JPH071217B2 - Wheel balancer calibration device and calibration method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of Industrial Application The present invention relates to a calibration device and a calibration method for a wheel balancer capable of calculating a highly accurate calibration amount in a wheel balancer for automobiles and other wheels.

(2) Conventional Technology As a conventional method for calibrating a wheel balancer of this type, an unbalanced amount of the support rotary shaft itself is rotated by rotating the support rotary shaft in an unloaded state in which no load is applied to the support rotary shaft of the wheel balancer. Then, an unknown unbalanced body to be measured is attached to the supporting rotary shaft, and the supporting rotary shaft is rotated to obtain the unbalanced amount of the unknown unbalanced body. A method is known in which arithmetic processing is performed to obtain a corrected measurement unbalance amount.

(3) Problems to be Solved by the Invention According to this conventional method, the unbalance amount of the supporting rotary shaft itself is used for correction in a no-load state.
Mechanically, it is greatly affected by noise such as bearing noise of the bearing part of the supporting rotary shaft and electrical noise that results in low level measurement in the measurement system, and thus the magnitude and phase of the unbalanced stress of the supporting rotary shaft itself. It becomes difficult to obtain an accurate measurement value of, and it is difficult to achieve accurate calibration.

It is an object of the present invention to provide a wheel balancer calibration device and a calibration method that solves such problems and enables highly accurate calibration.

(4) Means for Solving the Problems In order to achieve this object, the first invention relates to a calibration device, in which a wheel is mounted on a supporting rotary shaft to rotate the supporting rotary shaft, and an unbalance stress of the wheel is eliminated. In a wheel balancer of a magnitude and phase measuring type, a known radial position at a known axial position on the supporting rotary shaft or a same known axial position at the same known axial position. 180 from the first mounting position at the radial position
Vector of mass of the reference weight W to be mounted at the second mounting position deviated in degrees, and vector of magnitude and phase of unbalance stress when the mass means is mounted at the first mounting position and measured by the sensor means ▲ ▼ and the second
A storage means for storing the magnitude of the unbalanced stress and a vector ▲ ▼ of the phase when the mass is mounted at the mounting position and measured by the sensor means, and the unbalanced data of the supporting rotary shaft from the unbalanced data of the storage means. Balance vector and gain correction value A second aspect of the present invention relates to a calibration method, wherein a wheel is mounted on a supporting rotary shaft, the supporting rotary shaft is rotated, and the magnitude and phase of the unbalance stress of the wheel are measured. In the wheel balancer for measuring, the mass means of the reference weight W is attached to a first mounting position at a known radial position at a known axial position on the support rotary shaft, the support rotary shaft is rotated, and the sensor is rotated. Means for measuring the magnitude of the unbalanced stress and the vector ▲ ▼ of the phase and storing the unbalanced data in the storage means, and then storing the unbalanced data at the same known radial position in the same known axial direction. The reference mass means is attached to the second attachment position, which is 180 degrees out of phase with the first attachment position, the support rotary shaft is rotated, and the magnitude of the unbalanced stress is increased by the sensor means. Wherein the measuring the phase vectors ▲ ▼ storing data of the imbalance in the storage means, stored in said storage means by the operation means 2
Unbalance vector and gain correction value of the supporting rotation axis from the data of one unbalance Is calculated.

▲ ▼ = ▲ ▼ − ▲ ▼ = ▲ ▼ − E is a known unbalance amount that theoretically occurs when the reference weight W is attached.

(5) Action The reference mass means is attached to the first attachment position at the known radial position at the known axial position on the support rotary shaft,
The support rotating shaft is rotated, the magnitude and phase of the unbalanced stress are measured by the sensor means, and the unbalanced data is stored in the storage means.

Next, the reference mass means is removed from the first mounting position and the reference mass means is phased 180 degrees from the first mounting position at the same known radial position at the same known axial position. The unbalanced data is stored in the storage means by mounting the unbalanced stress on the second mounting position, rotating the supporting rotary shaft, measuring the magnitude and phase of the unbalanced stress by the sensor means. Then, the unbalance vector of the supporting rotary shaft, which is a calibration value, and the gain correction value of the entire measurement system are calculated from the two unbalance data stored in the storage means by the computing means. To calculate. Therefore, the calculated calibration value is accurate because it is calculated based on the unbalanced measurement data in the loaded state with the mass means attached, that is, in the state where the S / N ratio is mechanically and electrically favorable. .

