JP5534804B2 - Cage manufacturing method, cage, and needle roller bearing - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a cage manufacturing method, a cage, and a needle roller bearing, and more particularly to a cage manufacturing method, cage, and needle roller bearing manufactured by press working. is there.

  For example, Japanese Patent Application Laid-Open No. 3-169442 discloses a technique relating to a manufacturing method of a so-called V-type or M-type cage in which the cross section when the cage is cut along the rotation axis is substantially V-shaped or M-shaped. (Patent Document 1), JP-A 2000-337338 (Patent Document 2), JP-A 2006-7246 (Patent Document 3), JP-A 2000-257638 (Patent Document 4), JP-A 2009-156389. (Patent Document 5) and JP 2007-40336 (Patent Document 6).

  In the cage manufacturing method disclosed in Patent Literature 1 and Patent Literature 2, first, a plurality of pockets are formed by punching a cylindrical cage member. After that, the diameter of the central portion in the axial direction of the cage member is reduced so that the cross section is substantially M-shaped.

  However, in the manufacturing methods of Patent Document 1 and Patent Document 2, since the cross section is formed in a substantially M shape after a plurality of pockets are formed, the pocket dimensions are determined after the pocket formation and after the formation of the substantially M cross section. It will be different. If it does so, it is necessary to manage a pocket dimension elaborately, and such an operation | work is complicated.

  Therefore, in the method for manufacturing a cage disclosed in Patent Literature 3 and Patent Literature 4, first, a cylindrical cage member is subjected to bulging so that the cross-section becomes substantially M-shaped. The diameter of both ends of the cage member in the axial direction is increased. Thereafter, a plurality of pockets are formed.

  However, in the manufacturing methods of Patent Document 3 and Patent Document 4, an elastic body or an incompressible fluid is used when bulging is performed. The life of such a member is shortened because it expands and contracts during processing. If it does so, the production efficiency of a cage will worsen.

  Therefore, in the method for manufacturing a cage disclosed in Patent Document 5, the shaft of the cage member is shaped so that the cross-section becomes substantially V-shaped by pressing the cylindrical cage member. Both end portions in the direction are expanded.

  FIG. 15 is a diagram illustrating a method for manufacturing a cage disclosed in Patent Document 5. In addition, let the up-down direction of the paper surface of FIG. 15 be the up-down direction of a jig. Referring to FIG. 15, when manufacturing the cage, outer mold 101 and inner molds 102 and 103 are used. The outer mold 101 includes a small-diameter portion 101a located at the axial center portion, a large-diameter portion 101b located at both axial end portions, and an inclined portion 101c located between the small-diameter portion 101a and the large-diameter portion 101b. is there. The inner molds 102 and 103 are configured to include a first inner mold 102 located on the upper side, that is, one axial direction, and a second inner mold 103 located on the lower side, that is, the other axial side. is there. And small diameter part 102a, 103a located in the axial direction center side, large diameter part 102b, 103b located in an axial direction both ends, and the inclined part located between small diameter part 102a, 103a and large diameter part 102b, 103b 102c and 103c.

  When manufacturing the cage, first, a cylindrical cage member 100 is prepared, and the outer diameter surface of the cage member 100 is constrained by the small diameter portion 101 a of the outer mold 101. Then, the first and second inner molds 102 and 103 are simultaneously pushed in the axial direction from both axial sides of the cage member 100 to simultaneously expand the diameters of both axial ends of the cage member 100.

Japanese Patent Laid-Open No. 3-169442 JP 2000-337338 A JP 2006-7246 A JP 2000-257638 A JP 2009-156389 A JP 2007-40336 A

  In the cage manufacturing method disclosed in Patent Document 5, the first and second inner molds 102 and 103 are pushed forward from both sides in the axial direction of the cage member 100 at the same timing. However, since the cage member 100 has a cylindrical shape, there is no reference in the axial direction when the first and second inner molds 102 and 103 are pushed forward. Then, accurate positioning in the axial direction when the first and second inner molds 102 and 103 are pushed forward cannot be performed, and for example, it becomes difficult to form a cage having a symmetrical shape in the vertical direction. End up. That is, the region to be expanded in diameter is different between the opening on one axial side that is the upper side and the opening on the other axial side that is the lower side. As a result, it becomes difficult to obtain a cage having a desired shape.

  Further, in the cage manufacturing method disclosed in Patent Document 6, a step on one axial side is formed by deep drawing, and a step on the other axial side is formed by expanding the diameter. Then, on the other side in the axial direction where the diameter has been expanded, there may be a portion where the radial width, that is, the wall thickness is not sufficient as compared to the one side in the deeply drawn axial direction. As a result, it becomes difficult to obtain a cage having a desired shape.

  The objective of this invention is providing the manufacturing method of the holder | retainer which can manufacture the holder | retainer of a desired shape easily.

  Another object of the present invention is to provide a cage having a desired shape that can be easily manufactured.

  Still another object of the present invention is to provide a needle roller bearing of a desired shape that can be easily manufactured.

