EP1597741B1 - Switching shaft for a rotary switch - Google Patents

Switching shaft for a rotary switch Download PDF

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Publication number
EP1597741B1
EP1597741B1 EP04713891A EP04713891A EP1597741B1 EP 1597741 B1 EP1597741 B1 EP 1597741B1 EP 04713891 A EP04713891 A EP 04713891A EP 04713891 A EP04713891 A EP 04713891A EP 1597741 B1 EP1597741 B1 EP 1597741B1
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EP
European Patent Office
Prior art keywords
switching shaft
reinforcement
cams
switching
core
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04713891A
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German (de)
French (fr)
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EP1597741A1 (en
Inventor
Günther Reimold
Siegfried Mannuss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EGO Elektro Geratebau GmbH
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EGO Elektro Geratebau GmbH
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Publication of EP1597741A1 publication Critical patent/EP1597741A1/en
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Publication of EP1597741B1 publication Critical patent/EP1597741B1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/54—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand the operating part having at least five or an unspecified number of operative positions
    • H01H19/60—Angularly-movable actuating part carrying no contacts
    • H01H19/62—Contacts actuated by radial cams
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H2009/0088—Details of rotatable shafts common to more than one pole or switch unit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H3/42—Driving mechanisms, i.e. for transmitting driving force to the contacts using cam or eccentric

Definitions

  • the invention relates to a switching shaft for rotary switch according to the preamble of claim 1.
  • the switching shaft may have molded cams or cams and trigger switching contacts of the rotary switch.
  • a multi-layer shift shaft which has a core with a flattened D-profile, which can be inserted therein. From this, rib-like formations emerge at one end, which can serve to trigger switching functions.
  • DE 10044046 A1 shows a switching shaft with a shaft in which longitudinal webs are formed, wherein on the switching shaft lever parts are pushed.
  • the webs on the shank engage in grooves in the lever parts in order to ensure a security against rotation.
  • the webs are arranged around the shaft and evenly distributed.
  • the invention has for its object to improve a switching shaft mentioned above, in particular to improve the stability with optimized use of materials and production costs.
  • an aforementioned switching shaft on its outer side on a rib-shaped or rib-like reinforcement.
  • This runs in the axial direction and can absorb compressive stresses and, above all, tensile stresses in order to avoid bending of the selector shaft.
  • several such reinforcements form side by side in the same direction. With suitable dimensioning, however, in many cases already a single reinforcement rib suffices.
  • Particularly advantageous here is a one-piece molding of the reinforcement. As a result, the strength can be further increased.
  • the reinforcement can advantageously extend over a wide central region of the selector shaft, for example until shortly before the respective end of the selector shaft. For example, it can occupy 70% to 90% of the length of the selector shaft.
  • the switching shaft advantageously has a substantially constant cross section, apart from the cams or cams. In the region of the reinforcement, this cross-section is widened only by the additional cross-section of the reinforcement.
  • the reinforcement in rib form should preferably be continuous and integral with no breaks. On the one hand, it is possible to form the reinforcing rib with constant thickness or constant cross section. On the other hand, in certain areas in which local tensile stresses occur to an increased degree, a second reinforcing rib or a reinforcing rib with a larger 'cross section may be formed. It has proven to be advantageous if the reinforcement protrudes to an extent of the shift shaft, which is about 10% to 30%, in particular about 20%.
  • the reinforcement extends at a longitudinal region, which is opposite to a region particularly stressed by the cams or cams. This means that in order to be able to absorb the tensile stresses, the reinforcement should point in the direction of the force in which the strongest forces are exerted on the cams or cams in a specific rotational position. These forces Stirring of switch contacts or the like forth, which are operated or moved by the cams. In many cases, although switching contacts are moved in certain different rotational positions. Usually, however, there is a particularly concentrated or central area in which the aforementioned strongest forces can be detected.
  • the switching shaft is made such that it consists of plastic in an outer region or has an outer plastic layer.
  • the switching shaft on a core which consists for example either of different and more stable material or with a constant cross-section and thus simpler.
  • Shift shaft and / or core may be made of plastic, such as thermoplastic material.
  • the contour of the switching shaft or the outer region or the outer layer are applied to a core in a spraying process.
  • a shape of the core according to the invention has a flattened round profile, for example in D-shape. By deviating from a circular shape design an anti-rotation of the core and outer region or outer layer is achieved.
  • the reinforcement is formed in the region of the flattening of the round profile of the core or the core is arranged in this manner within the switching shaft. It is advantageous if the reinforcement does not protrude over the cross section of the round profile, which would correspond without flattening the steady course of the cross section. In other words, the shape and protrusion of the reinforcement should be tuned with the flattening of the core.
  • the layer thickness of an outer layer is small compared to the diameter of the core. Thereby, a possible risk of distortion of the entire shift shaft is reduced after the encapsulation of the core due to cooling.
  • Another aspect of the design of the shift shaft or the arrangement of the gain is that with the mass concentration representing a reinforcing rib other mass concentrations can be compensated, which can otherwise cause distortion during spraying of the shift shaft.
  • Such warping may be caused, for example, by the cams or cams typically being rigidly oriented in one direction or in one area. It is possible to determine a center of mass line of the cams or cams. With respect to the axis of rotation, as seen from this center of mass line, the reinforcement should extend to prevent or at least reduce warping by its own mass upon cooling of the stem after injection. In this way, long control shafts can be formed which better resist both warping during operation due to compressive forces and after an injection molding operation due to the rib-shaped reinforcement in certain embodiments of the invention.
  • a shift shaft 11 is shown in side view.
  • sectional drawings are shown at different locations with differently shaped cams. It can be seen how the long shift shaft 11 is formed by a base profile 13. At the base profile 13 different types of cams 15 are formed.
  • the cams 15 have in the illustrated embodiment, in principle, a maximum radius or are formed out of a circular disc with this maximum radius.
  • an incision 16 is taken out of the cam 15.
  • the cam plate 15 consists essentially of a disc with a very small radius over the base section 13 also. At this disc, a projection 17 is formed.
  • the switching contacts 19 may be a pure switching contacts, which open or close. Furthermore, as a switch contacts and variable-distance switch may be provided, for example, for thermal expansion switch with default setting of a switching path. In this case, the cams 15 not only graded radii, but a uniformly increasing or decreasing radius. Thus, depending on a rotation angle, the switching contacts 19 can be moved slowly and continuously.
  • a reinforcing rib 25 is formed upwardly facing. This has an approximately rectangular cross-section. From Fig. 3 it can be seen that it does not protrude beyond the radius of the other basic profile 13. From Fig. 1 it can be seen how it extends over the entire central region of the length of the switching shaft 11 and thus about 70% to 80% of the length of the switching shaft.
  • the reinforcing rib 25 in the position according to the figures is arranged exactly opposite the switching contacts 19 and the forces caused by them. Thus, it can effectively prevent bending of the shift shaft 11. Since the shift shaft 11 is usually mounted at both ends, this risk of bending in the middle is greatest. In this respect, the reinforcing rib 25 is in any case particularly advantageous in the middle region.
  • a shift shaft for a rotary switch can be provided which has molded cams or cams.
  • a reinforcing rib is provided, which extends in the axial direction to just before the ends of the switching shaft. This reinforcing rib can absorb tensile stresses, which are caused by pressure forces of switching contacts, especially in the central region of the switching shaft. Thus, a deflection of the shift shaft can be avoided.

