Roller bearing

Abstract

To provide a roller bearing having a flange part and an interposing groove part which are shaped to improve the insertion property of rollers while reducing force required to insert the rollers.SOLUTION: The roller bearing includes an inner ring, an outer ring, the plurality of rollers provided between the inner ring and the outer ring, and a cage for rollably holding the rollers, and has the flange part at the axial end of the inner ring or the outer ring. On the inside edge of the flange part, a roller chamfer is provided. The axial size of the roller chamfer is 2%-5% to the radius of the flange side end face of the roller.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a roller bearing, and particularly to the shape of a flange portion that allows easier insertion of rollers.

Background Art

[0002] Conventionally, when incorporating rollers into a roller bearing provided with a cage having open axial ends, the rollers were inserted with the outer peripheral surface of the tip end portion of the roller in contact with both column portions of the cage and the outer peripheral surface of the rear end portion of the roller in contact with the flange portion of the outer ring or inner ring. In such a case, there is a risk of indentations and scratches on the raceway surface. To avoid this, generally, a receiving groove for inserting the roller is provided, or in the case of a bearing without a receiving groove, the height of the flange portion is reduced. In Patent Document 1, in order to prevent indentations and scratches on the raceway surface, the surface in contact with the roller in the roller insertion jig is made an inclined surface to prevent the roller from contacting the raceway surface during insertion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Although the above method can avoid indentations and scratches on the raceway surface, there are problems in the assembly aspect, such as the force required for inserting the roller increases and it becomes difficult to insert because the inner edge portion of the flange portion or the inner edge portion of the receiving groove and the rolling surface of the roller come into contact.

[0005] Therefore, an object of the present invention is to provide a shape of a flange portion and a receiving groove portion that can reduce the force required for inserting a roller and improve the insertability of the roller in a roller bearing in which the roller is inserted in a state of contacting the inner edge portion of the flange portion at the axial end of the bearing raceway ring or the inner edge portion of the receiving groove of the flange portion.

Means for Solving the Problem

[0006] The roller bearing according to the present invention includes an inner ring, an outer ring, a plurality of rollers provided between the inner ring and the outer ring, and a cage for rotatably holding the rollers. It is a roller bearing having a flange portion at an axial end of the inner ring or the outer ring, a chamfer is provided on an inner edge portion of the flange portion, and an axial dimension of the chamfer is 2% or more and 5% or less with respect to a radius of an end face on the flange side of the roller.

[0007] The "flange portion" is a flange-shaped portion that prevents the roller from falling off the inner ring or the outer ring. When the "flange portion" is provided at an axial end of the inner ring, this "flange portion" is integrally provided at the axial end of the inner ring so as to protrude outward in the radial direction by a predetermined length at the axial end of the inner ring. The "integrally provided" means that the axial end of the inner ring and the flange portion are not formed by combining a plurality of elements, but are formed as a part or the whole of a single object from a single material, for example, by forging, machining, etc. When the "flange portion" is provided at an axial end of the outer ring, this "flange portion" is integrally provided at the axial end of the outer ring so as to protrude inward in the radial direction by a predetermined length at the axial end of the outer ring.

[0008] The "inner edge portion" refers to an edge portion on the inner side in the axial direction of the flange portion. In other words, the "inner edge portion" refers to a boundary portion between the circumferential surface of the flange portion and the inner side surface in the axial direction that is connected to the raceway surface of the flange portion. When the "flange portion" is provided at an axial end of the inner ring, the "inner edge portion" refers to a boundary portion between the outer circumferential surface of the flange portion and the inner side surface in the axial direction that is connected to the inner ring raceway surface of the flange portion. When the "flange portion" is provided at an axial end of the outer ring, the "inner edge portion" refers to a boundary portion between the inner circumferential surface of the flange portion and the inner side surface in the axial direction that is connected to the outer ring raceway surface of the flange portion.

[0009] According to this configuration, in the roller bearing, by setting the axial dimension of the chamfer at the inner edge portion of the flange portion to be 2% or more and 5% or less with respect to the radius of the flange side end face of the roller, the chamfered portion smoothly guides the roller during roller insertion. Therefore, the force required for roller insertion can be reduced, and the insertability of the roller can be improved.

[0010] Further, the roller bearing according to the present invention includes an inner ring, an outer ring, a plurality of rollers provided between the inner ring and the outer ring, and a cage that rotatably holds the rollers. It is a roller bearing having a flange portion at an axial end of the inner ring or the outer ring, wherein the flange portion has an insertion groove for inserting the roller, a chamfer is provided at the inner edge portion of the insertion groove, and the axial dimension of the chamfer is 2% or more and 5% or less with respect to the radius of the flange side end face of the roller.

