JP2010144889A - Rolling bearing provided with grease sump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing equipped with a grease sump of grease-sump formation parts wherein foreign matters and a coolant are prevented from invading in the rolling bearing from the side which is equipped with the grease-sump formation parts. <P>SOLUTION: The rolling bearing includes a rolling bearing 6 having an inner ring 1, an outer ring 2, and a plurality of rolling elements 3; an annular grease-sump formation 7 placed adjacently to a fixed-side race-ring of the rolling bearing 6; and a rotation-side spacer 8 provided adjacently to a rotation-side race-ring, where the fixed-side race-ring is taken as an outer ring 2, and the rotation-side race-ring is taken as an inner ring 1. The inside of the grease-sump formation 7 is formed as a grease sump 10; following the grease-sump 10, an oil discharge port 14 is provided which is opened in the vicinity of the race-way face 2a of the outer ring 2 to discharge grease or its base oil collected in the grease-sump 10. The rolling bearing is provided further with a sealing means 21 which prevents invasion of extraneous matters into the rolling bearing 6 from an annular space 20 between the grease-sump formation 7 and the rotation-side spacer 8. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing with a grease reservoir which is mainly used for supporting a shaft rotating at a high speed such as a machine tool main shaft and is lubricated with grease.

  As a lubrication method of the machine tool main shaft bearing, there are mainly air-oil lubrication in which lubricating oil is mixed with conveyance air and the oil is injected from a nozzle, and grease lubrication that can be used without maintenance. Air oil lubrication has a problem from the viewpoints of cost, energy saving, resource saving, noise, and the like because it requires an air oil supply device as ancillary equipment and requires air. There is also a problem of deteriorating the environment due to the scattering of oil. In order to solve these problems, in recent years, attempts to increase the speed and extend the life by grease lubrication have begun to attract attention, and demands have increased.

One method of grease lubrication is disclosed in Patent Document 1, for example. In this grease lubrication, a grease reservoir forming part having a grease reservoir formed therein is provided adjacent to the outer ring which is a fixed side raceway, and the base oil in the grease sealed in the grease reservoir is formed by the grease reservoir generated by the operation. The grease is discharged from the grease reservoir due to the temperature difference between the inside and outside and is supplied to the raceway surface of the inner and outer rings.
JP 2007-182917 A

  In the grease lubrication system, in order to prevent the grease from leaking to the outside from the bearing space between the inner and outer rings, the end on the side where the grease reservoir forming part is not provided is sealed with a seal. However, the grease pool forming component itself is used as a substitute for the seal at the end on the side where the grease pool forming component is provided. Prevents grease leakage. Although this structure can prevent leakage of grease from the bearing space, there is a concern that foreign matters such as dust and coolant may enter the bearing space from the side where the grease reservoir forming part without seal is not provided.

  An object of the present invention is a rolling bearing with a grease reservoir having a grease reservoir forming part having a grease reservoir for grease lubrication. Foreign matter and coolant enter the rolling bearing from the side where the grease reservoir forming part is provided. Is to prevent that.

  A rolling bearing with a grease reservoir according to the present invention includes a rolling bearing having an inner ring, an outer ring, and a plurality of rolling elements interposed between the raceway surfaces of the inner and outer rings, and an inner ring and an outer ring that are race rings with respect to the rolling bearing. Among them, an annular grease reservoir forming component disposed adjacent to a non-rotating fixed raceway ring, and a rotating side spacer disposed adjacent to a rotating rotary raceway ring, wherein the grease reservoir forming component is The interior is formed as a grease reservoir, and has an oil discharge port that opens in the vicinity of the raceway surface of the stationary bearing ring and discharges the grease in the grease reservoir or its base oil. Sealing means for preventing foreign matter and the like from entering the rolling bearing from an annular gap between the pool forming component and the rotating side spacer is provided.

