Exhaust gas cleaning device for diesel engine

An exhaust gs cleaning device including a casing having an inlet and outlet for collecting carbon particulates in exhaust gases emitted from a diesel engine and for heating and burning the collected carbon particulates, comprising:

• a filter member positioned in said casing and which collects carbon particulates in exhaust gases flowing therethrough;
• said filter member being formed of heat resistant porous material having interconnected fine pores;
• said filter member being composed of two filter elements having different cell densities and which closely contact with each other;
• one of said two filter elements having a higher cell density being arranged on the upstream side of the other filter element on the inlet side of said casing;
• an electrical heating means which heats and burns the collected carbon particulates;
• said heating means being provided with at least one heater wire which is buried within said filter element having a higher cell density;
• and
• a heating means operating means which supplies an electric current to said electrical heating means when the amount of carbon particulates collected by said filter member reaches a predetermind amount.