JP2019065946A - Cage and self-aligning roller bearing - Google Patents

Abstract

To easily manufacture a cage for a self-aligning roller bearing having a model number by which it has been difficult to form pockets by press punching.SOLUTION: A cage 14 has a first annular body 31, a second annular body 32 and a plurality of columns 33, and clearances between the adjacent columns 33 in a peripheral direction serve as pockets 34 for accommodating rollers being rolling bodies. Pocket faces 36 constituting the pockets 34 being side faces of the first annular body 31 are plane faces. When the rollers are arranged in the pockets 34, the pocket faces 36 become nonparallel with roller end faces. In each pocket 34 included in a plurality of pockets 34, a virtual plane K3 including a one-side pocket face 36 in an axial direction of the cage, and extending to a cage center-axis C2 side passes the other side in the axial direction of the cage rather than a circular arc part 47 at an opposite side which separates from the pocket 34 of the second annular body 32 by 180°.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a cage and a self-aligning roller bearing.

  Rolling bearings are used in various devices, and a self-aligning roller bearing 90 as shown in FIG. 6 is known as an example (see, for example, Patent Document 1). The self-aligning roller bearing 90 includes an inner ring 91, an outer ring 92, two rows of rollers (rolling elements) 93, cages 94 and 94 for holding the rollers 93 in each row, and a guide wheel 95. Is done as follows. First, the guide ring 95 and the pair of retainers 94 are assembled on the outer peripheral side of the inner ring 91, and these are inserted on the inner peripheral side of the outer ring 92 in such a manner that their central axes are orthogonal to each other. Next, the rollers 93 are accommodated in each pocket 96 of the retainer 94. Finally, the inner ring 91 side including the cage 94 holding the rollers 93 and the outer ring 92 are rotated so that their central axes coincide with each other.

  In order to assemble the self-aligning roller bearing 90 as described above, the cage 94 is an annular member whose outer diameter is smaller than the inner diameter of the outer ring 92. Each cage 94 includes a first annular body 97 on one side in the axial direction of the cage of the roller 93, a second annular body 98 on the opposite side, and the first annular body 97 and the second annular body 98. And a plurality of connecting columns 99. Between the first annular body 97 and the second annular body 98 and between the circumferentially adjacent pillars 99 is a pocket 96 that accommodates the roller 93. The roller 93 held in the pocket 96 contacts the inner ring 91 (and the outer ring 92) at a predetermined contact angle α0.

  As the self-aligning roller bearing 90 becomes large or super large, naturally, the cage 94 also becomes large (diameter becomes large). In the case of the large-sized cage 94, it is generally made of metal, and the formation of the pocket 96 is performed by graining (cutting) or punching with a press. The punching process by the press requires less man-hours than the machined process, and the productivity is good.

JP, 2017-009009, A

  However, as described below, depending on the holder 94, it may be difficult to form the pocket 96 by punching.

  FIG. 7 is a cross-sectional view of a conventional cage 94. Each of the pocket surfaces 96a, 96a on both sides in the axial direction of the cage of the pocket 96 is parallel to the roller end surface 93a because the end surface of the roller 93 to be held (hereinafter referred to as "roller end surface 93a") contacts. It is formed. As described above (see FIG. 6), since the roller 93 contacts the inner ring 91 with the contact angle α0, the roller end surface 93a also has an inclination angle β0 with respect to the radial direction on one side in the axial direction of the cage. 7), and this inclination angle β0 is equal to the contact angle α0. For this reason, the pocket surface 96a is formed in a plane (plane with an inclination angle β0) that is inclined with respect to the radial direction so as to be parallel to the roller end surface 93a so as to match the inclination angle β0 of the roller end surface 93a.

  In the case of a large or ultra-large bearing, the contact angle α0 tends to be small, and correspondingly, the inclination angle β0 with respect to the radial direction of the pocket face 96a on one axial side of the cage also becomes small. Then, in order to punch out the pocket 96 having such a pocket surface 96 a by a press, as shown in FIG. 8, the punch 100 operated by the press is a portion opposite to the pocket forming portion 89 of the holder 94. To avoid interference at 101, it is necessary to use an L-shaped punch 100. FIG. 8 is an explanatory view showing punching of the pocket 96 by the punch 100. As shown in FIG.

