JP2003097905A - Method and apparatus for testing surface treating - Google Patents

Method and apparatus for testing surface treating

Info

Publication number
JP2003097905A
JP2003097905A JP2001289533A JP2001289533A JP2003097905A JP 2003097905 A JP2003097905 A JP 2003097905A JP 2001289533 A JP2001289533 A JP 2001289533A JP 2001289533 A JP2001289533 A JP 2001289533A JP 2003097905 A JP2003097905 A JP 2003097905A
Authority
JP
Japan
Prior art keywords
clutch plate
clutch
surface treatment
surface
armature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001289533A
Other languages
Japanese (ja)
Inventor
Naoyuki Sakai
Akiyoshi Tashiro
明義 田代
直行 酒井
Original Assignee
Toyoda Mach Works Ltd
豊田工機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyoda Mach Works Ltd, 豊田工機株式会社 filed Critical Toyoda Mach Works Ltd
Priority to JP2001289533A priority Critical patent/JP2003097905A/en
Publication of JP2003097905A publication Critical patent/JP2003097905A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To solve the problem that the thickness of a film processed trough the surface treating can not be measured unless a clutch plate is destroyed, and so the thickness of the film processed in the surface treating is measured using the spot check, and there is such a risk that a desired torque property can not be obtained in the coupling torque test after the installation. SOLUTION: The method is provided with a control clutch 22 composed of an inner clutch plate 31 and an outer clutch plate 32, at least one of which is processed trough the surface treating, and tests the thickness of the surface treated layer of the clutch plate being used for an electromagnetic friction clutch which makes the inner clutch plate 31 and the outer clutch plate 32 of the control clutch 22 frictionally engage to each other using the magnetic force of attraction. In the method, the magnetic flux passing through the clutch plate is varied by changing the current flowing in an exciting coil 52, and then the induced electromotive force is detected by a detecting coil 53, and the thickness of the film formed on the clutch plate through the surface treating is measured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thickness of a surface treatment layer of a clutch plate suitable for use in a driving force transmission device for transmitting torque between a first rotating member and a second rotating member by an electromagnetic friction clutch. The present invention relates to a method and apparatus for inspecting.

[0002]

2. Description of the Related Art As a driving force transmission device for transmitting torque between two rotating members that are coaxial and capable of relative rotation, a main clutch disposed between two rotating members, an electromagnetic friction clutch, and an electromagnetic clutch. There is known one provided with a cam mechanism for converting a frictional engagement force of a friction clutch into a frictional engagement force with respect to the main clutch.

In this type of driving force transmitting device, the electromagnetic friction clutch is actuated to frictionally engage the main clutch to transmit torque between both rotary members.
For example, it is arranged between a drive shaft and a driven shaft that form a four-wheel drive vehicle and functions to transmit torque between these two shafts.

The electromagnetic friction clutch includes a control clutch consisting of a plurality of clutch plates, an electromagnet arranged on one side of the control clutch, and an armature arranged on the other side of the control clutch. A magnetic path is formed between the control clutch, the clutch plate and the armature by the energization of the armature, and the armature is attracted to the electromagnet side by the magnetic induction action, and this attraction force causes the armature to frictionally engage the control clutch, thereby The friction clutch operates.

One type of such an electromagnetic friction clutch is disclosed in, for example, Japanese Patent Laid-Open No. 7-71563. Each clutch plate of the control clutch that constitutes the electromagnetic friction clutch has a friction engagement surface formed in an uneven shape with a predetermined surface roughness, and the control clutch is formed by frictionally engaging the projections. It is designed to work. In this case, the oil for lubricating and cooling the electromagnetic friction clutch is retained in the concave portion of the friction engagement surface.

By the way, in the electromagnetic friction clutch, the uneven shape of the friction engagement surface of each clutch plate disappears and the friction engagement surface becomes a mirror surface after long-term use. If the frictional engagement surface has an uneven shape, the oil is retained in the recessed portion. However, if the frictional engagement surface is mirror-finished, an oil film of oil is likely to be formed between the frictional engagement surfaces. When the relative rotation between the plates is small, the oil film force of the oil existing between the clutch plates is larger than the friction engagement force, and the phenomenon that the transmission torque for the relative rotation of both clutch plates gradually decreases is observed.