  The rolling bearing with a grease reservoir having this configuration is used by filling the grease reservoir with grease. A temperature change occurs due to the heat cycle in the grease reservoir accompanying the operation and stop of the rolling bearing, and the base oil separated from the grease in the grease reservoir is discharged from the oil discharge port and supplied to the raceway surface of the stationary bearing ring. The The grease supplied to the raceway surface of the stationary side raceway is also supplied to the raceway surface of the rotation side raceway via the rolling elements. As a result, only the grease enclosed in the bearing can be used to achieve high speed, long life, and maintenance-free.

  In addition, by providing a sealing means to prevent foreign matter from entering the rolling bearing through the annular gap between the grease reservoir forming component and the rotating side spacer, the grease in the rolling bearing is deteriorated and the bearing ring Biting of foreign matter into the raceway surface can be reduced. As a result, a long-term supply of the lubricant to the bearing can be expected, and the life can be further extended. The sealing means may be a contact type sealing member that closes the annular gap, or may be a labyrinth seal.

  When the sealing means is a contact type sealing member, the sealing member can be provided by being fitted to the grease reservoir forming component. Further, in the case of having a fixed side spacer that is located on the opposite side of the rotational side spacer in the radial direction with respect to the grease reservoir forming component and is disposed adjacent to the fixed side raceway, It can be provided by being fitted to the fixed side spacer. In either case, the seal member can be easily provided.

When the labyrinth seal as the sealing means has a fixed side spacer that is located on the opposite side in the radial direction of the rotating side spacer with respect to the grease reservoir forming component and is arranged adjacent to the fixed side raceway ring, A portion of the fixed side spacer that protrudes in the axial direction opposite to the rolling bearing rather than the grease reservoir forming component extends to the vicinity of the rotary side spacer, and the rotation side spacer and the fixed side spacer It can be configured by narrowing the gap between the spacers. In that case, a stepped portion that is separated from the fixed side spacer is provided on the peripheral surface of the rotating side spacer that faces the fixed side spacer, and the peripheral surface that continues from the stepped portion to the opposite side in the axial direction with respect to the rolling bearing is fixed. It is desirable to use an inclined surface inclined toward the side spacer.
By providing a stepped part away from the fixed side spacer on the circumferential surface facing the fixed side spacer of the rotation side spacer, the path between the rotation side spacer and the fixed side spacer has a bent path. can do. Furthermore, the peripheral surface extending from the step portion to the opposite side in the axial direction with respect to the rolling bearing is an inclined surface inclined toward the fixed spacer, so that foreign matter or the like existing between the spacer gaps can be turned into the rolling bearing by centrifugal force. On the other hand, the effect of scattering to the opposite side in the axial direction occurs. By these, the effect which prevents that a foreign material and a coolant penetrate | invade in a rolling bearing is heightened.

The labyrinth seal as the sealing means can also be configured by narrowing an annular gap between the grease reservoir forming component and the rotation side spacer. In that case, a taper groove having an inclined surface inclined toward the grease reservoir forming component as it goes to the opposite side in the axial direction with respect to the rolling bearing on the peripheral surface of the rotating side spacer facing the grease reservoir forming component. It is desirable to provide it.
When the taper groove is provided, the inclined surface of the taper groove causes the foreign matter existing in the annular gap between the grease reservoir forming part and the rotating side spacer to scatter to the opposite side in the axial direction with respect to the rolling bearing by centrifugal force. Occurs. Thereby, the effect which prevents that a foreign material and a coolant penetrate | invade in a rolling bearing is heightened.

Instead of providing the tapered groove on the circumferential surface of the rotating side spacer, the rotating side spacer has a protruding portion that protrudes in the axially opposite side with respect to the rolling bearing rather than the grease pool forming component. In addition, a flange having an inclined surface that is inclined toward the fixed side spacer as it goes to the opposite side in the axial direction with respect to the rolling bearing may be provided on the protrusion.
In this case, the inclined surface of the flange causes the foreign matter to be scattered by the centrifugal force to the axial direction opposite to the rolling bearing. It becomes difficult to invade.

