WO2020239928A1 - Connecteur à enfichage avec système de verrouillage - Google Patents

Connecteur à enfichage avec système de verrouillage Download PDF

Info

Publication number
WO2020239928A1
WO2020239928A1 PCT/EP2020/064875 EP2020064875W WO2020239928A1 WO 2020239928 A1 WO2020239928 A1 WO 2020239928A1 EP 2020064875 W EP2020064875 W EP 2020064875W WO 2020239928 A1 WO2020239928 A1 WO 2020239928A1
Authority
WO
WIPO (PCT)
Prior art keywords
connector
locking
spring pin
plug
spring
Prior art date
Application number
PCT/EP2020/064875
Other languages
German (de)
English (en)
Inventor
Michael Bertsch
Original Assignee
Amphenol Tuchel Industrial 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 Amphenol Tuchel Industrial GmbH filed Critical Amphenol Tuchel Industrial GmbH
Publication of WO2020239928A1 publication Critical patent/WO2020239928A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/62—Means for facilitating engagement or disengagement of coupling parts or for holding them in engagement
    • H01R13/625—Casing or ring with bayonet engagement
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/62—Means for facilitating engagement or disengagement of coupling parts or for holding them in engagement
    • H01R13/639—Additional means for holding or locking coupling parts together, after engagement, e.g. separate keylock, retainer strap
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/62—Means for facilitating engagement or disengagement of coupling parts or for holding them in engagement
    • H01R13/627—Snap or like fastening
    • H01R13/6278—Snap or like fastening comprising a pin snapping into a recess

