JP2010116970A - Cage for thrust bearing and thrust bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cage for a thrust bearing and the thrust bearing, capable of stably holding a rolling element, and capable of increasing load capacity. <P>SOLUTION: An engaging part of becoming large in a distance in the peripheral direction toward the second annular part side in the radial direction, is formed in an end part on the second annular part 22 side in the radial direction of a column part 23. A second annular part 22 is formed with a recessed part 47 having an engaging object part engaging with the engaging part with a shape corresponding to a shape of the engaging part, a first movement limiting part for limiting one side movement in the axial direction of the engaging part, and a second movement limiting part for limiting the other side movement in the axial direction of the engaging part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a thrust bearing retainer and a thrust bearing, and more particularly to a thrust bearing retainer and a thrust bearing that are suitable for use in a rolling mill.

  Conventionally, as a thrust bearing used in a rolling mill, there is a double-row thrust tapered roller bearing (hereinafter simply referred to as a tapered roller bearing) described in JP-A-2006-250155 (Patent Document 1).

  The tapered roller bearing includes an annular shaft washer, an annular first housing washer, an annular second housing washer, a plurality of first tapered rollers, and a plurality of second tapered rollers. The shaft washer rotatably supports a roll neck (not shown) of the rolling mill. The first housing washer is located on one side of the axial washer in the axial direction. The first housing washer faces the axial washer in the axial direction. On the other hand, the second housing washer is located on the other side in the axial direction of the axial washer. The second housing washer is opposed to the axial washer in the axial direction.

  The plurality of first tapered rollers are arranged at intervals in the circumferential direction between the shaft washer and the first housing washer while being held by the annular first retainer. The plurality of second tapered rollers are disposed between the shaft washer and the second housing washer while being held by the annular second retainer at intervals in the circumferential direction. .

  Each of the first cage and the second cage has a first annular body, a second annular body, and a plurality of pins. The first annular body includes a substantially ring-shaped annular portion and a plurality of identical column portions that are integral with the annular portion. Each column portion extends in the radial direction from the outer peripheral surface of the annular portion. The plurality of column portions are arranged at intervals in the circumferential direction of the annular portion.

The outer end surfaces in the radial direction of the respective column portions are in contact with the inner peripheral surface of the second annular body. The number of the pins coincides with the number of the pillar portions. The pin is driven from the outer peripheral surface of the second annular body and extends in the radial direction of the second annular portion. Each said pin penetrates a 2nd annular body to radial direction, and the front-end | tip part of each said pin is difficult to insert in the column part. In this manner, the pillar portion of the first annular body is fastened to the second annular body using the pins.
JP 2006-250155 A (FIG. 3)

  The rolling mill is controlled to accelerate the rotation speed at the start of rolling and to reduce the rotation speed at the end of rolling. In some cases, the tapered roller and the column portion collide with each other during acceleration or deceleration, or the tapered roller and the column portion collide with each other due to the swing of the cage. In particular, since the axial load does not act, when the axial load acts from the state where the tapered roller is rotating while sliding along the raceway surface, the rotation of the tapered roller suddenly recovers and the number of revolutions increases rapidly. In some cases, the collision force between the tapered roller and the column portion increases.

  When the collision between the tapered roller and the column portion is repeated due to the above phenomenon, the pin that fastens the first annular body and the second annular body may loosen, and the strength of the cage decreases. May end up. In addition, if the pin is loosened, the column portion may be in a cantilevered beam state. In this case, it becomes difficult to stably hold the tapered roller with the cage 8, and as a result, the tapered roller It becomes difficult to stably support the roll neck of the rolling mill with a bearing.

  Further, the pillar portion needs to be thickened in the circumferential direction because it is necessary to drive a pin. Therefore, there is a limit in increasing the size of the tapered roller due to the circumferential dimension restriction of the column portion, and there is a problem that it is difficult to increase the load capacity of the tapered roller bearing.

  Accordingly, an object of the present invention is to provide a thrust bearing retainer that can stably hold a rolling element and increase a load capacity, and a thrust bearing having such a thrust bearing retainer.

In order to solve the above problems, the thrust bearing retainer of the present invention is
A first annular portion;
A second annular portion radially facing the first annular portion;
A plurality of pillars extending in a substantially radial direction to connect between the first annular part and the second annular part and spaced apart from each other in the circumferential direction;
The end portion on the second annular portion side of the column portion has an engaging portion that increases in the circumferential distance toward the second annular portion side in the radial direction,
The second annular portion is
A concave portion having a shape corresponding to the shape of the engaging portion and having an engaged portion with which the engaging portion engages;
A first movement restricting portion for restricting movement of one side of the engaging portion in the axial direction;
And a second movement restricting portion that restricts movement of the other side of the engaging portion in the axial direction.

  According to the present invention, the end portion on the second annular portion side of the pillar portion has the engaging portion that increases in the circumferential direction toward the second annular portion side in the radial direction, and The second annular portion has a shape corresponding to the shape of the engaging portion, and has a recessed portion having an engaged portion with which the engaging portion engages, and movement of one side in the axial direction of the engaging portion Since the first movement restriction part for restricting the movement and the second movement restriction part for restricting the movement of the other side in the axial direction of the engagement part are included, the engagement part becomes the second annular part. On the other hand, it hardly moves in the radial direction and the axial direction, and does not come out of the recess. That is, the column portion can be firmly fixed to the second annular portion. Therefore, unlike the case where it engages using the above-mentioned pin, a pillar part does not become a cantilever fixed beam state, but it can hold | maintain a rolling element stably.

  In addition, according to the present invention, since it is a configuration that fixes the column portion to the second annular portion without using a pin, there is no consideration for a decrease in strength due to the driving of the pin. Compared to the conventional configuration, the thickness of the column portion in the circumferential direction can be reduced. Therefore, due to this, the rolling element can be enlarged, so that the load capacity of the thrust bearing can be increased.

In one embodiment,
The first movement restricting portion is formed by plastic deformation of a part of the second annular portion.

  According to the embodiment, since the first movement restriction part is formed by plastic deformation of a part of the second annular part, the first movement restriction part can be formed easily and inexpensively.

In one embodiment,
The column portion includes a main body portion and a protruding portion protruding in a radial direction from a radial end surface of the main body portion, and the engaging portion forms a part of the outer surface of the protruding portion, In the cross section, the end surface of the main body and the engaging portion are connected by a differentiable curve.

  According to the embodiment, in the radial cross section, since the radial end surface of the main body portion and the engagement portion are connected by a differentiable curve, the radial end surface of the main body portion, It can suppress that damage, such as a crack, generate | occur | produces in the connection part with the said engaging part.

The thrust bearing of the present invention is
A first washer having a raceway surface;
A second washer having a raceway surface facing the raceway surface in the axial direction;
A plurality of rolling elements disposed between the raceway surface of the first washer and the raceway surface of the second washer;
The thrust bearing retainer according to the present invention for holding the plurality of rolling elements is provided so that the plurality of rolling elements are spaced apart from each other in the circumferential direction.

  According to the present invention, since the thrust bearing retainer of the present invention is provided, the rolling elements can be stably retained and the load capacity is increased.

  According to the thrust bearing cage of the present invention, the rolling elements can be stably held, and the load capacity of the thrust bearing including the thrust bearing cage can be increased.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view in the axial direction of a double-row thrust tapered roller bearing which is an embodiment of the thrust bearing of the present invention.

  This double-row thrust tapered roller bearing (hereinafter referred to as a tapered roller bearing) is disposed at an axial end of a roll neck of a rolling roll (not shown). Specifically, the rolling roll has a four-row cylindrical roller bearing or a four-row tapered roller bearing disposed between the outer peripheral surface of the roll neck and the inner peripheral surface of the housing (roll chock). It is rotatably supported with respect to the housing. The tapered roller bearing is disposed in the roll neck at the outer side in the axial direction of the four-row cylindrical roller bearing or the four-row tapered roller bearing. The tapered roller bearing is adapted to receive the axial load of the rolling roll.