Further, a taper groove having an inclined surface inclined toward the grease reservoir forming component as it goes to the opposite side in the axial direction with respect to the rolling bearing is provided on the peripheral surface of the rotating side spacer facing the grease reservoir forming component. The rotating side spacer has a protruding portion that protrudes on the opposite side in the axial direction with respect to the rolling bearing relative to the grease reservoir forming component, and the protruding portion goes to the opposite side in the axial direction with respect to the rolling bearing. A flange having an inclined surface inclined toward the fixed side spacer may be provided.
In this case, the effect of the tapered groove and the effect of the flange can be obtained synergistically, so that the effect of preventing foreign matter and coolant from entering the rolling bearing is further enhanced.

  In the present invention, for example, the rotation-side raceway can be an inner race and the fixed-side raceway can be an outer race. The reverse may be possible.

  The rolling bearing with a grease reservoir according to the present invention can be suitably used for supporting the machine tool main shaft because the above-described effects are obtained.

  A rolling bearing with a grease reservoir according to the present invention includes a rolling bearing having an inner ring, an outer ring, and a plurality of rolling elements interposed between the raceway surfaces of the inner and outer rings, and an inner ring and an outer ring that are race rings with respect to the rolling bearing. Among them, an annular grease reservoir forming component disposed adjacent to a non-rotating fixed raceway ring, and a rotating side spacer disposed adjacent to a rotating rotary raceway ring, wherein the grease reservoir forming component is The interior is formed as a grease reservoir, and has an oil discharge port that opens in the vicinity of the raceway surface of the stationary bearing ring and discharges the grease in the grease reservoir or its base oil. Since the sealing means for preventing foreign matter and the like from entering the rolling bearing from the annular gap between the reservoir forming component and the rotating side spacer is provided, the grease reservoir forming component Foreign material or coolant from provided side can be prevented from entering into the rolling bearing.

  An embodiment of the present invention will be described with reference to FIGS. In FIG. 1, this rolling bearing with a grease reservoir includes a rolling bearing 6 having an inner ring 1, an outer ring 2, and a plurality of rolling elements 3 interposed between raceway surfaces 1 a and 2 a of the inner and outer rings 1 and 2, and the rolling bearing. 6, a grease reservoir forming component 7 disposed adjacent to the outer ring 2, an inner ring positioning spacer 8, and an outer ring positioning spacer 9. The plurality of rolling elements 3 are held by a cage 4. One end of the bearing space between the inner and outer rings 1 and 2 is sealed by a seal member 5 made of an oil seal.

  The rolling bearing 6 is an angular ball bearing, the grease reservoir forming component 7 is provided on the front side of the bearing, and the seal member 5 is provided on the back side of the bearing. The inner ring positioning spacer 8 and the outer ring positioning spacer 9 are both provided on the bearing front side. The inner ring 1 is fitted to a main shaft (not shown) to be rotatable, and the outer ring 2 is fixedly supported in a fitted state on the inner periphery of a housing (not shown) in the spindle unit. In the figure, the crossed hatched portions indicate portions filled with grease.

The shoulder 1b on the front side of the inner ring 1 serving as the rotation side raceway is shaped to recede from the front side end surfaces of the inner and outer rings 1 and 2 in order to avoid interference with the main body 7a of the grease reservoir forming part 7. .
On the outer ring 2 that is a fixed-side raceway, the step surface 2b that follows the raceway surface 2a is an edge on the front side of the outer ring that is separated from the rolling element 3, that is, the edge opposite to the axial direction with respect to the direction in which the contact angle occurs on the raceway surface 2a Followed by. The step surface 2b is a surface that extends from the raceway surface 2a to the outer diameter side and faces the outer ring front side. An inner peripheral surface portion 2c continuing from the step surface 2b to the outer ring front side is a cylindrical surface.

