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EP0072793B1 - Commande d'avaissement dans le cas d'un moteur en panne - Google Patents

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

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Publication number
EP0072793B1
EP0072793B1 EP19810901573 EP81901573A EP0072793B1 EP 0072793 B1 EP0072793 B1 EP 0072793B1 EP 19810901573 EP19810901573 EP 19810901573 EP 81901573 A EP81901573 A EP 81901573A EP 0072793 B1 EP0072793 B1 EP 0072793B1
Authority
EP
European Patent Office
Prior art keywords
pilot
control valve
valve
conduit
port
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
EP19810901573
Other languages
German (de)
English (en)
Other versions
EP0072793A1 (fr
EP0072793A4 (fr
Inventor
Kurt B. Melocik
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.)
Caterpillar Inc
Original Assignee
Caterpillar Inc
Caterpillar Tractor Co
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 Caterpillar Inc, Caterpillar Tractor Co filed Critical Caterpillar Inc
Publication of EP0072793A1 publication Critical patent/EP0072793A1/fr
Publication of EP0072793A4 publication Critical patent/EP0072793A4/fr
Application granted granted Critical
Publication of EP0072793B1 publication Critical patent/EP0072793B1/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
    • 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.
  • a system such as that in the U.S. Patent 3,840,049 teaches a system having a float condition and a mechanism for providing a lowering of a load under dead engine conditions, but this system also requires venting behind the make-up and having to control the degree of opening of the make-up during lowering.
  • the system is also more complex in that it requires two different make-up valves and a selector valve responsive to pilot pressure to provide both float and dead engine lower.
  • the present invention is directed to overcoming one or more of the problems as set forth above.
  • a fluid system as set forth in the first part of claim 1 is characterised by the features of the second part of claim 1.
  • Preferred embodiments of the invention are disclosed in dependant claim 2.
  • Figure 1 is a schematic of an embodiment of the present invention
  • Figure 2 explains further the make-up valve of Fig. 1.
  • 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 pump 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 268 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 shuttle valve (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 utility 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 actuator 28 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.
  • the pilot control valve 48 By moving the pilot control valve 48 to the float position "D" the fluid in the second load supporting end is controllably passed to tank 38 via conduit 36, third conduit 88, shuttle valve 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 controllably 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.
  • the make-up valve 42 is of the type disclosed in US-A-3 840 049.
  • the normally closed make-up valve member is urged to its closed position by a spring and a pilot pressure.
  • the pilot chamber is in communication with the actuator's first end 30 through a throttle and can be vented through pilot valve 48 an vent line 74.
  • the make-up valve member is urged to its opened position by the actuator's first end pressure and the tank pressure.

Landscapes

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

Claims (2)

1. Système de fluide (10) comprenant une source de fluide (12); un réservoir (38); un dispositif de commande (28) possédant une première extrémité (30) et une seconde extrémité (32) supportant une charge; une soupape de commande principale pilotée (14) possédant des première et seconde extrémités (66, 70) et raccordée à ladite source (12), audit réservoir (38) et auxdites première et seconde extrémités (30, 32) du dispositif de commande (28); une source de fluide pilote (62); une soupape de commande pilote (48) raccordée à ladite source de fluide pilote (62), audit réservoir (38) et auxdites première et seconde extrémités (66, 70) de la soupape de commande principale (14) et mobile entre au moins une position de service (B', C') et une position de flottement (D); une soupape de compensation (42) raccordée entre la première extrémité (30) du dispositif de commande (28) et un orifice d'aération (26) de la soupape de commande principale (14): et une conduite d'aération (74) raccordée à la soupape de compensation (42) et à la soupape de commande pilote (48) et communiquant avec le réservoir (38) en position de flottement (D) de la soupape de commande pilote (48); caractérisé par un moyen (79) pour faire communiquer la seconde extrémité (32), supportant la charge, du dispositif de commande (28) avec le réservoir (38) par l'intermédiaire de ladite conduite d'aération (74) et de ladite soupape de commande pilote (48) et pour empêcher la mise à l'air libre de la soupape de compensation (42) en réponse à une perte de ladite source de fluide pilote (62) et ladite soupape de commande pilote (48) étant passée à ladite position de flottement (D).
2. Système de fluide (10), tel que défini dans la revendication 1, dans lequel ladite conduite d'aération (74) comporte des premier et second conduits (76, 78), ledit premier conduit étant raccordé à ladite soupape de compensation (42) et ledit second conduit (78) étant raccordé à ladite soupape de commande pilote (48), dans lequel ledit moyen (79) comporte une soupape à va-et-vient (80) et un troisième conduit (88), ledit troisième conduit (88) étant raccordé à ladite seconde extrémité 32 supportant la charge et ladite soupape à va-et-vient (80) étant située dans ladite conduite d'aération (74) entre lesdits premier et second conduits (76, 78) et possédant un premier orifice d'entrée (82) raccordé audit premier conduit (76), un second orifice d'entrée (84) raccordé audit troisième conduit (88) et un orifice d'échappement (86) raccordé audit second conduit (78).
EP19810901573 1980-12-19 1980-12-19 Commande d'avaissement dans le cas d'un moteur en panne Expired EP0072793B1 (fr)

Applications Claiming Priority (1)

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

Publications (3)

Publication Number Publication Date
EP0072793A1 EP0072793A1 (fr) 1983-03-02
EP0072793A4 EP0072793A4 (fr) 1984-04-27
EP0072793B1 true EP0072793B1 (fr) 1986-07-23

Family

ID=22154693

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810901573 Expired EP0072793B1 (fr) 1980-12-19 1980-12-19 Commande d'avaissement 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)

Families Citing this family (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

Family Cites Families (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

Also Published As

Publication number Publication date
WO1982002229A1 (fr) 1982-07-08
EP0072793A1 (fr) 1983-03-02
DE3071672D1 (en) 1986-08-28
BE891185A (fr) 1982-03-16
EP0072793A4 (fr) 1984-04-27
JPS57501968A (fr) 1982-11-04

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