JP5629988B2 - Bearing device with pulley - Google Patents

Description

  The present invention relates to a bearing device with a pulley including, for example, a pulley around which a belt for driving auxiliary machinery of an automobile engine is wound.

2. Description of the Related Art In an auxiliary machine drive system for driving auxiliary machinery and the like of an automobile engine with a belt, a bearing device with a pulley is used to guide the running of the belt. Such a pulley-equipped bearing device includes a rolling bearing in which an inner ring is fixed to the engine side, and a resin pulley that is integrally formed on the outer peripheral side of the outer ring of the rolling bearing.
In the bearing device with a pulley, when dust, moisture, or the like enters the rolling bearing, the rolling bearing is damaged or rusted, and the life thereof is reduced. For this reason, some slinger made of an annular metal plate covering the annular openings at both ends of the rolling bearing is fixed to the end face of the inner ring, preventing dust and moisture from entering the inside of the rolling bearing and suppressing the life reduction. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 10-169759

The above-mentioned bearing device with a pulley has been reduced in weight by integrally molding the pulley with resin, but in recent years, in automotive parts, there has been a demand for weight reduction in order to realize further higher performance and lower fuel consumption. However, even in the bearing device with a pulley, further weight reduction has been demanded.
This invention is made | formed in view of such a situation, and it aims at providing the bearing apparatus with a pulley which can achieve weight reduction, suppressing lifetime reduction.

In order to achieve the above object, the present invention provides an inner ring, an outer ring, and a rolling bearing having a seal that closes an annular space between the inner ring and the outer ring, the inner ring being fixed to a fixing member, and the outer ring of the rolling bearing. And a resin pulley integrally formed on the outer peripheral side, wherein the resin pulley extends from the outer peripheral side in the axial direction of the rolling bearing toward the inner peripheral side in the radial direction, and both ends of the rolling bearing. A pair of slinger made of the same resin as the resin pulley is integrally formed to cover the annular opening of the seal member, and the distal end of the pair of resin slinger and the fixing member It features a labyrinth seal.

  According to the bearing device with a pulley configured as described above, a pair of resin slinger that forms a labyrinth seal with the fixing member is integrally formed with the resin pulley while covering the annular openings at both ends of the rolling bearing. Therefore, it is possible to prevent dust and moisture from entering the inside of the rolling bearing and to suppress the life reduction of the rolling bearing. Further, since the slinger is made of resin, it can be made lighter than a case where a slinger made of a metal plate is used as in the above-described conventional example.

  According to the bearing device with a pulley of the present invention, it is possible to further reduce the weight while suppressing the life reduction.

It is sectional drawing which shows the structure of the bearing apparatus with a pulley which concerns on one Embodiment of this invention. It is sectional drawing which shows the metal mold | die for insert molding for insert-molding the bearing apparatus with a pulley of this embodiment. It is sectional drawing which shows the structure of another bearing apparatus with a pulley.

Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a configuration of a bearing device with a pulley according to an embodiment of the present invention.
The pulley-equipped bearing device 1 is used for guiding the traveling of a belt in an accessory driving system for driving auxiliary machinery of an engine such as an automobile with a belt, and is fixed to the front side of the engine E. The support member 20 is fixed. The pulley-equipped bearing device 1 includes a rolling bearing 2 and a resin pulley 3 that is integrally formed on the outer peripheral side of the rolling bearing 2 and around which a belt B for driving auxiliary machinery is wound.

  The rolling bearing 2 includes an inner ring 4, an outer ring 5 to which a resin pulley 3 is integrally fixed, a plurality of balls 6 that are rolling elements interposed between the inner and outer rings 4 and 5, and a plurality of balls. A retainer 7 that holds 6 at equal intervals in the circumferential direction, and a seal member 8 that is fixed to the inner peripheral surface end of the outer ring 5 and closes the annular opening between the inner and outer rings 4, 5. It constitutes a deep groove ball bearing.

  The inner ring 4 is an annular member formed of bearing steel or the like, and is fitted on the outer peripheral surface 21 a of the support shaft 21 provided on the support member 20. A cylindrical first spacer 23 is interposed between the inner ring 4 and the base portion 22 of the support member 20 in contact with one end surface of the inner ring 4 and the base portion 22. 23 is positioned in the axial direction. Further, a screw portion 21b is formed at the distal end portion of the support shaft 21, and a flange nut 24 having a flange portion 24a is screwed to the screw portion 21b. The flange nut 24 is fastened to the axial engine E side with the flange portion 24a in contact with the other end surface of the inner ring 4, and the inner ring 4 and the first spacer 23 are connected to the flange portion 24a of the flange nut. And the base 22 are sandwiched and fixed.

