JPH0662495U - High pressure ignition device with series gap - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an improved high-pressure ignition device with a series gap, which is unlikely to deteriorate on the inner and outer surfaces of the casing even after long-term use. [Structure] A discharge tube for a series gap having a connection terminal that can be connected to an ignition plug connected at one end is embedded in a corona-resistant resin to form a cylindrical casing, and a power supply side terminal of the discharge tube is placed in an internal space of the casing. A female gap part B having an engaging receiving portion on the inner surface of the power feeding side end of the casing and a high-voltage cable inside a body cord cap having an engaging portion engageable with the engaging receiving portion on the outer surface. A power feeding terminal, which is inserted and coupled and fixed to the tip of the cable, is fitted to the male type power feeding component A exposed at the end of the body cord cap, and the power feeding terminal is connected to the power feeding side terminal and the locking receiving portion is engaged. A high pressure igniter with a series gap was constructed by connecting the respective stoppers.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a high pressure ignition device with a series gap used for an ignition device of an automobile engine or the like.

[0002]

[Prior art]

 Ignition devices in automobile engines are designed to apply a high voltage to the spark plug to generate sparks, but in order to prevent smoldering at the time of ignition and to control the ignition timing accurately, A so-called series gap ignition device with a discharge gap provided in series has been proposed. Since it is necessary for the series gap to have a stable discharge voltage, for example, it is known to use a discharge tube in which a discharge electrode is provided at both ends of a cylindrical body and which is filled with an inert gas. ing.

In a high-pressure ignition device incorporating such a series gap discharge tube, a creeping discharge is likely to occur along the outer surface of the discharge tube, which may lead to engine misfire due to dielectric breakdown or the like. On the other hand, in order to prevent dielectric breakdown in the vicinity of the discharge tube, for example, as shown in FIG. 4, the discharge tube 5, the intermediate connection including the connecting portion between the connection terminal 2 and the discharge tube 5 for the spark plug are connected. Assemble additional functional parts such as terminal 6 and resistor 7 and power supply terminal 4 provided at the end of high voltage cable 3 and then integrally embed and cover them with an electrically insulating elastic material layer 11 such as silicone rubber. After being formed, this component is inserted into a cylindrical casing 10 formed of an electrically insulating rigid material such as polyester resin, and is inserted between the inner surface of the casing 10 and the outer surface of the elastic material layer 11. A high-voltage cable device having a structure in which the gap 12 is formed and the connection terminal 2 is fitted and fixed inside the tip of the casing 10 has been proposed.

[0004]

[Problems to be solved by the device]

 However, even with a high-voltage cable device having such a structure, it is possible to avoid deterioration of not only the outer surface of the casing but also the gap between the inner surface and the elastic material layer due to corona discharge generated on the casing surface, etc., for a long period of time. And the ignition timing could not be controlled sufficiently. Therefore, an object of the present invention is to provide an improved high-pressure ignition device with a series gap in which deterioration of the inner and outer surfaces of the casing does not easily occur even after long-term use.

[0005]

[Means for Solving the Problems]

 The above-mentioned object of the present invention is to form a cylindrical casing by embedding a series gap discharge tube having a connection terminal connectable to an ignition plug at one end with a corona resistant resin to form a cylindrical casing, and to connect the discharge tube to the power supply side. A female gap component having a terminal exposed in the internal space of the casing and having a lock receiving portion on the inner surface of the power feeding side end of the casing, and a lock portion engageable with the lock receiving portion are formed on the outer surface. The high-voltage cable is inserted into the body cord cap, and the feeding terminal fixed to the tip of the cable is fitted to the male type power feeding component exposed at the end of the body cord cap, and the feeding side terminal is attached. Can be achieved by a high pressure ignition device with a series gap, characterized in that the power supply terminal is connected to the lock receiving portion and the lock receiving portion is connected to the lock receiving portion.

Silicone rubber is particularly preferably used as the corona-resistant resin for forming the casing of the high-pressure ignition device with a series gap.

[0007]

[Action]

 In the high-pressure ignition device with a series gap of the present invention, since the body code cap is embedded and fixed inside the casing formed of corona-resistant resin by embedding the discharge tube, not only the casing but also the corona-resistant The surface of the body cord cap made of polyester resin, which has insufficient properties, does not deteriorate, and a stable high-voltage pulse voltage can be supplied for a long period of time.

