GB2268815A

GB2268815A - Fuel-injection pump for internal combustion engines

Info

Publication number: GB2268815A
Application number: GB9313580A
Authority: GB
Inventors: Michael Scharf; Manfred Schwarz
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 1992-07-02
Filing date: 1993-07-01
Publication date: 1994-01-19
Anticipated expiration: 2013-07-01
Also published as: FR2693232B1; FR2693232A1; GB9313580D0; JPH06147048A; GB2268815B; DE4221750A1

Abstract

The fuel-injection pump comprises a fuel quantity regulating member (12) which is engaged by a tensioning lever (15) of a centrifugal governor (18), the lever having a stop (32) for delimiting the maximum quantity of fuel injected during full-load operation. The stop (32) is formed at a lever arm end of a full-load tension lever (33), which is pivotably mounted on an axle (35) on which an idling tension lever (55) is also pivotable mounted. The full load tension lever (33) and idling tension lever (55) can be adjusted by a linear actuator (38) in dependence upon the operating parameters of the internal combustion engine. The full load lever (33) has stops (44, 45) to determine maximum and minimum fuel quantity, respectively, during full load operation. Stop (45) is also engageable by the idling lever (55) to determine maximum fuel quantity during idling. <IMAGE>

Description

2268815

DESCRIPTION

FUEL-INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES The invention relates to a fuel-injection pump for internal combustion engines.

A fuel-injection pump is known from DE 41 22 773 A1 which comprises a fuel quantity regulating member in the form of an annular slide which can be displaced on a pump piston and a regulating member of a governor formed as a governor lever engaging the annular slide. The regulating member is formed as a two-piece lever and can be adjusted by virtue of a centrifugal governor against the force of a governor spring. The regulating member is associated with a stop, by means of which the maximum quantity of injected fuel is delimited. The stop is formed on a two-armed fullload tension lever pivotably mounted on an axle formed as an eccentric shaft. The two-armed full-load tension lever is loaded by a return spring in the direction which reduces the quantity of injected fuel and the two-armed full-load tension lever can be adjusted by virtue of a linear actuator against the force of the return spring in dependence upon the operating parameters of the driven internal combustion engine having the fuel-injection pump.

A stop is provided in each case for the fuel-load tension lever, by means of which a minimum and a i&mimtm camity g# faci injoetod during tho fulizlogd operation is determined. In addition to this, the fuel-injection pump comprises a two-armed idling tension lever which serves to regulate the quantity of injected fuel when the internal combustion engine is idling. The idling tension lever is pivotably mounted on its own axle formed as an adjustable eccentric shaft. The idling tension lever is influenced by a return spring in the direction which increases the quantity of injected fuel and the idling tension lever can be adjusted by virtue of the linear actuator against the force of the return spring in dependence upon the operating parameters of the internal combustion engine. The-idling tension lever is provided in each case with a stop, by means of which a maximum and a minimum quantity of injected fuel is predetermined when the internal combustion engine is idling. The full-load tension lever and the idling tension lever are disposed spatially offset on axes which requires a large installation space for the fuel-injection pump. In contrast to a conventional, mechanically controlled fuel-injection pumps, four additional separate stops must be adjusted additionally at the same time. Furthermore, two additional eccentric drives are necessary, which must be adjusted precisely with a little dispersion owing -3to the uniform transition from the idling operation to the full-load control operation and vice versa. This represents costly and expensive adjusting processes.

In accordance with the present invention there is provided a fuelinjection pump for internal combustion engines having a fuel quantity regulating member which is engaged by a regulating member of a governor and the regulating member being adjustable by a centrifugal governor against the force of a governor spring, a stop associated with the regulating member for the purpose of delimiting the maximum quantity of injected fuel, the stop being formed cn a two-armed full-load tension lever which can be adjusted in dependence upon the operating parameters of the internal combustion engine by an actuator controlled by a control device against the force of a return spring functioning in the direction which reduces the maximum quantity of injected fuel, a stop which determines a minimum quantity of fuel injected during the full-load operation and a stop which determines a maximum quantity of fuel injected during the full-load operation being provided for the two-armed full-load tension lever. and a two-armed idling tension lever for the purpose of regulating the quantity of fuel injected during the idling operation of the internal combustion engine, the two-armed idling tension lever -4being adjustable in dependence on the operating parameters of the internal com6ustion enqihd by tha actuator against the force of a return spring which functions in the direction which increases the quantity of injected fuel, and a stop, which determines a maximum quantity of fuel injected during the idling operation, being provided for the two-armed idling tension lever, wherein the full-load tension lever and the idling tension lever can be adjusted alternately by the actuator. and the full-load tension lever and the idling tension lever are pivotably mounted about a common axis.

