DE102005037265A1 - High pressure fuel injection valve for internal combustion engine, has filter with inlet and outlet side and arranged in housing that is sealed between inlet and outlet sides, and support body provided on outlet side for supporting filter - Google Patents

Abstract

The valve has a filter (28) with an inlet side and an outlet side and arranged in a housing (27). The housing has bearing rings that are connected with each other through a bar and is sealed between the inlet and outlet sides of the filter. A support body (41) is provided on the outlet side for supporting the filter and has a support section. Elevations (40) supporting the filter are arranged at the support section and are in the shape of knob, bar or rib. Discharge channels (43) are formed between the elevations and run between the filter and the support section.

Description

The The invention is based on a fuel injection valve after Genus of the main claim.

It is already a fuel injector from the DE 195 32 865 A1 known, with at least one an inlet side and a drain side having filter, which is arranged on a filter housing. Such a filter is mechanically heavily loaded especially in high-pressure injection valves and deforms under certain circumstances.

Advantages of invention

The Fuel injection valve according to the invention with the characterizing features of the main claim has the Advantage that on simple way of achieving an improvement to that that the mechanical load of the filter is reduced by on the discharge side of the filter a filter abstützender Support body provided is.

By in the subclaims listed activities are advantageous developments and improvements of the main claim specified fuel injector possible.

Especially is advantageous if the support body a support section having at the filter supporting Surveys are arranged since the surveys total only a small one area the filter surface cover the filter and thus the effective filter area only slight out.

According to one advantageous embodiment the elevations are knob-shaped, web-like or ribbed formed and executed in cross-section tooth-shaped, triangular, part-circular, oval-shaped or wavy.

Farther is advantageous if formed between the surveys drainage channels are because the filtrate over the one big Flow area having drainage channels flow out can, so that the filter is still flowed through with high flow.

To an advantageous embodiment the drainage channels run drain side between the filter and the support portion of the support body.

Very It is advantageous if the filter housing has two support rings, the above at least two webs are interconnected, wherein between the Auflageringen and the webs through openings are formed, in or at which the filter is arranged. According to this embodiment is the filter designed to save space and very inexpensive to produce.

Of is further advantageous if the support body as an additional part in the filter housing can be used because the effective filter area of the filter in this way least diminished.

Also is advantageous if a lower support ring of the filter housing and a shoulder of the support body with one in the radial direction with respect to a Valve axis acting press fit between two walls of a valve housing are arranged, since the filter housing in this way very close between the inlet side and the outlet side of the filter is sealed, so that no leakage occurs past the filter.

drawing

An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. Show it 1 in section a view of a fuel injection valve, 2 a detail of the fuel injection valve with a filter according to the invention, 3 a partial view of a support body with adjacent to a filter surveys and 4 another partial view of the support body.

description of the embodiment

1 shows in section a fuel injection valve, in which the present invention could find application.

The Fuel injector serves, for example, fuel to inject into a combustion chamber of an internal combustion engine and is used for example in the so-called direct injection. But the fuel injection valve can also the fuel in a Inject intake manifold of an internal combustion engine.

The fuel injection valve has a valve housing 1 with a cylindrical first housing section 1.1 and a cylindrical second housing portion 1.2 , The second housing section 1.2 sticks out with a shoulder section 4 through one in an end wall 2 of the first housing section 1.1 arranged passage opening 3 in the first housing section 1.1 into and behind the end wall 2 with a shoulder 5 whose diameter is greater than the diameter of the through -opening 3 , The second housing section 1.2 is with the first housing section 1.1 integrally connected, for example by welding.

On the first housing section 1.1 is an input channel 7 provided for the fuel, which is in a valve room 1.3 of the valve housing 1 empties. In the valve room 1.3 is an axially movable valve needle 8th provided by means of an actuator 9 is adjustable. The actor 9 is for example an electromagnet, a piezoelectric or a magnetostrictive actuator or a shape memory actuator.

The valve needle 8th For example, assigns one to the actuator 9 facing needle shaft 10 and one the actor 9 remote valve closing body 11 on. The needle shaft 10 the valve needle 8th partially runs in the first housing section 1.1 and extends into one in the second housing section 1.2 provided feed channel 12 , The valve needle 8th is in the feed channel 12 in the axial and radial directions with respect to a valve axis 23 guided. For example, at one the actuator 9 opposite end of the feed channel 12 is a valve seat 13 formed, with which the valve closing body 11 interacts. When the fuel injection valve is closed, the valve closing body is located 11 at the valve seat 13 tight and seals the fuel injector.

