EP0450156B1 - Protection device for a hydraulic jack piston rod - Google Patents

Protection device for a hydraulic jack piston rod Download PDF

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Publication number
EP0450156B1
EP0450156B1 EP90122461A EP90122461A EP0450156B1 EP 0450156 B1 EP0450156 B1 EP 0450156B1 EP 90122461 A EP90122461 A EP 90122461A EP 90122461 A EP90122461 A EP 90122461A EP 0450156 B1 EP0450156 B1 EP 0450156B1
Authority
EP
European Patent Office
Prior art keywords
piston rod
protective sleeve
slide ring
cylinder
guided
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
EP90122461A
Other languages
German (de)
French (fr)
Other versions
EP0450156A1 (en
Inventor
Mario Rieger
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.)
Dr Ing HCF Porsche AG
Original Assignee
Dr Ing HCF Porsche AG
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 Dr Ing HCF Porsche AG filed Critical Dr Ing HCF Porsche AG
Publication of EP0450156A1 publication Critical patent/EP0450156A1/en
Application granted granted Critical
Publication of EP0450156B1 publication Critical patent/EP0450156B1/en
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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2271—Actuators and supports therefor and protection therefor
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/24—Safety devices, e.g. for preventing overload
    • 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

Definitions

  • the invention relates to a protective device according to the preamble of claim 1.
  • a protective device for a hydraulic cylinder of a work vehicle which comprises a piston rod cover, which can be displaced accordingly with the piston according to the working movements of the hydraulic cylinder or the inward and outward movement of the piston rod.
  • a guide on the cylinder housing for displacement takes place via a flat guide on both sides of the cover designed as a half-shell.
  • Such a guided sliding cover is subject to a relatively high susceptibility to malfunction due to the robust operation of work vehicles, since even slight deformations of the cover due to external influences can lead to jamming and thus a function of the hydraulic cylinder is no longer fully guaranteed.
  • a protective device for a hydraulic cylinder which comprises two shell-like protective sleeves which are guided into one another and are guided to one another by means of an angular rail. Furthermore, a further guide for the inner shell is provided on the cylinder housing.
  • a protective cover for a working cylinder is known from the drawing by Hunger 10 673, which covers the cylinder housing up to a plane running through the central axis of the cylinder. The cover is guided on the cylinder housing by means of a narrow sliding piece.
  • the object of the invention is to provide an improved protective device for a piston rod of a hydraulic cylinder, which is robust and ensures protection even after exposure to external influences.
  • the main advantages achieved with the invention are that the shell-like protective sleeve is guided on a slide ring of the cylinder housing and special flat guides according to DE-A 37 31 734 can be omitted, so that even if the protective sleeve is deformed, there is no impediment to the function of the hydraulic cylinder .
  • the slide ring is preferably made of elastic plastic and is held on the cylinder housing by means of a tensioning band and is therefore easy to assemble and replace.
  • the protective sleeve can be freely moved on the slide ring in accordance with the working movements of the hydraulic cylinder. It is not subject to any particular tolerance, so that if the sleeve is damaged, the hydraulic cylinder is impaired and a protective function is guaranteed.
  • the protective device 1 for a hydraulic cylinder 2 essentially comprises a shell-like protective sleeve 4 which partially covers the piston rod 3 of the hydraulic cylinder .
  • the shell-like protective sleeve 4 is firmly connected to a holder 9, which in turn can be pivoted between legs 10 of the bearing eye 7 about a horizontal axis 11.
  • the protective sleeve 4 encloses an area of the cylinder housing 12 and the piston rod 3 exposed during working movements. It is mainly protected from above, i.e. against external influences acting in the direction of the arrow 14.
  • This slide ring 15 consists of elastic plastic and is clamped to the housing 12 by means of a tensioning band 16, as shown in FIG.
  • the sliding ring 15 has tangential bevels 17 on its circumference, which are designed to make the ring 15 flexible and to reduce the friction between the protective sleeve 4 and the sliding ring 15.
  • the shell-like protective sleeve 4 has a continuous slot 19 in the lower region 18, which forms a free space for the screw 20 of the tensioning strap 16 and for a pressure line 21 of the hydraulic cylinder 2.
  • the protective sleeve 4 slides on the slide ring 15 and holds the sensitive surface of the piston rod 3 against objects falling from above in the direction of the arrow 14, e.g. Stones and the like are protected over the entire work area.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Actuator (AREA)
  • Fluid-Damping Devices (AREA)
  • Component Parts Of Construction Machinery (AREA)

