JP2009001273A - Vehicle bearing device and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a detaching resistance of a caulking part in a bearing device for a vehicle. <P>SOLUTION: In this bearing device for a vehicle, a rolling bearing 2 is externally mounted to a shaft element 1, to which a wheel is mounted, and a free end of the shaft element 1 is swollen and deformed outward in a radial direction by rolling caulking. The swollen and deformed caulking part 3 is pressed to an outer end surface of an inner ring of the rolling bearing 2, so as to fix the rolling bearing 2 to the shaft element 1. The caulking part 3 is formed of a curved part formed on a radially inner side, and a tapered face formed in an area from a radially intermediate position on the radially outer side more than the curved part to an outer peripheral edge and gradually reduced in thickness dimension toward the outer peripheral edge. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle bearing device in which a rolling bearing is mounted on a shaft body and a manufacturing method thereof.

  As an example of this type of conventional vehicle bearing device, there is a vehicle hub unit as shown in FIG. 5 (see, for example, Patent Document 1).

  In the illustrated vehicle hub unit B, a double-row outward angular contact ball bearing 82 is externally attached to a shaft portion 81 of a hub wheel 80 as a shaft body, and the free end of the shaft portion 81 is radially outward by rolling caulking. By bulging and deforming in the direction, the bulging and crimping caulking portion 85 is pressed against the outer end surface of the inner ring 84 of the bearing 82 to fix the bearing 82 to the hub wheel 80 to prevent it from coming off.

Note that the pre-caulking shape of the shaft portion 81 of the hub wheel 80 has a uniform outer diameter at each position in the axial direction, as indicated by a virtual line in the figure. The free end of the shaft portion 81 is rolled and caulked using a caulking jig 90 as shown in FIG. At this time, the tip of the caulking jig 90 is applied to the shaft portion 81, and the caulking jig 90 is rolled around the one-dot chain line O. As a result, the free end of the shaft portion 81 is bulged and deformed outward in the radial direction, and the inner ring 84 is prevented from coming off by the swollen caulking portion 85.
JP-A-8-290224 (FIGS. 5, 7, etc.)

  In the above-described conventional example, the outer end surface of the caulking portion 85 is rounded, but in such a caulking form, it can be seen that the outer peripheral edge side of the caulking portion 85 is more strongly pressed toward the inner ring 84 side. However, it cannot be said that the radially intermediate portion of the caulking portion 85 is pressed too strongly against the inner ring 84 side. With such a shape of the caulking portion 85, there is a concern that a phenomenon of returning the caulking portion 85 after caulking occurs in a severe case and a phenomenon in which the outer peripheral edge side separates from the inner ring 84, and there is a drag force against a falling load, that is, a drag force. Prone to lack of results.

  Accordingly, an object of the present invention is to improve the pull-out resistance by the caulking portion in the bearing device.

  According to a first aspect of the present invention, there is provided a vehicle bearing device in which a rolling bearing is externally fitted to a shaft body to which a wheel is mounted, and the free end side of the shaft body is bulged and deformed radially outward by rolling caulking. The swelled and deformed caulked portion is pressed against the outer end surface of the inner ring of the rolling bearing to prevent the rolling bearing from coming off and fixed to the shaft body, and the caulked portion is radially inward. And a tapered surface portion that is formed in a region from a radially intermediate position on the outer side in the radial direction to the outer peripheral edge of the curved portion and whose wall thickness is gradually reduced toward the outer peripheral edge side. Yes.

  Since the caulking portion in the vehicular bearing device according to the present invention has a specific shape obtained by strongly pressing the caulking portion from the midway portion in the radial direction to the outer peripheral side when caulking, It can be said that the outer peripheral edge side of the caulking portion easily comes into close contact with the outer end surface of the inner ring and the return phenomenon is less likely to occur. For this reason, it becomes possible to prevent the outer peripheral edge side of the caulking portion from moving away from the inner ring side, and the pull-out resistance can be increased compared to the conventional example.

  The vehicular bearing device according to a second aspect of the present invention is the vehicular bearing device according to the first aspect, wherein the taper starting point position G of the tapered surface is set on the radially outer side than the inner ring inner diameter.

  The vehicle bearing device according to a third aspect of the present invention is the vehicle bearing device according to the first or second aspect, wherein the starting point of the curve on the inner diameter side of the caulking portion is set outside the shaft end of the inner ring. .

  A vehicle bearing device according to a fourth aspect of the present invention is the vehicle bearing device according to any one of the first to third aspects, wherein the tapered surface is further caulked after the caulking portion is formed by rolling caulking. It is formed by compressing the part with a tool having a conical recess on the tip surface.

  According to a fifth aspect of the present invention, there is provided a method of manufacturing a vehicle bearing device, wherein a rolling bearing is externally attached to a shaft body to which a wheel is attached, and the free end side of the shaft body bulges radially outward by rolling caulking. A method of manufacturing a vehicular bearing device in which the rolling bearing is prevented from coming off and fixed to a shaft body by pressing the swollen and deformed caulking portion against the outer end surface of the inner ring of the rolling bearing, wherein the caulking portion is A curved portion formed on the radially inner side, and a tapered surface portion formed in a region from a radially intermediate position on the radially outer side to the outer peripheral edge with respect to the curved portion, the wall thickness dimension being gradually reduced toward the outer peripheral edge side, and The taper surface is formed by forming the caulking portion by rolling caulking and then compressing the caulking portion with a tool having a conical recess at the tip surface.

  In this invention, by devising the shape of the outer end surface of the caulking portion, the caulking portion is pressed against the outer end surface of the inner ring with an appropriate strength, and the return phenomenon is less likely to occur after caulking. As a result, it is possible to increase the resistance to detachment by the caulking portion as compared with the conventional case.

  In addition, since the upper limit of the inclination angle of the tapered surface formed in the caulking portion is properly defined, it is possible to prevent the rolling element from being indented against the raceway surface of the inner ring during caulking, and the rolling bearing Operation stability can be secured.

  The details of the present invention will be described based on embodiments shown in the drawings. Here, a vehicle hub unit is taken as an example of the vehicle bearing device.

  1 and 2 relate to one embodiment of the present invention, FIG. 1 is a longitudinal side view of a vehicle hub unit, and FIG. 2 is a process diagram for explaining a caulking form.

  In the figure, A indicates the entire vehicle hub unit as a vehicle bearing device, 1 is a hub wheel as a shaft body, 2 is a double-row outward angular ball bearing as a rolling bearing, and 3 is a caulking portion. is there.

  The hub wheel 1 includes an annular plate portion 11 to which a wheel (not shown) is attached and a double-row outward angular ball bearing 2 and a caulking portion 3 for fixing the double-row outward angular ball bearing 2 to the shaft end. A shaft portion 12 is formed.

  The double-row outward angular ball bearing 2 is arranged in two rows, an inner ring 21 having a single race that is externally fitted to the small-diameter outer peripheral surface 12a of the shaft portion 12, and a single outer race 22 having two rows of race grooves. A plurality of balls 23 provided and two crown-shaped cages 24 and 25 are provided, and the large-diameter outer peripheral surface 12b of the shaft portion 12 of the hub wheel 1 described above is configured as one inner ring. A radially outward flange 26 is provided on the outer periphery of the outer ring 22, and is attached to a non-rotating axle case or the like via the flange 26.

  This embodiment is characterized by the shape of the caulking portion 3 of the shaft portion 12 of the hub wheel 1.

  That is, when the thickness dimension of the region W from the midway position G in the radial direction of the caulking portion 3 to the outer peripheral edge is set gradually thinner toward the outer peripheral edge side, the outer end surface of the region W of the caulking portion 3 is tapered. It is formed on the surface 3a. And angle (theta) made by this taper surface 3a and the plane Z along radial direction is set to the range of 30-45 degree | times.

  The taper starting point position G of the tapered surface 3a is appropriately specified, for example, on the radially outer side of the inner ring inner diameter.

  Next, a method for forming the caulking portion 3 described above will be described. First, after the inner ring 21 is externally fitted to the small-diameter portion 12a of the shaft portion 12 of the hub wheel 1 by press fitting, for example, the free end of the shaft portion 12 is used as shown in FIG. The caulking jig 90 is used for rolling caulking. At this time, the tip of the caulking jig 90 is applied to the shaft portion 12, and the caulking jig 90 is rolled around the alternate long and short dash line O. Accordingly, the free end of the shaft portion 12 is bulged and deformed outward in the radial direction, and the caulking portion 3 having a shape as shown in FIG. 2A is obtained.

  Thereafter, as shown in FIG. 2B, a punch jig 100 having a conical recess 101 is applied to the caulking portion 3 to the caulking portion 3, and the caulking portion 3 is pressed with a required pressure, whereby the caulking portion 3 has a tapered surface 3a. Form.

