NO165460B

NO165460B - DOUBLE-EFFECTING HYDRAULIC CYLINDER.

Info

Publication number: NO165460B
Application number: NO882970A
Authority: NO
Inventors: Jonas Byberg
Original assignee: Jonas Byberg
Priority date: 1988-07-04
Filing date: 1988-07-04
Publication date: 1990-11-05
Also published as: NO882970D0; NO882970L; NO165460C

Description

Foreliggende oppfinnelse vedrører en dobbeltvirkende hydrau- The present invention relates to a double-acting hydraulic

lisk sylinder for anvendelse i jordbruk, anlegg og industri, omfattende et sylinderør med et deri aksialt forskyvbart stempel med en tilkoplet stempelstang. ical cylinder for use in agriculture, construction and industry, comprising a cylinder tube with an axially displaceable piston therein with a connected piston rod.

I jordbruket blir slike dobbeltvirkende hydrauliske sylindre In agriculture, such double-acting hydraulic cylinders are used

ofte benyttet som toppstag i det tradisjonelle trepunkts- often used as a top brace in the traditional three-point

oppheng mellom traktor og redskap. Et slikt dobbeltvirkende hydraulisk drevet toppstag tjener i en slik forbindelse til justering av redskapets ,v»inkel i forhold til traktoren. Bruk av slike hydrauliske sylindre i jordloruket s"bm koplingsstag mellom traktor og redskap har.blitt aktualisert i de senere år, særlig i forbindelse med det nye, såkalte triangel-til-koplingssystem som er i ferd med å arbeide seg inn på mar- suspension between tractor and implement. Such a double-acting hydraulically driven top link serves in such a connection to adjust the implement's angle in relation to the tractor. The use of such hydraulic cylinders in the earthmoving s"bm coupling rod between tractor and implement has become actualized in recent years, particularly in connection with the new, so-called triangle-to-coupling system, which is in the process of working its way onto the market.

kedet som en standard koplingsenhet. bored as a standard coupling unit.

På anlegg og i industri tjener slike dobbeltvirkende hydrauliske sylindre som bevegelses-/forskyvningsmekanismer for å iverksette relative bevegelser mellom for eksempel en verk-tøys- /redskaps- /maskindeler . On construction sites and in industry, such double-acting hydraulic cylinders serve as movement/displacement mechanisms to implement relative movements between, for example, a tool/equipment/machine part.

En alvorlig ulempe ved tradisjonelle dobbeltvirkende hydrauliske sylindre av den innledningsvis angitte art, består i at de har en forholdsvis stor innbyggingslengde i forhold til den oppnådde slaglengde, hvilket resulterer i sterkt be- grenset fleksibilitet. Dette forhold e»rrspesielt ugunstig i tilknytning til nevnte triangel-tilkopjlihgssystem. Konven-sjonelle sylindres begrensede slaglengdé«kån ikke økes uten derved automatisk å øke innbyggingslengdénnmotsvarende. Ved begrensede plassforhold ved innbyggingssiedet er man derfor nødsaget til å greie seg med utilstrekkteliguslaglengde, hvilket kan gi seg utslag i for eksemped;utilfredsstillende forskyvning av en bevegelig komponent): il forhold til en annen, eller man må erstatte den hydraadlsk-é sylinder med en annen mekanisme som ikke har førstnevntescøvrige fordeler. A serious disadvantage of traditional double-acting hydraulic cylinders of the kind indicated at the outset is that they have a relatively large installation length in relation to the achieved stroke length, which results in severely limited flexibility. This situation is especially unfavorable in connection with the aforementioned triangle connection system. Conventional cylinders' limited stroke length cannot be increased without thereby automatically increasing the built-in length accordingly. In the case of limited space at the installation site, one is therefore forced to make do with insufficient log length, which can result in, for example, unsatisfactory displacement of one moving component) in relation to another, or one must replace the hydraadlsk-é cylinder with a other mechanism that does not have the advantages of the former.

I overensstemmelse med foreliggende oppjfinnelse er det føl-gelig tatt sikte på å skaffe tilveie em dobbeltvirkende hydraulisk sylinder av den innledningsvis angitte art hvor det ved samme innbyggingslengde som farren .tradisjonell •• sylinder kan oppnås i hovedsak dobbelt?: så,, stor slaglengde som denne. In accordance with the present invention, the aim is therefore to provide a double-acting hydraulic cylinder of the type indicated at the outset, where, with the same installation length as the far more traditional •• cylinder, essentially twice as much stroke can be achieved as this.

Dette formål kan oppnås ved å utforme1sylinderen som angitt i de etterfølgende patentkrav. This purpose can be achieved by designing the cylinder as stated in the subsequent patent claims.

En slik dobbeltvirkende hydraulisk syjLinriiér kan erstatte tradisjonelle sylindre overalt hvor dett stilles krav til stor slaglengde kombinert med liten irmibiyggingslengde. Such a double-acting hydraulic cylinder can replace traditional cylinders wherever there is a requirement for a large stroke length combined with a short extension length.

