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WO1982002229A1 - Commande d'abaissement dans le cas d'un moteur en panne - Google Patents

Commande d'abaissement dans le cas d'un moteur en panne Download PDF

Info

Publication number
WO1982002229A1
WO1982002229A1 PCT/US1980/001704 US8001704W WO8202229A1 WO 1982002229 A1 WO1982002229 A1 WO 1982002229A1 US 8001704 W US8001704 W US 8001704W WO 8202229 A1 WO8202229 A1 WO 8202229A1
Authority
WO
WIPO (PCT)
Prior art keywords
pilot
control valve
conduit
valve
port
Prior art date
Application number
PCT/US1980/001704
Other languages
English (en)
Inventor
Tractor Co Caterpillar
Original Assignee
Melocik Kurt B
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 Melocik Kurt B filed Critical Melocik Kurt B
Priority to EP19810901573 priority Critical patent/EP0072793B1/fr
Priority to PCT/US1980/001704 priority patent/WO1982002229A1/fr
Priority to JP81501994A priority patent/JPS57501968A/ja
Priority to DE8181901573T priority patent/DE3071672D1/de
Priority to BE0/206599A priority patent/BE891185A/fr
Publication of WO1982002229A1 publication Critical patent/WO1982002229A1/fr

Links

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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F15B2211/3058—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve having additional valves for interconnecting the fluid chambers of a double-acting actuator, e.g. for regeneration mode or for floating mode
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3122—Special positions other than the pump port being connected to working ports or the working ports being connected to the return line
    • F15B2211/3127—Floating position connecting the working ports and the return line
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/355—Pilot pressure control
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • F15B2211/6054—Load sensing circuits having valve means between output member and the load sensing circuit using shuttle valves
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/77—Control of direction of movement of the output member
    • F15B2211/7708—Control of direction of movement of the output member in one direction only
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/863—Control during or prevention of abnormal conditions the abnormal condition being a hydraulic or pneumatic failure
    • F15B2211/8633—Pressure source supply failure

