WO2004099724A3 - Hydraulic cylinder with piston and a magnetic layer on the piston rod for piston position determination - Google Patents

Hydraulic cylinder with piston and a magnetic layer on the piston rod for piston position determination Download PDF

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Publication number
WO2004099724A3
WO2004099724A3 PCT/US2004/014172 US2004014172W WO2004099724A3 WO 2004099724 A3 WO2004099724 A3 WO 2004099724A3 US 2004014172 W US2004014172 W US 2004014172W WO 2004099724 A3 WO2004099724 A3 WO 2004099724A3
Authority
WO
WIPO (PCT)
Prior art keywords
piston
piston rod
magnetic layer
hydraulic cylinder
position determination
Prior art date
Application number
PCT/US2004/014172
Other languages
French (fr)
Other versions
WO2004099724A2 (en
Inventor
Thomas P Low
C Bruce Clark
Ronald E Pelrine
Joseph S Eckerle
Chris Smith
Original Assignee
Stanford Res Inst Int
Thomas P Low
C Bruce Clark
Ronald E Pelrine
Joseph S Eckerle
Chris Smith
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 Stanford Res Inst Int, Thomas P Low, C Bruce Clark, Ronald E Pelrine, Joseph S Eckerle, Chris Smith filed Critical Stanford Res Inst Int
Priority to CA002524264A priority Critical patent/CA2524264A1/en
Priority to BRPI0410120-0A priority patent/BRPI0410120A/en
Priority to JP2006514310A priority patent/JP2006525529A/en
Priority to EP04760724.7A priority patent/EP1620702B1/en
Publication of WO2004099724A2 publication Critical patent/WO2004099724A2/en
Publication of WO2004099724A3 publication Critical patent/WO2004099724A3/en

Links

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
    • F15B15/2846—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using detection of markings, e.g. markings on the piston rod
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/3207—Constructional features
    • F16F9/3221—Constructional features of piston rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/3292—Sensor arrangements
    • 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
    • G01D5/14—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 the magnitude of a current or voltage
    • G01D5/142—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 the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—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 the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/7368—Non-polymeric layer under the lowermost magnetic recording layer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F10/00—Thin magnetic films, e.g. of one-domain structure
    • H01F10/08—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers
    • H01F10/10—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition
    • H01F10/12—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition being metals or alloys
    • H01F10/16—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition being metals or alloys containing cobalt

Abstract

Described are a system and method of recording piston rod position information in a magnetic layer on the piston rod. A piston rod moving with respect to a cylinder has a magnetically hard layer formed thereon to provide a recording medium. A magnetic pattern is recorded in the magnetically hard layer. A magnetic field sensor senses the recorded magnetic pattern while the piston rod is moving with respect to the cylinder and generates signals in response to the magnetic pattern that are used to determine an instantaneous position of the piston rod.
PCT/US2004/014172 2003-05-06 2004-05-06 Hydraulic cylinder with piston and a magnetic layer on the piston rod for piston position determination WO2004099724A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CA002524264A CA2524264A1 (en) 2003-05-06 2004-05-06 Systems and methods of recording piston rod position information in a magnetic layer on a piston rod
BRPI0410120-0A BRPI0410120A (en) 2003-05-06 2004-05-06 systems and methods of recording piston rod position information in a magnetic layer on a piston rod
JP2006514310A JP2006525529A (en) 2003-05-06 2004-05-06 System and method for recording piston rod position information in a magnetic layer on a piston rod
EP04760724.7A EP1620702B1 (en) 2003-05-06 2004-05-06 Hydraulic cylinder with piston and a magnetic layer on the piston rod for piston position determination

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US46850703P 2003-05-06 2003-05-06
US60/468,507 2003-05-06

Publications (2)

Publication Number Publication Date
WO2004099724A2 WO2004099724A2 (en) 2004-11-18
WO2004099724A3 true WO2004099724A3 (en) 2005-02-24

Family

ID=33435186

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/014172 WO2004099724A2 (en) 2003-05-06 2004-05-06 Hydraulic cylinder with piston and a magnetic layer on the piston rod for piston position determination

Country Status (6)

Country Link
US (5) US6989669B2 (en)
EP (1) EP1620702B1 (en)
JP (2) JP2006525529A (en)
BR (1) BRPI0410120A (en)
CA (1) CA2524264A1 (en)
WO (1) WO2004099724A2 (en)

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US6989669B2 (en) 2006-01-24
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US7034527B2 (en) 2006-04-25
US20060192552A1 (en) 2006-08-31
US20080143324A1 (en) 2008-06-19
WO2004099724A2 (en) 2004-11-18
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US20040222788A1 (en) 2004-11-11
CA2524264A1 (en) 2004-11-18
US20060038556A1 (en) 2006-02-23
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US7307418B2 (en) 2007-12-11
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