This has the advantage. that the installation space is reduced and the structure is simplified, as because only one fixed axis is required for the fullload tension lever and the idling tension lever.

Preferably, the full-load minimum quantity stop for the full-load tension lever and the idling maximum quantity stop for the idling tension lever are formed on opposite sides of a component.

This arrangement of stops, on a single part, means that a costly and independent adjustment of these stops is not necessary. The part which forms the stops can be adjusted during the assembly of the fuel-injection pump and does not require any subsequent readjustment.

Preferably, the return spring engages the fullload tension lever by way of a spring plate and the spring plate comprises a predetermined adjusted thickness and for the purpose of delimiting the maximum full-load injection quantity, the full-load tension lever moves into position by way of the spring plate against a part fixed to the housing in the direction which increases the maximum quantity of injected fuel. Therefore, it is possible to set the maximum quantity of fuel injected during the full load operation by the spring plate.

Preferably, the idling tension lever cooperates with an idling spring arrangement which engages the regulating member by way of a connecting element, and the idling spring arrangement is supported on the one side at the idling tension lever and on the other side, at an adjustable support piece which renders it possible to carry out the initial adjustment of the quantity of fuel to be injected from outside the pump housing. Therefore, the quantity of fuel injected during the idling operation can be adjusted from outside at the usual place.

By way of example only specific embodiments of the present invention will now be described, with reference to the accompanying drawings, in which:fig, 1 illuotrateo a oiigpllilwg isillial yliw 91 a fuel-injection pump constructed in accordance with one embodiment of the present invention; and Fig. 2 illustrates a fuel-injection pump constructed in accordance with a second embodiment of the invention.

A fuel-injection pump (illustrated greatly simplified in Fig. 1) for internal combustion engines, preferably self-ignition internal combustion engines, comprises a pump piston 10 which is driven in a rotating and simultaneously reciprocating movement by a means (not illustrated). The pump piston 10 defines a pump working chamber (not illustrated), a relief duct 11 extending in the pump piston 10 leads off from the pump working chamber to the surface of the pump piston 10 and covers or reveals there an annular slide 12 disposed as a fuel quantity regulating member. During the reciprocating movement of the pump piston 10 and upon completion of a predetermined stroke according in each case to the position of the annular slide 12, the relief duct 11 is opened earlier or latert causing the termination of the fuel-injection. The axial position of the annular slide 12 therefore determines the quantity of injected fuel.

A two-armed tensioning lever 15 as a regulating member having an arm which is pivotable about an axis -717, engages the annular slide 12.by way of a spherical head 14. A centrifugal governor 18 (illustrated in a simplified manner) engages the other arm of the tensioning lever 15 with a force which is dependent upon the rotational speed. The centrifugal governor 18 is preferably a flyweight governor and is driven synchronously with the rotational speed of the pump. In addition, a governor spring 20 and an idling spring arrangement 21 engage this arm of the tensioning lever 15.

The tensioning lever 15 comprises in its end region a bore through which a pin 23 is guided, the pin 23 comprises at its end a head 29 and a tensioning spring 30, which is formed as a compression spring, is disposed between the pin 23 and the tensioning lever 53. The tensioning spring 30 has a torque-control function of the adjusted quantity of injected fuel in dependence upon rotational speed. The governor spring 20 engages the other end of the pin 23 by way of a spriDg plate 24. The governor spring 20 is formed as a compression spring and is tensioned between the spring plate 24 and a connecting part 26 which is connected by way of an eccentric or a lever arm to a regulating lever 27 disposed outside the fuelinjection pump and the regulating lever 27 serves to adjust the quantity of injected fuel. The governor -8spting 20 awlel alga be formed ag a tension spring.

The tensioned compression spring 20 effects the adjustment of the tensioning lever 15 by virtue of the force of the centrifugal governor dependent upon rotational speed opposite to the direction which increases the quantity of injected fuel and is compressed for the purpose of regulating the quantity of injected fuel when the final rotational speed is achieved. In the full-load position, or rather in the case of a corresponding adjustment of the regulating lever 27, the tensioning lever 15 is located at the same time, being under the influence of the governor spring 20, in position at a stop 32, which is formed on a lever arm end of a two-armed full-load tension lever 33.

