JP4517617B2 - Outer ring member of rolling bearing device and manufacturing method thereof - Google Patents

Description

The present invention relates to an outer ring member of a rolling bearing device and a manufacturing method thereof .

  For example, in a rolling bearing device for supporting a wheel of an automobile, a flange extending radially outward is provided on an outer ring member, and the flange is attached to a fixing member (a part of a vehicle body) with a bolt.

That is, while providing screw holes along the axial direction at a plurality of locations in the circumferential direction of the flange, the fixing member is provided with a through hole concentric with the screw hole, and a bolt is inserted from the through hole side of the fixing member, The bolt is screwed to the screw hole of the flange to fix the flange to the fixing member (see Patent Documents 1 and 2).
JP 2001-242188 A JP 2002-337505 A

  By the way, to increase the load capacity of the rolling bearing device, it is necessary to increase the diameter of the balls or increase the number of balls used. Accordingly, it is necessary to increase the diameter of the inner raceway surface of the outer ring member and to increase the outer diameter of the outer ring member in order to keep the thickness of the outer ring member constant. On the other hand, the pitch circle diameter of the screw hole of the flange cannot be changed according to the standard for each automobile manufacturer. Therefore, when the outer diameter of the outer ring member is increased as described above, the inscribed circle of each screw hole tends to approach the outer peripheral surface of the outer ring member.

  Further, in the case of a rolling bearing that is fixed to the vehicle body via a flange, stress concentrates on the base end portion of the flange, and it may be difficult to ensure the strength of this portion. Therefore, in order to improve the strength of the flange of the outer ring member, the anti-contact surface 85 on the opposite side of the surface of the flange 81 that contacts the fixing member 82 (hereinafter referred to as the contact surface 83) and the outer ring member A slope 86 that is concavely curved is formed between the outer peripheral surface and the stress to prevent concentration. The inclined surface 86 starts from the point X of the anti-contact surface 85 of the flange and is smoothly connected to the outer peripheral surface of the outer ring member.

  For this reason, if it is set on a pitch circle connecting the base point X of the inclined surface 86 on the anti-contact surface 85 and the center 88 of each screw hole 87, the screw hole 87 is for the following reason. It becomes difficult to process for forming.

  That is, the screw hole 87 is made by drilling using a drill 90 or threading using a tap, but when this drilling is performed from the contact surface 83 side, the anti-contact surface 85 after the drilling. The protruding amount of burrs protruding to the side will increase. Therefore, when the hole is formed from the side opposite to the contact surface 85, the protrusion amount of the burr that protrudes toward the contact surface 83 after the hole is drilled is reduced. Therefore, in order to save the effort of removing the burr, it is preferable to perform the drilling with the drill 90 from the counter contact surface 85 side of the flange 81 toward the contact surface 83 side as shown in FIG. . However, in this case, the outer peripheral corner 92 of the cutting edge of the drill 90 comes into contact with the inclined surface 86 before the center 91 of the cutting edge of the drill 90 comes into contact with the anti-contact surface 85 of the flange 81. If the speed is increased, the rotation center of the drill 90 may be inclined with respect to the target line, leading to a decrease in processing accuracy. In order to prevent a reduction in machining accuracy, it is necessary to slow down the feed rate of the drill 90 as much as possible, resulting in a long machining time and high machining cost.

An outer ring member of a rolling bearing device according to the present invention has a flange extending radially outward on an outer periphery, and screw holes used for fixing to a knuckle are provided in an axial direction at a plurality of circumferential positions of the flange. And an outer ring member of a rolling bearing device integrally formed by forging, wherein one side surface of the flange is formed substantially flat along a radial direction, and the screw is provided on a base side of the other side surface of the flange. A slope is provided from the vicinity of a circle connecting the centers of the holes toward the outer peripheral surface of the outer ring member, and a portion corresponding to the screw hole of the slope is provided to avoid interference of a cutting edge of a drill that forms the screw hole. a recess is provided, the micro padding section connected by a curved surface to the outer surface of the outer ring member from the peripheral edge of the screw hole of the bottom screw holes is to face on the other side in the axial direction which is open in the concave portion is formed It is characterized in that.
In the manufacturing method of the outer ring member of the rolling bearing device according to the present invention, flanges extending radially outward are provided on the outer periphery, and screw holes used for fixing to the knuckle are axially provided at a plurality of circumferential positions of the flange. A method of manufacturing an outer ring member of a provided rolling bearing device, wherein one side surface of the flange is formed substantially flat along a radial direction, and a center of the screw hole is formed on a base side of the other side surface of the flange. In order to avoid interference between the inclined surface formed from the vicinity of the circle connecting the outer ring member toward the outer peripheral surface of the outer ring member and the cutting edge of the drill that forms the screw hole formed in the portion corresponding to the screw hole of the inclined surface . after forming by forging a recess and a micro-padding section connected by a curved surface to the outer surface of the outer ring member from the flat surface and the flat surface formed on the other side, the said flat surface of said recess Flip hole tip is brought into contact with the drill for opening, it is characterized by forming the screw hole from the other side of the flange.

