Fastening force measuring device and fastening force measuring method

Abstract

The invention provides a fastening force measuring device and a fastening force measuring method, which can easily and accurately detect the fastening state of a split body forming a joint body such as a connecting rod. The fastening force measuring device (1) measures the fastening force of a first split body and a second split body, such as a cover part (116) and a rod main body part (115), which constitute a joined body such as a connecting rod (110), by a fastening member such as a bolt (118), and is provided with: a first terminal part (3) which is in contact with a conductive first part to be measured; a second terminal part (4) which is in contact with a conductive second part to be measured which is connected to the first part to be measured; a positioning section (5) that is positioned on the joined body such that the first terminal section (3) and the second terminal section (4) are in contact with the first section to be measured and the second section to be measured, respectively; and a measuring unit (6) that measures the fastening force on the basis of the currents of the first and second parts to be measured.

Description

Technical Field

[0001] The present invention relates to a fastening force measuring device and a fastening force measuring method for measuring the fastening force of split bodies constituting a joint body such as a connecting rod of an engine. Background Art

[0002] In the past, sometimes the piston was removed from the engine for maintenance. For large engines such as those used for ships and land power generation, in order to pull the piston out from the upper part of the cylinder while it is connected to the connecting rod, it is necessary to disconnect multiple connecting rods and the crankshaft. In addition, after the maintenance is completed, when the piston and the connecting rod are assembled to the engine, the connecting rod and the crankshaft need to be connected. Specifically, when the connecting rod is divided into a rod body and a cover at the large end, it is necessary to tighten the rod body and the cover while the crankshaft is connected to the connecting hole formed between the rod body and the cover.

[0003] For example, in Patent Document 1, regarding a method for tightening a cover bolt of a connecting rod, an engine comprises: a connecting rod, which is divided into two parts, a rod and a cover, at a crank pin portion and at a surface that is perpendicular to a center line, and the cover is fastened to the rod by means of a cover bolt; and an inspection window, which is provided at a lower side portion of a cylinder body, and for this engine, four cover bolts are provided for each connecting rod, and a blocking wrench is inserted through the inspection window to perform assembly and disassembly of the cover bolts.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 6-262537 Summary of the invention

[0007] During maintenance of a large engine, an operator inserts a tool through an inspection window formed on the side of the engine (cylinder block) and manually fastens and connects multiple connecting rods. However, due to the size of the engine, the inspection window is sometimes not large enough for the operator to check the working position of the connecting rod.

[0008] Therefore, it is not easy to accurately confirm the tightness of all the bolts of the connecting rod during maintenance, and when the tightness of the bolts is managed by parameters such as tightening torque and angle, it may not be accurately managed. For example, even when the tightening torque is managed, if dirt is sandwiched between the split bodies constituting the connecting rod, the split bodies may not be properly connected to each other even if the tightening torque value is appropriate. In addition, when "forgetting to tighten the bolts" (including insufficient tightening force) may occur due to human error, the tightness of the bolts cannot be accurately confirmed, so this human error may remain.

[0009] Furthermore, if the engine is operated without the rod body and the cap of the connecting rod being properly fastened and connected due to the bolts not being tightened with an appropriate torque, serious abnormalities such as burning of the crankshaft, the connecting rod, and metal parts may occur. Such serious abnormalities may cause the ship equipped with the engine to be out of service for a period of time, thus causing increased damage.

[0010] An object of the present invention is to provide a fastening force measuring device and a fastening force measuring method which can easily and accurately detect the fastening state of divided bodies constituting a joint body such as a connecting rod.

[0011] In order to solve the above-mentioned problems, the fastening force measuring device of the present invention measures the fastening force of a first split body and a second split body constituting a joint body based on a fastening component, and is characterized in that the fastening force measuring device comprises: a first terminal portion, which is in contact with a conductive first measured portion in the joint body; a second terminal portion, which is in contact with a conductive second measured portion connected to the first measured portion in the joint body; a positioning portion, which is positioned on the joint body in such a manner that the first terminal portion and the second terminal portion are in contact with the first measured portion and the second measured portion, respectively; and a measuring portion, which measures the fastening force based on the current of the first measured portion and the second measured portion.

[0012] In addition, the fastening force measuring method of the present invention uses the above-mentioned fastening force measuring device to measure the fastening force of the first split body and the second split body, and is characterized in that the fastening force measuring method has the following steps: a holding step of holding the fastening force measuring device; an insertion step of inserting the fastening force measuring device into a space where the first split body and the second split body are arranged; an exploration step of exploring the gap between the first split body and the second split body using the positioning part moving along the outer peripheral surface of the joint body; a measurement preparation step of pressing the positioning part against the joint body in a state where the positioning part is positioned in the gap to shift the height of the positioning part to a lower height and make the first terminal part and the second terminal part contact the first split body and the second split body respectively; and a measurement step of starting the measurement of the fastening force after the measurement preparation step is completed.

[0013] Alternatively, the fastening force measuring method of the present invention uses the above-mentioned fastening force measuring device to measure the fastening force of the first split body and the second split body, and the fastening force measuring method has the following steps: a holding step of holding the fastening force measuring device; an insertion step of inserting the fastening force measuring device into a space where the first split body and the second split body are arranged; an engagement step of engaging the positioning portion with the head of the bolt; a measurement preparation step of bringing the first terminal portion and the second terminal portion into contact with the head of the bolt and the first split body, respectively; and a measurement step of starting the measurement of the fastening force after the measurement preparation step is completed.

[0014] Effects of the Invention

[0015] According to the present invention, a fastening force measuring device and a fastening force measuring method are provided, which can easily and accurately detect the fastening state of divided bodies constituting a joint body such as a connecting rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram showing an example of a fastening force measuring device according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram showing a state in which a positioning portion is supported by a holding portion in a normal state in the fastening force measuring device according to the embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram showing a state in which a positioning portion of the fastening force measuring device according to the embodiment of the present invention moves downward.

[0019] Figure 4 This is a schematic diagram showing an example of an engine to which the fastening force measuring device according to the embodiment of the present invention is applied.

[0020] Figure 5 This is a schematic diagram showing an example of a connecting rod of an engine to which the fastening force measuring device according to the embodiment of the present invention is applied.

[0021] Figure 6 This is a graph showing the relationship between the resistance value and the fastening force between the rod body and the cover portion of the connecting rod of the engine.

[0022] Figure 7 This is a schematic diagram showing a state in which a positioning portion is supported by a holding portion in a normal state in a fastening force measuring device according to another example of the present invention.

[0023] Figure 8It is a schematic diagram showing a first example of a fastening force measuring device according to another embodiment of the present invention.

[0024] Fig. 9 It is a schematic diagram showing a second example of a fastening force measuring device according to another embodiment of the present invention.

[0025] Fig.10 It is a schematic diagram showing a third example of a fastening force measuring device according to another embodiment of the present invention.

[0026] Fig.11 It is a schematic diagram showing a fourth example of a fastening force measuring device according to another embodiment of the present invention.

[0027] Fig.12 This is a block diagram showing a management system in which the fastening force measuring device according to the embodiment of the present invention is incorporated.

[0028] Fig.13 This is a graph showing the relationship between the resistance value and the temperature between the rod body and the cover portion of the connecting rod of the engine.

[0029] Fig.14 This is a schematic diagram showing an example of a fastening force measuring device according to another embodiment of the present invention.

