Bearings – Linear bearing – Plain bearings
Patent
1989-07-24
1991-05-07
Stodola, Daniel P.
Bearings
Linear bearing
Plain bearings
384 7, 384 41, 384 43, 384 57, 384 59, F16C 2304, F16C 2900, F16C 3300
Patent
active
050131630
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a linear unit comprising a spindle sleeve and bearing elements that support the sleeve for displacement in the unit housing. In such linear units, the spindle sleeve must be supported so as to be absolutely free from play in consideration of the required high positioning and repeating accuracy of the work cycles. In known linear units of the type, roller bearings with relatively large bearing rollers are arranged at both front ends of a tubular housing part, a plurality of these bearing rollers being adjustable in the radial direction for the purpose of eliminating bearing clearance or adjusting the spindle sleeve. This construction results in high cost of assembling the unit and requires relatively large space.
Summary of the Invention
The object of the invention is to provide a linear unit which is simple with respect to assembling, inexpensive and also economical with respect to space. The object of the invention is achieved by providing a linear unit in which the two bearing elements are constructed in such a way that they do not project out of the housing part. Errors of geometry and alignment in the housing part and spindle sleeve can be easily compensated for by means of the individually adjustable bearing elements.
A particularly compact construction results when every bearing element comprises a planar bearing surface and a plurality of bearing points which lie in a common bearing plane which encloses, with the imaginary axis of the cylindrical supporting surface of the bearing element, the same acute feed and wedge angles as the axis of the housing bore hole with the longitudinal axis of the spindle sleeve, wherein the bearing plane of the bearing element advantageously extends approximately along the entire length of the cylindrical supporting surface. This construction also has the additional advantage that the spindle sleeve can be guided over a longer axial area, so that, when the bearing elements are constructed so as to be correspondingly long, a single axial bearing area can also be sufficient if necessary.
The use of commercially available bearing bodies is possible if every bearing element comprises a guide segment, which is provided with the cylindrical supporting surface, and a bearing body which is constructed so as to be separate from the guide segment and which is inserted to fit in a receptacle of the guide segment and preferably connected with the latter so as to be detachable.
Optimum use is made of the wall of the housing bore hole receiving the two bearing elements for supporting the two guide segments of the bearing elements when the two bearing elements are defined in each instance by a shoulder surface at the longitudinal sides of their guide segments which face one another, the shoulder surface at least approximately enclosing an angle of 45.degree.with the bearing plane.
In another embodiment of the invention it is suggested that localized recesses are provided in the supporting surfaces of the bearing elements and, in a manner corresponding to the latter, in the wall of the housing bore hole, which recesses form hollow spaces which open toward the outer front side of the bearing element and contain a filling material, which is inserted after the adjustment of the bearing elements, for fixing the bearing elements between the housing part and the spindle sleeve in a positive-locking manner and so as to be free from play. A curable plastics material can advantageously serve as filling material. It is accordingly achieved that fastening elements in the form of pins, screws or the like are dispensed with and the bearing elements are fixed in the adjusted position so as to be absolutely free from play and resistant to shaking.
The localized recesses in the wall of the housing bore hole and in the bearing elements which receive the filling material can be advantageously constructed without radial undercuts, so that the bearing elements can be removed from the housing bore holes in the radial direction after removing the sp
REFERENCES:
patent: 3552806 (1971-01-01), Weasler et al.
patent: 3591906 (1971-07-01), Leiber
patent: 4515415 (1985-05-01), Szenger
patent: 4730945 (1988-03-01), Luther et al.
Gosdowski Gerhard
Rappold Roland
Battista, Jr. William G.
Robert & Bosch GmbH
Stodola Daniel P.
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