WO1992007187A1 - Verteilerkappe eines zündverteilers mit einer abschirmhaube und abschirmhaube dafür - Google Patents
Verteilerkappe eines zündverteilers mit einer abschirmhaube und abschirmhaube dafür Download PDFInfo
- Publication number
- WO1992007187A1 WO1992007187A1 PCT/EP1991/001996 EP9101996W WO9207187A1 WO 1992007187 A1 WO1992007187 A1 WO 1992007187A1 EP 9101996 W EP9101996 W EP 9101996W WO 9207187 A1 WO9207187 A1 WO 9207187A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrically conductive
- distributor cap
- shielding hood
- conductive material
- domes
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P7/00—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices
- F02P7/02—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of distributors
- F02P7/021—Mechanical distributors
- F02P7/025—Mechanical distributors with noise suppression means specially adapted for the distributor
Definitions
- the invention is based on a distributor cap of an ignition distributor for gasoline engines with a shielding hood made of electrically conductive material, which has holes for the passage of the domes of the distributor cap, through which a high-voltage electrode is passed, the domes being surrounded by an electrically conductive material in the form of a sleeve are connected to the electrically conductive material of the shielding hood.
- Such a distributor cap is from the German company Robert Bosch GmbH. "Technical information, spark fault” 1st edition of 09/30/1978, page 32 and known from DE-C-23 14 460.
- the well-known shielding hoods act like a Faraday cage.
- the Faraday cage has holes, namely where the Pass the dome of the distributor cap through the shielding hood.
- the very strong electromagnetic radiation that arises in the ignition distributor and accompanies the sparks that flash between the fixed electrodes and the rotating rotor in the ignition distributor can therefore escape in part through the holes in the shielding hood and disrupts radio reception.
- the object of the present invention is to improve radio interference suppression in a simple manner in a distributor cap with a shielding hood.
- the domes are surrounded by a sleeve in the form of electrically conductive material, has a connection with the electrically conductive material of the shielding hood and forms an approximately cylindrical capacitor with the electrode in the respective dome, the capacitance of which is selected according to the invention in such a way that one together with the high voltage electrode
- the invention is not limited to using the shielding hood as a Faraday cage, but rather supplements it with filters which specifically strongly attenuate the high-frequency interference radiation in the interference-sensitive reception area.
- the filter is preferably adapted so that a resonance point in the reception frequency range to be suppressed (Attenuation maximum) of the filter.
- the adjustment is made by changing the length and / or arrangement of the respective extension on the associated dome and can be determined and optimized experimentally.
- the receiving frequency range of interest to be suppressed will generally be the FM radio range. However, it is also possible to adapt the filter so that a resonance point lies in another frequency range to be suppressed, in particular in the frequency range for radio telephone traffic (450 MHz band).
- the electrically conductive material which surrounds the domes in the form of a sleeve, is preferably at a distance from the free end of the domes in order to ensure the required high-voltage strength of the distributor cap.
- the greater the high-voltage strength the greater the distance between the electrically conductive material and the free end of the domes. It is therefore best to provide for the sleeve-shaped arrangement of the electrically conductive material at the lower end of the dome, i.e. adjacent to its base points.
- the length of the sleeve-shaped arrangement of the electrically conductive material should not be too small, because the greater the length, the greater the capacitance formed and the more effective the filtering.
- the sleeve-shaped arrangement of the electrically conductive material is preferably between 5 and 30 mm long, preferably 7 to 12 mm, because on the one hand this ensures a capacity which is far greater than that achieved with shielding hoods according to the prior art.
- the distributor cap maintains sufficient high-voltage strength.
- the electrically conductive material is located directly on the respective dome, while avoiding air gaps, because then the distance between the capacitor electrodes is the smallest and the dielectric between them has the highest dielectric constant. This is different in the prior art according to DE-C-23 14 460, because there is deliberately an air gap between the domes and the extensions of the shielding hood surrounding them.
- the sleeve-shaped arrangement of the electrically conductive material can be realized by metallizing the domes on their outside in a corresponding ring-shaped area. This avoids any air gap between the dome and its metallization.
- Metallization can be done by sticking a metal foil. It is more favorable to metallize the domes in the corresponding outer area by electroless metal deposition or to apply a conductive adhesive (an adhesive which contains electrically conductive pigment).
- the shielding hood makes contact with the metallized areas of the dome by the edge of the holes in the shielding hood with a little preload on the outside of the dome, the shielding hood is also used to make the necessary ground contact with the engine block.
- the extensions can be formed as an integral part of the shielding hood when it is formed in one and the same operation, in particular when the shielding hood is - as is known per se - molded from plastic.
- the electrical conductivity of the hood can be achieved by metallizing the hood on the surface, or even better, by using a plastic that is made electrically conductive by an electrically conductive additive (e.g. carbon black or a metal powder).
- the extensions preferably extend - Do not point upwards from the shielding hood (then the shielding hood of the distributor cap should fit closer), but downwards, i.e. from above into the shielding hood.
- transitional forms are also possible in which the extensions each extend partly upwards and partly downwards.
- FIG. 1 shows a top view of a shielding hood according to the invention
- FIG. 2 shows the shielding hood in a longitudinal section along the section line I-I in FIG. 1,
- FIG. 3 shows the shielding hood from FIG. 1 placed on a distributor cap in a top view
- FIG. 4 shows the arrangement from FIG. 3 in longitudinal section along the section lines IV-IV,
- FIG. 5 shows a second exemplary embodiment of the invention with a molded part made of sheet metal arranged in one between the shielding hood and the distributor cap
- FIG. 6 shows the molded part from FIG. 5 in a longitudinal section as in FIG. 5,
- FIG. 7 shows an equivalent circuit diagram of a shielded dome
- Figure 8 shows a filter diagram
- the shield 1 has a central hole 2 for the central dome
- An extension 7 extends from the edge of each of these holes into the interior of the shielding hood 1.
- the extensions are cylindrical in this embodiment, but can also be conical in accordance with the usual conical shape of the domes 4 and 5. The latter is preferred because then the capacitor formed between the extension 7 and the electrode 10 has a larger capacitance and leads to a stronger attenuation of the interference radiation. Conical extensions can lie completely tight against the domes.
- three holes 8 are provided, which are used to fasten the shielding hood on the lower part of an ignition distributor housing.
- the attachment is best done by means of screws 9, which at the same time establish the electrical connection between the shield 1 and the metallic lower part of the ignition distributor housing and above it with the engine block.
- FIGS. 5 and 6 show the arrangement of a molded part 11 made of sheet metal, which is clamped between the distributor cap 6 and the shielding hood 1 and has extensions 7 which rest against the domes 4, 5 and make contact with the shielding hood 1. Holes 12 are provided on the edge of the molded part 11 in positions which correspond to the positions of the holes 8 in the shielding hood, see FIG. 1, so that the shielding hood 1 and the molded part 11 can be connected to the distributor cap 6 by screws 9 .
- FIG. 7 shows a high-frequency equivalent circuit diagram of a dome, for example the central dome 4, which extends upwards from a distributor cap and thereby protrudes through a shielding hood 1 which has a cylindrical extension 7 directed downwards against the distributor cap 6 and which has the forms outer electrode of a cylindrical capacitor with the capacitance C __._.
- the inner electrode of this capacitor is formed by the high voltage electrode 10.
- the capacitance C is coupled approximately in the middle of the high-voltage electrode 10, so that a T-shaped filter element results, in the two branches of which inductances L,. and L- 2 and ohmic resistances R, - and R, _, which are each bridged by capacitances C. and C_, which are determined by the predetermined structure of the
- Middle Dome 4 are conditional.
- the capacitance and an ohmic resistance R which essentially represents the resistance of the shielding hood 1, which in turn is connected to ground (engine block), are located in the foot of the T-link.
- the filter formed in this way dampens high-frequency components of the currents which arise in the event of a sparkover from the high-voltage electrode 10 to the electrode 11 of the distributor rotor that passes by.
- a typical dimensioning for the equivalent circuit is the following:
- L ⁇ , .i, L ⁇ , _-_., R ⁇ -i,, R ⁇ . , _-- ,, C- i and C are determined by the structure of the dome and the position of the extension 7, R is determined by the type and structure of the shielding hood and C "can be adjusted appropriately by a suitable choice of the length of the extension 7. - 12 -
- the filter reduces the interference radiation in the interference-sensitive VHF listening radio range (87-105 MHz), because the filter was dimensioned in such a way that the filter was dimensioned in such a way that in the middle of the VHF- Radio range is a resonance point (attenuation maximum) of the filter.
- another frequency range should preferably be damped, e.g. the frequency range of the C network for radio telephone traffic, then by appropriate adaptation of the extension 7 it can also be achieved that there is a resonance point (damping maximum) of the filter in that frequency range.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3516875A JPH06506745A (ja) | 1990-10-18 | 1991-10-18 | 遮蔽フードを備えた点火配電器キャップ、及び当配電器のための遮蔽フード |
US08/050,251 US5911204A (en) | 1990-10-18 | 1993-04-30 | Ignition distributor cap with a shielding hood and shielding hood, therefor |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP4033017.6 | 1990-10-18 | ||
DE4033017 | 1990-10-18 | ||
DE4101652A DE4101652A1 (de) | 1990-10-18 | 1991-01-22 | Verteilerkappe eines zuendverteilers mit einer abschirmhaube und abschirmhaube dafuer |
DEP4101652.1 | 1991-01-22 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/050,251 Continuation US5911204A (en) | 1990-10-18 | 1993-04-30 | Ignition distributor cap with a shielding hood and shielding hood, therefor |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1992007187A1 true WO1992007187A1 (de) | 1992-04-30 |
Family
ID=25897792
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1991/001996 WO1992007187A1 (de) | 1990-10-18 | 1991-10-18 | Verteilerkappe eines zündverteilers mit einer abschirmhaube und abschirmhaube dafür |
Country Status (5)
Country | Link |
---|---|
US (1) | US5911204A (de) |
EP (1) | EP0553170A1 (de) |
JP (1) | JPH06506745A (de) |
DE (1) | DE4101652A1 (de) |
WO (1) | WO1992007187A1 (de) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR846173A (fr) * | 1937-11-18 | 1939-09-11 | Bosch Gmbh Robert | Distributeur d'allumage à boîtier formant écran protecteur |
FR2222882A5 (de) * | 1973-03-23 | 1974-10-18 | Bosch Gmbh Robert |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1987755A (en) * | 1933-10-06 | 1935-01-15 | Moyle S Skaer | Radio static shield |
US3965879A (en) * | 1974-03-26 | 1976-06-29 | Brunswick Corporation | Radio frequency interference suppression apparatus |
FR2312126A1 (fr) * | 1975-05-21 | 1976-12-17 | Mayer Ferdy | Dispositif antiparasites pour moteur a explosions |
JPS5741469A (en) * | 1980-08-26 | 1982-03-08 | Ngk Spark Plug Co Ltd | Noise-preventing distribution cap of ignition distributor for internal-combustion engine |
JPS5824629A (ja) * | 1981-08-04 | 1983-02-14 | Nissan Motor Co Ltd | デイスクブレ−キのブレ−キロ−タ |
DE3347409A1 (de) * | 1983-12-29 | 1985-07-11 | Robert Bosch Gmbh, 7000 Stuttgart | Vorrichtung zur zuendspannungsverteilung in fuer brennkraftmaschinen bestimmten zuendanlagen |
US4575593A (en) * | 1984-07-05 | 1986-03-11 | General Motors Corporation | Electromagnetic radiation suppressing distributor rotors |
DE3941284A1 (de) * | 1989-12-14 | 1991-06-20 | Duerrwaechter E Dr Doduco | Zuendverteiler fuer verbrennungskraftmaschinen |
JP3084799B2 (ja) * | 1991-07-19 | 2000-09-04 | 株式会社デンソー | 点火配電器 |
-
1991
- 1991-01-22 DE DE4101652A patent/DE4101652A1/de not_active Withdrawn
- 1991-10-18 JP JP3516875A patent/JPH06506745A/ja active Pending
- 1991-10-18 WO PCT/EP1991/001996 patent/WO1992007187A1/de not_active Application Discontinuation
- 1991-10-18 EP EP91918109A patent/EP0553170A1/de not_active Ceased
-
1993
- 1993-04-30 US US08/050,251 patent/US5911204A/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR846173A (fr) * | 1937-11-18 | 1939-09-11 | Bosch Gmbh Robert | Distributeur d'allumage à boîtier formant écran protecteur |
FR2222882A5 (de) * | 1973-03-23 | 1974-10-18 | Bosch Gmbh Robert |
Non-Patent Citations (1)
Title |
---|
Patent Abstracts of Japan, Band 6, Nr. 113 (M-138)[991], 24. Juni 1982, & JP, A, 5741469 (NIPPON TOKUSHO TOGYO K.K.) 8. März 1982 * |
Also Published As
Publication number | Publication date |
---|---|
DE4101652A1 (de) | 1992-07-30 |
EP0553170A1 (de) | 1993-08-04 |
JPH06506745A (ja) | 1994-07-28 |
US5911204A (en) | 1999-06-15 |
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