Landscapes

  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Gear-Shifting Mechanisms (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Mechanical Control Devices (AREA)
  • Control Of Transmission Device (AREA)
  • Switches With Compound Operations (AREA)
  • Mechanical Operated Clutches (AREA)

Abstract

According to one embodiment of the invention, a switching shaft (11) comprising molded-on cams (17) or cam disks (15) can be created for a rotary switch. A reinforcement rib (25) which extends close to the ends of the switching shaft is provided on the outside of the switching shaft (11). Said reinforcement rib (25) is able to absorb tensile stress caused especially in the central area of the switching shaft (11) by pressure generated by switching contacts (19), allowing bending of the switching shaft (11) to be prevented.

Description

Anwendungsgebiet und Stand der TechnikField of application and state of the art

Die Erfindung betrifft eine Schaltwelle für Drehschalter gemäß dem Oberbegriff des Anspruchs 1. Die Schaltwelle kann dabei angeformte Nocken oder Nockenscheiben aufweisen und Schaltkontakte des Drehschalters auslösen.The invention relates to a switching shaft for rotary switch according to the preamble of claim 1. The switching shaft may have molded cams or cams and trigger switching contacts of the rotary switch.

Aus der EP 1 239 504 A1 ist eine mehrschichtig aufgebaute Schaltwelle bekannt, welche einen Kern mit abgeflachtem D-Profil aufweist, der darin eingesteckt werden kann. Daraus gehen rippenartige Ausbildungen an einem Ende hervor, welche zum Auslösen von Schaltfunktionen dienen können.From EP 1 239 504 A1, a multi-layer shift shaft is known, which has a core with a flattened D-profile, which can be inserted therein. From this, rib-like formations emerge at one end, which can serve to trigger switching functions.

Die DE 10044046 A1 zeigt eine Schaltwelle mit einem Schaft, in welchem längsverlaufende Stege ausgebildet sind, wobei auf die Schaltwelle Hebelteile aufgeschoben sind. Dabei greifen die Stege auf dem Schaft in Nuten in den Hebelteilen, um eine Verdrehsicherheit zu gewährleisten. Die Stege sind rund um den Schaft und gleichverteilt angeordnet.DE 10044046 A1 shows a switching shaft with a shaft in which longitudinal webs are formed, wherein on the switching shaft lever parts are pushed. In this case, the webs on the shank engage in grooves in the lever parts in order to ensure a security against rotation. The webs are arranged around the shaft and evenly distributed.

Aufgabe und LösungTask and solution

Der Erfindung liegt die Aufgabe zugrunde, eine eingangs genannte Schaltwelle zu verbessern, insbesondere bei optimiertem Materialeinsatz und Herstellungsaufwand die Stabilität zu verbessern.The invention has for its object to improve a switching shaft mentioned above, in particular to improve the stability with optimized use of materials and production costs.