  The method for manufacturing a cage according to the present invention is a method for manufacturing a cage having a substantially V-shaped cross section, which is a base of the cage, has a predetermined thickness, and has a relatively small diameter on one side of the opening. A stepped cylindrical cylindrical member having a step having a small diameter portion, a large diameter portion having a relatively large diameter on the other side of the opening, and a step portion extending in the radial direction so as to connect the small diameter portion and the large diameter portion. The area on the opening side of the small-diameter portion with the stepped portion as the reference in the central axis direction of the stepped cylindrical member while the diameter of the region on the large-diameter portion side of the small-diameter portion is the same diameter A diameter expanding step for expanding the diameter so as to be the same as the diameter of the large diameter portion, and a pressing step for pressing the region on the opening side and the region on the small diameter portion in the expanded diameter region in the axial direction. .

  The manufacturing method of such a retainer is a stepped cylindrical member having a small diameter portion, a large diameter portion, and a stepped portion, and a region on the opening side of the small diameter portion, The diameter is expanded to be the same as the diameter of the large diameter portion. Therefore, when the diameter of the area on the opening side is increased, the diameter can be increased on the basis of the stepped portion. That is, the positioning in the axial direction when expanding the diameter of the opening side region can be easily performed using the stepped portion. Further, in order to press the area on the opening side and the area on the small diameter part side of the expanded diameter area in the axial direction, the thickness can be finely adjusted in the area where the thickness is not sufficient when the diameter is expanded. it can. As a result, a cage having a desired shape can be easily manufactured.

  As one embodiment, the preparation step includes a cup-shaped member preparation step of preparing a cup-shaped member having a cylindrical portion that extends straight in the axial direction and a bottom portion that covers one end of the cylindrical portion. This is a step of preparing a stepped cylindrical member by projecting the central portion in the radial direction to a side different from the side on which the cylindrical portion is located, using the projected portion as the small diameter portion and the cylindrical portion as the large diameter portion. By doing so, a stepped cylindrical member can be prepared with a simple configuration.

  As another embodiment, the preparation step includes a cylindrical member preparation step that prepares a cylindrical member that extends straight in the axial direction and has the same diameter as the small-diameter portion, and expands a region on one side of the opening of the cylindrical member. This is a step of preparing a stepped cylindrical member with a large diameter portion and a region on the other side of the opening of the cylindrical member as a small diameter portion.

  More preferably, after the diameter expanding step, a flange forming step of forming a flange by bending both axial ends of the member toward the inner diameter side is included. By doing so, an M-shaped cage can be manufactured.

  More preferably, it includes a pocket forming step of forming a plurality of pockets so as to open predetermined portions of the member after the pressing step. By doing so, the pocket size management can be reduced.

  Another aspect of the present invention relates to a cage having a substantially V-shaped cross section. The cage is a base of the cage, has a predetermined thickness, a small diameter portion having a relatively small diameter on one side of the opening, a large diameter portion having a relatively large diameter on the other side of the opening, a small diameter portion, and While preparing a stepped cylindrical stepped cylindrical member having a stepped portion extending in the radial direction so as to connect the large diameter portion, while making the diameter of the region on the large diameter portion side of the small diameter portion the same diameter, Using the stepped portion as a reference in the central axis direction of the stepped cylindrical member, the region on the opening side of the small-diameter portion is expanded to be the same as the diameter of the large-diameter portion, and the opening in the expanded region The region on the side and the region on the small diameter part side are pressed in the axial direction.

  Such a retainer has a small diameter portion, a large diameter portion, and a stepped cylindrical member having a stepped cylindrical portion. The diameter is expanded to be the same as the diameter. Therefore, when the diameter of the area on the opening side is increased, the diameter can be increased on the basis of the stepped portion. That is, the positioning in the axial direction when expanding the diameter of the opening side region can be easily performed using the stepped portion. Further, in order to press the area on the opening side and the area on the small diameter part side of the expanded diameter area in the axial direction, the thickness can be finely adjusted in the area where the thickness is not sufficient when the diameter is expanded. it can. As a result, a cage having a desired shape can be easily obtained.

  In still another aspect of the present invention, the present invention relates to a needle roller bearing including a plurality of needle rollers and a cage having a plurality of pockets for accommodating the plurality of needle rollers and having a substantially V-shaped cross section. The cage is a base of the cage, has a predetermined thickness, a small diameter portion having a relatively small diameter on one side of the opening, a large diameter portion having a relatively large diameter on the other side of the opening, a small diameter portion, and While preparing a stepped cylindrical stepped cylindrical member having a stepped portion extending in the radial direction so as to connect the large diameter portion, while making the diameter of the region on the large diameter portion side of the small diameter portion the same diameter, Using the stepped portion as a reference in the central axis direction of the stepped cylindrical member, the region on the opening side of the small-diameter portion is expanded to be the same as the diameter of the large-diameter portion, and the opening in the expanded region A plurality of pockets for accommodating a plurality of needle rollers are formed by pressing the region on the side and the region on the small diameter portion side in the axial direction so as to open predetermined portions of the member.

  Such a needle roller bearing is provided on the opening side of the small diameter portion with respect to a stepped cylindrical member having a small diameter portion, a large diameter portion, and a step portion. The area is expanded so as to be the same as the diameter of the large diameter portion. Therefore, when the diameter of the area on the opening side is increased, the diameter can be increased on the basis of the stepped portion. That is, the positioning in the axial direction when expanding the diameter of the opening side region can be easily performed using the stepped portion. Further, in order to press the area on the opening side and the area on the small diameter part side of the expanded diameter area in the axial direction, the thickness can be finely adjusted in the area where the thickness is not sufficient when the diameter is expanded. it can. As a result, a needle roller bearing having a desired shape can be easily obtained.

  The method for manufacturing a cage according to the present invention provides a stepped cylindrical member having a small diameter portion, a large diameter portion, and a step portion, and has a region on the opening side of the small diameter portion. The diameter is increased to be the same as the diameter of the large diameter portion. Therefore, when the diameter of the area on the opening side is increased, the diameter can be increased on the basis of the stepped portion. That is, the positioning in the axial direction when expanding the diameter of the opening side region can be easily performed using the stepped portion. Further, in order to press the area on the opening side and the area on the small diameter part side of the expanded diameter area in the axial direction, the thickness can be finely adjusted in the area where the thickness is not sufficient when the diameter is expanded. it can. As a result, a cage having a desired shape can be easily manufactured.

  Further, the cage according to the present invention is a stepped cylindrical member having a small diameter portion, a large diameter portion, and a stepped portion, the opening side region of the small diameter portion, The diameter is expanded to be the same as the diameter of the large diameter portion. Therefore, when the diameter of the area on the opening side is increased, the diameter can be increased on the basis of the stepped portion. That is, the positioning in the axial direction when expanding the diameter of the opening side region can be easily performed using the stepped portion. Further, in order to press the area on the opening side and the area on the small diameter part side of the expanded diameter area in the axial direction, the thickness can be finely adjusted in the area where the thickness is not sufficient when the diameter is expanded. it can. As a result, a cage having a desired shape can be easily obtained.

  In addition, the needle roller bearing according to the present invention is a cage in which a stepped cylindrical member having a small diameter portion, a large diameter portion, and a step portion has a small diameter portion. The area on the opening side is expanded so as to be the same as the diameter of the large diameter part. Therefore, when the diameter of the area on the opening side is increased, the diameter can be increased on the basis of the stepped portion. That is, the positioning in the axial direction when expanding the diameter of the opening side region can be easily performed using the stepped portion. Further, in order to press the area on the opening side and the area on the small diameter part side of the expanded diameter area in the axial direction, the thickness can be finely adjusted in the area where the thickness is not sufficient when the diameter is expanded. it can. As a result, a needle roller bearing having a desired shape can be easily obtained.

It is the figure which looked at a part of section containing a rotation axis at the time of cutting a maintenance machine concerning one embodiment of this invention along a rotation axis from the inner diameter side. It is a flowchart which shows the main manufacturing processes of a holder | retainer. It is a figure which shows a cup-shaped member. It is a figure which shows the detail at the time of forming a stepped cylindrical member from a cup-shaped member. It is a figure which shows the case where a punch is moved to the axial direction upper side. It is a figure which shows a stepped cylindrical member. It is a figure which shows a diameter expansion jig. It is the figure which looked at the dice | dies shown in FIG. 7 from the direction of arrow VIII in FIG. It is a figure which shows the dice which moved to radial direction. It is a figure which shows the case where the outer peripheral surface of a stepped cylindrical member is restrained with dice | dies. It is a figure which shows the case where the lower side surface of an enlarged diameter part contact | abuts the upper side surface of a support part, and the cage member is formed. It is a figure which shows the case where a pressing process is performed with respect to a cage member. It is the figure which expanded and showed the part enclosed by XIII in FIG. It is a figure which shows a M-type holder | retainer. It is a figure shown about the manufacturing method of the holder | retainer currently disclosed by patent document 5. FIG.

  A cage according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a view of a part of a cross section including a rotation axis when the retainer 11 according to an embodiment of the present invention is cut along the rotation axis viewed from the inner diameter side.

  Referring to FIG. 1, the retainer 11 includes a pair of annular portions 12 a and 12 b located at both axial ends, and a plurality of column portions 13 that connect the pair of annular portions 12 a and 12 b and extend in the axial direction. Prepare.

  The column portion 13 has a shape extending in the axial direction. The column portion 13 is positioned relatively on the inner diameter side, the column center portion 18 positioned at the axial center portion, a pair of column inclined portions 17a and 17b extending inclined from both axial end portions of the column center portion 18, and A pair of column end portions 16a and 16b that are positioned relatively on the outer diameter side and extend in the axial direction from the pair of column inclined portions 17a and 17b are provided. That is, the retainer 11 is a so-called V-shaped retainer having a substantially V-shaped cross section when cut along the rotation axis. A pocket 14 is provided between the adjacent pillars 13 to accommodate the rollers. A plurality of pockets 14 are provided at intervals in the circumferential direction.

  Here, the manufacturing method of the above cage 11 will be described. FIG. 2 is a flowchart showing main manufacturing steps of the cage 11.

  First, for example, a cup-shaped cup-shaped member is formed by drawing a flat plate such as a circular plate (S11). FIG. 3 is a view showing the cup-shaped member 20. With reference to FIG. 3, the cup-shaped member 20 has a configuration including a cylindrical cylindrical portion 20b that extends straight in the axial direction and a bottom portion 20a that covers one axial end of the cylindrical portion 20b. The step S11 is a cup-shaped member preparation step for preparing the cup-shaped member 20.

  Next, a stepped cylindrical member 21 is formed by subjecting the cup-shaped member 20 to a stepped drawing process (S12). FIG. 4 is a diagram showing details when the stepped cylindrical member 21 is formed from the cup-shaped member 20. Referring to FIG. 4, when performing stepped drawing, a drawing jig 25 is prepared. The drawing jig 25 includes a punch 30 and a pressing portion 32. A punch 30 is disposed inside the cup-shaped member 20, and a pressing portion 32 is disposed outside the cup-shaped member 20. In addition, let the up-down direction of the paper surface of FIG. 4 be the up-down direction of a jig.

