JP2012082916A - Cage for rolling bearing and rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cage for a rolling bearing capable of reducing a rotational torque and also suppressing burning of a sliding part, and the rolling bearing.SOLUTION: A first groove 51 extending in an extending direction of a column portion 33 is formed on the end surface on the inner side in a radial direction of the column portion 33 of the cage 5 for retaining a cone roller. The first groove 51 is formed such that the depth becomes gradually shallow as it is close to the end on the side of a large diameter annular portion 30 of the first groove 51 on the large diameter annular portion 30 side in the extending direction of the first groove. The first groove 51 is formed such that the edge 71 on the inner side in the radial direction on the side of the first groove 51 and the bottom of the first groove 51 are connected at the end 72 on the large diameter annular portion 30 side of the first groove 51.

Description

  The present invention relates to a rolling bearing cage and a rolling bearing.

  Conventionally, as a rolling bearing, there is a tapered roller bearing described in JP-A-61-96216 (Patent Document 1).

  The tapered roller bearing includes an outer ring, an inner ring, a plurality of tapered rollers, and a cage. The cage includes a large-diameter annular portion, a small-diameter annular portion, and a plurality of column portions, and the large-diameter annular portion has a larger diameter than the small-diameter annular portion.

  Each said pillar part has connected between the large diameter annular part and the small diameter annular part. The plurality of column portions are located at intervals in the circumferential direction of the large-diameter annular portion. A pocket for accommodating the tapered roller is formed between the two column portions adjacent in the circumferential direction. Each of the column portions has a groove that extends in the extending direction of the column portion and opens in the radial direction. The depth of the groove is substantially constant over the entire range in the extending direction of the groove. The groove has end faces extending in a substantially radial direction of the cage on both sides in the extending direction.

  The above conventional tapered roller bearing has an abnormal phenomenon such as seizure due to oil shortage at the time of high speed rotation of the tapered roller bearing so that oil can be accumulated in the groove by forming a groove in the pillar portion of the cage. We are trying to prevent this.

  However, in the conventional tapered roller bearing, since the cage has end faces extending in the substantially radial direction of the cage on both sides in the extending direction, movement of the oil accumulated in the groove in the extending direction is performed. However, the oil that is blocked by the end face and accumulated in the groove is difficult to be discharged from the groove to the outside and is difficult to be supplied to the sliding portion. In particular, when the amount of lubricant supplied is limited to a small amount in order to reduce the stirring resistance for the purpose of reducing rotational torque, seizure of the sliding portion is likely to occur. There is a problem that it is not possible to sufficiently suppress the seizure of the roller guide surface of the large collar portion of the inner ring.

JP-A-61-96216 (FIG. 1)

  Accordingly, an object of the present invention is to provide a rolling bearing retainer and a rolling bearing that can reduce rotational torque and suppress seizure of a sliding portion.

In order to solve the above problems, the rolling bearing cage of the present invention is
A first annular portion;
A plurality of pillars extending from one end in the axial direction of the first annular part and spaced from each other in the circumferential direction of the first annular part,
The radially inner end surface of the first annular portion of at least one of the pillar portions is open to the radially inner side and includes a first groove extending in the extending direction of the pillar portion. Have
The depth of the first groove is gradually shallower toward the first annular portion side end of the first groove on the first annular portion side in the extending direction of the first groove. ,
The radially inner end surface of the side surface of the first groove is connected to the bottom of the first groove at the end of the first groove on the first annular portion side.

  According to the present invention, since the end surface on the radially inner side of the annular body has the first groove, the lubricant existing around the first groove of the cage is accommodated in the first groove. It becomes easy to be done. In addition, the depth of the first groove continuously decreases on the first annular portion side in the extending direction until it becomes zero as it goes to the first annular portion side in the extending direction. Therefore, the lubricant in the first groove easily moves out of the first groove along the bottom of the first groove. Therefore, the lubricant guided from the inside of the first groove to the outside of the first groove can be efficiently guided to the sliding portion such as the rolling surface of the rolling element. Therefore, the lubricant can be efficiently supplied to the sliding portion, and seizure of the sliding portion can be efficiently suppressed.