Gelöst wird diese Aufgabe durch eine Schaltwelle mit den Merkmalen des Anspruchs 1. Vorteilhafte sowie bevorzugte Ausgestaltungen der Erfindung sind Gegenstand der weiteren Ansprüche und werden im folgenden näher erläutert. Der Wortlaut der Ansprüche wird durch ausdrückliche Bezugnahme zum Inhalt der Beschreibung gemacht.This object is achieved by a switching shaft with the features of claim 1. Advantageous and preferred embodiments of the invention are the subject of the other claims and will be in the following explained in more detail. The wording of the claims is incorporated herein by express reference.

Erfindungsgemäß weist eine eingangs genannte Schaltwelle an ihrer Außenseite eine rippenförmige oder rippenartige Verstärkung auf. Diese verläuft in axialer Richtung und kann Druckspannungen und vor allem Zugspannungen aufnehmen, um ein Durchbiegen der Schaltwelle zu vermeiden. Dabei ist es zwar einerseits möglich, mehrere solcher Verstärkungen nebeneinander in gleicher Richtung auszubilden. Bei geeigneter Dimensionierung reicht jedoch in vielen Fällen bereits eine einzige Verstärkungsrippe. Besonders vorteilhaft ist hier ein einstückiges Anformen der Verstärkung. Dadurch kann die Festigkeit weiter erhöht werden.According to the invention, an aforementioned switching shaft on its outer side on a rib-shaped or rib-like reinforcement. This runs in the axial direction and can absorb compressive stresses and, above all, tensile stresses in order to avoid bending of the selector shaft. Although it is possible on the one hand, several such reinforcements form side by side in the same direction. With suitable dimensioning, however, in many cases already a single reinforcement rib suffices. Particularly advantageous here is a one-piece molding of the reinforcement. As a result, the strength can be further increased.

Die Verstärkung kann vorteilhaft über einen breiten mittleren Bereich der Schaltwelle verlaufen, beispielsweise bis kurz vor das jeweilige Ende der Schaltwelle. So kann sie beispielsweise 70% bis 90% der Länge der Schaltwelle einnehmen.The reinforcement can advantageously extend over a wide central region of the selector shaft, for example until shortly before the respective end of the selector shaft. For example, it can occupy 70% to 90% of the length of the selector shaft.

Die Schaltwelle weist vorteilhaft einen im wesentlichen gleichbleibenden Querschnitt auf, wenn man von den Nocken oder Nockenscheiben absieht. Dieser Querschnitt wird jeweils im Bereich der Verstärkung lediglich um den zusätzlichen Querschnitt der Verstärkung erweitert.The switching shaft advantageously has a substantially constant cross section, apart from the cams or cams. In the region of the reinforcement, this cross-section is widened only by the additional cross-section of the reinforcement.

Die Verstärkung in Rippenform sollte bevorzugt durchgehend und einstückig sein ohne jegliche Unterbrechungen. Einerseits ist es möglich, die Verstärkungsrippe mit gleichbleibender Stärke bzw. gleichbleibendem Querschnitt auszubilden. Andererseits kann in gewissen Bereichen, in denen lokale Zugspannungen in erhöhtem Maße auftreten, eine zweite Verstärkungsrippe oder eine Verstärkungsrippe mit größerem' Querschnitt angeformt sein. Es hat sich als vorteilhaft herausgestellt, wenn die Verstärkung in einem Maß von der Schaltwelle abragt, welches ca. 10% bis 30%, insbesondere etwa 20%, beträgt.The reinforcement in rib form should preferably be continuous and integral with no breaks. On the one hand, it is possible to form the reinforcing rib with constant thickness or constant cross section. On the other hand, in certain areas in which local tensile stresses occur to an increased degree, a second reinforcing rib or a reinforcing rib with a larger 'cross section may be formed. It has proven to be advantageous if the reinforcement protrudes to an extent of the shift shaft, which is about 10% to 30%, in particular about 20%.

Vorteilhaft verläuft die Verstärkung an einem Längsbereich, welcher einem durch die Nocken oder Nockenscheiben besonders belasteten Bereich gegenüberliegt. Dies bedeutet, dass die Verstärkung, um die Zugspannungen aufnehmen zu können, in diejenige Kraftrichtung weisen sollte, in welcher in einer bestimmten Drehstellung die stärksten Kräfte auf die Nocken oder Nockenscheiben ausgeübt werden. Diese Kräfte rühren von Schaltkontakten oder dergleichen her, welche durch die Nocken betätigt oder bewegt werden. In vielen Fällen werden zwar in bestimmten verschiedenen Drehstellungen Schaltkontakte bewegt. Meistens gibt es jedoch einen besonders konzentrierten oder mittleren Bereich, in welchem die vorgenannten stärksten Kräfte festgestellt werden können.Advantageously, the reinforcement extends at a longitudinal region, which is opposite to a region particularly stressed by the cams or cams. This means that in order to be able to absorb the tensile stresses, the reinforcement should point in the direction of the force in which the strongest forces are exerted on the cams or cams in a specific rotational position. These forces Stirring of switch contacts or the like forth, which are operated or moved by the cams. In many cases, although switching contacts are moved in certain different rotational positions. Mostly, however, there is a particularly concentrated or central area in which the aforementioned strongest forces can be detected.

