JP4129630B2 - Resin pulley with bearing - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resin-equipped pulley with a bearing in which a synthetic resin pulley is integrally formed on the outer periphery of a bearing and prevents heat accumulation that occurs during rotation, thereby extending the bearing life.
[0002]
[Prior art]
In an internal combustion engine or the like, when driving auxiliary machines such as a cooling pump and a generator for power generation, power is taken out from the internal combustion engine, and these auxiliary machines are driven to rotate by belt driving. In such a belt drive, a radial ball bearing that rotates the outer ring is used as the idler pulley in particular. However, as a resin-integrated resin pulley with a resin-integrated type, a synthetic resin is injection-molded on the outer peripheral surface of the outer ring of the normal bearing. Produced and used. The bearing-equipped resin pulley integrally molded with the synthetic resin on the outer periphery of the outer ring is disposed around the internal combustion engine, and there is a problem in that the life is shortened due to the deterioration and consumption of the lubricant due to the generation of heat during rotation.
[0003]
Conventionally, various proposals have been made to solve the above-described problems of resin pulleys with bearings. For example, as shown in FIG. 3, an inner ring 14 composed of an inner rolling element guide member 12 and an inner resin case 13 of a resin molded product incorporating the inner rolling element guide member 12, an outer rolling element guide member 15 and a resin incorporating the inner ring 14 A plurality of spherical rolling elements 18 are disposed between an outer ring 17 formed of an outer resin case 16 of a molded product, and the inner rolling element guide member 12 and the outer rolling element guide member 15. The inner rolling member guide member 12 and the outer rolling member guide member 15 are in the longitudinal direction of the hollow cylindrical body and have rolling grooves (12a, 15a) in the center thereof, and at one end of the hollow cylindrical body, There has been proposed a bearing with a pulley made of resin, in which a form having an anti-slip of resin when incorporated in the resin cases 13 and 16 in the flanges 12b and 15b formed by bending the ends thereof is integrally formed (Patent Literature). 1).
Alternatively, the cylindrical portion 31 of the heat radiating metal plate 30 is exposed on the inner peripheral surface of the boss portion 21 of the resin pulley body 20, and an inner flange portion 31 a is formed at one end of the cylindrical portion 31. At least a part of the flange portion 32 of the heat radiating metal plate 30 is exposed to the outside at the web portion 23 of the pulley body 20 with the inner flange portion 31a being in close contact with both the outer peripheral surface 25a and the end surface 22b of the outer ring 25 of the rolling bearing 10. By exposing, the heat radiating metal plate 30 is brought into contact with the outer ring 25 under a large area to efficiently dissipate the heat in the rolling bearing 1, and the boss portion 21 and the rim portion 22 of the pulley body 20 are the web portion. There has been proposed a resin pulley having a structure that reduces the possibility of welding during injection molding by providing a structure that is connected to the entire surface without providing discontinuous portions in 23. See Patent Document 2).
[0004]
[Patent Document 1]
JP 2002-39193 A
[Patent Document 2]
JP 2001-355711 A
[0005]
[Problems to be solved by the invention]
As described above, the synthetic resin pulley integrally molded with the bearing outer ring has a problem that its life is shortened due to deterioration or leakage of grease due to heat. There is also a problem that there are many processed parts and the manufacturing cost required for manufacturing the bearing is high.
[0006]
The present invention has been made to address the above-described problems, and an object thereof is to provide a resin-made pulley with a bearing that has an excellent heat dissipation effect and can reduce manufacturing costs.
[0007]
[Means for Solving the Problems]
[0008]
That is, in order to solve the above-described problems, the invention according to claim 1 is characterized in that the rolling element raceway groove (2a) is provided on the outer peripheral surface and the inner ring (2) on the inner peripheral surface. ) And a plurality of rolling elements (3) arranged between the rolling element raceway grooves of the inner and outer rings. A resin-made pulley with a bearing comprising a resin pulley portion (4) integrally formed on the outer peripheral surface of the outer ring of the bearing,
The outer ring (1) is made of sheet metal,
At both ends of the outer ring (1), a heat dissipating part is formed to bend to the outer diameter side and cover a part (4) of the end face of the resin pulley part,
The outer ring (1) is formed by press molding together with the rolling element raceway groove (1a) of the outer ring (1) and both heat radiation portions.
[0009]
The invention according to claim 2 is the resin pulley with bearing according to claim 1, wherein a sealing member with a cored bar (9) is provided between both ends of the inner ring (2) and the outer ring (1). It is characterized by being press-fitted.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a bearing-equipped resin pulley according to the present invention and is a partial cross-sectional view in the axial direction. This resin pulley with bearing includes an outer ring 1, an inner ring 2, rolling elements (balls) 3, and a resin pulley portion 4 in which resin is integrally formed on the outer peripheral side of the outer ring by molding. The rolling elements 3 are held by a cage (not shown) at regular intervals in the circumferential direction. Further, V grooves 4a, 4a,... For locking a belt (not shown) are formed on the outer periphery of the resin pulley portion 4 so that the outer ring 1 rotates integrally with the resin pulley portion 4. is there.
