JP2008240827A - Rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grease lubrication rolling bearing not generating rotation resistance and heat generation, retaining the lubrication state between a guide surface and a retainer to a sufficient degree and capable of suppressing generation of retainer noise. <P>SOLUTION: A rolling body 4 retained in the retainer 5 is interposed between opposed bearing grooves 2a, 3a of an inner ring 2 and an outer ring 3, and the retainer 5 is guided by an inner diameter surface of the outer ring 3. In the grease lubrication rolling bearing 1, a large number of dimple-like grease reservoirs 5b are provided in a manner of distributing over the whole of a portion guided by the outer ring 3 on an outer diameter surface of the retainer 5. In the grease lubrication rolling bearing in which the retainer 5 is guided by the outer diameter surface of the inner ring 2, a large number of dimple-like grease reservoirs are provided in a manner of distributing over the whole of the portion guided by the inner ring 2 on the inner diameter surface of the retainer 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to rolling bearings such as angular ball bearings and deep groove ball bearings used in, for example, main spindles of machine tools rotating at high speeds and winders of textile machines.

In the case of a grease lubricated rolling bearing in which the cage is guided to the inner diameter surface of the outer ring, the contact between the cage outer diameter surface and the outer ring inner diameter surface (guide surface) becomes insufficient during operation, resulting in poor lubrication. is there. If the rotation is continued in this state, heat generation, wear of the cage, and further, the cage noise is generated, which becomes a problem. Patent Documents 1 to 3 propose rolling bearings in which measures for solving such problems are taken.
JP 2001-268655 A JP 2006-329233 A JP 2005-155877 A

  The rolling bearing disclosed in Patent Document 1 uses the inner ring surface of the outer ring or the outer ring surface of the inner ring as the guide surface of the cage, and the axial direction (the direction orthogonal to the rotation direction) extends to the outer diameter surface or the inner surface of the cage. Alternatively, the oil reservoir is formed by providing fine grooves in the circumferential direction (direction parallel to the rotation direction). This rolling bearing is effective for maintaining a good lubrication state during rotation, but the minute groove extending in the axial direction is orthogonal to the relative movement direction of the guide surface, and therefore causes rotational resistance and heat generation during high-speed rotation. It also becomes. Further, in the case of the fine groove in the circumferential direction, directionality more than necessary is given in the relative movement direction of the cage with respect to the outer ring, which also causes rotational resistance and heat generation during high-speed rotation.

  In the rolling bearing disclosed in Patent Document 2, the inner ring surface of the outer ring is used as a guide surface of the cage, and the outer ring surface serving as the guided surface of the cage is provided with an inclined groove that is inclined in the axial direction to generate the cage noise. It is something to suppress. However, in the case of this rolling bearing, the contact with the guide surface of the outer ring is non-uniform due to the inclined groove, and this non-uniform contact of the guide surface is a rotational resistance when used at a high speed rotation such as 10,000 rpm. Cause heat generation.

  Patent Document 3 discloses a rolling bearing in which grease storage grooves are formed on both sides of a raceway groove on the inner surface of the outer ring, and a fine groove is provided on the bottom of the grease storage groove. However, this fine groove increases the grease storage capacity in the grease storage groove, and grease is positively applied to the sliding contact portion between the outer diameter surface of the outer ring guide cage and the inner diameter surface (guide surface) of the outer ring. However, it was not involved in heat generation due to insufficient grease at the contact portion, wear of the cage, and suppression of cage noise generation.

  An object of the present invention is to provide a grease-lubricated rolling bearing that does not cause rotational resistance or heat generation, maintains a good lubrication state between the guide surface and the cage, and can suppress the occurrence of cage noise. It is.

