JP5098748B2 - Wheel bearing device - Google Patents

Description

  The present invention relates to a wheel bearing device in which a hub shaft of a hub wheel to which a wheel is attached and an outer ring of a constant velocity joint are connected so as to be able to transmit torque.

In this type of wheel bearing device, for example, a structure disclosed in Patent Document 1 is known.
In this case, as shown in FIG. 6, in order to connect the hub wheel 210 and the constant velocity joint 250 so that torque can be transmitted, the end surface of the hub axle 213 of the hub wheel 210 and the constant velocity joint abutted against the end surface are connected. Both side splines (side face splines) 218 and 262 that transmit torque between the hub wheel 210 and the constant velocity joint 250 by being engaged with each other are formed on the end surface of the end wall portion 261 of the outer ring 260 of 250.
Further, in order to connect the hub axle 213 of the hub wheel 210 and the outer ring 260 of the constant velocity joint 250, an internal thread 263 corresponding to the male thread portion 273 of the connecting bolt 270 is connected to the end wall portion 261 of the outer ring 260 of the constant velocity joint 250. On the other hand, a central hole 214 through which the shaft portion 272 of the connecting bolt 270 is inserted is formed in the center portion of the hub shaft 213.
Then, with both side splines 218 and 262 engaged, the shaft portion 272 of the connecting bolt 270 is inserted from the outside of the hub shaft 213 through the center hole 214, and the male thread portion 273 of the shaft portion 272 is the end wall of the outer ring 260. The hub shaft 213 of the hub wheel 210 and the outer ring 260 of the constant velocity joint 250 are connected by being fastened to the female screw 263 of the portion 261.
JP 57-178903 A

  Incidentally, in the wheel bearing device having the structure as shown in FIG. 6, the shaft portion 272 of the connecting bolt 270 is inserted into the center hole 214 from the outside of the hub shaft 213 in a state where both side splines 218 and 262 are engaged. However, the operation of aligning the tip of the male screw portion 273 of the shaft portion 272 with the female screw 263 of the end wall portion 261 of the outer ring 260 is troublesome, and a lot of labor is required for tightening the connecting bolt 270.

  In view of the above problems, an object of the present invention is to easily connect the hub shaft of the hub wheel and the outer ring of the constant velocity joint by the connecting bolt while meshing both side splines of the hub shaft of the hub wheel and the outer ring of the constant velocity joint. It is providing the wheel bearing apparatus which can be connected to.

In order to achieve the above object, a wheel bearing device according to claim 1 of the present invention is provided with a rolling bearing on the outer periphery of a hub shaft of a hub wheel to which the wheel is attached, and an end surface of the hub shaft and a constant velocity joint. Both side splines formed on the end surface of the end wall portion of the outer ring are meshed so that torque can be transmitted, and the hub shaft of the hub wheel and the outer ring of the constant velocity joint are connected by a connecting bolt. There,
In the end wall portion of the outer ring of the constant velocity joint, a through hole into which the shaft portion of the connecting bolt is press-fitted is provided,
The shaft portion of the connecting bolt is inserted into the center hole of the hub shaft in a state in which the lower surface of the head is press-fitted into the through hole to a position where the lower surface of the connecting bolt contacts the inner surface of the end wall portion of the outer ring of the constant velocity joint. And the tip of the shaft is projected from the outer end surface of the hub shaft,
A male screw portion is formed at the tip of the shaft portion of the connecting bolt, and a hub nut of the hub wheel and an outer ring of the constant velocity joint are connected by tightening a tightening nut to the male screw portion. Features.