  The tapered roller bearing includes an annular shaft washer 1 as a first washer, an annular first housing washer 2 as a second washer, an annular second housing washer 3, and a plurality of first tapered rollers. 5. A plurality of second tapered rollers 6, a first annular retainer 7 as a thrust bearing retainer according to an embodiment, and a second annular retainer 8 as a thrust bearing retainer according to an embodiment.

  The shaft washer 1 extends substantially in the radial direction. The end surfaces on one side and the other side of the axial washer 1 in the axial direction have a planar shape. Each of the end surfaces on one side and the other side in the axial direction of the axial washer 1 extends substantially in the radial direction. An end surface on one side in the axial direction of the axial washer 1 constitutes a first raceway surface 12, and an end surface on the other side in the axial direction of the axial washer 1 constitutes a second raceway surface 13.

  The first housing washer 2 has a substantially L-shaped cross section. An end surface of the first housing washer 2 on the axial washer 1 side in the axial direction has a conical surface whose distance from the first raceway surface 12 of the axial washer 1 increases as going outward in the radial direction. . The conical surface of the first housing washer 2 constitutes a raceway surface 15. The first housing washer 2 has a flange. The radially inner end surface of the flange portion is continuous with the radially outer end portion of the raceway surface 15. An inner end surface in the radial direction of the flange portion constitutes a guide surface for guiding the first tapered roller 5.

  The second housing washer 3 has a substantially L-shaped cross section. The second housing washer 3 and the first housing washer 2 are disposed substantially symmetrically with respect to the vertical bisector of the axial washer 1. The end face of the second housing washer 3 on the axial washer 1 side in the axial direction has a conical surface whose distance from the second raceway surface 13 of the axial washer 1 increases as going outward in the radial direction. . The conical surface of the second housing washer 3 constitutes a raceway surface 16. The second housing washer 3 has a flange. The radially inner end surface of the flange portion is continuous with the radially outer end portion of the raceway surface 16. An inner end surface in the radial direction of the flange portion constitutes a guide surface for guiding the second tapered roller 6.

  The plurality of first tapered rollers 5 are circumferentially held by the first annular cage 7 between the first raceway surface 12 of the shaft washer 1 and the raceway surface 15 of the first housing washer 2. It is arranged at intervals in the direction. The plurality of second tapered rollers 6 are held by the second annular cage 8 between the second raceway surface 13 of the shaft washer 1 and the raceway surface 16 of the second housing washer 3. Are arranged at intervals in the circumferential direction.

  FIG. 2 is a plan view of a part of the first annular cage 7 when viewed from the direction indicated by the arrow A in FIG. 1 and is a plan view when viewed from the outside in the axial direction. The second annular cage 8 has the same structure as the first annular cage 7. The description of the second annular cage 8 is omitted from the description of the first annular cage 7.

  The first annular cage 7 is made of a known material such as steel, plastic, or copper alloy. As shown in FIG. 2, the first annular cage 7 has a first annular part 21, a second annular part 22, and a plurality of pillar parts 23. The outer diameter of the outer peripheral surface of the first annular portion 21 is smaller than the inner diameter of the inner peripheral surface of the second annular portion 22.

  Each of the column portions 23 extends radially outward from the outer peripheral surface of the first annular portion 21. The plurality of column portions 23 are arranged at intervals in the circumferential direction. All the circumferential distances between the adjacent column portions 23 are substantially equal.

  The first annular portion 21 and the plurality of column portions 23 are integrated. Each of the column parts 23 includes a main body part 30 and a protruding part 31. The main body 30 has a substantially rectangular shape in the plan view of FIG. The side surface in the circumferential direction of the main body 30 plays a role of guiding the rolling surface of the first tapered roller 5 (see FIG. 1). A side surface in the circumferential direction of the main body 30 forms a part of a pocket.

