JP2008169855A - Rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing capable of keeping the roundness of bearing rings constant without influence of caulking force acting when caulking and securing seal plates. <P>SOLUTION: The rolling bearing includes the bearing rings (an inner ring 2 and an outer ring 4) arranged face to face so as to be relatively rotatable, a plurality of rolling bodies 6 rollably assembled between the bearing rings, and the annular seal plates 10 for sealing the interior of the bearing defined between the bearing rings from the exterior of the bearing. Each seal plate has a base end 10e secured to an annular groove (seal groove 4g) formed in one of the bearing rings and a top end positioned in a non-contact state with respect to the other of the bearing rings. The base end of the seal plate has notches 10k formed by cutting off a part of the base end and arranged at three portions in the circumferential direction at regular intervals. The seal plate is secured to the annular groove of one of the bearing rings by caulking parts 10p lying between the notches at the three portions of the base end and attaching the parts 10p to the annular groove. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rolling bearing provided with a sealing plate for sealing the inside of the bearing from the outside of the bearing, and more particularly to a technique for mounting the sealing plate.

  Conventionally, various rolling bearings to which a sealing plate is attached are known. As an example, the rolling bearing shown in FIG. 2 (a) includes a plurality of rolling bearings that are rotatably mounted between the bearing rings (inner ring 2 and outer ring 4) opposed to each other so as to be relatively rotatable and the inner and outer rings 2 and 4. Rolling elements 6, a cage 8 that holds each rolling element 6, and an annular sealing plate 10 that seals the inside of the bearing defined between the inner ring 2 and the outer ring 4 from the outside of the bearing. Here, for example, a roller or a ball can be applied as the rolling element 6, but the ball 6 is shown as an example in the drawing.

  The inner ring 2 is formed with a raceway groove 2s (hereinafter referred to as an inner ring raceway groove 2s) continuous in the circumferential direction along the outer peripheral surface thereof, while the outer ring 4 is opposed to the inner ring raceway groove 2s. Thus, a raceway groove 4s (hereinafter referred to as an outer ring raceway groove 4s) that is continuous in the circumferential direction is formed. In this case, a plurality of rolling elements (balls) 6 incorporated between the inner and outer rings 2 and 4 while being held by the cage 8 roll along the inner ring raceway groove 2s and the outer ring raceway groove 4s. Thus, the inner ring 2 and the outer ring 4 can be smoothly rotated relative to each other.

  The sealing plate 10 is disposed between the inner and outer rings 2 and 4 on both sides (bearing both sides) of each rolling element (ball) 6, and an annular shield 10 is applied as an example in the drawing. Here, the shield 10 is formed by, for example, pressing a metal plate in an annular shape, and its base end 10e is fixed to one race ring (for example, the outer ring 4), and its tip 10t is the other race ring ( That is, it is positioned in a non-contact state with respect to the inner ring 2). In this case, the outer ring 4 is formed with an annular seal groove (annular groove) 4g continuous along the circumferential direction on both sides of the inner circumference, and the base end 10e is caulked and attached to the seal groove 10g. Thus, the shield 10 can be fixed to the outer ring 4.

  By the way, the seal groove 4g is formed by performing a turning process on both inner peripheral sides of the outer ring 4 and then subjecting the outer ring 4 to a heat treatment at a predetermined temperature. In this case, depending on the temperature at the time of heat treatment, as shown in FIG. 2B, the outer ring 4 may be thermally deformed into an ellipse (two angles), but at this time, the seal groove formed in the outer ring 4 Similarly, 4g is also deformed. When the shield 10 is caulked and fixed in the seal groove 4g in such a state, the outer ring 4 may be deformed and the roundness may be lost depending on the magnitude of the caulking force. As a result, the dimensional accuracy of the outer diameter of the outer ring 4 cannot be kept constant, and as a result, it becomes difficult to smoothly fit the outer ring 4 into, for example, a housing (not shown).

  Further, in the deformed outer ring 4, the dimensional accuracy of the outer ring raceway groove 4s cannot be kept constant. Therefore, when the outer ring 4 is forcibly fitted into the housing, the outer ring raceway groove 4s is rotated during bearing rotation. Each rolling element (ball) 6 that rolls along the axis vibrates, so that the rolling element (ball) 6 collides with the cage 8 to generate, for example, cage noise. If it becomes so, it will become impossible to respond | correspond to the apparatus for which low vibration and low noise are calculated | required, for example, As a result, the use range as a rolling bearing will be limited.

  Therefore, in order to prevent the roundness of the outer ring 4 from collapsing, for example, in Patent Document 1, as shown in FIG. 2 (c), a large number of notches 10k are formed along the circumferential direction of the base end 10e. A shield 10 has been proposed. In this case, the number of notches 10k is set to nZ ± X (n: positive integer, Z: number of rolling elements, X: integer of 2 or more).

However, most of the shape of the seal groove 4g of the outer ring 4 deformed by the heat treatment is an ellipse (two corners) (FIG. 2B). For this reason, even if the number of notches 10k is increased, the sealing groove 4g is stretched in the direction of the minor axis α by the caulking force when the shield 10 is caulked and fixed to the outer ring 4, and as a result, the outer ring 4 The diameter is deformed into an ellipse, and the roundness of the outer ring 3 is lost (FIG. 2 (c)).
JP-A-11-62999

  The present invention has been made to solve such a problem, and its purpose is to keep the roundness of the raceway ring constant without being affected by the caulking force when caulking and fixing the sealing plate. An object of the present invention is to provide a rolling bearing that can be used.