Therefore, in the electromagnetic friction clutch used in this type of driving force transmission device, in order to prevent the friction engagement surface of the clutch plate from being mirror-finished and improve the torque transmission characteristic of the electromagnetic friction clutch. The surface of the clutch plate is surface-treated. Such a surface treatment has, for example, an oxide film, a nitrogen compound layer, and a nitrogen diffusion layer, and synergistically exhibits corrosion resistance, wear resistance, and fatigue resistance.

By the way, in the electromagnetic friction clutch in which the friction engagement surface of the clutch plate is subjected to the surface treatment as described above, the magnetic permeability changes due to the variation in the thickness of the surface treatment layer of the clutch plate, so that the surface treatment film. It was found that the variation in the thickness changes the attraction force characteristic with respect to the current value applied to the electromagnet, which causes a new problem that the torque characteristic with respect to the current value varies.

Therefore, conventionally, in order to control the surface-treated film thickness of the surface-treated clutch plate, the clutch plate is broken by a sampling inspection, the surface-treated film thickness is measured, and the quality thereof is determined. It was

[0010]

However, in the conventional method, the quality of the surface treatment film thickness cannot be judged unless the clutch plate is broken. Therefore, the inspection of the surface treatment film thickness is performed regularly or in lots. There is a problem that the surface treatment film thickness of the control clutch incorporated into the driving force transmission device cannot be accurately inspected only by the unit.

In order to solve this problem, the surface treatment film thickness may be controlled instead by inspecting the thickness of the clutch plate itself during the inspection for breaking the clutch plates performed in lot units. It is conceivable that the surface treatment film thickness varies subtly with the changes over time and the type of furnace used for surface treatment, so even if a clutch plate with a certain thickness is installed, the desired torque characteristics will not be obtained by the torque inspection after installation. There was a problem that I could not get.

It is an object of the present invention to provide a novel inspection method and apparatus capable of accurately measuring the surface treatment film thickness without breaking the clutch plate.

[0013]

In order to achieve the above object, the invention according to claim 1 is provided with a control clutch in which at least one of an inner clutch plate and an outer clutch plate is surface-treated. A method for inspecting the thickness of the surface treatment layer of the clutch plate used in the electromagnetic friction clutch in which the inner clutch plate and the outer clutch plate are frictionally engaged by the magnetic attraction force of the electromagnet, and A change is caused in the magnetic flux passing through the clutch plate, the change in induced electromotive force due to the change in the magnetic flux is detected, and the film thickness of the surface treatment applied to the clutch plate is measured. .

According to a second aspect of the present invention, a cylindrical main body portion having an abutting surface for abutting a clutch plate whose surface treatment film thickness is to be measured, and an abutting surface of the main body portion are abutted. An armature that faces the contact surface with a clutch plate sandwiched between the main body and the main body that is held by the main body and is excited.
It is characterized in that it is constituted by an exciting coil for generating a magnetic flux passing through the clutch plate and the armature, and a detecting coil for detecting an induced electromotive force which changes due to a change in the magnetic flux due to a change in the current excited in the exciting coil. .

