JP2007022164A - Bearing device for wheel and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a wheel and a method of manufacturing bearing devices capable of fixing wheels and braking members to a flange formed at the peripheral surface of a hub with the required fastening torque without requiring much labor. <P>SOLUTION: The bearing device of the wheel is equipped with the flange 18 formed at the peripheral surface of a rotary wheel and a plurality of hub bolts 20 to be fitted by pressure in hub bolt inserting holes 19 bored in the flange, wherein the head of each hub bolt is made in a non-circular shape at least partially so as to enable the fitting force to be checked by a torque measuring tool 27. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wheel bearing device for rotatably supporting a vehicle wheel with respect to a vehicle body and a method for manufacturing the same.

  As shown in FIG. 11, a wheel bearing device that rotatably supports a vehicle wheel with respect to a vehicle body includes a stationary wheel 11 and rolling elements formed on an inner peripheral surface (or outer peripheral surface) of the stationary wheel 11. The hub 13 as a rotating wheel having a rolling element raceway groove 14 opposed to the raceway groove 12 on the outer peripheral surface (or inner peripheral surface) and the rolling ring raceway grooves 12, 14 of the stationary wheel 11 and the hub 13 can freely roll. A plurality of rolling elements 15 are provided, and a flange 18 for attaching the wheel 16 and the braking member 17 to the hub 13 is formed on the outer peripheral surface of the hub 13.

  The flange 18 has a plurality of hub bolt insertion holes 19. These hub bolt insertion holes 19 are formed at a constant pitch in the circumferential direction of the flange 18, and the wheel 16 and the brake member rotor 17 are tightened with a hub nut 20 that is press-fitted into the hub bolt insertion hole 19 with a hub nut 21. It is fixed to. A knuckle 23 is fixed to the flange 22 formed on the outer peripheral surface of the stationary wheel 11 by a plurality of bolts 24.

In such a wheel bearing device, if the hub bolt insertion hole 19 has a processing error exceeding an allowable range, the fitting force between the hub bolt insertion hole 19 and the hub bolt 20 is weakened. For this reason, when the hub bolt 20 is tightened with the hub nut 21, the hub bolt 20 slips in the circumferential direction of the hub bolt insertion hole 19, and the wheel 16 and the braking member 17 can be fixed to the flange 18 with a required tightening torque. It becomes difficult.
In order to prevent such problems, conventionally, the diameter of the hub bolt insertion hole is measured, and after confirming that there is no machining error exceeding the allowable range in the hub bolt insertion hole, press the hub bolt into the hub bolt insertion hole. Yes.

According to such a method, it is possible to fix the wheel and the braking member to the hub with a required tightening torque. However, since it is necessary to check the diameter of the hub bolt insertion hole one by one, a lot of work is required. There was a problem.
The present invention has been made paying attention to such problems, and it is possible to fix a wheel or a braking member to a flange formed on the outer peripheral surface of a rotating wheel with a required tightening torque without requiring much trouble. An object of the present invention is to provide a wheel bearing device and a method for manufacturing the same.

  In order to achieve the above object, the invention according to claim 1 is directed to a stationary wheel having a rolling element track on one of an inner peripheral surface and an outer peripheral surface, and a rolling element track facing the rolling element track of the stationary wheel. Alternatively, a rotating wheel provided on one of the inner peripheral surfaces, a large number of rolling elements provided in a freely rolling manner between the rolling element tracks of the stationary wheel and the rotating wheel, and a flange formed on the outer peripheral surface of the rotating wheel, A wheel bearing device comprising a plurality of hub bolts press-fitted into a hub bolt insertion hole formed in the flange, wherein at least a part of the head portion of the hub bolt is noncircular.

  According to the second aspect of the present invention, there is provided a stationary wheel having a rolling element track on one of an inner peripheral surface and an outer peripheral surface, and a rotating wheel having a rolling element track facing the rolling element track of the stationary wheel on one of the outer peripheral surface and the inner peripheral surface. A ring, a large number of rolling elements provided in a freely rolling manner between the rolling element tracks of the stationary wheel and the rotating wheel, a flange formed on the outer peripheral surface of the rotating wheel, and a hub bolt drilled in the flange A wheel bearing device manufacturing method comprising a plurality of hub bolts press-fitted into an insertion hole, wherein the hub bolt torque is checked simultaneously with the hub-bolt press-fitting step.

