JPS6079241A - Torque detecting apparatus - Google Patents

Abstract

PURPOSE:To obtain a torque detecting apparatus hardly generating the peel-off of the magnetostriction material formed to a shaft to be measured to which torque is applied, excellent in durability and good in stability and detection sensitivity, by covering a high magnetic permeability film with a non-magnetic protective film so as to secure the high magnetic permeability film to the shaft to be measured. CONSTITUTION:The magnetostriction film 2 formed to the shaft surface part of a shaft 1 to be measured comprises an amorphous magnetic alloy and has high magnetic permeability and large magnetostriction effect. Both end parts of the non-magnetic protective film 3 formed to the outer periphery of the magnetostriction film 2 are integrally welded with the protective film 3, the magnetostriction film 2 and the shaft 1 to be measured by the irradiation of electron beam 4. In addition, an exciting coil 9 and a detection coil 10 are arranged to the outer periphery of the protective film 3 so as to be closely contacted therewith in coaxial relation to the shaft 1 to be measured an the coils 9, 10 are covered with a yoke 11 so as to leave minute intervals from the shaft 1 to be measured. When a high frequency current is flowed to the exciting coil 9, magnetic flux is generated from the coil 9 and a magnetic circuit passing the yoke 11 and the magnetostriction film 2 is formed. When twist torque is applied to the shaft 1 to be measured, the magnetic flux in the detection coil 6 is changed while induced electromotive force changes and detection output is obtained.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates directly to a magnetostrictive 1-lux detection device, which has particularly good durability, stability, and high detection sensitivity.
・Related to the lux detection device.

(The back of the invention) For the axis to be measured, such as a rotating axis or a fixed axis!・When adding torque, the axis element (54 d〒) becomes λ11 on the surface of the center J ream 111111 of the measured axis.
I'm here.

To detect the torque applied to the shaft to be measured using the magnetostrictive torque (σ) output device Ff, It is preferable to concentrate the axial surface of the measuring axis on the axial surface of the measured axis (4 points, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y, y)) 1, y 1 ゜And conventionally, the magnetic flux is concentrated on the axial surface of the measured axis. Sa14
As a torque detection method for detecting torque from T, for example, the one shown in 1C1K1IJI52-1/985, is known.

This horn θ is magnetostrictive 4A 1' on the shaft surface of the shaft to be measured.
A coating layer of il is formed by electroplating, melt immersion) (!i Metsu 1, gold 11 eight cure 1 method or vacuum steam q), and the magnetic flux from L1 il is transferred to the measured axis. Magnetism on the surface of the shaft: Avoid placing it in the bundle for 1 month.

However, in the 1 to 1 torque detection method configured in this way, 5'? , the structure is such that the coatings of 11 yen are laminated. The structure is such that the J, C-C coating (11%) layer is protected.

Therefore, if the detector is used for a long time in a situation where the temperature of the ring where the detector is used is large or the temperature of the measured shaft itself is large, the thermal film between the measured shaft and the coating will have a 1μ coefficient. The llq layer is peeled off from the off-axis surface to be measured due to the difference in n; 1
There is a problem with it being easy to fall.

In addition, when using the human situation T' (゛) where [. -1-＼ゝ)
(14111.11 The coating peels off after long-term use.)
)) It is said to be easy to fall! +11 +: ii increases cl.

In particular, when detecting the engine torque during automatic operation, the r: iA degree change and 1 herk fluctuation are 1 Mi and the human body is detected. It is extremely difficult to maintain a stable and high detection sensitivity between 1111 and 1111 times, depending on the amount of IJ.

(Objective of the Invention) The present invention is directed to the magnetostrictive structure formed in the 11tll position where the torque is 1111λ.
< , 1 Iil long (1, 1, 7, +j fluctuation and stable, the torque detector 1 to 1 to 11 (Q?) is provided by the output device.

(18th Form of the Invention) - In order to achieve the objective 1, the present invention (1, 14) forms one stage of high magnetic permeability 17ii' on the shaft surface of the measuring axis,
This high-speed (()k-rate thin film is moved to ~ part of the magnetic path) and high-speed 11! Mouth “t”? ,'1) A detector is placed near the high magnetic permeability film and further detects the magnetostrictive component of the magnetic flux passing through the high magnetic permeability film. Dedicated to the second film 119), the high magnetic permeability thin film 1) or the previous 1. [] The same ministry applies to the axis to be measured. It will be done.)
1. Niji's ''(゛(liruru.

(Explanation of Examples) Hereinafter, an example of the present invention! ! Examples using the attached drawings ('
i'T will explain in detail.

FIG. 1 shows an embodiment of the present invention at 1 to 1 to 1 lux detection station head.
This is a schematic cross-sectional view.

