DE102012104531A1 - Valve assembly for fuel injection nozzle, has rod-shaped valve actuator that is provided in sealing boarders at outlet side, and flow throttling device is integrated in rod-shaped valve actuator - Google Patents

Abstract

The valve assembly (3) has inlet side that is provided with sealing boarders. The sealing zones (12,13) are provided to seal a transversely displaceable seat element (7) on contact surface (9) formed on inlet side. A rod-shaped valve actuator (11) is provided in sealing boarders at outlet side. A flow throttling device (45) is integrated in the rod-shaped valve actuator. The tap-shaped throttle structures (18) are provided with throttle recesses e.g. throttle gutters (19). An independent claim is included for a fuel injection nozzle.

Description

Valve assemblies with hubverstellbarem against a valve seat, rod-shaped valve actuator are exposed to quite contradictory requirements in axially modular layered and clamped injectors, as regardless of the layered structure valve seat and valve actuator in the closed position must be centered against each other and also a low-friction as possible and closely tolerated to prevent leakage and elongated guide for the valve actuator is sought.

In spite of these contradictory requirements - as tension-free, low-friction, tightly toleranced and elongated guide for the valve actuator in exact alignment with the valve seat - to come from a cost point of view to manufacturing technology and functionally satisfactory solutions, it is known to associate the valve seat a seat body as separate, transversely floating component is accommodated in a receiving space opposite to the valve actuator and supported on a flat contact surface.

In such, from the WO 2006/021015 A1 known solution, the seat body is provided with a surrounding to a discharge opening and corresponding to a sealing zone of the valve actuator sealing zone and designed as a socket which rests on its one end face on the contact surface and having on its outer periphery to the enclosing receiving space channels. These channels form throttle channels, which lie in the flow from the control chamber to the outflow opening in the seat body, so that the designed as a socket seat body is acted upon in the flow direction, ie in the direction of the contact surface on its opposite this end face only with correspondingly reduced throttling pressure. As a result, the bush-shaped seat body is relatively easily displaceable even under flow influences from its position on the valve actuator position, which in the process of the valve actuator against the seat body, so when moving the valve actuator into its closed position respectively corresponding reorientation of the seat body, regardless of the fact that the valve actuator is provided at the end with a pin-like, immersed in the discharge opening extension.

The invention is based on the object regardless of the floating support of the seat body whose centered alignment with the valve actuator as far as possible to ensure even when lifted from the seat position valve actuator.

According to the invention for this purpose downstream of the control chamber throttle arrangement is downstream in the outflow direction, ie provided downstream of the formed by the cooperating sealing zones of seat body and valve actuator sealing boundary, and in particular the fact that the valve actuator protruding beyond its front side has a projecting into a through hole in the seat body throttle body over the throttling of the process from the control chamber is carried out at its stroke position out of its blocking position in its open position valve actuator.

Conveniently, for this purpose, the rod-shaped valve actuator against the through hole in the seat body, with a corresponding conical design, formed on a peg-shaped extension tapers. At the extension includes, in particular disc-shaped, tail as a throttle body. This throttle body extends in diameter almost to the diameter of the through hole in the seat body zoom and is preferably provided with peripheral, open to the circumference flow cross-sections, in particular groove-shaped flow cross-sections. Corresponding throttle cross-sections can also be formed by bores in the throttle body or recesses in the seat body, in particular in the periphery of the through hole.

Based on the closed position of the valve actuator, the seat body in its height - ie in the flow direction - preferably dimensioned such that the disc-shaped end piece, which forms the throttle body, almost comes close to the contact surface for the seat body, bringing the desired throttling substantially in height the transition of the seat body results to Aufsetzfläche. In principle, the throttle body can also extend axially beyond the seat body, thus also lying in the region of a drainage bore arranged downstream of the through-bore.

The invention further relates to a simplified embodiment of a valve arrangement, as they can be used in the transition between two successive supported in a plane surface components, in particular modules of a fuel injection injector, if the structural conditions favorable conditions both for the relevant processing as also provides for an exactly perpendicular to the plane surface, in particular elongated guide bore with close clearance for a stroke-adjustable valve actuator.

