WO2018134244A1 - Ensemble cylindre-piston dont le cylindre est composé d'un matériau composite renforcé de fibres - Google Patents

Ensemble cylindre-piston dont le cylindre est composé d'un matériau composite renforcé de fibres Download PDF

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Publication number
WO2018134244A1
WO2018134244A1 PCT/EP2018/051099 EP2018051099W WO2018134244A1 WO 2018134244 A1 WO2018134244 A1 WO 2018134244A1 EP 2018051099 W EP2018051099 W EP 2018051099W WO 2018134244 A1 WO2018134244 A1 WO 2018134244A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
cylinder
piston device
recess
head
Prior art date
Application number
PCT/EP2018/051099
Other languages
German (de)
English (en)
Inventor
Hans-Peter Lavergne
Anton STAIMER
Original Assignee
Liebherr-Components Kirchdorf GmbH
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 Liebherr-Components Kirchdorf GmbH filed Critical Liebherr-Components Kirchdorf GmbH
Priority to EP18702142.3A priority Critical patent/EP3555484A1/fr
Publication of WO2018134244A1 publication Critical patent/WO2018134244A1/fr

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
    • F15B15/08—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
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • F15B15/1452—Piston 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/24—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with rigid separating means, e.g. pistons
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/31—Accumulator separating means having rigid separating means, e.g. pistons
    • F15B2201/312—Sealings therefor, e.g. piston rings