[0030] Description of Reference Numerals

[0031] 1…fastening force measuring device; 2…holding portion; 2c…gripping portion; 3…first terminal portion; 4…second terminal portion; 5…positioning portion; 6…measuring portion; 11…force applying member; 100…engine; 103…crankcase; 103a…inspection window; 106…crankshaft; 110…connecting rod; 111…small end portion; 112…large end portion; 113…connecting portion; 115…rod body portion; 116…cover portion; 118…bolt; 120…gap; 140…fitting hole; 141…engaging recess; 200…management system; 201…management server; 202…information system. DETAILED DESCRIPTION

[0032] A fastening force measuring device 1 according to an embodiment of the present invention will be described with reference to the accompanying drawings. Figure 1 , Figure 2 and Figure 3 As shown, the fastening force measuring device 1 includes a holding portion 2, a first terminal portion 3, a second terminal portion 4, a positioning portion 5, and a measuring portion 6. Each portion of the fastening force measuring device 1 will be described in detail later. Figure 1As a schematic diagram of an example of the fastening force measuring device 1 , a perspective view is shown of a structure in which a holding portion 2 is provided with a first terminal portion 3 , a second terminal portion 4 , and a positioning portion 5 , and an outline of a measuring portion 6 connected to the holding portion 2 is shown. Figure 2 A side view of the fastening force measuring device 1 is shown in which the positioning portion 5 is supported by the holding portion 2 in a normal state. Figure 3 This is a side view of the fastening force measuring device 1 showing the positioning portion 5 moving downward.

[0033] The fastening force measuring device 1 measures the strength of the engine 100 (see Figure 4 ) of the connecting rod 110 (refer to Figure 4 and Figure 5 ) and other joints. Figure 4 A cross-sectional view showing an example of the engine 100 is shown. Figure 5 An enlarged view of the large end 112 of the connecting rod 110 is shown.

[0034] like Figure 4 As shown, the engine 100 includes a plurality of cylinders 102 and a crankcase 103 in a cylinder block 101, and each cylinder 102 includes: a cylindrical cylinder body 104, which is communicated with the crankcase 103; and a piston 105, which is slidably accommodated in the cylinder body 104. A crankshaft 106 is rotatably supported by the crankcase 103, and the piston 105 of each cylinder 102 is connected to the crankshaft 106 via a connecting rod 110.

[0035] The crankcase 103 has a space for accommodating the crankshaft 106 . When the connection between the connecting rod 110 and the crankshaft 106 is also arranged in this space, the connection between the connecting rod 110 and the crankshaft 106 is released in this space when the piston 105 is removed.

[0036] The crankcase 103 is provided with an inspection window 103a for performing an operation of releasing the connection between the connecting rod 110 and the crankshaft 106. The inspection window 103a is provided on one side of the crankcase 103 at a position corresponding to each connection portion between the connecting rod 110 and the crankshaft 106 corresponding to each cylinder 102, specifically, at a position facing the rod body 115 and the cover 116 of the connecting rod 110.

[0037] For example, the connecting rod 110 includes a small end portion 111 connected to the piston 105 , a large end portion 112 connected to the crankshaft 106 , and a connecting portion 113 connecting the small end portion 111 and the large end portion 112 .

[0038] like Figure 5As shown, the connecting rod 110 is divided into a rod body 115 and a cover 116 at a large end 112. At least the rod body 115 and the cover 116 are made of a conductive material. The large end 112 is formed into a substantially annular shape, and when a connecting hole 117 connected to the crankshaft 106 is formed inside the large end 112, the connecting hole 117 is divided into a semicircular arc shape to divide the large end 112 into the rod body 115 and the cover 116.

[0039] The rod body 115 and the cover 116 are fastened and connected to each other by bolts 118 (fastening and connecting member) in a state where the split surfaces (joint surfaces) of each other are aligned. In this embodiment, the cover 116 (first split body) and the rod body 115 (second split body) are fastened and connected to each other by bolts 118 inserted from the cover 116 to the rod body 115. The rod body 115 is formed by the small end 111, the connecting portion 113 and a part of the large end 112, and the cover 116 is formed by another part of the large end 112.

[0040] The bolt 118 penetrates and fastens the rod body 115 and the cover 116 at a position radially outward from the connection hole 117 in a manner perpendicular to the dividing surface (joint surface) of the rod body 115 and the cover 116. Specifically, the bolt 118 is inserted through the cover 116 and screwed with the rod body 115 to fasten.

[0041] In addition, a predetermined gap 120 is formed on the outer peripheral surface (the outer peripheral surface intersecting the radial direction of the connection hole 117) that is continuous throughout the connected rod body 115 and cover 116 and between (at the connection position of) the rod body 115 and the cover 116. For example, the gap 120 is formed by the chamfered edge of the dividing surface (joining surface) of the rod body 115 facing the cover 116 and the chamfered edge of the dividing surface (joining surface) of the cover 116 facing the rod body 115.

[0042] Regarding the fastening force measuring device 1, the first terminal portion 3 is configured to contact the conductive first measured portion on the connecting rod 110 (joint body), and the second terminal portion 4 is configured to contact the conductive second measured portion connected to the first measured portion on the connecting rod 110. The positioning portion 5 is positioned on the connecting rod 110 in such a manner that the first terminal portion 3 and the second terminal portion 4 are in contact with the first measured portion and the second measured portion respectively at the same time. The measuring portion 6 detects the current between the first measured portion and the second measured portion by detecting the current flowing between the first terminal portion 3 and the second terminal portion 4, and calculates the resistance value between the first measured portion and the second measured portion based on the current between the first measured portion and the second measured portion. In addition, the measuring portion 6 measures the fastening force of the first split body and the second split body (rod body portion 115 and cover portion 116) based on the resistance value.

[0043] In this embodiment, the first split body (rod body 115 or cover 116) is the first measured part, and the second split body (cover 116 or rod body 115) is the second measured part.

[0044] The holding portion 2 supports the first terminal portion 3 and the second terminal portion 4 as a pair, and supports the positioning portion 5 between the first terminal portion 3 and the second terminal portion 4. The holding portion 2 is made of a non-conductive material, for example, a rectangular base 2a, and a protrusion 2b protruding upward from the center of the base 2a, and the base 2a and the protrusion 2b are formed as a whole. The holding portion 2 is configured to include a gripping portion 2c having a size and shape that is easy for an operator to hold. In addition, the gripping portion 2c is provided on the side surface (for example, the front surface, the rear surface) of the holding portion 2, and may have grooves, recesses, etc. for the operator's fingers to contact when holding, and may be subjected to surface processing with high friction.

[0045] The first terminal portion 3 is in contact with the rod body portion 115 or the cover portion 116 (first split body) when measuring the fastening connection force between the rod body portion 115 and the cover portion 116, and is composed of a conductive needle-shaped probe. In addition, the first terminal portion 3 can be configured to include: a conductive needle portion 3a, which is connected to the measuring portion 6 via the first wiring 7; and a non-conductive support portion 3b, which supports the needle portion 3a and is installed on the base 2a.

[0046] The first terminal portion 3 is provided on the base portion 2a on one side relative to the protruding portion 2b of the holding portion 2 in a state of protruding upward. For example, the first terminal portion 3 is supported by the holding portion 2 in a state of protruding at a predetermined first height relative to the holding portion 2. Specifically, the height of the end of the first terminal portion 3 is set to a predetermined first height relative to the bottom surface of the base portion 2a.

[0047] The second terminal 4 is also similar to the first terminal 3, and is in contact with the cover 116 or the rod body 115 (second split body) when measuring the fastening connection force between the rod body 115 and the cover 116, and is composed of a conductive needle-shaped probe. In addition, the second terminal 4 can be configured to include: a conductive needle 4a, which is connected to the measuring part 6 via the second wiring 8; and a non-conductive support 4b, which supports the needle 4a and is installed on the base 2a.

