JP2007278418A - Crown type cage and ball bearing - Google Patents

Abstract

An object of the present invention is to effectively suppress deformation of an elastic piece (claw-like portion) due to high temperature and high speed, and to prevent swinging of a cage during high speed use due to light weight.
A metal plate 4a is insert-molded on at least one of the side surfaces of the cage. That is, the metal plate 4 a is integrally insert-molded on the side surface of the main portion 1 and the side surface of one elastic piece 3 and the adjacent elastic piece 3. Thereby, it is cheap and lightweight, and can suppress deformation at high speed and high temperature. The metal plate 4 a has a circular hole 5 at a central position corresponding to the side surface of the main portion 1 between the pockets 2. A part of the synthetic resin to be insert-molded is infiltrated into the circular hole 5 and solidified, so that the synthetic resin and the metal plate 4a are positioned at this portion, so that the main portion 1 and the metal plate 4a are firmly fixed. Can be bonded to each other and peeling can be prevented.
[Selection] Figure 1

Description

  The present invention relates to a crown-type cage that holds a plurality of rolling elements in a freely rollable manner, and a ball bearing such as a radial ball bearing that includes the crown-type cage and supports rotating parts of various rotary machine devices.

  For example, a cage shown in FIG. 5 is conventionally known as a cage made of a synthetic resin used for a high-speed rotation bearing. FIG. 5 is a partial perspective view of a synthetic resin crown-shaped cage according to a conventional example (Patent Document 1).

  In the conventional example shown in FIG. 5 (Patent Document 1), a plurality of balls 6 are held by a cage 7 so as to be freely rollable. The cage 7 is called a crown type, and is integrally formed by injection molding a synthetic resin. The cage 7 includes an annular main portion 8 made of a synthetic resin and a plurality of sets of pockets 9 and 9 provided on one axial surface (the upper surface in FIG. 5) of the main portion 8. Each of these pockets 9, 9 is composed of a pair of elastic pieces 10, 10 (claw-like portions) that are spaced apart from each other. The mutually opposing surfaces of the pair of elastic pieces 10, 10 constituting each pocket 9, 9 are generally concentric spherical concave surfaces. The balls 6 and 6 are rotatably held in the pockets 9 and 9 by being pushed between the pair of elastic pieces 10 and 10 while elastically expanding the distance between the elastic pieces 10 and 10. Is.

  An annular metal plate 14 is attached to the other axial surface of the main portion 8 (the lower surface in FIG. 5). In this metal plate 14 made of cold rolled carbon steel such as SPCC, circular holes 15 are formed at a plurality of locations in the circumferential direction. Each of these circular holes 15, 15 is a tapered hole whose inner diameter increases with distance from the main portion 8.

  Such a metal plate 14 extends over the entire circumference of the main portion 8 by inserting the metal plate 14 into the mold when the main portion 8 and the elastic pieces 10 and 10 are injection-molded. On the other hand, it is attached non-separated. That is, a part of the synthetic resin constituting the main part 8 and the elastic pieces 10 and 10 is infiltrated into the respective circular holes 15 and 15 to be solidified, thereby firmly connecting the main part 8 and the metal plate 14. Yes.

  As described above, in Patent Document 1, an elastic constant (rigidity) of a metal higher than that of the synthetic resin is used, and the effect thereof is elastic deformation or plastic deformation when the synthetic resin portion is used at high temperature and high speed. It is possible to prevent seizure and damage due to contact with the ring. In addition, an inexpensive and lightweight cage can be realized by using mostly synthetic resin.

  Moreover, in patent document 2, the crown type cage for ball bearings is made by inserting an annular metal element into a synthetic resin. A plurality of recesses are formed on one surface in the axial direction of the annular metal element. A pocket is formed by attaching synthetic resin to the surface of the recess.

Furthermore, in Patent Document 3, a rolling bearing includes a plurality of balls and a metal cage that holds the balls interposed between an inner ring and an outer ring, and at least rolling elements on the surface of the metal cage. A coating resin portion including a polyamide resin is integrally formed on the guide surface.
JP-A-8-145041 Japanese Patent Laid-Open No. 9-79265 JP 2002-323046 A

  However, with further progress in high temperature and high speed, it is required to suppress the deformation of the cage, in particular, the deformation of the elastic piece (claw-like portion) forming the pocket of the crown type cage shown in FIG. ing.

  The present invention has been made in view of the above-described circumstances, and can effectively suppress deformation of the elastic piece (claw-like portion) due to high temperature and high speed, and the elastic piece (claw-like portion). Provided with a crown type cage and ball bearing that can realize a cheaper and lighter cage by insert molding in the vicinity of the side surface, and can also prevent the cage from swinging during high-speed use due to weight reduction. The purpose is to do.

In order to achieve the above object, a crown type retainer according to the present invention includes an annular main portion made of synthetic resin, and a plurality of sets of pockets provided on one axial surface of the main portion,
Each pocket is a crown type cage that is formed integrally with the main part and holds one ball between a pair of elastic pieces that are spaced apart from each other in the circumferential direction. In
A metal plate is insert-molded on at least one of the side surfaces of the crown type cage.

