JP2015206392A - Roller bearing with cage-shaped holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller bearing with a cage-shaped holder, capable of easily manufacturing the holder and enhancing lubrication performance to improve abrasion resistance.SOLUTION: A pillar part 21 of a cage-shaped holder 20 and annular parts 22, 23 on a large-diameter side and a small-diameter side of the cage-shaped holder respectively includes contact surfaces 21a, 22a, 23a on which a conical roller 13 contacts, and non-contact surfaces 21b, 22b, 23b that continue to the contact surfaces 21a, 22a, 23a in a radial direction and are inclined in a direction away from the conical roller 13, and on which the conical roller 13 does not contact.

Description

  The present invention relates to a roller bearing with a cage cage, and in particular, as a support for a rotating shaft of machinery equipment in almost all industries, as in the case of conventional cage bearings, machined and pin type roller bearings. The present invention relates to a roller bearing with a cage cage.

  For example, most conventional cages used for tapered roller bearings are made of metal or resin, and are of a cage shape, a machined shape, or a pin type. Among them, a press-molded cage retainer as shown in FIG. 4 is most frequently used. Such a cage-type cage 100 has a pillar portion 101 that holds a tapered roller (not shown) in each pocket P on both sides in the circumferential direction, and a large diameter that holds the head of the tapered roller on one side in the axial direction. A side annular portion 102 and a small-diameter side annular portion 103 that holds the tail portion of the tapered roller on the other side in the axial direction are provided. Further, the large-diameter-side annular portion 102 and the small-diameter-side annular portion 103 have planes 102a and 103a constituting the pocket P formed in a planar shape. Furthermore, as shown in FIG. 4 (b), the outer diameter side of the surface 101a of the column part 101 with which the transfer surface of the tapered roller contacts is inclined in a direction away from the tapered roller, and the height at which the tapered roller does not contact. A non-contact surface 101b at t1 is provided.

  When the conventional tapered roller bearing rotates, the tapered roller has a surface 101 a of the column portion 101 in the pocket P of the cage 100, a surface 102 a of the large-diameter side annular portion 102, and a surface 103 a of the small-diameter side annular portion 103. Rotating and revolving while touching and sliding. If an oil film is not formed or cut off at these contact portions, wear due to contact between the metals, particularly wear of the relatively soft cage increases.

  Furthermore, for example, when a tapered roller bearing is applied to a gear device of a railway vehicle, vibration and impact are significant, and since it is used at high speed rotation, the viscosity of the lubricating oil decreases due to high temperature. For this reason, there has been a problem that the contact surface with the roller of the cage pocket that is sliding while being repeatedly struck repeatedly, particularly the surface of the large-diameter side annular portion and the surface of the small-diameter side annular portion are significantly worn. . This phenomenon frequently occurs particularly in the medium-gradient or steep-gradient (contact angle is, for example, 14 to 30 °) tapered roller bearings used in the above-described gear device small gear shaft.

  In the tapered roller bearing described in Patent Document 1, the large-diameter side annular portion of each pocket of the cage includes a concave cylindrical surface having a curvature larger than the curvature of the large-diameter end surface of each tapered roller, and the large-diameter side annular ring The contact area between the portion and the large-diameter side end surface is increased to reduce the contact surface pressure at the site.

  Moreover, in the roller bearing cage described in Patent Document 2, the peripheral portion of the pocket hole is relatively thickened by removing the region excluding the entire peripheral portion of the pocket hole so as to be thinned. Thus, the fatigue fracture resistance of the pocket hole peripheral portion is improved while reducing the weight.

JP 2003-294038 A Japanese Patent No. 2007-92766

By the way, in the tapered roller bearing described in Patent Document 1, it is necessary to process both the large-diameter side end surface of the tapered roller and the surface of the large-diameter side annular portion of the cage into curved surfaces, which makes the production complicated. There are challenges.
Further, in the roller bearing described in Patent Document 2, the surface of the large-diameter side annular portion and the surface of the small-diameter side annular portion are formed in a flat shape, and as described above, no oil film is formed on the contact portion. There is a problem that the processing of the cage is complicated.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object of the present invention is to provide cage bearings with cage cages that can easily manufacture cages, improve lubrication performance, and improve wear resistance. Is to provide.