  The punch 30 is movable in the axial direction, that is, the vertical direction, and has a cylindrical shape extending in the axial direction. The punch 30 is located on the lower side in the axial direction, and has a large diameter punch portion 30a having the same diameter as the inner circumference of the cup-shaped member 20, and is located on the upper side in the axial direction and smaller in diameter than the large diameter punch portion 30a. A small-diameter punch portion 30c, and an inclined punch portion 30b that connects the large-diameter punch portion 30a and the small-diameter punch portion 30c with an inclination are provided. Although not shown, the inclined punch portion 30b is provided with a groove capable of discharging oil when the punch 30 is moved. The punch 30 is disposed so that the small-diameter punch portion 30 c side is on the bottom portion 20 b side of the cup-shaped member 20.

  The pressing portion 32 is in a fixed state and has a cylindrical shape extending in the axial direction. A wall surface 31 on the inner diameter side of the pressing portion 32 is positioned on the lower side in the axial direction, and has a large diameter pressing portion 32a having the same diameter as the outer diameter of the cup-shaped member 20, and a large diameter pressing portion positioned on the upper side in the axial direction. A small-diameter pressing portion 32c having a smaller diameter than the portion 32a, and an inclined pressing portion 32b that connects the large-diameter pressing portion 32a and the small-diameter pressing portion 32c with an inclination are provided. Although not shown, the inclined pressing portion 32b is provided with a groove capable of discharging oil, like the inclined punch portion 30b of the punch 30. The pressing portion 32 is disposed so that the large diameter pressing portion 32 a side is on the bottom portion 20 b side of the cup-shaped member 20.

  Then, as shown in FIG. 5, when the punch 30 is moved upward in the axial direction, the outer diameter side of the bottom portion 20a is fixed by the inclined pressing portion 32b of the pressing portion 32, and the radial center portion of the bottom portion 20a is fixed to the punch 20 30 is pushed upward in the axial direction, that is, a side different from the cylindrical portion 20b. Then, the inner diameter side of the bottom portion 20a protrudes upward in the axial direction, and the outer diameter side of the bottom portion 20a retreats downward in the axial direction. Thus, the cup-shaped stepped cylindrical member 21 is formed. FIG. 5 is a diagram illustrating a case where the punch 30 is moved upward in the axial direction.

  The punch 30 and the pressing portion 32 may be split in the axial direction, that is, the vertical direction. For example, the large-diameter punch portion 30a, the inclined punch portion 30b, and the small-diameter punch portion 30c may be divided. By doing so, it can be easily applied to the cup-shaped member 20 having different axial lengths, for example, by simply replacing the large-diameter punch portion 30a with one having a different length.

  And the bottom part 20a is removed (S13) and the cylindrical stepped cylindrical member 21 is formed. FIG. 6 is a view showing the stepped cylindrical member 21. Referring to FIG. 6, the stepped cylindrical member 21 is positioned on one side in the axial direction that is one side of the opening, that is, on the upper side in the axial direction, and on the other side of the opening with the small diameter portion 21 c having a relatively small diameter. A step that is located on the other axial side, that is, on the lower side in the axial direction and that extends in the radial direction so as to connect the relatively large diameter large diameter portion 21a, the small diameter portion 21c, and the large diameter portion 21a in an inclined manner. Part 21b. The stepped cylindrical member 21 is a member that is a base of the cage 11 and has a predetermined thickness. And the process from S11 to S13 is a preparation process for preparing the stepped cylindrical member 21.

  Next, a cage member 22 having a substantially V-shaped cross section is formed by subjecting the stepped cylindrical member 21 to a diameter expansion process as a diameter expansion process (S14). Specifically, first, a diameter expansion jig for performing diameter expansion processing is prepared. FIG. 7 is a view showing the diameter expansion jig 35. With reference to FIG. 7, the diameter expansion jig 35 includes a cam plate 36, a die 37, a support portion 38, a diameter expansion portion 39, and a pressing portion 40. In addition, let the up-down direction of the paper surface of FIG. 7 be the up-down direction of a jig.

  The cam plate 36 is movable in the axial direction, that is, in the vertical direction. When the cam plate 36 moves downward in the axial direction, the die 37 moves to the inner diameter side.

  The die 37 is arranged on the outer diameter side of the stepped cylindrical member 21. FIG. 8 is a view of the dice 37 shown in FIG. 7 as viewed from the axial direction, that is, from the direction of the arrow VIII in FIG. Referring to FIGS. 7 and 8, the die 37 includes a first divided die 37a, a second divided die 37b, a third divided die 37c, and a fourth divided die 37d.

