JP6369710B2 - Bearing device - Google Patents

Description

  The present invention relates to a bearing device.

  An angular ball bearing of a rolling bearing device disclosed in Patent Literature 1 below includes an inner ring fitted to a main shaft, an outer ring, a plurality of balls interposed between the inner ring and the outer ring, and a plurality of balls in the circumferential direction. And a retainer for holding at predetermined intervals. An annular groove is formed at both axial ends of the inner periphery of the outer ring. The annular groove is filled with grease. A guide surface for guiding the rotation of the cage is formed on the inner peripheral surface of the outer ring. The annular groove is provided adjacent to the guide surface. On the other hand, the cage is provided with a pair of annular portions that are spaced apart from each other by a predetermined distance in the axial direction. The outer peripheral surface of each annular portion is configured as a guided surface that is in sliding contact with the guide surface of the outer ring. Therefore, the base oil contained in the grease in the annular groove can be supplied between the guide surface and the guided surface. Thus, the base oil can lubricate the space between the guide surface and the guided surface, and can also lubricate the balls and the raceway surfaces of the balls in each of the inner ring and the outer ring.

International Publication WO2010 / 010897 Pamphlet

In the rolling bearing device of Patent Document 1, since the base oil of the grease flows out along the inner peripheral surface of the outer ring, the base oil does not need to be lubricated even when the angular ball bearings need not be lubricated (for example, when the spindle is stopped). It will flow unnecessarily. This makes it difficult to lubricate the angular ball bearings for a long time due to the decrease in base oil.
In addition, if the rolling bearing device is used for a long time, bubbles are generated in the base oil of the grease, and the base oil is blocked by the bubbles, so that it is difficult to transmit from the annular groove to the guided surface and the guided surface. There is also.

  The present invention has been made under such a background, and an object thereof is to provide a bearing device capable of maintaining bearing lubrication for a long period of time.

The invention according to claim 1 includes an inner ring (5), an outer ring (6), a plurality of rolling elements (7) disposed between the inner and outer rings, and a cage (8) for holding the plurality of rolling elements. A bearing (3), a spacer (4) disposed adjacent to the bearing, a lubricant reservoir (26) provided in the spacer and storing a lubricant (27), and provided in the spacer And a resin guide member (25) inserted between the inner and outer rings and guiding the retainer or the outer ring, in contact with the lubricant in the lubricant reservoir, and an outer peripheral surface of the guide member and One of the inner peripheral surface of the cage and the inner peripheral surface of the guide member and the outer peripheral surface of the cage is in contact with each other, and the lubricant in the lubricant reservoir is transmitted through the guide member. A contact portion between the outer peripheral surface of the guide member and the inner peripheral surface of the cage, or Penetrates an inner peripheral surface of serial guide member and the contact portion between the outer peripheral surface of the retainer and through the contact portion where the lubricant has penetrated, it is configured to be supplied to a plurality of the rolling elements It is a bearing apparatus (1) characterized by having.

The invention according to claim 2 is the bearing device according to claim 1, wherein the resin has liquid absorbency.
The invention according to claim 3 is the bearing device according to claim 2, wherein the resin is nylon 66.
The invention according to claim 4 is the bearing device according to any one of claims 1 to 3, wherein the guide member guides the cage.
According to a fifth aspect of the present invention, an air hole penetrating the spacer is formed in the spacer, and the air hole communicates with the lubricant reservoir, and between the inner ring and the outer ring. The bearing device according to claim 1, wherein the bearing device communicates with the space.
In addition, in the above, the numbers in parentheses represent reference numerals of corresponding components in the embodiments described later, but the scope of the claims is not limited by these reference numerals.

  According to the first aspect of the present invention, the bearing in the bearing device includes an inner ring, an outer ring, a plurality of rolling elements disposed between the inner and outer rings, and a cage that holds the plurality of rolling elements. A lubricant reservoir and a guide member are provided in a spacer adjacent to the bearing. A lubricant is stored in the lubricant reservoir. The guide member contacts the lubricant in the lubricant reservoir and is inserted between the inner and outer rings to guide the cage or the outer ring.

