DE102007013875B3 - Electrohydraulic valve, particularly automotive high pressure-regulating valve, for regulating pressure in common-rail-diesel fuel injection system, has hydraulic part and electrical part, where valve is enclosed by cover - Google Patents

Abstract

The electrohydraulic valve comprises a hydraulic part and an electrical part. The valve is enclosed by a cover on the electrical part with small mechanical strength. A separating plate (100) is arranged inside the valve under the cover, which separates a hydraulic high pressure area of the valve from a low-pressure area of the valve. The separating plate is a pressure compartment, which holds a hydraulic fluid from adjoined components.

Description

The The present invention relates to an electro-hydraulic valve, as an automotive valve, in particular as a fuel pressure control valve, can be used and especially good with high pressures and pressure fluctuations and pressure pulses can handle.

Battery powered Valves are used in many places, even in automobiles, so for example as transmission control valves, as engine control valves and as fuel control valves. Especially for the transmission controls and The fuel regulation is a trend that has been going on for years observe the hydraulic components designed for ever higher pressures. Depending on the gearbox type are pressures up to more than 50 bar now common, depending on the fuel injection system are pressures up to more than 2000 bar now known in the art.

From the EP 1 088 182 B1 (Patent owner: Hydraulik-Ring GmbH, filing date: 28.05.1999) is a pressure control valve with a flat armature, especially for use as a high-pressure diesel control valve, known. The disclosure of the present patent is incorporated by reference in its entirety into the present application with respect to the structural illustrations and with respect to the functional description of a valve with flat armature.

With rising pressures and the installation of additional Filtering in the common rail of the diesel injection system can cause unwanted pressure flashbacks and pressure breakdowns as well Pressure impulses on the armature and the plunger passing through it Pressure control valve occur. In the previously known constructions an operational Pressure control valve there were states where the lid of the valve could no longer withstand the blows.

Especially The long-term aging caused by the permanent blows could lead to premature fragility lead the lid.

A first constructive solution to the problem may be the patent application still unpublished at the time of filing of the present application DE 10 2007 001 785.7 (Applicant: Hydraulik-Ring GmbH, filing date: 05.01.2007). There it is proposed to intercept the strokes of the flat anchor by a stop strip in the outer region, ie at the edge of the anchor.

Laboratory investigations in the DE 10 2007 001 785.7 proposed solution have shown that the hydraulic fluid, such as the diesel fuel, the bilaterally flushed anchor can also exert tensile forces on the lid.

ever to constructive design of the armature of a high pressure control valve and the space of movement of the armature may therefore be desirable Customers of pressure control valves another solution, especially in use under medium (several 10 bar pressure) and high pressures (several hundred up to 2000 bar).

From the AT 322 457 B (Patent owner: Hansa Metallwerke AG, filing date: 28.10.1971) is known to perform the piston stop bottom twice. Two interlocking caps are inserted into each other. An automotive valve is constructed significantly more compact, so that the valve structure graphically reproduced in the patent can not be installed in the length dimensions of an installation space kept free for a valve in the motor vehicle.

From the publication DE 24 27 201 A1 (Applicant: H. Kunke GmbH KG, filing date: 05.06.1974), the idea is known to design the housing with a central indentation to lead the electromagnetic field lines through the housing particularly favorable. This can be sheet metal parts such. As a housing, deep-drawn special recesses in some places.

The inventive task is achieved by a valve according to claim 1.

advantageous Embodiments are the dependent claims refer to.

Electrohydraulic valves are usually electrically controlled via two externally accessible contacts, often from a vehicle control unit. Depending on the energization of the bobbin whose central component is the coil wound on a bobbin, a magnetic flux builds up over an armature in a known manner. The armature or other valve parts connected to it, such as, for example, the plunger or the piston, can be biased by a spring into a preferred position. There are anchors that are operated dry, that is uncoupled and separated from the hydraulic part, and there are anchors that are partially or completely lapped by the hydraulic fluid. In high-pressure system and valves in the middle pressure range, it is advantageous if the armature is arranged as possible pressure and thus force balanced. One solution is to flush the anchor. According to one embodiment, the anchor may be a flat anchor. For force calculation and force compensation, the effective area projected on the direction of movement must be taken into account. The lid is often made of a lightweight material, such as plastic, with no special requirements for the mechanical Strength of the lid are made. Such electrohydraulic valves may be used as automotive high pressure control valves, preferably for controlling pressure in a common rail diesel injection system. The valves have a hydraulic part and an electrical part. The lid sits on the electrical part. The valve housing is often significantly more mechanically stable; the valve housing is made of a metal in a known manner. Therefore, the lid has the lower mechanical strength compared to the other externally accessible components. In the case of pressure pulses and overpressures, therefore, the cover and the plug connected to it are, contrary to the intention of the valve developer, the weakest component. Even if the cover is mechanically securely connected to the edge of the valve, whereby the cover can not lift off the valve, it represents the undesirable breaking point of the valve. On the other hand, numerous advantages speak of manufacturing and manufacturing as well as aspects the material pairing for the use of a plastic lid with and without molded plug. Under the cover inside the valve, a partition wall is arranged, which separates a hydraulic high pressure area of the valve from a low pressure area of the valve. The partition may be the vorgereihte before the lid component, that is, the adjacent to the lid component. In this constructive implementation of the invention, the entire valve is operated as a pressure chamber, the anchor arranged under the cover can be operated pressure-balanced; an energy-efficient valve design.

The Partition is shaped separately. It can be called a pressure bulkhead become. The pressure bulkhead is resistant to deformation. The pressure bulkhead catches pressure surges hydraulic fluid from the adjacent components, in particular the lid from. One Schott is a component that creates safe separation areas. By the pressure bulkhead, the lid is pressure relieved. The hydraulic Valve usable in high-pressure diesel area works with an additional Pressure bulkhead for the inclusion of pressure pulses, in particular from the common rail of the motor vehicle injection system.

The Partition is arranged transversely to the valve direction. The valve direction is the axis of the valve. The axis of the valve is determined the longest route of the valve. Also lets the axis of the valve by the direction of movement of the plunger, the Anchor or otherwise for indicate the movement of certain components. In one embodiment of a Valve according to the invention can all provisions the valve axis are used interchangeably. The partition thus runs across to the ram. The pestle will biased by the spring. The plunger is supported by a spring on an area in the center of the partition. The area in the center, which after a Design of exclusively lying in the middle of the valve, by a central lift certain and limited area, is completed by the shaping. The central area can be trough-like from the level of the lid be deep-drawn. Thus, the partition is still used as a warehouse.

The Spring is guided in sections in a spring pan of the partition, whose Tray bottom serves as an abutment of the spring. A guide is also then given if the tub is designed widened, so only the lowest, narrowest part of the tub makes contact with the Making spring. The spring of the anchor will go through in the direction of movement led the tub. A lateral break is prevented.

In In one embodiment, the partition is a round, lid-like plate, having counter-formed in particular to the lid edge bulges. If the valve at least through its housing in some areas circular is, so the partition can be inserted well in these places. she blocks the pressure propagation outside the pressure chamber of the Valve.

The Bulges in the lid, which take over the function of the stiffening ribs, are star-shaped led to a middle point. Important is the stiffening effect of the ribs. The ribs are standing less high out of the lid than adjacent bumps. The ribs are according to an embodiment of the centrally arranged spring trough tapering. Due to the stiffening ribs, the lid itself can be made thinner become.

The lid or the partition wall have stop surveys. The stop surveys rise out of the lid in the same direction in which the lid edge is bent. They are thus formed equal in relation to the lid edge. The surveys are cup-shaped stop surveys. The lid, especially if it is circular in shape, can be divided into individual segments, so-called circular sections. In each segment of the partition then at least one stop survey is provided in one embodiment. The stop surveys are formed in the partition wall. The stop surveys serve as bumpers for the armature of the valve. They represent the abutment surfaces. According to one embodiment, the inner diameter of the partition is greater than the outer diameter of the armature at its widest point. The anchor preferably has a diameter such that it can enter between the edge of the lid. In one embodiment, the anchor raised in its center, the edges are made flatter. Not only the hydraulic energy is absorbed by the pressure bulkhead, but the kinetic energy in the valve can thus be reliably absorbed.