[0048] The second terminal portion 4 is provided on the base portion 2a on the other side (the opposite side of the first terminal portion 3) relative to the protruding portion 2b of the holding portion 2 in a state of protruding upward. For example, the second terminal portion 4 is also supported by the holding portion 2 in a state of protruding at a predetermined first height relative to the holding portion 2, similarly to the first terminal portion 3. Specifically, the height of the end is set to a predetermined first height relative to the bottom surface of the base portion 2a.

[0049] The first terminal portion 3 is provided to output (circulate) a specified measuring current (for example, a current of 1A) supplied from the measuring portion 6 to the first segmented body (rod body 115 or cover 116) in contact, and the second terminal portion 4 is provided to input (monitor) a measuring current supplied to the rod body 115 and the cover 116 from the second segmented body (cover 116 or rod body 115) in contact and transmit it to the measuring portion 6.

[0050] In addition, the first wiring 7 of the first terminal portion 3 and the second wiring 8 of the second terminal portion 4 can be arranged at a position that does not hinder the operator's grip of the retaining portion 2, for example, avoiding the upper surface of the positioning portion 5, the lower surface on the opposite side of the upper surface, and avoiding the side surface where the gripping portion 2c is provided, specifically, on the left surface and the right surface.

[0051] The positioning part 5 is engaged with the gap 120 between the rod body 115 and the cover 116 (joint position) when measuring the fastening force between the rod body 115 and the cover 116, and is made of a non-conductive material. The positioning part 5 is formed of a plate-like member along the gap 120 and has a tapered tip.

[0052] The positioning portion 5 is provided on the protruding portion 2b of the holding portion 2 in a state of protruding upward. Figure 2 As shown, the positioning portion 5 is set in a normal state in a state where it protrudes at a second height higher than the first height of the first terminal portion 3 and the second terminal portion 4 relative to the holding portion 2. Specifically, the height of the end of the positioning portion 5 relative to the bottom surface of the base 2a reaches the second height and is set in a normal state and supported by the holding portion 2. For example, the positioning portion 5 is configured so that both surfaces of its plate-like member are respectively opposed to the first terminal portion 3 and the second terminal portion 4. The tapered end of the plate-like member of the positioning portion 5 engages with the linear gap 120 formed between the rod body portion 115 and the cover portion 116.

[0053] And, if Figure 3As shown, the positioning portion 5 is supported by the holding portion 2 in a manner that allows it to move to a second height lower than the normal state. For example, the positioning portion 5 is inserted into the insertion hole 2d formed on the upper surface of the protruding portion 2b of the holding portion 2, and is urged upward by a force applying member 11 such as a coil spring provided inside the holding portion 2, and the upward movement is restricted to the second height by an upper limit limiting portion 12 such as a stopper. Thus, the positioning portion 5 maintains a normal state of the second height protruding upward from the inside of the holding portion 2 through the insertion hole 2d.

[0054] On the other hand, the positioning portion 5 moves downward by overcoming the force of the force applying member 11 due to the pressure from above, and enters the interior of the holding portion 2 through the insertion hole 2d, thereby moving to a height lower than the second height. In addition, the positioning portion 5 is configured to be able to move to a height lower than the first height, and on the other hand, the downward movement is limited to a predetermined lower limit height by a lower limit limiting portion 13 such as a stopper.

[0055] The measuring unit 6 measures the fastening force of the rod body 115 and the cover 116 (the first split body and the second split body) constituting the connecting rod 110 (joint body) and outputs the measurement result. The measuring unit 6 can calculate the fastening force of the bolt 118 fastening the rod body 115 and the cover 116 based on the measured fastening force of the rod body 115 and the cover 116. The measuring unit 6 measures the resistance value between the rod body 115 and the cover 116 and calculates the fastening force of the rod body 115 and the cover 116 based on the measurement result.

[0056] For example, Figure 6 2 is a graph showing the relationship between the resistance value and the fastening force between the rod body 115 and the cover 116 . It can be seen that the stronger the fastening force, the lower the resistance value. Figure 6 The curve A (solid line) is the measured Figure 5 A diagram of the resistance value between the measurement points A1 and A2, Figure 6 The curve B (dashed line) is the measured Figure 5 A diagram of the resistance value between the measurement points B1 and B2, Figure 6 The curve C (single-point dash line) is the measured Figure 5 A diagram of the resistance value between the measurement points C1 and C2.

[0057] The measuring section 6 is provided separately from the holding section 2 having the first terminal section 3, the second terminal section 4, and the positioning section 5, and is connected to the first terminal section 3 via the first wiring 7, and is connected to the second terminal section 4 via the second wiring 8. The measuring section 6 supplies a measuring current (e.g., a current of 1A) to the first terminal section 3 via the first wiring 7, and outputs (flows) the measuring current to the first split body (rod body 115 or cover 116) contacted by the first terminal section 3. When the measuring current that is supplied from the first terminal section 3 to the rod body 115 or cover 116 is input (monitored) from the second split body (cover 116 or rod body 115) to the second terminal section 4, the measuring section 6 inputs the measuring current transmitted from the second terminal section 4 via the second wiring 8.

[0058] The measuring unit 6 calculates and measures the resistance value between the rod body 115 and the cover 116 based on the measuring current output to the first terminal 3 and the measuring current input from the second terminal 4, and calculates and measures the fastening force of the rod body 115 and the cover 116 based on the resistance value.

[0059] In addition, the measuring unit 6 may start outputting and inputting the measuring current and measuring the fastening force according to a predetermined start operation such as pressing the start button. Alternatively, the measuring unit 6 may monitor the height of the positioning unit 5, and when it is detected that the height of the positioning unit 5 is below the first height of the first terminal unit 3 and the second terminal unit 4, start outputting and inputting the measuring current and measuring the fastening force.

[0060] The measuring unit 6 can be connected to a system such as a server that manages each component of the engine 100 to be measured in a communicable manner, and by sending the measurement results to the system, each component and the measurement results can be managed in the system in association.

[0061] As described above, according to the present embodiment, a fastening force measuring device 1 for measuring the fastening force of the first and second split bodies such as the cover 116 and the rod body 115 constituting the joint body such as the connecting rod 110 based on the bolt 118 (fastening member) comprises: a first terminal portion 3, which contacts the conductive first measured portion in the joint body; a second terminal portion 4, which contacts the conductive second measured portion connected to the first measured portion in the joint body; a positioning portion 5, which is positioned in the joint body in such a manner that the first terminal portion 3 and the second terminal portion 4 contact the first measured portion and the second measured portion, respectively; and a measuring portion 6, which measures the fastening force based on the current of the first and second measured portions. Specifically, the first measured portion is the first split body, the second measured portion is the second split body, and the positioning portion 5 is engaged with the gap 120 formed between the first split body and the second split body to be positioned.

[0062] In other words, according to the present embodiment, the fastening force measuring method for measuring the fastening force of the first split body and the second split body using the above-mentioned fastening force measuring device 1 has the following steps: a holding step of holding the fastening force measuring device 1; an insertion step of inserting the fastening force measuring device 1 into a space in which the first split body and the second split body are arranged; an exploration step of exploring the gap 120 between the first split body and the second split body using the positioning portion 5 that moves along the outer peripheral surface of the joint; a measurement preparation step of pressing the positioning portion 5 against the joint body with the positioning portion 5 positioned in the gap 120 so that the height of the positioning portion 5 is shifted to a lower position and the first terminal portion 3 and the second terminal portion 4 are respectively in contact with the first split body and the second split body; and a measurement step of starting the measurement of the fastening force after the measurement preparation step is completed.

[0063] Thus, the operator who measures the fastening force of the joint body to be measured makes the positioning part 5 contact the outer peripheral surface of the joint body and moves along the outer peripheral surface, thereby making the positioning part 5 engage with the gap 120 between the first split body and the second split body for positioning, and at this time, the first terminal part 3 and the second terminal part 4 can be reliably separated and arranged on the first split body and the second split body respectively and contact them. Therefore, the resistance value throughout the first split body and the second split body can be accurately measured by the measuring part 6, and therefore, the fastening force of the first split body and the second split body can be accurately calculated and measured based on the resistance value.

[0064] In addition, according to the present embodiment, the fastening force measuring device 1 includes a retaining portion 2 that supports a positioning portion 5, a first terminal portion 3, and a second terminal portion 4; the first terminal portion 3 and the second terminal portion 4 are supported on the retaining portion 2 in a state in which they protrude at a predetermined first height relative to the retaining portion 2; a state in which the positioning portion 5 protrudes at a second height higher than the first height relative to the retaining portion 2 is set to a normal state; and the positioning portion 5 is supported on the retaining portion 2 in a manner that allows it to move to a height lower than the second height.

[0065] Thus, when the operator makes the positioning portion 5 contact the outer peripheral surface of the assembly and moves along the outer peripheral surface, the first terminal portion 3 and the second terminal portion 4 can be prevented from contacting the outer peripheral surface of the assembly and being damaged. In addition, the operator can press the positioning portion 5 engaged with the gap 120 against the assembly so that the height of the positioning portion 5 is shifted to a lower height and the first terminal portion 3 and the second terminal portion 4 are respectively in contact with the first split body and the second split body.

[0066] Furthermore, according to the present embodiment, in the fastening force measuring device 1 , the holding portion 2 is configured to include the gripping portion 2 c to be gripped by the operator.

[0067] Thus, even when the joint body to be measured is arranged in a space that is difficult for the operator to see or a narrow space, the operator can hold the gripping portion 2c and easily insert the fastening force measuring device 1 into such a space for operation, thereby easily positioning the joint body. In addition, the positioning portion 5 is provided on the protruding portion 2b in the center of the holding portion 2. On the other hand, when the first terminal portion 3 and the second terminal portion 4 are provided on both sides of the protruding portion 2b, in order to prevent the hand of the operator holding the protruding portion 2b from contacting the needle portion 3a and the needle portion 4a of the first terminal portion 3 and the second terminal portion 4, the first terminal portion 3 and the second terminal portion 4 may have a supporting portion 3b and a supporting portion 4b having substantially the same height as the protruding portion 2b.

[0068] Furthermore, according to the present embodiment, in the fastening force measuring device 1 , the positioning portion 5 is formed of a plate-like member having a tip corresponding to the shape of the gap 120 between the first divided body and the second divided body.

[0069] Thus, the operator makes the positioning portion 5 of the plate-like component abut against the outer peripheral surface of the joint body and move along the outer peripheral surface, so that the positioning portion 5 can function as a scraper to remove attachments such as engine oil attached to the outer peripheral surface of the joint body, thereby making the surfaces of the first split body and the second split body as the measurement objects a clean state for measurement.

[0070] Furthermore, according to the present embodiment, in the fastening force measuring device 1 , the positioning portion 5 is made of a non-conductive material.

[0071] Thus, even if the non-conductive positioning portion 5 contacts the conductive bonding body, the influence on the resistance value across the first divided body and the second divided body can be suppressed, so that the resistance value can be accurately measured by the measuring portion 6 .

[0072] In addition, according to the present embodiment, with respect to the fastening force measuring device 1, the joint body is the connecting rod 110 of the engine 100, the first split body and the second split body are respectively the rod body 115 and the cover 116 of the connecting rod 110, or the cover 116 and the rod body 115, and are fastened to each other by bolts 118, and a maintenance window 103a facing the rod body 115 and the cover 116 is provided on one side of the engine 100.

[0073] Thus, even if the connecting rod 110 to be measured is arranged in a space or a narrow space inside the engine 100 that is difficult for the operator to visually see, making it difficult to visually confirm the rod body 115 and the cover 116 from the inspection window 103a, the operator can easily and reliably position it by moving the positioning part 5 along the outer peripheral surface of the connecting rod 110 without visually confirming the rod body 115 and the cover 116.

[0074] In addition, in the above-mentioned embodiment, the following example is described: a force is applied to the positioning portion 5 inserted into the insertion hole 2d of the retaining portion 2 using the force-applying component 11, thereby being configured to enable the positioning portion 5 to move from a normal state higher than the first terminal portion 3 and the second terminal portion 4 to a height below the first terminal portion 3 and the second terminal portion 4, but the present invention is not limited to this example.

[0075] In other examples, such as Figure 7 As shown, the positioning portion 5 can be configured to be supported on the upper surface of the holding portion 2 in a normal state by an elastic member 130 such as a deformable rubber. The elastic member 130 can be deformed instead of the force-applying member 11 to shift the height of the positioning portion 5 to a lower height, so that the positioning portion 5 can be moved from a normal state higher than the first terminal portion 3 and the second terminal portion 4 to a height lower than the first terminal portion 3 and the second terminal portion 4. In this case, the holding portion 2 may not be provided with the protrusion 2b, and the positioning portion 5 can be supported on the upper surface of the base 2a by the elastic member 130.

[0076] In addition, in the above embodiment, the following example is described: the positioning portion 5 is composed of a plate-shaped member having a tip corresponding to the linear shape of the gap 120 between the rod body portion 115 and the cover portion 116, but the present invention is not limited to this example. For example, the positioning portion 5 may be composed of a plurality of rod-shaped members arranged at intervals along the linear shape of the gap 120.

[0077] Furthermore, in the above-mentioned embodiment, the following example is described: the measuring part 6 is separately provided from the holding part 2 having the first terminal part 3, the second terminal part 4 and the positioning part 5, and is connected to the first terminal part 3 and the second terminal part 4 by means of the first wiring 7 and the second wiring 8, but the present invention is not limited to this example, and the measuring part 6 can be configured to be connected to the first terminal part 3 and the second terminal part 4 wirelessly.

[0078] In addition, in the above embodiment, the following example is described: the measuring part 6 is separately provided from the holding part 2 having the first terminal part 3, the second terminal part 4 and the positioning part 5, but the present invention is not limited to this example, and the measuring part 6 can be configured to be provided integrally with the holding part 2 and store the measured values.

[0079] In the above embodiment, the following example is described: the gap 120 for the positioning portion 5 to engage is formed by the chamfered edge of the dividing surface (joining surface) of the rod body portion 115 opposite to the cover portion 116, and the chamfered edge of the dividing surface (joining surface) of the cover portion 116 opposite to the rod body portion 115, but the present invention is not limited to this example. For example, the gap 120 can be formed by a groove on the outer peripheral surface of the rod body portion 115 or a groove on the outer peripheral surface of the cover portion 116.

[0080] In addition, in the above-mentioned embodiment, the following example is described: the fastening force measuring device 1 sets the first split body as the first part to be measured and the second split body as the second part to be measured relative to a joint body (connecting rod 110) composed of a first split body (rod body 115 or cover 116) and a second split body (cover 116 or rod body 115) fastened and connected by a fastening component (bolt 118), and the first terminal part 3 is in contact with the first split body and the second terminal part 4 is in contact with the second split body, but the present invention is not limited to this example.

[0081] In other embodiments, the fastening force measuring device 1 may be configured such that the fastening member is used as the first measured part and the first split body is used as the second measured part, the first terminal portion 3 is in contact with the fastening member and the second terminal portion 4 is in contact with the first split body.

