JP2014020389A - Assembly method for roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an assembly method for a roller bearing capable of securing the integration of cage segments, rollers and an outer ring to allow easy assembly.SOLUTION: The assembly method for a tapered roller bearing 1 includes a step of annularly arranging cage segments 6 embracing tapered rollers 4 on the inner periphery of an outer ring 2, a step of inserting shims 11 into gaps S to fill up the gaps S in the state that, to produce gaps S between one ends out of the ends of all adjacent cage segments 6, the other ends abut each other, a step of temporarily fixing a restricting tool 12 to the outer ring 2 to restrict the movement of the cage segments 6 relative to the outer ring 2 in the axial direction, and a step of fitting an inner ring 3 into the outer ring 2 so that an inner raceway surface 3a has internal contact with the tapered rollers 4.

Description

  The present invention relates to a method for assembling a roller bearing including a split cage in which a plurality of cage segments are arranged in an annular shape.

  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. 10 is a main part perspective view showing an example of a conventional cage segment, and FIG. 11 is a main part sectional view showing a tapered roller bearing using a conventional cage segment. The cage segment 100 includes a pair of first and second rim portions 101 and 102 opposed to each other at a predetermined interval, and a plurality of column portions 103 installed between the first and second rim portions 101 and 102. A space surrounded by the adjacent column part 103 and the first and second rim parts 101, 102 is configured as a pocket 104 for accommodating a tapered roller 113 (see FIG. 11) as a rolling element. Yes. The cage segment 100 is made of a synthetic resin 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 a divided cage 120 including a plurality of the cage segments 100. On the outer periphery of the inner ring 112, a raceway surface 112a on which each tapered roller 113 rolls and a large collar portion 112b on which the end surface of the tapered roller 113 contacts are formed.
In the tapered roller bearing 110, for example, the cage segments 100 are annularly arranged along the inner circumference of the outer ring 111, and the tapered rollers 113 are sequentially inserted into the pockets 104 of the cage segments 100, and then each tapered roller. It is assembled by fitting the inner ring 112 so as to be inscribed in 113.

European Patent Publication EP 2264325 (A1)

The conventional tapered roller bearing 110 is arranged on the inner peripheral surface of the outer ring 111 in a state where the cage segments 100 are separated from each other in a state before the inner ring 112 is fitted into the outer ring 111. It is easy to drop off from the outer ring 111 together with the tapered roller 104. For this reason, there has been a problem that many man-hours are required to assemble the tapered roller bearing 110.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a roller bearing assembling method that can ensure the integrity of the cage segment, the roller, and the outer ring and can be easily assembled. And

  An assembly method for a roller bearing according to the present invention includes an outer ring, an inner ring, a plurality of rollers that are rotatably arranged between an outer raceway surface formed on the outer ring and an inner raceway surface formed on the inner ring. Each of the first and second rims that are held in the circumferential direction and are divided into a plurality of portions in the circumferential direction. And a plurality of pillars erected between the first and second rim parts, and the rollers are accommodated in a space surrounded by the neighboring pillar parts and the first and second rim parts. A method of assembling a roller bearing in which a plurality of cage segments made of synthetic resin, which are configured as pockets, are annularly arranged along a circumferential direction, and the rollers are held on the inner periphery of the outer ring A step of annularly arranging the cage segments and all adjacent cage segments; Inserting a shim that fills the gap into the gap in a state in which the other ends are abutted so that a gap is created between the ends of the first and second ends, and each of the cages A step of temporarily fixing a restriction jig for restricting the movement of the segment in the axial direction relative to the outer ring to the outer ring; and a step of fitting the inner ring so that the inner raceway surface is inscribed in the rollers. , Including.

  According to the present invention, after the cage segments holding the rollers are annularly arranged on the inner periphery of the outer ring, a gap is formed between the ends of one of the adjacent cage segment ends. By inserting a shim into the gap in a state where the other ends are brought into contact with each other so that a gap occurs, the gap between the ends of all adjacent cage segments can be eliminated. As a result, the ends of the adjacent cage segments stick to each other in the circumferential direction, whereby the cage segments are held in an annularly arranged state. Furthermore, in this state, a restraining jig is fixed to the outer ring and each cage segment is prevented from moving in the axial direction with respect to the outer ring, thereby preventing the cage segment from falling off the outer ring together with the rollers. Can do. Thereby, since the integrity of the cage segment, the roller and the outer ring can be secured, the roller bearing can be easily assembled.

The assembly method of the roller bearing includes: a projection provided at an end of one cage segment; and an end of the other cage segment. It is preferable that the recess provided in the is fitted and abutted.
In this case, when the ends of the adjacent cage segments are butted together, the convex portions and the concave portions are fitted and abutted so that each cage segment is stably held in an annularly arranged state. . Thereby, a roller bearing can be assembled still more easily.

  According to the assembly method of the roller bearing of the present invention, the integrity of the cage segment, the roller and the outer ring can be ensured, so that the roller bearing can be easily assembled.

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 division holder of the said tapered roller bearing. The holder | retainer segment of the said division | segmentation holder | retainer is shown, (a) is a top view, (b) is AA arrow sectional drawing of (a). It is sectional drawing which shows the jig | tool used at the time of the assembly of the said tapered roller bearing. It is a side view which shows the holder | retainer segment 6 in the middle of the assembly of the said tapered roller bearing. It is principal part sectional drawing which shows the assembly method of the said tapered roller bearing. It is sectional drawing of the retainer segment which shows the assembly method of the said tapered roller bearing. It is principal part sectional drawing which shows the assembly method of the said tapered roller bearing. It is a side view which shows the retainer segment of the tapered roller bearing which concerns on other embodiment of this invention. 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 cage | basket 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 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 turbine generator, and includes an outer ring 2, an inner ring 3, and a plurality of tapered rollers 4 arranged between the outer ring 2 and the inner ring 3. And a split cage 5 for holding each tapered roller 4 inside and holding each tapered roller 4 divided into a plurality 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 is formed a large flange portion 3b that protrudes radially outward from the inner raceway surface 3a and contacts the large end surface 4a of the tapered roller 4.

  FIG. 2 is a schematic side view showing the split cage 5. The divided cage 5 is configured by arranging a plurality of cage segments 6 formed in an arc shape in an annular shape along the circumferential direction. The length dimension of each cage segment 6 in the circumferential direction is set so that a minute gap is generated between the end portions of adjacent cage segments 6 in the annularly arranged state.

  3A and 3B show the cage segments 6 constituting the split cage 5, wherein FIG. 3A is a plan view and FIG. 3B is a cross-sectional view taken along the line AA in FIG. The cage segment 6 includes a first rim portion 21 and a second rim portion 22 which are opposed to each other with a predetermined spacing in the axial direction, and a plurality of column portions laid between the first and second rim portions 21 and 22. 23, and a space surrounded by the two adjacent column portions 23 and the first and second rim portions 21 and 22 is configured as a pocket 24 that accommodates the tapered roller 4. The cage segment 6 is made of synthetic resin integrally molded by injection molding.

  As shown in FIG. 3B, the end faces 6a and 6b on both sides in the circumferential direction of the cage segment 6 are both flat. Further, a circular arc surface 23 a along the outer peripheral surface of the tapered roller 4 is formed on the side surface on the pocket 24 side of each column portion 23 so that the tapered roller 4 does not come out radially inward. Thereby, the cage segment 6 is configured to hold the tapered rollers 4 accommodated in the pockets 24 in a state of being held inside.

  FIG. 4 is a cross-sectional view showing the jig 10 used when the tapered roller bearing 1 is assembled. FIG. 5 is a side view showing the cage segment 6 during the assembly of the tapered roller bearing 1. The jig 10 includes a shim 11 made of a flat plate member inserted between the end portions of a predetermined cage segment 6, and a restriction jig 12 temporarily fixed to the end surface 2 b on one side in the axial direction of the outer ring 2. I have.

  As shown in FIG. 5, the thickness of the shim 11 is such that when the other ends excluding one end among the ends of all adjacent cage segments 6 are abutted with each other, It is set to the same length as the circumferential length of the gap S generated between the portions. Therefore, by inserting the shim 11 into the gap S and filling the gap S, gaps between the ends of all adjacent cage segments 6 can be eliminated. The thickness of the shim 11 in this embodiment is set to 2 to 3 mm.

  As shown in FIG. 4, the restriction jig 12 is made of a plate member having a substantially L-shaped cross section, and has a main body portion 12a and a restriction portion 12b that is bent with respect to the main body portion 12a. doing. A through hole 12a1 that penetrates in the thickness direction is formed in the main body portion 12a. A bolt 13 is inserted into the through hole 12a1 and is screwed into a female screw portion 2c formed in the outer ring 2. As a result, the main body 12 a is temporarily fixed to the end surface 2 b of the outer ring 2.

  The restricting portion 12b extends in the axial direction along the outer raceway surface 2a of the outer ring 2 in a state where the main body portion 12a is temporarily fixed to the end surface 2b, and the large end surface 4a of the tapered roller 4 is formed on the restricting portion 12b. It comes to contact. Thereby, when the large end surface 4a of the tapered roller 4 abuts on the restriction jig 12, it is possible to restrict the tapered roller 4 from moving to one side in the axial direction (the right side in FIG. 4) with respect to the outer ring 2. . Further, since the outer raceway surface 2a of the outer ring 2 is a tapered surface that gradually decreases in diameter from one side in the axial direction toward the other side in the axial direction, the tapered roller 4 is made to the outer ring 2 by the outer raceway surface 2a. The movement to the other side in the axial direction can be restricted.

  Next, a method for assembling the tapered roller bearing 1 will be described with reference to FIGS. First, as shown in FIG. 6, the cage segments 6 that enclose the tapered rollers 4 are arranged annularly along the inner periphery of the outer ring 2 (see also FIG. 2). Next, as shown in FIG. 7, the other end portions are butted together so that a gap S is formed between one end portions of the end portions of all adjacent cage segments 6. That is, among the adjacent cage segments 6 that are the other end portions, the end surface 6 a of one cage segment 6 and the end surface 6 b of the other cage segment 6 are brought into surface contact.

Next, as shown in FIG. 5, a shim 11 is inserted into the gap S to eliminate gaps between the ends of all adjacent cage segments 6. As a result, the ends of the adjacent cage segments 6 stick to each other in the circumferential direction, so that each cage segment is held in an annularly arranged state.
Next, as shown in FIG. 4, the main body portion 12 a is temporarily fixed to the end surface 2 b of the outer ring 2 in a state where the restricting portion 12 b of the restricting jig 12 is along the outer raceway surface 2 a of the outer ring 2. Specifically, the bolt 13 passes through the through hole 12a1 of the main body portion 12a and is screwed into the female screw portion 2c of the outer ring 2. Thereby, the movement of the cage segment 6 and the tapered roller 4 in the axial direction with respect to the outer ring 2 is restricted, and the cage segment 6, the tapered roller 4 and the outer ring 2 are integrated.

  Next, as shown in FIG. 8, the inner ring 3 is fitted from one axial side of the outer ring 2 (right side in the figure) so that the inner raceway surface 3 a of the inner ring 3 is inscribed in each tapered roller 4. After the inner ring 3 is fitted in this manner, the shim 11 is removed from the gap S, and the screw 13 is released from the bolt 13 and the female thread portion 2c of the outer ring 2 to remove the regulating jig 12 from the outer ring 2. Thereby, the assembly of the tapered roller bearing 1 is completed.

  According to the method for assembling the tapered roller bearing 1 having the above-described configuration, after the cage segments 6 having the tapered rollers 4 embedded therein are annularly arranged on the inner periphery of the outer ring 2, the ends of all adjacent cage segments 6 are arranged. By inserting shims 11 into the gap S in a state where the other ends are abutted so that a gap S is generated between one end of the parts, all adjacent cage segments 6 It is possible to eliminate a gap between the ends of the two. As a result, the ends of the adjacent cage segments 6 stick to each other in the circumferential direction, whereby the cage segments 6 are held in an annularly arranged state. Further, in this state, the restriction jig 12 is fixed to the outer ring 2 to restrict the movement of the cage segments 6 in the axial direction with respect to the outer ring 2. Can be prevented from falling off. Thereby, since the integrity of the cage segment 6, the tapered roller 4 and the outer ring 2 can be ensured, the tapered roller bearing 1 can be easily assembled.

  FIG. 9 is a side view showing a cage segment of a tapered roller bearing according to another embodiment of the present invention. The tapered roller bearing of this embodiment is different from the above-described embodiment in that the shape of the end surfaces 6a and 6b of the cage segment 6 and the shape of the shim 11 are different. In the cage segment 6 of the present embodiment, an end surface 6a that is an end portion on one side in the circumferential direction is a substantially V-shaped concave portion that is recessed in the circumferential direction, and an end surface 6b that is an end portion on the other side in the circumferential direction is It is made into the substantially V-shaped convex part which protrudes in the circumferential direction. The convex portion 6b at the end of one cage segment 6 and the concave portion 6a at the end of the other cage segment 6 are fitted in surface contact with each other.

  The shim 11 according to the present embodiment fills a substantially V-shaped gap S generated between the convex portion 6 b of one cage segment 6 and the concave portion 6 a of the other cage segment 6 between adjacent holding segments 6. Therefore, it is formed in a substantially V-shaped cross section. Thereby, the convex part 6b and recessed part 6a of other edge parts are made to fit so that the clearance gap S may arise between the edge parts of the edge parts of all the adjacent cage | basket segments 6. FIG. When the shim 11 is inserted into the gap S in the state of being butted against each other, the gaps between the ends of all the adjacent cage segments 6 can be eliminated. As a result, the ends of the adjacent cage segments 6 stick to each other in the circumferential direction, whereby the cage segments 6 are held in an annularly arranged state. Other configurations of the present embodiment are the same as those of the above-described embodiment, and thus description thereof is omitted.

  According to the above assembly method of the tapered roller bearing 1 of the present embodiment, when the end portions of the adjacent holding segments 6 are abutted with each other, the convex portions 6b and the concave portions 6a are fitted and abutted. The vessel segments 6 are stably held in an annular arrangement. Thereby, the tapered roller bearing 1 can be assembled more easily.

  The present invention is not limited to the above embodiment and can be implemented with appropriate modifications. For example, the shim 11 in the above embodiment is composed of a single plate member having a predetermined thickness, but may be configured by a plate member divided into a plurality of portions in the thickness direction. Further, although the restricting jig 12 is in contact with the tapered roller 4, it may be in contact with the retainer segment 6 to restrict movement of the retainer segment 6 in the axial direction. Furthermore, the present invention can be applied to cylindrical roller bearings in addition to tapered roller bearings.

  1: Tapered roller bearing (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, 6a: end face (concave part), 6b: end face (convex part), 11: shim, 12: restricting jig, 21: first rim part, 22: second rim part, 23: pillar part, 24: pocket, S: Gap

Claims (2)

An outer ring, an inner ring, a plurality of rollers arranged to roll between an outer raceway surface formed on the outer ring and an inner raceway surface formed on the inner ring, and each roller is held inside. And a split cage that is split into a plurality in the circumferential direction,
The split cage includes first and second rim portions that are spaced apart from each other by a predetermined distance in the axial direction, and a plurality of column portions that are laid between the first and second rim portions. A plurality of synthetic resin-made cage segments are arranged in a ring shape along the circumferential direction, and the space surrounded by the first and second rim portions is configured as a pocket for accommodating the rollers. A roller bearing assembly method comprising:
A step of annularly arranging the cage segments enclosing the rollers on the inner periphery of the outer ring;
A shim that fills the gap is inserted in the gap with the other ends abutted so that a gap is created between the ends of all the adjacent cage segments. Process,
A step of temporarily fixing a restriction jig for restricting movement of each cage segment in the axial direction relative to the outer ring to the outer ring;
And a step of fitting the inner ring so that the inner raceway surface is inscribed in the rollers.   The ends of adjacent holding segments, which are the other ends, are fitted with a convex portion provided at the end of one cage segment and a concave portion provided at the end of the other cage segment. The roller bearing assembling method according to claim 1, wherein the roller bearings are brought into contact with each other.

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