Fastening force measuring device and fastening force measuring method

Abstract

To provide a fastening force measuring device and a fastening force measuring method that can easily and accurately detect a fastening state of split bodies that form a joint body such as a connecting rod.SOLUTION: A fastening force measuring device 1 measures a fastening force of a fastening member such as a bolt 118 that fastens a first split body and a second split body such as a cap part 116 and a rod body part 115 that form a joint body such as a connecting rod 110. The fastening force measuring device comprises: a first terminal part 3 that is in contact with a conductive first part to be measured; a second terminal part 4 that is in contact with a conductive second part to be measured connected to the first part to be measured; a positioning part 5 that is located on the joint body so as to bring the first terminal part 3 and the second terminal part 4 into contact with the first part to be measured and the first part to be measured, respectively; and a measuring unit 6 that measures the fastening force on the basis of a current flowing between the first part to be measured and the second part to be measured.SELECTED DRAWING: Figure 1

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 that constitute a joint such as a connecting rod of an engine. [Background technology]

[0002] Conventionally, engine maintenance may involve removing pistons from the engine. In large engines used for marine or land-based power generation, in order to pull out the pistons from the tops of the cylinders with the connecting rods still connected, it is necessary to disconnect a large number of connecting rods from the crankshaft. In addition, when assembling the pistons and connecting rods to the engine after the maintenance is completed, it is necessary to connect the connecting rods to the crankshaft. Specifically, the connecting rod is divided into a rod body portion and a cap portion at the big end, and it is necessary to fasten the rod body portion and the cap portion together while the crankshaft is connected to a connecting hole formed between the rod body portion and the cap portion.

[0003] For example, in Patent Document 1, the method of tightening the cap bolts of a connecting rod is described as follows: in an engine equipped with a connecting rod that is divided into two parts, a rod and a cap, at a plane perpendicular to the center line at the crank pin portion, with the cap fastened to the rod by a cap bolt, and an inspection window provided in the lower part of the side of the cylinder block, there are four cap bolts for each connecting rod, and the cap bolts are attached and removed by inserting a barrier wrench through the inspection window. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 6-262537 Summary of the Invention [Problem to be solved by the invention]

[0005] In the maintenance of large engines, workers manually tighten a large number of connecting rods by inserting tools through inspection windows formed on the side of the engine (cylinder block). However, depending on the size of the engine, the size of the inspection window may not be large enough for the worker to check the connecting rod work location.

[0006] Therefore, during maintenance, it is not easy to accurately check the fastening of all the bolts of the connecting rod, and there is a risk that accurate management cannot be performed when the fastening state of the bolts is managed by parameters such as the fastening torque and angle. For example, even when managing by the fastening torque, if contamination is present between the segments that make up the connecting rod, the segments may not be properly joined together even if the fastening torque value is appropriate. In addition, there is a risk that "forgetting to tighten a bolt" (including insufficient fastening force) may occur due to human error, and such human error may remain because the fastening state of the bolts cannot be accurately checked.

[0007] Furthermore, if the bolts are not tightened with the correct torque and the connecting rod body and cap are not properly fastened, and the engine is operated, there is a risk of serious problems occurring, such as seizure of the crankshaft, connecting rod, metal, etc. Such serious problems will cause downtime for the ship on which the engine is installed, resulting in significant damage.

[0008] An object of the present invention is to provide a fastening force measuring device and a fastening force measuring method that can easily and accurately detect the fastening state of split bodies that constitute a joint such as a connecting rod. [Means for solving the problem]

[0009] In order to solve the above problems, the fastening force measuring device of the present invention is a fastening force measuring device that measures the fastening force of a fastening member between a first divided body and a second divided body that constitute a joint, and is characterized in that it comprises a first terminal portion that contacts a first conductive measured part in the joint, a second terminal portion that contacts a second conductive measured part connected to the first measured part in the joint, a positioning portion that is positioned on the joint so that the first terminal portion and the second terminal portion contact the first measured part and the first measured part, respectively, and a measuring portion that measures the fastening force based on the current between the first measured part and the second measured part.

[0010] In addition, the fastening force measuring method of the present invention is a fastening force measuring method for measuring the fastening force between the first divided body and the second divided body using the above-mentioned fastening force measuring device, and is characterized in that it includes a gripping step of gripping the fastening force measuring device, an insertion step of inserting the fastening force measuring device into a space in which the first divided body and the second divided body are arranged, a search step of searching the gap between the first divided body and the second divided body by the positioning part moved along the outer peripheral surface of the joined body, a measurement preparation step of positioning the positioning part in the gap, pressing the positioning part against the joined body to displace the height of the positioning part lower and bring the first terminal part and the second terminal part into contact with the first divided body and the second divided body, respectively, and a measurement step of starting measurement of the fastening force after completion of the measurement preparation step. Alternatively, the fastening force measuring method of the present invention is a fastening force measuring method for measuring the fastening force between the first division and the second division using the above-mentioned fastening force measuring device, and includes a gripping step of gripping the fastening force measuring device, an insertion step of inserting the fastening force measuring device into the space in which the first division and the second division are arranged, an engagement step of engaging the positioning portion with the head of the bolt, a measurement preparation step of contacting the first terminal portion and the second terminal portion with the head of the bolt and the first division, respectively, and a measurement step of starting measurement of the fastening force after completion of the measurement preparation step. Effect of the Invention

[0011] According to the present invention, there is provided a fastening force measuring device and a fastening force measuring method that can easily and accurately detect the fastening state of split bodies that constitute a joint such as a connecting rod. [Brief description of the drawings]

[0012] [Figure 1] 1 is a schematic diagram illustrating an example of a fastening force measuring device according to an embodiment of the present invention. [Diagram 2] 1 is a schematic diagram showing a state in which a positioning part is supported by a holding part in a normal state in a fastening force measuring device according to an embodiment of the present invention; [Diagram 3] 1 is a schematic diagram showing a state in which a positioning part has been moved downward in a fastening force measuring device according to an embodiment of the present invention; FIG. [Figure 4] 1 is a schematic diagram showing an example of an engine to which a fastening force measuring device according to an embodiment of the present invention is applied; [Diagram 5] 1 is a schematic diagram showing an example of a connecting rod of an engine to which a fastening force measuring device according to an embodiment of the present invention is applied; [Figure 6] 4 is a graph showing the relationship between the electrical resistance value between a rod main body and a cap portion and the fastening force in an engine connecting rod. [Figure 7] 13 is a schematic diagram showing a state in which a positioning part is supported by a holding part in a normal state in a fastening force measuring device according to another example of the present invention. FIG. [Figure 8] FIG. 4 is a schematic diagram showing a first example of a fastening force measuring device according to another embodiment of the present invention. [Figure 9] FIG. 11 is a schematic diagram showing a second embodiment of a fastening force measuring device according to another embodiment of the present invention. [Figure 10] FIG. 11 is a schematic diagram showing a third embodiment of a fastening force measuring device according to another embodiment of the present invention. [Figure 11] FIG. 11 is a schematic diagram showing a fourth embodiment of a fastening force measuring device according to another embodiment of the present invention. [Figure 12]1 is a block diagram showing a management system incorporating a fastening force measuring device according to an embodiment of the present invention. [Figure 13] 4 is a graph showing the relationship between the electrical resistance value between a rod main body and a cap portion and the temperature in an engine connecting rod. [Figure 14] FIG. 13 is a schematic diagram showing an example of a fastening force measuring device according to a further embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] A fastening force measuring device 1 according to an embodiment of the present invention will be described with reference to the drawings. As shown in Figs. 1, 2 and 3, the fastening force measuring device 1 includes a holding unit 2, a first terminal unit 3, a second terminal unit 4, a positioning unit 5 and a measuring unit 6. Details of each unit of the fastening force measuring device 1 will be described later. Fig. 1 shows a perspective view of a configuration including a first terminal unit 3, a second terminal unit 4 and a positioning unit 5 in a holding unit 2 as a schematic diagram of an example of the fastening force measuring device 1, and also shows an overview of a measuring unit 6 connected to the holding unit 2. Fig. 2 shows a side view of the fastening force measuring device 1 in which the positioning unit 5 is supported by the holding unit 2 in a normal state, and Fig. 3 shows a side view of the fastening force measuring device 1 in which the positioning unit 5 has been moved downward.

