JP2018194014A - Method of manufacturing cylindrical roller bearing and holder - Google Patents

Abstract

To provide a cylindrical roller bearing which can increase a number of rollers without increasing bearing size, and can prevent the cylindrical roller from coming off at the time of being assembled to an outer diameter side member while avoiding an interference with a collar provided on an inner peripheral surface of the outer diameter side member.SOLUTION: A cylindrical roller bearing 1 is equipped with an inner ring 2; a plurality of cylindrical rollers 3; and a holder 4. The holder 4 has a cylindrical roller holding portion 10 formed with a plurality of pockets 10 storing the cylindrical roller 3; a side surface portion 11 which extends from an axial end portion on the opposite side to a side on which a collar 5b of an outer diameter side member 5 in the roller holding portion 10 exists to an outer diameter side; and a plurality of coming-off preventive portions 12 which axially extends from the side surface portion 11 to the side on which the collar 5b exists. Each coming-off preventive portion 12 is positioned between the adjacent cylindrical rollers 3. The roller holding portion 10 is positioned on an inner diameter side than a pitch circle of an array of the cylindrical roller 3, and the coming-off preventive portion 12 is positioned on the outer diameter side than the pitch circle.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cylindrical roller bearing of a type that does not have an outer ring, for example, a cylindrical roller bearing used for a speed increaser of a wind power generator, and a method for manufacturing a cage.

  A planetary gear device is used for a speed increaser of a wind power generator. As a bearing for supporting the planetary gear of the planetary gear device, a cylindrical roller bearing having a high load capacity for radial load is mainly used. In order to reduce the diameter of the planetary gear and reduce the size of the entire speed reducer, as shown in FIG. 18, the cylindrical roller bearing 1 that supports the planetary gear 39 is replaced with the inner ring 2, the cylindrical roller 3, and the cage. A speed increaser having a configuration with no outer ring composed of 4 is also in practical use. In the case of the cylindrical roller bearing 1 without the outer ring, the cylindrical roller 3 rolls on the raceway surface formed on the inner diameter surface of the planetary gear 39. In the example of FIG. 18, two cylindrical roller bearings 1 are arranged side by side in the axial direction.

  Patent Document 1 proposes a roller with a cage suitable for supporting a planetary gear of a planetary gear device. The cage of this roller with a cage is shaped so that the roller does not fall off to the inner diameter side or the outer diameter side. In addition, Patent Documents 2 to 4 propose a cage having a shape that can prevent the roller from dropping off, and a manufacturing method thereof. Patent Document 2 relates to a cage for a thrust roller bearing, and Patent Documents 3 and 4 relate to a cage for a needle roller bearing.

  As described in Patent Document 4, a bearing cage produced in particular in large quantities is manufactured by punching out a pocket or the like of the cage by pressing from the viewpoint of production cost. Further, as described in Patent Document 2, bending by press such as coining is used in the bending process of the cage. Generally, a cage is manufactured by pressing or cutting.

Japanese Patent Laid-Open No. 2005-24018 JP 2006-57742 A JP 2004-353809 A JP 2014-29212 A

  As described above, the reduction gear can be reduced in size by using the cylindrical roller bearing without an outer ring for supporting the planetary gear. In order to further reduce the size of the reduction gear, it has been studied to reduce the size of the cylindrical roller bearing 1 without an outer ring. In that case, in order to reduce the bearing size while maintaining the load capacity, it is necessary to increase the number of rollers. However, in the standard cylindrical roller bearing 1 shown in FIG. 19, if the number of rollers is simply increased, the cross-sectional area of the column portion 10d of the cage 4 becomes small, and there is a concern that the strength of the cage 4 is insufficient. The The standard cylindrical roller bearing 1 refers to a bearing in which the column portion 10d of the cage 4 is positioned on the pitch circle PC (pitch circle diameter PCD) in the arrangement of the cylindrical rollers 3.

  As a countermeasure against insufficient strength of the cage 4, as shown in FIG. 20, by arranging the column portion 10 d of the cage 4 on the outer diameter side of the pitch circle PC, the cross-sectional area of the column portion 10 d of the cage 4. It is conceivable to increase the number of rollers by narrowing the distance between the rollers without making the diameter extremely small. However, since the flange 39a for restricting the axial position of the cylindrical roller 3 is provided on the inner diameter surface of the planetary gear 39, the column portion 10d disposed on the outer diameter side of the pitch circle PC interferes with the collar 39a. Resulting in. Therefore, it is difficult to arrange the column portion 10d of the cage 4 on the outer diameter side of the pitch circle PC.

