SK17722000A3 - Rolling bearing - Google Patents

Abstract

The invention relates to a rolling bearing comprising an inner raceway (10), an outer raceway (30), a set of rollers (12) which run between the inner raceway (10) and the outer raceway (30) and a cage (100) which keeps the rollers (12) apart. Said cage (100) has two cage raceways (101, 102) between which webs (104) with projections for holding the rollers (12) extend. The inner raceway (10) has ring flanges (10b, 10c) between which the front faces (12b) of the rollers (12) are guided. The webs (104) taper in towards the bearing axis (40a). The projections are formed by pieces with wedge side faces (104b) located on the ends of the webs.

Description

Rolling bearing

The area of technical

The invention relates to a roller bearing with an inner ring, an outer ring, a set of rollers circulating between the inner ring and the outer ring, and with a cage with two cage rings, between which rollers are arranged whose spacing is maintained by bridges.

BACKGROUND OF THE INVENTION

Roller bearings of this kind or cages for such roller bearings are known, for example, from DT-C3-14 00 324, DE-A1-31 34 241, DE-C2-34 24 741, DE-A1-44 42 269, DE- A1-196 19 712, DE-A1-196 54 584, EP-B1-0 225 508 and EP-A1-0-392 146.

With these known roller or roller bearings, the cage bridges have a considerable width, so that only a limited number of rollers can be placed in the bearing and thus the maximum permissible load on the roller bearing is relatively low.

It is an object of the invention to provide a roller bearing of the type mentioned above, which is characterized by a high roller density and which is easy to mount.

SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION An internal ring roller bearing, an outer ring, a set of rollers circulating between the inner ring and the outer ring, and a cage with two cage rings between which rollers are arranged whose spacing is maintained by bridges to accomplish the task, wherein the inner ring and / or outer ring has at least one annular flange for the rollers, the bridges tapering in a radial direction and the inner ring and / or outer ring has at least one axially open recess for one of the cage rings.

Obviously, the invention is feasible in any case when it is a bearing consisting essentially of three different parts and a certain number of rollers. The rollers are located between the outer and inner rings and are separated by a cage. The special feature of the cage is that it consists of two cage rings of different diameters and bridges, which are generally wedge-shaped and ensure that the spacing of the rollers is minimal. As a rule, circular recesses or flanges are provided in the inner and / or outer ring, which ensure, in particular, a compact fit of the cage in the rings. At the same time, it is also ensured that the cage can be inserted in the axial direction between the two rings, but is not passable between the rings.

By these measures it is possible to achieve a greater mounting density of the rollers than with the known roller bearings, so that greater forces can be transmitted. The mounting of the roller bearing can be carried out simply in that the inner ring mounted on the machine shaft is fitted with rollers, the rollers being held in position by grease. Then the shaft with the inner ring and the rollers is inserted into a cage equipped with the outer ring of the bearing. The cage can be held on the outer ring in any manner and the wedge bridges can be placed between the rollers. Due to the small contact surfaces between the rollers and the side wedge-shaped parts of the cage, the friction between the rollers and the cage is minimized.

The running surfaces in which the rolling bearings are guided can, of course, also be formed in the outer ring itself, i.e. not on the inner ring, so that the cage can be appropriately replaced and supported on the inner ring. The various embodiments of the invention therefore have in common that the cage, which serves to separate the generally cylindrical roller bearings, is mounted in the outer or inner ring and can be inserted into the bearing in the axial direction.

Further embodiments of the invention which concretise or develop its essence are then summarized.

The cage is adapted to be inserted between the rings in the axial direction and to be positioned between the rings. The outer and inner diameters of the cage rings are adapted to the inner and / or outer diameters of the bearing rings with respect to the outer diameters of the rollers. These measures ensure that cage rings, which generally have different diameters, can be inserted between the bearing rings but do not pass through the bearing.

The circular flanges are directed on the roller axes. The purpose of this measure is that the rollers are guided either by one or the other of the cage ring or by both of them.

The bridges are designed as protrusions which preferably have a substantially trapezoidal or triangular cross-section. Within the scope of this inventive idea, it is expedient for the bridges to have wedge-shaped side portions. This ensures the stability of the cage and, moreover, it is sufficient to maintain only minimal distances between two adjacent rollers.

The width of the bridges in the area of the wedge-shaped side parts is such that the distance between the rollers is minimized while maintaining the possibility of bearing lubrication. In this way, the number and density of the roller distribution can be determined to an optimum value, which allows a favorable transmission of forces. Preferably, the distance between the rollers is 0.1 to 0.8 mm.

