JP4225176B2 - Rolling bearing device - Google Patents

Description

  The present invention relates to a rolling bearing device used for supporting a wheel of a vehicle or the like.

In such a rolling bearing device, there is a type in which a flange portion for attaching a wheel is provided on an outer peripheral surface of an inner shaft disposed on the inner diameter side of an outer ring, and a disk rotor or a wheel is attached to an outer surface of the flange portion. And the attachment hole penetrated to the axial direction is provided in the circumferential direction several places of the flange part, and a volt | bolt is press-fitted in each of these attachment holes. A hole formed in the disk rotor or wheel is passed through the bolt press-fitted into the flange, and a nut is attached to the tip of the bolt protruding from the hole of the wheel, etc., to fix the disk rotor or wheel to the outer surface of the flange. (See Patent Document 1).
JP-A-11-151904

  In the above rolling bearing device, when the bolt breaks or the like, it is necessary to pull out the bolt from the flange portion of the inner shaft and remove it. However, conventionally, when sufficient space is not obtained on the inner surface side of the flange portion from which the bolt is pulled out due to the positional relationship with the outer ring, the bolt head is provided on the outer ring or outer ring outer peripheral portion when trying to pull out the bolt. There is a problem in that it is difficult to pull out the bolt due to interference with the flange portion for fixing the vehicle body.

A rolling bearing device according to the present invention is a rolling bearing device in which a wheel mounting flange portion is provided on an outer peripheral surface of an inner shaft disposed on an inner diameter side of an outer ring, and a bolt is press-fitted into a mounting hole provided in the flange portion. Of the chamfered portions on both axial sides formed in the mounting hole, the axial chamfering depths of the chamfered portion on the bolt head side and the chamfered portion on the bolt shaft side on the radial direction inside Is deeper than the axial chamfering depth of the chamfered portion on the bolt head side and the chamfered portion on the bolt shaft side, respectively, on the flange portion on the outer peripheral surface of the outer ring. On the opposite side, a notch recess is formed which becomes a relief recess when the bolt is pulled out from the mounting hole .

  According to the present invention, the bolt press-fitted into the mounting hole can be easily tilted toward the radially outer side of the chamfered portion on the bolt head side, so that the space on the outer peripheral side of the inner shaft provided with this flange portion is the outer ring. Even if it is narrow due to the positional relationship with the above, it is easy to remove the bolt from the mounting hole.

  The chamfer depth on each chamfered portion is shallow, that is, the axial chamfer depth on the radially inner side of the chamfered portion on the bolt head side and the radially outer side of the chamfered portion on the bolt shaft side. Includes the case of substantially zero.

  According to the present invention, even if the space on the inner surface side of the flange portion is narrow, the bolt can be easily pulled out from the mounting hole.

  The best mode for carrying out the present invention will be described with reference to FIGS. FIG. 1 is an axial sectional view of a rolling bearing device according to the present invention, FIG. 2 is an enlarged sectional view of a main part of the rolling bearing device, and FIG. 3 is a side view of the main part.

  In FIG. 1, the left side is the vehicle outer side, and the right side is the vehicle inner side. The rolling bearing device of the present embodiment is a double-row angular contact ball bearing type that supports driving wheels of an automobile, and includes an outer ring 1, an inner shaft 2, an inner ring 3, a plurality of balls 4 and 5, and cages 6 and 7. And seals 8 and 9.

  The outer ring 1 is fixed to a vehicle body such as a knuckle through a flange portion 11 provided on the outer peripheral surface thereof, and track portions 1a and 1b are formed in double rows on the inner peripheral surface.

  The inner shaft 2 has an inlay portion 21, a wheel mounting flange portion 22, and a raceway portion 2 a on the outer peripheral surface side. The flange portion 22 is formed with mounting holes 10 penetrating in the axial direction at a plurality of locations in the circumferential direction, and bolts 14 for fixing the disk rotor 12 and the wheels 13 of the disk brake device are formed in these mounting holes 10. It is press-fitted from the vehicle inner side.

