CN105387065A - Conveyor belt roller device - Google Patents

Abstract

The conveyor belt roller device (1) of the present invention comprises a pulley (3), a rolling bearing (5) comprising an outer ring (50) on which the pulley (3) is mounted, and an inner ring into which fastening screws (7) are inserted (52), and the fastening screw includes a top (70) and a thread (72). The device also comprises a retaining flange (9) for retaining the screw (7) in the inner ring (52), characterized in that the retaining flange (9) comprises a cylindrical part into which the top of the screw (7) is inserted inside , and an annular portion (92) extending inwardly from the middle portion (74) of the screw (7) between the top (70) and the thread (72), and the diameter (D74) of the middle portion is smaller than that of the thread (72) diameter (D72). The diameter (D96) of the inner edge of the annular portion (92) of the retaining flange (9) is smaller than the diameter (D72) of the thread (72).

Description

Conveyor Roller Unit

technical field

The invention relates to a conveyor belt roller device.

Background technique

Conveyor belt roller units generally comprise pulleys and rolling bearings, the roller bearings comprising an outer ring and an inner ring, into which screws are inserted making it possible to fasten the unit to, for example, an electric motor. The screws are usually fixed in the inner ring of the rolling bearing by retaining flanges, as known from patent document US-B-6241257, in order to avoid the loss of the screws during transport of the device before assembly.

In this document, the screw is held by a radial portion of a flange bearing on the radial surface of the screw, the outer diameter of which is greater than the outer diameter of the thread of the screw. Thus, the screw can be removed by axial sliding on the side of the retaining flange and out of the inner ring.

Contents of the invention

The object of the present invention is to solve this drawback by proposing a new conveyor belt roller arrangement capable of retaining the screw in the inner ring of the rolling bearing more reliably than the arrangements known from the prior art.

To this end, the invention relates to a conveyor belt roller assembly comprising a pulley, a rolling bearing comprising an outer ring on which the pulley is mounted and an inner ring into which a fastening screw is inserted, said fastening screw comprising a crest and a thread, the assembly Also included are retaining flanges for retaining screws in the inner ring. The device is characterized in that the retaining flange comprises a cylindrical part into which the tip of the screw is inserted inside, and an annular part extending inwards up to the middle part of the screw between the top and the thread, and the diameter of the middle part is smaller than the diameter of the thread, Wherein the diameter of the inner edge of the annular portion of the flange is smaller than the diameter of the thread.

Thanks to the invention, by locking the screw in each direction of axial movement, the radial portion of the retaining flange prevents the screw from being completely removed from the inner ring of the rolling bearing.

According to an advantageous, but optional aspect of the invention, such a conveyor belt roller arrangement may incorporate one or more of the following features, in any technically permissible combination:

The cylindrical portion of the retaining flange includes a tongue adapted to deform against the middle portion of the screw.

The retaining flange includes webs extending radially outward toward the pulley to form a labyrinth seal.

The cylindrical portion of the retaining flange includes radial projections on its outer surface adapted to exert a contact force against the inner surface of the inner ring.

The protrusions are regularly distributed on the circumference of the cylindrical part of the retaining flange.

The protrusion is formed by deformation of the cylindrical portion of the retaining flange.

The middle area of the screw is formed by the groove separating the crest and threads of the screw.

The middle region of the screw is formed by a cylindrical portion whose length along the longitudinal axis of the screw is at least equal to the length of the top of the screw in the direction of this longitudinal axis.

At the interface between the intermediate portion and the screw portion having a diameter equal to the diameter of the thread, the screw comprises a shoulder adapted to axially oppose the annular portion of the retaining flange.

Rolling bearings are rolling ball bearings.