  The bearing device with pulley 1 according to the present embodiment is fixed to the engine E by fixing the inner ring 4 to the support member 20 by the first spacer 23 and the flange nut 24, and the support member 20 and the first spacer 23 are fixed. The flange nut 24 constitutes a fixing member for fixing the inner ring 4.

  The outer ring 5 is an annular member using bearing steel or the like, and is relatively rotatable with the inner ring 4 in which a plurality of balls 6 are interposed. An annular seal groove 5a is formed at both ends of the inner peripheral surface of the outer ring 5, and a seal member 8 is fitted and fixed to the seal groove 5a so as to be integrally rotatable.

The seal member 8 includes a metal core 8a in which a metal plate or the like is formed in an annular shape, and a seal member 8b made of an elastic body such as synthetic rubber vulcanized along the outer surface of the metal core 8a. .
A seal lip 8 c is formed at the inner peripheral end of the seal member 8 b so as to be in sliding contact with the outer peripheral surface end of the inner ring 4 and seal between the inner and outer rings 4 and 5.

The resin pulley 3 is an annular member formed of, for example, a phenol resin mixed with a reinforcing material such as glass fiber, and is integrally formed with the outer ring 5 of the rolling bearing 2 by insert molding. It can rotate as a unit.
The resin pulley 3 is connected to the outer cylindrical portion 9 by the outer cylindrical portion 9 in which a large number of guide grooves 9 a are formed on the outer peripheral surface around which the belt B is wound, and the column portion 10, and on the inner peripheral side of the outer cylindrical portion 9. An inner cylindrical portion 11 disposed concentrically and a pair of resin slinger 12 extending radially inward from both axial ends of the inner cylindrical portion 11 are provided.

The inner cylindrical portion 11 is formed in close contact with the outer peripheral surface of the outer ring 5. A pair of resin slinger 12 extending from both axial ends of the inner cylindrical portion 11 is formed along the axial end surface of the rolling bearing 2, and the annular openings at both ends of the rolling bearing 2 are formed in the seal member 8. It covers from the outside.
Further, the resin slinger 12 is formed so that the front end thereof extends to immediately before the seal lip 8c provided on the seal member 8, and the seal lip 8c is not covered.

The resin slinger 12 on one side located on the side of the axial engine E is formed so that the clearance dimension S1 between the inner peripheral tip portion 12a and the outer peripheral surface of the first spacer 23 is about 0.1 mm. Has been. Thereby, the front-end | tip part 12a of the resin slinger 12 and the 1st spacer 23 comprise the labyrinth seal.
Also, in the other side of the resin slinger 12 located on the opposite side to the axial engine E side, the gap dimension S2 between the inner peripheral side tip portion 12a and the outer peripheral surface of the flange portion 24a is about 0.1 mm. It is formed to become. Thereby, the front-end | tip part 12a of the resin slinger 12 and the flange part 24a comprise the labyrinth seal.
In the present embodiment, the resin slinger 12 that forms a labyrinth seal together with the first spacer 23 and the flange portion 24 a is integrally formed with the resin pulley 3 while covering the annular opening of the rolling bearing 2. While allowing 5 to rotate relative to the inner ring 4, dust, moisture and the like are prevented from entering the inside of the rolling bearing 2.
In addition, in the pulley-equipped bearing device 1 of the present embodiment, the radial position of the distal end portion 12a of the resin slinger 12, the outer diameter of the first spacer 23, so that the pair of resin slinger 12 does not contact the end surface of the inner ring 4, The outer peripheral diameter of the flange portion 24a is set.

According to the pulley-equipped bearing device 1 configured as described above, the pair of resin slinger 12 that covers the annular openings at both ends of the rolling bearing 2 and that constitutes the labyrinth seal with the first spacer 23 and the flange portion 24 a is attached to the resin pulley 3. Since they are integrally formed, it is possible to prevent dust and moisture from entering the inside of the rolling bearing 2 and to suppress a reduction in the life of the rolling bearing 2. Further, since the resin slinger 12 is made of resin, it can be made lighter than the case where a slinger made of a metal plate is used as in the conventional example.
Moreover, by integrally forming the resin slinger 12, the number of parts constituting the pulley-equipped bearing device 1 can be reduced as compared with the conventional example, and the manufacturing cost can be reduced.

Here, in order to manufacture the bearing device 1 with a pulley of this embodiment, the method shown below is taken. FIG. 2 is a cross-sectional view showing an insert molding die for insert molding the pulley bearing device 1 of the present embodiment.
The insert molding die 50 includes a fixed side die 51 and a movable side die 52.
The movable side mold 52 includes an outer peripheral side mold 53 for forming the guide groove 9a of the resin pulley 3, an end surface side mold 54 for forming one end surface of the resin pulley 3, and a rolling bearing inside the mold. And a positioning member 55 for positioning 2.

