US20070134103A1 - Hydraulic distributor comprising an input element with a scavenging valve - Google Patents
Hydraulic distributor comprising an input element with a scavenging valve Download PDFInfo
- Publication number
- US20070134103A1 US20070134103A1 US10/578,244 US57824404A US2007134103A1 US 20070134103 A1 US20070134103 A1 US 20070134103A1 US 57824404 A US57824404 A US 57824404A US 2007134103 A1 US2007134103 A1 US 2007134103A1
- Authority
- US
- United States
- Prior art keywords
- pump
- orifices
- communication
- pressure
- piston
- 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.)
- Abandoned
Links
Images
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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/005—Filling or draining of fluid systems
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
-
- 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
- F16K21/00—Fluid-delivery valves, e.g. self-closing valves
-
- 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
- F16K21/00—Fluid-delivery valves, e.g. self-closing valves
- F16K21/02—Fluid-delivery valves, e.g. self-closing valves providing a continuous small flow
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Multiple-Way Valves (AREA)
- Details Of Reciprocating Pumps (AREA)
- Safety Valves (AREA)
- Catching Or Destruction (AREA)
- Fluid-Pressure Circuits (AREA)
- Sliding Valves (AREA)
- Reciprocating Pumps (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Fluid-Driven Valves (AREA)
- Sampling And Sample Adjustment (AREA)
- Loading And Unloading Of Fuel Tanks Or Ships (AREA)
- Coating Apparatus (AREA)
Abstract
The input element comprises a body provided with openings respectively connecting to the pump, the reservoir and enabling information return to the pump. The body comprises a bore enabling communication between the openings and which are respectively joined to the pump and the reservoir, whereby a piston is mounted therein in order to establish said communication or not, whereby an extremity thereof is subjected to the pressure of the pump and the other extremity is subjected to pressure for information return and subjected to the pressure of a spring. The pressure exerted by the spring is substantially equal to the lift pressure of the pump and the piston and/or body comprise openings for communication of the chambers disposed on the pump side and reservoir side when the distributor is in rest position.
Description
- The subject of the present invention is a hydraulic distributor comprising an input element with a scavenging valve.
- This input element has a body provided with orifices for respective connection P to the pump, T to the reservoir and LS for a return of information to the pump, the body having a bore which can place into communication the orifices P and T respectively connected to the pump and to the reservoir, inside which bore is mounted a piston which is able to establish or not to establish this communication, one end of the piston being subjected to the pressure of the pump and the other end thereof being subjected to the pressure LS for the return of information and to the pressure of a spring. Arranged on the line LS for the return of information to the pump are a pressure limiter and a flow regulator. The pressure limiter is aimed at protecting the unit and the pump. The flow regulator is aimed at decompressing the line LS so that the pump can assume its rest position. This regulator discharges oil as a function of the calibration.
- The scavenging valve is intended to circulate oil from the pump to the reservoir when the distributor is in the rest position. The force exerted by the spring is significantly greater than the pump regulation value. Although the pump pressure regulation value is around 15 bar, the pressure exerted by the spring on the piston is around 25 bar.
- This results in sudden jolts during the start of a hydraulic movement, since it is the pressure of 25 bar that is taken into account instead of the theoretical pressure of 15 bar.
- The object of the invention is to allow the scavenging valve to operate with a low spring force, allowing sudden jolts to be avoided when controlling a hydraulic movement.
- To this end, according to the invention the pressure exerted by the spring is substantially equal to the delivery pressure of the pump, and the piston and/or the body have or has orifices for placing in communication the chambers situated on the pump P side and reservoir T side when the distributor is in the neutral position.
- By virtue of the orifices, the scavenging valve allows a portion of delivery oil from the pump to circulate when the distribution unit is not stressed.
- Advantageously, the cross section of the orifices allows the passage of a flow of between 10 and 15% of the maximum installed flow, under a pressure of around 15 bar.
- This arrangement makes it possible on the one hand to ensure a minimum flow in the neutral position of the distributor, under the delivery pressure of the pump, and to maintain a minimum flow in the exhaust line to ensure an optimum replenishing function.
- This circulation also makes it possible to maintain a fluid flow to bring about cooling of the fluid.