Ved en dobbeltvirkende hydraulisk sylind-ér ifølge oppfinnelsen, omsluttes sylinderrøret med klariirgg av: et ytre sylin-derrør, slik at det mellom sylinderrøren^cdannes en ringformet spalte, hvori er forskyvbart lageret .et andre stempel som er koplet til en rørformet stempelstang< som likeledes omgir det indre sylinderrør med klaringiog ;som kan ha et utvendig festeøre. Det ordinære stempels som. er anordnet i det indre sylinderrør, kan. ved stempelstamgenden ha et til-svarende festeøre. De to stemplers trykklammere henholdsvis returkammére er innbyrdes forbundet, slik.at trykkolje- tilførsel til trykkammerne avstedkommer samtidig utskyvning av de to stempler, mens økt oljetrykk i returkammerne iverk-setter samtidig inntrekking av stemplene. Man får herved dobbelt så stor slaglengde som ved en tradisjonell dobbeltvirkende hydraulisk sylinder med samme innbyggingslengde. In the case of a double-acting hydraulic cylinder according to the invention, the cylinder tube is enclosed with clear water by: an outer cylinder tube, so that an annular gap is formed between the cylinder tubes, in which the bearing is displaceable, a second piston which is connected to a tubular piston rod, which likewise, it surrounds the inner cylinder tube with clearance, which may have an external attachment ear. The ordinary is stamped as. is arranged in the inner cylinder tube, can. at the end of the piston rod have a corresponding attachment ear. The two pistons' pressure clamps and return chambers are interconnected, so that the supply of pressure oil to the pressure chambers results in simultaneous extension of the two pistons, while increased oil pressure in the return chambers initiates simultaneous retraction of the pistons. This gives you twice the stroke length as with a traditional double-acting hydraulic cylinder with the same built-in length.

Et utførelseseksempel av en dobbeltvirkende hyraulisk sylinder ifølge oppfinnelsen forklares nærmere i det etterfølgen-de under henvisning til medfølgende tegninger, hvor: Fig. 1 i sideriss/aksialsnitt viser sylinderen i sammen-skjøvet stilling; An embodiment of a double-acting hyraulic cylinder according to the invention is explained in more detail below with reference to accompanying drawings, where: Fig. 1 in side view/axial section shows the cylinder in a collapsed position;

Fig. 2 viser samme i maksimalt utskjøvet tilstand. Fig. 2 shows the same in the maximally extended state.

Den i figurene viste dobbeltvirkende hydrauliske sylinder omfatter på kjent måte et (indre) sylinderrør 1 med et deri forskyvbart lagret stempel 2 med en tilkoplet stempelstang 3 hvis frie ende bærer et utvendig festeøre 4. Sylinderrøret 1 har en påskrudd endegavl 5. Så langt er sylinderkonstruk-sjonen 1-5 kjent. The double-acting hydraulic cylinder shown in the figures comprises, in a known manner, an (inner) cylinder tube 1 with a displaceably stored therein piston 2 with a connected piston rod 3, the free end of which carries an external fastening ear 4. The cylinder tube 1 has a screwed-on end end 5. So far, the cylinder construction is -tion 1-5 known.

Sylinderrøret 1 omsluttes konsentrisk av et ytre sylinderrør 6 hvis indre diameter er vesentlig .større enn det indre sylinderrørs 1 ytre diameter, slik at det mellom sylinder-rørenes 1, 6 motstående mantelflater dannes et koaksialt ringrom 7, som aksialt strekker seg over en betydelig del av The cylinder tube 1 is concentrically enclosed by an outer cylinder tube 6 whose inner diameter is substantially larger than the outer diameter of the inner cylinder tube 1, so that between the opposite mantle surfaces of the cylinder tubes 1, 6 a coaxial annulus 7 is formed, which axially extends over a considerable part of

det indre sylinderrørs 1 lengdeutstrekning. the inner cylinder tube 1 longitudinal extent.

I ringrommet 7 mellom sylinderrørene 1, 6 er forskyvbart lagret et andre, ringformet stempel 8, som er tilkoplet en rørformet stempelstang 9 hvis frie ende bærer et utvendig festeøre 10. Den rørformede stempelstang 9 omgir likeledes det indre sylinderrør 1 med klaring, slik at det mellom dem dannes en ringformet spalte 11. In the annular space 7 between the cylinder tubes 1, 6, a second, ring-shaped piston 8 is displaceably stored, which is connected to a tubular piston rod 9, the free end of which carries an external fastening ear 10. The tubular piston rod 9 likewise surrounds the inner cylinder tube 1 with clearance, so that an annular gap 11 is formed between them.

Det ytre sylinderrør 6 er forsynt med en.påskrudd endegavl 5'.The outer cylinder tube 6 is provided with a screwed-on end plate 5'.

