JP2014001800A - Bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device that can be stably mounted to a target component.SOLUTION: The bearing device 10 includes: an inner race 11 having an inner race-extracting part 20 at one end thereof in a direction of axis of rotation; an outer race 12; and a rolling element 13. The inner race-extracting part 20 includes an inner race-extracting groove 21 formed toward a radially inner side from a surface on a radially outer side. The bearing device 10 satisfies d≤dwhere ddenotes an inner raceway diameter and ddenotes an extracting groove diameter that is a diameter in a position of the bottom of the inner race-extracting groove. Thus, the bearing device 10 can be stably mounted to a target component.

Description

  The present invention relates to a bearing device.

  As a bearing device, there is a rolling bearing. The rolling bearing has an inner ring, an outer ring, and a rolling element, and the inner ring and the outer ring rotate via the rolling element. Among such bearing devices, there is a bearing device having an extraction portion in an inner ring (for example, Patent Document 1). The drawing portion is formed with a groove into which a tool is fitted when the bearing device is removed.

JP 2009-9568 A

  When a bearing device having a pull-out portion is mounted on a target component such as a shaft, the bearing device may become unstable or deform.

  An object of this invention is to provide the bearing apparatus which can be stably mounted | worn to a target component, when providing a drawing-out part.

The present invention includes an inner ring having an inner ring extraction portion at one end in the rotation axis direction, an outer ring, and a rolling element, and the inner ring extraction portion is directed radially inward from a radially outer surface. has formed inner ring pull grooves, an inner ring raceway diameter as d _1, the withdrawal groove diameter is the diameter at the position of the bottom of the inner ring pull grooves and d _2, characterized in that the d ₂ ≦ d ₁ This is a bearing device.

In this bearing device, by setting d ₂ ≦ d ₁ , it is possible to suppress the load applied to the surface on which the extraction portion is formed by the pushing jig that supports the bearing device from being applied to the raceway surface of the inner ring. Thereby, a deformation | transformation of an inner ring | wheel can be suppressed and it can mount | wear with the target components stably.

In the bearing device, it is preferable that d ₂ ≧ (d ₁ + D ₁ ) / 2, where D ₁ is an inner ring inner diameter of the inner ring. This bearing device can apply a load applied to the inner ring with a more appropriate distribution, and can be stably mounted on a target component.

In the bearing device, it is preferable that d ₂ = (d ₁ + D ₁ ) / 2 when the inner ring inner diameter of the inner ring is D ₁ . This bearing device can apply a load applied to the inner ring with a more appropriate distribution, and can be stably mounted on a target component.

Further, the outer ring includes an outer ring extraction portion at one end in the rotation axis direction, and the outer ring extraction portion has an outer ring extraction groove formed from a radially inner surface toward a radially outer side, outer pull grooves, the outer ring raceway diameter as d _3, the withdrawal groove diameter is the diameter at the position of the bottom of the outer pull grooves and d _4, it is preferable that d ₃ ≦ d _4.

In this bearing device, by setting d ₃ ≦ d ₄ , it is possible to suppress the load applied to the surface on which the extraction portion is formed by the pushing jig that supports the bearing device from being applied to the raceway surface of the outer ring. Thereby, a deformation | transformation of an outer ring | wheel can be suppressed and it can mount | wear to the target components stably.

The present invention includes an inner ring, an outer ring having an outer ring extraction portion at one end in the rotation axis direction, and a rolling element, and the outer ring extraction portion is directed radially outward from a radially inner surface. has formed an outer ring pull grooves, the outer pull grooves, the outer ring raceway diameter as d _3, the pull groove diameter is the diameter at the position of the bottom of the outer pull grooves When d _4, d ₃ ≦ d ₄ is a bearing device.

In this bearing device, by setting d ₃ ≦ d ₄ , it is possible to suppress the load applied to the surface on which the extraction portion is formed by the pushing jig that supports the bearing device from being applied to the raceway surface of the outer ring. Thereby, a deformation | transformation of an outer ring | wheel can be suppressed and it can mount | wear to the target components stably.

In the bearing device, it is preferable that d ₄ ≦ (d ₃ + D ₂ ) / 2 when the outer ring outer diameter of the outer ring is D ₂ . This bearing device can apply the load applied to the outer ring with a more appropriate distribution, and can be stably mounted on the target component.

In the bearing device, it is preferable that d ₄ = (d ₃ + D ₂ ) / 2 when the outer diameter of the outer ring is D ₂ . This bearing device can apply the load applied to the outer ring with a more appropriate distribution, and can be stably mounted on the target component.

  The present invention can provide a bearing device that can be stably mounted on a target component.

FIG. 1 is a partial cross-sectional view illustrating a state in which the bearing device according to the first embodiment is assembled to a target member. FIG. 2 is a partial cross-sectional view illustrating the bearing device according to the first embodiment. FIG. 3 is an explanatory view for explaining the operation during assembly of the bearing device according to the first embodiment. FIG. 4 is a partial cross-sectional view schematically showing a load applied to the inner ring of the bearing device according to the first embodiment. FIG. 5 is a partial cross-sectional view schematically showing a load applied to the inner ring of the bearing device according to the comparative example. FIG. 6 is an explanatory view illustrating a state when the bearing device according to the comparative example is assembled. FIG. 7 is a partial cross-sectional view showing a bearing device according to a modification of the first embodiment. FIG. 8 is a partial cross-sectional view showing the bearing device according to the second embodiment. FIG. 9 is a partial cross-sectional view showing a bearing device according to a modification of the second embodiment.

  Hereinafter, modes for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a partial cross-sectional view illustrating a state in which the bearing device according to the first embodiment is assembled to a target member. FIG. 2 is a partial cross-sectional view illustrating the bearing device according to the first embodiment. 1 and 2 are partial cross-sectional views illustrating the bearing device according to the first embodiment. The bearing device 10 is a ball bearing. The bearing device 10 includes an inner ring 11, an outer ring 12 arranged on the radially outer side of the inner ring 11, and balls 13 as a plurality of rolling elements arranged between the inner ring 11 and the outer ring 12. The plurality of balls 13 are held by a cage (retainer) 14. In the inner ring 11, a raceway surface 15 formed on the radially outer surface contacts the ball 13. In the outer ring 12, a raceway surface 16 formed on a radially inner surface contacts the ball 13. The raceway surfaces 15 and 16 are concave curved surfaces with respect to the ball 13. The bearing device 10 sandwiches a ball 13 between an inner ring 11 and an outer ring 12. Further, the balls 13 are in contact with the raceway surface 15 of the inner ring 11 and the raceway surface 16 of the outer ring 12 in a rotatable state. Thus, in the bearing device 10, the inner ring 11 and the outer ring 12 can rotate about the rotation shaft (the center in the radial direction of the inner ring 11 and the outer ring 12). In the present embodiment, the bearing device 10 is a radial ball bearing. The bearing device 10 may be a radial ball bearing, and may be an angular ball bearing or a deep groove ball bearing. The angular ball bearing is preferable because it can be used with a higher load because the number of balls 13 is large.

  The bearing device 10 is attached to the shaft 2. The shaft 2 is, for example, a main shaft of a machine tool such as a machining center or a lathe, but the target to which the bearing device 10 is attached is not limited to this. In the bearing device 10, one end portion of the inner ring 11 abuts on a step (large diameter portion) 30 that protrudes radially outward of the shaft 2. The shaft 2 has a notch 32 formed at a corner formed by an end portion on the radially inner side of the step 30, that is, a surface formed by contacting the step 30 and the radially inner surface of the inner ring 11. The shaft 2 can make the corner of the inner ring 11 and the shaft 2 non-contact by providing the notch 32.

  The inner ring 11 of the bearing device 10 is provided with an inner ring extraction portion 20 on the surface opposite to the surface on the step 30 side in the axial direction. The inner ring extraction portion 20 protrudes in the axial direction, and an inner ring extraction groove 21 is formed. The inner ring pull-out groove 21 is a groove (concave portion) formed from the radially outer surface of the inner ring pull-out portion 20 toward the radially inner side. The inner ring drawing groove 21 is formed at a position exposed to the outside.

  The bearing device 10 is attached to the shaft 2, and the spacer 4 is attached to the surface on the side opposite to the step 32 of the inner ring 11, on the side where the inner ring pull-out portion 20 is provided. In this state, the fastening nut 5 is screwed into the shaft 2 from the side opposite to the bearing device 10 of the spacer 4. As described above, in the bearing device 10, one end portion of the inner ring 11 is in contact with the large diameter portion of the shaft 2. For this reason, when the tightening nut 5 is screwed into the shaft 2 and tightened, the movement of the bearing device 10 in the axial direction (direction of the rotation center axis Zr) is restricted and fixed to the shaft 2.

