EP0180510B1 - Hydraulische Kolbenpumpe mit zwangsläufig angetriebenen Einlassventilen - Google Patents

Hydraulische Kolbenpumpe mit zwangsläufig angetriebenen Einlassventilen Download PDF

Info

Publication number
EP0180510B1
EP0180510B1 EP19850402018 EP85402018A EP0180510B1 EP 0180510 B1 EP0180510 B1 EP 0180510B1 EP 19850402018 EP19850402018 EP 19850402018 EP 85402018 A EP85402018 A EP 85402018A EP 0180510 B1 EP0180510 B1 EP 0180510B1
Authority
EP
European Patent Office
Prior art keywords
cam
valve
piston
spring
urged
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
Application number
EP19850402018
Other languages
English (en)
French (fr)
Other versions
EP0180510A1 (de
Inventor
Louis Claude Porel
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.)
Hydro Rene Leduc SA
Original Assignee
Hydro Rene Leduc SA
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 Hydro Rene Leduc SA filed Critical Hydro Rene Leduc SA
Publication of EP0180510A1 publication Critical patent/EP0180510A1/de
Application granted granted Critical
Publication of EP0180510B1 publication Critical patent/EP0180510B1/de
Expired legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0042—Piston machines or pumps characterised by having positively-driven valving with specific kinematics of the distribution member
    • F04B7/0053—Piston machines or pumps characterised by having positively-driven valving with specific kinematics of the distribution member for reciprocating distribution members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B1/18—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders having self-acting distribution members, i.e. actuated by working fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/102—Disc valves
    • F04B53/1022—Disc valves having means for guiding the closure member axially

Definitions

  • the present invention relates to improvements in hydraulic piston pumps and controlled suction valves.
  • Hydraulic piston pumps generally comprise a plurality of reciprocating pistons by means of a cam; this cam can be connected to the drive shaft, the pistons sliding in cylinders hollowed out in the pump body, or the cam is fixed and the pistons slide in cylinders hollowed out in a rotating barrel driven by the shaft d 'training.
  • the cam can be of any suitable shape, for example an eccentric, the pistons being radial or a bias plate, the pistons then being parallel to the drive shaft of the pump.
  • the first drawback stems from the fact that the direction of rotation of the pump drive shaft must always be the same, without which suction and delivery can no longer take place.
  • French patent 2,394,692 it has been proposed in French patent 2,394,692 to place the front face of the bias plate, without the lunula, a plate which can pivot 180 °, this plate being itself provided with a lunula: it is then possible by a simple rotation of the plate on the front face of the bias plate to reverse the suction and delivery phases and therefore reverse the direction of rotation of the pump.
  • this rotation of the plate on the face of the bias plate cannot be done automatically and requires manual intervention each time.
  • the second drawback stems from the fact that the hydraulic liquids having a non-negligible compressibility at these high pressures (200 bars and beyond), it is necessary to angularly offset the start of the lunula relative to the line of greatest slope of the face of the bias plate so as to prevent the intake phase from starting before the liquid inside the piston has finished expanding. If such a precaution is not taken, the pressurized liquid flows back into the suction circuit, which lowers the efficiency of the pump.
  • the magnitude of this offset is a function of the speed of rotation of the pump and the compressibility rate of the fluid conveyed. The latter depends on the pressure, the temperature, the amount of air dissolved in the fluid etc.
  • the Applicant has replaced the supply system by means of a lunula and sliding pads with suction valves.
  • main patent No. 79 29037 (FR-A-2 470 266) a bias plate pump comprising for each piston an intake valve subjected to the action of two opposing springs: a first spring pushing it towards the closing and a second spring pushing it towards the opening, this second spring being associated with a cam linked in rotation to the drive shaft of the pump so that the force exerted by this second spring becomes substantially equal to that exerted in the opposite direction by the first to start of the suction phase.
  • n ° 80.09780 (FR-A-2 481 757) the cam is formed so as to be able to be placed in two positions offset from each other by 180 °, which allows to reverse the direction of pump rotation.
  • the pump according to the present invention is a hydraulic pump comprising at least one piston which moves back and forth, each piston being associated with a suction valve which is returned to the closed position by a return spring, characterized by the causes said return spring (16) to be associated with a plunger (15) actuated cyclically by a cam (21) driven by the drive shaft (1) of the pump; so that, when the pusher (15) is actuated by the cam (21) the action of the spring (16) on the valve (11) is canceled during the suction phase and restored at the end of said phase, which has the result that the valve (11) is free during this period and opens only if the suction pressure is greater than the residual pressure prevailing in the cylinder (6) associated with said valve.
  • FIG. 1 shows a hydraulic pump with axial pistons and bias plate.
  • This pump is constituted by a drive shaft 1 carrying a bias plate 2 on the front face 2a of which bear a plurality of pistons 3, each piston 3 resting against said front face 2a of the bias plate 2 by a sliding pad 4.
  • Each piston 3 is held in abutment on its shoe 4 by a spring 5 and moves in a cylinder 6.
  • Each cylinder 6 communicates by an orifice 7 with an intake chamber 8 which, itself, communicates with the reservoir 9 by a pipe 10.
  • Each orifice 7 is provided with a suction valve 11.
  • Each valve 11 has a rod 12 which slides freely in a bearing 13 and which projects into a bore 14 inside which a hollow piston 15 which can be pushed back can slide by a spring 16.
  • the rod 12 of the valve 11 penetrates inside the hollow piston 15 through an orifice 17 in which it slides.
  • the rod 12 of the valve 11 has a stop 18 which in FIG. 1 is constituted by a circlip and which in FIGS. 2 and 3 is schematically represented by a disc integral with the end of the rod 12.
  • a housing 19 in which is disposed, with a certain clearance, a ball 20 which bears against a cam 21 carried by a rod 22 driven by the shaft 1.
  • valve 11 is pushed at the end n of the suction phase in the closed position by a spring 16 which is determined so as to exert a forceful closing reminder; but that from the start of the suction phase, the effect of this return spring 16 is eliminated by the cam 21, the valve 11 then being a free valve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Claims (4)

