DE102012008634A1 - Arrangement for heating pressure reservoir of e.g. fuel injector for injecting diesel to large diesel engine in off-road vehicle, has bracket enabling flow through of fluid over bracket opening during arrangement of cover on reservoir - Google Patents

Abstract

The arrangement (2) has a cover (8) arranging over an end (5) of a pressure reservoir (3). A bracket (11) enables flow through fluid i.e. engine oil, over a bracket opening during an arrangement of the cover on the pressure reservoir, where the fluid is supplied on sides of cover. A fluid guidance case (16) passes through fluid supplied by the bracket during the arrangement of the cover on the pressure reservoir. The bracket fastening to a cylinder head and/or the fluid guidance case is supported on a cylinder head and/or an outlet end (16b). The cover and/or bracket and/or fluid guidance case are made of plastic material.

Description

The present invention relates to an arrangement for heating a pressure accumulator of an injector according to the preamble of claim 1.

Injectors for fuel injectors with integrated memory or with individual pressure accumulator cool when the engine is stopped or when operating with low engine load, whereby the flow of the pressure accumulator with hot fuel is not guaranteed or not at all. As a result, when operating with organic crude oil, for example, fuel may "freeze" in the storage tank. Heavy oil also changes its viscosity when it cools down. In the course of cooling, the injection characteristic of a respective injector is changed significantly. To avoid this, it is known in the art to surround the pressure accumulator with a sleeve, in particular above the clamping ring, which is flowed through by heated engine oil and additionally provide flow paths in the cylinder head, in particular below the clamping ring, which worked for this purpose in the cylinder head are. However, this solution is expensive and expensive.

Proceeding from this, the present invention seeks to propose an arrangement for heating the pressure accumulator of an injector, which is easy to manufacture, effective and inexpensive.

This object is achieved by the features of claim 1. Advantageous developments and embodiments are specified in the subclaims.

An arrangement for heating an accumulator of an injector, in particular a single-pressure accumulator or integrated pressure accumulator of an injector is proposed, wherein an injector in the context of the present invention is preferably an injector for a common rail fuel injector, in the context of which in addition to a respective individual pressure accumulator of an injector Also, a central accumulator can be provided. The injector is generally intended for use with internal combustion engines in the form of gasoline or diesel engines, in particular large diesel engines and further in particular vehicle engines, z. In off-road or marine applications.

An accumulator heatable by the proposed arrangement provides a required storage volume for holding fuel to be injected under high pressure, i. e. in a pressure accumulator housing. In such a pressure accumulator or its housing hochdruckbeaufschlagter fuel can preferably be introduced via a fuel inlet.

According to the invention, the arrangement has a hood for arrangement over one end of the pressure accumulator, wherein the end of the pressure accumulator is in particular a nozzle-remote end, i. e. with regard to an intended arrangement of the pressure accumulator on an injector. The hood, which can be slipped over the end of the pressure accumulator in a simple manner, is intended to be able to heat the pressure accumulator by means of introduced fluid, in particular engine oil. In this case, the hood advantageously makes it possible to introduce fluid already directly at the end of the pressure accumulator so that heating of the end of the same is also possible.

According to the invention, the arrangement further comprises a Bride or clamping strap, which is provided in particular for fixing to a cylinder head, and which is formed in the arrangement of the hood and the bridge depending on the pressure accumulator, a flow through a side of the or via the hood supplied fluid enable. For this purpose, in particular a passage opening or Bridenöffnung the Bride, in which the accumulator is introduced, be suitably formed, for. B. support sections adjacent channel sections. An accumulator is thus advantageous also via the formed Brist be heated, d. H. via the fluid flowing through it.

Advantageously, the proposed arrangement thus allows to heat the accumulator over substantial parts of its length by means of the hood and the flow-through trained Bride.

Preferably, the arrangement further comprises a Fluidleithülse, which is flowed through in each case at the pressure accumulator of a supplied via the Bride fluid i. e. from the fluid supplied to the bridge from the hood. As a result, the heatable by the arrangement surface of the pressure accumulator housing can be further increased.