The lubricant in the lubricant reservoir enters between the cage and the guide member via the guide member and permeates between the inner ring and the outer ring and the rolling elements to lubricate the entire bearing.
Here, since the guide member is made of resin, the lubricant can be retained to some extent as compared with the case of being made of metal.
In particular, if the guide member is a resin having a liquid-absorbing property as in the second aspect of the invention, the guide member can absorb the lubricant in the portion of the lubricant reservoir that contacts the lubricant and store it inside. it can. Unlike the case where the guide member is made of metal, the lubricant absorbed by the guide member does not flow unnecessarily along the surface of the guide member, and oozes out from the guide member as necessary. This contributes to the lubrication of the bearing. Moreover, if it is a guide member comprised with resin which has a liquid absorptivity, it can suppress that the bubble which becomes the obstacle of lubrication generate | occur | produces in a lubricant.

As a result, in this bearing device, the lubrication of the bearing can be maintained for a long time.
As in the third aspect of the invention, nylon 66 can be used as the resin that constitutes the guide member and has liquid absorbency.

FIG. 1 is a cross-sectional view taken along a plane along the axial direction X of a bearing device 1 according to an embodiment of the present invention. FIG. 2 is an enlarged view of a main part in FIG. FIG. 3 is a diagram comparing water absorption between the material used for the guide member 25 and other materials. FIG. 4 is a diagram in which a modification of the present invention is applied to FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view taken along a plane along the axial direction X of a bearing device 1 according to an embodiment of the present invention. FIG. 2 is an enlarged view of a main part in FIG.
Referring to FIG. 1, a bearing device 1 is a rolling bearing device that supports a cylindrical rotary shaft 2 in a machine (here, a machine tool), for example.

  Here, in the axial direction of the rotating shaft 2, a symbol “X” is given. In addition, the symbol “R” is attached to the radial direction of the rotating shaft 2, and the symbol “C” is attached to the circumferential direction of the rotating shaft 2. In FIG. 1, the axial direction X coincides with the direction extending to the left and right of the page. Further, the vertical direction of the paper surface in FIG. In the radial direction R, the rotation shaft 2 side (side approaching the rotation shaft 2) is referred to as “inside”. In the radial direction R, the side opposite to the rotating shaft 2 side (the side away from the rotating shaft 2) is referred to as “outside”. FIG. 2 is an enlarged cross-sectional view of a portion above the rotating shaft 2 in FIG. Note that the posture of each member in FIG. 2 matches that in FIG.

  The bearing device 1 includes a bearing 3 made of, for example, an angular ball bearing, and a spacer 4 provided adjacent to the bearing 3 from the axial direction X. The entire bearing device 1 is accommodated in a housing 24 of a machine tool. The housing 24 is formed with a round insertion hole 24A through which the rotary shaft 2 is inserted. A portion that defines the insertion hole 24A in the housing 24 is referred to as an inner peripheral surface 24B. The inner circumferential surface 24B is a circumferential surface that is coaxial with the rotary shaft 2.

The bearing 3 includes an inner ring 5, an outer ring 6, a plurality of rolling elements 7, a cage 8, and a seal 9.
The inner ring 5 is an annular body that is coaxial with the rotary shaft 2 and is fitted (press-fitted). The inner ring 5 can rotate integrally with the rotary shaft 2. Referring to FIG. 2, an inner ring raceway surface 10 that is recessed in an arc shape inward in the radial direction R is provided at a substantially central portion in the axial direction X on the outer circumferential surface 5 </ b> A of the inner ring 5. On the outer peripheral surface 5A, inner ring raceway shoulder portions 11 and 12 are provided on both sides of the inner ring raceway surface 10 in the axial direction X. In FIG. 2, the inner ring raceway shoulder 11 is located on the left side of the inner ring raceway surface 10, and the inner ring raceway shoulder 12 is located on the right side of the inner ring raceway surface 10. Further, the inner ring raceway shoulder 12 has a larger diameter than the inner ring raceway shoulder 11. In FIG. 2, a left side portion 13 is provided in the inner ring 5 on the left side of the inner ring raceway shoulder 11. The outer peripheral surface 5 </ b> A in the left side portion 13 has a smaller diameter than the inner ring raceway shoulder 11. On the other hand, in FIG. 2, a right side portion 38 is provided on the inner ring 5 on the right side of the inner ring raceway shoulder 12. The outer peripheral surface 5A of the right side portion 38 has a diameter that is gradually smaller than the inner ring raceway shoulder 12 as it goes to the right side. The right portion 38 is provided with an annular groove 29 that is recessed inward in the entire circumference in the circumferential direction C.

