WO2019007776A1 - Pump assembly for supplying fuel, preferably diesel, to an internal combustion engine - Google Patents

Pump assembly for supplying fuel, preferably diesel, to an internal combustion engine Download PDF

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Publication number
WO2019007776A1
WO2019007776A1 PCT/EP2018/067241 EP2018067241W WO2019007776A1 WO 2019007776 A1 WO2019007776 A1 WO 2019007776A1 EP 2018067241 W EP2018067241 W EP 2018067241W WO 2019007776 A1 WO2019007776 A1 WO 2019007776A1
Authority
WO
WIPO (PCT)
Prior art keywords
shut
pump assembly
cylinder
diameter
assembly according
Prior art date
Application number
PCT/EP2018/067241
Other languages
French (fr)
Inventor
Fabio DAMIANI
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
Priority to JP2019569919A priority Critical patent/JP2020524238A/en
Publication of WO2019007776A1 publication Critical patent/WO2019007776A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/102—Disc valves
    • F04B53/1022—Disc valves having means for guiding the closure member axially
    • 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
    • F02M63/0054—Check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0452—Distribution members, e.g. valves

Definitions

  • the present invention relates to a pump assembly for supplying fuel, preferably diesel, to an internal combustion engine.
  • the present invention relates to a pump assembly comprising a high-pressure pump for supplying fuel to an internal combustion engine; and a pre-supply pump for supplying the fuel from a container tank to the high-pressure pump.
  • the high-pressure pump is a pump with pistons comprising a pump body; at least one cylinder made in the pump body; and a piston engaged slidingly in said cylinder.
  • the piston can move along the cylinder with an alternating rectilinear movement comprising an intake stroke for taking fuel into the cylinder and a compression stroke for compressing the fuel contained in said cylinder.
  • the supply of fuel by the pre-supply pump to the cylinder is controlled by an intake valve, and the supply of fuel from the cylinder to the internal combustion engine is controlled by a delivery valve.
  • the intake valve comprises a valve body mounted inside the pump body; a shut- off member engaged slidingly through the valve body to move between an open position and a closed position of the cylinder; a disc fitted on the shut-off member; and a spring interposed between the valve body and the disc so as to move the shut-off member into its closed position, and normally keep it there.
  • the disc and the shut-off member have respective coupling portions of cylindrical shape coupled together by interference.
  • the aim of the present invention is to provide a pump assembly for supplying fuel, preferably diesel, to an internal combustion engine that does not have the above drawbacks and that may be implemented simply and economically.
  • a pump assembly for supplying fuel, preferably diesel, to an internal combustion engine is provided as claimed in the attached claims.
  • FIGS. 1 and 2 are two schematic views in section, with parts cut away for clarity, of a preferred embodiment of the pump assembly of the present invention.
  • Figure 3 is a schematic view in section, on an enlarged scale and with parts cut away for clarity, of a detail of Figures 1 and 2.
  • reference sign 1 indicates, as a whole, a pump assembly for supplying fuel, preferably diesel, from a container tank (not shown) to an internal combustion engine (not shown), in this case a diesel internal combustion engine.
  • the pump assembly 1 comprises a high-pressure pump 2 for supplying the fuel to the internal combustion engine (not shown), and a low-pressure or pre-supply pump 3 for supplying the fuel from the container tank (not shown) to the pump 2.
  • the high-pressure pump 2 is a pump with pistons having a pump body 4 comprising a container housing 5, which has a central bore 6 with a longitudinal axis 7, and which further has at least one lateral bore 8 (usually a plurality of bores 8 distributed uniformly about the axis 7) with a longitudinal axis 9 that is transverse to the axis 7 and extends radially towards the outside of the housing 5 from said bore 6.
  • Each bore 8 is closed off by a cylinder head 10, which is in contact with the housing 5 and has a protuberance 11 projecting into the bore 8 coaxially to the axis 9.
  • the cylinder head 10 has a central bore 12, made through the cylinder head 10 coaxially to the axis 9, and comprising a wider portion 13 and a narrower portion 14 aligned with one another along said axis 9.
  • the portion 14 is on the side towards the bore 6, and defines a cylinder 15 of the pump 2 engaged slidingly by a piston 16 that can move, pushed by an actuator device 17, with an alternating rectilinear movement comprising an intake stroke for taking in the fuel into the cylinder 15 and a compression stroke for compressing the fuel contained inside said cylinder 15.