The proposed arrangement advantageously makes it possible, in particular, to be able to form at least one continuous flow or fluid channel from the end of the pressure accumulator to an outlet end of the bridge by means of the hood and the bridge when arranged on the pressure accumulator or at least one continuous flow or fluid passage Fluid channel from the end of the pressure accumulator to an outlet end of the Fluidleithülse by means of the hood, the Bride and the Fluidleithülse when arranged to form each pressure accumulator.

Because of the arrangement which can be flowed through without interruption - ie, from an inlet on the hood to an outlet on the bridge or the fluid guide sleeve - it is advantageously only necessary to provide a single fluid inlet to the arrangement. The proposed arrangement further allows advantageous to be flowed through without pressure or exclusively gravity assisted. This also allows applications without their own engine oil connection or complex oil return, for example funnel-drip-catching solutions, which can be retrofitted to conventional injectors in particular.

Preferably, by means of the hood and the Bride or the hood, the Bride and the Fluidleithülse a plurality of fluid or flow channels each formed in the pressure accumulator, in particular extending over the circumference of the pressure accumulator or distributed. For this purpose, the hood and / or the bridle and / or the fluid guide sleeve preferably each have an inner contour or a fluid guide structure for the formation of respective flow channels. A Fluidleitstruktur may have raised or support sections next to recessed or Fluidleit- / channel sections. A respective fluid channel may, for example, extend helically around the pressure accumulator, for example be Z-shaped, or, for example, as a longitudinal channel.

In the present invention, the hood and / or the Bride and / or the Fluidleithülse are preferably formed, when arranged depending on the pressure accumulator, the fluid between a respective inner circumferential surface and the pressure accumulator, i. e. an outer circumferential surface of the same, to lead along, in particular distributed uniformly over the circumference of the pressure accumulator. This results in a particularly good heat transfer. An outlet end of the assembly may be formed or provided for support on a cylinder head, wherein emerging from the outlet end fluid, in particular engine oil, in an advantageously simple manner via the conventional oil guide of z. B. valve train lubricating oil can drain.

For the inflow of the at least one continuous fluid channel, the hood preferably has an upstream inlet, which is preferably arranged adjacent to the end of the pressure accumulator when the hood on the pressure accumulator and further preferably an annular channel which communicates on the one hand with the inlet and on the other hand with a respective flow - or fluid channel. This makes it possible to flow all the fluid channels uniformly and so far a good heat transfer to essential parts of the housing surface of the pressure accumulator. The inlet may preferably be designed as a funnel, alternatively z. B. also as a pressure connection.

The arrangement can be cost-effective in parts or z. B. are all made of plastic.

Also proposed is an injector, in particular for a fuel injection device, wherein the injector has a pressure accumulator and furthermore an arrangement as described above for heating the pressure accumulator.

In the context of the present invention, it can be advantageously provided to design an internal combustion engine to supply the arrangement with fluid via a drop supply or to inflate the hood. For this purpose, a fluid or oil connection line of the internal combustion engine can be guided to an inlet of the arrangement, in particular z. B. to a funnel-shaped inlet.

Further features and advantages of the invention will become apparent from the following description of embodiments of the invention, with reference to the figures of the drawings, which show details essential to the invention, and from the claims. The individual features can be realized individually for themselves or for several in any combination in a variant of the invention.

Exemplary embodiments of the invention are explained below with reference to the accompanying drawings. Show it:

1a and 1b exemplary and schematically an injector with an arrangement according to a possible embodiment of the invention and a sectional view thereof;

2 exemplary and schematically a sectional view of an arrangement according to 1 ;

3a and 3b depending on a view of the Bride the arrangement according to 1a and 1b ;

4 a view of the hood of the arrangement according to 1a and 1b ;

5 a view of the fluid sleeve of the arrangement according to 1a and 1b ;

6 a sectional view of the end of the injector with the arrangement according to 1a and 1b ; and

7 exemplary and schematic arrangement of the injector or the arrangement on a cylinder head.

In the following description and the drawings, the same reference numerals correspond to elements of the same or comparable function.