In addition, as shown in FIG. 21, by arranging the column portion 10d of the cage 4 on the inner diameter side of the pitch circle PC, the distance between the rollers can be reduced and the number of rollers can be increased. However, in this case, when the cylindrical roller bearing 1 is incorporated in the planetary gear 39, there is a problem that the cylindrical roller 3 falls off to the outer diameter side. For this reason, when arrange | positioning the pillar part 10d of the holder | retainer 4 in the inner diameter side rather than the pitch circle PC, it is necessary to devise the shape of the holder | retainer 4 so that the cylindrical roller 3 may not drop | omit to an outer diameter side.
The subject of the cylindrical roller bearing of the type having no outer ring is not limited to the one in which the planetary gear device of the speed increaser of the wind power generator is used, but can be said to be used in general applications.

  In addition, the roller with a cage described in Patent Document 1 prevents the roller from coming off to the outer diameter side by the column part, and prevents the roller from coming off to the inner diameter side by a roller holding claw provided separately from the column part. Do.

The object of the present invention is to increase the number of rollers without increasing the bearing size, and to avoid the interference with the flange provided on the inner peripheral surface of the outer diameter side member. It is an object of the present invention to provide a cylindrical roller bearing that can prevent the cylindrical roller from dropping off when the cylinder is assembled.
Another object of the present invention is to provide a manufacturing method capable of efficiently and inexpensively manufacturing a cage used in the cylindrical roller bearing.

The cylindrical roller bearing according to the present invention includes an inner ring, a plurality of cylindrical rollers, and a cage, an outer diameter side raceway surface is formed on the inner peripheral surface, and the outer diameter side raceway surface projects from one axial side to the inner diameter side. The outer diameter so that the cylindrical roller rolls on the outer diameter side raceway surface in the outer diameter side member having a collar, and the axial position of the cylindrical roller is regulated by the collar of the outer diameter side member. Built into the side member.
In this cylindrical roller bearing, the retainer is positioned on the inner diameter side of the pitch circle of the arrangement of the cylindrical rollers, and a cylindrical roller holding portion in which a plurality of pockets for accommodating the cylindrical rollers are formed, and the rollers A side surface portion extending from the axial end opposite to the flange side of the outer diameter side member in the holding portion to the outer diameter side, and the collar from the position on the outer diameter side of the pitch circle in the side surface portion. It has a plurality of retaining portions that extend in the axial direction to a certain side and are positioned between the adjacent cylindrical rollers and restrict the cylindrical rollers from dropping off to the outer diameter side.

  This cylindrical roller bearing is composed of an inner ring, a cylindrical roller, and a cage, and does not have an independent outer ring as a bearing component. Therefore, the outer diameter of the cylindrical roller bearing is smaller than that of a cylindrical roller bearing having an outer ring. For this reason, the outer diameter side member in which the cylindrical roller bearing is incorporated, for example, a planetary gear can be reduced in size. Also, this type of bearing cannot be a full-roller type, and a cage is essential, but the roller holder of the cage is positioned on the inner diameter side of the pitch circle of the arrangement of cylindrical rollers. Can be made narrower and the number of rollers can be increased as compared with the case where is positioned on the pitch circle. Thereby, bearing size can be made small, maintaining load capacity.

  In this cylindrical roller bearing, since the roller holding portion is located on the inner diameter side of the pitch circle, the cage serves as an inner ring guide, and a load acting on the cage during operation is received by the roller holding portion. The retaining portion is only required to have a function of preventing the cylindrical roller from dropping off to the outer diameter side during assembling or the like. For this reason, even if the retaining portion has a cantilever support shape connected to one end of the roller holding portion via the side surface portion, there is no problem in strength. In addition, the retaining part extends in the axial direction from the side with the collar of the outer diameter side member to the side with the collar, so that it does not interfere with the collar regardless of the inner diameter of the collar. can do.

In the present invention, it is preferable that the retaining portion of the retainer is positioned at a tip end of the retainer on a side where the collar is present from an axial center of the cylindrical roller.
In this case, it is possible to reliably prevent the cylindrical roller from dropping off to the outer diameter side.

In this invention, the said side part of the said holder | retainer may have several isolation | separation parts which are located in the same phase of the circumferential direction between each said pocket, and are extended in the outer diameter side in the state mutually isolate | separated from each other. .
The side portion only needs to have a strength sufficient to support the retaining portion. Therefore, even if the side surface portion has a shape in which a circumferential portion between the pockets locally extends to the outer diameter side, there is no problem in strength. By adopting this shape, it is possible to reduce the weight of the cage while eliminating waste of materials as compared with the case where the entire side surface portion is formed into an annular shape.

In this invention, each thickness of the said side part and the said retaining part may be thinner than the thickness of the said roller holding part.
If the thickness of the side surface portion and the retaining portion is thin, the side surface portion and the retaining portion can be bent with a relatively small force, and the bending process can be performed easily and accurately.

A method of manufacturing a cage according to the present invention includes a roller holding portion formed with a plurality of pockets arranged in a circumferential direction in a cylindrical shape, a side portion extending from one end in the axial direction of the roller holding portion to an outer diameter side, and the side surface. And a retainer that extends from the circumferential position of the portion between the pockets at the outer diameter end of the portion toward the other end in the axial direction, and is applied to a cage in which cylindrical rollers are respectively accommodated in the plurality of pockets.
The method of manufacturing the cage includes a process of forming a plate material as a material into a cylindrical shape, and a portion serving as the roller holding portion of the cage that is located in the axially central portion of a cylindrically processed product. The process of machining the pocket by laser machining at a predetermined position of the workpiece, and the side part on the one end side in the axial direction of the machined part and the part serving as the retaining part are widened to the outer diameter side by spatula drawing. Forming a plurality of notches that are radially extended by laser processing and have outer diameter ends opened in the circumferential direction range of the pockets in the collar-shaped portion; and Bending the portion of the belt-shaped portion between the notches to the retaining portion of the retainer to the other end in the axial direction at an angle that does not hinder the operation of housing the cylindrical roller in the pocket; To the above After the cylindrical roller is housed, and a process to the missing portions as a stopper portion, the axial direction and the retaining portion is bent to become so in the other axial end parallel of said retainer.

  According to this cage manufacturing method, by adopting a spatula drawing process in the process of forming both sides in the axial direction of the product being processed into a collar shape, there is no need for a mold, and if there is no major design change, a special manufacturing process is required. The design of the cage can be changed without tools. In addition, since no mold is required, cost can be reduced. In particular, it is advantageous when the cage is produced in small quantities. Furthermore, by processing the pocket and the retaining portion by laser processing, the shape of the pocket and the retaining portion can be processed freely and easily. Although the cage can be manufactured by shaving, the amount of shaving is large and both material cost and processing cost are high.

  The cylindrical roller bearing according to the present invention includes an inner ring, a plurality of cylindrical rollers, and a cage, an outer diameter side raceway surface is formed on the inner peripheral surface, and the outer diameter side raceway surface projects from one axial side to the inner diameter side. The outer diameter so that the cylindrical roller rolls on the outer diameter side raceway surface in the outer diameter side member having a collar, and the axial position of the cylindrical roller is regulated by the collar of the outer diameter side member. In the cylindrical roller bearing incorporated in the side member, the cage is located on the inner diameter side of the pitch circle of the arrangement of the cylindrical rollers, and a cylindrical roller holding portion in which a plurality of pockets for accommodating the cylindrical rollers are formed A side surface extending from the axial end opposite to the flange side of the outer diameter side member of the roller holding portion to the outer diameter side, and an outer diameter side of the pitch circle in the side surface portion. Extends axially from position to the side with the collar Since it has a plurality of retaining portions that are located between the adjacent cylindrical rollers and restrict the cylindrical rollers from falling off to the outer diameter side, the number of rollers can be increased without increasing the bearing size. In addition, it is possible to prevent the cylindrical roller from falling off when being assembled into the outer diameter side member while avoiding interference with the collar provided on the inner peripheral surface of the outer diameter side member.

  A method of manufacturing a cage according to the present invention includes a roller holding portion formed with a plurality of pockets arranged in a circumferential direction in a cylindrical shape, a side portion extending from one end in the axial direction of the roller holding portion to an outer diameter side, and the side surface. A retainer portion extending from the circumferential position of the portion between the pockets at the outer diameter end of the portion to the other end side in the axial direction, and a cylindrical roller is accommodated in each of the plurality of pockets. In the process of forming a plate material as a material into a cylindrical shape, and at a predetermined position of a portion that becomes the roller holding portion of the cage that is located in the axially central portion of the cylindrically processed intermediate product A process of machining the pocket by machining, and a process of forming the side part on the one end side in the axial direction of the halfway product and the part to be the retaining part to the outer diameter side by spatula drawing and forming into a collar shape , The part shaped like a collar A step of machining a plurality of notches extending in a radial direction by laser processing and having an outer diameter end opened in a circumferential range of the pocket in the pocket, and the retaining portion of the retainer in a belt-like portion between the notches Bending the portion to the other end side in the axial direction at an angle that does not hinder the operation of housing the cylindrical roller in the pocket, and after the cylindrical roller is received in the pocket, And a process of bending the part that becomes the retaining part to the other end side in the axial direction so as to be parallel to the axial direction to make the retaining part, the cage used for the cylindrical roller bearing can be efficiently and inexpensively Can be manufactured.

It is sectional drawing which shows the use condition of the cylindrical roller bearing which concerns on one Embodiment of this invention. It is a perspective view of the cylindrical roller bearing. (A) is sectional drawing of the holder | retainer of the cylindrical roller bearing, (B) is the IIIB-IIIB sectional drawing. FIG. 4 is a partially enlarged view of FIG. It is a perspective view of the retainer. It is VI-VI sectional drawing of FIG. It is explanatory drawing which shows the first half part of an example of the manufacturing method of a holder | retainer. It is explanatory drawing of the 3rd process in the manufacturing method of the same holder | retainer. It is explanatory drawing of the 4th process in the manufacturing method of the same holder | retainer. It is explanatory drawing of the 5th process in the manufacturing method of the same holder | retainer. It is explanatory drawing which shows the latter half part of the manufacturing method of the same holder | retainer. It is sectional drawing which shows the other form of a holder | retainer. It is sectional drawing which shows the further another form of a holder | retainer. It is explanatory drawing which shows the first half part of the example from which the manufacturing method of a holder | retainer differs. It is explanatory drawing which shows the latter half part of the manufacturing method of the same holder | retainer. It is sectional drawing of the step-up gear of the wind power generator using the cylindrical roller bearing shown in FIG. It is XVII-XVII sectional drawing of FIG. It is the perspective view which fractured | ruptured and represented the part which shows the state in which the cylindrical roller bearing was integrated in the planetary gear. (A) is sectional drawing which shows the assembly state of a standard type cylindrical roller bearing, (B) is the XIXB-XIXB sectional drawing. (A) is sectional drawing which shows the incorporating state of the 1st improvement type cylindrical roller bearing, (B) is the XXB-XXB sectional drawing. (A) is sectional drawing which shows the incorporating state of the 2nd improvement type cylindrical roller bearing, (B) is the XXIB-XXIB sectional drawing.

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view showing a use state of a cylindrical roller bearing according to an embodiment of the present invention, and FIG. 2 is a perspective view of the cylindrical roller bearing. The cylindrical roller bearing 1 includes an inner ring 2 having an inner ring raceway surface 2a formed on an outer peripheral surface, a plurality of cylindrical rollers 3 that roll on the inner ring raceway surface 2a, and a cage 4 that holds the plurality of cylindrical rollers 3. With.

  As shown in FIG. 1, the cylindrical roller bearing 1 is incorporated in the inner periphery of the outer diameter side member 5. The outer diameter side member 5 is a planetary gear used for a speed increaser of a wind power generator, for example. An outer diameter side raceway surface 5a is formed on the inner peripheral surface of the outer diameter side member 5, and each cylindrical roller 3 of the cylindrical roller bearing 1 rolls on the outer diameter side raceway surface 5a. A flange 5b is provided on one side in the axial direction of the outer diameter side member 5 so as to protrude from the inner peripheral surface to the inner diameter side. The collar 5b regulates the axial position of the cylindrical roller 3 by contacting the end surface of the cylindrical roller 3.

3A is a cross-sectional view of the cage 4, FIG. 3B is a IIIB-IIIB cross-sectional view thereof, and FIG. 4 is a partially enlarged view of FIG. 3B. 3A shows a cross section taken along the line IIIA-IIIA of FIG. FIG. 5 is a perspective view of the cage.
The cage 4 includes a cylindrical roller holding portion 10 having a plurality of pockets 10 a for accommodating the cylindrical rollers 3, a side surface portion 11 extending from one end in the axial direction of the roller holding portion 10 to the outer diameter side, and the side surface portion 11. And a plurality of retaining portions 12 extending from the outer diameter end to the other axial end side. One end of the roller holding portion 10 with the side surface portion 11 is on the opposite side in the axial direction from the side where the flange 5b of the outer diameter side member 5 is provided.

  As shown in FIG. 3A, the roller holding portion 10 includes a pair of annular portions 10b, 10c facing each other in the axial direction, and a plurality of locations in the circumferential direction so as to connect the annular portions 10b, 10c. And 10 d of pillar parts provided in the. An opening surrounded by the adjacent column portion 10d and the annular portions 10b and 10c is the pocket 10a. The shape of the pocket 10a is a rectangle. The roller holding portion 10 is entirely located on the inner diameter side of the pitch circle PC (pitch circle diameter PCD) in the arrangement of the cylindrical rollers 3.

  As shown in FIGS. 3 (B) and 4, the side surface portion 11 is locally removed from the annular portion 11a connected to the roller holding portion 10 and the circumferential position of the column portion 10d in the annular portion 11a. It consists of a plurality of separation portions 11b extending radially on the radial side. The side surface portion 11 extends from the inner diameter side to the outer diameter side of the pitch circle PC.