(6) Embodiment One embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic configuration diagram of a wheel balancer. In FIG. 1, (1) is a frame of the wheel balancer, and (2) is a pair of protrusions (1a) of the frame (1).
(1b) shows the supporting rotary shaft supported by the bearing, and the stress detecting sensors (3a) (3b) mechanically connected to the supporting rotary shaft (2) at the positions of these protrusions (1a) (1b) A phase sensor (4) composed of a rotation angle sensor such as a photoelectric type or an electromagnetic type is provided at the root end of the supporting rotary shaft (2). (5) is these sensors (3a) (3b)
And a calculation means, that is, a calculation control device including a microcomputer for inputting the detection signal from (4) through the interface (6) and executing a predetermined calculation described later,
(7) shows a storage means or a storage device for storing the data of the calculation result as necessary, and (8) shows a display device for displaying the calculation result.

Further, (9) shows a wheel contact disk fixed to the tip end portion of the support rotary shaft (2).
A first screw hole (11a) at the first mounting position and a second screw hole (11b) at the second mounting position are formed at positions displaced by 180 degrees, and the screw rod of the reference mass means having the screw rod, that is, the weight (10). The weight (10) is attached at a position 180 degrees out of phase with the known axial position of the support rotary shaft (2) by screwing the screw into the first screw hole (11a) or the second screw hole (11b). It will be possible.

Next, a calibration method using the wheel balancer having the above configuration will be described.

First of all, the weight (10) is attached to the abutment disc (9) by its screw rod
After being screwed into and attached to the first screw hole (11a), the support rotary shaft (2) is brought to a predetermined rotation speed. Then, the magnitude and phase of the unbalanced stress at this time are measured by the stress detection sensor (3
a) (3b) and the phase sensor (4), and the data of the magnitude and phase of the unbalanced stress corresponding to the vector ▲ ▼ of FIG. 2 is measured through the interface (6) and the arithmetic and control unit (5). Stored in the storage device (7).

Next, the weight (10) is removed from the first screw hole (11a) of the contact disk (9) and the second screw hole (11b) is out of phase by 180 degrees.
Then, the supporting rotary shaft (2) is set to a predetermined rotational speed and the data of the magnitude and phase of the unbalanced stress corresponding to the vector ▲ ▼ in FIG. 2 are stored in the storage device (7) in the same manner as described above. To do. Then, the arithmetic and control unit (5) reads out the unbalanced data of the vectors ▲ ▼ and ▲ ▼ from the storage unit (7). Is calculated to obtain an unbalanced vector of the supporting rotary shaft (2) itself, and the magnitude and phase data of the stress corresponding to this vector are stored in the storage device (7).

Here, since the vector ▲ ▼ and the vector ▲ ▼ are respectively the unbalance generated by the reference weight (10) and the unbalance unique to the machine remaining on the support rotary shaft (2), the vector ▲ ▼ When the sum of the unbalanced data of the vector and the unbalanced data of the vector ▲ ▼ is calculated, the unbalance amount due to the reference weight (10) cancels each other out because the phase is different by 180 degrees, resulting in zero as a result. The data obtained by doubling the amount of unbalance unique to the machine remaining in (2) is obtained,
By halving this data as shown in Fig. 2, it is possible to know the exact amount of unbalance peculiar to the machine remaining on the supporting rotary shaft (2), and the vector corresponding to this value is zero-corrected. Calibration data.

Next, each vector of stresses ▲ ▼ and ▲ ▼ of the reference weight (10) having a phase shift of 180 degrees excluding the influence of the imbalance of the supporting rotary shaft (2) itself is as shown in Fig. 2 ▲ ▼ = ▲ ▼ -... (b) ▲ ▼ = ▲ ▼ -... (c), the arithmetic and control unit (5) reads out the data of ▲ ▼, ▲ ▼ and these from the storage device (7) and formulas (b) and (c) are obtained. Perform the calculation of ▲ ▼ and ▲
Ask for ▼. And these ▲ ▼ or ▲ ▼
The gain correction value k of the following equation peculiar to the machine is obtained by the arithmetic and control unit (5) by dividing by the known unbalance amount E theoretically generated when the weight (10) as the reference weight is attached.

Then, this gain correction value k is stored in the storage device (7).

Next, after removing the weight (10) from the contact disk (9), the side surface of the wheel (A) to be measured is brought into contact with the contact disk (9) as shown by the dotted line in FIG. And fixing it to the supporting rotary shaft (2) with a tightening tool (B), and rotating the supporting rotary shaft (2) at a predetermined high speed so that the stress sensors (3a) (3b) and the phase sensor (4) are rotated as in the conventional case. By measuring the magnitude and phase of the unbalanced stress on the left and right side surfaces of the wheel, and assuming that the unbalanced left and right measurement results are vectors ▲ ▼ and ▲ ▼, the arithmetic and control unit (5) is After reading the data of k and k, the calculation of the following equation is executed by the data of these measurement results ▲ ▼, ▲ ▼ and the data of k.

