EP4211346A1 - Kraftstoff-hochdruckpumpe - Google Patents
Kraftstoff-hochdruckpumpeInfo
- Publication number
- EP4211346A1 EP4211346A1 EP21769699.6A EP21769699A EP4211346A1 EP 4211346 A1 EP4211346 A1 EP 4211346A1 EP 21769699 A EP21769699 A EP 21769699A EP 4211346 A1 EP4211346 A1 EP 4211346A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- pressure fuel
- retaining ring
- fuel pump
- section
- 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.)
- Pending
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 55
- 239000002184 metal Substances 0.000 claims abstract description 8
- 238000002485 combustion reaction Methods 0.000 claims abstract description 3
- 239000012528 membrane Substances 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
-
- 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 is based on a high-pressure fuel pump that has a pump housing in which a pressure damper is arranged, as is known, for example, from WO2018054628 A1.
- the pressure damper is fixed between a pump body and a pump cover by two approximately ring-shaped components.
- the invention is based on the desire to simplify the known device and its manufacture in an expedient manner. According to the invention, it is provided that the damper box is braced against the pump cover on the one hand and against the pump body on the other hand by at least two retaining ring springs that are identical in construction to one another.
- a retaining ring spring is understood to mean, in particular, a structure with an at least essentially ring-shaped shape, which is intended to hold a damper box formed from two metal membranes welded together at their edges against the pump cover on the one hand and against the pump body on the other hand and, due to a certain spring effect inherent in it, also in able to brace the axial direction.
- the retaining ring springs also have an elasticity or spring effect in the radial direction, by means of which they can be clamped, for example, in the pump body or in the pump cover and thus, for example, during the manufacture of the high-pressure fuel pump before the final completion of the fuel - High-pressure pump can be pre-assembled.
- retaining ring springs being open at a position along their circumference, for example over a range of 5° or 10° of the angle of circumference or the like.
- each retaining ring spring has a profile in radial cross section which consists of a rounded connecting section and two legs protruding from the connecting section in the same radial direction.
- the legs can be moved towards one another by a force in the axial direction, which acts in the region of the legs, which in turn results in a spring-back reaction of the retaining ring spring in the axial direction.
- the rounded connecting section is arranged radially on the outside of the retaining ring spring and rests against the pump body or the pump cover in the radial direction. This ensures that the retaining ring spring lies flat against the pump body or the pump cover and the required forces acting in the radial direction can act reliably and reproducibly between the retaining ring spring and the pump cover or pump body.
- each of the legs has a first section and a second section, with the first section being arranged between the second section and the connecting section.
- the two first sections of a retaining ring spring can be arranged radially on the inside and on opposite axial sides, as viewed from the connection section. It can advantageously be provided that the first two sections are conically shaped. The retaining ring spring then continuously increases in height or potential spring deflection towards the inside in the area of the first sections.
- the two second sections of a retaining ring spring lie in planes parallel to one another in the state in which no forces are acting on the retaining ring spring and/or that in the state in which the retaining ring spring is braced against the damper box, the two second sections with their Pointing radially inward ends in the axial direction results in that between the first and second portions of a leg a rounded abutment portion is formed, which is located beyond the first and second portion in the axial direction as viewed from the connecting portion. It is in particular this contact section via which the retaining ring springs rest against the components that are axially adjacent to them.
- the two retaining ring springs each rest with a contact section on the edge of a metal membrane of the damper box and or that the retaining ring spring arranged towards the pump body rests with its contact surface arranged towards the pump body on the pump body. In this way, a flat and reproducible contact between the adjacent components is achieved.
- two or more retaining ring springs can already be arranged between the damper box and the pump cover. These then preferably also come into contact with one another via their contact surfaces.
- two or more retaining ring springs can also already be arranged between the damper box and the pump housing. These then also preferably come into contact with one another via their contact surfaces Investment.
- Such variants are particularly preferred for pump covers that are relatively high and/or that have, for example, a fuel connection on their radial outside.
- the retaining ring spring arranged towards the pump cover bears against the pump cover with the first section of its leg pointing towards the pump cover, in particular flatly. In this way, a safe and reproducible system is created.
- the retaining ring spring has through holes through the first sections. In this way, the entire damper chamber can be traversed and pressure equalization is possible without restrictions in the entire damper chamber.
