JP2011112192A - Creep prevention rolling bearing - Google Patents

Abstract

An object of the present invention is to provide a creep-proof rolling bearing that avoids an increase in work in the assembly process, is inexpensive, and has a creep performance higher than that of the prior art.
A creep-preventing rolling bearing of the present invention is capable of rolling between an outer ring having an outer ring raceway on an inner peripheral surface, an inner ring having an inner ring raceway on an outer peripheral surface, and the outer ring raceway and the inner ring raceway. A plurality of rolling elements 4 provided on the holder, and a cage 5 that holds the rolling elements 4. A rubber anti-creep member 16 is formed integrally with the outer ring 13 by vulcanization from the outer peripheral surface to the side surface of the outer ring 13. As the material of the creep preventing member 16, rubber having a thermal expansion coefficient larger than that of the aluminum alloy that is the material of the housing 9 is used.
[Selection] Figure 1

Description

  The present invention relates to an anti-creep rolling bearing. More specifically, the present invention relates to a rolling bearing capable of effectively preventing creep by being incorporated in a rotation support portion of various auxiliary equipment for automobiles such as an alternator and a car air conditioner compressor.

  In general, various auxiliary machines for automobiles often incorporate a rolling bearing for supporting a rotating shaft inside a housing. In the assembled state, the outer ring constituting the rolling bearing is fitted and fixed inside the housing by an interference fit.

  By the way, the thermal expansion coefficient of the aluminum alloy widely used as the material of the housing is larger than the thermal expansion coefficient of the bearing steel constituting the outer ring of the rolling bearing. For this reason, when the rolling bearing is fixed to the inner ring housing in the aluminum alloy housing, when the temperature rises, the allowance of the outer ring relative to the housing is reduced or lost, and so-called creep occurs in which the outer ring rotates inside the housing. In addition, rattling may occur in the rotation support portion due to the rolling bearing. In addition, when creep occurs, the inner peripheral surface of the housing wears with the rotation of the outer ring, and the rattling tends to gradually increase.

  As a technique for preventing such creep, for example, a creep preventing rolling bearing 1 as shown in FIG. 5 is known. The anti-creep rolling bearing 1 holds an inner ring 2 that is a rotating ring, an outer ring 3 that is a fixed ring, a plurality of rolling elements 4 that are rotatably provided between the inner and outer rings 2 and 3, and the rolling element 4. The cage 5 is provided. Further, the rotary shaft 8 is fitted to the inner ring 2 so as to be integrally rotatable, and the outer ring 3 is fitted to a fitting portion inner peripheral surface 9a provided in an aluminum alloy housing 9, whereby the rotary shaft 8 is rotated. Supports freely. Circumferential grooves 7 and 7 are provided on the outer peripheral surface of the outer ring 3 symmetrically with respect to the axial center, and the peripheral grooves 7 and 7 are made of a synthetic resin having a larger thermal expansion coefficient than the aluminum alloy housing. Anti-creep members 6 and 6 are arranged. The creep prevention members 6 and 6 are disposed so as to be interposed between the circumferential grooves 7 and 7 of the outer ring 3 and the fitting portion inner peripheral surface 9a of the housing 9, and these creep prevention members 6 and 6 are at an ambient temperature. By expanding or contracting in accordance with the change, the allowance of the outer ring 3 with respect to the housing 9 is ensured, and a predetermined creep torque is generated to maintain the mounting state of the outer ring 3 with respect to the housing 9.

  Such a creep-preventing rolling bearing is configured by forming a creep-preventing member with a resin band and fitting it into a circumferential groove, for example, as in the technique described in Patent Document 1, or for example, Patent Document 2 As in the prior art, a ring-shaped creep preventing member is formed in the circumferential groove by injection molding (for example, insert molding).

JP 09-314695 A JP 2003-287043 A

  However, these prior arts require a process for attaching an outer ring circumferential groove to the bearing outer ring. In addition, when the synthetic resin band is used, there is a problem that the number of assembling parts is increased by one, so that the number of assembling steps and the risk of misassembly are increased.

  Further, in these anti-creep ball bearings, the area that functions to prevent creep depends on the size of the anti-creep member, so in various auxiliary equipment for automobiles such as current alternators where the usage conditions become severe, There is a problem of insufficient creep prevention performance.

  Accordingly, an object of the present invention is to provide an anti-creep rolling bearing that does not increase the work in the assembly process, is inexpensive, and has an anti-creep performance higher than that of the prior art.

  In order to achieve the above object, a creep-preventing rolling bearing according to the present invention comprises an outer ring having an outer ring raceway on an inner peripheral surface, an inner ring having an inner ring raceway on an outer peripheral surface, and between the outer ring raceway and the inner ring raceway. In the anti-creep rolling bearing comprising a plurality of rolling elements provided in a freely movable manner, a cage for holding the rolling elements and an anti-creep member, the anti-creep member is made of rubber, and the outer peripheral surface of the outer ring And at least an axial width equal to or greater than the width of the outer ring.

  According to the present invention, unlike the conventional anti-creep rolling bearing, it is not necessary to install a groove portion for storing the anti-creep member, so that the processing cost can be reduced.

  In addition, since the anti-creep member is integrally formed with the bearing compared to the conventional anti-creep rolling bearing made of a resin band, it is possible to reduce the number of parts, simplify the assembly process, and avoid dangers such as assembly errors.

  Further, by making the creep preventing member made of rubber having a friction coefficient larger than that of the synthetic resin, it is possible to obtain a higher anti-creep performance than the conventional creep preventing rolling bearing using the synthetic resin creep preventing member.

  Furthermore, since the anti-creep member has a width equal to or greater than the bearing width, the area that functions to prevent creep is large, and the anti-creep function can be sufficiently exerted even under severe use conditions. .

It is a figure which shows sectional drawing which shows the principal part structure which assembled | attached the creep prevention rolling bearing by 1st Embodiment of this invention to the housing and the rotating shaft. FIG. 5 is a cross-sectional view showing a configuration of a main part in which a creep preventing rolling bearing according to a second embodiment of the present invention is assembled to a housing and a rotating shaft. It is a figure which shows sectional drawing which shows the principal part structure which assembled | attached the creep prevention rolling bearing which is a prior art to a housing and a rotating shaft.

  FIG. 1 shows a first embodiment of the present invention. The anti-creep rolling bearing of the present invention prevents the occurrence of so-called creep in which the outer ring of the rolling bearing fitted and fixed inside the housing made of aluminum alloy and having a cylindrical inner peripheral surface rotates with respect to the housing. Is.

  The anti-creep rolling bearing 11 of the present invention is provided between an outer ring 13 having an outer ring raceway on an inner peripheral surface, an inner ring 2 having an inner ring raceway on an outer peripheral surface, and the outer ring raceway and the inner ring raceway. A plurality of rolling elements 4 and a cage 5 that holds the rolling elements 4 are provided. A rubber anti-creep member 16 is formed integrally with the outer ring 13 by vulcanization from the outer peripheral surface to the side surface of the outer ring 13.

  As the material of the creep preventing member 16, it is preferable to employ a fluorine-based rubber having excellent heat resistance. However, it is not limited to fluorine rubber, and for example, butyl rubber, ethylene / propylene rubber, chloroprene rubber, silicone rubber, PBT elastomer, polyamide elastomer and the like can be employed.

  The anti-creep rolling bearing 11 has the inner ring 2 fitted to the fitting portion outer peripheral surface 8a of the rotary shaft 8 so as to be integrally rotatable, and the outer ring 13 is provided in the aluminum alloy housing 9 via the creep preventing member 16. The rotary shaft 8 is rotatably supported by fitting to the fitting portion inner peripheral surface 9a. At this time, the creep preventing member 16 is pressed by the fitting portion inner peripheral surface 9a of the housing and the outer ring 13, elastic force is generated in the radial direction, and the housing 9 and the outer ring 13 can be fixed by the frictional engagement force.

  Here, the thermal expansion coefficient of the aluminum alloy that is the material of the housing 9 is larger than the thermal expansion coefficient of the bearing steel that is the material of the outer ring 13. Therefore, the radial interval between the fitting portion inner peripheral surface 9a of the housing and the outer ring 13 increases as the temperature rises. At this time, the creep preventing member 16 is elastically restored by the spread interval. Therefore, even if the temperature rises, the elastic force acting in the radial direction can be maintained and the fitting state of the outer ring 13 with respect to the housing 9 can be maintained.

  FIG. 2 shows a second embodiment of the present invention. In the creep-preventing rolling bearing of the present invention, as in the first embodiment, the outer ring of the rolling bearing fitted and fixed inside the housing made of aluminum alloy and having a cylindrical inner peripheral surface rotates with respect to the housing. This prevents the occurrence of so-called creep.

  The creep preventing rolling bearing 21 of the present invention is provided between an outer ring 23 having an outer ring raceway on an inner peripheral surface, an inner ring 2 having an inner ring raceway on an outer peripheral surface, and the outer ring raceway and the inner ring raceway. A plurality of rolling elements 4 and a cage 5 that holds the rolling elements 4 are provided. Unlike the first embodiment, a rubber creep preventing member 26 is integrally formed with the outer ring 23 by vulcanization molding on the outer peripheral surface of the outer ring 23 so as to have a width equivalent to the axial width of the outer ring 23. Since the material of the creep preventing member 26 is the same as that of the first embodiment, the description thereof is omitted.

  The anti-creep rolling bearing 21 has the inner ring 2 fitted to the fitting portion outer peripheral surface 8a of the rotary shaft 8 so as to be integrally rotatable, and the outer ring 23 is provided in the aluminum alloy housing 9 via a creep preventing member 26. The rotary shaft 8 is rotatably supported by fitting to the fitting portion inner peripheral surface 9a. At this time, the creep preventing member 26 is pressed by the fitting portion inner peripheral surface 9a of the housing and the outer ring 23, and elastic force is generated in the radial direction, so that the housing 9 and the outer ring 23 can be fixed by the frictional engagement force.

  Since the effect when the temperature rises is the same as that of the first embodiment, the description thereof is omitted.

  The creep-preventing rolling bearing of the present invention can be used in a rotation support portion of various mechanical devices, and in particular, a rolling bearing used in a rotation support portion of various auxiliary equipments for automobiles such as an alternator and a compressor for a car air conditioner. Can be suitably used.

1, 11, 21 Anti-Creep Rolling Bearing 2 Inner Ring 3, 13, 23 Outer Ring 4 Rolling Element 5 Cage 6, 16, 26 Creep Prevention Member 7 Circumferential Groove 8 Rotating Shaft 8a Rotating Shaft Fitting Outer Surface 9 Housing 9a Housing Inner peripheral surface of the fitting part

Claims (1)

An outer ring having an outer ring raceway on the inner peripheral surface;
An inner ring having an inner ring raceway on the outer peripheral surface;
A plurality of rolling elements provided between the outer ring raceway and the inner ring raceway so as to roll freely;
In the anti-creep rolling bearing provided with the cage for holding the rolling element and the anti-creep member,
The creep prevention member is made of rubber, is molded integrally with the outer peripheral surface of the outer ring, and further has an axial width at least equal to or greater than the width of the outer ring. bearing.

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