Definitions

  • the invention relates to a cylinder-piston device, in particular a hydraulic accumulator, with a cylinder made of a fiber composite material and at least one piston, which comprises at least one side surrounded by at least one wall recess.
  • Cylinder-piston devices are known from the prior art, which can be used for example as actuators, energy storage and / or damping devices.
  • sealing gaps can form or expand between the cylinder and the piston or between the pipe and the hydraulic piston. This expansion is dependent on factors such as the materials and dimensions of the cylinder-piston device and the pressure ratios in the cylinder-piston device. Large expansions can occur especially with thin-walled hydraulic cylinders and / or piston accumulators. The widening of the sealing gap can lead to a failure of the piston seal or to a decrease in the sealing effect of the piston seal. This also applies to the usually made of steel cylinder-piston devices, which should ensure low deformation of the pressurized components.
  • an improved piston-cylinder device is to be provided, which enables a safe functioning of the piston seal and thus of the entire piston-cylinder device even in a pressurized state.
  • This object is achieved by a cylinder-piston device with the features of claim 1.
  • Advantageous embodiments are the subject of the dependent claims.
  • the cylinder-piston device according to the invention can be used or designed as a hydraulic accumulator.
  • an embodiment is also conceivable as a damping device, as an actuator or as another cylinder-piston device.
  • the invention is not limited to a hydraulic device, but pneumatic devices are also included in the concept of the invention.
  • the cylinder-piston device comprises a preferably made of a fiber composite material but also of conventional materials - e.g. Steel - made cylinder.
  • a piston or a piston section may be provided which comprises on at least one side a recess surrounded by at least one wall.
  • the piston can have a variable or flexible structure in the radial direction of the piston.
  • the wall connected so flexibly with the further structure of the piston may further comprise at least one seal which is adapted to seal the sealing gap between the piston and cylinder.
  • the pressure present within the cylinder can act on the wall and thus press it radially outwardly against the inner wall of the cylinder.
  • the between cylinder and piston provided ne seal can thus always develop or ensure a sealing effect between the cylinder and the piston even with a pressurized and radially outwardly deformed cylinder. Due to the tight fit on the cylinder, the seal can also take over the function of the piston guide.
  • the recess has an at least partially trapezoidal cross section.
  • the trapezoidal cross section may be particularly easy to produce.
  • the corner regions of the substantially trapezoidal cross section may be rounded or otherwise deviating from a true trapezoid.
  • the recess may be oriented in a direction corresponding to the longitudinal direction of the cylinder-piston device.
  • the piston each comprises a recess on two opposite sides.
  • the two opposite sides can be spaced from each other in the radial direction of the piston or in the radial direction of the piston face each other.
  • Each of the two recesses can thus be assigned to a different region of the cylinder, in which, in particular, different pressure conditions can prevail or can be adjusted.
  • the two recesses have an at least partially trapezoidal cross section.
  • the trapezoidal cross sections of the two recesses may differ from each other or be identical.
  • both recesses are surrounded by walls and / or that seals are provided in the area of both walls.
  • the piston comprises a piston rod and a piston head coupled thereto.
  • the coupling between the piston rod and the piston head may be permanent or releasable.
  • the piston head may be that region of the piston on which the pressure of at least one working area or of at least one chamber of the cylinder acts or which separates the cylinder into at least two fluidically separated areas in which correspondingly different pressures can be set.
  • the piston head may comprise the section designated as wall or the sections designated as walls.
  • the piston head comprises a radially inwardly arranged passage, which is designed for coupling the piston rod to the piston head.
  • the bushing may, for example, comprise a thread or an internal thread into which a corresponding mating thread or an external thread of the piston rod can be screwed.
  • the passage for receiving a part of the piston rod and / or at least one locking means is formed.
  • the locking means can be, for example, at least one nut or at least one screw, which can be coupled to the coupling rod in the region of the bushing or in an area adjoining the bushing and, for example, can rest on the piston head in an edge region of the bushing.
  • a radially outer region of the piston head is formed symmetrically.
  • the symmetry of the radially outer region of the piston head can in this case relate to a symmetry in the axial direction of the piston head, so that two axially opposite sides of the piston head, which can be assigned to different working spaces of the cylinder, can be identical or approximately identical.
  • the piston head or a radially outer region of the piston head may additionally or alternatively be rotationally symmetrical or substantially rotationally symmetrical, with non-rotationally symmetric portions such as an internal thread for coupling the piston head to the piston rod obviously not detected by the rotational symmetry and / or the axis symmetry are.
  • the rotational symmetry may relate, for example, to the longitudinal axis of the cylinder-piston device.
  • the invention is further directed to a hydraulic piston for a cylinder-piston device according to one of claims 1 to 9.
  • the hydraulic piston may comprise on at least one side a recess surrounded by a wall and at least one seal and / or groove provided in the region of the wall on a radially outer side of the piston for receiving a seal.
  • the groove and / or the seal can be arranged on an opposite side of the wall of the recess.
  • the piston may have further or all of the features described in connection with the piston of the cylinder-piston device.
  • the single figure shows a cylinder-piston device according to the invention, which may for example be designed as a hydraulic accumulator.
  • a piston 2 is slidably mounted within a manufactured from a fiber composite cylinder 1.
  • the piston 2 to two axially opposite sides recesses 22, 22 ', which are each surrounded by a wall 21, 21'.
  • the axial direction is indicated by the dashed line A and corresponds substantially to the direction of movement of the piston 2 within the cylinder 1.
  • At least one single seal 23 may be provided, which is arranged on a wall 23 of a recess 22 for sealing the corresponding area.
  • the piston may thus be at least partially cup shaped and configured to expand under pressure.
  • the seals 23, 23 'and the seal 23 may in this case be arranged near the piston edge or the piston horn.
  • the two recesses 22, 22 ' are trapezoidal and / or identical in the embodiment of the figure. Also conceivable are deviating cross sections.
  • the cross-sections of the recesses 22, 22 'and the recesses 22, 22' ensure that can act on the walls 21, 21 'a pressure-related force in radially outward direction and thus the seals 23, 23' or at least one Seal 23 can press against or act against the inner wall of the cylinder 1.
  • seal 23, 23 'to be arranged in a region of the wall 21, 21' in which the recess 22, 22 'has a cavity for receiving pressurized fluid in the radially inward relation to the seal 23, 23' provides.
  • the seal 23, 23 'described Features of the invention always relate to an embodiment with each one of said components and vice versa.
  • the two walls 21, 21' have an at least partially common outer portion, in particular the cylinder 1 closest section of the walls 21, 21 'is.
  • at least some of the radially outer sections of the walls 21, 21 ' may have a particularly uniform cylindrical shape.
  • the two walls 21, 21 'surrounding the recesses 22, 22' may be hollow-cylindrical sections or sections which are hollow-cylinder-like or partially hollow-cylindrical.
  • the walls 21, 21 ' may comprise an outer hollow cylindrical portion which is recessed frustoconical on its inside.
  • the walls 21, 21 ' can be formed integrally with the remaining structure of the piston head 25.
  • the seals 23, 23 ' can be provided in a radially and / or axially outer region of the piston head 25 and / or can be provided in a region of the walls 21, 21' in which they have a smaller thickness or have a smaller radial extent, as areas of the walls 21, 21 'which are axially further in the center of the piston head 25.
  • the piston 2 may comprise a piston rod 24 and a piston head 25 coupled thereto, on which the wall 21, 21 ', the recesses 22, 22' and the seals 23, 23 'are arranged, as described above can.
  • a part or all of the components mentioned may also be formed integrally with the piston head 25 and / or may be simply provided on the piston 2.
  • the seal 23 or the seals 23, 23 ' can each be arranged in a groove provided for this purpose. The radial extent of the groove or the depth of the groove in the radial direction may be greater than the smallest radial extent or thickness of the walls 21, 21 '.
  • the piston rod 24 may be at least partially disposed in one of the recesses 22 '.
  • the piston rod may cause the recess 22 'to be in the form of a hollow rotational volume or body of revolution.
  • the piston rod 24 may further comprise at least two different diameters, wherein the diameter of the piston rod 24 in the region in which it is in contact with the piston head 25 may be the smaller or the smallest diameter of the piston rod 24.
  • the larger or the largest diameter of the piston rod 24 may be at least half the size of the diameter of the piston head 25.
  • the axial dimension of the piston head 25 may be less than 50%, in particular less than 25% and particularly preferably less than 10%. deviate from the radial dimension or the diameter of the piston head 25.
  • a stop or a shoulder can be provided, by means of which or by means of which the piston rod 24 can be fixed against the piston head 25 in at least one direction.
  • a passage 26 may be provided, which may be formed for coupling the piston rod 24 to the piston head 25.
  • the bushing 26 may include a thread and the piston rod 24 may include a corresponding mating thread which may be bolted together to couple the piston head 25 to the piston rod 24.
  • the passage 26 or an opening 26 adjacent the implementation of the piston head 25 may be formed for receiving at least a portion of the piston rod 24 and / or a locking means.
  • the piston head 25 may be at least partially symmetrical. It is conceivable that the piston head 25 is constructed mirror-symmetrically relative to a plane perpendicular to the longitudinal axis A of the cylinder-piston device and / or that it has at least partially rotationally symmetrical sections relative to the longitudinal axis A of the cylinder-piston device.
  • the radially inner region of the piston head 25 may be formed as a hollow cylinder and the walls 21, 21 'may connect directly to this radially inner region.
  • the piston head 25 may consist of the hollow cylindrical radially inner region and a directly adjoining wall 21.
  • the recess 22 may be at least partially bounded by the wall 21 and by the radially inner region of the piston head 25.
  • the recess 22 may further be bounded by a planar portion of the piston rod 24.
  • the planar portion may be an end portion of the piston rod 24.
  • the invention includes cylinder-piston devices of any type comprising a cylinder 1 made of a fiber composite material.
  • cylinder-piston devices of any type comprising a cylinder 1 made of a fiber composite material.
  • single or double-acting cylinder-piston devices are just as conceivable as cylinder-piston devices in which a piston rod 24 is provided on both sides of the piston head 25.
  • the piston 2 may be designed within the tube or the cylinder 1 so that it expands under pressure through its cup-shaped ends or recesses 22, 22 'and the external seals and / or the expansion of the tube or of the cylinder 1 follows , He compensates for the expansion and achieves a reduction in the expansion of the sealing gap between the piston 2 and tube or cylinder.
  • the piston 2 may be one or more parts and comprise components of metal and / or plastic.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)

Abstract

L'invention concerne un ensemble cylindre-piston, en particulier un accumulateur hydraulique, comportant un cylindre de préférence composé d'un matériau composite renforcé de fibres et au moins un piston qui comprend au moins sur un côté un évidement entouré par au moins une paroi. L'invention concerne par ailleurs un piston hydraulique conçu pour ledit ensemble cylindre-piston.
PCT/EP2018/051099 2017-01-17 2018-01-17 Ensemble cylindre-piston dont le cylindre est composé d'un matériau composite renforcé de fibres WO2018134244A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18702142.3A EP3555484A1 (fr) 2017-01-17 2018-01-17 Ensemble cylindre-piston dont le cylindre est composé d'un matériau composite renforcé de fibres

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017000362.9 2017-01-17
DE102017000362.9A DE102017000362A1 (de) 2017-01-17 2017-01-17 Zylinder-Kolben-Vorrichtung mit einem aus einem Faserverbundwerkstoff gefertigtem Zylinder

Publications (1)

Publication Number Publication Date
WO2018134244A1 true WO2018134244A1 (fr) 2018-07-26

Family

ID=61094446

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/051099 WO2018134244A1 (fr) 2017-01-17 2018-01-17 Ensemble cylindre-piston dont le cylindre est composé d'un matériau composite renforcé de fibres

Country Status (3)

Country Link
EP (1) EP3555484A1 (fr)
DE (1) DE102017000362A1 (fr)
WO (1) WO2018134244A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113404746A (zh) * 2021-08-19 2021-09-17 中国电建集团透平科技有限公司 一种轴流风机叶片控制系统及方法
WO2022052359A1 (fr) * 2020-09-08 2022-03-17 江苏新扬新材料股份有限公司 Matrice de pavage à piston composite en fibres de carbone

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111043101B (zh) * 2019-12-26 2022-04-01 长春工业大学 一种采用旋转式超声波螺母解耦型单作用锁紧气缸
CN111059097B (zh) * 2019-12-26 2021-09-14 长春工业大学 一种基于超声减摩效应的环形磁耦式直线锁紧气缸

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1155390A (fr) * 1956-08-02 1958-04-25 Nouvelle disposition de joint étanche pour déplacement rectiligne
US3015345A (en) * 1958-06-02 1962-01-02 Martin Marietta Corp Combination reservoir-accumulator arrangement for hydraulic system
DE2240394A1 (de) * 1972-08-17 1974-02-28 Licentia Gmbh Hydro-pneumatischer kraftspeicher
US4651782A (en) * 1986-04-29 1987-03-24 Allied Corporation Pressure-balanced seals for vented accumulators
DE19650434A1 (de) * 1996-12-05 1998-06-10 Zahnradfabrik Friedrichshafen Hochdruckspeicher für hydraulische Systeme
DE19725240A1 (de) * 1997-06-14 1998-12-17 Itt Mfg Enterprises Inc Druckmittelspeicher insbesondere für Hydraulikaggregate von elektronischen Bremssystemen für Kfz
EP1239196A2 (fr) * 2001-03-08 2002-09-11 Carl Freudenberg KG Accumulateur à piston
US20050194054A1 (en) * 2004-03-08 2005-09-08 Moskalik Andrew J. Lightweight low permeation piston-in-sleeve accumulator
EP2239468A1 (fr) * 2009-04-06 2010-10-13 Robert Bosch GmbH Accumulateur à piston
WO2011023747A1 (fr) * 2009-08-26 2011-03-03 Olaer As Accumulateur à piston composite
CN102966623A (zh) * 2012-12-11 2013-03-13 徐州永佳液压设备有限公司 一种高负载低摩擦液压缸
DE102013220093A1 (de) * 2013-10-02 2015-04-02 Robert Bosch Gmbh Kolbenspeicher
DE102013220094A1 (de) * 2013-10-02 2015-04-02 Robert Bosch Gmbh Kolbenspeicher
DE102014204617A1 (de) * 2014-03-13 2015-09-17 Zf Friedrichshafen Ag Schaltvorrichtung eines automatisierten Schaltgetriebes