  The recess may be formed by forging.

  In this case, since the inclined surface is provided on the entire circumference of the base side of the other side surface of the flange of the outer ring member and the concave portion is provided in the portion corresponding to the hole, the drill tip does not interfere with the inclined surface when making the hole. . Therefore, it becomes possible to prevent the drill from tilting when drilling, and it is possible to increase the feed rate of the drill.

  In the present invention, since the hole can be formed in the flange of the outer ring member with high accuracy in a short time, a low-cost and highly reliable rolling bearing device can be provided.

  1 to 7 show an embodiment of the present invention. In this embodiment, a rolling bearing device 1 used on the driven wheel side of an automobile is taken as an example. In FIG. 1, the left side of the rolling bearing device 1 is the vehicle outer side, and the right side is the vehicle inner side.

  The inner ring member 3 is rotated around the axis through two rows of balls (an example of rolling elements) 4, 5 arranged on the outer ring member 2 that is fixed non-rotatably at circumferentially spaced intervals by the crown-shaped cage 6. Is supported rotatably. Seals 7 and 8 are attached to both sides in the axial direction between the outer ring member 2 and the inner ring member 3. These seals 7 and 8 prevent the lubricant in the bearing space 11 from leaking to the outside, and prevent external muddy water and the like from entering the bearing space 11.

  Flange 2a protruding radially outward is formed on the outer peripheral surface of outer ring member 2, and screw holes 2b are provided along the axial direction at a plurality of locations in the circumferential direction of flange 2a. By fixing the flange 2a to the knuckle 9 which is a part of the vehicle body with the bolt 10, the outer ring member 2 is fixed in a non-rotating manner. The bolt 10 is inserted into the through hole 9a from the knuckle 9 side and is screwed into the screw hole 2b of the flange 2a. Depending on the vehicle, the outer ring member 2 may be fixed to the knuckle 9 by inserting the bolt 10 into the through hole instead of the screw hole 2 b and screwing the nut into the bolt 10.

  The inner ring member 3 includes an inner shaft 3A and a tubular member 3B that is fitted to the inner side of the inner shaft 3A. The cylindrical member 3B is integrated with the inner shaft 3A by rolling and crimping the inner side end portion of the inner shaft 3A radially outward. This cylindrical member 3B is an inner ring of a general single row angular contact ball bearing.

  The two rows of balls 4 and 5 are provided on the inner race surface of the outer ring member 2 in the axial direction adjacent to each other, on the outer race surface of the inner shaft 3A and on the outer circumference surface of the cylindrical member 3B. It is interposed between each track surface.

  A flange 3a that protrudes radially outward is integrally formed on the outer side of the inner shaft 3A on the outer side of the vehicle. Through holes 3b penetrating in the axial direction are provided at a plurality of locations in the circumferential direction of the flange 3a. Bolts 15 are fitted and fixed to the through holes 3b. A hole provided in the disk rotor 16 and the wheel 18 is passed through the bolt 15, and a nut (not shown) is attached to the bolt 15 protruding from the hole, whereby the disk rotor is mounted on the flange 3a. 16 and wheels 18 are fixed.

  Here, since it devised so that the screw hole 2b can be accurately formed in the circumferential direction multiple places of the flange 2a of the outer ring member 2, it demonstrates.

  First, in order to increase the bearing load capacity, the rolling bearing device in this embodiment includes a circle diameter connecting the centers of the balls 4 and 5, a diameter of the inner raceway surface of the outer ring member 2, and an outer diameter of the outer ring member 2. The diameter is increased. However, the pitch circle diameter of the screw hole 2b of the flange 2a cannot be changed according to the standard for each automobile manufacturer. From this, the outer peripheral surface of the outer ring member 2 and the inscribed circle of each screw hole 2b are arranged close to each other. In the illustrated example, the inscribed circle diameter of each screw hole 2b is set slightly larger than the outer diameter of the outer peripheral surface of the outer ring member 2.

  Further, almost the entire contact surface 2c of the flange 2a is formed to be substantially flat by cutting.

  Furthermore, the anti-contact surface 2d of the flange 2a and the outer peripheral surface of the outer ring member 2 are connected by an inclined surface 2e. The inclined surface 2e is formed in an annular shape in the circumferential direction, but a recess 2g is formed in a portion where the screw hole 2b is formed so as to fold the inclined surface. The recess 2g and the shape of the periphery thereof will be described in detail. First, on the outer peripheral surface of the outer ring member 2, a step portion 2i having a diameter slightly larger than the smallest outer diameter portion 2h having the smallest outer diameter is formed. The inclined surface 2e is formed from the point X1 on the inner diameter side of the pitch circle diameter portion P of the screw hole 2b on the counter-contact surface 2d of the flange 2a to the point X2 on the stepped outer peripheral surface 2i. The cross section of the recess 2g, that is, the shape of the inner peripheral surface of the portion where the inclined surface 2e is bent, is substantially U-shaped, as shown in FIG. 1, when viewed from the direction of arrow A in FIG. However, the most radially inward portion is in contact with the stepped portion outer peripheral surface 2i. Moreover, when the same part is seen in sectional drawing of FIG. 4, the recessed part 2g is connected by the curved surface from the peripheral part of the screw hole 2b to the outer peripheral surface of a step part. This curved surface is formed from the Y1 point on the periphery of the screw hole 2b to the Y2 point on the outer peripheral surface of the stepped portion. As described above, the portion of the recess 2g near the screw hole 2b has an aspherical composite curved surface composed of a plurality of curved surfaces each having a different curvature. Then, before the screw hole is formed, the surface is a flat surface on the outer side in the radial direction from the point Y1 of the recess 2g, and is continuous with the anti-contact surface 2d.

  By forming the recess 2g in such a shape, the interference of the drill blade can be minimized while ensuring the strength of this portion. Further, the tip of the drill can be brought into contact with the flat surface at the bottom of the recess 2g.

  Here, the manufacturing procedure of the outer ring member 2 will be described.

  First, the outer ring member 2 is rough-finished by hot forging a metal cylindrical base material such as JIS standard S55C as shown by a two-dot chain line in FIG. By cutting the surface 2c and the two inner diameter raceway surfaces, an outer shape close to the finished product is obtained. In the flange 2a of the outer ring member 2 obtained in this way, a screw hole 2b is formed by drilling in a region where the screw hole 2b is to be formed using a drill 20 and then threading using a tap.

  By the way, since the slope 2e, the recess 2g, and the curved surface 2f described above are formed in the forging step, most of the region where the screw hole 2b is to be formed on the anti-contact surface 2d of the flange 2a when the forging step is completed. The part becomes almost flat. Therefore, when drilling with the drill 20, the tip of the drill can be brought into contact with the flat portion, so that a highly accurate hole can be formed without the drill swinging. In addition, since this flat portion can be used as a reference surface when performing the above-described cutting process, the contact surface 2c can be formed with high accuracy.

  In addition, since the recessed space 2g is secured in the previous stage of the drilling step, in the drilling step, as shown in FIG. 7, the cutting edge center 21 of the drill 20 is placed on the anti-contact surface 2d of the flange 2a. The outer peripheral corner 22 of the cutting edge of the drill 20 can be suppressed to slightly interfere with the minute build-up portion 2f. As a result, when drilling is performed by the drill 20, the anti-contact surface 2d of the flange 2a is excavated at substantially the same time, although the slope of the minute built-up portion 2f is slightly shaved first. Therefore, since the rotation center of the drill 20 can be prevented from being tilted with respect to the target line as in the conventional example, the drilling operation for forming the screw hole 2b can be performed, for example, the feed speed of the drill 20 can be increased. It becomes possible to carry out with high accuracy in a short time. Therefore, the manufacturing cost of the outer ring member 2 can be reduced.

