JP7282299B1 - Wheel balancer measuring device - Google Patents

Abstract

An object of the present invention is to provide a wheel balancer measuring device capable of obtaining an unbalance amount and a rotational position of a wheel with a tire in a short time. SOLUTION: A first distance ZD between a body portion 2, a rotating shaft 4 having a grip portion 3, an electric motor 5, a first measuring end 71 and one side wall portion T1 is set to a first axis line L1. and a second measurement unit that measures a second distance LR1 between the second measurement end 81 and the inner peripheral surface W1a of the rim portion W1 of the wheel W without contact. 8, a moving unit 9 that moves the second measuring unit 8 along the first axis L1, an eccentricity measuring unit 10 that measures the eccentricity of the wheel W on which the tire T is mounted in correspondence with the rotational position, Based on the first distance ZD, the second distance LR1, and the amount of eccentricity, the signal processing unit 11 calculates the unbalance amount of the wheel W on which the tire T is mounted in correspondence with the rotational position, and the signal processing unit 11 calculates and a display unit 13 for displaying information representing the unbalanced amount and the rotational position. [Selection diagram] Fig. 1

Description

The present invention indicates the mounting positions of weights, also called balance weights, on wheels so that the eccentricity of the center of gravity with respect to the axis of rotation caused by wear of the tires, etc., of a wheel with tires on which automobile tires are mounted is offset. The present invention relates to a wheel balancer measuring device capable of

A conventional wheel balancer measuring device is described in Patent Document 1, for example. This Patent Document 1 describes a wheel balancer device that rotates with a wheel having a tire attached to the tip of a rotation main shaft, and measures the amount of unbalance and the rotational position due to the generated centrifugal force.

In the wheel balancer device of Patent Document 1, a laser length measurement sensor is provided in the device body in order to measure the inner diameter of the rim, the rim width, and the distance from the sensor to the inner side of the rim. The length measurement sensor is attached to the tip of the slide rod and has a laser moving device that slides the slide rod.

JP 2011-47795 A

The prior art described in Patent Document 1 does not have a configuration for measuring the rim width of the wheel. The operator reads the numerical value stored in the device, and manually inputs the measured value or read value from the display/operation unit to the main unit of the device. Therefore, the conventional technique described in Patent Document 1 has a problem that it takes time to obtain the unbalanced amount and the rotational position of the wheel with tires.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wheel balancer measuring device capable of obtaining the amount of unbalance and the rotational position of a wheel with tire in a short time.

The present invention comprises a main body,
a rotating shaft provided in the main body rotatably around a horizontal first axis and having a gripping portion detachably gripping a wheel on which a tire is mounted;
an electric motor that is provided in the main body and drives the rotating shaft to rotate about the first axis;
A first measuring section provided in the body section so as to face one side wall portion positioned outside the tire gripped by the gripping section, the first measuring section having a first measuring end. a first measuring unit that measures a first distance between and the one side wall along the first axis without contacting the one side wall;
A second measuring portion provided on the main body portion so as to be movable along the first axis, the second measuring portion having a second measuring end, and a distance between the second measuring end and the inner peripheral surface of the rim portion of the wheel. a second measuring unit that measures a second distance between the
a moving unit provided in the main body and configured to move the second measuring unit along the first axis;
an eccentricity measurement unit provided in the main body for measuring the eccentricity of the wheel on which the tire is mounted in correspondence with the rotational position of the rotating shaft about the first axis;
a signal processing unit that calculates, based on the first distance, the second distance, and the amount of eccentricity, an unbalance amount of the wheel on which the tire is mounted in correspondence with the rotational position;
a display unit that displays information representing the unbalanced amount and the rotational position calculated by the signal processing unit;
The signal processing unit is
calculating the second distance and the width of the rim portion when two weights having weights corresponding to the unbalance amount are driven into the wheel;
When driving the inner weight into the wheel and attaching the outer weight to the wheel, calculating the second distance and the distance from the inner flange of the rim portion to the mounting position of the outer weight,
if both of the two weights are attached to the wheel, calculating the second distance and the distance between the mounting positions of the two weights;
A wheel balancer measuring device characterized by:

Further, the present invention is characterized in that the first measuring unit is an ultrasonic measuring instrument.