  Further, since the lubricant can be efficiently accommodated in the first groove and the lubricant in the first groove can be efficiently supplied to the sliding portion, the amount of the lubricant supplied to the rolling bearing can be reduced. . Therefore, the stirring resistance of the lubricant can be suppressed and the rotational torque can be reduced.

In one embodiment,
The column part is connected to an end of the column part opposite to the first annular part side, and includes a second annular part having a smaller inner diameter than the first annular part,
The end surface on the first annular portion side in the axial direction of the second annular portion has a second groove extending in the circumferential direction of the second annular portion,
The second groove is connected to the first groove.

  According to the embodiment, since the column portion connects the first annular portion and the second annular portion having a smaller diameter than that, the radially inner surface of the column portion and the cage The distance from the central axis increases as going to the first annular portion side in the axial direction. Therefore, since the lubricant in the first groove moves toward the first annular portion in the first groove by the pumping action caused by the centrifugal force of the cage, the lubricant moves out of the first groove. The movement can be made smooth, and the lubricant can be smoothly moved to the inner peripheral surface of the first annular portion. Therefore, the lubricant can be smoothly supplied from the inner peripheral surface of the first annular portion on the large diameter side to the roller guide surface of the inner ring through the large diameter end surface of the tapered roller. Surface seizure can be effectively suppressed.

In one embodiment,
An end of each column part opposite to the first annular part side is connected, and a second annular part having a smaller inner diameter than the first annular part is provided,
The first groove extends in the extending direction from an end surface of the second annular portion on the first annular portion side to a portion overlapping the first annular portion in the radial direction.

  According to the embodiment, since the first groove extends in the extending direction up to a portion overlapping the first annular portion in the radial direction, the inner peripheral surface of the first annular portion via the first groove. The amount of lubricant that reaches Therefore, it becomes easier to supply the lubricant to the end surface of the tapered roller, and seizure of the sliding portion such as the roller guide surface of the inner ring can be further suppressed.

  Moreover, according to the said embodiment, since it has the 2nd groove | channel on the end surface by the side of the 1st annular part of the 2nd annular part and the 2nd groove is connected to the 1st groove, the lubrication which flowed into the 2nd groove The agent can be smoothly moved to the first groove. Therefore, a larger amount of lubricant can be supplied to the sliding portion such as the roller guide surface of the large collar portion of the inner ring, and seizure of the sliding portion can be further suppressed.

The rolling bearing of the present invention is
An outer race member having an inner raceway surface;
An inner race member having an outer raceway surface;
A plurality of rolling elements disposed between the inner raceway surface and the outer circumference raceway surface;
The rolling bearing retainer of the present invention that holds the plurality of rolling elements is provided.

  According to the present invention, since the rolling bearing retainer of the present invention is provided, the lubricant can be smoothly supplied to the sliding portion via the first groove of the rolling bearing retainer. Therefore, the seizure of the sliding portion can be effectively suppressed. In addition, according to the present invention, the supplied lubricant can be smoothly supplied to the sliding portion, so that the amount of lubricant to be supplied can be reduced. Therefore, the stirring resistance of the lubricant of the rolling elements can be reduced, and the rotational torque can be reduced.

  According to the rolling bearing cage of the present invention, since the radially inner end surface of the annular body has the first groove, the lubricant present around the first groove of the cage is It becomes easy to be accommodated in the first groove. In addition, the depth of the first groove continuously decreases on the first annular portion side in the extending direction until it becomes zero as it goes to the first annular portion side in the extending direction. Therefore, the lubricant in the first groove easily moves out of the first groove along the bottom of the first groove. Accordingly, the lubricant guided from the inside of the first groove to the outside of the first groove can be efficiently guided to the sliding portion such as the rolling surface of the rolling element, and the seizure of the sliding portion can be efficiently performed. Can be suppressed.

  Moreover, according to the rolling bearing retainer of the present invention, the lubricant in the first groove can be efficiently supplied to the sliding portion, so that the amount of lubricant supplied to the rolling bearing can be reduced. Therefore, the stirring resistance of the lubricant can be suppressed and the rotational torque can be reduced.

It is sectional drawing of the axial direction of the tapered roller bearing of one Embodiment of this invention. It is a figure which shows the side surface of the said holder | retainer. It is a figure when the periphery of one pillar part of the said holder | retainer is seen from the inner peripheral side of a holder | retainer. It is sectional drawing when a pillar part is cut | disconnected in the plane containing the normal line direction and width direction of the rectangular planar part connected to the edge of a 1st groove | channel in the center of the extension direction of the said pillar part. It is a figure when a part of said cage is seen from the radially outward side.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an axial sectional view of a tapered roller bearing according to an embodiment of the present invention.

  The tapered roller bearing includes an outer ring 1 as an example of an outer race member, an inner ring 2 as an example of an inner race member, a plurality of tapered rollers 3 as a plurality of rolling elements, and an example of a cage for a rolling bearing. And a tapered roller bearing cage (hereinafter simply referred to as a cage) 5.

  The outer ring 1 is fitted and fixed in a housing of an automotive part such as a differential gear housing of an automobile, for example. The outer ring 1 has a conical raceway surface 11 as an example of an inner circumference raceway surface. On the other hand, the inner ring 2 is externally fitted and fixed to a rotating shaft of an automotive part such as a pinion shaft of a differential gear of the automobile. The inner ring 2 has a conical raceway surface 21 as an example of an outer raceway surface.

  The inner ring 2 has a small flange portion 22 and a large flange portion 23, and the small flange portion 22 is located on the small diameter side of the conical raceway surface 21, while the large collar portion 23 is located on the conical raceway surface 21. It is located on the large diameter side. An end surface on the side of the conical raceway surface 21 in the axial direction of the large collar portion 23 constitutes a roller guide surface 27 that guides the tapered roller 3.

  The plurality of tapered rollers 3 are disposed between the conical raceway surface 11 of the outer ring 1 and the conical raceway surface 21 of the inner ring 2 at intervals in the circumferential direction while being held by the cage 5. Yes.

  FIG. 2 is a view showing a side surface of the cage 5.

  The cage 5 is a resin cage and is formed by injection molding. As shown in FIG. 2, the cage 5 includes a large-diameter annular portion 30 as a first annular portion, a small-diameter annular portion 31 as a second annular portion, and a plurality of column portions 33, and includes a large-diameter annular portion. The diameter of the inner peripheral surface of the portion 30 is larger than the diameter of the inner peripheral surface of the small-diameter annular portion 31.

  Each column 33 connects the large-diameter annular portion 30 and the small-diameter annular portion 31. The plurality of column portions 33 are located at intervals in the circumferential direction of the large-diameter annular portion 30. A pocket 37 for accommodating a tapered roller (not shown) is formed between the pillar portions 33 adjacent to each other in the circumferential direction.

  In FIG. 2, reference numeral 35 indicates a stress relaxation part. The stress relaxation portions 35 are provided on both sides in the circumferential direction of the end portions of the column portions 33 on the small diameter annular portion 31 side. The stress relieving part 35 is a concave part, and relieves stress generated in the column part 33 when the tapered roller is accommodated in the pocket 37.

  FIG. 3 is a view of the periphery of one pillar portion 33 of the cage 5 as viewed from the inner peripheral side of the cage 5.

  As shown in FIG. 3, the radially inner end face 50 of the cage 5 has a first groove 51. The first groove 51 is present in a portion including an end face on the radially inner side of each column portion 33. Specifically, the first groove 51 extends in the extending direction of each column portion 33 from the end surface 54 of the small-diameter annular portion 31 on the large-diameter annular portion 30 side to the portion overlapping the large-diameter annular portion 30 in the radial direction. ing. The first groove 51 is open on the inner side in the radial direction. The depth of the first groove 51 continuously decreases on the large diameter annular portion 30 side in the extending direction of the column portion 33 until it becomes zero as it goes to the large diameter annular portion 30 side in the extending direction. ing. The depth of the first groove 51 gradually becomes shallower toward the end 72 of the first groove 51 on the large-diameter annular portion 30 side in the extending direction of the first groove 51 in the extending direction. ing. The inner edge 71 in the radial direction of the side surface of the first groove 51 (high wall portion 60 described later) and the bottom of the first groove 51 are on the large-diameter annular portion 30 side of the first groove 51. Connected at end 72.

  Further, as shown in FIG. 3, the end surface 54 on the large-diameter annular portion 30 side in the axial direction of the small-diameter annular portion 31 has a second groove 57 extending in the circumferential direction of the small-diameter annular portion 31, and The groove 57 is connected to the first groove 51. As shown in FIG. 3, the second groove 57 is closed by the side surface of the first groove 51. Further, the edge 71 on the opening side of the side surface that closes the second groove 57 of the first groove 51 is connected to the rectangular flat portion 59.

  The large-diameter annular portion 30 side of the bottom surface of the first groove 51 includes a flat portion 58, and the flat portion 58 is inclined with respect to the rectangular flat portion 59 at the edge 71 on the opening side of the side surface. It is a surface. The inclination angle is 45 ° or less. The inclination angle is preferably 45 ° or less, but may be an angle of 45 ° or more.

  FIG. 4 shows the normal direction and the width of the rectangular planar portion 59 at the center A in the extending direction of the column portion 33 (see FIG. 3: intermediate between the large-diameter annular portion 30 and the small-diameter annular portion 31). It is sectional drawing when the pillar part 33 is cut | disconnected by the plane containing a direction.

  As shown in FIG. 4, the cut surface in the said plane of the pillar part 33 has a cross-sectional mountain shape. Specifically, it has a plate-like bottom portion 70 having a substantially rectangular cross section and three cross-section rectangular wall portions 60, 61, 62 connected to the bottom portion 70, and each wall portion 60, 61, 62 has a cage. The surfaces facing each other in the circumferential direction 5 extend in the normal direction of the surface from the surface on the front side of the bottom portion 70 in a substantially parallel state. In addition, the wall portions 61 and 62 at the two ends are in the circumferential direction of the cage 5 such that the surface on the opposite side to the central wall portion 60 in the circumferential direction of the cage 5 faces inward in the radial direction of the cage 5. It is a flat surface inclined so as to approach the central wall portion side. The three wall portions 60, 61, 62 are arranged at equal intervals in the normal direction of the side surface of the central wall portion 60 on the one end wall portion 61 side. As shown in FIG. 4, the height of the central wall portion 60 from the bottom portion 70 is higher than the height of the end wall portions 61 and 62 from the bottom portion 70. The first wall 51 is defined by the central wall portion 60, the bottom portion 70, and the wall portion 61 at one end, and the first groove is defined by the central wall portion 60, the bottom portion 70, and the wall portion 61 at the other end. 51 is defined.

  In the cross section of FIG. 4, each column portion 33 has a line-symmetric structure with respect to a perpendicular bisector of the central wall portion 60 that bisects the width of the central wall portion 60. Each of the pillar portions 33 has two first grooves 51, and the two first grooves 51 are symmetrically positioned on both the left and right sides of the central wall portion 60.

  FIG. 5 is a view of a part of the cage 5 as viewed from the outside in the radial direction.

  As shown in FIG. 5, the stress relieving portion 35 is formed by a linear taper-shaped notch so as to taper from the intersection of the column portion 33 and the small-diameter annular portion 31 toward the large-diameter annular portion 30 side. It is configured and has a simple shape such that a part of the pillar 33 is linearly cut.

  According to the cage 5 of the above embodiment, the radially inner end surface of the cage 5 that is an annular body has the first groove 51, so that the periphery of the first groove 51 of the cage 5 The lubricant present in is easily accommodated in the first groove 51. Further, the depth of the first groove 51 is continuously increased until it reaches zero on the large-diameter annular portion 30 side in the extending direction of the column portion 33 toward the large-diameter annular portion 30 side in the extending direction. Since it is small, the lubricant in the first groove 51 easily moves out of the first groove 51 along the bottom of the first groove 51. Therefore, the lubricant guided from the inside of the first groove 51 to the outside of the first groove 51 can be efficiently guided to the sliding portion such as the rolling surface of the tapered roller 3. Therefore, since the lubricant can be efficiently supplied to the sliding portion, seizure of the sliding portion can be efficiently suppressed.

  Further, since the lubricant can be efficiently accommodated in the first groove 51 and the lubricant in the first groove 51 can be efficiently supplied to the sliding portion, the amount of lubricant supplied to the rolling bearing is reduced. Can do. Therefore, the stirring resistance generated when stirring the lubricant can be suppressed, and the rotational torque can be reduced.

  Further, according to the cage 5 of the above embodiment, since the column portion 33 connects the large-diameter annular portion 30 and the small-diameter annular portion 31 having a smaller diameter than the large-diameter annular portion 30, The distance between this surface and the central axis of the cage 5 increases as it goes toward the large-diameter annular portion 30 in the axial direction. Therefore, the lubricant in the first groove 51 moves in the first groove 51 toward the large-diameter annular portion 30 by the pumping action caused by the centrifugal force of the cage 5, so that the first lubricant The movement to the outside of the groove 51 can be made smooth, and the lubricant can be smoothly moved to the inner peripheral surface of the large-diameter annular portion 30. Therefore, the lubricant can be smoothly supplied from the inner peripheral surface of the large-diameter annular portion 30 on the large-diameter side to the roller guide surface 27 of the large collar portion 23 of the inner ring 2 via the large-diameter end surface of the tapered roller 3. Thus, seizure of the roller guide surface 27 of the inner ring 2 can be effectively suppressed.

  Further, according to the cage 5 of the above-described embodiment, the first groove 51 extends in the extending direction of the column portion 33 to the portion overlapping the large-diameter annular portion 30 in the radial direction. It is possible to reach the inner peripheral surface of the large-diameter annular portion 30 more easily. Therefore, it becomes easier to supply the lubricant to the end surface of the tapered roller 3, and seizure of the sliding portion such as the roller guide surface 27 of the large collar portion 23 of the inner ring 2 can be further suppressed.

  Further, according to the cage 5 of the above embodiment, the second groove 57 is connected to the first groove 51 on the end surface of the small diameter annular portion 31 on the large diameter annular portion 30 side. Thus, the lubricant that has flowed into the second groove 57 can be smoothly moved to the first groove 51. Therefore, a larger amount of lubricant can be supplied to the sliding portion such as the roller guide surface 27 of the large collar portion 23 of the inner ring 2, and seizure of the sliding portion can be further suppressed.

  Further, according to the cage 5 of the above embodiment, the inner end surface in the radial direction of the pillar portion 33 has a cross-sectional mountain shape, and each of both end portions in the circumferential direction of the pillar portion 33. Since the first groove 51 exists in the shaft, the lubricant in the bearing is more taken into the first groove 51 by the rotation of the tapered roller 3 than in the case where one concave portion is formed in the central portion of the column portion. It becomes easy. Further, since the height of the central wall portion 60 is higher than the height of the end wall portions 61, 62, the lubricant easily collides with the central wall portion 60, and the bearing interior collided with the central wall portion 60. This lubricant can be taken into the first groove 51 efficiently.

  Further, according to the cage 5 of the above embodiment, since the two first grooves 51 are formed symmetrically on both the left and right sides of the central wall portion 60, the range of the concave portion in the column portion 33 can be increased, The thickness of the pillar 33 can be reduced. Therefore, the heat dissipation of the column part 3 can be improved, and deterioration of the column part 33 can be suppressed. If the column portion is thick, the heat is difficult to escape and the heat dissipation becomes worse.

  In the cage 5 of the above embodiment, in each of the pillar portions 33, the first groove 51 exists symmetrically with respect to the central wall portion 60, but in the present invention, at least one pillar portion is present. In addition, two or more first grooves having the same shape may be formed asymmetrically, and two or more first grooves having different structures may exist in at least one column portion.

  Further, in the cage 5 of the above embodiment, there are two first grooves 51 in each pillar portion 33. However, in this invention, at least one pillar portion has only one first groove. May be. Moreover, in this invention, the pillar part which does not have the 1st groove | channel may exist.

  Further, in the cage 5 of the above-described embodiment, the point where the depth of the first groove 51 becomes zero and the first groove 51 ends is the large-diameter annular portion 30. However, according to the present invention, in at least one first groove, the radially inner edge of the side surface of the first groove and the bottom of the first groove are the ends of the first groove on the first annular portion side. The connecting point, and the point where the depth of at least one first groove becomes zero and the first groove ends may be a pillar part.