  On the other hand, the protruding portion 31 constitutes an end portion on the second annular portion 22 side in the radial direction of the column portion 23. The protruding portion 31 protrudes in the radial direction from the end surface of the main body portion 30 on the second annular portion 22 side in the radial direction. The protrusion 31 has a substantially isosceles trapezoidal shape in the plan view of FIG.

  The protrusion 31 has a first end surface 40 and a second end surface 41 at one end and the other end in the circumferential direction (specifically, the circumferential direction of the second annular portion 22). A planar portion exists at the radial center of each of the first end surface 40 and the second end surface 41. The distance in the circumferential direction between the two planar portions positioned at an interval in the circumferential direction increases toward the second annular portion 22 side in the radial direction. The two planar portions constitute an engaging portion of the column portion 23.

  As shown in FIG. 2, the second annular portion 22 has a plurality of recesses 47 whose radial cross-sectional shape substantially matches the radial cross-sectional shape of the protruding portion 31. The number of the concave portions 47 matches the number of the column portions 23. The plurality of recesses 47 are positioned on the inner peripheral side of the second annular portion 22 at intervals in the circumferential direction. A planar portion exists at the radial center of the two end faces in the circumferential direction of the recess 47. The two planar portions have a shape corresponding to the engagement portion of the column portion 23 and are engaged with the engagement portion of the column portion 23. The two planar portions of the recess constitute an engaged portion.

  FIG. 3 is a cross-sectional view taken along line BB of FIG. 2, and shows a cut when the first annular cage 7 is cut by a plane perpendicular to the circumferential direction and the plane 23 is divided into two equal parts. Surface.

  As shown in FIG. 3, the protruding portion 31 of the column portion 23 has a rectangular cross section. The protruding portion 31 of the column portion 23 protrudes from the central portion in the axial direction of the main body portion 30 of the column portion 23 toward the second annular portion 22 in the radial direction. An end surface 70 of the protruding column 31 opposite to the main body 30 side of the column portion 23 is in contact with a radial side surface 71 of the concave portion 47 of the second annular portion 22.

  The second annular portion 22 has a substantially L shape in the cross section of FIG. The second annular portion 22 includes a main body portion 60 having a substantially rectangular cross section, a first movement restriction portion 61, and a second movement restriction portion 62.

  The first movement restricting portion 61 protrudes from the one end portion in the axial direction of the main body portion 60 toward the first annular portion 21 (see FIG. 2) in the radial direction. The first movement restricting portion 61 is formed by caulking one end portion in the axial direction of the second annular portion 22 and plastically deforming a part of the one end portion toward the first annular portion 21 in the radial direction. Yes. On the other hand, the second movement restriction portion 62 has a substantially rectangular cross section. The second movement restriction portion 62 protrudes from the other end portion in the axial direction of the main body portion 60 toward the first annular portion 21 (see FIG. 2) in the radial direction. The second movement restricting portion 62 covers the entire other end side of the concave portion 47 in the axial direction, and the inner peripheral surface is the inner peripheral surface of the portion of the second annular portion 22 without the concave portion 47 in the same axial direction. It has a continuous surface with the same diameter.

  As shown in FIG. 3, the protruding portion 31 is located between the first movement restriction portion 61 and the second movement restriction portion 62 in the axial direction. The first movement restricting portion 61 is in contact with the surface on one side of the protruding portion 31 in the axial direction and restricts movement of the protruding portion 31 on one side in the axial direction, while the second movement restricting portion 62 is The movement of the protruding portion 31 on the other side in the axial direction is restricted by contacting the surface of the protruding portion 31 on the other side in the axial direction. The concave portion 47 is opened only on the first movement restricting portion 61 side in the axial direction.

