the plates, so that the wear levels of the brake can be determined easily. A further drawback is that the brake support plate and the internal gear carrier are two different components.
The solution described in DE 196 40 146 C1 substantially avoids the above drawbacks. However, a drawback of this solution is that the internal gear at the same time forms the wheel hub, and there can be no load balancing in the planetary gear mechanism via the internal gear. It is known that in planetary gear mechanisms the torques are distributed over a plurality of planet carriers. If, in this case, two adjacent transmission members (sun/planet; planet/internal gear) are fixed radially, depending on the position of the gears the torques will be distributed differently between these gears. Furthermore, this design provides for difficult access to the plates and seals and, due to the structure of the internal gear output, a relatively small planetary step-up ratio.
The object of the invention is to avoid the abovementioned drawbacks and to provide a less expensive wheel hub with a direct multidisk brake and planetary gear mechanism so that it is of simple structure and easy to fit, a small size being desired which, at the same time, by means of a web output from the planetary gear mechanism, allows a large step-up ratio and, if appropriate, a two-stage planetary gear mechanism within the intended space.
With a wheel hub of the type described in the introduction, this object is achieved, according to the invention, by the fact that the brake carrier, together with the brake piston and its seals, the brake plates, a brake support ring and the internal gear, is designed as a first installation assembly, the internal gear being attached to this first installation assembly and the brake carrier having an internally arranged attachment flange which can be connected to the axle body via attachment elements for attaching the entire first installation assembly, and that the cup-shaped wheel hub, together with the planet gears and their bearings, is designed as a second installation assembly, this second installation assembly being designed in such a manner that it can be pushed over the first installation assembly, the cup-shaped wheel hub engaging in the outer plates of the brake.
It can be seen that this division of the wheel hub into two installation assemblies produces a wheel hub which is of simple structure and is easy to assemble, so that in particular there is also very good access to the plates of the brake, so that it is easy to establish the wear levels thereof. Moreover, in the design according to the invention, the sun pinion and the internal gear are mounted in such a manner that they can move in the radial direction to a limited extent. If, by way of example, one planetary gear were now to generate a greater moment than the other, the gearing forces would displace the internal gear and the sun pinion toward the planets which are under less load, so that the latter would take up a greater moment. This measure allows four or more planet gears to be used to good effect.
As can be seen, the wheel hub is particularly simple to assemble, and after the first installation assembly (brake carrier assembly) has been assembled, the second installation assembly can be fitted easily by being pushed over the first installation assembly with the wheel hub and then being attached. Dismantling can be carried out in the reverse order. The wheel hub as a whole therefore essentially comprises just two separate assemblies.
In an advantageous configuration, the internal gear is attached to the brake support ring, for example by means of a securing ring.
Furthermore, to form the second installation assembly, the planet carrier is formed by the bearing journal of the wheel hub, on which the planet gears are arranged.
In a further advantageous configuration, the brake carrier has a cup-shaped internal contour. As a result, there is additional space available inside the brake carrier.
This additional space can be used to particularly good effect by arranging a second planetary gear mechanism inside the cup-shaped internal contour of the brake carrier, the brake carrier forming the toothing of the internal gear of the second planetary gear mechanism. It is thus possible to produce a two-stage planetary gear mechanism within a given space without any problems.
As an alternative, it is also possible for the brake carrier, as its internal contour, to have only a single hole for installing the pinion.
To further simplify assembly, it is advantageous for the seals of the step-like brake piston to be arranged in circumferential grooves in the brake piston. This makes the seals simple to fit without any auxiliary tools being required.
Furthermore, assembly of the wheel hub can be simplified still further by making it possible to clamp the wheel bearings by means of the brake carrier via adjustment disks. It is then possible, in a simple manner, also to adjust the wheel bearings when assembling the first installation assembly containing the brake carrier.
REFERENCES:
patent: 4407382 (1983-10-01), Dziuba et al.
patent: 6135259 (2000-10-01), Forster
patent: 3832649 (1989-07-01), None
patent: 4439360 (1996-01-01), None
patent: 196 40 146 (1998-01-01), None
patent: 2 514 091 (1983-04-01), None
patent: 900326 (1962-07-01), None
patent: 1595713 (1981-08-01), None
Kohlmeier Dietmar
Meise Andreas
Wolff Friedrich
Bonck Rodney H.
O&K Orenstein & Koppel Aktiengesellschaft
Rosenman & Colin LLP
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