SE201309C1

SE201309C1 -

Info

Publication number: SE201309C1
Authority: SE
Publication date: 1965-01-01

Description

KLASS INTERNATIONELLSVENSK B62 d63 c:47 PATENT- OCH REGISTRERINGSVERKET Ans. 10 947/1962 inkom den 12/10 1962 utlagd den 12/4 196 INTERNATIONAL HARVESTER Co., CHICAGO, ILL. USA Manoverventil for hydrauliska servostyrniUgsanordningar Uppilinnare: D A Kries Prioritet begard freuz den 12 oktober 1961 (USA) Foreliggande uppfinning harder sig till servostyrning och avser en manliverventil for hydrauliska servostyrningsanordningar, forsedd med en vridslid, anordnad med en begransad vridningsvinkel i en hylsa, som fir fritt vridbar i ventilhuset, vilken vridslid fir forsedd med periferiella och axiella kanaler, vilka samverka med radiella hal i hylsan, vilka hal aro permanent f8rbundna med ringformiga urtagningar i ventilhusets innervagg, vilka urtagningar i sin tur aro forbundna med in- och utlopp. CLASS INTERNATIONAL SWEDISH B62 d63 c: 47 PATENT AND REGISTRATION AGENCY Ans. 10 947/1962 filed on 12/10 1962 issued on 12/4 196 INTERNATIONAL HARVESTER Co., CHICAGO, ILL. United States Manual Valve for Hydraulic Power Steering Devices Inventor: DA Kries Priority requested on 12 October 1961 (USA) rotatable in the valve housing, which rotary slide is provided with peripheral and axial channels, which co-operate with radial slides in the sleeve, which slides are permanently connected to annular recesses in the inner cradle of the valve housing, which recesses are in turn connected to inlets and outlets.

Dar servostyrningsanordningar utnyttj as vid fordon, exempelvis traktorer, ligger egenfrekvensen for framhjulens vibrationer vid ungefar 8-9 hertz. Det har visat sig, att vid konventionella manoverventiler av angivet slag, som utnyttjas fOr styrning av sadana anordningar, uppkommer resonansvibration vid denna frekvens i ventilen, vilket astadkommer ett ojamnt och pulserande vatskeflode genom systemet, och denna vibration fortplantas och medf8r allvarliga hjulskakningar. En dampning av ventilelementens inbordes vibration till en frekvens av ungefar 3 hertz eliminerar denna olagenhet. When power steering devices are used in vehicles, such as tractors, the natural frequency of front wheel vibrations is approximately 8-9 hertz. It has been found that in conventional control valves of the type indicated, which are used to control such devices, resonant vibration occurs at this frequency in the valve, which produces an uneven and pulsating liquid flow through the system, and this vibration propagates and causes severe wheel vibrations. A damping of the inboard vibration of the valve elements to a frequency of approximately 3 hertz eliminates this malfunction.

Andamalet med uppfinningen fir darfor att skapa en manoverventil for servostyrningsanordningar, vilken kompenserar for resonansvibrationer, som av hjulen astadkommas i servostyrningsanordningen under driftsforhallanden. Detta andamal uppnas med man8verventilen enligt uppfinningen darigenom att den erhallit de i patentanspraken angivna kannetecknen. The object of the invention is therefore to create a control valve for power steering devices, which compensates for resonant vibrations which are produced by the wheels in the power steering device during operating conditions. This object is achieved with the control valve according to the invention in that it has obtained the pitches specified in the patent claims.

Uppfinningen beskrives narmare i det 101- jande med hanvisning till bifogade ritningar, dar fig. 1 visar schematiskt ett fordon med en manOverventil enligt uppfinningen, fig. 2 ar ett snitt, som visar manoverventilen i neutral- eller forbiledningslaget, fig. 3 Or ett snitt Ifings linjen 3-3 i fig. 2, fig. 4 fir ett snitt, som visar ventilen i dess delvis paverkande lage, fig. 5 Or ett snitt Hugs linj en 5-5 i fig. 4, fig. 6 visar i forstoring dampningskonstruktionen i detalj, varvid vissa delar visas i snitt och fig. 7 visar i Mrstoring en annan utforingsform av dampningskonstruktionen i detalj, varvid vissa delar visas i snitt. The invention is described in more detail in the following with reference to the accompanying drawings, in which Fig. 1 schematically shows a vehicle with a control valve according to the invention, Fig. 2 is a section showing the control valve in the neutral or bypass layer, Fig. 3 is a section Ifings line 3-3 in Fig. 2, Fig. 4 is a section showing the valve in its partially acting bearing, Fig. 5 is a section Hugs line 5-5 in Fig. 4, Fig. 6 is an enlarged view of the steam structure. in detail, some parts being shown in section and Fig. 7 showing in Mrstoring another embodiment of the steam construction in detail, some parts being shown in section.

Det i fig. 1 visade fordonet 10, som i detta fall utgores av en isaktor, uppvisar en framre axel 11 och en bakre axel 12, pa vilka framhjulen 13 och bakhjulen 14 aro monterade. The vehicle 10 shown in Fig. 1, which in this case consists of an ice actuator, has a front axle 11 and a rear axle 12, on which the front wheels 13 and the rear wheels 14 are mounted.

Parallellstangerna 15 stracka sig frau var sin an.de pa axeln 11 till en mellanliggande styrarm. 16, som skjuter ut frau sektorhjulet 17. I ingrepp med sektorhjulet 17 Jigger en skruv 18, som under formedling av styraxlarna 19 och manoverventilens 20 mekaniska element Or ansluten till styrratten 21. The parallel rods 15 extend from each other on the shaft 11 to an intermediate guide arm. 16, which projects from the sector wheel 17. In engagement with the sector wheel 17 jiggles a screw 18, which during formation of the control shafts 19 and the mechanical elements Or of the control valve 20 is connected to the steering wheel 21.

Servokraft erhalles med hjalp av ett hydraulsystem, som innefattar en kolv-cylinderanordning 22, vilken är monterad mellan den fran. axeln 11 utskjutande konsolen 23 och styrarmen 16. Inloppssidan pa styrpumpen 24 star i forbindelse med en icke visad vatskebehallare. Pumpens utloppsledning 25 star under formedling av flodesdelaren 26 och ledningen 27 i forbindelse med manoverventilen 20. Ledningen 28 och ledningen 29 forbinda mantiverventilen 20 med var sin sida av kolvcylinderanordningen 22. Returledningen 2 leder fran manoverventilen 20 till vatskebehallaren. Servo power is obtained by means of a hydraulic system, which comprises a piston-cylinder device 22, which is mounted between it. the shaft 11 projecting the bracket 23 and the control arm 16. The inlet side of the control pump 24 communicates with a liquid container (not shown). The outlet line 25 of the pump is formed by the flow divider 26 and the line 27 in connection with the control valve 20. The line 28 and the line 29 connect the mantle valve 20 to each side of the piston-cylinder device 22. The return line 2 leads from the control valve 20 to the water tank.

Den i fig. 2-6 visade manOverventilen representerar en fOrbattring gentemot det amerikanska patentet 2 939 429. Den bestar av ett hus 31, en mellanliggande hylsa 32 och en vridslid 33. Inloppsporten, till vilken ledningen 27 dr ansluten, stracker sig genom huset och star i forbindelse med den ringformiga urtagningen 35, som stracker sig kring husets 31 hela insida. De mellanliggande portarna 36 och 38, till vilka ledningarna 28 resp. 29 arc anslutna, sta i forbindelse med de ringformiga urtagningarna 37 och 39. Pa motsvarande satt star utloppsporten 40, till vilken ledningen 30 är ansluten, i forbindelse med den ringf ormiga urtagningen 41. The control valve shown in Figures 2-6 represents an improvement over U.S. Pat. No. 2,939,429. stands in connection with the annular recess 35, which extends around the entire inside of the housing 31. The intermediate ports 36 and 38, to which the conduits 28 and 28, respectively. 29 arc connected, are connected to the annular recesses 37 and 39. Correspondingly, the outlet port 40, to which the conduit 30 is connected, is connected to the annular recess 41.

