Roller bearing

Abstract

[Problem] To provide a roller bearing that provides shapes of a flange portion and a groove portion, that can reduce the force required to insert a roller, and that can improve the insertability of the roller. [Solution] A roller bearing includes an inner ring, an outer ring, a plurality of rollers provided between the inner ring and the outer ring, and a cage that holds the rollers in a rolling manner. The roller bearing has a flange portion at an axial end of the inner ring or the outer ring. The inner edge of the flange portion is provided with a chamfer, and the axial dimension of the chamfer is 2% or more and 5% or less of the radius of the flange-side end face of the roller.

Description

Technical Field

[0001] This utility model relates to roller bearings, and more particularly to a shape that allows for easier insertion of the flange portion of the roller. Background Technology

[0002] Traditionally, when assembling rollers into roller bearings with axially open retainers, the rollers are inserted with the outer circumferential surface of the front end in contact with the two pillars of the retainer, and the outer circumferential surface of the rear end in contact with the flange of the outer or inner ring. In this case, dents or scratches may be left on the track surface. To avoid this, grooves for roller insertion are generally provided, or the height of the flange is reduced for bearings without grooves. In JP Patent Application Publication 2005-344848, to prevent dents or scratches on the track surface, the surface in contact with the roller in the insertion fixture is made inclined to prevent the roller from contacting the track surface during insertion. Utility Model Content

[0003] [Problem to be solved by the utility model]

[0004] The above method can avoid leaving dents or scratches on the track surface. However, because the inner edge of the flange or the inner edge of the groove abuts against the rolling surface of the roller, there are assembly problems, such as the increased force required to insert the roller, making it difficult to insert.

[0005] Therefore, the purpose of this utility model is to provide a shape for the flange and the groove, which reduces the force required to insert the roller and improves the insertion performance of the roller when the roller is inserted into a roller bearing in a state where the roller is in contact with the inner edge of the flange or the inner edge of the groove at the axial end of the bearing track wheel.

[0006] [Technical solution used to solve the problem]

[0007] The roller bearing of this invention 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 in a rolling manner.

[0008] The inner ring or the outer ring has a flange at its axial end.

[0009] A chamfer is provided on the inner edge of the flange portion.

[0010] The axial dimension of the chamfer is more than 2% and less than 5% of the radius of the flange side end face of the roller.

[0011] The "flange portion" is a flange-shaped part that prevents the roller from falling off the inner or outer ring. When a "flange portion" is provided at the axial end of the inner ring, it is integrally provided at the axial end of the inner ring, protruding radially outward by a predetermined length. "Integrally provided" means that the axial end of the inner ring and the flange portion are not formed by combining multiple elements, but rather are formed from a single material as part or integral to a single object through methods such as forging or machining.

[0012] When a "flange" is provided at the axial end of the outer ring, the "flange" is integrally provided at the axial end of the outer ring such that it protrudes radially inward by a predetermined length at the axial end of the outer ring.

[0013] 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 portion of the flange portion that connects to the track surface.

[0014] When a "flange portion" is provided at the axial end of the inner ring, the "inner edge portion" refers to the boundary portion between the outer peripheral surface of the flange portion and the axial inner surface of the flange portion that is connected to the inner ring track surface.

[0015] When a "flange portion" is provided at the axial end of the outer ring, the "inner edge portion" refers to the boundary portion between the inner circumferential surface of the flange portion and the axial inner surface of the flange portion that is connected to the outer ring track surface.

[0016] According to this structure, in a roller bearing, by setting the axial dimension of the chamfer of the inner edge of the flange portion to 2% to 5% of the radius of the flange side end face of the roller, the chamfer portion smoothly guides the roller when it is inserted, thus reducing the force required to insert the roller and improving the insertion performance of the roller.

[0017] In addition, 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 that holds the rollers in a rolling manner.

[0018] The inner ring or the outer ring has a flange at its axial end.

[0019] The flange portion has a groove for roller insertion.

