JP2002071321A - Deformation measuring apparatus for bore in cylinder block for internal-combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deformation measuring apparatus for a bore in a cylinder block for an internal-combustion engine, with which the deformation of the cylinder bore can be measured by excluding as much as possible complicated operations, such as disassembling operation, an assembling operation or the like. SOLUTION: The deformation-measuring apparatus for the bore in the cylinder block is provided with an infrared CCD camera 11, an infrared analyzer 12, an image analyzer 13 and a metal ring 14. The metal ring 14 has a shape, whose cross section is nearly elliptical, being fixed to the inner circumferential face of the bore 23 by an inorganic ceramic-based adhesive 15 to be used as a heat-insulating material, and it is maintained at a high temperature during the operation of the internal-combustion engine. The CCD camera 11 detects infrared rays, emitted from the metal ring 14 which is maintained at high temperatures. The temperature distribution of the metal ring 14 is changed into a visible image by the infrared analyzer 12, on the basis of the detected infrared rays. The image analyzer 13 measures the deformation state of the metal ring 14 which is changed into the visible image, and it measures the deformation state of the bore 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring bore deformation of a cylinder block for an internal combustion engine, which measures the amount of deformation of the bore of the cylinder block due to operation of the internal combustion engine.

[0002]

2. Description of the Related Art Normally, during operation of an internal combustion engine, combustion heat generated during an explosion stroke causes thermal expansion and deformation of a cylinder block. When the roundness of the inner peripheral surface of the bore (cylinder bore) decreases due to the deformation of the cylinder block, a partial sliding surface between the inner peripheral surface and the outer peripheral surface of the piston ring provided on the peripheral surface of the piston is formed. In such a case, a large gap may be formed, and a problem such as leakage of the combustion gas from the gap to the outside of the combustion chamber of the internal combustion engine may occur.

Therefore, conventionally, in order to grasp the degree of deformation of the cylinder bore due to the operation of the internal combustion engine, the deformation of the cylinder bore is measured by using, for example, a measuring piston ring described in Japanese Utility Model Application Laid-Open No. 4-54359. Proposed. FIG. 3 shows an outline of the piston ring for measurement.

The piston ring 100 is made of a steel material having a uniform material composition, a small elastic deformation, and a high rigidity. A top ring groove or an oil ring groove formed in a circumferential direction of an outer peripheral surface of a piston (not shown). Will be involved. The top ring groove or oil ring groove into which the piston ring 100 is engaged is provided with a pin (not shown) projecting from the bottom surface thereof, while the inner surface of the piston ring 100 has a recess 10 into which the pin is inserted.
2 are provided. By engaging the piston ring 100 in the top ring groove or the oil ring groove so that the pin is inserted into the concave portion 102, the relative movement of the ring 100 in the circumferential direction of the piston is restricted. .

When the internal combustion engine is operated with such a piston ring 100 engaged in a top ring groove or an oil ring groove, when the piston slides in the cylinder bore, the outer peripheral surface of the piston ring 100 In this case, a slide mark corresponding to the deformation of the bore is formed.

Since the relative movement of the piston ring 100 in the circumferential direction is restricted as described above, the sliding trace formed on the outer peripheral surface of the piston ring 100 is observed to determine the position of the cylinder bore itself. It becomes possible to know the modification.

[0007]

As described above, by using the piston ring 100 illustrated in FIG. 3, it is possible to know the deformation of the cylinder bore from the sliding trace. After the operation of the internal combustion engine, it cannot be observed that the piston ring 100 is not taken out by disassembling the internal combustion engine. For this reason, the measurement operation itself is extremely troublesome and troublesome.

The present invention has been made in view of the above circumstances, and has as its object to eliminate a troublesome work such as disassembly and assembly as much as possible and to measure a deformation mode of a cylinder bore for an internal combustion engine. The present invention provides a bore deformation measuring device.

[0009]

The means for achieving the above object and the effects thereof will be described below. According to a first aspect of the present invention, there is provided an apparatus for measuring bore deformation of a cylinder block for an internal combustion engine, which measures an amount of deformation of a bore of the cylinder block due to operation of the internal combustion engine. A gist comprising: a ring body provided; observation means for observing the state of the ring body from an internal combustion engine in an operating state; and analysis means for analyzing the state of the ring body observed by the observation means. And

According to the above configuration, during operation of the internal combustion engine, both the cylinder block and the ring body expand due to the heat generated by the combustion of the fuel, and the bore and the ring body of the cylinder block are deformed. At this time, the ring body deforms following the deformation of the bore of the cylinder block. The deformed ring body is observed through the observation means, and the observed deformation amount of the ring body is obtained using the analysis means, whereby the deformation amount of the bore of the cylinder block can be known. In addition, at the time of bore deformation measurement, if the ring body and the observation means are arranged in the internal combustion engine to be measured at the time of the first measurement, the work of arranging these ring bodies and the observation means again at the subsequent measurement is eliminated. It will be good. This eliminates the task of disassembling and assembling the internal combustion engine every time measurement is performed,
Bore deformation measurement can be performed with less troublesome work.

