JPH07158470A - Speed governor for fuel injection pump of internal combustion engine - Google Patents

Abstract

PURPOSE: To permit a comfortable range operation for an automobile by surely avoiding the loosening of an idling spring which is a cause of difficulty in startup. CONSTITUTION: In this speed governor, the spring end of an idling spring 27 away from a start lever acts on a compensating lever 28 which can pivot about a shaft 29, and the compensating lever 28 is supported by an arm 34 against the slider guide track 35 of a slider guide 36 rigidly connected to a tensioning lever 17. Moreover, the slider guide track 35 in this case is formed in such a manner that during pivoting of the tensioning lever 17 and resulting pivoting of the slider guide 36, the slider guide track 35 pivots the compensating lever 28 via the arm 34 so that the preload of the idling spring 27 is at least partially maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed governing device for a fuel injection pump of an internal combustion engine, which is provided with a tension lever which can rotate about an axis, and the tension lever is an accelerator pedal. According to a desired engine speed for the internal combustion engine, which is input by the driver via the engine, it is adapted to be actuated by a speed adjusting lever via an adjusting spring, which is swivelable about said axis and which has fuel injection. A start lever for moving and adjusting the injection amount adjusting member of the pump is provided, and the start lever is operated by a rotation speed transmitter, particularly a centrifugal speed governor, in a turning direction opposite to the turning direction of the tension lever, Contact the tension lever after the number of revolutions required to overcome the preload of the start spring supported between the start lever and the tension lever is obtained. Furthermore, an idling spring which acts on the start lever and is designed as a tension spring is provided which loads the start lever in a swivel direction which corresponds to the swivel direction of the tension lever. Regarding the format

[0002]

2. Description of the Prior Art In a speed governor of this type, known from EP 168 613, the end of the idling spring remote from the start lever is fixed to the casing of the injection pump. There is. The so-called casing-fixed idling spring (LFG) loads the start lever in the same swivel direction as the adjusting spring connected to the speed adjusting lever loads the tension lever, so that the fuel supply leads to a higher speed. When the rotation speed adjusting lever is moved, the idling spring relaxes. As a result, especially range driving (Rangierbetrie
At the time of careful starting performed in b) or at the time of starting on a load-increasing slope, that is, at the time of so-called hill start, a decrease in rotational speed (Drehzahleinbruch) occurs. And this drop in engine speed can only be taken up by a powerful accelerator depression or sudden fuel supply, however, such a sudden fuel supply is also associated with undesired vehicle acceleration. Therefore, starting or starting a slope in range driving is associated with great difficulty for the driver.

[0003]

SUMMARY OF THE INVENTION The object of the present invention is therefore to improve the speed governor of the type mentioned at the outset in order to reliably avoid the loosening of the idling spring, which is the cause of inconvenience or difficulty during starting. It is to enable comfortable range driving for automobiles.

[0004]

In order to solve this problem, in the structure of the present invention, the spring end of the idling spring, which is remote from the start lever, acts on the compensating lever which can pivot about the axis. The compensating lever is supported by one arm on a slide guide track of a slide guide rigidly connected to the tension lever, and in this case the slide guide track is as follows: The track pivots the compensating lever via its arm during pivoting of the tensioning lever and pivoting of the resulting slide guide, so that the preload of the idling spring is at least partially maintained. It is molded.

[0005]

The speed governor constructed according to the present invention has the following advantages over known ones. That is, in the speed governor according to the present invention, the idling spring is fixed at a position apart from the start lever, and the compensating lever is supported by the slider guide that pivots together with the tension lever. , The point of action remote from the start lever is always entrained with the tension lever connected to the rotational speed adjusting lever when the tension lever is swiveled, so that the spring preload of the idling spring remains substantially constant. . As a result, the loosening of the idling spring, which is a cause of inconvenience or difficulty at the time of starting, is reliably avoided, and a comfortable range operation for the vehicle is possible.

Further advantageous configurations of the invention are described in the dependent claims.

