WO2014040691A1 - Spindle drive - Google Patents

Spindle drive Download PDF

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Publication number
WO2014040691A1
WO2014040691A1 PCT/EP2013/002539 EP2013002539W WO2014040691A1 WO 2014040691 A1 WO2014040691 A1 WO 2014040691A1 EP 2013002539 W EP2013002539 W EP 2013002539W WO 2014040691 A1 WO2014040691 A1 WO 2014040691A1
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WO
WIPO (PCT)
Prior art keywords
bearing
spindle
fixing element
webs
frame
Prior art date
Application number
PCT/EP2013/002539
Other languages
German (de)
French (fr)
Inventor
Artur Klein
Christian Hoika
Original Assignee
Trw Automotive 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 Trw Automotive Gmbh filed Critical Trw Automotive Gmbh
Publication of WO2014040691A1 publication Critical patent/WO2014040691A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/02—Semi-passive restraint systems, e.g. systems applied or removed automatically but not both ; Manual restraint systems
    • B60R22/03—Means for presenting the belt or part thereof to the wearer, e.g. foot-operated
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C11/00—Pivots; Pivotal connections
    • F16C11/04—Pivotal connections
    • F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
    • F16C11/0604—Construction of the male part
    • F16C11/0609—Construction of the male part made from two or more parts
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C11/00—Pivots; Pivotal connections
    • F16C11/04—Pivotal connections
    • F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
    • F16C11/08—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints with resilient bearings
    • F16C11/083—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints with resilient bearings by means of parts of rubber or like materials
    • F16C11/086—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints with resilient bearings by means of parts of rubber or like materials with an elastomeric member in the blind end of a socket
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/10—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for axial load mainly
    • F16C19/12—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for axial load mainly for supporting the end face of a shaft or other member, e.g. footstep bearings
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C21/00—Combinations of sliding-contact bearings with ball or roller bearings, for exclusively rotary movement
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
    • F16C25/02—Sliding-contact bearings
    • F16C25/04—Sliding-contact bearings self-adjusting

Definitions

  • the invention relates to a spindle drive, in particular for a seat belt buckle for a safety belt system of a vehicle, with a frame, a spindle, a radial bearing for the spindle and a fixing element for axial fixation of the radial bearing of the spindle in the frame.
  • Such spindle drives are known for a variety of applications.
  • Sprocket drives for seatbelt belt buckle charms are well known in the art and serve to move the buckle to apply the seatbelt to a comfort position in which the insertion of the tongue into the buckle is facilitated and after the seatbelt is applied to a hold position.
  • the spindle is mounted radially in a frame of Gurtschbringers by means of a radial bearing and with the end facing away from the drive axially on the frame. The radial bearing thereby fixes the spindle centrally in the context of Gurtschringers.
  • the radial bearing consists of a softer, annular metal element through which the spindle extends. With the help of a fixing element, the radial bearing is acted upon and axially fixed to a stop in the frame.
  • the spindle was previously with its free end on the frame of Gurtschbringers and supported on this. This led to increased wear on the thrust bearing when the spindle has been rotated by the drive to move the buckle.
  • the object of the invention is therefore to provide a spindle drive with an improved axial bearing of the spindle.
  • a spindle drive in particular provided for a seat belt buckle for a safety belt system of a vehicle, with a frame, a spindle, a radial bearing for the spindle and a fixing element for axial fixation of the radial bearing of the spindle in the frame, wherein the fixing part of a Thrust bearing of the spindle is.
  • the invention is based on the idea that the spindle of the spindle drive is at least partially axially mounted on the fixing element, which serves to fix the radial bearing of the spindle. This avoids that the spindle abuts axially directly on the frame of the spindle drive, whereby increased wear of the spindle occur.
  • the fixing thus continues to fix the radial bearing for the spindle and is also part of the thrust bearing of the spindle in the frame.
  • the fixing element has a bearing element of the axial bearing of the spindle.
  • the spindle is provided with a bearing surface which bears against the bearing element of the fixing element. Due to the design of a bearing surface on the spindle, no further component is necessary, which must be mounted between the bearing element and the spindle. The contact between the spindle and the bearing element of the fixing element is correspondingly immediate.
  • the thrust bearing is a tip bearing.
  • the design of the thrust bearing as a tip bearing is particularly advantageous because a tip bearing is typically very wear and low friction, whereby the durability of the spindle drive and the axial spindle bearing is improved.
  • the spindle has a bearing ball which bears against the bearing element of the fixing element.
  • a bearing ball is a hardened standard part, and thus not the entire spindle must be cured, which would be problematic from a technical point of view.
  • the fixing element has a plurality of webs, which bear against the radial bearing of the spindle. This results in an improved axial bearing of the radial bearing, since this can be applied uniformly by a plurality of webs.
  • a fixing element for a spindle drive of the type described above is provided with a frame member and a plurality of webs for springing a radial bearing of the spindle, wherein at least one of the webs has a bearing element which is part of the axial bearing of the spindle.
  • the webs are made in one piece with the frame element. This simplifies the production, since there are no tolerances during assembly, which could have a negative effect on the operation of the spindle drive. In addition, it is ensured by the one-piece design that no assembly of the webs is carried out on the frame member and required holding or fixing means must be used.
