JP2005221042A - Rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing improved in speed and service life by using only grease sealed inside a bearing, and realized in maintenance-free. <P>SOLUTION: In the rolling bearing wherein an outer ring 2 is fixed, a new grease supplying means 5 is provided on one side of axial direction opposite to a raceway surface 2a, and a mist recovering and re-supplying means 15 is provided on the other side thereof. The new grease supplying means 5 has a grease reservoir forming part 6 provided to be brought in contact with the outer ring 2 and formed with a grease reservoir 8 inside thereof and a clearance forming piece 7. The clearance forming piece 7 forms a clearance 14 for communicating from the grease reservoir 8 to a part near the raceway surface 2a of the outer ring 2 along the peripheral surface formed in the raceway surface 2a. The clearance 14 is formed with a little gap quantity so that base oil of the grease inside the grease reservoir 8 can be supplied to a part near the raceway surface 2a of the outer ring 2 by the capillary phenomenon of thickener agent. The mist recovering and re-supplying means 15 has a recovering means 16 for recovering the mist generated inside the bearing during operation and an aggregation feeding means 17 for aggregating the mist recovered by the recovering means 16 by using an air flow generated by rotation of an inner ring to form into oil and for feeding the oil to the raceway surfaces 1a and 2a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rolling bearing with a lubrication mechanism for grease lubrication of a machine tool main shaft or the like.

  As a lubrication method for machine tool spindle bearings, grease lubrication that can be used maintenance-free, air-oil lubrication in which lubricating oil is mixed with carrier air and oil is injected into the bearing from the nozzle, jet that injects lubricating oil directly into the bearing There are methods such as lubrication. In recent machine tools, in order to increase machining efficiency, there is a tendency for higher speed, and lubrication of main shaft bearings is also relatively inexpensive and air-oil lubrication that can be speeded up easily is often used. However, this air oil lubrication method has a problem from the viewpoint of cost, noise, energy saving, and resource saving because it requires an air oil supply device as ancillary equipment and requires a large amount of air. There is also a problem of deteriorating the environment due to the scattering of oil. In order to avoid these problems, recently, speeding up by grease lubrication has begun to attract attention, and requests have been increasing.

  Since grease lubrication is performed only with the grease enclosed at the time of bearing assembly, high-speed operation may lead to premature seizure due to deterioration of the grease due to bearing heat generation and oil film breakage on the raceway surface, especially the inner ring. . In particular, it is difficult to guarantee the grease life in a high-speed rotation region where the dn value exceeds 1 million (bearing inner diameter mm × rotational speed rpm).

New proposals have been introduced as a means of extending the life of grease. For example, there is a proposal (Patent Document 1) aiming at high speed and long life by providing a grease reservoir on the outer ring raceway surface. In addition, there is a proposal (Patent Document 2) in which a bearing is properly lubricated and lubricated by a grease replenishing device provided outside the spindle.
Japanese Patent Laid-Open No. 11-108068 Japanese Unexamined Patent Publication No. 2000-113998

  However, the technologies of the above proposed examples are not satisfactory when considering the number of rotations used (> dn value 1.5 million) equivalent to air-oil lubrication and maintenance-free.

  The present invention is intended to solve these problems, and provides a rolling bearing that can achieve high speed, long life, and maintenance-free operation using only the grease enclosed in the bearing. .

  The rolling bearing according to the present invention includes an inner ring, an outer ring, and a plurality of rolling elements interposed between the raceways of the inner and outer rings, wherein the inner ring is a rotating side and the outer ring is a fixed side. One of the axial directions is provided with a new grease supply means for replenishing grease accumulated in the vicinity to the vicinity of the raceway surface, and on the other side, the mist recovery for collecting the mist in the bearing and returning it to the vicinity of the raceway surface as an aggregated state A resupplying means is provided.

  The new grease supply means includes, for example, a grease reservoir forming part provided in contact with the outer ring and forming a grease reservoir therein, and a gap provided in the outer ring and communicating from the grease reservoir to the vicinity of the raceway surface of the outer ring, A gap forming piece formed along the circumferential surface on which the raceway surface is formed, and the gap is supplied with grease base oil to the vicinity of the raceway surface of the outer ring by capillary action of the thickening agent. The gap should be as small as possible.

  The mist recovery and re-supply means is, for example, an oil by collecting the mist generated in the bearing during operation, and aggregating the mist recovered by the recovery means using an air flow generated by rotation of the inner ring. And aggregating and feeding means for feeding to the raceway surface.

  The rolling bearing of this configuration is used by enclosing grease in the entire circumference of a grease reservoir and a gap formed between the grease reservoir forming component and the peripheral surface on which the raceway surface of the outer ring is formed. During bearing operation, the grease in the grease reservoir is supplied by the new grease supply means and the misted grease is reused by the mist recovery and resupply means. Only use it to achieve high speed, long life and maintenance-free.

