WO2019185531A1 - Method for manufacturing a head-piece of a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine - Google Patents

Method for manufacturing a head-piece of a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine Download PDF

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Publication number
WO2019185531A1
WO2019185531A1 PCT/EP2019/057410 EP2019057410W WO2019185531A1 WO 2019185531 A1 WO2019185531 A1 WO 2019185531A1 EP 2019057410 W EP2019057410 W EP 2019057410W WO 2019185531 A1 WO2019185531 A1 WO 2019185531A1
Authority
WO
WIPO (PCT)
Prior art keywords
head
piece
fuel
combustion engine
internal combustion
Prior art date
Application number
PCT/EP2019/057410
Other languages
French (fr)
Inventor
Karsten Frank
Federica Tornese
Silvia ROCCO
Markus GAEMLICH
Michael Stengele
Martino CECERE
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 WO2019185531A1 publication Critical patent/WO2019185531A1/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
    • F04B53/007—Cylinder heads
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/04—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
    • 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
    • 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
    • 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
    • F04B1/0421—Cylinders
    • 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
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/03—Fuel-injection apparatus having means for reducing or avoiding stress, e.g. the stress caused by mechanical force, by fluid pressure or by temperature variations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8053—Fuel injection apparatus manufacture, repair or assembly involving mechanical deformation of the apparatus or parts thereof
    • 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
    • F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam
    • 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
    • F04B1/053—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
    • 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
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0076—Piston machines or pumps characterised by having positively-driven valving the members being actuated by electro-magnetic means
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/042—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being cams

