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
  • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
  • H01R4/10—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation
  • H01R4/18—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping
  • H01R4/20—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping using a crimping sleeve
  • H01R4/203—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping using a crimping sleeve having an uneven wire-receiving surface to improve the contact

Definitions

• the invention relates to a compression sleeve with the features of the preamble of claim 1.
• a compression cable lug which has a compression sleeve which is provided with a thread on its inner surface.
• the thread is formed without cutting by forming a helical, groove-like depression.
• the thread should ensure a good mechanical and electrical connection between the compression sleeve and the strand to be received.
• this press sleeve like the known press sleeves with a smooth inner surface, does not always lead to completely satisfactory press connections.
• the invention is therefore based on the object of improving a compression sleeve of the type mentioned. This object is achieved according to the invention by a compression sleeve having the features of claim 1.
• the groove-like depressions in the longitudinal direction of the sleeve define weak points in the sleeve wall. At these defined weak points, the sleeve wall deforms in such a way that longitudinal cuts are formed. Furthermore, the weak points reduce the restoring force of the press sleeve that opposes the pressing. As a result, a lower pressing force is sufficient to achieve a press connection of the same quality. In addition, the better compressibility enables a shorter length of the compression sleeve and thus possibly a smaller, in particular shorter sleeve with a correspondingly lower casting resin requirement. A shorter press sleeve also requires fewer press points.
• groove-like depressions are at least partially still present after the pressing and open into at least one of the two end faces, these groove-like depressions form pressure relief channels for the press grease usually used during pressing. A heating and expansion of the press grease then does not lead to a deterioration in the electrical contact between the press sleeve and the conductor and the build-up of mechanical stresses.
• the groove-like recesses are designed as continuous longitudinal grooves and are evenly distributed in the circumferential direction. The latter is also advantageous for the quality of the connection. Groove-like depressions, the flanks of which are each one, are particularly advantageous
• Form edge with the inner surface in particular groove-like depressions that have a rectangular or trapezoidal cross-sectional profile.
• the compression sleeve has cutting edges on its inner circumferential surface which extend with a component in the circumferential direction and which are advantageously parts of a thread interrupted by the groove-like depressions. The destruction of any oxide skin of the conductor by the cutting improves the electrical contact between the compression sleeve and the conductor.
• Fig. 3 shows a longitudinal section through the embodiment
• the exemplary embodiment is a one-piece, approximately hollow-cylindrical press connector which has two identical press sleeves 1 according to the invention axially next to one another.
• Each compression sleeve 1 has cutting edges 3 on its inner circumferential surface, which run essentially in the circumferential direction and were formed as parts of a thread 2 in the manufacture of the compression sleeve 1, preferably by non-cutting shaping.
• the inside diameter of the press sleeve 1 is defined by the inwardly pointing edges of the cutting edges 3.
• the wall thickness of the press sleeve 1 is defined by the distance between these edges of the cutting edges 3 and the outer surface of the press sleeve 1.
• the compression sleeve 1 has axially extending, groove-like depressions 5 over its entire length, the flanks of which each form a longitudinal edge 5 'with the inner shell side.
• six identical groove-like depressions 5 are arranged evenly distributed in the circumferential direction of the press sleeve 1.
• the wall thickness of the compression sleeve 1 is reduced in these areas by the groove-like depressions 5.
• the groove-like depressions 5 are designed as longitudinal grooves with a rectangular cross section; however, a trapezoidal or round cross-section could also be used.
• the groove-like depressions 5 can be produced without cutting or machining.
• the press sleeve 1 On its outer lateral surface, the press sleeve 1 has a plurality of markings 7 for attaching the press tool, by means of which the ring zones which are subjected to pressing are defined.
• the groove-like depressions 5 are provided with the same cross-section throughout the entire length of the press sleeve 1, but it would suffice for the formation of longitudinal cuts according to the invention if the groove-like depressions 5 were essentially in the region of those defined by the markings 7 Ring zones would be formed.
• the two press sleeves 1 are designed such that they have a common outer lateral surface, the same inner diameter, the cutting edges 3 as parts of the same thread and over both Press sleeves 1 have the continuous groove-like depressions 5.
• the press connector In the central region of the press connector, in which the two press sleeves 1 merge into one another, the press connector has a hole 9 which extends from the inner surface to the outer surface. At the end faces, the compression sleeves 1 are chamfered towards the inner surface to facilitate the insertion of a conductor strand.
• a press connector with two press sleeves according to the invention could also have two blind holes, so that the press sleeves are separated by a central wall.
• the inside diameter of the blind holes or the parts of the hollow cylinder could be different, so the press connector could be a reducing connector.
• compression sleeve according to the invention could also be part of a compression cable lug.
• compression sleeve is not limited to electrical conductors. It can also be used to make a mechanical connection to any strand.
• the insulation-free conductor to be pressed is usually first inserted into the press sleeve 1 greased with press grease. Then, a pressing tool, for example a pressing tongs, is placed one after the other at the points marked by the markings 7 and the pressing sleeve is pressed in the corresponding ring zone with a force which results in a predetermined pressing force between the pressing sleeve 1 and the one in it introduced leader leads.
• a pressing tool for example a pressing tongs
• the sleeve wall deforms at these weak points in the respective ring zone such that the longitudinal edges 5 'of the depressions 5 become longitudinal cuts extending in the longitudinal direction of the sleeve.
• Particularly favorable electrical and mechanical properties of the press connection result if the material parts between the groove-like depressions 5 are pressed slightly obliquely inwards during pressing, that is to say with the longitudinal edges 5 'ahead.
• the groove-like depressions 5 also have a free cross-section, albeit reduced, even after the pressing. If, as in the exemplary embodiment, such a recess 5 opens into at least one of the end faces of the press sleeve 1 or at the hole 9, it thus becomes a pressure relief channel for the press grease. If the press grease heats up, it can then expand via these pressure relief channels. This can prevent pressure from building up in the press sleeve, which could lead to expansion of the press sleeve.

Landscapes

• Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
• Ropes Or Cables (AREA)
• Impact Printers (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=6524381

Family Applications (1)

Country Status (5)

Families Citing this family (3)

Family Cites Families (8)

• 1994
  • 1994-07-28 DE DE4426790A patent/DE4426790A1/de not_active Withdrawn
• 1995
  • 1995-07-28 EP EP95930421A patent/EP0721679B1/fr not_active Expired - Lifetime
  • 1995-07-28 WO PCT/EP1995/003008 patent/WO1996003784A1/fr active IP Right Grant
  • 1995-07-28 HU HU9600768A patent/HUT75412A/hu unknown
  • 1995-07-28 AT AT95930421T patent/ATE188069T1/de not_active IP Right Cessation

Non-Patent Citations (1)

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