CA1057344A - Distributor with silicon coated discharge electrode - Google Patents
Distributor with silicon coated discharge electrodeInfo
- Publication number
- CA1057344A CA1057344A CA252,817A CA252817A CA1057344A CA 1057344 A CA1057344 A CA 1057344A CA 252817 A CA252817 A CA 252817A CA 1057344 A CA1057344 A CA 1057344A
- Authority
- CA
- Canada
- Prior art keywords
- rotor brush
- silicon
- brush
- rotor
- discharge electrode
- 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
ABSTRACT OF THE DISCLOSURE
A distributor with a rotor brush is described in which a silicon coating is provided on a surface of the rotor brush. The end surface of the rotor brush is coated, by an ion-plating method. The surface of the brush may be cleaned before plating by gas ion sputtering.
A distributor with a rotor brush is described in which a silicon coating is provided on a surface of the rotor brush. The end surface of the rotor brush is coated, by an ion-plating method. The surface of the brush may be cleaned before plating by gas ion sputtering.
Description
e ll , ...
The present invention relates generally to a distributor and more particularly tO a rotor brush of a distribulor treated to suppress electromag-netic lnterference, hereinafter referred ro simply as noise waves, generated by the distributor.
'4J
, It is well known that a distributor provided in a vehicle, such as an automobile or the like, generates noise waves by spark discharges inter-mittently gener~ted ut high rates which interfere with radio and telcvision broadcasting j various kind of radio communication, etc .
These noise waves are becoming an increasingly serious problem because of the recent tendency towards the generation of a s~rong spark discharge in an ignitlon device by a large current in n short time in order to purify the exhaust gases.
Hitherto, various proposals have been made for suppressing these noise waves, but exceedingly few of them huve been put into practical use because of their high cost in the mass production of vehicles or becuuse of .
_~_ .: . . : , : . . , : . . ' .
1()57344 their poor performance. Typical of the noise suppressing means which have been put into practical use is one in which the surface of at least one of the dis-charge electrodes respectively provided on the rotor brush and a side terminal, which are facing each other to form a discharge gap in the distributor, is additionally provided with a coating of highly resistive material, as mentioned in the specification of Japanese Patent No. 858,984, corresponding to U.S. Patent t No. 4,007,342. For example, a rotor brush is composed of a silicon wafer, the surface of which is formed with a coating of highly resistive material or a sili-con oxide coating on the silicon wafer per se. Alternatively, the rotor brush 10 and side terminal are each composed of a brass material or a resistive alloy invar or the like, and on the surface of each of the respective discharge elec-trodes of the rotor brush and the side terminal is deposited, by a spraying method, with a resistive material, such as copper oxide, aluminium oxide, resis- tive alloy invar or the like.
In the examples described herein, silicon is the most superior material ln providing noice wave suppressing characteristics. However, silicon has certain disadvantages in that it is very expensive for the mass production of vehicles and it requires after-treatment to form a coating of silicon oxide as a highly resistive material. While a rotor brush, upon which .. .. .
. . . ..
- ~57344 copper oxide or the like is spray-deposited, is economically practical, there are other disadvantages in such cases in that such a sprayed rotor brush is inferior to the silicon wafer rotor brush as to the noise wave suppressing effect attained, ln that the surface of such a sprayed rotor requires shot-blast treatment and further requires a deposition by spraying of nickel aluminlde or the like as a foundation, in order to increase the stickiness thereof prior to the treatment of spraying copper oxide or the like, and in that the discharging gap has to be specially designed taking into consider-ation the thickness of the sprayed material, which comes to several milli-meters.
An ob~ect of the present invention is to provide a distributorrotor brush which is more suitable for mass production and is less expensive than conventional ones and superior to these in noise wave suppressing cap-ability.
It ls a further object of the present invention to provide an improved method of forming a sillcon coating on a surface of a dlstrlbutor rotor brush.
More particularly, in accordance with one aspect of the invention there is provided in a distributor having a rotor brush with a discharge electrode portion adapted to rotate in association with a driving rotary shaft of an internal combustion engine, and side terminals arranged adjacent to a locus of rotation of the rotor brush, forming a discharge gap between said discharge electrode portion and said side terminals respectively, the improvement which comprises, an ion plated silicon coating disposed on the surface of the discharge electrode portion of the rotor brush for reducing electro-magnetic noise caused by current across said discharge gap. The silicon coating may be disposed on an upper, a lower, and a side surface of the discharge electrode portion. The silicon coating may be disposed only on the side surface of the discharge electrode portion. The thickness of the coating may be 5 - 15 )u.
t ~ - 4 ~' ~' .
-- -` 1057344 ., In accordance with a second c~spect of the invention there is provided, a method for forming a silicon coating on a surface of a rotor brush for a distributor by an ion-plating method, comprising the steps of:
establishing a low pressure atmosphere about said rotor brush;
ionizing an inactive gas in said low pressure atmosphere while main-taining the rotor brush at a relative negative potential; and vapori~ing a silicon mass in the presence of said rotor brush. The - 4a ':'". , :' 1~)5~34~ .
surface of the brush may initially be cleaned by sputtering. ~
Specific embodiments of the invention will now be described having ,;
reference to the accompanying drawlngs in which;
FIGURE 1 is a partially sectional elevation view of a conventional distributor rotor brush;
FIGURE 2 i8 an enlarged plan view of the portion shown wlthin a circle A of Figure 1, when the present invention is applied thereto;
FIGURE 3 is a sectional elevation view of Figure 2;
FIGURE 4 is a perspective view of Figure 2;
FIGURE 5 is a sectional view of a silicon ion-plating device;
FIGURE 6 i8 a perspective view of rotor brushes in the device of Figure 5; ~ : -FIGURE 7 is a graph comparing the characteristics in noise wave suppressing effect of a rotor brush according to the present invention wlth ,~ .
i~
.
~0 , I
1 ' i t ;
10S734~
the conventional ones; and FIC:UI~E 8 is a graph showing the characteristic of Ihe rotor brush according to the present invention when the Ihickness of the silicon plating is changed.
Referring now to FIGURE 1 a distributor 1 is conventionally composed ; of a rotor brush 2 adapted to rotate in associalion with a driving rotary shaft of an internal combustion engine and a plurulity of side terminals 3 are arrungad adjaccnt to a locus of the rotation of the rotor brush 2 with a discharge gap g being provided ~herebetween.
FIGURES 2-4 are enlarged detail views of the portion disposed within the area of a circle A as shown in l-:IGURE 1 when the present invention is applied thereto. A silicon coating 5 of about 5-15,l~ thickness is formed on the surface of the rotor brush 2 or only on the surfacc of ~ discharge electrode portion 4 at the end portion of the rotor brush 2. Sufficient per-formunce is obtained if the silicon coat~ng 5 is formed on the surface of the discharge electrode portion 4 of the rotor brush 2. Eurther even when the silicon coating 5 is ormed only on the surface of the discharge electrode portion 4 - it is sufficient for good performance to form the silicon coating ,;; ¦~ !
i` I ~057344 ,~,..
msinly on the peripheral edge surface G facing the side terminals and only on the portions of the respective upper and lower surfaces 7 and 7', which are perpendicular to the surface G and are adjacent thereto. As the material , composing the rotor brush ? any commonly used good electro-conductive material, such as brass, steel or the like, may be employed.
~",,' . . ':' ~r The formation of the silicon coating 5 on the surface of the rotor brush
The present invention relates generally to a distributor and more particularly tO a rotor brush of a distribulor treated to suppress electromag-netic lnterference, hereinafter referred ro simply as noise waves, generated by the distributor.
'4J
, It is well known that a distributor provided in a vehicle, such as an automobile or the like, generates noise waves by spark discharges inter-mittently gener~ted ut high rates which interfere with radio and telcvision broadcasting j various kind of radio communication, etc .
These noise waves are becoming an increasingly serious problem because of the recent tendency towards the generation of a s~rong spark discharge in an ignitlon device by a large current in n short time in order to purify the exhaust gases.
Hitherto, various proposals have been made for suppressing these noise waves, but exceedingly few of them huve been put into practical use because of their high cost in the mass production of vehicles or becuuse of .
_~_ .: . . : , : . . , : . . ' .
1()57344 their poor performance. Typical of the noise suppressing means which have been put into practical use is one in which the surface of at least one of the dis-charge electrodes respectively provided on the rotor brush and a side terminal, which are facing each other to form a discharge gap in the distributor, is additionally provided with a coating of highly resistive material, as mentioned in the specification of Japanese Patent No. 858,984, corresponding to U.S. Patent t No. 4,007,342. For example, a rotor brush is composed of a silicon wafer, the surface of which is formed with a coating of highly resistive material or a sili-con oxide coating on the silicon wafer per se. Alternatively, the rotor brush 10 and side terminal are each composed of a brass material or a resistive alloy invar or the like, and on the surface of each of the respective discharge elec-trodes of the rotor brush and the side terminal is deposited, by a spraying method, with a resistive material, such as copper oxide, aluminium oxide, resis- tive alloy invar or the like.
In the examples described herein, silicon is the most superior material ln providing noice wave suppressing characteristics. However, silicon has certain disadvantages in that it is very expensive for the mass production of vehicles and it requires after-treatment to form a coating of silicon oxide as a highly resistive material. While a rotor brush, upon which .. .. .
. . . ..
- ~57344 copper oxide or the like is spray-deposited, is economically practical, there are other disadvantages in such cases in that such a sprayed rotor brush is inferior to the silicon wafer rotor brush as to the noise wave suppressing effect attained, ln that the surface of such a sprayed rotor requires shot-blast treatment and further requires a deposition by spraying of nickel aluminlde or the like as a foundation, in order to increase the stickiness thereof prior to the treatment of spraying copper oxide or the like, and in that the discharging gap has to be specially designed taking into consider-ation the thickness of the sprayed material, which comes to several milli-meters.
An ob~ect of the present invention is to provide a distributorrotor brush which is more suitable for mass production and is less expensive than conventional ones and superior to these in noise wave suppressing cap-ability.
It ls a further object of the present invention to provide an improved method of forming a sillcon coating on a surface of a dlstrlbutor rotor brush.
More particularly, in accordance with one aspect of the invention there is provided in a distributor having a rotor brush with a discharge electrode portion adapted to rotate in association with a driving rotary shaft of an internal combustion engine, and side terminals arranged adjacent to a locus of rotation of the rotor brush, forming a discharge gap between said discharge electrode portion and said side terminals respectively, the improvement which comprises, an ion plated silicon coating disposed on the surface of the discharge electrode portion of the rotor brush for reducing electro-magnetic noise caused by current across said discharge gap. The silicon coating may be disposed on an upper, a lower, and a side surface of the discharge electrode portion. The silicon coating may be disposed only on the side surface of the discharge electrode portion. The thickness of the coating may be 5 - 15 )u.
t ~ - 4 ~' ~' .
-- -` 1057344 ., In accordance with a second c~spect of the invention there is provided, a method for forming a silicon coating on a surface of a rotor brush for a distributor by an ion-plating method, comprising the steps of:
establishing a low pressure atmosphere about said rotor brush;
ionizing an inactive gas in said low pressure atmosphere while main-taining the rotor brush at a relative negative potential; and vapori~ing a silicon mass in the presence of said rotor brush. The - 4a ':'". , :' 1~)5~34~ .
surface of the brush may initially be cleaned by sputtering. ~
Specific embodiments of the invention will now be described having ,;
reference to the accompanying drawlngs in which;
FIGURE 1 is a partially sectional elevation view of a conventional distributor rotor brush;
FIGURE 2 i8 an enlarged plan view of the portion shown wlthin a circle A of Figure 1, when the present invention is applied thereto;
FIGURE 3 is a sectional elevation view of Figure 2;
FIGURE 4 is a perspective view of Figure 2;
FIGURE 5 is a sectional view of a silicon ion-plating device;
FIGURE 6 i8 a perspective view of rotor brushes in the device of Figure 5; ~ : -FIGURE 7 is a graph comparing the characteristics in noise wave suppressing effect of a rotor brush according to the present invention wlth ,~ .
i~
.
~0 , I
1 ' i t ;
10S734~
the conventional ones; and FIC:UI~E 8 is a graph showing the characteristic of Ihe rotor brush according to the present invention when the Ihickness of the silicon plating is changed.
Referring now to FIGURE 1 a distributor 1 is conventionally composed ; of a rotor brush 2 adapted to rotate in associalion with a driving rotary shaft of an internal combustion engine and a plurulity of side terminals 3 are arrungad adjaccnt to a locus of the rotation of the rotor brush 2 with a discharge gap g being provided ~herebetween.
FIGURES 2-4 are enlarged detail views of the portion disposed within the area of a circle A as shown in l-:IGURE 1 when the present invention is applied thereto. A silicon coating 5 of about 5-15,l~ thickness is formed on the surface of the rotor brush 2 or only on the surfacc of ~ discharge electrode portion 4 at the end portion of the rotor brush 2. Sufficient per-formunce is obtained if the silicon coat~ng 5 is formed on the surface of the discharge electrode portion 4 of the rotor brush 2. Eurther even when the silicon coating 5 is ormed only on the surface of the discharge electrode portion 4 - it is sufficient for good performance to form the silicon coating ,;; ¦~ !
i` I ~057344 ,~,..
msinly on the peripheral edge surface G facing the side terminals and only on the portions of the respective upper and lower surfaces 7 and 7', which are perpendicular to the surface G and are adjacent thereto. As the material , composing the rotor brush ? any commonly used good electro-conductive material, such as brass, steel or the like, may be employed.
~",,' . . ':' ~r The formation of the silicon coating 5 on the surface of the rotor brush
2 may be achieved by an ion-plating method described hereinafter.
.,".,,,~, .i After lightly washing with trichloroethylene or the like, a great number . of the rotor brushes 2 are closely hung by a supporting rod ~ or the like ln ~ 10 a vaeuum eontuiner 8, u8 shown in l lGU~l~ 5 . At the same time, a mass of ,.~ silieon 10, eonsisting of high purity silicon, is set a eertain dislanee from und facing tllc cclge surfaces û of the discllarge electrodes 4 of the rotor brushes 2. After a vacuum is applied to the container 8, by means of an .; exhaust device 13, argon gas or the like is introduced to thc vacuum area ,, 15 in the eontainer 8 through a gas introducing device 14, thereby providing . an inactive gas atmosphere of argon gas or the like of about 10 torr. A
.. bias voltnge of several KV is applied between the container, which is '~:.
. . grounded to be set at zero potential, and the rotor brush 2 in such a manner . that the eontainer functions as a positive cleetrode and the brushes as a ~ neg~tive el Irode.
'''~.' ~ j 7_ '". l :
:
¦ Thus, a glow discharge is generated to ionize the inactive argon gas or the like into positive ions which rush onto the surface of the rotor brushes 2, which are maintained at negative potential.
The surface of each rolor brush 2 is scraped at a rate of some Ansgtroms per minute by the ions. In this case, if any oxide has been artached on the surface thereof, the portion a~ached with oxide is concen-tratedly scraped by the ions of the inactive gas. A stain or oxide coating ~'"~ on the surface only preliminarily cleaned with trichlene or the like can be readily removed within 10 minutes by sputter-cleaning by the ions. Next, the pressure in the container 8 is depressed to about 10 torr to vaporize the mass of silicon 10 by meuns of an electron beam, plasma arc or the like.
,,., , ' '.
When using the electron beam method, an electron beam 12 is generated by an electron beam generator 1l and is suitably defJectcd l~y npplication of a magnetic field, so as to irradiate on the mass of silicon 10 und thereby fuse and vaporize the mass of silicon lO, The vaporized silicon is attuched to ' the discharge electrode 4 of each rotor brush 2, mainly on the edge surface 6, which is disposed in facing rela~ion ro the mass of silicon 10, and is further attached to a certain extent to the upper and lower, or side nat . :~
surfaces 7 and 7' perpendicular to the surface 6. Thus, ion-plating is ~; effecled. A ul 5-20 minules irredirlion IO vzporize the slliccn is sufficienr ~., . - . I' ~. ' . I
, . . .
--- ~
,, lQ57344 ¦ to form a silicon coating 5 of about 5-15~l~ thickness. The after-trentment ~ -slep to form a silicon oxide coating, which is necessary for the known silicon wafer rotor brush or a rotor brush sprayed with silioon, is not required when the silicon coating is formed by tlie present ion-plating method .
~' The experimental results of the characleristics in noise wave suppress-¦ ing effect of the rotor brush formed with a silicon coating uccording tO the l~ ;' present invention and the influence of the thickness of the silicon coating will be described next.
,'; ' . ' ' ' i, FIGURE 7 shows the measured resulls of the noise wave field intensity, comparing the case when the distributor 1 containing a rotor brush 2 formed with a silicon coating according to the present invention is ,~ actually mounted on a vehicle with Ihe case when a distributor containing u conventional rotor brush sprayed wi~h copper oxide is mounted on a vehicle and with the case when a distributor having un untreated rotor brush is mounled on a vehicle. In FI~U~E 7, the ordinate axis represents the noise wave field inte~;ity (dl~) on the horizont~lly polarized wave plane and the abscissa axis represents the frequency (Mflz) of the measured noise waves.
é ~
:'.
':;' .
I
_9 ;,':, , . ` .1 ., , : ~ -` ~ - l ~ ::
1~57344 It is apparent from I;lGUl~E 7 that the horizontally polarized noise -wave field intensity, when the silicon ion-pluted rotor brush is employed, is always lower than that when the non-treated rotor brush or 1he rotor brush sprayed with highly resistive matel~ial is employed in all the l`requencies within the measured range. This means that, uccording to the present inven-tion, the noise wave suppressing effect is very remarkably improved, by greatly reducing the noise wave field intensity.
FlGURE 8 shows the effect on the hori~ontally polarized noise wave field intensity when the thickness of the silicon layer formed by ion-plating is changed. As seen from this figure, the thickness of about 5-I5 ~ of ion-plated silicon layer results in a satisfactory effect to SUppI'C!SS noise waves.
The rotor brush thus treatecl by the ion-plating method and having a silicon coating of about 5-15 lt thickness shows rhe same excellem effect in noise wave supprcssing capabilities us the silicon wafer rotor brush . I ven if Ihe thickness of the silicon couting is furthel increased nbove the thickness of I5,~, the effect cannot be much improvcd. When the thickness of the silicon coating is selected to be only about 0.5-2.5 ~, the noise ~ave suppressing cffect may deteriorate with long use. llowever, lf the thickness is selected to be more than 5~ , the noise wave suppressing churactclistic is maintained qui~e stable wi~hou~ changing Irom its inirial slate und wilhslunds long usage.
~ 10-'' ' ' When t e brush according lo the present inventioo is ttsed, an ¦ extremely remarkuble effect for suppressing noise waves is obtained whlch is far superior to the rotor brush having a sprayed copper o~;ide coating and is the same as the silicon wafer roto~ brush, which shows the most superior characteristic in noise wave suppressing effe.ct among the conventional rotor ~ brushes ~reated by various kinds of methods for forming a coating Or a highly :', resistive material thereon. Further, preliminary treatments, such as shot-. blast or ~he like, which are always required in the highly resistive material . ,., spraying method and the treatment of spraying nickel aluminide or the like , to form a foundation are not required in the method according to the present.
invention. S~ch treatment is replaced by the sputter cleaning by gas ions ,: in the method of the present invention, resulting~ in a g~reat simplification of the preliminary treatment. Additionally, an after-treutment to form silicon oxide co~ting, SUCII as is required in the production of the silicon wafer brush, is also unnecessary in Ille method of the present invention.
,,,,,' .
Still further, slnce a very thin 5-15,1~ ion-plated layer shows a suffi-.~ cient performance for suppressing noise waves, even if a rotor brush presently :............ in use i8 treated, according to the present invention, without changing its - present shape, the change of the discharge gap between the rotor brush and ~, Ihe s~de ter i als is negligibly sm611. ThGrefore, the present invention does ~ ;
.','~
'. ,, '' ' ~057344 not hsve the problem that arises in the spraying method wherein consideration ~u~t be given beforehand to the thickness of the sprayed layer in planning ;, ant manufacturing.
;, ~. :-,,' ,' ' , ` .
,, ~ .
., . 1`'~ -" .
., ' .
,;: 10 "', 5 `
"' ' . ` ~
. ' 5.
',; ` r, ~"
,, . ' .
,", .
,;, ~,," ~ .
, "
,~ . ' . i'' ZO
, .' 4 ... .
, ' I .
,. ~.
'~': ' ' l .. ,,~, ~.
.;`~' ' ~
.:.'.1' "; , , ;`~, 30 ':; ` t " .
., ;
. , .
": ' ~.~i,.
;~. ,. - , :
.,".,,,~, .i After lightly washing with trichloroethylene or the like, a great number . of the rotor brushes 2 are closely hung by a supporting rod ~ or the like ln ~ 10 a vaeuum eontuiner 8, u8 shown in l lGU~l~ 5 . At the same time, a mass of ,.~ silieon 10, eonsisting of high purity silicon, is set a eertain dislanee from und facing tllc cclge surfaces û of the discllarge electrodes 4 of the rotor brushes 2. After a vacuum is applied to the container 8, by means of an .; exhaust device 13, argon gas or the like is introduced to thc vacuum area ,, 15 in the eontainer 8 through a gas introducing device 14, thereby providing . an inactive gas atmosphere of argon gas or the like of about 10 torr. A
.. bias voltnge of several KV is applied between the container, which is '~:.
. . grounded to be set at zero potential, and the rotor brush 2 in such a manner . that the eontainer functions as a positive cleetrode and the brushes as a ~ neg~tive el Irode.
'''~.' ~ j 7_ '". l :
:
¦ Thus, a glow discharge is generated to ionize the inactive argon gas or the like into positive ions which rush onto the surface of the rotor brushes 2, which are maintained at negative potential.
The surface of each rolor brush 2 is scraped at a rate of some Ansgtroms per minute by the ions. In this case, if any oxide has been artached on the surface thereof, the portion a~ached with oxide is concen-tratedly scraped by the ions of the inactive gas. A stain or oxide coating ~'"~ on the surface only preliminarily cleaned with trichlene or the like can be readily removed within 10 minutes by sputter-cleaning by the ions. Next, the pressure in the container 8 is depressed to about 10 torr to vaporize the mass of silicon 10 by meuns of an electron beam, plasma arc or the like.
,,., , ' '.
When using the electron beam method, an electron beam 12 is generated by an electron beam generator 1l and is suitably defJectcd l~y npplication of a magnetic field, so as to irradiate on the mass of silicon 10 und thereby fuse and vaporize the mass of silicon lO, The vaporized silicon is attuched to ' the discharge electrode 4 of each rotor brush 2, mainly on the edge surface 6, which is disposed in facing rela~ion ro the mass of silicon 10, and is further attached to a certain extent to the upper and lower, or side nat . :~
surfaces 7 and 7' perpendicular to the surface 6. Thus, ion-plating is ~; effecled. A ul 5-20 minules irredirlion IO vzporize the slliccn is sufficienr ~., . - . I' ~. ' . I
, . . .
--- ~
,, lQ57344 ¦ to form a silicon coating 5 of about 5-15~l~ thickness. The after-trentment ~ -slep to form a silicon oxide coating, which is necessary for the known silicon wafer rotor brush or a rotor brush sprayed with silioon, is not required when the silicon coating is formed by tlie present ion-plating method .
~' The experimental results of the characleristics in noise wave suppress-¦ ing effect of the rotor brush formed with a silicon coating uccording tO the l~ ;' present invention and the influence of the thickness of the silicon coating will be described next.
,'; ' . ' ' ' i, FIGURE 7 shows the measured resulls of the noise wave field intensity, comparing the case when the distributor 1 containing a rotor brush 2 formed with a silicon coating according to the present invention is ,~ actually mounted on a vehicle with Ihe case when a distributor containing u conventional rotor brush sprayed wi~h copper oxide is mounted on a vehicle and with the case when a distributor having un untreated rotor brush is mounled on a vehicle. In FI~U~E 7, the ordinate axis represents the noise wave field inte~;ity (dl~) on the horizont~lly polarized wave plane and the abscissa axis represents the frequency (Mflz) of the measured noise waves.
é ~
:'.
':;' .
I
_9 ;,':, , . ` .1 ., , : ~ -` ~ - l ~ ::
1~57344 It is apparent from I;lGUl~E 7 that the horizontally polarized noise -wave field intensity, when the silicon ion-pluted rotor brush is employed, is always lower than that when the non-treated rotor brush or 1he rotor brush sprayed with highly resistive matel~ial is employed in all the l`requencies within the measured range. This means that, uccording to the present inven-tion, the noise wave suppressing effect is very remarkably improved, by greatly reducing the noise wave field intensity.
FlGURE 8 shows the effect on the hori~ontally polarized noise wave field intensity when the thickness of the silicon layer formed by ion-plating is changed. As seen from this figure, the thickness of about 5-I5 ~ of ion-plated silicon layer results in a satisfactory effect to SUppI'C!SS noise waves.
The rotor brush thus treatecl by the ion-plating method and having a silicon coating of about 5-15 lt thickness shows rhe same excellem effect in noise wave supprcssing capabilities us the silicon wafer rotor brush . I ven if Ihe thickness of the silicon couting is furthel increased nbove the thickness of I5,~, the effect cannot be much improvcd. When the thickness of the silicon coating is selected to be only about 0.5-2.5 ~, the noise ~ave suppressing cffect may deteriorate with long use. llowever, lf the thickness is selected to be more than 5~ , the noise wave suppressing churactclistic is maintained qui~e stable wi~hou~ changing Irom its inirial slate und wilhslunds long usage.
~ 10-'' ' ' When t e brush according lo the present inventioo is ttsed, an ¦ extremely remarkuble effect for suppressing noise waves is obtained whlch is far superior to the rotor brush having a sprayed copper o~;ide coating and is the same as the silicon wafer roto~ brush, which shows the most superior characteristic in noise wave suppressing effe.ct among the conventional rotor ~ brushes ~reated by various kinds of methods for forming a coating Or a highly :', resistive material thereon. Further, preliminary treatments, such as shot-. blast or ~he like, which are always required in the highly resistive material . ,., spraying method and the treatment of spraying nickel aluminide or the like , to form a foundation are not required in the method according to the present.
invention. S~ch treatment is replaced by the sputter cleaning by gas ions ,: in the method of the present invention, resulting~ in a g~reat simplification of the preliminary treatment. Additionally, an after-treutment to form silicon oxide co~ting, SUCII as is required in the production of the silicon wafer brush, is also unnecessary in Ille method of the present invention.
,,,,,' .
Still further, slnce a very thin 5-15,1~ ion-plated layer shows a suffi-.~ cient performance for suppressing noise waves, even if a rotor brush presently :............ in use i8 treated, according to the present invention, without changing its - present shape, the change of the discharge gap between the rotor brush and ~, Ihe s~de ter i als is negligibly sm611. ThGrefore, the present invention does ~ ;
.','~
'. ,, '' ' ~057344 not hsve the problem that arises in the spraying method wherein consideration ~u~t be given beforehand to the thickness of the sprayed layer in planning ;, ant manufacturing.
;, ~. :-,,' ,' ' , ` .
,, ~ .
., . 1`'~ -" .
., ' .
,;: 10 "', 5 `
"' ' . ` ~
. ' 5.
',; ` r, ~"
,, . ' .
,", .
,;, ~,," ~ .
, "
,~ . ' . i'' ZO
, .' 4 ... .
, ' I .
,. ~.
'~': ' ' l .. ,,~, ~.
.;`~' ' ~
.:.'.1' "; , , ;`~, 30 ':; ` t " .
., ;
. , .
": ' ~.~i,.
;~. ,. - , :
Claims (4)
PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a distributor having a rotor brush with a discharge electrode portion adapted to rotate in association with a driving rotary shaft of a internal combustion engine, and side terminals arranged adjacent to a locus of rotation of the rotor brush, forming a discharge gap between said discharge electrode portion and said side terminals respectively, the improvement which comprises, an ion plated silicon coating disposed on the surface of the dis-charge electrode portion of the rotor brush for reducing electromagnetic noise caused by current across said discharge gap.
2. Apparatus according to claim 1, the silicon coating being disposed on an upper, a lower, and a side surface of said discharge electrode portion.
3. Apparatus according to claim 1, the silicon coating being disposed only on a side surface of the discharge electrode portion facing the respective side terminal at said discharge gap.
4. Apparatus according to claim 1, wherein the thickness of said silicon coating is 5 - 15 µ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA252,817A CA1057344A (en) | 1976-05-18 | 1976-05-18 | Distributor with silicon coated discharge electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA252,817A CA1057344A (en) | 1976-05-18 | 1976-05-18 | Distributor with silicon coated discharge electrode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1057344A true CA1057344A (en) | 1979-06-26 |
Family
ID=4105995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA252,817A Expired CA1057344A (en) | 1976-05-18 | 1976-05-18 | Distributor with silicon coated discharge electrode |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1057344A (en) |
-
1976
- 1976-05-18 CA CA252,817A patent/CA1057344A/en not_active Expired
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