WO2015155956A1 - 歪センサおよびそれを用いた荷重検出装置 - Google Patents
歪センサおよびそれを用いた荷重検出装置 Download PDFInfo
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- WO2015155956A1 WO2015155956A1 PCT/JP2015/001820 JP2015001820W WO2015155956A1 WO 2015155956 A1 WO2015155956 A1 WO 2015155956A1 JP 2015001820 W JP2015001820 W JP 2015001820W WO 2015155956 A1 WO2015155956 A1 WO 2015155956A1
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- strain
- strain sensor
- sensor according
- fixing portion
- detection element
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2287—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges constructional details of the strain gauges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
- G01L1/2218—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being of the column type, e.g. cylindric, adapted for measuring a force along a single direction
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
- G01L1/2231—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being disc- or ring-shaped, adapted for measuring a force along a single direction
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/225—Measuring circuits therefor
- G01L1/2262—Measuring circuits therefor involving simple electrical bridges
Definitions
- the present invention relates to a strain sensor that measures strain generated in a strain generating body when a load is applied and detects the magnitude of the load, and a load detection device using the strain sensor.
- FIG. 18 is a perspective view of a conventional strain sensor 1.
- FIG. 19 is an enlarged view of the outer peripheral surface of the strain body 2 of the strain sensor 1.
- the strain sensor 1 includes a strain generating body 2 and first to fourth resistance elements (hereinafter referred to as resistance elements) 3A, 3B, 3C, and 3D.
- the strain body 2 is distorted by a load.
- the resistance elements 3A, 3B, 3C, and 3D are disposed on the outer peripheral surface of the strain generating body 2.
- the resistance values of the resistance elements 3A, 3B, 3C, and 3D change according to the amount of strain.
- a signal processing circuit (not shown) for detecting the strain amount of the strain generating body 2 is connected to the resistance elements 3A, 3B, 3C, and 3D.
- the strain body 2 has a cylindrical shape having a cavity (not shown) in the axial direction, and a screw portion 4 is disposed in the axial direction of the strain body 2 so as to sandwich the strain body 2.
- the strain body 2 and the screw portion 4 are joined and integrated by welding.
- a first output electrode (hereinafter referred to as an output electrode) 5A and a second output electrode (hereinafter referred to as an output electrode) 5B facing each other are disposed on the circumferential surface of the strain body 2.
- a power supply electrode 6 and a ground electrode 7 are provided between the output electrodes 5A and 5B. Each of these electrodes is connected to the pad electrode 8.
- the output electrodes 5A and 5B, the power supply electrode 6, and the ground electrode 7 are linear Ag electrodes formed by baking silver.
- the output electrodes 5A and 5B are opposed to the strain generating body 2 in the axial direction.
- the power supply electrode 6 and the ground electrode 7 are arranged on substantially the same straight line.
- the power supply electrode 6 and the ground electrode 7 are disposed substantially parallel to the output electrodes 5A and 5B.
- the resistive element 3A is formed so as to connect the ground electrode 7 and the output electrode 5A
- the resistive element 3B is formed so as to connect the ground electrode 7 and the output electrode 5B
- the resistance element 3C is formed so as to connect the power supply electrode 6 and the output electrode 5A
- the resistance element 3D is formed so as to connect the power supply electrode 6 and the output electrode 5B.
- Resistive elements 3A, 3B, 3C, and 3D have a portion 10 between output electrode 5A and output electrode 5B, and output electrodes 5A and 5B, except for portion 90 where power supply electrode 6 and ground electrode 7 face each other.
- the power electrode 6 and the ground electrode 7 are covered with a strain resistor (for example, Patent Document 1).
- FIG. 20 is a cross-sectional view of another conventional strain sensor 11, and FIG. 21 is a partially enlarged view of the strain sensor 11.
- the strain sensor 11 includes a strain generating body 12 configured in a cylindrical shape by precipitation hardening stainless steel.
- a power electrode made of Ag, a first output electrode, a second output electrode, and a ground (GND) electrode (all not shown) are provided on the outer surface of the strain generating body 12 so as to be close to each other. Yes.
- a second lower strain detection element (hereinafter, detection element) 14 electrically connected to the second output electrode is provided on the side opposite to the detection element 13.
- a first upper strain detecting element (hereinafter referred to as a detecting element) 350 electrically connected to the detecting element 13 and the first output electrode is provided on the upper outer surface of the strain generating body 12 above the detecting element 13. It has been.
- a second upper strain detecting element (hereinafter referred to as “the second upper strain detecting element”) electrically connected to the detecting element 14 and the second output electrode.
- Detection element) 16 is provided.
- the detection elements 13, 14, 350, and 16 constitute a bridge circuit.
- an extension portion 17 is provided inside the cylindrical strain body 12, and a column portion 18 is provided on the distal end side of the extension portion 17.
- An upper mounting portion (not shown) is provided at the upper end of the strain body 12 with a gap 19 therebetween.
- the lower attachment portion (not shown) supports a column portion 18 provided at the tip of the extension portion 17 in the strain body 12.
- the upper attachment portion and the lower attachment portion constitute a support member (not shown).
- a metal pressing member 21 formed of a shaft is fixed to the inner surface of the upper end side of the strain body 12 and is configured to move in the longitudinal direction of the strain body 12.
- a gap 20 is provided between the upper mounting portion and the pressing member 21, and the upper mounting portion serves as a stopper.
- the resin case 22 has a caulking portion 23, and the lower attachment portion of the support member is fixed to the case 22 by caulking the tip of the caulking portion 23.
- the case 22 is provided with a circuit board 24 made of glass epoxy, and the circuit board 24 is electrically connected to the power supply electrode, the first output electrode, the second output electrode, and the GND electrode in the strain generating body 12. ing. Further, the circuit board 24 is provided with a processing circuit 25 constituted by an integrated circuit (IC). The processing circuit 25 includes a first lower strain detection element 13, a second lower strain detection element 14, a first upper strain detection element 350, a second upper strain detection element 16, and a circuit pattern 18 in the strain body 12. The output signal of the bridge circuit is processed.