  • the device 17 comprises a tubular sleeve 18, which is engaged slidingly inside the bore 8 coaxially to the axis 9, extends around the cylinder 15, and has an internal annular flange 19 that projects radially from an internal surface of the sleeve 18 and splits said sleeve 18 into two cylindrical portions 20, 21, of which the portion 20 is on the side towards the bore 6.
  • the device 17 further comprises a cam follower 22 comprising a coupling block 23 of substantially cylindrical shape, which is blocked by interference inside the portion 20, and is in contact with the flange 19, and bears a cam follower roll 24.
  • the roll 24 projects from the block 23 towards the bore 6, and is coupled rotationally to the block 23 so as to rotate, with respect to said block 23, about its own longitudinal axis 25 which is substantially perpendicular to the axis 9.
  • the flange 19 bears an annular disc 26, which extends around the piston 16, is inserted inside the portion 21 of the sleeve 18 coaxially to the axis 9, and has an outer peripheral edge axially on the side towards the flange 19 and an inner peripheral edge axially on the side towards a head of said piston 16.
  • the device 17 further comprises a compression spring 27, which is mounted between the protuberance 11 and the sleeve 18 coaxially to the axis 9, and is interposed between the cylinder head 10 and the disc 26 so as to move, and normally keep, the disc 26 in contact with the flange 19 and the roll 24 in contact with a cam 28 formed on an external surface of an intermediate portion of a transmission shaft 29 mounted through the bore 6 so as to rotate, with respect to the housing 5, about the axis 7.
  • a compression spring 27 which is mounted between the protuberance 11 and the sleeve 18 coaxially to the axis 9, and is interposed between the cylinder head 10 and the disc 26 so as to move, and normally keep, the disc 26 in contact with the flange 19 and the roll 24 in contact with a cam 28 formed on an external surface of an intermediate portion of a transmission shaft 29 mounted through the bore 6 so as to rotate, with respect to the housing 5, about the axis 7.
  • the supply of fuel into each cylinder 15 is selectively controlled by an associated intake valve 30 of known type, while the supply of fuel from each cylinder 15 to the internal combustion engine (not shown) is selectively controlled by an associated delivery valve 31 of known type.
  • the intake valve 30 comprises a valve body 32 blocked axially inside the portion 13 by a cover 33 screwed into the cylinder head 10, and a shut-off member 34 of elongate shape, which is mounted coaxially to the axis 9, and is engaged slidingly through the valve body 32 so as to move parallel to the axis 9 between a closed position and an open position of the cylinder 15.
  • the shut-off member 34 is moved into its closed position, and normally kept there, by a spring 35 interposed between the valve body 32 and a disc 36, which is fitted on the shut-off member 34 transversely to the axis 9, and is coupled by interference with said shut-off member 34.
  • the shut-off member 34 comprises a coupling portion 37 of cylindrical shape extending inside the disc 36.
  • the disc 36 has a central bore 38, which is delimited axially by two end planes E that are perpendicular to the axis 9, and is further delimited by an internal wall 39 extending around said axis 9.
  • the bore 38 has, in an initial configuration thereof (not shown), prior to coupling with the shut-off member 34, a variable diameter with the largest diameter at the planes E and the smallest diameter at an intermediate plane I that is parallel to said planes E.
  • the wall 39 has a shape domed towards the axis 9.
  • the portion 37 of the shut-off member 34 has a diameter smaller than the diameter of the bore 38 at the planes E and a diameter larger than the diameter of the bore 38 at the plane I.
  • the bore 38 has the same diameter at the planes E; the plane I is a median plane of the disc 36 equidistant from the planes E; and the diameter of the bore 38 varies continuously from each plane E to the plane I.
  • the bore 38 has, in a final configuration thereof ( Figure 3), following the coupling with the shut-off member 34, a central section 40 of cylindrical shape, and two end sections 41 arranged on either side of the section 40 along the axis 9.
  • Each section 41 has a diameter that increases from the section 40 to the relative plane E in such a way that, at the planes E, the wall 39 is not in contact with the shut-off member 34.
  • the bore 38 is coupled by interference with the shut-off member 34 only at the section 40, and has a diameter larger than the diameter of the portion 37 along the sections 41. Since, at the planes E, the shut-off member 34 and the disc 36 are not in contact with one another, the contact pressures at the planes E are relatively low and the shut-off member 34 has a relatively good lifetime and resistance to wear.

