IT201900015099A1 - PUMPING GROUP TO FEED FUEL, PREFERABLY DIESEL, TO AN INTERNAL COMBUSTION ENGINE - Google Patents
PUMPING GROUP TO FEED FUEL, PREFERABLY DIESEL, TO AN INTERNAL COMBUSTION ENGINE Download PDFInfo
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- IT201900015099A1 IT201900015099A1 IT102019000015099A IT201900015099A IT201900015099A1 IT 201900015099 A1 IT201900015099 A1 IT 201900015099A1 IT 102019000015099 A IT102019000015099 A IT 102019000015099A IT 201900015099 A IT201900015099 A IT 201900015099A IT 201900015099 A1 IT201900015099 A1 IT 201900015099A1
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- Prior art keywords
- manifold
- pumping unit
- feed
- fuel
- cylinder
- Prior art date
Links
- 239000000446 fuel Substances 0.000 title claims description 42
- 238000005086 pumping Methods 0.000 title claims description 22
- 238000002485 combustion reaction Methods 0.000 title claims description 18
- 239000002283 diesel fuel Substances 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/027—Throttle passages
- F16L55/02781—The regulating element being provided with radial outputs
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- 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
- F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
- F02M37/0041—Means for damping pressure pulsations
-
- 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
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
- F02M59/365—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages valves being actuated by the fluid pressure produced in an auxiliary pump, e.g. pumps with differential pistons; Regulated pressure of supply pump actuating a metering valve, e.g. a sleeve surrounding the pump piston
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- 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
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- 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
- F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
-
- 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
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
- F02M63/0265—Pumps feeding common rails
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- 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
-
- 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
- F04B1/02—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having two 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
- F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
- F04B11/0091—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using a special shape of fluid pass, e.g. throttles, ducts
-
- 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
- F04B23/00—Pumping installations or systems
- F04B23/04—Combinations of two or more pumps
-
- 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
- F04B53/20—Filtering
-
- 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
- F02M2200/27—Fuel-injection apparatus with filters
-
- 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
- F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
- F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Jet Pumps And Other Pumps (AREA)
- Fuel-Injection Apparatus (AREA)
Description
DESCRIZIONE DESCRIPTION
del brevetto per invenzione industriale dal titolo: of the patent for industrial invention entitled:
“GRUPPO DI POMPAGGIO PER ALIMENTARE COMBUSTIBILE, PREFERIBILMENTE GASOLIO, AD UN MOTORE A COMBUSTIONE INTERNA” "PUMPING GROUP TO FEED FUEL, PREFERABLY DIESEL OIL, TO AN INTERNAL COMBUSTION ENGINE"
La presente invenzione è relativa ad un gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna. The present invention relates to a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine.
In particolare, la presente invenzione è relativa ad un gruppo di pompaggio del tipo comprendente una pompa di alta pressione, per esempio una pompa a pistoni, atta ad alimentare il combustibile ad un motore a combustione interna; una pompa di pre-alimentazione, per esempio una pompa ad ingranaggi, atta ad alimentare il combustibile da un serbatoio di contenimento alla pompa a pistoni; ed un circuito idraulico per collegare fra loro il serbatoio di contenimento, la pompa di pre-alimentazione, la pompa di alta pressione, ed il motore a combustione interna. In particular, the present invention relates to a pumping unit of the type comprising a high pressure pump, for example a piston pump, suitable for supplying fuel to an internal combustion engine; a pre-feed pump, for example a gear pump, adapted to feed fuel from a containment tank to the piston pump; and a hydraulic circuit to connect together the containment tank, the pre-feed pump, the high pressure pump, and the internal combustion engine.
Nella fattispecie, la pompa a pistoni comprende un corpo pompa; almeno due cilindri ricavati nel corpo pompa ed impegnati in maniera scorrevole da rispettivi pistoni; ed un dispositivo di azionamento per spostare i pistoni lungo i relativi cilindri con un moto rettilineo alternativo comprendente una corsa di aspirazione del combustibile nei cilindri ed una corsa di mandata del combustibile al motore a combustione interna. In this case, the piston pump comprises a pump body; at least two cylinders formed in the pump body and slidingly engaged by respective pistons; and an actuation device for moving the pistons along the relative cylinders with a reciprocating rectilinear motion comprising a stroke of intake of the fuel in the cylinders and a stroke of delivery of the fuel to the internal combustion engine.
Ciascun cilindro è associato ad una valvola di aspirazione del combustibile nel cilindro e ad una valvola di mandata del combustibile al motore a combustione interna. Each cylinder is associated with a fuel intake valve in the cylinder and with a fuel delivery valve to the internal combustion engine.
Il dispositivo di azionamento è configurato in modo da spostare contemporaneamente un pistone con la sua corsa di aspirazione e l’altro pistone con la sua corsa di mandata. The actuation device is configured in such a way as to simultaneously move a piston with its suction stroke and the other piston with its delivery stroke.
Il circuito idraulico comprende un primo ramo per collegare fra loro il serbatoio di contenimento e la pompa ad ingranaggi; un secondo ramo per collegare fra loro la pompa ad ingranaggi e la pompa a pistoni; ed un terzo ramo per collegare fra loro la pompa a pistoni ed il motore a combustione interna. The hydraulic circuit comprises a first branch for connecting the containment tank and the gear pump to each other; a second branch for connecting the gear pump and the piston pump together; and a third branch for connecting the piston pump and the internal combustion engine together.
Il secondo ramo comprende un collettore di alimentazione e, per ciascun cilindro, un rispettivo condotto di aspirazione per collegare il collettore di alimentazione con il cilindro stesso. The second branch comprises a feed manifold and, for each cylinder, a respective intake duct for connecting the feed manifold with the cylinder itself.
Generalmente, il circuito idraulico comprende, inoltre, una elettrovalvola di dosaggio montata lungo il collettore di alimentazione per controllare selettivamente la portata istantanea di combustibile alimentata alla pompa a pistoni in funzione dei valori di una pluralità di parametri di funzionamento del motore a combustione interna. Generally, the hydraulic circuit also comprises a metering solenoid valve mounted along the supply manifold to selectively control the instantaneous flow rate of fuel supplied to the piston pump as a function of the values of a plurality of operating parameters of the internal combustion engine.
L’elettrovalvola di dosaggio comprende un corpo valvola montato nel collettore di alimentazione, ed un otturatore impegnato in maniera scorrevole nel corpo valvola per spostarsi tra una posizione di apertura ed una posizione di chiusura dell’elettrovalvola di dosaggio stessa. The dosing solenoid valve includes a valve body mounted in the supply manifold, and a shutter engaged in a sliding manner in the valve body to move between an open position and a closed position of the dosing solenoid valve itself.
In uso, la corsa di mandata di ciascun pistone comanda la chiusura della relativa valvola di aspirazione. Durante la chiusura di ciascuna valvola di aspirazione, una parte del combustibile compresso dal relativo pistone fuoriesce dal relativo cilindro in primo luogo lungo il relativo condotto di aspirazione e, quindi, sia lungo il condotto di aspirazione dell’altra valvola di aspirazione, sia lungo il collettore di alimentazione. In use, the delivery stroke of each piston commands the closing of the relative intake valve. During the closing of each intake valve, a part of the fuel compressed by the relative piston exits from the relative cylinder firstly along the relative intake duct and, then, both along the intake duct of the other intake valve, and along the power supply manifold.
