WO1994011231A1 - Power-assisted rack and pinion steering system, especially for motor vehicles - Google Patents

Power-assisted rack and pinion steering system, especially for motor vehicles Download PDF

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Publication number
WO1994011231A1
WO1994011231A1 PCT/EP1993/003072 EP9303072W WO9411231A1 WO 1994011231 A1 WO1994011231 A1 WO 1994011231A1 EP 9303072 W EP9303072 W EP 9303072W WO 9411231 A1 WO9411231 A1 WO 9411231A1
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WO
WIPO (PCT)
Prior art keywords
rack
pinion
connecting part
fastening means
working
Prior art date
Application number
PCT/EP1993/003072
Other languages
German (de)
French (fr)
Inventor
Werner Breitweg
Arthur Rupp
Jürgen BIEBER
Original Assignee
Zf Friedrichshafen Aktiengesellschaft
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 Zf Friedrichshafen Aktiengesellschaft filed Critical Zf Friedrichshafen Aktiengesellschaft
Publication of WO1994011231A1 publication Critical patent/WO1994011231A1/en

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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
    • B62D5/10—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

Definitions

  • the invention relates to a rack-and-pinion steering, in particular for motor vehicles, according to the preamble of claim 1.
  • a pinion is rotatably mounted in a steering housing.
  • a toothed rack is guided axially displaceably in the steering housing and is held in engagement with the pinion by a spring-loaded pressure piece.
  • a servo motor is used for auxiliary power support, the piston rod of which is operatively connected to the toothed rack.
  • a control device for controlling the pressure medium to and from the servo motor can be adjusted as a function of a movement of the pinion.
  • the two working spaces of the servo motor are connected to the control device via two working lines, which are connected to a cylinder of the servo motor and to the control device via connecting parts and, like a pressure line from a servo pump and a return line leading to a container, by fastening means are held on the connecting parts.
  • Such a rack and pinion power steering system is known from DE-C3-24 06 566.
  • the pipelines are connected to the connecting parts via screw connections.
  • Such screw connections must be installed with a defined tightening torque in order to ensure a secure connection.
  • This type of connection of the pipelines with the connecting parts entails high costs for the manufacture and assembly of the individual parts.
  • the object of the invention is to improve the known power assisted rack and pinion steering in such a way that it is more cost-effective in terms of part costs, manufacturing costs and assembly costs in the area of the connections between the pipes and the connecting parts of the cylinder and control device. All the requirements with regard to function and strength, as in previously known power assisted rack and pinion steering systems, are to be achieved.
  • each working line, pressure line and / or return line has at its end an annular area whose diameter is limited or enlarged in its axial length, in the form of a collar or an annular groove, and is made by an overlapping collar or engaging in the annular groove Fasteners held on the connecting part.
  • the fastening means is deformed elastically or plastically. It is advantageous here that a thread does not have to be produced either on the connecting part or on the fastening means.
  • the fastening means can therefore be produced as a simple, cold-formed sheet metal part which is pushed onto the line and is elastically deformed for fastening to the connecting part.
  • several embodiments are specified by means of which the fastening means is held and secured on the connecting part. Should the fixed
  • REPLACEMENT LEAF detergent additionally against unintended users Unoerugres loosening can be secured, so parts of the fastener can be deformed and bent against the connecting part.
  • Another possibility of attaching the pipeline to the connecting part in an undetachable manner is that the free end of the connecting part is deformed by cold forming around the collar of the working line or into the annular groove of the working line.
  • FIG. 1 shows a longitudinal section through the auxiliary power steering of the rack according to the invention
  • FIG. 2 shows a partial cross section through the auxiliary power steering system of FIG. 1 in the area of the pinion and the pressure piece;
  • FIG. 3 shows an enlarged section from FIG
  • FIGS. 4B and 3 top views of the exemplary embodiment of FIGS. 4B and 3 with an assembled or elastic or plastic deformed retaining clip;
  • SPARE BLADE 5 further embodiments with elastically secured to 10 fastening means
  • FIG. 11 shows an exemplary embodiment of the fastening with plastic deformation of the connecting parts.
  • a pinion 2 is rotatably mounted in two bearings 3 and 4.
  • the pinion 2 carries at one end a steering spindle connection 5 for connection to a steering member, for example a steering spindle (not shown) with a steering handwheel.
  • Da ⁇ pinion 2 is via its teeth in engagement with a rack 6, which i ⁇ t guided axially displaceable in the steering housing 1.
  • the rack 6 is pressed in a known manner against the teeth of the pinion 2 by means of a spring-loaded pressure piece 7.
  • a servo motor 8 serves as auxiliary power support, the piston rod 10 of which is firmly connected to the toothed rack 6.
  • the servo motor 8 contains two cylinder spaces 12 and 13 in a cylinder 11, which are connected via working lines 14 and 15 to two cylinder connections 16 and 17 of a control device 18.
  • the control device 18 also has an inlet connection 20 to which a servo pump 21 is connected.
  • a container 23 is connected to a return connection 22.
  • the working lines 14 and 15 are connected to the cylinder 11 via two connecting parts 24 and 25.
  • the control device 18 also has connecting parts to which the two working lines 14 and 15 and a pressure line 26 from the servo pump 21 and a return line 27 leading to the container 23 are connected.
  • the connecting part 24 is formed in one piece with the cylinder 11 and has an annular collar 28 which projects outwards from the cylinder and which is formed out of the wall of the cylinder 11 in terms of forming technology.
  • An annular collar 30 with an undercut 31 is formed on the free end of the collar 28.
  • Each working line 14 and 15 - the same also applies to the pressure line 26 and the return line 27 - has at its end an annular diameter which is enlarged or reduced in its axial length, in the form of a collar 32 or an annular groove 33.
  • a fastening means in the form of a retaining clip 34 overlaps the collar 32 and engages in the undercut 31 of the connecting part 24.
  • a possible embodiment of the retaining clip 34 can be seen in FIG. 4A. From this it is clear that the retaining clip 34 is semicircular and has two tab-like extensions 35. The retaining clip 34 can thus be easily pushed from the side over the collar 32 and the connecting part 24.
  • the extensions 35 of the retaining clip 34 can be slightly bent, so that they rebound during the assembly process and spring back to their starting position after the assembly has ended, in which they prevent easy loosening or too easy disassembly.
  • the extensions 35 can be deformed and placed around the working line 14 and the collar 32. This is shown in Figure 4B.
  • REPLACEMENT LEAF 5 shows a retaining clip 34 which has at least one clamping part 36, but preferably a plurality of clamping parts 36 distributed around the circumference. These clamping parts engage in the undercut 31 of the connecting part 24. The retaining clip 34 is then held and fastened on the connecting part 24 under pretension.
  • FIG. 6 and 7 shows a retaining clip 34, the upper part of which engages in the drawing in the annular groove 33 of the working line 14 and the lower part of which engages in the undercut 31 of the connecting piece 24.
  • two tab-shaped, resilient extensions 37 are formed in the lateral area of the retaining clip 34, which encompass the connecting part 24 and the retaining clip 34 after their assembly hold in place on the connecting part 24.
  • the fastening means comprises a snap ring 38 which engages in an annular recess or annular groove 40 located in the interior of the connecting part 24.
  • the fastening means is a spring sleeve 41 which is slit once or several times and thereby forms elastically deformable expansion parts 42. With the expansion parts 42, the connecting line 14 is clamped over the collar 32 against a shoulder 43 in the interior of the connection part 24. If the outside diameter of the collar 32 is made smaller than the inside diameter of the spring sleeve 41 in its cylindrical section, the working line 14 can be installed by simply plugging it into the connecting part 24 and the spring sleeve 41.
  • the fastening means is formed by the connecting part 24 itself. This is achieved in that the free end of the connecting part 24 is deformed by cold forming around the collar 32 of the working line 14. However, it is equally possible to mold the free end of the connecting part 24 into the annular groove 33 of the working line 14.
  • a sealing ring 45 is arranged in the interior of the connecting part 24 in all exemplary embodiments.

