JP2007248303A - Bore measurement instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a cost so as to set a lubricant to a necessary proper amount by simply and accurately measuring bores even in large scaled measurement such as cylinder bore measurement of marine large sized diesel engines. <P>SOLUTION: A bore measurement instrument includes: a substrate 20 arranged along the center line of a cylinder S in a measurement state; a position holding part 30 having at least three holding arms 35 extended radially so as to be contacted on the inner wall face of the cylinder S from the substrate 20; and a measurement part 40 having displacement sensors on the edge of a measurement arm 45 extended radially from the substrate 20. The holding arm 35 and the measurement arm 45 are extended when being inserted in the cylinder S of a diesel engine E, and a whole is inserted in the cylinder S from an insertion opening H of a small bore from a bore B. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bore measuring device for measuring the inner diameter of a key point by inserting it into a cylinder of a diesel engine.

  The bore measuring apparatus according to the present invention has been developed mainly for the purpose of measuring the cylinder inner diameter of a marine large diesel engine. A method for measuring the inner diameter of a cylinder, which is performed at home and abroad, is generally one in which a person enters the cylinder and measures with a rod-shaped micrometer called a bore gauge. It is desirable that the measurement work be performed while the cylinder does not cool down.Lubricant is attached to the inner wall of the cylinder, which is a very poor measurement environment where accuracy is required. Were different, had unexplained results, and had problems with their reliability.

  As a conventional technique related to bore measurement, for example, there is a technique disclosed in Patent Document 1. That is, in this patent document, a probe unit is inserted into a cylinder through a plug hole, a probe piece that can be extended only on one side is expanded until it contacts the inner wall surface of the cylinder, and the diameter is measured. Discloses a method of measuring a target cylinder bore by reproducing.

JP 2003-194506 A

  However, such a conventional technique makes it possible to measure the inside diameter of the cylinder from a small plug hole, but it requires a process of reproduction, and the measurement is complicated, and the inside diameter of the bore of the cylinder is directly measured. There was a problem that it was not possible and it was difficult to increase the size.

  Also, in the case of a large diesel engine, lubricating oil called cylinder oil is always infused on the contact surface between the cylinder inner wall and the piston ring. Accounted for.

  Therefore, it is desired to reduce the cost by saving this, but if the amount of lubrication is reduced too much, the wear of the cylinder inner wall is naturally accelerated. For this reason, it is the present situation that every operating company lubricates more or less, and it is desired to reduce the cost by using an appropriate amount of lubrication.

  The present invention has been made paying attention to such problems of the conventional technology, and it is possible to easily and accurately measure the inner diameter even for large-scale measurements such as cylinder inner diameter measurement of a large marine diesel engine. Therefore, an object of the present invention is to provide a bore measuring apparatus that can reduce the cost by setting the required amount of lubricating oil.

The gist of the present invention for achieving the object lies in the inventions of the following items.
[1] A bore measuring device (10) for inserting into a cylinder (S) of a diesel engine (E) and measuring an inner diameter of a key point,
A base body (20) disposed along the center line of the cylinder (S) in the measurement state, and at least three holding arms extending radially from the base body (20) so as to contact the inner wall surface of the cylinder (S) (35, 35...) And a measurement unit (40) having a displacement sensor (50) at the tip of a measurement arm (45, 45) extending radially from the base body (20). And
When the diesel engine (E) is inserted into the cylinder (S), the holding arm (35, 35...) And the measurement arm (45, 45) are contracted to have an insertion port (H) having a smaller diameter than the bore (B). A bore measuring device (10) characterized in that the whole can be inserted into the cylinder (S).