  The outer ring 6 is an annular body that is fitted (press-fitted) into the insertion hole 24A of the housing 24 of the machine tool (see FIG. 1). The outer ring 6 is fixed to the housing 24 in each of the axial direction X, the radial direction R, and the circumferential direction C. Therefore, even when the rotating shaft 2 rotates around the axis, the relative position of the outer ring 6 in the housing 24 does not change. The outer ring 6 is fitted in a non-contact and coaxial manner with respect to the inner ring 5. The dimension of the outer ring 6 in the axial direction X is substantially the same as that of the inner ring 5. On the inner peripheral surface 6A of the outer ring 6, an outer ring raceway surface 14 that is recessed in an arc shape toward the outside is provided at a substantially central portion in the axial direction X. Outer ring raceway shoulder portions 15 and 16 are provided on both sides of the outer ring raceway surface 14 in the axial direction X on the inner peripheral surface 6A. In FIG. 2, the outer ring raceway shoulder 15 is located on the left side of the outer ring raceway surface 14, and the outer ring raceway shoulder 16 is located on the right side of the outer ring raceway surface 14. Further, the outer ring raceway shoulder 16 has a larger diameter than the outer ring raceway shoulder 15. In the outer ring raceway shoulder 16, a step 20 is provided at one place in the axial direction X, and the portion on the right side of the step 20 in FIG. 2 has a larger diameter. In FIG. 2, a left side portion 17 is provided on the left side of the outer ring raceway shoulder 15. The inner peripheral surface 6 </ b> A in the left portion 17 has a larger diameter than the outer ring raceway shoulder 15. On the other hand, a right side portion 39 is provided on the right side of the outer ring raceway shoulder 16. The inner peripheral surface 6 </ b> A in the right side portion 39 has a larger diameter than the outer ring raceway shoulder 16. The right portion 39 is formed with an annular groove 28 that is recessed outward in the entire circumference in the circumferential direction C.

An annular space 18 is provided between the outer peripheral surface 5 </ b> A of the inner ring 5 and the inner peripheral surface 6 </ b> A of the outer ring 6. The annular space 18 is an annular shape extending along the circumferential direction C, and is exposed to the outside from the bearing 3 on both sides in the axial direction X.
The seal 9 has a thin annular shape in the axial direction X, and is provided at an end 18A on the right side of the annular space 18 in FIG. 2, and closes the end 18A from the axial direction X. An outer end 9 </ b> A of the seal 9 is press-fitted and fixed to the annular groove 28 formed in the right side portion 39 of the inner peripheral surface 6 </ b> A of the outer ring 6. On the other hand, the inner end portion 9B of the seal 9 is fitted into the annular groove 29 formed in the right side portion 38 of the inner peripheral surface 5B of the inner ring 5 with a slight gap therebetween, and the non-contact that constitutes the labyrinth. A seal is formed.

  The plurality of rolling elements 7 are spherical. The plurality of rolling elements 7 are arranged at equal intervals in the circumferential direction C in the annular space 18. That is, the plurality of rolling elements 7 are disposed between the inner ring 5 and the outer ring 6 (between the inner and outer rings). The outer diameter of each rolling element 7 coincides with the difference between the radius of the inner ring raceway surface 10 and the radius of the outer ring raceway surface 14. Therefore, each rolling element 7 is in surface contact with the inner ring raceway surface 10 and the outer ring raceway surface 14.

  The cage 8 is disposed in the annular space 18. The cage 8 includes an annular portion 19 having an annular shape. The annular portion 19 is arranged coaxially with the annular space 18. In the annular portion 19, a plurality of through holes 21 are formed in the circumferential direction C so as to be arranged at equal intervals. Each through hole 21 passes through the annular portion 19 in the radial direction R. One rolling element 7 is arranged in each through hole 21 of the cage 8. Therefore, the cage 8 holds a plurality of rolling elements 7.

The spacer 4 as a whole has an annular shape that is coaxial with the rotary shaft 2 (see FIG. 1), and includes an inner ring spacer 22 and an outer ring spacer 23. The circumferential direction of the spacer 4 (the inner ring spacer 22 and the outer ring spacer 23) coincides with the circumferential direction C of the rotary shaft 2.
The inner ring spacer 22 has an annular shape and is externally fitted (press-fitted) coaxially with the rotating shaft 2 (see FIG. 1). The inner ring spacer 22 is disposed adjacent to the inner ring 5 (bearing 3) from the axial direction X (from the left side in FIG. 2). The outer peripheral surface 22A of the inner ring spacer 22 is substantially flush with the outer peripheral surface 5A of the left side portion 13 of the inner ring 5. The inner ring spacer 22 rotates together with the rotating shaft 2 together with the inner ring 5.

  The entire outer ring spacer 23 is an annular body and is coaxially fitted (press-fitted) into the inner peripheral surface 24B of the housing 24. The outer ring spacer 23 is fixed to the housing 24 in the axial direction X, the radial direction R, and the circumferential direction C, and is fixed to the housing 24 even when the rotary shaft 2 rotates about the axis. Further, the outer ring spacer 23 is disposed on the outer side with an interval from the inner ring spacer 22. In this state, the outer peripheral surface 23 </ b> A of the outer ring spacer 23 is flush with the outer peripheral surface 6 </ b> B of the outer ring 6. Further, the outer ring spacer 23 is disposed adjacent to the outer ring 6 (bearing 3) from the axial direction X (from the left side in FIG. 2). Further, in FIG. 2, a protrusion 23C is formed on the right end (end adjacent to the bearing 3) 23B of the outer ring spacer 23, and the protrusion 23C is located on the right side of the inner ring spacer 22 (on the bearing 3 side). ). In this state, the left side portion 17 is located outside the protrusion 23C. The outer ring spacer 23 is provided with a lubricant reservoir 26 and a guide member 25.

The lubricant reservoir 26 is a groove 40 formed in a concave shape from the inner peripheral surface 23 </ b> D of the outer ring spacer 23 toward the outside in the radial direction R, and is provided in the entire region in the circumferential direction C. The lubricant reservoir 26 is exposed from the inner peripheral surface 23D of the outer ring spacer 23 to the inside in the radial direction R. That is, in FIG. 2, the outer ring spacer 23 has a substantially U-shaped cross section that is upside down.
The lubricant reservoir 26 stores a lubricant 27 such as grease. As the grease, a urea compound, Ba complex soap, Li complex soap or the like as a thickener, and ester, polyalphaolefin or the like as a base oil 41 can be used. The lubricant 27 of this embodiment includes a base oil 41.

  The guide member 25 is annular. The guide member 25 is coaxial with the inner ring spacer 22 and is externally fitted to the inner ring spacer 22 in a non-contact manner. The guide member 25 is in contact with the inner peripheral surface 23D of the end 23B of the outer ring spacer 23 on the outer peripheral surface 25A. Further, the guide member 25 is fixed to the left end portion (end portion opposite to the end portion 23B in the axial direction X) 23E of the outer ring spacer 23 in FIG. In this state, the guide member 25 closes the lubricant reservoir 26 from the inside, but strictly speaking, there is a slight gap between the inner peripheral surface 23D of the outer ring spacer 23 and the outer peripheral surface 25A of the guide member 25. A gap 34 is provided. Since the lubricant 27 is stored in the lubricant reservoir 26, the guide member 25 is in contact with the lubricant 27 of the lubricant reservoir 26 on the left side of the outer peripheral surface 25A.

The end face 25B of the guide member 25 on the left side in the axial direction X in FIG. 2 is flush with the end face 23F on the left side in the axial direction X of the outer ring spacer 23. The end face 25B is also flush with the left end face 22B of the inner ring spacer 22.
On the other hand, the end portion 25 </ b> C of the guide member 25 on the right side in FIG. 2 enters the annular space 18 of the bearing 3 from the axial direction X. In other words, the guide member 25 is inserted between the inner and outer rings. In this state, the end portion 25 </ b> C is in a position overlapping with the left end portion 19 </ b> A of the annular portion 19 of the cage 8 in the axial direction X. In this state, the outer peripheral surface 25A on the end portion 25C side of the guide member 25 is in contact with the inner peripheral surface 19B on the end portion 19A side of the annular portion 19 from the inner side in the radial direction R. Therefore, the cage 8 is accommodated in the annular space 18 in a predetermined posture that is not in contact with the outer peripheral surface 5A of the inner ring 5 and the inner peripheral surface 6A of the outer ring 6 without being inclined with respect to the axial direction X. ing.