  In this first annular cage 7, after inserting the protruding portion 31 of the pillar portion 23 in the axial direction from the opening side in the axial direction into the concave portion 47 of the second annular portion 22 before caulking one end portion in the axial direction, One end of the second annular portion 22 on the opening side is caulked to form the first movement restricting portion 61 by plastic deformation so that the protruding portion 31 does not come out of the second annular portion 22. In this way, the first annular cage 7 is manufactured by assembling the pillar portion 23 integral with the first annular portion 21 (see FIG. 2) to the second annular portion 22.

  FIG. 4 is a diagram illustrating a detailed cross-sectional view in the radial direction of the column portion 23 and a cross-sectional view in the radial direction around the concave portion 47 of the second annular portion 22.

  As shown in FIG. 4, in the radial cross-sectional view, the radial end surface 80 of the main body portion 30 of the column portion 23 and the engagement portion 81 of the column portion 23 are connected by a differentiable curve. The engaging portion 81 of the portion 23 and the radial end surface 82 of the protruding portion 31 are connected by a differentiable curve. In the radial cross-sectional view, the engaged portion 90 of the concave portion 47 of the second annular portion 22 and the radial end surface 91 of the concave portion 47 are connected by a differentiable curve. The joining portion 90 and the inner peripheral surface 92 of the second annular portion 22 are connected by a differentiable curve. On both sides in the circumferential direction, the end surface 80 of the column portion 23 and the inner peripheral surface 92 of the second annular portion 22 come into contact with each other, and the engaging portion 81 of the column portion 23 and the recess 47 of the second annular portion 22 The engaged portion 90 comes into contact with the engaged portion 90.

  According to the first and second annular cages 7 and 8 of the above embodiment, the end of the column part 23 on the second annular part 22 side is on the second annular part 22 side in the circumferential direction. The engagement portion 81 has a shape corresponding to the shape of the engagement portion 81 and the engagement portion 81 is engaged. A concave portion 47, a first movement restricting portion 61 that restricts movement of one side of the engaging portion 81 in the axial direction, and a second movement restricting portion that restricts movement of the engaging portion 81 on the other side in the axial direction. 62, the engaging portion 81 hardly moves in the radial direction and the axial direction with respect to the second annular portion 22, and the column portion 23 does not come out of the concave portion 47. That is, the column part 23 can be firmly fixed to the second annular part 22. Therefore, unlike the case where it engages using the above-mentioned pin, the pillar part 23 does not become a cantilever fixed beam state, but the 1st tapered roller 5 can be hold | maintained stably.

  Further, according to the first and second annular cages 7 and 8 of the above embodiment, since the structure is such that the pillar portion 23 is fixed to the second annular portion 22 without using a pin, the strength resulting from the driving of the pin. Therefore, the thickness of the column portion 23 in the circumferential direction can be reduced. Therefore, due to this, the first and second tapered rollers 5 and 6 can be enlarged, so that the load capacity of the thrust bearing can be increased.

  Further, according to the first and second annular cages 7 and 8 of the above embodiment, the first movement restricting portion 61 is formed by plastically deforming a part of the second annular portion 22. The one movement restricting portion 61 can be formed easily and inexpensively.

  Further, according to the first and second annular cages 7 and 8 of the above-described embodiment, the radial end surface 80 of the main body portion 30 of the column portion 23 and the engaging portion 81 are differentiated in the radial cross section. Since they are connected by a possible curve, it is possible to suppress the occurrence of damage such as cracks at the connecting portion between the radial end surface 80 of the main body 30 and the engaging portion 81.

  Although the first and second annular cages 7 and 8 in the above embodiment are the cages that hold the tapered rollers 5 and 6, the cage according to the present invention is other than a tapered roller such as a cylindrical roller or a ball. It may be a cage that holds the rolling elements.

  In the first and second annular cages 7 and 8 of the above embodiment, the first annular portion 21 and the column portion 23 having a smaller diameter than the second annular portion 22 are integrated, and the column portion 23 and the second annular retainer are integrated. In the present invention, the first annular portion and the column portion having a diameter larger than that of the second annular portion are integrated, and the column portion and the second annular portion are integrated. You may engage using an engaging part. In the present invention, the radial end of the column portion and the first annular portion are engaged with each other using the engaging portion, and the radial other end portion of the column portion and the second annular portion are You may engage using an engaging part.

  Further, in the first and second annular cages 7 and 8 of the above embodiment, the engaging portion 81 of the column portion 23 and the engaged portion 90 of the second annular portion 22 are flat, but this invention Then, the engaging part of the column part and the engaged part of the second annular part may be formed of curved surfaces. In short, the engaging portion only needs to increase in distance in the circumferential direction toward the second annular portion in the radial direction, and the engaged portion may have a shape corresponding to the engaging portion. .

  In the thrust bearing of the above embodiment, the first and second housing washer 2 and 3 are arranged on both sides in the axial direction of the axial washer 1, and the axial washer 1 and the first housing washer 2 are interposed between them. While the first tapered roller 5 is disposed and the second tapered roller 6 is disposed between the shaft washer 1 and the second housing washer 3, the thrust bearing of the present invention has a rolling element that is single in the axial direction. It may be arranged in a row.

  Moreover, in the said embodiment, the thrust bearing provided with the 1st and 2nd cyclic | annular retainer 7 and 8 was arrange | positioned at the roll neck of the rolling roll. However, the thrust bearing including the thrust bearing retainer according to the present invention may be disposed at any location of any machine as long as it is in an environment where an axial load is received.

It is a schematic cross section of the axial direction of the double row thrust tapered roller bearing which is one Embodiment of the thrust bearing of this invention. It is a top view when a part of 1st annular holder is seen from the direction shown by arrow A in FIG. It is BB sectional drawing of FIG. It is a figure which shows detailed sectional drawing of the radial direction of a pillar part, and radial sectional drawing of the periphery of the recessed part of a 2nd annular part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Axis washer 2 First housing washer 3 Second housing washer 5 First tapered roller 6 Second tapered roller 7 First annular cage 8 Second annular cage 12 First raceway surface of axial washer 13 Axis raceway Second raceway surface of board 15 Raceway surface of first housing washer 16 Raceway surface of second housing washer 21 First annular portion 22 Second annular portion 23 Column portion 30 Column portion main body 31 Column portion protrusion 47 Recessed portion of second annular portion 61 First movement restricting portion 62 Second movement restricting portion 80 Radial end surface of main portion of pillar portion 81 Engaging portion of pillar portion 90 Engaged portion of recessed portion

Claims (4)

A first annular portion;
A second annular portion radially facing the first annular portion;
A plurality of pillars extending in a substantially radial direction to connect between the first annular part and the second annular part and spaced apart from each other in the circumferential direction;
The end portion on the second annular portion side of the column portion has an engaging portion that increases in the circumferential distance toward the second annular portion side in the radial direction,
The second annular portion is
A concave portion having a shape corresponding to the shape of the engaging portion and having an engaged portion with which the engaging portion engages;
A first movement restricting portion for restricting movement of one side of the engaging portion in the axial direction;
A thrust bearing retainer, comprising: a second movement restricting portion that restricts movement of the engaging portion on the other side in the axial direction. The thrust bearing retainer according to claim 1,
The thrust bearing retainer, wherein the first movement restricting portion is formed by plastic deformation of a part of the second annular portion. The thrust bearing retainer according to claim 1 or 2,
The column is
The main body,
A projecting portion projecting in a radial direction from a radial end face of the main body portion,
The engaging portion forms a part of the outer surface of the protruding portion,
A thrust bearing retainer characterized in that, in a radial cross section, the end surface of the main body and the engaging portion are connected by a differentiable curve. A first washer having a raceway surface;
A second washer having a raceway surface facing the raceway surface in the axial direction;
A plurality of rolling elements disposed between the raceway surface of the first washer and the raceway surface of the second washer;
The thrust bearing retainer according to any one of claims 1 to 3, wherein the plurality of rolling elements are held so that the plurality of rolling elements are spaced apart from each other in the circumferential direction. A featured thrust bearing.

Images