JP2013145024A - Cage for cylindrical roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cage for a cylindrical roller bearing, which improves lubricity by reducing the difference in lubrication conditions of a cage and a cylindrical roller, independent of a rotational direction of a bearing in a machined cage for a cylindrical roller bearing and having a claw for preventing dropout.SOLUTION: A cage 5 includes: a pair of annular bodies 51 facing to each other in the direction of a central line; a plurality of posts 52 for connecting both annular bodies 51; pockets 53 formed of both annular bodies 51 and the posts 52 and disposed at a plurality of positions in a circumference direction; a cylindrical roller 4 retained in the pocket 53 in a manner to be freely rollable; and a claw 54 for preventing the dropout of the cylindrical roller 4 caused by coming into the inside in the radial direction from sliding faces 52a, 52b on which the post 52 slides at both ends in the peripheral direction in contact with the cylindrical roller 4. In the cage, a space S is formed between the cylindrical roller 4 and the claw 54. In the post 52, a through hole 55 penetrating between both end faces 52a, 52b in the peripheral direction is formed.

Description

  The present invention relates to a cylindrical roller bearing retainer.

  A large cylindrical roller bearing that supports a rotation support portion of a wind power generation facility or the like has a plurality of cylindrical rollers arranged in an annular bearing inner space between an inner ring and an outer ring, and rolls these cylindrical rollers at predetermined intervals. And a cage in which a pocket for holding is formed. As this cage, since it is large and requires strength, a machined type cage produced by machining is often used. This machined type retainer is provided with a drop-off preventing structure for preventing the cylindrical roller from dropping out from the pocket inward or outward in the radial direction when the bearing is assembled. For example, this drop-off prevention structure is formed by bending so that the claw that protrudes radially inward from both circumferential end surfaces of the column body formed between adjacent pockets and toward the circumferential surface of the cylindrical roller wraps around the cylindrical roller. Is formed. Thereby, the cylindrical roller regulates the dropout from the pocket inward in the radial direction to prevent the dropout. (Patent Document 1)

Japanese Utility Model Publication No. 5-12753

  In the above-described cylindrical roller bearing, the lubricating oil inside the bearing scatters in the bearing internal space as the rotating wheel rotates and the cage rotates. In a portion where the gap between the cylindrical roller and the claw is open in the direction of rotation of the cage, the lubricating oil scattered by the claw is scraped into the gap and fed between the cage and the cylindrical roller. On the other hand, at locations where the gap between the cylindrical roller and the claw is open in the direction opposite to the rotation direction of the cage, the lubricating oil scattered by the claw cannot be scraped into this gap, so the cage and the cylinder It is not sent in between. Therefore, there is a difference in the lubrication state between the cage and the cylindrical roller depending on the rotation direction of the bearing. Therefore, a machined cylindrical roller bearing retainer having a drop-off preventing claw can improve the lubricity by reducing the difference in the lubrication state between the retainer and the cylindrical roller regardless of the rotation direction of the bearing. It was an issue.

  The present invention has been made to solve such a problem, and in a cage-type cylindrical roller bearing retainer having a drop-off preventing claw, the cage and the cylindrical roller, regardless of the rotation direction of the bearing. It is an object of the present invention to provide a cylindrical roller bearing retainer capable of improving the lubricity by reducing the difference in the lubrication state between the two.

In order to solve the above-mentioned problem, a structural feature of the cylindrical roller bearing retainer according to claim 1 is that a pair of annular bodies opposed to each other in the center line direction and a plurality of column bodies connecting the both annular bodies are provided. A pocket formed by the two annular bodies and the pillars and provided at a plurality of locations in the circumferential direction; cylindrical rollers that are rotatably held in the pockets; and the pillars on both sides of the cylindrical rollers in the circumferential direction. In a cylindrical roller bearing retainer comprising: a claw that restricts the cylindrical roller from falling off from both sliding contact surfaces that are in sliding contact with each other, projecting to either the radially inner side or the outer side,
A gap is formed between the cylindrical roller and the claw, and a through-hole penetrating between the sliding contact surfaces is formed in the column body.

  According to the cylindrical roller bearing retainer of the first aspect, in the portion where the gap between the cylindrical roller and the claw is open in the rotation direction of the retainer, the bearing internal space is scattered by rotation of the retainer or the like. Lubricating oil is scraped into the gap by the claws and fed between the cage and the cylindrical roller. Since the lubricating oil is guided to the adjacent pocket through the through hole, the difference in the lubrication state between the cage and the cylindrical roller can be reduced regardless of the rotation direction of the bearing, and the lubricity can be improved.

