Pipe joints or couplings – With casing – lining or protector – Insulated
Patent
1994-05-27
1995-08-01
Arola, Dave W.
Pipe joints or couplings
With casing, lining or protector
Insulated
285 50, 285226, 285286, 285300, F16L 1112
Patent
active
054374790
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
a) Field of the Invention
The invention is directed to a flexible connection arrangement for two pipe portions, particularly in motor vehicle exhaust systems, with a metallic bellows which is connected axially on either side in a gastight manner with connection pieces in the form of substantially cylindrical sleeves or sockets, the sides of the connection pieces facing the bellows having radially widened end portions with substantially cylindrical end regions, the connection arrangement further comprising a damping insert, which extends coaxially to the bellows along its length and is in a working connection therewith, and heat protection means for the bellows acting in the radially inward direction.
b) Description of the Relevant Art
Such flexible connection arrangements are used in exhaust systems, particularly in motor vehicles, in the form of intermediate pieces serving to connect the pipe portions attached thereto in a resilient, articulated and damped manner and to eliminate vibrational interaction between these parts, i.e. to uncouple relative movements, oscillations and vibrations from the adjacent structural component parts. In other respects, the exhaust lines are constructed as rigid systems so that the matter of resilient uncoupling is of considerable importance.
With regard to connection arrangements of this type, increasing attention has lately been centered on questions relating to good sound-proofing, effective heat insulation and, in particular, efficient sealing against undesirable emission of exhaust gases from the exhaust line, particularly if the connection arrangements in question are installed upstream of the catalytic converter as viewed in the direction of flow of the exhaust gases.
A great many flexible connection arrangements of this type for pipe portions are known, including those in which sealing against unwanted emission of exhaust gases is effected by means of a metallic bellows whose two ends are tightly connected, respectively, with the two pipe portions.
A flexible connection arrangement which makes use of a flexible bellows directly surrounded by a braided tube of metal wire is known from EP-A-0 432 436. The bellows and braided tube are arranged inside a cylindrical support ring and pressed together with one another and with the latter at the ends, the parts being interconnected by provisional stitches. In addition, at least one flexible damping member which proceeds from one end of the connection arrangement and is movable relative to the braided tube is provided for effectively absorbing the oscillations and vibrations occurring during operation. The damping member produces the desired damping action by frictional contact with the braided tube surrounding the bellows. For example, this flexible damping member may be constructed as a spring (e.g., a coil spring or helical spring) which has frictional contact with and is displaceable on the braided tube, one end of the spring being fastened to an end of the connection arrangement, while its other end is arranged on the braided tube so as to be freely displaceable. This known connection arrangement has a somewhat complicated design, since both axial ends of the braided tube must be tightly and securely pressed together with the respective ends of the bellows and supporting ting. Moreover, the braided tube must completely absorb all axial forces, which can result in a tear in its connection points at the ends or even in the braided tube itself. In addition, such metallic braided tubes have only a very limited ability to rotate and become frayed easily. It is also difficult to assemble known connection arrangements of this type, particularly as concerns the frictional contact of the damping spring at the braided tube.
A flexible connection arrangement of the type mentioned in the introduction is described in EP 0 282 689 A2. In this known flexible connection element, the bellows and damping insert are arranged coaxially relative to one another, the radially inwardly directed end regions of the f
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patent: 5145215 (1992-09-01), Udell
Deinhard Hans
Hartling Peter
Arola Dave W.
Feodor Burgmann Dichtungswerke GmbH & Co.
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