JPH0423392B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a watertight structure of a connection part of a high-voltage resistance electric wire that is mainly wired between an ignition coiler and a distributor of an automobile, and between a distributor and a spark plug. It is.

Conventional technology The connection between the terminal part of this type of high-voltage resistance wire for automobiles and the other party's ignition coiler or distributor is as follows.
As shown in FIG. 5 (Japanese Utility Model Publication No. 45-30121), a cap c made of rubber material or the like is provided integrally with the high-voltage resistance wire a near the connection terminal b at the end of the high-voltage resistance wire a. Connect the connecting terminal b of the tower d to the terminal e in the other tower d, and fit the cap c to the outer peripheral surface of the tower d to connect the tower d.
The inside and outside of the device are watertightly isolated, thereby preventing voltage drops due to leakage current.

However, due to long-term use and repeated attachment and detachment, the physical properties of the rubber deteriorate and the fitting force becomes weaker, creating a gap between the rubber and the tower, reducing watertight performance and making it impossible to avoid the occurrence of leakage current.

Problems to be Solved by the Invention The present invention has been made with attention to the above-mentioned points, and has developed a structure that maintains watertightness even when the fitting force of the cap to the tower is reduced.

Means for Solving the Problems In order to achieve the above object, the present invention provides a cap made of synthetic resin that is fitted into the tower of the opposite connection part for the connection part of the high voltage resistance electric wire for automobiles. Adopts a structure in which a contact ring made of soft elastic rubber is provided on one of the cap and the tower, which is integrally joined to the insulating coating of the electric wire, and watertightly isolates the inside and outside of the tower at the fitting part of the cap and the tower. did.

Embodiment In FIG. 1, reference numeral 1 denotes a high-voltage resistance wire (RRC) for an automobile, which is wired between an ignition coil device A of an automobile and a distributor (not shown).

The high-voltage resistance electric wire 1 for automobiles is, as is well known, provided with an insulating coating 1b made of a rubber material around the outer periphery of a nonmetallic resistance conductor 1a, and at the end thereof, the nonmetallic resistance conductor 1a is folded back to form a cylindrical metal terminal. 2 is crimped and crimped (Fig. 4a), or with the nonmetallic resistance conductor 1a exposed, a conductive material such as carbon black, carbon fiber, or metal powder is added to the rubber or synthetic resin material to make it conductive. A terminal 2' made of a polymeric material is provided (FIG. 4b).

In the vicinity of the terminal of the high-voltage resistance wire 1, modified polypropylene whose affinity for rubber materials has been improved is applied to the outer periphery of the rubber insulation coating 1b.
An intermediate bonding layer 3 made of modified polyethylene or the like is formed by a primary mold, and its outer periphery is made of polypropylene, polybutadiene terephthalate, etc.
The cap 4 is integrally formed of an elastic hard resin material such as polyethylene terephthalate by secondary molding. The cap 4 is provided with a jacket part 4b that expands outward from a support cylinder part 4a extending along the high-voltage resistance wire 1 and is fitted onto the outer circumference of the tower 5. A close-fitting cylindrical portion 4c that fits inside the tower, which will be described later, is formed in the cylindrical portion 4c. A plurality of detachable flexible locking pieces 4d are formed at the open end of the sleeve 4b.

The terminal 2 of the high-voltage resistance wire 1 enters into the recess 5a of the tower 5 of the ignition coil device A, and a press terminal 8 is elastically supported by a spring 7 on the electrode 6.
press against. The tower 5 is molded from a synthetic resin material such as polypropylene or epoxy, and a locking frame 5b into which the flexible lock piece 4d enters is formed on its outer periphery, and the cap 4 is fitted onto the tower 5. At this time, the flexible lock piece 4d is attached to the locking frame 5b.
The locking protrusion 4^ _d1 engages with the locking frame 5b.

FIG. 3 shows another embodiment of such a locking mechanism, in which the hook portion 4 of the flexible locking piece 4d' is shown.
_d1 ' is engaged with the locking projection 5' of the tower (Fig. 3a), or the locking hole 4d1'' of the flexible lock piece 4d _' ' is engaged with the locking projection 5b' of the tower. (Figure 3b).

When the cap 4 is fitted to the tower 5,
The close contact cylinder portion 4c presses the terminal 2 and the resistance wire 1 onto the inner circumferential surface of the concave portion 5a of the tower 5 while keeping them straight.

A close contact ring 9 made of a soft elastic rubber material such as silicone rubber or oil-impregnated rubber is provided at the top of the tower 5 to maintain watertightness between the tower 5 and the cap 4.

FIG. 2 shows another embodiment of such a tight ring. In FIG. 2 a, the tight ring 9' is provided from the top of the tower 5 to the outer periphery, and in FIG. 9″
is provided from the top of the tower 5 to the inner circumference.

Effects of the Invention As described above, the present invention provides a cap made of synthetic resin, which is composed of a sleeve part fitted to the outer peripheral surface of the tower of the connecting part and a tight-fitting cylinder part fitted to the inner peripheral part of the tower. A tight ring made of soft elastic rubber is provided integrally with the insulating coating of the high voltage electric wire, and is tightly attached to the mantle and the tight cylindrical portion at the top of the tower to watertightly isolate the inside and outside of the tower. Since it is provided on one side of the cap and the tower, even if the physical properties of the cap deteriorate and the fitting with the tower deteriorates, the tight ring compressed between the cap and the tower will protect the mantle inside and outside of the cap. It is effective in sealing the inside and outside of the tower watertight by sticking tightly to the cylindrical part.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention;
Figures 2a and b are cross-sectional views showing each embodiment of attachment of the tight ring to the tower, Figures 3a and b are cross-sectional views showing the locking structure between the cap and the tower, and Figures 4a and b are high-voltage resistors. A cross-sectional view showing the terminal portion of the electric wire, FIG. 5 is a conventional cross-sectional view. 1... High voltage resistance wire for automobiles, 2... Terminal, 4
...Cap, 5...Tower, 9...Tight ring.

Claims (1)

[Claims] 1. A synthetic resin-made cable consisting of a sleeve part that is fitted to the outer periphery of the tower of the other connection part for the connection part of the high-voltage resistance electric wire for automobiles, and a tight-fitting cylinder part that is fitted to the inner periphery of the tower. A cap is provided integrally with the insulating coating of the high-voltage electric wire, and a tight fit made of soft elastic rubber is provided at the top of the tower and tightly seals the jacket part and the tight cylindrical part to watertightly isolate the inside and outside of the tower. A watertight structure for a connection part in a high-voltage resistance electric wire for an automobile, characterized in that a ring is provided on one of the cap and the tower.