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WO1992010668A1 - Pompe d'injection de carburant - Google Patents

Pompe d'injection de carburant Download PDF

Info

Publication number
WO1992010668A1
WO1992010668A1 PCT/GB1991/002024 GB9102024W WO9210668A1 WO 1992010668 A1 WO1992010668 A1 WO 1992010668A1 GB 9102024 W GB9102024 W GB 9102024W WO 9210668 A1 WO9210668 A1 WO 9210668A1
Authority
WO
WIPO (PCT)
Prior art keywords
plunger
tubular part
pump
bore
spring
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.)
Ceased
Application number
PCT/GB1991/002024
Other languages
English (en)
Inventor
Edward Robert Lintott
Colin Thomas Timms
Ronald Frederick Turner
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries Ltd
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 Lucas Industries Ltd filed Critical Lucas Industries Ltd
Publication of WO1992010668A1 publication Critical patent/WO1992010668A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • 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
    • F02M59/48—Assembling; Disassembling; Replacing
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/023—Injectors structurally combined with fuel-injection pumps characterised by the pump drive mechanical
    • 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
    • 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
    • F02M59/366—Valves being actuated electrically
    • 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

Definitions

  • This invention relates to a fuel injection pump for supplying fuel to an internal combustion engine and of the kind comprising a plunger mounted in a bore defined in a pump body or in a part mounted in the body, a port formed in the wall of the bore and which is covered during the inward movement of the plunger in the bore so as permit fuel to be supplied through a pump outlet to an associated engine, the plunger being movable inwardly by an engine driven cam and the port serving when uncovered by the plunger to allow fuel to flow into the bore during outward movement of the plunger under the action of a spring.
  • Such a pump can form part of a so called unit injector which is mounted in the cylinder head of the engine, the body of the pump carrying a fuel injection nozzle.
  • the control of fuel quantity may be effected by providing the plunger with a helical control edge which during continued inward movement following closure of the port, uncovers the port or a further port, and adjusting the angular setting of the plunger.
  • the control of fuel quantity may be achieved using an electro-magnetically operable spill valve which is mounted on the pump body. .
  • the pump is mounted on the engine structure at a position to be actuated by an engine driven cam through a rocker mechanism which incorporates an adjuster and there will be as many pumps mounted on the engine as there are engine cylinders. It is necessary to ensure that each pump is correctly set in relation to the engine and in order to achieve this the plunger of each pump is set to a datum position in its bore, the rotary parts of the engine set to the appropriate position for that pump and the adjuster of the rocker mechanism adjusted to obtain predetermined inward movement of the plunger from the datum position. When all the pumps have been set each pump will have the same delivery characteristic. It is however essential to be able to set the datum position.
  • the object of the present invention is to provide a pump of the kind specified in a simple and convenient form.
  • a pump of the kind specified comprises an annular member fixed relative to the pump body and surrounding in spaced relationship a portion of the plunger which extends from the bore, a tubular part slidably located within said annular member, the spring acting between said body and an abutment carried by said part at its end remote from the body, means coupling said tubular part to the plunger whereby outward movement of the plunger is effected by said spring, an adjustable member carried by said annular member, and means engagable with said adjustable member to limit the movement of said tubular part under the action of said spring.
  • Figure 1 is 'a part sectional side elevation of one example of a pump in accordance with the invention.
  • FIGS 2, 3 and 4 show modifications to the arrangement shown in Figure 1.
  • the pump comprises a pump body 10 having a portion 11 of stepped cylindrical form to which is secured by means of a cap nut 12, a fuel injection nozzle not shown, there being provided intermediate the nozzle arid the pump body a distance piece 13 in which is formed a passage 14 which is connected to the inlet of the nozzle.
  • the portion 11 of the body together with the distance piece 13 and the fuel injection nozzle are located within a bore 15 formed in the cylinder head of the engine with the outlet of the nozzle opening into a combustion chamber of the engine.
  • the passage 14 communicates with a bore 16 formed in the pump body and in which there is slidably located a pumping plunger 17.
  • the plunger extends from the bore and the inner end of the plunger together with the bore and the distance piece constitute a pumping chamber 18.
  • the diameter of the portion of the bore 16 which defines the pumping chamber 18 is slightly larger than the diameter of the pumping plunger and communicating with this portion of the bore is a spill passage 19 which extends to a spill control valve 20 which is electro-magnetically controlled and which is mounted on a lateral extension 21 of the pump body.
  • the spill valve also communicates with a return passage 22 which by way of a drilling in the cap nut, communicates with a return passage 23 formed in the cylinder head of the engine.
  • the cylinder head of the engine also defines a fuel supply passage 24 and this by way of a further drilling in the cap nut communicates with a supply passage 25 formed in the pump body and which communicates with an annular groove 26 formed in the wall of the bore. For communication with this groove there is formed a transverse drilling 27 in the plunger which is in communication by way of an axial drilling in the plunger with the pumping chamber 18.
  • the plunger is shown in its outermost position and during inward movement which is effected by an engine driven cam as will be explained, fuel wp.ll be displaced from the pumping chamber 18 and will flow along the drillings 28, 27 to the passage 25 until such time as t drilling 27 moves out of register with the groove 26.
  • Providing the spill valve 20 is in the closed position fuel will then be delivered from the pumping chamber 18 to the injection nozzle and such flow of fuel to the engine will occur as long as the plunger is being moved inwardly and the spill valve is closed. If the spill valve 20 is opened the fuel is spilled from the pumping chamber by way of the passages 19, 22 and 23.