[2] A bore measuring device (10) for inserting into a cylinder (S) of a diesel engine (E) to measure an inner diameter of a key point,
A base body (20) disposed along the center line of the cylinder (S) in the measurement state, and at least three holding arms extending radially from the base body (20) so as to contact the inner wall surface of the cylinder (S) (35, 35...) And a measurement unit (40) having a displacement sensor (50) at the tip of a measurement arm (45, 45) extending radially from the base body (20). And
In the position holding portion (30, 30), the holding arm (35, 35...) Extends from a holding base (31) fixed to the base body (20), and the holding arm (35, 35...). Can expand and contract like a bellows
In the measurement unit (40), the measurement arm (45, 45) is extended to a measurement base (41) fixed to the base (20), and the measurement arm (45, 45) is in a measurement state. The displacement sensor (50) is provided in contact with the inner wall surface of the cylinder (S),
When the diesel engine (E) is inserted into the cylinder (S), the holding arm (35, 35...) And the measurement arm (45, 45) are contracted to have an insertion port (H) having a smaller diameter than the bore (B). A bore measuring device (10) characterized in that the whole is inserted into the cylinder (S) and the holding arms (35, 35...) And the measuring arms (45, 45) are extended after the insertion to enable measurement. .

[3] A bore measuring device (10) for inserting into a cylinder (S) of a diesel engine (E) and measuring an inner diameter of a key point,
A base body (20) disposed along the center line of the cylinder (S) in the measurement state, and at least three holding arms extending radially from the base body (20) so as to contact the inner wall surface of the cylinder (S) (35, 35...) And a measurement unit (40) having a displacement sensor (50) at the tip of a measurement arm (45, 45) extending radially from the base body (20). And
The position holding portions (30, 30) are provided at the upper end portion and the lower end portion of the base body (20), respectively, and the holding arms (35, 35) are attached to a holding base portion (31) fixed to the base body (20). ...) is extended, and the holding arms (35, 35 ...) can be expanded and contracted in a bellows shape,
The measurement unit (40) is disposed between the position holding units (30, 30) provided at the upper end and the lower end of the base (20), and is fixed to the base (20). The measurement arm (45, 45) is extended to the measurement base (41), and the measurement sensor (45, 45) is in a measurement state so that the displacement sensor (50) contacts the inner wall surface of the cylinder (S). Provided,
When the diesel engine (E) is inserted into the cylinder (S), the holding arm (35, 35...) And the measurement arm (45, 45) are contracted to have an insertion port (H) having a smaller diameter than the bore (B). A bore measuring device (10) characterized in that the whole is inserted into the cylinder (S) and the holding arms (35, 35...) And the measuring arms (45, 45) are extended after the insertion to enable measurement. .

[4] A bore measuring device (10) for inserting into a cylinder (S) of a diesel engine (E) to measure an inner diameter of a key point,
A base body (20) disposed along the center line of the cylinder (S) in the measurement state, and at least three holding arms extending radially from the base body (20) so as to contact the inner wall surface of the cylinder (S) (35, 35...) And a measurement unit (40) having a displacement sensor (50) at the tip of a measurement arm (45, 45) extending radially from the base body (20). And
The position holding portions (30, 30) are provided at the upper end portion and the lower end portion of the base body (20), respectively, and the holding arms (35, 35) are attached to a holding base portion (31) fixed to the base body (20). ...) is extended, and the holding arms (35, 35 ...) can be expanded and contracted in an accordion shape by air pressure by means of intermediate cylinders (35a, 35b) which are gradually inserted into each other,
The measurement unit (40) is disposed between the position holding units (30, 30) provided at the upper end and the lower end of the base (20), and is fixed to the base (20). The measurement arm (45, 45) is extended to the measurement base (41), and the measurement arm (45, 45) is supported by the measurement base (41) so as to be able to rise and fall. S) is provided so that the displacement sensor (50) contacts the inner wall surface of
When the diesel engine (E) is inserted into the cylinder (S), the holding arm (35, 35...) And the measurement arm (45, 45) are contracted to have an insertion port (H) having a smaller diameter than the bore (B). A bore measuring device (10) characterized in that the whole is inserted into the cylinder (S) and the holding arms (35, 35...) And the measuring arms (45, 45) are extended after the insertion to enable measurement. .

