JP2010116052A - Rolling bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device for improving a connection structure between a hub flange and a hub bolt, and preventing deformation of the hub flange. <P>SOLUTION: The rolling bearing device includes the hub bolt 9 to be fixed to the hub flange 3b to mount a wheel. A bolt installation hole 3b1 of a shape of a round through-hole in which the hub bolt 9 is to be pressed is formed in the hub flange 3b, and a projection portion 3e is projected on a flange surface 3b2 around the bolt installation hole 3b1. The hub bolt 9 has a bolt head portion 9b on one end of a screw shaft portion 9a, and a seating surface 9b1 is formed on the side of the screw shaft portion 9a of the bolt head portion 9b. The projection portion 3e on the flange surface 3b2 is pressed on the seating surface 9b1 of the bolt head portion 9b to bite into this seating surface in the state in which the screw shaft portion 9a side of the hub bolt 9 is inserted and pressed in the bolt installation hole 3b1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rolling bearing device in which a hub bolt for attaching a wheel is fixed to a hub flange.

  In a rolling bearing device used in a vehicle such as an automobile, a hub bolt having a serration formed larger than the inner diameter of the bolt round hole is press-fitted into a bolt round hole formed in the hub flange, and a predetermined slip What satisfies the torque is known (see Patent Document 1).

JP 2000-94902 A

  However, since the bolt round hole of the hub flange in this rolling bearing device is a straight hole having the same inner diameter, when the hub bolt is press-fitted, the press-fitting allowance at the time of press-fitting does not change until the end of press-fitting. A pressing force that deforms the surrounding portion acts greatly, and the surrounding portion of the bolt round hole on the protruding side of the hub bolt bulges and deforms as a whole hub flange. As a result, the runout accuracy of the hub flange is deteriorated, the runout of the brake rotor attached to the hub flange is generated, and the contact between the brake pad and the brake rotor is uneven. There is a problem that sound, vehicle braking failure, etc. occur at the same time.

  In view of the above-described problems, an object of the present invention is to provide a rolling bearing device in which a coupling structure between a hub flange and a hub bolt is improved and deformation of the hub flange is prevented.

Means for Solving the Problems and Effects of the Invention

  In order to solve the above-described problems, a rolling bearing device according to the present invention is a rolling bearing device that is fixed to a hub flange and includes a hub bolt for mounting a wheel, and the hub bolt is press-fitted into the hub flange. A through-hole-shaped bolt mounting hole is formed, and a convex portion projects from the flange surface around the bolt mounting hole, and the hub bolt has a bolt head at one end of a screw shaft portion, The screw shaft side of the bolt head is a seating surface, and the convex portion of the flange surface is inserted into the bolt mounting hole through the screw shaft side of the hub bolt. The seating surface is pressed and bitten.

  By setting it as the said structure, the rotation prevention of a hub bolt can be aimed at by the biting by the convex part of a flange surface and the seating surface of a bolt head. This connection has no effect on the deformation of the hub flange, and since it has a non-rotating locking force by biting in, it is possible to employ a press-fit tightening allowance that satisfies the hub bolt's retaining capability. . Thereby, the deformation of the hub flange is suppressed, the deterioration of the deflection accuracy due to the deformation of the hub flange can be prevented, and the rolling bearing device capable of eliminating various problems due to the deflection of the brake rotor can be provided.

  In order to solve the above-described problem, in the rolling bearing device of the present invention, the convex portion of the flange surface is composed of a plurality of angled ridges arranged in a radial direction from the bolt mounting hole side. The above effect is achieved by hardening, forming a ridge portion of the ridge in a wedge shape, and pressing the ridge against the seating surface of the bolt head by the ridge portion. In addition, the wedge-shaped ridges of the ridge formed on the flange surface can easily bite into the seating surface of the hub bolt, and slip torque (rotation locking force) due to biting with the seating surface can be reliably obtained.

