DE102007042872A1 - Internal combustion engine has cylinder head, manifold flange, particularly exhaust manifold flange, which is positioned with bearing surface at cylinder head of internal combustion engine - Google Patents

Abstract

The invention relates to an internal combustion engine with a cylinder head (1), a manifold flange (2), in particular Abgaskrümmerflansch which rests with a contact surface (3) on the cylinder head (1) of the internal combustion engine, and a secondary air supply (4) connected to a gas duct (5 ) of the internal combustion engine is connected, wherein the manifold flange (2) and the secondary air supply (4) by means of a common fastener (6) are fixed to the internal combustion engine and the secondary air supply (4) with a first contact surface (7) on the manifold flange (2). The task of providing a Abgaskrümmerflansch with a secondary air supply (4), which can be relatively easily finished and has a low weight high reliability in operation and allows individual use of different types of engine, with a secondary air supply (4), except the first contact surface (7) on the Krümmerflansch (2) with a second contact surface (8) against the cylinder head (1) of the internal combustion engine, solved.

Description

The The invention relates to an internal combustion engine with a cylinder head, a manifold flange, in particular Abgaskrümmerflansch, the with a contact surface on the cylinder head of the internal combustion engine is present, and a secondary air supply, with a Gas duct of the internal combustion engine is connected, wherein the manifold flange and the secondary air supply by means of a common Fixing element are fixed to the internal combustion engine and the secondary air supply with a first contact surface abuts the manifold flange.

to Reducing the environmental impact of exhaust gases from internal combustion engines Among other things, two measures successfully implemented: one of the regular in internal combustion engines built-in catalyst. This fulfills its pollutant minimizing Function, however, only from higher operating temperatures. Therefore especially in the cold start phase so-called secondary air fed into the combustion chamber. The in the secondary air contained oxygen leads to an increase in the heat of combustion of the fuel, resulting in faster heating of the catalyst can be used. As a second measure, after the catalyst reaches its operating temperature and thus its full effect has reached, to further minimize pollutant emissions Exhaust gas, respectively combustion product in the combustion chamber of Internal combustion engines returned. hereby is the emission of undesirable exhaust gas constituents, such as nitrogen oxides (NOx) and sulfur oxides (SOx), reduced.

The secondary air supply for the internal combustion engine is generally via lines that are part of the exhaust manifold. The DE 42 14 796 A1 shows such exhaust manifold or exhaust manifold with secondary air system for rapid heating of the exhaust gas catalyst system with a cast-in the engine flange of the exhaust manifold end-closed steel pipe. The production of a one-piece Abgaskrümmerflansches with integrated gas channel is complex and therefore expensive.

It is still through the DE 199 40 140 A1 an exhaust manifold for an internal combustion engine is known, comprising a gas channel, which is formed of two gas-tight interconnected shell elements. This gas passage is attached to the exhaust manifold flange. Basically, a separate gas duct made of simple molded parts is inexpensive to install. With such a two-part gas channel, however, the number of parts to be installed is increased. At the same time, different gas channels must be provided for geometrically different flanges. A large variety of parts and the associated logistical effort in the production and spare parts supply relativize the cost advantage.

in the Mechanical engineering are clamps for fastening, or fasteners, the friction by means of individual parts in their relative position to each other fix, generally known. The execution of a clamp in elongated form as a so-called terminal block is also off known in the art.

Of the Invention is based on the object, a Abgaskrümmerflansch to provide with a secondary air supply, which comparatively easy to manufacture and at a low weight high reliability in operation owns as well as an individual employment at different engine types allows.

These The object is solved by the features of claim 1. In the subclaims are advantageous and expedient Further developments of the internal combustion engine according to the invention specified.

The The invention is based on an internal combustion engine with a manifold flange and a secondary air supply, in which the secondary air supply is connected to a gas channel of the internal combustion engine, the manifold flange and the secondary air supply by means of a common fastening element on the internal combustion engine can be fixed, the secondary air supply with a first contact surface can be applied to the manifold flange is. The essence of the invention lies in the fact that the secondary air supply with a second contact surface on the internal combustion engine, preferably can be applied to the cylinder head. By such Arrangement, it is possible a secondary air supply produce with comparatively low weight without soldering, at the same time the function of a terminal block, namely the fixation of the manifold flange on the internal combustion engine takes over. The device according to the invention combines two Functions in a rugged and flexible component, which is easy and thus economically producible.

Advantageous it is that the manifold flange by means of the secondary air supply can be fixed to the internal combustion engine. This makes it possible that the supply of secondary air into the gas channel regardless of the type and geometry of the manifold can be done.

For the use of Sekundärluftversor tion for fixing different manifolds and / or Krümmerflansche to the internal combustion engine, it is advantageous that the secondary air supply is connected to the gas passage by means of a recess, in particular a bore in the secondary air supply and in the cylinder head in the region of the second contact surface. As a result, an independent of the configuration of the manifold and / or Krümmerflansches supply of secondary air from the secondary air supply into the gas duct is possible. The manifold and / or manifold flange according to the invention must have no secondary air supply or recesses.

Cheap it is that the secondary air supply clamp-like with a closed end and / or rotationally symmetrical tubular cavity is formed. This makes it possible the secondary air supply from a standardized pipe material manufacture. Alternatively, for the production of the extrusion process be used.

For the mechanical fixation of the manifold flange is favorable, that the first contact surface of the secondary air supply and the contact surface of the manifold flange to each other are inclined and that the first contact surface and the second contact surface the secondary air supply are inclined to each other. hereby It is possible when fixing the manifold flange to exert a force on the manifold flange, the a component parallel to the contact surface of the manifold flange having.

The Task is further solved by a secondary air supply for an internal combustion engine with a cylinder head, with a first contact surface on a manifold flange is applied, according to the invention, the secondary air supply with a second contact surface on the internal combustion engine, in particular on the cylinder head of the internal combustion engine, can be applied is. This makes it possible, a secondary air supply at the same time the function of a terminal block, namely the fixation of the manifold flange the internal combustion engine takes over.

The Device according to the invention combines two functions in a robust and flexible component, which is simple and therefore is economically inexpensive to produce.

The Invention allows for numerous embodiments. To further clarify its basic principle, one of them is in the drawing and will be described below.

This shows a sectional view of an internal combustion engine with a cylinder head 1 , a secondary air supply 4 and a manifold flange 2 , It is of the internal combustion engine, only the cylinder head 1 represented by a gas channel 5 for the transport of the exhaust gases from the combustion chamber of the internal combustion engine leads. Furthermore, in the gate is a manifold 11 to recognize, the manifold flange 2 by means of the secondary air supply 4 on the cylinder head 1 is fixed. The secondary air supply 4 is by means of fasteners 6 as an independent component with the manifold flange 2 on the cylinder head 1 fixed. This is the manifold flange 2 between the secondary air supply 4 and the cylinder head 1 fixed by means of clamping action. The secondary air supply 4 lies with a first contact surface 7 on the manifold flange 2 and with a second contact surface 8th on the cylinder head 1 the internal combustion engine. In the area of the second contact area 8th have the secondary air supply 4 and the cylinder head recesses 9 . 10 on, by means of which the secondary air supply 4 and the gas channel 5 are connected.

The manifold 11 is for example in his in accordance with figure opposite or above the secondary air supply 4 arranged area with a z. B. obliquely inserted screw as a fastener 6 on the cylinder head 1 held while using a secondary air supply 4 enforcing, another screw this terminal block-like secondary air supply 4 the manifold 11 finally fixed.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 4214796 A1 [0003]
• - DE 19940140 A1 [0004]

Claims (9)

Internal combustion engine with a cylinder head ( 1 ), a manifold flange ( 2 ), in particular Abgaskrümmerflansch, with a contact surface ( 3 ) on the cylinder head ( 1 ) of the internal combustion engine, and a secondary air supply ( 4 ) connected to a gas channel ( 5 ) of the internal combustion engine is connected, wherein the manifold flange ( 2 ) and the secondary air supply ( 4 ) by means of a common fastening element ( 6 ) are fixed to the internal combustion engine and the secondary air supply ( 4 ) with a first contact surface ( 7 ) on the manifold flange ( 2 ) is applied, characterized in that the secondary air supply ( 4 ) in addition to the first contact surface ( 7 ) on the manifold flange ( 2 ) with a second contact surface ( 8th ) abuts the internal combustion engine. Internal combustion engine according to claim 1, characterized in that the manifold flange ( 2 ) by means of the secondary air supply ( 4 ) is fixed to the internal combustion engine. Internal combustion engine according to claims 1 or 2, characterized in that the secondary air supply ( 4 ) with the gas channel ( 5 ) by means of a recess ( 9 . 10 ), in particular a bore, in the secondary air supply ( 4 ) and in the cylinder head ( 1 ) in the region of the second contact surface ( 8th ) connected is. Internal combustion engine according to at least one of the preceding claims, characterized in that the secondary air supply ( 4 ) an end-closed cavity ( 12 ) having. Internal combustion engine according to at least one of the preceding claims, characterized in that the secondary air supply ( 4 ) a rotationally symmetric cavity ( 12 ) having. Internal combustion engine according to at least one of the preceding claims, characterized in that the first contact surface ( 7 ) of the secondary air supply ( 4 ) and the contact surface ( 3 ) of the manifold flange ( 2 ) are inclined to each other. Internal combustion engine according to at least one of the preceding claims, characterized in that the first contact surface ( 7 ) and the second contact surface ( 8th ) of the secondary air supply ( 4 ) are inclined to each other. Internal combustion engine, characterized in that the second contact surface ( 8th ) between secondary air supply ( 4 ) and cylinder head ( 1 ) is trained. Secondary air supply ( 4 ) for an internal combustion engine with a cylinder head ( 1 ), which have a first contact surface ( 7 ) on a manifold flange ( 2 ) is applied, characterized in that the secondary air supply ( 4 ) with a second contact surface ( 8th ) on the internal combustion engine, in particular on the cylinder head ( 1 ) of the internal combustion engine, can be applied.