EP0779435B1 - Hydraulischer Arbeitszylinder - Google Patents

Hydraulischer Arbeitszylinder Download PDF

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Publication number
EP0779435B1
EP0779435B1 EP96119960A EP96119960A EP0779435B1 EP 0779435 B1 EP0779435 B1 EP 0779435B1 EP 96119960 A EP96119960 A EP 96119960A EP 96119960 A EP96119960 A EP 96119960A EP 0779435 B1 EP0779435 B1 EP 0779435B1
Authority
EP
European Patent Office
Prior art keywords
power cylinder
damping
hydraulic power
shut
mandrel
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.)
Expired - Lifetime
Application number
EP96119960A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0779435A3 (de
EP0779435A2 (de
Inventor
Josef Büter
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.)
Buemach Engineering International BV
Original Assignee
Buemach Engineering International BV
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 Buemach Engineering International BV filed Critical Buemach Engineering International BV
Publication of EP0779435A2 publication Critical patent/EP0779435A2/de
Publication of EP0779435A3 publication Critical patent/EP0779435A3/de
Application granted granted Critical
Publication of EP0779435B1 publication Critical patent/EP0779435B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F15B15/222—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston with a piston extension or piston recess which throttles the main fluid outlet as the piston approaches its end position

Definitions

  • the invention relates to a hydraulic working cylinder, especially plunger cylinders for a forklift or the like, according to the preamble of claim 1.
  • this Art (DE-AS 12 41 712) has one in a working cylinder movable working piston also an end Brake chamber in which a braking part axially movable so is recorded that when it is supported at the forehead part of the pressure medium in one Brake space remains.
  • a braking part axially movable so is recorded that when it is supported at the forehead part of the pressure medium in one Brake space remains.
  • Over an annular gap between the Brake chamber wall and the brake part can be the pressure medium be derived so that with the further axial movement of the working piston to the front end of the working cylinder end cushioning is reached.
  • the invention has for its object a hydraulic To create working cylinders with little technical effort and structurally simple components one sufficient even with long braking distances of the working piston strong end position damping enables as well as additional Makes control components unnecessary.
  • shut-off pin points to any cylinder length with long braking distance adaptable damping tube part with which in the damping position, for example on working cylinders for forklifts, Lifting devices and the like, a sufficient strong and progressively adjustable damping effect is reached over long braking distances.
  • shut-off pin At initiation the stroke of the working cylinder is the shut-off pin in the direction of flow against a stop of the type Valve adjustment axially adjustable so that with this Shut-off pin as a single component an efficiently controllable, additional non-return valves dispensing working cylinder is created.
  • Fig. 1 is an overall designated 1 cylinder shown, in its surrounded by the cylinder tube 2 ' Cylinder interior 2 a movable working piston 5 provided with an essentially tubular piston rod 5 ' is.
  • the cylinder work area is at the end with a cylinder base 3 and a cylinder head 4 provided as closure parts.
  • a pressure medium can be fed such that the working piston 5 in the working direction (arrow A) to Cylinder head 4 is moved out. After this stroke the working piston 5 moves back into the one shown Starting position according to FIG. 1, this Movement (arrow B) in the area of end position damping 7 is braked near the cylinder bottom 3.
  • the working cylinder 1 points in this front end position damping area 7 according to Art a damping piston formed shut-off pin 9, one end directly in the area of the cylinder base 3 is held and on the other hand with its as a damping tube part 10 trained mandrel area in the stroke end position piston 5 moved towards cylinder head 4 protrudes freely into the cylinder working space 2 (Fig. 2).
  • the shut-off pin 9 is below Effect of the hydraulic connection 6 in the pressure flow direction (Arrow A in Fig. 1) introduced pressure medium a stop 15 axially displaceable.
  • the Shut-off pin 9 has a double function, since this is both in Damping position like a valve body on the inside Edge area 16 of the front hydraulic connection 6 in can be applied to a gasket intervention as well as during introduction of the working pressure in a check valve type opening passage position can be brought.
  • this design of the end position damping 7 is a Surprisingly simple and additional control component unnecessary making component arrangement for as a plunger trained working cylinder 1 created.
  • the shut-off pin 9 is in an appropriate design (Fig. 4) one end of the damping tube part 10 with one to the edge area 16 of the hydraulic connection 6 directed flange part 17 provided, which in turn at least in some areas in a provided in the wall of the cylinder tube 2 ' Support groove 18 engages as a stop 15 such that about whose width dimension S is the axial displacement path of the shut-off mandrel 9 is limited (Fig. 3).
  • Fig. 3 To the edge area 16 of the Hydraulic connection 6 has the flange part 17 one in the damping position the sealing engagement on the front forming mold approach 20.
  • this embodiment of the shut-off pin 9 according to FIG. 5 this has a direct instead of the flange part in the front end area of the working cylinder 1 engaging support lug 23, wherein in its engagement area to the cylinder bottom 3 the axial stop 15 ' of the shut-off pin 9 from a with a groove 24 in the support approach 23 corresponding spring ring 25 is formed.
  • this embodiment of the shut-off pin 9 with the support approach 23 this has a directly in the damping position the front seat surface forming the sealing engagement 26 on.
  • Flow channels (not shown) are provided.
  • the enlarged individual representation of the shut-off pin 9 according to Fig. 4 illustrates in conjunction with the embodiment of the working cylinder 1 according to FIG. 6 is the appropriate one Formation of the damping tube part 10, this on Outer circumference with an at least partially in Damping position with the brake chamber wall 13 a Gap expansion forming recess 28 is provided.
  • This shape recess 28 is advantageous from one Spiral groove 29 formed with a progressive damping of the working piston 5, for example, thereby achieved can be that the spiral groove 29 one for free End of the damping tube part 10 enlarging Has flow cross-section.
  • shut-off pin 9 is another, similar to the embodiment 1 designed end position damping 7, the shut-off pin 9 via a compression spring 30 in the Installation position is maintained that also in the free support position (Fig. 2) a deviation of the shut-off from the coaxial position with the cylinder longitudinal axis 31 secure is avoided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Vehicle Body Suspensions (AREA)
  • Fluid-Damping Devices (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Braking Arrangements (AREA)
EP96119960A 1995-12-16 1996-12-12 Hydraulischer Arbeitszylinder Expired - Lifetime EP0779435B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29519991U DE29519991U1 (de) 1995-12-16 1995-12-16 Hydraulischer Arbeitszylinder
DE29519991U 1995-12-16