  The retaining portion 12 extends from the outer diameter end of each separation portion 11 b of the side surface portion 11 to the other end side in the axial direction. Each retaining portion 12 is located on the outer diameter side of the pitch circle PC. In the state where the cylindrical rollers 3 are accommodated in the pockets 10a as shown in FIG. 1, the retaining portions 12 are positioned between the adjacent cylindrical rollers 3. The retaining portion 12 may be positioned on the inner diameter side of the inner diameter surface of the collar 5b of the outer diameter side member 5, or may be positioned on the outer diameter side. The length of the retaining portion 12 is such that its tip is located on the side where the flange 5b is present from the axial center A of the cylindrical roller 3. Thereby, it is controlled that cylindrical roller 3 slips out to the outside diameter side.

  As shown in FIG. 6 which is a VI-VI sectional view of FIG. 4, when the thickness of the roller holding portion 10 is a, the thickness of the side surface portion 11 is b, and the thickness of the retaining portion 12 is c, The relationship> b> c holds. That is, the thickness gradually decreases in the order of the roller holding portion 10, the side surface portion 11, and the retaining portion 12. This is due to the following reason.

  That is, in this cylindrical roller bearing 1, since the roller holding portion 10 is located on the inner diameter side of the pitch circle PC, the cage 4 serves as an inner ring guide, and the load acting on the cage 4 during operation is the roller holding portion 10. I can receive it. For this reason, the roller holding part 10 requires a large load resistance. The side part 11 is required to have enough strength to support the retaining part 12. The retaining portion 12 is only required to have a function of preventing the cylindrical roller from dropping off to the outer diameter side during assembly or the like, and is not required to have strength. That is, the magnitude of the load acting on each part of the cage 4 decreases in the order of the roller holding part 10, the side part 11, and the retaining part 12. Therefore, the thickness of the roller holding portion 10, the side surface portion 11, and the retaining portion 12 of the cage 4 is reduced in the above order according to the required load resistance.

  Further, when the side surface portion 11 and the retaining portion 12 are thin, the side surface portion 11 and the retaining portion 12 described later can be bent with a relatively small force, so that the bending processing can be performed easily and accurately. It can be carried out.

Next, an example of a method for manufacturing the cage 4 will be described with reference to FIGS.
In the first process, as shown in FIG. 7A, a plate material as a material is formed into a cylindrical shape. FIG. 7A shows a part of a cross section obtained by cutting a mid-processed product 20 formed into a cylindrical shape by a plane passing through a center line (not shown). The same applies to FIGS. 7 (B) to (D) and FIGS. 11 (A) to (C). The plate material used as the material is, for example, a steel plate. The steel plate is preferably made of a steel material having a small amount of carbon (0.3% or less).

  As a method of forming the plate material into a cylindrical shape, for example, a method of forming an annular plate material into a cylindrical shape by deep drawing is employed. Or you may employ | adopt the method of rounding a rectangular board | plate material to cylindrical shape and joining the butt | matching part of the rounded board | plate material by welding. However, in the case of a bearing retainer that is used for a long time (for example, 20 years) without maintenance, such as a gearbox of a wind power generator, it is desirable that the quality is stable if it is formed integrally by deep drawing. .

  In the second process, as shown in FIG. 7B, stepping is performed on the outer peripheral surface on one end side of the cylindrically processed intermediate product 20 by cutting with a lathe. That is, the thickness of the other end portion 20a remains the same, the intermediate portion 20b on one end side is thinner than the other end side portion 20a, and the end portion 20c on one end side is thinner than the intermediate portion 20b. make it thin. In the state completed as the cage 4 (see FIGS. 3 and 5), the other end side portion 20 a becomes the roller holding portion 10, the intermediate portion 20 b becomes the side surface portion 11, and the end portion 20 c becomes the retaining portion 12.

  In the third process, as shown in FIG. 8, a plurality of pockets 10a arranged in the circumferential direction on the other end side portion 20a of the halfway product 20 is processed by laser processing. Since the steel material is low in carbon content, laser processing does not cause burning. The same applies to the case of a fifth process described later. In the state completed as the cage 4 (see FIGS. 3 and 5), the axially opposite side portions of the pocket 10a at the other end side portion 20a of the halfway product 20 become the annular portions 10b and 10c of the roller holding portion 10, and the pocket A portion between 10 a becomes a column portion 10 d of the roller holding portion 10. FIG. 8 is a diagram showing the processed intermediate product 20 developed.

  In the fourth process, as shown in FIGS. 7C and 7D, the intermediate portion 20b and the end portion 20c are removed along the boundary line between the other end side portion 20a and the intermediate portion 20b of the workpiece 20 being processed. Expand to the radial side and mold into a collar. As shown in FIG. 9, this forming is performed step by step by spatula drawing. Specifically, the process is performed by pressing the roller R against the rotated workpiece 20 being processed. The order of the third process and the fourth process may be reversed.

