EP0268584B1 - Process for installing an injection pump on an internal combustion engine - Google Patents

Abstract

A process in which an obliquely-operated insertion-type pump (11) is introduced by means of an adjustment system (27) in the pump housing (23) of an internal combustion engine and which ensures a constant supply for all insertion-type pumps of an engine, without any correction being needed to the quantity of the supply. When the supply adjustment element is secured in the test position, the insertion pump introduced in the testing unit is made to rotate until the supply matches the amount required. In this rotation position a fixing pin (28), supported in the flange (24) of the insertion pump and accommodated in a recess in the testing unit, is adjusted and secured in position. With the adjustment bar (21) of the motor locked in the basic test position a fixing groove (33) designed to receive the fixing pin (28) of a setting plate (32), which can be fixed to the pump housing (23) is brought, by means of a dummy pump, into a corresponding rotary position. After removal of the dummy pump, the insertion pump is secured in the pump housing (23) of the internal combustion engine with the fixing pin (28), which is introduced into the fixing groove (33). The adjustment system (27) which consists of the fixing pin (28) on the pump flange and the fixing groove (33) in the setting plate (32) also enables re-setting in the event of errors and in the case of a repair.

Description

State of the art

The invention is based on a method according to the generic preamble of the main claim and furthermore relates to a multi-cylinder and single-cylinder internal combustion engine with plug-in pumps mounted according to the method according to the invention.

Single-cylinder plug-in fuel injection pumps, or plug-in pumps for short, are advantageously used whenever the effort for an in-line or distributor injection pump is too great for engines with low cylinder output (approx. 2 to 30 kW / cyl.), And when using short pressure lines and the associated costs achievable better injection conditions, the injection pumps should be mounted as close as possible to the injection nozzle of the associated engine cylinder. Plug-in pumps do not have their own drive, but are driven by an engine's own camshaft. The control of the injection quantity takes place via a motor-specific control rod, which, like the delivery quantity adjustment element of the plug-in pump, lies below the associated mounting flange within the pump fitting of the internal combustion engine.

Pumps of this type are known, for example, from the company Robert Bosch GmbH, Stuttgart, with the designations PF 1 Q ... and PFR 1 K ... (see e.g. the document Injection Equipment for Diesel Engines with Injection Pump PF »; VDT- UBP 001/6 from Robert Bosch GmbH, Stuttgart), and each of these pumps is set on a test bench before being attached to the internal combustion engine, using a test base, to the same delivery rate for all pumps of the same series and by means of an adjustment arrangement in the associated pump fit the internal combustion engine used and attached there. Since the adjustment arrangement provided with a fixing pin in the case of the aforementioned pumps only defines their mounting position on the pump fitting, the motor on the test bench has to be set again precisely with regard to the delivery rates of the individual plug-in pumps. In this case, adjustable coupling parts of the engine's own control rod must be coupled to the delivery rate adjustment elements of the plug-in pumps and adjusted. If a single pump is replaced, this test procedure must be carried out again.

From EP-PS 0 090 226, a method of the generic type has now become known which avoids the disadvantages shown and, after installing the plug-in pumps on the internal combustion engine, guarantees a delivery rate which is the same for all plug-in pumps of an internal combustion engine. With this method, for the first time, even with a set delivery rate guaranteed by the injection pump manufacturer, even with subsequent adjustment on the engine, equal delivery in multi-cylinder internal combustion engines is ensured on all plug-in pumps. The engine-specific control rod can be designed as a simple sheet metal stamped part with fixed counter-coupling parts for the coupling parts of the delivery rate adjustment elements of the plug-in pumps, and the internal combustion engine also no longer needs a viewing window to readjust the control rod. Also to set the required engine power, the engine no longer needs to be put on the brakes, which is particularly advantageous for an integrated drive, since e.g. B. with a fixed on the engine crankshaft unit there is no longer any possibility to adjust the engine alone in terms of its performance. The essential features of this method are that, before the installation of the plug-in pump by means of a device located on the test base, a first adjustment aid, e.g. B. a crack mark, an adjustment arrangement is attached to the mounting flange of the plug-in pump, and on the internal combustion engine by means of a dummy pump with the engine control rod blocked in the test basic position, a second adjustment aid, e.g. B. also a crack mark, the adjustment arrangement on the pump fitting of the internal combustion engine in each case in a position assigned to the basic test position of the delivery quantity adjusting member. When the plug-in pump is inserted into the pump fitting, both adjustment aids are then brought into line. The adjustment aids used in the known method and specified there, e.g. B. crack marks or pin-hole connections are immovably fixed after they are attached and can no longer be corrected. In the event of an inadvertent incorrect setting or in the event of the repair of any component, this leads to time-consuming reworking, or it is necessary to replace important components.

