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WO2009141188A1 - Method and system for feeding fuel to an internal combustion engine - Google Patents

Method and system for feeding fuel to an internal combustion engine Download PDF

Info

Publication number
WO2009141188A1
WO2009141188A1 PCT/EP2009/053495 EP2009053495W WO2009141188A1 WO 2009141188 A1 WO2009141188 A1 WO 2009141188A1 EP 2009053495 W EP2009053495 W EP 2009053495W WO 2009141188 A1 WO2009141188 A1 WO 2009141188A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
branch
bearing
feeding
pressure pump
Prior art date
Application number
PCT/EP2009/053495
Other languages
French (fr)
Inventor
Angelo Antonacci
Alessandro Italiano
Ricardo Cardoso
Nello Medoro
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 WO2009141188A1 publication Critical patent/WO2009141188A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to a method for cooling a bearing of a high- pressure fuel pump for an internal combustion engine.
  • the present invention relates to a method for feeding fuel to an internal combustion engine, which comprises the steps of feeding the fuel to at least one pumping member of a high-pressure pump via a first branch of the feed circuit, and feeding part of the fuel to a chamber of the high-pressure pump containing a mechanism for actuating the pumping member via a second branch of the feed circuit.
  • the high-pressure pump comprises a pump body inside which the said chamber is defined, while the actuating mechanism is arranged, at least partly, inside this chamber and comprises a shaft rotating about a given axis.
  • the said actuating mechanism imparts a reciprocating movement to the pumping member.
  • the said bearing in particular a friction bearing, supports the actuating mechanism, in particular supports the shaft rotationally about the given axis.
  • the high-pressure pump forms part of a feed system which also comprises a feed circuit which connects a tank to the high-pressure pump, and a delivery circuit which connects the high-pressure pump to a common rail which distributes the fuel at a pressure higher than 2000 bar among a group of injectors.
  • Part of the fuel is directly fed by the feed circuit to the chamber containing the actuating mechanism in order to lubricate the actuating mechanism. Since the friction bearing is adjacent to the said chamber, the fuel circulating inside the said chamber penetrates, partly, into the passage formed between the shaft and the friction bearing in order to lubricate and at the same time cool the said bearing.
  • the recorded data has shown that the robustness of the friction bearing is inversely proportional to the temperature.
  • the fuel contained inside the chamber and the chamber itself containing the actuating mechanism are relatively hot owing to seepage of the fuel between piston and cylinder.
  • the pressure of the fuel inside the cylinder is more than 2000 bar. Consequently, the fuel contained inside the chamber has a low cooling capacity and, at the same time, a low lubricating capacity.
  • the present invention relates to a method for feeding fuel to an internal combustion engine, the method comprising the steps of feeding the fuel to at least one pumping member of a high-pressure pump via a first branch of a feed circuit, feeding part of the fuel to a chamber of the high- pressure pump containing a mechanism for actuating the pumping member via a second branch of the feed circuit, the method being characterized by feeding part of the fuel to a bearing supporting the actuating mechanism via a third branch of the feed circuit so as to cool the bearing.
  • part of the fuel is used in order to cool the bearing.
  • a further object of the present invention is to provide a system for feeding fuel to an internal combustion engine.
  • the present invention relates to a system for feeding fuel to an internal combustion engine, the system comprising a high- pressure fuel pump and a circuit for feeding fuel to the high-pressure pump, the high-pressure pump comprising at least one pumping member, a mechanism for actuating the pumping member, arranged inside a chamber, and a bearing for supporting, at least partly, the actuating mechanism, the feed circuit comprising a first branch for feeding fuel to the pumping member and a second branch for feeding the fuel to the chamber, the method being characterized in that it comprises at least one third branch for feeding the fuel to the bearing so as to cool the bearing.
  • FIG. 1 is a diagram of a system for feeding fuel to an internal combustion engine, provided according to the present invention.
  • FIG. 2 is a cross-sectional view, with parts removed for the sake of clarity, of a detail of the high-pressure pump of the feed system shown in Figure 1.
  • the reference number 1 denotes a system for feeding fuel to an internal combustion engine not shown in the accompanying drawings.
  • the system 1 comprises a high-pressure pump 2 which comprises a pump body 3 and three pumping members 4, a low-pressure feed circuit 5 which connects a tank 6 to the high-pressure pump 2, a high-pressure delivery circuit 7 which connects the high-pressure pump 2 to a common rail (not shown in the accompanying figures), and a discharge circuit 8 for discharging the excess fuel into the tank 6.
  • Each pumping member 4 is defined by a cylinder 9 inside which a piston 10 slides with a reciprocating movement.
  • Each cylinder 9 communicates with the feed circuit 6 via a feed valve 11 and communicates with the delivery circuit 7 via a delivery valve 12.
  • the three pumping members 4 are arranged radially at 120° with respect to a shaft 13 which forms part of a mechanism 14 for actuating the three said pumping members, i.e. in this case three pistons 10.
  • the actuating mechanism 14 comprises essentially, in addition to the shaft 13, a cam 15 which is integral with the shaft 13 rotatable in a known manner relative to the pump body 3, and a prismatic ring 16 which is mounted rotatably about the cam 15 and has three smooth faces 17 against each of which a respective piston 10 is pushed by means of a spring not shown in the accompanying figures.
  • the actuating mechanism 14 is housed inside a chamber 18 formed in the pump body 2 which comprises a hole 19 inside which a bearing 20, in particular a friction bearing, is force-fitted, said bearing having the function of supporting, at least partly, the shaft 13 as illustrated more clearly in Figure 2.
  • the feed circuit 5 extends, partly, inside the pump body 2, partly over a flange 21 which is connected to the pump body 2 and forms an integral part of the high-pressure pump 2, and, partly, along pipes.
  • the feed circuit 5 comprises a branch 22 which extends between the tank 6 and the flange 21 and along which a pre-filter 23, a pre-feed pump 24, a filter 25 and a second pre-feed pump 26 are arranged in succession.
  • the feed circuit 5 comprises two branches 27 and 28 which extend from the branch 22 and are designed, respectively, to feed the fuel to the pumping members 4 and to feed the chamber 18 and cool the bearing 20.
  • the feed circuit 5 comprises a metering solenoid valve 29 arranged along the branch 27 and an overflow valve 30 arranged along the branch 28.
  • the branch 27 is connected to a branch 31 for connection to the feed valves 11 of each pumping member 4.
  • the feed circuit 5 comprises a further outlet branch 32 from the overflow valve, which feeds the fuel to the bearing 20, in particular to a ring 33 arranged around the bearing 20.
  • the feed circuit 5 is completed by a branch 35 which is arranged in parallel with the overflow valve 30 and along which a choke 36 is arranged.
  • the delivery circuit 7 comprises a collector branch 37 connected to the delivery valves 12 and a branch 38 connected to the common rail not shown in the accompanying figures.
  • the discharge circuit 8 comprises a branch 39 which is connected to the tank 6 and designed to collect the excess fuel of the entire system 1, a branch 40 which connects the chamber 18 to the branch 39, and a branch 34 which connects the ring 33 to the branch 22 upstream of the pre-feed pump 26.
  • the branch 34 is connected to the branch 40.
  • Figure 2 shows, partly, the high-pressure pump 2 designed to compress the fuel to pressures in the region of 2000 bar and having a chamber 18 defined inside the pump body 3.
  • the chamber 18 is designed to house the actuating mechanism 14 (of which only the shaft 13, rotatable about an axis A, is shown in broken lines in Figure 2).
  • the pump body 3 has an annular wall 42 with, formed therein, the three cylinders 9 (only two of which are shown in Figure 2) and three service openings 43 (only two of which are shown in Figure 2) closed by respective plates 44, only one of which is shown in Figure 2.
  • the pump body 3 comprises a high-thickness wall 45 which extends perpendicularly with respect to the axis A, is adjacent to the wall 42 and has the hole 19 situated along the axis A for housing the shaft 13.
  • the chamber 18 is closed by the flange 21 (not shown in Figure 2) mounted on the pump body 3 along the opposite side of the wall 45.
  • the hole 19 is delimited by an inner surface 46 extending around the axis A.
  • the friction bearing 20 has substantially a cylindrical wall with an outer surface 47 and a ground inner surface 48 rotatably engaged with the shaft 13.
  • the bearing 20 is fixed with an interference fit inside the hole 19.
  • the branches 32 and 42 are defined by respective holes formed in the wall 45, while the ring 33 which extends around the bearing 20 is defined by a groove formed in the wall 45 along the inner surface 46 of the hole 19.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

A method for feeding fuel to an internal combustion engine provides feeding the fuel to at least one pumping member (4) of a high-pressure pump (2) via a first branch (27) of a feed circuit (5); feeding part of the fuel to a chamber (18) of the high-pressure pump (2) containing a mechanism (14) for actuating the pumping member (4) via a second branch (28) of the feed circuit (5); and feeding part of the fuel to a bearing (20) supporting the actuating mechanism (14) via a third branch (32) of the feed cicuit (5) so as to cool the bearing (20).

Description

Description
Title
METHOD AND SYSTEM FOR FEEDING FU EL TO AN INTERNAL
COMBUSTION ENGINE
The present invention relates to a method for cooling a bearing of a high- pressure fuel pump for an internal combustion engine.
In particular, the present invention relates to a method for feeding fuel to an internal combustion engine, which comprises the steps of feeding the fuel to at least one pumping member of a high-pressure pump via a first branch of the feed circuit, and feeding part of the fuel to a chamber of the high-pressure pump containing a mechanism for actuating the pumping member via a second branch of the feed circuit.
Generally, the high-pressure pump comprises a pump body inside which the said chamber is defined, while the actuating mechanism is arranged, at least partly, inside this chamber and comprises a shaft rotating about a given axis. The said actuating mechanism imparts a reciprocating movement to the pumping member. The said bearing, in particular a friction bearing, supports the actuating mechanism, in particular supports the shaft rotationally about the given axis.
The high-pressure pump forms part of a feed system which also comprises a feed circuit which connects a tank to the high-pressure pump, and a delivery circuit which connects the high-pressure pump to a common rail which distributes the fuel at a pressure higher than 2000 bar among a group of injectors.
Part of the fuel is directly fed by the feed circuit to the chamber containing the actuating mechanism in order to lubricate the actuating mechanism. Since the friction bearing is adjacent to the said chamber, the fuel circulating inside the said chamber penetrates, partly, into the passage formed between the shaft and the friction bearing in order to lubricate and at the same time cool the said bearing.
The recorded data has shown that the robustness of the friction bearing is inversely proportional to the temperature. The fuel contained inside the chamber and the chamber itself containing the actuating mechanism are relatively hot owing to seepage of the fuel between piston and cylinder. In this connection it should be remembered that the pressure of the fuel inside the cylinder is more than 2000 bar. Consequently, the fuel contained inside the chamber has a low cooling capacity and, at the same time, a low lubricating capacity.
It is an object of the present invention to provide a method for cooling a bearing of a high-pressure fuel pump for an internal combustion engine, which does not have the drawbacks of the known art and which, at the same time, is low-cost and reliable.
In accordance with these objects, the present invention relates to a method for feeding fuel to an internal combustion engine, the method comprising the steps of feeding the fuel to at least one pumping member of a high-pressure pump via a first branch of a feed circuit, feeding part of the fuel to a chamber of the high- pressure pump containing a mechanism for actuating the pumping member via a second branch of the feed circuit, the method being characterized by feeding part of the fuel to a bearing supporting the actuating mechanism via a third branch of the feed circuit so as to cool the bearing.
In this way, part of the fuel is used in order to cool the bearing.
A further object of the present invention is to provide a system for feeding fuel to an internal combustion engine.
In accordance with these objects, the present invention relates to a system for feeding fuel to an internal combustion engine, the system comprising a high- pressure fuel pump and a circuit for feeding fuel to the high-pressure pump, the high-pressure pump comprising at least one pumping member, a mechanism for actuating the pumping member, arranged inside a chamber, and a bearing for supporting, at least partly, the actuating mechanism, the feed circuit comprising a first branch for feeding fuel to the pumping member and a second branch for feeding the fuel to the chamber, the method being characterized in that it comprises at least one third branch for feeding the fuel to the bearing so as to cool the bearing.
Further characteristic features and advantages of the present invention will emerge clearly from the following description of a non-limiting example of embodiment thereof, with reference to the figures of the accompanying drawings in which:
- Figure 1 is a diagram of a system for feeding fuel to an internal combustion engine, provided according to the present invention; and
- Figure 2 is a cross-sectional view, with parts removed for the sake of clarity, of a detail of the high-pressure pump of the feed system shown in Figure 1.
In Figure 1 the reference number 1 denotes a system for feeding fuel to an internal combustion engine not shown in the accompanying drawings. The system 1 comprises a high-pressure pump 2 which comprises a pump body 3 and three pumping members 4, a low-pressure feed circuit 5 which connects a tank 6 to the high-pressure pump 2, a high-pressure delivery circuit 7 which connects the high-pressure pump 2 to a common rail (not shown in the accompanying figures), and a discharge circuit 8 for discharging the excess fuel into the tank 6.
Each pumping member 4 is defined by a cylinder 9 inside which a piston 10 slides with a reciprocating movement. Each cylinder 9 communicates with the feed circuit 6 via a feed valve 11 and communicates with the delivery circuit 7 via a delivery valve 12.
The three pumping members 4 are arranged radially at 120° with respect to a shaft 13 which forms part of a mechanism 14 for actuating the three said pumping members, i.e. in this case three pistons 10. The actuating mechanism 14 comprises essentially, in addition to the shaft 13, a cam 15 which is integral with the shaft 13 rotatable in a known manner relative to the pump body 3, and a prismatic ring 16 which is mounted rotatably about the cam 15 and has three smooth faces 17 against each of which a respective piston 10 is pushed by means of a spring not shown in the accompanying figures.
The actuating mechanism 14 is housed inside a chamber 18 formed in the pump body 2 which comprises a hole 19 inside which a bearing 20, in particular a friction bearing, is force-fitted, said bearing having the function of supporting, at least partly, the shaft 13 as illustrated more clearly in Figure 2.
With reference to Figure 1, the feed circuit 5 extends, partly, inside the pump body 2, partly over a flange 21 which is connected to the pump body 2 and forms an integral part of the high-pressure pump 2, and, partly, along pipes.
With reference to Figure 1 the feed circuit 5 comprises a branch 22 which extends between the tank 6 and the flange 21 and along which a pre-filter 23, a pre-feed pump 24, a filter 25 and a second pre-feed pump 26 are arranged in succession.
Most of the practical applications envisage the use of only one of the two pre- feed pumps 24 and 26.
The feed circuit 5 comprises two branches 27 and 28 which extend from the branch 22 and are designed, respectively, to feed the fuel to the pumping members 4 and to feed the chamber 18 and cool the bearing 20.
The feed circuit 5 comprises a metering solenoid valve 29 arranged along the branch 27 and an overflow valve 30 arranged along the branch 28.
The branch 27 is connected to a branch 31 for connection to the feed valves 11 of each pumping member 4. The feed circuit 5 comprises a further outlet branch 32 from the overflow valve, which feeds the fuel to the bearing 20, in particular to a ring 33 arranged around the bearing 20.
The feed circuit 5 is completed by a branch 35 which is arranged in parallel with the overflow valve 30 and along which a choke 36 is arranged.
The delivery circuit 7 comprises a collector branch 37 connected to the delivery valves 12 and a branch 38 connected to the common rail not shown in the accompanying figures.
The discharge circuit 8 comprises a branch 39 which is connected to the tank 6 and designed to collect the excess fuel of the entire system 1, a branch 40 which connects the chamber 18 to the branch 39, and a branch 34 which connects the ring 33 to the branch 22 upstream of the pre-feed pump 26.
In accordance with a variant (not shown), the branch 34 is connected to the branch 40.
Figure 2 shows, partly, the high-pressure pump 2 designed to compress the fuel to pressures in the region of 2000 bar and having a chamber 18 defined inside the pump body 3. The chamber 18 is designed to house the actuating mechanism 14 (of which only the shaft 13, rotatable about an axis A, is shown in broken lines in Figure 2).
In particular, the pump body 3 has an annular wall 42 with, formed therein, the three cylinders 9 (only two of which are shown in Figure 2) and three service openings 43 (only two of which are shown in Figure 2) closed by respective plates 44, only one of which is shown in Figure 2.
The pump body 3 comprises a high-thickness wall 45 which extends perpendicularly with respect to the axis A, is adjacent to the wall 42 and has the hole 19 situated along the axis A for housing the shaft 13. The chamber 18 is closed by the flange 21 (not shown in Figure 2) mounted on the pump body 3 along the opposite side of the wall 45.
In this case, the hole 19 is delimited by an inner surface 46 extending around the axis A.
The friction bearing 20 has substantially a cylindrical wall with an outer surface 47 and a ground inner surface 48 rotatably engaged with the shaft 13.
The bearing 20 is fixed with an interference fit inside the hole 19.
The branches 32 and 42 are defined by respective holes formed in the wall 45, while the ring 33 which extends around the bearing 20 is defined by a groove formed in the wall 45 along the inner surface 46 of the hole 19.
Finally it is clear that the method and the system for feeding fuel to an internal combustion engine described here may be subject to modifications and variations without departing from the scope of the accompanying claims.

Claims

Claims
1. Method for feeding fuel to an internal combustion engine, the method comprising the steps of feeding the fuel to a least one pumping member (4) of a high-pressure pump (2) via a first branch (27) of a feed circuit (5), feeding part of the fuel to a chamber (18) of the high-pressure pump (2) containing a mechanism
(14) for actuating the pumping member (4) via a second branch (28) of the feed circuit (5), the method being characterized by feeding part of the fuel to a bearing (20) supporting the actuating mechanism (14) via a third branch (32) of the feed circuit (5) so as to cool the bearing (20).
2. Method according to Claim 1, characterized in that the high-pressure pump (2) has a pump body (3) in which a hole (19) is formed and the bearing (20) is engaged with an interference fit inside the hole (19), the method comprising the step of feeding part of the fuel in contact with the bearing (20) along the outer surface (46) of the bearing (20).
3. System for feeding fuel to an internal combustion engine, the system (1) comprising a high-pressure fuel pump (2) and a circuit (5) for feeding fuel to the high-pressure pump (2), the high-pressure pump (2) comprising at least one pumping member (4), a mechanism (14) for actuating the pumping member (4), arranged inside a chamber (18), and a bearing (20) for supporting, at least partly, the actuating mechanism (14), the feed circuit (5) comprising a first branch (27) for feeding fuel to the pumping member (4), and a second branch (28) for feeding the fuel to the chamber (18), the system being characterized in that the feed circuit (5) comprises at least one third branch (32) for feeding the fuel to the bearing (20) so as to cool the bearing (20).
4. System according to Claim 3, characterized in that the high-pressure pump (2) has a pump body (3) in which a hole (19) is formed and the bearing (20) is engaged with an interference fit inside the hole (19), the feed circuit (5) comprising a fourth branch (33) which is connected to the third branch (32) and extends around the bearing (20).
5. System according to Claim 4, characterized in that the hole (19) has an inner surface (46) and the bearing (20) has an outer surface (47) in contact with the inner surface (46), the fourth branch (33) being defined by a groove formed in the pump body (3) along the inner surface (46) and by a part of the outer surface (47) of the bearing (20).
6. System according to Claim 4 or 5, characterized in that the fourth branch (33) forms a closed loop around the bearing (20).
7. System according to one of Claims 4 to 6, characterized in that the said fourth branch (33) is connected to the feed circuit (5).
8. System according to one of Claims 4 to 6, characterized in that it comprises a tank (6) and a discharge circuit for discharging the excess fuel into the tank (6), the said fourth branch (33) being connected to the discharge circuit (8).
9. System according to one of Claims 3 to 7, characterized in that the bearing (20) is a friction bearing.
10. System according to any one of Claims 3 to 8, characterized in that the third branch (32) is formed entirely inside the high-pressure pump (2).
PCT/EP2009/053495 2008-05-23 2009-03-25 Method and system for feeding fuel to an internal combustion engine WO2009141188A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2008A000966 2008-05-23
ITMI20080966 ITMI20080966A1 (en) 2008-05-23 2008-05-23 METHOD AND PLANT FOR FUEL SUPPLY TO AN INTERNAL COMBUSTION ENGINE

Publications (1)

Publication Number Publication Date
WO2009141188A1 true WO2009141188A1 (en) 2009-11-26

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Application Number Title Priority Date Filing Date
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IT (1) ITMI20080966A1 (en)
WO (1) WO2009141188A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20091569A1 (en) * 2009-09-14 2011-03-15 Bosch Gmbh Robert HIGH PRESSURE PUMP IMPROVED FOR FUEL SUPPLY TO AN INTERNAL COMBUSTION ENGINE AND IMPROVED TREE SEAL RING FOR THE SAME
ITMI20092271A1 (en) * 2009-12-22 2011-06-23 Bosch Gmbh Robert FUEL SUPPLY SYSTEM FROM A TANK TO AN INTERNAL COMBUSTION ENGINE
WO2015169745A1 (en) * 2014-05-09 2015-11-12 Robert Bosch Gmbh Pumping unit for feeding fuel, preferably diesel fuel, from a storage tank to an internal combustion engine
DE102013100845B4 (en) * 2012-01-31 2020-09-03 Denso Corporation Fuel feed pump

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19746563A1 (en) * 1997-10-22 1999-04-29 Bosch Gmbh Robert Fuel injection system for IC engine
EP1389683A2 (en) * 2002-08-16 2004-02-18 Robert Bosch Gmbh Fuel injection system for internal combustion engine
EP1911964A1 (en) * 2006-10-12 2008-04-16 Robert Bosch Gmbh High-pressure fuel pump and fuel injection system for a combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19746563A1 (en) * 1997-10-22 1999-04-29 Bosch Gmbh Robert Fuel injection system for IC engine
EP1389683A2 (en) * 2002-08-16 2004-02-18 Robert Bosch Gmbh Fuel injection system for internal combustion engine
EP1911964A1 (en) * 2006-10-12 2008-04-16 Robert Bosch Gmbh High-pressure fuel pump and fuel injection system for a combustion engine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20091569A1 (en) * 2009-09-14 2011-03-15 Bosch Gmbh Robert HIGH PRESSURE PUMP IMPROVED FOR FUEL SUPPLY TO AN INTERNAL COMBUSTION ENGINE AND IMPROVED TREE SEAL RING FOR THE SAME
ITMI20092271A1 (en) * 2009-12-22 2011-06-23 Bosch Gmbh Robert FUEL SUPPLY SYSTEM FROM A TANK TO AN INTERNAL COMBUSTION ENGINE
WO2011076526A1 (en) * 2009-12-22 2011-06-30 Robert Bosch Gmbh System for feeding fuel from a tank to an internal combustion engine
CN102713295A (en) * 2009-12-22 2012-10-03 罗伯特·博世有限公司 System for supplying fuel from a tank to an internal combustion engine
US9133804B2 (en) 2009-12-22 2015-09-15 Robert Bosch Gmbh System for feeding fuel from a tank to an internal combustion engine
DE102013100845B4 (en) * 2012-01-31 2020-09-03 Denso Corporation Fuel feed pump
WO2015169745A1 (en) * 2014-05-09 2015-11-12 Robert Bosch Gmbh Pumping unit for feeding fuel, preferably diesel fuel, from a storage tank to an internal combustion engine

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