DK145986B - HYDRAULIC STEERING SYSTEM FOR A SERVOMOTOR, PARTICULAR FOR STEERING - Google Patents
HYDRAULIC STEERING SYSTEM FOR A SERVOMOTOR, PARTICULAR FOR STEERING Download PDFInfo
- Publication number
- DK145986B DK145986B DK362778AA DK362778A DK145986B DK 145986 B DK145986 B DK 145986B DK 362778A A DK362778A A DK 362778AA DK 362778 A DK362778 A DK 362778A DK 145986 B DK145986 B DK 145986B
- Authority
- DK
- Denmark
- Prior art keywords
- control
- connection
- pressure
- valve
- pump
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/08—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of steering valve used
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/09—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by means for actuating valves
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Steering Mechanism (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
- Fluid-Pressure Circuits (AREA)
Description
145986145986
Opfindelsen angår et hydraulisk styresystem til en servomotor, især til styring af køretøjer, med en styrekreds, som har en mængdeindstillingsanordning med en pumpetilslutning, en tanktilslutning og to styretilslutninger, samt to styreventi-5 ler, som hver er indkoblet mellem en styretilslutning og servomotorens ene side, og med en arbejdskreds, som har en trykreguleringsanordning med en pumpetilslutning, en tanktilslutning og to arbejdstilslutninger for frem- og tilbageløbet i form af en kraftsammenligner, som holder trykket på en 10 arbejdstilslutning lig med trykket på en styretilslutning, og to hovedventiler, som hver er indkoblet mellem en arbejdstilslutning og servomotorens ene side, hvorved styre- og hovedventilerne har et af det på disse optrædende trykfald afhængigt åbningstværsnit, hver hovedventil er forsynet med 15 et tilbagestillingselement, som under tvang åbner hovedventilen under indflydelse af trykket i en servomotorens anden side anbragt gren, og trykreguleringsanordningen har to trykkamre, som vedvarende er forbundet med hver sin styretilslutning.The invention relates to a hydraulic control system for a servomotor, particularly for vehicle control, with a control circuit having a quantity adjustment device with a pump connection, a tank connection and two control connections, as well as two control valves, each connected between a control connection and the servomotor one. side, and with a working circuit having a pressure regulating device with a pump connection, a tank connection and two working connections for the return and return in the form of a force comparator, which maintains the pressure of a working connection equal to the pressure of a control connection, and two main valves, which each is connected between a working connection and one side of the servomotor, whereby the control and main valves have one of the opening cross-sections dependent on these pressure drops, each main valve is provided with a reset element which forcibly opens the main valve under the influence of the pressure on the other side of the servomotor positioned branch, and pressure regulator none has two pressure chambers, which are permanently connected to each control connection.
20 En kendt styreanordning af denne art (DE-AS 23 05 798) har henholdsvis for styrekredsen og for arbejdskredsen en pumpe med fast forsyningsmængde. Ved hjælp af mængdeindstillingsanordningen forudbestemmes en trykvæskemængde i styrekredsen. Trykforholdene i styrekredsen overføres ved hjælp af 25 trykreguleringsanordningen til arbejdskredsen, således at 2 14598$ der i denne strømmer en med styrekredsmængden proportional arbejdskredsmængde. For at spare pumpeydelse er såvel ved mængdeindstillingsanordningen som ved trykreguleringsanordningen i neutralstillingen pumpetilslutningen forbundet med 5 tanktilslutningen; i det mindste ved trykreguleringsanordningen bortledes også uden for neutralstillingen overflødig olie til tanken.20 A known control device of this kind (DE-AS 23 05 798) has a fixed supply pump for the control circuit and for the working circuit respectively. By means of the quantity adjustment device, a quantity of pressure fluid is predetermined in the control circuit. The pressure conditions in the control circuit are transmitted by means of the pressure control device to the working circuit, so that $ 2 14598 there flows a working circuit proportional to the control circuit quantity. In order to save pump performance, both the quantity adjustment device and the pressure control device in the neutral position, the pump connection is connected to the tank connection; at least at the pressure control device, excess oil is also discharged to the tank outside the neutral position.