The invention is based on the object of improving the known method for mounting the plug-in pumps and the associated adjustment arrangement and the internal combustion engine in such a way that the method can be carried out fully automatically by robots, independently of the skill of the skilled worker assembling the plug-in pump, and with the appropriate quantities . In the event of incorrect settings or in the event of a repair, it should also be possible to attach the necessary adjustment aids as often as required without time-consuming rework.

Advantages of the invention

The specified object is achieved in an advantageous manner by the method according to the invention with the method features specified in the characterizing part of the main claim. Both the fixing pin of the adjusting bolt, which serves as the first adjusting aid and is adjustably mounted in the mounting flange, and the fixing groove, which serves as the second adjusting aid and is intended for receiving the fixing pin, in the adjustment plate provided on the flange surface of the pump fitting are fully adjustable and can be in their position after the setting be secured. When the plug-in pump is inserted into the pump fitting, the delivery rate is then actuator coupled to the engine's own control rod and the fixing pin is only inserted into the fixing groove of the adjustment plate. This assembly process is completely independent of the skill of the fitter, and in the event of incorrect settings or in the event of a repair, the necessary adjustment work can be repeated as often as required without time-consuming reworking. If, according to claim 2, the adjusting bolt carrying the fixing pin is designed as a front crank with an eccentrically attached fixing pin, the adjusting bolt can advantageously be used as an adjusting tool for rotating the injection pump, as a result of which the delivery rate setting on the insert pump is considerably simplified and less expensive. According to claim 3, the adjustment plate is inserted as a support for the mounting flange of the plug-in pump between the mounting flange and the flange surface of the pump fitting and can thus also serve as a preliminary stroke adjustment plate.

Due to the method features defined in claim 4, all pumps of the same series are supplied with the same precautionary measure from the mounting flange to the extreme drive-side limitation of the plug-in pump, and the same precautionary measure is set at the pump fitting of the internal combustion engine by selecting the adjustment plates provided with a suitable thickness dimension, so that without Special adaptation of the dimensions determining the preliminary stroke, each plug-in pump of the same series can be used in any pump fitting of the internal combustion engine. The preliminary stroke that determines the start of conveying is then reliably guaranteed without fitting and adjustment work and without the need for complex inspection work, and the adjusting plates also serve as preliminary stroke adjusting disks.

In claim 5, the features of the associated multi-cylinder internal combustion engine are defined, the engine's own control rod, as is known from the aforementioned EP-PS 0 090 226, is formed in one piece with the counter-coupling parts for the delivery rate adjustment members of the plug-in pumps arranged in series, and each with an adjustment arrangement formed by two adjustment aids for the installation of the plug-in pumps is equipped. To carry out the method according to one of claims 1 to 4, this multi-cylinder internal combustion engine is designed in accordance with the characterizing features of claim 5, and the advantages already mentioned for the method are achieved.

In an embodiment variant of the associated multi-cylinder internal combustion engine designed according to claim 6, the fixing pin forming the first adjustment aid is provided within a recess that is recessed in relation to the bearing surface of the mounting flange of the plug-in pump and is open radially outwards, and the adjusting plate has approximately the shape of a small washer, which protruding from the outside into the recess with a fixing groove forming the second adjustment aid encompassing the fixing pin on two sides and being fastened to the flange surface of the pump fitting by means of a screw. Such a small adjusting plate is cheap and easy to manufacture and does not take on any other functions, so that there are no special requirements with regard to both the thickness tolerance and the flatness of this plate, as would be necessary if the adjusting plate were also used as a forward stroke adjusting disk.

The advantages mentioned above for claim 6 can also be achieved in a single-cylinder internal combustion engine designed in accordance with claim 7 and equipped for carrying out the method according to claim 1 or 2 with the adjusting arrangement formed by the two adjusting aids.