Vridsliden 33 omfattar fiven det rafflade kopplingsorganet 33a, som medelst en axel 33b ar forbundet med styrratten 21. Langs vridslidens 33 periferi stacker sig slitsen 42, vars uppgift beskrives sal) are. Vridsliden 33 är anordnad inuti hylsan 32 och uppvisar ett flertal tamligen korta, i langdriktningen orienterade och koncentriskt fordelade kanaler 43, av vilka en betecknats med 43a. Endast nagra air kanalerna 43 visas pa ritningarna. Mellan kanalerna 43 arc vaxelvis anordnade ett flertal tamligen lãnga, i langdriktningen orienterade och koncentriskt fordelade kanaler 44, av vilka endast en visas. Tvars genom vridsliden 33 stracker sig kanalen 45. Vid vardera av dennas hada andar Sr inford en kolv 46, som är nog-grant bearbetad for att glida i kanalen 45, varvid en fjader 47 paverkar kolvarna 46. Kolvarna 46 stada mot de som kamorgan verksamma vaggarna pa hylsans 32 urtagningar 48. The rotary slide 33 comprises the knurled coupling member 33a, which is connected to the guide knob 21 by means of a shaft 33b. The rotary slide 33 is arranged inside the sleeve 32 and has a plurality of rather short, longitudinally oriented and concentrically distributed channels 43, one of which is designated 43a. Only a few air ducts 43 are shown in the drawings. Arranged between the channels 43 are alternately arranged a plurality of rather long, longitudinally oriented and concentrically distributed channels 44, of which only one is shown. The channel 45 extends through the rotating slide 33. At each of its hot spirits Sr a piston 46 is inserted, which is carefully machined to slide in the channel 45, a spring 47 acting on the pistons 46. The pistons 46 stand against those acting as cam members. the cradles on the recesses 48 of the sleeve 48.

En • kanal 49 sammanhinder den tamligen korta, langsgaende kanalen 43a och kanalen 45 (fig. 6). I kanalen 49 fir anordnad en hylsa 50, som uppvisar ett ventilate 51 vid den ena anden och en inatriktad flans 52 vid den andra. En kula 53 är anordnad inuti hylsan 50 och pressas medelst fjadern 54 mot ventilsatet. A channel 49 connects the rather short, longitudinal channel 43a and the channel 45 (Fig. 6). Arranged in the channel 49 is a sleeve 50, which has a vent 51 at one end and a misaligned flange 52 at the other. A ball 53 is arranged inside the sleeve 50 and is pressed by means of the spring 54 against the valve seat.

Till hylsan 32 Sr kopplad en tapp 55, som ãr fastsatt i den ena anden 19a pa axeln 19 och som samverkar med vridslidens 33 slits 42. Hylsan 32 uppvisar ett flertal radiella hal 56, av vilka endast nagra visas och vilka under formedling av den ringformiga urtagningen 35 forbinda inloppsporten 34 med kanalerna 43. Pa motsvarande sfitt arc ett flertal radiella hal 57 och 58, av vilka samtliga icke visas, anordnade att under formedling av de ringformiga urtagningarna 37 och 39 forbinda portarna 36 och 38 med kanalerna 43 och 44, nar vridsliden 33 vrides i forhallande till hylsan inom grfinserna for tappens 55 rorelse i slitsen 42. Vidare aro ett flertal hal 59, av vilka samtliga icke visas, anordnade att under formedling av den ringformiga urtagningen 41 forbinda utloppet 40 med de tamligen langa kanalerna 44. Ett av Mien 56 star standigt i forbindelse med den ringformiga urtagningen 35 och kanalen 43a, och star saledes i forbindelse med kanalen 45 via kanalen 49. Likasa. star ett av halen 59 standigt i forbindelse med den ringformiga urtagningen 41 och det omrade i hylsan 32, vilket begransas av vane urtagning 48. Connected to the sleeve 32 is a pin 55, which is fixed in one end 19a on the shaft 19 and which cooperates with the slot 42 of the rotary slide 33. The sleeve 32 has a plurality of radial hales 56, of which only a few are shown and which during transmission of the annular the recess 35 connects the inlet port 34 to the channels 43. On the corresponding sfitt arc a plurality of radial halls 57 and 58, all of which are not shown, are arranged to connect the ports 36 and 38 to the channels 43 and 44 during the mediation of the annular recesses 37 and 39. the rotating slide 33 is rotated in relation to the sleeve within the grooves for the movement of the pin 55 in the slot 42. Furthermore, a plurality of halls 59, all of which are not shown, are arranged to connect the outlet 40 to the rather long channels 44 during the formation of the annular recess 41. of the Mien 56 is permanently connected to the annular recess 35 and the channel 43a, and is thus connected to the channel 45 via the channel 49. Likasa. one of the tails 59 is permanently connected to the annular recess 41 and the area in the sleeve 32, which is bounded by the habit recess 48.

Under normala arbetsforhallanden, asom nar fordonet framfores i en rak bana, intager manoverventilen 20 det i fig. 2 visade forbiledningslaget. Harvid strommar vatska genom inloppsporten 34, kring den ringformiga urtagningen 35, genom halen 56, langs de tamligen korta kanalerna 43 och 43a, forbi halen 57 och 58, vilka i detta lage overlappa kanalerna 43 och 44, langs kanalerna 44, genom Mien 59, kring den ringformiga urtagningen 41 och ut frail utloppsporten 40. Ventilkroppen 53 vilar mot satet 51, och flagon vatska kan icke stromma frau kanalen 43a till kanalen mot trycket hos den i kanalen 45 inneslutna vatskan. Kolvarna 46 pressas mot vaggarna pa. urtagningarna 48 for att bibehalla vridsliden 33 i neutralt lage i forhallande till hylsan 32. Under normal operating conditions, as when the vehicle is driven in a straight path, the control valve 20 assumes the bypass layer shown in Fig. 2. In this case, liquid flows through the inlet port 34, around the annular recess 35, through the tail 56, along the rather short channels 43 and 43a, past the tail 57 and 58, which in this layer overlap the channels 43 and 44, along the channels 44, through the Mien 59, around the annular recess 41 and out of the outlet port 40. The valve body 53 rests against the seat 51, and flake liquid cannot flow from the channel 43a to the channel against the pressure of the liquid enclosed in the channel 45. The pistons 46 are pressed against the cradles. the recesses 48 for maintaining the rotating slide 33 in a neutral position relative to the sleeve 32.

Under normal forflyttning langs en rak bana utsattas framhjulen 13 f Or vibration, som uppkommer genom stotar fran vagbanan. Vibrationen fortplantas genom styrelementen 18, 19 och 19a samt tappen 55 till manoverventilens 20 hylsa 32 och fororsakar en inbordes rorelse mellan hylsan 32 och vridsliden 33. Det liar visat sig, att resonansvibration, som uppkommer i ventilen 20, fororsakar oscillation mellan det neutrala forbiledningslaget i fig. 2 och det hogra eller det vanstra, paverkande lfiget i fig. 4, i vilket halen 57 och 58 icke langre overlappa kanalerna 43 och 44. Harvid inkommer vatska i inloppet 34, passerar genom den ringformiga urtagningen 35, halm 56, kanalerna 43, Men 57, den ringformiga urtagningen 37 samt Mkt 36 till kolv-cylinderanordningens 22 ena sida. Vatska aterfores frail kolv-cylinderanordningens andra sida genom porten 38, den ringformiga urtagningen 39, Mien 58, kanalerna 44, halen 59, sparet 41 och ut genom porten 40 till behallaren. Denna momentana, icke onskvarda paverkan av ventilen fororsakar, cm den icke kompenseras, pulsation i vatskan.. During normal movement along a straight path, the front wheels 13 are exposed to vibration, which arises through bumps from the cradle. The vibration propagates through the guide elements 18, 19 and 19a and the pin 55 to the sleeve 32 of the control valve 20 and causes an inboard movement between the sleeve 32 and the rotating slide 33. It has been found that resonant vibration which occurs in the valve 20 causes oscillation between the neutral bypass layer Fig. 2 and the right or left-hand effect on Fig. 4, in which the tails 57 and 58 no longer overlap the channels 43 and 44. In this case, liquid enters the inlet 34, passes through the annular recess 35, straw 56, the channels 43 , But 57, the annular recess 37 and Mkt 36 to one side of the piston-cylinder device 22. Liquid is returned from the other side of the piston-cylinder device through the port 38, the annular recess 39, the Mien 58, the channels 44, the tail 59, the recess 41 and out through the port 40 to the container. This momentary, undesirable effect of the valve causes, if not compensated, pulsation in the liquid ..

