JP2008240775A - Rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing suppressing heat generation by suppressing stirring resistance accompanying the movement of grease as compared with prior art and enhancing reliability of lubrication. <P>SOLUTION: In the rolling bearing, a ball 13 retained in a retainer 15 is interposed between an inner ring 11 and an outer ring 12, and a bearing space is sealed by a seal 14. The retainer 15 is guided by an inner peripheral surface of the outer ring 12, and a notch SL for feeding a grease Gr to an inner peripheral surface is provided over an end surface of the retainer from an outer diameter surface of the retainer guided by the inner peripheral surface. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rolling bearing suitably applied to, for example, an angular ball bearing with a grease-lubricated seal that rotates at high speed.

A conventional rolling bearing will be described with reference to FIG. Grease-lubricated angular ball bearings are put to practical use. For example, an outer ring guide type cage 1 is applied to this angular ball bearing. Some grease lubricated angular ball bearings are provided with a seal 2 for sealing the bearing space between the inner and outer rings in order to retain a large amount of grease. Furthermore, the present applicant has put into practical use an angular ball bearing, a so-called BNS series, in which a grease reservoir is formed in the vicinity of the raceway surface of the outer ring and the amount of grease filled is increased (for example, Non-Patent Document 1). The BNS series angular contact ball bearings have a longer life than standard angular contact ball bearings.
NTN Corporation precision rolling bearing CAT. No. 2260-II / J 04.09.03 (page 57, figure 9.8) JP 2003-227525 A

  However, in the conventional angular contact ball bearing, the grease sealed in the cage inner diameter surface Hm indicated by the arrow in FIG. A so-called running-in operation is performed at the time and after the customer is incorporated (for example, Patent Document 1). The grease is agitated by the running-in operation and moves to a stationary space including the grease reservoir 4 b of the outer ring 4. There is a problem that heat is generated by stirring resistance during the grease movement.

  An object of the present invention is to provide a rolling bearing that suppresses heat generation and suppresses heat generation and improves lubrication reliability compared to the prior art.

  The rolling bearing according to the present invention is a rolling bearing in which a ball held in a cage is interposed between an inner ring and an outer ring, and a bearing space between the inner ring and the outer ring is sealed with a seal. And a feeding portion for feeding grease to the inner circumferential surface of the outer ring from the outer diameter surface of the cage guided to the inner circumferential surface to the end surface of the cage. It is characterized by.

  According to this configuration, the grease is fed into the inner peripheral surface of the outer ring via the feeding portion provided from the outer diameter surface of the cage to the end surface of the cage. Thereby, the grease is spread over the raceway surface of the inner and outer rings. Therefore, it is possible to suppress heat generation by suppressing the stirring resistance associated with the movement of the grease, as compared with the conventional technique in which the grease is moved from the inner diameter of the cage to a stationary space including the grease reservoir of the outer ring. Thereby, deterioration of grease can be prevented and the bearing life can be extended. Therefore, it is possible to realize a rolling bearing that suppresses heat generation by suppressing the agitation resistance associated with grease movement during the break-in operation and suppresses heat generation and improves the lubrication reliability. In addition, the number of types of grease in the applicable operating temperature range can be increased and the degree of freedom in bearing design can be increased.

  In the present invention, the feeding section may be provided at a plurality of locations in the circumferential direction and cut out from the outer diameter surface of the cage to the end surface of the cage. With such a notch, the grease can be easily and reliably fed into the inner peripheral surface of the outer ring.

  In this invention, an outer ring grease retaining groove that is recessed radially outward is formed on the inner circumferential surface of the outer ring, and a plurality of notches of the cage are formed at regular intervals in the circumferential direction. You may form these notches in the pillar part which is a pocket holding a ball | bowl, and adjoins the circumferential direction pocket. When the notch is formed in the column portion, it is possible to suppress a decrease in the rigidity strength of the cage, and the cage is undesirably deformed due to the centrifugal force acting on the cage during the bearing operation. Can be prevented. In addition, lubrication reliability can be further improved by feeding grease into the outer ring grease reservoir groove.

In the present invention, the feeding section may be a through hole provided at a plurality of locations in the circumferential direction and extending from the outer diameter surface of the cage to the end surface of the cage. With such a through hole, the grease can be easily and reliably fed into the inner peripheral surface of the outer ring.
In this invention, an outer ring grease retaining groove that is recessed radially outward is formed on the inner circumferential surface of the outer ring, and a plurality of through holes of the cage are formed at regular intervals in the circumferential direction. You may form these through-holes in the pillar part which is a pocket which hold | maintains a ball | bowl, and adjoins the circumferential direction pocket. When the through hole is formed in the pillar portion, it is possible to suppress a decrease in the rigidity strength of the cage, and the cage is undesirably deformed due to a centrifugal force acting on the cage during the bearing operation. Can be prevented. In addition, lubrication reliability can be further improved by feeding grease into the outer ring grease reservoir groove.

