DE8029743U1 - Rolling bearings for longitudinal movements - Google Patents

Description

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SKF KUGELLAGERFABRIKEN GMBH Schweinfurt, October 24th, 1980

DE 80 056 DE TPA.ko.tr

Rolling bearings for longitudinal movements

The innovation relates to a roller bearing for longitudinal movements on a shaft, in which at least one axially extending Raceway is incorporated, consisting of an outer sleeve with raceways running axially in the bore, in which the rolling elements are arranged from endless rows of rolling elements distributed around the circumference and from an in The outer sleeve built-in cage for guiding the rolling elements, the outer sleeve at least one axially extending Has slot, in the area of which the endless row of rolling elements engaging in the raceway of the shaft is arranged.

A roller bearing for longitudinal movements of this type is already proposed in DE-OS 2,834,209. This is with one wide, axially and radially continuous slot in which a specially designed, separate intermediate piece is installed, the endless row of rolling elements in

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engages an axially extending raceway. Although with this version the task of torque transmission is solved satisfactorily, the production is very expensive.

Furthermore, from DE-OS 2 849 758 torque ball bushings are known in which the loaded track section the outer sleeve can be moved radially by one or two rows of balls with an adjusting screw can. A particular disadvantage of this design is that only some of the in principle endless Track and thereby only part of the row of balls in question is moved, while the remaining balls and track parts remain in place. This does not guarantee that the balls in the entire adjustment range precisely guided can run into the loaded raceway groove or run out of it, whereby Wear and loud noise occur at the transition points, the linear bushing can fail prematurely or in principle, a lower average service life must be expected.

The task of the innovation is to create a rolling bearing for longitudinal movements of the type mentioned, which is used for transmission of torque no specially designed, separate intermediate piece is required and the The raceway of the torque-loaded rows of rolling elements is not changed during the radial adjustment.

The object is achieved in that the slot of the outer sleeve is a narrow, axially continuous separating slot is carried out that the rolling elements of the end

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loose rows of rolling elements leading cage (2) also the rolling elements the endless row of rolling elements (3) to transmit the torque and in the area of the separating slots cohesive, a mutual radial displacement of the cage ends allowing connecting elements and that the entire row of rolling elements adjacent to the respective separating slot is attached to the axially extending raceway the shaft is arranged so that it can be adjusted radially.

The rolling bearing for longitudinal movements has at least one, preferably two, on both sides of a row of rolling elements arranged, axially continuous slots. These are made very narrow, so that the even spacing the rows of rolling elements does not have to be changed compared to a non-slotted version. That between two Separating slots arranged segment is fully formed and exists, as with any other row of rolling elements from the part of the outer sleeve with raceways for the load zone, the return and the deflection of the rolling elements and from a cage part. Advantageously, the entire segment of the roller bearing for adjustment to the Raceway of the shaft and for the purpose of torque transmission are shifted radially. In the entire adjustment range all components of the segment remain in their position relative to one another, so that the running properties are as good as those of the rest of the rolling bearing. So that the compact shape is retained are in the area of the dividing slots Fasteners attached to prevent the individual parts from falling apart. These are but designed so that the radial displacement of the segment is only slightly hindered. When installed can be radial through one or more in the housing

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arranged screws or the like. The shift and thus the employment can be carried out. If for certain Applications a small radial displacement is sufficient, a single separating slot can be sufficient, with one of the row of rolling elements adjacent to the separating slot due to the elastic flexibility of the outer sleeve can be retracted radially.

Another feature of the innovation are the connecting elements when slitting already assembled rolling bearings for longitudinal movements remaining as flexible ones Connecting webs arranged. The separating slots are preferably made from the outside, for example through Saws or the like., Incorporated. The outer sleeve is completely separated, but the cage is only slit so deep that that a thin connecting web remains over the entire length of the cage. In particular In the case of plastic cages, the elasticity is usually sufficient to allow the necessary radial displacement of the neighboring ones To enable rolling element series. The subsequent slotting of rolling bearings for longitudinal movements the normal version has particular advantages for an economical production and storage, since the production except for the slitting in both versions can be the same.

In another embodiment, when the cage is manufactured, the connecting elements are in the form of a Hinge designed with predetermined bending points. This creates a connecting element that moves particularly smoothly in the radial direction created, which, however, securely holds the cage together and positions the rows of rolling elements exactly axially.

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According to a further feature of the innovation, in addition to the separating slot, there is also another only partial radial Axial slot extending through the outer sleeve is provided. This version is used especially there, where a large force counteracting the radial adjustment is necessary, the adjustment range of the once slotted design is not sufficient.

With multiple slotted rolling bearings for longitudinal movements, according to another embodiment of the Innovation the segments of the outer sleeve by suitable means, such as snap-in pegs or the like. On the cage be attached.

