Split cage, split roller bearing using the split cage, and method for manufacturing the split cage.

Abstract

This design suppresses wear on both circumferential ends of a pair of semi-annular retainers and prevents an increase in the circumferential gap between the pair of semi-annular retainers. [Solution] A two-piece holder 10 is formed by combining a pair of semi-annular holder bodies 11 and 12 in an annular shape, wherein a first surface 17a located axially inward and a second surface 17b located axially outward are formed on the circumferential end faces 17 of a pair of rim portions 13 of the pair of holder bodies 11 and 12, and in the joint 20 where the pair of holder bodies 11 and 12 are combined circumferentially, the first surface 17a of the pair of rim portions 13 of one holder body 11 and the first surface 17a of the pair of rim portions 13 of the other holder body 12 are in surface contact along the radial direction, and there is a gap in the circumferential direction between the second surface 17b of the pair of rim portions 13 of one holder body 11 and the second surface 17b of the pair of rim portions 13 of the other holder body 12.

Description

Technical Field

[0001] This invention relates to a split cage, a split roller bearing using the split cage, and a method for manufacturing the split cage.

Background Art

[0002] The large end of a connecting rod of an engine such as an automobile or an outboard motor, or a rotating shaft such as a transmission is supported by a roller bearing. For example, when attaching a roller bearing to the large end of a connecting rod of an automobile engine, since it cannot be incorporated from the axial direction, a split roller bearing is used. In this split roller bearing, a split cage is also used. The split cage consists of two semi-annular split members and is used in combination in a circular ring shape.

[0003] As such a split cage, a split member is manufactured by cutting a cage manufactured in a true circular ring shape into two parts with a cutter, and a coating material with a predetermined thickness is applied to at least one of the cut surfaces of the paired split members to reduce the gap in the circumferential direction of the split members (see, for example, Patent Document 1).

[0004] Further, as a split cage, it has two arch portions arranged at intervals in the axial direction and column portions installed at several locations in the circumferential direction of both arch portions, and overhanging portions that protrude more than the column portions in the circumferential direction are provided at both circumferential ends of both arch portions, and chamfers are provided at the corners on the outer side in the axial direction on the tip side of the overhanging portions (see, for example, Patent Document 2).

[0005] In the split cage described in Patent Document 2, the circumferential length of the chamfer portion is set to be larger than the overhanging length of the overhanging portion. Thereby, when used in combination of two, axial misalignment can be corrected.

Prior Art Documents

Patent Documents

[0006] [Patent Document 1] Japanese Utility Model Publication No. 6-6746 [Patent Document 2] Japanese Patent Publication No. 2004-132473 [Overview of the project] [Problems that the invention aims to solve]

[0007] In the two-part retainer described in Patent Document 1, the column portion of the retainer, which is manufactured in a perfect circular annular shape, is cut into two parts using a cutter. As a result, the circumferential dimension of the column portion of the paired two-part members is reduced by at least the thickness (wall thickness) of the cutter blade. The circumferential width dimension of the column portion at the cut portion of the two-part member is smaller than that of the column portion other than the cut portion, resulting in a decrease in strength. Furthermore, applying a coating material of a predetermined thickness to reduce the circumferential gap between the paired two-part members increases costs.

[0008] On the other hand, the two-piece retainer described in Patent Document 2 is manufactured by forming a long strip of metal sheet into an M-shape in cross-section, creating rectangular pockets along the longitudinal direction of the strip of metal sheet using a punching tool, forming claw-shaped retainers at predetermined positions on the column portion, curving it into a semi-cylindrical shape for a predetermined length, and cutting it within the circumferential width of the pocket (see Figures 4(a) to (c) of Patent Document 2). Since it is cut within the circumferential width of the pocket, the circumferential thickness of the column portion does not decrease.

[0009] Here, when manufacturing the two-piece holder described in Patent Document 2, for example, when cutting a strip of metal sheet with a general press machine, the cutting direction is from the top to the bottom of the strip of metal sheet, as shown in Figure 4(a) of Patent Document 2, and is perpendicular to the length direction.

[0010] With this cutting direction, as shown in the upper part of Figure 10(a), the cut surface at one end of the strip-shaped metal plate 50, which has been curved into a semi-cylindrical shape and then cut, is a surface 50a perpendicular to the radial direction with respect to the circumferential length direction. In contrast, as shown in the lower part of Figure 10(a), the cut surface at the other end of the strip-shaped metal plate 50, which has been curved into a semi-cylindrical shape after cutting, is a tapered surface 50b that slopes circumferentially from the outer circumference to the inner circumference due to the difference in circumference between the inner and outer diameters. Therefore, the shape of the cut surface differs at both ends of the semi-cylindrical strip-shaped metal plate 50.