I gruppi di pompaggio noti del tipo sopra descritto presentano alcuni inconvenienti principalmente discendenti dal fatto che: Known pumping units of the type described above have some drawbacks mainly deriving from the fact that:
le onde di pressione generate lungo il condotto di aspirazione di ciascun cilindro dalla fuoriuscita di combustibile dall’altro cilindro favoriscono l’apertura, e quindi ritardano ulteriormente la chiusura, della relativa valvola di aspirazione amplificando il fenomeno appena descritto; e the pressure waves generated along the intake duct of each cylinder by the fuel leaking from the other cylinder favor the opening, and therefore further delay the closure, of the relative intake valve, amplifying the phenomenon just described; And
le onde di pressione generate lungo il collettore di alimentazione dalla fuoriuscita di combustibile dai due cilindri favoriscono l’apertura dell’otturatore della elettrovalvola di dosaggio compromettendo l’alimentazione della corretta portata di combustibile alla pompa a pistoni e, quindi, al motore a combustione interna. the pressure waves generated along the supply manifold by the fuel leaking from the two cylinders favor the opening of the shutter of the metering solenoid valve, compromising the supply of the correct fuel flow to the piston pump and, therefore, to the internal combustion engine .
Scopo della presente invenzione è di realizzare 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 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 realizzato 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 pumping unit is provided 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 uno schema idraulico di una preferita forma di attuazione del gruppo di pompaggio della presente invenzione; Figure 1 is a hydraulic diagram of a preferred embodiment of the pumping unit of the present invention;
la figura 2 è una vista schematica in sezione, con parti asportate per chiarezza, di un particolare del gruppo di pompaggio della figura 1; e Figure 2 is a schematic sectional view, with parts removed for clarity, of a detail of the pumping unit of Figure 1; And
la figura 3 è una vista prospettica di un particolare della figura 2. Figure 3 is a perspective view of a detail of Figure 2.
Con riferimento alla figura 1, con 1 è indicato, nel suo complesso, un gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, da un serbatoio 2 di contenimento ad un motore 3 a combustione interna, nella fattispecie un motore a scoppio Diesel. With reference to Figure 1, the number 1 indicates, as a whole, a pumping unit for feeding fuel, preferably diesel oil, from a containment tank 2 to an internal combustion engine 3, in this case a Diesel internal combustion engine.
Il motore 3 comprende un collettore 4 di distribuzione del combustibile, comunemente indicato con il termine di “common rail”, ed una pluralità di iniettori 5 collegati con il collettore 4 ed atti a nebulizzare il combustibile all’interno di relative camere di combustione (non illustrate) del motore 3 stesso. The engine 3 comprises a fuel distribution manifold 4, commonly indicated with the term "common rail", and a plurality of injectors 5 connected to the manifold 4 and adapted to atomize the fuel inside the relative combustion chambers (not illustrated) of the motor 3 itself.
Il gruppo di pompaggio 1 comprende una pompa 6 di alta pressione, vale a dire una pompa a pistoni, per alimentare il combustibile al motore 3; ed una pompa 7 di bassa pressione o pre-alimentazione, vale a dire una pompa ad ingranaggi, per esempio ad azionamento elettrico, per alimentare il combustibile dal serbatoio 2 alla pompa 6. The pumping unit 1 comprises a high pressure pump 6, ie a piston pump, for supplying fuel to the engine 3; and a low pressure or pre-feed pump 7, i.e. a gear pump, for example electrically operated, to feed the fuel from the tank 2 to the pump 6.
La pompa 6 comprende un corpo pompa 8 e, nella fattispecie, due cilindri 9, i quali sono ricavati nel corpo pompa 8, e presentano rispettivi assi 10 longitudinali sostanzialmente paralleli fra loro. The pump 6 comprises a pump body 8 and, in this case, two cylinders 9, which are formed in the pump body 8, and have respective longitudinal axes 10 substantially parallel to each other.
Secondo una variante non illustrata, il numero di cilindri 9 è diverso da due, in particolare pari ad uno, e gli assi 10 non sono paralleli fra loro. According to a variant not shown, the number of cylinders 9 is different from two, in particular equal to one, and the axes 10 are not parallel to each other.
