JP2010140706A - Shielded connector and shielding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely role a waterproof function and a shielding function by a simple structure. <P>SOLUTION: Two shielded wires 10 with terminal metal fittings 20 mounted at terminals, and a synthetic resin housing 40 capable of being fit into a mounting hole 83 formed while penetrating a metal case 81 are provided. The housing 40 has cavities 42 with terminal fittings 20 inserted therein, and at an inlet 42A of each cavity 42, a waterproof rubber tap 52 mounted to a terminal of the corresponding shielded wire 10 is insertion-fitted. A conductive contact piece 30 is firmly fixed to a terminal of a braided wire 13 in each shielded wire 10 and housed in the corresponding cavity 42, and accompanied by an effect that the housing 40 is insertion-coupled with the mounting hole 83 of the case 81, a contact point 32 of the contact piece 30 comes in contact with a protruded wall 85 formed in the mounting hole 83. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a shield connector and a shield device using the connector.

Conventionally, what was described in patent document 1 is known as an example of the shield connector using a shielded electric wire. This comprises a plurality of shielded electric wires, and terminal fittings are respectively connected to the ends of the core wires in each shielded electric wire, while the conductive flange is fixed over the exposed ends of each braided wire (shield layer), A housing is formed by resin-molding the fixed portion of the conductive flange, and the outer peripheral portion of the conductive flange protrudes from the housing.
A housing made of a resin mold in such a shielded connector is fitted into a mounting hole opened in a metal device case, and the outer peripheral portion protruding from the housing of the conductive flange is bolted to the surface of the device case. Thus, each braided wire is electrically connected to the device case.
JP 2002-8746 A

In the case where the housing is formed by the resin mold as described above, it is necessary to separately perform a waterproofing process using an adhesive in order to ensure waterproofing at a portion where the shielded electric wire or the conductive flange protrudes, There was a problem that it took a lot of work. Further, in order to connect the braided wire (shield layer) provided individually to each shielded electric wire to the equipment case, it is necessary to adopt a complicated structure, and an improvement thereof has been demanded.
The present invention has been completed based on the above circumstances, and an object of the present invention is to provide a shield connector and a shield device that can reliably perform a waterproof function and a shield function with a simple structure. There is to offer.

  The shield connector of the present invention includes a plurality of shielded electric wires having terminal fittings attached to terminals, and a synthetic resin housing that can be fitted into a mounting hole that is opened through a case of a metal device. The housing is provided with cavities into which the terminal fittings are individually inserted, waterproof rubber plugs are fitted at the entrances of the cavities, and the braided wire ends of the shielded wires are electrically conductive. The contact piece is fixed and accommodated in the corresponding cavity, and the contact piece comes into contact with the contacted portion provided in the attachment hole as the housing is fitted into the attachment hole of the case. It has the feature in the structure which is made.

  Further, the shield device of the present invention is a connector comprising a plurality of shielded wires with terminal fittings attached to terminals, a synthetic resin housing provided with a cavity in which the terminal fittings are accommodated, and the connector A metal device case provided through a mounting hole in which the housing can be fitted, and a waterproof rubber stopper is fitted to the inlet of each cavity of the housing, and the braid in each shielded wire A conductive contact piece is fixed to the end of the wire and accommodated in the corresponding cavity, and the contact piece is inserted into the attachment hole of the case when the connector is fitted in the attachment hole. It is characterized in that a contacted part that can be contacted is provided.

In the above configuration, the terminal fitting and the contact piece provided at the end of the shielded electric wire are inserted into the cavity of the housing, and the waterproof rubber plug is fitted to the entrance of the cavity to achieve waterproofing in the housing. Such a housing is fitted into the mounting hole of the case of the device, and each contact piece is brought into contact with a contacted portion provided in the mounting hole.
Since waterproofing in the housing is performed using a rubber plug, high reliability can be obtained. Since the contact piece fixed to the braided wire is brought into direct contact with the contacted part in the mounting hole, the function of securely connecting the braided wire of each shielded wire to the case of the device can be achieved with a simple structure. it can.