The full-load tension lever 33 is pivotably mounted on an axle 35 which is fixed to the housing, wherein an adjusting element 36 of a actuator 38 engages the other lever arm end of the full-load tension lever 33. The actuator 38 is formed here as a linear actuator, it could, however, also be formed as a rotating actuator, wherein the adjusting element is rotated for the purpose of carrying out the adjustment. The adjusting element 36 is formed as a rod which is penetrated by a transverse pin 37 which engages the full-load tension lever 33 in the -9direction which adjusts the stop 32 for the purpose of increasing the quantity of full-load injected fuel. A return spring 42 is tensioned between the full-load tension lever 33 and a fixed part, for example the housing 41 of the actuator 38. The return spring 42 influences the full- load tension lever 33 in the direction which reduces the quantity of fuel injected during the full-load operation and the pretensioning of the return spring 42 is greater than the pretensioned force of the governor spring 20. A spring plate 44 having a predetermined thickness is disposed between the return spring 42 and the fullload tension lever 33 and the spring plate 44 serves to define the travel of the full-load tension lever 33 in the direction which increases the quantity of fuel injected during the.full-load operation, wherein the full-load tension lever 33 moves into position at the housing 41 by way of the spring plate 44. It is therefore possible by suitably selecting the thickness of the spring plate 44, to limit the maximum quantity of fuel injected during the full- load operation to the admissible value.

Moreover, the spring plate 44 can serve as a zeroizing stop for the actuator 38, wherein the adjusting element 36 is brought into position against the housing 41 by way of the spring plate 44 each time -10the fuel-injection pump starts up. so that a defined starting position is predetermined for the subsequent adjustment of the actuator 38. The travel of the full-load tension lever 33 in the direction which reduces the quantity of fuel injected during the fullload operation is defined by a stop 45, which is preferably formed as an eccentric attached in an adjustable manner to the housing of the fuel-injection pump. The actuator 38 is preferably formed as a step motor which is actuated by a control device 39 (only illustrated symbolically) in which the various operating parameters of the driven internal combustion engine having the fuelinjection pump are processed, such as, for example, load, temperature, charging pressure etc. The control device 39 holds the fullload tension lever in a position which corresponds to the maximum permissible quantity of fuel injected during the full-load operation under the actual operating parameters of the internal combustion engine.

For the purpose of connecting the idling spring arrangement 21 to the tensioning lever 15. the tensioning lever 15 comprises a further bore, through which is guided a pin 47 and the idling spring arrangement 21 engages the pin 47. The idling spring arrangement 21 comprises two pretensioned compression -11springs 49 and 50, wherein the compression spring 49 is supported on the one side on a spring plate 52 which is fixed in the region of the end of the pin 47 lying opposite the tensioning lever 15 and at the other side on a shoulder in a support piece 53 formed as a sleeve. The pin 47 together with the spring plate 52 are displaceable within the sleeve 53. The compression spring 50 is likewise supported on the one side on the spring plate 52 and on the other side, if necessary likewise by way of a spring plate, on a lever arm end of a two-armed idling tension lever 55. The lever arm end of the idling tension lever 55 is formed in the shape of a fork and overlaps the pin 47. The pin 47 penetrates a bore in a carrier 48 attached at the tensioning lever 15 and the pin 47 lies with its head 51 against the side of the carrier 48 lying opposite the idling spring arrangement 21. At the same time, the tensioning lever 15 is pulled against the centrifugal governor 18 by virtue of the idling spring 49 by way of the head 48 of the pin 47 engaging the tensioning lever 15. At the same time. the pretensioning force of both springs 499 and 50 is exerted on the spring plate 52 and therefore by way of the pin 47 on'the tensioning lever 15. The idling tension lever 55 is pivotably mounted on the same axle as the full-load tension lever 33. The adjusting -12element 36 of the actuator 38 engages at the other lever arm end of the idling tension lever 55. A return spring 58 is tensioned between the idling tension lever 55 and the housing 56 of the fuelinjection pump and the return spring 58 influences the idling tension lever 55 by virtue of the actuator 38 against the adjusting direction. The return spring 58 comprises at the same time a greater pretensioning force than the idling spring 50. The travel of the idling tension lever 55 is delimited by a stop in the o pposite direction to the adjusting direction by virtue of the actuator 38 and the stop is formed preferably on the same Dart as the stop 45 for the full-load tension lever 33, but on the opposite side of the stop 45. There is no stop for delimiting the travel of the idling tension lever 55 in the adjusting direction of the actuator 38. A fixed stop could lead to a malfunction of the actuator 38, if the actuator 38 were to push the idling tension lever 55 against a fixed stop and the adjusting element 36 is no longer able to perform a movement in the adjusting direction. It is possible when using a step motor, for example, to predetermine in the control device a maximum number of steps, which the actuator or step motor 38 must not exceed. so that the idling tension lever 55 is at a safe distance from the pump housing.

