JPH04120409A - Detecting apparatus for groove of component such as cam shaft - Google Patents

Abstract

PURPOSE:To eliminate influence of environments at the time of measurement by making decision by means comparison of signal values indicating distances between a sensor and an object to be detected and between a model sensor and a model component which are measured by the sensor and the model sensor with a reference value. CONSTITUTION:When whether or not a groove of an object 21 to be detected exists is to be detected, an electric signal such as voltage transmitted from an oscillator 9 is input via amplifiers 8a, 8b to an eddy current sensor 2a and a mode sensor 2b. Then an electric signal proportional to a distance 3a between the sensor 2a and a groove forming part 22a of the object 21 and a signal proportional to a distance 3b between the sensor 2b and a model portion 22b of a model component 21b are output, and the respective outputs are input to a differential amplifier unit 5. Then a difference in electric signals output from the amplifier unit 5 is input to a comparator 6 of a determining unit 4. In the comparator 6, a reference value for deciding a groove which is input from a reference setting device 7 and the value input from the amplifier 5 are compared with each other, deciding existence of the groove 1.

Description

Detailed Description of the Invention =Object of the Invention= [Industrial Application Field] The present invention is directed to groove detection, which uses a sensor to detect the presence or absence of a groove in a detected object, for example, a component such as a camshaft. It is related to the device.

[Conventional technology]

Conventionally, as shown in FIG. 5, a device for detecting whether or not there is a groove in a corresponding part of an object to be detected uses a sensor 302 at a groove forming part 322a, which is a position in an object 321 where a groove can be formed. There is something that is opposed to. In such a device 301, the distance 303 between the sensor 302 and the detected object 321 is measured by the sensor 302, and the value is
It is sent to a comparison unit 306, which is part of the determination unit 304 and has a reference value set in advance. The presence or absence of a groove is then determined by comparing it with the reference value.

[Problem to be solved by the invention]

In the conventional groove detection device 301 described above, the sensor 30
Since the distance 303 between 2 and the detected object 321 is measured as an absolute value, unfavorable environments at the time of measurement, such as cutting water remaining in the detected location 7 or changes in temperature and humidity, may cause inaccurate measurement results. This may lead to incorrect judgment results.

Therefore, it has been an issue to provide a device for detecting grooves in a component such as a camshaft that is not affected by the environment during measurement.

=Structure of the invention= [Means for solving the problem] A sensor facing a groove forming part, which is a position where a groove can be formed in a detected object, and a sensor facing a groove forming part, which is a position where a groove can be formed in a detected object, and A model sensor facing the model part of a model part having a model part having the same diameter as either the outer diameter or the outer diameter when no groove is formed, and the model sensor and the model sensor. The distance between the sensor and the detected object and the distance between the model sensor and the model part are input as signals, and a reference value for determining the presence or absence of a groove is set, and the signal value is compared with the reference value. and a determination unit that determines the presence or absence of a groove.

[Examples and effects]

The configuration of an embodiment of the present invention will be explained below based on the drawings.

FIG. 1 shows a groove detection device 1 for a component such as a camshaft (hereinafter referred to as groove detection device), an object to be detected 21, and a model component 21b according to a first embodiment of the present invention.

This groove detection device 1 includes two eddy current sensors as electromagnetic induction sensors. Of the two eddy current sensors, one eddy current sensor 2a detects a groove 22 formed in a groove forming portion 22a, which is a position where a groove of the detected object 21 can be formed.
is facing. The groove forming portion 22a of the object to be detected 21 has a
There are cases where grooves 22 are formed as shown in FIG. 1, and cases where no grooves are formed (not shown). In addition, the model sensor 2b, which is the other eddy current sensor, is a model part 22b shown by a two-dot chain line of the model part 21b.
is facing. This model part 21b has the same shape as the above-mentioned detected object 21, and is a comparison object for determining the presence or absence of a groove in the detected object 21, so the outer diameter of the model part 22b is particularly The outer diameter is set to the case where no groove is formed in the groove forming portion 22a of the detection object 21.