The side recess has a circular shape into which a cage ring is flush. Such a bearing is suitable in the form of a double bearing in which the sides of the two outer rings equipped with a recess touch each other. The cage ring can also be pressed in.

A recessed wedge portion is formed between the wedge-shaped side portions and is not in contact with the rollers. The substantially centered wedge portion is larger than the sum of the areas of the two other wedge-shaped side portions.

The recess has a stepped cross-section.

The axial outer surfaces of the cage rings are located inside the outer ring of the bearing and the cage is made of plastic.

Further advantages of the invention are in particular that the proposed bearing can be used not only for the centric but also for the eccentric bearing of the shafts and components. In the eccentric bearing, additional forces are exerted, whereby both the bearing itself and the housing are subjected to extra stress. According to the prior art, the cage is guided radially on the rollers and thus is extremely loaded by the rollers when eccentrically mounted. On the other hand, the guide or mounting of the cage according to the invention is provided on the outer ring and / or on the inner ring, whereby the cage can advantageously be used especially for the eccentric mounting of components. In such an embodiment, the cage is not particularly stressed by additional forces acting on the roller bearings. The construction of the cage does not have to be robust. At the same time, the cage is easy to mount.

Finally, it is also important that the cage according to the invention allows a small width of the roller bearing to be chosen, since the cross-section of the cage rings can be small. In this case, however, the cages can be sufficiently high, since in the radial direction sufficient space is provided for them and the cage's primary task of separating the rollers is fulfilled, while at the same time ensuring that the rollers are evenly distributed around the circumference of their orbit. The cage is generally made of plastic and can be made by injection molding.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is explained in more detail below with reference to the accompanying drawings, in which: FIG. 1 is an enlarged perspective view of a roller bearing;

Fig. 2 is a radial section through the assembled roller bearing of FIG. 1;

Fig. 3 shows another radial section of the assembled roller bearing according to FIG. 1;

Fig. 3a - a roller bearing according to FIG. 3, but without the cage;

Fig. 4 is an axial plan view of the cage shown in FIG. 1 with a section of the edge in section;

Fig. 5 is a cross-sectional view of the cage taken along line V-V of FIG. 4;

Fig. 6 shows a partial section VI in FIG. 4 on an enlarged scale;

Fig. 7 - detail VII in FIG. 8 on an enlarged scale;

Fig. 8 is a reduced perspective view of the cage shown in FIG. 4;

Fig. 9 is a radial section of the assembled roller bearing according to the second exemplary embodiment;

Fig. 10- another radial section of the assembled bearing according to the second embodiment;

Fig. 10a shows the roller bearing of FIG. 10, but without the cage;

Fig. 11 is an axial plan view of the cage shown in FIG. 9 with a partial cross-section XIII;

Fig. 12 is a cross-sectional view of the cage along line XII-XII in FIG. 11;

Fig. 13 is a partial section XIII of FIG. 11 on an enlarged scale;

Fig. 14 - detail XIV of FIG. 15 on an enlarged scale;

Fig. 15 is a reduced perspective view of the cage shown in FIG. 9;

Fig. 16 is a radial section of an assembled bearing according to a third embodiment;

Fig. 17 - another radial section of the assembled roller bearing according to the third embodiment;

Fig. 17a - the roller bearing of FIG. 16, but without the cage;

Fig. 18 is an axial plan view of the cage shown in FIG. 17 with a partial edge section XX;

Fig. 19 is a cross-sectional view of the cage along the XIX-XIX line of FIG. 18;

Fig. 20 is a partial section XX of FIG. 18 on an enlarged scale;

Fig. 21 - detail XXI of FIG. 22 on an enlarged scale;

Fig. 22 is a reduced perspective view of the cage shown in FIG. 16, FIG. 23 is a radial section of an assembled bearing according to a fourth embodiment;

Fig. 24 - another radial section of the assembled roller bearing according to the fourth embodiment;

Fig. 24a - the roller bearing of FIG. 24, but without cage;

Fig. 25 is an axial plan view of the cage shown in FIG. 23 with a partial cross-section XXVIII;

Fig. 26 is a cross-sectional view of the cage taken along line XXVI-XXVI of FIG. 25;

Fig. 27 is a partial section XXVII of FIG. 25 on an enlarged scale;

Fig. 28 - detail XXVIII of FIG. 29 on a larger scale;

Fig. 29 is a reduced perspective view of the cage shown in FIG. 23rd

DETAILED DESCRIPTION OF THE INVENTION

The roller bearing shown in FIG. 1 consists of an inner ring 10, a set of rollers 12, a cage 100 and further an outer ring 30 and is mounted so as to rotate about an axis 40a.

