EP0438871B1 - Kraftstoffpumpenvorrichtung - Google Patents

Kraftstoffpumpenvorrichtung Download PDF

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Publication number
EP0438871B1
EP0438871B1 EP19900313108 EP90313108A EP0438871B1 EP 0438871 B1 EP0438871 B1 EP 0438871B1 EP 19900313108 EP19900313108 EP 19900313108 EP 90313108 A EP90313108 A EP 90313108A EP 0438871 B1 EP0438871 B1 EP 0438871B1
Authority
EP
European Patent Office
Prior art keywords
lever
support
engine
resilient means
fuel
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.)
Expired - Lifetime
Application number
EP19900313108
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English (en)
French (fr)
Other versions
EP0438871A1 (de
Inventor
Peter James Parr
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 EP0438871A1 publication Critical patent/EP0438871A1/de
Application granted granted Critical
Publication of EP0438871B1 publication Critical patent/EP0438871B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F02D1/02—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered
    • F02D1/04—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered by mechanical means dependent on engine speed, e.g. using centrifugal governors
    • 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
    • F02D1/02—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered
    • F02D1/04—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered by mechanical means dependent on engine speed, e.g. using centrifugal governors
    • F02D1/045—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered by mechanical means dependent on engine speed, e.g. using centrifugal governors characterised by arrangement of springs or weights

