A heat shield structure of an exhaust manifold and a catalyst has a flange which is provided in a connecting portion connecting the exhaust manifold and catalyst and forms an open channel, an exhaust manifold heat shield member which covers an upper surface of the exhaust manifold, and a catalyst heat shield member which covers an upper surface of the catalyst. In the heat shield structure, an open side of the channel faces to the catalyst's side, a rear end of the exhaust manifold heat shield member is arranged on a vehicle body upper side of an end portion of the flange, and a front end of the catalyst heat shield member is arranged on a vehicle body floor side of the end portion of the flange. By this structure, heat from the exhaust manifold and catalyst can be efficiently released.

A housing for a turbocharger forms a housing jacket (6, 7) which surrounds a rotor space (15) for receiving a turbine rotor (18). The housing jacket consists of sheet metal at least in part. A connection pipe (4') provides for communication with an exhaust gas manifold (3, 4) of a combustion motor (20). To reduce heat losses, it is not only the housing jacket (6, 7, 22) which surrounds the rotor space (15) and consists of sheet metal, but at least the connection pipe (4') for communication with the exhaust gas manifold (3, 4) is shaped of sheet metal and is in heat conductive connection with the sheet metal of the housing jacket (6, 7, 22).

The invention relates to a soundproof thermal shield (3), particularly for motor vehicles, comprising an aluminum support (4), a noise-absorbing layer (6) and an aluminum thermal covering (7). In order to make the inventive soundproof thermal shield easy to recycle while obtaining a great thermal shielding effect and noise-absorbing power, a permeable mat made of knitted aluminum is used as a noise-absorbing layer (6), said knitted aluminum being superimposed in several layers and pressed so as to form the permeable mat. The inventive thermal shield is thus made of a single material. Preferably, the support (4) is made of a microperforated aluminum sheet while the thermal covering (7) is preferably made from an aluminum film.

An exhaust device includes an exhaust pipe connected at its upstream end to a cylinder head of the engine and an exhaust muffler connected to the downstream end of the exhaust pipe for suppressing the generation of noise from a heat insulating cover that covers a part of the exhaust pipe. A heat insulating cover covers a portion of the exhaust pipe near the engine and a stay is fixed to the heat insulating cover. The stay includes a supporting plate portion curved so as to partially surround the outer circumference of the exhaust pipe. A first vibration isolating member is provided that is sandwiched between the outer circumference of the exhaust pipe and the supporting plate portion, a band member is tightened to mount the supporting plate portion to the exhaust pipe, and a second vibration isolating member is sandwiched between the supporting plate portion and the band member.