WO2014206670A1

WO2014206670A1 - Fuel metering unit for a high-pressure injection system

Info

Publication number: WO2014206670A1
Application number: PCT/EP2014/060884
Authority: WO
Inventors: Achim Meisiek; Stefan Kolb; Tobias Landenberger; Hans Heber
Original assignee: Robert Bosch Gmbh
Priority date: 2013-06-25
Filing date: 2014-05-27
Publication date: 2014-12-31
Also published as: CN105814304A; DE102013212121A1

Abstract

The invention relates to a valve (14), in particular a fuel-metering unit (15), comprising a valve cylinder (16), a valve piston (17) which is movable within the valve cylinder (16) between a closed position and open position such that in the closed position the valve (14) is closed and in the open position the valve (14) is open, a resilient valve element (37), in particular a valve spring (38), which is connected to the valve piston (17) and by means of which valve spring a force can be applied to the valve piston (17) in the opposite direction to a force which can be applied by an electromagnet (40) to the valve piston (17), such that the valve piston (17) can be moved between the closed position and the open position by means of the force applied by the resilient valve element (37) and the electromagnet (40) to the valve piston (17), the electromagnet (40) with a coil (41) for moving the valve piston (17), a movable armature (42), which is mechanically operatively connected to the valve piston (17), for moving the valve piston (17), a plastic housing (18) which is constructed radially outside the coil (41), wherein the plastic housing (18) is additionally constructed radially inside the coil (41).

Description

description

title

Fuel metering unit for a Hochdruckeinspritzsvstem

The present invention relates to a valve according to the preamble of

Claim 1 and a high-pressure injection system according to the preamble of claim 14th

State of the art

In high-pressure injection systems for internal combustion engines, especially in common-rail injection systems of diesel or gasoline engines, a high-pressure pump permanently ensures the maintenance of the pressure in the

High pressure accumulator of the common rail injection system. The high-pressure pump can be driven, for example, by a camshaft of the internal combustion engine by means of a drive shaft. For the promotion of the fuel to the high-pressure pump Vorförderpumpen, z. B. a gear or

Rotary vane pump, used, which are upstream of the high-pressure pump. The prefeed pump delivers the fuel from a fuel tank through a fuel line to the high pressure pump.

Amongst others, piston pumps are used as high-pressure pumps. In a housing, a drive shaft is mounted. Radially to pistons are arranged in a cylinder. On the drive shaft with at least one cam is a roller with a roller rolling surface, which is mounted in a roller shoe. The roller shoe is connected to the piston, so that the piston is forced to oscillate translational motion. A spring applies to the roller shoe a radially directed to the drive shaft force, so that the roller is in constant contact with the drive shaft. The roller stands with the roller rolling surface on a shaft rolling surface as the surface of the drive shaft with the at least one cam in contact with the drive shaft. The roller is mounted by means of a sliding bearing in the roller shoe.

A fuel metering unit controls and / or regulates that of the

High-pressure pump delivered volume flow of fuel. Within a plastic housing, an electromagnet is arranged with a coil and an armature within the coil. An armature tappet is secured to the armature so that a valve piston within a valve cylinder can be moved between a closed position and an open position with the armature tappet and a valve spring. A steel housing serves to guide the magnetic flux of the electromagnet. The anchor is mounted with two separate bearings. In addition, in a fictional cut is perpendicular to one

Longitudinal axis of the armature, in which the notional section intersects both the coil and the armature, the fuel metering unit in a first fictitious part without the valve cylinder and in a second fictitious part with the

Valve cylinder is divided and on the first fictitious part, a seal for sealing the coil with respect to the fuel is formed. Due to this seal and the required two separate bearings is the

Fuel metering unit in production consuming and expensive.

DE 10 2009 026 596 A1 shows a high-pressure pump for conveying a fluid, in particular fuel, comprising a drive shaft, at least one piston, at least one cylinder for supporting the piston, wherein the at least one piston is supported indirectly or directly on the at least one cam, so that of the at least one piston one

Translational movement is executable due to a rotational movement of the drive shaft.

