DE102013222388A1 - Glow plug for diesel engines with extensive electrode - Google Patents

Abstract

Glow plug, comprising a tubular body (1) which terminates at one end (11) with a ceramic glow plug (2) and is provided with a connection bolt (3) at the other end (12). The annealing insert (22) is connected to the electrode (5) which runs through the tubular body (1) and has an extensible segment (52) between the annealing insert (22) and the constriction region (14) of the electrode (5). The electrode (5) is clamped in the body (1) through the constriction (14) by means of an insulating sleeve (6) on the knurled surface (53). The connecting bolt (3) is isolated from the body (1) by a sleeve (7).

Description

Field of the invention

• – einen rohrförmigen metallischen Körper, der an einem Ende mit einem Glühstift aus Keramik abschließt und am anderen Ende mit einem Anschlussbolzen versehen ist,
• – wobei der Glühstift den in der Keramik des Glüheinsatzes integrierten Heizleiter aufnimmt,
• – eine Elektrode, die den rohrförmigen Körper isoliert durchläuft und den Heizleiter des Glüheinsatzes und den Anschlussbolzen, der seinerseits im Endstück des rohrförmigen Körpers isoliert eingebaut ist, elektrisch miteinander verbindet.

The present invention relates to a glow plug for a diesel engine and comprises

• A tubular metallic body terminating at one end with a ceramic glow plug and provided at the other end with a terminal bolt,
• Wherein the glow plug accommodates the heat conductor integrated in the ceramic of the glow insert,
• - An electrode which passes through the tubular body isolated and the heating conductor of the glow insert and the connecting bolt, which in turn is installed in the end of the tubular body is electrically connected to each other.

State of the art

There are numerous designs of glow plugs of the type defined above.

According to a known embodiment, the glow plug consists of a tubular metallic body, wherein one end forms the glow plug and the other end is provided with a connecting bolt. In the vicinity of this end, the metallic body includes an external thread with which it is screwed into the cylinder head of the internal combustion engine, and at the other end a cone in order to position the glow plug in the combustion chamber.

Inside, the candle contains a central electrode in the form of a metal pin passing through the tubular body. This pin is connected at one end to the connecting bolt. At its other end it is connected by a screw connection with the end of the coiled electrical connection wire. The electrical connection wire is connected by a soldering fixed to the ceramic part. Furthermore, this solder joint ensures the power supply via one end of a metal filament integrated in the ceramic heating element. The other end of Metallglühfadens is connected via a second solder joint with the metallic protective tube of the glow plug for electrical ground return. All components are held in position by an insulating powder compressed in the protective tube. The electrical contact and the position are achieved by compressing this unit of tube / insulation powder around the bolted parts, that is, the spiral winding and the threaded part of the central electrode. The latter is in turn held in the protective tube by the compressed insulating powder and the gasket in isolation.

This known glow plug has the disadvantage that it is made of a relatively large number of components and requires a complex assembly, including the compaction of the insulating powder, so that the ceramic glow plug glow plug is ultimately costly.

Object of the invention

The object of the present invention is to produce a ceramic glow plug of a simple construction which can withstand the stresses of expansion and shrinkage due to the high temperature variations to which the candle is exposed, while at the same time simplifying and simplifying the construction and manufacture of the glow plug Costs are therefore reduced.

Disclosure and advantages of the invention

• – eine Elektrode mit mindestens einem extensiblen rohrförmigen Segment, das durch eine Folge von elastisch verformbaren Ringen, die durch Schlitze im rohrförmigen Segment hergestellt werden, gebildet wird,
• – wobei die Ringe jeweils durch einen Verbindungsbügel miteinander verbunden sind, der die Vorderseite eines Rings mit der Rückseite des vorhergehenden Ringes verbindet, wobei der Rest des Ringes einen elastisch verformbaren Bügel bildet,
• – wobei die Verbindungsbügel im Umfang von einem zum folgenden Ring versetzt sind.

For this purpose, the invention relates to a glow plug of the type defined above, which is characterized in that the conductor for supplying power to the glow insert comprises:

• An electrode having at least one extensible tubular segment formed by a series of elastically deformable rings formed by slots in the tubular segment,
• The rings are each connected to each other by a connecting bracket which connects the front side of a ring to the rear side of the preceding ring, the remainder of the ring forming an elastically deformable bracket,
• - Wherein the connecting straps are offset in scope from one to the next ring.

