JPH0733127Y2 - Piston ring light leak inspection machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a light leakage inspection machine for piston rings such as internal combustion engines, reciprocating compressors, hydraulic cylinders and the like.

[Conventional technology]

Light leakage inspection is performed to inspect the sealing performance of piston rings used in internal combustion engines, reciprocating compressors, hydraulic cylinders, etc., that is, compression rings and oil control rings.

This is to check for light leakage from the contact area between the ring outer peripheral surface and the gauge inner peripheral surface when the piston ring is inserted into a ring gauge having the same inner diameter as the nominal diameter of the ring and light is applied from the back surface. It is a thing.

This inspection is rarely carried out in Japan except in special cases, but in foreign countries, the light leakage test is often conducted strictly as an important substitute characteristic that affects the performance of the piston ring.

According to JIS B8032, regarding light leakage inspection of piston rings,
Although it is easily touched, light leakage inspection equipment, inspection environment,
The inspection method is not specified specifically. In light of these circumstances, it is the actual situation that the piston ring manufacturer is in charge of the leak detection method for piston rings.

The conventional light leakage inspection machine consists of a dark box with a slit hole and a built-in light source, and a ring gauge, and the inspector conducted the inspection in a dark room or a dark curtain because it was necessary to observe weak light leakage. .

FIGS. 6 to 7 show a conventional light leakage inspection machine. The light leakage inspection machine 1a includes a dark box 3 and a light source fixed inside the dark box 3.
20 and a ring gauge 2 having the same inner diameter as the nominal diameter of the piston ring 10 to be inspected. One surface of the dark box 3 is a surface plate surface 12 having a substantially crescent-shaped slit hole 11 (see FIG. 4).

The light leakage inspection will be described below. The piston ring 10 to be inspected is fitted into the inner circumference of the ring gauge 2 and set on the surface plate surface 12 of the dark box 3. At this time, the ring gauge receiver 13 on the surface plate surface 12 is adjusted and the ring gauge 2 is set so that the contact portion between the inner peripheral surface of the ring gauge 2 and the outer peripheral surface of the piston ring 10 overlaps the slit hole 11. . Then, as shown in FIG. 7, the inspector determines the position of the eyes as the light source 20 and the slit hole.
11, the outer peripheral surface of the piston ring 10 and the ring gauge 2
Place it on the extension of the contact part with the inner peripheral surface of the, and rotate the ring gauge 2 360 degrees on the surface plate 12 while
By visually observing the portion 1, the presence or absence of light leakage and the light leakage angle (light leakage angle means the central angle formed by the line connecting both ends of continuous light leakage and the center of the ring gauge 2) are measured.

[Problems to be solved by the device]

As mentioned above, the light leakage inspection machine that has been used conventionally
In 1a, the inspector had to inspect in a dark room because it was necessary to observe faint light with the naked eye. Therefore, there are restrictions on the layout of the inspection site and the space of the inspection site. Further, since the inspector enters the dark room, workability is poor, and it is difficult to supervise reliability and productivity.

In addition, adjustment of the illuminance in the dark room is a problem, if it is too bright it becomes difficult to observe weak light leakage, on the other hand if it is too dark it is not possible to know the position of the slit hole 11, resulting in improper eye position or visual position. Error was easy to occur.

In addition, the conventional light leakage inspection directly observes the light leakage from the contact portion between the piston ring 10 and the ring gauge 2. Therefore, it is difficult to inspect for light leakage of a short circumference and intermittent weak light leakage.

2. It is difficult to measure the leak angle and leak perimeter.

For measuring the leak angle or leak perimeter, the method of marking and reading the ring is performed, but the workability is poor.

3. It is difficult to accurately record the width and extent of light leakage, only by recording the length of light leakage.

4. It is difficult to save the light leakage status.

Repeated inspection of the same piston ring for intermittent light leakage results in light leakage attenuation or change.

There was such a problem.

In addition, because multiple inspectors cannot observe the same ring at the same time, it is difficult to teach the criteria and make a pass / fail match.
There was also a problem that the inspector's subjectivity tended to be included.

The above defects of the conventional light leakage inspection machine 1a, the problem of the inspection method is due to direct observation of light leakage with the naked eye,
There are two types, one that occurs with the use of the darkroom.

