EP1899646A1 - Sheathed-element glow plug - Google Patents
Sheathed-element glow plugInfo
- Publication number
- EP1899646A1 EP1899646A1 EP06752572A EP06752572A EP1899646A1 EP 1899646 A1 EP1899646 A1 EP 1899646A1 EP 06752572 A EP06752572 A EP 06752572A EP 06752572 A EP06752572 A EP 06752572A EP 1899646 A1 EP1899646 A1 EP 1899646A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- glow plug
- housing
- circuit carrier
- plug according
- connection element
- 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
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
- F23Q7/001—Glowing plugs for internal-combustion engines
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
Definitions
- the invention relates to a glow plug for arrangement in a chamber of an internal combustion engine. Specifically, the invention relates to a glow plug for air compressing, self-igniting internal combustion engines.
- the known glow plug comprises a ceramic heater, which is electrically connected on the one hand with the housing and on the other hand with a connecting bolt. By applying a voltage to the terminal bolt, the ceramic heater is heated, whereby an air flowing past the heater can be heated.
- the glow plug according to the invention with the features of claim 1 has the advantage that the circuit carrier allows the assembly of active and passive components within the housing of the glow plug to allow functions that go beyond the usual operation of the glow plug.
- the handling of the glow plug can be simplified, damage to the glow plug due to improper startup can be prevented and / or the glow plug can be used for additional tasks.
- the components arranged within the housing are protected from the environment.
- the circuit carrier is oriented in the direction of an axis of the housing. Furthermore, it is advantageous that the circuit carrier is configured flat in the direction of the axis of the housing. This has the advantage that the circuit board can be integrated to save space in the housing of the glow plug. This can also be done be avoided that the size of the glow plug is increased compared to a conventional glow plug.
- the circuit carrier has an annular base body which encloses the connection element.
- the connecting element can thereby serve both for contacting the circuit carrier and for contacting the radiator, so that the number of parts required for the construction of the glow plug is reduced.
- the main body can be designed, for example, hollow cylindrical.
- the circuit carrier has a first resilient contact element, which establishes an electrical connection with the housing, and a second resilient contact element, which produces an electrical connection with the connection element.
- a resilient contact element can be constructed for example by a spring ring, a snap ring and / or resilient contact plates. This creates a secure way of contacting.
- this contacting has the advantage that the circuit carrier can be easily pushed over the connection element, in particular the connection pin, whereby the assembly of the glow plug is simplified.
- the circuit carrier can accommodate one or more components, in particular semiconductor elements. In this case, solder joints and / or bonding wire connections can be provided.
- the circuit carrier may have a voltage limiting element which limits a voltage that can be applied to the heating element in order to prevent damage to the heating element during operation of the glow plug. Especially during maintenance, service or For example, there is a risk that due to carelessness or due to a lack of knowledge, a wrong operation, in particular test operation, is performed, which can result in damage to the glow plug. By the voltage limiting element, the operating voltage of the glow plug can be effectively limited to ensure safe protection against possible damage.
- the circuit carrier may also have one or more sensor elements.
- the sensor element for example, a resistance measurement can be performed, which allows conclusions about the functionality of the glow plug and the current operating conditions. This allows a reliable operation of the internal combustion engine, with possible malfunctions can be displayed and located immediately. The maintenance of the internal combustion engine is thereby considerably simplified. Damage to functioning glow plugs due to improper inspection is thereby avoided from the outset.
- the circuit carrier may be provided with a protective compound which surrounds the components, bonding wire connections and other components.
- Fig. 2 shows the circuit carrier of a glow plug according to a first preferred embodiment of the invention
- FIG 3 shows a circuit carrier of a glow plug according to a second preferred embodiment of the invention.
- Fig. 1 shows an embodiment of a glow plug 1 in a schematic representation.
- the glow plug 1 can be configured in particular as a glow plug 1 for an air-compressing, self-igniting internal combustion engine.
- a radiator 2 of the glow plug 1 protrudes in operation with its chamber-side end 3 at least partially into a chamber of the internal combustion engine.
- the radiator 2 can protrude in Vor- and swirl chamber in pre and vortex chamber engines and direct injection engines in the combustion chamber of the engine.
- the glow plug 1 according to the invention is also suitable for other applications.
- the glow plug 1 has a housing 4, which preferably consists of a metallic material. On the housing 4, an external thread 5 is formed, with which the glow plug 1 in a bore of the internal combustion engine or the like can be screwed.
- the ceramic heater 2 of the glow plug 1 has a first current-carrying layer 6, a second current-carrying layer 7 and an electrically insulating insulating layer 8 arranged between the current-carrying layers 6, 7. At the chamber end 3 the current-carrying layers 6, 7 are connected to one another via a heating element 9.
- the current-carrying layers 6, 1 and the insulating layer 8 form a circumferential, cylindrical projection, which serves for fastening the radiator 2 in the housing 4.
- an electrically conductive sealant 11 is provided, via which the first current-carrying layer 6 is connected to the housing 4. The sealant 11 also seals the interior of the housing 4 of the glow plug 1 from the chamber.
- the glow plug 1 also has a connecting pin 15 designed as a connecting element 15, which is partially guided by the housing 4.
- the connection element 15 is connected at a chamber-distal end 16 of the glow plug 1 to a connection device 17, to which an electrical supply line can be connected.
- the housing 4 is grounded (0 V), so that an operating voltage to ground can be applied to the connecting device 17.
- the connecting element 15 has a cylindrical contact part 18, which is electrically contacted via a spring element 19 with the second current-carrying layer 7 of the radiator 2.
- the selective contacting of the first current-carrying layer 6 and the second current-carrying layer 7 may be effected via contact elements attached to the current-carrying layers 6, 7, wherein the remaining surface of the heating element 2 may be at least partially provided with an insulating layer.
- a clamping sleeve 20 surrounding the contact part 18 and the spring element 19 a clamping sleeve 21 surrounding the connecting element 15 in sections, and a clamping sleeve 22 surrounding the connecting element 15 in sections are provided in the interior of the housing 4.
- the clamping sleeve 20 rests on the one hand on the chamber distal end 10 of the radiator 2 and on the other hand on the clamping sleeve 21 at.
- an electrically insulating sealing element 23 is provided which mechanically connects the connection device 17 to the housing 4 and ensures a seal in the region of the chamber-distal end 16 of the housing 4.
- a hollow-cylindrical pressure element 24 is also provided, which is hineinschiebbar by means of the connecting device 17 in the interior of the housing 4.
- a circuit carrier 25 is provided, which is mechanically fixed by the clamping sleeves 21, 22.
- a certain bias voltage can be ensured by the pressure element 24 over the life of the glow plug 1.
- the circuit carrier 25 is electrically contacted on the one hand with the connection device 15 and on the other hand with the housing 4. This electrical contact can be done directly, via electrical contact elements, coatings or other elements.
- the circuit carrier 25 is acted upon in addition to the radiator 2 with the operating voltage.
- the circuit carrier 25 can be pushed over the connection element 15 in the housing 4 of the glow plug.
- circuit carrier 25 will be described in more detail below with reference to Figures 2 and 3.
- FIG. 2 shows the circuit carrier 25 of a glow plug 1 according to a first preferred embodiment of the invention. Already described elements are provided in this and in all other figures with matching reference numerals, whereby a repetitive description is unnecessary.
- the circuit carrier 25 shown in Fig. 2 has a base body 30, which may consist of various insulating materials, which have a sufficient strength and temperature resistance.
- the base body 30 may be formed of a ceramic, a plastic or a micro-hybrid.
- the main body 30 is configured annular.
- the main body 30 may also have another shape, for example a polygonal shape, in particular a hexagonal or octagonal shape. Accordingly, a central recess 31 of the base body 30 in place of illustrated cylindrical configuration have a polygonal configuration.
- the recess 31 is adapted to the geometry of the connecting element 15.
- a plurality of components 32, 33, 34 are provided, which are contacted via conductor track sections 35a, 35b, 35c, 35d.
- the conductor track section 35a is electrically connected to a contact element 36.
- the conductor track section 35d is connected to a contact element 37.
- the contact element 36 is directed towards the recess 31 of the main body 33 and protrudes slightly into the recess 31.
- the contact element 37 is outwardly slightly beyond the main body 30 of the circuit substrate 25, so that upon insertion of the main body 30 of the circuit substrate 25 in the housing 4, an electrical contact between the contact element 37 and an inner wall of the housing 4 of the glow plug 1 is created.
- the contact element 37 is also designed resiliently.
- the conductor track portion 35d is connected via the contact element 37 to ground.
- the conductor track portion 35a is connected via the contact element 36 with the connecting device 17, so that when applying an operating voltage to the glow plug 1, an action of the in Fig. 2 connected in series components 32, 33, 34 takes place.
- a voltage limit can be achieved, which limits the voltage applied to the glow plug 1 voltage upwards.
- the components 32, 33, 34 and operating variables of the glow plug 1 are detected, for example, the instantaneous electrical resistance of the radiator 2, in particular of the heating element.
- spring elements 38a, 38b, 38c are provided, each projecting slightly beyond the main body 30 to the outside and in the assembled state of the glow plug 1 at the Inner wall of the housing 4 abut.
- spring elements 39a, 39b and 39c are provided, each projecting slightly into the recess 31 of the main body 30 and ensuring a centered and reliable connection of the circuit carrier 25 to the connection element 15.
- a spring ring 40 is provided which acts on the contact element 36 and the spring elements 39a, 39b, 39c with an additional spring force. This ensures reliable operation over the life of the glow plug 1.
- Fig. 3 shows a second preferred embodiment of a circuit substrate 25 of a glow plug 1 of the invention in a perspective view.
- a component 32 is shown, on the one hand via the conductor track portion 35a with the contact element 36 and on the other hand via the
- Track section 35d is electrically connected to the contact element 37.
- a protective compound 42 is applied over the entire surface, which also surrounds the component 32 mounted on the base body 30.
- the protective compound 42 is shown in Fig. 3 for simplicity of illustration only partially.
- the protective mass 42 is in this case also provided in the region of the contact elements 36, 37 and the conductor track sections 35a and 35d, so that the protective mass 42 has an annular configuration.
- the component 32 is therefore reliably protected by the protective compound 42.
- the component 32 can then also be configured as a housing-less component, in particular as a housing-less semiconductor.
- the component 32 may be configured, for example, as a limiter element 32.
- the device 32 may comprise a Zener diode and optionally a resistor.
- the circuit carrier 25 is oriented in the direction of an axis 43 of the glow plug, wherein the axis 43 is indicated in FIG. 3 by a dash-dotted line.
- the circuit carrier 25 is designed flat in the direction of the axis 43. That is, both the main body 30 and the protective ground 42 are designed flat, so that installation of the circuit substrate 25 in the housing 4 without a significant increase in the glow plug 1 is possible.
- the invention is not limited to the described embodiments. In particular, combinations of the embodiments described with reference to FIGS. 2 and 3 are possible.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200510029839 DE102005029839A1 (en) | 2005-06-27 | 2005-06-27 | glow plug |
PCT/EP2006/062146 WO2007000369A1 (en) | 2005-06-27 | 2006-05-09 | Sheathed-element glow plug |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1899646A1 true EP1899646A1 (en) | 2008-03-19 |
EP1899646B1 EP1899646B1 (en) | 2015-04-08 |
Family
ID=36636561
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06752572.5A Expired - Fee Related EP1899646B1 (en) | 2005-06-27 | 2006-05-09 | Sheathed-element glow plug |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1899646B1 (en) |
JP (1) | JP4778555B2 (en) |
CN (1) | CN101208560B (en) |
DE (1) | DE102005029839A1 (en) |
WO (1) | WO2007000369A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010062443A1 (en) * | 2010-12-06 | 2012-06-06 | Robert Bosch Gmbh | Glow plug and method for its production |
DE102013201048B4 (en) * | 2013-01-23 | 2015-08-13 | Robert Bosch Gmbh | glow plug |
DE102013211789A1 (en) * | 2013-06-21 | 2014-12-24 | Robert Bosch Gmbh | Glow plug for annealing temperature control |
DE102013212298A1 (en) * | 2013-06-26 | 2014-12-31 | Robert Bosch Gmbh | glow plug |
DE102013225267B4 (en) * | 2013-12-09 | 2018-01-18 | Robert Bosch Gmbh | Glow plug with a glow element and a combustion chamber pressure sensor |
FR3021094A1 (en) * | 2014-05-13 | 2015-11-20 | Bosch Gmbh Robert | PREHEATING ELECTRODE WITH INSULATION SEAL |
FR3025153B1 (en) * | 2014-09-01 | 2016-12-09 | Bosch Gmbh Robert | GLOW PLUG |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4661686A (en) * | 1984-04-12 | 1987-04-28 | Ngk Spark Plug Co., Ltd | Dual line ceramic glow plug |
CN2128346Y (en) * | 1991-10-19 | 1993-03-17 | 大庆石油管理局第四采油厂 | Telescopic ignitor for gas boiler |
JP3794158B2 (en) * | 1998-03-25 | 2006-07-05 | 株式会社デンソー | Glow plug for ion current detection |
CN2354303Y (en) * | 1998-07-08 | 1999-12-15 | 苏文宏 | Electronic heating device |
DE19844347A1 (en) | 1998-09-28 | 2000-03-30 | Bosch Gmbh Robert | Ceramic glow plug |
DE10020328A1 (en) * | 1999-08-27 | 2001-03-01 | Bosch Gmbh Robert | Ceramic glow plug |
DE10028073C2 (en) * | 2000-06-07 | 2003-04-10 | Beru Ag | Method and circuit arrangement for heating a glow plug |
JP2002013735A (en) * | 2000-06-26 | 2002-01-18 | Bosch Automotive Systems Corp | Glow plug |
-
2005
- 2005-06-27 DE DE200510029839 patent/DE102005029839A1/en not_active Withdrawn
-
2006
- 2006-05-09 JP JP2008518771A patent/JP4778555B2/en not_active Expired - Fee Related
- 2006-05-09 WO PCT/EP2006/062146 patent/WO2007000369A1/en active Application Filing
- 2006-05-09 EP EP06752572.5A patent/EP1899646B1/en not_active Expired - Fee Related
- 2006-05-09 CN CN2006800228897A patent/CN101208560B/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2007000369A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1899646B1 (en) | 2015-04-08 |
WO2007000369A1 (en) | 2007-01-04 |
CN101208560A (en) | 2008-06-25 |
CN101208560B (en) | 2011-06-08 |
JP2008544210A (en) | 2008-12-04 |
JP4778555B2 (en) | 2011-09-21 |
DE102005029839A1 (en) | 2007-01-04 |
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