JP4561142B2 - Rolling bearing and resin pulley apparatus using the same - Google Patents

Description

  The present invention relates to a rolling bearing and a resin pulley apparatus using the rolling bearing, and more particularly to a rolling bearing suitable for use in a compressor pulley and an idler pulley of a car air conditioner and a resin pulley apparatus using the rolling bearing.

Conventionally, as a rolling bearing used for a compressor pulley of a car air conditioner, a four-point contact ball bearing having an inner ring, an outer ring, a ball disposed between the center portions of both wheels, and a seal member disposed between end portions of both wheels. Is known (Patent Document 1).
JP 2002-130290 A

  In a rolling bearing used for a compressor pulley of a car air conditioner, heat from the compressor body is transmitted to the bearing, so that the temperature inside the rolling bearing tends to increase. In addition, when a four-point contact ball bearing is used, since the slip at the contact portion between the race and the ball is large, this becomes a heat source. Furthermore, when the pulley is made of resin, the heat inside the bearing is less likely to escape compared to a metal pulley with good heat transfer. Therefore, when a four-point ball bearing is used in a compressor that uses a resin pulley, the temperature inside the rolling bearing increases, which may cause the rubber seal of the rolling bearing to be easily deteriorated, and lubrication of the rolling bearing grease. There may be a problem that the life of seizure is shortened due to defects.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a rolling bearing having a high heat dissipation effect and therefore preventing deterioration of a rubber seal and having a long seizure life, and a resin pulley device using the same.

A rolling bearing according to the present invention is a rolling bearing having an inner ring, an outer ring, a rolling element disposed between central portions of both wheels, and a seal member disposed between end portions of both wheels. The seal member includes a rubber seal and a metal core. becomes, the core metal is circular plate portion, a short cylindrical portion continuous to the outer peripheral edge of the disk portion, and the end of the short cylindrical portion provided so as to extend radially outward and bent into contact with the outer ring edge The rubber seal is bonded to the outer peripheral portion of the short cylindrical portion of the core metal and is press-fitted into an annular groove provided in the outer ring, and the inner ring is bonded to the inner peripheral edge portion of the disk portion of the core metal. A slidable contact portion that is slidably contacted, and a disc portion that connects the fitting portion and the slidable contact portion and is bonded to the disc portion of the core metal. By providing notches at predetermined intervals in the direction, irregularities are provided on the outer surface of the rubber seal. Together it is characterized in that the portion of the axial outer surface of the core have been made so as to expose.

  The contact between the bent edge of the core metal and the outer ring or inner ring is preferably direct contact, but to the extent that heat can be easily transferred between the bent edge of the core metal and the outer ring or inner ring, A thin part of the rubber seal may be interposed between the two. Further, when press-fitting and fixing the seal member to the inner ring or the outer ring, at least a part of the bent edge portion of the core metal may be in direct contact with the inner ring or the outer ring, or the rubber seal adhered to the bent edge portion of the core metal The portion may be press-fitted into the inner ring or the outer ring.

  The cored bar is composed of, for example, a disk part, a short cylindrical part connected to the outer peripheral edge part of the disk part, and a bent edge provided so as to extend radially outward at an end part of the short cylindrical part. The The shape of the bent edge in this case is a disc shape or a gear shape in which notches are provided at equal intervals in the disc portion. The short cylindrical portion of the core metal is not necessary, and the core metal is composed of a disk portion and a bent edge portion, and the shape of the bent edge portion may be various shapes such as a circular arc shape in cross section. .

  In a sealing member composed of a rubber seal and a cored bar, the cored bar is usually composed of a disc part and a short cylindrical part connected to the outer peripheral edge of the disc part, and the cored bar directly contacts the outer ring or the inner ring. Rather, it is supported by the outer ring or the inner ring through a rubber seal part bonded to the short cylindrical part. For this reason, heat radiation from the outer ring or the inner ring is suppressed by the rubber seal. On the other hand, by providing a bent edge portion in contact with the outer ring or the inner ring on the core bar, more heat of the bearing is radiated through the core bar.

  Normally, one seal member is arranged between the end portions of both wheels, and at least one of them (the side on which heat easily accumulates) is provided with irregularities on the outer surface (the outer surface in the axial direction) of the rubber seal. It is preferable that For example, the outer peripheral edge of the seal member is fitted in an annular groove formed on the inner diameter of the outer ring, and the inner peripheral edge is slidably contacted with the outer diameter of the inner ring, thereby ensuring the sealing performance.

  The uneven shape of the rubber seal is not particularly limited. For example, the rubber seal is composed of an inner circumferential side annular portion, an outer circumferential side annular portion, and a coupling portion that couples the two annular portions, and the coupling portion has the same thickness as the two annular portions. The thick-walled portion and the thin-walled portion thinner than this are repeatedly formed.

