CA2494294C - Fuel injection nozzle - Google Patents
Fuel injection nozzle Download PDFInfo
- Publication number
- CA2494294C CA2494294C CA 2494294 CA2494294A CA2494294C CA 2494294 C CA2494294 C CA 2494294C CA 2494294 CA2494294 CA 2494294 CA 2494294 A CA2494294 A CA 2494294A CA 2494294 C CA2494294 C CA 2494294C
- Authority
- CA
- Canada
- Prior art keywords
- pressure
- fuel injection
- nozzle
- injection nozzle
- nozzle needle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/161—Means for adjusting injection-valve lift
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
- F02M61/182—Discharge orifices being situated in different transversal planes with respect to valve member direction of movement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/06—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves being furnished at seated ends with pintle or plug shaped extensions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
In order to obtain a simple, space-saving construction and in order to be used in various injection systems, a fuel injection nozzle having a nozzle needle, which is held in the closed position under the action of a spring and can be opened up by the pressure of the fuel which is to be injected, has a control piston which can be acted upon or can be relieved from pressure by means of a pressure fluid in order to transfer it into one of two different axial positions and which limits the opening travel of the nozzle needle in order to open up one or more rows of injection-nozzle holes.
Description
~'uol inj~retion nomzl~
The invention relates to a fuel injection nozzle having a housing in which a nozzle needle, which is held in the closed position by bearing against a seat under the action of a spring and can be opened up by the pressure of the injected fuel, is arranged.
The invention is based on the object of providing a fuel injection nozzle which is of simple and space-saving construction, can be transferred into two different operating positions for full load and part load and the use of which is not limited to a special injection system.
According to the invention, this is achieved by the provision of a control piston which can be acted upon or can be relieved from pressure by means of a pressure fluid in order to transfer it into one of two different axial positions and which limits the opening travel of the nozzle needle in order to open up one or more rows of injection-nozzle holes.
This results in a simple construction which can be accommodated within the contours of a normal fuel injection nozzle.
That end surface of the control piston which faces away from the nozzle needle is preferably pressurized in a part-load position, which limits the opening travel of the nozzle needle in order to open up one row of injection-nozzle holes, and is relieved from pressure in a further full-load position, which opens up all of the rows of injection-nozzle holes which are arranged one above another.
According to a further preferred refinement of the invention, the control piston, in the part-load position, bears with its end surface which faces the nozzle needle against a stop fixed on the housing. The control piston, in the full-load position, preferably bears with an end surface which faces away from the nozzle needle against a further stop fixed on the housing. This results in precisely defined operating positions for the two load ranges.
Further features and advantages of the invention emerge from the additional subclaims and a description of two exemplary embodiments with reference to the drawings, in which, in each case in a vertical section:
Figure 1 shows a fuel injection nozzle with fuel as the pressure fluid, Figure 2 shows a fuel injection nozzle with lubricating oil as the pressure fluid.
The injection nozzle according to Figure 1 has a housing composed of three parts 1, 2, 3. A nozzle needle 4 which has a section 5 of enlarged diameter is guided in an axially displaceable manner in the housing 1. The section 5 protrudes into a pressure space 6 to which the fuel which is to be injected is fed via a line 7. The lower end of the valve needle 4 bears against a seat 9 under the action of a spring 8. Situated in this end of the valve needle 4 is a control pin 10 which passes through a connecting space 11. A
first row of injection-nozzle holes 12 leads into the connecting space 11. The lower end of the control pin 10 protrudes in a sealing manner into a further connecting space 13 into which at least one further row of injection-nozzle holes 14 leads.
In the inoperative position illustrated in Figure 1, the upper end surface l5 of the nozzle needle 4, which is of two-part design, is situated at a distance h1 from the lower end surface 16 of a control piston 17, which is guided in the axial direction in the housing part 2. In this case, the control piston 17 bears with the edge of its lower end surface 16 against an annular stop 18, which is fixed on the housing. The control piston 17 passes through an annular chamber 19 which is connected via a line 20 to the fuel-conducting line 7. From the chamber 19 a line 21 in the control piston 17 leads to a pressure space 22 above the upper end surface 23 of the control piston 17. The pressure space 22 is limited laterally by the housing part 2 and at the top by a plate-shaped stop 24. The stop 24 has a bore 25 which can be closed by a closure element. The closure element has a closure ball 26 which can be held in the closure position by means of an adjusting rod 27. The adjusting rod 27 can be adjusted as a function of the load state of the engine in such a manner that, in the inoperative position and in the part-load position, the closure ball 26 is held in the closed position and, in the full-load position, the closure ball opens up, so that the fuel can flow off through a line 28. However, closure elements which are constructed in a different manner and are opened and closed as a function of the engine power can also be used.
If, in the setting for the part-load range, in which the closure element 26, 27 is closed, fuel is conducted under pressure through the line 7, then pressure likewise builds up into the pressure space 22 via the lines 20, 21 and presses the control piston 17 against the stop 18. At the same time, the nozzle needle 4 is lifted from the seat 9 until its end surface 15 bears against the end surface 16.
With appropriate dimensioning, on the one hand, of the surfaces transferring the nozzle needle 4 into the opening movement and, on the other hand, of the end surface 23, the control piston 17 remains bearing against the stop 18 as a consequence of the pressure in the pressure space 20. The nozzle needle 4 can therefore move only by the distance hl such that fuel emerges from the injection-nozzle holes 12 via the collecting space 11.
When the adjusting rod 27 is transferred to full-load operating, it opens up the closure ball 26. If the fuel now passes through the lines 20, 21 into the pressure space 22, it flows off via the line 28. The control piston 17 can therefore additionally move by the distance h2 until it bears against the stop 24. This movement is followed by the nozzle needle 4. In the process, the control pin 10 exits from the collecting space 13. The fuel therefore also passes to the injection-nozzle holes 14.
The arrangement according to Figure 2 is, in principle, constructed in the same manner as the arrangement from Figure 1. The sole difference here is that the chamber 19 is connected to a line 30 to which lubricating oil is fed under pressure by means of a pump 31. This lubricating oil then passes via the line 21 into the pressure space 22. The further functioning corresponds with the arrangement from Figure 1. There is also the possibility of charging the pressure space 22 with a pressure fluid from a separate liquid circuit.
The invention relates to a fuel injection nozzle having a housing in which a nozzle needle, which is held in the closed position by bearing against a seat under the action of a spring and can be opened up by the pressure of the injected fuel, is arranged.
The invention is based on the object of providing a fuel injection nozzle which is of simple and space-saving construction, can be transferred into two different operating positions for full load and part load and the use of which is not limited to a special injection system.
According to the invention, this is achieved by the provision of a control piston which can be acted upon or can be relieved from pressure by means of a pressure fluid in order to transfer it into one of two different axial positions and which limits the opening travel of the nozzle needle in order to open up one or more rows of injection-nozzle holes.
This results in a simple construction which can be accommodated within the contours of a normal fuel injection nozzle.
That end surface of the control piston which faces away from the nozzle needle is preferably pressurized in a part-load position, which limits the opening travel of the nozzle needle in order to open up one row of injection-nozzle holes, and is relieved from pressure in a further full-load position, which opens up all of the rows of injection-nozzle holes which are arranged one above another.
According to a further preferred refinement of the invention, the control piston, in the part-load position, bears with its end surface which faces the nozzle needle against a stop fixed on the housing. The control piston, in the full-load position, preferably bears with an end surface which faces away from the nozzle needle against a further stop fixed on the housing. This results in precisely defined operating positions for the two load ranges.
Further features and advantages of the invention emerge from the additional subclaims and a description of two exemplary embodiments with reference to the drawings, in which, in each case in a vertical section:
Figure 1 shows a fuel injection nozzle with fuel as the pressure fluid, Figure 2 shows a fuel injection nozzle with lubricating oil as the pressure fluid.
The injection nozzle according to Figure 1 has a housing composed of three parts 1, 2, 3. A nozzle needle 4 which has a section 5 of enlarged diameter is guided in an axially displaceable manner in the housing 1. The section 5 protrudes into a pressure space 6 to which the fuel which is to be injected is fed via a line 7. The lower end of the valve needle 4 bears against a seat 9 under the action of a spring 8. Situated in this end of the valve needle 4 is a control pin 10 which passes through a connecting space 11. A
first row of injection-nozzle holes 12 leads into the connecting space 11. The lower end of the control pin 10 protrudes in a sealing manner into a further connecting space 13 into which at least one further row of injection-nozzle holes 14 leads.
In the inoperative position illustrated in Figure 1, the upper end surface l5 of the nozzle needle 4, which is of two-part design, is situated at a distance h1 from the lower end surface 16 of a control piston 17, which is guided in the axial direction in the housing part 2. In this case, the control piston 17 bears with the edge of its lower end surface 16 against an annular stop 18, which is fixed on the housing. The control piston 17 passes through an annular chamber 19 which is connected via a line 20 to the fuel-conducting line 7. From the chamber 19 a line 21 in the control piston 17 leads to a pressure space 22 above the upper end surface 23 of the control piston 17. The pressure space 22 is limited laterally by the housing part 2 and at the top by a plate-shaped stop 24. The stop 24 has a bore 25 which can be closed by a closure element. The closure element has a closure ball 26 which can be held in the closure position by means of an adjusting rod 27. The adjusting rod 27 can be adjusted as a function of the load state of the engine in such a manner that, in the inoperative position and in the part-load position, the closure ball 26 is held in the closed position and, in the full-load position, the closure ball opens up, so that the fuel can flow off through a line 28. However, closure elements which are constructed in a different manner and are opened and closed as a function of the engine power can also be used.
If, in the setting for the part-load range, in which the closure element 26, 27 is closed, fuel is conducted under pressure through the line 7, then pressure likewise builds up into the pressure space 22 via the lines 20, 21 and presses the control piston 17 against the stop 18. At the same time, the nozzle needle 4 is lifted from the seat 9 until its end surface 15 bears against the end surface 16.
With appropriate dimensioning, on the one hand, of the surfaces transferring the nozzle needle 4 into the opening movement and, on the other hand, of the end surface 23, the control piston 17 remains bearing against the stop 18 as a consequence of the pressure in the pressure space 20. The nozzle needle 4 can therefore move only by the distance hl such that fuel emerges from the injection-nozzle holes 12 via the collecting space 11.
When the adjusting rod 27 is transferred to full-load operating, it opens up the closure ball 26. If the fuel now passes through the lines 20, 21 into the pressure space 22, it flows off via the line 28. The control piston 17 can therefore additionally move by the distance h2 until it bears against the stop 24. This movement is followed by the nozzle needle 4. In the process, the control pin 10 exits from the collecting space 13. The fuel therefore also passes to the injection-nozzle holes 14.
The arrangement according to Figure 2 is, in principle, constructed in the same manner as the arrangement from Figure 1. The sole difference here is that the chamber 19 is connected to a line 30 to which lubricating oil is fed under pressure by means of a pump 31. This lubricating oil then passes via the line 21 into the pressure space 22. The further functioning corresponds with the arrangement from Figure 1. There is also the possibility of charging the pressure space 22 with a pressure fluid from a separate liquid circuit.
Claims (10)
1. A fuel injection nozzle having a housing in which a nozzle needle, which is held in the closed position by bearing against a seat under the action of a spring and can be opened up by the pressure of an injected fuel, is arranged, characterized by a control piston (17) which can be acted upon or can be relieved from pressure by means of a pressure fluid in order to transfer it into one of two different axial positions; which limits an opening travel of the nozzle needle (4) in order to open up one or more rows of a plurality of rows of injection-nozzle holes (12, 14) in said housing; and wherein an end surface (23) which faces away from the nozzle needle (4) is pressurized in a part-load position, which limits the opening travel of the nozzle needle in order to open up at least one row of injection-nozzle holes (12), and is relieved from pressure in a full-load position, which opens up all of the rows of injection-nozzle holes (12, 14) which are arranged one above another.
2. A fuel injection nozzle according to Claim 1, characterized in that the control piston (17), in the part-load position, bears with its end surface (16) which faces the nozzle needle (4) against a stop (18) fixed on the housing.
3. A fuel injection nozzle according to Claim 1 or 2, characterized in that the control piston (17), in the full-load position, bears with its end surface (23) which faces away from the nozzle needle (4) against a stop (24) fixed on the housing.
4. A fuel injection nozzle according to any one of Claims 1 to 3, characterized in that a pressure space (22) which can be charged with pressure fluid is provided above the control piston (17), and the pressure space can be relieved from pressure in the full-load position by means of a closure element (26, 27) controlled as a function of the engine power.
5. A fuel injection nozzle according to any one of Claims 1 to 4, characterized in that the control piston (17) has a line (21) leading from a lateral, annular chamber (19) for the pressure fluid to a pressure space (22).
6. A fuel injection nozzle according to any one of Claims 1 to 5, characterized in that a closure element (26, 27) has an adjusting rod (27) which is activated as a function of the engine power and holds a closure ball (26) in a closed position in a part-load range.
7. A fuel injection nozzle according to any one of Claims 1 to 6, characterized in that fuel is used as the pressure fluid.
8. A fuel injection nozzle according to any one of Claims 1 to 5; characterized in that lubricating oil is used as the pressure fluid.
9. A fuel injection nozzle according to Claim 8, characterized in that a pump (31) increasing the pressure is provided in a lubricating-oil inflow (30).
10. A fuel injection nozzle according to any one of Claims 1 to 9, characterized in that a collecting space (11) leading to a first row of injection-nozzle holes (12) is arranged downstream of the seat (9) of the nozzle needle (4) and the nozzle needle (4) has a control pin (10) which passes through the collecting space (11) and, in an inoperative position and in the part-load position, protrudes in a sealing manner into a further collecting space (13) for remaining injection-nozzle holes (14) and, in the full-load position, opens up an inflow to the further collecting space (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2494294 CA2494294C (en) | 2005-01-25 | 2005-01-25 | Fuel injection nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2494294 CA2494294C (en) | 2005-01-25 | 2005-01-25 | Fuel injection nozzle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2494294A1 CA2494294A1 (en) | 2006-07-25 |
| CA2494294C true CA2494294C (en) | 2008-06-03 |
Family
ID=36702725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2494294 Expired - Fee Related CA2494294C (en) | 2005-01-25 | 2005-01-25 | Fuel injection nozzle |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2494294C (en) |
-
2005
- 2005-01-25 CA CA 2494294 patent/CA2494294C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2494294A1 (en) | 2006-07-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |