US20110272193A1 - Construction for stopping water from penetrating into drain wire contained in shielded wire and method for stopping water from penetrating thereinto - Google Patents
Construction for stopping water from penetrating into drain wire contained in shielded wire and method for stopping water from penetrating thereinto Download PDFInfo
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- US20110272193A1 US20110272193A1 US13/067,784 US201113067784A US2011272193A1 US 20110272193 A1 US20110272193 A1 US 20110272193A1 US 201113067784 A US201113067784 A US 201113067784A US 2011272193 A1 US2011272193 A1 US 2011272193A1
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- wire
- drain wire
- water
- tube
- heat shrinkable
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/14—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for joining or terminating cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/28—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances natural or synthetic rubbers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
- H01B7/285—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable
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- 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
- H01R13/46—Bases; Cases
- H01R13/52—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases
- H01R13/521—Sealing between contact members and housing, e.g. sealing insert
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- 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
- H01R4/70—Insulation of connections
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49123—Co-axial cable
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49174—Assembling terminal to elongated conductor
- Y10T29/49176—Assembling terminal to elongated conductor with molding of electrically insulating material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49174—Assembling terminal to elongated conductor
- Y10T29/49176—Assembling terminal to elongated conductor with molding of electrically insulating material
- Y10T29/49178—Assembling terminal to elongated conductor with molding of electrically insulating material by shrinking of cover
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/51—Plural diverse manufacturing apparatus including means for metal shaping or assembling
- Y10T29/5136—Separate tool stations for selective or successive operation on work
- Y10T29/5137—Separate tool stations for selective or successive operation on work including assembling or disassembling station
- Y10T29/5139—Separate tool stations for selective or successive operation on work including assembling or disassembling station and means to sever work prior to disassembling
- Y10T29/514—Separate tool stations for selective or successive operation on work including assembling or disassembling station and means to sever work prior to disassembling comprising means to strip insulation from wire
Definitions
- the present invention relates to a construction for stopping water from penetrating into a drain wire contained in a shielded wire and a method for stopping water from penetrating into the drain wire. More particularly the present invention is intended to make slim the construction for stopping water from penetrating into the drain wire led out from an end of the shielded wire disposed in a waterproof region such as an engine room of a vehicle.
- an electric wire used as a shielded wire 1 contains insulated coated electric wires (core electric wires) 2 constituting a plurality of signal wires and a drain wire 3 for grounding use.
- the drain wire 3 and the insulated coated electric wires 2 are sequentially covered with a shielded layer 4 and a sheath 5 made of an insulating resin material (patent document 1).
- the drain wire 3 is made of a large number of conductive strands which are not covered with an insulating coating material and in contact with the shielded layer 4 made of a tube of metal braid or a metal foil.
- the drain wire not covered with an insulating coating material is also led out from the end of the shielded wire. Therefore water penetrates into the appliance through the drain wire.
- the insulated coated electric wire 9 is added to the end of the drain wire 3 , and the end of the drain wire 3 is spliced to the core wire 9 a of the insulated coated electric wire 9 .
- a water-stopping agent such as silicone is applied to a spliced portion, a tape is wound round the portion.
- the spliced water-stopped portion has a large diameter owing to the silicone applied thereto and causes the diameter of a wire harness to be large.
- the water-stopping method disclosed in the patent document 1 has also a similar problem. In recent years, because a car is increasingly equipped with electric and electronic parts, an increase of the shielded wire is expected. Therefore measures for overcoming the enlargement of the spliced water-stopped portion is getting more and more important.
- the shielded wire is connected to an appliance (for example, ECU).
- an appliance for example, ECU.
- the shielded wire Furthermore it is necessary to strip the shielded wire in a length (150 to 200 mm) necessary for the splicing. When the stripping length is long, the shielded wire has a low shielding performance.
- Patent document 1 Japanese Patent Application Laid-Open No. 2002-208321
- Patent document 2 Japanese Patent Application Laid-Open No. 2001-167821
- the present invention has been made in view of the above-described problems. It is an object of the present invention to provide a construction and a method, for stopping water from penetrating into a drain wire, which has a slim water-stopping processing portion, allows water-stopping processing to be accomplished at a low cost, and has a high shielding performance.
- the present invention provides a construction for stopping water from penetrating into a drain wire contained in a shielded wire, wherein a drain wire led out from an end of a shielded wire is covered with a tube made of insulating resin or rubber; and a water-stopping agent is filled between strands of the drain wire contained inside the tube.
- the water-stopping construction of the present invention is capable of greatly making the portion to be water-stopped slim.
- the drain wire is unnecessary to splice the drain wire and an ordinary electric wire with each other. Thereby it is possible to decrease the expenditure of component parts such as an electric wire, a terminal fitting, and the like and the processing expenditure.
- the shielded wire can be cut and stripped in a minimum length of 40 mm from the front end thereof. By decreasing the stripping length of the shielded wire, the shielded wire has an improved shielding performance.
- silicone can be preferably used as the water-stopping agent
- the water-stopping agent is not limited to the silicone. It is possible to use thermoplastic or thermosetting adhesive agents having a necessary flowability.
- the tube consists of a heat shrinkable tube
- a boundary portion between a terminal connected to an end of the drain wire and the heat shrinkable tube is covered with a rubber stopper.
- the drain wire is covered with the heat shrinkable tube and insulated, it is possible to effectively prevent the drain wire from being subjected to water. Further by mounting the rubber stopper on a terminal connection side of the heat shrinkable tube in which the water-stopping agent is filled, it is possible to completely prevent water from penetrating into the heat shrinkable tube from an end surface of the terminal connection side of the heat shrinkable tube. Therefore in the range from the end of the shielded wire to the terminal connection side, it is possible to completely prevent water from penetrating into the drain wire which is led out from the end of the shielded wire and has the terminal mounted on its front end by solderless connection.
- the tube consists of a rubber tube containing silicone or EPDM (ethylene-propylene rubber)
- a terminal connected to an end of the drain wire is connected to a peripheral surface of the rubber tube by solderless connection.
- the tube covering the drain wire is made of a material similar to that of the rubber stopper, and the terminal is directly mounted on the tube by solderless connection. Therefore it is unnecessary to form the rubber stopper in the boundary portion between the terminal and the heat shrinkable tube. Thereby it is possible to decrease the number of parts and unnecessary to perform a rubber stopper-mounting work. Thereby it is possible to improve the workability.
- the shielded wire is disposed in a waterproof region inside a vehicle; and both the terminal connected to the end of the drain wire and a terminal connected to an end of a coated electric wire led out from the shielded wire are connected to an appliance disposed inside the waterproof region.
- the terminal mounted on the end of the drain wire and the terminal connected to the end of the insulated coated electric wire serving as the core wire are inserted into and locked to a water-stopped connector, and the water-stopped connector is fitted in a connector fit-in portion of an ECU mounted in an engine room.
- the present invention provides a method for stopping water from penetrating into the drain wire.
- a first method for stopping water from penetrating into the drain wire includes the steps of stripping a necessary length of a sheath of the shielded wire from a front end of the sheath, and leading out an insulated coated electric wire serving as a core electric wire and a drain wire in contact with a shielding material made of a metal braid or a metal foil; covering the drain wire led out with a heat shrinkable tube and heating the heat shrinkable tube to shrink the heat shrinkable tube or covering the drain wire led out with a rubber tube; and while sucking air from one end of the heat shrinkable tube or the rubber tube, supplying a water-stopping agent into the heat shrinkable tube or the rubber tube from other end thereof to fill the water-stopping agent between strands of the drain wire contained inside the tube.
- the first method in filling the water-stopping agent into the tube, while the water-stopping agent is being supplied to the tube from an opening formed at one end of the tube, air is suck from an opening formed at the other end of the tube. Thereby it is possible to fill the water-stopping agent in the tube smoothly and without generating a gap.
- the drain wire is inserted through the heat shrinkable tube to form the drain wire as a pseudo electric wire, and with the rubber stopper mounted on the peripheral surface of the heat shrinkable tube, the terminal is mounted on the end of the drain wire to suck air from the one end of the tube, and the water-stopping agent is injected into the tube from the other end thereof.
- a second method for stopping water from penetrating into a drain wire including the steps of stripping a necessary length of a sheath of the shielded wire from a front end of the sheath, and leading out an insulated coated electric wire serving as a core electric wire and a drain wire in contact with a shielding material made of a metal braid or a metal foil; dripping or applying a water-stopping agent to the drain wire led out to penetrate the water-stopping agent between strands of the drain wire; and inserting the drain wire into which the water-stopping agent has penetrated through a heat shrinkable tube and heating the heat shrinkable tube for shrinkage or inserting the drain wire into which the water-stopping agent has penetrated through a rubber tube.
- the drain wire into which the water-stopping agent has penetrated is inserted through the heat shrinkable tube or the rubber tube.
- the second method eliminates the need for an operation of sucking air and the use of an air sucking means and is capable of shortening an operation period of time.
- a third method for stopping water from penetrating into a drain wire including the steps of stripping a necessary length of a sheath of the shielded wire from a front end of the sheath, and leading out an insulated coated electric wire serving as a core electric wire and a drain wire in contact with a shielding material made of a metal braid or a metal foil; and inserting the drain wire into a heat shrinkable tube having an obliquely cut portion or a slit portion formed by cut-out at a front end thereof, dripping a water-stopping agent to the obliquely cut portion or the slit portion and placing the water-stopping agent therein, and thereafter heating the heat shrinkable tube for shrinkage.
- the heat shrinkable tube is heated for shrinkage.
- the rubber stop is mounted on the peripheral surface thereof to form the drain wire as the pseudo electric wire.
- the terminal is mounted on the end of the drain wire by solderless connection.
- the third method for stopping water from penetrating into a drain wire including the steps of stripping a necessary length of a sheath of the shielded wire from a front end of the sheath, and leading out an insulated coated electric wire serving as a core electric wire and a drain wire in contact with a shielding material made of a metal braid or a metal foil; and inserting the drain wire into a rubber tube having an obliquely cut portion or a slit portion formed by cut-out at a front end thereof, thereafter dripping a water-stopping agent to the obliquely cut portion or the slit portion and placing the water-stopping agent therein.
- the water-stopping agent is dripped to and held in the obliquely cut portion or the slit portion and in this state, the heat shrinkable tube or the rubber tube is moved to a cut position (end of stripped portion) of the shielded wire.
- the heat shrinkable tube or the rubber tube has the obliquely cut portion or the slit portion formed at the front end thereof. Therefore by horizontally disposing the heat shrinkable tube or the rubber tube with the cut surface thereof or the slit-formed surface thereof located as the upper surface thereof, the dripped water-stopping agent can be received by the lower surface thereof confronting the cut surface thereof or the slit-formed surface thereof and can be penetrated between the strands of the drain wire.
- the third method eliminates the need for sucking air, thus eliminating the use of an air sucking means and shortening an operation period of time. Furthermore because the water-stopping agent is dripped to the obliquely cut portion or the slit portion and held therein, it is possible to quantitatively manage the water-stopping agent. Further by covering the drain wire with the tube after the water-stopping agent is dripped to the tube, the water-stopping agent can be securely penetrated into the periphery of the drain wire.
- the shielded wire is disposed on a horizontal placing surface of a jig; the heat shrinkable tube or the rubber tube through which the drain wire has been inserted is disposed on an inclined surface inclined downward from a side edge of the horizontal placing surface of the jig; and the water-stopping agent is dripped to the obliquely cut portion or the slit portion of the heat shrinkable tube or the rubber tube disposed at an upper position of the inclined surface.
- the tube covering the drain wire is disposed on the inclined surface of the jig, the water-stopping agent which has dripped to the obliquely cut portion of the tube or the slit portion thereof flows along the slope and easily penetrates between the strands of the drain wire.
- the inclination of the inclined surface of the jig is set to 30 to 90 degrees, favorably 30 to 80 degrees, and more favorably 45 to 80 degrees. This is because the larger the inclination is, the more favorable the water-stopping agent drips and thus the water-stopping performance can be improved.
- the inclination is smaller than 30 degrees, the inclination is so gentle that it is difficult to penetrate the water-stopping agent between the strands of the drain wire by flowing it along the inclined surface.
- the inclination is larger than 90 degrees, it is difficult for the obliquely cut portion to receive the water-stopping agent.
- the heat shrinkable tube where the water-stopping agent is dripped and filled is a non-waterproof heat shrinkable tube; a front end of the obliquely cut portion or the slit portion of the non-waterproof heat shrinkable tube is covered with one side of a waterproof heat shrinkable tube with other end of the waterproof heat shrinkable tube in contact with a cut position of the shielded wire; and the waterproof heat shrinkable tube and the non-waterproof heat shrinkable tube are simultaneously heated for shrinkage.
- the heat shrinkable tube when used, it is preferable that a front end of the obliquely cut portion or the slit portion of the rubber tube is covered with one side of a waterproof heat shrinkable tube with other end of the waterproof heat shrinkable tube in contact with a cut position of the shielded wire; and the waterproof heat shrinkable tube is heated for shrinkage.
- the drain wire led out from the shielded wire is covered with the non-waterproof heat shrinkable tube or the rubber tube to form the drain wire as the pseudo coated electric wire, and the non-waterproof heat shrinkable tube or the rubber tube is covered with the waterproof heat shrinkable tube in only the range from the obliquely cut portion or the slit portion thereof to the cut position of the shielded wire. Therefore the drain wire led out from the shielded wire does not have a very large diameter over the entire length thereof.
- the waterproof heat shrinkable tube is capable of enhancing the waterproof performance to a high extent at the obliquely cut portion and the slit portion and reinforces a portion of the drain wire led out from the cut position of the shielded wire. Thereby it is possible to prevent the drain wire from buckling when the drain wire is connected to a connector or the like.