In addition, it is good also as following structures.
(1) On the proximal end side of the contact piece, a crimping portion that is crimped and crimped to the end of the braided wire in the shielded electric wire is provided, and the distal end side contacts the contacted portion of the mounting hole. A contact is provided.
(2) The waterproof rubber plug is an individual rubber plug that is individually attached to the end of each shielded electric wire and is individually fitted to the inlet of the corresponding cavity.

  (3) From the front end side in the insertion direction of the terminal fitting in the mounting hole of the case, a protruding wall that can enter the cavity of the housing of the connector is formed, and this protruding wall serves as the contacted portion. . When the housing of the shield connector is fitted into the mounting hole of the case of the device, the protruding wall provided in the mounting hole relatively enters the cavity of the housing and the contact piece comes into contact.

(4) The front end side of the contact piece is provided to wrap around the outer surface side of the housing, and the inner surface of the mounting hole that is in contact with the wraparound tip is the contacted portion. No special shape change is required for the case mounting holes.
(5) A bracket fixed to the case is attached to the housing of the connector.

  According to the present invention, a waterproof function and a shield function can be reliably achieved with a simple structure.

<Embodiment>
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
The shield connector C of the present embodiment (hereinafter simply referred to as connector C) is an inverter device 80 of an electric vehicle (an example of the device of the present invention) and a motor of a vehicle-mounted electrical device such as an air conditioner (hereinafter referred to as a counterpart device). In order to electrically connect between them, the inverter device 80 is mounted and used. The inverter device 80 is housed in a metal case 81 having a shielding function, which will be described later in detail.

The connector C is connected to the other end side of the two shielded electric wires 10 whose one end side is connected to the counterpart device, and more specifically, can accommodate the terminal fitting 20 connected to each terminal of each shielded electric wire 10. It is attached to the case 81 of the inverter device 80 described above.
As shown in FIG. 1, the shielded electric wire 10 has a structure including a core wire 11, an insulating inner skin 12, a braided wire 13, and an insulating outer skin 14 concentrically in this order from the axial center side.

  The terminal fitting 20 is a screw fastening terminal, which is made of a metal plate having excellent conductivity such as a copper alloy, and a bolt 22 (FIG. 6) is inserted into the distal end side of the terminal body 21 having a tongue-like shape. A possible oval insertion hole 23 is formed, and a wire barrel 25 and an insulation barrel 26 are provided behind the terminal body 21. The terminal fitting 20 has a posture in which the barrels 25 and 26 face downward, and the wire barrel 25 is attached to the end of the core wire 11 exposed by peeling off the shielded electric wire 10, and the insulation barrel is attached to the end of the insulating endothelium 12. 26 are respectively caulked and fixed.

  A contact piece 30 for electrically connecting the braided wire 13 to the case 81 of the inverter device 80 is fixed to the end of the braided wire 13 in the shielded electric wire 10. The contact piece 30 is formed of a metal plate having excellent conductivity, such as a copper alloy, as shown in FIG. 2, and is formed in a crank shape as a whole. On the other hand, a crimping portion 35 that is bent and deformed into a cylindrical shape is formed on the upper stage on the base end side. Further, at the tip of the contact portion 31, a contact 32 is formed to project at the center in the width direction on the upper surface side, and a pair of left and right contacts are provided at both ends in the width direction across the contact 32 on the lower surface side. The contact portion 33 is also formed to protrude.

  The contact piece 30 having the above-described structure is crimped to the outer periphery of the end of the braided wire 13 after the crimp portion 35 formed in a cylindrical shape is inserted into the inner peripheral side of the end of the exposed braided wire 13. It is fixed to the end of the braided wire 13 by crimping and crimping with the 37 attached. When the terminal fitting 20 and the contact piece 30 are fixed as described above, the tip edge of the contact portion 31 of the contact piece 30 is set to reach a position slightly behind the base of the terminal body 21 of the terminal fitting 20. .

The connector C includes a housing 40 made of synthetic resin so as to accommodate the terminal fitting 20 and the contact piece 30 connected to the respective terminals of the two shielded electric wires 10.
The housing 40 includes a block-shaped housing main body 41 having an oval cross section. In the housing main body 41, two cavities 42 having a circular cross section opened on the rear surface are arranged in the lateral (left and right) direction. Is formed. From the rear edge of each cavity 42, a cylindrical portion 43 is formed so as to communicate with the cavity 42, and the inside of the cylindrical portion 43 serves as an inlet 42 </ b> A of the cavity 42.

  An insertion groove 46 for inserting the terminal body 21 of the terminal fitting 20 is formed at a position corresponding to the upper position of each cavity 42 on the front wall 45 of the housing body 41. A guide 47 that guides the terminal body 21 toward the insertion groove 46 is provided around the insertion groove 46 on the rear surface of the front wall 45 of the housing body 41. The terminal main body 21 is inserted into the insertion groove 46 from the inner side and protrudes to the outside. As shown in FIG. 6, the connection portion between the terminal main body 21 and the wire barrel 25 hits the lip on the back side of the insertion groove 46. Pushing is stopped.

  On the surface of the front wall 45 of the housing main body 41 described above, as shown in FIG. 5, the lower one-third region is a stepped surface 48 that is recessed in a predetermined dimension compared to the upper region, A window hole 49 having a horizontally long rectangular front shape is opened at a position along the upper edge of the step surface 48 and corresponding to the lower position of each cavity 42. A ceiling wall 50 is formed to extend inward from the upper edge of the back side of the window hole 49.

  A waterproof rubber stopper 52 is fitted to the inlet 42A of each cavity 42. The rubber plug 52 is made of silicone rubber, and is a so-called individual type, and is formed in a thick ring shape having a center hole 53 through which the shielded electric wire 10 can be tightly inserted. The thickness of the rubber plug 52 is a dimension comparable to more than half of the length of the inlet 42A of the cavity 42. On the inner and outer peripheral surfaces of the rubber plug 52, for example, three lips 54 that are in close contact with the outer peripheral surface of the shielded electric wire 10 (insulating outer sheath 14) or the inner peripheral surface of the inlet 42 </ b> A of the cavity 42 are formed.

  A rubber plug retainer 56 is fitted behind the rubber plug 52 at the inlet 42 </ b> A of the cavity 42. The rubber plug retainer 56 is made of a synthetic resin, has a central hole 57 through which the shielded electric wire 10 can be inserted, and is formed in an annular shape having a thickness slightly thinner than the rubber plug 52. Each rubber cap retainer 56 is formed with a pair of upper and lower locking projections 58, and locking holes 59 are opened on both upper and lower surfaces of the cylindrical portion 43 constituting the inlet 42 </ b> A of the cavity 42. The rubber plug retainer 56 is pushed into the inlet 42A of the cavity 42 following the rubber plug 52, and the upper and lower locking projections 58 are fitted into the corresponding locking holes 59, whereby the rear end surface of the inlet 42A of the cavity 42 is inserted. It is fixed and fixed. Thereby, the rubber stopper 52 is prevented from coming off.

  A fitting groove 60 is formed over the entire circumference of the housing body 41 at a position slightly rearward from the central portion in the length direction, and a rubber ring 61 made of silicone rubber is fitted into the fitting groove 60. It is worn. The rubber ring 61 mainly functions to seal around the housing 40 as will be described later.

A bracket 70 is attached to the housing 40 to attach the connector C to the case 81 of the inverter device 80.
Lock portions 63 are provided at positions between the upper side and the lower side of the cylindrical portions 43 on the rear surface 41A of the housing body 41, respectively. The lock portion 63 is provided between the pair of left and right protective walls 64 so that a lock piece 65 provided with a locking portion 66 on the outer surface side of the tip can be elastically displaced in a posture facing backward. A gap S of a predetermined dimension is provided between the locking portion 66 of the lock piece 65 and the rear surface 41A of the housing body 41 (FIG. 4).

