WO2014167823A1 - Torque sensor - Google Patents
Torque sensor Download PDFInfo
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- WO2014167823A1 WO2014167823A1 PCT/JP2014/001978 JP2014001978W WO2014167823A1 WO 2014167823 A1 WO2014167823 A1 WO 2014167823A1 JP 2014001978 W JP2014001978 W JP 2014001978W WO 2014167823 A1 WO2014167823 A1 WO 2014167823A1
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- WIPO (PCT)
- Prior art keywords
- stage
- hole
- shaft
- torque sensor
- fitting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/02—Rotary-transmission dynamometers
- G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
- G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
- G01L3/108—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving resistance strain gauges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/02—Rotary-transmission dynamometers
- G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
- G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
- G01L3/106—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving electrostatic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0004—Force transducers adapted for mounting in a bore of the force receiving structure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0061—Force sensors associated with industrial machines or actuators
- G01L5/0076—Force sensors associated with manufacturing machines
- G01L5/008—Force sensors integrated in an article or a dummy workpiece
Definitions
- the present disclosure relates to a torque sensor that measures strain generated in a shaft.
- Patent Document 1 discloses a torque sensor that measures strain generated in a shaft. Specifically, a torque sensor including an axis provided with a plane portion and a strain detection board provided with a sensing portion that detects strain is described.
- screw holes are provided in the flat portion of the shaft, and a plurality of through holes into which screws are inserted are provided in the strain detection substrate. Then, the strain detection board is fixed to the shaft by inserting the screw into the through hole of the strain detection board and tightening the screw into the screw hole of the shaft.
- the strain detection board is screwed to the shaft in the conventional technique, the stress due to the strain generated on the shaft is transmitted through the contact portion between the shaft and the screw and the contact portion between the screw and the strain detection substrate. Become. Specifically, the stress is transmitted in the direction in which the strain detection board is attached to the shaft. That is, the stress is transmitted in a direction orthogonal to the center line of the shaft. As described above, since the stress is transmitted from the shaft to the strain detection substrate via the screw, the stress is not uniformly transmitted to the sensing unit, which may affect the strain detection accuracy.
- This disclosure is intended to provide a torque sensor that can uniformly transmit stress due to strain generated in a shaft to a sensor chip.
- a torque configured to measure strain generated in a shaft having a hole formed by a bottom surface and a wall surface in contact with the bottom surface and the surface due to a part of the surface being recessed. It is a sensor.
- it has an outer surface and a side surface inclined with respect to the outer surface, and a stage disposed in the hole of the shaft.
- a sensor chip is provided on the outer surface of the stage and detects the strain of the shaft through the stage.
- the shaft hole portion has a first engagement portion for fixing the stage to the wall surface.
- the stage has a second engaging portion on the side surface thereof, wherein the side surface is brought into direct contact with the wall surface of the hole portion, and the stage is fixed to the hole portion by engaging with the first engaging portion.
- the stage since the stage is fixed to the hole of the shaft by the first engaging portion of the shaft and the second engaging portion of the stage, the stress caused by the strain generated in the shaft is directly applied from the wall surface of the hole to the side surface of the stage. It is transmitted. Along with this, the stage deforms itself by the stress. Therefore, the stress due to the strain generated in the shaft can be uniformly transmitted to the sensor chip.
- FIG. 1 is a schematic diagram of a torque sensor according to a first embodiment of the present disclosure.
- FIG. 2 is an exploded view of the torque sensor of FIG.
- FIG. 3 is an exploded view of the torque sensor according to the second embodiment of the present disclosure.
- FIG. 4 is an exploded view of the torque sensor according to the third embodiment of the present disclosure.
- FIG. 5 is a schematic diagram of a stage according to another embodiment
- FIG. 6 is a schematic diagram of a stage according to another embodiment.
- the torque sensor according to the present embodiment is used, for example, to detect the torque of a shaft of an automobile engine or a compressor shaft for an air conditioner.
- the torque sensor 10 includes a shaft 20, a stage 30, and a sensor chip 40.
- the shaft 20 is a rod-shaped so-called shaft and is a strain measurement target. Further, the shaft 20 has a hole 22 having a recessed surface 21.
- the hole 22 includes a bottom surface 23 and a wall surface 24 in contact with the bottom surface 23 and the surface 21 because a part of the surface 21 of the shaft 20 is recessed.
- the planar shape along the center line of the axis 20 of the bottom surface 23 is a circle.
- the wall surface 24 of the hole 22 is threaded. That is, a female screw 25 for fixing the stage 30 is formed on the wall surface 24 of the hole 22.
- a hard material such as carbon steel is employed.
- the stage 30 is a plate-like component having an outer surface 31 and a side surface 32 inclined with respect to the outer surface 31.
- the planar shape of the outer surface 31 of the stage 30 is a circle. That is, the stage 30 has a disk shape. Therefore, in this embodiment, the outer surface 31 of the stage 30 is in contact with the side surface 32, and the outer surface 31 and the side surface 32 are in a vertical relationship.
- the side surface 32 of the stage 30 is threaded. That is, a male screw 33 is formed on the side surface 32 of the stage 30.
- the male screw 33 is an engaging portion that fixes the stage 30 to the hole portion 22 by bringing the side surface 32 of the stage 30 into direct contact with the wall surface 24 of the hole portion 22 and engaging with the female screw 25. Therefore, as shown in FIG. 1, the stage 30 is fixed to the hole 22 of the shaft 20 by screwing.
- the diameter of the outer surface 31 of the stage 30 is the same as the diameter of the hole 22 of the shaft 20, that is, the diameter of the bottom surface 23. Further, the stage 30 is screwed into the hole 22 so that the outer surface 31 of the stage 30 is located on the same plane as the surface 21 of the shaft 20.
- the outer surface 31 of the stage 30 is provided with a structure necessary for screwing the stage 30 to the shaft 20.
- an adhesive (not shown) is provided on the bottom surface 23 of the hole 22 so that the stage 30 is not easily detached from the hole 22 of the shaft 20. Thereby, since the axis
- the stage 30 as described above is made of a material having a Young's modulus lower than that of the shaft 20.
- a metal material such as Al or a resin.
- the sensor chip 40 is a strain measurement sensor configured to detect the strain of the shaft 20 via the stage 30.
- the sensor chip 40 has a sensing unit that detects strain.
- a strain gauge method for detecting strain by changing a resistance value of the gauge resistance, or a surface acoustic wave (SAW) method for detecting strain using a surface acoustic wave is adopted.
- the sensor chip 40 is disposed on the outer surface 31 of the stage 30 via an adhesive.
- the sensor chip 40 is electrically connected to an external device via wiring such as a lead.
- the extending direction of each gauge resistance in the sensor chip 40 is 45 with respect to the longitudinal direction of the shaft 20. Need to tilt to °.
- the direction in which the gauge resistance extends when the stage 30 is fastened to the hole 22 of the shaft 20 is the longitudinal direction of the shaft 20. It should be tilted at 45 ° with respect to it.