Landscapes

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

Abstract

The supply of fuel to a cylinder (15) of a pump assembly is controlled by an intake valve (30) having a shut-off member (34), a disc (36) coupled by interference with the shut-off member (34), and a spring (35) engaged on the disc (36) so as to move the shut-off member (34) into a closed position of the cylinder (15); the disc (36) being coupled by interference with the shut-off member (34) only at a central section (40) thereof, and further having two end sections (41) with a diameter larger than the diameter of the shut-off member (34).

Description

Description
Title
PUMP ASSEMBLY FOR SUPPLYING FU EL, PREFERABLY DI ESEL, TO AN INTERNAL COMBUSTION ENGINE
The present invention relates to a pump assembly for supplying fuel, preferably diesel, to an internal combustion engine.
More specifically, the present invention relates to a pump assembly comprising a high-pressure pump for supplying fuel to an internal combustion engine; and a pre-supply pump for supplying the fuel from a container tank to the high-pressure pump.
The high-pressure pump is a pump with pistons comprising a pump body; at least one cylinder made in the pump body; and a piston engaged slidingly in said cylinder.
The piston can move along the cylinder with an alternating rectilinear movement comprising an intake stroke for taking fuel into the cylinder and a compression stroke for compressing the fuel contained in said cylinder. The supply of fuel by the pre-supply pump to the cylinder is controlled by an intake valve, and the supply of fuel from the cylinder to the internal combustion engine is controlled by a delivery valve.
The intake valve comprises a valve body mounted inside the pump body; a shut- off member engaged slidingly through the valve body to move between an open position and a closed position of the cylinder; a disc fitted on the shut-off member; and a spring interposed between the valve body and the disc so as to move the shut-off member into its closed position, and normally keep it there.
The disc and the shut-off member have respective coupling portions of cylindrical shape coupled together by interference.
Known pump assemblies of the type described above have a number of drawbacks, mainly due to the fact that the movement of the shut-off member into its open position causes the disc to impact against the valve body and the movement of the shut-off member into its closed position causes the shut-off member to impact against said valve body.
The impacts of the disc and the shut-off member against the valve body cause flexion of the shut-off member, a relative movement between the shut-off member and the disc and, therefore, a relatively high contact pressure at the ends of the coupling portions. Consequently, the shut-off member is subject to friction wear and its fatigue strength and lifetime are thus relatively poor. The aim of the present invention is to provide a pump assembly for supplying fuel, preferably diesel, to an internal combustion engine that does not have the above drawbacks and that may be implemented simply and economically.
According to the present invention, a pump assembly for supplying fuel, preferably diesel, to an internal combustion engine is provided as claimed in the attached claims.
The present invention will now be described with reference to the attached drawings, which illustrate a non-limiting embodiment thereof, in which:
Figures 1 and 2 are two schematic views in section, with parts cut away for clarity, of a preferred embodiment of the pump assembly of the present invention; and
Figure 3 is a schematic view in section, on an enlarged scale and with parts cut away for clarity, of a detail of Figures 1 and 2.
With reference to Figures 1 and 2, reference sign 1 indicates, as a whole, a pump assembly for supplying fuel, preferably diesel, from a container tank (not shown) to an internal combustion engine (not shown), in this case a diesel internal combustion engine. The pump assembly 1 comprises a high-pressure pump 2 for supplying the fuel to the internal combustion engine (not shown), and a low-pressure or pre-supply pump 3 for supplying the fuel from the container tank (not shown) to the pump 2. The high-pressure pump 2 is a pump with pistons having a pump body 4 comprising a container housing 5, which has a central bore 6 with a longitudinal axis 7, and which further has at least one lateral bore 8 (usually a plurality of bores 8 distributed uniformly about the axis 7) with a longitudinal axis 9 that is transverse to the axis 7 and extends radially towards the outside of the housing 5 from said bore 6.
Each bore 8 is closed off by a cylinder head 10, which is in contact with the housing 5 and has a protuberance 11 projecting into the bore 8 coaxially to the axis 9.
