Roller bearing

Abstract

The utility model relates to a kind of roller bearings. The roller bearing includes inner ring (2), outer ring, multiple rollers being arranged between inner ring (2) and outer ring and retainer for retaining roller. Flange portion (6) is provided at the axial end of inner ring (2) or outer ring. Edge chamfer (Cf) is provided at the inner side edge portion (9) of flange portion (6). In the section observed by cutting flange portion (6) with the imaginary plane containing the axis of the roller bearing, the size (L1) of the inclined surface of edge chamfer (Cf) is 1mm or more and 5mm or less. And on the section, the radial peripheral surface (6a) and axial inner side surface (6b) of flange portion (6) have flat portion (16, 17) respectively. The axial outer side edge portion (Cfa) of edge chamfer (Cf) is connected with the flat portion (16) arranged on the radial peripheral surface (6a) of flange portion (6), and the axial inner side edge portion (Cfb) of edge chamfer (Cf) is connected with the flat portion (17) arranged on the axial inner side surface (6b) of flange portion (6).

Description

Technical Field

[0001] This utility model relates to a roller bearing having a flange at the axial end of the inner or outer ring, and to a technique for improving the insertion performance of the roller. Background Technology

[0002] A type of roller bearing exists in which multiple rollers are arranged freely between an inner and outer ring via a retainer open on one side of the axial direction, and the axial end of the inner or outer ring has a flange (Patent Document 1). For example... Figure 11 As shown, in order to insert the roller 50 during the assembly of the roller bearing, the outer peripheral surface of the front end of the roller 50 in the insertion direction contacts the column portions on both sides of the retainer 51 in the circumferential direction. At the same time, with the outer peripheral surface of the base end of the roller 50 in the insertion direction in contact with the small flange portion 52a of the inner ring 52, an insertion force F1 is applied to the roller 50 to perform the roller insertion operation.

[0003] When inserting the roller, indentations or scratches may occur on the track surface 52b of the inner ring 52. To avoid such indentations or scratches, such as... Figure 12 and Figure 13 As shown, the insertion groove 53 for inserting the roller, which is provided on a portion of the circumferential direction of the small flange portion 52a, is deepened radially. Without the insertion groove 53, the radial height of the small flange portion 52a would typically be reduced so that the roller 50 can be easily inserted.

[0004] [Existing Technical Documents]

[0005] [Patent Literature]

[0006] [Patent Document 1] JP Japanese Patent Application Publication No. 2005-344848 Utility Model Content

[0007] [Problem to be solved by the utility model]

[0008] While the above methods can avoid indentations or scratches on track surface 52b, if... Figure 11 As shown, when inserting the roller 50, since the inner edge of the flange 52a or the insertion groove 53 comes into contact with the rolling surface of the roller 50, there are assembly problems such as increased force required to insert the roller 50 and difficulty in inserting the roller 50.

[0009] The purpose of this invention is to provide a roller bearing that improves assembly performance compared to existing structures.

[0010] [Methods used to solve problems]

[0011] (Technical Solution 1)

[0012] The roller bearing of this utility model includes an inner ring, an outer ring, a plurality of rollers disposed between the inner ring and the outer ring, and a retainer for holding the rollers. A flange portion is provided at the axial end of the inner ring or the outer ring.

[0013] The flange portion has a chamfer on its inner edge. In a cross-section observed by cutting the flange portion with an imaginary plane containing the axis of the roller bearing, the size of the chamfer is 1 mm or more and 5 mm or less. Furthermore, in the cross-section, the radial circumferential surface and the axial inner surface of the flange portion each have a flat portion.

[0014] The "flange portion" is a flange-shaped part used to prevent the roller from falling off the inner or outer ring. When the inner ring has a "flange portion" at its axial end, the "flange portion" is integrally formed with the axial end of the inner ring, protruding radially outward by a predetermined length. "Integratedly formed" here means that the axial end of the inner ring and the flange portion are not composed of multiple parts, but are formed from a single material through forging, machining, or other methods, becoming part or a whole of a single object. When the outer ring has a "flange portion" at its axial end, the "flange portion" is integrally formed with the axial end of the outer ring, protruding radially inward by a predetermined length.

[0015] The term "inner edge portion" refers to the axially inner edge portion of the flange portion. In other words, the "inner edge portion" refers to the boundary portion between the circumferential surface of the flange portion and the axially inner surface of the flange portion that connects to the track surface.

[0016] When the axial end of the inner ring is provided with a "flange", the "inner edge" refers to the boundary portion between the outer peripheral surface of the flange and the axial inner surface of the flange that is connected to the inner ring track surface.

[0017] When the outer ring has a "flange" at its axial end, the "inner edge" refers to the boundary between the inner circumferential surface of the flange and the axial inner surface of the flange that connects to the outer ring track surface.

[0018] According to this structure, in the so-called longitudinal section observed by cutting the flange portion with an imaginary plane containing the axis of the roller bearing, the chamfered surface dimension is set to be 1 mm or more and 5 mm or less. Therefore, when a roller is inserted into the inner or outer ring having the flange portion, the flat portion of the radial circumferential surface of the flange portion and the chamfered surface of the flange portion will slide into contact with the rolling surface of the roller. When the roller is housed in the retainer's pocket, the chamfered surface of the flange portion will slide into contact with the rolling surface of the roller, and simultaneously, the outer circumferential surface of the front end of the roller in the insertion direction will slide into contact with the track surface. Because the chamfered surface dimension is 1 mm or more and 5 mm or less, the surface pressure acting on the roller can be reduced, especially when the chamfered surface slides into contact with the rolling surface of the roller, compared to conventional structures. Therefore, stress concentration on the roller can be reduced compared to conventional structures.

[0019] Therefore, compared to traditional structures, the force required to insert the roller (insertion force) can be reduced, allowing the roller to be inserted smoothly. Thus, assembly performance is improved compared to traditional structures. When the size of the inclined plane is less than 1 mm, the effect of reducing the surface pressure acting on the roller is poor; when the size of the inclined plane exceeds 5 mm, it increases the number of processing steps, leading to higher manufacturing costs. Furthermore, in the longitudinal section, by having flat portions on both the radial circumferential surface and the axial inner surface of the flange, the rigidity of the flange can be ensured, preventing unintended plastic deformation of the flange shape.

[0020] (Technical Solution 2)

[0021] Alternatively, the flange may have an insertion groove for inserting a roller.

[0022] The inner edge of the insertion groove is provided with the chamfer, and on the cross section, the flat part is respectively provided on the radial circumferential surface of the bottom of the insertion groove and the axial inner surface of the flange.

[0023] The "insertion groove" refers to a recess, for example, with an arc-shaped cross-section, provided on the outer or inner diameter surface of the flange portion, extending axially by the thickness of the flange portion. When the inner ring has a "flange portion" at its axial end, the "insertion groove" is provided on the outer diameter surface of the flange portion. When the outer ring has a "flange portion" at its axial end, the "insertion groove" is provided on the inner diameter surface of the flange portion.

[0024] According to this structure, in a roller bearing with an insertion groove in the flange portion, the chamfered surface size of the inner edge of the insertion groove in the longitudinal section of the flange portion is set to be 1 mm to 5 mm. Therefore, when a roller is inserted into the inner or outer ring with the flange portion, the flat portion of the radial circumferential surface of the groove bottom and the chamfered surface of the insertion groove slide into contact with the rolling surface of the roller. When the roller is housed in the retainer pocket, the chamfered surface of the insertion groove slides into contact with the rolling surface of the roller, and simultaneously, the outer circumferential surface of the front end of the roller in the insertion direction slides into contact with the track surface. Because the chamfered surface size is 1 mm to 5 mm, the surface pressure acting on the roller is reduced, especially when the chamfered surface slides into contact with the rolling surface of the roller, compared to conventional structures. Therefore, stress concentration on the roller is reduced compared to conventional structures. Consequently, the insertion force of the roller is reduced compared to conventional structures, allowing for smooth roller insertion. Therefore, compared with traditional structures, it can achieve improved assembly performance.