The inner ring positioning spacer 8 is a rotation side spacer and is provided in contact with the front end face of the inner ring 1. The outer peripheral surface of the inner ring positioning spacer 8 is opposed to the inner peripheral surface of the main body portion 7 a of the grease reservoir forming component 7 through an annular gap 20.
The outer ring positioning spacer 9 is a fixed spacer and is provided in contact with the front end face of the outer ring 2. The end faces 2d and 9a that are the mating surfaces of the outer ring 2 and the outer ring positioning spacer 9 are both the same diameter at the outer diameter edge, and the outer ring positioning spacer 9 is smaller in diameter than the outer ring 2 at the inner diameter edge.

  The grease reservoir forming component 7 is an annular component, and has a main body portion 7a having a grease reservoir 10 formed therein, and a flow extending from the main body portion 7a toward the stepped portion 2b and communicating with the grease reservoir 10 therein. It consists of a hollow gap-forming piece 7b in which a path 11 is formed. The grease reservoir 10 is opened only by the flow path 11 and the others are sealed. The flow path 11 has a minimum width portion 11a having the smallest radial width on the front end side, and the front end is open. The main body portion 7 a is fitted to the inner circumference of the outer ring positioning spacer 9, and the gap forming piece 7 b is fitted to the inner circumferential surface portion 2 c of the outer ring 2. In this embodiment, the grease reservoir forming component 7 is an integral part, but may be configured such that a member on the inner diameter side and a member on the outer diameter side are joined. The grease reservoir forming component 7 is made of, for example, a synthetic resin.

  In the assembled state, the stepped portion 12 at the boundary between the main body portion 7 a and the gap forming piece 7 b on the outer peripheral surface of the grease reservoir forming component 7 abuts on the end surface 9 a serving as the mating surface of the outer ring positioning spacer 9. The axial position of the forming part 7 is positioned. In other words, the gap forming piece 7b is sandwiched between the end surface 9a of the outer ring positioning spacer 9 and the step surface 2b of the outer ring 2. In this assembled state, an oil discharge gap serving as an oil discharge port is formed between the step surface 2b of the outer ring 2 and the tip surface 13 of the gap forming piece 7b. Facing the oil discharge gap, the minimum width portion 11a of the flow path 11 is opened.

  Comparing the inner and outer annular wall portions 7ba, 7bb constituting the gap forming piece 7b, the tip end of the non-race ring side annular wall portion 7ba is protruded toward the step surface 2b side than the race ring side annular wall portion 7bb. It is. In other words, of the front end surface 13 of the gap forming piece 7b, the front end surface 13a of the non-race ring side annular wall portion 7ba is closer to the step surface 2b than the front end surface 13b of the race ring side annular wall portion 7bb. Yes. And the convex part 15 which the front-end | tip contact | abutted the level | step difference surface 2b in the assembly state is provided in the circumferential direction several places (FIG. 2) of the front end surface 13a of the non-race ring side annular wall part 7ba. That is, the oil discharge gap 14 is substantially between the portion where the convex portion 15 of the tip surface 13a does not exist and the step surface 2b. The protrusion amount of the convex portion 15 is set so that the gap amount δ of the oil discharge gap 14 is, for example, 0.05 to 0.1 mm.

  The rolling bearing with the grease reservoir has sealing means for preventing foreign matter and the like from entering the rolling bearing 6 from the annular gap 20 between the grease reservoir forming component 7 and the inner ring positioning spacer 8 which is the rotating side spacer. Is provided. In the case of this embodiment, the sealing means is a contact-type seal member 21 that closes the annular gap 20, and the seal member 21 is made of an oil seal, for example. The illustrated seal member 21 is a springless outer peripheral rubber type oil seal, is provided by being fitted to the inner periphery of the outer ring positioning spacer 9, and the lip 21 a is in contact with the outer periphery of the inner ring positioning spacer 8. The direction of the lip 21a is outward with respect to the bearing space. Specifically, the seal member 21 is fitted to the enlarged diameter portion 9b formed on the inner peripheral surface of the outer ring positioning spacer 9 so that the seal member 21 does not enter the rolling bearing 6 side. Thus, the seal member 21 can be easily provided by fitting the seal member 21 to the inner periphery of the outer ring positioning spacer 9.

