192 clutches and power-stop control – Clutches – Axially engaging
Patent
1984-05-18
1986-03-18
Schwartz, Larry I.
192 clutches and power-stop control
Clutches
Axially engaging
1921062, 464 67, F16D 366
Patent
active
045762678
DESCRIPTION:
BRIEF SUMMARY
The present invention is generally concerned with a centrifugal actuator device of the kind comprising at least one actuator member of generally curved shape so that it may be positioned along a circumferential track on a rotary member, being coupled thereto by the engagement of a slot over a radial lug of the track extended by a retaining tab which is at least partially cantilevered. It applies in particular to torsional damper devices, in particular for clutch disk assemblies, in which two rotating parts are rotationally coupled in such a way as to disable circumferentially acting elastic means.
Coupling or locking devices of this kind are already known through applications EPO No. 015 203A1 and EPO No. 015 204 A1 in particular, filed in the name of this applicant. These documents put forward various locking devices, in slightly different contexts; one in particular comprises, carried by radially opposed tracks disposed on the periphery of the two rotating parts, chamfered axial bearing rims in the case of that of the two parts which is on the outside in the radial direction, and elastically deformable arms in the case of the other part, extending circumferentially and which, on the one hand, carry a hooking member, such as a tang, which is adapted to cooperate with said bearing rims above a limiting rotation speed determined by the elasticity of said arm, whilst being on the other hand rigidly attached, at a distance from said tang, to that of the two parts which is on the inside in the radial direction by virtue of the interference fit engagement without radial or circumferential play of a slot over a radial lug extended by a retaining tab which extends circumferentially and in part cantilever fashion from said lug, having a circumferential extent substantially equal to that of said lug.
Although applying to different torsional damper devices, this particular method of disabling part of the circumferentially acting damper elastic means present in both cases has the same serious disadvantage, associated with the problems of reconciling a radial return function of the elastically deformable arms opposing centrifugal forces and a circumferential coupling function operative between the rotating parts in the coupled or locked position. Given the interference fit engagement contributing to the circumferential coupling for the purposes of the radial return function and for the corresponding sensitivity to centrifugal force, the arm must be provided with a counterweight, for which there is not sufficient room, however, unless the surrounding components are modified. Consequently, it seems that implementing the circumferential coupling function results in dimensions for the arm such that its centrifugal lifting off movement from the internal track towards the bearing rims of the external track is achieved only for speeds above 1 700 rpm, much too high in practice.
The objective of the present invention is to overcome this disadvantage and to this end the present invention proposes to dissociate the aforementioned two functions of the arm, by mounting the arm on a lug and a retaining tab of the aforementioned kind, but providing radial and circumferential play sufficient to permit said arm to tilt around said lug in a substantially unrestricted manner, an external return member, adjustable at will, being associated with it so as to cause it to lift off in response to centrifugal force from a speed of 1 200 rpm, for example.
The improvement constituted by an arrangement of this kind is adaptable to the torsional damper devices described in the aforementioned applications; more generally, it is applicable in all cases of intervention by any centrifugal actuator member, whether to bring about locking, electrical contact or any other function.
It is for this reason that the present invention is very generally concerned with a centrifugal actuator device of the kind comprising at least one actuator member of generally curved shape so that it may be positioned along a circumferential track on a rotary member, being co
REFERENCES:
patent: 4157136 (1979-06-01), Salle
patent: 4376477 (1983-03-01), Loizeau
Brown Charles A.
Brown Charles E.
Schwartz Larry I.
Valeo
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