JP5484921B2 - RRO measuring device chuck runout accuracy measuring jig and runout accuracy judging method - Google Patents

Description

The present invention relates to a chuck runout accuracy measuring jig and a runout accuracy determining method of a wheel RRO measuring apparatus.

  When assembling a tire assembly by assembling a tire and a wheel in order to suppress vibration during driving and improve the ride comfort, generally, the maximum position of the primary component of the tire RFV (Radial Force Variation) and the wheel Assemble the RRO (radial run out) minimum position in phase.

  The RRO of the wheel is measured using an RRO measuring device. In this RRO measuring apparatus, a measurement for regular calibration is performed to determine whether or not the measurement error is within an allowable range. The conventional calibration measurement will be described with reference to FIG. 6 to FIG. 8. First, the direction orthogonal to the axial direction of the wheel support 56 among the runout of the rotation shaft (wheel support 56) of the RRO measurement device 50. As shown in FIG. 6, the tip of the magnescale M is brought into contact with the peripheral surface of the small-diameter portion 54a below the wheel support 56 from the side as shown in FIG. Actuate to rotate the wheel support 56. Then, the displacement width is calculated by the maximum value and the minimum value of the displacement amount of the magnescale M for each rotation, and this is performed a predetermined number of times. Depending on whether or not the average value of the displacement width is equal to or less than a predetermined threshold value, the wheel A determination is made as to whether or not the wheel runout of the wheel support 56 is related to a component in a direction orthogonal to the axial direction of the support 56.

  Further, as shown in FIG. 7, the measurement of the axial component shake of the wheel support 56 is performed by bringing the tip of the magnescale M into contact with the upper surface of the wheel support 56 from above, and using a drive device (not shown). Actuate to rotate the wheel support 56. Then, the displacement width is calculated from the maximum value and the minimum value of the displacement amount of the magnescale M per rotation, and this is performed a predetermined number of times, and whether or not the average value of the displacement width is equal to or less than a predetermined threshold value A determination is made as to whether or not the center shake of the wheel support portion 56 regarding the direction component is acceptable.

  As shown in FIG. 8, the center runout of the chuck 64 is measured by chucking the circular hole R1 of the doughnut disk-shaped mastering R with the chuck 64 and then laterally placing the tip of the magnescale M on the peripheral surface of the mastering R. The wheel support 56 is rotated by operating a driving device (not shown). Then, the displacement width is calculated from the maximum value and the minimum value of the displacement amount of the magnescale M at the phase angle of 0 degree, 90 degrees, 180 degrees, and 270 degrees every rotation, and this is performed a predetermined number of times, and the average of the displacement widths is calculated. Whether or not the center shake of the chuck 64 is acceptable is determined based on whether or not the value is equal to or less than a predetermined threshold value.

  For all three measurement items, if the measurement results are all equal to or less than the threshold value, the RRO measurement device 50 determines that the measurement error is within the allowable range and is directly used for measuring the RRO of the wheel. If the threshold value is exceeded, the RRO measuring device 50 is calibrated.

  Moreover, the thing of patent document 1 is mentioned as a thing regarding the attachment technique of the wheel to a wheel balance measuring apparatus. Patent Document 1 describes that a wheel is attached using a chuck device, and the centering of a rotating shaft, a disk wheel mounting base, and a center shaft is adjusted as adjustment of rotation balance.

JP 7-174656 A

  Among the three measurement items described with reference to FIGS. 6 to 8, in the measurement of the runout of the chuck 64 in FIG. 8, pass / fail is determined based on the displacement width of only one circumference on the peripheral surface of the mastering R. Therefore, the phenomenon of shaft runout (concentricity) parallel to the rotation axis can be analyzed, but the phenomenon of shaft runout (bias) with a tilt inclined with respect to the rotation axis cannot be analyzed. The latter phenomenon of shaft runout is mainly caused by wear of the outer surface of the projection 63 due to repeated engagement with the inner peripheral surface of the hub hole W1 of the wheel W, wear of the drive unit that operates each projection 63, and the like. To do.

