JPS5956141A - Wheel balancing device - Google Patents

Abstract

PURPOSE:To measure the balance state of a wheel with high precision by compensating the residual unbalance extent of a main shaft. CONSTITUTION:Only the main shaft 2 is rotated and pressure on bearings 4 and 5 are detected by sensors 7 and 8 and stored in a computer 14. The wheel 3 is attached and the main shaft 2 is rotated; electric signals corresponding to the outputs of the sensors 7 and 8 are sent to a computer 14. The computer 14 subtracts the previously stored output signals of the sensors 17 and 18 when only the main shaft 2 is rotated from the output signals to calculate only the original unbalance extent of the wheel while removing the residual unbalance extent of the main shaft 2 automatically, thereby displaying the calculated result on a display means 10.

Description

[Detailed description of the invention] The present invention relates to a wheel balancing device.

Conventional equipment of this type uses a rotating ball to which the wheel to be measured is mounted and fixed.
(at that time, the pressure applied to the bearing of the main shaft is detected and measured, and from the measurement results, the central balance weight and its mounting position are determined in order to balance the wheel.However, the above-mentioned Conventional equipment does not have a function to detect and remove the original unbalance (residual unbalance) of the above-mentioned main shaft, so for example, the above-mentioned main shaft/bar may be deformed and become unbalanced. At times, there was a drawback that the condition directly affected the measurement results, greatly reducing the measurement accuracy, and therefore making it impossible to accurately balance the wheels.

SUMMARY OF THE INVENTION An object of the present invention is to solve all of the above-mentioned problems, to provide a wheel balancing device that has a function of detecting and removing the residual unbalance amount, and has extremely high measurement accuracy. Therefore, the features of the present invention include a detection means for detecting the pressure applied to the bearing of the rotating main shaft when the wheel to be measured rotates, and a calculation process for the electric signal sent from the detection means to determine the balance state of the wheel. In addition, the measuring means has a correction function for correcting the electric signal in accordance with the residual unbalance amount of the main shaft.

Hereinafter, the present invention will be explained in detail based on the embodiments shown in the drawings.

In the VC shown in FIGS. 1 and 2, a main body (1) is rotatably provided with a wheel for measuring citron (3) and a rotating main shaft (2) for total number identification. ) is rotated at a predetermined rotation speed (for example, 60 Or, p, m, etc.) by means of a drive port (not shown) installed in the rotary ball g.
6h (As shown in Figure 2, 21I- is installed on the base ((3) on the main shaft (2) at predetermined intervals in the longitudinal direction,
The two bearings (4) (J: , l) are supported at two points, and the bearings (41 (J: , l) at the bottom of
Nuclear bearing (41 (detecting means for detecting pressure applied to 51)
71481 are arranged in series. The detection means (c (8)
specifically indicates a ceramic sensor made of piezoelectric material.

The pressure detected by the sensor (7) (s+ is input as an electrical signal to the measuring means (91), the input signal is subjected to calculation processing by the measuring means (9), and the calculation result is displayed on the display means 00. The display means aυ is
For example, the balance weight of the wheel (31) is displayed (digital display), and its mounting position l.
The balance state of the wheels (3) is displayed by displaying i& as a lamp.

The measuring means (!J) has a detailed configuration as shown in FIG. That is, the measuring means (9) is a sensor (7j (8
The electrical signals (e.g. electricity, pressure) sent from the filter (111) are processed with P liquid (filter (I) that extracts only the necessary frequency band from the signal with ...), and the electrical signals that are not sent from the filter (111) are processed by the An A/D converter Oe that converts the analog signal sent from the amplifier 0'2 into a digital signal, and an A/D converter Oe that amplifies the analog signal sent from the amplifier 0'2 to a digital signal. The microcomputer 04) transmits the result to the display means αυ.The microcomputer 04) corresponds to the residual unbalance amount of the main shaft (2) (- indicates the transducer (1)).
It has a function of correcting the above-mentioned signal sent from the source.

Next, this correction function will be explained. First, the basic principle of the above device will be explained. In Figure 4, (C)
If the force applied to a point is Wl, the forces X and -Y applied to points (A) and (B) are (1) From the moment with point (B) as the fulcrum, X
"Wl" b/a (21 (from the moment i with point A1 as the fulcrum, -Y
= Wl @ (a + b ) / a Furthermore, as shown in Fig. 5, if we consider the case where another force W2 is also applied to point (D), the forces applied to points (A) and (B) are Similarly, X and -Y are f31 X-'V/1 ・b / a +W211 (
b 10) / a(41-y=w, -(a-1-b
)/a-1-w2(a+b+c)/a.

If we consider point (C) and point (D) as fulcrum points, similarly, (5) W2=:X-(a-t-b)/c-(-Y)-b
/c16) -W1=X-(a-1-b-1-c)
/c-(-Y)-(b+c)/c.

Next, when considering the case of a rotating body, it is similar to the above, and in Fig. 6, (71X-W, C115(yl;
= W, +11011 (wt 102) (However, W:
Angular velocity of the rotating body, t: time, θ1. θ2: phase shift).

