EP3798441A1 - Pompe à carburant haute pression - Google Patents

Pompe à carburant haute pression Download PDF

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Publication number
EP3798441A1
EP3798441A1 EP20193577.2A EP20193577A EP3798441A1 EP 3798441 A1 EP3798441 A1 EP 3798441A1 EP 20193577 A EP20193577 A EP 20193577A EP 3798441 A1 EP3798441 A1 EP 3798441A1
Authority
EP
European Patent Office
Prior art keywords
contact surface
pressure fuel
fuel pump
fastening
hole
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.)
Granted
Application number
EP20193577.2A
Other languages
German (de)
English (en)
Other versions
EP3798441B1 (fr
Inventor
Shigenobu Shimazu
Sid Nuansirikomon
Padipat Pluemworasawat
Bunpoth Vanasirisawut
Soeren Stritzel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3798441A1 publication Critical patent/EP3798441A1/fr
Application granted granted Critical
Publication of EP3798441B1 publication Critical patent/EP3798441B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/48—Assembling; Disassembling; Replacing

Definitions

  • the invention relates to a high-pressure fuel pump for a fuel injection system of an internal combustion engine according to the preamble of claim 1.
  • the DE 10 2008 042 626 A1 discloses a high-pressure fuel pump with a fastening flange which has two diametrically opposed tab-like or wing-like fastening sections, in each of which there is a through hole for a fastening screw to pass through.
  • the high-pressure fuel pump can be attached to an engine block of an internal combustion engine.
  • material is displaced on the outer edge of a fastening section by a punching process, whereby a first contact surface for contacting the engine block is provided on a first side and a second contact surface for contacting a screw head is provided on a second side of the fastening flange.
  • the high-pressure fuel pump can also be fastened to those engine blocks on which only a small surface is available for fastening the fastening flange.
  • the first contact surface which is provided for contacting and supporting the fastening flange on the engine block, can be moved closer than before to the through hole, which is used to pass the fastening screw.
  • care can be taken to leave a certain, small gap between the Through hole and the first contact surface remains so that the through hole is not damaged by the material displacement and the fastening screw remains straight after tightening.
  • the interruption or recess section is provided on the first side, which leads to the formation of an additional section of the second contact surface that is complementary to the interruption or recess section on the second side (It goes without saying that here and below the term "screw head" also includes a possible washer or the like).
  • a high-pressure fuel pump with a fastening flange for fastening the high-pressure fuel pump to an engine block of an internal combustion engine is proposed.
  • the fastening flange is usually a flat, plate-like part with two wing-like fastening sections arranged diametrically opposite one another.
  • the fastening flange has at least one through hole (preferably two through holes, namely one in each fastening section) for passing a fastening screw through in each case.
  • the generally flat plate-like fastening flange In the installed position, has a first side pointing towards the engine block and a second side pointing away from the engine block in the installed position.
  • a slightly protruding first contact surface is formed on the first side of the fastening flange, which is used for defined contact with and support on the engine block.
  • a second contact surface that is complementary to this in regions is also formed on the second side, which serves for contacting a screw head of the fastening screw so that the screw head is supported on the fastening flange.
  • the first contact surface is seen in the circumferential direction around the through hole through at least one interruption or recess section interrupted or left out.
  • this interruption or recess section no (this also includes only a comparatively small) material displacement has taken place.
  • the interruption or recess section with no or only slight material displacement is at least partially surrounded by a section in which the said (greater) material displacement has taken place.
  • the at least one interruption or recess section referred to here is not present in the area of the fastening flange facing a housing of the high pressure fuel pump, as seen from the through hole, but in an outer area, seen from the through hole, rather remote from the housing of the high pressure fuel pump Viewed in the circumferential direction, a maximum sector extending over approximately 270 ° around the through hole. This forms an additional section of the second contact surface on the second side, on which the screw head of the fastening screw can be supported.
  • the first contact surface is essentially immediately adjacent to the through hole, at least in regions. This enables the high-pressure fuel pump to be attached to a very small engine block.
  • “essentially” means that just such a large distance can remain between the first contact surface and the edge of the through hole that the through hole is not deformed when the material is displaced.
  • the additional section of the second contact surface be immediately adjacent to the through hole, at least in some areas. This ensures reliable support for the screw head, in particular also when the screw head has a comparatively small diameter.
  • the first contact surface has a first edge region and a second edge region towards the through hole, the first edge region being closer to the through hole than the second edge region. This is the case that corresponds more to a recess section than to an interruption section.
  • At least one interruption or recess section lie on a longitudinal axis of the fastening flange.
  • the fastening flange usually has an elongated shape by which a longitudinal axis is defined, with two fastening sections protruding in the manner of a wing or tab, each with a through hole. Because the interruption or recess section lies on this longitudinal axis, a symmetrical configuration of the first contact surface and the second contact surface is made possible. This measure prevents the fastening flange from twisting when it is fastened to the engine block (i.e. when the fastening screws are tightened) and the high-pressure fuel pump is not misaligned as a result.
