CA1080056A - Radio frequency interference suppressing ignition distributor rotor - Google Patents
Radio frequency interference suppressing ignition distributor rotorInfo
- Publication number
- CA1080056A CA1080056A CA306,291A CA306291A CA1080056A CA 1080056 A CA1080056 A CA 1080056A CA 306291 A CA306291 A CA 306291A CA 1080056 A CA1080056 A CA 1080056A
- Authority
- CA
- Canada
- Prior art keywords
- distributor
- rotor
- body member
- axis
- tip surface
- 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.)
- Expired
Links
Landscapes
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
RADIO FREQUENCY INTERFERENCE SUPPRESSING
IGNITION DISTRIBUTOR ROTOR
Abstract of the Disclosure:
To reduce the breakdown potential magnitude across the distributor gap between the output tip surface of an ignition distributor rotor segment and each of the output elec-trodes of the distributor cap, a layer of silicone rubber dielectric material is secured to at least a portion of the longitudinal surface area of the rotor segment and is so located that the terminal edge of the layer nearest the output tip surface is no further than .040 inch radially inwardly from the output tip surface.
IGNITION DISTRIBUTOR ROTOR
Abstract of the Disclosure:
To reduce the breakdown potential magnitude across the distributor gap between the output tip surface of an ignition distributor rotor segment and each of the output elec-trodes of the distributor cap, a layer of silicone rubber dielectric material is secured to at least a portion of the longitudinal surface area of the rotor segment and is so located that the terminal edge of the layer nearest the output tip surface is no further than .040 inch radially inwardly from the output tip surface.
Description
* * * * * * *
The subject invention is directed to an ignition distributor rotor and, more specifically, to a radio frequency interference suppressing ignition distributor rotor.
Various studies have shown that one of the sources of motor vehicle radio frequency interference radiation is the breakdown of the distributor gap between the distributor rotor segment output tip surface and each of the circumferentially disposed distributor output terminals. Laboratory observations indicate that the radio frequency interference generated across this distributor gap is substantially reduced with a reduction of distributor gap breakdown voltage. These laboratory observa-tions further indicate that excessive radio frequency interference radiation is produced when the distributor gap breakdown voltage exceeds approximately 12 kilovolts. Therefore, an ignition dis-tributor rotor including an arrangement which substantially re-duces the distributor gap breakdown voltage is desirable.
- ,................... .
~.
.""'1"' . :' ' ' ' '~ "'' ' ' " ':- ~ ' ." .' " ' '' ~ ' ' :: ' ' ' ' ' ' . ' ' : . . . ' 10~ S6 It is, therefore, an object of this invention to .
provide an improved ignition distributor rotor. .- :
It is another object of this invention to provide : ~.
an improved ignition distributor rotor that substantially reduces distributor gap radio frequency interference radiation. . :
It is a further object of this invention to provide an ~ ~
improved ignition distributor rotor having a layer of dielectric .
material secured to at least a portion of the longitudinal ..
surface area of the rotor segment in close proximity to the rotor . :
10 segment output tip surface. .:
In accordance with this invention, a radio fre~uency interference suppressing ignition dis~ributor rotor is provided :
wherein a layer of silicone rubber dielectric material is secured to at least a portion of the longitudinal surface area of the rotor segment in close proximity to the rotor segment output tip surface~
For a better understanding of the present invention, together with additional objects, advantages and features there- :
of, reference is made to the following description and accompany-ing drawing in which:
FIGURE 1 is a vertical section view of a portion of an ignition distributor showing the distributor rotor of this in-vention mounted therein. ;
FIGURE 2 is a top view of the distributor rotor of ;-.
this invention showing, in addition, the relationship between .-.
the rotor segment output tip surface and one of the distr~lbutor ~.
output terminals;
FIGURE 3 is a section view of FIGURE 2 taken along .;
line 3-3 and looking in the direction of the arrows; and FIGURE 4 is a perspective view of a portion of the distributor rotor of this invention. .