Man kender endvidere en styreanordning, ved hvilken en enkelt pumpe over en prioritetsventil forsyner en styringen 10 tjenende arbejdskreds, som har en mængdeindstillingsanordning og en umiddelbart med denne forbundet servomotor, og en tillægskreds. Prioritetsventilen styres på en sådan måde af trykfaldet over en med mængdeindstillingsanordningens indstilling foranderlig blænde, som er indkoblet mellem pumpetilslut-15 ningen og en mængdemåleanordning, at arbejdskredsen fortrinsvis modtager den til enhver tid krævede trykvæskemængde, men at overskudsmængden står til rådighed for tillægskredsen.There is also known a control device in which a single pump over a priority valve supplies a control circuit serving a control 10 having a quantity setting device and a servo motor directly connected to it, and an auxiliary circuit. The priority valve is controlled in such a manner by the pressure drop over an aperture variable with the setting of the quantity setting device, which is coupled between the pump connection and a quantity measuring device, that the working circuit preferably receives the required pressure fluid quantity at all times, but that the excess quantity is available for the additional circuit.
Ved et kendt servo-styresystem for køretøjer (DE-OS 23 60 610) forsyner en pumpe over en mængdeindstillingsanordning to 20 styre-servomotorer. Til en hjælpetilslutning af denne mængdeindstillingsanordning er tilsluttet en hjælpekreds, som har en aktiveringsventil og en deraf styret hjælpe-servomo-tor. Ved aktiveringsventilen er trykmiddeltilledningen forbundet med tanken i neutralstillingen. I mængdeindstillings-25 anordningen er der anbragt en ventilanordning, som sørger for, at i denne mængdeindstillingsanordnings neutralstilling ledes den samlede trykmiddelmængde til hjælpekredsen, i arbejdsstillingerne formindskes denne trykmiddelmængde derimod i det omfang, som er nødvendig til indstilling af 3 0 styre-servomotoren.In a known vehicle servo control system (DE-OS 23 60 610), a pump over a quantity adjustment device supplies two 20 steering servomotors. To an auxiliary connection of this quantity setting device is connected an auxiliary circuit which has an actuating valve and an auxiliary servomotor controlled by it. At the actuating valve, the pressure medium supply is connected to the tank in the neutral position. In the quantity setting device a valve means is provided which ensures that in the neutral position of this quantity setting device the total pressure medium is fed to the auxiliary circuit, in the working positions, however, this amount of pressure means is reduced to the extent necessary for adjustment of the steering servomotor.
Opfindelsen har til hensigt at angive en styreanordning af den i indledningen angivne art, som for udnyttelse af overskudsolien har en tillægskreds og dog har en meget enkel opbygning.The invention intends to provide a control device of the kind specified in the preamble, which for the utilization of the surplus oil has a supplementary circuit and yet has a very simple structure.
3 1459863 145986
Denne opgave løses ifølge opfindelsen ved, at der foruden styrekreds og arbejdskreds mindst er tilsluttet en tillægskreds med en anden servomotor og en tilhørende, en pumpetilslutning, en tanktilslutning og mindst en arbejdstilslutning 5 opvisende aktiveringsventil, at en fælles pumpe forsyner trykreguleringsanordningens, mængdeindstillingsanordningens og aktiveringsventilens pumpetilslutninger over en prioritetsventil, som under påvirkning af trykfaldet over en blænde i styrekredsen overgår fra en tillægskredsen forsynende stil-10 ling til en arbejds- og styrekredsen forsynende stilling, og at trykreguleringsanordningens og mængdeindstillingsanordningens pumpetilslutninger er lukket i neutralstillingen, og aktiveringsventilens pumpetilslutning er forbundet med tanktilslutningen.This task is solved according to the invention in that, in addition to the control circuit and the working circuit, at least one additional circuit is connected with another servomotor and an associated one, a pump connection, a tank connection and at least one working connection 5, which has an actuating valve, that a common pump supplies the pressure control device, the quantity adjustment valve of the pressure control device and over a priority valve which, under the influence of the pressure drop across a aperture in the control circuit, switches from an auxiliary supply position to a supply and control circuit position, and that the pump control of the pressure control device and the quantity adjustment device are closed in the neutral position and the connection connection of the actuating valve is connected to the pump connection. .
15 Prioritetsventilen sørger for, at ved en aktivering af mængdeindstillingsanordningen kommer kun den i arbejds- og styrekreds ikke nødvendige overskudsmængde ind i tillægskredsen. Prioritetsventilens styring sker kun i afhængighed af styrekredsmængden, hvilket betyder en meget enkel opbygning; 20 dette er muligt, fordi arbejdskredsmængde og styrekredsmængde er proportionale i forhold til hinanden. Ganske vist behøver man en trykreguleringsanordning og en mængdeindstillingsanordning, hvis pumpetilslutning i neutralstillingen er lukket.15 The priority valve ensures that, by activating the quantity adjustment device, only the excess quantity not needed in the work and control circuit enters the additional circuit. The control of the priority valve is only dependent on the control circuit volume, which means a very simple structure; This is possible because the workload and the control circuit are proportional to each other. Admittedly, a pressure control device and a quantity adjustment device are required if the pump connection in the neutral position is closed.
Trods dette kan ved hvilende servomotorer, hvis også aktive-25 ringsventilen befinder sig i neutralstillingen, pumpens forsyningsmængde over prioritetsventilen og aktiveringsventilen komme ind i tanken, således at pumpeydelsen kan holdes lav.Despite this, with dormant servomotors, if the actuating valve is also in the neutral position, the supply of the pump over the priority valve and the actuating valve can enter the tank, so that the pump performance can be kept low.
Med særlig fordel er der sørget for, at blænden er anbragt i 30 mængdeindstillingsanordningen mellem pumpetilslutning og en mængdemåleanordning, og at prioritetsventilen har to hinanden modvirkende trykkamre, af hvilke det første er forbundet med den nævnte pumpetilslutning, og det andet har en fjeder og er forbundet med en trykfølertilslutning, som i neutralstil- 145986 4 lingen er forbundet med tanktilslutningen og i en driftsstilling med mængdemåleanordningens indgang. Dette giver en meget enkel mulighed for at styre prioritetsventilen, for den ene forbindelsesledning kan anbringes på den let tilgæn-5 gelige pumpetilslutning eller den dermed forbundne tilledning. Omstyringen af trykket på trykfølertilslutningen sikrer, at prioritetsventilen ved ikke aktiveret mængdeindstillingsanordning sikkert indtager den ene endestilling.Particular advantage is provided that the aperture is arranged in the quantity adjustment device between pump connection and a quantity measurement device, and that the priority valve has two counteracting pressure chambers, the first of which is connected to said pump connection and the second has a spring and is connected. with a pressure sensor connection, which in the neutral position is connected to the tank connection and in an operating position with the input of the quantity measuring device. This provides a very simple opportunity to control the priority valve, for one connection line can be placed on the easily accessible pump connection or the associated supply line. The control of the pressure on the pressure sensor connection ensures that the priority valve, if not activated by quantity setting device, safely occupies one end position.
Fortrinsvis ændres blænden sammen med mængdeindstillingsanord-10 ningens indstilling. DrØvlingen af styrekredsmængden ved prioritetsventilen sker da på den måde, at trykfaldet over blænden holdes tilnærmelsesvis konstant. På denne måde tildeles styrekredsen den eksakte mængde.Preferably, the aperture changes with the setting of the quantity adjustment device 10. The control of the control circuit quantity at the priority valve then takes place in such a way that the pressure drop across the aperture is kept approximately constant. In this way, the control circuit is assigned the exact amount.
Endvidere kan begge mængdeindstillingsanordningens styretil-15 slutninger i neutralstillingen være forbundet med tanktilslutningen. Dette medfører, at trykreguleringsanordningens trykkamre straks aflastes, når mængdeindstillingsanordningen er vendt tilbage til neutralstillingen. Tilsvarende hurtigt følger også trykreguleringsanordningens indstillingsled og 20 vender tilbage til neutralstillingen.Furthermore, both of the quantity adjustment device's control connections in the neutral position may be connected to the tank connection. This causes the pressure control device of the pressure control device to be relieved immediately when the quantity adjustment device has returned to the neutral position. Correspondingly, the pressure regulator also adjusts the adjustment stage and returns to the neutral position.
Opfindelsen forklares nærmere nedenfor under henvisning til et på tegningen vist udførelseseksempel, der viser i fig. 1 et koblingsdiagram af styreanordningen ifølge opfindelsen ved en omstilling af styre-servomo-25 toren og fig. 2 mængdeindstillingsanordningen i neutralstillingen.The invention is explained in more detail below with reference to an exemplary embodiment shown in the drawing, which shows in FIG. 1 is a schematic diagram of the control device according to the invention in a conversion of the control servomotor; and FIG. 2 the quantity adjustment device in the neutral position.
Der er anbragt en styre-servomotor 1, hvis to tilslutningsledninger 2 og 3 over en styrekreds 4 og en arbejdskreds 5 forsynes fra en fælles pumpe 6 med fast forsyningsmængde, og 30 en løfte-servomotor 7, som over en tillægskreds 8 forsynes fra den samme pumpe. Fælles for alle dele er også en tank 9.A control servomotor 1 is provided if two connecting lines 2 and 3 are supplied over a control circuit 4 and a working circuit 5 from a common pump 6 with a fixed supply and 30 a lifting servomotor 7 which is supplied from the same over an additional circuit 8. pump. Common to all parts is also a tank 9.
