EP0943865A1 - A glow plug having a capsule and a fastening bush, in particular for diesel engines with deep wells - Google Patents
A glow plug having a capsule and a fastening bush, in particular for diesel engines with deep wells Download PDFInfo
- Publication number
- EP0943865A1 EP0943865A1 EP98830145A EP98830145A EP0943865A1 EP 0943865 A1 EP0943865 A1 EP 0943865A1 EP 98830145 A EP98830145 A EP 98830145A EP 98830145 A EP98830145 A EP 98830145A EP 0943865 A1 EP0943865 A1 EP 0943865A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- glow plug
- sheath element
- plug according
- capsule
- treaded
- 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
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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 has the object to provide a glow plug intended to be used in diesel engines with deep wells, which is more economical of a traditional glow plug and which maintains the manufacturing tolerances within much more restricted limits than the glow plugs of conventional design.
- the sheath element 24 and the tubular housing 22 are two separate parts of different materials, fixed to each other by driving with interference the sheath element 24 in the through cavity 34 of the tubular housing 22.
- the sheath element 24 is formed by a metallic alloy resistant to the temperature and to corrosive gas, for example INCONEL, while the tubular housing 22 is for example made of steel.
- the capsule 20 can be produced in a monolithic form, as disclosed in European Patent Application No. 97830307.1 of the same Applicant.
- the tubular housing 22 and the sheath element 24 are made of the same material and are formed starting from a monolithic piece by shaping operations, for example by swaging.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Resistance Heating (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Spark Plugs (AREA)
Abstract
Description
- The present invention relates to a glow plug for diesel engines, of the type comprising:
- a metallic body having a treaded portion for its engagement in a treaded portion of an engine head,
- a metallic sheath element projecting from one end of the body, and
- a heating resistor extending in said sheath element and having a first end connected to a power supply member extending through the body and a second end electrically connected to said sheath element.
- The new direct injection diesel engines require glow plugs with longer and longer bodies. This is due to the fact that the axis of the glow plug in these engines is parallel to the injector and the glow plug must cross substantially the whole thickness of the engine head. In the glow plugs of the most advanced type for pre-chamber engines, the cost of the body represents about 20% of the total cost of the glow plug. The increase of the cost of the body of the glow plug is proportional to its length and in the last type of plugs for direct injection diesel engines with deep wells the cost of the body represents about 50% of the total cost of the glow plug.
- In addition, with the increase of the length of the body there are always increasing difficulties for maintaining concentricity and coaxiality tolerances within the limits required by the automotive manufactures.
- The present invention has the object to provide a glow plug intended to be used in diesel engines with deep wells, which is more economical of a traditional glow plug and which maintains the manufacturing tolerances within much more restricted limits than the glow plugs of conventional design.
- According to the present invention, this object is achieved by a glow plug having the features forming the subject of the main claim.
- The present invention proposes to divide the body of the plug in two parts. A first part or lower part (capsule) has the function of supporting the sheath element and to avoid gas leaks from the combustion chamber. The second part or upper part (fastening bush) carries the treaded section necessary for engaging the treaded portion of the well and has only the function to push the lower section against the conical sealing end of the well and of holding the member for the power supply of the resistor which is housed in the lower portion.
- The solution according to the invention permits to obtain a reduction of the cost of very long bodies for glow plugs for applications in which the plug must be mounted in a very deep well.
- Furthermore, the invention permits to standardize the lower portion which together with the metallic sheath element forms a capsule which can be joined with upper portions of different dimensions. By providing only five or six different types of capsules it is possible to satisfy the functional and geometric requirements of the great majority of engines. The glow plug can be adapted to the particular type of engine by simply changing the upper portion.
- Another advantage of the present invention is the reduction of the cost of the resistor power supply member, which can be advantageously formed by a simple wire extending through the upper portion of the body.
