DE102019132204B4 - Pump-injector, device with pump-injector, internal combustion engine and method for fastening a pump-injector - Google Patents

Abstract

Pump-injector unit (1) with an injection nozzle (2) and a holding means (10) for fastening the pump-injector unit (1) in a cylinder head (30), the holding means (10) having a first component (11) , a second component (21) and at least one threaded pin (22), wherein the first component (11) comprises a first component section (12) and a spring (3) of the pump-nozzle unit (1) at least partially encompasses the second component section (13), and the first component section (12) is attached to a first housing section (4) of the unit injector (1) and the threaded pin (22) is arranged rotatably in an opening in the second component (21). and a first end of the grub screw (22) is inserted in a recess (15) of the second component section (13) or the first end of the grub screw (22) rests on the first component (11), and the second component (21) on a second housing section (5) of the pump-nozzle unit (1) rests displaceably.

Description

The invention relates to a unit injector with an injection nozzle. Furthermore, the invention relates to a device with at least one pump-nozzle unit. The invention also relates to an internal combustion engine. The invention also relates to a method for fastening a unit injector in a cylinder head.

According to the prior art pump-nozzle units for injection systems for internal combustion engines are known. The known units include an injection nozzle, with a fastening shoe also referred to as a standard clamping shoe being used to fasten the pump-nozzle units in a cylinder head.

A disadvantage of the known pump-nozzle units is that a fastening shoe fixed to the pump-nozzle unit fixes the pump-nozzle unit on one side in the cylinder head. Pressure applied by a screw of the fastening shoe (standard clamping shoe) causes the fastening shoe to tip over. In order to counteract tipping, the fastening shoe has a contact surface in the upper area where it can be supported against the cylinder head. However, this support creates a resultant lateral force on the pump-nozzle unit, so that it is not pressed straight down into its seat, but diagonally to the side.

Due to vibration and stress during operation, the unit injector begins to work its way into the seat on the opposite side of the clamping shoe over a long period of time. If the damage exceeds a certain level, the seals of the unit injector are no longer able to seal the resulting gap. As a result, fuel can flow past the defective sealing point and cause the well-known symptoms, namely an increase in oil due to the fuel entering the cylinder head and associated poor starting behavior due to a lack of injection pressure.

From the pamphlet DE 84 09 498 U1 discloses a unit injector with an injector nozzle and a holding means for fastening the unit in a cylinder head. The holding means comprises several components and a threaded pin. A first component includes a first component section and a second component section, the first component section being attached to a first housing section of the unit injector. The set screw is arranged in an opening of a second component. A shank of the threaded pin engages in a recess of the first component section.

From the pamphlet DE 101 44 692 A1 a fastening arrangement for unit injector elements in a cylinder head of an internal combustion engine is known.

From the pamphlet FR 2 862 350 A1 a fastening arrangement for an injection device in a cylinder head of an internal combustion engine is known. The fastening arrangement is screwed to the cylinder head by means of a screw and encloses the injection device in the manner of a fork.

The invention is therefore based on the object of overcoming the disadvantages known from the prior art.

This object is achieved by a unit injector having the features of claim 1, by a device having the features of claim 10, by an internal combustion engine having the features of claim 13 and by a method for attaching a unit injector in one Cylinder head with the features of claim 14 solved. Developing embodiments are described in the dependent claims.

• - die erste Komponente einen ersten Komponentenabschnitt und einen eine Feder der Pumpe-Düse-Einheit wenigstens teilweise umgreifenden zweiten Komponentenabschnitt aufweist, und der erste Komponentenabschnitt an einem ersten Gehäuseabschnitt der Pumpe-Düse-Einheit befestigt ist und
• - der Gewindestift drehbar in einer Öffnung der zweiten Komponente angeordnet oder eingedreht ist und ein erstes Ende des Gewindestiftes in einer Vertiefung des zweiten Komponentenabschnitts eingesetzt ist oder alternativ das erste Ende des Gewindestifts auf der ersten Komponente, insbesondere dem zweiten Komponentenabschnitt, aufsteht bzw. aufliegt, und wobei die zweite Komponente an einem zweiten Gehäuseabschnitt der Pumpe-Düse-Einheit verlagerbar anliegt.