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

Abstract

In a power-assisted rack and pinion steering system designed especially for motor vehicles, a pinion (2) fitted in a steering box (1) engages with a rack (6). To provide power assistance there is a servo-motor (8), the piston rod (10) of which is operationally connected with the rack (6). A control device (18) to control a pressure medium to and from the servo-motor can be adjusted dependently upon a movement of the pinion (2). Both working chambers (12, 13) of the servo-motor (8) are connected to the control device (18) via working lines (14, 15) which are connected to a cylinder (11) of the servo-motor (8) and the control device (18) via two connectors (24, 25). Each working line (14, 15), besides a pressure line (26) from a servo-pump (21) and a return line (27) to a container (23), has a collar (32). Each line is held to the connector (24, 25) by a retaining clasp (34) surrounding the collar (32). For securing purposes, a tab-like extension to the retaining clasp (34) is elastically or plastically deformed after fitting.

Description

Zahnstangen-Hilfskraftlenkung, insbesondere für Kraftfahrzeuge Rack and pinion power steering, in particular for motor vehicles
Die Erfindung betrifft eine Zahnstangen-Hilfskraftlen¬ kung, insbesondere für Kraftfahrzeuge, nach dem Oberbegriff des Anspruchs 1. Bei einer derartigen Hilfskraftlenkung ist in einem Lenkgehäuse ein Ritzel drehbar gelagert. Eine Zahn¬ stange ist in dem Lenkgehäuse axial verschiebbar geführt und wird durch ein federbelasteteε Druckεtück in Eingriff mit dem Ritzel gehalten. Zur Hilfskraftunterεtützung dient ein Servo¬ motor, dessen Kolbenstange trieblich mit der Zahnstange ver¬ bunden ist. Eine Steuereinrichtung für die Steuerung des Druckmittels zu und von dem Servomotor ist in Abhängigkeit von einer Bewegung des Ritzelε verstellbar. Die beiden Arbeitεräume des Servomotors sind mit der Steuereinrichtung über zwei Arbeitsleitungen verbunden, die an einen Zylinder des Servomotors und an die Steuereinrichtung über Anschlu߬ teile angeschlossen und, ebenso wie eine Druckleitung von einer Servopumpe und eine zu einem Behälter führende Rücklauf- leitung, durch Befestigungsmittel an den Anschlußteilen ge¬ halten sind.The invention relates to a rack-and-pinion steering, in particular for motor vehicles, according to the preamble of claim 1. In such a steering system, a pinion is rotatably mounted in a steering housing. A toothed rack is guided axially displaceably in the steering housing and is held in engagement with the pinion by a spring-loaded pressure piece. A servo motor is used for auxiliary power support, the piston rod of which is operatively connected to the toothed rack. A control device for controlling the pressure medium to and from the servo motor can be adjusted as a function of a movement of the pinion. The two working spaces of the servo motor are connected to the control device via two working lines, which are connected to a cylinder of the servo motor and to the control device via connecting parts and, like a pressure line from a servo pump and a return line leading to a container, by fastening means are held on the connecting parts.
Eine derartige Zahnstangen-Hilfskraftlenkung ist bekannt aus der DE-C3-24 06 566. Bei einer derartigen Zahnstangen- Hilfskraftlenkung sind die Rohrleitungen über Schraubverbin¬ dungen mit den Anschlußteilen verbunden. Derartige Schraub¬ verbindungen müssen mit einem definierten Anzugsdrehmoment montiert werden, um eine sichere Verbindung zu gewährleisten. Diese Art der Verbindung der Rohrleitungen mit den Anschlu߬ teilen bedingt hohe Kosten für die Herstellung und Montage der einzelnen Teile. Der Erfindung liegt die Aufgabe zugrunde, die bekannte Zahnstangen-Hilfskraftlenkung derart zu verbessern, daß sie im Bereich der Verbindungen zwischen den Rohrleitungen und den Anschlußteilen von Zylinder und Steuereinrichtung kosten- günεtiger hinsichtlich der Teilekosten, der Fertigungskosten und der Montagekosten ausgeführt ist. Dabei sollen alle An¬ forderungen hinsichtlich Funktion und Festigkeit, wie bei bisher bekannten Zahnstangen-Hilfεkraftlenkungen, erreicht werden.Such a rack and pinion power steering system is known from DE-C3-24 06 566. In such a rack and pinion power steering system, the pipelines are connected to the connecting parts via screw connections. Such screw connections must be installed with a defined tightening torque in order to ensure a secure connection. This type of connection of the pipelines with the connecting parts entails high costs for the manufacture and assembly of the individual parts. The object of the invention is to improve the known power assisted rack and pinion steering in such a way that it is more cost-effective in terms of part costs, manufacturing costs and assembly costs in the area of the connections between the pipes and the connecting parts of the cylinder and control device. All the requirements with regard to function and strength, as in previously known power assisted rack and pinion steering systems, are to be achieved.