[5] A bore measuring device (10) for inserting into a cylinder (S) of a diesel engine (E) and measuring an inner diameter of a key point,
A base body (20) disposed along the center line of the cylinder (S) in the measurement state, and at least three holding arms extending radially from the base body (20) so as to contact the inner wall surface of the cylinder (S) (35, 35...) And a measurement unit (40) having a displacement sensor (50) at the tip of a measurement arm (45, 45) extending radially from the base body (20). And
The position holding portions (30, 30) are provided at the upper end portion and the lower end portion of the base body (20), respectively, and the holding arms (35, 35) are attached to a holding base portion (31) fixed to the base body (20). ...) is extended, and the holding arms (35, 35 ...) can be expanded and contracted in an accordion shape by air pressure by means of intermediate cylinders (35a, 35b) which are gradually inserted into each other,
The measurement unit (40) is disposed between the position holding units (30, 30) provided at the upper end and the lower end of the base (20), and is fixed to the base (20). The measurement arm (45, 45) is extended to the measurement base (41), and the measurement arm (45, 45) is supported by the measurement base (41) so as to be able to rise and fall. S) is provided so that the displacement sensor (50) contacts the inner wall surface of
A screw shaft (46) that is screwed into the measurement unit (40) is installed between the upper and lower position holding units (30, 30) provided at the upper end and the lower end of the base body (20), By rotating the screw shaft (46), the measuring unit (40) can be moved,
When the diesel engine (E) is inserted into the cylinder (S), the holding arm (35, 35...) And the measurement arm (45, 45) are contracted to have an insertion port (H) having a smaller diameter than the bore (B). Further, the whole is inserted into the cylinder (S), and after the insertion, the holding arm (35, 35...) And the measuring arm (45, 45) are stretched and measured, and the measuring unit (40) is moved. A bore measuring device (10) characterized in that measurement is possible.

  [6] In the measurement unit (40), a pneumatic cylinder (43) for raising and lowering the measurement arm (45, 45) is mounted between the measurement base (41) and the measurement arm (45, 45). The measurement arm (45, 45) is erected by the pneumatic cylinder (43) in the measurement state, and the displacement sensor (50) is provided so as to contact the inner wall surface of the cylinder (S). The bore measuring device (10) according to [4] or [5].

  [7] A contact (37) is provided at the tip of the holding arm (35, 35...) Of the position holding portion (30, 30) via a buffer spring (36) [1. ] The bore measuring device (10) according to [4] or [5].

The present invention operates as follows.
The bore measuring device (10) according to the present invention is inserted into a cylinder (S) of a diesel engine (E) to measure the inner diameter of a key point, and is a relatively large marine diesel engine (E And is inserted into the cylinder (S) at the time of measurement, and measurement work is performed.

  When the diesel engine (E) is inserted into the cylinder (S), the holding arm (35, 35...) And the measurement arm (45, 45) are reduced in size to be smaller and smaller in diameter than the bore (B) of the cylinder (S). The bore measuring device (10) in a state of being contracted and folded into the cylinder (S) from the insertion port (H) is inserted through the hole in the upper part of the cylinder (S). Actually hang it with a winch.

  Usually, an insertion port (H) having a smaller diameter than that of the cylinder (S) after removing the exhaust valve block (K) that can be easily removed is used. As a result, the measurement operation can be easily performed without removing the entire cylinder cover (C), which is a tough operation, or requiring restoration.

  Therefore, the measurement unit can be inserted from the hole of the exhaust valve block (K) without removing the cylinder cover (C), and after inserting the measurement unit in the contracted state, the necessary parts are expanded by air pressure so that measurement is possible. Is possible.

  That is, when the diesel engine (E) is inserted into the cylinder (S), the holding arm (35, 35...) And the measurement arm (45, 45) are contracted to have a smaller diameter insertion port (H) than the bore (B). Further, the whole can be inserted into the cylinder (S), and after the insertion, the holding arm (35, 35...) And the measuring arm (45, 45) can be extended and measured.

  In the measurement state, the holding arms (35, 35...) Of the position holding unit (30, 30) are radially extended from the base body (20) so that the tip end comes into contact with the inner wall surface of the cylinder (S). ) Is in a posture along the center line at the substantially central portion of the cylinder (S), and the position of the bore measuring device (10) is determined.

  When the holding arms (35, 35,...) Are configured by intermediate cylinders (35a, 35b) that are inserted into each other and are gradually narrowed, they can be expanded and contracted in a bellows shape by air pressure. .