When adjusting the idling tension lever 55 by virtue of the actuator 38. one of the supports of the idling spring 50 is adjusted. It is possible by virtue of the actuator 38 to reduce the quantity of fuel injected during the idling operation based on the quantity predetermined by the stop 45, in that the adjusting element 36 of the actuator 38 moves the idling tension lever 55 against the force of the return spring 58. At the same time. the support of the idling spring 50 is adjusted in the sense that its pretensioning is reduced so that the-force exerted on the tensioning lever 55 by way of the pin 47 is reduced and the tensioning lever 15 is adjusted by virtue of the centrifugal governor 18. The annular slide 12 is adjusted at the same time in the sense of reducing the quantity of injected fuel. The quantity of fuel injected during the idling operation can be regulated for the purpose of maintaining a constant idling rotational speed of the internal combustion engine by virtue of the control device actuating the actuator 38 in dependence upon the operating parameters. In this way, the necessary quantity of fuel injected during the idling operation is greater, for example, when operating auxiliary devices such as air-conditioning compressors, lighting devices or cooling fans, in order to ensure a steady idling -14operation. If no auxiliary devices are being operated, then the quantity of fuel injected during the idling operation can be reduced accordingly by virtue of the actuator 38.

The sleeve 53 of the idling spring arrangement 21 can be axially adjusted from the outside of the housing of the fuel-injection pump and for this purpose is mounted, for example, on air eccentric, which enables the initial adjustment of the quantity of injected fuel for the idling operation to be carried out. When adjusting the sleeve 53, the support of the compression spring 49 is adjusted relative to the position of the spring plate 52, so that the pretensioning of the compression spring 49 is changed. At the same time, the pin 47 is displaced in the case of an otherwise unchanged. Forces, which cause the position of the tensioning lever 15 to change the tensioning lever 15 is pivoted under influence of the force of the centrifugal governor 18 and under the force of the idling spring 49 which is changed during the adjustment. The quantity of injected fuel is changed at the same time by way of the tensioning lever 15 engaging the annular slide 12. When increasing the pretensioning of the idling spring 49, the quantity of fuel injected during the idling operation is at the same time increased and on the -is- conversey the quantity reduces, when the pretensioning is reduced. The position of the idling tension lever 55 remains unchanged relative to the housing of the fuel-injection pump in the case of the aforementioned initial adjustment of the quantity of fuel injected during the idling operation. The lever arm of the idling tension lever 55 engaging the compression spring 50 delimits the travel of the pin 47 in the direction which reduces the quantity of fuel injected during the idling operation.

When starting up the internal combustion engine, no force is exerted on the tensioning lever 15 by virtue of the centrifugal governor 18. The tensioning lever 15 is therefore pulled against the stop 32 by virtue of the governor spring 20, acting on the tensioning lever 15, and the idling spring 49. At the same time. the full-load tension lever 33 is adjusted by virtue of the actuator 38 in dependence upon the temperature of the internal combustion engine. so that the quantity of start-up fuel necessary in each case is set. It is therefore not necessary for the purpose of controlling the quantity of start-up fuel, to provide a starting spring or an additional starting lever, so that the governor lever of the fuelinjection pump is of a particularly simple construction, as only the tensioning lever 15 is required.

During the idling operation of the internal combustion engine, the governor spring 20 is displaced in the direction which reduces the quantity of injected fuel, the tensioning lever 15 is raised from the full-load stop 32 and loaded only by the idling spring 49 which influences the tensioning lever 15 by way of the pin 47.

For the purpose of adjusting the influence on the quantity of fuel injected during the idling operation. the idling tension lever 55 is moved at the same time by virtue of the adjusting element 36 of the actuator 38 in the position illustrated in Fig. 1 and out of this position further towards the left. The full-load tension lever 33 which no longer follows the adjusting element 36 is influenced by the return spring 42 and rests against the stop 45. so that the quantity of fuel injected during the full-load operation is limited to a minimum value. This adjustment of the full-load tension lever 33 is also effective for an emergency operation, when the actuator 38 has a defect in the idling position and no longer carries out the adjusting process. Consequently. it is also ensured that when changing from the idling operation via the partial load operation into the full-load operation by virtue of -17correspondingly adjusting the adjusting lever 27 and the governor spring 20, not too much fuel is injected, which would cause a surge of smoke.