▲ ▼ = k (▲ ▼-) ...) e) ▲ ▼ = k (▲ ▼-) (f) The ▲ ▼ and ▲ ▼ thus obtained are the positions of the right and left side surfaces of the accurate wheel after calibration. Is a vector of unbalance, and the scalar quantity of the calculation result using these vectors ▲ ▼ and ▲ ▼, that is, the magnitude of the stress and the phase angle are displayed on the display device (8), and the worker can use the conventional display based on this display. Similarly, attach balance weights to the left and right sides of the wheel at the specified locations.

That is, according to this calibration method, the measurement state of the supporting rotary shaft is a loaded state, that is, a mechanically and electrically good S / N ratio, and the measurement condition of the measured object is the same. From the unbalance data, it is possible to accurately and easily find the machine-specific unbalance correction data and the machine-specific gain correction value remaining on the supporting rotary shaft.

As the calculation by the calculation control device (5) of the formulas (a) to (f), each vector is projected and converted into an orthogonal axis of the x-axis and the y-axis, and then the addition and subtraction are executed, and the result x The scalar amount of the vector of the calculation result, that is, the magnitude of the stress and the tilt phase angle of the vector are calculated from the values on the axes and the y-axis.

(7) Effects of the Invention As described above, according to the first aspect of the invention, it is possible to rotate the supporting rotary shaft at a known radial position at a known axial position with respect to each other by 180 degrees.
Since the reference mass means is attached to each of the first mounting position and the second mounting position, which are out of phase with each other, the structure is simple, and the unbalance vector and gain of the supporting rotary shaft are large. Since the calibration device is provided with the calculation means for calculating the correction value, a calibration device capable of calculating an accurate calibration value is obtained.
Data of magnitude and phase of unbalanced stress when the supporting rotary shaft is rotated at the mounting position and the unbalance when the reference mass means is mounted at the second mounting position and the supporting rotary shaft is rotated. Based on the magnitude and phase data of the balance stress, the calculation means calculates the unbalance vector of the supporting rotary shaft together with the calibration value of the gain correction value. It is possible to correct the gain of all the electrical and mechanical measurement systems, including, and thus, the measurement in the loaded state with good S / N ratio mechanically and electrically unlike the conventional no-load state. A calibration value can be calculated from the resulting data, the calibration value thus obtained is accurate, and the calibration value can be easily obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic explanatory view of one embodiment of a calibration device for a wheel balancer of the present invention, and FIG. 2 is a vector diagram showing that a calibration value is obtained from an imbalance of measurement results. (2) …… Supporting rotary shafts (3a), (3b), (4) …… Sensor means (5) …… Computing means (7) …… Storage means

Claims (2)

[Claims] 1. A wheel balancer of a type in which a wheel is mounted on a supporting rotary shaft, the supporting rotary shaft is rotated, and the magnitude and phase of stress of unbalance of the wheel are measured. A first mounting position at a known radial position at an axial position of or a second known 180 ° phase shift from the first mounting position at a same known radial position at the same known axial position. A mass means for the reference weight W to be mounted at the mounting position and a vector of magnitude and phase of unbalanced stress when the mass means is mounted at the first mounting position and measured by the sensor means.
▼ and storage means for storing the magnitude of the unbalanced stress and the vector ▲ ▼ of the phase when the mass is mounted at the second mounting position and measured by the sensor means, and the unbalanced data of the storage means Unbalanced vector of support rotation axis and gain correction value A calibration device for a wheel balancer, comprising a calculation means for calculating ▲ ▼ = ▲ ▼-▲ ▼ = ▲ ▼-E is a known unbalance amount that theoretically occurs when the reference weight W is attached. 2. A wheel balancer for mounting a wheel on a supporting rotary shaft, rotating the supporting rotary shaft, and measuring the magnitude and phase of unbalance stress of the wheel, the known shaft on the supporting rotary shaft. Direction, the mass means of the reference weight W is attached to the first attachment position at the known radial position, the supporting rotary shaft is rotated, and the vector of the magnitude and phase of the unbalanced stress is generated by the sunr means.
▼ is measured and the unbalanced data is stored in the storage means, and then a second phase is shifted by 180 degrees from the first mounting position at the same known radial position in the same known axial direction. The reference mass means is attached to the mounting position, the supporting rotary shaft is rotated, the magnitude of the unbalanced stress and the vector ▲ ▼ of the phase are measured by the sensor means, and the unbalanced data is stored in the storage means. , An unbalance vector of the support rotary shaft and a gain axis positive value from the two unbalance data stored in the storage means by the computing means A method for calibrating a wheel balancer, which comprises: ▲ ▼ = ▲ ▼-▲ ▼ = ▲ ▼-E is a known unbalance amount that theoretically occurs when the reference weight W is attached.