According to a second aspect of the present invention, in the apparatus for measuring bore deformation of a cylinder block for an internal combustion engine according to the first aspect, the ring body is made of a heat-insulated metal ring having a small heat capacity, and the observing means is provided. The point is to observe the temperature distribution of the metal ring.

According to the above configuration, during operation of the internal combustion engine, the heat generated during combustion of the fuel causes the metal ring to be heated to a high temperature.
Since the metal ring is an insulated ring having a small heat capacity, the temperature of the metal ring becomes higher than that of the bore of the cylinder block and other components in the bore, so that the metal ring can be observed accurately.

According to a third aspect of the present invention, in the apparatus for measuring bore deformation of a cylinder block for an internal combustion engine according to the second aspect, the metal ring has a substantially oval cross section. I do.

According to the above configuration, the metal ring is disposed in the bore in a state where the metal ring is in line contact with the bore of the cylinder block. Thus, when the internal combustion engine is operating, even if the metal ring becomes hot due to heat generated during combustion, the contact area between the metal ring and the bore is small, so that the heat of the metal ring is not easily transmitted to the cylinder block. Become. Therefore, the metal ring can be held at a high temperature.

According to a fourth aspect of the present invention, in the apparatus for measuring bore deformation of a cylinder block for an internal combustion engine according to the second aspect, the metal ring is disposed in the bore of the cylinder block via a heat insulating material. The gist is to become

According to the above configuration, during operation of the internal combustion engine, the temperature of the metal ring becomes high due to heat generated during fuel combustion.
Since the heat insulating material is disposed between the metal ring and the bore, the heat of the high-temperature metal ring is not easily transmitted to the cylinder block, and the metal ring can be held at a high temperature. .

According to a fifth aspect of the present invention, in the apparatus for measuring bore deformation of a cylinder block for an internal combustion engine according to the fourth aspect, the metal ring is formed by an inorganic ceramic adhesive serving as the heat insulating material. The gist is to be fixed to the inner peripheral surface of the.

According to the above configuration, it is not necessary to use a specially formed heat insulating member, so that the cost for measuring the bore deformation can be reduced. According to a sixth aspect of the present invention, in the apparatus for measuring bore deformation of a cylinder block for an internal combustion engine according to any one of the second to fifth aspects, the observation means is disposed in a hole communicating with a combustion chamber of the internal combustion engine. Infrared detecting means for detecting infrared rays emitted from the metal ring, and infrared analyzing means for visualizing the temperature distribution of the metal ring based on the intensity distribution of the infrared light detected by the infrared detecting means. Make a summary.

According to the above configuration, by using the infrared detecting means and the infrared analyzing means, it is possible to accurately visualize the shape of the deformed metal ring following the deformation of the bore of the cylinder block.

According to a seventh aspect of the present invention, in the apparatus for measuring bore deformation of a cylinder block for an internal combustion engine according to the sixth aspect, the infrared detecting means is an infrared camera having a lens having heat resistance. Make a summary.

According to the above configuration, even in the internal combustion engine in the operating state, it is possible to observe the inside of the bore of the cylinder block where the temperature is high. According to an eighth aspect of the present invention, in the apparatus for measuring bore deformation of a cylinder block for an internal combustion engine according to the sixth or seventh aspect, the analysis means determines a distance from a center to an outer edge of the visible metal ring. The gist is to measure at multiple locations.

According to the above configuration, since the metal ring deforms following the deformation of the bore of the cylinder block, the amount of deformation of the bore can be obtained by obtaining the amount of deformation of the visible metalized ring. become able to.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the apparatus for measuring bore deformation of a cylinder block for an internal combustion engine according to the present invention will be described below with reference to FIGS. First, a configuration of the bore deformation measuring apparatus for a cylinder block for an internal combustion engine will be described with reference to FIG.

As shown in FIG. 1, the bore deformation measuring device is provided with a bore (cylinder bore) of a cylinder block 22.
A metal ring 14 disposed at a position not interfering with the piston 24 on the inner peripheral surface of the lens 23, an infrared CCD camera 11 for detecting infrared rays emitted from the metal ring 14, and an infrared ray detected by the infrared CCD camera 11. It comprises an infrared analyzer 12 and an image analyzer 13 for performing image processing.

Here, the metal ring 14 is located at a position where it does not interfere with the piston 24 as described above, that is, at a position where it does not hinder the vertical movement of the piston 24 housed vertically in the bore 23 of the cylinder block 22. The piston 24 is fixed at a position closer to the cylinder head 20 than the top dead center of the vertical movement of the piston 24.