  The shaft 2 to which the bearing device 10 is attached is attached via the bearing device 10 to a housing 3 (for example, a housing such as a machine tool) to which the shaft 2 is attached. In the bearing device 10, each outer ring 12 is attached to a bearing attachment portion of the housing 3. At this time, one end portion of the outer ring 12 of the bearing device 10 abuts on a step (small diameter portion) protruding radially inward of the bearing mounting portion.

  When the bearing device 10 is removed from the state where it is mounted on the shaft 2, a tool is fitted into the inner ring extraction groove 21 of the inner ring extraction portion 20, and is pulled from the step 30 to the inner ring extraction portion 20 side. The bearing device 10 can be pulled with a large force in a direction away from the step 30 by being pulled by a tool fitted in the inner ring extraction groove 21 of the inner ring extraction portion 20, and the bearing device 10 can be easily detached from the shaft 2. .

Here, as shown in FIG. 2, in the bearing device 10, d ₂ ≦ d ₁ where the inner ring raceway diameter is d ₁ and the drawing groove diameter which is the position of the bottom is d ₂ . Here, the inner ring raceway diameter is the radial distance of the innermost position in the radial direction of the raceway surface 15 of the inner ring 11. Further, the drawing groove diameter is the distance in the radial direction at the innermost position in the radial direction of the inner ring drawing groove 21.

  FIG. 3 is an explanatory view for explaining the operation during assembly of the bearing device according to the first embodiment. FIG. 4 is a partial cross-sectional view schematically showing a load applied to the inner ring of the bearing device according to the first embodiment. FIG. 5 is a partial cross-sectional view schematically showing a load applied to the inner ring of the bearing device according to the comparative example. FIG. 6 is an explanatory view illustrating a state when the bearing device according to the comparative example is assembled.

  As shown in FIG. 3, the bearing device 10 is inserted into the shaft 2 as step S <b> 1 and pushes the end surface of the inner ring pull-out portion 20 from the direction indicated by the arrow 34 to move it to the step 30. As a result, the bearing device 10 is moved to a position where the surface of the inner ring 11 opposite to the inner ring pull-out portion 20 side contacts the step 30 as shown in step S2. Thereafter, in the bearing device 10, the spacer 4 shown in FIG. 1 is disposed on the end surface of the inner ring pull-out portion 20. Thereafter, when the tightening nut 5 is screwed into the shaft 2, the bearing device 10 is sandwiched between the spacer 4 and the step 30, and the position in the axial direction is fixed.

Here, the bearing device 10 is pushed in by the pushing jig 44 when being pushed into the shaft 2 in step S1. As a result, the inner ring 11 of the bearing device 10 is pressed in the direction of the step 30 by the pressing jig 44. In the bearing device 10 of the present embodiment, the load applied by the pushing jig 44 is applied to the region 38. Specifically, the load is applied to a portion radially inward of the inner ring pulling groove 21. As described above, since the bearing device 10 satisfies d ₂ ≦ d ₁ , the raceway surface 15 is disposed on the radially outer side than the inner ring pull-out groove 21. Thereby, the raceway surface 15 does not overlap the region 38 to which the load applied by the pushing jig 44 is applied. Thereby, the bearing apparatus 10 can suppress that the raceway surface 15 deform | transforms with the load added with the pushing jig | tool 44, and can receive the load concerning an inner ring | wheel stably with an inner ring | wheel.

For example, the inner ring 111 of the bearing device 110 shown as a comparative example has a raceway surface 115 and an inner ring pull-out portion 120 as in the case of the inner ring 11. The inner ring extraction portion 120 is formed with an inner ring extraction groove 121. Here, the inner ring 111, an inner ring raceway diameter as _{d 11,} a pull groove diameter is the position of the bottom when the _{d 21,} a _{d 21>} d _11. In the bearing device 110, the load applied by the pushing jig 44 is applied to the region 138. Specifically, the load is applied to a portion radially inward of the inner ring pulling groove 121. As described above, since the bearing device 110 satisfies d ₂₁ > d ₁₁ , a part of the raceway surface 115 is disposed radially inward of the inner ring pulling groove 121. As a result, the raceway surface 115 partially overlaps the region 138 to which the load applied by the pushing jig 44 is applied. The bearing device 110 is subjected to a load applied by the pushing jig 44 on the raceway surface 115 which does not have a backup to receive the load, that is, the member to which the load is not applied has a member. For this reason, as shown in FIG. 6, the bearing device 110 is deformed in a direction in which the outer diameter side surface of the inner ring 111 falls on the raceway surface 115. In the bearing device 110, when the pushing jig 44 is inclined with respect to the inner ring 111 or when the dimensional error of the pushing jig 44 is large, the inner ring 111 is deformed more greatly.

  As described above, the bearing device 10, like the bearing device 110, can suppress the deformation of the inner ring 11, thereby suppressing the raceway surface 15 from being deformed and damaging the balls 13 that are rolling elements. it can. Thereby, the bearing apparatus 10 can be stably mounted on the target component.

Further, in the bearing device 10, when the inner ring inner diameter of the inner ring 11 is D ₁ as shown in FIG. 2, it is preferable that d ₂ ≧ (d ₁ + D ₁ ) / 2. In the bearing device 10, the drawing groove diameter d ₂ is equal to or equal to the bisector where the distance between the inner ring inner diameter D ₁ and the inner ring raceway diameter d ₁ in the radial direction, that is, the distance between both is a. It is preferable to adopt a configuration that is arranged radially outside the branch line. Further, the bearing device 10 is d ₂ = (d ₁ + D ₁ ) / 2, that is, the drawing groove diameter d ₂ is set at the same position as the bisector where the distance between them is a. More preferably. By setting d ₂ ≧ (d ₁ + D ₁ ) / 2, the bearing device 10 can have a more appropriate relationship between the inner ring pull-out groove and the raceway surface of the inner ring, and can stabilize the load applied to the inner ring. And can be stably mounted on the target component (shaft or housing). By setting d ₂ = (d ₁ + D ₁ ) / 2, the bearing device 10 can make the position of the inner ring pull-out groove and the race surface of the inner ring more appropriate, and stabilize the load applied to the inner ring. And can be stably attached to the target part.

  Here, in the bearing device 10, the inner ring 11 is provided with the inner ring extraction portion 20 and the inner ring extraction groove 21, but the present invention is not limited thereto. The bearing device 10 may be provided with a similar mechanism on the outer ring 12.

  FIG. 7 is a partial cross-sectional view showing a bearing device according to a modification of the first embodiment. Hereinafter, a modification of the bearing device 10 will be described with reference to FIG. The modified example shown in FIG. 7 is different from the bearing device 10 in that the outer ring includes the outer ring extraction portion 40 and the outer ring extraction groove 41. Others are the same as the bearing apparatus 10. In the following, the same parts as those of the bearing device 10 described above will be described with the same reference numerals.

  The bearing device 10a is a ball bearing. The bearing device 10a includes an inner ring 11, an outer ring 12a disposed on the radially outer side of the inner ring 11, and balls 13 as a plurality of rolling elements disposed between the inner ring 11 and the outer ring 12a. The plurality of balls 13 are held by a cage (retainer) 14. In the inner ring 11, a raceway surface 15 formed on the radially outer surface contacts the ball 13. In the outer ring 12 a, the raceway surface 16 formed on the radially inner surface contacts the ball 13. The raceway surfaces 15 and 16 are concave curved surfaces with respect to the ball 13. The bearing device 10a sandwiches the ball 13 between the inner ring 11 and the outer ring 12a. Further, the balls 13 are in contact with the raceway surface 15 of the inner ring 11 and the raceway surface 16 of the outer ring 12a in a rotatable state. Thus, in the bearing device 10a, the inner ring 11 and the outer ring 12a can rotate about the rotation shaft (the center in the radial direction of the inner ring 11 and the outer ring 12a).

  The outer ring 12a of the bearing device 10a is provided with an outer ring extraction portion 40 on the surface on the side where the inner ring extraction portion 20 is provided in the axial direction. The outer ring extraction portion 40 protrudes in the axial direction, and an outer ring extraction groove 41 is formed. The outer ring extraction groove 41 is a groove (concave portion) formed from the radially inner surface of the outer ring extraction portion 40 toward the radially outer side. The outer ring pull-out groove 41 is formed at a position exposed to the outside.