The guide bore for the stroke-adjustable valve actuator is for this purpose, as a guide bore in the axially opposite braced, other component provided drain hole, from a receiving space as a transitional space, which is connected to the control room. The stroke-adjustable, rod-shaped valve actuator is frontally with a projecting in the direction of the drain hole and the input cross-section encompassing sealing edge provided. This sealing edge is formed circumferentially to the valve actuator as a cutting edge, which is preferably in the circumferential plane of the valve actuator, or at least in the area. Starting from the cutting edge, the valve actuator is concave at the end, in particular tapered, preferably converging on a front side and lying in coverage to the drain hole depression of the valve member. Such a basic structure allows manufacturing technology because of the voltage applied to the abutting flat surfaces of the clamped components perpendicular guide bore for the valve actuator very close tolerances and thus a particularly favorable under leakage points solution.

Further details and features of the invention will become apparent from the claims. Furthermore, the invention will be explained in more detail below with reference to exemplary embodiments, which represent a section of an injection injector of a modular construction, as described for example in FIG 6 and 7 the mentioned in the prior art WO 2006/061015 is shown and explained with respect to the integration into a fuel injection injector.

With reference to a modular fuel injection injector illustrated 1 two modules 1 . 2 of the axially compressed fuel injection injector with in the transition region between the modules 1 . 2 lying valve assembly 3 , The valve arrangement 3 controls the transition from an outgoing from a control room not shown here drain line 4 placed on a front side between the modules 1 and 2 lying, in the module 1 trained recording room 5 leads to a drain hole 6 such that the pressure in the control chamber with the valve assembly open 3 is reduced. The valve arrangement 3 includes a seat body 7 , the one through hole 16 has and annularly bounded to the input cross-section 8th the drain hole 6 lies. The seat body 7 For its part, it lies flat and can be moved transversely and floating on the flat surface 9 on, which is in the particular formed by a support plane investment zone between the modules 1 and 2 extends.

Perpendicular to the contact surface 9 , and thus also perpendicular to the support plane between the modules 1 and 2 , extends in the module 1 in axial extension of the drain hole 6 the guide hole 10 for the rod-shaped valve actuator 11 that is above a symbolic only by the arrow 44 illustrated actuatorics 20 is adjustable in stroke and in the closed position shown, spring-loaded, via conical sealing zones 12 and 13 with the seat body 7 interacts, resting on the touchdown surface 9 the input cross section 8th the drain hole 6 sealingly encloses.

The sealing zones 12 and 13 are formed by sealing cones, which on the part of the valve actuator 11 through a frontal conical incision or extension 14 and on the part of the seat body 7 through a correspondingly inclined ring zone 15 are formed. The ring zone 15 of the seat body 7 runs according to the design according to the invention 1 radially inward on the through hole 16 of the seat body 7 out. This may also be graded, for example in a single increment, as in 1 dashed at 46 indicated. The through hole 16 lies in overlap to the input cross section 8th the drain hole 6 ,

Basically, in the context of the invention, deviating from 1 and in 4 also shown only schematically, also a radially outer grip of the valve actuator 46 to the annular seat body 47 be given in the region of the conical sealing zones, which in this solution radially outward on the seat body 47 are provided. This regardless of the engagement in the through hole 48 with a central extension 49 who is in a throttle body 50 expires. The seat body 47 is in such a solution with a radially outer, a sealing zone forming, in particular conical annular zone 51 provided by a conically widening ring zone 52 of the valve actuator 46 is overruled. By the diameter ratio of the guide bore 43 and with respect to this diameter smaller seal diameter between valve actuator 46 and seat body 47 can influence the size of a valve spring on the valve actuator 46 applied and to maintain the closed position of the valve actuator 46 take the required force of the valve retaining spring.

