DE7638583U1 - BG GAS PIPE FOR VEHICLES - Google Patents

Description

The control relates to an exhaust pipe for motor vehicles.

Usually exhaust pipes for motor vehicles are formed by rigid or semi-rigid pipes, woj with movements and vibrations caused by the elastic mounting of the engine, by thermal expansion or by ^: chassis vibrations as well as impulses from the flowing down! gases are generated and transferred to neighboring construction parts. This creates undesirable oscillations of different frequencies, e.g. noises or vibrations from

Parts that lead to nuisance, damage to health and material; lead to fatigue,

Have so far been resilient intermediate pieces to avoid these movements and vibrations, for _o B "metal Wellkompen-t · capacitors, integrated into the exhaust pipe, but this can not ■ entirely satisfactory, since thin-walled compensation pieces with good damping · igseigenschaften against external damage and against .Corrosion from the outside, z _o B _o through road salt, and from the inside through condensate özr exhaust gases "at standstill and cold start sens-

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7638583 08.08.77

Lich are, In addition, additional vibrations can be fanned at higher flow velocities. However, thick-walled semi-rigid compensation pieces have insufficient dampening .: fungseigensohaften and are also susceptible to corrosion in both cases arise in every movement design-related internal stresses, fatigue, in particular at the present operating temperatures from 450 to 800 ⁰ C to material and thus to an early failure of these elements leads. ^;

The innovation is an object to eliminate the drawbacks mentioned and a reliable ABGA _s - j to create line better operating characteristics and long service life with economic -production "

This object is achieved in that the exhaust gas line ^: consists of an inner, coiled metal hose, optionally sealed by sealing material; an outer protective cover and a layer arranged between them; heat-insulating, sound-absorbing and vibration-damping materials. ;

The inner metal hose is useful with

wound under gehabten profile "in which one internal damping ι by energy consumption on the relatively moving I ¹ Ia-;. occur Chen," but may also simp _c he folded profiles and profiles with clearing joints using find designed in this inner metal tubes überir.- There are no vibrations, nor do they generate any vibrations and are aerodynamically favorable because of the relatively smooth inner wall

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of eddies entering the flow is another source avoided for the fanning of vibrations

Regarding the materials for the inner metal tube is open to a wide Wa ^ ₁ I because the winding process requires the material other than a normal strain any special properties. For this reason, ferritic rust and acid-resistant stainless steels, which are more resistant to certain exhaust gases, can be used, which are not amenable to deformation into bellows.

The layer of heat-insulating, sound-absorbing material lying between the inner metal hose and the protective cover and vibration-damping materials can be made using heat-resistant materials such as glass, ceramic or asbestos fibers, G-granules, foamed or porous masses produced will. The materials used should fulfill the heat and sound insulation as well as the vibration damping as completely as possible.

The protective cover protects the layer from external influences, e.g. mechanical damage, abrasion, corrosion or moisture, Both metal hoses meet these requirements as well as rubber and plastic covers or folds made of impregnated fabrics or plastics. Non-metallic protective hoses can be vulcanized, glued or sprayed on or clamped with various types of clamps, granular metal hoses or coiled metal hoses preferably used when the layer is made thin and the temperatures are higher than for other materials

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is beneficial <> metal hoses are also useful, if there are also high temperatures outside or if a particular risk of damage or corrosion is to be expected «

In contrast to the well-known wave expansion joints, in which the bellows material used both the influences the flowing gases from the inside, but at the same time also the emptying and the dynamic stress must be able to cope with the renewal according to the elastic exhaust pipe of the inner metal hose ideal for the internal stress caused by temperature and corrosion and the best possible dfce outer shell designed for the external conditions «,

In the drawing, exemplary embodiments of the innovation are shown. Show in the drawing

Pig. 1 shows a partial section through an exhaust pipe and

I ¹ Ig. 2 a longitudinal section through a second embodiment of an exhaust pipe «

The exhaust pipe according to Fig. 1 consists of a wound with untergehaktem profiled metal tube 1, the end-side ends are connected to Book 2 by soldering o _e like _e, on the position _n in the Abgasa the exhaust pipe of a motor vehicle can be integrated ₀ The metal tube 1 is surrounded by a layer 3, which consists of heat-insulating, sound-absorbing and vibration-damping materials. This layer 3 is a protective cover in the form of a metal tube

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4 enclosed, the front ends of which on one to the outside curved flange 5 of the sleeves 2 by soldering or the like «attached

In the modified design according to Figure 2 is the inner coiled metal hose 1 also connected to bushings 2 which carry a connecting flange 6. The metal hose 1 is here from a rubber or plastic hose ? enclosed in the heat-insulating, sound-absorbing and vibration-damping materials are incorporated. the Hose 7 grips over bushes 2 and is fixed to them by clamping rings 8

The necessary connections within the exhaust pipes could also be made by shaped or mechanical Elements take place as they are generally customary in pipeline construction.

As a sealing material for the inner metal hose, if a seal is required, are suitable all heat-resistant materials that come as thread, tape or Wire allow the desired seal. By choosing the material for the seals, the damping properties of the hose and its flexibility can be significantly influenced,

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7638583 08.06.77

Claims (1)

Protection claims ι 1 _# Exhaust pipe for motor vehicles, characterized in that it consists of an inner, wound metal hose (1), optionally sealed by sealing material, an outer protective sheath (4) and a layer (3) between these made of heat-insulating, sound-absorbing and vibration-damping materials - stand 2o exhaust pipe according to claim 1, characterized in that that the inner metal hose (1) is wrapped with the profile hooked under » 3o exhaust pipe according to claim 1 or 2, characterized in that the protective cover (4) is designed as a metal hose, rubber hose, plastic hose or rubber or plastic cover _e 4 * exhaust pipe according to claim 1 or 2, characterized in that the layer of heat-insulating, sound-absorbing and vibration-damping materials and the protective cover are combined to form a unit (7). 7638583 08.0R77