US20110240627A1 - Glow plug - Google Patents
Glow plug Download PDFInfo
- Publication number
- US20110240627A1 US20110240627A1 US13/069,043 US201113069043A US2011240627A1 US 20110240627 A1 US20110240627 A1 US 20110240627A1 US 201113069043 A US201113069043 A US 201113069043A US 2011240627 A1 US2011240627 A1 US 2011240627A1
- Authority
- US
- United States
- Prior art keywords
- glow
- glow plug
- pencil
- plug according
- housing
- 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.)
- Abandoned
Links
Images
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
Definitions
- the present invention aims at showing a way how the production a glow plug can be simplified.
- At least one section of the supply line is formed as a flexible metal tube.
- a flexible metal tube is able to adjust flexibly to the length to be bridged and can, therefore, compensate production-related length differences or changes in length the occurrence of which during operation is caused by thermal expansion. For this reason, a flexible metal tube can be used to replace the contact springs that are usually used as length compensation element and to simplify production.
- a flexible metal tube can be attached to a glow pencil with little effort by inserting one end of the glow pencil into the flexible metal tube and soldering it to the latter.
- the flexible metal tube can be easily attached to a connecting element, for example, by inserting the flexible metal tube into a drilled hole of a connecting element and crimping it there, said connecting element being used to connect the glow plug to a voltage source.
- the flexible metal tube consists of wires, more particularly of metal wires which are interlaced or interwoven with each other.
- Flexible tubes consisting of interwoven or interlaced metal wires are, sometimes, referred to as metal fabric tubes. It is, for example, also possible to use wrapped tubes in the stead of metal fabric tubes, said wrapped tubes normally being produced by wrapping metal foil up onto a mandrel.
- the flexible tube is connected to a connecting element.
- the flexible tube is crimped to the connecting element but it can, for example, also be soldered or welded to the connecting element.
- the connecting element is enclosed by a plastic body which electrically insulates the connecting element against the housing.
- the plastic body can be injection-molded around the connecting element in a cost-effective manner.
- the connecting element is held non-rotatably in the plastic body by a form closure.
- the connecting element can have projections and/or recesses at an enclosed section, said projections and/or recesses causing a form closure with the plastic body. It is particularly advantageous to interlock the plastic body with the connecting element.
- the plastic body is held non-rotatably in the housing by a form closure.
- the plastic body can, advantageously, be pressed into the housing. Since the housing has one or more projections, more particularly projections that extend in longitudinal direction, on its inner side, a form closure can also be generated during pressing-in in addition to a force closure.
- the plastic body is interlocked with the housing.
- a glow plug according to the invention has a ceramic glow pencil, but it can also have a glow pencil that is made of metal, more particularly of steel.
- the advantage of a simple length compensation by means of a flexible metal tube is of particular importance for ceramic glow pencils because the latter are breakable.
- the advantage of a simple length compensation can already be utilized if the flexible metal tube forms only a section of the electrical supply line running to the glow pencil. It is, however, preferred that the flexible metal tube forms the supply line between the glow pencil and a connecting element at the rear end of the glow plug,
- FIG. 1 is a partially sectional view of an exemplary embodiment of a glow plug according to the invention.
- FIG. 2 is an exploded view of the glow plug.
- the glow plug shown in FIGS. 1 and 2 comprises a housing 1 with a thread 9 and an external polygon 10 , preferably an external hexagon.
- a ceramic glow pencil 2 projects from the forward end of the housing.
- the glow plug can be connected to a voltage source via a connecting element 3 which, in the illustrated exemplary embodiment, projects from the rear end of the housing 1 . Ground connection is achieved via the housing 1 .
- the glow pencil 2 is electrically connected to the connecting element 3 via a supply line which is enclosed by the housing 1 .
- a special feature of the glow plug shown is that at least one section of this supply line is formed as a flexible metal tube 4 .
- the flexible metal tube 4 consists of wires that are interlaced with each other for which reason it is bendable, with the result that it can act as a length compensation element between the glow pencil 2 and the connecting element 3 for compensating production tolerances or for compensating thermally caused changes in length.
- the glow pencil 2 is tapered at its rear end and projects into the flexible metal tube 4 with the tapering section.
- the flexible metal tube 4 is soldered to the glow pencil 2 , for example, by means of a solder wrap 5 .