  The bolt 14 includes a head portion 14a and a shaft portion 14b. A screw portion 14c is provided on the tip end side of the shaft portion 14b, and a serration portion 14d is provided at a position near the head portion 14a. The bolt 14 is fixed in the mounting hole 10 by causing the serration portion 14 d to be engaged with the inner peripheral surface of the mounting hole 10.

  The inner ring 3 has a raceway portion 3 a facing the raceway portion 1 a on the outer peripheral surface, and is fitted on the outer peripheral surface of the small diameter portion 23 of the inner shaft 2. A cylinder portion 23 a at the vehicle inner side end of the inner shaft 2 is caulked to the outer end surface of the inner ring 3. The balls 4 and 5 are arranged between the raceway portions 1a, 2b, 2a and 3a and are held by the cages 6 and 7 so as to be freely rotatable. The seals 8 and 9 are respectively disposed between the outer ring 1 and the inner shaft 2, The bearing space between the outer ring 1 and the inner ring 3 is sealed.

  In the above configuration, of the chamfered portions 15 and 16 on both axial sides of the mounting hole 10 of the flange portion 22, the radial direction of the chamfered portion 16 on the bolt head portion 14a side (the inner surface 22a side of the flange portion 22). The axial chamfering depths Dc and Db of the radially inner side 15b of the chamfered portion 15 on the outer side 16c and the bolt shaft portion 14b side (the outer surface 22b side of the flange portion 22) are set in the radial direction of the chamfered portion 16, respectively. It is deeper than the axial chamfering depths Dd and Da of the inner side 16d and the radially outer side 15a of the chamfered portion 15.

  The chamfering angle of the chamfers 15 and 16 may be a normal chamfering angle, for example, about 30 degrees, but is not limited to this, and can be appropriately determined according to the pulling angle of the bolt 14 or the like. In this case, with respect to the axial chamfering depths Dc and Db, the bolt 14 can be tilted more greatly as the depth becomes deeper. The magnitude relationship between the chamfering depths Dc and Db may be the same or different.

  In each of the chamfered portions 15 and 16, the chamfering depths Dc and Db are the maximum depths in the circumferential direction, and the chamfering depths Dd and Da are the minimum depths in the circumferential direction. The chamfering depth in between becomes gradually shallower from one side inside and outside in the radial direction to the other side. In this case, it is also possible to implement a step with a region where preferably half or more in the circumferential direction has a constant deep chamfering depth Dc, Db and a remaining region in the circumferential direction has a constant shallow chamfering depth Dd, Da. can do.

  In addition, on the side of the outer peripheral surface of the outer ring 1 that faces the inner side surface 22a of the flange portion 22, notched recesses 17 are formed at one or more locations in the circumferential direction. The notch recess 17 is formed by forging when the outer ring 1 is forged. In this case, since the notch recess 17 is provided by the forging, it is possible to reduce the cost and prevent the strength from being reduced by omitting the cutting process as compared with the case where the outer peripheral portion of the outer ring is cut and removed. The radial depth and the axial length of the cutout recess 17 can be determined as appropriate in accordance with the drawing operation of the bolt 14.

  In the above configuration, the bolt 14 is pressed into the mounting hole 10 of the flange portion 22 in the axial direction, and the bolt 14 is fixed to the mounting hole 10 by meshing between the serration portion 14d and the inner peripheral surface of the mounting hole 10, but the bolt 14 is broken. For example, when the bolt 14 is pulled out from the mounting hole 10 and removed, the bolt 14 is displaced by a certain width along the axial direction with respect to the mounting hole 10 to disengage the serration portion 14 d of the bolt 14 from the mounting hole 10. When the bolt 14 is tilted radially inward and outward with respect to the axial direction as indicated by phantom lines using the shapes of the chamfered portions 15 and 16 of the mounting hole 10, the space on the inner side surface 22 a side of the flange portion 22. Even if the head is narrow, the head 14a can be pulled out from the mounting hole 10 without interfering with the outer ring 1 or the like.

  In a situation where the outer peripheral surface of the outer ring 1 is very close to the head portion 14a of the bolt 14 press-fitted into the mounting hole 10, the inner shaft 2 is rotated with respect to the outer ring 1 etc. The bolt 14 is pulled out by matching the circumferential phase angle between the bolt 17 and the bolt 14. The notch 17 serves as a relief recess when the bolt 14 is pulled out from the mounting hole 10, and the head 14 a of the bolt 14 does not interfere with the outer ring 1.