- the case 22 is provided with a connector portion 27 having connector terminals 26. The connector terminal 26 is electrically connected to the circuit board 24 and outputs an output signal to the outside (for example, Patent Document 2).
- the present invention provides a strain sensor that obtains a large output signal, reduces the influence of the axial force generated in the strain sensor, and improves the strain detection accuracy.
- the strain sensor of the present invention includes a cylindrical strain generating body extending along the axial direction, a first fixing portion, a second fixing portion, and a strain detecting element.
- the first fixing portion is connected to the strain body at the first connection portion, and extends in the axial direction from the opening at the first end of the strain body.
- the first fixing portion has a first engaging portion that is fixed to the detection target.
- the second fixing portion is connected to the strain generating body at the second connecting portion, and a gap is sandwiched between the strain generating body and the opening from the second end of the strain generating body in a direction opposite to the first fixing portion. It is extended.
- the second fixing portion has a second engaging portion that is fixed to the detection object.
- the strain detecting element is provided on the outer peripheral surface of the strain generating body. The strain detection element is arranged such that the center of the strain detection element is located on the side where the second fixing portion is located rather than the center of the gap with respect to the axial direction.
- the axial force when the strain sensor is attached to the detection target can be reduced, and the detection accuracy of the strain sensor can be improved.
- Sectional drawing of the strain sensor in Embodiment 1 of this invention 1 is a developed view of the outer peripheral surface of the strain generating body of the strain sensor shown in FIG.
- FIG. 2 is a circuit diagram of a strain detecting element provided in the strain generating body shown in FIG.
- Sectional drawing of the strain sensor in Embodiment 2 of this invention The elements on larger scale which show the state which the distortion sensor shown in FIG. 6 deform
- strain sensors according to various embodiments of the present invention will be described with reference to the drawings.
- components having the same configurations as those of the preceding embodiments are denoted by the same reference numerals, and detailed description may be omitted.
- the configuration unique to each embodiment may be combined with the configuration of other embodiments without departing from the spirit of the invention.
- FIG. 1 is a side sectional view of a strain sensor 31 according to Embodiment 1 of the present invention.
- FIG. 2 is a development view of the outer peripheral surface of the strain body 32 of the strain sensor 31.
- the strain sensor 31 includes a cylindrical strain generating body 32 extending along the direction of the shaft 34, a first fixing portion 35, a second fixing portion 37, and a strain detecting element 125.
- the first fixing portion 35 is connected to the inside of the strain body 32 at the first connection portion 33, and extends in the direction of the shaft 34 from the opening at the first end of the strain body 32.
- the first fixing portion 35 has a first engaging portion 127 that is fixed to a detected body (not shown).
- the second fixing portion 37 is connected to the inside of the strain generating body 32 at the second connecting portion 36, and the strain generating body 32 is formed in the direction opposite to the first fixing portion 35 from the opening at the second end of the strain generating body 32. With a gap 43 between them.
- the second fixing portion 37 has a second engaging portion 126 that is fixed to the detection target.
- the strain detection element 125 is provided on the outer peripheral surface of the strain body 32.
- the first engagement portion 127 and the second engagement portion 126 are constituted by screws. By tightening the first engaging portion 127 and the second engaging portion 126 to the detected body so that the washer (not shown) is in contact with the first surface 38 and the second surface 40, the strain sensor 31 is Fixed to the object to be detected.
- extension part 42 extends from the second connection part 36 in the same direction as the direction in which the second fixing part 37 extends. This will be described later.
- the first fixed portion 35 has a first thick portion 39 that protrudes in a direction orthogonal to the direction of the shaft 34
- the second fixed portion 37 is a second thick wall that protrudes in a direction orthogonal to the direction of the shaft 34.
- Part 41 is provided.
- the first thick portion 39 has a first surface 38 orthogonal to the direction of the shaft 34 near the first engagement portion 127, and the second thick portion 41 is close to the second engagement portion 126.
- the second surface 40 is orthogonal to the direction of 34.
- the strain detection element 125 is disposed in a position closer to the second fixing portion 37 than the center of the gap 43 in the direction of the axis 34. That is, the strain detection element 125 is arranged so that the center of the strain detection element 125 is located on the side where the second fixing portion 37 is located with respect to the center of the gap 43 in the direction of the axis 34.
- the strain detection element 125 includes a first strain resistance pattern 48, a second strain resistance pattern 49, a third strain resistance pattern 50, and a fourth strain resistance pattern 51.
- the patterns 48 to 51 are referred to.
- the pattern 48 is connected between the power supply electrode 46 and the first output electrode 44, and the pattern 49 is connected between the ground electrode 47 and the first output electrode 44.
- the pattern 50 is connected between the power supply electrode 46 and the second output electrode 45, and the pattern 51 is connected between the ground electrode 47 and the second output electrode 45.
- the pattern 48 and the pattern 50 are arranged closer to the first fixed portion 35 than the pattern 49 and the pattern 51.
- the strain detection element 125 and the circuit pattern constitute a full bridge circuit shown in FIG.
- the strain body 32 is made of a metal such as stainless steel. First, after printing a glass paste on the outer peripheral surface of the strain generating body 32, the strain generating body 32 is baked at about 550 ° C. for about 10 minutes, thereby forming an insulating coating (not shown). Next, a silver paste is printed on the insulating film, and the strain body 32 is baked at about 550 ° C. for about 10 minutes, thereby forming a circuit pattern. Further, a resistance paste is printed on the insulating film, and the strain body 32 is baked at about 550 ° C. for about 10 minutes, whereby patterns 48 to 50 are formed.
- the first fixing part 35 and the second fixing part 37 may be formed by welding and joining to the cylindrical strain body 32 or by processing members made of the same material.
- a strain resistance type strain sensor 31 that detects a strain amount of the strain generating body 32 by a change in resistance value will be described.
- a method in which the capacity changes may be used. This also applies to Embodiments 2 and 3 described later.
- FIG. 4 is a partially enlarged view showing deformation of the strain sensor 31 when a load is applied to the strain body 32.
- a load that pushes the strain generating body 32 in the direction of the shaft 34 is applied to the strain sensor 31 connected to the detection target body via the first fixing portion 35 or the second fixing portion 37.
- the strain body 32 is deformed by this load.
- a shear load f is applied to the second fixed portion 37. Due to the shear load f, a moment force acts on the outer surface of the strain body 32, and tensile stress is applied to the strain body 32 between the first connection portion 33 and the second connection portion 36. As a result, at the portion between the first connection portion 33 and the second connection portion 36, the strain generating body 32 is deformed so as to be displaced outward, and the extending portion 42 is deformed so as to be displaced inward.
- the magnitude of the load F can be measured by detecting the strain generated in the strain generating body 32 by applying the load F.
- the strain generating body 32 is also deformed when the strain sensor 31 is attached to the detected body by the first fixing portion 35 and the second fixing portion 37 via the washer.
- a force pulling in the opposite direction along the direction of the shaft 34 is applied from the first fixing portion 35 and the second fixing portion 37 to the strain generating body 32. That is, a force (hereinafter described as an axial force) that extends in the vertical direction in FIG.
- the horizontal axis in FIG. 5 indicates the position of the strain generating body 32 in the direction of the axis 34 of the strain generating body 32 with the tip of the extending portion 42 being 0.0 mm.
- the vertical axis indicates the magnitude of the distortion generated on the outer peripheral surface of the strain generating body 32, and is normalized by assuming that the value of the position (about 4.1 mm) at which the absolute value of the distortion magnitude is maximum is 1. In the vertical axis, the positive side indicates tensile stress, and the negative side indicates compressive stress.
- FIG. 5 shows the measurement results when the strain body 32 having a length from the tip P1 of the extending portion 42 shown in FIG. 1 to the end P2 near the first fixing portion 35 is 5.0 mm. It is.
- the position 5.0 means the end portion P2.
- FIG. 5 shows a strain distribution when a load of 1 kN is applied in the direction from the first fixing portion 35 to the shaft 34 as a strain distribution A, and a strain sensor 31 is applied to the detection object via a washer with a force of 10 kN.
- a strain distribution B is shown as a distribution of strain generated in the strain generating body 32 by the axial force when is fixed.
- the length of the first connecting portion 33 is 1.2 mm
- the length of the second connecting portion 36 is 2.0 mm
- the length of the extending portion 42 is 1.0 mm.
- the 0.0 mm to 1.0 mm portion is the extension portion 42
- the 1.0 mm to 3.0 mm portion is the second connection portion 36
- the 3.0 mm to 3.8 mm portion is the gap 43, 3.8 mm to
- the 5.0 mm portion is the first connection portion 33.
- the central part of the pattern 48 and the pattern 50 in the direction of the axis 34 is at a position of 2.6 mm in FIG. 5, and the central part of the pattern 49 and the pattern 51 in the direction of the axis 34 is at a position of 1.6 mm.
- the washer fastens the strain sensor 31 so as to contact the first surface 38 and the second surface 40. Therefore, an axial force is applied so as to pull the strain body 32 in the direction of the shaft 34 with the first surface 38 and the second surface 40 as a reference. At this time, the closer to the first surface 38 and the second surface 40 where the axial force is applied, the larger the axial force is applied and the strain generating body 32 is greatly distorted.
- the portion where the air gap 43 is provided is a portion where the air gap 43 is provided because the thickness in the direction orthogonal to the shaft 34 is smaller than the first connection portion 33 and the second connection portion 36. The strain body 32 is easily distorted.
- the influence (distortion) of the axial force generated when the strain sensor 31 is attached to the detection target is the end portion (4. 1 mm position).
- the strain is less than half (about ⁇ 0.4) at the intermediate point between the first connection portion 33 and the second connection portion 36 (position of 3.4 mm), and the influence of the axial force becomes closer as the second connection portion 36 is approached. It is reduced and becomes 0 at the end portion (position of 3.0 mm) near the gap 43 of the second connection portion 36.
- the strain distribution A indicates the strain generated in the strain generating body 32 by applying the compressive load F in the direction from the first fixed portion 35 to the shaft 34 after the strain sensor 31 is attached to the detection target.
- the distortion is the smallest at the end portion (position of 3.0 mm) near the first connection portion 33.
- the magnitude of the distortion is about 0.6, which is sufficiently larger than the distortion caused by the axial force. That is, in the vicinity of the end portion of the gap 43 near the first connection portion 33, it is possible to reduce the influence of the axial force and detect the distortion caused by the load with high sensitivity.
- the strain detecting element 125 at a position closer to the second connecting portion 36 than the middle (3.4 mm) between the first connecting portion 33 and the second connecting portion 36. That is, the strain detection element 125 may be arranged so that the center of the strain detection element 125 is located on the side where the second fixing portion 37 is located with respect to the center of the gap 43 in the direction of the axis 34. As a result, the influence of the axial force is reduced, and a large strain can be detected when a compressive load is applied. Therefore, the detection accuracy of the strain sensor 31 can be improved.
- the strain detection element 125 in the direction of the shaft 34 so that the center thereof is in the vicinity of the end portion of the second connection portion 36 near the gap 43 (position of 2.9 mm), the influence of the axial force is exerted. Can be set to 0, and the detection accuracy of the strain sensor 31 can be improved.
- the patterns 48 and 50 of the strain detecting element 125 are provided at the position (2.9 mm position) where the axial force is 0 in the second connection portion 36, and the patterns 49 and 51 are extended portions of the second connection portion 36. It may be provided at a position closer to 42 (position of 1.0 mm to 1.3 mm), that is, on the side opposite to the gap 43. Alternatively, the patterns 49 and 51 may be provided on the extending portion 42 (position of 0.0 mm to 1.0 mm). With these arrangements, tensile stress is applied to the patterns 48 and 50, and compressive stress is applied to the patterns 49 and 51. Therefore, a large detection signal can be obtained and the detection sensitivity of the strain sensor 31 can be improved.
- the absolute value of the distortion generated when a compressive load is applied at a position near the extending portion 42 of the second connecting portion 36 is maximum (minus minus). Therefore, the detection sensitivity of the strain sensor 31 can be improved by providing the patterns 49 and 51 at this position (position of 1.2 mm).
- the first surface 38 and the second surface 40 function as a first seat surface and a second seat surface, respectively, when the object to be detected is tightened.
- the first thick part 39 and the second thick part 41 may be provided on the entire outer peripheral surface of the first fixing part 35 and the second fixing part 37, respectively, or only on a part thereof.
- the strain detection element 125 at a position where the influence of the axial force generated when the strain sensor 31 is attached to the detection target is small, the detection accuracy of the strain sensor 31 can be improved.
- a full bridge circuit including the pattern 48, the pattern 49, the pattern 50, and the pattern 51 is configured as the strain detection element 125.
- the present invention is not limited to this. It is sufficient that the strain generated in the strain generating body 32 can be detected by detecting a resistance change or the like. That is, the patterns 48 to 51 are examples of first to fourth strain detection elements. This also applies to the following second and third embodiments.
- FIG. 6 is a side sectional view of the strain sensor 120 according to Embodiment 2 of the present invention.
- the strain sensor 120 includes a strain body 32, a first fixing portion 35, a second fixing portion 37, and a strain detection element 125.
- the first fixing portion 35 is connected to the inside of the strain body 32 at the first connection portion 33, and extends in the direction of the shaft 34 from the opening at the first end of the strain body 32.
- the second fixing portion 37 is connected to the inside of the strain generating body 32 at the second connecting portion 36, and the strain generating body 32 is formed in the direction opposite to the first fixing portion 35 from the opening at the second end of the strain generating body 32. With a gap 43 between them.
- the first fixing portion 35 is joined so as to fill the opening at the first end of the strain body 32
- the second fixing portion 37 is joined so as to fill the opening at the second end.
- a gap 43 is provided between the first fixing portion 37 and the second fixing portion 37.
- the first fixing portion 35 has a first engaging portion 127 fixed to a detected body (not shown), and the second fixing portion 37 has a second engaging portion 126 fixed to the detected body.
- the strain detection element 125 is provided on the outer peripheral surface of the strain body 32. The above configuration is the same as that of the strain sensor 31 in the first embodiment.
- the difference between the strain sensor 120 and the strain sensor 31 is that, instead of the first thick portion 39 and the second thick portion 41, the second fixing portion 37 is connected to the second engaging portion 126 and the strain body 32.
- the receiving portion 128 is provided between the second connecting portion 36 and the second connecting portion 36.
- the receiving portion 128 is provided on the entire outer peripheral surface of the second fixing portion 37 from the end portion of the second engagement portion 126 near the strain body 32 to the strain body 32.
- the length L1 of the receiving portion 128 in the radial direction 129 is longer than the length L2 of the second fixing portion 37 in the radial direction 129.
- an attachment hole (not shown) for attaching the strain sensor 120 is provided in the detection object, and the second engagement portion 126 is screwed to the attachment hole. Fix it.
- the length L1 is longer than the length L2, so that the strain sensor 120 can be attached to the detected body without the detected body contacting the strain generating body 32. That is, the receiving part 128 has the same effect as the second thick part 41 in the first embodiment.
- strain detection element 125 The configuration of the strain detection element 125 is as described with reference to FIG. 2 and FIG. The same structure as that of Embodiment Mode 1 can be manufactured in the same manner.
- FIG. 7 is a partially enlarged view showing a state in which a load (for example, a pedaling force) as an input load is transmitted to the strain body 32 of the strain sensor 120 and the strain sensor 120 is deformed.
- a load for example, a pedaling force
- a load is applied to the strain sensor 120 connected to the detection target body in the direction of pushing the strain generating body 32 in the direction of the shaft 34 via the first fixing portion 35 or the second fixing portion 37.
- the strain body 32 is deformed by this load.
- a shear load f is applied to the first fixed portion 35. Due to the shear load f, moment force acts on the outer surface of the strain body 32, and tensile stress is applied between the first connection portion 33 and the second connection portion 36 of the strain body 32.
- the strain body 32 is deformed so as to be displaced outward at a portion between the first connecting portion 33 and the second connecting portion 36 and so that the extending portion 42 is displaced inward. Similar to the first embodiment, the extending portion 42 extends in parallel with the direction of the shaft 34 from the strain body 32 toward the side where the second fixing portion 37 is provided.
- FIG. 8 is a configuration diagram showing the load detection device 139
- FIG. 9 is a cross-sectional view of the load detection device 139 taken along line 9-9.
- the load detection device 139 includes a pedal arm 140, a clevis pin 141, a clevis 142, a strain sensor 120, and an operating rod 143.
- a pedaling force which is an example of a load input from the user, is input to the pedal arm 140 which is an input member.
- the clevis pin 141 is connected to the pedal arm 140 and the clevis 142.
- the clevis pin 141 and the clevis 142 constitute a connecting member.
- the operating rod 143 which is a transmission member, is connected to the connection member via the strain sensor 120 and transmits the pedaling force.
- the clevis 142 and the operating rod 143 are connected by the strain sensor 120.
- the pedaling force input to the pedal arm 140 is transmitted to the operating rod 143 via the strain sensor 120 by the clevis 142 and the clevis pin 141.
- the pedaling force Ft transmitted to the operating rod 143 is transmitted to a brake system (not shown), performs a braking operation according to the input pedaling force, and brakes the vehicle.
- the operating rod 143 and the clevis 142 are provided with mounting holes 144 and 145 for mounting the strain sensor 120, respectively.
- the second engagement portion 126 is screwed to the attachment hole 144, and the first fixing portion 35 is screwed to the attachment hole 145.
- an axial force f1 is applied to the second fixing portion 37 in the direction of the shaft 34. Accordingly, a reaction force f2 is applied to the receiving portion 128 that is in contact with the operating rod 143.
- the strain body 32 When the reaction force f2 is directly transmitted to the strain body 32, the strain body 32 is deformed and the detection accuracy of the strain sensor 120 is lowered. However, the strain sensor 120 is provided with a receiving portion 128. Therefore, the reaction force f ⁇ b> 2 is transmitted from the operating rod 143 to the strain body 32 through the receiving portion 128.
- the receiving portion 128 has a length L from the surface in contact with the operating rod 143 to the strain body 32. Thereby, the rigidity of the transmission path until the reaction force f2 is transmitted to the strain body 32 is increased, and the strain body 32 is difficult to deform. In particular, if the length L is increased, the effect is increased. Therefore, the influence of the axial force f1 generated when the strain sensor 120 is attached to the operating rod 143 is reduced, and the detection accuracy of the strain sensor 120 is improved.
- the reaction force f2 transmitted through the receiving portion 128 is directly generated. It is not transmitted to the distorted body 32. Therefore, the influence of the axial force f1 on the strain generating body 32 can be reduced, and the detection accuracy of the strain sensor 120 is improved. If the length L12 is further shortened, the distance between the strain generating body 32 and the receiving portion 128 is increased, and transmission of the axial force f2 to the strain generating body 32 is reduced. Therefore, the influence of the axial force f1 on the strain body 32 can be further reduced.
- FIG. 10 shows the case where the diameter L12 of the receiving portion 128 is changed in three steps, large, medium, and small, with respect to the strain sensor 120, and the length L from the surface in contact with the operating rod 143 to the strain generating body 32 is changed.
- the change in the magnitude of distortion when a force of 30 kN is applied as the axial force f1 is shown.
- the length of the strain generating body 32 in the radial direction 129 is 18 mm
- the length L11 of the gap 43 in the radial direction 129 is 15.4 mm.
- the diameter L12 of the receiving portion 128 In the “large” where the diameter L12 of the receiving portion 128 is the largest, the diameter L12 is 16 mm, and the diameter L12 is longer than the length L11. When the diameter L12 of the receiving portion 128 is “medium”, the diameter L12 is 14 mm, and the diameter L12 is shorter than the length L11. In the “small” where the diameter L12 of the receiving portion 128 is the smallest, the diameter L12 is 12 mm, and the diameter L12 is even shorter than the “medium”.
- the horizontal axis indicates the length L to the strain generating body 32 with reference to the contact surface with the operating rod 143 of the receiving portion 128.
- the vertical axis indicates the magnitude of the strain of the strain body 32, and the amount of strain generated in the strain body 32 when the diameter of the receiving portion 128 is 14 mm ("medium") and the length L is 1 mm is 1. Standardized.
- the axial force f1 As shown in FIG. 10, when the diameter of the receiving portion 128 is changed from “large” to “medium” and the diameter L12 of the receiving portion 128 is shorter than the length L11 of the gap 43 in the radial direction 129, the axial force f1 The magnitude of the distortion generated in the strain generating body 32 is reduced by about 60%. That is, in this structure, it can be seen that the reaction force f2 generated by the axial force f1 is not easily transmitted directly to the strain body 32. When the diameter of the receiving portion 128 is further reduced to “small”, the magnitude of distortion is further reduced by about 60% compared to “medium”.
- the influence of the axial force f1 on the strain body 32 can be reduced.
- the influence of the axial force f1 on the strain body 32 can be further reduced by further reducing the diameter L12 of the receiving portion 128.
- the diameter of the receiving portion 128 is “small” and the length L is 6 mm, the magnitude of distortion is almost zero.
- the length L of the receiving portion 128 is increased, the rigidity of the transmission path from the position where the axial force f1 is applied to the strain generating body 32 is increased, and the influence of the axial force f1 on the strain generating body 32 is reduced. be able to.
- a screw hole is provided as a mounting hole 145 in the clevis 142, the first fixing portion 35 is screwed to the clevis 142, and the influence of the axial force generated when the clevis 142 is fastened to the strain sensor 120.
- the nut 146 absorbs this.
- the nut 146 receives the axial force f1 at a position away from the strain body 32. Therefore, the influence of the axial force f1 on the strain body 32 can be reduced.
- the distance between the clevis 142 and the strain body 32 can be freely adjusted, and the size of the load detection device 139 can be adjusted. Therefore, it becomes possible to apply to various types of vehicle brake systems.
- FIG. 11 is a cross-sectional view of a load detection device including another strain sensor in the present embodiment.
- the receiving portion 128 By providing the receiving portion 128 at a position away from the strain generating body 32, the influence of the axial force f1 on the strain generating body 32 can be greatly reduced. Further, by providing the receiving portion 128 at a position separated from the strain generating body 32, a region having a shorter length in the radial direction 129 than the receiving portion 128 is formed between the receiving portion 128 and the strain generating body 32. Therefore, the influence of the axial force f1 on the strain body 32 can be further reduced.
- the receiving portion 128 is provided on the second fixing portion 37 later by a method such as welding, the position of the receiving portion 128 can be easily adjusted. Therefore, it becomes easy to apply to various brake systems.
- a projection protruding from the second fixing portion 37 may be provided instead of being provided on the entire outer periphery of the strain generating body 32. Good.
- a reaction force f2 is generated only in one receiving portion 128, and the axial force f1 is not transmitted to the strain generating body 32 in a well-balanced manner, and the axial force depends on the position of the strain generating body 32. The amount of distortion caused by f1 is biased.
- the axial force f1 receiving part 128 can be received in a well-balanced manner. Therefore, the detection accuracy of the strain sensor 120 is further improved.
- the plurality of receiving portions 128 are not provided, but provided so as to surround the outer periphery of the second fixed portion 37, the entire receiving portion 128 can receive the axial force f ⁇ b> 1. Therefore, the detection accuracy of the strain sensor 120 is further improved.
- the load detection device 139 for the brake system has been described. However, if the load detection device 139 detects the load applied in the direction from the first fixed portion 35 to the shaft 34, for example, the weight applied to the vehicle seat. It can also be applied to detection of the above. Note that the same effect can be obtained by using the strain sensor 31 of the first embodiment instead of the strain sensor 120.
- FIG. 12 is a side sectional view of the strain sensor 221 according to Embodiment 3 of the present invention.