1. Hydraulische Pumpe mit wenigstens einem hin- und herbewegten Kolben, wobei jedem Kolben ein Einlaßventil zugeordnet ist, welches durch eine Rückzugsfeder in seine Schließstellung zurückgeführt wird, dadurch gekennzeichnet, daß die genannte Rückzugsfeder (16) einem Stößel (15) zugeordnet ist, der von einer Kurvenscheibe (21) cyklisch betätigt wird, die von der Antriebswelle (1) der Pumpe derart angetrieben wird, daß beim Betätigen des Stößels (15) durch die Kurvenscheibe (21) die Wirkung der Feder (16) während der Saugphase aufgehoben und am Ende dieser Saugphase wieder hergestellt wird, mit der Folge, daß das Ventilverschlußstück (11) während dieser Periode frei ist und sich nur öffnet, wenn der Saugdruck höher ist als der Restdruck, der in Zylinder (6) herrscht, dem das Ventil zugeordnet ist.
2. Hydraulische Pumpe nach Anspruch 1, dadurch gekennzeichnet, daß das Einlaßventil (1) mit einer Stange (12) verbunden ist, die durch einen Anschlag (18) mit einem Hohlkolben (15) verbunden ist, in dessen Innerem sie gleiten kann, wobei der Hohlkolben (15) im Schließsinne durch die Rückzugsfeder (16) und im umgekehrten Sinne durch die Kurvenscheibe (21) derart zurückgedrückt wird, daß der Hohlkolben (15), wenn er nicht durch die Kurvenscheibe (21) zurückgedrückt wird, unter der Wirkung der Rückzugsfeder (16) auf die Stange (12) einen Zug ausübt, was das Schließen der Ventilklappe (11) zur Folge hat, während er die Feder (16) zusammendrückt und die Stange (12) des Ventilverschlußstückes (11) befreit, wenn er von der Kurvenscheibe (21) zurückgedrückt wird.
3. Hydraulische Pumpe nach Anspruch 2, bei welcher die Kurvenscheibe (21) mittels einer Kugel (20) auf den Kolben (15) wirkt, die mit Spiel in einer Ausnehmung (19) an demjenigen Ende des Kolbens (15) angeordnet ist, das dem Ende gegenüberliegt, gegen das sich die Feder (16) abstützt.
4. Hydraulische Pumpe nach einem der Ansprüche 1 bis 3, bei der die Kolben (3) der Pumpe durch eine schiefe Platte (2) hin- und herbewegt werden und die Kurvenscheibe (21) von einer Welle (22) getragen wird, die von der Motorwelle (1) durch Mittel angetrieben wird, die ein Versetzen der Kurvenscheibe (21) um 180° gegenüber der schiefen Platte (2) und damit eine Umkehrung der Drehrichtung der Pumpe gestatten.
EP19850402018 1984-10-19 1985-10-18 Hydraulische Kolbenpumpe mit zwangsläufig angetriebenen Einlassventilen Expired EP0180510B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8416051 1984-10-19
FR8416051A FR2572138B1 (fr) 1984-10-19 1984-10-19 Pompe hdraulique a pistons et a clapets d'aspiration commandes