[0011] The two semi-cylindrical strip-shaped metal plates 50 formed in this way are assembled to form a ring when in use. In this case, as shown in Figure 10(b), when the right-angle surfaces 50a and tapered surfaces 50b are facing each other in the circumferential direction, the leading edges (edge ​​portions) on the outer circumference of the tapered surfaces 50b come into contact with each other and wear down. This wear of the edge portions may increase the circumferential gap between the two semi-cylindrical strip-shaped metal plates 50. Also, as shown in Figures 11(a) and (b), when the right-angle surface 50a and tapered surface 50b are facing each other at two points in the circumferential direction, the edge portions of the tapered surfaces 50b come into contact with the right-angle surface 50a at each point and wear down. In this case as well, this wear of the edge portions may increase the circumferential gap between the two semi-cylindrical strip-shaped metal plates 50.

[0012] Therefore, the objective of this invention is to suppress wear on both circumferential ends of a pair of semi-annular retainers and to suppress the increase in the circumferential gap between the pair of semi-annular retainers. [Means for solving the problem]

[0013] To solve the above problems, the two-piece holder of this invention comprises the following configuration 1 and configuration 2. [Configuration 1] A pair of semi-annular retainer bodies are combined to form an annular structure, and each of the retainer bodies has a pair of semi-annular rim portions that face each other in the axial direction, and a plurality of column portions provided between the pair of rim portions at circumferential intervals. In a two-piece retainer in which a pocket for holding rollers is provided between the pair of rim portions and between the circumferentially adjacent column portions, The circumferential ends of the pair of rim portions of the pair of retaining bodies protrude circumferentially outward from the column portions located at the circumferential ends, A first surface located axially inward and a second surface located axially outward are formed on the circumferential end faces of the pair of rim portions of the pair of retainer bodies. The pair of retaining bodies have a joint portion that is joined to each other in the circumferential direction, A two-piece retainer characterized in that, when the pair of retainer bodies are in contact with each other, and at the joint portion, the first surfaces of the pair of rims of one of the retainer bodies and the first surfaces of the pair of rims of the other retainer body are in surface contact along the radial direction, there is a gap in the circumferential direction between the second surfaces of the pair of rims of one of the retainer bodies and the second surfaces of the pair of rims of the other retainer body.

[0014] In this configuration, at the joint between the pair of retainer bodies, the first surfaces of the pair of rims of one retainer body and the first surfaces of the pair of rims of the other retainer body are in surface contact along the radial direction. Therefore, wear on the circumferential ends of each of the pair of rims of the pair of retainer bodies can be suppressed.

[0015] Furthermore, at the joint between the pair of retainer bodies, there is a circumferential gap between the second surfaces of the pair of rims of one retainer body and the second surfaces of the pair of rims of the other retainer body. This allows lubricating oil to easily flow axially inward from the gap through the first surfaces of the pair of retainer bodies into the pocket.

[0016] [Configuration 2] The split retainer according to configuration 1, characterized in that the axial width dimension of the first surface of the pair of rim portions of the pair of retainers is formed to be 40 to 60% of the axial width dimension of the circumferential end surface of the pair of rim portions of the pair of retainers.

[0017] According to this configuration, in the mating portion of the pair of cage bodies, it is possible to ensure the area of surface contact between the first surfaces of the pair of rim portions of one cage body and the first surfaces of the pair of rim portions of the other cage body.

[0018] In order to solve the above problems, the split roller bearing of the present invention has the following Configuration 3. [Configuration 3]<00​​​​​​​​​​​​​​​​​​​​​​A third step of creating the pair of cage bodies by bending the pair of cage material blanks into a semi-annular shape such that the cut end faces of the pair of rim portions are along the radial direction is included. In the second step, the cut end faces on both sides in the longitudinal direction of the pair of rim portions of the pair of cage material blanks are inclined surfaces that incline outward in the longitudinal direction of the cage material blank from one outer edge portion to the other outer edge portion in the plate thickness direction of the cage material blank. A method for manufacturing a split cage, characterized in that.

