EP2234225B1 - Spark plug connector - Google Patents
Spark plug connector Download PDFInfo
- Publication number
- EP2234225B1 EP2234225B1 EP09156347A EP09156347A EP2234225B1 EP 2234225 B1 EP2234225 B1 EP 2234225B1 EP 09156347 A EP09156347 A EP 09156347A EP 09156347 A EP09156347 A EP 09156347A EP 2234225 B1 EP2234225 B1 EP 2234225B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spark plug
- connector
- boot
- spring
- set forth
- 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.)
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Classifications
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- 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 spark plug connector for an internal combustion engine.
- Spark plugs are known to have a male terminal protruding from a ceramic portion.
- a high voltage ignition wire terminal is press fitted and thereby sits onto the male terminal of the spark plug.
- This high voltage electrical connection is surrounded by an elastomeric, electrically insulating boot which is integral to the ignition wire protruding from the spark plug and fits snuggly around the upper ceramic portion of the spark plug.
- the boot also assures that the high voltage electrical connection remains clean and free of moisture thereby providing a strong and efficient spark within the combustion chamber.
- the spark plug In today's complex engines, the spark plug is often positioned into a deep well typically surrounded by an electrically grounded and heat dissipating engine block. After insertion into the well the spark plug is threadably engaged to the engine block.
- the object of the present invention is to resolve these problems by proposing a connector simple in design, cheaper and more compact. More specifically, the invention proposes according to claim 1 a spark plug electrical connector for connecting an ignition coil to a spark plug of an engine in which a spark plug is located within a well presenting a bend at angle X, the connector comprising an electrically insulating tubular boot having a spark plug open end and a coil open end and inside of which is an electrically conductive means connecting the coil to the spark plug and a strengthening member extending substantially from the spark plug open end to the coil open end, and characterised in that the connector makes one bend to form an angle X between the spark plug open end (36) and the coil open end, this in order to accommodate the bend of the well; the strengthening member is bent to also form said angle X.
- Figure 1 represents a portion of an engine block 10 with a spark plug 12 an ignition coil 14 and a spark plug connector 16.
- the spark plug 12 is threaded in the engine block 10 at the bottom of a well 18.
- the spark plug 12 as an electrodes end, located in the combustion chamber of the engine, and a ceramic portion from which is protruding a male terminal 20 emerging at the bottom 22 of the well 18.
- the ignition coil 14 is fixed (fixation mean not represented) onto the engine block 10 at the top end 24 of the well 18.
- the well 16 is bent with the bottom end 22 extending along a lower axis A1, and the top end 24 extending along an upper axis A2.
- the lower axis A1 and the upper axis A2 make an angle X.
- the angle X is preferably between 160° and 180°, but could go to 135°.
- the spark plug connector 16 extends inside the well 18 from the spark plug 12, where it is connected onto it, to the ignition coil 14, whereto it is also connected.
- the connector 16 is bent by the angle X, as is the well 18.
- FIG. 2 details the elements of the spark plug connector 16.
- the connector 16 comprises a tubular boot 30 having an internal surface 32 and an external surface 34, the boot 30 having an annular circular section.
- the boot 30 extends, along axis A1, from a spark plug end 36, to a coil end 38 along axis A2, the boot 30 being open at both ends 36, 38.
- the tubular boot 30 is bent by the angle X.
- the boot 30 is made of one single piece.
- the internal surface 32 of the boot 30 is provided with a shoulder 42 restricting, toward the spark plug end 36, the internal section of the boot 30.
- the internal surface 32 of the boot 30 is provided with an annular groove 44 where an internal elastic ring 46 is located.
- the shoulder 42 and the elastic ring 46 are retaining means for the internal elements of the connector 16.
- the external surface 34 of the boot 30 is provided with a set of radially extending discs forming lips 48 that, as shown on figure 1 , are in sealing contact with the well 18 so that, no dust nor other particles can accumulate around the spark plug 12.
- the boot 30 is made of soft and electrically isolating material such as silicone.
- the connector 16 comprises a first conical spring 50 with large end on abutment against the shoulder 42 and small end oriented upward.
- the connector 16 comprises a second conical spring 52 with large end on abutment against the elastic ring 44 and small end oriented toward downward.
- a rod 54 having a spark plug extremity 56 extending along axis A1 and a coil extremity 58 extending along axis A2.
- the rod 54 is bent as per the angle X.
- the rod 54 is metallic and constitutes a strengthening member for the connector 16.
- the rod 54 extremities 56, 58 are integrally provided with flat heads 60 62 forming plates.
- the spark plug extremity 56 is provided with the first plate 60 radially extending from axis A1.
- the coil extremity 58 is integrally provided with the second plate 62 radially extending from axis A2.
- the first conical spring 50 is on abutment against the first plate 60 by its small end.
- the second conical spring 52 is on abutment against the second plate 62 by its small end.
- the two conical springs 50, 52, the two plates 60, 62 and the rod 54 are of electrically conductive material.
- the surfaces of the electrically conductive elements are smooth without any sharp angle.
- the distance from the shoulder 42 to the internal grove 44 is slightly smaller than the cumulated free length of the two conical springs 50, 52 added to the thickness of the two plates 60, 62 and the length of the rod 54. Therefore when assembled the two conical springs 50, 52, the two plates 60, 62 and the rod 54 are in slight compression ensuring a tight contact between the various elements and, when plugged onto the spark plug 12 and onto the ignition coil 14, providing electrical continuity from the spark plug 12 to the ignition coil 14.
- the manufacturing and assembly process of the connector 16 comprise the following steps:
- the rod 54 is manufactured and equipped with the integral heads 60, 62 forming plates.
- the rod 54 is bent to make the angle X.
- the first spring 50 is inserted inside the tubular boot 30 and positioned on abutment against the shoulder 42.
- the boot 30 is partially straightened and the rod 54 is inserted inside and positioned so that the first plate 60 comes in contact against the first spring 50.
- the second spring 52 is positioned inside with small end in contact against the second plate 62.
- the assembly is slightly axially compressed so that the elastic ring 46 can be positioned inside the groove 44.
Abstract
Description
- This invention relates to a spark plug connector for an internal combustion engine.
- Spark plugs are known to have a male terminal protruding from a ceramic portion. A high voltage ignition wire terminal is press fitted and thereby sits onto the male terminal of the spark plug. This high voltage electrical connection is surrounded by an elastomeric, electrically insulating boot which is integral to the ignition wire protruding from the spark plug and fits snuggly around the upper ceramic portion of the spark plug. In addition to the boot's insulating characteristics, the boot also assures that the high voltage electrical connection remains clean and free of moisture thereby providing a strong and efficient spark within the combustion chamber.
- In today's complex engines, the spark plug is often positioned into a deep well typically surrounded by an electrically grounded and heat dissipating engine block. After insertion into the well the spark plug is threadably engaged to the engine block.
- The latest's engines have an even more complex and compact design resulting in a non straight spark plug well, the well presenting a small bend. To accommodate the bent well,
Idogawa et al. disclose in US2008/0271724 a soft electrically isolating straight boot within which is placed a metallic coil spring enabling the boot to bend to accommodate a bent plug hole. The spark plug connectors may as well be bent accordingly. To properly assemble the connector onto the spark plug, one common solution is an external handle that enables the operator to firmly engage the soft boot onto the spark plug terminal ensuring a correct electrical connection. As a consequence, the state of the art product is complex, costly and requires space to accommodate for the connector and for the external handle. - The object of the present invention is to resolve these problems by proposing a connector simple in design, cheaper and more compact. More specifically, the invention proposes according to claim 1 a spark plug electrical connector for connecting an ignition coil to a spark plug of an engine in which a spark plug is located within a well presenting a bend at angle X, the connector comprising an electrically insulating tubular boot having a spark plug open end and a coil open end and inside of which is an electrically conductive means connecting the coil to the spark plug and a strengthening member extending substantially from the spark plug open end to the coil open end, and characterised in that the connector makes one bend to form an angle X between the spark plug open end (36) and the coil open end, this in order to accommodate the bend of the well;
the strengthening member is bent to also form said angle X. - Additional advantageous features of the invention are that:
- the strengthening member is an element of the electrically conductive means. The strengthening member is an elongated rod having a first end oriented toward the spark plug and a second end oriented toward the coil:
- the electrically conductive means comprises a first spring connected to the spark plug and a second spring connected to the ignition coil;
- the rod is provided with a first plate at its first end, the first plate being in contact with the first spring and a second plate at its second end, the second plate being in contact with the second spring, both plates being substantially flat and orthogonal to the rod,
- the electrically conductive means comprising the first spring, the first plate, the rod, the second plate and the second spring is maintained inside the boot thanks to a retaining means comprising an internal shoulder provided with the boot and located in the vicinity of the first open end and against which the first spring is in abutment and an elastic ring positioned in a groove located inside the boot in the vicinity of the second open end and against which the second spring is in abutment;
- the boot is made of soft material such as silicone;
- all surfaces of the electrically conductive means are smooth without sharp angle so that during assembly when the electrically conductive means is inserted into the boot, and during service, the boot is not damaged.
