WO2016083063A1 - Système de direction pour véhicule automobile et procédé de purge d'un système de direction de véhicule automobile - Google Patents

Système de direction pour véhicule automobile et procédé de purge d'un système de direction de véhicule automobile Download PDF

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Publication number
WO2016083063A1
WO2016083063A1 PCT/EP2015/074990 EP2015074990W WO2016083063A1 WO 2016083063 A1 WO2016083063 A1 WO 2016083063A1 EP 2015074990 W EP2015074990 W EP 2015074990W WO 2016083063 A1 WO2016083063 A1 WO 2016083063A1
Authority
WO
WIPO (PCT)
Prior art keywords
hydraulic cylinder
steering system
pressure chamber
hydraulic
piston
Prior art date
Application number
PCT/EP2015/074990
Other languages
German (de)
English (en)
Inventor
Kai Eckmann
Stefan Häussler
Hermann Blaser
Original Assignee
Robert Bosch Automotive Steering Gmbh
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 Robert Bosch Automotive Steering Gmbh filed Critical Robert Bosch Automotive Steering Gmbh
Publication of WO2016083063A1 publication Critical patent/WO2016083063A1/fr

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Classifications

    • 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
    • B62D5/062—Details, component parts
    • 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
    • B62D5/10—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 type of power unit
    • B62D5/12—Piston and cylinder
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/204—Control means for piston speed or actuating force without external control, e.g. control valve inside the piston
    • 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
    • F15B21/044—Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20561—Type of pump reversible
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/27—Directional control by means of the pressure source
    • 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
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members

