JP5424860B2 - Cylinder inner diameter measuring method and measuring device - Google Patents

Description

  The present invention relates to a cylinder inner diameter measuring method for measuring the inner diameter of a cylinder liner of an internal combustion engine and a measuring apparatus therefor.

  In general, cylinder liners used in internal combustion engines such as ships are used in a high output state, so periodic inspections are required at regular intervals. During periodic inspections, the cylinder liner inner diameter is measured, If the wear of the liner exceeds a predetermined level, it is replaced with a new cylinder liner.

  An example of a method for measuring the inner diameter of a cylinder liner is to remove the cylinder cover at the top of the cylinder liner, install a contact-type measuring instrument with a person inside, and measure the inner diameter of the cylinder liner with a contact-type measuring instrument. There is something.

  Another example of the method for measuring the inner diameter of the cylinder liner is to remove the fuel injection device arranged on the cylinder cover and insert a contact-type measuring instrument into the fuel injection hole of the fuel injection device to measure the inner diameter of the cylinder liner. Some have an insertion hole in a cylinder cover, and a contact-type measuring instrument is inserted into the insertion hole to measure the inner diameter of the cylinder liner (see, for example, Patent Document 1).

  Further, as another example of the method for measuring the inner diameter of the cylinder liner, there is a method of measuring the inner diameter of the cylinder liner by arranging a contact-type measuring device in the cylinder liner from the scavenging port of the cylinder liner.

  Here, as an example of a contact-type measuring instrument, a plurality of arms are deployed from the axial center position inside the cylinder liner, the contact portion is brought into contact with the inner wall surface of the cylinder liner, and a measuring element such as an electronic micrometer is used. Some measure the inner diameter of the cylinder liner.

Japanese Patent No. 2936764

  However, in the case where a person enters the inside and installs a contact-type measuring instrument, there is a problem that a lot of labor and time are required because it is necessary to remove the cylinder cover. Moreover, since the height position of the inner diameter of the cylinder liner must be measured with another measuring tool every time measurement is performed, an error is caused by a measurer, and the accuracy of recording at the inner diameter of the cylinder liner and the measurement position is reduced. There was a problem that the reproducibility was lowered.

  When a contact-type measuring device is inserted into the fuel injection hole of the cylinder cover, it is necessary to remove the fuel injection device from the cylinder cover. In addition, when an insertion hole is provided in the cylinder cover in advance and a contact-type measuring instrument is inserted into the insertion hole, it is necessary to provide an insertion hole in the cylinder cover, which requires a lot of labor and time. It was. Further, when an insertion hole is provided on the shaft center in the cylinder liner, members such as an exhaust valve become an obstacle, so that it has been very difficult to apply in the current uniflow scavenging engine.

  When a contact-type measuring device is arranged in the cylinder liner from the scavenging port of the cylinder liner, there is a problem that it is very difficult to install the contact-type measuring device on the axis in the cylinder liner. .

  Further, when a contact type detector is used, there is a problem that when the cylinder liner is in a high temperature state, temperature expansion of the contact portion is unavoidable and the measured value is not stable. In addition, the contact type detector has a problem that an arm or the like is developed in the cylinder liner, so that the number of parts is increased with a complicated configuration, and assembly takes time.

  In view of such circumstances, the present invention is intended to provide a cylinder inner diameter measuring method and a measuring apparatus for measuring the inner diameter of a cylinder liner appropriately and easily without being arranged on the axis of the cylinder liner. .

Measurement method of a cylinder inner diameter of the present invention, in the cylinder liner constituting the internal combustion engine, a rotary table which can rotate in the inner peripheral direction of the cylinder liner, and horizontal displacement meter disposed on the turntable, the turntable Insert the vertical displacement meter placed in the scavenging port of the cylinder liner and install it.
Rotating the turntable to obtain the rotation angle θ of the horizontal displacement meter, and measuring the distance to the inner wall surface of the cylinder liner in a non-contact manner by the horizontal displacement meter to obtain horizontal displacement data L,
From the rotation angle θ and the displacement data L, the X component value by the product of the cosine COSθ of the rotation angle and the displacement data L and / or the Y component value by the product of the sine SINθ of the rotation angle and the displacement data L are obtained. Calculate the inner diameter
The vertical displacement meter is used to measure the distance to the ceiling surface of the cylinder cover in a non-contact manner, acquire vertical displacement data, and determine the height position of the inner diameter of the cylinder liner .

  In the cylinder inner diameter measuring method of the present invention, it is preferable to calculate the inner diameter of the cylinder liner by adding the absolute value of the maximum value and the absolute value of the minimum value of the X component values.

  In the cylinder inner diameter measuring method of the present invention, it is preferable to calculate the inner diameter of the cylinder liner by adding the absolute value of the maximum value and the absolute value of the minimum value of the Y component values.

The cylinder inner diameter measuring device of the present invention is located inside the cylinder liner constituting the internal combustion engine, and can be rotated in the inner circumferential direction of the cylinder liner;
A horizontal displacement meter disposed on the turntable and measuring the distance to the inner wall surface of the cylinder liner in a non-contact manner;
A vertical displacement meter that is disposed on the turntable and measures the distance to the ceiling surface of the cylinder cover in a non-contact manner;
From the rotation angle θ of the horizontal displacement meter rotated by the turntable and the horizontal displacement data L measured by the horizontal displacement meter, the X component value by the product of the cosine COSθ of the rotation angle and the displacement data L, and And / or a control unit that calculates the inner diameter of the cylinder liner by obtaining a Y component value by the product of the sine SINθ of the rotation angle and the displacement data L.

In the cylinder inner diameter measuring device according to the present invention, the rotary table, the horizontal displacement meter, and the vertical displacement meter have a size that can be inserted into the cylinder liner from the scavenging port , and the rotary table is a piston head. It is preferable to provide the structure installed in the upper surface.

  According to the cylinder inner diameter measuring method and the measuring apparatus of the present invention, the rotation angle θ of the horizontal direction displacement meter is acquired by rotating the turntable, and the inner surface of the cylinder liner is contacted without contact by the horizontal direction displacement meter. The horizontal displacement data L is obtained by measuring the distance. From the rotation angle θ and the displacement data L, the X component value by the product of the cosine COSθ of the rotation angle and the displacement data L and / or the sine SINθ of the rotation angle and the displacement Since the inner diameter of the cylinder liner is calculated by obtaining the Y component value by the product of the data L, even if the rotating shaft of the turntable and the horizontal displacement meter are not installed on the axis in the cylinder liner, the cylinder liner The inner diameter can be measured. Also, since the turntable and horizontal displacement meter are installed by inserting them from the scavenging port into the cylinder liner, removing the cylinder cover, removing the fuel injection device, and inserting holes as in the case of installing a conventional measuring instrument This eliminates the need for the formation of, thus reducing a lot of labor and time and providing an excellent effect that the inner diameter of the cylinder liner can be easily measured.

It is a front view which shows the concept of the measuring apparatus of the cylinder internal diameter of this invention. It is a top view which shows the concept of the measuring apparatus of the cylinder internal diameter of this invention. It is a conceptual diagram which shows the state which inserts the measuring apparatus of a cylinder internal diameter from a scavenging port in a cylinder liner. It is a table | surface which shows a rotation angle and displacement data. It is a flow which shows the measuring method of the cylinder internal diameter of this invention. It is a conceptual diagram which shows the state which calculates | requires X component value and Y component value from a rotation angle and displacement data.

  Embodiments of the present invention will be described below with reference to FIGS.

  A cylinder inner diameter measuring method and measuring apparatus according to an embodiment are applied to an internal combustion engine 1 such as a ship, and the internal combustion engine 1 is positioned on a cylindrical cylinder liner 2 and an upper portion of the cylinder liner 2. A cylinder cover 3 and a piston head 4 that reciprocates inside the cylinder liner 2 are provided, and a plurality of scavenging ports 5 are formed on the lower peripheral surface of the cylinder liner 2 (see FIG. 3).

  Also, the cylinder inner diameter measuring method and the measuring device are a rotating table 6 disposed on the upper surface 4 a of the piston head 4, a laser-type horizontal displacement meter 7 installed on the upper surface of the rotating table 6, and a laser-type vertical direction. A displacement meter 8 and a control unit 9 for processing the rotation angle θ from the turntable 6 and the displacement data from the horizontal direction displacement meter 7 and the vertical direction displacement meter 8 are provided.

  The turntable 6 includes a support stand 11 having a plurality of support legs 10 at the bottom, and can be stably disposed on the upper surface 4 a of the piston head 4. A motor 12 that rotates in the circumferential direction of the liner 2 is disposed.

  The horizontal displacement meter 7 includes a mechanism that oscillates the laser beam r1 with respect to the inner wall surface 2a of the cylinder liner 2, and acquires displacement data depending on the angle difference of the laser beam r1 reflected from the inner wall surface 2a of the cylinder liner 2. It is supposed to be. Here, the laser oscillation position 7 a of the horizontal displacement meter 7 coincides with the rotation center of the turntable 6. In addition, an adjustment mechanism unit 13 that can adjust the angle of the turntable 6 is provided between the support table 11 and the turntable 6, and the laser beam r 1 of the horizontal displacement meter 7 is perpendicular to the inner wall surface 2 a of the cylinder liner 2. It is trying to become.

