JP2014070665A - Roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a split-type retainer for a roller bearing, in which retainer segments are prevented from being damaged by preventing collision of adjacent retainer segments due to relative movement of the adjacent retainer segments in the circumferential direction.SOLUTION: There is provided a roller bearing which is composed of an outer ring, an inner ring, a plurality of rollers disposed between the outer ring and the inner ring, and a retainer in which a plurality of pockets for housing the plurality of rollers are formed in the circumferential direction, the retainer being composed of a plurality of retainer segments divided in the circumferential direction. In the roller bearing, a recessed groove 30 recessed in the circumferential direction and axially continued, is formed at one side in the circumferential direction of the plurality of retainer segments, and an elastic member 31 is inserted into the recessed groove, so that a clearance gap S is formed in the circumferential direction between the retainer segments 2 opposed to each other, by the elastic member.

Description

  The present invention relates to a roller bearing using a plurality of cage segments as a cage.

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 size of wind power generators, the diameter of the main shaft may exceed several meters, and in order to support such a large main shaft, the rolling bearing is also increased in size. 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. Therefore, a split cage that is divided into a plurality in the circumferential direction is used (see, for example, Patent Document 1).
This divided cage is formed by annularly arranging a plurality of cage segments.

  FIG. 7 is a perspective view of an essential part showing an example of a conventional cage segment. The cage segment 100 includes a pair of first and second connecting portions 101 and 102 which are opposed to each other with a predetermined distance therebetween, and a plurality of pillar portions 103 installed between the connecting portions 101 and 102. The space surrounded by the adjacent pillar portion 103 and each of the connecting portions 101 and 102 is configured as a pocket 104 that accommodates a tapered roller (not shown) as a rolling element. The cage segment 100 is made of a synthetic resin molded by injection molding.

  On the outer periphery of each of the pillar portions 103, an outer guide portion 114 that projects in contact with the outer ring raceway surface of the rolling bearing and guides the rotation of the cage segment 100 is provided. Further, on the inner periphery of each of the column portions 103, a pair of inner guide portions 115 that slide in contact with the inner ring raceway surface of the rolling bearing and guide the rotation of the cage segment 100 are provided apart from each other in the axial direction. The inner guide portion 115 on the second connecting portion 102 side of each inner guide portion 115 also serves as a holding portion that holds the tapered roller from the radially inner side.

European Patent Publication EP 2264325 (A1)

  In the conventional split cage, one adjacent cage segment 100 is pressed in the circumferential direction by the other cage segment 100 due to advance and delay of the tapered rollers, thermal expansion of each cage segment 100, and the like. Sometimes. For this reason, there has been a problem that the cage segments collide with each other or the cage segments themselves deform, causing the cage segment 100 to vibrate in the radial direction or adversely affecting the performance of the rolling bearing.

  The present invention has been made in view of the above problems, and roller bearings that can prevent the cage segments from being damaged due to relative movement of adjacent cage segments in the circumferential direction. The purpose is to provide.

  To achieve the above object, the present invention provides an outer ring, an inner ring, a plurality of rollers arranged between the outer ring and the inner ring, and a plurality of pockets for accommodating the plurality of rollers formed in a circumferential direction. The cage is a roller bearing comprising a plurality of cage segments divided in the circumferential direction, and is recessed in the circumferential direction on one side in the circumferential direction of the plurality of cage segments. The first concave groove is formed continuously, an elastic member is inserted into the first concave groove, and a gap is formed in the circumferential direction between the cage segments facing each other by the elastic member.

  According to the divided cage for a rolling bearing having such a configuration, when the adjacent cage segments try to move relative to each other in the circumferential direction, one adjacent cage segment and the other cage segment Since the cage segments are not in direct contact with each other by the elastic member inserted in the concave groove, the cage segments can be prevented from colliding with each other and the cage segments themselves can be prevented from being deformed to prevent the cage segments from being damaged. .

  The elastic member has a cylindrical shape extending in the axial direction of the cage and is made of rubber. Therefore, since the elastic member can prevent contact with the full axial width of the cage segment, damage to the cage segment can be prevented. In addition, since the elastic member has a cylindrical shape and the concave groove has a circular cross section, the elastic force of the elastic member can be gradually increased according to the deformation of the elastic member.

  Further, the cage is characterized in that a projection-like catching portion that protrudes toward the elastic member and is hooked on the elastic member is formed in the opening of the first concave groove of the cage segment. For this reason, the elastic member is unlikely to fall off from the first concave groove of the cage segment, so that it is possible to prevent the cage segment from being damaged due to coming off. Moreover, the assembling property can be improved.