- the strain sensor 221 includes a strain body 32, a first fixing portion 35, a second fixing portion 37, and a first strain resistance pattern 48 to a fourth strain resistance pattern 51. Similar to the first and second embodiments, the first strain resistance pattern 48 to the fourth strain resistance pattern 51 constitute the strain detection element 125 shown in FIG.
- the first fixing portion 35 is connected to the inside of the strain body 32 at the first connection portion 33, and extends in the direction of the shaft 34 from the opening at the first end of the strain body 32.
- the second fixing portion 37 is connected to the inside of the strain generating body 32 at the second connecting portion 36, and the strain generating body 32 is formed in the direction opposite to the first fixing portion 35 from the opening at the second end of the strain generating body 32. With a gap 43 between them.
- the first fixing portion 35 has a first engaging portion 127 fixed to a detected body (not shown), and the second fixing portion 37 has a second engaging portion 126 fixed to the detected body.
- the strain detection element 125 is provided on the outer peripheral surface of the strain body 32.
- the above configuration is the same as that of the strain sensor 31 in the first embodiment.
- the difference between the strain sensor 221 and the strain sensor 31 is that a cylindrical stopper 230 is provided on the surface 229 of the first fixing portion 35 facing the gap 43.
- the configuration of the strain detection element 125 is as described with reference to FIG. 2 and FIG.
- the same structure as that of Embodiment Mode 1 can be manufactured in the same manner.
- the stopper 230 may be formed by welding and joining to the first fixed portion 35 or by processing members made of the same material.
- FIG. 13 is a partially enlarged view showing a state in which the strain sensor 221 is deformed by applying a load to the strain generating body 32 in the strain sensor 221.
- a load is applied to the strain sensor 221 connected to the body to be detected in the direction of pushing the strain generating body 32 in the direction of the shaft 34 via the first fixing portion 35 or the second fixing portion 37.
- the strain body 32 is deformed by this load.
- a shear load f is applied to the first fixed portion 35. Due to the shear load f, moment force acts on the outer surface of the strain body 32, and tensile stress is applied between the first connection portion 33 and the second connection portion 36 of the strain body 32.
- the strain body 32 is deformed so as to be displaced outward at a portion between the first connecting portion 33 and the second connecting portion 36 and so that the extending portion 42 is displaced inward. Similar to the first embodiment, the extending portion 42 extends in parallel with the direction of the shaft 34 from the strain body 32 toward the side where the second fixing portion 37 is provided.
- a stopper 230 is provided on the first fixing portion 35. Therefore, even if an excessive load F is applied to the strain sensor 221 and the strain generating body 32 is greatly deformed, the stopper 230 comes into contact with the second fixing portion 37 and prevents the strain generating body 32 from being deformed. As a result, the strain body 32 cannot be deformed to the extent that its durability is exceeded. Thus, since the magnitude
- the stopper 230 is separated from the second fixing portion 37. Therefore, during normal use, the stopper 230 does not hinder the deformation of the strain body 32, and the strain body 32 can be sufficiently deformed. For this reason, the durability of the strain sensor 221 can be improved without reducing the detection accuracy of the strain sensor 221.
- FIG. 14 is a configuration diagram of the load detection device 139A including the strain sensor 221, and FIG. 15 is a cross-sectional view taken along line 15-15 of the load detection device 139A shown in FIG. That is, the load detection device 139A uses the strain sensor 221 instead of the strain sensor 120 in the load detection device 139 of the second embodiment.
- the strain sensor 221 attached to the load detection device 139A transmits the pedaling force Ft applied by the user to the pedal arm 140 to the operating rod 143. Even when the user applies a pedaling force Ft to the pedal arm 140 with a strength exceeding the assumption, the deformation amount of the strain generating body 32 is limited by the stopper 230. Therefore, the breakage of the first connection portion 33 at the boundary between the strain body 32 and the first fixing portion 35 can be prevented. As a result, when the user is driving the vehicle, the first connecting portion 33 is prevented from being broken and the strain sensor 221 is prevented from being broken, and the user cannot be braked. Can be improved.
- the shape of the stopper 230 may be, for example, a conical shape, a hemispherical shape, or the like other than a cylindrical shape.
- the size of the stopper 230 and the width in the radial direction can also be appropriately selected according to the length of the gap 43 in the direction of the axis 34, the intended use, the cross-sectional area of the first connection portion 33, and the like. In the present embodiment, only one stopper 230 is provided, but a plurality of stoppers 230 may be provided.
- the plurality of stoppers 230 are used in the use environment. Can be arranged accordingly. Therefore, durability can be further improved.
- FIG. 16 is a side sectional view of the strain sensor 251.
- a stopper 252 is provided on the surface 229 of the first fixing portion 35 facing the gap 43 instead of the stopper 230. Further, the stopper 252 has a screw portion 252A connected to a screw hole 253 provided in the second fixing portion 37.
- the deformation of the strain generating body 32 is more limited than in the strain sensor 221. For this reason, the durability of the strain body 32 is further improved.
- the sum of the cross-sectional area (minimum cross-sectional area) of the narrowest portion S of the connection portion between the strain body 32 and the first fixing portion 35 and the effective cross-sectional area of the stopper 252 is the first relationship of the first fixing portion 35. It is preferable that it is larger than the effective area at the joint portion 127.
- the effective cross-sectional area means a cross-sectional area obtained from the effective diameter of the screw in the portion having the screw structure.
- the strain generating body 32 When a load is applied in the direction of the shaft 34, a force is similarly applied to the first connecting portion 33 and the stopper 252. At this time, if the sum of the cross-sectional area of the narrowest portion S and the effective cross-sectional area of the stopper 252 is larger than the effective cross-sectional area of the first fixing portion 35, the strain generating body 32 will apply when an excessive load is applied. First, the first fixing portion 35 is broken. That is, the durability of the strain body 32 with respect to the load can be made higher than that of the first fixing portion 35. Therefore, the durability of the strain sensor 221 can be further improved.
- the stopper 252 is screwed to the second fixing portion 37, but the stopper 252 can move by a space between the screw hole of the second fixing portion 37 and the stopper 252. Therefore, distortion can be detected without hindering deformation of the strain generating body 32.
- FIG. 17 is a side sectional view of the strain sensor 261.
- a stopper 262 is provided on the surface 229 of the first fixing portion 35 facing the gap 43 instead of the stopper 230. Further, the stopper 262 is inserted into a hole 263 provided in the second fixing portion 37. The stopper 262 is provided with an extending portion 264 that extends in a direction different from the direction in which the stopper 262 extends (the direction of the shaft 34) from the tip 262A. The tip 262A is the end of the stopper 262 that is farthest from the first engagement portion 127 in the direction in which the shaft 34 extends.
- the stopper 262 When an excessive load is applied to the strain sensor 261, the stopper 262 contacts the bottom surface of the second fixing portion 37. Therefore, the stopper 262 can limit the magnitude of deformation of the strain body 32, similarly to the stopper 230. Therefore, the durability of the strain sensor 261 is improved. Further, since the tip 262A of the stopper 262 and the bottom surface of the second fixing portion 37 are separated from each other, the strain generating body 32 can be sufficiently deformed when a load is applied to the strain sensor 261. Therefore, the durability of the strain sensor 261 is improved without degrading the detection accuracy.
- the stopper 262 since the stopper 262 is provided with the extending portion 264, it extends even if the first connecting portion 33 is broken and the strain body 32 and the first fixing portion 35 are separated for some reason. The part 264 is in contact with the second fixing part 37. Therefore, it can prevent that the 1st fixing
- the function as a load transmission member can be achieved. Therefore, if the strain sensor 261 is applied to the load detection device 139A shown in FIG. 14, even if the strain sensor 261 breaks and loses its function as a sensor, the pedal force is transmitted from the clevis 142 to the operating rod 143. be able to. Therefore, the reliability of the load detection device 139A is improved.
- stopper 262 and the extending part 264 may be formed by welding and joining and integrating them, or by processing members made of the same material.
- the strain sensor of the present invention can reduce the influence of the axial force generated when the strain sensor is attached to the detected object and can improve the detection accuracy of the strain sensor. This is useful for detecting the cable tension of the vehicle parking brake, detecting the seat load of the vehicle seat, and the like.
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Abstract
Description
図1は本発明の実施の形態1における歪センサ31の側断面図である。図2は歪センサ31の起歪体32の外周面の展開図である。
図6は本発明の実施の形態2における歪センサ120の側断面図である。歪センサ120は、起歪体32と、第1固定部35と、第2固定部37と、歪検出素子125とを有する。第1固定部35は、第1接続部33で起歪体32の内側に接続され、起歪体32の第一端の開口部から軸34の方向に延出している。第2固定部37は、第2接続部36で起歪体32の内側に接続され、起歪体32の第二端の開口部から第1固定部35と反対の方向に、起歪体32との間に空隙43を挟んで延出している。すなわち、起歪体32の第一端の開口部を埋めるように第1固定部35が接合され、第二端の開口部を埋めるように第2固定部37が接合され、第1固定部35と第2固定部37との間に空隙43が設けられている。また、第1固定部35は被検出体(図示せず)に固定される第1係合部127を有し、第2固定部37は被検出体に固定される第2係合部126を有する。歪検出素子125は、起歪体32の外周面に設けられている。以上の構成は実施の形態1における歪センサ31と同様である。歪センサ120が歪センサ31と異なる点は、第1厚肉部39、第2厚肉部41に代えて、第2固定部37において、第2係合部126と、起歪体32と接続される第2接続部36との間に受け部128が設けられていることである。
図12は本発明の実施の形態3における歪センサ221の側断面図である。歪センサ221は、起歪体32と、第1固定部35と、第2固定部37と、第1歪抵抗パターン48~第4歪抵抗パターン51とを有する。第1歪抵抗パターン48~第4歪抵抗パターン51は実施の形態1、2と同様に、図2に示す歪検出素子125を構成している。第1固定部35は、第1接続部33で起歪体32の内側に接続され、起歪体32の第一端の開口部から軸34の方向に延出している。第2固定部37は、第2接続部36で起歪体32の内側に接続され、起歪体32の第二端の開口部から第1固定部35と反対の方向に、起歪体32との間に空隙43を挟んで延出している。また、第1固定部35は被検出体(図示せず)に固定される第1係合部127を有し、第2固定部37は被検出体に固定される第2係合部126を有する。歪検出素子125は、起歪体32の外周面に設けられている。以上の構成は実施の形態1における歪センサ31と同様である。歪センサ221が歪センサ31と異なる点は、空隙43に面した第1固定部35の面229に円柱形状のストッパー230が設けられていることである。
32 起歪体
33 第1接続部
34 軸
35 第1固定部
36 第2接続部
37 第2固定部
38 第1面
39 第1厚肉部
40 第2面
41 第2厚肉部
42 延出部
43 空隙
44 第1出力電極
45 第2出力電極
46 電源電極
47 グランド電極
48 第1歪抵抗パターン(パターン)
49 第2歪抵抗パターン(パターン)
50 第3歪抵抗パターン(パターン)
51 第4歪抵抗パターン(パターン)
125 歪検出素子
126 第2係合部
127 第1係合部
128 受け部
129 径方向
139,139A 荷重検出装置
140 ペダルアーム
141 クレビスピン
142 クレビス
143 オペロッド
144,145 取付孔
146 ナット
229 面
230,252,262 ストッパー
252A ネジ部
253 ネジ穴
262A 先端
263 穴部
264 延在部
Claims (17)
- 軸方向に沿って延びる筒状の起歪体と、
前記起歪体と第1接続部で接続され、前記起歪体の第一端の開口部から前記軸方向に延出し、被検出体に固定される第1係合部を有する第1固定部と、
前記起歪体と第2接続部で接続され、前記起歪体の第二端の開口部から前記第1固定部と反対の方向に、前記起歪体との間に空隙を挟んで延出し、前記被検出体に固定される第2係合部を有する第2固定部と、
前記起歪体の外周面に設けられた歪検出素子と、を備え、
前記歪検出素子は、前記軸方向において、前記歪検出素子の中心が、前記空隙の中心に対して前記第2固定部がある方にあるように配置された、
歪センサ。 - 前記軸方向において、前記歪検出素子の中心が、前記第2接続部における前記空隙寄りの位置に設けられている、
請求項1の歪センサ。 - 第1出力電極と、第2出力電極と、電源電極と、グランド電極とを含む回路パターンをさらに備え、
前記歪検出素子は、
前記電源電極と前記第1出力電極とを接続した第1歪検出素子と、
前記グランド電極と前記第1出力電極とを接続した第2歪検出素子と、
前記電源電極と前記第2出力電極とを接続した第3歪検出素子と、
前記グランド電極と前記第2出力電極とを接続した第4歪検出素子とで構成されている、
請求項1に記載の歪センサ。 - 前記第1歪検出素子と前記第3歪検出素子とは、前記軸方向において前記第2接続部における前記空隙寄りに設けられ、
前記第2歪検出素子と前記第4歪検出素子とは、前記軸方向において前記第2接続部における前記空隙と反対側に設けられている、
請求項3に記載の歪センサ。 - 前記起歪体は、前記第2接続部から前記第2固定部が延出する方向と同じ方向に延出した延出部を有し、
前記第1歪検出素子と前記第3歪検出素子とは、前記軸方向において前記第2接続部における前記空隙寄りに設けられ、
前記第2歪検出素子と前記第4歪検出素子とは、前記軸方向において前記第2接続部における前記延出部寄りまたは前記延出部上に設けられている、
請求項3に記載の歪センサ。 - 前記第1固定部は、前記第1接続部と前記第1係合部との間に、前記軸方向と直交する方向に突出する第1厚肉部を有し、
前記第2固定部は、前記第2接続部と前記第2係合部との間に、前記軸方向と直交する方向に突出する第2厚肉部を有する、
請求項1に記載の歪センサ。 - 前記第2固定部は、前記第1接続部と前記第1係合部との間に、前記被検出体から加えられる力を受ける受け部を有する、
請求項1に記載の歪センサ。 - 前記受け部の前記起歪体の径方向の長さは、前記空隙の前記径方向の長さよりも短い、
請求項7に記載の歪センサ。 - 前記受け部は、前記第2固定部に複数設けられている、
請求項7に記載の歪センサ。 - 前記受け部は、前記第2固定部の外周を囲むように設けられている、
請求項7に記載の歪センサ。 - 前記第1固定部は、前記空隙と面した面にストッパーを有している、請求項1に記載の歪センサ。
- 前記第2固定部はネジ穴を有し、
前記ストッパーは前記ネジ穴に接続されたネジ部を有する、
請求項11に記載の歪センサ。 - 前記起歪体と前記第1固定部との接続部分の最小断面積と前記ストッパーの有効断面積との和は、前記第1固定部の有効断面積よりも大きい、
請求項12に記載の歪センサ。 - 前記ストッパーは、前記軸方向と異なる方向に延在した延在部を有する、
請求項11に記載の歪センサ。 - 前記ストッパーは、前記第1固定部に複数設けられている、
請求項11に記載の歪センサ。 - 入力荷重が加えられる入力部材と、
前記入力部材と接続された接続部材と、
前記接続部材と前記第1接続部で接続された請求項1に記載の歪センサと、
前記請求項1に記載の歪センサの前記第2接続部と接続され、前記入力荷重を伝達する伝達部材と、を備えた、
荷重検出装置。 - 前記接続部材と前記歪センサの前記第1接続部とを固定するナットをさらに備えた、
請求項16に記載の荷重検出装置。
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EP15777395.3A EP3130899A1 (en) | 2014-04-08 | 2015-03-30 | Strain sensor and load detector using same |
JP2016512590A JPWO2015155956A1 (ja) | 2014-04-08 | 2015-03-30 | 歪センサおよびそれを用いた荷重検出装置 |
US15/126,275 US20170082508A1 (en) | 2014-04-08 | 2015-03-30 | Strain sensor and load detector using same |
CN201580017792.6A CN106461477A (zh) | 2014-04-08 | 2015-03-30 | 应变传感器以及使用了该应变传感器的载荷检测装置 |
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WO2021070665A1 (ja) * | 2019-10-09 | 2021-04-15 | 日本電産コパル電子株式会社 | 歪センサの固定装置とそれを用いたトルクセンサ |
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JP5723402B2 (ja) * | 2013-03-01 | 2015-05-27 | 富士重工業株式会社 | 車輪作用力検出装置 |
JP5764610B2 (ja) * | 2013-05-08 | 2015-08-19 | 富士重工業株式会社 | ブッシュ分力検出装置 |
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2015
- 2015-03-30 EP EP15777395.3A patent/EP3130899A1/en not_active Withdrawn
- 2015-03-30 US US15/126,275 patent/US20170082508A1/en not_active Abandoned
- 2015-03-30 JP JP2016512590A patent/JPWO2015155956A1/ja active Pending
- 2015-03-30 WO PCT/JP2015/001820 patent/WO2015155956A1/ja active Application Filing
- 2015-03-30 CN CN201580017792.6A patent/CN106461477A/zh active Pending
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JPS5784325A (en) * | 1980-11-15 | 1982-05-26 | Kubota Ltd | Device for protecting load cell in measuring instrument |
DE3405127A1 (de) * | 1984-02-14 | 1985-09-05 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Kraftaufnehmer |
JPH01219645A (ja) * | 1988-02-29 | 1989-09-01 | Tokin Corp | 重量検出装置 |
JP2007263953A (ja) * | 2006-02-28 | 2007-10-11 | Alps Electric Co Ltd | 荷重センサ |
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JP2014041078A (ja) * | 2012-08-23 | 2014-03-06 | Panasonic Corp | 歪検出装置の製造方法 |
Also Published As
Publication number | Publication date |
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JPWO2015155956A1 (ja) | 2017-04-13 |
US20170082508A1 (en) | 2017-03-23 |
CN106461477A (zh) | 2017-02-22 |
EP3130899A1 (en) | 2017-02-15 |
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