JP2007040421A - Cage for rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control the generation of cage noise and to prevent the shortening of a service life caused by seizure by improving a lubricating property in a bearing. <P>SOLUTION: This resin cage 4 is composed of a pair of synthetic resin circular bodies 10, 10 axially connected with each other. Each of the synthetic resin circular bodies 10 has a plurality of approximately hemispherical pocket portions 11 receiving balls 3 of rolling elements in axially connecting the circular bodies, and sufficiently permitting its rolling, and a plurality of flat portions 12 disposed between the adjacent approximately hemispherical pocket portions 11, 11. The flat portions 12, 12 of the pair of synthetic resin circular bodies 10, 10 are fixed to one another by welding (thermal welding or ultrasonic welding). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rolling bearing retainer used for constituting a rotation support portion of, for example, an air conditioner, a fan, a motor, or a cleaner motor.

  Rolling bearings used for home appliance motors such as air conditioner fan motors are required not only in the initial stage but also for long-term quietness.

  Therefore, conventionally, the rolling bearing cage used in these devices is often a resin cage by injection molding using 66 nylon or the like having excellent wear resistance as its material.

  However, due to production problems, dimensional errors are not always eliminated, so the cage pocket size loses the gap between the rolling element balls and the cage pockets and hinders the rotation of the rolling element balls. In order to avoid this, the manufacturing error was set in advance, and it was set large for the ball of the rolling element.

  In addition, since the resin cage used for these has a crown-shaped asymmetric shape, when the resin cage is vibrated by external vibration, its behavior is not stable, and in some cases In some cases, an abnormal noise called a cage sound occurred.

In addition, the crown-shaped resin cage is larger in volume than the corrugated metal cage due to its structure, and as a result, the space volume in the rolling bearing is reduced, so the amount of grease charged in the rolling bearing is reduced. Therefore, the structure is not always optimal from the viewpoint of lubrication.
JP 2004-76778 A JP 2003-343571 A JP-A-4-236820 Japanese Utility Model Publication No. 6-1848

  Further, in the resin cages disclosed in Patent Document 1, Patent Document 2, and Patent Document 4, hemispherical pockets are formed on one side surface of two synthetic resin annular bodies at equal intervals in the circumferential direction, and adjacent to each other. An engagement hole and an engagement claw are formed in a joint portion between the pockets to be formed so that the two annular bodies have the same shape and can be molded with one type of forming mold.

  However, in the resin cages of these patent documents, if the strength is increased, the volume of the resin cage is large, so that the space volume in the rolling bearing is reduced, and the amount of grease enclosed in the rolling bearing is reduced. From the viewpoint of lubrication, the structure was not optimal.

  In addition, in the resin cages of these patent documents, when trying to increase the dimensional accuracy, the above-mentioned claw-shaped engagement claw has a complicated mold shape and a complicated manufacturing process. There is.

  The present invention has been made in view of the circumstances as described above, and can suppress the generation of cage noise and prevent the deterioration of the life due to seizure by improving the lubricity in the bearing. An object of the present invention is to provide a cage for a rolling bearing.

In order to achieve the above object, a rolling bearing cage according to the present invention is a rolling bearing cage in which a pair of synthetic resin annular bodies are axially coupled to each other to constitute a resin cage.
Each synthetic resin ring is
A plurality of substantially hemispherical pocket portions that, when combined with each other, accommodate the rolling elements and sufficiently allow the rolling;
A plurality of plane portions provided between adjacent substantially hemispherical pocket portions,
The planar portions of the pair of synthetic resin annular bodies are fixed to each other by welding.

Further, the rolling bearing cage according to the present invention is a rolling bearing cage in which a pair of synthetic resin annular bodies are axially coupled to each other to constitute a resin cage.
Each synthetic resin ring is
A plurality of substantially hemispherical pocket portions that, when combined with each other, accommodate the rolling elements and sufficiently allow the rolling;
A plurality of plane portions provided between adjacent substantially hemispherical pocket portions,
A thin plate member made of metal is insert-molded on the flat portion of each synthetic resin annular body, and the flat portions are fixed to each other by rivets.

  According to the present invention, it is possible to prevent a decrease in life due to seizure by suppressing generation of cage noise and improving lubricity in the bearing.

  Hereinafter, a rolling bearing retainer according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a sectional view of a rolling bearing equipped with a rolling bearing cage according to an embodiment of the present invention.

  FIG. 2A is a perspective view of one synthetic resin annular body of the rolling bearing retainer according to the embodiment of the present invention, and FIG. 2B is a view in which a pair of synthetic resin annular bodies are combined. It is a perspective view of the state of a vessel.

  As shown in FIG. 1, in a rolling bearing, balls 3 as rolling elements are interposed between an outer ring 1 and an inner ring 2 so as to freely roll. These balls 3 are rolled by a resin cage 4. It is guided while maintaining a predetermined interval while being sufficiently allowed to move.

  As shown in FIGS. 2 (a) and 2 (b), the resin cage 4 is composed of a pair of synthetic resin annular bodies 10 and 10 which are axially coupled to each other.

