EP0098083B1 - Servorégulateur de niveau - Google Patents

Servorégulateur de niveau Download PDF

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Publication number
EP0098083B1
EP0098083B1 EP83303522A EP83303522A EP0098083B1 EP 0098083 B1 EP0098083 B1 EP 0098083B1 EP 83303522 A EP83303522 A EP 83303522A EP 83303522 A EP83303522 A EP 83303522A EP 0098083 B1 EP0098083 B1 EP 0098083B1
Authority
EP
European Patent Office
Prior art keywords
valve
actuator
servo
valve member
supply
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
EP83303522A
Other languages
German (de)
English (en)
Other versions
EP0098083A1 (fr
Inventor
Roy Burrows
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.)
AUSTIN BEECH Ltd
Original Assignee
AUSTIN BEECH Ltd
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 AUSTIN BEECH Ltd filed Critical AUSTIN BEECH Ltd
Priority to AT83303522T priority Critical patent/ATE22162T1/de
Publication of EP0098083A1 publication Critical patent/EP0098083A1/fr
Application granted granted Critical
Publication of EP0098083B1 publication Critical patent/EP0098083B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
    • F15B9/08—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor

Definitions

  • the invention relates to a servo-valve for operating a fluid-operable actuator, the servo-valve having a valve member, which is movable from an initial position in response to a change of position from a datum position of a part to be moved by the actuator and which supplies fluid from a fluid source to said actuator, thereby to cause a correcting movement to return said part to said datum position and the valve member to said initial position.
  • the servo-valve of the above defined type is characterised by means for creating a time delay from the commencement of the movement of the valve member from said initial position and to apply the correcting movement to said actuator at the end of said time delay.
  • valve member is movable in either of two opposite senses from said initial position in response to a corresponding change of position in one or other of a pair of opposite senses from said datum position of the part to be moved by said actuator.
  • the valve member may, for example, be rotatable within a cylinder having a pressurised fluid inlet port, a pair of supply ports each leading through a supply line via a flow restrictor to one or other side of pressure-responsive means controlling the actuator and spaced apart circumferentially of the cylinder at respective sides of the inlet port and a pair of exhaust ports spaced apart circumferentially of the cylinder at respective sides of the inlet port, whereby the valve member has three positions, namely a neutral position in which the inlet port is closed by the valve member and both supply ports or lines are connected to the corresponding exhaust port, a first operative position in which the inlet port is connected to one of the supply ports, the corresponding exhaust port is closed and the other supply port is connected with the other exhaust port and a second operative position in which the inlet port is connected to said other supply port, said other exhaust port is closed and said one supply port and said one exhaust port are connected together.
  • Each restrictor may be connected to a respective reservoir, said respective restrictor and reservoir being connected by a respective supply line to one or other end of said pressure-responsive means controlling the actuator.
  • the invention also includes the combination of a servo-valve as set out in either of the two immediately preceding paragraphs and the actuator, the actuator being a power fluid control valve having a valve member movable between two operative positions by said pressure-responsive means, the latter comprising a piston movable in a cylinder to which said supply lines are connected one at or adjacent each end of the cylinder to move the piston in one or other direction or to hold it in a neutral position according to the position of the valve member of the servo-valve, the piston being acted upon by return" springs acting in both directions in opposition to the fluid pressure delivered to the cylinder through the respective supply lines.
  • the actuator is preferably additionally controllable by a personally-operable control member. For example by a manually-operable control member.
  • the dumper truck 1 has a skip 2 which is supported by the chassis of the truck at 3 by a link 4 and by a suspension and levelling cylinder 5 at 6.
  • the desired normal position of the skip 2 is indicated by full lines.
  • High and low positions of the skip 2 are indicated in broken lines at 2A and 2B respectively.
  • the purpose of the servo-valve and actuator provided by this invention is to maintain the skip in its normal position in order to maintain substantially constant the clearance X with the ground under all load conditions.
  • a dwell of approximately five seconds is provided before the servo-valve will commence to control the actuator.
  • the actuator is shown at 8 and is a fluid operable control valve having a spool valve member 9 operable by a manual control lever 10.
