SE470138B

SE470138B - Hydraulic control device

Info

Publication number: SE470138B
Application number: SE8505731A
Authority: SE
Inventors: Gerald Lexen
Original assignee: Maschf Augsburg Nuernberg Ag
Priority date: 1984-12-22
Filing date: 1985-12-04
Publication date: 1993-11-15
Also published as: SE8505731D0; SE8505731L; DE3447166A1; DE3447166C2; FR2575239A1; FR2575239B1

Description

470 138 2 - realisering av ett förutbestämt oljetryck och oljeefterinmatning till den slutna arbetskretsen, - realisering av ett förutbestämt oljetryck utan oljeefterinmatning, och g - begränsning av det maximala oljetrycket. 470 138 2 - realization of a predetermined oil pressure and oil after-feed to the closed working circuit, - realization of a predetermined oil pressure without oil after-feed, and g - limitation of the maximum oil pressure.

I det följande skall styranordningen enligt uppfinningen närmare beskrivas med hänvisning till det på bifogade ritning visade exemplet på ett hydraulikschema.In the following, the control device according to the invention will be described in more detail with reference to the example of a hydraulic diagram shown in the accompanying drawing.

Den hydrauliska styranordningen 10 innefattar en styrventil 1 i form av en 4/3-vägsventil, en första arbetsanslutning X, en andra arbets- anslutning A, en tryckbehållaranslutning P för olje- och tryckinställning, en tankanslutning T för återledning av bortstyrd olja, en tryckbegränsningsventil 2, vars begränsningstryck är inställbart, en tryckinkopplingsventil 3, vars tryck företrädesvis likaledes är inställbart, samt flera ledningsgrenar och fyra backventiler 4, 5, 6, 7 i de sistnämnda. Dessa backventiler är alla uppbyggda på samma sätt.The hydraulic control device 10 comprises a control valve 1 in the form of a 4/3-way valve, a first working connection X, a second working connection A, a pressure vessel connection P for oil and pressure setting, a tank connection T for returning discharged oil, a pressure relief valve 2, the limiting pressure of which is adjustable, a pressure switch-on valve 3, the pressure of which is preferably also adjustable, and several conduit branches and four non-return valves 4, 5, 6, 7 in the latter. These non-return valves are all built in the same way.

Styrventilen 1 har fyra anslutningar. På den ena sidan är tryck- behållaranslutningen P och tankanslutningen T, på den andra sidan är en, i en första ledningsväg ingående, till tryckinkopplingsventilen 3 ledande lednings- gren 11 och till första arbetsanslutning X ledande ledníngsgren 16, utgörande en tredje ledningsväg, anslutna. I den sistnämnda är endast den till arbetsan- slutningen X genomsläppliga backventilen 4 anordnad.The control valve 1 has four connections. On the one hand, the pressure vessel connection P and the tank connection T, on the other side, a conduit branch 11 leading to the pressure connection valve 3 leading to the pressure connection valve 3 and to the first working connection X conducting conduit branch 16, constituting a third conduit, are connected. In the latter, only the non-return valve 4 which is permeable to the working connection X is arranged.

Tryckinkopplingsventilen 3 har till uppgift att hålla det inställda trycket vid den första arbetsanslutningen X. Vid utgången från tryckinkopp- lingsventilen 3 är en, i en första ledningsväg ingående, till den andra arbetsanslutningen A ledande ledníngsgren 12 ansluten, över vilken olja med motsvarande tryck finns i beredskap.The function of the pressure connection valve 3 is to maintain the set pressure at the first working connection X. At the outlet from the pressure connection valve 3, a conduit branch 12 leading to the second working connection A is connected, over which oil with corresponding pressure is present in preparedness.