The cylinder head 10 has a central bore 12, made through the cylinder head 10 coaxially to the axis 9, and comprising a wider portion 13 and a narrower portion 14 aligned with one another along said axis 9. The portion 14 is on the side towards the bore 6, and defines a cylinder 15 of the pump 2 engaged slidingly by a piston 16 that can move, pushed by an actuator device 17, with an alternating rectilinear movement comprising an intake stroke for taking in the fuel into the cylinder 15 and a compression stroke for compressing the fuel contained inside said cylinder 15. The device 17 comprises a tubular sleeve 18, which is engaged slidingly inside the bore 8 coaxially to the axis 9, extends around the cylinder 15, and has an internal annular flange 19 that projects radially from an internal surface of the sleeve 18 and splits said sleeve 18 into two cylindrical portions 20, 21, of which the portion 20 is on the side towards the bore 6.
The device 17 further comprises a cam follower 22 comprising a coupling block 23 of substantially cylindrical shape, which is blocked by interference inside the portion 20, and is in contact with the flange 19, and bears a cam follower roll 24.
The roll 24 projects from the block 23 towards the bore 6, and is coupled rotationally to the block 23 so as to rotate, with respect to said block 23, about its own longitudinal axis 25 which is substantially perpendicular to the axis 9.
The flange 19 bears an annular disc 26, which extends around the piston 16, is inserted inside the portion 21 of the sleeve 18 coaxially to the axis 9, and has an outer peripheral edge axially on the side towards the flange 19 and an inner peripheral edge axially on the side towards a head of said piston 16.
The device 17 further comprises a compression spring 27, which is mounted between the protuberance 11 and the sleeve 18 coaxially to the axis 9, and is interposed between the cylinder head 10 and the disc 26 so as to move, and normally keep, the disc 26 in contact with the flange 19 and the roll 24 in contact with a cam 28 formed on an external surface of an intermediate portion of a transmission shaft 29 mounted through the bore 6 so as to rotate, with respect to the housing 5, about the axis 7.
The supply of fuel into each cylinder 15 is selectively controlled by an associated intake valve 30 of known type, while the supply of fuel from each cylinder 15 to the internal combustion engine (not shown) is selectively controlled by an associated delivery valve 31 of known type.
The intake valve 30 comprises a valve body 32 blocked axially inside the portion 13 by a cover 33 screwed into the cylinder head 10, and a shut-off member 34 of elongate shape, which is mounted coaxially to the axis 9, and is engaged slidingly through the valve body 32 so as to move parallel to the axis 9 between a closed position and an open position of the cylinder 15.
The shut-off member 34 is moved into its closed position, and normally kept there, by a spring 35 interposed between the valve body 32 and a disc 36, which is fitted on the shut-off member 34 transversely to the axis 9, and is coupled by interference with said shut-off member 34.
As shown in Figure 3, the shut-off member 34 comprises a coupling portion 37 of cylindrical shape extending inside the disc 36.
The disc 36 has a central bore 38, which is delimited axially by two end planes E that are perpendicular to the axis 9, and is further delimited by an internal wall 39 extending around said axis 9. The bore 38 has, in an initial configuration thereof (not shown), prior to coupling with the shut-off member 34, a variable diameter with the largest diameter at the planes E and the smallest diameter at an intermediate plane I that is parallel to said planes E.
Consequently, the wall 39 has a shape domed towards the axis 9.
With reference to what is described above, it should be specified that the portion 37 of the shut-off member 34 has a diameter smaller than the diameter of the bore 38 at the planes E and a diameter larger than the diameter of the bore 38 at the plane I.
In this case: the bore 38 has the same diameter at the planes E; the plane I is a median plane of the disc 36 equidistant from the planes E; and the diameter of the bore 38 varies continuously from each plane E to the plane I.
Moreover, the bore 38 has, in a final configuration thereof (Figure 3), following the coupling with the shut-off member 34, a central section 40 of cylindrical shape, and two end sections 41 arranged on either side of the section 40 along the axis 9. Each section 41 has a diameter that increases from the section 40 to the relative plane E in such a way that, at the planes E, the wall 39 is not in contact with the shut-off member 34.
In other words, in the final configuration thereof (Figure 3), the bore 38 is coupled by interference with the shut-off member 34 only at the section 40, and has a diameter larger than the diameter of the portion 37 along the sections 41. Since, at the planes E, the shut-off member 34 and the disc 36 are not in contact with one another, the contact pressures at the planes E are relatively low and the shut-off member 34 has a relatively good lifetime and resistance to wear.