The connection state between these eddy current sensor 2a and model sensor 2b and other members is as follows.

The oscillator 9, which is an electric signal transmission source, is connected to two amplifiers 8a.
, 8b, and from these two amplifiers 8a, 8b respectively the aforementioned eddy current sensor 2a.

It is connected to the model sensor 2b. Further, the eddy current sensor 2a and the model sensor 2b are connected to one differential amplification section 5. This differential amplifier section 5 is connected to the comparator of the determination section 4.

The determination section 4 is composed of this comparator 6 and a reference value setter 7. A reference value setter 7 is connected to the comparator 6 for inputting a reference value to the comparator 6 for determining the presence or absence of a groove. The comparator 6 and the reference value setter 7 can be realized by hardware or software.

Next, a groove detection method using the above-mentioned groove detection device 1 will be explained.

When detecting the presence or absence of a groove in the object to be detected 21, an electric signal such as current or voltage is transmitted from the oscillator 9 and input to the two amplifiers 8a and 8b. Amplifier 8a.

From 8b, the amplified electric signal is sent to the eddy current sensor 2a,
Each is input to the model sensor 2b. Then, the eddy current sensor 2a outputs an electric signal proportional to the distance 3a between the eddy current sensor 2a and the groove forming portion 2' 2a of the detected object 21, and inputs it to the differential amplification section 5. At the same time, the model sensor 2b outputs an electric signal proportional to the distance 3b between the model sensor 2b and the model part 22b of the model component 21b, and this is also input to the differential amplifier 5 in the same way.

Then, the difference between these electrical signals output from the differential amplifier section 5 is input to the comparator 6 of the determination section 4.

Since the reference value for determining the presence or absence of a groove is inputted to the comparator 6 from the reference value setting device 7, the comparator 6 determines the presence or absence of a groove.

As shown in Figure 4, the reference values here refer to the upper and lower limits of the range of output voltage, etc. that is determined to be grooved, and the upper and lower limits of the range of output voltage, etc., that is determined to be grooved. That's true. These values may be determined in advance through experiments.

In this embodiment, the model part 22 of the model part 21b is
Since the outer diameter of b is the same as the outer diameter when no groove is formed in the groove forming portion 22a of the object to be detected 21, if the difference in the electrical signals output from the differential amplification section 5 is significant, Detected object 2
It is determined that the first groove forming portion 22a has a groove as shown in FIG. 1, and conversely, if there is no difference in the electrical signals described above, or even if there is a difference, it is determined that there is no groove.

In this way, the presence or absence of a groove on the detected object 21 can be determined based on the distance 3 between the eddy current sensor 2a and the groove forming portion 22a of the detected object 21.
Since this is done based on the difference in distance 3b between the model sensor 2b and the model part 22b of the model part 21b, even in a bad environment where cutting water or the like remains in the detection area,
Groove forming portion 22a in detected object 21 and model component 21
Since the environment is the same as that of the model section 22b of section b, there is no adverse effect on the determination results. Furthermore, even if there is a change in the environment such as temperature or humidity, since the eddy current sensor 2a and the model sensor 2b are placed in the same environment, the determination result will not be affected.

In the groove detection device according to the first embodiment of the present invention, the sensor is an eddy current sensor and the signal is electric, but the sensor and the signal may be of other types as described below.

In the groove detection device 101 according to the second embodiment of the present invention, as shown in FIG. 2, the sensor is an air sensor.

This groove detection device 101 is equipped with two air sensors. Among the air sensors 102a and 102b, one air sensor 102a faces a groove forming portion 122a, which is a position where a groove of the detected object 121 can be formed.

As shown by the two-dot chain line in the figure, no groove is formed in the groove forming portion 122a of the detected object 121. Furthermore, the model sensor 102b, which is the other air sensor among the air sensors 102a and 102b, is connected to the model component 121b.
It faces the model portion 122b indicated by the two-dot chain line.