The operation of this configuration will be described. Grease is sealed in the rolling bearing 6 for initial lubrication. When the bearing is rotated, a temperature change occurs in the bearing due to starting and stopping during operation, and the base oil is separated from the grease in the grease reservoir 10. At the same time, the temperature inside the grease reservoir 10 in a sealed state increases. Due to this temperature rise, the separated base oil passes through the flow path 11 and is discharged into the bearing space from the oil discharge gap 14 which is an oil discharge port. The discharged base oil is supplied to the raceway surface 2 a of the outer ring 2. When the temperature rises to a steady state, the internal temperature gradually decreases in parallel with the base oil discharge, and the base oil discharge amount per unit time also decreases. Thereafter, when the operation is stopped, the temperature of the grease reservoir 10 also decreases. At this time, there is no discharge of base oil due to temperature rise, and the oil discharge gap 14 is filled with base oil. Therefore, the grease reservoir 10 is in a sealed state in the operation stop state.
Thereafter, when the operation is resumed, the temperature change of the grease reservoir 10 occurs again. Due to such a temperature increase and decrease heat cycle, temperature fluctuations in the grease reservoir 10 are repeated, and the base oil separated from the grease is reliably discharged from the oil discharge gap 14 and repeatedly on the raceway surface 2a of the outer ring 2. Supplied.

  In addition to the base oil discharging action by the heat cycle, a base oil discharging action by the capillary action shown below is also added. That is, when the bearing is stopped, due to the thickener in the grease and the capillary phenomenon of the oil discharge gap 14, the base oil of the grease moves from the flow path 11 to the oil discharge gap 14, and this capillary phenomenon and the oil surface. Combined with the tension, the base oil is held in oil in the oil discharge gap 14. When the bearing is operated, the base oil stored in the oil discharge gap 14 flows out of the oil discharge gap 14 due to the temperature rise of the outer ring 2 generated by the operation and the air flow generated by the revolution and rotation of the rolling element 3. Thus, it moves while adhering to the raceway surface 2a of the outer ring 2 and is continuously supplied to the rolling element contact portion.

  As described above, in this rolling bearing with a grease reservoir, the base oil separated from the grease passes through the oil discharge gap 14 and the outer ring 2 due to temperature fluctuations due to the heat cycle in the grease reservoir 10 due to repeated operation stop and restart. Since the oil is supplied to the raceway surface 2a, the lubricating oil is reliably supplied. In addition, since the base oil is discharged to the raceway surface 2a of the outer ring 2 also by the capillary phenomenon in the oil discharge gap 14, lubrication is further ensured. As a result, using only the grease sealed in the bearing, it is possible to increase the speed, extend the service life, eliminate maintenance, and supply a stable lubricant.

Since the bearing space of the rolling bearing 6 is sealed on both sides in the axial direction by the seal members 5 and 21, grease leakage can be reliably prevented. Further, the sealing members 5 and 21 prevent foreign matters such as dust and coolant from entering the bearing space from the outside, so that the grease in the rolling bearing 6 is deteriorated and the raceway surfaces 1a and 2a of the inner and outer rings 1 and 2 are moved. Can reduce the biting of foreign matter. As a result, the lubricant can be expected to be supplied to the rolling bearing 6 for a long time, and the life can be further extended.
This rolling bearing with a grease reservoir is incorporated in the spindle device with the front side of the bearing facing outward (FIG. 8). Therefore, by making the direction of the lip 21a of the seal member 21 on the bearing front side outward with respect to the bearing space, the effect of preventing foreign matters such as dust and coolant from entering the bearing space from the outside is enhanced. .

  FIG. 3 shows a different embodiment of the invention. This rolling bearing with a grease reservoir is also a contact type sealing member 21 whose sealing means closes the annular gap 20, and this sealing member 21 is provided to be fitted to the outer periphery of the grease reservoir forming component 7. Specifically, the seal member 21 is fitted to the reduced diameter portion 7 c formed on the outer peripheral surface of the grease reservoir forming component 7, thereby preventing the seal member 21 from interfering with the outer ring positioning spacer 9. . Also in this case, the seal member 21 can be easily provided, and the same effect as described above can be obtained.