Definitions

  • the invention relates to a locking system for plug connectors for connecting and locking a plug with its plug partner, having a primary lock, formed at least from a bayonet ring with a rotational degree of freedom, fixed on one
  • Connector housing and designed for functional interaction with a
  • the invention also relates to a plug connection with a locking system.
  • Such high-voltage connectors are often implemented as circular connectors with one or more plug contact pins and, in addition to reliable, detachable and permanent contact, must in particular also protect against unwanted or through
  • bayonet or screw locks are often used as primary locks in the prior art.
  • These securing means are usually firmly attached to the respective plug connections and are supplemented by secondary locks to protect against unintentional separation of the connection.
  • securing means are usually used as spring-like arrangements which are in engagement with corresponding openings or latches and thereby cause two parts of a circular connector to be locked.
  • Rotary lock which, like a bayonet lock, is attached to the plug connections in such a way that the connector pair is fixed to a locking thread by means of a locking screw.
  • Locks of this type are problematic, in particular, when the aim is to prevent the lock from being released unintentionally or improperly and / or from pulling the plug connector under voltage. In the latter case, arcs can ignite, especially in the high-voltage range, which are problematic in terms of safety and can endanger life.
  • connector locks in particular screw locks, can loosen over time as a result of these mechanical vibrations and the connector is no longer reliably connected to the mating connector.
  • a plug of this plug connection comprises an inner subassembly, an outer sleeve which is mounted displaceably with respect to the inner subassembly and at least partially encloses the inner subassembly and first locking means for locking the plug with an associated plug connector part when the plug is plugged onto the plug connector part, the locking being provided by a Displacement of the outer sleeve with respect to the inner assembly can be solved.
  • Such connectors consisting of a plug and a connector part, are known as push-pull connectors. This name is derived from the function of such connectors. These can be closed by simply plugging the connector onto the connector part in one direction of insertion (“push”).
  • the connector part can be a socket or a second plug. When plugging on or by plugging on, locking means of the plug and the
  • Connector part locked together so that the connector is not by a train z. B. can be solved on a cable connected to the connector.
  • the outer sleeve of the plug is pulled against the direction of insertion (“pull”).
  • Pull direction of insertion
  • the locking means are unlocked.
  • the plug is released from the connector part.
  • an additional operation must be performed to lock or unlock.
  • Such a process would be, for example, the raising or lowering of a locking hook serving as a locking means or an additional rotational movement of the outer sleeve, such as. B. common with so-called bayonet connectors.
  • the disadvantage is that the connector can be accidentally released due to the simple unlocking process by pulling on the outer sleeve.
  • Another disadvantage of the known connectors of this PushPull type is that anyone who has access to the connector can release such a connector without any further aids. Accidental, arbitrary or unauthorized loosening cannot be prevented with the well-known connectors of the convenient PushPull type.
  • Locking element is provided, which is slidably mounted and can be brought into at least one stable locking position in which the displacement of the outer sleeve with respect to the inner assembly is blocked, and at least one stable release position in which the displacement of the outer sleeve is released with respect to the inner assembly is.
  • Connector part and socket part consisting of coupling halves for connecting and disconnecting multi-core electrical high-voltage and / or low-voltage lines, each coupling half consisting of a substantially cylindrical receiving electrical contact elements
  • Housing exists, both of which can be coupled by means of a sleeve.
  • the coupling sleeve has a radially inwardly projecting nose for engagement in a locking groove which is formed on the housing end of one of the two coupling halves.
  • the locking groove consists of an in
  • Circumferential end portion in which an axially or obliquely
  • Lead-in section opens, with a torsion spring being arranged in the union sleeve, one end of which is in the union sleeve and the other end at the not with the
  • This three-part connector device is coupled or decoupled via a bayonet system.
  • the torsion spring has the effect of a closing spring, which in the
  • a connector coupling is presented, consisting of a first coupling half, which has at least one coupling housing and a contact carrier housed therein
  • Connecting element includes suitable area of the coupling housing.
  • the primary lock is optionally available as screw connections, for example by means of
  • Anti-rotation lock is formed in that the anti-rotation lock assigned to the threadless connecting element of the second coupling half or protection against unwanted rotation due to vibrations consists of at least one spring element fixed on the clutch housing of the second clutch half and a detent assigned to this on the inner circumference of the sleeve forming the connecting element, with a simple implementation results in that the spring element or elements fixed on the coupling housing of the second coupling half are formed by radially projecting leaf spring sections, which are assigned notch-shaped detents on the inner circumference of the sleeve forming the connecting element.
  • a secondary locking means is attached to one of the plug connectors in such a way that the primary locking means, preferably the locking ring, is held in its position by the secondary locking means in its intended locked state.
  • the locking ring can be unlocked from its locking position and released against the locking direction.
  • the secondary lock or the secondary locking means is as one between the
  • Connector and the connector socket arranged spring pin formed.
  • a so-called pogopin can be used as a spring pin.
  • the Pogopin is constructed in such a way that the spring pin pin can resiliently dip into the spring pin body and when the spring pin pin is released it can return to its original position against a spring force of a spring arranged in the spring pin body.
  • the spring pin is arranged on the connector socket in such a way that it can plunge into a recess on the locking ring of the connector after locking the locking ring by engaging the spring pin pin in a recess on the locking ring and thus securing the locking ring against loosening.
  • the spring pin engages the corresponding secondary locking recess and fixes the primary lock, preferably a locking ring, in its intended position.
  • the arrangement of the spring pin relative to the connector partners is always chosen so that the spring pin movement takes place axially to the connector in an also axially aligned recess.
  • the invention solves the problem by a locking system for connectors, in particular for high-voltage connectors (in DC applications) with integrated primary and
  • Both the actual locking and the locking safety device are released in two stages via a bayonet lock which is able to lock against unintentional release in the end position or a certain position.
  • the at least one gate of the bayonet-based locking solution offers an associated spring pin two latching positions, which are achieved by a meander-shaped gate or a Z-shaped extension.
  • the latching positions of the respectively assigned spring pins are added to the Z-shaped link profile by a ramp, ie a height profile provided within the link groove at the two latching positions in the form of a changing groove depth.
  • the ramp can be designed in different ways: in a "soft" curve, stepped with a high or low incline or gradient, as a partial radius, cage arch with radii of different amounts that merge into one another, etc.
  • the spring pin assigned to a respective link is embedded in a bore of a connector housing and has a radial degree of freedom of movement with respect to its central axis. It works functionally together with a spring element and optionally an associated sleeve that preferably envelops the spring element in areas.
