JP4547952B2 - 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. The rubber seal connects the inner peripheral side annular portion fixed to the inner peripheral edge portion of the core metal, the outer peripheral side annular portion fixed to the outer peripheral edge portion of the core metal, and both annular portions on the outer side in the axial direction of the core metal. Consists of a plurality of connecting portions, and by removing the rubber portion between the connecting portions, the surface on the outer side in the axial direction of the rubber seal is provided with irregularities and the outer side in the axial direction of the core metal It is characterized in that a part of the surface is exposed .

  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 done. 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 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 rubber seal is provided with irregularities, the heat radiation effect is improved, so that deterioration of the rubber seal and grease lubrication due to temperature 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 the rolling bearing of the present invention. In the following description, the left and right refer to the left and right in FIG.

  FIG. 1 shows an electromagnetic clutch portion for transmitting or interrupting the rotational driving force of an engine to a compressor of an air conditioner. The electromagnetic clutch portion has a compressor housing (11) and an electromagnetic coil (13). And a stator (12) fixed to the housing (11), a U-shaped rotor (14) arranged so as to surround the stator (12), and a rotational drive of the engine fixed to the outer periphery of the rotor (14) A pulley (15) around which a multi-stage V-belt (16) that transmits force is wound, and a roller (14) that is arranged between the inner periphery of the rotor (14) and the housing (11) to rotatably support the rotor (14) A bearing (17) and an armature (18) that transmits rotation of the rotor (14) to the compressor shaft (19) by being attracted to or separated from the rotor (14) when the electromagnetic coil (13) is turned on / off. I have.

  The rolling bearing (17) is a four-point contact ball bearing. The inner ring (21), outer ring (22), balls (rolling elements) (23), balls ( 23) and a left and right seal member (25) (25) disposed between the left and right ends of both wheels (21) and (22), and the ball (23) includes an inner ring (21 ) And the raceway surface of the outer ring (22) at two locations. The inner ring (21) is press-fitted or fitted into the cylindrical end of the housing (11), and the outer ring (22) is press-fitted and fixed to the inner periphery of the rotor (14).

  An annular groove (27) (27) is formed in the inner diameter of the left end portion and the inner diameter of the right end portion of the outer ring (22), respectively. In addition, annular grooves (28) and (28) are formed on the outer diameter of the inner ring (21) facing the annular grooves (27) and (27), respectively.

  The left and right seal members (25), (25) are composed of a ring-shaped rubber seal (29) and a ring-shaped iron plate core (30) which is applied to the rubber seal (29) from the inside in the axial direction and reinforces it. They have the same shape and are arranged symmetrically. Each of the seal members (25) and (25) has an outer peripheral edge portion fitted into an annular groove (27) and (27) of the outer ring (22), and an inner peripheral edge portion of the annular ring (28) ( It is in sliding contact with 28).

  As shown in detail in FIG. 2, the rubber seal (29) of the seal member (25) includes an inner peripheral side annular portion (29a) fixed to the inner peripheral edge portion of the core metal (30), and an outer peripheral edge of the core metal (30). The outer peripheral side annular part (29b) fixed to the part and a plurality of connecting parts (29c) that connect the two annular parts (29a) (29b) to each other, between the connecting part (29c) and the connecting part (29c) By removing the portion (29d), the outer surface of the metal core (30) (the left side surface of the metal core (30) of the left seal member (25) and the metal core (30) of the right seal member (25)) Part of the right side) is exposed.

  According to the rolling bearing (17), the heat from the compressor is transmitted to the inner ring (21), and this heat is easily trapped in the rolling bearing (17), but a part of the outer surface of the core metal (30) By exposing, the heat dissipation effect is improved. Also, the four-point contact ball bearing (17) is difficult to apply to a compressor in that it generates a heat source due to a large slip at the contact portion between the race ring (21) (22) and the ball (23). However, application of the rubber seal (29) to the compressor is facilitated. As a result, it is possible to replace the bearing with the four-point contact ball bearing (17) in the electromagnetic clutch portion of the compressor using the double-row oblique contact ball bearing, which can be reduced in weight, compactness and cost. Become.