Based on the illustration according to 1 has the through hole 16 subsequent to the radial inlet of the sealing zone 13 an axially extending ring section 17 on. Within this ring section 17 lies next to the conical extension 14 of the valve actuator 11 provided, disk-shaped throttle body 18 which radially substantially the cross section of the ring portion 17 the through hole 16 covered and the circumference with throttling recesses, in particular throttle channels or throttle grooves 19 and / or provided with throttling through-holes. By lifting the valve actuator 11 open valve arrangement 3 results downstream of this a throttled transition to the drain hole 6 ,

This is the seat body 7 even with raised valve actuator 11 according to the pressure in the control room in the direction of the plane contact surface 9 pressurized and also stabilized in position. In addition, results from the in the region of the ring section 17 throttled flow a stabilization of the radial position of the seat body 7 on through the conical sealing zones 12 . 13 predetermined support position between the valve actuator 11 and the seat body 7 ,

While in 1 a valve assembly is illustrated, which is functionally a 2-way valve with a drainage restriction arrangement 45 combined and, in particular in the illustrated and described embodiment, by the integrated throttle function even under unfavorable tolerance conditions provides a satisfactory valve function, regardless of the additional realization of a throttle function illustrated 2 another, functionally a 2-way valve-forming valve assembly 21 , which is characterized by particular simplicity and is particularly advantageous to use with good controllable tolerance conditions. The starting position for the valve assembly 21 according to 2 , again illustrated in conjunction with a modular compound injection injector, is by two modules 22 . 23 determined, based on one in at least one of the modules 22 respectively. 23 provided bore, in particular the guide bore 24 , for a stroke-adjustable valve actuator 25 in a vertical plane of contact with this bore 26 are supported against each other frontally. One of the end faces forms the contact surface 27 for the valve actuator 25 that in the guide hole 24 Hubverstellbar is guided. About the valve actuator 25 is in the closed position of the input cross-section 28 a drain hole 29 shut off. The drain hole 29 goes from one between the modules 22 . 23 lying transitional space 30 from, on the over, for example, from the control chamber of a fuel injection injector outbound pressurized drain line 31 opens.

The valve actuator 25 lies overlapping to the input cross section 28 the drain hole 29 and overlaps the input cross section 28 radially outward, the valve actuator 25 against the contact surface 27 via a front side along its circumference sealing edge 32 runs out, which is formed like a cutting edge. This prefers in that the end face of the rod-like valve actuator 25 if necessary concavely arched and against the sealing edge 32 in a conically drawn ring zone 33 expires. In the embodiment, this ring zone goes 33 radially inward from a central recess 34 out. Due to the inclination of the ring zone 33 lets the cutting angle of the along the circumference of the valve actuator 25 extending sealing edge 32 determine who with 35 is designated. In such a solution, wherein the sealing edge 32 offset radially outwards to the circumference of the inlet cross-section 28 on the mounting surface 27 seated, is without affecting the sealing function, a certain transverse offset between the guide bore 24 and the input cross section 28 possible, so in the direction of the touch plane 26 Given tolerances can be compensated.

Referring to the embodiment according to 1 illustrates 3 a possible use of such combined with a throttle valve arrangement 3 for the realization of the function of a 3/2-way valve by means of a 2/2-way valve and associated throttle function.

In the highly schematic embodiment according to 3 is with 36 the control chamber of a fuel injection injector referred, with 37 the pin one on the control room 36 expiring, depending on the pressure in the control room 36 stroke-adjustable nozzle needle. To a through connection running between a high pressure side HD and a low pressure side ND 38 is a branch line 39 connected to the control room 36 empties. Inlet side and outlet side to the branch line 39 are in the transit connection 38 restrictors 40 . 41 intended.

To illustrate the invention, it is initially assumed that only to the outlet-side throttle point 41 a "blocking flap" 42 is intended as a "2-way valve". Is this 2-way valve, so the blocking flap 42 , opened, the pressurization of the supplied via the branch control room corresponds 36 the ratio of the throttle cross sections of the throttle points 40 and 41 , The control room 36 is thus acted upon by a pressure which is well above the leakage pressure, about half the system pressure corresponding pressure and the opening of the control chamber through the mediation of the pin 37 pressure-loaded nozzle needle is sufficient.

Is also the inlet-side throttle point 40 a "blocking flap" 43 assigned, it can be turned off on this in the function of the "2-way valve" in the closed state of the inlet to the junction, and thus the control room, so that for the control room 36 only a residual pressure corresponding to the leakage pressure remains. Is only, as mentioned above, the drain-side throttle point 41 a blocking flap 42 provided, so can be for the control room 36 reach an admission with full system pressure.