Definitions

  • This invention relates to a fuel pumping apparatus for supplying fuel to an internal combustion engine and of the kind comprising a high pressure pump which is driven in timed relationship with an associated engine, a fuel quantity control operable to determine the quantity of fuel delivered by the high pressure pump to the associated engine, a mechanical governor mechanism for determining the setting of said quantity control, said governor mechanism comprising a lever pivotally mounted intermediate its ends, a centrifugal weight mechanism acting on one end of the lever, a linkage connecting the lever to said quantity control whereby with increasing engine speed the quantity control member will be operated to reduce the amount of fuel delivered to the associated engine, resilient means acting to oppose the movement of the lever by the weight mechanism, the force exerted by said resilient means being adjustable to determine the speed of the associated engine and a further lever pivotally mounted at one end on a support and being coupled to said first mentioned lever at a first position spaced from the support, said resilient means being coupled to said further lever at a second position spaced from said support so that the force exerted by the resilient means is transmitted through the further lever
  • the resilient means will comprise a spring one end of which is operatively connected to the lever and the other end of which is coupled to an adjustable member which in the case of a vehicle, is connected to the throttle pedal of the vehicle.
  • the engine will assume a speed depending upon the applied load and as the load varies the engine speed will vary and the governor mechanism will adjust the amount of fuel supplied to the engine.
  • the governor mechanism can vary the fuel between a minimum which may be zero, and a maximum amount, the latter being determined by a maximum fuel stop and the variation in engine speed which has to take place to accomplish the aforesaid variation in fuel supply is known in the art as the "droop".
  • the droop of the governor mechanism is determined by the effective rate of the spring and this is determined during manufacture of the spring. Although every effort may be made to produce springs having the same rate there will nevertheless be differences which will result in variations in the droop between governor mechanisms which incorporate the springs. Moreover, the required value of the droop will depend upon the engine application. For example, where the engine is driving a vehicle it is desirable that there should be an appreciable variation of speed but where the engine is used to power an electrical generator the variation of speed should be very much less. Furthermore, particularly in the electrical generator application, it may be desirable to be able to adjust the droop whether or not the engine is in operation particularly where two generators are connected in parallel. Adjustment of the droop may also be required as a result of wear.
  • DE-B-1197274 shows a governor mechanism incorporating two levers which carry the force exerted by the governor spring so that it can oppose the force produced by the centrifugal weights.
  • a further spring is provided and in one example is interposed between the two levers. The additional spring acts to modify the operation of the governor mechanism under certain conditions of the operator demand.
  • the object of the invention is to provide a fuel pumping apparatus in a simple and convenient form in which the droop of the governor mechanism can be adjusted.
  • the further lever and said first mentioned lever are in direct engagement with each other at said first position and said support is adjustable to alter the distance between said first position and said support thereby to vary the effective rate of the resilient means as applied to the first mentioned lever.
  • the apparatus comprises a high pressure pump 10 having outlets 11 for connection to the injection nozzles of the associated engine.
  • Fuel is supplied to the high pressure pump by a low pressure pump 12 by way of an adjustable quantity control in the form of a throttle 13.
  • the pump 10 is driven by means of a drive shaft the axis of which is indicated at 14.
  • Such an apparatus can be a rotary distributor type of fuel pumping apparatus.
  • a governor mechanism generally indicated at 15 is provided and this comprises a plurality of centrifugal weights 16 which are located in a cage 17 mounted on the drive shaft. The weights engage through a thrust bearing not shown, with a sleeve 18 slidable on the drive shaft and the sleeve engages one end of a pivotal lever 19 the pivot point for which is indicated at 20.
  • the lever 19 is coupled to the throttle 13 in such a manner that as the weights move outwardly with increasing engine speed, the throttle will move to reduce the amount of fuel which is supplied to the high pressure pump 10.
  • the end of the lever 19 remote from the sleeve 18 is deformed to define a curved portion 21 which is engaged by a further lever 22 pivotally mounted at 23 on an adjustable support member 24, the member 24 being movable towards and away from the axis 14 of the drive shaft.
  • the member 24 is of cylindrical form but has a portion of non-circular section which extends through an aperture of complementary shape formed in a housing 27 having a cylindrical bore.
  • the member is provided with a screw threaded aperture 28 in which is engaged a complementarily screw threaded rod 29 extending from the end of an axially fixed but rotatable member 30 mounted in the housing 27.
  • the member 30 is held against axial movement by a pin 30A which is secured within the housing 27 and locates in a circumferential groove in the member. By rotating the member 30 the adjustable member 24 will move towards or away from the axis 14 of the drive shaft and the pivot point 20 of the lever 19. In this manner the point of engagement of the lever 22 with the curved portion 21 of the lever 19 can be varied.
  • the member 30 can be secured in position by means of a locknut 30B which is engagable with a washer engaging the housing 27.
  • the governor mechanism also includes a governor spring 31 and this is in the form of a coiled tension spring one end of which is connected to an operator adjustable member 32 and the other end of which is connected to a spring abutment 33.
  • the spring abutment also includes an idling spring 34 which in known manner, can be compressed a limited extent as the engine speed increases above the idle speed.
  • the idling spring is located between the abutment and a shoe 35 having a curved surface which is located against a curved surface on the lever 22. Both the shoe and the lever define apertures through which extends a rod connecting the spring abutment with the spring 31.
  • the maximum amount of fuel which can be supplied by the high pressure pump 10 to the associated engine is determined by limiting in known manner, the maximum pumping stroke of the pumping plunger or plungers of the pump 10.
  • the governor droop can be adjusted to suit the particular engine application and furthermore, the droop can be adjusted with the engine in operation.
  • the weights 16 will be collapsed and the lever 19 will be moved in the clockwise direction to effect an increase in the amount of fuel supplied to the engine.
  • the engine speed will therefore increase until a new equilibrium speed is established.
  • variation in the load applied to the engine for a given setting of the operator adjustable member 32 will result in a variation in engine speed with the lever 19 moving in the clockwise direction if the speed decreases, thereby resulting in an increase in the supply of fuel to the engine and in the anti-clockwise direction if the engine speed should increase thereby resulting in a decrease in the amount of fuel supplied to the engine.
  • the effective rate of the spring 31 as applied to the lever 19 and which varies the governor droop, can be altered by adjustment of the adjustable member 24 towards or away from the axis 14 of the drive shaft. This adjustment can be carried out with the engine running if so required. In the example if the adjustable member 24 is moved upwardly the effective spring rate is reduced and vice versa.
  • the lever 22 defines a part spherical recess in which is located the shoe 35 having a spherical surface engaging the surface of the recess and a flat surface which is engaged by one end of the spring 34.
  • the levers 19 and 22 move about their respective pivots the surfaces of the shoe and recess move relative to each other.
  • FIG. 2 An alternative form of shoe is seen in Figure 2 which shows to an enlarged scale a section through the modified lever 22A and a side view of the modified shoe 35A.
  • the lever 22A defines a pair of "V" grooves 36 on opposite sides of a through aperture and the shoe 35A defines on opposite sides of a through aperture a pair of knife edges 37 having a smaller included angle than the grooves.
  • FIG. 3 An alternative form for the point of engagement between the levers 19 and 22 is seen in Figure 3.
  • a slide 38 having a pair of spaced side limbs 39 which locate on opposite edges of the lever 22A so that the slide is guided for movement along the length of the lever.
  • the lever 19A is provided with an end portion 40 which extends towards the lever and is provided with a radiused end which locates within a transverse recess in the face of the slide remote from the limbs.
  • the recess is radiused having a radius which is slightly larger than that of the end of the lever 22A.
  • the slide is provided with an elongate slot which coincides with the through aperture in the lever 22A.
  • a further modification not shown, is the replacement of the pin 30A which secures the member 30 against axial movement, by a circlip which bears against a shoulder defined on the member and which is located within a groove formed in the bore in the housing 27.
  • modified shoe 35A and the lever 22A reduces the friction between the part spherical surfaces of the shoe 35 and lever 22. Such friction may be appreciable even though the surfaces may be lubricated, and can reduce the sensitivity of the governor to changes of engine speed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)

Claims (7)

  1. Kraftstoffpumpvorrichtung für die Kraftstoffzufuhr an eine Brennkraftmaschine, mit einer Kraftstoffmengensteuerung (13), die zur Steuerung der durch eine Hochdruckpumpe (10) an die Brennkraftmaschine geförderten Kraftstoffmenge beweglich angeordnet ist, einem mechanischen Regelmechanismus (15) zur Bestimmung der Einstellung der Kraftstoffmengensteuerung, wobei der Regelmechanismus einen zwischen seinen Enden gelenkig angeordneten Hebel (19, 19A), einen auf ein Ende des Hebels einwirkenden Fliehgewichtsmechanismus (16, 17, 18), eine Verbindung zwischen dem Hebel (19, 19A) und der Kraftstoffmengensteuerung (13), durch welche die Kraftstoffmengensteuerung mit steigender Drehzahl zur Reduzierung der an die zugehörige Brennkraftmaschine geförderten Kraftstoffmenge betätigt wird, ein der Bewegung des Hebels (19, 19A) durch den Fliehgewichtsmechanismus entgegenwirkendes elastisches Element (31), wobei die durch das elastische Element ausgeübte Kraft zur Bestimmung der Brennkraftmaschinendrehzahl einstellbar ist, und einen weiteren Hebel (22, 22A) aufweist, der an einem Ende an einer Halterung (24) gelenkig angeordnet und mit dem zuerst erwähnten Hebel (19, 19A) an einer von der Halterung beabstandeten ersten Stelle gekoppelt ist, wobei das elastische Element (31) mit dem weiteren Hebel (22, 22A) an einer von der Halterung (24) beabstandeten zweiten Stelle derart gekoppelt ist, daß die durch das elastische Element (31) ausgeübte Kraft über den weiteren Hebel auf den zuerst erwähnten Hebel übertragen wird,
    dadurch gekennzeichnet, daß
    der weitere Hebel (22, 22A) und der zuerst erwähnte Hebel (19, 19A) an der ersten Stelle in direktem Eingriff miteinander stehen und daß die Halterung (24) zur Veränderung des Abstandes zwischen der ersten Stelle und der Halterung und damit der Hebelwirkung der beiden Hebel einstellbar ist, um so den auf den zuerst erwähnten Hebel (19, 19A) ausgeübten Wirkungsbereich des elastischen Elements (31) zu verändern.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das elastische Element (31) mit dem weiteren Hebel (22, 22A) über einen Schuh (35, 35A) gekoppelt ist, der in bezug auf den weiteren Hebel verschwenkbar ist.
  3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß daß der Schuh (35) eine Schneidkante (37) bildet, die in einer in dem weiteren Hebel (22A) ausgebildeten V-Nut (36) in Eingriff bringbar ist.
  4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß einer der Hebel (19, 22) ein mit dem anderen Hebel in Eingriff bringbares gebogenes Endteil (21) aufweist.
  5. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß zwischen den Hebeln (19A, 22A) ein Gleitstück (38) angeordnet ist, das auf einem der Hebel verschiebbar ist, während der andere Hebel ein abgerundetes Endteil (40) aufweist, das in einer Aussparung im Gleitstück angeordnet ist.
  6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß das Gleitstück (38) ein Paar von beabstandeten Seitenschenkeln (39) aufweist, die an gegenüberliegenden Kanten des einen Hebels anliegen.
  7. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Halterung ein in einem Gehäuse (27) verschiebbares Haltebauteil (24), Mittel zur Verhinderung der Drehung des Bauteils innerhalb des Gehäuses, eine Gewindebohrung in dem Haltebauteil (24) und ein axial fixiertes Drehteil (30) aufweist, das in dem Gehäuse angeordnet ist und eine in die Bohrung eingreifende Gewindestange (29) trägt, wodurch eine Drehung des Drehteils (30) zu einer Axialbewegung des Haltebauteils (24) führt, und zwar auf den Gelenkpunkt (20) des ersten Hebels (19) zu oder von diesem weg.
EP19900313108 1990-01-20 1990-12-03 Kraftstoffpumpenvorrichtung Expired - Lifetime EP0438871B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB909001372A GB9001372D0 (en) 1990-01-20 1990-01-20 Fuel pumping apparatus
GB9001372 1990-01-20

Publications (2)

Publication Number Publication Date
EP0438871A1 EP0438871A1 (de) 1991-07-31
EP0438871B1 true EP0438871B1 (de) 1994-02-23

Family

ID=10669664

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900313108 Expired - Lifetime EP0438871B1 (de) 1990-01-20 1990-12-03 Kraftstoffpumpenvorrichtung

Country Status (3)

Country Link
EP (1) EP0438871B1 (de)
DE (1) DE69006843T2 (de)
GB (1) GB9001372D0 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT412508B (de) 2002-01-10 2005-03-25 Gaston Glock Verfahren und vorrichtung zur herstellung einer laufmarkierung sowie lauf, hergestellt mit diesem verfahren

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1197274B (de) * 1959-04-15 1965-07-22 Friedmann & Maier Ag Regeleinrichtung mit Fliehgewichtsregler fuer Kraftfahrzeug-Einspritzbrennkraftmaschinen
DE1912919A1 (de) * 1969-03-14 1970-09-24 Bosch Gmbh Robert Drehzahlregler fuer Kraftstoffeinspritzpumpe
GB1459412A (en) * 1973-03-06 1976-12-22 Cav Ltd Liquid fuel injection pumping apparatus
JPS5650117Y2 (de) * 1977-07-06 1981-11-24
DE3405540A1 (de) * 1984-02-16 1985-08-22 Robert Bosch Gmbh, 7000 Stuttgart Drehzahlregler fuer kraftstoffeinspritzpumpen

Also Published As

Publication number Publication date
DE69006843T2 (de) 1994-06-09
GB9001372D0 (en) 1990-03-21
DE69006843D1 (de) 1994-03-31
EP0438871A1 (de) 1991-07-31

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