The glow plug is of a simple and efficient design due to the radial and axial damping element formed by the tubular extensible segment which can receive the heavy stresses imposed on the glow insert, these stresses being due to the combination of several phenomena. These are stresses that are due to the assembly and use in the operation of the diesel engine, in particular by the resulting during assembly centering error of the tube, by the assembly resulting tilt error of the tube, by the operating temperature-related expansion and shrinkage of the candle and the Vibrations to which it is exposed. The tubular extensible segment makes it possible to minimize the effect of these stresses in order to ensure the effectiveness of the electrical connection between the glow insert and the terminal bolt.

According to a further advantageous embodiment, a means for blocking the electrode is provided with which a portion of the electrode is blocked to the tubular body, wherein the extensible segment is located between the connection of the electrode with the glow insert and the means for blocking the electrode. This blocking agent ensures full effectiveness of the tubular extensible segment in the area most exposed to the stresses of abrupt and severe temperature variations between the glow insert and the metallic tubular body of the glow plug. This fixation of the tube and the electrode, thanks to an insulating sleeve which is compressed between the electrode and the tubular body, ensures the axial blocking as well as the blocking against rotation.

• – eine Rastfläche, die durch eine lokale Verformung der Oberfläche der Elektrode gebildet wird,
• – eine Isolationshülse, die mit der Rastfläche im Eingriff ist,
• – eine im rohrförmigen Körper ausgeführte Einschnürung, durch die die Hülse in die lokale Verformung der Rastfläche der Elektrode eingepresst wird, um den Einschnürungsbereich des rohrförmigen Körpers formschlüssig mit der Rastfläche der Elektrode zu verbinden.

According to a further advantageous embodiment, the means comprises for blocking the electrode

• A detent surface formed by a local deformation of the surface of the electrode,
• An insulating sleeve which is in engagement with the latching surface,
• - A running in the tubular body constriction, through which the sleeve is pressed into the local deformation of the locking surface of the electrode in order to connect the constriction region of the tubular body form-fitting manner with the latching surface of the electrode.

This embodiment of the blocking agent is particularly simple and effective.

According to a further advantageous embodiment, the extensible segment of the electrode is formed from a sequence of identical ring groups. The multiplication of angularly offset ring groups provides the extensible segment with high flexibility in all angular directions, thereby compensating for centering and tilting errors as well as length changes while dampening the vibrations of the engine, which in turn generally ensures the reliability of contact with the glowing insert.

According to a further advantageous embodiment, the rear end of the tubular metallic body comprises a countersink for receiving the outer surface of an insulating sleeve, whose inner surface receives the sleeve of the connecting bolt.

According to a further advantageous embodiment, the connecting bracket are offset in the circumference at an angle of 45 ° or 90 ° from one ring to the following ring at an angle to each other.

According to a further advantageous embodiment, the connecting straps have a shorter length than the non-deformable elastic strap.

According to a further advantageous embodiment, the connecting straps are identical from one ring to another.

In general, the cross-sectional area of the tie bars provides a virtually lossless current flow without the temperature rise due to the Joule effect, thus providing a simple design that somewhat corresponds to a helical spring integrated with the material of the tubular electrode itself and in a simple manner can be produced by slotted at an angle to each other in the circumference.

These different shapes imparted to the extensible segment are easy to perform in the tubular electrode of the glow plug.

• – die Elektrode mit einem extensiblen rohrförmigen Segment versehen wird, indem eine Folge von Ringen eingeschnitten wird, die durch die Ausführung von Schlitzen entstehen, welche in unterschiedlichen Richtungen um die Achse der Elektrode herum angeordnet sind, wodurch Verbindungsbügel gebildet werden, die im Umfang von einem Ring zum folgenden versetzt sind,
• – die Rändelung oder die Rastfläche nach dem extensiblen Segment in Richtung des hinteren Endes der Elektrode ausgeführt wird,
• – die Hülse auf die Rändelung der Elektrode aufgebracht wird,
• – der Einsatz im Mantel montiert wird, indem er durch eine Lötstelle fixiert wird, die gleichzeitig den elektrischen Kontakt zwischen dem Heizleiter und dem Mantel gewährleistet,
• – der Glüheinsatz durch eine Verbindung am vorderen Ende der Elektrode montiert wird,
• – der rohrförmige Körper montiert wird, indem er am breiten Bund angeschweißt wird, und anschließend die Elektrode unter Einfügung der Isolationshülse durch die Einschnürung des rohrförmigen Körpers auf der Rändelung der Elektrode blockiert wird,
• – die Einschnürung des rohrförmigen Körpers nach dem extensiblen Segment in Richtung des hinteren Endes der Elektrode erfolgt,
• – die Isolationshülse in der Senkung des hinteren Bereichs des rohrförmigen Körpers eingefügt wird und
• – die Hülse des Anschlussbolzens unter Einfügung der Isolationshülse gleichzeitig aufgepresst und der Stift des Anschlussbolzens in die Elektrode geklemmt wird.