According to a third aspect of the present invention, there is provided a clutch plate abutting against the abutting surface of the main body and a guide for positioning the armature in the radial direction. In the invention, the detection coil is provided on the outer circumference of the exciting coil or on the armature.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows the overall structure of a driving force transmission device equipped with an electromagnetic friction clutch incorporating a surface-treated clutch plate. Reference numeral 11 denotes a bottomed cylindrical front housing, and an opening of this front housing 11 is shown. A rear housing 12 is integrally screwed to the end. The front housing 11 and the rear housing 12 form a first rotating member. A shaft 13 constituting a second rotating member is arranged inside the front housing 11, one end of the shaft 13 is connected to the front housing 11 via a bearing 14, and the other end is connected to a rear housing via a bearing 15. 12 are rotatably supported. Although not shown, the front housing 11 is connected to a propeller shaft, and the shaft 13 is spline-engaged with a drive pinion shaft rotatably supported by a differential case. The rear housing 12 includes an inner cylinder portion 16, a ring-shaped shield portion 17 fixed to the outer periphery of the inner cylinder portion 16, and an outer cylinder portion 18 fixed to the outer periphery of the shield portion 17. The inner tubular portion 16 and the outer tubular portion 18 are made of a magnetic material such as iron, and the shielding portion 17 is made of a non-magnetic material. A main clutch 20, a cam mechanism 21, and a control clutch 22 are housed between the bottom of the front housing 11 and the end surface of the rear housing 12 between the outer circumference of the shaft 13 and the inner circumference of the front housing 11. ing.
The main clutch 20 includes a plurality of inner plates 23.
And an outer plate 24, and an inner plate 23
The inner periphery of the outer plate 24 is engaged with a spline portion formed on the outer periphery of the shaft 13 so as to be relatively movable only in the axial direction, and the outer periphery of the outer plate 24 is axially aligned with the spline portion formed on the inner periphery of the front housing 11. Is engaged so as to be relatively movable. The inner plate 23 and the outer plate 24 are alternately arranged in the axial direction, and one end of the outer plate 24 is in contact with the bottom portion of the front housing 11. A paper fiber is attached to the inner plate 23 of the main clutch 20 on the frictional engagement surface with the outer plate 24. The cam mechanism 21 includes a pair of first and second cam members 25 and 26 arranged between the main clutch 20 and the rear housing 12, and a ball 27 sandwiched between the cam members 25 and 26. It is composed by. The first cam member 25 is spline-engaged with a spline portion formed on the outer periphery of the shaft 13 so as to be relatively movable only in the axial direction, and the outer peripheral portion of the first cam member 25 is extended outward in the radial direction to move the main clutch 20 to the front side. A pressing portion 25A that presses toward the bottom of the housing 11 is formed. The second cam member 26 is supported on the end surface of the inner tubular portion 16 of the rear housing 12 so as to be relatively rotatable via a thrust bearing 28. V-shaped cam surfaces that are gently inclined in the circumferential direction are formed between the facing surfaces of the first and second cam members 25 and 26, and a ball 27 is sandwiched between these cam surfaces. . The ball 27 includes a pair of cam members 25,
By the relative rotation of 26, ride on the inclined cam surface,
As a result, the first and second cam members 25, 26 are relatively moved in a direction in which they are axially separated from each other.

The control clutch 22 includes a plurality of inner clutch plates 3 arranged alternately in the axial direction.
1 and the outer clutch plate 32, the inner circumference of the inner clutch plate 31 is splined to the outer circumference of the second cam member 26, and the outer circumference of the outer clutch plate 32 is splined to the inner circumference of the front housing. Have been combined. In the embodiment, as an example, the control clutch 22 is composed of a total of seven inner side clutch plates 31 and four outer side clutch plates 32.

One of the inner side clutch plate 31 and the outer side clutch plate 32 constituting the control clutch 22 is formed in a multi-layer structure having a base material made of iron as a basic structure, and the other is made of iron. Both of these clutch plates 3 are formed in a single-layer structure made of a base material.
The friction engagement surfaces 1 and 32 are formed to have a predetermined surface roughness.

For example, when the inner clutch plate 31 has a multi-layer structure, as an example, the nitrogen diffusion layer is formed on the surface side of the iron base material, the nitrogen compound layer is formed on the surface side of the nitrogen diffusion layer, and the nitrogen compound layer is formed on the surface side of the nitrogen diffusion layer. It is composed of a multi-layer structure having an oxide film on the surface side and synergistically exhibits corrosion resistance, wear resistance, and fatigue resistance, and prevents the friction engagement surface from becoming a mirror surface.

The control clutch 22 and the first
An armature 33 is arranged between the pressing portion 25A of the cam member 25 and the end surface of the rear housing 12 so as to sandwich the control clutch 22. The armature 33 is a spline formed on the inner circumference of the front housing 11. It is engaged with the part so as to be relatively movable only in the axial direction. On the other hand, on the side of the rear housing 12, an electromagnet 34 is arranged with slight air gaps G1 and G2 between it and the rear housing 12. This electromagnet 34
Is an annular core 35 made of a magnetic material, a coil 36 wound around the core 35, and the coil 3
6 and a lead wire 37 for supplying a current, the iron core 35 is held by a yoke 39 which is supported by the rear housing 12 via a bearing 38 so as to be relatively rotatable. Therefore, a predetermined current is supplied to the electromagnet 34 based on the signal from each wheel speed sensor or the like. The yoke 39 is prevented from rotating with respect to the fixed portion by an unillustrated rotation preventing mechanism, whereby the electromagnet 34 is always held stationary. The control clutch 22, the armature 33 and the electromagnet 34 described above constitute an electromagnetic friction clutch 40. An O-ring 41 is provided between the outer circumference of the rear housing 12 and the inner circumference of the front housing 11, and an X ring 42 is provided between the inner circumference of the rear housing 12 and the outer circumference of the shaft 13. . As a result, the rear housing 12 liquid-tightly closes the open end of the front housing 11, and liquid-tightly seals the clutch oil chamber 43 in which the main clutch 20, the cam mechanism 21, and the control clutch 22 are housed. . Clutch oil chamber 43
Clutch oil is contained in the main clutch 20 and the control clutch 22 to maintain good wear, disengagement, and judderability.

Next, the control clutch 22 described above.
A method of determining the quality of the processed film thickness of the inner clutch plate 31 will be described.

In FIGS. 2 and 3, reference numeral 50 denotes a film thickness measuring device, which is a cylindrical body 51.
And a clutch plate 31 at one end of the main body 51.
The contact surface 51 </ b> A that contacts with is formed. The film thickness measuring device 50 is used with the contact surface 51A facing upward. An exciting coil 52 is provided on the outer periphery of the main body 51,
The detection coil 53 is formed by winding, for example, an enameled wire around the outer circumference of the exciting coil 52. The exciting coil 52 is connected to the exciting power source 54, and the detecting coil 53 is connected to the voltage detector 55. An outer cylinder portion 56 is fixed to the outer periphery of the main body portion 51 by a screw member 57 so as to surround the exciting coil 52 and the detection coil 53.
A contact surface 56A which is loosely fitted in the contact surface 51A of the main body 51 in the radial direction is formed at one end of the contact surface 51A on the same plane as the contact surface 51A. A guide ring 58 fitted to the outer circumference of the clutch plate is provided on the outer circumference of one end of the outer tubular portion 56, and the main body portion 5 is provided on the inner circumference of the guide ring 58.
The armature 59 facing the contact surfaces 51A and 56A of the outer cylinder 1 and the outer cylinder 56 is detachably fitted.

A clutch plate 31 whose film thickness is to be measured is abutted on the contact surfaces 51A and 56A of the main body 51 and the outer cylinder 56 while being guided by a guide ring 58. An armature 59 is placed on the armature 59, and the armature 59 sandwiches the clutch plate 31 and contacts the contact surfaces 51A and 56A of the main body 51 and the outer cylinder 56.
It is arranged to face A.

With the above structure, when a predetermined current is applied to the exciting coil 52 from the exciting power source 54, the main body 51, the outer cylinder 56, the clutch plate 31, the armature 59, the main body, as shown by the arrows in FIG. A magnetic flux passing through the portion 51 is formed. When the current flowing through the exciting coil 52 is changed by a certain amount, the magnetic flux is changed, an induced electromotive force is generated in the detection coil 53, and a current flows, and the voltage detector 55 detects the voltage change at that time. Since the magnitude of the voltage at this time depends on the magnetic permeability of the clutch plate 31, the film thickness of the surface treatment applied to the clutch plate 31 can be measured by the voltage level.

