JPS59220622A - Torque detector - Google Patents

Abstract

PURPOSE:To adjust the initial value of a phase difference to a desired value by providing a phase adjustment circuit section having a phase adjuster, a frequenty-voltage converter and a saw-tooth wave generation circuit. CONSTITUTION:As an output shaft 10a rotates with the clutch 13 disengaged, a rotor 20 rotates with the transmission of a rotating force of a rotor 10 through plate springs 30. In such a case, despite a non-load state, when there is a phase difference (to) between the falling of a rotation angle (a) generated from a shaping circuit 51 connected to an electromagnetic pickup head 43a and the falling of a rotation angle signal (b) generated from a shaping circuit 51, a square wave signal (d) from a comparator 55 and a rotation angle signal (b) from the shaping circuit 51 are ORed with an OR gate 56 by adjusting a voltage VR of a phase adjuster 54 with an adjusting screw 54a to generate a correction circuit signal (e). Thus, the phase difference (to) is brought to zero or a specified value initially at a high accuracy with ease.

Description

[Detailed description of the invention] The present invention relates to a torque detection device.

Conventionally, a torque detection device is connected, for example, between a driving side output shaft and a driven side input shaft disposed coaxially with this output shaft, so that when the output shaft rotates, there is a gap in the output shaft. detects the phase difference between the rotation angle of the output shaft and the rotation angle of the input shaft corresponding to this rotation angle; There is a device constructed by a torque signal ordering means that generates a torque signal representing the torque corresponding to the amount of elastic deformation of the torque signal.

However, in such a configuration, for example, a pair of rotating bodies are attached to the output shaft and the input shaft, respectively, facing each other, and the phase difference between the rotation angles of these two rotating bodies is detected by the torque signal generating means. Therefore, there is a problem in that the initial value of this phase difference is difficult to define due to variations in each torque detection device due to mounting errors of the two rotating bodies with respect to the output shaft and the input shaft.

The present invention has been made to address these problems, and an object of the present invention is to provide a torque detection device that adjusts the initial value of the above-mentioned phase difference to a desired value. .

In order to achieve such an object, a structural feature of the present invention is that in the above-mentioned torque detection device, the torque signal generating means includes an adjusting means for adjusting the initial value of the phase difference to a desired value. , the phase difference is detected in relation to the adjustment result by the adjustment means.

By configuring the present invention in this manner, even if an inappropriate initial value of the above-mentioned phase difference occurs, the initial value of this phase difference can be easily and accurately adjusted only by the adjustment means. It can be adjusted to a desired value, and as a result, appropriate torque detection is always possible.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
The figure shows an example of a vehicle torque detection device to which the present invention is applied. This torque detection device is a torque sensor S
The torque sensor S includes a rotating body 10 and an annular rotating body 20 facing the rotating body 10.

The rotary body 10 is fitted with its annular boss 11 into the end shaft support of the output shaft 10a of the vehicle prime mover, and the plurality of bolts 12-
12, and the rotating body 20 is fitted at its inner peripheral edge 21 into the stepped portion 11a of the annular boss 11 so as to be rotatable relative thereto but immovable in the axial direction.

As shown in FIGS. 1 and 2, a plurality of leaf springs 30 to 30 are arranged between the two rotating bodies 10 and 20, with their respective ends connected to the outer periphery of the annular boss 11 and the annular stepped portion of the rotating body 20. 22 and are radially connected at equal angular intervals and in the radial direction, and each of these leaf springs 30 to 30 is applied to the rotating body 20 when the clutch 13 is engaged while the rotating body 10 rotates. Deflection occurs in the opposite direction to the rotating body 10 depending on the load. In this case, the amount of deflection of each leaf spring 30 to 30 corresponds to the torque of the prime mover. The clutch 13 has its input shaft 13a disposed coaxially with the output shaft 10a, and when engaged, the clutch plate 13b is pressed against the back surface of the rotating body 20 by the thalassochi facing 13C. rotates integrally with.

A plurality of protrusions 14 are provided on each outer peripheral edge of both rotating bodies 10.20.
．． 23 are formed at equal angular intervals at angular positions corresponding to each other, and each of these protrusions 14, 23 is provided with a detection mechanism 40, which constitutes a main part of the present invention, on the clutch housing 1.
3b and facing each other. The detection mechanism 4o has a casing 41, and the casing 41 connects a pair of cylinder parts 41a and 41b to both rotating bodies 1o and 2, respectively.
The flange portion 41c is inserted through the clutch housing 13b so as to face each protrusion 14.23 of 0.
(see FIG. 3) is fastened and assembled to the clutch housing 13b with a plurality of screws 42-42. In addition, in FIG. 1, the reference numeral 24 indicates a ring gear.