[0014] The fastening force measuring device 1 measures the fastening force of segments that make up a joined body such as a connecting rod 110 (see Figs. 4 and 5) of an engine 100 (see Fig. 4). Fig. 4 shows a cross-sectional view of an example of the engine 100, and Fig. 5 shows an enlarged view of a big end 112 of the connecting rod 110.

[0015] 4, engine 100 includes a cylinder block 101, a plurality of cylinders 102, and a crankcase 103. Each cylinder 102 has a cylindrical cylinder 104 communicating with crankcase 103, and a piston 105 slidably housed in cylinder 104. A crankshaft 106 is rotatably supported by crankcase 103, and the piston 105 of each cylinder 102 is connected to crankshaft 106 via a connecting rod 110.

[0016] The crankcase 103 has a space for accommodating the crankshaft 106, and the connection between the connecting rod 110 and the crankshaft 106 is also arranged in this space. When removing the piston 105, the operation for releasing the connection between the connecting rod 110 and the crankshaft 106 is performed in this space.

[0017] The crankcase 103 is provided with an inspection window 103a for performing an operation to release 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 point between the connecting rod 110 and the crankshaft 106 corresponding to each cylinder 102, and specifically, at a position facing the rod main body portion 115 and cap portion 116 of the connecting rod 110.

[0018] For example, the connecting rod 110 has a small end 111 connected to the piston 105, a big end 112 connected to the crankshaft 106, and a connecting portion 113 connecting the small end 111 and the big end 112.

[0019] 5, the connecting rod 110 is divided at the big end 112 into a rod main body portion 115 and a cap portion 116. At least the rod main body portion 115 and the cap portion 116 are made of a conductive material. The big end 112 is formed in a substantially annular shape, and a connecting hole 117 that is connected to the crankshaft 106 is formed inside thereof, and the big end 112 is divided into the rod main body portion 115 and the cap portion 116 so as to divide the connecting hole 117 into a semicircular arc shape.

[0020] The rod main body 115 and the cap portion 116 are joined to each other by fastening them with bolts 118 (fastening members) with their divided surfaces (joint surfaces) aligned. In this embodiment, the cap portion 116 (first divided body) and the rod main body 115 (second divided body) are fastened to each other by bolts 118 that are inserted from the cap portion 116 to the rod main body 115. The rod main body 115 is formed by the small end portion 111, the connecting portion 113, and a part of the big end portion 112, and the cap portion 116 is formed by another part of the big end 112.

[0021] The bolt 118 is fastened by penetrating through the rod main body 115 and the cap portion 116 so as to be perpendicular to the dividing surface (joint surface) of the rod main body 115 and the cap portion 116, radially outward from the connecting hole 117. Specifically, the bolt 118 is fastened by being inserted through the cap portion 116 and screwed into the rod main body 115.

[0022] In addition, a predetermined gap 120 is formed between the rod main body 115 and the cap portion 116 (at the joining position) on the outer circumferential surface (the outer circumferential surface intersecting the radial direction of the connecting hole 117) that continues across the joined rod main body 115 and the cap portion 116. For example, this gap 120 is formed by a chamfered edge of the divided surface (joint surface) of the rod main body 115 facing the cap portion 116 and a chamfered edge of the divided surface (joint surface) of the cap portion 116 facing the rod main body 115.

[0023] In the fastening force measuring device 1, the first terminal portion 3 is configured to contact a conductive first measured portion in the connecting rod 110 (joint), and the second terminal portion 4 is configured to contact a conductive second measured portion connected to the first measured portion in the connecting rod 110. The positioning portion 5 is positioned on the connecting rod 110 so that the first terminal portion 3 and the second terminal portion 4 are simultaneously brought into contact with the first measured portion and the first measured portion, respectively. The measuring portion 6 detects a current flowing between the first terminal portion 3 and the second terminal portion 4 to detect a current between the first measured portion and the second measured portion, and calculates an electrical 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. The measuring portion 6 also measures the fastening force of the first divided body and the second divided body (the rod main body portion 115 and the cap portion 116) based on the electrical resistance value.

[0024] The following describes the details of each part of the fastening force measuring device 1 of this embodiment. In this embodiment, the first divided body (rod main body 115 or cap 116) is the first measured part, and the second divided body (cap 116 or rod main body 115) is the second measured part.

[0025] The holding part 2 supports the first terminal part 3 and the second terminal part 4 in a pair, and supports the positioning part 5 between the first terminal part 3 and the second terminal part 4. The holding part 2 is made of a non-conductive material, and is formed, for example, with a rectangular parallelepiped base part 2a and a protrusion part 2b protruding upward from the center of the base part 2a, and the base part 2a and the protrusion part 2b are integrally formed. The holding part 2 is configured to include a grip part 2c having a size, shape, etc. that makes it easy for an operator to grip. The grip part 2c is provided on a side surface (for example, the front surface or the rear surface) of the holding part 2, and may have a groove or a depression where an operator places his / her finger when gripping it, or may be subjected to a surface treatment with a relatively high friction force.

[0026] The first terminal 3 is configured as a conductive needle-shaped probe that comes into contact with the rod main body 115 or the cap 116 (first divided body) when measuring the fastening force between the rod main body 115 and the cap 116. The first terminal 3 may be configured of a conductive needle 3a connected to the measuring unit 6 via the first wiring 7, and a non-conductive support 3b that supports the needle 3a and is attached to the base 2a.

[0027] The first terminal portion 3 is provided on the base portion 2a on one side of the protrusion 2b of the holding portion 2 in a state where it protrudes upward. For example, the first terminal portion 3 is supported by the holding portion 2 in a state where it protrudes at a predetermined first height from the holding portion 2, and specifically, the first terminal portion 3 is provided so that the height of the tip end of the first terminal portion 3 is the predetermined first height from the bottom surface of the base portion 2a.

[0028] Like the first terminal 3, the second terminal 4 is configured as a conductive needle-shaped probe that comes into contact with the cap 116 or the rod main body 115 (second divided body) when measuring the fastening force between the rod main body 115 and the cap 116. The second terminal 4 may be configured of a conductive needle 4a connected to the measuring unit 6 via the second wiring 8, and a non-conductive support 4b that supports the needle 4a and is attached to the base 2a.