Another possibility to secure segments of the outer sleeve against falling out is that the separating slots, causing the segments to hold themselves, extend radially inclined to one another. This creates a holding device also referred to as a dovetail "for slide guides in machine tool construction, which advantageously without the aid of other elements only by attaching the separating slits at an angle arises.

In order to prevent an accumulation of To prevent dirt, the dividing slits can be filled with a soft elastic material.

With the design according to the innovation, a roller bearing for longitudinal movements was created which, with very little effort, among other things can be produced from the normal version and also maintains the precision.

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The innovation is described below using the examples shown in the drawings:

Show it:

Fig. 1 shows the cross section of a roller bearing for longitudinal movements with two separating slots and

2 shows the partial view of a roller bearing for longitudinal movements with a separating slot, a predetermined bending point and a hinge as a connecting element in cross section.

The rolling bearing for longitudinal movements shown in Fig. 1 consists of an outer sleeve 1 with axially extending raceways 4, 6 in the bore, a cage 2 and six endless rows of balls 3, the balls of which are in the load zone 4 between a shaft 5 and the outer sleeve 1 run, are deflected in a locking ring, not shown, and run back into the load zone 4 via the return tracks 6 of the outer sleeve 1 and a further locking ring. The outer sleeve 1 and the locking rings are provided between the raceways 4, 6 at two points with axially continuous separating slots 7, so that a segment with a row of balls 3 ¹ is formed. The cage 2 was slit only so deep in the radial direction that elastic connecting webs 8 remain. This will keep the cage in its shape. By means of a screw 11 arranged in a housing 10 or the like, the entire segment is radially displaceable over an engagement surface 12. When adjusting, the balls in the row of balls 3 ¹ in the load zone 4 grip an axially running track

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of the shaft 5. The connecting webs 8 are elastically deformed. If necessary, a second or several the same arrangements are provided.

In the ball bushing shown in Fig. 2 is opposite the embodiment in Fig. 1 instead of the second separating slot 7 to create a predetermined bending point only partially radially extending slot 14 is provided in the outer sleeve 1. The weakening of the material causes a Radial adjustment with the screw 11, an elastic bend preferably occurs at this point. That in the separating slit 7 arranged connecting element is designed as a hinge 15 that is used in the manufacture of the plastic cage is molded.

The embodiments shown in the figures, in particular the type of connecting elements are only examples and can also be replaced by other solutions.

Claims (6)

SKF KUGELLAGERFABRIKEN GMBH Schweinfurt, 10/24/80 DE 80 056 DE TPA.ko.tr Rolling bearings for longitudinal movements Protection claims 1. Rolling bearings for longitudinal movements on a shaft, in which at least one axially running track is incorporated is, consisting of an outer sleeve with axially extending raceways in the bore, in where the rolling elements are arranged from endless rows of rolling elements distributed around the circumference, and from one Cage built into the outer sleeve for guiding the rolling elements, the outer sleeve having at least one has axially extending slot, in the area of which engages in the raceway of the shaft endless row of rolling elements is arranged to transmit the torque, characterized in that the slot of the outer sleeve (1) is designed as a narrow axially continuous separating slot (7) that the cage (2) leading the rolling elements of the endless rows of rolling elements also the rolling elements of the endless Rolling element row (3) for the transmission of the torque takes up and in the area of the separating slots (7) holding together, a mutual radial shift -2- -2- Exercise of the ends of the cage allowing connecting elements (8,15) and that the entire, the respective Separating slot (7) adjacent row of rolling elements (3) to the axially running track (13) of the shaft (5) is arranged radially adjustable. 2. Rolling bearing for longitudinal movements according to claim 1, characterized in that the connecting elements of the The cage (2) remains as flexible when slitting fully assembled rolling bearings of the normal design Connecting webs (8) are arranged. 3. Rolling bearing for longitudinal movements according to claim 1, characterized in that the connecting elements are designed in the form of a hinge (15) with predetermined bending points during the manufacture of the cage (2). 4. Rolling bearing for longitudinal movements according to one of claims 1 to 3, characterized in that in addition to the separating slot (7) yet another axial slot that only partially extends radially through the outer sleeve (1) (14) is provided. 5. Rolling bearing for longitudinal movements according to one of claims 1 to 4, characterized in that with multiple slits Outer sleeve (1) the segments of the outer sleeve (1) by suitable means, such as snap-in pins (9) or the like., Are attached to the cage (2). 6. Rolling bearing for longitudinal movements according to one of claims 1 to 4, characterized in that at several times slotted outer sleeve (1) the separating slots (7), a self-retaining of the segments of the outer sleeve (1) causing, extend radially inclined to each other. -3-