In the same figure, a magnetostrictive film 2 is formed on the shaft surface portion of the shaft 1 to be measured 4j made of steel or the like.

This magnetostrictive film 2 is made of, for example, an iron-based (Fe-8i-B) magnetic alloy, and is rapidly cooled to the outer periphery of a disk that rotates at high speed around the alloy body of (a). Approximately 10f
There is one that is formed by winding a 1m thin strip multiple times and has a high transparency (similar to salmon 10) and a large magnetostrictive effect.

A thin ribbon made of stainless steel is wound multiple times around the outer periphery of the magnetostrictive film 2 to provide a magnetization +t1 protection 1 that is thicker than the magnetostrictive film 2. 3 is formed -(there,.

As shown in FIG. 2, both ends of the non-magnetic protective film 3 are irradiated with, for example, an electron beam 4 or a Rayleigh beam.
1! J2 and the shaft to be measured 1 are made into a molten alloy (integrated).

Therefore, (6 strained film 2 is 3J l, -'(
After melting (15), the non-magnetic protective film 3 is coated and fixed with "ζ-)". 1. :, welded machine-'
The (absent) strained film portion remains in an amorphous state.

Figure 3 shows an experiment in which a metal alloy 5 of iron-based metal 1/1 with a thickness of approximately 25μ11 was sandwiched between iron plates 6 and 7. Here is an enlarged cross-sectional view of the result of lightning beam/IC welding.

When J is added to this, the center part of the weld bead part 8 is made of alpha magnetic + 11 alloy λ.
There is a C, but other parts of the L
It can be seen that the torque of the porcelain bamboo alloy is 1τ・d.

Returning to Figure 1), magnetization ('lTat 17i1 of the stabilizing film 3
C: L to 1, excitation = +il 9 and detection -]il 1
0 covers /i very densely 18, ka-) measured i11+
1 and 1 and C are arranged coaxially.

For excitation = 1 9113J, and detection 10, for example (: ``bar 71-1, etc.
4C 1-911 from j is spaced by uC U13 from the measured axis 1 at a minute interval.

Next, go to 1 placement ~ Ruku detection 1 [Explanation of fortune telling 1'1 C)'
<> ++ First, a high frequency with a predetermined amplitude J3 paralysis frequency (excitation upstream) flows into the coil 9, and magnetic flux is generated from the excitation coil 9. There is a magnetostrictive film 2 with a high magnetic permeability on the surface of the shaft 1 to be measured, and a magnetostrictive film 3 with a stainless steel film 3 is placed on the surface of the shaft 1. Therefore, as shown in Figure 4,
A magnetic circuit is formed via ↑film 2).

Here, the time (detected by a3 =) is inside coil 0.
rll) the magnetic flux φ(1),]]■out-1 il1
As the number of turns of
1).

Therefore, when a torsion torque of 1 to 1 is applied to the measured object 11'l111, an electric current is transmitted to the magnetostrictive film 2. changes (
), dφ(t)/di in equation (1) changes, the induced electromotive force "2" changes, and the detection output becomes 151.

Therefore, in the 1-lux detection equipment constructed from J5 to J5, the thin magnetostrictive film 2 made of an amorphous magnetic alloy wound around the shaft 1 to be measured is replaced by the non-magnetic protective film 3 J5. and is integrally welded to the shaft to be measured 1, and this magnetostrictive film 2
Since the magnetostrictive film 2 is restrained by the thicker non-magnetic protective film 3, the magnetostrictive film 2 peels off from the shaft 1 to be measured 1 or 11 due to temperature changes or 1 to 1 lux fluctuations. ;) It becomes difficult to fall. 1.Furthermore, ゛City-
j″-beam 4 W Q) Welding 11.’l heat minute/I
Since the constant 111111i force (111111i) is exerted on (the silicon film 2), the magnetostrictive film 2 melts and solidifies, 1.1.: ?, r Il
rg fiI contracts and expands (1192 inside)
1c) It21' A wrinkle between / l': I want a uniform and good j'bath' contact without q)) or l'l fiI
It's 3 degrees further and I'm coming! 74111 fixed 1111
1+ 1 is ♀ entered Steel I d Lee -) 6 11
1, ゛ ノ] 1 small, high frequency 1" excitation fli-, 1
When the irradiation is excited, the measured object 1llllll11
m VJ (It <, 1J, Jl i, i & 1!
I keep it! u II':;! +', 3 comes from the stainless steel C', the magnetic flux passes through the l pregnant gifj membrane 2, and l1i1. +Magnetic 1 (Magnetic 1 from Le 9
Energy is effective for detection 1 (101', '4!i + protrusion and protrusion. Because of this, high detection sensitivity can be obtained.)
] Light 11゛ Film 2 -) and non-magnetic protective film: 3 +'
= J, =) and is held down by the shaft 3 to be measured ().
The torque of the screw 1 screw 1 of the measured object 1h111 is transmitted to the magnetostrictive film 2 as a positive bit, and the detection output is j11.

