WO2015016104A1 - 流体圧シリンダ - Google Patents

流体圧シリンダ Download PDF

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Publication number
WO2015016104A1
WO2015016104A1 PCT/JP2014/069363 JP2014069363W WO2015016104A1 WO 2015016104 A1 WO2015016104 A1 WO 2015016104A1 JP 2014069363 W JP2014069363 W JP 2014069363W WO 2015016104 A1 WO2015016104 A1 WO 2015016104A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensor
hole
fluid pressure
cylinder tube
pressure cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2014/069363
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
小林　俊雄
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KYB Corp
Original Assignee
Kayaba Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kayaba Industry Co Ltd filed Critical Kayaba Industry Co Ltd
Priority to US14/905,296 priority Critical patent/US9879703B2/en
Priority to KR1020167001461A priority patent/KR20160037165A/ko
Priority to CN201480041752.0A priority patent/CN105492781A/zh
Publication of WO2015016104A1 publication Critical patent/WO2015016104A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2861—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2892—Means for indicating the position, e.g. end of stroke characterised by the attachment means

Definitions

  • the present invention relates to a fluid pressure cylinder.
  • the fluid pressure cylinder is a cylindrical cylinder tube, a piston slidably fitted in the cylinder tube, a piston rod connected to the piston, and fitted to the opening end of the cylinder tube to slide the piston rod. And a cylinder head that freely supports the shaft.
  • the fluid pressure cylinder further includes a lower clevis connected to the bottom of the cylinder tube and an upper clevis connected to the end of the piston rod opposite to the piston.
  • the fluid pressure cylinder is connected to the equipment via a lower clevis and an upper clevis.
  • JP 2007-71363A describes a fluid pressure cylinder incorporating a magnetostrictive displacement sensor for detecting relative displacement between a piston rod and a cylinder tube.
  • the magnetostrictive displacement sensor includes a sensor main body, a sensor rod extending from the sensor main body, and an annular magnet disposed on the outer periphery of the sensor rod.
  • the sensor body is placed outside the bottom of the cylinder tube.
  • One end of the sensor rod is inserted into a hollow portion formed in the piston rod, and the other end is connected to the sensor body through a hole provided in the bottom portion of the cylinder tube.
  • the magnet is annularly arranged in the hollow portion of the piston rod so as to face the outer periphery of the sensor rod.
  • An object of the present invention is to improve the mountability of a fluid pressure cylinder incorporating a displacement sensor.
  • a bottomed cylindrical cylinder tube a piston rod that is inserted into the cylinder tube and has a piston in sliding contact with the cylinder tube, and a relative displacement between the piston rod and the cylinder tube
  • a displacement sensor for detecting a cylinder wherein the bottom of the cylinder tube has a pin hole formed in a direction perpendicular to the central axis of the cylinder tube and a pin hole formed in the axial direction of the cylinder tube
  • the displacement sensor is inserted into the axial hole formed in the axial direction of the piston rod from the sensor body.
  • the through hole has a reduced diameter portion whose inner diameter is smaller than that of the other portion, and a female screw portion that is disposed outside the reduced diameter portion and has a female screw formed on the inner periphery thereof. Is provided with a fluid pressure cylinder that is pressed by a plug screwed to the female screw portion and is locked and fixed to the reduced diameter portion.
  • FIG. 1 is a cross-sectional view showing a fluid pressure cylinder according to an embodiment of the present invention.
  • FIG. 1 is a cross-sectional view showing a fluid pressure cylinder 100 in the present embodiment.
  • the fluid pressure cylinder 100 includes a bottomed cylindrical cylinder tube 1, a piston 2 slidably fitted into the cylinder tube 1, and a piston rod to which the piston 2 is coupled to the distal end on the insertion side of the cylinder tube 1. 3, a cylinder head 4 that is fitted to the open end of the cylinder tube 1 and pivotally supports the piston rod 3, and a displacement sensor 5 that detects relative displacement between the piston rod 3 and the cylinder tube 1.
  • the cylinder tube 1 includes a hollow tube 11 that defines a fluid chamber therein, and a bottom portion 12 provided at the bottom of the tube 11.
  • the fluid chamber is partitioned by the piston 2 into a piston side chamber R1 on the bottom portion 12 side and a rod side chamber R2 on the cylinder head 4 side.
  • the piston side chamber R1 communicates with a supply / discharge port 13 formed in the bottom portion 12, and the rod side chamber R2 communicates with a supply / discharge port 41 formed in the cylinder head 4.
  • the pin portion 14 is formed in the bottom portion 12 of the cylinder tube 1 so as to penetrate in a direction perpendicular to the central axis of the cylinder tube 1.
  • a pin hole 42 is formed at the end of the piston rod 3 opposite to the piston 2 so as to penetrate in a direction perpendicular to the central axis of the piston rod 3.
  • a through hole 15 is formed in the bottom portion 12 of the cylinder tube 1 so as to penetrate the bottom portion 12 in the axial direction from the outside to the inside via the pin hole 14. That is, the through hole 15 is formed so as to penetrate from the right end of FIG. 1 to the piston side chamber R1, and is orthogonal to the pin hole 14 in the middle.
  • the inner diameter of the through hole 15 is set to be smaller than the inner diameter of the pin hole 14.
  • the through-hole 15 includes, in order from the piston-side chamber R1 side, a reduced diameter portion 16 whose inner diameter is smaller than that of the other portion, a sensor holding portion 17 that holds a sensor main body 51 described later, and a female in which a female screw is formed on the inner periphery. It has the screw part 18 and the outer side female screw part 19 which is arrange
  • the bottom portion 12 of the cylinder tube 1 is further formed with a wiring extraction hole 20 having one end opened to the sensor holding portion 17 and the other end opened to the side surface of the bottom portion 12.
  • the piston 2 is a cylindrical member having a female screw formed on the inner periphery, and is fixed by being screwed from the front end side of the piston rod 3 to a male screw formed on the outer periphery of the piston rod 3 on the insertion side.
  • the piston rod 3 is formed with a shaft hole 31 formed in the axial direction of the piston rod 3 from the tip surface. The depth from the front end surface of the shaft hole 31 is set longer than the stroke length of the piston rod 3.
  • An enlarged diameter portion 32 having an inner diameter larger than the shaft hole 31 is formed in the opening of the shaft hole 31.
  • the displacement sensor 5 includes a sensor main body 51, a sensor rod 52 extending from the sensor main body 51, and an annular magnet 53 disposed on the outer periphery of the sensor rod 52.
  • the sensor body 51 is disposed in the sensor holding portion 17 in the through hole 15 and abuts on the reduced diameter portion 16 in the axial direction.
  • the wiring 54 extending from the rear of the sensor body 51 is drawn out through the wiring extraction hole 20 of the bottom portion 12.
  • the sensor rod 52 passes through the through hole 15 and is inserted into the shaft hole 31 of the piston rod 3.
  • the outer diameter of the sensor rod 52 is set smaller than the inner diameter of the shaft hole 31, and the sensor rod 52 and the piston rod 3 can be relatively displaced.
  • the magnet 53 is provided in the enlarged diameter portion 32 of the piston rod 3 and is sandwiched between two annular spacers 55.
  • the magnet 53 and the two spacers 55 are fitted into the enlarged diameter portion 32 and are fixed in the enlarged diameter portion 32 by a snap ring 56.
  • the inner diameter of the magnet 53 is set larger than the outer diameter of the sensor rod 52, and wear of the magnet 53 is prevented when the sensor rod 52 and the piston rod 3 are relatively displaced.
  • the displacement sensor 5 sends an excitation pulse from the sensor body 51 to the magnetostrictive wire in the sensor rod 52.
  • a mechanical distortion pulse is generated.
  • the displacement sensor 5 calculates the distance between the sensor main body 51 and the magnet 53 based on the time from when the excitation pulse is sent until the distortion pulse returns. Thereby, the displacement sensor 5 detects the relative position between the piston rod 3 and the cylinder tube 1, that is, the stroke amount of the fluid pressure cylinder 100.
  • a cylindrical collar 6 is provided outside the sensor main body 51 in the sensor holding portion 17 in the through hole 15.
  • the collar 6 has a hole (not shown) through which the wiring is inserted at a position corresponding to the wiring extraction hole 20.