- This arrangement makes it possible to check, control and adjust the delivery pressure value of the pump in the neutral position of the distributor.
- As indicated above, the dynamic behavior of the machine is improved by virtue of progressive control, since the opening cross section of the slide valves is not subjected to large pressure variations.
- The overpressure function is still performed during sudden stoppages, and the valve is closed progressively as soon as the operating pressure becomes lower than the nominal pressure.
- According to a first embodiment, the orifices for placing in communication the chambers situated on the pump P side and reservoir T side consist of cutouts or slots opening into the outer surface of the piston or into the surface of the body delimiting the bore for the piston.
- According to another embodiment, the orifices for placing in communication the chambers situated on the pump P side and reservoir T side consist of at least one duct formed in the piston or in the body.
- Advantageously, the cross section of the orifices situated on the pump P side and reservoir T side varies as a function of the characteristics of the distribution slide valve.
- In any event, the invention will be better understood with the aid of the description which follows with reference to the appended schematic drawing which represents, by way of non-limiting example, an embodiment of this input element with a scavenging valve.
-
FIG. 1 is a view thereof in longitudinal section. -
FIG. 2 is a view of a curve illustrating the variation in the opening cross section of the distributor feeder as a function of the pressure supplied by the pump. -
FIG. 3 is a view of a curve illustrating the variation of fluid flow in the scavenging valve as a function of the pressure supplied by the pump. -
FIG. 1 represents the input element, the body of which is denoted by thereference 2. This body is provided with orifices for respective connection P to the pump, T to the reservoir and LS for a return of information to the pump. The body comprises abore 3 capable of placing in communication thechambers 4 and 5 respectively connected to the orifices P and T, which are connected to the pump and to the reservoir. Mounted slidably in thisbore 3 is apiston 6 having one end subjected to the pressure P of the pump and the other end subjected to the pressure LS for the return of information and to the pressure of aspring 7. - According to the essential characteristic of the invention, orifices 8 are formed in the
piston 6 so as to allow the passage of a leakage flow when the piston is in the closed position between thechambers 4 and 5. In the embodiment represented in the drawing, the orifices 8 consist of cutouts formed in the body of the piston and opening into the external face of the latter. - The
spring 7 is dimensioned so as to exert a pressure which is substantially equal to the delivery pressure of the pump. -
FIG. 2 represents a graph in which the abscissa axis illustrates the opening cross section of the feeder for supplying fluid to a user via the distributor, and the ordinate axis illustrates the fluid pressure supplied by the pump. The curve SD shows a linear change in the opening cross section of the feeder as a function of the pressure, while the curves SDl and SD2 are envelope curves showing the change in cross section as a function of the shape of the openings or cutouts delimiting the passage of fluid at the feeder. This graph also represents a curve QB showing the change in flow consumed by the scavenging valve as a function of the fluid pressure supplied by the pump. This curve shows that the flow QB consumed by the scavenging valve decreases when the opening cross section of the feeder increases. The flow QB consumed decreases at the same time as the pressure supplied by the pump. This pressure drop is due to losses in the pump/distributor circuit during opening of the distributor. -
FIG. 3 supplementsFIG. 2 , illustrating the variation of the flow QB consumed in the scavenging valve as a function of the pump pressure. It is possible to vary the flow consumed by the scavenging valve by adapting the cross section of the leakage orifices formed between the chamber 4 subjected to the hydraulic pressure and thechamber 5 connected to the reservoir. - As goes without saying, the invention is not restricted solely to the embodiment of this input element with a scanning valve, described above by way of example; on the contrary, it covers all the variants thereof. Thus, in particular, the orifices 8 formed in the piston could be replaced by orifices formed in the wall of the bore serving for the displacement of the piston, or else by ducts formed in the piston and/or ducts formed in the body of the element, without thereby departing from the scope of the invention.
Claims (10)
1. A hydraulic distributor comprising an input element with a scavenging valve, having a body provided with orifices for respective connection to the pump, to the reservoir and for a return of information to the pump, the body having a bore which can place in communication the orifices and respectively connected to the pump and to the reservoir, inside which bore is mounted a piston which is able to establish or not to establish this communication, one end of the piston being subjected to the pressure of the pump and the other end thereof being subjected to the pressure for the return of information and to the pressure of a spring, characterized in that the pressure exerted by the spring is substantially equal to the delivery pressure of the pump, and the piston and/or the body have or has orifices (8) for placing in communication the chambers situated on the pump side and reservoir side when the distributor is in the rest position.
2. The hydraulic distributor as claimed in claim 1 , characterized in that the cross section of the orifices allows the passage of a flow of between 10 and 15% of the maximum installed flow, under a pressure of around 15 bar.
3. The hydraulic distributor as claimed in claim 1 , characterized in that the orifices for placing in communication the chambers situated on the pump side and reservoir side consist of cutouts or slots opening into the outer surface of the piston or into the surface of the bodies delimiting the bore for the piston.
4. The hydraulic distributor as claimed in claim 1 , characterized in that the orifices for placing in communication the chambers situated on the pump side and reservoir side consist of at least one duct formed in the piston or in the body.
5. The hydraulic distributor as claimed in claim 1 , characterized in that the cross section of the orifices for placing in communication the chambers situated on the pump side and reservoir side varies as a function of the characteristics of the distribution slide valve.
6. The hydraulic distributor as claimed in claim 2 , characterized in that the orifices for placing in communication the chambers situated on the pump side and reservoir side consist of cutouts or slots opening into the outer surface of the piston or into the surface of the bodies delimiting the bore for the piston.
7. The hydraulic distributor as claimed in claim 2 , characterized in that the orifices for placing in communication the chambers situated on the pump side and reservoir side consist of at least one duct formed in the piston or in the body.
8. The hydraulic distributor as claimed in claim 2 , characterized in that the cross section of the orifices for placing in communication the chambers situated on the pump side and reservoir side varies as a function of the characteristics of the distribution slide valve.
9. The hydraulic distributor as claimed in claim 3 , characterized in that the cross section of the orifices for placing in communication the chambers situated on the pump side and reservoir side varies as a function of the characteristics of the distribution slide valve.
10. The hydraulic distributor as claimed in claim 4 , characterized in that the cross section of the orifices for placing in communication the chambers situated on the pump side and reservoir side varies as a function of the characteristics of the distribution slide valve.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0312920A FR2861816B1 (en) | 2003-11-04 | 2003-11-04 | HYDRAULIC DISPENSER COMPRISING AN INPUT MEMBER WITH SCANNING VALVE |
FR03/12920 | 2003-11-04 | ||
PCT/FR2004/002550 WO2005047710A1 (en) | 2003-11-04 | 2004-10-08 | Hydraulic distributor comprising an input with a scanning valve |
Publications (1)
Publication Number | Publication Date |
---|---|
US20070134103A1 true US20070134103A1 (en) | 2007-06-14 |
Family
ID=34429876
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/578,244 Abandoned US20070134103A1 (en) | 2003-11-04 | 2004-10-08 | Hydraulic distributor comprising an input element with a scavenging valve |
Country Status (10)
Country | Link |
---|---|
US (1) | US20070134103A1 (en) |
EP (1) | EP1680605B1 (en) |
JP (1) | JP2007513296A (en) |
KR (1) | KR101108581B1 (en) |
CN (1) | CN1867778A (en) |
AT (1) | ATE389117T1 (en) |
DE (1) | DE602004012436T2 (en) |
FR (1) | FR2861816B1 (en) |
PL (1) | PL1680605T3 (en) |
WO (1) | WO2005047710A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015058649A1 (en) * | 2013-10-25 | 2015-04-30 | 厦门松霖科技有限公司 | Flow switch device |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102207202B1 (en) * | 2019-03-26 | 2021-01-25 | 주식회사 신풍 | Oil pressure control system for sawing machine |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2774414A (en) * | 1950-04-26 | 1956-12-18 | Bendix Aviat Corp | Fuel flow equalizer valve |
US3467126A (en) * | 1966-03-21 | 1969-09-16 | Hydranamic Systems Corp | Hydraulic load compensating directional control valve |
US3723025A (en) * | 1970-10-23 | 1973-03-27 | Abex Corp | Variable bypass for fluid power transfer systems |
US4010610A (en) * | 1976-04-09 | 1977-03-08 | J. I. Case Company | Hydraulic load-sensing system |
US6170508B1 (en) * | 1998-07-07 | 2001-01-09 | Luk Getriebe-Systeme Gmbh | Fluid flow regulating valve and method |
US6681794B2 (en) * | 2000-05-23 | 2004-01-27 | Hitachi Construction Machinery Co., Ltd. | Unloading valve |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3477225A (en) * | 1967-06-14 | 1969-11-11 | Caterpillar Tractor Co | Hydrostatic transmission control system |
JPS597872B2 (en) * | 1977-03-14 | 1984-02-21 | 株式会社クボタ | pressure control device |
JPS53149243U (en) * | 1977-04-28 | 1978-11-24 | ||
JPS57116913A (en) * | 1981-01-10 | 1982-07-21 | Hitachi Constr Mach Co Ltd | Hydraulic drive unit for single rod type cylinder |
DE3205411C2 (en) * | 1982-02-16 | 1984-02-02 | Danfoss A/S, 6430 Nordborg | Ventilation device for a hydraulic system |
JP2819594B2 (en) * | 1989-03-13 | 1998-10-30 | 日立建機株式会社 | Hydraulic drive for civil and construction machinery |
JPH0322178U (en) * | 1989-07-17 | 1991-03-06 |
-
2003
- 2003-11-04 FR FR0312920A patent/FR2861816B1/en not_active Expired - Fee Related
-
2004
- 2004-10-08 KR KR1020067010827A patent/KR101108581B1/en not_active IP Right Cessation
- 2004-10-08 JP JP2006537342A patent/JP2007513296A/en active Pending
- 2004-10-08 WO PCT/FR2004/002550 patent/WO2005047710A1/en active IP Right Grant
- 2004-10-08 US US10/578,244 patent/US20070134103A1/en not_active Abandoned
- 2004-10-08 CN CNA2004800304529A patent/CN1867778A/en active Pending
- 2004-10-08 PL PL04818438T patent/PL1680605T3/en unknown
- 2004-10-08 DE DE602004012436T patent/DE602004012436T2/en active Active
- 2004-10-08 AT AT04818438T patent/ATE389117T1/en not_active IP Right Cessation
- 2004-10-08 EP EP04818438A patent/EP1680605B1/en not_active Not-in-force
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2774414A (en) * | 1950-04-26 | 1956-12-18 | Bendix Aviat Corp | Fuel flow equalizer valve |
US3467126A (en) * | 1966-03-21 | 1969-09-16 | Hydranamic Systems Corp | Hydraulic load compensating directional control valve |
US3723025A (en) * | 1970-10-23 | 1973-03-27 | Abex Corp | Variable bypass for fluid power transfer systems |
US4010610A (en) * | 1976-04-09 | 1977-03-08 | J. I. Case Company | Hydraulic load-sensing system |
US6170508B1 (en) * | 1998-07-07 | 2001-01-09 | Luk Getriebe-Systeme Gmbh | Fluid flow regulating valve and method |
US6681794B2 (en) * | 2000-05-23 | 2004-01-27 | Hitachi Construction Machinery Co., Ltd. | Unloading valve |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015058649A1 (en) * | 2013-10-25 | 2015-04-30 | 厦门松霖科技有限公司 | Flow switch device |
Also Published As
Publication number | Publication date |
---|---|
DE602004012436T2 (en) | 2009-04-02 |
KR101108581B1 (en) | 2012-01-31 |
DE602004012436D1 (en) | 2008-04-24 |
PL1680605T3 (en) | 2008-08-29 |
FR2861816B1 (en) | 2006-04-14 |
ATE389117T1 (en) | 2008-03-15 |
CN1867778A (en) | 2006-11-22 |
FR2861816A1 (en) | 2005-05-06 |
WO2005047710A1 (en) | 2005-05-26 |
JP2007513296A (en) | 2007-05-24 |
EP1680605A1 (en) | 2006-07-19 |
EP1680605B1 (en) | 2008-03-12 |
KR20060117963A (en) | 2006-11-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: BOSCH REXROTH D.S.I., FRANCE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:STEINHILBER, ARMIN;REEL/FRAME:017760/0391 Effective date: 20060510 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |