WO2022167290A1 - Soupape d'aspiration pour une pompe à haute pression pour l'alimentation en carburant d'un moteur à combustion interne et pompe comprenant une telle soupape - Google Patents

Soupape d'aspiration pour une pompe à haute pression pour l'alimentation en carburant d'un moteur à combustion interne et pompe comprenant une telle soupape Download PDF

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Publication number
WO2022167290A1
WO2022167290A1 PCT/EP2022/051768 EP2022051768W WO2022167290A1 WO 2022167290 A1 WO2022167290 A1 WO 2022167290A1 EP 2022051768 W EP2022051768 W EP 2022051768W WO 2022167290 A1 WO2022167290 A1 WO 2022167290A1
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WO
WIPO (PCT)
Prior art keywords
valve
shutter
suction
valve body
axis
Prior art date
Application number
PCT/EP2022/051768
Other languages
English (en)
Inventor
Alessandro Di Monte
Luigi Fiorentino
Benedetto Loiacono
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 WO2022167290A1 publication Critical patent/WO2022167290A1/fr

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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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/043—Arrangements for driving reciprocating piston-type pumps
    • 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
    • F02M59/46—Valves
    • F02M59/464—Inlet valves of the check valve type
    • 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
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • F02M63/0035—Poppet valves, i.e. having a mushroom-shaped valve member that moves perpendicularly to the plane of the valve seat
    • 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
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0077—Valve seat details
    • 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
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member

