DE2111806A1 - Exhaust system for a multi-cylinder internal combustion engine - Google Patents

Description

Exhaust system for a multi-cylinder internal combustion engine

The invention relates to internal combustion engines and "relates in particular to an exhaust system for a multi-cylinder internal combustion engine

In a multi-cylinder internal combustion engine, it is known to be desirable and advantageous, or to guide the leading of the exhaust valves to the outside air exhaust passages in the manner _o to arrange that the discharge timing of the non those influences a cylinder of another cylinder or impaired "For example, such an arrangement for Guarantee of the aforementioned condition for each cylinder a separate pipe leading to the outside air on »

Also, a satisfactory arrangement which prevents interference of the exhaust stroke of the one cylinder with the Avoids exhaust stroke of another cylinder * from one each separate tube for each cylinder, for example a six- or eight-cylinder machine, these Pipes to a collecting line leading to the outside air with about 2.8 to 4 times the cross-sectional area

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each individual pipe with a cross-sectional area, and being this manifold in "one not less than." For example, the distance to the outside air, which is 8 times the diameter of the individual pipes »

Conversely, it is known to be undesirable and disadvantageous to connect each individual outlet slot to the outside air via a manifold or an exhaust manifold, the effective length of each individual line roughly corresponding to the distance between the exhaust valve seat or the exhaust valve seats in the cylinder head casting from its outer surface or being slightly larger than corresponds to this distance, d _o h, the length of existing in the cylinder head casting outlet channel "

Particularly in the case of a standing-line four-stroke internal combustion engine having six or eight cylinders, for use as a driving engine for a Strfoenfahrzeug it is because of space limitations not practically possible to apply one of the two orders mentioned "In the former arrangement, it is not only virtually impossible to _9, the six or Eight exhaust pipes between the vehicle body and the internal combustion engine down, but also six or eight separate silencers must be provided. In the second arrangement, although a single silencer can be connected to the manifold, thereby eliminating the disadvantage of the arrangement of six or eight silencers required in the first-mentioned construction, more space is required for the merging of the six or eight pipes into one manifold than it is normally available between the body parts and the internal combustion engine "

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The object of the invention is therefore primarily to create a multi-cylinder internal combustion engine in which an interference of the exhaust stroke of one cylinder with the exhaust stroke of another cylinder is eliminated or is avoided and in which the disadvantages of the two aforementioned arrangements are avoided *

The essence of the invention consists in the exhaust ports of the cylinders of a multi-cylinder internal combustion engine to be arranged in pairs and such a firing order to choose for the machine that the cylinders of each pair perform their exhaust cycle at different times, thereby avoiding exhaust cycle interferences »

More specifically, the invention provides an exhaust system for a multi-cylinder internal combustion engine, its specialty consists in that several separate exhaust pipes are connected to a collective exhaust pipe, which in turn is connected to a silencer - that each individual exhaust pipe is connected or can be connected to the outlet slots of a pair of cylinders and that the ignition sequence of the internal combustion engine is chosen such that the exhaust strokes of the cylinders of each pair do not occur simultaneously appear*

In one embodiment of the invention, the cylinders a six-cylinder upright in-line four-stroke engine with the first and sixth, second and fifth respectively as well as the third and fourth cylinders assigned to one another in pairs, while the firing order is according to one of the following Schemes can be chosen:

12 3 6-54-12 4 6 5 3
153624 '

15 4 6 2 3

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When the machine rotates in the opposite direction, the following four firing orders can be selected when using the same crankshaft:

14 5 6 3 2

13 5 6 4 2

14 2 6 3 5
13 2 6 4 5

In a modified arrangement, the cylinders of an eight-cylinder vertical in-line four-stroke machine are each with the first and fourth, the second and third, the fifth and eighth as well as the sixth and seventh cylinders are assigned to each other in pairs and the firing order 1,5,2,6,8,4,7 and 3 selected «If the machine runs in the opposite direction using the same crankshaft, the firing order is 1, 3, 7 ', 4> 8, 6, 2 and 5ο

Optionally, the first and third, second and fourth, fifth and seventh as well as sixth and eighth cylinders can be assigned to each other in pairs, while the firing order depends on the direction of rotation of the engine 1, 6, 2, 5, 8 , 3, 7 and 4 or 1 »4» 7 i 3, 8, 5, 2 and 6 is selected.

The following are preferred embodiments of the invention explained in more detail using the drawings. Show it:

Pig »1 is a perspective view of an eight-cylinder vertical in-line internal combustion engine with the Features of the invention,

2 is an enlarged scale detail view of the lower part of the exhaust system _s

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Pig. 3 and 4 are an exploded perspective view Representation or «, a section through a device to attach the exhaust system to the Brennkraftmascntne and

Figures 5 and 6 are a schematic side view and a Front view of a six-cylinder standing In-line braking power machine with the characteristics the invention"'

In Figs. 1 and 2 an eight-cylinder upright rel- hen internal combustion engine 10 of the four-stroke type more conventional Design shown as a prime mover for a non the road vehicle shown serves,

Your internal combustion engine has four separate, small ones Exhaust pipes 11 having internal diameters, each connected to the exhaust pipe by means of a pipe member 13. zen 12 of another pair of cylinders are connected. the individual exhaust pipes 11 are at a distance that is not less than eight times the diameter of one of these four thin, separate exhaust pipes 11, to one A collective exhaust pipe 14 having a large inner diameter connected via a single silencer 15 (Pig »6) or over two or more, one after the other« switched silencer leads to the outside air.

The relative bore diameter of the thinner exhaust pipes 11 is a minimum of $ 30 and a maximum of $ 75 des ßohrungsdurchmossers of the further exhaust line,

The cylinders can be in the order 1 and 4, 2 and 3 » 5 and ü as well as 6 and 7 be assigned to each other in pairs,

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while the firing order depends on the direction of rotation of the engine 1, 5, 2, 6, 8, 4, 7 and 3 or 1, 3, 7, 4, 3, 6, 2 and 5.

Optionally, the cylinders can be arranged in the order 1 and 3 » 2 and 4, 5 and 7 as well as 6 and 8 can be assigned to one another in pairs, while the firing order depends on the direction of rotation the machine is selected in the order 1, 6, 2, 5, 8, 3 »7 and 4 or 1, 4, 7» 3, 8, 5, 2 and 6.

As a result of the arrangement according to the invention, there is no inter " Reference or mutual influence between the exhaust strokes of the individual cylinders is possible «

The pipe sections 13, i.e. "the exhaust manifold, are open" conventional manner attached to the outlet slots 12 and flanged to the exhaust pipes 11.

Between the internal combustion engine and the lower part of the puffanlage, a heat shield 16 is screwed to the machine, with rubber mountings on the screw bolts Avoidance of crankcase noise are provided »

The exhaust system is on the lower part of the internal combustion engine by means of a bracket 17 and a mounting arrangement 18 screwed, of which the latter has a support plate 19, which at 20 via an adjustment plate 21 on the Internal combustion engine 10 is screwed on "

On the support plate 19, a spindle 22 is attached to its outer end is provided with a thread and on which the holder 17, which is provided with a wedge spring base seat 23 attached between two dome-shaped rings 24 1st »

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The rings 24 lie in a parm-shaped recess

25 of the support plate 19 and in a pan-shaped sleeve

26 * on which a spring 27 held by an adjusting nut IQ and a counter nut 29 is placed ₀

This resilient domed mounting of the bracket 17 facilitates the cultivation of the exhaust system and allows expansion the same in the longitudinal direction, but not in the transverse direction of the internal combustion engine to "

5 and 6 is a six-cylinder vertical in-line internal combustion engine the four-stroke design, which is intended as a prime mover for a road vehicle and, with the exception of the number of cylinders, practically the Internal combustion engine according to the Pig · 1 to 4 corresponds.

Three separate, small inner diameter having exhaust pipes 30 are each to the outlet slots 31 one connected to another pair of cylinders. These separate from * Puff pipes 30 are at a distance of at least that Eight times the diameter of one of these three thinner exhaust pipes 30 is, to have a large diameter Collective exhaust line 32 connected, which over a single silencer 15 or two or more, silencers connected downstream leads to the outside air «

The relative bore diameter of the thinner exhaust pipes is at least $ 35 and a maximum of $ 90 of the bore diameter the further exhaust line.

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The cylinder pairing is 1 and 6, 2 and 5 as well as 3 and 4 » ^and depending on the direction of rotation of the internal combustion engine, the firing order can be selected as follows:

12 3 6 5 4

12 4 6 5 3

15 3 6 2 4

15 4 6 2 3

1 4th 5 6th 3 2 1 3 5 6th 4th 2 1 4th 2 6th 3 5 1 3 2 6th 4th 5

As a result of the training according to the invention there is no interference or »mutual influence between the exhaust strokes of the individual cylinders is possible.

As a result of this pairing the cylinder has exhaust pipes the internal combustion engine increased power and becomes a noise reduction and possibly one less non-pulsating characteristic achieved.

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Claims (1)

Godfather tans ρ rühe Exhaust system for a multi-cylinder internal combustion engine, characterized in that the outlet slots (12; 31) the machine cylinder is exhausted or cycled on « are otherwise assigned in pairs and that the engine (10) has such a firing sequence that the exhaust stroke the cylinders of each pair in order to eliminate the interference of the exhaust stroke at different times he follows", 2 _e exhaust system for a multi-cylinder internal combustion engine, characterized in that several separate exhaust pipes (11 j 30) are connected to a collective exhaust pipe (14; 32) "which in turn is connected to a silencer (15), so that each individual exhaust pipe (11 »30) is connected or can be connected to the outlet slots (12; 31) of a pair of cylinders and that the firing order of the internal combustion engine (.10) is selected in such a way that the exhaust strokes of the cylinders of each pair do not occur simultaneously» 3 * exhaust system according to claim 1 or 2 in particular for a six-cylinder upright in-line internal combustion engine the four-stroke type, characterized in that the first and the sixth, the second and the fifth and third and fourth cylinders in the exhaust system are assigned to one another in pairs and that the internal combustion engine (10) in the one rotation «. - ιο 09846/1141 direction of the crankshaft has the following firing order ": 1 .2 3 6 5 4 12 4 6 5 3 15 3 6 2 4 15 4 6 2 5 while in the other direction of rotation of the crankshaft has the following firing order: 14 5 6 3 2 13 5 6 4 2 14 2 6 3 5 13 2 6 4 5. 4 «Exhaust system according to claim 1 or 2 for an eight- Cylindrical standing in-line internal combustion engine of the four-stroke * »type, characterized in that in each case the first and fourth, the second and the third, the fifth and the eighth and the sixth and the seventh cylinders in the exhaust system are assigned to one another in pairs and that the internal combustion engine (10) the firing order 15 2 6 8 4 7 3 in one direction of rotation of the crankshaft and in the other direction of rotation of the crankshaft the firing order has 1 3748625, 5-cylinder standing-leg internal combustion engine of the four-stroke type according to claim 1 or 2, characterized in that the first and third _9, second and fourth, fifth and seventh and sixth and eighth cylinders are assigned to one another in pairs and that it has the firing order 1 6 2 5 8 3 7 4 or 14 7 3 8 5 2 6 depending on the direction of rotation of the crankshaft. -11- 109846 / 1U1 -ti- 2111 BOSS 6 * Multi-cylinder internal combustion engine according to one of the preceding Claims, characterized in that between see the internal combustion engine (10) and the exhaust system a rubber heat shield (16) is inserted 7, e multi-cylinder internal combustion engine according to one of the preceding Claims, characterized in that the exhaust system at the lower end of the internal combustion engine (10) by means of a resilient spherical bearing, (26, 24 » 28, 29, 27) is mounted. «Ο ο e« φ 10 9 8 46/1141