Joints and connections – Interfitted members – Radially interposed shim or bushing
Patent
1985-05-21
1988-02-23
Kundrat, Andrew V.
Joints and connections
Interfitted members
Radially interposed shim or bushing
403370, 403371, B25G 310, F16B 222
Patent
active
047267046
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to an annular clamping member adapted, for example, to grip a shaft, or, after distension to abut an inner annular surface, which has a circumferential length changeable by mutual axial displacement of its parts which are evenly distributed alternately to two opposite radial faces in opposite directions away from their positions when the clamping member is unlocked.
DESCRIPTION OF PRIOR DISCLOSURES
A clamping member of this type is known, for example, from Russian Patent specification No. 826,118 which describes a clamping member consisting of a flat, relatively thin spring ring having alternately on its two faces, evenly distributed protruding parts. This ring is adapted to be inserted between an end face of an element arranged on a shaft and an abutment ring axially displaceable towards said end face. Such a displacement of the abutment ring will result in the protruding parts being pressed axially in opposite directions, whereby the ring is given a zigzag shape causing a reduction of its circumferential length and, consequently, of its inner and outer diameters, thus causing the ring to lock upon the shaft. To sufficiently reduce the ring's inner diameter, it is necessary, however, even if for a reduction of diameter of only a fraction of one mm, to subject the ring to an axial deformation of many times its thickness. This is because the ring portions slanting relative to radial planes and formed by deformation have to form an angle to the radial planes of between 10.degree. and 15.degree.. Such a strong deformation severely stresses the material of the spring ring. Any additional deformations have to be avoided if the radial pressures against the shaft obtained by the deformation have to be sustained. Therefore, the ring has to be relatively thin. This limits radial pressures against the shaft it is possible to obtain, since owing to the radial pressures the elastic deformations of the ring material will again reduce the pressures. Accordingly, this prior art device is suitable only for use in small machineries wherein only minor torques have to be transmitted.
FEATURES AND ADVANTAGES OF THE INVENTION
The annular clamping member according to the present invention comprises two sets of sections, a primary and a secondary section alternately arranged at its two opposite axially facing ends, each of which sections is interconnected with the two adjacent sections of the other set by means of ring portions slanted relative to radial planes whose slope can be varied by a forced axial displacement of the two sets of sections relative to each other. Because of the slope of the ring portions relative to the axial direction, and provided the angle with the radial planes is greater than 15.degree., preferably between 20.degree. and 45.degree., even a small mutual axial displacement of the two sets of sections will result in a relatively large change in the circumferential length of the inner as well as of the outer periphery of the clamping member. Further, it is possible to obtain a diameter reduction, for example to use the clamping of the member on a shaft, as well as a diameter increase, for example to use the member within a hub bore. This is because a diameter reduction is obtained, when the sections of the two sets are drawn in opposite directions, and a diameter increase is obtained when the two sets of sections are urged against each other. Further, since the unavoidable deformations of the parts are small, no greater demands on the yielding ability of the material used may be made, the clamping members may be given a relatively great axial dimension and/or be made from relatively thick material. As a result improved radial contact pressures between the clamping member and a shaft or a surrounding wall may be obtained making the clamping member useful even where strong torque effects are to be transferred. Moreover, the clamping member can be made from any solid material including wood and cast iron.
A further advantage of the clamping member according
REFERENCES:
patent: 3112116 (1963-11-01), Seitz
patent: 3578364 (1971-05-01), Ehrenberg
patent: 3995967 (1976-12-01), Haller
Derwent's abstract No. B 7199 E/07, SU 826 118 (Gear Cons. Res. Inst.), May 10, 1981.
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