JP3523083B2 - Load measuring tool and dummy load measuring device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load measuring tool for measuring a load by using a bolt for fastening two members to which a load acts in a mutually displacing direction.

[0002]

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

[0003]

However, in the above-mentioned prior art, the conductive wire connected to the strain gauge is still pulled out from the head end face of the bolt, and when an external force acts on the conductive wire, the strain is distorted from the conductive wire. Unnecessary tensile load may act on the gauge.

The present invention has been made in view of the above circumstances, and in constructing a load measuring tool using a bolt, even if an external force acts on the conductor, an unnecessary external force does not act on the strain gauge. In this way, a load measuring tool having a simple structure that enables precise load measurement, and a dummy load measuring device configured to measure a dummy load used in a vehicle collision test using the load measuring tool are provided. The purpose is to provide.

[0005]

In order to achieve the above object, a load measuring tool according to the invention of claim 1 is characterized in that at least the base end of a screw shaft portion having a male screw engraved on the outer circumference on the tip side is A bolt having a bottomed tool engaging hole opened on the side opposite to the screw shaft portion and having a diameter larger than that of the screw shaft portion is integrally and coaxially connected to the bolt. With a bottomed storage hole that is coaxial with the tool engagement hole,
The inner surface of the tool engagement hole and the inner surface of the tool engagement hole at a position where the distance from the opening end of the tool engagement hole is set to be larger than the necessary distance required for inserting and engaging the rotary operation tool in the tool engagement hole. Between the inner surface of the tool engaging hole and the outer surface of the head, which is coaxially arranged on one diameter line of the bolt at a position substantially the same as the hole along the axis of the bolt and connecting the outer surfaces of the head. First and second through holes that connect the first and second through holes, respectively, and a lead wire connected to the strain gauge accommodated in the accommodation hole is drawn out from the extraction hole to the outside and wound around the outer periphery of the head portion. An adhesive that is inserted through the second through hole and fills the strain gauge and the portion of the conductor wire that is arranged in the tool engagement hole has a distance from the opening end of the tool engagement hole that is equal to or greater than the required distance. For dowel and storage holes Hama is the fact characterized.

According to this structure, the conductive wire connected to the strain gauge is drawn out from the drawing hole, wound around the outer circumference of the head, and further inserted into the first and second through holes, and then engaged with the tool. The conductive wire in the tool engagement hole is filled with the adhesive that fills the holes and storage holes, so the conductive wire is fixed to the bolt, and even if external force acts on the conductive wire, undesired external force acts on the strain gauge. It is possible to perform precise load measurement using a strain gauge. Moreover, the adhesive is filled in the tool engagement hole and the storage hole such that the distance from the opening end of the tool engagement hole is equal to or more than the necessary distance required to engage the rotary operation tool in the tool engagement hole. Therefore, the two members can be fastened by rotating the bolt even when the strain gauge is attached. Further, at least at the base end of the screw shaft portion on which the male screw is engraved on the outer periphery on the tip side, a bottomed tool engaging hole opened on the opposite side to the screw shaft portion is provided, and A bolt having a large-diameter head that is integrally and coaxially connected is widely used as a general commercially available product. It is possible to construct a load measuring tool using a bolt for fastening two members by drilling the first and second through holes, inserting a strain gauge, routing a conductor and filling an adhesive. Is.

A dummy load measuring device according to a second aspect of the present invention is the load measuring tool according to the first aspect, characterized in that dummy component members used in a vehicle collision test are fastened together. According to such a configuration, the load measuring tool also has a function of fastening the dummy constituent members together, so that the number of parts can be reduced and the configuration can be simplified in measuring the dummy load.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below based on the embodiments of the present invention shown in the accompanying drawings.

1 to 8 show a first embodiment of the present invention. FIG. 1 is a vertical sectional view of a load measuring tool, FIG. 2 is a plan view taken along the arrow 2 in FIG. 1, and FIG. Vertical side view, FIG. 4 is FIG.
4 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. Fig. 7 is a sectional view taken along line -7, and Fig. 8 is a side view of the hip joint portion.

First, in FIGS. 1 and 2, the load measuring tool 11 comprises a bolt 12 and a strain gauge 13 embedded and fixed in the bolt 12, and a conductive wire 14 connected to the strain gauge 13 is fixed to the bolt 12. To be done.

The bolt 12 has a threaded shaft portion 12a having a male screw 15 engraved on at least the outer periphery on the tip side, and a circular cross-section having a larger diameter than the threaded shaft portion 12a.
A head 12 formed integrally and coaxially with the base end of 2a.
b, and the bottomed tool engaging 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 portion 12b are formed. At the position where the draw-out hole 18 connecting the outer surfaces and the axis of the draw-out hole 18 make an angle,
1b which is coaxially arranged on one diameter line of 2b 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 pull-out hole 18 is the tool engagement hole 1
At a position where the distance L2 from the opening end of 6 is set to be larger than the necessary distance L1 required to insert and engage the hexagonal wrench 21 which is a rotary operation tool into the tool engagement hole 16, It is provided on the head 12b of twelve. Further, the first and second through holes 19 and 20 are arranged such that the position along the axis of the bolt 12 is substantially the same as the lead hole 18 and the head portion 12 is formed.
b.

