JP2009014119A - Bearing with resin pulley - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress a temperature rise of a rolling bearing while preventing an outer ring from deforming by contraction of an injection resin, in a bearing with a resin pulley wherein a resin pulley member is integrally formed by injection molding around the rolling bearing. <P>SOLUTION: A ring 7 consisting of a metal ring plate is fixed on a widthwise center of an outer diameter part of the outer ring 2. Heat conductivity of the ring 7 is higher than that of the injection resin. The ring 7 is held from both sides by a plurality of ribs 8 for connecting a boss part 4 of the resin pulley member 3 and an outer circumferential part 5. A heat dissipation window 9 for exposing the ring 7 to outside is formed between the ribs 8, 8. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bearing with a resin pulley in which a resin pulley member is integrally formed around a rolling bearing by injection molding.

  As a bearing with this type of resin pulley, the rolling bearing is held by the boss portion of the resin pulley member, thereby preventing relative displacement in the circumferential direction between the rolling bearing and the resin pulley member (hereinafter simply referred to as creep). There is something.

Also, in this type of bearing with resin pulley, since the circumference of the rolling bearing is largely surrounded by the resin pulley member, the outer ring is tightened by resin shrinkage due to injection molding, and as a result, the roundness of the outer ring decreases, and the raceway, There is a feature that the shape accuracy of the inner ring inner surface and the like is likely to be lowered.
For this reason, some conventional bearings with resin pulleys are equipped with a ring that is press-fitted into the outer diameter portion of the outer ring of the rolling bearing, and the rigidity of the ring is utilized by injection molding a resin pulley member around the ring. In some cases, the outer ring is prevented from being deformed, and an outer ring conforming to the international standard for rolling bearings can be used (for example, Patent Document 1).

Japanese Utility Model Publication No. 7-28259

  However, since a conventional bearing with a resin pulley is covered with a boss portion of a resin pulley member around an outer ring or a ring, heat dissipation is poor compared to a bearing with a metal pulley employing a metal pulley. Therefore, the conventional bearing with a resin pulley has a problem that the heat generated by the rolling bearing is likely to be stored in the resin pulley member through the outer ring, and the bearing temperature tends to be relatively high.

  Accordingly, an object of the present invention is to provide a resin pulley bearing in which a resin pulley member is integrally formed around a rolling bearing by injection molding, while preventing the outer ring of the rolling bearing from being deformed by contraction of the injection resin, It is to suppress high temperature.

  In order to achieve the above object, the present invention provides a resin pulley bearing integrally formed by injection molding with a resin pulley member around a rolling bearing, and a ring that contacts the outer diameter portion of the outer ring is fixed to the outer ring. The ring has a heat conductivity higher than that of the resin forming the resin pulley member, the resin pulley member is injection-molded around the ring, and a heat radiating window that exposes the ring to the resin pulley member is provided. It is characterized by the structure formed.

According to the configuration of the present invention, since the ring is in contact with the outer diameter portion of the outer ring, the heat of the outer ring is transmitted to the ring or the resin pulley member. The ring has a higher thermal conductivity than the resin forming the resin pulley member. For this reason, the heat of the outer ring is more easily transferred to the ring than the resin pulley member, and the heat radiation between the ring exposed portion of the heat radiation window and the outside air is more efficient than the heat radiation between the resin pulley member and the outside air. Accordingly, the heat dissipation efficiency from the outer ring to the outside is improved by the heat radiation between the ring exposed portion and the outside air, so that the high temperature of the rolling bearing can be suppressed.
Further, since the resin pulley member is injection-molded around the ring, the outer ring of the rolling bearing is prevented from being deformed by the contraction of the injection resin due to the rigidity of the ring.

  As the ring fixing means, press fitting, welding, or the like to the outer ring can be employed.

  If the structure in which the ring is press-fitted into the outer diameter portion of the outer ring is employed, the contact between the outer ring and the ring is ensured and heat conduction between the outer ring and the ring is easily obtained as compared with the case of welding.

When the ring is press-fitted into the outer diameter portion of the outer ring, the outer ring is tightened by the ring, and the outer ring may be deformed by the influence. If priority is given to preventing deformation of the outer ring, a configuration may be adopted in which the ring is a metal ring and is fixed to the outer ring by welding.
According to this configuration, the fit between the outer diameter portion of the ring and the outer ring is sufficient to obtain the contact necessary for welding, and is loosened as compared with the case where the metal ring is fixed to the outer ring only by press fitting. As a result, deformation of the outer ring can be made difficult.