When the grease reservoir forming part and the gap forming piece are provided, the new grease supply means has the following action. Grease is sealed inside the bearing as an initial lubricant. As a result, the grease reservoir and the rolling element contact portion on the raceway surface of the outer ring are connected by the grease. When the grease is thus connected, the base oil permeates and moves due to the capillary action of the thickener in the grease. For this reason, the base oil consumed as lubricating oil in the rolling element contact portion is continuously supplied from the grease reservoir to the rolling element contact portion through the gap. As a result, the lubrication life of the bearing is determined by the amount of grease in the grease reservoir, and by designing the capacity of the grease reservoir as appropriate, only the grease enclosed in the bearing is used and maintenance-free high speed is achieved. Operation and longer life are achieved. When the gap forming piece is provided facing the inner ring, excessive supply of grease is caused by centrifugal force due to rotation, which may cause a temperature rise, but the gap forming piece is provided facing the outer ring. Then, without being affected by the centrifugal force, the grease base oil is supplied by the capillary action as described above and is lubricated with a slight amount of lubricating oil. Therefore, there is no stirring resistance and the temperature rise is stable.
The gap forming piece does not necessarily have to be provided on the entire circumference, but by providing the gap continuously on the entire circumference, the base oil can be replenished to the outer raceway surface from the entire circumference by the above-mentioned capillary phenomenon, and has excellent lubricity. I can do it. If the grease reservoir is provided continuously over the entire circumference, the supply of base oil supply is excellent.

When the mist collection / resupply means includes the collection means and the aggregating and feeding means, the following action is achieved. When the bearing is operated with grease lubrication, the oil adhering to the raceway surface of the inner and outer rings becomes mist due to contact with the rolling elements and floats in the bearing. The floating mist is collected by the collecting means, and is further agglomerated into oil by the use of the air flow and centrifugal force generated by the rotation of the inner ring by the aggregating and feeding means, and sent back to the raceway surface from the inner ring side. The mist is not used for lubrication as it is, but is reused as lubricating oil through the collection and aggregation processes. Therefore, the life of grease lubrication can be extended. Also, unlike the conventional method of replenishing grease from the outside by rotating the inner ring, the enclosed grease is circulated and lubricated with a small amount of lubricating oil, which causes excessive supply of grease and the cause of temperature rise due to stirring resistance Therefore, the rotation speed can be increased.
As described above, both the new grease supply means and the mist recovery / resupply means do not cause excessive supply of grease, and can achieve temperature stability by a minute amount of lubrication.

In this invention, the agglomeration feeding means is provided in the vicinity of the raceway surface on the outer diameter surface of the inner ring so that the raceway surface side has a large diameter, and the inner ring outer diameter surface portion following the small diameter side end of the step surface. The inner ring outer diameter surface portion and the stepped surface may have an inner diameter surface and a tip surface opposed to each other through a gap, and may be formed of an aggregated gap forming body provided in a fixed state with respect to the outer ring.
In the case of this configuration, the mist collected by the collecting means and introduced into the gap of the agglomeration feeding means moves while hitting the inner diameter surface of the agglomerated gap forming body, thereby causing each other to agglomerate. The agglomerated mist becomes oily and adheres to the inner diameter surface of the aggregation gap forming body, and travels along the inner diameter surface as a bearing lubricating oil from a gap sandwiched between the step surface of the inner ring and the front end surface of the aggregation gap formation body. It is discharged into the bearing. For this reason, lubrication can be supplied to the inner ring raceway surface.

In the present invention, the collecting means is formed in an annular tapered cross section between a tapered surface formed on the outer diameter surface of the inner ring and having a large diameter on the raceway surface, and the tapered surface facing the outer periphery of the tapered surface. The mist collecting part that forms the mist collecting space and a communication path that is provided in the mist collecting part and communicates from the mist floating space in the bearing to the mist collecting space.
In this configuration, the mist generated in the bearing flows into the mist collection space through the communication path, and the mist in the mist collection space is sucked into the bearing in the mist collection space by the pumping action by the rotation of the inner ring taper surface. Go. For this reason, mist collection | recovery is efficiently performed by simple structure.

In this invention, the agglomeration feeding means is provided in the vicinity of the raceway surface on the outer diameter surface of the inner ring so that the raceway surface side has a large diameter, and the inner ring outer diameter surface portion following the small diameter side end of the step surface. The outer ring surface portion of the inner ring and an agglomerated gap forming body having an inner diameter surface and a front end surface facing the step surface through a gap, and the recovery means is formed on the outer diameter surface of the inner ring. A tapered surface having a large diameter on the side, a mist collecting part that forms an annular, tapered cross-sectional mist collecting space between the tapered surface and the outer periphery of the tapered surface, and the mist collecting part. The mist floating space in the bearing may be a communication path communicating with the mist collection space, and the aggregation gap forming body and the mist collection component may be integrated with each other as an aggregation gap formation / mist recovery component.
The agglomerated gap forming body and the mist collecting part may be separate parts. However, if the agglomerated gap forming / mist collecting parts are integrated with each other, the number of parts can be reduced and the assembling workability can be improved.

In the present invention, either or both of the new grease supply means and the mist recovery / resupply means are provided adjacent to the outer ring in the axial direction, and a part thereof falls within the outer ring width. good.
In particular, when the new grease supply means has the grease reservoir forming part and the mist recovery and resupply means has the recovery means, the grease reservoir forming part and mist in these new grease supply means and Both or any one of the collection means in the collection / resupply means may be provided adjacent to the outer ring in the axial direction so that a part thereof falls within the width of the outer ring.
In this way, by providing the outer ring adjacent in the axial direction, it is possible to secure a wide area for supplying grease by the new grease supplying means and a mist collecting action area by the mist collecting and re-feeding means, and effectively perform these actions. be able to.