Definitions

  • the present invention relates to a method for manufacturing a head-piece of a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine.
  • a pumping unit of the type comprising a high-pressure pump for feeding the fuel to an internal combustion engine; a pre-feed pump for feeding the fuel from a storage tank to the high-pressure pump; and a hydraulic circuit comprising, in turn, a first line for connecting together the storage tank and the pre-feed pump, a second line for connecting together the pre-feed pump and the high-pressure pump, and a third line for connecting together the high-pressure pump and the internal combustion engine.
  • the high-pressure pump is a piston pump provided with a pump body comprising a support housing having a central hole and a side hole which are transverse to each other.
  • the side hole is closed by a head-piece which is arranged in contact with the support housing and has a lug projecting inside said side hole.
  • the head-piece has a central hole comprising a wide portion and narrow portion which are arranged in succession along a longitudinal axis of said central hole.
  • the narrow portion defines a cylinder which is slidably engaged by piston movable, by means of the thrusting action of an actuating device which is housed at least partly inside the central hole of the support housing, with an alternating rectilinear movement comprising an intake stroke for drawing the fuel into the cylinder and a compression stroke for compressing the fuel contained inside said cylinder.
  • the wide portion and the narrow portion of the central hole of the head-piece are connected together at an annular shoulder defining a seat slidably engaged by a closing member of an intake valve designed to control selectively feeding of fuel to the cylinder.
  • the head-piece also has a side hole defining a delivery duct which
  • the known pumping units of the type described above have a number of drawbacks due mainly to the fact that the head-piece is subject to tensile stresses which are relatively high and which may cause breakage of said head-piece due to wear.
  • the object of the present invention is to provide a method for manufacturing a head-piece of pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine, which does not have the aforementioned drawbacks and is simple and inexpensive to produce.
  • Figure 1 is a schematic cross-sectional view, with parts removed for greater clarity, of a preferred embodiment of the pumping unit according to the present invention
  • Figure 2 is a schematic cross-sectional view, with parts removed for greater clarity, of the pumping unit according to Figure 1;
  • Figure 3 is a schematic cross-sectional view of a head-piece of the pumping unit shown in Figures 1 and 2.
  • 1 denotes in its entirety, a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine (not shown).
  • fuel preferably diesel fuel
  • the pumping unit 1 comprises a piston pump 2 for feeding the fuel to the said internal combustion engine (not shown); and a pre-feed pump 3, for example a gear pump, for feeding the fuel from a storage tank (not shown) to said pump 2.
  • a pre-feed pump 3 for example a gear pump, for feeding the fuel from a storage tank (not shown) to said pump 2.
  • the pump 2 has a pump body 4 comprising a support housing 5 which is provided with a central hole 6 having a longitudinal axis 7 and also has a side hole 8 which has a longitudinal axis 9 transverse to the axis 7 and extends radially towards the outside of the housing from said hole 6.
  • the hole 8 is closed by a head-piece 10 which is arranged in contact with the housing 5 and has a lug 11 projecting inside the hole 8 coaxially with the axis 9.
  • the head-piece 10 has a central hole 12 which is formed through the head-piece 10 coaxially with the axis 9 and comprises a wide portion 13 and a narrow portion 14 which are aligned with each other along said axis 9.
  • the portion 14 faces the hole 6 and defines a cylinder 15 which is slidably engaged by a piston 16 movable along the cylinder 15, by means of the thrusting action of an actuating device 17, with an alternating rectilinear movement comprising an intake stroke for drawing 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 slidably engaged inside the hole 8 coaxially with the axis 9, extends around the cylinder 15 and has an inner annular flange 19 which projects radially from an inner surface of the sleeve 18 and divides said sleeve 18 into two cylindrical portions 20, 21, the portion 20 of which faces the hole 6.
  • the device 17 has, moreover, a tappet system 22 comprising a coupling block with a substantially cylindrical shape, which is locked by means of interference inside the portion 20, is arranged in contact with the flange 19 and support a tappet system roller 24.
  • the roller 24 projects from the block 23 towards the hole 6 and is rotatably coupled with the block 23 so as to rotate, relative to said block 23, about its longitudinal axis 25 substantially perpendicular to the axis 9.
  • the flange 19 supports an annular disc 26 which extends around the around the piston 16, is inserted inside the portion 21 of the sleeve 18 coaxially with the axis 9 and has an outer perimeter edge axially facing the flange 19 and an inner perimeter edge axially facing a head of said piston 16.
  • the device 17 also comprises a compression spring 27 which is mounted between the lug 11 and the sleeve 18 coaxially with the axis 9 and is arranged between the head-piece 10 and the disc 26 so as to displace, and normally keep, the disk 26 in contact with the flange 19 and the roller 24 in contact with a cam 28 formed on an outer surface of an intermediate portion of a transmission shaft 29 mounted through the hole 6 so as to rotate, relative to the housing 5, about the axis 7.
  • the head-piece 10 supports an intake valve 30 for drawing the fuel into the cylinder 15 and a delivery valve 31 for supplying the fuel to the internal combustion engine (not shown).
  • the portions 13 and 14 of the hole 12 are connected together at an annular shoulder 32 defining a central seat 33 slidably engaged by a closing member 34 of the valve 30.
  • the closing member 34 is moreover displaced from its closing position into an opening position (not shown) against the thrust of the spring 35 by an
  • the valve 31 is housed inside a delivery duct 38, which has a longitudinal axis 39 transverse to the axis 9, communicates with the cylinder 15 and is connected in a known manner to the internal combustion engine (not shown).
  • At least the seat 33, the narrow portion 14 of the hole 12 and the duct 38 are subject to a surface compression and plastic deformation treatment designed to generate in the head-piece 10 compression stresses which compensate for the tensile stresses generated inside the head-piece 10 by oscillation of the fuel pressure inside said head-piece 10.
  • the surface compression and plastic deformation treatment used is shot-blasting where a stream of particles, in particular, glass- fibre particles, is directed against the surface of the seat 33, the narrow portion 14 of the hole 12 and the duct 38 by means of a compressed air flow or by means of ultrasound.

Landscapes

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

Abstract

Method for manufacturing a head-piece (10) of a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine, whereby the head-piece (10) is provided with a central hole (12) configured to define a cylinder (15) able to be slidably engaged by a piston (16) and a seat (33) designed to be slidably engaged by a closing member (34) of an intake valve (30) and is further provided with a delivery duct (38) connected to the cylinder (15) and the internal combustion engine; at least part of a surface of the central hole (12) and/or a surface of the delivery duct (38) being superficially compressed and plastically deformed by means of shot-blasting.

