JP6142535B2 - Split cage and roller bearing provided with split cage - Google Patents

Description

  The present invention relates to a split cage formed by annularly arranging a plurality of cage segments and a roller bearing provided with the split 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 composed of a plurality of cage segments arranged in an annular shape.

FIG. 6 is a perspective view showing an example of a conventional cage segment, and FIG. 7 is a cross-sectional view of a main part showing a tapered roller bearing using the conventional cage segment.
The cage segment 100 includes a pair of first and second rim portions 101 and 102 opposed to each other with a predetermined spacing in the axial direction, and a plurality of columns erected between the first and second rim portions 101 and 102. Part 103.
A space surrounded by the adjacent column portion 103 and the first and second rim portions 101 and 102 is a pocket 104 that accommodates a tapered roller 113 (see FIG. 7) as a rolling element. The cage segment 100 is made of synthetic resin and is molded by injection molding.

  In the tapered roller bearing 110, a plurality of tapered rollers 113 are arranged between the outer ring 111 and the inner ring 112, and each tapered roller 113 is held by the divided cage 120 including the plurality of cage segments 100. A raceway surface 112a on which each tapered roller 113 rolls is formed on the outer periphery of the inner ring 112, and a large collar portion 112b and a small collar portion 112c with which the end surface of the tapered roller 113 comes into contact with the raceway surface 112a. Is provided.

  In the tapered roller bearing 110, for example, the tapered rollers 113 are sequentially inserted into the pockets 104 of the cage segments 100, the cage segments 100 are annularly arranged along the outer periphery of the inner ring 112, and then the inner rings 112 are held. It is assembled together with the container segment 100 and the tapered roller 113 by fitting into the outer ring 111 previously mounted on the housing.

European Patent Publication EP 2264325 (A1)

  The conventional tapered roller bearing 110 is arranged on the outer periphery of the inner ring 112 in a state where the cage segments 100 can be separated from each other before the inner ring 112 is fitted into the outer ring 111. For this reason, the cage segment 100 easily falls off from the inner ring 112 together with the tapered rollers 104. As a result, it is difficult to fit the inner ring 112 into the outer ring 111 attached to the housing together with the cage segments 100 and the tapered rollers 113, and there is a problem that it takes a lot of man-hours to assemble the tapered roller bearing 110. .

  The present invention has been made in view of the above problems, and provides a split cage that can ensure the integrity of each cage segment, roller, and inner ring, and can easily assemble a roller bearing. With the goal.

The split cage of the present invention that achieves the above-mentioned object is formed between a first rim part and a second rim part that are formed in a circular arc shape and face each other with a predetermined distance in the axial direction. A plurality of retainer segments, each of which comprises a plurality of pillar portions installed in the space, and a space surrounded by the adjacent pillar portions and the first and second rim portions is configured as a pocket for accommodating rollers. A split cage that is arranged in a ring shape along the direction, a concave portion made of a leaf spring provided at one end of the circumferentially opposite ends of adjacent cage segments, and the other A convex portion that is held in a state of being engaged with the concave portion by the elastic force of the concave portion, and the convex portion is the one end portion and the other end portion. Having contact surfaces that can contact each other in a state of being engaged with the recess, The end and the other end have a gap larger than the gap between the tip of the leaf spring and the end face of the one end facing the tip between the contact surfaces. It is formed .

  The split cage of the present invention is provided with a concave portion made of a leaf spring provided at one end portion of the opposite ends of adjacent cage segments and an elastic portion of the concave portion provided at the other end portion. And a convex portion that is held in a state of being engaged with the concave portion by force. For this reason, it is possible to prevent the cage segments from separating by engaging the convex portions with the concave portions formed of leaf springs to connect the cage segments. Therefore, since the integrity of each cage segment, roller and inner ring can be ensured, the roller bearing can be assembled easily and efficiently.

In the split cage of the present invention, the one end and the other end portion, in a state where the convex portion is engaged with the recess, that have a contact surface capable of contacting each other. Therefore , even if an external force acts on the cage segment in a direction in which the ends of adjacent cage segments are brought closer to each other, the contact surfaces are brought into contact with each other, so that the leaf spring can be prevented from being damaged.

In the split cage of the present invention, the one end and the other end have the contact surface, and the end surface of the leaf spring and the end surface of the one end facing the tip. greater gap than the gap between the found that are formed to occur between the adjacent said abutment surface.

Therefore , even if an external force acts on the cage segment in a direction to bring the ends of adjacent cage segments closer to each other, before the abutment surfaces of both ends abut against each other, the tip of the leaf spring is the end surface of one end. Abut. Thereby, since the reaction force by the elastic force of a leaf | plate spring arises with respect to the said external force, the impact by contact | abutting of contact surfaces can be eased.

