DE1526500A1 - Fuel injection pump for internal combustion engines - Google Patents

Description

B 87 261 Ia / »6b2 R. 8139

Robert Boech GmbH, Stuttgart, December 12, 1967

Fuel injection pump for internal combustion engines

The invention relates to a fuel injection pump for internal combustion engines, in particular with a distributor whose fuel delivery at least when the maximum threat number is reached by means of a reciprocating and rotatable, a relief channel of the pump working area controlling the adjustable slide bar is interrupted, which in one direction (outward) by the one displaced auxiliary pump working synchronously with the injection pump Fuel is driven and thereby depending on the rotational position the relief channel after covering a certain path with his partially inclined control edge (normal operation) or but it always keeps closed (Start Mehrmenga) and the one in the other Direction (return) is moved by elastic restoring means, the Rsgelschleber at least a part of the fuel quantity, which caused his exit, press through a Regeldrossol must and is braked, so that with a certain Throttle cross-section and reaching a certain speed of the control slide as a result of the occurrence of the so-called liquid stop no longer returns to its original position.

In the known fuel injection pumps described above Type of construction (see German patent specification 1 155 9 * 1 and Austrian patent specification 227 480) it is necessary to adjust the full load quantity to the amount that can be burned smoke-free at each speed (approximation) exclusively on the high pressure side, e.g. by means of adjusting valves, to carry out, the desired full-load characteristic (quantity curve in mm ^ / stroke depending on the speed) is often difficult to achieve Achieve "With these pumps, each throttle position has a certain speed that is regulated (variable-speed regulator characteristics). This is disadvantageous, for example, in vehicle operation. Also are

9 0 9851 / 072Λ ~ ■ "

BATHROOM . ^ üc ü. uenagen (Art. 7 S1 Abe. 2 No. 1 Sate 3 of the amendment ^ M. ν. 4,9ί f9 (ß |

to achieve the desired degree of non-uniformity in the various speed ranges (e.g. maximum speed or idle speed) additional funds are required «

The invention is based on the problem of "an injection pump develop in which the disadvantages mentioned do not exist and in which a control only for idling speed and maximum speed number is possible *

This object is achieved according to the invention in that the Hegel slide is rotated in a manner known per se by means of a gown as a function of the engine speed and that, with increasing threat, the starting excess quantity is first terminated and an adjustment is then generated.

It is known from another fuel injection pump (see German patent specification 1 086 9 ^ 7), a control slide - which is driven by an auxiliary pump synchronously with the injection pump for its exit and by means of an elastic return means for its fall and which is driven at least at its ßing & ng Reaching the maximum speed after having covered a certain distance, controls a relief channel, whereby this wagon can be changed when the control sole plate is turned due to its inclined control edge. in this fuel injection pump, however, the displaced fluid from the auxiliary pump w Drosselquer- by a cut-pressed and driven by the control slide don before and behind the throttle cross-section prevailing pressure difference. The Gesohwindigkeitsverlauf of Regolschieberhingangs here so ^auo * depending on the shape of the auxiliary pump piston driving cam. Since the auxiliary pump piston is advantageously designed mostly as a step of the injection piston, the cam shape is adapted to the desired course of injection and, as a result, the speed course of the shelf valve hangers is uneven, which is a

vn instability of the regulation result. In contrast, the ·% occurs. Entrance of the Ragel slide according to the invention in forced operation with the

S Auxiliary pump, the control £ ^Οθ1η Γ during the fall of the control valve

"*" *. ilUSSt.

** According to a structural embodiment "of the invention, the hydraulic pressure acts on a cylinder that is slidably guided

ORJGi _NAL

ν Robert Bosch GmbH ^ η.-Hr. 8139

Stuttgart April 28, 1966 Su / Ke

Adjusting slide against the force of a first spring, which gives way when the hydraulic pressure exceeds the value Hull (Stlllstanc ^ of the engine) up to a first limit value, which corresponds to the idling speed of the engine (end of the starting sweep), also against the force at least one second spring which yields when the hydraulic pressure exceeds a second limit value, which is preferably adjustable and is above the first limit value.

Thus, the Fördenaengenvörstellung the injection pump in the partial load range of the engine is not "it using the control throttle is performed, engages m a further embodiment of the invention on the actuating slide has a third spring, whose voltage 1st willldirlich adjustable designed so that it responds before the second spring, and the speed is controlled in this range by turning the control slide.

Two exemplary embodiments of the subject matter of the invention are shown in the drawing and are described in more detail below.

Fig. 1 shows schematically and in axial section the first embodiment.

Fig. 2 shows on an enlarged scale the development of the control edge of the control sole in the example according to Flg. 1. Fig. 3 shows a diagram about the influence of the position of the Drehst Control slide valve to 4 the delivery rate of the pump.

Flg. 4 shows a diagram which shows the pressure of the feed pump as a function of the speed.
Fig. 5 shows a detail of the first example. 6 to 11 show the detail shown in FIG. 5 in its most important working positions.

Fig. 12 shows a diagram of the function of the first example. Fig. 13 shows the second embodiment.

Flg. 14 to 16 are diagrams showing the operation of the second example. . "-

909851/0724

BATH

Robert Bosch GmbH R.-Hr. 8 ^ 9

, Stuttgart 'April 28, 1966 Su / Ke

A cylinder 2 of the injection pump and a cylinder 3 of an auxiliary pump which works synchronously with the injection pump are arranged in a housing 1 of a fuel injection pump. The two cylinders and 3 are coaxial and arranged one behind the other. A stepped piston slides in these cylinders, part K of which serves as an injection pump piston, while its cable 5, which has a larger diameter than part 4, serves as a piston of the Iillfspumpe. These pistons are driven (indicated by the arrows in Pig. L) by means of a coat, not shown, for example a cam, that they perform a reciprocating movement and a rotating movement around their axis at the same time, which corresponds to the Piston k allows you to take on the role of a distributor at the same time.

Furthermore, the housing l © in Saugrauin 6 is provided in detail, through it © ine feed pump 7 ßilt fuel is supplied, the pressure of which is from the speed of the motor is dependent on the injection pump being driven by dow will.

The suction chamber 6 is connected to the pusapsnarbaitsraura of the cylinder 2 via inen suction ducts 8, an annular groove 9 and a duct 10, both in the piston k. The opening point of the bore 8 in the cylinder 2 is arranged so that it is closed during the VerärSngungshubs de3 piston k . Furthermore, a Vsrteilerlängsnut 11 is arranged on the surface of the piston k , which cooperates with a number of pressure lines 12, which are arranged uniformly around the axis of the cylinder 2, of which, however, only one is shown. Each of these pressure lines & n leads the fuel displaced by the injection pump to an injection nozzle. During each pressure stroke of the piston k- , one of the pressure lines 12 is connected to the putapsn working space of the cylinder 2.

A control slide 13 controls a Entlaatu ^ sakanal 14, which vor.i Futapanarbeltsrauin the cylinder 2 su of a cylinder 15 leads the RegQlschiobsr aufnircnio and practice: .- a channel 16 salt the piss 6 connected 1st. An annular groove 17 is made on the Öara KegGlschiebür 12

909851/0 ^ 24

BATH ORIGINAL - 5 - "

Robert Bosch GmbH C Π .-! Α? - 0139

Stuttgart · ■ '28 .4 »1966 Su / Ifo

which is in constant * · connection with the relief channel 14 and is delimited by a Stsuorkanto 18, dis connected with the channel 16. The section © 13a and 13b of the conical slide 13, which the annular groove 1? limit, are sealing in the. Cylinder 15. ^ A return spring 1-9 tries to keep the regulating oil slide in the position shown in FIG. 1, which is bestitarat by a collar 13c of the regulating slide, which is supported on the housing of the injection pump. In this position, the section 13b, which is delimited by the control edge 18, covers an opening 39 through which the channel 16 opens into the cylinder 15.