  In the case where the position holding portions (30, 30) are respectively provided at the upper end portion and the lower end portion of the base body (20), the holding arm (35) from the holding base portion (31) fixed to the base body (20) vertically. , 35... Extend in a bellows shape, and the tip end abuts against the inner wall surface of the cylinder (S), so that a stable posture is maintained.

  In the measuring section (40), the measuring arms (45, 45) are extended from the measuring base (41) fixed to the base body (20), and the displacement sensor (50) is placed on the inner wall surface of the cylinder (S). The bore (B), which is in contact with the cylinder (S), is measured.

  Even if the base body (20) is slightly deviated from the center of the cylinder (S), if the sensor data is added and used as measurement data, the measurement error can be minimized. In the embodiment, it has been confirmed that the inclination of the substrate (20) does not structurally exceed 0.3 degrees, and the measurement error in this case is within 10 microns at the worst.

  A screw shaft (46) that is screwed into the measurement unit (40) is installed between the upper and lower position holding units (30, 30) provided at the upper end and the lower end of the base (20). By rotating the screw shaft (46), the measuring unit (40) can be moved, and measurement can be performed by changing the position within the moving range.

  In the measurement unit (40), a pneumatic cylinder (43) for raising and lowering the measurement arm (45, 45) is mounted between the measurement base (41) and the measurement arm (45, 45). In the measurement, the measurement arm (45, 45) is erected by the pneumatic cylinder (43) in the measurement state, and the displacement sensor (50) contacts the inner wall surface of the cylinder (S).

  Further, in the case where the contact (37) is provided at the tip of the holding arm (35, 35...) Of the position holding portion (30, 30) via the buffer spring (36), the contact spring (36) is surely secured. The tip of the holding arm (35, 35...) Contacts the inner wall surface of the cylinder (S).

  The movement of the displacement sensor (50) by rotating the screw shaft (46) can be controlled by a monitor, and the position (depth) can also be known by a measure mounted on the mount. The monitor calculates the cylinder (S) inner diameter from the sensor data and displays it on the liquid crystal display in real time.

  The cylinder (S) number, position (depth), and sensor head direction (angle) are input from the keyboard, and the confirmation key is pressed to measure once. A total of about 80 measurements are performed with one cylinder (S). In addition, by connecting a monitor to a personal computer, all measurement data can be transferred and stored, enabling more precise data management than before.

  When the measurement is completed, the holding arm (35, 35...) And the measurement arm (45, 45) are contracted or reduced by being sucked in reverse, and the bore measuring device (10 ) Can be easily carried out from the cylinder (S) to the outside.

  According to the bore measuring device according to the present invention, it is possible to measure the inner diameter of the cylinder of the engine without requiring a large-scale disassembly work, the measurement operation is easy, does not take man-hours, and the positioning is easy. Accurate measurement results can be obtained.

  If the cylinder inner diameter is measured with high accuracy and the change over time can be accurately grasped, the optimum amount of cylinder oil can be determined, and unnecessary cost can be eliminated, thereby reducing costs. For example, the cost of cylinder oil, which costs about 200,000 yen per day with a 50,000 horsepower engine, can be considerably reduced.

  Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

Each figure shows one embodiment of the present invention.
The measurement target is a diesel engine E as shown in FIG. In the diesel engine E, a cylinder S in which a piston P moves is formed in a cylinder liner L, a cylinder cover C is provided in an upper part, and an exhaust valve block K for supporting a valve V for exhaust is fixed thereon. ing.

  The bore measuring device 10 is inserted into the cylinder S of the diesel engine E and measures a bore B which is an inner diameter of a key point. When the exhaust valve block K is removed as shown in FIG. An insertion port H having a smaller diameter than B is opened. In FIG. 7 which is an explanatory view, the bore measuring device 10 in a folded state is inserted from the insertion port H above the cylinder S as shown in the upper part of the bore B. B is measured.

