WO2021241717A1 - Stroke sensor - Google Patents

Stroke sensor Download PDF

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Publication number
WO2021241717A1
WO2021241717A1 PCT/JP2021/020327 JP2021020327W WO2021241717A1 WO 2021241717 A1 WO2021241717 A1 WO 2021241717A1 JP 2021020327 W JP2021020327 W JP 2021020327W WO 2021241717 A1 WO2021241717 A1 WO 2021241717A1
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WO
WIPO (PCT)
Prior art keywords
stroke sensor
detection shaft
housing
detection element
magnetic
Prior art date
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PCT/JP2021/020327
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French (fr)
Japanese (ja)
Inventor
龍二 吉田
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日本精機株式会社
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Publication date
Application filed by 日本精機株式会社 filed Critical 日本精機株式会社
Priority to JP2022526654A priority Critical patent/JPWO2021241717A1/ja
Publication of WO2021241717A1 publication Critical patent/WO2021241717A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/245—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train

Definitions

  • the present invention relates to a stroke sensor.
  • Patent Document 1 As a displacement sensor for detecting the linear motion of a magnetic material, for example, there is one disclosed in Patent Document 1.
  • the displacement sensor of Patent Document 1 is composed of a plurality of divided coils wound around the bobbin, and converts the displacement amount of the movable body into an electric amount for differential detection.
  • the moving direction detecting device for a magnetic material disclosed in Patent Document 2 two or more magnetic sensors provided with a magnet for applying a bias magnetic field along the moving direction of the uneven magnetic moving body are arranged.
  • Patent Documents 1 and 2 has a problem that the cost is high when applied to a stroke sensor that detects linear motion in one direction.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a stroke sensor having a simplified structure and a low cost.
  • the stroke sensor according to the present invention is A stroke sensor that detects the amount of movement of the detection shaft that follows the object to be detected and moves from the origin position.
  • the detection shaft which is made of a soft magnetic material and has a large diameter, A spring that comes into contact with the large diameter portion at one end and returns the detection shaft to the origin position after moving from the origin position.
  • a magnet that generates a magnetic field and A magnetic detection element for detecting the magnetic field is provided.
  • the magnetic detection element is arranged between the large diameter portion and the magnet. It is characterized by that.
  • FIG. 1 shows a cross-sectional view of the first to third aspects of the stroke sensor 1.
  • the stroke sensor 1 includes a detection shaft 10, a first housing 20, a second housing 30, a spring 40, a magnet 51, and a magnetic detection element 52.
  • the detection shaft 10 is a detection medium that is followed by the movement of the detected body.
  • the detection shaft 10 is connected to the detected body, an external force is transmitted, and the detection shaft 10 reciprocates and follows in the axial direction.
  • the detection shaft 10 is preferably made of a soft magnetic material having a certain degree of rigidity, and is made of, for example, ferritic stainless steel (SUS430).
  • the detection shaft 10 has a columnar large diameter portion 11 and a middle diameter portion 12 having different diameters, and the large diameter portion 11 is configured in the direction of the first housing 20. Further, the airtight member 15 is attached to the detection shaft 10.
  • the detection shaft 10 may be formed by cutting a rod-shaped workpiece, or may be formed by casting or injection molding.
  • the large diameter portion 11 is a disk-shaped portion having the largest diameter in the detection shaft 10, and is in contact with the end portion 41 of the spring 40.
  • the large diameter portion 11 has an upper end 11a (direction of the first housing 20), a lower end 11b (direction of the second housing 30), and an intermediate point 11c intermediate between the upper end 11a and the lower end 11b with respect to the thickness direction thereof. Has.
  • the large diameter portion 11 of the detection shaft 10 may be provided with a recess 11d.
  • the stroke sensor 1 facilitates the holding of the detection shaft 10 by aligning the tip of the jig made of the magnetic material with the recess 11d, and further, the middle diameter portion 12 of the detection shaft 10 is the second housing 30 described later. It is easy to pass through the shaft hole 32 of the stroke sensor 1, and the workability and accuracy of assembling the stroke sensor 1 can be improved with a simple configuration.
  • the recess 11d is smaller than the inner diameter of the spring 40, it does not affect the contact between the large diameter portion 11 and the end portion 41 of the spring 40, and prevents the influence on the movement of the detection shaft 10.
  • the recess 11d may have any shape such as a circle, a square, or a polygon.
  • the middle diameter portion 12 is a portion having a smaller diameter than the large diameter portion 11 of the detection shaft 10.
  • the middle diameter portion 12 projects outward from the shaft hole 32 of the second housing 30 and is connected to a detected body (not shown).
  • the airtight member 15 is an O-ring made of rubber and is held by a groove provided in the middle diameter portion 12.
  • the airtight member 15 is used to maintain the airtightness of the stroke sensor 1, and the groove is configured to satisfy the groove structure necessary for exerting the airtight function of the airtight member 15.
  • the first housing 20 includes a lid portion 21, a mounting portion 22, a first side wall 24, a first receiving portion 25, and a first screw portion 29.
  • the first housing 20 is preferably made of a non-magnetic material such as aluminum or stainless steel, and is formed in a substantially cylindrical shape by the lid portion 21 and the first side wall 24.
  • the first housing 20 in the first aspect may be provided with a taper on the inside as a draft for preventing interference with the spring 40 and for forming a mold.
  • the lid portion 21 is a lid-shaped portion of the first housing 20.
  • the lid portion 21 is in contact with the end portion 42 of the spring 40.
  • the mounting portion 22 is a portion for fixing and mounting the stroke sensor 1, and is a groove provided in the lid portion 21.
  • a female screw is formed in the opening of the mounting portion 22, and the mounting portion 22 is connected to a male screw formed in the fixing target.
  • a known fixing method such as press-fitting of a shaft or bonding with an adhesive can be appropriately used.
  • the first side wall 24 is formed by extending from the lid portion 21 and constitutes the side surface of the first housing 20.
  • the first receiving portion 25 is a surface formed on the side opposite to the lid portion 21 of the first side wall 24, receives the large diameter portion 11 of the detection shaft 10, and limits the movement amount S of the detection shaft 10. ..
  • the length from the large diameter portion 11 to the first receiving portion 25 at the origin position O is configured to be smaller than the maximum amount of deflection of the spring 40.
  • the first screw portion 29 is a screw thread provided inside the first side wall 24, and for example, a male screw is formed.
  • the first screw portion 29 is fitted with a second screw portion 39, which will be described later, and screw-tightened to connect the first housing 20 and the second housing 30.
  • the second housing 30 includes a second receiving portion 31, a shaft hole 32, a second side wall 34, and a second screw portion 39.
  • the second housing 30 is preferably made of a non-magnetic material such as aluminum or stainless steel, and is formed in a substantially cup shape.
  • the second receiving portion 31 is provided at the bottom of the second housing 30, receives the large diameter portion 11 of the detection shaft 10, and keeps the detection shaft 10 at the origin position O.
  • the shaft hole 32 supports the middle diameter portion 12 of the detection shaft 10 and is taken out to the outside.
  • the second side wall 34 is formed so as to stand from the second receiving portion 31, and constitutes the side surface of the second housing 30.
  • the second screw portion 39 is a screw thread provided on the outside of the second side wall 34, and for example, a male screw is formed.
  • the tightening direction of the first screw portion 29 and the second screw portion 39 is the same as the winding direction of the spring 40.