The strain gauge 13 is accommodated in the accommodating hole 17, and the conductor wire 14 connected to the strain gauge 13 is provided.
Is drawn out of the head portion 12b from the pull-out hole 18, wound around the outer periphery of the head portion 12b, and further inserted into the first and second through holes 19, 20. Moreover, the strain gauge 13 accommodated in the accommodation hole 17, the portion of the conductor 14 disposed 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 filled in the adhesive 22 filled in the tool engagement hole 16 and the storage hole 17, and the adhesive 22 has a distance L3 from the opening end of the tool engagement hole 16 to the above-mentioned range. Tool engagement hole 16 with required distance L1 or more
And the storage hole 17 is filled.

The portion of the conducting wire 14 wound around the head 12b of the bolt 12 is also adhered to the bolt 12 with an adhesive 23.

In FIG. 3, a dummy 24 is used in a vehicle collision test, and the load measuring tool 11 is used as follows in order to fasten the constituent members of the dummy 24.

That is, as shown in FIGS. 4 and 5,
Spine 2 which is one of the constituent members of the dummy 24
The plurality of rib portions 26, 26, which are constituent members of the dummy 24, are arranged on the back portion of the dummy 5 so as to be vertically arranged at intervals.
The bolts 12 in each load measuring tool 11 are inserted into the rib portions 26 and the spine portion 25 from the back side at two places of the rib portions 26, 26, and the nuts 27 are attached to the spine. The bolts 12 are screwed into contact with the front surface of the portion 25.

Thus, the spine portion 25 and each rib portion 2
By using the load measuring tool 11 between the 6, 6, ..., It is possible to individually measure the load acting on each rib portion 26, 26 .., and the impact load acting on the chest of the dummy 24 can be measured. It is possible to contribute to improvement of analysis accuracy.

Further, 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.
a is fastened to the upper end of the spine portion 25 at four places, and the load measuring tools 11 ... It can be obtained using the measured values of the load measuring tool 11.

Further, as shown in FIG. 7, a flange 29 provided on the upper end of the lumbar portion 29, which is a component of the dummy 24.
a is fastened to the lower end of the spine portion 25 at four places, and the load measuring tools 11 ... Are used to fasten the four places, and the impact loads acting on the joints of the lumbar portion 29 and the spine portion 25 are It can be obtained using the measured values of the load measuring tool 11.

Further, as shown in FIG. 8, the pelvis portion 30 which is a constituent member of the dummy 24 is connected to the femur portion 32 through the hip joint portion 31 which is a constituent member of the dummy 24.
The flange 31a of the hip joint 31 has the pelvis 3
No. 4 is fastened at four locations, and the load measuring tools 11 ... Are used to fasten the four locations. Therefore, the pelvis 3
The impact load acting between 0 and the hip joint part 31 can be obtained by using the measured values of the respective load measuring tools 11. In particular,
In the collision test of the vehicle, the pelvis 30 and the femur 32
May interfere with each other, and by using the measurement values of the load measuring tools 11 ... Between the pelvis portion 30 and the hip joint portion 31, it is determined whether such interference has occurred and the interference It becomes possible to gain strength,
It becomes 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 tool 11 in which the strain gauge 13 is embedded and fixed in the bolt 12, the lead wire 14 connected to the strain gauge 13 is pulled out from the lead hole 18 to the outside. Is wound around the head 12b of the bolt 12, and the first and second
After being inserted into the through holes 19 and 20, the tool engagement hole 16 is filled with the adhesive 22 filled in the storage hole 17 and the tool engagement hole 16.
Since the inner conductor wire is buried, the conductor wire 14 is fixed to the bolt 12. Therefore, even if an external force acts on the conductor 14, the strain gauge 13 does not undesirably act, and the strain gauge 13 can measure a precise load.

Moreover, the adhesive 22 filled in the tool engagement hole 16 and the storage hole 17 engages the hexagonal wrench 21 in the tool engagement hole 16 for the distance L3 from the opening end of the tool engagement hole 16. Since the tool engagement hole 16 and the storage hole 17 are filled with the required distance L1 or more required for the two, it is possible to rotate the bolt 12 and fasten the two members even when the strain gauge 13 is mounted. .

A head 12a having a bottomed tool engaging hole 16 opened on the opposite side of the screw shaft portion 12a is integrally and coaxially connected to the base end of the screw shaft portion 12a. 12 is widely used as a general commercially available product, and such a commercially available bolt 12 has a storage hole 17,
Draw-out hole 18 and first and second through holes 19, 2
0 is punched, strain gauge 13 is inserted, lead wire 14 is drawn, adhesive 22 is filled, and adhesive 2 is used.
By performing the coating operation of 3, it is possible to configure the load measuring tool 11 using the bolt 12 that fastens the two members.