- the mounting angle of the stage 30 with respect to the shaft 20 can be arbitrarily set by adjusting the positions of threading of the male screw 33 and the female screw 25.
- strain detection method of the torque sensor 10 When strain is generated in the shaft 20, stress due to the strain is transmitted through the shaft 20. At the boundary between the shaft 20 and the stage 30, stress due to strain is transmitted from the wall surface 24 of the hole portion 22 of the shaft 20 to the side surface 32 of the stage 30. That is, the strain is transmitted from the shaft 20 to the stage 30 through a contact portion between the female screw 25 of the hole 22 of the shaft 20 and the male screw 33 of the stage 30. Then, the stress transmitted to the stage 30 is detected by the sensing unit of the sensor chip 40.
- the torque sensor 10 is screwed to the shaft 20 while the stage 30 has a screw shape.
- the stress due to the strain generated in the shaft 20 can be directly transmitted from the wall surface 24 of the hole 22 to the side surface 32 of the stage 30.
- stress due to strain can be transmitted from the shaft 20 to the stage 30 in the surface direction of the outer surface 31 of the stage 30.
- the stage 30 can deform itself by the stress. Therefore, the stress due to the strain generated in the shaft 20 can be uniformly transmitted to the sensor chip 40.
- the entire side surface 32 of the stage 30 has a screw shape, so that the entire side surface 32 of the stage 30 contacts the wall surface 24 of the hole 22.
- the transmission of stress from the shaft 20 to the stage 30 can be transmitted more uniformly.
- the stage 30 can be displaced more uniformly due to the strain.
- the planar shape of the outer surface 31 of the stage 30 and the hole 22 of the shaft 20 is circular. Therefore, the distribution of the stress transmitted from the shaft 20 to the stage 30 can be made most uniform when the planar shape is a polygonal shape. Furthermore, since the outer surface 31 of the stage 30 is located on the same plane as the surface 21 of the shaft 20, there is also an advantage that the stress distribution is the best.
- the stage 30 does not need to weld the stage 30 to the shaft 20 because the stage 30 itself has a screw shape. It is also easy to form the stage 30 in a screw shape. Further, the stage 30 can be fixed to the shaft 20 more easily than when the stage 30 is fixed to the shaft 20 by welding or an adhesive. Of course, the sensor chip 40 can be replaced by removing the stage 30 from the shaft 20.
- the female screw 25 corresponds to the first engaging portion
- the male screw 33 corresponds to the second engaging portion
- the hole portion 22 of the shaft 20 has a plurality of insertion holes 26 on the wall surface 24, in which a part of the wall surface 24 is recessed and extends from the surface 21 of the shaft 20 toward the bottom surface 23. ing.
- the insertion hole 26 has a certain length from the surface 21 of the shaft 20 to the bottom surface 23 side, and has a certain length in the circumferential direction of the bottom surface 23 from the end of the insertion hole 26 on the bottom surface 23 side. It has a groove. In other words, an L-shaped groove is formed on the wall surface 24 of the hole 22.
- the stage 30 has a plurality of protrusions 34 on the side surface 32 with a part of the side surface 32 protruding.
- the protrusion 34 has a cylindrical shape.
- the circumferential width of the outer surface 31 of the stage 30 in the protrusion 34 is equal to or less than the circumferential width of the bottom surface 23 of the hole 22 of the shaft 20 in the insertion hole 26.
- the height of the protrusion 34 is equal to or greater than the depth of the insertion hole 26.
- the diameter of the outer surface 31 of the stage 30 is the same as the diameter of the bottom surface 23 of the hole 22 of the shaft 20.
- each projection 34 is formed at a position corresponding to each insertion hole 26.
- the projections 34 of the stage 30 are inserted into the corresponding insertion holes 26, and the stage 30 is fixed to the holes 22 by moving through the insertion holes 26 to the end portions along the insertion holes 26. In this way, the stage 30 is fixed to the shaft 20 as shown in FIG.
- the insertion hole 26 corresponds to the first engagement portion
- the protrusion 34 corresponds to the second engagement portion
- the hole portion 22 of the shaft 20 has a plurality of fitting holes 27 in which a part of the wall surface 24 is recessed in the wall surface 24.
- the stage 30 has a plurality of fitting portions 35 in which a part of the side surface 32 protrudes on the side surface 32.
- the fitting portion 35 is a triangular prism, and the fitting hole 27 is a triangular prism-shaped groove. Further, the planar shape of the fitting portion 35 and the planar shape of the fitting hole 27 are the same, and the planar size of the fitting portion 35 is equal to or smaller than the planar size of the fitting hole 27. Further, the height of the fitting portion 35 is equal to or greater than the depth of the fitting hole 27.
- Four fitting holes 27 and four fitting portions 35 are provided in each of the hole portion 22 and the stage 30. Each fitting portion 35 is formed at a position corresponding to each fitting hole 27.
- the fitting part 35 When the stage 30 is inserted into the hole 22 by press fitting or the like, the fitting part 35 is fitted into the fitting hole 27 and cannot move. That is, the fitting part 35 is strongly joined to the fitting hole 27. In other words, the fitting portion 35 is put into a fitted and killed state by the fitting hole 27. Thereby, the stage 30 is fixed to the hole 22.
- the side surface 32 of the stage 30 and the wall surface 24 of the hole portion 22 of the shaft 20 can be brought into contact with each other so that stress due to strain can be uniformly transmitted from the shaft 20 to the stage 30.
- the fitting hole 27 corresponds to the first engaging portion
- the fitting portion 35 corresponds to the second engaging portion
- the configuration of the torque sensor 10 shown in each of the above embodiments is an example, and is not limited to the configuration shown above, and may be another configuration that can realize the present disclosure.
- the torque sensor 10 is used for a vehicle, this is an example of a usage form of the torque sensor 10, and of course, it can be used for other than the vehicle.
- the stage 30 itself has a screw shape.
- a hexagonal hole is provided in the outer surface 31 of the stage 30, and the sensor chip 40 is placed in the hole. It may be arranged. Thereby, the stage 30 can be easily attached to the shaft 20.
- the stage 30 itself may be a bolt.
- a hole may be provided in the bolt portion, and the bottom of the hole may be used as the outer surface 31 of the stage 30. Thereby, the sensor chip 40 can be protected.
- the stage 30 may have a truncated cone shape or a cone shape instead of the columnar shape. In this case, the outer surface 31 and the side surface 32 of the stage 30 are in a relationship inclined at a predetermined angle. This is possible even if the stage 30 is provided with the protrusion 34 and the fitting portion 35.
- the cylindrical protrusion 34 is adopted, but this is an example of the protrusion 34. Therefore, the protrusion 34 may be a polygonal column. Further, the shape of the insertion hole 26 is not limited to the L shape, and may be other shapes. Similarly, for the fitting portion 35 shown in the third embodiment, the fitting portion 35 may be a polygonal column or a cylinder other than the triangular column. Furthermore, the numbers and positions of the protrusions 34 and the fitting portions 35 are not limited as in the above embodiment, and may be set as appropriate.