  • the webs are elastically deformable relative to the frame member.
  • This elastic deformability of the webs the webs can spring the radial bearing of the spindle.
  • This also guarantees that the radial bearing can tilt slightly from its intended position, provided that a corresponding load is exerted on the spindle, without leaving damage to the fixing.
  • it increases the tolerance margin in the production of the individual parts, since the components such as spindle and fixing element do not need to be matched exactly.
  • the webs extend inwardly toward the center of the fixing element.
  • the spindle which is enclosed by the fixing element, can be stored centrically, since the webs extend to the axial springing of the radial bearing to the center of the fixing, where the spindle and the spindle enclosing radial bearings are mounted.
  • the spindle is therefore on the central axis of the fixing.
  • the bearing element is located in the middle of the fixing element. Since the spindle is arranged in the center of the fixing element, and the axial bearing is formed with the bearing element of the fixing element, it is advantageous if the bearing element is arranged in the middle of the fixing element.
  • the spindle which extends centrally through the fixing element, thus abuts axially on the centrally arranged bearing element. The vertical arrangement of the bearing surface of the spindle to the contact surface of the bearing element is thus ensured.
  • the bearing element is designed in one piece with one of the webs.
  • the one-piece design of the bearing element with one of the webs guarantees that no unwanted mounting tolerances occur, which are disadvantageous in terms of the exact storage of the spindle.
  • the bearing element is elastically flexible relative to the web. This means that while the bearing element may be integrally formed with one of the webs, but still can be bent relative to this web and can rest against the frame, regardless of the position of the radial bearing and the spindle.
  • the frame element has a substantially circular cross-section and is in particular a clamping ring.
  • the design as a clamping ring has the advantage that the fixing element can be clamped, whereby a secure hold of the fixing is ensured.
  • the fixing element consists of spring steel.
  • Spring steel is a material that is very well suited in terms of wear resistance, because it has a very high strength and is thus particularly well suited for use in a thrust bearing. Further features and advantages of the invention will become apparent from the following description and from the following drawings, to which reference is made. In the drawings show:
  • FIG. 1 shows a sectional view of a spindle drive according to the invention in a seatbelt fastener
  • FIG. 2 shows a sectional view of a bearing at one end of the spindle of the spindle drive in a belt-lock driver of FIG. 1, and FIG.
  • FIG. 3 is a perspective view of a fixing element used in the bearing shown in FIG.
  • FIG. 1 shows a sectional view of a buckle feeder 10 which has a frame 12.
  • a spindle 14 is mounted, which is driven by a drive, not shown.
  • the drive is arranged at a first end 16 of the spindle 14.
  • the spindle 14 is mounted on the frame 12 of the Gurtschbringers 10 with a bearing 19. Details of the storage 19 will be explained with reference to FIG.
  • FIG. 2 shows a sectional view of the bearing 19 of the spindle 14 at the end 18.
  • the bearing 19 is on the one hand a thrust bearing 20, which is formed by the contact of a running at the end of the spindle 14 bearing surface 22 in the form of a hardened bearing ball 24 with the frame 12.
  • the bearing 19 has a radial bearing 26 which is mounted radially in the frame 12.
  • a fixing element 28 is provided, which on the one hand springs the radial bearing 26 and on the other part of the thrust bearing 20.
  • the fixing element 28 is arranged between the bearing ball 24 and the frame 12.
  • the spindle 14 has, at one end 18, the bearing ball 24, which rests against a bearing element 30 of the fixing element 28 and is supported by the bearing element 30 on the frame 12. Due to the configuration of the bearing surface 22 of the spindle 14 as a bearing ball 24, the thrust bearing 20 is designed as a top bearing, since only a point contact between the bearing element 30 and the spindle 14 and its bearing surface 22 is formed in the form of the bearing ball 24.
  • the fixing member 28 further has webs 32 which jib the radial bearing 26 of the spindle 14 and the radial bearing 26 axially against a stop 34 of the frame 12, so that the radial bearing 26 is mounted axially backlash. For this purpose, the webs 32 are elastically formed so as to allow the springing of the radial bearing 26.
  • the fixing element 28 is accordingly arranged for fixing the radial bearing 26 and as part of the axial bearing 20 in the frame 12 of the buckle feeder 10.
  • FIG. 3 shows the fixing element 28 used in the storage 19 in a perspective view. From the figure shows that the fixing element 28 has a frame member 36 on which the webs 32 are arranged. The webs 32 extend from the frame member 36 in the center of the fixing element 28. On one of the webs 32, the bearing element 30 is formed, which serves for the axial support of the spindle 14.
  • the fixing element 28 is formed in one piece, which means that the bearing element 30, the webs 32 and the frame member 36 are made of a material, whereby tolerances during assembly are avoided.
  • the bearing element 30 is nonetheless flexibly arranged on one of the webs 32, so that the bearing element 30 is always located on the frame 12 of the buckle feeder 10, regardless of the position of the radial bearing 26 or the spindle 14 and thus of the fixing element 28.
  • the webs 32 themselves are also arranged flexibly on the frame member 36, which is ultimately also realized by the recesses 38.
  • the axial springing of the radial bearing 26 is made possible or improved against the stop 34.