Die Schaltwelle ist derart hergestellt, dass sie in einem äußeren Bereich aus Kunststoff besteht bzw. eine äußere Kunststoff-Schicht aufweist. So weist die Schaltwelle einen Kern auf, der beispielsweise entweder aus anderem und stabilerem Material besteht oder aber mit gleichbleibendem Querschnitt und somit einfacher ausgebildet ist. Schaltwelle und/oder Kern können aus Kunststoff bestehen, beispielsweise thermoplastischem Material. Besonders vorteilhaft werden die Kontur der Schaltwelle bzw. der äußere Bereich oder die äußere Schicht in einem Spritzverfahren auf einen Kern aufgebracht. Als Form hat der Kern erfindungsgemäß ein abgeflachtes Rundprofil, beispielsweise in D-Form. Durch diese von einer kreisrunden Form abweichende Gestaltung wird eine Verdrehsicherung von Kern und äußerem Bereich oder äußerer Schicht erreicht.The switching shaft is made such that it consists of plastic in an outer region or has an outer plastic layer. Thus, the switching shaft on a core, which consists for example either of different and more stable material or with a constant cross-section and thus simpler. Shift shaft and / or core may be made of plastic, such as thermoplastic material. Particularly advantageously, the contour of the switching shaft or the outer region or the outer layer are applied to a core in a spraying process. As a shape of the core according to the invention has a flattened round profile, for example in D-shape. By deviating from a circular shape design an anti-rotation of the core and outer region or outer layer is achieved.

Erfindungsgemäß ist die Verstärkung im Bereich der Abflachung des Rundprofils des Kerns angeformt bzw. der Kern auf diese Art und Weise innerhalb der Schaltwelle angeordnet. Dabei ist es von Vorteil, wenn die Verstärkung nicht über den Querschnitt des Rundprofils ragt, welcher ohne Abflachung dem stetigen Verlauf des Querschnitts entsprechen würde. Anders gesagt, sollten also Form und Abragen der Verstärkung mit der Abflachung des Kerns abgestimmt werden.According to the invention, the reinforcement is formed in the region of the flattening of the round profile of the core or the core is arranged in this manner within the switching shaft. It is advantageous if the reinforcement does not protrude over the cross section of the round profile, which would correspond without flattening the steady course of the cross section. In other words, the shape and protrusion of the reinforcement should be tuned with the flattening of the core.

Für einen möglichst verzugfreien Spritzvorgang einer vorgenannten Schaltwelle aus Kunststoff ist es von Vorteil, wenn im wesentlichen die Dicke einer äußeren Schicht der Schaltwelle, welche um einen Kern herum gespritzt ist, gleich bleibt. Lediglich im Bereich der Abflachung des Kerns kann hiervon abgewichen werden. Schließlich ist hier vorteilhaft die Verstärkung angespritzt. Dabei sollte des weiteren in diesem Spritzvorgang auch die Kontur der Nocken oder Nockenscheiben an die Schaltwelle angebracht werden.For a distortion-free as possible injection molding an aforementioned switching shaft made of plastic, it is advantageous if essentially the Thickness of an outer layer of the switching shaft, which is injected around a core, remains the same. Only in the area of the flattening of the core can this deviate. Finally, the reinforcement is advantageously injection-molded here. In addition, the contour of the cams or cams should be attached to the shift shaft in this injection process.

Es ist von Vorteil, wenn die Schichtdicke einer äußeren Schicht gering ist gegenüber dem Durchmesser des Kerns. Dadurch wird eine mögliche Verzuggefahr der gesamten Schaltwelle nach dem Umspritzen des Kerns infolge von Erkalten verringert.It is advantageous if the layer thickness of an outer layer is small compared to the diameter of the core. Thereby, a possible risk of distortion of the entire shift shaft is reduced after the encapsulation of the core due to cooling.