  FIG. 4 shows yet another embodiment of the present invention. In this rolling bearing with a grease reservoir, the sealing means comprises a labyrinth seal 22. The labyrinth seal 22 extends toward the inner diameter side at the front end of the bearing, which is a portion protruding in the axial direction opposite to the rolling bearing 6 relative to the grease reservoir forming component 7 in the outer ring positioning spacer 9 which is a fixed side spacer. A collar portion 9c is provided, and a spacer gap 23 between the collar portion 9c and the inner ring positioning spacer 8 which is a rotation side spacer is narrowed. Further, a step portion 24 is provided on the outer peripheral surface of the inner ring positioning spacer 8 toward the inner diameter side, and the outer peripheral surface extending from the step portion 24 to the opposite side in the axial direction relative to the rolling bearing 6, that is, the bearing front side is inclined to the outer diameter side. The inclined surface 25 is used.

  By providing a step portion 24 on the outer peripheral surface of the inner ring positioning spacer 8, the spacer gap 23 between the inner ring positioning spacer 8 and the collar portion 9 c of the outer ring positioning spacer 9 is formed into a bent path shape. Can do. Furthermore, the peripheral surface that continues from the stepped portion 24 to the opposite side in the axial direction with respect to the rolling bearing 6 is an inclined surface 25 that is inclined toward the outer ring positioning spacer 9, so that foreign matters and the like existing in the spacer clearance 23 are centrifuged. The action of scattering the rolling bearing 6 to the opposite side in the axial direction is generated. By these, the effect which prevents that a foreign material and a coolant penetrate | invade in the rolling bearing 6 is heightened.

  FIG. 5 shows a further embodiment of the present invention. This rolling bearing with a grease reservoir also has a labyrinth seal 22 as a sealing means. The labyrinth seal 22 is configured by narrowing the annular gap 20 between the grease reservoir forming component 7 and the inner ring positioning spacer 8. Further, a taper groove 26 having an inclined surface 26a inclined on the grease reservoir forming component 7 side toward the opposite side in the axial direction with respect to the rolling bearing 6 on the outer peripheral surface of the inner ring positioning spacer 8 facing the grease reservoir forming component 7. Is provided.

  When the tapered groove 26 is provided, the inclined surface 26a of the tapered groove 26 scatters foreign matter or the like existing in the annular gap 20 to the opposite side in the axial direction with respect to the rolling bearing 6 by centrifugal force, as shown in FIG. Effect occurs. Thereby, the effect which prevents that a foreign material and a coolant penetrate | invade in the rolling bearing 6 is heightened.

  FIG. 6 shows a further embodiment of the present invention. This rolling bearing with a grease reservoir also comprises a labyrinth seal 22 as a sealing means, and the labyrinth seal 22 is configured by narrowing the annular gap 20 between the grease reservoir forming component 7 and the inner ring positioning spacer 8. Further, the inner ring positioning spacer 8 has a protruding portion 8a that protrudes on the opposite side in the axial direction with respect to the rolling bearing 6 relative to the grease reservoir forming component 7. The protruding portion 8a has an opposite side in the axial direction with respect to the rolling bearing 6. A flange 27 having an inclined surface 27a inclined toward the outer diameter side as it goes is provided.

  In this case, as shown in FIG. 6 (B), the inclined surface 27a of the flange 27 causes the foreign matter to scatter to the opposite side in the axial direction with respect to the rolling bearing 6 due to centrifugal force. 20 becomes difficult to enter.