The invention further has a method for producing a glow plug, as defined above, to the object, characterized in that

• The electrode is provided with an extensible tubular segment by incising a succession of rings formed by the execution of slots arranged in different directions about the axis of the electrode, thereby forming connecting straps which are in the circumference of one Ring are offset to the following,
• The knurling or the locking surface is carried out after the extensible segment in the direction of the rear end of the electrode,
• - The sleeve is applied to the knurling of the electrode,
• - The insert is mounted in the jacket by being fixed by a solder joint, which simultaneously ensures the electrical contact between the heating conductor and the jacket,
• The glow insert is mounted by a connection at the front end of the electrode,
• - The tubular body is mounted by being welded to the wide collar, and then the electrode is blocked with the insertion of the insulating sleeve by the constriction of the tubular body on the knurling of the electrode,
• The constriction of the tubular body occurs after the extensible segment towards the rear end of the electrode,
• - The insulating sleeve is inserted in the depression of the rear portion of the tubular body and
• - Press the sleeve of the connecting bolt while inserting the insulating sleeve simultaneously and clamp the pin of the connecting bolt into the electrode.

drawings

The present invention will be further described below by means of embodiments of a glow plug for diesel engines with reference to the accompanying drawings, in which

the 1 shows an axial section of the glow plug,

the 2 a detailed view of the conductor for the power supply of the glow element is,

the 3A shows a detailed view of the knurling of the electrode,

the 3B FIG. 12 is a detail view of the blocking / constricting portion of the electrode in the tubular body; FIG.

the 4 shows an enlarged view of the extensive segment of the electrode,

the 5 shows the front view of the successive rings which form part of the extensive segment and are shown after their orientation in the extensible segment,

the 6 shows another example of the rings of an extensible segment, these rings being shown in a different segment from the other in the extensible segment for ease of illustration.

Description of the embodiments of the invention

Usually, the directional term "front" or "rear" is used to simplify the description in the different figures, wherein on the figures "front" or "left" of the glow plug of the glow plug and "back" or "right" side of the Connecting bolt of the glow plug corresponds.

According to 1 the glow plug consists of a tubular body 1 in which an end 11 with a ceramic glow plug 2 and the other end 12 with a connecting bolt 3 connected is.

The cone 26 The glow plug ensures the centering and the tight fit in the cylinder head. The candle is made by screwing in the thread 13 held in position in the cylinder head of the engine, and due to the supernatant of the glow insert 22 to the cone 26 sticks out the glow tip 2 into the combustion chamber to ensure preheating. The connecting bolt 3 is connected via the Vorglühsteuerung not shown itself with the electrical system (not shown). These are well-known means which require neither a detailed description nor a specific presentation.

The glow tip 2 works as a heating resistor, on the one hand by the fit of the cone 26 in the cylinder head and also connected by its metal shell with the mass, the latter with the body 1 is electrically connected, which by its screw connection 13 in the cylinder head is also connected to the mass. The other end of the glow tip 2 is through the "+" conductor over the front connection 4 that the body 1 continuous electrode 5 and the connecting bolt 3 connected to the electrical system.

The glow tip 2 consists of a formed in the form of a finger metal shell 21 in which a ceramic glow insert 22 is stored, in which a ladder heating by the Joule effect 22 is integrated. The one at the level of the glowing insert 22 thin metal jacket 21 ends in a broad covenant 24 , the sealing cone 26 forms. The glowing insert 22 is through a connection 4 with the front end 51 an electrode 5 connected in the tubular body 1 is stored.