Definitions

  • Lenksvstem for a motor vehicle and method for venting a
  • the invention relates to a steering system for a motor vehicle.
  • the invention further relates to a method for venting a steering system for a motor vehicle.
  • powered hydraulic pump is powered or driven. At least in passenger cars, these power steering are used as so-called "open center" - steering gear, ie that the hydraulic oil is constantly pumped in.
  • open center ie that the hydraulic oil is constantly pumped in.
  • EP 1 415 892 A1 discloses a steering system with a "closed center.” An electric motor drives a reversible pump which, if desired, pumps hydraulic oil into one
  • Such an electro-hydraulic steering system can be used both for a main steering on a front axle, as well as for the steering of a rear axle. It does not matter if in this steering system, the actuator is a rack and pinion, a cylinder or a block steering.
  • the lines of the Engine and pump unit are connected as hose or pipe lines to the steering actuator. In these lines the hydraulic oil flows in both directions.
  • the hydraulic oil is conveyed via the reversing pump from one pressure chamber into the other pressure chamber.
  • An oil reservoir is only needed to create a volume balance for the hydraulic oil. The volume compensation is due to pressure, temperature and different sized pressure chambers. For the most part it will
  • Air trapping in the steering system is true as a bad steering feeling. Therefore, a hydraulically faultless system must be vented in the best possible way. Among other things, this is taken into account by the fact that steering systems are generally filled with vacuum. Before the actual filling, the air is sucked out of the steering system, so that the hydraulic oil to be filled can fill out the steering gear as far as possible without trapped air. However, this is only theoretical, because a completely empty room can not be created in the rule. It turns out that the vacuum filling alone is therefore insufficient. In addition, in one must
  • the invention is therefore based on the object to provide a steering system for a motor vehicle and a method for venting a steering system, which allows for a filling with hydraulic fluid, a simple and reliable removal of air pockets present in the steering system.
  • the object is achieved with a steering system for a motor vehicle having the features of patent claim 1. Furthermore, the object with a method for venting a steering system for a motor vehicle with the features of
  • Patent claim 9 solved.
  • the present invention provides a steering system for a motor vehicle having a hydraulic cylinder in which a piston movable in the axial direction of the hydraulic cylinder is arranged, the hydraulic cylinder having a first and second pressure chambers separated from each other by the piston, and wherein the hydraulic cylinder has a first one in operation a reversible hydraulic pump, which is connected by a first hydraulic line to the first pressure chamber of the hydraulic cylinder and by a second hydraulic line to the second pressure chamber of the hydraulic cylinder, an oil reservoir for volume balance of the hydraulic cylinder, and means for venting the A steering system, wherein the hydraulic cylinder has a lying outside the first usable stroke second stroke for venting the steering system, wherein the means for venting the steering system is adapted to, at locations of the piston in a portion of the second stroke of the hydraulic cylinder, the first pressure chamber of the hydraulic cylinder with the second pressure chamber of the
  • the present invention further provides a method of venting a steering system for a motor vehicle.
  • the method comprises providing a hydraulic cylinder in which a piston movable in the axial direction of the hydraulic cylinder is arranged, wherein the hydraulic cylinder has a first and second pressure chambers separated by the piston, and wherein the hydraulic cylinder has a first lift usable in an operation of the steering system ,
  • the method further comprises providing a reversible
  • Hydraulic pump which through a first hydraulic line with the first
  • the method further comprises providing an oil reservoir for volume balance of the hydraulic cylinder.
  • the method further includes providing a means for venting the steering system, the hydraulic cylinder having a second hub for bleeding the steering system outside of the first usable stroke, the means for venting the steering system at locations of the piston in a region of the second stroke the hydraulic cylinder, the first pressure chamber of the hydraulic cylinder with the second pressure chamber of the
  • Hydraulic cylinder fluidly connects.
  • One idea of the present invention is to improve a "closed center" steering system so that it can be easily and reliably vented, whereby the venting is implemented in such a way that there are no disadvantages with regard to steering speed or steering force in the system
  • the steering system is active during the filling process of the steering system
  • Hydraulic cylinder is adjustable in a specially provided for a bleed mode of the steering system area outside a usable stroke of the hydraulic cylinder. Only in this position of the piston is the device for venting the
  • the device for venting the steering system is formed by a third hydraulic line of the steering system, which at points of the piston in the region of the second stroke of the
  • Hydraulic cylinder is adapted to fluidly connect the first pressure chamber of the hydraulic cylinder with the second pressure chamber of the hydraulic cylinder.
  • a circuit can be created in an advantageous manner in which the existing hydraulic fluid in the system by means of the third hydraulic line or
  • Overflow line flows through the hydraulic cylinder and the hydraulic lines are thus flushed.
  • the third hydraulic line of the steering system is designed, when the piston is in the area of the second stroke of the hydraulic cylinder, the first pressure chamber of the
  • Hydraulic cylinder to be directly or indirectly fluidly connected to the second pressure chamber of the hydraulic cylinder, wherein an indirect connection is formed by a connection of the first pressure chamber of the hydraulic cylinder with the second hydraulic line or by a connection of the second pressure chamber of the hydraulic cylinder with the first hydraulic line.
  • a routing of the third Hydraulic line for the overflow of hydraulic fluid from the first pressure chamber into the second pressure chamber of the hydraulic cylinder can thus be adapted in an advantageous manner to structural conditions or requirements of the steering system.
  • the device for venting the steering system by at least one arranged in an opening of the piston, mechanically releasable check valve and a with the
  • Check valve has the advantage that, in contrast to a provision of only one check valve significantly weaker springs can be used. As a result, less force is needed to the respective unlockable