  As a result, the P.V. of the bolts 14 provided along the circumferential direction. C. D (pitch circle radius) and P. C. Even if D (bearing PCD) is close and the space on the inner surface 22a side of the flange portion 22 is narrow, the bolt 14 can be easily removed from the mounting hole 10 without causing interference with the outer ring 1 or the like. Pull out. Further, since the above phase alignment is performed, the notch recess 17 may be provided only at one place on the outer peripheral surface of the outer ring 1, which is advantageous in terms of cost. Further, the P.P. C. D and bearing P.D. C. The approximate allowable value of D is widened, and the degree of freedom in designing the bearing device is improved.

  As another embodiment, as shown in FIGS. 4 to 6, the flange portion 22 is thicker than other portions adjacent in the circumferential direction at a plurality of locations on the inner surface 22 a in the circumferential direction. A thick portion 22c (maximum thickness Tb) is formed, and both circumferential portions of the thick portion 22c are formed as a pair of ribs 22d extending substantially along the radial direction, and a circumferential intermediate region 22e between both ribs 22d is formed. The attachment hole 10 having the same configuration as described above may be formed in the intermediate region 22e by thinning the wall to a thickness Ta (<Tb). The chamfered portions 15 and 16 having different chamfering depths inside and outside in the radial direction are provided on both sides in the axial direction of the mounting hole 10 as in the case of FIG.

  However, in FIG. 4 thru | or FIG. 6, only the thick part 22c is shown. In this configuration, since the strength of the flange portion 22 is ensured by the thick portion 22c, the entire flange portion 22 is not thick, and the portion adjacent to the circumferential direction of the thick portion 22c is the above-described portion of the thick portion 22c. The weight is reduced by making it thinner than the intermediate region 22e. Further, by making the middle region 22e in the circumferential center of the thick portion 22c thin and forming the mounting hole 10 with a shallow hole depth, the head portion 14a of the bolt 14 does not protrude too far to the outer ring 1 side. In addition, the bolts 14 can be easily pulled out together with the chamfered portions 15 and 16 of the flange portion 22.

  In this case, even if the entire thick portion 22c has a constant thickness and does not have the rib 22d or the intermediate region 22e, the bolt 14 can be attached if the mounting hole 10 has the chamfered portions 15 and 16. It can be easily pulled out.

  Of course, the present invention can be applied to any rolling element, regardless of whether it is for a driven wheel or a driving wheel, as long as it has a wheel mounting flange, regardless of whether it is a roller or a tapered roller.

Sectional drawing which follows the axial direction of the rolling bearing apparatus which concerns on best embodiment of this invention. FIG. 1 is an enlarged cross-sectional view of a main part of the rolling bearing device of FIG. Side view of essential parts of FIG. The expanded sectional view of the flange part of other embodiments Side view of essential parts of FIG. Transverse plan view along line (6)-(6) in FIG.

Explanation of symbols

22 Flange portion 10 Mounting hole 14 Bolt 14a Bolt head portion 14b Bolt shaft portion 15, 16 Chamfered portion 15a, 16c Radial outer side 15b, 16d of chamfered portion Radial inner side of chamfered portion

Claims (1)

A rolling bearing device in which a wheel mounting flange portion is provided on an outer peripheral surface of an inner shaft disposed on an inner diameter side of an outer ring, and a bolt is press-fitted into a mounting hole provided in the flange portion,
Of the chamfered portions on both sides in the axial direction formed in the mounting hole, the axial chamfering depths of the radially outer side of the chamfered portion on the bolt head side and the radially inner side of the chamfered portion on the bolt shaft side are shown. , Deeper than the axial chamfering depth of the chamfered portion on the bolt head side and the radially outer side of the chamfered portion on the bolt shaft side ,
2. A rolling bearing device according to claim 1, wherein a notch recess is formed on a side of the outer peripheral surface of the outer ring facing the flange portion, which serves as a relief recess when a bolt is pulled out from the mounting hole .

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