  In order to solve the above-described problem, in the rolling bearing device of the present invention, in the protrusion, the outer side of the cross-sectional area of the biting portion that bites into the seating surface of the bolt head is larger than the inner side in the radial direction. Thus, in addition to the above effect, the hub bolt is rotated by changing at least one of the height dimension in the protruding direction of the ridge and the width dimension orthogonal to the radial direction. Even with an external force, the force can be regulated by a large pressure receiving surface (cross-sectional area) at a position far from the center of the hub bolt axis, which is beneficial for increasing the slip torque.

  Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. FIG. 1 is a cross-sectional view of a mounted state of a rolling bearing device according to the present invention. In FIG. 1, a rolling bearing device 1 includes an outer ring 2a as a fixed ring made of bearing steel, an inner ring 2b as a rotating ring, and a plurality of rows arranged between the inner ring 2b and the outer ring 2a. A rolling bearing 2 composed of a moving body 2c is provided.

  The inner ring 2b is formed integrally with the hub 3. A hub bolt 9 for fixing the hub 3 so as to be connected to a wheel (not shown) on the vehicle outer side is fixed. The hub bolt 9 is press-fitted into a through-hole-shaped bolt mounting hole 3b1 that is continuous with a constant hole diameter formed in a disk-shaped hub flange 3b that protrudes outward.

  The hub flange 3b is integrally formed on the outer periphery of one end portion (vehicle outer side) of the shaft portion 2b1 constituting the inner ring 2b so as to protrude outward in the radial direction X of the inner ring 2b. A small-diameter portion 2b2 having an outer diameter that is one step smaller is formed at the other end portion (vehicle inner side) of the shaft portion 2b1. The small-diameter portion 2b2 is press-fitted and fixed with an inner ring divided body 2b4 that includes a rolling surface 2b3 that is formed as a separate body and on which one rolling element 2c whose outer peripheral surface is arranged in a plurality of rows rolls. A rolling surface 2b5 on which the other rolling elements 2c arranged in a plurality of rows roll is formed on the outer peripheral surface between one end and the other end of the shaft 2b1. Thus, the inner ring | wheel division body 2b4 is press-fit and integrated with the other end part of the axial part 2b1, and the inner ring | wheel 2b provided with the hub flange 3b in the one end part is comprised.

  The shaft portion 2b1 of the inner ring 2b is formed with a connection insertion hole 2b6 to which a drive shaft 4 as a drive shaft for transmitting power is splined. The drive shaft 4 is passed through the connecting insertion hole 2b6 so that power can be transmitted. Then, the shaft end surface 4a of the drive shaft 4 is brought into contact with the inner ring end surface 2b7 on the vehicle inner side of the inner ring divided body 2b4 facing the shaft end surface 4a so that the end of the drive shaft 4 on the extending side is It is fixed by screwing a nut 5 as a screw fastening means.

  The rolling bearing device 1 is connected to an attachment port 6a of a vehicle fixing member 6 such as a knuckle or axle housing on the vehicle inner side of a suspension device in a vehicle. In this connection, the outer ring 2a of the rolling bearing 2 is inserted and fitted into the mounting opening 6a, and the flange 2a1 protruding outward from the outer ring 2a is fixed to the vehicle via a fastening member 7 such as a bolt and a nut. The member 6 is fixed to the peripheral surface (vehicle outer side) of the attachment port 6a.

  In order to seal the space between the inner ring 2b and the outer ring 2a of the rolling bearing 2 from the outside, a sealing device 8 is provided on the outer side of the vehicle and the inner side of the vehicle. Regulates leakage of grease filled in

  Moreover, although this example is the rolling bearing device 1 for a drive wheel, in the case where the connecting insertion hole 2b6 is not formed in the shaft portion 2b1, the other end side of the shaft portion 2b1 is extended to the outside, and the other end It can also be used for a driven wheel by being fixed so as not to come off in the axial direction Z by a caulking portion formed by plastic deformation outward in the radial direction X so that the side is caulked.