Description of drawings

The invention will be better understood and other advantages of the invention will become clearer in view of the following description of a conveyor belt roller arrangement provided as a non-limiting example, with reference to the accompanying drawings, in which:

1 is a cross-sectional view of a conveyor belt roller device according to the present invention;

Figure 2 is an enlarged view of detail II in Figure 2;

FIG. 3 is a perspective view of the retaining flange of the device of FIGS. 1 and 2 .

detailed description

A conveyor belt roller arrangement 1 is shown in FIG. 1 . The device comprises a pulley 3 , a rolling bearing 5 , a fastening screw 7 , and a flange 9 for holding the screw 7 relative to the rolling bearing 5 . The fastening screw 7 is designed to allow the fastening of the device 1 eg on an internal combustion engine (not shown).

The device 1 defines a central axis XX'. In the following, the adjectives "axial" and "radial" are used with reference to the axis XX'.

The rolling bearing 5 includes an outer ring 50 on which the pulley 3 is mounted. The rolling bearing 5 also includes an inner ring 52 into which the fastening screw 7 is inserted. The flange 9 makes it possible to hold the screw 7 in the inner ring 52 so that the screw 7 is not lost during transport of the device 1 before tightening.

Between the inner ring 52 and the outer ring 50 are inserted rolling elements, in this example balls 54 . The flange 9 is fixed to the inner ring 52 , the ends of which comprise a housing formed by a radial surface 520 and an axial surface 522 . The flange 9 comprises a cylindrical portion 90 whose circular base is centered around the central axis XX′ of the device 1 . The flange 9 also includes an annular portion 92 abutting against the axial surface 522 , which is planar and perpendicular to the axis XX′.

The cylindrical portion 90 abuts against the radial surface 520 on a protrusion 94 provided on the outer surface 90A of the cylindrical portion 90 . The projections 94 exert a contact force against the radial surface 520 , which ensures, along the axis XX′, the rotational and translational locking of the flange 9 relative to the inner ring 52 . Preferably, the protrusions 94 are regularly distributed on the circumference of the cylindrical portion 90 .

As shown in FIG. 2 , protrusion 94 may be formed by localized outward deformation of cylindrical portion 90 . In an alternative not shown, the protrusion 94 may be formed by a thicker area of the cylindrical portion 90 .

The screw 7 includes a top 70 and a thread 72 . The top 70 is inserted into a cylindrical portion 90 of the flange 9 . When the top 70 is pressed into contact with the annular portion 92 , the screw 7 is retracted in the inner ring 52 and substantially does not protrude from the side 30 of the pulley 3 .

In order to keep the screw 7 inserted in the inner ring 52 , the annular portion 92 extends inwards towards the axis XX′ as far as the middle portion 74 of the screw 7 between the crest 70 and the thread 72 . The diameter D74 of the intermediate portion 74 is smaller than the diameter D72 of the thread 72 , which corresponds to the inner diameter of the tap 524 of the inner ring 52 into which the thread 72 is inserted. In this description, diameter D72 is defined as the largest outer diameter of the screw thread of thread 72 . Annular portion 92 includes an inner edge 96 having a diameter D96 that is smaller than diameter D72 of threads 72 . Thus, the edge 96 protrudes radially towards the inside of the tapping 524 .

Optionally, and as shown in FIG. 1 , the screw 7 includes a non-threaded portion 76 with an outer diameter equal to the outer diameter D72. At the interface of the non-threaded portion 76 and the middle portion 74, the shoulder 78 oriented towards the top 70 prevents the removal of the screw 7, because the axis XX' on the side of the screw 7 along the top 70, at the direction of the arrow F1 Shoulder 78 is axially blocked by inner edge 96 of flange 9 in the event of movement in the direction .

For some applications, the screw 7 must be partially removable from the inner ring 52 while the screw is retracted in the inner ring 52 , while remaining fixed to the inner ring 52 so as to be able to be manipulated by the operator. Free axial movement of the screw 7 must allow sufficient axial travel for the screw 7 to be able to be retracted. To this end, the middle portion 74 has a length L74 considered along the axis XX′ at least equal to the length L70 of the top 70 considered along the same axis. This allows the screw 7 to slide along the axis XX' between the retracted position shown in FIGS. 1 and 2 and the deployed position in which the top 70 can be grasped by the operator.