  Therefore, there is a possibility that accurate calibration cannot be performed with the conventional calibration measurement method. For example, when a tire and a wheel are assembled using the technique described in the re-published patent WO2006 / 027960, the maximum position of the primary component of the RFV of the tire Error occurs when either phasing the minimum position of the wheel and RRO of the wheel or phasing the light spot position of the static unbalance of the tire and the emphasis position of the static unbalance of the wheel. There is a risk that a large unbalance occurs during typical wheel balance measurement, and it is necessary to attach a large number of weights for correction to the wheel.

  Even in the technique of Patent Document 1, since adjustment of the chuck device itself is not performed, there is a possibility that the adjustment of the rotation balance becomes insufficient.

The present invention was created in order to solve the above-described problems, and a jig for measuring the run-out accuracy of the chuck of the RRO measurement device capable of measuring the deviation degree of the chuck of the RRO measurement device and determining the run-out accuracy. It aims to provide a method.

In order to solve the above-mentioned problems, the present invention provides a rotating shaft connected to a driving device, a wheel support portion provided on an upper portion of the rotating shaft and abutting against a disk back surface of the wheel, and a concentrically enlarged diameter wheel. Runout of the chuck of the RRO measuring apparatus comprising: a mounting portion including a chuck that presses and grips the peripheral wall of the hub hole of the hub; and a measuring element that contacts the peripheral surface of the rim of the wheel. It is a jig for measuring accuracy , and is formed by connecting a circular part that is held by the chuck and follows the hub hole of the wheel in the center and the back surface is in contact with the wheel support part. A peripheral surface of the cylindrical portion corresponding to the position of the rim on the out side of the wheel, and a distal end side of the cylindrical portion corresponding to the position of the rim on the in side of the wheel. the peripheral surface, said measurement respectively Proximal measurement plane is brought into contact and is distal measurement plane is formed, the proximal measuring surface and distal measuring surface, respectively, a first measuring surface formed by a rim reference diameter of the wheel, aluminum wheels RRO It is characterized by comprising a second measurement surface formed with a threshold diameter and a third measurement surface formed with an RRO threshold diameter of the iron wheel .

  According to the accuracy measurement jig, the chuck includes two measurement surfaces that are separated from each other, which includes a base end measurement surface corresponding to the rim on the out side of the wheel and a tip measurement surface corresponding to the rim on the in side of the wheel. In addition to the concentricity of the axis, the degree of deviation with respect to the axis of the chuck can also be analyzed.

And according to the said precision measurement jig | tool, abnormality of the measuring element by the difference in a measurement range can be known with high precision.

Further, the present invention is a jig for measuring the accuracy of an RRO measuring device that measures the RRO by gripping the hub hole of the wheel with a chuck, and the circular hole that is gripped by the chuck and follows the hub hole of the wheel is in the center. And a cylindrical portion formed to be connected to the disk portion, the peripheral surface of the proximal end side of the cylindrical portion corresponding to the position of the rim on the outer side of the wheel, and the wheel Use an accuracy measurement jig in which a proximal measurement surface and a distal measurement surface are formed on the circumferential surface on the distal end side of the cylindrical portion corresponding to the position of the in-side rim, respectively, with which the probe of the RRO measurement device is brought into contact. A method of determining the accuracy of the runout of the chuck of the RRO measuring apparatus, wherein the accuracy measurement jig is held by the chuck and the measuring element is brought into contact with the base end measurement surface and the tip end measurement surface. Rotate the jig Measure the displacement of the proximal measurement surface and the displacement of the distal measurement surface several times for each preset phase angle, and from the measurement results, the proximal measurement surface and the distal measurement surface for the total number of measurements for each phase angle, Data D2 that is an average of the difference between the data D1, and data D5 that is a variation width of the data D1 when the average of the displacement between the proximal measurement surface and the distal measurement surface with respect to the total number of measurements for each phase angle is defined as data D1 , And a deviation degree with respect to the chuck axis is determined by comparing the data D2 with a reference value S1, and a concentricity of the chuck is determined by comparing the data D5 with a reference value S2. To do.

  According to the accuracy determination method, the chuck includes two measurement surfaces that are separated from each other, including a base end measurement surface corresponding to the rim on the out side of the wheel and a tip measurement surface corresponding to the rim on the in side of the wheel. Each pass / fail judgment of the concentricity and the degree of deviation with respect to the axis of the chuck can be performed with high accuracy.

  Further, according to the present invention, when the variation width data D3 of the displacement of the proximal end measurement surface at all phase angles exceeds the reference value S3 at two or more locations, or the variation width data of the displacement of the distal measurement surface at all phase angles. When D4 exceeds the reference value S4 at two or more locations, it is determined that the probe has an abnormality.

  According to the accuracy determination method, it is possible to know abnormalities of the probe with high accuracy by excluding sudden external factors.

  Further, according to the present invention, the proximal end measurement surface and the distal end measurement surface are respectively formed with a first measurement surface formed with a wheel rim reference diameter and a second RRO diameter with an aluminum wheel. It is composed of a measurement surface and a third measurement surface formed with the diameter of the RRO threshold of the iron wheel, and the data D2 is used as a reference for each of the first measurement surface, the second measurement surface, and the third measurement surface. The degree of deviation with respect to the axis of the chuck is determined by comparing with the value S1, and the concentricity of the chuck is determined by comparing the data D5 with the reference value S2.

  According to the accuracy determination method, the abnormality of the probe due to the difference in the measurement range can be known with high accuracy.

  According to the present invention, the phase alignment of the maximum position of the primary component of the tire RFV and the minimum position of the RRO of the wheel, or the light spot position of the tire static unbalance and the weighted position of the static unbalance of the wheel W An error in selecting any one of the phase alignments can be reduced. In addition, a large unbalance is measured at the time of final wheel balance measurement after assembly, and a situation in which a large number of weights are attached to the wheel for correction is avoided, and problems in terms of cost and appearance quality are reduced.

It is a side view which shows the precision measurement state of the RRO measuring apparatus using the precision measurement jig | tool which concerns on this invention. It is a sectional side view of a RRO measuring device, and shows the state where a chuck was closed. It is a sectional side view of a RRO measuring device, and shows the state where a chuck opened. It is a partial top view of a RRO measuring device. It is a side view which shows the RRO measurement state of the wheel by a RRO measuring device. It is a side view which shows the measurement state of the run-out regarding the component of the direction orthogonal to the axial direction of the rotating shaft of a RRO measuring apparatus. It is a side view which shows the measurement state of the runout regarding the component of the axial direction of the rotating shaft of a RRO measuring apparatus. It is a side view which shows the measurement state of the run-out of the conventional chuck | zipper. It is a data table which shows the example of a measurement result in phase angle 0 degree of the 1st measurement surface. It is a data table which shows data D1 for each phase angle of the 1st measurement surface, the 2nd measurement surface, and the 3rd measurement surface, and data D5 which is the variation width. It is a data table which shows the data D3 and D4 for every phase angle of a 1st measurement surface, a 2nd measurement surface, and a 3rd measurement surface.

  2 and 3, the RRO measuring device 50 is provided with a rotating shaft 51 connected to a driving device (not shown) such as a servo motor, and an upper portion of the rotating shaft 51. A wheel W (FIG. 5) is provided. And a cylindrical mounting portion 52 to be mounted. The mounting portion 52 is liquid-tightly fitted to the lower lid 53 at the lower end, the cylindrical cylinder tube 54 fitted in a liquid-tight manner to the periphery of the upper surface of the lower lid 53, and the upper end of the cylinder tube 54. An upper lid body 55, a wheel support portion 56 externally mounted on the upper portion of the upper lid body 55, and a piston 57 that moves up and down in a cylinder chamber 80 formed by the lower lid body 53, the cylinder tube 54, and the upper lid body 55. A piston rod 60 connected to the piston 57 and extending outwardly through the opening 58 formed in the upper lid body 55 and the opening 59 formed in the wheel support portion 56; and the upper surface of the upper lid body 55 And a guide portion 62 (see FIG. 4) that moves in the radial direction by being inserted into a plurality of sliding recesses 61 that are formed radially with respect to the axis of the piston rod 60 between the wheel support portion 56 and the lower surface (back surface) of the wheel support portion 56. Each) A chuck 64 formed of a protrusion 63 formed at the inner end of the guide portion 62, a guide pin 66 inserted through a guide hole 65 formed in the guide portion 62, and interposed between the guide pin 66 and the guide portion 62. And a spring member 67.

  The lower lid 53 that forms the lower wall of the cylinder chamber 80 is provided with a supply / exhaust passage 68 that communicates with the air chamber below the cylinder chamber 80 with the piston 57 interposed therebetween, thereby forming a side wall of the cylinder chamber 80. The cylinder tube 54 is provided with a supply / exhaust passage 69 communicating with the air chamber above the cylinder chamber 80 with the piston 57 interposed therebetween. The passage 69 passes through the lower lid 53 and faces the atmosphere. An exhaust through hole 70 is formed on the proximal end side of the guide hole 65 of the guide portion 62.

  The piston rod 60 includes a large-diameter portion 60a extending from the upper surface of the piston 57, a tapered portion 60b formed with a gradually decreasing diameter from the upper end of the large-diameter portion 60a, and an extended end from the upper end of the tapered portion 60b. A small-diameter portion 60c, a tip large-diameter portion 60d formed at the upper end of the small-diameter portion 60c, and a truncated cone portion 60e formed with a gradually reduced diameter from the upper end of the tip large-diameter portion 60d upward. It consists of a shape. An inner peripheral surface 63a of the protrusion 63 of the chuck 64 is formed as an arc surface having the same diameter as the small diameter portion 60c of the piston rod 60, and a tapered surface 63b facing the tapered portion 60b of the piston rod 60 is formed below the inner peripheral surface 63a. Is formed.

  As shown in FIG. 2, in a state where the piston rod 60 is retracted downward, the guide portions 62 are pressed inward by the elastic force of the spring member 67, the adjacent protrusions 63 come into contact with each other, and the protrusions 63. The inner peripheral surface 63a and the tapered surface 63b of the piston rod 60 are in contact with the small diameter portion 60c and the tapered portion 60b of the piston rod 60, and the outer peripheral surface of the projection 63 and the outer peripheral surface of the tip large diameter portion 60d of the piston rod 60 are smooth. It is in a state linked to. Then, when air is supplied to the cylinder chamber 80 through the passage 68, the piston 57 rises as shown in FIG. 3, and the taper portion 60b of the piston rod 60 projects against the elastic force of the spring member 67. By pressing the tapered surface 63b of the portion 63, the diameter of the chuck 64 is increased concentrically.

  When the RRO of the wheel W is measured by the RRO measuring device 50, as shown in FIG. 5, first, the hub hole W1 of the wheel W is passed through the large diameter portion 60d of the piston rod 60 and the wheel W on the wheel support portion 56. The disc back surface W2 is brought into contact. Then, as described with reference to FIG. 3, by supplying air to the cylinder chamber 80 through the passage 68, the piston 57 rises and the chuck 64 expands concentrically, and as shown in FIG. Is firmly gripped when the peripheral wall of the hub hole W1 is pressed against the outer peripheral surface of each projection 63, and is integrated with the mounting portion 52 coaxially. In this state, the measuring elements W4 and W5 are brought into contact with the peripheral surfaces of the rim W3 on the out side and the in side of the wheel W, and the mounting portion 52 is rotated via the rotating shaft 51 by a driving device (not shown). Measure RRO of W.

  The measurement for calibration of the RRO measuring device 50 is performed by the runout of the wheel support 56 relating to the component in the direction orthogonal to the axial direction of the wheel support 56 and the runout of the wheel support 56 relating to the axial component of the wheel support 56. The three items of the runout of the chuck 64 are performed. Among these, for the measurement of the previous two items, for example, the measurement is performed by the same procedure as the procedure described in the background art (measurement method of FIGS. 6 and 7).

  For measuring the runout of the chuck 64, a master rim 90 as an accuracy measuring jig according to the present invention is used as shown in FIG. 1 instead of the mastering R shown in FIG. The configuration of the master rim 90 includes a disk portion 91 corresponding to the disk surface W6 (see FIG. 5) of the wheel W, and a cylindrical portion 92 corresponding to the rim W3 (see FIG. 5) of the wheel W and connected to the disk portion 91. Become. A circular hole 93 corresponding to the hub hole W1 (see FIG. 5) of the wheel W is formed in the center of the disk portion 91. A proximal end measurement surface 40 is formed on the peripheral surface on the proximal end side of the cylindrical portion 92 located near the disk portion 91, and a distal end measurement surface 41 is formed on the peripheral surface on the distal end side of the cylindrical portion 92. . The formation position of the base end measurement surface 40 substantially corresponds to the position of the rim W3 on the out side (the upper side in FIG. 5) of the wheel W, and the formation position of the front end measurement surface 41 is the in side (the lower side in FIG. 5). Side) of the rim W3.

  In the present embodiment, the first measurement surface a, the second measurement surface b, and the third measurement surface c are formed sequentially at equal intervals from the respective end portions of the measurement surfaces of the proximal measurement surface 40 and the distal measurement surface 41. Consists of. The diameter of each first measurement surface a (RRO: 0.0) located closest to the end is manufactured with high accuracy so as to be the rim reference diameter of the wheel W (master rim 90), and each second measurement inside the first measurement surface a (RRO: 0.0). The surface b (RRO: 0.3) is a diameter that is a threshold value of the RRO of the aluminum wheel, and is manufactured with high accuracy, for example, a diameter that is 0.3 mm larger than the rim reference diameter. The surface c (RRO: 0.5) is a diameter that is a threshold value of the RRO of the iron wheel, and is manufactured with high accuracy, for example, a diameter that is larger by 0.5 mm than the rim reference diameter.

  In measuring the runout of the chuck 64, first, the circular hole 93 of the master rim 90 is passed through the large diameter portion 60d of the piston rod 60, and the disk portion rear surface 91a of the master rim 90 is brought into contact with the wheel support portion 56. Then, as described in FIG. 3, by supplying air from the passage 68 to the cylinder chamber 80, the piston 57 is raised and the chuck 64 is expanded in diameter, so that the circular hole 93 of the master rim 90 is formed as shown in FIG. The outer peripheral surface of the protrusion 63 is pressed against the peripheral wall, and the master rim 90 is held. In this state, measuring elements W4 and W5 such as a magnescale are brought into contact with any one of the pair of first measuring surface a, second measuring surface b, and third measuring surface c of the cylindrical portion 92 of the master rim 90, and a certain position. Is set to a position with a phase angle of 0 degrees on the circumference, and the mounting portion 52 is rotated by a driving device (servo motor) (not shown), and the phase angles of the first measurement surface a, the second measurement surface b, and the third measurement surface c The shake amounts of 0 degree, 90 degrees, 180 degrees, and 270 degrees are measured the same plurality of times, for example, 10 times.

  The measurement results of the RRO probe W4 and W5 are transmitted to the control device 100 and analyzed as shown in FIGS. 9 to 11, and the analysis results are displayed on the display device 101. The analysis results include data outside the allowable range. If there is, the alarm device 102 is activated to notify the operator that the RRO measuring device 50 is not normal (the RRO measuring device 50 needs a calibration check).

  FIG. 9 is a data table showing an example of measurement results at a phase angle of 0 degree on the first measurement surface a, the measurement data value A of the displacement of the first measurement surface a of the proximal measurement surface 40, and the first of the distal measurement surface 41. Measurement data value B of displacement of measurement surface a, average value C of both measurement data values, difference between both measurement data values A and B (difference value) D, data for 10 times of measurement and 4 items The average value for each 10 times and the variation width of the two measurement data values A and B are shown. The unit is millimeter. Here, the average of the average value C for 10 times (the average of the displacement of the base end measurement surface 40 and the tip end measurement surface 41 with respect to the total number of measurements for each phase angle) is the data D1, and the average of the difference D for 10 times is the data D2. The variation width of the measurement data value A (difference between the maximum value and the minimum value of the measurement data value A) is data D3, and the variation width of the measurement data value B (difference between the maximum value and the minimum value of the measurement data value B) is data D4. And For example, the RRO measuring device 50 has a pass / fail judgment standard in which the allowable value (reference value S1) of the data D2 is set to 0.07 mm, and when the measurement result exceeds the 0.07 mm reference value S1, the chuck 64 is rotated. As described above, the alarm device 102 is actuated to prompt the chuck 64 to be confirmed. FIG. 9 shows the case where the data D2 is within 0.018 mm which is equal to or less than the reference value S1.