The Partition can be shaped so that centrally an anchor from the partition protrudes. The anchor is like a thorn. In one embodiment is the tub on the opening facing away Side continued with a threaded piece. To the Thread can be an insert be screwed on. The insert holds in the screwed condition the lid of the valve. The lid of the valve is clamped by the insert. The insert Hold the Cover the valve towards the partition and tighten it. The lid lets thereby lock itself better in the middle. Depending on the pressure conditions can be dispensed with a border of the lid.

The Partition can be a metallic body. In one embodiment is it cheap if it is a sheet metal part, for example, a sheet metal stamped part. Alternatively leaves Also use an aluminum sintered part as a pressure bulkhead. Both types of manufacturing are fast, reliable and cheap for simply shaped parts. Of the fitting lid is made of a softer material such as a plastic manufactured. This starts the Partition the additional Energy in the valve.

The Closing partition the hydraulic part of the valve including the anchor flushed around on both sides. To have to only passages for the electrical Contacting the coil can be provided. Thus, at least a contact passage available, especially in the usual Coil assemblies two contact passages. The partition has contact passages, the pierceable rubber-like sealing rings such as rubber knobs hydraulically sealed are. Preferably, the contact passages are formed from the partition wall are, in the same escape on a diameter section of the valve. Figuratively, the arrangement is to be presented as follows. It will be a diameter pulled through the particular circular partition. On the diameter line there is a contact passage. If it is at the connecting line is about the diameter, so is also on this connecting line the second contact passage.

The Partition is essentially a flat part. From the area, the can also be referred to as a level, the individual areas, like bucket, stopper knob and stiffening rib out. The partition is bounded by the folded edge. The individual areas can coincide with the direction of the edge of the plane, such as for example in one embodiment, the stop nubs, or opposite, so counter-shaped, such as the tub or contact passages be. The plane is interrupted by numerous forms such as tub and additional elevations, still retains she the plane Character.

When Another advantageous effect results in the more precise adjustability of Valve, even after longer Operating times of the valve. An originally made of plastic Counter bearing for the biasing spring of the armature or the plunger learned over time axial position shifts, because this is softer compared to the valve housing Cover material settlements shows. In contrast, the defined investment point promotes the bottom of the tub, made of a mechanically more stable material, how a metal is made, even after several thousand operating hours an exact starting position for the Pestle of Valve.

One There is another advantage in the task solution according to the invention in that the valve can be built up in sections. Of the Lid is made of a plastic two-piece, because by the first part of the contact pins of the coil can be performed, the after contact with flat flat cover contacts, in particular by a piercing connection, with a second part of the lid, which can be placed on the first part of the lid is, to the outside be completed. The two lid parts can afterwards through a simple plastic welding process, such as an ultrasound process, with each other get connected. The lid is only exposed to pressure conditions, which are in the range of the ambient pressure, ie at about 1 bar, while the Inside the valve in addition to a pressure separation also an additional Gasket level learns.

The Invention can be better understood when reference to the enclosed figures, wherein

1 shows a partition according to the invention in sectional view,

2 the partition according to the invention 1 in 3D representation in lateral plan view,

3 the partition according to the invention 1 and 2 in 3D view with view from below shows

4 the partition according to the invention in the installed state in the upper part of a valve shows.

5 shows a further embodiment of a partition wall according to the invention in 3D representation,

6 the partition according to the invention 5 in 3D view from rotated perspective shows and

7 the partition of the invention 5 and 6 when installed in the upper part of another valve shows.

Similar Parts in the different embodiments are to assist understanding the same reference numbers have been provided, although in some detail Deviations between different embodiments may be present.

The 1 to 3 are described at the same time. The reader may be guided by the figure, which gives him the best information about the present invention. The partition 100 , which is designed as a pressure bulkhead, is a circular object, whose individual partition plane elevations 134 from the plane of the partition 100 protrude in an orthogonal direction. The partition 100 has a center 102 around which the partition extends rotationally symmetrically in three-dimensional space. Downtown 102 is the spring pan 104 with the spring tub bottom 106 that's the counter bearing 108 for a spring, in particular an anchor spring can represent. The spring tub bottom 106 is the highest elevation of the plate in this embodiment 110 , In the opposite direction to the trough direction of the tub 104 is the edge 112 transferred. The single bulges 114 that extends over the entire surface of the dividing wall 100 distributed, have different functions depending on their design. So there is in the partition 100 at least one contact passage 122 . 124 , The contact passage 122 . 124 , which should occur twice in coil connection with a supply voltage and ground, has center holes for contact pins. The partition 100 is also with stiffening ribs 116 equipped with the mechanical stability of the partition 100 promote. Thus, the partition 100 be made thinner. The stiffening ribs are like sunbeams from the center 102 the plate 110 way out to the edge 112 directed towards. They are elongated, concave and slightly curved. Other bulges 114 are stop surveys 118 , While the stop surveys 118 on the bottom, as in 3 In the view shown on the underside, the tubs extend 104 and the contact passages 122 . 124 from the top of the round plate 110 , The round plate 110 is by the edge 112 the partition 100 laterally limited. The diameter 120 the round plate 110 extends from the edge 112 to the opposite edge 112 which is uniformly coherent.

4 shows the partition 100 of the 1 to 3 in one in a valve 1 installed condition, together with other components of the valve 1 , such as the top or outside resting lid 7 . 9 and the anchor 15 which is a flat anchor. The lid 7 . 9 is for manufacturing reasons and the associated connection technology in two parts in a lower cover 7 and an upper lid 9 , Between the two lid parts 7 . 9 is one or more flat lid contacts 37 arranged to make the forwarding of the electrical signals to and from the (not shown) plug. Some of the lid contacts 37 be through the contact pins 31 the coil 35 , which is part of the bobbin 33 is pierced. The contact pins 31 are sealed by the partition 100 carried out. At least one of the two cover parts 7 . 9 namely, the lower lid 7 , is with its lid recesses 43 the surface shape of the partition 100 tracked. The partition 100 lies in the area of valve wall rejuvenation 51 the valve wall 47 on the support flange 49 on. The anchor 15 with its anchor diameter 23 is smaller than the one in 3 represented diameter 120 the plate 110 or the partition 100 , Inside the valve 1 are the pole piece 39 , the anchor 15 and the bobbin 33 with the coil 35 all the electrical part 5 of the valve 1 be attributed. Due to the bilateral flushing of the anchor 15 , the possibility that the hydraulic medium on both the first page 17 as well as on the second side 19 of the flat anchor 15 can be present, becomes the anchor 15 also the hydraulic part 3 of the valve 1 attributed. The anchor 15 is centered by the pestle 13 interspersed. The puncture of the plunger 13 through the anchor 15 takes place in the area of the anchor center elevation 25 , At anchor center elevation 25 grips one end of the anchor spring 21 while the other end of the anchor spring 21 at the counter bearing 108 the tub 104 is applied. The anchor 15 can counter the anchor spring 21 in the anchor movement room 27 deeper into the space of the partition 100 be pressed into it. The biggest lid recess 43 of the lid 7 is for holding the tub 108 maintained. A seal to the outside of the valve 1 is through a lid gasket 41 on the top of the partition 100 ensured.

In the 5 and 6 is another embodiment of a partition 100 shown graphically. The spring pan 104 is in the upper part of the partition 100 from the plane of the partition 100 through an extension 128 been pulled up. Laterally from the spring pan 104 are the contact passages 122 . 124 arranged on the same cutting line. The extension 128 has a screw thread 130 to which the in 7 illustrated insert 29 through the internal thread 55 of the insert 29 can be screwed. The bottom of the pan 104 offers the counter bearing 108 for the in 7 illustrated anchor spring 21 , The edge 112 , a circular, down-facing edge, is provided with a recess or even circular groove (not in 1 to 3 drawn), for receiving an additional 0-ring seal as a pressure seal 136 is determined.

7 shows, as well as 4 , the upper part of a valve according to the invention 1 with its electrical part 5 and its hydraulic part 3 , The partition 100 extends radially around the center of the dividing wall, the center 102. Both sides of the partition 100 are other components of the valve 1 shown. On the outward side is the lid 11 with a surface opening for an insert 29 arranged. The insert 29 is about the internal thread 55 to the extension 128 with the external thread 130 screwed. The extension 128 stands out of the center 102 the partition 100 out. The extension 128 is by a cover extension seal 138 hydraulically with the lid 11 sealed. The insert 29 pushes over at least one Deckelanpressflügel 57 the lid 11 towards the partition 100 , Other seals 132 . 136 seal alleged passageways for the hydraulic medium. So there is a pressure seal 136 at the edge of the partition 100 and a contact passage seal 132 for the contact pin 31 , The spring pan 104 takes the anchor spring 21 at one end of the anchor spring 21 up and supports this. The other end of the anchor spring 21 stores at anchor 15 , more precisely at the anchor center elevation 25 which is a flat anchor. The flat anchor 15 is through the pestle 13 interspersed, the connection to the front, hydraulic part 3 of the valve 1 manufactures. The pole piece 39 is like in 4 through the pestle 13 interspersed. Located on the bottom of the partition 100 trained anchor movement room 27 leaves the axial mobility of the anchor 13 to. The partition 100 is with the end of the tapered part 51 the valve wall 47 of the valve 1 via a valve wall crimping 53 edged. For this purpose, the lid 11 a lid rim recess 45 on, which is designed as a circumferential groove so wide that the enclosing valve wall crimp 53 comfortably fits. The other end of the partition 100 lies on the support flange 49 the valve wall 47 on. Both sides 17 . 19 of the anchor 15 are accessible to the hydraulic medium, so that up to the pressure bulkhead-like partition 100 the full pressure of the discharge-side hydraulic fluid is given. The contact pins 31 , which break through the partition as the only components, open in the coil 35 of the bobbin 33 that is part of the electrical part 5 of the valve 1 is.

In the present case, the invention has been described essentially in two exemplary embodiments. As has become obvious, the dividing wall can 100 , after a design, a round plate 110 may have numerous differences in the details and still be considered as belonging to the present inventive teaching.

To One aspect is the pressure-retaining Function and, according to another aspect, the cover-protecting function the pressure bulkhead to be appreciated Fact of a valve realization according to the invention. Here is the actual Use of the valve, whether for example transmission control valve or Fuel pressure control valve, of subordinate importance.

1

Electrohydraulic Valve

3

hydraulic part

5

electrical part

7

Cover, in particular first part of a composite lid

9

Cover, in particular second part of a composite lid

11

Cover, in particular one-story cover

13

tappet

15

Anchor, especially flat anchors

17

First Side, in particular hydraulic side, of the flat anchor

19

Second Side, in particular cover side, of the flat anchor

21

armature spring

23

diameter of the anchor

25

Anchor central elevation

27

Armature movement space

29

Insert, in particular lid-holding insert

31

Pin, in particular coil-shaped contact pin

33

bobbins

35

Kitchen sink

37

cover contacts

39

pole

41

cover gasket

43

lid recess

45

Deckelrandausnehmung, in particular groove-like for receiving the valve wall taper

47

valve wall

49

support flange the valve wall

51

Valve wall taper, in particular Endlings arranged circumferential rejuvenation

53

Ventilwandeinbördelung

55

inner thread of the insert

57

Lid pressure wing of the the insert

100

partition wall

102

center the partition

104

spring bath

106

Spring Wannenboden

108

thrust bearing a spring, in particular an anchor spring

110

Plate, especially round plate

112

edge the partition

114

bulge

116

stiffening rib

118

stop collection

120

diameter the partition

122

first Contact passage

124

second Contact passage

128

extension

130

screw thread of the extension

132

seal a contact passage

134

Partition-level increase

136

Pressure bulkhead seal

138

Cover extension seal

Claims (14)

Electrohydraulic valve ( 1 ), in particular as a high-pressure automotive control valve, preferably for regulating a pressure in a common rail diesel injection system, with a hydraulic part ( 3 ) and an electrical part ( 5 ), which by a cover ( 7 . 9 . 11 ) on the electrical part ( 5 ) is finished with low mechanical strength, characterized in that under the cover ( 7 . 9 . 11 ) inside the valve ( 1 ) a partition wall ( 100 . 110 ) is arranged, which has a hydraulic high pressure area ( 27 ) of the valve ( 1 ) from a low-pressure region of the valve ( 1 ) separates. Electrohydraulic valve ( 1 ) according to claim 1, characterized in that the partition wall ( 100 ) is a separately formed pressure bulkhead, the deformation-stable pressure surges of a hydraulic fluid from the adjacent components ( 7 . 9 . 11 ) intercepts. Electrohydraulic valve ( 1 ) according to claim 2, characterized in that the adjacent component is a lid ( 7 . 9 . 11 ). Electrohydraulic valve ( 1 ) according to one of the preceding claims, characterized in that the partition wall ( 100 ) across a plunger ( 13 ) extending over a spring ( 21 ) at an area in the center ( 102 ) of the partition ( 100 ) is supported. Electrohydraulic valve ( 1 ) according to claim 4, characterized in that the spring ( 21 ) in a spring pan ( 104 ) of the partition ( 100 ) is guided in sections, whose bottom ( 106 ) as an abutment ( 108 ) the feather ( 21 ) serves. Electrohydraulic valve ( 21 ) according to one of the preceding claims, characterized in that the partition wall ( 100 ) a round, lid-like plate ( 110 ). Electrohydraulic valve ( 21 ) according to claim 6, characterized in that the plate ( 110 ) to the lid edge ( 112 ) counter-shaped bulges ( 114 . 134 ) having. Electrohydraulic valve ( 1 ) according to claim 7, characterized in that the bulges ( 114 . 134 ) as stiffening ribs ( 116 ) star-shaped on the centrally arranged spring pan ( 104 ). Electrohydraulic valve according to one of claims 7 to 8, characterized in that in relation to the lid edge ( 112 ) Equally formed, cup-shaped stop surveys ( 118 ) in the partition ( 100 ), the bumpers for an anchor ( 15 ) of the valve ( 1 ). Electrohydraulic valve ( 1 ) according to claim 9, characterized in that the stop surveys ( 118 ) in each segment of the segmental partition ( 100 ) and the armature ( 15 ) such a diameter ( 23 ) that between the lid edge ( 112 ) can retract. Electrohydraulic valve ( 1 ) according to one of claims 4 to 10, characterized in that centrally an anchor ( 128 ) from the partition ( 100 ) stands out, at which an insert ( 29 ) ( 55 . 130 ) is that the lid ( 11 ) of the valve ( 1 ) against the partition ( 100 ) holds. Electrohydraulic valve ( 1 ) according to one of the preceding claims, characterized in that the partition wall ( 100 ) is a metallic body and the fitting lid is made of a softer material such as a plastic. Electrohydraulic valve ( 1 ) according to claim 12, characterized in that the partition wall ( 100 ) is a sheet metal part or an aluminum sintered component. Electrohydraulic valve ( 1 ) according to one of the preceding claims, characterized in that the partition wall ( 100 ) at least one contact passage ( 122 . 124 ), which can be penetrated by pierceable rubber-like sealing rings ( 132 ) as rubber knobs are hydraulically sealed, the contact passages ( 122 . 124 ) coming out of the partition ( 100 ) are reshaped, in the same flight on a diameter section ( 120 ) of the valve ( 1 ) lie.