In the case of the L-shaped punch 100, it is cantilevered from the side of the press body 102. For this reason, in the case shown in FIG. 8, when the pocket 96 is punched downward, the arm portion of the punch 100 bends upward due to the moment load generated by the reaction force, and the processing becomes difficult. In particular, when the cage 94 is large, the plate thickness t0 is increased (for example, 5 mm or more) to secure rigidity. Then, although it is necessary to increase the force required for punching by a press, since the punch 100 is supported in a cantilever manner, the processing becomes more difficult.
As described above, it is difficult to form the pocket 96 by punching, particularly in the case of a large or ultra-large cage 94.

  Therefore, an object of the present invention is to provide a cage that facilitates manufacture even for model numbers in which it has been difficult to form a pocket by punching using a press, and a self-centering apparatus equipped with such a cage. It is in providing a roller bearing.

  A cage for a self-aligning roller bearing according to the present invention comprises a first annular body on one side in the axial direction of the cage, a second annular body on the other side in the axial direction of the cage, and the first annular body A plurality of columns connecting the second annular body, and a rolling element between the first annular body and the second annular body and between the columns adjacent in the circumferential direction A cage for a self-aligning roller bearing which is a pocket for accommodating a certain roller, wherein a pocket surface which is a side surface of the first annular body and which constitutes the pocket is a plane, and a pitch of a plurality of the rollers When the roller is disposed in the pocket in a reference state in which the central axis of the circle is aligned with the central axis of the cage and the roller is disposed between the inner ring raceway and the outer ring raceway, the pocket surface In each of the pockets not parallel to the end face of the roller and included in the plurality of pockets, An imaginary plane that includes the pocket surface on one side of the direction and extends to the cage center axis side is an axial direction of the cage than an arc portion on the opposite side of the second annular body that is 180 degrees away from the pocket Pass the other side of the

  According to this cage, the punch is punched on the opposite side across the cage central axis with respect to the portion forming the pocket (hereinafter referred to as "pocket forming portion") in order to punch out the pocket by press forming. It is possible to arrange a part of the punch, and the punch does not have to be L-shaped as in the prior art, and the punch can be punched by moving the punch linearly toward the pocket forming portion. Therefore, manufacture becomes easy also about the cage of the model number which was difficult to form a pocket conventionally by punching by a press. Also, the mold structure is simplified.

  In addition, the cage is suitable for a large-sized or super-sized self-aligning roller bearing. A cage for a large or super large spherical roller bearing has a large thickness and it is particularly difficult to form a pocket by punching with a press, but the cage facilitates manufacture. The force required for punching can be small.

  The large-sized or super-sized spherical roller bearings (rolling bearings) are rolling bearings defined in JIS B 0104, and "large" is a bearing with a nominal bearing outer diameter of 180 mm to 800 mm. Yes, “super-sized” is a bearing whose nominal bearing outer diameter exceeds 800 mm.

  The self-aligning roller bearing of the present invention is an annular ring which holds the inner ring, the outer ring, a plurality of rollers interposed between the inner ring and the outer ring, and a plurality of the rollers spaced in the circumferential direction. And a cage, wherein the cage includes a first annular body on one side in the axial direction of the cage, a second annular body on the other side in the axial direction of the cage, the first annular body, and the first And a plurality of columns connecting the two annular bodies, wherein the rollers are accommodated between the first annular body and the second annular body which are circumferentially adjacent to each other. A pocket, which is a side surface of the first annular body and constituting a pocket, is a flat surface, and the central axis of the pitch circle of the plurality of rollers is aligned with the central axis of the cage, When the roller is disposed in the pocket in a reference state disposed between the track of the inner ring and the track of the outer ring Further, the pocket surface is not parallel to the end surface of the roller, and each pocket included in the plurality of pockets includes the pocket surface on one side in the axial direction of the cage and is extended to the central axis of the cage. The plane passes through the other axial side of the cage than the opposite arc portion of the second annular body which is 180 degrees away from the corresponding pocket.

