JP2000097789A - Load measuring instrument and dummy load measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure precise load measurement while simplifying the structure by constituting a load measuring instrument using a bolt such that an unnecessary external force does not act on a strain gauge even if an external force acts on a lead wire. SOLUTION: A bolt 12 is provided a bottomed containing hole 17 continuous coaxially to a tool engaging force 16, a lead out hole 18 and first and second through holes. A lead wire 14 continuous to a strain gauge 13 contained in the containing hole 17 is led out from the lead out hole 18 and wound around the heat part 12b of the bolt 12 before being passed through the first and second through holes. The tool engaging hole 16 and the containing hole 17 are filled with adhesive 22 filling the part of the strain gauge 13 and the lead wire 14 being arranged in the tool engaging hole 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load measuring device for measuring a load using a bolt for fastening between two members on which a load acts in a direction in which the loads are displaced from each other.

[0002]

2. Description of the Related Art Conventionally, a bolt is provided with a bottomed storage hole opened at the end face of a head, and a strain gauge is embedded in the storage hole to measure a load acting on two members fastened by the bolt. There is something that I did.

[0003]

However, in the above-described conventional device, the conductor connected to the strain gauge remains pulled out from the end face of the bolt head, and when an external force acts on the conductor, the conductor is distorted from the conductor. An unnecessary tensile load may act on the gauge.

The present invention has been made in view of such circumstances, and when a load measuring device is formed using bolts, even if an external force acts on a conducting wire, an unnecessary external force does not act on a strain gauge. In this way, a load measuring device with a simple structure that enables precise load measurement, and a dummy load measuring device that uses the load measuring device to measure the dummy load used in vehicle collision tests The purpose is to provide.

[0005]

In order to achieve the above object, a load measuring device according to the present invention is provided at least at a base end of a screw shaft portion on which a male screw is engraved on an outer periphery on a distal end side. A bolt having a bottomed tool engagement hole opened on the opposite side to the screw shaft portion and having a larger diameter than the screw shaft portion and having a head integrally and coaxially connected; A bottomed storage hole is provided coaxially with the tool engagement hole,
Insert the rotary operation tool into the tool engagement hole at a distance from the open end of the tool engagement hole, and set the inner surface of the tool engagement hole at a position set to be greater than the required distance required for engagement. A drawer hole that connects the outer surface of the head and an inner surface of the tool engagement hole and an outer surface of the head that are coaxially arranged on one diameter line of the bolt at substantially the same position as the drawer hole along the axis of the bolt; And a first and second through-holes respectively connecting the first and second through-holes are provided, and a lead wire connected to the strain gauge stored in the storage hole is drawn out to the outside from the draw-out hole and wound around the outer circumference of the head, and the first and second through-holes are wound around the head. An adhesive, which is inserted into the second through-hole and fills a portion of the strain gauge and the conductive wire which is arranged in the tool engagement hole, sets the distance from the open end of the tool engagement hole to the required distance or more, and sets the distance between the tool engagement hole and the required distance. For mating holes and storage holes Hama is the fact characterized.

[0006] According to such a configuration, the conducting wire connected to the strain gauge is drawn out of the lead-out hole, wound around the outer periphery of the head, further inserted into the first and second through-holes, and then engaged with the tool engagement. Since the conductive wire in the tool engagement hole is filled with the adhesive filled in the hole and the storage hole, the conductive wire is fixed to the bolt, and even if an external force acts on the conductive wire, the external force undesirably acts on the strain gauge. This makes it possible to perform precise load measurement using a strain gauge. Moreover, the adhesive is filled in the tool engagement hole and the storage hole so that the distance from the open end of the tool engagement hole is equal to or longer than the necessary distance required to engage the rotary operation tool in the tool engagement hole. Therefore, even when the strain gauge is mounted, the two members can be fastened by rotating the bolt. In addition, at least at the base end of the screw shaft portion on which the external thread is engraved on the outer periphery on the distal end side, there is a bottomed tool engagement hole opened on the opposite side to the screw shaft portion, and A bolt having a head formed in a large diameter and integrally and coaxially connected is widely used as a general commercial product, and a storage hole, a drawing hole, and By drilling the first and second through-holes, inserting a strain gauge, laying wires, and filling with an adhesive, a load measuring tool using bolts for fastening two members can be configured. It is.