[0025] (Technical Solution 3)

[0026] Alternatively, if a chamfer is provided on the inner edge of the flange, the outer axial edge of the chamfer is connected to a flat portion provided on the radial circumferential surface of the flange, and the inner axial edge of the chamfer is connected to a flat portion provided on the inner axial surface of the flange. In this case, the flange can be easily formed without the need for a special grinding wheel, etc. Therefore, manufacturing costs can be further reduced.

[0027] (Technical Solution 4)

[0028] Alternatively, if a chamfer is provided on the inner edge of the insertion groove, the outer axial edge of the chamfer is connected to a flat portion provided on the radial circumferential surface of the groove bottom, and the inner axial edge of the chamfer is connected to a flat portion provided on the inner axial surface of the flange.

[0029] In this configuration, the flange can be easily formed without the need for specialized grinding wheels or similar equipment. This allows for further reductions in manufacturing costs.

[0030] Any combination of at least two components disclosed in the claims and / or description and / or drawings is included in this utility model. In particular, any combination of two or more claims in the claims is included in this utility model. Attached Figure Description

[0031] The present invention will become clearer through the following description of preferred embodiments with reference to the accompanying drawings. However, the embodiments and drawings are for illustration and description only and should not be used to limit the scope of the present invention. The scope of the present invention is defined by the claims. In the drawings, the same symbols in the plurality of drawings denote the same or corresponding parts.

[0032] Figure 1 This is a longitudinal cross-sectional view of the roller bearing according to the first embodiment of this utility model.

[0033] Figure 2 This is an enlarged cross-sectional view of the flange of the roller bearing.

[0034] Figure 3A This is a partial cross-sectional view of the inner ring assembly showing the method of inserting the rollers in the roller bearing.

[0035] Figure 3B This is a partial cross-sectional view of the inner ring assembly, showing the stage where the roller is further inserted axially.

[0036] Figure 4 This is a longitudinal cross-sectional view of the roller bearing according to the second embodiment of this utility model.

[0037] Figure 5 From Figure 4 The arrow view around the insertion groove when observing the roller bearing in the direction of arrow A.

[0038] Figure 6 This is an enlarged cross-sectional view of the flange and the periphery of the insertion groove of the roller bearing.

[0039] Figure 7 This is a longitudinal cross-sectional view of the roller bearing according to the third embodiment of this utility model.

[0040] Figure 8 This is an enlarged cross-sectional view of the flange of the roller bearing.

[0041] Figure 9 This is a longitudinal cross-sectional view of the roller bearing according to the fourth embodiment of this utility model.

[0042] Figure 10 This is an enlarged cross-sectional view of the flange and the periphery of the insertion groove of the roller bearing.

[0043] Figure 11 This is a longitudinal cross-sectional view illustrating the main parts of a conventional roller bearing roller insertion method.

[0044] Figure 12 This is a longitudinal section view of a traditional self-aligning roller bearing with an insert groove.

[0045] Figure 13 From Figure 12The arrow view around the insertion slot is observed in the direction of arrow B. Detailed Implementation

[0046] [First Implementation Method]

[0047] Combination Figures 1 to 3B The roller bearing according to an embodiment of the present invention will be described. The roller bearing is suitable for applications such as the main shaft of a wind power generation device, industrial machinery, and vehicles, but is not limited to these applications. The following description also includes a description of the roller bearing assembly method.

[0048] <Integral Structure of Self-Aligning Roller Bearings>

[0049] like Figure 1 As shown, a self-aligning roller bearing is used as the roller bearing 1 according to this embodiment. The self-aligning roller bearing includes an inner ring 2, an outer ring 3, two rows of rollers 4, 4 disposed between the track surfaces 2a, 2b, 3a of the inner ring 2 and the outer ring 3, and retainers 5L, 5R with pockets Pt formed to retain the rollers 4, 4.

[0050] Two rows of rollers 4, 4 are arranged axially between the inner ring 2 and the outer ring 3. The track surface 3a of the outer ring 3 is concave spherical. The self-aligning roller bearing has self-aligning properties, meaning that the inner ring assembly As, including the inner ring 2, rollers 4, 4, and retainers 5L, 5R, can be relatively aligned with the outer ring 3. Through this self-aligning property, the self-aligning roller bearing can automatically adjust for bending and misalignment of the shaft Sh and the housing (not shown). Self-aligning roller bearings are sometimes simply referred to as roller bearings.

[0051] In this specification, "axial" refers to the direction along or parallel to the axis AX of the roller bearing 1. The direction perpendicular to the axis AX is called "radial," and the circumferential direction around the axis AX is called "circumferential direction." The side facing the axis AX is called the "inner diameter side," and the side away from the axis AX is called the "outer diameter side."

[0052] The first embodiment is an example of a self-aligning roller bearing with symmetrical left and right rows, where the contact angles θ1 and θ2 of the left and right rows are the same. The terms "left" and "right" in this specification are merely for convenience in indicating the relative positional relationship of the roller bearing 1 in the axial direction. In this specification, for ease of understanding, "left" and "right" are consistent with the left and right in the figures.

[0053] The outer circumferential surfaces of the left and right rollers 4 are shaped to match the track surface 3a of the outer ring 3. Specifically, the outer circumferential surfaces of the left and right rollers 4 are curved surfaces of revolution, formed by rotating an arc along the track surface 3a of the outer ring 3 around the center lines C1 and C2. The inner ring 2 has two rows of track surfaces 2a and 2b, whose cross-sectional shapes match the outer circumferential surfaces of the left and right rollers 4. The outer circumferential surfaces of the inner ring 2 have flanges 6, 6 (described later) at both axial ends. A central flange 7 is provided at the center of the outer circumferential surfaces of the inner ring 2, between the two track surfaces 2a and 2b. The flange 6 is also called the small flange 6. A radially penetrating lubricating oil supply hole 8 is formed at the axial center of the outer ring 3.

[0054] Each row of rollers 4, inner ring 2, and outer ring 3 is made of an iron-based material. As the iron-based material, any commonly used steel can be used, such as high-carbon chromium bearing steel, carbon steel, tool steel, martensitic stainless steel, carburized steel, etc.

[0055] <Retainer>

[0056] Cages 5L and 5R are pocket shapes that are open on one side (outer side) of the axial direction. In self-aligning roller bearings, when an inner ring 2 with small flanges 6, 6 is used, cages 5L and 5R with a pocket shape that is open on one side of the axial direction are used. Cages 5L and 5R have the same structure that is symmetrical on both sides. Cages 5L and 5R are, for example, so-called stamped cages made of copper alloy, synthetic resin, etc., through machining.

[0057] The retainer 5L for the left column has an annular portion 14 and a column portion 15. The column portion 15 protrudes axially to one side (left side) at multiple positions in the circumferential direction of the annular portion 14. A pocket Pt is formed between adjacent column portions 15, 15 and the annular portion 14 in the circumferential direction. The roller 4 of the left column is held in the pocket Pt.

[0058] The post portion 15 of the retainer 5R for the right column protrudes axially to the other side (right side) at multiple positions in the circumferential direction of the annular portion 14. For the retainer 5R for the right column, pockets Pt are also formed between adjacent post portions 15, 15 and the annular portion 14, and the rollers 4 of the right column are held in the pockets Pt.

[0059] The rollers 4 in both the left and right columns are asymmetrical rollers, with their maximum diameters D1max and D2max located M1 and M2 respectively, offset from the center of the roller length. In the left column of rollers 4, the maximum diameter D1max is located to the right of the roller length center A1, while in the right column of rollers 4, the maximum diameter D2max is located to the left of the roller length center A2. This asymmetrical roller configuration in the left and right columns generates induced thrust loads.

