JPH0249645Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" This invention relates to the terminal part of an ignition cable for internal combustion engines, and more specifically, the invention relates to the terminal part of an ignition cable for internal combustion engines. This relates to the structure of the terminal portion of the ignition cable.

"Prior Art" and "Problems to be Solved by the Invention" In order to connect an ignition cable to the above-mentioned type of spark plug, a cylindrical terminal fitting is connected to the end of the ignition cable, and the terminal fitting This part is housed and locked in an insulating cylindrical body, and the cylindrical body is connected by fitting into a sinkhole of the engine with a spark plug provided at the bottom.

The means for locking the terminal fitting and the insulating cylindrical body is formed by partially cutting out the circumferential wall of the terminal fitting and forming a locking claw that is raised diagonally. A locking means that engages with the locking part to prevent the ignition cable from coming off is fitted with a ring with a locking claw formed separately on the terminal fitting, as in Japanese Utility Model Publication No. 52-29263. There is a locking means that uses a locking claw to prevent the ignition cable from coming off.

However, the former of the above conventional locking means has poor mechanical properties (elasticity and rigidity) as a locking pawl because the locking pawl is made of a plate material of a terminal fitting that prioritizes electrical performance. The latter method has the disadvantage of lacking a locking function, and although the latter has the advantage of being able to form a locking pawl using a material that satisfies mechanical properties, it has a structure in which a separate ring and terminal fitting are combined, making it difficult to ignite. When an external force is applied to the cable, the ring may shift or come off, causing problems in connection with the spark plug. The purpose of the present invention is to solve the above-mentioned conventional difficulties.

``Means for Solving the Problems'' The present invention, which achieves the above objectives, is based on the following: ``A cylindrical terminal fitting is connected to the end of an ignition cable, and the terminal part including the terminal fitting is connected to an insulating cylindrical body. In storing and locking, a small protrusion-shaped locking portion is formed on the outer periphery of the terminal fitting, and the locking portion is formed by protruding its own plate material.
The inner periphery of the insulating cylinder extends from the rear end to the front end in parallel with the axis of the cylinder, and the extended end is bent along the inner periphery, and the locking part is attached to the bent end. The ignition cable has a structure in which a guide groove having a pocket-shaped locking groove to be fitted is formed in the rear end direction, and the locking part is fitted into the guide groove to prevent the ignition cable from retreating. It's on.

"Example" and "Operation" Hereinafter, a detailed explanation will be given with reference to an example. Referring to FIGS. 1 to 3 showing one embodiment thereof, the terminal part of the ignition cable of the present invention has a cylindrical terminal fitting 1 connected to the end of the ignition cable 6, and the terminal fitting 1. The terminal part of the ignition cable 6 containing the ignition cable 6 is housed in the hollow part of the insulating cylinder 2, and the small protrusion-shaped locking part 7 protruding from the outer periphery of the body of the terminal fitting 1 is inserted into the insulating cylinder 2. Pocket-shaped locking groove 8 formed on the inner periphery
The terminal fitting 1 is fitted onto the insulating cylinder 2 to lock it to the insulating cylindrical body 2, thereby preventing the ignition cable 6 from coming off to the rear. The insulating cylindrical body 2 housing and locking the terminal fitting 1 is fitted into a recessed hole of an engine having a spark plug at the bottom, and the tip of the terminal fitting 1 is connected to the spark plug.

Specifically, the terminal fitting 1 has a cylindrical shape as shown in FIG. 2, and the first half is an electrical contact part 3 that connects to the ignition plug, and the second half is an electrical connection part 4 that connects the ignition cable 6. It has become.

The electrical connection part 4 before the ignition cable 6 is connected has a U-shape formed by bending a plate material, and has a saw blade-like part 5 shown in the dotted line at the tip, and is attached to the outer periphery of the ignition cable 6. When the serrated part 5 bites into the sheath of the ignition cable 6 by wrapping it around and crimping it,
The ignition cable 6 and the terminal fitting 1 are electrically connected to each other. On the outer periphery of the intermediate part of the electrical contact part 3 of the terminal fitting 1, two small protrusion-like locking parts 7, which are formed by bulging the plate material of the terminal fitting 1 outward, are formed diametrically. has been done.