According to a second aspect of the present invention, there is provided a dummy load measuring device according to the first aspect of the present invention, wherein the dummy components used for a vehicle crash test are fastened. According to this configuration, the load measuring tool also has a function of fastening between the dummy constituent members, so that the number of components can be reduced and the configuration can be simplified when measuring the dummy load.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

FIGS. 1 to 8 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a load measuring device, FIG. 2 is a plan view of FIG. FIG. 4 is a longitudinal side view, and FIG.
5 is a rear view of the spine and ribs viewed from the direction of arrow 4, FIG. 5 is a sectional view taken along line 5-5 of FIG. 4, FIG. 6 is a sectional view taken along line 6-6 of FIG. 3, and FIG. 8 is a side view of the hip joint.

Referring first to FIGS. 1 and 2, the load measuring device 11 includes a bolt 12 and a strain gauge 13 embedded and fixed to the bolt 12, and a conductor 14 connected to the strain gauge 13 is fixed to the bolt 12. Is done.

The bolt 12 has a screw shaft portion 12a on which an external thread 15 is engraved at least on the outer periphery on the distal end side, and a circular cross section having a larger diameter than the screw shaft portion 12a.
2a, a head 12 integrally and coaxially connected to the base end
b, and a bottomed tool engagement hole 16 opened on the opposite side to the screw shaft portion 12a is provided in the head portion 12b with a hexagonal cross-sectional shape. It is widely used as a product.

When the bolt 12 is used as a component member of the load measuring tool 11, a bottomed storage hole 17 coaxially connected to the tool engagement hole 16, an inner surface of the tool engagement hole 16 and the head 12b are formed. The head 1 is positioned at an angle between a drawer hole 18 connecting the outer surfaces thereof and an axis of the drawer hole 18.
2b, which is coaxially arranged on one diameter line and connects between the inner surface of the tool engagement hole 16 and the outer surface of the head portion 12b.
And the second through holes 19 and 20 are provided in the bolt 12.

The drawing hole 18 is provided in the tool engaging hole 1.
At a position where the distance L2 from the opening end of the bolt 6 is set larger than the required distance L1 required to insert and engage the hexagon wrench 21 or the like, which is a rotary operation tool, into the tool engagement hole 16, Twelve heads 12b. The first and second through-holes 19 and 20 are formed so that the position along the axis of the bolt 12 is substantially the same as that of the draw-out hole 18.
b.

The strain gauge 13 is housed in the housing hole 17, and the conducting wire 14 connected to the strain gauge 13 is provided.
Is drawn out of the head 12b from the drawer hole 18, wound around the outer periphery of the head 12b, and further inserted into the first and second through holes 19 and 20. Moreover, the strain gauge 13 housed in the housing hole 17 and the portion of the conductor 14 arranged in the tool engagement hole 16, that is, the portion from the strain gauge 13 to the drawing hole 18, and the first and second through holes 19, The portion between 20 is to be buried in an adhesive 22 filled in the tool engagement hole 16 and the storage hole 17, and the adhesive 22 has a distance L3 from the open end of the tool engagement hole 16 to the aforementioned distance. Set the tool engaging hole 16 as the required distance L1 or more.
And the storage hole 17 is filled.

The portion of the conductor 14 wound around the head 12b of the bolt 12 is also adhered to the bolt 12 by the adhesive 23.

In FIG. 3, a dummy 24 is used in a vehicle collision test. To fasten the components of the dummy 24, the load measuring tool 11 is used as follows.

That is, as shown in FIGS. 4 and 5,
The spine 2 which is one of the components of the dummy 24
5, a plurality of ribs 26, 26,..., Which are constituent members of the dummy 24, are arranged vertically at intervals.
The bolts 12 in each of the load measuring tools 11 are inserted into the ribs 26 and the vertebra 25 at two positions of the ribs 26 from the back side, and the nuts 27 are rotated in the spine. Each of the bolts 12 is screwed into contact with the front surface of the portion 25.

As described above, the vertebra 25 and each rib 2
By using the load measuring tools 11 to fasten the gaps between the ribs 26, 26, it is possible to individually measure the loads acting on the ribs 26, 26. It is possible to contribute to improvement of analysis accuracy.

As shown in FIG. 6, a flange 28 provided at the lower end of the cervical vertebra 28, which is a component of the dummy 24, is provided.
a is fastened to the upper end of the spine 25 at four places. The load measuring tools 11 are used to fasten the four places, and the impact loads acting on the joints of the cervical vertebra 28 and the spine 25 are applied to each of them. It can be obtained using the measured values of the load measuring tools 11.

As shown in FIG. 7, a flange 29 provided at the upper end of the lumbar vertebra 29, which is a component of the dummy 24, is provided.
a is fastened to the lower end of the spine portion 25 at four places, and the load measuring tools 11 are used for fastening at the four places, and the impact loads acting on the connection between the lumbar spine portion 29 and the spine portion 25 are each applied. It can be obtained using the measured values of the load measuring tools 11.

As shown in FIG. 8, the pelvis 30 which is a component of the dummy 24 is connected to the femur 32 via a hip 31 which is a component of the dummy 24.
The flange 31a of the hip joint 31 is
0 are fastened at four places, and the load measuring tools 11 are used for fastening at the four places. Therefore, the pelvis 3
The impact load acting between the zero and the hip joint 31 can be obtained using the measured values of the load measuring tools 11. In particular,
In a vehicle collision test, the pelvis 30 and the femur 32
May interfere with each other. By using the measured values of the load measuring tools 11 between the pelvis 30 and the hip joint 31, it is determined whether or not such interference has occurred, and the interference is determined. It is possible to gain strength,
It is possible to contribute to the improvement of the analysis accuracy of the impact load.

Next, the operation of the first embodiment will be described. In the load measuring device 11 in which the strain gauge 13 is embedded and fixed in the bolt 12, the conducting wire 14 connected to the strain gauge 13 is drawn out from the drawing hole 18 to the outside. Around the head 12b of the bolt 12,
After being inserted through the through holes 19 and 20, the tool engaging holes 16 are filled with the adhesive 22 filled in the storage holes 17 and the tool engaging holes 16.
Since the inner conductor is filled, the conductor 14 is fixed to the bolt 12. Therefore, even if an external force acts on the conductive wire 14, the external force does not undesirably act on the strain gauge 13, and accurate load measurement by the strain gauge 13 becomes possible.

Further, the adhesive 22 filled in the tool engagement hole 16 and the storage hole 17 engages the distance L3 from the open end of the tool engagement hole 16 with the hexagon wrench 21 in the tool engagement hole 16. The tool engagement hole 16 and the storage hole 17 are filled with the necessary distance L1 or more, which is necessary for the above, so that even when the strain gauge 13 is mounted, the bolt 12 can be rotated to fasten the two members. .

Further, a head 12a having a bottomed tool engaging hole 16 opened on the opposite side to the screw shaft portion 12a is integrally and coaxially connected to the base end of the screw shaft portion 12a. Numeral 12 is widely used as a general commercial product.
Withdrawal hole 18 and first and second through holes 19 and 2
0, a strain gauge 13 is inserted, a lead wire 14 is routed, a filling with an adhesive 22 and an adhesive 2 are performed.
By performing the application operation 3, the load measuring tool 11 using the bolts 12 for fastening the two members can be configured.

Moreover, a spine 25 and ribs 26 as constituent members of the dummy 24 used in a vehicle crash test are provided.
Between the spine 25 and the cervical spine 28, between the spine 25 and the lumbar spine 29, and the pelvis 30 and the hip 31
Since the gap is fastened by using the load measuring tools 11, the load measuring tools 11 also have a function of fastening between the constituent members of the dummy 24, thereby reducing the number of parts in measuring the load of the dummy 24 and The configuration can be simplified.

FIGS. 9 and 10 show a second embodiment of the present invention. FIG. 9 is a longitudinal sectional view of a load measuring device.
10 is a sectional view taken along line 10-10 of FIG.

In using the bolt 12 as a component member of the load measuring tool 11 ', a bottomed storage hole 17 coaxially connected to the tool engagement hole 16, an inner surface of the tool engagement hole 16 and the head 12b. The head 12 is positioned at an angle between the drawer hole 18 connecting the outer surfaces and the axis of the drawer hole 18.
The first and second through holes 19 and 20 which are coaxially arranged on one diameter line of b and connect the inner surface of the tool engagement hole 16 and the outer surface of the head 12b are provided on the bolt 12 as described above. This is the same as the first embodiment, but differs from the first embodiment in that a groove 34 is provided on the outer surface of the head 12b of the bolt 12 to fit the lead wire 14 drawn out from the lead hole 18.

