JP2009191900A - Bearing with resin pulley - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing with a resin pulley reduced in manufacturing cost by easily manufacturing an outer ring of the rolling bearing while preventing the creep of the resin pulley. <P>SOLUTION: The resin pulley 31 is integrated with the outer periphery of the outer ring 13 of the rolling bearing 11. The outer ring 13 is formed cylindrically with a radially outward flange 17 at one end by the press molding of a steel plate. The resin pulley 31 is integrated with the outer periphery of the outer ring 13 in a state that the end face of its boss 32 corresponds to the outer end face of the flange 17. The outer ring 13 formed by the press molding is easily manufactured by plastic working as main work, thus reducing manufacturing cost. The boss 32 of the resin pulley 31 contacts with the inner end face of the flange 17 in the radial direction, so that the bearing force of the resin pulley 31 on a creep can be kept by friction resistance in a radial contact region. <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 an outer periphery of an outer ring of 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 periphery of the outer ring so that the base of the resin pulley holds both ends of the outer ring by injection molding. Are often offset in the axial direction (see, for example, Patent Document 1). In such a bearing with a resin pulley, the coupling strength between the outer ring and the resin pulley decreases due to the difference in thermal expansion coefficient between the metal and the resin as the temperature of the bearing rises, and creep occurs in which the resin pulley rotates relative to the circumferential direction. Sometimes.

  As a means for preventing creep of the resin pulley, a means for forming a circumferential groove in the outer peripheral portion of the outer ring (see, for example, Patent Document 2), the outer peripheral portion of the outer ring extends in the circumferential direction, and its width and depth. Means for forming a circumferential groove that changes in the circumferential direction (for example, see Patent Document 3), means for forming irregularities on the bottom surface of the circumferential groove provided on the outer peripheral portion of the outer ring by knurling (for example, see Patent Document 4) Etc. have been proposed.

Japanese Utility Model Publication No. 7-28259 JP 2004-263800 A JP 2003-65424 A Japanese Patent Laid-Open No. 11-148550

  By the way, the outer ring of the rolling bearing used for the bearing with the resin pulley is formed by forging using a high-strength material capable of withstanding the load applied to the resin pulley. However, as described in Patent Documents 2 to 4, providing the peripheral groove on the outer peripheral portion of the outer ring or performing knurling is troublesome in processing when the outer ring is formed by forging. However, there is a risk that the processing cost becomes high, and the production cost increases accordingly.

  In addition, in Patent Documents 2 to 4, the boss portion of the resin pulley is integrated so that both end faces are held on the outer periphery of the outer ring, and the periphery of the outer ring is covered with a resin having lower thermal conductivity than metal. Therefore, there is a problem that heat dissipation is poor and the bearing temperature increases due to heat storage. Further, since the strength of the resin that comes into contact with the bearing temperature increases as the bearing temperature increases, the effect of the above-described creep prevention means also decreases.

  Therefore, the object of the present invention is to easily manufacture the outer ring of the rolling bearing while preventing the resin pulley from creeping in the bearing with the resin pulley in which the resin pulley is integrally formed by injection molding on the outer periphery of the outer ring of the rolling bearing. It is to reduce the manufacturing cost.

  In order to solve the above-described problems, the present invention provides a bearing with a resin pulley in which a resin pulley is integrally formed by injection molding on the outer periphery of an outer ring of a rolling bearing, wherein the outer ring is formed by press forming of a steel plate and is formed at one end. It has a radially outward flange, and employs a configuration in which the inner peripheral portion of the resin pulley is integrated with the outer periphery of the outer ring so as to cover the outer diameter surface of the flange.

According to this configuration, since the outer ring is formed by press-molding a steel plate, it can be easily manufactured by processing centering on plastic processing, thereby reducing the manufacturing cost.
Further, the inner peripheral portion of the resin pulley comes into contact with the axial inner side surface of the flange, and a radial contact area between the resin pulley and the outer ring is ensured. The resistance against creep of the resin pulley can be maintained by the frictional resistance in the radial contact region.

  In the above configuration, the inner peripheral portion of the resin pulley is formed to have the same axial width as that of the outer ring, and the end surface thereof coincides with the axially outer surface of the flange so as to cover the outer diameter surface of the flange. Can be adopted.

  According to this configuration, the other end surface of the outer ring and the outer end surface (axially outer surface) of the flange are exposed. Using these exposed end faces as heat dissipation surfaces, the heat of the outer ring is efficiently radiated. As a result, the heat dissipation is improved as compared with the case where the boss portion of the resin pulley is integrated with the outer diameter surface of the outer ring so as to hold the both end surfaces of the outer ring, as in the above-mentioned Patent Documents 2 to 4. To do.

