DE2913264A1 - Suction system for multicylinder diesel engine - has branches from manifolds to cylinders in sequence of firing order - Google Patents

Abstract

An eight-cylinder engine has the cylinders arranged in two banks (1-4, 5-8). The suction manifold (11) divides into two main pipes (12, 13) each of which serves on cylinder bank. The branches (1a-4a, 5a-8a) from the main pipes to the cylinder inlets are equally spaced along each main pipe, and come off it in the same order (4-6-7-1, 8-3-2-5) as the firing sequence of the cylinders served. To achieve this one of the pipes (3a, 6a, 7a) cross over each other. The arrangement ensures that there is no reverse flow in any part of the suction system and thus achieves a higher volumetric efficiency which is the same for all cylinders.

Description

Daimler-Benz Aktiengesellschaft Palm T1 / ^

Stuttgart-Untertürkheim March 30, 1979

Suction tube assembly for a
multi-cylinder internal combustion engine
with at least four cylinders,
in particular eight cylinders

The invention is based on a suction pipe arrangement the genre of the main claim.

In addition to the feature of making the individual intake pipes as long as possible, it is important to increase the cylinder charge and therefore also known for the performance of leading the individual intake manifolds to the cylinders as straight as possible in order to keep flow losses as low as possible. But action of this type due to the turbulence still prevailing in the intake system and opposing gas oscillations not the desired optimal air or mixture throughput.

The invention is based on the object in an internal combustion engine to create an intake system of the type described at the outset, in which the aforementioned disadvantage is avoided and in which flows in the same direction prevail along the entire length of each distribution pipe.

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To solve this problem, the features specified in the characterizing part of claim 1 are in the invention provided, still advantageous in the subclaims and beneficial further training is required.

Due to the special measures on the intake system of an eight or six cylinder internal combustion engine, both in the suction pipes as well as in the individual suction pipes orderly flows in only one direction. In addition, pressure vibrations in the same direction form in the intake manifold which further increase the volumetric efficiency.

With the usual intake manifold systems arise in the manifold intake manifold opposing currents due to the series of the Single cylinder, e.g. in a six-cylinder internal combustion engine, according to the cylinder sequence 1-2-3-4-5-6 * For a given Firing order of 1-5-3-6-2-4 you can clearly see the unfavorable arrangement of the individual intake manifolds.

Although it is an intake manifold for an eight-cylinder Internal combustion engine according to DE-OS 25 25 7 <> 9 known at which the flows in the individual manifolds are not in opposite directions, but in this version, because the Ignitions in the individual cylinders of a cylinder bank take place at different time intervals, the currents very uneven.

Embodiments of the invention are shown in the drawing and explained in more detail in the following description. Show it:

Fig. 1 + 2 a schematic representation of an eight-cylinder Internal combustion engine with different ■ intake manifold arrangements and

030043/0070

Pig. 3 + 4 a schematic representation of an eechecylindrical Internal combustion engine with different. Intake manifold assemblies.

In Fig. 1 of the drawing, the cylinders of an eight-cylinder internal combustion engine are denoted by 1 to 8, cylinders 1 to h being combined to form a cylinder bank 9 and cylinders 5 to 8 to form a cylinder bank 10.

The internal combustion engine works according to an ignition sequence 1-5-4-8-6-3-7-2 with an ignition interval of 90 ° CA.

The intake manifold system provided for this internal combustion engine consists of a collecting suction pipe 11 connected to it two distributor pipes 12 and 13 and individual suction pipes 1a to 8a branching off from these.

The branches of the individual suction pipes labeled 1b to 8b are assigned to the cylinders as follows, viewed in the direction of flow:

in each case in the distributor pipe 12 the branch kb to the cylinder h, the branch 6b to the cylinder 6,

the junction 7h to the cylinder 7 »"

branch 1b to cylinder 1

and in each case in the distributor pipe 13 the branch 8b to the cylinder 8, the branch 3b to the cylinder 3, the branch 2b to the cylinder 2, the branch 5h to the cylinder 5

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In this version, the cylinders cross each other and 7 leading individual suction pipes 6a and 7 ». so that di · in Successive branches for each manifold as well as the last one opposite the first branch to the cylinders are assigned, have the same Zundabatand.

Because the row of branches of the individual suction pipes in the direction of flow both in the case of the distributor pipe and in the case of the distributor pipe 13 corresponds to the firing sequence, there can be no opposing currents in both distributor pipes 12, 13 and no congestion over the whole Length of the distribution pipes arise.

This also applies analogously to the exemplary embodiments described below. The eight-cylinder internal combustion engine according to FIG. 2 operates according to an ignition sequence · 1-8-2-7-4-5-3-6 b * i an ignition interval of 90 KW.

The intake manifold system only exists in this internal combustion engine from suction pipes 12, 13 (without collecting suction pipe) and d.arari connected individual suction pipes 1a to 8a.

Here the branches 1b to 8b of the individual suction pipes are assigned to the cylinders - viewed in the direction of flow - as follows :

In the intake manifold 12 the junction Ib to the cylinder 1,

branch 2b to cylinder 2, branch 4b to cylinder h, branch 3b to cylinder 3 '

in the intake manifold 13 the branch 5b to the cylinder 5 »

branch 6b to cylinder 6, branch 8b to cylinder 8, the junction 7b to the cylinder 7

The inventive suction pipe arrangement of a seohszylindersche Internal combustion engine is shown in FIG. 3. here is an ignition sequence 1-5-3-6-2-4 with an ignition interval of 120 ° KW assumed. The cylinders arranged in a row are designated with positions 1 to 6.

The suction pipe system comprises two suction pipes 12, 13 (without collecting suction pipe) and individual suction pipes 1a to 6a branching off from these suction pipes.

The branches following one another in the direction of flow are the cylinders

1 to 6 assigned as follows, namely in the suction pipe the junction 3b to the cylinder 3 »

the branch 2b to the cylinder 2

the junction Ib to the cylinder 1 '

and in the suction pipe 13 *

the branch 4b to the cylinder h
the branch 5b to the cylinder 5
the junction ^ 6b to the cylinder 6.

The inlet openings of the two suction pipes 12, 13 thus lie opposite one another.

If necessary, the suction pipe system according to FIG. 3 can be provided with a collecting suction pipe.

The suction pipe system according to FIG. K comprises a collecting suction pipe 11, two distributor pipes 12 and 13 branching off from this, and individual suction pipes 1a to 6a branching off from the distributor pipes and leading to the cylinders. The two distributor pipes 12, 13 are - viewed in the longitudinal direction of the cylinder bank 7 - one behind the other, while the collecting suction

030Ö4S / OÖ70

pipe 11 next to the distributor pipe 12 placed iat.

In this intake manifold system, the branches 1b to 6b of the individual intake manifolds that follow one another in the direction of flow 1a to 6a assigned to the cylinders 1 to 6 eo that in the one distributor pipe 12 branch 1b to cylinder 1, branch 3b to cylinder 3> the branch 2b to the cylinder 2

and in the other manifold branch 4b to cylinder k, branch 5b to cylinder 5> branch 6b to cylinder 6

assigned.

In this system, two of the six individual suction pipes 1 a to 6 a, namely those branching off in the distributor pipe 12, intersect Single suction pipes 2a and 3a.

A further improvement in the filling can be achieved in this way - A prerequisite, however, is adequate space - that the individual exhaust pipes are analogous to the intake pipes are adapted in their arrangement.

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L e r s e i t e

Claims (5)

Daimler-Benz Aktiengesellschaft Palm 11 428/4 Stuttgart-Untertürkheim March 30, 1979 Expectations 1J intake manifold for a multi-cylinder internal combustion engine with at least four cylinders, in particular eight cylinders, with intake manifolds assigned to cylinder groups, which may emanate from a collecting suction pipe, and connected to the suction pipes and to the * cylinders leading individual suction pipes that are at least approximately equal in length, characterized in that in each suction pipe (12, 13) in Direction of flow corresponds to the sequence of the branches of the individual intake manifolds of the ignition sequence and that for each suction pipe (12, 13) successive branches as well as the last opposite the first branch Cylinders with the same firing intervals are assigned. 2. intake manifold according to claim 1 for an eight-cylinder Internal combustion engine with V-arrangement of the rows of cylinders and 90 crankshaft offset with an ignition sequence 1-8-2-7-4-5-3-6, characterized in that that of the four on the suction pipes (1-2,13) 030043/0070 ORIGINAL INSPECTED connected individual suction pipes (la to 4a; 5a to 8a) two individual suction pipes (3a, 4a; 7a, 8a) located at the rear in the direction of flow, which support the cylinders (3, 4; 7, 8) are assigned to cross each other. 3 · intake manifold according to claim 1 for an eight-cylinder Internal combustion engine with V-arrangement of the rows of cylinders and 90 crankshaft offset with a firing order of 1-5-4-8-6-3-7-2 and with a manifold intake manifold and intake manifolds as distribution pipes, characterized in that from each cylinder row (9 »10) the external individual suction pipes (la, 4a and 5a »8a) on the nearest manifold (12, I3) and the internal individual suction pipes (3a »2a and 6a, 7a) connected to the respective other distributor pipe (13, 12) are, whereby the inner single tubes (6a, 7a) the one cylinder bank 0 °) cross each other. 4. intake manifold according to claim 1 for a six-cylinder internal combustion engine with 120 crankshaft offset and an ignition sequence 1-5-3-6-2-4, characterized in that two suction pipes (12, 13) » one of which is the individual intake manifolds (la, 2a, 3a) and the other is assigned to the individual suction pipes (4a, 5 * »6a) is to have entry openings that are opposite each other. 5. suction pipe assembly according to claim 1 and 4 with a collecting suction pipe and with suction pipes as distribution pipes, characterized in that of the three each connected to the two distribution pipes (12, I3) Single suction pipes (la, 2a, 3a and 4a, 5a, 6a) the two individual suction tubes (2a, 3a) lying behind the first single suction tube (la) in the direction of flow, the the cylinders (2, 3) are assigned to cross each other. 030Ö43 / OÖ7Q ORIGINAL INSPECTED