[0011] The "insertion groove" is a recess, for example, having an arcuate cross section, provided on the outer diameter surface or the inner diameter surface of the flange portion, and extending in the axial direction by the thickness of the flange portion. When the "flange portion" is provided at the axial end of the inner ring, the "insertion groove" is provided on the outer diameter surface of this flange portion. When the "flange portion" is provided at the axial end of the outer ring, the "insertion groove" is provided on the inner diameter surface of this flange portion.

[0012] According to this configuration, in a roller bearing having an insertion groove in the flange portion, by setting the axial dimension of the chamfer at the inner edge portion of the insertion groove to be 2% or more and 5% or less with respect to the radius of the flange side end face of the roller, the chamfered portion smoothly guides the roller during roller insertion. Therefore, the force required for roller insertion can be reduced, and the insertability of the roller can be improved. Further, since the chamfer only needs to be provided at the inner edge portion of the insertion groove, the processing range can be reduced, and the cost can be suppressed.

[0013] When a chamfer is provided on the inner edge portion of the flange portion, the R surface formed by the chamfer in the flange portion may be connected to the radial end surface of the flange portion such that the radial end surface of the flange portion extends in the tangential direction at the connection portion with the R surface. According to this configuration, since the R surface of the flange portion and the radial end surface are smoothly connected, the roller can be inserted smoothly, and the insertability of the roller can be further improved.

[0014] Similarly, when a chamfer is provided on the inner edge portion of the receiving groove, the R surface formed by the chamfer in the receiving groove may be connected to the radial end surface of the receiving groove such that the radial end surface of the receiving groove extends in the tangential direction at the connection portion with the R surface. According to this configuration, since the R surface of the receiving groove and the radial end surface are smoothly connected, the roller can be inserted smoothly, and the insertability of the roller can be further improved.

[0015] The roller bearing of the present invention may be a tapered roller bearing or a cylindrical roller bearing. Also, the number of rows of rollers in the bearing may be single row, double row, etc.

Effect of the Invention

[0016] According to the shapes of the flange portion and the receiving groove of the roller bearing according to the present invention, the force required for inserting the roller can be reduced, and the insertability of the roller can be improved.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

[0018] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. It should be noted that the drawings are not necessarily drawn to an exact scale, and it should be understood that in order to make the configuration according to the present invention easier to understand, the components may be emphasized in the drawings. In the following description, the axial direction of the central axis of the spherical bearing is referred to as the "axial direction", the radial direction of the spherical bearing is referred to as the "radial direction", and the circumferential direction around the central axis of the spherical bearing is referred to as the "circumferential direction".

[0019] <First Embodiment> The spherical bearing 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 2. This embodiment is an example applied to a double-row self-aligning spherical bearing without a receiving groove. The spherical bearing 1 shown in FIG. 1 includes an inner ring 2, an outer ring 3, a plurality of rollers 4 interposed between the raceway surfaces 2a and 3a of the inner ring 2 and the outer ring 3, and a cage 5 that rotatably holds the rollers 4. The plurality of rollers 4 are arranged in two rows side by side in the bearing width direction (axial direction). Each roller 4 is in a sagging shape. Flanges (small flanges) 6 are respectively provided at the axial ends of the outer peripheral surface of the inner ring 2. A middle flange 7 is provided at the central portion of the outer peripheral surface of the inner ring 2, that is, between the two rows of raceway surfaces 2a, 2a. The raceway surface 3a of the outer ring 3 is spherical. The outer ring 3 has a lubricant supply hole 8 that penetrates the outer ring 3. The spherical bearing 1 is configured such that the rollers 4 are inserted over the small flanges 6 of the inner ring 2 during assembly.

[0020] In the roller bearing 1, as shown in FIG. 2, 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 round 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 surface of the small flange 6, and the raceway surface side end surface 6b, which is the axial end surface facing the raceway surface 2a, that is, the axial inner edge portion. The axial dimension L1 of the chamfer on the inner edge portion 9 of the small flange 6 is 2% or more and 5% or less with respect to the radius r (FIG. 1) of the flange side end surface 4a of the roller 4. 0.02 ≤ L1 / r ≤ 0.05 The axial dimension L1 of the chamfer on 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 raceway surface side end surface 6b to the connection portion 10 where the inner edge portion 9 of the small flange 6 is connected to the outer diameter surface 6a. The radius r of the flange side end surface 4a of the roller 4 refers to the radius of the end surface 4a on the side of the roller 4 facing the small flange 6. When the axial dimension L1 of the chamfer on the inner edge portion 9 is less than 2% with respect to the radius r of the flange side end surface 4a of the roller 4, the range of the chamfer is too small, and the effect of facilitating the insertion of the roller cannot be sufficiently obtained. When it exceeds 5%, the range of the chamfer becomes large and the axial dimension of the flange becomes large, so there is a risk that the roller may easily come off during the handling of the bearing.