  According to the cage provided with the self-aligning roller bearing, the cage is formed with respect to the portion forming the pocket (hereinafter referred to as "pocket forming portion") in order to punch out and form the pocket by a press. It becomes possible to arrange a part of the punch on the opposite side across the central axis, and it is not necessary to make the punch L-shaped as in the prior art, and by moving the punch linearly toward the pocket forming portion Punching is possible. Therefore, the cage of the model number that has been difficult to form a pocket by punching with a press is easy to manufacture, and the force required for punching may be small.

  Further, it is preferable that the self-aligning roller bearing is a large or super-sized self-aligning roller bearing. A cage for a large or super large spherical roller bearing has a large thickness and it is particularly difficult to form a pocket by punching with a press, but the cage facilitates manufacture. The force required for punching can be small.

  According to the present invention, the cage of the model number which has conventionally been difficult to form a pocket by punching with a press can be easily manufactured, and the force required for punching can be small. As a result, it can contribute to the reduction of the manufacturing cost.

It is a sectional view showing an example of a self-aligning roller bearing of the present invention. It is a perspective view of a holder. It is sectional drawing in the surface containing the central axis of a holder | retainer. It is an explanatory view showing a situation at the time of forming a pocket. It is sectional drawing of the holder | retainer which formed the pocket by the punch shown in FIG. It is sectional drawing of the conventional self-aligning roller bearing. It is sectional drawing of the conventional holder. It is explanatory drawing of the prior art which shows a mode that punched out the pocket by a punch.

[Overall Configuration of Spherical Roller Bearing]
FIG. 1 is a cross-sectional view showing an example of a self-aligning roller bearing of the present invention. The self-aligning roller bearing 10 includes an inner ring 11, an outer ring 12, a plurality of rollers (rolling elements) 13 interposed between the inner ring 11 and the outer ring 12, and two annular cages 14. The self-aligning roller bearing 10 further includes an annular guide ring 15, and two rows of rollers 13 are disposed on both sides in the axial direction of the guide ring 15, and two cages 14 are also provided in each row There is. And self-aligning roller bearing 10 of this embodiment is a large-sized or super-sized rolling bearing. The large-sized or super-sized self-aligning roller bearings (rolling bearings) are those defined by JIS B 0104. Specifically, "large" is a bearing whose nominal bearing outer diameter is from 180 mm to 800 mm, and "super-large" is a bearing whose nominal bearing outer diameter exceeds 800 mm.

  The outer ring 12 has a single outer raceway surface 18 formed on the inner periphery, and is symmetrical (left and right symmetrical in FIG. 1) on one axial side of the rolling bearing and the other axial side of the rolling bearing. The axial direction of the self-aligning roller bearing 10 is hereinafter referred to as “axial direction of the rolling bearing”. The outer raceway surface 18 is a concave surface and has a shape along a spherical surface having a predetermined radius from a point on the bearing center axis C1 (the bearing center point Q (point coinciding with the operating point)).

  The inner ring 11 has two rows of inner raceways 16 formed on the outer periphery, and is symmetrical (left and right symmetrical in FIG. 1) on one side and the other side in the axial direction. The inner raceway surface 16 is a concave surface, and as shown in FIG. 1, the shape of the inner raceway surface 16 is a circular arc in the cross section including the bearing center axis C1. The arc has a radius substantially the same as the radius of the spherical surface forming the outer raceway surface 18. A cylindrical surface 17 is formed between the two rows of inner raceways 16, 16, and the cylindrical surface 17 is a cylindrical surface centered on the bearing central axis C1.

  The rollers 13 are disposed in two rows between the inner ring 11 and the outer ring 12, and the plurality of rollers 13 included in each row roll on the inner raceway surface 16 and the outer raceway surface 18, respectively. Each roller 13 is a convex roller (spherical roller). Specifically, each roller 13 included in the row on one side in the axial direction of the rolling bearing has a convex curved outer peripheral surface 20 and an end face 21 on one side in the axial direction (outside in the axial direction) of the rolling bearing. And an end face 22 on the opposite side (axially inner side). The same shape is also applied to each roller 13 included in the row on the other side in the axial direction of the rolling bearing, and a convex curved outer peripheral surface 20 and an end face 21 on the other side (the outer side in the axial direction) of the rolling bearing in the axial direction And an end face 22 on the opposite side (axially inner side). Hereinafter, the end surfaces 21 and 22 of the roller 13 will be referred to as "roller end surfaces 21 and 22".

