IT201800004042A1 - METHOD FOR MAKING A HEAD OF A PUMPING GROUP TO FEED FUEL, PREFERABLY DIESEL OIL, TO AN INTERNAL COMBUSTION ENGINE - Google Patents
METHOD FOR MAKING A HEAD OF A PUMPING GROUP TO FEED FUEL, PREFERABLY DIESEL OIL, TO AN INTERNAL COMBUSTION ENGINE Download PDFInfo
- Publication number
- IT201800004042A1 IT201800004042A1 IT201800004042A IT201800004042A IT201800004042A1 IT 201800004042 A1 IT201800004042 A1 IT 201800004042A1 IT 201800004042 A IT201800004042 A IT 201800004042A IT 201800004042 A IT201800004042 A IT 201800004042A IT 201800004042 A1 IT201800004042 A1 IT 201800004042A1
- Authority
- IT
- Italy
- Prior art keywords
- head
- combustion engine
- internal combustion
- fuel
- central hole
- Prior art date
Links
- 239000000446 fuel Substances 0.000 title claims description 23
- 238000005086 pumping Methods 0.000 title claims description 16
- 238000002485 combustion reaction Methods 0.000 title claims description 15
- 238000000034 method Methods 0.000 title claims description 9
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 238000005480 shot peening Methods 0.000 claims description 4
- 239000003365 glass fiber Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000002604 ultrasonography Methods 0.000 claims description 2
- 239000002283 diesel fuel Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 206010016256 fatigue Diseases 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
- Fuel-Injection Apparatus (AREA)
Description
DESCRIZIONE DESCRIPTION
del brevetto per invenzione industriale dal titolo: of the patent for industrial invention entitled:
“METODO PER REALIZZARE UNA TESTATA DI UN GRUPPO DI POMPAGGIO PER ALIMENTARE COMBUSTIBILE, PREFERIBILMENTE GASOLIO, AD UN MOTORE A COMBUSTIONE INTERNA” "METHOD FOR MAKING A HEAD OF A PUMPING GROUP TO FEED FUEL, PREFERABLY DIESEL OIL, TO AN INTERNAL COMBUSTION ENGINE"
La presente invenzione è relativa ad un metodo per la realizzazione di una testata di un gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna. The present invention relates to a method for manufacturing a head of a pumping unit to feed fuel, preferably diesel oil, to an internal combustion engine.
Nel settore dei gruppi di pompaggio per alimentare combustibile ad un motore a combustione interna è noto realizzare un gruppo di pompaggio del tipo comprendente una pompa di alta pressione per alimentare il combustibile ad un motore a combustione interna; una pompa di prealimentazione per alimentare il combustibile da un serbatoio di contenimento alla pompa di alta pressione; ed un circuito idraulico comprendente, a sua volta, un primo ramo per collegare fra loro il serbatoio di contenimento e la pompa di pre-alimentazione, un secondo ramo per collegare fra loro la pompa di pre-alimentazione e la pompa di alta pressione, ed un terzo ramo per collegare fra loro la pompa di alta pressione ed il motore a combustione interna. In the field of pumping units for supplying fuel to an internal combustion engine, it is known to provide a pumping unit of the type comprising a high pressure pump for supplying fuel to an internal combustion engine; a pre-feed pump for feeding fuel from a containment tank to the high pressure pump; and a hydraulic circuit comprising, in turn, a first branch for connecting the containment tank and the pre-feeding pump together, a second branch for connecting the pre-feeding pump and the high pressure pump together, and a third branch to connect the high pressure pump and the internal combustion engine together.
La pompa di alta pressione è una pompa a pistoni provvista di un corpo pompa comprendente una carcassa di supporto presentante un foro centrale ed un foro laterale fra loro trasversali. The high pressure pump is a piston pump provided with a pump body comprising a support casing having a central hole and a lateral hole which are transversal to each other.
Il foro laterale è chiuso da una testata, che è disposta a contatto della carcassa di supporto, e presenta una appendice sporgente all’interno del foro laterale stesso. The side hole is closed by a head, which is arranged in contact with the support frame, and has a protruding appendage inside the side hole itself.
La testata presenta un foro centrale comprendente una porzione allargata ed una porzione ristretta disposte in successione lungo un asse longitudinale del foro centrale stesso. The head has a central hole comprising an enlarged portion and a narrow portion arranged in succession along a longitudinal axis of the central hole itself.
La porzione ristretta definisce un cilindro impegnato in maniera scorrevole da un pistone mobile, sotto la spinta di un dispositivo di azionamento alloggiato almeno in parte nel foro centrale della carcassa di supporto, con un moto rettilineo alternativo comprendente una corsa di aspirazione del combustibile nel cilindro ed una corsa di compressione del combustibile contenuto all’interno del cilindro stesso. The restricted portion defines a cylinder slidably engaged by a movable piston, under the thrust of an actuation device housed at least in part in the central hole of the support casing, with a reciprocating rectilinear motion comprising an intake stroke of the fuel in the cylinder and a compression stroke of the fuel contained inside the cylinder itself.
La porzione allargata e la porzione ristretta del foro centrale della testata sono collegate fra loro in corrispondenza di uno spallamento anulare definente una sede impegnata in maniera scorrevole da un otturatore di una valvola di aspirazione atta a controllare selettivamente l’alimentazione di combustibile al cilindro. The enlarged portion and the restricted portion of the central hole of the head are connected to each other at an annular shoulder defining a seat engaged in a sliding manner by a shutter of an intake valve adapted to selectively control the supply of fuel to the cylinder.
La testata presenta, inoltre, un foro laterale definente un condotto di mandata, che comunica idraulicamente con il cilindro, ed alloggia al proprio interno una valvola di mandata atta a controllare selettivamente l’alimentazione di combustibile al motore a combustione interna. The cylinder head also has a side hole defining a delivery duct, which communicates hydraulically with the cylinder, and houses a delivery valve designed to selectively control the supply of fuel to the internal combustion engine.
Dal momento che il trasferimento del combustibile dal secondo ramo al terzo ramo del circuito idraulico tramite la pompa a pistoni genera un andamento oscillante della pressione del combustibile all’interno della testata, i gruppi di pompaggio noti del tipo sopra descritto presentano alcuni inconvenienti principalmente discendenti dal fatto che la testata è sottoposta a sollecitazioni di trazione relativamente elevate che possono causare rotture a fatica della testata stessa. Since the transfer of the fuel from the second branch to the third branch of the hydraulic circuit by means of the piston pump generates an oscillating trend of the fuel pressure inside the head, known pumping units of the type described above have some drawbacks mainly deriving from the the fact that the head is subjected to relatively high tensile stresses which can cause fatigue failure of the head itself.
Scopo della presente invenzione è di fornire un metodo per la realizzazione di una testata di un gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna che sia esente dagli inconvenienti sopra descritti e che sia di semplice ed economica attuazione. The object of the present invention is to provide a method for manufacturing a head of a pumping unit for supplying fuel, preferably diesel oil, to an internal combustion engine which is free from the drawbacks described above and which is simple and economical to implement.
Secondo la presente invenzione viene fornito un metodo per la realizzazione di una testata di un gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna come rivendicato nelle rivendicazioni allegate. According to the present invention, a method is provided for manufacturing a head of a pumping unit for feeding fuel, preferably diesel oil, to an internal combustion engine as claimed in the attached claims.
La presente invenzione verrà ora descritta con riferimento ai disegni annessi, che ne illustrano un esempio di attuazione non limitativo, in cui: The present invention will now be described with reference to the attached drawings, which illustrate a non-limiting example of embodiment, in which:
la figura 1 è una prima vista schematica in sezione, con parti asportate per chiarezza, di una preferita forma di attuazione del gruppo di pompaggio della presente invenzione; Figure 1 is a first schematic sectional view, with parts removed for clarity, of a preferred embodiment of the pumping unit of the present invention;
la figura 2 è una seconda vista schematica in sezione, con parti asportate per chiarezza, del gruppo di pompaggio della figura 1; e Figure 2 is a second schematic sectional view, with parts removed for clarity, of the pumping unit of Figure 1; And
la figura 3 è una vista schematica in sezione di una testata del gruppo di pompaggio delle figure 1 e 2. Figure 3 is a schematic sectional view of a head of the pumping unit of Figures 1 and 2.
Con riferimento alle figure 1 e 2, con 1 è indicato, nel suo complesso, un gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna (non illustrato). With reference to Figures 1 and 2, 1 indicates, as a whole, a pumping unit for feeding fuel, preferably diesel oil, to an internal combustion engine (not shown).
Il gruppo di pompaggio 1 comprende una pompa 2 a pistoni per alimentare il combustibile al citato motore a combustione interna (non illustrato); ed una pompa di prealimentazione 3, per esempio una pompa ad ingranaggi, per alimentare il combustibile da un serbatoio di contenimento (non illustrato) alla pompa 2 stessa. The pumping unit 1 comprises a piston pump 2 for supplying fuel to the aforementioned internal combustion engine (not shown); and a pre-feeding pump 3, for example a gear pump, for feeding fuel from a containment tank (not shown) to the pump 2 itself.