Claims

Claims
1. Pump assembly for supplying fuel, preferably diesel, to an internal combustion engine, the pump assembly comprising a pump body (4); at least one cylinder (15) made in the pump body (4); a piston (16) engaged slidingly in the cylinder (15); an actuator device (17) for pushing the piston (16) with an alternating rectilinear movement comprising an intake stroke for taking in the fuel into the cylinder (15) and a compression stroke for compressing the fuel contained inside said cylinder (15); and an intake valve (30) for controlling the supply of fuel to the cylinder (15); the intake valve (30) comprising a shut-off member (34) that can move between an open position and a closed position of the cylinder (15), a disc (36) having a central bore (38) coupled by interference with a substantially cylindrical coupling portion (37) of the shut-off member (34), and a spring (35) engaged in the disc (36) so as to move the shut-off member (34) into its closed position, and normally keep it there; and being characterized in that the central bore (38) is coupled by interference with the shut-off member (34) only at a central section (40) thereof, and further comprises two end sections (41) arranged axially on either side of said central section (40); each end section (41) having a diameter larger than a diameter of the coupling portion (37) of the shut- off member (34).
2. Pump assembly according to Claim 1, in which the central bore (38) has a longitudinal axis (9), and is delimited axially by two end planes (E) that are perpendicular to said longitudinal axis (9); each end section (41) having a diameter that increases from the central section (40) to the relative end plane (E).
3. Pump assembly according to Claim 1 or 2, in which the central bore (38) has a longitudinal axis (9), is delimited axially by two end planes (E) that are
perpendicular to the longitudinal axis (9), and further has, in an initial
configuration thereof prior to coupling with the shut-off member (34), a variable diameter with the largest diameter at the end planes (E) and the smallest diameter at an intermediate plane (I) that is perpendicular to said longitudinal axis (9).
4. Pump assembly according to Claim 3, in which the central bore (38) is delimited by an internal wall (39) which has a shape domed towards the longitudinal axis (9).
5. Pump assembly according to Claim 3 or 4, in which the central bore (38) has, at the end planes (E), respective diameters that are the same.
6. Pump assembly according to any one of Claims 3 to 5, in which the
intermediate plane (I) is equidistant from the end planes (E).
7. Pump assembly according to any one of Claims 3 to 6, in which the diameter of the central bore (38) varies continuously from each end plane (E) to the intermediate plane (I).
8. Pump assembly according to any one of the preceding claims, in which the intake valve (30) further comprises a valve body (32) engaged slidingly by the shut-off member (34); the spring (35) being interposed between the valve body (32) and the disc (36).
PCT/EP2018/067241 2017-07-07 2018-06-27 Pump assembly for supplying fuel, preferably diesel, to an internal combustion engine WO2019007776A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2019569919A JP2020524238A (en) 2017-07-07 2018-06-27 Pump assembly for supplying fuel, preferably diesel, to an internal combustion engine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102017000076822A IT201700076822A1 (en) 2017-07-07 2017-07-07 PUMPING GROUP FOR FUEL SUPPLEMENTATION, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE
IT102017000076822 2017-07-07

Publications (1)

Publication Number Publication Date
WO2019007776A1 true WO2019007776A1 (en) 2019-01-10

Family

ID=60294320

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/067241 WO2019007776A1 (en) 2017-07-07 2018-06-27 Pump assembly for supplying fuel, preferably diesel, to an internal combustion engine

Country Status (3)

Country Link
JP (1) JP2020524238A (en)
IT (1) IT201700076822A1 (en)
WO (1) WO2019007776A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007037084A1 (en) * 2007-08-06 2009-02-12 Robert Bosch Gmbh Fuel high pressure pump for fuel injection system of internal combustion engine, has pumping element with element space that is connected with low pressure, where quantity or pressure compensating device is attached to suction valve
DE102010031600A1 (en) * 2010-07-21 2012-01-26 Robert Bosch Gmbh High pressure pump i.e. radial piston pump, for fuel injector of combustion engine in motor car, has plug comprising sealing collar located underneath screw thread, where filter element designed as wire is arranged in screw thread
DE102013218876A1 (en) * 2013-09-19 2015-03-19 Robert Bosch Gmbh High pressure pump for a fuel injection system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007037084A1 (en) * 2007-08-06 2009-02-12 Robert Bosch Gmbh Fuel high pressure pump for fuel injection system of internal combustion engine, has pumping element with element space that is connected with low pressure, where quantity or pressure compensating device is attached to suction valve
DE102010031600A1 (en) * 2010-07-21 2012-01-26 Robert Bosch Gmbh High pressure pump i.e. radial piston pump, for fuel injector of combustion engine in motor car, has plug comprising sealing collar located underneath screw thread, where filter element designed as wire is arranged in screw thread
DE102013218876A1 (en) * 2013-09-19 2015-03-19 Robert Bosch Gmbh High pressure pump for a fuel injection system

Also Published As

Publication number Publication date
JP2020524238A (en) 2020-08-13
IT201700076822A1 (en) 2019-01-07

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