JP5463687B2 - Rolling bearing - Google Patents

Description

  The present invention relates to a rolling bearing provided with a separator between rolling elements.

Conventionally, in rolling bearings used in environments where it is difficult to use grease, such as in a vacuum or high temperature environment, a separator disposed between rolling elements is formed of a self-lubricating composite material containing a solid lubricant. is there.
In the above-described conventional rolling bearing, the separator is a member formed in a prismatic shape or a cylindrical shape, and a plurality of rolling elements interposed between the inner and outer rings are movably interposed between adjacent rolling elements. Has been placed. In addition, the separator is movably surrounded by inner and outer rings and a shield plate that seals between the inner and outer rings (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2005-3178

When the inner and outer rings rotate relative to each other, the separator of the rolling bearing may come into contact with any member such as a rolling element, inner and outer rings surrounding the separator, and a shield plate. . In particular, since the adjacent rolling elements are in sliding contact with both end surfaces in the circumferential direction of the separator, the separator is moved to the outer ring side on one end surface in the circumferential direction of the separator, and the separator is moved to the inner ring side on the other end surface. A force to try, that is, a force to rotate the separator acts. For this reason, the separator is greatly inclined in the rotation direction, and the outer peripheral edge of one end surface in the circumferential direction may simultaneously contact the outer ring and the inner peripheral edge of the other end surface may simultaneously contact the inner ring. In this case, a large shearing force acts on the separator, which may cause damage to the separator or abnormal wear.
As described above, in the conventional rolling bearing separator, there is a case where the inner ring and the outer ring are unstable due to an inclination or the like, and if this causes simultaneous contact with the inner and outer rings rotating relative to each other, Damage or abnormal wear occurs, and the durability as a rolling bearing is reduced.
Furthermore, if the separator is in an unstable state between the inner and outer rings, the separator may be damaged or abnormally worn as described above. Therefore, the allowable rotational speed of the rolling bearing needs to be kept low.
This invention is made | formed in view of such a situation, and it aims at providing the rolling bearing which can raise an allowable rotational speed, suppressing the fall of durability.

To achieve the above object, the present invention provides an inner raceway in which an inner ring raceway is formed, and an outer raceway that is arranged concentrically on the radially outer side of the inner raceway and in which an outer ring raceway is formed. A plurality of rolling elements interposed between the inner ring raceway surface and the outer ring raceway surface so as to freely roll, and a self-lubricating composite material disposed between the rolling elements adjacent to each other among the plurality of rolling elements. In a rolling bearing comprising a plurality of separators, one of the inner race and the outer race has an opposing circumferential surface facing a circumferential surface on the race surface side of the one race. In addition, a guide member is provided that guides the rotation of each separator by sandwiching the plurality of separators in a slidable manner between the opposing peripheral surface and the peripheral surface on the raceway side of the one raceway. And the guide member has a rail of the one raceway ring. It provided axially opposite end portions of the circumferential surface of the surface side, the inner bearing ring and consists of a shield plate which closes the annular opening of both axial ends of the outer race ring, sliding the axial ends of the plurality of separators The surface facing the raceway surface side of the one raceway in each separator is formed in a shape along the cross-sectional shape of the raceway surface of the one raceway, and each separator is A convex curved portion for guiding the raceway along the raceway surface is formed.

  According to the rolling bearing configured as described above, the rotation of each separator (the rolling bearing of the rolling bearing) is performed by the opposing peripheral surface that slidably holds a plurality of separators with the peripheral surface on the raceway surface side of one bearing ring. Since the guide member for guiding the revolution about the axis center is provided on one of the race rings, each separator can be prevented from being largely inclined in the rotation direction. As a result, each separator can be prevented from coming into contact with the other race ring that rotates relative to the one race ring, and the separator can be held in a stable state between the inner and outer rings. Therefore, breakage of the separator and occurrence of abnormal wear can be prevented, deterioration of the durability of the rolling bearing can be suppressed, and the allowable rotation speed can be increased.