The actor 9 is inside the valve chamber 1.3 for example, by an inner housing 16 surrounded to the actor 9 to encapsulate against the fuel. The feed channel 12 then does not open into the valve chamber 1.3 but in an interior 16.1 of the inner casing 16 , The inner case 16.1 is on a valve seat 13 facing end face, for example, through the shoulder portion 4 and on one the actor 9 facing end face by a valve cover 15 locked.

The inner case 16 However, it can also be omitted if the actor 9 is sufficiently fuel resistant or otherwise than with the inner housing 16 is sealed against the fuel.

Between the shoulder section 4 of the second housing section 1.2 and the housing of the first housing section 1.1 is an example, antechamber 18 formed upstream with the input channel 2 and downstream via at least one connecting channel 19 with the feed channel 12 fluidly connected. The at least one connecting channel 19 is in the shoulder section 4 provided, runs from the antechamber 18 starting, for example, radially inwardly posted the valve axis 23 and flows into the feed channel 12 ,

The diameter of the feed channel 12 is from the junction of the at least one connection channel 19 in the feed channel 12 from to near the valve seat 13 larger than the diameter of the needle shaft 10 so that an annular gap 20 is formed, which is a flow connection of the at least one connecting channel 19 out to the valve seat 13 manufactures. So no fuel through the feed channel 12 in the interior 16.1 is a seal 17 provided, for example, a corrugated bellows, which at its one end with the shoulder portion 4 and at the other end with the needle shaft 10 connected is. In the area of the feed channel 12 between the junction of the at least one connecting channel 19 in the feed channel 12 and the valve seat 13 opposite end of the feed channel 12 is at least partially no or at least almost no annular gap 20 designed to withstand the high fuel pressure in the feed channel 12 by a high pressure loss in the direction of the seal 17 reduce and around the valve needle 8th respectively.

The valve housing 1 , the inner casing 16 , the actor 9 and the valve needle 8th For example, they are concentric with respect to each other in the direction of the valve needle 8th extending valve axis 23 arranged.

After lifting the valve closing body 11 from his valve seat 13 becomes the valve needle 8th by means of a return spring 24 back to the valve seat 13 moved back. The return spring 24 is for example in the interior 16.1 arranged and acts on one on the needle shaft 10 arranged shoulder 25 on the needle shaft 10 ,

In the antechamber 18 is at least a filter 28 , For example, a mesh, arranged, which retains particles contained in the fuel. The at least one filter 28 is flowed through a filter surface. The at least one filter 28 has an inlet side 28.1 , on which the still unfiltered liquid is present, and a drain side 28.2 , about which the filtrate of the filter 28 flows. The filter 28 is at a circumference of the shoulder section 4 provided and for example at an entrance 26 the at least one connection channel 19 arranged so that the fuel just above the filter 28 in the connection channel 19 arrives.

2 shows a section of the fuel injection valve after 1 with a filter according to the invention.

The at least one filter 28 is on an example hollow cylindrical filter housing 27 arranged, for example, two, in the axial direction with respect to the valve axis 23 spaced support rings 29 which has at least three webs 30 connect with each other. Between the Auflageringen 29 and the jetties 30 are Durchtrittsöff calculations 32 educated. The flow through these passages 32 is through the filter 28 filtered, with the filter 28 For example, at a rise of the passages 32 is arranged and all passages 32 covered.

The at least one filter 28 is fixed to the filter housing 27 connected, for example by welding or gluing. A lower support ring seen in the axial direction 29.2 points towards an upper support ring 29.1 extending collar 31 on.

At the In the prior art, the filter is usually insufficiently supported in the direction of flow, so that this in the direction of the flow mechanically heavily loaded.

The invention is therefore on the drain side 28.2 of the filter 28 In addition, a filter 28 supporting support body 41 intended. The supporting body 41 has a support section 42 with the filters 28 supporting surveys 40 on. The surveys 40 are near or at the filter 28 arranged so that this the filter 28 supported against the flow direction such that it does not deform or at least hardly deformed in the direction of flow, for example, bends. The surveys 40 are formed so that they only a small part of the filter surface of the filter 28 Cover so that the effective filter area of the filter is only slightly reduced by the support body. For example, the surveys are 40 at the flow through the filter 28 only linear or punctiform on the filter 28 at.

The surveys 40 For example, have a longitudinal extent in the axial direction with respect to the valve axis 23 and are formed, for example, rib or web-shaped. The surveys 40 but may also point-shaped or knob-shaped and formed over the circumference of the support portion 42 be arranged distributed.

Between the surveys 40 are drainage channels 43 formed, through which the filtrate can flow downstream. As the support section 42 the passages 32 with the filter 28 For example, completely covered, meets the flow at the confluence in the flow channel 43 on the support section 42 , for example, is deflected by 90 degrees and flows between the filter 28 and the support section 42 at the individual surveys 40 past or along these.

According to the embodiment, the filter housing 27 and the support section 42 hollow cylindrical. The upper support ring 29.1 of the filter housing 27 has an insertion opening 47 on, through which the support body 41 in the filter housing 27 can be used. The support section 42 of the support body 41 surmounts the passage openings 32 with the filter 28 in the axial direction to a bottom wall 48 of the lower support ring 29.2 , In the area of the bottom wall 48 has the support section 42 a first recess 49 that has a flow connection to the entrance 26 of the connection channel 19 manufactures. The supporting body 41 lies with a second shoulder 46 on the upper support ring 29.1 and is integrally connected to this, for example, welded. From the second shoulder 46 starting from the support section runs 42 in the axial direction with respect to the valve axis 23 and protrudes into the filter housing 27 into it.

The lower support ring 29.2 of the valve housing 1 is with a radial direction with respect to the valve axis 23 acting press fit between two walls of the valve housing 1 is arranged, for example, between the shoulder portion 4 of the second housing section 1.2 and the housing of the first housing section 1.1 , Besides, the shoulder is 46 of the support body 41 with a radial direction with respect to the valve axis 23 acting press fit between two walls of the valve housing 1 arranged, for example, between the shoulder portion 4 of the second housing section 1.2 and the housing of the first housing section 1.1 ,

In this way is the filter housing 27 with the inserted support body 41 in the valve housing 1 arranged so tightly that no leakage between the inlet side 28.1 of the filter 28 and the drain side of the filter 28 occurs.

The second shoulder 46 has a second recess 50 on to a flow connection between the input channel 7 and the antechamber 18 to obtain.

The fuel flows over the inlet channel 7 and the second recess 50 in the antechamber 18 upstream of the filter 28 , flows through the filter 28 over the passages 32 of the filter housing 27 into the drainage channels 43 and on the support section 42 between the surveys 40 along over the first recess 49 in the connection channel 19 , From there, the fuel passes over the annular gap 20 to the valve seat 13 ,

3 shows a partial view of the support body after 2 with elevations adjacent to a filter.

After the support body 3 are the opposite to the fuel injector after 1 and 2 Constant or equivalent parts by the same reference numerals.

A the filter 28 facing peripheral wall 53 of the support section 42 is in cross section, for example, wave-shaped with elevations 40 and between the surveys 40 provided wells 54 that the drainage channels 43 form. The cross section of the surveys 40 is arbitrary and, for example, wavy, tooth-shaped, part-circular, oval, triangular or similar.

4 shows a further partial view of the support body after 2 ,

After the support body 4 are the opposite to the fuel injector after 1 to 3 Constant or equivalent parts by the same reference numerals.

Claims (10)

Fuel injection valve with at least one inlet side and a discharge side having filter, which is arranged on a filter housing, characterized in that on the discharge side ( 28.2 ) of the filter ( 28 ) a filter ( 28 ) supporting support body ( 41 ) is provided. Fuel injection valve according to claim 1, characterized in that the supporting body ( 41 ) a support section ( 42 ), on which the filter ( 28 ) supporting surveys ( 40 ) are arranged. Fuel injection valve according to claim 2, characterized in that the elevations ( 40 ) are knob-shaped, web-shaped or rib-shaped. Fuel injection valve according to claim 2, characterized in that the elevations ( 40 ) are tooth-shaped, triangular, part-circular, oval-shaped or wavy in cross-section. Fuel injection valve according to claim 2, characterized in that between the elevations ( 40 ) Drainage channels ( 43 ) are formed. Fuel injection valve according to claim 5, characterized in that the drainage channels ( 43 ) downstream between the filter ( 28 ) and the support section ( 42 ) of the supporting body ( 41 ). Fuel injection valve according to claim 1, characterized in that the filter housing ( 27 ) two support rings ( 29 ), which via at least two webs ( 30 ), wherein between the support rings ( 29 ) and the webs ( 30 ) Passages ( 32 ) are formed, in or at which the filter ( 28 ) is arranged. Fuel injection valve according to claim 2, characterized in that the supporting body ( 41 ) as an additional part in the filter housing ( 27 ) can be used. Fuel injection valve according to claim 2, characterized in that the supporting body ( 41 ) with the support section ( 42 ) in the filter housing ( 27 ) and over a shoulder ( 46 ) with the filter housing ( 27 ) is integrally connected. Fuel injection valve according to claim 9, characterized in that a lower support ring ( 29.2 ) of the filter housing ( 27 ) and a shoulder ( 46 ) of the supporting body ( 41 ) with a radial direction with respect to a valve axis ( 23 ) acting press fit between two walls of a valve housing ( 1 ) is arranged.