EP2660456B1 - Pompe à carburant - Google Patents

Pompe à carburant Download PDF

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Publication number
EP2660456B1
EP2660456B1 EP12166297.7A EP12166297A EP2660456B1 EP 2660456 B1 EP2660456 B1 EP 2660456B1 EP 12166297 A EP12166297 A EP 12166297A EP 2660456 B1 EP2660456 B1 EP 2660456B1
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EP
European Patent Office
Prior art keywords
fuel
pump
advance
rotor
vent line
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.)
Active
Application number
EP12166297.7A
Other languages
German (de)
English (en)
Other versions
EP2660456A1 (fr
Inventor
Geoffrey Bootle
Rodney Dyason
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.)
Delphi International Operations Luxembourg SARL
Original Assignee
Delphi International Operations Luxembourg SARL
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 Delphi International Operations Luxembourg SARL filed Critical Delphi International Operations Luxembourg SARL
Priority to EP12166297.7A priority Critical patent/EP2660456B1/fr
Priority to CN201380022963.5A priority patent/CN104619980B/zh
Priority to PCT/EP2013/058012 priority patent/WO2013164195A1/fr
Publication of EP2660456A1 publication Critical patent/EP2660456A1/fr
Application granted granted Critical
Publication of EP2660456B1 publication Critical patent/EP2660456B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
    • F02M41/14—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons
    • F02M41/1405—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis
    • F02M41/1411—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis characterised by means for varying fuel delivery or injection timing
    • F02M41/1416—Devices specially adapted for angular adjustment of annular cam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
    • F02D1/16—Adjustment of injection timing
    • F02D1/18—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse
    • F02D1/183—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse hydraulic
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/007—Venting means

