EP0362777A1 - High tension cable device - Google Patents
High tension cable device Download PDFInfo
- Publication number
- EP0362777A1 EP0362777A1 EP89118264A EP89118264A EP0362777A1 EP 0362777 A1 EP0362777 A1 EP 0362777A1 EP 89118264 A EP89118264 A EP 89118264A EP 89118264 A EP89118264 A EP 89118264A EP 0362777 A1 EP0362777 A1 EP 0362777A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plug
- plug cap
- tension cable
- high tension
- ignition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/02—Details
- H01T13/04—Means providing electrical connection to sparking plugs
Definitions
- This invention relates to a high tension cable, and more particularly to a high tension cable suitable for use with an ignition device to which an additional function part is added such as an ignition device with a series gap.
- a high tension cable device for applying a high voltage boosted by an ignition coil to an ignition plug therethrough is commonly known.
- an additional function part of various types is often accommodated in a plug cap which fits with an ignition plug.
- an ignition device with a series gap has been proposed wherein a so-called series gap is provided at a portion of a high tension cable immediately before an ignition plug to prevent smoking of the ignition plug.
- FIG. 4 shows such an ignition device C with a series gap therein as described above.
- a discharge tube 33 acting as a series gap S is incorporated between a high tension cable 31 connected to a powr source side and an ignition plug 32.
- the discharge tube 33 has a needle electrode 34 at an end portion thereof at which it is connected to the high tension cable 31, and has a flat plate electrode 35 at the other end thereof at which it is connected to the ignition plug 32.
- the distance between the electrodes 34 and 35 defines the series gap S mentioned above.
- the ignition device C having a series gap described above, the high tension cable 31 and the discharge tube 33 which serves as a series gap are connected directly to each other, and actually, attention is not paid very much to assembling facility or productivity in assembling the discharge tube or universal use or the like of the cable.
- a high tension cable device which has an ignition plug fitted at an end portion thereof and is connected at the other end portion thereof to a power source side to apply a high voltage to the ignition plug is constituted such that a plug cap for fitting with the ignition plug has a split structure and has formed therein an empty chamber for incorporating an additional function part such as a series gap therein, and an electrode terminal for engaging with a terminal of the igntion plug is disposed at an end portion of the empty chamber while an electrode terminal connected to the high tension cable is disposed at the other end portion of the empty chamber.
- the plug cap for fitting with the ignition plug has a split structure and the empty chamber for incorporating an additional function part such as a series gap therein is formed in the plug gap, the assembling facility and productivity of such additional function part are improved very much, and also the universal use of the cable can be attained.
- reference numeral 1 denotes a plug cap substantially in the form of a hollow cylinder mounted at an end portion of a high tension cable 31 and made of a PBT material, an unsaturated polyester material or the like.
- the plug cap 1 is divided into two longitudinal parts and is thus composed of an upper plug cap member 2 and a lower plug cap member 3.
- the high tension cable 31 is inserted in the upper plug cap member 2 by way of a hole 4 formed at an upper end portion of the cap.
- An electrode terminal 5 is securely mounted to an end portion of the high tension cable 31 by caulking such that a lower end portion 5a of the electrode terminal may be projected a little from a lower end opening 6 of the upper plug cap member 2.
- the inside of the lower plug cap member 3 is divided into two longitudinal parts thereof by a partition wall 7 such that an empty chamber 8 for performing therein an additional function part such as a series gap between opposite longitudinal ends thereof which will be hereinafter described is formed on the upper side of the partition wall 7 while a plug chamber 9 for fitting with a head portion of an ignition plug not shown is fomed on the lower side of the partition wall 7.
- the partition wall 7 has a small hole 10 formed therein for establishing communication between the empty chamber 8 and the plug chamber 9.
- a plug terminal 11 having a contact portion 11a at an end portion thereof for engaging with a terminal of the ignition plug is fitted in the plug chamber 9 by way of a lower end opening 12 of the lower plug cap member 3 such that a terminal plate 11b formed at the other end portion of the plug terminal 11 by bending is positioned at an end of the small hole 10 on the plug chamber 9 side.
- the upper plug cap member 2 is fitted into an upper opening 13 of the lower plug cap member 3 and then the fitting portion is molded from the outer side with a resin material 14 such as a PBT (polybutylene terephthalate) material or an unsaturated polyester material to integrate the upper plug cap member 2 and the lower plug cap member 3 with each other, then the plug cap 1 having a sufficient durability is formed.
- a resin material 14 such as a PBT (polybutylene terephthalate) material or an unsaturated polyester material to integrate the upper plug cap member 2 and the lower plug cap member 3 with each other, then the plug cap 1 having a sufficient durability is formed.
- the upper plug cap member 2 is covered from above over a substantially entire portion thereof except the fitting portion with the lower plug cap member 3 with a rain cover 15 made of an EPDM (ethylene-propylene copolymer rubber) material or a silicon or oil-containing silicon material to prevent water from entering the plug cap 1 after assembly.
- a rain cover 15 made of an EPDM (ethylene-propylene copolymer rubber) material or a silicon or oil-containing silicon material to prevent water from entering the plug cap 1 after assembly.
- another rain cover 16 is fitted around a lower end portion of the lower plug cap 3 so that, when the plug cap 1 is fitted with the terminal of the ignition plug, water may not enter a location around the ignition plug mounted on a cylinder head not shown.
- the plug cap 1 is assembled such that, for example, a discharge tube 17 acting as a series gap is inserted into the empty chamber 8 of the lower plug cap member 3 by way of the upper end opening 13 of the plug cap member until an external terminal 17a of one of electrodes of the discharge tube 17 enters the small hole 10 and is contacted with the terminal plate 11b of the plug terminal and then the upper plug cap member 2 is telescopically inserted into the lower plug cap member 3 until the electrode terminal 5 at the leading end portion of the high tension cable 31 is contacted with an external terminal 17b of the other electrode of the discharge tube 17, then a high tension cable device having a series gap between the electrode terminals 5 and 11 in the inside therein is constructed thereby. Then, if the high tension cable device having a series gap is assembled to an ignition plug, then an ignition device with a series gap is constructed as a whole, and with the ignition device, an effective ignition voltage can be obtained whereas smoking of its ignition plug can be prevented.
- a noise suppresser is inserted in the empty chamber 8
- a high tension cable can be obtained which is provided with a countermeasure for radio noises, and the high tension cable can effectively cope with radio faults caused by a rise of a required voltage or the like involved in employment of a microcomputer in an automobile and improvement in performance of an engine in recent years.
- an electric element such as an LCR circuit assembled on a printed circuit board or the like can also be inserted into the empty chamber 8, and by employing the split structure for the plug cap 1 in this manner, the assembling facility of various elements to the high tension cable device is improved very much and the productivity is improved.
- FIGS. 2 and 3 show modifications wherein the coupling manner between the upper plug cap member 2 and the lower plug cap member 3 of the high tension cable device described hereinabove is changed.
- a male thread portion 18 is formed on an outer periphery of a lower end portion of an upper plug cap member 2 while a female thread portion 19 is formed on an inner periphery of an upper end portion of a lower plug cap member 3, and a plug cap 1 is assembled by threaded engagement between the upper plug cap member 2 and the lower plug cap member 3.
- a recessed groove 21 is formed at a lower end face of an upper plug cap member 2 in a concentrical relationship with an opening 6 of the plug cap, and a plurality of arresting holes 22 are formed at a lower end wall of the plug cap member 2 such that they communicate with the recessed groove 21 and are opened to an outer circumferential face of a lower end portion of the upper plug cap member 2.
- a fitting portion 23 is formed at an upper end face of a lower plug cap member 3 for fitting into the recessed groove 21, and a plurality of hooks 24 are provided projectingly at locations of an outer periphery of the fitting portion corresponding to the arresting holes 22.
