Joints and connections – Interfitted members – Radially interposed shim or bushing
Patent
1982-06-17
1984-12-04
Kundrat, Andrew V.
Joints and connections
Interfitted members
Radially interposed shim or bushing
403351, 403374, 292349, B25G 320
Patent
active
044861168
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns a friction joint for fixing a first machine element to a second machine element, said friction joint being established with the aid of at least one sleeve-like member so that said sleeve-like member has been disposed around said first machine element, and that said second machine element has been disposed to receive said sleeve-like element.
For integral joining between a shaft and a hub, a keyway and a simple uniform key have long been applied. As a consequence of better materials and more accurate manufacturing procedures, a friction joint of this type is too coarse nowadays.
The following characteristics, among others, are required of ideal tightenable joints. The shaft and the central hub hole must be completely cylindrical. The tolerances and surface quality requirements of the force-transmitting joint must be reasonable. The joint must retain the original centering. It must be possible to separate and reestablish the joint several times. Axial displacement of the joint should be easy to accomplish. Establishing of the joint should not require the use of special tools. The direction of torque (driving vs. driven) must be changeable in a force-transmitting joint. The friction joint should not necessitate the use of securing keys and the like, whereby economy in shaft thickness becomes possible.
The characteristics listed above are not achievable with a conventional key joint, and the key joint is therefore a rather unsatisfactory solution.
For the purpose of establishing a friction joint, the so-called ETP sleeve has recently been developed, by the aid of which it is possible to mount on a shaft elements such as sprocket wheels, belt pulleys, gear wheels, clutches, cams, flywheels, rolls, levers, cutting disks, etc. A sleeve of this type replaces the conventional joint constructions previously applied, such as keyways, rifling, splining, set screws, welded, cone, tightening and crimp joints, etc. The ETP sleeve expands against the two surfaces which are meant to transmit the torque. This expansion is achieved by means of a pressure fluid applied between the inner and outer walls of the sleeve. The pressure fluid is acted upon by a pressure ring, which is tightened by means of common hex head screws. Although by this design a number of remarkable advantages are gained, its greatest drawback are its scaling problems. It is also a fact that the ETP sleeve comprises a great number of components and this solution is therefore comparatively complex.
SUMMARY OF THE INVENTION
The object of the invention is to achieve an improvement of friction joints known in the art. The more detailed object of the invention is to provide a friction joint in which sealing problems have been totally avoided. A further object of the invention is to provide a friction joint which is as simple as possible in its construction but which is nevertheless reliable in operation. The other objects of the invention and the advantages obtained thereby will be apparent from the disclosure of the invention.
The objects of the invention are achieved by means of a friction joint mainly characterized in that it includes a sleeve-like member which is tiltable by means of a tilting device, through a certain angle, whereby the inner surface of the sleeve-like member creates an interlocking with the first machine element and, in like manner, the outer surface of the sleeve-like member creates an interlocking with the second machine element.
Other features of the friction joint of the invention are recited in the claims following this specification.
The remarkable advantages obtained by the friction joint of the invention, compared with the ETP sleeve, include the following. The torque transmitted by the friction joint can be regulated, whereby the friction joint may also be applied as an over-load clutch. It is possible in the friction joint of the invention to make the friction ring, shaft and hub of one and the same material, whereby temperature variations cause no variations in the
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patent: 556587 (1896-03-01), Noack
patent: 2798748 (1957-07-01), Maurer
patent: 2805873 (1957-09-01), Brennan et al.
patent: 2888284 (1959-05-01), Holmberg
patent: 3334931 (1967-08-01), Holt et al.
patent: 3884508 (1975-05-01), Jones
Konejukka Oy
Kundrat Andrew V.
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