  FIG. 7 shows yet another embodiment of the present invention. This rolling bearing with a grease reservoir is a combination of the configuration of FIG. 5 and the configuration of FIG. That is, the labyrinth seal 22 is configured by narrowing the annular gap 20 between the grease pool forming component 7 and the inner ring positioning spacer 8, and on the outer peripheral surface of the inner ring positioning spacer 8 facing the grease pool forming component 7. A taper groove 26 having an inclined surface 26 a inclined toward the grease reservoir forming component 7 as it goes in the axial direction opposite to the rolling bearing 6 is provided, and the inner ring positioning spacer 8 is more rolled than the grease reservoir forming component 7. A protrusion 8a that protrudes in the opposite axial direction with respect to the bearing 6 is provided, and a flange 27 that has an inclined surface 27a that inclines toward the outer diameter side toward the opposite side in the axial direction with respect to the rolling bearing 6 is provided in the protrusion 8a. It is provided.

  In this case, since the effect by the taper groove 26 and the effect by the flange 27 can be obtained synergistically, the effect of preventing foreign matters and coolant from entering the rolling bearing 6 is further enhanced.

  FIG. 8 shows an example of a spindle device for a machine tool using the rolling bearing with a grease reservoir of the embodiment shown in FIGS. In this spindle apparatus, the two rolling bearings 30 with the grease reservoir are used in combination on the back surface. Two rolling bearings 30 </ b> A and 30 </ b> B with grease reservoirs rotatably support both ends of the main shaft 31 in the housing 32. The inner ring 1 of each rolling bearing 6 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 a grease reservoir forming part 7 that also serves as an outer ring positioning spacer, an outer ring spacer 40 and outer ring pressing lids 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 end 31a of the front end, and a drive source such as a motor transmits rotation 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 of this configuration, the effects of speeding up, extending the life and maintaining maintenance in the rolling bearings 30A and 30B with the grease reservoir of this embodiment are effectively exhibited. Further, by providing a sealing means comprising a seal member 21 on the side where the grease reservoir forming component 7 is provided with respect to the rolling bearing 6, the grease in the rolling bearing 6 is deteriorated and the raceway of the raceway is applied to the raceway surface. Biting of foreign matter can be reduced. As a result, a long-term supply of the lubricant to the bearing can be expected, and the life can be further extended.

In addition, although this spindle apparatus demonstrated the case where the rolling bearing with a grease pool which concerns on embodiment shown to FIG. 1 and FIG. 2 was applied, even if it uses the rolling bearing with a grease reservoir which concerns on any other embodiment, it is. Good.
In this embodiment, the grease reservoir forming component 7 discharges the base oil of grease from the oil discharge gap 14 which is an oil discharge port, but the grease itself may be discharged.
Further, in each of the above embodiments, the rolling bearing 6 is an angular ball bearing, but the present invention can also be applied to a case where the rolling bearing 6 is a cylindrical roller bearing or a tapered roller bearing.

(A) is sectional drawing of the rolling bearing with a grease pool concerning embodiment of this invention, (B) is the elements on larger scale. It is a side view of the grease pool formation component of the rolling bearing with the grease pool. It is sectional drawing of the rolling bearing with a grease pool concerning different embodiment of this invention. It is sectional drawing of the rolling bearing with a grease pool concerning further another embodiment of this invention. (A) is sectional drawing of the rolling bearing with a grease pool concerning further different embodiment of this invention, (B) is the elements on larger scale of the VB part. (A) is sectional drawing of the rolling bearing with a grease pool concerning further another embodiment of this invention, (B) is the elements on larger scale. It is sectional drawing of the rolling bearing with a grease pool concerning further another embodiment of this invention. It is a block diagram of the spindle apparatus provided with the rolling bearing with a grease reservoir of this invention.