Then, it is possible to determine whether the film thickness of the surface treatment is within the allowable range or deviates from the allowable range from the change in the voltage detected by the voltage detector 55. As a result, the control clutch 22 is sent to the assembly process.

According to the above-described embodiment, the quality of the surface-treated film applied to the clutch plates 31 can be determined without breaking the clutch plates, so that it is possible to check the total number of clutch plates 31. It becomes possible to prevent the situation where desired torque characteristics cannot be obtained by the coupling torque inspection after assembly. Next, the operation of the driving force transmission device incorporating the clutch plate whose surface-treated film thickness is measured as described above will be described.
When no current is supplied to the electromagnet 34,
Since the control clutch 22 and the main clutch 20 are released, the propeller shaft (not shown)
The torque transmitted to the rotating member (front housing 11 and rear housing 12) is not transmitted to the second rotating member (shaft 13). When current is supplied to the electromagnet 34, magnetic flux passes through the air gap G1, the inner tubular portion 16 of the rear housing 12, the armature 33, the outer tubular portion 18 of the rear housing 12 and the air gap G2 from the iron core 35, and the magnetic circuit is formed. The armature 33 is formed and moved toward the control clutch 22 by the electromagnetic force, that is, the magnetic attraction force. As a result, the control clutch 22 is pressed against the end surface of the rear housing 12 with a pressing force according to the magnetic attraction force, and the inner side and outer side clutch plates 31 and 32 are frictionally engaged. As a result, the torque transmitted to the front housing 11 is transmitted to the second cam member 26 of the cam mechanism 21 via the control clutch 22. When the torque from the front housing 11 side is transmitted to the second cam member 26, relative rotation is generated between the first cam member 25 connected to the shaft 13 and the ball 27 causes the first and second cams to move. Riding on the cam surface of the member. As a result, the first cam member 26
A thrust force in the direction of the main clutch 20 is generated in the cam member 25, the thrust force causes the main clutch 20 to be pressed by the pressing portion 25A, and the main clutch 20 is frictionally engaged. Due to the frictional engagement of the main clutch 20, the torque of the front housing 13 is transmitted to the shaft 13. That is, when the control clutch 22 is engaged by the magnetic attraction force, the thrust force amplified by the cam mechanism 21 is generated, and the main clutch 20 is engaged by this thrust force. Due to the engagement of the main clutch 20, the torque of the front housing 13 is transmitted to the shaft 13. As a result, the torque on the front wheel side transmitted to the propeller shaft (not shown) passes through the first rotating member 13, the second rotating member 14, and the drive pinion shaft supported by the rear differential case (not shown) to the rear wheel side. And four-wheel drive is achieved.

At this time, since the surface treatment film thickness of the clutch plate 31 of the control clutch 22 can be uniformly controlled, the control clutch 22 can be frictionally engaged with the magnetic attraction force according to the current applied to the electromagnet 34, and the torque against the current can be applied. The transfer characteristics can be controlled with high accuracy.

The coupling torque tolerance itself can be made small by combining those having different processed film thicknesses. For example, the clutch plate 31 is divided into four ranks according to the measured processed film thickness. That is, if the film thickness is within the allowable value range, it is determined as “non-defective”, and if the film thickness deviates from the allowable value by a certain range in the positive direction, it is determined as “+ NG”, and the film thickness is similarly allowable Those that deviate from the value in the negative direction by a certain range are determined as "-NG". Further, those whose film thickness deviates in the positive direction from the range of "+ NG" and those which deviate from the range of "-NG" in the negative direction are determined as "defective products" and eliminated.

Then, by combining the two clutch plates 31 determined to be "+ NG" and "-NG", the two clutch plates 31 determined to be "good".
It is also possible to obtain the same result as when combining.

For example, as described above, there are three inner side clutch plates 31 (outer side clutch plate 3).
In the case of the control clutch 22 composed of 2), the control clutch 22 can be configured by using all three "good" clutch plates, as well as "good", "+ NG", and "-NG". The control clutch 22 can be configured by using the three clutch plates 31 described above. FIG. 4 shows another embodiment of the present invention, and this embodiment includes two different points from the above-described embodiment.

