JP2009030767A - 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 flange 2a so overhanging to the outer diameter side as to enlarge the diameter of the end surface S of an outer ring 2 is formed at 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 part of the diameter-enlarged end surfaces S of the outer ring 2 are exposed. Since the diameter-enlarged end surfaces S of the outer ring 2 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 flanges 2a overhanging from the 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 with the outer diameter surface of the outer ring so that the base of the resin pulley holds both end faces 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, there is a problem in that heat dissipation is poor and 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 expands an end surface of the outer ring to an end portion of the outer diameter surface of the outer ring. In this way, a configuration is adopted in which a flange protruding to the outer diameter side is provided, and the resin pulley is integrated so as to expose the entire end face of the expanded outer ring.

  That is, a flange protruding to the outer diameter side is provided at the end of the outer diameter surface of the outer ring so as to expand the end surface of the outer ring, and the resin pulley is integrated so as to expose the entire end surface of the expanded outer ring. As a result, the end surface of the expanded outer ring that is not covered with resin is made a wide heat radiating surface, so that the heat dissipation of the bearing can be ensured, and the shaft of the resin pulley is extended by the flange protruding from the end of the outer surface of the outer ring. The shift in the direction can be prevented.

  By providing the flanges at both ends of the outer diameter surface of the outer ring and expanding the both end surfaces of the outer ring, the resin pulley can be prevented from shifting in both axial directions, and the heat dissipation surface can be made wider. .

  A resin pulley is formed by forming at least one of the outer diameter surface of the outer ring, the outer diameter surface of the flange, and the inner surface in the axial direction of the flange with a rough surface, or by knurling at least one of these surfaces. Creeping can be prevented.

  By providing a spiral groove or a circumferential groove whose cross-sectional dimension is changed in the circumferential direction on the outer diameter surface of the outer ring, the resin pulley can be prevented from creeping.

  It is also possible to prevent the resin pulley from creeping by providing a notch groove extending in the axial direction on the outer diameter surface of the flange.

  It is also possible to prevent the resin pulley from creeping by providing an axially extending fin on the inner side surface of the flange.

  The bearing with the resin pulley of the present invention is provided with a flange protruding to the outer diameter side so as to expand the end surface of the outer ring at the end of the outer diameter surface of the outer ring so that the entire end surface of the expanded outer ring is exposed. Since the resin pulley is integrated, the heat dissipation of the bearing can be ensured and the axial displacement of the resin pulley can be reliably prevented.

  By providing the flanges at both ends of the outer diameter surface of the outer ring and enlarging the both end surfaces of the outer ring, the displacement of the resin pulley in both axial directions can be prevented, and the heat dissipation surface can be made wider.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show 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 are provided with flanges 2a that project to the outer diameter side so as to expand the end surface S of the outer ring 2.

  The outer diameter surface of the outer ring 2, the outer diameter surface of each flange 2a, and the inner surface in the axial direction are formed in a rough surface to prevent the resin pulley 4 from creeping, and the base 4b of the resin pulley 4 is expanded in diameter. The outer ring 2 is integrated with the outer periphery of the outer ring 2 so that the entire end surface S is exposed as a heat radiating surface, and the flanges 2a at both ends of the outer diameter surface of the outer ring 2 are prevented from shifting in both axial directions.

  3 and 4 show a second embodiment. This bearing with a resin pulley has the same basic configuration as that of the first embodiment, and the creep prevention means of the resin pulley 4 is an axially extending cut provided on the outer diameter surface of each flange 2a. The difference is that it is a notch groove 5. In this embodiment, the notch grooves 5 are provided at four locations in the circumferential direction, but the notch grooves 5 may be provided at one or more locations.

  5 and 6 show a third embodiment. The basic structure of the bearing with the resin pulley is the same as that of the first embodiment, and the creep prevention means of the resin pulley 4 is a fin 6 protruding from the inner side surface of each flange 2a in the axial direction. Is different. In this embodiment, the fins 6 are provided at three locations in the circumferential direction, but the fins 6 may be provided at one or more locations.

  FIG. 7 shows a fourth embodiment. The basic structure of this bearing with a resin pulley is the same as that of the first embodiment, and the creep preventing means of the resin pulley 4 is a spiral groove 7 provided on the outer diameter surface of the outer ring 2. Is different. In addition, you may employ | adopt combining these as the creep prevention means of the resin pulley 4 shown by each embodiment mentioned above.

  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 Side view of FIG. Longitudinal front view showing a bearing with a resin pulley of the second embodiment Side view of FIG. Longitudinal front view showing a bearing with a resin pulley of the third embodiment Side view of FIG. Vertical front view showing a bearing with a resin pulley of a fourth embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 2a 鍔 3 Ball 4 Resin pulley 4a Groove 4b Base part 5 Notch groove 6 Fin 7 Spiral groove

Claims (6)

  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 flange protruding to the outer diameter side is provided at the end of the outer diameter surface of the outer ring so as to expand the end surface of the outer ring, A bearing with a resin pulley, wherein the resin pulley is integrated so as to expose the entire end face of the expanded outer ring.   The bearing with a resin pulley according to claim 1, wherein the flanges are provided at both ends of the outer diameter surface of the outer ring, and both end surfaces of the outer ring are expanded in diameter.   The outer diameter surface of the outer ring, the outer diameter surface of the flange, or the axial inner surface of the flange is formed into a rough surface, or at least one of these surfaces is knurled. 2. A bearing with a resin pulley according to 2.   The bearing with a resin pulley according to any one of claims 1 to 3, wherein a spiral groove or a circumferential groove whose cross-sectional dimension is changed in the circumferential direction is provided on an outer diameter surface of the outer ring.   The bearing with a resin pulley according to any one of claims 1 to 4, wherein a notch groove extending in the axial direction is provided on an outer diameter surface of the flange.   The bearing with a resin pulley according to any one of claims 1 to 5, wherein a fin projecting in the axial direction is provided on an inner side surface of the flange in the axial direction.

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