EP3428460A1 - Hydraulikzylinder - Google Patents

Hydraulikzylinder Download PDF

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Publication number
EP3428460A1
EP3428460A1 EP17181473.4A EP17181473A EP3428460A1 EP 3428460 A1 EP3428460 A1 EP 3428460A1 EP 17181473 A EP17181473 A EP 17181473A EP 3428460 A1 EP3428460 A1 EP 3428460A1
Authority
EP
European Patent Office
Prior art keywords
cylindrical housing
sensor head
piston
wall
hydraulic 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.)
Withdrawn
Application number
EP17181473.4A
Other languages
English (en)
French (fr)
Inventor
Jose Rodrigues Da Costa
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.)
Hydraulique Production Systems SAS
Original Assignee
Hydraulique Production Systems SAS
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 Hydraulique Production Systems SAS filed Critical Hydraulique Production Systems SAS
Priority to EP17181473.4A priority Critical patent/EP3428460A1/de
Priority to PCT/EP2018/067883 priority patent/WO2019011713A1/fr
Publication of EP3428460A1 publication Critical patent/EP3428460A1/de
Withdrawn legal-status Critical Current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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1438—Cylinder to end cap assemblies
    • 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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1428—Cylinders
    • 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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1438—Cylinder to end cap assemblies
    • F15B15/1442—End cap sealings
    • 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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
    • 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
    • F15B15/2815—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

Definitions

  • the invention relates to a hydraulic cylinder designed to ensure a perfect seal and to be implemented in a facility without risk for a nearby operator during operation of the installation.
  • It also relates to improvements in the field of hydraulic cylinders and in particular obtaining accurate information on the operating state of the cylinder.
  • incompressible fluid any incompressible or quasi-incompressible fluid, that is to say fluids capable of containing an emulsion of a compressible fluid (gas) with an incompressible fluid and may therefore have a small volume variation with the pressure.
  • Hydraulic cylinders comprising a body, the body having a wall delimiting an internal cylindrical housing, having a cylindrical housing axis.
  • a piston is movably mounted in displacement in the cylindrical housing, said piston separating said cylindrical housing into two sealed chambers and isolated from one another.
  • two end walls sealingly close said cylindrical housing and a rigid rod, integral with the piston and coaxial with the cylindrical housing through a passage opening formed in one of the two end walls.
  • some cylinders have two longitudinal passages made parallel to the axis of the cylindrical housing in the cylindrical wall of the body, each of the longitudinal passages having an inlet which opens on the edge of said cylindrical body, and an outlet which opens into one (or the other) of the two chambers, so that each longitudinal passage supplies fluid to each of the two chambers.
  • the two longitudinal passages used to feed each of the chambers have their inlet which is located at one end of the cylinder body (on an edge of the cylindrical body).
  • inlet (or outlet) of the fluid introduced (or outgoing) into one and / or the other of the two chambers is necessarily at one or the other end of the cylinder body.
  • two radial bores are made at the desired location (depending on the installation) so that each of the two radial bores has an inlet located laterally to the cylinder body and an outlet that opens into one or the other of the two longitudinal passages.
  • the two radial holes connect the outside of the body to a longitudinal hole.
  • plugs are designed to withstand a predetermined pressure. If there is an excess pressure inside the cylinder during its implementation, it can happen that the caps are violently expelled longitudinal holes, which is extremely dangerous for operators nearby.
  • the invention aims to eliminate the use of such plugs.
  • It relates to a cylinder as defined above, which is remarkable in that the edge of the body has, around each of the longitudinal passage inlets, an annular groove hosting an O-ring sealing and in that two end walls , attached to the ends of the body, each crush an O-ring between the bottom of the annular groove which receives said seal and a surface of the end wall which is oriented towards said cylindrical housing.
  • the seal is achieved by crushing a seal trapped between an end wall and the surface of the rim of the cylinder body, the seal being wedged in a groove to ensure its proper positioning during the fixing of the end wall on the cylinder body, for example by screwing.
  • the jack is designed to provide accurate data on its operating condition.
  • the invention thus relates to a secure cylinder, as defined above, which further comprises a position sensor.
  • the figure 1 shows a cylinder according to the invention, comprising a body 1 of generally parallelepiped external shape.
  • Body 1 has one internal cylindrical housing 2.
  • a wall 3 delimits the cylindrical inner housing and has a different wall thickness at different locations of the body 1. This difference in wall thickness is due to the fact that the cylindrical housing, of axis X, is realized eccentric with respect to the axis X1 of the body 1 of the jack.
  • the figures 2 and 4 shows that the wall is of the same thickness on the side portions P3 and P4 of the body (as it is positioned in the figures).
  • the internal housing 2 comprises a piston.
  • the piston 4 is mounted movably in displacement in the housing 2 under the effect of pressures exerted on either side of the piston by introduction of fluid on either side of the piston in the housing.
  • the piston 4 makes a seal against the inner surface of the wall of the housing 2, so that it defines two inner chambers 5 and 6 which are sealed and isolated from each other.
  • longitudinal passages 7 and 8 have been made in the thickness of the part P2.
  • the passages 7 and 8 have a longitudinal portion whose axis is parallel to the axis X of the cylindrical housing 2.
  • the inlet 9 or 10 of each of the passages 7 and 8, respectively, is located at one end of the body 1, on opposite edges 11 and 12 of the body 1.
  • the passages 7 and 8 each comprise a portion bent so as to have an outlet, respectively 13 and 14, which opens respectively into each of the chambers 5 and 6.
  • the passages 7 and 8 allow the introduction or the evacuation of a fluid in each of the chambers 5 and 6, respectively.
  • two radial bores 15 and 16 are made through the wall of the body, in the thickest portion P2 having the two passages 7 and 8. These radial bores 15 and 16 are visible in figure 1 only. They are made radially in the wall 3 of the body, and they each laterally connect the outside of the body 1 to a longitudinal passage: the radial bore 15 connects the outside of the body 1 to the longitudinal passage 7 and the radial bore 16 connects the outside of body 1 to longitudinal passage 8.
  • the end walls 17 and 18 are of rectangular shape, and have substantially the same sectional shape as that of the body 1.
  • Each of the end walls 17 and 18 has a through opening 20 and 21, respectively, whose utility will be explained later.
  • annular groove 22 or 23 is formed in the wall thickness, around each of the inlets 9 and 10, in the edges 11 and 12 of the body 1.
  • a seal sealing ring 24 or 25 is placed in each of the grooves 22 or 23, respectively, and is crushed between the bottom of the grooves 22 or 23 and the end walls 17 or 18. In this way, the inlets 9 and 10 are tightly closed.
  • Each of the inlets of the radial bores 15 and 16 is surrounded by grooves 27 and 28, respectively, and each groove 27 and 28 accommodates an O-ring 29 and 30 respectively.
  • the seal is obtained by fixing the jack on the surface of the mold, pressing the surface 26 of the jack against the surface of the mold for example by screwing, which compresses the seals 29 and 30, ensuring sealing.
  • the fixing of the jack is done by screwing through through holes 31 formed in the body 1 of the jack through wall 3 and shown in FIG. figure 2 .
  • the jack comprises a rigid rod 32 secured to the piston 4 and coaxial with the inner cylindrical housing 2.
  • This rigid rod 32 exits and enters the body 1 of the cylinder, following the movement of the piston, and moves objects placed against its free end 33.
  • the free end of the rigid rod 32 may comprise a threaded blind hole 34 for fixing an element, for example.
  • a first sealing part 35 which closes the opening 20 of the end wall 17 of the jack.
  • the rigid rod 32 passes through the first sealing part 35.
  • the rod 32 is guided axially through the first sealing part 35 by means of a series of several rings 36 internal to the first sealing part 35, the rings being salient. and distributed over the entire length of the sealing part 35.
  • first sealing part 35 bears at least partially against the inner wall of the cylindrical housing 2 (see FIG. figures 1 and 2 ).
  • a second sealing part 37 closes the opening 21 formed in the end wall 18, opposite to the end wall 17.
  • the cylinder according to the invention thus produced, is waterproof and efficient.
  • Another objective at the origin of the invention was also to equip the jack with means to cannaitre precisely its state, and more particularly the position of the rod and the piston in the inner cylindrical housing: thus, the cylinder complies with the invention may provide elements specific to its operating state.
  • the jack comprises a position sensor, able to deliver information on the position of the rod 32 or the piston 4 in the cylindrical inner housing 2.
  • the position sensor 38 comprises a sensor head 39, integral with a sensor rod 40 around which is placed a magnet 41, and a connector 42 connected to the sensor head 39.
  • the magnet 41 is fitted around the rod 40 so as to be able to move along the rod 40.
  • the sensor head identifies its position on the rod 40: this is how the sensor generates position information.
  • the sensor rod 40 integral with the sensor head 39, exits the inner element 43 through an opening 44 formed in the inner element 43.
  • the sensor rod 40 passes through the piston 4 and is received at least partially in the rod 32 of the jack according to the invention.
  • the magnet 41 fitted around the sensor rod 40, is received in the piston and is fixed by means of a nut 45. Thus, when the piston 4 moves, the magnet 41 is also moved. This is how the sensor can precisely know the position of the piston in the inner housing 2. It is thus possible to control the stroke of the piston.
  • the connector 42 is connected to the sensor head 39 by any known means: the connector 42 receives the information generated by the sensor head 39 (In particular regarding the stroke of the jack) and it includes a cable (not shown) that transmits the information it receives to a remote information processing module.
  • the connector 42 is enclosed at least partially in the second sealing part 37 mentioned above.
  • the second sealing member 37 is adjacent to the sealed inner member 43 having the sensor head 39.
  • the sensor head 39 is projecting from one side of the sealed inner member 43.
  • the protruding portion of the sensor head 39 is received in the second sealing member 37.
  • the second piece of sealing 37 at least partially comprises the connector 42 and the sensor head 39.
  • the second sealing part comprises a chamber 46.
  • the chamber 46 provides a space capable of receiving the connecting pieces of the sensor head 39 and the connector 42, for example son connecting the two elements.
  • the cylinder incorporating the position sensor also protects the latter and the position sensor is easily integrated with the elements of the cylinder.
  • the jack proposed by the invention is more on the user than the cylinders comprising plugs, and how the jack according to the invention makes it possible to transmit precise information on its operating state, and in particular on the stroke of the piston in the cylindrical housing 2.
  • Such collected information is valuable for an operator who can anticipate a failure such as seizure of the cylinder, a broken rod, a leak ...