- a fourth method for stopping water from penetrating into a drain wire contained in a shielded wire including the steps of stripping a necessary length of a sheath of the shielded wire from a front end of the sheath, and leading out an insulated coated electric wire serving as a core electric wire and a drain wire in contact with a shielding material made of a metal braid or a metal foil; inserting the drain wire led out through a heat shrinkable tube; heating one portion of the heat shrinkable tube surrounding a front side of the drain wire to shrink the heat shrinkable tube without heating other portion of the heat shrinkable tube disposed at a side of the shielded wire opposite to the front side of the drain wire to form the other portion as a water-stopping agent-receiving portion with a gap held between the drain wire and the other portion of the heat shrinkable tube, and dripping a water-stopping agent to an opening of the water-stopping agent-receiving portion with an open side of the water-stopping agent-recei
- the portion of the heat shrinkable tube to be initially heated for shrinkage has a length about 2 ⁇ 3 of the entire length thereof. This is because as the portion to be initially heated for shrinkage becomes long, the water-stopping agent penetrates into the strands of the drain wire not in its longitudinal direction, but between the strands of the drain wire sufficiently in the water-stopping agent-receiving portion. Thus the water-stopping method has an improved water-stopping performance.
- the water-stopping agent-receiving portion having about 1 ⁇ 3 of the entire length of the heat shrinkable tube has the shape of a deep saucer.
- the water-stopping agent-receiving portion is capable of receiving the water-stopping agent without overflowing it when a predetermined amount of the water-stopping agent which penetrates into the entire length of the drain wire is dripped from above.
- the rubber stopper is mounted on the heat shrinkable tube by fitting the rubber stopper on the heat shrinkable tube. Thereafter the terminal is mounted at the front end of the drain wire by solderless connection. Thereafter the rubber stopper is moved between the terminal and the drain wire.
- a fifth method for stopping water from penetrating into a drain wire contained in a shielded wire including the steps of stripping a necessary length of a sheath of the shielded wire from a front end of the sheath, and leading out an insulated coated electric wire serving as a core electric wire and a drain wire in contact with a shielding material made of a metal braid or a metal foil; inserting the drain wire into a heat shrinkable tube having an opening formed by cutting out a necessary portion thereof and exposing the drain wire from the opening; dripping a water-stopping agent to the opening and placing the water-stopping agent therein, and in the state, heating the heat shrinkable tube for shrinkage; and covering the opening with a waterproof heat shrinkable tube and heating the waterproof heat shrinkable tube for shrinkage.
- a method for stopping water from penetrating into a drain wire contained in a shielded wire including the steps of stripping a necessary length of a sheath of the shielded wire from a front end of the sheath, and leading out an insulated coated electric wire serving as a core electric wire and a drain wire in contact with a shielding material made of a metal braid or a metal foil; inserting the drain wire into a rubber tube having an opening formed by cutting out a necessary portion thereof and exposing the drain wire from the opening; dripping a water-stopping agent to the opening and placing the water-stopping agent therein; and covering the opening with a waterproof heat shrinkable tube and heating the waterproof heat shrinkable tube for shrinkage.
- the fifth method eliminates the need for the operation of sucking air, thus eliminating the use of an air sucking means and shortening an operation period of time. Further because the water-stopping agent is dripped to the opening and held therein, it is possible to quantitatively manage the water-stopping agent. In addition, by covering the drain wire with the waterproof heat shrinkable tube and heating it for shrinkage after the water-stopping agent is dripped to the heat shrinkable tube or the rubber tube, the water-stopping agent can be securely penetrated between the strands of the drain wire and into the periphery thereof.
- a sixth method for stopping water from penetrating into a drain wire contained in a shielded wire including the steps of stripping a necessary length of a sheath of the shielded wire from a front end of the sheath, cutting out a cut position of the shielded wire to form a slit, leading out an insulated coated electric wire serving as a core electric wire from the cut position, and leading out a drain wire in contact with a shielding material made of a metal braid or a metal foil; inserting the drain wire led out through a non-waterproof heat shrinkable tube and heating the non-waterproof heat shrinkable tube for shrinkage or inserting the drain wire led out through a rubber tube; dripping a water-stopping agent to the slit and placing the water-stopping agent therein; and heating a waterproof heat shrinkable tube whose one side covers an end portion of the non-waterproof heat shrinkable tube or the rubber tube at a side of the shielded wire and whose other side covers the slit of the she
- the slit is formed at the cut position of the sheath.
- the dripped water-stopping agent can be received by the lower surface thereof confronting the slit and can be penetrated between the strands of the drain wire.
- the waterproof heat shrinkable tube covering the drain wire is heated for shrinkage. Therefore the water-stopping agent can be securely penetrated between the strands of the drain wire and into the periphery thereof.
- the sixth method eliminates the need for the operation of sucking air, thus eliminating the use of an air sucking means and shortening an operation period of time. Furthermore because the water-stopping agent is dripped to the slit and held therein, it is possible to quantitatively manage the water-stopping agent.
- the rubber tubes which are used in the first through third methods and the fifth and sixth methods are made of a material containing silicone or EPDM (ethylene-propylene rubber).
- the present invention is capable of decreasing the number of work steps and the number of component parts. Further it is unnecessary to strip the shielded wire from the end thereof in the length (not less than 150 mm) required to perform the splicing processing, but a minimum length is sufficient for connecting the terminal to the end of the drain wire by solderless connection. Consequently it is possible to restrain the shielded wire from decreasing its shielding performance.
- FIG. 1 shows an entire shielded wire in which water-stopping processing for a drain wire has been performed in a first embodiment of the present invention.
- FIG. 2 is a perspective view of the shielded wire.
- FIGS. 3(A) and 3(B) are enlarged sectional views of the drain wire for which water-stopping processing has been performed.
- FIGS. 4(A) , 4 (B), and 4 (C) show a first method for water-stopping the drain wire.
- FIG. 5 shows a second method for water-stopping the drain wire.
- FIG. 6 shows a third method for water-stopping the drain wire.
- FIGS. 8(A) and 8(B) show a second modification example of the third method for water-stopping the drain wire.
- FIGS. 9(A) , 9 (B), and 9 (C) show a fourth method for water-stopping the drain wire.
- FIGS. 10(A) and 10(B) show a fifth method for water-stopping the drain wire.
- FIG. 11 shows a second embodiment of the present invention.
- FIG. 12 shows a method for water-stopping a drain wire in the second embodiment of the present invention.
- FIG. 13 shows a third embodiment of the present invention.
- FIGS. 14(A) and 14(B) show a method (sixth method for water-stopping the drain wire) for water-stopping a drain wire in the third embodiment of the present invention.
- FIGS. 15(A) and 15(B) show a conventional art.
- FIG. 16 shows another conventional art.
- FIG. 1 shows a shielded wire 10 of the first embodiment.
- the shielded wire 10 is disposed in a waterproof region of a car such as an engine room.
- An end of the shielded wire 10 is connected with a connector 30 .
- the connector 30 is fitted in a connector accommodation portion of an ECU (not shown) disposed in the waterproof region.
- Water-stopping processing is performed for a portion of a drain wire led out from a cut position of the stripped shielded wire 10 .
- the shielded wire 10 contains two insulated coated electric wires 12 (hereinafter referred to as core wire 12 ) constituting signal wires and a drain wire 11 .
- the drain wire 11 and the core wires 12 are sequentially covered with a shielded layer 13 and a sheath 14 .
- the drain wire 11 is brought into contact with the shielded layer 13 to electrically connect the drain wire 11 and the shielded layer 13 with each other.
- the sheath 14 and the shielded layer 13 are cut and stripped in a minimum length L of about 40 mm from a front end of the shielded wire 10 to lead out the drain wire 11 and the core wire 12 from the shielded wire 10 .
- terminals 20 which are to be inserted into and locked to the connector 30 are connected to a front end of each of the core wire 12 and the drain wire 11 by solderless connection.
- water-stopping processing is performed by inserting the drain wire 11 led out from the end of the shielded wire 10 into a heat shrinkable tube 15 and filling a water-stopping agent 16 inside the heat shrinkable tube 15 .
- a rubber stopper 21 is mounted at a boundary portion between a front end of the heat shrinkable tube 15 and a portion of the drain wire 11 where the terminal 20 is mounted by solderless connection.
- the rubber stopper 21 is also mounted at a boundary portion between each of the core wires 12 and each terminal 20 .
- the sheath 14 and the shielded layer 13 made of a metal braid are cut in a minimum length L from the front end of the shielded wire 10 to strip the sheath 14 and the shielded layer 13 so that the core wire 12 and the drain wire 11 are exposed to the outside from a cut position of the shielded wire 10 .
- the heat shrinkable tube 15 consisting of an insulating resin
- the heat shrinkable tube 15 is heated to shrink it.
- the drain wire 11 is covered with the heat shrinkable tube 15 , with the heat shrinkable tube 15 in close contact with almost the entire length of the periphery of the drain wire 11 .
- the water-stopping agent 16 consisting of silicone is dripped to the drain wire 11 exposed in a gap between a rear end of the heat shrinkable tube 15 and the cut position of the sheath 14 in such a way that an opening 15 a at the rear end of the heat shrinkable tube 15 is closed.
- a hose 17 is connected with the front end of the drain wire 11 with the hose 17 covering an opening 15 b at the front end of the heat shrinkable tube 15 , whereas the other end of the hose 17 is connected with a suction port of a suction pump 18 .
- the suction pump 18 is driven to suck air inside the heat shrinkable tube 15 so that the pressure inside the heat shrinkable tube 15 is decreased.
- the water-stopping agent 16 is sucked into the heat shrinkable tube 15 from the opening 15 a disposed at the rear end thereof to penetrate the water-stopping agent 16 between strands of the drain wire 11 and is hardened with the passage of time.
- the rubber stopper 21 for water-stopping use is mounted on the drain wire 11 at the front end thereof, and the rubber stopper 21 is temporarily fixed to the peripheral surface of the front end of the heat shrinkable tube 15 .
- the drain wire 11 is projected beyond the front end of the heat shrinkable tube 15 in a dimension necessary for mounting the terminal 20 on the projected portion of the front end of the drain wire 11 by solderless connection.
- the rubber stopper 21 is moved to a position where the rubber stopper 21 covers the terminal 20 .
- the other side of the rubber stopper 21 is located as a position where the rubber stopper 21 covers the peripheral surface of the front side of the heat shrinkable tube 15 , thus covering the boundary portion between the portion of the drain wire 11 where the terminal is mounted by solderless connection and the heat shrinkable tube 15 .
- the other end of the heat shrinkable tube 15 is positioned at the cut position of the shielded wire 10 .
- the heat shrinkable tube 15 completely covers the drain wire 11 to form the drain wire 11 as a pseudo coated electric wire.
- the water-stopping agent 16 is supplied to the gap to cover the surface of the rear end of the heat shrinkable tube 15 and the front end of the shielded wire 10 with the water-stopping agent 16 in a molded state. Thus it is possible to prevent water from penetrating into the drain wire 11 from the gap.
- the terminal 20 is mounted at the front end of each of the two core wires 12 by solderless connection, and in a method similar to that carried out for the drain wire 11 , the rubber stopper 21 is mounted at the front end of each of the two core wires 12 .
- the water-stopping processing is performed by covering the drain wire 11 projected in exposure beyond the sheath 14 of the shielded wire 10 with the heat shrinkable tube 15 and filling the water-stopping agent 16 consisting of the silicone in the heat shrinkable tube 15 .
- the boundary portion between the front end of the heat shrinkable tube 15 and the terminal 20 is covered with the rubber stopper 21 , it is possible to prevent the penetration of the water into the heat shrinkable tube 15 from the front end thereof.
- the drain wire 11 is covered with the heat shrinkable tube 15 to form the drain wire 11 as the pseudo electric wire, it is unnecessary to splice the drain wire 11 and the insulated coated electric wire with each other. Therefore it is possible to decrease a material cost and a processing expenditure and set the stripping length L of the sheath of the shielded wire 10 to 40 mm which is the length necessary for mounting the terminal on the drain wire 11 by solderless connection. By minimizing the stripping length L, it is possible to greatly restrain the shielded wire 10 from deteriorating in the shielding performance thereof.
- FIG. 5 shows a second method for stopping the penetration of water into the drain wire 11 .
- the water-stopping agent (silicone) 16 is dripped from above to an intermediate position of the drain wire 11 in its longitudinal direction.
- the dripped water-stopping agent 16 can be penetrated between the strands of the drain wire 11 owing to its flowability.
- the water-stopping agent 16 can be penetrated into the strands of the exposed drain wire 11 over the whole length thereof.
- the state of the penetration of the water-stopping agent 16 into the strands of the drain wire 11 can be inspected visually because the drain wire 11 is not covered with the heat shrinkable tube 15 .
- the drain wire 11 is covered with the heat shrinkable tube 15 from the front end thereof.
- the heat shrinkable tube 15 is heated to shrink it.
- the heat shrinkable tube 15 is brought into close contact with the peripheral surface of the drain wire 11 in which the water-stopping agent has penetrated between the strands.
- the rubber stopper is mounted at the predetermined portion, and the terminal is mounted at the front end of the drain wire 11 by solderless connection.
- the drain wire 11 for which the water-stopping processing has been performed by the second method is similar to that for which the water-stopping processing has been performed by the first method and has a construction, shown in FIGS. 1 through 3 , which allows a slim portion to be water-stopped to be formed on the drain wire 11 .
- the second method has the same operation and effect as those of the first method.
- the water-stopping agent 16 may be applied thereto along the peripheral surface thereof.
- FIG. 6 shows a third method for stopping the penetration of water into the drain wire.
- a water-stopping agent-receiving portion 15 c is formed by obliquely cutting the heat shrinkable tube 15 at the front end of the heat shrinkable tube 15 covering the shielded wire 10 .
- the front end of the heat shrinkable tube 15 is disposed at the cut position of the shielded wire 10 .
- the drain wire 11 is covered with the heat shrinkable tube 15 from the water-stopping agent-receiving portion 15 c formed by obliquely cutting the heat shrinkable tube 15 .
- the movement of the heat shrinkable tube 15 is stopped at a midway position before the water-stopping agent-receiving portion 15 c disposed at the front end of the heat shrinkable tube 15 reaches the cut position.
- the water-stopping agent 16 made of silicone is dripped from above and received by the water-stopping agent-receiving portion 15 c held horizontally with a cut side thereof located as its upper side. The dripped water-stopping agent penetrates into the front end of the drain wire 11 covered with the heat shrinkable tube 15 .
- the heat shrinkable tube 15 is moved to the cut position of the shielded wire 10 with the drain wire 11 covered with the heat shrinkable tube 15 .
- the peripheral surface of the drain wire 11 being inserted into the heat shrinkable tube 15 contacts the water-stopping agent 16 held by the water-stopping agent-receiving portion 15 c, with the water-stopping agent 16 penetrating between the strands of the drain wire 11 .