Diese Aufgabe wird durch die im Anspruch 1 gekennzeich¬ nete Zahnstangen-Hilfεkraftlenkung gelöεt. Zweckmäßige und vorteilhafte Ausgestaltungen der Erfindung sind in den Unteranεprüchen angegeben. Die Erfindung iεt jedoch nicht auf die Merkmalskombinationen der Ansprüche beschränkt. Für den Fachmann ergeben sich weitere sinnvolle Kombinationsmög¬ lichkeiten von Ansprüchen und einzelnen Anspruchsmerkmalen aus der Aufgabenstellung.This object is achieved by the rack-and-pinion power steering system characterized in claim 1. Expedient and advantageous embodiments of the invention are specified in the subclaims. However, the invention is not restricted to the combinations of features of the claims. For the person skilled in the art there are further useful combinations of claims and individual claim characteristics from the task.
Erfindungsgemäß weist jede Arbeitεleitung, Druck- und/ oder Rücklaufleitung an ihrem Ende einen ringförmigen, in seiner axialen Länge begrenzten Bereich vergrößerten oder verkleinerten Durchmesεerε in der Form eines Bundes bzw. einer Ringnut auf und wird durch ein den Bund übergreifendes bzw. in die Ringnut eingreifendes Befestigungsmittel an dem Anεchlußteil gehalten. Nach der Montage wird daε Befesti¬ gungsmittel elastiεch oder plaεtiεch verformt. Vorteilhaft ist dabei, daß weder am Anschlußteil noch an dem Befesti¬ gungsmittel ein Gewinde hergestellt werden muß. Das Befesti¬ gungsmittel kann deshalb als ein einfaches, kalt umgeformtes Blechteil hergestellt werden, das auf die Leitung aufgescho- ben und zur Befestigung an dem Anschlußteil elastisch ver- formt wird. In den Unteransprüchen sind mehrere Ausführungs¬ formen angegeben, durch die das Befestigungsmittel an dem Anschlußteil gehalten und gesichert wird. Soll das Befeεti-According to the invention, each working line, pressure line and / or return line has at its end an annular area whose diameter is limited or enlarged in its axial length, in the form of a collar or an annular groove, and is made by an overlapping collar or engaging in the annular groove Fasteners held on the connecting part. After assembly, the fastening means is deformed elastically or plastically. It is advantageous here that a thread does not have to be produced either on the connecting part or on the fastening means. The fastening means can therefore be produced as a simple, cold-formed sheet metal part which is pushed onto the line and is elastically deformed for fastening to the connecting part. In the subclaims, several embodiments are specified by means of which the fastening means is held and secured on the connecting part. Should the fixed
ERSATZBLATT gungεmittel zuεätzlich gegen unbeabsicntigteε r>zw. unoerugres Lösen gesichert werden, so können Teile des Befestigungε- mittelε plaεtiεch verformt und gegen das Anεchlußteil gebogen werden. Eine andere Möglichkeit, die Rohrleitung unlöεbar an dem Anεchlußteil zu befestigen, besteht darin, daß das freie Ende des Anεchlußteiles durch Kaltumformung um den Bund der Arbeitεleitung herum bzw. in die Ringnut der Arbeitεleitung hinein verformt wird.REPLACEMENT LEAF detergent additionally against unintended users Unoerugres loosening can be secured, so parts of the fastener can be deformed and bent against the connecting part. Another possibility of attaching the pipeline to the connecting part in an undetachable manner is that the free end of the connecting part is deformed by cold forming around the collar of the working line or into the annular groove of the working line.
Bei derart auεgebildeten Verbindungen werden Kosten ge¬ spart durch eine niedrigere Anzahl von Teilen, durch Verrin¬ gern bzw. Wegfallen von spanenden Bearbeitungεprozessen und durch Vereinfachung der Montage.With connections designed in this way, costs are saved by a lower number of parts, by reducing or eliminating machining processes and by simplifying assembly.
Im folgenden wird die Erfindung anhand mehrerer in der Zeichnung dargestellter Ausführungsbeispiele näher erläutert. Es zeigt:The invention is explained in more detail below with reference to several exemplary embodiments shown in the drawing. It shows:
Fig. 1 einen Längsschnitt durch die erfindungsgemäße Zahnstangen-Hilfεkraftlenkung;1 shows a longitudinal section through the auxiliary power steering of the rack according to the invention;
Fig. 2 einen Teilquerεchnitt durch die Zahnstangen- Hilfskraftlenkung der Fig. 1 im Bereich des Ritzels und des Druckstückε;FIG. 2 shows a partial cross section through the auxiliary power steering system of FIG. 1 in the area of the pinion and the pressure piece;
Fig. 3 einen vergrößerten Auεschnitt aus dem3 shows an enlarged section from FIG
Zylinderrohr gemäß dem Pfeil III in Fig. 1;Cylinder tube according to arrow III in Fig. 1;
Fig. 4A Draufsichten auf das Ausführungsbeiεpiel der und 4B Fig. 3 mit einer montierten bzw. elaεtiεch bzw. plaεtisch verformten Haltespange;4A top views of the exemplary embodiment of FIGS. 4B and 3 with an assembled or elastic or plastic deformed retaining clip;
ERSATZBLÄTT Fig. 5 weitere Ausführungεbeiεpiele mit elastisch bis 10 gesichertem Befeεtigungεmittel;SPARE BLADE 5 further embodiments with elastically secured to 10 fastening means;
Fig. 11 ein Ausführungεbeispiel der Befestigung mit plastischer Umformung des Anschlußteileε .11 shows an exemplary embodiment of the fastening with plastic deformation of the connecting parts.
In einem Lenkgehäuεe 1 ist ein Ritzel 2 in zwei Lagern 3 und 4 drehbar gelagert. Das Ritzel 2 trägt an seinem einen Ende einen Lenkspindelanschluß 5 für den Anschluß an ein Lenkorgan, beiεpielsweiεe eine nicht dargeεteilte Lenkεpindel mit einem Lenkhandrad.In a Lenkgehäuεe 1, a pinion 2 is rotatably mounted in two bearings 3 and 4. The pinion 2 carries at one end a steering spindle connection 5 for connection to a steering member, for example a steering spindle (not shown) with a steering handwheel.
Daε Ritzel 2 steht über seine Verzahnung in Eingriff mit einer Zahnstange 6, die in dem Lenkgehäuse 1 axial verschiebbar geführt iεt. Die Zahnstange 6 wird mit Hilfe eines federbelasteten Druckstückeε 7 in bekannter Weise gegen die Verzahnung des Ritzels 2 gedrückt.Daε pinion 2 is via its teeth in engagement with a rack 6, which iεt guided axially displaceable in the steering housing 1. The rack 6 is pressed in a known manner against the teeth of the pinion 2 by means of a spring-loaded pressure piece 7.
Zur Hilfεkraftunterstützung dient ein Servomotor 8, dessen Kolbenstange 10 fest mit der Zahnstange 6 verbunden iεt. Der Servomotor 8 enthält in einem Zylinder 11 zwei Zylinderräume 12 und 13, die über Arbeitεleitungen 14 und 15 mit zwei Zylinderanεchlüssen 16 und 17 einer Steuereinrich¬ tung 18 verbunden sind. Die Steuereinrichtung 18 weist außer¬ dem noch einen Zulaufanschluß 20 auf, an den eine Servo¬ pumpe 21 angeεchlossen iεt. An einen Rücklaufanschluß 22 iεt ein Behälter 23 angeεchloεεen. Die Arbeitεleitungen 14 und 15 εind an den Zylinder 11 über zwei Anεchlußteile 24 und 25 an¬ geschlossen.A servo motor 8 serves as auxiliary power support, the piston rod 10 of which is firmly connected to the toothed rack 6. The servo motor 8 contains two cylinder spaces 12 and 13 in a cylinder 11, which are connected via working lines 14 and 15 to two cylinder connections 16 and 17 of a control device 18. The control device 18 also has an inlet connection 20 to which a servo pump 21 is connected. A container 23 is connected to a return connection 22. The working lines 14 and 15 are connected to the cylinder 11 via two connecting parts 24 and 25.
Auch die Steuereinrichtung 18 weist Anschlußteile auf, an die die beiden Arbeitsleitungen 14 und 15 sowie eine Druckleitung 26 von der Servopumpe 21 und eine zu dem Be¬ hälter 23 führende Rücklaufleitung 27 angeεchloεsen sind. DieThe control device 18 also has connecting parts to which the two working lines 14 and 15 and a pressure line 26 from the servo pump 21 and a return line 27 leading to the container 23 are connected. The
ERSATZBLATT Anεchlußεtellen an der Steuereinrichtung 18 und an dem Zylin¬ der 11 sind im wesentlichen gleichwertig. Im folgenden wird deεhalb nur eine Anschlußstelle an dem Anεchlußteil 24 be- εchrieben.REPLACEMENT LEAF Connection points on the control device 18 and on the cylinder 11 are essentially equivalent. Therefore, only one connection point on the connecting part 24 is described below.
In dem Auεführungsbeiεpiel nach Fig. 3 iεt daε Anschlu߬ teil 24 einstückig mit dem Zylinder 11 ausgebildet und weist einen von dem Zylinder nach außen vorragenden, ringförmigen Kragen 28 auf, der umformtechnisch aus der Wand des Zylin¬ ders 11 herausgearbeitet iεt. An dem freien Ende des Kragenε 28 iεt ein Ringbund 30 mit einer Hinterschneidung 31 angeformt. Mit gleicher Wirkung kann das Anschlußteil 24 je¬ doch auch auf den Zylinder 11 als εeparateε Bauteil aufge¬ setzt und in bekannter Weise daran befestigt sein, wie dies in Fig. 5 bis 11 dargeεtellt iεt.In the exemplary embodiment according to FIG. 3, the connecting part 24 is formed in one piece with the cylinder 11 and has an annular collar 28 which projects outwards from the cylinder and which is formed out of the wall of the cylinder 11 in terms of forming technology. An annular collar 30 with an undercut 31 is formed on the free end of the collar 28. With the same effect, the connecting part 24 can, however, also be placed on the cylinder 11 as a separate component and fastened to it in a known manner, as is shown in FIGS. 5 to 11.
Jede Arbeitεleitung 14 und 15 - gleicheε gilt auch für die Druckleitung 26 und die Rücklaufleitung 27 - weiεt an ihrem Ende einen ringförmigen, in seiner axialen Länge be¬ grenzten Bereich vergrößerten oder verkleinerten Durchmessers in der Form eines Bundeε 32 bzw. einer Ringnut 33 auf. Ein Befestigungsmittel in der Form einer Haltespange 34 über¬ greift den Bund 32 und greift in die Hinterschneidung 31 des Anschlußteils 24 ein. Eine mögliche Auεführungsform der Halte¬ spange 34 ist aus Fig. 4A zu entnehmen. Daraus wird deutlich, daß die Haltespange 34 halbrundför ig ausgebildet ist und zwei lappenartige Fortsätze 35 besitzt. Die Haltespange 34 kann dadurch leicht von der Seite über den Bund 32 und das Anschlußteil 24 geschoben werden. Zur Sicherung können die Fortsätze 35 der Haltespange 34 leicht abgekröpft sein, so daß sie während des Montagevorgangs ausfedern und nach Be¬ endigung der Montage in ihre Ausgangsstellung zurückfedern, in der sie ein leichtes Lösen bzw. eine zu leichte Demontage verhindern. Für eine stärkere Sicherung der Haltespange 34 in ihrer montierten Stellung können die Fortsätze 35 plaεtiεch verformt und um die Arbeitεleitung 14 und den Bund 32 herum gelegt werden. Dies ist in Fig. 4B dargestellt.Each working line 14 and 15 - the same also applies to the pressure line 26 and the return line 27 - has at its end an annular diameter which is enlarged or reduced in its axial length, in the form of a collar 32 or an annular groove 33. A fastening means in the form of a retaining clip 34 overlaps the collar 32 and engages in the undercut 31 of the connecting part 24. A possible embodiment of the retaining clip 34 can be seen in FIG. 4A. From this it is clear that the retaining clip 34 is semicircular and has two tab-like extensions 35. The retaining clip 34 can thus be easily pushed from the side over the collar 32 and the connecting part 24. To secure the extensions 35 of the retaining clip 34 can be slightly bent, so that they rebound during the assembly process and spring back to their starting position after the assembly has ended, in which they prevent easy loosening or too easy disassembly. For a stronger securing of the retaining clip 34 in its assembled position, the extensions 35 can be deformed and placed around the working line 14 and the collar 32. This is shown in Figure 4B.