  Two cages 14 are also provided on one side of the rolling bearing in the axial direction and on the other side of the rolling bearing in the axial direction so as to correspond to the two rows of rollers 13. Hold the plurality of rollers 13 included in the column. For this purpose, each cage 14 has a plurality of pockets 34 for accommodating the rollers 13 along the circumferential direction. The cage 14 on one side in the axial direction of the rolling bearing and the cage 14 on the other side in the axial direction of the rolling bearing can rotate independently. In the present embodiment, the cage 14 on one side in the axial direction of the rolling bearing and the cage 14 on the other side in the axial direction of the rolling bearing have the same shape. The detailed configuration of the holder 14 will be described later.

  The guide ring 15 is an annular member, and is provided on the outer peripheral side of the cylindrical surface 17 of the inner ring 11. The guide ring 15 is between the roller 13 on one side in the axial direction of the rolling bearing and the roller 13 on the other side in the axial direction of the rolling bearing, and the inner ring 11 (cylindrical surface 17) and the cage 14 (annular body described later) 32) and provided.

  The self-aligning roller bearing 10 having the above configuration is a large (or super large) self-aligning roller bearing, and can allow inclination of the central axes of the inner ring 11 and the outer ring 12 to each other. . In a state in which the central axes of the inner ring 11 and the outer ring 12 coincide with each other, the inner ring 11, the outer ring 12, the plurality of rollers 13 in two rows, the two cages 14, and the guide ring 15 It has a configuration that is symmetrical (left and right symmetrical in FIG. 1) with the other side of the rolling bearing in the axial direction.

  In the present embodiment, the inner ring 11, the outer ring 12, and the rollers 13 are bearing steels, and the guide wheels 15 are cast iron. Since the spherical roller bearing 10 is large (or super large), the cage 14 also has a large diameter (outer diameter) and a relatively thick wall. As will be described later, the cage 14 is made of a carbon steel plate, and the pockets 34 for holding the rollers 13 are formed by punching using a punch 50 (see FIG. 4) using a press.

[Configuration of Cage 14]
The cage 14 on one side in the axial direction of the rolling bearing and the cage 14 on the other side in the axial direction of the rolling bearing have the same configuration, but the mounting directions are opposite in the axial direction. In the cage 14 on one side of the rolling bearing in the axial direction, one side of the rolling bearing in the axial direction coincides with one side of the cage in the axial direction, and the other side of the rolling bearing in the axial direction is the other side of the cage in the axial direction Match In cage 14 on the other axial side of the rolling bearing, the other axial side of the rolling bearing coincides with one axial side of the cage, and one axial side of the rolling bearing is the other axial side of the cage Match The structure and manufacture of the cage 14 will be described below by taking the cage 14 on one side in the axial direction of the rolling bearing as an example. Hereinafter, the cage 14 on one side in the axial direction of the rolling bearing is referred to as a "first cage 14". Further, the roller 13 on one side in the axial direction of the rolling bearing is referred to as "first roller 13". In addition, the cage 14 on the other side in the axial direction of the rolling bearing is referred to as a "second cage 14". Further, the roller 13 on the other side in the axial direction of the rolling bearing is referred to as "second roller 13". The first cage 14 includes a first annular body (annular portion) 31 on one side in the axial direction of the cage, a second annular body (annular portion) 32 on the other side in the axial direction of the cage, and A plurality of columns (columns) 33 connecting the one annular body 31 and the second annular body 32 are provided. Between the first annular body 31 and the second annular body 32 and between the pillars 33 33 adjacent in the circumferential direction is a pocket 34 that accommodates the roller 13. One roller 13 is accommodated in each pocket 34, whereby the first cage 14 can hold the plurality of rollers 13 at intervals in the circumferential direction.

  Here, as shown in FIG. 1, the central axes of the inner ring 11 and the outer ring 12 coincide with each other, and the central axis of the pitch circle of the plurality of rollers 13 held by the first cage 14 is A state in which the plurality of rollers 13 are disposed between the raceway of the inner ring 11 and the raceway of the outer ring in such a manner as to coincide with the central axis C2 (see FIG. 2) of the first cage 14 is referred to as a “reference state”. Furthermore, in this reference state, the roller 13 is not skewed in the pocket 34. Then, in the reference state, the contact angle at which the roller 13 contacts the inner ring 11 (and the outer ring 12) is “α”. The "pitch circle" is a circle passing through the center points P0 of the plurality of rollers 13 included in each row.

  FIG. 3 is a cross-sectional view in a plane including the central axis C2 of the first cage 14 and shows the first cage 14 and the roller 13 in the reference state. In FIG. 3, the roller 13 is shown by a broken line. The first annular body 31 has an annular portion (referred to as an annular portion 35) extending radially inward. The second annular body 32 has a short cylindrical shape. The inner peripheral side of the annular portion 35 of the first annular body 31 is capable of sliding contact with a portion (a portion of the inner raceway surface 16) of the outer peripheral surface of the inner ring 11 (see FIG. 1). The inner peripheral side of 32 can come in sliding contact with the outer peripheral surface of the guide ring 15 (see FIG. 1), whereby the positioning of the first cage 14 in the radial direction is lined by the inner ring 11 (and the guide ring 15). It will be.

  The first annular body 31 has a smaller outer diameter than the second annular body 32, and also has a smaller inner diameter. For this purpose, the column 33 has a shape which is bent in the radial direction halfway in the longitudinal direction. Specifically, the column 33 is a linear column portion 41 provided along a virtual surface K1 that is (substantially) cylindrical around a central axis C2 (see FIG. 2) of the first cage 14. And an inclined column portion 42 provided along a tapered virtual surface K2 inclined with respect to the central axis C2 (see FIG. 2). The virtual surface K1 of the present embodiment is not a strictly cylindrical shape centered on the central axis C2, but is a tapered surface which is inclined at a minute angle (1 to 5 degrees) with respect to the central axis C2. The virtual surface K2, which is tapered, has a larger inclination angle based on the central axis C2 than the virtual surface K1. The virtual surface K1 is an inclined tapered surface whose diameter increases as it proceeds from one axial side of the cage to the other axial side of the cage. The virtual surface K2 is an inclined tapered surface whose diameter increases from one axial side of the cage to the other axial side of the cage.

  As shown in FIGS. 2 and 3, the side surface of the first annular body 31 on the other side in the axial direction of the cage serves as the first pocket surface 36 constituting the pocket 34, and the second annular body 32 holds The side surface on one side in the axial direction of the container serves as a second pocket surface 37 constituting the pocket 34. The circumferential side surface of each of the pair of pillars 33 adjacent in the circumferential direction is the third pocket surface 38 that constitutes the pocket 34. That is, a space formed by being surrounded by the first pocket surface 36, the second pocket surface 37, and the pair of third pocket surfaces 38 is the pocket 34.

  In FIG. 3, in the reference state, a gap is formed between the first pocket surface 36 and the roller end surface 21 on one side in the axial direction of the cage. For example, the first roller 13 is in the axial direction of the cage The roller end surface 21 contacts the first pocket surface 36 when moving to one side of the first pocket surface 36. In the reference state, a gap is formed between the second pocket surface 37 and the roller end surface 22 on the other side in the axial direction of the cage. For example, the first roller 13 is the other in the axial direction of the cage When moving to the side, the roller end surface 22 contacts the second pocket surface 37. The first pocket surface 36 and the second pocket surface 37 limit axial movement of the roller 13 in the cage.

  As will be described later, the pocket 34 is punched out by a punch 50 (see FIG. 4) using a press. For this reason, the first pocket surface 36 and the second pocket surface 37 become flat surfaces (punched surfaces), respectively. The third pocket surface 38 is also flat (punched surface) except for a part. A convex portion 39 is formed at the center of the third pocket surface 38 in order to prevent the roller 13 from falling outward in the radial direction when assembling the self-aligning roller bearing 10, and the convex portion 39 The recess 40 is formed on the inner side in the radial direction of FIG. The protrusion 39 is formed simultaneously with the formation (punching process) of the pocket 34. The recess 40 is formed by another process after the formation of the pocket 34.

