WO2007122463A2 - A pressure dissipater device for a hydraulic circuit - Google Patents

A pressure dissipater device for a hydraulic circuit Download PDF

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Publication number
WO2007122463A2
WO2007122463A2 PCT/IB2007/000713 IB2007000713W WO2007122463A2 WO 2007122463 A2 WO2007122463 A2 WO 2007122463A2 IB 2007000713 W IB2007000713 W IB 2007000713W WO 2007122463 A2 WO2007122463 A2 WO 2007122463A2
Authority
WO
WIPO (PCT)
Prior art keywords
cylinder
gap
rod
pipe
piston
Prior art date
Application number
PCT/IB2007/000713
Other languages
French (fr)
Other versions
WO2007122463A3 (en
Inventor
Massimiliano Lazzerini
Bernardo Celata
Original Assignee
Pierburg Pump Technology Italy S.P.A.
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 Pierburg Pump Technology Italy S.P.A. filed Critical Pierburg Pump Technology Italy S.P.A.
Publication of WO2007122463A2 publication Critical patent/WO2007122463A2/en
Publication of WO2007122463A3 publication Critical patent/WO2007122463A3/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/0473—Multiple-way safety valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
    • F04C14/223—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam

Definitions

  • the present invention relates to a pressure dissipater device for a hydraulic circuit.
  • the invention relates to a pressure dissipater device for a circuit comprising a variable displacement vane pump without because of this loosing in generality.
  • variable displacement vane pumps comprise a main body presenting a cavity in which there may be displaced a ring within which a rotor which turns around a fixed axis is accommodated.
  • the rotor is provided with a plurality of vanes, one end of which rests, during rotation, against the internal surface of the ring.
  • the ring is subjected to the action of means adapted to displace it according to a driving pressure between a centred position coaxial to the axis of the rotor, a position in which there is no pumping, and a predetermined eccentric position in relation to the rotation axis of the rotor itself.
  • Vane pumps of the aforesaid type are currently used to pump various fluids, in the case in point oil in an internal combustion engine.
  • the circuits of the known art comprise at least one pair of pressure dissipaters which, as described in patent application BO2003A000528 by the applicant, are capable of varying the eccentricity of the pump.
  • the two dissipaters are two physically distinct devices and consist in a first fixed structure bottleneck dissipater and a second dissipater consisting in a sliding spool valve the position of which depends on the pumped liquid pressure, DISCLOSURE OF INVENTION
  • a pressure dissipater device comprising a cylinder in which there are obtained a first and a second gap arranged in reciprocally misaligned manner, a piston adapted to fluid-tightly slide within said cylinder and comprising at least one shutter portion and a rod, and elastic means adapted to force said piston into a closed position of said first gap; said device being characterised in that in said rod there are obtained a pipe presenting an inlet opening of liquid of a hydraulic circuit, and a bottleneck opening adapted to connect said conduit to a space comprised between the cylinder and the rod; said first gap being adapted to be either opened or closed, by the action of the piston and, said second gap being always open.
  • FIG. 1 shows a preferred embodiment of the pressure dissipater according to the present invention in an operative position thereof
  • figure 2 shows the pressure dissipater in figure 1 in another operative position thereof.
  • numeral 1 indicates as a whole a pressure dissipater according to the present invention.
  • Pressure dissipater 1 comprises an external cylinder 2 and a piston 3 adapted to fluid-tightly slide within cylinder 2.
  • a first 4 and a second gap 5 arranged reciprocally misaligned and in diametrically opposite position to each other.
  • Piston 3 comprises, in turn, a shutter portion 6, and a fitting portion 7 joined together by a rod 8. While the two portions 6 and 7 have a cross section equal to that of cylinder 2, rod 8 has a smaller cross section than that of cylinder 2. In order words, while portions 6 and 7 fluid-tightly slide within cylinder 2, a space S in use occupied by the hydraulic circuit liquid is defined between rod 8 and cylinder 2.
  • Shutter portion 6 comprises a cup-shaped body 9 defining a seat 10 in which there is accommodated a coil spring 16 adapted to be compressed between a portion of cylinder 2 and a bottom wall 9a of the cup-shaped body S.
  • dead pipe 11 which extends into fitting portion 7 and into rod 8 coaxially thereto.
  • dead pipe 11 presents a cavity 12 obtained in fitting portion 7 and communicating towards the outside through an inlet .
  • opening 11a obtained in an end surface 7a of fitting portion 7.
  • Cavity 12 is adapted to be connected to a hydraulic circuit liquid pipe.
  • Cavity 12 due to its connecting function, presents a larger diameter than that of the remaining part of the pipe extending in rod 8.
  • Pipe 11 presents a communication opening 13 obtained in rod 8 and presenting an axis perpendicular to that of dead pipe 11.
  • Communication, opening 13 is adapted to put dead pipe 11 itself into communication with space S comprised between cylinder 2 and rod 8.
  • Communication opening 13 is defined by a conical wall 14 the smaller diameter portion o£ which faces within dead conduit 11.
  • Pressure dissipater 1 further comprises a filter 15 accommodated within cavity 12 and adapted to filter the hydraulic circuit liquid let into dead pipe 11.
  • the pumped liquid exerts a predetermined pressure on the surface of the whole consisting of cavity 12 and dead pipe 11.
  • first gap 4 is closed by shutter portion 6.
  • gap 5 is connected to a control chamber of the variable displacement vane pump.
  • device 1 incorporates in its structure both a bottleneck dissipater device identified by communication opening 13, and the sliding spool valve device. Moreover, device 1 further incorporates filter 15 thus reducing the dimensions of the liquid circuit and simplifying the components ,