  A structural feature of the cylindrical roller bearing retainer according to claim 2 is that a plurality of the through holes are formed in the column body, and the through holes are formed from the root of the claw to the column body. The sliding contact surface on the side is the sliding contact surface on the opposite side in the circumferential direction, and is formed toward the vicinity of the position where the sliding contact surface and the cylindrical roller are in sliding contact.

  According to the cage for cylindrical roller bearings of claim 2, the gap between the claw of one pocket among the pockets formed on both sides in the circumferential direction with respect to the column body and the cylindrical roller is opened in the rotation direction of the cage. In the place where it is, the lubricating oil scattered in the bearing internal space due to the rotation of the cage or the like is scraped into the gap by the claw and sent between the cage and the cylindrical roller. Also, the lubricating oil scraped by the claw is guided from the base of the claw having a large amount of oil to the vicinity of the sliding contact position where the cylindrical roller of the other pocket requires the lubricating oil through the through hole. Also, the lubricity is good. On the other hand, when the rotation direction of the bearing is reversed, the lubricating oil scraped by the claw on the other pocket side is fed into the other pocket. Further, since the lubricating oil is guided to the vicinity of the position where the cylindrical roller in one pocket is slidably contacted through the through hole, the lubricity is good also in the one pocket. Thereby, the lubricity can be improved by reducing the difference in the lubrication state between the cage and the cylindrical roller regardless of the rotation direction of the bearing.

  The structural feature of the cylindrical roller bearing retainer according to claim 3 is that the opening end located on the base side of the claw among both opening ends of the through hole is expanded in diameter than the diameter of the through hole. It is that.

  According to the cylindrical roller bearing retainer of the third aspect, the lubricating oil scraped by the claws is easily introduced into the through hole while suppressing a decrease in strength due to an increase in the cavity of the retainer. Thereby, the lubricity can be improved by reducing the difference in the lubrication state between the cage and the cylindrical roller regardless of the rotation direction of the bearing.

  The cylindrical roller bearing retainer according to claim 4 is characterized in that the axial position of the through hole is substantially the same as the axial position of the claw.

  According to the cylindrical roller bearing cage of the fourth aspect, the lubricating oil scraped by the claws reaches the through hole at a short distance, and is efficiently guided to the adjacent pocket through the through hole. Thereby, the lubricity can be improved by reducing the difference in the lubrication state between the cage and the cylindrical roller regardless of the rotation direction of the bearing.

  According to the present invention, in a machined cylindrical roller bearing retainer having a drop-off preventing claw, lubrication is improved by reducing the difference in the lubrication state between the retainer and the cylindrical roller regardless of the rotation direction of the bearing. A cage for a cylindrical roller bearing that can be improved can be provided.

It is an axial sectional view of a cylindrical roller bearing provided with a cylindrical roller bearing retainer that is an embodiment of the present invention. It is a perspective view of the holder | retainer in the said cylindrical roller bearing. It is AA sectional drawing of FIG. It is a principal part enlarged view of FIG. It is BB sectional drawing of FIG.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment in which a cylindrical roller bearing retainer of the present invention is embodied will be described with reference to the drawings.
FIG. 1 is an axial sectional view of a cylindrical roller bearing 1 including a cylindrical roller bearing retainer 5 that is a large-sized bearing that supports a rotation support portion of a wind power generation facility or the like according to an embodiment of the present invention. This will be described with reference to FIG.

  The cylindrical roller bearing 1 includes an outer ring 2 having a raceway surface 21 on an inner peripheral surface, an inner ring 3 having a raceway surface 31 on an outer peripheral surface and serving as a rotating ring, and raceway surfaces 21 of the outer ring 2 and the inner ring 3. A plurality of cylindrical rollers 4 disposed in the circumferential direction between 31 and a cage that is guided in sliding contact with the inner peripheral surface of the outer ring 2 and holds the cylindrical rollers 4 at a predetermined interval in the circumferential direction so that they can roll. 5 (cylindrical roller bearing retainer).

  FIG. 2 is a perspective view of the cage 5 in the cylindrical roller bearing 1. 3 is a cross-sectional view taken along the line AA in FIG. This will be described with reference to FIGS. The cage 5 is formed by a pair of annular bodies 51 opposed to each other in the axial direction of the cylindrical roller bearing 1, a plurality of column bodies 52 connecting the both annular bodies 51, the both annular bodies 51 and the column bodies 52. A plurality of pockets 53 are provided in the circumferential direction so as to hold the cylindrical rollers 4 in a rollable manner, and the cylindrical rollers 4 projecting radially inward from both sides in the circumferential direction of the columnar body 52 and placed in the pockets 53 are provided in the radial direction. And a claw 54 for restricting falling off to the inside.