[0060] To withstand the induced thrust load, the inner ring 2 is provided with the central flange 7. Because the combination of two rows of rollers 4, 4, composed of asymmetrical rollers, and the central flange 7 guides the rollers 4, 4, 4 at three positions: the inner ring 2, the outer ring 3, and the central flange 7, the guiding accuracy is high. The rollers 4 can also be symmetrical rollers with their maximum diameter located at the center of their length. If such symmetrical rollers are used, the central flange 7 of the inner ring 2 can be omitted.

[0061] <About the flange>

[0062] like Figure 2 As shown, the inner edge portion 9 of the flange portion 6 is provided with a chamfer Cf. Figure 2 The example shows flange 6 for the right column, while flange 6 for the left column ( Figure 1 The flange portion 6 used in the right column has the same structure that is symmetrical from left to right, so detailed description is omitted. The inner edge portion 9 of the flange portion 6 refers to the outer peripheral surface 6a of the flange portion 6 and the track surface 2b of the inner ring 2 in the flange portion 6. Figure 1 :2a) The boundary portion between the axial inner surfaces 6b of the connection, i.e. the axial inner edge portion.

[0063] The flange portion 6 is connected to the shaft AX (containing the roller bearing 1). Figure 1 ) observed by cutting through an imaginary plane Figure 2 In the longitudinal section, the bevel dimension (straight-line dimension) L1 of the chamfer Cf is greater than 1 mm and less than 5 mm. In this example, the chamfer Cf uses a C-shaped chamfer (beveled chamfer), but it is not limited to a C-shaped chamfer. The axial dimension and radial dimension of the chamfer Cf can also be different.

[0064] In the longitudinal section, a flat portion 16 extending axially is provided on the radial circumferential surface, i.e., the outer circumferential surface 6a, of the flange portion 6. Furthermore, a flat portion 17 is provided on the axially inner surface 6b of the flange portion 6 in the same longitudinal section. This flat portion 17 has an inclination angle that slightly slopes axially outward as it extends radially outward. The axially outer edge portion Cfa of the chamfer Cf smoothly connects to the flat portion 16 provided on the radial circumferential surface of the flange portion 6, and the axially inner edge portion Cfb of the chamfer Cf smoothly connects to the flat portion 17 provided on the axially inner surface 6b of the flange portion 6.

[0065] The track surface 2b is connected to the flat portion 17 of the axial inner surface 6b via an annular retraction portion 18. The term "smooth connection" means that there are no steep points at the connection between the chamfer Cf and the flat portions 16 and 17, and that the surface pressure acting on the roller during roller insertion is below a specified value. This specified value can be appropriately set through testing or simulation. Furthermore, a specified chamfer 19 is formed at the boundary between the outer peripheral surface 6a of the flange portion 6 and the axial outer surface 2c of the inner ring 2.

[0066] Assembly Method

[0067] like Figure 3A As shown, first, the retainers 5L and 5R are installed on the outer periphery of the inner ring 2. Then, for any one of the left and right rows, the roller 4 is inserted into the designated track surface 2b (2a) of the inner ring 2. At this time, the roller 4 needs to be inserted axially inward, passing over the outer peripheral surface 6a of the flange portion 6 of the inner ring 2. When the roller 4 is inserted into the inner ring 2, the flat portion 16 of the radial peripheral surface of the flange portion 6 and the inclined surface of the chamfer Cf of the flange portion 6 will make sliding contact with the rolling surface 4b of the roller 4.

[0068] like Figure 3B As shown, when roller 4 is housed in the pocket Pt of retainer 5R, the chamfered surface Cf of flange 6 will slide into contact with the rolling surface 4b of roller 4, and simultaneously, the outer peripheral surface 4c of the front end of roller 4 in the insertion direction will slide into contact with the track surface 2b (2a). After inserting the first row of rollers 4, the remaining row of rollers 4 is inserted into the inner ring 2 in the same manner as described above. Thus, the inner ring assembly As, including inner ring 2, rollers 4, 4 and retainers 5L, 5R, is assembled. Then, as... Figure 1 As shown, the inner ring assembly As and the outer ring 3 are aligned with each other while being assembled, thereby completing the assembly of the self-aligning roller bearing.

[0069] <Effects>

[0070] According to the above description of the self-aligning roller bearing, in the longitudinal section, the chamfered surface dimension L1 of the chamfer Cf is ( Figure 2 The setting is 1mm or more and 5mm or less. Therefore, as... Figure 3A As shown, when the roller 4 is inserted axially into the inner ring 2 having the flange 6, the flat portion 16 of the radial circumferential surface of the flange 6 and the inclined surface of the chamfer Cf of the flange 6 will make sliding contact with the rolling surface 4b of the roller 4. Figure 3B As shown, when the roller 4 is housed in the pocket Pt of the retainer 5R, the chamfered surface Cf of the flange 6 will slide in contact with the rolling surface 4b of the roller 4, and simultaneously, the outer peripheral surface 4c of the front end of the roller 4 in the insertion direction will slide in contact with the track surface 2b. Due to the chamfered surface dimension L1 of the chamfered surface Cf... Figure 2 The thickness is between 1mm and 5mm, so especially when the chamfered surface Cf slides into contact with the rolling surface 4b of the roller 4, the surface pressure acting on the roller 4 can be reduced compared to the conventional structure. Therefore, compared to the conventional structure, stress concentration on the roller 4 can be reduced.

[0071] Therefore, compared with the traditional structure, the force required to insert the roller 4 (insertion force) can be reduced, allowing the roller 4 to be inserted smoothly. Thus, compared with the traditional structure, assembly performance can be improved. When the inclined plane dimension L1 ( Figure 2 When the slope L1 is less than 1mm, the effect of reducing the surface pressure acting on roller 4 is poor. Figure 2 When the size exceeds 5mm, it increases the number of processing steps, leading to higher manufacturing costs. Additionally, in Figure 2 In the longitudinal section shown, by having flat portions 16 and 17 on the radial circumferential surface 6a and the axial inner surface 6b of the flange portion 6 respectively, the rigidity of the flange portion 6 can be ensured, and the shape of the flange portion 6 can be prevented from undergoing unexpected plastic deformation in advance.

[0072] The outer axial edge Cfa of the chamfer Cf is connected to the flat portion 16 provided on the radial circumferential surface 6a of the flange portion 6, and the inner axial edge Cfb of the chamfer Cf is connected to the flat portion 17 provided on the inner axial surface 6b of the flange portion 6. Therefore, the flange portion 6 can be easily formed without the need for a special grinding wheel or similar equipment. Thus, compared to conventional structures, manufacturing costs can be further reduced.

[0073] Figure 1 The retainers 5L and 5R are pocket-shaped with axial single-sided opening. Each retainer 5L and 5R has an annular portion 14 and column portions 15 protruding axially at multiple positions along the circumference of the annular portion 14. A pocket Pt is formed between adjacent column portions 15 and the annular portion 14 in the circumferential direction. Therefore, when the axially single-sided open retainers 5L and 5R are inserted into the inner ring 2 with the flange portion 6, the roller 4 can be smoothly inserted.

[0074] <Regarding other implementation methods>

[0075] In the following description, the parts corresponding to the matters previously described in each embodiment will be marked with the same reference numerals, and repeated descriptions will be omitted. When only a part of the structure is described, the other parts of the structure are the same as in the previously described embodiments unless otherwise stated. The same structure has the same effect. Not only can the parts specifically described in each embodiment be combined, but embodiments can also be partially combined as long as there are no particular obstacles to the combination.