According to the above configuration, when the hub wheel and the constant velocity joint are integrally connected so as to be able to transmit torque, the connecting bolt is previously connected from the inner surface of the end wall portion of the outer ring of the constant velocity joint to the through hole of the end wall portion. The shaft portion is press-fitted to a position where the lower surface of the head is in contact with the inner surface of the end wall portion. As a result, the shaft portion of the connecting bolt protrudes a predetermined length from the outer surface of the end wall portion of the outer ring of the constant velocity joint.
Next, the shaft portion of the connection bolt is inserted from one end side (vehicle width direction center side) of the center hole of the hub shaft toward the other end side (vehicle width direction outer side).
Then, while engaging both side splines of the end surface of the hub shaft and the end wall portion of the outer ring of the constant velocity joint, the male threaded portion at the tip of the connecting bolt shaft protrudes to the other end of the center hole of the hub shaft Let
Here, the hub wheel and the constant velocity joint can be easily connected by tightening the tightening nut to the male thread portion of the shaft portion of the connecting bolt.
In addition, when the center hole of the hub shaft is drilled with high precision so that the shaft portion of the connection bolt and the center hole of the hub shaft are fitted with a minute gap, the connection bolt is inserted into the center hole of the hub shaft. By the operation of inserting the shaft portion, the hub wheel and the constant velocity joint can be accurately aligned on the same center line.

The wheel bearing device according to claim 2 is the wheel bearing device according to claim 1,
An end portion of the hub axle of the hub wheel is caulked outward in the radial direction to form a caulking portion that fixes the inner ring of the rolling bearing, and a side spline is formed on an end surface of the caulking portion.

  According to the said structure, the outer diameter dimension of a side spline can be enlarged by forming a side spline in the end surface of the caulking part of the hub axle of a hub wheel. The torque transmission performance can be improved by forming the side spline on the end wall portion end surface of the outer ring of the constant velocity joint with the outer diameter corresponding to the side spline of the hub shaft.

The wheel bearing device according to claim 3 is the wheel bearing device according to claim 1 or 2,
While the head of the connecting bolt is formed non-circular,
On the inner side surface of the end wall portion of the outer ring of the constant velocity joint, a recess is formed in which the head of the connecting bolt is rotated and fitted.

  According to the above configuration, when the fastening nut is tightened to the male thread portion of the connecting bolt by rotating and fitting the head of the connecting bolt into the recess of the end wall portion of the outer ring of the constant velocity joint, the connecting bolt is Since there is no unexpected idle rotation, the tightening nut can be easily tightened.

The wheel bearing device according to claim 4 is the wheel bearing device according to any one of claims 1 to 3,
While the tightening nut has a circular collar on its seat,
The outer end face of the hub axle of the hub wheel is characterized in that a centering recess having an inner diameter dimension substantially the same as the circular flange of the tightening nut is formed.

  According to the above configuration, the circular flange portion (circular seat portion) of the tightening nut is fitted into the concave portion for centering around the opening of the center hole on the outer end surface of the hub shaft, and tightened to the male screw portion of the connecting bolt. By tightening the nut, the hub wheel and the constant velocity joint can be accurately aligned on the same center line.

  Next, the best mode for carrying out the present invention will be described with reference to examples.

Example 1
A first embodiment of the present invention will be described with reference to FIGS.
1 is a longitudinal sectional view showing a wheel bearing device according to Embodiment 1 of the present invention. FIG. 2 is an explanatory view showing a state where the hub wheel and the constant velocity joint are separated.
As illustrated in FIG. 1, the wheel bearing device according to the first embodiment includes a hub wheel 10, a double row angular ball bearing 20 as a rolling bearing, and a constant velocity joint 50.

As the constant velocity joint 50, a well-known constant velocity joint called a Zepper type or a bar field type is used. An inner ring 52 integrally connected to one end of the drive shaft 51; an outer ring 60; A plurality of balls 53 disposed between the outer rings 52 and 60 and a cage 54 that holds the plurality of balls 53 are provided.
Side splines 62 are formed on the end surface of the end wall portion 61 of the outer ring 60 of the constant velocity joint 50.
Further, a through hole into which a shaft portion 72 of a connecting bolt 70 for integrally connecting the hub wheel 10 and the constant velocity joint 50 is press-fitted into the center portion of the end wall portion 61 of the outer ring 60 of the constant velocity joint 50. 63 is penetrated.

The connecting bolt 70 has a head portion 71 and a shaft portion 72, and a male screw portion 73 is formed at the tip portion of the shaft portion 72. Further, a caulking groove 74 for preventing the tightening nut 75 from rotating is provided in the male screw portion 73.
As shown in FIG. 2, the connecting bolt 70 has a shaft portion 72 that contacts the inner surface of the end wall portion 61 of the outer ring 60 of the constant velocity joint 50 and a lower surface of the head portion 71 that contacts the inner surface of the end wall portion 61. It is press-fitted into the through-hole 63 and fixed to the position where it comes into contact. As a result, the shaft portion 72 of the connecting bolt 70 protrudes a predetermined length from the end surface of the end wall portion 61 of the outer ring 60 of the constant velocity joint 50.
In addition, it is desirable to form a serration at the root portion of the shaft portion 72 of the connecting bolt 70 and press-fit the through-hole 63 at the serration shaft portion to increase the press-fitting strength and prevent rotation.

As shown in FIG. 1, the hub wheel 10 integrally includes a cylindrical hub shaft 13 and a flange 11 formed on the outer peripheral surface near one end of the hub shaft 13. A plurality of hub bolts 12 for attaching a wheel (not shown) with a brake rotor (not shown) interposed therebetween are fixed to the flange 11 at a predetermined pitch and press-fitted.
A double row angular ball bearing 20 including an outer ring 30, an inner ring 21, a plurality of balls 41, 42 as rolling elements and cages 45, 46 is assembled on the outer periphery of the hub shaft 13. In other words, in the first embodiment, the hub shaft 13 has a large-diameter shaft portion 15 formed on the flange 11 side and a diameter that is appropriately smaller than the large-diameter shaft portion 15 and continuously with the large-diameter shaft portion 15 and a stepped portion. The formed small diameter shaft portion 16 is integrally provided. A track surface 22 corresponding to one track surface 31 of the outer ring 30 is formed on the outer peripheral surface of the large-diameter shaft portion 15.
Further, after the inner ring 21 in which the raceway surface 23 corresponding to the other raceway surface 32 of the outer ring 30 is formed on the outer peripheral surface is fitted into the outer peripheral surface of the small-diameter shaft portion 16 of the hub shaft 13, the tip of the small-diameter shaft portion 16. The inner ring 21 is fixed between the stepped portion and the caulking portion 17 by the caulking portion 17 being formed by caulking the portion outward in the radial direction.
Further, a plurality of balls 41, 42 and a plurality of these balls 41, 42 are provided between the raceway surfaces 31, 32 of the outer ring 30 and the raceway surfaces 22, 23 on the hub shaft 13 side, respectively. The holders 45 and 46 to be held are assembled.
In addition, a fixing flange 35 is integrally formed on the outer peripheral surface of the outer ring 30 to be attached to a vehicle body side member (knuckle or carrier) supported by a vehicle suspension device (not shown) with a bolt.

As shown in FIG. 1, the end surface of the hub shaft 13, in this embodiment 1, the end surface of the caulking portion 17 of the hub shaft 13, is the side of the end wall portion 61 of the outer ring 60 of the constant velocity joint 50 that is abutted against this end surface. A side spline 18 that meshes with the spline 62 is formed.
Further, the center hole 14 of the hub shaft 13 is formed to have a hole diameter dimension in which the shaft portion 72 of the connecting bolt 70 is inserted (inserted) with a minute gap.

In the wheel bearing device according to the first embodiment configured as described above, when the hub wheel 10 and the constant velocity joint 50 are connected integrally so as to transmit torque, as shown in FIG. Position where the shaft portion 72 of the connecting bolt 70 contacts the through hole 63 of the end wall portion 61 from the inner surface of the end wall portion 61 of the outer ring 60 of the speed joint 50, and the lower surface of the head 71 contacts the inner surface of the end wall portion 61. Press fit. As a result, the shaft portion 72 of the connecting bolt 70 protrudes from the outer surface of the end wall portion 61 of the outer ring 60 of the constant velocity joint 50 by a predetermined length.
Next, the shaft portion 72 of the connecting bolt 70 is inserted from one end side (vehicle width direction center side) of the center hole 14 of the hub shaft 13 of the hub wheel 10 toward the other end side (vehicle width direction outer side).
At this time, the male threaded portion 73 at the distal end portion of the shaft portion 72 of the connecting bolt 70 is inserted into the hub shaft shaft while engaging both side splines 18 and 62 between the end surface of the hub shaft 13 and the outer surface of the end wall portion 61 of the outer ring 60 of the constant velocity joint 50. 13 is projected to the other end side of the center hole 14.
Here, the tightening nut 75 is tightened to the required tightening state on the male threaded portion 73 of the shaft portion 72 of the connecting bolt 70. Finally, a portion of the thin portion 76 at the end of the tightening nut 75 is caulked in the caulking groove 74 of the male screw portion 73 and stopped, thereby connecting the hub wheel 10 and the constant velocity joint 50.

Further, in the first embodiment, the shaft portion 72 of the connection bolt 70 and the center hole 14 of the hub shaft 13 are fitted so that the shaft portion 72 of the connection bolt 70 and the center hole 14 of the hub shaft 13 are fitted with a small gap. Of these, at least the center hole 14 of the hub shaft 13 is drilled with high accuracy.
Thereby, the hub wheel 10 and the constant velocity joint 50 can be accurately aligned on the same center line by the operation of inserting the shaft portion 72 of the connecting bolt 70 into the center hole 14 of the hub shaft 13.

In the first embodiment, the end portion of the hub shaft 13 is caulked outward in the radial direction, and a side spline 18 is formed on the end surface of the caulking portion 17 formed thereby. For this reason, compared with the case where the crimping part 17 is not formed, the outer diameter dimension of the side spline 18 can be enlarged.
The torque transmission is improved by forming the side spline 62 on the outer surface of the end wall portion 61 of the outer ring 60 of the constant velocity joint 50 with the outer diameter corresponding to the side spline 18 of the hub shaft 13 and engaging with it. Can do.

(Example 2)
Next, a second embodiment of the present invention will be described with reference to FIGS.
FIG. 3 is a longitudinal sectional view showing a wheel bearing device according to Embodiment 2 of the present invention. FIG. 4 is an explanatory view showing an embodiment in which the head portion of the connecting bolt is formed in a polygonal shape. FIG. 5 is an explanatory view showing an embodiment in which the heads of the connecting bolts are chamfered to a two-sided width.

As shown in FIG. 3, in the second embodiment, a circular flange portion (circular seat portion) 77 of the tightening nut 75 is provided around the opening portion of the center hole 14 on the outer end surface of the hub shaft 13 of the hub wheel 10. A centering recess 19 having the same inner diameter is formed.
In the second embodiment, the head 71 of the connecting bolt 70 is formed in a non-circular shape. For example, as shown in FIG. 4, the head 71a of the connecting bolt 70 is formed in a polygonal shape (regular pentagon in the figure), or the circular head 71b of the connecting bolt 70 is doubled as shown in FIG. It is chamfered with a width.
On the other hand, around the opening portion of the through hole 63 on the inner side surface of the end wall portion 61 of the outer ring 60 of the constant velocity joint 50, the rotation is fitted in a shape corresponding to the head portion 71a (or 71b) of the connecting bolt 70. A recess 61a (or 61b) is formed.
Since other configurations of the second embodiment are configured in the same manner as the first embodiment, the same components are denoted by the same reference numerals, and the description thereof is omitted.

