Bearings – Rotary bearing – Plain bearing
Patent
1985-06-20
1987-01-06
Levy, Stuart S.
Bearings
Rotary bearing
Plain bearing
384206, 403371, F16C 2500, F16C 2304, F16B 214
Patent
active
046342990
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an arrangement for an axle which is anchored at two points situated at the ends of the axle, preferably in mounting cheeks or the like with through-bores for the axle, by means of nuts which can be screwed on outside the fixing points, and which is designed to have a bearing mounted on a central cylindrical part, this bearing being fixed by means of spacer elements disposed on the axle, and bridging the distance between the respective fixing points and the bearing. The invention also relates to a method of mounting a bearing on an axle using the arrangement according to the invention.
The conventional way to achieve pivotability in a connection between two machine parts is to use a hinge journalled in bearings, comprising one or more bearings arranged on an axle which is fixed in between a pair of mounting cheeks or the like on one of the machine parts. The inner race of the bearing or bearings is disposed on the axle and, possibly with the aid of distancing rings, bridges the distance between the fixing cheeks, while the outer race of the bearing or bearings is effectively connected to the second machine part. Since relative movement between the inner bearing race and the axle produces progressively increasing wear resulting in excessive play and perhaps fracture of the axle, the race has to be fixed relative to the axle by means of nuts screwed onto the respective axle ends. It is important that the nuts are tightened just the right amount, since excessive tightening may jeopardize the attachment of the mounting cheeks, and excessive play may arise as a result of insufficient tightening, with the results mentioned above.
Hinges of this kind, journalled in bearings, are very common. As an example, reference is made to FIG. 1 on which the points where such bearing-mounted hinges occur are marked on an illustration of the hydraulic arm of a loading machine. The fixing of pulley wheels for a hoisting rope and the like can be regarded as a hinge mounted in bearings, and it will be appreciated what the results of the axle fracturing would be in this case. Even if the axle does not actually fracture, it is a laborious and costly process to renovate a bearing-mounted hinge to deal with wear and looseness.
The object of the present invention is to provide an arrangement for an axle for a bearing-mounted hinge by means of which very stable fixing of the inner race of the bearing can be obtained, thereby preventing the disadvantages described above.
This is made possible in that one of the spacer elements is disposed fixed relative to the cylindrical part of the axle, the arrangement comprises two expanding sleeves which can be inserted in the said through-bores and have inwardly or outwardly facing conical shaping, and the axle and/or the through-bores have corresponding conical shaping over a zone at the respective fixing points so that the respective expanding sleeves act as annular wedges with their apex pointing towards the cylindrical part, i.e. so that by means of associated nuts the respective expanding sleeves can be caused to expand against or be pressed together by the wall of the through-bore, thereby accomplishing the anchoring of the axle.
In order to achieve secure mounting of the axle relative to the mounting cheeks, according to the invention between the nut and the mounting cheek a sleeve is put on the axle end which is situated furthest away from the spacer element which is rigidly fixed on the axle, the dimensions of this sleeve being such that, without the associated expanding sleeve being influenced when the nut is tightened, it is braced against the mounting cheek so that the inner race of the bearing is thereby clamped between the fixed spacer element on one side and a spacer element on the other side, resting loosely against the mounting cheek and designed to fill the gap and eliminate looseness between the inner bearing race and the mounting cheek, the second axle end is then anchored by means of as associated expanding sleeve by tightening the associated n
REFERENCES:
patent: 1483282 (1924-02-01), Coston
patent: 1667610 (1928-04-01), Tewsley
patent: 3163474 (1964-12-01), Wilson
patent: 3347577 (1967-10-01), Carlson et al.
patent: 3432214 (1969-03-01), Cashman et al.
patent: 3841771 (1974-10-01), Shankwitz et al.
patent: 4022536 (1977-05-01), Piepho et al.
Hannon Thomas R.
Levy Stuart S.
Schaktfirma Broderna Svensson AB.
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