JP5897835B2 - Measuring device - Google Patents

Description

  The present invention relates to an apparatus for measuring the state of a specimen under rotation.

  Conventionally, the balance is measured after manufacturing the wheel (see Patent Document 1 below). A specimen whose balance is not within the predetermined range is discarded or repaired.

  The balance is measured by measuring whether or not the balance is achieved by rotating the wheel and detecting the shake of the main spindle that rotates simultaneously. In order to detect the deflection of the main shaft, in Patent Document 1, a fixed column and a bearing are attached by a flat plate spring. When the main shaft swings, the bearing also swings and the swing is transmitted to the leaf spring. The displacement of the leaf spring is detected by a displacement (vibration) sensor or the like, and the unbalance amount of the wheel is obtained from the displacement.

  However, when a flat plate spring is used, tension is applied to the plate spring due to expansion and contraction of the main shaft, bearing, and bearing box and the frame constituting the machine due to changes in the ambient temperature distribution, and there is an error in the vibration detected by the displacement sensor. Arise. The term of tension in elastic mechanics and material mechanics is a term that can ignore the influence in the case of micro deflection. However, the machine is affected by this, and an error occurs even if the vibration is analyzed to determine the balance during rotation.

Japanese Patent Publication No.56-8288

  An object of the present invention is to provide a measuring apparatus with a small measurement error when measuring the state of the specimen under rotation.

  A measuring apparatus according to the present invention includes a fixed frame, a means for holding a specimen, a main shaft attached to the center of the holding means, a motor for rotating the main shaft, and a bearing for rotatably holding the main shaft. A first plate-like, strip-like, or linear elastic material for attaching the bearing to the fixed frame, and a second bent material for attaching the bearing to the fixed frame. A non-directional elastic material, a sensor for measuring displacement, acceleration or velocity of the first anisotropic material and the second elastic material, and measured by the sensor And an arithmetic unit that obtains the balance of the specimen from the displacement, acceleration, or speed.

  The rim pinches the object to be inspected. When the motor is driven, the power of the motor is transmitted to the rim through the main shaft. A first anisotropic elastic body and a second anisotropic elastic body are suspended from the fixed frame, and a bearing is suspended from each anisotropic elastic body. When the rim and the object to be inspected rotate, the main shaft will swing if the object to be inspected is not balanced. The bearings are also shaken in accordance with the deflection of the main shaft, and the positions of the first anisotropic elastic body and the second anisotropic elastic body are displaced. This displacement is measured by a sensor, and the calculation unit determines the balance of the object to be inspected.

  In addition to the first anisotropic elastic body and the second anisotropic elastic body, the plurality of anisotropic elastic bodies may be used as second anisotropic elastic bodies. It may be a body. The displacement of the second anisotropic elastic body is measured by a sensor.

  According to the present invention, in order to accurately calculate the unbalance amount (unbalance amount), the tilt (angle) vibration component and the translation (shift) vibration component included in the vibration component are integrated (linearly proportional). The relationship is obtained. In addition to the flat first anisotropic elastic body, a bent second anisotropic elastic body is used. The bent portion of the second anisotropic elastic body reduces the tension acting on the anisotropic elastic body (plate spring) by expansion and contraction of the main shaft, the bearing and the bearing box and the fixed frame constituting the machine due to the ambient temperature distribution. be able to. It is possible to measure the amplitude in which the excitation force is proportional to the repulsive force against the bending of the anisotropic elastic body. The second anisotropic elastic body and the fixed frame, the second anisotropic elastic body and the fixed position of the bearing are less likely to change, and the structure is less susceptible to internal heat generation and ambient temperature changes due to machine rotation. Error is less likely to occur. It is a measuring device with small measurement error. By making the sensor non-contact, measurement can be performed stably without being affected by mechanical friction.