[0020] A chamfer is provided on the inner edge of the groove.

[0021] The axial dimension of the chamfer is more than 2% and less than 5% of the radius of the flange side end face of the roller.

[0022] The "groove" is a recess, for example, with an arc-shaped cross-section, provided on the outer or inner diameter surface of the flange portion, extending along the axial direction by the thickness of the flange portion. When a "flange portion" is provided at the axial end of the inner ring, the "groove" is provided on the outer diameter surface of that flange portion. When a "flange portion" is provided at the axial end of the outer ring, the "groove" is provided on the inner diameter surface of that flange portion.

[0023] According to this structure, in roller bearings with grooves on the flange portion, by setting the axial dimension of the chamfer on the inner edge of the groove to 2% to 5% of the radius of the flange side end face of the roller, the chamfer smoothly guides the roller during insertion, thus reducing the force required for roller insertion and improving roller insertion performance. Furthermore, since the chamfer is only required on the inner edge of the groove, the machining area can be reduced, thus controlling costs.

[0024] When a chamfer is provided on the inner edge of the flange portion, the R-face formed by the chamfer in the flange portion can also be connected to the radial end face of the flange portion in such a way that the radial end face of the flange portion extends along the tangential direction at the connection with the R-face. According to this structure, the R-face of the flange portion is smoothly connected to the radial end face, thus allowing for smooth insertion of the roller and further improving the roller's insertion performance.

[0025] Similarly, when a chamfer is provided on the inner edge of the groove, the R-face formed by the chamfer in the groove can also be connected to the radial end face of the groove in such a way that the radial end face of the groove extends along the tangential direction at the connection with the R-face. According to this structure, the R-face of the groove is smoothly connected to the radial end face, thus allowing the roller to be inserted smoothly and further improving the insertion performance of the roller.

[0026] The roller bearing of this invention can be a tapered roller bearing or a cylindrical roller bearing. Furthermore, the number of rows of rollers in the bearing can be single-row, multi-row, etc.

[0027] Note that this invention includes any combination of at least two components disclosed in the claims and / or description and / or drawings. In particular, any combination of two or more of the claims stated in the claims is included in this invention. Attached Figure Description

[0028] The present invention will be more clearly understood from 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 determined by the claims. In the drawings, the same part numbers in the plurality of drawings denote the same parts.

[0029] Figure 1 This is a longitudinal sectional view of the roller bearing according to the first embodiment of the present invention.

[0030] Figure 2 This is an enlarged longitudinal sectional view showing the details of the flange of the roller bearing.

[0031] Figure 3 This is a longitudinal sectional view showing the roller bearing of the second embodiment of the present invention.

[0032] Figure 4 It means from Figure 3 The arrow view of the groove when observing the direction of arrow A.

[0033] Figure 5 This is an enlarged longitudinal sectional view showing the details of the flange and groove of the roller bearing.

[0034] Figure 6 This is a longitudinal sectional view of the roller bearing according to the third embodiment of the present invention.

[0035] Figure 7 This is an enlarged longitudinal sectional view showing the details of the flange of the roller bearing.

[0036] Figure 8 This is a longitudinal sectional view of the roller bearing according to the fourth embodiment of the present invention.

[0037] Figure 9 This is an enlarged longitudinal sectional view showing the details of the flange and groove of the roller bearing. Detailed Implementation

[0038] The preferred embodiments of the present invention will now be described with reference to the accompanying drawings. It should be understood that the drawings are not necessarily to an exact scale; rather, some constituent elements are emphasized in the drawings to make the structure of the present invention easier to understand. In the following description, the axial direction of the central axis of the roller bearing is referred to as the "axial direction," the radial direction of the roller bearing is referred to as the "radial direction," and the circumferential direction around the central axis of the roller bearing is referred to as the "circumferential direction."

