JP2008240828A - Grease reservoir part for rolling bearing, and rolling bearing with grease reservoir - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grease reservoir part for a rolling bearing capable of being handled in a form where it is separated from the rolling bearing, and to provide a rolling bearing with a grease reservoir assembled with the grease reservoir part. <P>SOLUTION: The grease reservoir part 6 is arranged adjacent to a non-rotating fixed side bearing ring 2 of an inner ring 1 and an outer ring 2, i.e., the bearing rings relative to the rolling bearing 20 having the inner ring 1, the outer ring 2 and a plurality of rolling bodies 3 interposed between the bearing surfaces 1a, 2a of the inner and outer rings 1, 2. The grease reservoir part 6 has an annular vessel part 10 in which the inside becomes the grease reservoir 12; and an annular in-bearing insertion part 11 projected from the vessel part 10 and inserted to a neighborhood to the bearing surface 2a along a peripheral surface formed with the bearing surface 2a of the fixed side bearing ring 2. The in-bearing insertion part 11 has the inside becoming a flow passage 14 of the grease 7 and has a slit-like grease base oil oozing port 15 extending in a circumferential direction on a distal end 11a. The grease base oil oozing port 15 is sealed by a removable sealing member 18. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a grease retaining part of a rolling bearing that is grease-lubricated, a combination of the rolling bearing and the grease retaining part, and a rolling bearing with a grease reservoir incorporating the grease retaining part.

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

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

  New proposals have been introduced as a means of extending the life of grease. One of them is that a grease reservoir part with a grease reservoir inside is provided in contact with the stationary raceway (for example, the outer ring) and extends from the grease reservoir part to the vicinity of the raceway surface of the stationary raceway. A gap forming piece that forms a gap is provided between the bearing ring and the grease reservoir and the raceway surface of the stationary bearing ring is communicated via the gap (for example, Patent Document 1). 2).

According to this rolling bearing, when the bearing is stopped, the base oil of the grease moves to the gap due to the thickener in the grease and the capillary phenomenon of the gap. When the bearing is operated, the base oil stored in the clearance is discharged from the clearance due to the volume expansion caused by the temperature rise of the fixed-side raceway and the air flow generated by the revolution and rotation of the rolling elements. It moves while adhering to the raceway surface of the raceway and is continuously supplied to the rolling element contact portion.
JP 2005-180629 A JP 2006-132765 A

  In the case of the above configuration, if the grease reservoir part in which grease is 100% sealed in the grease reservoir space and the rolling bearing are separated and handled, a part of the grease enclosed in the grease reservoir part will be exposed. Management becomes unstable. Therefore, in this case, the rolling bearing and the separate grease reservoir component are handled in one piece by fixing them in an assembled state with separate members such as outer ring width direction pressers.

  Although it is possible to integrate the grease reservoir part into the rolling bearing to make it an integral part, it is not easy to manufacture, making it difficult to handle packaging, etc. There is a problem that it becomes difficult.

  An object of the present invention is to solve these problems, and a grease retaining part of a rolling bearing that can be handled in a form separated from the rolling bearing, and a combination of the grease retaining part and the rolling bearing. It is an object of the present invention to provide a rolling bearing with a grease reservoir incorporating the grease reservoir component.

The grease retaining part of the rolling bearing according to the present invention does not rotate among the inner ring and the outer ring that are the bearing rings with respect to the rolling bearing having the inner ring, the outer ring, and a plurality of rolling elements interposed between the raceways of the inner and outer rings. A grease reservoir component disposed adjacent to the stationary bearing ring, and an annular container portion in which the interior is a grease reservoir, and a peripheral surface that protrudes from the container portion and forms a raceway surface of the stationary bearing ring And an annular insertion portion in the bearing that is inserted to the vicinity of the raceway surface. The insertion portion in the bearing serves as a grease flow path and has a slit-like grease base extending in the circumferential direction at the tip. It has an oil oozing port, and this grease base oil oozing port is sealed with a removable sealing member.
According to this configuration, the grease base oil exudation port is sealed with a removable sealing member, so that the grease is not exposed even if the grease reservoir part is handled as a separate part, which causes anxiety in managing the amount of grease charged. It can be handled easily without increasing the reliability of the product.

