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 invention relates to a glow plug
• Combustion chamber facing cylindrical bore realized in the candle housing. This bore is characterized by a diameter that is larger than the interference fit diameter of the glow plug.
• the glow plug according to the invention with the characterizing features of the main claim has the task of largely thermally decoupling the glow plug at the corresponding annular gap depth and thus ensuring the desired heating characteristic.
• the depth of the annular gap must be adapted to the projection dimension for a standard pencil with the same geometry and heating characteristics. This results in a large variety of parts of the candle housing, which only vary due to the depth of the annular gap.
• the main advantage is that, in contrast to the prior art, the annular gap is realized by a glow plug, correspondingly offset in the area of the press fit, with a widened diameter and a candle housing without a graduated diameter. This allows the
• Number of candle housings which vary in their geometry only by the depth of the annular gap, can be reduced to a housing that can be used universally for this feature.
• a standard pin of constant geometry can still be used
• FIGS. 2 and 3 show a glow plug, partly in longitudinal section, in FIGS. 2 and 3 on an enlarged scale the annular gap zone designated by X.
• the glow plug 10 consists of an elongated, cylindrical housing 11 with a central bore 12, which has a conical extension 13 towards the upper end. Somewhat below this extension, an annular shoulder 15 is formed on the bore 12, namely in that the diameter of the bore 12 above this paragraph 15 is slightly smaller than the diameter in the subsequent region 12 A of the bore 12.
• the Glow plug 16 which dips with its tip 17 into the combustion chamber of the engine.
• the joint between glow plug and candle housing has so far been designed as a press fit 12 A with a constant bore diameter on the combustion chamber side.
• the projection dimension V of the glow plug 16 of the glow plug candle is defined as the distance between the radiator tip and the test diameter on the sealing cone of the candle housing.
• the construction of the glow plug has not been discussed further, since it is not essential to the invention. It can expediently be pressed into the bore 12.
• Glow tube of the glow plug arranged filament is also not shown.
• the connecting bolt 18 protruding from the candle housing 11 serves to supply current to the current coil.
• the connecting pin 18 is fixed by means of a radially pressed seal 20 in the upper, tubular region of the glow plug 16, which is not further shown.
• the seal 20 seals the glow plug 16 between the glow tube and the connecting pin 18 from the environment.
• the annular shoulder 15 on the housing 11 has the purpose that the glow plug 16 together with the connecting pin 18 at too high pressure in
• FIGS. 2 and 3 show the area of the annular gap 21 or the annular gap zone between the candle housing and glow plug which is relevant to the invention. This zone is realized between the constant interference fit diameter of the candle housing on the combustion chamber side and a glow plug which is offset in the outer diameter within the candle housing.
• the area of the glow plug on the combustion chamber side below a shoulder 16 B has a smaller diameter 16 C than that of the press fit area 12 A.
• Figure 2 shows the arrangement of the glow plug according to the invention in the candle housing to produce an annular gap depth R1.
• FIG. 3 shows the arrangement of the glow plug according to the invention in the candle housing to produce an annular gap depth R2.
• the glow plugs according to Figures 2 and 3 can have the same geometry and heating characteristics, i.e.
• a standard glow plug can be used to implement different annular gap depths (here: Rl> R2) and thus different projection dimensions (here: VI ⁇ V2).
• the varying annular gap depths and projection dimensions can be realized in that the standard glow plug is pressed correspondingly deep into the press fit of the housing 11.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Resistance Heating (AREA)
• Spark Plugs (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7850183

Family Applications (1)

Country Status (5)

Families Citing this family (1)

Citations (2)

• 1997
  • 1997-11-28 DE DE19752920A patent/DE19752920A1/de not_active Withdrawn
• 1998
  • 1998-11-30 DE DE59803784T patent/DE59803784D1/de not_active Expired - Lifetime
  • 1998-11-30 JP JP2000523502A patent/JP4188559B2/ja not_active Expired - Fee Related
  • 1998-11-30 EP EP98962285A patent/EP1034399B1/de not_active Expired - Lifetime
  • 1998-11-30 ES ES98962285T patent/ES2175833T3/es not_active Expired - Lifetime
  • 1998-11-30 WO PCT/DE1998/003503 patent/WO1999028679A1/de active IP Right Grant

Patent Citations (2)

Non-Patent Citations (1)

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