  According to the present invention, since the fitting force between the hub bolt insertion hole and the hub bolt can be checked without measuring the diameter of the hub bolt insertion hole one by one, the wheel or braking member is attached to the flange formed on the outer peripheral surface of the rotating wheel. It can be fixed with a required tightening torque without much labor.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same parts as those shown in FIG. 11 are denoted by the same reference numerals, and detailed description thereof will be omitted.
FIG. 1 is a cross-sectional view showing a main part of a wheel bearing device according to a first embodiment of the present invention. As shown in the figure, a wheel 16 and a braking member 17 are provided on an outer peripheral surface of a hub 13. A flange 18 for attachment to the hub 13 is formed. A plurality of hub bolt insertion holes 19 are bored in the flange 18 at a constant pitch in the circumferential direction of the flange 18, and the wheel 16 and the brake member rotor 17 are inserted into the hub bolt insertion hole 19 by a hub nut 20 with a hub nut 21. It is fixed to the flange 18 by tightening.

As shown in FIG. 2, the hub bolt 20 includes a screw portion 201 press-fitted into the hub bolt insertion hole 19, a head portion 202 formed on one end side of the screw portion 201, and the head portion 202 and the screw portion 201. It is comprised from the axial part 203 formed between.
The head portion 202 of the hub bolt 20 has a circular seating surface portion 202a at the end opposite to the screw portion 201. As shown in FIG. 3, a hexagonal concave portion is formed at the center of the seating surface portion 202a. 26 is formed.
FIG. 4 is a view showing an example of a torque measuring jig used for checking the fitting force between the hub bolt insertion hole and the hub bolt. As shown in FIG. 4, the torque measuring jig formed in a cylindrical shape is shown. 27 is provided with a hexagonal convex portion 28 that fits into a concave portion 26 (see FIG. 2) formed on the head seat surface of the hub bolt.

  When checking the fitting force between the hub bolt insertion hole 19 and the hub bolt 20 using such a torque measuring jig 27, for example, the hub bolt 20 is press-fitted into the hub bolt insertion hole 19 as shown in FIG. To do. Next, as shown in FIG. 5 (b), the convex portion 28 provided on the tip end surface 27 a of the torque measuring jig 27 is inserted into the concave portion 26 formed in the central portion of the head of the hub bolt 20, and both are fitted. Then, rotational torque is applied to the torque measuring jig 27 until the hub bolt 20 press-fitted into the hub bolt insertion hole 19 slips in the circumferential direction. And the fitting force of the hub bolt insertion hole 19 and the hub bolt 20 can be checked by measuring the torque at that time with a torque measuring device (not shown).

Therefore, in the above-described embodiment, the fitting force between the hub bolt insertion hole 19 and the hub bolt 20 can be checked simultaneously with the press-fitting process of the hub bolt 20 without measuring the hole diameter of the hub bolt insertion hole 19 one by one. Further, the wheel 16 and the braking member 17 can be fixed to the flange 18 formed on the outer peripheral surface of the hub 13 with a required tightening torque without requiring much labor.
In the embodiment shown in FIG. 1, the example in which the present invention is applied to a wheel bearing device in which the outer ring is a stationary ring and the inner ring is a rotating ring is shown, but the present invention is not limited to this. However, the present invention can also be applied to a bearing device for a stationary wheel.

  In the embodiment shown in FIG. 5, after the hub bolt 20 is press-fitted into the hub bolt insertion hole 19, the convex portion 28 provided on the tip surface of the torque measuring jig 27 is formed in the concave portion formed on the head seat surface of the hub bolt 20. 26, the fitting force between the hub bolt insertion hole 19 and the hub bolt 20 is checked. However, the torque measurement jig 27 can also be used as a hub bolt press-fitting jig. After fitting the convex portion 28 of the use and press fitting jig 27 into the concave portion 26 of the hub bolt 20, the hub bolt 20 is press-fitted into the hub bolt insertion hole 19 to check the fitting force between the hub bolt insertion hole 19 and the hub bolt 20. May be. In this case, the press-fitting process and the torque measurement process can be performed simultaneously, which is efficient.

  Further, in the embodiment shown in FIG. 5, the convex portion 28 provided on the tip end surface 27a of the torque measuring jig 27 is fitted into the concave portion 26 formed on the head of the hub bolt 20, so that the hub bolt insertion hole 19 and the hub bolt are fitted. As shown in FIG. 6, a cylindrical convex portion 29 is provided at the center of the hub bolt head portion 202, and the twelve formed on the end surface portion of the convex portion 29 is checked. The convex portion 28 of the torque measuring jig 27 may be fitted into the rectangular concave portion 30 to check the fitting force between the hub bolt insertion hole 19 and the hub bolt 20.

  Furthermore, in the embodiment shown in FIG. 5, a square convex portion 28 is formed on the tip end surface 27 a of the torque measuring jig 27 to check the fitting force between the hub bolt insertion hole 19 and the hub bolt 20. As shown in FIG. 7, a square-shaped recess 31 is formed in the tip surface 27a of the torque measuring jig 27, and the hub bolt head 202 is formed in a square shape such as a hexagon (see FIG. 8). The fitting force between the hub bolt insertion hole 19 and the hub bolt 20 may be checked.