[0039] <First Implementation Method>

[0040] Combination Figures 1-2 This invention describes a first embodiment of a roller bearing 1. This embodiment is an example applicable to a multi-row self-aligning roller bearing without grooves. Figure 1The roller bearing 1 shown includes an inner ring 2, an outer ring 3, a plurality of rollers 4 between the raceways 2a and 3a of the inner ring 2 and the outer ring 3, and a retainer 5 for retaining the rollers 4 in a rolling manner. The plurality of rollers 4 are arranged side-by-side in two rows along the bearing width direction (axial direction). Each roller 4 is barrel-shaped. A flange (small flange) 6 is provided at the axial end of the outer circumferential surface of the inner ring 2. A middle flange 7 is provided at the center of the outer circumferential surface of the inner ring 2, i.e., between the raceways 2a and 2a of the two rows. The raceway 3a of the outer ring 3 is spherical. The outer ring 3 has a lubrication supply hole 8 that extends through the outer ring 3. The roller bearing 1 is configured such that the rollers 4 are inserted past the small flanges 6 of the inner ring 2 during assembly.

[0041] In roller bearing 1, as Figure 2 As shown, a chamfer is provided on the inner edge portion 9 of the small flange 6. The chamfer on the inner edge portion 9 of the small flange 6 is a rounded chamfer. Here, the inner edge portion 9 of the small flange 6 refers to the boundary portion between the outer diameter surface 6a, which is the radial end face of the small flange 6, and the track surface side end face 6b, which is the axial end face facing the track surface 2a, i.e., the axial inner edge portion. The axial dimension L1 of the chamfer at the inner edge portion 9 of the small flange 6 is the radius r of the flange side end face 4a of the roller 4. Figure 1 ) is between 2% and 5%.

[0042] 0.02≦L1 / r≦0.05

[0043] The axial dimension L1 of the chamfer of the inner edge portion 9 refers to the length in the axial direction from the intersection point P1 of the extension line of the outer diameter surface 6a of the small flange 6 and the extension line of the track surface side end face 6b to the connecting portion 10 where the inner edge portion 9 of the small flange 6 connects with the outer diameter surface 6a.

[0044] The radius r of the flange side end face 4a of roller 4 refers to the radius of the end face 4a facing the small flange 6 in roller 4.

[0045] When the axial dimension L1 of the chamfer on the inner edge 9 is less than 2% of the radius r of the flange side end face 4a of the roller 4, the chamfer range is too small, and the effect of easy roller insertion cannot be fully achieved. When it exceeds 5%, the chamfer range becomes larger, the axial dimension of the flange becomes larger, and therefore the roller may easily fall off when using the bearing.

[0046] Furthermore, in the roller bearing 1, when viewed from a longitudinal section along the axial direction, the R-surface formed by the chamfer of the inner edge portion 9 is connected to the outer diameter surface 6a of the small flange 6 in such a way that the outer diameter surface 6a of the small flange 6 extends along the tangential direction at the connection portion 10 with the R-surface.

[0047] According to this structure, as described above, since the chamfered portion of the inner edge 9 smoothly guides the roller 4 when the roller is inserted, in addition to being able to insert the roller 4 with less force and improving the insertion performance of the roller, the portion where the R-surface formed by the chamfer in the small flange 6 connects with the outer diameter surface 6a, the outer diameter surface 6a extends along the tangential direction of the R-surface, thereby the R-surface and the outer diameter surface 6a are smoothly connected, thus the roller 4 can be inserted smoothly, and the insertion performance of the roller can be further improved.

[0048] <Regarding other implementation methods, etc.>

[0049] In the following description, the same reference numerals are used to mark the parts corresponding to the matters described in each embodiment, and repeated descriptions are 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 specified. The same structure achieves the same effect. Not only combinations of the parts specifically described in each embodiment are possible, but embodiments can also be partially combined with each other if such combinations do not create obstacles.