The said structure WHEREIN: The structure in which the said flange was formed in the both ends of the said outer ring | wheel can be employ | adopted. When flanges are formed at both ends of the outer ring, the radial contact area increases, and the yield strength of the resin pulley against creep can be improved. Moreover, the strength with respect to the load of the resin pulley applied to the outer ring can be improved by forming the flanges at both ends of the outer ring.
Further, the inner peripheral portion of the resin pulley is formed to have the same axial width as the outer ring, and when adopting a configuration in which the end surface is made to coincide with the outer surface in the axial direction of the flange, the flange formed on both end surfaces of the outer ring Since the outer end surfaces are exposed, the heat dissipation can be further improved.

  Here, when the radial load applied to the resin pulley is relatively large, in order to effectively prevent the resin pulley from creeping, a configuration in which the circumferential frictional resistance between the resin pulley and the outer ring is increased, or Various configurations such as a configuration in which the resin forming the resin pulley is engaged with the outer ring are conceivable. For example, a configuration in which serrations are formed on the outer diameter surface of the flange, and a radial protrusion is formed on the outer diameter surface of the flange. A configuration in which a radial notch is formed in the outer diameter portion of the flange, or a configuration in which an engagement hole in which the resin of the resin pulley is embedded is formed in the flange.

  In the configuration in which serrations are formed on the outer diameter surface of the flange, the resin of the resin pulley bites into the serrations, and the circumferential frictional resistance between the resin pulley and the outer ring can be increased. In the configuration in which the radial protrusion is formed on the outer diameter surface of the flange, the protrusion is locked to the resin of the resin pulley, and this locking can increase the resistance to creep of the resin pulley.

  In a configuration in which a radial notch is formed in the outer diameter portion of the flange, or in a configuration in which an engagement hole in which the resin pulley resin is embedded is formed in the flange, the notch or the engagement hole is provided with a resin pulley. The resin is buried. When the buried resin is engaged with the flange, the resistance of the resin pulley to creep can be increased.

  As described above, according to the present invention, by adopting the above configuration, it is possible to easily manufacture the outer ring of the rolling bearing while preventing the resin pulley from creeping, and to reduce the manufacturing cost.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a first embodiment. In this bearing with a resin pulley, a resin pulley 31 is integrated with the outer periphery of the outer ring 13 of the rolling bearing 11.

  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 the 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 is formed into a cylindrical shape by press forming of a steel plate, and has a radially outward flange 17 at one end, and a raceway 18 is formed on the inner peripheral surface thereof. When the outer ring 13 is formed by press molding, it becomes processing centered on plastic processing, as compared with the case where peripheral grooves and the like are processed in the outer ring formed by forging like those described in Patent Documents 2 to 4. Can be easily manufactured. As a result, the manufacturing cost can be reduced. In addition, the well-known method is applicable for the press forming method of the steel plate which forms the outer ring | wheel 13, and it determines suitably based on experiment and actual operation.

  As shown in FIG. 3, the flange 17 has serrations 19 formed on the outer diameter surface. This serration 19 can, for example, form a plurality of pre-pressed steel plates in a portion that becomes the flange 17, and therefore, compared to the case where a circumferential groove or the like is formed in the outer ring manufactured by forging. The outer ring 13 can be easily manufactured. As a result, the manufacturing cost can be reduced.

  As shown in FIG. 3, the resin of the resin pulley 31 bites into the serration 19 of the flange 17. This resin biting increases the frictional resistance between the resin pulley 31 and the outer ring 13 and improves the creep prevention performance. In addition, when the belt load applied to the resin pulley 31 is relatively small, the serration 19 is not formed on the outer diameter surface of the flange 17, and the resin pulley 31 has a frictional resistance between the outer diameter surface of the flange 17 and the resin pulley 31. You may make it prevent creep. This is because the process of forming the serration 19 is omitted, and the manufacturing cost of the outer ring 13 can be reduced by the omitted process.

  In the resin pulley 31, a boss portion 32 on the inner peripheral portion and an outer peripheral portion 33 having a pulley groove on which a belt (not shown) is hung are integrally formed, and the boss portion 32 has an axial width (axial width) of the outer ring 13. ) And the same axial width. The boss portion 32 is in a state in which both end surfaces thereof coincide with the other end surface of the outer ring 13 and the outer end surface of the flange 17. Thereby, the other end surface of the outer ring 13 and the outer end surface of the flange 17 are exposed.