  In the rolling bearing of the present invention, the grease is fed to the inner peripheral surface of the outer ring through the feeding portion provided from the outer diameter surface of the cage to the end surface of the cage. A rolling bearing with reduced heat generation and improved lubrication reliability can be realized.

  An embodiment of the present invention will be described with reference to FIGS. The rolling bearing 10 according to the first embodiment is applied to an angular ball bearing. This rolling bearing 10 has a ball 13 interposed between an inner ring 11 and an outer ring 12, and a bearing space between the inner ring 11 and the outer ring 12 is sealed with seals 14 and 14, and is used for grease lubrication. The The seal 14 is a non-contact type seal attached to the seal groove 12 a of the outer ring 12 and having an inner diameter side end close to the inner ring 11. The balls 13 are held by a cage 15 so as to roll freely at a predetermined interval in the circumferential direction. A raceway groove 11 a and a raceway groove 12 b are provided on the outer peripheral surface of the inner ring 11 and the inner peripheral surface of the outer ring 12 so that the contact angle with the ball 13 is a predetermined angle.

  The cage 15 is formed in a ring shape so that the wall thickness Hn is constant over the entire circumference. A cylindrical hole-shaped pocket Pt that holds the ball 13 in a rollable manner is formed at the center of the cage 15 in the width direction. As shown in FIG. 1B, a plurality of pockets Pt are arranged at regular intervals in the circumferential direction. The cage 15 is made of, for example, a resin material or a metal cut product, and is guided to the inner peripheral surface 12 n of the outer ring 12. A corner chamfer 16 is applied to the corner between the inner diameter surface Hd1 of the cage and the end surface Ht of the cage. A portion serving as an outer ring guide surface on the inner peripheral surface 12n of the outer ring 12 that guides the cage 15, that is, an inner portion in the axial direction of the outer ring inner peripheral surface 12n in the axial direction of the outer ring seal groove 12a is the axial direction of the track groove 12b. On both sides, an outer ring grease reservoir groove 12c described later is provided. The outer ring grease reservoir groove 12c is formed in the inner peripheral surface 12n of the outer ring 12 in the vicinity of both sides in the axial direction of the raceway groove 12b so as to form an annular concave portion that is recessed radially outward from the outer ring guide surface. . The inner peripheral surface 12n of the outer ring 12 has a cylindrical surface shape, and no so-called counter bore is provided.

Next, the feeding part of the cage 15 will be described.
A notch SL is formed as a feeding portion for feeding the grease Gr from the both sides in the width direction of the cage outer diameter surface Hd2 to the cage end surface Ht. As shown in FIG. 1B, a plurality of notches SL in the cage 15 are formed at regular intervals in the circumferential direction. Further, in the retainer 15, one end in the axial direction, that is, a plurality of notches SL at the right end in FIG. Are formed at the same phase, i.e., at the same left and right positions in FIG. Further, as shown in FIG. 1B, the left and right cutouts SL are disposed at positions in the retainer 15 that are in the same phase in the column portion 17 between the pockets Pt adjacent in the circumferential direction. .

  Each notch SL has a rectangular cross section and a rectangular shape in plan view. Moreover, each notch SL has a predetermined distance and step Sd inward in the radial direction with respect to the outer diameter of the cage. The step dimension Sp from the outer diameter of the cage to the step Sd is, for example, 1 / of the radial dimension from the outer diameter of the cage to the inner diameter of the cage, that is, the thickness Hn, in order to suppress a decrease in the rigidity strength of the cage 15. 3 or less. However, the step dimension Sp is not necessarily limited to 1/3 or less of the radial dimension Hn.

  Of each notch SL of the retainer 15, the width direction dimension Hw from the wall portion Sh perpendicular to the axial direction to the retainer end portion Ht is, for example, substantially the same as the column width 15HW of the retainer 15. It is stipulated in. Further, the notch width Kh in the circumferential direction of each notch SL of the cage 15 is defined to be, for example, about ½ of the circumferential length 17e of the column part 17 between the pockets Pt. ing. As a result, the wall portion Sh that forms part of each notch SL of the retainer 15 can be sufficiently and sufficiently separated from the pocket Pt that retains the balls 13, thereby reducing the rigidity strength of the retainer 15. Can be suppressed. In addition, it is not limited to the said width direction dimension.