  Here, if the ring is fixed by projection welding, a reliable nugget can be generated, so that the ring can be firmly fixed easily. In addition, projection welding has good current convergence and quick welding, so that deformation of the base metal is difficult to occur, and is suitable for preventing deformation of the outer ring.

  Further, if the ring and the outer ring are firmly fixed by welding, the resistance against creep between the resin pulley member and the outer ring can be obtained by frictional contact between the ring and the resin pulley member. That is, the creep prevention performance can be enhanced by increasing the contact area between the ring and the resin pulley member.

As a specific configuration of the present invention, the ring is interposed between the boss portion and the outer peripheral portion of the resin pulley member, and a plurality of ribs connecting the boss portion and the outer peripheral portion are arranged from the side of the ring. A structure in which the heat radiation window is formed between the plurality of ribs can be adopted.
According to this configuration, the exposed portion of the ring side surface can be brought into contact with the outside air through the heat radiation window between the ribs connecting the boss portion and the outer peripheral portion of the resin pulley member.
Since the ring reaches the outer peripheral portion of the resin pulley member, a reduction in the radial contact area between the resin pulley member and the rolling bearing can be avoided. Furthermore, since the ring fixed to the outer ring is supported by the rib between the boss portion and the outer peripheral portion of the resin pulley member, contact between them can also be obtained. Therefore, if this configuration is adopted, the occurrence of creep between the rolling bearing and the resin pulley member can be further prevented.

When adopting the configuration relating to the rib, it is possible to adopt a configuration in which the ring is formed of an annular metal plate that fits to the outer diameter portion of the outer ring.
An annular ring made of a metal plate is advantageous when weight reduction is given priority over its rigidity.
In addition, the ring which consists of an annular | circular shaped metal plate also has the advantage obtained easily by press work.

Further, when adopting the configuration related to the rib, the ring has an inner annular portion that fits to the outer diameter portion of the outer ring, and a flange portion that is smaller in width than the inner annular portion and extends in the outer diameter direction. Adopting a configuration in which a boss portion of the resin pulley member is formed around the inner annular portion, an outer peripheral portion of the resin pulley member is formed around the flange portion, and the flange portion is supported by the rib. Can do.
According to this configuration, the thermal conductivity between the outer ring and the ring and the rigidity of the ring can be increased by largely fitting the inner annular part of the ring and the outer diameter part of the outer ring. The fitting width is preferably as large as possible to increase the thermal conductivity between the outer ring and the ring and the rigidity of the ring.
Further, if the boss portion of the resin pulley member is formed around the inner annular portion and the outer peripheral portion of the resin pulley member is formed around the flange portion, the inner annular portion fixed to the outer diameter portion of the outer ring A narrower flange portion is interposed between the boss portion and the outer peripheral portion of the resin pulley member. For this reason, the weight of the ring is lighter than when the diameter of the inner annular portion is simply increased.

When adopting the configuration relating to the flange portion, it is possible to adopt a configuration in which the ring has a T-shaped cross section with the inner annular portion and the flange portion.
If the inner annular portion and the flange portion have a ring having a T-shaped cross section, the heat of the inner annular portion fitted to the outer diameter portion of the outer ring is transferred from both sides of the ring to the flange portion, The arrangement is close to the center of the width of the outer ring, which tends to be particularly hot due to frictional heat between the raceway and the rolling elements.
Therefore, if this configuration is adopted, the heat of the outer ring is efficiently transmitted to the flange portion, so that the heat dissipation can be improved.

Moreover, when employ | adopting the structure which concerns on the said flange part, the structure which made the said ring the metal press work product which makes a cross-sectional L shape by the said inner annular part and the said flange part is employable.
According to this structure, it becomes possible to form a ring by metal press processing by making it L-shaped in cross section, thereby avoiding welding of the inner annular portion and the flange portion and easily forming the ring. Can do.

  In addition, the said cross-sectional T shape and L shape mean the form when an axial plane is made into a cut surface.

  In the case of adopting the configuration related to the rib, it is possible to form the rib on both sides or one side of the ring in consideration of misalignment, inclination, creep prevention and the like of the ring.

  When priority is given to the above-described creep prevention, etc., if the structure in which the rib and the heat radiating window are formed on both sides of the ring is adopted, the rib support from both sides of the ring can be relatively firmly prevented from creeping. The sacrifice of the heat radiation performance can be suppressed by forming the heat radiation windows on both sides of the ring.

  When heat dissipation is prioritized over the above-described creep prevention or the like, if the structure in which the rib and the heat dissipation window are formed on one side of the ring and the other side of the ring is open to the outside is adopted, Since the other side is opened to the outside almost entirely, the heat dissipation can be relatively enhanced, and the rib support from one side of the ring can prevent creep.

  As described above, according to the present invention, in a bearing with a resin pulley in which a resin pulley member is integrally formed by injection molding around an outer ring of a rolling bearing, a ring that contacts the outer diameter portion of the outer ring is fixed to the outer ring. The ring has a heat conductivity higher than that of the injection resin for molding the resin pulley member, the resin pulley member is injection molded around the ring, and a heat radiating window for exposing the ring to the resin pulley member is provided. By adopting the formed configuration, it is possible to prevent the rolling bearing from being heated at a high temperature while preventing the outer ring of the rolling bearing from being deformed by the shrinkage of the injection resin.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1A shows a perspective view of a state in which the bearing with a resin pulley according to the first embodiment is partially cut out so as to expose the outer diameter portion of the outer ring 2 of the rolling bearing 1. FIG.1 (b) has shown the longitudinal cross-section of the bearing with a resin pulley which concerns on 1st Embodiment.

  The bearing with a resin pulley shown in FIG. 1 is obtained by integrally molding a resin pulley member 3 around an outer ring 2 of a rolling bearing 1 by injection molding.

  The resin pulley member 3 has a boss portion 4 that holds the outer ring 2 from the outside, and an outer peripheral portion 5 on which the belt is hung. The boss portion 4 of the resin pulley member 3 holds the outer ring 2 from the outside, so that the relative displacement between the resin pulley member 3 and the outer ring 2 is prevented. The outer peripheral portion 5 of the resin pulley member 3 has a pulley groove formed at the outer end thereof.

  Circumferential grooves 6, 6 are formed in the outer diameter portion of the outer ring 2, and injection resin for forming the boss portion 4 enters the peripheral grooves 6, 6. Thereby, the creep between the outer ring | wheel 2 and the resin pulley member 3 is prevented.

  This bearing with a resin pulley has a ring 7 that contacts the outer diameter portion of the outer ring 2. The ring 7 has a higher thermal conductivity than the injection resin. The material of the ring 7 is better as the thermal conductivity is higher, but the weight can be reduced as the specific gravity is lower.

  More specifically, the ring 7 is made of an annular metal plate that is fitted to the outer ring 2. Since this ring 7 is made of metal, it has a higher thermal conductivity than the injection resin. In particular, the ring 7 is made of a pressed product of a steel plate and can be easily formed.

The ring 7 is fixed so as to contact on the center of the width of the outer ring 2, and is located in the middle between the circumferential grooves 6 and 6.
In the first embodiment, since the boss portion 4 of the resin pulley member 3 is shaped so as to hold the outer diameter side of the side end portion of the outer ring 2 from both sides, the ring 7 is fixed to the outer diameter portion of the outer ring 2 before injection molding. ing.

  The ring 7 is fixed by press fitting with the outer diameter portion of the outer ring 2. The linear expansion coefficient of the outer ring 2 and the ring 7 is set so that the diameter expansion due to the temperature increase of the outer ring 2 is equal to the diameter expansion of the inner periphery due to the temperature increase of the ring 7 or the diameter expansion on the inner periphery side of the ring 7 is reduced. If set, loosening of the contact is prevented.

  A resin pulley member 3 is integrally formed by injection molding around the outer ring 2 and the ring 7 fixed to the outer diameter portion of the outer ring 2. The rigidity of the ring 7 prevents the outer ring 2 from being deformed by the shrinkage of the injection resin.

As a result of injection molding of the resin pulley member 3, the ring 7 is interposed between the boss portion 4 and the outer peripheral portion 5 of the resin pulley member 3.
The outer diameter portion of the ring 7 and the outer peripheral portion 5 of the resin pulley member 3 are in contact with each other in the radial direction. The outer diameter portion of the outer ring 2 is in contact with the boss portion 4 of the resin pulley member 3 in the radial direction at other portions excluding the fixing portion of the ring 7. Therefore, the radial contact area between the resin pulley member 3 and the rolling bearing 1 side (the outer ring 2 and the ring 7) is not reduced, and the provision of the ring 7 does not lower the creep prevention performance.
The ring 7 is provided so as not to protrude from the width and outer diameter of the resin pulley member 3, thereby avoiding interference with the outside.

The outer diameter portion of the ring 7 is supported from both sides by the outer peripheral portion 5 of the resin pulley member 3, and the inner diameter portion of the ring 7 is supported from both sides by the boss portion 4 of the resin pulley member 3.
Further, the resin pulley member 3 has a plurality of ribs 8, 8... Connecting the boss portion 4 and the outer peripheral portion 5 formed on both sides of the ring 7. Each rib 8 is in contact with the same side surface of the ring 7. Thereby, the radial direction intermediate part of the ring 7 is equally supported by the rib 8 over the perimeter from both sides.

  As described above, the ring 7 is made of an annular metal plate, but is supported from both sides by the resin pulley member 3 at the inner and outer diameter portions and the radial intermediate portion, so that its inclination and displacement to both sides with respect to the outer ring 2 are increased. Is prevented. As a result, the ring 7 is unfixed, and the ring 7 and the outer ring 2 and the resin pulley member 3 are in contact with each other.

  Note that the ring 7 is inclined at the boss portion 4 and the outer peripheral portion 5 of the resin pulley member 3, and displacement to both sides is prevented, so that it is not always necessary to form the ribs 8 on both sides. For example, when the lateral displacement of the ring 7 only needs to be restricted to one side, the rib 8 may be formed only on one side of the ring 7.

  By the support contact between the ring 7 fixed to the outer ring 2 and each rib 8, the occurrence of creep between the rolling bearing 1 and the resin pulley member 3 is further prevented. From the viewpoint of preventing creep, it is preferable to form ribs 8 on both sides of the ring 7.

  The ring 7 is made of metal and has higher rigidity than the resin forming the resin pulley member 3. The ring 7 having excellent rigidity as described above is fitted to the outer diameter portion of the outer ring 2 and reaches the outer peripheral portion 5 of the resin pulley member 3 and is supported from both sides by the plurality of ribs 8 and 8. 5 can receive a radial load from a belt (not shown) hung on the outer diameter portion. Therefore, it is possible to cope with an increase in belt tension using the ring 7.

  Between the plurality of ribs 8 of the resin pulley member 3, heat radiating windows 9, 9, 9... For exposing the ring 7 to the outside are formed. For this reason, the ring 7 can touch outside air in the part exposed from each heat radiating window 9 among the both sides | surfaces.

  Each heat radiating window 9 is formed at the time of injection molding of the resin pulley member 3, but can be opened by post-processing.

  The ring 7 is made of a material having a larger elastic modulus than the injection resin, and can receive the radial load of the resin pulley together with the resin pulley member 3. In this way, the strength of the bearing with the resin pulley can be easily obtained while forming each heat radiation window 9 between the boss portion 4 and the outer peripheral portion 5 of the resin pulley member 3.

  The ribs 8 and the heat radiating windows 9 are formed at equal intervals in the circumferential direction, and the outer ring 2, the ring 7, and the resin pulley member 3 are rotationally symmetric at the equal interval pitch. For this reason, the heat transferred from the outer ring 2 to the ring 7 to the resin pulley member 3 is radiated from the entire circumference of the ring 7 to the resin pulley member 3 in a well-balanced manner. Further, each heat radiating window 9 is formed on both sides of the ring 7, and heat radiating performance is enhanced by radiating heat using both side surfaces of the ring 7.

  Note that the ring 7 does not form a positive change in the overall plate thickness and surface roughness in order to simplify the press work, but is not limited to this. For example, by forming a concavo-convex shape on the surface of the ring 7, the heat radiation area on the side surface of the ring 7 is increased, or the surface roughness of the side surface or outer diameter portion of the ring 7 is increased, so It is possible to improve the anti-creep performance.