  • the frame element 36 itself has a circular cross-section and is designed as a clamping ring.
  • the fixing element 28 can be connected in a clamping manner to the frame 12, whereby the mounting of the fixing element 28 in the frame 12 is improved. Due to its elasticity, the fixing element 28 is clamped between supporting surfaces 40 of the frame 12 and the frame 12 itself.
  • a spindle drive in particular for Gurtschbringer 10 is provided for a safety belt system of a vehicle, which has a higher resistance of the axial bearing of the spindle 14 due to the configuration of the fixing element 28 with the bearing element 30.

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Abstract

The invention relates to a spindle drive, in particular for a belt lock presenter (10) for a safety belt system of a vehicle, comprising a frame (12), a spindle (14), a radial bearing (26) for the spindle (14) and a fixing element (28) for axially fixing the radial bearing (26) of the spindle (14) in the frame (12), wherein the fixing element (28) is part of an axial bearing (20) of the spindle (14).

Description

Spindelantrieb  spindle drive
Die Erfindung betrifft einen Spindelantrieb, insbesondere für einen Gurtschlossbringer für ein Sicherheitsgurtsystem eines Fahrzeugs, mit einem Rahmen, einer Spindel, einem Radiallager für die Spindel und einem Fixierelement zur axialen Fixierung des Radiallagers der Spindel im Rahmen. The invention relates to a spindle drive, in particular for a seat belt buckle for a safety belt system of a vehicle, with a frame, a spindle, a radial bearing for the spindle and a fixing element for axial fixation of the radial bearing of the spindle in the frame.
Derartige Spindelantriebe sind für eine Vielzahl von Anwendungsfällen bekannt. Spindelantriebe für Gurtschlossbringer für Sicherheitsgurtsysteme sind aus dem Stand der Technik bekannt und dienen dazu, das Gurtschloss zum Anlegen des Sicherheitsgurts in eine Komfortposition, in der das Einstecken der Steckzunge in das Gurtschloss erleichtert wird, und nach dem Anlegen des Sicherheitsgurts in eine Halteposition zu bewegen. Typischerweise wird dabei die Spindel zum Verfahren des Gurtschlosses verwendet wird und von einem Antrieb angetrieben wird. Die Spindel ist dabei in einem Rahmen des Gurtschlossbringers mittels eines Radiallagers radial und mit dem vom Antrieb abgewandten Ende axial am Rahmen gelagert. Das Radiallager fixiert dabei die Spindel zentrisch im Rahmen des Gurtschlossbringers. Zumeist besteht das Radiallager aus einem weicheren, ringförmigen Metallelement, durch welches die Spindel sich erstreckt. Mit Hilfe eines Fixierelements wird das Radiallager an einem Anschlag im Rahmen axial beaufschlagt und fixiert. Zur axialen Lagerung der Spindel im Rahmen des Gurtschlossbringers lag die Spindel bisher mit ihrem freien Ende am Rahmen des Gurtschlossbringers an und stützte sich an diesem ab. Dabei kam es zu erhöhten Verschleißerscheinungen am Axiallager, wenn die Spindel vom Antrieb in Drehung versetzt worden ist, um das Gurtschloss zu bewegen. Aufgabe der Erfindung ist es daher, einen Spindelantrieb mit einer verbesserten Axiallagerung der Spindel zu schaffen. Such spindle drives are known for a variety of applications. Sprocket drives for seatbelt belt buckle charms are well known in the art and serve to move the buckle to apply the seatbelt to a comfort position in which the insertion of the tongue into the buckle is facilitated and after the seatbelt is applied to a hold position. Typically, while the spindle is used for moving the buckle and is driven by a drive. The spindle is mounted radially in a frame of Gurtschlossbringers by means of a radial bearing and with the end facing away from the drive axially on the frame. The radial bearing thereby fixes the spindle centrally in the context of Gurtschlossbringers. In most cases, the radial bearing consists of a softer, annular metal element through which the spindle extends. With the help of a fixing element, the radial bearing is acted upon and axially fixed to a stop in the frame. For axial storage of the spindle in the context of Gurtschlossbringers the spindle was previously with its free end on the frame of Gurtschlossbringers and supported on this. This led to increased wear on the thrust bearing when the spindle has been rotated by the drive to move the buckle. The object of the invention is therefore to provide a spindle drive with an improved axial bearing of the spindle.