  • the spil valve can remain open during the initial movement of th plunger following closure of the drilling 27 and can be closed to initiate delivery of fuel to the engine so th the timing of fuel delivery to the engine can be adjust and then opened to provide a control of fuel quantity.
  • the plunger 17 is moved inwardly by the action of an engine driven cam which actuates the plunger through a rocker not shown incorporating the usual form of adjuster.
  • a ball ended screw forming the adjuster locates within a recess 30 which is formed in an elongated push member 31 the opposite end of which engages a push piece 32 which is interposed between the end of the push member 31 and the adjacent end of the plunger 17.
  • the push piece is mounted in the end of a tubular part 33 which is slidabl mounted in an annular member 34 which in the particular example, is integrally formed with the body.
  • the member 34 surrounds the extending portion of the plunger in spaced relationship and the end portion thereof remote from the body is provided with a peripheral screw thread
  • the tubular part at its end remote from the body 10 is flared outwardly and defines a step against which is located a ring 35 which is interposed between the step and a complementary step formed on a flanged spring abutment 36 between which and the body 10 is located a coiled compression spring 37.
  • the tubular part 33 has a forked extension 38 which extends normal to the axis of the plunger and is located within a groove 39 formed in the plunger whereby when the follower which engages the cam lobe moves onto the trailing face of the cam, the plunger is drawn outwardly of the bore by the action of the spring 37.
  • a multi-cylinder engine will have as many pumps of the kind described as there are engine cylinders and as explained it is necessary to adjust each pump so that it supplies fuel to the engine in as identical a fashion as possible to the remaining pumps.
  • the plunger 17 In order after assembly of the pump into its bore in the cylinder head, to effect the required adjustment, the plunger 17 needs to be set in a datum position. From the datum position in which the plunger is shown in the drawing, there will be a predetermined inward movement of the plunger necessary before the drilling 27 moves out of register with the groove 26. This movement is indicated by the arrows A in the drawing.
  • an adjustable abutment in the form of a flanged ring 40 which is provided with an internal screw thread and which is engaged with the threaded portion of the annular member 34.
  • the flange 41 of the ring is engagable with a step 41A defined on the peripheral surface of the tubular part 33 and by adjusting the ring on the annular member 34, the outermost position of the plunger can be adjusted.
  • a locking ring 42 is provided so that once the adjustment has been effected, the ring 40 can be secured against rotation.
  • the aperture which is formed in the flange of the ring 40 is of a keyhole shape to permit the ring to be located in the manner illustrated, about the tubular part 33.
  • the pump following its assembly is adjusted and this is conveniently carried out without the spring 37, by first moving the plunger to the position in which the circumferential groove 26 is just closed.
  • the flanged ring is then unscrewed a predetermined number of turns depending on the pitch of the screw thread until the distance "a" indicated by the arrows is established.
  • the spring is then assembled between the body 10 and the abutment 36 following which the spring is compressed to allow the tubular part to pass through the abutment, and then the ring 35 is located in position following which the spring is allowed to relax.
  • the assembled and adjusted pump will be supplied to an engine manufacturer who will assemble the pump into the cylinder head of an engine and having set the engine at a predetermined position which is appropriate for that pump, the adjuster of the rocker is tightened until the ball of the adjuster binds in the recess 30. The adjuster is then screwed through a predetermined number of turns which will move the plunger inwardly by a known small amount following which the adjuster is locked and the process repeated for the remaining pumps. As stated the drawing shows the plunger in the datum position and when assembled and adjusted. When the pump is in the engine and the adjustment- as described carried out, there will be a small clearance between the flange 41 and the step on the tubular part 33. The distance "a" indicated by the arrows will be- reduced by the amount of the aforesaid gap.
  • Figure 2 shows two modifications over the arrangement of Figure 1.
  • the annular member 34 is again shown to be integral with the pump body 10 but in the right hand portion, the annular member 34A is shown to be a separate item to the body and is located about a spigot portion of the body.
  • the annular member 34A will be retained relative to the body by means of a screw 34B in order to ensure that the plunger together with the associated parts are retained relative to the body in transit.
  • the main modification to the example of Figure 1 and which is shown in Figure 2, is to the annular part 33A.
  • the tubular part 33A is formed with a small inturned flange 47 the aperture through which is slightly greater in diameter than that of the plunger.
  • the flange 47 defines a step against which is located a generally C-shaped washer 44 which is located against the head of the plunger.
  • the push piece 32 in Figure 1 is omitted and the push member 31A extends into engagement with the plunger and at its end adjacent the spring abutment 36, is substantially flat for engagement by a shoe associated with a rocker of the engine.
  • an elongated slot 45 in which is located a ball 46 which is engagable with the end of the slot and also with a shaped step formed on the adjustable member 40A.
  • the push member 31A is waisted intermediate its ends to provide for relative movement of the ball and the walls of the slot as the plunger is moved inwardly. Adjustment is effected in the same way as described with reference to Figure 1.
  • FIG 3 shows a modification in which the tubular part " 33B transmits the force exerted by the push member 31 to the plunger.
  • the tubular part has an insert 44 secured therein to facilitate manufacture as compared with the example which is shown in Figure 4 in which the push member (not shown) is engaged directly with the tubular part 33C.
  • tubular parts 33B and 33C are provided with the fork 38 as in the example of Figure 1.

