EP3014185A1 - Glühstiftkerze - Google Patents
GlühstiftkerzeInfo
- Publication number
- EP3014185A1 EP3014185A1 EP14734764.5A EP14734764A EP3014185A1 EP 3014185 A1 EP3014185 A1 EP 3014185A1 EP 14734764 A EP14734764 A EP 14734764A EP 3014185 A1 EP3014185 A1 EP 3014185A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- glow plug
- connecting bolt
- plug according
- housing
- ceramic heating
- 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
- 238000010438 heat treatment Methods 0.000 claims abstract description 47
- 239000000919 ceramic Substances 0.000 claims abstract description 45
- 238000002485 combustion reaction Methods 0.000 claims abstract description 5
- 239000011324 bead Substances 0.000 claims description 10
- 239000004020 conductor Substances 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 239000000843 powder Substances 0.000 description 5
- 238000005452 bending Methods 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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 relates to a glow plug for an internal combustion engine. State of the art
- EP 1 707 883 A1 discloses a glow plug with a ceramic heating pin and a connecting bolt, wherein the electrical contact between the connecting bolt and the ceramic heating pin takes place via an electrically conductive wire.
- the electrically conductive wire is embedded in an insulating powder to avoid a short circuit due to contact of the electrically conductive wire with the housing.
- an insulating powder is filled in the housing, which isolates the electrically conductive wire relative to the housing and thereby causes a mechanical stabilization of the wire against vibration.
- the glow plug according to the invention offers the advantage that it allows a simplified contacting of a ceramic glow pin, which can be produced easily and inexpensively waiving an insulating filler powder. Furthermore, the glow plug according to the invention is more robust against thermal and mechanical stress, since the connection via the contact element is more stable than the known wire connection. Due to the robust and rigid electrical connection between the connecting bolt and the ceramic heating pin, the filling of the housing of the glow plug with an insulating powder can be omitted, which saves at least one process step and thus significantly costs in the production and possibly accelerates the manufacturing process.
- the ceramic heating pin has a connection-side, the connecting bolt facing portion which has a reduced diameter compared to the remaining ceramic glow plug.
- reducing the diameter in this section is provided radially to the section space in the housing, so that increases the distance between the section and a housing wall or arranged in the housing support tube. The greater distance results in a more space for the lateral contacting of the second electrical contact point on the peripheral surface of the ceramic heating pin, and on the other hand, the increased distance from the risk of electrical short circuit or sparking between the contact element and the support tube and / or reduced the housing.
- a further advantageous development of the invention consists in that the connecting bolt has a bore in which the contact element is fixed.
- a hole is a simple and secure way to fix the contact element to the terminal bolt. It is particularly advantageous if the bore is centrally placed in a ceramic heating pin facing end face of the connecting bolt. Since the connecting bolt and the ceramic heating pin arranged centrally and coaxially in the housing of the glow plug are, the contact element can be screwed in any end position, whereby the assembly is simplified.
- the contact element has a radially resilient contact sleeve and a connection conductor. While the terminal conductor should be designed as stiff as possible to ensure precise fixation on the terminal bolt, the contact sleeve may be thinner and more flexible to allow better axial displacement with appropriate bias against the ceramic heating pin. By the radially resilient contact sleeve a secure sliding contact between the Kotaktelement and the second contacting point is made at the connection side portion of the heating pin. In addition, the contact sleeve is centered by the ceramic heating pin, in particular by the connection-side section, so that a certain flexibility must be maintained in the contact element to compensate for any offsets due to assembly, mechanical forces during operation and / or different thermal expansions of the components. It is particularly advantageous if the connection conductor is electrically conductively connected to a pin-shaped portion in the bore of the connecting bolt. This allows a secure, electrical connection between the connecting bolt and contact element can be realized.
- the contact sleeve of the contact element receives the ceramic heating pin, in particular the connection-side section with the second contacting point.
- the contact sleeve is slotted in the axial direction.
- an axial slit creates an axially displaceable clamping contact between the terminal-side portion of the ceramic heating pin and the contact element in the nature of said sliding contact. As a result, the electrical connection is maintained even with different thermal expansions between the components to be contacted.
- a further advantageous development is that a preferably circumferential recess is formed on the connecting bolt. Due to the fende depression, the insulating support element described below, but also sealing elements can be positively positioned on the connecting bolt.
- a further advantageous development consists in that a support tube is arranged between the housing and the ceramic heating pin, wherein the support tube extends coaxially with the housing on the inside to at least the level of the connecting bolt, and wherein an insulating support element is arranged between the support tube and the connecting bolt. Due to the insulating support element, the connecting bolt is fixed to the housing in the housing. Furthermore, the insulating support element ensures electrical insulation between the connecting bolt and the housing, which is a prerequisite for the abandonment of an insulating powder filled in the housing.
- an insulating support element is arranged between the housing and the connection bolt. This allows a glow plug according to the invention, which does not require a support tube, whereby the number of components is reduced.
- a bead is formed on the support tube or on the housing, wherein the bead presses the insulating support member against the terminal bolt.
- the insulating support member is at least partially positively fixed at its radially outer lateral surface, which inhibits slipping of the insulating support member.
- the bead is formed on the support tube or on the housing at the same height as the recess on the connecting bolt. Thus, a simple and secure fixation of the insulating support member is possible.
- a further advantageous development is that a support surface is formed on the connecting bolt, which is supported on the insulating support member.
- Fig. 1 shows a first embodiment of a glow plug according to the invention with a ceramic heating pin.
- Fig. 2 shows another embodiment of a glow plug according to the invention.
- FIGS. 3 a and 3b show an exemplary embodiment of the contact element from the exemplary embodiments according to FIG. 1 or FIG. 2.
- Fig. 1 the combustion chamber side portion of a glow plug according to the invention is shown.
- the glow plug has a housing 1, in which a connecting bolt 4 is arranged.
- the glow plug also has a ceramic heating pin 2, which is arranged concentrically to the connecting bolt 4 in extension of a central axis of the glow plug. In this case, a combustion chamber-side tip of the ceramic heating pin 2 protrudes beyond the housing 1.
- a support tube 3 is arranged, which is non-positively, positively and / or materially connected to the housing 1 and the ceramic heating pin 2.
- the connecting bolt 4 has at its the ceramic heating pin 2 facing end face a bore 9, in which a contact element 8 is fixed.
- the contact element 8 can in the bore 9 by means of soldering, welding or crimping elec- be used electrically conductive. But it is also conceivable to screw the contact element 8 in the bore 9.
- a first electrical contacting point 6 is present, which is electrically conductively connected via the support tube 3 to the housing 1 and serves for electrical connection to the negative pole. Furthermore, a connection-side section 5 is formed on the ceramic heating pin 2, wherein an end face of the connection-side section 5 is aligned in the direction of the connection pin 4. The connection-side section 5 has, for electrical connection to the positive pole, a second electrical contacting point 7, which lies on a peripheral surface of the connection-side section 5.
- connection-side section 5 with the second electrical contacting point 7 is designed as a cylindrical extension of the ceramic heating pin 2 and has a reduced diameter compared with the remaining ceramic heating pin 2.
- This embodiment is advantageous when the ceramic heating pin 2 is received in the support tube 3 in order to carry out a corresponding radial distance between the second electrical contacting point 7 and an inner wall of the support tube 3.
- the contact element 8 For electrical contacting of the second electrical contact point 7 with the terminal bolt 4, the contact element 8 is provided, which at one end with a radially resilient portion axially slidably connected on the connection-side section 5 with the second contact point 7 and at the other end fixed to the terminal bolt 4 is.
- the radially resilient portion of the contact element 8 forms on the connection-side section 5 of the heating pin 2 from a sliding contact. By means of the sliding contact length changes due to different thermal expansions are compensated.
- an electrically insulating support member 12 is arranged, which is fixed in the support tube 3. The fixation is carried out by means of a introduced in the support tube 3, circumferential bead 13 which presses in the elastically or plastically deformable support member 12.
- the connecting bolt 4 is fixed to the housing within the support tube 3.
- the contact element 8 has a radially resilient contact sleeve 8.1, which forms the radially resilient section, and a substantially rigid connection conductor 8.2.
- the connecting conductor 8.2 is bent, so that an electrical conductor from the diameter of the contact sleeve 8.1 towards the bore 9 of the connecting bolt 4 is formed.
- the connecting conductor 8.2 is inserted with a pin-shaped portion in the introduced at the ceramic heating pin 2 end face of the connecting bolt 4 bore 9, for example by means of soldering, welding or crimping electrically conductive.
- the contact sleeve 8.1 is slotted in the axial direction, so that a radially resilient bias can be applied. Due to the radial prestress, the contact sleeve 8.1 forms an axially displaceable clamping contact on the connection-side section 5 with the second electrical contact-making point 7 in the manner of said sliding contact. As a result, the electrical connection is maintained even with different thermal expansions between the components to be contacted.
- FIG. 2 an alternative embodiment of a glow plug according to the invention is disclosed.
- the exemplary embodiment according to FIG. 2 dispenses with a support tube 3. Accordingly, the first contacting point 6 of the ceramic heating pin 2 is connected directly to the housing 1. The electrical contacting of the negative pole thus takes place directly via the first contacting point 6 on the ceramic heating pin 2 and the housing 1. This results between ceramic heating pin 2 and housing, in particular in the region of the connection-side section 5 with the second electrical contacting 7 more space, so that can be dispensed with a diameter reduction of the ceramic heating pin 2 on the connection-side section 5.
- a collar 11 is formed on the connecting bolt 4, which is supported on a heating pin-side support surface on the insulating support member 12.
- the insulating support member 12 is disposed between the housing 1 and the terminal bolt 4, wherein the bead 13 is formed for fixing the insulating support member 12 on the housing 1 and produces an at least partially positive connection.
- About the collar 11 and the support surface of the connecting bolt 4 is locked by means of the housing-fixed, insulating support member 12 in the axial direction.
- the insulating support member 12 may be bonded to the support tube 3 or to the housing 1 for fixing, wherein the shown, at least partially positive connection via the bead 13 is preferred.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Resistance Heating (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013212260.8A DE102013212260A1 (de) | 2013-06-26 | 2013-06-26 | Glühstiftkerze |
PCT/EP2014/062876 WO2014206845A1 (de) | 2013-06-26 | 2014-06-18 | Glühstiftkerze |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3014185A1 true EP3014185A1 (de) | 2016-05-04 |
EP3014185B1 EP3014185B1 (de) | 2019-02-20 |
Family
ID=51062786
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14734764.5A Active EP3014185B1 (de) | 2013-06-26 | 2014-06-18 | Glühstiftkerze |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3014185B1 (de) |
JP (1) | JP6111379B2 (de) |
DE (1) | DE102013212260A1 (de) |
WO (1) | WO2014206845A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPWO2019004286A1 (ja) * | 2017-06-28 | 2019-12-12 | 京セラ株式会社 | ヒータ |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4475030A (en) * | 1981-09-25 | 1984-10-02 | Caterpillar Tractor Co. | Glow plug having resiliently mounted ceramic surface-ignition element |
US4661686A (en) * | 1984-04-12 | 1987-04-28 | Ngk Spark Plug Co., Ltd | Dual line ceramic glow plug |
JP4672910B2 (ja) * | 2001-06-07 | 2011-04-20 | 日本特殊陶業株式会社 | グロープラグの製造方法 |
JP4677140B2 (ja) * | 2001-08-13 | 2011-04-27 | 日本特殊陶業株式会社 | グロープラグ |
JP2003130349A (ja) * | 2001-10-24 | 2003-05-08 | Denso Corp | グロープラグ |
JP4172486B2 (ja) | 2003-12-19 | 2008-10-29 | ボッシュ株式会社 | セラミックスヒータ型グロープラグ |
JP4348317B2 (ja) * | 2004-06-29 | 2009-10-21 | 日本特殊陶業株式会社 | グロープラグ |
JP4996283B2 (ja) * | 2006-05-18 | 2012-08-08 | 日本特殊陶業株式会社 | セラミックヒータ及びグロープラグ |
JP5324905B2 (ja) * | 2008-12-11 | 2013-10-23 | 日本特殊陶業株式会社 | グロープラグ |
JP2011017478A (ja) * | 2009-07-08 | 2011-01-27 | Ngk Spark Plug Co Ltd | グロープラグ |
JP4851570B2 (ja) * | 2009-09-09 | 2012-01-11 | 日本特殊陶業株式会社 | グロープラグ |
DE102009048643B4 (de) * | 2009-09-30 | 2013-11-28 | Borgwarner Beru Systems Gmbh | Glühkerze und Verfahren zum Verbinden eines Stifts aus einer Funktionskeramik mit einer Metallhülse |
JP5552920B2 (ja) * | 2010-06-25 | 2014-07-16 | 株式会社デンソー | セラミックヒータ |
-
2013
- 2013-06-26 DE DE102013212260.8A patent/DE102013212260A1/de not_active Withdrawn
-
2014
- 2014-06-18 JP JP2016520473A patent/JP6111379B2/ja not_active Expired - Fee Related
- 2014-06-18 WO PCT/EP2014/062876 patent/WO2014206845A1/de active Application Filing
- 2014-06-18 EP EP14734764.5A patent/EP3014185B1/de active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2014206845A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102013212260A1 (de) | 2014-12-31 |
JP6111379B2 (ja) | 2017-04-05 |
JP2016525202A (ja) | 2016-08-22 |
EP3014185B1 (de) | 2019-02-20 |
WO2014206845A1 (de) | 2014-12-31 |
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