  In order to achieve this object, the present invention provides a bearing ring that is disposed so as to be relatively rotatable, a plurality of rolling elements that are rotatably incorporated between the bearing rings, and a bearing interior defined between the bearing rings. And an annular sealing plate that seals the bearing from the outside of the bearing, and the sealing plate is fixed to an annular groove formed in one of the bearing rings, and the distal end of the sealing plate is not in contact with the other bearing ring. The rolling bearing is positioned, and at the base end of the sealing plate, three cutout portions formed by cutting out a part thereof are provided at equal intervals along the circumferential direction. In this case, the sealing plate is fixed to the annular groove of the one bearing ring by caulking a portion extending between the three notches of the base end and attaching the portion to the annular groove. .

  According to the rolling bearing of the present invention, the roundness of the bearing ring can be kept constant without being affected by the caulking force when the sealing plate is caulked and fixed.

Hereinafter, a rolling bearing according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Since the present embodiment is an improvement of the above-described rolling bearing (FIG. 2 (a)), only the improved portion will be described below. In this case, with respect to the same configuration as the rolling bearing shown in FIG. 2 (a), the same reference numerals as those used in the configuration are attached to the drawings used in the present embodiment to explain the configuration. Is omitted.

  FIG. 1 shows a rolling bearing according to the present embodiment. In the rolling bearing, a notch 10 k formed by cutting out a part of the base end 10 e of the sealing plate (shield 10) surrounds the rolling bearing. Three places are provided at equal intervals along the direction. In this case, the shield 10 is attached to the annular groove (seal groove 4g) by caulking a portion 10p extending between the three notches 10k in the base end 10e, thereby sealing the outer ring 4 It is fixed to the groove 4g.

  As described above, according to the present embodiment, for example, even when the base end 10e of the shield 10 is caulked and fixed to the seal groove 4g of the outer ring 4 deformed into an oval (bilateral) shape as shown in FIG. The caulking force that acts on the seal groove 4g from the base end 10e in which the notches 10k are formed at three locations acts in a radial direction (radial direction) obtained by dividing the seal groove 4g into three equal parts in the circumferential direction. In this case, the outer diameter of the outer ring 4 is not deformed into an elliptical shape as shown in FIG. 2C, for example, regardless of the position of the elliptical (diagonal) sealing groove 4g. For example, as shown in FIG. 1, the outer ring 4 bulges evenly in the radial direction divided into three equal parts in the circumferential direction.

  Thereby, after caulking, the outer diameter of the outer ring 4 is maintained at a substantially constant roundness without the roundness of the outer ring 4 being greatly collapsed. As a result, since the dimensional accuracy of the outer diameter of the outer ring 4 can be kept constant, the outer ring 4 can be smoothly fitted into, for example, a housing (not shown). In addition, since the dimensional accuracy of the outer ring raceway groove 4s of the outer ring 4 can be kept constant, the generation of cage noise can be prevented. In this case, for example, it is possible to cope with a device that requires low vibration and low noise, and as a result, the range of use as a rolling bearing can be expanded.

  In the above-described embodiment, the case where the base end 10e of the sealing plate (shield 10) is fixed to the seal groove 4g of the outer ring 4 has been described, but instead, for example, a seal is provided on the outer periphery of the inner ring 2 Even in a bearing configuration in which a groove is formed and the base end of the sealing plate (shield) is caulked and fixed thereto, by forming three notches similar to the above embodiment on the base end, An effect can be obtained.

  In the above-described embodiment, the size and shape of the notch 10k are not particularly mentioned, but the size is arbitrarily set according to the size of the shield 10 (base end 10e), for example. There is no particular limitation here. Moreover, about the shape, although the triangular-shaped notch part 10k was shown as an example on drawing, various shapes, such as a rectangular shape and an ellipse shape, are applicable besides this, for example. In short, no matter what shape of the cutout portion 10k is applied, the cutout portion 10k is provided in the base end 10e of the shield 10 at three equal intervals along the circumferential direction, so that the same as in the above-described embodiment. An effect can be obtained.

The figure which shows the structure of the sealing board of the rolling bearing which concerns on one embodiment of this invention. (a) is a cross-sectional view showing a partially enlarged configuration of a current rolling bearing, (b) is a diagram schematically showing the state of an outer ring and a seal groove deformed by heat treatment, and (c) is a number of drawings. The figure which shows typically the state of roundness collapse of an outer ring | wheel at the time of crimping and fixing the conventional shield which has a notch part.

Explanation of symbols

2 Inner ring 4 Outer ring 4g Seal groove 6 Rolling element 10 Sealing plate 10e Base end 10p of sealing plate Part extending between notches

Claims (2)

A bearing ring disposed so as to be relatively rotatable, a plurality of rolling elements that are rotatably incorporated between the bearing rings, and an annular sealing plate that seals the inside of the bearing partitioned between the bearing rings from the outside of the bearing. The sealing plate is a rolling bearing whose base end is fixed to an annular groove formed in one of the race rings, and whose tip is positioned in a non-contact state with respect to the other race ring,
A rolling bearing characterized in that, at the base end of the sealing plate, three cutout portions formed by cutting out a part thereof are provided at equal intervals along the circumferential direction.   The sealing plate is fixed to the annular groove of the one of the race rings by caulking a portion extending between the three notches of the base end and attaching it to the annular groove. The rolling bearing according to claim 1.

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