The inner ring 10 is provided at its axial ends with an annular flange 10b or 10c, respectively, which defines a running surface 10a for the rollers 12. The rollers 12 are secured against axial displacement by the circular flanges 10b, 10c. The distance A between the rollers 12, when inserted into the inner ring 10, is preferably about 0.1 mm. The rollers 12 may be inserted into the inner ring 10 together with the lubricating grease, for example from a circular reservoir not shown in the figure. The axial length of the rollers corresponds approximately to the distance between the circular flanges 10a and 10c.

The cage 100 has a front cage ring 102, a rear cage ring 101, and a plurality of bridges 104 corresponding to the number of rollers 12, which are transverse to the cage rings 101, 102, and are equally spaced around the periphery of the cage 100. a wedge-shaped cross-section, here, for example, a trapezoidal cross-section, as particularly seen in FIG. 4 and FIG. 6. In general, the bridges 104 are shaped to taper toward the axis of the rollers 12. The bridges 104 are, as is most clearly apparent from FIG. 7, at their ends provided with protrusions in the form of wedge-shaped surfaces 104a against which the central wedge-shaped surfaces 104c are mounted inwards. The wedges 104a and 104b serve to guide the rollers 12, while the middle wedges 104c do not contact the rollers 12. The contact surfaces of the roller bridges 104 are therefore very small. The rollers 12 are rotatable about their axes and are provided with circular cylindrical surfaces 12a. One axial / end face 12b of the rollers 12 contacts the surface 101b. The front cage ring 102 has a larger inner diameter d1 (FIG. 3) than the inner diameter d2 of the outer ring 30, while the rear cage ring 102 has a smaller outer diameter d3 than the inner diameter d2 of the outer ring 30. Under these conditions, To mount the roller bearings, first insert the cage 100 over the rollers 12, or insert the rollers 12 into the cage 100 and further insert the cage 100 into the outer ring 30. With the roller bearing assembled, the rear face 12b of each roller 12 rests on the inner surface 101b of the cage ring.

101 (FIG. 3).

In the front side of the outer ring 30, a circular recess 30 'with a diameter d4 is provided, which forms a vertical contact surface 30' a and a horizontal contact surface 30 'b, and a radial inner side defines a further running surface 31 for the rollers 12 (Figs. 2, 2a). The front cage ring 102 is adapted to this recess 30 so that its inner surface 102a is situated opposite the vertical outer surface 30'a, while the edge surface 102b of the cage ring 102 is situated against the horizontal contact surface 30'b. The outer surface 102c of the cage ring 102 coincides approximately with the front side surface of the outer ring 30 or is recessed inwardly with respect thereto. The mounting of the cage 100 on the outer ring 30 can be carried out in any manner. Preferably, however, the assembly is performed by inserting the front cage ring 102 into a recess 30 'in which it is supported and displaceably supported.

FIG. 2 also shows that the outer surface 104d of each bridge 104 is mounted with respect to the peripheral radial surface 101a of the inner cage ring 101 inwardly so that a larger gap 29 is formed between the race surface 31 of the outer bearing ring 30 and the outer surface 104d of the bridge 104. better grease penetration. The cage shown in FIG. 4, 5 and 8 with the cage rings 101, 102 have dimensions d1 and d5 or d3 in the radial direction. The larger cage ring 102 has two radially directed surfaces 102a and 102c as well as one axially directed surface 102b, while the smaller cage ring 101 is provided with surfaces 101a, 101c and 101b (see Fig. 3). The following applies: d3 <d2 <dl and d5 <d4.

The dimensions are chosen such that the cage 100, due to the extent of its radial clearance, does not reach the rollers 12, otherwise the cage could be radially guided on the rollers 12, which is undesirable. Rather, the cage is guided by its peripheral radial surfaces 101a and 102b on the horizontal contact surface 30'b and the race face 31 of the bearing ring.

In FIG. 9 to FIG. 15 shows a second possible embodiment of the invention, wherein components having the same function as in the embodiment of FIG. 1 to 8 are distinguished by index 1. A particularity of this embodiment is that the inner ring

10.1 bearings has only one annular flange 10b.1, the outer ring

30.1, the annular flange 30.1 and the cage 100.1 are shaped so that it can be operatively positioned between the inner ring 10.1 and the outer ring 30.1 of the bearing.

The particularity of the cage 100.1 is that its rear cage ring 101.1 has a stepped shoulder, its surface 101a.1 and 101b.1 cooperating with the flange 30.1. The rollers 12 are guided between the ring flanges 10b.1 and 30.1 of the bearing rings (FIG. 10a). The following applies: d3 <d6 <dl <d2 <d5 <d4.

