JP2009144745A - Rolling bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device capable of preventing seizure in a retainer even when a small amount of lubricating oil is present, and thus capable of preventing the lubricating oil from being wasted. <P>SOLUTION: The rolling bearing device comprises an inner ring 2, an outer ring 3, a rolling body 4 rolling between inner and outer ring raceway surfaces 2a, 3a. and the retainer 5 having a plurality of pockets 5c retaining a pair of annular parts 5a, a pillar part 5b and the rolling body 4, and having a surface 5d to be guided which is slidably abutted on a guiding surface 3c of the outer ring 3 to guide the rotation. The lubricating oil is supplied into an radial gap between the retainer 5 and the inner ring 2. An inclined surface 5e1 having a mountain-shaped cross section is continuously formed on an inner peripheral surface 5e of the annular part 5a constituting the surface 5d to be guided of the retainer 5 throughout the entire periphery for causing the lubricating oil supplied into the inner peripheral surface 5e to flow toward a part corresponding to a circumferential center of each pocket 5c of the inner peripheral surface 5e by centrifugal force generated by the rotation of the retainer 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rolling bearing, and more particularly to a rolling bearing lubricated with lubricating oil.

Conventionally, as an angular contact ball bearing having an inner ring, an outer ring, a ball as a rolling element disposed between them, and a cage for holding the ball, one shoulder of the inner circumference of the outer ring and the outer circumference of the cage A so-called outer ring guide type is provided in which rotation of the cage is guided by sliding contact with (see Patent Document 1).
On the other hand, in order to supply a necessary amount of lubricating oil as needed, the rolling bearing has an oil supply unit having a pump for discharging the lubricating oil and a tank for storing the lubricating oil. A rolling bearing device has been proposed in which lubricating oil is intermittently supplied in small amounts (see Patent Document 2).

JP 2004-347001 A JP 2004-108388 A

In the angular ball bearing described in Patent Document 1, if the amount of lubricating oil to be applied in advance is small, seizure occurs due to poor lubrication on the outer peripheral surface and pocket of the cage, while the amount of lubricating oil is excessive. Further, there has been a problem that the lubricating oil is wasted by surplus lubricating oil flowing out of the bearing. Further, in the rolling bearing device described in Patent Document 2, when an outer ring guide type angular ball bearing is used as the rolling bearing, the same problem as described above may occur.
The present invention has been made in view of such circumstances, and even if the amount of lubricating oil is small, it is possible to prevent seizure from occurring in the cage, and in turn, waste of the lubricating oil is caused. An object of the present invention is to provide a rolling bearing that can be prevented.

  The rolling bearing of the present invention has an inner ring having an inner ring raceway surface on the outer periphery and an outer ring raceway surface on the inner periphery, and the inner peripheral surface on one side or both sides in the axial direction of the outer ring raceway surface is configured as a guide surface for a cage. An outer ring, a plurality of rolling elements that roll between the inner ring raceway surface and the outer ring raceway surface, a pair of annular portions facing each other in the axial direction, and an axial extension between both annular portions. And a plurality of pillars that are arranged at equal intervals in the circumferential direction and connect the two annular parts, and a plurality of pockets that are formed between adjacent pillars and hold the rolling elements, and guide the outer ring. A guided surface comprising an outer peripheral surface including an outer peripheral surface of an annular portion facing the surface, and a rotation guided by sliding contact with the guide surface of the outer ring. In the rolling bearing supplied to the radial clearance between the inner ring and the guided surface of the cage is configured. On the inner peripheral surface of the ring portion, the lubricating oil supplied to the inner peripheral surface is caused to flow toward a portion corresponding to the center in the circumferential direction of each pocket of the inner peripheral surface by centrifugal force accompanying the rotation of the cage. A plurality of inclined surfaces having a mountain shape in cross section are formed continuously over the entire circumference.