  Preferably, the metal plate is integrally insert-molded on a side surface of at least one elastic piece and the adjacent elastic piece.

Preferably, the metal plate has a hole at a position corresponding to a side surface of the main part between the pockets,
The main portion and the metal plate are firmly bonded to each other by allowing a part of the synthetic resin to be insert-molded into the hole to be solidified.

  In addition, a ball bearing according to the present invention is characterized in that the crown type cage according to any one of claims 1 to 3 is mounted.

  According to the present invention, since the metal plate is insert-molded on at least one of the side surfaces of the crown type cage, it is possible to effectively suppress deformation of the elastic piece (claw-shaped portion) due to high temperature and high speed. In addition, it is possible to realize a cheaper and lighter cage by insert molding only in the vicinity of the side surface portion of the elastic piece (claw-like portion), and it is also possible to prevent swinging of the cage during high speed use due to weight reduction.

  Hereinafter, a crown type cage and a ball bearing according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a partial perspective view of a synthetic resin crown-shaped cage according to a first embodiment of the present invention.

  The cage according to the present embodiment is called a crown type, and is integrally formed by injection molding a synthetic resin. The cage includes an annular main portion 1 made of a synthetic resin and a plurality of sets of pockets 2 and 2 provided on one axial surface (the upper surface in FIG. 1) of the main portion 1. Each of these pockets 2 and 2 is made up of a pair of elastic pieces 3 and 3 (claw-like portions) that are spaced apart from each other.

  The mutually opposing surfaces of the pair of elastic pieces 3, 3 constituting each pocket 2, 2 are generally concentric spherical concave surfaces. Each ball (not shown) is rotatably held in each pocket 2 and 2 by pushing between the elastic pieces 3 and 3 while elastically expanding the distance between the elastic pieces 3 and 3. To do.

  In the present embodiment, the metal plate 4a is insert-molded on at least one of the side surfaces of the cage. That is, the metal plate 4 a is integrally insert-molded on the side surface of the main portion 1 and the side surface of one elastic piece 3 and the adjacent elastic piece 3. Thereby, it is cheap and lightweight, and can suppress deformation at high speed and high temperature.

  The metal plate 4 a has a circular hole 5 at a central position corresponding to the side surface of the main portion 1 between the pockets 2. A part of the synthetic resin to be insert-molded is infiltrated into the circular hole 5 and solidified, so that the synthetic resin and the metal plate 4a are positioned at this portion, so that the main portion 1 and the metal plate 4a are firmly fixed. Can be bonded to each other and peeling can be prevented.

  An elastic piece is formed by insert-molding a metal plate 4a on a side surface of a cage including elastic pieces 3 and 3 (claw-like portions) forming pockets 2 and 2 for holding balls of a synthetic resin crown-type cage. Since the rigidity of 3 and 3 increases, even if the ball moves in the pockets 2 and 2 of the crown-shaped cage and the elastic pieces 3 and 3 try to deform, the deformation of the elastic pieces 3 and 3 can be suppressed to a small extent. it can.

  Therefore, when the ball bearing is a ball guide cage, even if the ball moves in the pockets 2 and 2 of the crown cage and the elastic pieces 3 and 3 are deformed, the deformation of the elastic pieces 3 and 3 is small. It can be suppressed and is effective for a ball bearing using a ball guide retainer used under high temperature and high speed.

  As shown in FIG. 1, when the metal plate 4a is insert-molded only on one side surface of the synthetic resin cage, the other side surface is the surface of the synthetic resin. A ball bearing can also be used as a cage for the inner ring guide or the outer ring guide so as to face the inner surface of the outer ring.

  The material constituting the pair of elastic pieces 3 and 3 forming the main part 1 and the pockets 2 and 2 of the crown-shaped cage made of synthetic resin is nylon 46, nylon 66, polyphenylene sulfide (PPS), polyether ether ketone. A synthetic resin such as (PEEK) can be used.

  Since these materials have a small coefficient of friction and excellent slidability in contact with metal, the influence of rotation restraint of balls (rolling elements) held in the pockets 2 and 2 can be reduced.

  Further, by adding about 10 to 40% by weight of a reinforcing material such as glass fiber (GF) or carbon fiber (CF) to these resins, toughness and mechanical strength at high temperature and high speed can be increased.

  As the metal plate 4a, a carbon steel plate such as a cold rolled steel plate such as SPCC, or a metal plate such as a stainless steel plate, a copper alloy or an aluminum alloy is used, but a carbon steel plate or a stainless steel plate having as large an elastic constant as possible is desirable.

(Second Embodiment)
FIG. 2 is a partial perspective view of a synthetic resin crown-shaped cage according to the second embodiment of the present invention.

  In this Embodiment, it can respond to the case where much bigger deformation stress acts by insert-molding the metal plates 4a and 4b on the both sides | surfaces of the main part 1 made from a synthetic resin.

  In this case, since the metal plates 4a and 4b are insert-molded on both side surfaces of the crown type cage, the inner ring outer diameter surface (inner ring guide) or the outer ring inner diameter surface (outer ring guide) and metal Since the plates 4a and 4b are opposed to each other and the slidability on the respective surfaces is inferior to that of the case where the synthetic resin is opposed, it is desirable to use a ball bearing used in the ball bearing guide cage.

  Other configurations, operations, and effects are the same as those in the above-described embodiment.

(Third embodiment)
FIG. 3 is a partial perspective view of a synthetic resin crown-shaped cage according to a third embodiment of the present invention.

  In the present embodiment, by limiting the metal insert molding site only to the vicinity of the elastic pieces 3 and 3 (nail-like portions), in addition to suppressing deformation, an inexpensive and lightweight cage can be realized.

  That is, the metal plate 4c is integrally insert-molded on the side surface of one elastic piece 3 (claw-like part) and the adjacent elastic piece 3 (claw-like part), and both elastic pieces 3, The portion of the metal plate 4c adjacent to 3 is integrally continuous.

  At this time, as shown in FIG. 3, the metal plate 4c integrated with the adjacent elastic piece 3 (claw-shaped portion) is more effective in suppressing deformation.

  Other configurations, operations, and effects are the same as those in the above-described embodiment.

  FIG. 4A is a diagram illustrating an example of a calculation result of a deformation amount when a crown-shaped cage made of a synthetic resin not reinforcing a metal plate according to a conventional example is rotating at high temperature and high speed, (B) is the calculation result of the deformation | transformation amount regarding the case where the synthetic resin crown type cage which insert-molded the metal plate on the both sides of the main part which concerns on 2nd Embodiment of this invention is rotating at high temperature and high speed. It is a figure which shows an example, (c) is a fragmentary perspective view of the synthetic resin crown type holder | retainer before the deformation | transformation of (b).

Bearings, bearing number 6210 (internal diameter 50 mm, outer diameter 90 mm, width 20 mm) in deep groove ball bearings, the inner ring rotation speed of the bearing is 20,000 min ^-1, the cage rotation speed 8186Min ^-l, retainer temperature 100 ° C. of interest The cage is a ball guide.

  The calculation result is expressed as a relative amount with the deformation amount of the main end face of the synthetic resin cage not reinforcing the metal plate as 1, and the deformation amount of the maximum displacement portion of the elastic piece (claw-shaped portion). Is 28.

  On the other hand, in the cage of the present invention, the deformation amount of the end surface of the main part is 0.3, and the deformation amount of the maximum displacement part of the elastic piece (claw-like part) is 5.8. The plate can be kept extremely smaller than when the insert molding is not performed.

  The present invention is not limited to the above-described embodiments and examples, and can be variously modified.

It is a partial perspective view of the crown type cage made of a synthetic resin according to the first embodiment of the present invention. It is a fragmentary perspective view of the synthetic resin crown type cage according to the second embodiment of the present invention. It is a fragmentary perspective view of the synthetic resin crown type cage concerning a 3rd embodiment of the present invention. (A) is a figure which shows an example of the calculation result of the deformation | transformation amount regarding the case where the synthetic resin crown type cage which is not reinforcing the metal plate which concerns on a prior art example is rotating at high temperature and high speed, (b) ) Is an example of a calculation result of a deformation amount when a synthetic resin crown-shaped cage in which a metal plate is insert-molded on both side surfaces of the main part according to the second embodiment of the present invention is rotating at high temperature and high speed. (C) is a partial perspective view of a synthetic resin crown-shaped cage before deformation of (b). It is a fragmentary perspective view of the synthetic resin crown type cage concerning a conventional example (patent documents 1).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main part 2 Pocket 3 Elastic piece 4a, 4b, 4c Metal plate 5 Circular hole 6 Ball 7 Cage 8 Main part 9 Pocket 10 Elastic piece 14 Metal plate 15 Circular hole

Claims (4)

An annular main portion made of synthetic resin, and a plurality of sets of pockets provided on one axial surface of the main portion,
Each pocket is a crown type cage that is formed integrally with the main part and holds one ball between a pair of elastic pieces that are spaced apart from each other in the circumferential direction. In
A crown-shaped cage, wherein a metal plate is insert-molded on at least one of the side surfaces of the crown-shaped cage.   The crown-type cage according to claim 1, wherein the metal plate is integrally insert-molded on a side surface of at least one elastic piece and the adjacent elastic piece. The metal plate has a hole at a position corresponding to a side surface of the main part between the pockets,
The said main part and the said metal plate are couple | bonded firmly by infiltrating and solidifying a part of synthetic resin to insert-mold in the said hole, The Claim 1 or 2 characterized by the above-mentioned. Crown type cage.   A ball bearing, comprising the crown-type cage according to any one of claims 1 to 3.

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