The combination of the rolling bearing and the grease retaining part of the present invention includes an inner ring, an outer ring, a rolling bearing having a plurality of rolling elements interposed between the raceways of the inner and outer rings, and an inner ring that is a bearing ring with respect to the rolling bearing. And a grease reservoir component arranged adjacent to the non-rotating fixed side raceway of the outer ring, wherein the grease reservoir component includes an annular container portion having a grease reservoir therein, and the container portion. An annular bearing insertion portion that protrudes and is inserted to the vicinity of the raceway surface along a circumferential surface on which the raceway surface of the fixed-side raceway is formed. It is assumed that it has a slit-like grease base oil oozing port at the tip and that extends in the circumferential direction, and this grease base oil oozing port is sealed with a removable sealing member.
According to this combination, the grease reservoir component is attached to the rolling bearing with the sealing member removed. When handling a grease reservoir part alone, it is sealed with a sealing member as described above. Therefore, even if the grease reservoir part is handled as a separate part, the grease is not exposed, which causes anxiety in managing the amount of grease contained. It can be handled easily without increasing the reliability of the product. When grease pool parts are mounted on the rolling bearing, the base oil separated from the grease due to pressure fluctuations due to heat cycles in the grease pool due to repeated stoppage and resumption of operation of the rolling bearing causes the base oil separated from the grease to enter the bearing base. The oil is discharged from the bleed port to the raceway surface of the stationary side raceway, so that the lubricating oil is reliably supplied. As a result, only the grease enclosed in the bearing can be used to achieve high speed, long life, and maintenance-free.

In the combination of the rolling bearing and the grease retaining part of the present invention, the stationary side race is an outer ring, and the grease retaining part of the rolling bearing is composed of an outer ring spacer and a grease retaining part body attached to the inner periphery of the outer ring spacer. May be configured.
When the stationary raceway is an outer ring, the grease storage part insert-in part in the bearing is provided along the inner peripheral surface of the outer ring. Since it scatters to the inner peripheral part of the outer ring, the connection of the grease base oil between the grease oozing port of the insertion part in the bearing and the raceway surface is ensured.

  In the combination of the rolling bearing and the grease collecting part of the present invention, the stationary side race is provided in a direction in which a step surface following the raceway surface is separated from the rolling element, and the insertion portion in the bearing is the fixed side. Inserted into the bearing along the circumferential surface where the raceway surface of the bearing ring is formed, and the tip surface forms a gap for exudation of grease base oil between the stepped surface of the stationary side raceway ring. It may be what you do.

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. Of these, the grease reservoir component is arranged adjacent to the non-rotating fixed-side raceway. The grease reservoir component includes an annular container portion having a grease reservoir therein, and the fixed-side track protruding from the container portion. An annular bearing insertion portion that is inserted to the vicinity of the raceway surface along the circumferential surface on which the raceway surface of the ring is formed. It has a slit-like grease base oil bleeding port extending in the circumferential direction.
According to the rolling bearing with a grease reservoir having this configuration, the grease is enclosed in the grease reservoir of the grease reservoir component, and the grease as the initial lubricating oil is enclosed inside the bearing. The base oil separated from the grease from the grease base oil exudation port of the insertion part in the bearing to the raceway surface of the fixed-side bearing ring due to the pressure fluctuation due to the heat cycle in the grease reservoir accompanying the repeated stoppage and resumption of operation of the rolling bearing Since the oil is discharged, the lubricating oil is reliably supplied. As a result, only the grease enclosed in the bearing can be used to achieve high speed, long life, and maintenance-free.

