PRE-ASSEMBLED UNIT HAVING TWO TAPERED ROLLER BEARINGS

Abstract

The present invention relates to a pre-assembled unit having two tapered roller bearings, for a driven shaft designed to be replaced efficiently and to maintain optimal tightness as if it were factory assembled. The bearing comprises a rubber seal attached to the lateral face of the inner race of one of the tapered rollers, said face being opposite the smooth face of the other tapered roller. The necessary widening of the inner races requires a second invention, namely, a roller cage that allows the rollers to rock slightly in order to be assembled without causing damage or becoming damaged.

Claims

1. A pre-assembled unit having two tapered roller bearings comprising; an inner race (1) of the sealing cone (4) which on its free side face consists of a recess (10) limited by an outer ring (11) and an inner ring (12), a smooth inner race (2) of the smooth cone (3) wherein its free lateral face (9) is completely smooth, a rubber seal (8) inserted in the recess (10), and two cages (5) that mount rollers (6), each of said cages (5) comprising a larger cage ring (13) and a smaller cage ring (14), a series of arms (15) disposed equidistantly around joining the larger cage ring (13) and the smaller cage ring (14), each of them having a trapezoidal section with a slight progressive widening towards the base, considering the base to be the part closest to the diameter cage ring (13), a pronounced widening at its base (16) which rises along the arm perpendicular to the ground and a notch or cut (18) on the inside of both inner faces.

2. The pre-assembled unit having two tapered roller bearings according to claim 1, wherein the free lateral faces of the outer race (11) and the inner race (12) delimiting the recess (10) for the rubber seal (8) are smooth and are opposite each other.

3. The pre-assembled unit of two tapered roller bearings according to claim 1, wherein the rubber seal (8) is fixed to the recess (10) by means of adhesive and/or pressure.

4. The pre-assembled unit of two tapered roller bearings according to claim 1, wherein the section of the rubber seal (8) is chosen from among the following configurations: circular, regular polygonal, and irregular polygonal.

5. The pre-assembled unit having two tapered roller bearings according to claim 1, wherein the inner ring (1, 2) increases in diameter progressively with respect to the inner diameter of the cone (3, 4).

Description

DESCRIPTION OF THE FIGURES

[0021] In order to better understand the object of the present invention, a preferential practical embodiment thereof has been represented in the attached drawing.

[0022] FIG. 1Shows the pre-assembled unit having two tapered roller bearings.

[0023] FIG. 2Shows a section of the inner races, the housing recess (10) and the rubber seal (8).

[0024] FIG. 3Shows the cone of the seal (4) prior to assembly where the outer face with the rubber seal (8) and its inner race (1) can be seen.

[0025] FIG. 4Shows the cage (5) where its construction and the most relevant details of the arms (15) can be seen.

[0026] FIG. 5Shows the inner race (1) with the cage (5) and rollers (6) mounted, but without the outer race (7).

PREFERRED EMBODIMENT OF THE INVENTION

[0027] The device, pre-assembled unit having two tapered roller bearings, object of the present invention shows, in FIG. 1, said bearing mounted. As can be observed in the drawing, there are two paired roller bearings (6). The inner race (1) conceals in the free outer face, a recess (10) that houses a rubber seal (8) selected between an O-ring of commercial use or a regular or irregular polygonal section especially designed to seal the joint, which presses on the smooth outer face of the smooth inner race (2), providing the necessary tightness for the proper useful life of this type of bearings whose application are driven shafts. Also shown in this figure, under the outer race (7) of the bearings, is the position of the cage (5) with the rollers (6) mounted on the sealing cone (4) and on the plain cone (3).

[0028] FIG. 2 shows a detail of the main object of the invention, the special design of the free lateral face of the inner race (1) side face, with a recess (10) for inserting a rubber seal (8). This recess is limited by an outer race (11) and an inner race (12) which collide with the smooth outer face (9) of the smooth inner race (2) of the smooth cone (3). Both bearings are fixed by a sealing washer (18). The pressure exerted by the preload whereby the pre-assembled unit having two tapered roller bearings is mounted in the application deforms the rubber, creating a seal that prevents the entry of contaminating fluids, thus improving the useful life of the bearing.

[0029] FIG. 3 shows the sealing cone (4) where it can be seen that in order to place the rubber seal (8) in the recess (10) on the outer face of the inner race (1) a widening of the latter is required. This necessary widening makes a new cage design (5) necessary which allows the rollers (6) to rock so that they can be mounted without being damaged or damaging the sealing cone (4) or the smooth cone (3) due to friction.

[0030] FIG. 4 shows the cage (5). This cage is designed on the basis of two rings (13, 14), a ring of larger diameter (13) and another ring of smaller diameter (14) joined by arms (15) that are distributed equidistantly along the entire contour of the rings. This cage (5) as a whole has a conical volume, in each of the recesses we place a conical roller (6) and the cage (5) rollers (6) assembly is mounted on the cones (3, 4). In order not to damage the cones (3, 4) or the rollers (6) due to the widening of the inner races (1, 2), we must allow a rocking movement of the rollers (6) without the risk of falling or losing any roller (6) in the assembly. For this purpose, a special design of the arms (15) of the cage (5) has been created. The arm (15) of the cage has a trapezoidal section with a slight progressive widening towards the base, considering the base to be the part closest to the ring of larger diameter (13). This arm (15), seen from the outside, has a pronounced widening at its base (16) that rises along the arm perpendicular to the ground the necessary length to allow the roller to rock and provide a safe and reliable mounting, the other narrow part of the arm (17) rises to join the race of smaller diameter (14), maintaining its trapezoidal section and the slight narrowing. On the inside of the arm, there is a notch or cut (18) on both inner faces, which allows the rollers (6) to rock slightly without allowing them to fall.

[0031] FIG. 5 shows one of the bearings of the assembly shown in FIG. 1, specifically the cone (4) where the rubber seal (8) is mounted and how the cage (5) is seated with the rollers (6) in the absence of mounting the outer race (7). The rollers (6) are perfectly seated on the conical surface of the cone (3, 4) and the need for the rocking to allow the assembly can be observed and that the purpose of such rocking is to avoid damage to rollers (6), cone (3, 4) and/or outer race (1, 2).

[0032] Persons skilled in the art will easily understand that the characteristics of different embodiments can be combined with characteristics of other possible embodiments whenever such a combination is technically possible.