A rolling bearing according to a first aspect of the present invention is a grease lubricated rolling device in which a rolling element held by a cage is interposed between raceway grooves facing an inner ring and an outer ring, and the cage is guided by an inner diameter surface of the outer ring. The bearing is characterized in that an infinite number of dimple-shaped grease reservoirs are provided over the entire portion of the outer diameter surface of the cage guided by the outer ring.
According to this configuration, since the cage is guided to the inner diameter surface of the outer ring, the outer diameter surface of the cage and the inner diameter surface of the outer ring are in sliding contact with each other during rotation. At this time, grease moves to the outer ring side by centrifugal force due to the high-speed rotation of the inner ring, but is distributed over the entire portion of the outer diameter surface of the cage that is guided by the outer ring, and innumerable dimple-shaped grease reservoirs are provided. Therefore, a part of the grease that has moved to the grease reservoir is held in this grease reservoir, and the mutual sliding contact parts are maintained in a good lubricated state by the grease held in this grease reservoir, and cage noise is generated. It can be suppressed. Moreover, since the grease reservoir is made of countless dimples, it does not cause rotational resistance or heat generation even at high speed rotation.

  In the present invention, the rolling element may be a ball, and the cage may be provided with a plurality of pockets for holding the ball arranged in the circumferential direction at an intermediate portion in the cage width direction. According to this configuration, the grease that moves to the outer ring side by centrifugal force is promoted through the plurality of pockets formed in the intermediate part in the cage width direction, and the grease that is guided by the outer ring on the outer diameter surface of the cage It is possible to effectively hold the grease against the dimple-like grease reservoirs distributed throughout.

  In the present invention, grease storage grooves connected to the raceway grooves may be provided on both sides of the raceway groove on the inner diameter surface of the outer ring. According to this configuration, the grease that moves to the outer ring side by the centrifugal force is stored in the grease storage groove via the raceway groove of the outer ring. Since the grease storage groove is connected to the raceway groove, the base oil is supplied again to the raceway groove from the grease stored in the grease storage groove and is repeatedly used as lubricating oil. At this time, since the grease storage groove is formed on both sides of the raceway groove, the lubrication characteristics are improved as compared with the grease storage groove formed on only one side. Further, since the outer diameter surface of the cage facing the guide surface of the outer ring is located near the grease storage groove, the grease stored in the grease storage groove is supplied to the grease reservoir of the cage as needed, and the mutual A good lubrication state of the sliding contact portion is maintained, and the cage noise generation is more effectively suppressed.

A rolling bearing according to a second aspect of the present invention is a grease-lubricated bearing in which a rolling element held by a cage is interposed between raceway grooves facing an inner ring and an outer ring, and the cage is guided to the outer diameter surface of the inner ring. The rolling bearing is characterized in that an infinite number of dimple-like grease reservoirs are provided over the entire portion of the inner diameter surface of the cage guided by the inner ring.
According to this configuration, since the cage is guided to the outer diameter surface of the inner ring, the inner diameter surface of the cage and the outer diameter surface of the inner ring are in sliding contact with each other during rotation. At this time, since there are innumerable dimple-shaped grease reservoirs distributed over the entire portion of the inner diameter surface of the cage that is guided by the inner ring, some of the grease that has moved to the grease reservoirs is retained in this grease reservoir. The mutual sliding contact portions are maintained in a good lubricating state by the grease held in the grease reservoir, and the generation of the cage noise is suppressed. Moreover, since the grease reservoir is made up of countless dimples as described above, it does not cause rotational resistance or heat generation even during high-speed rotation.

  A rolling bearing according to a first aspect of the present invention is a grease lubricated rolling device in which a rolling element held by a cage is interposed between raceway grooves facing an inner ring and an outer ring, and the cage is guided by an inner diameter surface of the outer ring. Since the bearing is provided with innumerable dimple-like grease reservoirs distributed over the entire portion of the outer diameter surface of the cage guided by the outer ring, a part of the grease used for lubrication is dimple. The outer ring guide surface and the outer diameter surface of the cage are kept in good lubrication by the grease held in the grease reservoir, and the generation of cage noise is suppressed. It is done. Further, since the grease reservoir is made of countless dimples, it does not cause rotational resistance or heat generation even during high-speed rotation.

  In this invention, when the grease storage groove connected to the raceway groove is provided on both sides of the raceway groove on the inner diameter surface of the outer ring, the grease storage performance in the grease storage groove and the retention of the grease by the dimple-shaped grease reservoir Synergistically, the lubrication state of the mutual sliding contact parts is more suitably maintained, and the effect of suppressing the generation of cage noise and the effect of suppressing the generation of rotational resistance and heat during high-speed rotation becomes more remarkable.

  A rolling bearing according to a second aspect of the present invention is a grease-lubricated bearing in which a rolling element held by a cage is interposed between raceway grooves facing an inner ring and an outer ring, and the cage is guided to the outer diameter surface of the inner ring. In the rolling bearing, since there are innumerable dimple-like grease reservoirs distributed over the entire portion of the inner diameter surface of the cage guided by the inner ring, a part of the grease used for lubrication is dimple. The grease is held in a grease reservoir, and the sliding surface between the inner ring guide surface and the inner diameter surface of the cage is maintained in good lubrication by the grease held in the grease reservoir, and the generation of cage noise is suppressed. . Further, since the grease reservoir is made of countless dimples, it does not cause rotational resistance or heat generation even during high-speed rotation.

  An embodiment of a rolling bearing according to the present invention will be described with reference to FIGS. A rolling bearing 1 shown in FIG. 1 is an angular ball bearing, and a plurality of balls 4 which are rolling elements are interposed between raceway grooves 2a and 3a opposed to an inner ring 2 and an outer ring 3, and used for grease lubrication. Is. The balls 4 are held by a cage 5 so as to roll freely at a predetermined interval in the circumferential direction. The track grooves 2a and 3a are formed on the outer diameter surface of the inner ring 2 and the inner diameter surface of the outer ring 3 so that the contact angle with the ball 4 is a predetermined angle.

As shown in FIG. 2, the cage 5 is provided with a plurality of pockets 5 a for holding a plurality of balls 4 arranged in the circumferential direction in the middle portion of the cage width direction. The cage 5 is guided by the inner diameter surface of the outer ring 3, and the outer diameter surface includes a portion guided by the outer ring 3 and is distributed over the entire number of dimple-like grease reservoirs 5 b. Is formed. The portions of the inner diameter surface of the outer ring 3 that guides the cage 5 that serve as the cage guide surface 6 are provided on both sides of the raceway groove 3a.
The dimple-shaped grease reservoir 5b is, for example, a spherical concave portion, an elliptic rotating surface, a conical surface, a truncated cone, a truncated cone, a truncated cone, or a polygonal opening edge and a spherical inner surface. The thing of various shapes, such as a thing, is employable. The dimple-shaped grease reservoir 5b can be easily formed by shot blasting or the like, and the size, depth, or distribution of the dimple shape can be optimally set according to the properties of the grease.

  On the outer diameter surface of the inner ring 2, a counter bore 7 whose outer diameter gradually becomes smaller outward is provided on one side of the raceway groove 2 a, that is, on the side opposite to the direction in which the contact angle occurs. The inner surface of the outer ring 3 is cylindrical, and no counterbore is formed. At the time of assembling the bearing, the angular ball bearing 1 can be assembled by heating the outer ring 3 on which the ball 4 is assembled and inserting the inner ring 2 from the counter bore 7 side. Therefore, there is no problem in assembling even if the outer bore 3 is not provided with a counter bore.

  The illustrated angular ball bearing 1 includes seals 8 and 8 at both ends thereof. This seal 8 is a non-contact seal, and its outer peripheral portion is fitted in a seal mounting groove provided on the inner diameter surface of the outer ring 3. As described above, when the seals 8 and 8 are provided at both ends of the angular ball bearing 1, scattering of grease to the outside of the bearing can be suppressed, and durability can be further improved. When a plurality of angular ball bearings 1 are used in an adjacent combination, even if the seal 8 on the mating surface side is omitted, the same effect as that provided on both sides can be obtained.