The grease retaining part of the rolling bearing according to the present invention does not rotate among the inner ring and the outer ring that are the bearing rings with respect to the rolling bearing having the inner ring, the outer ring, and a plurality of rolling elements interposed between the raceways of the inner and outer rings. A grease reservoir component disposed adjacent to the stationary bearing ring, and an annular container portion in which the interior is a grease reservoir, and a peripheral surface that protrudes from the container portion and forms a raceway surface of the stationary bearing ring And an annular insertion portion in the bearing that is inserted to the vicinity of the raceway surface. The insertion portion in the bearing serves as a grease flow path and has a slit-like grease base extending in the circumferential direction at the tip. Since it has an oil oozing port and this grease base oil oozing port is sealed with a detachable sealing member, it is possible to handle the grease reservoir component in a form separated from the rolling bearing.
Since the combination of the rolling bearing and the grease retaining part of the present invention is a combination of the grease retaining part and the rolling bearing having the above configuration, only the grease sealed in the bearing is mounted when the grease retaining part is mounted on the rolling bearing. Can be used to achieve high speed, long life, and maintenance-free operation, and grease base oil exudation ports are sealed with a sealing member when grease reservoir parts are handled alone when not mounted on a rolling bearing. Therefore, the grease storage parts can be handled without causing the problem of grease leakage, and the reliability when used for rolling bearings is improved.
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 raceways of the inner and outer rings, and an inner ring and an outer ring that are race rings with respect to the rolling bearing. Of these, the grease reservoir component is arranged adjacent to the non-rotating fixed-side raceway. The grease reservoir component includes an annular container portion having a grease reservoir therein, and the fixed-side track protruding from the container portion. An annular bearing insertion portion that is inserted to the vicinity of the raceway surface along the circumferential surface on which the raceway surface of the ring is formed. Since it has a slit-like grease base oil oozing port extending in the circumferential direction, only the grease enclosed in the bearing can be used to achieve high speed, long life, and maintenance-free.

An embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a cross-sectional view of the grease reservoir component 6 of this embodiment, and FIG. 2 shows a cross-sectional view of a rolling bearing 20 with a grease reservoir assembled with the grease reservoir component 6.
The rolling bearing 20 includes a plurality of rolling elements 3 interposed between the raceways 1 a and 2 a of the inner ring 1, the outer ring 2, and the inner and outer rings 1 and 2, and the grease reservoir component 6 is disposed adjacent to the outer ring 2. . The plurality of rolling elements 3 are held by a cage 4, and one end of the bearing space between the inner and outer rings 1 and 2 is sealed with a seal 5. The rolling bearing 20 is an angular ball bearing, the seal 5 is provided at the end on the bearing back side, and the grease reservoir 6 is provided on the bearing front side. The grease reservoir component 6 also serves as a seal on the front side of the bearing, preventing grease leakage from the front side of the bearing. In the drawing, the crossed hatched portion indicates a portion filled with the grease 7. The inner ring 1 of the rolling bearing 20 is fitted to a main shaft (not shown) so as 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.

  On the outer ring 2 serving as a fixed-side raceway, a step surface 2b following the raceway surface 2a follows the outer ring front side away from the rolling elements 3, that is, the edge on the opposite side to the direction in which the contact angle occurs on the raceway surface 2a. Is provided. 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.