[0082] For example, in other embodiments, Figure 1 , Figure 2 , Figure 3 , Figure 7 The fastening force measuring device 1 shown in the structure having the positioning portion 5 between the first terminal portion 3 and the second terminal portion 4 is configured such that the positioning portion 5 is engaged with the gap 120 provided between the bolt 118 and the cover portion 116 and the gap 120 provided in the cover portion 116 itself, so that the first terminal portion 3 is in contact with the head of the bolt 118 and the second terminal portion 4 is in contact with the cover portion 116. Furthermore, the measuring portion 6 measures the resistance value between the first terminal portion 3 and the second terminal portion 4, that is, the resistance value between the bolt 118 and the cover portion 116, and calculates the fastening force of the rod body portion 115 and the cover portion 116 based on the measurement result.

[0083] In addition, in other embodiments, the fastening force measuring device 1 is not limited to the structure having the positioning portion 5 between the first terminal portion 3 and the second terminal portion 4, or other structures such as Figure 8 to Figure 11 The structure shown.

[0084] Regarding the fastening force measuring device 1 of other structures, the first terminal portion 3 can be configured to be retractable relative to the holding portion 2 supporting the first terminal portion 3 and the second terminal portion 4. In addition, the second terminal portion 4 can be configured to be fixed to the holding portion 2, or can be configured to be retractable relative to the holding portion 2.

[0085] In addition, regarding the fastening force measuring device 1 of another structure, the measuring unit 6 measures the resistance value between the first terminal portion 3 and the second terminal portion 4, that is, the resistance value between the fastening member and the first split body, and based on the measurement result, calculates the fastening force of the rod body 115 and the cover 116. For example, the lower the resistance value between the fastening member and the first split body, the stronger the fastening force of the rod body 115 and the cover 116 is calculated by the measuring unit 6.

[0086] In the fastening force measuring device 1 of another configuration, the holding portion 2 supporting the first terminal portion 3 and the second terminal portion 4 includes the positioning portion 5 which is engaged with the fastening member (eg, the head of the bolt 118 ) for positioning.

[0087] In a first example of other implementations, as Figure 8 As shown, the positioning portion 5 is recessed in the lower surface of the holding portion 2 and is composed of a fitting hole 140 into which the head of the bolt 118 is fitted. Figure 8 (a) is a perspective view showing the fastening force measuring device 1 of the first embodiment from below, Figure 8 (b) is a bottom view of the fastening force measuring device 1 of the first embodiment, Figure 8 (c) is a side view of the fastening force measuring device 1 of the first embodiment. For example, the fitting hole 140 may be recessed to match the shape of the head of the bolt 118, that is, a hexagonal prism.

[0088] The first terminal portion 3 in contact with the head of the bolt 118 is arranged at the bottom of the fitting hole 140, and the second terminal portion 4 in contact with the rod body portion 115 or the cover portion 116 is arranged at the edge of the fitting hole 140. In addition, the first terminal portion 3 is configured to be able to extend and retract between a normal state in which it protrudes from the bottom of the fitting hole 140 to the opening side and a state in which it is pressed into the inside by the bolt 118 or the like that is fitted into the fitting hole 140. In addition, the second terminal portion 4 can be fixed in a state in which it protrudes in the same direction as the first terminal portion 3.

[0089] In a second embodiment of other implementations, as Fig. 9 As shown, the positioning portion 5 is recessed on one side surface of the holding portion 2 and is composed of an engaging recess 141 into which a part of the side surface of the head of the bolt 118 is engaged. Fig. 9 (a) is a perspective view showing the fastening force measuring device 1 of the second embodiment from below, Fig. 9 (b) is a side view of the fastening force measuring device 1 of the second embodiment, Fig. 9(c) is a bottom view of the fastening force measuring device 1 of the second embodiment. For example, the engaging recess 141 can be recessed to match the shape of the head of the bolt 118, that is, one corner of the side of the hexagonal prism, that is, it can be recessed to match the triangular prism with a vertex of 120 degrees. In addition, in the second embodiment, the first terminal portion 3 contacts the head of the bolt 118 from above, and the second terminal portion 4 contacts the rod body portion 115 or the cover portion 116 from above.

[0090] In addition, the holding portion 2 includes a first facing portion 142 that faces the head of the bolt 118 from above, and a second facing portion 143 that is provided on the side of the first facing portion 142 and faces the cover portion 116 that is a base material of the bolt 118 from above. For example, the first facing portion 142 and the second facing portion 143 are formed in a stepped shape with different heights in the up-down direction, and an engaging recess 141 is formed on the side surface of the second facing portion 143 that forms the step between the first facing portion 142 and the second facing portion 143.

[0091] The first terminal portion 3 in contact with the head of the bolt 118 is arranged on the lower surface of the first opposing portion 142, and the second terminal portion 4 in contact with the rod body portion 115 or the cover portion 116 is arranged on the lower surface of the second opposing portion 143. In addition, the first terminal portion 3 is configured to be able to extend and retract freely between a normal state in which it protrudes downward from the first opposing portion 142 and a state in which it is pressed into the inside by the bolt 118 or the like abutting against the first opposing portion 142. In addition, the second terminal portion 4 can be fixed to the second opposing portion 143 in a state in which it protrudes in the same direction as the first terminal portion 3, or can be fixed to the lower surface of the second opposing portion 143 in a substantially coplanar manner.

[0092] In a third embodiment of other implementations, as Fig.10 As shown, the positioning portion 5 is recessed on one side surface of the holding portion 2 and is composed of an engaging recess 141 into which a part of the side surface of the head of the bolt 118 is engaged. Fig.10 (a) is a perspective view showing the fastening force measuring device 1 of the third embodiment from below, Fig.10 (b) is a side view of the fastening force measuring device 1 of the third embodiment, Fig.10 (c) is a bottom view of the fastening force measuring device 1 of the third embodiment. The engaging recess 141 can be recessed in accordance with the shape of the head of the bolt 118, i.e., one corner of the side of the hexagonal prism, as in the second embodiment, i.e., can be recessed in accordance with a triangular prism having a vertex of 120 degrees. In addition, in the third embodiment, the first terminal portion 3 contacts the head of the bolt 118 from the side, and the second terminal portion 4 contacts the rod body portion 115 or the cover portion 116 from the top.

[0093] In addition, the holding portion 2 includes a first opposing portion 142 that is opposed to the head of the bolt 118 from the side, and a second opposing portion 143 that is provided on the side of the first opposing portion 142 and is opposed to the cover portion 116 that is the base material of the bolt 118 from the top. Fig.10 As shown, the first opposing portion 142 and the second opposing portion 143 are formed in steps with different heights in the vertical direction, and an engaging recess 141 is formed on the side of the first opposing portion 142. Alternatively, the first opposing portion 142 and the second opposing portion 143 may be formed without steps.

[0094] The first terminal portion 3 in contact with the head of the bolt 118 is arranged on the side of the first opposing portion 142, and the second terminal portion 4 in contact with the rod body portion 115 or the cover portion 116 is arranged on the lower surface of the second opposing portion 143. Fig.10 As shown, the side surface of the first opposing portion 142 may respectively have: a surface having an engaging recess 141 and a surface for arranging the first terminal portion 3 in the upper and lower directions, or may only have an engaging recess 141, and the first terminal portion 3 may be arranged in the engaging recess 141. In addition, the first terminal portion 3 is configured to be able to extend and retract freely between a normal state protruding laterally from the first opposing portion 142 and a state in which the first terminal portion 3 is pressed into the inside by a bolt 118 or the like abutting against the first opposing portion 142. In addition, the second terminal portion 4 may be fixed to the second opposing portion 143 in a state protruding downward, or may be fixed to the lower surface of the second opposing portion 143 in a substantially coplanar manner.