  In this rolling bearing, the lubricating oil supplied to the inner peripheral surface of the annular portion is centrifuged by the rotation of the cage by an inclined surface having an angled cross section formed on the inner peripheral surface of the annular portion of the cage. The inner circumferential surface can be made to flow toward a portion corresponding to the center in the circumferential direction of each pocket, and the flowed lubricating oil is guided into the pocket to guide the outer ring and the guided surface of the cage. Can be supplied effectively between. As a result, it is possible to prevent seizure from occurring in the cage even when the supply amount of the lubricating oil is small.

In the rolling bearing, an inclined surface having a mountain-shaped cross section is formed on the inner peripheral surface of each column portion to allow the lubricating oil supplied to the inner peripheral surface to flow toward each pocket by centrifugal force accompanying rotation of the cage. Preferably it is.
In this case, an inclined surface having a mountain-shaped cross section is also formed on the inner peripheral surface of the column part, so that the lubricating oil supplied to the inner peripheral surface of the column part is directed to each pocket by the centrifugal force accompanying the rotation of the cage. Can be made to flow. As a result, more lubricating oil can be introduced into the pocket, so that the lubricating oil can be more effectively supplied between the guide surface of the outer ring and the guided surface of the cage. As a result, it is possible to prevent seizure from occurring in the cage with less lubricating oil.

  In the rolling bearing, each inclined surface is preferably further inclined toward the axial center of the cage. In this case, since the lubricating oil flows toward the axial center of the cage, the lubricating oil can be more efficiently guided into the pocket. As a result, it is possible to prevent seizure from occurring in the cage with a smaller amount of lubricating oil.

  According to the rolling bearing of the present invention, the lubricating oil supplied to the inner peripheral surface of the annular portion is guided into the pocket by the inclined surface having the mountain-shaped cross section formed on the inner peripheral surface of the annular portion of the cage. Since it can be supplied effectively between the guide surface of the outer ring and the guided surface of the cage, it is possible to prevent seizure from occurring on the cage even if the amount of lubricating oil is small. As a result, waste of lubricating oil can be prevented.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a schematic sectional view of a rolling bearing according to a first embodiment of the present invention. A rolling bearing 1 in FIG. 1 is an angular ball bearing including an inner ring 2, an outer ring 3, balls 4 as rolling elements arranged therebetween, and a cage 5 that holds the balls 4. .

The inner ring 2 is formed in an annular shape, and has a groove-shaped inner ring raceway surface 2a formed on the outer periphery thereof over the entire circumference.
The outer ring 3 is also formed in an annular shape, and has a groove-shaped outer ring raceway surface 3a formed on the inner periphery of the outer ring 3 over the entire circumference. Further, a shoulder 3b is formed on one side in the axial direction of the outer ring raceway surface 3a so as to project radially inward from the other axial side of the outer ring raceway surface 3a. 5 is configured as a guide surface 3c. The outer ring 3 is disposed concentrically with the inner ring 2.

  The cage 5 is made of, for example, a synthetic resin such as a phenol resin, and extends between the pair of annular portions 5a facing each other in the axial direction and the annular portions 5a in the axial direction and arranged at equal intervals in the circumferential direction. It has the some pillar part 5b which connects the said both annular part 5a, and the some pocket 5c which hold | maintains the ball | bowl 4 formed between the adjacent pillar parts 5b.

The cage 5 is disposed between the outer peripheral surface of the inner ring 2 and the inner peripheral surface of the outer ring 3 so as to be substantially concentric with the inner ring 2 and the outer ring 3, and an annular portion 5 a facing the guide surface 3 c of the outer ring 3. The guided surface 5d formed by the outer peripheral surface of the cage 5 including the outer peripheral surface of the outer ring 3 is in sliding contact with the guide surface 3c of the outer ring 3, whereby the rotation of the cage 5 is guided.
The balls 4 are accommodated in the pockets 5c of the cage 5 and are held at predetermined intervals in the circumferential direction, and roll between the inner ring raceway surface 2a and the outer ring raceway surface 3a.
The pair of annular portions 5a and the pockets 5c are provided so as to be symmetric with respect to the axial center line S1 of the cage 5.