Det indre sylinderrørs 1 returkammer 12. oggdet ytre sylin-derrørs 6 returkammer 13 er utvendig, viaarør, forbundet med hverandre til felles oljeforsyning. Det_imdare sylinderrørs 1 trykkammer 14 og det ytre sy/linderrørs 6.itrykkammer 15 er innvendig forbundet med hverandre via dénnringformede spalte 11 mellom det indre sylinderrør 1 og dettaadre stempels 8 rørformede stempelstang 9. The return chamber 12 of the inner cylinder tube 1 and the return chamber 13 of the outer cylinder tube 6 are connected externally, via pipes, to each other for a common oil supply. The pressure chamber 14 of the inner cylinder tube 1 and the pressure chamber 15 of the outer cylinder tube 6 are internally connected to each other via the annular gap 11 between the inner cylinder tube 1 and the tubular piston rod 9 of the inner cylinder tube 8.

Når olje ledes inn i det ytre trykkammerr155ved den dobbeltvirkende sylinders sammenskjøvne stillinggifølge fig. 1, utøves et trykk på nevnte andre, ytre ringstempels 8 venstre gavlflate, hvorved stemplet 8 sammen meddsin rørformede stempelstang 9 forskyves mot høyre mot dénni fig. 2 viste, utskjøvne stilling. Samtidig f orplanter-:o<i"jétrykket seg via ringspalten 11 til det indre trykkammer-144 og påvirker det indre stempels 2 høyre gavlside, slik aM' i stemplet 2 sammen med sin stempelstang 3 forskyves mot venstre mot den i fig. When oil is led into the outer pressure chamber 155 by the double-acting cylinder's pushed together position according to fig. 1, a pressure is exerted on the left end face of said second, outer ring piston 8, whereby the piston 8 together with its tubular piston rod 9 is displaced to the right towards the fig. 2 shown, extended position. At the same time, the propellant pressure travels via the annular gap 11 to the inner pressure chamber 144 and affects the right end face of the inner piston 2, so that aM' in the piston 2 together with its piston rod 3 is displaced to the left towards that in fig.

2 viste, utskjøvne stilling., 2 shown, extended position.,

Det fremgår herav at den dobbeltvirkendéehydrauliske sylinders to stempler 2, 8 ved utskyvning forskyves i motsatte retninger, slik at det oppnås praktisk .ta-it dobbelt slaglengde ved samme innbyggingslengde som vedcen tradisjonell sylinder med halvparten så stor slaglengde^Da utskyvningen av de to stempler 2, 8 skjer samtidig veddsylinderens for-lengelse, spares blant annet tid ved håndteringen. It appears from this that the double-acting hydraulic cylinder's two pistons 2, 8 are displaced in opposite directions when extended, so that practically double the stroke is achieved at the same installation length as in a traditional cylinder with half the stroke. As the extension of the two pistons 2 , 8 the extension of the bet cylinder takes place at the same time, saving time during handling, among other things.

Returolje fra det indre returkammer 12 oggdet ytre returkammer 13 går til felles drenering. Ved^returslag utøves et felles oljetrykk i det indre- returkammerr12 og det ytre returkammer 13, slik at stemplene 2, 8 skyves mot hverandre til den i fig. 1 viste stilling. Return oil from the inner return chamber 12 and the outer return chamber 13 goes to a common drain. During the return stroke, a common oil pressure is exerted in the inner return chamber 12 and the outer return chamber 13, so that the pistons 2, 8 are pushed against each other until the one in fig. 1 displayed position.

Den dobbeltvirkende hydrauliske sylinder ifølge oppfinnelsen har således meget lang slaglengde i forhold til innbyggings-lengden og er kompakt og enkel i konstruksjon. The double-acting hydraulic cylinder according to the invention thus has a very long stroke in relation to the built-in length and is compact and simple in construction.

Claims

1. Double-acting hydraulic cylinder for use in agriculture, construction and industry, comprising a first cylinder tube (1) with an axially displaceable first piston (2) therein with a first piston rod (3) connected thereto, the free end of which can carry an external attachment ear (4), characterized in that said first cylinder tube (1) is concentrically enclosed by a second cylinder tube (6), whose inner diameter is larger than the first cylinder tube's (1) outer diameter, so that between the two coaxial cylinder tubes (1, 6) a continuous annular space (7) is formed in which a second, annular piston (8) is stored axially displaceably, which is connected to a second, tubular piston rod (9) whose free end can carry an external fastening ear (10), and that a connection has been established between the pressure chambers (14, 15) of the first cylinder tube (1) and the second cylinder tube (6) and between their return chambers (12, 13), so that simultaneous extension and retraction of the two pistons (2, 8) is ensured.

2. Double-acting hydraulic cylinder as stated in claim 1, characterized in that the inner jacket surface of the second, annular piston (8) tubular piston rod (9) is located at a radial distance from the outer jacket surface of the first cylinder tube (1), so that a axially extending, annular gap (11) which creates an internal connection between the pressure chamber (14) of the first cylinder tube (1) and the pressure chamber (15) of the second cylinder tube (6).

3. Double-acting hydraulic cylinder as stated in claim 1 or 2, characterized in that the return chamber (12) of the first cylinder tube (1) and the return chamber (13) of the second cylinder tube (6) are externally, via pipes, connected to each other for a common oil supply.