  • the spring element and the optional sleeve are accommodated in a pocket of a bayonet ring encompassing the connector on the outside and lie against the outer face of the spring pin in a defined bayonet ring orientation.
  • the bayonet ring has a degree of freedom with respect to the connector housing that supports two end positions.
  • the bayonet ring is designed in such a way that it has two positions, which in this case can be reached by a rotary movement.
  • One of the end positions supports an unlocked state of the primary lock, the other end position supports the locked position.
  • the respectively assigned spring pin In the unlocked position (if the connector and mating connector can be separated) the respectively assigned spring pin can be moved through the setting, since the radial mobility of the spring pin follows the differences in the groove depth of the setting.
  • the assigned spring pin In the locking position of the bayonet ring, the assigned spring pin is fixed by the ring in the radial direction, so that the movement out of the locking position in the link groove is locked, with the result that the connector cannot be released.
  • the bayonet ring can optionally be locked in the desired end position by latching, fixing means or spring elements.
  • the time required by the kinematics of the movement ensures that the plug contacts are de-energized before the actual release and that arcing does not occur.
  • Connector housing with locking system for connectors in a closed position (“lock”) of the locking system ;
  • Fig. 3 shows the three-dimensional representation of the connector housing
  • FIG 4 shows the front view and perspective illustration of the bayonet socket.
  • Figure 1 forms the side and front view and the sectional view of the
  • Bayonet ring 110 is fixed with a rotational degree of freedom relative to connector plug 140 with respect to the common center axis on the outside of connector housing 140.
  • a locking ring V is rotatably mounted on the bayonet ring 110, the locking ring V being movable from a locking position into a release position.
  • the resilient pins bayonet pins
  • the resilient pins described in more detail below cannot spring radially outward, since they are blocked in this direction by the locking ring V in this degree of freedom.
  • Spring pins 120 are deflected radially outward against the spring force of a spring. In this position, the spring pins 120 can accordingly be resiliently moved back and forth in the radial direction.
  • the three spring pins 120 are movably received along their axial axis in a respective bearing opening or bore 145 of the connector housing 140 and functionally work together with a spring element 121 and an optionally assigned sleeve 122, which preferably envelops the spring element 121 in areas.
  • the spring element 121 and sleeve 122 are in one Pocket 111 of the locking ring V surrounding the connector 140 on the outside. With a relative orientation of the bayonet ring, which corresponds to the open position, the spring pins 120 lie against the springs. In this bayonet ring orientation, the spring pin 120 is radial to the connector housing 140 and against the spring force of the
  • Spring element 121 movable, so that the spring pin 120 can compensate for unequal depth levels of the link, bayonet groove 131 kinematically.
  • the locking ring V in the unlocked position allows the spring pin 120 to pass through the link 131 with the spring pin 120, regardless of the height level, due to the degree of freedom of the spring pin 120.
  • Connector housing 140 or shown distributed evenly on the circumference. This design, which is often advantageous for static reasons, can be depending on the area of application or
  • Environmental conditions can also be constructed differently, for example asymmetrically or with one, two or more than three functionally interacting spring pin arrangements.
  • Figure 2 includes the side and front view as well as the sectional view of the
  • End position positions support the locking position (“lock”) in that the spring pin 120 has no degree of freedom along its axial axis and, as a result, the spring pin 120 does not allow any actuation travel within the gate 131 into an area with a smaller groove depth.
  • This state is achieved in that the locking ring V with its partial circular rotational movement into the locking position is the one received in the pocket 111
  • Spring element 121 and sleeve 122 moved out of the position aligned with spring pin 120 and moved into a position aligned with recess 143.
  • the spring force of the spring element 121 moves the sleeve 122 at least in sections into the recess 143 so that the sleeve 122 comes to rest with its end faces in the bottom of the blind hole.
  • the end position is in the locking division by the stop of a sleeve section in the recess 143
  • Bayonet ring 110 realized on the circumference. Opposite the stop side, the recess 143 can have a ramp, bevel 144, which supports the axial movement of the sleeve in the locking ring pocket 111. As an alternative or in addition, this or both end stops for limiting the movement of the respective end positions can be implemented by other suitable stops.
  • a dome 112 interacting geometrically with the inner region of the spring element 121 can be formed with the aim of engaging a section of the spring element 121 on the inside so that this is guided and / or fixed in the pocket 111 by a slight press fit.
  • FIG. 3 shows the three-dimensional representation of the connector housing 140 with
  • the bayonet ring 110 of the locking system 100 is arranged at the end of the connector housing 140, so that the functional interaction with the bayonet socket 130 (not shown) which can be axially inserted at the end is supported.
  • the connector contact is axially centered with a preferably round plug contact.
  • the contact is made by means of a
  • Lamellar contact socket 141 is provided.
  • FIG. 4 comprises the front view and perspective illustration of the bayonet socket 130 of the mating connector.
  • This example shows a flange solution; other plug contact housing shapes are also encompassed by the invention.
  • the Z-shaped coulisse, bayonet groove 131 has an inlet or outlet that extends in the axial extension (plug-in direction) of the bayonet socket 130.
  • Control link 131 can be moved in and out.
  • the plug-in and transfer of the plug-in connector into the mating connector takes place here by an axial plug-in movement.
  • the spring pins 120 dip into the longer axial groove areas 131 of the control link 131.
  • the spring pin 120 is spring force operated in the lowest level in the height range over the step S with the, reference numeral the 133rd Because of the S stage, the connector cannot be separated from the mating connector by a simple axial separating movement. It is therefore possible to bring the plug with the mating plug into a locked position without actuating the bayonet.
  • Intermediate latching position 134 is actuated via the second stage S2, which prevents actuation in the opposite direction. This ensures that the link 131 can only be passed through in one direction with the spring pins 120.
  • control link 131 is in the opposite direction
  • the plug-in direction is limited by a stop X at the intermediate latching position 134 and experiences a change of direction of about 90 ° with respect to the axial plug-in direction.
  • the spring pins 120 are actuated radially outward. In this position of the bayonet ring 110, the connector can be pulled axially from the mating connector. The respective spring pin 120 slides in the control link in the link section E.
  • the groove depth areas of the gate 131 that differ from one another are connected to one another via and with a ramp 132 in each case and are designed in such a way that the spring pin 120 engaging in the groove 131 is provided with a contact surface on the face.
  • the spring pin travel direction of the respective ramp 132 upstream or downstream groove area represents a latching position 133, 134 for the spring pin 120, from which the spring pin 120 can only move out if its axial degree of freedom is permitted by the open position of the bayonet ring 110.
  • a latching position is preferably provided as an intermediate latching position 134, so that a quick separation of the plug connection is prevented. This "compulsory stop" at

Landscapes

  • Details Of Connecting Devices For Male And Female Coupling (AREA)

Abstract

L'invention concerne un système de verrouillage pour connecteurs à enfichage destiné à connecter et à verrouiller une fiche à son partenaire d'enfichage, comprenant un verrouillage primaire, constitué au moins d'une bague à baïonnette ayant un degré de liberté de rotation, fixée à un boîtier de connecteur à enfichage et conçue pour une coopération fonctionnelle avec une coulisse de commande, laquelle est disposée dans une rainure sur une fiche homologue du connecteur à enfichage. Le verrouillage primaire est formé par au moins une goupille élastique qui vient en prise dans la coulisse de commande associée à la goupille élastique et la goupille élastique réalise intégralement un verrouillage secondaire en fonction de la position de la bague à baïonnette. L'invention concerne également une connexion par enfichage comprenant un système de verrouillage.
PCT/EP2020/064875 2019-05-28 2020-05-28 Connecteur à enfichage avec système de verrouillage WO2020239928A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019114257.1A DE102019114257B4 (de) 2019-05-28 2019-05-28 Steckverbinder mit Verriegelungssystem
DE102019114257.1 2019-05-28

Publications (1)

Publication Number Publication Date
WO2020239928A1 true WO2020239928A1 (fr) 2020-12-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2020/064875 WO2020239928A1 (fr) 2019-05-28 2020-05-28 Connecteur à enfichage avec système de verrouillage