  The measurement at the positions of the phase angle 90 degrees, 180 degrees, and 270 degrees on the first measurement surface a is performed in the same manner, and the phase angle 0 degree is similarly applied to the remaining second measurement surface b and third measurement surface c. , 90 degrees, 180 degrees, and 270 degrees are measured. Then, the data D1 for each phase angle of the first measurement surface a, the second measurement surface b, and the third measurement surface c and the data D5 that is the variation width (difference between the maximum value and the minimum value of the data D1) are extracted. To do. A table showing the extraction results is shown in FIG. Then, for example, when the RRO measuring apparatus 50 determines whether or not the acceptable value (reference value S2) of the data D5 in FIG. 10 is 0.07 mm and the measurement result exceeds the 0.07 mm reference value S2. Assuming that the concentricity with respect to the rotation axis of the chuck 64 is out of order, the alarm device 102 is operated as described above to prompt confirmation of the chuck 64. In FIG. 10, the data D5 of the first measurement surface a, the second measurement surface b, and the third measurement surface c are within 0.016 mm, 0.035 mm, and 0.022 mm, which are less than the reference value S2, respectively. Show.

  Further, the data D3 and D4 for each phase angle of the first measurement surface a, the second measurement surface b, and the third measurement surface c are extracted. FIG. 11 is a table showing the extraction results. In the present embodiment, when the variation width data D3 of the displacement of the proximal measurement surface 40 at all phase angles exceeds the reference value S3 at two or more locations, or the variation width of the displacement of the distal measurement surface 41 at all phase angles. When the data D4 exceeds the reference value S4 at two or more locations, it is determined that the measuring elements W4 and W5 are abnormal.

  For example, in FIG. 11, two or more data D3 among the four data D3 (the reference numerals D31, D32, D33, and D34 are attached) regarding the first measurement surface a of the base end measurement surface 40 are reference values. When S3 (for example, 0.007 mm) is exceeded, it is determined that the probe W4 is abnormal, the alarm device 102 is operated as described above, and confirmation / repair of the RRO probe W4 is urged. The same applies to the second measurement surface b and the third measurement surface c of the base end measurement surface 40. Of the four data D4 related to the first measurement surface a of the tip measurement surface 41 (the ones with the symbols D41, D42, D43, and D44), two or more data D4 have a reference value S4 (for example, 0. 0). 007 mm), it is determined that the probe W5 is abnormal, the alarm device 102 is activated as described above, and confirmation / repair of the RRO probe W5 is urged. The same applies to the second measurement surface b and the third measurement surface c of the tip measurement surface 41. Normally, the reference value S3 and the reference value S4 are the same numerical value.

  Thus, in this embodiment, “when the data D3 exceeds the reference value S3 at two or more locations” or “when the data D4 exceeds the reference value S4 at two or more locations” , Applied to each of the second measurement surface b and the third measurement surface c, all 12 locations of the first measurement surface a, the second measurement surface b, and the third measurement surface c of the proximal measurement surface 40. 2 or more of the data D3 exceeds the reference value S3, or the data D4 of all 12 locations of the first measurement surface a, the second measurement surface b, and the third measurement surface c of the tip measurement surface 41. It does not necessarily mean that two or more places exceed the reference value S4. For example, only one data D3 exceeds the reference value S3 on the first measurement surface a of the base end measurement surface 40, and similarly, data D3 on the second measurement surface b and the third measurement surface c of the base end measurement surface 40, respectively. If only one exceeds the reference value S3, the alarm device 102 is not activated.

  As described above, the disk portion 91 is formed in the center by the circular hole 93 that is gripped by the chuck 64 and follows the hub hole W1 of the wheel W, and the cylindrical portion 92 that is formed to be connected to the disk portion 91. To the peripheral surface on the proximal end side of the cylindrical portion 92 corresponding to the position of the rim W3 on the out side of the wheel W and the peripheral surface on the distal end side of the cylindrical portion 92 corresponding to the position of the rim W3 on the in side of the wheel W. According to the accuracy measurement jig (master rim 90) on which the proximal end measurement surface 40 and the distal end measurement surface 41 with which the measuring elements W4 and W5 of the RRO measurement device 50 abut, respectively, are formed, the rim on the out side of the wheel W In addition to the concentricity of the shaft of the chuck 64, the measurement surface includes two measurement surfaces that are spaced apart from each other, which includes a proximal measurement surface 40 corresponding to W3 and a distal measurement surface 41 corresponding to an inward rim W3 of the wheel W. Chuck 6 Also a measurement jig can be analyzed biasing of the relative to the axis.

  Further, as an accuracy determination method of the RRO measuring apparatus 50, the master rim 90 is gripped by the chuck 64, the measuring elements W4 and W5 are brought into contact with the proximal end measuring surface 40 and the distal end measuring surface 41, and the mounting portion 52 is rotated. Thus, the master rim 90 is rotated, and the displacement of the proximal measurement surface 40 and the displacement of the distal measurement surface 41 are changed a plurality of times for each preset phase angle (0, 90, 180, and 270 degrees in this embodiment). Based on the measurement results, data D2 that is the average of the difference between the base measurement surface 40 and the tip measurement surface 41 for the total number of measurements for each phase angle, and the base measurement surface 40 for the total number of measurements for each phase angle. And the data D5, which is the variation width of the data D1 when the average of the displacement between the tip and the tip measurement surface 41 is defined as data D1, and comparing the data D2 with the reference value S1, By determining the degree of deviation with respect to the line and comparing the data D5 with the reference value S2, the determination of the concentricity of the chuck 64 and the degree of deviation with respect to the axis of the chuck 64 is high. It can be done with accuracy.

  Therefore, according to the accuracy measuring jig (master rim 90) or the accuracy determining method according to the present invention, the RRO measuring device 50 is maintained with high accuracy, so that the RRO of the wheel W measured by the RRO measuring device 50 is maintained. The accuracy of the minimum position is improved. Thereby, the phase alignment of the maximum position of the primary component of the RFV of the tire and the minimum position of the RRO of the wheel W, or the phase alignment of the light spot position of the static unbalance of the tire and the priority position of the static unbalance of the wheel W is achieved. It is possible to reduce errors in selecting either of the above. In addition, a large unbalance is measured at the time of final wheel balance measurement after assembly, and a situation in which a large number of weights are attached to the wheel for correction is avoided, and problems in terms of cost and appearance quality are reduced.

  Further, in the accuracy measuring jig (master rim 90) according to the present invention, the base end measuring surface 40 and the tip measuring surface 41 are respectively formed with a first measuring surface a formed with a rim reference diameter of the wheel W and an aluminum wheel. The second measurement surface b formed with the diameter of the RRO threshold value and the third measurement surface c formed with the diameter of the RRO threshold value of the steel wheel, or these first measurement surfaces a, In each of the second measurement surface b and the third measurement surface c, the deviation degree with respect to the axis of the chuck 64 is determined by comparing the data D2 with the reference value S1, and the chuck 64 is determined by comparing the data D5 with the reference value S2. If the accuracy determination method is used to determine the concentricity, the abnormalities of the measuring elements W4 and W5 due to the difference in the measurement range can be known.

  That is, since each of the first measurement surface a, the second measurement surface b, and the third measurement surface c of the master rim 90 is manufactured with high accuracy as a master member, the degree of deviation of the first measurement surface a and If the concentricity is determined to be normal, the remaining second measurement surface b and third measurement surface c should be determined to be normal, but the accuracy of the sensor portions of the measuring elements W4 and W5 varies depending on the measurement range. In such a case, for example, even if the deviation and the concentricity are determined to be normal in the measurement range of the second measurement surface b formed with the diameter of the RRO threshold of the aluminum wheel, An event determined to be abnormal may occur in the measurement range of the third measurement surface c formed with the RRO threshold diameter. Accordingly, when the normal measurement results and the abnormal determination results of the first measurement surface a, the second measurement surface b, and the third measurement surface c are different as described above, the measurement is not performed by the chuck 64 but by the difference in the measurement range. It can be determined that the measurement functions of the children W4 and W5 are out of order.

  As another method for determining the abnormality of the probe W4, W5, as described above, when the data D3 of the variation width of the displacement of the base end measurement surface 40 at all the phase angles exceeds the reference value S3 at two or more locations. Alternatively, when the data D4 of the variation width of the displacement of the tip measurement surface at all the phase angles exceeds the reference value S4 at two or more locations, it can be assumed that the measuring elements W4 and W5 are abnormal. If the data D3 exceeds the reference value S3 at only one location, or if the data D4 exceeds the reference value S3 at only one location, the abnormal judgment criterion may reflect an unexpected external factor. By using two or more locations as abnormality determination criteria, sudden external factors can be excluded and abnormalities in the measuring elements W4 and W5 can be known with high accuracy.

  The preferred embodiments of the present invention have been described above. In the described embodiment, the proximal end measurement surface 40 and the distal end measurement surface 41 are measured using two measuring elements W4 and W5, respectively. However, for example, the proximal end measurement surface 40 and the distal end measurement surface 41 are measured with one measuring element W4. There is no problem even if both are measured.