One is that the film thickness measuring device is constructed by utilizing the components of the driving force transmitting device described above, and the other is that the control clutch 22 unit consisting of seven clutch plates 31 and 32 is used. The quality of the film thickness is determined by.

That is, the film thickness measuring device has a housing 61 composed of the rear housing 12, and an outer guide ring 62 is screwed to the outer periphery of the housing 61. The outer guide ring 62 is formed by cutting the front housing 11 at the central portion in the axial direction.
Splines are formed on the inner circumference of the outer clutch plate 32 of the control clutch 22 and the outer circumference of the armature 63.

An excitation coil 64 is held in the housing 61, and a detection coil 65 formed by winding an enameled wire or the like is provided on the outer circumference of the excitation coil 64. The exciting coil 64 is connected to an exciting power source (not shown),
The detection coil 65 is connected to a voltage detector (not shown).

An inner member 66 using the shaft 13 is fitted in the center of the housing 61, and the inner guide ring 6 using the second cam member 26 in the inner member 66.
7 is attached, and a spline that engages with the inner clutch plate 31 is formed on the outer periphery of the inner guide ring 67.

In the above-mentioned structure, the same parts as those used in the driving force transmission device shown in FIG. 1 are used in the same assembled state except for the outer guide ring 62 and the detection coil 65. On the other hand, the control clutch 2
Since No. 2 is composed of 7 clutch plates in total, even if the film thickness inspection of each clutch plate results in NG, by combining them, the coupling torque can be kept within the design tolerance. Because it will be possible
Seven plates to be incorporated in an actual coupling device are arranged between the housing 61 and the armature 63 to inspect as one set of seven plates.

According to this embodiment, it is possible to judge whether each control clutch 22 is defective or not without causing a variation in the surface treatment film thickness of each clutch plate.

In the above-described embodiment, an example in which the detection coil 53 is formed by winding an enameled wire or the like on the outer circumference of the excitation coil 52 has been described. However, the detection coil 53 may be any armature 59 or the like through which magnetic flux passes. It may be provided at a position.

Further, in the above-described embodiment, an example in which only the inner clutch plate of the control clutch is subjected to the surface treatment has been described, but the outer clutch plate is also subjected to the surface treatment. It is applicable, and also in this case, it is possible to inspect the clutch plate alone or the control clutch unit.

[0039]

As described above, according to the present invention,
The film thickness of surface treatment should be measured.Since the film thickness can be measured by detecting the induced electromotive force generated by the change in magnetic flux passing through the clutch plate, the film thickness of surface treatment can be measured without breaking the clutch plate. You will be able to measure. Therefore, it is possible to measure the surface treatment film thickness of all clutch plates, and it is possible to prevent the situation where desired torque characteristics cannot be obtained in the coupling torque inspection after assembly.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an overall configuration of a driving force transmission device including an electromagnetic friction clutch.

FIG. 2 is a sectional view of a surface treatment inspection apparatus showing an embodiment of the present invention.

FIG. 3 is an enlarged view of a main part of FIG.

FIG. 4 is a sectional view showing another embodiment of the present invention.

[Explanation of symbols]

11 Front housing 12 Rear housing 13 First rotating member 14 Second rotating member 15 shaft 20 Main clutch 21 Cam mechanism 22 Control clutch 31, 32 Clutch plate 33 Armature 34 Electromagnet 50 Film thickness measuring device 51 body 52 Excitation coil 53 Detection coil 54 Excitation power supply 55 Voltage detector 56 Outer cylinder 59 Armature

Continued front page    F term (reference) 2F063 AA16 BB02 CA13 DA05 DC08                       GA01 KA01                 2G017 AA01 AD03 AD04                 2G053 AA24 AB01 AB07 BA19 BC03                       BC14 CA03

Claims (4)