  • the stroke sensor 1 prevents the spring 40 from being twisted and damaged in the direction opposite to the winding direction when the first housing 20 and the second housing 30 are connected.
  • the spring 40 is preferably a stainless steel wire, an oil tempered wire made of iron or an iron alloy, or the like, and is composed of, for example, a cylindrical coil spring made of SUS304WPB, SWOSC-B, SWOSC-V, or the like.
  • the spring 40 may be coated with a semi-solid or semi-fluid lubricant (for example, grease) (not shown) for the purpose of rust prevention and lubrication.
  • One end 41 of the spring 40 is in contact with the large diameter portion 11 of the detection shaft 10, and the other end 42 is in contact with the lid portion 21 of the first housing 20.
  • the large diameter portion 11 pushes the spring 40, and the lid portion 21 supports the spring 40, whereby the spring 40 Is crushed, and the large diameter portion 11 of the detection shaft 10 can be moved by the amount of movement S until it hits the first receiving portion 25 of the first housing 20. Then, when the force for pushing the detection shaft 10 disappears, the spring force accumulated in the spring 40 moves so as to return to the direction of the second housing 30, and the large diameter portion 11 of the detection shaft 10 becomes the second receiving portion 31. It returns to the origin position O by hitting.
  • the magnet 51 is made of, for example, a rare earth magnet formed in a prismatic shape (for example, a magnet made of a material such as SmCo or NdFeB), and provides a magnetic field to a magnetic detection element 52 described later.
  • the magnet 51 may be a sintered magnet, a plastic magnet mixed with plastic and compressed or molded by a manufacturing method, or the like. While sintered magnets have stronger magnetic force, plastic magnets have characteristics such as higher mass productivity and crack resistance, so they may be appropriately selected according to usage conditions and design requirements.
  • the magnetic detection element 52 is for detecting changes in the position and movement amount of the object to be detected by the direction and strength of the magnetic field, and is composed of, for example, a Hall element or the like.
  • the magnetic detection element 52 is arranged between the detection shaft 10 and the magnet 51, and the distance between the magnet 51 and the magnetic detection element 52 is arranged so as to be as small as possible.
  • the magnetic detection element 52 changes the direction and strength of the magnetic field applied to the magnetic detection element 52 by the magnet 51 by moving the detection shaft 10 which is a soft magnetic material, and detects the result as the movement amount S.
  • the stroke sensor 1 can simplify the structure and detect the movement of the detection shaft by a simple method.
  • the substrate 53 is a printed circuit board (Printed Circuit Board; PCB) made of glass epoxy or the like, and includes a magnet 51 and a magnetic detection element 52. Taking in the power supply to the magnetic detection element 52 of the substrate 53 and outputting the electric signal to the outside are performed by an electric cord (not shown) connected to the substrate 53. A direct connector, a coupler, or the like may be used instead of the electric cord for taking in the power supply to the magnetic detection element 52 of the substrate 53 and outputting the electric signal to the outside.
  • PCB printed circuit Board
  • the board storage portion 50 is provided integrally with the second housing 30.
  • the substrate accommodating portion 50 may be integrated with the second housing 30 by insert molding, or may be joined as a separate body with an adhesive.
  • the board storage unit 50 houses the magnet 51, the magnetic detection element 52, and the board 53.
  • sealing member 60 for example, an epoxy resin or the like is used.
  • the sealing member 60 is injected into the substrate accommodating portion 50 and cured to hermetically seal the magnet 51, the magnetic detection element 52, and the substrate 53.
  • FIG. 2 is a diagram showing the positional relationship between the detection shaft 10 and the magnetic detection element 52 of the first aspect of the stroke sensor 1.
  • the large diameter portion 11 and the magnetic detection element 52 are drawn with the size emphasized for the sake of clarity, and the other elements are not drawn.
  • the magnetic detection element 52 is arranged higher than the midpoint 11c of the large diameter portion 11 of the detection shaft 10 at the origin position O and below the upper end 11a.
  • the output of the magnetic detection element 52 increases as the detection shaft 10 moves and the intermediate point 11c approaches.
  • the stroke sensor 1 can detect the movement of the detection shaft 10 by a simple method with a simplified structure.
  • the position of the magnetic detection element 52 in the first aspect is the center position 52c of the magnetic detection element 52, and a part of the magnetic detection element 52 may exceed the upper end 11a.
  • the stroke sensor 1 when the detection shaft 10 is at the origin position O, the distance from the intermediate point 11c to the center position 52c of the magnetic detection element 52 is from the distance from the upper end 11a to the first receiving portion 25. Is also preferred to be short. As a result, the stroke sensor 1 can reliably detect the point where the intermediate point 11c and the center position 52c coincide with each other and the output of the magnetic detection element 52 becomes maximum.
  • FIG. 3 shows the positional relationship between the detection shaft 10 and the magnetic detection element 52 of the second aspect of the stroke sensor 1.
  • the large diameter portion 11 and the magnetic detection element 52 are drawn with the size emphasized for the sake of clarity, and the other elements are not drawn.
  • the magnetic detection element 52 is arranged below the midpoint 11c of the large diameter portion 11 of the detection shaft 10 at the origin position O and above the lower end 11b.
  • the output of the magnetic detection element 52 is the largest at the origin position O, and the output of the magnetic detection element 52 decreases as the detection shaft 10 moves and the intermediate point 11c separates.
  • the stroke sensor 1 can detect the movement of the detection shaft 10 by a simple method with a simplified structure.
  • the stroke sensor 1 since the distance between the magnetic detection element 52 and the upper end 11a is larger than in the first aspect, the influence of the spring 40 on the magnetic field formed by the magnet 51 and the large diameter portion 11 can be further reduced. ..
  • the position of the magnetic detection element 52 in the second aspect is the center position 52c of the magnetic detection element 52, and a part of the magnetic detection element 52 may exceed the intermediate point 11c.
  • FIG. 4 shows the positional relationship between the detection shaft 10 and the magnetic detection element 52 of the third aspect of the stroke sensor 1.
  • the large diameter portion 11 and the detection element 52 are drawn with the size emphasized for the sake of clarity, and the other elements are not drawn.
  • the magnetic detection element 52 is arranged below the lower end 11b of the large diameter portion 11 of the detection shaft 10.
  • the output of the magnetic detection element 52 is the largest at the origin position O, and the output of the magnetic detection element 52 decreases as the detection shaft 10 moves and the lower end 11b separates.
  • the stroke sensor 1 can simplify the structure and detect the movement of the detection shaft 10 at low cost.
  • the distance between the magnetic detection element 52 and the upper end 11a is larger than in the first and second aspects, the influence of the spring 40 on the magnetic field formed by the magnet 51 and the large diameter portion 11 is further reduced. be able to.
  • the position of the magnetic detection element 52 in the third aspect is the center position 52c of the magnetic detection element 52, and a part of the magnetic detection element 52 may exceed the lower end 11b.
  • a stroke sensor 1 that detects the amount of movement S of the detection shaft 10 that follows the object to be detected and moves from the origin position O.
  • a detection shaft 10 made of a soft magnetic material and having a large diameter portion 11 and A spring 40 that comes into contact with the large diameter portion 11 at one end 41 and returns the detection shaft 10 after moving from the origin position O to the origin position O.
  • a magnet 51 that generates a magnetic field and A magnetic detection element 52 for detecting the magnetic field is provided. The magnetic detection element 52 is arranged between the detection shaft 10 and the magnet 51.