40 base end measurement surface 41 tip measurement surface 50 RRO measurement device 64 chuck 90 master rim (accuracy measurement jig)
91 disk part 92 cylindrical part 93 circular hole a 1st measurement surface b 2nd measurement surface c 3rd measurement surface W wheel W1 hub hole W3 rim W4, W5 measuring element

Claims (4)

A rotating shaft connected to the drive device;
A mounting portion provided at an upper portion of the rotating shaft, and provided with a wheel support portion that contacts the disk back surface of the wheel, and a chuck that concentrically expands the diameter and presses and grips the peripheral wall of the wheel hub hole;
A probe that contacts the peripheral surface of the rim of the wheel;
A jig for measuring the runout accuracy of the chuck of an RRO measuring device configured to include:
A circular hole that is gripped by the chuck and that follows the hub hole of the wheel is formed in the center, and a back surface is configured to contact the wheel support portion, and a cylindrical portion that is formed to be connected to the disk portion.
The peripheral surface of the proximal end side of the cylindrical portion corresponding to the position of the out-side of the rim of the wheel, the peripheral surface of the distal end side of the cylindrical portion corresponding to the position of the in-side of the rim of the wheel, each said feeler A base end measurement surface and a tip measurement surface to be contacted are formed ,
The base end measurement surface and the front end measurement surface are respectively a first measurement surface formed with a wheel rim reference diameter, a second measurement surface formed with an aluminum wheel RRO threshold diameter, and an iron wheel. A jig for measuring the runout accuracy of a chuck of an RRO measuring apparatus, comprising a third measuring surface formed with a diameter of a threshold value of RRO . A jig for measuring the accuracy of an RRO measuring device that grips a hub hole of a wheel with a chuck and measures RRO,
It is composed of a disk part that is gripped by the chuck and is formed in the center with a circular hole that follows the hub hole of the wheel, and a cylindrical part that is formed to be connected to this disk part,
The RRO measuring device has a peripheral surface on the base end side of the cylindrical portion corresponding to the position of the rim on the out side of the wheel and a peripheral surface on the front end side of the cylindrical portion corresponding to the position of the rim on the in side of the wheel, respectively. A method of determining the runout accuracy of the chuck of the RRO measurement device using an accuracy measurement jig on which a base end measurement surface with which a probe is brought into contact and a tip measurement surface is formed ,
The accuracy measuring jig is gripped by the chuck, the measuring element is brought into contact with the base end measuring surface and the tip measuring surface, and the accuracy measuring jig is rotated,
Measure the displacement of the proximal measurement surface and the displacement of the distal measurement surface several times for each preset phase angle,
From the measurement results, data D2 that is the average of the difference between the proximal measurement surface and the distal measurement surface for the total number of measurements for each phase angle, and the proximal measurement surface and the distal measurement for the total number of measurements for each phase angle. Data D5, which is a variation width of the data D1 when the average displacement with respect to the surface is data D1,
An RRO measuring apparatus characterized in that a deviation degree with respect to an axis of the chuck is determined by comparing the data D2 with a reference value S1, and a concentricity of the chuck is determined by comparing the data D5 with a reference value S2. Chuck runout accuracy judgment method. When the variation width data D3 of the displacement of the base end measurement surface at all phase angles exceeds the reference value S3 at two or more locations, or when the variation width data D4 of the displacement of the tip measurement surface at all phase angles is two or more locations. when it exceeds the reference value S4, the chuck runout accuracy determination method of the RRO measurement apparatus according to claim 2, characterized in that determining that there is an abnormality in the measuring element. The base end measurement surface and the front end measurement surface are respectively a first measurement surface formed with a wheel rim reference diameter, a second measurement surface formed with an aluminum wheel RRO threshold diameter, and an iron wheel. And a third measurement surface formed with a diameter of a threshold value of RRO,
In each of the first measurement surface, the second measurement surface, and the third measurement surface, the deviation from the chuck axis is determined by comparing the data D2 with the reference value S1, and the data D5 is compared with the reference value S2. chuck runout accuracy determination method of the RRO measurement apparatus according to claim 2, characterized in that determining the concentricity of the chuck by.

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