[0008]

【Example】

 An embodiment of the high pressure ignition device with a series gap of the present invention is shown in FIGS. 1 to 3, and the same parts as those in the prior art are designated by the same reference numerals. In the first embodiment shown in FIG. 1, the high voltage cable 3 having the power supply terminal 4 connected to the terminal is inserted into a tubular body code cap 8 formed of an insulating resin, and the power supply terminal 4 is inserted into the body code cap 8. Is fixed so that it is exposed at one end of the body, and a cap-shaped upper cord cap 9 is attached to the other end of the body cord cap 8 to assemble them so as to securely fix them. Part A is configured. A protruding locking portion 8a is formed on the outer surface of the body code cap 8.

On the other hand, the connection terminal 2 for the spark plug is coupled to one end of the series gap discharge tube 5, and these are connected to the spark plug insertion portion 2a of the connection terminal 2 and the power supply side terminal portion of the other end of the discharge tube 5. 5a is incorporated into a cylindrical casing 10 made of silicone rubber so as to bury the other portions without leaving a gap, forming a female gap part B. The casing 10 is formed on the connection terminal 2 side into a female type into which a spark plug can be inserted, and on the power feeding side terminal portion 5a side into a female type into which the power feeding terminal 4 side portion of the body code cap 8 can be inserted. In addition, a lock receiving portion 10a capable of engaging with the lock portion 8a is provided on the inner surface thereof.

In the high-pressure ignition device 1 with a series gap according to the first embodiment of the present invention as described above, the above-mentioned power supply component A is fitted to the above-mentioned gap component B, and the locking portion 8a and the locking receiving portion 10a are provided. In the second embodiment shown in FIG. 2, the gap part B is fitted with the above-mentioned power feeding part A and further with the tightening ring C, and is engaged with the engaging part 10a. The part 8a is not easily detached.

Further, the third embodiment shown in FIG. 3 is one in which the connection terminal 2 is formed of an elastic spring, and the other constitution is essentially the same as that of the first embodiment and the operation is also completely the same. .

[0012]

EFFECTS OF THE INVENTION The high-pressure ignition device with a series gap of the present invention uses a corona-resistant resin such as silicone rubber in the vicinity of the discharge tube to which a high voltage is applied or in a strong electric field such as between the high-voltage cable terminal and the ground. Since it is formed, it is possible to prevent surface deterioration during use. In addition, the parts are preliminarily divided into two kinds of assembly parts, a power supply part and a gap part, and assembled, and then these assembled parts are fitted to manufacture a high pressure ignition device with a series gap. Therefore, there is an advantage that various products with different combinations of characteristics and dimensions can be manufactured with high productivity.

[Brief description of drawings]

FIG. 1 is a sectional view showing the configuration of a first embodiment of a high pressure ignition device with a series gap according to the present invention.

FIG. 2 is a sectional view showing the configuration of a second embodiment of a high pressure ignition device with a series gap according to the present invention.

FIG. 3 is a sectional view showing the configuration of a third embodiment of a high pressure ignition device with a series gap according to the present invention.

FIG. 4 is a cross-sectional view showing a configuration of a conventional high-voltage cable device.

[Explanation of symbols]

 1 series High pressure ignition device with gap 2 Connection terminal 2a Spark plug insertion part 3 High voltage cable 4 Power supply terminal 5 Discharge tube 5a Power supply side terminal part 6 Intermediate connection terminal 7 Resistor 8 Body code cap 8a Locking part 9 Upper code cap 10 Casing 10a Lock receiving part 11 Elastic material layer 12 Gap A Power supply component B Gap component C Tightening ring

Claims (2)

[Scope of utility model registration request] 1. A series gap discharge tube having a connection terminal connectable to an ignition plug at one end is embedded in a corona resistant resin to form a cylindrical casing, and a power supply side terminal of the discharge tube is formed in the casing. Inside the body cord cap, which is exposed in the internal space of the casing and has a locking receiving portion on the inner surface of the power feeding side end of the casing, and a locking portion which is engageable with the locking receiving portion on the outer surface. A high-voltage cable is inserted into the above and a male-type power supply component, in which a power supply terminal coupled and fixed to the end of the cable is exposed at the end of the body cord cap, is fitted, and the power supply terminal is connected to the power supply side terminal. A high pressure ignition device with a series gap, characterized in that the locking portions are respectively coupled to the locking receiving portions. 2. The high pressure ignition device with a series gap according to claim 1, wherein the corona resistant resin is silicone rubber.