- the outer surface 31 of the stage 30 and the surface 21 of the shaft 20 are located on the same plane, but this is an example of fixing the stage 30 to the shaft 20. Therefore, when the stage 30 is attached to the shaft 20, a part of the stage 30 may not coincide with the surface 21 of the shaft 20. For example, the outer surface 31 of the stage 30 may protrude from the surface 21 of the shaft 20.
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- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
In a side surface (32) of a stage (30) there is formed a male thread (33) for bringing a hole part (22) in the side face (32) into direct contact with a wall surface (24), as well as for fastening the stage (30) within the hole (22). A female thread (25) is formed on the wall surface (24) of the hole part (22) of a shaft (20). The stage (30) is then screwed into the shaft (20). Stress produced by strain occurring in the shaft (20) is thereby transmitted directly to the entire side surface (32) of the stage (30) from the wall surface (24) of the hole part (22), and the stage (30) itself is deformed by this stress. Consequently, strain occurring in the shaft (20) can be transmitted uniformly to a sensor chip (40).
Description
本開示は、2013年4月10日に出願された日本出願番号2013-81945号に基づくもので、ここにその記載内容を援用する。
This disclosure is based on Japanese Patent Application No. 2013-81945 filed on April 10, 2013, the contents of which are incorporated herein by reference.
本開示は、軸に発生する歪を測定するトルクセンサに関するものである。
The present disclosure relates to a torque sensor that measures strain generated in a shaft.
従来、軸に発生する歪を測定するトルクセンサが、例えば特許文献1で記載されている。具体的には、平面部が設けられた軸と、歪を検出するセンシング部が設けられた歪検出基板と、を備えたトルクセンサが記載されている。
Conventionally, for example, Patent Document 1 discloses a torque sensor that measures strain generated in a shaft. Specifically, a torque sensor including an axis provided with a plane portion and a strain detection board provided with a sensing portion that detects strain is described.
また、軸の平面部にはネジ穴が設けられていると共に、歪検出基板にはネジが挿入される複数の貫通孔が設けられている。そして、ネジが歪検出基板の貫通孔に差し込まれて軸のネジ穴に締め付けられることにより、歪検出基板が軸に固定される。
Also, screw holes are provided in the flat portion of the shaft, and a plurality of through holes into which screws are inserted are provided in the strain detection substrate. Then, the strain detection board is fixed to the shaft by inserting the screw into the through hole of the strain detection board and tightening the screw into the screw hole of the shaft.
しかしながら、上記従来の技術では、歪検出基板が軸にネジ止めされているので、軸で発生した歪による応力が軸とネジとの接触部及びネジと歪検出基板との接触部で伝わることになる。具体的に、応力は歪検出基板の軸への取付方向に伝わる。すなわち、応力は軸の中心線に直交する方向に伝わる。このように、ネジを介して軸から歪検出基板に応力を伝達させているので、センシング部への応力の伝達が不均一になり、歪の検出精度等に影響を及ぼすというおそれがある。
However, since the strain detection board is screwed to the shaft in the conventional technique, the stress due to the strain generated on the shaft is transmitted through the contact portion between the shaft and the screw and the contact portion between the screw and the strain detection substrate. Become. Specifically, the stress is transmitted in the direction in which the strain detection board is attached to the shaft. That is, the stress is transmitted in a direction orthogonal to the center line of the shaft. As described above, since the stress is transmitted from the shaft to the strain detection substrate via the screw, the stress is not uniformly transmitted to the sensing unit, which may affect the strain detection accuracy.
本開示は、軸で発生した歪による応力をセンサチップに均一に伝えることができるトルクセンサを提供することを目的とする。
This disclosure is intended to provide a torque sensor that can uniformly transmit stress due to strain generated in a shaft to a sensor chip.
本開示の第一の態様において、表面の一部が凹んだことにより底面とこの底面及び表面に接する壁面とで構成された穴部を有する軸に発生する歪を測定するように構成されたトルクセンサである。
In the first aspect of the present disclosure, a torque configured to measure strain generated in a shaft having a hole formed by a bottom surface and a wall surface in contact with the bottom surface and the surface due to a part of the surface being recessed. It is a sensor.
すなわち、外表面と外表面に対して傾けられた側面とを有すると共に、軸の穴部に配置されるステージを備えている。また、ステージの外表面に設置されていると共に、ステージを介して前記軸の歪を検出するセンサチップを備えている。
That is, it has an outer surface and a side surface inclined with respect to the outer surface, and a stage disposed in the hole of the shaft. A sensor chip is provided on the outer surface of the stage and detects the strain of the shaft through the stage.
そして、軸の穴部は、壁面に、ステージを固定する第1係合部を有している。さらに、ステージは、側面に、当該側面を穴部の壁面に直接接触させると共に、第1係合部に係合することで当該ステージを穴部に固定する第2係合部を有している。
The shaft hole portion has a first engagement portion for fixing the stage to the wall surface. Further, the stage has a second engaging portion on the side surface thereof, wherein the side surface is brought into direct contact with the wall surface of the hole portion, and the stage is fixed to the hole portion by engaging with the first engaging portion. .
これによると、軸の第1係合部とステージの第2係合部によってステージが軸の穴部に固定されるので、軸で発生した歪による応力が穴部の壁面からステージの側面に直接伝わる。これに伴い、ステージが当該応力によって自ら変形する。したがって、軸で発生した歪による応力を、センサチップに均一に伝えることができる。
According to this, since the stage is fixed to the hole of the shaft by the first engaging portion of the shaft and the second engaging portion of the stage, the stress caused by the strain generated in the shaft is directly applied from the wall surface of the hole to the side surface of the stage. It is transmitted. Along with this, the stage deforms itself by the stress. Therefore, the stress due to the strain generated in the shaft can be uniformly transmitted to the sensor chip.
本開示についての上記目的およびその他の目的、特徴や利点は、添付の図面を参照しながら下記の詳細な記述により、より明確になる。その図面は、
図1は、本開示の第1実施例に係るトルクセンサの模式図であり、
図2は、図1のトルクセンサの分解図であり、
図3は、本開示の第2実施例に係るトルクセンサの分解図であり、
図4は、本開示の第3実施例に係るトルクセンサの分解図であり、
図5は、他の実施例に係るステージの模式図であり、
図6は、他の実施例に係るステージの模式図である。
The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings. The drawing
FIG. 1 is a schematic diagram of a torque sensor according to a first embodiment of the present disclosure. FIG. 2 is an exploded view of the torque sensor of FIG. FIG. 3 is an exploded view of the torque sensor according to the second embodiment of the present disclosure. FIG. 4 is an exploded view of the torque sensor according to the third embodiment of the present disclosure. FIG. 5 is a schematic diagram of a stage according to another embodiment, FIG. 6 is a schematic diagram of a stage according to another embodiment.
以下、本開示の実施例について図に基づいて説明する。なお、以下の各実施例相互において、互いに同一もしくは均等である部分には、図中、同一符号を付してある。
Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.