- the operation of inserting the drain wire 11 through the heat shrinkable tube 15 and the operation of penetrating the water-stopping agent 16 between the strands of the drain wire 11 are simultaneously performed.
- the drain wire 11 is covered with the heat shrinkable tube 15 to the cut position of the shielded wire 10 , the water-stopping agent 16 penetrates between the strands of the drain wire 11 over the whole length thereof.
- the heat shrinkable tube 15 is heated to shrink it and brought into close contact with the peripheral surface of the drain wire 11 in which the water-stopping agent 16 has penetrated between the strands.
- the terminal 20 is mounted on the end of the drain wire 11 projected beyond the front end of the heat shrinkable tube 15 by solderless connection. After the solderless connection of the terminal finishes, the rubber stopper 21 is moved to a boundary position between the terminal and the heat shrinkable tube 15 to cover the boundary position with the rubber stopper 21 .
- the drain wire 11 for which the water-stopping processing has been performed by the third method is similar to that for which the water-stopping processing has been performed by the first and second methods and has a construction, shown in FIGS. 1 through 3 , which allows a slim portion to be water-stopped to be formed on the drain wire 11 .
- the third method has the same operation and effect as those of the first and second methods.
- the dripped water-stopping agent is received by the water-stopping agent-receiving portion formed by obliquely cutting the heat shrinkable tube 15 , the dripped water-stopping agent does not drop, and the amount of the dripped water-stopping agent can be restricted to an amount which can be received by the water-stopping agent-receiving portion 15 c. That is, by adjusting a dimension of the water-stopping agent-receiving portion to be formed by obliquely cutting the heat shrinkable tube 15 , it is possible to quantitatively manage the water-stopping agent.
- FIG. 7 shows a first modification example of the third method for stopping the penetration of water into the drain wire.
- a jig 40 having a horizontal placing surface 40 a and an inclined surface 40 b inclined downward from a side edge of the horizontal placing surface 40 a is used.
- the inclination of the inclined surface 40 b is set to 45 degrees to a horizontal surface.
- a holding plate 40 c for holding the heat shrinkable tube 15 on the inclined surface 40 b with the holding plate 40 c in contact with an end 15 d of the heat shrinkable tube 15 disposed at a side opposite to the position of the water-stopping agent-receiving portion 15 c.
- the shielded wire 10 is disposed on the horizontal placing surface 40 a of the jig 40 .
- the heat shrinkable tube 15 covering the drain wire 11 is disposed on the inclined surface 40 b by holding the heat shrinkable tube 15 by the holding plate 40 c with the water-stopping agent-receiving portion 15 c of the heat shrinkable tube 15 , formed by obliquely cutting the heat shrinkable tube 15 , located at a higher position of the inclined surface 40 b. At this time, the cut side of the water-stopping agent-receiving portion 15 c is located as the upper side thereof.
- the heat shrinkable tube 15 has the same configuration as that used in the third method and consists of a non-waterproof heat shrinkable tube whose inner surface is not provided with the water-stopping agent.
- the water-stopping agent 16 is dripped from above to the water-stopping agent-receiving portion 15 c of the heat shrinkable tube 15 disposed on the inclined surface 40 b of the jig 40 and received by the water-stopping agent-receiving portion 15 c.
- the dripped water-stopping agent penetrates into the front end of the drain wire 11 covered with the heat shrinkable tube 15 .
- the heat shrinkable tube 15 is moved to the cut position of the shielded wire 10 with the drain wire 11 covered with the heat shrinkable tube 15 .
- the peripheral surface of the drain wire 11 being gradually inserted into the heat shrinkable tube 15 contacts the water-stopping agent 16 held by the water-stopping agent-receiving portion 15 c, with the water-stopping agent 16 penetrating between the strands of the drain wire 11 .
- the shielded wire 10 is removed from the jig 40 .
- the heat shrinkable tube 15 is covered with a waterproof heat shrinkable tube 41 whose inner surface is provided with a water-stopping agent 41 a. That is, one side of the waterproof heat shrinkable tube 41 covers the water-stopping agent-receiving portion 15 c of the heat shrinkable tube 15 , whereas the other side of the waterproof heat shrinkable tube 41 is in contact with the cut position of the shielded wire 10 .
- the heat shrinkable tube 15 and the waterproof heat shrinkable tube 41 are heated to shrink them so that the heat shrinkable tube 15 and the waterproof heat shrinkable tube 41 closely contact the peripheral surface of the drain wire 11 .
- the terminal 20 is mounted on the end of the drain wire 11 projected beyond the front end of the heat shrinkable tube 15 by solderless connection.
- the drain wire 11 for which the water-stopping processing has been performed by the first modification example of the third method is similar to that for which the water-stopping processing has been performed by the third method and has a construction which allows a slim portion to be water-stopped to be formed on the drain wire 11 .
- the first modification example of the third method has the same operation and effect as those of the third method.
- the heat shrinkable tube 15 covering the drain wire 11 is disposed on the inclined surface 40 b of the jig 40 , the water-stopping agent 16 which has dripped to the water-stopping agent-receiving portion 15 c of the heat shrinkable tube 15 flows along the slope and easily penetrates between the strands of the drain wire 11 .
- FIG. 8 shows a second modification example of the third method for stopping the penetration of water into the drain wire.
- the water-stopping agent-receiving portion 15 c having a triangular slit 15 e extended in a longitudinal direction of the heat shrinkable tube 15 covering the shielded wire 10 .
- the drain wire 11 is covered with the heat shrinkable tube 15 from the water-stopping agent-receiving portion 15 c having the slit formed therethrough.
- the movement of the heat shrinkable tube 15 is stopped at a midway position before the water-stopping agent-receiving portion 15 c reaches the cut position.
- the water-stopping agent-receiving portion 15 c disposed at the front end of the heat shrinkable tube 15 is held horizontally with the slit 15 e located as the upper side thereof.
- the water-stopping agent 16 is dripped from above and received by the water-stopping agent-receiving portion 15 c.
- the dripped water-stopping agent penetrates into the front end of the drain wire 11 covered with the heat shrinkable tube 15 .
- the heat shrinkable tube 15 is moved to the cut position of the shielded wire 10 with the drain wire 11 covered with the heat shrinkable tube 15 .
- the peripheral surface of the drain wire 11 being gradually inserted into the heat shrinkable tube 15 contacts the water-stopping agent 16 held by the water-stopping agent-receiving portion 15 c, with the water-stopping agent 16 penetrating between the strands of the drain wire 11 .
- the operation of inserting the drain wire 11 through the heat shrinkable tube 15 and the operation of penetrating the water-stopping agent 16 between the strands of the drain wire 11 are simultaneously performed.
- the drain wire 11 is covered with the heat shrinkable tube 15 to the cut position of the shielded wire 10 , the water-stopping agent 16 penetrates between the strands of the drain wire 11 over the whole length thereof.
- the heat shrinkable tube 15 is covered with the waterproof heat shrinkable tube 41 whose inner surface is provided with the water-stopping agent 41 a. That is, one side of the waterproof heat shrinkable tube 41 covers the entire slit 15 e of the heat shrinkable tube 15 , whereas the other end thereof is in contact with the cut position of the shielded wire 10 . In this state, the heat shrinkable tube 15 and the waterproof heat shrinkable tube 41 are heated to shrink them so that the heat shrinkable tube 15 and the waterproof heat shrinkable tube 41 closely contact the peripheral surface of the drain wire 11 .
- the terminal 20 is mounted on the end of the drain wire 11 projected beyond the front end of the heat shrinkable tube 15 by solderless connection.
- the drain wire 11 for which the water-stopping processing has been performed by the second modification example of the third method is similar to that for which the water-stopping processing has been performed by the third method and has a construction which allows a slim portion to be water-stopped to be formed on the drain wire 11 .
- the second modification example of the third method has the same operation and effect as those of the third method.
- the drain wire 11 can be easily inserted into the heat shrinkable tube 15 .
- the heat shrinkable tube 15 is moved to the cut position of the shielded wire 10 .
- FIG. 9 shows a fourth method for stopping the penetration of water into the drain wire.
- the drain wire 11 led out from the cut position of the shielded wire 10 is covered with the heat shrinkable tube 15 from the front end of the drain wire 11 .
- a portion 15 x having a length about the half of the length of the heat shrinkable tube 15 from the front end thereof disposed at the side of the drain wire 11 is heated to shrink the portion 15 x and brought into close contact with the peripheral surface of the drain wire 11 .
- the remaining half of the heat shrinkable tube 15 disposed at the side of the cut position, which has not been heated for shrinkage has a gap between the remaining half of the heat shrinkable tube 15 and the peripheral surface of the drain wire 11 .
- the side of the heat shrinkable tube 15 confronting the cut position is formed as an open end of the heat shrinkable tube 15 having the gap. That is, the remaining half of the length of the heat shrinkable tube 15 has the shape of a deep dish and is denoted as a water-stopping agent-receiving portion 15 y.
- the heat shrinkable tube 15 is disposed vertically with the open end 15 y - 1 of the water-stopping agent-receiving portion 15 y disposed uppermost. As shown in FIG. 9(B) , with the uppermost disposed open end 15 y - 1 spaced at a certain interval from the cut position disposed above the open end 15 y - 1 , the water-stopping agent 16 is dripped from above.
- the dripped water-stopping agent 16 drops into the portion 15 x which has been heated for shrinkage by gravity and penetrates between the strands of the drain wire 11 inserted into the portion 15 x. In addition, the dripped water-stopping agent 16 also penetrates between the strands of a portion of the drain wire 11 inserted into the water-stopping agent-receiving portion 15 y. By dripping a predetermined amount of the water-stopping agent 16 into the water-stopping agent-receiving portion 15 y, the water-stopping agent 16 penetrates between the strands of the drain wire 11 over the whole length thereof.
- the open end 15 y - 1 of the heat shrinkable tube 15 is lifted to bring the open end 15 y - 1 into contact with the cut position of the shielded wire 10 so that the water-stopping agent 16 penetrates between the strands of the drain wire 11 over the whole the length thereof.
- the terminal 20 is mounted on the end of the drain wire 11 projected beyond the front end of the heat shrinkable tube 15 by solderless connection. After the solderless connection of the terminal 20 finishes, the rubber stopper 21 is moved to the boundary position between the terminal 20 and the heat shrinkable tube 15 so that the rubber stopper 21 covers the boundary position.
- the drain wire 11 for which the water-stopping processing has been performed by the first and second methods has a construction, shown in FIGS. 1 through 3 , which allows a slim portion to be water-stopped to be formed on the drain wire 11 .
- the fourth method has the same operation and effect as those of the first and second methods.
- the water-stopping agent-receiving portion can be formed without obliquely cutting the heat shrinkable tube.
- the water-stopping agent-receiving portion has the shape of a deep dish, the water-stopping agent-receiving portion is capable of securely receiving the water-stopping agent dripped from above without overflowing the water-stopping agent.
- the length of the front side of the heat shrinkable tube to be heated for shrinkage and the length of the water-stopping agent-receiving portion thereof not heated it is possible to manage the amount of the water-stopping agent to be dripped.
- the portion of the heat shrinkable tube having a length about the half of the length of the heat shrinkable tube 15 is heated for shrinkage, and the portion having about the remaining half of the length thereof is formed as the water-stopping agent-receiving portion.
- the portion of the heat shrinkable tube having a length about 2 ⁇ 3 of the length thereof is heated for shrinkage and even though the portion having a length about 1 ⁇ 3 of the length thereof is formed as the water-stopping agent-receiving portion, it is possible to form a preferable portion to be water-stopped.
- the portion to be water-stopped is formed by setting the longitudinal direction of the heat shrinkable tube 15 to a vertical direction. But the portion to be water-stopped may be formed by carrying out the fourth method in a state where the heat shrinkable tube 15 is placed on the inclined surface 40 b of the jig 40 used in the first modification of the third method.
- FIG. 10 shows a fifth method for stopping the penetration of water into the drain wire 11 .
- the heat shrinkable tube 15 which covers the drain wire 11 is cut out at a midway position to form an opening 15 d.
- the heat shrinkable tube 15 is moved to cover the drain wire 11 till the heat shrinkable tube 15 reaches the cut position.
- the water-stopping agent 16 made of silicone is dripped from above to the opening 15 d disposed at the upper side of the heat shrinkable tube 15 held horizontally and received by the periphery of the opening 15 d and a portion of the heat shrinkable tube 15 confronting the opening 15 d.
- the dripped water-stopping agent 16 penetrates between the strands of the drain wire 11 covered with the heat shrinkable tube 15 .
- the heat shrinkable tube 15 is heated to shrink it and brought into close contact with the peripheral surface of the drain wire 11 in which the water-stopping agent 16 has penetrated between the strands.
- the waterproof heat shrinkable tube 19 is heated for shrinkage.
- the opening 15 d is covered with a water-stopping agent 19 a provided on the inner peripheral surface of the waterproof heat shrinkable tube 19 , and the water-stopping agent 15 is filled between the peripheral surface of the heat shrinkable tube 15 and the inner peripheral surface of the waterproof heat shrinkable tube 19 .
- the terminal 20 is mounted on the end of the drain wire 11 projected beyond the front end of the heat shrinkable tube 15 by solderless connection.
- the drain wire 11 waterproofed by the fifth method has a little larger diameter than the drain wire waterproofed by the above-described methods by the thickness of the waterproof heat shrinkable tube 19 mounted on the heat shrinkable tube 15 .
- the waterproof heat shrinkable tube 19 it is possible to securely prevent the penetration of water into the heat shrinkable tube 15 for which water-stopping processing has been performed from the opening 15 d and in addition keep the terminal connected to the front end of the drain wire straight in inserting the terminal into a connector to connect the terminal to a mating terminal. Therefore a connector connection work can be facilitated.
- the second method at the time of the filling of the water-stopping agent, it is unnecessary to suck air and thus it is possible to decrease an operation period of time. Further because the dripped water-stopping agent is received by the periphery of the opening of the heat shrinkable tube, the dripped water-stopping agent does not drop, and the amount of the dripped water-stopping agent can be restricted to the amount which can be received by the periphery of the opening.
- the waterproof heat shrinkable tube 19 is directly mounted on the opening 15 d of the heat shrinkable tube 15 .