Moreover, the spine portion 25 and the rib portions 26, which are constituent members of the dummy 24 used in the vehicle crash test, ...
Between the spine 25 and the cervical 28, between the spine 25 and the lumbar 29, and the pelvis 30 and the hip 31.
Since the spaces are fastened by using the load measuring tools 11, ..., The load measuring tools 11 ... also have a function of fastening the constituent members of the dummy 24, and reduce the number of parts when measuring the load of the dummy 24. The configuration can be simplified.

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

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 portion 12b are formed. At the position where the drawing hole 18 connecting the outer surfaces and the axis of the drawing hole 18 form an angle,
The bolt 12 is provided with the first and second through holes 19 and 20 coaxially arranged on one diameter line of b and connecting the inner surface of the tool engagement hole 16 and the outer surface of the head portion 12b, respectively. The structure is similar to that of the first embodiment, but the structure is different from that of the first embodiment in that a groove 34 is provided on the outer surface of the head portion 12b of the bolt 12 into which the conducting wire 14 drawn from the drawing hole 18 is fitted.

This groove 34 has at least the drawing hole 18
From the first through hole 19 to the head 12b
The groove 34 in which the conducting wire 14 is fitted is filled with the adhesive 23.

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

Although the embodiments of the present invention have been described in detail above, 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 claims. It is possible to do.

[0031]

As described above, according to the first aspect of the invention, when the strain gauge is provided on the bolt, the conductor wire connected to the strain gauge is fixed to the bolt.
Even if an external force acts on the conducting wire, the strain gauge does not undesirably exert an external force, and it is possible to measure the load accurately by the strain gauge. Moreover, the two members can be fastened by rotating the bolt even with the strain gauge attached, and the load measuring tool can be easily configured using the bolt widely used as a general commercial product. it can.

According to the second aspect of the present invention, the load measuring tool also has a function of fastening the dummy constituent members together, so that the number of parts can be reduced and the structure can be simplified in measuring the dummy load. You can

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a load measuring tool according to a first embodiment.

FIG. 2 is a plan view taken along the arrow 2 of FIG.

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

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

5 is a sectional view taken along line 5-5 of FIG.

6 is a sectional view taken along line 6-6 of FIG.

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

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

FIG. 9 is a vertical sectional view of a load measuring tool according to a second embodiment.

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

[Explanation of symbols]

11, 11 '... Load measuring tool 12 ... Bolt 12a ... Screw shaft 12b ... Head 13 ... strain gauge 14 ... Conductor 15 ... Male screw 16: Tool engagement hole 17 ... Storage hole 18 ... Drawer hole 19: First through hole 20: second through hole 21 ... Hexagonal wrench as a rotary operation tool 22 ... Adhesive 24 ... dummy 25 ... Spine as a dummy component 26 ... Ribs as a component of the dummy 28 ... Cervical vertebra as a dummy component 29 ... Lumbar vertebra as a dummy component 30 ... Pelvis part as a dummy component 31 ... Hip joint as a dummy component

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01L 5/00 G01L 1/22 G01B 7/16

Claims (2)

(57) [Claims] 1. A male screw (1
5) has a bottomed tool engaging hole (16) opened on the side opposite to the screw shaft portion (12a) at the base end of the screw shaft portion (12a). A head (12b) having a diameter larger than that of (12a) is integrally and coaxially connected to a bolt (12), and 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) into the tool engagement hole (16). At a position set larger than the required distance, the inner surface of the tool engagement hole (16) and the head (12)
b) the pull-out hole (18) connecting the outer surfaces and the bolt (1
2) The bolt (12) is coaxially arranged on the one diameter line of the bolt (12) at substantially the same position as the pull-out hole (18) along the axis of (2) so that the inner surface of the tool engagement hole (16) and the head portion (12b). First and second through holes (19, 2) connecting the outer surfaces, respectively.
0) is provided, a conductor (14) connected to the strain gauge (13) housed in the housing hole (17) is drawn out from the drawing hole (18) to the outside, and the outer circumference of the head (12b) is also provided. The first and second through holes (1
The adhesive (22) which is inserted through the strain gauge (13) and the conductive wire (14) to fill the portion of the conductive wire (14) arranged in the tool engagement hole (16) is inserted into the tool engagement hole (16). ) Is filled in the tool engagement hole (16) and the storage hole (17) with the distance from the opening end of the above) being equal to or greater than the required distance. 2. The load measuring tool according to claim 1, wherein a component (2) of a dummy (24) used in a vehicle collision test.
5, 26; 25, 28; 25, 29; 30, 31) are fastened together.