[0021] Furthermore, in the roller bearing 1, when viewed in 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 such that the outer diameter surface 6a of the small flange 6 extends in the tangential direction at the connection portion 10 with the R surface.

[0022] According to this configuration, as described above, when inserting the roller, the chamfered portion of the inner edge portion 9 smoothly guides the roller 4, so that the roller 4 can be inserted with less force and the insertability of the roller can be improved. In addition, at the portion where the R surface formed by the chamfer and the outer diameter surface 6a of the small flange 6 are connected, the outer diameter surface 6a extends along the tangential direction of the R surface, so that the R surface and the outer diameter surface 6a are smoothly connected, and the roller 4 can be inserted smoothly, further improving the insertability of the roller.

[0023] <Regarding other embodiments, etc.> In the following description, parts corresponding to matters described in advance in each embodiment are given the same reference numerals, and duplicate descriptions are omitted. When only a part of the configuration is described, the other parts of the configuration are the same as those in the embodiments described in advance unless otherwise specified. The same configuration exhibits the same effects. It is possible not only to combine the parts specifically described in each embodiment, but also to partially combine the embodiments with each other as long as there is no problem with the combination.

[0024] <Second Embodiment> The roller bearing 1 according to the second embodiment of the present invention will be described with reference to FIGS. 3 to 5. This embodiment is an example applied to a double-row self-aligning roller bearing having receiving grooves. The roller bearing 1 of this embodiment has the same configuration as the roller bearing 1 of the first embodiment, except that the collar (small collar) 6 has a receiving groove 11 for inserting the rollers. The receiving groove 11 is a concave portion having a cross-sectional arc shape that extends in the axial direction and is provided on the outer diameter surface 6a of the small collar 6 as shown in FIG. 4, and is for facilitating the insertion of the rollers from the axial direction. The height of the receiving groove 11 is lower than the height of the outer diameter surface 6a of the small collar 6.

[0025] In the roller bearing 1, as shown in FIG. 5, chamfers are provided on the inner edge portion 12 of the receiving groove 11. The chamfer on the inner edge portion 12 of the receiving groove 11 is a round chamfer. Here, the inner edge portion 12 of the receiving groove 11 refers to the boundary portion between the outer diameter surface 11a, which is the radial end face of the receiving groove 11, and the end face 6b on the raceway surface side of the small collar 6, that is, the inner edge portion in the axial direction. The axial dimension L2 of the chamfer on the inner edge portion 12 of the receiving groove 11 is 2% or more and 5% or less with respect to the radius r (FIG. 3) of the end face 4a on the collar side of the roller 4. 0.02 ≦ L2 / r ≦ 0.05 The axial dimension L2 of the chamfer at the inner edge portion 12 of the insertion groove 11 refers to the length in the axial direction from the intersection point P2 of the extension line of the outer diameter surface 11a of the insertion groove 11 and the extension line of the end face 6b on the raceway surface side of the small flange 6 at the position of the bottom of the insertion groove 11 to the connection portion 13 where the inner edge portion 12 of the insertion groove 11 connects to the outer diameter surface 11a. Also, 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 insertion groove 11 is connected to the outer diameter surface 11a of the insertion groove 11 such that the outer diameter surface 11a of the insertion groove 11 extends in the tangential direction at the connection portion 13 of the R surface.

[0026] Also in the roller bearing in which the roller is inserted from the insertion groove 11 in FIG. 3, by setting the axial dimension L2 of the chamfer at the inner edge portion 12 of the insertion groove 11 in FIG. 5 to be 2% or more and 5% or less with respect to the radius r of the side end face 4a of the flange of the roller 4, the same effect as in the first embodiment can be obtained. That is, since the chamfered portion of the inner edge portion 12 smoothly guides the roller 4 during roller insertion, the roller 4 can be inserted with less force, improving the insertability of the roller. In addition, since the outer diameter surface 11a extends along the tangential direction of the R surface at the portion where the R surface formed by the chamfer in the insertion groove 11 and the outer diameter surface 11a are connected, the R surface and the outer diameter surface 11a are smoothly connected, so that the roller 4 can be inserted smoothly, further improving the insertability of the roller. Furthermore, since the chamfer only needs to be provided on the inner edge portion 12 of the insertion groove 11, the processing range can be reduced and the cost can be suppressed.