The bracket 70 is made of a metal plate such as a steel plate having a slightly thick wall (thickness slightly smaller than the gap S between the locking portion 66 of the lock piece 65 and the rear surface of the housing 40), and the rear surface 41A of the housing main body 41. The upper and lower ends of the arm plate 72 extending upward from the left and right end portions of the upper edge of the main body plate 71 are bent at a right angle to the front and are attached to the mounting plate 73. Is formed. Both mounting plates 73 have circular insertion holes 76 through which the bolts 75 (FIG. 6) are inserted.
The center part of the main body plate 71 of the bracket 70 is fitted so that the left and right cylindrical parts 43 formed on the rear surface of the housing main body 41 and the region extending over the protective wall 64 in the upper and lower lock parts 63 can be fitted almost tightly. A hole 77 is opened.

  The bracket 70 is pushed into the rear surface 41 </ b> A of the housing body 41 from the rear while elastically displacing the lock piece 65 through the cylindrical portions 43 and the upper and lower protective walls 64 in the fitting hole 77, and the body plate 71 is moved. When it comes into contact with the rear surface 41 </ b> A of the housing body 41, the lock piece 65 is restored and displaced, and the locking portion 66 is locked to the upper and lower hole edges 77 </ b> A of the fitting hole 77, so It has become.

  As shown in FIG. 6, the case 81 of the inverter device 80 is formed in a substantially box shape having an upper surface opened, and the upper surface opening is closed by a lid plate (not shown). An attachment hole 83 for attaching the connector C is formed in the side wall 82 of the case 81 so as to penetrate inside and outside. The mounting hole 83 allows the housing main body 41 of the housing 40 to be closely fitted over the entire length.

A front wall 84 rises at the lower edge of the front end side of the mounting hole 83, and in detail, the front wall 84 is substantially opposite to the step surface 48 provided in the lower region of the front surface of the housing body 41. It is formed in the area to be. From the upper edge of the rear surface of the front wall 84, a protruding wall 85 (corresponding to the contacted portion of the present invention) that can enter the cavity 42 through the upper side of the window hole 49 opened in the front wall 45 of the housing 40. ) Is formed in a horizontal posture facing rearward.
As will be described in detail later, when the housing 40 is fitted in a normal position in the mounting hole 83 of the case 81, the left and right protruding walls 85 on the mounting hole 83 side are between the lower surface of the cavity 42 of the housing 40. In addition, a gap through which the contact portion 31 of the contact piece 30 is inserted is provided to enter the cavity 42 from the front.

On the upper surface of the side wall 82 of the case 81 where the mounting holes 83 are formed, mounting seats 87 on which both mounting plates 73 of the bracket 70 mounted on the housing 40 are respectively mounted are formed. A hole (not shown) is formed.
A pair of terminal blocks 90 are provided in the case 81, and the terminal main body 21 of the terminal fitting 20 protruding from the housing 40 is placed on both the terminal blocks 90 and can be fastened by the bolts 22. ing.

Then, an example of the attachment procedure of the connector C is demonstrated.
As shown in FIG. 1, a rubber plug retainer 56 and a rubber plug 52 are passed through the connection end side of the housing 40 in both shielded wires 10. From this state, the barrels 25 and 26 of the terminal fitting 20 are caulked and crimped to the ends of the exposed core wire 11 and the insulating endothelium 12 in the shielded electric wire 10 as described above, so that the terminal fitting 20 is connected to the core wire 11. It is fixed in an electrically connected state. Subsequently, as already described, the contact piece 30 is caulked and crimped with the end of the braided wire 13 exposed between the crimping portion 35 and the caulking ring 37, so that the braided wire 13 and the electric wire 30 are electrically connected. It is fixed while connected to
When the terminal fitting 20 and the contact piece 30 are properly fixed, the contact portion 31 of the contact piece 30 extends forward at a lower position separated from the barrels 25 and 26 of the terminal fitting 20 by a predetermined dimension, The tip edge of the contact portion 31 reaches a position slightly behind the base of the terminal body 21 of the terminal fitting 20.