[0050] <Second Implementation Method>

[0051] Combination Figures 3-5 This invention describes a second embodiment of the roller bearing 1. This embodiment is an example applicable to a multi-row self-aligning roller bearing with grooves. The roller bearing 1 of this embodiment has the same structure as the roller bearing 1 of the first embodiment, except that it has a groove 11 for roller insertion on the flange (small flange) 6. For example... Figure 4 As shown, the groove 11 is an arc-shaped recess on the outer diameter surface 6a of the small flange 6, extending axially, for easy axial insertion of the roller. The height of the groove 11 is lower than the height of the outer diameter surface 6a of the small flange 6.

[0052] In roller bearing 1, as Figure 5 As shown, a chamfer is provided on the inner edge 12 of the groove 11. The chamfer on the inner edge 12 of the groove 11 is a rounded chamfer. Here, the inner edge 12 of the groove 11 refers to the boundary portion between the outer diameter surface 11a of the radial end face of the groove 11 and the track surface side end face 6b of the small flange 6, that is, the axial inner edge portion. The axial dimension L2 of the chamfer on the inner edge 12 of the groove 11 is the radius r of the flange side end face 4a of the roller 4. Figure 3 ) is between 2% and 5%.

[0053] 0.02≦L² / r≦0.05

[0054] The axial dimension L2 of the chamfer of the inner edge portion 12 of the groove 11 refers to the axial length from the intersection point P2 of the extension line of the outer diameter surface 11a of the groove 11 and the extension line of the track surface side end face 6b of the small flange 6 at the bottom position of the groove 11 to the connecting portion 13 where the inner edge portion 12 of the groove 11 connects with the outer diameter surface 11a. Furthermore, similar to the chamfer in the first embodiment, when viewed in a longitudinal section along the axial direction, the R-surface formed by the chamfer in the groove 11 connects to the outer diameter surface 11a of the groove 11 in such a way that the outer diameter surface 11a of the groove 11 extends along the tangential direction at the connecting portion 13 of the R-surface.

[0055] Even from Figure 3 The groove 11 is inserted into the roller bearing of the roller, by... Figure 5 Setting the axial dimension L2 of the chamfer of the inner edge portion 12 of the groove 11 to be 2% to 5% of the radius r of the flange side end face 4a of the roller 4 also achieves the same effect as the first embodiment. That is, since the chamfer of the inner edge portion 12 smoothly guides the roller 4 when the roller is inserted, in addition to being able to insert the roller 4 with less force and improving the roller's insertability, the outer diameter surface 11a extends along the tangent direction of the R surface formed by the chamfer in the groove 11, thereby smoothly connecting the R surface and the outer diameter surface 11a, and thus being able to smoothly insert the roller 4, further improving the roller's insertability. Moreover, since the chamfer only needs to be provided on the inner edge portion 12 of the groove 11, the processing range can be reduced, and costs can be suppressed.

[0056] <Third Implementation Method>

[0057] Figure 6 The roller bearing 1 shown in the third embodiment of this utility model is an example applicable to a multi-row cylindrical roller bearing without grooves. The roller bearing 1 includes an inner ring 2, an outer ring 3, a plurality of rollers 4 between the raceway surfaces 2a and 3a of the inner ring 2 and the outer ring 3, and a retainer 5 for holding the rollers 4 in a rolling manner. Each roller 4 is cylindrical. The plurality of rollers 4 are arranged side-by-side in two rows along the bearing width direction (axial direction). A flange (small flange) 6 is provided at the axial end of the inner circumferential surface of the outer ring 3. A middle flange 7 is provided at the center of the outer circumferential surface of the outer ring 3, i.e., between the two rows of rollers 4. The outer ring 3 has a lubrication supply hole 8 penetrating the outer ring 3. The roller bearing 1 is configured such that the rollers 4 are inserted past the small flanges 6 of the outer ring 3 during assembly.

