JP2009030768A - Bearing with resin pulley - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure the heat-radiability of a bearing and surely prevent a resin pulley from being axially displaced. <P>SOLUTION: A metal ring-shaped member 5 with high heat conductivity which has a ring part 5a having an annular surface S in continuous with the end surface outer diameter side of the outer ring 2 is fitted to each of both ends of the outer diameter surface of the outer ring 2. The resin pulley 4 is so formed integrally that the entire parts of the end surfaces of the outer ring 3 and the annular surfaces S of the ring parts 5a are exposed. Since the end surfaces of the outer ring 2 and the annular surfaces S of the ring parts 5a not covered with resin are formed in wide heat-radiating surfaces, the heat-radiability of the bearing can be secured. Also, the resin pulley 4 is prevented from being axially displaced by the ring parts 5a of the ring-shaped members 5 fitted to both ends of the outer diameter surface of the outer ring 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bearing with a resin pulley in which a resin pulley is integrated with a rolling bearing.

  A bearing with a resin pulley in which a resin pulley is integrated on the outer periphery of the outer ring of a rolling bearing is formed by integrating a resin pulley on the outer diameter surface of the outer ring so that the base of the resin pulley holds both ends of the outer ring by injection molding. Many pulleys are offset in the axial direction (see, for example, Patent Document 1). In such a bearing with a resin pulley, the bond strength between the outer ring and the resin pulley decreases due to the difference in the coefficient of thermal expansion between the metal and the resin due to the temperature rise of the bearing, and the creep that causes the resin pulley to rotate relative to the circumferential direction is reduced. May occur.

  As means for preventing such creep of the resin pulley, means for forming two circumferential grooves extending in the circumferential direction on the outer diameter surface of the outer ring and inclined in opposite directions in the depth direction (see, for example, Patent Document 2) ), Means for forming a circumferential groove that extends in the circumferential direction on the outer diameter surface of the outer ring and whose width and depth change in the circumferential direction (see, for example, Patent Document 3), provided on the outer diameter surface of the outer ring Means for forming irregularities on the bottom surface of the circumferential groove by knurling or the like (for example, see Patent Document 4), means for forming a spiral groove on the outer diameter surface of the outer ring (for example, see Patent Document 5), and the like have been proposed.

  In the one described in Patent Document 5, the outer ring has a width dimension larger than that of the inner ring, the base of the resin pulley is brought into contact with the outer diameter surface of the outer ring and the chamfered portions on both sides thereof, and the base of the resin pulley There is also proposed a form in which a resin pulley is integrated with the outer diameter surface of the outer ring without holding both end faces.

Japanese Patent Laid-Open No. 7-28259 JP 2002-372131 A JP 2003-65424 A Japanese Patent Laid-Open No. 11-148550 JP 2003-207032 A

As described in Patent Documents 1 to 4, a bearing with a resin pulley in which a resin pulley is integrated with an outer diameter surface of an outer ring so that a base portion of the resin pulley holds both end surfaces of the outer ring is made of metal around the outer ring. However, since it is covered with a resin having a remarkably low thermal conductivity, heat dissipation is poor, and there is a problem that the bearing temperature increases due to heat storage. Moreover, since the intensity | strength of resin which contacts this will fall when bearing temperature becomes high, the effect of the creep prevention means mentioned above also falls.
As described in Patent Document 5, the bearing with the resin pulley in which the width of the outer ring is larger than that of the inner ring and the both ends of the outer ring are not held at the base of the resin pulley can ensure heat dissipation to some extent. However, since the base portion of the resin pulley is only locked in the axial direction by the chamfered portions at both ends of the outer ring, there is a problem that the resin pulley is easily displaced in the axial direction.

  Accordingly, an object of the present invention is to ensure heat dissipation of the bearing and to reliably prevent the displacement of the resin pulley in the axial direction.

