EP0304741A1 - In-line pump for fuel injection systems with controlled injectors for i.c. engines - Google Patents

In-line pump for fuel injection systems with controlled injectors for i.c. engines Download PDF

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Publication number
EP0304741A1
EP0304741A1 EP88113139A EP88113139A EP0304741A1 EP 0304741 A1 EP0304741 A1 EP 0304741A1 EP 88113139 A EP88113139 A EP 88113139A EP 88113139 A EP88113139 A EP 88113139A EP 0304741 A1 EP0304741 A1 EP 0304741A1
Authority
EP
European Patent Office
Prior art keywords
pump
engines
fuel injection
injection systems
controlled injectors
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP88113139A
Other languages
German (de)
French (fr)
Inventor
Renato Filippi
Sergio Turchi
Mario Sfarzetta
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weber SRL
Original Assignee
Weber SRL
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 Weber SRL filed Critical Weber SRL
Publication of EP0304741A1 publication Critical patent/EP0304741A1/en
Withdrawn legal-status Critical Current

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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
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/005—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons
    • F04B11/0058—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons with piston speed control
    • F04B11/0066—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons with piston speed control with special shape of the actuating element
    • 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
    • F02M59/08—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 two or more pumping elements with conjoint outlet or several pumping elements feeding one engine cylinder
    • 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
    • F02M59/10—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 the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • 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
    • F02M59/38—Pumps characterised by adaptations to special uses or conditions

Definitions

  • the present invention relates in general to in­jection pumps for fuel injection systems for i.c. engines for motor vehicles, particularly diesel engines.
  • the invention relates to an in-line injection pump for injection systems with con­trolled injectors, of the type comprising a body con­taining one or more in-line cylinder-and-piston pumping units driven by a shaft with eccentrics connected through respective intake and delivery valves to inlet and outlet means for the fuel.
  • the object of the present invention is to provide a pump of the type specified above, having a simpler and cheaper construction than conventional pumps of this type, with a modular structure adapted to pump high-­pressure fuel at a constant rate of flow without the need of an external accumulator.
  • this object is achieved by virtue of the fact that the pump includes two pumping units and the cams of the drive shaft have a double-­lobed profile with constant accelerations, and in particular null in the delivery phase.
  • an in-line in­jection pump for fuel injection systems for diesel engines with electrically controlled injectors is generally indicated 1.
  • the pump 1 comprises essentially a base 2 which is normally of aluminium and is provided at one end with a substantially triangular attachment flange 3, and a head 4, normally of steel, which is separate from the base 2 and is fixed to its top by means of screws 5.
  • each in-line pumping unit 6 includes, in generally known manner, a tappet 7 driven by a cam-shaft 8 for driving a piston 9.
  • Each piston 9 is reciprocable within a respective cylinder 10 formed in an insert 11 carried by the head 4 and extending into an upper zone of the base 2.
  • Each tappet 7 cooperates operatively with a respective cam 12 of the shaft 8 which, as illustrated in greater detail in Figure 2, has a double-lobed profile.
  • Each cylinder 10 is associated with an intake valve 13 and a delivery valve 14 of generally known type.
  • the two intake valves 13 are connected to a com­mon passage 15 formed in the head 4 and communicating with an inlet connector 16 fitted to one side thereof, whilst the two delivery valves 14 are connected to a common passage 17 parallel to the passage 15 and com­ municating with a delivery connector 18 carried by the opposite side of the head 4.
  • the high-pressure side of the pump is located entirely with­in the head 4, with an obvious rationalisation and simplification of the construction of the pump.
  • Figure 4 illustrates several functional graphs of the pump according to the invention, resulting from the particular profile of the cams 12 which are designed so as to achieve constant accelerations with trapezoidal-­asymmetric-type changes in the velocity of the pistons 9. Suitable staggering of the cams 12 gives a low-pres­sure ripple at the outlet, with minimised dead volumes, since the overlapping of delivery of the pumping units allows accomplishment of constant flow rate over the 360° of rotation of the pump.
  • the graphs of Figure 4 relate in particular to the pump according to the invention, which is dimen­sioned as follows: - total swept volume: 0.4 - 0.6 cm3 /revolution - maximum velocity: 2800 revolutions per minute - base radius of the cams 12: 14.5mm - roll radius of the tappet 7: 8.5mm - maximum rise: 6 mm.
  • the three graphs of Figure 4 show, in dependence on the angular position of the cams 12, the rise, the velocity and the acceleration of the pistons 9, respectively.

Landscapes

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

Abstract

An in-line pump for fuel injection systems with controlled injectors for i.c. engines includes two piston-and-cylinder pumping units (9, 10) driven by a shaft with eccentrics (12) having double-lobed profile with null acceleration in the delivery phase and con­stant speed.

Description

  • The present invention relates in general to in­jection pumps for fuel injection systems for i.c. engines for motor vehicles, particularly diesel engines.
  • More particularly, the invention relates to an in-line injection pump for injection systems with con­trolled injectors, of the type comprising a body con­taining one or more in-line cylinder-and-piston pumping units driven by a shaft with eccentrics connected through respective intake and delivery valves to inlet and outlet means for the fuel.
  • The object of the present invention is to provide a pump of the type specified above, having a simpler and cheaper construction than conventional pumps of this type, with a modular structure adapted to pump high-­pressure fuel at a constant rate of flow without the need of an external accumulator.
  • According to the invention this object is achieved by virtue of the fact that the pump includes two pumping units and the cams of the drive shaft have a double-­lobed profile with constant accelerations, and in particular null in the delivery phase.
  • The invention will now be described in detail with reference to the appended drawings, provided purely by way of non-limiting example, in which:
    • Figure 1 is a schematic longitudinal sectional view of an in-line injection pump according to the in­vention,
    • Figure 2 is a cross-section taken on the line II-­ II of Figure 1,
    • Figure 3 is a horizontal section taken on the line III-III of Figure 1, and
    • Figure 4 shows several functional graphs of the pump according to the invention.
  • With reference to Figures 1 to 3, an in-line in­jection pump for fuel injection systems for diesel engines with electrically controlled injectors (not illustrated) is generally indicated 1.
  • The pump 1 comprises essentially a base 2 which is normally of aluminium and is provided at one end with a substantially triangular attachment flange 3, and a head 4, normally of steel, which is separate from the base 2 and is fixed to its top by means of screws 5.
  • Within the base 2 are two in-line pumping units 6, each of which includes, in generally known manner, a tappet 7 driven by a cam-shaft 8 for driving a piston 9. Each piston 9 is reciprocable within a respective cylinder 10 formed in an insert 11 carried by the head 4 and extending into an upper zone of the base 2. Each tappet 7 cooperates operatively with a respective cam 12 of the shaft 8 which, as illustrated in greater detail in Figure 2, has a double-lobed profile.
  • Each cylinder 10 is associated with an intake valve 13 and a delivery valve 14 of generally known type. The two intake valves 13 are connected to a com­mon passage 15 formed in the head 4 and communicating with an inlet connector 16 fitted to one side thereof, whilst the two delivery valves 14 are connected to a common passage 17 parallel to the passage 15 and com­ municating with a delivery connector 18 carried by the opposite side of the head 4. Thus, in practice, the high-pressure side of the pump is located entirely with­in the head 4, with an obvious rationalisation and simplification of the construction of the pump.
  • Figure 4 illustrates several functional graphs of the pump according to the invention, resulting from the particular profile of the cams 12 which are designed so as to achieve constant accelerations with trapezoidal-­asymmetric-type changes in the velocity of the pistons 9. Suitable staggering of the cams 12 gives a low-pres­sure ripple at the outlet, with minimised dead volumes, since the overlapping of delivery of the pumping units allows accomplishment of constant flow rate over the 360° of rotation of the pump.
  • The graphs of Figure 4 relate in particular to the pump according to the invention, which is dimen­sioned as follows:
    - total swept volume: 0.4 - 0.6 cm³ /revolution
    - maximum velocity: 2800 revolutions per minute
    - base radius of the cams 12: 14.5mm
    - roll radius of the tappet 7: 8.5mm
    - maximum rise: 6 mm.
  • The three graphs of Figure 4 show, in dependence on the angular position of the cams 12, the rise, the velocity and the acceleration of the pistons 9, respectively.
  • Although the invention has been described with reference to a two-cylinder in-line pump, it is clear that it could also be applied with equal advantage to multi-cylinder pumps.

Claims (1)

  1. An in-line injection pump for fuel injection sys­tems with controlled injectors for i.c. engines, includ­ing a body containing one or more in-line cylinder-and-­piston pumping units driven by a shaft with eccentrics and connected through respective intake and delivery valves to inlet and outlet means for the fuel, charac­terised in that it includes two pumping units (9, 10) and in that the cams (12) of the drive shaft (8) have a double-lobed profile with null accelerations in the delivery phase and constant speed, so as to ensure constant fuel flow rate along the 360° of rotation of the pump.
EP88113139A 1987-08-25 1988-08-12 In-line pump for fuel injection systems with controlled injectors for i.c. engines Withdrawn EP0304741A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT67732/87A IT1217254B (en) 1987-08-25 1987-08-25 IN-LINE PUMP FOR FUEL INJECTION SYSTEMS WITH COMMANDED INJECTORS FOR DIESEL CYCLE ENGINES
IT6773287 1987-08-25

Publications (1)

Publication Number Publication Date
EP0304741A1 true EP0304741A1 (en) 1989-03-01

Family

ID=11304859

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88113139A Withdrawn EP0304741A1 (en) 1987-08-25 1988-08-12 In-line pump for fuel injection systems with controlled injectors for i.c. engines