  • the stroke sensor 1 can detect the movement of the detection shaft 10 by a simple method by simplifying the structure by detecting the change in the magnetic field generated by the detection shaft 10 and the magnet 51.
  • the large diameter portion 11 has an upper end 11a in the direction of the spring 40, a lower end 11b on the opposite side of the upper end 11a, an intermediate point 11c between the upper end 11a and the lower end 11b, and a middle diameter portion 12 continuous from the lower end 11b. death,
  • the magnetic detection element 52 is located in the direction of the middle diameter portion 12 with respect to the upper end 11a.
  • the stroke sensor 1 can detect the movement of the detection shaft 10 by a simple method by simplifying the structure by detecting the movement of the large diameter portion 11.
  • the magnetic detection element 52 is located below the upper end 11a and in the direction of the upper end 11a from the intermediate point 11c.
  • the stroke sensor 1 can detect the movement of the detection shaft 10 by a simple method by simplifying the structure by increasing the output due to the approach of the intermediate point 11c.
  • the magnetic detection element 52 is located below the intermediate point 11c and in the direction of the upper end 11a with respect to the lower end 11b.
  • the stroke sensor 1 can detect the movement of the detection shaft 10 by a simple method by simplifying the structure by reducing the output due to the separation of the intermediate point 11c, and the spring 40 is formed by the magnet 51 and the large diameter portion 11. The effect on the magnetic field can be made smaller.
  • the magnetic detection element 52 is located in the direction of the middle diameter portion 12 with respect to the lower end 11b.
  • the stroke sensor 1 can detect the movement of the detection shaft 10 by a simple method by simplifying the structure by reducing the output due to the separation of the lower end 11b, and the spring 40 is a magnetic field formed by the magnet 51 and the large diameter portion 11. The effect on can be made smaller.
  • the stroke sensor 1 can prevent damage when connecting the first housing 20 and the second housing 30 of the spring 40, simplify the structure, and detect the movement of the detection shaft 10 by a simple method.
  • the detection shaft 10 has a recess 11d in the large diameter portion 11 which is smaller than the inner diameter of the spring 40.
  • the stroke sensor 1 has a recess 11d that facilitates holding of the detection shaft 10 during assembly, and can improve the workability and accuracy of assembly with a simple configuration.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

A stroke sensor is provided which has a simplified structure and which detects movement of a detection shaft with a simple method. The stroke sensor 1 detects the amount of movement S of a detection shaft 10 which moves from an origin position O following an object to be detected, wherein the stroke sensor is provided with a detection shaft 10 which is formed from a soft magnetic material and which has a large-diameter section 11, a spring 40 which at one end 41 contacts the large-diameter section 11 and which moves the detection shaft 10 back to the origin position O after said detection shaft has moved away from the origin position O, a magnet 51 which generates a magnetic field, and a magnetic detector 52 which detects said magnetic field, wherein the magnetic detector 52 is arranged between the detection shaft 10 and the magnet 51.

Description

ストロークセンサStroke sensor
　本発明はストロークセンサに関する。 The present invention relates to a stroke sensor.
　磁性体の直線運動を検出する変位センサとして、例えば、特許文献１に開示されたものがある。特許文献１の変位センサは、ボビン外周に巻き線された複数個の分割コイルで構成され、可動体の変位量を電気量に変換して差動的に検出していた。
　また、特許文献２に開示される磁性体の移動方向検出装置は、凹凸状磁性移動体の移動方向に沿ってバイアス磁界を付加する磁石を備えた２個以上の磁気センサを配置していた。 As a displacement sensor for detecting the linear motion of a magnetic material, for example, there is one disclosed in Patent Document 1. The displacement sensor of Patent Document 1 is composed of a plurality of divided coils wound around the bobbin, and converts the displacement amount of the movable body into an electric amount for differential detection.
Further, in the moving direction detecting device for a magnetic material disclosed in Patent Document 2, two or more magnetic sensors provided with a magnet for applying a bias magnetic field along the moving direction of the uneven magnetic moving body are arranged.
特開平５-２６６０２号公報Japanese Unexamined Patent Publication No. 5-26602 特開２００９-１５６５８９号公報Japanese Unexamined Patent Publication No. 2009-156589
　しかしながら、特許文献１、２に開示の構成は、一方向の直線運動を検出するストロークセンサに適用するにはコストが高くなるという問題があった。 However, the configuration disclosed in Patent Documents 1 and 2 has a problem that the cost is high when applied to a stroke sensor that detects linear motion in one direction.
　本発明は、上記問題点に鑑みてなされたものであり、構造を簡素化し低コスト化したストロークセンサを提供することを目的とする。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a stroke sensor having a simplified structure and a low cost.
　上記目的を達成するため、本発明に係るストロークセンサは、
　被検出体に追従して原点位置から移動する検出シャフトの移動量を検出するストロークセンサであって、
　軟磁性材料からなり、径大部を有する前記検出シャフトと、
　一端で前記径大部と接し、前記原点位置から移動した後の前記検出シャフトを前記原点位置に復帰させるスプリングと、
　磁界を発生させる磁石と、
　前記磁界を検出する磁気検出素子と、を備え、
　前記磁気検出素子は、前記径大部と前記磁石の間に配置される、
　ことを特徴とする。 In order to achieve the above object, the stroke sensor according to the present invention is
A stroke sensor that detects the amount of movement of the detection shaft that follows the object to be detected and moves from the origin position.
The detection shaft, which is made of a soft magnetic material and has a large diameter,
A spring that comes into contact with the large diameter portion at one end and returns the detection shaft to the origin position after moving from the origin position.
A magnet that generates a magnetic field and
A magnetic detection element for detecting the magnetic field is provided.
The magnetic detection element is arranged between the large diameter portion and the magnet.
It is characterized by that.
　本発明によれば、構造を簡素化し簡易な方法で検出シャフトの移動を検出するストロークセンサを提供することができる。 According to the present invention, it is possible to provide a stroke sensor that simplifies the structure and detects the movement of the detection shaft by a simple method.
本発明のストロークセンサの第１乃至第３の態様の断面図である。It is sectional drawing of the 1st to 3rd aspect of the stroke sensor of this invention. ストロークセンサの第１の態様の検出シャフトと磁気検出素子の位置関係を示す図である。It is a figure which shows the positional relationship between the detection shaft of the 1st aspect of a stroke sensor, and a magnetic detection element. ストロークセンサの第２の態様の検出シャフトと磁気検出素子の位置関係を示す図である。It is a figure which shows the positional relationship between the detection shaft of the 2nd aspect of a stroke sensor, and a magnetic detection element. ストロークセンサの第３の態様の検出シャフトと磁気検出素子の位置関係を示す図である。It is a figure which shows the positional relationship between the detection shaft of the 3rd aspect of a stroke sensor, and a magnetic detection element.
　以下に、本発明に係るストロークセンサを添付図面に基づいて説明する。 The stroke sensor according to the present invention will be described below with reference to the attached drawings.
　図１を参照する。図１は、ストロークセンサ１の第１乃至第３の態様の断面図を示す。
　ストロークセンサ１は、検出シャフト１０と、第一のハウジング２０と、第二のハウジング３０と、スプリング４０と、磁石５１と、磁気検出素子５２と、を備える。 See FIG. FIG. 1 shows a cross-sectional view of the first to third aspects of the stroke sensor 1.
The stroke sensor 1 includes a detection shaft 10, a first housing 20, a second housing 30, a spring 40, a magnet 51, and a magnetic detection element 52.
　検出シャフト１０は、被検出体の移動によって追従される検出媒体であり、例えば、被検出体に連結されて外力が伝達され、軸方向に往復して追従する。検出シャフト１０は、ある程度剛性を有する軟磁性材料が好ましく、例えばフェライト系ステンレス（ＳＵＳ４３０）からなる。 The detection shaft 10 is a detection medium that is followed by the movement of the detected body. For example, the detection shaft 10 is connected to the detected body, an external force is transmitted, and the detection shaft 10 reciprocates and follows in the axial direction. The detection shaft 10 is preferably made of a soft magnetic material having a certain degree of rigidity, and is made of, for example, ferritic stainless steel (SUS430).
　検出シャフト１０は、円柱状の直径の異なる径大部１１、径中部１２を有し、第一のハウジング２０の方向に径大部１１が構成される。また、検出シャフト１０は、気密部材１５が取り付けられる。検出シャフト１０は、棒状の被加工材を切削して成形されてもよく、鋳造や射出成形によって成形されてもよい。 The detection shaft 10 has a columnar large diameter portion 11 and a middle diameter portion 12 having different diameters, and the large diameter portion 11 is configured in the direction of the first housing 20. Further, the airtight member 15 is attached to the detection shaft 10. The detection shaft 10 may be formed by cutting a rod-shaped workpiece, or may be formed by casting or injection molding.
　径大部１１は、検出シャフト１０において最も直径の大きい円板状の部位であり、スプリング４０の端部４１と接する。
　径大部１１は、その厚さ方向に対して上端１１ａ（第一のハウジング２０の方向）、下端１１ｂ（第二のハウジング３０の方向）、及び上端１１ａと下端１１ｂの中間である中間点１１ｃを有する。 The large diameter portion 11 is a disk-shaped portion having the largest diameter in the detection shaft 10, and is in contact with the end portion 41 of the spring 40.
The large diameter portion 11 has an upper end 11a (direction of the first housing 20), a lower end 11b (direction of the second housing 30), and an intermediate point 11c intermediate between the upper end 11a and the lower end 11b with respect to the thickness direction thereof. Has.
　なお、検出シャフト１０の径大部１１は、窪み１１ｄを備えていてもよい。これにより、ストロークセンサ１は、磁性材料で作られた治具の先端を窪み１１ｄと合わせることで検出シャフト１０の保持を容易にし、さらに検出シャフト１０の径中部１２を後述する第二のハウジング３０のシャフト穴３２に通すことを容易にし、簡易な構成でストロークセンサ１の組み立ての作業性及び精度を向上させることができる。
　また、窪み１１ｄは、スプリング４０の内径よりも小さいことで径大部１１とスプリング４０の端部４１の接触に影響を及ぼさず、検出シャフト１０の移動への影響を防止する。
　なお、窪み１１ｄは、円形、四角、多角形など任意の形状を用いることができる。 The large diameter portion 11 of the detection shaft 10 may be provided with a recess 11d. As a result, the stroke sensor 1 facilitates the holding of the detection shaft 10 by aligning the tip of the jig made of the magnetic material with the recess 11d, and further, the middle diameter portion 12 of the detection shaft 10 is the second housing 30 described later. It is easy to pass through the shaft hole 32 of the stroke sensor 1, and the workability and accuracy of assembling the stroke sensor 1 can be improved with a simple configuration.
Further, since the recess 11d is smaller than the inner diameter of the spring 40, it does not affect the contact between the large diameter portion 11 and the end portion 41 of the spring 40, and prevents the influence on the movement of the detection shaft 10.
The recess 11d may have any shape such as a circle, a square, or a polygon.
　径中部１２は、検出シャフト１０の径大部１１より直径の小さい部位である。径中部１２は、第二のハウジング３０のシャフト穴３２から外側に突き出しており、図示しない被検出体と接続される。 The middle diameter portion 12 is a portion having a smaller diameter than the large diameter portion 11 of the detection shaft 10. The middle diameter portion 12 projects outward from the shaft hole 32 of the second housing 30 and is connected to a detected body (not shown).
　気密部材１５は、ゴムからなるＯリングであり、径中部１２に設けられた溝によって保持される。気密部材１５は、ストロークセンサ１の気密を保つために用いられ、該溝は、気密部材１５の気密機能を発揮するために必要な溝構造を満たすように構成される。 The airtight member 15 is an O-ring made of rubber and is held by a groove provided in the middle diameter portion 12. The airtight member 15 is used to maintain the airtightness of the stroke sensor 1, and the groove is configured to satisfy the groove structure necessary for exerting the airtight function of the airtight member 15.
　第一のハウジング２０は、蓋部２１と、取付部２２と、第一の側壁２４と、第一の受部２５と、第一のネジ部２９と、を有して構成される。 The first housing 20 includes a lid portion 21, a mounting portion 22, a first side wall 24, a first receiving portion 25, and a first screw portion 29.
　第一のハウジング２０は、アルミニウムやステンレス鋼などの非磁性材料が好ましく、蓋部２１と第一の側壁２４によって略円筒状に形成されている。なお、第１の態様における第一のハウジング２０は、スプリング４０との干渉防止及び金型成形時の抜き勾配として、内側にテーパーを設けてもよい。 The first housing 20 is preferably made of a non-magnetic material such as aluminum or stainless steel, and is formed in a substantially cylindrical shape by the lid portion 21 and the first side wall 24. The first housing 20 in the first aspect may be provided with a taper on the inside as a draft for preventing interference with the spring 40 and for forming a mold.
　蓋部２１は、第一のハウジング２０の蓋状の部位である。蓋部２１は、スプリング４０の端部４２と接する。 The lid portion 21 is a lid-shaped portion of the first housing 20. The lid portion 21 is in contact with the end portion 42 of the spring 40.
　取付部２２は、ストロークセンサ１を固定して取り付けるための部位であり、蓋部２１に設けられた溝である。取付部２２は、開口部に雌ねじが形成され、固定対象に形成された雄ねじと連結される。また、取付部２２は、シャフトの圧入や接着剤による接着など、公知の固定方法を適宜用いることができる。 The mounting portion 22 is a portion for fixing and mounting the stroke sensor 1, and is a groove provided in the lid portion 21. A female screw is formed in the opening of the mounting portion 22, and the mounting portion 22 is connected to a male screw formed in the fixing target. Further, for the mounting portion 22, a known fixing method such as press-fitting of a shaft or bonding with an adhesive can be appropriately used.
　第一の側壁２４は、蓋部２１から延長して形成され、第一のハウジング２０の側面を構成する。 The first side wall 24 is formed by extending from the lid portion 21 and constitutes the side surface of the first housing 20.
　第一の受部２５は、第一の側壁２４の蓋部２１とは逆側に形成された面であり、検出シャフト１０の径大部１１を受け、検出シャフト１０の移動量Ｓを制限する。なお、原点位置Ｏにおける径大部１１から第一の受部２５までの長さは、スプリング４０の最大たわみ量より小さくなるように構成される。 The first receiving portion 25 is a surface formed on the side opposite to the lid portion 21 of the first side wall 24, receives the large diameter portion 11 of the detection shaft 10, and limits the movement amount S of the detection shaft 10. .. The length from the large diameter portion 11 to the first receiving portion 25 at the origin position O is configured to be smaller than the maximum amount of deflection of the spring 40.
　第一のネジ部２９は、第一の側壁２４の内側に設けられたネジ山であり、例えば、雄ネジが形成される。第一のネジ部２９は、後述する第二のネジ部３９と嵌め合わせてネジ締めすることで、第一のハウジング２０と第二のハウジング３０を結合する。 The first screw portion 29 is a screw thread provided inside the first side wall 24, and for example, a male screw is formed. The first screw portion 29 is fitted with a second screw portion 39, which will be described later, and screw-tightened to connect the first housing 20 and the second housing 30.
　第二のハウジング３０は、第二の受部３１と、シャフト穴３２と、第二の側壁３４と、第二のネジ部３９と、を有して構成される。 The second housing 30 includes a second receiving portion 31, a shaft hole 32, a second side wall 34, and a second screw portion 39.
　第二のハウジング３０は、アルミニウムやステンレス鋼などの非磁性材料が好ましく、略カップ状に形成されている。 The second housing 30 is preferably made of a non-magnetic material such as aluminum or stainless steel, and is formed in a substantially cup shape.
　第二の受部３１は、第二のハウジング３０の底部に設けられ、検出シャフト１０の径大部１１を受け、検出シャフト１０を原点位置Ｏに保つ。 The second receiving portion 31 is provided at the bottom of the second housing 30, receives the large diameter portion 11 of the detection shaft 10, and keeps the detection shaft 10 at the origin position O.
　シャフト穴３２は、検出シャフト１０の径中部１２を支持し、外部に取り出す。 The shaft hole 32 supports the middle diameter portion 12 of the detection shaft 10 and is taken out to the outside.
　第二の側壁３４は、第二の受部３１から立つように形成され、第二のハウジング３０の側面を構成する。 The second side wall 34 is formed so as to stand from the second receiving portion 31, and constitutes the side surface of the second housing 30.
　第二のネジ部３９は、第二の側壁３４の外側に設けられたネジ山であり、例えば、雄ネジが形成される。なお、第一のネジ部２９と第二のネジ部３９の締め方向は、スプリング４０の巻き方向と同一である。これにより、ストロークセンサ１は、第一のハウジング２０と第二のハウジング３０を結合する際に、スプリング４０を巻き方向とは逆に捩って損傷させることを防止する。 The second screw portion 39 is a screw thread provided on the outside of the second side wall 34, and for example, a male screw is formed. The tightening direction of the first screw portion 29 and the second screw portion 39 is the same as the winding direction of the spring 40. As a result, the stroke sensor 1 prevents the spring 40 from being twisted and damaged in the direction opposite to the winding direction when the first housing 20 and the second housing 30 are connected.
　スプリング４０は、ステンレス鋼線や鉄または鉄合金からなるオイルテンパー線などが好ましく、例えばＳＵＳ３０４ＷＰＢ、ＳＷＯＳＣ-ＢやＳＷＯＳＣ－Ｖなどによる円筒状のコイルばねで構成される。なお、スプリング４０は、防錆や潤滑を目的として、図示しない半固体又は半流動体の潤滑剤（例えば、グリース）が塗布されていてもよい。
　スプリング４０は、一方の端部４１が検出シャフト１０の径大部１１と、別の一方の端部４２が第一のハウジング２０の蓋部２１と、接している。 The spring 40 is preferably a stainless steel wire, an oil tempered wire made of iron or an iron alloy, or the like, and is composed of, for example, a cylindrical coil spring made of SUS304WPB, SWOSC-B, SWOSC-V, or the like. The spring 40 may be coated with a semi-solid or semi-fluid lubricant (for example, grease) (not shown) for the purpose of rust prevention and lubrication.
One end 41 of the spring 40 is in contact with the large diameter portion 11 of the detection shaft 10, and the other end 42 is in contact with the lid portion 21 of the first housing 20.
　原点位置Ｏにある検出シャフト１０が第一のハウジング２０の方向に押し込まれるように移動すると、径大部１１がスプリング４０を押し、且つ、蓋部２１がスプリング４０を支持することで、スプリング４０が押し潰され、検出シャフト１０の径大部１１が第一のハウジング２０の第一の受部２５に当たるまでの移動量Ｓ分だけ移動することができる。
　そして、検出シャフト１０を押し込む力がなくなると、スプリング４０に蓄積されたばね力で第二のハウジング３０の方向に戻されるように移動し、検出シャフト１０の径大部１１が第二の受部３１に当たることで原点位置Ｏに復帰する。 When the detection shaft 10 at the origin position O is moved so as to be pushed in the direction of the first housing 20, the large diameter portion 11 pushes the spring 40, and the lid portion 21 supports the spring 40, whereby the spring 40 Is crushed, and the large diameter portion 11 of the detection shaft 10 can be moved by the amount of movement S until it hits the first receiving portion 25 of the first housing 20.
Then, when the force for pushing the detection shaft 10 disappears, the spring force accumulated in the spring 40 moves so as to return to the direction of the second housing 30, and the large diameter portion 11 of the detection shaft 10 becomes the second receiving portion 31. It returns to the origin position O by hitting.
　磁石５１は、例えば角柱状に形成された希土類系磁石（例えば、ＳｍＣｏやＮｄＦｅＢなどの材料の磁石）からなり、後述する磁気検出素子５２に磁界を提供してする。磁石５１は、製造手法により焼結磁石やプラスチックと混ぜて圧縮もしくは成形されたプラスチック磁石などのいずれでもよい。焼結磁石の方が強力な磁力を有する一方、プラスチック磁石の方が大量生産性や耐割れ性が高いなど特性があることから、使用条件や設計要件に応じて適宜選択すればよい。 The magnet 51 is made of, for example, a rare earth magnet formed in a prismatic shape (for example, a magnet made of a material such as SmCo or NdFeB), and provides a magnetic field to a magnetic detection element 52 described later. The magnet 51 may be a sintered magnet, a plastic magnet mixed with plastic and compressed or molded by a manufacturing method, or the like. While sintered magnets have stronger magnetic force, plastic magnets have characteristics such as higher mass productivity and crack resistance, so they may be appropriately selected according to usage conditions and design requirements.
　磁気検出素子５２は、被検出体の位置や移動量などの変化を磁界の向き及び強さにより検出するためのものであり、例えば、ホール素子などで構成される。磁気検出素子５２は、検出シャフト１０と磁石５１との間に配置され、磁石５１と磁気検出素子５２の距離は、できるだけ小さくなる様に配置される。
　磁気検出素子５２は、軟磁性体である検出シャフト１０が移動することで、磁石５１が磁気検出素子５２へ与える磁界の向き及び強さを変え、その結果を移動量Ｓとして検出する。これにより、ストロークセンサ１は、構造を簡素化し簡易な方法で検出シャフトの移動を検出することができる。 The magnetic detection element 52 is for detecting changes in the position and movement amount of the object to be detected by the direction and strength of the magnetic field, and is composed of, for example, a Hall element or the like. The magnetic detection element 52 is arranged between the detection shaft 10 and the magnet 51, and the distance between the magnet 51 and the magnetic detection element 52 is arranged so as to be as small as possible.
The magnetic detection element 52 changes the direction and strength of the magnetic field applied to the magnetic detection element 52 by the magnet 51 by moving the detection shaft 10 which is a soft magnetic material, and detects the result as the movement amount S. As a result, the stroke sensor 1 can simplify the structure and detect the movement of the detection shaft by a simple method.
　基板５３は、ガラスエポキシなどからなるプリント基板（Printed Circuit Board; PCB）であり、磁石５１及び磁気検出素子５２を備える。基板５３の磁気検出素子５２への電源の取り込みや外部への電気信号の出力は、基板５３に接続される図示しない電気コードにて行われる。なお、基板５３の磁気検出素子５２への電源の取り込みや外部への電気信号の出力は、電気コードの代わりにダイレクトコネクタやカプラーなどを用いてもよい。 The substrate 53 is a printed circuit board (Printed Circuit Board; PCB) made of glass epoxy or the like, and includes a magnet 51 and a magnetic detection element 52. Taking in the power supply to the magnetic detection element 52 of the substrate 53 and outputting the electric signal to the outside are performed by an electric cord (not shown) connected to the substrate 53. A direct connector, a coupler, or the like may be used instead of the electric cord for taking in the power supply to the magnetic detection element 52 of the substrate 53 and outputting the electric signal to the outside.
　基板収納部５０は、第二のハウジング３０と一体に設けられる。なお、基板収納部５０は、インサート成形により第二のハウジング３０と一体化してもよく、別体として作ったものを接着剤により接合してもよい。基板収納部５０は、磁石５１、磁気検出素子５２、及び基板５３を収納する。 The board storage portion 50 is provided integrally with the second housing 30. The substrate accommodating portion 50 may be integrated with the second housing 30 by insert molding, or may be joined as a separate body with an adhesive. The board storage unit 50 houses the magnet 51, the magnetic detection element 52, and the board 53.
　封止部材６０は、例えばエポキシ樹脂などが用いられる。封止部材６０は、基板収納部５０に注入され硬化することで、磁石５１、磁気検出素子５２、及び基板５３を気密に封止する。 For the sealing member 60, for example, an epoxy resin or the like is used. The sealing member 60 is injected into the substrate accommodating portion 50 and cured to hermetically seal the magnet 51, the magnetic detection element 52, and the substrate 53.
　図２を参照する。図２は、ストロークセンサ１の第１の態様の検出シャフト１０と磁気検出素子５２の位置関係を示す図である。なお、径大部１１及び磁気検出素子５２については、分かりやすくするため大きさを強調して描画し、他の要素については描画を省略している。 Refer to FIG. FIG. 2 is a diagram showing the positional relationship between the detection shaft 10 and the magnetic detection element 52 of the first aspect of the stroke sensor 1. The large diameter portion 11 and the magnetic detection element 52 are drawn with the size emphasized for the sake of clarity, and the other elements are not drawn.
　ストロークセンサ１の第１の態様において、磁気検出素子５２は、原点位置Ｏにおける検出シャフト１０の径大部１１の中間点１１ｃより高く、上端１１ａ以下に配置される。これにより、ストロークセンサ１は、検出シャフト１０が移動し中間点１１ｃが接近するにつれて磁気検出素子５２の出力が増大する。これにより、ストロークセンサ１は、構造を簡素化し簡易な方法で検出シャフト１０の移動を検出することができる。
　なお、第１の態様における磁気検出素子５２の位置は、磁気検出素子５２の中心位置５２ｃであり、磁気検出素子５２の一部が上端１１ａを超えていてもよい。
　また、ストロークセンサ１は、検出シャフト１０が原点位置Ｏにある場合に、中間点１１ｃから磁気検出素子５２の中心位置５２ｃからまでの距離は、上端１１ａから第一の受部２５までの距離よりも短いことが好ましい。これにより、ストロークセンサ１は、中間点１１ｃと中心位置５２ｃが一致し、磁気検出素子５２の出力が最大となる点を確実に検出することがでる。 In the first aspect of the stroke sensor 1, the magnetic detection element 52 is arranged higher than the midpoint 11c of the large diameter portion 11 of the detection shaft 10 at the origin position O and below the upper end 11a. As a result, in the stroke sensor 1, the output of the magnetic detection element 52 increases as the detection shaft 10 moves and the intermediate point 11c approaches. As a result, the stroke sensor 1 can detect the movement of the detection shaft 10 by a simple method with a simplified structure.
The position of the magnetic detection element 52 in the first aspect is the center position 52c of the magnetic detection element 52, and a part of the magnetic detection element 52 may exceed the upper end 11a.
Further, in the stroke sensor 1, when the detection shaft 10 is at the origin position O, the distance from the intermediate point 11c to the center position 52c of the magnetic detection element 52 is from the distance from the upper end 11a to the first receiving portion 25. Is also preferred to be short. As a result, the stroke sensor 1 can reliably detect the point where the intermediate point 11c and the center position 52c coincide with each other and the output of the magnetic detection element 52 becomes maximum.
　図３を参照する。図３は、ストロークセンサ１の第２の態様の検出シャフト１０と磁気検出素子５２の位置関係を示す。なお、径大部１１及び磁気検出素子５２については、分かりやすくするため大きさを強調して描画し、他の要素については描画を省略している。 Refer to FIG. FIG. 3 shows the positional relationship between the detection shaft 10 and the magnetic detection element 52 of the second aspect of the stroke sensor 1. The large diameter portion 11 and the magnetic detection element 52 are drawn with the size emphasized for the sake of clarity, and the other elements are not drawn.
　ストロークセンサ１の第２の態様において、磁気検出素子５２は、原点位置Ｏにおける検出シャフト１０の径大部１１の中間点１１ｃ以下、下端１１ｂより上に配置される。これにより、ストロークセンサ１は、原点位置Ｏにおいて磁気検出素子５２の出力が最も大きく、検出シャフト１０が移動し中間点１１ｃが離隔するにしたがって磁気検出素子５２の出力が低下する。これにより、ストロークセンサ１は、構造を簡素化し簡易な方法で検出シャフト１０の移動を検出することができる。また、ストロークセンサ１は、第１の態様よりも磁気検出素子５２と上端１１ａの距離が離れるため、スプリング４０が磁石５１と径大部１１が形成する磁界へ及ぼす影響をより小さくすることができる。
　なお、第２の態様における磁気検出素子５２の位置は、磁気検出素子５２の中心位置５２ｃであり、磁気検出素子５２の一部が中間点１１ｃを超えていてもよい。 In the second aspect of the stroke sensor 1, the magnetic detection element 52 is arranged below the midpoint 11c of the large diameter portion 11 of the detection shaft 10 at the origin position O and above the lower end 11b. As a result, in the stroke sensor 1, the output of the magnetic detection element 52 is the largest at the origin position O, and the output of the magnetic detection element 52 decreases as the detection shaft 10 moves and the intermediate point 11c separates. As a result, the stroke sensor 1 can detect the movement of the detection shaft 10 by a simple method with a simplified structure. Further, in the stroke sensor 1, since the distance between the magnetic detection element 52 and the upper end 11a is larger than in the first aspect, the influence of the spring 40 on the magnetic field formed by the magnet 51 and the large diameter portion 11 can be further reduced. ..
The position of the magnetic detection element 52 in the second aspect is the center position 52c of the magnetic detection element 52, and a part of the magnetic detection element 52 may exceed the intermediate point 11c.
　図４を参照する。図４は、ストロークセンサ１の第３の態様の検出シャフト１０と磁気検出素子５２の位置関係を示す。なお、径大部１１及び検出素子５２については、分かりやすくするため大きさを強調して描画し、他の要素については描画を省略している。 Refer to FIG. FIG. 4 shows the positional relationship between the detection shaft 10 and the magnetic detection element 52 of the third aspect of the stroke sensor 1. The large diameter portion 11 and the detection element 52 are drawn with the size emphasized for the sake of clarity, and the other elements are not drawn.
　ストロークセンサ１の第２の態様において、磁気検出素子５２は、検出シャフト１０の径大部１１の下端１１ｂ以下に配置される。これにより、ストロークセンサ１は、原点位置Ｏにおいて磁気検出素子５２の出力が最も大きく、検出シャフト１０が移動し下端１１ｂが離隔するにしたがって磁気検出素子５２の出力が低下する。これにより、ストロークセンサ１は、構造を簡素化し低コストで検出シャフト１０の移動を検出することができる。また、ストロークセンサ１は、第１及び第２の態様よりも磁気検出素子５２と上端１１ａの距離が離れるため、スプリング４０が磁石５１と径大部１１が形成する磁界へ及ぼす影響をより小さくすることができる。
　なお、第３の態様における磁気検出素子５２の位置は、磁気検出素子５２の中心位置５２ｃであり、磁気検出素子５２の一部が下端１１ｂを超えていてもよい。 In the second aspect of the stroke sensor 1, the magnetic detection element 52 is arranged below the lower end 11b of the large diameter portion 11 of the detection shaft 10. As a result, in the stroke sensor 1, the output of the magnetic detection element 52 is the largest at the origin position O, and the output of the magnetic detection element 52 decreases as the detection shaft 10 moves and the lower end 11b separates. As a result, the stroke sensor 1 can simplify the structure and detect the movement of the detection shaft 10 at low cost. Further, in the stroke sensor 1, since the distance between the magnetic detection element 52 and the upper end 11a is larger than in the first and second aspects, the influence of the spring 40 on the magnetic field formed by the magnet 51 and the large diameter portion 11 is further reduced. be able to.
The position of the magnetic detection element 52 in the third aspect is the center position 52c of the magnetic detection element 52, and a part of the magnetic detection element 52 may exceed the lower end 11b.
　以上に説明した態様は、以下の効果を奏する。 The embodiments described above have the following effects.
　被検出体に追従して原点位置Ｏから移動する検出シャフト１０の移動量Ｓを検出するストロークセンサ１であって、
　軟磁性材料からなり、径大部１１を有する検出シャフト１０と、
　一方の端部４１で径大部１１と接し、原点位置Ｏから移動した後の検出シャフト１０を原点位置Ｏに復帰させるスプリング４０と、
　磁界を発生させる磁石５１と、
　前記磁界を検出する磁気検出素子５２と、を備え、
　磁気検出素子５２は、検出シャフト１０と磁石５１の間に配置される。 A stroke sensor 1 that detects the amount of movement S of the detection shaft 10 that follows the object to be detected and moves from the origin position O.
A detection shaft 10 made of a soft magnetic material and having a large diameter portion 11 and
A spring 40 that comes into contact with the large diameter portion 11 at one end 41 and returns the detection shaft 10 after moving from the origin position O to the origin position O.
A magnet 51 that generates a magnetic field and
A magnetic detection element 52 for detecting the magnetic field is provided.
The magnetic detection element 52 is arranged between the detection shaft 10 and the magnet 51.
　ストロークセンサ１は、検出シャフト１０と磁石５１が発生させる磁界の変化を検出することで、構造を簡素化し簡易な方法で検出シャフト１０の移動を検出することができる。 The stroke sensor 1 can detect the movement of the detection shaft 10 by a simple method by simplifying the structure by detecting the change in the magnetic field generated by the detection shaft 10 and the magnet 51.
　ストロークセンサ１において、
　径大部１１は、スプリング４０の方向に上端１１ａと、上端１１ａの反対側に下端１１ｂと、上端１１ａと下端１１ｂの中間に中間点１１ｃと、下端１１ｂから連続する径中部１２と、を有し、
　磁気検出素子５２は、上端１１ａよりも径中部１２の方向に位置する。 In the stroke sensor 1,
The large diameter portion 11 has an upper end 11a in the direction of the spring 40, a lower end 11b on the opposite side of the upper end 11a, an intermediate point 11c between the upper end 11a and the lower end 11b, and a middle diameter portion 12 continuous from the lower end 11b. death,
The magnetic detection element 52 is located in the direction of the middle diameter portion 12 with respect to the upper end 11a.
　ストロークセンサ１は、径大部１１の移動を検出することで、構造を簡素化し簡易な方法で検出シャフト１０の移動を検出することができる。 The stroke sensor 1 can detect the movement of the detection shaft 10 by a simple method by simplifying the structure by detecting the movement of the large diameter portion 11.
　ストロークセンサ１において、
　磁気検出素子５２は、上端１１ａ以下、且つ中間点１１ｃよりも上端１１ａの方向に位置する。 In the stroke sensor 1,
The magnetic detection element 52 is located below the upper end 11a and in the direction of the upper end 11a from the intermediate point 11c.
　ストロークセンサ１は、中間点１１ｃの接近による出力の増大により、構造を簡素化し簡易な方法で検出シャフト１０の移動を検出することができる。 The stroke sensor 1 can detect the movement of the detection shaft 10 by a simple method by simplifying the structure by increasing the output due to the approach of the intermediate point 11c.
　ストロークセンサ１において、
　磁気検出素子５２は、中間点１１ｃ以下、且つ下端１１ｂよりも上端１１ａの方向に位置する。 In the stroke sensor 1,
The magnetic detection element 52 is located below the intermediate point 11c and in the direction of the upper end 11a with respect to the lower end 11b.
　ストロークセンサ１は、中間点１１ｃの離隔による出力の低下により、構造を簡素化し簡易な方法で検出シャフト１０の移動を検出することができ、またスプリング４０が磁石５１と径大部１１が形成する磁界へ及ぼす影響をより小さくすることができる。 The stroke sensor 1 can detect the movement of the detection shaft 10 by a simple method by simplifying the structure by reducing the output due to the separation of the intermediate point 11c, and the spring 40 is formed by the magnet 51 and the large diameter portion 11. The effect on the magnetic field can be made smaller.
　ストロークセンサ１において、
　磁気検出素子５２は、下端１１ｂよりも径中部１２の方向に位置する。 In the stroke sensor 1,
The magnetic detection element 52 is located in the direction of the middle diameter portion 12 with respect to the lower end 11b.
　ストロークセンサ１は、下端１１ｂの離隔による出力の低下により、構造を簡素化し簡易な方法で検出シャフト１０の移動を検出することができ、またスプリング４０が磁石５１と径大部１１が形成する磁界へ及ぼす影響をより小さくすることができる。 The stroke sensor 1 can detect the movement of the detection shaft 10 by a simple method by simplifying the structure by reducing the output due to the separation of the lower end 11b, and the spring 40 is a magnetic field formed by the magnet 51 and the large diameter portion 11. The effect on can be made smaller.
　ストロークセンサ１において、
　スプリング４０の別の端部４２と接する第一のハウジング２０と、
　検出シャフト１０を外部に取り出す第二のハウジング３０と、をさらに備え、
　第一のハウジング２０と第二のハウジング３０にはネジ部２９、３９が形成され、
　第一のハウジング２０と第二のハウジング３０は、ネジ締めにより結合され、その締め方向は、スプリング４０の巻き方向と同一である。 In the stroke sensor 1,
A first housing 20 in contact with another end 42 of the spring 40,
A second housing 30 for taking out the detection shaft 10 to the outside is further provided.