In the bearing with the resin pulley having the above-described configuration, the heat of the outer ring 2 is transmitted from both sides in a well-balanced manner to the ring 7 positioned on the center of the width. In addition, the center of the width of the outer ring 2 tends to be particularly high due to frictional heat between the raceway of the outer ring 2 and the rolling elements of the rolling bearing 1. Since the ring 7 comes into contact with such a portion, the heat of the outer ring 2 is efficiently transmitted to the ring 7.
As described above, the heat of the ring 7 is radiated in a well-balanced manner when the externally exposed portions of the heat radiating windows 9 on both side surfaces touch the outside air. The heat transmitted from the outer ring 2 to the resin pulley member 3 is also radiated from the resin pulley member 3 in a balanced manner.
Therefore, the bearing with a resin pulley according to the first embodiment can suppress the temperature increase of the rolling bearing 1 while achieving a uniform temperature distribution.

  The structure of the resin pulley member 3 and the ring 7 can be appropriately changed as long as the ring 7 can be fixed to the outer ring 2 and the heat of the outer ring 2 can be radiated to the outside through the ring 7. As an example, FIG. 2 shows a second embodiment of the present invention. In the following, differences from the first embodiment will be mainly described, and the same reference numerals will be used for the same conceivable configurations.

  As shown in FIG. 2, the bearing with the resin pulley according to the second embodiment increases the number of the ribs 13 connecting the boss portion 11 and the outer peripheral portion 12 of the resin pulley member 10 by thinning them. The number of heat radiation windows 14 is increased while maintaining the strength of the member 10. Further, the resin pulley member 10 is a flat pulley having no pulley groove at the outer end of the outer peripheral portion 12.

A third embodiment of the present invention is shown in FIG.
In the bearing with resin pulley according to the third embodiment, a resin pulley member 23 is injection-molded around a ring 22 press-fitted into an outer ring 21 of a rolling bearing 20.
The ring 22 has an inner annular portion 24 that fits into the outer diameter portion of the outer ring 21 and a flange portion 25 that is smaller than the inner annular portion 24 and extends in the outer diameter direction.

  More specifically, the inner annular portion 24 of the ring 22 is formed in a cylindrical shape, and its width corresponds to the width of the outer ring 21. The inner annular portion 24 is made of a steel pipe material and is press-fitted into the outer diameter portion of the outer ring 21. This press-fitting is performed so that the inner annular portion 24 and the outer ring 21 are aligned with the same width.

  The flange portion 25 of the ring 22 is made of an annular press-formed product and is made of a steel plate. The flange portion 25 is welded onto the width center of the inner annular portion 24. As a result, the ring 22 has a T-shaped cross section with the inner annular portion 24 and the flange portion 25, has higher rigidity than that of the first embodiment, and is excellent in terms of preventing deformation of the outer ring 21. .

After the ring 22 is press-fitted into the outer ring 21, a resin pulley member 23 is injection molded around the ring 22. As a result, the boss portion 26 of the resin pulley member 23 is formed around the inner annular portion 24, and the outer peripheral portion 27 of the resin pulley member 23 is formed around the flange portion 25. As a result, the flange portion 25 of the ring 22 is interposed between the boss portion 26 and the outer peripheral portion 27 of the resin pulley member 23.
A plurality of ribs 28 and 28 and a heat radiation window 29 for exposing the side surface of the flange portion 25 to the outside are formed on both sides of the flange portion 25 of the ring 22.

The heat of the outer ring 21 is transmitted from the contact area excluding the chamfered portion of the outer diameter portion to the inner annular portion 24 of the ring 22. Since the outer ring 21 and the ring 22 are fixed by press-fitting, heat conduction between them is reliable. Further, the heat of the inner annular portion 24 of the ring 22 is transmitted to the flange portion 25 from both sides in a balanced manner.
The flange portion 25 of the ring 22 is located on the center of the width of the outer ring 21 due to the width relationship between the inner annular portion 24 and the outer ring 21. For this reason, the heat of the outer ring 21 is efficiently transmitted to the flange portion 25 at the shortest distance.

  Further, since the ring 22 extends the flange portion 25 having a smaller width than the inner annular portion 24 and reaches the outer peripheral portion 27 of the resin pulley member 23, the ring weight is lighter than when the inner annular portion 24 is simply increased in diameter. Can be

  As described above, it is preferable that the width of the inner annular portion 24 of the ring 22 corresponds to the width of the outer ring 21 in that the contact area with the outer diameter portion of the outer ring 21 can be maximized and the rigidity of the ring 22 can be improved. . In addition, when giving priority to weight reduction of the ring 22, the width of the inner annular portion 24 can be made narrower than that of the outer ring 21.