It is a figure which shows the structure of the measuring device of this invention. FIG. 2 is an enlarged view of a bearing, an anisotropic elastic body, and a sensor of the measuring device of FIG. 1. It is a figure which shows an anti-vibration pad. It is a figure which shows the conveyor which conveys a to-be-tested object. It is a figure which shows transmission of the motive power of a motor. It is a figure which shows the anisotropic body of an anisotropy, (a) is a figure which shows the 1st anisotropy elastic body, (b) is a figure which shows the 2nd anisotropy elastic body. It is a figure which shows the displacement of the elastic body of an anisotropy, (a) is the displacement of the to-be-balanced specimen, (b) is the displacement of the to-be-examined specimen. (A) is a figure of the 1st anisotropical elastic body which provided the slit, (b) is the sectional view on the AA line of (a), (c) is providing a groove | channel instead of a slit. It is a figure. It is the figure which used the strip | belt-shaped 1st anisotropic body. (A) is a cross-sectional view of an anisotropic elastic body with a curved end, (b) is a cross-sectional view of an anisotropic elastic with a chamfered end, and (c) has a bulge. FIG. 6 is a cross-sectional view of a unidirectional elastic body. It is another figure of the elastic body of the 2nd anisotropic direction, (a) is the figure which made the bending part the triangle, (b) is the figure which made the bending part the curve, (c) is the bending part. Is a view folded in two directions. It is a figure of the 2nd anisotropically elastic body which made the bending frequency | count twice.

  The measurement apparatus of the present invention will be described with reference to the drawings. The specimen to be measured for balance is a circular body or a ring body, and the material may be a metal material, rubber or plastic, or a cavity may be formed inside. Hereinafter, the specimen 14 will be described by taking a ring body as an example.

  1 and 2 includes a fixed frame 12, a rim 16 that sandwiches and holds a specimen 14, a main shaft 18 attached to the center of the rim 16, a motor 20 that rotates the main shaft 18, and a main shaft 18 that rotates. A bearing 22 that can be held, a two-type elastic material 24a, 24b that suspends the bearing 22 with respect to the fixed frame 12, and a sensor 26 that measures the displacement of each elastic material 24a, 24b with different direction. And a calculation unit 28 for obtaining the balance of the DUT 14 from the measured displacement.

  The fixed frame 12 is a frame for installing the measuring device 10 on the floor or the ground. The fixed frame 12 is a combination of frames formed of steel material in the vertical, horizontal, and depth directions. Parts constituting the measuring device 10 are attached to the fixed frame 12.

  An anti-vibration pad 30 made of a flexible material such as rubber is disposed between the fixed frame 12 and the floor or the ground (FIG. 3). The anti-vibration pad 30 absorbs the vibration of the fixed frame 12 when the rim 16 rotates. The position of the fixed frame 12 does not change. The anti-vibration pad 30 has two types of protrusions 34 a and 34 b arranged on a sheet 32. The protrusions 34a and 34b are cylinders having different diameters and heights, have non-directional non-linear spring characteristics, disperse natural frequencies, suppress amplitude peaks, and install the fixed frame 12 on the floor or the ground. No foundation work is required to do this.

  The rim 16 includes a circular upper rim 36a, a circular lower rim 36b, and a locking mechanism 38 for the upper rim 36a and the lower rim 36b. The upper rim 36a and the lower rim 36b have the same shape and are arranged to face each other. The upper rim 36a and the lower rim 36b are stacked so as to change from a rim having a large diameter to a small rim, and are stepped. There is no need to change the rim 16 even if the size of the specimen 14 is different.

  The upper rim 36a and the lower rim 36b are sandwiched so as to press down the inner peripheral portion (bead portion) of the specimen 14 to be tested. The upper rim 36a and the lower rim 36b are integrated by a lock mechanism 38, and perform the same function as a wheel rim of a normal vehicle. A sealed space is formed by the upper rim 36 a, the lower rim 36 b, and the specimen 14, and air can be introduced into the specimen 14.