(第1実施例)
以下、本開示の第1実施例について図を参照して説明する。本実施例に係るトルクセンサは、例えば自動車のエンジンのシャフトやエアコン用のコンプレッサの軸のトルクを検出するものとして利用される。 (First embodiment)
Hereinafter, a first embodiment of the present disclosure will be described with reference to the drawings. The torque sensor according to the present embodiment is used, for example, to detect the torque of a shaft of an automobile engine or a compressor shaft for an air conditioner.
以下、本開示の第1実施例について図を参照して説明する。本実施例に係るトルクセンサは、例えば自動車のエンジンのシャフトやエアコン用のコンプレッサの軸のトルクを検出するものとして利用される。 (First embodiment)
Hereinafter, a first embodiment of the present disclosure will be described with reference to the drawings. The torque sensor according to the present embodiment is used, for example, to detect the torque of a shaft of an automobile engine or a compressor shaft for an air conditioner.
図1及び図2に示されるように、トルクセンサ10は、軸20と、ステージ30と、センサチップ40と、を備えて構成されている。
As shown in FIGS. 1 and 2, the torque sensor 10 includes a shaft 20, a stage 30, and a sensor chip 40.
軸20は、棒状のいわゆるシャフトであり、歪の測定対象である。また、軸20は表面21が凹んだ穴部22を有している。穴部22は、軸20の表面21の一部が凹んだことにより底面23とこの底面23及び表面21に接する壁面24とで構成されている。底面23の軸20の中心線に沿った平面形状が円形である。そして、図2に示されるように、穴部22の壁面24はネジ切り加工されている。すなわち、穴部22の壁面24にはステージ30を固定する雌ネジ25が形成されている。軸20の材質として、例えば炭素鋼等の硬い材料が採用される。
The shaft 20 is a rod-shaped so-called shaft and is a strain measurement target. Further, the shaft 20 has a hole 22 having a recessed surface 21. The hole 22 includes a bottom surface 23 and a wall surface 24 in contact with the bottom surface 23 and the surface 21 because a part of the surface 21 of the shaft 20 is recessed. The planar shape along the center line of the axis 20 of the bottom surface 23 is a circle. And as FIG. 2 shows, the wall surface 24 of the hole 22 is threaded. That is, a female screw 25 for fixing the stage 30 is formed on the wall surface 24 of the hole 22. As the material of the shaft 20, for example, a hard material such as carbon steel is employed.
ステージ30は、外表面31とこの外表面31に対して傾けられた側面32とを有する板状の部品である。本実施例では、ステージ30の外表面31の平面形状は円形である。すなわち、ステージ30は円板状をなしている。したがって、本実施例では、ステージ30の外表面31は側面32に接していると共に、外表面31と側面32とが垂直の関係になっている。
The stage 30 is a plate-like component having an outer surface 31 and a side surface 32 inclined with respect to the outer surface 31. In the present embodiment, the planar shape of the outer surface 31 of the stage 30 is a circle. That is, the stage 30 has a disk shape. Therefore, in this embodiment, the outer surface 31 of the stage 30 is in contact with the side surface 32, and the outer surface 31 and the side surface 32 are in a vertical relationship.
ステージ30の側面32はネジ切り加工されている。すなわち、ステージ30の側面32には雄ネジ33が形成されている。雄ネジ33は、ステージ30の側面32を穴部22の壁面24に直接接触させると共に雌ネジ25に係合することでステージ30を穴部22に固定する係合部である。したがって、図1に示されるように、ステージ30は、ネジ止めにより軸20の穴部22に固定されている。
The side surface 32 of the stage 30 is threaded. That is, a male screw 33 is formed on the side surface 32 of the stage 30. The male screw 33 is an engaging portion that fixes the stage 30 to the hole portion 22 by bringing the side surface 32 of the stage 30 into direct contact with the wall surface 24 of the hole portion 22 and engaging with the female screw 25. Therefore, as shown in FIG. 1, the stage 30 is fixed to the hole 22 of the shaft 20 by screwing.
また、ステージ30の外表面31の径は、軸20の穴部22の径すなわち底面23の径と同じになっている。さらに、ステージ30は、当該ステージ30の外表面31が軸20の表面21と同一平面上に位置するように、穴部22にネジ止めされている。なお、ステージ30の外表面31には当該ステージ30を軸20にネジ止めするために必要な構造が設けられている。
Further, the diameter of the outer surface 31 of the stage 30 is the same as the diameter of the hole 22 of the shaft 20, that is, the diameter of the bottom surface 23. Further, the stage 30 is screwed into the hole 22 so that the outer surface 31 of the stage 30 is located on the same plane as the surface 21 of the shaft 20. The outer surface 31 of the stage 30 is provided with a structure necessary for screwing the stage 30 to the shaft 20.
また、ステージ30が軸20の穴部22から外れにくくするために穴部22の底面23に図示しない接着剤が設けられている。これにより、軸20とステージ30とが接着剤によっても固定されるので、ステージ30のネジ止めの緩みを防止することができる。
Further, an adhesive (not shown) is provided on the bottom surface 23 of the hole 22 so that the stage 30 is not easily detached from the hole 22 of the shaft 20. Thereby, since the axis | shaft 20 and the stage 30 are fixed also with an adhesive agent, the loosening of the screwing of the stage 30 can be prevented.
上記のようなステージ30は、軸20よりもヤング率が低い材質で構成されている。例えば、Al等の金属材料や樹脂等である。これにより、軸20からステージ30に伝わる応力が緩和されるので、穴部22の底面23に接着剤が設けられている場合には接着剤を剥がれにくくすることができる。
The stage 30 as described above is made of a material having a Young's modulus lower than that of the shaft 20. For example, a metal material such as Al or a resin. Thereby, since the stress transmitted from the shaft 20 to the stage 30 is relieved, it is possible to make it difficult to peel off the adhesive when the adhesive is provided on the bottom surface 23 of the hole 22.
センサチップ40は、ステージ30を介して軸20の歪を検出するように構成された歪計測センサである。センサチップ40は、歪を検出するセンシング部を有している。センシング部の歪の検出方式としては、ゲージ抵抗の抵抗値の変化によって歪を検出する歪ゲージ方式や、弾性表面波を用いて歪を検出する弾性表面波(SAW)方式が採用される。センサチップ40は、ステージ30の外表面31に接着剤を介して配置されている。なお、センサチップ40は、リード等の配線を介して外部機器と電気的に接続される。
The sensor chip 40 is a strain measurement sensor configured to detect the strain of the shaft 20 via the stage 30. The sensor chip 40 has a sensing unit that detects strain. As a method for detecting the strain of the sensing unit, a strain gauge method for detecting strain by changing a resistance value of the gauge resistance, or a surface acoustic wave (SAW) method for detecting strain using a surface acoustic wave is adopted. The sensor chip 40 is disposed on the outer surface 31 of the stage 30 via an adhesive. The sensor chip 40 is electrically connected to an external device via wiring such as a lead.
センサチップ40のセンシング部として歪ゲージを採用した場合、軸20の歪を検出してトルクの情報を得るためにはセンサチップ40における各ゲージ抵抗の延びる方向を軸20の長手方向に対して45°に傾ける必要がある。これに対応するため、雄ネジ33や雌ネジ25のネジ切りの位置を調整することにより、ステージ30を軸20の穴部22に締め付けたときにゲージ抵抗の延びる方向が軸20の長手方向に対して45°傾けられるようにする。このように、雄ネジ33及び雌ネジ25のネジ切りの位置を調整することによって軸20に対するステージ30の取り付け角度を任意に設定することもできる。
When a strain gauge is employed as the sensing portion of the sensor chip 40, in order to obtain the torque information by detecting the strain of the shaft 20, the extending direction of each gauge resistance in the sensor chip 40 is 45 with respect to the longitudinal direction of the shaft 20. Need to tilt to °. In order to cope with this, by adjusting the threading position of the male screw 33 and the female screw 25, the direction in which the gauge resistance extends when the stage 30 is fastened to the hole 22 of the shaft 20 is the longitudinal direction of the shaft 20. It should be tilted at 45 ° with respect to it. As described above, the mounting angle of the stage 30 with respect to the shaft 20 can be arbitrarily set by adjusting the positions of threading of the male screw 33 and the female screw 25.
次に、上記のトルクセンサ10の歪検出方法について説明する。軸20に歪が発生すると、歪による応力は軸20内を伝達する。そして、軸20とステージ30との境界部では、軸20の穴部22の壁面24からステージ30の側面32に歪による応力が伝わる。すなわち、歪は、軸20の穴部22の雌ネジ25とステージ30の雄ネジ33との接触部分を介して軸20からステージ30に伝わる。そして、ステージ30に伝わった応力がセンサチップ40のセンシング部によって検出される。
Next, the strain detection method of the torque sensor 10 will be described. When strain is generated in the shaft 20, stress due to the strain is transmitted through the shaft 20. At the boundary between the shaft 20 and the stage 30, stress due to strain is transmitted from the wall surface 24 of the hole portion 22 of the shaft 20 to the side surface 32 of the stage 30. That is, the strain is transmitted from the shaft 20 to the stage 30 through a contact portion between the female screw 25 of the hole 22 of the shaft 20 and the male screw 33 of the stage 30. Then, the stress transmitted to the stage 30 is detected by the sensing unit of the sensor chip 40.
以上説明したように、本実施例では、トルクセンサ10は、ステージ30がネジ形状を有すると共に軸20にネジ止めされる。これにより、軸20で発生した歪による応力が穴部22の壁面24からステージ30の側面32に直接伝わるようにすることができる。すなわち、ステージ30の外表面31の面方向に軸20からステージ30に歪による応力を伝えることができる。また、当該応力によってステージ30が自らを変形させるようにすることができる。したがって、軸20で発生した歪による応力を、センサチップ40に均一に伝えることができる。
As described above, in the present embodiment, the torque sensor 10 is screwed to the shaft 20 while the stage 30 has a screw shape. Thereby, the stress due to the strain generated in the shaft 20 can be directly transmitted from the wall surface 24 of the hole 22 to the side surface 32 of the stage 30. In other words, stress due to strain can be transmitted from the shaft 20 to the stage 30 in the surface direction of the outer surface 31 of the stage 30. Further, the stage 30 can deform itself by the stress. Therefore, the stress due to the strain generated in the shaft 20 can be uniformly transmitted to the sensor chip 40.
例えば、本実施例では、ステージ30の側面32の全体がネジ形状になっているので、ステージ30の側面32の全体が穴部22の壁面24に接触する。これにより、軸20からステージ30への応力の伝達をより均一に伝達させることができる。また、歪によってステージ30をより均一に変位させることができる。
For example, in this embodiment, the entire side surface 32 of the stage 30 has a screw shape, so that the entire side surface 32 of the stage 30 contacts the wall surface 24 of the hole 22. Thereby, the transmission of stress from the shaft 20 to the stage 30 can be transmitted more uniformly. Further, the stage 30 can be displaced more uniformly due to the strain.
そして、本実施例では、ステージ30の外表面31及び軸20の穴部22の平面形状がそれぞれ円形になっている。これにより、平面形状が多角形状の場合に対して、軸20からステージ30に伝わる応力の分散を最も均一にすることができる。さらに、ステージ30の外表面31が軸20の表面21と同一平面上に位置しているので、応力の分散が最も良いというメリットもある。
In this embodiment, the planar shape of the outer surface 31 of the stage 30 and the hole 22 of the shaft 20 is circular. Thereby, the distribution of the stress transmitted from the shaft 20 to the stage 30 can be made most uniform when the planar shape is a polygonal shape. Furthermore, since the outer surface 31 of the stage 30 is located on the same plane as the surface 21 of the shaft 20, there is also an advantage that the stress distribution is the best.
例えば、軸20がエンジンのシャフトの場合にはステージ30を軸20に溶接することは困難であり、作業性を考慮しても溶接の方法は好ましくない。しかしながら、本実施例に係るステージ30は、ステージ30そのものがネジ形状になっていることから、ステージ30を軸20に溶接する必要がない。ステージ30をネジ形状に形成することも容易である。また、溶接や接着剤によってステージ30を軸20に固定する場合よりも容易に軸20にステージ30を固定することができる。もちろん、軸20からステージ30を取り外してセンサチップ40を交換することも可能である。
For example, when the shaft 20 is an engine shaft, it is difficult to weld the stage 30 to the shaft 20, and the welding method is not preferable even in consideration of workability. However, the stage 30 according to the present embodiment does not need to weld the stage 30 to the shaft 20 because the stage 30 itself has a screw shape. It is also easy to form the stage 30 in a screw shape. Further, the stage 30 can be fixed to the shaft 20 more easily than when the stage 30 is fixed to the shaft 20 by welding or an adhesive. Of course, the sensor chip 40 can be replaced by removing the stage 30 from the shaft 20.
なお、本実施例では、雌ネジ25が第1係合部に対応し、雄ネジ33が第2係合部に対応する。
In this embodiment, the female screw 25 corresponds to the first engaging portion, and the male screw 33 corresponds to the second engaging portion.
(第2実施例)
第1実施例と同じ符号は、同一の構成を示すものであって、先行する説明を参照する。本実施例では、第1実施例と異なる部分について説明する。図3に示されるように、軸20の穴部22は、壁面24に、当該壁面24の一部が凹んでいると共に軸20の表面21から底面23側に延びる挿入穴複数の26を有している。 (Second embodiment)
The same reference numerals as those in the first embodiment indicate the same configuration, and the preceding description is referred to. In the present embodiment, parts different from the first embodiment will be described. As shown in FIG. 3, thehole portion 22 of the shaft 20 has a plurality of insertion holes 26 on the wall surface 24, in which a part of the wall surface 24 is recessed and extends from the surface 21 of the shaft 20 toward the bottom surface 23. ing.
第1実施例と同じ符号は、同一の構成を示すものであって、先行する説明を参照する。本実施例では、第1実施例と異なる部分について説明する。図3に示されるように、軸20の穴部22は、壁面24に、当該壁面24の一部が凹んでいると共に軸20の表面21から底面23側に延びる挿入穴複数の26を有している。 (Second embodiment)
The same reference numerals as those in the first embodiment indicate the same configuration, and the preceding description is referred to. In the present embodiment, parts different from the first embodiment will be described. As shown in FIG. 3, the
本実施例では、挿入穴26は軸20の表面21から底面23側に一定の長さを持つと共に、挿入穴26のうち底面23側の端部から底面23の周方向に一定の長さを持った溝部である。言い換えると、穴部22の壁面24にL字状の溝部が形成されている。
In this embodiment, the insertion hole 26 has a certain length from the surface 21 of the shaft 20 to the bottom surface 23 side, and has a certain length in the circumferential direction of the bottom surface 23 from the end of the insertion hole 26 on the bottom surface 23 side. It has a groove. In other words, an L-shaped groove is formed on the wall surface 24 of the hole 22.
一方、ステージ30は、側面32に当該側面32の一部が突出した複数の突起部34を有している。本実施例では、突起部34は円柱状をなしている。突起部34におけるステージ30の外表面31の周方向の幅は、挿入穴26における軸20の穴部22の底面23の周方向の幅と同等以下になっている。また、突起部34の高さは挿入穴26の深さと同等以上になっている。ステージ30の外表面31の径は軸20の穴部22の底面23の径と同じになっている。
On the other hand, the stage 30 has a plurality of protrusions 34 on the side surface 32 with a part of the side surface 32 protruding. In the present embodiment, the protrusion 34 has a cylindrical shape. The circumferential width of the outer surface 31 of the stage 30 in the protrusion 34 is equal to or less than the circumferential width of the bottom surface 23 of the hole 22 of the shaft 20 in the insertion hole 26. Further, the height of the protrusion 34 is equal to or greater than the depth of the insertion hole 26. The diameter of the outer surface 31 of the stage 30 is the same as the diameter of the bottom surface 23 of the hole 22 of the shaft 20.
本実施例では、挿入穴26及び突起部34は穴部22及びステージ30にそれぞれ4カ所ずつ設けられている。また、各突起部34は各挿入穴26に対応した位置に形成されている。そして、ステージ30の各突起部34が対応する挿入穴26に差し込まれると共に挿入穴26内を挿入穴26に沿って終端部まで移動することでステージ30が穴部22に固定される。このようして、図1に示されるようにステージ30が軸20に固定される。
In this embodiment, four insertion holes 26 and four protrusions 34 are provided in the hole 22 and the stage 30, respectively. Each projection 34 is formed at a position corresponding to each insertion hole 26. The projections 34 of the stage 30 are inserted into the corresponding insertion holes 26, and the stage 30 is fixed to the holes 22 by moving through the insertion holes 26 to the end portions along the insertion holes 26. In this way, the stage 30 is fixed to the shaft 20 as shown in FIG.
以上の構成により、ステージ30の突起部34の先端と側面32が穴部22の壁面24に接触するので、ステージ30の外表面31の面方向に沿って軸20からステージ30に歪による応力を均一に伝えることができる。また、当該応力をセンサチップ40に均一に伝えることができる。
With the above configuration, since the tip and the side surface 32 of the projection 34 of the stage 30 are in contact with the wall surface 24 of the hole 22, stress due to strain is applied from the shaft 20 to the stage 30 along the surface direction of the outer surface 31 of the stage 30. Can communicate evenly. Further, the stress can be uniformly transmitted to the sensor chip 40.
なお、本実施例では、挿入穴26が第1係合部に対応し、突起部34が第2係合部に対応する。
In this embodiment, the insertion hole 26 corresponds to the first engagement portion, and the protrusion 34 corresponds to the second engagement portion.
(第3実施例)
第1、第2実施例と同じ符号は、同一の構成を示すものであって、先行する説明を参照する。本実施例では、第1、第2実施例と異なる部分について説明する。図4に示されるように、軸20の穴部22は、壁面24に、当該壁面24の一部が凹んだ複数の嵌合穴27を有している。一方、ステージ30は、側面32に当該側面32の一部が突出した複数の嵌合部35を有している。 (Third embodiment)
The same reference numerals as those in the first and second embodiments indicate the same configuration, and refer to the preceding description. In the present embodiment, parts different from the first and second embodiments will be described. As shown in FIG. 4, thehole portion 22 of the shaft 20 has a plurality of fitting holes 27 in which a part of the wall surface 24 is recessed in the wall surface 24. On the other hand, the stage 30 has a plurality of fitting portions 35 in which a part of the side surface 32 protrudes on the side surface 32.
第1、第2実施例と同じ符号は、同一の構成を示すものであって、先行する説明を参照する。本実施例では、第1、第2実施例と異なる部分について説明する。図4に示されるように、軸20の穴部22は、壁面24に、当該壁面24の一部が凹んだ複数の嵌合穴27を有している。一方、ステージ30は、側面32に当該側面32の一部が突出した複数の嵌合部35を有している。 (Third embodiment)
The same reference numerals as those in the first and second embodiments indicate the same configuration, and refer to the preceding description. In the present embodiment, parts different from the first and second embodiments will be described. As shown in FIG. 4, the
本実施例では、嵌合部35は三角柱であり、嵌合穴27は三角柱状の溝をなしている。また、嵌合部35の平面形状と嵌合穴27の平面形状は同じであり、嵌合部35の平面サイズは嵌合穴27の平面サイズと同等以下になっている。さらに、嵌合部35の高さは嵌合穴27の深さと同等以上になっている。嵌合穴27及び嵌合部35は穴部22及びステージ30にそれぞれ4カ所ずつ設けられている。各嵌合部35は各嵌合穴27に対応した位置に形成されている。
In this embodiment, the fitting portion 35 is a triangular prism, and the fitting hole 27 is a triangular prism-shaped groove. Further, the planar shape of the fitting portion 35 and the planar shape of the fitting hole 27 are the same, and the planar size of the fitting portion 35 is equal to or smaller than the planar size of the fitting hole 27. Further, the height of the fitting portion 35 is equal to or greater than the depth of the fitting hole 27. Four fitting holes 27 and four fitting portions 35 are provided in each of the hole portion 22 and the stage 30. Each fitting portion 35 is formed at a position corresponding to each fitting hole 27.
そして、ステージ30が穴部22に圧入等によって差し込まれると、嵌合部35が嵌合穴27に嵌め込まれて動けなくなる。すなわち、嵌合部35が嵌合穴27に強接合される。言い換えると、嵌合部35は嵌合穴27によって嵌め殺しの状態となる。これにより、ステージ30は穴部22に対して固定される。
When the stage 30 is inserted into the hole 22 by press fitting or the like, the fitting part 35 is fitted into the fitting hole 27 and cannot move. That is, the fitting part 35 is strongly joined to the fitting hole 27. In other words, the fitting portion 35 is put into a fitted and killed state by the fitting hole 27. Thereby, the stage 30 is fixed to the hole 22.
以上により、ステージ30の側面32と軸20の穴部22の壁面24を接触させて、軸20からステージ30に歪による応力を均一に伝えるようにすることができる。
As described above, the side surface 32 of the stage 30 and the wall surface 24 of the hole portion 22 of the shaft 20 can be brought into contact with each other so that stress due to strain can be uniformly transmitted from the shaft 20 to the stage 30.
なお、本実施例では、嵌合穴27が第1係合部に対応し、嵌合部35が第2係合部に対応する。
In this embodiment, the fitting hole 27 corresponds to the first engaging portion, and the fitting portion 35 corresponds to the second engaging portion.
(他の実施例)
上記各実施例で示されたトルクセンサ10の構成は一例であり、上記で示した構成に限定されることなく、本開示を実現できる他の構成とすることもできる。例えば、トルクセンサ10は車両に用いられるものであったが、これはトルクセンサ10の利用形態の一例であり、もちろん車両以外にも用いることができる。 (Other examples)
The configuration of thetorque sensor 10 shown in each of the above embodiments is an example, and is not limited to the configuration shown above, and may be another configuration that can realize the present disclosure. For example, although the torque sensor 10 is used for a vehicle, this is an example of a usage form of the torque sensor 10, and of course, it can be used for other than the vehicle.
上記各実施例で示されたトルクセンサ10の構成は一例であり、上記で示した構成に限定されることなく、本開示を実現できる他の構成とすることもできる。例えば、トルクセンサ10は車両に用いられるものであったが、これはトルクセンサ10の利用形態の一例であり、もちろん車両以外にも用いることができる。 (Other examples)
The configuration of the
第1実施例では、ステージ30自体がネジ形状になっていたが、例えば図5(a)に示されるように、ステージ30の外表面31に六角の穴を設けてその穴にセンサチップ40を配置しても良い。これにより、ステージ30を軸20に取り付けやすくすることができる。また、図5(b)に示されるように、ステージ30自体がボルトになっていても良い。さらに、図5(c)に示されるように、ボルト部分に穴を設けて、穴の底をステージ30の外表面31としてしても良い。これにより、センサチップ40を保護することができる。一方、図6に示されるように、ステージ30は円柱状ではなく、円錐台状又は円錐状になっていても良い。この場合、ステージ30の外表面31と側面32とは所定の角度で傾けられた関係となる。これは、ステージ30に突起部34や嵌合部35が設けられたものでも可能である。
In the first embodiment, the stage 30 itself has a screw shape. For example, as shown in FIG. 5A, a hexagonal hole is provided in the outer surface 31 of the stage 30, and the sensor chip 40 is placed in the hole. It may be arranged. Thereby, the stage 30 can be easily attached to the shaft 20. Further, as shown in FIG. 5B, the stage 30 itself may be a bolt. Further, as shown in FIG. 5C, a hole may be provided in the bolt portion, and the bottom of the hole may be used as the outer surface 31 of the stage 30. Thereby, the sensor chip 40 can be protected. On the other hand, as shown in FIG. 6, the stage 30 may have a truncated cone shape or a cone shape instead of the columnar shape. In this case, the outer surface 31 and the side surface 32 of the stage 30 are in a relationship inclined at a predetermined angle. This is possible even if the stage 30 is provided with the protrusion 34 and the fitting portion 35.
第2実施例では、円柱状の突起部34が採用されていたが、これは突起部34の一例である。したがって、突起部34は多角柱でも良い。また、挿入穴26の形状についてもL字状に限らず他の形状になっていても良い。第3実施例で示された嵌合部35についても同様に、嵌合部35は三角柱以外の多角柱や円柱でも良い。さらに、突起部34や嵌合部35の数や位置についても上記の実施例のように限定されることなく、適宜設定すれば良い。
In the second embodiment, the cylindrical protrusion 34 is adopted, but this is an example of the protrusion 34. Therefore, the protrusion 34 may be a polygonal column. Further, the shape of the insertion hole 26 is not limited to the L shape, and may be other shapes. Similarly, for the fitting portion 35 shown in the third embodiment, the fitting portion 35 may be a polygonal column or a cylinder other than the triangular column. Furthermore, the numbers and positions of the protrusions 34 and the fitting portions 35 are not limited as in the above embodiment, and may be set as appropriate.
上記各実施例では、ステージ30の外表面31と軸20の表面21とが同一平面上に位置していたが、これは軸20に対するステージ30の固定の一例である。したがって、ステージ30が軸20に取り付けられたときにステージ30の一部が軸20の表面21と一致していなくても良い。例えば、ステージ30の外表面31が軸20の表面21から突出していても良い。
In each of the above embodiments, the outer surface 31 of the stage 30 and the surface 21 of the shaft 20 are located on the same plane, but this is an example of fixing the stage 30 to the shaft 20. Therefore, when the stage 30 is attached to the shaft 20, a part of the stage 30 may not coincide with the surface 21 of the shaft 20. For example, the outer surface 31 of the stage 30 may protrude from the surface 21 of the shaft 20.
本開示は、実施例に準拠して記述されたが、本開示は当該実施例や構造に限定されるものではないと理解される。本開示は、様々な変形例や均等範囲内の変形をも包含する。加えて、様々な組み合わせや形態、さらには、それらに一要素のみ、それ以上、あるいはそれ以下、を含む他の組み合わせや形態をも、本開示の範疇や思想範囲に入るものである。
Although the present disclosure has been described based on the embodiments, it is understood that the present disclosure is not limited to the embodiments and structures. The present disclosure includes various modifications and modifications within the equivalent range. In addition, various combinations and forms, as well as other combinations and forms including only one element, more or less, are within the scope and spirit of the present disclosure.