  As described above, the exhaust valve block K is mounted on the insertion port H, but can be easily removed. Removing the entire cylinder cover C is an extremely difficult task, and it is not easy to recover. However, the winch W is attached to the suspension ring R from the insertion port H after the exhaust valve block K is removed without removing the cylinder cover C. As shown in the lower part of the bore B in FIG. 7, after the bore measuring device 10 is inserted in the contracted state, the bore measuring device 10 can be inserted while being hung and hung. Thus, it is possible to expand the necessary part and make it ready for measurement.

  As shown in FIG. 1 to FIG. 3, the bore measuring device 10 extends in a radial manner so that the base 20 disposed along the center line of the cylinder S in the measurement state and the base 20 contacts the inner wall surface of the cylinder S. The upper and lower position holding units 30, 30 having at least three holding arms 35, 35... And the measurement unit 40 having the displacement sensor 50 at the tip of the measurement arms 45, 45 extending radially from the base body 20. Become.

  The position holding portions 30 and 30 are respectively provided at the upper end portion and the lower end portion of the base body 20, and holding arms 35, 35... Extend from a holding base portion 31 fixed to the base body 20. The holding arm 35 can be extended in a bellows shape by air pressure by the intermediate cylinders 35a and 35b which are gradually inserted into each other, and is contracted when the air pressure is released by a spring (not shown).

  A contact 37 is provided at the tip of the holding arm 35, 35... Of the position holding unit 30, 30 via a buffer spring 36, and a contact roller 37a is mounted on the contact 37 so as to be idle.

  The measuring unit 40 is disposed between both position holding units 30 and 30 provided at the upper end and the lower end of the base 20, and measurement arms 45 and 45 are extended from a measurement base 41 fixed to the base 20. The measurement arms 45 and 45 are supported by the measurement base 41 so as to be able to rise and fall by the support shaft 42, and are provided so that the displacement sensor 50 comes into contact with the inner wall surface of the cylinder S in the measurement state.

  A pneumatic cylinder 43 for raising and lowering the measurement arm 45 is mounted between the measurement base 41 and the measurement arm 45, and when the pneumatic cylinder 43 is pressurized in the measurement state, the measurement arm 45 stands up and is placed on the inner wall surface of the cylinder S. A displacement sensor 50 is provided to contact. Further, when the air pressure is released, the measurement arm 45 is tilted by a spring (not shown).

  In the displacement sensor 50, a measuring element 53 is provided at the tip of the sensor body 51 via an urging spring 52, and a contact roller 54 is provided at the tip of the measuring element 53. The sensor body 51 is a differential transformer, for example.

  A storage box 21 is provided above the base 20, and a pneumatic inlet 22, a power connector 23, a sensor signal connector 23 a, and a sensor solenoid valve 24 are provided. The air pressure introduction port 22 is connected to the air pressure cylinder 43 of the measuring unit 40 by the air connection pipe 26 through the sensor electromagnetic valve 24 inside the storage box 21, and is positioned through the inside of the base body 20 through the holding unit electromagnetic valve 25. It is connected to intermediate cylinders 35 a and 35 b of the holding arm 35 of the holding unit 30.

  A screw shaft 46 that is screwed into the measurement base 41 of the measurement unit 40 is installed between the upper and lower position holding units 30 and 30 provided at the upper end and the lower end of the base 20, and the screw shaft 46 is rotationally driven. Thus, the measuring unit 40 is movable.

  In other words, the screw shaft 46 is pivotally supported by the holding base portion 31 of the lower position holding portion 30 so as to be idled, and is screwed into the nut member 47 to the measurement base portion 41 of the measuring portion 40. An electric motor 27 is disposed in the storage box 21 of the base body 20, and the output of the electric motor 27 is connected to gears 48, 48 fixed to the upper end portion of the screw shaft 46 via transmission belts 27a, 27a. Yes.

  With the above-described configuration, the bore measuring device 10 reduces the length of the holding arms 35, 35... And the measuring arms 45, 45 when the diesel engine E is inserted into the cylinder S, and enters the cylinder S from the insertion port H having a smaller diameter than the bore B. Are inserted, the holding arms 35, 35... And the measurement arms 45, 45 are extended and measured, and the measurement unit 40 can be measured at the moved position.

