Bearings – Rotary bearing – Antifriction bearing
Patent
1992-05-06
1993-05-04
Footland, Lenard A.
Bearings
Rotary bearing
Antifriction bearing
384512, 384518, 384519, 384537, F16C 3506
Patent
active
052075141
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a mounting for disk spindles, particularly to two angle ball bearings clamped spaced apart on a shaft, a nd particularly to minimizing the effect of non-parallel alignment of the outer ring races of the bearings a bearing.
Mountings for disk spindles have been known and used for many years (see, for instance, SKF Kugellagerzeitschrift 232, 4/1988). Up to now embodiments have always been selected in which two deep-groove ball bearings or two angular ball bearings are arranged on the shaft at a certain distance apart and are clamped axially with respect to each other so that the desired freedom from play is obtained. Since smaller disks and disks of higher storage capacity are constantly being developed, it has been necessary to increase the precision of the mountings. Therefore, the bearings of the spindles were improved by, for instance, by including fewer structural parts and/or having fewer fitting and joining surfaces also. One improvement was that special inner rings were avoided by arranging the travel path of the balls directly in the shaft. Assembly-produced tilting with respect to each other of the inner-ring races was thereby excluded. The parallel alignment of the outer-ring races is also a prerequisite for optimal rolling conditions in the bearing. However, because of the tolerances in the fitting and joining surfaces of the outer rings, completely parallel alignment of the outer-ring races with respect to each other cannot be achieved. This has produced variations in the pressure angle in the circumference of the race which have a negative effect on the rolling conditions and thus on the precision of the mounting.
The object of the invention is to develop the aforementioned bearings so as to obtain high precision despite simple construction and simple assembly of the bearings.
The two bearings, which are clamped axially with respect to each other, are similar to two angular contact ball bearings. However, due to the fact that their races form sections of spherical surfaces with the center point on the axis of rotation, tilting of the outer rings with respect to each other is possible without variations in pressure angle occurring around the circumferential direction of the race. This is an important condition for high precision of the bearing. Due to the fact that the resultant pressing force of the compression spring does not act concentrically to the outer rings, the outer rings tilt in the bore of the sleeve.
If the distance between one axial end surface of the outer ring and the point of intersection of the pressure line of the bearing balls on the axis of rotation is made the same size as the distance between that point of intersection and the other end surface of the bearing, self-centering of the longitudinal axis of the bearing in the bore of the sleeve is obtained. Thus, the slot width between the outer rings and the sleeve has no effect on the central seating of the outer rings in the bore of the sleeve. The manufacturing tolerances for the sleeve bore and outer-ring diameter can be larger. The gaps produced between the outer rings and the sleeve bore are then filled with an adhesive which hardens. In this way, movements between the outer rings and the sleeve are avoided.
Despite obtaining maximum precision of the bearing, parallel alignment of the outer rings to each other and centering of the outer rings in the bore of the sleeve is therefore no longer necessary here.
BRIEF DESCRIPTION OF THE DRAWING
The invention will be explained further with reference to the drawing which is a longitudinal section through the mounting of a disk spindle.
Referring to the drawing, the mounting comprises a shaft in which there are worked the inner races 2 for two angle ball bearings, each bearing comprising a row of balls 3, of the outer ring 4 for the row of balls and a sleeve 5 around the outer ring. Between the outer rings 4, which are spaced apart from each other, there is a compression spring 6 which clamps the outer rings axially with respect to each other a
REFERENCES:
patent: 2919942 (1960-01-01), Bechtel
patent: 4969754 (1990-11-01), Rohrer et al.
FAG Kugelfischer Georg Schafer (KGaA)
Footland Lenard A.
LandOfFree
Mounting, in particular for disk spindles does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Mounting, in particular for disk spindles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mounting, in particular for disk spindles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1970793