  As shown in FIG. 3, the roller end surfaces 21 and 22 on one side in the axial direction of the cage and the other side in the axial direction on the cage are planes orthogonal to the central axis C3 of the first roller 13, and Roller end faces 21 and 22 are parallel. On the other hand, in the reference state, the first pocket surface 36 and the second pocket surface 37 are not formed along a plane orthogonal to the central axis C3 of the first roller 13, and relative to the central axis C3. It is formed along an inclined plane. Therefore, when the first roller 13 is disposed in the pocket 34 as the reference state, the first pocket surface 36 becomes non-parallel (not parallel) with the roller end surface 21 and the second pocket surface 37 is the roller end surface 22 non-parallel (not parallel). The first pocket surface 36 and the second pocket surface 37 are parallel to each other.

  The third pocket surface 38 can contact the outer circumferential surface 20 of the roller 13, but in the present embodiment, the third pocket surface 38 can contact the widest possible range along the shape of the outer circumferential surface 20 as described below The first roller 13 and the first cage 14 can be stabilized in posture with each other. That is, the virtual surface K2 that is tapered is parallel (substantially parallel) to the central axis C3 of the first roller 13 in the reference state, and is located radially outward of the central axis C3. The intersection of the tapered virtual surface K2 and the substantially cylindrical virtual surface K1, that is, the intersection of the linear column 41 and the inclined column 42 (at the intersection point P1), the center point of the first roller 13 It is set near P0. In the present embodiment, the intersection point P1 is located closer to the other axial side of the cage than the central point P0. According to the column 33 (third pocket surface 38) having such a configuration, the outer circumferential surface 20 of the roller 13 is convexly curved as described above, but the third pocket surface 38 is the outer circumferential surface 20. It is possible to have a shape that conforms as much as possible, and to contact the outer circumferential surface 20 of the first roller 13 as wide as possible.

  The virtual surface K1 having a substantially cylindrical shape and the virtual surface K2 having a taper shape intersect, and in the present embodiment, the crossing angle (border angle) B between them is substantially the same as the contact angle α (B Α α). The crossing angle B may be set within a range of ± 5 degrees of the contact angle α (α−5 ≦ B ≦ α + 5) except that the crossing angle B matches the contact angle α. In the present embodiment, the inclined column portion 42 has a linear shape along the tapered virtual surface K2, but may have an arc shape which is convex outward in the radial direction.

  The concave portion 40 of the third pocket surface 38 is formed at a position opposed to the range including the point (inflection point) where the diameter is the largest in the outer circumferential surface 20 of the convex curved surface roller 13 The recess 40 is not in contact with the outer circumferential surface 20. This prevents the roller 13 from contacting the third pocket surface 38 at one of the points (inflection point). That is, the outer circumferential surface 20 of the roller 13 can be brought into contact with a wide range of two or more places of the third pocket surface 38, whereby the posture of the roller 13 can be stabilized.

[Manufacture of cage 14]
The cage 14 for the large (or super large) self-aligning roller bearing 10 as described above is manufactured as follows. First, the steel plate is plastically deformed by pressing to form a wedge shape, and the bottom portion of the wedge shaped steel plate is punched out by a press to form a ring-shaped intermediate product. This provides the overall contour of the retainer 14 which is annular (pocket 34 not formed). Alternatively, the steel plate which is already in an annular shape may be plastically deformed by a press to obtain the overall contour shape of the cage 14 (an intermediate product in an annular shape).

  Then, a pocket 34 is formed for this intermediate product. FIG. 4 is an explanatory view showing a state when the pocket 34 is formed. Each pocket 34 is formed by punching the punch 50. After punching, burrs may occur at the edge of the pocket 34, and processing is performed to remove the burr. From the above, the steel cage 14 is completed.

  Portions of the pockets 34 left after being punched out (between the circumferentially adjacent pockets 34) become pillars 33. The pillars 33 have the linear pillars 41 and the inclined pillars 42 as described above (see FIG. 3), and the cross-sections of the linear pillars 41 and the inclined pillars 42 are linear. For this reason, when forming a steel plate into a wedge shape or forming an annular-shaped intermediate product from an annular steel plate by using a press as described above, a part of the column 33 is formed into an arc shape that is convex. Compared to the case, the press load can be reduced, and shape control (dimension management) is also facilitated.