The auxiliary pumps 3 * 5 serve to operate the control slide 13 hydraulically to move against the force of the return spring 19, uia in a certain position through the section 13b of the control slide to expose the opening 39 of the channel 16 and thus the relief channel 14 slit deta Saiigrauia 6 to join, thereby promoting the injection pump "to the ftlotor is interrupted *

The auxiliary pump 3 »5 is supplied with fuel via a suction channel 20 when the piston 5 has reached its bottom dead center and the opening of the suction channel 20 opens.

During each Verdriisigungshubs de 3 piston 5 this delivers fuel essentially via a channel 21 rait a check valve 22 in the cylinder 15 "*? O by the way of the control slide he follows.

In the delta section between two successive displacement strokes of the piston 5, the control slide 13 is pushed back into its starting position by the return spring 19. Here, fuel is discharged from the cylinder 15 via a wide channel 23, which also connects the cylinder 15 to the cylinder 3 and in which a throttle 2k is arranged, the free cross-section of which is adjustable by a throttle needle 25. The narrowing of the channel 23 by the ReßelösOSsel 24 causes a slowing down of the back

9851/0724

BATH ORIGINAL Robert Bosch GmbH 4> R. No. 8139 Stuttgart April 28, 1966 Su / Ke

Movement of the control slide valve β Ij5, which has the result that the control sole carries out a control above a certain engine speed. which is known under the designation "liquid stop ¹ *. Above this specific speed, the control slide I3 no longer has the time to reach its starting position, pushed by the return spring I9, before the liquid displaced by the piston 5 starts anew." This shortening of the return has the consequence that the necessary stroke of the control lever is shortened, after which opening 39 of the channel 16 is opened by the control edge 18 individual pressure lines 12 reduced amount of fuel delivered.

The control slide 1? leads, however, not only from a reciprocating movement in the cylinder 15, but can also about its axis are rotated, the control edge 18 of the control slide is inclined and designed (Fig, 1 and 2) that depending on the rotary position of the control slide either no connection between the cylinder 2 and the suction chamber 6 can occur (starting excess quantity) or a sol ohe takes place with different positions of the control sole plate (normal operation with adjustment) ·.

According to the invention, the control slide Ij? through appropriate Means twisted depending on the engine speed. These means could for example consist of a centrifugal regulator, but are in this example hydraulically controlled by the pressure, the the feed pump 7 developed.

In order to prevent this speed-dependent pressure from rising too quickly, a pressure regulating device can be provided. These; The device consists of a channel 26 leading from the pressure line 27 the feed pump 7 branches off and in which a throttle point 28 is arranged, the free copper section of which is controlled by a piston 29 on which the fluid pressure acts in the opening direction, and in the opposite direction a spring 350. Thanks to this

Robert Bosch GmbH X R. No. 8I39 , Stuttgart,. April 28, 1966 Su / Ke

As shown in FIG. 4, the pressure regulation procedure changes in Channel 27 the pressure ρ as a function of the engine speed n »

The channel 27 leads on the one hand into the suction chamber 6, on the other hand in a cylinder 31 * in which an adjusting slide 32 is slidably mounted is "which is connected to the control slide 13 by a transmission mechanism that rotates the axial movement of the slide 32" movement of the control slide 13 implements. This transfer mechanism * » Now there is also a pin 33 with a coaxial with the Control slide 13 arranged cap 34 is firmly connected, and the protrudes into a groove 35 made in the Stoll slide 32. The cap 34 * is for the transmission of the rotary movement through a pin 36 with the Control slide 13 connected, the inner bottom of the cap 34 serves to support the return spring 19. For better understanding, the adjusting slide 32 is shown in FIG te lines). The pin 33 and the groove 35 are shown in FIGS. 5-11 and 13 also included.

Against the force of the liquid which reaches the cylinder 31 via section 27b of the pressure line 27, a first spring 37 acts on the adjusting slide 32 (see FIGS. 5 to 11 and 13) which yields when the pressure reaches the value Zero, as it prevails when the engine is at a standstill, up to a first limit value which corresponds to the speed that the engine has in idle (termination of the starting excess quantity) and at least one second spring 38 that yields / when the hydraulic pressure exceeds a second limit which is ^: adjustable and is above the first above-mentioned Orenzwert.