On the other hand, on the inner periphery of the hollow part of the insulating cylindrical body 2, there is a pair of guides for a locking part 7 extending from the rear end 2' to the front end 2'' for receiving the end of the ignition cable 6 to which the terminal fitting 1 is connected. A groove 9 is formed parallel to the axis and reaches an intermediate position in the hollow part, and the terminal end of the guide groove 9 is bent about 90 degrees along the circumferential direction, and a locking part 7 is formed at the bent end. Pocket-shaped locking grooves 8 are connected to each other to receive and fit.That is, the guide groove 9 includes a groove extending parallel to the axis from the rear end 2' to the front end 2'', and a groove extending parallel to the axis from the rear end 2' to the front end 2''. The terminal end is bent 90 degrees in the circumferential direction, and the bent end forms a hook-shaped groove having a pocket-shaped locking groove 8 in the direction of the rear end 2'. From the rear end 2' of the insulating cylinder 2,
Fit the locking part 7 of the terminal fitting 1 into the guide groove 9 and insert the end of the ignition cable 6 into the insulating cylinder 2. When the locking part 7 reaches the end of the guide groove 9, approximately
When the ignition cable 6 is rotated 90 degrees and the ignition cable 6 is pulled rearward, the locking part 7 of the terminal fitting 1 is connected to the insulating cylindrical body 2.
The terminal fitting 1 is fitted into a pocket-shaped locking groove 8 to be locked to the insulating cylindrical body 2, thereby preventing the ignition cable 6 from slipping out to the rear.

Note that, at the end of the guide groove 9 in this embodiment, the bottom of the guide groove 9 directly forms the inner circumferential surface of the insulating cylinder 2, and only one side of the side edge 9' of the guide groove 9 is connected to the guide groove 9. It is bent in the circumferential direction with a step at its terminal end, and a pocket-shaped locking groove 8 is formed at the bent end. The locking portion 7 of the terminal fitting 1 fitted into the locking groove 8 engages with the bottom of the locking groove 8 to prevent the ignition cable 6 from retreating.

“Effect of the invention” The terminal portion of the ignition cable of the present invention having the above-described structure and locking action includes a locking portion 7 integrally formed by bulging the plate material of the terminal fitting 1, and an insulating cylindrical body 2. It has a hook-shaped guide groove 9 formed in the hollow part, and has a locking structure in which the locking part 7 is received and locked in the pocket-shaped locking groove 8 at the end of the guide groove 9, so that the terminal of the conventional structure is In contrast to a locking claw made by cutting out a plate material of a metal fitting, the mechanical strength of the locking part 7 is improved, and there is no danger of the ignition cable 6 coming off due to external force when it is pulled out. It has locking performance and has the effect of stabilizing the connection function with the spark plug.

[Brief explanation of drawings]

Fig. 1: A front view showing the terminal part of the ignition cable according to an embodiment of the present invention, Fig. 2: A terminal fitting of the embodiment shown in Fig. 1, A is a front view thereof, B is a side view thereof, Fig. 3 : Shows the insulating cylinder of the embodiment in FIG. 1, where A is a front view thereof, B is a right side view thereof, and C is a left side view thereof. Main symbols: 1: Terminal fitting, 2: Insulating cylinder,
3: Electrical contact portion, 4: Electrical connection portion, 5: Serrated portion, 6: Ignition cable, 7: Locking portion, 8: Locking groove, 9: Guide groove.

Claims (1)

[Scope of utility model registration request] In connecting a cylindrical terminal fitting to the end of an ignition cable and housing and locking the terminal part including the terminal fitting in an insulating cylinder, a self-plate material is bulged on the outer periphery of the terminal fitting. A small protrusion-like locking part is formed on the inner periphery of the insulating cylinder, and extends from the rear end to the front end in parallel to the axis of the cylinder, and the extended end is bent along the inner periphery. Furthermore, the terminal portion of the ignition cable is characterized in that a guiding groove having a pocket-shaped locking groove in the direction of the rear end, into which the locking portion is fitted, is formed at the bent end.