  As described above, the caulking portion 3 is not only obtained by rolling caulking, but is compressed and deformed by pressing, so that the caulking portion 3 can be pressed more strongly against the outer end surface of the inner ring 21 than in the conventional example. The return phenomenon of the caulking portion 3 can be made difficult to occur. Thereby, the pull-out drag of the double-row outward angular ball bearing 2 can be increased as compared with the conventional case.

  Here, the reason why the angle θ of the tapered surface 3a of the caulking portion 3 is specified as 30 to 45 degrees will be described. In other words, when the lower limit is set to less than 30 degrees, the pressing force by the press is weakened and the caulking force is insufficient. On the other hand, if the upper limit of 45 degrees is exceeded, the pressure applied by the press becomes too strong and the caulking force becomes excessive. For example, the inner ring 21 may have indentations at the contact positions of the balls 23. And the thickness of the position of the taper surface 3a of the caulking portion 3 is reduced, and the pull-out drag is conversely reduced.

  In addition, this invention is not limited only to the said embodiment, Various application and deformation | transformation can be considered.

 (1) In the above embodiment, rolling caulking and pressing are used in combination to form the tapered surface 3a in the caulking portion 3, but the tapered surface 3a can be formed only by rolling caulking. In this case, as shown in FIG. 3, assuming that the stepped wall surface 91 of the rolling caulking jig 90 ′ is inclined and the caulking jig 90 is used for caulking as shown in FIG. Good.

 (2) In the above embodiment, the vehicle hub unit is taken as an example of the bearing device. However, for example, a guide roller for a sliding door such as an automobile and other bearing devices in general can be used.

1 is a longitudinal side view of a vehicle hub unit according to an embodiment of the present invention. Process drawing for demonstrating the caulking form of the caulking part in FIG. Side view showing the shape of a rolling caulking jig for obtaining the caulking portion in FIG. Explanatory drawing which shows the caulking form using the rolling caulking jig of FIG. Vertical side view of a conventional vehicle hub unit Explanatory drawing showing rolling caulking form

Explanation of symbols

A Vehicle Hub Unit 1 Hub Wheel 12 Hub Wheel Shaft 2 Double Row Outward Angular Contact Ball Bearing 21 Bearing Inner Ring 3 Caulking Portion 3a Tapered Surface G of Caulking Portion W Radius Midway Position W Caulking Surface Existing Area

Claims (5)

A rolling bearing is fitted on the shaft body to which the wheel is mounted, the free end side of this shaft body is bulged and deformed radially outward by rolling caulking, and the swollen and deformed caulked portion is connected to the inner ring of the rolling bearing. A vehicle bearing device in which a rolling bearing is secured to a shaft body by pressing against an outer end surface,
The caulking portion is formed in a curved portion formed on the radially inner side and in a region from the middle position in the radial direction outside the curved portion to the outer peripheral edge, and the wall thickness is gradually reduced toward the outer peripheral edge. A vehicular bearing device, comprising: a tapered surface portion. The vehicle bearing device according to claim 1,
A vehicular bearing device, wherein a taper starting point position G of the taper surface is set on a radially outer side than an inner ring inner diameter. The vehicle bearing device according to claim 1 or 2,
A vehicular bearing device, wherein a starting point of bending on the inner diameter side of the caulking portion is set to the outside of a shaft end of the inner ring. The vehicle bearing device according to any one of claims 1 to 3,
The taper surface is formed by forming the caulking portion by rolling caulking, and further compressing the caulking portion with a tool having a conical concave portion at a tip end surface thereof. A rolling bearing is fitted on the shaft body to which the wheel is mounted, the free end side of this shaft body is bulged and deformed radially outward by rolling caulking, and the swollen and deformed caulked portion is connected to the inner ring of the rolling bearing. A method of manufacturing a vehicle bearing device in which a rolling bearing is secured to a shaft body by being pressed against an outer end surface.
The caulking portion is formed in a curved portion formed on the radially inner side and in a region from the middle position in the radial direction outside the curved portion to the outer peripheral edge, and the wall thickness is gradually reduced toward the outer peripheral edge. And a tapered surface portion,
The taper surface is formed by forming the caulking portion by rolling caulking, and further compressing the caulking portion with a tool having a conical concave portion at a distal end surface. Production method.

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