ERSATZBLATT In dem Ausführungsbeiεpiel nach Fig. 5 iεt eine Halte- εpange 34 dargestellt, die wenigstens ein Klemmteil 36, vor¬ zugsweise jedoch mehrere am Umfang verteilte Klemmteile 36, aufweist. Diese Klemmteile greifen in die Hinterschneidung 31 des Anschlußteilε 24 ein. Die Halteεpange 34 iεt dann an dem Anschlußteil 24 unter Vorεpannung gehalten und befeεtigt.REPLACEMENT LEAF 5 shows a retaining clip 34 which has at least one clamping part 36, but preferably a plurality of clamping parts 36 distributed around the circumference. These clamping parts engage in the undercut 31 of the connecting part 24. The retaining clip 34 is then held and fastened on the connecting part 24 under pretension.
Daε Auεführungεbeiεpiel nach Fig. 6 und 7 zeigt eine Haltespange 34, deren in der Zeichnung oberer Teil in die Ringnut 33 der Arbeitεleitung 14 eingreift und dessen unterer Teil in die Hinterschneidung 31 des Anschlußstückes 24 ein¬ greift. Um zu verhindern, daß die Haltespange 34 leicht oder unbeabsichtigt von dem Anschlußteil 24 entfernt werden kann, sind im seitlichen Bereich der Halteεpange 34 zwei lappen- förmige, federnde Fortεätze 37 angeformt, die das Anschlu߬ teil 24 umgreifen und die Haltespange 34 nach ihrer Montage an dem Anschlußteil 24 einrastend halten.6 and 7 shows a retaining clip 34, the upper part of which engages in the drawing in the annular groove 33 of the working line 14 and the lower part of which engages in the undercut 31 of the connecting piece 24. In order to prevent the retaining clip 34 from being easily or unintentionally removed from the connecting part 24, two tab-shaped, resilient extensions 37 are formed in the lateral area of the retaining clip 34, which encompass the connecting part 24 and the retaining clip 34 after their assembly hold in place on the connecting part 24.
In dem Ausführungsbeiεpiel nach Fig. 8 und 9 iεt daε Befestigungsmittel ein Sprengring 38, der in eine im Inneren des Anschlußteiles 24 liegende ringförmige Ausnehmung bzw. Ringnut 40 eingreift.In the exemplary embodiment according to FIGS. 8 and 9, the fastening means comprises a snap ring 38 which engages in an annular recess or annular groove 40 located in the interior of the connecting part 24.
In dem Ausführungsbeiεpiel nach Fig. 10 ist das Befesti¬ gungsmittel einen Federhülse 41, die ein- oder mehrfach ge¬ schlitzt iεt und dadurch elastisch verformbare Spreizteile 42 bildet. Mit den Spreizteilen 42 wird die Anschlußleitung 14 über den Bund 32 gegen eine Schulter 43 im Inneren deε An- εchlußteileε 24 verεpannt. Wird der Außendurchmeεser deε Bundes 32 kleiner ausgeführt als der Innendurchmesser der Federhülse 41 in ihrem zylindrischen Abschnitt, so kann die Arbeitsleitung 14 durch einfacheε Einεtecken in daε Anεchlu߬ teil 24 und die Federhülεe 41 montiert werden.In the exemplary embodiment according to FIG. 10, the fastening means is a spring sleeve 41 which is slit once or several times and thereby forms elastically deformable expansion parts 42. With the expansion parts 42, the connecting line 14 is clamped over the collar 32 against a shoulder 43 in the interior of the connection part 24. If the outside diameter of the collar 32 is made smaller than the inside diameter of the spring sleeve 41 in its cylindrical section, the working line 14 can be installed by simply plugging it into the connecting part 24 and the spring sleeve 41.
ERSATZBLATT In dem Ausführungεbeispiel nach Fig. 11 wird das Be¬ festigungsmittel durch das Anschlußteil 24 selbst gebildet. Dies wird dadurch erreicht, daß das freie Ende des Anschlu߬ teiles 24 durch Kaltumformung um den Bund 32 der Arbeits¬ leitung 14 herum verformt wird. Genauso ist es jedoch mög¬ lich, daε freie Ende deε Anεchlußteileε 24 in die Ring¬ nut 33 der Arbeitsleitung 14 einzuformen.REPLACEMENT LEAF 11, the fastening means is formed by the connecting part 24 itself. This is achieved in that the free end of the connecting part 24 is deformed by cold forming around the collar 32 of the working line 14. However, it is equally possible to mold the free end of the connecting part 24 into the annular groove 33 of the working line 14.
Um eine leckölfreie Verbindung der Anschlußleitung 14 an daε Anεchlußteil 24 zu erreichen, iεt eε zweckmäßig, daß in allen Ausführungsbeiεpielen ein Dichtring 45 im Inneren des Anschlußteiles 24 angeordnet ist.In order to achieve a leak-free connection of the connecting line 14 to the connecting part 24, it is expedient that a sealing ring 45 is arranged in the interior of the connecting part 24 in all exemplary embodiments.
ERSATZBLATT Bezu szeichenREPLACEMENT LEAF Reference sign
Figure imgf000010_0001
Figure imgf000010_0001
ERSATZBLATT REPLACEMENT LEAF