Further, according to the present invention, the second measurement unit
an emission unit that emits laser beam light;
and a light receiving portion for receiving light reflected by the inner peripheral surface of the wheel of the laser beam light emitted from the emitting portion.

The eccentricity measurement unit may further include a distortion detection unit that outputs a distortion detection signal representing the amount of distortion of the rotating shaft and the rotational position to the signal processing unit.

The signal processing unit causes the second measuring unit to apply a reference beam representing the rotational position corresponding to the maximum amount of distortion of the rotating shaft to a position on the inner peripheral surface of the wheel that corresponds to the rotational position. It is characterized in that it is configured to irradiate.

According to the present invention, the first measuring section measures a first distance to the outer side wall portion, also called sidewall of the tire, and the second measuring section measures a second distance to the inner peripheral surface of the rim portion of the wheel. It is scanned and measured along the first axis. Also, the eccentricity measurement unit measures the eccentricity of the rotating shaft during rotation in correspondence with the rotational position. The signal processing unit calculates the unbalance amount and the rotational position of the wheel on which the tire is mounted based on the first distance, the second distance, and the amount of eccentricity. Is displayed. Therefore, it is not necessary for an operator to manually measure the rim width of the wheel as in the prior art, and the amount of unbalance and the rotational position of the wheel with tires can be measured in a short period of time.

Further, according to the present invention, since the first measurement unit is realized by an ultrasonic measuring device, even if one side wall portion of the tire is configured to be convexly curved toward the first measurement end, the one side wall portion and the first measuring end can be accurately measured as the first distance.

Further, according to the present invention, even if the shape of the portion to be measured has a step such as the inner peripheral surface of the rim of a wheel, the laser beam emitted from the emitting portion is irradiated, and the reflected light is received by the light receiving portion. By receiving the light, the distance between the second measurement end and the inner peripheral surface of the rim of the wheel can be accurately measured as the second distance.

Further, according to the present invention, the amount of distortion of the rotating shaft and its rotational position are detected by the detecting section of the eccentricity amount measuring section, and the detected amount of distortion and rotational position are output to the signal processing section as a distortion detection signal. It is possible to obtain the amount of distortion and the rotational position during rotation of the wheel on which the wheel is mounted, and to accurately measure the amount of distortion and the rotational position while the vehicle is running.

Further, according to the present invention, since the reference light representing the rotational position obtained by measurement is irradiated onto the inner peripheral surface of the wheel, the weight corresponding to the strain amount measured by the operator can be easily and accurately determined. It can be attached to a position on the inner peripheral surface of the wheel where the reference light is irradiated, and workability can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is the front view which notched a part of wheel balancer measuring device 1 of one Embodiment of this invention. 2 is a block diagram showing an electrical configuration of the wheel balancer measuring device 1; FIG. 4 is a flowchart for explaining the operation of the wheel balancer measuring device 1; FIG. 4 is a cross-sectional view of a wheel for explaining data necessary for wheel balance measurement; FIG. 4 is a perspective view showing a state of measurement by the scale lever SL; 8 is a perspective view showing a state of measurement by the second measuring section 8; FIG. 8 is a cross-sectional view showing the relationship between the distance measured by the second measuring unit 8 and the wheel W. FIG. FIG. 7 is a cross-sectional view for explaining a measurement procedure of the second measuring section 8; 4 is a perspective view showing a mounting structure of the first measuring section 7; FIG. 3 is a perspective view showing the appearance of a first measuring section 7; FIG.

FIG. 1 is a partially cutaway front view of a wheel balancer measuring device 1 according to an embodiment of the present invention. FIG. 2 is a block diagram showing the electrical configuration of the wheel balancer measuring device 1. As shown in FIG. The wheel balancer measuring device 1 of this embodiment measures the amount of eccentricity of the center of gravity of a wheel with tires, which is the wheel of an automobile such as an ordinary car, bus, or truck, and adjusts the rim W1 of the wheel W so that the eccentricity is offset. It is used to present the weights and mounting positions of the weights w1 and w2 as adjusting weights for balancing the rotating body, also called balance weights. Wheel W is made of an aluminum alloy, for example.