  The cored bar is composed of a disc part, a short cylindrical part connected to the outer peripheral edge of the disc part, and a plurality of bent edges provided on the end of the short cylindrical part so as to extend radially outward. Is bonded to the outer peripheral portion of the short cylindrical portion of the core metal and press-fitted into an annular groove provided in the outer ring, and is bonded to the inner peripheral edge portion of the disk portion of the core metal and is slidably contacted with the inner ring. There is a case in which a filling portion that has a sliding contact portion and fills a gap between adjacent bent edges of the cored bar to improve adhesion to the cored bar is provided integrally with the fitting portion. When the bent edge of the core metal is directly in contact with the outer ring or the inner ring, the adhesiveness between the rubber seal and the core metal is slightly lowered, but there is a gap between a plurality of bent edges, that is, the respective bent edges. At the same time, a part of the rubber seal is accommodated in the gap as a filling portion, thereby preventing the adhesiveness from being lowered.

  The rolling bearing according to the present invention is preferably used in combination with a resin pulley. In this case, the pulley has, for example, a small diameter portion and a large diameter portion, and a plurality of V grooves in the circumferential direction are formed on the outer diameter of the large diameter portion. And as for a rolling bearing, the outer ring | wheel is fixed to the small diameter part internal diameter of a pulley. In order to fix the outer ring and the pulley, the outer ring may be press-fitted into the pulley, or the pulley may be injection molded into the outer ring. In the former case, it is preferable to provide an inward flange portion for positioning when the outer ring is pressed into the small diameter portion of the pulley. In the latter case, the outer diameter of the outer ring is not movable in the axial direction at the small diameter portion of the pulley. It is preferable that an annular recess to be fitted in is formed.

  The resin pulley device composed of the rolling bearing and the pulley thus obtained is used as an idler pulley or a compressor pulley. At this time, in the idler pulley, for example, a stepped or tapered mounting hole is formed in the inner ring, and in the compressor pulley, the inner ring is formed in a cylindrical shape, and the cylindrical portion of the housing that rotatably supports the drive shaft of the compressor is formed. Fixed.

  In the above rolling bearing, it is preferable that at least a part of the outer surface of the core bar is exposed. For this purpose, the rubber seal is composed of an inner peripheral annular portion, an outer peripheral annular portion, and a plurality of connecting portions that connect the annular portions, and the rubber portions between the connecting portions are removed. That's fine.

  If it does in this way, since a metal core part will contribute to heat dissipation, the heat dissipation effect will improve further and it will be possible to prolong the seizure life.

  Various types of rolling bearings are possible. Of these, the four-point contact ball bearing has a relatively large slip at the contact portion between the race and the ball, and the heat generation is relatively large. It is suitable for adopting the above configuration. The four-point contact ball bearing is designed so that the ball contacts the inner ring raceway surface at two points and also contacts the outer ring raceway surface at two points. It can be used instead of a ball bearing. And since the increase in the heat_generation | fever at the time of replacement is suppressed by the improvement of the heat dissipation effect, it can apply easily also to the location which receives heat easily.

  The rolling bearing can be used in various ways. For example, if it is used in the vicinity of a device that serves as a heat source and uses a resin pulley, such as a compressor, heat is accumulated. This is preferable in that it can compensate for the drawback of the resin pulley.

  In the rolling bearing, the core metal of the seal member may be made of a material having a higher thermal conductivity than iron such as aluminum or copper. If it does in this way, in addition to the improvement of the heat dissipation of a sealing member, the heat dissipation of the metal core itself will improve, and the seizure life can be further prolonged.

  According to the rolling bearing of the present invention, since the bent edge that contacts the outer ring or the inner ring is provided on the cored bar, more heat is dissipated through the cored bar so that the heat dissipation effect is improved and the temperature is increased. Deterioration of the rubber seal and poor lubrication of grease due to the rise are suppressed, and the seizure life is extended.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 show a first embodiment of a rolling bearing according to the present invention and a resin pulley apparatus using the rolling bearing. In the following description, the left and right refer to the left and right in FIG.

  This embodiment shows a resin pulley device suitable for a compressor, and the resin pulley device includes a resin pulley body (46) and a rolling bearing (40) incorporated therein.

  As shown in FIG. 1, the rolling bearing (40) includes an inner ring (41), an outer ring (42), a ball (rolling element) (43), a ball ( 43) and a left and right seal member (45) (45) disposed between the left and right ends of both wheels (41) (42).

  The pulley (46) is made of phenol resin or the like, and has a small diameter portion (46a), an intermediate diameter portion (46b), and a large diameter portion (46c) that are concentric with each other. A plurality of circumferential V-grooves (46d) are formed on the outer diameter of the large-diameter portion (46c). An inward flange portion (46e) is provided at the right end of the small diameter portion (46a), and the outer ring (42) of the rolling bearing (40) is press-fitted into the inner diameter of the small diameter portion (46a) from the left. The positioning is performed by the inward flange portion (46e).

  An annular groove (47) (47) is formed in the inner diameter of the left end portion and the inner diameter of the right end portion of the outer ring (42), respectively. Also, annular grooves (48) and (48) are formed on the outer diameter of the inner ring (41) facing the annular grooves (47) and (47), respectively.

  The left and right seal members (45) and (45) are composed of a ring-shaped rubber seal (49) and a ring-shaped iron plate core (50) which is applied to the rubber seal (49) from the inside in the axial direction and reinforces it. They have the same shape and are arranged symmetrically. Each of the seal members (45) and (45) has an outer peripheral edge portion fitted into the annular groove (47) (47) of the outer ring (42), and an inner peripheral edge portion of the annular groove (48) ( 48).

  As shown in FIGS. 2 and 3, the cored bar (50) includes a disc portion (51), a short cylindrical portion (52) extending inward in the axial direction continuously to the outer peripheral edge portion of the disc portion (51), And a plurality of bent edges (53) provided so as to extend radially outward from the axially inner end of the short cylindrical portion (52). The bent edge (53) is brought into direct contact with the peripheral walls of the annular grooves (47) and (47) of the outer ring (42).

  The rubber seal (49) is bonded to the outer peripheral portion of the short cylindrical portion (52) of the core metal (50) and is fitted into the annular groove (47) provided in the outer ring (42), and the fitting portion (54), A sliding contact portion (55) that is bonded to the inner peripheral edge portion of the disc portion (51) of the core metal (50) and is slidably contacted with the annular groove (48) of the inner ring (41), and a fitting portion (54) A disc part (56) connected to the disc part (51) of the cored bar (50) and connected to the sliding contact part (55), and the fitting part (54) has a cored bar ( A filling portion (57) that fills a gap between adjacent bent edge portions (53) of 50) and improves the adhesion to the core metal (50) is integrally provided. Further, the disc part (56) is provided with a notch part (56a) at a predetermined interval in the circumferential direction, whereby the outer surface of the cored bar (50) (the left seal member (45) The left side surface of the core metal (50) and the right side surface of the core metal (50) of the right seal member (45) are partially exposed.

  According to the resin pulley device of this embodiment, since the heat conductivity of the resin pulley (46) is poor, heat is easily trapped in the rolling bearing (40), but the bent edge of the core metal (50) ( 53) is in direct contact with the outer ring (42) and part of the outer surface of the metal core (50) is exposed, improving the heat dissipation effect and demerit of the resin pulley (46). It has been resolved. Therefore, this resin pulley device can be easily applied to a compressor.

  The resin pulley is also used in places other than the compressor. FIGS. 4 and 5 show a resin pulley device suitable for an idler pulley as a second embodiment of the rolling bearing of the present invention.

  In the figure, the resin pulley device includes a resin pulley body (66) and a rolling bearing (60) incorporated therein.

  As shown in FIG. 4, the rolling bearing (60) includes an inner ring (61), an outer ring (62), balls (rolling elements) (63), balls ( 63) and a left and right seal member (65) (65) disposed between the left and right ends of both wheels (61) and (62), and the outer diameter of the outer ring (62). A resin pulley (66) is fixed to the base.

  The pulley (66) is made of phenol resin or the like, and has a small diameter portion (66a) and a large diameter portion (66b) that are concentric with each other. In this embodiment, the outer ring (62) is not press-fitted into the pulley (66), but the pulley (66) is integrally formed with the outer ring (62) by injection molding to the outer diameter of the outer ring (62). Yes. A plurality of circumferential V-grooves (66c) are formed on the outer diameter of the large diameter portion (66b) of the pulley (66), and an outer ring is provided on the inner diameter of the small diameter portion (66a) of the pulley (66). (62) An annular recess (66d) into which the outer diameter is fitted so as not to move in the axial direction is formed.

  As shown in detail in FIG. 5, the core metal (70) includes a disc portion (71), a short cylindrical portion (72) extending inward in the axial direction, connected to the outer peripheral edge portion of the disc portion (71), and a short cylinder portion (72). It consists of a plurality of bent edges (73) provided so as to extend radially outward from the axially inner end of the cylindrical portion (72). The bent edge (73) is brought into direct contact with the peripheral walls of the annular grooves (67) and (67) of the outer ring (62). The rubber seal (69) is bonded to the outer peripheral portion of the short cylindrical portion (72) of the core metal (70) and is fitted into the annular groove (67) provided in the outer ring (62), and the fitting portion (74), A sliding contact portion (75) that is bonded to the inner peripheral edge of the disc portion (71) of the core metal (70) and is slidably contacted with the annular groove (68) of the inner ring (61); and a fitting portion (74); A disc part (76) connected to the disc part (71) of the metal core (70) connected to the sliding contact part (75), and the fitting part (74) has a metal core ( A filling portion (77) that fills the gap between the adjacent bent edge portions (73) of 70) and improves the adhesion to the cored bar (70) is integrally provided. Further, the disc part (76) is provided with a notch part (76a) at a predetermined interval in the circumferential direction, whereby the outer surface of the cored bar (70) (the left sealing member (65) The left side surface of the core metal (70) and the right side surface of the core metal (70) of the right seal member (65) are partially exposed.