Abstract

A protective arrangement is described for a piston rod of an excavator hydraulic cylinder is arranged between a vehicle frame and a scraper blade to serve as a working cylinder for lifting and lowering. For protecting the exposed piston rod, a shell-type protective sleeve is supported by way of a stationary slide ring while resting on the latter, and encloses the piston rod from above in a protective manner during the working operation.

Description

Die Erfindung bezieht sich auf eine Schutzvorrichtung nach dem Oberbegriff des Anspruchs 1.The invention relates to a protective device according to the preamble of claim 1.

Aus der DE-A 37 31 734 ist eine Schutzvorrichtung für einen Hydraulikzylinder eines Arbeitsfahrzeuges bekannt, die eine Kolbenstangenabdeckung umfaßt, welche entsprechend der Arbeitsbewegungen des Hydraulikzylinders bzw. der Ein- und Ausfahrbewegung der Kolbenstange, mit dieser entsprechend verschiebbar ist. Eine Führung am Zylindergehäuse zum Verschieben erfolgt über eine Flachführung an beiden Seiten der als Halbschale ausgeführten Abdeckung. Eine solche geführte verschiebbare Abdeckung ist aufgrund des robusten Betriebs von Arbeitsfahrzeugen einer relativ großen Störanfälligkeit unterworfen, da schon geringe Verformungen der Abdeckung durch äußere Einflüsse zu einem Verklemmen führen können und damit eine Funktion des Hydraulikzylinders nicht mehr voll gewährleistet ist.From DE-A 37 31 734 a protective device for a hydraulic cylinder of a work vehicle is known, which comprises a piston rod cover, which can be displaced accordingly with the piston according to the working movements of the hydraulic cylinder or the inward and outward movement of the piston rod. A guide on the cylinder housing for displacement takes place via a flat guide on both sides of the cover designed as a half-shell. Such a guided sliding cover is subject to a relatively high susceptibility to malfunction due to the robust operation of work vehicles, since even slight deformations of the cover due to external influences can lead to jamming and thus a function of the hydraulic cylinder is no longer fully guaranteed.

Aus der GB-A-770 866 ist eine Schutzvorrichtung für einen Hydraulikzylinder bekannt, welche zwei schalenartige ineinander geführte Schutzhülsen umfaßt, die mittels einer winkelförmigen Schiene zueinander geführt sind. Des weiteren ist eine weitere Führung für die innenliegende Schale auf dem Zylindergehäuse vorgesehen. Aus der Zeichnung Fa. Hunger 10 673 ist eine Schutzabdeckung für einen Arbeitszylinder bekannt, welche das Zylindergehäuse bis zu einer durch die Mittenachse des Zylinders verlaufenden Ebene abdeckt. Eine Führung der Abdeckung auf dem Zylindergehäuse erfolgt mittels eines schmalen Gleitstückes.From GB-A-770 866 a protective device for a hydraulic cylinder is known which comprises two shell-like protective sleeves which are guided into one another and are guided to one another by means of an angular rail. Furthermore, a further guide for the inner shell is provided on the cylinder housing. A protective cover for a working cylinder is known from the drawing by Hunger 10 673, which covers the cylinder housing up to a plane running through the central axis of the cylinder. The cover is guided on the cylinder housing by means of a narrow sliding piece.

