JP2009079697A - Bearing with resin pulley - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress reduction of a radial internal gap of a bearing due to thermal contraction. <P>SOLUTION: A resin pulley member 3 is integrated on an outer circumference part of an outer ring 2 of the rolling bearing 1, a recessed part 7 is provided on a whole circumference of a boundary part 6 of the outer ring 2 with the resin pulley member 3, and the recessed part 7 is provided in a position of the boundary part 6 corresponding to a radial outer side of a raceway 8 of the outer ring 2. Due to the recessed part 7, a portion of an outer circumference part of the outer ring 2 corresponding to the radial outer side of the raceway 8 and a boss part 4 of the resin pulley member 3 do not contact. Thereby, when clamping force of the resin pulley member 3 due to thermal contraction of the resin pulley member 3 is applied, the clamping force is not directly applied to a portion of the outer circumference part of the outer ring 2 corresponding to the radial outer side of the raceway 8. As a result, displacement of the raceway 8 of the outer ring 2 in an inner diameter side is suppressed, and influence affected on the radial internal gap of the rolling bearing 1 can be suppressed. <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 integrated with an outer peripheral portion of an outer ring of a rolling bearing.

  As a bearing with this type of resin pulley, both ends of the outer peripheral portion of the rolling bearing are held by the boss portion of the resin pulley member to prevent relative movement in the circumferential direction between the outer ring of the rolling bearing and the resin pulley member. There is something.

  In addition, this type of bearing with a resin pulley has a resin pulley member that is surrounded by a resin pulley member when the resin pulley member is integrated around the outer ring of the rolling bearing by injection molding. As a result, the outer ring is tightened, and as a result, the roundness of the outer ring is lowered, and the shape accuracy of the raceway, the inner ring inner surface and the like is liable to be lowered.

  For this reason, some conventional bearings with resin pulleys are equipped with a metal ring that is press-fitted into the outer periphery of the outer ring of the rolling bearing, and the resin pulley member is injection-molded around the ring to increase the rigidity of the ring. There are some which utilize the outer ring to prevent deformation (for example, Patent Document 1).

Japanese Patent Laid-Open No. 7-28259

  However, when the bearing with a resin pulley in which the resin pulley member is integrated with the outer peripheral portion of the outer ring is used in a high temperature environment, the resin pulley member is thermally contracted due to a thermal history. For this reason, the outer ring of the rolling bearing is in a tightened state, and there is a problem that the radial internal clearance of the rolling bearing is smaller than the initial (during manufacturing).

  In addition, when a bearing with a resin pulley in which a resin pulley member is integrated on the outer peripheral portion of the outer ring through a metal ring is used in a high temperature environment, the resin pulley member is thermally contracted due to thermal history. For this reason, the outer ring of the rolling bearing is in a state of being tightened via the ring, and there has been a problem that the radial internal clearance of the rolling bearing becomes smaller than the initial (manufacturing).

  When the radial internal clearance of the rolling bearing is reduced, the friction between the inner and outer ring raceways and the rolling elements increases, the bearing temperature rises and the lubricant changes in quality, and the raceways and rolling elements wear out. The life of the is shortened.

  Accordingly, an object of the present invention is to suppress a reduction in the radial internal clearance of the bearing due to heat shrinkage.

  In order to solve the above-described problems, the present invention provides a bearing with a resin pulley in which a resin pulley member is integrated with an outer peripheral portion of an outer ring of a rolling bearing, and a recess is formed on the entire periphery of a boundary portion between the resin pulley member and the outer ring. And the concave portion is configured to be provided at a position corresponding to the outer side in the radial direction of the race of the outer ring.

  According to the configuration of the present invention, the portion of the outer peripheral portion of the outer ring corresponding to the outer side in the radial direction of the track does not come into contact with the portion of the resin pulley member provided with the recess. For this reason, when the fastening force of the resin pulley member due to the thermal contraction of the resin pulley member is applied, the fastening force does not directly act on the portion of the outer peripheral portion of the outer ring corresponding to the outer side in the radial direction of the track. As a result, the displacement of the outer ring raceway in the inner diameter direction is suppressed, and the influence on the radial internal clearance of the rolling bearing can be suppressed.

