WO2001075325A1 - Schraubendruckfeder zur verwendung in einem bauteil eines kraftstoffeinspritzsystems - Google Patents
Schraubendruckfeder zur verwendung in einem bauteil eines kraftstoffeinspritzsystems Download PDFInfo
- Publication number
- WO2001075325A1 WO2001075325A1 PCT/DE2001/001270 DE0101270W WO0175325A1 WO 2001075325 A1 WO2001075325 A1 WO 2001075325A1 DE 0101270 W DE0101270 W DE 0101270W WO 0175325 A1 WO0175325 A1 WO 0175325A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- helical compression
- compression spring
- spring
- wire
- cross
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
- F16F1/04—Wound springs
- F16F1/042—Wound springs characterised by the cross-section of the wire
-
- 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
- F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
Definitions
- Helical compression spring for use in a component of a fuel injection system
- the invention is based on a helical compression spring according to the type of claim 1.
- a helical compression spring is known from DE 195 47 424 AI.
- a helical compression spring is produced by winding and flattened at its ends.
- the helical compression spring is arranged in a component of a fuel injection system and acts on a control part, for example, a valve member in a fuel injection valve.
- a valve member has a pressure surface which is acted upon by the fuel under high pressure and which can be moved against the force of the helical compression spring by the hydraulic force thus generated, as a result of which the valve member controls the fuel injection of the combustion chamber of an internal combustion engine. Since the fuel pressure in the fuel injection valve, as it is used to inject fuel into the combustion chamber of a self-igniting internal combustion engine, is very high at up to 200 MPa, large forces act on the valve member, so that the fuel pressure in the fuel injection valve, as it is used to inject fuel into the combustion chamber of a self-igniting internal
- Helical compression spring must apply a correspondingly large counterforce.
- the fuel injection valve like all other components of the fuel injection system, is to be of compact construction, a helical compression spring is required which has a small winding ratio.
- the round wire used hitherto has the disadvantage that the shear stresses on the inner area of the spring wire of the helical compression spring become relatively large under pressure, which makes it impossible to reduce the diameter of the helical compression spring below a certain value. From the document DE 195 47 102 AI a helical compression spring is known, which is made of a round wire, but the helical compression spring is slightly ground on the outside after winding. This way you can achieve less
- Such a helical compression spring solves the problem of high pressure and the resulting opening pressure drop in fuel injectors, but the mechanical stress distribution on the inner diameter of the spring is unfavorable. To avoid high voltages, care must also be taken not to choose too small a winding ratio.
- the helical compression spring according to the invention with the characterizing features of claim 1 has the advantage that, due to the optimized spring wire cross-section, a compressive preload of the helical compression spring does not, or only insignificantly, decrease due to wear between the wire ends and the subsequent winding and that the helical compression spring has the same external dimensions higher spring forces allowed than a helical compression spring with a circular spring wire cross-section.
- the mutually facing sides of the spring wire are at least approximately parallel surfaces, so that at the ends of the helical compression spring between the wire ends and the subsequent winding of the spring wire a flat system is achieved, the wear and thus a decrease in the opening pressure of the fuel injector is greatly reduced.
- the spring wire of the helical compression spring has a cross section which, starting from a rectangular cross section, is rounded at the corners and whose side forming the inside of the helical compression spring is convexly curved.
- the helical compression spring mainly has shear stresses that do not exceed a maximum on the inside of the helical compression spring. Due to the large forces to which the helical compression spring is exposed, for example in a fuel injection valve, high shear stresses occur in the spring wire, which must not exceed certain maximum values. For this reason, the helical compression spring cannot drop below a certain length for a given opening pressure and opening stroke of the valve member of a fuel injection valve.
- the helical compression spring according to the invention reduces the maximum shear stress, so that greater spring forces can be achieved with the same length.
- this fact can also be used to produce a shorter helical compression spring with unchanged spring forces and the same spring constant, so that the fuel injection valve can be built correspondingly shorter.
- a wire In order to obtain a spring with a cross-section according to the invention, a wire must be used which has a slightly different cross-section, since the cross-section of the spring wire changes during winding to the helical compression spring.
- the side surfaces which face one another after the helical compression spring has been wound are designed to be inclined to one another. As a result of this inclination of the side surfaces, it is advantageously achieved that the side surfaces align at least approximately parallel to one another when the helical compression spring is being twisted and then have the advantages described above, without the need for expensive and time-consuming post-treatment of the helical compression spring after the winch.
