Bearings – Linear bearing – Roller bearing
Patent
1995-01-03
1995-12-12
Hannon, Thomas R.
Bearings
Linear bearing
Roller bearing
384 58, F16C 2904, F16C 2912
Patent
active
054743842
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention takes as its departure point a supporting bearing for linearly guided travelling units in accordance with the generic type of the main claim. In the case of supporting bearings of this generic type, which are used, in particular, in modular linear-guidance systems in industrial manufacturing and themselves form a module for such a system, which can be designed individually, the axial play of the roller, as well as the radial guidance play thereof, has to be eliminated before start-up of the travelling unit if the means for guiding the travelling unit are to be operated satisfactorily even after a relatively long operating period. In the case of known supporting bearings of the generic type, the housing is configured rigidly in one part and is provided, in order to receive the roller, with a cutout which is open towards one housing side and of which the two side walls at right angles with respect to the axis of the roller are spaced apart from one another by a non-changeable spacing which, due to the unavoidable manufacturing tolerances on the housing and the roller, usually results in axial play of the roller. In order to eliminate this, provision is made for a screw which is guided in the housing and butts, on a wedge surface, on the eccentric bolt and, by way of said surface, presses the eccentric bolt axially onto a fixed stop surface. In spite of the resulting fixing of the eccentric bolt, it is not ensured that the axial position of the rollers also remains unchanged because the latter may possibly also be displaced on the eccentric bolt in the event of relatively high axial forces occurring.
ADVANTAGES OF THE INVENTION
The arrangement, according to the invention, having the characterizing features of the main claim has the advantage that the axial position of the roller is fixed directly by way of its inner raceway and the eccentric bolt does not require an axial clamping surface. The two housing halves may be of the same construction, as a result of which the number of items manufactured is increased and production is rendered less expensive. The two bearing pins on the eccentric bolt may have the same diameter, with the result that, if appropriate, re-machining of the bearing bores in housing halves of the same construction is also dispensed with.
The features cited in the subclaims constitute advantageous developments of the arrangement according to the main claim.
In the case of a preferred embodiment, the housing halves can be clamped together by the screws serving to fasten the supporting bearing on the basic body of the travelling unit and are configured and/or dimensioned such that, at least on one housing half, the inner wall region located opposite the inner raceway of the roller is deformed inwards upon tightening of the screws by the torque prescribed for the final assembly. Consequently, the axial position of the roller is automatically fixed, without additional measures and means, upon fastening the supporting bearing on the basic body of the travelling unit. Here, the arrangement may advantageously be such that deformation of the housing, eliminating the axial play, only takes place when the fastening screws of the supporting bearing are tightened to a greater extent than is necessary for fixing the supporting bearing on the basic body, during radial adjustment of the rollers and subsequently fixing of the eccentric bolt in the adjusted position. The radial adjustment of the roller takes place, in this case, in a pre-assembly operation, while the axial play is eliminated during the following final-assembly operation.
The features cited in claims 3, 4 and 5 give a configuration, appropriate for manufacturing, of a supporting-bearing housing composed of two halves of the same construction.
In the case of supporting bearings having at least one dirt scraper which serves at the same time for lubrication purposes, consists of felt and is mounted in a displaceable and spring-loaded manner in a guide shaft of the housing, it is proposed that the dirt scraper be pro
REFERENCES:
patent: 2554299 (1951-05-01), Hammond
patent: 3504952 (1970-04-01), Farmer
patent: 4715730 (1987-12-01), Magnuson
patent: 5070575 (1991-12-01), Redman et al.
patent: 5340247 (1994-08-01), Cuneo et al.
Koban Johannes
Ludwig Peter
Hannon Thomas R.
Robert & Bosch GmbH
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