Claims

A n s p r ü c h e Expectations
1. Zahnstangen-Hilfskraftlenkung, insbesondere für1. Power assisted rack and pinion steering, especially for
Kraftf hrzeuge, mit folgenden Merkmalen: in einem Lenkgehäuse (1) ist ein Ritzel (2) drehbar gelagert, eine in dem Lenkgehäuse (1) axial verschiebbar geführte Zahnεtange (6) wird durch ein federbelaεteteε Druckεtück (7) in Eingriff mit dem Ritzel (2) gehalten, zur Hilfskraftunterstützung ist ein Servomotor (8) an¬ geordnet, dessen Kolbenstange (10) trieblich mit der Zahnstange (6) verbunden iεt, eine Steuereinrichtung (18) zur Steuerung eines Druckmittels zu und von dem Servomotor (8) iεt in Abhängigkeit von einer Bewegung deε Ritzels (2) verεtellbar, die beiden Arbeitsräume (12, 13) des Servomotors (8) sind mit der Steuereinrichtung (18) über zwei Arbeits¬ leitungen (14, 15) verbunden, die an einen Zylinder (11) des Servomotors (8) und an die Steuereinrichtung (18) über Anschlußteile (24, 25) angeschlossen und, ebenso wie eine Druckleitung (26) von einer Servopumpe (21) und eine Rücklaufleitung (27) an einen Behälter (23), durch Befeεtigungsmittel an den Anschlußteilen (24, 25) gehalten sind, dadurch g e k e n n z e i c h n e t , daß jede Arbeitε-, Druck- und/oder Rücklaufleitung (14, 15, 26, 27) an ihrem freien Ende einen ringförmigen, in seiner axialen Länge begrenzten Bereich vergrößerten oder verkleinerten Durchmessers in der Form eines Bundes (32) bzw. einer Ringnut (33) aufweist,Motor vehicles with the following features: a pinion (2) is rotatably mounted in a steering housing (1), a toothed rack (6) guided axially displaceably in the steering housing (1) is engaged by the spring-loaded pressure piece (7) with the pinion ( 2), a servo motor (8) is arranged for auxiliary power support, the piston rod (10) of which is operatively connected to the rack (6), a control device (18) for controlling a pressure medium to and from the servo motor (8) is in Depending on a movement of the pinion (2), the two working spaces (12, 13) of the servo motor (8) are connected to the control device (18) via two working lines (14, 15) connected to a cylinder (11) of the servo motor (8) and to the control device (18) via connecting parts (24, 25) and, like a pressure line (26) from a servo pump (21) and a return line (27) to a container (23), by means of fastening means to the connection ßteile (24, 25) are held, characterized in that each working, pressure and / or return line (14, 15, 26, 27) at its free end has an annular area with an enlarged or reduced diameter in its axial length has the shape of a collar (32) or an annular groove (33),
ERSATZBLATT daß jede Arbeitε-, Druck- und/oder Rücklaufleitung (14, 15, 26, 27) durch ein den Bund (32) übergreifendes bzw. in die Ringnut (33) eingreifendes Befestigungsmittel an dem Anschlußteil (24, 25) gehalten iεt und daß daε Befeεtigungsmittel nach der Montage elastisch oder plastiεch verformt ist.REPLACEMENT LEAF that each working, pressure and / or return line (14, 15, 26, 27) is held on the connecting part (24, 25) by a fastening means which engages over the collar (32) or engages in the annular groove (33) and that that the fastening means is elastically or plastically deformed after assembly.
2. Zahnstangen-Hilfskraftlenkung nach Anspruch 1, dadurch g e k e n n z e i c h n e t , daß das Befesti¬ gungsmittel an dem Anschlußteil (24, 25) unter Vorspannung befestigt ist.2. Power assisted rack and pinion steering according to claim 1, characterized in that the fastening means is fastened to the connecting part (24, 25) under pretension.
3. Zahnstangen-Hilfεkraftlenkung nach Anspruch 2, dadurch g e k e n n z e i c h n e t , daß das Befesti- gungεmittel eine Halteεpange (34) ist mit wenigstens einem elastiεchen Klemmteil (36), daε in eine Hinterschneidung (31) am freien Ende des Anschlußteilε (24, 25) eingreift.3. Rack and power steering according to claim 2, characterized in that the fastening means is a retaining clip (34) with at least one elastic clamping part (36), which engages in an undercut (31) at the free end of the connecting part (24, 25) .
4. Zahnstangen-Hilfεkraftlenkung nach Anspruch 3, dadurch g e k e n n z e i c h n e t , daß die Halte¬ εpange (34) wenigstenε einen lappenförmigen, federnden Fort- εatz (35, 37) trägt, der, daε Anεchlußteil (24, 25) über¬ greifend bzw. umgreifend, die Halteεpange (34) nach der Montage an dem Anschlußteil (24, 25) einrastend hält (Fig. 7),4. Auxiliary rack and pinion steering according to claim 3, characterized in that the Halt¬ εpange (34) least at least a lobe-shaped, resilient extension ε extension (35, 37), which daε connecting part (24, 25) overlapping or encompassing holds the retaining clip (34) after assembly on the connecting part (24, 25) in a latching manner (FIG. 7),
5. Zahnstangen-Hilfskraftlenkung nach Anspruch 3, dadurch g e k e n n z e i c h n e t , daß die Halte¬ εpange (34) wenigεtenε einen lappenförmigen Fortsatz (35) trägt, der nach der Montage zur Sicherung plastisch verformt gegen das Anεchlußteil (24, 25) gebogen wird (Fig. 4B) .5. Power assisted rack and pinion steering according to claim 3, characterized in that the holding bracket (34) carries a little tab-shaped extension (35) which, after mounting, is plastically deformed against securing against the connecting part (24, 25) (Fig. 4B).
6. Zahnεtangen-Hilfεkraftlenkung nach Anspruch 2, dadurch g e k e n n z e i c h n e t , daß das Befesti¬ gungsmittel ein Sprengring (38) iεt, der in eine im Inneren deε Anεchlußteileε (24) liegende ringförmige Ausnehmung bzw. Ringnut (40) eingreift (Fig. 8, 9).6. rack and pinion power steering according to claim 2, characterized in that the fastening means a snap ring (38) iεt which engages in an inside of the connecting part (24) lying annular recess or annular groove (40) (Fig. 8, 9th ).
ERSATZBLATT REPLACEMENT LEAF
7. Zahnstangen-Hilfskraftlenkung nach Anspruch 2, dadurch g e k e n n z e i c h n e t , daß das Befesti- gungεmittel eine Federhülεe (41) mit elastiεch verformbaren Spreizteilen (42) iεt (Fig. 10).7. power assisted rack and pinion steering according to claim 2, characterized in that the fastening means is a spring sleeve (41) with elastically deformable expansion parts (42) (Fig. 10).
8. Zahnεtangen-Hilfεkraftlenkung nach Anεpruch 1, dadurch g e k e n n z e i c h n e t , daß das Befesti- gungεmittel durch das Anschlußteil (24, 25) dadurch gebildet wird, daß das freie Ende (44) des Anschlußteileε (24, 25) durch Kaltumformung um den Bund (32) bzw. in die Ring¬ nut (33) der Arbeitsleitung (24, 25) verformt wird (Fig. 11),8. Rack and pinion power steering according to claim 1, characterized in that the fastening means is formed by the connecting part (24, 25) in that the free end (44) of the connecting part (24, 25) is formed by cold forming around the collar (32 ) or is deformed into the annular groove (33) of the working line (24, 25) (FIG. 11),
9. Zahnstangen-Hilfskraftlenkung nach Anspruch 1, dadurch g e k e n n z e i c h n e t , daß daε Befesti- gungεmittel in daε Anεchlußteil (24, 25) einrastend oder ein¬ schnappend montiert wird, so daß die Arbeitε-, Druck- und/ oder Rücklaufleitung (14, 15, 26, 27) durch einen einfachen Schiebe- bzw. Einεteckvorgang deε Befeεtigungεmittels bzw. der Arbeitε-, Druck- und/oder Rücklaufleitung (14, 15, 26, 27) oder beider montierbar iεt.9. power assisted rack and pinion steering according to claim 1, characterized in that daε fastening means in daε connection part (24, 25) is snapped or snapped so that the working line, pressure and / or return line (14, 15, 26, 27) can be assembled by a simple pushing or inserting process of the fastening means or the working, pressure and / or return line (14, 15, 26, 27) or both.
ERSATZBLATT REPLACEMENT LEAF
PCT/EP1993/003072 1992-11-06 1993-11-02 Power-assisted rack and pinion steering system, especially for motor vehicles WO1994011231A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924237481 DE4237481A1 (en) 1992-11-06 1992-11-06 Rack and pinion power steering, in particular for motor vehicles
DEP4237481.2 1992-11-06

Publications (1)

Publication Number Publication Date
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Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995030568A1 (en) * 1994-05-05 1995-11-16 Zf Friedrichshafen Ag Rack and pinion power steering gear, in particular for motor vehicles
US6382343B1 (en) * 1998-04-22 2002-05-07 Trw Inc. Power steering apparatus
DE19832865A1 (en) * 1998-07-22 2000-01-27 Zahnradfabrik Friedrichshafen Process to locate and secure a pipe within a cylinder forming part of a hydro steering gear requires fewer components and fitting tools
AT3081U1 (en) * 1999-04-07 1999-09-27 Hoerbiger Hydraulik PRESSURE SYSTEM, PRESSURE CYLINDER AND CLAMP
DE19928025A1 (en) * 1999-06-18 2000-12-21 Mercedes Benz Lenkungen Gmbh Connection for pipes of power steering system in motor vehicles has sleeve-shaped clamp spring around pipe end to lock it in bore against pulling-out
CH705415A2 (en) 2011-08-16 2013-02-28 Peter A Mueller Fluid port.
CH705623A2 (en) 2011-09-29 2013-04-15 Peter A Mueller Plug-in coupling for fluid and / or electricity.
DE102016101458A1 (en) * 2016-01-27 2017-07-27 Volkswagen Aktiengesellschaft Arrangement of a fixing element on a fluid line and fixing

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GB2086514A (en) * 1980-10-30 1982-05-12 Gen Motors Corp Quick-connect hydraulic coupling assemblies
FR2504485A1 (en) * 1981-04-22 1982-10-29 Renault Rack and pinion vehicle steering - has rack connected to hydraulic cylinders with flow valves controlled by rack position
EP0306126A1 (en) * 1987-09-04 1989-03-08 U.S. Plastics Corporation Quick connect coupling
US5105787A (en) * 1991-08-05 1992-04-21 Siemens Automotive L.P. Internal combustion engine fuel rail assembly joint

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2086514A (en) * 1980-10-30 1982-05-12 Gen Motors Corp Quick-connect hydraulic coupling assemblies
FR2504485A1 (en) * 1981-04-22 1982-10-29 Renault Rack and pinion vehicle steering - has rack connected to hydraulic cylinders with flow valves controlled by rack position
EP0306126A1 (en) * 1987-09-04 1989-03-08 U.S. Plastics Corporation Quick connect coupling
US5105787A (en) * 1991-08-05 1992-04-21 Siemens Automotive L.P. Internal combustion engine fuel rail assembly joint

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DE4415841A1 (en) 1995-11-09

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