- Other advantages of the present invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying figures wherein:
-
Figure 1 is a section of an internal combustion engine in the area of the spark plug; -
Figure 2 is a section of the connector object of the invention. -
Figure 1 represents a portion of anengine block 10 with aspark plug 12 anignition coil 14 and aspark plug connector 16. - To ease the description, and without any intention to limit it, the orientation "bottom to top" is, as per
Figure 1 , "from the spark plug to the ignition coil". - The
spark plug 12 is threaded in theengine block 10 at the bottom of awell 18. The spark plug 12 as an electrodes end, located in the combustion chamber of the engine, and a ceramic portion from which is protruding amale terminal 20 emerging at thebottom 22 of thewell 18. - The
ignition coil 14 is fixed (fixation mean not represented) onto theengine block 10 at thetop end 24 of thewell 18. Thewell 16 is bent with thebottom end 22 extending along a lower axis A1, and thetop end 24 extending along an upper axis A2. The lower axis A1 and the upper axis A2 make an angle X. The angle X is preferably between 160° and 180°, but could go to 135°. - The
spark plug connector 16 extends inside thewell 18 from thespark plug 12, where it is connected onto it, to theignition coil 14, whereto it is also connected. Theconnector 16 is bent by the angle X, as is thewell 18. -
Figure 2 details the elements of thespark plug connector 16. Theconnector 16 comprises atubular boot 30 having aninternal surface 32 and anexternal surface 34, theboot 30 having an annular circular section. Theboot 30 extends, along axis A1, from aspark plug end 36, to acoil end 38 along axis A2, theboot 30 being open at bothends tubular boot 30 is bent by the angle X. Preferably, theboot 30 is made of one single piece. - In the vicinity of the
spark plug end 36, theinternal surface 32 of theboot 30 is provided with ashoulder 42 restricting, toward thespark plug end 36, the internal section of theboot 30. - In the vicinity of the
coil end 38, theinternal surface 32 of theboot 30 is provided with an annular groove 44 where an internal elastic ring 46 is located. - The
shoulder 42 and the elastic ring 46 are retaining means for the internal elements of theconnector 16. - In the vicinity of the
spark plug end 36, theexternal surface 34 of theboot 30 is provided with a set of radially extendingdiscs forming lips 48 that, as shown onfigure 1 , are in sealing contact with thewell 18 so that, no dust nor other particles can accumulate around thespark plug 12. - The
boot 30 is made of soft and electrically isolating material such as silicone. - Inside the boot, the
connector 16 comprises a firstconical spring 50 with large end on abutment against theshoulder 42 and small end oriented upward. - The
connector 16 comprises a secondconical spring 52 with large end on abutment against the elastic ring 44 and small end oriented toward downward. - Between the two
conical springs rod 54 having aspark plug extremity 56 extending along axis A1 and acoil extremity 58 extending along axis A2. Therod 54 is bent as per the angle X. Therod 54 is metallic and constitutes a strengthening member for theconnector 16. - The
rod 54extremities flat heads 60 62 forming plates. Thespark plug extremity 56 is provided with thefirst plate 60 radially extending from axis A1. Similarly, thecoil extremity 58 is integrally provided with thesecond plate 62 radially extending from axis A2. - The first
conical spring 50 is on abutment against thefirst plate 60 by its small end. Similarly, the secondconical spring 52 is on abutment against thesecond plate 62 by its small end. - The two
conical springs plates rod 54 are of electrically conductive material. - To avoid damaging the
internal surface 32 of theboot 30, either during assembly of the connector or in operation, the surfaces of the electrically conductive elements are smooth without any sharp angle. - The distance from the
shoulder 42 to the internal grove 44 is slightly smaller than the cumulated free length of the twoconical springs plates rod 54. Therefore when assembled the twoconical springs plates rod 54 are in slight compression ensuring a tight contact between the various elements and, when plugged onto thespark plug 12 and onto theignition coil 14, providing electrical continuity from thespark plug 12 to theignition coil 14. - When assembled, the bent of the
boot 30 and the bent of therod 54 are centered on a same point O. - The manufacturing and assembly process of the
connector 16 comprise the following steps: - The bent
tubular boot 30 is molded of soft material such as silicone. - The
rod 54 is manufactured and equipped with the integral heads 60, 62 forming plates. - The
rod 54 is bent to make the angle X. - The
first spring 50 is inserted inside thetubular boot 30 and positioned on abutment against theshoulder 42. - The
boot 30 is partially straightened and therod 54 is inserted inside and positioned so that thefirst plate 60 comes in contact against thefirst spring 50. - The
second spring 52 is positioned inside with small end in contact against thesecond plate 62. - The electrically conductive elements being in place, the assembly is slightly axially compressed so that the elastic ring 46 can be positioned inside the groove 44.
- This description is not intended to limit the teaching of the present invention. A number of variants are possible such as, the elastic ring 46 being replaced by a second shoulder similar to the
shoulder 42; theheads 60 62 of the rod having a different shape still ensuring an abutment for thesprings 50 52 and a good electrical continuity; in fact thesprings 50 52, here described conical could be different as they adapt on a variety of spark plugs and coils; the electrically conductive elements, here described as five components - two springs, one rod, two plates - could be integral into one piece.
