JP2012072851A - Lubricating device for rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubricating device for a rolling bearing capable of lubricating the rolling bearing with a small quantity of lubricating oil without using compressed air, and preventing the lowering of bearing torque.SOLUTION: An outer ring adjacent member 6 disposed adjacent to an outer ring 3 of the rolling bearing 1 is provided with a nozzle 7 inserted into a bearing space between an inner ring 2 and the outer ring 3 and facing a shoulder outer peripheral surface 2b of the inner ring 2 through a gap δ. A nozzle hole 7a for dropping the lubricating oil is formed at a surface of the nozzle 7 opposite to the shoulder outer peripheral surface 2b of the inner ring 2. A small quantity oil supply device 8 is provided to supply the lubricating oil from the outer ring adjacent member 6 to the nozzle hole 7. An air flow generating means such as a dynamic pressure groove 10 which generates an air flow from an end surface side to a rolling surface side of the rolling bearing 1 by the rotation of the inner ring 2 is provided in a space between a lubricating oil dropping surface 7b in which the nozzle hole 7a of the nozzle 7 is opened, and the shoulder outer peripheral surface 2b of the inner ring 2 facing the lubricating oil dropping surface.

Description

  The present invention relates to a rolling bearing lubrication device that supports a spindle that rotates at high speed in a machine tool such as a machining center.

Generally, in lubrication of a bearing that supports a spindle for a machine tool, it is necessary to suppress expansion due to heat generation of the bearing portion as much as possible in order to increase processing accuracy. Currently, the following methods are widely known as lubrication methods for high-speed rotary bearings of main spindles for machine tools (for example, Non-Patent Document 1).
(1) Spray lubrication (oil mist lubrication)
A method in which oil is atomized and lubricated with compressed air.
(2) Air-oil lubrication A method in which the minimum required amount of lubricating oil is measured at the optimum intervals for each bearing and is supplied with compressed air. This method has advantages such as less heat generated by oil agitation, air cooling effect, and less oil consumption.
(3) Jet lubrication This is a lubrication method in which lubricating oil is injected at a high speed from the side of the bearing, and is highly reliable under severe conditions.

  In the lubrication methods (1) and (2), a small amount of lubricating oil is continuously supplied to reduce torque and prevent heat generation. On the other hand, in the lubrication method (3), conversely, a large amount of oil is injected to cool the bearing and suppress heat generation.

  In addition, as a lubrication technique for supplying a minute amount of oil, a lubrication device using a micropump (Patent Document 1) and a lubrication device using a piezoelectric element and a diaphragm (Patent Document 2) have been proposed.

JP 2004-108388 A JP 2002-213687 A

NTN rolling bearing general catalog No. 2022 / JA-77 Nobutamune Hamada, bearing design, p81

  In the oil mist lubrication (1) and the air oil lubrication (2) described above, there is a problem that costs are required because compressed air is used. Further, in the jet lubrication of (3), since a large amount of oil is used, there is a problem that a bearing torque loss is large and a high output motor is required.

  Further, in the lubrication by the micro pump disclosed in Patent Document 1, the lubricating oil is sprayed onto the outer ring of the bearing. However, since the lubricating oil moves to the outer ring side by centrifugal force during high-speed rotation, it is actively lubricated on the inner ring side. It is necessary and not suitable for high-speed rotation. Further, in the lubrication using the piezoelectric element disclosed in Patent Document 2, the jet power of the lubricating oil is weak, the lubricating oil is repelled by the air resistance due to the rotation of the bearing at high speed rotation, and the lubricating oil does not penetrate into the bearing. There is.

  An object of the present invention is to provide a rolling bearing lubrication device that can be lubricated with a small amount of lubricating oil without using compressed air and without causing a decrease in bearing torque.

  In the rolling bearing lubrication device of the present invention, the outer ring adjacent member adjacent to the outer ring of the rolling bearing is provided with a nozzle portion that is inserted into the bearing space between the inner and outer rings and is opposed to the outer peripheral surface of the shoulder of the inner ring through a gap, A rolling bearing provided with a micro lubrication device that opens a nozzle hole for dropping lubricating oil on a surface of the nozzle portion facing the outer peripheral surface of the shoulder portion of the inner ring, and supplies the lubricating oil from the outer ring adjacent member to the nozzle hole. In this lubricating device, the end face side of the rolling bearing is caused by the rotation of the inner ring between the lubricating oil dropping surface, which is the surface where the nozzle hole of the nozzle portion is opened, and the outer peripheral surface of the shoulder portion of the inner ring facing the surface. An air flow generating means for generating an air flow from the side to the rolling surface side is provided.