Thus, the guide member 25 is in contact with the lubricant 27 on the left side of the outer peripheral surface 25A, and the inner peripheral surface of the annular portion 19 of the cage 8 on the right side (strictly, the end portion 25C) of the outer peripheral surface 25A. It is in contact with 19B.
Next, the operation of the bearing device 1 will be described.
With reference to FIG. 1, the inner ring 5 and the inner ring spacer 22 rotate integrally with the rotating shaft 2 along with the rotation of the rotating shaft 2 by the drive of the machine tool described above. On the other hand, the outer ring 6 and the outer ring spacer 23 are fixed to the housing 24 and do not rotate.

  As described above, each rolling element 7 in the annular space 18 is in contact with the inner ring raceway surface 10 of the inner ring 5 and the outer ring raceway surface 14 of the outer ring 6. Therefore, as the inner ring 5 rotates, each rolling element 7 rolls by moving along the circumferential direction C while rotating. At that time, the cage 8 holds the rolling elements 7 in the through holes 21. Therefore, the interval between the adjacent rolling elements 7 in the circumferential direction C is kept constant. Further, the entire cage 8 moves along the circumferential direction C in accordance with the rolling of each rolling element 7. At this time, the guide member 25 guides the cage 8 so that the cage 8 is maintained in the predetermined posture described above. Therefore, the cage 8 can move in the circumferential direction C stably. Thus, the cage 8 rotates relative to the guide member 25 in a state where it is in contact with the guide member 25. As described above, when the inner ring 5 and the inner ring spacer 22 rotate, the rolling elements 7 roll, and the cage 8 moves along the circumferential direction C, the bearing device 1 is in an operating state.

  Here, a portion where the outer peripheral surface 25A of the guide member 25 and the inner peripheral surface 19B of the annular portion 19 are in contact is referred to as a first contact portion 30. Further, a portion where the inner ring raceway surface 10 and each rolling element 7 are in contact will be referred to as a second contact portion 31. A portion where the outer ring raceway surface 14 and each rolling element 7 are in contact with each other is referred to as a third contact portion 32. In order to lubricate the first contact portion 30, the second contact portion 31, and the third contact portion 32 when the bearing device 1 is in operation, the lubricant reservoir 26 of the outer ring spacer 23 is provided with the lubricant described above. 27 is stored. Strictly speaking, the base oil 41 contained in the lubricant 27 plays a role of lubrication.

  With reference to FIG. 2, in the bearing device 1, the lubricant 27 in the lubricant reservoir 26 passes through the gap 34 between the outer ring spacer 23 and the guide member 25, and the outer peripheral surface 25 </ b> A of the guide member 25. Then, it enters into 18 and penetrates into the first contact portion 30. The lubricant 27 that has permeated the first contact portion 30 travels along the surface of the rolling element 7 and finally reaches the second contact portion 31 and the third contact portion 32. As a result, each of 30, 31, and 32 is lubricated.

  The lubricant 27 in the first contact portion 30 and the lubricant 27 in the lubricant reservoir 26 are continuous. Therefore, when the base oil 41 is consumed for lubrication in the lubricant 27 in the bearing 3, the base oil is interposed between the lubricant 27 in the first contact portion 30 and the lubricant 27 in the lubricant reservoir 26. A difference occurs in the density of 41. Then, the base oil 41 moves from the lubricant 27 of the lubricant reservoir 26 to the lubricant 27 of the first contact portion 30 so that the concentration of the base oil 41 becomes uniform. In this way, the lubricant 27 can lubricate the first contact portion 30, the second contact portion 31, and the third contact portion 32 of the bearing 3 by supplying the base oil 41 to the first contact portion 30. . Therefore, the bearing device 1 can operate without receiving a large resistance due to friction.

  However, the lubricant 27 changes over time as the bearing device 1 is used, and gradually hardens. As a result, bubbles and voids are generated in the lubricant 27 and the base oil 41 in narrow places (strictly in the radial direction R) such as the first contact portion 30 and the gap 34, and the second contact portion. The base oil 41 may not reach the 31 and the third contact portion 32. In addition, the amount of the base oil 41 that can enter the narrow portion such as the first contact portion 30 and the gap 34 is small in the first place.

FIG. 3 is a diagram comparing water absorption between the material used for the guide member 25 and other materials.
In the following, description will be given with reference to FIG. 3 in addition to FIG. 1 and FIG.
In this embodiment, therefore, the base oil 41 of the lubricant 27 is absorbed by the guide member 25 by using a resin having a liquid absorbing property as the material of the guide member 25. As the material, nylon 66 (water absorption: 8.4%) having particularly high water absorption (the same as liquid absorption and oil absorption) is used (see FIG. 3).

As described above, since the guide member 25 is in contact with the lubricant 27 of the lubricant reservoir 26 on the outer peripheral surface 25A, in this configuration, the guide member 25 is a portion in contact with the lubricant 27 of the lubricant reservoir 26. The base oil 41 of the lubricant 27 can be absorbed and stored in the guide member 25.
Here, a portion in contact with the lubricant 27 on the outer peripheral surface 25 </ b> A of the guide member 25 is referred to as a liquid absorption surface 35. The base oil 41 absorbed by the liquid absorption surface 35 moves to the bearing 3 side inside the guide member 25, and the entire guide member 25 is filled with the base oil 41. Here, in the outer peripheral surface 25 </ b> A of the guide member 25, a portion in contact with the inner peripheral surface 19 </ b> B of the annular portion 19 of the cage 8 (portion constituting the first contact portion 30) is referred to as a guide surface 33. To do. Unlike the case where the guide member 25 is made of metal, the lubricant 27 absorbed by the liquid absorption surface 35 of the guide member 25 does not flow unnecessarily along the surface of the guide member 25, and guides as needed. Since it oozes out from the guide surface 33 of the member 25, it contributes to the lubrication of the bearing 3 for a long time. Moreover, if it is the guide member 25 comprised with resin which has a liquid absorptivity, it can suppress that the bubble which becomes the obstacle of lubrication generate | occur | produces in the lubricant 27. Therefore, the base oil 41 supplied to the first contact portion 30 reaches the second contact portion 31 and the third contact portion 32. Therefore, the bearing 3 can continue to operate normally.

Thus, in the bearing device 1, since the guide member 25 made of a resin having a liquid absorption property and integrally including the guide surface 33 and the liquid absorption surface 35 is used, the bearing device is used for a long period of time. 3 lubrication can be maintained.
The cage 8 is made of resin, and more specifically, made of PEEK (polyether ether ketone). Therefore, when resin is used for the guide member 25 as in the present embodiment, the difference in expansion coefficient between the cage 8 and the guide member 25 is suppressed to be smaller than when metal is used for the guide member 25. Therefore, wear of the cage 8 due to contact between the cage 8 and the guide member 25 can be suppressed.

  Further, a plurality of air holes 36 penetrating the outer ring spacer 23 in the axial direction X are provided in the end portion 23B of the outer ring spacer 23 at equal intervals in the circumferential direction C. Each air hole 36 communicates with the lubricant reservoir 26 and is exposed to the annular space 18 side of the bearing 3 on the side opposite to the lubricant reservoir 26. Thereby, the air in the annular space 18 can enter the lubricant reservoir 26 through the air hole 36. Therefore, when the lubricant 27 is supplied from the lubricant reservoir 26 side to the bearing 3 side through the gap 34, air enters the lubricant reservoir 26 from the annular space 18 instead of the supplied lubricant 27. To do. Thereby, the lubricant 27 can smoothly pass through the gap 34 from the lubricant reservoir 26 side toward the bearing 3 side.

Next, a modification of the present invention will be described.
FIG. 4 is a diagram in which a modification of the present invention is applied to FIG. Here, the posture of each member coincides with FIG. In FIG. 4, the same members as those described above are denoted by the same reference numerals, and the description thereof is omitted.
Hereinafter, description will be made with reference to FIG. 4 in addition to FIGS.

  Referring to FIG. 4, the outer ring spacer 23 in the modification of the present invention is provided with an opening 23 </ b> G at the end 23 </ b> B on the bearing 3 side. The outer ring spacer 23 is provided with a groove 37 that is recessed from the opening 23G to the side opposite to the bearing 3 side, instead of the groove 40 (see FIG. 2) in the above-described embodiment. The groove 37 extends over the entire circumferential direction of the outer ring spacer 23. Therefore, in FIG. 4, the outer ring spacer 23 has a substantially U-shaped cross section inclined 90 ° toward the bearing 3 side. In the modification, the above-described protrusion 23C (see FIG. 2) does not exist.

  The guide member 25 is provided in the outer ring spacer 23. Specifically, the guide member 25 is inserted into the groove 37. In the guide member 25, the end portion 25C on the 3 side protrudes from the groove 37 to the bearing 3 side. The outer peripheral surface 25A of the guide member 25 is in contact with a surface 23H that partitions the groove 37 from the outside in the outer ring spacer 23. Further, the end face 25 </ b> B opposite to 3 in the guide member 25 is in contact with a face 23 </ b> I that defines the bottom of the groove 37 in the outer ring spacer 23.