It is thus when using valve assemblies 3 according to 1 or 4 to the inlet and / or outlet side throttle point 40 . 41 all variations of a variable in the flow section 3/2-way valve with only two 2-way valves in Allocation to anyway provided throttle points 40 . 41 to realize, with these throttle points 40 . 41 when using valve assemblies according to 1 or 4 integrated in the valve assembly according to the invention can represent.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2006/021015 A1 [0003]
• WO 2006/061015 [0010]

Claims (8)

Valve arrangement ( 3 ), in particular for fuel injection injectors, the inlet side has a sealing limit, which by sealing zones ( 12 . 13 ) one to a contact surface ( 9 ) floating transversely movable seat body ( 7 ) and an inlet-side, stroke-adjustable, in particular rod-shaped valve actuator ( 11 ) is formed and in the downstream side to the sealing boundary an outlet throttle arrangement ( 45 ) is integrated. Valve arrangement according to claim 1, characterized in that the inlet-side sealing boundary is arranged in the sequence of a control chamber. Valve arrangement according to claim 1 or 2, characterized in that the outlet throttle arrangement ( 45 ) an end face on the valve actuator ( 11 ) and of the seat body ( 7 ) circumferentially enclosed, peg-shaped throttle body ( 18 ) having. Valve arrangement according to claim 3, characterized in that the pin-shaped throttle body ( 18 ) is provided with throttling recesses, in particular with peripheral throttle channels. Valve arrangement, in particular for fuel injection injectors, in particular according to one of the preceding claims, with a receiving space located in an inlet-side, throttled outlet, in particular by a control room ( 5 ) for a seat body ( 7 ) leading to a contact surface ( 9 ) is arranged floating in a transversely displaceable manner, with one in the seat body ( 7 ) and with a drain hole ( 6 ) in the contact surface ( 9 ) through-hole ( 16 ), • with an axial to the drain hole ( 6 ) stroke-adjustable, in particular rod-shaped valve actuator ( 11 ), • with a by corresponding to each other, in particular conical sealing zones ( 12 . 13 ) on the seat body ( 7 ) and on the valve actuator ( 11 ) formed sealing edge, and • with a downstream in the outflow direction provided for sealing boundary drainage arrangement ( 45 ). Fuel injection injector, in particular according to one or more of the preceding claims, with a through connection connecting a high-pressure-side inlet and a low-pressure-side outlet ( 38 ) for the fuel to be supplied to the injector, with the passage connection ( 38 ) of the injector provided branch on a branch line ( 39 ), With inlet and outlet side to the branch in the passage connection ( 38 ) ( 40 . 41 ), and • with a valve arrangement provided at the inlet and / or outlet ( 3 ), which is designed as a supply and / or outlet side throttle point combined 2/2-way valve. Fuel injection injector according to claim 6, characterized in that the 2/2-way valve a Aufsetzfläche ( 9 ) for a transversely seated, an input cross-section ( 8th ) to a drain hole ( 6 ) in the contact surface ( 9 ) enclosing seat body ( 7 ), one to the input cross section ( 8th ) overlapping through-bore ( 16 ) in the seat body ( 7 ), an axial to the seat body ( 7 ) adjustable valve actuator ( 11 ), mutually corresponding, in particular conical sealing zones on the seat body ( 7 ) and valve actuator ( 11 ) and one in the through hole ( 16 ) of the seat body ( 7 ) axially engaging and in particular circumferentially to the through hole ( 16 ) delimiting a throttle cross-section, frontally to the valve actuator ( 11 ) provided, in particular peg-shaped, throttle body ( 18 ) having. Valve arrangement, in particular for fuel injectors, having in the transition between two in a plane surface supported components, in particular modules ( 22 . 23 ), with a transition between the components (modules 22 . 23 ) transitional space ( 30 ), with one from the transitional area ( 30 ) outgoing input cross-section ( 28 ) to a drain hole ( 29 ) in which one of the components (module 23 ), with in the other of the components (module 22 ), against the drain hole ( 29 ) extending, stroke-adjustable, in particular rod-shaped valve actuator ( 25 ), with the input cross section ( 28 ) of the drain hole ( 29 ) encompassing, frontally on the valve actuator ( 25 ) and in the direction of the footprint ( 27 ) projecting sealing edge ( 32 ), which peripherally to the valve actuator ( 25 ) is provided on the end face and a front-side recess ( 34 ) in the valve actuator ( 25 ) encloses.

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