The positioning member 55 includes a shaft portion 55a that is inserted into a hole portion 54a formed in the end surface side mold 54 while the rolling bearing 2 is externally fitted, and a roller bearing 2 that is provided at the tip of the shaft portion 55a. It has a clamping part 55b that clamps with the mold 54.
The holding portion 55b is provided with a protruding portion 55b2 that protrudes radially outward from the outer peripheral surface of the shaft portion 55a.
The positioning member 55 sandwiches the inner ring 4 between the projecting part 55b2 and the annular protrusion 54b that is formed at the peripheral edge of the hole part 54a of the end face side mold 54 and is in contact with one end face of the inner ring 4. The rolling bearing 2 is fixed. Further, the outer diameters of the protruding portion 55 b 2 and the annular protrusion 54 b are set to coincide with the inner peripheral diameter of the distal end portion 12 a of the resin slinger 12 of the resin pulley 3. Therefore, the protrusion 55b2 and the annular protrusion 54b cover both ends of the rolling bearing 2 up to a position where the protrusion 55b2 and the annular protrusion 54b come into contact with the outer surface 8d of the seal member 8. This prevents the molten resin from reaching the both end surfaces of the inner ring 4 and the seal lip 8c of the seal member 8 and solidifying.

In this embodiment, since the seal member 8 is fixed to the outer ring 5, the molten resin is prevented from flowing into the rolling bearing 2. Even if the seal member 8 and the resin are integrally solidified, the seal member 8 is fixed to the outer ring 5 and therefore does not hinder the relative rotation of the inner and outer rings 4 and 5.
Moreover, the front end surface 55b1 on the fixed mold 51 side of the sandwiching section 55b is formed in a convex curved surface shape, and is combined with the concave curved surface section 51a formed in the fixed mold 51 to allow the molten resin to be cavityd. A runner 56 and a gate 57 for supplying the gas to the inside 60 are constituted.
The stationary mold 51 is formed with a sprue 58 that communicates the runner 56 constituted by the concave curved surface portion 51a and the tip surface 55b1 of the clamping portion 55b with the outside.

In order to manufacture the pulley-equipped bearing device 1 of the present embodiment, first, the rolling bearing 2 is sandwiched and fixed by the positioning member 55 and the movable mold 52, and the movable mold 52 is fixed to the fixed mold 51. Combine with. Thereafter, the resin pulley 3 is integrally formed on the outer peripheral side of the rolling bearing 2 by supplying molten resin from the sprue 58 into the cavity 60.
As described above, the pulley-equipped bearing device 1 of the present embodiment can be obtained.

  As described above, according to the above manufacturing method, the inner ring 4 is sandwiched and fixed by the positioning member 55 and the movable mold 52 so as to sandwich and fix the inner ring 4 without hindering relative rotation between the inner and outer rings 4 and 5. The resin slinger 12 covering the annular opening between the inner and outer rings 4 and 5 can be integrally formed on the resin pulley. Further, since the positioning member 55 constitutes the runner 56 and the gate 57 together with the fixed-side mold 51, the structure of the insert molding mold 50 can be simplified.

FIG. 3 is a cross-sectional view showing the configuration of another pulley-equipped bearing device.
The difference between this embodiment and the above embodiment is that an annular groove 13 that is recessed toward the axial rolling bearing 2 side is formed on the axially outer end surface of the resin slinger 12, and The second spacer 30 and the third spacer 40 constituting the labyrinth are arranged at both end sides of the inner ring 4. Since other points are the same as those in the above embodiment, the description thereof is omitted.

  In the figure, a first spacer 23 and a second spacer 30 are interposed between the inner ring 4 and the base 22 of the support member 20. A third spacer 40 is interposed between the inner ring 4 and the flange nut 24. The flange nut 24 is tightened on the axial engine E side, and the spacers 23, 30, 40 and the inner ring 4 are sandwiched between the base portion 22 and the flange portion 24a. Accordingly, the inner ring 4 is sandwiched and fixed between the second spacer 30 and the third spacer 40 while being positioned in the axial direction by each spacer.

A second spacer 30 interposed between the inner ring 4 and the first spacer 23 is fitted on the outer peripheral surface 21 a of the support shaft 21 and is in contact with the inner ring 4 and the first spacer 23. An annular portion 32 extending radially outward from an end of the cylindrical portion 31 on the first spacer 23 side, and an annular protrusion 33 projecting from the radially outer end of the annular portion 32 toward the axial rolling bearing 2 side. Have.
The annular portion 32 is formed so as to be flush with the axial end surface of the inner cylindrical portion 11.
The annular protrusion 33 is provided with a slight gap with respect to the bottom surface, inner peripheral surface, and outer peripheral surface of the annular groove 13 formed in the resin slinger 12 on one side. The annular portion 32 and the cylindrical portion 31 are also provided with a slight gap with respect to the distal end portion 12 a of the resin slinger 12. In addition, as this slight clearance, the mutual space | interval is set to about 0.1 mm, for example.
As described above, the second spacer 30 and the annular groove 13 and the front end portion 12a of the resin slinger 12 on one side form a labyrinth seal with a slight gap therebetween.

The third spacer 40 interposed between the inner ring 4 and the flange nut 24 is fitted on the outer peripheral surface 21 a of the support shaft 21 and is in contact with the inner ring 4 and the flange nut 24. The cylindrical portion 41, the annular portion 42 extending radially outward from the end of the cylindrical portion 41 on the flange nut 24 side, and the annular protrusion 43 projecting from the radially outer side of the annular portion 42 toward the axial rolling bearing 2. And have.
The annular portion 42 is formed so as to be flush with the axial end surface of the inner cylindrical portion 11.
The annular protrusion 43 is provided with a slight gap with respect to the bottom surface, inner peripheral surface, and outer peripheral surface of the annular groove 13 formed in the resin slinger 12 on the other side. The annular portion 42 and the cylindrical portion 41 are also provided with a slight gap with respect to the tip end portion 12a of the resin slinger 12 on the other side. Note that, as described above, the slight gap is set to about 0.1 mm between each other.
As described above, the third spacer 40 and the annular groove 13 and the tip end portion 12a of the resin slinger 12 on the other side form a labyrinth seal with a slight gap therebetween.

  In this embodiment, as described above, the labyrinth seal is configured with the resin slinger 12 in addition to forming the resin slinger 12 with the annular groove 13 in the resin pulley 3 while covering the annular opening of the rolling bearing 2. Since the second spacer 30 and the third spacer 40 are provided, the path of the labyrinth can be made longer, and dust and moisture can be more effectively prevented from entering the inside of the rolling bearing 2. it can.

The present invention is not limited to the above embodiment. For example, in the said embodiment, although the case where the resin slinger 12 comprised the labyrinth seal between the 1st spacer 23 and the flange nut 24, as an object member which comprises a labyrinth seal with the resin slinger 12, Any member may be used as long as it constitutes a fixing member for fixing the inner ring 4. For example, when a washer, a collar, or the like is disposed to clamp and fix the inner ring 4, a space between the washer and the collar is used. Thus, a labyrinth seal can be formed.
Further, the support shaft 21 may be provided with the first spacer 23 integrally, that is, a step for sandwiching the inner ring 4 may be provided on the support shaft 21.
Further, in the above embodiment, the screw portion 21 b provided at the tip of the support shaft 21 is exemplified as having a nominal diameter smaller than the outer diameter of the support shaft 21. It is good also as this screw part 21b.

Moreover, in the said embodiment, although the case where the resin pulley 3 was formed with the phenol resin which mixed the reinforcing material was illustrated, it can also form using a nylon resin.
Moreover, in the said embodiment, although the case where the single row deep groove ball bearing was used as the rolling bearing 2 was illustrated, for example, a cylindrical roller bearing, a tapered roller bearing, etc. may be used, and a double row rolling bearing and You can also

DESCRIPTION OF SYMBOLS 1 Bearing apparatus with pulley 2 Rolling bearing 3 Resin pulley 4 Inner ring 5 Outer ring 12 Resin slinger 12a Tip part 20 Support member (fixing member)
21 Support shaft (fixing member) 23 First spacer (fixing member)
24 Flange nut (fixing member)

Claims (1)

A rolling bearing having an inner ring and an outer ring, and a seal that closes an annular space between the inner ring and the outer ring, and the inner ring is fixed to a fixing member;
In a bearing device with a pulley comprising a resin pulley integrally molded on the outer ring outer peripheral side of the rolling bearing,
The resin pulley includes a pair of the resin that extends from the outer peripheral side in the axial direction of the rolling bearing toward the inner peripheral side in the radial direction, covers the annular openings at both ends of the rolling bearing , and contacts the side surfaces of the seal member A slinger made of the same resin as the pulley is integrally formed,
A bearing device with a pulley, wherein a tip of an inner peripheral side of the pair of resin slinger and the fixing member constitute a labyrinth seal.

Images