  Each of the synthetic resin annular bodies 10 includes a plurality of substantially hemispherical pocket portions 11 that house the balls 3 of the rolling elements and sufficiently allow the rolling when adjoining each other in the axial direction, and adjacent substantially hemispherical parts. And a plurality of flat surface portions 12 provided between the pocket portions 11 and 11. In addition, the substantially hemispherical pocket part 11 is formed with a slightly larger radial dimension than the radius of the balls 3 of the rolling elements.

  In the present embodiment, the flat portions 12 and 12 of the pair of synthetic resin annular bodies 10 and 10 are fixed to each other by welding.

  That is, the flat portions 12 and 12 join the pair of synthetic resin annular bodies 10 and 10 by welding (thermal welding or ultrasonic welding).

  In addition, as a welding method, similarly to the conventional rivet caulking, a cylindrical pin is provided on the flat surface portion of one synthetic resin annular body 10, and the flat surface portion 11 of the other synthetic resin annular body 10 is provided. By providing a hole into which this pin enters, after positioning both, you may fix by welding the front-end | tip of this pin.

  As described above, according to the present embodiment, the shape of the cage 4 is symmetrical in the axial direction as in the conventional waveform cage, thereby preventing vibration due to the unbalance of the cage 4. As a result, the cage noise can be reduced.

  In addition, by using a non-metallic material for the contact surface with the balls 3 of the rolling elements, wear of the cage 4 is prevented, generation of cage noise is suppressed, and lubricity in the bearing is improved. Therefore, it is possible to prevent a decrease in life due to seizure.

  Furthermore, by making the cage shape into a corrugated shape, it is possible to prevent deformation and breakage due to the centrifugal force of the column part, which is a problem in the crown type cage, and to improve the allowable rotational speed of the bearing.

  In addition, as a material of a contact part with the rolling element 3 used for the holder | retainer 4 of this Embodiment, thermoplastic resins, such as polyamide (nylon), polyacetal (POM), and polyphenylene sulfide (PPS) resin, are mentioned.

  FIG. 3A is a perspective view of one synthetic resin annular body of a rolling bearing retainer according to another embodiment of the present invention, and FIG. 3B is the synthetic resin product shown in FIG. It is a perspective view of an annular body.

  In the present embodiment, a thin plate member 13 made of metal is insert-molded in the flat portion 11 of each synthetic resin annular body 10, and both the flat portions 11, 11 are inserted through the holes 14 with rivets, They are fixed together by caulking rivets.

  Therefore, in this embodiment, the pair of synthetic resin annular bodies 10 and 10 can be fixed more firmly than in the case of welding in the above-described embodiment.

  In the case of this embodiment, in addition to the above-described thermoplastic resin, rubber materials such as acrylic rubber, nitrile rubber, and fluorine rubber, thermosetting resins such as phenol resin, polyimide, PTFE, and the like can also be used.

  Also in the present embodiment, the shape of the cage 4 is symmetrical in the axial direction as in the conventional waveform cage, thereby preventing vibration due to the unbalance of the cage 4, As a result, the cage sound can be reduced. In addition, by using a non-metallic material for the contact surface with the balls 3 of the rolling elements, wear of the cage 4 is prevented, generation of cage noise is suppressed, and lubricity in the bearing is improved. Therefore, it is possible to prevent a decrease in life due to seizure. Furthermore, by making the cage shape into a corrugated shape, it is possible to prevent deformation and breakage due to the centrifugal force of the column part, which is a problem in the crown type cage, and to improve the allowable rotational speed of the bearing.

  In addition, this invention is not limited to embodiment mentioned above, A various deformation | transformation is possible.

1 is a cross-sectional view of a rolling bearing equipped with a rolling bearing retainer according to an embodiment of the present invention. (A) is a perspective view of one synthetic resin annular body of the rolling bearing cage according to the embodiment of the present invention, and (b) is a diagram of a cage in which a pair of synthetic resin annular bodies are combined. It is a perspective view of a state. (A) is a perspective view of one synthetic resin annular body of a rolling bearing retainer according to another embodiment of the present invention, and (b) is a synthetic resin annular body shown in (a). FIG.

Explanation of symbols

1 outer ring 2 inner ring 3 rolling element (ball)
DESCRIPTION OF SYMBOLS 4 Resin cage 10 Synthetic resin annular body 11 Almost hemispherical pocket part 12 Plane part 13 Metal thin plate-like member 14 Hole

Claims (2)

In a rolling bearing cage in which a pair of synthetic resin annular bodies are axially coupled to each other to form a resin cage,
Each synthetic resin ring is
A plurality of substantially hemispherical pocket portions that, when combined with each other, accommodate the rolling elements and sufficiently allow the rolling;
A plurality of plane portions provided between adjacent substantially hemispherical pocket portions,
A cage for a rolling bearing, characterized in that the flat portions of the pair of synthetic resin annular bodies are fixed to each other by welding. In a rolling bearing cage in which a pair of synthetic resin annular bodies are axially coupled to each other to form a resin cage,
Each synthetic resin ring is
A plurality of substantially hemispherical pocket portions that, when combined with each other, accommodate the rolling elements and sufficiently allow the rolling;
A plurality of plane portions provided between adjacent substantially hemispherical pocket portions,
A rolling bearing retainer characterized in that a metal thin plate-like member is insert-molded in a flat portion of each synthetic resin annular body, and the flat portions are fixed to each other by rivets.

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