[0095] In a fourth embodiment of other implementations, as Fig.11 As shown, the positioning portion 5 is recessed on one side surface of the holding portion 2 and is composed of an engaging recess 141 into which a part of the side surface of the head of the bolt 118 is engaged. Fig.11 (a) is a perspective view showing the fastening force measuring device 1 of the fourth embodiment from below, Fig.11 (b) is a side view of the fastening force measuring device 1 of the fourth embodiment, Fig.11 (c) is a bottom view of the fastening force measuring device 1 of the fourth embodiment. The engaging recess 141 can be recessed in accordance with the shape of the head of the bolt 118, i.e., one corner of the side of the hexagonal prism, as in the second and third embodiments, i.e., can be recessed in accordance with a triangular prism having a vertex of 120 degrees. In addition, in the fourth embodiment, the first terminal portion 3 contacts the head of the bolt 118 from the side, and the second terminal portion 4 contacts the rod body portion 115 or the cover portion 116 from the side.

[0096] In addition, the holding portion 2 includes: a first opposing portion 142, which is opposed to the head of the bolt 118 from the side; and a second opposing portion 143, which is provided below the first opposing portion 142 and is opposed to the base material of the bolt 118, that is, the cover portion 116 from the side. Fig.11 As shown, the first opposing portion 142 and the second opposing portion 143 are formed in steps with different heights in the vertical direction, and an engaging recess 141 is formed on the side of the first opposing portion 142. Alternatively, the first opposing portion 142 and the second opposing portion 143 may be formed without steps.

[0097] The first terminal portion 3 in contact with the head of the bolt 118 is arranged on the side of the first opposing portion 142, and the second terminal portion 4 in contact with the rod body portion 115 or the cover portion 116 is arranged on the side of the second opposing portion 143. Fig.11 As shown, the side surface of the first opposing portion 142 may respectively include: a surface having an engaging recess 141 and a surface having the first terminal portion 3, or may only have the engaging recess 141 and have the first terminal portion 3 disposed in the engaging recess 141. In addition, the first terminal portion 3 is configured to be able to extend and retract between a normal state in which it protrudes laterally from the first opposing portion 142 and a state in which it is pressed into the interior by a bolt 118 or the like abutting against the first opposing portion 142. In addition, the second terminal portion 4 may be fixed to the second opposing portion 143 in a state in which it protrudes laterally, or may be fixed to the side surface of the second opposing portion 143 in a substantially coplanar manner.

[0098] As described above, according to another embodiment of the present invention, regarding the fastening force measuring device 1 for measuring the fastening force of the first split body and the second split body by the bolt 118 (fastening member) of the cover 116 and the rod body 115 constituting the joint body such as the connecting rod 110, the first split body and the second split body are fastened to each other by the fastening member, that is, the bolt 118 inserted from the first split body to the second split body. The first measured part is the head of the bolt 118, the second measured part is the first split body, and the positioning part 5 is engaged with the head of the bolt 118 to be positioned.

[0099] In other words, according to other embodiments, a fastening force measuring method for measuring the fastening force of the first split body and the second split body using the above-mentioned fastening force measuring device 1 has the following steps: a holding step of holding the fastening force measuring device 1; an insertion step of inserting the fastening force measuring device 1 into a space where the first split body and the second split body are arranged; an engagement step of engaging the positioning portion 5 with the head of the bolt 118; a measurement preparation step of bringing the first terminal portion 3 and the second terminal portion 4 into contact with the head of the bolt 118 and the first split body, respectively; and a measurement step of starting the measurement of the fastening force after the measurement preparation step is completed.

[0100] According to the above other embodiments, even in a situation where the operator cannot operate the fastening force measuring device 1 relative to the side of the connecting rod 110, if the fastening force measuring device 1 is operated relative to the fastening member such as the bolt 118, the fastening force of the rod body 115 and the cover 116 can be measured. For example, even in a situation where it is difficult to visually confirm the bolt 118 (fastening member) from the inspection window 103a, the operator can position the positioning portion 5 in cooperation with the bolt 118 without visually confirming the fastening member. Thus, the first terminal portion 3 and the second terminal portion 4 can be easily and reliably positioned relative to the first measured portion and the second measured portion as the measurement object.

[0101] In addition, in the above-mentioned embodiment, the following example is described: the fastening force measuring device 1 measures the fastening force of the first split body and the second split body such as the rod main body 115 and the cover part 116 fastened together by the bolt 118, but the present invention is not limited to this example. The fastening force measuring device 1 can measure the fastening force between two parts (the first split body and the second split body) fastened together by other fastening parts.

[0102] In addition, in the above-mentioned embodiment, the following example is described: the fastening force measuring device 1 measures the fastening force by taking the rod body portion 115 and the cover portion 116 of the connecting rod 110 of the engine 100 as the measurement objects, but the present invention is not limited to this example. The fastening force measuring device 1 is capable of measuring the fastening force between the other two parts (the first split body and the second split body) that split the connecting rod 110.

[0103] In the above-mentioned embodiment, the following example is described: the fastening force measuring device 1 measures the fastening force of a joint composed of a first split body and a second split body, taking the connecting rod 110 of the engine 100 as a measurement object, but the present invention is not limited to this example. The fastening force measuring device 1 is not limited to the connecting rod 110, and can be used to measure the fastening force of other joints composed of a first split body and a second split body fastened together by fastening components such as bolts 118.

[0104] In addition, in the above-mentioned embodiment, the following example is described: the fastening force measuring device 1 uses the measuring part 6 to calculate the fastening force of the first split body (cover part 116) and the first split body (rod body part 115) based on the resistance value (actual measured resistance value) between the first measured part (rod body part 115 or the head of the bolt 118) and the second measured part (cover part 116), but the present invention is not limited to this example.

[0105] In another embodiment, the measuring unit 6 converts the actual measured resistance value between the first measured part and the second measured part into a resistance value (converted resistance value) corresponding to the reference temperature of the connecting rod 110 based on the actual measured resistance value between the first measured part and the second measured part and the actual measured temperature of the connecting rod 110 during the measurement, and calculates the fastening connection force of the first split body and the first split body based on the converted resistance value.

[0106] For example, Fig.13 As shown in FIG. 1 , the resistance value between the first measured portion and the second measured portion of the connecting rod 110 tends to increase like a linear function as the temperature of the connecting rod 110 increases. Therefore, the measuring unit 6 stores resistance value conversion information such as a map or a mathematical expression showing the relationship between the resistance value and the temperature of the connecting rod 110 in advance, and calculates the converted resistance value corresponding to the reference temperature of the connecting rod 110 based on the resistance value conversion information and the actual measured resistance value and the actual measured temperature of the connecting rod 110.

[0107] Furthermore, the relationship between the resistance value and temperature of the connecting rod 110 varies depending on the material of the connecting rod 110 . Therefore, the fastening force measuring device 1 may store resistance value conversion information for each material of the connecting rod 110 in advance and use the resistance value conversion information corresponding to the material.

[0108] In another embodiment, the fastening force measuring device 1 includes a temperature sensor 9 (see Fig.14 The temperature sensor 9 is connected to the measuring unit 6 via the temperature wiring 9 a and transmits the temperature monitoring result of the connecting rod 110 to the measuring unit 6 .

[0109] The temperature sensor 9 is integrated with the holding portion 2, for example Fig.14 As shown, the temperature of the connecting rod 110 which is integrally provided with the positioning portion 5 and contacts the end of the positioning portion 5 is monitored. In addition, the temperature sensor 9 can perform temperature monitoring according to a predetermined monitoring operation such as a pressing operation of a monitoring button. Alternatively, the temperature sensor 9 can monitor the height of the positioning portion 5 and perform temperature monitoring when it is detected that the height of the positioning portion 5 is below the first height of the first terminal portion 3 and the second terminal portion 4.

[0110] Alternatively, although not shown, the temperature sensor 9 may be provided separately from the holding portion 2 in such a manner as to monitor the temperature of the connecting rod 110 in a non-contact manner using laser or the like.

[0111] In another embodiment, in order to prevent deviation of the actual measured resistance value between the first measured portion and the second measured portion of the connecting rod 110 measured by the measuring unit 6, the fastening force measuring device 1 may set the representative value calculated by measuring the actual measured resistance value multiple times and performing statistical processing as the actual measured resistance value used for calculation of the converted resistance value. In addition, in order to prevent deviation of the actual measured temperature of the connecting rod 110 monitored by the temperature sensor 9, the fastening force measuring device 1 may set the representative value calculated by monitoring the actual measured temperature multiple times and performing statistical processing as the actual measured temperature used for calculation of the converted resistance value.

[0112] Furthermore, the fastening force measuring device 1 can pre-set a predetermined permissible period for multiple measurements of actual measured resistance values ​​and multiple monitoring of actual measured temperatures, and detect an error when multiple measurements of actual measured resistance values ​​and multiple monitoring of actual measured temperatures are performed beyond the permissible period.

[0113] The fastening force measuring device 1 of the present invention can be used in an engine 100 or other equipment having a plurality of joints such as a connecting rod 110 to measure the fastening force of each joint. Fig.12 As shown, it can be assembled into a management system 200 for managing the device.

[0114] The management system 200 may include a management server 201 for recording and managing various data of the equipment, and input the measurement results of the fastening force of each joint body based on the fastening force measuring device 1 into the management server 201 for recording. The management server 201 can not only record the measurement results of the fastening force of each joint body, but also analyze the action status and degradation status of each joint body based on each measurement result and record the analysis results.

[0115] For example, the management server 201 is configured to be able to wirelessly communicate with a plurality of information terminals 202 such as smart phones and tablet terminals owned by operators and managers via a network 203, and the fastening force measuring device 1 is configured to be able to wirelessly communicate with the information terminal 202 via a short-range wireless method. The fastening force measuring device 1 sends the measurement result of the fastening force of the joint body to the information terminal 202 according to any operation or according to the completion of the measurement of the fastening force of the joint body, and the information terminal 202 sends the measurement result of the fastening force of the joint body received from the fastening force measuring device 1 to the management server 201.

[0116] The management server 201 records the measurement results of the fastening connection force of each joint body in association with the identification information of each joint body. In addition, the identification information of the joint body can be input from the identification information of the joint body pre-registered in the information terminal 202 and the management server 201 according to the selection operation of the information terminal 202, or the information not registered in the information terminal 202 and the management server 201 can be input according to any input operation.

[0117] The management server 201 can browse not only the measurement results of the fastening force of each joint body and the analysis results thereof recorded by the input information terminal 202 but also browse them by other information terminals 202 that are permitted to browse.

[0118] In addition, the resistance value of the connecting rod 110 and the fastening force corresponding to the resistance value may change as the connecting rod 110 changes over time. Therefore, the management server 201 can obtain the relationship between the measurement current output to the first terminal 3 and the measurement current input from the second terminal 4 and the resistance value between the first measured part and the second measured part of the connecting rod 110 according to the action state and degradation state of the connecting rod 110 through machine learning. In addition, the management server 201 can obtain the relationship between the resistance value between the first measured part and the second measured part of the connecting rod 110 and the fastening force between the first split body and the second split body of the connecting rod 110 according to the action state and degradation state of the connecting rod 110 through machine learning.

[0119] In addition, in the above-mentioned another embodiment, the following example is described: the measuring unit 6 converts the actual measured resistance value into a converted resistance value corresponding to the reference temperature of the connecting rod 110 based on the resistance value conversion information representing the relationship between the resistance value and temperature of the connecting rod 110 and according to the actual measured resistance value between the first measured part and the second measured part of the connecting rod 110 and the actual measured temperature of the connecting rod 110, and calculates the fastening connection force of the first split body and the first split body based on the converted resistance value, but the present invention is not limited to this example.

[0120] In another example, resistance conversion information indicating the relationship between the resistance value and the temperature of the connecting rod 110 is stored in the management server 201 in advance, and the actual measured resistance value between the first measured portion and the second measured portion of the connecting rod 110 and the actual measured temperature of the connecting rod 110 are input to the management server 201. Moreover, the management server 201 converts the actual measured resistance value into a converted resistance value corresponding to the reference temperature of the connecting rod 110 based on the resistance conversion information of the connecting rod 110 and the input actual measured resistance value and actual measured temperature of the connecting rod 110, and calculates the fastening connection force of the first segment and the first segment based on the converted resistance value. In addition, the management server 201 may store the resistance conversion information for each material of the connecting rod 110 in advance and use the resistance conversion information corresponding to the material.

[0121] In addition, the management server 201 may input the measurement date and time and the monitoring date and time when inputting the actual measured resistance value and the actual measured temperature of the connecting rod 110 , and store the actual measured resistance value and the actual measured temperature in association with the measurement date and time and the monitoring date and time.

[0122] In addition, the relationship between the resistance value and temperature of the connecting rod 110 may change due to the change of the connecting rod 110 over time. Therefore, the management server 201 can obtain the relationship between the resistance value and temperature of the connecting rod 110 according to the behavior and degradation of the connecting rod 110 through machine learning.

[0123] The present invention can be modified appropriately within the scope of the gist or concept of the invention that can be understood from the claims and the entire specification, and the technical concept of the present invention also includes a fastening force measuring device that accompanies such modification.

[0124] [Additional Notes on the Invention]

[0125] The following is a supplementary note of the summary of the invention extracted from the above-mentioned embodiment. In addition, each structure and each processing function described in the following supplementary note can be selected and combined arbitrarily.

[0126] <Note 1>

[0127] A fastening force measuring device for measuring the fastening force of a first split body and a second split body constituting a joint body by a fastening member, characterized in that:

[0128] The fastening force measuring device comprises:

[0129] a first terminal portion that contacts the conductive first measured portion of the junction body;

[0130] a second terminal portion, which contacts the conductive second portion to be measured and is connected to the first portion to be measured in the junction body;

[0131] a positioning portion positioned on the bonding body so that the first terminal portion and the second terminal portion are in contact with the first measured portion and the second measured portion, respectively; and

[0132] A measuring unit measures the fastening force based on the currents of the first measured part and the second measured part.

[0133] <Note 2>

[0134] The fastening force measuring device according to Supplementary Note 1 is characterized in that:

[0135] The first measured portion is the first segmented body,

[0136] The second measured portion is the second segmented body,

[0137] The positioning portion is engaged with a gap formed between the first split body and the second split body for positioning.

[0138] <Note 3>

[0139] The fastening force measuring device according to Supplementary Note 2 is characterized in that:

[0140] The fastening force measuring device includes a holding portion that supports the positioning portion, the first terminal portion, and the second terminal portion.

[0141] The first terminal portion and the second terminal portion are supported by the holding portion in a state of protruding at a predetermined first height.

[0142] The positioning portion is in a normal state in which the positioning portion protrudes relative to the holding portion at a second height higher than the first height, and the positioning portion is supported by the holding portion so as to be movable to a height lower than the second height.

[0143] <Note 4>

[0144] The fastening force measuring device according to Supplementary Note 3 is characterized in that:

[0145] The holding portion is configured to include a gripping portion.

[0146] <Note 5>

[0147] The fastening force measuring device according to any one of Supplementary Notes 2 to 4, characterized in that:

[0148] The positioning portion is formed of a plate-shaped member having a tip corresponding to a shape of the gap.

[0149] <Note 6>

[0150] The fastening force measuring device according to any one of Supplementary Notes 2 to 5, characterized in that:

[0151] The positioning portion is made of a non-conductive material.

[0152] <Note 7>

[0153] The fastening force measuring device according to any one of Supplementary Notes 2 to 6, characterized in that:

[0154] The joint body is a connecting rod of the engine,

[0155] The first split body and the second split body are respectively the rod body and the cover of the connecting rod, or the cover and the rod body, and are fastened to each other by bolts as the fastening member.

[0156] An inspection window facing the gap between the rod body and the cover is provided on one side surface of the engine.

[0157] <Note 8>

[0158] The fastening force measuring device according to Supplementary Note 1 is characterized in that:

[0159] The first split body and the second split body are fastened to each other by a bolt as the fastening member inserted from the first split body to the second split body.

[0160] The first measured portion is the head of the bolt,

[0161] The second measured portion is the first segmented body,

[0162] The positioning portion is engaged with the head of the bolt to be positioned.

[0163] <Note 9>

[0164] The fastening force measuring device according to Supplementary Note 8 is characterized in that:

[0165] The first terminal portion is configured to be retractable.

[0166] <Note 10>

[0167] The fastening force measuring device according to Supplementary Note 8 or 9 is characterized in that:

[0168] The positioning portion is composed of a fitting hole into which the head of the bolt is fitted.

[0169] <Note 11>

[0170] The fastening force measuring device according to Supplementary Note 8 or 9 is characterized in that:

[0171] The positioning portion is composed of an engaging recessed portion into which a part of the side surface of the head of the bolt is engaged.

[0172] <Note 12>

[0173] A method for measuring fastening force, comprising measuring the fastening force of the first split body and the second split body by using the fastening force measuring device according to any one of Appendix 2 to Appendix 7, wherein:

[0174] The method for measuring the fastening force comprises the following steps:

[0175] A holding step of holding the fastening force measuring device;

[0176] inserting the fastening force measuring device into a space where the first split body and the second split body are arranged;

[0177] a searching step of searching the gap between the first split body and the second split body by using the positioning portion moving along the outer peripheral surface of the joint body;

[0178] A measurement preparation step of pressing the positioning portion against the bonding body while the positioning portion is positioned in the gap to shift the height of the positioning portion to a lower height, and bringing the first terminal portion and the second terminal portion into contact with the first split body and the second split body, respectively; and

[0179] After the measurement preparation step is completed, the measurement step of measuring the fastening force is started.

[0180] <Note 13>

[0181] A method for measuring fastening force, comprising measuring the fastening force of the first split body and the second split body by using the fastening force measuring device as described in any one of Supplementary Notes 8 to 11, characterized in that:

[0182] The method for measuring the fastening force comprises the following steps:

[0183] A holding step of holding the fastening force measuring device;

[0184] inserting the fastening force measuring device into a space where the first split body and the second split body are arranged;

[0185] an engagement step of engaging the positioning portion with the head of the bolt;

[0186] a measurement preparation step of bringing the first terminal portion and the second terminal portion into contact with the head of the bolt and the first split body, respectively; and

[0187] After the measurement preparation step is completed, the measurement step of measuring the fastening force is started.

Claims

1. A fastening force measuring device for measuring the fastening force of a first split body and a second split body constituting a joint body by a fastening member, characterized in that: The fastening force measuring device comprises: a first terminal portion that contacts the conductive first measured portion of the junction body; a second terminal portion, which contacts the conductive second portion to be measured and is connected to the first portion to be measured in the junction body; a positioning portion positioned on the bonding body so that the first terminal portion and the second terminal portion are in contact with the first measured portion and the second measured portion, respectively; and A measuring unit measures the fastening force based on the currents of the first measured part and the second measured part.

2. The fastening force measuring device according to claim 1, characterized in that: The first measured portion is the first segmented body, The second measured portion is the second segmented body, The positioning portion is engaged with a gap formed between the first split body and the second split body for positioning.

3. The fastening force measuring device according to claim 2, characterized in that: The fastening force measuring device includes a holding portion that supports the positioning portion, the first terminal portion, and the second terminal portion. The first terminal portion and the second terminal portion are supported by the holding portion in a state of protruding at a predetermined first height. The positioning portion is in a normal state in which the positioning portion protrudes relative to the holding portion at a second height higher than the first height, and the positioning portion is supported by the holding portion so as to be movable to a height lower than the second height.

4. The fastening force measuring device according to claim 3, characterized in that: The holding portion is configured to include a gripping portion.

5. The fastening force measuring device according to claim 2, characterized in that: The positioning portion is formed of a plate-shaped member having a tip corresponding to a shape of the gap.

6. The fastening force measuring device according to claim 2, characterized in that: The positioning portion is made of a non-conductive material.

7. The fastening force measuring device according to claim 2, characterized in that: The joint body is a connecting rod of the engine, The first split body and the second split body are respectively the rod body and the cover of the connecting rod, or the cover and the rod body, and are fastened to each other by bolts as the fastening member. An inspection window facing the gap between the rod body and the cover is provided on one side surface of the engine.

8. The fastening force measuring device according to claim 1, characterized in that: The first split body and the second split body are fastened to each other by a bolt as the fastening member inserted from the first split body to the second split body. The first measured portion is the head of the bolt, The second measured portion is the first segmented body, The positioning portion is engaged with the head of the bolt to be positioned.

9. The fastening force measuring device according to claim 8, characterized in that: The first terminal portion is configured to be retractable.

10. The fastening force measuring device according to claim 8, characterized in that: The positioning portion is composed of a fitting hole into which the head of the bolt is fitted.

11. The fastening force measuring device according to claim 8, characterized in that: The positioning portion is composed of an engaging recessed portion into which a part of the side surface of the head of the bolt is engaged.

12. A method for measuring fastening force, comprising measuring the fastening force of the first split body and the second split body by using the fastening force measuring device according to claim 2, wherein: The method for measuring the fastening force comprises the following steps: A holding step of holding the fastening force measuring device; inserting the fastening force measuring device into a space where the first split body and the second split body are arranged; a searching step of searching the gap between the first split body and the second split body by using the positioning portion moving along the outer peripheral surface of the joint body; A measurement preparation step of pressing the positioning portion against the bonding body while the positioning portion is positioned in the gap to shift the height of the positioning portion to a lower height, and bringing the first terminal portion and the second terminal portion into contact with the first split body and the second split body, respectively; and After the measurement preparation step is completed, the measurement step of measuring the fastening force is started.

13. A method for measuring fastening force, comprising measuring the fastening force of the first split body and the second split body by using the fastening force measuring device according to claim 8, wherein: The method for measuring the fastening force comprises the following steps: A holding step of holding the fastening force measuring device; inserting the fastening force measuring device into a space where the first split body and the second split body are arranged; an engagement step of engaging the positioning portion with the head of the bolt; a measurement preparation step of bringing the first terminal portion and the second terminal portion into contact with the head of the bolt and the first split body, respectively; as well as After the measurement preparation step is completed, the measurement step of measuring the fastening force is started.

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