JP2006105203A - Bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device capable of preventing a core metal used for a synthetic resin cover, from slipping out of the cover. <P>SOLUTION: This bearing device has the synthetic resin cover 15 fitted to the inner peripheral surface of a vehicle inner side end of an outer ring member 3, and the core metal 17 of approximately short cylinder shape provided on the inner peripheral surface of a portion 15a fitted to the inner peripheral surface of the outer ring member 3. The vehicle inner side end of the core metal 17 is bent outward in the radial direction of the outer ring member 3, and the bent part 17a is embedded in the cover 15. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bearing device. More specifically, the present invention relates to a bearing device in which a synthetic resin cover is fitted on the inner peripheral surface of an outer ring member constituting the bearing device.

  2. Description of the Related Art Conventionally, a rolling bearing device has been frequently used to rotatably support a wheel on a vehicle body. As shown in FIG. 2, such a rolling bearing device generally includes an outer ring member 33 that is fixed to the vehicle body and has double-row raceway surfaces on the inner peripheral surface, and the outer ring member 33 on the inner diameter side of the outer ring member 33. The inner ring member 35 is arranged concentrically and has a double-row raceway surface on its outer peripheral surface and is rotatable. The outer ring member 33 and the inner ring member 35 are rotatably arranged between the raceway surfaces. And double row rolling elements 36. The inner ring member 35 is composed of a hub ring 37 and a separate inner ring constituting member 38 fitted to the outer diameter of the end portion on the vehicle inner side of the hub ring 37. Further, a cover 45 for preventing muddy water or the like from entering the inner diameter portion of the outer ring member from the vehicle inner side opening of the outer ring member 31 may be fitted into the end portion of the vehicle inner side. When performing such control, a sensor for detecting the rotational speed of the wheel is usually attached to the cover 45.

Such a cover 45 has conventionally been made of a metal material using a mold, but in order to reduce weight and cost, it is made to produce the cover 45 with a synthetic resin (for example, , See Patent Document 1).
However, since the cover 45 made of synthetic resin cannot provide a large fitting force by itself due to the characteristics of the material, the substantially short cylindrical cored bar 47 is provided on the inner peripheral surface of the portion fitted into the inner peripheral surface of the outer ring member. It is conceivable that a predetermined fitting force is obtained by the rigidity of the metal core 47 (see FIG. 3).

JP 2004-44664 A

  The core metal 47 is arranged at a predetermined location in the mold when the cover is manufactured, and is integrated with the cover 45. However, with the synthetic resin constituting the cover 45 and the metal constituting the core metal 47, Since the linear expansion coefficients are different, the cored bar 47 may come off the cover 45 due to repeated temperature changes and jump out to the vehicle outer side (see the white arrow in FIG. 3). When the metal core 47 is detached from the cover 45, the fitting force of the cover 45 is reduced, and as a result, the cover 45 may be displaced from a predetermined position in the outer ring member 33 or may be detached from the outer ring member 33. Then, the position of the sensor attached to the cover 45 is changed, and the rotational speed of the wheel cannot be detected accurately, so that the control of the antilock brake or the like becomes impossible. Further, the detached cored bar 47 may interfere with other parts, generate abnormal noise, or damage the other parts. Furthermore, if the cover 45 is removed, muddy water or the like may enter the inner diameter portion of the outer ring member 33 and corrode the components of the bearing device.

  In view of such circumstances, an object of the present invention is to provide a bearing device that can prevent a metal core used for a synthetic resin cover from coming out of the cover.

In the bearing device of the present invention, a synthetic resin cover is fitted to the inner circumferential surface of the outer ring member on the vehicle inner side, and the inner circumferential surface of a portion of the cover that is fitted to the inner circumferential surface of the outer ring member. A bearing device provided with a substantially short cylindrical cored bar,
A vehicle outer side end portion of the core metal is bent outward in the radial direction of the outer ring member, and the bent portion is embedded in the cover.

  In the bearing device of the present invention, the end portion of the core metal on the vehicle outer side is bent outward in the radial direction of the outer ring member, and the bent portion is embedded in the cover. Since the bent portion serves as a kind of anchor, even when the adhesive force between the cover and the core metal decreases due to temperature change, the core metal is prevented from moving out in the axial direction of the outer ring member and coming out of the cover. Is done. As a result, the fitting force of the cover can be maintained, and the cover can be prevented from being displaced or detached from the outer ring member.

Of the outer peripheral surface of the cover that is fitted into the inner peripheral surface of the outer ring member and is in contact with the inner peripheral surface, the most outer portion of the outer ring member in the axial direction of the outer ring member, and the core metal It is preferable that the bent portion is substantially in the same position in the axial direction of the outer ring member.
The cover made of synthetic resin has a tapered fitting portion with the inner peripheral surface of the outer ring member due to heat shrinkage after molding (the portion fitted on the inner peripheral surface of the outer ring member (see 15a in FIG. 1) is radially outward. The position of the distal end portion of the fitting portion and the bent portion of the metal core that provides a large fitting force (position in the axial direction of the outer ring member) ) Can be applied to the cover with a larger fitting force. Thereby, it can prevent reliably that a cover slips out from the internal peripheral surface of an outer ring member.

  According to the bearing device of the present invention, the cored bar used for the synthetic resin cover can be prevented from coming out of the cover.

Next, an embodiment of a bearing device of the present invention will be described in detail based on the attached drawings.
FIG. 1 shows a bearing device H according to an embodiment of the present invention, which is a bearing device for an axle on the driven wheel side in a vehicle. The bearing device H is fixed to the vehicle body side via a vehicle body mounting flange 1, and an outer ring member 3 having a double row outer ring raceway surface 2 on the inner peripheral surface thereof, and the outer ring on the inner diameter side of the outer ring member 3. An inner ring member 5 which is arranged concentrically with the member 3 and has a double row inner ring raceway surface 4 on the outer peripheral surface thereof, and is freely rollable between the raceway surfaces 2 and 4 of the outer ring member 3 and the inner ring member 5. And a ball 6 which is a double row rolling element. The inner ring member 5 includes a hub wheel 7 and a separate inner ring component member 8 fitted to the outer diameter of the end portion of the hub wheel 7 on the vehicle inner side. The hub ring 7 is rotatably supported by the outer ring member 3 via double rows of balls 6.

  Of the double row balls 6, one row of balls 6 a has an outer peripheral surface on the vehicle outer side of the hub wheel 7 as an inner ring raceway surface 4 a, and the other row of balls 6 b has an outer peripheral surface of the inner ring constituting member 8. Is the inner ring raceway surface 4b. The balls 6 a and 6 b in each row are held at equal intervals in the circumferential direction by a holder 9. Further, between the inner peripheral surface of the outer ring member 3 and the outer peripheral surface of the inner ring member 5 including the hub ring 7 and the inner ring constituting member 8, a bearing space 10 between the two members is formed on the vehicle outer side and the vehicle inner side. Seal portions 11a and 11b for sealing are provided.

  A mounting recess 12 to be attached to the wheel side is formed on the end surface of the hub wheel 7 on the vehicle outer side, and a hub flange 13 whose diameter is increased radially outward is formed on the outer peripheral surface of the hub wheel 7 on the vehicle outer side. Is formed. A brake disc rotor and wheels (not shown) are attached to the hub flange 14 via a hub bolt 14 press-fitted into the hub flange 13.

  A cover 15 is fitted into the inner peripheral surface of the vehicle inner side end portion of the outer ring member 3, and a sensor (not shown) for detecting the rotational speed of the wheel is attached to the cover 15. A mounting portion 16 is formed. And the rotational speed of a wheel is detected by the said sensor detecting the magnetic body of the pulsar ring 20 provided in the outer peripheral surface of the vehicle inner side edge part of the inner ring structural member 8, and rotating with the said inner ring structural member 8. It has become.

  A substantially short cylindrical cored bar 17 is provided on the inner peripheral surface of a portion 15 a of the cover 15 that is fitted into the inner peripheral surface of the outer ring member 3. The metal core 17 is used to increase the fitting force of the cover 15, that is, the force of resisting the cover 15 fitted on the inner peripheral surface of the outer ring member 3 from coming off from the outer ring member 3. The bearing device is characterized in that the end portion of the mandrel 17 on the vehicle outer side is bent outward in the radial direction of the outer ring member 3, and the bent portion 17 a is embedded in the cover 15. The bent portion 17a can be formed, for example, by pressing one end of a metal short cylindrical body constituting the cored bar 17. The size L in the radial direction of the bent portion 17a is not particularly limited, but is approximately 50 to 60% of the thickness T of the cover portion 15a fitted into the inner peripheral surface of the outer ring member 3. If the size L is too large, when the molten synthetic resin is poured into the mold after the core 17 is placed in the mold, the fluidity of the synthetic resin deteriorates due to the bent portion 17a, and the cover 15 There is a problem that a sufficient amount of synthetic resin does not wrap around the front end portion 15b, and on the other hand, if the size L is too small, the resistance to pulling out becomes small and the core bar 17 cannot be prevented from slipping out of the cover 15. There's a problem.

  In addition, the cover 15 made of synthetic resin has a tapered fitting portion 15a with the inner peripheral surface of the outer ring member due to heat shrinkage after molding (the portion 15a fitted into the inner peripheral surface of the outer ring member 3 is radially outward). The edge 15c of the outer peripheral surface of the fitting portion 15a (the outer peripheral surface in contact with the inner peripheral surface of the outer ring member 3) having a large tightening margin with the outer ring member 3 and a large fitting force. It is preferable to arrange the cored bar 17 so that the position of the cored bar 17 with the bent portion 17a (the position in the axial direction of the outer ring member 3) is aligned. By doing so, a greater fitting force can be applied to the cover 15, and the cover 15 can be reliably prevented from coming out of the inner peripheral surface of the outer ring member 3.

It is a section explanatory view of one embodiment of a bearing device of the present invention. It is sectional explanatory drawing of the conventional bearing apparatus. It is a partial cross-section explanatory drawing of the bearing apparatus which provided the metal core in the cover internal peripheral surface.

Explanation of symbols

3 outer ring member 5 inner ring member 6 ball 15 cover 17 cored bar 17a bent portion

Claims (2)

A synthetic resin cover is fitted on the inner peripheral surface of the vehicle inner side end of the outer ring member, and a substantially short cylindrical core is formed on the inner peripheral surface of the portion of the cover that is fitted on the inner peripheral surface of the outer ring member. A bearing device provided with gold,
A bearing device characterized in that a vehicle outer side end portion of the core metal is bent radially outward of the outer ring member, and the bent portion is embedded in the cover.   Of the outer peripheral surface of the cover and fitted into the inner peripheral surface of the outer ring member and in contact with the inner peripheral surface, a portion of the outer ring member closest to the vehicle outer side in the axial direction and the bent portion of the core metal Are provided at substantially the same position in the axial direction of the outer ring member.

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