JPS5984132A - Eccentricity compensating method of imbalance measurement - Google Patents

Abstract

PURPOSE:To eliminate the influence of eccentricity by adding the amounts of eccentricity compensation which are obtained by an inversion test and correspond to respective correction surfaces of a rotating shaft body to imbalance measured values, and removing an eccentricity corresponding part. CONSTITUTION:The rotation shaft body 1 is mounted on a testing machine 6 and rotated, and measured values of pickups 11, 16, and 16 are stored in a storage circuit. While a sleeve bearing 3 is left as it is, a sleeve bearing 2 and the rotating shaft body 1 are attached at their connection part with the connection inverted by 180 deg. and then the rotating shaft body 1 is rotated to store the current measured value in the storage circuit. Further, while the sleeve bearing 2 is left as it is, the sleeve bearing 3 and rotating shaft body 1 are attached to their connection part with the connection inverted by 180 deg. and then the rotating shaft body 1 is rotated to store the measured value in the storage circuit. The measured values obtained in said operations are used to calculate the amounts of eccentricity compensation of respective surfaces, and they are stored in the storage circuit. The amounts of eccentricity compensation are added to the imbalanced amount and arithmetics are carried out to obtain the imbalance of only the rotating shaft body 1 after the eccentricity corresponding part is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an eccentricity compensation method in damage measurement, particularly in the case where a rotating shaft as a test specimen has a bearing in the longitudinally intermediate portion, the rotating shaft and the bearing that supports it. This relates to a technique for compensating for eccentricity between

A rotating shaft body, especially a rotating shaft body such as an automobile propeller shaft, is subjected to an unbalance tester 6 equipped with a rotating shaft body 1 and sleeve bearings 2 and 3, as shown in FIG. There is a device that measures unbalance, but when the unbalance of the rotating shaft body 1 is measured by the unbalance tester 6 using such a method, if there is eccentricity between the sleeve bearings 2, 3 and the rotating shaft body 1, the test is performed. Since the rotating shaft body 1, which is a body, is swung, an unbalance due to the eccentricity described above may be detected even if there is no unbalance in the test specimen itself. That is, for example, the rotating shaft body 1 by the sleep bearing 2
In the support part, an eccentricity a exists between the rotation center axis 7 of the rotor 4 fitted in the bearing part and the rotation center axis 8 of the rotating shaft body 10, and f: the rotor fitted in the bearing part of the sleep bearing 3. 5
Assuming that there is an eccentricity between the rotation center axis 9 of the rotation shaft body 10 and the rotation center axis 8 of the rotation shaft body 10, even if the unbalance of the rotation shaft body 1 itself is 0, it is proportional to the eccentricities a and b. An imbalance is detected. Unbalance caused by such eccentricities a and b? In order to detect and correct it, a reversal test is conventionally performed in which the phase of the rotating shaft body 10 is shifted by 180°, and the eccentricity a
The unbalance caused by 2 is corrected by a' on the sleeve bearing 2 side to cancel it, while the unbalance due to eccentricity is corrected with b' on the sleeve bearing 3 side. there were. As a result, the influence of the eccentricities a and b is removed, and the unbalance of only the rotating shaft body 1 can be detected.

However, the rotating shaft body 1 itself has a bearing part in an intermediate position? There are structures that have this. In order to perform an unbalance test on the rotating shaft 1, it is supported by sleeve bearings 2 and 3 at both ends of the rotating shaft 1, supported by a third bearing at the middle bearing part, and rotated. A balance measurement is performed and the rate balance is corrected using the correction plane A corresponding to the sleep bearing 2, the correction plane B1 corresponding to the sleep bearing 3, and the correction plane C corresponding to the third bearing. However, in general, eccentricity occurs between the surfaces A, B, and C for correcting unbalance and the rotating shaft 1 and the sleep bearings 2 and 3 as described above (that is, the rotating shaft The mounting surface with the sleep bearing) is not aligned with the mounting surface of the sleep bearing, and if a reversal test is performed with the modified surface introduced as a separate circuit, eccentricity a will also occur with respect to the modified surface C.
and b were affected, but since the third bearing part was the dN & bearing of the test specimen itself, it could not be directly corrected by the above-mentioned reversal test.

The present invention was made to solve the above-mentioned conventional problems, and its purpose is to detect eccentricity between the rotating shaft and the sleep bearing that supports it in unbalance measurement of the rotating shaft. It is an object of the present invention to provide an eccentricity compensation method that allows a considerable amount of correction to be removed also to the correction surface C.

In order to achieve such an object, the present invention memorizes each measurement value obtained by rotation of the rotating shaft body and two reversal tests in order to compensate for eccentricity in the correction surface C corresponding to the third bearing, and The gist is to calculate the eccentricity compensation amount ft corresponding to each correction surface from the measured value, add this eccentricity compensation amount to the unbalance measurement value, and remove the eccentricity equivalent from the lower balance measurement value. It is something. By adopting such an electrical compensation method, even if there is eccentricity between the rotating shaft body and the sleep bearing, it is possible to correct the defect by removing the amount equivalent to this eccentricity by calculation, so that the center of the rotating shaft body The effect of eccentricity on the bearing section can be eliminated.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 2 and 3 are diagrams showing a ninth embodiment of the present invention. Of these, FIG. 2 is a diagram showing a measuring mechanism in the unbalance tester employed in the present invention. This mechanism has bearing parts 12, 13, 14 at predetermined positions in the longitudinal direction.
Both ends of the rotating shaft body 10 having a V? are supported by sleep bearings 2 and 3. On the other hand, the bearing portion 13 of the rotating shaft body 1 is supported by the bearing 28, and the sleeve bearings 2, 3
．． and bearings 28, respectively, with elastic parts 10, 17,
15, and a pickup 11, 18, 16 is connected to each bearing 2, 3, 28, and these pickups 1i, ia, 16 detect the vibration of each part and measure the unbalance. There is. 1) The rotor 5 of the bearing 3 has joint parts 20, 2
A universal joint (1) 19 having a universal joint (1), a boo (1) 19 which is pivotally connected to this universal joint 19, which is connected to this pulley 22 via a bell) (23), and is fixedly connected to the output shaft 26 of the motor 3. It is operatively connected to the motor 2 via a pulley 24, and receives the driving force of the motor 3 to rotate the rotary shaft body 1 at high speed. Further, a reference signal generator 27 is connected to the pickup 5, so that a phase change between the sleeve bearing 3 and the rotating shaft body 1 can be detected, while each pickup 11, 16, 18
is electrically connected to a storage circuit not shown.

After loading the rotating shaft body 1 into the unbalance tester 6, (4) First, the rotating shaft body 1 is rotated by the drive of the motor b, and each pickup 11, 16 at that time.

Measured values on each bearing surface based on the detected values of 18 are stored in a storage circuit.

(G) Next, leave one sleeve bearing (for example, sleeve bearing 3) as it is, and after installing the connection between the other sleeve bearing 2 and the rotating shaft body 1 by reversing the connection gls by 180', The rotating Mb 1 is rotated, and the measured values of each bearing surface at that time are stored in the memory circuit.

(0 Furthermore, the sleeve bearing 2 is left as it is, and the connection 218 between the sleeve bearing 3 and the rotating shaft body 1 is
After inverting it by 0° and installing it, rotate the rotating shaft body 1,
The measured values of each bearing surface at that time are stored in a memory circuit.

The amount of eccentricity compensation for each surface is calculated based on the measured value obtained through this reversal operation, and this is stored in the storage circuit. When measuring the unbalance of the rotating shaft body 1, the eccentricity compensation amount is added to the unbalance amount on each surface detected by the circuit for measuring this unbalance, and after being calculated, the eccentricity compensation amount is calculated. The unbalance of only the rotary shaft body 1 from which is removed is obtained.

A measuring circuit that detects the amount of unbalance and compensates for eccentricity based on the signals from the pickups ii, 16, and 18 is shown in FIG. In this diagram,
The pickups 11, 16, 18 are connected to unbalance detection circuits 29, 30, 31, respectively,
These unbalance detection circuits 29 and 313.