  The vertical displacement meter 8 includes a mechanism that oscillates the laser beam r2 with respect to the ceiling surface 3a of the cylinder cover 3, and displacement data (see FIG. 5) depends on the angle difference of the laser beam r2 reflected from the ceiling surface 3a of the cylinder cover 3. (Not shown). Further, the adjustment mechanism unit 13 positioned between the support base 11 and the rotary base 6 is configured so that the laser beam r2 of the vertical displacement meter 8 is perpendicular to the ceiling surface 3a of the cylinder cover 3.

  The control unit 9 is connected to the turntable 6, the horizontal direction displacement meter 7, and the vertical direction displacement meter 8 through a connection cable 14 so that transmission and reception are possible, and can be disposed on the upper surface 4 a of the piston head 4. It has become. Further, the control unit 9 includes a power supply unit 9a so that power can be supplied to the turntable 6, the horizontal displacement meter 7, the vertical displacement meter 8, and the like. Further, the control unit 9 incorporates a processing program that can perform the flow processing of FIG.

  The operation of the embodiment of the present invention will be described below.

  When measuring the inner diameter and surface roughness of the cylinder liner 2, the driving of the internal combustion engine 1 is stopped and the piston head 4 is arranged at the lowest point so that the upper surface 4 a of the piston head 4 is exposed from the scavenging port 5. At the same time, the temperature of the cylinder liner 2 is lowered. Next, as shown in FIG. 3, a cylinder inner diameter measuring device is inserted into the cylinder liner 2 from the scavenging port 5, and the rotary table 6 and the control unit 9 are installed on the upper surface of the piston head 4, and the horizontal displacement meter 7 and the vertical direction are arranged. The position of the displacement meter 8 is adjusted by the adjustment mechanism unit 13 or the like so that measurement is possible. Here, the control unit 9 may be installed on the outside of the cylinder liner 2 or on the wall surface of the cylinder liner 2, and particularly if the horizontal displacement meter 7 and the vertical displacement meter 8 can be measured. It is not limited.

  Subsequently, the rotating table 6 is rotated at least once in the inner circumferential direction of the cylinder liner 2 by the motor 12 or the like, and the rotation angle θ of the horizontal displacement meter 7 is acquired. At the same time, the laser beam r1 is oscillated from the horizontal displacement meter 7; The distance from the laser oscillation position 7 a of the horizontal displacement meter 7 to the inner wall surface 2 a of the cylinder liner 2 is acquired as horizontal displacement data L, and the horizontal displacement data L corresponding to each rotation angle θ is sent to the control unit 9. Record. Here, in the control unit 9, as shown in the example of FIG. 4, the horizontal displacement data L (in FIG. 4, the rotation angle θ (shown on the left column 15 in FIG. 4)) obtained continuously every 1 °. The right column 16 is shown). Depending on the measurement conditions, the rotation angle θ for recording the horizontal displacement data may be recorded for each angle smaller than 1 ° or may be recorded for each angle larger than 1 °. The distance from the laser oscillation position 7 a of the horizontal displacement meter 7 to the inner wall surface 2 a of the cylinder liner 2 is equal to the distance from the rotation center of the turntable 6 to the inner wall surface 2 a of the cylinder liner 2.

  Simultaneously with the measurement of the horizontal displacement meter 7, the laser beam r 2 is oscillated from the vertical displacement meter 8 toward the ceiling surface 3 a of the cylinder cover 3, and from the laser oscillation position 8 a of the vertical displacement meter 8 to the ceiling of the cylinder cover 3. The distance to the surface 3a is acquired as displacement data in the vertical direction, and the displacement data in the vertical direction is recorded in the control unit 9.

  As shown in FIG. 6, the control unit 9 calculates the product (COSθ · L) of the cosine COSθ of the rotation angle and the displacement data L from the rotation angle θ and the horizontal displacement data L as in step S1 of FIG. X component value is obtained. Next, the maximum value and the minimum value of the X component values are extracted as in step S2 in FIG. 5, and the absolute value of the maximum value and the minimum value are added as in step S3 to calculate the inner diameter of the cylinder liner 2. To do. Here, the maximum value (that is, the longest in the plus (+) direction) and the minimum value (that is, the longest in the minus (−) direction) of the X component value are lines parallel to the measurement start position of the cylinder liner 2 and Since it is on the same line as the inner diameter, adding the absolute value of the maximum value and the absolute value of the minimum value gives the inner diameter in the 0 ° and 180 ° directions from the start position. Further, in the processing from step S1 to S3, it may be confirmed whether or not the maximum value and the minimum value are on the same line, and it is confirmed that the maximum value and the minimum value are on the same line. Then, the absolute value of the maximum value and the absolute value of the minimum value may be added. Further, when the maximum value and the minimum value are not on the same straight line, the measurement may be performed again.