FIG. 2 is a side view showing the main part of the cage 5, and FIG. 3 is a view taken along the arrow Z in FIG. 2 showing the inner peripheral surface 5 e of the cage 5. 4A is a sectional view taken along line AA in FIG. 3, FIG. 4B is a sectional view taken along line BB, and FIG. 4C is a sectional view taken along line CC.
As shown in FIGS. 2 and 3, a first inclined surface 5e1 having a mountain-shaped cross section is formed on the inner peripheral surface of each of the pair of annular portions 5a of the cage 5, and the inner portion of each column portion 5b. On the peripheral surface, a second inclined surface 5e2 having a mountain-shaped cross section is formed continuously with the first inclined surface 5e1.

As shown in FIG. 3, the first inclined surface 5 e 1 and the second inclined surface 5 e 2 are formed so as to be symmetrical with respect to the axial center line S 1 of the cage 5.
2 and 3, the first inclined surface 5e1 is provided between the respective circumferential center lines S2 of the adjacent column portions 5b, and the two circumferential center line S2 portions are defined. As a base point, it inclines radially outward toward the portion corresponding to the circumferential center of the pocket 5c, that is, toward the axial line S3 passing through the circumferential center of the pocket 5c. The first inclined surface 5e1 having a mountain-shaped cross section is provided for each of the plurality of pockets 5c in a state of being continuous along the circumferential direction of the annular portion 5a of the cage 5.

  The first inclined surface 5e1 is inclined radially outward from the outer surface 5a1 side of the annular portion 5a toward the axial center line S1 (see FIGS. 4A and 4B). Accordingly, the first inclined surface 5e1 is configured so that the lubricating oil supplied to the inner peripheral surface 5e of the annular portion 5a of the retainer 5 is caused by the centrifugal force accompanying the rotation of the retainer 5 in the axial center. It can be made to flow toward the axial line S3 passing through the center in the circumferential direction of the pocket 5c while being moved toward the line S1. For this reason, the said lubricating oil can be efficiently supplied to the pocket 5c.

The second inclined surface 5e2 is inclined radially outward toward each of the two adjacent pockets 5c with the circumferential center line S2 of each column portion 5b as a ridgeline R (FIG. 4 ( c)). The second inclined surface 5e2 is further inclined radially outward from the boundary with the first inclined surface 5e1 toward the axial center line S1 of the cage 5 (see FIGS. 4A and 4B). ).
Therefore, the second inclined surface 5e2 can cause the lubricating oil supplied to the inner peripheral surface of the column portion 5b to flow into the pocket 5c.
Further, the first inclined surface 5e1 and the second inclined surface 5e2 form one continuous inclined surface at both side portions sandwiching the axial center line S1 of the cage 5.

The rolling bearing 1 is lubricated by supplying a small amount of lubricating oil into the bearing by the oil supply unit K. Here, “a trace amount” of lubricating oil means that the amount of lubricating oil supplied at a time is on the order of nanoliters (nL).
FIG. 5 is a side view of the rolling bearing 1 in FIG. 1 for explaining the oil supply unit K. FIG.

The oil supply unit K includes, for example, a tank 6 for storing lubricating oil, a pump 7 that sucks and discharges the lubricating oil in the tank 6, and a lubricating oil discharge nozzle that is provided at a discharge port of the pump 7 and discharges the lubricating oil. 8 and a drive unit (not shown) for driving the pump 7.
In this embodiment, as shown in FIGS. 1 and 5, the tank 6 and the pump 7 are built in the rolling bearing 1.

  That is, the inner ring 2 and the outer ring 3 are formed with oil supply unit installation extensions 2b and 3d in addition to the portion for holding the ball 4, and the pump 7 is provided with the oil supply unit installation extension of the outer ring 3. It is detachably attached to the inner peripheral surface of 3d. The tank 6 has an arc shape when viewed from the axial direction, and is detachably attached to the inner peripheral surface of the oil supply unit installation extension 3d of the outer ring 3 so as to be adjacent to the pump 7 in the circumferential direction. It is connected to the pump 7 by a conduit 9.

The pump 7 is a diaphragm pump that sucks the lubricating oil in the tank 6 into the chamber of the pump 7 and discharges it from the lubricating oil discharge nozzle 8 by reciprocating a diaphragm as a driven part by a piezoelectric element.
The lubricating oil discharge nozzle 8 is disposed between the inner peripheral surface 5d of the cage 5 and the inner ring 2, and is open at any position in the axial range where the cage 5 and the inner ring 2 face each other. A small amount of the lubricating oil in 6 is supplied to the radial interval between the cage 5 and the inner ring 2. The opening of the lubricating oil discharge nozzle 8 at the above position prevents the supply of the lubricating oil from being hindered due to the flow of air (air curtain) generated by the rotation of the rolling bearing 1, and prevents the lubricating oil from flowing. Oil droplets can be reliably attached to any one of the cage 5, the inner ring 2, or the balls 4.

The driving unit is provided with a power source battery (or generator) or a transformer circuit of an external power source, a pump control circuit, and the like. The pump 7 is driven by the voltage signal from the driving unit, and the pump 7 is connected from the tank 6. By sucking the lubricating oil, the lubricating oil is discharged from the lubricating oil discharge nozzle 8 at a radial interval between the cage 5 and the inner ring 2.
Thereby, the rolling part in which the ball 4 and the inner and outer ring raceway surfaces 2a and 3a are in contact, the guide part in which the guided surface 5d of the cage 5 and the guide surface 3c of the outer ring 3 are in contact, the ball 4 and the pocket 5a. And between.

  As the type of base oil in the lubricating oil, any of ester, ether, fluorine, silicone, and synthetic hydrocarbon may be used. Examples of lubricating oils include fluorinated polymer oils, fluorinated polyether oils, alkyl diphenyl ether oils, polyphenyl ether oils, polyol ester oils, and polyalphaolefin oils. These may be used alone or in combination of two or more. Can be used.

  According to the rolling bearing 1 having the above-described configuration, the lubricating oil supplied from the lubricating oil discharge nozzle 8 to the inner peripheral surface 5e of the cage 5 is used as the first inclined surface 5e1 formed on the inner peripheral surface 5e of the cage 5. Since the second inclined surface 5e2 can flow toward each pocket 5c by the centrifugal force accompanying the rotation of the cage 5 (see arrow X in FIG. 2), the lubricating oil can be efficiently put into the pocket 5c. The guided lubricating oil can be effectively supplied between the guide surface 3 c of the outer ring 3 and the guided surface 5 d of the cage 5. Therefore, even if the amount of the lubricating oil is small, it is possible to prevent the retainer 5 from being seized. And since the amount of lubricating oil supplied is small, torque fluctuations of the rolling bearing 1 can be reduced, and leakage of lubricating oil to the outside of the bearing can be prevented. As a result, it is possible to prevent seizure from occurring in the cage 5 even when the amount of lubricating oil is small, and thus it is possible to prevent waste of lubricating oil.

  In this way, in the rolling bearing 1, since the inside of the bearing can be lubricated even if the amount of the lubricating oil is small, the interval for supplying the lubricating oil to the tank 6 of the oil supply unit K can be lengthened. Thus, the number of times of maintenance of the rolling bearing 1 can be reduced.

  The present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope of the present invention. For example, in the said embodiment, although the 1st inclined surface 5e1 and the 2nd inclined surface 5e2 are formed in the both sides which pinched | interposed the axial centerline S1 of the internal peripheral surface 5e of the holder | retainer 5, the rolling which concerns on the said embodiment is formed. In the bearing 1, since the cage 5 is guided only by one shoulder 3b of the outer ring 3, the first inclined surface 5e1 and the second inclined surface 5e2 may be formed only on the guide side.

In the embodiment, the first inclined surface 5e1 is inclined radially outward from the outer surface 5a1 side of the annular portion 5a toward the axial center line S1, but the first inclined surface 5e1 is Further, it may be inclined only in the circumferential direction of the cage 5. In this case, the lubricating oil supplied to the inner peripheral surface 5e of the annular portion 5a of the cage 5 is moved toward the circumferential direction of the annular portion 5a by the centrifugal force accompanying the rotation of the cage 5. The lubricating oil that flows toward the axial line S3 passing through the circumferential center of the pocket 5c flows along both the outer side surface 5a1 and the pocket 5c of the annular portion 5a, and the guide surface 3c of the outer ring 3. And the guided surface 5d of the cage 5 are effectively supplied.
Moreover, the 2nd inclined surface 5e2 of the holder | retainer 5 is comprised as needed.

Further, the oil supply unit K only needs to supply a small amount of lubricating oil inside the bearing, and is not limited to the configuration of the above embodiment. For example, an oil mist lubrication device, an oil / air lubrication device, or an oil jet lubrication device may be used as long as a minute amount of lubricating oil can be supplied.
The rolling bearing 1 is not limited to being lubricated by the oil supply unit K, and can be lubricated by another lubrication method, for example, grease.

It is a schematic sectional drawing which shows the rolling bearing which concerns on embodiment of this invention. It is a side view which shows the principal part of the holder | retainer of the rolling bearing of FIG. FIG. 3 is a Z arrow view in FIG. 2 showing an inner peripheral surface of the cage. (A) is AA sectional drawing of FIG. 3, (b) is also BB sectional drawing, (c) is CC sectional drawing similarly. It is a side view of the rolling bearing of FIG. It is a schematic sectional drawing which shows the other attachment position of an oil supply unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rolling bearing 2 Inner ring 3 Outer ring 3c Guide surface 4 Rolling element (ball)
DESCRIPTION OF SYMBOLS 5 Cage 5a Annular part 5b Column part 5c Pocket 5d Guided surface 5e Inner peripheral surface 5e1 First inclined surface 5e2 Second inclined surface 6 Tank 7 Pump 8 Lubricating oil discharge nozzle 9 Conduit S1 Axial centerline K Lubrication unit

Claims (3)

An inner ring having an inner ring raceway surface on the outer periphery;
An outer ring having an outer ring raceway surface on the inner periphery, and an inner peripheral surface on one side or both sides in the axial direction of the outer ring raceway surface configured as a guide surface for the cage;
A plurality of rolling elements rolling between the inner ring raceway surface and the outer ring raceway surface;
A pair of annular portions facing each other in the axial direction, a plurality of pillar portions extending in the axial direction between the annular portions and arranged at equal intervals in the circumferential direction, and connecting the annular portions, and adjacent pillar portions And a plurality of pockets formed between the outer ring and a guide surface comprising an outer peripheral surface including an outer peripheral surface of an annular portion facing the guide surface of the outer ring. A cage whose rotation is guided by contact,
In a rolling bearing in which lubricating oil is supplied to a radial clearance between the cage and the inner ring,
Lubricating oil supplied to the inner peripheral surface is applied to the inner peripheral surface of the annular portion constituting the guided surface of the cage by the centrifugal force accompanying the rotation of the cage. A rolling bearing characterized in that a plurality of inclined surfaces having a mountain-shaped cross section that flow toward a portion corresponding to the direction center are continuously formed over the entire circumference.   2. An inclined surface having a mountain-shaped cross section is formed on the inner peripheral surface of each column portion to allow the lubricating oil supplied to the inner peripheral surface to flow toward each pocket by centrifugal force accompanying rotation of the cage. The rolling bearing described.   The rolling bearing according to claim 1, wherein each inclined surface is further inclined toward the axial center side of the cage.

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