Pressure measuring glow plug
AssigneeBorgWarner Ludwigsburg GmbH
InventorMichael Haussner
Life of this patent
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Abstract
Described is a pressure measuring glow plug with a housing, a glow pin, which projects out of the housing and can be displaced in its longitudinal direction relative to the housing against a restoring force. A sensor acquires the position of the glow pin or a pressure acting on the glow pin, and a center pole is arranged in the housing and electrically connected to the glow pin via a contact spring. This disclosure provides that the contact spring is a U-shaped, bent metal strip, which in a middle section has a reduced width, and broadens from the middle section toward its two ends.
Claims11
A pressure measuring glow plug, comprising:
- a housing;
- a glow pin projecting from the housing and displaceable in a longitudinal direction relative to the housing;
- a sensor for measuring the position of the glow pin relative to the housing or for measuring pressure acting on the glow pin;
- and
- a center pole arranged in the housing and electrically connected to the glow pin via a contact spring;
- wherein the contact spring is a U-shaped, bent metal strip, the bent metal strip defining a length, a width and a thickness, the length of the bent metal strip extending between two ends with a middle section between the two ends, the width extending perpendicular to the length, and the thickness extending perpendicular to both the length and the width with the thickness being smaller than the width, and wherein the middle section of the bent metal strip has a reduced width, and the width of the bent metal strip broadens from the middle section toward its two ends.
Dependencies are inferred from the claim text.