Zur Lösung dieser Aufgabe ist erfindungsgemäß ein Spindelantrieb, insbesondere für einen Gurtschlossbringer für ein Sicherheitsgurtsystem eines Fahrzeugs vorgesehen, mit einem Rahmen, einer Spindel, einem Radiallager für die Spindel und einem Fixierelement zur axialen Fixierung des Radiallagers der Spindel im Rahmen, wobei das Fixierelement Teil eines Axiallagers der Spindel ist. Die Erfindung beruht auf dem Gedanken, dass die Spindel des Spindelantriebs am Fixierelement, das zur Fixierung des Radiallagers der Spindel dient, zumindest teilweise axial gelagert ist. Dadurch wird vermieden, dass die Spindel axial direkt am Rahmen des Spindelantriebs anliegt, wodurch erhöhte Verschleißerscheinungen der Spindel auftreten. Das Fixierelement fixiert demnach weiterhin das Radiallager für die Spindel und ist gleichzeitig Teil des Axiallagers der Spindel im Rahmen. Insbesondere weist das Fixierelement ein Lagerelement des Axiallagers der Spindel auf. Dies bietet den Vorteil, dass bei der Montage des Fixierelements für die Fixierung des Radiallagers automatisch das Lagerelement für das Axiallager montiert wird. Somit ist kein zusätzliches Bauteil für das Axiallager von Nöten, das den Aufwand beim Zusammenbau des Gurtschlossbringers zusätzlich erhöhen würde. To solve this problem, a spindle drive according to the invention, in particular provided for a seat belt buckle for a safety belt system of a vehicle, with a frame, a spindle, a radial bearing for the spindle and a fixing element for axial fixation of the radial bearing of the spindle in the frame, wherein the fixing part of a Thrust bearing of the spindle is. The invention is based on the idea that the spindle of the spindle drive is at least partially axially mounted on the fixing element, which serves to fix the radial bearing of the spindle. This avoids that the spindle abuts axially directly on the frame of the spindle drive, whereby increased wear of the spindle occur. The fixing thus continues to fix the radial bearing for the spindle and is also part of the thrust bearing of the spindle in the frame. In particular, the fixing element has a bearing element of the axial bearing of the spindle. This offers the advantage that when mounting the fixing element for the fixation of the radial bearing automatically the bearing element for the thrust bearing is mounted. Thus, no additional component for the thrust bearing is needed, which would further increase the effort in assembling the Gurtschlossbringers.
Vorzugsweise ist die Spindel mit einer Lagerfläche versehen, die am Lagerelement des Fixierelements anliegt. Durch die Ausgestaltung einer Lagerfläche an der Spindel ist kein weiteres Bauteil nötig, welches zwischen Lagerelement und Spindel angebracht werden muss. Der Kontakt zwischen Spindel und Lagerelement des Fixierelements ist entsprechend unmittelbar. Preferably, the spindle is provided with a bearing surface which bears against the bearing element of the fixing element. Due to the design of a bearing surface on the spindle, no further component is necessary, which must be mounted between the bearing element and the spindle. The contact between the spindle and the bearing element of the fixing element is correspondingly immediate.
In einer besonders bevorzugten Ausführungsform ist das Axiallager ein Spitzenlager. Die Ausgestaltung des Axiallagers als Spitzenlager ist besonders vorteilhaft, da ein Spitzenlager typischerweise sehr verschleiß- und reibungsarm ist, wodurch die Haltbarkeit des Spindelantriebs bzw. der axialen Spindellagerung verbessert wird. In a particularly preferred embodiment, the thrust bearing is a tip bearing. The design of the thrust bearing as a tip bearing is particularly advantageous because a tip bearing is typically very wear and low friction, whereby the durability of the spindle drive and the axial spindle bearing is improved.
Vorzugsweise weist die Spindel eine Lagerkugel auf, die am Lagerelement des Fixierelements anliegt. Dadurch können die Kosten reduziert werden, da es sich bei einer derartigen Lagerkugel um ein gehärtetes Standardteil handelt, und somit nicht die komplette Spindel gehärtet werden muss, was auch aus technischer Sicht problematisch wäre. Preferably, the spindle has a bearing ball which bears against the bearing element of the fixing element. This can reduce costs as it costs In such a bearing ball is a hardened standard part, and thus not the entire spindle must be cured, which would be problematic from a technical point of view.
Insbesondere weist das Fixierelement mehrere Stege auf, die am Radiallager der Spindel anliegen. Dadurch ergibt sich eine verbesserte axiale Lagerung des Radiallagers, da dieses von mehreren Stegen gleichmäßiger beaufschlagt werden kann. In particular, the fixing element has a plurality of webs, which bear against the radial bearing of the spindle. This results in an improved axial bearing of the radial bearing, since this can be applied uniformly by a plurality of webs.
Darüber hinaus ist ein Fixierelement für einen Spindelantrieb der zuvor beschriebenen Art vorgesehen, mit einem Rahmenelement und mehreren Stegen zur Anfederung eines Radiallagers der Spindel, wobei wenigstens einer der Stege ein Lagerelement aufweist, das Teil des Axiallagers der Spindel ist. Die Anordnung des Lagerelements an einem der Stege, die das Radiallager anfedern, vereinfacht den Aufbau des Fixierelements und dessen Montage. Durch die Anfederung des Radiallagers der Spindel ist das Radiallager zudem axial spielfrei gelagert. In addition, a fixing element for a spindle drive of the type described above is provided with a frame member and a plurality of webs for springing a radial bearing of the spindle, wherein at least one of the webs has a bearing element which is part of the axial bearing of the spindle. The arrangement of the bearing element on one of the webs, which spring the radial bearing, simplifies the structure of the fixing and its assembly. Due to the springing of the radial bearing of the spindle, the radial bearing is also mounted axially backlash.