  Subsequently, the control unit 9 calculates the product (SINθ · L) of the rotation angle sine SINθ and the displacement data L from the rotation angle θ and the horizontal displacement data L as shown in step S4 of FIG. The Y component value is determined as shown. Next, the maximum value and the minimum value of the Y component value are extracted as in step S5 of FIG. 5, and the absolute value of the maximum value and the absolute value of the minimum value are added as in step S6 to calculate the inner diameter of the cylinder liner 2. To do. Here, the maximum value of the Y component value (that is, the longest in the plus (+) direction) and the minimum value (that is, the longest in the minus (−) direction) are lines that are perpendicular to the measurement start position of the cylinder liner 2 on the horizontal plane and are vertical. Since it is on the same line as the inner diameter on the line, the inner diameter in the 90 ° and 270 ° directions from the starting position is obtained by adding the absolute value of the maximum value and the absolute value of the minimum value. In the processing from step S4 to S6, it may be confirmed whether or not the maximum value and the minimum value are on the same straight line, and it is confirmed that the maximum value and the minimum value are on the same straight line. Then, the absolute value of the maximum value and the absolute value of the minimum value may be added. Further, when the maximum value and the minimum value are not on the same straight line, the measurement may be performed again.

  Unlike the flow of FIG. 5, the control unit 9 uses the product of the cosine COSθ of the rotation angle and the displacement data L (COSθ · L) and the product of the sine SINθ of the rotation angle and the displacement data L (SINθ · The Y component value by L) may be obtained simultaneously to calculate the inner diameter of the cylinder liner 2, or as a simple measurement, the X component value by the product of the cosine COSθ of the rotation angle and the displacement data L (COSθ · L), or the rotation The inner diameter of the cylinder liner 2 may be calculated by obtaining only one of the Y component values by the product of the angle sine SINθ and the displacement data L (SINθ · L).

  Further, the control unit 9 calculates the inner diameter of the cylinder liner 2 and determines the height position of the inner diameter of the cylinder liner 2 using the displacement data in the vertical direction. Here, before measuring the inner diameter of the cylinder liner 2, the height position of the inner diameter of the cylinder liner 2 may be measured in advance, or the inner diameter of the cylinder liner 2 may be increased by a process different from the measurement of the inner diameter of the cylinder liner 2. The position may be determined.

  Thus, according to such an embodiment, the rotating table 6 is rotated to acquire the rotation angle θ of the horizontal displacement meter 7 and the cylinder liner is contacted by the laser type horizontal displacement meter 7 in a non-contact manner. 2 is measured to obtain horizontal displacement data (measurement distance) L. From the rotation angle θ and the horizontal displacement data L, the product of the cosine COSθ of the rotation angle and the displacement data L X component value and / or Y component value by the product of rotation angle sine SINθ and displacement data L is obtained to calculate the inner diameter of the cylinder liner 2. Even if it is not installed on the axial center in the liner 2, the inner diameter of the cylinder liner 2 can be measured. Further, when the inner diameter of the cylinder liner 2 is measured by obtaining both the X component value obtained by the product of the cosine COSθ of the rotation angle and the displacement data L and the Y component value obtained by the product of the sine SINθ of the rotation angle θ and the displacement data L, The accuracy of the measured value of the inner diameter of the cylinder liner 2 can be improved, and the measurement can be performed more suitably.

  Further, since the turntable 6 and the horizontal displacement meter 7 are inserted into the cylinder liner 2 through the scavenging port 5, the cylinder cover 3 and the fuel injection device are removed as in the case of installing a conventional measuring instrument. In addition, it is not necessary to form an insertion hole, and therefore, much labor and time can be reduced, and the inner diameter of the cylinder liner 2 can be easily measured.

  In addition, it eliminates the need to form an insertion hole located on the axial center of the cylinder liner 2 as in the case of installing a conventional measuring instrument, so that the current uniflow can be achieved without interfering with members such as exhaust valves on the axial center. A scavenging engine can be easily applied.