On the other hand, the outer peripheral surface 25 </ b> A at the end portion 25 </ b> C of the guide member 25 enters 18 and is in contact with the inner peripheral surface 6 </ b> A in the left side portion 17 of the outer ring 6. That is, in the modification, the guide member 25 functions as an outer ring guide that supports (guides) the outer ring 6.
An inner peripheral surface 25D at the end portion 25C of the guide member 25 is in contact with an outer peripheral surface 19C at the end portion 19A of the annular portion 19 of the cage 8.

A lubricant 27 is stored in the groove 37. That is, a portion of the groove 37 other than the portion through which the guide member 25 is inserted is the lubricant reservoir 26.
In this state, the guide member 25 is in contact with the lubricant 27 of the lubricant reservoir 26 on the inner peripheral surface 25D. Therefore, the base oil 41 contained in the lubricant 27 is absorbed by the guide member 25 and moves toward the end portion 25 </ b> C through the inside of the guide member 25. Further, the base oil 41 also moves to the end portion 25C side through the inner peripheral surface 25D. Further, in the modified example, the lubricant 27 is exposed only from the end 3 </ b> B of the outer ring spacer 23 from the bearing 3 side in the axial direction X. In this state, the opening 23G functions as the air hole 36 described above.

The present invention is not limited to the embodiment described above, and various modifications can be made within the scope of the claims.
As the material of the guide member 25, it is conceivable to use the same PEEK as the material of the cage 8. In this case, when the cage 8 rotates with respect to the guide member 25, the guide member 25 and the guide member 25 are held even if the outer circumferential surface 25A of the guide member 25 and the inner circumferential surface 19B of the annular portion 19 of the cage 8 are in contact with each other. Since the vessel 8 is made of the same material, it is difficult to wear each other.

Further, the bearing device 1 does not need to be a rolling bearing device, and can be applied to a bearing device that requires the supply of the lubricant 27.
In the embodiment, the base oil 41 contained in the lubricant 27 is absorbed by the guide member 25 and is supplied to the first contact portion 30. However, the lubricant 27 includes components other than the base oil 41 in the guide member. The lubricant may be absorbed by 25 and supplied to the first contact portion 30.

  The inner ring spacer 22 is annular, but is divided into a plurality of parts in the circumferential direction C, and each part may be regarded as the inner ring spacer 22 (in the outer ring spacer 23 and the guide member 25). The same).

  DESCRIPTION OF SYMBOLS 1 ... Bearing apparatus, 3 ... Bearing, 4 ... Spacer, 5 ... Inner ring, 6 ... Outer ring, 7 ... Rolling body, 8 ... Cage, 25 ... Guide member, 26 ... Lubricant storage part, 27 ... Lubricant, 36 ... Air hole, C ... Circumferential direction

Claims (5)

An inner ring, an outer ring, a plurality of rolling elements disposed between the inner and outer rings, and a bearing having a cage that holds the plurality of rolling elements;
A spacer disposed adjacent to the bearing;
A lubricant reservoir provided in the spacer and storing a lubricant;
A resin-made guide member that is provided in the spacer, is in contact with the lubricant in the lubricant reservoir, is inserted between the inner and outer rings, and guides the cage or the outer ring,
One of the outer peripheral surface of the guide member and the inner peripheral surface of the cage, and the inner peripheral surface of the guide member and the outer peripheral surface of the cage are in contact with each other ,
The lubricant in the lubricant reservoir passes through the guide member and contacts the outer peripheral surface of the guide member and the inner peripheral surface of the cage, or the inner peripheral surface of the guide member and the cage. A bearing device configured to penetrate into a contact portion with an outer peripheral surface and to be supplied to the plurality of rolling elements through the contact portion into which the lubricant has penetrated .   The bearing device according to claim 1, wherein the resin has liquid absorbency.   The bearing device according to claim 2, wherein the resin is nylon 66.   The bearing device according to claim 1, wherein the guide member guides the cage. The spacer is formed with an air hole penetrating the spacer,
The bearing device according to any one of claims 1 to 4, wherein the air hole communicates with the lubricant reservoir and communicates with a space between the inner ring and the outer ring.

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