Claims (7)
- 歪を測定するトルクセンサであって、
表面(21)の一部が凹んだことにより底面(23)とこの底面(23)及び前記表面(21)に接する壁面(24)とで構成された穴部(22)を有し、上記歪を発生する軸(20)と、
外表面(31)と前記外表面(31)に対して傾けられた側面(32)とを有すると共に、前記軸(20)の穴部(22)に配置されるステージ(30)と、
前記ステージ(30)の外表面(31)に設置されていると共に、前記ステージ(30)を介して前記軸(20)の歪を検出するセンサチップ(40)と、
を備え、
前記軸(20)の穴部(22)は、前記壁面(24)に、前記ステージ(30)を固定する第1係合部(25、26、27)を有し、
前記ステージ(30)は、前記側面(32)に、当該側面(32)を前記穴部(22)の壁面(24)に直接接触させると共に、前記第1係合部(25、26、27)に係合することで当該ステージ(30)を前記穴部(22)に固定する第2係合部(33、34、35)を有しているトルクセンサ。 A torque sensor for measuring strain,
Since the surface (21) is partially recessed, it has a hole (22) composed of a bottom surface (23) and a wall surface (24) in contact with the bottom surface (23) and the surface (21), and the distortion An axis (20) for generating
A stage (30) having an outer surface (31) and a side surface (32) inclined with respect to the outer surface (31) and disposed in a hole (22) of the shaft (20);
A sensor chip (40) installed on the outer surface (31) of the stage (30) and detecting strain of the shaft (20) via the stage (30);
With
The hole (22) of the shaft (20) has a first engagement portion (25, 26, 27) for fixing the stage (30) to the wall surface (24),
The stage (30) causes the side surface (32) to directly contact the side surface (32) to the wall surface (24) of the hole (22) and the first engaging portion (25, 26, 27). A torque sensor having a second engagement portion (33, 34, 35) for fixing the stage (30) to the hole portion (22) by engaging with the hole. - 前記第1係合部は、前記軸(20)の壁面(24)に形成された雌ネジ(25)であり、
前記第2係合部は、前記ステージ(30)の側面(32)に設けられた雄ネジ(33)であり、
前記ステージ(30)は、前記雌ネジ(25)と前記雄ネジ(33)のネジ止めにより前記穴部(22)に対して固定されている請求項1に記載のトルクセンサ。 The first engaging portion is a female screw (25) formed on the wall surface (24) of the shaft (20),
The second engaging portion is a male screw (33) provided on a side surface (32) of the stage (30),
The torque sensor according to claim 1, wherein the stage (30) is fixed to the hole (22) by screwing the female screw (25) and the male screw (33). - 前記第1係合部(25、26、27)は、前記穴部(22)の壁面(24)に形成されていると共に前記軸(20)の表面(21)から前記底面(23)側に延びる挿入穴(26)であり、
前記第2係合部は、前記ステージ(30)の側面(32)の一部が突出した突起部(34)であり、
前記ステージ(30)は、前記突起部(34)が前記挿入穴(26)に差し込まれることにより前記穴部(22)に対して固定されている請求項1に記載のトルクセンサ。 The first engaging portions (25, 26, 27) are formed on the wall surface (24) of the hole portion (22) and from the surface (21) of the shaft (20) to the bottom surface (23) side. An extending insertion hole (26),
The second engaging portion is a protrusion (34) from which a part of the side surface (32) of the stage (30) protrudes,
The torque sensor according to claim 1, wherein the stage (30) is fixed to the hole (22) by inserting the protrusion (34) into the insertion hole (26). - 前記第1係合部は、前記穴部(22)の壁面(24)の一部が凹んだ嵌合穴(27)であり、
前記第2係合部は、前記ステージ(30)の側面(32)の一部が突出した嵌合部(35)であり、
前記ステージ(30)は、前記嵌合部(35)が前記穴部(22)の嵌合穴(27)に嵌め込まれることにより前記穴部(22)に対して固定されている請求項1に記載のトルクセンサ。 The first engagement part is a fitting hole (27) in which a part of the wall surface (24) of the hole part (22) is recessed,
The second engagement portion is a fitting portion (35) in which a part of the side surface (32) of the stage (30) protrudes,
The stage (30) is fixed to the hole (22) by fitting the fitting part (35) into the fitting hole (27) of the hole part (22). The described torque sensor. - 前記ステージ(30)は、当該ステージ(30)の外表面(31)が円形であると共に、前記軸(20)の表面(21)における平面形状が円形である前記穴部(22)に固定されている請求項1ないし4のいずれか1つに記載のトルクセンサ。 The stage (30) is fixed to the hole (22) in which the outer surface (31) of the stage (30) is circular and the planar shape of the surface (21) of the shaft (20) is circular. The torque sensor according to any one of claims 1 to 4.
- 前記ステージ(30)は、前記軸(20)よりもヤング率が低い請求項1ないし5のいずれか1つに記載のトルクセンサ。 The torque sensor according to any one of claims 1 to 5, wherein the stage (30) has a Young's modulus lower than that of the shaft (20).
- 前記ステージ(30)は、当該ステージ(30)の外表面(31)が前記軸(20)の表面(21)と同一平面上に位置するように、前記穴部(22)に固定されている請求項1ないし6のいずれか1つに記載のトルクセンサ。 The stage (30) is fixed to the hole (22) so that the outer surface (31) of the stage (30) is located on the same plane as the surface (21) of the shaft (20). The torque sensor according to any one of claims 1 to 6.
Applications Claiming Priority (2)
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JP2013081945A JP2014202727A (en) | 2013-04-10 | 2013-04-10 | Torque sensor |
JP2013-081945 | 2013-04-10 |
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WO2014167823A1 true WO2014167823A1 (en) | 2014-10-16 |
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DE102015201577A1 (en) * | 2015-01-29 | 2016-08-04 | Robert Bosch Gmbh | Sensor arrangement for the indirect detection of a torque of a rotatably mounted shaft |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2050624A (en) * | 1979-05-11 | 1981-01-07 | Barnett J D | Strain transducers |
JP2000146721A (en) * | 1998-11-05 | 2000-05-26 | Nsk Ltd | Torque sensor |
JP2001070146A (en) * | 1999-07-07 | 2001-03-21 | Mitsubishi Electric Corp | Sensor attaching device |
JP2003194508A (en) * | 2001-12-26 | 2003-07-09 | Mitsubishi Heavy Ind Ltd | Strain measuring method, device and system thereof |
US20050194185A1 (en) * | 2004-03-04 | 2005-09-08 | Halliburton Energy Services | Multiple distributed force measurements |
US20070039396A1 (en) * | 2005-08-22 | 2007-02-22 | Honeywell International Inc. | Torque sensor packaging systems and methods |
DE102006057225A1 (en) * | 2006-09-04 | 2008-03-06 | Continental Teves Ag & Co. Ohg | Sensor arrangement for use as torque sensor in motor vehicle steering system, has sensor unit arranged at carrier module that is arranged in recess of shaft or in form of foil formed at shaft, where module is fitted and connected in shaft |
-
2013
- 2013-04-10 JP JP2013081945A patent/JP2014202727A/en active Pending
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2014
- 2014-04-07 WO PCT/JP2014/001978 patent/WO2014167823A1/en active Application Filing
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2050624A (en) * | 1979-05-11 | 1981-01-07 | Barnett J D | Strain transducers |
JP2000146721A (en) * | 1998-11-05 | 2000-05-26 | Nsk Ltd | Torque sensor |
JP2001070146A (en) * | 1999-07-07 | 2001-03-21 | Mitsubishi Electric Corp | Sensor attaching device |
JP2003194508A (en) * | 2001-12-26 | 2003-07-09 | Mitsubishi Heavy Ind Ltd | Strain measuring method, device and system thereof |
US20050194185A1 (en) * | 2004-03-04 | 2005-09-08 | Halliburton Energy Services | Multiple distributed force measurements |
US20070039396A1 (en) * | 2005-08-22 | 2007-02-22 | Honeywell International Inc. | Torque sensor packaging systems and methods |
DE102006057225A1 (en) * | 2006-09-04 | 2008-03-06 | Continental Teves Ag & Co. Ohg | Sensor arrangement for use as torque sensor in motor vehicle steering system, has sensor unit arranged at carrier module that is arranged in recess of shaft or in form of foil formed at shaft, where module is fitted and connected in shaft |
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