  The press installation which forms the pocket 34 is concretely demonstrated by FIG. A receiving mold 52 is installed at the lower part, and a punch 50 having a linear shape is installed above it, and an actuator (not shown) for generating a downward thrust force on the punch 50 is installed on the punch 50 A press body 51 is provided. Then, a part of the intermediate product 49 in the circumferential direction, that is, a processing target portion forming the pocket 34 (hereinafter referred to as a “pocket forming portion 48”) is fixed on the receiving mold 52. The punch 50 is moved downward and a part of the pocket forming portion 48 is punched out to form the pocket 34.

  As mentioned above, the press installation which arranged the press main body 51 provided with the said actuator, the punch 50, and the receiving mold 52 along one straight line (along with one straight line along a perpendicular direction in this embodiment) To form the pocket 34. Once one pocket 34 is formed, the intermediate product 49 is rotated in the circumferential direction about one pitch of the pocket 34, fixed to the receiving mold 52, and the next pocket 34 is formed. By repeating this, the cage 14 in which the plurality of pockets 34 are formed along the circumferential direction is obtained.

  Thus, each pocket 34 obtained by the press installation shown in FIG. 4 has the following configuration. That is, in the holder 14 shown in FIG. 5, in one pocket 34 (hereinafter also referred to as “processed pocket 34”) formed in the lower part by the punch 50 (see FIG. 4), one of the axial directions of the holder The side first pocket surface 36 is constituted by a plane. Then, a virtual plane including the first pocket surface 36 which is a plane and extended to the central axis C2 side of the holder 14 is taken as a “(first) virtual plane K3”. In the cross-sectional view shown in FIG. 5, the imaginary plane K3 of the machined pocket 34 is opposite to the machined pocket 34 of the second annular body 32 of the holder 14 and 180 degrees away from the central axis C2. The arc portion 47 passes through the other side in the axial direction of the cage (located on the other side of the arc portion 47 in the axial direction of the cage). The other pockets 34 have the same configuration. FIG. 5 is a cross-sectional view of the cage 14 in which the pocket 34 is formed by the punch 50 shown in FIG. 4 and shows a cross-section in a plane including the central axis C2 of the cage 14.

  Further, in FIG. 5, in the processed pocket 34, the second pocket surface 37 on the other side in the axial direction of the cage is formed by a flat surface, like the first pocket surface 36. The second pocket surface 37 is present on the other side of the first pocket surface 36 in the axial direction of the cage, and thus, it is needless to say that in the cross-sectional view shown in FIG. And a virtual plane K4 extending toward the central axis C2 side of the cage 14 as “(second) virtual plane K4”, the virtual plane K4 is closer to the axial direction of the cage than the arc portion 47. Pass the other side (located on the other side of the arc portion 47 in the axial direction of the cage). The other pockets 34 have the same configuration. Because of this processing, the first pocket surface 36 and the second pocket surface 37 are parallel, and the first virtual plane K3 and the second virtual plane K4 are parallel.

  As described above, the holder 14 of the present embodiment has the following configuration. That is, the first pocket surface 36 which is the side surface of the first annular body 31 and constitutes the pocket 34 is a "punched surface" obtained by punching out by the punch 50, and this "punched surface" is a flat surface. When the roller 13 is disposed in the pocket 34 in the reference state (see FIG. 3), the first pocket surface 36 is not parallel to the roller end surface 21 on one side in the axial direction of the cage. A plurality of pockets 34 are formed in the cage 14, and each pocket 34 included in the pockets 34 includes a first pocket surface 36 on one side in the axial direction of the cage and extends toward the central axis C2 side The imaginary plane K3 passes through the other side of the axial direction of the cage in the second annular body 32 from the arc portion 47 on the opposite side apart from the pocket 34 by 180 degrees (the axis of the cage of the arc portion 47 Located on the other side of the direction).

  According to the holder 14 having such a configuration, the pocket 34 is punched out by a press as described with reference to FIG. It becomes possible to arrange the part 50a of the punch 50 on the opposite side across the central axis C2, and it is not necessary to make the punch 50 L-shaped as in the conventional case (see FIG. 8). By moving linearly toward the pocket forming portion 48, punching can be performed. In the present embodiment shown in FIG. 4, the direction of the thrust applied to the punch 50 by the actuator provided in the press body 51 coincides with the direction in which the punch 50 punches out the pocket 34 on the same straight line. On the other hand, in the conventional example shown in FIG. 8, the direction in which the press body 102 depresses the punch 100 and the direction in which the punch 100 punches the pocket 96 do not coincide on the same straight line and are parallel.

