192 clutches and power-stop control – Clutches – Axially engaging
Patent
1990-03-05
1991-02-05
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Axially engaging
192 7016, F16D 1368, F16D 1352
Patent
active
049897080
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a multi-disk friction clutch having an outer body with grooves for the guiding of external disks by means of their toothing, as well as having a hub body with grooves for the guiding of internal disks by means of their toothing, the external and internal disks resting in and against their guides with play. Such a clutch is disclosed, for example, in DE-PS 26 01 507.
In the case of the multi-disk friction clutch disclosed in the initially mentioned text, the toothings of the external and internal disks, which engage in grooves of an outer body and of a hub body of the clutch, are constructed to be V-shaped and have teeth which taper toward the tip of the tooth. For tolerance reasons and because, when the clutch is operated, the axial shifting of the disks must take place while the displacement resistance is low, a sufficient radial play of the disks must be provided which ensures the axial shiftability of the disks also in the case of occurring strong temperature fluctuations and small oblique positions. In the released condition of the clutch, thus when the external and internal disks are at an axial distance from one another, an uncontrolled wobbling of the disks is observed. The reason is that, because of a force acting in the center of gravity and because of the gap between a disk and its guide when the support is instable, individual external disks take up an inclined position and push against the oppositely rotating internal disks. In order to achieve a clean separation of the disks while the clutch is released, it was suggested to provide spacing elements between the disks which keep the disks apart. Nevertheless, even this measure, does not always ensure that the desired parallel position of the disks is obtained.
The invention is based on the object of preventing the wobbling of the disks.
In the case of a device of the mentioned type, this object is achieved according to preferred embodiments of the invention by providing an arrangement characterized in that the teeth of the external disks are constructed with undercut tooth profiles, in that the grooves in the outer body have corresponding undercuts, and in that the external disks are constructed such that, when the external disks are arranged centrically in the outer body, the gap between the external disks and the outer body at the tooth profiles caused by the play is smaller than at the other points of the outer contour of the external disks. Because of asymmetries, resulting centrifugal forces which are applied to the center of gravity affect the rotating external disks. Because of the required gap between the external disks and their guide in the outer body, the external disks, when the clutch is released, under the effect of these forces, slide into a slightly eccentric position in which they are supported in their guide. In this case, if the support is unstable, as in the state of the art, the external disks would tilt and therefore take up an undesirable oblique position. An unstable support exists when the supporting points at the disks, viewed in the direction of the force or the shifting, are located behind the point of application of force or the center of gravity. When the support is unstable, a slightly oblique position causes a tilting moment which increases the oblique position. When the teeth of the external disk are constructed with undercut tooth profiles according to the invention, a stable "suspended" support of the external disk is achieved. When disks take up an oblique position, a resetting moment occurs which cancels the oblique position. The supporting of the external disks takes place at tooth profiles of teeth which, viewed in force direction, are located in front of the center of gravity of the disks. The reason is that, for geometrical reasons, tooth profiles which are in a normal position with respect to the force direction or shifting direction come to rest in the guide at the outer body earlier than tooth profiles disposed obliquely with respect to it or other edges of the contour of the e
REFERENCES:
patent: 1328022 (1920-01-01), Watson
patent: 3621945 (1971-11-01), Spry
patent: 3841452 (1974-10-01), Newsock et al.
patent: 4534457 (1985-08-01), Eltze et al.
Bonck Rodney H.
MTU Friedrichshafen GmbH
Pitts Andrea
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