The pump-nozzle unit according to the invention comprises an injection nozzle and a holding means for fastening, fastening or holding the pump-nozzle unit in a cylinder head, the holding means comprising a first component, a second component and at least one threaded pin, wherein

• - the first component has a first component section and a second component section at least partially encompassing a spring of the pump-nozzle unit, and the first component section is fastened to a first housing section of the pump-nozzle unit and
• - the threaded pin is rotatably arranged or screwed into an opening of the second component and a first end of the threaded pin is inserted in a recess of the second component section or alternatively the first end of the threaded pin stands or rests on the first component, in particular the second component section, and wherein the second component rests displaceably on a second housing section of the unit injector.

By providing the holding means, it is possible to secure the unit injector against lateral displacement, shifting or migration within the cylinder head, so that a constant seal within the cylinder head is guaranteed. A cylinder head replacement and further consequential damage can thus be avoided. centering Positioning or fastening of the unit injector is thus achieved by a lateral counter-support on the wall of the cylinder head using the holding means.

The holding means can be understood to mean a holding device, a holding lever, a support element, a support means, a fastening means or a positioning means of the unit injector in a cylinder head. The first housing section can be understood to mean a fastening section. The second housing section can be understood to mean a displacement section or a sliding section. The first component section is preferably offset by 90° relative to the second component section.

The retaining means may comprise a single set screw. The holding means preferably comprises at least two threaded pins. The holding means preferably comprises exactly two threaded pins. The provision of two threaded pins makes it easy to move the second component evenly.

A second end of the threaded pin preferably protrudes outwards from the second component, with the retaining means comprising a lock nut which is screwed or screwed onto the second end of the threaded pin on the upper side of the component. In other words, the lock nut is located in the area of the second end of the threaded pin above the second component of the holding means. By providing the lock nut, it is possible to shift the second component when the threaded pin is rotated. The threaded pin has an external thread. Furthermore, the opening of the second component has an internal thread receiving the external thread. A number of indentations is provided corresponding to the number of threaded pins.

The depression is particularly preferably designed as a blind hole. By providing the blind hole, a support or bearing for the threaded pin is achieved. This allows the second end of the threaded pin to be accommodated in the blind hole in order to move the second component.

More particularly preferably, the first component comprises two projecting flanges each having an opening, with the second component comprising at least one guide means projecting into the openings. The ends of the guide means can thus protrude or grip into the openings of the first component. By providing the guide means that can be displaced in the openings, the second component can be displaced in a simple manner. In addition, the first component and the second component can be captively connected to one another.

The second component preferably has a bore or opening for receiving the guide means. The guide means is preferably designed in one piece. The guide means can be a threaded pin, cotter pin or pin, in particular a sleeve pin. The first end of the threaded pin can stand up or rest on the first component in an area between the flanges.

Alternatively, the guide means is designed in two parts. One end of the guide means protrudes into the openings.

Preferably the cross section of the guide means is smaller than that of the openings. A displacement of the guide means along a defined opening or oblong hole geometry is hereby implemented in a simple manner. The openings are preferably designed as oblong holes. The first component with the flanges can particularly preferably be produced by means of 3D printing.

Alternatively, the flanges can be part of a U-profile. The flanges preferably protrude from a web of the U-profile connecting the bottle. The U-profile is preferably connected to the second component section on the web side. The first end of the threaded pin can then stand up on the web. The web is particularly preferably welded onto the second component section.

A central axis of the threaded pin is preferably parallel to the central axis of the injection nozzle. In other words, the threaded pin is arranged coaxially to the pump piston of the pump-nozzle unit.

The threaded pin preferably has a hexagon socket or a hexalobe socket. This makes it possible in a simple manner to turn or screw the threaded pin into the opening of the second component.

