DE3312818A1 - Engine scavenging or crankcase ventilation for internal combustion engines - Google Patents

Abstract

In an engine scavenging or crankcase ventilation system for internal combustion engines, having a hose which carries the crankcase gases via a pressure-dependent valve into a vacuum zone of the internal combustion engine, the hose (7) carrying the crankcase gases is passed via a valve housing (9) with a flutter valve (10) and connection parts (11 and 12) into that region (2) of the exhaust pipe (3) of the internal combustion engine in which there is periodically a vacuum. <IMAGE>

Description

Engine ventilation or crankcase ventilation

for internal combustion engines The invention relates to an engine or crankcase ventilation for internal combustion engines in the preamble of the claim 1 explained Art.

From DE-OS 24 52 785 a motor ventilation or crankcase ventilation is already known for internal combustion engines of this type, in which bercits elie disruptive influences the crankcase gases on the mixture preparation in the intake system of the internal combustion engine were recognized and by a catalyst device switched on in the train of the hose line were eliminated. The catalyst device had to be in a heat-exchanging manner Arrangement can be arranged with the exhaust system of the internal combustion engine to the to ensure the required operating temperature.

This known engine or crankcase ventilation thus avoids Faults in the intake system of the internal combustion engine, as otherwise caused by the supply of crankcase gases that contain unburned fuel and lubricating oil components, may occur. The technical effort required for this is, however, proportionate great.

From DE-OS 28 01 837 a crankcase ventilation valve for Internal combustion engines known, which is designed in the manner of a flutter valve.

In the case of (lie.sem lillrl) el housing breather valve, the crankcase noses are with their disruptive proportions of unburned fuel and lubricating oil the intake system of the internal combustion engine.

From DE-OS 19 30 690 a crankcase hose line is known, which acts as a flutter valve in a partial area. Here, too, the crankcase gases led back into the intake system of the lgrennkraftmaschine.

The object of the invention is to provide a motor vent or Kurhel housing vent to improve for internal combustion engines of the type explained in such a way that the disruptive impairment of the intake system of the internal combustion engine by the crankcase gases avoided in the simplest possible way.

According to the invention, this object is achieved by a motor through- or crankcase ventilation for internal combustion engines in the preamble of the claim 1 has the characteristics shown in its identification part.

In claims 2 to 5 there are further expedient refinements the invention explained.

Due to the fact that the line leading the crankcase gases into a, a periodic negative pressure area of the Aii spuffleitung of the internal combustion engine is performed, the desired suction effect for the crankcase gases is achieved, however, the gases are drawn directly from the hot exhaust gases within the exhaust pipe oxidized.

The fact that a hose line leading the crankcase gases directly is designed as a flutter valve, a minimal construction effort is required.

By having a hose line over a flutter valve Valve housing directly behind an exhaust valve in the exhaust manifold or in the exhaust port of the cylinder head of the internal combustion engine is performed at A more robust design can be achieved with a minimum of effort.

Because the hose line leading to the crankcase gases iib <'r distribution lines to two or more valve housings, the required suction effect can be ensured.

In that the arrangement within the engine, e.g. B. through in the cylinder head formed channels takes place, the cost can be further reduced.

The invention is illustrated by means of one in the accompanying drawing preferred embodiment example explained in more detail.

The figure shows a view of the arrangement of the motor through or

Ku rbelgehliu seentlü ftung of the invention with partial cut areas.

A cylinder head 1 is shown in the area in which a directly Exhaust duct 2 coming from an exhaust valve (not shown) into one on the cylinder head 1 flanged exhaust manifold 3 leads.

The normally arranged in the cylinder head 1 of the internal combustion engine The valve drive is arranged in a space 4 which is essentially formed by a valve cover or a cylinder head cover 5 is enclosed.

Since usually in an engine ventilation or crankcase ventilation the chamber 4 accommodating the valve train is always included, is at the Cylinder head cover 5 a connection piece 6 is provided through which a hose line 7 crankcase gases leads directly to a connection piece 8 on the exhaust manifold 3.

In the exemplary embodiment shown, the hose line 7 is not itself designed as a flutter valve but consists of a simple hose part and a valve housing 9, in the interior of which a flutter valve 10 is arranged and Both ends of which are designed as connecting parts 11 and 12.

By arranging the flutter valve 10 in a valve housing 9, the connection to the connection piece 8 of the hot exhaust manifold can have a safe Threaded connection 12 take place, while the connection to the connection piece 6 via a simple hose connection 11 can be made.

In a particularly advantageous manner, the required channels be formed directly in the cylinder head and corresponding flutter valve inserts be arranged in these channels, so that no additional hose lines must be provided.

Research has shown that although the mean pressure in the exhaust system an internal combustion engine is an overpressure, especially close behind the exhaust valve a pressure curve occurs which has a considerable negative pressure peak. These Vacuum peak is exploited according to the invention to over the crankcase gases suction the flutter valve.

Depending on the pressure conditions of an engine, i. H. depending on the attack of so-called bypass or crankcase gases may need two or more Flutter valves are arranged behind each different exhaust valve so The necessary negative pressure is ensured at the legally prescribed load points will.

As an experiment with such an engine or crankcase ventilation Equipped internal combustion engines were already over 10,000 while driving Kilometers used with a satisfactory result.

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Claims (5)

Claims 1. Engine ventilation or crankcase ventilation for internal combustion engines, with one the crankcase gases via a pressure-dependent valve in a negative pressure having area of the internal combustion engine leading line, characterized in that that the crankcase gases leading line (7) in one, a periodic Out of the region of the exhaust line (3) of the internal combustion engine exhibiting negative pressure is. 2. engine ventilation or crankcase ventilation according to claim 1, characterized characterized in that a hose line is designed directly as a flutter valve is. 3. engine ventilation or crankcase ventilation according to claim 1, characterized characterized in that a hose line (7) via a valve housing (9) which is a Contains flutter valve (10) and has two connecting parts (11 and 12), directly behind an exhaust valve via a connection piece (8) into the exhaust manifold or Exhaust port of the cylinder head (3) leads. 4. Engine ventilation or crankcase ventilation according to claims 1 to 3, characterized in that the hose line leading the crankcase gases via branch lines to two or more immediately behind an outlet] ate valve lying empty spaces in the exhaust manifold leads. 5. engine through crankcase ventilation according to claim 1, characterized in that that the necessary lines are designed as channels in the cylinder head, in corresponding flutter valve inserts are arranged.