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
• • 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
  • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
  • F02M55/008—Arrangement of fuel passages inside of injectors
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
  • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
  • B21C37/15—Making tubes of special shape; Making tube fittings
  • B21C37/28—Making tube fittings for connecting pipes, e.g. U-pieces
  • B21C37/29—Making branched pieces, e.g. T-pieces
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
  • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
  • B21C37/15—Making tubes of special shape; Making tube fittings
  • B21C37/28—Making tube fittings for connecting pipes, e.g. U-pieces
  • B21C37/29—Making branched pieces, e.g. T-pieces
  • B21C37/292—Forming collars by drawing or pushing a rigid forming tool through an opening in the tube wall
• • 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
  • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
  • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
  • F02M55/025—Common rails
• • 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
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/03—Fuel-injection apparatus having means for reducing or avoiding stress, e.g. the stress caused by mechanical force, by fluid pressure or by temperature variations

Definitions

• Component in particular high-pressure part for fuel injection systems, and method for producing such a component
• the invention relates to a component according to the preamble of patent claim 1 and to a method according to the preamble of patent claim 8.
• GB 2 322 919, 2 322 920, 2 322 321 and 2 322 922 and DE 198 relate to the prior art 08 894.A1 called.
• CR injectors Common Rail
• CR Common Rail
• these components in fuel injection systems are not only under very high internal pressure, but moreover the internal pressure is subject to periodic strong fluctuations (so-called swelling internal pressure), high strength requirements must be made accordingly.
• the key factor here is the strength of the intersection of the holes.
• the object of the invention is to further increase the strength of bore intersections in components of the type mentioned against the internal pressure loads that occur.
• the object is achieved with a component of the type mentioned in the physical aspect by the characterizing features of claim 1 and in procedural terms by the characterizing measures of claim 8.
• Disadvantageous refinements of the invention - as far as the part in question is concerned - can be found in patent claims 2 - 7 and - as far as the procedural part of the invention is concerned - patent claims 8 - 15.
• the desired increase in the strength of the component results from the specifically generated residual compressive stresses directly at the most stressed part of the component, the intersection of the holes.
• the increased strength of the component at the extremely stressed points mentioned also results in better material utilization.
• FIG. 1 shows an embodiment of a CR injector, shown in cross section, the component being still undeformed
• FIG. 2 shows the subject of FIG. 1, in cross-sectional representation corresponding to FIG. 1 (section II-II in FIG. 3), after the component has been formed without cutting,
• FIG. 3 the object of FIG. 2, viewed in the direction of arrow "A”, 4 shows a variant of a CR injector, somewhat modified compared to FIGS. 1-3, in a cross-sectional representation corresponding to FIG. 1 or 2, with the component still undeformed,
• FIG. 5 shows the subject of FIG. 4, in a corresponding cross-sectional representation, but after the component has been formed without cutting
• FIG. 6 shows a CR injector according to FIG. 1, in a corresponding cross-sectional representation (section VI - VI in FIG. 7), with the die inserted, and
• FIGS. 1-3 10 denotes an essentially cylindrical component, which is part of the so-called CR injector.
• the component 10 In its prefabricated state shown in FIG. 1, the component 10 has a continuous bore 11 with a circular cross section.
• a second bore 12 of substantially smaller cross-section opens at a right angle to the first bore 11 at 13.
• FIGS. 1 and 2 make it clear that the central axes 14, 15 of the two intersecting bores 11, 12 do not meet in the center of the component 10.
• the second bore 12 thus opens eccentrically into the first bore 11.
• FIG. 2 shows that the - in the partially machined state according to FIG. 1 still circular - first bore 11 has a flattening 16 in the area of intersection 13 of the two bores 11, 12.
• the flattening 16 is deliberately intended consequence of a non-cutting shaping of the component 10 caused by pressurization from outside (in the direction of the arrow 17) by means of a rectangular stamp 18 (see FIG. 1).
• FIGS. 2 and 3 there is a groove-shaped deformation 19 on the outer circumference of the component 10, which, however, like the flattening 16 produced by the pressurization, only affects the area of the second bore 12 or its intersection point 13 limited with the first bore 11.
• FIGS. 4 and 5 and numbered 10 a there is constructed very similarly to the component 10 according to FIGS. 1-3.
• the component 10 a in its processed state has a non-continuous starting bore 20 which is directed towards the intersection 13 of the two bores 11, 12.
• a stamp 22 is inserted into the start bore 20 and subjected to force in the direction of the arrow 23.
• the stamp 22 can have a circular or oval cross section.
• a special feature of the variant according to FIGS. 6 and 7 is that in the through bore 11 of the component 10 - which otherwise corresponds to the embodiment according to FIG. 1 - a die, designated overall by 24, is inserted.
• the die 24 consists of two essentially horizontally divided "halves" 25, 26 which, when joined together, result in a circular cross section of the die 24, which corresponds to the cross section of the bore 11.
• the upper half 26 of the die 24 has a trough-shaped depression 27 at the intersection 13 of the two bores 11, 12.
• the material of the component 10 deforms in accordance with the aforementioned Shape of the die recess 27 and into it so that (only) at the intersection 13 of the two bores 11, 12 there is a corresponding local flattening of the bore 11.
• the die 24 and trough-shaped recess 27 support the shaping of the flattening and thus the creation of the desired residual compressive stresses in the material area of the intersection 13.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• General Engineering & Computer Science (AREA)
• Fuel-Injection Apparatus (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=7635049

Family Applications (1)

Country Status (8)

Families Citing this family (11)

Family Cites Families (10)

• 2000
  • 2000-03-16 DE DE10012961A patent/DE10012961A1/de not_active Withdrawn
• 2001
  • 2001-02-22 US US09/980,507 patent/US6634335B2/en not_active Expired - Fee Related
  • 2001-02-22 CZ CZ20014107A patent/CZ20014107A3/cs unknown
  • 2001-02-22 JP JP2001567929A patent/JP2003527531A/ja active Pending
  • 2001-02-22 RU RU2001133351/06A patent/RU2001133351A/ru not_active Application Discontinuation
  • 2001-02-22 KR KR1020017014436A patent/KR20020023219A/ko not_active Application Discontinuation
  • 2001-02-22 EP EP01915031A patent/EP1190172A1/de not_active Withdrawn
  • 2001-02-22 WO PCT/DE2001/000676 patent/WO2001069074A1/de not_active Application Discontinuation

Non-Patent Citations (1)

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