Definitions

  • the present invention relates to a rotary fuel pump; an advance arrangement for a rotary fuel pump; and a rotor for a rotary fuel pump.
  • Patent GB1109020 discloses a known fuel injection pump.
  • a conventional rotary fuel pump 1 includes a cam ring 3 which is angularly adjustable with respect to a pump housing 5.
  • a rotor 7 comprising a distributor member 9 is provided for supplying metered volumes of high pressure fuel to fuel injectors (not shown).
  • the cam ring 3 includes a plurality of cam lobes 11 and encircles part of the distributor member 9, including pumping plungers 13 which are slidable within respective bores 15 of the distributor member 9.
  • Each of the pumping plungers 13 has an associated shoe 17 and roller 19 arrangement, the rollers 19 of which are engagable with the cam surface of the cam ring 3.
  • the cam ring 3 is housed in a cam box 21 defined within the pump housing 5.
  • transfer pressure a force due to fuel pressure within the bores 15 serves to urge the plungers 13 in a radially outward direction.
  • the output pressure of the transfer pump 16 (referred to as "transfer pressure") is controlled so as to be related to the speed of operation of the engine with which the pump 1 is being used.
  • Rotation of the distributor member 9 relative to the cam ring 3 causes the rollers 19 to move relative to the cam ring 3, engagement between the rollers 19 and the cam lobes 11 thereby causing the plungers 13 to be forced in a radially inward direction to pressurise fuel within the respective bore 15 and causing fuel to be delivered by the pump 1 at relatively high pressure.
  • the timing at which fuel is delivered by the pump 1 can be adjusted.
  • the advance arrangement 23 includes a servo piston arrangement which is arranged to influence the degree of timing advance depending on the operating speed of the engine (referred to as “speed advance”), a light load piston arrangement, including a load sensing piston, which is arranged to influence the degree of timing advance depending on the load under which the engine is operating (referred to as “light load advance”) and a temperature control valve which is arranged to influence the degree of timing advance depending on the operating temperature of the engine (referred to as "cold advance").
  • the cam ring 3 is provided with a cam ball screw 25 which extends into an opening provided in an advance piston in order to permit adjustment of the angular position of the cam ring.
  • the advance piston is slidable within a further bore provided in an advance box housing 27. The ends of the bore are closed by first and second end plates respectively which are secured to the advance box housing 27 by means of bolts 29. Appropriate O-rings may be used to seal the end plates to the advance box housing 27.
  • the advance piston is responsive to fuel pressure changes within an advance piston control chamber (the main advance control chamber). If the pressure in the main advance control chamber increases, the advance piston is caused to move in a first direction so as to advance the timing of fuel delivery. If the pressure in the main advance control chamber is reduced, the advance piston is caused to move in an opposite direction to retard the timing of fuel delivery.
  • the present invention sets out to help ameliorate or overcome at least some of the problems associated with prior art systems.
  • aspects of the present invention relate to a rotary fuel pump; an advance arrangement for a rotary fuel pump; and a rotor for a rotary fuel pump.
  • the present invention relates to a rotary fuel pump comprising:
  • the first vent line allows air to vent from the fuel supplied to the advance arrangement, thereby reducing the introduction of air to the advance arrangement.
  • the operation of the advance arrangement, including an advance piston, can be controlled even when air is present in the speed dependent fuel pressure line.
  • the first vent line can be provided between a pump for supplying the speed dependent fuel pressure and the advance arrangement.
  • the first vent line is in fluid communication with a collection chamber for collecting air vented from the speed dependent fuel pressure line.
  • the collection chamber can be an annular chamber extending around the rotor.
  • the annular chamber can be maintained in fluid communication with the first vent line.
  • An aperture could be formed in a housing supporting the rotor to form the annular chamber.
  • the annular chamber can comprise an annular groove formed in the rotor.
  • a second vent line is provided for venting air from the collection chamber.
  • the second vent line can be in fluid communication with a drain or a reservoir.
  • the second vent line can be in fluid communication with the cambox.
  • the second vent line could be formed in a pump housing.
  • the second vent line can comprise an aperture formed in the rotor.
  • the aperture comprises a helical groove formed in the rotor.
  • the helical groove can be turned in the same direction as the rotational direction of the rotor; or in the opposite direction to the rotational direction of the rotor.
  • the second vent line can have a relatively small cross-sectional area to define a viscous leak path for inhibiting the flow of fuel from the collection chamber to the cam box.
  • the first vent line can have a larger cross-sectional area than the second vent line.
  • the first vent line can comprise an inlet and an outlet.
  • the inlet can be positioned at an operative high point of the speed dependent fuel pressure line. This arrangement can promote the venting of air from the speed dependent pressure line.
  • the rotary fuel pump can further comprise one or more plungers actuatable by the cam arrangement.
  • the cam arrangement is arranged to cooperate, in use, with an advance piston provided in an advance arrangement.
  • the present invention also relates to a rotary fuel pump as described herein in combination with an advance arrangement.
  • the advance arrangement can comprise an advance piston which is slidable within a first bore and which cooperates, in use, with the cam arrangement of the fuel pump to adjust the timing of fuel delivery by the pump.
  • the present invention relates to an advance arrangement for use in controlling timing of fuel delivery by a fuel pump for use in an engine comprising;
  • the first vent line can be in fluid communication with a collection chamber for collecting air vented from the speed dependent fuel pressure line.
  • a second vent line can be provided for venting air from the collection chamber.
  • the present invention relates to a rotor for a rotary fuel pump, the rotor comprising a head portion and a body portion, wherein at least one aperture is formed in the head portion for providing a fluid communication pathway.