  In the fifth process, as shown in FIG. 10, a plurality of notches 21 that extend in the radial direction and open at the outer diameter ends are processed by laser processing in the collar-shaped intermediate portion 20b and end portion 20c. In the case of this manufacturing method, the bottom of the depth of the notch 21 is positioned substantially at the center between the inner diameter end and the outer diameter end of the intermediate portion 20b. By processing the plurality of notches 21 in this way, a plurality of strip-like portions 22 extending in the radial direction are formed between the notches 21.

  In the sixth process, as shown in FIG. 11A, the end 20c of the band-like portion 22 is bent toward the other end in the axial direction. The bending angle of the end 20c is set so as not to obstruct the operation of housing the cylindrical roller 3 in the pocket 10a in the next process (seventh process). Thereby, the halfway product 20 becomes the semi-finished cage 4A.

  In the seventh process, as shown in FIG. 11 (B), a semi-finished cage 4A is fitted on the outer periphery of the inner ring 2, and each pocket 10a (not shown) of this semi-finished cage 4A is placed on the outer diameter side. The cylindrical roller 3 is accommodated.

  In the eighth process, as shown in FIG. 11C, the end 20c of the semi-finished cage 4A is bent toward the other end in the axial direction so as to be parallel to the axial direction to form the retaining portion 12. Thereby, the cage 4 is completed and the cylindrical roller bearing 1 is assembled. The other end side portion 20a of the semi-completed cage 4A becomes the roller holding portion 10 of the completed cage 4 and the intermediate portion 20b of the semi-completed cage 4A becomes the side surface portion 11 of the completed cage 4.

  According to this cage manufacturing method, in the fourth step, the spatula drawing process is used for the process of expanding the intermediate part 20b and the end part 20c of the intermediate part 20 to the outer diameter side and forming it into a collar shape. This eliminates the need for a mold, and the design of the cage 4 can be changed without a special manufacturing jig unless the design is greatly changed. In addition, since no mold is required, cost can be reduced. In particular, it is advantageous when the cage 4 is produced in a small quantity as in the case of a cylindrical roller bearing used in a speed increaser of a wind power generator.

  Further, in the third process, the pocket 10a is formed in the other end side portion 20a of the intermediate product 20 and in the fifth process, a plurality of notches 21 are formed in the intermediate portion 20b and the end portion 20c of the intermediate product 20. Laser processing is used for processing to be formed. Thereby, the shape of the pocket 10a and the retaining part 12 can be processed freely and easily. Although the cage can be manufactured by shaving, the amount of shaving is large and both material cost and processing cost are high.

  The cylindrical roller bearing 1 includes an inner ring 2, a cylindrical roller 3, and a cage 4, and does not have an independent outer ring as a bearing part. Therefore, the outer diameter of the cylindrical roller bearing 1 is smaller than that of a cylindrical roller bearing having an outer ring. For this reason, the outer diameter side member 5 (refer FIG. 1) in which the cylindrical roller bearing 1 is incorporated can be reduced in size. Further, since the roller holding portion 10 of the cage 4 is positioned on the inner diameter side with respect to the pitch circle PC of the arrangement of the cylindrical rollers 3, the distance between the rollers is narrower than when the roller holding portion 10 is positioned on the pitch circle PC. Thus, the number of rollers can be increased. Thereby, bearing size can be made small, maintaining load capacity.

  As described above, the retaining portion 12 of the retainer 4 is required only to have a function of preventing the cylindrical roller from dropping off to the outer diameter side during assembling or the like, and does not require strength. For this reason, even if the retaining portion 12 has a cantilever support shape that is connected to one end of the roller holding portion 10 via the side surface portion 11, there is no problem in strength. The retaining portion 12 extends from the side of the outer diameter side member 5 where the collar 5b is located to the side where the collar 5b is located, so that it does not interfere with the collar 5b regardless of the inner diameter of the collar 5b. Can be arranged.

  Further, as described above, in the cylindrical roller bearing 1, the thickness of each part of the cage 4 is gradually reduced in the order of the roller holding part 10, the side face part 11, and the retaining part 12. Thus, by making the thickness of the cage 4 taper as described above, the side surface portion 11 and the retaining portion 12 can be bent with a relatively small force, and the bending processing can be easily performed. It can be performed with high accuracy. In particular, as in the manufacturing method shown in FIGS. 7 to 11, when the side surface portion 11 and the retaining portion 12 are bent after stepping the outer peripheral surface of the halfway processed product 20, it is even easier and more accurate. Can be processed.

  In the retainer 4 of this embodiment, the distal end of the retaining portion 12 is located on the side where the collar 5b of the outer diameter side member 5 is located with respect to the axial center A of the cylindrical roller 3. For this reason, it can prevent reliably that the cylindrical roller 3 falls off to the outer-diameter side.

