Patent ID: 6433311
Filing Date: 2002-08-13
Classification: F23Q

Abstract:
A glow plug comprising:an outer shell; an inner pole disposed partly in the outer shell and fixed thereto at a plurality of pole fixed portions, the inner pole having first and second ends, the pole fixed portions including first and second pole fixed portions located nearest to the first and second ends of the inner pole, respectively, each of the first and second pole fixed portions having first and second ends located nearer to the first and second ends of the inner pole, respectively; a ceramic heating rod disposed partly in the outer shell in line with the inner pole, the ceramic heating rod having first and second ends, the second end of the ceramic heating rod being located adjacent to the first end of the inner pole; and an electric conductor electrically connecting the inner pole with the ceramic heating rod, wherein a ratio of L2/L1 is larger than 2, where L1 is a distance from the first end of the inner pole to first end of the first pole fixed portion and L2 is a distance from the first end of the inner pole to the first end of the second pole fixed portion.