From DE 10 201 1 003 172 A1 a fuel metering unit for a fuel injection system of an internal combustion engine is known. A

High pressure pump is connected to the fuel metering unit, wherein the metering unit comprises a solenoid operated by a control valve and the control valve against the force of a compression spring of a

Anchor bolt of the electromagnet adjustable valve piston for controlling a control port has. Disclosure of the invention

Advantages of the invention Inventive valve, in particular fuel metering unit, comprising a valve cylinder, one within the valve cylinder between a

Closed position and open position movable valve piston, so that in the closed position the valve is closed and in the open position the valve is open, connected to the valve piston elastic valve element, in particular valve spring, with which on the valve piston a force, in particular compressive force, can be applied, the opposite to a force applied by an electromagnet on the valve piston, so that the valve piston by means of the elastic valve element and the

Electromagnet on the valve piston applied force, in particular pressure force, between the closed position of the open position is movable, the

Electromagnet with a coil for moving the valve piston, a movable armature, which is in mechanical operative connection with the

Valve piston is, for moving the valve piston, a plastic housing, which is formed radially outside the coil, wherein the plastic housing is additionally formed radially inside the coil. Due to the formation of the plastic housing also radially within the coil and the movable armature of the electromagnet can be stored on the plastic housing and the coil does not come into contact with the fluid, in particular fuel.

In a further embodiment, the plastic housing comprises an outer part formed radially outside the coil and an inner part formed radially inside the coil, and the inner part and outer part are integrally formed, in particular the inner part is arranged radially between the armature and the coil. The outer part and the inner part can thus be made in a particularly simple and inexpensive one piece in an injection molding of thermoplastic material during injection molding.

In an additional embodiment, the armature, in particular directly, is mounted on the inner part of the plastic housing. In a further embodiment, on a radial inner side of the inner part of a bearing layer, for. B. a bearing film, in particular a PTFE film, attached to the storage of the armature on the inner part of the plastic housing. Suitably, the, preferably thin, bearing layer as part of the

Viewed plastic housing, so that the anchor is mounted with the bearing layer directly to the plastic housing, d. H. is arranged radially between the plastic housing with bearing layer and the anchor no other component. In particular, the bearing layer is used only for supporting the armature made of metal on the plastic housing made of plastic, because a contact or a support of the armature made of metal on the plastic housing usually does not have sufficient reliability and longevity.

In a supplementary variant, the armature is mounted exclusively on the inner part of the plastic housing. Advantageously, so that no separate storage for the anchor is required because the plastic housing in addition to the housing function also takes over the storage function for the anchor.

In a further variant, the valve comprises a metal sleeve, which

is preferably arranged radially outside the coil, for guiding the magnetic flux of the electromagnet.

In a further embodiment, the valve comprises a, preferably annular, metal disc, which is preferably arranged axially outside the coil, for conducting the magnetic flux of the electromagnet.

In a supplementary embodiment, the coil and / or the metal sleeve and / or the metal disc are at least partially, in particular completely, enclosed by the plastic housing. When fully enclosing the coil and / or the metal sleeve and / or the metal disc, these are

Components with respect to the fluid sealed and also no, even with a partial Umschießen, fastening means for these components is required, so that the plastic housing and the function of a

Fastener for these components takes over. In an additional embodiment, only the inner part of the plastic housing and preferably the bearing layer are arranged on the inner part between the coil and the armature in the radial direction.

In another variant valve comprises a valve cylinder with a piston bore and in the piston bore, the valve piston is movably mounted between the open position and the closed position and / or anchor anchor is attached to the armature plunger and the armature plunger rests on the valve piston and / or the valve piston is disposed coaxially with the armature and / or the armature is disposed radially inside the coil and / or within a magnet sleeve.

In an additional embodiment, the valve comprises an inlet opening for the fluid and an outlet opening for the fluid and the inlet opening and outlet opening are formed on the valve cylinder.

In a further embodiment, the valve is divided into a first fictitious part without the valve cylinder and a second fictitious part with the valve cylinder in a fictional section perpendicular to a longitudinal axis of the armature, in which the notional section intersects both the coil and the armature and on the first fictitious part is no separate seal, in particular no elastic ring seal, for sealing the coil with respect to the fluid, in particular fuel, and preferably formed on the second fictitious part, a seal between the plastic housing and the

Valve cylinder is formed. Advantageously, therefore, no separate seal is required on the fictitious first part, because in particular the coil is completely enclosed by the plastic housing and thus sealed with respect to the fluid, so that no fluid can reach the coil.

It is expedient for the plastic housing, in particular in one piece, a

Flange ring formed for attachment of the valve and / or the entire plastic housing is integrally formed, in particular by means of injection molding of thermoplastic material. The plastic housing with the functions for attaching the valve can thus be produced inexpensively and reliably. In a further embodiment, the valve is at least partially, in particular completely, made of metal, for. As steel or aluminum, and / or plastic. Metal is a particularly durable and durable material for the manufacture of the valve. Plastic advantageously has a low weight, so that thereby the valve has a low weight. Preferably, the plastic is a glass fiber reinforced and / or thermoplastic material. Preferably consist of

Valve cylinder and / or the plastic housing and / or the valve piston at least partially, in particular completely, made of plastic.

In a further variant, an axial direction is aligned parallel to the longitudinal axis and movement axis of the armature.

Preferably, a radial direction is aligned perpendicular to the longitudinal axis and axis of movement of the armature.

Inventive high-pressure injection system for an internal combustion engine, in particular for a motor vehicle, comprising a high-pressure pump, a fuel metering unit, a prefeed pump, a high-pressure rail, wherein the fuel metering unit is designed as a fuel metering unit described in this patent application.

In a further variant, the valve cylinder of the fuel metering unit is arranged at least partially within a housing of the high-pressure pump.

In a supplementary variant, the volume flow of the of

Pre-feed pump to the high-pressure pump pumped fuel controlled during operation of the internal combustion engine and / or controlled by using the metering unit, the flow cross-sectional area of a flow channel from the feed pump to the high-pressure pump is controlled and / or regulated.

The producible by the high-pressure pump pressure in the high-pressure rail is, for example, in the range of 1000 to 3000 bar z. B. for diesel engines or between 40 bar and 400 bar z. B. for gasoline engines. Brief description of the drawings

Hereinafter, an embodiment of the invention below

With reference to the accompanying drawings described in more detail. It shows:

1 shows a cross section of a high-pressure pump for conveying a fluid,

2 shows a section A-A of FIG. 1 a roller with roller shoe and a drive shaft,

Fig. 3 is a highly schematic view of a high-pressure injection system and

Fig. 4 is a longitudinal section of a Kraftstoffzumesseinheit for

the high-pressure injection system.

Embodiments of the invention

In Fig. 1 is a cross section of a high-pressure pump 1 for conveying fuel is shown. The high-pressure pump 1 serves to fuel, z. As gasoline or diesel, to promote an internal combustion engine 39 under high pressure. The pressure which can be generated by the high-pressure pump 1 is, for example, in a range between 1000 and 3000 bar.

The high-pressure pump 1 has a drive shaft 2 with two cams 3, which performs a rotational movement about a rotation axis 26. The axis of rotation 26 lies in the plane of the drawing of FIG. 1 and is perpendicular to the

Drawing plane of Fig. 2. A piston 5 is mounted in a cylinder 6, which is formed by a housing 8. A working chamber 29 is bounded by the cylinder 6, the housing 8 and the piston 5. Into the working space 29 opens an inlet channel 22 with an inlet valve 19 and an outlet channel 24 with an outlet valve 20. Through the inlet channel 22, the fuel flows into the

Working space 29 and through the outlet channel 24, the fuel flows out of the working space 29 under high pressure again. The inlet valve 19, z. As a check valve, is designed to the effect that only fuel can flow into the working space 29 and the exhaust valve 20, z. B. a Check valve is designed so that only fuel can flow out of the working chamber 29. The volume of the working chamber 29 is changed due to an oscillating stroke movement of the piston 5. The piston 5 is indirectly supported on the drive shaft 2 from. At the end of the piston 5 or pump piston 5, a roller shoe 9 is attached to a roller 10. The

Roller 10 is mounted with a sliding bearing 13 on the roller shoe 9 and can perform a rotational movement, the axis of rotation 25 lies in the plane of FIG. 1 and is perpendicular to the plane of Fig. 2. The drive shaft 2 with the at least one cam 3 has a shaft rolling surface 4 and the roller 10 has a roller rolling surface 1 1.

The roller tread 1 1 of the roller 10 rolls on a contact surface 12 on the shaft rolling surface 4 of the drive shaft 2 with the two cams 3 from. The roller shoe 9 is mounted in a roller shoe bearing formed by the housing 8 as a sliding bearing. A pump spring 27 or pump compression coil spring 27 as an elastic pump element 28, which is clamped between the housing 8 and the roller shoe 9, applies to the roller shoe 9 a compressive force, so that the roller rolling surface 1 1 of the roller 10 in constant contact with the waves Rolling surface 4 of the drive shaft 2 is. The roller shoe 9 and the piston 5 thus carry out together an oscillating stroke movement. The roller 10 is mounted with a sliding bearing 13 in the roller shoe 9.

In Fig. 3 is a highly schematic representation of a high-pressure injection system 36 for a motor vehicle (not shown) imaged with a high-pressure rail 30 or a fuel rail 31. From the high-pressure rail 30 and a

Fuel rail 31, the fuel is injected by means of valves (not shown) in the combustion chambers (not shown) of the internal combustion engine 39. An electric prefeed pump 35 delivers fuel from a fuel tank 32 through a fuel line 33 to the high pressure pump 1. The high-pressure pump 1 is driven by the drive shaft 2 and the

Drive shaft 2 is a shaft, z. B. a crankshaft or camshaft, the

Internal combustion engine 39. A fuel metering unit 15 controls and / or regulates the per unit time to the high-pressure pump 1 conducted volume of fuel. The high-pressure rail 30 serves to inject the fuel into the combustion chamber of the internal combustion engine 39. That of the high-pressure pump 1 is not required fuel is returned through an optional fuel return line 34 back into the fuel tank 32.

In Fig. 4, the fuel metering unit 15 is shown as a valve 14 in a longitudinal section. A plastic housing 18 is made of thermoplastic material

Injection molding made. A coil 41 as an electromagnet 40 and an annular metal disc 49 made of steel is completely enclosed by the plastic housing 18. A metal sleeve 48 made of steel is of the

Plastic housing 18 almost completely enclosed, only at one in Fig. 4 lower end portion of the metal sleeve 48 is not enclosed by the plastic housing 18. The annular metal disk 49 and the metal sleeve 48 made of steel serve to guide the magnetic flux generated by the electromagnet 40 so that an armature 42 in the direction of a longitudinal axis 58 of the

magnetic flux can be moved. The metal disk 49 has an opening for the passage of the armature 42. Radially outside the coil 41, the plastic housing 18 comprises an outer part 44 and within the coil 41, d. H. in the radial direction perpendicular to the longitudinal axis 58, between the coil 41 and the movable armature 42, an inner part 45. The outer and inner part 44,

45 are integrally formed as the entire plastic housing 18. On the radial inner side of the inner part 45 is a bearing foil 47 as a bearing layer

46 attached. The armature 42 made of steel is mounted exclusively on the bearing foil 47, so that no separate storage for the armature 42 is required. The inexpensive injection molded plastic housing 18 with the

Bearing 47 thus serves as a storage for the armature 42. The armature 42 is thus disposed within a housing opening of the plastic housing 18 and stored and the housing opening is coaxial with the longitudinal axis 58 of the armature 42 is formed. An armature tappet 43 is fixedly arranged on the armature 42 so that the armature tappet 43 carries out a movement of the armature 42 in the direction of the longitudinal axis 58. The armature 42 is disposed within a space enclosed by the coil 41.

A valve cylinder 16 has coaxially with the longitudinal axis 58, a piston bore 50 and within the piston bore 50, a valve piston 17 is mounted, so that the valve piston 17 can perform a translational movement in the direction of the longitudinal axis 58 as the armature 42. The valve piston 17 is cup-shaped an upper top wall and a downwardly open side wall. The downwardly open valve piston 17 thus limits the inside one

Valve piston cylinder space within which partially an elastic

Valve element 37 is arranged as a valve spring 38. The valve spring 38 rests on the top side on the top wall of the valve piston 17 and on the bottom side on a support ring 68 which at the lower end of the piston bore 50 at the

Valve cylinder 16 is attached. The valve spring 38 thus brings on the valve piston 17 a as shown in FIG. 4 upward pressure force. The valve cylinder 16 has at the radial outside outside the

Plastic housing 18 a completely circumferential annular groove 53 and on the annular groove 53, a sieve 69 is arranged. In the annular groove 53 and in the

Piston bore 50 open radial cylinder bores 54, so that fuel can flow from the annular groove 53 as an inlet opening 51 through the cylinder bores 54 into the piston bore 50 through the radial cylinder bores 54. The valve piston 17 has at the lower end of the side wall of the

Valve piston 17 radial piston bores 64, so that in an at least partially aligned the piston bores 64 on the valve piston 17 and the cylinder bores 54 on the valve cylinder 16, a fluid-conducting connection from the inlet opening 51 as the annular groove 53 to the downwardly open

Valve piston cylinder space exists and the fuel through the

Valve piston cylinder space can flow into the piston bore 50. Of the

Piston bore 50, the fuel can flow through an opening on the support ring 68, so that the opening on the support ring 68 forms a drain opening 52 of the fuel metering unit. 4, an open position of the fuel metering unit 15 is shown. Of the

Valve piston 17 is in the open position due to the pressure applied by the valve spring 38 to the valve piston 17. Of the

Armature plunger 43 is guided by a plunger bore 67 on the valve cylinder 16 to the valve piston 17, so that the bottom of the armature plunger 43 rests on the top of the top wall of the valve piston 17. When the coil 41 of the electromagnet 40 is energized, the magnetic flux generated by the coil 41 causes the armature 42 to move downwards so that the armature plunger 43 is also moved downward by the plunger bore 67 formed coaxially with the longitudinal axis 58 in the valve cylinder 16 and thus the

Valve piston 17 from the open position shown in Fig. 4 in a

Closed position (not shown) is moved. In the closed position, the alignment radial cylinder bores 54 in the valve cylinder 16 is no longer with the piston bores 64 in the valve piston 17, so that the radial

Cylinder bores 54 are fluid-tightly closed by the side wall of the valve piston 17 and thus no fuel can flow as a controlled and / or regulated fluid through the inlet opening 51 to the drain opening 52. In an interruption of the power line through the coil 41 is applied by the armature plunger 43 no downward pressure force on the valve piston 17 so that the valve piston 17 by means of the valve spring 38 on the valve piston 17 upward pressure force of the

Closed position is moved to the open position. The radial

Piston holes 64 on the valve piston 17 have a special

Control geometry, so that different positions of the

Valve piston 17 thereof are in a special dependency ratio standing different flow cross-sectional areas for the fluid available. The different positions of the valve piston 17 are achieved with a different energization of the coil 41, so that of the

Ankerstößel 43 a different pressure force on the top wall of the valve piston 17 can be applied. A notional section 55 perpendicular to the longitudinal axis 58 of the armature 42 and the

Valve piston 17 divides the valve 14 into an upper fictitious first part 56 and a lower fictitious second part 57. The notional section 55 intersects both the spool 40 and the armature 42. The armature 42 is radially inside the spool 40 and inside the metal sleeve 48 is arranged. The coil 40 is completely enclosed in a fluid-tight manner by the plastic housing 18, so that no seal 60, 62 is required on the fictitious upper first part 56 in order to avoid contact of the coil 40 with fuel. Although the fuel can get into the housing opening and the armature 42, but not to the coil 40. On the valve cylinder 16 is on the outside of the inside of the

Plastic housing 18 disposed portion of the plastic housing 18 has an annular first sealing groove 59 and in the first sealing groove 59, a first elastic ring seal 60 is arranged to seal the plastic housing 18 with respect to the outside of the valve cylinder 16. The outside of the plastic housing 18 arranged part of the valve cylinder 16 is disposed in an opening (not shown) of the housing 8 of the high-pressure pump 1.

To seal the housing 8, the valve cylinder 16 has a second annular sealing groove 61 on and in the sealing groove 61 is a second elastic ring seal 62. The ring seal 62 rests on the housing 8, so that between the housing 8 of the high pressure pump 1 and the valve cylinder 16 no fuel can flow out.

The plastic housing 18 also has a flange 63 with

Attachment openings 66. By means not shown screws in the mounting holes 66, the fuel metering unit 15 can be screwed to the housing 8 of the high-pressure pump 1. An electrical connector 65 with two contact elements is used for electrically connecting the coil 41 to a power source (not shown). The power lines from the plug 65 to the coil 41 are not shown, but completely within the

Plastic housing 18 is arranged so that no additional seal for the power lines is necessary to seal them with respect to the fuel.

Overall, significant benefits are associated with the valve 14 of the present invention. The armature 42 is supported exclusively on the plastic housing 18, so that no costly additional storage for the armature 42 is required, since the storage for the armature 42 is formed by the plastic housing 18. In the injection molding of the plastic housing 18, the coil 41 and the metal sleeve 48 and the metal plate 49 are encapsulated, so that these components need not be sealed separately with respect to the fuel and no installation effort for attaching these components is necessary. After the injection molding of the plastic housing 18, only the preassembled valve cylinder 16 with the valve piston 17 and the armature 42 with the armature plunger 43 is inserted into the plastic housing 18. Due to the attachment of the outside of the plastic housing 18 arranged part of the valve cylinder 16 within an outside recess on the housing 8 of the high-pressure pump 1, the armature 42 and the valve cylinder 16 between the plastic housing 18 of the valve 14 and the housing 8 of

High pressure pump 1 held positively.

Claims

claims

1 . Valve (14), in particular fuel metering unit (15) comprising

a valve cylinder (16),

- One within the valve cylinder (16) between a

Closed position and open position movable valve piston (17), so that in the closed position, the valve (14) is closed and in the open position, the valve (14) is open,

- an elastic valve element (37) connected to the valve piston (17), in particular valve spring (38), with which a force can be applied to the valve piston (17) which is opposite to that of an electromagnet (40) on the valve piston (17) Applicable force is, so that the valve piston (17) by means of the elastic valve element (37) and the electromagnet (40) on the valve piston (17) applied force between the closed position of the open position is movable

- The electromagnet (40) with a coil (41) for moving the valve piston (17),

- A movable armature (42), which in mechanical

Operative connection with the valve piston (17) is, for moving the valve piston (17),

- A plastic housing (18), which is formed radially outside the coil (41), characterized in that the plastic housing (18) is additionally formed radially inside the coil (41).

2. Valve according to claim 1, characterized in that the plastic housing (18) comprises an outer part (44) formed radially outside the coil (41) and an inner part (45) formed radially inside the coil (41), and the inner part (45) and outer part (44) are integrally formed, in particular the Inner part (45) is arranged radially between the armature (42) and the coil (41).

3. Valve according to claim 2, characterized in that the armature (42), in particular directly, on the inner part (45) of the plastic housing (18) is mounted.

4. Valve according to claim 3, characterized in that on a radial inner side of the inner part (45) has a bearing layer (46), for. B. a bearing film (47), in particular a PTFE film (47), is attached to the mounting of the armature (42) on the inner part (45) of the

Plastic housing (18).

5. Valve according to claim 3 or 4, characterized in that the armature (42) exclusively on the inner part (45) of the

Plastic housing (18) is stored.

6. Valve according to one or more of the preceding claims, characterized in that the valve (14) comprises a metal sleeve (48), which is preferably arranged radially outside of the coil (41), for conducting the magnetic Flow of the electromagnet (40).

7. Valve according to one or more of the preceding claims, characterized in that the valve (14) comprises a, preferably annular, metal disc (49), which is preferably arranged axially outside the coil (41) for guiding the magnetic flux of the electromagnet (40).

8. Valve according to one or more of the preceding claims, characterized in that the coil (41) and / or the metal sleeve (48) and / or the metal disc (49) at least partially, in particular completely, of the

Plastic housing (18) are enclosed.

9. Valve according to one or more of claims 2 to 8, characterized in that between the coil (41) and the armature (42) in the radial direction inner part (45) of the plastic housing (18) and preferably the bearing layer (46) on the Inner part (45) are arranged.

10. Valve according to one or more of the preceding claims, characterized in that the valve (14) comprises a valve cylinder (16) with a piston bore (50) and in the piston bore (50) of the valve piston (17) movable between the open position and the Closed position is stored and / or

An armature tappet (43) is fastened to the armature (42) and the armature tappet (43) rests on the valve piston (17) and or

the valve piston (17) is arranged coaxially with the armature (42) and / or

the armature (42) is arranged radially inside the coil (41).

1 1. Valve according to one or more of the preceding claims, characterized in that the valve (14) has an inlet opening (51) for the fluid and a

Includes drain opening (52) for the fluid and the inlet opening (51) and drain opening (52) on the valve cylinder (16) are formed.

12. Valve according to claim 10 or 1 1, characterized in that in a notional section (55) perpendicular to a longitudinal axis (58) of the armature (42), in which the notional section (55) both the coil (41) and the armature (42) intersects the valve (14) is divided into a first fictitious part (56) without the valve cylinder (16) and in a second fictitious part with the valve cylinder (16) and at the first notional part (56) no separate seal (60), in particular no elastic

Ring seal (60), for sealing the coil (41) with respect to the fluid, in particular fuel, is formed, and preferably at the second fictitious part (57) has a seal (60) between the

Plastic housing (18) and the valve cylinder (16) is formed.

13. Valve according to one or more of the preceding claims, characterized in that on the plastic housing (18), in particular in one piece, a flange

(63) is designed for fastening the valve (14)

and or

the entire plastic housing (18) in one piece, in particular by means of Injection molding of thermoplastic material, is formed.

14. High-pressure injection system (36) for an internal combustion engine (39), in particular for a motor vehicle, comprising

a high pressure pump (1),

a fuel metering unit,

a prefeed pump (35),

- A high pressure rail (30), characterized in that the fuel metering unit is formed according to one or more of the preceding claims.

15. High-pressure injection system according to claim 14, characterized in that the valve cylinder (16) of the fuel metering unit (15) at least partially within a housing (8) of the high pressure pump (1) is arranged.