[0021] According to this method, it is possible to easily form end faces along the radial direction with respect to the end portions of the pair of rim portions of the pair of cage bodies. Further, in a state where the pair of cage bodies are in contact with each other, at the mating portion, the end faces of the pair of rim portions of one cage body and the end faces of the pair of rim portions of the other cage body can be brought into surface contact.

[0022] [Configuration 5] When the plate thickness of the pair of cage material blanks is t, the inner diameter of the pair of rim portions of the pair of cage bodies is r, the inner diameter side circumferential length of the pair of rim portions of the pair of cage bodies is r×π, and the outer diameter side circumferential length of the pair of rim portions of the pair of cage bodies is (r + t)×π, the inclination angle θ of the inclined surface is defined by the following formula (1) with respect to the plate thickness direction of the pair of cage material blanks. A method for manufacturing a split cage according to Configuration 4, characterized in that. θ = tan , , ,

[0023] , , , , ,

[0022] , , , , -1 , , ,

[0024] , (π / 2)···(1)

[0023] In the second step, by using a cutting jig to make the cut end faces on both sides in the longitudinal direction of the pair of rim portions of the strip-shaped material into inclined surfaces with the inclination angle θ, in the third step, the cut end faces of the pair of rim portions of the pair of cage bodies can be made to be in a state along the radial direction.

Effect of the Invention

[0024] As described above, by adopting the above configuration, this invention can suppress wear at both circumferential ends of the pair of rim portions of the pair of cage bodies and suppress an increase in the clearance between the pair of cage bodies.

Brief Description of the Drawings

[0025] [Figure 1] Perspective view showing the two-piece holder of this invention [Figure 2] (a) Enlarged perspective view of a key part showing the end of the rim of the retainer body, (b) Enlarged perspective view of a key part showing the end face of the rim of the retainer body. [Figure 3] (a) Enlarged plan view of the main part showing the joint of the rims of the pair of retaining bodies, (b) Cross-sectional view along line AA in Figure 3(a) [Figure 4] A partially cutaway cross-sectional view showing the usage state of the split roller bearing of this invention. [Figure 5] Cross-sectional view along line BB in Figure 4 [Figure 6] This diagram illustrates the manufacturing method of the split roller bearing of this invention. [Figure 7] Perspective view showing the strip material after the first step of the same process. [Figure 8] Diagram illustrating the second step of the same process. [Figure 9] Front view showing the main parts of the retainer material after the second step as described above. [Figure 10] (a) Front view showing the usage state of a pair of retainer bodies of a conventional two-piece retainer, (b) Enlarged front view showing the circumferential ends of the pair of retainer bodies shown in Figure 10(a) [Figure 11] (a) Front view showing another usage state of the pair of retainer bodies of a conventional two-piece retainer, (b) Enlarged front view showing the circumferential ends of the pair of retainer bodies shown in Figure 11(a) [Modes for carrying out the invention]

[0026] Embodiments of this invention will be described based on the drawings. The split cage 10 of the embodiment shown in Figures 1 to 3 is formed by combining a pair of semi-annular cage bodies 11 and 12 into an annular shape. The split cage 10 holds a plurality of rollers 3 arranged on the inner circumference of the outer ring 2 of the split roller bearing 1 of the embodiment so that they can roll (see Figure 4). In the following, the direction parallel to the rotation axis O of the split roller bearing 1 is called the axial direction, the direction perpendicular to the rotation axis O is called the radial direction, and the direction along the arc centered on the rotation axis O is called the circumferential direction. Furthermore, the axial inner side refers to the side approaching the center of the cage, and the axial outer side refers to the side away from the center of the cage.

[0027] Of the pair of semi-annular retainer bodies, one retainer body 11 has a pair of semi-annular rim portions 13 that face each other in the axial direction, and a plurality of column portions 14 that are provided so as to be spanned between the pair of rim portions 13 at intervals in the circumferential direction. A pocket 15 is provided in the retainer body 11 between the pair of rim portions 13 and between circumferentially adjacent column portions 14.

[0028] Each pair of rim portions 13 has a flange portion 16 that extends radially inward. The flange portion 16 is provided along the entire length of the retainer body 11. The pair of rim portions 13 protrude circumferentially outward from the column portions 14 located at both ends in the circumferential direction. End faces 17 facing circumferentially outward are formed on both circumferential ends 11a that constitute the protruding portion.