By the way, the L We example is by, adhesive (ゝ)
When welding the above-mentioned amorphous alloy alloy to the shaft to be measured, the adhesive application rli tends to be uneven <-'r- output is stable and ff11<, torsion 1 ~ torque is applied. (1i111), peeling is likely to occur. In addition, the strength of the amorphous magnetic I11 alloy is low due to n'j < due to the critical cooling rate during its manufacturing process.
It is extremely difficult to weld the M1 band of Arolfus porcelain bamboo alloy to a thin body like the shaft 1 to be measured.

For example, in an experiment in which a 25 μm thick amorphous magnetic ↑1 alloy ribbon is placed on a 2 mm thick steel plate (D), the accelerating voltage is 1 (') OKV, 0.2 −・・0
．． The welding current of 32■Δ did not fully reach the large plate, and the welding current of ?8 was reduced to 0.
△When I tried to do this, the iron plate had a hole in it.
゛).

-1 step, encouragement) Run to Kushibi- 71'rtl! [After a while, the welding of the magnetic alloy medium thin strip was uniform and the welding was uniform.1. This is A [Rufno 7
The magnetic IIi alloy is extremely thin, and Sl ＼ゝ) 1
3 J, eel 1! 1 Because it contains special ingredients, expansion and contraction occur due to melting and solidification during welding, and wrinkles become visible.
-L, (This is thought to be due to the fact that the earthen magnetic field t11 and the metal-containing a-band q1 alone suppress these elements t(17,1ν).

On the other hand, even when the metal-containing ribbon of the present invention is used, the abrasion etc. are still good and the results are good.
It is possible to maintain a constant welding state by 1, and negative 1
°il'lt good.

j, repo, excitation 1 (le 9(, - peri')
dll number 1 (month < 1-1z, 20 mA high frequency current is passed).

ノ、・Right rotation i11mu1 ~ Luk output change 1hi R1! ,l
1: However, the result as shown in Figure 1 is It1.

In addition, the above-mentioned Example-x゛l;1. I, li Senmyo membrane 2
．． 1. It is possible to use horn L porcelain limited to bamboo alloy (not other porcelain, 1.1j).
Cit Riri, No 1) Ito I11 protective film: 3 (, 2,)
However, although it is not limited to stainless steel, the combination of these can reduce the concentration of magnetic flux on the film 2 by 1!' and increase the detection output by 1. (,,,) is possible, and the workability is good.

Furthermore, magnetostrictive film 2 J3. J: Magnetization
may be formed by other conventionally known /i methods, but only in the case where J: -> is arranged at the same time.

) 1, detection -] It is possible to use a conventionally known f-stage, for example, a Hall element, which detects the magnetic flux by applying it to the coil. The arrangement may be a cross-arrangement type.

(Effects of the Invention) As explained above, the 1-Lue detection device of the present invention (11th thin 11th strip of high permeability band wound around a 11tll constant axis) Fork 11 <, 85 degree change or 1-
It has good durability even against roux fluctuations, and outputs 117 with good viscosity.

Furthermore, the magnetic flux is passed through 6 through the outer periphery of the fixed axis 1111;
It's easy to concentrate on t"'AIII!, so it's easy to detect.
There are times when I can get louder and louder.

In particular, in the detection of automobile dirt, etc.
Since temperature changes and 1-Lou fluctuations are small, the torque detection device of the present invention is extremely suitable for A).

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing one embodiment of the lux detector Ft'j' of the present invention, and FIG. 2 shows the axis to be measured in FIG. Figures 52 and 3 correspond to Figure 1 and show the state of the welded parts. The cross-sectional view in Figure 4 shows the operation of the 1-luke saving setting in Figure 1? I cross section, ri)! Figure '5 (see figure '1) When the output of the 1-Lue detection device is shown in Figure 111 (b,). [Protection) 1 shi) 4...Electronic bee L 9...Exciting coil 10...(U) Tagawa Il 11...-1-ri 9, 1'1 Applicant 1-1ρ [Automobile] 2 , Ceremony, 1 Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] (1) A shaft to be measured; a thin film with high magnetic permeability formed on the surface of the shaft to be measured; An excitation device forming a circuit: A detector for detecting the magnetostrictive component of the magnetic flux passing through the high-rejection film; Magnetism 1jl accent 11 on magnetic Uji rise! , > is coated with the highly transparent r+li* thin film so as to be firmly attached to the shaft to be measured.
device, 3