An object of the present invention is to make it possible to accurately and efficiently measure the magnitude of light leakage by indirectly observing light leakage at the contact portion between the inner peripheral surface of the ring gauge and the outer peripheral surface of the piston ring.

[Means for Solving the Problems]

The light leakage inspection machine of the present invention comprises a dark box in which a slit hole is formed, a ring gauge mounted on the slit hole forming surface of the dark box, and a piston ring fitted to the inner circumference of the ring gauge. A video camera installed inside the dark box for photographing light leakage at a contact portion between the outer peripheral surface and the inner peripheral surface of the ring gauge through the slit hole, and a second for measuring the magnitude of the light leakage. And a means for synthesizing and displaying the second video and the leaked video captured by the video camera on the screen of the monitor display.

[Action]

The light leaked from the contact part between the outer peripheral surface of the piston ring fitted to the inner circumference of the ring gauge and the inner peripheral surface of the ring gauge is passed through a slit hole provided in the dark box, and is installed inside the dark box. The leaked light image taken by the camera and the second image of the leaked light angle scale or the leaked light circumference scale for measuring the size of the leaked light are combined and displayed on the screen of the monitor display, and the size of the leaked light is displayed. By indirectly observing, it is not necessary to inspect in a dark room, and a plurality of inspectors can observe the same leak light at the same time. As a result, the efficiency of light leakage measurement and the accuracy of light leakage measurement can be improved.

[Embodiment 1] FIG. 1 shows the configuration of a light leakage inspection machine.

In FIG. 1, the light leakage inspection device 1 includes a ring gauge 2 and
Dark box 3, two video cameras 4,5, stand 6,
It is composed of a title developer 7, a video recorder 8 and a monitor display 9.

The ring gauge 2 has the same inner diameter dimension as the nominal diameter of the piston ring 10 to be inspected.

The dark box 3 has a surface plate surface 12 having a substantially crescent-shaped slit hole 11 (see FIGS. 3 to 4).
Ring gauge 2 is set to 12.

The first video camera 4 is a CC installed inside the dark box 3.
D With a small monochrome (or color) video camera, light leakage at the contact portion between the inner peripheral surface of the ring gauge 2 and the outer peripheral surface of the piston ring 10 is photographed through the slit hole 11 to generate a light leakage image.

The second video camera 5 is installed outside the dark box 3 and shoots the light leakage angle scale or the light leakage circumference scale set on the stand 6 to generate an image of the light leakage angle scale or the light leakage circumference scale. The leak light angle scale or the leak light circumference scale is for measuring the magnitude of the leak light, and has a scale corresponding to the diameter of the piston ring 10 to be inspected.

The title developer 7 synthesizes the light leakage image from the first video camera 4 and the light leakage angle scale or the light leakage perimeter scale image from the second video camera 5, and displays the synthesized image on the monitor display 9.

In addition to recording the state of light leakage, the video recorder 8 can also record the light leakage standard for each product number of the piston ring 10 and display this on the monitor display 9.

The light leakage inspection will be described below. The piston ring 10 to be inspected is fitted into the inner circumference of the ring gauge 2 and set on the surface plate surface 12 of the dark box 3. At this time, the ring gauge receiver 13 on the surface plate surface 12 is adjusted and the ring gauge 2 is set so that the contact portion between the inner peripheral surface of the ring gauge 2 and the outer peripheral surface of the piston ring 10 overlaps the slit hole 11. . Of the light from the light source outside the dark box 3, the light leaked at the contact portion between the inner peripheral surface of the ring gauge 2 and the outer peripheral surface of the piston ring 10 is focused on the ring gauge 2 and the piston by using a close-up lens or a zoom lens. The first video camera 4 fitted to the contact portion of the ring 10 captures a leaked image. As described above, the light leakage inspection device 1 of the present invention measures light leakage in the direction opposite to that of the conventional light leakage inspection device 1a. As described above, in the present invention, since the video camera captures only the light passing through the gap between the ring gauge inner circumference and the piston ring outer circumference, the gap between the ring gauge inner circumference and the piston ring outer circumference is very small and passes through the clearance. Even if the light is weak, it can be detected reliably. Then, this leaked light image and the image of the leaked light angle scale or the leaked light circumference scale imaged by the second video camera 5 are sent to the title developer 7 and are combined, and are displayed on the monitor display 9 via the video recorder 8. Is displayed. An example of the leaked light image 14 and the leaked light angle scale 15 displayed on the screen of the monitor display 9 is shown in FIG. As described above, the inspector rotates the ring gauge 2 on the dark box 3 360 degrees without working in the dark room and without the method of marking the leaked portion of the piston ring 10, The magnitude of the leak light can be measured by observing the screen of the monitor display 9 shown in the figure and comparing it with the leak angle scale 15 (or the leak circumference scale) adjacent to the leak image 14.

