| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the temperature rise characteristics of a glow plug which includes a heating element formed mainly of tungsten (W) or molybdenum (Mo).SOLUTION: The glow plug includes a cylindrical body formed cylindrical with its front end closed, a first heating element joined to the front end inside the cylindrical body, and adapted to be energized to generate heat, and a second heating element connected in series to the first heating element inside the cylindrical body, and adapted to be energized to generate heat. An electric resistance of a wire rod constituting the first heating element per unit length at 20°C is higher than an electric resistance of a wire rod constituting the second heating element per unit length at 20°C. The second heating element is formed mainly of tungsten (W) or molybdenum (Mo).</p> |