[0027] <Third Embodiment> The roller bearing 1 according to the third embodiment of the present invention shown in FIG. 6 is an example applied to a double-row cylindrical roller bearing without raceways. The roller bearing 1 includes an inner ring 2, an outer ring 3, a plurality of rollers 4 interposed between the raceway surfaces 2a and 3a of the inner ring 2 and the outer ring 3, and a cage 5 that rotatably holds the rollers 4. Each roller 4 is cylindrical. The plurality of rollers 4 are arranged in two rows side by side in the bearing width direction (axial direction). Flanges (small flanges) 6 are respectively provided at the axial ends of the inner peripheral surface of the outer ring 3. A middle flange 7 is provided at the central portion of the outer peripheral surface of the outer ring 3, that is, between the two rows of rollers 4. The outer ring 3 has a lubricant supply hole 8 that penetrates the outer ring 3. The roller bearing 1 is configured to insert the rollers 4 over the small flanges 6 of the outer ring 3 during assembly.

[0028] Also in the roller bearing 1 of the third embodiment, similar to the first embodiment, chamfers are provided at the inner edge portions 9 of the small flanges 6 in FIG. 7. However, in the present embodiment, the small flanges 6 are provided on the outer ring 3, and the inner edge portion 9 of the small flange 6 refers to the boundary portion between the inner diameter surface 6a, which is the radial end surface of the small flange 6, and the raceway surface side end surface 6b, which is the axial end surface facing the raceway surface, that is, the axially inner edge portion. The ratio of the axial dimension L1 of the chamfer at the inner edge portion 9 of the small flange 6 and the shape of the connecting portion between the R surface of the small flange 6 and the inner diameter surface 6a are the same as those in the first embodiment, and the same effects are achieved.

[0029] <Fourth Embodiment> The roller bearing 1 according to the fourth embodiment of the present invention shown in FIG. 8 is an example applied to a single-row cylindrical roller bearing having raceways. The roller bearing 1 of the present embodiment includes an inner ring 2, an outer ring 3, a plurality of rollers 4 provided in a single row in the circumferential direction between the raceway surfaces 2a and 3a of the inner ring 2 and the outer ring 3, and a cage 5 that rotatably holds the rollers 4. Each roller 4 is cylindrical. Flanges (small flanges) 6 are respectively provided at the axial ends of the inner peripheral surface of the outer ring 3. Similar to the second embodiment, the roller bearing 1 of the present embodiment has raceway grooves 11 for inserting rollers in the small flanges 6.

[0030] Also in the roller bearing 1 of the present embodiment, chamfers are provided on the inner edge portion 12 of the receiving groove 11, as in the second embodiment (Fig. 9). However, in the present embodiment, the small flange 6 is provided on the outer ring 3, and the inner edge portion 12 of the receiving groove 11 refers to the boundary portion between the inner diameter surface 11a of the receiving groove 11 and the end face 6b on the raceway surface side of the small flange 6. The ratio of the axial dimension L2 of the chamfer at the inner edge portion 12 of the receiving groove 11 and the shape of the connecting portion between the R surface of the receiving groove 11 and the inner diameter surface 11a are the same as those in the second embodiment, and the same effects are obtained.

[0031] As described above, the mode for carrying out the present invention has been described based on the embodiments. However, the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims are included.

Description of Reference Numerals

[0032] 1... roller bearing, 2... inner ring, 3... outer ring, 4... roller, 4a... end face on the flange side of the roller, 5... cage, 6... small flange, 9... inner edge portion of the small flange, 10... connecting portion of the small flange chamfer, 11... receiving groove, 12... inner edge portion of the receiving groove, 13... connecting portion of the receiving groove chamfer

Claims

1. An antifriction bearing comprising an inner ring, an outer ring, a plurality of rolling elements provided between the inner ring and the outer ring, and a cage for rotatably holding the rolling elements, wherein the antifriction bearing has a flange portion at an axial end of the inner ring or the outer ring, a chamfer is provided at an inner edge portion of the flange portion, and an axial dimension of the chamfer is 2% or more and 5% or less with respect to a radius of a flange-side end face of the rolling element.

2. An antifriction bearing comprising an inner ring, an outer ring, a plurality of rolling elements provided between the inner ring and the outer ring, and a cage for rotatably holding the rolling elements, wherein the antifriction bearing has a flange portion at an axial end of the inner ring or the outer ring, the flange portion has a groove for inserting the rolling element, a chamfer is provided at an inner edge portion of the groove, and an axial dimension of the chamfer is 2% or more and 5% or less with respect to a radius of a flange-side end face of the rolling element.

3. The antifriction bearing according to claim 1, wherein an R surface formed by the chamfer in the flange portion is connected to a radial end face of the flange portion such that the radial end face of the flange portion extends in a tangential direction at a connection portion with the R surface.

4. The antifriction bearing according to claim 2, wherein an R surface formed by the chamfer in the groove is connected to a radial end face of the groove such that the radial end face of the groove extends in a tangential direction at a connection portion with the R surface.

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