From Konera's formulas (1) to (8), Wl and W2 in the rotating body can be determined by measuring and dividing the X and -Y waveforms. That is, the force X applied to point (A) and (B
The car Y applied to one point becomes a sine wave, and if you know its phase shift and peak value (average value or absolute value can be used), then W,, W2
The size and position of the object can be measured. The basic principle of the present invention is based on the stiffness theory, and in Fig. 7,
(AHB) points respectively bearing (51 (position 41, (0)
(D) The position in the axial direction of the wheel (3) where the balance weighter should be attached to each wheel (3), (xi(-y)
The pressure detected by the detection means (7)+81, respectively, (
Wl) (W2) are the weights of the above balance weights! ,(
d) is the diameter of the wheel (3), X = X1 cos (wt + θ1) -Y = -Yl ct+s (wt + θ2) (where
l: peak value of X, Y: peak value of Y, W: rotational angular velocity of wheel (3), t: time, θ1° θ2: arbitrary 0
If the phase from the point is fl), then W2 = ((a+b)a XI moas (M le +
θl)/c b−Yl・aos (wt+θ2)/
c )/aW1=((b+c)'Y1m oos
(wt ten θzVc(a+b+c)−X,−cos(Wl
;+θl)/C)/(1. From the formula of Jl et al., W2
If and W are changed and rearranged, °also becomes .

Therefore, from the above two equations, the weight W of the balance weight
2, Wl is 'z= (((a+b)-x, acosθI 1)
”Y,”QQsl12)2+((a+b)*X1s
sinθr-1) @Yl @lucidθ2)2] Department adWl
= (((b0c)IIYI@COSθ2-(a+b
c)*X1ecosθ1)2+((b+c)sY,
*sinθ2-(a4-btoc)lIX,ll5i+
+02)2]Z*(1, which is 1, the mounting position w2'p, w, p are each from the 0 point of the child, W2P -IJ"'[: ((a0b)X1*sL
+θ1-1)”Y1*sinθ2)/ ((a+b)
*X1*cos#1-1)1Y,*co++//,)
)W I P -1an [2((b0c)-Y
1 fist sin θz-(a ten su ten c) -X1*sL+θ
1)/((bic) @y, *cov, -(a+b+c) @X, lID0Sθ1)].

The above is the basic principle, microcomputer 04)
is this principle (therefore, the above balance weight and its I
The computer α4) stores the electrical signal from the sensor (71f81) when the main shaft (2) is idling in the storage device, and ) It also has a function of correcting the electric signal sent from the sensor (c (8)) by the arithmetic unit 0υ using the stored signal when the sensor (c) (8) is mounted and rotated.

In other words, since both of the electrical signals mentioned above are sine waves, the computer (141id) handles these signals as trigonometric functions, and the computer (141id) attaches the wheel (3) to the main shaft (2) and calculates the From the electric signal obtained from the sensor (71f81) when rotating the main shaft (2),
) is rotated [, When the electric term obtained from the sensor (7) f81 is simply algebraically subtracted, the influence of the residual imbalance condition of the main 1 + l1 (21 can be completely removed. The original balance state of the wheels (31) is calculated accurately.

Therefore, in order to actually balance the wheel (3), first, rotate it with only 1,111+ (2+), and at this time, the pressure applied to the bearing (41 (5)) is detected by the sensor (71 (81), A negative signal corresponding to the pressure is stored in the computer 04).Next, the main shaft (2) is rotated with the wheel (3) attached, and at this time the bearing (4j (51)
Each sensor (71F81) detects the pressure applied to the wheels (71F81), and sends an electrical signal corresponding to the pressure to the computer Q417 (the computer α4) automatically removes the residual unbalance l' of the main shaft (2) and adjusts the wheel ( 3) Calculate only the original imbalance information and display the calculation result on the display means (1
0 to be displayed to the piercer.

For example, if the display means 00 does not display the duram display of the balance weight to be attached to the wheel (3) and the lamp display of its attachment position, the operator should prepare the balance weight as shown in the display and -F Attach the weight to the wheel (31) according to the indicated pump display.
For example, the wheels (3) can be balanced.

It should be noted that the present invention is of course not limited to the above-described embodiments, and is open to various design changes. For example, in the above embodiment, a ceramic sensor is used as the detection means (7) f81, but other means having the same function may be used. Further, it is preferable to use another calculation method having the same Ij9 function in place of the measuring means (91 is not limited to the one shown in FIG. 8, for example, the microcomputer 04).

The present invention has the configuration as described in detail above, and has effectively achieved its intended purpose. In particular, since the measuring means (91) for measuring the balance state of the wheel (3) to be measured is equipped with a function of removing the residual unbalance amount of the wheel (3) for mounting and rotating the wheel (3), for example, , the above main axis (2
) is deformed over time and becomes unbalanced and sharp, the balanced state of the wheel (3) can be measured with this state completely removed, and extremely accurate measurement results can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment according to the present invention, FIG. 2 is a schematic front view showing the main parts thereof, FIG. 8 is a block diagram showing the configuration of the circuit 1'ffi, and FIGS. (N1 is a diagram for explaining the basic principle between ships. ...Measurement means. Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7

Claims (1)

[Claims] 1. When the wheel to be measured (3) rotates, the bearing of the rotating main shaft (2) (
4) Detection means (71 (s)) for detecting the pressure applied to (5)
+, and a measuring means (岨) for measuring the balance state of the wheel (3) by calculating and processing the electric signal sent from the detecting means (71 [81), and the measuring means (9) is connected to the main shaft. (2) A wheel balance device characterized by having a correction function for increasing the electric signal to ?+li pressure in response to the residual unbalance amount.