The electrode 5 is a metal tube with a round cross-section extending over the entire length of the tubular body 1 extends; she has a front end 51 for the connection 4 , an extensible segment 52 , a knurling 53 in middle position and closes with the rear end 54 off, that through a connection 6 with the connecting bolt 3 connected is.

The one from the front link 4 , the electrode 5 , the rear connection 6 and the connecting bolt 3 existing conductor path for the power supply of the glow insert 22 is in the middle by a blocking sleeve 7 and at the rear end through a cover sleeve 8th opposite the metal jacket 21 the glow tip 2 and opposite the tubular body 1 electrically isolated. The connecting bolt 3 will be in the back end 12 of the tubular body 1 taken electrically isolated, with an insulation sleeve 8th is inserted on the sleeve 31 which is in the sinking 17 the rear end 12 of the tubular body 1 pressed in and folded by the edge folded by crimping 18 is held. The outer surface 81 the insulation sleeve 8th gets to the bottom of the sinking 17 of the body 1 brought to a stop. The sleeve 31 of the connecting bolt 3 is on the inner surface 82 the insulation sleeve 8th mounted and pressed. This pressing creates a strong pressure between the shell 31 of the connecting bolt 3 and the inner surface 82 the insulation sleeve 8th , in turn, over the outer surface 81 Pressure on the diameter of the countersink 17 of the tubular body 1 exercises. By this compression are the connecting bolts 3 , the insulating sleeve 7 and the tubular body 1 absolutely tight.

The electrode 5 becomes in the tubular body 1 held in position by means for blocking (against translation and rotation). This agent consists of the insulating sleeve 7 caused by deformation of the tubular body 1 in the form of a constriction 14 on and in the knurling 53 is pressed. The knurling 53 generally represents an example of a detent surface caused by a local deformation of the surface of the electrode 5 is formed to the adhesion of the insulating sleeve 7 to enable.

The electrode 5 is not by their connection 4 in position or detained. The latter ensures only the electrical connection. To any movement or rotation of the electrode 5 To avoid this is through the insulation sleeve 7 and their constriction blocked. The insulation sleeve 7 consists of PA66, an electrically insulating, very pressure-resistant composite material. Before mounting the tubular body 1 becomes the sleeve 7 on the electrode 5 pressed and held by this and then by the deformation 14 of the tubular body 1 compressed. Due to this deformation of the material of the body 1 becomes the material of the sleeve 7 in the knurled area 53 pressed, causing the electrode 5 blocked there permanently. This fixation of the electrode 5 ensures two essential functions of the glow plug, namely their immobility in the area of the connection 4 and during the pressing of the pin of the connecting bolt 3 into the electrode 5 ,

The back end 54 the electrode 5 is with the connection bolt 3 connected, which consists of a sleeve 31 that exists with a pen 34 followed by a fret 32 and a connection foot 33 is provided.

The tubular body 1 is for screwing in the engine outside with a thread 13 provided, with its rear end 12 a tool approach 15 contains, for example in the form of a hex nut for screwing / unscrewing the glow plug in or out of the engine. The front part of the tubular body 1 is through a welded joint 16 with the covenant 24 of the metal mantle 21 of the glow plug 2 connected.

The extensible segment 52 allows extension, whereby the increase in the length is absorbed by the expansion due to the temperature rise of the glow plug during operation, so that the joint connection 4 between the rear portion of the ceramic part 22 and the front end 51 the electrode 5 is not subjected to tensile stress. This required excess length results in a simple manner from the geometric data of the glow plug and the thermal expansion coefficient of the materials used for the glow plug.

More specifically, the extensible segment ensures 52 at the same time, the damping of the expansion / contraction movements corresponding to the large variations in the axial length of the different components of the candle due to the expansion and contraction movements of these components enclosing and holding the elements of the inner circuit of the glow plug in position, that is, the connection between the end of the heating element 22 and the connecting bolt 3 , These very large expansions and shrinkages are due to the extreme temperature fluctuations that the glow plug undergoes during cold start and continuous operation of the engine. The extensible segment 52 allows not only the axial length changes, but also the radial stresses due to misalignment between the glow plug 2 and the electrode 5 and to compensate for the vibrations caused by engine operation in the glow plug.

The 4 shows the enlarged view of an example of an extensive segment 52 the tubular electrode 5 , which is shown at rest, that is in a de-energized state. The segment 52 is provided with slots F1-F4, which partially separate the rings A1-A4 formed in the material of the tube, thus forming a quasi spiral spring structure in the xx-axis.

• – die Vorderseite ist der sichtbare Teil des Ringes in 5,
• – die Rückseite ist der verdeckte Teil des Ringes, der in der Bildtafel von 5 nach hinten gedreht ist,
• – die Winkellage jedes Ringes entspricht der Ausrichtung im extensiblen Segment.

The 5 shows the sequence of the four rings A1-A4, the fictitious side by side and spatially with the same orientation as in the segment 52 being represented:

• - the front is the visible part of the ring in 5 .
• - the back is the hidden part of the ring in the picture panel of 5 turned backwards,
• - The angular position of each ring corresponds to the orientation in the extensible segment.

The front of each ring A1-A4 has a gray marked portion corresponding to a connecting bracket AL1-AL4, and the remainder of the front constitutes an elastic bracket AE1-AE4. The connecting brackets AL1-AL4 are in the tubular member according to their angular position 5 shown. It is the part of the wall of the tubular electrode 5 , each of one Slot F1-F4 is left. Because the cutting planes of the extensive segment 52 pass through the slots F1-F4, the material of the tubular electrode 5 cut according to the technical drawing rules and is shown in each case assigned to the front of the ring A1-A4.

The connecting brackets AL1-AL4 preferably have the same arc length, which also applies to the elastic brackets AE1-AE4, since the slots F1-F4 have the same depth in this example.

• – entspricht der Bügel AL1 der 0°-Stellung des Rings A1,
• – entspricht der Bügel AL2 der 180°-Stellung des Ringes A2,
• – entspricht der Bügel AL3 der 90°-Stellung des Ringes A3,
• – entspricht der Bügel AL4 der 270°-Stellung des Ringes A4.

After the 4 and 5

• The bracket AL1 corresponds to the 0 ° position of the ring A1,
• The bracket AL2 corresponds to the 180 ° position of the ring A2,
• The bracket AL3 corresponds to the 90 ° position of the ring A3,
• - The bracket AL4 corresponds to the 270 ° position of the ring A4.

• – der Ring A1 bleibt durch seinen Verbindungsbügel AL1 mit dem Rohr der Elektrode 5 verbunden; sein elastischer Bügel AE1 wird durch den Schlitz F1 vom Rohr 5 getrennt;
• – der Ring A2 bleibt durch seinen Verbindungsbügel AL2 mit der Rückseite des Ringes A1 in der dargestellten Winkellage verbunden; der Verbindungsbügel AL2 ist demnach mit der Rückseite des elastischen Bügels AE1 verbunden;
• – der Ring A3 ist durch seinen Verbindungsbügel AL3 mit der Rückseite des Ringes A2 in der dargestellten Winkellage verbunden, so dass der Verbindungsbügel AL3 mit der Rückseite des elastischen Bügels AE2 verbunden ist,
• – der Ring A4 ist durch seinen Verbindungsbügel AL3 mit der Rückseite des Rings A3 in der dargestellten Winkellage verbunden, so dass der Verbindungsbügel AL4 mit der Rückseite des elastischen Bügels AE3 verbunden ist. Der Ring A4 wird durch den Schlitz F4 von der nächsten Ringgruppe getrennt.

The slots F1-F4 leave the rings A1-A4 connected as follows:

• - The ring A1 remains through its connecting bracket AL1 with the tube of the electrode 5 connected; its elastic bracket AE1 is through the slot F1 from the pipe 5 separated;
• - The ring A2 remains connected by its connecting bracket AL2 with the back of the ring A1 in the illustrated angular position; the connecting bracket AL2 is thus connected to the back of the elastic strap AE1;
• - The ring A3 is connected by its connecting bracket AL3 with the back of the ring A2 in the illustrated angular position, so that the connecting bracket AL3 is connected to the back of the elastic strap AE2,
• - The ring A4 is connected by its connecting bracket AL3 with the back of the ring A3 in the illustrated angular position, so that the connecting bracket AL4 is connected to the back of the elastic bracket AE3. The ring A4 is separated by the slot F4 from the next ring group.

• – die beiden Ringe A_n-1, A_n eines jeden Paares sind durch einen Verbindungsbügel verbunden, der ein gemeinsamer Bügel für beide Ringe ist und der eine Art im Werkstoff eingearbeitetes Scharnier darstellt, wenn man davon ausgeht, dass der verbleibende Teil jedes der beiden Ringe starr ist,
• – der zweite Ring A_n eines Paares ist der erste Ring A_n+1 des folgenden Paares,
• – das folgende Paar hat einen Verbindungsbügel, der lageversetzt zum Verbindungsbügel des vorhergehenden Paares angeordnet ist,
• – die Lageversetzung entspricht beispielsweise einer Winkeldrehung von 45° oder von 90° der Verbindungsbügel um die xx-Achse des extensiblen Segments 52.

Another type of description of the elastically extensible segment 52 whose representation through a three-dimensional drawing is difficult to accomplish is to equate this to a sequence of ring pairs by assigning the index n (n = -1, 1, 2, etc.) to the rings:

• - The two rings A _n-1 , A _n of each pair are connected by a connecting bracket, which is a common bracket for both rings and which represents a kind incorporated in the hinge material, assuming that the remaining part of each of the two Rings is rigid,
• The second ring A _{n of} a pair is the first ring A _{n + 1 of} the following pair,
• The following pair has a connection bracket which is arranged offset in position from the connection bracket of the preceding pair,
• - The positional displacement corresponds for example to an angular rotation of 45 ° or 90 ° of the connecting bracket about the xx-axis of the extensive segment 52 ,

• – bilden die Ringe A1, A2 einen Flächenwinkel, dessen Kante der Bügel AL12 ist,
• – bilden die Ringe A3, A4 einen weiteren Flächenwinkel, dessen Kante der Bügel AL4 ist,
• – werden die beiden Flächenwinkel durch den Bügel AL3 um 90° versetzt zusammengefügt,

wenn die Ringe A1–A4 starr wären und wenn man den Verbindungsbügel AL1–AL4 als Scharnier betrachten würde.In other words and considered very schematically

• The rings A1, A2 form an area angle whose edge is the bar AL12,
• The rings A3, A4 form another surface angle whose edge is the bar AL4,
• - The two surface angles are offset by the bracket AL3 offset by 90 °,

if the rings A1-A4 were rigid and if you would consider the connecting bracket AL1-AL4 as a hinge.

In practice, the rings A1-A4 are elastically deformable, and the 90 ° offset causes the back of the ring A4 to be in a diameter plane through its connecting bracket (on the back), as well as for the connecting bracket AL1 of the ring A1 by simply pointing it perpendicular to it.

According to the in 4 The example shown becomes the elastically extensible segment 52 formed by a series of four ring groups (A1-A4) assembled as described above.

The 6 shows a further embodiment of the extensive segment, which is formed of elastically deformable rings A'1-A'8, the connecting bracket AL'1-AL'8 but offset in an angular step of 45 °. The elastic straps are called AE'1-AE'8. To simplify the illustration, the rings A'1-A'8 are in even ring groups A'2, A'4, A'6, A'8 or in odd ring groups A'1, A'3, A'5, A'7 shown, but these rings are arranged in the extensible segment in ascending numerical order.

• – Die Elektrode (5) wird mit einem extensiblen rohrförmigen Segment (52) versehen, indem eine Folge von Ringen (A1–A4, A'1–A'8) ausgeschnitten wird, indem in unterschiedlichen Ausrichtungen um die Achse (xx) der Elektrode herum Schlitze (F1–F4) ausgeführt werden, so dass Verbindungsbügel (AL1–AL4, AL'1–AL'8) entstehen, die in Umfangsrichtung von einem Ring zum folgenden versetzt angeordnet sind.
• – Nach dem extensiblen Segment 52 wird in Richtung des hinteren Endes 54 der Elektrode die Blockierungsfläche 53 ausgeführt.
• – Der Glüheinsatz 22 wird mit der Elektrode 5 verbunden. Vor der Montage des rohrförmigen Körpers 1 wird die Hülse 7 vorzugsweise auf die Rändelung 53 aufgepresst, damit sie ihre Lage auf der Elektrode 5 behält.
• – Die nächste Etappe besteht in der Positionierung des rohrförmigen Körpers 1 zum breiten Bund 24 des Glüheinsatzes 2, um die endgültige Montage durch die Schweißverbindung 16 auszuführen.
• – Anschließend wird die Elektrode 5 durch die Einschnürung 14 blockiert.
• – Die vorletzte Etappe besteht darin, die Isolationshülse 8 zu montieren, indem die Außenfläche 81 mit dem Durchmesser der Senkung 17 des Bereichs 12 des rohrförmigen Körpers 1 in Anschlag gebracht wird.
• – Die letzte Etappe besteht darin, dass die Hülse 31 des Anschlussbolzens 3 in das hintere Ende 12 des rohrförmigen Körpers 1 eingepresst wird, wobei die Isolationshülse 8 und der Stift 34 des Anschlussbolzens 3 in die Elektrode 5 eingefügt und anschließend die Einheit aus Anschlussbolzen und Elektrode durch die Einschnürung formschlüssig miteinander verbunden wird.