  The present invention also includes an inner ring having an outer raceway surface formed on the outer periphery, an outer ring having an inner raceway surface formed on the inner periphery, and a rollable arrangement between the outer raceway surface and the inner raceway surface. A roller bearing comprising a roller and any one of the above divided cages.

  According to the split cage of the present invention, the integrity of each cage segment, roller and inner ring can be ensured, so that the roller bearing can be assembled easily and efficiently.

It is principal part sectional drawing which shows the tapered roller bearing which concerns on one Embodiment of this invention. It is a schematic side view which shows the split cage of a tapered roller bearing. It is a schematic plan view which shows an adjacent retainer segment. FIG. 4 is an enlarged sectional view taken along line BB in FIG. 3. It is explanatory drawing which shows before and after the connection of the adjacent holder | retainer segment. It is a perspective view which shows an example of the conventional holder | retainer segment. It is principal part sectional drawing which shows the tapered roller bearing using the conventional split cage.

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 1 provided with a split cage 5 according to an embodiment of the present invention.
The tapered roller bearing 1 of the present embodiment is a large-sized one that supports the main shaft of the wind power generator and the like, and includes a plurality of tapered rollers 4 arranged between the outer ring 2, the inner ring 3, and the outer ring 2 and the inner ring 3. And holding the respective tapered rollers 4 while holding them, and a split cage 5 divided into a plurality of portions in the circumferential direction.

  An outer raceway surface 2a made of a conical surface is formed on the inner periphery of the outer ring 2 so that the tapered rollers 4 roll. An inner raceway surface 3a made of a conical surface is formed on the outer periphery of the inner ring 3 so that the tapered rollers 4 roll at positions facing the outer raceway surface 2a. Further, on the outer periphery of the inner ring 3, there are a large collar part 3 b and a small collar part 3 c that protrude radially outward across the inner raceway surface 3 a and contact the end faces 4 a and 4 b on both sides in the axial direction of the tapered roller 4. Is formed.

FIG. 2 is a schematic side view showing the split cage 5. FIG. 3 is a schematic plan view showing two adjacent cage segments 6 among a plurality of cage segments 6 constituting the divided cage 5.
As shown in FIG. 2, the split cage 5 is configured by arranging a plurality (four in the illustrated example) of cage segments 6 in a circular shape along the circumferential direction C. . As shown in FIG. 3, the cage segment 6 includes a first rim portion 21 and a second rim portion 22 which are opposed to each other in the axial direction A with a predetermined distance therebetween, and the first rim portion 21 and the second rim portion 22. A plurality of column portions 23a to 23e are provided between them.

  A space surrounded by the two adjacent column portions 23 a to 23 e and the first and second rim portions 21 and 22 is a pocket 24 that accommodates the tapered roller 4. The cage segment 6 is made of synthetic resin such as 46 nylon, 66 nylon, PPS (polyferene sulfide), and PEEK (polyether ether ketone), and is integrally formed by injection molding.

  The pillar portions 23a to 23e are arranged from the one end side 6a in the circumferential direction C of the cage segment 6 toward the other end side 6b, the first pillar portion 23a, the second pillar portion 23b, the third pillar portion 23c, and the fourth pillar portion. 23d and 5th pillar part 23e are arrange | positioned at equal intervals in this order, and are comprised. The first pillar portion 23a and the fifth pillar portion 23e are disposed at one end and the other end of the cage segment 6 in the circumferential direction C, respectively.

  A concave portion 15 including a pair of metal leaf springs 15a and 15b is provided on one end portion 10 of the end portions 10 and 11 facing each other in the circumferential direction C of adjacent cage segments 6. The end surface 10a of the one end portion 10 facing the other end portion 11 is formed flat, and the recess 15 protrudes from the end surface 10a toward the other end portion 11 in the center in the axial direction A of the end surface 10a. Is provided. The recess 15 is provided so that the pair of leaf springs 15 a and 15 b constituting the recess 15 face each other in the axial direction A.

Further, the other end portion 11 is provided with a convex portion 16 that is held in a state of being engaged with the concave portion 15 by the elastic force of the concave portion 15 (plate springs 15a and 15b). The end face of the other end 11 that faces the one end face 10 is located between the side end face 11a formed on both sides in the axial direction A and the side end face 11a in the circumferential direction C from the side end face 11a. And a central end face 11b formed at the retracted position. The convex part 16 is formed in the aspect which protrudes toward the one edge part 10 from the axial direction A center of the center end surface 11b.
The end surface 10a of one end 10 and the side end surface 11a of the other end 11 become contact surfaces 10a and 11a that can contact each other in a state where the protrusion 16 is engaged with the recess 15.