  The grease reservoir component 6 is configured as a separate component from the rolling bearing 20 and includes an outer ring spacer 8 and a grease reservoir component body 9 attached to the inner periphery of the outer ring spacer 8. Since the outer ring spacer 8 is provided in contact with the front side width surface of the outer ring 2, the grease reservoir 6 is disposed on the outer diameter side of the inner ring positioning spacer 26. The grease reservoir component main body 9 includes an annular container portion 10 in which the grease reservoir 12 is formed, and an annular bearing that protrudes from the container portion 10 and is inserted along the inner peripheral surface 2c of the outer ring 2 to the vicinity of the raceway surface 2a. It consists of the inner insertion part 11. Specifically, the bearing inner insertion portion 11 is inserted into the bearing along the inner peripheral surface 2 c of the outer ring 2, and as shown in an enlarged view in FIG. A gap 13 for exuding grease base oil is formed between the step surface 2b. The inside-bearing insertion portion 11 has a flow passage 14 for the grease 12 inside, and has a slit-like grease base oil oozing port 15 extending in the circumferential direction at the tip 11a. In addition, a flow path 16 that connects the grease base oil bleeding port 15 and the gap 13 is formed between the outer peripheral surface of the distal end of the bearing insertion portion 11 and the inner peripheral surface 2c of the outer ring 2 that faces the inner peripheral surface. . As a result, the grease reservoir 12 inside the container portion 10 communicates with the gap 13 via the flow path 14, the grease base oil oozing port 15, and the flow path 16.

  The grease reservoir component 6 is provided with an elastic sealing member 17 such as an O-ring over the entire circumference of the intersection between the outer ring contact surface side end surface of the outer ring spacer 8 and the outer peripheral surface of the bearing insertion portion 11. With the outer ring spacer 8 in contact with the width surface on the front side of the outer ring 2, the elastic sealing member 17 is interposed in the contact portion between the outer ring 2 and the outer ring spacer 8, so that the contact portion is sealed. Grease leakage is prevented.

  In a state where the grease reservoir component 6 is a separate product before being assembled to the rolling bearing 20, as shown in FIG. 1, the grease 7 is put into the grease reservoir 12 until it reaches the grease base oil bleeding port 15 of the insertion portion 11 in the bearing. After 100% sealing, the grease base oil oozing port 15 is sealed with a sealing member 18 such as a removable sealing tape. The sealing member 18 may be a cap made of a plastic or rubber ring in addition to the seal tape. The sealing member 18 is removed when the grease reservoir component 6 is assembled to the rolling bearing 20.

  As described above, the grease reservoir component 6 is a component that is disposed adjacent to the outer ring 2 that is a fixed drive wheel of the rolling bearing 20, and has an annular container portion 10 in which the grease reservoir 12 is formed, An annular in-bearing insertion portion 11 is inserted into the vicinity of the raceway surface 2a along the inner peripheral surface 2c on which the raceway surface 2a of the outer ring 2 is formed. In the state of a separate product before assembling to the rolling bearing 20, the grease has a flow path 14 for the grease 7, has a slit-like grease base oil oozing port 15 extending in the circumferential direction at the tip 11 a. Since the base oil exudation port 15 is sealed with a removable sealing member 18, the grease 7 is not exposed even when handled as a separate product, and it is easy without worrying about the management of the amount of grease charged. Can handle , It is possible to improve the reliability of the product.

  The operation of the rolling bearing 20 with a grease reservoir in which the grease reservoir component 6 is assembled as shown in FIG. 2 is as follows. When the bearing is incorporated in the main shaft or the like, the grease reservoir 12, the flow paths 14, 16 and the gap 13 of the grease reservoir component 6 are filled with grease 7, and grease for initial lubrication is sealed in the bearing. Yes.

When the bearing is operated, the base oil and the thickener having different expansion coefficients are separated in the grease 7 stored in the sealed grease reservoir 12 due to the temperature rise during operation. At the same time, the internal pressure of the sealed grease reservoir 12 increases. Due to this internal pressure, the separated base oil is discharged from the gap 13 toward the raceway surface 2 a of the outer ring 2 through the flow path 14, the grease base oil bleeding port 15, and the flow path 16. When the temperature rises and reaches a steady state, the internal pressure increase factor disappears, so that the internal pressure 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 12 also decreases, and the internal pressure of the grease reservoir 12 becomes almost atmospheric pressure. At this time, there is no discharge of the base oil due to pressure, and the gap 13 is filled with the base oil. Therefore, in the operation stop state, the grease reservoir 12 is in a sealed state.
Thereafter, when the operation is resumed, the internal pressure of the grease reservoir 12 rises again. By such a heat cycle of temperature rise and fall, pressure fluctuations in the grease reservoir 12 are repeated, and the base oil separated from the grease 7 is surely moved to the gap 13 and repeatedly supplied to the raceway surface 2a of the outer ring 2. Is done.

  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, the base oil of the grease 7 moves from the flow paths 14 and 16 to the gap 13 due to the thickener in the grease 7 and the capillary phenomenon of the gap 13, and this capillary phenomenon and the surface tension of the oil In combination, the base oil is held in the gap 13 in an oily state. When the bearing is operated, the base oil stored in the gap 13 is discharged from the gap 13 due to the volume expansion caused by the temperature increase of the outer ring 2 generated by the operation and the air flow generated by the revolution and rotation of the rolling element 3, and the outer ring. It moves while adhering to the two raceway surfaces 2a and is continuously supplied to the rolling element contact portion.

As described above, in the rolling bearing 20 with the grease reservoir, the base oil separated from the grease 7 passes through the gap 13 in the outer ring 2 due to the pressure fluctuation caused by the heat cycle in the grease reservoir 12 due to the repeated operation stop and restart. Since the oil is discharged onto 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 above-described capillary phenomenon in the gap 13, lubrication is further ensured.
As a result, only the grease enclosed in the bearing can be used to achieve high speed, long life, and maintenance-free.

  In this embodiment, the stationary raceway is the outer ring 2, and the stepped surface 2 b is provided on the outer ring 2. When the rolling bearing 20 is rotated in a grease-filled state, the sealed grease is caused by centrifugal force. Since it scatters to the inner diameter part of the outer ring, the base oil is reliably connected between the gap 13 and the raceway surface 2a. As a result, the base oil that is consumed as lubricating oil in the rolling element contact portion is replenished from the grease reservoir 12 through the gap 13 to the raceway surface 2a, and the lubricating oil is more stably replenished.

  In this embodiment, the rolling bearing 20 is an angular ball bearing, and the stepped surface 2b is formed following the edge on the side opposite to the direction in which the contact angle occurs on the raceway surface 2a. Can be more easily disposed immediately below the rolling elements 3. Thereby, the level | step difference surface 2b can be brought close to the center vicinity of the rolling element 3, and the replenishment of the lubricating oil from the clearance gap 13 to the track surface 2a can be performed more efficiently.

  In the above-described embodiment, the tip 11 a of the bearing inner insertion portion 11 in the grease reservoir component 6 is opposed to the step surface 2 b on the inner periphery of the outer ring 2, and the gap between the tip 11 a of the bearing inner insertion portion 11 and the outer ring 2 is reached. However, the present invention is not limited to this, and as shown in FIG. 4, the inner peripheral surface on the front side of the outer ring 2 having a tapered surface is described. This is applied to a configuration example in which the bearing inner insertion portion 11 is arranged along 2c to form a gap 13 communicating with the grease reservoir 12 between the outer periphery of the bearing inner insertion portion 11 and the inner peripheral surface 2c of the outer ring 2. May be.

  FIG. 5 shows an example of a spindle device for a machine tool using the rolling bearing 20 with a grease reservoir of the embodiment shown in FIGS. In this machine tool spindle device, two of the rolling bearings 20 are used for back-to-back alignment. The two rolling bearings 20 </ b> A and 20 </ b> B rotatably support both ends of the main shaft 21 within the housing 22. The inner ring 1 of each of the rolling bearings 20A and 20B is positioned by an inner ring positioning spacer 26 and an inner ring spacer 27, and is fastened and fixed to the main shaft 21 by an inner ring fixing nut 29. The outer ring 2 is positioned and fixed in the housing 22 by outer ring spacers 8 and 30 and outer ring holding lids 31 and 32. The housing 22 is formed by fitting a housing inner cylinder 22A and a housing outer cylinder 22B, and an oil passage groove 33 for cooling is provided in the fitting portion.