[0029] The second terminal portion 4 is provided on the base portion 2a on the other side (opposite side to the first terminal portion 3) of the protrusion 2b of the holding portion 2 in a state where it protrudes upward. For example, similar to the first terminal portion 3, the second terminal portion 4 is supported by the holding portion 2 in a state where it protrudes at a predetermined first height from the holding portion 2, and specifically, is provided so that the height of the tip portion is the predetermined first height from the bottom surface of the base portion 2a.

[0030] The first terminal portion 3 is provided for outputting (passing) a predetermined measurement current (e.g., a current of 1 A) supplied from the measuring portion 6 to the first divided body (rod main body portion 115 or cap portion 116) with which it comes into contact, and the second terminal portion 4 is provided for inputting (detecting) the measurement current passed through the rod main body portion 115 and the cap portion 116 from the second divided body (cap portion 116 or rod main body portion 115) with which it comes into contact, and transmitting it to the measuring portion 6.

[0031] The first wiring 7 of the first terminal portion 3 and the second wiring 8 of the second terminal portion 4 are preferably provided in positions that do not prevent an operator from gripping the holding portion 2, for example, positions that avoid the upper surface on which the positioning portion 5 is present and the lower surface opposite the upper surface, and positions that avoid the side surface on which the gripping portion 2c is provided, specifically, on the left or right surface.

[0032] The positioning portion 5 is configured to engage with the gap 120 between the rod body portion 115 and the cap portion 116 (at the joining position) when measuring the fastening force between the rod body portion 115 and the cap portion 116, and is configured with a non-conductive material. The positioning portion 5 is, for example, a plate-like member that fits along the gap 120 and is formed with a tapered tip.

[0033] The positioning portion 5 is provided on the protrusion 2b of the holding portion 2 in a state where it protrudes upward. As shown in FIG. 2, the positioning portion 5 is in a normal state in which it protrudes from the holding portion 2 at a second height higher than the first height of the first terminal portion 3 and the second terminal portion 4, and specifically, is supported by the holding portion 2 in a normal state in which the height of the tip of the positioning portion 5 is the second height from the bottom surface of the base portion 2a. For example, the positioning portion 5 is disposed so that both surfaces of the plate-like member thereof face the first terminal portion 3 and the second terminal portion 4, respectively. The tapered tip of the plate-like member of the positioning portion 5 is engaged with a linear gap 120 formed between the rod main body portion 115 and the cap portion 116.

[0034] 3, the positioning portion 5 is supported by the holding portion 2 so as to be movable to a height lower than the second height, which is the normal state. For example, the positioning portion 5 is inserted into an insertion hole 2d formed on the upper surface of the protrusion 2b of the holding portion 2, and is biased upward by a biasing member 11 such as a coil spring provided inside the holding portion 2, and its upward movement is restricted to the second height by an upper limit restriction portion 12 such as a stopper. As a result, the positioning portion 5 maintains its normal state of the second height protruding upward from inside the holding portion 2 through the insertion hole 2d.

[0035] Meanwhile, in response to pressure from above, the positioning portion 5 moves downward against the biasing force of the biasing member 11 and enters the inside of the holding portion 2 through the insertion hole 2d, thereby moving to a height lower than the second height. Note that while the positioning portion 5 is configured to be movable to a height lower than the first height, the downward movement is restricted to a predetermined lower limit height by a lower limit restriction portion 13 such as a stopper.

[0036] The measuring unit 6 measures the fastening force of the rod main body 115 and the cap portion 116 (first division and second division) that constitute the connecting rod 110 (joint body) and outputs the measurement result. The measuring unit 6 may calculate the fastening force of the bolt 118 that fastens the rod main body 115 and the cap portion 116 based on the measured fastening force of the rod main body 115 and the cap portion 116. The measuring unit 6 measures the electrical resistance value between the rod main body 115 and the cap portion 116 and calculates the fastening force of the rod main body 115 and the cap portion 116 based on the measurement result.

[0037] For example, Fig. 6 is a graph showing the relationship between the electrical resistance value between the rod main body 115 and the cap 116 and the fastening force, and it can be seen that the stronger the fastening force, the lower the electrical resistance value. Graph A (shown by a solid line) in Fig. 6 is a measurement of the electrical resistance value between measurement points A1 and A2 in Fig. 5, graph B (shown by a dashed line) in Fig. 6 is a measurement of the electrical resistance value between measurement points B1 and B2 in Fig. 5, and graph C (shown by a dashed line) in Fig. 6 is a measurement of the electrical resistance value between measurement points C1 and C2 in Fig. 5.

[0038] The measuring unit 6 is provided separately from the holding unit 2 including the first terminal unit 3, the second terminal unit 4, and the positioning unit 5, and is connected to the first terminal unit 3 via the first wiring 7 and to the second terminal unit 4 via the second wiring 8. The measuring unit 6 supplies a measurement current (for example, a current of 1 A) to the first terminal unit 3 via the first wiring 7, and outputs (passes) the measurement current to the first divided body (rod main body unit 115 or cap unit 116) with which the first terminal unit 3 is in contact. When the second terminal unit 4 inputs (detects) the measurement current applied from the first terminal unit 3 to the rod main body unit 115 or cap unit 116 from the second divided body (cap unit 116 or rod main body unit 115), the measuring unit 6 inputs the measurement current transmitted from the second terminal unit 4 via the second wiring 8.

[0039] The measurement unit 6 calculates and measures the electrical resistance value between the rod main body portion 115 and the cap portion 116 based on the measurement current output to the first terminal portion 3 and the measurement current input from the second terminal portion 4, and calculates and measures the fastening force of the rod main body portion 115 and the cap portion 116 based on the electrical resistance value.

[0040] The measurement unit 6 may start outputting and inputting a measurement current to measure the fastening force in response to a predetermined start operation such as pressing a start button. Alternatively, the measurement unit 6 may monitor the height of the positioning unit 5, and when it detects that the height of the positioning unit 5 has become equal to or lower than the first height of the first terminal unit 3 and the second terminal unit 4, start outputting and inputting a measurement current to measure the fastening force.

[0041] The measurement unit 6 may be communicatively connected to a system such as a server that manages each part of the engine 100 being measured, and by transmitting the measurement results to the system, the system can manage each part in association with the measurement results.

[0042] As described above, according to the present embodiment, the fastening force measuring device 1 for measuring the fastening force of the bolt 118 (fastening member) between the first and second divided bodies, such as the cap portion 116 and the rod main body portion 115, constituting a joint such as a connecting rod 110, includes a first terminal portion 3 that contacts a conductive first measured portion in the joint, a second terminal portion 4 that contacts a conductive second measured portion connected to the first measured portion in the joint, a positioning portion 5 that is positioned in the joint so that the first terminal portion 3 and the second terminal portion 4 are brought into contact with the first measured portion and the first measured portion, respectively, and a measuring portion 6 that measures the fastening force based on the current between the first measured portion and the second measured portion. Specifically, the first measured portion is the first divided body, the second measured portion is the second divided body, and the positioning portion 5 is engaged with and positioned in a gap 120 formed between the first and second divided bodies.