On the housing 40 side, a rubber ring 61 is fitted in a fitting groove 60 formed on the outer peripheral surface of the housing body 41. At the same time, the bracket 70 is applied to the rear surface 41 </ b> A of the housing body 41 and is locked and fixed by the lock piece 65.
Thus, the terminal fitting 20 and the contact piece 30 fixed to the end of the corresponding shielded electric wire 10 are inserted from the rear into each cavity 42 of the housing 40 in which the rubber ring 61 and the bracket 70 are assembled. In the middle of insertion, when the tip of the terminal body 21 hits the guide 47, the terminal body 21 is guided to the insertion groove 46 while changing its orientation to the horizontal posture, and the terminal body 21 projects forward through the insertion groove 46, At the same time, the contact portion 31 of the contact piece 30 advances while the lower surface contact portion 33 is in sliding contact with the lower surface of the cavity 42.
When the insertion proceeds and the connecting portion between the terminal main body 21 and the wire barrel 25 hits the lip on the back side of the insertion groove 46, the pushing is stopped. At this time, the tip of the contact portion 31 of the contact piece 30 becomes the stepped surface 48. It reaches the position of the stepped surface 48 facing the window hole 49 opened at.

  When the terminal fitting 20 and the contact piece 30 are inserted to a predetermined position in the cavity 42, the rubber plug 52 that has been passed through is moved forward along the shielded electric wire 10 and fitted into the inlet 42A of the cavity 42, and then Then, the rubber stopper retainer 56 is moved and fitted into the inlet 42A of the cavity 42 from behind the rubber stopper 52 and fixed. As a result, the rubber plug 52 is fitted in the inlet 42A of each cavity 42 in a state in which it is prevented from coming off, and the seal in the cavity 42 is taken.

When the connector C is assembled as described above, the housing 40 is inserted into the mounting hole 83 opened in the side wall 82 of the case 81 of the inverter device 80. When the end of the insertion is reached, the housing 40 faces backward from the front wall 84 of the mounting hole 83. The projecting left and right projecting walls 85 relatively enter the cavity 42 through the window hole 49 of the front wall 45 of the housing 40, and the front end side of the contact portion 31 is in sliding contact with the lower surface of the projecting wall 85. While moving forward. As shown in FIG. 6, when the main body plate 71 of the bracket 70 attached to the housing 40 comes into contact with the outer surface of the side wall 82 of the case 81, the pushing of the housing 40 is stopped. Since it is placed on the mounting seat 87 of the case 81, the housing 40, that is, the connector C is fixed by screwing the bolt 75 passed through the insertion hole 74 of the mounting plate 73 into the bolt hole of the mounting seat 87.
In addition, since the terminal main bodies 21 of the both terminal fittings 20 are placed on the terminal block 90, the terminal fittings 20 correspond by screwing the bolts 22 passed through the insertion holes 23 of the terminal main bodies 21 into the bolt holes of the terminal block 90. The terminal block 90 is fixed in an electrically connected state.

At this time, the tip end side of the contact portion 31 of the contact piece 30 fixed to the braided wire 13 of each shielded electric wire 10 is sandwiched between the lower surface of the cavity 42 and the protruding wall 85 and accordingly protrudes to the upper surface of the contact portion 31. The formed contact 32 is firmly pressed against the lower surface of the protruding wall 85, and electrical connection is established between the braided wire 13 of each shielded electric wire 10 and the case 81.
Further, since the rubber plug 52 is fitted to the inlet 42A of each cavity 42, the inside of the cavity 42 can be sealed with high reliability. Further, since the rubber ring 61 fitted on the outer periphery of the housing 40 is brought into close contact with the inner peripheral surface of the mounting hole 83, the seal around the housing 40 is reliably achieved.

  As described above, according to the present embodiment, since the waterproofing in the housing 40 is performed using the rubber plug 52, the assembly process can be simplified as compared with the case where the housing 40 is formed of mold resin. In addition, the sealing function can be achieved with high reliability. Further, the contact piece 30 is fixed to each braided wire 13, and the contact piece 30 is directly attached to the protruding wall 85 provided inside the attachment hole 83 as the housing 40 is fitted into the attachment hole 83 of the case 81. Therefore, the function of connecting the braided wire 13 of each shielded electric wire 10 to the case 81 can be reliably achieved with a simple structure.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) The contact piece connected to the braided wire of the shielded electric wire has a shape in which a part of the contact piece is exposed on the outer surface side of the housing and can be accommodated in the cavity. The exposed part of the contact piece may be in direct contact with the inner peripheral surface of the mounting hole. The structure of the case mounting hole can be kept simple.

(2) The rubber plug retainer may have, for example, a shape divided into two in the vertical direction. Further, if the rubber stopper itself is provided with a retaining mechanism, the provision of the rubber stopper holder may be omitted.
(3) In the above-described embodiment, the individual rubber plugs fitted into the respective cavities are exemplified as the rubber plugs. However, a collective rubber plug that collectively seals the inlets of the respective cavities may be used.

(4) The bracket used for attaching the housing to the case is not limited to the shape illustrated in the above embodiment, including the shape, the mounting structure to the housing, and the mounting structure to the case. It can be arbitrarily set according to the above.
(5) The present invention can be similarly applied to shield connectors and shield devices having three or more poles.

The exploded sectional view of the connector concerning one embodiment of the present invention. Perspective view of contact piece Connector side view Plan view Front view Sectional view taken along line VI-VI in FIG. 4 with the connector mounted on the case

Explanation of symbols

C ... Shield connector 10 ... Shielded wire 13 ... Braided wire 20 ... Terminal fitting 30 ... Contact piece 31 ... Contact part 32 ... Contact 35 ... Crimping part 40 ... Housing 42 ... Cavity 42A ... (in the cavity 42) 52 ... Rubber plug 70 ... Bracket 80 ... Inverter device (equipment)
81 ... Case 82 ... Side wall 83 ... Mounting hole 85 ... Protruding wall (contacted part)

Claims (7)

A plurality of shielded wires with terminal fittings attached to the terminal, and a synthetic resin housing that can be fitted into a mounting hole that is opened through the case of a metal device,
The housing is provided with a cavity into which the terminal fittings are individually inserted, and a waterproof rubber stopper is fitted to the entrance of each cavity.
A conductive contact piece is fixed to the end of the braided wire in each shielded wire and accommodated in the corresponding cavity, and the contact piece is attached to the fitting hole of the case. The shield connector is configured to be in contact with a contacted portion provided in the mounting hole. On the proximal end side of the contact piece, a crimping portion that is crimped to the end of the braided wire in the shielded electric wire is provided, and a contact point that contacts the contacted portion of the mounting hole is provided on the distal end side. The shield connector according to claim 1, wherein the shield connector is provided. The said waterproof rubber plug is an individual type rubber plug that is individually attached to the end of each shielded electric wire and is individually fitted into the inlet of the corresponding cavity. Shield connector. A connector comprising a plurality of shielded electric wires with terminal fittings attached to the terminal and a synthetic resin housing provided with a cavity in which each terminal fitting is accommodated;
A metal device case provided through a mounting hole into which the housing of the connector can be fitted, and
A waterproof rubber stopper is fitted to the entrance of each cavity of the housing,
A conductive contact piece is fixed to the end of the braided wire in each shielded wire and accommodated in the corresponding cavity, and the connector is fitted in the mounting hole of the case. In some cases, the shield device is provided with a contacted portion that can contact the contact piece. From the front end side in the insertion direction of the terminal fitting in the mounting hole of the case, a protruding wall that can enter the cavity of the housing of the connector is formed, and the protruding wall serves as the contacted portion. The shield device according to claim 4. 5. The contact piece is provided so that a tip end side of the contact piece wraps around an outer surface side of the housing, and an inner surface of the attachment hole with which the tip of the contact piece contacts is the contacted portion. Shield device. The shield device according to any one of claims 4 to 6, wherein a bracket fixed to the case is attached to the housing of the connector.

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