  • a switchable vent valve is arranged, which has a first, connected to the first pressure chamber or the second pressure chamber of the hydraulic cylinder port, a second, with the reversible hydraulic pump connected terminal, and a third, connected to the oil reservoir connection.
  • the switchable venting valve is designed to connect the first or the second hydraulic line to the reversible hydraulic pump in a first switching position, and to connect the first or the second hydraulic line to the oil reservoir in a second switching position connect.
  • the oil tank thus advantageously has the function of removing air pockets present in the steering system by discharging the air connections to the atmosphere from the steering system.
  • Steering system having a suction valve, wherein the reversible hydraulic pump at points of the switchable vent valve in the second switching position
  • Hydraulic fluid via the Nachsaugeventil from the oil reservoir promotes if a fluid level of the oil reservoir exceeds a predetermined threshold, and wherein the oil reservoir has a venting device for delivering promoted from the steering system air inflows to an ambient atmosphere.
  • After-suction valve has the function to suck hydraulic fluid into the hydraulic cylinder via the reversible pump, which is free of air leaks.
  • the control of the pump is in this case advantageously to a device for
  • Fig. 1 is a schematic representation of a steering system for a motor vehicle according to a preferred embodiment of the invention
  • Fig. 2 is a schematic representation of the steering system for a motor vehicle
  • Fig. 3 is a schematic representation of the steering system for a motor vehicle
  • Fig. 4 is a schematic representation of the steering system for a motor vehicle
  • FIG. 5 is a flowchart of a method for venting a steering system for a motor vehicle according to the preferred and further preferred embodiments of the invention.
  • FIG. 1 shows a schematic representation of a steering system for a motor vehicle according to a preferred embodiment of the invention.
  • the steering system 1 for a motor vehicle has a hydraulic cylinder 10, in which a piston 12 which is movable in the axial direction of the hydraulic cylinder 10 is arranged, the hydraulic cylinder 10 having a first and second pressure chambers 14, 16 separated from one another by the piston 12.
  • the hydraulic cylinder 10 has a first stroke H1 usable in an operation of the steering system 1 and a second stroke H2 lying outside the first usable stroke H1 for venting the steering system 1.
  • the second stroke H2 outside the first usable stroke H1 is formed at an end portion of the first pressure chamber 14 in the following embodiment.
  • the second stroke H2 for example, at an opposite end portion of the second
  • Pressure chamber 16 of the hydraulic cylinder 10 or be formed at both end portions in the axial direction of the hydraulic cylinder 10.
  • the steering system further includes a reversible hydraulic pump 17.
  • the reversible hydraulic pump 17 is connected to the hydraulic cylinder 10 through a first hydraulic line 18 and a second hydraulic line 20.
  • the first hydraulic line 18 is preferably connected to the first pressure chamber 14 of the
  • Hydraulic cylinder 10 connected.
  • the second hydraulic line 20 is preferably connected to the second pressure chamber 16 of the hydraulic cylinder 10.
  • the steering system 1 further comprises a device 24 for venting the
  • the device 24 for venting the steering system 1 is designed to fluidly connect at locations of the piston 12 in a region of the second stroke H2 of the hydraulic cylinder 10, the first pressure chamber 14 of the hydraulic cylinder 10 with the second pressure chamber 16 of the hydraulic cylinder 10.
  • the device 24 for venting the steering system 1 is preferably formed by a third hydraulic line 25 of the steering system 1.
  • Line of the steering system 1 connects in the present embodiment at locations of the piston 12 in the region of the second stroke H2 of the hydraulic cylinder 10, the second pressure chamber 16 with the first hydraulic line 18.
  • Hydraulic fluid through the hydraulic pump 17 from the second pressure chamber 16 into the first hydraulic line 18 and from there via the second hydraulic line 20 again in the second pressure chamber 16 can be circulated.
  • the steering system 1 furthermore has a switchable arrangement arranged in the region of the first hydraulic line 18 in the present embodiment
  • the switchable venting valve 32 preferably has a first port 32a connected to the first pressure chamber 14, a second port 32b connected to the reversible hydraulic pump 17, and a third port 32c connected to an oil reservoir 22 of the steering system 1.
  • the switchable vent valve 32 is thus formed in the present embodiment as a 3/2-way valve. Alternatively, the switchable
  • Venting valve 32 also in the region of the second hydraulic line 20th
  • the switchable venting valve 32 is preferably designed to connect the first hydraulic line 18 to the reversible hydraulic pump 17 in a first switching position (not shown in FIG. 1).
  • the switchable venting valve 32 is further preferably designed to connect the first hydraulic line 18 to the oil reservoir 22 in a second switching position P2.
  • the switchable vent valve 32 may also be arranged such that it connects the second hydraulic line 20 with the oil reservoir 22.
  • the steering system 1 advantageously has a suction-suction valve 34.
  • the Nachsaugeventil 34 is connected via a hydraulic line in such a way with the reversible hydraulic pump 17, which is promoted at points of the switchable vent valve 32 in the second switching position P2 hydraulic fluid through the Nachsaugeventil 34 from the oil reservoir 22 in the circulation of the steering system 1.
  • the oil container 22 further preferably comprises a device for detecting a
  • the hydraulic fluid is conveyed via the Nachsaugeventil 34 from the oil reservoir 22.
  • the oil tank 22 vented from the steering system 1 promoted air inclusions preferably to an ambient atmosphere.
  • the third hydraulic line 25 may also be at an opposite end of the hydraulic cylinder as an alternative to the embodiment shown in FIG be arranged.
  • the second stroke H2 in which the piston 12 is arranged in a bleeding mode of the steering system 1, would also be arranged at an opposite end of the hydraulic trainer 10.
  • the third hydraulic line 25 in this case connects the first pressure chamber 14 with the second hydraulic line 20.
  • the third hydraulic line 25 may also be designed such that it directly connects the first pressure chamber 14 with the second pressure chamber 16 of the hydraulic cylinder 10.
  • a division of the hydraulic cylinder 10 is preferably implemented in an interior of a steering gear housing. This can be done, for example, by providing
  • a total stroke of the hydraulic cylinder 10 is composed of the stroke H1, which corresponds to a usable during operation of the hydraulic cylinder 10 stroke, and the stroke H2 for venting the steering system 1, together.
  • a travel range of the piston 12 is limited to the usable stroke H1. This can be provided, for example, by providing an axle stop or a software-controlled end stop of the piston 12.