  • the actuator is connected by fluid control lines 11 to the suspension and levelling cylinder 5.
  • This part of the actuator 8, the lines 11 and the cylinder 5 comprise a hydraulic suspension and levelling circuit of known type.
  • the operator can move the spool valve 9 by means of the lever 10 to raise and lower the skip 2.
  • servo-valve 12 is mounted on the chassis of the dumper truck 1.
  • the servo-valve 12 has a rotary valve member 13 (shown in Figures 2-4) having an operating arm 14 which is connected by a link 15 to the skip 2 at 16.
  • the arm 14 and hence the valve member 13 will be rotated anticlockwise and clockwise respectively from the neutral position, shown in Figure 2, which the valve member 13 occupies when the skip 2 is in its normal position.
  • the servo-valve 12 is connected by lines 17, 18 to a pair of ports 20, 21 in a control cylinder 19 in the actuator 8 containing a piston 22 mounted between the ports 20, 21 in the cylinder 19.
  • the piston 22 is mounted on the spool valve 9 of the actuator 8 or an extension of the spool valve so that as the piston 22 is moved in either direction by the servo-valve 12, the spool valve 9 of the actuator 8 will be moved to effect a levelling correction by the cylinder 5 on the skip 2.
  • the piston 22 is returned to the neutral position shown in Figure 2 after each correction movement, or manual adjustment by the lever 10, by a spring 23, 24 positioned inside the cylinder 19 and acting against the piston 22 in the return direction.
  • the pressurised fluid used in the servo-valve circuit and in the cylinder 19 is compressed air but could be oil.
  • the servo-valve 12 comprises a block having five ports circumferentially-spaced around a cylindrical chamber 25 containing the rotary valve member 13.
  • the five ports are an inlet port 26 connected to a source of compressed air (see Figures 2-4), a pair of exhaust ports 27, 28 positioned one each side of the port 26 circumferentially of the chamber 25, and a pair of supply ports 29, 30 positioned respectively between the inlet port 26 and the exhaust ports 27, 28.
  • the exhaust ports 27, 28 communicate with atmosphere.
  • the supply ports 29, 30 are connected by ducts 31, 32 respectively to reservoirs 33, 34 formed in the block of the servo-valve 12 and then to the respective lines 17, 18.
  • the reservoirs 33 and 34 are respectively connected by ducts 37, 38 to the chamber 25.
  • Each duct 31, 32 contains a fixed restrictor or orifice 35, 36 respectively.
  • the purpose of the restrictors 35, 36 is to provide the aforesaid delay in response of the servo-valve 12 to change of level of the skip 2.
  • the delay effected by the restrictors 35, 36 is substantially 5 seconds.
  • the arm 14 turns the valve member 13 in the clockwise direction, as shown in Figure 3.
  • the inlet port 26 is opened and admits compressed air into the part of the chamber 25 adjacent the supply port 29.
  • Air flows through the restrictor 35 to the reservoir 33 which is closed to exhaust.
  • the reservoir 34 is open through the adjacent portion of the chamber 25 to the exhaust port 28.
  • the reservoir 33 provides sufficient pressure to be transmitted through the line 17 to push the piston 22 to the left, as viewed in Figure 2, and so the actuator 8 will transmit pressure to the cylinder 5 to raise the skip 2.
  • the arm 14 turns the valve member 13 in the anticlockwise direction, as shown in Figure 4.
  • the inlet port 26 is opened and admits compressed air into the part of the chamber 25 adjacent the supply port 30.
  • Air flows through the restrictor 36 to the reservoir 34 which is closed to exhaust.
  • the reservoir 33 is open through the adjacent portion of the chamber 25 to the exhaust port 27.
  • the reservoir 34 provides sufficient pressure to be transmitted through the line 18 to push the piston 22 to the right, as viewed in Figure 2, and so the actuator 8 will transmit pressure to the cylinder 5 to lower the skip 2.
  • valve member can be sealed within the block, that is except for the provision of the ports.
  • sealing of the valve member can be effected is to use a floating sleeve between the valve member and the block, the sleeve being sealed within the block by elastically deformable seals, such as O-rings, but there being no seals between the valve member and the floating sleeve.
  • ducts 37, 38 provide a free-flow by-pass of the respective restrictors 35, 36 from the reservoirs 33, 34 on exhaust, without the need for a ball or other non-return valve in parallel with the respective restrictor.
  • servo-valve is applied to the controlling of the level of a dumper truck skip, it may be used in many other applications both as a means of restoring a part to a datum position from one direction only or from two opposite directions, one on each side of the datum position.
  • the servo-valve may be used to control an actuator automatically with or without the provision of manual control of the actuator.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Servomotors (AREA)
  • Vehicle Body Suspensions (AREA)
  • Valve Device For Special Equipments (AREA)