Publications (3)

Publication Number Publication Date
EP0779435A2 EP0779435A2 (de) 1997-06-18
EP0779435A3 EP0779435A3 (de) 1998-07-29
EP0779435B1 true EP0779435B1 (de) 2001-11-14

Family

ID=8016834

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96119960A Expired - Lifetime EP0779435B1 (de) 1995-12-16 1996-12-12 Hydraulischer Arbeitszylinder

Country Status (5)

Country Link
EP (1) EP0779435B1 (da)
AT (1) ATE208858T1 (da)
DE (2) DE29519991U1 (da)
DK (1) DK0779435T3 (da)
ES (1) ES2168431T3 (da)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202020004533U1 (de) 2020-10-28 2022-02-04 Bümach Engineering International B.V. Endlagengedämpfter Arbeitszylinder

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202004011993U1 (de) * 2004-07-30 2005-12-08 Liebherr-Werk Nenzing Ges.M.B.H. Kolben-/Zylindereinheit

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2338845A (en) * 1941-10-10 1944-01-11 Curtiss Wright Corp Hydraulic piston snubber
DE1241712B (de) 1963-06-26 1967-06-01 Hydraulik Rochlitz Veb Bremsung fuer hydraulische oder pneumatische Geraete, vorzugsweise fuer Arbeitszylinder mit nur einfach gefuehrter Kolbenstange
US3419114A (en) * 1967-09-18 1968-12-31 Houdaille Industries Inc Hydraulic action devices with inertia insensitive snubbing circuit
CH551570A (de) * 1974-03-04 1974-07-15 Bbc Brown Boveri & Cie Hydraulischer antrieb, insbesondere fuer elektrische schaltgeraete.
DE2755878A1 (de) * 1977-12-15 1979-06-21 Licentia Gmbh Hydraulik-arbeitszylinder mit einstellbarer daempfung
DE3445481A1 (de) * 1983-12-16 1985-06-27 E.A. Storz Gmbh & Co Kg, 7200 Tuttlingen Hydraulikzylinderaggregat
JP2696743B2 (ja) * 1993-12-09 1998-01-14 エスエムシー株式会社 速度制御機構付ロッドレスシリンダ

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202020004533U1 (de) 2020-10-28 2022-02-04 Bümach Engineering International B.V. Endlagengedämpfter Arbeitszylinder
EP3992469A1 (de) 2020-10-28 2022-05-04 Bümach Engineering International B.V. Endlagengedämpfter arbeitszylinder

Also Published As

Publication number Publication date
EP0779435A3 (de) 1998-07-29
ATE208858T1 (de) 2001-11-15
ES2168431T3 (es) 2002-06-16
DE59608194D1 (de) 2001-12-20
DE29519991U1 (de) 1997-04-10
DK0779435T3 (da) 2002-03-11
EP0779435A2 (de) 1997-06-18

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