EP0489056A1 - Ignition distributor for internal combustion engines. - Google Patents
Ignition distributor for internal combustion engines.Info
- Publication number
- EP0489056A1 EP0489056A1 EP90912410A EP90912410A EP0489056A1 EP 0489056 A1 EP0489056 A1 EP 0489056A1 EP 90912410 A EP90912410 A EP 90912410A EP 90912410 A EP90912410 A EP 90912410A EP 0489056 A1 EP0489056 A1 EP 0489056A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- distributor
- distributor according
- pin
- rotor
- 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.)
- Granted
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
- F02P7/022—Details of the distributor rotor or electrode
Definitions
- the invention is based on an ignition distributor for internal combustion engines with a housing in which a distributor rotor is rotatably mounted, which has a first electrode close to its axis of rotation and a second electrode at its end remote from the axis of rotation and one in between has two electrodes connecting electrical lead,
- a distributor cap which closes the housing and which has a plurality of fixed electrodes cooperating with the second electrode of the distributor rotor and a center electrode which is distributed on its inner circumference and ends with a spark gap at a short distance from the first electrode of the distributor rotor,
- an electrode is formed in a pin-like manner.
- Such an ignition distributor is known from DE-37 43 940 AI.
- the first electrode of the distributor rotor which together with the center electrode of the distributor cap forms a spark gap, is designed as a socket into which the pin-shaped center electrode projects.
- Both electrodes are made of brass, as is usual with spark gaps.
- the aim is to keep the effective distance between the two electrodes as small as possible; it is typically 0.5 mm and should be a maximum of 1 mm.
- the electrodes of the spark gap are not subject to mechanical wear, but the life of the electrodes forming the spark gap has so far been unsatisfactory.
- the present invention has for its object to provide an ignition distributor of the type mentioned with a longer life of the pair of electrodes enclosing the center electrode of the distributor cap.
- the design of the ignition distributor in accordance with the invention achieves two things: The fact that the electrode which cooperates with the pin-shaped electrode is not, as in the prior art, a socket which encloses the pin-shaped electrode over its entire circumference, but rather an electrode which the pin-shaped If the electrode does not enclose or covers less than the entire circumference, even if the sparks are not coaxially arranged, it cannot always roll over to the pin-shaped electrode in the same place, but must migrate inevitably, with the lower the angle, the more uniform the erosion around which the pin-shaped electrode is enclosed by the other electrode.
- the pin-shaped electrode is therefore preferably enclosed by the other electrode over less than half the circumference.
- the aggressive gases can escape more easily from the region of the two electrodes if, unlike in the prior art, the pin-shaped electrode is no longer surrounded by a closed socket. It is particularly favorable if the other electrode, together with the pin-shaped
- TZBLATT Electrode forms the spark gap, has a substantially flat surface facing the pin-shaped electrode, because then the pin-shaped electrode burns off particularly uniformly and the escape of the aggressive gases from the electrode area is particularly easy and becomes when the pin-shaped electrode the center electrode of the distributor cap is further favored in that the other electrode rotating with the distributor rotor provides for air movement which promotes the escape of the aggressive gases from the electrode area, especially when the flat surface of the rotating electrode is inclined or skewed against the longitudinal axis of the pin-shaped electrode.
- the invention can be carried out in such a way that the pin-shaped electrode is either the center electrode of the distributor cap or the first electrode of the distributor rotor, the first possibility being preferred because it enables better ventilation of the electrode area than if the pin-shaped electrode on the distributor ⁇ runner would be appropriate.
- An extension of the distributor rotor which like a fan blade for an additional one, is preferably allowed to protrude further into this space
- the first electrode of the distributor rotor can be part of this extension provided for the air circulation or can be separated from it, for example diametrically opposite it with respect to the axis of rotation.
- the pin-shaped electrode is partially surrounded by the other electrode, it may be beneficial for the ventilation of the electrode area to make the surrounding electrode perforated.
- Another possibility of improving the ventilation of the electrode area is to provide a through hole in the distributor rotor in the region of the pin-shaped electrode, which hole is expediently opposite the pin-shaped central electrode of the distributor cap, but does not have to run in the direction of the axis of rotation, but preferably obliquely to The axis of rotation runs, whereby a pumping effect is achieved.