This groove 34 is formed at least in the drawing hole 18.
The head 12b extends from
The groove 23 in which the conductive wire 14 is fitted is filled with the adhesive 23.

According to the second embodiment, it is possible to prevent the portion of the conductor 14 wound around the head 12b of the bolt 12 from projecting outward from the head 12b. Thus, it is possible to prevent an undesired external force from acting on the conductive wire 14 at the part wound around the head 12b, and to improve the appearance of the load measuring tool 11 '.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

[0031]

As described above, according to the first aspect of the present invention, when the strain gauge is provided on the bolt, the conducting wire connected to the strain gauge is fixed to the bolt.
Even if an external force acts on the conductive wire, the external force does not undesirably act on the strain gauge, and accurate load measurement by the strain gauge can be performed. Moreover, even when the strain gauge is mounted, the bolt can be rotated to fasten the two members, and the load measuring tool can be easily configured using bolts widely used as general commercial products. it can.

According to the second aspect of the present invention, the load measuring tool also has a function of fastening between the dummy constituent members, so that the number of components is reduced and the structure is simplified when measuring the dummy load. Can be.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a load measuring device according to a first embodiment.

FIG. 2 is a plan view as viewed in the direction of arrow 2 in FIG.

FIG. 3 is a vertical sectional side view of a dummy.

FIG. 4 is a rear view of the spine and ribs as viewed from the direction of arrow 4 in FIG. 3;

FIG. 5 is a sectional view taken along line 5-5 in FIG. 4;

FIG. 6 is a sectional view taken along line 6-6 in FIG. 3;

FIG. 7 is a sectional view taken along line 7-7 of FIG. 3;

FIG. 8 is a side view of a hip joint.

FIG. 9 is a longitudinal sectional view of a load measuring device according to a second embodiment.

FIG. 10 is a sectional view taken along line 10-10 of FIG. 9;

[Explanation of symbols]

 11, 11 '... load measuring tool 12 ... bolt 12a ... screw shaft part 12b ... head 13 ... strain gauge 14 ... lead wire 15 ... male screw 16 ... tool Mating hole 17 ... storage hole 18 ... draw-out hole 19 ... first through hole 20 ... second through hole 21 ... hexagon wrench as a rotary operation tool 22 ... adhesive 24. ..Dummy 25 ... Spine part as dummy constituent member 26 ... Rib part as dummy constituent member 28 ... Cervical vertebra part as dummy constituent member 29 ... Lumbar vertebra as dummy constituent member Part 30: Pelvic part as dummy constituent member 31: Hip joint as dummy constituent member

Claims (2)

[Claims] A male screw (1) is provided at least on the outer periphery on the tip side.
At the base end of the screw shaft portion (12a) where 5) is engraved, there is provided a bottomed tool engaging hole (16) opened on the opposite side to the screw shaft portion (12a). A bolt (12) having a head (12b) formed larger in diameter than (12a) and integrally and coaxially connected thereto is provided with a bottomed storage hole coaxially connected to the tool engagement hole (16). (17) is provided, and the distance from the open end of the tool engagement hole (16) is required to insert and engage the rotary operation tool (21) in the tool engagement hole (16). The inner surface of the tool engagement hole (16) and the head (12) are set at a position set to be larger than the required distance.
b) a lead-out hole (18) connecting the outer surfaces and a bolt (1).
2) coaxially disposed on one diameter line of the bolt (12) at substantially the same position as the drawing hole (18) along the axis of 2) and the inner surface of the tool engaging hole (16) and the head (12b). First and second through holes (19, 2) connecting the outer surfaces, respectively.
0) is provided, and a conducting wire (14) connected to the strain gauge (13) housed in the housing hole (17) is drawn out to the outside from the drawing hole (18), and the outer periphery of the head (12b). And the first and second through holes (1
9, 20), and an adhesive (22) that fills the strain gauge (13) and a portion of the conductor (14) that is arranged in the tool engagement hole (16) is applied to the tool engagement hole (16). A load measuring tool characterized in that the distance from the open end of (1) is not less than the required distance and is filled in the tool engagement hole (16) and the storage hole (17). 2. A load measuring device according to claim 1, wherein said dummy member is used for a vehicle crash test.
5, 26; 25, 28; 25, 29; 30, 31) are fastened to each other.