According to an alternative aspect of the invention shown in FIG. 3 , the inner edge 96 of the flange 9 is formed by a tongue 98 adapted to deform against the middle portion 74 . This allows the annular portion 92 to exert less elastic force on the screw 7 in order to exert resistance against the axial sliding of the screw 7 . The resistance must be sufficient to prevent premature or accidental removal of the screw 7 from the inner race 52 and low enough to allow the operator to remove the screw 7 without too much force. Here, the inner edge 96 is formed by the engagement of the free edges of the tongues 98 .

According to a non-illustrated embodiment of the invention, the edge 96 of the radial portion 12 may be continuous and rounded.

According to an optional aspect of the invention, the retaining flange 9 comprises a web 100 extending radially towards the outside of the device, towards the pulley 3 . This connecting plate 100 extends near the inner part 32 of the pulley 100 and forms a labyrinth seal able to reduce the ingress of particles towards the inside of the device 1 .

According to a not shown embodiment of the invention, the middle part 74 of the screw 7 can be formed by a groove separating the crest and the thread, the inner diameter of which groove is substantially equal to the inner diameter of the inner edge 96 of the flange 9 . In this case, the possibility of sliding the screw 7 along the axis XX' is limited.

According to another not shown embodiment of the invention, the rolling bearing 5 may comprise rolling elements other than balls 54, such as rollers or needles.

Features of the embodiments and alternatives described above may be combined to form new embodiments of the invention.

Claims (10)

1. A conveyor belt roller device (1), comprising a pulley (3), a rolling bearing (5), said rolling bearing comprising an outer ring (50) on which said pulley (3) is mounted, and a fastening screw (7) an inner ring (52) inserted therein, said fastening screw comprising a crest (70) and a thread (72), said device also comprising a retainer for retaining said screw (7) in said inner ring (52) Flange (9), characterized in that said retaining flange (9) comprises a cylindrical portion (90) into which the top (70) of said screw (7) is inserted inside, and extends inwards until it is located at said top (70) and the annular portion (92) of the middle part of the screw (7) between the thread (72), and the diameter (D74) of the middle part is smaller than the diameter (D72) of the thread (72) ), and wherein the diameter (D96) of the inner edge (96) of the annular portion (92) of the retaining flange (9) is smaller than the diameter (D72) of the thread (72). 2. Device according to claim 1, characterized in that said cylindrical portion (92) of said retaining flange (9) comprises said intermediate portion (74) adapted to rest against said screw (7) Deformed tongue (98). 3. Device according to claim 1, characterized in that said retaining flange (9) comprises webs (100) extending radially outwards towards said pulley (3) in order to form a labyrinth seal. 4. Device according to claim 1, characterized in that said cylindrical portion (90) of said retaining flange (9) comprises radial projections (94) on its outer surface (90a), It is adapted to exert a contact force against the inner surface (520) of said inner ring (52). 5. Device according to claim 4, characterized in that said protrusions (94) are regularly distributed on the circumference of said cylindrical portion (90). 6. Device according to claim 4, characterized in that said protrusion (94) is formed by deformation of said cylindrical portion (90). 7. The device according to claim 1, characterized in that the middle region (74) of the screw (7) is formed by separating the top (70) and the thread (72) of the screw (7). ) groove formation. 8. The device according to claim 1, characterized in that the middle area (74) of the screw (7) is formed by a cylindrical part whose length along the longitudinal axis (X-X') of the screw (7) (L74) is at least equal to the length (L70) of said top (70) of said screw (7) in the direction of the longitudinal axis (X-X'). 9. The device according to claim 8, characterized in that between the middle part (74) and the part (76) of the screw (70) whose diameter is equal to the diameter (D72) of the thread (72) At the interface therebetween, said screw (7) comprises a shoulder (78) adapted to be axially opposed to the annular portion (92) of said retaining flange (9). 10. Device according to any one of claims 1 to 9, characterized in that the rolling bearing (5) is a ball bearing (54).