Vorzugsweise sind die Stege mit dem Rahmenelement einstückig ausgeführt. Dies vereinfacht die Fertigung, da keine Toleranzen bei der Montage auftreten, die sich negativ auf den Betrieb des Spindelantriebs auswirken könnten. Zudem ist durch die einstückige Ausführung gewährleistet, dass keine Montage der Stege am Rahmenelement durchzuführen ist und dafür benötigte Halte- bzw. Fixierungsmittel verwendet werden müssen. Preferably, the webs are made in one piece with the frame element. This simplifies the production, since there are no tolerances during assembly, which could have a negative effect on the operation of the spindle drive. In addition, it is ensured by the one-piece design that no assembly of the webs is carried out on the frame member and required holding or fixing means must be used.
Insbesondere sind die Stege relativ zu dem Rahmenelement elastisch verformbar. Durch diese elastische Verformbarkeit der Stege können die Stege das Radiallager der Spindel anfedern. Dies garantiert zudem, dass sich das Radiallager geringfügig aus seiner vorgesehenen Position verkippen kann, sofern eine entsprechende Last auf die Spindel ausgeübt wird, ohne Schäden am Fixierelement zu hinterlassen. Des Weiteren erhöht es den Toleranzspielraum bei der Fertigung der Einzelteile, da die Komponenten wie Spindel und Fixierelement nicht exakt aufeinander abgestimmt werden müssen. In einer bevorzugten Ausführungsform erstrecken sich die Stege nach innen in Richtung zum Mittelpunkt des Fixierelements. Dies garantiert, dass die Spindel, die vom Fixierelement umschlossen ist, zentrisch gelagert werden kann, da die Stege zur axialen Anfederung des Radiallagers zum Mittelpunkt des Fixierelements verlaufen, wo die Spindel und das die Spindel umschließende Radiallager gelagert sind. Die Spindel liegt demnach auf der Mittelachse des Fixierelements. Vorzugsweise befindet sich das Lagerelement in der Mitte des Fixierelements. Da die Spindel in der Mitte des Fixierelements angeordnet ist, und das axiale Lager mit dem Lagerelement des Fixierelements gebildet wird, ist es von Vorteil, wenn das Lagerelement in der Mitte des Fixierelements angeordnet ist. Die Spindel, die sich mittig durch das Fixierelement erstreckt, liegt somit axial am mittig angeordneten Lagerelement an. Die senkrechte Anordnung der Lagerfläche der Spindel zur Kontaktfläche des Lagerelements ist damit sichergestellt. In particular, the webs are elastically deformable relative to the frame member. This elastic deformability of the webs, the webs can spring the radial bearing of the spindle. This also guarantees that the radial bearing can tilt slightly from its intended position, provided that a corresponding load is exerted on the spindle, without leaving damage to the fixing. Furthermore, it increases the tolerance margin in the production of the individual parts, since the components such as spindle and fixing element do not need to be matched exactly. In a preferred embodiment, the webs extend inwardly toward the center of the fixing element. This guarantees that the spindle, which is enclosed by the fixing element, can be stored centrically, since the webs extend to the axial springing of the radial bearing to the center of the fixing, where the spindle and the spindle enclosing radial bearings are mounted. The spindle is therefore on the central axis of the fixing. Preferably, the bearing element is located in the middle of the fixing element. Since the spindle is arranged in the center of the fixing element, and the axial bearing is formed with the bearing element of the fixing element, it is advantageous if the bearing element is arranged in the middle of the fixing element. The spindle, which extends centrally through the fixing element, thus abuts axially on the centrally arranged bearing element. The vertical arrangement of the bearing surface of the spindle to the contact surface of the bearing element is thus ensured.
Insbesondere ist das Lagerelement einstückig mit einem der Stege ausgeführt. Die einstückige Ausführung des Lagerelements mit einem der Stege garantiert, dass keine unerwünschten Montagetoleranzen auftreten, die hinsichtlich der genauen Lagerung der Spindel von Nachteil sind. In particular, the bearing element is designed in one piece with one of the webs. The one-piece design of the bearing element with one of the webs guarantees that no unwanted mounting tolerances occur, which are disadvantageous in terms of the exact storage of the spindle.
Besonders bevorzugt ist das Lagerelement relativ zu dem Steg elastisch biegsam. Das bedeutet, dass das Lagerelement zwar einstückig mit einem der Stege ausgebildet sein kann, sich jedoch trotzdem relativ zu diesem Steg biegen lässt und am Rahmen anliegen kann, unabhängig von der Lage des Radiallagers und der Spindel. Particularly preferably, the bearing element is elastically flexible relative to the web. This means that while the bearing element may be integrally formed with one of the webs, but still can be bent relative to this web and can rest against the frame, regardless of the position of the radial bearing and the spindle.
Gemäß einer Ausführungsform weist das Rahmenelement einen im Wesentlichen kreisförmigen Querschnitt auf und ist insbesondere ein Klemmring. Die Ausführung als Klemmring bietet den Vorteil, dass das Fixierelement geklemmt werden kann, wodurch ein sicherer Halt des Fixierelements gewährleistet ist. According to one embodiment, the frame element has a substantially circular cross-section and is in particular a clamping ring. The design as a clamping ring has the advantage that the fixing element can be clamped, whereby a secure hold of the fixing is ensured.
