JP2009270644A - Resin pulley device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin pulley device with a resin pulley integrally formed on the outer periphery of the outer ring of a rolling bearing with injection molding, for preventing the axial displacement of the resin pulley while securing the heat dissipation of the rolling bearing. <P>SOLUTION: A peripheral groove 17 is formed near one end of the outer peripheral face of the outer ring 13 of the rolling bearing 11, and an annular retaining ring 18 is fitted to the peripheral groove 17. The retaining ring 18 is embedded in a boss portion 23 of the resin pulley 21 integrally formed on the outer periphery of the outer ring 13. The embedded retaining ring 18 serves as an engaging means for engaging with the boss portion 23 to prevent the axial displacement of the resin pulley 21. The axial displacement of the resin pulley 21 is reliably prevented. The resin pulley 21 is integrally formed so that both end faces of the outer ring 13 are exposed thereto to ensure heat dissipation when the inner peripheral face of the boss portion 23 corresponds to the outer peripheral face of the outer ring 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a resin pulley apparatus in which a resin pulley is integrally formed on the outer periphery of an outer ring of a rolling bearing by injection molding.

  Conventionally, automobile idler pulleys and compressor pulleys have been made of metal. However, in order to meet the demands for reducing the size and weight of automobile parts and reducing costs, resin pulleys are integrated with the outer periphery of the outer ring of a rolling bearing by injection molding. More and more resin pulley devices have been used.

  In many cases, this type of resin pulley apparatus is such that the boss portion of the resin pulley is integrated with the outer periphery of the outer ring by injection molding so as to hold both end faces of the outer ring, and the resin pulley is prevented from shifting in the axial direction. In this resin pulley device, the boss portion of the resin pulley covers the outer peripheral portion of both end faces of the outer ring, so heat dissipation is worse than a bearing with a metal pulley employing a metal pulley, and the bearing temperature becomes relatively high. There is an easy problem.

  In order to solve this problem, in the resin pulley device, a resin pulley is integrated on the outer periphery of the outer ring by injection molding, and a through-hole penetrating in the radial direction is formed in the resin pulley. Distribute heat to the air in the through-holes (see Patent Document 1) and resin pulleys that are integrated so as to hold both end faces of the outer ring. And a plurality of resin pulleys have been proposed that have increased heat dissipation by increasing the surface area of the side surface of the resin pulley (see Patent Document 2).

  Furthermore, a metal plate for heat dissipation consisting of a cylindrical part that fits the inner peripheral part of the boss part of the resin pulley and a flange that covers one end surface of the resin pulley is integrated into the resin pulley by press fitting, and the heat of the rolling bearing is used for heat dissipation. Sealing between the end faces of the inner and outer rings of a rolling bearing fitted with a resin pulley by press fitting into a metal plate (see Patent Document 3) In addition, there has been proposed one in which a part of the rubber material of the seal member is removed and the cored bar is exposed to the outside to improve heat dissipation (see Patent Document 4).

JP 2002-227972 A JP 2004-308840 A JP 2001-355711 A JP 2005-297712 A

  In the resin pulley device described in Patent Document 1, the resin pulley is integrated by injection molding so as to be an interference fit with the outer peripheral portion of the outer ring, thereby preventing the axial displacement of the resin pulley (Patent Document 1). 1). For this reason, if the heat dissipation from the through hole is not sufficiently performed, the coupling strength between the outer ring and the resin pulley decreases due to the difference in the thermal expansion coefficient between the metal and the resin accompanying the temperature rise of the bearing, and the resin pulley is axially May be misaligned.

  Moreover, in the resin pulley apparatus of patent document 2, the connection arm which connects the boss | hub part and outer peripheral part of a resin pulley is provided over the perimeter. For this reason, the heat generated by the bearing heat is likely to be stored in the connecting arm of the resin pulley via the outer ring, and heat dissipation by the convex portions on the side surface of the resin pulley is insufficient.

  In the resin pulley device described in Patent Document 3, since the periphery of the cylindrical portion of the metal plate for heat dissipation is covered with the boss portion of the resin pulley, heat conduction from the cylindrical portion to the flange is not sufficiently performed, Heat is easily stored in the boss, and heat dissipation by the flange is insufficient.

  In the resin pulley device described in Patent Document 4, heat generated in the bearing is radiated from the core metal exposed to the outside in the bearing, but no heat radiating means is provided for heat transmitted to the resin pulley through the outer ring. For this reason, heat is stored in the resin pulley, and there is a possibility that the heat radiation of the bearing is not sufficiently performed. As a result, as in the case of Patent Document 1, there is a problem that the coupling strength between the outer ring and the resin pulley is lowered, and the resin pulley is displaced in the axial direction.