~080~5G
In the several FIGURES of the drawing, like elements have been assigned like numerals of reference.
As is well known in the automotive art, the ignition distributor rotor 10, FIGURE 1, is rotated by a driving shaft 11, usually gear-coupled to the camshaft of the associated internal ~-combustion engine, within a distributor cap 12 having a center input terminal 13, to which is connected one end of the associ-ated ignition coil secondary winding and a plurality of output terminals, one of which is shown at 15, circumferentially dis-posed about the rotor 10 axis of rotation to which the engine spark plugs are connected through respective spark plug leads in a manner well known in the automotive art. Although only one distributor output terminal is shown in FIGURE 1, in which the distributor cap 12 is illustrated in cross-section, it is to be specifically understood that an output terminal is provided for each of the engine spark plugs and that they are circumferenti-ally disposed about the center input terminal in a manner well known in the automotive art.
The ignition distributor rotor of this invention com-prises a body member 20 of an electrical insulating material ,,: . . .
adapted to engage and be rotated about an axis of rotation bydriving shaft 11 and a rotor segment 21 of an electrically con-ductive material such as copper supported by body member 20.
Rotor segment 21 extends in a direction toward and terminates radially inwardly from the circumferentially disposed distributor output terminals. The cross-section surface area of rotor segment 21 at the extremity thereof nearest the circumferentially disposed ~
distributor output terminals defines an output tip surface 21a ~ ;
that extends substantially parallel to the axis of rotation of 30 body member 20 and which, while ro-tor segment 21 is rotated with -~
body member 20, traces a circular path radially inwardly from the '" ' ' ' 1 ' -- ~0~0~56 circumferentially disposed distributor output terminals by a predetermined arc gap 22. In the automotive art, the arc gap corresponding to arc gap 22 is usually called the "distributor gap" and will hereinafter be so referred toO Without intention or inference of a limitation thereto, rotor segment 21 is illus-trated in the drawing as being of a rectangular cross-section having opposite top and bottom flat face surfaces 21b and 21c, FIGURE 3, and opposite edge surfaces 21d and 21e, FIGURE 4. With this embodiment, the top and bottom flat face surfaces 21b and 21c define, at the extremities thereof nearest the circumferen-tially disposed distributor output terminals, the top and bottom edge boundaries of output tip surface 21a that extends sub- `
stantially parallel to the axis of rotation of body member 20. `
Rotor segment 21 may he placed in electrical circuit contact with center electrode 13 through a contact member 30 of an electrically conductive material such as copper or stainless steel. Contact member 30 is an intimate electrical contact with rotor segment 21 along adjacent surfaces of both located beneath -a retaining member 31 and is arranged to be also in electrical 20 contact with center input terminal 13 of distributor cap 12. ;
Alternatively, rotor segment 21 may be of a sufficient length to electrically contact center input terminal 13. In a practical application, the electrical insulating material of which body member 20 is made is a 30% glass-reinforced thermoplastic poly-ester molding material. Body member 20 may be secured to the distributor centrifugal weight base, not shown, by screws, one of which is illustrated in FIGURE 1 and referenced by the numeral ~;
32. As the distributor centrifugal weight base is rotated by shaft 11 in a manner weIl known in the automotive art, body member 20 is rotated therewith about a vertical axis of rotation as viewing FIGURE 1. One ex~mple of an ignition distributor with ~8~056 which the distributor rotor of this invention may be used is described in United States patent No. 3,923,028, Campbell et al, which issued December 2, 1975 and is assigned to the same assignee as is this application. It is to be specifically understood, however, that any other arrangement through which body member 20 is adapted to engage and be rotated by driving shaft 11 may be employed without departing from the spirit of this invention.
In the actual embodiment illustrated in the drawing, contact member 3~ is shown to be an elongated member of an elec-trically conductive material such as copper or stainless steel in intimate electrical contact with rotor segment 21 and having one end thereof in electrical contact with center input terminal 13 of distributor cap 12. With this arrangement, the ignition spark potential produced by the secondary winding of the associ-ated ignition coil may be delivered to successive ones of the circumferentially disposed distributor ou-tput terminals as rotor body member 20 is rotated by shaft 11 in timed relationship with -~
an associated internal combustion engine, in a manner well known in the automotive art. This circuit may be traced through input terminal 13, contact member 30, rotor segment 21 and the distri-butor gap 22 between the rotor segment 21 output tip surface 21a and each of the distributor output terminals. The distributor gap 22 is best seen in FIG~RES 1, 2 and 3 of the drawing. ~;
As has been previously brought out, the higher the : . . :, voltage required to break down the distributor gap, the higher is the radio frequency interference radiation. Consequently, ~;
one way of reducing the distributor gap radio frequency inter-. : .:- .
ference radiation is to reduce the magnitude of the voltage re-quired to break down the distributor gap.
As it is necessary that free electrons be provided to initiate an arc across the distributor gap and since the number , '~':'' ' ...: , .' .. ~.. ..... .
~L08~56 of free electrons provided is determined by the available charge or the electric field intensity, one way of reducing the distri-butor gap breakdown voltage is to provide a higher electric field intensity in the vicinity of the distributor gap. In this regard, actual observations show that the distributor gap breakdown voltage is inversely proportional to the electric field intensity, the greater the electrical field intensity the lower the breakdown voltage. To increase the electric field intensity at the dis-tributor gap, a layer of silicone rubber dielectric material 40 is secured to at least a portion of the longitudinal surface area of rotor segment 21 and located in close proximity to the rotor segment 21 output tip surface 21a. The interface between the layer o~ silicone rubber dielectric material 40 and the metal of rotor segment 21 intensifies the electric field in the vicinity of the distributor gap 22. This localized intensified electric ~
field at the silicone rubber dielectric layer-rotor segment metal -interface enhances electron discharge from the metal of rotor segment 21 for the reason that this intensified electric field produces a local corona discharge. The radiation resulting from this local corona discharge causes electrons to be emitted into the distributor gap. Upon the initiation of emission of elec-krons into the distributor gap, the effect avalanches, a con-dition which results in a significantly reduced distributor gap breakdown voltage. It may be noted that, since the emission of electrons from the metal of the rotor segment 21 is required to initiate the distributor gap discharge, rotor segment 21 must be negatively polarized. Furthermore, the field intensification at the interface between the layer of silicone rubber dielectric material 40 and the metal of the rotor segment 21 is directly proportional to the dielectric constant of the silicone rubber dielectric material employed. Actual observations indicate that `i~
- - :
the silicone rubber dielectric material should have a minimum dielectric constant of the order of 4. Further, actual obser-vations indicate that the terminating edge of the layer of sili- -cone rubber dielectric material nearest the rotor segment 21 output tip surface 21a should be within a range of 0" to .040"
radially inwardly from output tip surface 21a. In an actual embodiment, the silicone rubber dielectric material employed is a commercially available silicone rubber dielectric material marketed by the General Electric Company under the designation 10 RTV 102, White. This material has a dielectric constant of -approximately 4.7. In this actual embodiment with a distributor rotor of the type illustrated in the drawing, the breakdown volt-age across a 3 millimeter distributor gap is reduced from 20 kilo-volts to 8 kilovolts. Actual observations also indicate that it is extremely important that the layer of silicone rubber dielectric material not extend over any portion of the rotor segment 21 out-put tip surface 21a and, further, that the silicone rubber di-electric material not extend beyond the edge of the rotor segment 21 output tip surface 21a as both of these conditions result in intolerable "in car" FM radio receiver noise.
Although the layer of silicone rubber dielectric material 40 is shown in the drawing to be secured to the top flat face surface 21b of rotor segment 21, it is to be specifically ;
understood that this layer of silicone rubber dielectric material -may be secured to the bottom flat face surface 21c or both of ~ -these surfaces so long that it does not extend beyond nor cover any portion of output tip surface 21a. Further, the layer of silicone rubber may be employed with rotor segments having cross-sections other than rectangular.
While a preferred embodiment of the present invention has been shown and described, it will be obvious to those qkilled ... , ,. . . , , , :
., ,, . : . . .
5~
in the art that various modifications and substitutions may be ~ :
made without departing from the spirit of the invention which is to be limited only within the scope of the appended claims. ~
' ' .' . .
"...~
~,. . '' ''' ~ ' ;'' "~ ~, ' ''"
:', ,; ', :' ' ' ~ ' .~.,. ;~; ~. .
, :":, ::' '`''.,'`' ' - :
: ~ ' :':
"',' '' '."
., . ,, ", 8 ~.
The subject invention is directed to an ignition distributor rotor and, more specifically, to a radio frequency interference suppressing ignition distributor rotor.
Various studies have shown that one of the sources of motor vehicle radio frequency interference radiation is the breakdown of the distributor gap between the distributor rotor segment output tip surface and each of the circumferentially disposed distributor output terminals. Laboratory observations indicate that the radio frequency interference generated across this distributor gap is substantially reduced with a reduction of distributor gap breakdown voltage. These laboratory observa-tions further indicate that excessive radio frequency interference radiation is produced when the distributor gap breakdown voltage exceeds approximately 12 kilovolts. Therefore, an ignition dis-tributor rotor including an arrangement which substantially re-duces the distributor gap breakdown voltage is desirable.
- ,................... .
~.
.""'1"' . :' ' ' ' '~ "'' ' ' " ':- ~ ' ." .' " ' '' ~ ' ' :: ' ' ' ' ' ' . ' ' : . . . ' 10~ S6 It is, therefore, an object of this invention to .
provide an improved ignition distributor rotor. .- :
It is another object of this invention to provide : ~.
an improved ignition distributor rotor that substantially reduces distributor gap radio frequency interference radiation. . :
It is a further object of this invention to provide an ~ ~
improved ignition distributor rotor having a layer of dielectric .
material secured to at least a portion of the longitudinal ..
surface area of the rotor segment in close proximity to the rotor . :
10 segment output tip surface. .:
In accordance with this invention, a radio fre~uency interference suppressing ignition dis~ributor rotor is provided :
wherein a layer of silicone rubber dielectric material is secured to at least a portion of the longitudinal surface area of the rotor segment in close proximity to the rotor segment output tip surface~
For a better understanding of the present invention, together with additional objects, advantages and features there- :
of, reference is made to the following description and accompany-ing drawing in which:
FIGURE 1 is a vertical section view of a portion of an ignition distributor showing the distributor rotor of this in-vention mounted therein. ;
FIGURE 2 is a top view of the distributor rotor of ;-.
this invention showing, in addition, the relationship between .-.
the rotor segment output tip surface and one of the distr~lbutor ~.
output terminals;
FIGURE 3 is a section view of FIGURE 2 taken along .;
line 3-3 and looking in the direction of the arrows; and FIGURE 4 is a perspective view of a portion of the distributor rotor of this invention. .
~080~5G
In the several FIGURES of the drawing, like elements have been assigned like numerals of reference.
As is well known in the automotive art, the ignition distributor rotor 10, FIGURE 1, is rotated by a driving shaft 11, usually gear-coupled to the camshaft of the associated internal ~-combustion engine, within a distributor cap 12 having a center input terminal 13, to which is connected one end of the associ-ated ignition coil secondary winding and a plurality of output terminals, one of which is shown at 15, circumferentially dis-posed about the rotor 10 axis of rotation to which the engine spark plugs are connected through respective spark plug leads in a manner well known in the automotive art. Although only one distributor output terminal is shown in FIGURE 1, in which the distributor cap 12 is illustrated in cross-section, it is to be specifically understood that an output terminal is provided for each of the engine spark plugs and that they are circumferenti-ally disposed about the center input terminal in a manner well known in the automotive art.
The ignition distributor rotor of this invention com-prises a body member 20 of an electrical insulating material ,,: . . .
adapted to engage and be rotated about an axis of rotation bydriving shaft 11 and a rotor segment 21 of an electrically con-ductive material such as copper supported by body member 20.
Rotor segment 21 extends in a direction toward and terminates radially inwardly from the circumferentially disposed distributor output terminals. The cross-section surface area of rotor segment 21 at the extremity thereof nearest the circumferentially disposed ~
distributor output terminals defines an output tip surface 21a ~ ;
that extends substantially parallel to the axis of rotation of 30 body member 20 and which, while ro-tor segment 21 is rotated with -~
body member 20, traces a circular path radially inwardly from the '" ' ' ' 1 ' -- ~0~0~56 circumferentially disposed distributor output terminals by a predetermined arc gap 22. In the automotive art, the arc gap corresponding to arc gap 22 is usually called the "distributor gap" and will hereinafter be so referred toO Without intention or inference of a limitation thereto, rotor segment 21 is illus-trated in the drawing as being of a rectangular cross-section having opposite top and bottom flat face surfaces 21b and 21c, FIGURE 3, and opposite edge surfaces 21d and 21e, FIGURE 4. With this embodiment, the top and bottom flat face surfaces 21b and 21c define, at the extremities thereof nearest the circumferen-tially disposed distributor output terminals, the top and bottom edge boundaries of output tip surface 21a that extends sub- `
stantially parallel to the axis of rotation of body member 20. `
Rotor segment 21 may he placed in electrical circuit contact with center electrode 13 through a contact member 30 of an electrically conductive material such as copper or stainless steel. Contact member 30 is an intimate electrical contact with rotor segment 21 along adjacent surfaces of both located beneath -a retaining member 31 and is arranged to be also in electrical 20 contact with center input terminal 13 of distributor cap 12. ;
Alternatively, rotor segment 21 may be of a sufficient length to electrically contact center input terminal 13. In a practical application, the electrical insulating material of which body member 20 is made is a 30% glass-reinforced thermoplastic poly-ester molding material. Body member 20 may be secured to the distributor centrifugal weight base, not shown, by screws, one of which is illustrated in FIGURE 1 and referenced by the numeral ~;
32. As the distributor centrifugal weight base is rotated by shaft 11 in a manner weIl known in the automotive art, body member 20 is rotated therewith about a vertical axis of rotation as viewing FIGURE 1. One ex~mple of an ignition distributor with ~8~056 which the distributor rotor of this invention may be used is described in United States patent No. 3,923,028, Campbell et al, which issued December 2, 1975 and is assigned to the same assignee as is this application. It is to be specifically understood, however, that any other arrangement through which body member 20 is adapted to engage and be rotated by driving shaft 11 may be employed without departing from the spirit of this invention.
In the actual embodiment illustrated in the drawing, contact member 3~ is shown to be an elongated member of an elec-trically conductive material such as copper or stainless steel in intimate electrical contact with rotor segment 21 and having one end thereof in electrical contact with center input terminal 13 of distributor cap 12. With this arrangement, the ignition spark potential produced by the secondary winding of the associ-ated ignition coil may be delivered to successive ones of the circumferentially disposed distributor ou-tput terminals as rotor body member 20 is rotated by shaft 11 in timed relationship with -~
an associated internal combustion engine, in a manner well known in the automotive art. This circuit may be traced through input terminal 13, contact member 30, rotor segment 21 and the distri-butor gap 22 between the rotor segment 21 output tip surface 21a and each of the distributor output terminals. The distributor gap 22 is best seen in FIG~RES 1, 2 and 3 of the drawing. ~;
As has been previously brought out, the higher the : . . :, voltage required to break down the distributor gap, the higher is the radio frequency interference radiation. Consequently, ~;
one way of reducing the distributor gap radio frequency inter-. : .:- .
ference radiation is to reduce the magnitude of the voltage re-quired to break down the distributor gap.
As it is necessary that free electrons be provided to initiate an arc across the distributor gap and since the number , '~':'' ' ...: , .' .. ~.. ..... .
~L08~56 of free electrons provided is determined by the available charge or the electric field intensity, one way of reducing the distri-butor gap breakdown voltage is to provide a higher electric field intensity in the vicinity of the distributor gap. In this regard, actual observations show that the distributor gap breakdown voltage is inversely proportional to the electric field intensity, the greater the electrical field intensity the lower the breakdown voltage. To increase the electric field intensity at the dis-tributor gap, a layer of silicone rubber dielectric material 40 is secured to at least a portion of the longitudinal surface area of rotor segment 21 and located in close proximity to the rotor segment 21 output tip surface 21a. The interface between the layer o~ silicone rubber dielectric material 40 and the metal of rotor segment 21 intensifies the electric field in the vicinity of the distributor gap 22. This localized intensified electric ~
field at the silicone rubber dielectric layer-rotor segment metal -interface enhances electron discharge from the metal of rotor segment 21 for the reason that this intensified electric field produces a local corona discharge. The radiation resulting from this local corona discharge causes electrons to be emitted into the distributor gap. Upon the initiation of emission of elec-krons into the distributor gap, the effect avalanches, a con-dition which results in a significantly reduced distributor gap breakdown voltage. It may be noted that, since the emission of electrons from the metal of the rotor segment 21 is required to initiate the distributor gap discharge, rotor segment 21 must be negatively polarized. Furthermore, the field intensification at the interface between the layer of silicone rubber dielectric material 40 and the metal of the rotor segment 21 is directly proportional to the dielectric constant of the silicone rubber dielectric material employed. Actual observations indicate that `i~
- - :
the silicone rubber dielectric material should have a minimum dielectric constant of the order of 4. Further, actual obser-vations indicate that the terminating edge of the layer of sili- -cone rubber dielectric material nearest the rotor segment 21 output tip surface 21a should be within a range of 0" to .040"
radially inwardly from output tip surface 21a. In an actual embodiment, the silicone rubber dielectric material employed is a commercially available silicone rubber dielectric material marketed by the General Electric Company under the designation 10 RTV 102, White. This material has a dielectric constant of -approximately 4.7. In this actual embodiment with a distributor rotor of the type illustrated in the drawing, the breakdown volt-age across a 3 millimeter distributor gap is reduced from 20 kilo-volts to 8 kilovolts. Actual observations also indicate that it is extremely important that the layer of silicone rubber dielectric material not extend over any portion of the rotor segment 21 out-put tip surface 21a and, further, that the silicone rubber di-electric material not extend beyond the edge of the rotor segment 21 output tip surface 21a as both of these conditions result in intolerable "in car" FM radio receiver noise.
Although the layer of silicone rubber dielectric material 40 is shown in the drawing to be secured to the top flat face surface 21b of rotor segment 21, it is to be specifically ;
understood that this layer of silicone rubber dielectric material -may be secured to the bottom flat face surface 21c or both of ~ -these surfaces so long that it does not extend beyond nor cover any portion of output tip surface 21a. Further, the layer of silicone rubber may be employed with rotor segments having cross-sections other than rectangular.
While a preferred embodiment of the present invention has been shown and described, it will be obvious to those qkilled ... , ,. . . , , , :
., ,, . : . . .
5~
in the art that various modifications and substitutions may be ~ :
made without departing from the spirit of the invention which is to be limited only within the scope of the appended claims. ~
' ' .' . .
"...~
~,. . '' ''' ~ ' ;'' "~ ~, ' ''"
:', ,; ', :' ' ' ~ ' .~.,. ;~; ~. .
, :":, ::' '`''.,'`' ' - :
: ~ ' :':
"',' '' '."
., . ,, ", 8 ~.
Claims (3)
1. A radio frequency interference suppressing ignition distributor rotor of the type adapted to be rotated about its axis within a distributor cap having a plurality of output terminals circumferentially disposed about the rotor axis of rotation comprising: a body member of an electrical insulating material rotatable about an axis of rotation; a rotor segment of an electrically conductive material supported by said body member and having at least top and bottom flat face surfaces that define, at the extremities thereof nearest said output terminals, the top and bottom edge boundaries of an output tip surface that extends substantially parallel to said axis of rotation of said body member and which, while said rotor segment is rotated with said body member, traces a circular path radially inwardly from said circumferentially disposed distributor cap output terminals by a predetermined distributor arc gap; and a layer of silicone rubber dielectric material secured to at least one of said rotor segment top and bottom flat face surfaces and so located that the terminating edge thereof nearest said output tip surface is with-in a range of 0" to .040" radially inwardly from the edge boundary of said output tip surface, said silicone rubber layer being effective to reduce the breakdown potential across said distri-butor arc gap whereby the radiation of the radio frequency inter-ference generated by an electrical discharge across said dis-tributor arc gap is effectively suppressed.
2. A radio frequency interference suppressing ignition distributor rotor of the type adapted to be rotated about its axis within a distributor cap having a plurality of output terminals circumferentially disposed about the rotor axis of rotation comprising: a body member of an electrical insulating material rotatable about an axis of rotation; a rotor segment of an electrically conductive material supported by said body member and having at least top and bottom flat face surfaces that define, at the extremities thereof nearest said output terminals, the top and bottom edge boundaries of an output tip surface that extends substantially parallel to said axis of rotation of said body member and which, while said rotor segment is rotated with said body member, traces a circular path radially inwardly from said circumferentially disposed distributor cap output terminals by a predetermined distributor arc gap; and a layer of silicone rubber material having a minimum dielectric constant of the order of 4.0 secured to at least one of said rotor segment top and bottom flat face surfaces and so located that the terminating edge thereof nearest said output tip surface is within a range of 0" to .040"
radially inwardly from the edge boundary of said output tip surface, said silicone rubber layer being effective to reduce the breakdown potential across said distributor arc gap whereby the radiation of the radio frequency interference generated by an electrical discharge across said distributor arc gap is effect-ively suppressed.
radially inwardly from the edge boundary of said output tip surface, said silicone rubber layer being effective to reduce the breakdown potential across said distributor arc gap whereby the radiation of the radio frequency interference generated by an electrical discharge across said distributor arc gap is effect-ively suppressed.
3. A radio frequency interference suppressing ignition distributor rotor of the type adapted to be rotated about its axis within a distributor cap having a plurality of output termin-als circumferentially disposed about the rotor axis of rotation comprising: a body member of an electrical insulating material rotatable about an axis of rotation; a rotor segment of an elec-trically conductive material supported by said body member and extending in a direction toward and terminating radially inwardly from said circumferentially disposed distributor cap output terminals, the cross-section surface area thereof at the extremity thereof nearest said output terminals defining an output tip surface that extends substantially parallel to said axis of rotation of said body member and which, while said rotor segment is rotated with said body member, traces a circular path radially inwardly from said circumferentially disposed dis-tributor cap output terminals by a predetermined distributor arc gap; and a layer of silicone rubber dielectric material secured to at least a portion of the longitudinal surface of said rotor segment and so located that the terminating edge thereof nearest said output tip surface is within a range of 0" to .040" radially inwardly from said output tip surface, said silicone rubber layer being effective to reduce the breakdown potential across said distributor arc gap whereby the radiation of the radio frequency interference generated by an electrical discharge across said distributor arc gap is effectively suppressed.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US84824377A | 1977-11-03 | 1977-11-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1080056A true CA1080056A (en) | 1980-06-24 |
Family
ID=25302762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA306,291A Expired CA1080056A (en) | 1977-11-03 | 1978-06-27 | Radio frequency interference suppressing ignition distributor rotor |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1080056A (en) |
-
1978
- 1978-06-27 CA CA306,291A patent/CA1080056A/en not_active Expired
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| MKEX | Expiry |