JP2009121560A - Shield plate fixing method and rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for fixing a shield plate capable of maintaining the roundness of a race ring constant after the shield plate is fixed, by reducing a caulking force applied to the shield plate and eliminating a deformation amount of the race ring in caulking. <P>SOLUTION: In this shield plate fixing method, metallic shield plates 12a, 12b are caulked and fixed to seal grooves (outer ring seal grooves Gs) formed on race rings (outer ring 4, inner ring 6) relatively rotatably incorporated in a bearing (ball bearing 2) by a caulking die 14 of a predetermined caulking tool T. The shield plate is caulked and fixed to the seal grooves by applying a caulking force to the shield plate from the caulking tool while swinging one of the caulking tool and the race rings relative to the axis Ax of the race ring at a predetermined swing angle &alpha;. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to an improvement in a method for fixing a shield plate to various rolling bearings such as a miniature bearing and a small diameter bearing.

  Conventionally, a bearing is provided with various sealing plates for sealing the inside of the bearing from the outside of the bearing. As an example, in the sealed deep groove ball bearing disclosed in Patent Document 1, a notch extending toward the outer peripheral end of the curled portion of the shield plate that is caulked and attached (fixed) to the outer ring that is the raceway ring ( It is formed in the number of balls + 2) or more. This suppresses the deformation amount of the outer ring when the shield plate is attached (caulking), and maintains and improves the roundness of the outer ring after the shield plate is attached (fixed).

By the way, in the bearings as described above, the rounding force of the outer ring after fixing the shield plate is further improved by reducing the caulking force applied to the shield plate and eliminating the deformation amount of the outer ring during caulking. Therefore, there is a demand for improvement and maintenance. In particular, in a miniature bearing or a small diameter bearing having a bearing inner diameter of 10 mm or less, if the caulking force applied to the shield plate is large, it may be difficult to maintain and improve the roundness of the outer ring after the shield plate is fixed. .
JP 2003-314575 A

  The present invention has been made in order to meet the above-described demands, and its purpose is to reduce the caulking force applied to the shield plate and eliminate the amount of deformation of the raceway during caulking, thereby shielding the shield plate. An object of the present invention is to provide a shield plate fixing method capable of maintaining the roundness of a raceway ring constant after fixing.

In order to achieve such an object, the present invention is configured by caulking a metal shield plate with a predetermined caulking jig with respect to a seal groove formed in a bearing ring that is incorporated in a bearing so as to be relatively rotatable. A shield plate fixing method for fixing, wherein one of the caulking jig and the bearing ring is swung from the caulking jig to the shield plate while being swung at a predetermined swing angle with respect to the axis of the bearing ring. By applying force, the shield plate is caulked and fixed in the seal groove (step of claim 1). In this case, the shield plate is caulked and fixed in the seal groove while the caulking jig and the race are relatively rotated around the axis center of the race (step of claim 2). In addition, after the process of claim 1 or claim 2, when the shield plate is caulked in the seal groove, a pressing force is applied to the shield plate in a state where the swing angle coincides with the axial center of the race. Thus, the shield plate is pressed against the seal groove.
Further, the present invention is a rolling bearing in which a shield plate is caulked and fixed in a seal groove by the shield plate fixing method as described above, and a bearing ring disposed so as to be relatively rotatable and a rolling ring between the bearing rings. The shield plate is fixed by caulking in a seal groove formed on at least one of the opposed surfaces of the raceway ring.

  According to the present invention, by reducing the caulking force applied to the shield plate and eliminating the deformation amount of the race ring during caulking, the roundness of the race ring can be maintained constant after the shield plate is fixed. Can be realized.

  Hereinafter, a shield plate fixing method according to an embodiment of the present invention will be described with reference to the accompanying drawings. Here, as the rolling bearing applied to the shield plate fixing method, for example, various bearings such as a ball bearing using a `` ball '' as a rolling element and a roller bearing using a `` roller '' can be assumed. FIG. 1A shows a ball bearing 2 as an example of a rolling bearing.

  As shown in FIG. 1 (a), the ball bearings 2 are formed on raceways (outer ring 4, inner ring 6) opposed to each other so as to be relatively rotatable, and facing surfaces 4s, 6s of the outer inner rings 4, 6, respectively. A plurality of rolling elements (balls) 8 that are rotatably incorporated between the raceway grooves (between the outer ring raceway groove 4g and the inner ring raceway groove 6g), and holding each of the rolling elements (balls) 8 rotatably. In order to seal the inside of the bearing from the outside of the bearing, there are provided sealing plates 12a and 12b fixed on both sides between the outer and inner rings 4 and 6, respectively. The retainer 10 shown in the drawings is an example, and various types such as a corrugated retainer, a crown retainer, and a combined retainer can be applied.

  Further, as the sealing plates 12a and 12b, a seal made of rubber with a core and maintained in contact with the races (the outer ring 4 and the inner ring 6), a seal maintained in a non-contact state, or A shield plate made of metal and maintained in contact with the races (outer ring 4, inner ring 6) can be assumed. FIG. 1A shows a metal plate as an example of a sealing plate. Shown are the shield plates 12a, 12b made.

  In this case, the shield plates 12a and 12b are caulked and fixed in seal grooves formed on at least one of the facing surfaces 4s and 6s of the race rings (the outer ring 4 and the inner ring 6) (that is, either or both). Can do. As an example, FIG. 1A shows a seal groove Gs (hereinafter referred to as an outer ring seal groove Gs) continuously formed along the circumferential direction on both sides of the opposing surface 4s of the outer ring 4. The shield plates 12a and 12b are caulked and fixed in the outer ring seal groove Gs. The facing surface 4s of the outer ring 4 refers to the outer ring inner peripheral surface 4s facing the inner ring 6 (an inner ring outer peripheral surface 6s described later), and the facing surface 6s of the inner ring 6 refers to the outer ring 4 (that is, the outer ring inner peripheral surface). 4s) refers to the inner ring outer circumferential surface 6s.

  In the shield plate fixing method of the present embodiment, as shown in FIG. 1A, a predetermined crimping jig T can be applied, and the shield plates 12a and 12b are attached by the crimping jig T. The outer ring seal groove Gs can be fixed by crimping. In the drawing, one (lower in the figure) shield plate 12b is fixed by crimping the outer ring seal groove Gs, and the other (upward in the figure) shield plate 12a. Is set in the caulking jig T, and the state when the other shield plate 12a is caulked and fixed to the outer ring seal groove Gs of the ball bearing 2 (outer ring 4) by the caulking jig T is shown. Yes.

  As the caulking jig T, for example, as shown in FIG. 2, a caulking die 14 having an annular pressing piece 14t for applying caulking force to the shield plates 12a and 12b, and the caulking die 14 are caulked. An attachment jig 16 for attaching to the tool T is provided. Each of the shield plates 12a and 12b is provided with a curl portion P1 formed by curving (folding) its outer diameter portion toward one side (for example, the outer side) along the circumferential direction. In addition, a bent portion P2 formed by bending the inner diameter portion in the substantially vertical direction toward the other side (for example, the inner side) is provided along the circumferential direction.

  In this case, for example, as shown in FIG. 1A, in the state where the ball bearing 2 and the shield plate 12a are set on the crimping jig T, the pressing piece 14t of the crimping die 14 is set to the outer diameter portion of the shield plate 12a. When the curl part P1 is pressed in the direction of the arrow F while being applied to the curled part P1 formed, the shield plate 12a can be fixed to the outer ring seal groove Gs by partially crimping the curl part P1 into the outer ring seal groove Gs. . At this time, the shield plate 12a is positioned in a non-contact state with respect to the inner ring 6 (inner ring outer peripheral surface 6s), similarly to the shield plate 12b on one side (downward in the drawing).

  In this state, a slight gap (labyrinth) is formed between the bent portion P2 of the shield plates 12a and 12b and the inner ring 6 (inner ring outer peripheral surface 6s). As a result, the inside of the bearing can be kept sealed from the outside of the bearing. In the drawing, the inner ring outer peripheral surface 6s of the inner ring 6 is formed with a groove 6h in which a portion facing the bent portion P2 of the shield plates 12a and 12b is recessed along the circumferential direction, and the groove 6h and the bent groove 6h are bent. A labyrinth is formed with the part P2. In this case, the size and shape of the concave groove 6h can be arbitrarily set according to the length and shape of the bent portion P2, and are not particularly limited here. Further, the groove 6h is not necessarily required if a labyrinth can be formed between the bent portion P2 and the inner ring outer peripheral surface 6s.

  Here, the size, shape, curvature (curvature radius), etc. of the curled portion P1 of the shield plates 12a, 12b are arbitrary depending on the size, shape, etc. of the outer ring seal groove Gs of the outer ring 4 to which the curled portion P1 is crimped. Set to As an example, the curled portion P1 of the shield plates 12a and 12b shown in FIG. 1 (b) is inclined by extending the outer diameter portion of the curled body 12m having a hollow disk shape toward the inward side. A portion 12k, an upright portion 12t extending from the inclined extending bottom portion 12n of the inclined portion 12k toward the outer side in a substantially vertical direction, and an extending end of the upright portion 12t facing inward And a curved portion 12r which is folded back into a curved shape, and has a curl shape as a whole. In this case, the extension length of the inclined portion 12k, the rising length of the upright portion 12t, the radius of curvature of the curved portion 12r, etc. are set according to the size and shape of the outer ring seal groove Gs, and therefore are limited to numerical values. Do not

  On the other hand, the outer ring seal groove Gs of the outer ring 4 includes, for example, as shown in FIG. 1C, an annular introduction part G1 extending with an inner diameter smaller than the outer diameter of the shield plates 12a and 12b, An annular diameter-enlarged portion G2 having an expanded diameter from the extending end of the introduction portion G1, and an annular contact portion G4 extending from the maximum diameter portion G3 of the expanded-diameter portion G2 toward the outer ring inner peripheral surface 4s. I have. The inner diameter dimension and extension length of the annular introduction portion G1, the diameter expansion amount of the annular expansion portion G2, the size of the annular contact portion G4, and the like are the size and shape of the curled portion P1 of the shield plates 12a and 12b, Since it is set according to the curvature (curvature radius) or the like, there is no particular numerical limitation.

Next, a shield plate fixing method for caulking and fixing the shield plates 12a and 12b to the outer ring 4 of the ball bearing 2 as described above will be described.
First, for example, as shown in FIG. 1A, the ball bearing 2 and the shield plate 12a are set on the crimping jig T. The crimping jig T is configured to be swingable at a predetermined swing angle α with respect to the axial center Ax of the outer ring 4, and the swing center Tc and the axial center Ax of the outer ring 4 coincide with each other. Is set in advance. In this case, the shield plate 12a is set so that the curled portion P1 of the outer diameter portion straddles the annular introduction portion G1 of the outer ring 4 (outer ring seal groove Gs). At this time, the pressing piece 14t of the caulking die 14 is positioned substantially directly above the curved portion 12r of the curled portion P1.

  Thereafter, when the caulking jig T is swung at a predetermined rocking angle α with respect to the axial center Ax of the outer ring 4, the caulking die 14 is similarly swung. Here, when the caulking die 14 is tilted to one side by the swing angle α with respect to the shaft center Ax, the pressing piece 14t on the one side of the caulking die 14 is applied to the curled portion P1 of the shield plate 12a by the tilt amount. Weld locally. Thereby, the caulking force F is locally applied to the curled portion P1 from the pressing piece 14t. From this state, when the caulking die 14 is swung to the other side by the swing angle 2α, the caulking die 14 is tilted to the other side by the swing angle α with respect to the shaft center Ax, so that the amount of the tilt corresponds. The pressing piece 14t on the other side of the crimping die 14 is locally pressed against the curled portion P1 of the shield plate 12a. Thereby, the caulking force F is locally applied to the curled portion P1 from the pressing piece 14t.

  In this way, when the caulking die 14 is swung and the caulking force F is locally applied from the pressing piece 14t to the curled portion P1, the curled portion P1 is, as shown in FIG. Then, it is pushed along the annular introduction part G1 while being reduced in diameter while being elastically deformed. When the curled portion P1 in a reduced diameter gets over (passes through) the annular introduction portion G1, the curled portion P1 is partially expanded by the restoring force due to its own elasticity. The diameter increases toward the maximum diameter portion G3 along G2, and is crimped into the outer ring seal groove Gs.

  In such a caulking step, the swing angle α of the caulking jig T (that is, the caulking die 14) is arbitrarily set according to the type of the ball bearing 2, but the axial center Ax of the outer ring 4 is set. On the other hand, it is preferable to set in the range of 0.5 ° to 1.5 °. In this case, the crimping die 14 is swung a plurality of times, and a crimping force F is applied a plurality of times to the curled portion P1 of the shield plate 12a from the pressing piece 14t, whereby the curled portion P1 is The outer ring seal groove Gs may be caulked in stages, or when the caulking die 14 is swung once, the caulking force applied to the curled portion P1 of the shield plate 12a from the pressing piece 14t. The curled part P1 may be crimped into the outer ring seal groove Gs at once by F.

  At this time, the caulking jig T (caulking die 14) and the outer ring 4 are rotated relative to each other around the axial center Ax of the outer ring 4 to locally move from the pressing piece 14t to the curled portion P1 of the shield plate 12a. The caulking part to which the caulking force F is applied is moved in the circumferential direction along the curled part P1. In this case, as a rotation method, for example, only the caulking jig T (caulking die 14) may be rotated, or only the outer ring 4 may be rotated. Alternatively, the caulking jig T (caulking die 14) and the outer ring 4 may be simultaneously rotated in opposite directions. In addition, since the moving speed and moving amount of the crimping part are arbitrarily set according to the relative rotational speed between the crimping die 14 and the outer ring 4, they are not particularly limited here.

  In this way, by simultaneously rotating the caulking die 14 and the outer ring 4 while swinging the caulking die 14, the caulking force F is locally applied over the entire circumference of the curled portion P1 of the shield plate 12a. Thus, the curled portion P1 is crimped into the outer ring seal groove Gs. Then, at the end of the caulking step, in a state where the rocking angle α coincides with the axis center Ax of the outer ring 4 (that is, the rocking stop state where the rocking angle of the caulking die 14 is 0 °), A pressing force (caulking force F) is applied to the curled portion P1 of the shield plate 12a from the pressing piece 14t. At this time, the inclined extending bottom portion 12n of the curled portion P1 is pressed against the annular contact portion G4 of the seal groove Gs without any gap, so that a part of the curled portion P1 is annularly enlarged diameter portion G2 over the entire circumference. Along the outer diameter of the outer ring seal groove Gs with a uniform force. As a result, the shield plate 12a is fastened and fixed with high accuracy and robustness to the outer ring seal groove Gs.

  Note that the shield plate 12b on one side (downward in the drawing) is already crimped and fixed in the outer ring seal groove Gs, but the shield plate 12b is also similar to the above-described embodiment. In the same manner, the caulking process can be caulked and fixed in the outer ring seal groove Gs, and the description thereof will be omitted.

  As described above, according to the shield plate fixing method of the present embodiment, by applying the caulking force F locally along the curled portion P1 of the shield plate 12a, a large caulking force F is applied at once to the curled portion P1. The shield plate 12a can be caulked and fixed in the outer ring seal groove Gs without adding to the outer ring. In this case, since the caulking stress generated in the curled portion P1 of the shield plate 12a can be locally concentrated, the caulking force F can be reduced to half or less of the current reference caulking force. As a result, it becomes possible to eliminate the deformation amount of the outer ring 4 (outer ring seal groove Gs) during caulking, and as a result, the roundness of the outer diameter of the outer ring 4 is maintained and improved with higher accuracy after the shield plate is fixed. Can be made. In particular, for miniature bearings and small-diameter bearings with an inner diameter of 10 mm or less, the roundness of the outer diameter of the outer ring after fixing the shield plate can be reduced by setting the crimping force applied to the shield plate to less than half of the current standard crimping force. It is possible to maintain and improve dramatically.

  For example, as shown in FIG. 3, the shield plate fixing method according to the present embodiment is within the range of the upper limit level of the machining ability value of the seal groove roundness and the acceptable level of the outer ring outer diameter roundness after completion of caulking. Then, it can be confirmed that the roundness of the outer diameter of the outer ring is maintained and improved to an acceptable level by setting the caulking force to ½ of the current standard caulking force.

  In the caulking step of the above-described embodiment, the caulking end (for example, the criterion for completion of caulking) by the caulking die 14 is the outer ring 4 (for example, the outer ring) of the caulking die 14 (pressing piece 14t). It may be set based on the position with respect to the seal groove Gs), or may be set based on the magnitude of the caulking force F applied to the curled portion P1 of the shield plate 12a.

  In the above-described embodiment, the case where the caulking die 14 and the outer ring 4 are simultaneously rotated relative to each other while the caulking die 14 is swung has been described. The swing direction of T (caulking die 14) may be swung around the swing center Tc. By doing so, the caulking part for applying the caulking force F locally to the curled part P1 of the shield plate 12a from the pressing piece 14t can be moved along the curled part P1 in the circumferential direction. The effect similar to the state which rotated 14 and the outer ring | wheel 4 relatively can be implement | achieved.

  In the above-described embodiment, the integrated caulking die 14 is used. Instead of this, for example, the caulking die is divided into a plurality (at least three or more) along the circumferential direction, and each caulking die is divided. By sequentially moving the clamping molds individually toward the curled portion P1 of the shield plate 12a, the crimping force F is locally applied to the curled portion P1 of the shield plate 12a from the pressing pieces 14t of the respective crimping molds. May be.

  Furthermore, in the above-described embodiment, the case where the caulking jig T is swung at a predetermined rocking angle α with respect to the axial center Ax of the outer ring 4 has been described. If the caulking jig T cannot be swung due to the installation environment or purpose of use, instead of rocking the caulking jig T (caulking die 14), the ball bearing 2 is moved to the center of the outer ring 4. You may make it rock | fluctuate with the said rocking | swiveling angle (alpha) with respect to Ax. Even in this case, similarly to the above-described embodiment, the caulking portion where the caulking force F is locally applied from the caulking die 14 to the curl portion P1 of the shield plate 12a is circumferentially along the curl portion P1. Can be moved to.

  In the above-described embodiment, the case where the shield plates 12a and 12b are caulked and fixed to the outer ring seal groove Gs of the outer ring 4 has been described. However, the present embodiment is also applicable to the case where the shield plate is caulked and fixed to the inner ring 6. The shield plate fixing method of the invention can be applied. In this case, an inner ring seal groove having the same shape as the outer ring seal groove Gs is formed on the inner ring outer peripheral surface 6 s of the inner ring 6. On the other hand, the shield plates 12a and 12b are provided with a curled portion having the same shape as the curled portion P1 at the inner diameter portion thereof, and provided with a bent portion having the same shape as the bent portion P2 at the outer diameter portion thereof. Then, by performing the caulking process in the same manner as in the above embodiment, the shield plates 12a and 12b can be caulked and fixed in the inner ring seal groove with a caulking force that is less than half of the current level. Thereby, it becomes possible to eliminate the deformation amount of the inner ring 6 (outer ring seal groove) during caulking, and as a result, the roundness of the inner diameter of the inner ring 4 can be maintained and improved with high accuracy after the shield plate is fixed. it can.

(a) is sectional drawing which expands partially and shows the state by which the shield board and the rolling bearing are set to the crimping jig applied to the shield board fixing method which concerns on one embodiment of this invention, (b) ) Is a cross-sectional view showing a partially enlarged configuration of the shield plate, and (c) is a cross-sectional view showing a partially enlarged state in which the curled portion of the shield plate is crimped by a crimping jig. Sectional drawing which shows the state by which the shield board was crimped by the rolling bearing with the crimping jig applied to the shield plate fixing method which concerns on one embodiment of this invention. The figure which shows the relationship between a seal groove roundness and the outer ring | wheel outer diameter roundness after completion of caulking.

Explanation of symbols

2 Ball bearing 4 Outer ring 6 Inner ring 12a, 12b Shield plate 14 Clamping type Ax Shaft center Gs Outer ring seal groove T Clamping jig α Swing angle

Claims (4)

A shield plate fixing method of fixing a metal shield plate by caulking with a predetermined caulking jig against a seal groove formed in a bearing ring that is incorporated in a bearing so as to be relatively rotatable,
By applying a caulking force from the caulking jig to the shield plate while swinging one of the caulking jig and the raceway at a predetermined swing angle with respect to the axis center of the raceway, the shield plate A shield plate fixing method characterized by crimping and fixing to a seal groove.   2. The shield plate fixing method according to claim 1, wherein the shield plate is caulked and fixed to the seal groove while the caulking jig and the race are relatively rotated around the axis center of the race.   After crimping the shield plate into the seal groove after the step of claim 1 or claim 2, by applying a pressing force to the shield plate in a state where the swing angle coincides with the axial center of the raceway ring, The shield plate fixing method according to claim 1, wherein the shield plate is pressed against a seal groove. A rolling bearing in which the shield plate is swaged and fixed to the seal groove by the shield plate fixing method according to claim 1,
The bearing ring includes a bearing ring arranged to face the bearing ring and a plurality of rolling elements rotatably incorporated between the bearing rings, and the shield plate is a seal formed on at least one of the facing surfaces of the bearing ring. A rolling bearing characterized by being fixed by caulking in a groove.

Images