Acoustics – Sound-modifying means – Combined
Patent
1997-01-13
1998-12-01
Dang, Khanh
Acoustics
Sound-modifying means
Combined
180 892, F01N 700, B60K 1304
Patent
active
058441778
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention concerns a heat shield for heat exhaust sources, such as exhaust systems, and more particularly provides a retaining hanger mounted to the heat source which places the heat shield only a small distance from the heat source.
2. Description of the Related Art
Heat shields of the type in question are used for shielding the body of motor vehicles, where the heat emitting parts may include an exhaust pipe, a muffler, a catalytic converter or other parts of the exhaust system or the engine. The invention is thus based on a heat shield of the type defined initially that is to shield a part that emits heat to protect neighboring parts from the radiant heat.
It is known that such heat shields are made of a multilayer aluminum material, which has the advantage that this aluminum material can be shaped very easily and has a high reflectivity, so a highly effective heat shield can be created with relatively little material. In the past, however, it was known only that such a heat shield could be mounted on parts of the automobile body itself, although that greatly restricted the use range.
There are several drawbacks to this known type of mounting of a heat shield on the automobile body or parts directly connected thereto, among them being;
1. The heat shield must be relatively large because it is relatively far away from the heat emitting part, and therefore the entire body surface must be shielded with respect to the heat emitting part, which thus leads to the necessity of using a heat shield with a relatively large area. Therefore, the heat shield must also be mounted a relatively great distance away from the heat-emitting exhaust because the latter is subject to certain vibrations, and the vibrating exhaust must not come in contact with the heat shield opposite it at the maximum amplitude of its vibration. For this reason, it is necessary to shield relatively large areas of the automotive body or even the tank surfaces of the gasoline tank.
2. Another disadvantage of mounting the heat shield on automotive body parts or on parts that are directly mounted on the body is that additional mounting parts on the body are needed, but such are not always available. For example, if the radiant heat from an exhaust pipe passing directly by the gasoline tank is to be shielded, it is practically impossible to mount the heat shield on the gasoline tank itself because the heat shield is heated to temperatures of 200.degree. C. or 250.degree. C. and the mounting parts on the gasoline tank, or the tank itself which may be made of plastic, can withstand temperatures only up to 80.degree. C. Consequently, it has been impossible in the past to directly mount heat shields made of aluminum directly on exhaust parts or other parts that emit a great deal of heat, because the melting point of aluminum is in the range of about 600.degree. C. and is thus higher than the melting point of the plastic parts. With direct mounting, too much heat can also be transferred and thus the temperature inside the vehicle may rise too high, so parts of the interior, such as the carpet or other objects, can be damaged.
SUMMARY OF THE INVENTION
A major purpose of this invention is therefore to improve on a heat shield and a mounting of the heat shield of the type mentioned initially such that they can be mounted directly on heat emitting parts.
It is an important feature of this invention that the heat shield is mounted a relatively short distance from the heat emitting part, such as the exhaust pipe, the muffler, the exhaust manifold or similar parts, and a retaining hanger is mounted behind the heat shield as seen from the heat emitting part, and this retaining hanger is directly connected to the heat emitting part by way of a connecting element.
Another embodiment provides for the retaining hanger to secure and mount the heat shield at a point on the heat shield where the temperature of the heat shield, and/or the U-shaped retaining hanger, has already dropped relatively greatly.
In
REFERENCES:
patent: 3237716 (1966-03-01), Parsons
patent: 4085816 (1978-04-01), Amagai et al.
patent: 4609067 (1986-09-01), Gonwa
patent: 4612767 (1986-09-01), Engquist et al.
patent: 5211013 (1993-05-01), Bonde et al.
patent: 5603297 (1997-02-01), Wolf et al.
patent: 5680757 (1997-10-01), Pirchl
Dang Khanh
Hecralmat
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