  In the above configuration, the resin pulley member is integrated with the outer peripheral portion of the outer ring via a metal ring fitted to the outer peripheral portion of the outer ring, the boundary portion is the ring, and the outer periphery of the ring It is possible to adopt a configuration in which the concave portion is provided on the entire circumference in at least one of the portion or the inner circumferential portion.

  According to this configuration, the portion corresponding to the outer side in the radial direction of the track on the outer peripheral portion of the outer ring does not contact the portion provided with the concave portion of the ring. Or the part corresponding to the radial direction outer side of a track | orbit of the inner peripheral part of a resin pulley member and the part which provided the recessed part of the outer peripheral part of an outer ring | wheel do not contact. For this reason, when the tightening force of the resin pulley member due to the thermal contraction of the resin pulley member acts, the tightening force directly acts on the portion corresponding to the outer side in the radial direction of the outer ring surface of the outer ring through the ring. do not do. As a result, the displacement of the outer ring raceway in the inner diameter direction is suppressed, and the influence on the radial internal clearance of the rolling bearing can be suppressed.

  In order to effectively suppress displacement of the outer ring raceway by tightening the outer ring due to thermal contraction of the resin pulley member, the axial width of the recess is set to the axial width of the outer ring raceway. A configuration with the same width can be employed.

  When the ring has a sleeve fitted to the outer peripheral portion of the outer ring and a flange provided on the outer peripheral portion of the sleeve, and the concave portion is provided on the inner peripheral portion of the sleeve, Since the pulley member is supported, it is possible to receive a radial load from the belt hung on the outer peripheral portion of the resin pulley, and it is possible to cope with an increase in belt tension.

  When adopting the configuration relating to the flange, it is possible to adopt a configuration in which the flange is provided at a central portion in the axial direction of the sleeve. According to this configuration, since the rigidity of the sleeve is increased by the flange, the sleeve is not easily deformed in the radial direction against the tightening force of the resin pulley member due to the thermal contraction of the resin pulley member, and the displacement of the outer ring raceway in the inner diameter direction is reduced. It can be further reduced.

  When adopting the configuration relating to the flange, it is possible to adopt a configuration in which the flange is a metal working press product provided at one end of the sleeve. If it does in this way, it will become possible to form a ring by metal press work, and it can form a ring easily, avoiding welding with a sleeve and a flange.

  Further, it is possible to adopt a configuration in which a part of the ring is exposed to the outside from the resin pulley member and a heat radiating portion is formed. If it does in this way, since a part of ring exposed from a resin pulley member and external air will contact through this thermal radiation part, the heat | fever of the outer ring transmitted to the ring will be thermally radiated efficiently, and heat dissipation can be improved.

  As described above, the present invention is provided with the concave portion facing the outer ring raceway on the entire circumference of the boundary between the resin pulley member and the outer ring, so even if the outer ring is tightened by the thermal contraction of the resin pulley member, the concave portion Therefore, the tightening force does not directly reach the outer ring raceway. For this reason, the displacement to the internal diameter direction of a track | orbit is suppressed and the reduction | decrease of the radial internal clearance of a rolling bearing can be suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment. In this bearing with a resin pulley, a resin pulley member 3 is integrated with the outer periphery of the outer ring 2 of the rolling bearing 1.

  The rolling bearing 1 is a known rolling bearing, and for example, a deep groove ball bearing, an angular ball bearing, a cylindrical roller bearing, a tapered roller bearing, or the like can be applied. A resin pulley member 3 is integrated with the outer peripheral portion of the outer ring 2 of the rolling bearing 1 by press-fitting.

  The resin pulley member 3 is formed by integrally forming a boss portion 4 having the same width as the axial width of the outer ring 2 and an outer peripheral portion 5 on which the belt is hung. The outer peripheral portion of the outer ring 2 is integrated by press-fitting.

  Further, a recess 7 is provided over the entire circumference at the boundary 6 between the outer peripheral portion of the outer ring 2 and the boss portion 4 of the resin pulley member 3, that is, the inner peripheral portion of the boss portion 4. The recess 7 is provided at a position corresponding to the outer side in the radial direction of the track 8 of the outer ring 2 in the boundary portion 6 (inner peripheral portion of the resin pulley member 3). That is, the concave portion 7 is provided in the axial direction centering on a position where the plane P passing through the center in the axial direction of the track 8 shown in FIG. 1 intersects the inner peripheral portion of the boss portion 4 of the resin pulley member 3.

  By providing the concave portion 7 in the boundary portion 6, the portion corresponding to the outer side in the radial direction of the track 8 on the outer peripheral portion of the outer ring 2 and the portion provided with the concave portion 7 of the boss portion 4 of the resin pulley member 3 are defined. Do not touch. For this reason, when the tightening force of the resin pulley member 3 due to the thermal contraction of the resin pulley member 3 acts, the tightening force does not directly act on the outer peripheral portion of the outer ring 2 corresponding to the radially outer side of the track 8. As a result, the displacement of the outer ring 2 in the inner diameter direction of the raceway 8 is suppressed, and the influence on the radial internal clearance of the rolling bearing 1 can be suppressed.

  The axial width d of the recess 7 is set to the same width d as the axial width of the track 8, and the depth of the recess 7 is larger than the radial displacement due to the thermal contraction of the resin pulley member 3. It is set as appropriate as long as the strength of the pulley member 3 is not affected. If the width d in the axial direction of the recess 7 is the same as the width of the track 8, the tightening force of the resin pulley member 3 does not directly act on the outer peripheral portion of the outer ring 2 corresponding to the radially outer side of the track 8, The displacement in the inner diameter direction can be effectively suppressed over the entire range of the track 8 in the axial direction.

  The axial width of the recess 7 is set to the same width d as the axial width of the track 8, but the displacement of the track 8 in the inner diameter direction is suppressed, and the outer peripheral portion of the outer ring 2 and the resin pulley member 3 are creeped. As long as it is possible to prevent (relative slipping between the outer ring and the resin pulley member), it can be provided in an appropriate width.

  It is possible to provide the concave portion 7 on the outer peripheral portion of the outer ring 2 as the boundary portion 6 between the outer ring 2 and the resin pulley member 3. However, since the outer ring 2 is out of the standard product, the concave portion is formed on the resin pulley member 3 side. It is better to provide 7.

  A second embodiment according to the present invention is shown in FIG. In the second embodiment, as shown in the figure, the resin pulley member 13 is injection-molded into the outer peripheral portion of the outer ring 2 via a metal ring 12 press-fitted into the outer peripheral portion of the outer ring 2 of the rolling bearing 1. It differs from the case of the first embodiment in that it is integrated and the concave portion 17 is provided on the inner peripheral portion of the ring 12, and other configurations are the same as those in the case of the first embodiment.

  That is, since the resin pulley member 13 is integrated with the outer peripheral portion of the outer ring 2 via the ring 12, the ring 12 is the boundary portion 11 between the outer ring 2 and the resin pulley member 13, and the inner peripheral portion of the ring 12. A recess 17 is provided on the entire circumference of the ring 12, and a locking groove 18 is provided on the entire circumference of the outer periphery of the ring 12.

  The ring 12 fitted to the outer peripheral part of the outer ring 2 is fitted to the outer peripheral part of the outer ring 2 between the annular parts 12a fitted to both ends of the outer peripheral part of the outer ring 2, and is thinner than the annular part 12a. The cylindrical portion 12b is integrally connected, and is formed by cutting a metal pipe material. The ring 12 is fitted to the outer peripheral portion of the outer ring 2 so that the axially outer side surface portion of the annular portion 12 a is continuous with the outer diameter side of the end surface of the outer ring 2.

  The resin pulley member 13 includes an outer peripheral portion 15 on which a belt (not shown) is hung and a boss portion 14 integrated with the outer peripheral portion of the ring 12. The boss portion 14 of the resin pulley member 13 is integrated with the outer peripheral portion of the outer ring 2 so that the end surface of the outer ring 2 and the entire axially outer surface portion (heat radiating surface portion 19) of the annular portion 12a of the ring 12 are exposed to the outside. It becomes. Since the heat radiating surface portion 19 of the annular portion 12a is exposed to the outside, the heat of the outer ring 2 can be radiated from the heat radiating surface portion 19 to the outside through the circular portion 12a of the ring 12.

  Further, the boss portion 14 of the resin pulley member 13 is formed in both the annular portions 12a in a state of being embedded in the locking groove 18 having both the annular portions 12a as both groove walls and the cylindrical portion 12b as the groove bottom wall. By being engaged, positional deviation in both axial directions is prevented.