[0043] In other words, according to this embodiment, the fastening force measuring method for measuring the fastening force between the first and second divisions using the above-mentioned fastening force measuring device 1 includes a gripping step of gripping the fastening force measuring device 1, an insertion step of inserting the fastening force measuring device 1 into the space in which the first and second divisions are arranged, a search step of searching for the gap 120 between the first and second divisions by the positioning part 5 moved along the outer peripheral surface of the joined body, a measurement preparation step of pressing the positioning part 5 against the joined body with the positioning part 5 positioned in the gap 120 to lower the height of the positioning part 5 and bring the first terminal part 3 and the second terminal part 4 into contact with the first and second divisions, respectively, and a measurement step of starting measurement of the fastening force after completion of the measurement preparation step.

[0044] This allows an operator measuring the fastening force of the joined body to be measured to position the positioning part 5 by abutting it against the outer circumferential surface of the joined body and moving it along the outer circumferential surface to engage the positioning part 5 with the gap 120 between the first and second divided bodies, at which time the first terminal part 3 and the second terminal part 4 can be reliably arranged separately in the first and second divided bodies and brought into contact with each other. Therefore, the electrical resistance value across the first and second divided bodies can be accurately measured by the measuring part 6, and the fastening force between the first and second divided bodies can be accurately calculated and measured based on this electrical resistance value.

[0045] Furthermore, according to this embodiment, the fastening force measuring device 1 includes a positioning portion 5 and a holding portion 2 supporting the first terminal portion 3 and the second terminal portion 4, the first terminal portion 3 and the second terminal portion 4 being supported by the holding portion 2 in a state in which they protrude from the holding portion 2 at a predetermined first height, and the positioning portion 5 is supported by the holding portion 2 in such a way that it is movable to a height lower than the second height, with the normal state being a state in which it protrudes from the holding portion 2 at a second height higher than the first height.

[0046] This allows the worker to prevent the first terminal 3 and the second terminal 4 from coming into contact with the outer circumferential surface of the joined body and being damaged when the worker brings the positioning portion 5 into contact with the outer circumferential surface of the joined body and moves it along the outer circumferential surface. Also, the worker can press the positioning portion 5 engaged with the gap 120 against the joined body to lower the height of the positioning portion 5 and bring the first terminal 3 and the second terminal 4 into contact with the first divided body and the second divided body, respectively.

[0047] Moreover, according to this embodiment, in the fastening force measuring device 1, the holding portion 2 includes the gripping portion 2c that is gripped by an operator.

[0048] As a result, even if the joint to be measured is placed in a space where it is difficult for the worker to see or in a narrow space, the worker can easily insert and operate the fastening force measuring device 1 into such a space by holding the holding portion 2c, and can easily position the fastening force measuring device 1 relative to the joint. In addition, the positioning portion 5 is provided on the protrusion 2b in the center of the holding portion 2, while the first terminal portion 3 and the second terminal portion 4 are provided on both sides of the protrusion 2b, and in order to prevent the hand of the worker holding the protrusion 2b from touching the needle portion 3a and the needle portion 4a of the first terminal portion 3 and the second terminal portion 4, it is preferable that the first terminal portion 3 and the second terminal portion 4 have support portions 3b and 4b at approximately the same height as the protrusion 2b.

[0049] Furthermore, according to this embodiment, in the fastening force measuring device 1, the positioning section 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.

[0050] This allows the operator to abut the positioning portion 5 of the plate-shaped member against the outer peripheral surface of the joined body and move it along the outer peripheral surface, thereby causing the positioning portion 5 to function as a scraper to remove any oil or other deposits that have adhered to the outer peripheral surface of the joined body, and thereby enabling measurements to be performed with the surfaces of the first and second divided bodies to be measured in a clean state.

[0051] Furthermore, according to this embodiment, the positioning portion 5 of the fastening force measuring device 1 is made of a non-conductive material.

[0052] As a result, even if the non-conductive positioning portion 5 abuts against a conductive joint, the effect on the electrical resistance value across the first and second divisions is suppressed, and the electrical resistance value can be accurately measured by the measuring portion 6.

[0053] Furthermore, according to this embodiment, in the fastening force measuring device 1, the joint is a connecting rod 110 of the engine 100, and the first and second split bodies are the rod main body portion 115 and the cap portion 116, or the cap portion 116 and the rod main body portion 115, of the connecting rod 110, respectively, which are fastened to each other by a bolt 118, and an inspection window 103a facing the rod main body portion 115 and the cap portion 116 is provided on one side of the engine 100.

[0054] As a result, even if the connecting rod 110 to be measured is located in a space within the engine 100 that is difficult for an operator to see or a narrow space, and it is difficult to visually check the rod main body portion 115 and the cap portion 116 through the inspection window 103a, the operator can easily and reliably perform positioning by moving the positioning portion 5 along the outer peripheral surface of the connecting rod 110 without visually checking the rod main body portion 115 and the cap portion 116.

[0055] In the above-described embodiment, an example has been described in which the positioning portion 5 inserted into the insertion hole 2d of the holding portion 2 is biased by the biasing member 11, thereby making it possible to move the positioning portion 5 from a normal state in which the positioning portion 5 is 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; however, the present invention is not limited to this example.

[0056] 7, the positioning portion 5 may be configured to be supported in a normal state on the upper surface of the holding portion 2 by an elastic member 130 such as a deformable rubber. Instead of the biasing member 11, the height of the positioning portion 5 is lowered by deforming the elastic member 130, and the positioning portion 5 can move from a normal state in which the positioning portion 5 is higher than the first terminal portion 3 and the second terminal portion 4 to a height equal to or lower than the first terminal portion 3 and the second terminal portion 4. In this case, the holding portion 2 does not need to be provided with the protrusion 2b, and the positioning portion 5 may be supported by the elastic member 130 on the upper surface of the base portion 2a.

[0057] In the above embodiment, the positioning unit 5 is configured with a plate-like member having a tip that corresponds to the linear shape of the gap 120 between the rod body 115 and the cap 116. However, the present invention is not limited to this example. For example, the positioning unit 5 may be configured with a plurality of rod-like members that are spaced apart along the linear shape of the gap 120.

[0058] Furthermore, in the above embodiment, an example has been described in which the measurement unit 6 is provided separately from the first terminal portion 3 and the holding portion 2 having the second terminal portion 4 and the positioning portion 5, and is connected to the first terminal portion 3 and the second terminal portion 4 via the first wiring 7 and the second wiring 8, but the present invention is not limited to this example, and the measurement unit 6 may be configured to be connected to the first terminal portion 3 and the second terminal portion 4 wirelessly.

[0059] In addition, in the above embodiment, an example has been described in which the measurement unit 6 is provided separately from the holding unit 2 having the first terminal portion 3, the second terminal portion 4, and the positioning portion 5. However, the present invention is not limited to this example, and the measurement unit 6 may be provided integrally with the holding unit 2 and configured to store the measurement value.

[0060] In the above embodiment, an example has been described in which the gap 120 with which the positioning portion 5 engages is formed by a chamfered edge of the divided surface (joint surface) of the rod main body portion 115 facing the cap portion 116 and a chamfered edge of the divided surface (joint surface) of the cap portion 116 facing the rod main body portion 115, but the present invention is not limited to this example. For example, the gap 120 may be formed by a groove on the outer circumferential surface of the rod main body portion 115 or a groove on the outer circumferential surface of the cap portion 116.