This model part 121b has the same shape as the above-mentioned object to be detected 121, and is a comparison object for determining the presence or absence of grooves in the object to be detected 121. In particular, the outer diameter of the model part 122b is The outer diameter is set to the case where no groove is formed in the groove forming portion 122a of the detection object 121.

These air sensor 102a and model sensor 102
b is connected to the determination unit 104 via the differential amplification unit 105, which is the same as in the groove detection device according to the first embodiment, so a description thereof will be omitted. A differential pressure gauge may be used instead of the differential amplification section 105. When using a differential pressure gauge, the pressure difference between the two is measured by the differential pressure gauge.
No pneumatic converter required.

On the other hand, air is supplied to the air sensor 102a and the model sensor 102b from one air source 109 via pressure regulating valves 108a and 108b, respectively. In addition, the air sensor 102a, the model sensor 102b and the differential amplification section 10
Pneumatic converters 110a and 110b are installed between the two terminals 5 and 5, respectively.

Therefore, in this case, the comparison with the reference value in the determination unit 104 is performed as an electrical signal.

The nozzle diameter, outer diameter, etc. of the aforementioned air sensor 102a and model sensor 102b are set similarly to a normal air micrometer.

Next, a groove detection method using the groove detection device 101 described above will be described.

When detecting the presence or absence of a groove in the object to be detected 121, an air sensor 102 is sent from an air source 109 such as a compressor.
Air is supplied to the model sensor 102b. Air source 109
and a pressure regulating valve 108a provided between each air sensor 102a, 102b.

Each air pressure is adjusted by 108b. Air sensor 1
02 a r The air supplied to the model sensor 102b is ejected from its tip (112a
, 112b). Then, the air sensor 102a,
The pressures at the two locations described above sensed by the model sensor 102b are input to the differential amplifier 105 as electrical signals via the pneumatic transducers 110a and 110b, and the difference between them, that is, the groove according to the first embodiment. Detector! [
Similarly, air sensor 102 a r model sensor 102
By comparing the difference between electrical signals proportional to the distances 103a and 103b from b with a reference value in the comparator 106,
The presence or absence of a groove is determined.

In this embodiment, the model part 1 of the model part 121b is
Since the outer diameter of 22b is the same as the outer diameter when no groove is formed in the groove forming portion 122a of the detected object 121, there is no difference in the electrical signals output from the differential amplification section 105. If the difference in the electrical signals is very small, it is determined that there is no groove in the groove forming portion 122a of the object 121, as shown in FIG. .

In this way, the presence or absence of a groove on the detected object is determined based on the distance 103a between the air sensor 102a and the groove forming portion 122a of the detected object 121, and the distance 103a between the model sensor 102b and the model part 12.
Since the distance 103b from the model part 122b of the object 1b is measured, the groove forming part of the object 121 can be detected even under adverse effects such as residual cutting water or the like in the detection area or changes in temperature and humidity. 122a and model parts 121b
Since both the model part 122b and the model part 122b have the same environment, there is no adverse effect on the determination result. Moreover, since air is supplied at the same pressure from the same air source 109, the measurement conditions at the two locations described above are equal, and stable determination results can be obtained.

Note that the outer diameter of the model portion of the model component may be set to be the same diameter as the outer diameter of a groove formed in the groove forming portion of the object to be detected (not shown). In this case, if the difference between the electrical signals output from the differential amplifier section is significant, it is determined that there is no groove, and if there is no or very small difference, it is determined that there is a groove.

Using the groove detection device 1 (101) as described above, the third
As shown in the figure, the presence or absence of grooves in an actual mechanical part is detected, and the model of the part can be identified based on the result. As shown in FIG. 3, reference numeral 91 is a camshaft as an object to be detected, with grooves formed on the outer circumferential surface of the journal at various places. Journal 41.51 of this camshaft 91,
Out of 61°71, groove forming part 42a of 41,51.71
.

