JP2007322280A - Inspection apparatus and inspection method for bearing device for wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inspection apparatus and an inspection method for a bearing device for a wheel for detecting the insufficiency of rolling elements after an assembling process, preventing a defective product from being mounted to a vehicle, and ensuring the stability for running the vehicle. <P>SOLUTION: The inspection apparatus and the inspection method for the bearing device for the wheel, the bearing device including a hub wheel 1 having a flange 4 radially and outwardly extended, and a bearing structure 2 fitted to an exterior of the hub wheel 1. A measurement means 32 measures the deflection of the hub wheel 1 during rotation in a state that the hub wheel 1 and the bearing structure 2 are assembled. A frequency analyzing means 33 obtains the amplitude of a revolution period of the rolling element 5 in the bearing structure 2 based on a measurement value from the measurement means 32. The defective product is determined from the amplitude obtained by the frequency analyzing means 33 and exceeding a preset reference value. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an inspection device and an inspection method for a wheel bearing device.

  As shown in FIG. 6, the wheel bearing device includes a hub wheel 1 having a flange 4 extending in the outer diameter direction, and a bearing structure portion 2 that is fitted onto the hub wheel 1. The hub wheel 1 includes a shaft portion 3 and the flange 4 protruding from the shaft portion 3.

  The bearing structure portion 2 includes a ball 5 as a rolling element, an outer member (outer ring) 6 disposed on the outer peripheral side of the shaft portion 3 of the hub wheel 1 via the ball 5, and a shaft portion of the hub wheel 1. 3 and an inner ring 8 fitted on the notch recess 7.

  An inner first track 10 is provided on the outer peripheral surface of the shaft portion 3 of the hub wheel 1, an inner second track 11 is provided on the outer peripheral surface of the inner ring 8, and two rows are provided on the inner peripheral surface of the outer member 6. Tracks 12 and 13 are provided. The inner first track 10 of the hub wheel 1 and the outer first track 12 of the outer member 6 face each other, and the inner second track 11 of the inner ring 8 and the outer second track 13 of the outer member 6 face each other. The ball 5 is interposed between them. The ball 5 is held by cages (cages) 14 and 15.

  A pilot 16 is formed on the end surface of the shaft portion 3 of the hub wheel 1 (the end surface on the side opposite to the bearing structure) to which a brake rotor (not shown) is externally fitted. A mounting hole 17 is provided in the flange 4 along the circumferential direction, and a hub bolt 18 is mounted in the mounting hole 17. That is, a brake rotor or the like is superimposed on an end surface (end surface on the side opposite to the bearing structure) 19 of the flange 4 and fixed by the hub bolt 18.

  The end of the shaft 3 opposite to the flange is crimped, and the inner ring 8 is fastened to the shaft 3. Further, the outer member 6 is provided with a flange 20 having a screw hole 21 into which a vehicle body mounting bolt member (not shown) is screwed.

  By the way, the wheel bearing device is an important safety part, and in a vehicle in which the wheel bearing device having a poor quality is used, it is not possible to ensure traveling stability.

  Therefore, conventionally, there is a load measuring device for ensuring the traveling safety of the vehicle by detecting the load applied to the bearing structure portion in such a wheel bearing device (Patent Document 1).

  In the measuring method using the measuring device described in Patent Document 1, first, a known load is applied to the hub while rotating the hub to measure the revolution speed of the rolling element. Then, based on the measurement result and the known load value, a zero point and a gain characteristic used when calculating the load applied to the hub based on the revolution speed are obtained. Then, the obtained zero and gain characteristics are stored in a wireless IC tag or the like, and after assembling to the vehicle, the zero and gain characteristics are obtained, and the obtained zero and gain characteristics are used as reference values (the wireless Compared with the zero point and gain characteristics stored in the IC tag or the like, the pass / fail judgment is performed.

That is, it is determined whether or not the revolution speed actually measured by the revolution speed detection sensor is within an allowable range with respect to the revolution speed of the rolling element calculated from the rotation speed of the hub and the magnitude of the load. Thus, the load acting between the outer ring and the hub is obtained.
JP-A-2005-140606

  By the way, a serious problem in the wheel bearing device is caused by an insufficient number of balls (rolling elements). That is, when the number of rolling elements is insufficient, the ball revolution period is disturbed, and the non-repetitive run out (NRRO) is lost.

  Therefore, it was necessary to detect the shortage of rolling elements after assembly. However, the measuring device described in Patent Document 1 cannot detect a shortage of the number of rolling elements after assembly.

  In view of the above-described problems, the present invention provides a wheel bearing device that can detect a shortage of rolling elements after an assembly process, eliminates the need for mounting defective products on a vehicle, and ensures the running stability of the vehicle.