Claims (9)

1. Servo-distributeur (12) régulant une commande (8) actionnée par fluide sous pression. Le servo-distributeur comporte un boisseau mobile (13) se déplaçant de sa position initiale en réponse à un changement de la position de référence (X) d'un organe (2), cet organe étant lui- même actionné par la commande (8). Le servo-distributeur distribue à la commande le fluide provenant d'une source extérieure; ainsi, un déplacement correctif se produit pour ramener l'organe (2) à sa position de référence (X). Le servo-distributeur (12) comprend également un circuit temporisé (33 à 36) retardant le déplacement du boisseau (13) à partir de sa position initiale, le mouvement correctif de la commande (8) ne commençant qu'à la fin de la période temporisée.
2. Servo-distributeur sujet à la revendication 1 pour lequel le boisseau (13) se déplace, dans l'un ou l'autre sens, à partir de sa position initiale, en réponse à un changement de sens correspondant de l'organe actionné par la commande.
3. Servo-distributeur sujet à la revendication 2 pour lequel le boisseau (13) tourne dans un alésage (25) doté d'un orifice d'alimentation pressurisé (26) et de deux orifices de distribution (29 et 30), ces deux orifices étant en communication avec l'un ou l'autre des côtés d'un piston (22) par l'intermédiaire d'orifices de restriction de débit (35 et 36) et de passages (31 et 32). Ces orifices de distribution (29 et 30) sont radialement disposés de part et d'autre de l'orifice d'alimentation (26) dans l'alésage (25). Des orifices d'échappement (27 et 28) sont eux aussi disposés radialement de part et d'autre de l'orifice d'alimentation (26) dans l'alésage (25). Ainsi, le boisseau (13) peut occuper trois positions: un point mort pour lequel l'orifice d'alimentation (26) est fermé par le boisseau (13) et les orifices de distribution (29 et 30) sont en communication avec les orifices d'échappement correspondant (27 et 28); une première position de travail pour laquelle l'orifice d'alimentation (26) est en communication avec l'orifice de distribution (29), l'orifice d'échappement correspondant (27) étant fermé et l'autre orifice de distribution (30) étant en communication avec l'autre orifice d'échappement (28); une deuxième position de travail pour laquelle l'orifice d'alimentation (26) est en communication avec l'orifice de distribution (30), l'orifice d'échappement correspondant (28) étant fermé et l'orifice de distribution (29) étant en communication avec l'orifice d'échappement (27).
4. Servo-distributeur sujet à la revendication 3 pour lequel les orifices de restriction (35 et 36) sont en communication avec des réservoirs (33 et 44), les orifices et les réservoirs étant branchés, par l'intermédiaire de canalisations de distribution (17 et 18), de l'un et l'autre des côtés du piston (22) dont le rôle est de réguler la commande (8).
5. Combinaison d'un servo-distributeur (12) sujet à la revendication 3 ou 4 et d'une commande (8). Cette commande étant une vanne dotée d'un boisseau (9) pouvant se déplacer entre deux positions de travail en réponse à des changements de pression. Ce boisseau comporte un piston (22) se déplaçant dans un cylindre (19) sur lequel sont branchées les canalisations de distribution (17 et 18) de part et d'autre du piston. Cette distribution provoque le déplacement du piston (22) dans l'un ou l'autre sens ou le maintient au point mort selon la position du boisseau (13) du servo-distributeur (12). Le piston (22) est sollicité par des ressorts de rappel (23 et 24) agissant dans les deux sens en antagonisme avec la pression du fluide distribuée au cylindre (19) par les canalisations de distribution (17 et 18).
6. Combinaison sujète à la revendication 5 pour laquelle la commande (8) peut être complémen- tairement actionnée par un levier manuel (10).
7. Combinaison sujète à la revendication 5 ou 6 pour laquelle la commande (8) alimente l'un ou l'autre des côtés d'un vérin (5) dont le rôle est de maintenir la position de référence sous le contrôle du servo-distributeur (12), par l'intermédiaire de la commande (8).
8. Combinaison sujète à la revendication 7 pour laquelle le vérin (5) agit sur l'organe (2) d'un véhicule (1 ), organe dont le niveau doit être maintenu afin de conserver une garde au sol substantiellement constante.
9. Combinaison sujète à la revendication 8 pour laquelle le véhicule (1) est un déchargeur et l'organe (2) une benne.
EP83303522A 1982-06-24 1983-06-20 Servorégulateur de niveau Expired EP0098083B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83303522T ATE22162T1 (de) 1982-06-24 1983-06-20 Servo-niveauregler.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8218307 1982-06-24
GB8218307 1982-06-24

Publications (2)

Publication Number Publication Date
EP0098083A1 EP0098083A1 (fr) 1984-01-11
EP0098083B1 true EP0098083B1 (fr) 1986-09-10

Family

ID=10531247

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83303522A Expired EP0098083B1 (fr) 1982-06-24 1983-06-20 Servorégulateur de niveau

Country Status (3)

Country Link
EP (1) EP0098083B1 (fr)
AT (1) ATE22162T1 (fr)
DE (1) DE3366060D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0252186A1 (fr) * 1986-07-07 1988-01-13 Paul Van Malderen Serviette hygiénique
US6786130B2 (en) * 2002-10-25 2004-09-07 Deere & Company Directly actuated depth control

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE819942C (de) * 1948-11-23 1951-11-05 Kienzle App G M B H Villingen Hydraulisch oder pneumatisch betriebene Steuergeraete, insbesondere fuer Kraftheber von Schleppern
DE1430542A1 (de) * 1963-02-23 1968-12-12 Boge Gmbh Hydro-pneumatische Federung,insbesondere fuer Kraftfahrzeuge
FR1470073A (fr) * 1966-02-25 1967-02-17 Airoyal Engineering Company Distributeur rotatif à servo-commande
US4014533A (en) * 1975-07-11 1977-03-29 Vysoka Skola Strojni A Textilni Resilient load-bearing support for a vehicle
AU513695B2 (en) * 1976-02-20 1980-12-18 Ihara Chemical Ind Co Multiport cylindrical valve
DE2710440C2 (de) * 1977-03-10 1987-04-16 Baas Technik GmbH, 2000 Wedel Vorrichtung zur aktiven Schwingungsdämpfung

Also Published As

Publication number Publication date
ATE22162T1 (de) 1986-09-15
EP0098083A1 (fr) 1984-01-11
DE3366060D1 (en) 1986-10-16

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