[0029] As shown in Figures 2(a) and 2(b), the end face 17 has a first face 17a located axially inward and a second face 17b located axially outward. The first face 17a is provided within an axial range from the axially inward edge of the rim portion 13 to the axially inward edge 16a of the flange portion 16. The first face 17a is a smooth surface. The second face 17b is provided within an axial range from the axially outer edge of the first face 17a to the axially outer edge of the rim portion 13 (the axially outer edge of the flange portion 16). Furthermore, the second face 17b is slightly inclined circumferentially inward from the axially outer edge of the first face 17a toward the axially outward direction (see dashed line in Figure 2(b)). The second face 17b is formed as a rough surface.

[0030] The axial width dimension h1 of the first surface 17a is formed to be 40-60% of the axial width dimension h0 of the circumferential end faces 17 of the pair of rim portions 13. If the axial width dimension h1 of the first surface 17a is less than 40% of the axial width dimension h0 of the circumferential end faces 17 of the pair of rim portions 13, the surface contact area between the first surface 17a of the pair of rim portions 13 of one retainer body 11 and the first surface 17a of the pair of rim portions 13 of the other retainer body 12 will be reduced in the joint portion 20 described later, and the effect of suppressing wear of each end 11a may be reduced. On the other hand, if the axial width dimension h1 of the first surface 17a exceeds 60% of the axial width dimension h0 of the circumferential end faces 17 of the pair of rim portions 13, the amount of lubricating oil flowing between the first surfaces 17a of the pair of retainer bodies 11 and 12 into the pocket 15 may decrease in the joint portion 20 described later, potentially reducing the lubrication between the pocket 15 and the inner surface 3.

[0031] The column portion 14 has a pair of column ends 14a formed axially inward from a pair of rim portions 13, a pair of column inclined portions 14b inclined axially and radially inward from the pair of column ends 14a, and a column central portion 14c spanning between the pair of column inclined portions 14b. The radial inner edge of the column central portion 14c is located radially inward with respect to the radial inner edge of the flange portion 16 of the pair of rim portions 13. In adjacent column portions 14 in the circumferential direction, the circumferentially facing surfaces of the pair of column ends 14a, the pair of column inclined portions 14b, and the column central portion 14c serve as guide surfaces for the rollers 3. Of the two-part retainer 10, the other retainer body 12 has the same form as the retainer body 11, so the same reference numerals as the retainer body 11 are used for each part, and its description is omitted.

[0032] As shown in Figure 3(a), when the pair of retainers 11 and 12 are assembled to form an annular shape, the ends 11a of the pair of rim portions 13 of one retainer 11 and the ends 11a of the pair of rim portions 13 of the other retainer 12 are joined to each other in the circumferential direction to form a joint portion 20. When the pair of retainers 11 and 12 are in contact with each other, the first surface 17a formed on the end faces 17 of the pair of rim portions 13 of the retainer 11 and the first surface 17a formed on the end faces 17 of the pair of rim portions 13 of the retainer 12 are in radial surface contact at the joint portion 20.

[0033] Furthermore, when the pair of retainer bodies 11 and 12 are in contact with each other, there is a gap in the circumferential direction between the second surface 17b formed on the end faces 17 of the pair of rim portions 13 of the retainer body 11 and the second surface 17b formed on the end faces 17 of the pair of rim portions 13 of the retainer body 12 at the joint portion 20.

[0034] As shown in Figure 3(b), when the pair of cage bodies 11 and 12 are in contact with each other, the first surface 17a of the joint portion 20 is aligned radially and located on the axial plane P of the split roller bearing 1.

[0035] Figures 4 and 5 show a split roller bearing 1 of an embodiment. The split roller bearing 1 of this embodiment is installed in a location where it cannot be assembled axially from the axial end. For example, the split roller bearing 1 is installed between the crankpin 30 and the connecting rod big end 31 in the crankshaft of an engine (not shown) such as an automobile or outboard motor. Counterweights 32 are arranged on both sides of the crankpin 30 in the axial direction.

[0036] The split roller bearing 1 comprises an outer ring 2, a plurality of rollers 3 arranged on the inner circumference of the outer ring 2, and a split cage 10 of the embodiment. The outer ring 2 is formed by combining two split outer ring bodies 2a, 2a, which are divided in the circumferential direction, into an annular shape. An outer ring raceway surface 2b is formed on the inner circumferential surfaces of the two split outer ring bodies 2a, 2a. The outer circumferential surface of the outer ring 2 is fitted to the inner circumferential surface of the connecting rod big end 31.

[0037] Multiple rollers 3 are needle-shaped rollers. Multiple rollers 3 are interposed between the outer ring raceway surface 2b of the outer ring 2 and the outer circumferential surface of the crank pin 30 so as to be able to roll. Multiple rollers 3 are arranged at intervals in the circumferential direction by a split cage 10. The split cage 10 is formed by combining the pair of cage bodies 11 and 12 described above in an annular shape. The pair of cage bodies 11 and 12 hold the rollers 3 so as to be able to roll within their respective pockets 15.

[0038] A bearing cap 33 is attached to the connecting rod big end 31, and the connecting rod big end 31 is provided with a semicircular recessed bearing seat surface 31a. The bearing cap 33 is provided with a semicircular recessed bearing seat surface 33a. The bearing cap 33 is fastened to the connecting rod big end 31 with bolts 34, and a circular through hole 35 is formed by the bearing seat surfaces 31a and 33a. A split roller bearing 1 is fitted into this circular through hole 35. The split roller bearing 1 supports the connecting rod big end 31 so that it can swing relative to the crankpin 30.

[0039] As shown in Figure 3(a), in the split cage 10 of the split roller bearing 1, when the pair of cage bodies 11 and 12 are in contact with each other, the first surface 17a of the end 11a of cage body 11 and the first surface 17a of the end 11a of cage body 12 are in radial surface contact at the joint 20. In this surface contact state, wear of the respective ends 11a of the pair of cage bodies 11 and 12 can be suppressed. Furthermore, an increase in the circumferential gap between the ends 11a of the pair of cage bodies 11 and 12 can be suppressed. As a result, collisions between the ends of the pair of cage bodies 11 and 12 become less likely, and collision noise is suppressed. Furthermore, excessive stress is not generated on the column portions 14 of the pair of cage bodies 11 and 12 due to collisions, and damage to the pair of cage bodies 11 and 12 can be prevented.

[0040] Furthermore, in the split cage 10, when the pair of cage bodies 11 and 12 are in contact with each other, there is a circumferential gap at the joint 20 between the second surface 17b formed on the end faces 17 of the pair of rim portions 13 of the cage body 11 and the second surface 17b formed on the end faces 17 of the pair of rim portions 13 of the cage body 12. As a result, in the split cage 10, at the joint 20, lubricating oil can easily flow axially inward from the gap through the first surfaces 17a of the pair of cage bodies 11 and 21 into the interior of the pocket 15. The flow of lubricating oil into the interior of the pocket 15 improves the lubrication between the inner surface 3 of the pocket 15. In this embodiment, the split roller bearing 1 was described using an example without an inner ring, but it may also have an inner ring. In this case, the inner ring can be an annular shape that is not divided in the circumferential direction, or a combination of two divided inner rings that are divided in two in the circumferential direction.

[0041] Next, the manufacturing method of the two-piece holder 10 will be explained with reference to Figures 6 to 9. The two-piece holder 10 is manufactured through the first, second, and third steps shown in Figure 6, as described below.

[0042] The first step is to obtain a strip-shaped material X by performing existing press working and punching processes on a long, strip-shaped metal sheet. The strip-shaped metal sheet has a width dimension which is the thickness of the column end 14a of the column portion 14 and the axial width dimension of the two-part holder 10 plus a length corresponding to the protruding length of each flange portion 16 of the pair of rim portions 13, and the length direction is perpendicular to the width direction and the thickness direction.

[0043] The first step, as shown in Figure 7, involves bending both ends of the strip-shaped metal plate in the width direction at right angles in the same direction to form a pair of rim portions 13 having flange portions 16, and forming a column portion 14 between the pair of rim portions 13 in the width direction, having a pair of column ends 14a, a pair of column inclined portions 14b, and a column central portion 14c to create a strip-shaped material X. A pocket 15 is formed between adjacent column portions 14 of the strip-shaped material X. At this time, the plate thickness t of the strip-shaped material X represents the distance from the upper edge of the pair of rim portions 13 to the lower edge of the flange portion 16. The width dimension W of the strip-shaped material X represents the distance between the two outer edges of the pair of rim portions 13 in the width direction, and is the same length as the axial dimension of the two-piece retainer 10.