In order to enable the Rege Isohiebe r 13 to generate the starting excess quantity, as in Flg. 2 shows a straight control edge 18a intended. The Uberdeokungs distance the straight control edge l8a the opening 39 is at least as large as the largest possible Hub a des Rege smile be rs 13 ,. when this his starting position

■ "bad ORIGINAL

Robert Bosch GmbH . fl R.ΛΑ

. Stuttgart ■■ April 28, 1966 Su / Ke

in which its collar 13c is in contact with the housing 1, and if its rotational position also corresponds to the lowest pressure in the cylinder 31 · Xn Fig. 2 shows the development of the control, slide section 13b with its control edge 18, 18a, 18b The angle of rotation tA under which the control slide is rotated was selected as the abscissa, and the path 1 that the control slide covers in the axial direction as the ordinate. In FIG. 2, however, the control slide is stationary and the opening 39 shows individual positions that are important in relation to the control edge. The position 39 * is assumed when the engine is started. In this case, the opening 39 cannot be uncovered, and all of the fuel displaced by the piston 4 thus reaches the injection nozzles of the engine through the pressure lines 12.

In order to turn the control slide, in addition to the automatic adjuster, which works as a function of the engine speed, a manual adjustment device is also provided in order to switch off the engine. Vie in Flg. 1, a socket 41 is placed on the cap 34, which can be rotated by the driver via an axis 42 and which is coupled to the cap 34 via a pin 43 which is firmly connected to the socket 41 and has a projection 44 on the cap 34 cooperates. In order to turn off the motor, a straight control edge 18b is provided, which lies opposite the straight control edge 18a and which is designed in such a way that it always covers at least part of the opening 39 when, with the help of the driver, through the axis 42 into the position shown in FIG. 2 is brought to the position designated 39b. Man. achieves here that the entire amount delivered by the pump flows into the channel l6, and thus the supply of the motor is interrupted.

As already stated, the liquid stop, the occurrence of which is determined by the free cross section of the control throttle 24, occurs in each case at the maximum speed of the pump. In the first example shown in FIGS. 5 to 11, the liquid stop occurs only at the maximum speed of the pump. In the second example according to FIG. 13, the liquid stop also occurs at other speeds. 909851 / ÖT24

BATH ORIGINAL

Robert Bosch GmbH 9 R.-No * 8139

Stuttgart April 28, 1966

In the first example, the regulating throttle 24 is permanently set in such a way that the control slide is braked in its return only at the maximum speed of the pump. Furthermore is the A third spring 45 is assigned to springs 37 (starting) and 38 (reference), which is also able to act on the adjusting slide 32 and the force of which can be changed by the driver, this control spring 45 being designed so that it is in front of the Angleloh spring 3 & gives way. . · · ,,.

As shown in FIG. 5, there is a plunger 46 in the cylinder 31. ]

slidably mounted, the bolt 47 of which through the central hole kst \

an equiaxed feather roller layer48 is pushed. - '

The spring abutment 48 is operated with the aid of the operating lever 49 ^; /;

pushed with engagement of gear 50 with rack 51 · '

The regulating spring 45 is arranged between the spring abutment 48 and a washer 52, through the central bore of which the bolt 47 also passes. The adjustment spring 38 is arranged between this ί disk 52 and the plunger 46. On the bolt 47 there is a stop in the form of a spring ring 53, which prevents the disk 52 from being displaced beyond a certain position by the spring 38. The spring abutment 48 is lifted by a stop 54 As can be seen from Fig. 6, the j control spring 45 has a certain maximum play b with respect to the disk 52, if it is assumed that this control spring with its other end adheres to the spring abutment 48 Adjusting slide 32 and the plunger 46 prevail as long as the spring 37 is relaxed, there is also a certain play c. Between the plunger 46 and the.; Disc 52, if it is supported on the stop 53, there is a certain play d. The spring abutment 48 has an annular middle piece 48a into which the spring ring 53 can dip so that the disc 5S can be supported directly on the annular center 1st lick 48a ' Bolt 47 screwed! Feed 55 limited. · ·. (Fig. 5). ..f ''. . _Ίΐ ; ..- '. ;.:. ■■. ·

. '. 90985i / .öti4 · ·.;. ^; : ■; - · .. '·.

15266C0

Robert Bosch GmbH 1ϋ R.-Kr, 8139

Stuttgart ■ *. April 28, 1966 Su / Ke

The example shown in Fig. 5 to U works as follows: In this case, the liquid stop only occurs when the Motor exceeds a certain speed. This specific speed is fixed for every motor, based on this. The basis is the free one Cross-section of the throttle element 24, which is decisive for the occurrence of the liquid stop, determined for a specific engine; due to the possibility of adjustability of this cross-section however, one pump type can be adapted to different motor types

The inclined control edge 18 of the control slide has an incline and a length "made in such a way" that depending on their position opposite the opening 39 Any amount between idle and full load can be reached. Only as long as »as the decisive factor for full load Part of the control edge 18 cooperates with the opening 39, takes place Alignment takes place.

In this example, the speed control is used with the exception of the Maximum engine speed by turning the control slide around its Axis reached, this rotation under the above-mentioned effects on the one hand of the pressure of the feed pump and dependent on the rotation counter on the other hand, one or more rear springs connected in series takes place. In this speed range there is still a section without Speed control available. This is described below.

When the engine is at a standstill, the individual elements take those shown in FIG. 6 position shown. The tension spring 37 holds the adjusting slide 32 in its extreme left position such that the opening 39 the In Flg. 2 position shown assumes 39a. The spring abutment 48 is held at stop 54.

If the driver starts the engine, this speed is sufficient the pressure ρ is not sufficient to increase the force of the starting multiple-quantity spring 37 Overcome. The opening 39 remains closed, and that to the engine The amount of fuel carried remains maximum. This maximum is as Qa In Flg. 3, whose diagram shows the flow rate Q as a function of the adjustment angle ^ ^ dj & RdebisjBbJ.ebers 13, and also in

'BAD'ORIGINAL *

•No. 8139 Stuttgart P * April 28, 1966 Su / Ke

Robert Bosch GmbH II R. no. 8139

F ^m 28.4.1Q66!

Fig. 12 shows the delivery rate versus the engine speed. .

When the engine is running, the pressure ρ increases with the speed a value «which overcomes the force of the starting excess quantity spring« and ■ the elements assume the idle position (Fig. 7). The game b and then it is used up and the slide valve 32 rests on the tappet 46, which in turn rests on it through the springs 38 and 45 Position is determined «with these springs over the spring abutment Support 48 at stop 54. The opening 39 takes the in Fig. shown position 39c, in which the control slide 13 only one, has to cover a short distance "before opening opening 39 * The idle quantity Qb is obtained, as can be seen from the diagrams in Flg. 3 and Flg. 12 is sufficient. '.

. If the driver actuates the operating lever 49 and thus the spring, abutment 48 moves «so it tensions the spring 45 (spring 38 behaves like a rigid element). If one assumes «that the lever .49 was actuated «to a corresponding amount for a partial load for a low speed to direct ux , εο pushes the driver

the Federwiaerlager

β £ βχηψρ5 48 in the in Flg. 8 position shown. This enlarging the tension of the control spring 45 has the consequence that the setting switch 32 against the pressure of the liquid 'which his left side acts on' suggests "is postponed" that in this mqjnent the Speed is relatively low. This movement to the left of the Adjustment slide 32 has the consequence that the control slide 13 rotates is and "so well;" that the position of the control edge 18 to the opening 39 (shown in FIG. 2 as 39d) a quantity of sensation regulates the only part of the fuel shortage is «that can be promoted at an OulMraxiüSl. The position of the slide 32 corresponds to a bet Correct engine speed "which corresponds to a corresponding fuel pressure" speaks «which acts on the left side of the adjusting slide. if If this speed leaves the value desired by the driver, the pressure change of the fuel resulting therefrom pushes the setting slide 32 against the control spring 45. the disk 52 not yet abuts the annular white piece 48a. The movement of the Stell ·?

BAD OR1G5NAL - Ί2 -

A R. No. % ftj9

8466

Robert Bosch GMBH . ft9

»Stuttgart April 28, 1966 Su / Ke

Slide 32 to the right causes the injected amount reducing rotation of the Regelsohiebers 13 and that under. stand so long «until the amount necessary for idling is reached is. The sloping lines m in Fig. 12 denote this regulation » which is not caused by the liquid attack »but through the control edge 18 of the control slide I3.

above a certain speed, denoted in FIG. 12 as nl the fuel pressure acting on the adjusting slide 32 is sufficient large to compress the control spring 45 so far that the Disk 52 is supported on the annular middle piece 48a. In this situation the control spring 45 is firmly clamped. If the spring abutment 48 is pushed as far to the left as possible, this follows Adjusting slide 32 in a position in which the opening 39 in relation on the control edge 18 assumes a full load position, in Flg. 2 as 39e designated. In this case, the amount injected is denoted by Qe, as can be seen from FIGS. It is also possible that at the moment in which the control spring 45 is clamped, the Spring abutment 48 in a position corresponding to part load (see Flg. 8) is located. In this case, in Fig. 12, the injected amount is indicated by various points Qd corresponding to the respective correspond to the position of the spring abutment 48 determined by the driver. In any case, when the speed nl is reached, the control spring 45 is clamped and the adjustment control range ends.

If the speed nl is now exceeded, only the short path of the adjustment spring 38 can be covered. This remaining path, which the adjusting slide 32 covers to the right \, can, from the position shown in Fig. 9 into the position shown in Fig.10 The position shown is equal to game d (Fig. 6).

In the wing. 12 1st this short remaining path through the easy sloping lines q and in Flg. 9 and 10 shown in its starting and end positions.

909851/0724

- 13 -

8AD

Robert Bosoh GmbH / $ R.-No, 8139

Stuttgart. April 28, 1966

In any case, apart from this slightly decreasing correction of the quantity, no regulation takes place above the speed nl up to the moment in which the liquid stop sets in which exceed a the maximum permissible speed of the motor prevented. The effect of the liquid stop is shown in Fig. 12 by the line r.

To terminate the injection - shown in FIG. 11 - pushes the driver puts the spring abutment 48 in the position that it is when starting (Fig-. 6) held. At the same time he turns the axis by hand. 42 (Fig. 1), in order to thereby move the adjusting slide 32 and the plunger 46 as far as possible to the right against the action of the spring 37, so that the opening 39 assumes the position 39b in FIG. ..

ν ■. *

The adjusting slide 32 can also then the in Flg. 11 shown Assume position when the motor increases in speed, although the spring abutment 48 is in the starting position, as is the case, for example, Vehicle going downhill occurs. In this case the pushes. increasing pressure ρ (FIG. 4) of the feed pump 7 (FIG. 1) pushes the adjusting slide 32 against the force of the spring 37 up to the position shown in FIG. 11 shown position in which no more injection takes place ..

According to the second embodiment according to Flg. 13 is the free one., Cross section of the control throttle 24, through which the speed at which. the liquid stop occurs, is determined (FIg * 1), by the ^ Driver adjustable with the aid of a handle 49a. The adjustment spring 38 also regulates the maximum delivery rate of the injection pump in here Depending on the engine speed. . , ·. ;

'TT' ■ ■ ■

For this purpose, an adjusting slide 32a, corresponding to the adjusting slide 32 of the previous example, carries a bolt 57 "on which a disk 61 is slidably arranged", the path of which is limited by a spring ring 63. 1st. The adjustment spring 38 is between the. The actuating sole above 32a and the disk 62 are arranged, a stop 58 being provided for the disk 62 which does not obstruct the path of the bolt 57. .. "'

^l' .bAd, oriQ! Näl

1626500

Robert Bosch GmbH Jf ". R. No. 8139

Stuttgart. 28. * 1966

This in FIg. 13 works as follows: The control of the respective motor speed corresponding to a control throttle position takes place over the entire speed range by the occurrence of the liquid stop. All free, adjustable by the driver Cross sections of the Rege.ldrossel 24 result in different speeds of the. Engine * The entire amount of fuel delivered by piston 4 is thus injected until the liquid stop occurs.

The inclined control edge 18 of the control slide only corrects in Dependence on the speed with its section »which serves to adjust the maximum injected during each delivery stroke Amount · Their effect is relatively small and corresponds to the inclination of the line in the Flg. 14 and IiS the amount injected

Q indicates, namely between the speed n2, at which the starting excess quantity is ended and the adjustment spring 38 begins to push together, and the speed n3, at which de «. Adjusting slide 32a on disk 62 and this abuts against stop 58. In the diagrams of FIGS. 14 and 16 (as in FIG. 12) the quantity Q (ordinate) is plotted against the engine speed η (abscissa). It can be seen that, depending on the engine type, the delivery rate can be increased with the speed ( Fig. 16) or lower with it (Fig. 14). Flg. 15 corresponds to the same pump as Flg. 16 with the difference that in FIG. 15 the angle of rotation CL of the control slide 13 is plotted on the abscissa. In the Flg. 14 and 16, the occurrence of the liquid attack is indicated by the sloping lines s.

It should also be noted that in Flg. 13 * in which the disc 62 is supported on the stop 58, the adjusting slide 32a is shown in the position it assumes when the generation of the starting meal beraita has ended. Vöi * End of the start amount and especially in the position that corresponds to the stop of the engine, there is a play c between the disk 62 and the stop 58, as in Flg. 6 shown · - V ^- V "'■' ■ [■. ^:; ■"".; ^: .

9Q985

Claims (1)

"Stuttgart." ': Expectations It is a fuel injection pump for internal combustion engines, especially with a distributor whose fuel delivery is interrupted at least when the maximum speed is reached by means of a back and forth as well as a rotary control valve which controls a relief channel of the pump work space, which is interrupted in one direction (outward) by the τοη one synchronously driven with the injection pump operating auxiliary pump fuel displaced and thereby Depending Naeh rotational position of the Entlastungsksnal after covering (of a particular Veges with its partially oblique control edge aufsteuert (Hormalbetrieb) or always closed holds (starting quantity) and the through in the other direction (back) elastic restoring means is moved «whereby the control slide at least one rope of the amount of fuel _t that caused its entry» has to be pressed through a control throttle and is braked «so that at a certain drop a certain cross-section is reached and a certain one is reached Speed of the control slide no longer in his due to the occurrence of the so-called liquid stop. Starting position runs back, characterized in that «the control slide (13) is rotated in a manner known per se by means of gaskets (31 to 36) as a function of the hotord speed and that, with increasing speed, the starting excess quantity is first ended and then an« equalization is created « 2 fuel injection pump according to claim 1, characterized in that that this smock (91 to 36) work with hydraulic pressure that changes with the speed and preferably by a die Injection pump with fuel supply pump (7) is generated will· 90 9851/072 4 _ammmu . Robert Bosch GmbH ήί R. no. 8139 Stuttgart, April 28, 1966 Su / Ke 3. Fuel injection pump according to claim 2, characterized in that that the hydraulic pressure on an adjusting slide (32) slidably guided in a cylinder (31) against the force of a first Spring (37) acts "which gives way" when the hydraulic pressure exceeds the value zero (standstill of the engine) up to a first limit value, which corresponds to the idling speed of the engine (termination of the starting excess quantity) and against the force at least one second spring (38) which gives way when the hydraulic pressure exceeds a second limit value, which is preferably adjustable and is above the first limit value 4, fuel injection pump according to claim 3 »characterized in that that a third spring (45) engages the adjusting slide (32), whose tension is arbitrarily adjustable so that it responds in front of the second spring (38), and the control of the speed in this range by turning the control slide (13) · '. ·' he follows. . · -. 5. Fuel injection pump according to one of the preceding claims, characterized in that the control slide (13) can additionally be rotated by hand in a known manner via a device (41, 42) into a position in which the relief channel (14) is open . JL - 4T-- blank page