The first component is particularly preferably attached to the first housing section by means of at least one first attachment means. A screw can be used as the first fastening means. Two fasteners are preferably used. As a result, the first component can be attached in a twist-proof manner.

The pump-nozzle units known from the prior art usually include a retaining plate which is fastened with screws and is fastened to the housing of the injection nozzle. This retaining plate is not required for the present pump-nozzle unit Relevance. This means that the known pump-nozzle units or injection nozzles can continue to be used without a retaining plate for the present pump-nozzle unit.

The second component preferably has a ramp, the second housing section having a planar sub-area on which the ramp bears displaceably, is arranged and/or can slide on it. The ramp is preferably wedge-shaped.

The threaded pin is particularly preferably set up, as a result of its rotation, to displace the second component along the partial area in such a way that the second component disengages. In other words, rotation of the grub screw creates displacement of the second component in the sense that the inclined ramp sliding onto the planar portion causes the second component to disengage by design. The disengagement is in a direction away from the second housing section. The second component thus shifts away from the first component in both a vertical and a horizontal direction.

The device according to the invention comprises a cylinder head with at least one pump-nozzle unit, in particular four pump-nozzle units, as described above.

The device preferably includes a clamping shoe which engages in a recess in the pump-nozzle unit. The clamping shoe makes it possible to give the unit injector additional stability against displacement of the unit in the cylinder head.

The clamping shoe is particularly preferably arranged on a side of the pump-nozzle unit opposite the holding means. The clamping shoe can have a projecting section that engages in the recess of the pump-nozzle unit.

The internal combustion engine according to the invention is equipped with at least one unit injector or a device as described above.

• - Einsetzen der Pumpe-Düse-Einheit mit einer Einspritzdüse und einem Haltemittel in eine Ausnehmung des Zylinderkopfes,
• - Verdrehen eines Gewindestifts des Haltemittels zur Verlagerung einer zweiten Komponente des Haltemittels, wobei die zweite Komponente über eine Rampe entlang eines ebenen Teilbereichs eines Gehäuseabschnitts der Pumpe-Düse-Einheit gleitet und ein Ausrücken der zweiten Komponente weg vom Gehäuseabschnitt erfolgt, und in Reaktion darauf
• - Anpressen der zweiten Komponente an eine Wandung der Ausnehmung des Zylinderkopfs.

The method according to the invention for fastening or positioning a unit injector in a cylinder head comprises the following steps:

• - Insertion of the pump-nozzle unit with an injection nozzle and a holding means in a recess of the cylinder head,
• - rotating a threaded pin of the retaining means to displace a second component of the retaining means, the second component sliding along a planar portion of a housing portion of the unit injector via a ramp and disengaging the second component away from the housing portion, and in response thereto
• - Pressing the second component against a wall of the recess of the cylinder head.

As already mentioned above, the provision of the holding means makes it possible to secure the unit injector against lateral displacement or migration within the cylinder head, so that a constant seal within the cylinder head is ensured.

• - Anbringen und Fixieren eines Spannschuhs auf einer dem Haltemittel gegenüberliegenden Seite der Pumpe-Düse-Einheit.

Preferably, the method also includes the following step:

• - Attaching and fixing a clamping shoe on a holding means opposite side of the pump-nozzle unit.

To avoid repetition, the unit injector can have features of the method and vice versa.

• 1 eine schematische Darstellung einer Pumpe-Düse-Einheit aus dem Stand der Technik;
• 2 eine erste Ausführungsform der erfindungsgemäßen Pumpe-Düse-Einheit;
• 3 bis 7 schematische Ansichten, die den Zusammenbau der Ausführungsform nach 2 der Reihe nach darstellen;
• 8 eine perspektivische Ansicht der Bauteile eines Haltemittels der Pumpe-Düse-Einheit nach 2;
• 9 das Haltemittel gemäß 8 in einem zusammengebauten Zustand;
• 10 eine weitere Ausführungsform der erfindungsgemäßen Pumpe-Düse-Einheit;
• 11 eine perspektivische Ansicht der Bauteile eines Haltemittels der Pumpe-Düse-Einheit nach 10;
• 12 das Haltemittel gemäß 11 in einem zusammengebauten Zustand;
• 13 eine schematische Darstellung einer Ausführungsform der Vorrichtung;
• 14 einen Schnitt A-A durch die Vorrichtung aus 13;
• 15 ein Detail A aus 14; und
• 16 ein Detail B aus 14.