If. during the load operation, the quantity of fuel injected during the full-load operation is controlled by virtue of the actuator 38, then the adjusting element 36 of the actuator 38 moves towards the right from the position illustrated in Fig. 1, causing the full-load tension lever 33 likewise to move towards the right. At the same time, the idling tension lever 55 is influenced by the return spring 58 and rests against the stop 45, so that the maximum quantity of fuel injected for the idling operation is set. Consequently, a soft changeover into the idling operation is ensured. The tensioning lever 15 can be mounted by way of the axle 17 in an adjusting lever 60 which is pivotably disposed on an axle 61 fixed to the housing. The adjusting lever 60 is at the same t held by virtue of a spring 63 against an adjusting sc--ew 64 which can be actuated from outside the pump housing.

In the case of a variant illustrated in Fig. 2, a starting lever is additionally provided. At the same time, the starting lever 66 is articulated at the annular slide 12, the starting lever 66 is pivotable about an axle 67 fixed to the housing and the centrifugal governor 18 engages the starting lever 66. The tensioning lever 15 is likewise pivotably mounted about the axle 67, wherein the governor spring 20 engages the tensioning lever 15 and the idling spring arrangement 21 engages the starting lever 66. An arm 69 which points towards the centrifugal governor 18 and which comprises a pin 70 extending transverse to the pivot direction of the starting lever 66 is disposed at the tensioning lever 15 and the arm engages the starting lever 66. The pin 70 forms a stop for the starting lever 66, so that this starting lever cannot move too far from the tensioning lever 15, causing the maximum quantity of injected fuel to be delimited when starting the internal combustion engine.

The maximum quantity of fuel is injected when starting the cold internal combustion engine. At the same time. the tensioning lever 15 is pushed into its full-load position by way of the head 29 of the pin 23 against the stop 32 formed by virtue of the lever arm of the full-load tension lever 33. The full-load tension lever 33 is moved by virtue of the actuator 38 into the position for the maximum quantity of injected fuel. The centrifugal governor 18 receives the rotational speed and moves immediately into position against the starting lever 66, which is influenced by -19the pretensioned idling spring arrangement 21. Even a low rotational speed is sufficient in order to cause the centrifugal governor 18 to become effective. The centrifugal governor 18 then displaces the starting lever 66 towards the tensioning lever 15.

When starting the warm internal combustion engine. the actuator 38 controls the tensioning lever 15 by way of the full-load tension lever 33 into the direction remote from the centrifugal governor 18. The starting lever 66 is then pulled by the idling spring arrangement 21 against the pin 70 of the tensioning lever 15 which forms a starting quantity stop for the additional quantity of fuel, in that the pin 70 is adjusted by way of the tensioning lever 15 and the stop 32 which is moved from its adjusting position for the largest quantity of fuel to be injected during the full-load operation when starting a cold internal combustion engine, into a position where a smaller quantity of fuel is injected during the full-load operation. A temperature-dependent adjustment of the stop 32 by way of the actuator 38 renders it possible, when warm-starting the internal combustion engine, to produce a temperature-dependent starting quantity which can be regulated quickly against the idling spring arrangement 21 upon receiving the rotational speed after the starting -20process. During a warm start, the quantity of additional fuel is therefore controlled in dependence upon the temperature of the internal combustion engine by way of the pin 70 at the tensioning lever 15.

During the idling operation of the internal combustion, the starting lever 66 is neither in position at the pin 70 nor in position at the tensioning lever 15, wherein its position is determined by virtue of the balance of force of the idling spring arrangement 21 engaging the tensioning lever 15 and of the centrifugal governor 18. The force exerted by virtue of the idling spring arrangement 21 by way of the pin 47 on the starting lever 66 can be changed as in the aforementioned description relating to Fig. 1 by virtue of the actuator 38 by way of the idling tension lever 55.

In the load operation, the starting lever 66 is pressed by virtue of the centrifugal governor 18 against the tensioning lever 15 and the governor spring 20 engages the tensioning lever 15. The balance of force between the governor spring and the centrifugal governor 18 determines at the same time the position of the tensioning lever 15 and the starting lever 66. The tensioning lever 15 is located in the full-load position. in position against the stop 32 whose position is predetermined by virtue of -21the actuator 38. During a regulating process, the tensioning lever 15 is raised by virtue of the centrifugal governor 18 by way of the starting lever 66 against the force of the governor spring 20 from the stop 32 in the direction which reduces the quantity of fuel injected.

