DE102005025505A1 - Hydraulic cylinder absorbing device e.g. for floor conveyance device, has piston, and base having circle cross section or circular projection and when immersing edge into recess cross section between surfaces is reduced - Google Patents
Hydraulic cylinder absorbing device e.g. for floor conveyance device, has piston, and base having circle cross section or circular projection and when immersing edge into recess cross section between surfaces is reduced Download PDFInfo
- Publication number
- DE102005025505A1 DE102005025505A1 DE200510025505 DE102005025505A DE102005025505A1 DE 102005025505 A1 DE102005025505 A1 DE 102005025505A1 DE 200510025505 DE200510025505 DE 200510025505 DE 102005025505 A DE102005025505 A DE 102005025505A DE 102005025505 A1 DE102005025505 A1 DE 102005025505A1
- Authority
- DE
- Germany
- Prior art keywords
- piston
- section
- cross
- projection
- channel
- 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.)
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or systems
-
- 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
- F16F9/48—Arrangements for providing different damping effects at different parts of the stroke
- F16F9/49—Stops limiting fluid passage, e.g. hydraulic stops or elastomeric elements inside the cylinder which contribute to changes in fluid damping
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- 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J10/00—Engine or like cylinders; Features of hollow, e.g. cylindrical, bodies in general
- F16J10/02—Cylinders designed to receive moving pistons or plungers
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Combustion & Propulsion (AREA)
- Chemical & Material Sciences (AREA)
- Transportation (AREA)
- Structural Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Actuator (AREA)
- Fluid-Damping Devices (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
Description
Die Erfindung bezieht sich auf eine Vorrichtung zur Dämpfung eines Hydraulikzylinders eines Flurförderzeuges in der eingefahrenen Endlage seines Kolbens nach dem Patentanspruch 1.The The invention relates to a device for damping a Hydraulic cylinder of a truck in the retracted end position of his piston according to the claim 1.
Hubzylinder in Flurförderzeugen zum Anheben und Absenken eines Lasttragmittels bzw. eines Mastes eines Hubgerüstes sind beim Absenken einer Last unter Umständen erheblichen Belastungen ausgesetzt, wenn der Kolben seine Endlage erreicht. Um zu heftige Anschläge bzw. Stöße zu vermeiden, ist bekannt, ein Dämpfungsmittel vorzusehen, durch welche der Kolben in der unteren Endlage gedämpft zum Stillstand gebracht wird. Es ist bekannt, hierfür z. B. Gummipuffer vorzusehen.lifting cylinder in industrial trucks for raising and lowering a load carrying means or a mast a mast may be a significant burden when lowering a load suspended when the piston reaches its end position. Too violent attacks or to avoid shocks, is known, a damping agent provide, by which the piston is damped in the lower end position to Standstill is brought. It is known for this purpose. B. provide rubber buffer.
Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zur Dämpfung eines Hydraulikzylinders eines Flurförderzeuges in der eingefahrenen Endlage seines Kolbens zu schaffen, die einfach aufgebaut ist und wirksam abdämpft, jedoch gleichzeitig beim Ausfahren des Kolbens einen ausreichenden Kolbenquerschnitt zur Verfügung stellt.Of the Invention is based on the object, a device for damping a Hydraulic cylinder of a truck in the retracted end position of his piston to create the easy is constructed and effectively damped, but at the same time when extending the piston a sufficient piston cross section to disposal provides.
Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst.These The object is solved by the features of claim 1.