  Accordingly, an object of the present invention is to provide a resin pulley device that prevents the positional displacement of the resin pulley in the axial direction while ensuring heat dissipation of the rolling bearing.

  In order to achieve the above object, the present invention provides a resin pulley apparatus in which a resin pulley is integrally formed on the outer periphery of an outer ring of a rolling bearing by injection molding, wherein the outer ring has an engaging means for engaging the resin pulley. The resin pulley is integrated so that the inner peripheral surface thereof coincides with the outer peripheral surface of the outer ring and both end surfaces of the outer ring are exposed, and the resin pulley is axially formed with respect to the outer ring by the engaging means. It is possible to adopt a configuration in which the displacement is prevented.

  In this way, since the resin pulley is prevented from being displaced in the axial direction by the engaging means of the outer ring, it is not necessary to integrate the resin pulley so that both end faces are held on the outer diameter surface of the outer ring. For this reason, the resin pulley can be integrated so that its inner peripheral surface coincides with the outer peripheral surface of the outer ring and both end surfaces of the outer ring are exposed, and heat dissipation is ensured at both end surfaces of the exposed outer ring. Can do.

  As the engaging means for engaging the resin pulley of the outer ring, various configurations can be considered. For example, the outer ring has a retaining ring that fits in a circumferential groove formed in the outer peripheral portion thereof, and the retaining ring is The engagement means, the outer ring has a radially outward flange formed at one end of the outer periphery thereof, and the flange is the engagement means, or the outer ring is an outer periphery thereof It is possible to employ one having a circumferential groove formed on the surface and the circumferential groove serving as the engagement means.

  If the retaining ring is an engagement means, the resin pulley is integrated with the outer ring in a state where the retaining ring is embedded in the resin pulley. Axial displacement is reliably prevented.

  By preventing the displacement of the resin pulley, it is not necessary to integrate both ends of the outer ring at the inner peripheral part of the resin pulley, and the inner peripheral surface of the resin pulley matches the outer peripheral surface of the outer ring. It is possible to integrate the resin pulley so that both end faces of the are exposed. As a result, heat dissipation can be ensured by the exposed end faces of the outer ring.

  Further, when the flange is an engagement means, the resin pulley is integrated with the outer ring in a state in which the flange is embedded in the resin pulley, as in the case where the retaining ring is an engagement means. The flange and the resin pulley engage with each other, so that the axial displacement of the resin pulley is reliably prevented.

  Since the displacement of the resin pulley is prevented, the inner surface of the resin pulley coincides with the outer surface of the outer ring, and both end surfaces of the outer ring are exposed, as in the case where the retaining ring is used as the engaging means. Thus, the resin pulley can be integrated. As a result, heat dissipation can be ensured by the exposed end faces of the outer ring.

  In the case where the circumferential groove is an engagement means, the resin pulley is integrated with the outer ring while the resin pulley is embedded in the circumferential groove, so the circumferential groove and the resin embedded in the circumferential groove The resin of the pulley is engaged and the axial displacement of the resin pulley is reliably prevented.

  Since the displacement of the resin pulley is prevented, the inner surface of the resin pulley coincides with the outer surface of the outer ring, and both end surfaces of the outer ring are exposed, as in the case where the retaining ring is used as the engaging means. Thus, the resin pulley can be integrated. As a result, heat dissipation can be ensured by the exposed end faces of the outer ring.

  The retaining ring or the flange may have a groove into which the resin pulley bites. If it does in this way, not only prevention of the position shift of the resin pulley in the axial direction but also resistance to relative rotation (creep) of the resin pulley with respect to the outer ring can be improved.

  In addition, when the circumferential groove is an engaging means, the groove wall of the circumferential groove can be a rough surface that can prevent the resin pulley from creeping in order to prevent the creep. Thereby, the resin pulley can be bitten into the groove to prevent the resin pulley from creeping.

  As described above, in the resin pulley device of the present invention, the resin pulley is prevented from being displaced in the axial direction by the engaging means with which the resin pulley of the outer ring is engaged, and the resin pulley exposes both end faces of the outer ring. Thus, heat dissipation of the rolling bearing is ensured. For this reason, the high temperature of the axial bearing can be suppressed, and the life of the bearing can be extended.

Hereinafter, a resin pulley apparatus according to a first embodiment of the present invention will be described with reference to the accompanying drawings.
The resin pulley apparatus shown in FIG. 1 is obtained by integrally molding a resin pulley 21 on the outer periphery of an outer ring 13 of a rolling bearing 11 by injection molding.

  In the rolling bearing 11, a plurality of balls 14 are held between an inner ring 12 and an outer ring 13 by a cage 15 so as to be able to roll, and shield plates 16 are provided for sealing both end faces of the inner ring 12 and the outer ring 13. ing. The rolling bearing 11 is not limited to a deep groove ball bearing as shown in FIG. 1, and for example, a known rolling bearing such as an angular ball bearing, a cylindrical roller bearing, or a tapered roller bearing can be applied.

  The outer ring 13 of the rolling bearing 11 has a circumferential groove 17 formed near one end of the outer peripheral surface, and has an annular retaining ring 18 that fits into the circumferential groove 17. The circumferential groove 17 is a rectangular groove having a rectangular cross section, and a retaining ring 18 fitted in the circumferential groove 17 protrudes from the outer circumferential surface of the outer ring 13. The cross-sectional shape of the circumferential groove 17 is not limited to a rectangle, and for example, a V shape, an arc shape, or the like can be adopted. However, a rectangle in which the retaining ring 18 can be fitted stably is preferable.

  A resin pulley 21 is integrated with the outer periphery of the outer ring 13 of the rolling bearing 11 by injection molding. The resin pulley 21 is integrally formed with a boss portion 23 integrated on the outer periphery of the outer ring 13, an outer peripheral portion 22 around which a belt (not shown) is wound, and a connecting portion 24 that connects the boss portion 23 and the outer peripheral portion 22. It has been done. The boss portion 23 has a cylindrical inner peripheral surface.

  When the resin pulley 21 is integrated with the outer periphery of the outer ring 13, the retaining ring 18 is embedded in the boss portion 23. The embedded retaining ring 18 is engaged with the boss portion 23 to serve as an engaging means for preventing the resin pulley 21 from shifting in the axial direction, so that the positional displacement of the resin pulley 21 in the axial direction is reliably prevented.

  By preventing the displacement of the resin pulley 21, it is not necessary to integrate the both ends of the outer ring 13 with the boss portion 23 of the resin pulley 21, and as shown in FIG. The resin pulley 21 can be integrated so that the surface coincides with the outer peripheral surface of the outer ring 13 and both end surfaces of the outer ring 13 are exposed. As a result, it is possible to ensure heat dissipation by the exposed both end faces of the outer ring 13.

  Further, as the rolling bearing 11 having the retaining ring 18 on the outer ring 13, a standard bearing whose nominal number is standardized by JISB1513, for example, a bearing with an outer ring retaining ring (track ring shape number: NR (with retaining ring)) is adopted. be able to.

  In this case, since a standard product can be used as the rolling bearing 11, it is easy to obtain the rolling bearing. For this reason, when manufacturing the resin pulley device, there is no need to add a step of processing a circumferential groove in the outer ring, a step of fitting a retaining ring into the peripheral groove, and the like, and the resin pulley device can be manufactured at low cost.

  Furthermore, a groove can be formed on the surface of the retaining ring 18 that fits in the circumferential groove 17 of the outer ring 13. This groove is a number of slit grooves or grooves such as knurls. By causing the resin of the boss portion 23 of the resin pulley 21 to bite into the groove and increasing the frictional resistance between the outer ring 13 and the resin pulley 21, the resistance to creep can be improved.

A second embodiment of the present invention will be described with reference to FIG.
The resin pulley device according to the second embodiment is common to the resin pulley device of the first embodiment described above in that the resin pulley 21 is integrally formed on the outer periphery of the outer ring 13 of the rolling bearing 11 by injection molding. The shape of the outer ring 13 of the rolling bearing 11 is different. Other configurations are the same as those in the first embodiment, and the description is omitted by using the same reference numerals for the same configurations.

  In this embodiment, the outer ring 13 of the rolling bearing 11 has a radially outward flange 19 formed at one end of the outer peripheral portion. When the resin pulley 21 is integrated with the outer periphery of the outer ring 13, the flange 19 is embedded in the resin pulley 21. The embedded flange 19 is engaged with the boss portion 23 to serve as an engagement means for preventing the resin pulley 21 from shifting in the axial direction, and the axial displacement of the resin pulley 21 is reliably prevented.

  By preventing the displacement of the resin pulley 21, as shown in FIG. 2, the resin pulley 21 so that the inner peripheral surface of the boss portion 23 coincides with the outer peripheral surface of the outer ring 13 and both end surfaces of the outer ring 13 are exposed. Can be integrated. As a result, heat dissipation can be ensured by the exposed end faces of the outer ring 13.

  As the rolling bearing 11 having the flange 19 on the outer ring 13, a standard bearing whose nominal number is standardized by JISB1513, for example, a bearing with an outer ring flange (ring ring shape number: F (with flange)) may be adopted. In this case, since a standard product can be used as the rolling bearing 11, it becomes easy to obtain the rolling bearing and the resin pulley device can be manufactured at a low cost.