- the waterproof heat shrinkable tube 19 may be mounted on the opening 15 d of the heat shrinkable tube 15 , after a tape is wound around the opening 15 d to prevent the water-stopping agent from overflowing.
- FIGS. 11 and 12 show the second embodiment of the present invention.
- water-stopping processing is performed by mounting a rubber tube 50 containing silicone or EPDM (ethylene-propylene rubber) on the drain wire 11 led out from the end of the shielded wire 10 instead of the heat shrinkable tube and filling the water-stopping agent 16 inside the rubber tube 50 .
- silicone or EPDM ethylene-propylene rubber
- a rubber stopper 50 a having a configuration approximately the same as that of the rubber stopper of the first embodiment is formed integrally with a front end of the rubber tube 50 positioned at the end of the drain wire 11 .
- One barrel 20 a of the terminal 20 is mounted on the end of the drain wire 11 by solderless connection, whereas other barrel 20 b thereof is mounted on the rubber stopper 50 a of the rubber tube 50 by solderless connection.
- a gap is formed between the other end of the rubber tube 50 and the cut position of the shielded wire 10 .
- a tape 51 is wound around the rubber tube 50 in the range from the other end thereof to the cut position of the shielded wire 10 .
- the water-stopping agent (silicone) 16 is dripped to the drain wire 11 from above at an intermediate position thereof in its longitudinal direction.
- the rubber tube 50 is mounted on the drain wire 11 from the front end thereof. After a portion where the water-stopping agent 16 is dripped is covered with the rubber tube 50 , the terminal 20 is mounted at the front end of the rubber tube 50 by solderless connection, and the tape 51 is wound round the other side of the rubber tube 50 .
- the tape 51 is wound round the other side of the rubber tube 50 .
- the other side of the rubber tube 50 may be covered with a waterproof heat shrinkable tube.
- the second embodiment similarly to the first embodiment, has the construction which allows the drain wire to be provided with a slim portion to be water-stopped.
- the second method has the same operation and effect as those of the first method.
- the second embodiment eliminates the need for the provision of the step of heating the heat shrinkable tube and allows the terminal to be directly mounted on the end of the rubber tube 50 by solderless connection, thus eliminating the need for the use of the rubber stopper and decreasing the number of parts and operation steps.
- the water-stopping method of the second embodiment corresponds to the second water-stopping method of the first embodiment.
- the rubber tube 50 as in the case of the second embodiment, it is possible to adopt a method (step of heating the heat shrinkable tube 15 for shrinkage is excluded) corresponding to the first, third or fifth water-stopping method of the first embodiment.
- FIGS. 13 and 14 show the third embodiment of the present invention.
- a triangular slit 14 a extended in the longitudinal direction of the sheath 14 by cut-out.
- the drain wire 11 is led out through the slit 14 a.
- the drain wire 11 is led out from the slit 14 a in a direction opposite to the position of the cut position of the sheath 14 and held at a narrow portion of the slit 14 a.
- the drain wire 11 led out is folded back to the cut position of the sheath 14 at a necessary portion.
- the water-stopping agent 16 is filled between the strands of the drain wire 11 at a position where the drain wire 11 is led out, whereas the non-waterproof heat shrinkable tube 15 is heated to shrink it with the front side of the drain wire 11 covered with a non-waterproof heat shrinkable tube 15 .
- the rubber stopper 21 is mounted at the front end of the non-waterproof heat shrinkable tube 15 , and the terminal 20 is mounted on the end of the drain wire 11 by solderless connection.
- a portion of the drain wire 11 exposed between the sheath 14 and the non-waterproof heat shrinkable tube 15 is covered with the waterproof heat shrinkable tube 19 and heated for shrinkage.
- the end portion of the non-waterproof heat shrinkable tube 15 at the shielded wire side is covered with one side of the waterproof heat shrinkable tube 19
- the slit 14 a of the sheath 14 is covered with the other side of the waterproof heat shrinkable tube 19 .
- the periphery of the portion of the drain wire 11 exposed to the outside between the sheath 14 and the non-waterproof heat shrinkable tube 15 is covered with the water-stopping agent 19 a of the waterproof heat shrinkable tube 19 .
- the core wire 12 is led out from the end of the sheath 14 , and the drain wire 11 is led out through the slit 14 a formed at the cut position of the sheath 14 .
- the non-waterproof heat shrinkable tube 15 is mounted at the front side of the drain wire 11 and heated to shrink it.
- the water-stopping agent 16 is dripped to the slit 14 a and held therein, and the waterproof heat shrinkable tube 19 is mounted on the drain wire 11 exposed between the sheath 14 and the non-waterproof heat shrinkable tube 15 and heated to shrink it.
- the rubber stopper 21 is mounted at the front end of the drain wire 11 , and the terminal 20 is mounted thereon by solderless connection.
- the third embodiment has a construction which allows the drain wire to be provided with a slim portion to be water-stopped.
- the third embodiment has the same operation and effect as those of the first embodiment.
- it is unnecessary to suck air it is unnecessary to provide an air-sucking means and possible to decrease an operation period of time.
- the water-stopping agent 16 is dripped to the slit 14 a of the sheath 14 and held therein, it is possible to quantitatively manage the water-stopping agent.
- the rubber tube of the second embodiment may be used.
Abstract
A Drain wire led out from the interior to the exterior of a shielded wire is covered with a heat shrinkable tube made of an insulating resin or with a rubber tube including silicon or EPDM (ethylene-propylene rubber). A water-stop agent is penetrated between the element wires of the drain wire in the heat shrinkable tube or the rubber tube. In addition, A boundary portion between a terminal connected to an end of the drain wire and the heat shrinkable tube is covered with a rubber stopper.
Description
- This is a Division of application Ser. No. 12/223,169 filed Jul. 24, 2008, which is a National Phase of Application No. PCT/JP2007/051350 filed Jan. 29, 2007. The disclosure of the prior applications is hereby incorporated by reference herein in its entirety.
- 1. Technical Field
- The present invention relates to a construction for stopping water from penetrating into a drain wire contained in a shielded wire and a method for stopping water from penetrating into the drain wire. More particularly the present invention is intended to make slim the construction for stopping water from penetrating into the drain wire led out from an end of the shielded wire disposed in a waterproof region such as an engine room of a vehicle.
- 2. Background Art
- In an electric wire disposed in a car, a shielded wire is used at a portion demanded to shield noise. As shown in FIG. 15(A), an electric wire used as a shielded
wire 1 contains insulated coated electric wires (core electric wires) 2 constituting a plurality of signal wires and adrain wire 3 for grounding use. Thedrain wire 3 and the insulated coatedelectric wires 2 are sequentially covered with a shieldedlayer 4 and asheath 5 made of an insulating resin material (patent document 1). - The
drain wire 3 is made of a large number of conductive strands which are not covered with an insulating coating material and in contact with the shieldedlayer 4 made of a tube of metal braid or a metal foil. - As shown in
FIG. 15(B) , to mount the shieldedwire 1 on a connector housing, it is necessary to process an end of the shieldedwire 1. That is, it is necessary to perform the process of stripping thesheath 5 and the shieldedlayer 4 in a length of 80 to 200 mm, strip the end of the exposed coatedelectric wire 2 to mount a terminal fitting 7 on the coatedelectric wire 2 by solderless connection, mount aterminal 8 on thedrain wire 3, and insert theterminals terminals - In connecting the terminal with the end of an electric wire disposed in a waterproof region such as an engine room of a vehicle and the like and connecting the terminal with a connector, in Japanese Patent Application Laid-Open No. 2001-167821 (patent document 2), there is disclosed a water-stopping method to be carried out by molding a connection portion of a terminal including an exposed portion of a core wire with a sealing resin having a high viscosity.
- In connecting the shielded wire with an appliance inside the engine room to be waterproofed, the drain wire not covered with an insulating coating material is also led out from the end of the shielded wire. Therefore water penetrates into the appliance through the drain wire. Thus as shown in
FIG. 16 , the insulated coatedelectric wire 9 is added to the end of thedrain wire 3, and the end of thedrain wire 3 is spliced to thecore wire 9 a of the insulated coatedelectric wire 9. In addition, after a water-stopping agent such as silicone is applied to a spliced portion, a tape is wound round the portion. - But the spliced water-stopped portion has a large diameter owing to the silicone applied thereto and causes the diameter of a wire harness to be large. The water-stopping method disclosed in the
patent document 1 has also a similar problem. In recent years, because a car is increasingly equipped with electric and electronic parts, an increase of the shielded wire is expected. Therefore measures for overcoming the enlargement of the spliced water-stopped portion is getting more and more important. - In addition, because by splicing the insulated coated
electric wire 9 to thedrain wire 3, the shielded wire is connected to an appliance (for example, ECU). Thus the processing expenditure is high and thus the water-stopping construction costs high in the above-described conventional art. - Furthermore it is necessary to strip the shielded wire in a length (150 to 200 mm) necessary for the splicing. When the stripping length is long, the shielded wire has a low shielding performance.
- Patent document 1: Japanese Patent Application Laid-Open No. 2002-208321
- Patent document 2: Japanese Patent Application Laid-Open No. 2001-167821
- The present invention has been made in view of the above-described problems. It is an object of the present invention to provide a construction and a method, for stopping water from penetrating into a drain wire, which has a slim water-stopping processing portion, allows water-stopping processing to be accomplished at a low cost, and has a high shielding performance.
- To solve the above-described problems, the present invention provides a construction for stopping water from penetrating into a drain wire contained in a shielded wire, wherein a drain wire led out from an end of a shielded wire is covered with a tube made of insulating resin or rubber; and a water-stopping agent is filled between strands of the drain wire contained inside the tube.
- In this water-stopping construction, even though water penetrates into the tube covering the drain wire from the end thereof, the penetration of the water can be prevented by the water-stopping agent filled inside the tube. Even though the water-stopping agent is filled inside the tube, there is a slight increase of the outer diameter of a portion thereof to be water-stopped. Compared with a conventional water-stopping method of applying a water-stopping agent such as silicone to the drain wire or molding the drain wire with resin, the water-stopping construction of the present invention is capable of greatly making the portion to be water-stopped slim.
- Further by covering the drain wire with the tube to form the drain wire as a pseudo coated electric wire, it is unnecessary to splice the drain wire and an ordinary electric wire with each other. Thereby it is possible to decrease the expenditure of component parts such as an electric wire, a terminal fitting, and the like and the processing expenditure.
- By making the tube transparent, the water-stopping agent-filled state is visible from the outside. The shielded wire can be cut and stripped in a minimum length of 40 mm from the front end thereof. By decreasing the stripping length of the shielded wire, the shielded wire has an improved shielding performance.
- Although silicone can be preferably used as the water-stopping agent, the water-stopping agent is not limited to the silicone. It is possible to use thermoplastic or thermosetting adhesive agents having a necessary flowability.
- When the tube consists of a heat shrinkable tube, a boundary portion between a terminal connected to an end of the drain wire and the heat shrinkable tube is covered with a rubber stopper.
- Because the drain wire is covered with the heat shrinkable tube and insulated, it is possible to effectively prevent the drain wire from being subjected to water. Further by mounting the rubber stopper on a terminal connection side of the heat shrinkable tube in which the water-stopping agent is filled, it is possible to completely prevent water from penetrating into the heat shrinkable tube from an end surface of the terminal connection side of the heat shrinkable tube. Therefore in the range from the end of the shielded wire to the terminal connection side, it is possible to completely prevent water from penetrating into the drain wire which is led out from the end of the shielded wire and has the terminal mounted on its front end by solderless connection.
- When the tube consists of a rubber tube containing silicone or EPDM (ethylene-propylene rubber), a terminal connected to an end of the drain wire is connected to a peripheral surface of the rubber tube by solderless connection.
- In the above-described construction, the tube covering the drain wire is made of a material similar to that of the rubber stopper, and the terminal is directly mounted on the tube by solderless connection. Therefore it is unnecessary to form the rubber stopper in the boundary portion between the terminal and the heat shrinkable tube. Thereby it is possible to decrease the number of parts and unnecessary to perform a rubber stopper-mounting work. Thereby it is possible to improve the workability.
- The shielded wire is disposed in a waterproof region inside a vehicle; and both the terminal connected to the end of the drain wire and a terminal connected to an end of a coated electric wire led out from the shielded wire are connected to an appliance disposed inside the waterproof region.
- For example, the terminal mounted on the end of the drain wire and the terminal connected to the end of the insulated coated electric wire serving as the core wire are inserted into and locked to a water-stopped connector, and the water-stopped connector is fitted in a connector fit-in portion of an ECU mounted in an engine room.
- Thereby it is possible to prevent water from penetrating into the appliance through the drain wire and the appliance from malfunctioning.
- The present invention provides a method for stopping water from penetrating into the drain wire.
- A first method for stopping water from penetrating into the drain wire includes the steps of stripping a necessary length of a sheath of the shielded wire from a front end of the sheath, and leading out an insulated coated electric wire serving as a core electric wire and a drain wire in contact with a shielding material made of a metal braid or a metal foil; covering the drain wire led out with a heat shrinkable tube and heating the heat shrinkable tube to shrink the heat shrinkable tube or covering the drain wire led out with a rubber tube; and while sucking air from one end of the heat shrinkable tube or the rubber tube, supplying a water-stopping agent into the heat shrinkable tube or the rubber tube from other end thereof to fill the water-stopping agent between strands of the drain wire contained inside the tube.
- In the first method, in filling the water-stopping agent into the tube, while the water-stopping agent is being supplied to the tube from an opening formed at one end of the tube, air is suck from an opening formed at the other end of the tube. Thereby it is possible to fill the water-stopping agent in the tube smoothly and without generating a gap.
- More specifically, when the heat shrinkable tube is used, the drain wire is inserted through the heat shrinkable tube to form the drain wire as a pseudo electric wire, and with the rubber stopper mounted on the peripheral surface of the heat shrinkable tube, the terminal is mounted on the end of the drain wire to suck air from the one end of the tube, and the water-stopping agent is injected into the tube from the other end thereof.
- A second method for stopping water from penetrating into a drain wire, including the steps of stripping a necessary length of a sheath of the shielded wire from a front end of the sheath, and leading out an insulated coated electric wire serving as a core electric wire and a drain wire in contact with a shielding material made of a metal braid or a metal foil; dripping or applying a water-stopping agent to the drain wire led out to penetrate the water-stopping agent between strands of the drain wire; and inserting the drain wire into which the water-stopping agent has penetrated through a heat shrinkable tube and heating the heat shrinkable tube for shrinkage or inserting the drain wire into which the water-stopping agent has penetrated through a rubber tube.
- By applying the water-stopping agent to the drain wire along the surface thereof instead of adopting the method of dripping the water-stopping agent to the drain wire, it is possible to penetrate the applied water-stopping agent between the strands of the drain wire.
- In the second method, the drain wire into which the water-stopping agent has penetrated is inserted through the heat shrinkable tube or the rubber tube. Thus unlike the first method, the second method eliminates the need for an operation of sucking air and the use of an air sucking means and is capable of shortening an operation period of time.
- A third method for stopping water from penetrating into a drain wire, including the steps of stripping a necessary length of a sheath of the shielded wire from a front end of the sheath, and leading out an insulated coated electric wire serving as a core electric wire and a drain wire in contact with a shielding material made of a metal braid or a metal foil; and inserting the drain wire into a heat shrinkable tube having an obliquely cut portion or a slit portion formed by cut-out at a front end thereof, dripping a water-stopping agent to the obliquely cut portion or the slit portion and placing the water-stopping agent therein, and thereafter heating the heat shrinkable tube for shrinkage.
- More specifically, after the shielded wire is covered with the heat shrinkable tube to the end thereof, the heat shrinkable tube is heated for shrinkage. After the heat shrinkable tube shrinks, the rubber stop is mounted on the peripheral surface thereof to form the drain wire as the pseudo electric wire. Thereafter the terminal is mounted on the end of the drain wire by solderless connection.
- The third method for stopping water from penetrating into a drain wire, including the steps of stripping a necessary length of a sheath of the shielded wire from a front end of the sheath, and leading out an insulated coated electric wire serving as a core electric wire and a drain wire in contact with a shielding material made of a metal braid or a metal foil; and inserting the drain wire into a rubber tube having an obliquely cut portion or a slit portion formed by cut-out at a front end thereof, thereafter dripping a water-stopping agent to the obliquely cut portion or the slit portion and placing the water-stopping agent therein.
- In the third method, it is preferable that after the drain wire is midway inserted into the heat shrinkable tube or the rubber tube, the water-stopping agent is dripped to and held in the obliquely cut portion or the slit portion and in this state, the heat shrinkable tube or the rubber tube is moved to a cut position (end of stripped portion) of the shielded wire.
- In the third method, the heat shrinkable tube or the rubber tube has the obliquely cut portion or the slit portion formed at the front end thereof. Therefore by horizontally disposing the heat shrinkable tube or the rubber tube with the cut surface thereof or the slit-formed surface thereof located as the upper surface thereof, the dripped water-stopping agent can be received by the lower surface thereof confronting the cut surface thereof or the slit-formed surface thereof and can be penetrated between the strands of the drain wire.
- Unlike the first method, the third method eliminates the need for sucking air, thus eliminating the use of an air sucking means and shortening an operation period of time. Furthermore because the water-stopping agent is dripped to the obliquely cut portion or the slit portion and held therein, it is possible to quantitatively manage the water-stopping agent. Further by covering the drain wire with the tube after the water-stopping agent is dripped to the tube, the water-stopping agent can be securely penetrated into the periphery of the drain wire.
- In the third method, it is preferable that the shielded wire is disposed on a horizontal placing surface of a jig; the heat shrinkable tube or the rubber tube through which the drain wire has been inserted is disposed on an inclined surface inclined downward from a side edge of the horizontal placing surface of the jig; and the water-stopping agent is dripped to the obliquely cut portion or the slit portion of the heat shrinkable tube or the rubber tube disposed at an upper position of the inclined surface.
- In the above-described construction, because the tube covering the drain wire is disposed on the inclined surface of the jig, the water-stopping agent which has dripped to the obliquely cut portion of the tube or the slit portion thereof flows along the slope and easily penetrates between the strands of the drain wire.
- The inclination of the inclined surface of the jig is set to 30 to 90 degrees, favorably 30 to 80 degrees, and more favorably 45 to 80 degrees. This is because the larger the inclination is, the more favorable the water-stopping agent drips and thus the water-stopping performance can be improved. When the inclination is smaller than 30 degrees, the inclination is so gentle that it is difficult to penetrate the water-stopping agent between the strands of the drain wire by flowing it along the inclined surface. When the inclination is larger than 90 degrees, it is difficult for the obliquely cut portion to receive the water-stopping agent.
- In the third method, when the heat shrinkable tube is used, it is preferable that the heat shrinkable tube where the water-stopping agent is dripped and filled is a non-waterproof heat shrinkable tube; a front end of the obliquely cut portion or the slit portion of the non-waterproof heat shrinkable tube is covered with one side of a waterproof heat shrinkable tube with other end of the waterproof heat shrinkable tube in contact with a cut position of the shielded wire; and the waterproof heat shrinkable tube and the non-waterproof heat shrinkable tube are simultaneously heated for shrinkage.
- In the third method, when the heat shrinkable tube is used, it is preferable that a front end of the obliquely cut portion or the slit portion of the rubber tube is covered with one side of a waterproof heat shrinkable tube with other end of the waterproof heat shrinkable tube in contact with a cut position of the shielded wire; and the waterproof heat shrinkable tube is heated for shrinkage.
- In the above-described construction, the drain wire led out from the shielded wire is covered with the non-waterproof heat shrinkable tube or the rubber tube to form the drain wire as the pseudo coated electric wire, and the non-waterproof heat shrinkable tube or the rubber tube is covered with the waterproof heat shrinkable tube in only the range from the obliquely cut portion or the slit portion thereof to the cut position of the shielded wire. Therefore the drain wire led out from the shielded wire does not have a very large diameter over the entire length thereof. The waterproof heat shrinkable tube is capable of enhancing the waterproof performance to a high extent at the obliquely cut portion and the slit portion and reinforces a portion of the drain wire led out from the cut position of the shielded wire. Thereby it is possible to prevent the drain wire from buckling when the drain wire is connected to a connector or the like.
- There is provided a fourth method for stopping water from penetrating into a drain wire contained in a shielded wire, including the steps of stripping a necessary length of a sheath of the shielded wire from a front end of the sheath, and leading out an insulated coated electric wire serving as a core electric wire and a drain wire in contact with a shielding material made of a metal braid or a metal foil; inserting the drain wire led out through a heat shrinkable tube; heating one portion of the heat shrinkable tube surrounding a front side of the drain wire to shrink the heat shrinkable tube without heating other portion of the heat shrinkable tube disposed at a side of the shielded wire opposite to the front side of the drain wire to form the other portion as a water-stopping agent-receiving portion with a gap held between the drain wire and the other portion of the heat shrinkable tube, and dripping a water-stopping agent to an opening of the water-stopping agent-receiving portion with an open side of the water-stopping agent-receiving portion located as an upper side of the heat shrinkable tube; and filling the dripped water-stopping agent throughout a whole length of the drain wire and the heat shrinkable tube, and thereafter heating the unheated side of the heat shrinkable tube for shrinkage.
- It is preferable that the portion of the heat shrinkable tube to be initially heated for shrinkage has a length about ⅔ of the entire length thereof. This is because as the portion to be initially heated for shrinkage becomes long, the water-stopping agent penetrates into the strands of the drain wire not in its longitudinal direction, but between the strands of the drain wire sufficiently in the water-stopping agent-receiving portion. Thus the water-stopping method has an improved water-stopping performance. In this case, the water-stopping agent-receiving portion having about ⅓ of the entire length of the heat shrinkable tube has the shape of a deep saucer. By providing the heat shrinkable tube with the saucer-shaped water-stopping agent-receiving portion, the water-stopping agent-receiving portion is capable of receiving the water-stopping agent without overflowing it when a predetermined amount of the water-stopping agent which penetrates into the entire length of the drain wire is dripped from above.
- In the fourth method, after the water-stopping agent-receiving portion is heated for shrinkage and thus the whole length of the heat shrinkable tube shrink to form the drain wire as the pseudo coated electric wire, the rubber stopper is mounted on the heat shrinkable tube by fitting the rubber stopper on the heat shrinkable tube. Thereafter the terminal is mounted at the front end of the drain wire by solderless connection. Thereafter the rubber stopper is moved between the terminal and the drain wire.
- There is provided a fifth method for stopping water from penetrating into a drain wire contained in a shielded wire, including the steps of stripping a necessary length of a sheath of the shielded wire from a front end of the sheath, and leading out an insulated coated electric wire serving as a core electric wire and a drain wire in contact with a shielding material made of a metal braid or a metal foil; inserting the drain wire into a heat shrinkable tube having an opening formed by cutting out a necessary portion thereof and exposing the drain wire from the opening; dripping a water-stopping agent to the opening and placing the water-stopping agent therein, and in the state, heating the heat shrinkable tube for shrinkage; and covering the opening with a waterproof heat shrinkable tube and heating the waterproof heat shrinkable tube for shrinkage.
- As the fifth method, there is also provided a method for stopping water from penetrating into a drain wire contained in a shielded wire, including the steps of stripping a necessary length of a sheath of the shielded wire from a front end of the sheath, and leading out an insulated coated electric wire serving as a core electric wire and a drain wire in contact with a shielding material made of a metal braid or a metal foil; inserting the drain wire into a rubber tube having an opening formed by cutting out a necessary portion thereof and exposing the drain wire from the opening; dripping a water-stopping agent to the opening and placing the water-stopping agent therein; and covering the opening with a waterproof heat shrinkable tube and heating the waterproof heat shrinkable tube for shrinkage.
- In the fifth method, a necessary portion of the heat shrinkable tube or the rubber tube is cut out to form the opening. Therefore by disposing the heat shrinkable tube or the rubber tube horizontally with the opening thereof located as its upper side, the dripped water-stopping agent can be received at the opening, and the water-stopping agent can be penetrated between the strands of the drain wire.
- Unlike the first method, the fifth method eliminates the need for the operation of sucking air, thus eliminating the use of an air sucking means and shortening an operation period of time. Further because the water-stopping agent is dripped to the opening and held therein, it is possible to quantitatively manage the water-stopping agent. In addition, by covering the drain wire with the waterproof heat shrinkable tube and heating it for shrinkage after the water-stopping agent is dripped to the heat shrinkable tube or the rubber tube, the water-stopping agent can be securely penetrated between the strands of the drain wire and into the periphery thereof.
- There is provided a sixth method for stopping water from penetrating into a drain wire contained in a shielded wire, including the steps of stripping a necessary length of a sheath of the shielded wire from a front end of the sheath, cutting out a cut position of the shielded wire to form a slit, leading out an insulated coated electric wire serving as a core electric wire from the cut position, and leading out a drain wire in contact with a shielding material made of a metal braid or a metal foil; inserting the drain wire led out through a non-waterproof heat shrinkable tube and heating the non-waterproof heat shrinkable tube for shrinkage or inserting the drain wire led out through a rubber tube; dripping a water-stopping agent to the slit and placing the water-stopping agent therein; and heating a waterproof heat shrinkable tube whose one side covers an end portion of the non-waterproof heat shrinkable tube or the rubber tube at a side of the shielded wire and whose other side covers the slit of the sheath.
- In the sixth method, the slit is formed at the cut position of the sheath. Thus by horizontally disposing the heat shrinkable tube with the slit located as the upper surface thereof, the dripped water-stopping agent can be received by the lower surface thereof confronting the slit and can be penetrated between the strands of the drain wire. In addition, after the water-stopping agent is dripped, the waterproof heat shrinkable tube covering the drain wire is heated for shrinkage. Therefore the water-stopping agent can be securely penetrated between the strands of the drain wire and into the periphery thereof.
- Unlike the first method, the sixth method eliminates the need for the operation of sucking air, thus eliminating the use of an air sucking means and shortening an operation period of time. Furthermore because the water-stopping agent is dripped to the slit and held therein, it is possible to quantitatively manage the water-stopping agent.
- It is preferable that the rubber tubes which are used in the first through third methods and the fifth and sixth methods are made of a material containing silicone or EPDM (ethylene-propylene rubber).
- As described above, in the present invention, the drain wire is covered with the heat shrinkable tube or the rubber tube, and the water-stopping agent is filled inside the heat shrinkable tube or the rubber tube. Therefore it is possible to accomplish the water-stopping processing by forming the drain wire as the pseudo coated electric wire and prevent a wire harness from becoming large by making the water-stopping processing portion slim.
- Further unlike conventional water-stopping processing of splicing the insulated coated electric wire and the drain wire with each other and molding the spliced portion with silicone or the like, the present invention is capable of decreasing the number of work steps and the number of component parts. Further it is unnecessary to strip the shielded wire from the end thereof in the length (not less than 150 mm) required to perform the splicing processing, but a minimum length is sufficient for connecting the terminal to the end of the drain wire by solderless connection. Consequently it is possible to restrain the shielded wire from decreasing its shielding performance.
-
FIG. 1 shows an entire shielded wire in which water-stopping processing for a drain wire has been performed in a first embodiment of the present invention. -
FIG. 2 is a perspective view of the shielded wire. -
FIGS. 3(A) and 3(B) are enlarged sectional views of the drain wire for which water-stopping processing has been performed. -
FIGS. 4(A) , 4(B), and 4(C) show a first method for water-stopping the drain wire. -
FIG. 5 shows a second method for water-stopping the drain wire. -
FIG. 6 shows a third method for water-stopping the drain wire. -
FIGS. 7(A) and 7(B) show a first modification example of the third method for water-stopping the drain wire. -
FIGS. 8(A) and 8(B) show a second modification example of the third method for water-stopping the drain wire. -
FIGS. 9(A) , 9(B), and 9(C) show a fourth method for water-stopping the drain wire. -
FIGS. 10(A) and 10(B) show a fifth method for water-stopping the drain wire. -
FIG. 11 shows a second embodiment of the present invention. -
FIG. 12 shows a method for water-stopping a drain wire in the second embodiment of the present invention. -
FIG. 13 shows a third embodiment of the present invention. -
FIGS. 14(A) and 14(B) show a method (sixth method for water-stopping the drain wire) for water-stopping a drain wire in the third embodiment of the present invention. -
FIGS. 15(A) and 15(B) show a conventional art. -
FIG. 16 shows another conventional art. -
- 10: shielded wire
- 11: drain wire
- 12: insulated coated electric wire (core wire)
- 13: shielded layer
- 14: sheath
- 15: heat shrinkable tube
- 16: water-stopping agent (silicone)
- 20: terminal
- 21: rubber stopper
- 40: jig
- 40 a: horizontal placing surface
- 40 b: inclined surface
- 50: rubber tube
- The embodiments of the present invention are described below with reference to the drawings.
