DE10039425A1 - Filter device for a high pressure area of a storage injection system for an internal combustion engine - Google Patents

Abstract

The invention relates to a storage injection system for high pressure fuel injection for internal combustion engines. A filter device (1) or (10) or (14) is located in a high pressure area of the injection system for separating impurities out of said high pressure area. Said filter device is configured e.g. in the form of a terminal closure (1) for a common high pressure line (5) such as e.g. a rail and is completely or partially produced from a magnetic material; or a filter (14) is located in the common high pressure line.

Description

The present invention relates to a filter device for a high pressure area of a storage injection system for egg internal combustion engine.

Accumulator injection systems for fuel injection e.g. B. High pressure injection systems for gasoline engines or common rail systems for diesel engines are due to their narrow component tolerances and the large forces acting on the components act, particularly susceptible to dirt. Operation of memory injection systems with dirty fuel can too lead to increased wear on the pump and the injector that damage occurs to these parts. Next ver deteriorates due to the increased wear of the components engine power and exhaust emissions. Furthermore can it happens that the injector nozzles by z. B. chips on or Dental closures are prevented, resulting in poor engine running to a standstill or to an engine break that can lead.

To the components of the memory injection systems before Verunreini protect from the fuel supplied therefore in the inlet of the low pressure area to the accumulator injection system Filters with very high degrees of separation switched on puts. These fuel filters can cause pollution conditions of the fuel, which be by its production things or come from the tank of the vehicle, filtered , however, the residues from the manufacture of the Pump, rail, lines, sensors and injek gates in the high pressure area are not filtered. more it is possible that the high pressure pump and others components in the high pressure area metallic particles, z. B. due to abrasion. But you can use  not the normal fuel filter in the low pressure range be filtered out, since they are only added to the filter switched area arise.

It is therefore an object of the present invention to save to provide injection system for an internal combustion engine len, which is also capable of contamination in the high to remove the pressure area of the accumulator injection system.

This task is performed by a memory injection system with the Features of claim 1 solved. Advantageous Next education is the subject of the subclaims.

According to the invention, a storage injection system for an internal combustion engine for injecting fuel under High pressure provided at a high pressure area of the accumulator injection system a filter device for Ab separate from impurities from the high pressure area is arranged. According to the invention is under the high pressure area of the memory injection system understood the area which compared to the inflow from the tank to a higher pressure has. The pump device of the store will also be spray system to the high pressure area of the system. According to the invention, any existing ones also belong the actual high pressure pump switched pumps or pre switched intermediate pressure areas to the high pressure area of the Accumulator injection.

For particularly good protection of the high pressure pump against Be to get damage, the filter device is preferred arranged in the high pressure pump. To especially the Injectors of the storage injection system in front of particles protect, the filter device is preferably in Rich device of the discharge line of the high pressure pump arranged.  

A particularly reliable filtering in the high pressure range of the memory injection system are preferred arranged several filter devices.

According to a preferred embodiment of the present invention The filter device is formed as a magnetic element educated. A filter device designed in this way can be easily featured in the high pressure pump or in lines will see.

The one designed as a magnetic element is advantageous Filter device by means of a press fit or by means of an egg nes thread attached. In this way the filter can be direction can be easily attached. It is also further possible, inexpensive retrofits from already in the Used fuel injection systems with one fil To enable equipment in the high pressure area.

According to a particularly preferred embodiment of the present The present invention is designed as a magnetic element te filter device as an end closure for a common High pressure line such as B. formed a rail. This can the previously used end closure simply by a mag netic end closure are replaced, so that no additional work such as providing an additional hole for the magnetic element, e.g. B. in the pump or Lei are necessary.

If the magnetic element simultaneously seals function, the magnetic element is ahead moves as a cone or as a ball. However, it is possible Lich, the magnetic element with a different geometry embody.

The end closure is preferably the common high pressure Line, which acts as a filter device, only partially se magnetically trained.  

According to a further preferred embodiment of the present the invention is in the end closure of the common high pressure line a magnet is used. This enables stan dardized magnets, which are inexpensive to manufacture or can be purchased as a supplier, who uses that can.

According to another advantageous embodiment of the present The present invention is the filter device as a filter with egg nem permeable filter material. Here will as a filter material for the filter, preferably a material used with a high degree of separation. Can be used as filter material all filter materials commonly used for fuel be used.

The filter is preferably at a common high pressure line of injectors such. B. a rail in diesel engines arranged. As a result, the filter device is special ders convenient location in the memory injection system because the volume of the common high pressure line can be used can to accommodate the filter device. Further there is by also ensuring that filtering is immediate in front of the injectors, which are the most sensitive Are components of the system. The filter can be in the common high pressure line that the High pressure line through the filter divided into two rooms is, with a room with the inflow to the high pressure line in Connection is established and the other room with the injector line connections. So who can be prevented that in the high pressure area of the storage injection system contained particles and particles to the injector nozzles gene.

According to a preferred embodiment of the invention Filters designed as flat filters. This enables a fold and inexpensive manufacture of the filter. Can continue  a filter designed as a flat filter is simply installed become.

To ensure a secure seal between the filter and a wall The filter shows how to enable the high-pressure system a peripheral seal in its edge area.

According to a further preferred embodiment of the present According to the invention, the filter is designed as a filter cartridge. This also allows the filter cartridge to be in the common High pressure line of the system can be arranged.

To divide the common high-pressure line into two Reaching rooms are on the outer circumference of the filter cartridge preferably at least two seals in the longitudinal direction see. It is thus achieved again that a room with the zu flow and the other room connected to the injector line and the filter cartridge is arranged between the two rooms is not.

According to another advantageous embodiment of the present Invention leads to a common high pressure inlet line into an interior of the filter cartridge.

The accumulator injection system is preferred as a common rail system trained for a diesel engine.

According to the invention it is thus achieved that in the very ho hen pressured operated high pressure area of a store spray systems such. B. a common rail system a parting that of impurities, especially of metallic latex NEN, is possible, which has not been possible in the prior art was. This places on the heavily edited and invented intensive field of high pressure injection systems ne significant improvement, which especially the Le Life of such systems increased significantly. It is also therefore desirable, especially since diesel engines in general  NEN have a relatively long life and therefore also the associated common rail system has a long service life should point.

The invention is based on preferred embodiments Rungsbeispiele described in connection with the drawing. In the drawing is:

Figure 1 is a partially sectioned view of a rail with a filter device according to a first embodiment of the present invention.

Fig. 2 is a schematic sectional view of a Filterein direction according to a second embodiment of the present invention;

Fig. 3 is a schematic, partially sectioned view of a rail with a filter device according to a third embodiment of the present inven tion;

Fig. 4 is a sectional view of the filter device of the third embodiment along the line CC in Fig. 3;

Fig. 5 is a schematic, partially sectioned view of a rail with a filter device according to a fourth embodiment of the present inven tion; and

Fig. 6 is a sectional view of the filter device of the four-th embodiment taken along line DD in Fig. 5.

In Fig. 1, a filter device according to a first exemplary embodiment from the present invention is shown. The memory injection system is a common rail system for a diesel engine.

The filter device of the first embodiment is formed as an end closure 1 of a rail, ie a common high pressure line (storage line) of the injection valves. As shown in Fig. 1, the end closure 1 comprises a threaded first portion 2 and a tapered portion 4, and a rich between the Gewindebe 2 and the tapered section 4 arranged Zvi rule region 3. The intermediate region 3 is formed out cylindrically. Furthermore, the end closure 1 according to the first exemplary embodiment is completely magnetic, ie is designed as a permanent magnet. It should be noted that the end closure can also consist of two parts, namely a screw (corresponds to the threaded area 2 ) and a sealing piece (corresponds to the intermediate area 3 and the tapered area 4 ).

As shown in Fig. 1, the end closure 1 is arranged in a ge stepped bore 8 in the rail 5 . The stepped bore 8 is arranged at the end of the rail 5 . The bore 8 has a tapered area which corresponds to the tapered area 4 of the end closure 1 in order to enable a sufficient sealing of a rail bore 6 of the rails 5 . For further sealing, a sealing ring can also be provided on the cylindrical intermediate region 3 of the end closure 1 (not shown).

As shown in FIG. 1, the end closure 1 is arranged in the rail 5 at the end of the rail bore 6 . A branch 7 branches off from the rail bore 6 and leads to an injection device (injector) in the direction of arrow B. At the rail bore 6 , several such branches are provided to the respective injection devices. The fuel comes from the high-pressure pump from the direction of arrow A. Thus, the end closure 1 , as shown in FIG. 1, is arranged on a blind hole region of the rail bore 6 , so that there is a space for receiving chips which are caused by the magnetic end closure 1 be filtered out, is present. In other words, the chips from the high-pressure area in the rail bore 6 can collect at the end closure 1 without the flow in the rail bore 6 being impaired thereby.

Thus, by means of the filter device formed as a magnetic sealing body 1 , residues from the high-pressure region of a common rail system can be reliably filtered out. It should be noted that although non-metallic impurities cannot be filtered out with such a magnetic filter. However, such particles in the fuel are usually filtered out in the low pressure range by the fuel filter there. In the high-pressure area, only metallic chips from residues generally occur during the manufacturing process or due to abrasion during operation, so that a magnetic filter device offers sufficient filter properties for the high-pressure area of the common rail system.

In FIG. 2, a filter device is shown according to a second embodiment of the present invention. The same parts are denoted by the same reference numerals as in the first embodiment.

As in the first embodiment, the filter device of the second embodiment is also designed as an end closure 1 for a rail (not shown). As in the first exemplary embodiment, the end closure 1 has a threaded region 2 , a cylindrical intermediate region 3 and a tapering region 4 .

In contrast to the first exemplary embodiment, however, the end closure 1 of the second exemplary embodiment is not completely made of a magnetic material. Instead, a cylindrical bore 9 is formed on the end face of the tapering region 4 , in which a cylindrical permanent magnet 10 is arranged. The cylindri cal permanent magnet 10 can be connected to the end closure 1 , for example, by gluing or by means of a press fit.

Thus, as in the first embodiment, a magnetic region of the end closure 1 is arranged in the rail bore of the rail, even in the second embodiment. As a result, existing chips accumulate on the magnet 10 in the high-pressure area of the common rail system.

In FIGS. 3 and 4 of the invention is a filter device shown according to a third embodiment. Parts are identified with the same reference numerals as in the previously described exemplary embodiments.

As shown in FIG. 3, a filter device designed as a filter 14 is arranged in a rail 5 . The filter 14 is made of a partially permeable filter material and has a circumferential seal 15 and 16 on its outer circumference (cf. FIG. 3). The filter 14 has a rectangular shape and is formed as a flat filter (mat).

As shown in FIG. 4, the filter 14 is arranged in the rail 5 such that the rail 5 is divided into a first space 12 and a second space 13 . The first space 12 is connected to an inlet 11 from the high-pressure pump (not shown) and the second space 13 is connected to a plurality of branches 7 , each of which leads to an injector. The seal 15 and 16 ensures that no passage of fuel from the first space 12 to the second space 13 is possible at the edge of the filter 14 .

Thus, the fuel coming from the inlet is filtered by the filter ter 14 , with any particles contained in the fuel such as. B. production-related metal chips or chips generated due to abrasion. Since the filter 14 is arranged in the rail 5 and uses the volume of the rail for receiving, it is not necessary to provide a separate installation space for the filter. This means that the high-pressure area of the common rail system can be filtered without design changes in the system.

In FIGS. 5 and 6, a filter device is shown according to a fourth embodiment of the invention. Parts are identified with the same reference numerals as in the previously described exemplary embodiments.

As shown in Fig. 5, the filter device 14 of the fourth embodiment is also arranged in a rail 5 . The filter 14 is designed as a filter cartridge with a hollow cylindrical shape.

As shown in Fig. 6, the filter cartridge 14 is held by four seals 15 , which are arranged in the longitudinal direction on the outer circumference of the Fil terpatrone 14 , spaced from the inner edge region of the rail 5 . It should be noted that the number of longitudinal seals 15 z. B. depends on the location of the connections 11 and 7 . The longitudinal seals 15 prevent fuel on the outer circumference of the filter cartridge 14 from the inlet 11 from flowing unfiltered to the connections 7 . The two open ends of the filter cartridge 14 are also sealed off from the rail 5 by means of two end seals 16 (cf. FIG. 5).

If now fuel is fed via the inlet 11 into the rail 5 , it is passed through the filter cartridge 14 , any particles present on the outer circumference of the filter cartridge 14 being separated. The fuel cleaned in this way is then fed to the injectors.

In summary, the present invention relates to a memory injection system for fuel injection under high pressure for internal combustion engines, a filter device 1 or 10 or 14 for separating contaminants from the high pressure region being arranged in a high pressure region of the injection system. The filter device is for example as an end closure 1 for a common high pressure line 5 such. B. formed a rail and made entirely of a magnetic material or a permanent magnet is embedded in the end closure or a Fil ter 14 is arranged in the common high pressure line.

The preceding description of the exemplary embodiments according to the present invention is for illustrative purposes only and not for the purpose of limiting the invention. In the frame Various changes and modifications are made to the invention tion possible without the scope of the invention and its Leaving equivalents.

Claims (19)

1. Accumulator injection system for an internal combustion engine for injecting fuel under high pressure, characterized in that a filter device ( 1 ; 10 ; 14 ) for separating contaminants from the high pressure area is arranged in a high pressure area of the memory. 2. Accumulator injection system according to claim 1, characterized in that the filter device ( 1 ; 10 ; 14 ) is arranged in a high pressure pump or an outlet ( 6 ) of the high pressure pump or a common high pressure line ( 5 ). 3. Accumulator injection system according to claim 1 or 2, characterized in that a plurality of filter devices ( 1 ; 10 ; 14 ) are arranged in the high pressure region of the accumulator injection system. 4. Accumulator injection system according to one of claims 1 to 3, characterized in that the filter device is designed as a magnetic element ( 1 ; 10 ). 5. Accumulator injection system according to claim 4, characterized in that the magnetic element ( 1 ; 10 ) is attached by means of an interference fit or by means of a thread. 6. Accumulator injection system according to one of claims 4 or 5, characterized in that the magnetic element is designed as an end closure ( 1 ) for the common high pressure line ( 5 ). 7. Accumulator injection system according to one of claims 4 to 6, characterized in that the magnetic Ele ment is designed as a cone or as a ball.   8. Storage injection system according to claim 6 or 7, characterized in that the end closure ( 1 ) is completely magnetic. 9. memory injection system according to claim 6 or 7, characterized in that the end closure ( 1 ) is only partially magnetic. 10. The storage injection system according to claim 9, characterized in that a permanent magnet is inserted in the end closure ( 1 ). 11. Accumulator injection system according to one of claims 6 to 10, characterized in that the end closure ( 1 ) is designed with a tapering region ( 4 ) for sealing the common high-pressure line ( 5 ). 12. Accumulator injection system according to one of claims 1 to 3, characterized in that the filter device is designed as a filter ( 14 ) with a partially permeable filter material. 13. The storage injection system according to claim 12, characterized in that the filter ( 14 ) is arranged in the common high-pressure line ( 5 ) and the common high-pressure line ( 5 ) is divided into at least a first space ( 12 ) and a second space ( 13 ) , wherein the first space ( 12 ) is connected to an inflow ( 11 ) to the common high-pressure line ( 5 ) and the second space ( 13 ) is connected to a branch ( 7 ) from the common high-pressure line ( 5 ). 14. Storage injection system according to one of claims 12 or 13, characterized in that the filter ( 14 ) is designed as a flat filter. 15. Accumulator injection system according to one of claims 12 to 14, characterized in that the filter ( 14 ) has a circumferential seal ( 15 , 16 ) on its edge region. 16. The memory injection system according to claim 12 or 13, characterized in that the filter ( 14 ) is designed as a fil ter cartridge. 17. The memory injection system according to claim 16, characterized in that at least two seals ( 15 ) are provided in the longitudinal direction on the outer circumference of the filter cartridge. 18. Accumulator injection system according to claim 16 or 17, characterized in that an inlet ( 11 ) to the common high-pressure line ( 5 ) opens into the inner region of the filter cartridge. 19. Accumulator injection system according to one of the preceding An Sayings characterized in that the Spei injection system as a common rail system for diesel engines is trained.