Aufgabe der Erfindung ist es, eine verbesserte Schutzvorrichtung für eine Kolbenstange eines Hydraulikzylinders zu schaffen, die robust ausgeführt ist und einen Schutz auch nach Einwirkung von äußeren Einflüssen gewährleistet.The object of the invention is to provide an improved protective device for a piston rod of a hydraulic cylinder, which is robust and ensures protection even after exposure to external influences.

Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale im Anspruch 1 gelöst.Weitere vorteilhafte Merkmale beinhalten die Unteransprüche.This object is achieved according to the invention by the characterizing features in claim 1. Further advantageous features include the subclaims.

Die mit der Erfindung hauptsächlich erzielten Vorteile bestehen darin, daß die schalenartige Schutzhülse auf einem Gleitring des Zylindergehäuses geführt ist und spezielle Flachführungen gemäß der DE-A 37 31 734 entfallen können, so daß auch bei einer Verformung der Schutzhülse keine Behinderung der Funktion des Hydraulikzylinders erfolgt. Der Gleitring ist vorzugsweise elastisch in Kunststoff ausgeführt und wird über ein Spannband am Zylindergehäuse gehalten und ist somit in einfacher Weise montier- und auswechselbar.The main advantages achieved with the invention are that the shell-like protective sleeve is guided on a slide ring of the cylinder housing and special flat guides according to DE-A 37 31 734 can be omitted, so that even if the protective sleeve is deformed, there is no impediment to the function of the hydraulic cylinder . The slide ring is preferably made of elastic plastic and is held on the cylinder housing by means of a tensioning band and is therefore easy to assemble and replace.

Die Schutzhülse ist entsprechend der Arbeitsbewegungen des Hydraulikzylinders auf dem Gleitring frei verschiebbar. Sie unterliegt keiner besonderen Toleranz, so daß bei einer Beschädigung der Hülse eine Beeinträchtigung des Hydraulikzylinders und eine Schutzfunktion gewährleistet bleibt.The protective sleeve can be freely moved on the slide ring in accordance with the working movements of the hydraulic cylinder. It is not subject to any particular tolerance, so that if the sleeve is damaged, the hydraulic cylinder is impaired and a protective function is guaranteed.

Eine Ausführung der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.
Es zeigen

Fig.1
eine Seitenansicht eines Hydraulikzylinders mit schalenartiger Schutzhülse,
Fig.2
eine Ansicht in Pfeilrichtung X auf einen am Zylindergehäuse gehaltenen Gleitring gesehen und
Fig.3
einen Schnitt nach der Linie III-III der Fig.1.
An embodiment of the invention is shown in the drawing and is described in more detail below.
Show it
Fig. 1
a side view of a hydraulic cylinder with a shell-like protective sleeve,
Fig. 2
seen a view in the direction of arrow X on a slide ring held on the cylinder housing and
Fig. 3
a section along the line III-III of Fig.1.

Die Schutzvorrichtung 1 für einen Hydraulikzylinder 2 umfaßt im wesentlichen ein die Kolbenstange 3 des Hydraulikzylinders teilweise abdeckende schalenartige Schutzhülse 4. Der Hydraulikzylinder 2 ist mit seinem einen gehäuseseitigen Lagerauge 5 am Fahrzeugaufbau 6 und mit seinem stangenseitigen Lagerauge 7 an einem Schild 8 oder dergleichen Arbeitsgerät gelenkig befestigt.The protective device 1 for a hydraulic cylinder 2 essentially comprises a shell-like protective sleeve 4 which partially covers the piston rod 3 of the hydraulic cylinder .

Die schalenartige Schutzhülse 4 ist mit einem Halter 9 fest verbunden, der wiederum zwischen Schenkeln 10 des Lagerauges 7 um eine horzontale Achse 11 schwenkbar ist.The shell-like protective sleeve 4 is firmly connected to a holder 9, which in turn can be pivoted between legs 10 of the bearing eye 7 about a horizontal axis 11.

Die Schutzhülse 4 umschließt einen Bereich des Zylindergehäuses 12 sowie die bei Arbeitsbewegungen freiliegende Kolbenstange 3. Sie wird hauptsächlich von oben geschützt, d.h. gegen in Pfeilrichtung 14 wirkende äußere Einflüsse.The protective sleeve 4 encloses an area of the cylinder housing 12 and the piston rod 3 exposed during working movements. It is mainly protected from above, i.e. against external influences acting in the direction of the arrow 14.

Zur gleitenden Abstützung der Schutzhülse 4 ist sie auf einem Gleitring 15 des Zylindergehäuses 12 geführt. Dieser Gleitring 15 besteht aus elastischem Kunststoff und wird über ein Spannband 16 am Gehäuse 12 festgespannt, wie Fig.3 näher zeigt.For the sliding support of the protective sleeve 4, it is guided on a slide ring 15 of the cylinder housing 12. This slide ring 15 consists of elastic plastic and is clamped to the housing 12 by means of a tensioning band 16, as shown in FIG.

Der Gleitring 15 weist an seinem Umfang tangentiale Abschrägungen 17 auf, die den Ring 15 flexibel gestalten und die Reibung zwischen der Schutzhülse 4 und dem Gleitring 15 vermindern sollen.The sliding ring 15 has tangential bevels 17 on its circumference, which are designed to make the ring 15 flexible and to reduce the friction between the protective sleeve 4 and the sliding ring 15.

Die schalenartige Schutzhülse 4 weist im unteren Bereich 18 einen durchgehenden Schlitz 19 auf, der einen Freiraum für die Schraube 20 des Spannbandes 16 sowie für eine Druckleitung 21 des Hydraulikzylinders 2 bildet.The shell-like protective sleeve 4 has a continuous slot 19 in the lower region 18, which forms a free space for the screw 20 of the tensioning strap 16 and for a pressure line 21 of the hydraulic cylinder 2.

Bei einem Aus- und Einfahren der Kolbenstange 3 in die Pfeilrichtungen 22 und 23 gleitet die Schutzhülse 4 auf dem Gleitring 15 und hält die empfindliche Oberfläche der Kolbenstange 3 gegen von oben in Pfeilrichtung 14 fallende Gegenstände, wie z.B. Steine und dergleichen über den gesamten Arbeitsbereich geschützt.When the piston rod 3 is extended and retracted in the arrow directions 22 and 23, the protective sleeve 4 slides on the slide ring 15 and holds the sensitive surface of the piston rod 3 against objects falling from above in the direction of the arrow 14, e.g. Stones and the like are protected over the entire work area.

Claims (3)

  1. A protection device for a piston rod (3) of a hydraulic cylinder (2) on an excavator, in particular for a hydraulic cylinder (2) arranged between a vehicle chassis (6) and a levelling plate (8) as a jack for lifting and lowering, wherein the piston rod (3) of the cylinder (2) is covered by a protective sleeve (4) guided on the cylinder (2) and the protective sleeve (4) is fixed at one end to the articulation eye (7) of the piston rod (3) and is guided at the other end on a fixed slide member, characterised in that the slide member is formed as a slide ring (15) surrounding the cylinder housing (12), the protective sleeve (4) being guided on the said slide ring (15) in a sliding manner, and the protective sleeve (4) surrounds the slide ring (15), leaving open a continuous longitudinal slot (19) provided in the lower region (18) as a free space for a screw (20) of a clamping band (16) holding the slide ring (15).
  2. A device according to claim 1, characterised in that the protective sleeve (4) is fixed to a support (9) mounted on the articulation eye (7) between arms (10) so as to be pivotable about a horizontal axis (11), the said articulation eye (7) being provided at the end of the piston rod.
  3. A device according to claim 1 or 2, characterised in that the slide ring (15) has tangential flats (17) distributed over the periphery thereof and having a smaller wall thickness (d) than the remaining wall of the slide ring (15).
EP90122461A 1990-03-30 1990-11-26 Protection device for a hydraulic jack piston rod Expired - Lifetime EP0450156B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4010225 1990-03-30
DE4010225A DE4010225A1 (en) 1990-03-30 1990-03-30 PROTECTIVE DEVICE FOR A PISTON ROD OF A HYDRAULIC CYLINDER

Publications (2)

Publication Number Publication Date
EP0450156A1 EP0450156A1 (en) 1991-10-09
EP0450156B1 true EP0450156B1 (en) 1996-03-27

Family

ID=6403399

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90122461A Expired - Lifetime EP0450156B1 (en) 1990-03-30 1990-11-26 Protection device for a hydraulic jack piston rod

Country Status (6)

Country Link
US (1) US5152351A (en)
EP (1) EP0450156B1 (en)
JP (1) JPH04222725A (en)
AT (1) ATE136082T1 (en)
DE (2) DE4010225A1 (en)
NO (1) NO175649C (en)

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US6843005B2 (en) * 2002-11-14 2005-01-18 Rockland, Inc. Grappling attachment for excavating machines and the like
US6659194B1 (en) * 2002-11-22 2003-12-09 Samuel C. Thompson Blade angle adjustment system
ITRM20030438A1 (en) * 2003-09-24 2005-03-25 Jolly Drive S R L PROTECTION DEVICE FROM MARINE VEGETATION
KR100723579B1 (en) * 2004-05-04 2007-05-31 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 Cylinder protective apparatus for preventing strange noise
DE102004030289A1 (en) * 2004-06-23 2006-01-12 Ina-Schaeffler Kg Protective element for a preassembled unit, in particular for a clamping device of a belt meander drive
JP4038197B2 (en) * 2004-07-01 2008-01-23 ヤンマー株式会社 Cylinder protection device
US7681657B2 (en) * 2004-12-09 2010-03-23 Deere & Company Debris guard
US7594466B2 (en) * 2007-01-12 2009-09-29 Rotobec Inc. Actuator with a protective sleeve for a piston
JP4759690B2 (en) * 2008-01-29 2011-08-31 ヤンマー建機株式会社 Swivel work vehicle
JP2009215698A (en) * 2008-03-06 2009-09-24 Yanmar Co Ltd Earth removal device of work vehicle
WO2010087792A1 (en) 2009-01-28 2010-08-05 Deere & Company Bucket cylinder debris guard
DE102011002158A1 (en) 2011-04-19 2012-10-25 Claas Selbstfahrende Erntemaschinen Gmbh Self-propelled harvester
AU2012388831B2 (en) * 2012-08-27 2017-10-12 Komatsu Forest Ab Method and protective arrangement for linear control and actuator means that are components of a tree harvester of a forestry machine
EP2933388B1 (en) * 2014-04-18 2020-11-11 Caterpillar Work Tools B. V. Hydraulic cylinder cover
CN104454776A (en) * 2014-11-25 2015-03-25 无锡市晶瑜冶金机械有限公司 Installation structure of horizontal moving oil cylinder in stepping furnace
CN104696313B (en) * 2015-03-13 2017-03-22 山东钢铁股份有限公司 Water film device of protective hydraulic cylinder and protection method thereof
CN106560565B (en) * 2016-01-08 2019-01-25 徐工集团工程机械股份有限公司 Underground carry scraper safety protection control method, device and system
CN108487364B (en) * 2018-03-13 2020-07-21 柳州柳工挖掘机有限公司 Oil cylinder protection mechanism of excavator bucket
PE20221248A1 (en) * 2019-10-25 2022-08-15 Chromeguard Pty Ltd A PROTECTION SYSTEM FOR HYDRAULIC CYLINDER RODS

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Also Published As

Publication number Publication date
NO911267D0 (en) 1991-03-27
DE4010225A1 (en) 1991-10-02
EP0450156A1 (en) 1991-10-09
NO175649B (en) 1994-08-01
US5152351A (en) 1992-10-06
NO175649C (en) 1994-11-09
ATE136082T1 (en) 1996-04-15
DE4010225C2 (en) 1993-04-15
DE59010249D1 (en) 1996-05-02
JPH04222725A (en) 1992-08-12
NO911267L (en) 1991-10-01

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