  As for the 1st division | segmentation die 37a, the wall surface 42a by the side of an inner diameter is circular. Thereby, when the four divided dies 37a to 37d are combined, the inner wall surfaces 42a to 42d form a circle. Further, the inner wall surface 42a is composed of a protrusion 41b, a retreating part 41a, and an inclined part 41c. The protrusion 41b is located at the axially central portion and has a shape protruding relatively toward the inner diameter side. The receding portions 41a are located at both ends in the axial direction and have a shape that is relatively recessed toward the outer diameter side. The inclined portion 41c connects the protruding portion 41b and the retracted portion 41a with an inclination. The receding portion 41 a located on the lower side in the axial direction has a shape along the outer peripheral surface of the large diameter portion 21 a of the stepped cylindrical member 21. Further, the inclined portion 41 c located on the lower side in the axial direction has a shape along the outer peripheral surface of the stepped portion 21 b of the stepped cylindrical member 21. Further, the protrusion 41 b has a shape along the outer peripheral surface of the small diameter portion 21 c of the stepped cylindrical member 21. Since the second divided die 37b, the third divided die 37c, and the fourth divided die 37d have the same shape, the description thereof is omitted.

  Each of the first to fourth divided dies 37a to 37d is movable to the inner diameter side and the outer diameter side. When the first to fourth divided dies 37a to 37d move toward the inner diameter side, they approach the stepped cylindrical member 21 and support the outer peripheral surface of the stepped cylindrical member 21 with the inner wall surfaces 42a to 42d. . Specifically, the large-diameter portion 21a and the step portion 21b of the stepped cylindrical member 21 are supported by the retreating portion 41a and the inclined portion 41c located on the lower side in the axial direction, and the stepped cylindrical member is supported by the protrusion 41b. A region on the lower side in the axial direction of the small diameter portion 21c of 21 is supported. Moreover, if it moves to the outer diameter side, it will move away from the stepped cylindrical member 21 and will not support the outer peripheral surface of the stepped cylindrical member 21. FIG. 9 shows the state of the die 37 when moving to the inner diameter side and supporting the outer peripheral surface of the stepped cylindrical member 21.

  The support portion 38 is disposed on the inner diameter side of the stepped cylindrical member 21. A large-diameter support portion 38a having a relatively large diameter located on the lower side in the axial direction, a small-diameter support portion 38c having a relatively small diameter located on the upper side in the axial direction, a large-diameter support portion 38a, and It is comprised from the inclination support part 38b which inclines and connects the small diameter support part 38c. And the large diameter support part 38a is a shape in alignment with the internal peripheral surface of the large diameter part 21a of the cylindrical member 21 with a step. The inclined support portion 38b has a shape along the inner peripheral surface of the step portion 21b of the stepped cylindrical member 21. Further, the small diameter support portion 38 c has a shape along the inner peripheral surface of the small diameter portion 21 c of the stepped cylindrical member 21. The support portion 38 is fixed on the inner diameter side of the die 37.

  The enlarged-diameter portion 39 is located on the upper side in the axial direction, a large-diameter enlarged portion 39a having a relatively large diameter, and a small-diameter enlarged portion 39c that is located on the lower side in the axial direction and has a relatively small diameter, The large-diameter enlarged portion 39a and the small-diameter enlarged portion 39c are composed of an inclined enlarged-diameter portion 39b that inclines and continues. The enlarged diameter portion 39 is disposed so as to face the upper direction of the support portion 38 and is movable in the vertical direction. The enlarged diameter portion 39 and the support portion 38 have a line-symmetric shape with a line perpendicular to the rotation axis as the center. That is, it has a shape that is line symmetrical up and down.

  The pressing portion 40 has a cylindrical shape and a radial width of the stepped cylindrical member 21, that is, a width along the thickness of the stepped cylindrical member 21. The pressing portion 40 is disposed on the outer diameter side of the enlarged diameter portion 39 and abuts on the outer peripheral surface of the enlarged diameter portion 39. Moreover, the press part 40 is movable to an up-down direction.

  Here, when performing the diameter expansion process, as shown in FIG. 7, first, the stepped cylindrical member 21 is arranged to be supported by the support portion 38. Specifically, the large diameter portion 21a of the stepped cylindrical member 21 is supported by the large diameter support portion 38a of the support portion 38, and the step portion 21b of the stepped cylindrical member 21 is supported by the inclined support portion 38b of the support portion 38. It supports and arrange | positions so that the area | region of the axial direction lower side of the small diameter part 21c of the stepped cylindrical member 21 may be supported by the small diameter support part 38c of the support part 38.

  Next, the die 37 is moved to the inner diameter side by moving the cam plate 36 downward in the axial direction. Then, the die 37 is in the state shown in FIG. 9 described above and restrains the outer peripheral surface of the stepped cylindrical member 21. FIG. 10 is a diagram illustrating a case where the outer peripheral surface of the stepped cylindrical member 21 is constrained by the die 37. Referring to FIG. 10, specifically, the large-diameter portion 21a and the step portion 21b of the stepped cylindrical member 21 are restrained by the retreating portion 41a and the inclined portion 41c located on the lower side in the axial direction of the die 37. Further, the region on the lower side in the axial direction of the small diameter portion 21 c of the stepped cylindrical member 21 is restrained by the protrusion 41 b of the die 37.

  And the area | region of the axial direction upper side of the small diameter cylindrical part 21c of the stepped cylindrical member 21 is expanded by moving the enlarged diameter part 39 to an axial direction lower side. Specifically, first, the large-diameter portion 39c of the large-diameter portion 39 is guided to the inner peripheral surface of the small-diameter portion 21c of the stepped cylindrical member 21 so that the large-diameter portion 39 is moved downward in the axial direction. Move. If it does so, the diameter of the large diameter part 21a side of the small diameter part 21c of the stepped cylindrical member 21, ie, the diameter of the area | region of an axial lower side, will remain the same diameter, and the diameter expansion of the diameter expansion part 39 will be carried out. The portion 39b is pushed downward in the axial direction, and the small diameter portion 21c of the stepped cylindrical member 21 is expanded in diameter from the tip. Since the stepped portion 21b of the stepped cylindrical member 21 is supported by the support portion 38 and is positioned in the axial direction, the lower side surface of the enlarged diameter portion 39 abuts on the upper side surface of the support portion 38, A large-diameter portion 22a and an inclined portion 22b are formed in a region on the upper side in the axial direction of the small-diameter portion 21c of the attached cylindrical member 21. That is, using the stepped portion 21b as a reference in the central axis direction of the stepped cylindrical member 21, the region on the opening side of the small diameter portion 21c of the stepped cylindrical member 21 is defined as the large diameter portion 21a of the stepped cylindrical member 21. The diameter is expanded to be the same as the diameter. Thereby, the stepped cylindrical member 21 becomes the cage member 22. FIG. 11 is a diagram illustrating a case where the cage member 22 is formed by the lower side surface of the enlarged diameter portion 39 abutting on the upper side surface of the support portion 38. In this way, the diameter expansion process is performed to form the cage member 22.

That is, the cage member 22 is located at the axially central portion, the relatively small diameter small diameter portion 22c, the axially located both ends, the relatively large diameter large diameter portion 22a, and the small diameter It is comprised from the inclination part 22b which inclines and extends the part 21c and the large diameter part 21a. The large diameter portion 21 a of the stepped cylindrical member 21 is a large diameter portion 22 a on the lower side in the axial direction of the cage member 22. The step portion 21 b of the stepped cylindrical member 21 is an inclined portion 22 b on the lower side in the axial direction of the cage member 22. A region on the lower side in the axial direction of the small diameter portion 21 c of the stepped cylindrical member 21 is the small diameter portion 22 c of the cage member 22. A region on the upper side in the axial direction of the small diameter portion 21 c of the stepped cylindrical member 21, that is, a region whose diameter has been increased, is an inclined portion 22 b and a large diameter portion 22 a on the upper side in the axial direction of the cage member 22.

  And a pressing process is performed with respect to the retainer member 22 as a pressing process (S15). FIG. 12 is a diagram showing a case where the retainer member 22 is pressed. Referring to FIG. 12, the expanded region is pressed in the axial direction while the cage member 22 is restrained by the die 37, the support portion 38 and the expanded diameter portion 39. Specifically, the end surface of the large-diameter portion 22a on the upper side in the axial direction of the cage member 22 is pressed in the axial direction by moving the pressing portion 40 downward in the axial direction. The large-diameter portion 22a on the upper side in the axial direction of the cage member 22 is a region on the opening side of the expanded region.

  Further, the inclined portion 22b on the upper side in the axial direction of the cage member 22 is pressed in the axial direction. The inclined portion 22b on the upper side in the axial direction of the cage member 22 is a region on the small diameter portion side of the expanded diameter region. In this case, the pressing portion 40 may be moved downward in the axial direction, or may be pressed in the axial direction using a jig other than the pressing portion 40, for example. The other jigs are, for example, arranged in the same shape and the same position as the enlarged-diameter portion 39 and can move in the vertical direction. Then, the inclined portion 22b on the upper side in the axial direction of the cage member 22 is pressed in the axial direction by moving the lower side in the axial direction.

  Thereby, when the diameter expansion processing is performed, as shown in FIG. 13, the gap between the die 37 and the cage member 22 in the connecting portion 60 that connects the large diameter portion 22 a and the inclined portion 22 b, that is, Even when the sag 61 is formed, the material flow can be promoted and the sag 61 can be suppressed. FIG. 13 is an enlarged view of a portion surrounded by XIII in FIG. Similarly, sagging can be suppressed even when sagging is formed at the portion connecting the small diameter portion 22c and the inclined portion 22b.

  Further, the large diameter portion 22a and the inclined portion 22b on the upper side in the axial direction of the cage member 22 can be satisfied even when the radial thickness is not sufficient. And the thickness of the expanded diameter region of the cage member 22 is the thickness of the large-diameter portion 22a and the step portion 22b on the lower side in the axial direction of the cage member 22 formed by performing stepped drawing. Can be the same. That is, as the pressing process, the large-diameter portion 22a and the inclined portion 22b on one side in the axial direction formed by expanding the diameter, and the large-diameter portion 22a and the inclined portion 22b on the other side in the axial direction formed by performing stepped drawing. You may make it become the same wall thickness.

  Then, a plurality of pockets are formed in the cage member 22 (S16). For example, a plurality of pockets are formed by opening a predetermined portion of the cage member 22 by punching.

  In this way, the cage 11 is manufactured. That is, with respect to the stepped cylindrical member 21 having the small diameter portion 21c, the large diameter portion 21a, and the stepped portion 21b, the region on the opening side of the small diameter portion 21c is defined as the large diameter portion. The diameter is increased to be the same as the diameter of 21a. Therefore, when the diameter of the area on the opening side is increased, the diameter can be increased on the basis of the stepped portion 21b. That is, it is possible to easily perform positioning in the axial direction when the diameter of the opening-side region is expanded using the step portion 21b. Further, in order to press the region on the opening side and the region on the small diameter part 21c side in the expanded diameter region in the axial direction, fine adjustment of the thickness is performed in a region where the thickness is not sufficient when the diameter is expanded. Can do. As a result, the cage 11 having a desired shape can be easily manufactured.