In FIG. 16 to 22 show a third embodiment of the invention, wherein components having the same function as in the embodiment of FIG. 1 to 8 are distinguished by index 2. A third embodiment of the invention shown in FIG. 16 to 22 has the particularity that the outer ring 30.2 of the bearing is provided with two circular flanges 30'.2 and 30.2, while the inner ring 10.2 does not have any circular flange and also has a circular recess 10 '. Accordingly, a cage 100.2 is also formed, its bridges 104.2 tapering inwardly from the central axis 40a. This embodiment of the invention therefore differs from the first embodiment of FIG. 1 in that the circular flanges 30 '. 2, 30. 2 have an outer ring 30.2 and a recess 10 '. 2 is formed in the inner ring 10.2. There is also some kinematic reversal of certain functional parts. The following applies: d4 <d5 <dl <d2 <d3. The cage ring 100.2 is therefore designed in the form of an external toothed gear, while the cage 100 of FIG. 8 is designed in the form of a gear with internal toothing.

In FIG. 23-29 illustrates a fourth embodiment of the invention, wherein components having the same function as the embodiment of FIG. 1 to 8 are distinguished by index 3.

The embodiment of the invention shown in FIG. 23 to 29 has the particularity that the outer bearing ring 30.3 has only one annular flange 30 '. 3, while the inner ring 10.3 has a circular recess 10 '3 and a circular flange 10c.3. The shape of the cage 100.3 is adapted accordingly. The following applies: d4 <d5 <dl <d2 <d3.

Industrial usability

The invention can be used especially in cases where it is necessary for bearings to carry high loads at relatively small construction dimensions. These cases also include eccentric bearings of shafts and building components.

Claims (13)

PATENT CLAIMS A roller bearing with an inner ring (10), an outer ring (30), a set of rollers (12) circulating between the inner ring (10) and the outer ring (30) and a cage (100) with two cage rings (101, 102); between which rollers (12) are arranged, the spacing of which is maintained by bridges (104), characterized in that the inner ring (10, 10.1, 10.2, 10.3) and / or the outer ring (30, 30.1, 30.2, 30.3) has at least one annular flange (10b, 10c, 10b.1, 30.1, 30'.2, 30.2, 30'.3, 10c.3) for the rollers, the bridges (104, 104.1, 104.2, 104.3) taper in the radial direction and the inner ring (10, 10.1, 10.2, 10.3) and / or the outer ring (30, 30.1, 30.2, 30.3) has at least one axially open recess (30 ', 30', 1, 10'.2, 10'.3) for one of the cage rings (101, 102; 101.1, 102.1; 101.2, 102.2; 101.3, 102.3). Rolling bearing according to claim 1, characterized in that the cage (100) is adapted to be inserted between the rings (10; 30) in the axial direction and fitted between the bearing rings (10; 30). Rolling bearing according to claim 1 or 2, characterized in that the outer and inner diameters of the cage rings (101, 102) are adapted to the inner and / or outer diameters of the bearing rings (10, 30) with respect to the outer diameters of the rollers. Rolling bearing according to one of Claims 1 to 3, characterized in that the circular flanges (10b, 10c) face the axes (12c) of the rollers (12). Rolling bearing according to one of Claims 1 to 4, characterized by 12 reading because of bridges (104) are created as projections. 6. Rolling bearing according to one of claims 1 to 12 5, reading because of bridges (104) have trapezoidal or a triangular cross-section. 7. Rolling bearing by of one of the claims 1 to 6, s on the reading by bridges (104) have wedge post morning parts (104a, 104b). Rolling bearing according to one of Claims 1 to 7, characterized in that the width of the bridges (104) is such that the distance (A) between the rollers (12) is minimized while maintaining the possibility of bearing lubrication. Rolling bearing according to one of Claims 1 to 8, characterized in that the distance between the rollers (12) is 0.1 to 0.8 mm. Rolling bearing according to one of Claims 1 to 9, characterized in that the lateral recess (30 ') has a circular shape into which one cage ring (102) is flush. Rolling bearing according to one of Claims 1 to 10, characterized in that a recessed wedge part (104c) is formed between the wedge-shaped side portions (104a, 104b) and is not in contact with the rollers (12). Rolling bearing according to one of Claims 1 to 11, characterized in that the substantially centrally located wedge-shaped part (104c) is larger than the sum of the areas of the two other wedge-shaped side parts (104a, 104b). Rolling bearing according to one of Claims 1 to 12, characterized in that the recess (30 ') has a stepped cross-section. Rolling bearing according to one of Claims 1 to 13, characterized in that the axial outer surfaces (101c, 102c) of the cage rings (101, 102) are located inside the outer ring (30). Rolling bearing according to one of Claims 1 to 14, characterized in that the cage (100) is made of plastic.