DE202006010537U1 - Combustion engine for a vehicle comprises an intake line coupled with an exhaust gas line in an acoustically permeable and gas-tight manner - Google Patents

Abstract

Combustion engine (10) comprises an intake line (19) coupled with an exhaust gas line (24) in an acoustically permeable and gas-tight manner. Preferred Features: The intake and exhaust gas lines are connected together in a gas-tight manner using an elastic separating wall or membrane (29). An extension tube (27, 28) to connected to both the intake and exhaust has lines on the side of the engine block. The free ends of the tube are joined together via a separating wall or membrane. The extension tubes are welded together via the separating wall or membrane.

Description

The The invention relates to an internal combustion engine according to the preamble of claim 1.

One Internal combustion engine used to drive vehicles one or more combustion chambers, which fresh gas or generally a fuel-air mixture is supplied, which over an intake pipe, one of which corresponds to the number of combustion chambers Number of intake pipes to each cylinder or combustion chamber guided are fed to the combustion chambers. Close on the exhaust side to each combustion chamber manifold pipes on, which lead into an exhaust pipe leading to a muffler assembly guided is. By "fuel" is meant a fluid, the gaseous or as a kind of aerosol is burned in the combustion chamber and the Drive the pistons of the internal combustion engine is used for the constructive solution These intake and exhaust arrangements can be considered as two problems to be pulled. On the one hand by regulations z. B. in the street or Aviation law, a sufficient reduction in the case of combustion generated operating noise required so that the environment is not too much due to the combustion noise and the noises, which are due to the pulsating combustion when flowing out, is harassed. On the other hand it is known that internal combustion engines with different Number of cylinders produce different sounds and that sometimes desired by the customer is that an engine with four cylinders, for example, should sound like that, as if he were a six- or eight-cylinder engine.

Usually is the soundproofing by means of its own, the exhaust pipe or the exhaust pipe assigned Sound attenuation system causes. The adaptation of engine noise to this general to name, to possibly customer requests is determined by appropriate length and cross-sectional design of the exhaust pipes, in which the exhaust manifolds open, made.

task The invention is a further possibility for influencing the engine noise.

These The object is achieved by the Characteristics of claim 1 solved.

Further advantageous improvements and embodiments of the invention are the dependent claims refer to.

In accordance with the invention the feed or Intake manifold with the exhaust pipe gas-tight coupled to each other, wherein only an acoustic exchange, but not a gas exchange to be held. This means, that the intake noise occurring in the intake in the exhaust pipe Existing exhaust noise complete and / or interference, and vice versa.

The Both lines are doing with the interposition of an elastic partition coupled with each other. The partition serves gas flows from one side to the other side, i. from the intake side and To avoid exhaust side or vice versa.

The Partition may preferably be made as an elastic membrane of a heat-resistant material be formed, which is not damaged by the exhaust gas temperatures.

Based the drawing, the invention and further embodiments and improvements of the invention and other advantages explained in more detail and to be discribed.

The FIG. 1 shows a purely schematic view of an internal combustion engine.

The internal combustion engine 10 has four cylinders 11 . 12 . 13 . 14 to which intake manifolds 15 . 16 . 17 . 18 Lead by a suction pipe 19 to the individual cylinders 11 , ... 14 branch. On the exhaust side close to each cylinder 11 , ... 14 Abgaskrümmerrohre 20 . 21 . 22 . 23 An in an exhaust manifold 24 leading to a muffler or simply to an exhaust. The intake and exhaust pipes or pipes 19 . 24 run approximately parallel to the connecting line of the cylinder 11 , ... 14 on both sides; the areas 25 . 26 , which with z. As a carburetor or are connected to a muffler, are on one side of the juxtaposition of the cylinder 11 to 14 ,

Both in the access line 19 as well as in the exhaust pipe 24 There are intake or exhaust noises during operation, which are pulsating and because of their volume are very disturbing. Inevitably, the exhaust noise due to the combustion processes in the combustion chamber are significantly louder than those in the intake.

To influence the intake and exhaust noises close to the intake and exhaust pipe 19 . 24 on the carburetor or silencer side opposite side of the engine 10 , in each case a connecting line, based on the connecting line of the cylinders 27 and 28 , also extension tubes 27 and 28 called, whose free ends directed against each other and with the interposition of an elastic partition or membrane 29 are connected to each other in a gastight manner.

The membrane 29 Due to its elasticity, it transmits sound from the intake side to the exhaust side and vice versa, whereby gas flow from one side to the other side, ie from the intake side to the exhaust side and vice versa, is prevented.

With this transmission of sound, in particular the intake side to the exhaust gas side can in the region of the exhaust pipe 24 existing pulsating noises are additionally influenced by the harmonic spectrum is changed by suitable acoustic filters as the user of the vehicle wishes.

The invention has been described with reference to a four-cylinder engine. Of course, an influence of one side can be achieved by the other also in engines having less than or more than four cylinders. Also, the connection between the exhaust and suction can be done in a variety of ways and at different positions of intake 25 and exhaust system 26 , where the energy is greater, the closer to the engine 10 ; essential are a gas tightness and the presence of a partition wall or membrane between both sides to prevent gas flow from one side to the other.

Claims (4)

Internal combustion engine ( 10 ), with at least one cylinder ( 11 . 12 . 13 . 14 ) having engine block, at the intake side intake manifolds ( 15 . 16 . 17 . 18 ) and at its exhaust side exhaust manifolds ( 20 . 21 . 22 . 23 ) are provided, wherein the intake manifolds ( 15 . 16 . 17 . 18 ) from a suction line ( 19 ) and the exhaust manifolds ( 20 . 21 . 22 . 23 ) in an exhaust manifold ( 24 ), and wherein via the intake ( 19 ) a fuel-air mixture can be supplied and via the exhaust pipe ( 24 ) the combustion gases are dissipatable in particular to a silencer and exhaust, characterized in that the intake and exhaust pipes ( 19 . 24 ) are coupled together acoustically permeable and gas-tight. Internal combustion engine according to claim 1, characterized in that the intake and exhaust pipes ( 19 . 24 ) with the interposition of an elastic partition wall or membrane ( 29 ) are connected to each other gas-tight. Internal combustion engine according to one of the preceding claims, characterized in that on the intake and exhaust pipe ( 19 . 24 ) on the side of the engine block each an extension tube ( 27 . 28 ) whose free ends are joined together with the partition wall or membrane ( 29 ) are interconnected. Internal combustion engine according to one of claims 1 to 3, characterized in that the extension tubes ( 27 . 28 ) with interposition of the dividing wall or membrane ( 29 ) are welded together.