The bearing device 10a, the outer ring raceway diameter as shown in FIG. 7 and d _3, when the pull groove diameter is the position of the bottom and d _4, a d ₃ ≦ d _4. Here, the outer ring raceway diameter is the radial distance of the outermost position in the radial direction of the raceway surface 16 of the outer ring 12a. Further, the drawing groove diameter is a distance in the radial direction at the outermost position in the radial direction of the outer ring drawing groove 41.

Here, in the bearing device 10 a, when a load is applied to the outer ring 12 a by the pushing jig, the load applied by the pushing jig is applied to a portion on the radially outer side than the outer ring pulling groove 41. As described above, since the bearing device 10 a satisfies d ₃ ≦ d ₄ , the raceway surface 16 is disposed radially inward from the outer ring pull-out groove 41. As a result, the bearing device 10a is applied by the pushing jig even when the outer ring 12a is loaded by the pushing jig, that is, when the outer ring 12a is pushed and the radial position is supported at a predetermined position by a step. The region where the applied load is applied and the raceway surface 16 can be prevented from overlapping. Thereby, the bearing device 10a can suppress the deformation of the raceway surface 16 due to the load applied by the pushing jig, and can stably receive the load applied to the outer ring at the outer ring. As described above, the bearing device 10a can prevent the raceway surface 16 from being deformed and damaging the balls 13 that are rolling elements. Thereby, the bearing apparatus 10a can also be stably mounted on the target component.

Further, in the bearing device 10a, it is preferable that d ₄ ≦ (d ₃ + D ₂ ) / 2 when the outer diameter of the outer ring 12a is D ₂ as shown in FIG. The bearing device 10a, pulling groove diameter d ₄ is the midpoint in the radial direction of the outer ring outside diameter D ₂ and the outer ring raceway diameter d _3, that is, the same or the bisector of the distance between them becomes b two It is preferable to adopt a configuration that is arranged on the inner side in the radial direction than the bisector. Further, the bearing device 10a sets d ₄ = (d ₃ + D ₂ ) / 2, that is, the drawing groove diameter d ₄ is positioned at the same position as the bisector where the distance between them is b. More preferably. By setting d ₄ ≦ (d ₃ + D ₂ ) / 2 in the bearing device 10a, the position of the outer ring drawing groove and the raceway surface of the outer ring can be more appropriately related, and the load applied to the outer ring can be stabilized. And can be stably mounted on the target component (shaft or housing). By setting d ₄ = (d ₃ + D ₂ ) / 2 in the bearing device 10a, the position of the outer ring pull-out groove and the raceway surface of the outer ring can be more appropriately related, and the load applied to the outer ring can be stabilized. And can be stably attached to the target part.

(Embodiment 2)
FIG. 8 is a partial cross-sectional view showing the bearing device according to the second embodiment. The second embodiment is different from the first embodiment in that the bearing device is a roller bearing. Others are the same as in the first embodiment. In the following, the same parts as those in the first embodiment will be described with the same reference numerals.

  A bearing device 210 shown in FIG. 8 uses rollers 213 as rolling elements. The bearing device 210 is a roller bearing. The bearing device 210 includes an inner ring 211, an outer ring 212 disposed on the radially outer side of the inner ring 211, and a plurality of rollers 213 as rolling elements disposed between the inner ring 211 and the outer ring 212. In the inner ring 211, the raceway surface 215 formed on the radially outer surface contacts the roller 213. In the outer ring 212, a raceway surface 216 formed on a radially inner surface contacts the roller 213. The raceway surfaces 215 and 216 are recessed portions that are recessed with respect to the rollers 213. The bearing device 210 sandwiches the roller 213 between the inner ring 211 and the outer ring 212. The rollers 213 are in contact with the raceway surface 215 of the inner ring 211 and the raceway surface 216 of the outer ring 212 in a rotatable state with respect to an axis parallel to the rotation center axis Zr. Thereby, in the bearing device 210, the inner ring 211 and the outer ring 212 can rotate about the rotation shaft (the center in the radial direction of the inner ring 211 and the outer ring 212).

Here, the bearing device 210, similar to the bearings 10, the inner ring raceway diameter and _{d 1a,} a pull groove diameter is the position of the bottom when the _{d 2a,} a _{d 2a} ≦ _{d 1a.} Here, the inner ring raceway diameter is the radial distance of the innermost position in the radial direction of the raceway surface 215 of the inner ring 211. Further, the drawing groove diameter is the distance in the radial direction at the innermost position in the radial direction of the inner ring drawing groove 221. Similarly to the bearing device 10, the bearing device 210 can be stably attached to the target component by _satisfying d _2a ≦ d _1a . Thus, the same effect can be obtained also when the bearing device 210 is a roller bearing.

Similarly to the bearing device 10, the bearing device 210 preferably satisfies d _2a ≧ (d _1a + D _1a ) / 2 when the inner ring inner diameter of the inner ring 211 is D _1a . The bearing device 210 is more preferably d _2a = (d _1a + D _1a ) / 2. By setting d _2a ≧ (d _1a + D _1a ) / 2, the bearing device 210 can have a more appropriate relationship between the inner ring pull-out groove and the raceway surface of the inner ring, and can stabilize the load applied to the inner ring. And can be stably mounted on the target component (shaft or housing). By setting d _2a = (d _1a + D _1a ) / 2, the bearing device 210 can make the position of the inner ring pull-out groove and the race surface of the inner ring more appropriate, and stabilize the load applied to the inner ring. And can be stably attached to the target part.

  Here, in the bearing device 210, the inner ring 211 is provided with the inner ring extraction portion 220 and the inner ring extraction groove 221. However, the present invention is not limited to this. The bearing device 210 may be provided with the same mechanism in the outer ring 212 as in the bearing device 10a.

  FIG. 9 is a partial cross-sectional view showing a bearing device according to a modification of the second embodiment. Hereinafter, a modification of the bearing device 210 will be described with reference to FIG. The modification shown in FIG. 9 is different from the bearing device 210 in that the outer ring includes an outer ring extraction portion 240 and an outer ring extraction groove 241. Others are the same as the bearing device 210. In the following, the same parts as those of the above-described bearing device 210 will be described with the same reference numerals.

  The bearing device 210a is a roller bearing. The bearing device 210a includes an inner ring 211, an outer ring 212a disposed on the radially outer side of the inner ring 211, and a plurality of rollers 213 as rolling elements disposed between the inner ring 211 and the outer ring 212a. In the inner ring 211, the raceway surface 215 formed on the radially outer surface contacts the roller 213. In the outer ring 212 a, the raceway surface 216 formed on the radially inner surface contacts the roller 213. The raceway surfaces 215 and 216 are recessed portions that are recessed with respect to the rollers 213. The bearing device 210a sandwiches the roller 213 between the inner ring 211 and the outer ring 212a. The rollers 213 are in contact with the raceway surface 215 of the inner ring 211 and the raceway surface 216 of the outer ring 212a in a rotatable state with respect to an axis parallel to the rotation center axis Zr. Thus, in the bearing device 210a, the inner ring 211 and the outer ring 212a can rotate about the rotation shaft (the radial center of the inner ring 211 and the outer ring 212a).

  The outer ring 212a of the bearing device 210a is provided with an outer ring extraction part 240 on the surface on the side where the inner ring extraction part 220 is provided in the axial direction. The outer ring extraction portion 240 protrudes in the axial direction, and an outer ring extraction groove 241 is formed. The outer ring extraction groove 241 is a groove (concave portion) formed from the radially inner surface of the outer ring extraction portion 240 toward the radially outer side. The outer ring extraction groove 241 is formed at a position exposed to the outside.

Bearing device 210a is the outer ring raceway diameter as shown in FIG. 9 and _{d 3a,} a pull groove diameter is the position of the bottom when the _{d 4a,} a _{d 3a} ≦ _{d 4a.} Here, the outer ring raceway diameter is the radial distance at the outermost position in the radial direction of the raceway surface 216 of the outer ring 212a. Further, the drawing groove diameter is a distance in the radial direction at the outermost position in the radial direction of the outer ring drawing groove 241.

Here, in the bearing device 210a, when a load is applied to the outer ring 212a by the push-in jig, the load applied by the push-in jig is applied to a portion on the radially outer side than the outer ring pull-out groove 241. As described above, since the bearing device 210a satisfies d _3a ≦ d _4a , the raceway surface 216 is disposed on the radially inner side with respect to the outer ring extraction groove 241. As a result, the bearing device 210a can be added by the pushing jig even when the outer ring 212a is loaded by the pushing jig, that is, when the outer ring 212a is pushed by the jig or the radial position is supported by a step. The region where the applied load is applied and the raceway surface 216 can be prevented from overlapping. Thereby, the bearing device 210a can suppress the deformation of the raceway surface 216 due to the load applied by the pushing jig, and can stably receive the load applied to the outer ring at the outer ring. As described above, the bearing device 210a can prevent the raceway surface 216 from being deformed and damaging the rollers 213 that are rolling elements. Thereby, the bearing apparatus 210a can also be stably mounted on the target component.

The bearing device 210a, when the _{D 2a} the outer ring outer diameter of the outer ring 212a as shown in FIG. _9, it is preferable that the _{d 4a ≦ (d 3a + D} 2a) / 2. The bearing device 210a is more preferably d _4a = (d _3a + D _2a ) / 2. By setting d _4a ≦ (d _3a + D _2a ) / 2, the bearing device 210a can have a more appropriate relationship between the outer ring pull-out groove and the raceway surface of the outer ring, and can stabilize the load applied to the outer ring. And can be stably mounted on the target component (shaft or housing). By setting d _4a = (d _3a + D _2a ) / 2, the bearing device 210a can make the position of the outer ring pull-out groove and the raceway surface of the outer ring more appropriate, and stabilize the load applied to the outer ring. And can be stably attached to the target part.

  As mentioned above, although Embodiment 1 and Embodiment 2 were demonstrated, these embodiment is not limited to the content mentioned above. In addition, the constituent elements in the first and second embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. In addition, various omissions, substitutions, or changes of the components of each embodiment can be made without departing from the gist of the first embodiment and the second embodiment.

2 Shaft 3 Housing 4 Spacer 5 Clamping nut 10, 10a Bearing device 11 Inner ring 12, 12a Outer ring 13 Ball (rolling element)
14 Cage (Retainer)
15, 16 Raceway surface 20 Inner ring extraction portion 21 Inner ring extraction groove 30 Step 32 Notch 40 Outer ring extraction portion 41 Outer ring extraction groove

Claims (7)

An inner ring having an inner ring extraction portion at one end in the direction of the rotation axis, an outer ring, and a rolling element;
The inner ring extraction part has an inner ring extraction groove formed from the radially outer surface toward the radially inner side,
An inner ring raceway diameter as d _1, the pull groove diameter is the diameter at the position of the bottom of the inner ring pull grooves When d _2, the bearing device, characterized in that the d ₂ ≦ d _1. 2. The bearing device according to claim 1, wherein d ₂ ≧ (d ₁ + D ₁ ) / 2 when the inner ring inner diameter of the inner ring is D ₁ . 2. The bearing device according to claim 1, wherein d ₂ = (d ₁ + D ₁ ) / 2 when the inner ring inner diameter of the inner ring is D ₁ . The outer ring includes an outer ring extraction part at one end in the rotation axis direction,
The outer ring extraction portion has an outer ring extraction groove formed from the radially inner surface toward the radially outer side,
Claim wherein the outer ring pull grooves, the outer ring raceway diameter as d _3, the withdrawal groove diameter is the diameter at the position of the bottom of the outer pull grooves and d _4, which characterized by a d ₃ ≦ d ₄ to The bearing device according to any one of 1 to 3. An outer ring having an inner ring, an outer ring having an outer ring extraction portion at one end in the rotation axis direction, and a rolling element, the outer ring extraction portion being formed from a radially inner surface toward a radially outer side. Having a groove,
The outer ring pull grooves, the outer ring raceway diameter as d _3, the diameter at which the withdrawal groove diameter at the position of the bottom of the outer pull grooves and d _4, the bearing device which is a d ₃ ≦ d ₄ . The bearing device according to claim 5, wherein d ₄ ≦ (d ₃ + D ₂ ) / 2, where D ₂ is an outer diameter of the outer ring. 6. The bearing device according to claim 5, wherein d ₄ = (d ₃ + D ₂ ) / 2 when the outer diameter of the outer ring is D ₂ .

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