| 主权项 |
1. An insulator having an inner surface for covering an exhaust system of an internal-combustion engine, comprising:
a cover member having a surface; a joint member formed on the surface of the cover member; and a mat member made of material including at least one of ceramic fibers and glass fibers, the mat member being attached to the cover member through binding of the fibers to the joint member, and the mat member being exposed to form the inner surface, wherein the joint member includes one or more projections sticking out from the surface of the cover member, each of the projections having a hook part mounted thereto, wherein the mat member has needle traces where fibers of the needle traces are entangled with each other, wherein the one or more projections and the hook part are entangled with the needle traces so as to securely fix the mat member to the cover member, and wherein the hook part is any one of triangular plate, a quadrangular plate, and a trapezoidal plate, and is fixed to the projection by welding. |