1a and b each show an injector 1 for a common rail injector with an arrangement 2 for heating a pressure accumulator 3 of the injector 1 , The injector 1 has an end with a nozzle assembly 4 on and an opposite end 5 that of the pressure accumulator 3 , in particular in the form of a single-pressure accumulator of the injector 1 is formed, ie from a housing 6 thereof. The accumulator 3 is supplied via a fuel inlet with hochdruckbeaufschlagtem fuel, which in a volume 7 of the accumulator 3 can be introduced.

The order 2 has a hood 8th , in particular a plastic hood 8th on, alternatively z. As a metal hood, which over the end 5 of the accumulator 3 slipped or arranged thereon, in particular by means of press fit, sa 6 , The hood 8th , which has cup-shaped, is in this case at a first end face 8a partially opened, Bz. 9 , so that a passage (electrical) connection elements 9a at the accumulator 3 is possible, ie on the front side. Furthermore, the hood shows 8th a fluid inlet 10 for introducing engine oil, which in the arrangement of the hood 8th at the accumulator 3 to its end 5 is adjacent. Via the fluid inlet 10 Engine oil is inside the hood 8th einbringbar, ie at a front end or inlet end 8a the same.

The hood 8th is with an outlet end 8b continue against a Bride or Spannbride 11 the arrangement 2 urged, ie sealing, which is intended to the pressure accumulator housing 6 or the injector 1 on the cylinder head 12 , eg B. 6 to be able to set or to be able to clamp against this, ie by means of clamping screws (not shown). The clamping screws can be drilled in holes 13a , b are introduced, which for this purpose in the clamping device 10 are formed, for. B. 3a and 3b ,

The clamping band 11 further comprises a Bridenöffnung or through hole 14 with an inlet end 14a and an outlet end 14b , in which the accumulator housing 6 einbringbar, ie such that the passage opening 14 from the accumulator housing 6 is dived through. For tension on the cylinder head 12 can one on the accumulator housing 6 formed ring collar 15 against the clamp 11 get to the plant, ie at the outlet end 14b ,

Furthermore, the arrangement comprises 2 a Fluidleithülse 16 with an inlet end 16a and an outlet end 16b which, on the one hand, 16b , against the cylinder head 12 is supportable and on the other hand, 16a , against the clamping strap 10 , ie at the outlet end 14b , Here is the Fluidleithülse 15 especially slightly tense. The fluid sleeve 16 , which is made as a plastic part, alternatively z. B. as a metal part, is formed, the pressure accumulator housing 6 to embrace, ie analogous to the clamping 11 ,

Visible, for. B. 2 . 3a . 3b . 4 and 5 , assign the hood 8th , the clamping strap 11 and the fluid sleeve 16 depending on a corresponding flow or Fluidleitstruktur 17 on respective inner circumferential surfaces 8c respectively. 14c respectively. 16c on. About the Fluidleitstrukturen 17 be with arrangement of the hood 8th , the clamping ring 11 and the fluid sleeve 16 at the accumulator housing 6 a plurality of continuous or uninterrupted flow or fluid channels 18 from the end 5 to the outlet 14b respectively. 16b educated. Sublime sections 17a or support sections of the Fluidleitstrukturen 17 , are suitable here, the pressure accumulator housing 6 get to the plant, while recessed, groove-shaped sections 17b are provided for fluid guidance.

The arrangement thus formed 2 on the one hand, enables the clamping strap 11 over the hood 8th be able to flow or supply with fluid or engine oil, ie, depending on the arrangement of the pressure accumulator 3 , About the inlet 10 introduced engine oil can along the continuous fluid channels formed 18 downstream to the outlet end 8a in the inlet end 14a the passage opening 14 the bridge 11 enter.

This allows the clamping device 11 on the other hand, from the side of the hood 8th supplied motor oil can also be flowed through, ie along the continuous fluid channels 18 over the bridge opening 14 , so that advantageously a large lateral surface area of the pressure accumulator housing 3 can be heated via the jointly formed, in particular uninterrupted flow path. That's the Bride 11 flowing engine oil can at the outlet end 14b in the inlet end 16a the Fluidleithülse 16 enter.