  Furthermore, in the cage 4 of this embodiment, the side surface portion 11 is radially outward from the circumferential position of the annular portion 11a connected to the roller holding portion 10 and the column portion 10d in the annular portion 11a. And a plurality of separation portions 11b extending in the direction. Thereby, compared with the case where the whole side part 11 is made into an annular shape, waste of material can be omitted and the weight of the cage 4 can be reduced.

  In the cage 4 shown in FIGS. 1 to 6, the side surface portion 11 has an annular portion 11a for improving the strength. However, if there is no problem in strength, as shown in FIG. 3 (B)), and the separating portion 11b may extend directly from one axial end of the roller holding portion 10 to the outer diameter side. In that case, the weight of the cage 4 can be further reduced.

  Further, as shown in FIG. 13, the retainer 10 has an annular side surface portion 11 as a whole, and the retaining portion 12 is locally disposed in the axial direction from the outer diameter end of the annular side surface portion 11. The form extended to an end side may be sufficient.

  14 and 15 show different methods of manufacturing the cage. In the manufacturing method of FIGS. 7 to 11, the roller holding portion 10, the side surface portion 11, and the retaining portion 12 are formed when the cage 4 is completed by stepping the outer peripheral surface of the cylindrical intermediate product 20. The thickness is made thinner in the order of. On the other hand, in the manufacturing method shown in FIGS. 14 and 15, in the first process, as shown in FIG. Perform the process.

That is, in the second process, the plurality of pockets 10a are processed in the intermediate product 20 by laser processing (see FIG. 8). Next, in the third process, as shown in FIGS. 14B and 14C, the one end side portion 20d in the axial direction of the cylindrical intermediate processed product 20 is widened to the outer diameter side by spatula drawing. Molded into a collar. The order of the second process and the third process may be reversed. The one end side portion 20d in the axial direction is a portion that becomes the side surface portion 11 and the retaining portion 12 when the cage 4 is completed (see FIGS. 3 and 5). Prior to the spatula drawing process, if an annular groove (not shown) is formed by a lathe or the like at the boundary between the other end side part 20a and the one end side part 20d, molding by the spatula drawing process is facilitated. It can be carried out.
The following process is the same as the manufacturing method of FIGS. The processes in FIGS. 15A, 15B, and 15C correspond to the processes in FIGS. 11A, 11B, and 11C, respectively.

  As described above, when the one end side portion 20d in the axial direction of the cylindrical intermediate processed product 20 is formed into a collar shape by spatula drawing, the end portion 20d is stretched when spreading toward the outer diameter side, so that it becomes a collar shape. The thickness of the one end side portion 20d is thinner than that of the other end side portion 20a. For this reason, the thickness of the side surface part 11 and the retaining part 12 can be made thinner than the roller holding part 10 in the state completed as the cage 4 (see FIGS. 3 and 5).

  Although each said embodiment shows the cylindrical roller bearing 1 in which the cylindrical roller 3 is a single row, this invention is applicable also to the double row cylindrical roller bearing in which the cylindrical roller 3 arranges 2 rows or 3 rows or more.

Next, a description will be given of a step-up gear for a wind turbine generator using the cylindrical roller bearing 1 shown in FIG.
As shown in FIG. 16, the step-up gear 30 of the wind power generator increases the rotation of the input shaft 31 and transmits it to the low-speed shaft 32, and the rotation of the low-speed shaft 32 increases the output. And a secondary speed increasing device 35 that transmits to the shaft 34. The input shaft 31 is connected to the main shaft of the windmill, and the output shaft 34 is connected to the generator.

  As shown in FIGS. 16 and 17, the planetary gear device 33 is provided with support shafts 38 at a plurality of locations in the circumferential direction of the rotatable carrier 37, and the planetary gears 39 of the support shafts 38 are interposed via the cylindrical roller bearings 1. It is supported rotatably. The planetary gear 39 is the outer diameter side member 5 in FIG. The carrier 37 is provided so as to rotate integrally with the input shaft 31 and is rotatably supported by the casing 43 via bearings 41 and 42 (FIG. 16). Each planetary gear 39 supported by the carrier 37 meshes with an internal ring gear 44 provided in the casing 43 and meshes with an external sun gear 45 provided concentrically with the ring gear 44. The sun gear 45 is provided on the low speed shaft 32. The low speed shaft 32 is rotatably supported by the casing 43 through bearings 47 and 48 (FIG. 16).