Therefore, the second embodiment has substantially the same operational effects as the first embodiment.
In particular, in this second embodiment, the circular flange 77 of the tightening nut 75 is fitted into the recess 19 for centering around the opening of the center hole 14 on the outer end surface of the hub shaft 13 so that the shaft of the connecting bolt 70 is fitted. The hub wheel 10 and the constant velocity joint 50 can be accurately aligned on the same center line by tightening the tightening nut 75 on the male threaded portion 73 of the portion 72.
Further, since it is not necessary to drill the center hole 14 of the hub shaft 13 with high accuracy, it is effective in reducing the processing cost.

  In the second embodiment, the head 71a (or 71b) of the connecting bolt 70 is turned and fitted into the recess 61a (or 61b) of the end wall 61 of the outer ring 60 of the constant velocity joint 50. When the tightening nut 75 is tightened to the male threaded portion 73 of the shaft portion 72 of the connecting bolt 70, the connecting bolt 70 does not rotate unexpectedly, so that the tightening nut 75 can be easily tightened.

The present invention is not limited to the first and second embodiments.
For example, in the first and second embodiments, the double-row angular contact ball bearing 20 is used as the rolling bearing on the hub wheel side, but the present invention can also be implemented using a double-row tapered roller bearing.

It is a longitudinal cross-sectional view which shows the wheel bearing apparatus which concerns on Example 1 of this invention. It is explanatory drawing which shows the state from which the hub wheel and the constant velocity joint were isolate | separated similarly. It is a longitudinal cross-sectional view which shows the wheel bearing apparatus which concerns on Example 2 of this invention. It is explanatory drawing which shows the embodiment with which the head of the connection bolt was formed in the polygon. It is explanatory drawing which shows the embodiment by which the head of the connecting bolt was chamfered to two face width. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hub wheel 11 Flange 13 Hub shaft 14 Center hole 17 Caulking part 18 Side spline 20 Angular contact ball bearing (rolling bearing)
50 Constant Velocity Joint 60 Outer Ring 61 End Wall 62 Side Spline 70 Connection Bolt 72 Shaft 73 Male Thread 75 75 Tightening Nut

Claims (4)

A rolling bearing is provided on the outer periphery of the hub axle of the hub wheel to which the wheel is attached, and both side splines formed on the end face of the hub axle and the end wall of the outer ring of the constant velocity joint are meshed so that torque can be transmitted. A wheel bearing device in which a hub axle of the hub wheel and an outer ring of the constant velocity joint are connected by a connecting bolt,
In the end wall portion of the outer ring of the constant velocity joint, a through hole into which the shaft portion of the connecting bolt is press-fitted is provided,
The shaft portion of the connecting bolt is inserted into the center hole of the hub shaft in a state in which the lower surface of the head is press-fitted into the through hole to a position where the lower surface of the connecting bolt contacts the inner surface of the end wall portion of the outer ring of the constant velocity joint. And the tip of the shaft is projected from the outer end surface of the hub shaft,
A male screw portion is formed at the tip of the shaft portion of the connecting bolt, and a hub nut of the hub wheel and an outer ring of the constant velocity joint are connected by tightening a tightening nut to the male screw portion. A wheel bearing device. The wheel bearing device according to claim 1,
A wheel characterized in that the end of the hub axle of the hub wheel is caulked outward in the radial direction to form a caulking portion that fixes the inner ring of the rolling bearing, and a side spline is formed on the end surface of the caulking portion. Bearing device. The wheel bearing device according to claim 1 or 2,
While the head of the connecting bolt is formed non-circular,
A bearing device for a wheel, wherein a concave portion is formed on the inner side surface of the end wall portion of the outer ring of the constant velocity joint so as to stop and fit the head of the connecting bolt. The wheel bearing device according to any one of claims 1 to 3,
While the tightening nut has a circular collar on its seat,
A wheel bearing device characterized in that a concave portion for centering is formed on the outer end surface of the hub shaft of the hub wheel and has an inner diameter dimension substantially the same diameter as the circular flange portion of the tightening nut.

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