The continuous fluid channels 18 sit down in the fluid sleeve 1 Continuously gone, which thus in arrangement ever at the accumulator 3 also from the above the clamping strap 11 supplied fluid can be flowed through. In alternative embodiments, the arrangement may be provided here 2 without fluid sleeve 16 to form, ie the clamping strap 11 forms the downstream outlet end of the assembly 2 ,

On the design of the arrangement 2 will be discussed in detail below.

How the particular 2 illustrates is the majority of the continuous fluid channels 18 over the circumference of the accumulator housing 6 formed distributed. The fluid channels 18 which ever by means of the same or corresponding Fluidleitstrukturen 17 the hood 8th , the bride 11 and the sleeve 16 are formed, each extending from the end 5 to the outlet end 14b respectively. 16b that is, in the axial direction, with the channels 18 are evenly distributed over the circumference. Alternatively, z. B. channels 18 be provided, which the pressure accumulator housing 6 surrounded helically, z. B. are also Z-shaped or different.

The upstream inlet 10 which in particular is the only inlet of the arrangement 2 for the introduction of engine oil into the hood 8th forms, in this case opens into an annular space or an annular groove 19 the hood 8th (ie in the end 8a ), which communicate with the respective fluid channels 18 communicates, ie with the wells 17b the Fluidleitstrukturen 17 , This configuration allows the fluid channels 18 all advantageous over the inlet 10 be able to supply with engine oil, wherein the plurality of fluid channels 18 an all-round wetting of the pressure accumulator housing 6 and thus allows a good heat transfer. Especially with a mounting situation of the injector 1 in the engine as in 7 illustrated, ie with a tilt, such as a V-engine, the all-round wetting of the pressure accumulator housing 6 thus guaranteed.

The inlet 10 is funnel-shaped in the preferred embodiment to catch dripping engine oil, s. Arrow A in 7 , and to the ring channel 19 the hood 8th to be able to supply. This is a heating of the accumulator 3 without the use of pressure oil allows, which in particular can be omitted a corresponding oil supply. Alternatively, of course, be provided, the inlet 10 to connect with an oil supply line, z. B. a pressure oil line.

The outlet end of the assembly 2 , in this case corresponding to the end 16b , is preferred both for a support on the cylinder head 12 as well as for an oil outlet, for which purpose a toothed or serrated structure is provided, see, for example 5 , Escaping oil may be particularly at tilt of the injector 1 on the engine over the cylinder head 12 be requested, s. Arrow B in 7 , in particular to an oil guide z. B. a valvetrain lubricating oil. Alternatively, a discharge line is conceivable.

Especially 6 also shows an O-ring seal 20 for sealing at the opening 9 , ie to avoid oil leakage.

By means of the arrangement 2 can be a simple way of heating the Injektorspeichers 3 over substantial parts of the longitudinal extent of the same, ie the cylinder head 12 superior part of it. One the arrangement 2 having injector 1 can be used advantageously in an internal combustion engine, in particular in a V-engine. In this case, the internal combustion engine for drop supply to the inlet 10 be formed, z. B. a riser 21 exhibit, 7 , z. B. also be formed, dripping oil from the cylinder head cover 22 catch.

LIST OF REFERENCE NUMBERS

1

injector

2

arrangement

3

accumulator

4

nozzle assembly

5

The End

6

Accumulator housing

7

volume 6 respectively. 3

8th

Hood

8a

inlet end 8th

8b

outlet 8th

8c

Inner surface area 8th

9

opening

9a

Terminal / line

10

inlet 8th

11

Bride

12

cylinder head

13a

drilling 11

13b

drilling 11

14

Through opening 11

14a

inlet end 14

14b

outlet 14

14c

Inner surface area 11 respectively. 14

15

collar 6

16

Fluidleithülse

16a

inlet end 16

16b

outlet 16

16c

Inner surface area 16

17

flow guide

17a

raised section 17

17b

deepening 17

18

flow channel

19

ring groove 8th

20

poetry

21

oil supply

22

Cylinder head cover

A

arrow

B

arrow

Claims (12)

Arrangement ( 2 ) for heating a pressure accumulator ( 3 ) of an injector ( 1 ), the arrangement ( 2 ) a hood ( 8th ) for placement over one end ( 5 ) of the pressure accumulator ( 3 ), the arrangement ( 2 ) continues to be a bridge ( 11 ), which is formed, when arranged depending on the accumulator ( 3 ) a passage through the hood ( 8th ), in particular via a Bridenöffnung ( 14 ). Arrangement ( 2 ) according to claim 1, characterized in that the arrangement ( 2 ) a fluid guide sleeve ( 16 ), which in each arrangement at the pressure accumulator ( 3 ) from one over the Bride ( 11 ) supplied fluid can be flowed through. Arrangement ( 2 ) according to one of the preceding claims, characterized in that at least one continuous fluid channel ( 18 ) from the end ( 5 ) of the pressure accumulator ( 3 ) to an outlet end ( 14b ) the Bride ( 11 ) by means of the hood ( 8th ) and the Bride ( 11 ) when arranged on the pressure accumulator ( 3 ) is formed or at least one continuous fluid channel ( 18 ) from the end ( 5 ) of the pressure accumulator ( 3 ) to an outlet end ( 16b ) the fluid sleeve ( 16 ) by means of the hood ( 8th ), the Bride ( 11 ) and the fluid sleeve ( 16 ) when arranged on the pressure accumulator ( 3 ) is formed. Arrangement ( 2 ) according to claim 3, characterized in that a plurality of fluid channels ( 18 ) by means of the hood ( 8th ) and the Bride ( 11 ) or the hood ( 8th ), the Bride ( 11 ) and the fluid sleeve ( 16 ) depending on the arrangement on the accumulator ( 3 ) are formed, in particular over the circumference of the pressure accumulator ( 3 ). Arrangement ( 2 ) according to one of the preceding claims, characterized in that the bridge ( 11 ) for fixing to a cylinder head ( 12 ) is formed and / or the Fluidleithülse ( 16 ) for supporting on a cylinder head ( 12 ) is formed, in particular at its outlet end ( 16b ). Arrangement ( 2 ) according to one of the preceding claims, characterized in that the hood ( 8th ) an inlet ( 10 ), which in arrangement of the hood ( 8th ) at the accumulator ( 3 ) a fluid inflow of the end ( 5 ) allows the same. Arrangement ( 2 ) according to one of the preceding claims, characterized in that the hood ( 8th ) an annular channel ( 19 ), which communicates with the inlet ( 10 ), wherein the at least one fluid channel ( 18 ) via the annular channel ( 19 ), in particular all fluid channels ( 18 ). Arrangement ( 2 ) according to one of the preceding claims, characterized in that the hood ( 8th ) and / or the bridge ( 11 ) and / or the fluid guide sleeve ( 16 ) a Fluidleitstruktur ( 17 . 17a . 17b ) for forming the at least one fluid channel ( 18 ), in particular corresponding Fluidleitstrukturen ( 17 . 17a . 17b ). Arrangement ( 2 ) according to one of the preceding claims, characterized in that the hood ( 8th ) and / or the bridge ( 11 ) and / or the fluid guide sleeve ( 16 ) are formed, when arranged depending on the accumulator ( 3 ) the fluid between a respective inner circumferential surface ( 8c . 14c . 16c ) and the accumulator ( 3 ), in particular each uniformly over the circumference of the pressure accumulator ( 3 ). Arrangement ( 2 ) according to one of the preceding claims, characterized in that the arrangement ( 2 ) for a pressureless fluid supply to the inlet ( 10 ) is formed, in particular via a fluid inlet funnel ( 10 ). Arrangement ( 2 ) according to one of the preceding claims, characterized in that the hood ( 8th ) and / or the bridge ( 11 ) and / or the fluid guide sleeve ( 16 ) are made of plastic. Injector ( 1 ), in particular for a fuel injection device, wherein the injector ( 1 ) an accumulator ( 3 ), characterized in that the injector ( 1 ) an arrangement ( 2 ) according to one of the preceding claims, which at the accumulator ( 3 ) is arranged.

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