Description

Description
Title
METHOD FOR MANUFACTURING A HEAD-PIECE OF A PUMPING UNIT FOR FEEDING FU EL, PREFERABLY DIESEL FUEL, TO AN INTERNAL
COMBUSTION ENGINE
The present invention relates to a method for manufacturing a head-piece of a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine.
In the sector of pumping units for feeding fuel to an internal combustion engine it is known to provide a pumping unit of the type comprising a high-pressure pump for feeding the fuel to an internal combustion engine; a pre-feed pump for feeding the fuel from a storage tank to the high-pressure pump; and a hydraulic circuit comprising, in turn, a first line for connecting together the storage tank and the pre-feed pump, a second line for connecting together the pre-feed pump and the high-pressure pump, and a third line for connecting together the high-pressure pump and the internal combustion engine.
The high-pressure pump is a piston pump provided with a pump body comprising a support housing having a central hole and a side hole which are transverse to each other.
The side hole is closed by a head-piece which is arranged in contact with the support housing and has a lug projecting inside said side hole.
The head-piece has a central hole comprising a wide portion and narrow portion which are arranged in succession along a longitudinal axis of said central hole. The narrow portion defines a cylinder which is slidably engaged by piston movable, by means of the thrusting action of an actuating device which is housed at least partly inside the central hole of the support housing, with an alternating rectilinear movement comprising an intake stroke for drawing the fuel into the cylinder and a compression stroke for compressing the fuel contained inside said cylinder.
The wide portion and the narrow portion of the central hole of the head-piece are connected together at an annular shoulder defining a seat slidably engaged by a closing member of an intake valve designed to control selectively feeding of fuel to the cylinder.
The head-piece also has a side hole defining a delivery duct which
communicates hydraulically with the cylinder and houses inside it a delivery valve designed to control selectively the feeding of fuel to the internal combustion engine.
Since the transfer of the fuel from the second line to the third line of the hydraulic circuit by means of the piston pump causes oscillation of the pressure of the fuel inside the head-piece, the known pumping units of the type described above have a number of drawbacks due mainly to the fact that the head-piece is subject to tensile stresses which are relatively high and which may cause breakage of said head-piece due to wear.
The object of the present invention is to provide a method for manufacturing a head-piece of pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine, which does not have the aforementioned drawbacks and is simple and inexpensive to produce.
According to the present invention a method for manufacturing a head-piece of a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine is provided, as claimed in the attached claims. The present invention will now be described with reference to the accompanying drawings which illustrate a non-limiting example of embodiment thereof, in which:
Figure 1 is a schematic cross-sectional view, with parts removed for greater clarity, of a preferred embodiment of the pumping unit according to the present invention;
Figure 2 is a schematic cross-sectional view, with parts removed for greater clarity, of the pumping unit according to Figure 1; and
Figure 3 is a schematic cross-sectional view of a head-piece of the pumping unit shown in Figures 1 and 2.
With reference to Figures 1 and 2, 1 denotes in its entirety, a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine (not shown).
The pumping unit 1 comprises a piston pump 2 for feeding the fuel to the said internal combustion engine (not shown); and a pre-feed pump 3, for example a gear pump, for feeding the fuel from a storage tank (not shown) to said pump 2.
The pump 2 has a pump body 4 comprising a support housing 5 which is provided with a central hole 6 having a longitudinal axis 7 and also has a side hole 8 which has a longitudinal axis 9 transverse to the axis 7 and extends radially towards the outside of the housing from said hole 6.
The hole 8 is closed by a head-piece 10 which is arranged in contact with the housing 5 and has a lug 11 projecting inside the hole 8 coaxially with the axis 9.
The head-piece 10 has a central hole 12 which is formed through the head-piece 10 coaxially with the axis 9 and comprises a wide portion 13 and a narrow portion 14 which are aligned with each other along said axis 9.
The portion 14 faces the hole 6 and defines a cylinder 15 which is slidably engaged by a piston 16 movable along the cylinder 15, by means of the thrusting action of an actuating device 17, with an alternating rectilinear movement comprising an intake stroke for drawing 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 slidably engaged inside the hole 8 coaxially with the axis 9, extends around the cylinder 15 and has an inner annular flange 19 which projects radially from an inner surface of the sleeve 18 and divides said sleeve 18 into two cylindrical portions 20, 21, the portion 20 of which faces the hole 6.
The device 17 has, moreover, a tappet system 22 comprising a coupling block with a substantially cylindrical shape, which is locked by means of interference inside the portion 20, is arranged in contact with the flange 19 and support a tappet system roller 24.
The roller 24 projects from the block 23 towards the hole 6 and is rotatably coupled with the block 23 so as to rotate, relative to said block 23, about its longitudinal axis 25 substantially perpendicular to the axis 9.
The flange 19 supports an annular disc 26 which extends around the around the piston 16, is inserted inside the portion 21 of the sleeve 18 coaxially with the axis 9 and has an outer perimeter edge axially facing the flange 19 and an inner perimeter edge axially facing a head of said piston 16.
The device 17 also comprises a compression spring 27 which is mounted between the lug 11 and the sleeve 18 coaxially with the axis 9 and is arranged between the head-piece 10 and the disc 26 so as to displace, and normally keep, the disk 26 in contact with the flange 19 and the roller 24 in contact with a cam 28 formed on an outer surface of an intermediate portion of a transmission shaft 29 mounted through the hole 6 so as to rotate, relative to the housing 5, about the axis 7. The head-piece 10 supports an intake valve 30 for drawing the fuel into the cylinder 15 and a delivery valve 31 for supplying the fuel to the internal combustion engine (not shown).
The portions 13 and 14 of the hole 12 are connected together at an annular shoulder 32 defining a central seat 33 slidably engaged by a closing member 34 of the valve 30.
The closing member 34 is displaced, and normally kept, in a closing position (Figures 1 and 2) by a spring 35 arranged between the shoulder 32 and a disc 36 mounted on said closing member 34.
The closing member 34 is moreover displaced from its closing position into an opening position (not shown) against the thrust of the spring 35 by an
electromagnetic actuator 37 of the known type.
The valve 31 is housed inside a delivery duct 38, which has a longitudinal axis 39 transverse to the axis 9, communicates with the cylinder 15 and is connected in a known manner to the internal combustion engine (not shown).
At least the seat 33, the narrow portion 14 of the hole 12 and the duct 38 are subject to a surface compression and plastic deformation treatment designed to generate in the head-piece 10 compression stresses which compensate for the tensile stresses generated inside the head-piece 10 by oscillation of the fuel pressure inside said head-piece 10.
In the case in question the surface compression and plastic deformation treatment used is shot-blasting where a stream of particles, in particular, glass- fibre particles, is directed against the surface of the seat 33, the narrow portion 14 of the hole 12 and the duct 38 by means of a compressed air flow or by means of ultrasound.
With the shot-blasting treatment it is possible to limit the risk of breakage of the head-piece 10 due to fatigue

Claims

Claims
1. Method for manufacturing a head-piece (10) of a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine, the head-piece (10) being provided with a central hole (12) configured to define a cylinder (15) designed to be slidably engaged by a piston (16) of the pumping unit and a coupling seat (33) designed to be slidably engaged by a closing member (34) of an intake valve (30) of said pumping unit, the head-piece (10) being provided moreover with a delivery duct (38) connected to the cylinder (15) and the internal combustion engine; the method being characterized in that it comprises the step of:
performing a surface compression and plastic deformation of at least part of the surface of the central hole (12) and/or of a surface of the delivery duct (38).
2. Method according to Claim 1, wherein the surface compression and plastic deformation are performed by means of shot-blasting where a stream of particles, in particular glass-fibre particles, is directed against at least part of the surface of the central hole (12) and/or the surface of the delivery duct (38) by means of a compressed air flow.
3. Method according to Claim 1, wherein the surface compression and plastic deformation are performed by means of shot-blasting, a stream of particles, in particular glass-fibre particles, being directed against at least part of the surface of the central hole (12) and/or the surface of the delivery duct (38) by means of ultrasound.
PCT/EP2019/057410 2018-03-28 2019-03-25 Method for manufacturing a head-piece of a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine WO2019185531A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102018000004042 2018-03-28
IT201800004042A IT201800004042A1 (en) 2018-03-28 2018-03-28 METHOD FOR MAKING A HEAD OF A PUMPING GROUP TO FEED FUEL, PREFERABLY DIESEL OIL, TO AN INTERNAL COMBUSTION ENGINE

Publications (1)

Publication Number Publication Date
WO2019185531A1 true WO2019185531A1 (en) 2019-10-03

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WO (1) WO2019185531A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900021801A1 (en) * 2019-11-21 2021-05-21 Bosch Gmbh Robert PUMPING GROUP TO FEED FUEL, PREFERABLY DIESEL, TO AN INTERNAL COMBUSTION ENGINE

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160130679A1 (en) * 2014-11-12 2016-05-12 William J. Cober Post Machining Multi-Step Material Working Treatment of Fluid End Housing
CN205663608U (en) * 2016-06-07 2016-10-26 宝石机械成都装备制造分公司 Fracturing pump valve case of plunger cylinder liner and clack box body integral type
US20170348826A1 (en) * 2016-06-06 2017-12-07 Superior Shot Peening, Inc. Tools and related methods for cold working fluid ends

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160130679A1 (en) * 2014-11-12 2016-05-12 William J. Cober Post Machining Multi-Step Material Working Treatment of Fluid End Housing
US20170348826A1 (en) * 2016-06-06 2017-12-07 Superior Shot Peening, Inc. Tools and related methods for cold working fluid ends
CN205663608U (en) * 2016-06-07 2016-10-26 宝石机械成都装备制造分公司 Fracturing pump valve case of plunger cylinder liner and clack box body integral type

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900021801A1 (en) * 2019-11-21 2021-05-21 Bosch Gmbh Robert PUMPING GROUP TO FEED FUEL, PREFERABLY DIESEL, TO AN INTERNAL COMBUSTION ENGINE

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Publication number Publication date
IT201800004042A1 (en) 2019-09-28

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