Nfir kolvarna 46 glida Mugs vaggarna pa. urtagningarna 48, pressas de mot varandra mot vatskan i kanalen 45. Kolvamas noggranna passning i kanalen astadkommer en lackning av vatska under tryck frau kanalen 45 forbi kolvarna 46 med ett reglerat och forutbestamt flOde. Detta resulterar i en dampning 3 av frekvensen for vibrationen mellan hylsan 32 och vridsliden 33 forutom den dampning, som astadkommes genom kolvarnas 46 tryck mot urtagningarnas 48 vaggar. Det oregelbundna, mycket snabba oppnandet och slangandet av ventilen hammas tillrackligt for att vatskefliidet till kolv-cylinderanordningen 22 skall begransas och icke overfora hjulens 13 vibration till nagon mera betydande hjulskakning. Nar ventilen aterfores fran det i fig. 4 visade paverkande laget till det i fig. 2 visade neutrallaget, glida kolvarna 46 kings var sin urtagning 48 och avlasta trycket i kanalen 45. Nfir pistons 46 slide Mugs cradles pa. the recesses 48, they are pressed against each other against the liquid in the channel 45. The careful fit of the pistons in the channel provides a varnishing of liquid under pressure from the channel 45 past the pistons 46 with a regulated and predetermined flow. This results in a damping 3 of the frequency of the vibration between the sleeve 32 and the rotating slide 33 in addition to the steaming provided by the pressure of the pistons 46 against the cradles 48 of the recesses 48. The irregular, very rapid opening and hose of the valve is hammered sufficiently so that the liquid flow to the piston-cylinder device 22 is limited and does not transmit the vibration of the wheels 13 to any more significant wheel shaking. When the valve is returned from the actuating layer shown in Fig. 4 to the neutral layer shown in Fig. 2, the pistons 46 kings each slide their recess 48 and relieve the pressure in the channel 45.

Nar ratten 21 vrides, astadkommes en normal svangning genom att vatskestromning finales, sasom beskrivits i det foreghende. Ratten 21 wider under formedling av elementen 33a och 33b till att bOrja med vridsliden 33 i forhallande till hylsan 32 fran det i fig. 2 visade neutrallaget till det i fig 4 visade forbiledningslaget thorn de granser, som tillatas genom tappens 55 rorelse i slitsen 42. Nar tap-pen 55 natt slitsens 42 Linde, vridas vridsliden 33 och hylsan 32 darefter tillsammans i forhallande till huset 31 i detta helt paverkande lilge (icke visat) hos ventilen 20, varvid hylsans 32 hal orienteras sa i forhallande till vridsliden 33, att maximalt flode till kolvcylinderanordningen 22 -Mates. Nar ventilen 20 aterfores till det i fig. 2 visade laget, avlastas trycket i cylindern och svangningen avslutas. When the knob 21 is turned, a normal oscillation is achieved by finalizing liquid flow, as described above. While steering the elements 33a and 33b, the knob 21 widens to start with the rotating slide 33 in relation to the sleeve 32 from the neutral layer shown in Fig. 2 to the bypass layer shown in Fig. 4 thorn the boundaries allowed by the movement of the pin 55 in the slot 42. When the pin 55 night of the slot 42 Linde, the rotating slide 33 and the sleeve 32 are then rotated together in relation to the housing 31 in this fully acting position (not shown) of the valve 20, the sleeve 32 being oriented so in relation to the rotating slide 33 that flow to the piston-cylinder device 22 -Mates. When the valve 20 is returned to the layer shown in Fig. 2, the pressure in the cylinder is relieved and the oscillation is terminated.

En alternativ utforingsform visas i fig. 7. Vardera kolven 46 ãr fOrsedd med en taming 60 for att forhindra stromning fran kanalen 40 kring kolvarna 46, ndr dessa glida langs urtagningens 48 vaggar. Hylsan 0 fir avlagsnad frail kanalen 40, och i stallet for en overstromningsventil ãr en propp 61 inford i borrningen. Proppen 61 uppvisar ett hal 62, i vilket en metalltrad 63 ár anordnad. Yalskelackningen genom halet 61 ãr kritisk och maste regleras noggrant. Det har visat sig, att en stromningsvag med en tvarsnittsyta pa 0,075 mm2, som erhallits genom att en trad med 0,97 mm diameter inforts i ett hal med 1,02 mm diameter giver ett tillfredsstallande vatskeflode. Nar kolvarna 46 pressas mot varandra, strommar vatskan mot verkan av pumptrycket fran kanalen 45 genom halet 62 med detta noggrant reglerade node till kanalen 43a. Nar kolvarna 46 glida kings vaggarna i urtagningarna 48, strommar vatska under pumptryck fran kanalen 43a, genom halet 62 och tillbaka till kanalen 45. Traden 63 forhindrar aven att frammande foremal tappa till halet 62. Det torde inses, att Liget och kolvtatningarna kunna anordnas f8rutom och icke endast i stallet for iiverstromningsventilen f8r att, om sà erfordras, astadkomma ytterligare reglering. An alternative embodiment is shown in Fig. 7. Each piston 46 is provided with a taming 60 to prevent flow from the channel 40 around the pistons 46 as they slide along the cradles 48 of the recess 48. The sleeve 0 is removed from the channel 40, and instead of a flood valve, a plug 61 is inserted into the bore. The plug 61 has a hall 62, in which a metal row 63 is arranged. Yalsk lacquering through the tail 61 is critical and must be carefully regulated. It has been found that a flow wave with a cross-sectional area of 0.075 mm 2 obtained by inserting a 0.97 mm diameter wire into a 1.02 mm diameter hall provides a satisfactory liquid flow. When the pistons 46 are pressed against each other, the liquid flows against the action of the pump pressure from the channel 45 through the tail 62 with this carefully regulated node to the channel 43a. As the pistons 46 slide the rockers in the recesses 48, liquid flows under pump pressure from the channel 43a, through the tail 62 and back to the channel 45. The thread 63 also prevents foreign objects from dropping to the tail 62. It will be appreciated that the body and piston sockets may be arranged in addition to and not only in place of the overflow valve to provide, if necessary, further control.

Det torde a.ven inses, att modifikationer och detaljandringar kunna forekomma inom ramen f Or uppfinningstanken. It should also be understood that modifications and changes in detail may occur within the scope of the inventive concept.

Claims

Patent claim:

1. Control valve for hydraulic power steering devices, equipped with a. rotary slide (33), arranged with a limited angle of rotation in a sleeve (32) which is freely rotatable in the valve housing (31), which rotary slide Sr is provided with peripheral and axial channels (43, 44) which cooperate with radial slides (56-59). ) in the sleeve, which slides are permanently connected by annular recesses (35, 37, 39, 41) In the inner cradle of the valve housing, which recesses are in turn connected by inlet and outlet (34, 36, 38, 40), characterized in that a damper Sr arranged to vaporize the relative vibrations in the direction of rotation between the slide and the sleeve, which damper consists of two pistons (46) which are slidably arranged in a transverse channel (45) in the rotating slide (33) and arranged to abut against which cam members act as cam members. inner cradles (48) in the sleeve (32) with a spring (47).

Control valve according to claim 1, characterized in that a channel (49) is arranged in the rotary slide (33) Sr, which connects the transverse channel (45) to at least one of the axial channels (43a) and through which the volume of liquid in the space between the pistons (46) can be regulated.

Maneuvering valve according to claim 2, characterized in that the flow from and to the transverse channel (45) is arranged to be regulated by a flood valve (50-53) and by the piston fit against the cradles in the transverse channel (45).

Control valve according to claim 2, characterized in that the river frail and to the television channel channel (45) is arranged to be regulated by a throttle valve (61-63) and that sealing means (60) are present between the pistons (46) and the cradle of the transverse channel (45). .

Control valve according to claim 4, characterized in that the throttle valve is constituted by a fixed plug (61) with an axial hall (62), in which a pin or thread (63) is movably arranged. Cited publications: Patents from Germany 927 616, 939 071, 940 094.