Country Status (4)

Country Link
EP (1) EP0304741A1 (en)
JP (1) JPH01267356A (en)
BR (1) BR8804303A (en)
IT (1) IT1217254B (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0453227A1 (en) * 1990-04-20 1991-10-23 Zexel Corporation Fuel injection pump
EP0629777A1 (en) * 1993-06-18 1994-12-21 Yamaha Hatsudoki Kabushiki Kaisha Fuel injection system
WO1999037910A1 (en) * 1998-01-23 1999-07-29 Robert Bosch Gmbh Pump system for supplying fuel at high pressure
EP0856661A3 (en) * 1997-01-30 2000-01-26 Lucas Industries Limited Fuel pump
EP1072787A2 (en) † 1999-07-28 2001-01-31 Toyota Jidosha Kabushiki Kaisha High-pressure fuel pump and cam for high-pressure fuel pump
EP1270929A1 (en) * 2000-03-14 2003-01-02 Bosch Automotive Systems Corporation Fuel pump and fuel feeding device using the fuel pump
EP1655480A1 (en) * 2004-11-04 2006-05-10 Robert Bosch Gmbh Method of using a fuel system of an internal combustion engine and fuel system
JP2017529487A (en) * 2014-10-09 2017-10-05 ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング Pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine
DE102017102589A1 (en) 2017-02-09 2018-08-09 Volkswagen Ag internal combustion engine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB365061A (en) * 1930-10-11 1932-01-11 Superior Engine Company Inc Improvements in or relating to fuel pumps
US2440194A (en) * 1946-01-29 1948-04-20 Texas Co Fuel pump
US2845875A (en) * 1956-03-29 1958-08-05 Thomas H Corbett Pumps
DE1297479B (en) * 1968-02-28 1969-06-12 Brueckner Alfred Cylinder head of a high pressure piston pump for fluids

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB365061A (en) * 1930-10-11 1932-01-11 Superior Engine Company Inc Improvements in or relating to fuel pumps
US2440194A (en) * 1946-01-29 1948-04-20 Texas Co Fuel pump
US2845875A (en) * 1956-03-29 1958-08-05 Thomas H Corbett Pumps
DE1297479B (en) * 1968-02-28 1969-06-12 Brueckner Alfred Cylinder head of a high pressure piston pump for fluids

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
V.A. VANSCHEIDT: "Design and strength calculations of marine diesel engines", 1969, pages 365-370, Soudostroenie, Leningrad, SU *

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0453227A1 (en) * 1990-04-20 1991-10-23 Zexel Corporation Fuel injection pump
US5165851A (en) * 1990-04-20 1992-11-24 Zexel Corporation Fuel injection pump
EP0629777A1 (en) * 1993-06-18 1994-12-21 Yamaha Hatsudoki Kabushiki Kaisha Fuel injection system
US5511956A (en) * 1993-06-18 1996-04-30 Yamaha Hatsudoki Kabushiki Kaisha High pressure fuel pump for internal combustion engine
EP0856661A3 (en) * 1997-01-30 2000-01-26 Lucas Industries Limited Fuel pump
WO1999037910A1 (en) * 1998-01-23 1999-07-29 Robert Bosch Gmbh Pump system for supplying fuel at high pressure
EP1072787A2 (en) † 1999-07-28 2001-01-31 Toyota Jidosha Kabushiki Kaisha High-pressure fuel pump and cam for high-pressure fuel pump
EP1072787B2 (en) † 1999-07-28 2010-02-24 Toyota Jidosha Kabushiki Kaisha High-pressure fuel pump and cam for high-pressure fuel pump
EP1270929A1 (en) * 2000-03-14 2003-01-02 Bosch Automotive Systems Corporation Fuel pump and fuel feeding device using the fuel pump
EP1270929A4 (en) * 2000-03-14 2004-08-18 Bosch Automotive Systems Corp Fuel pump and fuel feeding device using the fuel pump
EP1655480A1 (en) * 2004-11-04 2006-05-10 Robert Bosch Gmbh Method of using a fuel system of an internal combustion engine and fuel system
JP2017529487A (en) * 2014-10-09 2017-10-05 ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング Pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine
US10107244B2 (en) 2014-10-09 2018-10-23 Robert Bosch Gmbh Pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine
DE102017102589A1 (en) 2017-02-09 2018-08-09 Volkswagen Ag internal combustion engine
DE102017102589B4 (en) 2017-02-09 2021-08-19 Volkswagen Ag Internal combustion engine

Also Published As

Publication number Publication date
BR8804303A (en) 1989-03-21
IT1217254B (en) 1990-03-22
JPH01267356A (en) 1989-10-25
IT8767732A0 (en) 1987-08-25

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