The above object of the present invention can be achieved by the following constitution.
(1) outer ring,
Inner ring,
A plurality of rollers disposed between both raceways of the outer ring and the inner ring;
A cage-type cage comprising a plurality of pillar portions provided at predetermined intervals in the circumferential direction, and a pair of annular portions respectively connecting axial end portions of the plurality of pillar portions;
A roller bearing with a cage cage having
The column part and the pair of ring parts are contacted with the roller, a non-contact surface that is continuous with the contact surface in the radial direction, is inclined in a direction away from the roller, and does not contact the roller. A roller bearing with a cage-type cage, wherein each is formed.
(2) The inclination angle of the non-contact surface with respect to the contact surface in the pair of annular portions is set to 1 ° to 10 °,
The non-contact surface in the pair of annular portions is set to be 1/5 to 1/3 of the plate thickness of the cage, or lower than the height of the non-contact surface of the column portion. A roller bearing with a cage cage as described in (1).
(3) The roller is a tapered roller or a spherical roller,
The cage retainer includes the plurality of column portions, the small-diameter-side annular portion, and the large-diameter-side annular portion,
The large-diameter side annular portion is formed such that the non-contact surface is radially outward from the contact surface,
The roller bearing with a cage-type cage according to (1) or (2), wherein the small-diameter-side annular portion has the non-contact surface formed radially inward of the contact surface.

  According to the roller bearing with a cage retainer of the present invention, the pillar portion and the pair of annular portions of the cage retainer are in contact with the roller, and the contact surface is continuous with the contact surface in the radial direction. A non-contact surface that is inclined in a direction away from the roller and is not in contact with the roller is formed. Therefore, a wedge-shaped lubricant reservoir is formed between the end surface of the roller and the non-contact surface of the annular portion, and the lubricant is supplied from the lubricant reservoir between the end surface of the roller and the contact surface. An oil film is formed. Thereby, while it is easy to manufacture the cage, the lubrication performance can be improved and the wear resistance can be improved.

It is sectional drawing of the tapered roller bearing with a cage type cage which concerns on 1st Embodiment of this invention. (A) is a cross-sectional view of the cage retainer of FIG. 1, omitting the back pocket, (b) is a cross-sectional view taken along line II-II, and (c) is an enlarged view of II ′ portion. (D) is an II "part enlarged view. It is sectional drawing of the self-aligning roller bearing with a cage retainer which concerns on 2nd Embodiment of this invention. (A) is sectional drawing of the conventional cage-shaped cage which abbreviate | omitted the back side pocket, (b) is sectional drawing in the IV-IV line.

  Hereinafter, a cage-type roller bearing with cage according to each embodiment of the present invention will be described in detail based on the drawings.

(First embodiment)
As shown in FIG. 1, a roller bearing 10 with a cage cage according to this embodiment is a tapered roller bearing, and includes an outer ring 11 having a conical outer ring raceway surface 11a on an inner peripheral surface and a conical shape on an outer peripheral surface. An inner ring 12 having an inner ring raceway surface 12a, having a small flange portion 12b on the small diameter side and a large flange portion 12c on the large diameter side, and is disposed between the outer ring raceway surface 11a and the inner ring raceway surface 12a. A plurality of tapered rollers 13 and a cage retainer 20 that holds the tapered rollers at equal intervals in the circumferential direction.

  As shown in FIG. 2, the cage retainer 20 includes a plurality of columnar portions 21 provided at predetermined intervals in the circumferential direction, and a large-diameter side circle that connects both axial ends of the plurality of columnar portions 21. An annular portion 22 and a small-diameter-side annular portion 23. The adjacent column portions 21, 21, the large-diameter-side annular portion 22, and the small-diameter-side annular portion 23 define a pocket P that holds the tapered rollers 13.

  As shown in FIG. 2A, the cage retainer 20 has a substantially uniform plate thickness t from the large-diameter side annular portion 22 to the column portion 21 and the small-diameter side annular portion 23, and is substantially linear. The small-diameter-side annular portion 23 is curved inward in the radial direction and extends to the tip portion.

  As shown in FIG. 2B, the circumferential end surface of the column portion 21 defining the pocket P is continuous with the contact surface 21a with which the transfer surface of the tapered roller 13 contacts, and the contact surface 21a on the radially outer side. And a non-contact surface 21b which is inclined in a direction away from the tapered roller 13 and does not contact the tapered roller 13.

  Further, as shown in FIG. 2C, the axial end surface of the large-diameter side annular portion 22 that defines the pocket P is in contact with the contact surface 22a that the head that is the end surface of the tapered roller 13 contacts. It has a non-contact surface 22b that is continuous with the surface 22a on the radially outer side, is inclined in a direction away from the tapered roller 13, and does not contact the tapered roller 13. The non-contact surface 22b of the large-diameter side annular portion 22 has an inclination angle Φ of 1 ° to 10 ° with respect to the contact surface 22a, and the height a1 of the non-contact surface 22b is the thickness of the cage 20. It is set to 1/5 to 1/3 of t, or the height t1 or less of the non-contact surface 21b of the column portion 21.