  Further, in the cage 5 of the above embodiment, the second groove 57 connected to the first groove 51 is present on the end surface of the small-diameter annular portion 31 on the large-diameter annular portion 30 side. May not exist. Further, the second groove may have any structure as long as it extends in the circumferential direction of the second annular portion and is connected to the first groove at least on one side in the extending direction.

  In the cage 5 of the above embodiment, the three plate-like wall portions 60, 61, 62 have the same thickness. However, in the present invention, the thickness of at least two or more plate-like wall portions is the same. May be different.

  In the cage 5 of the above-described embodiment, the bottom surface of the first groove 51 is inclined toward the large-diameter annular portion 30 side with respect to the rectangular planar portion 59 at the edge 71 on the opening side of the side surface of the first groove 51. The flat part 58 to be formed was formed so that the depth of the first groove 51 gradually became zero.

  However, in the present invention, a curved surface that is inclined with respect to a rectangular flat portion at the opening side edge of the side surface of the first groove is formed on the first annular portion side of the bottom surface of the first groove, or a curved surface May be formed so that the depth of the first groove gradually becomes zero.

  In the cage 5 of the above embodiment, the radially inner end face 59 of the central wall portion 60 is a flat surface. However, in the present invention, the radially inner end surface 59 of the central wall portion 60 is provided. The end surface is not limited to a flat surface but may be a curved surface.

  In addition, the cage 5 of the above embodiment has a configuration in which the two annular portions 30 and 31 are connected by the plurality of column portions 33. However, the cage of the present invention is a crown type cage, A configuration in which only one annular portion exists may be used.

  Further, the cage 5 of the above embodiment is configured to hold the tapered roller 3. However, the cage of the present invention is provided with a rolling element other than the tapered roller such as a cylindrical roller, a convex roller (spherical roller), or a ball. The structure to hold | maintain may be sufficient.

  Further, the tapered roller bearing of the above embodiment is arranged between the housing of the automobile part and the rotating shaft. However, the rolling bearing of the present invention is arranged between the housing of the industrial machine and the rotating shaft. May be. The rolling bearing of the present invention may be used to rotatably support any rotating shaft with respect to the housing.

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 3 Tapered roller 5 Cage 11 Conical raceway surface of outer ring 21 Conical raceway surface of inner ring 30 Large-diameter annular part 31 Small-diameter annular part 33 Column part 51 First groove 57 Second groove 71 Side diameter of first groove Inward edge 72 of the direction The end of the first groove on the large-diameter annular portion side

Claims (4)

A first annular portion;
A plurality of pillars extending from one end in the axial direction of the first annular part and spaced from each other in the circumferential direction of the first annular part,
The radially inner end surface of the first annular portion of at least one of the pillar portions is open to the radially inner side and includes a first groove extending in the extending direction of the pillar portion. Have
The depth of the first groove is gradually shallower toward the first annular portion side end of the first groove on the first annular portion side in the extending direction of the first groove. ,
The rolling, characterized in that the radially inner edge of the side surface of the first groove is connected to the bottom of the first groove at an end of the first groove on the first annular portion side. Bearing cage. The rolling bearing cage according to claim 1,
The column part is connected to an end of the column part opposite to the first annular part side, and includes a second annular part having a smaller inner diameter than the first annular part,
The end surface on the first annular portion side in the axial direction of the second annular portion has a second groove extending in the circumferential direction of the second annular portion,
The cage for a rolling bearing, wherein the second groove is connected to the first groove. The rolling bearing cage according to claim 1,
An end of each column part opposite to the first annular part side is connected, and a second annular part having a smaller inner diameter than the first annular part is provided,
The rolling bearing according to claim 1, wherein the first groove extends in an extending direction from an end surface of the second annular portion on the first annular portion side to a portion overlapping the first annular portion in the radial direction. Retainer. An outer race member having an inner raceway surface;
An inner race member having an outer raceway surface;
A plurality of rolling elements disposed between the inner raceway surface and the outer circumference raceway surface;
A rolling bearing comprising the rolling bearing retainer according to any one of claims 1 to 3, which holds the plurality of rolling elements.

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