  Moreover, such a retainer 11 has an opening in the small diameter portion 21c with respect to a stepped cylindrical member 21 having a small diameter portion 21c, a large diameter portion 21a, and a stepped portion 21b. The side region is expanded so as to be the same as the diameter of the large diameter portion 21a. Therefore, when the diameter of the area on the opening side is increased, the diameter can be increased on the basis of the stepped portion 21b. That is, it is possible to easily perform positioning in the axial direction when the diameter of the opening-side region is expanded using the step portion 21b. Further, in order to press the area on the opening side and the area on the small diameter part side of the expanded diameter area in the axial direction, the thickness can be finely adjusted in the area where the thickness is not sufficient when the diameter is expanded. it can. As a result, the cage 11 having a desired shape can be easily obtained.

  In addition, in said embodiment, although the enlarged diameter part 39 and the press part 40 demonstrated the example which is a different body, it may be integrated not only in this but. By doing so, it is possible to suppress the increase in the number of the diameter expansion jigs 35 and simplify the control of the jigs during the diameter expansion process.

  Further, when the pressing process is performed, it is disposed on the outer diameter side of the support portion 38 and is held in contact with the outer peripheral surface of the support portion 38 and the end surface of the large end portion 22a on the lower side in the axial direction of the cage member 22. A jig for supporting the vessel member 22 may be provided. By carrying out like this, a pressing process can be performed appropriately and the dimensional accuracy of the thickness of the cage member 22 can be improved.

  In the above-described embodiment, an example in which the thickness of the expanded region is satisfied by pressing is described. However, the present invention is not limited to this, and the stepped cylindrical member 21 is prepared. Similarly, the thickness may be satisfied. For example, as shown in FIG. 5, by repeatedly performing the operation of moving the punch 30 upward in the axial direction a plurality of times, the stepped portion 21b and the small diameter portion 21c of the stepped cylindrical member 21, and the stepped portion 21b and the small diameter Satisfaction of the portion connecting the portion 21c may be achieved.

  In the above-described embodiment, the cage 11 is a V-type cage, and the manufacturing method has been described with respect to the method for manufacturing the V-type cage. It can also be used for a so-called M-shaped cage.

  FIG. 14 is a view showing an M-type cage 51. Referring to FIG. 14, the retainer 51 has a configuration having flanges 52a and 52b. The flange portions 52a and 52b have a shape protruding in the radial direction from the pair of annular portions 53a and 53b. Since the other components are the same as those of the V-shaped cage 11 described above, the description thereof is omitted.

  Further, when manufacturing the M-shaped cage 51, both axial ends of the large-diameter portion 22 a of the cage member 22 are set to the inner diameter side after the diameter expansion processing in S 14 of FIG. 2 or the pressing processing in S 15. The flanges 52a and 52b may be formed by bending.

  In the above-described embodiment, the example in which the die 37 is configured by the first to fourth four divided dies 37a to 37d has been described. However, the present invention is not limited thereto, and two or more divided dies can be used. It may be configured.

  In the above embodiment, an example of forming the stepped cylindrical member 21 by performing stepped drawing has been described. However, the present invention is not limited to this, and the above-described diameter expanding jig 35 is used. The stepped cylindrical member 21 may be formed. That is, the preparation step includes a cylindrical member preparation step that extends straight in the axial direction and prepares a cylindrical member having the same diameter as that of the small-diameter portion 21c, and expands a region on one side of the opening of the cylindrical member. It is good also as a process of preparing the stepped cylindrical member 21 by setting it as the large diameter part 21a and making the area | region of the opening other side of a cylindrical member into the small diameter part 21c.

  Moreover, such a holder | retainer 11 is employable as a holder | retainer of a needle roller bearing provided with several needle rollers, for example. That is, the needle roller bearing is configured to include a plurality of needle rollers and the cage 11. The needle roller bearing has a stepped cylindrical member 21 having a small diameter portion 21c, a large diameter portion 21a, and a stepped portion 21b. The area on the opening side is expanded so as to be the same as the diameter of the large diameter portion 21a. Therefore, when the diameter of the area on the opening side is increased, the diameter can be increased on the basis of the stepped portion 21b. That is, it is possible to easily perform positioning in the axial direction when the diameter of the opening-side region is expanded using the step portion 21b. Further, in order to press the area on the opening side and the area on the small diameter part side of the expanded diameter area in the axial direction, the thickness can be finely adjusted in the area where the thickness is not sufficient when the diameter is expanded. it can. As a result, a needle roller bearing having a desired shape can be easily obtained.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The present invention is effectively used when manufacturing a V-type or M-type cage.