  The flange portion 25 of the ring 22 is supported from the side by a plurality of ribs 28, 28... Of the resin pulley member 23, and creep and inclination are prevented. If the inclination of the flange portion 25 is prevented, the contact with the outer peripheral portion 27 of the resin pulley member 23 becomes difficult to loosen.

  In the bearing with a resin pulley according to the second embodiment, since the flange portion 25 of the ring 22 is supported from both sides, creep prevention and the like can be obtained more effectively than in the case of supporting from one side. . Although not particularly illustrated, the rib 28 and the heat radiation window 29 can be formed only on one side of the flange portion 25.

  The boss portion 26 of the resin pulley member 23 is hooked only on one width surface of the outer ring 21 and the inner annular portion 24 of the ring 22, but the positional deviation between the outer ring 21 and the ring 22 is not a problem. This is because the relative axial movement between the rolling bearing 20 and the ring 22 can be sufficiently prevented by press-fitting the inner ring portion 24 of the ring 22 and the outer ring 21.

  As described above, if the boss portion 26 of the resin pulley member 23 has a shape in which at least one of the width surfaces of the ring 22 does not protrude from the ring 22 toward the inner diameter side, the ring member 22 is first formed. After the resin pulley member 23 is injection-molded, it can be fitted to the outer ring 21 from one width surface side of the ring 22. Therefore, there is an advantage that the injection molding of the resin pulley member 23 is facilitated.

  For example, FIG. 4 shows a fourth embodiment of the present invention as a modification of the third embodiment. In the bearing with resin pulley according to the fourth embodiment, the boss portion 41 of the resin pulley member 40 does not have a portion that covers the outer ring of the rolling bearing 20 and both width surfaces of the ring 22. The bearing with a resin pulley according to the fourth embodiment has a pulley groove at the outer end of the outer peripheral portion 42 of the resin pulley member 40 and has a relatively small load from the belt, and is between the outer ring 21 and the ring 22. It is easy to prevent misalignment by only these press-fittings.

  As described above, the resin pulley-equipped bearing according to the fourth embodiment has a shape in which the boss 41 of the resin pulley member 40 does not hang on the outer ring of the rolling bearing 20 and the width surface of the ring 22. At this time, the injection resin can be made difficult to enter the seal groove portion of the outer ring of the rolling bearing 20.

  In addition, since the bearing with the resin pulley according to the fourth embodiment is for applications with a relatively small belt load, the boss portion 41 of the resin pulley member 40, the outer peripheral portion 42, and the rib 43 connecting them are thinned, Thereby, the number of the radiation windows 44 and the span in the radial direction are increased.

A fifth embodiment of the present invention is shown in FIG.
In a bearing with a resin pulley according to the fifth embodiment, a resin pulley member 53 is injection-molded around a ring 52 press-fitted into an outer ring 51 of a rolling bearing 50, and the ring 52 includes an inner annular portion 54 and a flange portion 55. However, the following configuration is different.

  The ring 52 according to the fifth embodiment is a metal press-worked product having an L-shaped cross section with an inner annular portion 54 and a flange portion 55. Therefore, the ring 52 is not welded between the inner annular portion 54 and the flange portion 55, and can be easily formed as compared with the third embodiment.

  Since the ring 52 has an L-shaped cross section, the boss portion 56 of the resin pulley member 53 is formed only on the L-shaped bent side. For this reason, the plurality of ribs 58 and 58 and the heat radiation window 59 that connect the boss portion 56 and the outer peripheral portion 57 of the resin pulley member 53 are also formed only on one side of the L-shaped bent side of the flange portion 55 of the ring 52. Yes. The other side of the flange portion 55 is open to the outside. For this reason, the bearing with a resin pulley which concerns on 5th Embodiment can improve the thermal radiation performance from the ring 52 compared with the said 1st-4th embodiment.

  Although not specifically illustrated, even when the ring 52 is employed, the outer peripheral portion 57 of the resin pulley member 53 is extended in the inner diameter direction to form a flange or a plurality of ribs and a heat radiation window, and the flange portion 55 is formed with a flange or the like. It is also possible to support the other side.

  In the first to fifth embodiments, the ring is press-fitted and fixed to the outer ring. However, the fixing means of the ring is appropriately selected as long as it does not affect the positional deviation during injection molding and the desired function as a bearing with a resin pulley. The following means can be adopted. For example, if the ring is welded to the outer ring, firm fixation can be obtained even with a metal plate. As an example, a sixth embodiment of the present invention will be described.

  The bearing with a resin pulley according to the sixth embodiment shown in FIG. 6 is obtained by fixing the ring 7 ′ to the outer diameter portion of the outer ring 2 ′ by projection welding in the bearing with a resin pulley according to the second embodiment.

As shown in FIGS. 7A to 7C, a ring 7 ′ having a projection p formed on the entire inner circumference is used. Projection welding is performed by bringing the projection p into contact with a position located on the center of the width of the outer ring 2 '.
The outer ring 2 ′ does not have the above-described creep preventing groove in the outer diameter portion. This is to prevent the projection p from being caught when the ring 7 ′ is fitted.

  By using the projection p as a ring projection, the generated nugget n extends over the entire outer diameter portion on the width center of the outer ring 2 ′. For this reason, the heat of the outer ring 2 'is transferred to the ring 7' in a well-balanced manner. The ring 7 'is firmly fixed to the outer diameter portion of the outer ring 2' over the entire circumference.

In the bearing with the resin pulley according to the sixth embodiment, the projection p of the ring 7 ′ and the outer ring 2 ′ are fitted by adding a ring 7 ′ fitted in the outer diameter portion of the outer ring 2 ′ in the radial direction by a projection welding machine. The tightening margin for pressing is set, but the projection p is crushed by projection welding, so the tightening margin is also eliminated.
Therefore, the bearing with the resin pulley according to the sixth embodiment does not deform the outer ring due to the effect of fitting the ring 7 'as compared with the case where the ring 7' is fixed to the outer diameter portion of the outer ring 2 'only by press fitting. Can be reduced.

The welding position between the ring and the outer ring can be provided on the side surface of the outer ring. However, it is preferable to provide the welding position on the outer diameter portion of the outer ring in that the width of the bearing with the resin pulley can be reduced.
Although it is possible to form a projection on the outer ring, it is better to form a projection on the ring side because the outer ring is out of the standard product.

A bearing with a resin pulley according to a seventh embodiment of the present invention will be described with reference to FIGS.
The bearing with resin pulley according to the seventh embodiment shown in FIG. 8 is obtained by fixing the ring 22 ′ to the outer diameter portion of the outer ring 21 by projection welding in the bearing with resin pulley according to the third embodiment.

  As shown in FIG. 9, as the ring 22 ′, a ring in which projections p and p are formed on the inner circumference of the inner annular portion 24 ′ at equal distances on both sides from the center of the width is used. . The inner annular portion 24 'and the flange portion 25' are projection welded.

  By projection welding of the ring 22 ′, nuggets n and n are generated over the entire circumference of the outer diameter portion at equal distances from the width center of the outer ring 21 to both sides. This avoids a welded portion between the inner annular portion 24 ′ and the flange portion 25 ′ located on the center of the width of the outer ring 21, and stable pressurization between the inner annular portion 24 ′ and the outer diameter portion of the outer ring 21. , Energization is possible.

  In addition, the outer diameter part of the outer ring | wheel 21 consists of a cylindrical surface, and the groove | channel for knot prevention and knurling are not given. This is to prevent the groove edge or knurled edge from becoming an unintended projection.

  The flange portion 25 ′ of the ring 22 ′ is supported from the side by a plurality of ribs 28, 28... Of the resin pulley member 23, and prevents creep, inclination of the flange portion 25 ′, and welding disconnection at each location. Has been.

A bearing with a resin pulley according to an eighth embodiment of the present invention will be described with reference to FIGS.
The bearing with resin pulley according to the eighth embodiment shown in FIG. 10 is obtained by fixing the ring 52 ′ to the outer diameter portion of the outer ring 51 by projection welding in the bearing with resin pulley according to the fifth embodiment.

  As shown in FIG. 11, the ring 52 'has a projection p formed on the center of the inner circumferential width of the inner annular portion 54'. By projection welding of the ring 52 ′, a nugget n is generated over the entire outer diameter portion on the width center of the outer ring 51. In the ring 52 ′, since the flange portion 55 and the inner annular portion 54 ′ are integrally formed, unlike the seventh embodiment, the projection p can be set on the width center of the outer ring 51.

a is an overall perspective view in which a part of the bearing with a resin pulley according to the first embodiment is cut away, and b is a longitudinal sectional view of the bearing with a resin pulley of a. a is an overall perspective view in which a part of the bearing with a resin pulley according to the second embodiment is cut away, and b is a longitudinal sectional view of the bearing with a resin pulley of a. a is the whole perspective view which notched some resin pulleys concerning 3rd Embodiment, b is the longitudinal cross-sectional view of the resin pulley of a a is an overall perspective view in which a part of a resin pulley according to the fourth embodiment is cut away, and b is a longitudinal sectional view of the resin pulley of a. a is an overall perspective view in which a part of a resin pulley according to the fifth embodiment is cut away, and b is a longitudinal sectional view of the resin pulley of a. a is a longitudinal sectional view of a bearing with a resin pulley according to the sixth embodiment, and b is an overall perspective view in which a part of the bearing with a resin pulley of a is cut away. a is a component diagram showing a longitudinal section of the metal ring in FIG. 6, b is an action diagram conceptually showing projection welding between the ring and the outer ring in FIG. 6, and c is a conceptual nugget between the ring and the outer ring in FIG. Action diagram shown in a is a longitudinal sectional view of a bearing with a resin pulley according to the seventh embodiment, and b is an overall perspective view in which a part of the bearing with a resin pulley is cut out. a is a component diagram showing a longitudinal section of the metal ring of FIG. 8, and b is an operation diagram conceptually showing a nugget between the metal ring and the outer ring of FIG. a is a longitudinal sectional view of a bearing with a resin pulley according to the eighth embodiment, and b is an overall perspective view in which a part of the bearing with a resin pulley of a is cut out. a is a component diagram showing a longitudinal section of the metal ring of FIG. 10, and b is an operation diagram conceptually showing a nugget between the metal ring and the outer ring of FIG.

Explanation of symbols

1, 20, 50 Rolling bearing 2, 2'21, 51 Outer ring 3, 10, 23, 40, 53 Resin pulley member 4, 11, 26, 41, 56 Boss part 5, 12, 27, 42, 57 Outer peripheral part 6 Circumferential grooves 7, 7 ', 22, 22', 52, 52 'Rings 8, 13, 28, 43, 58 Ribs 9, 14, 29, 44, 59 Radiating window 24, 24', 54, 54 'Inner annular portion 25, 25 ', 55 Flange p Projection n Nugget

Claims (11)

In a bearing with a resin pulley in which a resin pulley member is integrally formed by injection molding around a rolling bearing,
A ring that contacts the outer diameter portion of the outer ring is fixed to the outer ring, the ring has higher thermal conductivity than the resin that forms the resin pulley member, and the resin pulley member is injection molded around the ring. The resin pulley member is provided with a heat radiating window for exposing the ring to the outside.   The bearing with a resin pulley according to claim 1, wherein the ring is press-fitted into an outer diameter portion of the outer ring.   The bearing with a resin pulley according to claim 1, wherein the ring is a metal ring and is fixed to the outer ring by welding.   The bearing with a resin pulley according to claim 3, wherein the ring is fixed by projection welding.   The ring is interposed between a boss portion and an outer peripheral portion of the resin pulley member, and a plurality of ribs connecting the boss portion and the outer peripheral portion are formed so as to support the ring from the side, The bearing with a resin pulley according to claim 1, wherein the heat radiation window is formed between the ribs.   The bearing with a resin pulley according to claim 5, wherein the ring is made of an annular metal plate fitted to an outer diameter portion of the outer ring.   The ring includes an inner annular portion that fits to the outer diameter portion of the outer ring, and a flange portion that is smaller in width than the inner annular portion and extends in the outer diameter direction, and the resin pulley member around the inner annular portion. The bearing with a resin pulley according to claim 5, wherein an outer peripheral portion of the resin pulley member is formed around the flange portion, and the flange portion is supported by the rib.   The bearing with a resin pulley according to claim 7, wherein the ring has a T-shaped cross section with the inner annular portion and the flange portion.   The bearing with a resin pulley according to claim 7, wherein the ring is a metal press-worked product having an L-shaped cross section with the inner annular portion and the flange portion.   The bearing with a resin pulley according to any one of claims 5 to 9, wherein the rib and the heat radiation window are formed on both sides of the ring.   The bearing with a resin pulley according to any one of claims 5 to 9, wherein the rib and the heat radiation window are formed on one side of the ring, and the other side of the ring is opened to the outside.

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