Explanation of symbols

1 ... Inner ring (Rotating raceway)
1a ... raceway surface 2 ... outer ring (fixed side raceway)
2a ... raceway surface 3 ... rolling element 4 ... cage 6 ... rolling bearing 7 ... grease reservoir forming component 8 ... inner ring positioning spacer (rotating side spacer)
8a ... Projection 9 ... Outer ring positioning spacer (fixed side spacer)
10 ... Grease reservoir 14 ... Oil discharge gap (oil discharge port)
20 ... annular gap 21 ... sealing member (sealing means)
22 ... Labyrinth seal (sealing means)
23 ... Space between spacers 24 ... Stepped portion 25 ... Inclined surface 26 ... Tapered groove 26a ... Tapered surface 27 ... Flange 27a ... Tapered surface

Claims (13)

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, and adjacent to the non-rotating fixed-side bearing ring of the inner ring and outer ring that are the bearing rings with respect to the rolling bearing. An annular grease reservoir forming component, and a rotating spacer positioned adjacent to the rotating rotating raceway,
The grease reservoir forming part is formed as a grease reservoir inside, and the grease reservoir is opened in the vicinity of the raceway surface of the stationary side raceway to discharge grease in the grease reservoir or its base oil. Have
A rolling bearing with a grease reservoir, wherein sealing means is provided to prevent foreign matter and the like from entering the rolling bearing from an annular gap between the grease reservoir forming component and the rotating side spacer.   2. The rolling bearing with a grease reservoir according to claim 1, wherein the seal means is a contact-type seal member that closes the annular gap.   3. The rolling bearing with a grease reservoir according to claim 2, wherein the seal member is fitted to the grease reservoir forming component.   In Claim 2, it has the fixed side spacer located in the diameter direction opposite side of the rotation side spacer with respect to the grease pool formation component, and is arranged adjacent to the fixed side raceway, the seal member, A rolling bearing with a grease reservoir provided by being fitted to the fixed spacer.   2. The rolling bearing with a grease reservoir according to claim 1, wherein the sealing means is a labyrinth seal.   6. The fixed-side spacer according to claim 5, further comprising a fixed-side spacer that is disposed on a radially opposite side of the rotating-side spacer with respect to the grease reservoir forming component and is disposed adjacent to the fixed-side raceway. The portion that protrudes in the axial direction opposite to the rolling bearing than the grease reservoir forming part is extended to the vicinity of the rotating side spacer, and the spacer gap between the rotating side spacer and the fixed side spacer Rolling bearing with grease reservoir that has a labyrinth seal by narrowing   7. The peripheral surface according to claim 6, wherein a stepped portion that is separated from the fixed side spacer is provided on a peripheral surface of the rotating side spacer that faces the fixed side spacer, and the stepped portion continues to the opposite side in the axial direction with respect to the rolling bearing. A rolling bearing with a grease reservoir, which has an inclined surface inclined toward the fixed spacer.   6. The rolling bearing with a grease reservoir according to claim 5, wherein an annular gap between the grease reservoir forming component and the rotating side spacer is narrowed to form a labyrinth seal.   9. The taper according to claim 8, wherein a circumferential surface of the rotating side spacer facing the grease reservoir forming component has an inclined surface inclined toward the grease reservoir forming component as it goes to the opposite side in the axial direction with respect to the rolling bearing. Rolling bearing with a grease reservoir with grooves.   9. The rotating side spacer according to claim 8, wherein the rotating side spacer has a protruding portion that protrudes in an axially opposite direction with respect to the rolling bearing relative to the grease reservoir forming component, and the protruding portion is axially opposite to the rolling bearing. A rolling bearing with a grease reservoir provided with a flange having an inclined surface inclined toward the fixed spacer as it goes to the side.   9. The taper according to claim 8, wherein a circumferential surface of the rotating side spacer facing the grease reservoir forming component has an inclined surface inclined toward the grease reservoir forming component as it goes to the opposite side in the axial direction with respect to the rolling bearing. A groove is provided, and the rotating side spacer has a protruding portion that protrudes in the axial direction opposite to the rolling bearing with respect to the grease reservoir forming component, and the protruding portion is axially opposite to the rolling bearing. A rolling bearing with a grease reservoir provided with a flange having an inclined surface inclined toward the fixed spacer as it goes to the side.   The rolling bearing with a grease reservoir according to any one of claims 1 to 11, wherein the rotation-side raceway is an inner ring and the fixed-side raceway is an outer ring. 13. A rolling bearing with a grease reservoir used for supporting a machine tool spindle according to claim 12.

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