JP2005050685A - Connector for electric fuse igniter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of an imbalanced arrangement of conventional locking protrusions that can be arranged only on a semi-circular part of a peripheral surface of a cylinder-shaped connector. <P>SOLUTION: The manufacturing method of the connector includes a first process of insert-forming a cylinder-shaped connector main body having locking parts together with an electric contact part as a first part, and a second process of forming a second part of a case on which a conduction wire housing part is demarcated at the first part by over-molding. At least one of the locking parts is formed on the semicircular part side of the conduction wire housing part of the cylinder-shaped connector main body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electrical connector for an electric fuse igniter, and more particularly to an improved electrical connection of an electrical connector for an electric fuse igniter.

  An airbag system mounted on a vehicle is used to soften the impact of a crew member by momentarily filling a bag of flexible material stored in the front part or side part of a seat with a gas at the time of a vehicle collision or the like. Prevents popping out of parts.

  An explosive mixture is used to fill the air bag with gas, and it is ignited by an electric fuse igniter for ignition when necessary. For example, a connector having a shape described in Japanese Patent No. 3247932 or Japanese Patent Application Laid-Open No. 2000-294343 is used for connection to the ignition device by a connector with an electric system.

  In Japanese Patent No. 3247932, when a conventional ignition tube connector is insert molded, the ferrite bead 120 is displaced with respect to the insulating housing 110 due to injection pressure, so that the terminals of the ignition tube 150 are connected to the electrical contacts 130 and 132. The problem that there is a possibility that the fitting connection cannot be performed is described. To solve this problem, the lid having a positioning post that aligns the wire receiving receptacle portion in the ferrite bead 30 with the wire terminal insertion port. And an ignition tube connector having a structure for fitting and connecting the engagement protrusion on the surface of the insulating housing of the connector.

  Japanese Patent Laid-Open No. 2000-294343 discloses a structure that wipes out the possibility of a connection error to the electrical system. The structure is such that the shape of the connector conductors that hold the respective free ends of the pair of electric wires projecting from the electric fuse igniter to make electrical connection are different from each other on the left and right, and the ferrite member that houses one end of the conductors Provided is a connector for an electric fuse igniter with different distances between holes provided in the connector body for accommodating the other end, and further provided with a locking part in the vicinity of the opening of the axial hole of the connector body. If the axial hole of the connector body part into which the conductor is inserted is not correct, the locking part becomes an obstacle and the connector conductor cannot be inserted.

  However, as is apparent from the drawings disclosed in Japanese Patent No. 3247932 and Japanese Patent Laid-Open No. 2000-294343, each of the members disposed at three positions of the cylindrical connector main body for connector connection. The center of the circumferential width portion of the stop protrusion is bisected by a diameter perpendicular to both the axis of the cylindrical main body and the long axis of the conductor accommodating portion protruding perpendicularly from the axis. It exists on almost the half circumference surface of the side that does not. That is, the respective locking projections arranged at the three locations exist only on the half circumferential surface of the cylindrical main body. Further, the connector connection according to the present invention is performed through the locking projection, and the force in the insertion direction is disproportionately distributed on the half circumferential surface on the side of the conductor housing portion where the locking projection is not provided. Therefore, it cannot be said that the connector is sufficiently connected to an accidental external force.

Conventionally, as a method of manufacturing the connector, a method in which a connector conductor portion provided with an electrical contact portion is formed by insert molding with a plastic resin or the like and then a fitting locking portion is formed by an overmolding process is generally used. Met. However, according to this conventional manufacturing method, in consideration of the mold shape for manufacturing the connector, the locking protrusion is formed on the peripheral surface of the connector body in the overmolding process. Is disposed on a semicircular surface on the conductor housing portion side that is divided by a diameter perpendicular to both the axis of the cylindrical connector body and the long axis of the conductor housing portion protruding perpendicularly to the axis. Was difficult. For this reason, each said latching protrusion can be arrange | positioned only substantially on the substantially half peripheral surface of the said cylindrical connector main body, and when this connector is fitted with a corresponding connector, the latching | locking part of connectors will be carried out. Since the arrangement form is not uniform, it cannot be said that the strength is sufficient, and it is difficult to obtain a stable electrical connection. This is due to the conventional manufacturing method.
The manufacturing method is such that a plastic resin or the like is poured into a mold so that an electrical contact portion is disposed therein, is injection-molded, and is further engaged with a corresponding connector so as to cover the whole. It was overmolding in a predetermined shape together with the protrusion. According to this manufacturing method, the shape of the molding die is taken into consideration because the conductor accommodating portion protruding vertically from the cylindrical connector body as illustrated in the two prior documents is also defined during overmolding. Then, it is difficult to form the locking protrusion on the half circumferential surface of the cylindrical connector main body on the side of the conductor housing portion when viewed from the axial direction of the cylindrical main body. However, there was no other way than to arrange the locking projections in the shape as described in the above-mentioned prior art document.