In the present invention, the new grease supply means and / or the mist recovery / resupply means may be within the width of the outer ring.
If it fits within the width of the outer ring, it can be handled as an integrated rolling bearing in which new grease supply means and mist recovery / resupply means are assembled, so that the assembly workability of the rolling bearing to equipment is improved.

In the present invention, widening portions for accommodating the new grease supply means and the mist collection / resupply means are provided on both sides of the inner ring and the outer ring, and both the new grease supply means and the mist collection / resupply means are disposed within the width of the outer ring. You may fit in.
When the new grease supply means and the mist recovery / resupply means are both contained within the width of the outer ring in this way, they can be handled as an integrated rolling bearing with these means, and the assembly workability of the rolling bearing to equipment is further improved. To do. In addition, the inner ring and the outer ring are provided with a widened portion for accommodating the new grease supply means and mist collection / resupply means, so that a space for accommodating these new grease supply means and mist collection / resupply means is secured in the bearing. can do.

In the present invention, the rolling bearing may be used for supporting a spindle of a machine tool.
For machine tool spindles, high-speed rotation to improve machining efficiency, prevention of bearing heat generation to ensure machining accuracy, and maintenance-free to improve productivity by shortening operation stop time are strongly desired. Therefore, by using the rolling bearing according to the present invention, the advantage that speeding up, long life, and maintenance-free can be achieved by using only the grease sealed in the bearing according to the present invention is effectively exhibited.

  The rolling bearing according to the present invention includes an inner ring, an outer ring, and a plurality of rolling elements interposed between the raceways of the inner and outer rings, wherein the inner ring is a rotating side and the outer ring is a fixed side. One of the axial directions is provided with a new grease supply means for replenishing grease accumulated in the vicinity to the vicinity of the raceway surface, and on the other side, the mist recovery for collecting the mist in the bearing and returning it to the vicinity of the raceway surface as an aggregated state Since the resupply means is provided, it is possible to achieve high speed, long life, and maintenance-free operation using only the grease sealed in the bearing.

  A first embodiment of the present invention will be described with reference to FIGS. In FIG. 1, this rolling bearing has a plurality of rolling elements 3 interposed between raceways 1a and 2a of an inner ring 1, an outer ring 2, and inner and outer rings 1 and 2; Supplying means 15 is provided. The inner ring 1 is a rotating side wheel, and the outer ring 2 is a fixed side wheel. The plurality of rolling elements 3 are held by the cage 4. This rolling bearing is a grease-filled angular ball bearing, and is provided with a new grease supply means 5 on one side in the axial direction with respect to the raceway surfaces 1a and 2a and a mist recovery / resupply means 15 on the other side. Here, the mist collection / resupply means 15 is provided on the bearing back side, and the new grease supply means 5 is provided on the bearing front side. The new grease supply means 5 also serves as a seal on the front side of the bearing, so that grease leakage from the front side of the bearing is prevented. On the back side of the bearing, the mist collection / resupply means 15 also serves as a seal to prevent grease leakage from the back side of the bearing. In the figure, the portion indicated by the cross hatching in the new grease supply means 5 indicates a portion filled with grease.

  The new grease supply means 5 is provided in contact with the outer ring 2 and communicates with the grease reservoir forming part 6 having the grease reservoir 8 formed therein and from the grease reservoir 8 provided in the outer ring 2 to the vicinity of the raceway surface 2a of the outer ring 2. And a gap forming piece 7 that forms the gap 14 along the circumferential surface on which the raceway surface 2a is formed.

  The grease reservoir forming component 6 is a ring-shaped component having a grease reservoir 8 formed therein, and is provided in contact with the front side width surface of the outer ring 2. In this example, the grease reservoir forming component 6 includes an outer ring positioning spacer 9 provided in contact with the front side width surface of the outer ring 2 and an outward groove-type grease fitted to the inner diameter surface of the outer ring positioning spacer 9. It consists of a pool forming component main body 10. An internal space sandwiched between the outer ring positioning spacer 9 and the grease reservoir forming component main body 10 is a grease reservoir 8. The outer ring positioning spacer 9 has an engaging step 9 a that fits the tip of the side wall 10 a of the grease reservoir forming component main body 10 on the inner diameter surface opposite to the outer ring 2. The grease reservoir forming component main body 10 has the grease reservoir 8 filled with grease, and then engages the side wall portion 10a with the engaging step portion 9a of the outer ring positioning spacer 9, and a retaining ring on the inner diameter surface of the engaging step portion 9a. The outer ring positioning spacer 9 is fixed in the axial direction by a retaining ring (not shown) engaged with the groove. A sealing component (not shown) such as an O-ring is provided between the outer diameter surface of the side wall portion 10a of the grease reservoir forming component body 10 and the engaging stepped portion 9a of the outer ring positioning spacer 9, and the outer ring positioning. A sealing part 13 (FIG. 2) such as an O-ring is provided on the inner diameter surface of the adjacent portion between the spacer 9 and the outer ring 2 in contact with the spacer 9 to prevent grease leakage.

  The gap forming piece 7 has a ring shape that forms the gap 14 along the inner diameter surface 2 b (FIG. 2) of the outer ring 2. The gap forming piece 7 is formed integrally with the grease reservoir forming component main body 10. That is, the grease reservoir forming component main body 10 extends integrally from the outer diameter end portion of the side wall portion 10b adjacent to the bearing.