- an O-ring 25 is interposed between the recessed groove 21 and the fitting portion 23.
- a high tension cable device is constituted such that a plug cap for fitting with an ignition plug has a split structure and has formed therein an empty chamber for incorporating an additional function part such as a series gap therein, and an electrode terminal for engaging with a terminal of the ignition plug is disposed at an end portion of the empty chamber while an electrode terminal connected to the high tension cable is disposed at the other end portion of the empty chamber. Accordingly, an additional function part such as a series gap can be assembled very readily at a location immediately before the ignition plug, and the high tension cable device which is superior in assembling facility, productivity and universal use of the cable can be obtained.
Landscapes
- Spark Plugs (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
A high tension cable device which has an ignition plug fitted at one end thereof and connected to a power source side at another end portion thereof to apply a high voltage to the ignition. The device comprises a dividable plug cap attached to the ignition plug; an empty chamber defined within the dividable plug cap, with the empty chamber having first and second longitudinal ends and being adapted to receive an additional function part therein; a first electrode terminal provided at the first longitudinal end for connection with the high tension cable; and a second electrode terminal provided at the second longitudinal end for connection with the ignition plug, with the first and second electrode terminals defining a series gap therebetween.
Description
- This invention relates to a high tension cable, and more particularly to a high tension cable suitable for use with an ignition device to which an additional function part is added such as an ignition device with a series gap.
- A high tension cable device for applying a high voltage boosted by an ignition coil to an ignition plug therethrough is commonly known. In recent years, an additional function part of various types is often accommodated in a plug cap which fits with an ignition plug. For example, an ignition device with a series gap has been proposed wherein a so-called series gap is provided at a portion of a high tension cable immediately before an ignition plug to prevent smoking of the ignition plug.
- FIG. 4 shows such an ignition device C with a series gap therein as described above. In the ignition device C, a
discharge tube 33 acting as a series gap S is incorporated between ahigh tension cable 31 connected to a powr source side and anignition plug 32. Thedischarge tube 33 has aneedle electrode 34 at an end portion thereof at which it is connected to thehigh tension cable 31, and has aflat plate electrode 35 at the other end thereof at which it is connected to theignition plug 32. The distance between theelectrodes - And, as the discharge voltage of the
discharge tube 33 is maintained sufficiently high and the voltage is almost applied to theignition plug 32 after discharging, so-called smoking of the ignition plug, that is, electric current leaks by way of carbon or the like sticking to acentral electrode portion 32a of theignition plug 32 to disable a necessary ignition voltage to be obtained is prevented. - However, with the ignition device C having a series gap described above, the
high tension cable 31 and thedischarge tube 33 which serves as a series gap are connected directly to each other, and actually, attention is not paid very much to assembling facility or productivity in assembling the discharge tube or universal use or the like of the cable. - Thus, it is an object of the present invention to provide a high tension cable device which eliminates such problems of the prior art described above and allows an additional function part such as a so-called series gap to be incorporated very readily at a portion of an ignition device, particularly of an ignition device with a series gap, immediately before an ignition plug.
- In order to attain the object, according to the present invention, a high tension cable device which has an ignition plug fitted at an end portion thereof and is connected at the other end portion thereof to a power source side to apply a high voltage to the ignition plug is constituted such that a plug cap for fitting with the ignition plug has a split structure and has formed therein an empty chamber for incorporating an additional function part such as a series gap therein, and an electrode terminal for engaging with a terminal of the igntion plug is disposed at an end portion of the empty chamber while an electrode terminal connected to the high tension cable is disposed at the other end portion of the empty chamber.
- Since the plug cap for fitting with the ignition plug has a split structure and the empty chamber for incorporating an additional function part such as a series gap therein is formed in the plug gap, the assembling facility and productivity of such additional function part are improved very much, and also the universal use of the cable can be attained.
-
- FIG. 1 is a sectional view showing an embodiment of a high tension cable device according to the present invention;
- FIGS. 2 and 3 are sectional views showing modifications wherein part of the embodiment is modified; and
- FIG. 4 is a sectional view showing an ignition device with a series gap which employs a conventional high tension cable device.
- In the following, an embodiment of a high tension cable device according to the present invention will be described with reference to the drawings. It is to be noted that like parts to those of the prior art are denoted by like reference numerals.
- Referring to FIG. 1,
reference numeral 1 denotes a plug cap substantially in the form of a hollow cylinder mounted at an end portion of ahigh tension cable 31 and made of a PBT material, an unsaturated polyester material or the like. Theplug cap 1 is divided into two longitudinal parts and is thus composed of an upperplug cap member 2 and a lowerplug cap member 3. - The
high tension cable 31 is inserted in the upperplug cap member 2 by way of ahole 4 formed at an upper end portion of the cap. Anelectrode terminal 5 is securely mounted to an end portion of thehigh tension cable 31 by caulking such that alower end portion 5a of the electrode terminal may be projected a little from a lower end opening 6 of the upperplug cap member 2. - Meanwhile, the inside of the lower
plug cap member 3 is divided into two longitudinal parts thereof by apartition wall 7 such that an empty chamber 8 for performing therein an additional function part such as a series gap between opposite longitudinal ends thereof which will be hereinafter described is formed on the upper side of thepartition wall 7 while aplug chamber 9 for fitting with a head portion of an ignition plug not shown is fomed on the lower side of thepartition wall 7. Further, thepartition wall 7 has a small hole 10 formed therein for establishing communication between the empty chamber 8 and theplug chamber 9. Aplug terminal 11 having acontact portion 11a at an end portion thereof for engaging with a terminal of the ignition plug is fitted in theplug chamber 9 by way of a lower end opening 12 of the lowerplug cap member 3 such that a terminal plate 11b formed at the other end portion of theplug terminal 11 by bending is positioned at an end of the small hole 10 on theplug chamber 9 side. - And, if, after insertion of an additional function part into the empty chamber 8 as hereinafter described, the upper
plug cap member 2 is fitted into anupper opening 13 of the lowerplug cap member 3 and then the fitting portion is molded from the outer side with aresin material 14 such as a PBT (polybutylene terephthalate) material or an unsaturated polyester material to integrate the upperplug cap member 2 and the lowerplug cap member 3 with each other, then theplug cap 1 having a sufficient durability is formed. - It is to be noted that the upper
plug cap member 2 is covered from above over a substantially entire portion thereof except the fitting portion with the lowerplug cap member 3 with arain cover 15 made of an EPDM (ethylene-propylene copolymer rubber) material or a silicon or oil-containing silicon material to prevent water from entering theplug cap 1 after assembly. Similarly, anotherrain cover 16 is fitted around a lower end portion of thelower plug cap 3 so that, when theplug cap 1 is fitted with the terminal of the ignition plug, water may not enter a location around the ignition plug mounted on a cylinder head not shown. - Thus, if the
plug cap 1 is assembled such that, for example, adischarge tube 17 acting as a series gap is inserted into the empty chamber 8 of the lowerplug cap member 3 by way of the upper end opening 13 of the plug cap member until anexternal terminal 17a of one of electrodes of thedischarge tube 17 enters the small hole 10 and is contacted with the terminal plate 11b of the plug terminal and then the upperplug cap member 2 is telescopically inserted into the lowerplug cap member 3 until theelectrode terminal 5 at the leading end portion of thehigh tension cable 31 is contacted with anexternal terminal 17b of the other electrode of thedischarge tube 17, then a high tension cable device having a series gap between theelectrode terminals - Meanwhile, if, for example, a noise suppresser is inserted in the empty chamber 8, then a high tension cable can be obtained which is provided with a countermeasure for radio noises, and the high tension cable can effectively cope with radio faults caused by a rise of a required voltage or the like involved in employment of a microcomputer in an automobile and improvement in performance of an engine in recent years.
- Further, an electric element such as an LCR circuit assembled on a printed circuit board or the like can also be inserted into the empty chamber 8, and by employing the split structure for the
plug cap 1 in this manner, the assembling facility of various elements to the high tension cable device is improved very much and the productivity is improved. - FIGS. 2 and 3 show modifications wherein the coupling manner between the upper
plug cap member 2 and the lowerplug cap member 3 of the high tension cable device described hereinabove is changed. - In the case of the modification of FIG. 2, a
male thread portion 18 is formed on an outer periphery of a lower end portion of an upperplug cap member 2 while afemale thread portion 19 is formed on an inner periphery of an upper end portion of a lowerplug cap member 3, and aplug cap 1 is assembled by threaded engagement between the upperplug cap member 2 and the lowerplug cap member 3. And, the fixing performance and the sealing performance between the upperplug cap member 2 and the lowerplug cap member 3 are assured by abonding agent 20 of the silicon type or the fluorine type applied to the engaging portion between the upper and lowerplug cap members - To the contrary, in the case of the modification of FIG. 3, a
recessed groove 21 is formed at a lower end face of an upperplug cap member 2 in a concentrical relationship with an opening 6 of the plug cap, and a plurality of arrestingholes 22 are formed at a lower end wall of theplug cap member 2 such that they communicate with therecessed groove 21 and are opened to an outer circumferential face of a lower end portion of the upperplug cap member 2. Meanwhile, afitting portion 23 is formed at an upper end face of a lowerplug cap member 3 for fitting into therecessed groove 21, and a plurality ofhooks 24 are provided projectingly at locations of an outer periphery of the fitting portion corresponding to the arrestingholes 22. And, an O-ring 25 is interposed between therecessed groove 21 and thefitting portion 23. Thus, theplug cap 1 is assembled by engagement between the arrestingholes 22 of the upper plug cap member and thehooks 24 of the lower plug cap member to snap fit the two members and the sealing performance is assured by the O-ring 25. - It is to be noted that, in the case of the devices of FIGS. 2 and 3 described above, if the coupling portion between the upper
plug cap member 2 and the lowerplug cap member 2 is molded from the outside with a resin material or the like, then theplug cap member 1 which is further improved in durability can be obtained. - As apparent from the foregoing description, according to the present invention, a high tension cable device is constituted such that a plug cap for fitting with an ignition plug has a split structure and has formed therein an empty chamber for incorporating an additional function part such as a series gap therein, and an electrode terminal for engaging with a terminal of the ignition plug is disposed at an end portion of the empty chamber while an electrode terminal connected to the high tension cable is disposed at the other end portion of the empty chamber. Accordingly, an additional function part such as a series gap can be assembled very readily at a location immediately before the ignition plug, and the high tension cable device which is superior in assembling facility, productivity and universal use of the cable can be obtained.
Claims (5)
1. A high tension cable device which has an ignition plug fitted at one end portion thereof and connected to a power source side at another end portion thereof to apply a high voltage to said ignition plug, said high tension cable device comprising
a dividable plug cap attached to said ignition plug;
an empty chamber defined within said dividable plug cap, said empty chamber having first and second longitudinal ends and being adapted to receive an additional function part therein;
a first electrode terminal provided at said first longitudinal end for connection with a high tension cable; and
a second electrode terminal provided at said second longitudinal end for connection with the ignition plug, said first and second electrode terminals defining a series gap therebetween.
a dividable plug cap attached to said ignition plug;
an empty chamber defined within said dividable plug cap, said empty chamber having first and second longitudinal ends and being adapted to receive an additional function part therein;
a first electrode terminal provided at said first longitudinal end for connection with a high tension cable; and
a second electrode terminal provided at said second longitudinal end for connection with the ignition plug, said first and second electrode terminals defining a series gap therebetween.
2. A high tension cable device according to claim 1, wherein said plug cap includes first and second plug cap members.
3. A high tension cable device according to claim 2, wherein said first plug cap member is telescopically inserted into said second plug cap member and sealed from outside thereof by means of synthetic resin.
4. A high tension cable device according to claim 2, wherein said first plug cap member is screwed into said second plug cap member and sealed therebetween by means of adhesive.
5. A high tension cable device according to claim 2, wherein said first and second plug cap members are snap fitted with each other and sealed by means of an O-ring provided therebetween.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12956288U JPH0425813Y2 (en) | 1988-10-04 | 1988-10-04 | |
JP129562/88U | 1988-10-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0362777A1 true EP0362777A1 (en) | 1990-04-11 |
Family
ID=15012560
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89118264A Withdrawn EP0362777A1 (en) | 1988-10-04 | 1989-10-02 | High tension cable device |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0362777A1 (en) |
JP (1) | JPH0425813Y2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5145433A (en) * | 1989-07-14 | 1992-09-08 | Yazaki Corporation | High tension cable device and process of producing the same |
US5593308A (en) * | 1992-09-25 | 1997-01-14 | Sumitomo Wiring Systems, Ltd. | Connecting assembly for ignition plug in gasoline engine and method for producing same |
WO2013020552A1 (en) * | 2011-08-11 | 2013-02-14 | Motortech Gmbh | Spark plug connector |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2206215A1 (en) * | 1972-02-10 | 1973-08-23 | Bosch Gmbh Robert | SPARK PLUG CABLE CONNECTOR |
GB1358670A (en) * | 1971-08-25 | 1974-07-03 | Kabel Metallwerke Ghh | Connector for sparking plugs of internal combustion engines |
US3995183A (en) * | 1974-04-16 | 1976-11-30 | Siemens Aktiengesellschaft | Spark gap component for use in ignition systems of internal combustion engines |
US4580341A (en) * | 1982-12-30 | 1986-04-08 | Precision Mecanique Labinal | Electrical connector |
DE3436628A1 (en) * | 1984-10-05 | 1986-04-10 | BERU Ruprecht GmbH & Co KG, 7140 Ludwigsburg | Spark plug |
-
1988
- 1988-10-04 JP JP12956288U patent/JPH0425813Y2/ja not_active Expired
-
1989
- 1989-10-02 EP EP89118264A patent/EP0362777A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1358670A (en) * | 1971-08-25 | 1974-07-03 | Kabel Metallwerke Ghh | Connector for sparking plugs of internal combustion engines |
DE2206215A1 (en) * | 1972-02-10 | 1973-08-23 | Bosch Gmbh Robert | SPARK PLUG CABLE CONNECTOR |
US3995183A (en) * | 1974-04-16 | 1976-11-30 | Siemens Aktiengesellschaft | Spark gap component for use in ignition systems of internal combustion engines |
US4580341A (en) * | 1982-12-30 | 1986-04-08 | Precision Mecanique Labinal | Electrical connector |
DE3436628A1 (en) * | 1984-10-05 | 1986-04-10 | BERU Ruprecht GmbH & Co KG, 7140 Ludwigsburg | Spark plug |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5145433A (en) * | 1989-07-14 | 1992-09-08 | Yazaki Corporation | High tension cable device and process of producing the same |
US5593308A (en) * | 1992-09-25 | 1997-01-14 | Sumitomo Wiring Systems, Ltd. | Connecting assembly for ignition plug in gasoline engine and method for producing same |
WO2013020552A1 (en) * | 2011-08-11 | 2013-02-14 | Motortech Gmbh | Spark plug connector |
US9160120B2 (en) | 2011-08-11 | 2015-10-13 | Motortech Gmbh | Spark plug connector |
Also Published As
Publication number | Publication date |
---|---|
JPH0425813Y2 (en) | 1992-06-22 |
JPH0250973U (en) | 1990-04-10 |
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