  The spindle 21 is provided with a chuck (not shown) for detachably attaching a tool or a work (not shown) to the front end 21a, and a drive source such as a motor transmits rotation to the rear end 21b. They are connected via a mechanism (not shown). The motor may be built in the housing 22. 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 stable supply of lubricant oil, higher speed, longer life, and maintenance-free operation in the rolling bearings 20A and 20B with grease reservoir of this embodiment are effectively exhibited.

FIG. 3 is a cross-sectional view of a part of a grease reservoir component according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of a part of a rolling bearing with a grease reservoir assembled with the grease reservoir component. FIG. 3 is a partially enlarged sectional view of FIG. 2. FIG. 6 is a partial cross-sectional view of a rolling bearing with a grease reservoir according to another embodiment of the present invention. It is sectional drawing of the spindle apparatus for machine tools using the rolling bearing with a grease pool of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Inner ring 2 ... Outer ring 1a, 2a ... Raceway surface 2b ... Step surface 3 ... Rolling element 6 ... Grease storage part 8 ... Outer ring spacer 9 ... Grease storage part main body 10 ... Container part 11 ... Bearing insertion part 12 ... Grease storage 13 ... Gap 14 ... Flow path 15 ... Grease base oil oozing port 18 ... Sealing member 20 ... Rolling bearing with grease reservoir

Claims (5)

  For a rolling bearing having an inner ring, an outer ring, and a plurality of rolling elements interposed between the raceways of the inner and outer rings, the inner ring and the outer ring, which are the race rings, are arranged adjacent to the non-rotating fixed raceway ring. A grease reservoir component, which is inserted to the vicinity of the raceway surface along an annular container portion in which the interior is a grease reservoir, and a peripheral surface that protrudes from the container portion and forms a raceway surface of the stationary raceway. This bearing internal insertion portion has a grease passage inside and a slit-like grease base oil oozing port extending in the circumferential direction at the tip. Grease storage parts for rolling bearings with oil bleed ports sealed with removable sealing members.   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 adjacent to the non-rotating fixed-side raceway of the inner ring and outer ring as the bearing rings with respect to the rolling bearing. The grease reservoir part is formed with an annular container part having a grease reservoir inside, and a raceway surface of the fixed-side raceway is formed by projecting from the container part. And an annular bearing insertion portion that is inserted along the circumferential surface to the vicinity of the raceway surface. The bearing insertion portion has a slit shape extending in the circumferential direction at the tip thereof as a grease passage. A combination of a rolling bearing and a grease reservoir part having a grease base oil exudation port, and the grease base oil exudation port sealed with a removable sealing member.   3. The combination of a rolling bearing and a grease reservoir component according to claim 2, wherein the fixed raceway is an outer ring, and includes an outer ring spacer and a grease reservoir component body attached to the inner periphery of the outer ring spacer.   4. The fixed-side bearing ring according to claim 2, wherein the fixed-side raceway is provided in a direction in which a step surface following the raceway surface is separated from the rolling element, and the in-bearing insertion portion is a raceway of the fixed-side raceway ring. It is inserted into the bearing along the peripheral surface where the surface is formed, and the tip end surface forms a gap for exudation of grease base oil between the stepped surface of the stationary side race. Combination of rolling bearings and grease storage parts.   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 adjacent to the non-rotating fixed-side raceway of the inner ring and outer ring as the bearing rings with respect to the rolling bearing. The grease reservoir part is an annular container part having a grease reservoir inside, and a peripheral surface that protrudes from the container part to form a raceway surface of the stationary side race ring. And an annular insertion portion in the bearing that is inserted to the vicinity of the raceway surface. The insertion portion in the bearing serves as a grease flow path and has a slit-like grease base extending in the circumferential direction at the tip. Rolling bearing with grease reservoir with oil oozing opening.

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