  As shown in an enlarged view in FIG. 2, in the angular ball bearing, the inner diameter surface 2 b of the outer ring counterbore portion on the front side is a tapered surface having a larger diameter on the width surface side from the ease of assembly of the rolling elements 3. The gap forming piece 7 extends to the vicinity of the outer ring raceway surface 2a so as to form a gap 14 having a predetermined gap amount δ along the tapered surface 2b. The gap 14 communicates with the grease reservoir 8. The gap amount δ of the gap 14 may be such that the gap 14 is held in a grease state when the gap 14 is filled with grease. The tip 7a of the gap forming piece 7 is brought close to the rolling element 3 so as not to contact the rolling element 3. The inner diameter surface of the tip portion 7a is an inclined surface 7aa that expands toward the rolling element 3 side. The inclined surface 7aa is configured such that when the grease enclosed in the bearing is scattered toward the inner diameter of the outer ring by centrifugal force during the operation of the bearing, the scattered grease is likely to accumulate at the tip 7a of the gap forming piece 7. It is a thing. In order to avoid interference with the cage 4, the inner diameter surface 7 b extending from the inclined surface 7 aa of the gap forming piece 7 to the outer diameter end portion of the side wall portion 10 b of the grease reservoir forming component main body 10 is provided on the rear side of the outer ring 2. It has a larger diameter than the cage guide surface 2d which is an inner diameter surface.

  In FIG. 1, a mist collection / resupply means 15 uses a collection means 16 for collecting grease mist generated in the bearing during operation, and uses the air flow generated by the rotation of the inner ring 1 for the mist collected by the collection means 16. And aggregating and feeding means 17 for making the oil oil by agglomerating and feeding it to the raceway surfaces 1a and 2a.

  The recovery means 16 includes a tapered surface 1b formed on the outer diameter surface of the inner ring 1, and a mist recovery component 18 that forms a mist recovery space 19 between the tapered surface 1b and the outer periphery of the tapered surface 1b. The mist collecting part 18 is provided with a communication path 20 communicating with the mist collecting space 19 from the mist floating space 21 in the bearing. The tapered surface 1b of the inner ring 1 is provided in the vicinity of the end in the width direction of the outer diameter surface on the bearing back side of the inner ring 1, and is formed so that the raceway surface 1a side has a large diameter.

  The mist collection component 18 is a member having an L-shaped schematic cross section composed of a cylindrical portion 18a concentric with the inner ring 1 and a flange-shaped mounting portion 18b extending from one end of the cylindrical portion 18a to the outer diameter side. The flange-shaped mounting portion 18b is bonded and fixed to the inner diameter surface of the ring-shaped recovery component fixing member 22 provided in contact with the width surface of the outer ring 2 on the bearing back side, so that the outer ring 2 is arranged in the axial direction. . Fixing of the mist recovery component 18 to the recovery component fixing member 22 may be performed by a retaining ring in addition to the bonding. By disposing the mist collecting component 18 so as to face the outer periphery of the tapered surface 1b of the inner ring 1, an mist having an annular tapered cross section is formed between the tapered surface 1b and the inner diameter surface 18c of the mist collecting component 18. A collection space 19 is formed.

  Specifically, the inner diameter surface 18c of the mist collecting component 18 has a small diameter portion 18ca on the end side away from the bearing, and a large diameter portion where a portion closer to the bearing from the small diameter portion 18ca forms a step with respect to the small diameter portion 18ca. 18 cb. The mist collection space 19 is surrounded by the tapered surface 1b of the inner ring 1, the outer diameter surface 23a of the inner ring spacer 23 in contact with the width surface of the inner ring 1 on the bearing back side, and the inner diameter surface large diameter portion 18cb of the mist collection component 18. Space. The roughness of the inner diameter surface large diameter portion 18cb of the mist recovery component 18 may be about Ra2-7. Thereby, as the mist collection | recovery component 18, the turning processed product, the press-worked product by a steel plate, or the resin-made molded product can be used. The inclination angle α (FIG. 3) with respect to the axial direction of the tapered surface 1b is set to α = 5 to 15 °, for example.

  The agglomeration feeding means 17 includes a step surface 1c provided in the vicinity of the raceway surface 1a on the outer diameter surface of the inner ring 1, and an outer diameter surface portion 1d extending from the small diameter side end of the step surface 1c to the taper surface 1b. And the agglomerated gap forming body 29. The agglomeration gap forming body 29 has an inner diameter surface 18cc and a front end surface 18d that are opposed to the outer circumference of the inner ring outer diameter surface portion 1d and the step surface 1c via gaps δ and C, respectively, and is provided in a fixed state together with the outer ring 1. The mist collecting component 18 includes a portion continuing to the distal end side of the cylindrical portion 18a. The agglomerated gap forming member 29 and the mist collecting part 18 constitute an agglomerated gap forming / mist collecting part 30. The step surface 1c is a surface having a large diameter on the raceway surface 1a side following the raceway surface 1a on the bearing back side, and is provided in a portion within the width of the rolling element 3, that is, immediately below the rolling element 3. The clearances of the clearances δ and C of the aggregating and feeding means 17 are, for example, δ = 0.15 to 0.3 mm and C = 0.2 to 0.4 mm.