Vorzugsweise besteht das Fixierelement aus Federstahl. Federstahl ist ein Material, das hinsichtlich der Verschleißbeständigkeit sehr gut geeignet ist, da es eine sehr hohe Festigkeit aufweist und somit für die Verwendung bei einem Axiallager besonders gut geeignet ist. Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung und aus den nachfolgenden Zeichnungen, auf die Bezug genommen wird. In den Zeichnungen zeigen: Preferably, the fixing element consists of spring steel. Spring steel is a material that is very well suited in terms of wear resistance, because it has a very high strength and is thus particularly well suited for use in a thrust bearing. Further features and advantages of the invention will become apparent from the following description and from the following drawings, to which reference is made. In the drawings show:
Figur 1 eine Schnittansicht eines erfindungsgemäßen Spindelantriebs in einem Gurtschlossbringers, FIG. 1 shows a sectional view of a spindle drive according to the invention in a seatbelt fastener,
Figur 2 eine Schnittansicht einer Lagerung an einem Ende der Spindel des Spindelantriebs in einem Gurtschlossbringer von Figur 1 , und FIG. 2 shows a sectional view of a bearing at one end of the spindle of the spindle drive in a belt-lock driver of FIG. 1, and FIG
- Figur 3 eine Perspektivansicht eines Fixierelements, das bei der in Fig. 2 gezeigten Lagerung verwendet wird. In Figur 1 ist eine Schnittansicht eines Gurtschlossbringers 10 gezeigt, der einen Rahmen 12 aufweist. Im Rahmen 12 ist eine Spindel 14 gelagert, welche über einen nicht dargestellten Antrieb angetrieben wird. Der Antrieb ist an einem ersten Ende 16 der Spindel 14 angeordnet. Am gegenüberliegenden Ende 18 ist die Spindel 14 am Rahmen 12 des Gurtschlossbringers 10 mit einer Lagerung 19 gelagert. Details der Lagerung 19 werden anhand der Figur 2 erläutert. FIG. 3 is a perspective view of a fixing element used in the bearing shown in FIG. FIG. 1 shows a sectional view of a buckle feeder 10 which has a frame 12. In frame 12, a spindle 14 is mounted, which is driven by a drive, not shown. The drive is arranged at a first end 16 of the spindle 14. At the opposite end 18, the spindle 14 is mounted on the frame 12 of the Gurtschlossbringers 10 with a bearing 19. Details of the storage 19 will be explained with reference to FIG.
In Figur 2 ist eine Schnittansicht der Lagerung 19 der Spindel 14 am Ende 18 gezeigt. Bei der Lagerung 19 handelt es sich einerseits um ein Axiallager 20, das durch den Kontakt einer am Ende der Spindel 14 ausgeführten Lagerfläche 22 in Form einer gehärteten Lagerkugel 24 mit dem Rahmen 12 ausgebildet ist. Andererseits weist die Lagerung 19 ein Radiallager 26 auf, das im Rahmen 12 radial gelagert ist. Zur Fixierung des Radiallagers 26 im Rahmen 12 ist ein Fixierelement 28 vorgesehen, welches zum Einen das Radiallager 26 anfedert und zum Anderen Teil des Axiallagers 20 ist. Das Fixierelement 28 ist dazu zwischen der Lagerkugel 24 und dem Rahmen 12 angeordnet. Die Spindel 14 weist an dem einen Ende 18 die Lagerkugel 24 auf, die an einem Lagerelement 30 des Fixierelements 28 anliegt und sich über das Lagerelement 30 am Rahmen 12 abstützt. Durch die Ausgestaltung der Lagerfläche 22 der Spindel 14 als Lagerkugel 24 ist das Axiallager 20 als Spitzenlager ausgeführt, da nur ein Punktkontakt zwischen dem Lagerelement 30 und der Spindel 14 bzw. ihrer Lagerfläche 22 in Form der Lagerkugel 24 ausgebildet ist. Das Fixierelement 28 verfügt weiterhin über Stege 32, die das Radiallager 26 der Spindel 14 anfedern und das Radiallager 26 gegen einen Anschlag 34 des Rahmens 12 axial beaufschlagen, so dass das Radiallager 26 axial spielfrei gelagert ist. Dazu sind die Stege 32 elastisch ausgebildet, um so das Anfedern des Radiallagers 26 zu ermöglichen. FIG. 2 shows a sectional view of the bearing 19 of the spindle 14 at the end 18. The bearing 19 is on the one hand a thrust bearing 20, which is formed by the contact of a running at the end of the spindle 14 bearing surface 22 in the form of a hardened bearing ball 24 with the frame 12. On the other hand, the bearing 19 has a radial bearing 26 which is mounted radially in the frame 12. For fixing the radial bearing 26 in the frame 12, a fixing element 28 is provided, which on the one hand springs the radial bearing 26 and on the other part of the thrust bearing 20. The fixing element 28 is arranged between the bearing ball 24 and the frame 12. The spindle 14 has, at one end 18, the bearing ball 24, which rests against a bearing element 30 of the fixing element 28 and is supported by the bearing element 30 on the frame 12. Due to the configuration of the bearing surface 22 of the spindle 14 as a bearing ball 24, the thrust bearing 20 is designed as a top bearing, since only a point contact between the bearing element 30 and the spindle 14 and its bearing surface 22 is formed in the form of the bearing ball 24. The fixing member 28 further has webs 32 which jib the radial bearing 26 of the spindle 14 and the radial bearing 26 axially against a stop 34 of the frame 12, so that the radial bearing 26 is mounted axially backlash. For this purpose, the webs 32 are elastically formed so as to allow the springing of the radial bearing 26.