5 1459865 145986
Styrekredsen 4 har en mængdeindstillingsanordning 10, som har en pumpetilslutning 11, en tanktilslutning 12, to styretilslutninger 13 og 14 samt en trykfølertilslutning 15. Den aktiveres således ved hjælp af et styrehåndhjul 16, at en 5 til styrehåndhjulets drejehastighed svarende trykvæskemængde fra pumpetilslutningen 11 strømmer til styretilslutningen 13 (eller ved modsat omdrejningsretning til styretilslutningen 14) over en mængdemåleanordning 17 og en denne forankoblet, i afhængighed af indstillingen variabel blænde 18. Styretil-10 slutningen 13 er over en styreledning 19 og en styreventil 20 forbundet med styre-servomotorens 1 tilslutning 2, styretilslutningen 14 er over en styreledning 21 og en styreventil 22 forbundet med styre-servomotorens 1 tilslutning 3. Styreventilen 20 har et stempel 201, på begge sider af hvilket 15 der er anbragt trykkamre 202 og 203. I trykkammeret 202 råder tilslutningens 2 tryk og kraften af en fjeder 204, i trykkammeret 203 råder trykket i styreledningen 19. Som trekantede noter udformede drøvleåbninger 205 frigiver alt efter stemplets 201 stilling forskellige drøvletværsnit, som 20 står i en nøje forudbestemt relation til trykfaldet over styreventilen. Styreventilen 22 er opbygget på samme måde.The control circuit 4 has a quantity adjustment device 10 which has a pump connection 11, a tank connection 12, two control connections 13 and 14 and a pressure sensor connection 15. It is activated by means of a control handwheel 16 such that a fluid flow rate corresponding to the control handwheel 5 flows from the pump connection 11. the control connection 13 (or at the opposite direction of rotation to the control connection 14) over a quantity measuring device 17 and a pre-coupled one, depending on the setting of variable aperture 18. The control connection 13 is connected via a control line 19 and a control valve 20 to the connection 2 of the control servomotor 1. , the control connection 14 is connected over a control line 21 and a control valve 22 to the connection 3. of the control servomotor 1, the control valve 20 has a piston 201, on both sides of which 15 are placed pressure chambers 202 and 203. In the pressure chamber 202, the pressure of the connection 2 prevails and The force of a spring 204 in the pressure chamber 203 prevails in the pressure of the control conductor 19. As the triangular notes, throttle openings 205 are formed, depending on the position of the piston 201, releasing different thrust cross sections which 20 are in a precisely predetermined relation to the pressure drop across the control valve. The control valve 22 is similarly constructed.
I neutralstillingen (fig. 2) er ved mængdeindstillingsanordningen 10 pumpetilslutningen 11 lukket. Derfor er begge styretilslutninger 13 og 14 og trykfølertilslutningen 15 25 forbundet med tanktilslutningen.In the neutral position (Fig. 2), the pump connection 11 is closed by the quantity adjustment device 10. Therefore, both control connections 13 and 14 and the pressure sensor connection 15 25 are connected to the tank connection.
Arbejdskredsen 5 har en trykreguleringsanordning 23, hvis glider 24 har et afsnit 25, som i neutralstillingen lukker den mod pumpen 6 vendte pumpetilslutning 26, men i driftsstillingerne frigiver arbejdstilslutninger henholdsvis 27 og 28, 30 hvorved til enhver tid den anden arbejdstilslutning er forbundet med tanktilslutningen 29. En endeflade af glideren 24 grænser op til et trykkammer 30, som over en blænde er forbundet med styreledningen 19, den anden endeflade grænser op til et kammer 31, som over en -blænde er forbundet med 145986 6 styreledningen 21. Begge kamre er over hver en kontraventil henholdsvis 32 og 33 forbundet med den til enhver tid over for liggende arbejdstilslutning henholdsvis 28 og 27. Som følge heraf indstiller glideren 24 sig som funktion af 5 trykket i arbejdstilslutningen 27 og trykket i styreledningen 19 og ved en udstyring i modsat retning trykket i arbejdstilslutningen 28 og styreledningen 21. En arbejdsledning 34 forbinder arbejdstilslutningen 27 over en hovedventil 35 med styre-servomotorens 1 tilslutning 2. En arbejdsledning 36 10 forbinder arbejdstilslutningen 28 med tilslutningen 3 over en hovedventil 37. Begge hovedventiler har en lignende opbygning som styreventilen 20 og i fremløbsdrift også en funktion, der er lig med denne.The working circuit 5 has a pressure regulating device 23, whose slides 24 have a section 25 which in the neutral position closes the pump connection 26 facing the pump 6, but in the operating positions releases working connections 27 and 28, 30 respectively, whereby the other working connection is connected to the tank connection 29 at all times. One end surface of the slider 24 adjoins a pressure chamber 30 which is connected over a aperture to the control line 19, the other end surface adjoins a chamber 31 which is connected over a aperture to the control line 21. Both chambers are above each a non-return valve 32 and 33 connected to the working connection 28 and 27. respectively, as a result of which, the slider 24 adjusts as a function of the pressure in the working connection 27 and the pressure in the control line 19 and, in the opposite direction, the pressure. in the working connection 28 and the control line 21. A work line 34 connects the working connection 27 over an h oven valve 35 with the control servomotor 1 connection 2. A work line 36 10 connects the working connection 28 to the connection 3 over a main valve 37. Both main valves have a similar structure as the control valve 20 and in flow operation also a function similar to this.
Hver hovedventil er forsynet med et tilbagestillingselement 15 henholdsvis 38 eller 39. Dette har et stempel 390, som på den ene side er begrænset af et kammer 391, som er forbundet med styreledningen 19, og på den anden side af et kammer 392, som er forbundet med arbejdsledningen 36. Stemplet 390 bærer en forlængelse 393, som åbner en omstillingsventil 20 394, således at der frembringes en forbindelse fra tilslutnin gen 3 over en blænde 395, hovedventilens 37 kammer 372, en yderligere blænde 396 og omstillingsventilen 394 til arbejdsledningen 36. Dette bevirker en trykændring i kammeret 372, således at hovedventilen 37 åbnes ved den beskrevne driftsmå-25 de. Tilbagestillingselementet 38 virker på lignende måde på hovedventilen 35.Each main valve is provided with a reset element 15 or 38 or 39, respectively. This has a piston 390 which is limited on one side by a chamber 391 which is connected to the control line 19 and on the other side by a chamber 392 which is connected to the work line 36. The piston 390 carries an extension 393 which opens a switching valve 20 394 so that a connection is made from the connection 3 over an aperture 395, the chamber 372 of the main valve 37, an additional aperture 396 and the switching valve 394 to the work line 36. This causes a pressure change in the chamber 372 so that the main valve 37 is opened in the described operating mode. The reset element 38 acts similarly on the main valve 35.
Tilslutningerne 2 og 3 er på sædvanlig måde forbundet med tanken 9 over sugeventiler 40 og 41 samt over overtryksventiler 42 og 43.The connections 2 and 3 are connected in a conventional manner to the tank 9 over suction valves 40 and 41 as well as over pressure valves 42 and 43.
30 Tillægskredsen 8 har en tillægsledning 44, en aktiveringsventil 45 og løfte-servomotoren 7. Aktiveringsventilen 45 har en pumpetilslutning 46, en tanktilslutning 47 og en arbejds-tilslutning 48. I neutralstillingen forbinder aktiveringsventilen 45 pumpetilslutningen 46 med tanktilslutningen 47.The auxiliary circuit 8 has an auxiliary line 44, an actuating valve 45 and the lifting servomotor 7. The actuating valve 45 has a pump connection 46, a tank connection 47 and a working connection 48. In the neutral position, the actuating valve 45 connects the pump connection 46 to the tank connection 47.
145986 7145986 7
En prioritetsventil 49 har en glider 50, som er belastet af en fjeder 52. I samme retning virker trykket i et kammer 53, som over en trykfølerledning 54 tilføres fra trykfølertilslut-ningen 15. I modsat retning virker trykket i et kammer 55, 5 som over en trykfølerledning 56 tilføres fra pumpetilslutningen 11. Glideren 50 danner med to ringnoter 57 og 58 to korresponderende blænder, som henholdsvis behersker tilførslen til ledningen 44 og til ringnoten 26 og tilførslen over en ledning 59 til mængdeindstillingsanordningens 10 pumpetil-10 slutning 11.A priority valve 49 has a slider 50 which is loaded by a spring 52. In the same direction, the pressure acts in a chamber 53 which is supplied over a pressure sensor line 54 from the pressure sensor connection 15. In the opposite direction, the pressure in a chamber 55, 5 acts as over a pressure sensor line 56 is supplied from the pump connection 11. The slider 50 forms with two ring grooves 57 and 58 two corresponding apertures, respectively controlling the supply to the conduit 44 and to the ring groove 26 and the supply over a conduit 59 to the pump connection 10 of the quantity adjustment device 10.
Ved denne styreanordning fremkommer følgende drift:The following operation results from this control device:
Hvis mængdeindstillingsanordningen 10 indtager sin neutralstilling (fig. 2), er også trykreguleringsanordningen 23 i neutralstilling. Styrekreds 4 og arbejdskreds 5 er derfor 15 spærret. Trykket i prioritetsventilens 49 kammer 55 svarer cirka til pumpetrykket, trykket i kammeret 53 svarer cirka til tanktrykket. Glideren 50 går derfor i sin højre endestilling. Den samlede pumpevæske føres ind i tillægskredsen 8.If the quantity adjustment device 10 takes its neutral position (Fig. 2), the pressure control device 23 is also in neutral position. Control circuit 4 and work circuit 5 are therefore 15 blocked. The pressure in the chamber 55 of the priority valve 49 corresponds approximately to the pump pressure, the pressure in the chamber 53 corresponds approximately to the tank pressure. The slider 50 therefore goes in its right end position. The total pump fluid is fed into the auxiliary circuit 8.
Når aktiveringsventilen 45 der indtager sin neutralstilling, 20 kommer trykvæske umiddelbart ind i tanken 9. Hvis aktiveringsventilen 45 indtager en anden stilling, enten hæves eller sænkes løfte-servomotoren.When the actuating valve 45 occupies its neutral position 20, pressurized fluid immediately enters the tank 9. If the actuating valve 45 occupies another position, the lifting servomotor is either raised or lowered.
Ved en drejning af styrehåndhjulet 16 mod højre, åbnes blænden 18. Der kommer trykvæske i en afmålt mængde over 25 mængdemåleanordningen 17 og styreledningen 19 til styreventilen 20, hvorved denne går i en til mængden svarende åbningsstilling. Trykket i styreledningen 19 frembringes ved hjælp af trykreguleringsanordningen 23 også i arbejdsledningen 34.By turning the control handwheel 16 to the right, the aperture 18. The pressure fluid is opened in a metered quantity above 25 the quantity measuring device 17 and the control line 19 to the control valve 20, whereby it enters an opening position corresponding to the quantity. The pressure in the control line 19 is generated by the pressure control device 23 also in the working line 34.
Da styreventilens 20 og hovedventilens 35 kamre er forbundet 30 med hinanden, vil der herske samme trykfald over styreventilen 20 og hovedventilen 35. Som følge deraf åbner hovedventilen således, at en trykvæskemængde strømmer igennem, som er proportional med den gennem mængdeindstillingsanordningen 10 8 145986 flydende trykvæskemængde. Samtidig trykkes tilbagestillingselementets 39 stempel 390 mod højre. Herved åbnes hovedventilen 37. Som følge heraf kan en væskemængde svarende til den over tilslutningen 2 til servomotoren 1 tilførte mængde 5 strømme fra servomotoren 1 til tanken 9 via tilslutningen 3, hovedventilen 37 og trykreguleringsanordningen 23. Noget lignende optræder ved en drejning af styrehåndhjulet 16 mod venstre. Hvis mængdeindstillingsanordningen 10 pludselig blev bragt tilbage til neutralstillingen, ville der i styre-10 ledningerne 19 og 21 råde tanktryk, således at også trykreguleringsanordningen 23 hurtigt ville vende tilbage til neutralstillingen.As the chambers of the control valve 20 and the main valve 35 are connected to each other, the same pressure drop will prevail over the control valve 20 and the main valve 35. As a result, the main valve opens such that a flow of pressure fluid which is proportional to the flow rate of the fluid adjusting device 10 8 145986 . At the same time, the piston 390 of the reset element 39 is pressed to the right. Hereby the main valve 37 is opened. As a result, a quantity of liquid corresponding to the amount of 5 supplied over the connection 2 to the servomotor 1 can flow from the servomotor 1 to the tank 9 via the connection 3, the main valve 37 and the pressure control device 23. Something similar occurs with a rotation of the control handwheel 16 towards left. If the quantity adjusting device 10 was suddenly brought back to the neutral position, tank pressure 19 and 21 would have tank pressure, so that the pressure regulating device 23 would also quickly return to the neutral position.
Når der strømmer trykvæske over mængdeindstillingsanordningen 10, optræder der et trykfald på den variable blænde 18.When pressure fluid flows over the quantity adjustment device 10, a pressure drop occurs on the variable aperture 18.
15 Dette kommer til udtryk på prioritetsventilens 49 glider 50. Glideren indtager en ligevægtsstilling, ved hvilken trykfaldet svarer til fjederens 52 kraft. Denne ligevægtsstilling opnås kun, hvis glideren 50 fra sin højre endestilling forskydes mod venstre, hvorved den i omkredsnotens 58 område 20 dannede blænde åbnes yderligere. Men samtidig drøvles tilstrømningen til tillægskredsen 8 på omkredsnoten 57. Dette frembringer prioritetsfunktionen, hvorefter styre- og arbejdskreds principielt priviligeres i forhold til tillægskredsen.This is reflected in the slider 50 of the priority valve 49. The slider assumes an equilibrium position at which the pressure drop corresponds to the force of the spring 52. This equilibrium position is obtained only if the slider 50 from its right end position is shifted to the left, thereby further opening the aperture formed in the region 20 of the circumferential groove 58. However, at the same time, the influx to the auxiliary circuit 8 on the perimeter note 57 is throttled. This produces the priority function, whereupon the control and work circuit are in principle privileged in relation to the auxiliary circuit.
Da styrekredsmængde og arbejdskredsmængde ved hjælp af 25 prioritetsventilen 50 drøvles til det samme tryk, belastes trykreguleringsanordningen 23 kun i ringe grad af strømnings-kræfter. Den kan derfor indstilles meget nøjagtigt til den pågældende ligevægtstilstand, således at der fremkommer en stor nøjagtighed med henblik på proportionaliteten mellem 30 styrekredsmængde og arbejdskredsmængde.Since the control circuit quantity and the working circuit quantity are throttled to the same pressure by means of the priority valve 50, the pressure control device 23 is only subjected to a small amount of flow forces. It can therefore be adjusted very precisely to the equilibrium state in question, so that a high accuracy is obtained for the proportionality between 30 control circuit and working circuit quantity.
Stiplet er der vist en blok 60, hvori de to hovedventiler 35 og 37, de tilhørende tilbagestillingselementer 38 og 39, styreventilerne 20 og 22, trykreguleringsanordningen 23, U 5986 9 prioritetsventilen 49, yderligere ventiler 40 - 43 og de tilhørende forbindelsesledninger er anbragt.Dotted is a block 60 in which the two main valves 35 and 37, the associated reset elements 38 and 39, the control valves 20 and 22, the pressure control device 23, the priority valve 49, additional valves 40-43 and the associated connection lines are arranged.
Som mængdeindstillingsanordning egner sig især et apparat som beskrevet i DE-PS 1 293 029, ved hvilket der yderligere 5 er anbragt blænden 18, trykfølertilslutningen og de i neutralstillingen virksomme tanktilslutningsforbindelser.Particularly suitable as a quantity adjustment device is an apparatus as described in DE-PS 1 293 029, in which further the aperture 18, the pressure sensor connection and the tank connection connections operating in the neutral position are arranged.
>>
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2738463A DE2738463C2 (en) | 1977-08-26 | 1977-08-26 | Hydraulic control device for a preferred first servomotor used for vehicle steering and at least one second servomotor |
| DE2738463 | 1977-08-26 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DK362778A DK362778A (en) | 1979-02-27 |
| DK145986B true DK145986B (en) | 1983-05-09 |
| DK145986C DK145986C (en) | 1983-10-10 |
Family
ID=6017340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK362778A DK145986C (en) | 1977-08-26 | 1978-08-17 | HYDRAULIC STEERING SYSTEM FOR A SERVOMOTOR, PARTICULAR FOR STEERING |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5928764B2 (en) |
| DD (1) | DD138297A5 (en) |
| DE (1) | DE2738463C2 (en) |
| DK (1) | DK145986C (en) |
| FR (1) | FR2401343A1 (en) |
| GB (1) | GB2003100B (en) |
| IT (1) | IT7868984A0 (en) |
| SE (1) | SE7808941L (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2932847C2 (en) * | 1979-08-14 | 1982-05-13 | Danfoss A/S, 6430 Nordborg | Hydraulic control device for a servomotor, in particular for vehicle steering |
| JPS5649547A (en) * | 1979-09-28 | 1981-05-06 | Hitachi Ltd | Manufacture of semiconductor device |
| JPS58148440A (en) * | 1982-02-27 | 1983-09-03 | Toshiba Chem Corp | Plastic ic chip package |
| CS235845B1 (en) * | 1983-04-27 | 1985-05-15 | Bohumil Polacek | Hydraulic two-stage control device for a servomotor |
| DE3428403A1 (en) * | 1983-08-01 | 1985-04-11 | Závody těžkého strojírenství Výzkumný ústav stavebních a zemních stroju, Brünn/Brno | Two stage, pressure-compensated hydraulic control device for at least two consuming units |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3653209A (en) * | 1970-08-31 | 1972-04-04 | Bendix Corp | Vehicle hydraulic system |
| US3834278A (en) * | 1972-12-15 | 1974-09-10 | Trw Inc | Power steering system with auxiliary power capability |
| DE2305798C3 (en) * | 1973-02-07 | 1975-09-18 | Danfoss A/S, Nordborg (Daenemark) | Hydraulic control device for a servomotor, in particular for vehicle steering |
| US3979907A (en) * | 1973-09-10 | 1976-09-14 | Parker-Hannifin Corporation | Priority control valve |
| US4043419A (en) * | 1976-06-04 | 1977-08-23 | Eaton Corporation | Load sensing power steering system |
-
1977
- 1977-08-26 DE DE2738463A patent/DE2738463C2/en not_active Expired
-
1978
- 1978-01-20 JP JP53005126A patent/JPS5928764B2/en not_active Expired
- 1978-08-17 DK DK362778A patent/DK145986C/en not_active IP Right Cessation
- 1978-08-18 FR FR7824169A patent/FR2401343A1/en active Granted
- 1978-08-22 GB GB7834139A patent/GB2003100B/en not_active Expired
- 1978-08-23 DD DD78207437A patent/DD138297A5/en unknown
- 1978-08-24 SE SE7808941A patent/SE7808941L/en unknown
- 1978-08-25 IT IT7868984A patent/IT7868984A0/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DK362778A (en) | 1979-02-27 |
| DE2738463A1 (en) | 1979-03-08 |
| FR2401343B1 (en) | 1983-07-22 |
| DD138297A5 (en) | 1979-10-24 |
| JPS5436454A (en) | 1979-03-17 |
| JPS5928764B2 (en) | 1984-07-16 |
| SE7808941L (en) | 1979-02-27 |
| GB2003100A (en) | 1979-03-07 |
| FR2401343A1 (en) | 1979-03-23 |
| DK145986C (en) | 1983-10-10 |
| IT7868984A0 (en) | 1978-08-25 |
| DE2738463C2 (en) | 1982-05-13 |
| GB2003100B (en) | 1982-03-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DK149933B (en) | HYDRAULIC STEERING DEVICE FOR A SERVOMOTOR, VEHICLE CONTROLS | |
| US4501291A (en) | Relief valve arrangement | |
| US4348159A (en) | Convertible pump servo-valve control | |
| US4478245A (en) | Electrically controllable valve assembly | |
| DK164693B (en) | CONTROLLER FOR LOAD-SENSING HYDRAULIC PLANT | |
| DK157183B (en) | FLUIDUM BASED CONTROLLER | |
| DK149556B (en) | CONTROL DEVICE FOR A HYDRAULIC ENGINE | |
| NL7701659A (en) | LIQUID FLOW CONTROL DEVICE. | |
| US4787294A (en) | Sectional flow control and load check assembly | |
| DK145986B (en) | HYDRAULIC STEERING SYSTEM FOR A SERVOMOTOR, PARTICULAR FOR STEERING | |
| NO178839B (en) | Flow regulator for maintaining a steady flow of fluid | |
| US3520231A (en) | Hydraulic supply systems with flow rate-limiting control | |
| US3587393A (en) | Hydraulic circuit breaker | |
| DK167984B1 (en) | CONTROL FOR A PUMP WITH ADJUSTABLE DELIVERY | |
| KR830008060A (en) | Hydraulic control system | |
| US4220004A (en) | Hydraulic servo-control system with out-of-balance load | |
| US2969647A (en) | Synchronizing system | |
| US5212950A (en) | Hydraulic circuit with pilot pressure controlled bypass | |
| EP0022755B1 (en) | Load control and holding valve | |
| GB2210679A (en) | Load-independent control device for hydraulic users | |
| US2340524A (en) | Automatic control for aircraft and the like | |
| USRE29672E (en) | Demand compensated hydraulic system with pressure amplifier | |
| SE522698C2 (en) | Hydraulic valve assembly | |
| US2737253A (en) | Propeller pitch control | |
| US3007514A (en) | Fluid control device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PBP | Patent lapsed |