In a further advantageous development of the invention, the pivot axis of the compensation lever is arranged on an adjusting lever which is pivotable about a fixed axis, the lever position of which is adjusted by means of an adjusting means. It is adjustable. With such an adjusting lever, the idling spring can be adjusted and a desired idling can be adjusted.

In another configuration of the invention, the adjusting lever is constructed in the form of two arms, in which one lever arm receives the pivot of the compensating lever and the other lever arm is adjustable. The stopper is in force contact.
In this case, the force connection of the adjusting lever on the stopper is produced by a stopper spring which loads the adjusting lever in the swivel direction towards the stopper.

The adjusting lever additionally has the following possibilities:
That is, it offers the possibility of producing an increased idling speed for the specified operating conditions. For this purpose, in another advantageous configuration of the invention, the adjusting means is provided with a second
In the pivoting path of the adjusting lever as follows, i.e. after the adjusting lever has pivoted a predetermined angle against the return force of the stopper spring: It is arranged so as to contact the stopper of. The switching of the adjusting lever for producing an increased idling speed is effected in this case by means known per se for increasing the idling, which is either temperature-related or pneumatically actuated.

[0010]

Embodiments of the present invention will now be described with reference to the drawings.

In the speed control system (Drehzahlregler) shown in simplified form in the drawing, the pump plunger 10 of the fuel injection pump is reciprocated by known means not shown here. It is made to rotate at the same time. A T-shaped pressure relief passage 11 extending through the pump plunger 10 extends from a pump working chamber, also not shown, which is restricted by the pump plunger 10.
Extending to the surface of the pump plunger 10, this pressure relief passage 11 is there controlled by an injection quantity adjusting member constituted by a ring slider 12. During the reciprocating movement of the pump plunger 10, the pressure release passage 11 is controlled to be opened earlier or later depending on the position of the ring slider 12 after the pump plunger 10 has traveled a prescribed stroke, whereby the injection is interrupted. It Therefore, the amount of fuel injected is defined by the axial position of the ring slider 12.

The ring slider 12 has a start lever 13
The start lever 13 is pivotally mounted on a pump casing of a fuel injection pump, not shown here, about a shaft 14 fixed to the casing, and Pin 1
5, the ring slider 16 is engaged with the blind hole 16 for operating the ring slider 16. A tension lever 17 is rotatably supported around the same shaft 14,
An adjusting spring 18, which is embodied as a tension spring, acts on the free end of the tension lever 17, and the other end of the tension lever 17 is connected to a rotational speed adjusting lever 19. The rotation speed adjustment lever 19 has two limit stoppers 21 and 22 which can be adjusted around a shaft 20 fixed to the casing.
The rotation speed adjusting lever 19 can be rotated by the driver's operation of the accelerator pedal. A rotation speed transmitter, which is driven in synchronization with the rotation speed of the internal combustion engine, acts on the start lever 13, and this rotation speed transmitter is configured as a centrifugal speed governor 23 here. There is. In this centrifugal speed governor 23, a centrifugal weight shifts the speed governor sleeve 24 in relation to the number of revolutions. The speed governor sleeve 24 itself contacts the start lever 13, and the start lever 13 13 is shifted toward the stopper 26 of the tension lever 17 against the force of the start spring 25 supported between the tension lever 17 and the start lever 13 as the shift amount increases. The start lever 25 abuts on the stopper 26, the tension lever 17 and the start lever 13 are connected to each other, and the ring slider 12 is moved through the start lever 13 by the turning movement of the tension lever 17 in the counterclockwise direction. When viewed at, the fuel is shifted toward the right toward increasing fuel.

Before starting the internal combustion engine, the start lever 1
Under the action of the start spring 25, 3 is in contact with the governor sleeve 24 which is in the rest position. The ring slider 12 is shifted to the position for increasing the amount at the time of starting.
As soon as the internal combustion engine is started, the centrifugal weights are moved away from each other, which pushes the governor sleeve 24 to the right in the drawing. As a result, the start lever 13 is swiveled about the shaft 14, and this swiveling movement continues until it comes into contact with the stop 26 on the tension lever 17 after having traveled a predetermined swiveling distance, after which it is necessary to start. The surplus amount of is suppressed and controlled by the ring slider 12 thus shifted. This position of the centrifugal governor 23 and the ring slider 12 is shown in FIG.