Further, as shown in FIG. 2 (d), the axial end surface of the small-diameter-side annular portion 23 that defines the pocket P is contacted with a contact surface 23a that contacts a tail portion that is an end surface of the tapered roller 13, and a contact surface 23a. And a non-contact surface 23b that is continuous inward in the radial direction, is inclined in a direction away from the tapered roller 13, and does not contact the tapered roller 13. The non-contact surface 23b of the small-diameter side annular portion 23 has an inclination angle Φ of 1 ° to 10 ° with respect to the contact surface 23a, and the height a2 of the non-contact surface 23b is the thickness t of the cage 20. 1/5 to 1/3, or the height t1 or less of the non-contact surface 21b of the column portion 21 is set.
The contact surfaces 21a, 22a, 23a and the non-contact surfaces 21b, 22b, 23b are all flat surfaces, but the boundary portions between the contact surfaces 21a, 22a, 23a and the non-contact surfaces 21b, 22b, 23b are Curved smoothly to prevent burrs.
In the present embodiment, the heights a1 and a2 of the non-contact surfaces 22b and 23b are set equal to the height t1 of the non-contact surface 21b of the column portion 21.
Furthermore, the contact surfaces 22b and 23b of the large-diameter side annular portion 22 and the small-diameter side annular portion 23 are formed substantially parallel to the opposing end surfaces of the head or tail portion of the tapered roller.

Therefore, a wedge-shaped lubricant reservoir G is formed between the head end surface and tail end surface of the tapered roller 13 and the non-contact surfaces 22b and 23b of the large diameter side and small diameter side annular portions 22 and 23, respectively. An oil film is always formed by supplying a lubricant such as oil or grease from the lubricant reservoir G between the head end face or tail end face of the tapered roller 13 and the contact faces 22a, 23a. Thereby, lubrication performance can be improved and the wear resistance of the pocket P of the cage 20 can be improved.
In particular, when the tapered roller bearing of the present embodiment is incorporated in a railway vehicle or the like, it is more effective during the initial operation in winter.

  Note that the material of the cage retainer 20 of the present embodiment is arbitrary, and may be made of metal or resin. In particular, when the cage-shaped cage 20 having the above-described shape is made of metal, it can be easily molded by pressing and can be easily molded by shaving. Also, in the case of resin, the mold structure is very simple and can be easily cast.

Further, the corner radius R (see FIG. 2A) that connects the large-diameter side and small-diameter side annular portions 22, 23 and the column portion 21 in a curved surface has a larger radius of curvature than the conventional one, and is formed by press molding. Since plastic deformation or stress concentration hardly occurs, the stress at the corner R is smaller than that of the conventional one, and the strength of the cage 20 can be improved.
Further, the head end face and tail end face of the tapered roller 13 may be flat or may be formed as a convex curved surface.

  As described above, according to the tapered roller bearing 10 of the present embodiment, the tapered roller 13 is in contact with the column part 21 and the large diameter side and small diameter side annular parts 22 and 23 of the cage retainer 20. Contact surfaces 21a, 22a, and 23a, non-contact surfaces 21b, 22b, and 23b that are continuous with the contact surfaces 21a, 22a, and 23a in the radial direction, are inclined in a direction away from the tapered rollers 13, and do not contact the tapered rollers 13. Are formed respectively. Therefore, a wedge-shaped lubricant reservoir G is formed between the end surface of the tapered roller 13 and the non-contact surfaces 22b, 23b of the annular portions 22, 23, and the end surface of the tapered roller 13 and the contact surfaces 22a, 23a In the meantime, the lubricant is supplied from the lubricant reservoir G to form an oil film. Thereby, although manufacture of the holder | retainer 20 is easy, lubrication performance can be improved and abrasion resistance can be improved.

  In addition, the inclination angle Φ of the non-contact surfaces 22b and 23b with respect to the contact surfaces 22a and 23a in the large-diameter side and small-diameter side annular portions 22 and 23 is set to 1 ° to 10 °. Since the non-contact surfaces 22b and 23b in the portions 22 and 23 are set to 1/5 to 1/3 of the plate thickness t of the cage 20, or the height t1 of the non-contact surface 21b of the column portion 21, A wedge-shaped lubricant reservoir G is more reliably formed between the end surface of the tapered roller 13 and the non-contact surfaces 22b and 23b of the annular portions 22 and 23, and the end surface of the tapered roller 13 and the contact surfaces 22a and 23a. The lubricant can be supplied from the lubricant reservoir G so that there is no loss of the oil film therebetween.

  Further, in the large-diameter side annular portion 22, the non-contact surface 22b is formed radially outside the contact surface 22a, and in the small-diameter side annular portion 23, the non-contact surface 23b is radially inward of the contact surface 23a. It is formed. This is because, for example, when the tapered roller bearing 10 is used in a bearing box (not shown) such as for a railway vehicle, the oil in the bearing box moves upward as shown by an arrow A in FIG. And is poured from above the bearing. Therefore, oil is supplied to a portion of the lubricant reservoir G located above the large-diameter side annular portion 22, and oil is supplied to a portion of the lubricant reservoir G located below the small-diameter side annular portion 23. Is done. If a non-contact surface is provided on the outer peripheral surface side of both the large-diameter-side annular portion 22 and the small-diameter-side annular portion 23, the small-diameter-side annular portion 23 side is caused by the conical shape of the tapered roller bearing 10. It is assumed that the oil supply is not sufficient. Further, if a non-contact surface is provided on the inner peripheral surface side in both the large diameter side annular portion 22 and the small diameter side annular portion 23, the large diameter side circle is caused by the conical shape of the tapered roller bearing 10. It is assumed that the oil replenishment is not sufficient on the ring portion 22 side. Therefore, by providing the non-contact surface 22b on the outer peripheral surface side of the large-diameter side annular portion 22 and providing the non-contact surface 23b on the inner peripheral surface side of the small-diameter side annular portion 23, the oil film can be effectively retained. Can do.

  FIG. 3 is a sectional view showing a self-aligning roller bearing according to a second embodiment of the present invention. The self-aligning roller bearing 10a includes an outer ring 11 having an outer ring raceway surface 11a, which is a spherical concave surface having a single center on the inner peripheral surface, and a pair of outer ring raceways that face the outer ring raceway surface 11a on both sides in the width direction. A plurality of spherical rollers 13a, 13a arranged in two rows to freely roll between the inner ring 12 having the inner ring raceway surfaces 12a, 12a, the outer ring raceway surface 11a and the pair of inner ring raceway surfaces 12a, 12a, A pair of cage-shaped cages 20 that hold the rows of spherical rollers 13a, 13a at equal intervals in the circumferential direction are provided.

Each cage retainer 20 includes a plurality of column portions 21 provided at predetermined intervals in the circumferential direction, and a large-diameter-side annular portion 22 and a small-diameter side that respectively connect axial ends of the plurality of column portions 21. In the same manner as in the first embodiment, the pillar portion 21 and the large-diameter side and small-diameter side annular portions 22 and 23 are in contact with the spherical roller 13a, and the contact surface. It is continuous in the radial direction (that is, radially outward in the column portion 21 and the large-diameter side annular portion 22, and radially inward in the small-diameter side annular portion 23), and is inclined in a direction away from the spherical roller 13a. Non-contact surfaces that do not contact each other are formed.
The cage retainer 20 of the present embodiment is formed with a uniform thickness from the large-diameter side annular part to the small-diameter side annular part 23 via the column part 21 and curved in the radial direction. Yes.

Therefore, also in the self-aligning roller bearing 10a of this embodiment, like the first embodiment, the pocket P of the cage 20, that is, the circumferential end surface of the column portion 21, the large diameter side, and the small diameter side annular portion. By forming the end faces 22 and 23 in the axial direction, the cage 20 can be easily manufactured, but the lubrication performance can be improved and the wear resistance can be improved.
Other configurations and operations are the same as those in the first embodiment.

  Note that the present invention is not limited to the above-described embodiments and modifications, and modifications, improvements, and the like can be made as appropriate.

10 Tapered roller bearings (Roller bearings)
10a Spherical roller bearing (Roller bearing)
DESCRIPTION OF SYMBOLS 11 Outer ring 12 Inner ring 13 Tapered roller 13a Spherical roller 20 Cage type cage 21 Pillar part 22 Large diameter side annular part 23 Small diameter side annular part P Pocket

Claims (3)

Outer ring,
Inner ring,
A plurality of rollers disposed between both raceways of the outer ring and the inner ring;
A cage-type cage comprising a plurality of pillar portions provided at predetermined intervals in the circumferential direction, and a pair of annular portions respectively connecting axial end portions of the plurality of pillar portions;
A roller bearing with a cage cage having
The column part and the pair of ring parts are contacted with the roller, a non-contact surface that is continuous with the contact surface in the radial direction, is inclined in a direction away from the roller, and does not contact the roller. A roller bearing with a cage-type cage, wherein each is formed. An inclination angle of the non-contact surface with respect to the contact surface in the pair of annular portions is set to 1 ° to 10 °,
The non-contact surface in the pair of annular portions is set to be 1/5 to 1/3 of the plate thickness of the cage, or lower than the height of the non-contact surface of the column portion. A roller bearing with a cage-type cage according to claim 1. The roller is a tapered roller or a spherical roller,
The cage retainer includes the plurality of column portions, the small-diameter-side annular portion, and the large-diameter-side annular portion,
The large-diameter side annular portion is formed such that the non-contact surface is radially outward from the contact surface,
The roller bearing with a cage-type cage according to claim 1 or 2, wherein the non-contact surface of the small-diameter side annular portion is formed radially inward of the contact surface.

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