| 摘要 |
<p>PURPOSE:To equalize the electricity consumption of each heater wire by a method wherein a heater arranged in a trap case is composed of plural meandering- shaped heater wires divided in angular direction, the inner end of each heater wire is connected to a common terminal, while its outer end is connected to a power source terminal. CONSTITUTION:A heater 22 at the front surface of a trap member is arranged in a trap case to be intersected at the right angle for the exhaust gas flow direction. The heater 22 is composed of, for instance, parts divided into six in angular direction, six heater wires 24-1-24-6 which are arranged in a fan-shaped area. Those heater wires 24-1-24-6 are detachably attached on a heater base plate 26 with insulators 38 via insulating bodies 34. The heater base plate 26 is composed of a circumference periphery part 261, six heater supporting parts 262 which are extended from the circumference periphery part 261 in radial direction, and a central part 263 to which the supporting parts 262 are centered. The inner end of each heater wire 24-1-24-6 is connected to an earth electrode 42 at the central part, while the outer end of each wire is connected to each power source terminal 56-1-56-6 via each conductive belt plate 70-2-70-5.</p> |