-
FIG. 1 shows a shieldedwire 10 of the first embodiment. The shieldedwire 10 is disposed in a waterproof region of a car such as an engine room. An end of the shieldedwire 10 is connected with aconnector 30. Theconnector 30 is fitted in a connector accommodation portion of an ECU (not shown) disposed in the waterproof region. - Water-stopping processing is performed for a portion of a drain wire led out from a cut position of the stripped shielded
wire 10. - As shown in
FIG. 2 , the shieldedwire 10 contains two insulated coated electric wires 12 (hereinafter referred to as core wire 12) constituting signal wires and adrain wire 11. Thedrain wire 11 and thecore wires 12 are sequentially covered with a shieldedlayer 13 and asheath 14. Thedrain wire 11 is brought into contact with the shieldedlayer 13 to electrically connect thedrain wire 11 and the shieldedlayer 13 with each other. - The
sheath 14 and the shieldedlayer 13 are cut and stripped in a minimum length L of about 40 mm from a front end of the shieldedwire 10 to lead out thedrain wire 11 and thecore wire 12 from the shieldedwire 10. Therebyterminals 20 which are to be inserted into and locked to theconnector 30 are connected to a front end of each of thecore wire 12 and thedrain wire 11 by solderless connection. - As shown in
FIG. 3 , water-stopping processing is performed by inserting thedrain wire 11 led out from the end of the shieldedwire 10 into aheat shrinkable tube 15 and filling a water-stoppingagent 16 inside theheat shrinkable tube 15. - A
rubber stopper 21 is mounted at a boundary portion between a front end of theheat shrinkable tube 15 and a portion of thedrain wire 11 where the terminal 20 is mounted by solderless connection. Therubber stopper 21 is also mounted at a boundary portion between each of thecore wires 12 and each terminal 20. - A first method for stopping the penetration of water into the
drain wire 11 with which the above-described water-stopping construction is provided is described below. - Initially as described above, the
sheath 14 and the shieldedlayer 13 made of a metal braid are cut in a minimum length L from the front end of the shieldedwire 10 to strip thesheath 14 and the shieldedlayer 13 so that thecore wire 12 and thedrain wire 11 are exposed to the outside from a cut position of the shieldedwire 10. - Thereafter as shown in
FIG. 4(A) , after thedrain wire 11 is covered with theheat shrinkable tube 15 consisting of an insulating resin, theheat shrinkable tube 15 is heated to shrink it. Thereby thedrain wire 11 is covered with theheat shrinkable tube 15, with theheat shrinkable tube 15 in close contact with almost the entire length of the periphery of thedrain wire 11. - Thereafter as shown in
FIG. 4(B) , the water-stoppingagent 16 consisting of silicone is dripped to thedrain wire 11 exposed in a gap between a rear end of theheat shrinkable tube 15 and the cut position of thesheath 14 in such a way that anopening 15 a at the rear end of theheat shrinkable tube 15 is closed. As shown inFIG. 4(C) , simultaneously with the dripping or immediately after the dripping, ahose 17 is connected with the front end of thedrain wire 11 with thehose 17 covering anopening 15 b at the front end of theheat shrinkable tube 15, whereas the other end of thehose 17 is connected with a suction port of asuction pump 18. Thesuction pump 18 is driven to suck air inside theheat shrinkable tube 15 so that the pressure inside theheat shrinkable tube 15 is decreased. - Owing to the pressure decrease, the water-stopping
agent 16 is sucked into theheat shrinkable tube 15 from the opening 15 a disposed at the rear end thereof to penetrate the water-stoppingagent 16 between strands of thedrain wire 11 and is hardened with the passage of time. - After the water-stopping processing finishes, the
rubber stopper 21 for water-stopping use is mounted on thedrain wire 11 at the front end thereof, and therubber stopper 21 is temporarily fixed to the peripheral surface of the front end of theheat shrinkable tube 15. In this state, thedrain wire 11 is projected beyond the front end of theheat shrinkable tube 15 in a dimension necessary for mounting the terminal 20 on the projected portion of the front end of thedrain wire 11 by solderless connection. - After the terminal 20 is mounted at the front end of the
drain wire 11 by solderless connection, therubber stopper 21 is moved to a position where therubber stopper 21 covers the terminal 20. In this state, the other side of therubber stopper 21 is located as a position where therubber stopper 21 covers the peripheral surface of the front side of theheat shrinkable tube 15, thus covering the boundary portion between the portion of thedrain wire 11 where the terminal is mounted by solderless connection and theheat shrinkable tube 15. - The other end of the
heat shrinkable tube 15 is positioned at the cut position of the shieldedwire 10. The heat shrinkabletube 15 completely covers thedrain wire 11 to form thedrain wire 11 as a pseudo coated electric wire. - Even though there is a slight gap between the rear end of the
heat shrinkable tube 15 and the end of the shieldedwire 10, as described above, the water-stoppingagent 16 is supplied to the gap to cover the surface of the rear end of theheat shrinkable tube 15 and the front end of the shieldedwire 10 with the water-stoppingagent 16 in a molded state. Thus it is possible to prevent water from penetrating into thedrain wire 11 from the gap. - As shown in
FIG. 1 , the terminal 20 is mounted at the front end of each of the twocore wires 12 by solderless connection, and in a method similar to that carried out for thedrain wire 11, therubber stopper 21 is mounted at the front end of each of the twocore wires 12. - As described above, the water-stopping processing is performed by covering the
drain wire 11 projected in exposure beyond thesheath 14 of the shieldedwire 10 with theheat shrinkable tube 15 and filling the water-stoppingagent 16 consisting of the silicone in theheat shrinkable tube 15. - Therefore even though water penetrates into the
heat shrinkable tube 15 from openings disposed at both ends thereof, the penetration of the water can be prevented by the water-stoppingagent 16 filled inside theheat shrinkable tube 15. As described above, even though there is a gap between the rear end of theheat shrinkable tube 15 and the end of the shieldedwire 10 and thedrain wire 11 is exposed to the outside, it is possible to prevent the water from penetrating between into thedrain wire 11 because thedrain wire 11 is molded with the water-stopping agent consisting of the silicone. - Because the boundary portion between the front end of the
heat shrinkable tube 15 and the terminal 20 is covered with therubber stopper 21, it is possible to prevent the penetration of the water into theheat shrinkable tube 15 from the front end thereof. - Further there is provided a water-stopping construction of sucking air inside the
heat shrinkable tube 15 to fill the water-stoppingagent 16 between the strands of thedrain wire 11. Thus a portion to be water-stopped does not have a large diameter and is allowed to be smaller than a conventional portion to be water-stopped. - Further by covering the
drain wire 11 with theheat shrinkable tube 15 to form thedrain wire 11 as the pseudo electric wire, it is unnecessary to splice thedrain wire 11 and the insulated coated electric wire with each other. Therefore it is possible to decrease a material cost and a processing expenditure and set the stripping length L of the sheath of the shieldedwire 10 to 40 mm which is the length necessary for mounting the terminal on thedrain wire 11 by solderless connection. By minimizing the stripping length L, it is possible to greatly restrain the shieldedwire 10 from deteriorating in the shielding performance thereof. -
FIG. 5 shows a second method for stopping the penetration of water into thedrain wire 11. - In the second method, before the
drain wire 11 exposed to the outside from the cut position of the shieldedwire 10 is covered with theheat shrinkable tube 15, the water-stopping agent (silicone) 16 is dripped from above to an intermediate position of thedrain wire 11 in its longitudinal direction. The dripped water-stoppingagent 16 can be penetrated between the strands of thedrain wire 11 owing to its flowability. In this manner, the water-stoppingagent 16 can be penetrated into the strands of the exposeddrain wire 11 over the whole length thereof. The state of the penetration of the water-stoppingagent 16 into the strands of thedrain wire 11 can be inspected visually because thedrain wire 11 is not covered with theheat shrinkable tube 15. - Thereafter the
drain wire 11 is covered with theheat shrinkable tube 15 from the front end thereof. After thedrain wire 11 is covered with theheat shrinkable tube 15 over the whole length thereof from the front end thereof to the cut position of the shieldedwire 10, theheat shrinkable tube 15 is heated to shrink it. Thereafter theheat shrinkable tube 15 is brought into close contact with the peripheral surface of thedrain wire 11 in which the water-stopping agent has penetrated between the strands. - At subsequent steps similar to the first method, the rubber stopper is mounted at the predetermined portion, and the terminal is mounted at the front end of the
drain wire 11 by solderless connection. - The
drain wire 11 for which the water-stopping processing has been performed by the second method is similar to that for which the water-stopping processing has been performed by the first method and has a construction, shown inFIGS. 1 through 3 , which allows a slim portion to be water-stopped to be formed on thedrain wire 11. Thus the second method has the same operation and effect as those of the first method. - Instead of dripping the water-stopping
agent 16 to thedrain wire 11 at the intermediate portion thereof, the water-stoppingagent 16 may be applied thereto along the peripheral surface thereof. -
FIG. 6 shows a third method for stopping the penetration of water into the drain wire. - In the third method, a water-stopping agent-receiving
portion 15 c is formed by obliquely cutting theheat shrinkable tube 15 at the front end of theheat shrinkable tube 15 covering the shieldedwire 10. The front end of theheat shrinkable tube 15 is disposed at the cut position of the shieldedwire 10. - The
drain wire 11 is covered with theheat shrinkable tube 15 from the water-stopping agent-receivingportion 15 c formed by obliquely cutting theheat shrinkable tube 15. The movement of theheat shrinkable tube 15 is stopped at a midway position before the water-stopping agent-receivingportion 15 c disposed at the front end of theheat shrinkable tube 15 reaches the cut position. Thereafter the water-stoppingagent 16 made of silicone is dripped from above and received by the water-stopping agent-receivingportion 15 c held horizontally with a cut side thereof located as its upper side. The dripped water-stopping agent penetrates into the front end of thedrain wire 11 covered with theheat shrinkable tube 15. - After a predetermined amount of the water-stopping
agent 16 is dripped, theheat shrinkable tube 15 is moved to the cut position of the shieldedwire 10 with thedrain wire 11 covered with theheat shrinkable tube 15. At this time, the peripheral surface of thedrain wire 11 being inserted into theheat shrinkable tube 15 contacts the water-stoppingagent 16 held by the water-stopping agent-receivingportion 15 c, with the water-stoppingagent 16 penetrating between the strands of thedrain wire 11. - In the above-described step, the operation of inserting the
drain wire 11 through theheat shrinkable tube 15 and the operation of penetrating the water-stoppingagent 16 between the strands of thedrain wire 11 are simultaneously performed. When thedrain wire 11 is covered with theheat shrinkable tube 15 to the cut position of the shieldedwire 10, the water-stoppingagent 16 penetrates between the strands of thedrain wire 11 over the whole length thereof. - Thereafter the
heat shrinkable tube 15 is heated to shrink it and brought into close contact with the peripheral surface of thedrain wire 11 in which the water-stoppingagent 16 has penetrated between the strands. - Similarly to the first and second methods, after the
rubber stopper 21 is mounted on thedrain wire 11, the terminal 20 is mounted on the end of thedrain wire 11 projected beyond the front end of theheat shrinkable tube 15 by solderless connection. After the solderless connection of the terminal finishes, therubber stopper 21 is moved to a boundary position between the terminal and theheat shrinkable tube 15 to cover the boundary position with therubber stopper 21. - The
drain wire 11 for which the water-stopping processing has been performed by the third method is similar to that for which the water-stopping processing has been performed by the first and second methods and has a construction, shown inFIGS. 1 through 3 , which allows a slim portion to be water-stopped to be formed on thedrain wire 11. Thus the third method has the same operation and effect as those of the first and second methods. - Further, similarly to the second method, it is unnecessary to suck air at the time of the filling of the water-stopping agent and thus it is possible to decrease an operation period of time. Furthermore because the dripped water-stopping agent is received by the water-stopping agent-receiving portion formed by obliquely cutting the
heat shrinkable tube 15, the dripped water-stopping agent does not drop, and the amount of the dripped water-stopping agent can be restricted to an amount which can be received by the water-stopping agent-receivingportion 15 c. That is, by adjusting a dimension of the water-stopping agent-receiving portion to be formed by obliquely cutting theheat shrinkable tube 15, it is possible to quantitatively manage the water-stopping agent. -
FIG. 7 shows a first modification example of the third method for stopping the penetration of water into the drain wire. - In the first modification example of the third method, a
jig 40 having ahorizontal placing surface 40 a and aninclined surface 40 b inclined downward from a side edge of thehorizontal placing surface 40 a is used. The inclination of theinclined surface 40 b is set to 45 degrees to a horizontal surface. At a lower position of theinclined surface 40 b, there is provided a holdingplate 40 c for holding theheat shrinkable tube 15 on theinclined surface 40 b with the holdingplate 40 c in contact with anend 15 d of theheat shrinkable tube 15 disposed at a side opposite to the position of the water-stopping agent-receivingportion 15 c. - The shielded
wire 10 is disposed on thehorizontal placing surface 40 a of thejig 40. The heat shrinkabletube 15 covering thedrain wire 11 is disposed on theinclined surface 40 b by holding theheat shrinkable tube 15 by the holdingplate 40 c with the water-stopping agent-receivingportion 15 c of theheat shrinkable tube 15, formed by obliquely cutting theheat shrinkable tube 15, located at a higher position of theinclined surface 40 b. At this time, the cut side of the water-stopping agent-receivingportion 15 c is located as the upper side thereof. The heat shrinkabletube 15 has the same configuration as that used in the third method and consists of a non-waterproof heat shrinkable tube whose inner surface is not provided with the water-stopping agent. - The water-stopping
agent 16 is dripped from above to the water-stopping agent-receivingportion 15 c of theheat shrinkable tube 15 disposed on theinclined surface 40 b of thejig 40 and received by the water-stopping agent-receivingportion 15 c. Along theinclined surface 40 b, the dripped water-stopping agent penetrates into the front end of thedrain wire 11 covered with theheat shrinkable tube 15. - After a predetermined amount of the water-stopping
agent 16 is dripped, theheat shrinkable tube 15 is moved to the cut position of the shieldedwire 10 with thedrain wire 11 covered with theheat shrinkable tube 15. At this time, the peripheral surface of thedrain wire 11 being gradually inserted into theheat shrinkable tube 15 contacts the water-stoppingagent 16 held by the water-stopping agent-receivingportion 15 c, with the water-stoppingagent 16 penetrating between the strands of thedrain wire 11. - Thereafter the shielded
wire 10 is removed from thejig 40. In a range from the water-stopping agent-receivingportion 15 c of theheat shrinkable tube 15 to the cut position of the shieldedwire 10, theheat shrinkable tube 15 is covered with a waterproof heatshrinkable tube 41 whose inner surface is provided with a water-stoppingagent 41 a. That is, one side of the waterproof heatshrinkable tube 41 covers the water-stopping agent-receivingportion 15 c of theheat shrinkable tube 15, whereas the other side of the waterproof heatshrinkable tube 41 is in contact with the cut position of the shieldedwire 10. In this state, theheat shrinkable tube 15 and the waterproof heatshrinkable tube 41 are heated to shrink them so that theheat shrinkable tube 15 and the waterproof heatshrinkable tube 41 closely contact the peripheral surface of thedrain wire 11. - Similarly to the first and second methods, after the
rubber stopper 21 is mounted on thedrain wire 11, the terminal 20 is mounted on the end of thedrain wire 11 projected beyond the front end of theheat shrinkable tube 15 by solderless connection. - The
drain wire 11 for which the water-stopping processing has been performed by the first modification example of the third method is similar to that for which the water-stopping processing has been performed by the third method and has a construction which allows a slim portion to be water-stopped to be formed on thedrain wire 11. Thus the first modification example of the third method has the same operation and effect as those of the third method. - Because the
heat shrinkable tube 15 covering thedrain wire 11 is disposed on theinclined surface 40 b of thejig 40, the water-stoppingagent 16 which has dripped to the water-stopping agent-receivingportion 15 c of theheat shrinkable tube 15 flows along the slope and easily penetrates between the strands of thedrain wire 11. - Other methods and operations and effects of the first modification example of the third method are similar to those of the third method. Thus the same parts of the first modification example as those of the third method are denoted by the same reference numerals as those of the third method, and description thereof is omitted herein.
