JPH04295712A - Measuring instrument for inner diameter of cylinder liner of internal combustion engine of ship and the like - Google Patents

Abstract

PURPOSE:To make it possible to simplify measuring work by providing hollow arms which are coupled with the inserting tip of an outer tube with pins, turned in the radial direction from the inside of the outer tube and contained in the outer tube through slits, and providing a linking mechanism. CONSTITUTION:An outer tube 5 which is inserted into a fuel jetting hole 4 is accurately positioned at the central part of a cylinder liner 2 with the smallest-diameter part at the lower part of the jetting hole 4 and an upper guide bush 9. Two hollow arms 6 as a pair are provided at the inserting tip of the outer tube 5. One end of each arm is coupled with the inside of the inserting tip of the outer tube 5 with a pin. The arm 6 is constituted so that the arm 6 is horizontally turned in the opposite direction with respect to the direction of the diameter of the outer tube 5 by 90 degrees. The turning of the arm 6 is controlled with a link mechanism. A measuring part 19 of an electronic micrometer 18 which is provided at the tip of the hollow arm 6 is in contact with the inner wall surface of the cylinder liner 2, and the inner diameter is measured.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder liner inner diameter measuring instrument for ships, etc., which easily measures the wear condition of cylinder liners of internal combustion engines, such as ships, without disassembling and removing the cylinder head.

0002

[Prior Art] In general, cylinder liners for internal combustion engines for ships, etc. require high output, so the inner diameter is approximately 40 mm.
Those with a large diameter of 0 mm are used, and one internal combustion engine has an average of 12 cylinders, that is, 12 cylinders. This cylinder liner is regularly replaced every 10,000 hours, but from the viewpoint of safety, periodic inspections are performed every 1,000 hours to measure its wear state. When the wear condition of the inner diameter reaches approximately 2.0 mm or more, the cylinder liner must be replaced with a new cylinder liner even if the usage time is less than 10,000 hours.

Conventionally, as shown in FIG. 6, the method for measuring the wear condition of a cylinder liner is to disassemble and remove the cylinder head of cylinder liner a, expose cylinder liner a, and then use an inside micrometer b.
After adjusting the zero point with a Moharing gauge, the cylinder liner is placed inside cylinder liner a and its inner diameter is measured.

0004

By the way, as mentioned above, in the conventional measuring method, after disassembling and removing the cylinder head of cylinder liner a and measuring its inner diameter,
Needs to be reassembled, one cylinder liner a
The inner diameter measurement work took a whole day. Furthermore, since one internal combustion engine is provided with an average of 12 cylinder liners a, it would take a total of 12 days to measure the inner diameters of all the cylinder liners a by simple calculation. Therefore, the time spent disassembling and reassembling the cylinder head is overwhelmingly longer than the time required to measure the inner diameter of the cylinder liner a, resulting in poor work efficiency.

The present invention was devised to effectively solve these problems, and its purpose is to easily measure the inner diameter of cylinder liners for ships, etc. It provides measuring instruments.

[0006]

[Means for Solving the Problems] To achieve the above object, the present invention provides a method for measuring the inner diameter of a cylinder liner of an internal combustion engine such as a ship by inserting the cylinder liner into the cylinder head of the cylinder liner and its axis. A cylinder liner inner diameter measuring instrument for internal combustion engines such as ships includes an outer cylinder that is inserted into the axis of the cylinder liner and has a slit formed in the length direction at its tip, and a pin at the insertion tip of the outer cylinder. a hollow arm that is coupled and rotated in the radial direction from within the outer cylinder and is housed within the outer cylinder through the slit; and a hollow arm that is provided within the outer cylinder and connected to the other end of the hollow arm. Also, a link mechanism for rotating the hollow arm in the radial direction from a state housed in the outer cylinder, and a measuring mechanism provided on the hollow arm and in contact with the inner surface of the cylinder liner to measure the inner diameter of the cylinder liner. It is equipped with a child.

[0007]

[Operation] Since the present invention is constructed as described above, in order to measure the inner diameter of the cylinder liner of an internal combustion engine, the hollow arm is housed in the outer cylinder through the slit, and the tip of the outer cylinder is moved from the cylinder head to the cylinder. After inserting into the liner and aligning it with the axis of the cylinder liner, the hollow arm is rotated in the radial direction from the outer cylinder by a link mechanism provided in the outer cylinder, and a measuring tip is attached to the tip of the hollow arm. This is achieved by contacting the inner surface of the cylinder liner and measuring it. Therefore, when measuring the inner diameter of the cylinder liner, there is no need for the troublesome work of separating and removing the cylinder head from the cylinder liner.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view showing an embodiment of measuring the inner diameter of a cylinder liner 2 of an internal combustion engine such as a ship using the cylinder liner inner diameter measuring device 1 of the present invention. As shown in the figure, this cylinder liner inner diameter measuring instrument 1 mainly includes an outer cylinder 5 that is inserted into a fuel injection hole 4 formed in the center of a cylinder head 3 of a cylinder liner 2, and an insertion tip of this outer cylinder 5. It is composed of a pair of hollow arms 6 provided in the hollow arms 6, a link mechanism 7 for rotating the hollow arms 6, and a measuring element 8 provided at the tip of the hollow arms 6.

[0010] This cylinder liner 2 has an inner diameter of 400 m.
It is formed into a cylindrical shape with a diameter of about m, and its upper part is covered with a cylinder head 3 to form a cylinder chamber 2a. A piston (not shown) reciprocates inside this at a speed of about 20 rpm. Further, a fuel injection hole 4 formed in the cylinder head 3 at the axial center position of the cylinder liner 2 is inserted into the cylinder chamber 2 by a fuel injection device (not shown).
It is for injecting fuel into the cylinder a, and is formed to vertically penetrate the cylinder head 3. Further, as shown in the figure, the lower part of the cylinder head 3 has a smaller diameter than the upper part, and the minimum diameter part 4a has an inner diameter of about 4
It is formed to have a thickness of 2 mm.

The outer cylinder 5 inserted into the fuel injection hole 4 is formed to have a length of about 2 m, and on both sides thereof there are three
Two positioning holes 5a, 5b, and 5c are formed. Further, the diameter of the outer cylinder 5 is set to such an extent that when inserted into the minimum diameter part 4a of the fuel injection hole 4, movement in the radial direction is restricted by the minimum diameter part 4a.

Further, the lower half of a guide bush 9 having a flange 9a is fitted into the upper part of the fuel injection hole 4 and is fixed to the cylinder head 3 with bolts 9b. As shown in FIG. 4, this guide bush 9 is formed into a cylindrical shape with an inner diameter that is the same as the minimum diameter portion 4a, and has a fuel injection hole 4.
It supports the outer cylinder 5 inserted into the fuel injection hole 4 and restricts the movement of the outer cylinder 5 in the radial direction above the fuel injection hole 4. That is, by restricting the radial movement of the outer cylinder 5 inserted into the fuel injection hole 4 at two points, the minimum diameter portion 4a at the bottom of the fuel injection hole 4 and this guide bush 9, the outer cylinder 5 is moved into the cylinder liner. It is precisely located at the center of the axis of the 2nd axis.

Further, a pair of positioning pins 10 are provided at the upper part of the flange 9a of the guide bush 9.
The tip thereof is adapted to fit into any one of three positioning holes 5a, 5b, and 5c formed on both sides of the outer cylinder 5 by screwing or spring force. These three positioning holes 5a, 5b, and 5c are arranged so that the tip of the outer cylinder 5 is, for example, 130 mm and 40 mm from the upper edge of the cylinder liner 2, respectively.
They are formed to be located at depths of 0 mm and 900 mm.

That is, the outer cylinder 5 inserted into the fuel injection hole 4 is accurately positioned at the axial center of the cylinder liner 2 by the minimum diameter portion 4a at the bottom of the fuel injection hole 4 and the guide bush 9 at the top. , the length of the guide bush 9 to be inserted into the cylinder liner 2 is set by the positioning pin 10 of the guide bush 9.

Next, as shown in FIG. 2, the hollow arms 6 provided at the insertion tip of the outer tube 5 are provided in pairs, and one end of each is connected with a pin inside the insertion tip of the outer tube 5. ing. Then, from inside the two slits 11 formed opposite to each other in the length direction of the insertion tip of the outer cylinder 5, as shown in FIG. It is supposed to be done. Further, the rotation of this hollow arm 6 is controlled by a link mechanism 7.

The link mechanism 7 is provided inside the outer cylinder 5 and extends along the inner cylinder 12 fixed inside the outer cylinder 5.
and a cylindrical slide part 13 that moves up and down in the length direction within the gap K of the inner cylinder 12, an extrusion rod 14 that is provided inside the gap K and moves this slide part 13 up and down, and a lower end of the slide part 13. and a connecting rod 15 connected to the tip of the hollow arm 6, as shown in FIG.
As shown in FIG. 3, by pushing down the push rod 14 and sliding the slide portion 13 toward the distal end of the outer cylinder 5, the connecting rod 15 rotates the distal end of the hollow arm 6 in the radial direction of the outer cylinder 5. It is designed to move. Further, in this slide portion 13, an upper slide member 13a and a lower slide member 13b are connected by two connecting pins 16, and the upper slide member 13a and the lower slide member 13b are connected by two connecting pins 16.
Coil springs 17 that are biased in an extending direction are provided between the two connecting pins 16 so as to surround the two connecting pins 16, respectively. Therefore, the pressing force of the push rod 14 is buffered by the coil spring 17 of the slide portion 13, which prevents the hollow arm 6 from rotating rapidly and allows the outer cylinder 5 to tilt 90 degrees in the radial direction. hollow arm 6
It is designed to be pressed down to prevent it from wobbling and causing measurement errors. Further, a rod-shaped measuring element (electronic micrometer) 18 is fitted and fixed at the tip of the hollow arm 6, and a telescopic measuring section 19 is provided at the tip. The measuring section 19 is adapted to come into contact with the inner wall surface of the cylinder liner 2 and measure the amount of wear thereof. Also, a leaf spring 2 is installed inside the tip of the inner cylinder 12.
0 is provided, and the hollow arm 6 housed in the slit 11 is biased so as to be pushed out in the radial direction from the inner cylinder slit 21 formed at the tip of the inner cylinder 12.

The push rod 14 extends above the outer cylinder 5, and its upper end is connected to a head slide member 18 that moves up and down within the upper end of the outer cylinder 5 along the inner cylinder 12, as shown in FIG. This head slide member 18
Two handles 22 are provided facing each other and extending in the radial direction of the outer cylinder 5. Further, as shown in the figure, two substantially L-shaped L slits 23 in which engaging portions 23a are formed are formed on the side surface of the outer cylinder 5, and the length thereof is determined by the movement of the head slide member 18. It is formed to have approximately the same length. Therefore, the handle 23 moves along the locus of the L slit 23 as shown by the arrow in the figure.

Next, the operation of the present invention will be explained with reference to the accompanying drawings.

First, a piston (not shown) sliding inside the cylinder liner 2 is positioned at the bottom dead center, and as shown in FIG. After removing the device (not shown) and releasing the fuel injection hole 4, the lower half of the guide bush 9 on which the flange 9a is formed is fitted into the fuel injection hole 4 and fixed to the cylinder head 3 with bolts 9b. do. Then, as shown in FIG. 2, with the hollow arm 6 housed in the slit 11 in the outer cylinder 5, the tip of the cylinder liner inner diameter measuring instrument 1 is inserted into the fuel injection hole 4, as shown in FIG. The positioning pin 10 of the guide bush 9 is inserted into the lowest positioning hole 5a formed on both sides of the outer cylinder 5.
to fix the cylinder liner inner diameter measuring device 1 to the axis of the cylinder liner 2. At this time, the insertion tip of the cylinder liner inner diameter measuring device 1 will be located at a depth of 130 mm from the upper edge of the cylinder liner 2.

Next, as shown in FIG. 6, after pushing the handle 22 down to the lower end of the L slit 23, it is rotated to the right and hooked onto the engaging portion 23a. As a result, the push rod 14 of the link mechanism 7 connected to the head slide member 18 is pushed down, and as shown in FIG.
3 is pushed down toward the insertion tip side of the outer cylinder 5, and the pair of hollow arms 6 housed in the slit 11 are each horizontally rotated 90 degrees to opposite sides in the radial direction of the outer cylinder 5 by means of the connecting rod 15.

Then, the measuring portion 19 of the measuring element (electronic micrometer) 18 provided at the tip of the hollow arm 6 comes into contact with the inner wall surface of the cylinder liner 2, measures the inner diameter of the cylinder liner 2, and measures the inner diameter of the cylinder liner 2. 1 from the top edge of
Measure the amount of wear at a depth of 30 mm. At this time, as mentioned above, since the hollow arm 6 is biased in the radial direction of the outer cylinder 5 by the leaf spring 20, the force of the connecting rod 15 is applied perpendicularly to the hollow arm 6 at the beginning of its rotation, causing the hollow arm 6 to Arm 6
It does not become difficult to rotate. In addition, since the hollow arm 6 that has been rotated 90 degrees horizontally is held down by the coil spring 17 of the slide portion 13, behavior such as rattling is suppressed, and the hollow arm 6 rattles and causes measurement errors. can be prevented from occurring. Furthermore, since the coil spring 17 also biases the push rod 14 in a direction that pushes it up, there is no risk that the handle 22 will be biased upward and come off the engagement portion 23a.

Next, after removing the positioning pin 10 of the guide bush 9 from the positioning hole 5a and further inserting the outer cylinder 5, the positioning pin 10 is fitted into the positioning hole 5b to measure the cylinder liner inner diameter. 1 was fixed at a position 400 mm from the upper edge of the cylinder liner 2, and the inner diameter was measured at a depth of 400 mm from the upper edge of the cylinder liner 2.
Measure the amount of wear at a depth of 0 mm. When the measurement of the inner diameter at a depth of 400 mm from the upper edge of the cylinder liner 2 was completed, the positioning pin 10 of the guide bush 9 was similarly removed from the positioning hole 5b, and the outer cylinder 5 was further inserted. After that, insert the positioning pin 10 into the positioning hole 5c.
The insertion tip of the cylinder liner inner diameter measuring instrument 1 is fixed at a position 900 mm from the upper edge of the cylinder liner 2, and the inner diameter thereof is measured.

Next, when all of the measurements as described above are completed, the cylinder liner inner diameter measuring device 1 is removed from the cylinder liner 2. That is, as shown in FIG.
Handle 2 engaged with engagement portion 23a of slit 23
2 to the left to release the engagement and pull it up above the outer cylinder 5, thereby pulling up the push rod 14 of the link mechanism 7 connected to the head slide member 18,
The slide part 13 is raised inside the outer cylinder 5, and the connecting rod 15
Accordingly, the hollow arm 6 is housed in the slit 11 of the outer cylinder 5. Then, the positioning pin 1 of the guide bush 9
This is achieved by removing the cylinder liner inner diameter measuring device 1 from the fuel injection hole 4 after removing the cylinder liner inner diameter measuring device 1 from the positioning hole 5c.

As a result of this measurement, if the wear condition of any one of the measured points on the cylinder liner 2 is 2.0 mm or more, the cylinder head 3 is disassembled and removed.
Cylinder liner 2 will be replaced with a new cylinder liner, but the wear condition at all of the measured points is 2.0.
If it is less than mm, it can be used as is, so reinstall the fuel injection device, etc. that was removed during the measurement. Then, the wear condition of the next cylinder liner is measured by the above-mentioned operation.

As described above in detail, the present invention makes it possible to measure the inner diameter of the cylinder liner 2 by using the fuel injection holes 4 formed in the cylinder head 3 of the cylinder liner 2, thereby eliminating the troublesome cylinder head. There is no need to perform the disassembly, removal, and reassembly work described in step 3.

In this embodiment, two hollow arms 6 are provided, but as shown in FIG. 7, three or more hollow arms 6 may be provided at equal intervals.

[0027]

[Effects of the Invention] In summary, according to the present invention, it is no longer necessary to perform the troublesome work of disassembling, removing, and reassembling the cylinder head of the cylinder liner, and the efficiency of measuring the inner diameter of the cylinder liner is dramatically improved. This has the excellent effect of making it possible to

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a state in which the tip of the cylinder liner inner diameter measuring device 1 of the present invention is inserted into a cylinder liner.

FIG. 3 is an enlarged sectional view showing a state in which the hollow arm is rotated in the radial direction of the outer cylinder from the state in FIG. 2;

FIG. 4 is an enlarged sectional view showing the vicinity of the guide bush.

FIG. 5 is an enlarged perspective view showing the vicinity of the handle of the cylinder liner inner diameter measuring device 1 of the present invention.

FIG. 6 is a bottom view showing a modified embodiment of the present invention.

FIG. 7 is a schematic diagram showing a conventional cylinder liner measurement method.

[Explanation of symbols]

1　Cylinder liner inner diameter measuring device 2 Cylinder liner 3 Cylinder head 5 Outer cylinder 6 Hollow arm 7 Link mechanism 11 Slit 18 Measuring head

Claims (1)

[Claims] 1. A cylinder liner inner diameter measuring instrument for an internal combustion engine such as a ship, which is inserted into the axis of the cylinder liner from the cylinder head of the cylinder liner of the internal combustion engine such as a ship to measure the inner diameter of the cylinder liner. An outer cylinder that is inserted into the axis of the liner and has a slit formed in the length direction at its tip, and a pin is connected to the insertion tip of the outer cylinder so that it can be rotated in the radial direction from inside the outer cylinder. , a hollow arm accommodated in the outer cylinder through the slit;
a link mechanism provided in the outer cylinder, connected to the other end of the hollow arm, and for rotating the hollow arm in the radial direction from a state housed in the outer cylinder; and a link mechanism provided at the tip of the hollow arm. A measuring device for measuring the inner diameter of a cylinder liner for an internal combustion engine such as a ship, characterized in that the probe is provided at the tip of the hollow arm and is in contact with the inner surface of the cylinder liner to measure the inner diameter of the cylinder liner. .