ELECTRICALLY-HEATED CATALYST

摘要

The electricity is suppressed from flowing through a case (5) of an electric heating catalyst (1). The electric heating catalyst (1) comprises a heat generating element (3) which generates heat by applying electricity; a case (5) which accommodates the heat generating element (3); a mat (6) which is provided between the heat generating element (3) and the case (5) and which insulates the electricity; and an inner tube (4) which is provided on an inner side as compared with the case (5) and on an outer side as compared with the heat generating element (3) and which is supported by the mat (6) while dividing the mat (6) into a part disposed on a case (5) side and a part disposed on a heat generating element (3) side; wherein distances between the inner tube (4) and the case (5) are provided such that the distance is required to support the inner tube (4) at a portion at which the mat (6) exists, and the distance is required to avoid occurrence of any electric discharge between the inner tube (4) and the case (5) at a portion at which the inner tube (4) protrudes from the mat (6).