  On the outer diameter surface of the tip portion of the aggregation gap forming body 29 facing the inner ring step surface 1c, the grease G is held in a tapered surface that holds the grease G in an attached state so that the adhered grease G can come into contact with the rolling element 3. A surface 18ea is provided. The cylindrical portion 18a of the mist recovery component 18 has a tapered surface 18e that is substantially the entire entry portion in the bearing on the outer diameter surface, and the grease adhesion holding surface 18ea is a part of the tapered surface 18e. The tapered surface 18e on the outer periphery of the cylindrical portion 18a plays a role of efficiently guiding the oily mist aggregated by the aggregation feeding means 17 to the mist collection space 19.

  The outer diameter surface of the cylindrical portion 18a of the mist collecting component 18 that is separated from the bearing after the tapered surface 18e is a recessed portion 18f that is recessed toward the inner diameter side, and penetrates from the recessed portion 18f to the larger inner diameter surface portion 18cb. Thus, the communication path 20 is formed. The communication path 20 includes through holes that are formed at a plurality of locations in the circumferential direction of the mist collection component 18 and penetrate through the inside and outside. A space surrounded by the recessed portion 18f of the mist recovery component 18, the bowl-shaped attachment portion 18b, and the recovery component fixing member 22 is a space that is continuous with the mist floating space 21 in the bearing, and is a front stage of the mist recovery space 19. The first-stage mist collection space 24, which is a collection space, is configured.

  According to the rolling bearing having the above-described configuration, the grease in the grease reservoir 8 is supplied by the new grease supply means 5 and the mist-recovered grease is reused by the mist recovery / resupply means 15. As a result, only grease that is sealed in the bearing is used to achieve high speed, long life, and maintenance-free operation. The operation of the new grease supply unit 5 and the specific operation of the mist recovery / resupply unit 15 will be described below.

(Operation of new grease supply means 5)
When the bearing is assembled, the grease reservoir 8 and the gap 14 are filled with grease. In addition, grease for initial lubrication is sealed in the bearing. By operating the bearing, the grease sealed in the bearing is scattered by centrifugal force, and a part of the grease is deposited on the outer ring raceway surface 2a and the tip 7a of the gap forming piece 7. As grease accumulates here, the grease reservoir 8 communicates with the rolling element contact portion 2aa (FIG. 2) of the outer ring raceway surface 2a. That is, the grease reservoir 8 and the rolling element contact portion 2aa of the outer ring raceway surface 2a are connected by the grease. For this reason, the base oil in the grease permeates and moves due to the capillary action of the thickener, and the base oil consumed as lubricating oil in the rolling element contact portion 2aa passes through the gap 14 from the grease reservoir 8 to the rolling element contact portion. 2aa is replenished continuously. Therefore, the lubrication life of this bearing is determined by the grease consumption at the rolling element contact portion 2aa and the grease pool capacity at the grease reservoir 8.

  In this way, the grease base oil that is consumed as the lubricating oil in the rolling element contact portion 2aa of the outer ring raceway surface 2a is continuously supplied from the entire circumference of the bearing. In addition, since the lubrication life of the bearing is determined by the amount of grease in the grease reservoir 8, designing a grease reservoir capacity corresponding to the required life makes it possible to extend the service life of maintenance-free high-speed operation.

The features obtained by the new grease supply means 5 in the rolling bearing of this embodiment are summarized as follows.
1) Can be used without maintenance.
2) Since the lubricant is supplied using capillary action, the consumed amount is continuously replenished, and the speed can be increased.
3) The grease reservoir 8 can be designed according to the required life.
4) Grease lubrication can increase the speed of air-oil lubrication, and replacing air-oil lubrication with this lubrication method can reduce costs, reduce noise, and save energy.

(Operation of Mist Collection / Resupply Unit 15)
When the inner ring 1 of the bearing filled with grease rotates, a part of the base oil in the grease becomes mist on the raceway surfaces 1a and 2a of the inner and outer rings 1 and 2 due to contact with the rolling elements 3 that roll, and the inside of the bearing It floats in the mist floating space 21. The mist generated in this way is moved in the direction of the arrow in FIG. 1 while rotating in the bearing by the air current generated by the revolution of the rolling element 3, and is surrounded by the recovery component fixing member 22 and the mist recovery component 18. Flow into the pre-stage mist collection space 24. Since the upstream mist recovery space 24 and the mist recovery space 19 communicate with each other through the communication path 20, the mist in the upstream mist recovery space 24 further flows into the mist recovery space 19 due to the pressure difference between the spaces 24 and 19.

  The mist in the mist collection space 19 is sucked in while being accelerated toward the inside of the bearing in the mist collection space 19 by a pumping action by the rotation of the inner ring taper surface 1b as shown in an enlarged view in FIG. Thus, the mist floating in the mist floating space 21 can be efficiently recovered by the simple configuration of the recovery means 16. As a result, the mist moves and collides with the inner diameter surface large diameter portion 8cb of the mist recovery component 18 facing the inner ring outer diameter surface portion 1d, and mist aggregation occurs.

The agglomerated mist becomes oily and adheres to the inner diameter surface large diameter portion 18cb. The adhering oil moves toward the inside of the bearing by the air flow in the gap δ, and is discharged into the bearing as bearing lubricating oil from the gap C at the tip of the cylindrical portion 18a of the mist collecting component 18.
As a configuration for promoting such mist movement, the outer diameter surface of the inner ring 1 forms a tapered surface 1b from the small diameter end of the step surface 1c to the width surface side, and a cylindrical outer diameter surface portion 1d in the middle is formed. May be omitted. In this case, the agglomeration gap δ is formed by the tip of the tapered mist collection space 19.

  Since the inner ring step surface 1c constituting the radial discharge gap C is provided within the width of the rolling element 3 following the track surface 1a of the inner ring 1, oil discharge to the inner ring track surface 1a is more effectively performed. Is called. Here, in order to reliably discharge the oil into the bearing, as shown by the hatching crossing FIGS. 3 and 4, the tapered surface-shaped grease adhesion holding surface 18ea formed of the outer diameter surface of the cohesive gap forming body 29 is formed. Grease G is attached to the entire circumference to reduce the actual gap C of the oil discharge part. The adhesion of grease to the outer diameter surface of the mist recovery component 18 may be caused by accumulation caused by operating in an initial grease filled state.

  Thus, in the lubricating action of the mist recovery / resupply means 15 in this rolling bearing, the base oil mist generated during operation in grease lubrication is recovered and reused, so that the lubrication life can be extended. Also, unlike the conventional method of replenishing grease from the outside by rotating the inner ring, the enclosed grease is circulated and lubricated with a small amount of lubricating oil, which causes excessive supply of grease and the cause of temperature rise due to stirring resistance Therefore, the rotation speed can be increased.

  As described above, this rolling bearing achieves high speed, long life, and maintenance-free operation by using only the grease enclosed in the bearing by the action of the new grease supply means 5 and the mist recovery / resupply means 15 described above. it can. In addition, the new grease supply means 5 and the mist recovery / resupply means 15 are not excessively supplied with grease, and the temperature can be stabilized by a small amount of lubrication.

  In this embodiment, both the grease pool forming component 6 in the new grease supply means 5 and the recovery means 16 in the mist recovery / resupply means 15 are provided adjacent to the outer ring 2 in the axial direction. Compared with the case where it is accommodated within the outer ring width, the grease supply action area by the new grease supply means 5 and the mist collection action area by the mist collection / resupply means 15 can be secured widely, and these actions can be performed effectively. it can. Even when only one of the grease reservoir forming component 6 and the recovery means 16 is provided adjacent to the outer ring 2 in the axial direction, a wide working area can be secured.

  FIG. 5 shows an example of a spindle device for machine tools using the rolling bearing of the above embodiment. In the spindle device for machine tools, two of the rolling bearings are used as a back surface combination. The two rolling bearings 33 and 34 rotatably support both ends of the main shaft 31 in the housing 32. The inner ring 1 of each rolling bearing 33, 34 is positioned by an inner ring positioning spacer 36 and an inner ring spacer 37, and is fastened and fixed to the main shaft 31 by an inner ring fixing nut 39. The outer ring 2 is positioned and fixed in the housing 32 by an outer ring positioning spacer 9, an outer ring spacer 40 and outer ring presser covers 41 and 42. The housing 32 is formed by fitting a housing inner cylinder 32A and a housing outer cylinder 32B, and an oil passage groove 43 for cooling is provided in the fitting portion.

  The spindle 31 is provided with a chuck (not shown) for detachably attaching a tool or a work (not shown) to the front end 31a, and a drive source such as a motor is rotated and transmitted to the rear end 31b. They are connected via a mechanism (not shown). The motor may be built in the housing 32. The spindle device can be applied to various machine tools such as a machining center, a lathe, a milling machine, and a grinding machine.

  According to the spindle device having this configuration, the rolling bearings 33 and 34 of this embodiment can effectively exhibit the effects of speeding up, extending the service life, and maintaining maintenance.

  FIG. 6 shows another embodiment of the present invention. This embodiment is the rolling bearing lubrication structure of the embodiment shown in FIGS. 1 to 4, and the inner diameter surface 18 cc of the agglomerated gap forming body 29 constituting the gap δ of the agglomerated feeding means 17 with the outer diameter surface portion 1 d of the inner ring 1. An oil sump groove 26 extending in the circumferential direction is provided. Other configurations are the same as those in the embodiment of FIGS.

  In this embodiment, the mist aggregated oil that has moved from the mist collection space 19 to the gap δ of the aggregation feeding means 17 is temporarily stored in the oil reservoir groove 26, so that the oil droplets discharged from the gap C become larger and mist aggregation occurs. Oil can be reliably supplied into the bearing as lubricating oil. In addition, as a means for reliably supplying the mist aggregated oil into the bearing, an oil repellent is applied to at least one of the inner diameter surface large diameter portion 18cb of the mist collecting component 18 and the inner diameter surface 18cc of the aggregation gap forming body 29, and the aggregated oil It may be possible to improve the oil supply into the bearing by deteriorating the adhesion.

  FIG. 7 shows still another embodiment of the present invention. This embodiment constitutes a grease storage forming part 6A integrated with a gap forming piece 7 constituting a new grease supply means 5 and a mist recovery and resupply means 15 in the rolling bearing lubrication structure of the embodiment of FIGS. The mist collecting part 18 to be fixed is fixed to the inner surface of the outer ring 2 so that both the parts 6 and 18 are incorporated in the bearing. That is, the new grease supply means 5 forms the grease reservoir 8 inside the bearing space between the inner and outer rings 1 and 2 by disposing the grease reservoir forming component 6A on the inner diameter surface 2e of the outer ring 2. In this example, the outer ring positioning spacer 9 in the example of FIGS. 1 to 4 is not a component part of the grease pool forming component 6A, and is a single component corresponding to the grease pool forming component body 10 in the examples of FIGS. Thus, the grease reservoir forming component 6A is configured. The grease reservoir forming component 6A has an outward groove-shaped cross-sectional shape, and the gap forming piece 7 is integrally provided. The gap forming piece 7, the gap 14 formed by the gap forming piece 7 and the outer ring inner surface 2b, and other configurations are the same as those in the embodiment of FIGS.

  In this embodiment, although the grease reservoir 8 of the new grease supply means 5 and the mist recovery space 19 of the mist recovery / resupply means 15 are reduced, the outer ring positioning spacer 9 for fixing the grease reservoir forming component 6A, and the mist recovery component Since the recovery component fixing member 22 for fixing the member 18 can be omitted, the number of components can be reduced, and the assembly workability of the rolling bearing to the device can be improved.

  FIG. 8 shows still another embodiment of the present invention. As in the embodiment of FIG. 7, this embodiment also includes a grease reservoir forming part 6 </ b> A integral with the gap forming piece 7 constituting the new grease supplying means 5 and a mist collecting part 18 constituting the mist collecting / refeeding means 15. These parts 6A and 18 are incorporated in the bearing by being fixed to the inner surface of the outer ring 2.

  In particular, in this embodiment, the length from the center of the raceway surface 2a of the outer ring 2 to the width surface on the bearing back side is made longer than the length on the bearing front side which is the arrangement side of the grease reservoir forming component 6A, A grease reservoir forming component 6A is fitted to the elongated outer ring inner surface 2e. In this case, the inner and outer rings 1 and 2 have the same width dimension, the width dimension is larger than the standard dimension, and a grease pool is formed on the inner diameter surface 2e of the portion where the width dimension of the outer ring 2 is increased as described above. The forming component 6A is fitted. The above-described portions 1A and 2A, in which the width dimensions of the inner and outer rings 1 and 2 are increased, serve as a widening portion for accommodating the new grease supply means 5.

The portion of the inner diameter surface 2b following the raceway surface 2a of the outer ring 2 is a tapered surface in consideration of the built-in property of the rolling element 3 as in the angular ball bearing shown in FIGS. A grease reservoir forming component 6A is fitted to a cylindrical inner surface 2e following the inner surface 2b. An internal space sandwiched between the inner diameter surface 2e and the grease reservoir forming component 6A is a grease reservoir 8.
A gap forming piece 7 is integrally formed at the outer diameter end of the side wall portion 6b of the grease reservoir forming component 6A, and the gap forming piece 7 is extended along the inner diameter surface 2b of the outer ring 2 to the vicinity of the raceway surface 2a. The formation of the gap 14 and the gap amount of the gap 14 are the same as those in the embodiment of FIGS.
The side wall 6a outside the bearing of the grease reservoir forming component 6A is engaged with an engaging step 2f formed on the inner surface 2e of the outer ring, and a retaining ring that engages with a retaining ring groove on the inner surface of the engaging step 2f. 25 is fixed in the axial direction.

  The inner diameter surface of the inner ring 1 where the width dimension is increased is a small diameter surface portion 1e having a smaller diameter than the portion of the inner diameter surface 1b adjacent to the raceway surface 1a. The grease reservoir 8 is widely secured by projecting the inner diameter portion of the grease reservoir forming component 6A toward the small-diameter surface portion 1e.

  Further, the length to the width surface on the bearing back side, which is the arrangement side of the mist collection component 8, is also made longer than the standard dimension, and the flange-like mounting portion 18b of the mist collection component 18 is fitted to the elongated outer ring inner surface 2g. The axial positioning is achieved by the retaining ring 27 or the like. In this case, an outer diameter surface portion 1f having a smaller diameter than the inner ring outer diameter surface portion 1d constituting the gap δ is formed from the tapered surface 1b to the width surface. Accordingly, the mist collection space 19 is configured by being surrounded by the tapered surface 1 b and the outer diameter surface portion 1 f of the inner ring 1 and the inner diameter surface large diameter portion 18 cb of the mist collection component 18. The above-described portions 1B and 2B, in which the width dimensions of the inner and outer rings 1 and 2 are increased, serve as a widening portion for accommodating the mist collection and resupply means 15.

  9 and 10 show still another embodiment of the present invention. In this embodiment, the lubricating structure of the embodiment shown in FIGS. 1 to 4 is applied to a cylindrical roller bearing, and an inner ring step surface 1 c is provided on a flange 1 g of the inner ring 1. The step surface 1 c is provided at a position within the width of the cage 4 that holds the rolling element 3. Furthermore, a stepped surface 18g that avoids interference with the cage 4 is formed on the outer diameter surface of the mist collecting component 8 on the distal end side of the cylindrical portion 8a. Other configurations are the same as those in the embodiment of FIGS.