  In addition, the retainer is recessed in the circumferential direction on the other circumferential side of the plurality of retainer segments to form a second recessed groove continuous in the axial direction, and the first recessed groove and the second recessed groove The gist is that an elastic member is interposed therebetween, and a gap is formed in the circumferential direction between the cage segments by the elastic member. Therefore, since the elastic member of the first concave groove is engaged with the second concave groove, the cage segment can be prevented from abruptly moving even in the radial direction, so that the end face portion of the cage can be more effectively prevented from being damaged. . Moreover, the assembling property can be further improved.

  According to the split cage and the rolling bearing for the rolling bearing according to the present invention, the adjacent cage segments can prevent collision due to relative movement in the circumferential direction, thereby preventing the cage segments from being damaged. it can.

Sectional drawing which shows the principal part which shows the rolling bearing which concerns on one Embodiment of this invention Schematic front view showing a split cage for a rolling bearing according to an embodiment of the present invention The perspective view which shows a part of division | segmentation holder | retainer for rolling bearings concerning one Embodiment of this invention. The principal part perspective view which shows the state which contacted the connection part of the adjacent holder | retainer segment which concerns on one Embodiment of this invention via the elastic member The perspective view which shows a part of division | segmentation holder | retainer for rolling bearings concerning other embodiment. The principal part perspective view which shows the state which connected the connection part of the adjacent cage | basket segment of other embodiment. A perspective view showing an example of a conventional cage segment

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of an essential part showing a tapered roller bearing 10 as a rolling bearing according to an embodiment of the present invention. The tapered roller bearing 10 is a large-sized one that supports the main shaft of the wind turbine generator, and a plurality of tapered rollers 13 as rolling elements are arranged between the outer ring 11 and the inner ring 12, and each tapered roller 13 is replaced with a plurality of tapered rollers 13. It is held by a split cage 1 composed of the cage segments 2.
An outer ring raceway surface 11 a on which each tapered roller 13 rolls is formed on the inner circumference of the outer ring 11, and an inner ring raceway surface 12 a on which each tapered roller 13 rolls is formed on the outer circumference of the inner ring 12. Yes. The end portion of the inner ring 12 is provided with a large flange portion 12b and a small flange portion 12c with which the end surface of the tapered roller 13 contacts with the inner ring raceway surface 12a interposed therebetween.

  FIG. 2 is a schematic front view showing the split cage 1, and FIG. 3 is a perspective view showing a cage segment 2 constituting the split cage 1. The split cage 1 is made of a synthetic resin that is integrally molded by injection molding. Examples of the material of the cage include a polyamide resin, a polyphenylene sulfide resin, or a synthetic resin similar to that of a general synthetic resin cage, such as a resin in which reinforcing fibers are mixed in these resins, polyimide, or polyphthalate. Amide or polyetherketone (PEK) or polyetheretherketone (PEEK) or polyamideimide (PAI) or polyimide (PI) or phenolic resin or other synthetic resin is used.

  The divided cage 1 is configured by arranging a plurality of arc-shaped cage segments 2 in an annular shape along the circumferential direction. The cage segment 2 includes a first connecting portion 21 and a second connecting portion 22 that face each other at a predetermined interval, and a plurality of pillar portions 23 that are laid between the connecting portions 21 and 22. A space surrounded by the two adjacent column portions 23 and the connecting portions 21 and 22 is configured as a pocket 24 that accommodates the tapered rollers 13.

  On the first connecting portion 21 side of the outer periphery of each column portion 23, an outer guide portion 25 that slides in contact with the outer ring raceway surface 11a of the tapered roller bearing 10 and guides the rotation of the cage segment 2 is directed radially outward. Projecting. In addition, an inner guide portion 26 that slides in contact with the inner ring raceway surface 12a of the tapered roller bearing 10 and guides the rotation of the cage segment 2 protrudes radially inward from the inner periphery of each column portion 23. Has been.

  The inner side guide part 26 has two, the 1st connection part 21 side and the 2nd connection part 22 side. The axial width of the inner guide portion 26 on the second connecting portion 22 side is larger than the axial width of the inner guide portion 26 on the first connecting portion 21 side. Further, a claw portion 26a extending in the circumferential direction is formed at the tip end portion (the lower end portion in FIG. 3) of the inner guide portion 26 on the second connecting portion 22 side. The side surface of the claw portion 26a facing the pocket 24 is a curved surface that matches the rolling surface (outer peripheral surface) of the tapered roller 13, and the claw portion 26a holds the tapered roller 13 from the radially inner side. Yes. That is, the inner guide portion 26 on the second connecting portion 22 side also serves as a holding portion that holds the tapered roller 13.

  As shown in FIG. 3, the cage segment of the present invention has a circumferential circumference of the cage at one end 21 a, 22 a of each connecting portion 21, 22 provided over the entire circumferential length of the cage segment 2. There is a first groove 30 that is recessed in the direction by a depth D and that forms a recess that is continuous with the first connecting portion 21 and the second connecting portion 22 in the axial direction.