Inside the cylindrical parts 41a and 4Ib of the casing 41, a pair of electromagnetic pink amplifier heads 43a and 43b are installed, respectively.
It is inserted so as to face both protrusions 14 and 23 through the respective tip openings of both cylindrical parts 41a and 41'b and to form a magnetic relationship with these protrusions. Thus, when the electromagnetic pink amplifier head 43a sequentially faces each protrusion 14 of the rotating body 10, it sequentially magnetically detects each protrusion 14 and generates a series of detection signals, while the electromagnetic pink amplifier head 43b When facing each of the protrusions 23 in sequence, each of these is sequentially detected magnetically and generated as a series of detection signals. Note that each detection signal from the electromagnetic pink amplifier head 43a is
The waveform is shaped by a shaping circuit (not shown) and sequentially generated as a rotation angle signal a (see FIG. 5).

Further, on the wiring board 44 assembled in the casing 41, a phase adjustment circuit section M constituting the main part of the present invention is wire-connected, and this phase adjustment circuit section M is as shown in FIG. , a shaping circuit 51 connected to the electromagnetic pink-up head 43b, a frequency-voltage converter 52 (hereinafter referred to as F-V converter 52) connected to this shaping circuit 51, and shaping circuit 51 and F-V converter 52. The sawtooth extraction generating circuit 53 is connected to the sawtooth extraction generating circuit 53. The shaping circuit 51 shapes the waveform of each detection signal from the electromagnetic assemblies 43b and generates a rotation angle signal b (see FIG. 5). F-V converter 5
2 converts the frequency of each rotation angle signal from the shaping circuit 51 into an analog voltage proportional to the frequency.

The sawtooth generation circuit 53 includes an operational amplifier 53a, resistors 53b and 53C, a capacitor 53d, and an analog switch 53e.
In response to the fall of each rotation angle signal 2 from the shaping circuit 51, the gate is opened, and the resistor 53b and capacitor 53. A charging circuit is formed between the resistor 53C and the capacitor 53d, the gate is closed in response to the rise of each rotation angle signal, and a discharging circuit (having a smaller time constant than the charging circuit) is formed between the resistor 53C and the capacitor 53d. to form. Operational amplifier-53
a. At the same time as forming the charging circuit, the F-V converter 52
A rising waveform portion of the sawtooth wave signal C (see FIG. 5) is formed in response to an analog voltage from the sawtooth wave signal C (see FIG. 5), and a falling waveform portion of the sawtooth wave signal C is formed at the same time as the discharge circuit is formed. In such a case, the slope of the rising waveform portion of the sawtooth wave signal C, that is, the charging speed of the charging circuit is determined in proportion to the analog voltage from the F-V converter 52, and the charging time of the charging circuit is determined in proportion to the shaping circuit. Since the peak value Vp of the sawtooth wave signal C is determined inversely proportional to the frequency of each rotation angle signal C from 51, the peak value Vp of the sawtooth wave signal C can be determined by appropriately setting each of the proportional and inverse proportional constants.
(see FIG. 5) is made constant regardless of the frequency of the rotation angle signal.

The phase adjuster 54 is composed of a potentiometer.
Under the adjustment of the adjustment screw 54a (see Figures 1 and 3), the voltage supplied from the DC power supply is divided, and the slider 54b
A phase adjustment voltage VR is generated from the phase adjustment voltage VR.

In such a case, the adjustment of the adjustment screw 54a is performed using the casing 41.
This is done through an opening 41d provided in the earthen wall. The comparator 55 converts the sawtooth wave signal C from the sawtooth wave generation circuit 53 into a phase adjustment voltage V from the phase adjuster 54.
R, when the level of the sawtooth wave signal C is lower than the phase adjustment voltage VR, a rectangular wave signal d (see FIG. 5) is generated, and the level of the sawtooth wave signal C is lower than the phase adjustment voltage V.
When higher than R, the rectangular wave signal d disappears. this place
・In this case, the fall of the rectangular wave signal d is smaller than the fall of the rotation signal S from the shaping circuit 51, and the phase difference to (5th
The rotation angle difference θ corresponding to this phase difference to remains constant regardless of changes in the rotation speed (that is, the frequency of the rotation angle signal) under the same load of the prime mover. The OR gate 56 receives each rotation angle signal from the shaping circuit 51 and the rectangular wave signal d from the comparator 55, and generates a corrected rotation angle signal e (see FIG. 5). In this case, the fall of the corrected rotation angle signal e coincides with the fall of the rectangular wave signal d. In FIG. 1, reference numeral 60 indicates a torque signal generation circuit, and this torque signal generation circuit 60 is connected to the OR gate 56 and the electromagnetic pinsocket by a connector 61 connected to the wiring board through the opening 41e of the casing 41. It is connected to the heel 41a.

In this embodiment configured as described above, the clutch 13
When the output shaft 10a rotates in the disengaged state, the rotating body 2
0 rotates by transmitting the rotational force of the rotating body 1o through each leaf spring 3°0 to 30. When overcasting, each plate has 30 to 3
Even though the output shaft 10a is not bent under the rotation of the output shaft 10a under no load, the rotation angle signal a generated from the shaping circuit connected to the electromagnetic pick amplifier head 43a falls due to the shaping circuit 51. As shown in FIG. 5, there is a phase difference to(
(which can be determined by an appropriate waveform observation means), the phase adjustment voltage VR generated from the phase adjuster 54 is slightly adjusted by the adjustment screw 54a, and the sawtooth wave generation circuit 53 is changed to the shaping circuit 51. While adjusting the intersection point between the level of the sawtooth wave signal C generated by the cooperation with the F-V converter 52 and the phase adjustment voltage The rectangular wave signal d generated by the cooperation and the rotation angle signal S from the shaping circuit 51 are logically summed by an OR gate 56 to generate a corrected rotation angle signal e. In other words, due to the assembly error of the p1 rotary body 10.20 and the machining error of each protrusion 14°23, both rotary bodies 1 Each protrusion 14.0.20 corresponds to each other.
There is a difference in the angular position between the two electromagnetic pink-up heads 4.3a and 43b, and the two rotation angle signals a,
Even if a phase difference to occurs as shown in FIG. 5 between each falling edge of b, the phase difference to can be initially accurately adjusted only by adjusting the phase adjuster 54, regardless of the rotational speed of the rotating body 10. It can be easily made zero. In such a case, after assembling both rotors 10 and 20 to the input and output shafts, the phase adjuster 5
Since the phase can be adjusted by adjusting step 4, both rotating bodies 10
, 20 and the assembly accuracy of both rotating bodies 10 and 20 may be low, leading to a reduction in production costs. Further, the phase adjuster 54
Since the torque detection device is installed in the casing 41 assembled in the casing 41 so as to be easily adjusted from the outside, after the torque detection device is assembled, the phase can be adjusted on the spot while observing the rotational state of the input/output shaft, which improves work efficiency. Helpful for improvement.

In such a state, when the load increases due to the engagement of the flange 13, each of the plate springs 30 to 30 is deflected accordingly, and the phase difference between the protrusions 14 and 23 of both rotating bodies 10 and 20 is reduced. As a result, a phase difference also occurs between each falling edge of the rotation angle signal a and the corrected rotation angle signal e. Then, the torque signal generation circuit calculates the phase difference t in response to the rotation angle signal a and the corrected rotation angle signal e, and calculates the linear relationship τ between the predetermined phase difference t and torque (hereinafter referred to as torque τ). -Kt/T (6th
(see figure), calculate the torque τ according to the calculated phase difference t,
This is generated as a torque signal.

In such a case, as mentioned above, the falling phase difference between the two rotation angle signals a and b has been initially adjusted so that it becomes zero when no load is applied, so the torque signal value is accurately proportional to the amount of deflection of each plate spring by 3 degrees. It becomes what it is.

In the above embodiment, a case was described in which the phase difference between the rotation angle signals a and b in the no-load state is initially adjusted to zero, but instead of this, the phase difference between the rotation angle signals a and b may be The phase difference under load may be initially adjusted to a predetermined value.

Furthermore, in carrying out the present invention, any detection means that detects torque based on the phase difference between a pair of rotating bodies is not limited to one that employs an electromagnetic pink up head. By applying and carrying out the present invention, the same effects as those of the above-mentioned embodiments can be achieved.

Furthermore, in the embodiment described above, an example has been described in which the phase adjustment circuit section M adjusts the phase of the detection signal from the electromagnetic associator 4.3b. Alternatively, the phase of the detection signal may be adjusted.

Further, in the above embodiment, an example in which the present invention is applied to a torque detection device for a vehicle has been described, but the present invention is not limited to this, and the rotation between the drive side output shaft and the driven side input shaft is The present invention can be applied to detecting an angular phase difference as torque.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the torque sensor, and FIG.
The figure shows a partially enlarged fractured surface of the 1-lux sensor, FIG. 3 is a fractured plan view of the detection mechanism, FIG. 4 is an electrical circuit diagram of the phase adjustment circuit in FIG. 1, and FIG. The output waveform diagram of each circuit element and FIG. 6 are graphs showing the relationship between phase difference and torque. Explanation of symbols 10a... Output shaft, 13a... Input shaft of tip/7 tip, 30... Plate blade, 4o... Detection mechanism, 43a, 4
3b...Electromagnetic pressure assembly, 54...Phase adjuster, Go...Torque signal generation circuit, M...Phase adjustment circuit section. Applicant: Japan Auto Parts Research Institute Co., Ltd. (and others)
Name) Agent Patent Attorney Teru Hase - Figure 5 h Figure 6

Claims (1)

[Claims] an elastic member connected between a driving-side output shaft and a driven-side input shaft disposed coaxially with the output shaft, and elastically deforms in response to a load applied to the input shaft when the output shaft rotates; The phase difference between the rotation angle of the output shaft and the rotation angle of the input shaft corresponding to this rotation angle is detected, and this detection result is converted into a torque signal representing the torque corresponding to the amount of elastic deformation of the elastic member. In the torque detection device, the torque signal generating means is provided with an adjusting means for adjusting the initial value of the phase difference to a desired value, and the torque signal generating means is provided with an adjusting means for adjusting the initial value of the phase difference to a desired value, and the adjustment by the adjusting means is A torque detection device characterized in that the phase difference is detected in relation to a result.