-
FIG. 8 shows a second modification example of the third method for stopping the penetration of water into the drain wire. - In the method of the second modification example, at the front end of the
heat shrinkable tube 15 disposed at the cut position of the shieldedwire 10, there is formed the water-stopping agent-receivingportion 15 c having atriangular slit 15 e extended in a longitudinal direction of theheat shrinkable tube 15 covering the shieldedwire 10. - The
drain wire 11 is covered with theheat shrinkable tube 15 from the water-stopping agent-receivingportion 15 c having the slit formed therethrough. The movement of theheat shrinkable tube 15 is stopped at a midway position before the water-stopping agent-receivingportion 15 c reaches the cut position. Thereafter the water-stopping agent-receivingportion 15 c disposed at the front end of theheat shrinkable tube 15 is held horizontally with theslit 15 e located as the upper side thereof. In this state, the water-stoppingagent 16 is dripped from above and received by the water-stopping agent-receivingportion 15 c. The dripped water-stopping agent penetrates into the front end of thedrain wire 11 covered with theheat shrinkable tube 15. - After a predetermined amount of the water-stopping
agent 16 is dripped, theheat shrinkable tube 15 is moved to the cut position of the shieldedwire 10 with thedrain wire 11 covered with theheat shrinkable tube 15. At this time, the peripheral surface of thedrain wire 11 being gradually inserted into theheat shrinkable tube 15 contacts the water-stoppingagent 16 held by the water-stopping agent-receivingportion 15 c, with the water-stoppingagent 16 penetrating between the strands of thedrain wire 11. - In the above-described step, the operation of inserting the
drain wire 11 through theheat shrinkable tube 15 and the operation of penetrating the water-stoppingagent 16 between the strands of thedrain wire 11 are simultaneously performed. When thedrain wire 11 is covered with theheat shrinkable tube 15 to the cut position of the shieldedwire 10, the water-stoppingagent 16 penetrates between the strands of thedrain wire 11 over the whole length thereof. - Thereafter in the range from the water-stopping agent-receiving
portion 15 c of theheat shrinkable tube 15 to the cut position of the shieldedwire 10, theheat shrinkable tube 15 is covered with the waterproof heatshrinkable tube 41 whose inner surface is provided with the water-stoppingagent 41 a. That is, one side of the waterproof heatshrinkable tube 41 covers theentire slit 15 e of theheat shrinkable tube 15, whereas the other end thereof is in contact with the cut position of the shieldedwire 10. In this state, theheat shrinkable tube 15 and the waterproof heatshrinkable tube 41 are heated to shrink them so that theheat shrinkable tube 15 and the waterproof heatshrinkable tube 41 closely contact the peripheral surface of thedrain wire 11. - In a method similar to that of the first and second methods, after the
rubber stopper 21 is mounted on thedrain wire 11, the terminal 20 is mounted on the end of thedrain wire 11 projected beyond the front end of theheat shrinkable tube 15 by solderless connection. - The
drain wire 11 for which the water-stopping processing has been performed by the second modification example of the third method is similar to that for which the water-stopping processing has been performed by the third method and has a construction which allows a slim portion to be water-stopped to be formed on thedrain wire 11. The second modification example of the third method has the same operation and effect as those of the third method. - Because the
slit 15 e is formed at the front end of theheat shrinkable tube 15 at the drain wire insertion side thereof, thedrain wire 11 can be easily inserted into theheat shrinkable tube 15. - Other methods and operations and effects of the second modification example of the third method are similar to those of the third method. Thus the same parts of the second modification example as those of the third method are denoted by the same reference numerals as those of the third method, and description thereof is omitted herein.
- In the third method, after the
heat shrinkable tube 15 covers thedrain wire 11 halfway and the water-stoppingagent 16 is dripped, theheat shrinkable tube 15 is moved to the cut position of the shieldedwire 10. But it is possible to adopt a method of moving theheat shrinkable tube 15 to a predetermined position and not moving theheat shrinkable tube 15 after the water-stoppingagent 16 is dripped. -
FIG. 9 shows a fourth method for stopping the penetration of water into the drain wire. - Initially the
drain wire 11 led out from the cut position of the shieldedwire 10 is covered with theheat shrinkable tube 15 from the front end of thedrain wire 11. - A
portion 15 x having a length about the half of the length of theheat shrinkable tube 15 from the front end thereof disposed at the side of thedrain wire 11 is heated to shrink theportion 15 x and brought into close contact with the peripheral surface of thedrain wire 11. In this state, as shown inFIG. 9(A) , the remaining half of theheat shrinkable tube 15, disposed at the side of the cut position, which has not been heated for shrinkage has a gap between the remaining half of theheat shrinkable tube 15 and the peripheral surface of thedrain wire 11. The side of theheat shrinkable tube 15 confronting the cut position is formed as an open end of theheat shrinkable tube 15 having the gap. That is, the remaining half of the length of theheat shrinkable tube 15 has the shape of a deep dish and is denoted as a water-stopping agent-receivingportion 15 y. - Thereafter the
heat shrinkable tube 15 is disposed vertically with theopen end 15 y-1 of the water-stopping agent-receivingportion 15 y disposed uppermost. As shown inFIG. 9(B) , with the uppermost disposedopen end 15 y-1 spaced at a certain interval from the cut position disposed above theopen end 15 y-1, the water-stoppingagent 16 is dripped from above. - The dripped water-stopping
agent 16 drops into theportion 15 x which has been heated for shrinkage by gravity and penetrates between the strands of thedrain wire 11 inserted into theportion 15 x. In addition, the dripped water-stoppingagent 16 also penetrates between the strands of a portion of thedrain wire 11 inserted into the water-stopping agent-receivingportion 15 y. By dripping a predetermined amount of the water-stoppingagent 16 into the water-stopping agent-receivingportion 15 y, the water-stoppingagent 16 penetrates between the strands of thedrain wire 11 over the whole length thereof. - After the predetermined amount of the water-stopping
agent 16 is dripped, theopen end 15 y-1 of theheat shrinkable tube 15 is lifted to bring theopen end 15 y-1 into contact with the cut position of the shieldedwire 10 so that the water-stoppingagent 16 penetrates between the strands of thedrain wire 11 over the whole the length thereof. - Thereafter the water-stopping agent-receiving
portion 15 y which has not been heated is heated to shrink it and brought into close contact with the peripheral surface of thedrain wire 11. - Similarly to the first and second methods, after the
rubber stopper 21 is mounted on thedrain wire 11, the terminal 20 is mounted on the end of thedrain wire 11 projected beyond the front end of theheat shrinkable tube 15 by solderless connection. After the solderless connection of the terminal 20 finishes, therubber stopper 21 is moved to the boundary position between the terminal 20 and theheat shrinkable tube 15 so that therubber stopper 21 covers the boundary position. - Similarly to the
drain wire 11 for which the water-stopping processing has been performed by the first and second methods, thedrain wire 11 for which the water-stopping processing has been performed by the fourth method has a construction, shown inFIGS. 1 through 3 , which allows a slim portion to be water-stopped to be formed on thedrain wire 11. Thus the fourth method has the same operation and effect as those of the first and second methods. - Further unlike in the third method, in the fourth method, the water-stopping agent-receiving portion can be formed without obliquely cutting the heat shrinkable tube. In addition, because the water-stopping agent-receiving portion has the shape of a deep dish, the water-stopping agent-receiving portion is capable of securely receiving the water-stopping agent dripped from above without overflowing the water-stopping agent. Furthermore by appropriately adjusting the length of the front side of the heat shrinkable tube to be heated for shrinkage and the length of the water-stopping agent-receiving portion thereof not heated, it is possible to manage the amount of the water-stopping agent to be dripped.
- In the fourth method, the portion of the heat shrinkable tube having a length about the half of the length of the
heat shrinkable tube 15 is heated for shrinkage, and the portion having about the remaining half of the length thereof is formed as the water-stopping agent-receiving portion. But even though the portion of the heat shrinkable tube having a length about ⅔ of the length thereof is heated for shrinkage and even though the portion having a length about ⅓ of the length thereof is formed as the water-stopping agent-receiving portion, it is possible to form a preferable portion to be water-stopped. - In the fourth method, the portion to be water-stopped is formed by setting the longitudinal direction of the
heat shrinkable tube 15 to a vertical direction. But the portion to be water-stopped may be formed by carrying out the fourth method in a state where theheat shrinkable tube 15 is placed on theinclined surface 40 b of thejig 40 used in the first modification of the third method. -
FIG. 10 shows a fifth method for stopping the penetration of water into thedrain wire 11. - In the fifth method, the
heat shrinkable tube 15 which covers thedrain wire 11 is cut out at a midway position to form anopening 15 d. - As shown in
FIG. 10(A) , theheat shrinkable tube 15 is moved to cover thedrain wire 11 till theheat shrinkable tube 15 reaches the cut position. The water-stoppingagent 16 made of silicone is dripped from above to theopening 15 d disposed at the upper side of theheat shrinkable tube 15 held horizontally and received by the periphery of theopening 15 d and a portion of theheat shrinkable tube 15 confronting theopening 15 d. The dripped water-stoppingagent 16 penetrates between the strands of thedrain wire 11 covered with theheat shrinkable tube 15. - After the predetermined amount of the water-stopping
agent 16 is dripped, theheat shrinkable tube 15 is heated to shrink it and brought into close contact with the peripheral surface of thedrain wire 11 in which the water-stoppingagent 16 has penetrated between the strands. - As shown in
FIG. 10(B) , after theheat shrinkable tube 15 is covered with a waterproof heatshrinkable tube 19 to cover the entire surface of theopening 15 d of theheat shrinkable tube 15, the waterproof heatshrinkable tube 19 is heated for shrinkage. At this time, theopening 15 d is covered with a water-stoppingagent 19 a provided on the inner peripheral surface of the waterproof heatshrinkable tube 19, and the water-stoppingagent 15 is filled between the peripheral surface of theheat shrinkable tube 15 and the inner peripheral surface of the waterproof heatshrinkable tube 19. - In a method similar to that of the second method, after the
rubber stopper 21 is mounted on the predetermined position, the terminal 20 is mounted on the end of thedrain wire 11 projected beyond the front end of theheat shrinkable tube 15 by solderless connection. - The
drain wire 11 waterproofed by the fifth method has a little larger diameter than the drain wire waterproofed by the above-described methods by the thickness of the waterproof heatshrinkable tube 19 mounted on theheat shrinkable tube 15. But owing to the use of the waterproof heatshrinkable tube 19, it is possible to securely prevent the penetration of water into theheat shrinkable tube 15 for which water-stopping processing has been performed from theopening 15 d and in addition keep the terminal connected to the front end of the drain wire straight in inserting the terminal into a connector to connect the terminal to a mating terminal. Therefore a connector connection work can be facilitated. - Similarly to the second method, at the time of the filling of the water-stopping agent, it is unnecessary to suck air and thus it is possible to decrease an operation period of time. Further because the dripped water-stopping agent is received by the periphery of the opening of the heat shrinkable tube, the dripped water-stopping agent does not drop, and the amount of the dripped water-stopping agent can be restricted to the amount which can be received by the periphery of the opening.
