WO2002016759A1 - Fuel injection valve for internal combustion engines - Google Patents
Fuel injection valve for internal combustion engines Download PDFInfo
- Publication number
- WO2002016759A1 WO2002016759A1 PCT/DE2001/002759 DE0102759W WO0216759A1 WO 2002016759 A1 WO2002016759 A1 WO 2002016759A1 DE 0102759 W DE0102759 W DE 0102759W WO 0216759 A1 WO0216759 A1 WO 0216759A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- spring
- compression spring
- chamber
- fuel injection
- valve
- Prior art date
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
- F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
Definitions
- the invention is based on a fuel injection valve for internal combustion engines according to the preamble of claim 1.
- a fuel injection valve for example from the document DE 44 08 245 AI and comprises a valve holding body in which a spring chamber is formed.
- a compression spring is arranged under prestress, which is supported at one end on a stationary stop and comes to rest on a spring plate at the other end.
- the spring plate is connected to a valve member which is piston-shaped and is arranged to be longitudinally displaceable in a bore.
- the longitudinal movement of the valve member controls at least one injection opening, via which fuel can be injected into the combustion chamber of an internal combustion engine.
- the valve member has at least one pressure surface, which is arranged in a pressure chamber that can be filled with fuel under high pressure.
- the known fuel injection valve has the disadvantage that the opening pressure decreases over the service life of the fuel injection valve and does not remain constant as desired. Due to the vibrations of the internal combustion engine during operation and thus also of the fuel injection valve, the position of the compression spring in the spring chamber changes, and this results in a slightly different spring force and thus also a different opening pressure, depending on the position of the compression spring. In addition, the end faces of the compression spring twist slightly against each other when pressed together, so that there is wear on the contact surface of the compression spring on the spring plate or on the stationary stop, as a result of which the pretension of the compression spring is reduced and the opening pressure of the fuel injector thus decreases.
- the fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage that the compression spring jams itself in the spring chamber and so the opening pressure of the fuel injection valve remains largely constant.
- the compression spring is ground on at least one end so that the normal of this surface encloses an angle with the longitudinal axis of the compression spring. When the compression spring is preloaded in the spring chamber, this results in a force acting on the compression spring in the radial direction, which at the end presses it against the wall of the spring chamber, thereby preventing rotation of the compression spring in the spring chamber or any other change in position.
- both contact surfaces of the compression spring are ground parallel to one another. This results in a radial force on the compression spring at both ends, which caulks it in the spring chamber. Since there is no preferred direction in the longitudinal direction, installation is also unproblematic.
- the spring chamber is designed as a bore and has a diameter which allows the compression spring to be arranged at an angle in the spring chamber.
- Figure 1 shows a longitudinal section through a fuel injection valve according to the invention
- Figure 2 shows an enlarged view of Figure 1 in the area of the spring chamber
- Figure 3 shows a longitudinal section through a compression spring according to the invention before installation.
- FIG. 1 shows a longitudinal section through a fuel injection valve according to the invention.
- a valve body 1 is interposed by an washer 3 by means of a Clamping nut 7 clamped against a valve holding body 5 in the axial direction.
- the fuel injection valve is arranged in an internal combustion engine such that the free end of the valve body 1 extends into the combustion chamber of the internal combustion engine.
- a bore 10 is formed in the valve body 1, in which a piston-shaped valve member 12 is arranged to be longitudinally displaceable.
- the valve member 12 is guided in a section in the bore 10 facing away from the combustion chamber, tapers towards the combustion chamber to form a pressure shoulder 19 and merges at the end on the combustion chamber side into a valve sealing surface 22 which at least has a valve seat 20 for control purposes which is formed on the end of the bore 10 on the combustion chamber side an injection opening 24 cooperates.
- a pressure chamber 15 is formed in the valve body 1 by a radial expansion of the bore 10, which surrounds the pressure shoulder 19 and which continues as an annular channel surrounding the valve member 12 up to the valve seat 20.
- the pressure chamber 15 can be filled with fuel under high pressure via an inlet channel 17 running in the valve body 1, the intermediate disk 3 and the valve holding body 5.
- the valve member 12 merges into a spring plate 27 which is arranged in the intermediate disk 3 and extends into a spring chamber 30 formed in the valve holding body 5.
- the spring chamber 30 is designed as a bore which is aligned coaxially with the bore 10 in the valve body 1 and has a longitudinal axis 31.
- the spring chamber 30 is connected at its end remote from the combustion chamber to an outlet channel 18 which is connected to a leakage oil system, not shown in the drawing.
- a compression spring 32 is arranged under prestress, which is designed here as a helical compression spring and whose end face 42 facing the combustion chamber comes to rest on the spring plate 27, while its end face 41 facing away from the combustion chamber comes to rest on the end face facing away from the combustion chamber of the spring chamber 30 comes to rest.
- a compensating disk 36 is arranged between the end face 41 of the compression spring 32 facing away from the combustion chamber and the end face of the spring chamber 30 facing away from the combustion chamber, and the thickness of the prestress of the compression spring 32 can be adjusted.
- the mode of operation of the fuel injection valve is such that fuel is introduced under high pressure from a fuel high-pressure source (not shown in the drawing) into the pressure chamber 15 via the inlet channel 17. There, the pressure rises until the hydraulic force acting on the pressure shoulder 19 in the axial direction on the valve member 12 is greater than the force of the compression spring 32.
- the valve member 12 then lifts with the valve sealing surface 22 from the valve seat 20, so that the pressure chamber 15 is connected to the injection openings 24 and fuel is injected into the combustion chamber of the internal combustion engine.
- the spring plate 27 is also moved, so that a direction of movement 39 is thereby defined, which in the present exemplary embodiment coincides with the longitudinal axis 31 of the spring chamber.
- FIG. 2 shows an enlargement of Figure 1 in the area of the spring chamber 30 and the compression spring 32 in the installed position.
- FIG. 3 shows the compression spring 32 before installation in the spring chamber 30.
- the compression spring 32 has a longitudinal axis 34.
- the end face 41 of the compression spring 32 facing the combustion chamber like the end face 42 facing the combustion chamber, has a surface normal 35 which forms an angle ⁇ with the longitudinal axis 34 of the compression spring 32.
- the angle ⁇ is less than 5 degrees, preferably 0.5 to 3.0 degrees. This results in an inclined position of the compression spring 32 in the spring chamber 30 in the installed position, so that the longitudinal axis 34 of the compression spring 32 encloses the angle with the longitudinal axis 31 of the spring chamber 30.
- the angle ⁇ causes an overhang e of the compression spring 32, so that the diameter of the spring chamber 30 corresponds at least approximately to the diameter of the compression spring 32 plus the overhang e.
- the arrangement of the compression spring 32 under prestress in the spring chamber 30 results in a force acting in the radial direction on the ends of the compression spring 32 which presses the compression spring 32 against the wall of the spring chamber 30. This jamming of the compression spring 32 in the spring chamber 30 prevents rotation of the compression spring 32 about its axis during operation of the fuel injection valve.
- the compression spring 32 is compressed by the opening stroke movement of the valve member 12, the end faces 41 and 42 are also slightly rotated relative to one another, but the compression also increases the radial force with which the compression spring 32 is clamped in the spring chamber 30. With a suitable design of the compression spring 32, it is thus ensured that mechanical vibrations, such as occur during operation of the internal combustion engine, machine occur, rotation of the compression spring 32 or another change in position within the spring chamber 30 is prevented.
- the compression spring 32 shown in the drawing provision can also be made to provide the compression spring 32 with a bevel angle 1 only on one end face (41; 42).
- the technical effort is less in this case, since two end faces (41; 42) do not have to be ground parallel to one another.
- the resulting radial force on the compression spring 32 only acts on one side in this case, which - depending on the embodiment of the fuel injection valve - can be sufficient to fix the compression spring 32.
- the spring wire of the compression spring 32 can also have a meandering arrangement.
- the compression spring 32 according to the invention in another device in which a constant force is to be exerted on a movable element and it is disadvantageous if the compression spring is movable in the corresponding spring chamber.
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
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01956358A EP1313943A1 (en) | 2000-08-24 | 2001-07-20 | Fuel injection valve for internal combustion engines |
BR0107139-4A BR0107139A (en) | 2000-08-24 | 2001-07-20 | Fuel injection valve for combustion engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2000141675 DE10041675A1 (en) | 2000-08-24 | 2000-08-24 | Fuel injection valve for internal combustion engines |
DE10041675.6 | 2000-08-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002016759A1 true WO2002016759A1 (en) | 2002-02-28 |
Family
ID=7653692
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2001/002759 WO2002016759A1 (en) | 2000-08-24 | 2001-07-20 | Fuel injection valve for internal combustion engines |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1313943A1 (en) |
CN (1) | CN1388865A (en) |
BR (1) | BR0107139A (en) |
DE (1) | DE10041675A1 (en) |
WO (1) | WO2002016759A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4655396A (en) * | 1985-09-25 | 1987-04-07 | United Technologies Diesel Systems, Inc. | Electromagnetic fuel injector |
US4660770A (en) * | 1985-09-25 | 1987-04-28 | United Technologies Diesel Systems, Inc. | Electromagnetic fuel injector |
GB2226078A (en) * | 1988-11-09 | 1990-06-20 | Lucas Ind Plc | C.i. engine fuel injection nozzle |
EP0583139A1 (en) * | 1992-08-14 | 1994-02-16 | LUCAS INDUSTRIES public limited company | Fuel injector |
DE4408245A1 (en) | 1994-03-11 | 1995-09-14 | Bosch Gmbh Robert | Injection nozzle for internal combustion engines |
EP0867611A1 (en) * | 1997-03-26 | 1998-09-30 | Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 | Fuel injection nozzle for an internal combustion engine |
-
2000
- 2000-08-24 DE DE2000141675 patent/DE10041675A1/en not_active Withdrawn
-
2001
- 2001-07-20 EP EP01956358A patent/EP1313943A1/en not_active Withdrawn
- 2001-07-20 CN CN 01802521 patent/CN1388865A/en active Pending
- 2001-07-20 WO PCT/DE2001/002759 patent/WO2002016759A1/en not_active Application Discontinuation
- 2001-07-20 BR BR0107139-4A patent/BR0107139A/en not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4655396A (en) * | 1985-09-25 | 1987-04-07 | United Technologies Diesel Systems, Inc. | Electromagnetic fuel injector |
US4660770A (en) * | 1985-09-25 | 1987-04-28 | United Technologies Diesel Systems, Inc. | Electromagnetic fuel injector |
GB2226078A (en) * | 1988-11-09 | 1990-06-20 | Lucas Ind Plc | C.i. engine fuel injection nozzle |
EP0583139A1 (en) * | 1992-08-14 | 1994-02-16 | LUCAS INDUSTRIES public limited company | Fuel injector |
DE4408245A1 (en) | 1994-03-11 | 1995-09-14 | Bosch Gmbh Robert | Injection nozzle for internal combustion engines |
EP0867611A1 (en) * | 1997-03-26 | 1998-09-30 | Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 | Fuel injection nozzle for an internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
EP1313943A1 (en) | 2003-05-28 |
CN1388865A (en) | 2003-01-01 |
DE10041675A1 (en) | 2002-03-07 |
BR0107139A (en) | 2002-07-02 |
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