Abstract

A pressure dissipater device (1) consisting of a cylinder (2) in which there are obtained a first (4) and a second (5) gap arranged in reciprocally misaligned manner, a piston (3) adapted to fluid-tightly slide within the cylinder (2) and having at least one shutter portion (6) and a rod (8) / and elastic means (16) adapted to force the piston (3) into a closed position of the first gap (4); in the rod (8) there are obtained a pipe (11) presenting a hydraulic circuit liquid inlet opening (lla), and a bottleneck opening (13) adapted to connect the pipe (11) to a space (S) comprised between the cylinder (2) and the rod (8); the first gap (4) is either opened or closed by the action of the piston (3) while the second gap (5) is always open.

Description

A PRESSURE DISSIPATER DEVICE FOR A HYDRAULIC CIRCUIT
TECHNICAL FIELD
The present invention relates to a pressure dissipater device for a hydraulic circuit.
Specifically, the invention relates to a pressure dissipater device for a circuit comprising a variable displacement vane pump without because of this loosing in generality. BACKGROUND ART
As it is known, variable displacement vane pumps comprise a main body presenting a cavity in which there may be displaced a ring within which a rotor which turns around a fixed axis is accommodated. The rotor is provided with a plurality of vanes, one end of which rests, during rotation, against the internal surface of the ring.
The ring is subjected to the action of means adapted to displace it according to a driving pressure between a centred position coaxial to the axis of the rotor, a position in which there is no pumping, and a predetermined eccentric position in relation to the rotation axis of the rotor itself.
Vane pumps of the aforesaid type are currently used to pump various fluids, in the case in point oil in an internal combustion engine. In order to limit the indiscriminate increase of the pumped liquid flow rate according to the rotor speed, the circuits of the known art comprise at least one pair of pressure dissipaters which, as described in patent application BO2003A000528 by the applicant, are capable of varying the eccentricity of the pump. The two dissipaters are two physically distinct devices and consist in a first fixed structure bottleneck dissipater and a second dissipater consisting in a sliding spool valve the position of which depends on the pumped liquid pressure, DISCLOSURE OF INVENTION
It is the object of the present invention to make a single pressure device the technical features of which allow to incorporate the two dissipaters of the known art. It is the object of the present invention to provide a pressure dissipater device comprising a cylinder in which there are obtained a first and a second gap arranged in reciprocally misaligned manner, a piston adapted to fluid-tightly slide within said cylinder and comprising at least one shutter portion and a rod, and elastic means adapted to force said piston into a closed position of said first gap; said device being characterised in that in said rod there are obtained a pipe presenting an inlet opening of liquid of a hydraulic circuit, and a bottleneck opening adapted to connect said conduit to a space comprised between the cylinder and the rod; said first gap being adapted to be either opened or closed, by the action of the piston and, said second gap being always open.
BRIEF DESCRIPTION OF THE DRAWINGS
The following example is provided by way of non- limiting illustration for a better understanding of the invention with the aid of the figures in the accompanying drawing, in which:
- figure 1 shows a preferred embodiment of the pressure dissipater according to the present invention in an operative position thereof; and
- figure 2 shows the pressure dissipater in figure 1 in another operative position thereof.