  A pump is provided that inserts air into the specimen 14 from the air inlet / outlet of the rim 16 after the specimen 14 is sandwiched between the upper rim 36a and the lower rim 36b. The air is injected so that the pressure is determined by the type of the specimen 14 to be tested. After measuring the balance of the specimen 14, a bead breaker for holding the inner peripheral portion of the specimen 14 or the vicinity thereof and removing the specimen 14 from the rim 16 is provided.

  Further, in order to move the upper rim 36 a up and down, an upper rim vertical drive servomotor 40, an arm 42 that moves up and down by driving the upper rim vertical drive servomotor 40, and a chuck 44 provided at the tip of the arm 42 are provided. An example of the chuck 44 is an air chuck. The upper rim 36 a is held on the arm 42 via the chuck 44. When the upper rim vertical drive servomotor 40 is driven, the upper rim 36a is raised or lowered.

  Prior to measuring the balance, the upper rim 36a descends and sandwiches the specimen 14 to be tested. When measuring the balance, the upper rim 36 a is released from the chuck 44. When the measurement of the balance is completed, the chuck 44 holds the upper rim 36a, and the arm 42 is raised, so that the upper rim 36a is raised.

  The rim 16 has a circular shape, and a main shaft 18 is attached to the center thereof. The main rim 18 is attached to the lower rim 36b. When the main shaft 18 is rotated by the motor 20, the lower rim 16b also rotates. When the upper rim 36a and the lower rim 36b are integrated by the lock mechanism 38 with the DUT 14 sandwiched therebetween, the upper rim 36a, the lower rim 36b, and the DUT 14 rotate together by the rotation of the lower rim 36b. .

  A conveyor 46 is provided that conveys the specimen 14 to a position where the rim 16 is located and carries the specimen 14 out of the position where the rim 16 is located (FIG. 4). Examples of the conveyor 46 include a roller conveyor. In the conveyor 46, rollers 48 are arranged in two rows along the conveying direction. A device for changing the interval between the columns is provided so that the interval between the columns can be changed in accordance with the size of the specimen 14.

  A sensor for detecting that the inner peripheral portion of the specimen 14 has been transported to the position where the rim 16 is disposed is provided. For example, the specimen 14 is detected by an optical sensor or the like in a non-contact manner. When the specimen 14 is detected by the sensor, the conveyor 46 is stopped. The rim 16 is arranged at the center of the rollers 48 arranged in two rows, and includes an arm for moving the specimen 14 to the center.

  The surface of the roller 48 around the rim 16 is subjected to friction reduction processing. FIG. 4 shows a roller 48 that has been hatched and subjected to low friction processing. For example, a tape based on fluororesin or ultra high molecular weight polyethylene is applied to the surface of the roller 48, or the fluororesin or ultra high molecular weight polyethylene is applied to the surface of the roller 48 and dried to generate on the surface of the roller 48. Reduce friction. This is because the rim 16 is arranged at the center of the rollers 48 arranged in two rows so that the rotation axis of the rim 16 and the core of the specimen 14 can be easily aligned. In addition, the life of the roller 48 can be extended by reducing the friction. Materials other than the surface of the roller 48 are not limited.

  The friction reduction processing is performed in order to move the specimen 14 around the position before being transported to the rim 16, or to mark an unbalanced position on the specimen 14 after unloading from the rim 16. This is also applied to a roller 48 that moves around the position 14. In FIG. 4, the rollers 48 are hatched on both sides.

  A device for raising and lowering the conveyor 46 is provided. When measuring the balance of the DUT 14, the conveyor 46 is lowered so as not to interfere with the balance measurement. After the balance measurement, the conveyor 46 is raised to carry out the specimen 14.

  The motor 20 is fixed to the fixed frame 12. When the motor 20 is driven, the main shaft 18 rotates about the central shaft 50. In order to transmit the power of the motor 20 to the main shaft 18, the timing pulley 52 attached to the main shaft 18, the timing pulley 56 attached to the rotating shaft 54 of the motor 20, and the timing stretched from the timing pulley 52 to the timing pulley 56 A belt 58 is provided (FIG. 5). The center of the timing pulley 52 and the center axis 50 of the main shaft coincide with each other, and the rotation shaft 54 of the motor 20 and the center of the timing pulley 56 coincide with each other.