Grooves 42, 52, and 72 are formed in 52a and 72a, and no groove is formed in the groove forming portion 62a of the journal 61 shown by diagonal lines. and four sensors 42A, 52
A, 62A, and 72A each face the journal.

In FIG. 3, 91b is a model component having the same shape as the camshaft 91 described above. In the figure, as shown by two-dot chain lines, journals 41b, 51b, 61 of this model part 91b
b, 71b, each model part 42b, 52b, 62b, 72
b, model sensors 42B, 52B, 62B, 72B
are facing each other. The outer diameter of each model portion corresponds to the groove forming portion 42a of the camshaft 91, which is the object to be detected.

The outer diameters are set to be the same as the outer diameters when no grooves are formed in 52a, 62a, and 72a.

When detecting grooves, sensors 42A, 52A, 62
A, 72A measures the distances between the groove forming portions 42a, 52a, 62a, 72a of each journal of the detected object 91 and each sensor, and the model sensors 42B, 52B, 62
Each model part 42b of the model part 91b by B, 72B
, 52b, 62b, 72b and each model sensor. And the distance between each sensor and the groove forming part,
By comparing the difference between the distance between each model sensor and the model part with a reference value in the determination section, it is determined whether or not there is a groove in each journal of the object to be detected. That is, it is determined that the journal 41, 51, 72 has a groove, and the journal 61 does not have a groove. As a result, it is possible to identify that this camshaft 91 is a specific model.

Note that the groove detection device according to the present invention can be used to detect grooves not only in camshafts but also in other parts.

=Effects= As described above, according to the present invention, in a device for detecting grooves in a component such as a camshaft, a sensor facing a groove forming part, which is a position where a groove can be formed in an object to be detected, and Facing the model part of a model part having a model part having the same diameter as either the outer diameter when a groove is formed in the groove forming part of the object or the outer diameter when a groove is not formed. The model sensor, the distance between the sensor and the object measured by the model sensor, and the distance between the model sensor and the model part are input as signals, and a reference value for determining the presence or absence of a groove is set. The sensor is equipped with a determination unit that compares a reference value and a signal value to determine the presence or absence of a groove, and is equipped with a determination unit that determines the presence or absence of a groove by comparing the reference value and the signal value, and determines the distance between the sensor and the groove forming part of the object to be detected, and the distance between the model sensor and the model part of the model part. Since the presence or absence of grooves on the detected object is determined based on the difference in distance, the detected object can be detected even in adverse environments such as when cutting water remains in the detected area or there are changes in temperature, humidity, etc. Since the groove forming part and the model part of the model part are in the same environment, the determination result will not be adversely affected.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a groove detection device for a component such as a camshaft, an object to be detected, and a model component according to a first embodiment of the present invention, and FIG. 2 is an explanatory diagram of a second embodiment of the present invention. FIG. 3 is an explanatory diagram of a device for detecting grooves in a component such as a camshaft, an object to be detected, and a model component according to an example. FIG. 4 is an explanatory diagram showing a state in which detection is being performed, and FIG.
The figure is an explanatory diagram of a conventional groove detection device and an object to be detected. (Explanation of symbols) 2a...Sensor. 2b--Model sensor. 3a, 3b... Distance. 4... Judgment section. 21... Object to be detected. 21b...Model parts. 22a...Groove forming part. 22b...Model section.

Claims (1)

[Claims] A sensor 2a facing a groove forming portion 22a, which is a position where a groove can be formed in the detected object 21, and the detected object 21.
The model part 22b of the model part 21b has the same diameter as either the outer diameter when a groove is formed in the groove forming part 22a of the model part 21b or the outer diameter when a groove is not formed. The distance between the sensor 2a and the detected object 21 and the distances 3a and 3b between the model sensor 2b and the model part 21b measured by the model sensor 2b and the model sensor 2b are signals. and a reference value for determining the presence or absence of a groove is set, and a determination unit 4 that compares the reference value with the value of the signal to determine the presence or absence of a groove. A groove detection device for parts such as camshafts.