  In the embodiment shown in FIG. 8, the head 202 of the hub bolt 20 is formed in a square shape such as a hexagon, and the fitting force between the hub bolt insertion hole 19 and the hub bolt 20 is checked. It is not always necessary to form a square shape, and as shown in FIG. 9, it is possible to check the fitting force between the hub bolt insertion hole 19 and the hub bolt 20 by forming the head shape of the hub bolt 20 into a non-circular shape. . Thus, by making a part of the head of the hub bolt 20 non-circular, the fitting force between the hub bolt insertion hole 19 and the hub bolt 20 can be checked.

In each of the above-described embodiments, torque in the rotational direction is applied to the hub bolt 20 press-fitted into the hub bolt insertion hole 19 to check the fitting force between the hub bolt insertion hole 19 and the hub bolt 20. A load may be applied to the hub bolt 20 to check the fitting force between the hub bolt insertion hole 19 and the hub bolt 20. Alternatively, both the torque in the rotational direction and the load in the removal direction may be applied to the hub bolt 20 to check the fitting force between the hub bolt insertion hole 19 and the hub bolt 20.
In the embodiment shown in FIG. 1, an example in which the outer peripheral surface of the stationary wheel 11 has the knuckle mounting flange 22 is illustrated, but the present invention is not limited to this, and as shown in FIG. The present invention can also be applied to a wheel bearing device that does not have a knuckle mounting flange on its surface.

It is sectional drawing which shows the principal part of the wheel bearing apparatus which is the 1st Embodiment of this invention. It is a side view of the hub bolt shown in FIG. It is a top view of the hub bolt head shown in FIG. It is a figure which shows an example of the jig | tool for torque measurement used when checking the fitting force of a hub bolt insertion hole and a hub bolt. It is explanatory drawing for demonstrating the method to check the fitting force of a hub bolt insertion hole and a hub bolt using the jig | tool for torque measurement shown in FIG. It is a figure for demonstrating the 2nd Embodiment of this invention, (a) is a side view of a hub bolt, (b) is a top view of a hub bolt head. It is a figure for demonstrating the 3rd Embodiment of this invention, (a) is a figure which shows the front-end | tip part of the jig | tool for torque measurement, (b) is a figure which shows the front end surface of the jig | tool for torque measurement. It is a figure for demonstrating the 3rd Embodiment of this invention, (a) is a side view of a hub bolt, (b) is a top view of a hub bolt head. It is a figure for demonstrating the 4th Embodiment of this invention, (a) is a side view of a hub bolt, (b) is a top view of a hub bolt head. It is a fragmentary sectional view of the bearing device for wheels which does not have a stationary ring flange. It is sectional drawing which shows schematic structure of the bearing apparatus for wheels.

Explanation of symbols

11 Stationary wheel 12 Rolling body raceway groove 13 Rotating wheel (hub)
DESCRIPTION OF SYMBOLS 14 Rolling body raceway groove 15 Rolling body 16 Wheel 17 Braking member 18 Flange 19 Hub bolt insertion hole 20 Hub bolt 201 Screw part 202 Head 203 Shaft part 21 Hub nut 22 Flange 23 Knuckle 26 Concave part 27 Jig for torque measurement 28 Convex part 29 Convex part 30 recess 31 recess

Claims (2)

A stationary wheel having a rolling element track on one of the inner peripheral surface or the outer peripheral surface, a rotating wheel having a rolling element track opposite to the rolling element track of the stationary wheel on one of the outer peripheral surface or the inner peripheral surface, the stationary wheel, and A large number of rolling elements provided between the rolling element raceways of a rotating wheel, a flange formed on the outer peripheral surface of the rotating wheel, and a plurality of press-fitted into hub bolt insertion holes formed in the flange. A wheel bearing device comprising:
A wheel bearing device, wherein at least a part of a head of the hub bolt is non-circular. A stationary wheel having a rolling element track on one of the inner peripheral surface or the outer peripheral surface, a rotating wheel having a rolling element track opposite to the rolling element track of the stationary wheel on one of the outer peripheral surface or the inner peripheral surface, the stationary wheel, and A large number of rolling elements provided between the rolling element raceways of a rotating wheel, a flange formed on the outer peripheral surface of the rotating wheel, and a plurality of press-fitted into hub bolt insertion holes formed in the flange. A wheel bearing device manufacturing method comprising: a hub bolt, wherein the hub bolt torque is checked simultaneously with the hub bolt press-fitting step.

Images