Publications (2)

Publication Number Publication Date
EP0180510A1 EP0180510A1 (de) 1986-05-07
EP0180510B1 true EP0180510B1 (de) 1988-11-30

Family

ID=9308834

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850402018 Expired EP0180510B1 (de) 1984-10-19 1985-10-18 Hydraulische Kolbenpumpe mit zwangsläufig angetriebenen Einlassventilen

Country Status (3)

Country Link
EP (1) EP0180510B1 (de)
DE (1) DE3566569D1 (de)
FR (1) FR2572138B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19708922B4 (de) * 1996-03-13 2006-05-18 Volkswagen Ag Hydraulische Axialkolbenpumpe mit einem Gehäuse

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1015545A3 (fr) * 2003-05-28 2005-06-07 Waudoit Claude Albert Systeme de transformation d'energie a appareil volumetrique.
WO2014091266A1 (en) 2012-12-10 2014-06-19 Kongsberg Automotive Ab Unitary fluid flow apparatus for inflating and deflating a device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB581735A (en) * 1942-09-23 1946-10-23 Oliver Bevir Improvements in and relating to hydraulic pumps
US4486152A (en) * 1979-11-26 1984-12-04 Hydro Rene Leduc Pump with spring loaded valve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19708922B4 (de) * 1996-03-13 2006-05-18 Volkswagen Ag Hydraulische Axialkolbenpumpe mit einem Gehäuse

Also Published As

Publication number Publication date
FR2572138A1 (fr) 1986-04-25
DE3566569D1 (en) 1989-01-05
EP0180510A1 (de) 1986-05-07
FR2572138B1 (fr) 1987-01-23

Similar Documents

Publication Publication Date Title
EP1048849B1 (de) Flüssigkeitshochdruckpumpe
EP0082039B1 (de) Hydrostatische Kupplung
CA2090715A1 (fr) Perfectionnement aux pompes hydrauliques a pistons munis de clapet d'aspiration
FR2578307A1 (fr) Pompe a huile de graissage notamment pour la chaine d'une scie a moteur
FR2687434A1 (fr) Compresseur a haut rendement et a volume de reexpansion reduit.
EP0180510B1 (de) Hydraulische Kolbenpumpe mit zwangsläufig angetriebenen Einlassventilen
EP0449686B1 (de) Teleskopische bewegliche Ausrüstung zum Antrieb einer Verdrängungspumpe
FR2649163A1 (fr) Machine hydrostatique a deplacement volumetrique
EP0428192B1 (de) Stufenloses hydrostatisches Radialkolbengetriebe
EP0731886B1 (de) Schmiervorrichtung eines zusammenbaus von zwei mechanisch verbundenen teilen, bzw. kolben und pleuelstange
EP0449692B1 (de) Modulare Pumpe mit mehreren Auslässen, jeder versorgt durch eine Pumpeinheit
EP0052387B1 (de) Motor mit mindestens einem linearbewegten Kolben und einerTaumelscheibe
FR2711736A1 (fr) Dispositif d'injection de combustible liquide pour moteur Diesel.
EP0283348A1 (de) Hydraulische Pumpen
CH640310A5 (en) Hydraulic pump with a sprung valve
FR2749616A1 (fr) Pompe a haute pression pour tous liquides
FR2509386A1 (fr) Pompe a piston radial
FR2822199A1 (fr) Dispositif hydraulique du type pompe a pistons
FR2582738A1 (fr) Machine hydraulique a pistons axiaux a distributeur central et flottant pouvant fonctionner soit en moteur, soit en pompe
FR2981703A1 (fr) Pompe hydraulique radiale a excentricite et debit variables
FR2475129A1 (fr) Appareil de pompage a injection pour moteur a combustion interne
FR2520059A1 (fr) Pompe hydraulique a clapets de refoulement commandes
BE502392A (de)
EP0089296A1 (de) Hydraulische Axialkolbenpumpe mit Schrägscheibe und einer Einrichtung zum Selbstansaugen
FR2523655A1 (fr) Pompe hydraulique a pistons axiaux commandes par un plateau biais, munis de moyens d'autoamorcage

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE GB

17P Request for examination filed

Effective date: 19861027

17Q First examination report despatched

Effective date: 19871208

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE GB

REF Corresponds to:

Ref document number: 3566569

Country of ref document: DE

Date of ref document: 19890105

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19900925

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19911004

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19911030

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19921018

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19921018