  The timing belt 58 is endless and circulates between the timing pulley 52 and the timing pulley 56. When the motor 20 is driven, power is transmitted from the timing pulley 56 to the timing pulley 52 via the timing belt 58, and the main shaft 18 rotates.

  The timing belt 58 is tensioned by the tension roller 60. Even if the timing belt 58 expands and contracts due to a change in the ambient temperature distribution, the load on the main shaft 18 can be kept constant. It is also possible to prevent drift when the timing belt 58 circulates. The number of teeth of the timing pulley 52 is greater than the number of teeth of the timing pulley 56, and the rotational speed of the main shaft 18 is reduced compared to the rotational speed of the motor 20. The number of teeth may be changed as appropriate according to the rotational speed of the specimen 14.

  The ratio of the rotational speeds of the timing pulley 52 and the timing pulley 56 is an integral multiple. When the timing pulley 52 makes one rotation, the timing pulley 56 is rotated by an integral multiple thereof. During balance measurement, noise due to driving of the motor system 20 can be canceled.

  The bearing 22 has a cylindrical shape, and a part of the main shaft 18 is accommodated therein. The main shaft 18 and the bearing 22 face the direction of the earth's gravity. Bearings 62 are provided at both ends of the bearing 22. A bearing 62 is arranged between the bearing 22 and the main shaft 18, and the bearing 22 does not hinder the rotation of the main shaft 18. That is, the main shaft 18 is rotatably held by the bearing 22 and the bearing 62. If the main shaft 18 swings during rotation of the specimen 14, the bearing 22 also swings in accordance with the swing of the main shaft 18.

  The bearing 22 is attached to the fixed frame 12 by plate-like elastic members 24a and 24b having different directions. One end portions of the elastic members 24 a and 24 b having different directions are attached to the fixed frame 12 and suspended from the fixed frame 12. A bearing 22 is attached to the other ends of the elastic members 24a and 24b having different directions. A plate-like mounting portion 64 that faces in the vertical direction with respect to the bearing 22 is provided on the bearing 22, and the mounting portion 64 and the elastic members 24 a and 24 b having different directions are fixed. That is, the bearing 22 is suspended from the fixed frame 12 by elastic materials 24a and 24b having different directions. The attachment portion 64 is provided at a position that is a right and left object around the bearing 22. The elastic members 24a and 24b having different directions are fixed by fastening members such as bolts and nuts.

  There are two types of elastic materials 24a and 24b having different directions. The anisotropy elastic body is a second anisotropic elasticity provided with a flat plate-like first elastic material 24a having an anisotropy and a flat portion bent in a U-shape (Ω type). The material 24b (FIG. 6). Leaf springs can be used as the elastic members 24a and 24b having different directions.

  There are two elastic members 24a and 24b having different directions. A plurality of plate bodies 64 are provided on the bearing 22, and elastic members 24 a and 24 b having different directions are attached to the plate body 64. The same type of elastic materials 24 a and 24 b having different directions are attached to the bearing 22 at the same height. The position of the elastic material 24a having the first anisotropy and the position of the elastic material 24b having the second anisotropy may be interchanged. In the second elastic material 24b having a different direction, the plane 67 other than the U-shaped bent portion 66 is arranged on the same plane, and when the bearing 22 is suspended, the bearing 22 faces the direction of gravity of the earth. Like that. Since the elastic members 24a and 24b having different directions are suspended, it is possible to detect a shake in which the plane is twisted in addition to the shake in the direction perpendicular to the plane of the elastic members 24a and 24b having the different direction.

  In FIG. 1, the total number of the first elastic material 24a having different direction and the second elastic material 24b having different direction is four. If the second anisotropic material 24b is used, the total number of the first anisotropic material 24a and the second anisotropic body 24b is not limited to four. . The number of elastic members 24 a and 24 b having different directions is appropriately changed according to the size of the bearing 22.