It is sectional drawing of the rolling bearing concerning 1st Embodiment of this invention. It is a partial expanded sectional view of the new grease supply means in the rolling bearing. It is a partial expanded sectional view of the mist collection | recovery resupply means in the rolling bearing. It is operation | movement explanatory drawing of the new grease supply means in the rolling bearing. It is sectional drawing of the spindle apparatus for machine tools using the rolling bearing. It is a partial expanded sectional view of the mist collection | recovery resupply means in the rolling bearing concerning other embodiment of this invention. It is sectional drawing of the rolling bearing concerning further another embodiment of this invention. It is sectional drawing of the rolling bearing concerning further another embodiment of this invention. It is sectional drawing of the rolling bearing concerning further another embodiment of this invention. It is a partial expanded sectional view of the mist collection | recovery resupply means in the rolling bearing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Inner ring 1a ... Raceway surface 1b ... Tapered surface 1c ... Step surface 1d ... Outer diameter surface part 2 ... Outer ring 2a ... Raceway surface 3 ... Rolling element 5 ... New grease supply means 6, 6A ... Grease accumulation forming part 7 ... Gap formation Piece 8 ... Grease reservoir 14 ... Clearance 15 ... Mist collection / resupply means 16 ... Collection means 17 ... Aggregation feed means 18 ... Mist collection part 18c ... Inner diameter surface 18d ... Tip face 19 ... Mist collection space 20 ... Communication path 21 ... Mist floating Space 29 ... Aggregate gap forming body 30 ... Aggregate gap forming / mist collecting parts 1A, 1B, 2A, 2B ... Widened portions δ, C ... Gaps

Claims (10)

  In a rolling bearing having an inner ring, an outer ring, and a plurality of rolling elements interposed between the raceways of the inner and outer rings, the inner ring is on the rotating side and the outer ring is on the fixed side. New grease supply means for replenishing the grease accumulated in the vicinity of the raceway surface was provided, and on the other hand, mist collection and resupply means for collecting the mist in the bearing and returning it to the vicinity of the raceway surface as agglomerated state was provided. Rolling bearing characterized by   2. The grease supply means according to claim 1, wherein the new grease supply means communicates from a grease reservoir forming part provided in contact with the outer ring and forming a grease reservoir therein to the vicinity of the raceway surface of the outer ring provided in the outer ring. A gap forming piece that forms a gap along the circumferential surface on which the raceway surface is formed, and the gap does not collect grease, and the base oil of the grease causes the capillary action of the thickener to cause the raceway surface of the outer ring. Rolling bearing with a slight gap that can be supplied to the vicinity.   3. The mist recovery and resupply means according to claim 1 or 2, wherein the mist recovery and resupply means uses a recovery means for recovering mist generated in the bearing during operation and an air flow generated by rotation of an inner ring of the mist recovered by the recovery means. A rolling bearing provided with an agglomeration feeding means for making it oily by agglomerating and sending it to the raceway surface.   4. A step surface in which the agglomeration feeding means is provided in the vicinity of the raceway surface on the outer diameter surface of the inner ring so that the raceway surface side has a large diameter, and an inner ring outer diameter surface portion following the small diameter side end of the step surface. And an agglomerated gap forming body that has an inner diameter surface and a tip surface facing the outer circumference of the inner ring outer diameter surface portion and the step surface via a gap, and is provided in a fixed state with respect to the outer ring.   5. The recovery means according to claim 3, wherein the collecting means is annularly formed between a tapered surface formed on the outer diameter surface of the inner ring and having a large diameter on the raceway surface, and the tapered surface facing the outer periphery of the tapered surface. A rolling bearing comprising: a mist collecting part that forms a mist collecting space having a tapered cross-sectional shape; and a communication path that is provided in the mist collecting part and communicates with the mist collecting space from a mist floating space in the bearing.   4. A step surface in which the agglomeration feeding means is provided in the vicinity of the raceway surface on the outer diameter surface of the inner ring so that the raceway surface side has a large diameter, and an inner ring outer diameter surface portion following the small diameter side end of the step surface. And an agglomerated gap forming body having an inner diameter surface and a tip surface facing the outer periphery of the inner ring outer diameter surface portion and the stepped surface via a gap, and the recovery means is formed on the outer diameter surface of the inner ring. Provided in this mist recovery part, a tapered surface with a large diameter on the surface side, a mist recovery part that forms an annular, tapered cross-sectional mist recovery space between the taper surface and the outer periphery of the taper surface A rolling bearing comprising a communication path communicating from the mist floating space in the bearing to the mist recovery space, wherein the aggregated gap forming body and the mist recovery component are integrated with each other as an aggregated clearance formation / mist recovery component.   In any one of Claims 1 thru | or 6, both the said new grease supply means and the said mist collection | recovery resupply means or any one is provided adjacent to the outer ring in the axial direction, and one part is A rolling bearing that falls within the outer ring width.   The rolling bearing according to any one of claims 1 to 6, wherein both or one of the new grease supply means and the mist recovery / resupply means is within the width of the outer ring.   9. The widening part for accommodating the said new grease supply means and mist collection | recovery resupply means is provided in the both sides of an inner ring | wheel and an outer ring | wheel, and both the new grease supply means and mist collection | recovery resupply means are made into the width | variety of an outer ring | wheel. Rolling bearings housed inside. The rolling bearing according to any one of claims 1 to 9, wherein the rolling bearing is used for supporting a main shaft of a machine tool.

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