Landscapes

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

Abstract

Une pompe d'injection de carburant à piston à mouvement alternatif comprend un piston (17) pouvant coulisser dans un passage (16) se trouvant dans un corps (10). Une pièce tubulaire (34) entoure de manière espacée la partie du piston qui fait saillie à partir du passage. Un élément annulaire (33) pouvant coulisser dans la pièce tubulaire est accouplé au piston (17) et porte un élément de butée (36) de ressort. Un élément réglable (40) monté sur la partie tubulaire (34) présente, selon un exemple, un rebord (41) tourné vers l'intérieur pouvant prendre appui sur un gradin (41A) se trouvant sur l'élément annulaire (33) pour déterminer ce qu'on appelle une position de référence.
PCT/GB1991/002024 1990-12-11 1991-11-18 Pompe d'injection de carburant Ceased WO1992010668A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9026841.8 1990-12-11
GB909026841A GB9026841D0 (en) 1990-12-11 1990-12-11 Fuel injection pump

Publications (1)

Publication Number Publication Date
WO1992010668A1 true WO1992010668A1 (fr) 1992-06-25

Family

ID=10686792

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/002024 Ceased WO1992010668A1 (fr) 1990-12-11 1991-11-18 Pompe d'injection de carburant

Country Status (2)

Country Link
GB (1) GB9026841D0 (fr)
WO (1) WO1992010668A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0597249A1 (fr) * 1992-11-07 1994-05-18 Robert Bosch Gmbh Dispositif d'injection de combustible, in particulier pompe-injecteur pour moteurs à combustion interne
GB2330626A (en) * 1997-10-22 1999-04-28 Caterpillar Inc Tappet retention for a fuel injector

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027441A1 (fr) * 1979-10-15 1981-04-22 Friedmann & Maier Aktiengesellschaft Pompe d'injection pour moteurs diesel
GB2113775A (en) * 1982-01-15 1983-08-10 Bosch Gmbh Robert Fuel injection pump

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027441A1 (fr) * 1979-10-15 1981-04-22 Friedmann & Maier Aktiengesellschaft Pompe d'injection pour moteurs diesel
GB2113775A (en) * 1982-01-15 1983-08-10 Bosch Gmbh Robert Fuel injection pump

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0597249A1 (fr) * 1992-11-07 1994-05-18 Robert Bosch Gmbh Dispositif d'injection de combustible, in particulier pompe-injecteur pour moteurs à combustion interne
US5402764A (en) * 1992-11-07 1995-04-04 Robert Bosch Gmbh Fuel injection pump for internal combustion engines
GB2330626A (en) * 1997-10-22 1999-04-28 Caterpillar Inc Tappet retention for a fuel injector
US6209798B1 (en) 1997-10-22 2001-04-03 Caterpillar Inc. Tappet retention for a fuel injector

Also Published As

Publication number Publication date
GB9026841D0 (en) 1991-01-30

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