  Further, the retainer 1 forms protrusions 21b and 22b toward the elastic member 31 at the opening of the first concave groove of the retainer segment, and forms a protrusion-like catching portion that is caught by the elastic member 31. ing. Therefore, the elastic member 31 has a shape that does not easily fall off from the first concave groove 30 of the cage segment.

FIG. 4 is a perspective view showing a part of a state where the connecting portions of adjacent cage segments of the present invention are connected to each other.
A cylindrical elastic member 31 extending in the axial direction of the circular cross section having a diameter d is interposed in the first concave groove 30. The diameter d of the elastic member 31 is larger than the groove depth D of the first concave groove 30 by S, and protrudes from the end surface 21 a of the first connecting portion 21 and the end surface 22 a surface of the second connecting portion 22 by S.

  The elastic member 31 has a cylindrical shape extending in the axial direction of the cage, and is a rubber material. For this reason, the elastic member 31 can prevent contact with the entire axial width of the cage segment, and the elastic member has a cylindrical shape and the concave groove has a circular cross section. The elastic force can be increased gradually. Examples of the material of the elastic member 31 include polyurethane and NBR (acrylonitrile butadiene rubber) CR (chloroprene rubber).

  As described above, the split cage 1 includes the elastic member 31 of one adjacent cage segment 2 (hereinafter also referred to as “first cage segment 2A”) and the other cage segment 2 (hereinafter referred to as “second cage 2”). Are also annularly arranged. In this state, the first cage segment 2 </ b> A and the second cage segment 2 </ b> B, which are arranged in an annular shape, are configured to restrict the mutual contact by holding the clearance S in the circumferential direction.

  Since the split cage 1 having the above configuration engages the elastic member 31 inserted into the first recess of the first cage segment 2A and the end surface of the second cage segment 2B, each cage segment 2 can be secured. Therefore, when the first cage segment 2A is pressed in the circumferential direction by the second cage segment 2B adjacent thereto due to the advance and delay of the tapered roller 13, the thermal expansion of each cage segment 2, and the like. However, in other words, even when the end surfaces 21a and 22a of the adjacent one of the connecting portions 21 and 22 and the end surfaces 21c and 22c of the other connecting portions 21 and 22 are pressed against each other, the end surfaces do not directly contact each other. Therefore, damage can be prevented.

FIG. 5 is a perspective view showing a part of a split cage for a rolling bearing according to another embodiment.
Since the inner and outer rings of the roller bearing are the same as in the embodiment, the description thereof is omitted.

  The split cage 110 is configured by arranging a plurality of arc-shaped cage segments 120 in an annular shape along the circumferential direction. The cage segment 120 includes a first connecting part 121 and a second connecting part 122 that are opposed to each other with a predetermined distance therebetween, and a plurality of column parts 123 that are installed between the connecting parts 121 and 122. A space surrounded by the two adjacent column parts 123 and the connecting parts 121 and 122 is configured as a pocket 124 that accommodates the tapered rollers 113.

  An outer guide portion 125 that slides in contact with the outer ring raceway surface 11a of the tapered roller bearing 10 and guides the rotation of the cage segment 120 is provided radially outwardly on the first connecting portion 121 side of the outer periphery of each column portion 123. Projecting. Further, an inner guide portion 26 that slides in contact with the inner ring raceway surface 12a of the tapered roller bearing 10 and guides the rotation of the cage segment 120 protrudes radially inward from the inner periphery of each column portion 123. Has been.

  There are two inner guide portions 126 on the first connecting portion 121 side and the second connecting portion 122 side. The axial width of the inner guide portion 126 on the second connecting portion 122 side is larger than the axial width of the inner guide portion 126 on the first connecting portion 121 side. Further, a claw portion 126a extending in the circumferential direction is formed at the tip end portion (lower end portion in FIG. 5) of the inner guide portion 126 on the second connecting portion 122 side. The side surface of the claw portion 126a facing the pocket 124 is a curved surface that matches the rolling surface (outer peripheral surface) of the tapered roller 13, and the claw portion 126a holds the tapered roller 13 from the radially inner side. Yes. That is, the inner guide part 126 on the second connecting part 122 side also serves as a holding part that holds the tapered roller 13.

  As shown in FIG. 5, the cage segment 120 of the present invention has a circle of the cage at one end 121 a and 122 a of each connecting portion 121 and 122 provided over the entire circumferential length of the cage segment 2. The first concave groove 130 is recessed in the circumferential direction by a depth E1 and forms a concave portion continuous with the first coupling portion 121 and the second coupling portion 122 in the axial direction.

  Further, the retainer 110 forms protrusions 121b and 122b toward the elastic member 131 at the opening of the first concave groove 130 of the retainer segment 120, and has a protrusion-like catching portion that is caught by the elastic member 131. Forming. Therefore, the elastic member 131 has a shape that does not easily fall off from the first concave groove 130 of the cage segment.

  The cage segment 120 of the present invention further has a depth in the circumferential direction of the cage at the other ends 121c and 122c of the connecting portions 121 and 122 provided over the entire length of the cage segment 120 in the circumferential direction. It has a first concave groove 140 that is recessed by E2 and that forms a concave portion continuous with the first coupling portion 121 and the second coupling portion 122 in the axial direction.

FIG. 6 shows a partial perspective view of a state in which the connecting portions of adjacent cage segments of the present invention are connected to each other.
A cylindrical elastic member 131 extending in the axial direction of the circular cross section having a diameter e is inserted in the first concave groove 130. The diameter e of the elastic member 131 is larger than the groove depth E1 of the first concave groove 130, and is set to be larger than the sum of the groove depths E2 of the second concave groove 140, and the end face of the first connecting portion 21 21a and the end surface 22a surface of the 2nd connection part 22 and the end surface of the retainer segment adjacent to the surface are given the clearance m.

  As shown in FIG. 6, the split cage 120 includes an elastic member 131 of one cage segment 120A (hereinafter also referred to as “first cage segment 120A”) and the other cage segment 120B (hereinafter “first cage segment”). 2 cage segments 120B ”). In this state, the first cage segment 120 </ b> A and the second cage segment 120 </ b> B arranged in an annular shape are configured to restrict the mutual contact with the circumferential clearance m formed.

  The split cage 120 having the above configuration prevents the cage segments 120 from contacting each other because the elastic member 131 is brought into contact between the end surfaces of the first cage segment 120A and the second cage segment 120B. can do. For this reason, even when the first retainer segment 120A is pressed in the circumferential direction by the second retainer segment 120B adjacent to the first retainer segment 120A due to the advance delay of the tapered roller, the thermal expansion of each retainer segment, or the like, That is, even when the end surfaces 121a and 122a of the adjacent one of the connecting portions 121 and 122 and the end surfaces 121c and 122c of the other connecting portions 121 and 122 are pressed against each other, the elastic member 131 is held adjacent in the radial direction. Since the movement of the cage segments 120A and 120B can be prevented, the end surfaces of the cage can be prevented from being damaged more effectively by preventing direct contact between the end surfaces.

  In the embodiment described above, the outer diameter of the outer peripheral surface of the first connecting portion is larger than the outer diameter of the outer peripheral surface of the second connecting portion, and the first connecting portion and the second connecting portion are the large diameter connecting portion and the small diameter connecting portion. Can be expressed. In another embodiment, the cage may be such that the outer diameter of the outer peripheral surface of the first connecting portion plate 1 is substantially the same as the outer diameter of the outer peripheral surface of the second connecting portion 2, and the small diameter connecting portion is a tapered roller bearing. It may be arranged on the small diameter side of the conical raceway surface of the inner ring.

  In the embodiment described above, the elastic member and the gap are applied to the split cage of the tapered roller bearing. As another embodiment, an elastic member and a gap can be applied to a split cage of a cylindrical roller bearing or a split cage of a barrel roller bearing (convex roller bearing).

  1: split cage, 2: cage segment, 21: first connecting portion, 22: second connecting portion, 23: pillar portion, 24: pocket, 25: outer guide portion, 26: inner guide portion, 32: first 1 groove, 31: elastic member

Claims (4)

  An outer ring, an inner ring, a plurality of rollers disposed between the outer ring and the inner ring, and a cage in which a plurality of pockets for accommodating the plurality of rollers are formed in a circumferential direction. In a roller bearing composed of a plurality of cage segments divided into a plurality of circumferential directions, a plurality of cage segments are recessed in the circumferential direction on one side in the circumferential direction, forming a first concave groove continuous in the axial direction, A roller bearing, wherein an elastic member is inserted into the first concave groove, and a gap is formed in a circumferential direction between the cage segments facing each other by the elastic member.   The roller bearing according to claim 1, wherein the elastic member has a cylindrical shape extending in an axial direction of the cage and is made of rubber.   The said retainer protruded to the said elastic member side in the opening part of the said 1st ditch | groove of a retainer segment, and formed the protrusion-shaped catch part hooked on the said elastic member, The Claim 1 or 2 characterized by the above-mentioned. Roller bearings.   The cage is recessed in the circumferential direction on the other circumferential side of the plurality of cage segments to form a second concave groove continuous in the axial direction, and between the first concave groove and the second concave groove. The roller bearing according to any one of claims 1 to 3, wherein an elastic member is interposed, and a gap is formed in the circumferential direction between the cage segments by the elastic member.

Images