192 clutches and power-stop control – Clutches – Axially engaging
Reexamination Certificate
1999-08-04
2001-05-15
Marmor, Charles A (Department: 3681)
192 clutches and power-stop control
Clutches
Axially engaging
C192S10900B
Reexamination Certificate
active
06230865
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to friction clutches, and more particularly to a hub for a friction clutch with at least one clutch plate, which can be used in the drive train of a motor vehicle.
2. Description of the Related Art
Such a hub is known, for example, from U.S. Pat. No. 4,846,326. The hub of this clutch comprises a disk which is provided with axially projecting webs on both sides. A suitable mating contour in the clutch plates allows them to be pushed onto the hub centrally on both sides. The abovementioned disc thus serves as a stop for the clutch plates. Since the webs have to be machined out of the solid material on both sides, the hub can only be produced with a high level of manufacturing outlay.
SUMMARY OF THE INVENTION
An object of the present invention is therefore to provide a hub for a friction clutch which is easier and less expensive to produce.
This and other objects of the invention are achieved by arranging a stop device on the hubs in the radially outer area of the guide devices and the toothing which is axially continuous. It is thus possible to produce the guide devices and the stop devices in a single working step and from one side, for example by milling or erosion, thus making it possible to reduce production time and outlay and therefore costs.
An advantageous configuration consists in at least two guide devices being of essentially identical form. Also, the use of a multiplicity of guide devices provides an advantage with regard to torque transmission, and prevents the clutch plate(s) from becoming tilted. The guide devices are preferably arranged on the outer circumference of the hub in the form of a circle around the axis of rotation, and are distributed around the axis at equal angular distances.
Furthermore, it may be advantageous to provide at least two identical stop devices. If necessary, the load-bearing capacity of the hub can be increased by using a multiplicity of stop devices. The stop devices are preferably arranged directly in the radially outer area of the guide devices. For reasons of symmetry, an annular arrangement or an arrangement at equal angular distances may be provided. In one embodiment, the stop device comprises a continuous ring.
According to an embodiment of the invention, the hub is produced using, a hub blank with a continuously encircling collar for the stop device. By removing the areas radially inside the collar, the guide device and the stop device are simultaneously manufactured on both sides. In this case, and in order to produce an adjacent guide device or stop device without the tool having to be removed from the blank, it is advantageous to cut through the collar or a guide device during machining. This is advantageous in particular for manufacturing by wire EDM.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, and specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
REFERENCES:
patent: 4846326 (1989-07-01), Tilton et al.
patent: 5638932 (1997-06-01), Mizukami
patent: 5975269 (1999-11-01), Kosumi et al.
patent: 6070707 (2000-06-01), Hofmann et al.
patent: 3321659 A1 (1983-12-01), None
patent: 4003076 C2 (1991-08-01), None
patent: 1407102 (1975-09-01), None
patent: 2 300 679 (1996-11-01), None
patent: 2 301 156 (1996-11-01), None
patent: 2 313 421 (1997-11-01), None
patent: WO91/14878 (1991-10-01), None
Hofmann Klaus
Pfeuffer Wilfried
Unsleber Elmar
Cohen & Pontani, Lieberman & Pavane
Marmor Charles A
Rodriguez Saul
Sachs Race Engineering GmbH
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