[0076] [Second Embodiment: Self-aligning roller bearing with insertion groove] Figures 4 to 6 ]

[0077] like Figure 4 As shown, the self-aligning roller bearing of the second embodiment has an insertion groove 11 for inserting rollers on the flange portion 6 of the inner ring 2. Figure 5As shown, the insertion groove 11 is provided on a portion of the outer peripheral surface 6a of the flange portion 6 in the circumferential direction. This insertion groove 11 is a recess with an arc-shaped cross-section extending axially, designed to facilitate the axial insertion of the roller 4. Figure 4 The groove bottom of the insertion groove 11 is formed to be lower radially inward than the outer peripheral surface 6a of the flange portion 6. The roller 4 is inserted through the insertion groove 11. Figure 4 When inserting roller 4 into the pocket Pt ( Figure 4 It is consistent with the phase (circumferential position) of the insertion slot 11.

[0078] like Figure 6 As shown, the inner edge 12 of the insertion groove 11 is provided with a chamfer Cf. The inner edge 12 of the insertion groove 11 refers to the boundary portion between the radial circumferential surface (i.e., the outer circumferential surface 11a) of the insertion groove 11 and the axial inner surface 6b of the flange portion 6 that connects to the track surface 2b, which is the axial inner edge portion. The flange portion 6 is connected to the shaft AX (containing the roller bearing 1) Figure 4 ) observed by cutting through an imaginary plane Figure 6 In the longitudinal section, the bevel dimension (straight dimension) L1 of the chamfer Cf is 1 mm or more and 5 mm or less. In the longitudinal section, a flat portion 16 extending axially is provided on the radial circumferential surface 11a of the bottom of the insertion groove 11. Furthermore, in the longitudinal section, a flat portion 17 is provided on the axially inner surface 6b of the flange portion 6. This flat portion 17 has an inclination angle that is slightly inclined axially outward as it extends radially outward.

[0079] The outer axial edge Cfa of the chamfer Cf is smoothly connected to the flat portion 16 provided on the radial circumferential surface 11a of the groove bottom, and the inner axial edge Cfb of the chamfer Cf is smoothly connected to the flat portion 17 provided on the inner axial surface 6b of the flange portion 6. The flat portion 17 of the inner axial surface 6b is connected to the track surface 2b through an annular retraction portion 18. The term "smoothly connected" means that there is no steep tip at the connection between the chamfer Cf and the flat portions 16 and 17, and the surface pressure acting on the roller when the roller is inserted is below a specified value.

[0080] according to Figure 4 This type of self-aligning roller bearing with insertion grooves, such as Figure 6 As shown, since the chamfer dimension L1 of the chamfer Cf is set to be between 1mm and 5mm, especially when inserting rollers, when the chamfer Cf is in contact with... Figure 4When the rolling surface 4b of the roller 4 shown slides in contact, the surface pressure acting on the roller 4 can be reduced compared to the conventional structure. Therefore, compared to the conventional structure, stress concentration on the roller 4 can be reduced. Consequently, compared to the conventional structure, the insertion force of the roller 4 can be reduced, allowing the roller 4 to be inserted smoothly. Therefore, compared to the conventional structure, assembly performance can be improved. In addition, it can achieve the same effects as the aforementioned embodiment.

[0081] [Third implementation method: Double row cylindrical roller bearing,] Figures 7 to 8 ]

[0082] like Figure 7 As shown, the roller bearing 1 according to the third embodiment can also be a double-row cylindrical roller bearing without insertion grooves. Each roller 4 is a cylindrical roller. In the third embodiment, flange portions 6, 6 are provided at both axial ends of the inner circumferential surface of the outer ring 3.

[0083] like Figure 8 As shown, the inner edge 9 of the flange portion 6 is provided with a chamfer Cf. The flange portion 6 is then fitted with a roller bearing 1 (…). Figure 7 ) is observed by cutting through an imaginary plane at the axis of the ) Figure 8 In the longitudinal section, the bevel dimension (straight dimension) L1 of the chamfer Cf is 1 mm or more and 5 mm or less. In the longitudinal section, a flat portion 16 extending axially is provided on the radial circumferential surface 6a (i.e., the inner circumferential surface) of the flange portion 6. Furthermore, in the longitudinal section, a flat portion 17 is provided on the axial inner surface 6b of the flange portion 6. Figure 7 The roller bearing 1 shown according to the third embodiment can also perform roughly the same function as the first embodiment.

