192 clutches and power-stop control – Clutches – Automatic
Patent
1993-01-19
1994-09-06
Pitts, Andrea L.
192 clutches and power-stop control
Clutches
Automatic
192 41A, 192 43, 192 47, 192 93C, 188 822, F16D 1500, F16D 4108
Patent
active
053439929
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a switchable freewheel with locking elements according to the generic part of claim 1.
A freewheel with locking elements which is operable in both directions is indeed known from EP-A-0 182 994 but in this case, two freewheels disposed adjacent to each other and acting in opposite directions are used. Switching-free is effected radially by a frictional locking of the two freewheels and by elastic deformation of the running face diameter. This type of switching-free or switching-over mechanism is of a very complex nature and not easy to control.
The object of the invention is therefore to configure the freewheel of the initially cited type so that operation in both directions can be achieved by simple switchover facilities with the simplest possible construction and the smallest possible overall dimensions.
The invention achieves this object by the fact that the relative movement of the two cage rings serving to switch the freewheel is an axial displacement. For axially displacing the two cage rings, at least one of these rings can comprise a facility which can be made to cooperate with a surface which is inclined relative to the freewheel axis, which fact can be put to use if need be to convert the axial movement of the cage rings into a relative rotation thereof.
In an advantageous manner, it is also possible to make one of the cage rings of individual segments, each of these individual segments being disposed between circumferentially adjacent locking elements.
In particular, it is possible to arrange the inclined surface on one of the two cage rings and to arrange the faciltiy, likewise designed as a surface inclined with respect to the freewheel axis, on the other cage ring. This offers the possibility of a particularly simple embodiment in which the two inclined surfaces of the two cage rings from a sliding assembly comprising a groove on one cage ring and a spring on the other cage ring.
A particularly favourable embodiment can be obtained by making the inclined surfaces of the previous embodiment in the form of mutually contacting, spatially curved or helical surfaces in a form-fitting or frictional locking relationship to each other. The advantage of this design is the enlargement of the supporting portion of the surfaces.
Alternatively, it is possible that the facility be constituted by the radial edge of an axial cutout made in one of the page rings and facing a locking element pocket, or by a spatially curved surface of the axial cutout while the inclined surface is a surface of a tapered projection which is tapered in the axial direction and arranged on the end of a locking element facing the axial cutout. In this case, it is particularly advantageous to provide a second axial cutout facing a locking element pocket and comprising a facility in the form of a radial edge, and a second axially tapered projection on the end of a locking element facing the second axial cutout. In such a configuration, the first axial cutout and its associated facility serve for switching in one direction while the second axial cutout and its associated facility serve for switching in the other direction.
Based on this embodiment, two further alternative developments are possible, viz., firstly, that both axial cutouts are arranged on one and the same ring but on different sides with respect to the locking elements, and the two tapered projections are disposed on different axial ends of the locking elements, the second possibility being to arrange the two axial cutouts circumferentially offset with respect to each other on different cage rings, and to arrange the two tapered projections on the same axial ends of the locking elements. Both alternatives have the advantage of very small overall dimensions while being of an extremely simple construction.
Finally it is possible to provide a spring between the two cage rings which acts on these in the axial direction and by which the freewheel can be switched from one of its two switched positions into the freewheeling position, or from one switched
REFERENCES:
patent: 2001668 (1935-05-01), Maier
patent: 2113512 (1938-04-01), Kesterton
patent: 2991861 (1961-07-01), Von Thuengen
patent: 3008559 (1961-11-01), Forster
patent: 3017964 (1962-01-01), Von Theungen
patent: 3976175 (1976-08-01), Herbert
patent: 4635771 (1987-01-01), Shoji et al.
patent: 4875564 (1989-10-01), Leitz et al.
Copy of vol. 117 (M-381) (1849) May 22, 1985.
Copy of Japanese Article No. 60-4630, Jan. 1985.
Copy of Search Report.
Ritter Joachim
Stark Johann
Ina Walalager Schaeffler KG
Pitts Andrea L.
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