  The wheel bearing device of the present invention is an inspection device for a wheel bearing device comprising a hub ring having a flange extending in an outer diameter direction and a bearing structure portion fitted on the hub ring, wherein the hub wheel Measuring means for measuring the vibration of the hub wheel during rotation with the bearing structure assembled, and the amplitude of the revolution period of the rolling element of the bearing structure from the vibration of the hub ring measured by the measuring means Frequency analysis means.

  According to the wheel bearing device of the present invention, the vibration of the hub wheel during rotation in a state where the hub wheel and the bearing structure are assembled can be measured by the measuring means. Further, the frequency analyzing means can determine the amplitude of the revolution period of the rolling elements of the bearing structure portion from the vibration of the hub wheel measured by the measuring means. That is, if the number of rolling elements is small, the amplitude of the revolution cycle becomes large. For this reason, it turns out that the rolling element shortage used as the inferior goods has arisen by calculating | requiring the amplitude of this revolution period.

  An inspection method for a wheel bearing device according to the present invention is an inspection method for a wheel bearing device including a hub wheel having a flange extending in an outer diameter direction, and a bearing structure portion fitted on the hub wheel. The vibration of the hub ring during rotation with the hub ring and the bearing structure part assembled is measured, and the amplitude of the revolution period of the rolling element of the bearing structure part is obtained based on this measurement, and this amplitude is the set reference value. Products that exceed the limit are considered defective products.

  According to the method for inspecting a wheel bearing device of the present invention, a rolling element whose amplitude of the revolution period of the rolling element obtained based on the vibration of the hub wheel exceeds a set reference value is regarded as a defective product. A shortage of rolling elements with an increased period amplitude can be regarded as a defective product.

  According to the inspection apparatus for a wheel bearing device of the present invention, the vibration of the hub ring is measured by the measuring means, and the amplitude of the revolution period of the rolling element of the bearing structure portion is determined from the vibration of the hub ring by the frequency analyzing means, Thereby, it turns out that the rolling element shortage used as the inferior goods has arisen. That is, after assembly, the rolling element shortage can be inspected, such defective products are not mounted on the vehicle, and the running stability of the vehicle can be ensured.

  According to the method for inspecting a wheel bearing device of the present invention, a shortage of rolling elements in which the amplitude of the revolution period of the rolling elements is large can be regarded as a defective product. For this reason, it is possible to detect a defective product having insufficient rolling elements with high accuracy and to avoid the use of a product having inferior non-repetitive accuracy.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

FIG. 1 shows an inspection device for a wheel bearing device according to the present invention. This inspection device measures a swing of a support means 31 for rotatably supporting a wheel bearing device 30 and a hub wheel 1 of the wheel bearing device 30. Measuring means 32 that performs the measurement, and frequency analysis means 33 that obtains the amplitude of the revolution period of the rolling element 5 of the bearing structure 2 from the vibration of the hub wheel 1 measured by the measuring means 32. Since the wheel bearing device 30 to be inspected by this inspection device has the same structure as the wheel bearing device shown in FIG. 6, the same reference numerals as those in FIG.

  The support means 31 includes a base 35 and a rotating body 36 that is fixed to the hub wheel 1 of the wheel bearing device 30. The base 35 is formed of a disc body having an axial hole 37, and the flange 20 of the outer ring (outer member) 6 of the wheel bearing device 30 is placed thereon. At this time, in the wheel bearing device 30, the protrusion 38 on the side opposite to the rotating body with respect to the flange 20 of the outer ring 6 is fitted into the shaft hole 37 of the base 35.

  The rotating body 36 is formed of a disc body having a hole 40 in which the pilot 16 is fitted, and is placed on the end surface 19, and the fixing holes 41 are arranged at a predetermined pitch (same pitch as the hub bolt 18) along the circumferential direction. Has been. That is, when the rotating body 36 is placed on the end surface 19, the hub bolt 18 is fitted into the fixing hole 41 and positioned.

  Further, when the surface of the rotating body 36 is a smooth surface, by using the rotating body 36 having a smooth surface as a sensor target, a vibration component due to bolt press-fitting of the hub flange 19 can be eliminated, and measurement and determination accuracy can be reduced. Will improve. The rotating body 36 can be driven to rotate around its axis by a rotation driving mechanism (not shown) (for example, a motor). And if this rotary body 36 rotates, a rotational torque will be transmitted to the hub wheel 1 via the hub volt | bolt 18, and the hub wheel 1 will rotate around the shaft center.

  The measuring means 32 can be configured by a displacement sensor 45 that detects the deflection of the flange 4 of the hub wheel 1 during rotation. Here, the displacement sensor can measure a minute movement amount (displacement amount) when the object moves from a certain position, and can measure vibration, movement amount, and the like. There are various types of displacement sensors such as eddy current type, capacitance type, differential transformer, laser type, optical fiber type, wire type, and magnetostrictive line type. For this reason, in this embodiment, it can be arbitrarily selected from these various displacement sensors.

  Data (vibration) detected by the measuring means 32 is input to an analyzer 42 which is a frequency analyzing means 33. The analysis device 42 performs an operation for obtaining the amplitude of the revolution period of the rolling element 5 from the vibration (axial vibration) of the hub wheel 1 detected by the displacement sensor. In addition, a recorder 44 as a recording means 43 is connected to the analyzer 42, and a reference value for the amplitude of the revolution period of the rolling element 5 is input to the recorder 44. This reference value is a threshold value in FIG. 5, and if it exceeds this value, as in B, it is abnormal (bad), and if it is below this value, as in A, it is normal (good).

  Next, a method for inspecting a wheel bearing device using the inspection device will be described. First, the device under test (wheel bearing device 30) is supported by the support means 31, as shown in FIG. Then, in this state, the rotating body 36 is rotated by the driving means (not shown) to rotate the hub wheel 1.

  During this rotation, the axial vibration on the flange 4 of the hub wheel 1 is measured by the displacement sensor 45. Then, axial vibration data measured by the displacement sensor 45 is input to the analyzer 42, where the amplitude of the revolution period of the rolling element 5 is calculated. Further, the calculated amplitude of the revolution period of the rolling element 5 and the reference value (threshold value) input in advance to the recorder 44 are compared by this analyzer 42 or a comparator other than the analyzer 42. Then, it is determined whether the wheel bearing device 30 is normal or defective.

  That is, when the product is normal (the number n of missing rolling elements is 0), the flange deflection waveform is not disturbed as shown in the graph of the relationship between the flange deflection and the rotation angle shown in FIG. As shown in FIG. 3, when the non-defective product (the number n of missing rolling elements is 1), the waveform of the flange runout is disturbed. When the product is defective (the number n of missing rolling elements is 2), as shown in FIG. Further disturbed.

  For this reason, if the number of rolling elements is missing, the amplitude of the revolution period of the rolling elements 5 increases in accordance with the flange runout, and exceeds the set reference value of the amplitude. That is, if the amplitude obtained by the analyzer 42 exceeds the reference value, the number of rolling elements is smaller than that in the normal state.

  In the present invention, the vibration of the hub wheel 1 is measured by the measuring means 32, and the amplitude of the revolution period of the rolling element 5 of the bearing structure portion 2 is obtained from the vibration of the hub wheel 1 by the frequency analyzing means 33. It can be seen that there is a shortage of rolling elements that are good products. That is, after assembly, the rolling element shortage can be inspected, such defective products are not mounted on the vehicle, and the running stability of the vehicle can be ensured.

  As described above, it is possible to accurately detect a defective product having a shortage of rolling elements and reliably avoid the use of a product having poor non-repetitive accuracy.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, as a wheel bearing device, even for a driven wheel, a drive wheel May be used. In the embodiment, the rolling element 5 is constituted by a ball. However, a tapered roller may be used for the rolling element. Furthermore, as the wheel bearing device, in the embodiment, a raceway surface (rolling surface) is directly formed on the outer periphery of the hub wheel (referred to as a third generation), but a pair of inner rings are mounted on the hub wheel. (Press-fitted) (referred to as first generation or second generation), and further, formed with a raceway surface (rolling surface) directly on the outer periphery of the outer joint member of the hub wheel and constant velocity universal joint ( It may be a so-called fourth generation).

It is a simplification figure of the inspection device of the bearing device for wheels of the present invention. It is a graph which shows the flange runout and rotation angle in the test | inspection of the normal product which uses the said test | inspection apparatus. It is a graph which shows the flange runout and rotation angle in the inspection of the abnormal article which uses the said inspection apparatus. It is a graph which shows the flange runout and rotation angle in the inspection of the abnormal article which uses the said inspection apparatus. It is a graph which shows the threshold value of amplitude. It is sectional drawing of the bearing apparatus for wheels.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hub wheel 2 Bearing structure part 4 Flange 5 Rolling body 32 Measuring means 33 Frequency analysis means

Claims (2)

An inspection device for a wheel bearing device comprising a hub wheel having a flange extending in an outer diameter direction and a bearing structure portion fitted on the hub wheel,
Measuring means for measuring runout of the hub ring during rotation in a state where the hub ring and the bearing structure are assembled, and a revolution period of the rolling element of the bearing structure from the runout of the hub ring measured by the measurement means An inspection device for a wheel bearing device, comprising: frequency analysis means for obtaining an amplitude of the wheel. A method for inspecting a wheel bearing device including a hub ring having a flange extending in an outer diameter direction and a bearing structure portion fitted on the hub ring,
The vibration of the hub ring during rotation with the hub ring and the bearing structure part assembled is measured, and the amplitude of the revolution period of the rolling element of the bearing structure part is obtained based on this measurement. A method for inspecting a wheel bearing device, wherein a product exceeding the value is regarded as a defective product.

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