[0084] [Fourth embodiment: Single-row cylindrical roller bearing with insertion groove,] Figures 9 to 10 ]

[0085] like Figure 9 As shown, the roller bearing 1 according to the fourth embodiment can also be a single-row cylindrical roller bearing with an insertion groove 11. In the fourth embodiment, flange portions 6, 6 are provided at both axial ends of the inner circumferential surface of the outer ring 3. At least one side of the flange portion 6, 6 at both axial ends has an insertion groove 11 for inserting a roller. In other words, on the open side of the retainer 5... Figure 9 An insertion groove 11 is provided on the flange portion 6 on the left side.

[0086] like Figure 10 As shown, the inner edge 12 of the insertion groove 11 is provided with a chamfer Cf. The flange 6 is then fitted with a roller bearing 1 (…). Figure 9 ) is observed by cutting through an imaginary plane at the axis of the ) Figure 10In the longitudinal section, the bevel dimension (straight-line dimension) L1 of the chamfer Cf is 1 mm or more and 5 mm or less. In the longitudinal section, a flat portion 16 extending axially is provided on the radial circumferential surface 11a of the bottom of the insertion groove 11. Furthermore, in the longitudinal section, a flat portion 17 is provided on the axial inner surface 6b of the flange portion 6. Therefore, this embodiment can achieve the same effect as the second embodiment with the insertion groove.

[0087] The retainer can be formed by injection molding using a mold, or it can be formed using a 3D printer, etc.

[0088] As described above, preferred embodiments have been illustrated with reference to the accompanying drawings. However, various additions, modifications, and deletions can be made without departing from the spirit of this invention. Therefore, such modifications are also included within the scope of this invention.

[0089] [Symbol Explanation]

[0090] 1…roller bearings

[0091] 2…Inner circle

[0092] 3…outer ring

[0093] 4…roller

[0094] 5, 5L, 5R… retainer

[0095] 6…Flange

[0096] 9…Inner edge

[0097] 11… Insertion slot

[0098] 14… Circular section

[0099] 15…Column

[0100] 16, 17... Flat sections

[0101] Cf…edge beveling

[0102] Cfa…Axial outer edge

[0103] Cfb…Axial inner edge

[0104] Pt… pocket.

Claims

1. A roller bearing comprising an inner ring, an outer ring, a plurality of rollers disposed between the inner ring and the outer ring, and a retainer for retaining the rollers, wherein the inner ring or the outer ring has a flange at an axial end, characterized in that, The flange portion has a chamfer on its inner edge. In a cross-section observed by cutting the flange portion with an imaginary plane containing the axis of the roller bearing, the size of the chamfer's bevel is 1 mm or more and 5 mm or less. Furthermore, in the cross-section, the radial circumferential surface and the axial inner surface of the flange portion each have a flat portion.

2. The roller bearing according to claim 1, characterized in that, The flange has an insertion groove for inserting a roller, and the inner edge of the insertion groove is provided with a chamfer. On the cross-section, the flat portion is respectively provided on the radial circumferential surface of the bottom of the insertion groove and the axial inner surface of the flange.

3. The roller bearing according to claim 1, characterized in that, The outer axial edge of the chamfer is connected to the flat portion provided on the radial circumferential surface of the flange, and the inner axial edge of the chamfer is connected to the flat portion provided on the inner axial surface of the flange.

4. The roller bearing according to claim 2, characterized in that, The outer axial edge of the chamfer is connected to the flat portion provided on the radial circumferential surface of the groove bottom, and the inner axial edge of the chamfer is connected to the flat portion provided on the inner axial surface of the flange.

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