  3 and 4 show a second embodiment of the rolling bearing of the present invention. 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. 3, the rolling bearing (40) includes an inner ring (41), an outer ring (42), balls (rolling elements) (43), balls ( 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 detail in FIG. 4, the rubber seal (49) of the seal member (45) includes an inner peripheral side annular portion (49a) fixed to the inner peripheral edge portion of the core metal (50), and an outer peripheral edge of the core metal (50). The outer peripheral side annular part (49b) fixed to the part and a plurality of connecting parts (49c) connecting the two annular parts (49a) (49b) to each other, between the connecting part (49c) and the connecting part (49c) By removing the portion (49d), the outer surface of the metal core (50) (the left side surface of the metal core (50) of the left seal member (45) and the metal core (50) of the right seal member (45) Part of the right side) is exposed.

  According to the resin pulley device of this embodiment, since the heat conductivity of the resin pulley (46) is poor, heat tends to be accumulated in the rolling bearing (40). The exposed portion improves the heat dissipation effect and eliminates the disadvantages of the resin pulley (46). 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. 5 and 6 show a resin pulley device suitable for an idler pulley as a third 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. 5, 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.

 The resin pulley device is used as an idler pulley (idler or tensioner) of a belt transmission mechanism by fixing an inner ring (61) of a rolling bearing (60) to a tension adjusting unit. According to the resin pulley device of this embodiment, since the heat conductivity of the resin pulley (66) is poor, heat tends to be accumulated in the rolling bearing (60). The exposed portion improves the heat dissipation effect and eliminates the disadvantages of the resin pulley (66).

  In each of the above embodiments, the deleted portion (29d) between the connecting portion (29c) (49c) (69c) of the rubber seal (29) (49) (69) and the connecting portion (29c) (49c) (69c) ) (49d) and (69d) are not necessarily removed completely, and may be thin portions. For the thin-walled part, the space between the connecting part is deleted at the stage of forming the rubber seal (29) (49) (69), and this is applied to the metal core (30) (50) (70) and pressurized. It can be formed by heating while heating. The thickness of the thin part 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 connection part (thick part) (29c) (49c) (69c). The

  In the above embodiment, the inner circumferential side annular portions (29a) (49a) (69a) and the outer circumferential side annular portions (29b) (49b) (69b) of the rubber seals (29) (49) (69) are both. Although it has an annular shape with a certain thickness, these annular portions (29a) (49a) (69a) (29b) (49b) (69b) may also be provided with a deletion portion or a thin portion.

  Furthermore, the metal cores (30), (50), and (70) may be made of aluminum or copper (both including an alloy) instead of the iron plate, whereby the metal cores (30), (50) ( 70) The heat dissipation of itself is improved, and the seizure life is further improved.

  In the above embodiment, the rolling bearing in the apparatus using the resin pulley (15) (46) (66) has been described, but the above rolling bearing can of course be used as a general-purpose rolling bearing. Is possible.

It is a longitudinal section showing a 1st embodiment of a rolling bearing by this invention. It is sectional drawing which follows the II-II line of FIG. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the rolling bearing by this invention. It is sectional drawing which follows the IV-IV line of FIG. It is a longitudinal cross-sectional view which shows 3rd Embodiment of the rolling bearing by this invention. It is the same side view.

Explanation of symbols

(21) (41) (61) Inner ring
(22) (42) (62) Outer ring
(23) (43) (63) Ball (rolling element)
(25) (45) (65) Seal member
(29) (49) (69) Rubber seal
(30) (50) (70) Core

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 composed of a rubber seal and a metal core, and the rubber seal is a metal core. The inner peripheral side annular portion fixed to the inner peripheral edge portion, the outer peripheral side annular portion fixed to the outer peripheral edge portion of the core metal, and a plurality of connecting portions that connect the two annular portions to each other on the axial direction outside of the core metal, by rubber portion lying between the connecting portion and the connecting portion has been removed, along with irregularities in the axially outer surface of the rubber seal is provided to expose a part of the axially outer surface of the core metal A rolling bearing characterized by being configured as described above . The rolling bearing according to claim 1, wherein the metal core of the sealing member is made of a material having higher thermal conductivity than iron such as aluminum or copper. 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 .

Images