  • the first contact surface is delimited radially outward from the edge of the fastening flange. This has the effect of maximizing the first contact area, since the first contact area extends all the way to the outer edge of the fastening flange.
  • the material displacement is at least also brought about by a punching process.
  • a punching process can be carried out with high precision and at low cost.
  • a high pressure fuel pump carries in Figure 1 generally the reference numeral 10. It comprises a pump housing 12 with a polygonal cross section and overall approximately rotationally symmetrical.
  • the high-pressure fuel pump 10 is a so-called “plug-in pump”. She will be with an in Figure 1 lower region 14 inserted into an opening in a cylinder head of an engine block of an internal combustion engine (not shown).
  • the lower region 14 includes, inter alia, a piston 16 and a piston spring 18.
  • the piston 16 is set in a reciprocating motion by an eccentric section of an eccentric shaft or a cam section of a camshaft.
  • a fastening flange 20 is used to fasten the high-pressure fuel pump 10 to the engine block of the internal combustion engine and will be discussed in greater detail below.
  • the high-pressure fuel pump 10 comprises an inlet 22 and an outlet 24.
  • the inlet 22 is connected to a fuel line (not shown) via which the high-pressure fuel pump 10 receives precompressed fuel.
  • the outlet 24 of the high-pressure fuel pump 10 is connected to a high-pressure fuel reservoir (not shown), which is usually also referred to as a “rail”.
  • Several injectors are in turn connected to these, which inject the fuel directly into the combustion chambers of the internal combustion engine. Both petrol and diesel can be used as fuel.
  • the mounting flange 20 is shown in greater detail in FIGS Figures 2 and 3 drawn.
  • the mounting flange 20 has an overall oval-appearing shape of an elongated diamond with rounded corners and a longitudinal axis 26.
  • a central area 28 is defined from which two diametrically opposed and protruding wing-like mounting sections 30a and 30b are defined extend.
  • the middle area 28 is penetrated by a central fastening opening 32, which is designed in a step-like manner.
  • the pump housing 12 is inserted into this fastening opening 32. An area of contact between the The fastening opening 32 and the pump housing 12 are welded, as a result of which the fastening flange 20 is rigidly and integrally connected to the pump housing 12.
  • Each fastening section 30a and 30b has a through hole 34a and 34b lying on the longitudinal axis 26.
  • the fastening sections 30a and 30b are identical and constructed and configured symmetrically to one another. For the sake of simplicity, only the fastening section 30a will be discussed below.
  • the fastening flange 20 is designed as an overall flat and overall essentially flat plate-like part which has a thickness D.
  • the Figure 2 shows the mounting flange from the side that points towards the engine block in the installation position. This page is referred to as the "first page” and bears the reference numeral 36.
  • the Figure 3 shows the mounting flange 20 from the side that is facing away from the engine block in the installed position. This side is referred to as the “second side” and bears the reference number 38.
  • the fastening section 30a of the fastening flange 20 has on the first side 36 a first contact surface 40 for contacting the engine block, which is formed by a material displacement, for example a stamping process or an embossing process.
  • the fastening section 30a of the fastening flange 20 has a second contact surface 42 which is complementary to the first contact surface 40 and also formed by the displacement of material and which is used for contacting a screw head 44 (or an associated washer) of a fastening screw 46.
  • the first contact surface 40 viewed in the circumferential direction around the through hole 34a, is interrupted by at least one interruption section 48 in which no or at least a substantial material displacement has taken place.
  • an additional section 50 of the second contact surface 42 is formed on the second side 38, on which the screw head 44 of the fastening screw 46 can be supported.
  • the first contact surface 40 in the circumferential direction around the Through hole 34a seen, divided into two annular segment-shaped segments or sectors 40a and 40b.
  • the interruption section 48 is not present in a region 52 of the fastening flange 20 facing the pump housing 12 of the high-pressure fuel pump 10, but in an outer region 52 of the fastening flange 20, seen from the through hole 34a, from the fastening opening 32 and from
  • the pump housing 12 of the high-pressure fuel pump 10 is more remote and, viewed in the circumferential direction, extends over approximately 220 ° (maximum approximately 270 °) around the through hole 34a.
  • the first contact surface 40 is delimited radially outward from the edge (without reference number) of the fastening flange 20.
  • FIG 4 a modified embodiment of a fastening flange 20 is shown. This differs from that of the Figures 1-3 in that, instead of an interruption section, only a recess section 54 is provided, through which the first contact surface 40 is not divided into two separate segments or sectors 40a and 40b. Rather, the two sectors 40a and 40b remain connected to one another by a radially outer web 56.
  • the first contact surface 40 has a first edge region 58 and a second edge region 60 towards the through hole 34a, the first edge region 58 being closer to the through hole 34a than the second edge region 60 Screw head 44 of the fastening screw 46 provides a sufficiently large second contact surface 42.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP20193577.2A 2019-09-25 2020-08-31 Pompe à carburant haute pression Active EP3798441B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019214661.9A DE102019214661A1 (de) 2019-09-25 2019-09-25 Kraftstoff-Hochdruckpumpe

Publications (2)

Publication Number Publication Date
EP3798441A1 true EP3798441A1 (fr) 2021-03-31
EP3798441B1 EP3798441B1 (fr) 2022-08-17

Family

ID=72292337

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20193577.2A Active EP3798441B1 (fr) 2019-09-25 2020-08-31 Pompe à carburant haute pression

Country Status (2)

Country Link
EP (1) EP3798441B1 (fr)
DE (1) DE102019214661A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230036743A (ko) 2021-09-08 2023-03-15 주식회사 현대케피코 다중 면 접촉식 고압펌프 마운팅 장치

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008042626A1 (de) 2008-05-29 2009-12-03 Robert Bosch Gmbh Hochdruck-Kraftstoffpumpe
DE102015210795A1 (de) * 2015-06-12 2016-12-15 Continental Automotive Gmbh Kraftstoffhochdruckpumpe

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008042626A1 (de) 2008-05-29 2009-12-03 Robert Bosch Gmbh Hochdruck-Kraftstoffpumpe
DE102015210795A1 (de) * 2015-06-12 2016-12-15 Continental Automotive Gmbh Kraftstoffhochdruckpumpe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230036743A (ko) 2021-09-08 2023-03-15 주식회사 현대케피코 다중 면 접촉식 고압펌프 마운팅 장치
KR102604769B1 (ko) 2021-09-08 2023-11-21 주식회사 현대케피코 다중 면 접촉식 고압펌프 마운팅 장치

Also Published As

Publication number Publication date
DE102019214661A1 (de) 2021-03-25
EP3798441B1 (fr) 2022-08-17

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