  Further, since the hole is formed from the side opposite to the contact surface 2d toward the contact surface 2c, as specified in the description of the conventional example, the protrusion of the burr that protrudes downstream in the hole formation direction after the hole is formed. This makes it possible to reduce the amount and save the effort of removing burrs.

  Hereinafter, other embodiments and application examples of the present invention will be described.

  Although not shown, the present invention can also be applied to a rolling bearing device of the type used on the drive wheel side. In this type, for example, the drive shaft is spline-fitted to the central portion of the inner shaft 3A in the above embodiment.

  In the above embodiment, the outer peripheral surface of the inner shaft 3A is an inner raceway surface of the balls 5 on the outer side of the vehicle. The present invention can also be applied to those equipped with inner rings dedicated to the balls 5 in the side row.

  Furthermore, as shown in FIG. 8, the present invention can be applied to a rolling bearing device 1 of a type using two inner rings 31a and 32a provided in a general double row angular ball bearing. Further, the present invention can also be applied to a tapered roller bearing device using double row tapered rollers as rolling elements.

The front view which shows the rolling bearing apparatus which concerns on one Embodiment of this invention. 1 is a cross-sectional view taken along line (2)-(2) in FIG. The perspective view which shows a part of outer ring member of FIG. Sectional drawing which shows the upper half of the outer ring member of FIG. Top view showing a part of the outer ring member of FIG. The figure which shows the manufacturing process of the outer ring member of FIG. The figure which shows the screw hole formation process with respect to the flange of the outer ring member of FIG. FIG. 2 is a side view corresponding to FIG. 2 in another embodiment of the present invention. Sectional drawing which shows the upper half of the outer ring member of the rolling bearing apparatus of a prior art example The figure which shows the screw hole formation process with respect to the flange of the outer ring member of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rolling bearing apparatus 2 Outer ring member 3 Inner ring member 2a Flange of outer ring member 2b Flange screw hole 2c Flange contact surface 2d Flange contact surface 2e Slope 2f Curved surface 2g Recessed part 9 Knuckle (fixing member) 10 Bolt 20 Drill 21 Center of drill tip 22 Peripheral corner of drill tip

Claims (2)

A rolling bearing device having flanges extending radially outward on the outer periphery, screw holes used for fixing to the knuckle being axially provided at a plurality of locations in the circumferential direction of the flange, and integrally formed by forging The outer ring member of
One side of the flange is formed substantially flat along the radial direction,
A slope is provided from the vicinity of a circle connecting the center of the screw hole to the outer peripheral surface of the outer ring member on the base side of the other side surface of the flange, and the screw hole is formed in a portion corresponding to the screw hole of the slope. Provide a recess to avoid the interference of the drill's cutting edge,
In this recess , a minute build-up portion connected by a curved surface is formed from the peripheral edge portion of the screw hole at the bottom portion that faces the other axial side where the screw hole is open to the outer peripheral surface of the outer ring member. An outer ring member of the rolling bearing device. A method of manufacturing an outer ring member of a rolling bearing device in which a flange extending radially outward is provided on an outer periphery, and screw holes used for fixing to a knuckle are provided in a plurality of locations in the circumferential direction of the flange in an axial direction. ,
One side surface of the flange is formed substantially flat along the radial direction,
On the base side of the other side surface of the flange, a slope formed from the vicinity of a circle connecting the center of the screw hole toward the outer peripheral surface of the outer ring member, and a portion corresponding to the screw hole of the slope are formed. Forging a flat surface formed on the other side surface of the flange and a concave portion having a small build-up portion connected by a curved surface from the flat surface to the outer peripheral surface of the outer ring member in order to avoid interference with the cutting edge of the drill that forms the screw hole. After forming
The screw holes into contact with the tip of the drill to open to the flat surface of the recess, the production method of the outer race member of the rolling bearing device characterized by forming the screw hole from the other side of the flange.

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