The invention is explained in more detail below with reference to the attached schematic drawings. Show it:

• 1 a schematic representation of a unit injector from the prior art;
• 2 a first embodiment of the pump-nozzle unit according to the invention;
• 3 until 7 schematic views showing the assembly of the embodiment 2 represent in sequence;
• 8th a perspective view of the components of a holding means of the unit injector 2 ;
• 9 the holding means according to 8th in an assembled state;
• 10 a further embodiment of the pump-nozzle unit according to the invention;
• 11 a perspective view of the components of a holding means of the unit injector 10 ;
• 12 the holding means according to 11 in an assembled state;
• 13 a schematic representation of an embodiment of the device;
• 14 a section AA through the device 13 ;
• 15 a detail A out 14 ; and
• 16 a detail B out 14 .

1 12 shows a pump-injector unit 50 with an injection nozzle 2 and a retaining plate 51. The retaining plate 51 is arranged on the housing of the pump-injector unit 50 by means of two fastening means 14.

2 shows a pump-nozzle unit 1 with an injection nozzle 2 and a holding means 10 for attaching the pump-nozzle unit 1 in one in the 12 until 15 shown cylinder head.

To explain the assembly of the pump-nozzle unit 1, the following is on the 3 until 7 referred. In the 3 until 7 is the assembly of the pump-nozzle unit 1 after 2 shown in sequence.

3 shows the injection nozzle 2, the retaining plate 51 without the fastening means 14, which have been detached from a first housing section 4 of the unit injector 1.

In the 4 and 5 the attachment of a first component 11 to the housing of the unit injector 1 by means of attachment means 14 is shown. The fasteners 14 are screws.

In the 6 the attachment of a second component 21 of the holding means 10 is shown. In this case, two threaded pins 22 are arranged in openings that are made in the second component 21 . The openings have an internal thread receiving the external thread of the threaded pins 22 . Also shown are lock nuts 23 which are screwed onto the two threaded pins 22 .

To the 2 until 7 it should be noted that the unit injector 1 includes the injector 2 and the holding means 10 . The holding means 10 comprises the first component 11, the second component 21 and the two threaded pins 22. The first component 11 has a first component section 12 and a second component section 13 which at least partially encompasses a spring 3 of the injection nozzle 2.

In this case, the first component section 12 is fastened to a first housing section 4 of the unit injector 1 . As mentioned above, the grub screws 22 are rotatably arranged in the openings of the second component 21 . The depressions 15 of the second component section 13 are designed as blind holes. A respective first end of the threaded pins 22 is inserted into the depression 15 of the second component section 13 . The second component 21 rests on the second housing section 5 in a displaceable manner.

A second end of the threaded pins 22 protrudes outside of the second component 21. The lock nuts 23 are screwed onto the second end of the threaded pins 22 on the upper side of the component. A central axis of the threaded pins 22 runs parallel to the central axis of the injection nozzle 2. The threaded pins 22 preferably have a hexagon socket or a hexagon socket.

Like in the 8th As shown, the second component 21 has a ramp 24 in the form of a wedge. As for example in the 3 until 5 shown, the second housing portion 5 has a flat portion 6 on which the ramp 24 of the second component 21 is movably arranged or can slide on it. The threaded pin 22 is set up, as a result of its twisting, to displace the second component 21 along the partial area 6 in such a way that the second component 21 disengages due to the design.

10 shows a further embodiment of the pump-nozzle unit 1 according to the invention with an injection nozzle 2 and a holding means 10 for fastening the pump-nozzle unit 1 in a cylinder head. In contrast to the first embodiment, the holding means 10 is designed differently.

11 shows a perspective view of the components of the holding means 10 for fastening the unit injector 1 in the cylinder head. The first component 11 comprises two cantilevered flanges 16,18 each having an opening 17,19. The flanges 16, 18 may, but need not, be interconnected by a web 20 as shown.

The second component 21 comprises a two-part guide means 25. One end of the guide means 25 projects into the openings 17, 19 on both sides. The openings 17, 19 are designed as oblong holes in order to allow the guide means 25 to be displaced along the opening or oblong hole geometry guarantee. Alternatively, only one guide means can be used, the ends of which protrude into the openings 17, 19 on both sides (not shown).

In 12 the holding means 10 is shown in an assembled state. In contrast to the holding means 10 according to the 2 until 9 is the holding means 10, the first end of the threaded pin 22 in a region between the Flanges 16, 18 on the web 20 of the first component 11 or rests against this.

13 1 shows a device comprising a cylinder head 30 with four unit injectors 1 according to FIG 2 . The device also includes a clamping shoe 35 which has a projecting section. The protruding section engages in a recess in pump-nozzle unit 1.

As in 14 shown, the clamping shoe 35 is arranged on a side of the pump-nozzle unit 1 opposite the holding means 10 .

• - Einsetzen der Pumpe-Düse-Einheit 1 mit der Einspritzdüse 2 und dem Haltemittel 10 in eine hierfür vorgesehene Ausnehmung 31 des Zylinderkopfs 30,
• - Verdrehen der Gewindestifte 22 zur Verlagerung der zweiten Komponente 21, wobei die zweite Komponente 21 über die Rampe 24 entlang des ebenen Teilbereichs 6 des zweiten Gehäuseabschnitts 5 gleitet und dabei ein Ausrücken der zweiten Komponente 21 weg vom zweiten Gehäuseabschnitt 5 erfolgt, und in Reaktion darauf
• - Anpressen der zweiten Komponente 21 an eine Wandung 32 der Ausnehmung 31 des Zylinderkopfs 30.

The following steps are carried out to fasten or position the unit injector 1 in the cylinder head 30:

• - Insertion of the pump-nozzle unit 1 with the injection nozzle 2 and the holding means 10 in a recess 31 provided for this purpose in the cylinder head 30,
• - rotating the grub screws 22 to displace the second component 21, the second component 21 sliding over the ramp 24 along the planar portion 6 of the second housing section 5, thereby disengaging the second component 21 away from the second housing section 5, and in response thereto
• - Pressing the second component 21 against a wall 32 of the recess 31 of the cylinder head 30.

• - Anbringen und Fixieren des Spannschuhs 35 auf einer dem Haltemittel 10 gegenüberliegenden Seite der Pumpe-Düse-Einheit 1.

In addition, there is the following step:

• - Attaching and fixing the clamping shoe 35 on a side of the pump-nozzle unit 1 opposite the holding means 10.

In the 15 and 15 the displacement of the second component 21 due to rotation of the threaded pins 22 is shown in more detail. Furthermore, the 15 a detail A and the 16 a detail b

In 15 the threaded pin 22 is shown in a first position. In other words, the threaded pin 22 is not twisted or turned in the opening of the second component 21, so that the second component 21 does not experience any displacement.

In 16 the threaded pin 22 is shown in a second position. In other words, the threaded pin 22 is displaced or rotated in the opening of the second component 21 in such a way that the second component 21 is displaced in relation to its initial position. The displacement takes place in the plane of the page in a vertical direction from bottom to top, with the second component 21 undergoing a slight twisting due to the design.

The provision of the holding means 10 makes it possible to secure the pump-nozzle unit 1 against lateral displacement or migration, so that a seal within the cylinder head 30 is constantly ensured. A cylinder head replacement and further consequential damage can thus be avoided. The centering, positioning or fastening of the unit injector 1 is achieved by a lateral counter-support on the wall 32 of the cylinder head 30 through the use of the holding means 10.