  As shown in FIG. 16, the secondary speed increasing device 35 is constituted by a gear train. In the example of FIG. 16, in the secondary speed increasing device 35, the gear 50 fixed to the low speed shaft 32 meshes with the small diameter side gear 52 of the intermediate shaft 51, and the large diameter side gear 53 provided on the intermediate shaft 51 is the output shaft. The gear train meshes with the 34 gears 54. The intermediate shaft 51 and the output shaft 34 are rotatably supported by the casing 43 by bearings 55 and 56 and bearings 57 and 58, respectively.

  The operation of the speed increaser 30 configured as described above will be described. When the input shaft 31 rotates, the carrier 37 integral with the input shaft 31 rotates, and the planetary gears 39 supported at a plurality of locations of the carrier 37 revolve. At this time, the planetary gear 39 revolves while revolving while meshing with the fixed ring gear 44 to cause rotation. The sun gear 45 that meshes with the planetary gear 39 that rotates while revolving rotates at an increased speed relative to the input shaft 31. The rotation of the sun gear 45 is accelerated by the secondary speed increasing device 35 and transmitted to the output shaft 34.

  Although the example which uses the cylindrical roller bearing 1 for the step-up gear 30 of a wind power generator was shown in the above description, this cylindrical roller bearing 1 can be used also for another machine. In that case, the outer diameter side member 5 is a rotating member or a non-rotating member other than the planetary gear 39.

  As mentioned above, although the form for implementing this invention based on embodiment was demonstrated, embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 ... Cylindrical roller bearing 2 ... Inner ring 2a ... Inner ring raceway surface 3 ... Cylindrical roller 4 ... Cage 5 ... Outer diameter side member 5a ... Outer diameter side raceway surface 5b ... Collar 10 ... Roller holding part 10a ... Pocket 11 ... Side part 11a ... separation part 12 ... retaining part 20 ... half-finished product 21 ... notch 22 ... band-like part PC ... pitch circle PCD ... pitch circle diameter

Claims (5)

In an outer diameter side member comprising an inner ring, a plurality of cylindrical rollers and a cage, an outer diameter side raceway surface formed on an inner peripheral surface, and having a flange protruding from one axial side of the outer diameter side raceway surface to the inner diameter side A cylindrical roller bearing incorporated in the outer diameter side member so that the cylindrical roller rolls on the outer diameter side raceway surface and an axial position of the cylindrical roller is regulated by the collar of the outer diameter side member. In
The retainer is positioned on the inner diameter side of the pitch circle of the arrangement of the cylindrical rollers, and has a cylindrical roller holding portion in which a plurality of pockets for receiving the cylindrical rollers are formed, and the outer diameter of the roller holding portion. A side surface portion extending from the axial end opposite to the flange side of the side member to the outer diameter side, and an axial direction from the position on the outer diameter side of the pitch circle in the side surface portion to the side with the flange A cylindrical roller bearing comprising: a plurality of retaining portions that are positioned between the adjacent cylindrical rollers extending to the outside and that prevent the cylindrical rollers from dropping off to the outer diameter side.   2. The cylindrical roller bearing according to claim 1, wherein the retaining portion of the retainer has a distal end located on a side where the collar is located with respect to an axial center of the cylindrical roller.   3. The cylindrical roller bearing according to claim 1, wherein the side surface portion of the cage is located in the same phase in the circumferential direction between the pockets and extends to the outer diameter side in a state where they are separated from each other. A cylindrical roller bearing having a plurality of separating portions.   The cylindrical roller bearing according to any one of claims 1 to 3, wherein the cage is a cylindrical roller in which the thickness of each of the side surface portion and the retaining portion is smaller than the thickness of the roller holding portion. bearing. A cylindrical roller holder having a plurality of pockets arranged in the circumferential direction, a side surface extending from one axial end of the roller holder to the outer diameter side, and the pocket at the outer diameter end of the side surface A retainer portion extending from the circumferential position of the portion to the other end side in the axial direction, and a method of manufacturing a cage in which cylindrical rollers are respectively accommodated in the plurality of pockets,
The process of forming the material plate into a cylindrical shape,
A process of processing the pocket by laser processing at a predetermined position of a portion to be the roller holding portion of the cage located in the axial central portion of the mid-processed product formed in a cylindrical shape,
A process of forming the side part on the one end side in the axial direction of the halfway product and the part to be the retaining part to the outer diameter side by spatula drawing and forming into a collar shape,
In the circumferential direction range of the pocket in the collar-shaped portion, a process of machining a plurality of notches that extend in the radial direction by laser processing and have outer diameter ends opened;
Bending the portion of the belt-like portion between the notches to be the retaining portion of the cage to the other end in the axial direction at an angle that does not hinder the operation of housing the cylindrical roller in the pocket; ,
After the cylindrical roller is accommodated in the pocket, a step of bending the portion that serves as the retaining portion of the cage to the other end side in the axial direction so as to be parallel to the axial direction to form the retaining portion. A method for manufacturing a cage.

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