  • a plug 7 having a male screw formed on the outer periphery is screwed to the female screw portion 18 of the through hole 15.
  • the plug 7 is substantially cylindrical and has a hexagon hole (not shown) for tightening the plug on the outer surface in the axial direction.
  • the sensor main body 51 is pressed through the collar 6 when the plug 7 is tightened from the outside in the axial direction, and is locked and fixed by the reduced diameter portion 16.
  • the shape of the hole for tightening the plug 7 is not limited to the hexagon, and may be other shapes.
  • An outer plug 8 is provided outside the pin hole 14 of the through hole 15.
  • the outer plug 8 has a screw part 81 in which a male screw is formed on the outer periphery, and a large-diameter part 82 having a larger diameter than the screw part 81.
  • the plug 7 is positioned on the inner side in the axial direction from the pin hole 14 while being fastened to the female screw portion 18.
  • the tip of the screw portion 81 is positioned on the outer side in the axial direction from the pin hole 14 in a state where the outer plug 8 is fastened to the outer female screw portion 19. This prevents the plug 7 and the outer plug 8 from interfering with the pin inserted through the pin hole 14 when the fluid pressure cylinder 100 is mounted on the device.
  • the fluid pressure cylinder 100 is configured as described above, and expands and contracts by supplying and discharging the working fluid to and from the fluid chamber.
  • the sensor rod 52 and the piston rod 3 are relatively displaced accordingly. Thereby, since the axial distance between the magnet 53 and the sensor body 51 changes, the relative position between the piston rod 3 and the cylinder tube 1 is detected, and the stroke amount of the fluid pressure cylinder 100 is detected.
  • the sensor main body 51 is disposed in the through-hole 15 formed in the bottom portion 12, pressed by the plug 7 screwed to the female screw portion 18, locked to the reduced diameter portion 16, and fixed. Therefore, it is possible to improve the mountability of the fluid pressure cylinder 100 by suppressing the attachment length of the fluid pressure cylinder 100 from being increased while the sensor body 51 is built in the cylinder tube 1.
  • the sensor main body 51 and the sensor rod 52 can be inserted from the outside of the through hole 15, the sensor main body 51 and the sensor rod 52 can be simply removed by removing the outer plug 8 and the plug 7 without disassembling the fluid pressure cylinder 100. Can be removed. Therefore, the inspection and replacement of the sensor main body 51 and the sensor rod 52 can be performed more easily.
  • the sensor main body 51 is pressed and fixed to the reduced diameter portion 16 by the plug 7, it is possible to prevent the sensor main body 51 from moving in the axial direction when receiving pressure from the fluid chamber.
  • the tensile strength of the fluid pressure cylinder 100 can be improved as compared with the case where the sensor body 51 is disposed outside the bottom portion 12 and accommodated in a bracket provided with a clevis.
  • the tightening force of the plug 7 acts only on the outer peripheral portion of the sensor main body 51 via the collar 6, the sensor main body 51 is securely fixed to the bottom portion 12 without increasing the strength of the central portion of the sensor main body 51. Can do.
  • the sensor body 51 can be pressed and fixed by rotating the plug 7 in a state in which the circumferential position between the hole through which the wiring 54 provided in the collar 6 is inserted and the wiring extraction hole 20 is maintained.
  • the outer plug 8 since the outer plug 8 is screwed outside the pin hole 14 of the through hole 15, the outer side of the pin hole 14 of the through hole 15 may be closed except when the plug 7 is accessed by a tool. it can. Therefore, the rigidity of the entire bottom portion 12 can be improved.
  • the sensor body 51 is pressed against the reduced diameter portion 16 via the collar 6 by tightening the plug 7 into the female screw portion 18.
  • An O-ring may be interposed in the contact portion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
PCT/JP2014/069363 2013-07-31 2014-07-22 流体圧シリンダ Ceased WO2015016104A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US14/905,296 US9879703B2 (en) 2013-07-31 2014-07-22 Fluid pressure cylinder
KR1020167001461A KR20160037165A (ko) 2013-07-31 2014-07-22 유체압 실린더
CN201480041752.0A CN105492781A (zh) 2013-07-31 2014-07-22 流体压缸

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013-158827 2013-07-31
JP2013158827A JP5865876B2 (ja) 2013-07-31 2013-07-31 流体圧シリンダ

Publications (1)

Publication Number Publication Date
WO2015016104A1 true WO2015016104A1 (ja) 2015-02-05

Family

ID=52431640

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2014/069363 Ceased WO2015016104A1 (ja) 2013-07-31 2014-07-22 流体圧シリンダ

Country Status (5)

Country Link
US (1) US9879703B2 (enExample)
JP (1) JP5865876B2 (enExample)
KR (1) KR20160037165A (enExample)
CN (1) CN105492781A (enExample)
WO (1) WO2015016104A1 (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104832495A (zh) * 2015-03-31 2015-08-12 徐州重型机械有限公司 悬挂油缸以及起重机
CN104895863A (zh) * 2015-05-18 2015-09-09 合肥长源液压股份有限公司 带有一体式缸底的伺服液压缸
CN112460100A (zh) * 2020-11-26 2021-03-09 燕山大学 一种推压-拉拔液压缸、液压系统及其工作方法

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2520320A (en) * 2013-11-18 2015-05-20 Skf Ab Friction strain gauge sensor
WO2017023303A1 (en) 2015-08-05 2017-02-09 Stren Microlift Technology, Llc Hydraulic pumping system for use with a subterranean well
US20170146006A1 (en) * 2015-11-20 2017-05-25 Weatherford Technology Holdings, Llc Operational control of wellsite pumping unit with continuous position sensing
US20170146007A1 (en) * 2015-11-20 2017-05-25 Weatherford Technology Holdings, Llc Operational control of wellsite pumping unit with displacement determination
US10113883B1 (en) * 2016-01-08 2018-10-30 Control Products, Inc. Hybrid sensor system and method of use
JP6637771B2 (ja) * 2016-01-19 2020-01-29 三桜工業株式会社 シリンダハウジング、アクチュエータ及びシリンダハウジングの製造方法
US10344573B2 (en) 2016-03-08 2019-07-09 Weatherford Technology Holdings, Llc Position sensing for wellsite pumping unit
JP2018071601A (ja) * 2016-10-26 2018-05-10 株式会社東和製作所 流体シリンダ
JP6960157B2 (ja) * 2017-11-30 2021-11-05 株式会社東和製作所 流体シリンダ
JP2022138918A (ja) * 2021-03-11 2022-09-26 株式会社東和製作所 流体シリンダ及び流体シリンダシステム
CN112943741A (zh) * 2021-04-08 2021-06-11 娄底市中兴液压件有限公司 内置位移传感器的液压缸组件
CN116558402B (zh) * 2023-07-06 2023-09-26 广东润宇传感器股份有限公司 一种内置压力变送器的位移传感器及其制造方法
CN118188645B (zh) * 2024-05-14 2024-08-27 宁波顶趣汽车技术有限公司 内置位移传感器的液压缸及液压阻尼装置

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DE10044984A1 (de) * 2000-09-11 2002-03-21 Mannesmann Rexroth Ag Hydraulischer Zylinder
US20050189937A1 (en) * 2002-12-31 2005-09-01 Blubaugh James F. Position sensing cylinder cap for ease of service and assembly
JP2007509290A (ja) * 2003-10-17 2007-04-12 クラーク イクィップメント カンパニー 液圧シリンダに対するストローク位置センサに対する方法及び装置
US20130174727A1 (en) * 2010-10-26 2013-07-11 Jlg Industries, Inc. Cylinder length sensor mounting/retaining assembly

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US6509733B2 (en) * 2000-12-20 2003-01-21 Caterpillar Inc Fluid cylinder with embedded positioning sensor
US6725761B1 (en) * 2002-09-30 2004-04-27 Prince Manufacturing Corporation Spooling device assembly for hydraulic cylinder and method of assembling same
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JP4733481B2 (ja) 2005-09-09 2011-07-27 カヤバ工業株式会社 シリンダ装置
CN201554714U (zh) * 2009-10-24 2010-08-18 中船重工中南装备有限责任公司 内置式线性位移传感器液压缸

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10044984A1 (de) * 2000-09-11 2002-03-21 Mannesmann Rexroth Ag Hydraulischer Zylinder
US20050189937A1 (en) * 2002-12-31 2005-09-01 Blubaugh James F. Position sensing cylinder cap for ease of service and assembly
JP2007509290A (ja) * 2003-10-17 2007-04-12 クラーク イクィップメント カンパニー 液圧シリンダに対するストローク位置センサに対する方法及び装置
US20130174727A1 (en) * 2010-10-26 2013-07-11 Jlg Industries, Inc. Cylinder length sensor mounting/retaining assembly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104832495A (zh) * 2015-03-31 2015-08-12 徐州重型机械有限公司 悬挂油缸以及起重机
CN104895863A (zh) * 2015-05-18 2015-09-09 合肥长源液压股份有限公司 带有一体式缸底的伺服液压缸
CN112460100A (zh) * 2020-11-26 2021-03-09 燕山大学 一种推压-拉拔液压缸、液压系统及其工作方法

Also Published As

Publication number Publication date
JP2015031298A (ja) 2015-02-16
JP5865876B2 (ja) 2016-02-17
KR20160037165A (ko) 2016-04-05
CN105492781A (zh) 2016-04-13
US20160177982A1 (en) 2016-06-23
US9879703B2 (en) 2018-01-30

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