BEST MODE FOR CARRYING OUT THE INVENTION
In figure 1, numeral 1 indicates as a whole a pressure dissipater according to the present invention.
Pressure dissipater 1 comprises an external cylinder 2 and a piston 3 adapted to fluid-tightly slide within cylinder 2. In cylinder 2 there are obtained a first 4 and a second gap 5 arranged reciprocally misaligned and in diametrically opposite position to each other.
Piston 3 comprises, in turn, a shutter portion 6, and a fitting portion 7 joined together by a rod 8. While the two portions 6 and 7 have a cross section equal to that of cylinder 2, rod 8 has a smaller cross section than that of cylinder 2. In order words, while portions 6 and 7 fluid-tightly slide within cylinder 2, a space S in use occupied by the hydraulic circuit liquid is defined between rod 8 and cylinder 2.
Shutter portion 6 comprises a cup-shaped body 9 defining a seat 10 in which there is accommodated a coil spring 16 adapted to be compressed between a portion of cylinder 2 and a bottom wall 9a of the cup-shaped body S.
In piston 3 there is obtained a dead pipe 11 which extends into fitting portion 7 and into rod 8 coaxially thereto. Specifically, dead pipe 11 presents a cavity 12 obtained in fitting portion 7 and communicating towards the outside through an inlet . opening 11a obtained in an end surface 7a of fitting portion 7. Cavity 12 is adapted to be connected to a hydraulic circuit liquid pipe. Cavity 12, due to its connecting function, presents a larger diameter than that of the remaining part of the pipe extending in rod 8. Pipe 11 presents a communication opening 13 obtained in rod 8 and presenting an axis perpendicular to that of dead pipe 11. Communication, opening 13 is adapted to put dead pipe 11 itself into communication with space S comprised between cylinder 2 and rod 8. Communication opening 13 is defined by a conical wall 14 the smaller diameter portion o£ which faces within dead conduit 11.
Pressure dissipater 1 further comprises a filter 15 accommodated within cavity 12 and adapted to filter the hydraulic circuit liquid let into dead pipe 11.
In use, ' the pumped liquid exerts a predetermined pressure on the surface of the whole consisting of cavity 12 and dead pipe 11. When, as shown in figure 1, the pressure exerted by the liquid is lower than a predetermined preload value of the spring, first gap 4 is closed by shutter portion 6.
In such a situation, the liquid, once crossed filter 15, enters in dead pipe 11, through communication opening 13 to enter space S comprised between cylinder 2 and rod 8, and exits device 1 through gap 5. Specifically, in the hydraulic circuits to which the description refers, gap 5 is connected to a control chamber of the variable displacement vane pump.
When, as shown in figure 2, the pressure exerted by the liquid is higher than the pressure value established by the preload of the spring, piston 3 starts to slide within cylinder 2 compressing the spring until first gap 4 is in σonnmunication with space S comprised between cylinder 2 and rod 8- In this situation, the liquid, once crossed filter 15, enters in dead pipe 11 and exits through communication opening 13 to enter space S where it combines with other liquid from gap 5 guided by the pressure gradient. At this point, the liquid present in space S will exit device 1 through gap 4.
In this manner, it is possible to decrease the pressure in the control chamber of the vane pump connected to gap 5 and, consequently, to modify the eccentricity of the cylinder of the pump itself. As directly shown in the description above, device 1 incorporates in its structure both a bottleneck dissipater device identified by communication opening 13, and the sliding spool valve device. Moreover, device 1 further incorporates filter 15 thus reducing the dimensions of the liquid circuit and simplifying the components ,

Claims

1. A pressure dissipater device (1) comprising a cylinder (2) in which there are obtained a first (4) and a second (5) gap arranged in reciprocally misaligned manner, a piston (3) adapted to fluid-tightly slide within said cylinder (2) and comprising at least one shutter portion (6) and a rod (8), and elastic means (16) adapted to force said piston (3) into a closed position of said first gap (4); said device being characterised in that in said rod (8) there are obtained a pipe (H) presenting a hydeaulic circuit liquid inlet opening
(Ha) , and a bottleneck opening (13) adapted to connect said pipe (11) to a space (S) comprised between the cylinder (2) and the rod (8)? said first gap (4) being adapted to be either opened or closed by the action of the piston (3) and said second gap (5) being always open.
2. A dissipater device according to one of the preceding claims,, characterised in that it comprises a filter (15) arranged in said pipe (11) .
3. A dissipater device according to claim 1 or 2, characterised in that said bottleneck opening (13) is defined by a conical wall (14) the smaller diameter portion of which faces within said pipe (11) ,
4. A dissipater device according to claim 3, characterised in that said piston comprises a fitting portion (7) adapted to fluid-tightly slide in said cylinder (2) and joined to said shutter portion by means of said rod (8); in said second portion (7) there being obtained ≤aid inlet opening (Ha) of said pipe (11) .
5. A dissipater device according to any of the preceding claims, characterised in that said shutter portion (6) comprises a cup-shaped body (9) defining a seat (10) for a coil spring (16) .
PCT/IB2007/000713 2006-03-23 2007-03-22 A pressure dissipater device for a hydraulic circuit WO2007122463A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO20060206 ITBO20060206A1 (en) 2006-03-23 2006-03-23 PRESSURE HEATER FOR A HYDRAULIC CIRCUIT.
ITBO2006A000206 2006-03-23

Publications (2)

Publication Number Publication Date
WO2007122463A2 true WO2007122463A2 (en) 2007-11-01
WO2007122463A3 WO2007122463A3 (en) 2008-02-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2007/000713 WO2007122463A2 (en) 2006-03-23 2007-03-22 A pressure dissipater device for a hydraulic circuit

Country Status (2)

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IT (1) ITBO20060206A1 (en)
WO (1) WO2007122463A2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103256413A (en) * 2013-03-07 2013-08-21 荆门市广恒机电设备有限公司 Water pressure safety relief valve for high pressure water mist fire extinguishing system
JP2019116924A (en) * 2017-12-27 2019-07-18 日本電産トーソク株式会社 Relief valve
JP2019116923A (en) * 2017-12-27 2019-07-18 日本電産トーソク株式会社 Relief valve

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106286925B (en) * 2016-08-17 2018-11-16 中国航空工业集团公司西安飞行自动控制研究所 A kind of novel voltage stabilizing overflow valve
GB2562044B (en) * 2017-05-02 2020-03-18 Delphi Tech Ip Ltd Flushable low pressure regulator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3128667A1 (en) * 1981-07-20 1983-01-27 Steyr-Daimler-Puch AG, 1010 Wien Pressure-relief valve for hydraulic systems
EP0438933A2 (en) * 1990-01-22 1991-07-31 Bendix Espana S.A. Relief valve for hydraulic fluid
WO1994015084A1 (en) * 1992-12-23 1994-07-07 Lucas Industries Plc Flow distributor valve
EP1350957A1 (en) * 2000-12-04 2003-10-08 Toyoda Koki Kabushiki Kaisha Variable displacement pump
WO2005026553A1 (en) * 2003-09-12 2005-03-24 Pierburg S.P.A. Pumping system employing a variable-displacement vane pump

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3128667A1 (en) * 1981-07-20 1983-01-27 Steyr-Daimler-Puch AG, 1010 Wien Pressure-relief valve for hydraulic systems
EP0438933A2 (en) * 1990-01-22 1991-07-31 Bendix Espana S.A. Relief valve for hydraulic fluid
WO1994015084A1 (en) * 1992-12-23 1994-07-07 Lucas Industries Plc Flow distributor valve
EP1350957A1 (en) * 2000-12-04 2003-10-08 Toyoda Koki Kabushiki Kaisha Variable displacement pump
WO2005026553A1 (en) * 2003-09-12 2005-03-24 Pierburg S.P.A. Pumping system employing a variable-displacement vane pump

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103256413A (en) * 2013-03-07 2013-08-21 荆门市广恒机电设备有限公司 Water pressure safety relief valve for high pressure water mist fire extinguishing system
JP2019116924A (en) * 2017-12-27 2019-07-18 日本電産トーソク株式会社 Relief valve
JP2019116923A (en) * 2017-12-27 2019-07-18 日本電産トーソク株式会社 Relief valve
JP7040004B2 (en) 2017-12-27 2022-03-23 日本電産トーソク株式会社 Relief valve

Also Published As

Publication number Publication date
ITBO20060206A1 (en) 2007-09-24
WO2007122463A3 (en) 2008-02-07

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