JP2013191489A - Connector for electric wire with heavy-current shield - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that although many connectors for electric wire with a heavy-current shield are used for electric car or hybrid automobile, an easy-to-assemble connector of simple structure having high watertightness and vibration resistance cannot be found.SOLUTION: The connector for electric wire with a shield consists of a cylindrical connector body, and a cylindrical clamp holder which is inserted into the connector body and coupled therewith by caulking. A tapered slope is provided at a part of the connector close to the inner diameter side rear opening end, and a reverse tapered slope is provided on the inner diameter side of the clamp holder. Watertightness and vibration resistance are provided by fitting an annular packing having a tapered cross section, and a cylindrical clamp material having a reverse tapered cross section in these slopes.

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shielded electric wire connector for large currents, and more particularly to a shielded electric wire connector that is suitable for energizing large currents for electric vehicles and hybrid vehicles.

In recent years, demand for electric vehicles and hybrid vehicles has increased due to factors such as increasing CO ₂ reduction requirements, stricter exhaust gas regulations, and soaring gasoline prices.
In these, a large current flows between various electric devices such as a battery, an inverter, a motor, and a generator, and these are often electrically connected using a connector corresponding to the large current.

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  Electric wires and connectors used in electric vehicles and hybrid vehicles have watertightness that prevents water from entering the wires and connected devices, and vibration resistance that can withstand repeated vibrations due to the nature of the usage environment on the road. Although there is a demand, it has been difficult to find a conventional shielded wire connector for large currents that satisfies both water tightness and vibration resistance with a low-cost and simple structure.

In electric vehicles and hybrid vehicles, shielded wires are often used as noise countermeasures, but it is actually difficult to make reliable electrical connection between the shield and the ground circuit. Therefore, in order to ensure grounding, the structure of the connector for the shielded electric wire has to be complicated, which has been a factor in increasing costs.
As a result of earnest research on shielded wire connectors for large currents, which are in high demand for electric vehicles and hybrid vehicles, which will be increasingly demanded in the future, the inventor has a simple structure with excellent productivity. To develop a new connector for high-current shielded wires that can be easily connected to shielded wires, has sufficient water tightness and vibration resistance, and can also securely ground the shield. It has been successfully proposed as the present invention.

A flange is integrally formed on the outer peripheral side of the cylindrical portion through which the front end side of the shielded electric wire in which the core wire, the insulation coating, the shield, and the outer sheath are laminated concentrically, and the cylindrical portion The inner diameter front side is an insulation coating holding part having an inner diameter slightly larger than the outer diameter of the insulation coating of the shielded electric wire, and the rear part from the base of the flange is the outer skin holding part having an inner diameter larger than the outer diameter of the outer sheath of the shielded electric wire. The rear taper part with the gradually increasing inner diameter is formed behind the outer skin holding part, and the cylindrical clamp holder insertion part with the inner diameter further enlarged is formed integrally with the rear part. Connector body;
A cylindrical shape having an inner diameter through which a shielded electric wire can be inserted, the outer half of the outer peripheral side being a cylindrical insertion portion having an outer diameter slightly smaller than the inner diameter of the clamp holder insertion portion, and the latter half being a step with a sudden decrease in diameter It is a cylindrical rear exposed part with a smaller outer diameter than the inserted part through the part, the reverse taper part gradually decreasing in diameter on the front side of the inner diameter, and the outer diameter of the outer sheath of the shielded electric wire on the rear side A metal clamp holder in which a skin holding portion having a slightly larger inner diameter is formed, and a groove is formed in the center portion of the inserted portion in the circumferential direction;
A metal disc-shaped collar for insulating coating interposed in the insulating coating holding part; and covering the folded portion of the shielded electric wire from the outside by folding the shield on the outer skin surface, and interposing it in the outer skin holding part Cylindrical conductive sleeve;
A rubber rear annular packing having a tapered cross-section with a gradually increasing thickness toward the rear and sheathed between the rear taper portion of the connector body and the outer sheath of the shielded wire;
A metallic disc-shaped outer collar interposed on the rear side of the rear annular packing;
A synthetic resin clamp material having a reverse tapered cross-section with a gradually decreasing thickness toward the rear, and having an annular shape fitted between the reverse tapered portion of the clamp holder and the outer sheath of the shielded electric wire;
A shield for electric wires with a shield for high current is constructed from the above, and the inserted part of the clamp holder is inserted and pressed into the clamp holder insertion part of the connector body, and the clamp holder is fixed to the connector body by crimping the clamp holder insertion part The above problem has been solved.