  Further, a groove can be formed on the surface of the flange 19 of the outer ring 13. This groove is a large number of slit grooves or grooves such as knurls, and the boss portion 23 bites into the groove, whereby the frictional resistance between the outer ring 13 and the resin pulley 21 is increased, and the resistance to creep can be improved.

A third embodiment of the present invention will be described with reference to FIG.
The resin pulley device according to the third embodiment is common to the resin pulley device of the first embodiment described above in that the resin pulley 21 is integrally formed on the outer periphery of the outer ring 13 of the rolling bearing 11 by injection molding. The difference is that the outer ring 13 of the rolling bearing 11 does not have the retaining ring 18. Other configurations are the same as those in the first embodiment, and the description is omitted by using the same reference numerals for the same configurations.

  In this embodiment, a circumferential groove 17 is formed in the outer ring 13 of the rolling bearing 11. When the resin pulley 21 is integrated with the outer periphery of the outer ring 13, the resin of the boss portion 23 is embedded in the circumferential groove 17. The circumferential groove 17 is engaged with the boss portion 23 to serve as an engaging means that prevents the resin pulley 21 from shifting in the axial direction, and reliably prevents the positional displacement of the resin pulley 21 in the axial direction.

  By preventing the displacement of the resin pulley 21, as shown in FIG. 3, the resin pulley 21 so that the inner peripheral surface of the boss portion 23 coincides with the outer peripheral surface of the outer ring 13 and both end surfaces of the outer ring 13 are exposed. Can be integrated. As a result, heat dissipation can be ensured by the exposed end faces of the outer ring 13.

  Further, the groove wall of the circumferential groove 17 can be a rough surface that can prevent the resin pulley 21 from creeping. By embedding the resin of the boss portion 23 in the circumferential groove 17, the frictional resistance between the rough surface of the groove wall and the resin of the resin pulley 21 is increased, and the resistance to creep can be improved.

  Further, as the rolling bearing 11 in which the outer ring 13 is formed with the circumferential groove 17, a standard bearing whose nominal number is standardized by JISB1513, for example, a bearing with an outer ring groove (track ring shape number: N (with ring groove)) is adopted. May be. In this case, as in the first embodiment, a standard standard product can be used as the rolling bearing 11, so that the resin pulley device can be manufactured at low cost.

The longitudinal cross-sectional view of the resin pulley apparatus which concerns on 1st Embodiment Vertical sectional view of a resin pulley device according to a second embodiment Vertical sectional view of a resin pulley device according to a third embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Rolling bearing 12 Inner ring 13 Outer ring 14 Ball 15 Cage 16 Shield plate 17 Circumferential groove 18 Retaining ring 19 Flange 21 Resin pulley 22 Outer peripheral part 23 Boss part 24 Connecting part

Claims (7)

In a resin pulley apparatus in which a resin pulley (21) is integrally formed by injection molding on the outer periphery of an outer ring (13) of a rolling bearing (11),
The outer ring (13) has engagement means with which the resin pulley (21) is engaged, and the resin pulley (21) has an inner peripheral surface that coincides with an outer peripheral surface of the outer ring (13), and The resin pulley is integrated so that both end faces of the outer ring (13) are exposed, and the resin pulley (21) is prevented from being displaced in the axial direction with respect to the outer ring (13) by the engaging means. apparatus.   The outer ring (13) has a retaining ring (18) that fits in a circumferential groove (17) formed on the outer periphery thereof, and the retaining ring (18) serves as the engaging means, and the retaining ring (18) The resin pulley device according to claim 1, wherein the resin pulley (21) is integrated with the outer ring (13) in a state where the resin pulley (21) is embedded in the resin pulley (21).   The outer ring (13) has a radially outward flange (19) formed at one end of the outer peripheral portion thereof, the flange (19) serves as the engagement means, and the flange (19) serves as the resin. The resin pulley apparatus according to claim 1, wherein the resin pulley (21) is integrated with the outer ring (13) while being embedded in the pulley (21).   The outer ring (13) has a circumferential groove (17) formed in an outer peripheral portion thereof, and the circumferential groove (17) serves as the engaging means, and the resin pulley (21) is inserted into the circumferential groove (17). The resin pulley apparatus according to claim 1, wherein the resin pulley (21) is integrated with the outer ring (13) in a state where resin is embedded.   3. The resin pulley apparatus according to claim 2, wherein the retaining ring (18) has a groove into which the resin pulley (21) bites on a surface thereof.   The resin pulley apparatus according to claim 3, wherein the flange (19) has a groove into which the resin pulley (21) bites on a surface thereof.   The resin pulley apparatus according to claim 4, wherein a groove wall of the circumferential groove (17) of the outer ring (13) is a rough surface capable of preventing creep of the resin pulley (21).

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