Moreover, since the guide member clamps both axial ends of the plurality of separators, it is possible to prevent the separators from being inclined in the axial direction. As a result, the separator can be held in a more stable state between the inner and outer rings.

  According to the rolling bearing of the present invention, it is possible to increase the allowable rotational speed while suppressing a decrease in durability.

1 is a partially cutaway perspective view showing a configuration of a rolling bearing according to an embodiment of the present invention. It is sectional drawing of the rolling bearing in FIG. It is sectional drawing which shows the rolling bearing which concerns on other embodiment.

Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a partially cutaway perspective view showing a rolling bearing according to an embodiment of the present invention.
In FIG. 1, a rolling bearing 1 includes an inner race ring (hereinafter also referred to as an inner ring) 2, an outer race ring (hereinafter also referred to as an outer ring) 3 disposed concentrically on the radially outer side of the inner ring 2, and an inner and outer ring 2. , 3, a plurality of balls 4 as a plurality of rolling elements, a plurality of separators 5 disposed between adjacent balls 4 among the plurality of balls 4, and an inner circumference of the outer ring 3 A pair of shield plates 6 that are fixed to both ends of the surface and close the annular openings at both ends of the inner and outer rings 2 and 3 are provided.

The inner ring 2 is an annular member formed using martensitic stainless steel such as SUS440, for example, and an inner ring raceway surface 2a on which a plurality of balls 4 roll is formed on the outer peripheral surface.
Similarly to the inner ring 2, the outer ring 3 is an annular member formed using martensitic stainless steel, and an outer ring raceway surface 3a on which a plurality of balls 4 roll is formed on the inner peripheral surface. A pair of shield plates 6 are fitted into and fixed to the both ends in the axial direction of the inner peripheral surface of the outer ring 3 to form seal grooves 3b.

  The plurality of balls 4 are members formed using martensitic stainless steel such as SUS440, for example, and are interposed between the raceway surfaces 2a and 3a formed on the inner and outer rings 2 and 3 so as to roll freely. Yes.

The separator 5 is a member formed in a substantially square shape using a self-lubricating composite material, and is disposed between the balls 4 adjacent to each other in the circumferential direction in the annular space between the inner and outer rings 2 and 3 as described above. ing.
The self-lubricating composite material used for the separator 5 is a material obtained by adding tungsten disulfide having a function as a solid lubricant to a metal or resin as a binder, and is a solid lubricant added. Each part of the rolling bearing 1 is lubricated by tungsten disulfide.
As the solid lubricant added to the self-lubricating composite material, in addition to the above tungsten disulfide, layered materials such as molybdenum disulfide and graphite, soft metals such as gold, silver, lead, tin, and indium, PTFE, A synthetic resin such as polyimide can be used.

  The shield plate 6 is an annular member that closes the annular openings at both ends of the inner and outer rings 2 and 3, and an attachment portion 6 a formed by curling is formed on the outer peripheral edge. The inner peripheral edge of the shield plate 6 is bent inward in the axial direction and extended to a position close to the outer peripheral surface of the inner ring 2. The shield plate 6 is provided so as to be integrally rotatable with the outer ring 3 by fitting and fixing the mounting portion 6 a into the seal groove 3 b of the outer ring 3.

FIG. 2 is a cross-sectional view of the rolling bearing in FIG. Referring to FIGS. 2 and 1, the shield plate 6 includes a first side plate portion 6b that extends inward in the circumferential direction from the attachment portion 6a, and a cylindrical portion 6c that extends inward in the axial direction from the tip edge of the first side plate portion 6b. The cylindrical portion 6 c has a second side plate portion 6 d that extends radially inward from the axially inner end portion and has a tip edge that is close to the outer peripheral surface 2 b of the inner ring 2.
The inner side surface 6b1 of the first side plate portion 6b is formed so as to be slidable with a slight gap with respect to both end surfaces in the axial direction of the separator 5, and restricts movement of the separator 5 in the axial direction. ing.

Further, the cylindrical portions 6c of the pair of shield plates 6 extend inward in the axial direction from the front end edge of the first side plate portion 6b, thereby contacting and slidingly contacting both axial end portions of the radially inner side surface 5a of the separator 5. It is provided as follows.
The cylindrical surface 6c1 on the outer peripheral side of the cylindrical portion 6c constitutes an opposing peripheral surface facing the inner peripheral surface 3c (the peripheral surface on the raceway side of one of the raceways) of the outer ring 3 on the outer ring raceway surface 3a side.
The cylindrical portion 6c is dimensioned so that the interval between the cylindrical surface 6c1 and the inner peripheral surface 3c, which is the peripheral surface of the outer ring 3 on the outer ring raceway surface 3a side, can be clamped so that the separators 5 are not significantly inclined in the rotation direction. It is formed to become. For this reason, the radial outer surface 5b of the separator 5 and the inner peripheral surface 3c of the outer ring 3 can also slide in the circumferential direction and the axial direction. In addition, the said autorotation direction here is a direction shown by the arrow G in FIG. 1, and is a rotation direction around the passage line T1 which passes the separator 5 to an axial direction.

Thus, the separator 5 is disposed between the inner peripheral surface 3c of the outer ring 3 and the cylindrical surface 6c1 of the cylindrical portion 6c of the shield plate 6 facing the inner peripheral surface 3c. The radial position is regulated by the inner peripheral surface 3 c of the outer ring 3 and the cylindrical surface 6 c 1 of the shield plate 6. Therefore, the separator 5 is movable along the circumferential direction while sliding between the inner peripheral surface 3 c of the outer ring 3 and the cylindrical surface 6 c 1 of the shield plate 6.
That is, the pair of shield plates 6 sandwich the plurality of separators 5 between the inner peripheral surface 3c of the outer ring 3 and the cylindrical surface 6c1 of the shield plate 6 so that the separators 5 can rotate. A guide member for guiding the rotation of each separator 5 is configured so as not to tilt.

In addition, the axial distance between the axially inner front ends of the cylindrical portions 6 c of each of the pair of shield plates 6 is set to be smaller than the axial length of the separator 5. This prevents the separator 5 from dropping inward in the radial direction from between the axially inner front ends of the cylindrical portion 6c.
Further, the separator 5 is separated by a first side plate portion 6b formed with a slight gap with respect to both end surfaces in the axial direction of the separator 5 and balls 4 adjacent to both end surfaces in the circumferential direction of the separator 5. 5 is restricted from rotating around the passing line T2 (see FIG. 1) passing through the rolling bearing 1 in the radial direction.

  According to the rolling bearing 1 configured as described above, the shield plate that guides the rotation of each separator 5 by the cylindrical surface 6c1 that slidably contacts the plurality of separators 5 with the inner peripheral surface 3c of the outer ring 3. Since 6 is provided in the outer ring | wheel 3, it can prevent that each separator 5 inclines largely in the autorotation direction. As a result, each separator 5 can be prevented from contacting the inner ring 2 that rotates relative to the outer ring 3, and the separator 5 can be held in a stable state between the inner and outer rings 2 and 3. Therefore, breakage of the separator 5 and occurrence of abnormal wear can be prevented, and the decrease in durability of the rolling bearing 1 can be suppressed, and the allowable rotational speed can be increased.

  Moreover, in the said embodiment, since the shield plate 6 is provided in the axial direction both ends of the outer ring | wheel 3, and the axial direction both ends of the some separator 5 are clamped so that sliding contact is possible, the said separator 5 is axially supported. It can prevent that the inclination to a direction arises. As a result, the separator 5 can be held in a more stable state between the inner and outer rings 2 and 3.

  Further, in the rolling bearing 1 of the present embodiment, the case where the separator 5 is formed in a substantially square shape has been shown. For example, as shown in FIG. 3, the radially outer surface that is a surface facing the outer ring 3 side of the separator 5. A convex curved portion 5c along the cross-sectional shape of the outer ring raceway surface 3a of the outer ring 3 can be provided on the outer ring 3 along the circumferential direction. In this case, when the separator 5 moves between the inner and outer rings 2 and 3 along the circumferential direction, the separator 5 is guided along the outer ring raceway surface 3a by the convex curved portion 5c. It is held in a stable state.

  The present invention is not limited to the above embodiments. In the above embodiment, the guide member having the cylindrical surface 6c1 for sandwiching the plurality of separators 5 is exemplified by the shield plate 6. However, the cored bar having a seal lip formed of an elastic body such as rubber is exemplified. The guide member can also be constituted by a seal member that has a slinger that is in sliding contact with the seal lip and closes the annular openings at both ends of the inner and outer rings. In this case, a cylindrical surface for sandwiching the separator so as to be slidable on the metal core or slinger is formed. Moreover, a guide member can also be comprised with the spacer arrange | positioned between a pair of rolling bearings.

  Moreover, in the said embodiment, the case where one bearing ring was made into the outer ring 3, the surrounding surface by the side of the track surface was made into the internal peripheral surface 3c, and the opposing peripheral surface was made into the cylindrical surface 6c1 of the cylindrical part 6c of the shield board 6 was illustrated. However, one of the race rings may be an inner ring, the raceway side peripheral surface thereof may be the outer circumference surface of the inner ring, and the opposed circumferential surface may be the inner circumference side of a guide member attached to the inner ring. In this case, the separator is sandwiched between the outer peripheral surface of the inner ring and the peripheral surface on the inner peripheral side of the guide member so as to be slidable. At this time, it is preferable to attach a guide member to the axial direction both sides of the inner ring. Furthermore, it is preferable that the separator does not fall off radially outward from the guide member.

  Moreover, in the said embodiment, although the case where the separator 5 was each arrange | positioned between adjacent balls 4 was illustrated, the separator 5 is not arrange | positioned between all adjacent balls 4, but arbitrary adjacent balls 4 It is also possible to arrange the separator 5 only between them.

  Moreover, although the case where the rolling bearing 1 was a deep groove ball bearing was illustrated in the said embodiment, this invention is other ball bearings, such as an angular ball bearing, a cylindrical roller bearing, a tapered roller bearing, and a self-aligning roller bearing. It can also be applied to roller bearings such as.

DESCRIPTION OF SYMBOLS 1 Rolling bearing 2 Inner raceway ring 2a Inner ring raceway surface 3 Outer raceway ring 3a Outer raceway raceway surface 4 Ball 5 Separator 6 Shield plate (guide member)
6c1 Cylindrical surface (opposing peripheral surface)

Claims (1)

An inner race with an inner raceway surface formed thereon;
An outer raceway that is disposed concentrically on the radially outer side of the inner raceway and has an outer raceway surface formed thereon;
A plurality of rolling elements movably interposed between the inner ring raceway surface and the outer ring raceway surface;
Among the plurality of rolling elements, a plurality of separators made of a self-lubricating composite material disposed between mutually adjacent rolling elements, and a rolling bearing comprising:
Any one of the inner raceway and the outer raceway has an opposing peripheral surface facing the peripheral surface on the raceway surface side of the one raceway, and the opposing peripheral surface and the one raceway. Between the peripheral surface on the raceway surface side of the ring, the plurality of separators are slidably held, and a guide member for guiding the rotation of each separator is provided,
The guide member is formed of a shield plate that is provided at both ends in the axial direction of the circumferential surface on the raceway surface side of the one raceway ring and closes the annular openings at both axial ends of the inner raceway and the outer raceway. , And sandwich both axial ends of the plurality of separators so as to be slidable,
The surface facing the raceway surface side of the one raceway in each separator has a shape along the cross-sectional shape of the raceway surface of the one raceway, and the separator is placed on the raceway surface of the one raceway. A rolling bearing characterized in that a convex curved portion is formed for guiding along.

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