  The claw 54 protrudes from both end faces (sliding contact surfaces) in the circumferential direction of the column body 52 radially inward and toward the circumferential surface of the cylindrical roller, and is bent so as to wrap around the cylindrical roller 4. A gap S is formed between the two. The claws 54 are formed in two rows in the axial direction.

  The column body 52 is formed with a through hole 55 that penetrates between both end faces in the circumferential direction and communicates between adjacent pockets 53. In one column body 52, two through holes 55 having different inclination directions with respect to the circumferential direction are formed in one row of the claws 54 in the axial direction, and the claws 54 are formed in two rows. A number of through holes 55 are formed. Further, the diameter of the through hole 55 is the same throughout the entire length.

4 is an enlarged view of a main part of FIG. This will be described with reference to FIG. About the structure of the through-hole 55 (it is also called the through-hole 55a) shown as a continuous line, it divides into the opening position (opening end) of the circumferential direction one end surface 52a side of the column body 52, and the opening position of the circumferential direction other end surface 52b side. explain.
An opening position P1 (also referred to as an opening position P1a) on the end surface 52a side of the through hole 55a is formed at a root 54a1 of a claw 54 (also referred to as a claw 54a) on the end surface 52a side.
On the other hand, the opening position P2 (also referred to as opening position P2b) on the end surface 52b side is formed at a position 52b1 where the column body 52 on the end surface 52b side and the cylindrical roller 4 (also referred to as cylindrical roller 4b) are in sliding contact with each other in the circumferential direction. .

Further, the configuration of the through hole 55 (also referred to as the through hole 55b) indicated by a broken line will be described separately for the opening position on the end surface 52b side and the opening position on the end surface 52a side.
The opening position P1 (also referred to as opening position P1b) on the end surface 52b side of the through hole 55b is formed at the root 54b1 of the claw 54 (also referred to as claw 54b) on the end surface 52b side.
On the other hand, the opening position P2 (also referred to as opening position P2a) on the end surface 52a side is formed at a position 52a1 where the column 52 on the end surface 52a side and the cylindrical roller 4 (also referred to as cylindrical roller 4a) are in sliding contact with each other in the circumferential direction. .

  Next, the movement of the lubricating oil when the inner ring 3 rotates in the direction of arrow C will be described. When the inner ring 3 rotates in the direction of arrow C, the cylindrical roller 4 moves in the direction of arrow E while rotating in the direction of arrow D, and the cage 5 is pressed against the cylindrical roller 4 and rotates in the direction of arrow E. With the rotation of the inner ring 3 and the rotation of the cage 5, the lubricating oil scatters in the bearing inner space 6 that is an annular space between the outer ring 2 and the inner ring 3. The lubricating oil is scraped into a gap S (also referred to as a gap Sa) formed between the claw 54a and the cylindrical roller 4a as indicated by an arrow F by the claw 54a, so that the cage 5 and the cylindrical roller 4a Sent in between. The lubricating oil lubricates the sliding contact portion between the cage 5 and the cylindrical roller 4a and reaches the opening position P2b from the opening position P1a through the through hole 55a as shown by an arrow F, The sliding contact part with the cylindrical roller 4b is lubricated.

  On the other hand, when the inner ring 3 rotates in the direction opposite to the direction of the arrow C, the lubricating oil scattered in the bearing internal space 6 becomes a gap S (gap Sb) formed between the claw 54b and the cylindrical roller 4b by the claw 54b. (Also referred to as “also called”) and fed between the cage 5 and the cylindrical roller 4b. This lubricating oil lubricates the sliding contact portion between the cage 5 and the cylindrical roller 4b, and reaches the opening position P2a from the opening position P1b through the through hole 55b, and the sliding between the cage 5 and the cylindrical roller 4a. Lubricate the contact.

  Thereby, the difference in the lubrication state between the retainer 5 and the cylindrical roller 4 can be reduced regardless of the rotation direction of the bearing.

FIG. 5 is a cross-sectional view taken along the line BB of FIG. This will be described with reference to FIG. The through hole 55 in the axial direction is formed with through holes 55 a and 55 b having different inclination directions with respect to the circumferential direction corresponding to one claw 54, with the axial position being substantially the same as the claw 54.
As a result, the lubricating oil scraped by the claw 54 reaches the through hole 55 at a short distance. In this manner, the lubricating oil is efficiently guided to the pocket 53 adjacent to the through hole 55 shown in FIG. For this reason, the difference in the lubrication state between the cage 5 and the cylindrical roller 4 can be reduced regardless of the rotation direction of the bearing.

  As described above, according to the cage 5 according to the present embodiment, in the machined cylindrical roller bearing cage having the drop-off preventing claw, the cage 5 and the cylindrical roller 4 It is possible to provide a cylindrical roller bearing retainer that can improve the lubricity by reducing the difference in the lubrication state between the two.

  In the above embodiment, the plurality of through holes 55 are formed in the column body 5. However, the present invention is not limited to this. For example, when the rotation direction of the rotating wheel is one direction, In addition, the through hole may be inclined and applied to a configuration in which the through hole is formed at one place of the column.

  Moreover, in the said embodiment, although the diameter of the through-hole 55 was made the same formation over the full length, it is not restricted to it, For example, the nail | claw 54 of both opening position P1, P2 of the through-hole 55 is used. You may apply to the structure by which the diameter by the side of the opening position P1 located in the base side is expanded rather than the diameter of the through-hole 55. FIG. In this case, the lubricating oil scraped by the claws can be easily introduced into the through hole while suppressing a decrease in strength due to an increase in the cavity of the cage. For this reason, the lubricity between the cage and the cylindrical roller can be improved.

  In the above embodiment, the claw 54 is provided in two rows in the axial direction. However, the present invention is not limited thereto. For example, when the length of the cylindrical roller in the axial direction is long, the claw has three rows or more. There may be. Further, when the axial length of the cylindrical roller is short, the claw may be a single row.

  Moreover, in the said embodiment, although the cylindrical roller bearing 1 was set as the structure which consists of a single row cylindrical roller 4, it is not restricted to it, For example, you may apply to the structure which consists of a double row cylindrical roller.

  Moreover, in the said embodiment, although the cylindrical roller bearing 1 was set as the structure which does not mount | wear with a sealing device, it is not restricted to it, For example, you may apply to the structure which mounts a sealing device.

  In the above embodiment, the cage 5 is guided by the outer ring 2. However, the present invention is not limited to this. For example, the cage may be applied to the configuration guided by the inner ring. When the cage is guided by the inner ring, the drop-off preventing claw is configured to protrude radially outward from the column.

1: cylindrical roller bearing, 2: outer ring, 3: inner ring, 4, 4a, 4b: cylindrical roller, 5: cage (cylindrical roller bearing cage), 6: bearing internal space, 21: raceway surface, 31: raceway Surface, 51: annular body, 52: pillar body, 52a, 52b: end face (sliding contact surface), 52a1, 52b1: position, 53: pocket, 54, 54a, 54b: claw, 55, 55a, 55b: through hole, 54a1, 54b1: root, P1, P1a, P1b, P2, P2a, P2b: opening position (opening end), S, Sa, Sb: gap

Claims (4)

A pair of annular bodies opposed to each other in the center line direction, a plurality of pillars connecting the annular bodies, pockets formed by the annular bodies and the pillars, and provided at a plurality of locations in the circumferential direction; and the pockets A cylindrical roller that is held so as to be able to roll, and a cylindrical body that protrudes either radially inward or outward from both sliding contact surfaces in which the column body is in sliding contact with the cylindrical roller on both sides in the circumferential direction. A retainer for a cylindrical roller bearing comprising a claw for restricting the roller from falling off,
A retainer for a cylindrical roller bearing, wherein a gap is formed between the cylindrical roller and the claw, and a through hole is formed in the column body so as to penetrate between both sliding contact surfaces.   A plurality of the through holes are formed in the column body, and the through hole is a sliding contact surface on a side opposite to the sliding contact surface on the base side in the circumferential direction from the base of the claw. The cylindrical roller bearing retainer according to claim 1, wherein the retainer is formed near a position where the sliding contact surface and the cylindrical roller are in sliding contact.   3. The cylindrical roller bearing holding according to claim 2, wherein an opening end located on the base side of the claw among both opening ends of the through hole is larger in diameter than the diameter of the through hole. vessel.   The cylindrical roller bearing retainer according to any one of claims 1 to 3, wherein an axial position of the through hole is substantially the same as an axial position of the claw.

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