  Unlike the case of using a conventional contact type detector, even when the cylinder liner 2 is in a high temperature state, the laser type horizontal displacement meter 7 and the laser type vertical displacement meter 8 are used. It is not necessary to consider the temperature expansion of the contact portion, and the inner diameter of the cylinder liner 2 can be measured easily and appropriately. Furthermore, unlike the case of using a conventional contact type detector, an arm or the like that is deployed in the cylinder liner 2 is not required, so the number of parts can be reduced with a simple configuration, and the inner diameter of the cylinder liner 2 can be easily measured. Can do.

  In the embodiment, a vertical displacement meter 8 disposed on a turntable 6 is installed inside a cylinder liner 2 constituting the internal combustion engine 1, and the ceiling surface of the cylinder cover 3 is contacted by the vertical displacement meter 8 in a non-contact manner. After measuring the distance to 3a and obtaining vertical displacement data and determining the height position of the inner diameter of the cylinder liner 2, the height position of the inner diameter of the cylinder liner 2 is kept constant and compared with the conventional data. The inner diameter of the cylinder liner 2 can be measured suitably. Further, at the height position of the inner diameter of the cylinder liner 2, it is not necessary to perform measurement with another measuring tool every time measurement is performed as in the conventional example, so that the recording accuracy at the inner diameter and measurement position of the cylinder liner 2 is increased, Reproducibility can be improved.

  In the embodiment, the absolute value of the maximum value in the X component value and the absolute value of the minimum value are added to calculate the inner diameter of the cylinder liner 2, or the absolute value of the maximum value in the Y component value and the minimum value When the inner diameter of the cylinder liner 2 is calculated by adding the absolute values of the cylinder liner 2, the inner diameter of the cylinder liner 2 can be calculated more easily and appropriately.

  It should be noted that the cylinder inner diameter measuring method and the measuring apparatus according to the present invention are not limited to the above-described illustrated examples, and various changes can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Cylinder liner 2a Inner wall surface 3 Cylinder cover 3a Ceiling surface 4 Piston head 4a Upper surface 5 Scavenging port 6 Turntable 7 Horizontal displacement meter 8 Vertical displacement meter 9 Control part L Horizontal displacement data r1 Laser beam r2 Laser Light θ Rotation angle

Claims (5)

Inside the cylinder liner constituting the internal combustion engine, there are a turntable capable of rotating in the inner circumferential direction of the cylinder liner, a horizontal displacement meter arranged on the turntable, and a vertical displacement meter arranged on the turntable. Insert it from the scavenging port of the cylinder liner,
Rotating the turntable to obtain the rotation angle θ of the horizontal displacement meter, and measuring the distance to the inner wall surface of the cylinder liner in a non-contact manner by the horizontal displacement meter to obtain horizontal displacement data L,
From the rotation angle θ and the displacement data L, the X component value by the product of the cosine COSθ of the rotation angle and the displacement data L and / or the Y component value by the product of the sine SINθ of the rotation angle and the displacement data L are obtained. Calculate the inner diameter
Cylinder inner diameter measurement characterized in that the vertical displacement data is obtained by measuring the distance to the ceiling surface of the cylinder cover in a non-contact manner by the vertical displacement meter and determining the height position of the inner diameter of the cylinder liner. Method.   2. The cylinder inner diameter measuring method according to claim 1, wherein the inner diameter of the cylinder liner is calculated by adding the absolute value of the maximum value and the absolute value of the minimum value of the X component values.   2. The cylinder inner diameter measuring method according to claim 1, wherein the inner diameter of the cylinder liner is calculated by adding the absolute value of the maximum value and the absolute value of the minimum value of the Y component values. A turntable positioned inside a cylinder liner constituting the internal combustion engine and capable of rotating in the inner circumferential direction of the cylinder liner;
A horizontal displacement meter disposed on the turntable and measuring the distance to the inner wall surface of the cylinder liner in a non-contact manner;
A vertical displacement meter that is disposed on the turntable and measures the distance to the ceiling surface of the cylinder cover in a non-contact manner;
From the rotation angle θ of the horizontal displacement meter rotated by the turntable and the horizontal displacement data L measured by the horizontal displacement meter, the X component value by the product of the cosine COSθ of the rotation angle and the displacement data L, and A cylinder inner diameter measuring device comprising: a control unit that calculates a Y liner value by a product of sine SINθ of rotation angle and displacement data L and calculates an inner diameter of a cylinder liner. The turntable, the horizontal displacement meter, and the vertical displacement meter have a size that can be inserted into the cylinder liner from the scavenging port , and the turntable has a structure installed on the upper surface of the piston head. The cylinder inner diameter measuring device according to claim 4 , wherein the measuring device is a cylinder inner diameter measuring device.

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