  For this reason, according to the present embodiment shown in FIG. 4, when the pocket 34 is punched downward, the reaction force acts on the punch 50, but the press (the actuator) pushes down the punch 50 against the reaction force. be able to. Therefore, the cage 14 of a model number in which it is difficult to form a pocket by punching with a press (FIG. 8) is easy to manufacture, and the force (pressing force) required for punching may be small. As a result, it can contribute to the reduction of the manufacturing cost of the holder 14.

  In addition, the self-aligning roller bearing 10 of the present embodiment is large or super large as described above, and hence the cage 14 also has a large diameter. The cage 14 for the large or super large spherical roller bearing 10 has a large thickness (for example, a thickness of 5 mm or more and 12 mm or less), and it is particularly difficult to form the pocket 34 by punching using a press. is there. However, in the present embodiment, as described above, since the press main body 51 provided with the actuator for punching out the pocket 34, the punch 50, and the press equipment in which the receiving mold 52 is disposed along one straight line, the actuator The direction of pushing down the punch 50 and the direction of punching out the pocket 34 by the punch 50 coincide on the same straight line. Therefore, by moving the punch 50 linearly toward the pocket forming portion 48, punching can be performed, formation of the pocket 34 becomes easy, and the force required for punching can be small.

  The embodiments disclosed above are illustrative and non-restrictive in every respect. That is, the cage and the rolling bearing of the present invention are not limited to the illustrated embodiment but may be other embodiments within the scope of the present invention. Although the said embodiment demonstrated the case where the spherical roller bearing 10 was large (or super-large), it may be a medium-sized or small-sized rolling bearing.

10: Rolling bearing 11: inner ring 12: outer ring 13: roller (rolling element) 14: cage 21: roller end surface 22: roller end surface 31: first annular body 32: second annular body 33: post 34: pocket 36: second One pocket side (pocket side)
47: Arc part C2: Central axis of cage K3: Virtual plane

Claims (4)

A plurality of columns connecting a first annular body on one side in the axial direction of the cage, a second annular body on the other side in the axial direction of the cage, and the first annular body and the second annular body And a self-aligning roller bearing having a pocket for accommodating a roller, which is a rolling element, between the first annular body and the second annular body and between circumferentially adjacent pillars. The cage of the
A pocket surface which is a side surface of the first annular body and which constitutes the pocket is a flat surface,
When the rollers are arranged in the pocket in a reference state in which the central axis of the pitch circle of the plurality of rollers is aligned with the central axis of the cage and the rollers are disposed between the inner ring raceway and the outer ring raceway The pocket surface is not parallel to the end surface of the roller,
In each of the pockets included in the plurality of pockets, an imaginary plane including the pocket surface on one side in the axial direction of the cage and extending toward the central axis of the cage is 180 degrees with the pocket of the second annular body A retainer for a self-aligning roller bearing, which passes through the other axial side of the retainer more than the remote arc on the opposite side.   The cage according to claim 1, which is for a large or super large spherical roller bearing. An inner ring, an outer ring, a plurality of rollers interposed between the inner ring and the outer ring, and an annular cage holding the plurality of rollers at intervals in the circumferential direction,
The cage connects a first annular body on one side in the axial direction of the cage, a second annular body on the other side in the axial direction of the cage, the first annular body, and the second annular body Between the first annular body and the second annular body, and between the adjacent pillars in the circumferential direction is a pocket for accommodating the rollers,
A pocket surface which is a side surface of the first annular body and which constitutes the pocket is a flat surface,
The rollers are arranged in the pocket in a reference state in which the central axis of the pitch circle of the plurality of rollers is aligned with the central axis of the cage and the rollers are disposed between the inner ring raceway and the outer ring raceway. If so, the pocket surface is not parallel to the end surface of the roller,
In each of the pockets included in the plurality of pockets, an imaginary plane including the pocket surface on one side in the axial direction of the cage and extending toward the central axis of the cage is 180 degrees with the pocket of the second annular body Self-aligning roller bearing that passes through the other axial side of the cage rather than the remote arc on the opposite side.   The spherical roller bearing according to claim 3, which is a large-sized or super-sized spherical roller bearing.

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