[0044] The second step is to cut the strip material X to the required length using two cutting jigs 40 to obtain a pair of holder materials Y. The two cutting jigs 40 are punches having cutting blades 40a on both sides in the longitudinal direction of the strip material X. Each cutting blade 40a is inclined with an angle α that is downward and outward in the longitudinal direction of the strip material X, with respect to the thickness direction of the strip material X.

[0045] The second step involves placing two cutting jigs 40 in the same pocket 15 between the column portions 14 of the strip material X, and moving the two cutting jigs 40 outward in the width direction of the strip material X toward a die (not shown) located on the outside in the width direction of the strip material X, thereby cutting a pair of rim portions 13 from the inside outward in the width direction of the strip material X to create a pair of retainer materials Y of the required length.

[0046] When performing the second step, the lengthwise dimension of the pocket 15 of the strip material X may be too small for the two cutting jigs 40 to fit inside the pocket 15, or the cutting jigs 40 may be too small and lack sufficient strength. In this case, after the first step, one or more column sections 14 are removed, or the cutting jigs 40 are enlarged to improve their strength. In this embodiment, as shown in Figure 8, multiple column sections 14 are removed before performing the second step. In Figure 8, the white arrows indicate the direction in which the cutting jig 40 (punch) cuts a pair of column sections 13, and the black arrows indicate the direction in which the pair of column sections 13 are received by the die (not shown).

[0047] In the second step, in a pair of retainer materials Y having the required length, the ends 11a of the pair of rim portions 13 in both longitudinal directions protrude circumferentially outward from the column portions 14 located at both ends in the longitudinal direction. As shown in Figure 9, end faces 17, which become the cut end faces by the cutting jig 40, are formed on the ends 11a of the pair of rim portions 13 of the retainer material Y. The end faces 17 are inclined upward and outward in the longitudinal direction of the retainer material Y with respect to the plate thickness direction of the retainer material Y, and are inclined at the same inclination angle θ as the inclination angle α of the cutting blade 40a of the cutting jig 40.

[0048] The inclination angle θ of the end face 17 that forms an inclined surface is defined by the following equation (1), with respect to the thickness direction of the pair of retainer materials Y, where t is the plate thickness of the pair of retainer materials Y, r is the inner diameter of the pair of retainer bodies 11 and 12, r × π is the inner diameter side circumference of the pair of rim portions 13 of the pair of retainer bodies 11 and 12, and (r + t) × π is the outer diameter side circumference of the pair of rim portions 13 of the pair of retainer bodies 11 and 12. θ = tan -1 (π / 2)···(1) Although the inclination angle θ is constant regardless of the plate thickness t, as shown in (1), it is common for it to have a variation of ±1° due to processing accuracy requirements.

[0049] The third step is to bend a pair of retainer materials Y into a semi-annular shape so that the end faces 17 of the pair of rim portions 13 are aligned radially, thereby obtaining a pair of retainer bodies 11 and 12. In the third step, the pair of retainer materials Y are bent into a semi-annular shape so that the flange portions 16 of the pair of rim portions 13 are located on the inner diameter side. At this time, the pair of retainer materials Y are bent so that the inner diameter of the resulting pair of retainer bodies 11 and 12 is the inner diameter r described above.

[0050] The pair of retainer bodies 11 and 12 obtained in the third step have end faces 17 formed on the ends 11a of the pair of rim portions 13. A shear surface is formed on the axially inward side of this end face 17, and a fracture surface is formed on the axially outward side. The shear surface of the end face 17 is a smooth surface along the direction of movement (shear direction) of the cutting blade 40a of the cutting jig 40 in the second step, and becomes the first surface 17a of the end face 17 in the third step. The fracture surface of the end face 17 is a rough surface created when the material of the pair of strip-shaped materials X is torn by the cutting jig 40 in the second step, and becomes the second surface 17b of the end face 17 in the third step.

[0051] A two-piece retainer 10 is manufactured by the above manufacturing method. This two-piece retainer 10 can easily form the first surface 17a of the radially aligned end face 17 on the ends 11a of the pair of rim portions 13 of the pair of retainer bodies 11 and 12. Therefore, when the pair of retainer bodies 11 and 12 are in contact with each other, the first surface 17a of the pair of rim portions 13 of one retainer body 11 and the first surface 17a of the pair of rim portions 13 of the other retainer body 12 can be brought into surface contact at their joint 20.