  Insert the end of the shielded wire through the clamp holder, peel off the outer skin near the end of the tip, expose the shield, fold it back onto the outer skin, and place the conductive sleeve on the outer circumference of the folded shield Cover the conductive sleeve, press the surface of the conductive sleeve from the entire circumference to reduce the diameter of the entire surface, press the inner peripheral wall surface of the conductive sleeve against the shield, and then crimp the spot from the outer periphery. A plurality of depressions are formed at equal intervals, the tips of the depressions are bitten into the shield, the conductive sleeve is fixed to the shield, and both are electrically connected.

  Further, an insulating coating collar is inserted through the insulating coating in front of the conductive sleeve, and the outer collar, rear annular packing, and clamp material are inserted through the outer skin of the conductive sleeve in this order.

In this state, the end part of the end of the shielded electric wire with a conductive sleeve or a clamp attached is inserted into the connector body from the rear,
Press the clamp holder firmly against the connector body. Then, the clamp holder is slightly displaced in the forward direction, and accordingly, the distance between the outer skin and the reverse taper portion is narrowed, and the clamp material positioned therebetween is strongly pressed downward by the inclined surface of the reverse taper portion and eats into the outer skin. The shielded wire is fixed to the connector body via the clamp holder.
In this state, the clamp holder insertion portion of the connector main body that covers and overlaps the insertion portion of the clamp holder from the outside is strongly caulked from the outer peripheral side in the axial direction. At this time, since a groove is formed on the outer periphery of the inserted portion, by caulking the clamp holder insertion portion, a part of the inner wall thickness sinks into the groove, and the clamp holder is connected to the connector. Securely fixed to the body.

  Also, as the clamp holder is pressed against the connector body and the clamp holder insertion part is caulked, the rear annular packing is also pushed forward through the stop collar that is in contact with the front end of the clamp material, and the rear taper part and the outer skin And the gap between the outer skin and the cylindrical portion is sealed, and the water tightness of the portion is secured.

  In this way, the connection relationship between the connector body and the shielded wire is ensured by the clamp material and has sufficient vibration resistance, and water intrusion into the connector body from the rear is prevented by the rear annular packing, which is sufficient. Has water tightness. Further, the shield is reliably conducted to the flange through the conductive sleeve, the insulating coating collar, and the outer collar.

  The shielded electric wire connector according to the present invention has a simple structure and is easy to assemble, yet has sufficient water tightness and vibration resistance, and the shield and the ground circuit are electrically connected. Because it is reliable, it is optimal as a connector for high current connection for electric vehicles and hybrid vehicles used outdoors and in harsh environments with vibration.

The expanded longitudinal cross-sectional view of the connector for electric wires with a shield for large currents concerning this invention. Similarly, the expansion perspective view of the principal part. Similarly, the perspective view which disassembled and drew the main component parts. The perspective view of the electric wire with a shield to which the connector for electric wires with a shield corresponding to a large current concerning the present invention is connected. Similarly, the enlarged side view of the electric wire with a shield explaining the situation where a conductive sleeve is installed. Similarly, the enlarged side view which notched and drawn a part of the state which fixed the electroconductive sleeve to the shield. Similarly, the half-cut longitudinal cross-sectional view of the shielded electric wire in the state where the packing or the clamp material is inserted. Similarly, the longitudinal cross-sectional view of the state which is going to couple | bond a clamp holder with a connector main body in the state which inserted packings, a clamp material, etc. FIG.

  A connector for high-current shielded wires is composed of a cylindrical connector body and a cylindrical clamp holder that is inserted into the connector body and caulked from the outer periphery of the connector body to be coupled to the connector body. A tapered slope is provided near the rear opening end of the clamp holder, a reverse tapered slope is provided on the inner diameter side of the clamp holder, an annular packing having a tapered cross section on the slope and a cylindrical shape having a reverse tapered cross section. The greatest feature is that the clamp member is fitted with water tightness to prevent water from entering the connector body and vibration resistance to withstand repeated vibration.