Definitions

  • the technical field of the present invention relates to pumps for supplying fuel, preferably diesel oil, to an internal combustion engine.
  • the technical field of the present invention relates to a specific form of high pressure pump, namely a pump comprising at least one pump piston cyclically suppled with fuel through an intake valve made in the form of a movable shutter configured to be coupled cyclically in sealing manner to a corresponding valve body.
  • the present invention will tackle the problem of how to optimize the geometry of the sealing surface of the shutter.
  • a piston pump comprises a pump body configured to receive a head in which at least one cylinder is formed for housing a corresponding pump piston.
  • Each piston comprises a first end that is mostly inside the pump body, and is known as the “foot” of the piston, and a second, opposite end known as the “head” of the piston.
  • the foot of the piston is coupled to a camshaft (or to another drive device).
  • each piston is kept pressed against the shaft by a suitable pre-loaded spring.
  • each piston performs a suction stroke, in which it draws fuel into the cylinder at the piston head, and a compression stroke, in which it compresses the fuel that was made to enter the cylinder in the preceding suction stroke.
  • the cylinder is usually supplied through a first conduit located near the outer surface of the head, while the compressed fuel is discharged along a second conduit. The part of the cylinder where the piston head acts and where compression takes place is called the compression chamber.
  • valves are present, and are placed along the fuel supply and discharge conduits.
  • the fuel Before entering the cylinder, the fuel is fed into a suction chamber that is outside the head and is in communication with the compression chamber via a valve called the suction valve.
  • the delivery valve is associated with the conduit for delivery to the engine, and controls the flow directed towards a common manifold having a plurality of injectors which, in turn, are connected to the engine.
  • the suction chamber is delimited by a cap fixed in a sealing manner against the outer surface of the head near the suction valve.
  • the suction valve comprises a shutter member which is movable with respect to a valve body, which may be made in one piece with the head (or may simply be the upper portion of the cylinder), or may be made as a separate cylindrical body that is held in a sealing manner against the outer surface of the head.
  • the valve body provides a guide axis for a stem portion of the shutter member, which, on opposite sides of the valve body, comprises a first end that projects into the suction chamber and a second end, which is shutter-shaped or mushroomshaped, and which projects into the compression chamber.
  • the main object of the present invention is therefore to provide an innovative suction valve for a high pressure pump configured for feeding fuel to an internal combustion engine.
  • the high pressure pump of the present invention comprises a pump piston housed in a cylinder formed in a head.
  • the suction valve is configured for selectively opening and closing a channel that connects the suction chamber (outside the cylinder) and the compression chamber (inside the cylinder).
  • a suction valve designed for this purpose therefore comprises: a) a shutter member (substantially of the mushroom-shaped type) comprising a cylindrical stem having a first (cylindrical) end and a second end provided with a shutter (a portion that is enlarged with respect to the stem); b) a valve body of cylindrical shape, extending between the suction chamber and the compression chamber, a through hole being formed in this valve body for slidably housing the stem of the shutter member.
  • the dimensions of the hole in the valve body and those of the actuating member are such that, when the valve is assembled, the first end of the shutter member (the cylindrical end without a shutter) projects from one side of the valve body into the suction chamber.
  • this cylindrical end is coupled to a plate (which is interference fitted, for example) and acts as a support for a spring acting between said plate and a first outer surface of the valve body.
  • This spring has the purpose of forcing the valve into a closed condition and setting an opening pressure threshold.
  • the stem of the shutter member comprises an enlarged end, known as the shutter, which projects beyond the valve body and is intended to be located in the compression chamber when in use.
  • This shutter is usually circular in plan view (that is to say, when viewed along the axis of the stem) and comprises a lower surface that is substantially flat and orthogonal to the axis of the stem.
  • the shutter comprises a sealing surface configured for selectively bearing in a sealing manner against a second outer surface of the valve body (in other words, the surface of the valve body facing the compression chamber).
  • “sealing surface” is taken to mean at least the surface part of the shutter that is configured for making contact with the valve body in the closing phases.
  • the hole in the valve body that houses the stem comprises an enlarged portion upstream of the aforesaid second outer surface, so as to provide a distribution chamber inside the valve body, supplied with fuel leaving the suction chamber.
  • This distribution chamber is, in particular, supplied by at least one channel (radial, for example) formed in the valve body.
  • the stem is movable along the hole in the valve body between a first position, in which the shutter bears against the aforesaid second outer surface of the valve body (and in which the fuel is therefore unable to pass from the distribution chamber to the compression chamber), and a second position, in which the shutter does not bear against the aforesaid second outer surface of the valve body (and in which, therefore, a channel is present for the free passage of fuel from the distribution chamber to the compression chamber).
  • the dynamics of the opening and closing of the suction valve will not be described further, as they are known to those skilled in the art, and therefore do not constitute a specific and innovative object of the present invention.
  • the object of the present invention is to improve the sealing coupling between the sealing surface of the shutter and the second outer surface of the valve body, in which this second outer surface of the valve body is a truncated conical surface.
  • This truncated conical form is known, and has a first inner edge at the outlet from the distribution chamber into the compression chamber and a second outer edge (that is to say, an edge farther from the valve axis), said second edge being at a greater depth in the compression chamber.
  • the sealing surface is no longer conical or spherical, but is a surface that can prevent local peaks of contact pressure, not only when the component is new but also when it is in a worn condition.
  • the sealing surface 21 exhibits what may be defined as a “double radius” form, comprising:
  • the lateral portions of the sealing surface namely the spherical portions defined by a second radius of curvature R’, progressively exhibit a distance (calculated along the shutter axis) that gradually increases with respect to the development that the surface with a single radius of curvature R would have.