Next, the operation will be described.
A bore measuring device 10 according to the present invention is for inserting into a cylinder S of a diesel engine E to measure the inner diameter of a key point, and is suitable for a relatively large marine diesel engine E, During the measurement, the measurement work is performed by inserting the cylinder S.

  When the diesel engine E is inserted into the cylinder S, the pressure is reduced from the air pressure inlet 22 via the sensor solenoid valve 24 and the holder solenoid valve 25, and as shown in the upper part of FIGS. The holding arms 35, 35... And the measuring arms 45, 45 are contracted to be small. The bore measuring device 10 in a state of being contracted and folded into the cylinder S from the insertion port H having a diameter smaller than that of the bore B of the cylinder S is inserted from a hole in the upper part of the cylinder S.

  The hook F of the winch W is hooked on the suspension ring R and suspended, and the bore measuring device 10 is inserted into the insertion port H while moving downward. After the bore measuring device 10 is inserted in the contracted state, as shown at the bottom of the bore B in FIGS.

  Thus, by using the insertion port H having a smaller diameter than the cylinder S after removing the exhaust valve block K that can be easily removed, the entire cylinder cover C, which is a tough work, can be removed or restored. The measurement work can be easily performed without the need.

  More specifically, when the diesel engine E is inserted into the cylinder S, the air pressure of the air connection pipe 26 is released from the sensor solenoid valve 24, and the holding portion solenoid valve 25 is moved to the inside of the holding arm 35 of the position holding portion 30. Remove air pressure. As a result, the holding arms 35, 35... And the measuring arms 45, 45 are contracted so that the whole can be inserted into the cylinder S from the insertion port H having a smaller diameter than the bore B. After the insertion, air pressure is applied from the sensor solenoid valve 24 to the air connection pipe 26, and the air pressure is also introduced into the inside of the holding arm 35 of the position holding portion 30 from the holding portion electromagnetic valve 25, thereby holding arms 35, 35. In addition, the measurement arms 45, 45 can be extended and measured.

  In the measurement state, the bellows-shaped intermediate cylinders 35a, 35b of the holding arms 35, 35... Of the position holding parts 30, 30 are radially extended from the base body 20 so that the tip end abuts against the inner wall surface of the cylinder S. However, the position of the bore measuring device 10 is determined in a posture along the center line at the substantially central portion of the cylinder S.

  Since the position holding portions 30, 30 are respectively provided at the upper end portion and the lower end portion of the base 20, the holding arms 35, 35... Extend from the holding base 31 fixed to the base 20 up and down in a bellows shape. The contact 37 and the contact roller 37a at the front end abut against the inner wall surface of S, and the buffer spring 36 buffers a position error and maintains a stable posture.

  The measuring unit 40 extends from a measuring base 41 fixed to the base body 20, and enters a measuring state while the contact rollers 54 of the probe 53 of the displacement sensor 50 are urged by the urging spring 52. The bore B which is in contact with the inner wall surface of S and is the inner diameter of the cylinder S is measured.

  Deviation from the center of the substrate 20 is not a problem. Even if the base 20 is slightly deviated from the center of the cylinder S, if the sensor data is added and used as measurement data, the measurement error can be minimized. In the embodiment, it is confirmed that the inclination of the substrate 20 is structurally not more than 0.3 degrees, and the measurement error in this case is within 10 microns at the worst.

  A screw shaft 46 that is screwed into the measurement unit 40 is installed between the upper and lower position holding units 30 and 30 provided at the upper end and the lower end of the base body 20, and the screw shaft 46 is driven to rotate. Thus, the measuring unit 40 can be moved, and measurement can be performed while changing the position within the moving range.

  Movement of the displacement sensor 50 by rotationally driving the screw shaft 46 can be controlled by a monitor, and the position (depth) can also be known by a measure mounted on the mount. The monitor calculates the inner diameter of the cylinder S from the sensor data and displays it on the liquid crystal display in real time.

  The cylinder S number, position (depth), and sensor head direction (angle) are input from the keyboard, and the confirmation key is pressed to measure once. A single cylinder S measures about 80 times in total. In addition, by connecting a monitor to a personal computer, all measurement data can be transferred and stored, enabling more precise data management than before.

  When the measurement is completed, the air pressure of the air connection pipe 26 is reduced from the sensor electromagnetic valve 24, and the air pressure from the holding part electromagnetic valve 25 to the inside of the holding arm 35 of the position holding part 30 is also reduced. When the pressure is reduced and the air pressure disappears, the holding arms 35, 35... And the measurement arms 45, 45 are shortened or folded by a spring (not shown), and it becomes easy to lift the bore measuring device 10 that has become smaller. The cylinder S can be carried out from the inside.

  In the above-described embodiment, the measurement arm is folded. However, it goes without saying that the measurement arm may be configured to be linearly expanded and contracted to be in a measurement state.

It is a longitudinal section showing a bore measuring device concerning one embodiment of the present invention. It is a perspective view of the measurement state which shows the bore measuring device concerning one embodiment of the present invention. It is a longitudinal cross-sectional view which shows the air system of the bore measuring device which concerns on one embodiment of this invention. It is a top view which shows the measurement part of the bore measuring device which concerns on one embodiment of this invention. It is a front view which shows the measurement part of the bore measuring device which concerns on one embodiment of this invention. It is a perspective view of the contraction state which shows the bore measuring device concerning one embodiment of the present invention. It is explanatory drawing which shows measurement operation of the bore measuring device which concerns on one embodiment of this invention. It is a longitudinal cross-sectional view which shows an example of the diesel engine which is a measuring object by the bore measuring device which concerns on one embodiment of this invention.

Explanation of symbols

B ... Bore C ... Cylinder cover E ... Diesel engine F ... Hook H ... Insertion port K ... Exhaust valve block L ... Cylinder liner P ... Piston R ... Hanging ring S ... Cylinder V ... Valve W ... Winch 10 ... Bore measuring device 20 ... Substrate 21 ... Storage box 22 ... Pneumatic inlet 23 ... Power connector 23a ... Sensor signal connector 24 ... Sensor solenoid valve 25 ... Holding solenoid valve 26 ... Air connection pipe 27 ... Electric motor 27a ... Transmission belt 30 ... Position Holding part 31 ... Holding base 35 ... Holding arm 35a, 35b ... Intermediate cylinder 36 ... Buffer spring 37 ... Contact 37a ... Contact roller 40 ... Measuring part 41 ... Measuring base 42 ... Supporting shaft 43 ... Pneumatic cylinder 45 ... Measuring arm 46 ... Screw shaft 47 ... Nut member 48 ... Gear 50 ... Displacement sensor 51 ... Sensor body 52 ... Biasing spring 53 The feeler 54 ... contact roller

Claims (7)