I cilindri 9 sono impegnati in maniera scorrevole da rispettivi pistoni 11 mobili, sotto la spinta di un dispositivo 12 di azionamento, con un moto rettilineo alternativo comprendente una corsa di aspirazione del combustibile nei relativi cilindri 9 ed una corsa di mandata del combustibile al motore 3. The cylinders 9 are engaged in a sliding manner by respective movable pistons 11, under the thrust of an actuation device 12, with a reciprocating rectilinear motion comprising an intake stroke of the fuel in the relative cylinders 9 and a stroke of delivery of the fuel to the engine 3 .
Il dispositivo 12 comprende un albero 13 di trasmissione a camme, il quale è alloggiato in una prima camera 14 di contenimento ricavata nel corpo pompa 8, ed è atto a spostare i pistoni 11 con la loro corsa di mandata. The device 12 comprises a cam transmission shaft 13, which is housed in a first containment chamber 14 obtained in the pump body 8, and is adapted to move the pistons 11 with their delivery stroke.
Il dispositivo 12 comprende, inoltre, per ciascun pistone 11, una rispettiva molla (non illustrata), la quale è alloggiata in una seconda camera di contenimento (non illustrata) ricavata nel corpo pompa 8, ed è atta a spostare il pistone 11 stesso con la sua corsa di aspirazione. The device 12 also comprises, for each piston 11, a respective spring (not shown), which is housed in a second containment chamber (not shown) obtained in the pump body 8, and is adapted to move the piston 11 itself with its suction stroke.
A proposito di quanto sopra esposto è opportuno precisare che l’albero 13 è configurato in modo da spostare contemporaneamente un pistone 11 con la sua corsa di aspirazione e l’altro pistone 11 con la sua corsa di mandata. Regarding the above, it should be noted that the shaft 13 is configured in such a way as to simultaneously move a piston 11 with its suction stroke and the other piston 11 with its delivery stroke.
Il gruppo di pompaggio 1 comprende, inoltre, un circuito 15 idraulico comprendente, a sua volta, un primo ramo 16 per collegare fra loro il serbatoio 2 e la pompa 7; un secondo ramo 17 per collegare fra loro la pompa 7 e la pompa 6; ed un terzo ramo 18 per collegare fra loro la pompa 6 ed il collettore 4. The pumping unit 1 also comprises a hydraulic circuit 15 comprising, in turn, a first branch 16 for connecting the tank 2 and the pump 7 together; a second branch 17 for connecting pump 7 and pump 6 together; and a third branch 18 to connect the pump 6 and the manifold 4 together.
Il ramo 17 è provvisto di un dispositivo 19 di filtraggio per filtrare il combustibile alimentato ai cilindri 9, e presenta, inoltre, una elettrovalvola 20 di dosaggio montata a valle del dispositivo 19 in una direzione 21 di avanzamento del combustibile lungo il ramo 17 per controllare selettivamente la portata istantanea di combustibile alimentata alla pompa 6 in funzione dei valori di una pluralità di parametri di funzionamento del motore 3. The branch 17 is provided with a filtering device 19 for filtering the fuel fed to the cylinders 9, and also has a metering solenoid valve 20 mounted downstream of the device 19 in a direction 21 for the advancement of the fuel along the branch 17 to control selectively the instantaneous flow rate of fuel supplied to the pump 6 as a function of the values of a plurality of operating parameters of the engine 3.
Il ramo 17 ed il ramo 18 sono collegati a ciascun cilindro 9 tramite una valvola 22 di aspirazione e, rispettivamente, una valvola 23 di mandata. The branch 17 and the branch 18 are connected to each cylinder 9 by means of an intake valve 22 and, respectively, a delivery valve 23.
Il circuito 15 comprende, inoltre, un quarto ramo 24, il quale si estende tra il collettore 4 ed il ramo 16, e consente di scaricare nel ramo 16 la portata di combustibile eccedente quella necessaria agli iniettori 5; ed un quinto ramo 25, il quale si estende tra il ramo 17 ed il ramo 16, ed è collegato al ramo 17 a valle della elettrovalvola 20 nella direzione 21 per alimentare all’ingresso della pompa 7 il combustibile trafilante attraverso l’elettrovalvola 20 quando l’elettrovalvola 20 stessa è chiusa. The circuit 15 also comprises a fourth branch 24, which extends between the manifold 4 and the branch 16, and allows the flow of fuel in excess of that necessary for the injectors 5 to be discharged into the branch 16; and a fifth branch 25, which extends between the branch 17 and the branch 16, and is connected to the branch 17 downstream of the solenoid valve 20 in the direction 21 to feed the fuel leaking through the solenoid valve 20 to the inlet of the pump 7 when the solenoid valve 20 itself is closed.
Il circuito 15 presenta, inoltre, un sesto ramo 26, il quale si estende tra il ramo 17 ed il ramo 24, è collegato al ramo 17 a monte della elettrovalvola 20 nella direzione 21, ed è provvisto di un dispositivo 27 valvolare. The circuit 15 also has a sixth branch 26, which extends between the branch 17 and the branch 24, is connected to the branch 17 upstream of the solenoid valve 20 in the direction 21, and is provided with a valve device 27.
Il dispositivo 27 è configurato per controllare l’alimentazione nel corpo pompa 8 e nella camera 14 della portata di combustibile utilizzata per lubrificare l’albero 13 di trasmissione a camme e della portata di combustibile eccedente quella alimentata attraverso l’elettrovalvola 20. The device 27 is configured to control the supply in the pump body 8 and in the chamber 14 of the fuel flow used to lubricate the cam transmission shaft 13 and the fuel flow in excess of that fed through the solenoid valve 20.
Il circuito 15 comprende, infine, un settimo ramo 28 per alimentare nel ramo 26 e, quindi, nel serbatoio 2 il combustibile trafilante attraverso il corpo pompa 8. Finally, the circuit 15 comprises a seventh branch 28 to feed the fuel flowing through the pump body 8 into the branch 26 and, therefore, into the tank 2.
Secondo quanto illustrato nella figura 2, il ramo 17 comprende un collettore 29 di alimentazione e, per ciascun cilindro 9, un rispettivo condotto 30 di aspirazione per collegare il collettore 29 con il cilindro 9 stesso. As illustrated in Figure 2, the branch 17 comprises a supply manifold 29 and, for each cylinder 9, a respective intake duct 30 for connecting the manifold 29 with the cylinder 9 itself.
L’elettrovalvola 20 di dosaggio comprende un corpo valvola 31 di forma tubolare, il quale è montato nel collettore 29 coassialmente ad un asse 32 longitudinale del collettore 29 stesso, e presenta un canale 33 di ingresso di forma anulare, che si estende attorno all’asse 32, e comunica con il ramo 17 per alimentare il combustibile attraverso il corpo valvola 31. The metering solenoid valve 20 comprises a tubular-shaped valve body 31, which is mounted in the manifold 29 coaxially to a longitudinal axis 32 of the manifold 29 itself, and has an annular-shaped inlet channel 33, which extends around the axis 32, and communicates with the branch 17 to feed the fuel through the valve body 31.
Il corpo valvola 31 è impegnato in maniera scorrevole da un otturatore 34, il quale presenta una forma a tazza, è limitato assialmente da una parete 35 di fondo disposta perpendicolarmente all’asse 32, ed è provvisto di una pluralità di fori 36 di collegamento distribuiti attorno all’asse 32 stesso. The valve body 31 is slidably engaged by a shutter 34, which has a cup shape, is limited axially by a bottom wall 35 arranged perpendicular to the axis 32, and is provided with a plurality of distributed connection holes 36 around axis 32 itself.
L’otturatore 34 è mobile tra una posizione di apertura, in cui i fori 36 sono allineati radialmente al canale 33, ed una posizione di chiusura, in cui i fori 36 sono assialmente sfalsati rispetto al canale 33 stesso. The shutter 34 is movable between an opening position, in which the holes 36 are aligned radially with the channel 33, and a closing position, in which the holes 36 are axially offset with respect to the channel 33 itself.