- each retaining ring spring is essentially rotationally symmetrical about its longitudinal axis.
- Substantially rotationally symmetrical means in particular that the retaining ring spring can also be open at one position along its circumference and that in particular it should not be ruled out that the retaining ring spring can have through holes through the first sections, which represent breaks in the rotational symmetry in the strict mathematical sense.
- each retaining ring spring is essentially play-symmetrical to a plane that is perpendicular to its longitudinal axis.
- Substantially game-symmetrical includes minor symmetry breaks, for example due to different or deviating arrangement of through-holes in particular.
- Figure 1 shows a known high-pressure fuel pump in an overall view
- FIG. 2 shows a partial view of a high-pressure fuel pump modified according to a first exemplary embodiment according to the invention
- FIG. 3 shows an enlarged detail from FIG. 3
- FIG. 4 shows a partial view of a high-pressure fuel pump modified according to a second exemplary embodiment according to the invention.
- a high-pressure fuel pump for an internal combustion engine bears the reference numeral 10.
- the high-pressure fuel pump 10 has an essentially cylindrical pump housing 12, in or on which the essential components of the high-pressure fuel pump 10 are arranged.
- the high-pressure fuel pump 10 has an inlet/quantity control valve 14 , a delivery piston 18 arranged in a delivery chamber 16 and capable of reciprocating movement by a drive shaft (not shown), an outlet valve 20 and a pressure-limiting valve 22 .
- first duct 24 which extends coaxially to the delivery chamber 16 and to the delivery piston 18 and which leads from the delivery chamber 16 to a second duct 26 formed by a recess which is at an angle of 90° to the first duct 24 is arranged and in which the pressure relief valve 22 is accommodated.
- a longitudinal axis of the pump housing 12 bears the reference numeral 28 overall in Figure 1, a longitudinal axis or longitudinal direction of the pressure-limiting valve 22 the Reference numeral 29.
- a pressure damper 30 is arranged in the pump housing 12, between the pump cover 12b on the one hand and the pump body 12b.
- the delivery piston 18 draws fuel into the delivery chamber 16 via the inlet and quantity control valve 14 during an intake stroke.
- the fuel in delivery chamber 16 is compressed and ejected via outlet valve 20, for example, into a high-pressure region 32, for example to a fuel collection line (“rail”), where the fuel is stored under high pressure.
- the high-pressure area 32 is connected to the high-pressure fuel pump 10 via an outlet connection 34 .
- the amount of fuel that is ejected during a delivery stroke is set by the electromagnetically actuated inlet and quantity control valve 14 .
- the pressure-limiting valve 22 opens, as a result of which fuel can flow from the high-pressure area into the pumping chamber 16 .
- FIGS. 2 and 3 show an example of a modification of the pump shown in FIG. 1 according to the invention.
- 2 shows the upper section of the pump housing 12, namely the upper section of the pump body 12a and the pump cover 12b fixed on it.
- FIG. 3 shows an enlarged view of the detail marked III in FIG. 2, the profile of the retaining ring spring 30b, 30c in a detailed radial cross section.
- the profile is shown dark in the state installed in the high-pressure fuel pump as in FIG. This is clearly contrasted in FIG. 3 with the profile of the retaining ring spring 30b, 30c in the relaxed state, in which no forces act on the retaining ring spring 30b, 30c.
- a pressure damper 30 is arranged between the pump body 12a and the pump cover 12b. It comprises a damper box 30a, which consists of two metal membranes 73 welded together at their edges along a circumferential weld seam 93, and two identical retaining ring springs 30b, 30c, which brace the damper box 30a against the pump cover 12b on the one hand and against the pump body 12a on the other.
- the retaining ring springs 30b, 30c have a profile which consists of a rounded connecting section 85 and two legs 84, 86 projecting radially inwards from the connecting section.
- the legs 84 , 86 each have a first section 83 , 87 and a second section 81 , 89 , with the first section 83 , 87 being arranged between the second section 81 , 89 and the connecting section 85 .
- the two first sections 83, 87 of a retaining ring spring 30b, 30c are arranged radially inwards and on opposite axial sides, viewed from the connecting section 85—above and below the connecting section 85 in the figures.
- the two first sections 83, 87 have a conical shape, so that they appear as straight sections in the cross sections shown in the figures.