Das Fixierelement 28 ist demnach für die Fixierung des Radiallagers 26 sowie als Teil des Axiallagers 20 im Rahmen 12 des Gurtschlossbringers 10 angeordnet. The fixing element 28 is accordingly arranged for fixing the radial bearing 26 and as part of the axial bearing 20 in the frame 12 of the buckle feeder 10.
Die Figur 3 zeigt das Fixierelement 28, das bei der Lagerung 19 verwendet wird, in einer Perspektivansicht. Aus der Figur geht hervor, dass das Fixierelement 28 ein Rahmenelement 36 aufweist, an dem die Stege 32 angeordnet sind. Die Stege 32 erstrecken sich vom Rahmenelement 36 in die Mitte des Fixierelements 28. An einem der Stege 32 ist das Lagerelement 30 ausgebildet, das zur axialen Lagerung der Spindel 14 dient. Das Fixierelement 28 ist dabei einstückig ausgebildet, was bedeutet, dass das Lagerelement 30, die Stege 32 sowie das Rahmenelement 36 aus einem Material hergestellt sind, wodurch Toleranzen bei der Montage vermieden werden. FIG. 3 shows the fixing element 28 used in the storage 19 in a perspective view. From the figure shows that the fixing element 28 has a frame member 36 on which the webs 32 are arranged. The webs 32 extend from the frame member 36 in the center of the fixing element 28. On one of the webs 32, the bearing element 30 is formed, which serves for the axial support of the spindle 14. The fixing element 28 is formed in one piece, which means that the bearing element 30, the webs 32 and the frame member 36 are made of a material, whereby tolerances during assembly are avoided.
Das Lagerelement 30 ist dennoch an einem der Stege 32 biegsam angeordnet, so dass sich das Lagerelement 30 immer flächendeckend am Rahmen 12 des Gurtschlossbringers 10 befindet, unabhängig von der Lage des Radiallagers 26 bzw. der Spindel 14 und somit des Fixierelements 28. The bearing element 30 is nonetheless flexibly arranged on one of the webs 32, so that the bearing element 30 is always located on the frame 12 of the buckle feeder 10, regardless of the position of the radial bearing 26 or the spindle 14 and thus of the fixing element 28.
Die Stege 32 selbst sind auch biegsam am Rahmenelement 36 angeordnet, was letztlich auch durch die Aussparungen 38 realisiert wird. Somit wird das axiale Anfedern des Radiallagers 26 gegen den Anschlag 34 ermöglicht bzw. verbessert. The webs 32 themselves are also arranged flexibly on the frame member 36, which is ultimately also realized by the recesses 38. Thus, the axial springing of the radial bearing 26 is made possible or improved against the stop 34.
Das Rahmenelement 36 selbst weist einen kreisförmigen Querschnitt auf und ist dabei als Klemmring ausgestaltet. Dadurch kann das Fixierelement 28 klemmend mit dem Rahmen 12 verbunden werden, wodurch die Lagerung des Fixierelements 28 im Rahmen 12 verbessert wird. Das Fixierelement 28 wird dabei aufgrund seiner Elastizität zwischen Abstützflächen 40 des Rahmens 12 und dem Rahmen 12 selbst geklemmt. Gemäß der Erfindung ist demnach einen Spindelantrieb, insbesondere für Gurtschlossbringer 10 für ein Sicherheitsgurtsystem eines Fahrzeugs geschaffen, der aufgrund der Ausgestaltung des Fixierelements 28 mit dem Lagerelement 30 eine höhere Widerstandsfähigkeit des axialen Lagers der Spindel 14 aufweist. The frame element 36 itself has a circular cross-section and is designed as a clamping ring. As a result, the fixing element 28 can be connected in a clamping manner to the frame 12, whereby the mounting of the fixing element 28 in the frame 12 is improved. Due to its elasticity, the fixing element 28 is clamped between supporting surfaces 40 of the frame 12 and the frame 12 itself. According to the invention, therefore, a spindle drive, in particular for Gurtschlossbringer 10 is provided for a safety belt system of a vehicle, which has a higher resistance of the axial bearing of the spindle 14 due to the configuration of the fixing element 28 with the bearing element 30.

Claims

Patentansprüche claims
1. Spindelantrieb, insbesondere für einen Gurtschlossbringer (10) für ein Sicherheitsgurtsystem eines Fahrzeugs, mit einem Rahmen (12), einer Spindel (14), einem Radiallager (26) für die Spindel (14) und einem Fixierelement (28) zur axialen Fixierung des Radiallagers (26) der Spindel (14) im Rahmen (12), dadurch gekennzeichnet, dass das Fixierelement (28) Teil eines Axiallagers (20) der Spindel (14) bildet. 1. Spindle drive, in particular for a belt buckle (10) for a safety belt system of a vehicle, with a frame (12), a spindle (14), a radial bearing (26) for the spindle (14) and a fixing element (28) for axial fixation the radial bearing (26) of the spindle (14) in the frame (12), characterized in that the fixing element (28) forms part of an axial bearing (20) of the spindle (14).
