Bearings – Linear bearing – Roller bearing
Patent
1995-11-06
1996-09-10
Hannon, Thomas R.
Bearings
Linear bearing
Roller bearing
104107, 384 50, F16C 2900, B61B 300
Patent
active
055539475
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a guide rail for railborne load carriers comprising a support made as an extruded hollow profile and at least one running rail arranged in a groove of the support, a cavity of the support being divided into a lower and an upper chamber by a cross-web, while an outer wall of the lower chamber extends parallel to the cross-web.
A guide rail of this type is known from EP-B-0 213 160 and comprises two parallel running rails mounted and fixed in parallel grooves of the support which are open towards the outside. These running rails constitute raceways for rolling elements of a load carrier in the form of a carriage mounted slidably on the guide rail. The support in the case of this known guide rail is a solid component so that a considerable amount of material is required for its manufacture. In the majority of uses, however, the rigidity offerred by solid guide rails is not required, or the guide rail can be supported along its entire length so that reduced geometric moments of inertia do not have a negative effect.
CH-PS 557 483 discloses a device for the linear guidance of a machine component comprising a guide rail of a hollow configuration. For this purpose, an I-shaped support is surrounded by two profiled sheets of a particular shape resulting in the formation of two cavities adjacent to the profiled support. Two ball raceways are formed on the outer surface of each of these profiled sheets so that the sheets constitute a part of a linear rolling bearing. Such guide rails have the disadvantage that the special configuration of the I-shaped support on both sides of its length and, above all, the complicated shape of the profiled sheets makes it very expensive to manufacture.
A guide rail of the type initially mentioned is known from the document DE-U-90 11 413. The support used therein comprises undercut longitudinal grooves for lodging running rails. Access to these longitudinal grooves is from the inside of the upper chamber. In the region of each of these longitudinal grooves for lodging running rails, there is provided in the support, another longitudinal groove which is accessible from the outside and serves to connect the support to other parts of the structure. These grooves therefore have to be precisely dimensioned. In a transverse cross-section, this support has a substantially U-shaped configuration with the arms of the U extending upwards from the horizontal crossbar. The upper chamber of this support is therefore only closed on three sides and the fourth or upper side comprises a longitudinal slot. This support therefore does not possess the high rigidity of a closed hollow profile.
It is an object of the invention to provide a simple-to-manufacture guide rail for railborne load carriers and to configure the guide rail so that material requirement is reduced.
The invention achieves this object by the fact that the upper chamber adjacent to the groove of the support is closed by a further outer wall of the support, which wall extends parallel to the cross-web. This upper chamber adjacent to the groove of the support can cooperate with a groove bottom of the groove to absorb a part of the plastic deformation taking place during calibration.
A specially configured groove bottom of the two grooves in the guide rail for lodging the running rails permits calibration and thus also economic chipless manufacturing. Due to the cavities or chambers in the calibration region, the extrusion molding manufacturing tolerance zone of the support can be calibrated to the required size, the hollow profile permitting a very high degree of plastic deformation of the support. The plastic deformation of the material of the support caused by the calibrating operation permits the running rails to extend at an exactly constant distance from each other in the grooves of the previously calibrated support along the entire length of the guide rail. If the running rails are rolled into the grooves, they have such a small tolerance range that the carriage (load carrier) for this system can be made wit
REFERENCES:
patent: 4520733 (1985-06-01), Willmann
patent: 4545881 (1897-04-01), Goedecke et al.
patent: 4722150 (1988-02-01), Jacobs et al.
patent: 4776282 (1988-10-01), Ishikura et al.
patent: 5211279 (1993-05-01), Abbestam et al.
Brunk Michael
Kleber Rainer
Scheib Frank
Hannon Thomas R.
INA Walzlager Schaeffler KG
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