[Claims]
1. An electromagnetic clutch comprising a control clutch, wherein at least one of the inner clutch plate and the outer clutch plate is surface-treated, and the inner clutch plate and the outer clutch plate of the control clutch are frictionally engaged by a magnetic attraction force of an electromagnet. As a method for inspecting the thickness of the surface treatment layer of the clutch plate used for the friction clutch, the magnetic flux passing through the clutch plate is changed by the change of the current flowing through the exciting coil, and the induced electromotive force is changed by the change of the magnetic flux. A surface treatment inspection method characterized by detecting a change and measuring a film thickness of the surface treatment applied to the clutch plate.
2. A cylindrical main body having an abutting surface for abutting a clutch plate whose surface treatment film thickness is to be measured, and a clutch plate abutting on the abutting surface of the main body for sandwiching the clutch plate. An armature facing the contact surface, an exciting coil that is held by the main body and generates a magnetic flux that passes through the main body, the clutch plate, and the armature by excitation, and is changed by a change in the magnetic flux due to a change in the current excited in the exciting coil. A surface treatment inspection apparatus comprising a detection coil for detecting an induced electromotive force.
3. The surface treatment inspection apparatus according to claim 2, further comprising a clutch plate that abuts on an abutting surface of the main body and a guide that positions the armature in a radial direction.
4. The surface treatment inspection apparatus according to claim 2 or 3, wherein the detection coil is provided on an outer periphery of an exciting coil or an armature.
JP2001289533A 2001-09-21 2001-09-21 Method and apparatus for testing surface treating Pending JP2003097905A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001289533A JP2003097905A (en) 2001-09-21 2001-09-21 Method and apparatus for testing surface treating

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001289533A JP2003097905A (en) 2001-09-21 2001-09-21 Method and apparatus for testing surface treating

Publications (1)

Publication Number Publication Date
JP2003097905A true JP2003097905A (en) 2003-04-03

Family

ID=19112007

Family Applications (1)

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JP2001289533A Pending JP2003097905A (en) 2001-09-21 2001-09-21 Method and apparatus for testing surface treating

Country Status (1)

Country Link
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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS502576A (en) * 1973-05-04 1975-01-11
JPS57144059A (en) * 1981-03-02 1982-09-06 Sumitomo Heavy Ind Ltd Measuring device for thickness of paint film
JPS61244927A (en) * 1985-04-19 1986-10-31 Fujitsu Ltd Clutch wear amount display device
JPS6365309A (en) * 1986-09-08 1988-03-23 Toyota Autom Loom Works Ltd Warning method for life of clutch plate
JPS6371441A (en) * 1986-09-12 1988-03-31 Diesel Kiki Co Ltd Clutch control device
JPH0932867A (en) * 1995-07-17 1997-02-04 Isuzu Motors Ltd Clutch adjusting alarm device
JPH11303910A (en) * 1998-04-15 1999-11-02 Kawasaki Heavy Ind Ltd Abrasion detecting device for friction disk
JP2001153776A (en) * 1999-11-30 2001-06-08 Komatsu Ltd Measuring apparatus for abrasion amount of lining

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS502576A (en) * 1973-05-04 1975-01-11
JPS57144059A (en) * 1981-03-02 1982-09-06 Sumitomo Heavy Ind Ltd Measuring device for thickness of paint film
JPS61244927A (en) * 1985-04-19 1986-10-31 Fujitsu Ltd Clutch wear amount display device
JPS6365309A (en) * 1986-09-08 1988-03-23 Toyota Autom Loom Works Ltd Warning method for life of clutch plate
JPS6371441A (en) * 1986-09-12 1988-03-31 Diesel Kiki Co Ltd Clutch control device
JPH0932867A (en) * 1995-07-17 1997-02-04 Isuzu Motors Ltd Clutch adjusting alarm device
JPH11303910A (en) * 1998-04-15 1999-11-02 Kawasaki Heavy Ind Ltd Abrasion detecting device for friction disk
JP2001153776A (en) * 1999-11-30 2001-06-08 Komatsu Ltd Measuring apparatus for abrasion amount of lining

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