Bei der Erfindung weist der Kolben an dem dem Zylinderboden zugewandten Ende einen im Querschnitt kreis- oder ringförmigen Vorsprung auf, der in seiner Endlage in eine im Querschnitt kreisförmige oder ringförmige Vertiefung des Zylinderbodens eintaucht. Mit der Vertiefung ist ein Austrittskanal im Zylinderboden verbunden, der mit dem Anschluß für die Zufuhr bzw. Abfuhr von Hydraulikmedium verbunden ist. Die vorzugsweise zylindrische Umfangsfläche des Vorsprungs und eine Wandfläche der Vertiefung sind so ausgebildet, daß ein Durchströmquerschnitt zwischen den Flächen allmählich auf einen Mindestquerschnitt reduziert wird, wenn sich der Kolben seiner Endlage unmittelbar nähert. Im Zylinderboden ist ein Nebenkanal vorgesehen, in dem ein Rückschlagventil angeordnet ist. Der Nebenkanal stellt eine Verbindung zwischen dem Austrittskanal und dem Zylinder her, wenn das Rückschlagventil geöffnet ist. Der Nebenkanal mündet an einer ausreichend großen, zugänglichen Endfläche des Kolbens.at the invention, the piston at the cylinder bottom facing End on a circular or annular cross-section projection on which in its end position in a circular cross-section or annular recess of the cylinder bottom dips. With the recess is an outlet channel connected in the cylinder bottom, with the connection for the supply and discharge of Hydraulic medium is connected. The preferably cylindrical peripheral surface of Ledge and a wall surface the recess are formed so that a flow area between the surfaces gradually is reduced to a minimum cross section when the piston immediately approaches its final position. In the cylinder bottom, a secondary channel is provided, in which a check valve is arranged. The secondary channel provides a link between the Outlet channel and the cylinder ago, when the check valve is open. The secondary channel opens on a sufficiently large, accessible end face of the piston.
Nach einer Ausgestaltung der Erfindung sind Vorsprung und Vertiefung zur Achse des Hydraulikkolbens bzw. des Zylinders koaxial.To An embodiment of the invention are projection and recess to the axis of the hydraulic piston or the cylinder coaxial.
Nach einer anderen Ausgestaltung der Erfindung ist der Vorsprung ein zylindrischer Zapfen, der sich zum freien Ende hin konisch verjüngt. Der Nebenkanal ist exzentrisch angeordnet. Alternativ ist nach einer weiteren Ausgestaltung der Erfindung vorgesehen, daß der Vorsprung ein Zylinderring ist, dessen dem freien Ende hin zugewandter Abschnitt konisch geformt ist, wobei der Nebenkanal koaxial angeordnet ist.To In another embodiment of the invention, the projection is a cylindrical pin which tapers conically towards the free end. Of the Secondary channel is arranged eccentrically. Alternatively, after a further embodiment of the invention provides that the projection a cylinder ring is, whose the free end facing portion is conically shaped, wherein the secondary channel is arranged coaxially.
Nach einer weiteren Ausgestaltung der Erfindung ist der Ventilsitz des Rückschlagventils im Kanal selbst ausgebildet.To A further embodiment of the invention is the valve seat of the check valve formed in the channel itself.
Bei der Erfindung wird eine Reihe von Vorteilen erzielt. Die Dämpfungswirkung wird mit Ausnahme des Rückschlagventils ohne bewegliche Teile erzielt. Es ist auch die Anordnung außermittiger Austrittskanäle möglich. Mithin ist die erfindungsgemäße Dämpfung nicht auf eine spezielle Anordnung der Austrittskanäle beschränkt.at The invention achieves a number of advantages. The damping effect is with the exception of the check valve achieved without moving parts. It is also the arrangement off-center outlet channels possible. Thus, the damping according to the invention is not limited to a special arrangement of the outlet channels.
Durch die freie Wahl der Geometrie von Vorsprung und Vertiefung ist jegliches gewünschtes Dämpfungsverhalten erzielbar. Die Kontur und die Länge des Vorsprunges sowie die Größe des verbleibenden Spaltes bestimmen die Dämpfungswirkung. Die Kontur ist vorzugsweise so geformt, daß zwischen ungedämpftem und gedämpftem Einfahren ein weicher Übergang entsteht.By the free choice of geometry of projection and depression is any desired damping behavior achievable. The contour and the length of the lead as well as the size of the remaining one Slits determine the damping effect. The Contour is preferably shaped so that between undamped and steamed Retract a soft transition arises.
Durch den Einsatz der erfindungsgemäßen hydraulischen Einfahrdämpfung kann auf einen mechanischen Anschlag völlig verzichtet werden.By the use of hydraulic according to the invention Einfahrdämpfung can be completely dispensed with a mechanical stop.
Trotz der wirksamen Einfahrdämpfung ist beim Ausfahren des Kolbens aus dem Zylinder ein ausreichend großer Abschnitt der Endfläche des Kolbens mit Hydraulikmedium beaufschlagt, wenn ein Ausfahrhub gewünscht wird. Das Ausfahren des Zylinders durch die Dämpfung wird im wesentlichen nicht beeinflußt.In spite of the effective insertion loss is sufficient when extending the piston out of the cylinder greater Section of the end face of the piston pressurized with hydraulic medium when an extension stroke required becomes. The extension of the cylinder by the damping is essentially not affected.
Die Erfindung wird nachfolgend anhand in den Zeichnungen dargestellten Ausführungsbeispielen näher erläutert.The The invention is illustrated below with reference to the drawings embodiments explained in more detail.
In
Wie
in
Beim
Absenken des Kolbens
Wird
der Kolben
Bei
dem Masthubzylinder
Im
Boden
Während des
Absenkens des Kolbens
Alternativ
zur Ausbildung des Rückschlagventils
nach den
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200510025505 DE102005025505A1 (en) | 2005-06-03 | 2005-06-03 | Hydraulic cylinder absorbing device e.g. for floor conveyance device, has piston, and base having circle cross section or circular projection and when immersing edge into recess cross section between surfaces is reduced |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200510025505 DE102005025505A1 (en) | 2005-06-03 | 2005-06-03 | Hydraulic cylinder absorbing device e.g. for floor conveyance device, has piston, and base having circle cross section or circular projection and when immersing edge into recess cross section between surfaces is reduced |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102005025505A1 true DE102005025505A1 (en) | 2006-12-07 |
Family
ID=37401895
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200510025505 Withdrawn DE102005025505A1 (en) | 2005-06-03 | 2005-06-03 | Hydraulic cylinder absorbing device e.g. for floor conveyance device, has piston, and base having circle cross section or circular projection and when immersing edge into recess cross section between surfaces is reduced |
Country Status (1)
Country | Link |
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DE (1) | DE102005025505A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2006539A2 (en) | 2007-06-19 | 2008-12-24 | Webasto AG | Reciprocating piston pump for transporting a liquid |
Citations (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2804052A (en) * | 1954-01-11 | 1957-08-27 | Tomkins Johnson Company | Cushioning structure for hydraulic cylinders |
US2853974A (en) * | 1955-10-31 | 1958-09-30 | Westinghouse Air Brake Co | Piston cushioning arrangement for cylinders |
US2923276A (en) * | 1955-12-12 | 1960-02-02 | Flick Reedy Corp | Head structure for a piston and cylinder device |
US2960068A (en) * | 1958-08-08 | 1960-11-15 | Logansport Machine Co Inc | Cylindrical cushion bushing |
DE6943766U (en) * | 1969-11-07 | 1970-03-26 | Montan Hydraulik Gmbh & Co Kg | HYDRAULIC CYLINDER WITH END POSITION DAMPING |
DE2603041A1 (en) * | 1976-01-28 | 1977-08-04 | Licentia Gmbh | Hydraulically driven circuit breaker - has dampening system with non return valves mounted in region of working cylinder bore |
DE2424975B2 (en) * | 1974-05-22 | 1977-10-06 | Montan-Hydraulik Gmbh & Co Kg, 4755 Holzwickede | HYDRAULIC CYLINDER WITH END POSITION DAMPING |
DE2619176A1 (en) * | 1976-04-30 | 1977-11-10 | Stabilus Gmbh | GAS SPRING WITH RELEASED EXTENSION FORCE WITH RETRACTED PISTON ROD |
FR2479389A1 (en) * | 1980-03-26 | 1981-10-02 | Komatsu Mfg Co Ltd | HYDRAULIC CYLINDER STROKE DAMPING DEVICE |
DE4322255C2 (en) * | 1993-07-05 | 1996-02-01 | Festo Kg | Damping device |
DE29812712U1 (en) * | 1998-05-14 | 1998-11-26 | Liebherr-Werk Bischofshofen Ges.M.B.H., Bischofshofen | End position damping for a piston-cylinder unit |