  As shown in FIG. 1, the grease is sealed in the angular ball bearing 1 assembled with the cage 5 as described above between the counter bore 7 and the cage 5 on the outer diameter surface of the inner ring 2. The encapsulated grease g flows to the inner diameter surface side of the outer ring 3 through a gap between the cage 5 and the ball 4 in the pocket 5a, and a part of the outer diameter surface of the cage 5 and the cage guide surface of the outer ring 3 Infiltrate into the gap between the two. The grease g that has entered the gap is held in the dimple-like grease reservoir 5b. Therefore, when the outer ring surface of the retainer 5 and the retainer guide surface 6 of the outer ring 3 come into sliding contact with each other as the inner ring 2 rotates, the grease g that has been infiltrated and retained exerts a lubricating action, resulting in a good lubrication state. It is maintained and the generation of cage noise is suppressed. Further, since the grease reservoir 5b is made of an infinite number of dimples, it does not cause rotation resistance or heat generation even at high speed rotation. Furthermore, since the cage guide surfaces 6 and 6 are provided on both sides of the raceway groove 3a on the inner diameter surface of the outer ring 3, the behavior of the cage 5 is stabilized, and the temperature rise due to the behavior of the cage 5 is suppressed.

  An angular ball bearing 1A shown in FIG. 3 includes grease storage grooves 9 and 9 connected to the raceway groove 3a on both sides of the raceway groove 3a on the inner diameter surface of the outer ring 3. These grease storage grooves 9 and 9 are provided so that a contact surface between the raceway groove 3a and the ball 4 is secured, that is, a contact ellipse is secured. The grease storage grooves 9, 9 are formed so as to be continuous with the entire circumference of the inner diameter surface of the outer ring 3 and to be connected to the raceway groove 3a over the entire circumference. The guide surfaces 6 and 6 are formed in portions along the grease storage grooves 9 and 9 on both sides. In this case, the guide surfaces 6 are not necessarily provided on both sides, and may be provided only on one side of the raceway groove 3a. Thereby, the width | variety of one grease storage groove | channel 9 can be expanded. Other configurations are the same as those of the angular ball bearing 1 shown in FIG.

  In this embodiment as well, grease g is sealed between the counter bore 7 and the cage 5 on the outer diameter surface of the inner ring 2 as described above. In this case, the raceway of the outer ring 3 is placed on the inner diameter surface of the outer ring 3. Since grease storage grooves 9 and 9 connected to the raceway groove 3a are formed on both sides of the raceway groove 3a so that a contact surface between the groove 3a and the ball 4 is secured, a part of the enclosed grease g is The grease is stored in the grease storage grooves 9 and 9. The grease g stored in the grease storage grooves 9 and 9 is supplied to the gap between the outer diameter surface of the cage 5 and the cage guide surface 6 of the outer ring 3 at any time, and is always held in the dimple-shaped grease reservoir 5b. The Therefore, the durability of the good lubrication state of the mutual sliding contact portion between the outer diameter surface of the cage 5 and the cage guide surface 6 of the outer ring 3 is improved, and the cage noise generation is more effectively suppressed. As described above, when the grease storage grooves 9 and 9 are formed on both sides of the raceway groove 3a, the vertical shaft can be moved up and down even when the pair of angular ball bearings 1A is used in the back or front direction. In the angular ball bearing 1A, any one of the grease storage grooves 9 and 9 is positioned above the raceway groove 3a in the direction of gravity, so that the lubricating oil can be stably supplied to the rolling part. The durability of the bearing 1A is improved.

  An angular ball bearing 1B shown in FIG. 4 is a type that does not have the seals 8 at both ends of the angular ball bearing 1A shown in FIG. The other structure is the same as that of the angular ball bearing 1A of FIG. When the angular ball bearing 1B of this embodiment is used in combination with the angular ball bearing 1 of FIG. 1 or the angular ball bearing 1A of FIG. it can. Also in the angular ball bearing 1B of this embodiment, the sliding contact portion between the outer diameter surface of the cage 5 and the cage guide surface 6 of the outer ring 3 is excellent due to the grease reservoir grooves 9, 9 and the dimple-like grease reservoir 5b. The long-lasting lubrication state is exhibited as well.

  FIG. 5 shows an example of a grease lubricated rolling bearing in which the cage is guided to the outer diameter surface of the inner ring. The rolling bearing 1 </ b> C of this embodiment is a deep groove ball bearing, and a plurality of balls 4 held via pockets 5 a of the cage 5 are interposed between raceway grooves 2 a and 3 a facing the inner ring 2 and the outer ring 3. is doing. The portions that become the cage guide surface 10 on the outer diameter surface of the inner ring 2 that guides the cage 5 are provided on both sides of the raceway groove 2a. An infinite number of dimple-like grease reservoirs 5c are provided over the entire portion of the inner diameter surface of the cage 5 guided by the inner ring 2.

  In the case of the deep groove ball bearing 1 </ b> C of this embodiment, the grease g is sealed between the inner diameter surface of the outer ring 3 and the outer diameter surface of the cage 5. The encapsulated grease g reaches the outer diameter surface side of the inner ring 2 through the pocket 5a of the cage 5 and the like, and permeates into the gap between the inner diameter surface of the cage 5 and the outer diameter surface of the inner ring 2. The grease g that has penetrated into the gap is held in an infinite number of dimple-like grease reservoirs 5 c formed on the inner diameter surface of the cage 5. Therefore, when the inner diameter surface of the cage 5 and the cage guide surface 10 of the inner ring 2 come into sliding contact with each other as the inner ring 2 rotates, the grease g that has been infiltrated and retained exhibits a lubricating action and maintains a good lubrication state. And the generation of cage noise is suppressed. Further, since the grease reservoir 5c is made of an infinite number of dimples, it does not cause rotational resistance or heat generation even during high-speed rotation. Furthermore, since the cage guide surfaces 10 and 10 are provided on both sides of the raceway groove 2a on the outer diameter surface of the inner ring 3, the behavior of the cage 5 is stabilized, and the temperature rise due to the behavior of the cage 5 is suppressed.

  In this embodiment, a grease storage groove (not shown) may be formed on both sides of the raceway groove 2a on the outer diameter surface of the inner ring 3, and the cage guide surfaces 10, 10 may be formed along the grease storage groove. Thereby, the sustainability of the good lubrication state of the mutual sliding contact portion between the inner diameter surface of the cage 5 and the cage guide surface 10 of the inner ring 3 is further improved. Also in the case of the deep groove ball bearing 1C of this embodiment, seals (not shown) may be provided at both ends thereof.

  In the above embodiment, an example in which the rolling bearing is an angular ball bearing or a deep groove ball bearing has been described. However, a roller bearing may be used. Further, the present invention can be applied not only to a single row but also to a double row rolling bearing.

It is sectional drawing which shows one Embodiment of the rolling bearing concerning 1st invention. It is the expanded view of the principal part which looked at the retainer used for the rolling bearing from the outer diameter surface side. It is sectional drawing which shows another embodiment of the rolling bearing. It is sectional drawing which shows another embodiment of the rolling bearing. It is sectional drawing which shows one Embodiment of the rolling bearing concerning 2nd invention.

Explanation of symbols

1, 1A, 1B, ... Angular contact ball bearings (rolling bearings)
1C ... Deep groove ball bearing (rolling bearing)
2 ... Inner ring 2a ... Track groove 3 ... Outer ring 3a ... Track groove 4 ... Ball (rolling element)
5 ... Cage 5a ... Pocket 5b ... Dimple-like grease reservoir 5c ... Dimple-like grease reservoir 6 ... Cage guide surface 9 ... Grease storage groove 10 ... Cage guide surface g ... Grease

Claims (4)

In a grease lubricated rolling bearing in which a rolling element held by a cage is interposed between the raceway grooves facing the inner ring and the outer ring, and the cage is guided to the inner diameter surface of the outer ring,
A rolling bearing comprising an infinite number of dimple-shaped grease reservoirs distributed over the entire portion of the outer diameter surface of the cage guided by the outer ring.   The rolling bearing according to claim 1, wherein the rolling element is a ball, and the cage is provided with a plurality of pockets for holding the ball arranged in a circumferential direction at an intermediate portion in a cage width direction.   The rolling bearing according to claim 1 or 2, wherein a grease storage groove connected to the raceway groove is provided on both sides of the raceway groove on the inner diameter surface of the outer ring. In a grease lubricated rolling bearing in which a rolling element held by a cage is interposed between the raceway grooves facing the inner ring and the outer ring, and the cage is guided to the outer diameter surface of the inner ring,
A rolling bearing comprising an infinite number of dimple-shaped grease reservoirs distributed over the entire portion of the inner diameter surface of the cage guided by the inner ring.

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