- In the fifth method, the waterproof heat
shrinkable tube 19 is directly mounted on theopening 15 d of theheat shrinkable tube 15. But the waterproof heatshrinkable tube 19 may be mounted on theopening 15 d of theheat shrinkable tube 15, after a tape is wound around theopening 15 d to prevent the water-stopping agent from overflowing. -
FIGS. 11 and 12 show the second embodiment of the present invention. - In the second embodiment, water-stopping processing is performed by mounting a
rubber tube 50 containing silicone or EPDM (ethylene-propylene rubber) on thedrain wire 11 led out from the end of the shieldedwire 10 instead of the heat shrinkable tube and filling the water-stoppingagent 16 inside therubber tube 50. - A
rubber stopper 50 a having a configuration approximately the same as that of the rubber stopper of the first embodiment is formed integrally with a front end of therubber tube 50 positioned at the end of thedrain wire 11. Onebarrel 20 a of the terminal 20 is mounted on the end of thedrain wire 11 by solderless connection, whereasother barrel 20 b thereof is mounted on therubber stopper 50 a of therubber tube 50 by solderless connection. - A gap is formed between the other end of the
rubber tube 50 and the cut position of the shieldedwire 10. A tape 51 is wound around therubber tube 50 in the range from the other end thereof to the cut position of the shieldedwire 10. - Next, a method for stopping the penetration of water into the
drain wire 11 having the above-described construction is described below. - Before the
rubber tube 50 is mounted on thedrain wire 11 exposed to the outside from the cut position of the shieldedwire 10, the water-stopping agent (silicone) 16 is dripped to thedrain wire 11 from above at an intermediate position thereof in its longitudinal direction. - Thereafter the
rubber tube 50 is mounted on thedrain wire 11 from the front end thereof. After a portion where the water-stoppingagent 16 is dripped is covered with therubber tube 50, the terminal 20 is mounted at the front end of therubber tube 50 by solderless connection, and the tape 51 is wound round the other side of therubber tube 50. - In the second embodiment, the tape 51 is wound round the other side of the
rubber tube 50. But the other side of therubber tube 50 may be covered with a waterproof heat shrinkable tube. - In the above-described construction, similarly to the first embodiment, the second embodiment has the construction which allows the drain wire to be provided with a slim portion to be water-stopped. Thus the second method has the same operation and effect as those of the first method. Further the second embodiment eliminates the need for the provision of the step of heating the heat shrinkable tube and allows the terminal to be directly mounted on the end of the
rubber tube 50 by solderless connection, thus eliminating the need for the use of the rubber stopper and decreasing the number of parts and operation steps. - The water-stopping method of the second embodiment corresponds to the second water-stopping method of the first embodiment. By using the
rubber tube 50 as in the case of the second embodiment, it is possible to adopt a method (step of heating theheat shrinkable tube 15 for shrinkage is excluded) corresponding to the first, third or fifth water-stopping method of the first embodiment. - Other constructions and operations and effects of the second embodiment are similar to those of the first embodiment. Thus the same parts of the second embodiment as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted herein.
-
FIGS. 13 and 14 show the third embodiment of the present invention. - In the third embodiment, at the cut position of the shielded
wire 10, there is formed atriangular slit 14 a extended in the longitudinal direction of thesheath 14 by cut-out. Thedrain wire 11 is led out through theslit 14 a. Thedrain wire 11 is led out from theslit 14 a in a direction opposite to the position of the cut position of thesheath 14 and held at a narrow portion of theslit 14 a. Thedrain wire 11 led out is folded back to the cut position of thesheath 14 at a necessary portion. - The water-stopping
agent 16 is filled between the strands of thedrain wire 11 at a position where thedrain wire 11 is led out, whereas the non-waterproof heatshrinkable tube 15 is heated to shrink it with the front side of thedrain wire 11 covered with a non-waterproof heatshrinkable tube 15. Therubber stopper 21 is mounted at the front end of the non-waterproof heatshrinkable tube 15, and the terminal 20 is mounted on the end of thedrain wire 11 by solderless connection. - A portion of the
drain wire 11 exposed between thesheath 14 and the non-waterproof heatshrinkable tube 15 is covered with the waterproof heatshrinkable tube 19 and heated for shrinkage. The end portion of the non-waterproof heatshrinkable tube 15 at the shielded wire side is covered with one side of the waterproof heatshrinkable tube 19, whereas theslit 14 a of thesheath 14 is covered with the other side of the waterproof heatshrinkable tube 19. Thereby the periphery of the portion of thedrain wire 11 exposed to the outside between thesheath 14 and the non-waterproof heatshrinkable tube 15 is covered with the water-stoppingagent 19 a of the waterproof heatshrinkable tube 19. - Next, a method (sixth method) for stopping water from penetrating into the
drain wire 11 having the water-stopping construction is described below. - Initially as shown in
FIG. 14(A) , thecore wire 12 is led out from the end of thesheath 14, and thedrain wire 11 is led out through theslit 14 a formed at the cut position of thesheath 14. - Thereafter as shown in
FIG. 14(B) , the non-waterproof heatshrinkable tube 15 is mounted at the front side of thedrain wire 11 and heated to shrink it. - Thereafter the water-stopping
agent 16 is dripped to theslit 14 a and held therein, and the waterproof heatshrinkable tube 19 is mounted on thedrain wire 11 exposed between thesheath 14 and the non-waterproof heatshrinkable tube 15 and heated to shrink it. - Thereafter the
rubber stopper 21 is mounted at the front end of thedrain wire 11, and the terminal 20 is mounted thereon by solderless connection. - In the above-described construction, similarly to the first embodiment, the third embodiment has a construction which allows the drain wire to be provided with a slim portion to be water-stopped. Thus the third embodiment has the same operation and effect as those of the first embodiment. Further in the third embodiment, because it is unnecessary to suck air, it is unnecessary to provide an air-sucking means and possible to decrease an operation period of time. In addition, because the water-stopping
agent 16 is dripped to theslit 14 a of thesheath 14 and held therein, it is possible to quantitatively manage the water-stopping agent. - Instead of the non-waterproof heat shrinkable tube of the third embodiment, the rubber tube of the second embodiment may be used.
- Other constructions and operations and effects of the third embodiment are similar to those of the first embodiment. Thus the same parts of the third embodiment as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted herein.
Claims (11)
1. A wire harness comprising:
a drain wire having strands;
a shielded wire, formed of metal braid or metal foil, that contacts the drain wire;
an insulated coated electric wire serving as a core electric wire, the coated electric wire and the drain wire being disposed within the shielded wire;
a sheath surrounding the shielded wire and defining a front end, a length of the coated electric wire and the drain wire projecting from the front end;
a tube covering the length of the drain wire that projects from the front end of the sheath, the tube being formed from rubber or shrinkable material that shrinks when heated; and
a water-stopping agent that: 1) in a liquefied state is capable of being introduced into one end of the tube, by sucking air from another end of the tube, and thereby filling the tube including areas between the strands of the drain wire; and 2) in solid state is disposed within the tube and between the strands of the drain wire so as to impede water from penetrating into the drain wire.
2. A wire harness comprising:
a drain wire having strands;
a shielded wire, formed of metal braid or metal foil, that contacts the drain wire;
an insulated coated electric wire serving as a core electric wire, the coated electric wire and the drain wire being disposed within the shielded wire;
a sheath surrounding the shielded wire and defining a front end, a length of the coated electric wire and the drain wire projecting from the front end;
a tube covering the length of the drain wire that projects from the front end of the sheath, the tube being formed from rubber or shrinkable material that shrinks when heated; and
a water-stopping agent that: 1) in a liquefied state is capable of being dripped or applied to the length of the drain wire that projects from the front end of the sheath, penetrating between the strands of the drain wire, the drain wire being subsequently inserted through the tube; and 2) in a solid state is disposed within the tube and between the strands of the drain wire so as to impede water from penetrating into the drain wire.
3. A wire harness comprising:
a drain wire having strands;
a shielded wire, formed of metal braid or metal foil, that contacts the drain wire;
an insulated coated electric wire serving as a core electric wire, the coated electric wire and the drain wire being disposed within the shielded wire;
a sheath surrounding the shielded wire and defining a front end, a length of the coated electric wire and the drain wire projecting from the front end;
a tube having an obliquely cut portion or a slit portion formed by a cut-out at a front end thereof, and covering the length of the drain wire that projects from the front end of the sheath, the tube being formed from rubber or material that shrinks when heated, the drain wire being inserted through the tube; and
a water-stopping agent that: 1) in a liquefied state is capable of being dripped or applied onto the obliquely cut portion or the slit portion of the tube filling areas between the strands of the drain wire; and 2) in a solid state is disposed within the tube and between the strands of the drain wire so as to impede water from penetrating into the drain wire.
4. The wire harness, according to claim 1 , wherein a boundary portion between a terminal connected to an end of the drain wire and the heat shrinkable tube is covered with a rubber stopper.
5. The wire harness, according to claim 1 , wherein the tube is the rubber tube containing silicone or EPDM (ethylene-propylene rubber); and a terminal connected to an end of the drain wire is connected to a peripheral surface of the tube by solderless connection.
6. The wire harness, according to claim 1 , wherein the shielded wire is disposed in a waterproof region inside a vehicle; and both a terminal connected to an end of the drain wire and a terminal connected to an end of the coated electric wire that project from the front end of the sheath are connected to an appliance disposed inside the waterproof region.
7. The wire harness, according to claim 2 , wherein the shielded wire is disposed in a waterproof region inside a vehicle; and both a terminal connected to an end of the drain wire and a terminal connected to an end of the coated electric wire that project from the front end of the sheath are connected to an appliance disposed inside the waterproof region.
8. The wire harness, according to claim 3 , wherein the shielded wire is disposed in a waterproof region inside a vehicle; and both a terminal connected to an end of the drain wire and a terminal connected to an end of the coated electric wire that project from the front end of the sheath are connected to an appliance disposed inside the waterproof region.
9. A wire harness, having a construction for stopping water from penetrating into a drain wire contained in a shielded wire, which is produced by a process comprising:
stripping a necessary length of a sheath of the shielded wire from a front end of the sheath;
leading out an insulated coated electric wire serving as a core electric wire and a drain wire in contact with a shielding material made of a metal brain or a metal foil;
covering the drain wire led out with a heat shrinkable tube and heating the heat shrinkable tube or covering the drain wire led out with a rubber tube; and
while sucking air from one end of the heat shrinkable tube or the rubber tube, supplying a water-stopping agent into the heat shrinkable tube or the rubber tube from another end thereof to fill the water-stopping agent between strands of the drain wire contained inside the tube.
10. A wire harness, having a construction for stopping water from penetrating into a drain wire contained in a shielded wire, which is produced by a process comprising:
stripping a necessary length of a sheath of the shielded wire from a front end of the sheath;
leading out an insulated coated electric wire serving as a core electric wire and a drain wire in contact with a shielding material made of a metal brain or a metal foil;
dripping or applying a water-stopping agent to the drain wire led out to penetrate the water-stopping agent between strands of the drain wire; and
inserting the drain wire into which the water-stopping agent has penetrated through a heat shrinkable tube to cover the drain wire with the heat shrinkable tube and heating the heat shrinkable tube for shrinkage or inserting the drain wire into which the water-stopping agent has penetrated through a rubber tube to cover the drain wire with the rubber tube.
11. A wire harness, having a construction for stopping water from penetrating into a drain wire contained in a shielded wire, which is produced by a process comprising:
stripping a necessary length of a sheath of the shielded wire from a front end of the sheath;
leading out an insulated coated electric wire serving as a core electric wire and a drain wire in contact with a shielding material made of a metal braid or a metal foil;
inserting the drain wire into a heat shrinkable tube having an obliquely cut portion or a slit portion formed by a cut-out at a front end thereof;
dripping or applying a water-stopping agent to the obliquely cut portion or the slit portion and placing the water-stopping agent therein, and thereafter heating the heat shrinkable tube for shrinkage; and
filling the water-stopping agent between strands of the drain wire contained inside the tube.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/067,784 US20110272193A1 (en) | 2006-02-02 | 2011-06-27 | Construction for stopping water from penetrating into drain wire contained in shielded wire and method for stopping water from penetrating thereinto |
Applications Claiming Priority (13)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006026382 | 2006-02-02 | ||
JP2006-026382 | 2006-02-02 | ||
JP2006178651 | 2006-06-28 | ||
JP2006-178651 | 2006-06-28 | ||
JP2006-214588 | 2006-08-07 | ||
JP2006214588 | 2006-08-07 | ||
JP2006-260586 | 2006-09-26 | ||
JP2006260586 | 2006-09-26 | ||
JP2007-002370 | 2007-01-10 | ||
JP2007002370A JP5188713B2 (en) | 2006-02-02 | 2007-01-10 | Shielded wire with drain wire waterproof structure and drain wire waterproof method |
PCT/JP2007/051350 WO2007088798A1 (en) | 2006-02-02 | 2007-01-29 | Water-stop structure of drain wire in shielded wire and method for stopping water in the drain wire |
US22316908A | 2008-07-24 | 2008-07-24 | |
US13/067,784 US20110272193A1 (en) | 2006-02-02 | 2011-06-27 | Construction for stopping water from penetrating into drain wire contained in shielded wire and method for stopping water from penetrating thereinto |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2007/051350 Division WO2007088798A1 (en) | 2006-02-02 | 2007-01-29 | Water-stop structure of drain wire in shielded wire and method for stopping water in the drain wire |
US22316908A Division | 2006-02-02 | 2008-07-24 |
Publications (1)
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US20110272193A1 true US20110272193A1 (en) | 2011-11-10 |
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US12/223,169 Expired - Fee Related US8146248B2 (en) | 2006-02-02 | 2007-01-29 | Construction for stopping water from penetrating into drain wire contained in shielded wire and method for stopping water from penetrating thereinto |
US13/067,784 Abandoned US20110272193A1 (en) | 2006-02-02 | 2011-06-27 | Construction for stopping water from penetrating into drain wire contained in shielded wire and method for stopping water from penetrating thereinto |
Family Applications Before (1)
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US12/223,169 Expired - Fee Related US8146248B2 (en) | 2006-02-02 | 2007-01-29 | Construction for stopping water from penetrating into drain wire contained in shielded wire and method for stopping water from penetrating thereinto |
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US (2) | US8146248B2 (en) |
JP (1) | JP5188713B2 (en) |
CN (1) | CN101379570B (en) |
DE (1) | DE112007000295T5 (en) |
WO (1) | WO2007088798A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
US20090126993A1 (en) | 2009-05-21 |
US8146248B2 (en) | 2012-04-03 |
CN101379570A (en) | 2009-03-04 |
JP5188713B2 (en) | 2013-04-24 |
WO2007088798A1 (en) | 2007-08-09 |
DE112007000295T5 (en) | 2008-12-11 |
JP2008108684A (en) | 2008-05-08 |
CN101379570B (en) | 2012-09-26 |
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