Country Status (2)

Country Link
DE (1) DE102019114257B4 (fr)
WO (1) WO2020239928A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114001220A (zh) * 2021-11-05 2022-02-01 重庆溯联汽车零部件有限公司 一种用于新能源管路连接装置的校验器
CN114601501A (zh) * 2021-09-28 2022-06-10 深圳北芯生命科技股份有限公司 血管内超声回撤系统的插拔装置及回撤单元
CN115306664A (zh) * 2021-12-28 2022-11-08 兰州理工大学 一种具有防配油轴变形功能的径向柱塞泵及其方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021111619A1 (de) 2021-05-05 2022-11-10 Bayerische Motoren Werke Aktiengesellschaft Elektrische Steckverbindung, insbesondere zum Laden von elektrisch be-triebenen Fahrzeugen, und Ladesystem

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5993239A (en) * 1998-07-08 1999-11-30 Osram Sylvania Inc. Positive latch connector
DE202005010113U1 (de) 2005-06-06 2005-09-08 Intercontec Produkt Gmbh Steckverbinderkupplung
DE202008013794U1 (de) 2008-11-24 2009-04-02 Intercontec Pfeiffer Steckverbindungen Gmbh Steckverbindervorrichtung
US7726999B2 (en) * 2007-12-21 2010-06-01 Van-System S.R.L. Electrical connector set
DE202010017274U1 (de) 2010-04-28 2011-09-23 Amphenol-Tuchel Electronics Gmbh Elektrische Steckverbindung, insbesondere Rundsteckverbindung
DE102013112103A1 (de) 2013-11-04 2015-05-21 Phoenix Contact Gmbh & Co. Kg Push-Pull-Steckverbinder mit zusätzlichem Verriegelungselement
CN105322363A (zh) * 2015-10-16 2016-02-10 宁波天鹭莱电子技术有限公司 一种圆形电连接器

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4530559A (en) * 1983-10-31 1985-07-23 Automation Industries, Inc. Locking means for a plug and receptacle connector
US6053756A (en) * 1998-05-04 2000-04-25 Applied Materials, Inc. Interlock safety device
CN108232727A (zh) * 2018-03-27 2018-06-29 成都名典匠心工业产品设计有限公司 一种新能源汽车充电用自动对接接头

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5993239A (en) * 1998-07-08 1999-11-30 Osram Sylvania Inc. Positive latch connector
DE202005010113U1 (de) 2005-06-06 2005-09-08 Intercontec Produkt Gmbh Steckverbinderkupplung
US7726999B2 (en) * 2007-12-21 2010-06-01 Van-System S.R.L. Electrical connector set
DE202008013794U1 (de) 2008-11-24 2009-04-02 Intercontec Pfeiffer Steckverbindungen Gmbh Steckverbindervorrichtung
DE202010017274U1 (de) 2010-04-28 2011-09-23 Amphenol-Tuchel Electronics Gmbh Elektrische Steckverbindung, insbesondere Rundsteckverbindung
DE102013112103A1 (de) 2013-11-04 2015-05-21 Phoenix Contact Gmbh & Co. Kg Push-Pull-Steckverbinder mit zusätzlichem Verriegelungselement
CN105322363A (zh) * 2015-10-16 2016-02-10 宁波天鹭莱电子技术有限公司 一种圆形电连接器

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114601501A (zh) * 2021-09-28 2022-06-10 深圳北芯生命科技股份有限公司 血管内超声回撤系统的插拔装置及回撤单元
CN114001220A (zh) * 2021-11-05 2022-02-01 重庆溯联汽车零部件有限公司 一种用于新能源管路连接装置的校验器
CN114001220B (zh) * 2021-11-05 2023-07-25 重庆溯联汽车零部件有限公司 一种用于新能源管路连接装置的校验器
CN115306664A (zh) * 2021-12-28 2022-11-08 兰州理工大学 一种具有防配油轴变形功能的径向柱塞泵及其方法

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DE102019114257B4 (de) 2021-01-21

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