  On the outer peripheral surface of the inner ring 11, a counter bore 11b that gradually decreases in diameter as the outer diameter approaches the end surface is provided on one side of the raceway groove 11a. The counter bore 11b is provided on a portion of the outer peripheral surface opposite to the direction in which the contact angle occurs. At the time of assembling the bearing, the rolling bearing 10 heats the outer ring 12 with the ball 13 assembled thereto to expand the outer ring 12 radially outward by a predetermined small distance, and from the counter bore 11b side to the inner ring 11 in the axial direction. Can be assembled by inserting.

  According to the rolling bearing 10 according to the first embodiment described above, the grease Gr can be initially sealed in the inner diameter of the outer ring by using the notch SL of the outer ring guide type retainer 15. Therefore, it is possible to suppress heat generation by suppressing the stirring resistance associated with the movement of the grease, as compared with the conventional technique in which the grease is moved from the inner diameter of the cage to a stationary space including the grease reservoir of the outer ring.

  Thereby, deterioration of the grease Gr can be prevented and the bearing life can be extended. Therefore, it is possible to realize a rolling bearing that suppresses heat generation and suppresses heat generation and improves lubrication reliability as compared with the prior art. In addition, the number of types of grease Gr in the applicable operating temperature range can be increased, and the degree of freedom in bearing design can be increased. By the notch SL, the grease Gr can be easily and reliably fed into the inner peripheral surface of the outer ring 12.

  Further, since the notch SL is formed in the column portion 17 between the pockets Pt of the cage 15, it is possible to suppress a decrease in rigidity strength of the cage 15, and centrifugal force acting on the cage 15 during the bearing operation. It is possible to prevent the cage 15 from being undesirably deformed due to the above. In addition, the lubrication reliability can be further improved by feeding the grease Gr into the outer ring grease reservoir groove 12c.

  Next, a rolling bearing according to a second embodiment of the present invention will be described with reference to FIGS. In the following description, the same reference numerals are given to portions corresponding to the matters described in the preceding forms in each embodiment, and overlapping description may be omitted. When only a part of the configuration is described, the other parts of the configuration are the same as those described in the preceding section. Not only the combination of the parts specifically described in each embodiment, but also the embodiments can be partially combined as long as the combination does not hinder.

  The rolling bearing 10 </ b> A according to the second embodiment includes an inner ring 11, an outer ring 12, a ball 13, a cage 15 </ b> A, and a seal 14. The bearing space between the inner ring 11 and the outer ring 12 is sealed with the seal 14 and used for grease lubrication. The cage 15 </ b> A is made of, for example, a resin material and guided to the inner peripheral surface of the outer ring 12.

Next, the feeding part of the cage 15A will be described.
Through holes HL as feed portions for feeding the grease Gr are formed from both sides in the width direction of the cage outer diameter surface Hd2 to the cage end surface Ht. A plurality of through holes HL of the cage 15A are formed at regular intervals in the circumferential direction as shown in FIG. Further, in the cage 15A, one end in the axial direction, that is, the plurality of through holes HL at the right end in FIG. 3, and the other through end in the axial direction, that is, the plurality of through holes HL in the left end in FIG. Are formed at the same phase, i.e., at the same left and right positions in FIG. Further, as shown in FIG. 3B, the left and right through holes HL are disposed at positions in the columnar portion 17 between the pockets Pt adjacent in the circumferential direction in the retainer 15A. .

  Each through hole HL is a so-called straight hole having an inclination angle α toward the center in the width direction of the cage as it goes from the axial end of the cage 15A to the outer diameter surface of the cage. For example, it is set to about 45 degrees with respect to the axis L1. Further, as shown in FIG. 3B, each through hole HL is formed in an elliptical shape having a long hole slightly longer in the axial direction than in the circumferential direction in plan view. Of each through hole HL of the cage 15A, the portion that opens to the cage outer diameter surface Hd2 is disposed at a position facing the outer ring grease retaining groove 12c. Further, a portion of each through hole HL of the cage 15A that opens to the cage end surface Ht is disposed in the vicinity of the middle between the cage outer diameter Hd2 and the cage inner diameter Hd1.

  Of the through holes HL of the retainer 15A, the axial position between the innermost portion in the axial direction in the portion opened to the outer diameter surface of the retainer and the inner wall portion of the retainer 15A with the column width HW Are defined to be substantially the same position. Further, since the through hole HL of the cage 15A is formed in an elliptical shape having a long hole that is slightly longer in the axial direction as described above, the portion that is the innermost position of each through hole HL is replaced with the ball 13. Since it can be necessary and sufficiently separated from the pocket Pt to be held, a decrease in the rigidity strength of the cage 15A can be suppressed.

  According to the rolling bearing 10A according to the second embodiment, the grease Gr is sealed in the through hole HL of the outer ring guide type cage 15A, and the grease is inserted into the outer ring grease retaining groove 12C via the through hole HL. Send Gr. Therefore, it is possible to suppress heat generation by suppressing the stirring resistance associated with the movement of the grease, as compared with the conventional technique in which the grease is moved from the inner diameter of the cage to a stationary space including the grease reservoir of the outer ring. Other operations and effects similar to those of the first embodiment are exhibited.

In the present embodiment, a non-contact type seal is applied. However, the present invention is not limited to this non-contact type seal, and a contact type seal may be applied depending on the use conditions of the bearing.
As disclosed in the present embodiment, it is desirable to form an outer ring grease reservoir groove on the inner peripheral surface of the outer ring near the both sides in the axial direction of the raceway groove in order to improve lubrication reliability. However, this outer ring grease reservoir groove is formed. It is also possible to adopt a structure that does not.
In the second embodiment shown in FIGS. 3 and 4, in order to form a through-hole having a tilt angle α of the cage, a shaft of the through-hole is formed in a portion opened to the outer diameter surface of the cage or a portion opened to the end surface of the cage. A seat surface perpendicular to the direction may be formed. In this case, it is possible to reliably and quickly form the through hole having the inclination angle α.

  As another form of the feeding portion of the cage, for example, at least one of a concave and convex shape, a corrugated shape, and a gear shape in which the concave shape portion and the convex shape portion are continuous in the circumferential direction may be adopted. Since such a shape can be integrally formed by, for example, injection molding or the like, it is not necessary to form a feeding portion by machining, and the number of processing steps can be reduced. Other operations and effects similar to those of the present embodiment are exhibited.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure showing the rolling bearing which concerns on 1st Embodiment of this invention, Fig.1 (a) is sectional drawing of this rolling bearing, FIG.1 (b) is the top view which fractured | ruptured partially the holder | retainer of the rolling bearing. It is. It is a principal part enlarged view of the holder | retainer etc. It is a figure showing the rolling bearing which concerns on 2nd Embodiment of this invention, Fig.3 (a) is sectional drawing of this rolling bearing, FIG.3 (b) is a partially broken top view of the holder | retainer of this rolling bearing. It is. It is a principal part enlarged view of the holder | retainer etc. It is a figure showing the conventional rolling bearing, Fig.5 (a) is sectional drawing of this rolling bearing, FIG.5 (b) is the partially broken top view of the holder | retainer of the rolling bearing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 10A ... Rolling bearing 11 ... Inner ring 12 ... Outer ring 12c ... Outer ring grease retaining groove 12n ... Outer ring inner peripheral surface 13 ... Ball 14 ... Seal 15, 15A ... Retainer 17 ... Notch Pt ... Notch Pt ... Pocket HL ... Through Hole Gr ... Grease Hd2 ... Outer diameter surface of cage Ht ... End surface of cage

Claims (5)

In a rolling bearing in which a ball held by a cage is interposed between an inner ring and an outer ring, and a bearing space between the inner ring and the outer ring is sealed with a seal.
The cage is guided to the inner peripheral surface of the outer ring, and the grease is fed into the inner peripheral surface of the outer ring from the outer diameter surface of the cage guided by the inner peripheral surface to the end surface of the cage. A rolling bearing characterized in that a feed portion is provided.   The rolling bearing according to claim 1, wherein the feeding portion is provided at a plurality of locations in the circumferential direction and is a notch extending from the outer diameter surface of the cage to the end surface of the cage.   The outer ring grease retaining groove that is recessed radially outward is formed on the inner peripheral surface of the outer ring according to claim 2, and a plurality of notches of the cage are formed at regular intervals in the circumferential direction. A rolling bearing in which these notches are formed in pillars between pockets that hold balls and are adjacent in the circumferential direction.   The rolling bearing according to claim 1, wherein the feeding part is a through hole provided at a plurality of locations in a circumferential direction and extending from an outer diameter surface of the cage to an end surface of the cage.   5. The outer ring grease retaining groove that is recessed radially outward is formed on the inner circumferential surface of the outer ring, and a plurality of through holes of the cage are formed at regular intervals in the circumferential direction. A rolling bearing in which these through holes are formed in a pillar portion between pockets which are pockets for holding balls and which are adjacent in the circumferential direction.

Images