[0061] In addition, in the above-mentioned embodiment, an example has been described in which the fastening force measuring device 1 brings the first terminal portion 3 into contact with the first division and the second terminal portion 4 into contact with the second division of a joint (connecting rod 110) consisting of a first division (rod main body portion 115 or cap portion 116) and a second division (cap portion 116 or rod main body portion 115) fastened by a fastening member (bolt 118), with the first division being the first measured portion and the second division being the second measured portion; however, the present invention is not limited to this example.

[0062] In another embodiment, the fastening force measuring device 1 may be configured so that the fastening member is the first measured part and the first divided body is the second measured part, and so that the first terminal portion 3 is brought into contact with the fastening member and the second terminal portion 4 is brought into contact with the first divided body.

[0063] For example, in another embodiment, the fastening force measuring device 1 having a positioning unit 5 between the first terminal 3 and the second terminal 4 as shown in Figures 1, 2, 3, and 7 engages the positioning unit 5 with a gap 120 provided between the bolt 118 and the cap 116 or with a gap 120 provided in the cap 116 itself, and brings the first terminal 3 into contact with the head of the bolt 118 and the second terminal 4 into contact with the cap 116. Then, the measuring unit 6 measures the electrical resistance between the first terminal 3 and the second terminal 4, i.e., the electrical resistance between the bolt 118 and the cap 116, and calculates the fastening force of the rod main body 115 and the cap 116 based on the measurement result.

[0064] In other embodiments, the fastening force measuring device 1 is not limited to a configuration having a positioning portion 5 between the first terminal portion 3 and the second terminal portion 4, or other configurations, such as those shown in Figures 8 to 11, may be applied.

[0065] In the fastening force measuring device 1 having another configuration, the first terminal portion 3 may be configured to be extendable and scalable with respect to the holding portion 2 that supports the first terminal portion 3 and the second terminal portion 4. The second terminal portion 4 may be configured to be fixed with respect to the holding portion 2, or may be configured to be extendable and scalable.

[0066] In addition, in a fastening force measuring device 1 having another configuration, the measuring unit 6 measures the electrical resistance value between the first terminal portion 3 and the second terminal portion 4, i.e., the electrical resistance value between the fastening member and the first divided body, and calculates the fastening force of the rod main body portion 115 and the cap portion 116 based on the measurement result. For example, the measuring unit 6 calculates that the lower the electrical resistance value between the fastening member and the first divided body, the stronger the fastening force of the rod main body portion 115 and the cap portion 116.

[0067] In addition, in a fastening force measuring device 1 having another configuration, the holding portion 2 supporting the first terminal portion 3 and the second terminal portion 4 has a positioning portion 5 that is engaged with and positioned by a fastening member (e.g., the head of a bolt 118).

[0068] In a first example of another embodiment, as shown in Fig. 8, the positioning portion 5 is recessed into the lower surface of the holding portion 2 and is composed of a fitting hole 140 into which the head of the bolt 118 fits. Fig. 8(a) is a perspective view showing the fastening force measuring device 1 of the first example from below, Fig. 8(b) is a bottom view of the fastening force measuring device 1 of the first example, and Fig. 8(c) is a side view of the fastening force measuring device 1 of the first example. For example, the fitting hole 140 may be recessed to match the hexagonal column shape of the head of the bolt 118.

[0069] The first terminal 3, which contacts the head of the bolt 118, is disposed at the bottom of the fitting hole 140, and the second terminal 4, which contacts the rod body 115 or the cap 116, is disposed at the edge of the fitting hole 140. The first terminal 3 is configured to be freely expandable between a normal state in which it protrudes from the bottom of the fitting hole 140 toward the opening side, and a state in which it is pushed inward by the bolt 118 or the like that fits into the fitting hole 140. The second terminal 4 is preferably fixed in a state in which it protrudes in the same direction as the first terminal 3.

[0070] In a second example of another embodiment, the positioning portion 5 is recessed in one side surface of the holding portion 2 as shown in FIG. 9, and is configured as an engagement recess 141 with which a part of the side surface of the head of the bolt 118 engages. FIG. 9(a) is a perspective view showing the fastening force measuring device 1 of the second example from below, FIG. 9(b) is a side view of the fastening force measuring device 1 of the second example, and FIG. 9(c) is a bottom view of the fastening force measuring device 1 of the second example. For example, the engagement recess 141 may be recessed to match one corner of the side surface of a hexagonal prism that is the shape of the head of the bolt 118, that is, to match a triangular prism having a vertex of 120 degrees. Furthermore, in the second example, the first terminal portion 3 is configured to contact the head of the bolt 118 from above, and the second terminal portion 4 is configured to contact the rod main body portion 115 or the cap portion 116 from above.

[0071] Moreover, the retaining portion 2 has a first opposing portion 142 that faces the head of the bolt 118 from above, and a second opposing portion 143 that is provided to the side of the first opposing portion 142 and faces the cap portion 116, which is the base material of the bolt 118, from above. For example, the first opposing portion 142 and the second opposing portion 143 are formed in a stepped shape with different heights in the vertical direction, and an engagement recess 141 is formed on the side surface of the second opposing portion 143 that forms the step between the first opposing portion 142 and the second opposing portion 143.

[0072] The first terminal portion 3 that contacts the head of the bolt 118 is disposed on the lower surface of the first opposing portion 142, and the second terminal portion 4 that contacts the rod main body portion 115 or the cap portion 116 is disposed on the lower surface of the second opposing portion 143. The first terminal portion 3 is configured to be freely expandable between a normal state in which it protrudes downward from the first opposing portion 142 and a state in which it is pushed inward by the bolt 118 or the like that abuts against the first opposing portion 142. The second terminal portion 4 may 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 may be fixed to the lower surface of the second opposing portion 143 in a substantially flush state.

[0073] In a third example of another embodiment, the positioning portion 5 is recessed in one side surface of the holding portion 2 as shown in FIG. 10, and is configured as an engagement recess 141 with which a part of the side surface of the head of the bolt 118 engages. FIG. 10(a) is a perspective view showing the fastening force measuring device 1 of the third example from below, FIG. 10(b) is a side view of the fastening force measuring device 1 of the third example, and FIG. 10(c) is a bottom view of the fastening force measuring device 1 of the third example. As in the second example, the engagement recess 141 may be recessed to match one corner of the side surface of the hexagonal prism that is the shape of the head of the bolt 118, that is, to match a triangular prism having a 120-degree apex. Furthermore, in the third example, the first terminal portion 3 is configured to contact the head of the bolt 118 from the side, and the second terminal portion 4 is configured to contact the rod main body portion 115 or the cap portion 116 from above.

[0074] Moreover, the retaining portion 2 has a first opposing portion 142 that faces 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 faces the cap portion 116, which is the base material of the bolt 118, from above. For example, the first opposing portion 142 and the second opposing portion 143 are formed in a stepped shape with different heights in the vertical direction, as shown in Fig. 10, and an engagement recess 141 is formed on the side surface of the first opposing portion 142. Alternatively, the first opposing portion 142 and the second opposing portion 143 may be formed without any steps.

[0075] The first terminal 3 that contacts the head of the bolt 118 is disposed on the side surface of the first opposing portion 142, and the second terminal 4 that contacts the rod body portion 115 or the cap portion 116 is disposed on the lower surface of the second opposing portion 143. As shown in FIG. 10, the side surface of the first opposing portion 142 may have a surface having an engagement recess 141 and a surface on which the first terminal 3 is disposed separately in the vertical direction, or may have only the engagement recess 141 and the first terminal 3 is disposed in the engagement recess 141. The first terminal 3 is configured to be freely expandable between a normal state in which it protrudes laterally from the first opposing portion 142 and a state in which it is pushed inward by the bolt 118 or the like that abuts against the first opposing portion 142. The second terminal 4 may be fixed to the second opposing portion 143 in a state in which it protrudes downward, or may be fixed to the lower surface of the second opposing portion 143 in a substantially flush manner.

[0076] In a fourth example of another embodiment, the positioning portion 5 is recessed in one side surface of the holding portion 2 as shown in FIG. 11, and is configured as an engagement recess 141 with which a part of the side surface of the head of the bolt 118 engages. FIG. 11(a) is a perspective view showing the fastening force measuring device 1 of the fourth example from below, FIG. 11(b) is a side view of the fastening force measuring device 1 of the fourth example, and FIG. 11(c) is a bottom view of the fastening force measuring device 1 of the fourth example. As in the second and third examples, the engagement recess 141 may be recessed to match one corner of the side surface of the hexagonal prism that is the shape of the head of the bolt 118, that is, to match a triangular prism having a 120-degree apex. Furthermore, in the fourth example, the first terminal portion 3 is configured to contact the head of the bolt 118 from the side, and the second terminal portion 4 is configured to contact the rod main body portion 115 or the cap portion 116 from the side.

[0077] Moreover, the retaining portion 2 has a first opposing portion 142 laterally facing the head portion of the bolt 118, and a second opposing portion 143 provided below the first opposing portion 142 and laterally facing the cap portion 116 which is the base material of the bolt 118. For example, as shown in Fig. 11, the first opposing portion 142 and the second opposing portion 143 are formed in a stepped shape having different heights in the vertical direction, and an engagement recess 141 is formed on the side surface of the first opposing portion 142. Alternatively, the first opposing portion 142 and the second opposing portion 143 may be formed without any steps.

[0078] The first terminal 3 that contacts the head of the bolt 118 is disposed on the side of the first opposing portion 142, and the second terminal 4 that contacts the rod body portion 115 or the cap portion 116 is disposed on the side of the second opposing portion 143. As shown in FIG. 11, the side of the first opposing portion 142 may have a surface having an engagement recess 141 and a surface on which the first terminal 3 is disposed separately in the up-down direction, or may have only the engagement recess 141 and the first terminal 3 is disposed in the engagement recess 141. The first terminal 3 is configured to be freely expandable between a normal state in which it protrudes laterally from the first opposing portion 142 and a state in which it is pushed inward by the bolt 118 or the like that abuts against the first opposing portion 142. The second terminal 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 of the second opposing portion 143 in a substantially flush manner.

[0079] As described above, according to this embodiment, in the fastening force measuring device 1 that measures the fastening force by the bolt 118 (fastening member) between the first and second divisions, such as the cap portion 116 and the rod main body portion 115 that constitute a joint such as a connecting rod 110, the first and second divisions are fastened to each other by the bolt 118, which is a fastening member, inserted from the first division to the second division. The first measured portion is the head of the bolt 118, the second measured portion is the first division, and the positioning portion 5 is engaged with the head of the bolt 118 to be positioned.

[0080] In other words, according to another embodiment, a fastening force measuring method for measuring the fastening force between the first and second divisions using the above-mentioned fastening force measuring device 1 includes a gripping step of gripping the fastening force measuring device 1, an insertion step of inserting the fastening force measuring device 1 into the space in which the first and second divisions 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 division, respectively, and a measurement step of starting to measure the fastening force after completion of the measurement preparation step.

[0081] According to the other embodiment described above, even in a situation where an operator cannot operate the fastening force measuring device 1 on the side surface of the connecting rod 110, if the operator operates the fastening force measuring device 1 on a fastening member such as the bolt 118, it is possible to measure the fastening force of the rod main body portion 115 and the cap portion 116. For example, even in a situation where it is difficult to visually check the bolt 118 (fastening member) through the inspection window 103a, the operator can position the positioning portion 5 to match the bolt 118 without visually checking the fastening member. This allows the first terminal portion 3 and the second terminal portion 4 to be easily and reliably positioned with respect to the first measured portion and the second measured portion that are the measurement targets.

[0082] In the above embodiment, an example has been described in which the fastening force measuring device 1 measures the fastening force of a first divided body and a second divided body, such as a rod main body portion 115 and a cap portion 116, which are fastened by a bolt 118. However, the present invention is not limited to this example, and the fastening force measuring device 1 can measure the fastening force between two members (a first divided body and a second divided body) fastened by another fastening member.

[0083] In addition, in the above embodiment, an example has been described in which the fastening force measuring device 1 measures the fastening force by using the rod main body portion 115 and the cap portion 116 of the connecting rod 110 of the engine 100 as measurement objects. However, the present invention is not limited to this example, and the fastening force measuring device 1 can measure the fastening force between the other two parts (first division and second division) into which the connecting rod 110 is divided.

[0084] In the above embodiment, an example has been described in which the fastening force measuring device 1 measures the fastening force of the connecting rod 110 of the engine 100 as a joined body consisting of a first split body and a second split body. However, the present invention is not limited to this example, and the fastening force measuring device 1 can be applied to measure the fastening force of other joined bodies consisting of a first split body and a second split body fastened by a fastening member such as a bolt 118, not limited to the connecting rod 110.

[0085] In the above embodiment, an example has been described in which the fastening force measuring device 1 calculates the fastening force of the first divided body (cap portion 116) and the first divided body (rod main body portion 115) based on the electrical resistance value (actual resistance value) between the first measured part (rod main body portion 115 or head of bolt 118) and the second measured part (cap portion 116) using the measuring unit 6, but the present invention is not limited to this example.

[0086] In a further embodiment, the measuring unit 6 converts the measured resistance value between the first measured portion and the second measured portion and the measured temperature of the connecting rod 110 at the time of the measurement into an electrical resistance value (converted resistance value) corresponding to the reference temperature of the connecting rod 110, and calculates the fastening force of the first division body and the first division body based on the converted resistance value.

[0087] 13, the electrical resistance between the first and second measured parts of the connecting rod 110 tends to increase like a linear function in response to an increase in the temperature of the connecting rod 110. Therefore, the measuring unit 6 stores resistance value conversion information such as a map or a formula showing the relationship between the electrical resistance value and temperature of the connecting rod 110, and calculates a converted resistance value corresponding to the reference temperature of the connecting rod 110 according to the actual measured resistance value and the actual measured temperature of the connecting rod 110 based on the resistance value conversion information.

[0088] In addition, since the relationship between the electrical resistance value and temperature of the connecting rod 110 differs depending on the material of the connecting rod 110, the fastening force measuring device 1 may store resistance value conversion information for each material of the connecting rod 110 and use the resistance value conversion information according to the material.