[0011]
The outer ring 1 is manufactured by press molding with sheet metal. That is, the outer ring 1 is formed with a rolling element raceway groove 1a having a circular arc cross section on the inner peripheral surface by press molding, and a part of the side surface portion of the resin pulley portion 4 is covered at the outer ring end portion. In this way, the flange portions 1c and 1d are formed by bending toward the outer diameter side. As described above, in the resin pulley portion 4, the flange portions 1c and 1d are formed at the end portion of the outer ring 1 with its end surfaces exposed, and the resin pulley portion 4 is molded integrally. By configuring the outer ring 1 and the resin pulley portion 4 in this way, the heat radiation effect of heat generated during rotation is improved.
[0012]
Next, like the outer ring 1, the inner ring 2 is manufactured by press-molding a sheet metal, and a rolling element raceway groove 2a having a circular arc cross section corresponding to the rolling element raceway groove 1a of the outer ring is formed on the outer periphery. Is formed. At one end, a flange portion 2b is formed in the radially inward direction. A shaft 5 is fitted inside the inner ring 2 so as to abut on the flange portion 2b. A washer 6 is placed from the outside, and the inner ring 2 and the shaft 5 are fixed by a bolt 7.
[0013]
As described above, the outer ring 1 and the inner ring 2 are formed by press-molding sheet metal, and the rolling element raceway groove 1a on the inner peripheral surface of the outer ring 1 and the rolling element raceway groove 2a on the outer peripheral surface of the inner ring 2 are: Since the rolling elements 3 are arranged, the roundness must be ensured. Therefore, before assembling as a bearing, the pair with polishing is superfinished.
[0014]
In the annular space 8 between the outer ring 1 and the inner ring 2, sealing members 9 and 9 with a cored bar are disposed with the rolling elements 3 therebetween. As shown in FIG. 2, the sealing member 9 with a cored bar is composed of a cored bar 9a and a rubber seal portion 9b baked on the cored bar 9a. The rubber seal portion 9b is brought into contact with the inner peripheral surface 1e of the outer ring 1 or has a labyrinth structure.
[0015]
As described above, the resin pulley with a bearing according to the present invention can be a resin pulley with a bearing that has a relatively small number of processing steps and an excellent heat dissipation effect by adopting the above configuration. Further, the outer ring and the inner ring do not need a groove for the core of the sealing member, and can be manufactured at a low cost.
[0016]
【The invention's effect】
As described above in detail, according to the resin-made pulley with bearing of the present invention, there is provided a resin-made pulley that prevents the accumulation of heat generated during rotation, prevents the deterioration of grease, and prevents the life of the resin from decreasing. can do. Furthermore, by pressing, the number of processing steps can be reduced and the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 shows a bearing-equipped resin pulley according to the present invention, and is a partial cross-sectional view in the axial direction.
FIG. 2 is a view showing an arrangement state of sealing members arranged in an annular space between an outer ring and an inner ring of the resin pulley with bearing according to the present invention.
FIG. 3 is a partial sectional view in the axial direction of a conventional resin pulley with a bearing.
FIG. 4 is a partial cross-sectional view in the axial direction of a conventional resin pulley with a bearing.
[Explanation of symbols]
1 Outer ring (made of sheet metal)
DESCRIPTION OF SYMBOLS 1a Groove of cross-sectional arc shape for rolling element track 1c Flange part 1d Flange part 2 Inner ring (made of sheet metal)
2a Cross-section arc-shaped groove for rolling element raceway 2b Flange 3 Rolling element (ball)
4 Resin pulley 5 Shaft 9 Sealing member

Claims (2)

An inner ring in which rolling element raceway grooves are formed on the outer peripheral surface, an outer ring in which rolling element raceway grooves corresponding to the rolling element raceway grooves of the inner ring are formed on the inner peripheral surface, and both rolling element raceway grooves in the inner and outer rings A resin-made pulley with a bearing comprising a resin pulley portion integrally formed on an outer peripheral surface of an outer ring of a bearing having a plurality of rolling elements disposed therebetween,
The outer ring is made of sheet metal;
A heat dissipating part is formed at each end of the outer ring so as to bend to the outer diameter side and cover a part of the end face of the resin pulley part,
A resin pulley with a bearing, wherein the outer ring is formed by press molding together with a rolling element raceway groove and both heat radiation portions of the outer ring. The resin pulley according to claim 1,
A resin pulley with a bearing, wherein a sealing member with a core is press-fitted between both end portions of the inner ring and the outer ring.

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