La pompa 2 presenta un corpo pompa 4 comprendente una carcassa 5 di supporto, la quale è provvista di un foro 6 centrale avente un asse 7 longitudinale, e presenta, inoltre, un foro 8 laterale, che ha un asse 9 longitudinale trasversale all’asse 7, e si estende radialmente verso l’esterno della carcassa 5 a partire dal foro 6 stesso. The pump 2 has a pump body 4 comprising a support casing 5, which is provided with a central hole 6 having a longitudinal axis 7, and also has a lateral hole 8, which has a longitudinal axis 9 transverse to the axis 7, and extends radially towards the outside of the casing 5 starting from the hole 6 itself.
Il foro 8 è chiuso da una testata 10, la quale è disposta a contatto della carcassa 5, e presenta una appendice 11 sporgente all’interno del foro 8 coassialmente all’asse 9. The hole 8 is closed by a head 10, which is arranged in contact with the casing 5, and has an appendix 11 protruding inside the hole 8 coaxially to the axis 9.
La testata 10 presenta un foro 12 centrale, il quale è ricavato attraverso la testata 10 coassialmente all’asse 9, e comprende una porzione 13 allargata ed una porzione 14 ristretta allineate fra loro lungo l’asse 9 stesso. The head 10 has a central hole 12, which is obtained through the head 10 coaxially to the axis 9, and includes an enlarged portion 13 and a narrow portion 14 aligned with each other along the axis 9 itself.
La porzione 14 è affacciata al foro 6, e definisce un cilindro 15 impegnato in maniera scorrevole da un pistone 16 mobile lungo il cilindro 15, sotto la spinta di un dispositivo 17 di azionamento, con un moto rettilineo alternativo comprendente una corsa di aspirazione del combustibile nel cilindro 15 ed una corsa di compressione del combustibile contenuto all’interno del cilindro 15 stesso. The portion 14 faces the hole 6, and defines a cylinder 15 slidingly engaged by a piston 16 movable along the cylinder 15, under the thrust of an actuation device 17, with a reciprocating rectilinear motion comprising a fuel suction stroke in the cylinder 15 and a compression stroke of the fuel contained inside the cylinder 15 itself.
Il dispositivo 17 comprende un manicotto 18 tubolare, il quale è impegnato in maniera scorrevole all’interno del foro 8 coassialmente all’asse 9, si estende attorno al cilindro 15, e presenta una flangia 19 anulare interna, che sporge radialmente da una superficie interna del manicotto 18, e divide il manicotto 18 stesso in due porzioni 20, 21 cilindriche, di cui la porzione 20 è affacciata al foro 6. The device 17 comprises a tubular sleeve 18, which is slidingly engaged inside the hole 8 coaxially to the axis 9, extends around the cylinder 15, and has an internal annular flange 19, which protrudes radially from an internal surface of the sleeve 18, and divides the sleeve 18 itself into two cylindrical portions 20, 21, of which the portion 20 faces the hole 6.
Il dispositivo 17 presenta, inoltre, una punteria 22 comprendente un blocco 23 di accoppiamento di forma sostanzialmente cilindrica, il quale è bloccato per interferenza all’interno della porzione 20, è disposto a contatto della flangia 19, e supporta un rullo 24 di punteria. The device 17 also has a tappet 22 comprising a substantially cylindrical coupling block 23, which is blocked by interference within the portion 20, is arranged in contact with the flange 19, and supports a tappet roller 24.
Il rullo 24 sporge dal blocco 23 verso il foro 6, ed è accoppiato in maniera girevole al blocco 23 per ruotare, rispetto al blocco 23 stesso, attorno ad un proprio asse 25 longitudinale sostanzialmente perpendicolare all’asse 9. The roller 24 protrudes from the block 23 towards the hole 6, and is rotatably coupled to the block 23 to rotate, with respect to the block 23 itself, around its own longitudinal axis 25 substantially perpendicular to the axis 9.
La flangia 19 supporta un piattello 26 anulare, il quale si estende attorno al pistone 16, è inserito all’interno della porzione 21 del manicotto 18 coassialmente all’asse 9, e presenta un bordo perimetrale esterno affacciato assialmente alla flangia 19 ed un bordo perimetrale interno affacciato assialmente ad una testa del pistone 16 stesso. The flange 19 supports an annular plate 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 external perimeter edge facing axially to the flange 19 and a perimetral edge internal facing axially to a head of the piston 16 itself.
Il dispositivo 17 comprende, inoltre, una molla 27 a compressione, la quale è montata tra l’appendice 11 ed il manicotto 18 coassialmente all’asse 9, ed è interposta tra la testata 10 ed il piattello 26 per spostare, e normalmente mantenere, il piattello 26 a contatto della flangia 19 ed il rullo 24 a contatto di una camma 28 ricavata su una superficie esterna di una porzione intermedia di un albero 29 di trasmissione montato attraverso il foro 6 per ruotare, rispetto alla carcassa 5, attorno all’asse 7. The device 17 also comprises a compression spring 27, which is mounted between the appendix 11 and the sleeve 18 coaxially to the axis 9, and is interposed between the head 10 and the plate 26 to move, and normally maintain, the plate 26 in contact with the flange 19 and the roller 24 in contact with a cam 28 obtained on an external surface of an intermediate portion of a transmission shaft 29 mounted through the hole 6 to rotate, with respect to the casing 5, about the axis 7.
La testata 10 supporta una valvola 30 di aspirazione del combustibile nel cilindro 15 ed una valvola 31 di mandata del combustibile al motore a combustione interna (non illustrato). The head 10 supports a valve 30 for the intake of the fuel in the cylinder 15 and a valve 31 for delivering the fuel to the internal combustion engine (not shown).
Le porzioni 13 e 14 del foro 12 sono collegate fra loro in corrispondenza di uno spallamento 32 anulare definente una sede 33 centrale impegnata in maniera scorrevole da un otturatore 34 della valvola 30. The portions 13 and 14 of the hole 12 are connected to each other at an annular shoulder 32 defining a central seat 33 slidably engaged by an obturator 34 of the valve 30.
L’otturatore 34 viene spostato, e normalmente mantenuto, in una posizione di chiusura (figure 1 e 2) da una molla 35 interposta tra lo spallamento 32 ed un piattello 36 montato sull’otturatore 34 stesso. The shutter 34 is moved, and normally maintained, in a closed position (Figures 1 and 2) by a spring 35 interposed between the shoulder 32 and a plate 36 mounted on the shutter 34 itself.
L’otturatore 34 viene spostato, inoltre, dalla sua posizione di chiusura in una posizione di apertura (non illustrata) contro la spinta della molla 35 da un attuatore 37 elettromagnetico di tipo noto. The shutter 34 is also moved from its closed position to an open position (not shown) against the thrust of the spring 35 by an electromagnetic actuator 37 of a known type.
La valvola 31 è alloggiata all’interno di un condotto 38 di mandata, il quale presenta un asse 39 longitudinale trasversale all’asse 9, comunica con il cilindro 15, ed è collegato in modo noto al motore a combustione interna (non illustrato). 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 way to the internal combustion engine (not shown).
Almeno la sede 33, la porzione 14 ristretta del foro 12, ed il condotto 38 vengono sottoposti ad un trattamento di compressione superficiale e deformazione plastica atto a generare nella testata 10 sollecitazioni di compressione che compensano le sollecitazioni di trazione generate nella testata 10 dall’andamento oscillante della pressione del combustibile all’interno della testata 10 stessa. At least the seat 33, the restricted portion 14 of the hole 12, and the duct 38 are subjected to a surface compression and plastic deformation treatment capable of generating compressive stresses in the head 10 which compensate for the tensile stresses generated in the head 10 by the oscillating of the fuel pressure inside the head 10 itself.
Nella fattispecie, il trattamento di compressione superficiale e deformazione plastica utilizzato è la pallinatura con la quale un getto di particelle, in particolare in fibra di vetro, viene orientato contro la superficie della sede 33, della porzione 14 ristretta del foro 12, e del condotto 38 tramite un flusso di aria compressa o tramite ultrasuoni. In this case, the surface compression and plastic deformation treatment used is shot peening with which a jet of particles, in particular of glass fiber, is oriented against the surface of the seat 33, of the restricted portion 14 of the hole 12, and of the duct 38 by a flow of compressed air or by ultrasound.
Il trattamento di pallinatura consente di limitare il rischio di rottura a fatica della testata 10. The shot peening treatment allows to limit the risk of fatigue breakage of the head 10.
Claims (1)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
| PCT/EP2019/057410 WO2019185531A1 (en) | 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
|---|---|
| IT201800004042A1 true IT201800004042A1 (en) | 2019-09-28 |
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ID=62597962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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 |
Country Status (2)
| Country | Link |
|---|---|
| IT (1) | IT201800004042A1 (en) |
| WO (1) | WO2019185531A1 (en) |
Families Citing this family (1)
| 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)
| 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 |
-
2018
- 2018-03-28 IT IT201800004042A patent/IT201800004042A1/en unknown
-
2019
- 2019-03-25 WO PCT/EP2019/057410 patent/WO2019185531A1/en active Application Filing
Patent Citations (3)
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019185531A1 (en) | 2019-10-03 |
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