Exhaust manifold

Abstract

An exhaust manifold for an internal combustion engine with an exhaust gas conducting inner tube and an outer jacket which is insulated particularly effectively and inexpensively is described. To this end, it is suggested to embody the insulation as an insulating molded part pressed into shape and to arrange it between the jacket and the interior, the insulating molded part containing an insulating fibrous tissue and a binder.

1 . Exhaust manifold ( 1 ) for an internal combustion engine, having an exhaust gas conducting inner tube ( 2 ), an outer jacket ( 3 ), and an insulation ( 4 ), characterized in that the insulation is embodied as an insulating molded part ( 4 ) pressed into shape and arranged between the jacket ( 3 ) and the inner tube, and that it contains an insulating fibrous tissue and a binder. 
     
     
         2 . Exhaust manifold according to  claim 1 , wherein:
 the insulating fibrous tissue contains a fiber mat of mineral fibers, such as a woven glass and/or silicate and/or ceramic fiber mat.   
     
     
         3 . Exhaust manifold according to  claim 1 , wherein:
 the binder is alumina, in particular bentonite.   
     
     
         4 . Exhaust manifold according to  claim 1 , wherein:
 the insulating molded part ( 4 ) is separated from the inner tube ( 2 ) by an air gap ( 5 ).   
     
     
         5 . Exhaust manifold according to  claim 4 , wherein:
 the insulating fibrous tissue of the insulating molded part ( 4 ) is arranged adjacent to the air gap ( 5 ).   
     
     
         6 . Exhaust manifold according to  claim 1 , wherein:
 the insulating molded part ( 4 ) contains heat absorbing and/or heat reflecting pigments.   
     
     
         7 . An exhaust manifold for an internal combustion engine comprising:
 an exhaust gas conducting inner tube;   a jacket spaced a distance from said exhaust gas conducting inner tube; and   an insulating molded part pressed into a shape and placed between said exhaust gas conducting inner tube and said jacket, said insulating molded part comprising an insulating fibrous tissue and a binder,   whereby a mechanical cohesion is obtained and fibers are prevented from being blown out.   
     
     
         8 . An exhaust manifold for an internal combustion engine as in  claim 7  wherein:
 said insulating molded part is placed adjacent said jacket so that an air gap is formed between said insulating molded part and said exhaust gas conducting inner tube. 
 
     
     
         9 . An exhaust manifold for an internal combustion engine as in  claim 7  wherein:
 the insulating fibrous tissue comprises a woven cloth of insulating fibers.