Exhaust muffler of enamelled steel sheet metal and method of producing it

Abstract

The invention relates to an exhaust muffler made of enamelled sheet steel, which is composed of a plurality of structural parts in which the structural parts of the muffler are coated with enamel slick, are then put together and heated to enamelling temperature, with the contacting surfaces of the structural parts thus fusing and in that way being securely connected together. Such structural parts include two head pieces provided with connection pipes which are positioned on the exhaust muffler sheath, as well as sound absorbing elements disposed inside the muffler. The head pieces and the sound absorbing elements arranged on the inside of the sheath, are connected with the sheath by means of connection surfaces located on the peripheral edges of the head pieces and the sound absorbing elements which are bent over parallel to the wall of the sheath. Between these various surfaces enamel slick is applied, whereby these members are connected together upon firing. The enamel slick in the connection region of the structural parts is partially reacted in a pre-firing step, with a complete fusing together of the structural parts being achieved in an after-firing. A third enamelling imparts additional properties.

Dependencies are inferred from the claim text.