  Heat that is generated in the rolling bearing 11 and transmitted to the outer ring 13 is radiated by using the exposed end surfaces of the outer ring 13 and the flange 17 as heat radiating surfaces. Thereby, compared with the thing of patent documents 2-4, heat dissipation can be improved.

  Further, the boss portion 32 of the resin pulley 31 is in a state in which both end surfaces thereof coincide with the other end surface of the outer ring 13 and the outer end surface (axially outer surface) of the flange 17, respectively. It will be in the state which the part 32 covers. At this time, the inner end surface (the inner surface in the axial direction) of the flange 17 of the outer ring 13 is brought into contact with the radial direction, and a radial contact region between the resin pulley 31 and the outer ring 13 is ensured.

  With this frictional resistance in the radial contact region, even if the other end surface of the outer ring 13 and the outer end surface of the flange 17 are exposed, it is possible to maintain the resistance to creep of the resin pulley 13. The boss portion 32 of the resin pulley 31 is formed to have the same axial width as that of the outer ring 13. However, as long as it covers the outer peripheral surface of the flange 17, the boss portion 32 is appropriately selected as long as it does not affect the function as a bearing with a resin pulley. It is good also as an axial width. In this case, it is advantageous for reducing the weight of the bearing with the resin pulley.

  Modification 1 of the bearing with the resin pulley according to the first embodiment is shown in FIGS. This modification differs from the first embodiment described above in that radial protrusions 20 are formed on the flange 17 of the outer ring 13 as shown in FIG. Other configurations are the same as those of the first embodiment, and the same reference numerals are used for the same configurations.

  In the first modification, protrusions 20 are formed on the flange 17 of the outer ring 13 at four equal intervals in the circumferential direction instead of the serrations 19 in the first embodiment. Each projection 20 has an axial outer surface exposed, and is embedded in the resin of the resin pulley 31 in this exposed state (see FIG. 4B).

  The protrusion 20 can be formed in advance on the steel sheet before press forming by press working or the like. For this reason, as in the case where the serrations 19 are formed, the protrusions 20 are formed on the outer ring 13 as compared with the case where peripheral grooves and the like are formed on the outer ring formed by forging as described in Patent Documents 2 to 4. Can be easily formed. As a result, the manufacturing cost can be reduced. The number of protrusions 20 installed on the flange 17 is appropriately set according to the radial load applied to the resin pulley 31, and may be, for example, one, two, three, or five or more.

  Further, since the protrusion 20 is embedded in the resin of the resin pulley 31, the resin pulley 31 is locked to the protrusion 20 of the outer ring 13. Thereby, like the case of the above-mentioned 1st Embodiment, the yield strength with respect to the creep of the resin pulley 31 can be improved.

  Modification 2 of the bearing with a resin pulley according to the first embodiment is shown in FIGS. This modification is different from the first embodiment described above in that a notch 21 is formed in the flange 17 of the outer ring 13 as shown in FIG. Other configurations are the same as those of the first embodiment, and the same reference numerals are used for the same configurations.

  In the second modification, notches 21 are formed at equal intervals in four circumferential directions on the flange 17 of the outer ring 13 instead of the serrations 19 in the first embodiment. Resin of the resin pulley 31 is embedded in each notch 21 (see FIG. 5B).

  This notch 21 can be formed in advance on the steel sheet before press forming by press working or the like. For this reason, as in the case where the serrations 19 are formed, the outer ring 13 is notched compared to the case where peripheral grooves and the like are formed in the outer ring formed by forging as described in Patent Documents 2 to 4. 21 can be formed easily. As a result, the manufacturing cost can be reduced. The number of notches 21 installed on the flange 17 is appropriately set according to the radial load applied to the resin pulley 31, and may be 1, 2, 3, or 5 or more, for example.

  Further, since the resin of the resin pulley 31 fills the notch 21, the resin pulley 31 engages with the notch 21. Thereby, like the case of the above-mentioned 1st Embodiment, the yield strength with respect to the creep of the resin pulley 31 can be improved.

  Modification 3 of the bearing with the resin pulley according to the first embodiment is shown in FIGS. This modification is different from the first embodiment described above in that an engagement hole 22 is formed in the flange 17 of the outer ring 13 as shown in FIG. Other configurations are the same as those of the first embodiment, and the same reference numerals are used for the same configurations.

  In the third modified example, the engagement holes 22 are formed at equal intervals in four circumferential directions on the flange 17 of the outer ring 13 instead of the serrations 19 in the first embodiment. Resin of the resin pulley 31 is embedded in each engagement hole 22 (see FIG. 6B).