The assembly of the glow plug according to the invention is carried out in a simple manner after execution of the different components:

• - the electrode ( 5 ) is fitted with an extensible tubular segment ( 52 ) by cutting out a series of rings (A1-A4, A'1-A'8) by making slots (F1-F4) in different orientations about the axis (xx) of the electrode, so that connecting straps ( AL1-AL4, AL'1-AL'8) which are circumferentially offset from one ring to the next.
• - After the extensible segment 52 goes towards the back end 54 the electrode the blocking surface 53 executed.
• - The glowing insert 22 is with the electrode 5 connected. Before mounting the tubular body 1 becomes the sleeve 7 preferably on the knurling 53 pressed on, so that their position on the electrode 5 reserves.
• - The next stage is the positioning of the tubular body 1 to the broad covenant 24 of the glowing insert 2 to the final assembly through the welded joint 16 perform.
• - Subsequently, the electrode 5 through the constriction 14 blocked.
• - The penultimate stage is the insulation sleeve 8th to assemble by the outer surface 81 with the diameter of the countersink 17 of the area 12 of the tubular body 1 is brought into attack.
• - The last stage is that the sleeve 31 of the connecting bolt 3 in the back end 12 of the tubular body 1 is pressed, wherein the insulating sleeve 8th and the pen 34 of the connecting bolt 3 into the electrode 5 inserted and then the unit of connecting bolt and electrode is positively connected by the constriction.

These different manufacturing and assembly work is very easy and quick to accomplish and lead to an economical glow plug.

LIST OF REFERENCE NUMBERS

1

Tubular body

11

front end

12

rear end

13

external thread

14

Area with necking / constriction

15

tool application

16

Welded connection between the wide collar and the tubular body

17

reduction

18

beaded

2

Glow plug

21

metal sheath

22

glow insert

24

wide waistband

26

sealing cone

3

connecting bolt

31

shell

32

Federation

33

terminal base

34

pen

4

front connection

5

tubular electrode / tube

51

front end

52

Extensible segment

53

Knurled / latching surface

54

rear end

6

rear connection

7

insulation sleeve

8th

insulation sleeve

81

outer surface

82

palm

A1-A4

rings

AL1-AL4

hanger

AE1 AE4

elastic straps

xx

Axis of the candle

A'1-A'8

rings

AL'1-AL'8

connecting brackets

AE'1-AE'8

elastic straps

Claims (9)

A glow plug for diesel engines, comprising - a tubular metallic body ( 1 ), which at one end ( 11 ) with a ceramic glow plug ( 2 ) and at the other end ( 12 ) with a connecting bolt ( 3 ), wherein the glow plug ( 2 ) in the ceramics of the glowing insert ( 22 ) accommodates an integrated heating conductor, - an electrode ( 5 ), which the tubular body ( 1 ) passes through in isolation and the heating conductor of the glow insert ( 22 ) and the connecting bolt ( 3 ), which in turn in the end of the tubular body ( 1 ) is electrically isolated, wherein the candle is characterized in that the conductor path for the power supply of the glow insert ( 22 ) Comprises: an electrode ( 5 ) with at least one extensible tubular segment ( 52 ) formed by a series of elastically deformable rings (A1-A4) (A'1-A'8) formed by slots (F1-F4) in the tubular segment, the rings (A1-A4 ) (A'1-A'8) are connected to each other by a connecting bracket (AL1-AL4) connecting the front of a ring (A _n ) to the back of the preceding ring (A _n-1 ), the remainder of Ring (A _n ) forms an elastically deformable bracket (AE1-AE4), - wherein the connecting bracket (AL1-AL4) in the circumference of a ring (A _n ) to the following ring (A _{n + 1} ) are offset. Glow plug according to Claim 1, characterized by a means for blocking the electrode ( 5 ), with which a portion of the electrode ( 5 ) to the tubular body ( 1 ), whereby the extensible segment ( 52 ) between the connection (4) of the electrode ( 5 ) with the glow insert ( 22 ) and the means for blocking the electrode ( 5 ) is located. Glow plug according to claim 2, characterized in that the means for blocking the electrode ( 5 ) Comprises: - a detent surface ( 53 ) caused by a local deformation of the surface of the electrode ( 5 ), - an insulating sleeve ( 7 ), which with the catch surface ( 53 ) is engaged, - a constriction ( 14 ) of the tubular body ( 1 ), with which the sleeve ( 7 ) in the local deformation of the locking surface ( 53 ) of the electrode ( 5 ) is pressed to the necking ( 14 ) of the tubular body ( 1 ) positively with the locking surface ( 53 ) of the electrode ( 5 ) connect to. A glow plug according to claim 1, characterized in that the extensible segment ( 52 ) of the electrode ( 5 ) is formed by a series of identical ring groups (A1-A4) (A'1-A'8). Glow plug according to claim 1, characterized in that the rear end ( 15 ) of the tubular metallic body ( 1 ) a reduction ( 17 ) for receiving the outer surface ( 81 ) of an insulation sleeve ( 8th ) whose inner surface ( 82 ) the sleeve ( 31 ) of the connecting bolt ( 3 ). Glow plug according to claim 1, characterized in that the connecting straps (AL1-AL4) (AL'1-AL'8) in the circumference at an angle of 45 ° or 90 ° from one ring (A _n ) to the following ring (A _{n + 1} ) are offset at an angle to each other. A glow plug according to claim 1, characterized in that the connecting straps (AL1-AL4) (AL'1-AL'8) have a shorter length than the non-deformable elastic strap (AE1-AE4) (AE'1-AE'8). A glow plug according to claim 1, characterized in that the connection bars (AL1-AL4) (AL'1-AL'8) are identical from one ring to another. Method for producing a glow plug according to one of Claims 1 to 8, characterized in that - the electrode ( 5 ) with an extensible tubular segment ( 52 ) by cutting a series of rings (A1-A4, A'1-A'8) resulting from the execution of slots (F1-F4) in different directions about the axis (xx) of the electrode are arranged around, thereby forming connection bars (AL1-AL4, AL'1-AL'8) circumferentially offset from one ring to the next; - the catch surface after the extensible segment ( 52 ) towards the rear end ( 54 ) of the electrode is carried out, - the glow insert ( 22 ) in the coat ( 21 ) is fixed by being fixed by a solder joint, which further the electrical contact between the heating conductor and the jacket ( 21 ), - the glowing insert ( 22 ) through a connection ( 4 ) with the front end ( 51 ) of the electrode ( 5 ) and the mission ( 22 ) in the coat ( 21 ) is fixed by being fixed by a solder joint, which further the electrical contact between the heating conductor and the jacket ( 21 ), - the sleeve ( 7 ) on the knurling ( 53 ) of the electrode ( 5 ) is applied, - the tubular body ( 1 ) by passing it through a welded joint ( 16 ) on the broad band ( 24 ), and then the electrode ( 5 ) through the constriction ( 14 ) of the tubular body with insertion of the insulating sleeve ( 7 ) on the knurling ( 53 ) of the electrode ( 5 ), - the insulating sleeve ( 8th ) in the lowering ( 17 ) of the rear area ( 12 ) of the tubular body ( 1 ), and - the sleeve ( 31 ) of the connecting bolt ( 3 ) with insertion of the insulating sleeve ( 8th ) and the pen ( 34 ) of the connecting bolt ( 3 ) are pressed in at the same time and then the edge ( 18 ) at the end ( 15 ) of the body ( 1 ) at the rear end of the insulation sleeve ( 8th ) is crimped.

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