Clamping member free-wheel with at least one plastic cage ring

Details Clamping member free-wheel with at least one plastic cage ring Clamping member free-wheel with at least one plastic cage ring

1992-07-06

1994-08-09

Braun, Leslie A.

192 clutches and power-stop control

Clutches

Automatic

192 41A, F16D 4107

Patent

active

053357612

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention concerns a clamping element free-wheel with an inner ring and an outer ring, with basically bone-shaped clamping elements arranged between the rings that have a outer radial thickening, a central waist and an inner radial thickening, and with a cage ring arranged on the height of the inner radial thickening of the clamping elements which guides the same in a synchronous manner and consists of two cage ring segments that have an axial distance to each other and axial webs that connect the cage ring segments between which pockets for the clamping elements are formed.
A free-wheel of this sort with one single cage ring is known from U.S. Pat. No. 2,753,027. Free-wheels with double cages that are provided with a cage ring of the mentioned sort as inner cage ring are described in DE-A-27 58 841 and U.S. Pat. No. 4,998,605. In the double cage variation according to FIG. 5 in U.S. Pat. No. 4,998,605, the flexible tongues that impinge on the clamping elements are molded onto the webs of the inner cage ring which consists of plastic. The flexible tongues can be easily damaged when a rebound of the clamping element ("popping") caused by an overload occurs. The earlier inventions do not counter the rebounding of clamping elements between the cage rings resulting in jamming ("pop-out"), which is also caused by an overload. In DE-A-27 58 841 and the variation according to FIG. 6 in U.S. Pat. No. 4,998,605, the webs of the inner cage ring have a radial thickness which is too minute to provide an effective pop-out protection.
The invention is based on the objective of creating a clamping element free-wheel of the initially mentioned kind that provides increased protection against a rebound of the clamping elements ("popping") caused by an overload and a possible jamming ("pop-out") of rebounding ("popping") clamping elements caused by an overload.


SUMMARY OF THE INVENTION

This objective is attained with a clamping element free-wheel of this sort by the fact that the cage ring consists of a viscoplastic plastic material, in particular an elastomer, and that its webs have a radial thickness that generally corresponds with one of the inner thickening of the clamping elements at least on the side impinged on by the clamping element during a rebound of a clamping element ("popping") caused by an overload.
The advances in plastic technology offer the possibility of manufacturing cage rings at low tool and operational costs which provide exceptional security against a rebounding of the clamping elements ("popping") caused by an overload thanks to minute tolerances in the width of the pockets and the spacing and centering. A viscoelastic plastic material is particularly suitable as the material for the cage ring. Should particularly disadvantageous operation conditions, such as for example torsional oscillations, oil contamination and the associated reduced frictional value, already present flattenings on the clamping elements surfaces caused by the wear and tear of the free-wheel and so forth, lead to a rebound and a subsequent impact of the clamping elements on the webs of the cage ring, the webs absorb the impact in an elastic manner. The clamping element is promptly returned into the engagement position in a spring-like manner and no permanent deformation occurs on the webs. The massive radial thickness of the webs, at least on the side impinged on by the rebounding clamping elements where the frontal surface of the webs can, for example, be radially raised, effectively prevents the pop-out of clamping elements and thus makes the cage ring exceptionally robust, so that no damage occurs, even with repeated popping occurrences. A simple removal from a plastic injection molding tool can be ensured with thick clamping elements or at least the side impinged on by the rebounding clamping element, for example by construction of thicker webs with a radially raised frontal surfaces.
The cage ring constructed according to the invention can represent the only cage ring of a clamping element

REFERENCES:
patent: 2753027 (1956-07-01), Troendly et al.
patent: 2824635 (1958-02-01), Troendly et al.
patent: 3219163 (1965-11-01), Zlotek
patent: 4114739 (1978-09-01), Colonna et al.
patent: 4252221 (1981-02-01), Lanzerath et al.
patent: 4327822 (1982-05-01), Vogele et al.
patent: 4347920 (1982-09-01), Bordes
patent: 4998605 (1991-03-01), Ferris

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