Screw portions 29 and 39 are formed in the first housing 20 and the second housing 30.
The first housing 20 and the second housing 30 are connected by screw tightening, and the tightening direction thereof is the same as the winding direction of the spring 40.
　ストロークセンサ１は、スプリング４０の第一のハウジング２０と第二のハウジング３０を結合する際の損傷を防止し、構造を簡素化し簡易な方法で検出シャフト１０の移動を検出することができる。 The stroke sensor 1 can prevent damage when connecting the first housing 20 and the second housing 30 of the spring 40, simplify the structure, and detect the movement of the detection shaft 10 by a simple method.
　ストロークセンサ１において、
　検出シャフト１０は、径大部１１にスプリング４０の内径よりも小さい窪み１１ｄを有する。 In the stroke sensor 1,
The detection shaft 10 has a recess 11d in the large diameter portion 11 which is smaller than the inner diameter of the spring 40.
　ストロークセンサ１は、窪み１１ｄにより検出シャフト１０の組み立て時の保持を容易にし、簡易な構成で組み立ての作業性及び精度を向上させることができる。 The stroke sensor 1 has a recess 11d that facilitates holding of the detection shaft 10 during assembly, and can improve the workability and accuracy of assembly with a simple configuration.
　本発明は、上述の態様及び図面によって限定されるものではない。本発明の要旨を変更しない範囲で、適宜、変更（構成要素の削除も含む）を加えることが可能である。 The present invention is not limited to the above aspects and drawings. Changes (including deletion of components) can be made as appropriate without changing the gist of the present invention.
１　　　ストロークセンサ
１０　　検出シャフト
１１　　径大部
１１ａ　上端
１１ｂ　下端
１１ｃ　中間点
１１ｄ　窪み
１２　　径中部
１５　　気密部材
２０　　第一のハウジング
２１　　蓋部
２４　　第一の側壁
２５　　第一の受部
２９　　第一のネジ部
３０　　第二のハウジング
３１　　第二の受部
３２　　シャフト穴
３４　　第二の側壁
３９　　第二のネジ部
４０　　スプリング
５０　　基板収納部
５１　　磁石
５２　　磁気検出素子
５２ｃ　中心位置
６０　　封止部材
Ｏ　　　原点位置
Ｓ　　　移動量 1 Stroke sensor 10 Detection shaft 11 Large diameter 11a Upper end 11b Lower end 11c Midpoint 11d Recess 12 Diameter Middle 15 Airtight member 20 First housing 21 Lid 24 First side wall 25 First receiving part 29 First threaded part 30 Second housing 31 Second receiving part 32 Shaft hole 34 Second side wall 39 Second screw part 40 Spring 50 Board housing part 51 Magnet 52 Magnetic detection element 52c Center position 60 Sealing member O Origin position S Movement amount

Claims (7)

  1. 　被検出体に追従して原点位置から移動する検出シャフトの移動量を検出するストロークセンサであって、
    　軟磁性材料からなり、径大部を有する前記検出シャフトと、
    　一方の端部が前記径大部と接し、前記原点位置から移動した後の前記検出シャフトを前記原点位置に復帰させるスプリングと、
    　磁界を発生させる磁石と、
    　前記磁界を検出する磁気検出素子と、を備え、
    　前記磁気検出素子は、前記検出シャフトと前記磁石の間に配置される、
    ストロークセンサ。     A stroke sensor that detects the amount of movement of the detection shaft that follows the object to be detected and moves from the origin position.
    The detection shaft, which is made of a soft magnetic material and has a large diameter,
    A spring in which one end is in contact with the large diameter portion and the detection shaft is returned to the origin position after moving from the origin position.
    A magnet that generates a magnetic field and
    A magnetic detection element for detecting the magnetic field is provided.
    The magnetic detection element is arranged between the detection shaft and the magnet.
    Stroke sensor.
  2. 　前記径大部は、前記スプリングの方向に上端と、前記上端の反対側に下端と、前記上端と前記下端の中間に中間点と、前記下端から連続する径中部と、を有し、
    　前記磁気検出素子は、前記上端よりも径中部の方向に位置する、
    請求項１に記載のストロークセンサ。     The large diameter portion has an upper end in the direction of the spring, a lower end on the opposite side of the upper end, an intermediate point between the upper end and the lower end, and a middle diameter portion continuous from the lower end.
    The magnetic detection element is located in the middle diameter direction from the upper end.
    The stroke sensor according to claim 1.
  3. 　前記磁気検出素子は、前記上端以下、且つ前記中間点よりも前記上端の方向に位置する、
    請求項２に記載のストロークセンサ。     The magnetic detection element is located below the upper end and in the direction of the upper end from the intermediate point.
    The stroke sensor according to claim 2.
  4. 　前記磁気検出素子は、前記中間点以下、且つ前記下端よりも前記上端の方向に位置する、
    請求項２に記載のストロークセンサ。     The magnetic detection element is located below the midpoint and in the direction of the upper end from the lower end.
    The stroke sensor according to claim 2.
  5. 　前記磁気検出素子は、前記下端よりも前記径中部の方向に位置する、
    請求項２に記載のストロークセンサ。     The magnetic detection element is located in the direction of the middle part of the diameter from the lower end.
    The stroke sensor according to claim 2.
  6. 　前記スプリングの別の端部と接する第一のハウジングと、
    　前記検出シャフトを外部に取り出す第二のハウジングと、をさらに備え、
    　前記第一のハウジングと前記第二のハウジングにはネジ山が形成され、
    　前記第一のハウジングと前記第二のハウジングは、ネジ締めにより結合され、その締め方向は、前記スプリングの巻き方向と同一である、
    請求項１から５のいずれか１つに記載のストロークセンサ。     A first housing that contacts another end of the spring,
    Further equipped with a second housing for taking out the detection shaft to the outside,
    Threads are formed in the first housing and the second housing.
    The first housing and the second housing are connected by screw tightening, and the tightening direction thereof is the same as the winding direction of the spring.
    The stroke sensor according to any one of claims 1 to 5.
  7. 　前記検出シャフトは、前記径大部に前記スプリングの内径よりも小さい窪みを有する、
    請求項１から６のいずれか１つに記載のストロークセンサ。     The detection shaft has a recess in the large diameter portion smaller than the inner diameter of the spring.
    The stroke sensor according to any one of claims 1 to 6.
PCT/JP2021/020327 2020-05-29 2021-05-28 Stroke sensor WO2021241717A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030197502A1 (en) * 1996-03-22 2003-10-23 David S. Nyce Magnetostrictive linear displacement transducer for a vehicle strut suspension
WO2016031261A1 (en) * 2014-08-26 2016-03-03 Tdk株式会社 Magnetic position detection device
JP2019086504A (en) * 2017-11-07 2019-06-06 日本精機株式会社 Stroke sensor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030197502A1 (en) * 1996-03-22 2003-10-23 David S. Nyce Magnetostrictive linear displacement transducer for a vehicle strut suspension
WO2016031261A1 (en) * 2014-08-26 2016-03-03 Tdk株式会社 Magnetic position detection device
JP2019086504A (en) * 2017-11-07 2019-06-06 日本精機株式会社 Stroke sensor

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