DE8710359U1 - Cooling device for injection valves for internal combustion engines - Google Patents

Description

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In a cooling device with a housing that carries the injection valves and in which a first channel is formed for the supply of combustion air to the cylinders of the engine, which forms the intake manifold of the engine, this object is achieved according to the invention in that a second channel is formed in the housing for the supply of cooling air to the part of the injection valves that lies outside the housing.

- 3 - Description

The innovation concerns a cooling device for injection valves in combustion engines.

As is well known, injection valves are used to supply atomized fuel into an intake duct, which supplies combustion air to the engine's cylinders. The injection valves are attached to the intake manifold housing and are mounted outside of it, with only the injection nozzle protruding into the interior of the air supply duct.

In order for the injectors to work properly, they must be cooled in an appropriate way. In some engines, the injectors have a space between them for cooling air to circulate, but this complicates the design and increases the size. In other engines, the injectors are cooled indirectly by the air circulating in the engine compartment, generally supplied by the cooling radiator. In these engines, the injectors are not cooled directly and depend on the proximity of the injectors to the radiator, so there is a risk that the injectors will overheat.

The innovation is based on the task of providing a cooling device for injection valves in combustion engines, which allows direct cooling of the injection valves with simple modifications and a limited installation space. ^fc

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Further features and advantages of the innovation emerge from the remaining protective measures and from the description of an all-purpose example shown in the drawing.

Show it:

Figure 1 is a partial front view of a cooling device according to

the innovation,

Figure ζ a cross section through the cooling device and Figure 3 a longitudinal section through the cooling device of Figure

1.

The figures show a cooling device 1 for injection valves

2 in an internal combustion engine with pistons. The cooling device 1 has a housing 3 which is formed in one piece and carries the injection valves 2. In the housing 3 a first channel 3a is formed through which combustion air is guided to the cylinders of the engine and which thus forms the intake manifold of the engine to which the cooling device 1 is attached. In the housing

3, a second channel 3b is also formed, through which cooling air is guided to the injection valves 2, in particular to the part 12 of the injection valves 2 which is located outside the housing 3.

The first channel 3a has a central chamber 4 which is connected via a nozzle 5 to an air source not shown, for example the manifold of an air filter or the outlet opening of a turbo compressor; in the case of supercharged engines. Four lines 6 extend from the chamber 4, which are arranged in pairs and each of which carries an injection valve 2 near its outlet opening 7 (Figure 2). The outlet openings 7 are connected to a cylinder of an internal combustion engine in a known manner and therefore not shown in detail.

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A seat 8 is formed on each line 6, into which the nozzle 11 of an injection valve 2 engages, while the main part 12 of the injection valve 2 remains outside the housing 3. The injection valve 2 is preferably arranged obliquely to the axis of the corresponding line 6, so that the atomized fuel is injected into the line 6 in the direction of air flow. Each pair of lines 6 is formed integrally with the housing 3 and has a flange 13 at the outlet openings 7, which serves for attachment to the cylinder head.

The second channel 3b has a second chamber 14 which is formed in the housing 3 adjacent to the first chamber 4, with the longitudinal axes of the two chambers running parallel to one another. The chamber 14 is delimited at the top by the outside of a part of a wall 15 which delimits the chamber 4 on one side and by a wall 16 which starts from the wall 15 and extends obliquely downwards. The chamber 14 is delimited at the bottom by a further wall 17 which also starts from the wall 15 and is connected to the wall 16. Part of the wall 17 is formed by upper sections of the outsides of the housing parts in which the lines 6 are formed.

In the part of the housing 3 that connects the walls 17 and 16, openings 18 are incorporated in pairs, the openings of which run parallel to the associated line 6 and which also form a number of outlets of the second channel 3b.

The discharge openings 18 of each pair are separated from one another by a wall part 21 of the wall 17. The chamber 17 also has a nozzle 22 on one side, via which it can be connected to a cooling air source (not shown), for example via a hose or another line. Cooling air can be discharged through each opening 18 to the corresponding main part 12 of the associated injection valve 2, which is supplied via the nozzle 22, wherein according to the illustration

in the figures this part 12 is located above the injection nozzle 2 in the vicinity of the respective opening 18.

The lines 6 lead the combustion air to the cylinders of the engine, the air being enriched with atomized fuel near the respective outlet opening 7 via the injection valves 2. The second channel 3b, which is formed in the housing 3, however, allows direct cooling of the part IZ of the injection valves 2, since this is surrounded by the cooling air which can be supplied, for example, from the cooling radiator of the vehicle, which leads the air under pressure to the parts 12 via a fan wheel. In addition to cooling the injection valves 2, the air via the chamber 14 also cools the combustion air which flows through the first channel 3a to the cylinders.

I The above statements clearly show the advantages of cooling - I facility according to the innovation. In particular, with simple I chen, constructive adjustments in the same housing in which the

i Intake and injection take place, a channel for cooling air

I, which is equipped with simple and easily accessible

ij means cooling air is supplied. This channel 3b leads this

I Cooling air to the injection valves 2, which allows them to be

i Be effectively cooled, even if they are in a

I are located in a difficult to access area of the engine compartment.

1 The direct cooling of the injection valves 2 allows a better

* safer operation and allows them to be optimized according to their

I len operating position and not depending on the proximity to the

« Radiator, which also allows for better use of space

" Due to the design and arrangement of the channel for the cooling air, the intake combustion air for the cylinders is also cooled at the same time, which has a beneficial effect on the combustion efficiency, especially in turbocharged engines. The cooling air flows around the walls common to both channels.

Claims (6)

. ·■·■■-·- PATENT ATTORNEY j DIPL.-ING. GERHARD GUSTORF _{Office phone: 0871/89371} ! EUROPEANPATENTATTORNEY Private: 0871/25719 G1 953 FIAT AUTO S.p.A. Corso Giovanni Agnelli 200 Turin (Italy) Cooling device for injection valves in combustion engines S ection claims 1. Cooling device for injection valves in internal combustion engines with a housing which carries the injection valves and which has a first channel for supplying air to the cylinders of the engine, which first channel forms the intake manifold, characterized in that the housing (3) has a second channel (3b) for supplying cooling air to the part (12) of the injection valves (2) which are arranged outside the housing (3). 2. Cooling device according to claim 1, characterized in that the housing (3) is formed in one piece. 3. Cooling device according to claim 1 or 2, characterized in that the second channel (3b) has a first chamber (14) which has at least one nozzle (22) for connection to a cooling air source and a cooling air discharge opening (18) for each injection valve (2). - 2 4. Cooling device according to claim 3, characterized in that the first channel (3a), which has a second chamber (4) with at least one nozzle (5) for connection to a combustion air source for the engine, has an outlet line (6) for each injection valve (2), that the injection valves (2) are attached via their injection nozzles (11) for the fuel near the outlet opening (7) of the associated line (6), that the longitudinal axis of the first chamber (14) runs essentially parallel to the axis of the second chamber (4) and that the axis of the discharge openings (18) of the first chamber (14) runs essentially parallel to the axis of the lines (6). 5. Cooling device according to claim 4, characterized in that a part of the first chamber (14) is delimited by a wall (15) which separates it from the second chamber (4). 6. Cooling device according to claim 4 or 5, characterized in that four lines (6) are provided, which are arranged in pairs and each of which is formed in a one-piece housing, and that four discharge openings (18) of the first chamber (14) are also provided, which are arranged in pairs, each pair being arranged in an area above the corresponding pair of lines (6). fill XII
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