4 is an enlarged sectional view taken along line BB in FIG.
As shown in FIG. 4, arc surfaces 23 b 1 and 23 c 1 along the outer peripheral surface of the tapered roller 4 are provided on the side surfaces of the column portions 23 a to 23 e on the pocket 24 side so that the tapered roller 4 does not come out radially outward. Is formed. Thereby, the holder | retainer segment 6 is hold | maintained in the state which held the tapered roller 4 accommodated in the pocket 24 of each pillar part 23a-23e outside.

  FIG. 5 is an explanatory view showing before and after connection of adjacent cage segments 6. Specifically, FIG. 5 (a) is an enlarged plan view showing the end portions 10 and 11 facing each other in the circumferential direction C of adjacent cage segments 6 before connection, and FIG. 5 (b) is a view after connection. FIG. 3 is an enlarged plan view showing end portions 10 and 11.

  Hereinafter, the structure of the convex part 16 and the recessed part 15 is further explained in full detail. As shown in FIG. 5, the convex portion 16 has a base end portion 16a having a constant width in the axial direction A extending from the central end surface 11b toward the one end portion 10, and a front end side of the base end portion 16a. The distal end portion 16b bulges so that the maximum width in the axial direction A is wider than the base end portion 16a. The tip portion 16b is formed in a circular shape in plan view. The convex portion 16 is formed with a protruding height whose tip substantially coincides with the position in the circumferential direction C of the side end surface 11a.

The concave portion 15 includes a first accommodating portion 15a1 and a second accommodating portion 15b1 that accommodate the distal end portion 16b of the convex portion 16, and the distal end portion 16a and the first accommodating portion 15a1 when the convex portion 16 is engaged with the concave portion 15. 2 It is comprised by the 1st, 2nd introducing | transducing part 15a3 and 15b3 guided between the accommodating parts 15b1.
The first and second accommodating portions 15a1 and 15b1 are formed in a shape along both side surfaces of the tip portion 16a of the convex portion 16. Moreover, the 1st accommodating part 15a1 and the 2nd accommodating part 15b1 are separated by the space | interval which can accommodate the front-end | tip part 16a.

  The first and second introduction portions 15a3 and 15b3 gradually expand outward in the axial direction A from the first and second accommodation portions 15a1 and 15b1 toward the other end portion 11, respectively, and the first tip 15a4 of the recess 15 and The distance between the second tips 15 b 4 is formed to be wider than the maximum width of the convex portion 16.

  Between the 1st accommodating part 15a1 and the 1st introducing | transducing part 15a3, and between the 2nd accommodating part 15b1 and the 2nd introducing | transducing part 15b3, it becomes the 1st, 2nd narrow part 15a2, 15b2, respectively. The concave portion 15 is formed such that the interval between the first narrow portion 15 a 2 and the second narrow portion 15 b 2 is narrower than the maximum width of the convex portion 16.

  In adjacent cage segments 6, the convex part 16 is inserted into the concave part 15 along the circumferential direction C from the first and second introduction parts 15 a 3 and 15 b 3, and the tip part 16 b of the convex part 16 is the first and first of the concave part 15. The two narrow portions 15a2 and 15b2 are overcome by resisting the elastic force of the leaf springs 15a and 15b, and are connected by being accommodated between the accommodating portions 15a1 and 15b1. In the connected state of the adjacent cage segments 6, the boundary portion between the base end portion 16 a and the tip end portion 16 b of the convex portion 16 is engaged and held by the first and second narrow portions 15 a 2 and 15 b 2 of the concave portion 15.

  In a state where the convex portion 16 is engaged with the concave portion 15 (the state shown in FIG. 5B), the first and second tips 15a4 and 15b4 of the concave portion 15 (plate springs 15a and 15b) A gap W larger than the gap V between the end face 10a and the end face 10a is formed between the contact faces 10a and 11a. One end 10 and the other end 11 are formed such that the gap W is larger than the gap V.

  The split cage 5 according to the above embodiment includes a concave portion 15 including leaf springs 15a and 15b provided at one end portion 10 between the end portions 10 and 11 facing each other in the circumferential direction C of adjacent cage segments 6. It has. The split cage 5 includes a convex portion 16 that is provided at the other end portion 11 and is held while being engaged with the concave portion 15 by the elastic force of the concave portion 15.