The wheel balancer measuring device 1 includes a body portion 2, a rotating shaft 4, an electric motor 5, a first measuring portion 7, a second measuring portion 8, a moving portion 9, an eccentricity measuring portion 10, and signal processing. It includes a unit 11 and a display unit 13 . The rotary shaft 4 is provided in the body portion 2 so as to be rotatable around a horizontal first axis L1, and has a grip portion 3 that detachably grips the wheel W on which the tire T is mounted. The electric motor 5 is provided in the main body 2 and drives the rotating shaft 4 to rotate about the first axis L1.

The first measuring portion 7 is provided on the main body portion 2 so as to face one side wall portion T<b>1 positioned outside the tire T gripped by the gripping portion 3 . The first measuring portion 7 has a first measuring end 71 and measures a first distance ZD between the first measuring end 71 and the one side wall portion T1 along the first axis L1. Non-contact measurement against The second measuring section 8 is provided on the main body section 2 so as to be movable along the first axis L1. The second measuring section 8 has a second measuring end 81, and measures a second distance LR1 between the second measuring end 81 and the inner peripheral surface W1a of the rim portion W1 of the wheel W as the inner peripheral surface of the rim portion W1. Measurement is performed by scanning along the first axis L1 without contacting W1a.

The moving portion 9 is provided on the main body portion 2 and moves the second measuring portion 8 along the first axis L1. The eccentricity measurement unit 10 detects the amount of distortion of the rotating shaft 4 when the rotating shaft 4 rotates, and measures the amount of eccentricity of the wheel W on which the tire T is mounted on the rotating shaft 4 based on the detected amount of strain. It is measured corresponding to the rotational position around the axis L1. Based on the first distance ZD, the second distance LR1, and the amount of eccentricity, the signal processing unit 11 calculates the amount of imbalance of the wheel W on which the tire T is mounted in correspondence with the rotational position. The display unit 13 displays information representing the unbalanced amount and the rotational position calculated by the signal processing unit 11 .

The signal processing unit 11 is composed of a central processing unit (CPU) provided in a control means 12 implemented by a computer. The eccentricity measuring unit 10 includes the aforementioned electric motor 5 for rotationally driving the rotating shaft 4, a braking device 14 for braking the rotation of the rotating shaft 4, and a speed detector 15 for detecting the rotational speed of the rotating shaft 4. , a phase detector 16 for detecting the phase of the rotating shaft 4 and a pair of strain detectors 41 and 42 . The wheel balancer measuring device 1 further includes the aforementioned display section 13, an operation section 19, and a memory 20 in which programs read and executed by the control means 12 are stored.

In this embodiment, strain detection uses a strain gauge to detect an external force load as a strain amount and converts it into an electrical signal. Piezoelectric detection uses a piezoelectric sensor to detect an external force load as a pressure and converts it into an electrical signal. . When an ultrasonic sensor is used, the balancer itself may be configured by strain detection or may be configured by piezoelectric detection.

Based on the rotation amount detection signal from the speed detector 15 and the distortion detection signals from the distortion detectors 41 and 42, the control means 12 calculates the amount of eccentricity of the wheel W with tires and its rotational position, The obtained eccentricity and rotational position are displayed in correspondence with each other on the display unit 13 . The strain detectors 41 and 42 are, for example, strain gauges. The operator confirms the amount of eccentricity and the rotational position displayed on the display unit 13, and places the weight, which is the amount of unbalance corresponding to the amount of eccentricity, at the corresponding rotational position on the rim W1 of the wheel W. The weights w1 and w2 are attached and fixed. The inner weight w1 may be screwed onto the inner peripheral surface W1a of the rim W1, and the outer weight w2 may be adhered with an adhesive. The inner weight w1 may be used properly depending on the shape of the wheel W. If the shape of the inner rim is a flange shape into which the weight can be driven, it is driven in, but if it is a shape without a flange portion, it may be pasted. The outer weight w2 may be used differently depending on the type of wheel W. If the steel wheel has a flange shape into which the weight w2 can be driven, it can be driven, but since the aluminum wheel does not have a flange portion on the outside, it may be stuck to the inner surface of the wheel W.