The start lever 13 is acted on by an idling spring 27 which is constructed as a tension spring, and the other spring end of the idling spring 27 is hooked on a compensating lever 28. The compensation lever 28 has a shaft 29.
The shaft 29 is received by a lever arm 301 of a two-arm-shaped adjusting lever 30. The adjusting lever 30 is pivotally mounted on a shaft 31 fixed to the casing and contacts the adjustable stop 33 under the action of a stopper spring 32 by means of the other lever arm 302. The compensating lever 28, which is pivotable about an axis 29 in the adjusting lever 30, is supported by an arm 34 on an arcuate slide guide track 35, which is firmly connected to the tension lever 17. The slide guide 36 is formed into a slide guide. The sliding guide track 35 is as follows: when the tensioning lever 17 pivots in the counterclockwise direction in the drawing, the compensating lever 28.
Is shaped such that it can also be swiveled counterclockwise in the drawing by an arm 34 sliding along a slide guide track 35, so that the preload of the idling spring 27 is It is almost unchanged.

For example, the rotational speed adjusting lever 19 occupies the position shown in the drawing, and the internal combustion engine drives the centrifugal speed governor 23 at a rotational speed above the idling rotational speed, which causes the start spring 13 to rotate. Is compressed and a corresponding preload is applied to the idling spring 27, which produces a verbleibend injection quantity by keeping the ring slider 12 in the required position. As soon as the driver then depresses the accelerator pedal in order to supply the fuel, that is to say swivels the rpm adjusting lever 19 from the position shown, the ring slider 12 is moved into a position for a large injection quantity, which results in a larger injection quantity. The rotation speed of the internal combustion engine is increased. Then, at this high rpm, the tension lever 17 is shifted via the centrifugal governor 23 and the start lever 13 against the adjusting spring 18, the injection quantity is suppressed and controlled, and as a result the rpm increases further. Is prevented. As the tension lever 17 turns in the counterclockwise direction, the start lever 13 in contact with the stopper 26 of the tension lever 17 also turns in the counterclockwise direction. Via the slide guide 36, the slide guide track 35, and the arm 34,
The compensating lever 28 is likewise swung counterclockwise, so that the idling spring 27 no longer relaxes. The so-called internal connection of the idling spring 27, which prevents the idling spring 27 from loosening, avoids the known starting difficulties of the motor vehicle, especially in uphill or range driving.

The adjustment of the preload of the idling spring 27 is performed via the adjusting lever 30. In this case, the stopper 33 of the adjusting lever 30 is formed by an adjusting screw 37, and this adjusting screw 37 can be axially shifted by rotation, so that the turning position of the adjusting lever 30 determined by the stopper 33 can be changed.

In order to obtain an increased idling speed during cold start of the internal combustion engine, an adjusting means acts on the lever arm 302 of the adjusting lever 30. This adjusting means is known, for example, under the name of temperature-related or pneumatic idling rise (PLA, TLA) and is symbolically indicated in the drawing by arrow 38. The adjusting means 38 acting in relation to the temperature causes the adjusting lever 30 to oppose the force of the stopper spring 32 against a second stopper arranged on the opposite side of the lever arm 302 during cold start of the internal combustion engine. Until it turns. By means of a second stop 39, which likewise has an adjusting screw 40, the stop position of the adjusting lever 30 can be adjusted precisely in height. Adjustment lever 3 in the second stopper 39
With the contact of 0, the preload of the idling spring 27 is increased, so that the start lever 13 comes into contact with the stop 26 of the tension lever 17 only at a high idling speed. After the warm-up stage is completed, the TLA stops working and the adjusting means 3
8 releases the adjusting lever 30, which under the action of the stopper spring 32 returns to the first stopper 33 and pivots. As a result, the preload of the idling spring 27 is reduced and the desired idling speed is again automatically generated for the warm internal combustion engine.