[0058] In the roller bearing 1 of the third embodiment, the same as in the first embodiment, in... Figure 7The inner edge 9 of the small flange 6 is chamfered. However, in this embodiment, the small flange 6 is provided on the outer ring 3, and the inner edge 9 of the small flange 6 refers to the boundary portion between the inner diameter surface 6a, which is the radial end face of the small flange 6, and the track surface side end face 6b, which is the axial end face facing the track surface, i.e., the axial inner edge portion. The ratio of the axial dimension L1 of the chamfer of the inner edge 9 of the small flange 6, and the shape of the connection portion between the R surface of the small flange 6 and the inner diameter surface 6a are the same as in the first embodiment, achieving the same effect.

[0059] <Fourth Implementation Method>

[0060] Figure 8 The roller bearing 1 of the fourth embodiment of this utility model shown is an example applicable to a single-row cylindrical roller bearing with grooves. The roller bearing 1 of this embodiment includes an inner ring 2, an outer ring 3, a plurality of rollers 4 arranged circumferentially in a single row between the track surfaces 2a and 3a of the inner ring 2 and the outer ring 3, and a retainer 5 for retaining the rollers 4 in a rolling manner. Each roller 4 is cylindrical. A flange (small flange) 6 is provided at the axial end of the inner circumferential surface of the outer ring 3. Similar to the second embodiment described above, the roller bearing 1 of this embodiment has a groove 11 for roller insertion on the small flange 6.

[0061] In the roller bearing 1 of this embodiment, similar to the second embodiment, a chamfer is provided on the inner edge 12 of the groove 11. Figure 9 However, in this embodiment, the small flange 6 is provided on the outer ring 3, and the inner edge portion 12 of the groove 11 refers to the boundary portion between the inner diameter surface 11a of the groove 11 and the track surface side end face 6b of the small flange 6. The ratio of the axial dimension L2 of the chamfer of the inner edge portion 12 of the groove 11, and the shape of the connection portion between the R surface of the groove 11 and the inner diameter surface 11a are the same as in the second embodiment, achieving the same effect.

[0062] The foregoing has described the methods for implementing this utility model based on the embodiments. However, the embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of this utility model is defined by the claims rather than the foregoing description, and is intended to include all modifications within the meaning and scope of the claims.

[0063] As described above, preferred embodiments of the present disclosure have been illustrated with reference to the accompanying drawings. However, various additions, modifications, or deletions can be made without departing from the spirit of the present disclosure. Therefore, these are also included within the scope of the present invention.

[0064] [Symbol Explanation]

[0065] 1…roller bearing, 2…inner ring, 3…outer ring, 4…roller, 4a…flange side end face of the roller, 5…cage, 6…small flange, 9…inner edge of the small flange, 10…connection of the chamfered small flange, 11…groove, 12…inner edge of the groove, 13…connection of the chamfered groove.

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 that retains the rollers in a rolling manner, characterized in that a flange portion is provided at an axial end portion of the inner ring or the outer ring, an inner side edge portion of the flange portion is provided with a chamfer, and an axial dimension of the chamfer is 2% or more and 5% or less of a radius of a flange side end surface of the roller.

2. The roller bearing according to claim 1, characterized in that a R surface formed by the chamfer in the flange portion is connected to a radial end surface of the flange portion in such a manner that the radial end surface of the flange portion extends along a tangent direction at a connecting portion of the R surface. In 3. 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 that retains the rollers in a rolling manner, characterized in that a flange portion is provided at an axial end portion of the inner ring or the outer ring, the flange portion has a groove for roller insertion, an inner side edge portion of the groove is provided with a chamfer, and an axial dimension of the chamfer is 2% or more and 5% or less of a radius of a flange side end surface of the roller.

4. The roller bearing according to claim 3, characterized in that a R surface formed by the chamfer in the groove is connected to a radial end surface of the groove in such a manner that the radial end surface of the groove extends along a tangent direction at a connecting portion of the R surface.

2. The roller bearing of claim 1, wherein, ​ ​ ​ ​ ​ ​ 4. The roller bearing of claim 3, wherein, ​

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