  Next, as shown in FIG. 2, the hub bolt 9 has a smaller diameter than the inner diameter of the bolt mounting hole 3b1 of the hub flange 3b, and passes through the bolt mounting hole 3b1 as a coupling structure of the hub bolt 9 and the hub flange 3b. It has the screw shaft part 9a projected in the direction. A bolt head portion 9b seated on the hub flange 3b side is formed at one end of the screw shaft portion 9a. A part of the outer peripheral surface 9c of the screw shaft portion 9a near the bolt head portion 9b is formed on the hub flange 3b. A serration 9d that is formed with a diameter larger than the inner diameter of the bolt mounting hole 3b1 and is continuously pressed into the bolt mounting hole 3b1 with a predetermined press-fit tightening margin is formed, and the remaining portion of the screw shaft portion 9a Are formed with screws.

  And the back side (screw shaft part 9a side) of the bolt head part 9b of the hub bolt 9 is made into the seating surface 9b1. The screw shaft portion 9a side of the hub bolt 9 is passed through the bolt mounting hole 3b1 so that the seating surface 9b1 is seated on the flange surface 3b2 side around the bolt mounting hole 3b1 of the hub flange 3b on the inner side of the vehicle. A serration 9d formed in a part of 9a is press-fitted into the bolt mounting hole 3b1. At the time of this press-fitting, the press-fitting allowance does not cause the flange surface 3b3 around the bolt mounting hole 3b1 on the hub bolt protruding side of the hub flange 3b on the outer side of the vehicle to bulge and deform (plastically deform), and a predetermined slip torque ( It is set so as to satisfy the (non-rotating fixing force). Thus, since the flange surface 3b3 on the hub bolt protruding side is not bulged and deformed, deterioration of runout accuracy due to deformation of the hub flange 3b is prevented.

  Further, the flange surface 3b2 around the bolt mounting hole 3b1 is provided with a projecting portion 3e that presses the seating surface 9b1 of the bolt head portion 9b of the hub bolt 9 and bites into the seating surface 9b1. As shown in FIG. 3, this convex part 3e consists of the mountain-shaped protrusion 3f arrange | positioned in multiple by the radial direction X1 from the bolt attachment hole 3b1 side. It is desirable that the protrusion 3f be hardened by induction hardening or the like so as to be harder than the hardness of the seating surface 9b1 of the hub bolt 9. The peak portion 3f1 of the mountain-shaped protrusion 3f can be formed in a wedge shape. Then, in a state in which the bolt mounting hole 3b1 is press-fitted through the screw shaft portion 9a of the hub bolt 9, the ridge portion 3f1 of the protrusion 3f is bitten into the seating surface 9b1 of the bolt head portion 9b.

  As shown in FIG. 4, the protrusion 3 f is formed so that the cross-sectional area D of the biting portion 3 f 2 that is a portion biting into the seating surface 9 b 1 of the bolt head 9 b is larger on the outer side than on the inner side in the radial direction X 1. Has been. Specifically, at least one of the height dimension H in the protruding direction of the protrusion 3f and the width dimension W orthogonal to the radial direction X1 is changed. That is, the width dimension W and the height dimension H are changed individually or in combination.

  Further, the biting portion 3f2 of the ridge 3f has its ridge 3f when the entire ridge 3f bites into the seating surface 9b1 of the bolt head 9b depending on the amount of biting, or as indicated by a dashed line E in the figure. There is a case where a part of the upper side of the portion becomes the biting portion 3f2. Further, the length L of the protrusion 3f in the radial direction X1 can be protruded outward from the outer periphery of the bolt head 9b (see FIG. 6) or hidden inside (see FIG. 7).

  As shown in FIG. 5, the seating surface 9b1 of the bolt head portion 9b can be formed in advance with a depressed recess 9b2 that engages with the above-described protrusion 3f. The recess 9b2 is formed following the shape of the protrusion 3f, and a plurality of engagement grooves 9b3 formed in a groove shape so that the protrusion 3f is fitted are provided in the radial direction X1. The engaging groove 9b3 can also be formed so that the upper side of the protrusion 3f is partially fitted. In this case, the biting portion 3f2 of the protrusion 3f may be further bite into the engagement groove 9b3 so as to plastically deform the engagement groove 9b3.

  As shown in FIG. 6, the operation of the coupling structure of the hub bolt 9 and the hub flange 3b is such that the screw shaft portion 9a of the hub bolt 9 is passed through the bolt mounting hole 3b1 and the serration 9d is press-fitted, so that the bolt mounting hole 3b1 The wedge-shaped ridge 3f1 of the protrusion 3f formed on the flange surface 3b2 is seated on the protrusion 3f of the peripheral flange surface 3b2 so that the seating surface 9b1 of the hub bolt 9 is pressed. The seating surface 9b1 is engaged in a concavo-convex state by plastic deformation.

  With such a coupling structure, a predetermined slip torque can be satisfied. This slip torque can obtain a fixed force of a predetermined magnitude by the cooperation of the detent fixing force due to the biting of the protrusion 3f and the detent fixing force due to the press-fitting of the serration 9d. Thereby, the press-fitting allowance at the time of press-fitting can be reduced to such an extent that the hub bolt 9 does not come off. Moreover, the biting of the protrusion 3f into the seating surface 9b1 of the hub bolt 9 does not affect the deformation of the flange surface 3b3 of the hub flange 3b.

  Further, as shown in FIG. 7, in the example in which the engaging groove 9b3 (9b2) is formed in the seating surface 9b1 of the hub bolt 9, when the protrusion 3f is not bited into the seating surface 9b1 of the hub bolt 9, Thus, it is possible to reduce the pressure input at the time of press-fitting. Further, as shown in FIG. 8, in the example in which the cross-sectional area D of the protrusion 3f is formed so that the outside of the radial direction X1 is large, the axial center of the hub bolt 9 is also applied to the external force to rotate the hub bolt 9. The force can be regulated by a large pressure-receiving surface (cross-sectional area D) at a position far from the center.

Sectional drawing of the attachment state of the rolling bearing apparatus which concerns on this invention. The figure which shows a hub bolt and a bolt attachment hole. The figure which shows the receiving surface around a bolt attachment hole. The figure which shows the protrusion as a convex part of a receiving surface. The figure which shows the seating surface of a hub bolt. The figure which shows the press-fit state of a hub bolt. The figure which shows the other press-fit state of a hub bolt. The figure which shows the other press-fit state of a hub bolt.

Explanation of symbols

3b Hub flange 3b1 Bolt mounting hole 3e Projection 3f Projection 3f1 Peak 3f2 Cavity 9 Hub bolt 9a Screw shaft 9b Bolt head 9b1 Seating surface 3b2 Flange surface X1 Radial direction D Cross section H Height dimension W Width dimension

Claims (3)

A rolling bearing device fixed to a hub flange and provided with a hub bolt for mounting a wheel,
The hub flange is formed with a through-hole-shaped bolt mounting hole for press-fitting the hub bolt, and a convex portion is provided on the flange surface around the bolt mounting hole.
The hub bolt has a bolt head at one end of the screw shaft portion, and the screw shaft portion side of the bolt head serves as a seating surface,
The rolling, wherein the convex portion of the flange surface is pressed against the seating surface of the bolt head while being pressed into the bolt mounting hole through the screw shaft side of the hub bolt. Bearing device.   The convex portion of the flange surface is composed of a plurality of chevron-shaped ridges arranged radially from the bolt mounting hole side, and the ridges are hardened to form a ridge portion of the ridges in a wedge shape. 2. The rolling bearing device according to claim 1, wherein the ridge is pressed into the seating surface of the bolt head by the peak portion to bite.   In the ridge, the height dimension in the protruding direction of the ridge and the radiation so that the outer side of the cross-sectional area of the biting portion that bites into the seating surface of the bolt head is larger than the inner side in the radial direction. The rolling bearing device according to claim 2, wherein at least one of the width dimensions orthogonal to the direction is changed.

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