- a fuel injection system For example, m High-pressure fuel pumps There are control parts that are moved hydraulically by the fuel pressure against the force of a helical compression spring. Since it is important here - as with all components of the fuel injection system - to be as compact and space-saving as possible, the helical compression spring according to the invention can be used here advantageously.
- FIG. 1 shows a longitudinal section through a fuel injection valve with a helical compression spring according to the invention
- FIG. 2 shows an enlargement of the fuel injection valve shown in FIG. 1 in the region of the spring chamber near the valve member
- Figure 3 shows a cross section through the spring wire of the helical compression spring
- Figure 4 shows a cross section through the spring wire before winding the helical compression spring.
- FIG. 1 shows a longitudinal section through a fuel injection valve 1 as it is used for the injection of
- Fuel is used directly in the combustion chamber of an internal combustion engine, preferably a self-igniting internal combustion engine.
- Em valve holding body 3 is interposed with an intermediate washer 9 by means of a clamping nut 15. braced against a valve body 12 m in the axial direction.
- a bore 17 is formed in the valve body 12, on the end of which a valve seat 24 is formed toward the combustion chamber.
- At least one discharge opening 26 is formed in the valve seat 24, which connects the bore 17 to the combustion chamber.
- a valve member 20 is arranged in the bore 17, which is tapers towards the combustion chamber to form a pressure shoulder 21 and a valve sealing surface 22 merges at the end on the combustion chamber side, which cooperates with the valve seat 24 and thus controls the connection of the injection opening 26 to the bore 17
- a radial expansion of the bore 17 forms a pressure chamber 18, which extends towards the valve seat 24 to surround the valve member 20
- Ring channel continues The pressure chamber 18 is connected to a high-pressure connection 11 via an inlet channel 5, which runs in the valve body 12, the intermediate disk 9 and the valve holding body 3.
- a high-pressure fuel source (not shown in the drawing) can be used to fill fuel under high pressure with the high-pressure connection 11, so that the fuel flows through the inlet channel 5 to m through the pressure chamber 18.
- a fuel filter 7 is arranged in the inlet channel 5 is that filters out suspended matter and dirt particles from the fuel and thus ensures the proper functioning of the fuel spitting valve 1.
- Valve member 20, facing away from the combustion chamber merges with a spring plate 30, which is arranged on intermediate plate 9 and protrudes until a spring chamber 32 formed in valve holding member 3.
- a helical compression spring 40 is arranged in the spring chamber 32 and is arranged under prestress between the spring plate 30 and the end face of the spring chamber 32 facing away from the valve member 20.
- the spring chamber 32 is connected via a drain channel 34 to a fuel drain system, not shown in the drawing. Due to the force of the preload, the helical compression spring 40 presses the valve plate 30 in the direction of the combustion chamber and thus also the valve member 20 with the valve sealing surface 22 against the valve seat 24. This closes the injection opening 26 and no fuel can be drawn from the pressure chamber 18 to the injection opening 26 and from there into the combustion chamber.
- Fuel is introduced under high pressure from the high-pressure fuel source (not shown in the drawing) into the inlet channel 5 and thus also into the pressure chamber 18 via the high-pressure connection 11.
- the high-pressure fuel source not shown in the drawing
- Fuel pressure results in a hydraulic force on the pressure shoulder 21 of the valve member 20, which hydraulic force is directed against the force of the helical compression spring 40. Since the helical compression spring 40 is arranged under prestress in the spring chamber 32, a certain opening pressure is required so that the hydraulic force on the pressure shoulder 21 is greater than the force of the helical compression spring 40.
- this opening pressure is reached in the pressure chamber 18, the valve member 20 moves from the combustion chamber away until it comes to rest on a stop surface formed in the intermediate disk 9.
- the valve sealing surface 22 also lifts off the valve seat 24, and the injection opening 26 is connected to the pressure chamber 18, so that fuel is injected into the combustion chamber of the internal combustion engine. The end of the injection takes place in that no
- FIG. 2 shows an enlargement of the fuel injection valve shown in FIG. 1 in the area of the spring chamber 32 near the combustion chamber
- FIG. 3 shows an enlarged cross section of the spring wire of the helical compression spring 40
- the helical compression spring 40 is characterized, among other things, by the average winding diameter D s .
- the winding diameter D s is defined by the diameter of the helix formed by the center of the circle. This definition is not possible in the present cross-sectional shape of the spring wire, so that the center of gravity S of the spring wire cross-section is used instead of the center of the circle.
- Another characteristic variable is the winding behavior ms w s of the helical compression spring 40. With a circular cross section of the spring wire, this is defined by the quotient of the winding diameter D s and the spring wire diameter.
- winding ratio w s is defined here by the quotient of half the turning diameter D s / 2 and the center of gravity distance a sl des
- the spring constant K characterizes the rigidity of the helical compression spring 40 and is defined by the ratio of the force F acting parallel to the longitudinal axis 48 on the end face of the helical compression spring 40 and the associated change in length 1 of the helical compression spring 40:
- the spring constant K is independent of the acting force F ("Hooke's law") in the case of a resilient deformation and small changes in length 1 and, for a given geometry of the helical compression spring 40, depends only on the material of the spring wire used. Since the fuel metering valve 1, As described above, due to the combustion conditions to be optimized m the internal combustion engine injects with a very high fuel pressure, pressures of up to 200 MPa occur in the fuel injection valve 1. In order to achieve a high opening pressure of the fuel injection valve, the Consequently, helical compression spring 40 must exert a very high spring force F in order to be able to withstand the high hydraulic forces. Depending on the diameter of the valve member, spring constants of approximately 100 to 300 N / mm are therefore necessary.
- the helical compression springs must have a very small winding ratio w s , which is in the range from 2 to 3.
- the A The distance from the inside to the outside of the spring wire is about 2 to 7 mm.
- K metal preferably spring steel, is used as the material for the helical compression spring 40. With significantly lower forces on the helical compression spring 40 and correspondingly smaller spring constants K, it is also possible not to manufacture the helical compression spring 40 from metal, but instead, for example, from a plastic.
- the helical compression spring 40 has a winding height H, which defines st as the distance between the center of gravity S of two successive turns of the spring wire measured in the m direction of the longitudinal axis 48 of the helical compression spring 40.
- the winding height H is at least approximately constant in the central region of the helical compression spring 40. In order to achieve a flat contact surface on the end face of the helical compression spring 40, the winding height H is reduced at the end of the helical compression spring 40 hm until the spring wire on
- the spring wire of the helical compression spring 40 has a cross section which corresponds to a rectangle with rounded corners, the inner surface 46 of which forms the inside of the helical compression spring 40 and is curved outwards.
- the outer surface 44 of the helical compression spring 40 is flattened, so that the helical compression spring 40 has a smaller outer diameter than that of a spring of the same spring constant K and a circular spring wire cross would be the case.
- de helical compression spring 40 requires less space in the valve holding body 1, so that the fuel injection valve can be made somewhat slimmer overall.
- the strong bulge on the inside 46 means that the distance between the inside 46 and the center of area S of the wire is increased.
- the stresses in the area of the inside 46 of the helical compression spring 40 m can advantageously be reduced, which, with the same spring constant K, makes a shorter length of the helical compression spring 40 possible in comparison with a helical compression spring with a circular spring wire cross section.
- the radius of curvature R at the transition from the side surface 42 to the outer surface 44 of the spring wire, as shown in FIG. 3, is approximately 20 to 40% of the distance a between the two side surfaces 42. In contrast to a sharp-edged transition between the side surface 42 and the outer surface 44 an excessive voltage is avoided at this point without the spring constant K noticeably decreasing as a result.
- a spring wire with a specific cross-sectional contour must be wound in accordance with the requirements for the helical compression spring 40.
- Figure 4 the cross section of a corresponding spring wire is shown.
- the cross-sectional area of the spring wire differs from the cross-sectional area of the fully wound helical compression spring 40 shown in FIG. 3, since the spring wire is clearly deformed due to the small winding ratio w ⁇ during the winding process.
- the side surfaces 42 of the spring wire are formed inclined to one another before the helical compression spring 40 is wound. Only results from the winding process and the associated plastic deformation of the spring wire there is a parallelism of the side surfaces 42 and also a flattening of the outer surface 44 of the spring wire.
- the cross-sectional contour of the spring wire before winding the helical compression spring 40 is composed of a large number of circular arc sections, the circular arc sections having different radii and center points.
- five different radii R to R 5 are indicated by arrows, the length of the arrows being the order of magnitude of the ratio of the radii to each other
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuel-Injection Apparatus (AREA)
- Springs (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020017015323A KR20020023221A (ko) | 2000-04-01 | 2001-03-29 | 연료 분사 시스템의 구성 부재에 사용하기 위한 나선형압축 스프링 |
BR0105566-6A BR0105566A (pt) | 2000-04-01 | 2001-03-29 | Mola de pressão helicoidal para a utilização em uma peça construtiva de um sistema de injeção de combustìvel |
JP2001572772A JP2003529722A (ja) | 2000-04-01 | 2001-03-29 | 燃料噴射システムの構成部分内に使用するための圧縮コイルばね |
EP01929303A EP1272773A1 (de) | 2000-04-01 | 2001-03-29 | Schraubendruckfeder zur verwendung in einem bauteil eines kraftstoffeinspritzsystems |
US09/979,731 US6776401B2 (en) | 2000-04-01 | 2001-05-29 | Helical compression spring for use in a component of a fuel injection system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10016425A DE10016425A1 (de) | 2000-04-01 | 2000-04-01 | Schraubendruckfeder zur Verwendung in einem Bauteil eines Kraftstoffeinspritzsystems |
DE10016425.0 | 2000-04-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001075325A1 true WO2001075325A1 (de) | 2001-10-11 |
Family
ID=7637373
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2001/001270 WO2001075325A1 (de) | 2000-04-01 | 2001-03-29 | Schraubendruckfeder zur verwendung in einem bauteil eines kraftstoffeinspritzsystems |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1272773A1 (de) |
JP (1) | JP2003529722A (de) |
KR (1) | KR20020023221A (de) |
BR (1) | BR0105566A (de) |
CZ (1) | CZ20014267A3 (de) |
DE (1) | DE10016425A1 (de) |
WO (1) | WO2001075325A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014220877B3 (de) | 2014-10-15 | 2015-12-03 | Continental Automotive Gmbh | Kraftstoffeinspritzventil |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2157820A (en) * | 1938-03-01 | 1939-05-09 | American Locomotive Co | Bar for helical springs |
US2998242A (en) * | 1959-05-18 | 1961-08-29 | John G Schwarzbeck | Stress equalized coil spring |
DE3701016A1 (de) | 1987-01-15 | 1988-07-28 | Bosch Gmbh Robert | Kraftstoff-einspritzduese fuer brennkraftmaschinen |
DE4306895C1 (de) * | 1993-03-05 | 1994-04-28 | Schwenk Oskar Gmbh & Co Kg | Verfahren zur Herstellung einer Schraubenfeder |
EP0596810A1 (de) * | 1992-11-05 | 1994-05-11 | Allevard | Schraubenfeder, deren Herstellungsverfahren und Draht benutzt für ihre Herstellung |
DE19547102A1 (de) | 1995-12-16 | 1997-06-19 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
DE19547424A1 (de) | 1995-12-19 | 1997-06-26 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
-
2000
- 2000-04-01 DE DE10016425A patent/DE10016425A1/de not_active Withdrawn
-
2001
- 2001-03-29 BR BR0105566-6A patent/BR0105566A/pt not_active IP Right Cessation
- 2001-03-29 KR KR1020017015323A patent/KR20020023221A/ko not_active Application Discontinuation
- 2001-03-29 CZ CZ20014267A patent/CZ20014267A3/cs unknown
- 2001-03-29 EP EP01929303A patent/EP1272773A1/de not_active Withdrawn
- 2001-03-29 WO PCT/DE2001/001270 patent/WO2001075325A1/de not_active Application Discontinuation
- 2001-03-29 JP JP2001572772A patent/JP2003529722A/ja active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2157820A (en) * | 1938-03-01 | 1939-05-09 | American Locomotive Co | Bar for helical springs |
US2998242A (en) * | 1959-05-18 | 1961-08-29 | John G Schwarzbeck | Stress equalized coil spring |
DE3701016A1 (de) | 1987-01-15 | 1988-07-28 | Bosch Gmbh Robert | Kraftstoff-einspritzduese fuer brennkraftmaschinen |
EP0596810A1 (de) * | 1992-11-05 | 1994-05-11 | Allevard | Schraubenfeder, deren Herstellungsverfahren und Draht benutzt für ihre Herstellung |
DE4306895C1 (de) * | 1993-03-05 | 1994-04-28 | Schwenk Oskar Gmbh & Co Kg | Verfahren zur Herstellung einer Schraubenfeder |
DE19547102A1 (de) | 1995-12-16 | 1997-06-19 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
DE19547424A1 (de) | 1995-12-19 | 1997-06-26 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
Also Published As
Publication number | Publication date |
---|---|
EP1272773A1 (de) | 2003-01-08 |
CZ20014267A3 (cs) | 2002-08-14 |
DE10016425A1 (de) | 2001-10-04 |
KR20020023221A (ko) | 2002-03-28 |
JP2003529722A (ja) | 2003-10-07 |
BR0105566A (pt) | 2002-05-21 |
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