31 is connected such that the output signal therefrom is input to a modified surface separation and sensitivity circuit 32. Further, the reference signal generator 27 connected to the sleeve bearing 3 is connected to each non-clearance detection circuit 4, 30.31, and sends a signal indicating the reference phase to these circuits. unbalance detection circuit 29,
Each pickup 11 detected by 30 and 31
, 16, and 18 are input to the correction surface separation and sensitivity circuit 32, and are converted into unbalance ratios at each correction surface A, I), O to be performed in the unclear correction 2. Ru. Further, the correction surface separation and sensitivity circuit 32 outputs an unbalance signal corresponding to each correction surface, and inputs it to eccentricity compensation circuits 33, 34, and 35, which are also provided corresponding to each correction surface. A compensation amount storage circuit 36 is connected to each of these eccentricity compensation circuits 34, 35, and each display meter 37, 38.

39 are connected. The compensation amount storage circuit 36 stores the magnitude and direction of the eccentricity compensation amount obtained by the reversal test. Therefore, the rotating shaft body 1
When measuring unbalance, the eccentricity compensation amount is added to the unbalance amount on each surface detected by the correction surface separation and sensitivity circuit 32 in the eccentricity compensation circuits 33, 34, and 35. As a result, the display meters 37, 38, 3
9 displays the unbalance of only the rotating shaft body 1 with the eccentricity equivalent removed. Therefore, this display meter 37
．． Each correction plane A, B, according to the indicated value of 38°39
If we correct the unbalance in CK, will the unbalance be caused only by the rotating shaft body 1? Can be fixed.

In addition, in order to compensate for eccentricity in unbalance measurement using the method described above, the sleeve bearing 2 must be
It is necessary to maintain the same phase relationship between the sleeve bearing 3 and the sleeve bearing 3 at all times.

As explained above, according to the present invention, when measuring unbalance using an unbalance tester, a reversal test is performed to determine the amount of eccentricity compensation between the rotating shaft and the sleeve bearing that supports it. , calculate the eccentricity compensation amount to be engraved on each correction surface on the rotating shaft body based on the measured value obtained in each reversal test, and add this eccentricity compensation amount to the measured value of the unbalance to measure the unbalance. Since the amount equivalent to eccentricity is removed from the value, it is possible to prevent the influence of eccentricity between the rotating shaft body and the sleeve bearing from affecting the unbalance correction on each correction surface.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a general configuration in which a rotating shaft body is supported by a sleeve bearing and unbalance measurement is performed. The second FA is a schematic explanatory diagram showing a configuration for measuring imperfections in a rotating shaft body in which the eccentricity compensation method of the present invention is adopted. FIG. 3 is a block diagram showing an unbalance measurement circuit employing the eccentricity compensation method of the present invention.

Claims (1)

[Scope of Claims] A rotating shaft body having a bearing portion in its longitudinally intermediate portion is supported by sleep bearings at both ends thereof, and the bearing portion in the intermediate portion is supported by a third bearing, and In the method of correcting the amount of misalignment of the rotating shaft by connecting a pickup and rotating the rotating shaft, the rotating shaft is rotated and the misalignment measured by each pickup at that time is memorized. , In one sleep bearing, after reversing the reading of the bearing and the rotating shaft body by 1800 degrees and installing it, rotate it with the rotating shaft body, memorize the unbalance measurement value by each pickup at that time, and install it on the other sleep bearing. , the connection between the bearing and the rotating shaft was reversed 1800 degrees and installed, the rotating shaft was rotated, the unbalance measurement values from each pickup at that time were memorized, and the measured values obtained in each of the above reversal tests were used. Based on this, the amount of eccentricity compensation corresponding to each correction hit on the rotating shaft body is calculated, and this eccentricity compensation f+1 is added to the unbalance measurement value, thereby removing the amount equivalent to eccentricity from the unbalance measurement value of all correction surfaces. An eccentricity compensation method in unbalance measurement, characterized in that: