DE202004008847U1 - Hydraulic power steering has pressure and/or flow regulated pump, with volume flow adjustable independently of generated pressure, and pressure reducing valves as electromechanical or hydraulically controlled 3-way valves - Google Patents
Hydraulic power steering has pressure and/or flow regulated pump, with volume flow adjustable independently of generated pressure, and pressure reducing valves as electromechanical or hydraulically controlled 3-way valves Download PDFInfo
- Publication number
- DE202004008847U1 DE202004008847U1 DE202004008847U DE202004008847U DE202004008847U1 DE 202004008847 U1 DE202004008847 U1 DE 202004008847U1 DE 202004008847 U DE202004008847 U DE 202004008847U DE 202004008847 U DE202004008847 U DE 202004008847U DE 202004008847 U1 DE202004008847 U1 DE 202004008847U1
- Authority
- DE
- Germany
- Prior art keywords
- pressure
- valve
- power steering
- reducing valves
- hydraulic power
- 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 - Lifetime
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
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F15B11/05—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive
- F15B11/055—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive by adjusting the pump output or bypass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/065—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/09—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by means for actuating valves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
- B62D6/08—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque
-
- 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
- F15B21/08—Servomotor systems incorporating electrically operated control means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Power Steering Mechanism (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft eine hydraulische Servolenkung mit den Merkmalen des Oberbegriffs des Anspruch 1.The The present invention relates to a hydraulic power steering with the features of the preamble of claim 1.
Eine
gattungsgemäße hydraulische
Servolenkung ist aus der
Der Erfindung liegt die Aufgabe zugrunde, die gattungsgemäße hydraulische Servolenkung dahingehend zu erweitern, dass auf den Druckspeicher verzichtet werden kann.Of the Invention is based on the object, the generic hydraulic To extend power steering to the effect that waives the accumulator can be.
Diese Aufgabe wird erfinderisch mit einer hydraulischen Servolenkung mit den Merkmalen des Anspruchs 1 gelöst.These Task is inventive with a hydraulic power steering with the features of claim 1 solved.
Der Erfindung liegt der Erfindungsgedanke zugrunde, dass durch den Einsatz einer druckgeregelten Servopumpe bzw. einer druck-/durchflußgeregelten Pumpe vorteilhaft auf den Druckspeicher verzichtet werden kann, wodurch die erfindungsgemäße hydraulische Servolenkung nicht nur kleiner baut, sondern auch weniger Teile aufweist und somit weniger störanfällig und leichter zu montieren ist.Of the Invention is based on the idea of the invention that through the use a pressure-controlled servo pump or a pressure / flow-controlled Pump can be advantageously dispensed with the accumulator, whereby the inventive hydraulic Power steering not only builds smaller, but also fewer parts and thus less susceptible to interference and easier to assemble.
Die druckgeregelte Servopumpe ist vorteilhaft eine regelbare Flügelzellenpumpe, welche sich durch einen hohen Wirkungsgrad sowie eine hohe Dynamik auszeichnet. Die Flügelzellenpumpe weist idR einen Hubring in exzentrischer Lage zum Rotor auf. Wird der Rotor mit den Flügeln gedreht, so vergrößern sich zunächst die Förderzellen, es entsteht ein Unterdruck. Das Druckmedium wird über einen Anschluß angesaugt. In der weiteren Drehung verkleinern sich die Förderzellen wieder, wonach das Medium über den Auslaß in die Druckleitung ausgeschoben wird. Erreicht der Druck in der Auslaßleitung den am Druckregler vorgegebenen Wert, so wird der Reglerkolben entlastet und die Pumpe regelt ab. Sinkt der Systemdruck wegen größeren Förderstrombedarfs unter den vorgegebenen Druckwert, so wird über den Reglerkolben die Exzentrizität des Hubringes zum Rotor vergrößert, wodurch die Pumpe auf regelt. Im abgeregelten Zustand nimmt die Flügelzellenpumpe lediglich ca. 1/5 ihrer Nennleistung bei maximaler Fördermenge auf, wodurch der Einsatz der regelbaren Flügelzellenpumpe zur vorteilhaften Reduzierung des Energiebedarfs der Lenkung beiträgt.The pressure-controlled servo pump is advantageous an adjustable vane pump, which is characterized by high efficiency and high dynamics distinguished. The vane pump usually has a cam ring in eccentric position to the rotor. Becomes the rotor with the wings turned, so enlarge first the delivery cells, it creates a negative pressure. The pressure medium is sucked in via a connection. In the further rotation, the conveyor cells shrink again, after which the medium over the Outlet in the pressure line is pushed out. If the pressure in the outlet line reaches the at the pressure regulator predetermined value, the regulator piston is relieved and the pump regulates. The system pressure drops because of larger flow requirements below the specified pressure value, the eccentricity of the lifting ring is via the regulator piston increased to the rotor, thereby the pump regulates. In the regulated state takes the vane pump only about 1/5 of their rated output at maximum flow on, whereby the use of the controllable vane pump for advantageous Reducing the energy consumption of the steering contributes.
Weitere vorteilhafte Ausgestaltungen ergeben sich durch die Merkmale der Unteransprüche.Further advantageous embodiments result from the features of Dependent claims.
Solange keine Lenkunterstützung gefordert wird, liefert die Servopumpe lediglich den Systemdruck, wobei nur ein sehr geringer Volumenstrom zur Leckagekompensation fliest. Hierdurch ist vorteilhaft die Leistungsaufnahme sehr gering. Sobald vom Fahrer eine Lenkunterstützung angefordert wird, werden die Druckminderventile entsprechend angesteuert, wodurch ein benötigter Druck im jeweiligen Arbeitsraum des Stellaggregates eingeregelt wird.So long no steering assistance demanded, the power steering pump delivers only the system pressure, where only a very small volume flow for leakage compensation fliest. As a result, the power consumption is very low. Once the driver is requested a steering assistance will be the pressure reducing valves are controlled accordingly, whereby a required pressure is adjusted in the respective working space of the actuator.
In einer weiteren Ausgestaltung der Erfindung werden die elektromechanisch Druckminderventile durch vorgesteuerte Druckminderventile ersetzt. Der Volumenstrom zur Ansteuerung der Druckminderventile kann hierbei von einem Hydraulikventil, z.B. einem mechanischen Drehschieber oder einem Linearschieberventil, erzeugt werden. Um das Hydraulikventil mit einem konstanten Volumenstrom zu versorgen kann optional ein Strombegrenzungsventil im Zulauf des Hydraulikventils angeordnet werden. Dieser konstante Volumenstrom zur hydraulischen Betätigung des Hydraulikventils ist sehr viel kleiner als der zur Betätigung der Servolenkung benötigte Volumenstrom. Selbst bei Verwendung eines „Open-Center"-Ventils ist der Energieverbrauch des Systems deutlich geringer als bei einer herkömmlichen „Open-Center"-Lenkung, da der Steuervolumenstrom deutlich reduziert wurde.In In a further embodiment of the invention, the electromechanical Pressure reducing valves replaced by pilot operated pressure reducing valves. The volume flow for controlling the pressure reducing valves can here from a hydraulic valve, e.g. a mechanical rotary valve or a linear slide valve. To the hydraulic valve can supply with a constant volume flow optional Current limiting valve arranged in the inlet of the hydraulic valve become. This constant volume flow for hydraulic actuation of the Hydraulic valve is much smaller than that for operating the Power steering needed Volume flow. Even when using an "open-center" valve is the Energy consumption of the system significantly lower than in a conventional "open-center" steering, as the Control volume flow was significantly reduced.
Das vorteilhafte Vorsehen eines Servodrosselventils im Rücklauf der Druckminderventile erlaubt eine adaptive Dämpffunktion an unterschiedliche Fahrzustände durch Ver änderung des Drosselquerschnitts. Eine Abschaltung dieser optionalen Funktion z.B. bei Tieftemperaturen ist möglich. Von der Fahrbahn erregte Störungen führen an der Zahnstange zu einem linearen Verschiebeweg. Der Kolben verdrängt dabei Öl, welches über die Tankleitung abgeführt wird. Das im Rücklauf angeordnete Servodrosselventil besitzt eine veränderliche Blende. In Abhängigkeit des Drosselquerschnitts und dem Volumenstrom bildet sich ein Differenzdruck, welcher zu einer Kraft im Zylinderraum des Stellaggregates führt und der Störung entgegenwirkt. Hierdurch wird das System vorteilhaft gedämpft. Durch Veränderung des Steuerstromes kann der Drosselquerschnitt und damit der Grad der Dämpfung beeinflußt werden.The advantageous provision of a servo throttle valve in the return of the Pressure reducing valves allow an adaptive damping function to different driving conditions by Change the throttle cross-section. A shutdown of this optional feature e.g. at cryogenic temperatures is possible. Off the road excited disturbances to lead on the rack to a linear displacement. The piston displaces oil, which over the Tank line dissipated becomes. That in the return arranged servo throttle valve has a variable aperture. Dependent on the throttle cross section and the volume flow forms a differential pressure, which leads to a force in the cylinder chamber of the actuator and the disorder counteracts. As a result, the system is advantageously damped. By change the control current, the throttle area and thus the degree the damping affected become.
Zur Verbesserung der Reglungsstrategie und Überwachung des Systemdrucks können mittels optionaler Drucksensoren die Drücke in den Arbeitsräumen überwacht bzw. ermittelt werden. Der Druckaufbau läßt sich so im Gegensatz zur Variante mit gesteuerten Ventilen beschleunigen und verbessert das Ansprechverhalten der Lenkung.to Improvement of the regulatory strategy and monitoring of system pressure can monitored by means of optional pressure sensors, the pressures in the work spaces or determined. The pressure build-up can be so in contrast to Variant with controlled valves accelerates and improves the response the steering.
Nachfolgend werden anhand von Zeichnungen mögliche Ausführungsformen der Erfindung näher erläutert.The following are drawings based on Zeichnun gen possible embodiments of the invention explained in more detail.
Es zeigen:It demonstrate:
Gemäß
Die
Zahnstange bildet einen Teil einer Kolbenstange
Die
Druckminderventile
Die
Pumpe
Die
Steuereinheit
Zudem
kann die Steuereinheit
Der
nach Art eines Schiebers dargestellte Ventilkörper eines Druckminderventils
Vorzugsweise
ist das Steuerorgan S selbsthemmungsfrei ausgebildet, bspw. als
Stellmagnet, so dass bei der Abschaltung des elektrischen Steuerstroms
für das
Steuerorgan S dieses keine Kraft mehr erzeugt, mit der Folge, dass
die Feder F den Ventilkörper
unabhängig
vom hydrau lischen Druck in der Anschlußleitung
Zur
Verbesserung der mechanischen Dämpfungsfunktion
kann, wie in
An
Stelle von elektromechanischer Druckminderventile können auch
vorgesteuerte Druckminderventile verwendet werden. Die
Claims (8)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202004008847U DE202004008847U1 (en) | 2004-02-09 | 2004-02-09 | Hydraulic power steering has pressure and/or flow regulated pump, with volume flow adjustable independently of generated pressure, and pressure reducing valves as electromechanical or hydraulically controlled 3-way valves |
DE102004027903.9A DE102004027903B4 (en) | 2004-02-09 | 2004-06-09 | Hydraulic steering with regulated pump |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202004008847U DE202004008847U1 (en) | 2004-02-09 | 2004-02-09 | Hydraulic power steering has pressure and/or flow regulated pump, with volume flow adjustable independently of generated pressure, and pressure reducing valves as electromechanical or hydraulically controlled 3-way valves |
DE102004006362A DE102004006362B4 (en) | 2004-02-09 | 2004-02-09 | Hydraulic steering with regulated pump |
Publications (1)
Publication Number | Publication Date |
---|---|
DE202004008847U1 true DE202004008847U1 (en) | 2005-06-23 |
Family
ID=34712425
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE202004008847U Expired - Lifetime DE202004008847U1 (en) | 2004-02-09 | 2004-02-09 | Hydraulic power steering has pressure and/or flow regulated pump, with volume flow adjustable independently of generated pressure, and pressure reducing valves as electromechanical or hydraulically controlled 3-way valves |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE202004008847U1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008025154A1 (en) * | 2008-05-26 | 2009-12-03 | Trw Automotive Gmbh | Pressure limiting method for cylinder chamber of hydraulic actuator in steering system, involves controlling pressure prevailed in cylinder chambers to reference pressure, and providing safety valve in hydraulic system |
CN107117206A (en) * | 2017-04-21 | 2017-09-01 | 江苏大学 | A kind of storage-type electric hydraulic pressure assisted steering device |
-
2004
- 2004-02-09 DE DE202004008847U patent/DE202004008847U1/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008025154A1 (en) * | 2008-05-26 | 2009-12-03 | Trw Automotive Gmbh | Pressure limiting method for cylinder chamber of hydraulic actuator in steering system, involves controlling pressure prevailed in cylinder chambers to reference pressure, and providing safety valve in hydraulic system |
CN107117206A (en) * | 2017-04-21 | 2017-09-01 | 江苏大学 | A kind of storage-type electric hydraulic pressure assisted steering device |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
R207 | Utility model specification |
Effective date: 20050728 |
|
R150 | Utility model maintained after payment of first maintenance fee after three years |
Effective date: 20070316 |
|
R151 | Utility model maintained after payment of second maintenance fee after six years |
Effective date: 20100406 |
|
R152 | Utility model maintained after payment of third maintenance fee after eight years |
Effective date: 20120308 |
|
R071 | Expiry of right | ||
R071 | Expiry of right |