- Further characteristics and advantages of the present invention will become clear in the course of the detailed description which follows, given purely by way of non-limiting example, with reference to the annexed drawings, in which:
- figure 1 is a partially sectioned lateral elevation view of a first embodiment of a glow plug according to the invention mounted in a well of an engine,
- figures 2 and 3 are partially sectioned lateral elevation view of the two parts which form the glow plug of figure 1,
- figure 4 is a partially sectioned lateral elevation view of a second embodiment of a plug according to the invention, and
- figures 5 and 6 are partially sectioned lateral elevation view of the two parts which form the plug of figure 4.
- With reference to figures 1 to 3, a glow plug for diesel engines is indicated at 10. The
plug 10 is intended to be mounted in a well 12 formed in ahead 14 of a diesel engine. Thewell 12 has two coaxialcylindrical portions 12a, 12b with a different diameter and connected to each other by a frusto-conical sealing surface 16. Thecylindrical portion 12a with greater diameter has atreaded section 18, for example in correspondence with the upper end of thewell 12. - The
glow plug 10 is formed by two distinct and separate parts. Thelower part 20 is a capsule including atubular housing 22 and asheath element 24. Within thesheath element 24 is a spiralelectric resistor 26 whose lower end is welded to the closedend 28 of thesheath element 24. Theresistor 26 may be formed for example by two spirals of different materials connected in series to each other, as is well known in the field. The upper section of theresistor 26 is connected to aterminal 30 formed by a small metallic pin which projects from the upper end of thesheath element 24 through aseal 32 of elastomeric material. Thesheath element 24, in a way per se known, is filed with an insulating powder for example of magnesium oxide. - In the example shown in the figures, the
sheath element 24 and thetubular housing 22 are two separate parts of different materials, fixed to each other by driving with interference thesheath element 24 in the throughcavity 34 of thetubular housing 22. Thesheath element 24 is formed by a metallic alloy resistant to the temperature and to corrosive gas, for example INCONEL, while thetubular housing 22 is for example made of steel. In a variant of the present invention, thecapsule 20 can be produced in a monolithic form, as disclosed in European Patent Application No. 97830307.1 of the same Applicant. In this case, thetubular housing 22 and thesheath element 24 are made of the same material and are formed starting from a monolithic piece by shaping operations, for example by swaging. - The
tubular housing 22 has an outercylindrical surface 36 with a diameter which is slightly less than the diameter of theportion 12a of thewell 12. Thecylindrical surface 36 finishes at its lower end with a frusto-conical surface 38 which is intended to be pushed against the corresponding frusto-conical surface 16 of thewell 12. - The
terminal 30 is electrically connected to apower supply member 40 formed for example by a wire, solid or plaited, which projects from the upper end of thecapsule 20. Thepower supply member 40 is connected to theterminal 30 by means of ametallic adapter 42 fixed to themember 40 and to theterminal 30 in any known manner, for example by welding or rolling. Thepower supply member 40 is insulated for example by a sheath of plastic or textile material. Thepower supply member 40 extends through aconnection element 44 fixed for example by means of atread 46 to the upper end of thetubular housing 22. Theconnection element 44 pushes downwardly aninsulating bush 48 for example made of ceramic material or of bakelized fabric which in its turn pushes an o-ring 50 against the outer surface of theadapter 42. The o-ring 50 has the object to prevent that liquid or dirt enter into contact with theheating element 24. Theconnection element 44 has ahole 52 through which extends thepower supply member 40. Theconnection element 44 has apin 54 provided with one or morelongitudinal slots 56 adapted to permit a radial deformation of thepin 54. Thepin 54 has a head with a frusto-conical surface 58 and a shank with anundercut portion 60. - The
glow plug 10 according to the present invention further comprises an upper portion formed by afixing bush 62 having a treadedportion 64 intended to engage the treadedportion 18 of thewell 12. Thefixing bush 62 has anhexagonal head 66 which can be engaged by a wrench for tightening or removing the plug from the engine head. Thefixing bush 62 has ahole 67 through which extends thepower supply member 40. On the upper end of thefixing bush 62 is preferably inserted asealing element 68 which acts on the outer surface of thepower supply member 40. The end of thepower supply member 40 which comes out from thefixing bush 62 is connected to an electrical connector (not shown) which serves for the connection of theglow plug 10 to a power supply cable. - The lower end of the
fixing bush 62 has anengagement seat 70 with an undercut shape having anentry aperture 72 smaller than the head of thepin 54 and slightly greater than the diameter of the shank of the pin. The head of thepin 74 is intended to snap-engage theseat 70, in order to connect to each other in an axial direction the two parts of theplug 10. - The
fixing bush 62 and thetubular housing 22 together form the body of theplug 10 which in the traditional solution is formed by a single component. - The glow plug according to the present invention can be supplied to the final user in an assembled configuration or with the two
parts pin 54 engaged into theseat 70. If the plug is supplied already assembled, fitting or removal thereof are carried out in the same manner as any other known plug. If the twoparts power supply member 40 through thehole 67 of thefixing bush 62. The two parts are then inserted in thewell 12 and theelement 62 is screwed by means of a normal wrench. The downward thrust of thefixing bush 62 provokes the snap engagement of thepin 54 in theseat 70 as well as an axial thrust which bring thecapsule 20 in abutment against the sealingconical surface 16 formed in thewell 12. When the plug must be removed by the well, by unscrewing thefixing bush 62 thecapsule 20 is extracted from thewell 12, by virtue of the engagement of thepin 54 in theseat 70. In figures 4 to 6 is shown a variant of the glow plug according to the present invention. The elements identical to the ones disclosed above are indicated with the same numeral references. - The main difference with respect to the previously disclosed embodiments consists in that the
pin 54 is carried by the fixingbush 62, while theengagement seat 70 is formed in thetubular housing 22 of thecapsule 20. Thepin 54 can be obtained in integral form with the fixingbush 62, as shown in figures 4 and 6. Thetubular housing 22 of thecapsule 20 has a treadedsection 74 in which is engaged abush 76 which has the object to press the o-ring 50 against theconnector 42. In the embodiment shown in figures 4 to 6, the wire forming thepower supply member 40 is welded to theconnector 42. In a further variant (not shown) could be used different systems for fixing the power supply wire to the terminal 30. For example, this connection could be carried out by means of a connector welded to theelectrode 30 and an electrical plug connected to thewire 40 and a plug electrically connected to thewire 40 and carried by the fixingbush 62.
Claims (9)
- A glow plug for diesel engines, comprising:a metallic body (22, 62) having a treaded portion (64) for its engagement within a treaded portion (18) of an engine head (14),a metallic sheath element (24) projecting from an end of the body (22, 62), anda heating resistor (26) extending within said sheath element (24) and having a first end electrically connected to a power supply member (40) which extends through the body (62, 22) and a second end electrically connected to said sheath element (24),
characterized in that said body is divided in two separated parts a first of which (22) is fixed to the sheath element (24) and a second of which (62) has said treaded portion (64). - A glow plug according to claim 1, characterized in that the first part (22) of the body has a cylindrical outer surface (36) terminating with a frusto-conical sealing zone (38) from which projects said sheath element (24).
- A glow plug according to claim 1, characterized in that the first and the second part of the body (22, 62) are provided with engagement means axially cooperating with each other for permitting the removal from a deep well of the first part of the body (22) by acting on the second part (62).
- A glow plug according to claim 3, characterized in that said engagement means comprise a coupling member (54) carried by one of the two parts of the body (22, 62) and adapted to engage a seat (70) provided on the other part (62, 22).
- A glow plug according to claim 4, characterized in that said coupling member comprises a radially deformable pin (54) having an undercut portion (60) which snap engages in a seat (70) with an undercut profile.
- A glow plug according to claim 1, characterized in that it comprises an electric terminal (30) projecting outside the sheath element 24 and connected to an insulated wire (40) which extends through a hole (67) of said second part (62) of the body.
- A glow plug according to claim 6, characterized in that said wire (40) is connected to the terminal (30) by means of an adapter (42) and in that it comprises a sealing element (50) arranged between the outer surface of said adapter (42) and the inner wall of the tubular housing (22).
- A glow plug according to claim 7, characterized in that it comprises a treaded element (44, 74) which exerts an axial thrust on said sealing element (50).
- A glow plug for diesel engines, characterized in that it comprises:a fixing bush (62) provided with a treaded section (64) for its engagement in a treaded portion (18) of an engine head, anda capsule (20) including a tubular housing (22) from which projects a metallic sheath element (24) containing a heating resistor (26),the fixing bush (62) and the capsule (20) being two separate components.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PT98830145T PT943865E (en) | 1998-03-16 | 1998-03-16 | INCANDESCENCE CANDLE WITH A CAPSULE AND A FIXING SLEEVE IN PARTICULAR FOR DIESEL ENGINES WITH FEW FUNDS |
EP98830145A EP0943865B1 (en) | 1998-03-16 | 1998-03-16 | A glow plug having a capsule and a fastening bush, in particular for diesel engines with deep wells |
DE29824933U DE29824933U1 (en) | 1998-03-16 | 1998-03-16 | Elongated glow plug for diesel engine with deep well in cylinder head |
AT98830145T ATE198930T1 (en) | 1998-03-16 | 1998-03-16 | Glow plug with socket and mounting sleeve, especially for diesel engines with deep bores |
DE69800508T DE69800508T2 (en) | 1998-03-16 | 1998-03-16 | Glow plug with socket and mounting sleeve, especially for diesel engines with deep holes |
ES98830145T ES2155714T3 (en) | 1998-03-16 | 1998-03-16 | AN INCANDESCENT SPARK PLUG WITH A CAPSULE AND A CLAMP, IN PARTICULAR FOR DIESEL ENGINES WITH DEEP DRILLS. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98830145A EP0943865B1 (en) | 1998-03-16 | 1998-03-16 | A glow plug having a capsule and a fastening bush, in particular for diesel engines with deep wells |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0943865A1 true EP0943865A1 (en) | 1999-09-22 |
EP0943865B1 EP0943865B1 (en) | 2001-01-24 |
Family
ID=8236573
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98830145A Revoked EP0943865B1 (en) | 1998-03-16 | 1998-03-16 | A glow plug having a capsule and a fastening bush, in particular for diesel engines with deep wells |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0943865B1 (en) |
AT (1) | ATE198930T1 (en) |
DE (1) | DE69800508T2 (en) |
ES (1) | ES2155714T3 (en) |
PT (1) | PT943865E (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0997687B1 (en) * | 1998-10-23 | 2004-03-17 | Beru AG | Tubular heating or measuring device |
DE10249408B4 (en) * | 2001-10-24 | 2010-01-21 | DENSO CORPORATION, Kariya-shi | Glow plug and corresponding manufacturing process |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19630208A1 (en) * | 1996-07-26 | 1998-01-29 | Bosch Gmbh Robert | Glow plug |
-
1998
- 1998-03-16 AT AT98830145T patent/ATE198930T1/en not_active IP Right Cessation
- 1998-03-16 EP EP98830145A patent/EP0943865B1/en not_active Revoked
- 1998-03-16 ES ES98830145T patent/ES2155714T3/en not_active Expired - Lifetime
- 1998-03-16 DE DE69800508T patent/DE69800508T2/en not_active Expired - Fee Related
- 1998-03-16 PT PT98830145T patent/PT943865E/en unknown
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19630208A1 (en) * | 1996-07-26 | 1998-01-29 | Bosch Gmbh Robert | Glow plug |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0997687B1 (en) * | 1998-10-23 | 2004-03-17 | Beru AG | Tubular heating or measuring device |
DE10249408B4 (en) * | 2001-10-24 | 2010-01-21 | DENSO CORPORATION, Kariya-shi | Glow plug and corresponding manufacturing process |
Also Published As
Publication number | Publication date |
---|---|
DE69800508T2 (en) | 2001-06-21 |
PT943865E (en) | 2001-05-31 |
EP0943865B1 (en) | 2001-01-24 |
ES2155714T3 (en) | 2001-05-16 |
DE69800508D1 (en) | 2001-03-01 |
ATE198930T1 (en) | 2001-02-15 |
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