Claims (11)
- Spark plug electrical connector (16) for connecting an ignition coil (14) to a spark plug (12) especially for use with an engine (10) in which a spark plug (12) is located within a deep well (18) presenting a bend at angle X while the ignition coil (14) is outside the well (18), the connector (16) comprising an electrically insulating tubular boot (30) having a spark plug open end (36) and a coil open end (38) and inside of which is an electrically conductive means (50, 60, 54, 62, 52) connecting the coil (14) to the spark plug (12) whereby the connector (16) comprises a strengthening member (54) positioned inside the boot (30), the strengthening member (54) extending substantially from the spark plug open end (36) to the coil open end (38) characterised in that, the connector (16) makes one bend to form an angle X between the spark plug open end (36) and the coil open end (38), the strengthening member (54) being bent to also form said angle X.
- Connector (16) as set forth in claim 1 characterized in that the strengthening member (54) is an element of the electrically conductive means (50, 60, 54, 62, 52).
- Connector (16) as set forth in any of the preceding claim characterized in that the strengthening member (54) is an elongated rod (54) having a first end (56) oriented toward the spark plug (12) and a second end (58) oriented toward the coil (14).
- Connector (16) as set forth in any of the preceding claim characterized in that the electrically conductive means (50, 60, 54, 62, 52) comprises a first spring (50) that is connected to the spark plug (12).
- Connector (16) as set forth in any of the preceding claim characterized in that the electrically conductive means (50, 60, 54, 62, 52) comprises a second spring (52) that is connected to the ignition coil (14).
- Connector (16) as set forth in claims 3 and 4 in combination with any other claim characterized in that the rod (54) is provided with a first plate (60) at its first end (56), the first plate (60) being substantially flat and orthogonal to the rod (54), the first plate (60) being in contact with the first spring (50).
- Connector (16) as set forth in claims 3 and 5 in combination with any other claim characterized in that the rod (54) is provided with a second plate (62) at its second end (58), the second plate (62) being substantially flat and orthogonal to the rod (54), the second plate (62) being in contact with the second spring (52).
- Connector (16) as set forth in claims 6 and 7 characterized in that the electrically conductive means (50, 60, 54, 62, 52) comprising the first spring (50), the first plate (60), the rod (54), the second plate (62) and the second spring (52) is maintained inside the boot (30) thanks to a retaining means (42, 44, 46).
- Connector (16) as set forth in claim 8 characterized in that the retaining means (42, 44, 46) comprises an internal shoulder (42) provided with the boot (30) and located in the vicinity of the first open end (36) and against which the first spring (50) is in abutment and an elastic ring (46) positioned in a groove (44) located inside the boot (30) in the vicinity of the second open end (38) and against which the second spring (52) is in abutment.
- Connector (16) as set forth in any of the preceding claim characterized in that the boot (30) is made of soft material such as silicone.
- Connector (16) as set forth in claim 10 characterized in that all surfaces of the electrically conductive means (50, 60, 54, 62, 52) are smooth without sharp angle so that during assembly when the electrically conductive means (50, 60, 54, 62, 52) is inserted into the boot (30), and during service, the boot (30) is not damaged.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT09156347T ATE544208T1 (en) | 2009-03-26 | 2009-03-26 | SPARK PLUG CONNECTOR |
EP09156347A EP2234225B1 (en) | 2009-03-26 | 2009-03-26 | Spark plug connector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09156347A EP2234225B1 (en) | 2009-03-26 | 2009-03-26 | Spark plug connector |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2234225A1 EP2234225A1 (en) | 2010-09-29 |
EP2234225B1 true EP2234225B1 (en) | 2012-02-01 |
Family
ID=40909885
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09156347A Active EP2234225B1 (en) | 2009-03-26 | 2009-03-26 | Spark plug connector |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2234225B1 (en) |
AT (1) | ATE544208T1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5093375B2 (en) * | 2011-03-16 | 2012-12-12 | 三菱電機株式会社 | Ignition coil device |
SE541409C2 (en) | 2017-06-19 | 2019-09-24 | Sem Ab | Spark plug extension |
CN115013216B (en) * | 2022-07-14 | 2024-01-02 | 东风汽车集团股份有限公司 | Ignition assembly for igniting compression ignition engine, engine and vehicle |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4797115A (en) * | 1987-11-13 | 1989-01-10 | Prestolite Wire Corporation | Angled boot for angled spark plug cable terminals |
JP4267042B2 (en) * | 2007-05-01 | 2009-05-27 | 三菱電機株式会社 | Ignition coil device for internal combustion engine |
-
2009
- 2009-03-26 AT AT09156347T patent/ATE544208T1/en active
- 2009-03-26 EP EP09156347A patent/EP2234225B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP2234225A1 (en) | 2010-09-29 |
ATE544208T1 (en) | 2012-02-15 |
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