JP2015102131A - Split type cage for tapered roller bearing, and tapered roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a split type holder for a conical roller bearing capable of preventing holder segments neighboring in a circumferential direction from being bonded with surface tension of grease, and reducing impact due to collision of the holder segments.SOLUTION: In a split type holder 14 for a conical roller bearing 10 where plural holder segments 20 storing a conical roller 13 are arrayed in an annular shape in a circumferential direction, each holder segment 20 has an opposite surface 20a opposite to another holder segment 20 neighboring in the circumferential direction, and at least one of the opposite surfaces 20a opposite to each other includes a structure that is partially contactable with respect to the other surface.

Description

  The present invention relates to a split cage for a tapered roller bearing in which a plurality of cage segments are arranged in an annular shape, and a tapered roller bearing.

  Conventionally, in a horizontal axis propeller-type wind power generator, a rolling bearing is used to rotatably support a main shaft to which a blade is attached. In recent years, with the increase in the size of wind power generators, the diameter of the main shaft may exceed several meters, and the rolling bearing is also increased in size to support such a large main shaft. As a cage used for a large-sized rolling bearing, a synthetic resin cage may be used. This cage made of synthetic resin is advantageous in that it is lightweight and easy to ensure accuracy compared to a metal cage assembled by welding. However, it is difficult to integrally mold a cage made of a synthetic resin having a large diameter by injection molding. In view of this, a split type retainer configured by annularly arranging a plurality of retainer segments that accommodate rolling elements is used (see, for example, Patent Document 1).

  The cage segment described in Patent Document 1 includes a pair of first and second rim portions that are opposed to each other with a predetermined distance in the axial direction, and a plurality of column portions that are laid between the first and second rim portions. The space surrounded by the adjacent column portion and the first and second rim portions is a pocket that accommodates a tapered roller as a rolling element. The cage segment described in Patent Document 1 includes five column portions arranged in the circumferential direction, and tapered rollers are accommodated in four pockets formed between the respective column portions.

European Patent Publication EP 2264325 (A1)

  Tapered roller bearings have a load zone that receives a radial load from the shaft and other anti-load zones when axial load is not applied.Each cage segment and tapered roller is accompanied by the rotation of the shaft. Move sequentially between the load zone and the anti-load zone. And, for example, when the lower area of the tapered roller bearing is a load area of radial load and the upper area is an anti-load area, the cage segment on the load area side moves from the load area to the anti-load area. This is done by pushing up the cage segment on the anti-load zone side, and after passing through the top of the anti-load zone, the cage segment falls toward the load zone side by its own weight.

  However, since the cage segment described in Patent Document 1 also increases in weight by accommodating four tapered rollers, when the cage segment falls toward the load zone side, other cages arranged below the cage segment There is a high possibility that the segment will collide strongly and be damaged by the impact.

On the other hand, in order to reduce such an impact, it is conceivable to reduce the number of tapered rollers accommodated in each cage segment (for example, one) and reduce the individual weight.
However, in this case as well, for example, as shown in FIG. 10, if the adjacent cage segments 20 </ b> A are bonded to each other due to the surface tension of the grease supplied to the tapered roller bearing 10, they are gathered together as an arrow. It falls in the X direction and collides with the lower cage segment 20B. As a result, the impact cannot be reduced.

  The present invention has been made in view of the circumstances as described above, and prevents the cage segments adjacent in the circumferential direction from adhering to each other due to the surface tension of the grease. An object of the present invention is to provide a split cage for a tapered roller bearing that can be relaxed, and a tapered roller bearing.

  The present invention is a split-type cage for tapered roller bearings in which a plurality of cage segments for accommodating tapered rollers are arranged in an annular shape along the circumferential direction, and each of the cage segments is adjacent to the circumferential direction. The retainer segments have a facing surface, and at least one of the facing surfaces facing each other has a structure that can abut against the other at a part thereof.

  According to the above configuration, at least one of the opposing surfaces of the cage segments adjacent to each other in the circumferential direction has a structure that can abut against the other part of the opposing surfaces. Are not in contact with the entire surface, and are hardly bonded by the surface tension of grease. For this reason, it is possible to prevent the plurality of cage segments from dropping together in the anti-load zone of the radial load, and to reduce the impact caused by the collision of the cage segments.

It is preferable that the one opposing surface includes a protrusion that protrudes toward the other opposing surface and that has a tip that can contact the other opposing surface.
With such a configuration, it is possible to easily realize a structure in which the one facing surface can abut against the other facing surface at a part thereof.