  If the specimen 14 is not balanced when the specimen 14 is rotated, the main shaft 18 swings in the direction perpendicular to the central axis 50. The bearing 22 swings in accordance with the swing of the main shaft 18, and the elastic members 24a and 24b having different directions vibrate. Conventionally, vibration is detected only by the flat elastic material 24a having the first anisotropic direction, but in the present invention, the elastic material 24b having the second anisotropic property is also used. The elastic material 24b having the second anisotropic direction is bent in a U-shape, and the main shaft 18 is bent at the bent portion 66 even if the elastic material 24b having the second anisotropic direction is expanded or contracted due to a change in the ambient temperature distribution. By the expansion and contraction of the bearing 22 and the fixed frame 12, it is possible to reduce the tension acting on the elastic body having different directions. Even if the elastic material 24b having the second anisotropic direction expands and contracts, the mounting position of the elastic material 24b having the second anisotropic property and the fixed frame 12, the elastic material 24b having the second anisotropic property and the plate body The attachment position of 64 does not change. Measurement errors due to changes in ambient temperature distribution can be eliminated.

  Further, the expansion and contraction that can be absorbed by the bent portion 66 can absorb not only the elastic material 24b itself having the second anisotropic direction but also the expansion and contraction of the bearing 22.

  The sensor 26 measures displacements of the elastic materials 24a and 24b having different directions, that is, changes in positions from the sensor 26 to the elastic materials 24a and 24b having different directions. Although there are two elastic members 24a and 24b having different directions, the displacement of the two sheets may be measured, or the displacement of one sheet may be measured. The sensor 26 is attached to the fixed frame 12, and the position of the sensor 26 does not change when the specimen 14 rotates. The sensor 26 may be a non-contact sensor. Examples of the non-contact sensor include a device that measures displacement with a laser or an ultrasonic wave. Since the measurement is performed in a non-contact manner, the measurement can be performed stably without causing physical failure or destruction.

  Each elastic material 24a, 24b having different direction is mirror-finished, and the displacement of the part is measured. The mirror surface processing is performed on the back side of the portion attached to the plate 64 of the elastic members 24a and 24b having different directions. Note that the displacement of the bent portion 66 of the elastic material 24b having the second anisotropic direction is not measured. This is because the bent portion 66 absorbs the expansion and contraction of the elastic material 24b having the second anisotropic direction.

  The calculation unit 28 receives the displacement data measured by the sensor 26 and obtains the balance of the DUT 14. By storing a program for performing a desired calculation in the computer and causing the computer to perform the calculation, the computer is caused to function as the calculation unit 28. The calculation unit 28 determines whether the displacement measured by the sensor 26 is constant or whether the displacement changes regularly. If the displacement is not constant or changes irregularly, it can be seen that the balance of the specimen 14 is not uniform. For example, when the displacement is normally constant as shown in FIG. 7A, if the displacement changes as shown in FIG. 7B, the balance of the specimen 14 is not uniform. Although the displacement is measured using two kinds of elastic materials 24a and 24b having different directions, the balance of the specimen 14 may be obtained from the average thereof.

  If the direction of the specimen 14 (such as the direction of the position of the light spot mark) is kept constant when the specimen 14 is transported by the conveyor 46, the specimen 14 from the position where the displacement changes irregularly. It is also possible to obtain a position that is unbalanced. In this case, a sensor for detecting the rotation angle of the rim 16 is provided. An unbalanced position is obtained from the displacement of the elastic members 24a and 24b having a different direction from the rotation angle of the rim 16. If the direction of the specimen 14 is irregular when the specimen 14 is transported, it can be seen that the specimen is simply unbalanced.