  The concave portion 17 of the ring 12 is provided at a position corresponding to the radially outer side of the raceway 8 of the outer ring 2 on the inner peripheral portion of the cylindrical portion 12b. That is, the concave portion 17 is provided around the position where the plane P passing through the center in the axial direction of the track 8 shown in FIG. 2 intersects the inner peripheral portion of the cylindrical portion 12b.

  By providing the concave portion 17 in the ring 12, the portion corresponding to the outer side in the radial direction of the track 8 on the outer peripheral portion of the outer ring 2 does not contact the portion provided with the concave portion 17 of the cylindrical portion 12 b of the ring 12. . For this reason, when the fastening force of the resin pulley member 13 due to the thermal contraction of the resin pulley member 13 is applied, the fastening force is absorbed by the cylindrical portion 12b of the ring 12 being elastically deformed in the inner diameter direction, and the cylindrical portion 12b. Therefore, it does not act directly on the portion corresponding to the outside of the track 8 in the radial direction. As a result, the displacement of the outer ring 2 in the inner diameter direction of the raceway 8 is suppressed, and the influence on the radial internal clearance of the rolling bearing 1 can be suppressed.

  Here, in the inner peripheral portion of the ring 12 (cylindrical portion 12b) at a position where the concave portion 17 is not provided, the outer ring 2 is tightened by the resin pulley member 13, and the tightening force causes the raceway 8 of the outer ring 2 to have an inner diameter. However, the rigidity of the outer peripheral portion of the outer ring 2 with respect to the inner diameter direction at the portion where the cylindrical portion 12 b comes into contact is significantly larger than that of the resin pulley member 13. For this reason, the influence of the displacement in the inner diameter direction of the track 8 due to the tightening of the resin pulley member 13 is small.

  The cylindrical portion 12b may not be provided with the concave portion 17, and the locking groove 18 provided on the outer peripheral portion of the ring 12 may be the concave portion 17. However, both the annular portions 12a and the boss portions of the resin pulley member 13 may be used. Therefore, it is better to provide the recess 17 in the inner peripheral portion of the cylindrical portion 12b (the inner peripheral portion of the ring 12).

A third embodiment of the present invention is shown in FIG.
In this bearing with a resin pulley, a resin pulley member 23 is integrated by injection molding on the outer diameter side of a ring 22 that is press-fitted into the outer ring 2 of the rolling bearing 1, and the ring 22 has both ends of the outer peripheral portion of the outer ring 2. Between the above-described second embodiment, the annular portion 22a fitted to the outer ring 2 is integrally connected to the outer peripheral portion of the outer ring 2 by a cylindrical portion thinner than the annular portion 22a. Although common, the following configurations are different.

  The ring 22 according to the third embodiment is formed by pressing a metal plate material, the annular portions 22a at both ends are formed by flange bending, and the central portion of the cylindrical portion 22b is curved in the outer diameter direction to form a recess. 27 is formed. For this reason, the ring 22 can be easily formed as compared with the second embodiment. Other operations and effects are the same as those of the second embodiment.

A fourth embodiment of the present invention is shown in FIGS.
In the bearing with resin pulley according to the fourth embodiment, a resin pulley member 33 is injection-molded around a ring 31 press-fitted into the outer peripheral portion of the outer ring 2 of the rolling bearing 1. The ring 31 includes a sleeve 34 fitted to the outer peripheral portion of the outer ring 2, and a flange 35 provided at the axially central portion of the outer peripheral portion of the sleeve 34.

  The ring 31 is a boundary portion 30 between the boss portion 36 of the resin pulley member 33 and the outer peripheral portion of the outer ring 2, and the sleeve 34 is formed in a cylindrical shape, and its width corresponds to the width of the outer ring 2. Yes. The sleeve 34 is made of a steel pipe material and is press-fitted to the outer peripheral portion of the outer ring 2. This press fitting is performed so that the sleeve 34 and the outer ring 2 are aligned in the same width in the axial direction.

  The flange 35 of the ring 31 is formed of an annular press-worked product, and is made of steel. The flange 35 is welded to the central portion of the sleeve 34 in the axial direction. As a result, the ring 31 is more rigid than those of the second and third embodiments.

  After the ring 31 is press-fitted into the outer ring 2, the resin pulley member 33 is injection molded around the ring 31. As a result, the boss portion 36 of the resin pulley member 33 is formed around the sleeve 34, the outer peripheral portion 37 of the resin pulley member 33 is formed around the flange 35, and the flange 35 of the ring 31 is connected to the boss of the resin pulley member 33. 36 and an outer peripheral portion 37. Thereby, since the load which concerns on the outer peripheral part 37 of the resin pulley member 33 is received by the flange 35, it can respond to the high tension | tensile_strength of a belt.

  Further, as shown in FIG. 5, the boss portion 36 of the resin pulley member 33 is hung only on one end face of the outer ring 2 and the sleeve 34 of the ring 31, but the positional deviation between the outer ring 2 and the ring 31 is a problem. Don't be. This is because the relative axial displacement between the rolling bearing 1 and the ring 31 can be sufficiently prevented by press-fitting the sleeve 34 of the ring 31 and the outer ring 2.

  A plurality of ribs 38 and 38 and a heat radiation window 39 (heat radiation portion) for exposing the side surface of the flange 35 to the outside are formed on both sides of the flange 35 of the ring 31. The heat of the outer ring 2 is transmitted to the sleeve 34 of the ring 31 from the contact area excluding the chamfered portion of the outer peripheral portion. Since the outer ring 2 and the ring 31 are fixed by press-fitting, heat conduction between them is reliable. Further, the heat of the sleeve 34 of the ring 31 is transmitted to the flange 35 from both sides in a balanced manner and is radiated from the heat radiation window 39.

  A recess 32 is provided on the entire inner periphery of the sleeve 34 of the ring 31. As shown in FIG. 4, the concave portion 32 is provided at a position corresponding to the outer side in the radial direction of the track 8 of the outer ring 2 on the inner peripheral portion of the sleeve 34 of the ring 31. That is, the concave portion 32 is provided in the axial direction centering on a position where a plane P passing through the center in the axial direction of the track 8 shown in FIG. 1 intersects the inner peripheral portion of the sleeve 34.

  Since the sleeve 34 is provided with the recess 32, the outer ring 2 has a portion corresponding to the outer side in the radial direction of the track 8 and a portion of the sleeve 32 of the ring 32 where the recess 32 is provided (inside the recess 32). No contact with the peripheral surface. For this reason, when the tightening force of the resin pulley member 33 due to thermal contraction of the resin pulley member 33 acts on the sleeve 34 of the ring 31, the tightening force causes the outer diameter portion of the concave portion 32 of the flange 34 to elastically deform in the inner diameter direction. As a result, it is absorbed and does not act directly on the outer circumferential portion of the outer ring 2 corresponding to the radially outer side of the track 8. As a result, the displacement of the outer ring 2 in the inner diameter direction of the raceway 8 is suppressed, and the influence on the radial internal clearance of the rolling bearing 1 can be suppressed.

  Further, since the flange 35 is welded to the sleeve 34 of the ring 31, the rigidity of the sleeve 34 is increased, and the sleeve 34 is deformed in the radial direction against the tightening force of the resin pulley member 33 due to the thermal contraction of the resin pulley member 33. It becomes difficult. As a result, the displacement of the outer ring 2 in the inner diameter direction of the track 8 can be further reduced.

  Here, as in the third embodiment, the outer ring 2 is tightened by the resin pulley member 33 at the inner peripheral portion of the ring 31 (sleeve 34) at a position where the recess 32 is not provided, and the tightening force is It acts to displace the raceway 8 of the outer ring 2 in the inner diameter direction, but the rigidity in the inner diameter direction at the portion of the outer peripheral portion of the outer ring 2 that contacts the sleeve 34 is significantly greater than that of the resin pulley member 33. For this reason, the influence of the displacement in the inner diameter direction of the track 8 due to the tightening of the resin pulley member 33 is small.

A fifth embodiment of the present invention is shown in FIGS.
In the bearing with resin pulley according to the fifth embodiment, a resin pulley member 43 is injection-molded around a ring 41 press-fitted to the outer ring 2 of the rolling bearing 1, and the ring 41 has a sleeve 44 and a flange 45. However, the following configuration is different.

  In the ring 41 according to the fifth embodiment, a flange 45 is provided at one end of a sleeve 44, and the sleeve 44 and the flange are metal press-processed products having an L-shaped cross section. For this reason, the ring 41 is not welded to the sleeve 44 and the flange 45, and can be easily formed as compared with the fourth embodiment.

  As shown in FIG. 6, since the ring 41 has an L-shaped cross section, the boss portion 46 of the resin pulley member 43 is formed only on the L-shaped bent side. Therefore, the plurality of ribs 48 and 48 and the heat radiation window 49 that connect the boss portion 46 and the outer peripheral portion 47 of the resin pulley member 43 are also formed only on one side of the L-shaped bent side of the flange 45 of the ring 41. . The other side of the flange 45 is open to the outside. For this reason, the resin pulley-equipped bearing according to the fifth embodiment can enhance the heat dissipation performance from the ring 41 as compared with the fourth embodiment.

  In the second to fifth embodiments, the ring is press-fitted and fixed to the outer ring, but 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 resin pulley according to the sixth embodiment shown in FIG. 8 is obtained by fixing the ring 12 to the outer diameter portion of the outer ring 2 by projection welding in the bearing with resin pulley according to the second embodiment.

  As shown in FIGS. 9A and 9B, a ring 12 in which a projection p is formed over 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.

  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 (see FIG. 8). For this reason, the ring 12 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 fitting between the projection p of the ring 12 and the outer ring 2 is a tightening allowance for pressurizing the ring 12 fitted to the outer peripheral portion of the outer ring 2 in the radial direction with a projection welding machine. However, since the projection p is crushed by projection welding, the tightening allowance is also eliminated.

  Therefore, in the bearing with a resin pulley according to the sixth embodiment, since the annular portion 12a of the ring 12 is firmly fixed to the outer peripheral portion of the outer ring 2, the rigidity of the annular portion 12 is increased, and the cylindrical portion 12b of the ring 12 is increased. Becomes difficult to deform in the radial direction, and the displacement of the outer ring 2 in the inner diameter direction of the track 8 can be further reduced. Further, the deformation of the outer ring due to the effect of fitting the ring 12 can be reduced as compared with the case where the ring 12 is fixed to the outer diameter portion of the outer ring 2 only by press fitting.

  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. 10 is the same as the bearing with resin pulley according to the second embodiment, in which the ring 22 is fixed to the outer peripheral portion of the outer ring 2 by press-fitting joining, which is a kind of solid phase joining. Is.

  Here, the press-fit joining is solid-phase joining by providing a press-fitting allowance between the plate-shaped ring and the outer peripheral portion of the shaft body, and energizing between the ring and the shaft body and press-fitting with electric resistance heat. (See Japanese Patent No. 3270758, paragraphs 0027 to 0031).

  The joining of the ring and the shaft body performed by this press-fit joining is applied to the joining of the ring and the outer ring of the bearing with the resin pulley according to the seventh embodiment.

  This press-fit joining is performed using a jig shown in FIGS. 11A and 11B. This jig includes an upper mold 51 made of chrome copper having a cylindrical hole 52 at the lower end, And a lower die 53 made of chrome copper provided with a columnar stepped portion 54 at the upper end. The upper mold 51 and the lower mold 53 each function as an electrode.

  In an example of this joining method, a predetermined press-fitting allowance is formed on the outer peripheral portion of the outer ring 2 and the inner peripheral portion of the ring 12, the outer ring 2 is fitted to the step portion 54 of the lower die 53, and the hole of the upper die 51 is inserted. The ring 12 is held concentrically with the outer ring 2 in the portion 52, and together with the upper mold 51 fixed to the press device (not shown), the ring 12 is lowered in the axial direction, so that the chamfered portion of the outer ring 2 and the ring 12 The inner peripheral edge (the press-fitting margin between the ring 12 and the outer ring 2) is brought into contact, and a predetermined pressure is applied to the outer ring 2 through the upper mold 51 by a press machine (FIG. 11 (a )reference).

  In the above state, a current is passed between the ring 12 and the outer ring 2 via the lower mold 53 and the upper mold 51 to start press-fitting. Immediately after the press-fitting, since the junction between the ring 7 and the outer ring 2 is narrow, current concentrates and the press-fitting allowance portion 21 is softened. In this softened state, the outer ring 2 is pushed into the ring 7 by the applied pressure.

  When the press-fitting is started, the inner peripheral portion of the ring 12 moves down the outer peripheral portion of the outer ring 2, the ring 12 is press-fitted into the outer ring 2, and the outer peripheral portion of the outer ring 2 is further pressed as shown in FIG. The inner periphery of the ring 12 is solid-phase bonded. With this press-fitting, the surface of the joint between the outer ring 2 and the ring 12 is squeezed, and the impurity layer (oil, surface treatment agent, oxide film, etc.) is removed and cleaned. Since bonding is performed with this clean surface structure, good bonding is not affected by an oxide film or the like, and the bonding strength between the ring 12 and the outer ring 2 is such that the ring 12 is pressed and fitted to the outside of the outer ring 2 only. Compared with the case where it fixes to a diameter part, it can raise.

  Further, in the joining with the press-fitting (press-fit joining), the softened press-fitting allowance part is plastically deformed, and the press-fitting allowance between the ring 12 and the outer ring 2 is eliminated.

  Thus, in the bearing with a resin pulley according to the seventh embodiment, the annular portion 12a of the ring 12 is firmly fixed to the outer peripheral portion of the outer ring 2, so that the rigidity of the annular portion 12 is increased, and the cylindrical shape of the ring 12 is increased. The portion 12b is not easily deformed in the radial direction, and the displacement of the outer ring 2 in the inner diameter direction of the track 8 can be further reduced.

The longitudinal cross-sectional view of the bearing with a resin pulley which concerns on 1st Embodiment Vertical sectional view of a bearing with a resin pulley according to a second embodiment Vertical sectional view of a bearing with a resin pulley according to a third embodiment Vertical sectional view of a bearing with a resin pulley according to a fourth embodiment Whole perspective view with a part cut out Vertical sectional view of a bearing with a resin pulley according to a fifth embodiment Whole perspective view with a part cut out Vertical sectional view of a bearing with a resin pulley according to a sixth embodiment a is an operation diagram conceptually showing projection welding between the metal ring and the outer ring, and b is an operation diagram conceptually showing a nugget between the metal ring and the outer ring. Vertical sectional view of a bearing with a resin pulley according to a seventh embodiment a is an operation diagram conceptually showing the press-fitting joint between the metal ring and the outer ring, and b is an operation diagram conceptually showing a joint state between the metal ring and the outer ring.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rolling bearing 2 Outer ring | wheel 3, 13, 23, 33, 43 Resin pulley member 4, 14, 24, 36, 46 Boss part 5, 15, 25, 37, 47 Outer peripheral part 6, 11, 21, 30, 40 Boundary part 7, 17, 27, 32, 42 Recess 8 Track 12, 22, 31, 41 Ring 12a Circular portion 12b Cylindrical portion 18, 28 Locking groove 19, 29, 39, 49 Radiating window 34, 44 Sleeve 35, 45 Flange 38, 48 Rib 51 Upper mold 52 Hole 53 Lower mold 54 Step n Nugget p Projection

Claims (7)

In a bearing with a resin pulley in which a resin pulley member is integrated with an outer peripheral portion of an outer ring of a rolling bearing,
A recess is provided in the entire circumference of the boundary between the resin pulley member and the outer ring, and the recess is provided at a position corresponding to the outer side in the radial direction of the track of the outer ring. Bearing with pulley.   The resin pulley member is integrated with the outer peripheral part of the outer ring via a metal ring fitted to the outer peripheral part of the outer ring, and the ring serves as the boundary part, and the outer peripheral part or inner peripheral part of the ring The bearing with a resin pulley according to claim 1, wherein the concave portion is provided on the entire circumference in at least one of the portions.   The bearing with a resin pulley according to claim 1 or 2, wherein an axial width of the recess is the same as an axial width of the race of the outer ring.   The ring has a sleeve fitted to the outer peripheral portion of the outer ring and a flange provided on the outer peripheral portion of the sleeve, and the concave portion is provided on the inner peripheral portion of the sleeve. 2. A bearing with a resin pulley according to 2.   The bearing with a resin pulley according to claim 4, wherein the flange is provided at a central portion in the axial direction of the sleeve.   The bearing with a resin pulley according to claim 4, wherein the flange is provided at one end of the sleeve.   The bearing with a resin pulley according to any one of claims 2 to 6, wherein a part of the ring is exposed to the outside from the resin pulley member to form a heat radiating portion.

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