It is preferable that the protrusion is in point contact or line contact with the other facing surface.
With such a configuration, the contact area between the opposing surfaces facing each other can be made as small as possible, and adhesion due to the surface tension of the grease can be more reliably prevented.

Each of the cage segments has a plurality of pillars arranged side by side in the circumferential direction, and a rim part that connects axial ends of the pillars, and the protrusions are related to the axial direction. Preferably, the rim portion is formed so as to overlap the thickness range.
With such a configuration, it is possible to reduce a burden on the column portion when the protruding portion is in contact with the other facing surface, and it is possible to suppress damage to the column portion.

Each of the cage segments preferably has one pocket for accommodating one tapered roller.
With such a configuration, each cage segment can be reduced in weight, and the impact when colliding with another cage segment can be suitably mitigated.

  The tapered roller bearing of the present invention is capable of rolling between an inner ring having an inner ring raceway surface, an outer ring having an outer ring raceway surface disposed radially outward of the inner ring, and the inner ring raceway surface and the outer ring raceway surface. And a plurality of tapered rollers arranged in the above, and the above-mentioned split type retainer that holds the interval between the plurality of tapered rollers.

  According to the split type cage of the present invention, it is possible to prevent the cage segments adjacent in the circumferential direction from adhering to each other with grease, and to reduce the impact caused by the collision of the cage segments.

It is a side view which shows schematically the tapered roller bearing which employ | adopted the split-type cage which concerns on the 1st Embodiment of this invention. It is a longitudinal cross-sectional view of a part of the tapered roller bearing shown in FIG. It is a plane explanatory view of a cage segment. It is side surface explanatory drawing of a holder | retainer segment. It is a perspective view of a holder | retainer segment. It is a plane explanatory view of the cage segment of the split type cage concerning the 2nd embodiment of the present invention. It is a plane explanatory view of a cage segment of a split type cage concerning a 3rd embodiment of the present invention. It is a plane explanatory view of the cage segment of the split type cage concerning the 4th embodiment of the present invention. It is a plane explanatory view of the cage segment of the split type cage concerning the 5th embodiment of the present invention. It is side surface explanatory drawing which shows a mode that a several holder | retainer segment falls from an anti-load zone to the load zone side.

Hereinafter, embodiments of the split-type cage of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a side view schematically showing a tapered roller bearing employing the split cage according to the first embodiment of the present invention, and FIG. 2 is a longitudinal section of a part of the tapered roller bearing shown in FIG. FIG.
The tapered roller bearing 10 of the present embodiment is a large-sized one used for supporting a main shaft of a wind power generator, for example, and includes an annular inner ring 11 and an outer ring 12, a plurality of tapered rollers 13, and a cage 14. ing.

An inner ring raceway surface 11 a is formed on the outer periphery of the inner ring 11. An outer ring raceway surface 12 a is formed on the inner periphery of the outer ring 12. The plurality of tapered rollers 13 are configured to roll on the inner ring raceway surface 11a and the outer ring raceway surface 12a. The cage 14 holds the circumferential interval between the plurality of tapered rollers 13.
The cage 14 of the present embodiment is a split type cage composed of a plurality of cage segments 20. In FIG. 1, all the cage segments 20 are shown in close contact with each other. In practice, however, a gap is formed between adjacent cage segments 20 in the whole or a part of the circumferential direction. It has come to be.

3 is an explanatory plan view of the cage segment 20, FIG. 4 is an explanatory side view thereof, and FIG. 5 is a perspective view thereof.
Each cage segment 20 constituting the cage 14 is constructed between a pair of column portions 21 opposed to each other at a predetermined interval in the circumferential direction and the column portions 21, and the axial direction of the pair of column portions 21. And a pair of rim portions 22 that connect the end portions of each other. Both the column portion 21 and the rim portion 22 are formed in a plate shape having flat inner and outer surfaces. Therefore, the cage segment 20 is formed in a rectangular frame shape in plan view. A single space surrounded by the pair of column portions 21 and the pair of rim portions 22 is configured as a pocket 23 for accommodating one tapered roller 13.

  Further, convex portions 24 projecting in the radial direction are formed on the radially outer and inner surfaces of each column portion 21. The convex portion 24 is in sliding contact with the inner peripheral surface of the outer ring 12 and the outer peripheral surface of the inner ring 11, whereby the cage segment 20 is positioned in the radial direction. The cage segment 20 is made of synthetic resin and is integrally formed by injection molding or the like.

  The tapered roller bearing 10 of the present embodiment having the above-described configuration has a load zone that receives a radial load from the main shaft and an anti-load zone other than that when no axial load is applied. The cage segments 20 and the tapered rollers 13 sequentially move between the load area of the radial load and the anti-load area as the main shaft rotates. Then, for example, when the lower region of the tapered roller bearing 10 is a radial load region and the upper region is an anti-load region, the cage segment 20 moves from the load region to the anti-load region. The segment 20 is formed by pushing up the cage segment 20 on the anti-load zone side. When the segment 20 passes the uppermost portion of the anti-load zone, the cage segment 20 falls toward the load zone side by its own weight.

  At this time, when the tapered roller bearing 10 is grease-lubricated, as shown in FIG. 10, a plurality of cage segments (indicated by reference numeral 20A) arranged in the anti-load zone are bonded by the surface tension of the grease, It may fall in the direction of the arrow X toward the load zone so as to fill the gap S1 in a collective state. When the plurality of cage segments 20A are dropped together as described above, the cage segments 20A and 20B may be damaged by the impact due to a strong collision with the cage segment (indicated by reference numeral 20B) disposed on the lower side. is there.

  In particular, in this embodiment, as shown in FIG. 3, since one tapered roller 13 is accommodated in one cage segment 20, the total number of cage segments 20 is increased, and each cage segment is increased. The thickness of the 20 column portions 21 must be reduced. Therefore, the strength of the column portion 21 is reduced, and the possibility of damage is increased.

  Therefore, in the present embodiment, the following configuration is employed in order to prevent the plurality of cage segments 20 from adhering due to the surface tension of the grease. That is, the cage segment 20 of the present embodiment has a facing surface 20a facing the other cage segment 20 adjacent in the circumferential direction, and at least one of the facing surfaces 20a facing each other is in relation to the other. , A part of which can be contacted.

Specifically, in the present embodiment, a protrusion 30 that protrudes toward the facing surface 20 a of another adjacent cage segment 20 is provided on one circumferential surface 20 a of the cage segment 20.
Two protrusions 30 are provided so as to overlap both ends of the opposing surface 20a in the axial direction, specifically, the range of the thickness t (see FIG. 3) of the rim portion 22 in the axial direction. The tip of the protrusion 30 is formed in a spherical shape. And the protrusion part 30 contact | abuts the opposing surface 20a of the other holder | retainer segment 20 adjacent to the circumferential direction, and the opposing surfaces 20a do not contact in the whole surface, but a clearance gap is formed in most between the opposing surfaces 20a. Is done.

  With such a configuration, it is possible to prevent the cage segments 20 adjacent to each other in the circumferential direction from adhering to each other due to the surface tension of the grease. The segments 20 can be dropped one by one. Thereby, the impact when the dropped cage segment 20 collides with the cage segment 20 disposed on the lower side can be reduced, and damage can be prevented.

In addition, since the protrusion 30 is formed so as to overlap with the range of the thickness t of the rim portion 22, the burden on the pillar portion 21 when contacting the opposing surface 20 a of the adjacent cage segment 20. This can be reduced and damage to the column portion 21 can be prevented.
Moreover, since the protrusion part 30 is formed in the spherical shape at the tip part, it can make point contact with the opposing surface 20a of the adjacent cage segment 20, and the contact area can be made as small as possible. Thereby, it can prevent more reliably that adjacent cage | basket segment 20 adheres with the surface tension of grease.

FIG. 6 is an explanatory plan view of the cage segment 20 of the split cage according to the second embodiment of the present invention.
In the cage segment 20 of the present embodiment, three pillar portions 21 are arranged in the circumferential direction, and two pockets 23 are formed between the pillar portions 21 and the pair of rim portions 22. Then, a protrusion 30 substantially the same as that of the first embodiment is formed on one end surface (opposing surface 20a) in the circumferential direction. Therefore, also in this embodiment, there exists an effect similar to 1st Embodiment.

FIG. 7 is an explanatory plan view of the cage segment 20 of the split cage according to the third embodiment of the present invention.
In the present embodiment, protrusions 30 are formed on both end surfaces of the cage segment 20 in the circumferential direction. Specifically, two projecting portions 30 are formed on one end surface as in the first embodiment, and one projecting portion 30 is formed on the other end surface at the central portion in the axial direction of the column portion 21. Is formed. Each protrusion 30 is formed at the same height. Accordingly, the two retainer segments 20 adjacent in the circumferential direction can simultaneously abut the opposing projecting surface 20a of the protrusions 30. Also in this embodiment, there exists an effect similar to the said 1st Embodiment.

FIG. 8 is an explanatory plan view of the cage segment 20 of the split cage according to the fourth embodiment of the present invention.
In the present embodiment, a protrusion 30 is formed on the column portion 21 on one end surface in the circumferential direction of the cage segment 20. Two protrusions 30 are formed at symmetrical positions with respect to the axial center of the column part 21. In the present embodiment, the same effects as those of the first embodiment are obtained except that when the adjacent cage segments 20 come into contact with each other, the burden on the column portion 21 increases. Moreover, when the two protrusion parts 30 are formed side by side in the axial direction, when adjacent cage segments 20 abut against each other, they can be prevented from being inclined in the circumferential direction.

FIG. 9 is an explanatory plan view of the cage segment 20 of the split cage according to the fifth embodiment of the present invention.
In this embodiment, the shape of the protrusion 30 is different from that of the other embodiments. Specifically, the axially central side of one end surface 20a in the circumferential direction of the cage segment 20 is recessed in an arc shape to relatively project both ends in the axial direction, and this is used as a protrusion 30. is there. Therefore, also in the present embodiment, the facing surface 20a of the cage segment 20 can abut only partly against the facing surface 20a of another adjacent cage segment 20, which is substantially the same as in the first embodiment. Has the effect of. However, in this embodiment, since the tip surface of the protrusion 30 is flat, the contact area of the adjacent cage segment 20 to the facing surface 20a is larger than that of the first embodiment, and the grease is correspondingly increased. The possibility of bonding due to surface tension is increased.

The present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope of the invention described in the claims.
For example, in the said embodiment, although the front-end | tip of the projection part 30 is comprised so that a point contact or surface contact may be carried out to the opposing surface 20a of the adjacent holder | retainer segment 20, you may be comprised so that a line contact may be carried out. . Further, the number of the protrusions 30 formed on the facing surface 20a can be three or more.

  Further, instead of one or a plurality of protrusions 30, the entire facing surface 20 a may be formed in an uneven shape (wave shape, zigzag shape). Also in this case, the facing surface 20a is configured such that a part of the facing surface 20a can come into contact with the other facing surface 20a.

Moreover, although the cage segment 20 of the above embodiment is configured to accommodate one or two tapered rollers, it may be configured to accommodate three or more tapered rollers.
The tapered roller bearing of the present invention is not limited to the use for supporting the main shaft of the wind turbine generator, and can be used for any application.

10: Tapered roller bearing, 11: Inner ring, 11a: Inner ring raceway surface, 12: Outer ring, 12a: Outer ring raceway surface, 13: Tapered roller, 14: Split cage, 20: Cage segment, 20a: Opposing surface, 21 : Pillar, 22: rim, 23: pocket, 30: protrusion

Claims (6)

A split type retainer for tapered roller bearings in which a plurality of retainer segments for accommodating tapered rollers are annularly arranged along the circumferential direction,
Each of the cage segments has a facing surface facing another cage segment adjacent in the circumferential direction,
A split type cage for a tapered roller bearing, wherein at least one of opposing surfaces facing each other has a structure capable of contacting a part thereof with respect to the other.   2. The tapered roller bearing according to claim 1, wherein the one facing surface includes a protrusion that protrudes toward the other facing surface and has a tip that can be brought into contact with the other facing surface. Split type cage.   The split type cage for a tapered roller bearing according to claim 2, wherein the protrusion is in point contact or line contact with the other facing surface. Each retainer segment has a plurality of pillars arranged side by side in the circumferential direction, and a rim part that connects axial ends of the pillars.
The split type retainer for a tapered roller bearing according to claim 2, wherein the protrusion is formed so as to overlap with a thickness range of the rim portion with respect to the axial direction.   Each of the cage segments is a split type cage for a tapered roller bearing according to any one of claims 1 to 4, wherein the cage segment has one pocket for accommodating one tapered roller.   An inner ring having an inner ring raceway surface, an outer ring having an outer ring raceway surface arranged radially outward of the inner ring, and a plurality of tapered rollers arranged to roll between the inner ring raceway surface and the outer ring raceway surface And a split-type retainer according to any one of claims 1 to 5, which holds a distance between the plurality of tapered rollers.

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