  • the at least one aperture can provide a communication pathway from a first side of the head portion to a second side of the head portion.
  • the at least one aperture can be a helical recess formed in an outer surface of the head portion.
  • An annular groove can be formed in the body portion to form a collection chamber.
  • a rotary fuel pump 101 in accordance with an embodiment of the present invention will now be described with reference to Figure 2 .
  • the rotary fuel pump 101 is a modified version of for storing air vented from the transfer pressure supply line 127 the prior art fuel pump 1 illustrated in Figure 1 .
  • the rotary fuel pump 101 comprises a cam ring 103 which is angularly adjustable with respect to a pump housing 105.
  • a hydraulic head rotor 107 comprising a distributor member 109 is provided for supplying metered volumes of high pressure fuel to fuel injectors (not shown).
  • the hydraulic head rotor 107 comprises a head portion 107a and a body portion 107b which is supported in a hydraulic head sleeve 111 located in the pump housing 105.
  • the cam ring 103 includes a plurality of cam lobes 113 and encircles part of the distributor member 109, including pumping plungers 115 which are slidable within respective bores 117 of the distributor member 109.
  • Each of the pumping plungers 115 has an associated shoe 119 and roller 121 arrangement, the rollers 121 of which are engageable with the cam surface of the cam ring 103.
  • the cam ring 103 is housed in a cam box 123 defined within the pump housing 105.
  • An advance arrangement 125 is provided for controlling speed advance, light load advance and cold advance.
  • the advance arrangement 125 comprises an advance piston (not shown) provided in an advance box housing 127.
  • the advance piston is coupled to the cam ring 103 by a cam ball screw 128.
  • the advance piston is slidable within a bore (extending along an axis X extending perpendicular to the plane of the page in Figure 2 ) to alter the angular position of the cam ring 103.
  • the advance piston is slidable within the bore in either an advance or a retard direction to advance or retard, respectively, the timing of the fuel pump delivery.
  • a transfer pump 130 is provided for supplying fuel to the distributor member 109 and the advance arrangement 125.
  • the output pressure of the transfer pump (referred to as "transfer pressure") is controlled so as to be related to the speed of operation of the engine with which the pump 1 is being used. Thus, the output pressure of the transfer pump is speed dependent.
  • An inlet metering valve 127 supplies a metered volume of fuel to the distributor member 109.
  • the transfer pump 130 is in fluid communication with an annular groove for supplying fuel to the inlet metering valve 127 via a top pressure supply line 132 and an electric shut-off solenoid chamber.
  • a transfer pressure supply line 129 is provided for supplying fuel from the transfer pump 130 to the advance arrangement 125. The transfer pressure supply line 129 is not in communication with the inlet metering valve 127.
  • the transfer pump supplies fuel to a main control chamber for controlling the position of the advance piston in response to variations in the speed dependent fuel pressure to permit adjustment of the timing in response to engine speed.
  • a suitable mechanism for controlling operation of the advance piston is known from US patent number US 7,350,508 (Delphi Technologies, Inc.). It will be appreciated that the present invention is not limited to this particular control mechanism and can be used with other advance arrangements.
  • a venting bore 131 having an inlet 133 and an outlet 135 is provided to vent air from the transfer pressure supply line 127.
  • the venting bore 131 extends through the hydraulic head sleeve 111 and forms a first communication pathway extending from the transfer pressure supply line 129 to a collection chamber 137 for storing air vented from the transfer pressure supply line 129.
  • the inlet 133 is provided at a relatively high point of the transfer pressure supply line 129 to promote the flow of air from the transfer pressure supply line 129; and the outlet 135 is open to the collection chamber 137.
  • an annular groove 139 is formed in the body portion 107b of the rotor 107 to form the collection chamber 137. In use, rather than a large volume of air being swept into the advance arrangement 125, the air will rise upwards into the collection chamber 137 via the venting bore 131.
  • a helical groove 141 is formed in an outer surface of the head portion 107a of the rotor 107 to form a second communication pathway extending from the collection chamber 137 to the cam box 123.
  • the helical groove 141 has a shallow, narrow profile and leads to an 'anti-seizure' groove provided at the front of the rotor 107 just behind the head portion 107a of the rotor 107 within the cam box 123.
  • the annular groove 139 is relatively large in comparison to the helical groove 141. The air collected in the annular groove 139 can be ejected along the helical groove 141 under the influence of the large pressure difference between the transfer pressure in the collection chamber 137 and the pressure in the cam box 123 in front of the rotor 107.
  • the helical groove 141 is dimensioned so as to define a viscous leak path suitable for minimizing the flow of fuel from the transfer pressure supply line 129 to the cam box 123.
  • the loss of transfer pressure to the cam box 123 when there is no air in the collection chamber 137 is thereby reduced.
  • Forming the communication pathway from the collection chamber 137 to the cam box 123 in the form of a helical groove 141 serves several purposes, including:
  • At least one additional communication pathway (not shown) is provided for venting air from the cam box 123.
  • a back-leakage connection from the cam box 123 to the fuel tank (not shown) is used to vent the air from the cam box 123 and return it to the fuel tank.
  • the pump 101 operates in substantially the same way as the prior art pump 1 illustrated in Figure 1 .
  • the transfer pump supplies a volume of air to the advance arrangement 125
  • at least some of the air can be vented from the transfer pressure supply line 127 via the venting bore 131.
  • the air is collected in the collection chamber 137 and gradually vented to the cam box 123 via the helical groove 141. Thereafter, the air can be vented to atmosphere from the cam box 123.
  • the risk of a relatively large volume of air being introduced into the advance arrangement 125 is reduced, thereby protecting the advance piston from damage.

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

Claims (7)

  1. Pompe à carburant rotative (101) comprenant :
    un rotor (107) ayant au moins un élément de pompage (115) pour alimenter un carburant à haute pression ;
    une boîte à cames (123) contenant un agencement à cames (103) pour actionner ledit au moins un élément de pompage (115) ;
    un conduit de carburant à pression dépendante de la vitesse (129) pour alimenter une pression de carburant dépendante de la vitesse à un agencement d'avance (125) pour ajuster la temporisation de la distribution de carburant par la pompe (101);
    un premier conduit de purge (131) pour purger l'air hors du conduit de carburant à pression dépendante de la vitesse (129), le premier conduit de purge (131) étant en communication fluidique avec une chambre de collecte (137) destinée à collecter l'air purgé hors du conduit de carburant à pression dépendante de la vitesse (129) ; et
    un second conduit de purge (141) pour purger l'air hors de la chambre de collecte (137) ;
    dans laquelle le second conduit de purge (141) comprend une ouverture comprenant une rainure hélicoïdale (141) formée dans ledit rotor (107).
  2. Pompe à carburant rotative (101) selon la revendication 1, dans laquelle la chambre de collecte (137) est une chambre annulaire s'étendant autour dudit rotor (107).
  3. Pompe à carburant rotative (101) selon la revendication 2, dans laquelle ladite chambre annulaire (137) comprend une rainure annulaire (139) formée dans ledit rotor (107).
  4. Pompe à carburant rotative (101) selon l'une quelconque des revendications précédentes, dans laquelle le premier conduit de purge (131) est prévu entre une pompe pour alimenter le carburant à pression dépendante de la vitesse et l'agencement d'avance.
  5. Pompe à carburant rotative (101) selon l'une quelconque des revendications précédentes, dans laquelle le second conduit de purge (141) est en communication fluidique avec la boîte à cames (123).
  6. Pompe à carburant rotative (101) selon l'une quelconque des revendications précédentes, dans laquelle ladite rainure hélicoïdale (141) tourne dans la même direction que la direction de rotation du rotor (107).
  7. Pompe à carburant rotative (101) selon l'une quelconque des revendications précédentes, dans laquelle le premier conduit de purge (131) comprend une entrée (133) et une sortie (135), l'entrée (133) étant positionnée à un point fonctionnel haut du conduit de carburant à pression dépendante de la vitesse (129).
EP12166297.7A 2012-05-01 2012-05-01 Pompe à carburant Active EP2660456B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP12166297.7A EP2660456B1 (fr) 2012-05-01 2012-05-01 Pompe à carburant
CN201380022963.5A CN104619980B (zh) 2012-05-01 2013-04-17 一种旋转燃料泵及用于其的转子和泵壳体
PCT/EP2013/058012 WO2013164195A1 (fr) 2012-05-01 2013-04-17 Pompe à carburant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12166297.7A EP2660456B1 (fr) 2012-05-01 2012-05-01 Pompe à carburant

Publications (2)

Publication Number Publication Date
EP2660456A1 EP2660456A1 (fr) 2013-11-06
EP2660456B1 true EP2660456B1 (fr) 2017-12-06

Family

ID=48142773

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12166297.7A Active EP2660456B1 (fr) 2012-05-01 2012-05-01 Pompe à carburant

Country Status (3)

Country Link
EP (1) EP2660456B1 (fr)
CN (1) CN104619980B (fr)
WO (1) WO2013164195A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1454055A1 (fr) * 2001-12-01 2004-09-08 Robert Bosch Gmbh Pompe a piston radiaux a graissage force

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1109020A (en) * 1965-11-01 1968-04-10 Roosa Vernon D Fuel injection pump assemblies for internal combustion engines
US3486492A (en) * 1967-11-07 1969-12-30 Allis Chalmers Mfg Co Timing advance mechanism
US4381182A (en) * 1979-07-27 1983-04-26 Lucas Industries Limited Fuel injection pump
US4453522A (en) * 1980-04-28 1984-06-12 Stanadyne, Inc. Apparatus for adjusting the timing of a fuel injection pump
US4915592A (en) * 1987-08-10 1990-04-10 Nippondenso Co., Ltd. Inner-cam type distribution fuel injection pump
US5688110A (en) * 1995-06-02 1997-11-18 Stanadyne Automotive Corp. Fuel pump arrangement having cam driven low and high pressure reciprocating plunger pump units
GB9703121D0 (en) * 1997-02-14 1997-04-02 Lucas Ind Plc Advance arrangement
US7350508B1 (en) 2006-10-12 2008-04-01 Delphi Technologies, Inc. Advance arrangements

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1454055A1 (fr) * 2001-12-01 2004-09-08 Robert Bosch Gmbh Pompe a piston radiaux a graissage force

Also Published As

Publication number Publication date
EP2660456A1 (fr) 2013-11-06
CN104619980B (zh) 2017-07-21
WO2013164195A1 (fr) 2013-11-07
CN104619980A (zh) 2015-05-13

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