[0089] In a further embodiment, the fastening force measuring device 1 includes a temperature sensor 9 that detects the temperature of the connecting rod 110 (see FIG. 14). The temperature sensor 9 is connected to the measuring unit 6 via a temperature wiring 9a, and transmits the result of the temperature detection of the connecting rod 110 to the measuring unit 6.

[0090] The temperature sensor 9 is provided integrally with the holding portion 2, for example, as shown in Fig. 14, it is provided integrally with the positioning portion 5 and detects the temperature of the connecting rod 110 in contact with the tip of the positioning portion 5. The temperature sensor 9 may detect the temperature in response to a predetermined detection operation such as pressing a detection button. Alternatively, the temperature sensor 9 may monitor the height of the positioning portion 5 and detect the temperature when it detects that the height of the positioning portion 5 has become equal to or lower than the first height of the first terminal portion 3 and the second terminal portion 4.

[0091] Alternatively, although not shown, the temperature sensor 9 may be provided separately from the holding portion 2 so as to detect the temperature of the connecting rod 110 in a non-contact manner using a laser or the like.

[0092] In a further embodiment, in order to prevent variation in the measured resistance 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 use a representative value calculated by measuring the measured resistance multiple times and performing statistical processing as the measured resistance value used for calculating the converted resistance value. In addition, in order to prevent variation in the measured temperature of the connecting rod 110 detected by the temperature sensor 9, the fastening force measuring device 1 may use a representative value calculated by detecting the measured temperature multiple times and performing statistical processing as the measured temperature used for calculating the converted resistance value.

[0093] In addition, the fastening force measuring device 1 may preset a predetermined allowable period for multiple measurements of the actual resistance value or multiple detections of the actual temperature, and may detect an error if multiple measurements of the actual resistance value or multiple detections of the actual temperature are performed beyond the allowable period.

[0094] The fastening force measuring device 1 of the present invention can be applied to measure the fastening force of each connected body in an equipment such as an engine 100 that has a plurality of connected bodies such as a connecting rod 110, and further, as shown in FIG. 12, can be incorporated into a management system 200 that manages the equipment.

[0095] The management system 200 has a management server 201 that records and manages various data of the equipment, and the measurement results of the fastening force of each joined body by the fastening force measuring device 1 can be input and recorded in the management server 201. The management server 201 not only records the measurement results of the fastening force of each joined body, but may also analyze the behavior and deterioration state of each joined body based on each measurement result and record the analysis results.

[0096] For example, the management server 201 is configured to be capable of wireless communication with a plurality of information terminals 202, such as smartphones and tablet terminals owned by workers and managers, via a network 203, and the fastening force measuring device 1 is configured to be capable of wireless communication with the information terminals 202 via short-range wireless. The fastening force measuring device 1 transmits the measurement result of the fastening force of the joined body to the information terminal 202 in response to an arbitrary operation or in response to completion of measurement of the fastening force of the joined body, and the information terminal 202 transmits the measurement result of the fastening force of the joined body received from the fastening force measuring device 1 to the management server 201.

[0097] The management server 201 records the measurement result of the fastening force of each joined body in association with the identification information of each joined body. The identification information of the joined body may be input in response to a selection operation on the information terminal 202 from identification information of joined bodies previously registered in the information terminal 202 or the management server 201, or information not registered in the information terminal 202 or the management server 201 may be input in response to an arbitrary input operation.

[0098] The management server 201 allows the recorded measurement results of the fastening force of each joint and the analysis results thereof to be viewed not only on the information terminal 202 that input the data, but also on other information terminals 202 that are permitted to view the data.

[0099] In addition, the electrical resistance value of the connecting rod 110 and the fastening force corresponding to the electrical resistance value may change due to the aging of the connecting rod 110. Therefore, the management server 201 may acquire the relationship between the measurement current output to the first terminal unit 3 and the measurement current input from the second terminal unit 4, and the electrical resistance value between the first measured part and the second measured part of the connecting rod 110, according to the behavioral state and deterioration state of the connecting rod 110, by machine learning. In addition, the management server 201 may acquire the relationship between the electrical resistance value between the first measured part and the second measured part of the connecting rod 110, according to the behavioral state and deterioration state of the connecting rod 110, and the fastening force of the first divided body and the second divided body of the connecting rod 110, by machine learning.

[0100] In addition, in the above-mentioned further embodiment, an example has been described in which the measuring unit 6 converts the actual resistance value between the first measured portion and the second measured portion of the connecting rod 110 and the actual temperature of the connecting rod 110 based on resistance value conversion information indicating the relationship between the electrical resistance value and temperature of the connecting rod 110 into a converted resistance value corresponding to the reference temperature of the connecting rod 110, and calculates the fastening 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.

[0101] In another example, resistance value conversion information showing the relationship between the electrical resistance value and temperature of the connecting rod 110 is stored in the management server 201, and the measured resistance value between the first and second measured parts of the connecting rod 110 and the measured temperature of the connecting rod 110 are input to the management server 201. Then, based on the resistance value conversion information of the connecting rod 110, the management server 201 converts the measured resistance value into a converted resistance value corresponding to the reference temperature of the connecting rod 110 according to the input measured resistance value and measured temperature of the connecting rod 110, and calculates the first division body and the fastening force of the first division body based on the converted resistance value. It is preferable that the management server 201 stores resistance value conversion information for each material of the connecting rod 110 and uses the resistance value conversion information according to the material.

[0102] In addition, when inputting the measured resistance value or measured temperature of the connecting rod 110, the management server 201 may input the measurement date and time or the detection date and time, and store the measured resistance value or measured temperature in association with the measurement date and time or the detection date and time.

[0103] Note that the relationship between the electrical resistance value and the temperature of the connecting rod 110 may change due to aging of the connecting rod 110. Therefore, the management server 201 may obtain the relationship between the electrical resistance value and the temperature of the connecting rod 110 according to the behavior status and deterioration status of the connecting rod 110 by machine learning.

[0104] In addition, the present invention can be modified as appropriate within the scope that does not contradict the gist or idea of ​​the invention that can be read from the claims and the entire specification, and the fastening force measuring device with such modifications is also included in the technical idea of ​​the present invention.

[0105] [Appendix to the invention] The following will provide an overview of the invention extracted from the above-described embodiment. Note that the configurations and processing functions described in the following supplementary notes can be selected and combined as desired.

[0106] <Appendix 1> A fastening force measuring device for measuring a fastening force of a fastening member between a first divided body and a second divided body that constitute a joint body, a first terminal portion that contacts a conductive first measured portion in the bonded body; a second terminal portion that contacts a conductive second measured portion connected to the first measured portion in the bonded body; a positioning portion that is positioned on the bonded body so that the first terminal portion and the second terminal portion are brought into contact with the first measured portion and the second measured portion, respectively; A measurement unit that measures the fastening force based on a current between the first measurement target portion and the second measurement target portion; A fastening force measuring device comprising:

[0107] <Appendix 2> the first measured portion is the first divided body, the second measured portion is the second divided body, The fastening force measuring device described in Appendix 1, characterized in that the positioning portion is positioned by engaging with a gap formed between the first divided body and the second divided body.

[0108] <Appendix 3> a holding portion for supporting 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 where they protrude at a predetermined first height, The fastening force measuring device described in Appendix 2, characterized in that the positioning portion has a normal state in which it protrudes from the holding portion at a second height higher than the first height, and is supported by the holding portion so as to be movable to a height lower than the second height.