In order to be able to regulate the quantity of fuel injected during the idling operation or control the quantity of fuel injected during the fullload operation as desired, it is necessary that the control device 39 contains information regarding the operating condition of the internal combustion engine. For this purpose, a sensor 58 is provided which is actuated by virtue of the adjusting lever 27. A potentiometer which is adjusted by virtue cf the adjusting lever 27 can serve as the sensor 58. Alternatively, the adjustment travel of the adjusting lever 27 can also be delimited by virtue of an idling stop and a fullload stop respectively, wherein an end switch is provided at both stops in each case as a sensor, the end switch being actuated by virtue of the adjusting lever 27 resting against the end switch.

9LAing 1. A fuel-injection pump for internal combustion engines having a fuel quantity regulating member which is engaged by a regulating member of a governor and the regulating member being adjustable by a centrifugal governor against the force of a governor spring, a stop associated with the regulating member for the purpose of delimiting the maximum quantity of injected fuel, the stop being formed on a two-armed full-load tension lever which can be adjusted in dependence upon the operating parameters of the internal combustion engine by an actuator c6ntrolled by a control device against the force of a return spring functioning in the direction which reduces the maximum quantity of injected fuel, a stop which determines a minimum quantity of fuel injected during the full-load operation and a stop which determines a maximum quantity of fuel injected during the full-load operation being provided for the twoarmed full-load tension lever, and a two-armed idling tension lever for the purpose of regulating the quantity of fuel injected during the idling operation of the internal combustion engine, the two-armed idling tension lever being adjustable in dependence on the operating parameters of the internal combustion engine by the actuator against the force of a return -23springwhich functions in the direction which increases the quantity of injected fuel. and a stop. which determines a maximum quantity of fuel injected during the idling operation, being provided for the two-armed idling tension lever, wherein the full-load tension lever and the idling tension lever can be adjusted alternately by the actuator, and the fullload tension lever and the idling tension lever are pivotably mounted about a common axis.

2. A fuel-injection pump according to claim 1, wherein the full-load minimum quantity stop for the full-load tension lever and the idling maximum quantity stop for the idling tension lever are formed on opposite sides of a component.

3. A fuel-injection pump according to claim 2, wherein the component is an eccentric attached in the housing of the fuel-injection pump and the position of the eccentric is adjusted when assembling the fuelinjection pump.

4. A fuel-injection pump according to any preceding claim, wherein the return spring engages the full-load tension lever by way of a spring plate and the spring plate comprises a predetermined adjusted thickness and for the purpose of delimiting the maximum full-load injection quantity, the full-load tension lever moves into position by way of the spring -24plate against a part fixed to the-housIng In the direction which increases the maximum quantity of injected fuel.

5. A fuel-injection pump according to claim 4, wherein each time the fuelinjection pump is started. the actuator drives the adjusting element with the spring plate into position against the part fixed to the housing, in order to be able to determine a starting position for an adjustment of the full-load tension lever and/or the idling tension lever.

- 6. A fuel-injection pump according to any preceding claim, wherein the idling tension lever cooperates with an idling spring arrangement which engages the regulating member by way of a connecting element, and the idling spring arrangement is supported on the one side at the idling tension lever and on the other side, at an adjustable support piece which renders it possible to carry out the initial adjustment of the quantity of fuel to be injected from outside the pump housing.

7. A fuel-injection pump according to claim 6, wherein the idling spring arrangement is formed as a double compression spring arrangement whose first compression spring is stressed between the connecting element and the adjustable support piece and whose second compression spring is stressed between the connecting element and the idling tension lever.

8. A fuel-injection pump according to any preceding claim, wherein the regulating member of the governor is a tensioning lever and a starting lever. and the governor spring engages the tensioning lever and an idling spring arrangement engages the starting lever, in each case in the direction which increases the quantity of injected fuel, and the centrifugal governor engages the starting lever and the starting lever moves into position at a stop disposed on the tensioning lever after a predetermined pivot travel relative to the tensioning lever in the direction which increases the quantity of injected fuel.

9. A fuel-injection pump according to any preceding claim, wherein the governor spring is adjustable by an adjusting lever, and a sensor which detects an idling position and/or a full-load position of the adjusting lever is connected to the control device.

10. A fuel-injection pump constructed and adapted to operate substantially as hereinbefore described with reference to, and as illustrated in, the accompanying drawings.