Från ledningsgrenen ll grenar sig före tryckinkopplingsventilen 3 en i en andra ledningsväg ingående ledníngsgren 19, som uppvisar en till ingången på tryckbegränsningsventilen 2 ledande och en endast i riktning mot den sistnämnda genomsläpplig backventil 5. Från utgången på tryckbegräns- ningsventilen 2 leder en, i en andra ledningsväg ingående, ledníngsgren 18 till tankanslutningen T. Från ledningsgrenen 16 grenar sig strömningsmässigt efter backventilen 4 en ledníngsgren 15, utgörande en fjärde ledningsväg, vilken leder till den mellan backventilen 5 och tryckbegränsningsventilen 2 förlöpande delen av ledningsgrenen 19. Från ledningsgrenen 18 går en till ledningsgrenen 12 förande ledníngsgren 13, 14, i vilken en endast i riktning 3 470 138 mot arbetsanslutningen A genomsläpplig backventil 6 är anordnad. Mellan ledningsgrenen 13, 14 och ledningsgrenen 15 är anordnad en ledningsgren 17, utgörande en femte ledningsväg med en endast i riktning mot arbetsanslut- ningen X genomsläpplig backventil 7.From the line branch 11, a line branch 19 included in a second line path branches off in front of the pressure connection valve 3, which has one leading to the inlet of the pressure limit valve 2 and one only in the direction of the latter permeable non-return valve 5. From the outlet of the pressure limit valve 2 second line path included, line branch 18 to the tank connection T. From the line branch 16 a line branch 15, flowing after the non-return valve 4, forms a fourth line path, which leads to the part of the line branch 19 extending between the non-return valve 5 and the pressure relief valve 2. line branch 13, 14 leading the line branch 12, in which a non-return valve 6 which can only be passed in the direction 3 470 138 towards the working connection A is arranged. Between the line branch 13, 14 and the line branch 15 a line branch 17 is arranged, constituting a fifth line path with a non-return valve 7 which can only be passed in the direction of the working connection X.

Under drift befinner sig styrventilen 1 normalt i sin visade, icke påverkade andra styrställning 0, alltså i det så kallade cirkulationsläget, i vilket dels anslutningarna P och T i styranordningen är kortslutna, dels trycken i den första arbetsanslutningen X och andra arbetsanslutningen A hålles konstanta.During operation, the control valve 1 is normally in its shown, unaffected second control position 0, i.e. in the so-called circulation position, in which both the connections P and T in the control device are short-circuited, and the pressures in the first working connection X and the second working connection A are kept constant.

Om styrventilen 1 elektromagnetiskt kopplas till sin första ge- nomkopplings-styrställning a, sâ hålles i den första arbetsanslutningen X det med hjälp av tryckinkopplingsventilen 3 inställda trycket över lednings- grenarna 12, 13, 17, 15 och 16. Överflödigt tryckmedium bortstyres till arbetsanslutningen A tills det av tryckbegränsningsventilen 2 förutbestämda trycket är uppnått. Därvid är backventilerna 4, 5 och 6 slutna, backventilen 7 däremot öppen. Så snart det maximalt tillåtliga, av tryckbegränsningsventilen 2 genom dess inställning förutbestämda trycket uppnås i den andra arbets- anslutningen A, öppnar tryckbegränsningsventilen 2 och olja strömmar över ledningsgrenen 18 till tankanslutningen T och därifrån in i en icke visad trycklös tank.If the control valve 1 is electromagnetically connected to its first feed-through control position a, then in the first working connection X the pressure set by means of the pressure switch-on valve 3 over the line branches 12, 13, 17, 15 and 16 is maintained. Excess pressure medium is directed to the working connection A until the pressure predetermined by the pressure relief valve 2 is reached. The non-return valves 4, 5 and 6 are closed, the non-return valve 7, on the other hand, is open. As soon as the maximum permissible pressure, determined by the pressure relief valve 2 by its setting, is reached in the second working connection A, the pressure relief valve 2 opens and oil flows over the line branch 18 to the tank connection T and thence into a pressureless tank (not shown).

Om styrventilen 1 elektromagnetiskt kopplas till sin tredje ge- nomkopplings-styrställning b, så kan icke någon olja mera strömma till den andra arbetsanslutningen A från tryckbehållaranslutningen P. Dock upprätt- hålles det externt tillströmmande trycket i arbetsanslutningen A på grund av att backventilerna 5 och 6 är slutna. Dessutom hålles trycket i den första arbetsanslutningen X konstant, nämligen med hjälp av tryckbegränsnings- ventilen 2 över ledningsgrenen 15 och den uppströms om backventilen 5 belägna delen av ledningsgrenen 19. Den från anslutningen P inmatade, men överflödiga oljan bortstyres av tryckbegränsningsventilen 2 över lednings- grenen 18.If the control valve 1 is electromagnetically connected to its third through-going control position b, then no more oil can flow to the second working connection A from the pressure vessel connection P. However, the externally inflowing pressure is maintained in the working connection A due to the non-return valves 5 and 6 are closed. In addition, the pressure in the first working connection X is kept constant, namely by means of the pressure relief valve 2 over the line branch 15 and the part of the line branch 19 located upstream of the non-return valve 5, but the excess oil fed in from the connection P is controlled by the pressure relief valve 2 over the line branch 18.