The main body 2 has a housing made of a highly corrosion-resistant metal such as a stainless steel plate. An upper panel body 22 having a plurality of recesses 21 in which a plurality of weights are divided according to type such as weight and accommodated is attached to the upper portion of the main body 2 . A base 23 is fixed vertically to the lower portion of the main body 2 in the longitudinal direction, and the wheel balancer measuring device 1 is vertically and stably installed on the floor 24 by the base 23 .

The housing of the main body 2 has four side walls extending substantially perpendicular to each other, and the control means 12 is mounted on the upper panel body 22 above these side walls. A display unit 13 is mounted on 12 . The display unit 13 may be realized by a liquid crystal display device. The control means 12 has an operation section 19 and is realized by a control unit containing a computer. The operation unit 19 may be implemented by, for example, a keyboard, touch panel, or the like.

The eccentricity measuring unit 10 is provided in the upper space within the main unit 2, which is defined as an explosion-proof structure required area by the Fire Service Act. The upper space is a space in the main body 2 having a height H of 600 mm or more vertically above the floor 24 and below the upper panel body 22 .

The eccentricity measurement unit 10 includes a scale lever SL as means for measuring the inner diameter of the rim W1, a support 30 provided at a height H from the floor 24 in the main body 2, and a support 30 a pair of bearings 31 and 32 fixed coaxially with the first axis L1 and spaced apart from each other; A photodetector 36 having a light-emitting portion and a light-receiving portion (not shown) provided on both sides of the outer peripheral portion is provided.

Photodetector 36 is implemented by, for example, a photointerrupter. The light shielding plate 33 has a plurality of slits formed at equal intervals in the circumferential direction on the outer peripheral portion thereof. Light emitted from the light-emitting portion to the light-shielding plate 33 is received by the light-receiving portion through the slit of the light-shielding plate 33 . The light receiving portion switches the detection signal from a low level to a high level each time it receives light passing through the slit of the light shielding plate 33, and the light emitted from the light emitting portion toward the light receiving portion travels in the circumferential direction of the light shielding plate 33. When blocked by the light-shielding portion between the slits adjacent to the , a rotation detection signal having a pulse waveform that changes from high level to low level is output.

Strain detectors 41 and 42 are fixed to the bearings 31 and 32, respectively. Each of the strain detectors 41 and 42 detects the amount of strain of the rotating shaft 4 caused by the shake of the wheel W with the tire T attached to the rotating shaft 4, and uses the detected strain amount as a strain detection signal. It is output to the signal processing section 11 of the control means 12 in association with the rotational position. The control means 12 displays the amount of eccentricity at the rim portion W1 of the wheel W with the tire T and the weights of the weights w1 and w2 on the display screen of the display portion 13 in synchronization with the rotation detection signal output from the photodetector 36. configured to

The first measurement unit 7 is implemented by an ultrasonic measuring instrument. The second measuring unit 8 is implemented by a laser rangefinder having an emitting unit that emits laser beam light and a moving unit 9 that moves the emitting unit parallel to the first axis L1. The moving part 9 may be realized by, for example, a configuration in which a gear is attached to a stepping motor, the gear is meshed with the rack, and the stepping motor is rotated to move the rack forward and backward.

The second measuring unit 8 has an emitting portion that emits laser beam light and a light receiving portion that receives reflected light from an object. A laser range finder may be used that measures the length from the amount of wavelength deviation from . As the laser rangefinder, for example, model number CD33-250NA manufactured by Optex Co., Ltd. can be used.

FIG. 3 is a flow chart for explaining the operation of the wheel balancer measuring device 1. FIG. At step s1, the work for measuring the eccentricity of the rotating shaft 4 is started, and when the operator presses the start button of the operation unit 19, a start signal is output from the operation unit 19 to the control means 12, The control means 12 is reset to the initial state at the start of measurement.

At step s2, the control means 12 outputs a rotation command signal to the electric motor 5 to start the rotation.

When the rotary shaft 4 is driven to rotate about the first axis L1 by the start of the rotating operation of the electric motor 5, the control means 12 starts rotating based on the detection signals from the speed detector 15 and the phase detector 16. If it is determined that the rotation has started, the process moves to step s3. If the rotation has not started, for example, if the pulse signal from the photodetector 36, which is the detection signal from the speed detector 15, does not change, it is determined that the rotation has not started, and a predetermined time of 3 After waiting for a period of ~10 sec, the process ends at step s5.

At step s3, the control means 12 calculates the amount of eccentricity corresponding to the rotational position of the rotary shaft 4 based on the detection signals from the speed detector 15 and the phase detector 16, and displays the rotational position and the amount of eccentricity on the display section 13. indicate. The rotational speed of the rotary shaft 4 is about 210 rpm to 360 rpm, and is rotated counterclockwise when viewed from the right side perpendicular to the first axis L1. The wheel W with tires that can be attached to such a rotating shaft 4 has a wheel diameter of 10 to 30 inches, a wheel width of 2 to 15 inches, and a maximum tire outer diameter of 900 mm. When the measurement of the eccentricity of the wheel with tires W is completed, the process proceeds to step s4, where the control means 12 operates the braking device 14 to brake the rotation of the electric motor 5 and stop the rotating shaft 4. The braking device 14 may be implemented by a so-called motor with a brake, in which the electric motor 5 has a built-in braking mechanism. When the control means 12 detects that the rotation has stopped based on the detection signals from the speed detector 15 and the phase detector 16, the process ends at step s5.

The operator attaches a balance weight corresponding to the amount of eccentricity displayed on the screen of the display unit 13 to the rotational position of the wheel W corresponding to the amount of eccentricity, removes the wheel W with tires from the rotating shaft 4, and performs wheel balance measurement work. finish.

FIG. 4 is a cross-sectional view of a wheel for explaining data necessary for wheel balance measurement. FIG. 4(a) shows a cross section when the weights w1 and w2 on both sides are driven in, and FIG. 4(c) shows a cross section when the weights w1 and w2 on both sides are attached. Each of the weights w1 and w2 is driven into or attached to the inner peripheral surface W1a of the rim W1 of the wheel W. Therefore, when driven into both sides, as shown in FIG. A rim width LW is calculated by the signal processing unit 11 .

When the inner weight w1 is driven in and the outer weight w2 is attached, as shown in FIG. 4B, the second distance LR1 and the distance L2 from the inner flange to the mounting position of the outer weight w2 is calculated, and when both the inner weight w1 and the outer weight w2 are attached, as shown in FIG. and the distance L3 are calculated.

In the case of laser scanning, the weights are attached to the inner and outer flat parts of the wheel, so the laser scan reads the shape of the rim and analyzes where the flat position is. I am asking for it. As a result of the analysis, the positions of the weights w1 and w2 are determined, and the rim width is known. Also, in the case of scale input, the operator determines the position to attach the weight. You can determine where to place the weight by applying the and entering the measured distance.

5 is a perspective view showing a state of measurement by the scale lever SL, and FIG. 6 is a perspective view showing a state of measurement by the second measuring section 8. FIG. The wheel W is attached to the rotating shaft 4 of the wheel balancer measuring device 1 and rotated at high speed. Prior to measurement, the diameter of the inner side of the rim to which the weight w1 is attached, and the distance between the outer side and the inner side to which the weight w2 is attached. (rim width) and the distance to the rim-in side where the scale lever SL and the inner weight w1 are attached are measured. The scale lever SL may be configured, for example, to read the amount of angular displacement of the lever using a rotary encoder.

FIG. 7 is a sectional view showing the relationship between the distance measured by the second measuring section 8 and the wheel W. As shown in FIG. The second measuring unit 8 is moved by the moving unit 9 by a distance LD from a standby position retracted inside the one side portion 2a of the main body 2 to a measurement start position protruding from the one side portion 2a along the first axis L1. be moved. This measurement start position corresponds to the position where the inner weight w1 is detected, and the second measurement unit 8 is moved by the moving unit 9 from the measurement start position to the detection position of the outer weight w2, as shown in FIG. Measure the wheel width WB.

FIG. 8 is a cross-sectional view for explaining the measurement procedure of the second measuring section 8. As shown in FIG. ZD is the first distance between one side wall portion T1 located on the outer side of the tire T and the first measurement end 71 of the first measurement unit 7 by the first measurement unit 7, and the first measurement unit 7 at the measurement start position C is the distance between the first measuring end 71 of and the second measuring end 81 of the second measuring part 8, LR1 is the second distance, A1 is the width of the flange in the diametrical direction, A1 is attached to the inner weight w1 from the flange When the distance along the first axis L1 to the position is B, and the fixed value according to the shape of the tire T is D, the signal processing unit 11 determines that the wheel diameter WR is

WR= 2.LR1 +A1+A1 (1)
and the distance LD1 along the first axis L1 from the second measuring end 81 of the second measuring unit 8 to the mounting position of the inner weight w1 is the distance to the mounting position of the inner weight w1 of the second measuring unit 8. When the amount of movement along the first axis L1 is LD,

LD1=LD-B (2)
The wheel width WB is calculated by

WB=C-LD1-ZD-D (3)
Calculated by

9 is a perspective view showing the mounting structure of the first measuring section 7, and FIG. 10 is a perspective view showing the appearance of the first measuring section 7. As shown in FIG. Equations 1 to 3 above are stored in memory 20 . The first measurement unit 7 may be realized by, for example, an ultrasonic sensor, which is an ultrasonic measuring instrument. As an ultrasonic sensor, for example, model number E4C-DS30L manufactured by Omron Co., Ltd. can be easily obtained commercially. By using an ultrasonic sensor for the first measurement unit 7, the measurement range can be measured over a relatively wide range. The distance can be accurately measured even if the shape is convexly curved to the side.

The first measuring unit 7 is housed in a case 26 provided near the tip of an arm 25 that protrudes beyond the tip 4a of the rotating shaft 4 from the main body 2 and is bent in a substantially L shape in plan view. is provided. The first measuring section 7 has a first measuring end 71 . For example, when the first measuring unit 7 is an ultrasonic sensor, the first measuring end 71 is a transmitting/receiving unit for ultrasonic waves, and is selected as a starting point for distance measurement.

In addition, since the second measuring unit 8 measures each distance of the wheel W with the laser beam light as described above, even if the shape of the object having steps such as the inner peripheral surface W1a of the rim W1 of the wheel W, , a laser beam emitted from the emitting portion is irradiated, the reflected light is received by the light receiving portion, and the distance between the second measurement end 81 and the inner peripheral surface W1a of the rim W1 of the wheel W is defined as a second distance LR1. can be measured accurately as In addition, after the balance measurement is completed, the operator is instructed where to attach the weight, so the position can be pinpointed with laser beam light.

As described above, according to the present embodiment, the first distance ZD from the first measurement end 71 to the outer side wall portion T1, which is also called the sidewall of the tire T, is measured by the first measurement section 7, and the rim of the wheel W is measured. A second distance LR1 of the inner peripheral surface W1a of the portion W1 is scanned and measured by the second measurement unit 8 along the first axis L1. Further, the eccentricity measuring unit 10 measures the eccentricity of the rotary shaft 4 during rotation in correspondence with the rotational position. Based on the first distance ZD, the second distance LR1, and the amount of eccentricity, the signal processing unit 11 calculates the unbalance amount of the wheel W on which the tire T is mounted as the weight of each weight w1, w2, and determines the rotational position. The unbalanced amount and the rotational position calculated from the rotational angular position of the wheel W are displayed by the display unit 13 . Therefore, it is not necessary for an operator to manually measure the rim width of the wheel W as in the prior art, and the unbalance amount and rotational position of the wheel W with the tire T can be measured in a short time.

In addition, since the first measurement unit 7 is realized by an ultrasonic measuring device, even if one side wall portion T1 of the tire T is curved convexly toward the first measurement end 71, the one side wall portion T1 and the first measuring end 71 can be accurately measured as the first distance ZD.

Further, even if the shape has a step like the inner peripheral surface of the rim W1 of the wheel W, the laser beam light emitted from the emitting part is irradiated, the reflected light is received by the light receiving part, and the second measuring end is measured. The distance between 81 and the inner peripheral surface of rim W1 of wheel W can be accurately measured as second distance LR1.

Further, the amount of strain and the rotational position of the rotating shaft 4 are detected by the detecting portion of the eccentricity measuring portion 10, and the detected amount of strain and the rotational position are output to the signal processing portion 11 as a strain detection signal. The amount of distortion and the rotational position of the mounted wheel W during rotation can be obtained, and the amount of distortion and the rotational position can be accurately measured while the vehicle is running.

In addition, since the inner peripheral surface of the wheel W is irradiated with the visible reference light representing the rotational position corresponding to the maximum value of the strain amount obtained by measurement, it corresponds to the strain amount measured by the operator. The weights w1 and w2 can be easily and accurately attached to the positions on the inner peripheral surface of the wheel W irradiated with the reference light, and workability can be improved.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and improvements can be made without departing from the scope of the present invention. It is possible. It goes without saying that all or part of each of the above-described embodiments can be appropriately combined within a non-contradictory range.

REFERENCE SIGNS LIST 1 wheel balancer measuring device 2 body portion 3 gripping portion 4 rotating shaft 5 electric motor 7 first measuring portion 71 first measuring end 8 second measuring portion 81 second measuring end 9 moving portion 10 eccentricity measuring portion 11 signal processing portion 13 Display unit 12 control means 14 braking device 15 speed detector 16 phase detector 19 operation unit 20 memory 21 recess 22 upper panel body 23 base 24 floor 30 support 31, 32 bearing 33 light shielding plate 36 photodetector 41, 42 strain Detector L1 First axis LR1 Second distance T Tire T1 One side wall W Wheel W1 Rim W1a Inner surface w1, w2 Weight ZD First distance

Claims (5)

a main body;
a rotating shaft provided in the main body rotatably around a horizontal first axis and having a gripping portion detachably gripping a wheel on which a tire is mounted;
an electric motor that is provided in the main body and drives the rotating shaft to rotate about the first axis;
A first measuring section provided in the body section so as to face one side wall portion positioned outside the tire gripped by the gripping section, the first measuring section having a first measuring end. a first measuring unit that measures a first distance between and the one side wall along the first axis without contacting the one side wall;
A second measuring portion provided on the main body portion so as to be movable along the first axis, the second measuring portion having a second measuring end, and a distance between the second measuring end and the inner peripheral surface of the rim portion of the wheel. a second measuring unit that measures a second distance between the
a moving unit provided in the main body and configured to move the second measuring unit along the first axis;
an eccentricity measurement unit provided in the main body for measuring the eccentricity of the wheel on which the tire is mounted in correspondence with the rotational position of the rotating shaft about the first axis;
a signal processing unit that calculates, based on the first distance, the second distance, and the amount of eccentricity, an unbalance amount of the wheel on which the tire is mounted in correspondence with the rotational position;
a display unit that displays information representing the unbalanced amount and the rotational position calculated by the signal processing unit;
The signal processing unit is
calculating the second distance and the width of the rim portion when two weights having weights corresponding to the unbalance amount are driven into the wheel;
When driving the inner weight into the wheel and attaching the outer weight to the wheel, calculating the second distance and the distance from the inner flange of the rim portion to the mounting position of the outer weight,
if both of the two weights are attached to the wheel, calculating the second distance and the distance between the mounting positions of the two weights;
A wheel balancer measuring device characterized by: 2. The wheel balancer measuring device according to claim 1, wherein the first measuring unit is an ultrasonic measuring device. The second measurement unit
an emission unit that emits laser beam light;
3. The wheel balancer measuring device according to claim 1, further comprising a light receiving section for receiving light reflected by the inner peripheral surface of the wheel of the laser beam light emitted from the emitting section. 4. The eccentricity measurement unit further includes a distortion detection unit that outputs a distortion detection signal representing the amount of distortion of the rotating shaft and the rotational position to the signal processing unit. The wheel balancer measuring device according to item 1. The signal processing unit causes the second measuring unit to apply a reference beam representing the rotational position corresponding to the maximum amount of distortion of the rotating shaft to a position on the inner peripheral surface of the wheel that corresponds to the rotational position. 4. A wheel balancer measuring device according to claim 3, characterized in that it is configured to irradiate.

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