  • This greater distance from the edges creates two different advantages. The first is the fact that, even in a worn condition, the edges do not come into contact with the shutter, or do so only after a longer life of the component. In the absence of such contact, other local contact pressures are not created; the component is therefore preserved.
  • the second advantage is the smaller negative effect that the cavitation phenomenon may have on the component. This is because the presence of a greater volume between the valve body and the shutter reduces this undesirable phenomenon.
  • the length of the sealing surface in the present invention is reduced with respect to the known solution with a spherical surface.
  • This reduced sealing length helps to reduce the concentration of vapour in this area, and thus helps to mitigate the aforesaid cavitation phenomenon.
  • the terms “central portion” and “lateral portion” are used above to facilitate the understanding of the invention in relation to the contact points of the coupling and with reference to the attached drawings.
  • the sealing surface is actually a surface with circular symmetry centred on the shutter axis, in other words a toroidal surface centred on the shutter axis.
  • the sealing surface of the present invention may be defined as:
  • the centre of the circular generatrix defining the central portion is on the axis A’ below the shutter, while the centres of the circular generatrices defining the lateral portions are located within the shutter.
  • the present innovative solution both ensures an optimal seal and enables the useful duration of the life of the valve to be increased safely.
  • the contact surface is centred on the conical surface of the valve body, and has a distance from the edges at its ends such that, even in a worn condition, there is no local contact at these edges.
  • it is the contact with such edges, particularly the inner edge, that generates a very high local pressure, resulting in greater local deformation and wear of the sealing surface in the prior art.
  • the present invention also relates to a high-pressure pump for supplying fuel to an internal combustion engine, wherein this pump comprises a valve with a sealing surface as claimed in the attached claims.
  • This high pressure pump comprises a head in which at least one cylinder is formed, in which a corresponding pump piston slides.
  • the valve body of the suction valve may be an independent component coupled in a sealing manner to the head, or may be a portion (a single piece) of the head itself.
  • FIG. 1 is a schematic sectional view of a portion of an example of a high pressure piston pump that may be provided with a suction valve according to the present invention
  • - Figure 2 is a schematic view of a suction valve according to a first example of the prior art
  • FIGS. 5a-5c show schematic views of a suction valve according to a second example of the prior art
  • FIG. 8 shows an example of a suction valve according to the present invention
  • Figure 1 shows a schematic sectional view of a part of a high pressure pump that may be provided with a suction valve according to the present invention.
  • a high pressure pump may form part of a pump assembly (not shown) configured to supply fuel from a tank to an internal combustion engine.
  • the high pressure pump 1 of Figure 1 is a pump with pump pistons (Figure 1 shows a single piston), and is configured to supply fuel from a tank to an internal combustion engine (neither of these are shown). Between the tank and the high pressure pump, the pump assembly may also comprise a low pressure pump, for example a gear pump (not shown) configured for supplying the fuel from the tank to the high pressure pump. In a known way, the high pressure pump 1 and the low pressure pump may be driven by a common drive (such as a camshaft (not shown)).
  • the high pressure pump 1 comprises a pump body (not shown) coupled to a head 2. At least one cylinder 3 has been formed in the head 2, this cylinder extending along an axis Al and housing a pump piston (not shown).
  • the piston is coupled slidably to the cylinder 3.
  • the suction chamber 5 is in communication with the cylinder 3 via a suction valve 6.
  • the upper portion of the cylinder 3 between the head of the piston and the suction valve 6 is called the compression chamber and, in its turn, is in communication with a delivery conduit 7 formed inside the head 2.
  • This delivery conduit 7 is provided with a delivery valve 8 for controlling the flow of fuel towards the internal combustion engine.
  • the suction valve 6 comprises a shutter member 9 housed in a through hole in the head 2 formed along the axis Al of the cylinder.
  • This portion of the head 2 housing the shutter member 9 is known as the valve body 10, and may not necessarily be made in one piece with the head 2.
  • the motion of the pump piston is driven by a drive device (usually a camshaft, not shown in the attached figures).
  • a drive device usually a camshaft, not shown in the attached figures.
  • the piston slides along the cylinder 3 with a reciprocating rectilinear motion including a stroke for the suction of fuel into the cylinder 3 and a stroke for the compression of the fuel contained in the cylinder 3, for compressing the fuel that has been sucked in.
  • the suction chamber 5 is defined by a cap 11, coupled to the head and positioned at the opposite end of the valve 6 from the pump piston.
  • the cap 11 comprises a cover and a ring nut that fixes the cover to the head 2.
  • the shutter member 9 shown in Figure 1 is substantially of the mushroom-shaped type and comprises a cylindrical stem 12 having a first (cylindrical) end 13 and a second end 14 provided with a shutter 15 (a portion enlarged with respect to the stem).
  • the valve body 10 is of cylindrical shape and extends between the suction chamber and the compression chamber. A through hole being formed in this valve body for slidably housing the stem 12 of the shutter member 9. Where the valve body 10 is concerned, this component has not undergone any modification from those currently in use.
  • the valve body 10 comprises a hole 16 housing the stem 12.
  • the dimensions of the hole 16 in the valve body 10 and those of the actuating member 9 are such that, when the valve 6 is assembled, the first end 13 of the shutter member 9 (the cylindrical end without a shutter) projects from one side of the valve body 10 into the suction chamber 5 (obviously, when the valve is assembled in the corresponding pump).
  • this cylindrical end 13 is coupled to a plate 17 (which is interference fitted, for example) for supporting a spring 18 between said plate 17 and a first outer surface of the valve body 10.
  • This spring 18 has the purpose of generating an elastic force configured for forcing the closure of the valve and for setting a minimum opening pressure.
  • the stem 12 of the shutter member 9 comprises an enlarged end, known as the shutter 15, which projects beyond the valve body 10 and is intended to be located in the compression chamber 19 of the pump when in use.