2. Spindelantrieb nach Anspruch 1 , dadurch gekennzeichnet, dass das Fixierelement (28) ein Lagerelement (30) des Axiallagers (20) der Spindel (14) aufweist. 2. Spindle drive according to claim 1, characterized in that the fixing element (28) has a bearing element (30) of the axial bearing (20) of the spindle (14).
3. Spindelantrieb nach Anspruch 2, dadurch gekennzeichnet, dass die Spindel (14) mit einer Lagerfläche (22) versehen ist, die am Lagerelement (30) des Fixierelements (28) anliegt. 3. Spindle drive according to claim 2, characterized in that the spindle (14) with a bearing surface (22) is provided, which rests on the bearing element (30) of the fixing element (28).
4. Spindelantrieb nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Axiallager (20) ein Spitzenlager ist. 4. Spindle drive according to one of the preceding claims, characterized in that the thrust bearing (20) is a tip bearing.
5. Spindelantrieb nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass die Spindel (14) eine Lagerkugel (24) aufweist, die an dem Lagerelement (30) des Fixierelements (28) anliegt. 5. Spindle drive according to one of claims 2 to 4, characterized in that the spindle (14) has a bearing ball (24) which bears against the bearing element (30) of the fixing element (28).
6. Spindelantrieb nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Fixierelement (28) mehrere Stege (32) aufweist, die am Radiallager (26) der Spindel (14) anliegen. 6. Spindle drive according to one of the preceding claims, characterized in that the fixing element (28) has a plurality of webs (32) which bear against the radial bearing (26) of the spindle (14).
7. Fixierelement (28) für einen Spindelantrieb, insbesondere für einen Gurtschlossbringer (10) nach einem der vorhergehenden Ansprüche, mit einem Rahmenelement (36) und mehreren Stegen (32) zur Anfederung eines Radiallagers (26) der Spindel (14), dadurch gekennzeichnet, dass wenigstens einer der Stege (32) ein Lagerelement (30) aufweist, das Teil des Axiallagers (20) der Spindel (14) ist. 7. fixing element (28) for a spindle drive, in particular for a Gurtschlossbringer (10) according to one of the preceding claims, comprising a frame member (36) and a plurality of webs (32) for springing a radial bearing (26) of the spindle (14), characterized in that at least one of the webs (32) has a bearing element (30) which is part of the axial bearing (20) of the spindle (14).
8. Fixierelement (28) nach Anspruch 7, dadurch gekennzeichnet, dass die Stege (32) mit dem Rahmenelement (36) einstückig ausgeführt sind. 8. fixing element (28) according to claim 7, characterized in that the webs (32) with the frame element (36) are made in one piece.
9. Fixierelement (28) nach einem der Ansprüche 7 und 8, dadurch gekennzeichnet, dass die Stege (32) relativ zu dem Rahmenelement (36) elastisch verformbar sind. 9. fixing element (28) according to any one of claims 7 and 8, characterized in that the webs (32) relative to the frame member (36) are elastically deformable.
10. Fixierelement (28) nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, dass die Stege (32) sich nach innen in Richtung zum Mittelpunkt des Fixierelements (28) erstrecken. 10. fixing element (28) according to any one of claims 7 to 9, characterized in that the webs (32) extend inwardly towards the center of the fixing element (28).
11. Fixierelement (28) nach einem der Ansprüche 7 bis 10, dadurch gekennzeichnet, dass das Lagerelement (30) sich in der Mitte des Fixierelements11. fixing element (28) according to one of claims 7 to 10, characterized in that the bearing element (30) in the middle of the fixing
(28) befindet. (28).
12. Fixierelement (28) nach einem der Ansprüche 7 bis 11 , dadurch gekennzeichnet, dass das Lagerelement (30) einstückig mit einem der Stege (32) ausgeführt ist. 12. fixing element (28) according to one of claims 7 to 11, characterized in that the bearing element (30) is integral with one of the webs (32).
13. Fixierelement (28) nach einem der Ansprüche 7 bis 12, dadurch gekennzeichnet, dass das Lagerelement (30) relativ zu dem Steg (32) elastisch biegsam ist. 13. fixing element (28) according to one of claims 7 to 12, characterized in that the bearing element (30) relative to the web (32) is elastically flexible.
14. Fixierelement (28) nach einem der Ansprüche 7 bis 13, dadurch gekennzeichnet, dass das Rahmenelement (36) einen im Wesentlichen kreisförmigen Querschnitt aufweist und insbesondere ein Klemmring ist. 14. Fixing element (28) according to one of claims 7 to 13, characterized in that the frame element (36) has a substantially circular cross section and in particular is a clamping ring.
15. Fixierelement (28) nach einem der Ansprüche 7 bis 15, dadurch gekennzeichnet, dass das Fixierelement (28) aus Federstahl besteht. 15. Fixing element (28) according to one of claims 7 to 15, characterized in that the fixing element (28) consists of spring steel.
PCT/EP2013/002539 2012-09-12 2013-08-22 Spindle drive WO2014040691A1 (en)

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DE102012017979.0A DE102012017979B4 (en) 2012-09-12 2012-09-12 spindle drive
DE102012017979.0 2012-09-12

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