JPH07101191B2 - Phase shift detection device in torque converter unbalance measuring device - Google Patents

Description

The present invention relates to a phase shift detection in an unbalance measuring device of a torque converter for measuring an unbalance of a torque converter that transmits torque from an internal combustion engine to a driven side. Regarding the device.

[Prior Art] A conventional torque converter unbalance measuring method is to set a torque converter in which an inner member made up of a turbine impeller and a stator impeller is assembled inside an outer member made up of a pump impeller and an input case as a measuring device. Then, the outer member and the inner member are integrally rotated to measure the total unbalance of both, and the imbalance is fixed to a part of the outer member based on the measurement result. Is corrected (for example, JP-A-59-65660 and JP-A-63-40829).

However, when the torque converter is actually used, the outer member and the inner member rotate independently. Therefore, in the conventional method for measuring the total imbalance between the outer member and the inner member, the unbalance of the outer member itself is not measured. It is difficult to measure the balance precisely. As a result, if the balance weight for unbalance correction is fixed to the outer member, the balance state may be further deteriorated.

In order to avoid such an inconvenience, the outer member and the inner member are rotated in a state in which they are coupled with each other in a predetermined phase.
After the second measurement, the rotation is temporarily stopped and the phases of the outer member and the inner member are changed by a predetermined angle to couple them, and then both members are rotated again to perform the second measurement, and the second measurement is performed. It is conceivable that the unbalance caused by the inner member may be canceled and the unbalance caused by the outer member may be obtained by performing arithmetic processing on the measurement result of 1.

[Problems to be Solved by the Invention] However, the torque converter includes an input case, a pump impeller, a turbine impeller, and a stator impeller, and the stator impeller is driven by the drive shaft via the one-way clutch to the turbine impeller. The rotation is transmitted from the car. For this reason, at the time of measurement, torque is transmitted in one rotation direction and the stator impeller does not transmit torque in the other direction.However, when the torque converter is accelerated or decelerated, the stator impeller exerts a force in the free direction. There is a problem that it will rotate when it rotates, and because the stator impeller also has an unbalanced amount, this rotation changes the unbalanced direction on the inner side, which reduces the measurement accuracy. It was

The present invention, in the unbalance measuring device for solving the above-mentioned problems, prevents the phase of the stator impeller and the turbine impeller on the inner side from changing, and on the other hand, shifts the phase relatively on the pump impeller side. An object of the present invention is to provide a phase shift detecting device in an unbalance measuring device of a torque converter, which contributes to confirmation of the unbalance amount by confirming the displacement amount.

[Means for Solving the Problems] In order to solve the above problems, the present invention has an inner member and an outer member that are coupled via a one-way clutch, and the inner member and the outer member are first and second members. Second
In an unbalance measuring device for a torque converter connected to respective rotating shafts of the inner member and the outer member, the inner member and the outer member are synchronously rotated, and after the synchronous rotation, the inner member and the outer member are relatively out of phase with each other. From the second encoder based on the detection signals detected by the first encoder, two motors for rotating the inner member and the outer member, respectively. A counter for counting output detection signals; a rotational phase changing means having a thinning rate changing circuit for shifting the reference detection signal to shift the phase; and a rotating phase changing means for the inner member and the outer member. Via the detected value of the counter during the first synchronous operation and the rotation phase changing means. Characterized in that it comprises a comparing means for comparing the detected value of the counter at the second round of the synchronous operation after the phase-shifted with the inner member and the outer member.

[Operation] According to the phase shift detecting device in the unbalance measuring device of the torque converter according to the present invention, the outer member and the inner member, which are integrally coupled, are accelerated to the rotation speed to be measured, and then the rotation speed is changed. The number of pulses detected by the first and second encoders is measured through the counter for the first time while keeping the same, that is, in the state of synchronous rotation. Next, by slightly increasing or decreasing the rotation on the inner member side and the rotation on the outer member side,
The phase between the inner member side and the outer member side is shifted by the rotation phase changing means. After that, the outer member and the inner member are synchronously operated again. Here, the second measurement is performed via the counter. Then, it is measured from the count value of the first counter and the count value of the second time whether or not the phase shift is within the allowable range.

[Embodiment] Next, a preferred embodiment of the phase shift detecting device in the unbalance measuring device for a torque converter according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a sectional view showing the structure of a torque converter. This torque converter 10 has a large number of blades on its inner surface.
A bowl-shaped pump impeller 12 that forms 12a, and the pump impeller 12
And a bowl-shaped input case (14) that is integrally coupled to the above and constitutes the outer shell of the torque converter (10). The pump impeller
Inside the 12 and input case 14, there are a number of blades 16a
A turbine impeller 16 having a pump impeller 12 and a turbine impeller 12 for cooperating with the turbine impeller 16 to form an impeller chamber 18.
A stator impeller 20 having a large number of blades 20a arranged between 16 is arranged. The pump impeller 12 and the input case 14 constitute an outer member O that forms an outer shell of the torque converter 10, and the turbine impeller 16 and the stator impeller 16 are provided.
Reference numeral 20 constitutes an inner member I that is housed inside the outer member O and rotates relative to the outer member O.

A cylindrical portion 12b coaxial with the rotation axis of the pump impeller 12 is provided so as to extend in the axial direction (upper side in the drawing), and a turbine blade is provided in the central portion of the input case 14. A bag-shaped bearing portion 14a for rotatably supporting an end of an output shaft (not shown) inserted into the torque converter 10 so as to be coupled to the wheel 16 and the stator impeller 20 is provided in a protruding manner.

The turbine impeller 16 has a cylindrical output portion 16c in which a spline 16b for spline coupling to the output shaft is formed in the central portion, and the output portion 16c is a thrust bearing near the central portion of the input case 14. Supported via 22. The stator impeller 20 has a one-way clutch 24 at its radial inner end, and a thrust bearing 26 is provided between the outer ring portion 24a of the one-way clutch 24 and the pump impeller 12, and Thrust bearings 28 are respectively interposed between the outer ring portion 24a and the turbine wheel 16. A spline 24c for spline coupling to the output shaft is formed on the inner ring portion 24b of the one-way clutch 24. Then, in order to rotationally drive the outer member O of the torque converter 10, the input case
At 14, a drive plate 30 connected to the engine is mounted.

FIG. 2 shows the structure of the unbalance measuring device. On the upper surface of the measuring table 34 which is horizontally supported on the base 32, a turntable 38 which is rotationally driven by a first driving motor 36 is provided. The input case 14 of the torque converter 10 is held above the turntable 38 with its axis aligned with the rotation axis of the turntable 38.

An elevating arm 42 that is connected to a drive source (not shown) and moves up and down is slidably supported on a column 40 that is erected on the side of the measuring table 34, and a second end is provided at the tip of the elevating arm 42. A drive motor 44 is provided. The output shaft of the second drive motor 44 is arranged coaxially with the rotation shaft of the turntable 38 and is inserted from above into a cylindrical portion 12b formed in the center of the pump wheel 12 of the torque converter 10. 46 is attached. Also, an encoder is provided on the side of the first drive motor 36.
50 is connected, and an encoder 48 is provided on the second drive motor 44 side.
Are combined.

As is apparent from FIGS. 3 and 4, the drive shaft 46
Is the first step portion 4 that fits into the bag-shaped bearing portion 14a from the lower end portion.
6a, the second step portion 46 fitted to the output portion 16c of the turbine impeller 16
b, the third step portion 46 fitted to the inner ring portion 24b of the one-way clutch 24
c and a shaft portion 46d fitted to the cylindrical portion 12b of the pump impeller 12. A key 46e engageable with the spline 16b formed on the output portion 16c of the turbine impeller 16 is formed on the second step portion 46b of the drive shaft 46, and the third step portion 46c is formed.
A key 46f that can be engaged with a spline 24c formed on the inner ring portion 24b of the one-way clutch 24 is formed therein. Therefore, the drive shaft 46 inserted into the torque converter 10 is rotatable relative to the pump impeller 12 and the input case 14 that form the outer member O, and the turbine impeller 16 and the stator that form the inner member I. The impeller 20 can rotate integrally.

A measuring device 52 for measuring the unbalance of the torque converter 10 is arranged inside the base 32, and the measuring device 52 and the first and second drive motors 36, 44 are controlled by a microcomputer. It is connected to the device 54. Then, normally, the first drive motor 36 and the second drive motor 44 are driven at the same rotation speed in synchronization with each other, and in the process of measurement, the second drive motor 36 with respect to the phase of the first drive motor 36.
The phase of 44 is controlled to be displaced by 180 °.

The waveform shaping circuit 128 and the Z phase count control 1
Reference numeral 30 is for detecting a motor synchronization deviation, and rotation direction determination circuit 132 is for determining the rotation direction of the motor.

In the above configuration, first, the turbine impeller 16 and the stator impeller 20 that form the inner member I are integrally assembled inside the pump impeller 12 and the input case 14 that form the outer member O, and the outer member O The torque converter 10 is set on the turntable 38 of the measuring device 52 in a state where the inside of the is filled with oil in advance. Then lift arm
42 is lowered, the key 46e formed on the second step portion 46b is engaged with the spline 16b of the output portion 6c of the turbine impeller 16, and the key 46f formed on the third step portion 46c is connected to the one-way clutch 24. Engage with the spline 24c of the inner ring portion 24b.

When the first drive motor 36 and the second drive motor 44 are started from this state, the turntable 38 and the drive shaft 46 start to rotate integrally with each other in synchronization with each other, and the rotational speed of the torque converter 10 gradually increases. That is, first, a speed command is issued to the outer motor. As a result, the outer encoder 50 outputs a pulse proportional to the rotation. This pulse is first shaped by the waveform shaping circuit 104, multiplied by n by the multiplication circuit 106, and then the pulse thinning circuit 108.
To 1 / n. This is used as a motor speed command signal for the inner motor (at this time, the inner and outer motors are set to have the same speed). This motor speed command signal is applied to the outer motor as a control signal for the outer motor, and at the same time, the gate circuit 11
When supplied to the deviation counter 112 via 0 and input to the inner servo amplifier 114, the inner motor rotates in synchronization with the outer motor.

In this case, during normal rotation, the pulse thinning circuit 108
And is supplied to the deviation counter 112, the voltage corresponding to the deviation is supplied to the servo amplifier 114, and the motor 44 rotates.

At this time, in the circuit inside the control device 54 shown in FIG.
The U78 resets the counter 72 that counts the pulses from the encoder 48 via the I / O interface 74.
Further, the CPU 78 sends a clear signal to the latch 86 and the latch 90 of the encoder input circuit shown in FIG. 6 via the I / O interface 74 while the torque converter 10 is synchronously rotating. , The latches 86 and 90 are set to the input acceptance state.

Here, the Z-phase signal of the encoder 50, that is, the origin signal is input to the waveform shaping circuit 82, and its output is output as the output Q of the latch 86. As a result, the gate circuit 92 opens and the gate circuits 94 and 96. Also, the A-phase and B-phase pulses of the encoder 48 are supplied to the counter 72.

Next, the Z-phase signal of the encoder 48, that is, the origin signal is input to the waveform shaping circuit 84, and the output thereof outputs the gate circuit 88.
Opens, inverts the output of latch 90, closes gate circuit 92, and closes gate circuits 94, 96. The counter 72 keeps counting until the latch 90 is inverted as described above, and the inverted signal Q of the latch 90 is used as the completion signal for the I / O interface 7
It is sent to the CPU 78 via 4.

Upon receiving this completion signal, the CPU 78 sets the value of the counter 72 to I
Stored in memory 80 via / O interface 74. Further, the CPU 78 displays the stored value on the external display 76 via the I / O interface 74, and sends a reset pulse to the counter 72 and the latches 86, 90.

The above operation is performed a preset number of times, and the CPU 78 calculates the average value (Kn) of the count results of the counter 72. In this way, when the first measurement is completed, the signal set by the shift amount setting switch 116 is supplied to the sequencer 118, and the sequencer 118 outputs a 180 ° phase shift command, which causes the thinning rate changing circuit.
By 120, the thinning rate of the pulse thinning circuit 108 is increased. Then, the number of pulses of the pulse thinning circuit 108 is increased by a fixed ratio, and the motor speed is increased. This time,
Similarly to the pulse thinning circuit 108, the pulse thinning circuit 122 also increases the thinning rate, and the counter 124 counts the thinning amount. The comparator 126 compares the counter value with a value corresponding to the number of pulses when the 180 ° phase is changed by the shift amount setting switch 116. If they match, the comparator 126 sends a phase shift completion signal to the sequencer 118. As a result, the phase shift command is turned off, the thinning rate is set to 0, and synchronization is performed again.

Then, the second measurement is performed.

In this way, the inner member I and the outer member O are intentionally shifted and the average value (Ln) is obtained as described above.

Then, by subtracting the previous average value (Kn) from the subsequent average value (Ln), the advance amount corresponding to the phase shift can be obtained.

These time charts are shown in FIG. In general,
Compared to the previous measurement, the phase at this measurement is 180 °
They are deviated, that is, the phase advance amount should be 180 °. However, if there is a significant imbalance between the inner and outer parts, the amount of advance of this phase will be 180
Deviate more than in the vicinity.

In this case, when the amount of advance angle is outside the predetermined standard, it is determined that the phase shift is abnormal, and it is displayed outside.

That is, as is apparent from FIG. 9, the vector C indicating the unbalance of the entire torque converter 10 detected in the first measurement is caused by the vector A indicating the imbalance caused by the inner member I and the vector C indicating the imbalance caused by the outer member O. Is expressed as the sum of the vector B indicating the unbalance (including the unbalance caused by the oil with which the outer member O is filled). In addition, the torque converter detected in the second measurement
The vector C'indicating the unbalance of the whole 10 is a vector A'indicating the imbalance due to the inner member I and a vector B indicating the imbalance in the outer member O.
Expressed as the sum of.

At this time, in the first measurement and the second measurement, the phase
The unbalance (vectors A and A ') caused by the inner member I shifted by 180 ° have the same absolute value and opposite directions, whereas the unbalance (vector B) caused by the outer member O becomes equal. . This is also a vectorial shift due to the imbalance, so
The presence of imbalance is recognized as the relative advance amount of the phase.

[Effect of the Invention] According to the unbalance measuring device for a torque converter of the present invention, the outer member and the inner member are independently rotated, one rotation speed is slightly increased from the other rotation speed, and the target phase is set. By setting it correctly, it is possible to confirm the phase shift between the inner side and the outer side, and finally measure the presence or absence of imbalance.

[Brief description of drawings]

1 to 9 are diagrams according to an embodiment of the present invention, FIG. 1 is a sectional view showing a structure of a torque converter, FIG. 2 is a diagram showing a structure of an unbalance measuring device, FIG. 3 is an enlarged perspective view of the drive shaft, FIG. 4 is a sectional view of the torque converter with the drive shaft inserted, FIG. 5 is a circuit block diagram in the control device, and FIG. 6 is an input for the encoder. Circuit block diagram, time charts of the circuits shown in FIGS. 7 and 5, FIG. 8 is a block diagram of a circuit for changing the advance amount of the motor, and FIG. 9 is a diagram showing measurement results. 10 …… Torque converter, 12 …… Pump impeller 14 …… Input case, 16 …… Turbine impeller 20 …… Stator impeller, 24 …… One-way clutch 36 …… First drive motor, 44 …… Second Drive motor 48, 50 ... Encoder, 52 ... Measuring device 54 ... Control device, I ... Inner member O ... Outer member

Continued Front Page (72) Inventor Akihiro Sato 1-10-1 Shin-Sayama, Sayama-shi, Saitama Honda Engineering Co., Ltd. (56) Reference JP-A-4-6432 (JP, A)

Claims (1)

[Claims] 1. An unbalance measuring device for a torque converter, comprising an inner member and an outer member coupled via a one-way clutch, wherein the inner member and the outer member are connected to first and second rotating shafts, respectively. Two motors that rotate the inner member and the outer member in synchronization and, after the synchronous rotation, rotate the inner member and the outer member with a relative phase shift, and the inner member and the outer member First and second encoders for respectively detecting the rotation speeds of the two, a counter for counting the detection signals output from the second encoder with the detection signal detected by the first encoder as a reference, and the phase shifting In order to change the speed with respect to the reference detection signal, a rotation phase having a thinning rate changing circuit The changing means, the detected value of the counter during the first synchronous operation of the inner member and the outer member, and the second value after shifting the phase of the inner member and the outer member via the rotational phase changing means. A phase shift detecting device in an unbalance measuring device for a torque converter, comprising: a comparing means for comparing the detected value of the counter at the time of the second synchronous operation.