  • the stroke H2 it is also possible to use the stroke H2 as a hydraulic end limitation, since upon reaching the stroke H2, the pressure is reduced via the line 25 and thus the steering assistance is no longer given.
  • Fig. 2 shows a schematic representation of the steering system for a motor vehicle according to the preferred embodiment of the invention.
  • the steering system 1 is in the embodiment shown in Fig. 2 in a
  • the switchable vent valve 32 is in the following
  • Fig. 3 shows a schematic representation of the steering system for a motor vehicle according to another preferred embodiment of the invention.
  • FIG. 3 further embodiment of the invention is the Device 24 for venting the steering system 1 by a arranged in an opening of the piston 12, mechanically releasable check valve 26 and formed with the check valve 26 cooperating actuator 27 is formed.
  • the actuating element 27 is preferably arranged on an inner wall 10 a of the hydraulic cylinder 10.
  • the actuator 27 advantageously has a pin shape. Alternatively, the actuator may also have another suitable shape.
  • check valve 26 is opened and there may be a fluidic connection between the first pressure chamber 14 and the second pressure chamber sixteenth take place of the hydraulic cylinder 10.
  • a provided in the check valve 26 spring is designed such that the
  • FIG. 4 shows a schematic representation of the steering system for a motor vehicle according to a further preferred embodiment of the invention.
  • the means 24 for venting the steering system 1 is preferably by a first, mechanically pilot-operated check valve 28 and a second, arranged opposite thereto
  • the check valve 28 and the second check valve 30 are advantageously arranged in the axial direction of the piston 12 sequentially in the opening of the piston 12. As described with reference to the embodiment shown in Fig. 3, acts in the present embodiment, the first, mechanically unlockable
  • the actuating element 27 is preferably designed pin-shaped.
  • the actuating element 27 is advantageously designed to open at positions of the piston 12 in the region of the second stroke H2 of the hydraulic cylinder by applying pressure to the first check valve 28 of this and thus a fluidic connection between the first
  • FIG. 5 shows a flowchart of a method for venting a steering system for a motor vehicle according to the preferred and further preferred
  • the method for venting the steering system 1 for a motor vehicle preferably comprises providing S1 a hydraulic cylinder in which a piston movable in the axial direction of the hydraulic cylinder is arranged, wherein the hydraulic cylinder has a piston separated from each other by the first and second pressure chamber, and wherein the hydraulic cylinder a first, usable in an operation of the steering system hub and a lying outside the usable hub second hub for venting the steering system.
  • the method further comprises providing S2 a reversible hydraulic pump which is connected by a first hydraulic line to the first pressure chamber of the hydraulic cylinder and by a second hydraulic line to the second pressure chamber of the hydraulic cylinder.
  • the method further comprises providing S3 an oil reservoir for volume balance of the hydraulic cylinder.
  • the method further comprises providing S4 a means for venting the steering system, which fluidly connects the first pressure chamber of the hydraulic cylinder with the second pressure chamber of the hydraulic cylinder at locations of the piston in a region of the second stroke of the hydraulic cylinder.
  • the fluidic connection of the first pressure chamber of the hydraulic cylinder with the second pressure chamber of the hydraulic cylinder is preferably provided by means of a third hydraulic line, which at locations of the piston in the region of the second stroke of the hydraulic cylinder, the first pressure chamber of
  • Hydraulic cylinder fluidly connects to the second pressure chamber of the hydraulic cylinder.
  • the fluidic connection of the first pressure chamber with the second pressure chamber of the hydraulic cylinder by providing a disposed in an opening of the piston, mechanically
  • the fluidic connection of the first pressure chamber with the second pressure chamber of the hydraulic cylinder by a first, mechanically pilot-operated check valve and a second, oppositely arranged non-return valve, which are arranged in the axial direction of the piston sequentially in the opening of the piston and interact with an actuator carried out.
  • the actuator disposed on an inner wall of the hydraulic cylinder opens the first check valve at locations of the piston in the region of the second stroke of the hydraulic cylinder.
  • the second check valve is opened by the pressure applied in the pressure chamber hydraulic pressure.
  • a switchable venting valve is preferably provided in the region of the first hydraulic line, the switchable venting valve connecting the first hydraulic line to the reversible hydraulic pump in a first switching position, and connecting the first hydraulic line to the oil reservoir in a second switching position for bleeding the steering system S5.
  • the switchable vent valve may be e.g. be arranged in the region of the second hydraulic line.
  • a suction valve is preferably provided, wherein the reversible hydraulic pump promotes at points of the switchable vent valve in the second switching position for venting the steering system hydraulic fluid through the suction valve from the oil reservoir, if a liquid level of the
  • Oil tank exceeds a predetermined threshold, and wherein the oil reservoir from the steering system funded air inclusions via a ventilation device to an ambient atmosphere.
  • the result is preferably a circuit in which the entire hydraulic fluid of the steering system flows over the oil reservoir.
  • Flow rate is advantageously every air inclusion, including air trapped in a line to the oil tank and taken in the oil tank issued.
  • the Nachsaugeventil the oil reservoir is designed such that no new air bubbles can be accommodated in the steering system about it. If the steering system is free of air bubbles, the switchable bleeder valve is switched to "steering gear in operation" and the piston is moved to the area of the usable stroke.
  • the travel range of the piston is limited to the usable stroke. This can preferably be achieved by an axle stop or a software-controlled end stop.
  • this venting measure in the end region of the hydraulic cylinder is an internal steering limiter of the steering system. In this case, a pressure necessary for steering upon reaching a venting position is reduced by the device for venting the steering system in the direction of a suction side of the hydraulic pump, so that further movement of the piston towards the end stop is no longer hydraulically assisted.
  • the switchable vent valve is preferably mechanically switchable.
  • check valve according to the invention for fluidically connecting the first pressure chamber with the second pressure chamber of the hydraulic cylinder can be designed such that a

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

L'invention concerne un système de direction (1) pour un véhicule automobile, comprenant un cylindre hydraulique (10) dans lequel un piston (12) est monté de manière mobile dans la direction axiale du cylindre hydraulique (10), le cylindre hydraulique (10) comprenant une première et une deuxième chambre de pression (14, 16) séparées l'une de l'autre par le piston (12). Le cylindre hydraulique (10) présente une deuxième course (2) située au-delà d'une course utile (H1) et destinée à purger le système de direction (1). Un dispositif (24) de purge du système de direction (1) relie la première chambre de pression (14) à la deuxième chambre de pression (16) lorsque le piston (12) est placé dans la zone de la deuxième course (H2) du cylindre hydraulique (10). L'invention concerne en outre un procédé de purge d'un système de direction (1) pour un véhicule automobile.
PCT/EP2015/074990 2014-11-26 2015-10-28 Système de direction pour véhicule automobile et procédé de purge d'un système de direction de véhicule automobile WO2016083063A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014117327.9A DE102014117327A1 (de) 2014-11-26 2014-11-26 Lenksystem für ein Kraftfahrzeug und Verfahren zum Entlüften eines Lenksystems für ein Kraftfahrzeug
DE102014117327.9 2014-11-26

Publications (1)

Publication Number Publication Date
WO2016083063A1 true WO2016083063A1 (fr) 2016-06-02

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DE (1) DE102014117327A1 (fr)
WO (1) WO2016083063A1 (fr)

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