[0109] <Appendix 4> The fastening force measuring device according to claim 3, wherein the holding portion includes a gripping portion.

[0110] <Appendix 5> 5. The fastening force measuring device according to any one of claims 2 to 4, wherein the positioning portion is formed of a plate-like member having a tip that corresponds to the shape of the gap.

[0111] <Appendix 6> 6. The fastening force measuring device according to claim 2, wherein the positioning portion is made of a non-conductive material.

[0112] <Appendix 7> The joint is a connecting rod of an engine, The first division body and the second division body are a rod main body portion and a cap portion, or the cap portion and the rod main body portion, of the connecting rod, respectively, and are fastened to each other by a bolt that is the fastening member, 7. The fastening force measuring device according to any one of claims 2 to 6, wherein an inspection window facing the gap between the rod main body and the cap is provided on one side of the engine.

[0113] <Appendix 8> the first divided body and the second divided body are fastened to each other by a bolt, which is the fastening member, inserted from the first divided body to the second divided body; the first measured portion is a head portion of the bolt, the second measured portion is the first divided body, The fastening force measuring device according to claim 1, wherein the positioning portion is engaged with the head of the bolt to determine its position.

[0114] <Appendix 9> The fastening force measuring device according to claim 8, wherein the first terminal portion is configured to be extendable and contractible.

[0115] <Appendix 10> The fastening force measuring device according to claim 8 or 9, wherein the positioning portion is configured as a fitting hole into which the head of the bolt fits.

[0116] <Appendix 11> 10. The fastening force measuring device according to claim 8 or 9, wherein the positioning portion is configured with an engagement recess with which a portion of a side surface of the head of the bolt engages.

[0117] <Appendix 12> A fastening force measuring method for measuring a fastening force between the first divided body and the second divided body using the fastening force measuring device according to any one of appendices 2 to 7, a holding step of holding the fastening force measuring device; an insertion step of inserting the fastening force measuring device into a space in which the first divided body and the second divided body are arranged; a searching step of searching for the gap between the first divided body and the second divided body by the positioning unit moved along an outer circumferential surface of the joint body; a measurement preparation step in which, with the positioning portion positioned in the gap, the positioning portion is pressed against the joined body to lower the height of the positioning portion, thereby bringing the first terminal portion and the second terminal portion into contact with the first divided body and the second divided body, respectively; a measurement step of starting measurement of the fastening force after completion of the measurement preparation step.

[0118] <Appendix 13> A fastening force measuring method for measuring a fastening force between the first divided body and the second divided body using the fastening force measuring device according to any one of claims 8 to 11, a holding step of holding the fastening force measuring device; an insertion step of inserting the fastening force measuring device into a space in which the first divided body and the second divided body are arranged; an engaging step of engaging the positioning portion with a head of the bolt; a measurement preparation step of bringing the first terminal portion and the second terminal portion into contact with the head portion of the bolt and the first divided body, respectively; a measurement step of starting measurement of the fastening force after completion of the measurement preparation step. [Explanation of symbols]

[0119] 1 Fastening force measuring device 2 Holding part 2c Grip 3 1st terminal section 4 2nd terminal section 5 Positioning part 6 Measuring part 11. Pressing member 100 Engine 103 Crankcase 103a Inspection window 106 Crankshaft 110 Connecting rod 111 Small end 112 Big end 113 Connecting part 115 Rod body 116 Cap part 118 Volts 120 Gap 140 Fitting hole 141 Engagement recess 200 Management Systems 201 Management Server 202 Information Systems

Claims

1. A fastening force measuring device for measuring a fastening force of a fastening member between a first divided body and a second divided body that constitute a joined body, comprising: a first terminal portion that contacts a conductive first measured portion in the joint body; a second terminal portion that contacts a conductive second measured portion connected to the first measured portion in the bonded body; a positioning portion that is positioned on the bonded body so that the first terminal portion and the second terminal portion are brought into contact with the first measured portion and the second measured portion, respectively; A measuring unit that measures the fastening force based on a current between the first measured portion and the second measured portion; A fastening force measuring device comprising:

2. the first measured portion is the first divided body, the second measured portion is the second divided body, 2. The fastening force measuring device according to claim 1, wherein the positioning portion is positioned by being engaged with a gap formed between the first divided body and the second divided body.

3. a holding portion for supporting 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 where they protrude at a predetermined first height, The fastening force measuring device according to claim 2, characterized in that the positioning portion has a normal state in which it protrudes from the holding portion at a second height higher than the first height, and is supported by the holding portion so as to be movable to a height lower than the second height.

4. 4. The fastening force measuring device according to claim 3, wherein the holding portion includes a gripping portion.

5. 3. The fastening force measuring device according to claim 2, wherein the positioning portion is formed of a plate-like member having a tip that corresponds to the shape of the gap.

6. 3. The fastening force measuring device according to claim 2, wherein the positioning portion is made of a non-conductive material.

7. The joint is a connecting rod of an engine, the first division body and the second division body are a rod main body portion and a cap portion, or the cap portion and the rod main body portion, of the connecting rod, respectively, and are fastened to each other by a bolt which is the fastening member; 3. The fastening force measuring device according to claim 2, wherein an inspection window facing the gap between the rod body portion and the cap portion is provided on one side of the engine.

8. the first divided body and the second divided body are fastened to each other by a bolt, which is the fastening member, inserted from the first divided body to the second divided body; the first measured portion is a head portion of the bolt, the second measured portion is the first divided body, 2. The fastening force measuring device according to claim 1, wherein the positioning portion is engaged with a head portion of the bolt to determine its position.

9. 9. The fastening force measuring device according to claim 8, wherein the first terminal portion is configured to be extendable and retractable.

10. 9. The fastening force measuring device according to claim 8, wherein the positioning portion is formed of a fitting hole into which the head of the bolt fits.

11. 9. The fastening force measuring device according to claim 8, wherein the positioning portion is formed of an engagement recess with which a part of a side surface of the head of the bolt is engaged.

12. A fastening force measuring method for measuring a fastening force between the first divided body and the second divided body using the fastening force measuring device according to claim 2, a holding step of holding the fastening force measuring device; an insertion step of inserting the fastening force measuring device into a space in which the first divided body and the second divided body are arranged; a searching step of searching for the gap between the first divided body and the second divided body by the positioning unit moved along an outer circumferential surface of the joint body; a measurement preparation step in which, with the positioning portion positioned in the gap, the positioning portion is pressed against the joined body to lower the height of the positioning portion, thereby bringing the first terminal portion and the second terminal portion into contact with the first divided body and the second divided body, respectively; a measurement step of starting measurement of the fastening force after completion of the measurement preparation step.

13. A fastening force measuring method for measuring a fastening force between the first divided body and the second divided body using the fastening force measuring device according to claim 8, a holding step of holding the fastening force measuring device; an insertion step of inserting the fastening force measuring device into a space in which the first divided body and the second divided body are arranged; an engaging step of engaging the positioning portion with a head of the bolt; a measurement preparation step of bringing the first terminal portion and the second terminal portion into contact with the head portion of the bolt and the first divided body, respectively; a measurement step of starting measurement of the fastening force after completion of the measurement preparation step.

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