EP0974769A2 (en) * | 1998-07-22 | 2000-01-26 | Hainzl Industriesysteme Gesellschaft m.b.H. & Co. KG | Device for the braking of a piston in a hydraulic cylinder |
DE10161199A1 (en) * | 2000-12-20 | 2002-07-04 | Imi Norgren Gmbh | Servo cylinder with damping at end of piston travel has the damping duct in the piston and its corresponding recess in the cylinder end wall offset from the centre of the piston |
DE19754352B4 (en) * | 1996-12-06 | 2004-01-29 | Smc Corp. | Fluid pressure cylinder |
DE20315551U1 (en) * | 2003-10-07 | 2004-03-04 | Evesque, Christian | Compact damping system for hydraulic cylinder has a damping sleeve attached to the piston rod acting on a trapped volume with a pressure relied valve to recycle the trapped fluid to the hydraulic inlet |
-
2005
- 2005-06-03 DE DE200510025505 patent/DE102005025505A1/en not_active Withdrawn
Patent Citations (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2804052A (en) * | 1954-01-11 | 1957-08-27 | Tomkins Johnson Company | Cushioning structure for hydraulic cylinders |
US2853974A (en) * | 1955-10-31 | 1958-09-30 | Westinghouse Air Brake Co | Piston cushioning arrangement for cylinders |
US2923276A (en) * | 1955-12-12 | 1960-02-02 | Flick Reedy Corp | Head structure for a piston and cylinder device |
US2960068A (en) * | 1958-08-08 | 1960-11-15 | Logansport Machine Co Inc | Cylindrical cushion bushing |
DE6943766U (en) * | 1969-11-07 | 1970-03-26 | Montan Hydraulik Gmbh & Co Kg | HYDRAULIC CYLINDER WITH END POSITION DAMPING |
DE2424975B2 (en) * | 1974-05-22 | 1977-10-06 | Montan-Hydraulik Gmbh & Co Kg, 4755 Holzwickede | HYDRAULIC CYLINDER WITH END POSITION DAMPING |
DE2603041A1 (en) * | 1976-01-28 | 1977-08-04 | Licentia Gmbh | Hydraulically driven circuit breaker - has dampening system with non return valves mounted in region of working cylinder bore |
DE2619176A1 (en) * | 1976-04-30 | 1977-11-10 | Stabilus Gmbh | GAS SPRING WITH RELEASED EXTENSION FORCE WITH RETRACTED PISTON ROD |
FR2479389A1 (en) * | 1980-03-26 | 1981-10-02 | Komatsu Mfg Co Ltd | HYDRAULIC CYLINDER STROKE DAMPING DEVICE |
DE4322255C2 (en) * | 1993-07-05 | 1996-02-01 | Festo Kg | Damping device |
DE19754352B4 (en) * | 1996-12-06 | 2004-01-29 | Smc Corp. | Fluid pressure cylinder |
DE29812712U1 (en) * | 1998-05-14 | 1998-11-26 | Liebherr-Werk Bischofshofen Ges.M.B.H., Bischofshofen | End position damping for a piston-cylinder unit |
EP0974769A2 (en) * | 1998-07-22 | 2000-01-26 | Hainzl Industriesysteme Gesellschaft m.b.H. & Co. KG | Device for the braking of a piston in a hydraulic cylinder |
DE10161199A1 (en) * | 2000-12-20 | 2002-07-04 | Imi Norgren Gmbh | Servo cylinder with damping at end of piston travel has the damping duct in the piston and its corresponding recess in the cylinder end wall offset from the centre of the piston |
DE20315551U1 (en) * | 2003-10-07 | 2004-03-04 | Evesque, Christian | Compact damping system for hydraulic cylinder has a damping sleeve attached to the piston rod acting on a trapped volume with a pressure relied valve to recycle the trapped fluid to the hydraulic inlet |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2006539A2 (en) | 2007-06-19 | 2008-12-24 | Webasto AG | Reciprocating piston pump for transporting a liquid |
DE102007028059A1 (en) | 2007-06-19 | 2009-03-05 | Webasto Ag | Reciprocating pump for pumping a liquid |
DE102007028059B4 (en) * | 2007-06-19 | 2009-08-20 | Webasto Ag | Reciprocating pump for pumping a liquid |
US8342078B2 (en) | 2007-06-19 | 2013-01-01 | Webasto SE | Reciprocating-piston pump for feeding a liquid |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
R005 | Application deemed withdrawn due to failure to request examination |
Effective date: 20120605 |