In the present embodiment, the metal ring 14 has an oval cross section and is engaged with the bore 23 in a state of being in line contact with the inner wall of the bore 23. As a result, even when the metal ring 14 is heated to a high temperature by the heat generated during combustion during operation of the internal combustion engine, the contact area between the metal ring 14 and the bore 23 is small.
Is hardly conducted to the cylinder block 22. That is, the metal ring 14 can be held at a high temperature.

As shown in FIG. 2 as an enlarged view corresponding to the part a in FIG. 1, this metal ring 14 is formed in the bore 23 of the cylinder block 22 by using an inorganic ceramic adhesive 15. It is fixed to. Since the inorganic ceramic adhesive 15 has heat insulation, the metal ring 14 can be held at a higher temperature.

On the other hand, the infrared CCD camera 11 includes a lens (not shown) made of a material having heat resistance, for example, quartz glass or the like. The infrared rays emitted from the metal ring 14 and incident on the infrared CCD camera 11 are taken into the infrared analyzer 12 via an appropriate cable. In the present embodiment, the infrared CCD camera 11 includes a glow plug (not shown) formed in a cylinder head 20 of the internal combustion engine (when the internal combustion engine is a diesel engine) or a spark plug (not shown) In the case of a gasoline engine), the glow plug or the spark plug is fixed in a through hole 21.

In this embodiment, the combustion chamber of the internal combustion engine in operation, specifically, the inside of the bore 23 of the cylinder block 22 is observed through the infrared CCD camera 11 fixed to the cylinder head 20 as described above. Is done. Further, since the infrared CCD camera 11 includes a lens made of quartz glass having heat resistance, even in the internal combustion engine in the operating state, it is possible to observe the inside of the bore 23 where the temperature becomes high. ing.

The infrared analyzer 12 analyzes the temperature distribution based on the infrared rays detected by the infrared CCD camera 11 and visualizes the temperature distribution on a monitor 13a of the image analyzer 13. By the way, in this temperature distribution analysis, for example, as in a well-known thermography, a region having a higher temperature is classified into a brighter color, and a region having a lower temperature is classified into a darker color. The temperature distribution in the bore 23, and eventually the metal ring 14 which is kept at a high temperature, is visualized.

The image analyzer 13 analyzes the image of the temperature distribution (the image 14 'of the metal ring 14) visualized on the monitor 13a by the infrared analyzer 12, and
This is a device for measuring the deformation of the bore 23 of the cylinder block 22 as follows.

That is, the distance r between the central axis 0 of the image 14 'of the metal ring 14 deformed by thermal expansion and its outer edge is determined at a plurality of points while referring to the image 14' of the temperature distribution displayed on the monitor 13a. (R1, r2,
r3, r4, ...). Here, since the metal ring 14 should have been deformed following the deformation of the bore 23 of the cylinder block 22, the deformation amount of the image 14 ′ of the metal ring 14 is obtained in this manner, The amount of deformation can be determined.

According to the bore deformation measuring apparatus for a cylinder block for an internal combustion engine according to this embodiment described in detail above,
The following excellent effects can be obtained. (1) Metal ring 1 deformed following deformation of bore 23
4 is observed using an infrared CCD camera 11 and an infrared analyzer 12, and the observed deformation of the metal ring 14 is obtained using the image analyzer 13, thereby obtaining the deformation of the bore 23 of the cylinder block 22. I can do it. In the bore deformation measurement, if the metal ring 14, the infrared analyzer 12 and the image analyzer 13 are arranged in the internal combustion engine to be measured at the first measurement, the infrared CCD camera 11 and the infrared analysis This eliminates the need to re-install the device 12 and the image analysis device 13. For this reason, every time the measurement is performed, the work of disassembling and assembling the internal combustion engine is eliminated, and the bore deformation measurement can be performed with less troublesome work.

(2) Since the metal ring 14 has an oblong cross-sectional shape, the contact between the metal ring 14 and the bore 23 becomes a line contact, and the heat of the metal ring 14 becomes high due to the operation of the internal combustion engine. Is not easily transmitted to the cylinder block 22. As a result, the metal ring 14 can be held at a high temperature.

(3) Since the metal ring 14 is fixed to the bore 23 with the inorganic ceramic adhesive 15 having heat insulating properties, the metal ring 14 can be held at a higher temperature. Become.

(4) Since the metal ring 14 is fixed to the bore 23 by the adhesive 15 having heat insulating property, it is not necessary to use a specially formed heat insulating member, and the cost for measuring the bore deformation can be reduced. You can plan.

(5) The infrared CCD camera 11 detects infrared rays emitted from the metal ring 14 and the bore 23 of the cylinder block 22, and the like, and the infrared analyzer 12 detects a metal based on the infrared rays detected by the infrared CCD camera 11. Since the ring 14 and the bore 23 are visualized as a temperature distribution image, the shape of the deformed metal ring 14 can be accurately visualized following the deformation of the bore 23.