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
EP17181473.4A 2017-07-14 2017-07-14 Hydraulikzylinder Withdrawn EP3428460A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP17181473.4A EP3428460A1 (de) 2017-07-14 2017-07-14 Hydraulikzylinder
PCT/EP2018/067883 WO2019011713A1 (fr) 2017-07-14 2018-07-03 Verin hydraulique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17181473.4A EP3428460A1 (de) 2017-07-14 2017-07-14 Hydraulikzylinder

Publications (1)

Publication Number Publication Date
EP3428460A1 true EP3428460A1 (de) 2019-01-16

Family

ID=59366248

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17181473.4A Withdrawn EP3428460A1 (de) 2017-07-14 2017-07-14 Hydraulikzylinder

Country Status (2)

Country Link
EP (1) EP3428460A1 (de)
WO (1) WO2019011713A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2810370A (en) * 1954-01-18 1957-10-22 Pathon Mfg Company Combined power cylinder and valve construction
WO1986002054A1 (en) * 1984-10-03 1986-04-10 FUSSEDER, Günther Servo-steering motor
US6058826A (en) * 1998-06-08 2000-05-09 Dietrich; Otto E. Power steering cylinder assembly
EP1860328A1 (de) * 2006-05-27 2007-11-28 Asco Joucomatic GmbH Einrichtung zur Steuerung eines pneumatischen, insbesondere doppelwirkenden, Zylinders
US20090007770A1 (en) * 2004-03-10 2009-01-08 Sunstream Scientific Pneumatic cylinder for precision servo type applications

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2810370A (en) * 1954-01-18 1957-10-22 Pathon Mfg Company Combined power cylinder and valve construction
WO1986002054A1 (en) * 1984-10-03 1986-04-10 FUSSEDER, Günther Servo-steering motor
US6058826A (en) * 1998-06-08 2000-05-09 Dietrich; Otto E. Power steering cylinder assembly
US20090007770A1 (en) * 2004-03-10 2009-01-08 Sunstream Scientific Pneumatic cylinder for precision servo type applications
EP1860328A1 (de) * 2006-05-27 2007-11-28 Asco Joucomatic GmbH Einrichtung zur Steuerung eines pneumatischen, insbesondere doppelwirkenden, Zylinders

Also Published As

Publication number Publication date
WO2019011713A1 (fr) 2019-01-17

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