Definitions

  • This invention is directed to pilot operated control valve systems and particularly to those requiring a float condition plus a controlled lowering of a raised load upon loss of pilot pressure.
  • Some systems use a signal obtained from the load supporting end of an actuator to supply pressure to the pilot valve in response to the failure of the engine. However these systems do not provide a float condition of operation.
  • Other systems use a make-up valve which can be vented and thus opened to allow fluid to be passed to tank from a load supporting end of an actuator upon failure of the engine. However these systems do not provide an accurate control of the load during lowering because the check in the make-up may not respond quickly enough due to large amounts of fluid flowing therethrough.
  • the present invention is directed to overcoming one or more of the problems as set forth above. Disclosure of the Invention
  • a fluid system has a fluid source, a tank and an actuator.
  • the actuator has a first end and a second load supporting end.
  • a pilot operated control valve having first and second ends is connected to the source and the actuator.
  • a pilot control valve is connected to a source of pilot fluid and the first and second ends of the pilot operated control valve and movable between at least one operating position and a float position.
  • a make-up valve is connected between the first end of the actuator and the pilot operated control valve and has a vent line connected to the make-up valve and the pilot control valve- The vent line is in communication with the tank at the float position of the pilot control valve.
  • a means communicates the second load supporting end of the actuator to the tank through the vent line and the pilot control valve in response to loss of the source of pilot fluid and the pilot control valve being moved to the float position.
  • the figure is a schematic of an embodiment of the present invention.
  • a fluid system is generally indicated by reference numeral 10 and includes a fluid source, such as, a pump 12 and a pilot operated control valve 14 connected to the punp 12 by conduit 16.
  • the pilot operated control valve 14 has an inlet port 18 connected to the conduit 16, first and second outlet ports 20,22, an exhaust port 24 and a vent port 26.
  • the pilot operated control valve is movable between first, second and third positions "A", "B” and “C”. At the first position "A", the inlet port 18 is blocked from communication with the first and second outlet ports 20,22; the first and second outlet ports 20,22 are blocked from the exhaust port 24; and the vent port 26 is in communication with the exhaust port 24.
  • the inlet port 18 is in communication with the second outlet port 22, and the first outlet port 20 and the vent port 26 are in communication with the exhaust port 24.
  • the inlet port 18 is in communication with the first outlet port 20, and the second outlet port 22 and the vent port 26 are in communication with the exhaust port 24.
  • An actuator 28 having a first end 30 and a second load supporting end 32 is connected to the first and second outlet ports 20,22 of the pilot operated control valve 14, via conduits 34,36 respectively.
  • a tank 38 is connected to exhaust port 24 of the pilot operated control valve 24 via a conduit 40.
  • a make-up valve 42 having a vent passage 43 is connected to conduit 34 and vent port 26 of the pilot operated control valve 14 via conduits 44,46 respectively.
  • a pilot control valve 48 has a pilot inlet port 50, first and second pilot outlet ports 52,54, a pilot exhaust port 56, a pilot vent port 58, and an exhaust vent port 60.
  • the exhaust vent port 60 is connected to tank 38 by a conduit 61.
  • the pilot inlet port 50 is connected to a source of pilot fluid such as a pilot pump 62 via a conduit 64.
  • the first pilot outlet port 52 is connected to a first end 66 of the pilot operated control valve 14 via a conduit 68 and the second pilot outlet port 54 is connected to the second end 70 of pilot operated control valve 14 via a conduit 72.
  • the pilot control valve is movable between first, second, third and fourth positions "A'", "B''', "C”, "D".
  • first and second pilot outlet ports 52,54 are blocked from communication with the pilot inlet port 50 and in communication with the pilot exhaust port 56 and the pilot vent port 58 is blocked from communication with the exhaust vent port 60.
  • second pilot outlet- port 54 is in communication with the pilot inlet port 50, the first pilot outlet port 52 is in communication with the pilot exhaust port 56 and the pilot vent port 58 is blocked from the exhaust vent port 60.
  • the first pilot outlet port 52 is in communication with the pilot inlet port 50
  • the second pilot outlet port 54 is in communication with the pilot exhaust port 56 and the pilot vent port 58 is blocked from communication with the exhaust vent port 60.
  • the first pilot outlet port 52 is in communication with the pilot inlet port 50
  • the second pilot outlet port 54 is in communication witH pilot exhaust port 56
  • pilot vent port 58 is in communication with the exhaust vent port 60.
  • a vent line 74 consisting of first and second
  • .conduits 76,78 is connected to the vent passage 43 of the make-up valve 42 and the pilot vent port 58 of pilot control valve 48.
  • a means 79 for communicating the second load supporting end 32 of the actuator 28 to the tank 38 through the vent line 74 and the pilot control valve 48 is located in the vent line 74.
  • the means 79 includes a resolver valve 80 having a first inlet port 82 connected to the first conduit 76, a second inlet port 84 connected to the second supporting end 32 by the conduit 36 and a third conduit 88, and an outlet port 86 connected to second conduit 78.
  • the present invention has particular util ity in hydraulic systems that require a float condition during normal operation and lowering of a suspended load upon failure of the pilot source, such as loss of engine power.
  • pilot control valve 48 To raise the load, an operator moves pilot control valve 48 to the second position "B'" directing pilot fluid to the second end 70 of pilot operated control valve 14, shifting the pilot operated control valve 14 to the second position "B” thus directing fluid flow to the second load supporting end 32 of actuator 28.
  • the flow from the first end 30 returns to the tank 38 'via conduit 34 and pilot operated control valve 14.
  • the pilot control valve 48 is moved to the third position “C” causing the pilot operated control valve 14 to shift to the third position "C” thus directing fluid flow from the pump 12 to the first end 30 of actuator 28 and exhausting fluid from the second load supporting end 32 to tank 38 across the pilot operated control valve 14.
  • the pilot control valve 48 By moving the pilot control valve 48 to the fourth position "D", the. actuator 28 will be placed in a "float" condition.
  • the first end 30, the second load supporting end 32 and the pump 12 are simultaneously communicated to tank 38 thus allowing unrestricted movement of actuator 28.
  • the pilot operated control valve 14 In the float position "D" of the pilot control valve 48, the pilot operated control valve 14 is held in the third position “C” and the vent passage 43 of make-up valve 42 is communicated with tank 38 through the vent line 74, pilot vent port 58, exhaust vent port 60, and conduit 61.
  • the make-up valve 42 opens, allowing the first end 30 of the actuator 28 and the pump 12 to communicate with tank 38 through make-up valve 42 and vent port 26 and exhaust port 24 of pilot operated control valve 14 at the third position "C" .
  • the pilot operated control valve 14 automatically returns to the first position "A" which blocks the first and second outlet ports 20,22 from the tank 38. ⁇ y moving the pilot control valve 48 to the float position "D° the fluid in the second load supporting end is contr ⁇ llably passed to tank 38 via conduit 36, third conduit 88, resolver 80, second conduit 78 of vent line 74, pilot vent port 58 and exhaust vent port 60 of pilot control valve 48, and conduit 61.
  • the suspended load can be controllafaly lowered through the pilot control valve 48 in the event a loss of the pilot pump occurs while still maintaining a system requiring a float condition under normal operations.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

Un mecanisme (80) est prevu pour abaisser de maniere commandee un dispositif d'actionnement (28) lors de la defaillance d'une source (62) d'un fluide pilote dans un systeme de fluide necessitant une condition de fonctionnement en flottement. Un dispositif de resolution (80) est situe dans une canalisation d'event d'une vanne d'appoint et est connecte a une seconde extremite de support de charge (32) du dispositif d'actionnement (28) et est decharge de maniere commandee vers un reservoir (38) en deplacant une vanne de commande pilote (48) sur une quatrieme position (B). Ceci elimine le besoin de concevoir des systemes compliques ayant des vannes de retenue actionnees par le fluide pilote, qui sont plus difficiles a commander.
PCT/US1980/001704 1980-12-19 1980-12-19 Commande d'abaissement dans le cas d'un moteur en panne WO1982002229A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP19810901573 EP0072793B1 (fr) 1980-12-19 1980-12-19 Commande d'avaissement dans le cas d'un moteur en panne
PCT/US1980/001704 WO1982002229A1 (fr) 1980-12-19 1980-12-19 Commande d'abaissement dans le cas d'un moteur en panne
JP81501994A JPS57501968A (fr) 1980-12-19 1980-12-19
DE8181901573T DE3071672D1 (en) 1980-12-19 1980-12-19 Control for dead engine lower
BE0/206599A BE891185A (fr) 1980-12-19 1981-11-19 Systeme de reglage pour descente de charge

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/US1980/001704 WO1982002229A1 (fr) 1980-12-19 1980-12-19 Commande d'abaissement dans le cas d'un moteur en panne
WOUS80/01704801219 1980-12-19

Publications (1)

Publication Number Publication Date
WO1982002229A1 true WO1982002229A1 (fr) 1982-07-08

Family

ID=22154693

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1980/001704 WO1982002229A1 (fr) 1980-12-19 1980-12-19 Commande d'abaissement dans le cas d'un moteur en panne

Country Status (5)

Country Link
EP (1) EP0072793B1 (fr)
JP (1) JPS57501968A (fr)
BE (1) BE891185A (fr)
DE (1) DE3071672D1 (fr)
WO (1) WO1982002229A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4520625A (en) * 1982-03-04 1985-06-04 Kabushiki Kaisha Komatsu Seisakusho Hydraulic brake valve system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805678A (en) * 1972-04-17 1974-04-23 Caterpillar Tractor Co Hydraulic control system for load supporting hydraulic motors
US3840049A (en) * 1973-08-08 1974-10-08 Caterpillar Tractor Co Compact fluid motor control system with float position

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805678A (en) * 1972-04-17 1974-04-23 Caterpillar Tractor Co Hydraulic control system for load supporting hydraulic motors
US3840049A (en) * 1973-08-08 1974-10-08 Caterpillar Tractor Co Compact fluid motor control system with float position

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0072793A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4520625A (en) * 1982-03-04 1985-06-04 Kabushiki Kaisha Komatsu Seisakusho Hydraulic brake valve system

Also Published As

Publication number Publication date
EP0072793A1 (fr) 1983-03-02
DE3071672D1 (en) 1986-08-28
BE891185A (fr) 1982-03-16
EP0072793A4 (fr) 1984-04-27
EP0072793B1 (fr) 1986-07-23
JPS57501968A (fr) 1982-11-04

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