Japanese Patent No. 3247932 JP 2000-294343 A

  Accordingly, in view of the above problems, an object of the present invention is to provide a connector capable of performing stable connection.

According to a preferred embodiment of the present invention, the connector of the present invention forms a cylindrical main body having an electrical contact portion therein, a conductor accommodating portion extending from the main body, and an engaging portion when the connector is connected. A connector for an electric fuse igniter comprising a plurality of locking portions disposed on the main body,
The plurality of locking portions are arranged at intervals in the circumferential direction of the cylindrical body, and at least one of the locking portions has a bisector of the circumferential width of the locking portion, It exists in the semicircle of the side where the said conducting wire accommodating part extends in the surface perpendicular | vertical to the axial direction of a cylindrical main body, It is characterized by the above-mentioned.

According to another preferred embodiment of the present invention, the connector of the present invention forms a cylindrical main body having an electrical contact portion therein, a conductor accommodating portion extending from the main body, and an engaging portion when the connector is connected. A connector for an electric fuse igniter comprising a plurality of engaging portions disposed on the main body,
Each locking portion has a width portion within each circumference of the cylindrical body having a central angle equally divided by the number of the locking portions in a cross section perpendicular to the axis when viewed from the axial direction of the cylindrical body. And at least one of the locking portions is characterized in that a bisector of the width portion exists in a half circumference on the side where the conducting wire accommodating portion extends.

  For example, if it becomes possible to provide at least one locking projection for fitting connection with a corresponding connector in the vicinity of the conductor housing portion when viewed from the axial direction of the cylindrical body, the cylindrical body It is possible to arrange the locking protrusions on the peripheral surface in a wide variety of forms on the peripheral surface, and the unstable connector connection state caused by the conventional non-uniform arrangement of the locking protrusions. It can be avoided.

  According to still another preferred embodiment of the present invention, the plurality of locking portions of the connector of the present invention are equally arranged in the circumferential direction.

  If a configuration in which the locking projections are uniformly arranged on the peripheral surface of the cylindrical main body of the connector is selected from various arrangement configurations, the connector connection with the most balanced can be achieved.

According to a further preferred embodiment of the present invention, a method for manufacturing a connector for an electric fuse igniter according to the present invention comprises:
A first step of insert-molding a cylindrical connector body defining a locking portion together with an electrical contact portion as a first portion;
And a second step in which a second portion that defines the conductor accommodating portion is molded by overmolding the first portion.

  The manufacturing method of the present invention pays attention to the locking projections of a conventional general electric fuse igniter connector, and the locking projections defined during overmolding of the entire connector in the manufacturing method are, for example, electric By overmolding a part of the cylindrical body so that the conductor housing part is formed after preliminarily defining with the contact part by injection molding, it can be easily molded without being restricted by the conventional molding die Thus, the locking projection can be positioned in an arbitrary arrangement form.

  According to a further preferred embodiment of the present invention, the second part of the connector of the present invention defines a part of the body extending substantially perpendicular to the axis of the cylindrical body. It is.

  As described above, after injection molding with the locking projection in the state where the electrical contact portion is disposed in the first step, for example, with respect to the axis of the cylindrical main body in a state where the conductor portion is accommodated When forming the conducting wire accommodating portion extending in a substantially vertical direction, the conducting wire accommodating portion can be protruded from an arbitrary position of the cylindrical main body having a gap in the axial direction with the locking projection. Thereby, the connector shape which solves the said subject of the arrangement | positioning form of the latching protrusion part on the conventional manufacture can be provided.

  According to a further preferred embodiment of the present invention, in the method for manufacturing a connector of the present invention, a plurality of the locking portions are present and are arranged uniformly in the circumferential direction of the cylindrical main body.

  For example, in the first step, when the plurality of injection-molded locking projections are evenly arranged on the peripheral surface of the cylindrical main body of the connector of the present invention, the fitting connection with the corresponding connector Occasionally, connection failure is less likely to occur for a certain direction of force.

  The above problems can be solved by disclosing a connector manufacturing method and a connector according to the connector manufacturing method of the present invention.

  1A to 1D show a top view, a bottom view, a side view, and a side view from the conductor insertion direction side of the connector 1 for an electric fuse igniter according to the present invention, respectively. In the connector 1 formed of a plastic resin, a front and rear circular-rod-shaped conductor accommodating portion 2 that accommodates the conductor 4 extends from the upper portion of the cylindrical connector body in a direction perpendicular to the axis of the cylindrical connector body. Yes. On the peripheral surface of the cylindrical connector body, there are arranged three locking projections 3 for fitting with the corresponding connectors. Two of them are arranged in the vicinity of the conductor housing portion on the semicircular surface on the conductor housing portion 2 side of the circumferential surface having a diameter perpendicular to the extending direction of the conductor housing portion 2. That is, the respective locking projections arranged at the three locations are not in a form arranged only on the half circumferential surface of the cylindrical connector body as in the prior art. Further, a rubber-like waterproof ring 5 is provided in the groove between the locking projection end and the conductor housing portion in the axial direction of the cylindrical connector body. The waterproof ring 5 is provided to enhance waterproofness, but it is obvious to those skilled in the art that even a form not provided is included in the technical idea of the present invention. FIG. 1B shows a circular cross section 11 corresponding to the bottom surface of the cylindrical connector body. A concave portion 7 for guiding the corresponding connector is disposed at the center of the circular cross section 11, and two electric contact insertion ports 9 are disposed inside thereof.