L’otturatore 34 viene spostato, e normalmente mantenuto, nella sua posizione di apertura da una molla 37, e viene spostato dalla sua posizione di apertura nella sua posizione di chiusura contro l’azione della molla 37 da un attuatore 38 elettromagnetico di tipo noto impegnato sulla parete 35. The shutter 34 is moved, and normally maintained, in its open position by a spring 37, and is moved from its open position to its closed position against the action of the spring 37 by an electromagnetic actuator 38 of a known type engaged on wall 35.
Il collettore 29 alloggia al proprio interno un cannotto 39 tubolare, il quale è montato coassialmente all’asse 32, presenta due estremità libere assialmente aperte, e presenta, nella fattispecie, tre manicotti 40 allargati e due tratti 41 ristretti disposti tra i manicotti 40 stessi. The manifold 29 houses inside a tubular sleeve 39, which is mounted coaxially to the axis 32, has two free axially open ends, and has, in this case, three enlarged sleeves 40 and two narrow sections 41 arranged between the sleeves 40 themselves. .
I manicotti 40 presentano un diametro sostanzialmente pari ad un diametro del collettore 29, sono impegnati in maniera scorrevole nel collettore 29, e sono disposti due (nel seguito indicati con 40a e 40b) da bande opposte dei condotti 30 ed uno (nel seguito indicato con 40c) tra i condotti 30 stessi. The sleeves 40 have a diameter substantially equal to a diameter of the manifold 29, are slidingly engaged in the manifold 29, and are arranged two (hereinafter indicated with 40a and 40b) on opposite bands of the ducts 30 and one (hereinafter indicated with 40c) between the ducts 30 themselves.
I tratti 41 presentano un diametro minore del diametro del collettore 29, e sono limitati, ciascuno, da una rispettiva parete 42 laterale sostanzialmente coassiale all’asse 32. The sections 41 have a diameter smaller than the diameter of the manifold 29, and are each limited by a respective lateral wall 42 substantially coaxial to the axis 32.
Ciascun tratto 41 è provvisto di una pluralità di fori 43 di alimentazione, i quali sono ricavati attraverso la relativa parete 42, sono distribuiti attorno all’asse 32, e presentano rispettivi assi longitudinali (non illustrati) preferibilmente radiali e trasversali all’asse 32 stesso. Each section 41 is provided with a plurality of feed holes 43, which are obtained through the relative wall 42, are distributed around the axis 32, and have respective longitudinal axes (not shown) preferably radial and transverse to the axis 32 itself. .
Ciascun foro 43 presenta una sezione trasversale di passaggio del combustibile minore di una sezione trasversale di passaggio del combustibile lungo il cannotto 39. Each hole 43 has a cross section for the passage of the fuel which is smaller than a cross section for the passage of fuel along the tube 39.
In uso, i manicotti 40a, 40b, 40c obbligano il combustibile proveniente da ciascun condotto 30 durante la chiusura della relativa valvola 22 di aspirazione ad attraversare i fori 43 del relativo tratto 41. Di conseguenza, le onde di pressione generate nel collettore 29 dal combustibile proveniente dai condotti 30 durante la chiusura delle relative valvole 22 di aspirazione vengono smorzate dall’attraversamento dei fori 43. In use, the sleeves 40a, 40b, 40c force the fuel coming from each duct 30 during the closing of the relative intake valve 22 to pass through the holes 43 of the relative section 41. Consequently, the pressure waves generated in the manifold 29 by the fuel coming from the ducts 30 during the closing of the relative intake valves 22 are damped by passing through the holes 43.
Lo smorzamento delle onde di pressione generate nel collettore 29 dalla chiusura delle valvole 22 presenta alcuni vantaggi principalmente discendenti dal fatto che le onde di pressione nel collettore 29 sono relativamente ridotte e non compromettono il corretto comportamento dinamico delle valvole 22 e dell’otturatore 34 dell’elettrovalvola 20 di dosaggio. The damping of the pressure waves generated in the manifold 29 by the closure of the valves 22 has some advantages mainly deriving from the fact that the pressure waves in the manifold 29 are relatively small and do not compromise the correct dynamic behavior of the valves 22 and of the shutter 34 of the dosing solenoid valve 20.
Ovviamente, il cannotto 39 può essere eliminato e sostituito, per esempio, con due elementi schermanti montati all’ingresso dei condotti 30 e provvisti dei fori 43. Obviously, the sleeve 39 can be eliminated and replaced, for example, with two shielding elements mounted at the inlet of the ducts 30 and provided with holes 43.
Claims (1)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT102019000015099A IT201900015099A1 (en) | 2019-08-27 | 2019-08-27 | PUMPING GROUP TO FEED FUEL, PREFERABLY DIESEL, TO AN INTERNAL COMBUSTION ENGINE |
PCT/EP2020/073729 WO2021037842A1 (en) | 2019-08-27 | 2020-08-25 | Pump unit for feeding fuel, preferably diesel, to an internal- combustion engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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IT102019000015099A IT201900015099A1 (en) | 2019-08-27 | 2019-08-27 | PUMPING GROUP TO FEED FUEL, PREFERABLY DIESEL, TO AN INTERNAL COMBUSTION ENGINE |
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IT201900015099A1 true IT201900015099A1 (en) | 2021-02-27 |
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IT102019000015099A IT201900015099A1 (en) | 2019-08-27 | 2019-08-27 | PUMPING GROUP TO FEED FUEL, PREFERABLY DIESEL, TO AN INTERNAL COMBUSTION ENGINE |
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IT (1) | IT201900015099A1 (en) |
WO (1) | WO2021037842A1 (en) |
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IT202200002849A1 (en) * | 2022-02-16 | 2023-08-16 | Bosch Gmbh Robert | FUEL PUMP ASSEMBLY FOR AN INTERNAL COMBUSTION ENGINE |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5701873A (en) * | 1993-11-08 | 1997-12-30 | Eidgenoessische Technische Hochschule Laboratorium Fuer Verbrennungsmotoren Und Verbrennungstechnik | Control device for a filling-ratio adjusting pump |
DE19735437A1 (en) * | 1996-08-24 | 1998-02-26 | Volkswagen Ag | Fuel distribution gallery in internal combustion engine |
DE19806595A1 (en) * | 1998-02-18 | 1999-08-19 | Volkswagen Ag | Device for distribution of fuel in multi-cylinder internal combustion engine with one cylinder head |
DE102016205427A1 (en) * | 2016-04-01 | 2017-10-05 | Robert Bosch Gmbh | Pressure damping device for a fluid pump, in particular for a high pressure pump of a fuel injection system |
WO2019158302A1 (en) * | 2018-02-15 | 2019-08-22 | Robert Bosch Gmbh | Pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine |
-
2019
- 2019-08-27 IT IT102019000015099A patent/IT201900015099A1/en unknown
-
2020
- 2020-08-25 WO PCT/EP2020/073729 patent/WO2021037842A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5701873A (en) * | 1993-11-08 | 1997-12-30 | Eidgenoessische Technische Hochschule Laboratorium Fuer Verbrennungsmotoren Und Verbrennungstechnik | Control device for a filling-ratio adjusting pump |
DE19735437A1 (en) * | 1996-08-24 | 1998-02-26 | Volkswagen Ag | Fuel distribution gallery in internal combustion engine |
DE19806595A1 (en) * | 1998-02-18 | 1999-08-19 | Volkswagen Ag | Device for distribution of fuel in multi-cylinder internal combustion engine with one cylinder head |
DE102016205427A1 (en) * | 2016-04-01 | 2017-10-05 | Robert Bosch Gmbh | Pressure damping device for a fluid pump, in particular for a high pressure pump of a fuel injection system |
WO2019158302A1 (en) * | 2018-02-15 | 2019-08-22 | Robert Bosch Gmbh | Pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine |
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WO2021037842A1 (en) | 2021-03-04 |
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