INNER-RING-FASTENED ROLLER SLEEVE AND METHOD FOR PRODUCING SAME

Abstract

The invention relates to an inner-ring-fastened roller sleeve (1), comprising: —an inner ring (2), which is fastened on a shaft or axle; and—a roller-and-cage assembly (3), which is disposed on said inner ring (2) and is formed by a bearing cage (4), which consists of two side rings (5, 6) and a plurality of connecting webs (7), and by a plurality of roller-type rolling elements (8) inserted into said bearing cage (4), which roller-type rolling elements are retained by the bearing cage (4) at regular spacings in the circumferential direction and roll on an inner raceway (9) formed by the outer lateral surface of the inner ring (2), wherein the roller-and-cage assembly (3) is axially guided by means of two flanges (10, 11), which are provided on the axial sides of the inner ring (2) and extend radially outward.

According to the invention, because the inner ring (2) is designed with a flange (11) having a greater outer diameter than the other flange (10) on the inner ring (2) and because said flange (11) is designed with an edge ring (12) bent axially toward the roller-type rolling elements (8), the inner ring (2) can be produced as a finally formed and thermally treated component and an axially slotted plastic cage can be used as the bearing cage (4), one side ring (6) of which plastic cage is radially surrounded by the axially bent edge region (12) of the flange (11) having the greater outer diameter and thus fixes the roller-and-cage assembly (3) in the inner ring (2).

Claims

1. An inner-ring-fastened roller sleeve (1), comprising an inner ring (2) which is fastened on a shaft or axle and a roller-and-cage assembly (3), which is disposed on said inner ring (2) and is formed by a bearing cage (4), which consists of two side rings (5, 6) and a plurality of connecting webs (7) and by a plurality of roller-type rolling elements (8) inserted into said bearing cage (4), which roller-type rolling elements (8) are retained by the bearing cage (4) at regular spacings in the circumferential direction and roll on an inner raceway (9) formed by the outer lateral surface of the inner ring (2), wherein the roller-and-cage assembly (3) is axially guided by means of two flanges (10, 11), which are provided on the axial sides of the inner ring (2) and extend radially outwards, characterized in that because the inner ring (2) is designed with a flange (11) having a larger outer diameter than the other flange (10) on the inner ring (2) and because said flange (11) is designed with an edge region (12) bent axially towards the roller-type rolling elements (8), the inner ring (2) can be produced as a finally formed and thermally treated component and an axially slotted plastic cage can be used as the bearing cage (4), one side ring (6) of which can be radially surrounded by the axially bent edge region (12) of the flange (11) having the larger outer diameter and thus fixes the roller-and-cage assembly (3) in the inner ring (2).

2. The inner-ring-fastened roller sleeve (1) according to claim 1, characterized in that one side ring (5) of the bearing cage (4) has a larger outer diameter than the other side ring (6) of the bearing cage (4) and that both side rings (5, 6) are connected to one another by connecting webs (7) which are Z-shaped in profile cross-section.

3. The inner-ring-fastened roller sleeve (1) according to claim 2, characterized in that the side ring (5) of the bearing cage (4) having the larger outer diameter radially surrounds the flange (10) on the inner ring (2) having the smaller outer diameter with a gap spacing, and the bearing cage (4) is designed as a rolling-element-guided bearing cage.

4. The inner-ring-fastened roller sleeve (1) according to claim 1, characterized in that the flange (11) of the inner ring (2) which has a larger outer diameter is formed with a lower material thickness than the flange (10) of the inner ring (2) which has a smaller outer diameter.

5. The inner-ring-fastened roller sleeve (1) according to claim 1, characterized in that the bearing cage (4) is slotted axially centrally through one of its connecting webs (7) and the opposite ends of the bearing cage (4) rest loosely against one another without a connecting lock.

6. A method for producing an inner-ring-fastened roller sleeve (1) having the features of claims 1 to 5, characterized by the following steps: a) punching out a round blank from a sheet metal strip made of through-hardening or case-hardening steel; b) deep-drawing the round blank to form a pot-shaped starting part, wherein an angled circumferential pot edge forms the flange (10) having a smaller outer diameter and the outer lateral surface of the pot wall forms the inner raceway (9) and the flange (11) of the inner ring (2) having a larger outer diameter; c) calibrating that part of the outer lateral surface of the pot wall which forms the flange (11) of the inner ring (2) having a larger outer diameter to a smaller material thickness; d) hammering out the one flange (11) of the inner ring (2) having a smaller outer diameter; e) punching out the base of the pot-shaped starting part along the inner lateral surface of the pot wall; f) trimming the angled pot edge to the finished diameter of the flange (10) having a smaller outer diameter; g) forming the edge region (12), which is bent axially to fix the bearing cage (4), on the flange (11) having a larger outer diameter by bend-pressing; h) bending the flange (11) having a larger outer diameter by bend-pressing to form the finally formed inner ring (2) having two outwardly directed flanges (10, 11). i) thermally treating the finally formed inner ring (2) by hardening and tempering; j) widening the axially slotted plastic bearing cage (4) to such an extent that it can be pushed over the flange (10) having the smaller outer diameter into the inner ring (2); k) overlapping the ends of the bearing cage (4) in such a way that it can be pushed under the axially bent edge region (12) of the flange (11) having the larger outer diameter; l) relaxing the bearing cage (4) in such a way that its ends rest loosely against one another and inserting the roller-type rolling elements (8) into the pockets of the bearing cage (4) formed between the connecting webs (7).

7. The method for producing an inner-ring-fastened roller sleeve (1) according to claim 6, characterized in that step i) is optionally followed by surface machining of the inner ring (2) by grinding the inner raceway (9).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0034] A preferred embodiment of the roller sleeve designed according to the invention is explained in more detail below with reference to the accompanying drawings. In the drawings:

[0035] FIG. 1 shows a side view of a roller sleeve designed according to the invention;

[0036] FIG. 2 shows the section A-A according to FIG. 1 through the roller sleeve designed according to the invention;

[0037] FIG. 3 shows the detail Z of the sectional view through the roller sleeve designed according to the invention according to FIG. 2;

[0038] FIG. 4 shows the detail Y of the sectional view through the roller sleeve designed according to the invention according to FIG. 2;

[0039] FIG. 5 shows a three-dimensional overall view of the roller sleeve designed according to the invention.

DETAILED DESCRIPTION OF THE DRAWINGS

[0040] FIGS. 1, 2 and 5 each show an inner-ring-fastened roller sleeve 1, which roller sleeve consists of an inner ring 2 fastened to a shaft or axle (not shown) and a roller-and-cage assembly 3 disposed on this inner ring 2. As can be seen in FIGS. 3, 4 and 5, the roller-and-cage assembly 3 is formed by a bearing cage 4 consisting of two side rings 5, 6 and a plurality of connecting webs 7 and from a plurality of roller-type rolling elements 8 which are inserted into this bearing cage 4 and which are retained by the bearing cage 4 at regular spacings in the circumferential direction and roll on an inner raceway 9 formed by the outer lateral surface of the inner ring 2. For the axial guidance of the roller-and-cage assembly 3 in the inner ring 2, two flanges 10, 11 are provided in a known manner on the axial sides of the inner ring 2, which extend radially outwards.

[0041] In order to be able to produce the inner ring 2 for such a roller sleeve 1 as a finally formed and thermally treated component and to be able to use a cost-effective axially slotted plastic cage as the bearing cage 4, as can be seen in particular from the illustrations in FIGS. 3 and 4, one flange 11 is formed on the inner ring 2 with a larger outer diameter than the other flange 10 on the inner ring 2, and its edge region 12 is bent axially towards the roller-type rolling elements 8 so that one side ring 6 of the bearing cage 4 is surrounded radially by the axially bent edge region 12 of the flange 11 and fixes the roller-and-cage assembly 3 in the inner ring 2.

[0042] FIGS. 3 and 4 also show that one side ring 5 of the bearing cage 4 has a larger outer diameter than the other side ring 6 of the bearing cage 4 and that both side rings 5, 6 are connected to one another by connecting webs 7 which are Z-shaped in profile cross-section.

[0043] It is also clear from FIGS. 3 and 4 that the side ring 5 of the bearing cage 4 having the larger outer diameter radially surrounds the flange 10 on the inner ring 2 having the smaller outer diameter with a gap spacing, and the bearing cage 4 is designed as a rolling-element-guided bearing cage.

[0044] In addition, FIGS. 3 and 4 show that the flange 11 of the inner ring 2 which has a larger outer diameter is designed with a smaller material thickness than the flange 10 of the inner ring 2 which has a smaller outer diameter for better formability.

[0045] Finally, from the upper region of FIG. 5, it can also be seen that the axial slotting of the bearing cage 4 takes place axially centrally through one of its connecting webs 7 and that the opposite ends of the bearing cage 4 rest loosely against one another without a connecting lock.

LIST OF REFERENCE SIGNS

[0046] 1 Roller sleeve [0047] 2 Inner ring [0048] 3 Roller-and-cage assembly [0049] 4 Bearing cage [0050] 5 Side ring of 4 [0051] 6 Side ring of 4 [0052] 7 Connecting webs of 4 [0053] 8 Roller-type rolling element [0054] 9 Inner raceway [0055] 10 Flange on 2 [0056] 11 Flange on 2 [0057] 12 Edge region of 11