Glow plug
OwnerAndreas Ruthmann, Ulf Wyrwich +2inventors
InventorsAndreas Ruthmann, Ulf Wyrwich, Dirk von Hacht, Volker Brichzin
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Abstract
This disclosure relates to a glow plug comprising a housing and a glow pencil protruding from the housing. The glow pencil has a metal sleeve in which a heating coil and a control coil are arranged. The metal sleeve has a first portion surrounding at least part of the heating coil and a second portion surrounding at least part of the control coil. The first portion has a smaller wall thickness than the second portion. Also disclosed is an inventive method for producing a glow pencil for a glow plug.
Claims14
A glow plug, comprising:
- a housing;
- and
- a glow pencil protruding from the housing and having a metal sleeve in which a heating coil and a control coil are arranged, the metal sleeve having a first portion surrounding at least part of the heating coil and a second portion surrounding at least part of the control coil, the first portion having a smaller wall thickness than the second portion.
A method for producing a glow pencil for a glow plug, comprising:
- arranging a heating coil and a control coil in a metal sleeve;
- welding the heating coil to a base of the metal sleeve;
- filling the metal sleeve with electrically insulating ceramic powder and removing material from a portion of the metal sleeve which surrounds at least part of the heating coil material, which thereby reduces the wall thickness of the metal sleeve;
- and
- then plastically deforming the metal sleeve to thereby reduce the diameter of the metal sleeve and increase the length of the metal sleeve.
Dependencies are inferred from the claim text.