  In order to solve the above problems, the present invention provides a bearing with a resin pulley in which a resin pulley is integrated with an outer periphery of an outer ring of a rolling bearing, and an outer diameter side of an end surface of the outer ring at an end of the outer diameter surface of the outer ring. A metal ring-shaped member having a ring portion that forms an annular surface that is connected to the outer ring is fitted, and the resin pulley is integrated so that the end surface of the outer ring and the entire annular surface of the ring portion are exposed. did.

  That is, a metal ring-shaped member having a ring portion that forms an annular surface connected to the outer diameter side of the end surface of the outer ring is fitted to the end portion of the outer diameter surface of the outer ring, and the end surface of the outer ring and the annular surface of the ring portion By integrating the resin pulley so that the entire surface of the outer ring is exposed, the end surface of the outer ring that is not covered with resin and the annular surface of the ring portion can be widened to ensure heat dissipation of the bearing, and the outer ring The ring portion of the ring-shaped member fitted to the end portion of the outer diameter surface of the resin pulley can prevent the resin pulley from shifting in the axial direction.

  By fitting the ring-shaped member to both end portions of the outer diameter surface of the outer ring and forming an annular surface continuous to the outer diameter side of both end surfaces of the outer ring, it is possible to prevent the resin pulley from shifting in both axial directions. At the same time, the heat dissipation surface can be made wider.

  A ring-shaped member forming an annular surface connected to the outer diameter side of both end faces of the outer ring is externally fitted to the outer diameter surface of the outer ring, and is integrally connected with a cylindrical portion formed thinner than the ring portion. By doing so, positioning and fitting of a ring-shaped member can be performed easily.

  The ring-shaped member that is continuous with the cylindrical portion can be formed by cutting a pipe material.

  The ring-shaped member that is integrally connected to the cylindrical portion can be formed by pressing a plate material.

  The ring-shaped member can be fitted to the outer diameter surface of the outer ring by press-fitting.

  The ring-shaped member may be fitted to the outer diameter surface of the outer ring by projection welding.

  It is desirable to provide means for preventing creep of the resin pulley on the outer diameter surface of the outer ring or the ring-shaped member.

  The bearing with a resin pulley according to the present invention has a metal ring-like member having a ring portion that forms an annular surface connected to the outer diameter side of the end surface of the outer ring fitted to the end portion of the outer diameter surface of the outer ring. Since the resin pulley is integrated so as to expose the end face and the entire annular surface of the ring portion, the heat dissipation of the bearing can be ensured and the displacement of the resin pulley in the axial direction can be reliably prevented.

  By fitting the ring-shaped member to both ends of the outer diameter surface of the outer ring and forming an annular surface connected to the outer diameter side of both end surfaces of the outer ring, it is possible to prevent displacement of the resin pulley in both axial directions, The heat radiation surface can be made wider.

  A ring-shaped member that forms an annular surface that is continuous with the outer diameter side of both end faces of the outer ring is externally fitted to the outer diameter surface of the outer ring, and is integrally connected with a cylindrical portion that is thinner than the ring portion. Thus, the ring-shaped member can be easily positioned and fitted.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment. This bearing with a resin pulley is a resin pulley provided with a groove 4a for winding a V-belt (not shown) around an outer ring 2 of a ball bearing as a rolling bearing in which a plurality of balls 3 are arranged between an inner ring 1 and an outer ring 2. 4 is integrated by injection molding, and both ends of the outer diameter surface of the outer ring 2 have a ring portion 5a that forms an annular surface S connected to the outer diameter side of the end surface of the outer ring 2, and has high thermal conductivity. A metal ring-shaped member 5 is fitted by press-fitting.

  The outer diameter surface of the outer ring 2 is knurled (not shown) as means for preventing creep of the resin pulley 4, and the base portion 4b of the resin pulley 4 is formed between the end surface of the outer ring 2 and the annular surface S of the ring portion 5a. The whole is integrated with the outer periphery of the outer ring 2 so as to be exposed as a heat radiating surface, and is prevented from shifting in both axial directions by the ring portions 5a on both sides.

  FIG. 2 shows a second embodiment. In this bearing with a resin pulley, the ring-shaped member 5 is integrally connected to the ring portions 5a on both sides by a cylindrical portion 5b that is fitted on the outer diameter surface of the outer ring 2 and is thinner than the ring portion 5a. It is supposed to be. The ring-shaped member 5 is formed by cutting a pipe material, and a spiral groove 6 is provided on the outer diameter surface of the cylindrical portion 5b as a means for preventing the resin pulley 4 from creeping. The other parts are the same as those in the first embodiment, and the ring-shaped member 5 connected integrally is fitted to the outer diameter surface of the outer ring 2 by press-fitting.

  FIG. 3 shows a third embodiment. Similarly to the second embodiment, the bearing with the resin pulley is such that the ring-shaped member 5 has the ring portions 5a on both sides fitted on the outer diameter surface of the outer ring 2, and is thinner than the ring portion 5a. It is assumed that they are integrally connected by the formed cylindrical portion 5b. The ring-shaped member 5 is formed by pressing a plate material, the ring portions 5a on both sides are formed by flange bending, and the cylindrical portion 5b is fitted to the outer diameter surface of the outer ring 2 by projection welding. Further, the outer diameter surface of the cylindrical portion 5 b is formed as a rough surface as a creep preventing means for the resin pulley 4. Other parts are the same as those of the first embodiment.

  In each of the embodiments described above, the bearing is a ball bearing and the resin pulley is for a V-belt, but the type of the bearing and the resin pulley is not limited to that of the embodiment, and any type can be used. Can be adopted. Moreover, although the resin pulley was integrated with the outer ring by injection molding, the resin pulley may be integrated with the outer ring by other molding methods such as compression molding.

Longitudinal front view showing a bearing with a resin pulley of the first embodiment Longitudinal front view showing a bearing with a resin pulley of the second embodiment Longitudinal front view showing a bearing with a resin pulley of the third embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 3 Ball 4 Resin pulley 4a Groove 4b Base part 5 Ring-shaped member 5a Ring part 5b Cylindrical part 6 Spiral groove

Claims (8)

  In a bearing with a resin pulley in which a resin pulley is integrated with an outer periphery of an outer ring of a rolling bearing, a metal part having a ring portion that forms an annular surface that is continuous with the outer diameter side of the end surface of the outer ring at the end portion of the outer diameter surface of the outer ring. A bearing with a resin pulley, wherein the resin pulley is integrated so that an end surface of the outer ring and the entire annular surface of the ring portion are exposed.   The bearing with a resin pulley according to claim 1, wherein the ring-shaped member is fitted to both end portions of the outer diameter surface of the outer ring to form an annular surface that is continuous with the outer diameter side of both end surfaces of the outer ring.   A ring-shaped member forming an annular surface connected to the outer diameter side of both end faces of the outer ring is externally fitted to the outer diameter surface of the outer ring, and is integrally connected with a cylindrical portion formed thinner than the ring portion. The bearing with a resin pulley according to claim 2.   The bearing with a resin pulley according to claim 3, wherein the ring-shaped member integrally connected at the cylindrical portion is formed by cutting a pipe material.   The bearing with a resin pulley according to claim 3, wherein the ring-shaped member integrally connected at the cylindrical portion is formed by pressing a plate material.   The bearing with a resin pulley according to any one of claims 1 to 5, wherein the ring-shaped member is fitted on an outer diameter surface of the outer ring by press-fitting.   The bearing with a resin pulley according to any one of claims 1 to 5, wherein the ring-shaped member is fitted to an outer diameter surface of the outer ring by projection welding.   The bearing with a resin pulley according to any one of claims 1 to 7, wherein means for preventing creep of the resin pulley is provided on an outer diameter surface of the outer ring or the ring-shaped member.

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