- the end of the flexible metal tube 4 that is facing away from the glow pencil 2 can be connected to a section of the supply line, for example, by crimping or soldering.
- the flexible metal tube is inserted into a drilled hole of the connecting element 3 and is crimped there.
- the flexible metal tube 4 is enclosed by an electrical insulation 6 .
- the electrical insulation 6 can, for example, be wrapped around the flexible metal tube 4 as a foil.
- the insulation 6 is an insulating tube which encloses the flexible metal tube 4 .
- the connecting element 3 is enclosed by a plastic body 7 which is pressed into the housing 1 .
- the plastic body 7 was produced by injection-molding around the connecting element 3 .
- the section of the connecting element 3 which is enclosed by the plastic body 7 , has elevations and recesses on its outside, said elevations and recesses not being shown.
- the connecting element 3 is, therefore, held non-rotatably in the plastic body 7 by a form closure.
- the outer contour of the connecting element 3 which is enclosed by the plastic body 7 , can, for example, be formed as a series of tooth grooves extending in longitudinal direction, with the result that the plastic body is interlocked with the connecting element 3 .
- the plastic body 7 can be held non-rotatably in the housing 1 by a similar form closure.
- fins or other elevations extending in longitudinal direction are provided on the inner side of the housing 1 , said fins or other elevations cutting into the plastic body 7 while the latter is being pressed in and producing a non-rotatable form closure.
- the plastic body 7 is flanged into the housing 1 . Therein, a flange edge 8 of the housing 1 engages around the plastic body 7 .
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Resistance Heating (AREA)
Abstract
The invention relates to a glow plug comprising a housing, a glow pencil projecting from the housing, and a supply line which is enclosed by the housing and connected to the glow pencil. According to the invention, it is provided that at least one section of the supply line is formed as a flexible metal tube.
Description
- The present invention aims at showing a way how the production a glow plug can be simplified.
- In a glow plug according to the invention, at least one section of the supply line is formed as a flexible metal tube. This allows implementing a length compensation element between the glow pencil and an electrical connection of the glow plug in a cost-effective manner. A flexible metal tube is able to adjust flexibly to the length to be bridged and can, therefore, compensate production-related length differences or changes in length the occurrence of which during operation is caused by thermal expansion. For this reason, a flexible metal tube can be used to replace the contact springs that are usually used as length compensation element and to simplify production. Furthermore, a flexible metal tube can be attached to a glow pencil with little effort by inserting one end of the glow pencil into the flexible metal tube and soldering it to the latter. In addition, the flexible metal tube can be easily attached to a connecting element, for example, by inserting the flexible metal tube into a drilled hole of a connecting element and crimping it there, said connecting element being used to connect the glow plug to a voltage source.
- Preferably, the flexible metal tube consists of wires, more particularly of metal wires which are interlaced or interwoven with each other. Flexible tubes consisting of interwoven or interlaced metal wires are, sometimes, referred to as metal fabric tubes. It is, for example, also possible to use wrapped tubes in the stead of metal fabric tubes, said wrapped tubes normally being produced by wrapping metal foil up onto a mandrel.
- An advantageous further development of the invention provides that, at its end facing away from the glow pencil, the flexible tube is connected to a connecting element. Preferably, the flexible tube is crimped to the connecting element but it can, for example, also be soldered or welded to the connecting element.
- Another advantageous further development of the invention provides that the connecting element is enclosed by a plastic body which electrically insulates the connecting element against the housing. The plastic body can be injection-molded around the connecting element in a cost-effective manner.
- Preferably, the connecting element is held non-rotatably in the plastic body by a form closure. To achieve this, the connecting element can have projections and/or recesses at an enclosed section, said projections and/or recesses causing a form closure with the plastic body. It is particularly advantageous to interlock the plastic body with the connecting element.
- Preferably, the plastic body is held non-rotatably in the housing by a form closure. The plastic body can, advantageously, be pressed into the housing. Since the housing has one or more projections, more particularly projections that extend in longitudinal direction, on its inner side, a form closure can also be generated during pressing-in in addition to a force closure. Most preferably, the plastic body is interlocked with the housing.
- Preferably, a glow plug according to the invention has a ceramic glow pencil, but it can also have a glow pencil that is made of metal, more particularly of steel. The advantage of a simple length compensation by means of a flexible metal tube is of particular importance for ceramic glow pencils because the latter are breakable.
- In a glow plug according to the invention, the advantage of a simple length compensation can already be utilized if the flexible metal tube forms only a section of the electrical supply line running to the glow pencil. It is, however, preferred that the flexible metal tube forms the supply line between the glow pencil and a connecting element at the rear end of the glow plug,
- Further details and advantages of the invention will be illustrated by means of an exemplary embodiment with reference being made to the accompanying drawings. In the drawings,
-
FIG. 1 is a partially sectional view of an exemplary embodiment of a glow plug according to the invention; and -
FIG. 2 is an exploded view of the glow plug. - The glow plug shown in
FIGS. 1 and 2 comprises ahousing 1 with athread 9 and anexternal polygon 10, preferably an external hexagon. Aceramic glow pencil 2 projects from the forward end of the housing. The glow plug can be connected to a voltage source via a connectingelement 3 which, in the illustrated exemplary embodiment, projects from the rear end of thehousing 1. Ground connection is achieved via thehousing 1. - The
glow pencil 2 is electrically connected to the connectingelement 3 via a supply line which is enclosed by thehousing 1. A special feature of the glow plug shown is that at least one section of this supply line is formed as aflexible metal tube 4. Theflexible metal tube 4 consists of wires that are interlaced with each other for which reason it is bendable, with the result that it can act as a length compensation element between theglow pencil 2 and the connectingelement 3 for compensating production tolerances or for compensating thermally caused changes in length. - The
glow pencil 2 is tapered at its rear end and projects into theflexible metal tube 4 with the tapering section. Theflexible metal tube 4 is soldered to theglow pencil 2, for example, by means of asolder wrap 5. - The end of the
flexible metal tube 4 that is facing away from theglow pencil 2 can be connected to a section of the supply line, for example, by crimping or soldering. Preferably, the flexible metal tube is inserted into a drilled hole of the connectingelement 3 and is crimped there. However, it is also possible to push the flexible metal tube onto an appropriately shaped section of the supply line, for example, a pin-shaped end of the connectingelement 3. - The
flexible metal tube 4 is enclosed by anelectrical insulation 6. Theelectrical insulation 6 can, for example, be wrapped around theflexible metal tube 4 as a foil. Preferably, theinsulation 6 is an insulating tube which encloses theflexible metal tube 4. - The connecting
element 3 is enclosed by aplastic body 7 which is pressed into thehousing 1. Theplastic body 7 was produced by injection-molding around the connectingelement 3. The section of the connectingelement 3, which is enclosed by theplastic body 7, has elevations and recesses on its outside, said elevations and recesses not being shown. The connectingelement 3 is, therefore, held non-rotatably in theplastic body 7 by a form closure. The outer contour of theconnecting element 3, which is enclosed by theplastic body 7, can, for example, be formed as a series of tooth grooves extending in longitudinal direction, with the result that the plastic body is interlocked with theconnecting element 3. - The
plastic body 7 can be held non-rotatably in thehousing 1 by a similar form closure. To achieve this, fins or other elevations extending in longitudinal direction are provided on the inner side of thehousing 1, said fins or other elevations cutting into theplastic body 7 while the latter is being pressed in and producing a non-rotatable form closure. - The
plastic body 7 is flanged into thehousing 1. Therein, aflange edge 8 of thehousing 1 engages around theplastic body 7. -
- 1 Housing
- 2 Glow pencil
- 3 Connecting element
- 4 Flexible metal tube
- 5 Solder wrap
- 6 Insulation
- 7 Plastic body
- 8 Flange edge
- 9 Thread
- 10 External polygon
Claims (12)
1. A glow plug, comprising:
a housing;
a glow pencil projecting from the housing; and
a supply line for connecting the glow pencil to a voltage source, the supply line being enclosed by the housing and connected to the glow pencil, wherein at least one section of the supply line is formed as a flexible metal tube.
2. The glow plug according to claim 1 , wherein the flexible metal tube is comprised of wires.
3. The glow plug according to claim 1 , wherein the glow pencil projects into the flexible tube.
4. The glow plug according to claim 1 , wherein the flexible tube is soldered to the glow pencil.
5. The glow plug according to claim 1 , wherein the flexible tube, at an end facing away from the glow pencil, is connected to a connecting element.
6. The glow plug according to claim 5 , wherein the connecting element is enclosed by a plastic body.
7. The glow plug according to claim 6 , wherein the plastic body is held non-rotatably in the housing by a form closure.
8. The glow plug according to claim 6 , wherein the connecting element is held non-rotatably in the plastic body by a form closure.
9. The glow plug according to claim 1 , wherein the glow pencil is a ceramic glow pencil.
10. The glow plug according to claim 1 , wherein the flexible metal tube is enclosed by an insulating tube.
11. The glow plug according to claim 1 , wherein the flexible metal tube bridges a gap between the glow pencil and a connecting element.
12. The glow plug according to claim 1 , wherein the housing is electrically connected to the glow pencil for providing a ground connection.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010013333A DE102010013333B4 (en) | 2010-03-30 | 2010-03-30 | glow plug |
DE102010013333.7 | 2010-03-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110240627A1 true US20110240627A1 (en) | 2011-10-06 |
Family
ID=44649965
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/069,043 Abandoned US20110240627A1 (en) | 2010-03-30 | 2011-03-22 | Glow plug |
Country Status (3)
Country | Link |
---|---|
US (1) | US20110240627A1 (en) |
CN (1) | CN102207295A (en) |
DE (1) | DE102010013333B4 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102538005A (en) * | 2012-02-09 | 2012-07-04 | 哈尔滨松江电炉厂有限责任公司 | Electrothermal igniter special for band steel zinc-plated furnace or continuous band steel annealing furnace |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040026399A1 (en) * | 2002-08-12 | 2004-02-12 | Ngk Spark Plug Co., Ltd. | Glow plug |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1475770U (en) * | ||||
GB166680A (en) * | 1920-04-17 | 1921-07-18 | Kenelm Edward Lee Guinness | Improvements in or relating to sparking plugs |
US2433081A (en) * | 1942-12-16 | 1947-12-23 | Howard M Wilkoff | Method of making ignition harness |
DE3837128C2 (en) * | 1987-11-05 | 1993-11-18 | Hitachi Metals Ltd | Glow plug for diesel engines |
CN2167204Y (en) * | 1993-05-11 | 1994-06-01 | 李桂芬 | Seal type electric heating means |
US6062185A (en) * | 1998-09-25 | 2000-05-16 | General Motors Corporation | Glow sensor and engine component combination |
CN100415061C (en) * | 2002-04-26 | 2008-08-27 | 日本特殊陶业株式会社 | Ceramic heater and glow plug having the same |
US7420139B2 (en) * | 2004-02-19 | 2008-09-02 | Ngk Spark Plug Co., Ltd. | Glow plug |
US7115836B2 (en) * | 2004-06-29 | 2006-10-03 | Ngk Spark Plug Co., Ltd. | Glow plug |
WO2008097227A2 (en) * | 2007-02-08 | 2008-08-14 | Wlodarczyk Marek T | Glow plug integrated pressure sensor improvements |
JP4386117B2 (en) * | 2007-08-30 | 2009-12-16 | 株式会社デンソー | Glow plug with combustion pressure sensor |
-
2010
- 2010-03-30 DE DE102010013333A patent/DE102010013333B4/en not_active Expired - Fee Related
-
2011
- 2011-03-22 US US13/069,043 patent/US20110240627A1/en not_active Abandoned
- 2011-03-29 CN CN2011100804818A patent/CN102207295A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040026399A1 (en) * | 2002-08-12 | 2004-02-12 | Ngk Spark Plug Co., Ltd. | Glow plug |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102538005A (en) * | 2012-02-09 | 2012-07-04 | 哈尔滨松江电炉厂有限责任公司 | Electrothermal igniter special for band steel zinc-plated furnace or continuous band steel annealing furnace |
Also Published As
Publication number | Publication date |
---|---|
DE102010013333B4 (en) | 2012-05-24 |
DE102010013333A1 (en) | 2011-10-06 |
CN102207295A (en) | 2011-10-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: BORGWARNER BERU SYSTEMS GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ELLER, MARTIN;ALLGAIER, MARTIN;SIGNING DATES FROM 20110211 TO 20110310;REEL/FRAME:025998/0740 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |