JPH0749929B2 - Piston ring wear measurement method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a piston ring wear measuring method for detecting a wear state of a piston ring of, for example, an internal combustion engine or a compressor.

[Conventional technology]

To measure the amount of wear of a piston ring attached to a piston of a conventional engine or the like, the thickness of the piston ring C is measured by a micrometer 11 in advance before inserting it into the ring groove of the piston as shown in FIG. After operating the engine for an arbitrary time, open the engine, take out the piston ring C again, measure the thickness of the piston ring C in the same manner as above, and obtain the difference in the thickness of the piston ring C before and after the operation. I was going.

[Problems to be solved by the invention]

In the conventional measurement of the amount of wear of the piston ring of the engine, etc., it is necessary to operate the engine etc. for an arbitrary time, stop it, pull out the piston from the cylinder liner, and further remove the piston ring from the piston. It was. In recent years, in marine engines and the like,
Long-term open operation is required, and it is necessary to grasp the change in the wear amount of the piston ring without stopping and opening the engine, but this cannot be done by the conventional method. there were.

The present invention is intended to solve the above problems.

[Means for solving problems]

The present invention, when measuring the amount of wear of a piston ring whose one surface used for an engine or the like is inclined toward the center, has an end embedded in a through hole that traverses the side wall of a cylinder liner, with the end embedded toward the inside of the cylinder. An optical fiber for light and an optical fiber for reflected light, a light source to which the other end of the incident light optical fiber is connected, a light receiver to which the other end of the reflected light optical fiber is connected, and the piston ring is fitted. And a measuring device composed of a speed detector for detecting the moving speed of the piston and a computing device in which the light receiver and the speed detector are connected by an electric wire, and the tip of the optical fiber for incident light and the optical fiber for reflected light. When the piston ring passes through, the reflected light of the light sent from the light source and emitted from the optical fiber for incident light is captured by the light receiver, the light receiving time of the reflected light is measured, and the light receiving time and the speed detection are performed. There calculates the width of the piston ring than the moving speed of the piston detected, further obtains a reduction amount and the amount of wear of the piston ring than the inclination angle of the piston ring of the width of the piston ring.

[Action]

In the above, when there is a piston ring at a position where the light sent from the light source and emitted from the end of the optical fiber for incident light hits the piston ring, the above light is reflected by the piston ring, and the reflected light is for reflected light. The light is received by the optical fiber, converted into an electric signal by the light receiver, and sent to the arithmetic unit. In the computing device, the time when the piston ring is reflecting light from the electric signal is calculated, and the moving speed of the piston is calculated by the electric signal sent from the speed detector. The width of the piston ring is calculated from the light reflection time of the piston ring.

The width of the piston ring calculated as described above is required to be different from that before the start of operation.Furthermore, one side of the piston ring is inclined toward the center and has a constant inclination angle. The wear amount of the piston ring is obtained by the above-mentioned arithmetic device using the difference in the width of the piston ring and the inclination angle.

As described above, the wear condition of the piston ring can be constantly monitored, so that it is not necessary to frequently open the engine or the like, and the replacement time of the piston ring can be predicted, so that the reliability of the engine or the like is improved.

〔Example〕

 An apparatus according to one embodiment of the present invention is shown in FIGS. 1 and 2.

The apparatus of the present embodiment shown in FIGS. 1 and 2 has an optical fiber 1 for incident light and an optical fiber for reflected light in which an end portion is embedded in a cylinder in a through hole that traverses a side wall of a cylinder liner B. The optical fiber 2, the light source 3 to which the other end of the incident light optical fiber 1 is connected, the light receiver 4 to which the other end of the reflected light optical fiber 2 is connected, and the flywheel D such as an engine are attached. A mark detecting sensor 7 installed at a position corresponding to the marker 9 and connected to the amplifier 8 by an electric wire,
The amplifier 8 and the light receiver 4 are provided with a measuring device composed of a computing unit 6 connected by an electric wire via an A / D converter 5, and the amount of wear of the piston ring C is measured by the above measuring device. Is used to measure the width of the piston ring C of the engine and the like, and then the difference in the width of the piston ring C before the start of the operation and in the operating state is obtained. From the difference, the calculator 6 wears the piston ring C. It is done by calculating.

In the above, the optical fiber 1 for incident light sent from the light source 3
When there is the piston ring C at the position where the light emitted from the end of the light hits the piston ring C, the above light is reflected by the piston ring C, and the reflected light is received by the optical fiber 2 for reflected light and the light receiver. It is converted into an electric signal in 4 and is digitally converted in the A / D converter 5 and then sent to the arithmetic unit 6. When the mark detection sensor 7 detects the marker 9 installed on the flywheel D, it sends an electric signal to the amplifier 8, and the electric signal is amplified and digitally converted by the A / D converter 5 and sent to the calculator 6. The arithmetic unit 6 which has received the above signal obtains the time during which the piston ring C is reflecting light from the electric signal from the light receiver 4, and obtains the moving speed of the piston A from the electric signal from the mark detecting sensor 7. The width of the piston ring C is calculated from the light reflection time and the moving speed of the piston A.

The above-described measurement of the width of the piston ring C is performed before the operation of the engine or the like is started and in the operating state, and the value measured before the operation is stored in the calculator 6 and is the same as the value measured in the operating state. Is calculated by the arithmetic unit 6.

When the difference in the width of the piston ring C before starting the operation and in the operating state is obtained as described above, one side of the piston ring is inclined toward the center, and therefore the amount of wear of the piston ring C is the third. As shown in the figure, the wear amount is t, the tilt angle of the piston ring is θ, the width of the piston ring C before the start of operation is l ₁ , the width of the piston ring C in the operation state is l ₂ , l ₁
The wear amount t is expressed by the following equation, where Δl is the difference between 1 and l ₂ .

The computing unit 6 calculates the wear amount of the piston ring C by the above formula and outputs it to the display.

As described above, the wear condition of the piston ring can be monitored at all times, so that it is not necessary to open the engine frequently, and the replacement time of the piston ring can be predicted, so that the reliability of the engine is improved.

〔The invention's effect〕

In the present invention, a measuring device including an optical fiber for incident light and an optical fiber for reflected light, the ends of which are embedded in a cylinder liner of an engine or the like, is provided, and before the operation of the engine or the like is started using the same measuring device. By calculating the difference in the width of the piston ring from the operating state and calculating the amount of wear of the piston ring from the difference, it becomes possible to constantly monitor the wear state of the piston ring, so open the engine frequently. The reliability of the engine etc. has been improved because it is no longer necessary and the time to replace the piston ring can be predicted.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of the present invention, and FIG. 2 is a view of FIG.
II-II arrow view, FIG. 3 is an explanatory view for calculating the wear amount of the above-described embodiment, and FIG. 4 is an explanatory view of a conventional technique. 1 ... Incident light optical fiber, 2 ... Reflected light optical fiber, 3 ... Light source, 4 ... Photoreceiver, 5 ... A / D converter, 6
…… Calculator, 7 …… Mark detection sensor, 8 …… Amplifier, 9 …… Marker, 11 …… Micrometer

Front page continuation (72) Inventor Kazuhiko Maekawa 1-1, Atsunoura-machi, Nagasaki-shi, Nagasaki Mitsubishi Heavy Industries, Ltd. Nagasaki Research Institute (72) Inventor Bunji Takahashi 1-1, Atsunoura-cho, Nagasaki-shi, Nagasaki Mitsubishi Heavy Industries Ltd. Company Nagasaki Research Institute (72) Inventor Masatoshi Kanemaru 1-1, Atsunoura-machi, Nagasaki-shi, Nagasaki Mitsubishi Heavy Industries, Ltd. Nagasaki Research Institute (72) Inventor Yukio Akizuki 1-1, Atsunoura-cho, Nagasaki-shi, Nagasaki Mitsubishi Heavy Industries Ltd. Company Nagasaki Research Institute (72) Inventor Hiroshi Nita Toge, Toranomon 1-2-4, Minato-ku, Tokyo Inside Mitsubishi Petrochemical Co., Ltd.

Claims (1)

[Claims] 1. When measuring the amount of wear of a piston ring whose one surface used in an engine or the like is inclined toward the center, an incident end is embedded in a cylinder in a through hole that crosses a side wall of a cylinder liner. An optical fiber for light and an optical fiber for reflected light, a light source to which the other end of the incident light optical fiber is connected, a light receiver to which the other end of the reflected light optical fiber is connected, and the piston ring is fitted. And a measuring device composed of a speed detector for detecting the moving speed of the piston and a computing device in which the light receiver and the speed detector are connected by an electric wire, and the tip of the optical fiber for incident light and the optical fiber for reflected light. When the piston ring passes, the reflected light of the light sent from the light source and emitted from the optical fiber for incident light is caught by the light receiver, and the light receiving time of the reflected light is measured. A ring wear measuring method characterized in that the width of the piston ring is calculated from the moving speed of the piston detected by the ejector, and the wear amount of the piston ring is calculated from the decrease amount of the piston ring width and the tilt angle of the piston ring. .