  According to the resin pulley device of this embodiment, since the heat conductivity of the resin pulley (66) is poor, the rolling bearing (60) tends to accumulate heat, but the bent edge ( 73) is in direct contact with the outer ring (62) and part of the outer surface of the metal core (70) is exposed, improving the heat dissipation effect and demerit of the resin pulley (46). It has been resolved.

  In each of the embodiments described above, the notches (56) and (76) provided in the disk portions (56) and (76) of the rubber seals (49) and (69) do not necessarily need to be completely removed, and are thin-walled. It is good also as a part. For the thin part, the part corresponding to the notch part (56) (76) is deleted at the stage of forming the rubber seal (49) (69), and this is applied to the core metal (50) (70) while pressing. It can be formed by heating. The thickness of the thin portion is, for example, 0.2 mm or less (more preferably 0.1 mm or less), or 1/3 or less of the thickness of the thick portion of the disk portions (56) and (76). The bent edges (53) and (73) of the core bars (50) and (70) are in direct contact with the peripheral walls of the annular grooves (47) and (67) of the outer rings (42) and (62). The outer ring (42) (62) may be brought into contact with the outer ring (42) (62) through a thin portion of 2 mm or less (more preferably 0.1 mm or less), in short, the core metal (50) (70) and the outer ring (42 ) (62) is not thermally insulated, but the contact between the bent edges (53) (73) of the core metal (50) (70) and the outer ring (42) (62) is either Any contact that facilitates the transfer of heat to the other.

  Furthermore, the cored bar (50) (70) may be made of aluminum or copper (both of which includes an alloy) instead of the iron plate, and thereby the heat dissipation of the cored bar (50) (70) itself. And the seizure life is further improved.

  In the above embodiment, the rolling bearing in the apparatus using the resin pulley (46) (66) has been described. However, the above rolling bearing can of course be used as a general-purpose rolling bearing. .

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows 1st Embodiment of the rolling bearing by this invention and the resin pulley apparatus using the same. It is sectional drawing which follows the II-II line of FIG. It is an expanded longitudinal cross-sectional view of the principal part of a rolling bearing. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the rolling bearing by this invention and the resin pulley apparatus using the same. FIG.

Explanation of symbols

(40) (60) Rolling bearing
(41) (61) Inner ring
(42) (62) Outer ring
(43) (63) Ball (rolling element)
(45) (65) Seal member
(46) (66) Resin pulley body
(49) (69) Rubber seal
(50) (70) Core
(56) (76) Disc
(56a) (76a) Notch

Claims (3)

In a rolling bearing having an inner ring, an outer ring, a rolling element disposed between central portions of both wheels, and a seal member disposed between end portions of both wheels, the seal member is formed of a rubber seal and a cored bar, and the cored bar is a circle. plate portion, made from the short cylindrical portion continuous to the outer peripheral edge of disk portion, and the end of the short cylindrical portion provided so as to extend radially outward and bent into contact with the outer ring rim, rubber seal, core A fitting portion that is bonded to the outer peripheral portion of the gold short cylindrical portion and press-fitted into an annular groove provided in the outer ring, and a slidable contact that is bonded to the inner peripheral edge portion of the disk portion of the core metal and slidably contacts the inner ring. And a disc portion that connects the fitting portion and the sliding contact portion and is bonded to the disc portion of the metal core, and the rubber seal disc portion is notched at predetermined intervals in the circumferential direction. By providing the portion, the outer surface of the rubber seal is uneven, and the axial outer surface of the cored bar Rolling bearing wherein the parts have been made so as to expose. The bent edge of the cored bar is a gear-like shape in which notches are provided at equal intervals in the disk part, thereby forming a gap in the bent edge of the cored bar, and the fitting part of the rubber seal rolling filling section to improve the adhesion between the metal core to fill the gap in fold bent edge of the metal core according to claim 1 which is integrally provided. A resin pulley apparatus comprising: a resin pulley body having a plurality of V grooves formed on an outer diameter; and a rolling bearing fixed to the inner diameter of the pulley body, wherein the rolling bearing is the rolling bearing according to claim 1 or 2 .

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