Samtliga ventiler 1, 2, 3 och backventiler ll, 5, 6, 7 och lednings- grenar 11, 12, 13, lll, 15, 16, 17, 18, 19 är sammanförda i ett enda styrblock, som i ritningen symboliserats medelst en punkt-streckad inramning och som på utsidan uppvisar anslutningarna X, A, P, T.All valves 1, 2, 3 and non-return valves 11, 5, 6, 7 and conduit branches 11, 12, 13, 11, 15, 16, 17, 18, 19 are combined in a single control block, which in the drawing is symbolized by a dotted line framing and which on the outside have the connections X, A, P, T.

Detta styrblock kan i ett fordon med hydrostatisk drift med återvändningsanordning för bromsenergi användas till matning av ifråga- varande hydraulikenheter.This control block can be used in a vehicle with hydrostatic operation with a brake energy return device for feeding the hydraulic units in question.

Claims

470 138 a PATENTKRAV

Hydraulic control device (10) with a first working connection (X), a second working connection (A), a pressure vessel connection (P) and a tank connection (T), a control valve (1) in the form of an ÅIIB road valve for control of the medium flow from and to said connections (X, A, P, T), a pressure relief valve (2), wherein the control valve (1) can assume a first control position (a), in which the pressure vessel connection (P) is via line paths connected to at least one of the second connections, a second control position (0) and a third control position (b), in which in relation to the first-mentioned control position (a) the connections located on the output side are exchanged, characterized in that a pressure connection valve (3 ) is located in a first line path (11, 12) from the control valve (1) to the second working connection (A), that the pressure relief valve (2) and in terms of flow thereon a non-return valve (5) is arranged, which is only permeable in the direction against the latter, in a second line path (19, 18), which is branched from the first line path (II) before the pressure connection valve (3) and which leads to the tank connection (T), that in a third line path (16) between the control valve (1) and the first working connection - a non-return valve (4) is provided, which is permeable only in the direction of the latter, that in terms of flow after the latter, a fourth conduit path (15) is provided from the line path (16), which leads to the one between the non-return valve (5). ) and the pressure relief valve (2) located part of the line branch (19), that from the line branch (18) leading downwards at the pressure limit valve (2) is arranged a line branch (13, III) leading to the first line branch (l2) with only a non-return valve (6) which can be passed in the direction of the working connection (A), that between the branch branches (13, ll! and 15) is arranged a fifth line branch (17) with a non-return valve (7) permeable in the direction of the working connection (X), and that via these line paths and valves by means of the control valve (1) a) in the first control position (a), the pressure is maintained in the working connection (X) by means of the pressure connection valve (3), while excess pressure medium is fed to the working connection (A), until the pressure predetermined in the pressure limiting valve (2) is reached, and that it is then controlled from the latter to the tank connection (T), b) in whose second control position (0), the connections (P and T) are short-circuited, and p 470 138 c) in whose third control position (b), the connections (P and X) are connected to each other and the pressure at the connection (X) is held by means of the pressure relief valve (2).

Control device according to Claim 1, characterized in that the control valve (1) assumes its second control position (0) in the unaffected state.

Control device according to Claim 1 or 2, characterized in that the control valve (1) can be connected by means of a level sensor. 14-.

Control device according to one of Claims 1 to 3, characterized in that the pressure in the pressure switch-on valve (3) and / or the pressure in the pressure relief valve (2) is adjustable.

Control device according to one of Claims 1 to 4, characterized in that the pressure switch-on valve (3) and / or the pressure relief valve (2) can be electromagnetically actuated.

Control device according to one of Claims 1 to 5, characterized in that all valves (1, 2, 3) and non-return valves (4, 5, 6, 7) and conduit branches are combined in a single control block, which on the outside contains the two working connections (X, A), the pressure vessel connection (P) and the tank connection (T).