  • This shutter 15 preferably circular in plan view (that is to say, when viewed along the axis of the stem Al) and comprises a lower surface 20 that is substantially flat and orthogonal to the axis of the stem.
  • the shutter 15 comprises a sealing surface 21 configured for selectively bearing in a sealing manner against a second outer surface 22 of the valve body 10 (in other words, the surface of the valve body 10 facing the compression chamber 19).
  • “sealing surface” 21 is taken to mean at least the surface part of the shutter 15 that is configured for making contact with the valve body 10 when the suction valve 6 shuts off the supply of fuel into the compression chamber 19.
  • the hole 16 in the valve body 10 that houses the stem 12 comprises an enlarged portion upstream of the aforesaid second outer surface 22 of the valve body 10, so as to provide a distribution chamber 23 inside the valve body 10, supplied with fuel leaving the suction chamber 5.
  • This distribution chamber 23 is, in particular, supplied by at least one channel 24 (radial, for example) formed in the valve body 10.
  • the stem 12 is movable along the hole 16 in the valve body 10 between a first position, in which the shutter 15 bears against the aforesaid second outer surface 22 of the valve body 10 (and in which the fuel is therefore unable to pass from the distribution chamber 23 to the compression chamber 9), and a second position, in which the shutter 15 does not bear against the aforesaid second outer surface 22 of the valve body 10 (and in which, therefore, a channel is present for the free passage of fuel from the distribution chamber 23 to the compression chamber 19).
  • the dynamics of the opening and closing of the suction valve 6 will not be described further, as they are known and do not constitute an object of the present invention.
  • the object of the present invention is to improve the sealing coupling between the sealing surface 21 of the shutter 15 and the second outer surface 22 of the valve body 10, particularly when this surface is a truncated conical surface.
  • This truncated conical form is known, and has a first inner edge 25 at the outlet from the distribution chamber 23 into the compression chamber 19 and a second outer edge 26 (that is to say, an edge farther from the valve axis), said second edge being 26 at a greater depth in the compression chamber 19.
  • the valve body 10 is made in one piece with the head 2, and therefore there is no interruption with the rest of the cylinder 3 beyond the edge 26.
  • this figure shows a schematic view of a suction valve according to a first example of the prior art.
  • the truncated conical surface 22 is delimited by the first inner edge 25 and the second outer edge 26.
  • the coupling between the sealing surface 21’ and the truncated conical surface 22 is substantially reduced to the single inner edge 25, since the sealing surface 21’ also exhibits a truncated conical form.
  • this coupling is referred to as a “sealing cone”.
  • Figure 3a shows an enlargement of the configuration of Figure 2 in a non-worn coupling condition
  • Figure 3b shows the variation of the contact pressure in such a coupling. Because there is substantially a single theoretical point of contact, the pressure reaches a peak at the edge 25 and then falls rapidly along the sealing surface 21’ until it disappears (exponentially) halfway along its length.
  • Figure 4a shows an enlargement of the configuration of Figure 2 in a worn coupling condition. Because of the high localized pressure at the edge 25, local deformation occurs on the conical sealing surface 21’, exactly at the position of the inner edge 25. Evidently, this deformation shortens the service life of the valve.
  • Figure 5a shows a schematic view of a suction valve according to a second example of the prior art.
  • Figure 5B shows that the radius of the sphere defining the spherical geometry of the sealing surface 21” is greater than both the radius of the shutter 15 and the radius of the cylinder 3.
  • Figure 5c shows that the area of coupling is substantially centred on the truncated conical surface 22 and greatly extended, so that it practically reaches the edges 25 and 26.
  • Figure 6a shows an enlargement of the configuration of Figure 5c in a non-worn coupling condition
  • Figure 6b shows the variation of the contact pressure in such a coupling. Since there is a wide contact area, there are no points of peak pressure, and in fact the pressure exhibits a parabolic variation and disappears at the points of detachment near the edges 25 and 26.
  • Figure 7a shows an enlargement of the configuration of Figure 5c in a worn coupling condition.
  • the coupling area extends until it also includes the edges 25 and 26 which were outside the original contact area.
  • two peaks develop at these edges and, as in the preceding case, cause a deformation of the shutter and a consequent shortening of the service life of this component.
  • this figure shows a schematic view of a suction valve according to an example of embodiment of the present invention.
  • the truncated conical surface 22 is delimited by the first inner edge 25 and the second inner edge 26, the coupling between the sealing surface 21 and the truncated conical surface 22 is not restricted to a point as in the preceding example, nor does it involve the edges (even in a worn condition) as in the second example of the prior art described.
  • the sealing surface 21 exhibits what may be defined as a “double radius” form, comprising:
  • a spherical central portion defined by a first radius of curvature R, which could be the spherical radius R of the prior art example of Figures 5-7;
  • the form that the surface 21 would have if it were spherical with a single radius R is shown in broken lines in Figure 8.
  • Figure 9a shows the configuration of Figure 8 in a non-worn coupling condition
  • Figure 9b shows the variation of the contact pressure in such a coupling.
  • the pressure exhibits a parabolic variation which disappears at the points of detachment, which are distant from the edges 25 and 26.
  • Figure 10a shows an enlargement of the configuration of Figure 8 in a worn coupling condition. Because of the geometry with a double radius of curvature, even in conditions of wear the coupling area does not extend to include the edges 25 and 26. In the absence of contact at the edges, as may be seen in Figure 10, there are no pressure peaks. In the absence of pressure peaks, the deformation of the shutter is limited and not restricted to a point, thus lengthening the service life of this component.
  • the present invention provides a second advantage.
  • the greater distance (along the shutter axis) between the edges of the valve body and the sealing surface 21 mitigates what is known as the cavitation phenomenon, well known to those skilled in the art, which also contributes to a shortening of the life of the component.
  • Figures 11A and 11B provide a comparison between the spherical solution according to the prior art (11A) and the solution of the present invention. It should also be noted that, owing to the effect of the radii R’, the length of the sealing surface in the present invention is reduced by comparison with the length D of Figure 11. This smaller sealing length helps to reduce the concentration of vapour in this area, and thus helps to mitigate the aforesaid cavitation phenomenon.

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

Abstract

L'invention concerne une soupape d'aspiration pour une pompe à haute pression destinée à fournir du carburant à un moteur à combustion interne, la soupape d'aspiration comprenant un élément obturateur mobile comprenant une tige cylindrique présentant une première extrémité et une seconde extrémité dotée d'un obturateur, et un corps de soupape dans lequel un trou traversant est formé afin de recevoir la tige de l'élément obturateur, et la première extrémité de l'élément obturateur faisant saillie à partir d'un côté du corps de soupape et étant accouplée par l'intermédiaire d'un ressort à une première surface externe du corps de soupape faisant face à la chambre d'aspiration, l'obturateur faisant saillie depuis le côté opposé du corps de soupape et comprenant une surface d'étanchéité configurée pour supporter sélectivement d'une manière étanche une seconde surface externe du corps de soupape faisant face à la chambre de compression, la seconde surface externe du corps de soupape étant une surface conique tronquée et la surface d'étanchéité étant une surface toroïdale formée par des génératrices circulaires présentant des rayons différents.
PCT/EP2022/051768 2021-02-05 2022-01-26 Soupape d'aspiration pour une pompe à haute pression pour l'alimentation en carburant d'un moteur à combustion interne et pompe comprenant une telle soupape WO2022167290A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102021000002639A IT202100002639A1 (it) 2021-02-05 2021-02-05 Valvola di aspirazione per una pompa di alta pressione di alimentazione di carburante ad un motore a combustione interna e pompa comprendente tale valvola
IT102021000002639 2021-02-05

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WO2022167290A1 true WO2022167290A1 (fr) 2022-08-11

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WO (1) WO2022167290A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116861593A (zh) * 2023-07-12 2023-10-10 安徽新沪屏蔽泵有限责任公司 一种泵的吸入室外形建模方法和吸入室

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20120243A1 (it) * 2012-02-17 2013-08-18 Bosch Gmbh Robert Valvola di aspirazione e gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna
DE102013210957A1 (de) * 2013-06-12 2014-12-18 Robert Bosch Gmbh Steuerbares Saugventil für eine Hochdruckpumpe
WO2020156778A1 (fr) * 2019-01-31 2020-08-06 Robert Bosch Gmbh Soupape d'admission pour pompe haute pression destinée à acheminer du carburant vers un moteur à combustion interne et pompe comportant une telle soupape

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20120243A1 (it) * 2012-02-17 2013-08-18 Bosch Gmbh Robert Valvola di aspirazione e gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna
DE102013210957A1 (de) * 2013-06-12 2014-12-18 Robert Bosch Gmbh Steuerbares Saugventil für eine Hochdruckpumpe
WO2020156778A1 (fr) * 2019-01-31 2020-08-06 Robert Bosch Gmbh Soupape d'admission pour pompe haute pression destinée à acheminer du carburant vers un moteur à combustion interne et pompe comportant une telle soupape

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116861593A (zh) * 2023-07-12 2023-10-10 安徽新沪屏蔽泵有限责任公司 一种泵的吸入室外形建模方法和吸入室
CN116861593B (zh) * 2023-07-12 2023-12-19 安徽新沪屏蔽泵有限责任公司 一种泵的吸入室外形建模方法和吸入室

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