  FIG. 1 is a longitudinal sectional view of a first embodiment of a shielded electric wire connector for high current according to the present invention, FIG. 2 is an enlarged sectional view of an essential part thereof, and FIG. 3 is an exploded perspective view in which each component is drawn separately. The connector for a shielded wire according to the present invention is a connector body 1, a clamp holder 2 that is caulked to the connector body 1, a conductive sleeve 3 that covers the shielded wire, and a shielded wire 4 that is a clamp holder. It is comprised from the clamp material 30 fixed to 2, the various packing for giving watertightness, etc.

  As shown in FIG. 4, the shielded electric wire 4 fixed to the shielded electric wire connector according to the present invention has a core wire 5, an insulation coating 6, a shield 7, and an outer skin 8 which are laminated concentrically. It is a thing.

The connector body 1 is made of a conductive metal, and as shown in FIGS. 1 and 2, a flange 10 is provided on the outer peripheral side of the cylindrical portion 9 that passes through the front end side of the shielded electric wire 4. A cylindrical insulating coating holding portion 11 having an inner diameter b slightly larger than the outer diameter a of the insulating coating 6 of the shielded electric wire 4 is formed on the front side of the inner diameter of the cylindrical portion 9. A cylindrical outer skin holding portion 12 having an inner diameter d larger than the outer diameter c of the outer skin 8 of the shielded electric wire 4 is formed on the rear side of the base portion 10.
Further, a rear taper portion 14 having an inner diameter gradually increasing is formed behind the outer skin holding portion 12, and a cylindrical clamp holder insertion portion 16 having an inner diameter further enlarged is formed behind the rear taper portion 14. Yes.

  That is, on the inner diameter side of the cylindrical part 19, from the front to the rear, the insulating coating holding part 11 having a small diameter, the outer skin holding part 12 having a large diameter, the rear tapered part 14 having an enlarged diameter, and the clamp holder having an enlarged diameter inserted. The part 16 is formed continuously in series. Further, an O-ring groove 33 is formed on the outer periphery of the cylindrical portion 9 in the vicinity of the front opening, and an O-ring 34 is attached to the O-ring groove 33.

On the other hand, the clamp holder 2 is made of metal and has a cylindrical shape having an inner diameter through which the shielded electric wire 4 can be inserted. The outer half of the outer circumference is a cylindrical shape having an outer circumference slightly smaller than the inner diameter of the clamp holder insertion portion 16. The inserted portion 17 and the latter half of the inserted portion 17 have a cylindrical rear exposed portion 37 having a smaller outer diameter than the inserted portion 17 via a stepped portion 36 whose diameter has been sharply reduced, and the inner diameter front opening end side. Includes a stop collar insertion groove 38 having an enlarged diameter, which accommodates a disc-shaped stop collar 29 described below, a reverse tapered portion 18 having a gradually reduced inner diameter at the rear thereof, and a shield at the rear thereof. A skin holding portion 19 having an inner diameter e slightly larger than the outer diameter c of the outer skin 8 of the electric wire 4 is continuously formed.
Further, a groove 39 having a V-shaped cross section is formed in the circumferential direction at the center of the outer periphery of the inserted portion 17.

  In the figure, reference numeral 22 denotes an insulating coating collar in the form of a metal disk interposed at the front end of the outer skin holding portion 12 of the connector body 1, and has an outer diameter slightly smaller than the inner diameter of the outer skin holding portion 12. And a through hole 23 through which the insulating coating 6 of the shielded electric wire 4 is inserted is formed in the center.

  On the other hand, reference numeral 3 in the figure denotes a conductive sleeve, which has an inner diameter that covers the outer periphery of the shielded wire 4 in a state where the portion near the tip of the shield 7 is folded back to the outer skin 8 side. By forming the depression 45 by reducing the diameter by pressing and by caulking, it is firmly fixed to the folded portion 25 of the shield 7 of the shielded electric wire 4. It is about 4/5 of the part 12. The conductive sleeve 3 has a function of electrically connecting the shield 7 and the flange 10, and in this embodiment, copper is used as a material.

  Further, in the figure, reference numeral 26 denotes an outer collar having a metal plate shape interposed behind the conductive sleeve 3, and has an outer diameter slightly smaller than the inner diameter of the outer skin holding portion 12. Is provided with a through hole 27 through which the outer skin 8 of the shielded electric wire 4 is inserted. In the figure, reference numeral 28 denotes a rubber rear annular packing fitted between the rear taper portion 14 of the connector body 1 and the outer skin 8, and has a substantially trapezoidal cross section in which the thickness gradually increases rearward. The thickness of the front end is substantially the same as the thickness of the conductive sleeve 3, and the thickness of the rear end is substantially the same as the width of the gap at the rear end opening of the rear taper portion. Reference numeral 29 denotes a disc-shaped rubber stop collar interposed behind the rear annular packing 28.

On the other hand, reference numeral 30 in the figure denotes a clamp material, which is a member having a short cylindrical shape made of synthetic resin, has a reverse tapered cross section whose thickness gradually decreases rearward, and the clamp holder 2 The reverse taper portion 18 is fitted between the shielded wire 4 and the outer skin 8 of the shielded electric wire 4, and as shown in FIG. At the same time, a protrusion 35 is formed on the inner diameter side from the rear opening end for biting into the surface of the outer skin 8.
Reference numeral 42 in the figure denotes a terminal for connecting to various internal wiring side devices, and the rear end barrel 43 is bonded to the core wire 5 by being bonded to the shielded electric wire 4.

This Example 1 consists of each said component, and the electric wire 4 with a shield is fixed to this connector with the following procedure.
That is, first, the front end side of the shielded electric wire 4 is inserted into the clamp holder 2, and the outer skin 8 near the end of the front end side is peeled off to expose the shield 7, as shown in FIG. As shown in FIG. 6, the conductive sleeve 3 is covered on the outer periphery of the folded shield 7, and the conductive sleeve 3 is pressed face-down from the entire peripheral side to reduce the diameter of the entire surface. After the inner peripheral wall surface of the conductive sleeve 3 is pressed into contact with the shield 7, it is further spotted from the outer peripheral side to form a plurality of recessed portions 45 at equal intervals, and the tips of the recessed portions 45 are shielded. 7, the conductive sleeve 3 is fixed to the shield 7, and both are electrically connected. In addition, in FIG. 6, the conductive sleeve 3 drawn with a broken line has shown the state before diameter reduction by a press.

  Further, as shown in FIG. 7, an insulation coating collar 22 is inserted through the insulation coating 6 in front of the conductive sleeve 3, and a skin collar 26 and a rear annular packing 28 are inserted into the skin 7 behind the conductive sleeve 3. The clamp members 30 are inserted in this order.

In this state, as shown in FIG. 8, the distal end side portion of the shielded electric wire 4 to which the conductive sleeve 3 and the clamp member 30 are attached is inserted into the connector body 1 from the rear side, and the clamp holder 2 is inserted into the connector body. Press strongly against 1.
Then, as shown in FIG. 1, the clamp holder 2 is slightly displaced in the forward direction, and accordingly, the interval between the outer skin 8 and the reverse taper portion 18 is narrowed, and the clamp member 30 positioned between the outer cover 8 and the reverse taper portion 18 The inclined surface is strongly pressed downward and bites into the outer skin 8 so that the shielded electric wire 4 is fixed to the connector body 1 via the clamp holder 2.
In this state, the clamp holder insertion portion 16 of the connector body 1 that covers and overlaps the insertion portion 17 of the clamp holder 2 is strongly caulked from the outer peripheral side in the axial direction.
At this time, since the groove 38 is formed on the outer periphery of the inserted portion 17, when the clamp holder insertion portion 16 is caulked, a part of the wall thickness on the inner diameter side sinks into the groove 38, and the clamp The holder 2 is securely fixed to the connector body 1.

Further, as the clamp holder 2 is pressed to the connector body 1 side and the clamp holder insertion portion 16 is caulked, the rear annular packing 28 is also pushed forward through the stop collar 29 that is in contact with the front end of the clamp member 30. It fits between the back taper part 14 and the outer skin 8, seals the gap between the outer skin 8 and the cylindrical part 9, and ensures the watertightness of that part.
Further, the insulation coating 6 located in front of the tubular portion 9 is peeled off, the core wire 5 is exposed, and the crimp terminal 32 is crimped to the terminal portion of the core wire 5 to complete the connection to the shielded electric wire 4. To do. The O-ring 34 provided in the vicinity of the front opening end of the cylindrical portion 9 is connected to the water tightness of the coupling portion when the connector body 1 is fixed to an external device such as a motor or a generator using the flange 10. It is for securing.

  In this state, the connection relationship between the connector main body 1 and the shielded electric wire 4 is ensured by the clamp member 30 and has sufficient vibration resistance, and intrusion of water from the rear into the connector main body 1 is caused by the rear annular packing 28. And is sufficiently watertight. The shield 7 is reliably connected to the flange 10 through the conductive sleeve 3, the insulating coating collar 22, and the outer cover collar 26.

  As described above, the shielded electric wire connector for high current according to the present invention has a simple structure and is easy to assemble, and can have sufficient water tightness and vibration resistance. It is most suitable as a connector for electric vehicles and hybrid vehicles used in harsh environments.

  It can be used greatly in electric vehicles and hybrid vehicles.

1. Connector body 2. Clamp holder 3. Conductive sleeve Shielded wire 5. Core wire 6. Insulation coating 7. Shield 8. Skin 9 Tubular section 10. Flange 11. Insulating coating holding part 12. Outer skin holding part 14. Back taper portion 15. Step part 16. Clamp holder insertion part 17. Inserted portion 18. Reverse taper portion 19. Outer skin holding part 21. Front annular packing 22. Insulation coating collar 23. Through hole 25. Folded portion 26. Outer collar 27. Through hole 28. Rear annular packing 29. Stop collar 30. Clamp material 31. Cut section 32. Crimp terminal 33. O-ring groove 34. O-ring 35. Ridge 36. Step part 37. Back exposed part 38. Stop collar insertion groove 39. Groove 42. Terminal 43. Barrel 45. Depression

Claims (1)

A flange is integrally formed on the outer peripheral side of the cylindrical portion through which the front end side of the shielded electric wire in which the core wire, the insulation coating, the shield, and the outer sheath are laminated concentrically, and the cylindrical portion The inner diameter front side is an insulation coating holding part having an inner diameter slightly larger than the outer diameter of the insulation coating of the shielded electric wire, and the rear part from the base of the flange is the outer skin holding part having an inner diameter larger than the outer diameter of the outer sheath of the shielded electric wire. The rear taper part with the gradually increasing inner diameter is formed behind the outer skin holding part, and the cylindrical clamp holder insertion part with the inner diameter further enlarged is formed integrally with the rear part. Connector body;
A cylindrical shape having an inner diameter through which a shielded electric wire can be inserted, the outer half of the outer peripheral side being a cylindrical insertion portion having an outer diameter slightly smaller than the inner diameter of the clamp holder insertion portion, and the latter half being a step with a sudden decrease in diameter It is a cylindrical rear exposed part with a smaller outer diameter than the inserted part through the part, the reverse taper part gradually decreasing in diameter on the front side of the inner diameter, and the outer diameter of the outer sheath of the shielded electric wire on the rear side A metal clamp holder in which a skin holding portion having a slightly larger inner diameter is formed, and a groove is formed in the center portion of the inserted portion in the circumferential direction;
A metal disc-shaped collar for insulating coating interposed in the insulating coating holding part; and covering the folded portion of the shielded electric wire from the outside by folding the shield on the outer skin surface, and interposing it in the outer skin holding part Cylindrical conductive sleeve;
A rubber rear annular packing having a tapered cross-section with a gradually increasing thickness toward the rear and sheathed between the rear taper portion of the connector body and the outer sheath of the shielded wire;
A metallic disc-shaped outer collar interposed on the rear side of the rear annular packing;
A synthetic resin clamp material having a reverse tapered cross-section with a gradually decreasing thickness toward the rear, and having an annular shape fitted between the reverse tapered portion of the clamp holder and the outer sheath of the shielded electric wire;
The clamp holder is inserted into the clamp holder insertion part of the connector body, and the clamp holder is fixed to the connector body by caulking the clamp holder insertion part. Shielded wire connector.

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