  For this reason, it is possible to prevent the cage segments 6 from being separated by engaging the convex portions 16 with the concave portions 15 including the leaf springs 15a and 15b to connect the cage segments 6 to each other. Therefore, since the integrity of each cage segment 6, the tapered roller 4 and the inner ring 3 can be ensured, the tapered roller bearing 1 can be assembled easily and efficiently.

  The one end 10 and the other end 11 of the cage segment 6 have contact surfaces 10 a and 11 a that can contact each other in a state where the convex portion 16 is engaged with the concave portion 15. For this reason, even if an external force acts on the cage segment 6 in a direction in which the end portions 10 and 11 of adjacent cage segments 6 are brought closer to each other, the abutment surfaces 10a and 11a come into contact with each other, so that the leaf springs 15a and 15b Can be prevented from being damaged.

  Further, one end 10 and the other end 11 of the cage segment 6 have the contact surfaces 10a and 11a. Further, the one end 10 and the other end 11 are a gap between the first and second tips 15a4 and 15b4 of the leaf springs 15a and 15b and the central end face 11b of the one end 10 facing the tip. A gap W larger than V is formed between the contact surfaces 10a and 11a.

  For this reason, even if an external force acts on the cage segment 6 in a direction in which the end portions 10 and 11 of adjacent cage segments 6 are brought closer to each other, before the abutment surfaces 10a and 11a of the both end portions 10 and 11 come into contact with each other. The first and second tips 15a4 and 15b4 of the leaf springs 15a and 15b are in contact with the central end face 11b. As a result, a reaction force due to the elastic force of the leaf springs 15a and 15b is generated against the external force, so that the impact caused by the contact between the contact surfaces 10a and 11a can be reduced.

  In addition, the concave portion 15 is configured to guide the distal end portion 16a between the first accommodating portion 15a1 and the second accommodating portion 15b1 when the convex portion 16 is engaged with the concave portion 15 from the circumferential direction. , 15b3. For this reason, since the convex part 16 can be easily inserted into the concave part 15 from the circumferential direction C, the adjacent cage segments 6 can be easily connected.

  The present invention is not limited to the embodiment described above, and can be implemented with appropriate modifications. For example, in the above-described embodiment, the roller bearing is the tapered roller bearing 1, but it may be a cylindrical roller bearing. Moreover, in the above-mentioned embodiment, the end surface 10a of the one end part 10 in which the recessed part 15 is provided is flat, and the end surface of the other end part 11 in which the convex part 16 is formed is the side end surface 11a and the circumferential direction. Although the center end surface 11b and the like receding to the inside of C are configured, the end surface of one end portion 10 and the end surface of the other end portion 11 may be opposite to the above. In the above-described embodiment, the convex portion 16 and the concave portion 15 are provided in the center of the cage segment 6 in the axial direction A, and the contact surfaces 10a and 11a are provided on both sides in the axial direction A. 16 and the recess 15 may be provided in pairs on both sides in the axial direction A, and the contact surface may be provided at the center position in the axial direction A.

  1: Tapered roller bearing, 2: outer ring, 2a: outer raceway surface, 3: inner ring, 3a: inner raceway surface, 4: tapered roller (roller), 5: split cage, 6: cage segment, 10: one End part, 11: The other end part, 10a, 11a: Contact surface, 11b: Central end face (end face of one end part), 15: Recessed part, 15a, 15b: Leaf spring, 15a4, 15b4: First, first 2 tip (tip of leaf spring), 16: convex part, 21: first rim part, 22: second rim part, 23a, 23b, 23c, 23d, 23e: pillar part, 24: pocket, A: axial direction, C: circumferential direction, V: gap, W: gap

Claims (2)

A first rim part and a second rim part which are formed in an arc shape and are opposed to each other with a predetermined distance in the axial direction; and a plurality of pillar parts laid between the first and second rim parts; Divided cage formed by annularly arranging a plurality of cage segments forming a space surrounded by the matching column portion and the first and second rim portions as pockets for accommodating rollers. Because
A concave portion made of a leaf spring provided at one end portion of the end portions of the adjacent cage segments facing each other in the circumferential direction, and a concave portion provided at the other end portion. A convex portion that is held in a combined state ,
The one end portion and the other end portion have contact surfaces that can contact each other in a state where the convex portion is engaged with the concave portion,
The gap between the one end and the other end is larger than the gap between the tip of the leaf spring and the end face of the one end facing the tip. A split cage characterized by being formed to occur . An inner ring having an outer raceway surface formed on an outer periphery, an outer ring having an inner raceway surface formed on an inner periphery, and a roller rotatably disposed between the outer raceway surface and the inner raceway surface; A roller bearing comprising the split cage according to claim 1 .

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