A bore measuring device for inserting into a cylinder of a diesel engine and measuring the inner diameter of a key point,
A base disposed along the center line of the cylinder in the measurement state, a position holding portion having at least three holding arms extending radially from the base so as to contact the inner wall surface of the cylinder, and radially from the base A measurement unit having a displacement sensor at the end of the extended measurement arm;
A bore measuring device characterized in that, when the diesel engine is inserted into a cylinder, the at least three holding arms and the measuring arm are contracted so that the whole can be inserted into the cylinder through an insertion port having a smaller diameter than the bore. A bore measuring device for inserting into a cylinder of a diesel engine and measuring the inner diameter of a key point,
A base disposed along the center line of the cylinder in the measurement state, a position holding portion having at least three holding arms extending radially from the base so as to contact the inner wall surface of the cylinder, and radially from the base A measurement unit having a displacement sensor at the end of the extended measurement arm;
The position holding portion has the holding arm extended to a holding base fixed to the base, and the holding arm can be expanded and contracted in a bellows shape.
The measurement unit includes the measurement arm extended to a measurement base fixed to the base, and the measurement arm is provided so that the displacement sensor contacts an inner wall surface of a cylinder in a measurement state.
When inserting a diesel engine into a cylinder, the holding arm and measurement arm can be shortened to insert the whole into the cylinder through the insertion port having a smaller diameter than the bore, and after the insertion, the holding arm and measurement arm can be extended for measurement. A bore measuring device characterized by that. A bore measuring device for inserting into a cylinder of a diesel engine and measuring the inner diameter of a key point,
A base disposed along the center line of the cylinder in the measurement state, a position holding portion having at least three holding arms extending radially from the base so as to contact the inner wall surface of the cylinder, and radially from the base A measurement unit having a displacement sensor at the end of the extended measurement arm;
The position holding portion is provided at each of an upper end portion and a lower end portion of the base body, the holding arm is extended to a holding base portion fixed to the base body, and the holding arm can extend and contract in a bellows shape,
The measurement unit is disposed between the position holding units provided at the upper end and the lower end of the base, and the measurement arm is extended to a measurement base fixed to the base. Is provided so that the displacement sensor contacts the inner wall surface of the cylinder in the measurement state,
When inserting a diesel engine into a cylinder, the holding arm and measurement arm can be shortened to insert the whole into the cylinder through the insertion port having a smaller diameter than the bore, and after the insertion, the holding arm and measurement arm can be extended for measurement. A bore measuring device characterized by that. A bore measuring device for inserting into a cylinder of a diesel engine and measuring the inner diameter of a key point,
A base disposed along the center line of the cylinder in the measurement state, a position holding portion having at least three holding arms extending radially from the base so as to contact the inner wall surface of the cylinder, and radially from the base A measurement unit having a displacement sensor at the end of the extended measurement arm;
The position holding portions are respectively provided at an upper end portion and a lower end portion of the base body, the holding arms are extended to a holding base portion fixed to the base body, and the holding arms are gradually inserted into each other. It can be expanded and contracted in a bellows shape by air pressure with a cylinder,
The measurement unit is disposed between the position holding units provided at the upper end and the lower end of the base, and the measurement arm is extended to a measurement base fixed to the base. Is supported by the measurement base so as to be able to rise and fall, and is provided so as to stand up in the measurement state so that the displacement sensor contacts the inner wall surface of the cylinder.
When inserting a diesel engine into a cylinder, the holding arm and measurement arm can be shortened to insert the whole into the cylinder through the insertion port having a smaller diameter than the bore, and after the insertion, the holding arm and measurement arm can be extended for measurement. A bore measuring device characterized by that. A bore measuring device for inserting into a cylinder of a diesel engine and measuring the inner diameter of a key point,
A base disposed along the center line of the cylinder in the measurement state, a position holding portion having at least three holding arms extending radially from the base so as to contact the inner wall surface of the cylinder, and radially from the base A measurement unit having a displacement sensor at the end of the extended measurement arm;
The position holding portions are respectively provided at an upper end portion and a lower end portion of the base body, the holding arms are extended to a holding base portion fixed to the base body, and the holding arms are gradually inserted into each other. It can be expanded and contracted in a bellows shape by air pressure with a cylinder,
The measurement unit is disposed between the position holding units provided at the upper end and the lower end of the base, and the measurement arm is extended to a measurement base fixed to the base. Is supported by the measurement base so as to be able to rise and fall, and is provided so as to stand up in the measurement state so that the displacement sensor contacts the inner wall surface of the cylinder.
A screw shaft that is screwed into the measurement portion is installed between the upper and lower position holding portions provided at the upper end portion and the lower end portion of the base, and the measurement portion is moved by rotationally driving the screw shaft. Enable
When the diesel engine is inserted into the cylinder, the holding arm and the measuring arm are contracted to insert the whole into the cylinder through the insertion port having a smaller diameter than the bore, and after the insertion, the holding arm and the measuring arm are extended and measured. In addition, a bore measuring apparatus capable of measuring at the position where the measuring unit is moved.   In the measurement unit, a pneumatic cylinder for raising and lowering the measurement arm is mounted between the measurement base and the measurement arm. In the measurement state, the measurement arm is erected by the pneumatic cylinder on the inner wall surface of the cylinder. The bore measuring device according to claim 4 or 5, wherein a displacement sensor is provided so as to contact.   The bore measuring device according to claim 1, wherein a contact is provided at a tip of a holding arm of the position holding unit via a buffer spring.

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