[Brief description of drawings]

FIG. 1 is a side view showing a speed governor for a fuel injection pump of an internal combustion engine.

[Explanation of symbols]

10 pump plunger, 11 pressure release passage, 12
Ring slider (injection amount adjusting member), 13 start lever, 14 shaft, 15 pin, 16 blind hole, 1
7 tension lever, 18 adjusting spring, 19 rotation speed adjusting lever, 20 axis, 21,22 limit stopper, 23 centrifugal speed governor, 24 speed governor sleeve,
25 start lever, 26 stopper, 27 idling spring, 28 compensating lever, 29 axis,
30 adjustment lever, 31 shaft, 32 stopper spring, 33 stopper, 34 arm, 35 slide guide track, 36 slide guide, 37 adjustment screw, 3
8 arrows, 39 stoppers, 40 adjusting screws, 3
01,302 Lever arm

 ─────────────────────────────────────────────────── —————————————————————————————————————————————— Inventor Carlos Albaletz-Avilla Federal Republic of Germany Freiberg Stuttgarter Strasse 12

Claims (6)

[Claims] 1. A speed governor for a fuel injection pump of an internal combustion engine, comprising a tension lever (17) rotatable about an axis (14), the tension lever (1) being provided.
7) is adapted to be actuated by an engine speed adjusting lever (19) via an adjusting spring (18) corresponding to the desired engine speed for the internal combustion engine, which is input by the driver via the accelerator pedal, A start lever (13) is provided which is rotatable around the shaft (14) and which moves and adjusts the injection amount adjusting member (12) of the fuel injection pump. The start lever (13) is a rotation speed transmitter. , Especially by means of a centrifugal governor (23), the tension lever (1
Rotation necessary to overcome the preload of the start spring (25), which is operated in the direction of rotation opposite to that of 7) and is supported between the start lever (13) and the tension lever (17). After the number has been obtained, it is adapted to come into contact with the tension lever (17) and is further provided with an idling spring (27) acting on the start lever (13) and configured as a tension spring,
The idling spring (27) is connected to the start lever (13).
Of the type in which the spring end of the idling spring (27) remote from the start lever is adapted to be loaded in a swivel direction coinciding with the swivel direction of the tension lever (17). Acting on a compensating lever (28) which can be swung about
8) has one arm (34), the slide guide track (3) of the slide guide (36) rigidly connected with the tension lever (17).
5), and in this case the slide guide track (35) is as follows:
5) pivots the compensating lever (28) via its arm (34) during pivoting of the tensioning lever (17) and pivoting of the slide guide (36) produced thereby, whereby an idling spring. A speed governor for a fuel injection pump of an internal combustion engine, characterized in that it is shaped such that the preload of (27) is at least partially maintained. 2. A swivel axis (29) of a compensating lever (28).
Are arranged on an adjusting lever (30) which can be swung around a fixed shaft (31), and the lever position of the adjusting lever (30) is adjusted by adjusting means (32, 33, 37, 39, 4).
0) The speed governor according to claim 1, which is adjustable by means of 0). 3. The adjusting lever (30) is constructed in the shape of two arms, one lever arm (301) receives the pivot axis (29) of the compensating lever (28) and the other lever arm. Adjustable stopper (33) for (302)
3. The speed governor according to claim 2, wherein the speed governor is in force-contact with. 4. The force connection is produced by a stop spring (32) which loads the adjusting lever (30) in the swivel direction towards the stop (33).
The speed governor described. 5. The adjusting means comprises a second adjustable stop (39), which in the pivoting path of the adjusting lever (30) is as follows: adjusting lever (39). 5. The arrangement according to claim 4, wherein 30) contacts the second stopper (39) after pivoting a predetermined angle against the restoring force of the stopper spring (32).
The speed governor described. 6. A temperature-related or pneumatic idling increase (TLA, PLA) on the adjusting lever (30) for pivoting the adjusting lever (30) against the restoring force of the stopper spring (32). Means for (3)
8. The speed governor according to claim 5, wherein 8) is operating.