- Through bores 90 are provided through the first sections 83, 87, so that the damper chamber 72 can be flowed through overall or pressure equalization within the damper chamber 72 can be produced.
- the retaining ring spring 30b arranged towards the pump cover 12b bears flat against the pump cover 12b with the first section 87 of its leg 86 pointing towards the pump cover 12b.
- each retaining ring spring 30b, 30c in the state in which no forces are acting on the retaining ring spring 30b, 30c lie in mutually parallel planes, in particular perpendicular to the longitudinal axis 28.
- the legs 84, 86 are light and elastic on one another to be deformed according to the elasticity of the retainer ring springs 30b, 30c in the axial direction. Furthermore, between the first 83, 87 and the second sections 81, 89 of a leg 84, 86 there is a rounded one Contact section 82, 88 is formed, which is arranged beyond the first 83, 87 and the second section 81, 89 as seen from the connecting section 85 in the axial direction.
- the two retaining ring springs 30b, 30c each rest with a contact section 82, 88 on the edge of a metal membrane 73 of the damper box 30a, in particular on the circumferential weld 93 on the edge of the metal membranes 73.
- the retaining ring spring 30b, 30c arranged towards the pump body 12a rests with its contact surface 82 arranged towards the pump body 12a on the pump body 12a.
- FIG. 4 shows an alternative embodiment of the invention.
- the damper box 30a is braced against the pump cover 12b on the one hand and against the pump body 12a on the other by more than two retaining ring springs 30b, 30b', 30c, 30c', 30c'' which are structurally identical to one another.
- five retaining ring springs 30b, 30b', 30c, 30c', 30c'' are accommodated in the pump cover 12b, two above and three below the damper box 30a.
- the retaining ring springs 30b, 30b′, 30c, 30c′, 30c′′ are open in this example at a position 7 along their circumference, so that they have elasticity in the radial direction, i.e. in the radial direction in the examples in the pump cover 12b or 12b alternatively can be clamped in the pump body 12a.
- a comparatively high pump cover 12b is realized.
- a fluid connection 91 for example an inlet for a fuel such as gasoline, is implemented on its radial outer surface.
- a filter 92 is housed inside the inlet.
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
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020211324.6A DE102020211324A1 (de) | 2020-09-09 | 2020-09-09 | Kraftstoff-Hochdruckpumpe |
PCT/EP2021/073642 WO2022053328A1 (de) | 2020-09-09 | 2021-08-26 | Kraftstoff-hochdruckpumpe |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4211346A1 true EP4211346A1 (de) | 2023-07-19 |
Family
ID=77739066
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21769699.6A Pending EP4211346A1 (de) | 2020-09-09 | 2021-08-26 | Kraftstoff-hochdruckpumpe |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP4211346A1 (de) |
CN (1) | CN116075633A (de) |
BR (1) | BR112023004109A2 (de) |
DE (1) | DE102020211324A1 (de) |
WO (1) | WO2022053328A1 (de) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004002489B4 (de) * | 2004-01-17 | 2013-01-31 | Robert Bosch Gmbh | Fluidpumpe, insbesondere Kraftstoff-Hochdruckpumpe |
US9109593B2 (en) * | 2011-08-23 | 2015-08-18 | Denso Corporation | High pressure pump |
DE102015214812B4 (de) * | 2015-08-04 | 2020-01-23 | Continental Automotive Gmbh | Kraftstoffhochdruckpumpe |
DE102016218215A1 (de) | 2016-09-22 | 2018-03-22 | Robert Bosch Gmbh | Kraftstoff-Hochdruckpumpe |
-
2020
- 2020-09-09 DE DE102020211324.6A patent/DE102020211324A1/de active Pending
-
2021
- 2021-08-26 EP EP21769699.6A patent/EP4211346A1/de active Pending
- 2021-08-26 CN CN202180055076.2A patent/CN116075633A/zh active Pending
- 2021-08-26 BR BR112023004109A patent/BR112023004109A2/pt unknown
- 2021-08-26 WO PCT/EP2021/073642 patent/WO2022053328A1/de active Application Filing
Also Published As
Publication number | Publication date |
---|---|
WO2022053328A1 (de) | 2022-03-17 |
BR112023004109A2 (pt) | 2023-04-04 |
CN116075633A (zh) | 2023-05-05 |
DE102020211324A1 (de) | 2022-03-10 |
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