FIG. 2 is a cross-sectional view of BB ′ in FIG. A method for manufacturing a connector according to the present invention will be described with reference to FIG. As a first step, an injection-molded portion indicated by a hatched portion that rises to the right is obtained with the electrical contact accommodating portion 12 that is electrically connected to the terminal-treated conductor 4 disposed therein. At this time, a locking projection 3 for fitting and connecting with the corresponding connector is also formed in the injection molding part. The center of the width in the circumferential direction of each locking projection is located at the apex that draws an acute isosceles triangle on the circumference of a plane perpendicular to the axis of the cylindrical connector body. Next, as a second step, the front end extending in the vertical direction from the axis of the connector body by overmolding the upper part of the cylindrical connector body with the terminal-treated conductor 4 disposed therein. A rear-circular-shaped lead wire accommodating portion 2 is obtained. The rubber-like waterproof ring 5 is disposed in a groove portion between the conductor housing portion 2 and the end portion of the locking projection 3 that is spaced in the axial direction of the connector main body. As described above, in the first step of manufacturing the connector, two of the locking projections 3 disposed at three locations on the peripheral surface of the cylindrical connector body with the electrical contact portion disposed therein are Since it is disposed closer to the conductor housing portion 2 than in the prior art, the weight applied to the conductor 4 and the housing portion 2 side can be dispersed more than before, and at the same time the strength against a specific force applied from a certain direction is reinforced. ing.
In the present embodiment, the two locking projections 3 are divided into two by the diameter perpendicular to the long axis in the extending direction of the conductor accommodating portion 2 and the axis of the cylindrical connector body. It is obvious to those skilled in the art that the object of the present invention can be achieved if at least one is arranged on the half circumferential surface on the two sides.

  FIG. 3 shows that the three locking projections 3 are evenly arranged on the peripheral surface of the cylindrical connector body, and two of them have overlapping portions with the conductor housing portion 2 when viewed from the axial direction of the cylindrical connector body. Except for this point, it is the same as FIGS. 1 (a) to 1 (d). In this embodiment, since the locking projections 3 are evenly arranged, the force applied to the locking portion when the connector is fitted and connected can be dispersed with a good balance as a whole. As seen from the axial direction of the cylindrical connector body, two of the locking projections 3 have overlapping portions with the conductor housing portion 2 and realize the arrangement of the locking projections, which is difficult in the prior art. ing. Thus, the connector of the present invention has been achieved by paying close attention to the molding order in the manufacturing process.

FIG. 1A is a top view of the connector of the present invention. FIG. 1B is a bottom view of the connector of the present invention. FIG.1 (c) is a side view of the connector of this invention. FIG.1 (d) is the figure seen from the conducting wire insertion direction of the connector of this invention. FIG. 2 is a cross-sectional view taken along the line B-B ′ of FIG. 3 (a) to 3 (d) are the same as FIGS. 1 (a) to (d) except that the locking projections are evenly arranged.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Connector 2 ... Conductor accommodating part 3 ... Locking projection part 4 ... Conductor 5 ... Rubber-like ring 7 ... Concave part 8 ... Circular recessed part 9 ... Electric contactor Insertion slot 11 ・ Circular cross section 12 ・ Electric contact housing

Claims (5)

A cylindrical main body having an electrical contact portion therein, a conductor accommodating portion extending from the main body, and a plurality of locking portions disposed in the main body that form an engaging portion when the connector is connected. A connector for an electric fuse igniter,
The plurality of locking portions are arranged at intervals in the circumferential direction of the cylindrical body, and at least one of the locking portions has a bisector of the circumferential width of the locking portion, A connector, characterized in that it exists in a half circumference on the side where the conducting wire accommodating portion extends in a plane perpendicular to the axial direction of a cylindrical main body.   The connector according to claim 1, wherein the plurality of locking portions are arranged uniformly in the circumferential direction. A method for manufacturing a connector for an electric fuse igniter,
A first step of insert-molding a cylindrical connector body defining a locking portion together with an electrical contact portion as a first portion;
A method for manufacturing a connector comprising: a second step in which a second portion defining a conducting wire accommodating portion is over-molded on the first portion.   The manufacturing method according to claim 3, wherein the second portion defines a part of the main body extending in a direction substantially perpendicular to the axis of the cylindrical main body.   The manufacturing method according to claim 3 or 4, wherein a plurality of the locking portions are present and are arranged uniformly in a circumferential direction of the cylindrical main body.

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