  The engagement hole 22 can be formed in advance on the steel sheet before press forming by press working or the like. For this reason, as in the case where the serration 19 is formed, the outer ring 13 is engaged as compared with the case where a peripheral groove or the like is formed in the outer ring formed by forging as described in Patent Documents 2 to 4. The hole 22 can be easily formed. As a result, the manufacturing cost can be reduced. In addition, the number of installation of the engagement hole 22 with respect to the flange 17 is appropriately set according to the radial load applied to the resin pulley 31, and may be 1, 2, 3, or 5 or more, for example.

  Further, since the resin of the resin pulley 31 fills the engagement hole 22, the resin pulley 31 engages with the engagement hole 22 (see FIG. 6B). Thereby, like the case of the above-mentioned 1st Embodiment, the yield strength with respect to the creep of the resin pulley 31 can be improved.

A second embodiment of the present invention is shown in FIG.
The bearing with a resin pulley according to the second embodiment is different from the first embodiment in that the flange 17 is formed at both ends of the outer ring 13, and the other configuration is the same as that of the first embodiment. The same reference numerals are used for the same configuration, and the description thereof is omitted.

  The outer ring 13 of this embodiment is also formed into a cylindrical shape by press forming of a steel plate, and has radially outward flanges 17 at both ends, as in the first embodiment, processing centering on plastic processing. And can be easily manufactured. As a result, the manufacturing cost can be reduced (see FIG. 7).

  Further, the resin pulley 31 is integrated between the flanges 17 and 17 in a state where both end surfaces of the boss portion 32 coincide with the outer end surfaces of the flanges 17, respectively. For this reason, the outer end surfaces of both flanges 17 are exposed, and the heat dissipation of heat transmitted to the outer ring 13 is improved as compared with that of the first embodiment.

  Further, the boss portion 32 of the resin pulley 31 is in contact with the inner end surfaces of both flanges 17 in the radial direction, and the radial contact area is increased as compared with that of the first embodiment. The resistance against creep of the resin pulley 13 can be maintained by the increased frictional resistance in the radial contact region.

The longitudinal cross-sectional view which shows the bearing with a resin pulley which concerns on 1st Embodiment Side view showing the same bearing with resin pulley Partially cutaway perspective view showing the same bearing with resin pulley (A) Partially cutaway side view showing modified example 1 of the above-mentioned bearing with resin pulley, (b) Partially cutaway perspective view showing modified example 1 of the above bearing with resin pulley (A) Partially cutaway side view showing modified example 2 of the bearing with resin pulley, (b) Partially cutaway perspective view showing modified example 2 of the bearing with resin pulley, same as above (A) Partially cutaway side view showing modified example 3 of the bearing with resin pulley, (b) Partially cutaway longitudinal sectional view showing modified example 3 of the bearing with resin pulley, (c) Partially cutaway perspective view showing modified example 3 of bearing with resin pulley The longitudinal cross-sectional view which shows the bearing with a resin pulley which concerns on 3rd Embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Rolling bearing 12 Inner ring 13 Outer ring 14 Ball 15 Cage 16 Shield plate 17 Flange 18 Track 19 Serration 20 Protrusion 21 Notch 22 Engagement hole 31 Resin pulley 32 Boss part 33 Outer part

Claims (7)

  In a bearing with a resin pulley in which a resin pulley (31) is integrally formed by injection molding on the outer periphery of an outer ring (13) of a rolling bearing (11), the outer ring (13) is formed by press molding of a steel plate and has a diameter at one end. A flange (17) that is outward in the direction, and the inner peripheral portion (32) of the resin pulley (31) is integrated with the outer periphery of the outer ring so as to cover the outer diameter surface of the flange (17). A bearing with a resin pulley.   An inner peripheral portion (32) of the resin pulley (31) is formed to have the same axial width as the outer ring (13), and an end surface thereof is made to coincide with an axially outer surface of the flange (17), so that the flange (17) The bearing with a resin pulley according to claim 1, wherein the outer diameter surface is covered.   The bearing with a resin pulley according to claim 1 or 2, wherein a serration (19) is formed on an outer diameter surface of the flange (17).   The bearing with a resin pulley according to claim 1 or 2, wherein a radial protrusion (20) is formed on an outer diameter surface of the flange (17).   The bearing with a resin pulley according to claim 1 or 2, wherein a notch (21) is formed in an outer peripheral portion of the flange (17).   The bearing with a resin pulley according to claim 1 or 2, wherein an engagement hole (22) in which the resin of the resin pulley (31) is embedded is formed in the flange (17). The bearing with a resin pulley according to any one of claims 1 to 6, wherein the flange (17) is formed at both ends of the outer ring (13).

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