  According to the lubricating device of the rolling bearing of this configuration, the lubricating oil that is supplied to the nozzle hole of the nozzle portion of the outer ring adjacent member by the micro oil supply device riding on the air flow generated by the air flow generating means is the lubricating oil of the nozzle portion. The rolling bearing is lubricated by being supplied to the inside of the rolling bearing through a gap provided between the dripping surface and the outer peripheral surface of the shoulder portion of the inner ring facing this surface. Thus, since the air flow is generated by the rotation of the rolling bearing itself, it is not necessary to use air. Therefore, the rolling bearing can be lubricated with a small amount of lubricating oil without using compressed air and without causing a decrease in bearing torque.

  In the present invention, the nozzle portion may have a bowl shape that continuously faces the entire circumference of the outer peripheral surface of the shoulder portion of the inner ring. If the nozzle portion is bowl-shaped, it is easy to cause an air flow to the rolling surface side due to the rotation of the inner ring.

  The air flow generating means may be a dynamic pressure groove formed on one or both of the lubricating oil dropping surface and the outer peripheral surface of the shoulder of the inner ring. When the dynamic pressure groove is provided, air flow from the bearing end surface side to the rolling surface side is favorably generated by the relative rotation between the lubricating oil dropping surface and the shoulder outer peripheral surface due to the rotation of the inner ring.

The dynamic pressure grooves may be a plurality of grooves arranged in the circumferential direction and inclined with respect to the axial direction. With such an inclined groove, dynamic pressure is effectively generated by rotation.
The depth of the dynamic pressure groove is preferably about the same as the gap between the nozzle portion and the outer peripheral surface of the shoulder portion of the inner ring. With such a groove depth, an air flow from the bearing end surface side to the rolling surface side is further improved.

  The outer ring adjacent member may be an outer ring spacer. The outer ring adjacent member is not necessarily limited to the outer ring spacer, but if the outer ring adjacent member is the outer ring spacer, the outer ring adjacent member can be easily installed in the housing in which the bearing is installed.

  In this invention, it is desirable that the gap between the nozzle portion and the outer peripheral surface of the shoulder portion of the inner ring is in a range of 1/100 to 1/1000 of the bearing inner ring diameter at the bearing operating temperature. The clearance up to this range is efficient in terms of air flow generation and lubricating oil supply.

  In this invention, it is good also as a taper surface which becomes large diameter toward the rolling surface side at the shoulder part outer peripheral surface of the said inner ring facing the said nozzle part. In the case of this configuration, a circumferential speed difference occurs between the bearing outer side and the bearing inner side on the shoulder outer peripheral surface, and the effect of drawing the air flow by the air flow generating means is increased by the pressure difference due to the circumferential speed difference.

In this invention, you may make the clearance gap between the said nozzle part and the outer peripheral surface of the shoulder part of the said inner ring the smallest in the opening part of the said nozzle hole in the said lubricating oil dripping surface. In this configuration, the venturi effect occurs, and the flow velocity of the air flow into the bearing inside the gap increases, so that the lubricating oil is easily separated from the nozzle hole opening on the lubricating oil dropping surface and is injected into the bearing along the air flow. Become.
For example, an annular protrusion over the entire circumference is provided at the tip of the lubricating oil dropping surface of the nozzle part, and the nozzle hole is opened in the annular protrusion, so that the nozzle part and the outer peripheral surface of the shoulder part of the inner ring Make the gap between them the smallest.

  In the present invention, an oil-repellent coating may be applied to the opening of the nozzle hole on the lubricating oil dropping surface. When the oil-repellent coating is applied, the lubricating oil is easily separated from the opening of the nozzle hole on the lubricating oil dropping surface.

  In the present invention, the micro-oil supply device may supply lubricating oil by vibrating a diaphragm constituting a wall surface of an oil chamber provided in the outer ring adjacent member with a piezoelectric element. In this configuration, by controlling the driving of the piezoelectric element, it is possible to electronically control the amount of lubricating oil to be supplied, and it is easy to control the amount of lubricating oil according to the number of rotations of the bearing. Therefore, oil is not wasted and energy loss can be minimized.

  In the present invention, the minute amount oil supply device may pump the lubricating oil from a lubricating oil storage tank provided outside the outer ring adjacent member to the outer ring adjacent member.

  In this invention, it is desirable that the tip of the nozzle portion be positioned closer to the bearing center than the end face of the rolling bearing retainer facing the outer ring adjacent member. Thus, by disposing the tip of the nozzle portion closer to the bearing center than the end face of the cage, it can be expected that the repelled lubricating oil will contact at least the cage and the lubricating oil will accumulate inside the bearing.

  In this invention, you may provide a groove | channel in the internal diameter surface of the holder | retainer of a rolling bearing. Providing a groove on the inner diameter surface of the cage makes it easier for lubricating oil to flow into the pocket side of the cage.

  In this invention, it is desirable to make the inner diameter dimension of the end portion side of the cage of the rolling bearing smaller than the inner diameter dimension of the axial portion having the pocket. In the case of this configuration, the outflow of lubricating oil from the cage can be prevented.

  In the present invention, the rolling bearing may be an angular ball bearing, and the outer peripheral surface of the shoulder portion on the front side of the inner ring may be a tapered surface having a large diameter on the rolling surface side, and the nozzle portion may be opposed to the tapered surface. In the case of an angular ball bearing, since the front side of the inner ring is generally a tapered surface, this tapered surface can be used to increase the efficiency of air flow generation due to the peripheral speed difference caused by the taper. Note that the front side of the inner ring is the front side when referring to the front and the back with respect to the inner ring, and when referring to the bearing, the outer ring is used as a reference, and thus is the back side of the bearing.

The rolling bearing of the present invention is characterized in that it is lubricated by the rolling bearing lubrication device of the present invention. The rolling bearing in this case is, for example, an angular ball bearing.
Lubrication with the rolling bearing lubrication device of the present invention enables lubrication with a small amount of lubricating oil without using compressed air and without causing a decrease in bearing torque.

The spindle device of the present invention is a spindle device that supports a main shaft of a machine tool, and is characterized in that the main shaft is supported using the rolling bearing lubrication device of the present invention.
According to this configuration, since the main shaft is supported by the rolling bearing lubrication device and the rolling bearing of the invention, the rolling bearing is lubricated by a small amount of lubricating oil without using compressed air and causing a decrease in bearing torque. Thus, the driving torque of the main shaft can be reduced, and the speed can be increased and the temperature rise can be reduced.

In the rolling bearing lubrication device of the present invention, the outer ring adjacent member adjacent to the outer ring of the rolling bearing is provided with a nozzle portion that is inserted into the bearing space between the inner and outer rings and is opposed to the outer peripheral surface of the shoulder of the inner ring through a gap, A rolling bearing provided with a micro lubrication device that opens a nozzle hole for dropping lubricating oil on a surface of the nozzle portion facing the outer peripheral surface of the shoulder portion of the inner ring, and supplies the lubricating oil from the outer ring adjacent member to the nozzle hole. In this lubricating device, the end face side of the rolling bearing is caused by the rotation of the inner ring between the lubricating oil dropping surface, which is the surface where the nozzle hole of the nozzle portion is opened, and the outer peripheral surface of the shoulder portion of the inner ring facing the surface. Therefore, the rolling bearing can be lubricated with a small amount of lubricating oil without using compressed air and without causing a decrease in bearing torque.
Since the rolling bearing of the present invention is lubricated by the rolling bearing lubrication device of the present invention, it can be lubricated with a small amount of lubricating oil without using compressed air and without causing a decrease in bearing torque.
The spindle device according to the present invention is a spindle device that supports a main shaft of a machine tool, and the bearing device supports the main shaft by using the rolling bearing lubrication device and the rolling bearing according to the present invention. The rolling bearing can be lubricated with a small amount of lubricating oil without lowering the torque, the driving torque of the main shaft can be reduced, and the speed can be increased and the temperature rise can be reduced.

(A) is sectional drawing of the lubricating device of the rolling bearing concerning one Embodiment of this invention, (B) is a fragmentary top view of the inner ring | wheel of the rolling bearing in (A). It is sectional drawing of the lubricating device of the rolling bearing concerning one Embodiment of this invention. It is sectional drawing of an example of the trace amount oil supply apparatus using a piezoelectric element. It is a block diagram of the spindle apparatus provided with the lubricating device of FIG.

A first embodiment of the present invention will be described with reference to FIG. FIG. 1A shows a cross-sectional view of a rolling bearing lubrication device of this embodiment. In this rolling bearing lubrication device, a small amount of lubricating oil is dropped from the nozzle portion 7 of the adjacent member 6 of the outer ring, and the lubricating oil is introduced from the end surface side of the rolling bearing 1 to the rolling surface 2a side by airflow. The rolling bearing 1 is lubricated. The rolling bearing 1 supports, for example, a main shaft of a machine tool.
The rolling bearing 1 is formed of an angular ball bearing, and a plurality of rolling elements 4 are interposed between the rolling surfaces 2 a and 3 a of the inner ring 2 and the outer ring 3. The rolling element 4 is formed of a ball and is held by a cage 5.

  The outer ring adjacent member 6 includes an outer ring spacer disposed adjacent to the outer ring 3 of the rolling bearing 1. The outer ring adjacent member 6 is provided with a nozzle portion 7 which is inserted into the bearing space between the inner and outer rings 2 and 3 of the rolling bearing 1 and faces the outer peripheral surface 2b of the inner ring 2 via a gap δ. The nozzle portion 7 has a bowl shape that continuously faces the entire circumference of the shoulder portion outer peripheral surface 2 b of the inner ring 2. A nozzle hole 7a for dropping the lubricating oil is formed on the surface of the nozzle portion 7 that faces the outer peripheral surface 2b of the shoulder portion of the inner ring 2. The inner space 6a, which is a space provided inside the outer ring adjacent member 6, is provided with a small amount of oil supply device 8 for supplying a small amount of lubricating oil from the outer ring adjacent member 6 to the nozzle hole 7a, thereby opening the inner space 6a. The end side is closed with a lid member 9.

  For example, as shown in FIG. 3, the micro-oil supply device 8 supplies a lubricating oil by vibrating a diaphragm 32 that constitutes a wall surface of an oil chamber 31 serving as a lubricating oil pool by a piezoelectric element 33. That is, by applying a predetermined voltage to the piezoelectric element 33 brought into contact with the diaphragm 32 and pushing the diaphragm 32, the lubricating oil is pushed out to the nozzle hole 7a. In this case, by adjusting the voltage applied to the piezoelectric element 33, it is possible to control the pressure applied to the diaphragm 32 and adjust the supply amount of the lubricating oil. Note that a check valve (not shown) may be provided at the inlet of the oil chamber 31.

  Lubricating oil is pumped to the minute amount oil supply device 8 from an external lubricating oil storage tank 11 in which lubricating oil is stored through an oil introduction path 12 by air pressure or spring force. In this case, the minute amount oil supply device 8 is not limited to the one using the above-described piezoelectric element, but may be an oil amount control mechanism that serves as a throttle passage or the like using a needle valve. The oil introduction path 12 includes an introduction path portion 12 a provided in the housing 13 to which the outer ring adjacent member 6 and the outer ring 3 of the rolling bearing 1 are attached, and an introduction path portion 12 b provided in the outer ring adjacent member 6.

  On the outer peripheral surface 2b of the shoulder portion of the inner ring 2 facing the nozzle portion 7 of the rolling bearing 1, as shown in the partial plan view of the inner ring 2 in FIG. 1 (B), from the end surface side of the inner ring 3 to the rolling surface 2a. A plurality of dynamic pressure grooves 10 (shown with hatching) extending in parallel with each other are formed in parallel with each other over the entire circumference. Each dynamic pressure groove 10 is a groove inclined with respect to the axial direction. The dynamic pressure groove 10 is formed by the rotation of the inner ring 2 between the lubricating oil dropping surface 7b, which is the surface of the nozzle unit 7 where the nozzle hole 7a is opened, and the shoulder outer peripheral surface 2b of the inner ring 2 facing this surface. This is air flow generating means for generating an air flow from the end face side of the rolling bearing 1 to the rolling face 2a side. The depth of the dynamic pressure groove 10 is approximately the same as the gap δ between the nozzle portion 7 and the outer peripheral surface 2b of the shoulder portion of the inner ring 2. The dynamic pressure groove 10 may be formed on the lubricating oil dropping surface 7b of the nozzle portion 7, or may be formed on both the shoulder outer peripheral surface 2b of the inner ring 2 and the lubricating oil dropping surface 7b.

Selection of the gap δ between the nozzle portion 7 and the outer peripheral surface 2b of the shoulder portion of the inner ring 2 and the depth of the dynamic pressure groove 10 are performed as follows, as in the case of the design of the dynamic pressure bearing.
Generally, in order to maximize the dynamic pressure effect, it is desirable that both the gap δ and the groove depth of the dynamic pressure groove 10 be about 1/100 to 1/1000 of the diameter of the inner ring 2. (Non-Patent Document 2). Considering the expansion of the bearing, the clearance δ is designed to have the above value at the most frequently used bearing temperature. However, even if the expansion due to the temperature rise of the bearing is taken into consideration, the clearance δ must be such that the outer peripheral surface 2b of the inner ring 2 and the nozzle portion 7 do not contact each other. For example, when the diameter of the inner ring 2 of the rolling bearing 1 is 80 mm and the temperature rise is about 30 ° C., a diameter gap of 200 to 300 μm is required at room temperature.

  The outer peripheral surface 2b of the shoulder portion of the inner ring 2 facing the nozzle portion 7 is a tapered surface having a large diameter toward the rolling surface 2a. As a result, a circumferential speed difference occurs between the bearing outer side and the bearing inner side on the shoulder outer peripheral surface 2b, and the effect of drawing the air flow in the dynamic pressure groove 10 as the air flow generating means by the pressure difference due to the circumferential speed difference is increased. become.

In addition, the gap δ between the nozzle portion 7 and the outer peripheral surface 2b of the shoulder portion of the inner ring 2 is minimized at the opening portion of the nozzle hole 7a in the lubricating oil dropping surface 7b of the nozzle portion 7. Specifically, an annular protrusion 7c is provided on the tip 7b of the lubricating oil dropping surface of the nozzle 7 over the entire circumference, and a nozzle hole 7a is opened in the annular protrusion 7c, so that the nozzle 7 and the inner ring 2 are opened. The gap between the outer peripheral surface 2b of the shoulder portion is the smallest at the nozzle opening. As a result, a venturi effect is generated, and the flow velocity of the air flow toward the bearing inner side in the gap δ increases, so that the lubricating oil is separated from the opening of the nozzle hole 7a in the lubricating oil dropping surface 7b and is injected into the bearing along the air flow. It becomes easy.
The annular protrusion 7c may be eliminated, and the lubricating oil dropping surface 7b of the nozzle portion 7 may be a uniform tapered surface as shown in FIG.

  For example, PTFE (polytetrafluoroethylene) -based oil-repellent coating is applied to the opening of the nozzle hole 7a in the lubricating oil dropping surface 7b of the nozzle part 7, and the lubricating oil is supplied from the opening of the nozzle hole 7a in the lubricating oil dropping surface 7b. Is easy to leave.

  The tip of the nozzle portion 7 is located closer to the bearing center than the end face of the roller bearing 1 facing the outer ring adjacent member 6 of the cage 5. In this way, by disposing the tip of the nozzle portion 7 closer to the bearing center than the end face of the cage 5, the repelled lubricating oil comes into contact with at least the cage 5 and the lubricating oil accumulates inside the bearing. I can expect.

  A groove 5 a is provided on the inner diameter surface of the cage 5 so that the lubricating oil easily flows into the pocket 5 b side of the cage 5. Further, the inner diameter dimension of the end portion side of the cage 5 is made smaller than the inner diameter dimension of the pocket 5b side to prevent the lubricating oil from flowing out from the cage 5. In this figure, the groove is rectangular, but it may be, for example, a tapered shape that expands toward the center.

  According to the rolling bearing lubrication device having the above-described configuration, the outer ring adjacent member 6 is mounted on the air flow generated by the air flow generating means dynamic pressure groove 10 on the outer peripheral surface 2b of the inner ring 2 of the rolling bearing 1 by the micro oil supply device 8. The lubricating oil supplied to the nozzle hole 7a of the nozzle portion 7 rolls from a gap δ provided between the lubricating oil dropping surface 7b of the nozzle portion 7 and the shoulder outer peripheral surface 2b of the inner ring 2 facing this surface. It is supplied to the inside of the bearing 1 and the rolling bearing 1 is lubricated. Thus, since the air flow is generated by the rotation of the rolling bearing 1 itself, it is not necessary to use air. Therefore, the rolling bearing 1 can be lubricated with a small amount of lubricating oil without using compressed air and without causing a decrease in bearing torque.

  In this embodiment, the angular ball bearing for the main spindle of a machine tool that requires particularly low torque and low heat generation has been exemplified as the rolling bearing 1 to be lubricated. The same can be applied to a rolling bearing.

  FIG. 4 shows an example of a spindle device provided with the rolling bearing lubrication device. This spindle device is provided in a machine tool, and a work or tool chuck is attached to one end of a main shaft 15. The main shaft 15 is supported by a plurality of rolling bearings 1 separated in the axial direction, and the lubricating device shown in FIG. The inner ring 2 of each rolling bearing 1 is fitted to the outer diameter surface of the main shaft 15, and the outer ring 3 is fitted to the inner diameter surface of the housing 13. These inner and outer rings 2 and 3 are fixed in the housing 13 by an inner ring presser 25 and an outer ring presser 26. The housing 13 has a double structure of an inner peripheral housing 13A and an outer peripheral housing 13B, and a cooling oil passage 16 is formed between the inner and outer housings 13A and 13B. The inner peripheral housing 13A is provided with an introduction path portion 12a of the oil introduction path 12 in FIG. Further, the housing 13 is provided with a lubricating oil discharge groove 22 in the vicinity of the installation portion of the rolling bearing 1 on the inner diameter surface, and a lubricating oil discharge channel 23 opened to the outside from the lubricating oil discharge groove 22 is provided. It is done. A lubricating oil storage tank 11 communicating with the oil introduction path 12 is provided outside, and the lubricating oil is pressure-fed through the oil introduction path 12 to the minute amount oil supply device 8 of FIG.

  In the spindle device configured as described above, since the rolling bearing lubrication device described above is incorporated, the rolling bearing 1 is lubricated with a small amount of lubricating oil without using compressed air and causing a decrease in bearing torque. The driving torque of the main shaft 15 can be reduced, and the speed can be increased and the temperature rise can be reduced.

DESCRIPTION OF SYMBOLS 1 ... Rolling bearing 2 ... Inner ring 2a ... Inner ring rolling surface 2b ... Shoulder outer peripheral surface 3 ... Outer ring 3a ... Outer ring rolling surface 4 ... Rolling element 5 ... Cage 5a ... Groove 6 ... Outer ring adjacent member 6a ... Inner space 7 ... Nozzle part 7a ... Nozzle hole 7b ... Lubricating oil dropping surface 7c ... Annular protrusion 8 ... Trace oil supply device 9 ... Lid member 10 ... Dynamic pressure groove (air flow generating means)
δ ... Clearance 11 ... Lubricating oil storage tank 12 ... Oil introduction path 12a ... Housing side oil introduction path 12b ... Outer ring adjacent member side oil introduction path 13 ... Housing 13A ... Inner peripheral housing 13B ... Outer peripheral housing 15 ... Main shaft 16 ... Cooling Oil flow path 22 ... Lubricating oil discharge groove 23 ... Lubricating oil discharge flow path 25 ... Inner ring retainer 26 ... Outer ring retainer 31 ... Oil chamber 32 ... Diaphragm 33 ... Piezoelectric element

Claims (20)

The outer ring adjacent member adjacent to the outer ring of the rolling bearing is provided with a nozzle portion that is inserted into the bearing space between the inner and outer rings and faces the outer peripheral surface of the inner ring through a gap, and the outer periphery of the shoulder portion of the inner ring of the nozzle portion In a lubricating device for a rolling bearing provided with a minute amount oil supply device that opens a nozzle hole for dropping lubricating oil on a surface facing the surface and supplies lubricating oil to the nozzle hole from the outer ring adjacent member,
A rolling surface side from an end surface side of the rolling bearing by rotation of the inner ring between a lubricating oil dropping surface which is a surface where the nozzle hole of the nozzle portion is opened and a shoulder outer peripheral surface of the inner ring facing the surface. An air flow generating means for generating an air flow to the roller bearing is provided.   2. The lubricating device for a rolling bearing according to claim 1, wherein the nozzle portion has a bowl-like shape that continuously faces the entire circumference of the outer peripheral surface of the shoulder portion of the inner ring.   3. The rolling bearing according to claim 2, wherein the air flow generating means is a dynamic pressure groove formed on one or both of the lubricating oil dropping surface of the nozzle portion and the outer peripheral surface of the shoulder portion of the inner ring. Lubrication equipment.   4. The rolling bearing lubrication device according to claim 3, wherein a plurality of the dynamic pressure grooves are arranged in the circumferential direction and are inclined with respect to the axial direction.   The rolling bearing lubrication device according to claim 3 or 4, wherein a depth of the dynamic pressure groove is substantially the same as a gap between the nozzle portion and an outer peripheral surface of a shoulder portion of the inner ring.   The rolling bearing lubrication device according to any one of claims 3 to 5, wherein the outer ring adjacent member is an outer ring spacer.   7. The gap between the nozzle portion and the outer peripheral surface of the shoulder portion of the inner ring according to claim 3, wherein the gap between the outer peripheral surface of the inner ring and the inner ring has a range of 1/100 to 1/1000 of the bearing inner ring diameter at the bearing operating temperature. Is a rolling bearing lubrication device.   The rolling bearing lubrication device according to any one of claims 3 to 7, wherein an outer peripheral surface of a shoulder portion of the inner ring facing the nozzle portion is a tapered surface having a large diameter toward the rolling surface side.   9. The gap between the nozzle portion and the outer peripheral surface of the shoulder portion of the inner ring at a portion where the nozzle hole is opened in the lubricating oil dropping surface of the nozzle portion according to claim 3. The smallest rolling bearing lubrication system.     10. The lubricating device for a rolling bearing according to claim 9, wherein an annular protrusion is provided at the tip of the nozzle portion on the surface of the lubricating oil dropping surface, and the nozzle hole is opened in the annular protrusion.   The rolling bearing lubrication device according to any one of claims 3 to 10, wherein an oil-repellent coating is applied to an opening of the nozzle hole on the lubricating oil dropping surface.   12. The micro oil supply device according to claim 3, wherein the micro oil supply device supplies lubricating oil by vibrating a diaphragm constituting a wall surface of an oil chamber provided in the outer ring adjacent member with a piezoelectric element. Is a rolling bearing lubrication device.   The rolling bearing according to any one of claims 3 to 10, wherein the micro oil supply device is configured to pump the lubricating oil from a lubricating oil storage tank provided outside the outer ring adjacent member to the outer ring adjacent member. Lubrication device.   14. The rolling bearing lubrication device according to claim 1, wherein a tip of the nozzle portion is positioned closer to a bearing center side than an end face of the rolling bearing retainer facing the outer ring adjacent member.   The rolling bearing lubrication device according to any one of claims 3 to 12, wherein a groove is provided in an inner diameter surface of a cage of the rolling bearing.   The rolling bearing lubrication device according to any one of claims 3 to 15, wherein the inner diameter dimension of the end portion side of the cage of the rolling bearing is smaller than the inner diameter dimension of the axial portion having the pocket.   The rolling bearing according to any one of claims 3 to 16, wherein the rolling bearing is an angular ball bearing, and the shoulder outer peripheral surface on the front side of the inner ring is a tapered surface having a large diameter on the rolling surface side. A lubricating device for a rolling bearing facing the nozzle portion.   A rolling bearing characterized by being lubricated by the rolling bearing lubrication device according to any one of claims 1 to 17.   The rolling bearing according to claim 18, wherein the rolling bearing is an angular ball bearing.   A spindle device for supporting a main shaft of a machine tool, wherein the main shaft is supported using a rolling bearing provided with the rolling bearing lubrication device according to any one of claims 3 to 17. Spindle device.

Images