Ein weiterer Aspekt für die Gestaltung der Schaltwelle bzw. die Anordnung der Verstärkung ist der, dass mit der eine Massenkonzentration darstellenden Verstärkungsrippe andere Massenkonzentrationen ausgeglichen werden können, welche ansonsten beim Spritzen der Schaltwelle ein Verziehen bewirken können. Ein derartiges Verziehen kann beispielsweise dadurch hervorgerufen werden, dass die Nocken oder Nockenscheiben üblicherweise starr in eine Richtung oder in einen Bereich hinein ausgerichtet sind. Es lässt sich eine Massenschwerpunktslinie der Nocken oder Nockenscheiben bestimmen. Bezüglich der Drehachse gesehen gegenüber von dieser Massenschwerpunktslinie sollte die Verstärkung verlaufen, um ihrerseits durch ihre eigene Masse beim Abkühlen der Schaltwelle nach dem Spritzen ein Verziehen zu vermeiden oder zumindest zu verringern. Auf diese Art und Weise können lange Schaltwellen ausgebildet werden, welche durch die rippenförmige Verstärkung bei bestimmten Ausbildungen der Erfindung sowohl einen Verzug bzw. Durchbiegen während des Betriebs aufgrund von Druckkräften als auch nach einem Spritzvorgang zur Herstellung besser widerstehen.Another aspect of the design of the shift shaft or the arrangement of the gain is that with the mass concentration representing a reinforcing rib other mass concentrations can be compensated, which can otherwise cause distortion during spraying of the shift shaft. Such warping may be caused, for example, by the cams or cams typically being rigidly oriented in one direction or in one area. It is possible to determine a center of mass line of the cams or cams. With respect to the axis of rotation, as seen from this center of mass line, the reinforcement should extend to prevent or at least reduce warping by its own mass upon cooling of the stem after injection. In this way, long control shafts can be formed which better resist both warping during operation due to compressive forces and after an injection molding operation due to the rib-shaped reinforcement in certain embodiments of the invention.

Diese und weitere Merkmale von bevorzugten Weiterbildungen der Erfindung gehen außer aus den Ansprüchen auch aus der Beschreibung und den Zeichnungen hervor, wobei die einzelnen Merkmale jeweils für sich allein oder zu mehreren in Form von Unterkombinationen bei einer Ausführungsform der Erfindung und auf anderen Gebieten verwirklicht sein und vorteilhafte sowie für sich schutzfähige Ausführungen darstellen können, für die hier Schutz beansprucht wird.These and other features of preferred embodiments of the invention will become apparent from the claims and from the description and drawings, wherein the individual features are realized individually or in each case in the form of sub-combinations in an embodiment of the invention and in other fields and can represent advantageous and protectable versions for which protection is claimed here.

Kurzbeschreibung der ZeichnungenBrief description of the drawings

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird im folgenden näher erläutert. In den Zeichnungen zeigen in schematischer Form:

Fig. 1
eine Seitenansicht einer möglichen Schaltwelle mit Verstärkungsrippe und einer Vielzahl von Nockenscheiben,
Fig. 2
einen Querschnitt durch die Schaltwelle an der Stelle einer im wesentlichen umlaufenden Nockenscheibe und
Fig. 3
einen weiteren Querschnitt durch die Schaltwelle an einer Stelle, an der sie lediglich eine abstehende Nocke aufweist.
An embodiment of the invention is illustrated in the drawings and will be explained in more detail below. In the drawings show in schematic form:
Fig. 1
a side view of a possible switching shaft with reinforcing rib and a plurality of cams,
Fig. 2
a cross section through the switching shaft at the location of a substantially rotating cam and
Fig. 3
a further cross section through the shift shaft at a location where it has only one protruding cam.

Detaillierte Beschreibung des AusführungsbeispielsDetailed description of the embodiment

In Fig. 1 ist eine Schaltwelle 11 in Seitenansicht dargestellt. In den Fig. 2 und 3 sind Schnittzeichnungen an verschiedenen Stellen mit unterschiedlich ausgebildeten Nockenscheiben dargestellt. Es ist dabei zu erkennen, wie die lange Schaltwelle 11 von einem Grundprofil 13 gebildet wird. An dem Grundprofil 13 sind verschiedenartige Nockenscheiben 15 angeformt. Die Nockenscheiben 15 weisen im dargestellten Ausführungsbeispiel grundsätzlich einen maximalen Radius auf bzw. sind aus einer Kreisscheibe mit diesem maximalen Radius herausgeformt. Bei der Nockenscheibe 15 nach Fig. 2 ist ein Einschnitt 16 aus der Nockenscheibe 15 herausgenommen. Bei Fig. 3 besteht die Nockenscheibe 15 im wesentlichen aus einer Scheibe mit sehr geringem Radius über das Grundprofil 13 hinaus. An dieser Scheibe ist ein Vorsprung 17 angeformt.In Fig. 1, a shift shaft 11 is shown in side view. In FIGS. 2 and 3, sectional drawings are shown at different locations with differently shaped cams. It can be seen how the long shift shaft 11 is formed by a base profile 13. At the base profile 13 different types of cams 15 are formed. The cams 15 have in the illustrated embodiment, in principle, a maximum radius or are formed out of a circular disc with this maximum radius. In the cam 15 of FIG. 2, an incision 16 is taken out of the cam 15. In Fig. 3, the cam plate 15 consists essentially of a disc with a very small radius over the base section 13 also. At this disc, a projection 17 is formed.

Gegen die Nockenscheiben 15 drücken von unten die Schaltkontakte 19. Deren Druckkraft bzw. Schaltkraft wird durch die nach oben weisenden Pfeile an allen Nockenscheiben 15 dargestellt. Die Schaltkontakte 19 können zum einen reine Schaltkontakte sein, welche öffnen oder schließen. Des weiteren können als Schaltkontakte auch abstandsvariable Schalter vorgesehen sein, beispielsweise für thermische Ausdehnungsschalter mit Voreinstellung eines Schaltweges. In diesem Fall weisen die Nockenscheiben 15 nicht nur abgestufte Radien auf, sondern einen gleichmäßig zu- oder abnehmenden Radius. Damit können in Abhängigkeit von einem Drehwinkel die Schaltkontakte 19 langsam und kontinuierlich bewegt werden.Press against the cams 15 from below the switch contacts 19. Their compressive force or switching force is represented by the upward-pointing arrows on all cams 15. The switching contacts 19 may be a pure switching contacts, which open or close. Furthermore, as a switch contacts and variable-distance switch may be provided, for example, for thermal expansion switch with default setting of a switching path. In this case, the cams 15 not only graded radii, but a uniformly increasing or decreasing radius. Thus, depending on a rotation angle, the switching contacts 19 can be moved slowly and continuously.

In den Querschnittsdarstellungen aus Fig. 2 und Fig. 3 ist zu erkennen, wie die Schaltwelle 11 im einzelnen aufgebaut ist. Ein Kern 21 mit einem abgeflachten D-Profil ist mit dem Grundprofil 13 umgeben bzw. umspritzt. Das Grundprofil 13 weist eine Abflachung 23 auf, welche in den Zeichnungen nach oben gerichtet ist. Somit ist zu erkennen, wie das Grundprofil 13 mit gleichmäßiger Wandstärke den Kern 21 umgibt.In the cross-sectional views of Fig. 2 and Fig. 3 it can be seen how the shift shaft 11 is constructed in detail. A core 21 with a flattened D-profile is surrounded or overmolded with the base profile 13. The base profile 13 has a flattening 23, which is directed upward in the drawings. Thus it can be seen how the basic profile 13 with uniform wall thickness surrounds the core 21.

In der Mitte der Abflachung 23 ist nach oben weisend eine Verstärkungsrippe 25 angeformt. Diese weist einen in etwa rechteckigen Querschnitt auf. Aus Fig. 3 ist zu erkennen, dass sie nicht über den Radius des sonstigen Grundprofils 13 übersteht. Aus Fig. 1 ist zu erkennen, wie sie sich über den gesamten mittleren Bereich der Länge der Schaltwelle 11 und somit ca. 70% bis 80% der Länge der Schaltwelle erstreckt.In the middle of the flattening 23, a reinforcing rib 25 is formed upwardly facing. This has an approximately rectangular cross-section. From Fig. 3 it can be seen that it does not protrude beyond the radius of the other basic profile 13. From Fig. 1 it can be seen how it extends over the entire central region of the length of the switching shaft 11 and thus about 70% to 80% of the length of the switching shaft.

Somit ist zu erkennen, dass es grundsätzlich möglich ist, an einer beliebigen Stelle des Grundprofils 13 der Schaltwelle 11 eine solche Verstärkungsrippe 25 anzuordnen. Besonders vorteilhaft ist die Verwendung eines abgeflachten Rundprofils mit D-Form von Kern und/oder Grundprofil. Dies ermöglicht es, im Bereich der Abflachung die Verstärkungsrippe vorzusehen derart, dass sie nicht über den sonstigen Radius des Grundprofils übersteht. Anstelle einer einzigen Verstärkungsrippe ist es auch möglich, im Bereich der Abflachung zwei oder mehr Verstärkungsrippen anzuordnen.Thus, it can be seen that it is basically possible to arrange such a reinforcing rib 25 at any point of the base profile 13 of the switching shaft 11. Particularly advantageous is the use of a flattened round profile with D-shape of core and / or base profile. This makes it possible to provide the reinforcing rib in the region of the flattening in such a way that it does not project beyond the other radius of the base profile. Instead of a single reinforcing rib, it is also possible to arrange two or more reinforcing ribs in the region of the flattening.

Des weiteren ist aus den Figuren zu erkennen, wie die Verstärkungsrippe 25 in der Stellung gemäß den Figuren genau gegenüberliegend der Schaltkontakte 19 und der durch sie bewirkten Kräfte angeordnet ist. Somit kann sie ein Durchbiegen der Schaltwelle 11 effektiv verhindern. Da die Schaltwelle 11 üblicherweise an ihren beiden Enden gelagert ist, ist diese Gefahr des Durchbiegens in der Mitte am größten. Insofern ist die Verstärkungsrippe 25 auf alle Fälle im Mittelbereich besonders vorteilhaft.Furthermore, it can be seen from the figures how the reinforcing rib 25 in the position according to the figures is arranged exactly opposite the switching contacts 19 and the forces caused by them. Thus, it can effectively prevent bending of the shift shaft 11. Since the shift shaft 11 is usually mounted at both ends, this risk of bending in the middle is greatest. In this respect, the reinforcing rib 25 is in any case particularly advantageous in the middle region.

Des weiteren ist aus den Fig. 2 und 3 zu erkennen, wie der Gewichtsschwerpunkt der Nockenscheiben 15 mit den Einschnitten 16 oder dem Vorsprung 17 aufgrund ihrer Form zwar nicht in jedem Fall leicht genau bestimmt werden kann. Allerdings liegt er sicherlich unterhalb des Mittelpunkts der Schaltwelle 11, welche die Drehachse bildet. Insofern kann beim Herstellungsprozess durch die Verstärkungsrippe 25 erreicht werden, dass hier im Vergleich zu einem kreisringförmigen Grundprofil 13 ein gewisser Masseschwerpunkt oberhalb des Mittelpunkts gegeben ist. Dadurch lässt sich der Masseschwerpunkt der Nockenscheiben 15 unterhalb des Drehpunkts insofern ausgleichen, als dass ein Verziehen der Schaltwelle beim Abkühlen nach dem Spritzvorgang durch einseitige Massen- bzw. Materialanlagerungen vermieden wird.Furthermore, it can be seen from FIGS. 2 and 3, as the center of gravity of the cams 15 with the cuts 16 or the projection 17, although not in any case can be determined easily due to their shape. However, it is certainly below the center of the switching shaft 11, which forms the axis of rotation. In this respect, it can be achieved in the manufacturing process by the reinforcing rib 25 that, in comparison to an annular base profile 13, a certain center of mass is given above the center here. As a result, the center of gravity of the cams 15 can be compensated below the pivot point insofar as that warping of the shift shaft during cooling after the injection process by unilateral mass or material deposits is avoided.

Insgesamt ist bei der Gestaltung der Schaltwelle 11 sowie des Drehschalters bzw. der Schaltkontakte 19 vorteilhaft darauf zu achten, dass eine möglichst einheitliche Ausrichtung der hauptsächlich wirkenden Schaltkräfte gegeben ist. Diese ermöglicht eine an einer Stelle vorhandene Verstärkungsrippe.Overall, it is advantageous in the design of the switching shaft 11 and the rotary switch or the switch contacts 19 to ensure that the most uniform possible alignment of the main operating switching forces is given. This allows an existing in one place reinforcing rib.

Um Ausbildungen mit mehreren Verstärkungsrippen vorzusehen, könnten entweder an dem Kern 21 weitere Abflachungen vorhanden sein, welche wiederum das Vorsehen weiterer Abflachungen entsprechend der Abflachung 23 am Grundprofil 13 ermöglicht. Hier kann dann im Bereich jeder Abflachung eine abstehende Verstärkungsrippe vorgesehen sein. Des weiteren ist es auch möglich, Verstärkungsrippen unter dem oben angesprochenen Gesichtspunkt des Massenausgleichs für einige wenige oder einzelne Nockenscheiben 15 vorzusehen. In diesem Fall sollten sie gegenüber deren Masseschwerpunkt angeordnet sein. Hierbei ist dann jedoch darauf zu achten, dass der Masseschwerpunkt nicht zu weit von der gegenüberliegenden Seite der durchgehenden Verstärkungsrippe 25 abweicht.To provide training with multiple reinforcing ribs, further flattening could be present either on the core 21, which in turn allows the provision of further flattenings corresponding to the flattening 23 on the base profile 13. Here can then be provided in the region of each flattening a projecting reinforcing rib. Furthermore, it is also possible to provide reinforcing ribs for the few or individual cams 15 under the mass balance approach discussed above. In this case they should be placed opposite to their center of mass. In this case, however, it must be ensured that the center of mass does not deviate too far from the opposite side of the continuous reinforcing rib 25.

Anstelle der geradlinig durchgehenden Verstärkungsrippe 25 gemäß den Figuren ist es auch möglich, die Verstärkungsrippe im Bereich zwischen einzelnen Nockenscheiben 15 in Umfangsrichtung um einen geringen Winkel zu versetzen. Allerdings sollte diese Versetzung nicht zu groß sein, um die Festigkeitseigenschaften der Verstärkungsrippe zur Aufnahme von Zugkräften nicht zu sehr zu beeinträchtigen.Instead of the straight continuous reinforcing rib 25 according to the figures, it is also possible to offset the reinforcing rib in the region between individual cams 15 in the circumferential direction by a small angle. However, this offset should not be too large so as not to affect the strength properties of the reinforcing rib to absorb tensile forces too much.

Somit kann bei einem Ausführungsbeispiel der Erfindung eine Schaltwelle für einen Drehschalter geschaffen werden, die angeformte Nocken oder Nockenscheiben aufweist. An der Außenseite der Schaltwelle ist eine Verstärkungsrippe vorgesehen, welche in Axialrichtung bis kurz vor die Enden der Schaltwelle verläuft. Diese Verstärkungsrippe kann Zugspannungen aufnehmen, welche von Druckkräften von Schaltkontakten vor allem im Mittelbereich der Schaltwelle hervorgerufen werden. So kann ein Durchbiegen der Schaltwelle vermieden werden.Thus, in one embodiment of the invention, a shift shaft for a rotary switch can be provided which has molded cams or cams. On the outside of the switching shaft, a reinforcing rib is provided, which extends in the axial direction to just before the ends of the switching shaft. This reinforcing rib can absorb tensile stresses, which are caused by pressure forces of switching contacts, especially in the central region of the switching shaft. Thus, a deflection of the shift shaft can be avoided.

Claims (10)

  1. Switching shaft for rotary switch, the switching shaft (11) having shaped on cams (17) or cam disks (15) and on the outside of the switching shaft (11) in the axial direction is shaped at least one reinforcement in the form of a rib (25) for absorbing tensile stress against the bending of switching shaft (11), which has at least one outer area or outer layer (13) of plastic and a core (21) injection moulded round with plastic for producing the switching shaft (11), characterized in that the core and optionally also the switching shaft (11) has a flattened round profile, the reinforcement (25) being shaped in the vicinity of the flattening (23) of the round profile of core (21).
  2. Switching shaft according to claim 1, further characterized in that the reinforcement (25) passes over a wide, central area of switching shaft (11) and preferably up to shortly before the particular end of the switching shaft and preferably in the area with a reinforcement and/or in the area without a reinforcement there is a substantially constant cross-section.
  3. Switching shaft according to claim 2, characterized in that the reinforcement (25) is continuous without interruptions and preferably with a constant thickness.
  4. Switching shaft according to one of the preceding claims, characterized in that the reinforcement (25) projects from the switching shaft (11) with approximately 10 to 30% of the total diameter of said switching shaft.
  5. Switching shaft according to one of the preceding claims, characterized in that the reinforcement (25) is directed in the force direction which is exerted on the switching shaft (11) in a specific rotation position in which the highest compressive forces are exerted on cams (17) or cam disks (15) by switching contacts (19) or the like, which are operated or moved by the cams or cam disks.
  6. Switching shaft according to claim 1, characterized in that it is made from thermoplastic material, preferably also a core (21) of switching shaft (11), which is injection moulded.
  7. Switching shaft according to claim 1, characterized in that the switching shaft round profile is a D-profile.
  8. Switching shaft according to claim 1 or 7, characterized in that the reinforcement does not project beyond the round profile cross-section and which, without flattening, corresponds to the continuous course of the cross-section.
  9. Switching shaft according to claim 7 or 8, characterized in that, apart from the flattening (23), the thickness of an outer coating (13) injection moulded around a core (21) of switching shaft (11) is constant and is in particular small compared with the core diameter.
  10. Switching shaft according to one of the preceding claims, characterized in that, considered circumferentially, the reinforcement (25) is shaped in an area of switching shaft (11) facing that area in which there is a mass concentration of cams (17) or cam disks (15) and this is in particular the centre of gravity of the cams or cam disks relative to the cross-section.
EP04713891A 2003-02-24 2004-02-24 Switching shaft for a rotary switch Expired - Lifetime EP1597741B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10308449A DE10308449A1 (en) 2003-02-24 2003-02-24 Switching shaft for rotary switches
DE10308449 2003-02-24
PCT/EP2004/001808 WO2004075225A1 (en) 2003-02-24 2004-02-24 Switching shaft for a rotary switch

Publications (2)

Publication Number Publication Date
EP1597741A1 EP1597741A1 (en) 2005-11-23
EP1597741B1 true EP1597741B1 (en) 2007-05-16

Family

ID=32863936

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04713891A Expired - Lifetime EP1597741B1 (en) 2003-02-24 2004-02-24 Switching shaft for a rotary switch

Country Status (7)

Country Link
EP (1) EP1597741B1 (en)
CN (1) CN100435256C (en)
AT (1) ATE362643T1 (en)
DE (2) DE10308449A1 (en)
ES (1) ES2286609T3 (en)
PL (1) PL205107B1 (en)
WO (1) WO2004075225A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101046520B1 (en) 2007-09-07 2011-07-04 어플라이드 머티어리얼스, 인코포레이티드 Source gas flow path control in pecvd system to control a by-product film deposition on inside chamber
DE102010045215A1 (en) * 2010-09-13 2012-03-15 Audi Ag Switch shaft and method for producing a switching shaft
CN104681342B (en) * 2015-01-22 2017-02-01 温州市华一机电有限公司 Rotary shaft assembly for reversible switch and manufacturing method thereof
CN114446685B (en) * 2020-10-30 2024-03-01 北京铁路信号有限公司 Switch control device and railway signal recorder

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2604783C3 (en) * 1976-02-07 1979-10-04 E.G.O. Elektro-Geraete Blanc U. Fischer, 7519 Oberderdingen Electric cam switch
CN2348479Y (en) * 1998-01-22 1999-11-10 张茂良 Multiplex switch
DE10044046A1 (en) * 2000-08-30 2002-03-14 Siemens Ag Switching shaft for multiple-pole power switch, has molded radial piece and integral lever part
DE10112240A1 (en) * 2001-03-05 2003-01-30 Ego Elektro Geraetebau Gmbh Control roller for an electromechanical switching device

Also Published As

Publication number Publication date
ATE362643T1 (en) 2007-06-15
EP1597741A1 (en) 2005-11-23
CN1754239A (en) 2006-03-29
CN100435256C (en) 2008-11-19
PL376928A1 (en) 2006-01-09
ES2286609T3 (en) 2007-12-01
WO2004075225A1 (en) 2004-09-02
PL205107B1 (en) 2010-03-31
DE10308449A1 (en) 2004-09-16
DE502004003838D1 (en) 2007-06-28

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