Reference List

1

unit injector

2

injector

3

Feather

4

first housing section

5

second housing section

6

Portion of the second housing section

10

holding means

11

first component

12

first component section

13

second component section

14

fasteners

15

deepening (blind hole)

16

first flange

17

opening

18

second flange

19

opening

20

web

21

second component

22

grub screw

23

locknut

24

ramp

25

means of guidance

30

cylinder head

31

recess

32

wall/wall

35

clamping shoe

50

State-of-the-art pump-nozzle unit

51

State-of-the-art retaining plate

Claims (15)

Pump-injector unit (1) with an injection nozzle (2) and a holding means (10) for fastening the pump-injector unit (1) in a cylinder head (30), the holding means (10) having a first component (11) , A second component (21) and at least one threaded pin (22), wherein - the first component (11) has a first component section (12) and a second component section (13) at least partially encompassing a spring (3) of the unit injector (1), and the first component section (12) on a first housing section (4) the unit injector (1) is attached and - the threaded pin (22) is rotatably arranged in an opening of the second component (21) and a first end of the threaded pin (22) is inserted in a recess (15) of the second component section (13) or the first end of the threaded pin (22) stands up on the first component (11), and wherein the second component (21) rests displaceably on a second housing section (5) of the pump-nozzle unit (1). pump-nozzle unit (1). claim 1 , wherein a second end of the threaded pin (22) protrudes outside of the second component (21), and wherein the holding means (10) comprises a lock nut (23) which is screwed onto the top of the component at the second end of the threaded pin (22). Pump-nozzle unit (1) according to one of the preceding claims, wherein the recess (15) is designed as a blind hole. Pump-nozzle unit (1) according to one of Claims 1 until 2 wherein the first component (11) comprises two projecting flanges (16, 18) each having an opening (17, 19) and the second component (21) comprises at least one guide means (25) extending into the openings (17, 19). Pump-nozzle unit (1) according to one of the preceding claims, wherein a central axis of the threaded pin (22) is parallel to the central axis of the injection nozzle (2). Pump-nozzle unit (1) according to one of the preceding claims, wherein the threaded pin (22) has a hexagon socket or a hexagon socket. Pump-nozzle unit (1) according to one of the preceding claims, wherein the first component (11) is fastened to the first housing section (4) by means of at least one first fastening means (14). Pump-nozzle unit (1) according to one of the preceding claims, wherein the second component (21) has a ramp (24), and wherein the second housing section (5) has a flat partial area (6) on which the ramp (24 ) is relocatable. pump-nozzle unit (1). claim 8 , The threaded pin (22) being set up, as a result of its rotation, to displace the second component (21) along the partial area (6) in such a way that the second component (21) disengages. Device comprising a cylinder head (30) with at least one pump-nozzle unit (1), in particular four pump-nozzle units, according to one of the preceding claims. device after claim 10 , further comprising a clamping shoe (35) which engages in a recess of the pump-nozzle unit (1). device after claim 11 , wherein the clamping shoe (35) is arranged on a side of the pump-nozzle unit (1) opposite the holding means (10). Internal combustion engine with at least one pump-nozzle unit (1) according to one of Claims 1 until 9 or a device according to any one of Claims 10 until 12 . Method for fastening a pump-nozzle unit (1), in particular according to one of Claims 1 until 9 , in a cylinder head (30), having the following steps: - Insertion of the unit injector (1) with an injection nozzle (2) and a holding means (10) in a recess (31) of the cylinder head (30), - Twisting a threaded pin (22) of the holding means (10) for displacing a second component (21) of the holding means (10), wherein the second component (21) via a ramp (24) along a flat partial area (6) of a housing section (5) of Pump-nozzle unit (1) slides and the second component (21) is disengaged away from the housing section (5), and in response thereto - the second component (21) is pressed against a wall (32) of the recess (31) of the cylinder head (30). procedure after Claim 14 , having the following step: - attaching and fixing a clamping shoe (35) on a side of the pump-nozzle unit (1) opposite the holding means (10).

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