  The balance measurement using the measuring device 10 is performed in the following order (1) to (7). (1) The specimen 14 is transported by the conveyor 46 and stopped at the position of the lower rim 36b. (2) The upper rim 36a is lowered, and the specimen 14 is sandwiched between the upper rim 36a and the lower rim 36b. (3) Air is put into the specimen 14 and the conveyor 46 is lowered. (3) The motor 20 is driven to rotate the rim 16 via the main shaft 18. The specimen 14 is sandwiched and fixed on the rim 16, and the specimen 14 also rotates at the same time. (4) When the specimen 14 rotates, the sensor 26 measures the displacement of the elastic members 24a and 24b having different directions, and the calculation unit 28 obtains the balance of the specimen 14 from the displacement. (5) After obtaining the balance, the motor 20 is stopped. (6) The specimen 14 is removed from the rim 16 with the bead breaker, the upper rim 36a is raised, and the conveyor 46 is also raised. (7) The specimen 14 is carried out by the conveyor 46. When measuring the balance of the plurality of specimens 14, the steps (1) to (7) are repeated each time the balance of one specimen 14 is obtained.

  As described above, the two types of elastic materials 24a and 24b having different directions are used and are not easily affected by changes in the ambient temperature distribution. Noise is small and measurement error can be reduced. Balance measurement with higher reliability than before is possible.

  As mentioned above, although embodiment was described about this invention, this invention is not limited to said embodiment. The sensor 26 is not limited to a non-contact sensor. A load cell, a piezoelectric element, a strain gauge, or the like may be used as long as the displacement of the elastic members 24a and 24b having different directions can be measured. Alternatively, it may be a device that measures by capacitance or eddy current.

  In addition to measuring the displacement, the acceleration when the elastic bodies 24b and 24b having different directions are shaken may be detected. The sensor 26 uses a sensor that detects acceleration. Alternatively, the speed may be obtained by integrating the acceleration with time, and the deflection of the spindle 18 may be obtained from the change in speed. The change of the acceleration or velocity is used instead of the displacement described above to determine the deflection of the main shaft 18. As the type of the sensor 26 for measuring the main shaft 18, an optimal device can be appropriately selected at the time of design / production.

  In addition to using both the first anisotropic material 24a and the second anisotropic material 24b, all the anisotropic bodies are elastic materials having the second anisotropic property. 24b may be used. In FIG. 1, the bearing 22 is suspended by four elastic members 24a and 24b having different directions, but the bearing 22 is suspended by four second elastic members 24b having different directions. Alternatively, the bearing 22 may be suspended only by the two second elastic materials 24b having different directions. The displacement of one elastic material 24b having the second different direction may be measured by the sensor 26, or the displacement of the plurality of second elastic materials 24b having the different direction may be measured by the sensor 26. good.

  In addition to transporting and unloading the specimen 14 by the conveyor 46, the specimen 14 may be transported and unloaded to the rim 16 by a robot arm. Further, it may be carried out without the conveyor 46 or the robot arm, and the specimen 14 may be transported and carried out to the rim 16 manually.

  The first anisotropic elastic body 24a is not limited to a simple plate shape. A plurality of slits 80 may be provided (FIGS. 8A and 8B). Further, the groove 82 may be used instead of the slit 80 (FIG. 8C). The groove 82 is provided on one surface or both surfaces of the first anisotropic elastic body 24a. The length, width, and number of the slits 80 are arbitrary. Further, the length, width, depth, and number of the grooves 82 are arbitrary.

  The first anisotropic elastic body 24a is not limited to a plate shape, and may be a band shape or a line shape. A plurality of first anisotropically oriented elastic bodies 24a in the form of strips or lines are arranged, and the bearings 22 are suspended (FIG. 9).

  Similarly to the first anisotropic elastic body 24a, the second anisotropic elastic body 24b may be provided with slits 80 or grooves 82. Furthermore, the second anisotropic elastic body 24b may also be in the form of a band or a line, and in that case, a bent portion 66 is provided in the form of a band or a line.

  The elastic bodies 24a and 24b having different directions are not completely rectangular in cross section, but may have curved ends or chamfers (FIGS. 10A and 10B). . Further, the thickness of each anisotropic elastic body 24a, 24b may not be constant. As shown in FIG. 10 (c), the cross section may have a bulge shape such as an ellipse.

  The bent portion 66 of the elastic material 24b having the second anisotropic direction shown in FIG. 6B is not limited to a U-shape. The shape of the elastic material 24b having the second anisotropic direction is not limited as long as it is bent at at least two places, the bearing 22 is hung at a portion other than the bent portion 66, and a displacement other than the bent portion 66 is detected. For example, as shown in the bent portions 66b and 66c in FIGS. 11A and 11B, they may be bent into a triangle or curved. Moreover, it may be bent so as to protrude not only in one direction but also in two directions like a bent portion 66d in FIG. Further, it may be a bent combination of various shapes.

  As shown in FIG. 12, the second anisotropic elastic body 24b may be bent twice. Each folding angle is 90 degrees. The bent portion 66 becomes a straight portion 66e. The positions of the fixed frame 12 and the attachment portion 64 are also shifted by the same distance as the length of the straight portion 66e.

  The second anisotropy elastic body 24b may have a curved corner as shown in FIG. 6B or a sharp corner.

  Each of the anisotropic bodies 24a and 24b having different directions may be a laminate of a plurality of plate-like bodies. Two or more plate-like bodies having different thermal expansions may be superposed.

  Each of the elastic bodies 24a and 24b having different directions suspends the bearing 22, but one or both of the elastic bodies 24a and 24b having different directions may support the bearing 22 from below. The plate-like attachment portion 64 is arranged above the fixed frame 12. When one side is suspended and the other is a push-up system, the effect of thermal expansion due to internal heat generation and ambient temperature change due to machine rotation is often a compressive force applied to the axial direction of the anisotropic elastic bodies 24a and 24b. . The non-directional elastic bodies 24a and 24b that support the bearing 22 from below are subjected to weighting in the buckling direction, but are less susceptible to error than the decrease in amplitude due to tension. Note that the bearing 22 may be similarly supported when only the second anisotropic elastic body 24b is used.

  In addition, the present invention can be carried out in a mode in which various improvements, modifications, and changes are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention.

10: measuring device 12: fixed frame 14: specimen (wheel, axle or tire)
16: Rim 18: Main shaft 20: Motor 22: Bearings 24a, 24b: Elastic material with different direction 26: Sensor 28: Calculation unit 52, 56: Timing pulley 58: Timing belt 60: Tension roller

Claims (5)

A fixed frame;
Means for holding the specimen;
A main shaft attached to the center of the holding means;
A motor for rotating the spindle;
A bearing for rotatably holding the main shaft;
A mounting portion that is attached to the bearing and has a plate-like shape oriented in a direction perpendicular to the bearing;
One end is the fixed frame, the other end is attached to the attachment portion, and a flat or belt-like first elastic material having a different direction,
A flat or strip-shaped second elastic material having one end attached to the fixed frame, the other end attached to the attachment portion, and a bent portion;
A sensor for measuring a displacement of the first anisotropic material and the second elastic material in the mounting portion;
A calculation unit for obtaining a balance of the specimen from the displacement, acceleration or speed measured by the sensor;
Measuring device equipped with. The measuring apparatus according to claim 1, wherein the sensor is a non-contact type sensor. A timing pulley attached to the main shaft;
A timing pulley attached to the rotating shaft of the motor;
A timing belt that is stretched from the timing pulley of the main shaft to the timing pulley of the motor and transmits the power of the motor to the timing pulley;
With
The measuring device according to claim 1 or 2, wherein a ratio of the number of revolutions of the timing pulley of the main shaft and the timing pulley of the motor is an integral multiple. The measuring apparatus according to claim 1, further comprising: a roller conveyor that transports and unloads the specimen to be held, and a roller that is provided around the holding means and has reduced surface friction . The measuring apparatus according to claim 4, wherein the rollers are arranged in two rows, and a device for changing an interval between the rows is provided.

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