(6) Since the infrared CCD camera 11 equipped with a quartz glass lens is used, it is possible to observe the inside of the bore 23 where the temperature of the cylinder block 22 becomes high, even in the internal combustion engine in operation. become able to.

(7) The distance r between the center axis 0 of the image 14 'of the metal ring 14 visualized by the infrared analyzer 12 using the image analyzer 13 and the outer edge thereof is determined at a plurality of locations (r1, r2, r3, r4,...), the deformation amount of the bore 23 can be obtained by obtaining the deformation amount of the image 14 ′ of the metal ring 14.

The configuration of the above embodiment can be appropriately changed, for example, as follows. In the above embodiment, the infrared CCD camera 11 is fixed to the glow plug or the ignition plug through hole 21 formed in the cylinder head 20 in parallel with the glow plug or the ignition plug.
The camera 11 may be configured to engage with a through hole formed in the internal combustion engine separately from the through hole 21.

In the above embodiment, the metal ring 14 is fixed to the bore 23 with the inorganic ceramic adhesive 15, but the type of the adhesive is arbitrary. In the above embodiment, the metal ring 14 is fixed in a state where the metal ring 14 and the inner periphery of the bore 23 are in contact with each other, but a heat insulating material is provided between the metal ring 14 and the bore 23. Is also good.

In the above embodiment, the metal ring 14 having an oval cross section is used, but the cross section of the metal ring 14 is arbitrary. In the above-described embodiment, the inside of the bore 23 is observed using the infrared CCD camera 11.
Instead of the D camera 11, the inside of the bore 23 may be observed using, for example, a fiber scope.

In FIG. 1, one cylinder of the internal combustion engine is shown as a representative for convenience, but the metal ring 14 and the infrared CCD camera 11 may be provided for each of a plurality of cylinders.

In the above embodiment, the metal ring 14 is observed by detecting infrared rays emitted from the metal ring 14. However, for example, the electromagnetic wave emitted from the metal ring is detected and observed. It may be. In this case, a device such as a camera capable of detecting an electromagnetic wave and a device for visualizing the intensity distribution of the electromagnetic wave incident on the device are used.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a bore deformation measuring device for a cylinder block for an internal combustion engine according to the present invention.

FIG. 2 is an enlarged partial cross-sectional view showing a part a of FIG. 1;

FIG. 3 is a front view showing a measurement piston ring used for conventional bore deformation measurement.

[Explanation of symbols]

11: infrared CCD camera, 12: infrared analyzer, 1
3 image analyzer, 13a monitor, 14 metal ring, 14 'image of metal ring, 15 adhesive, 20
Cylinder head, 21 through hole, 22 cylinder block, 23 bore, 24 piston.

Claims (8)

[Claims] 1. A bore deformation measuring apparatus for a cylinder block for an internal combustion engine for measuring an amount of deformation of a bore of the cylinder block due to an operation of the internal combustion engine, wherein the bore is disposed at a position on the inner peripheral surface of the bore so as not to interfere with the piston. An internal combustion engine comprising: a ring body; an observation unit for observing a state of the ring body from an internal combustion engine in an operating state; and an analysis unit for analyzing a state of the ring body observed by the observation unit. Deformation measurement device for cylinder block. 2. The cylinder block for an internal combustion engine according to claim 1, wherein said ring body is made of a heat-insulated metal ring having a small heat capacity, and said observing means observes a temperature distribution of said metal ring. Bore deformation measuring device. 3. An apparatus for measuring bore deformation of a cylinder block for an internal combustion engine according to claim 2, wherein said metal ring has a substantially oval cross section. 4. The apparatus according to claim 2, wherein the metal ring is disposed in a bore of the cylinder block via a heat insulating material. 5. The bore deformation measuring apparatus for a cylinder block for an internal combustion engine according to claim 4, wherein the metal ring is fixed to an inner peripheral surface of the bore by an inorganic ceramic adhesive serving as the heat insulating material. . 6. An infrared detecting means disposed in a hole leading to a combustion chamber of the internal combustion engine for detecting infrared light emitted from the metal ring, and an intensity of the infrared light detected by the infrared detecting means. An apparatus for measuring bore deformation of a cylinder block for an internal combustion engine according to any one of claims 2 to 5, further comprising infrared analysis means for visualizing a temperature distribution of the metal ring based on the distribution. 7. The apparatus according to claim 6, wherein said infrared detecting means is an infrared camera provided with a lens having heat resistance. 8. The bore of a cylinder block for an internal combustion engine according to claim 6, wherein said analysis means measures the distance from the center of the metal ring visualized to the outer edge at a plurality of locations. Deformation measuring device.