  11, 51 cage, 12a, 12b, 53a, 53b annular part, 13 pillar part, 14 pocket, 16a, 16b pillar end part, 17a, 17b pillar inclined part, 18 pillar center part, 20 cup-shaped member, 20a bottom part, 20b cylindrical part, 21 stepped cylindrical member, 21a, 22a large diameter cylindrical part, 21b, 22b inclined cylindrical part, 21c, 22c small diameter cylindrical part, 22 cage member, 25 drawing jig, 30 punch, 30a large diameter punch part 30b inclined punch part, 30c small diameter punch part, 31 wall surface, 32 pressing part, 32a large diameter pressing part, 32b inclined pressing part, 32c small diameter pressing part, 35 diameter expanding jig, 36 cam plate, 37 die, 37a, 37b, 37c, 37d Divided dies, 38 support part, 38a large diameter support part, 38b inclined support part, 38c small diameter support part, 39 Diameter part, 39a Large diameter enlarged part, 39b Inclined enlarged part, 39c Small diameter enlarged part, 40 Press part, 41a Retreat part, 41b Protruding part, 41c Inclined part, 42a, 42b, 42c, 42d Wall surface, 52a, 52b Buttocks, 60 joints, 61 sag.

Claims (7)

A method for manufacturing a cage having a substantially V-shaped cross section,
A small diameter portion having a predetermined thickness and having a relatively small diameter on one side of the opening, a large diameter portion having a relatively large diameter on the other side of the opening, the small diameter portion, and the large Preparing a stepped cylindrical member with a stepped cylindrical shape having a stepped portion extending in the radial direction so as to connect the diameter portions;
While making the diameter of the region on the large-diameter portion side of the small-diameter portion the same diameter, the region on the opening side of the small-diameter portion as a reference in the central axis direction of the stepped cylindrical member, A diameter expansion step of expanding the diameter to be the same as the diameter of the large diameter portion;
A pressing step of pressing the region on the opening side and the region on the small diameter part side in the expanded diameter region in the axial direction ;
The diameter expansion step includes a step of supporting the stepped cylindrical member with a support portion,
The support portion includes a large-diameter support portion that supports the large-diameter portion, a small-diameter support portion that supports the small-diameter portion, and an inclined support portion that inclines and connects the large-diameter portion and the small-diameter portion,
A method for manufacturing a cage , wherein the stepped portion is supported by the inclined holding portion . The preparing step includes a cup-shaped member preparing step of preparing a cup-shaped member having a cylindrical cylindrical portion extending straight in the axial direction and a bottom portion covering one end portion of the cylindrical portion, and the diameter of the bottom portion The step of projecting the central portion in the direction to a side different from the side where the cylindrical portion is located, preparing the stepped cylindrical member using the protruding portion as the small diameter portion and the cylindrical portion as the large diameter portion. The method for manufacturing a cage according to claim 1, wherein The preparation step includes a cylindrical member preparation step of preparing a cylindrical member having the same diameter as that of the small-diameter portion, extending straight in the axial direction, and expanding a region on one side of the opening of the cylindrical member. The method for manufacturing a cage according to claim 1, wherein the step is a step of preparing the stepped cylindrical member using the large diameter portion as a region on the other side of the opening of the cylindrical member as the small diameter portion. The manufacturing method of the holder | retainer in any one of Claims 1-3 including the collar part formation process which forms a collar part by bending the axial direction both ends of the said member to an inner diameter side after the said diameter expansion process. The manufacturing method of the holder | retainer in any one of Claims 1-4 including the pocket formation process which forms a some pocket so that the predetermined location of the said member may be opened after the said press process. A cage having a substantially V-shaped cross section,
A small diameter portion having a predetermined thickness and having a relatively small diameter on one side of the opening, a large diameter portion having a relatively large diameter on the other side of the opening, the small diameter portion, and the large A stepped cylindrical member having a stepped cylindrical shape having a stepped portion extending in the radial direction so as to connect the diameter portions is prepared,
While making the diameter of the region on the large-diameter portion side of the small-diameter portion the same diameter, the region on the opening side of the small-diameter portion as a reference in the central axis direction of the stepped cylindrical member, The diameter is expanded to be the same as the diameter of the large diameter portion,
Of the expanded area, press the area on the opening side and the area on the small diameter part side in the axial direction,
At the time of the diameter expansion, a support portion for supporting the stepped cylindrical member is prepared,
The prepared support part includes a large-diameter support part that supports the large-diameter part, a small-diameter support part that supports the small-diameter part, and an inclined support part that inclines and connects the large-diameter part and the small-diameter part. Including
The retainer, wherein the stepped portion is supported by the inclined holding portion . A plurality of needle rollers;
A needle roller bearing having a plurality of pockets for housing the plurality of needle rollers and having a substantially V-shaped cage;
The cage is
A small diameter portion having a predetermined thickness and having a relatively small diameter on one side of the opening, a large diameter portion having a relatively large diameter on the other side of the opening, the small diameter portion, and the large A stepped cylindrical member having a stepped cylindrical shape having a stepped portion extending in the radial direction so as to connect the diameter portions is prepared,
While making the diameter of the region on the large-diameter portion side of the small-diameter portion the same diameter, the region on the opening side of the small-diameter portion as a reference in the central axis direction of the stepped cylindrical member, The diameter is expanded to be the same as the diameter of the large diameter portion,
Of the expanded area, press the area on the opening side and the area on the small diameter part side in the axial direction,
At the time of the diameter expansion, a support portion for supporting the stepped cylindrical member is prepared,
The prepared support part includes a large-diameter support part that supports the large-diameter part, a small-diameter support part that supports the small-diameter part, and an inclined support part that inclines and connects the large-diameter part and the small-diameter part. Including
Supporting the stepped portion with the inclined holding portion;
The needle roller bearing, wherein the plurality of pockets for accommodating the plurality of needle rollers are formed so as to open predetermined portions of the member.

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