Family Cites Families (3)

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Publication number Priority date Publication date Assignee Title
DE1804037U (de) 1959-08-31 1960-01-14 Hans Glaeser Bettungsschale fuer vibrationsmassagegeraete.
IT1185613B (it) 1985-05-30 1987-11-12 Magnaghi Cleodinamica Spa Accumulatore di pressione gas-olio con struttura in materiali compositi per circuiti idraulici di velivoli
US5363744A (en) 1993-12-07 1994-11-15 Federal-Mogul Corporation Accumulator piston having multiple elastomeric seals

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1155390A (fr) * 1956-08-02 1958-04-25 Nouvelle disposition de joint étanche pour déplacement rectiligne
US3015345A (en) * 1958-06-02 1962-01-02 Martin Marietta Corp Combination reservoir-accumulator arrangement for hydraulic system
DE2240394A1 (de) * 1972-08-17 1974-02-28 Licentia Gmbh Hydro-pneumatischer kraftspeicher
US4651782A (en) * 1986-04-29 1987-03-24 Allied Corporation Pressure-balanced seals for vented accumulators
DE19650434A1 (de) * 1996-12-05 1998-06-10 Zahnradfabrik Friedrichshafen Hochdruckspeicher für hydraulische Systeme
DE19725240A1 (de) * 1997-06-14 1998-12-17 Itt Mfg Enterprises Inc Druckmittelspeicher insbesondere für Hydraulikaggregate von elektronischen Bremssystemen für Kfz
EP1239196A2 (fr) * 2001-03-08 2002-09-11 Carl Freudenberg KG Accumulateur à piston
US20050194054A1 (en) * 2004-03-08 2005-09-08 Moskalik Andrew J. Lightweight low permeation piston-in-sleeve accumulator
EP2239468A1 (fr) * 2009-04-06 2010-10-13 Robert Bosch GmbH Accumulateur à piston
WO2011023747A1 (fr) * 2009-08-26 2011-03-03 Olaer As Accumulateur à piston composite
CN102966623A (zh) * 2012-12-11 2013-03-13 徐州永佳液压设备有限公司 一种高负载低摩擦液压缸
DE102013220093A1 (de) * 2013-10-02 2015-04-02 Robert Bosch Gmbh Kolbenspeicher
DE102013220094A1 (de) * 2013-10-02 2015-04-02 Robert Bosch Gmbh Kolbenspeicher
DE102014204617A1 (de) * 2014-03-13 2015-09-17 Zf Friedrichshafen Ag Schaltvorrichtung eines automatisierten Schaltgetriebes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022052359A1 (fr) * 2020-09-08 2022-03-17 江苏新扬新材料股份有限公司 Matrice de pavage à piston composite en fibres de carbone
CN113404746A (zh) * 2021-08-19 2021-09-17 中国电建集团透平科技有限公司 一种轴流风机叶片控制系统及方法
CN113404746B (zh) * 2021-08-19 2021-11-09 中国电建集团透平科技有限公司 一种轴流风机叶片控制系统及方法

Also Published As

Publication number Publication date
DE102017000362A1 (de) 2018-07-19
EP3555484A1 (fr) 2019-10-23

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