- Another possibility of well ventilating the electrode area is to arrange the pin-shaped electrode and the other electrode not next to one another but opposite one another, so that the sparkover occurs from the tip of the pin-shaped electrode to the opposite electrode, which is the pin-shaped
- the electrode preferably faces a flat surface which is larger than the cross-sectional area of the pin-shaped electrode, so that deviations from a precisely coaxial arrangement are harmless for the operation of the spark gap.
- ERSA TZBLATT A further possibility of improving the ventilation of the spark gap is to provide the first electrode of the distributor rotor with a projection on its side facing the pin-shaped central electrode of the distributor cap, in particular with a rib parallel to the pin-shaped electrode, which has the effect of a Fan wing has.
- This projection is made of a material with a higher wear resistance than the electrode in the area outside the projection has; outside the area of the projection, where the electrode is not exposed to a spark discharge, it can consist of an easily processable, electrically highly conductive material such as copper or brass, to which the more wear-resistant projection is welded.
- a suitable choice of materials can be used to achieve more wear-resistant electrodes in different ways.
- One possibility is to manufacture the electrode from a material or to equip it with a material that is more noble than copper.
- Materials containing at least 20% by weight of silver or at least 10% by weight of palladium are particularly suitable, in particular silver-nickel composite materials or palladium-copper alloys.
- Materials made of silver with 10 to 40% by weight, preferably 30% by weight of nickel or made of palladium with 10 to 30% by weight, preferably 15% by weight of copper are particularly suitable.
- Such materials are known per se for use as electrical contacts, as materials for electrodes in spark gaps
- Another advantageous possibility of increasing the chemical resistance of the electrodes is to manufacture them from materials or to equip them with materials that are covered with a passivating cover layer.
- materials from the group of the alloys of copper with nickel are particularly suitable, the nickel content expediently being between 10 and 40% by weight, preferably about 30% by weight; by adding a little iron (1 to 2% by weight) the chemical resistance can be further improved.
- Materials made of chromium-alloyed steels are also suitable for the electrodes because they protect themselves from the attack of aggressive gases with a passivating chrome oxide cover layer. These materials, which are covered with a matching cover layer, are also not common for electrodes in spark gaps.
- Electrodes with a lower electron work function require a lower arc voltage for the sparkover and this means that the sparkover is accompanied by a lower energy conversion. This not only reduces the electrical losses in the distributor, but also produces less reactive gases.
- Figure 1 shows an ignition distributor in cross section; the section is at right angles to the axis of rotation of the distributor rotor through the distributor rotor, according to section line A-B in FIG. 2;
- FIG. 2 shows the relative arrangement of distributor cap and distributor rotor in a longitudinal section through the axis of rotation of the distributor rotor according to section line E-F in FIG. 1, and
- FIG. 3 shows a further longitudinal section through the arrangement of distributor cap and distributor rotor, specifically offset by 90 ° in comparison to FIG. 2, according to section line C-D in FIG. 1.
- the distributor cap 1 From the housing of the ignition distributor, only the distributor cap 1 is shown, which has a pin-shaped central electrode 2 and distributed around its circumference a plurality of fixed electrodes 3 parallel to the central electrode 2, the electrode surfaces 3a facing the central electrode 2 on the inside of the distributor cap to have.
- REPLACEMENT SHEET In the ignition distributor there is a distributor rotor 4 which can be rotated about an axis 5 which runs coaxially to the central electrode 2.
- the flat base body of the distributor rotor has three bores 6, 7 and 8 for fastening the distributor rotor to the end of the camshaft of an internal combustion engine, the housing (engine block) of which also forms one half of the housing of the ignition distributor, the other half of which is the distributor cap 1 .
- the distributor runner carries two electrodes.
- a first, elongated electrode 9 is arranged on the upper side of the base body of the distributor rotor 4, extends in the radial direction and ends tightly, namely at a distance of approximately 0.5 mm, in front of the outer surface of the cylindrical center electrode 2 of the distributor cap.
- the distributor rotor carries a second electrode 10, which has a radially outwardly facing surface which, when the distributor rotor rotates, runs a short distance in front of the surfaces 3a of the fixed electrodes 3.
- the electrodes 9 and 10 are connected to one another by an electrical line 11 embedded in the distributor rotor.
- the first electrode 9 of the distributor rotor which works together with the central electrode 2 is a guader-shaped electrode which has a flat end face 9a facing the central electrode 2.
- the normals of the radially extending surfaces of the electrode 9 enclose an angle of approximately 45 ° with the axis of rotation 5 of the distributor rotor 4.
- the electrode 9 acts like a fan blade, which ensures air circulation in the space between the distributor rotor 4 and the distributor cap 1.
- the air circulation is reinforced by an extension 12 of the distributor rotor diametrically opposite the electrode 9. Due to the air circulation, a constant air exchange takes place in the area of the spark gap, which is formed between the center electrode 2 and the first electrode 9 of the distributor rotor, which removes the aggressive gases accompanying the flashover, thereby removing the electrodes 9 and 2 from their chemical attack.
- the center electrode 2 is not stressed on one side, but burns evenly because the first electrode 9 of the distributor rotor is arranged on one side next to the center electrode 2 and is guided around it.
- the invention is applicable in the field of the automotive industry (manufacturer, supplier, spare parts business).
Abstract
L'allumeur comporte un boîtier dans lequel tourne un rotor (4), qui présente, à proximité de son axe de rotation (5), une première électrode (9) et, à l'extrémité éloignée de son axe de rotation, une deuxième électrode (10) et également, entre ces deux emplacements, un conducteur électrique (11) reliant les deux électrodes. Le boîtier est fermé par un capot (1) dont l'intérieur comporte, à sa périphérie, plusieurs électrodes fixes (3) fonctionnant avec la deuxième électrode (10) du rotor, ainsi qu'une électrode centrale (2) dont l'extrémité est placée à faible distance de la première électrode (9) du rotor, de manière à former un intervalle explosif. Dans la paire d'électrodes formée par la première électrode (9) du rotor et l'électrode centrale (2), l'une des électrodes (2) est allongée, tandis que l'autre électrode (9) n'entoure pas l'électrode allongée (2) ou l'entoure sur une distance inférieure à son périmètre.The igniter comprises a housing in which a rotor (4) rotates, which has, near its axis of rotation (5), a first electrode (9) and, at the end remote from its axis of rotation, a second electrode (10) and also, between these two locations, an electrical conductor (11) connecting the two electrodes. The housing is closed by a cover (1) the interior of which comprises, at its periphery, several fixed electrodes (3) operating with the second electrode (10) of the rotor, as well as a central electrode (2) whose end is placed a short distance from the first electrode (9) of the rotor, so as to form an explosive gap. In the pair of electrodes formed by the first electrode (9) of the rotor and the central electrode (2), one of the electrodes (2) is elongated, while the other electrode (9) does not surround the 'elongated electrode (2) or surrounds it for a distance less than its perimeter.
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE8910037U | 1989-08-22 | ||
DE8910037U DE8910037U1 (en) | 1989-08-22 | 1989-08-22 | |
PCT/EP1990/001395 WO1991002899A1 (en) | 1989-08-22 | 1990-08-22 | Ignition distributor for internal combustion engines |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0489056A1 true EP0489056A1 (en) | 1992-06-10 |
EP0489056B1 EP0489056B1 (en) | 1994-10-12 |
Family
ID=6842191
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90116072A Pending EP0414217A1 (en) | 1989-08-22 | 1990-08-22 | Ignition distributor for combustion engines |
EP90912410A Expired - Lifetime EP0489056B1 (en) | 1989-08-22 | 1990-08-22 | Ignition distributor for internal combustion engines |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90116072A Pending EP0414217A1 (en) | 1989-08-22 | 1990-08-22 | Ignition distributor for combustion engines |
Country Status (5)
Country | Link |
---|---|
US (1) | US5416292A (en) |
EP (2) | EP0414217A1 (en) |
JP (1) | JPH05503128A (en) |
DE (2) | DE8910037U1 (en) |
WO (1) | WO1991002899A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5679471A (en) * | 1995-10-16 | 1997-10-21 | General Motors Corporation | Silver-nickel nano-composite coating for terminals of separable electrical connectors |
US5967860A (en) * | 1997-05-23 | 1999-10-19 | General Motors Corporation | Electroplated Ag-Ni-C electrical contacts |
Family Cites Families (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR502536A (en) * | 1918-10-01 | 1920-05-18 | Scintilla Soc | Distributor for high voltage current in ignition magnetos |
FR525168A (en) * | 1920-09-28 | 1921-09-16 | Charles Low Atkinson | Improvements in switches for internal combustion engines |
US3542976A (en) * | 1967-08-18 | 1970-11-24 | Forest J Moray | Distributor cap and rotor combination with completely removable stationary electrode and broad contact face movable electrode |
US3504141A (en) * | 1969-03-24 | 1970-03-31 | Millard A Webster | Rotary distributor |
FR2133120A5 (en) * | 1971-04-08 | 1972-11-24 | Ducellier & Cie | |
JPS5171445U (en) * | 1974-11-30 | 1976-06-05 | ||
DE2846590A1 (en) * | 1978-10-26 | 1980-05-08 | Bosch Gmbh Robert | ARRANGEMENT FOR IGNITION VOLTAGE DISTRIBUTION IN IGNITION SYSTEMS OF INTERNAL COMBUSTION ENGINES |
DE2949573C2 (en) * | 1978-12-11 | 1982-06-03 | Hitachi, Ltd., Tokyo | Ignition distributor |
US4308436A (en) * | 1978-12-28 | 1981-12-29 | Hitachi, Ltd. | Distributor for internal combustion engine |
JPS55144855U (en) * | 1979-04-03 | 1980-10-17 | ||
EP0045052B1 (en) * | 1980-07-25 | 1986-02-26 | Nissan Motor Co., Ltd. | Radio frequency interference suppressing ignition distributor rotor |
JPS5756665A (en) * | 1980-09-22 | 1982-04-05 | Toyota Motor Corp | Noise wave generation restraining distributor of internal combustion engine |
DE3101908A1 (en) * | 1981-01-22 | 1982-09-02 | Robert Bosch Gmbh, 7000 Stuttgart | Ignition distributor for internal-combustion engines |
DE3136745A1 (en) * | 1981-09-16 | 1983-03-31 | Robert Bosch Gmbh, 7000 Stuttgart | DEVICE FOR DISTRIBUTING VOLTAGE DISTRIBUTION IN COMBINED IGNITION SYSTEMS FOR INTERNAL COMBUSTION ENGINES |
DE3148053A1 (en) * | 1981-12-04 | 1983-06-09 | Robert Bosch Gmbh, 7000 Stuttgart | IGNITION DEVICE FOR INTERNAL COMBUSTION ENGINES |
US4470385A (en) * | 1982-09-20 | 1984-09-11 | General Motors Corporation | Ignition distributor |
DE3613499A1 (en) * | 1985-05-02 | 1986-11-06 | Volkswagen AG, 3180 Wolfsburg | Ignition distributor for a cam-controlled internal combustion engine |
US4661661A (en) * | 1985-10-01 | 1987-04-28 | Chrysler Motors Corporation | Spark shield and inlet air vent for an ignition distributor |
DE3807791A1 (en) * | 1987-02-20 | 1988-09-22 | Mitsubishi Electric Corp | Ignition distributor for an internal-combustion engine |
DE3743940A1 (en) * | 1987-12-23 | 1989-07-06 | Bayerische Motoren Werke Ag | Ignition distributor for internal combustion engines |
DE3821995A1 (en) * | 1988-06-30 | 1990-01-11 | Bosch Gmbh Robert | HIGH VOLTAGE DISTRIBUTOR FOR IGNITION SYSTEMS FOR INTERNAL COMBUSTION ENGINES |
DE3837808A1 (en) * | 1988-11-08 | 1990-05-10 | Bosch Gmbh Robert | IGNITION DISTRIBUTOR FOR IGNITION SYSTEMS FOR INTERNAL COMBUSTION ENGINES |
-
1989
- 1989-08-22 DE DE8910037U patent/DE8910037U1/de not_active Expired - Lifetime
-
1990
- 1990-08-22 DE DE59007467T patent/DE59007467D1/en not_active Expired - Fee Related
- 1990-08-22 WO PCT/EP1990/001395 patent/WO1991002899A1/en active IP Right Grant
- 1990-08-22 US US07/835,996 patent/US5416292A/en not_active Expired - Fee Related
- 1990-08-22 EP EP90116072A patent/EP0414217A1/en active Pending
- 1990-08-22 JP JP2511459A patent/JPH05503128A/en active Pending
- 1990-08-22 EP EP90912410A patent/EP0489056B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9102899A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE59007467D1 (en) | 1994-11-17 |
EP0489056B1 (en) | 1994-10-12 |
JPH05503128A (en) | 1993-05-27 |
WO1991002899A1 (en) | 1991-03-07 |
DE8910037U1 (en) | 1991-01-17 |
US5416292A (en) | 1995-05-16 |
EP0414217A1 (en) | 1991-02-27 |
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Legal Events
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