[0052] Furthermore, when the pair of retainer bodies 11 and 12 are in contact with each other, a circumferential gap can be created at the joint 20 between the second surfaces 17b of the pair of rim portions 13 of one retainer body 11 and the second surfaces 17b of the pair of rim portions 13 of the other retainer body 12. [Explanation of Symbols]

[0053] 1. Split roller bearing 2 Outer ring 2a Divided outer ring 3 around 10. Two-piece retainer 11, 12 Cage body 11a End 13 Rim section 14 Pillar section 15 pockets 16 Flange section 17 End face 17a Front page 17b Second side 20 Joint 30 Crankpin 31 Connecting rod big end 32 Counterweight 33 Bearing cap 40 Cutting jigs 40a cutting blade 50 Strip-shaped metal plate 50a Right-angle surface 50b Tapered surface h0 Axial width dimension of the circumferential end face of the rim portion h1 Axial width dimension of the first surface of the rim X Strip material Y Cage material

Claims

1. A pair of semi-annular retainer bodies are combined to form an annular structure, and each of the retainer bodies has a pair of semi-annular rim portions that face each other in the axial direction, and a plurality of column portions provided between the pair of rim portions at circumferential intervals. In a two-piece retainer in which a pocket for holding rollers is provided between the pair of rim portions and between the circumferentially adjacent column portions, The circumferential ends of the pair of rim portions of the pair of retaining bodies protrude circumferentially outward from the column portions located at the circumferential ends, A first surface located axially inward and a second surface located axially outward are formed on the circumferential end faces of the pair of rim portions of the pair of retainer bodies. The pair of retaining bodies have a joint portion that is joined to each other in the circumferential direction, A two-piece retainer characterized in that, when the pair of retainer bodies are in contact with each other, and at the joint portion, the first surfaces of the pair of rims of one of the retainer bodies and the first surfaces of the pair of rims of the other retainer body are in surface contact along the radial direction, there is a gap in the circumferential direction between the second surfaces of the pair of rims of one of the retainer bodies and the second surfaces of the pair of rims of the other retainer body.

2. The two-piece retainer according to claim 1, characterized in that the axial width dimension of the first surface of the pair of rim portions of the pair of retainers is formed to be 40 to 60% of the axial width dimension of the circumferential end surface of the pair of rim portions of the pair of retainers.

3. In a two-piece roller bearing, which has an outer ring, a plurality of rollers arranged on the inner circumference of the outer ring, and a cage that holds the plurality of rollers so as to be able to roll on the inner circumference of the outer ring, the outer ring is divided into two parts in the circumferential direction, and the two divided outer ring bodies are combined in an annular shape, A split roller bearing characterized in that the cage is a split cage according to claim 1 or claim 2.

4. It is constructed by combining a pair of semi-annular retaining bodies in an annular shape, and each of the retaining bodies has a pair of semi-annular rim portions that face each other in the axial direction, and a plurality of column portions provided between the pair of rim portions at circumferential intervals, In a method for manufacturing a two-piece retainer, a pocket for holding rollers is provided between the pair of rim portions and between the circumferentially adjacent column portions, A first step is to create a strip-shaped material by punching out a strip-shaped metal sheet, in which a pair of rim portions and a plurality of column portions are formed between the pair of rim portions, A second step involves placing two cutting jigs between the columnar portions of the strip-shaped material, moving the two cutting jigs outward in the width direction, and cutting the pair of rim portions outward from the inside in the width direction to create a pair of retainer materials of the required length. The third step includes bending the pair of retainer materials into a semi-annular shape so that the cut end faces of the pair of rim portions are aligned radially, thereby creating the pair of retainer bodies. A method for manufacturing a two-piece retainer, characterized in that, in the second step, the cut end faces on both sides in the longitudinal direction of the pair of rim portions of the pair of retainer materials are inclined surfaces that incline outward in the longitudinal direction of the retainer material from one outer edge in the thickness direction of the retainer material to the other outer edge.

5. The method for manufacturing a two-piece retainer according to claim 4, characterized in that, when the plate thickness of the pair of retainer materials is t, the inner diameter of the pair of rim portions of the pair of retainer bodies is r, the inner diameter side circumference of the pair of rim portions of the pair of retainer bodies is r × π, and the outer diameter side circumference of the pair of rim portions of the pair of retainer bodies is (r + t) × π, the inclination angle θ of the inclined surface is defined by the following formula (1) with reference to the plate thickness direction of the pair of retainer materials. θ = tan －１ (p / 2)・・・(1)

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