[Embodiment 2] FIG. 2 shows another configuration example of the light leakage inspection machine.

In FIG. 2, the light leakage inspection device 1 includes a ring gauge 2 and
It comprises a dark box 3, a video camera 4, a personal computer 16, a superimposer 17, a monitor display 9 and a printer 18. Reference numeral 19 is a simple input device such as a mouse connected to the personal computer 16.

Since the ring gauge 2, the dark box 3, the video camera 4, and the monitor display 9 are the same as those described in the first embodiment, the description thereof will be omitted.

The personal computer 16 generates an image of a leak angle scale or a leak circumference scale according to the diameter of the piston ring 10 to be inspected for measuring the magnitude of leak light. Then, in the external storage device, the light leak standard, the light leak angle scale, and the light leak circumference scale screen are registered for each product number of the piston ring 10 to be inspected, and the light leak data is read by the mouse 19 and the registered data is compared, and the pass / fail judgment is made. Is done. In addition, the measurement data is recorded in an external storage device, the data is stored and utilized, and the printer 18 prints out.

The super imposer 17 synthesizes the leaked light image from the video camera 4 and the light leaked angle scale or the leaked light perimeter scale image from the personal computer 16 and displays them on the monitor display 9.

The light leakage inspection is the same as that in the first embodiment, and the ring gauge 2 and the piston ring 10 to be inspected are set on the surface plate surface 12 of the dark box 3, and the video camera 4 sets the inner peripheral surface of the ring gauge 2 and the outer peripheral surface of the piston ring 10. The leaked light of the contact part of is photographed, and this leaked light image and the light leak angle scale or the light leak circumference scale image generated by the personal computer 16 are sent to the super-imposer 17 and are combined, and displayed on the monitor display 9. To be done.

[Effect of device]

As described above, according to the present invention, a light leak image obtained by shooting a light leak at the contact portion between the ring gauge and the piston ring with a video camera and a second image for measuring the magnitude of the light leak are displayed on a monitor display. By synthesizing and displaying on the screen and indirectly observing the leaked light, the magnitude of the leaked light can be measured accurately and efficiently. Since the video camera is installed inside the dark box, only the light that passes through the gap between the ring gauge inner circumference and the piston ring outer circumference is photographed, so the gap between the ring gauge inner circumference and the piston ring outer circumference is very small. Therefore, even if the light passing through the gap is weak, it can be reliably detected.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a light leakage inspection machine according to a first embodiment of the present invention, FIG. 2 is a configuration diagram of a light leakage inspection machine according to a second embodiment of the present invention, and FIG.
The figure is an enlarged cross-sectional view of the dark box part, FIG. 4 is the enlarged front view of the surface plate surface part, FIG. 5 is a view showing an example of the screen of the monitor display, FIG. 6 is the cross-sectional view of the conventional light leakage inspection machine, and FIG. The figure is an enlarged view of the main part thereof. 1 is a light leakage inspection machine, 2 is a ring gauge, 3 is a dark box, 4 is a video camera, 6 is a stand, 7 is a title developer, 8 is a video recorder, 9 is a monitor display,
10 is a piston ring, 11 is a slit hole, 12 is a surface plate, 13 is a ring gauge receiver, 14 is a leak image, 15 is a leak angle scale, 16 is a personal computer, 17 is a superimposer, 18 is a printer, 19 is a mouse .

Claims (1)

[Scope of utility model registration request] 1. A dark box in which a slit hole is formed,
The ring gauge mounted on the slit hole forming surface of the dark box, and the slit hole for leaking light at the contact portion between the outer peripheral surface of the piston ring fitted on the inner peripheral surface of the ring gauge and the inner peripheral surface of the ring gauge. A video camera installed inside the dark box, a means for generating a second image for measuring the size of the leaked light, and the second image and the video camera. A piston ring light leakage inspection machine comprising: means for displaying a light leakage image and a composite display on a screen of a monitor display.