In order to facilitate the mounting of the setting plate, the U-disk-shaped setting plate is provided with an aid for aligning the mounting position of the setting plate in addition to the fixing groove and at least one through opening for the fastening screw. and according to claim 9, this aid is formed by two recesses, preferably arranged symmetrically to the fixing groove, into which the position-securing pins of the dummy pump can then engage.

drawing

Two exemplary embodiments to illustrate the method according to the invention and the associated internal combustion engine are described in more detail below with reference to the drawing. 1 shows the first exemplary embodiment with a plug-in pump designed according to the invention and mounted on the associated internal combustion engine, and FIG. 2 shows a plan view in the direction of arrow 11 in FIG. 1; FIGS. 3 to 7 serve to explain the method and FIG. 3 shows in a simplified representation the pretension dimension UT required for the adjustment of the pre-stroke, FIG. 3a shows a section 11 la from FIG. 3 with a spring plate that can be replaced to adjust the pre-stroke, FIG Flow rate with definition of the first fixing aid in a plug-in pump used in a test base, Figure 5 shows a sketch for setting the depth dimension on the internal combustion engine corresponding to the lead dimension UT, Figure 6 shows the pump fitting on the internal combustion engine with a dummy pump used to adjust the position of the setting plate, and Figure 7 shows a plan view in the direction of arrow VII in Figure 6; FIG. 8 shows the second exemplary embodiment with an adjustment plate protruding into a recess on the fastening flange of the plug-in pump, partially cut along line VIII in FIG. 9, and FIG. 9 is a plan view in the direction of arrow IX in FIG. 8.

Description of the embodiments

Figures 1 and 2 show in longitudinal section and plan view an inclined edge controlled, in a housing 10 of the associated internal combustion engine used single-cylinder plug-in fuel injection pump 11, hereinafter referred to as plug-in pump. A pump cylinder 15 is fastened in a pump housing 12 in a known manner in the pump housing 12 with the interposition of a pressure valve 13 by means of a pipe screw connection 14. Within the pump cylinder 15, a pump piston 16 is axially and rotatably guided and carries on its outer surface an oblique control edge 17 which cooperates with a control bore 18 in the wall of the pump cylinder 15 to determine the delivery rate. A regulating sleeve forming a delivery quantity adjustment member 19 is coupled in a rotationally fixed manner to the pump piston 16, but allows its lifting movement and, as a coupling part 20 for actuation by a motor-specific control rod 21, carries a driver bolt which is fastened to a control arm and is arranged parallel to the longitudinal axis of the pump piston. The coupling part 20 engages in a slot-like counter-coupling part 22 on the engine-specific control rod 21. The engine-specific control rod 21 is designed for use in a multi-cylinder internal combustion engine in one piece with the counter-coupling parts 22 which are fixed in position in the cylinder spacing (not shown in more detail). The associated plug-in pumps 11 are then also inserted in the same cylinder spacing in a pump fitting 23 of the housing 10 of the internal combustion engine, and each pump fitting 23 is provided on the installation side with a flange surface 23a for fastening the plug-in pump 11.

The pump housing 12 of the plug-in pump 11 carries a radially projecting fastening flange 24, which in the example shown contains two through holes 25 for fastening screws 26 (see FIG. 2). The through holes 25, which can also be formed as elongated holes, are so large that a partial rotation of the pump housing 12 is possible for the basic setting of the delivery rate.

For the correct installation of the plug-in pump 11 is at the connection point between. Fastening flange 24 of the plug-in pump 11 and flange surface 23a on the housing 10 has an adjustment arrangement 27 which is formed by two adjustment aids. The first adjustment aid is a fixing pin 28 of an adjusting bolt 29, which is mounted in the mounting flange 24 so as to be rotatably adjustable and protrudes on the drive side. This adjusting bolt 29 is designed as an end crank with an eccentrically attached fixing pin 28 and, in this embodiment, can also be used as an adjusting tool for rotating the plug-in pump. An adjusting bolt with a centrally arranged fixing pin is also conceivable, which then has to be fastened in a longitudinally displaceable manner in an elongated hole of the fastening flange 24 (not shown). The installation position of the fixing pin 28 is secured by a fastening nut 30 and additionally sealed by a cap 31. Of course, the adjusting bolt 29 can also be secured against rotation by other securing means, such as caulking.

Between the mounting flange 24 of the plug-in pump 11 and the flange surface 23a on the internal combustion engine, an adjustment plate 32 is inserted, which, with a fixing groove 33 (see also FIG. 7) forming the second adjustment aid, encompasses the fixing pin 28 on both sides and, in addition to through openings 34 for the fixing screws 26 of the plug-in pump 11 and a central opening 35 for receiving the pump housing 12 also has through openings 36 for fastening the adjustment plate 32 serving screws 37. These through openings 34 and 36 in the setting plate 32 are also made so large that, like the through bores 25 in the mounting flange 24 of the plug-in pump, they permit the necessary partial rotatability of the setting plate 32, which is described further below. These through openings 34 and 36 can of course also be designed as elongated holes.

At the foot of the pump piston 16, a spring plate 38 is fastened, which in the embodiment variant according to FIG. 1 receives a pre-lifting plate 39 with the thickness dimension e, the outer end face of which forms a limit 41 on the drive side of the plug-in pump 11. A roller tappet 42, indicated by dash-dotted lines, belongs to the cam drive 43 (see also FIG. 5) of the internal combustion engine in the design of the plug-in pump 11 described, but can also be an integral part of the pump in another known design of the plug-in pumps. By selecting the thickness dimension e of the preliminary stroke plate 39, the preliminary dimension UT, which determines the preliminary stroke VH of the pump piston and is taken at bottom dead center, is set from the mounting flange 24 to the outermost limit 41 on the drive side. The preliminary stroke VH is the part of the pump piston stroke which is covered from the end face of the pump piston 16 on the pump work chamber side until the control bore 18 is closed.

FIGS. 3 to 7 serve to explain the method according to the invention for attaching the plug-in pumps 11 to an internal combustion engine and also contain the necessary devices.

FIG. 3 shows once again the protrusion dimension UT that extends from the mounting flange 24 to the drive-side limit 41 of the plug-in pump, and in FIG serves to set the projection dimension UT, and which forms the drive-side limit 41 of the plug-in pump 11 with its drive-side end face.

FIG. 4 shows the plug-in pump 11 used for adjusting the delivery rate in a test base 44. The fixing pin 28 serving as the first adjustment aid is opened by a recess 45 designed as a fixing groove and serving as a device for attaching the first fixing aid Taken, and the coupling part 20 of the delivery rate adjusting member 19 is held by a control rod 21 corresponding to the motor control rod 21 of the test base 44 in the basic test position (e.g. middle position) or in a test position deviating from this basic test position by a predetermined distance. The angular position assumed between the coupling part 20 and the fixing pin 28 is the same as the angle a shown in FIGS. 2 and 7 with the engine control rod 21 in the test basic position.

FIG. 5 shows the dimensions on the pump fitting 23 of the internal combustion engine that are required for the definition of the forward stroke on the plug-in pump. The projection dimension UT set on the plug-in pump 11 is set on the internal combustion engine as the depth dimension, but is identified in the same way. It is composed of a distance dimension X extending from the flange surface of the pump fitting 23 to a support surface 47 on the cam drive 43 and the thickness dimension c of the plug-in pump 32, which is provided in different thickness dimensions. The cam drive 43 here also includes the roller tappet 42, so that the bearing surface 47 is located on the roller tappet 42 of the cam drive 43. If a plug-in pump with an integrated roller tappet were used, the dimension UT would extend to the base circle of the associated drive cam, which then forms the contact surface 47. The lead dimension UT is then produced on the plug-in pump by changing the rollers.

6 and 7 show, among other things, a dummy pump 48 inserted into the pump fitting 23 and used to adjust the setting plate 32. The dummy pump 48 has a dummy body 49 corresponding to at least part of the pump housing 12, which is inserted into the pump fitting 23 and one The fixed coupling part 50 corresponding to the coupling part 20 of the delivery quantity adjusting element 19 carries a fixing pin 52 corresponding to the fixing pin 28 in position and size on a flange-like projection 51. The positionally fixed coupling part 50 and the fixing pin 52 are at a fixed angular distance from one another which is assigned to the basic test position of the engine-specific control rod 21 and is characterized by the angle a.

• a) vor dem Anbau der Einsteckpumpe 11 wird zur Einstellung des den Förderbeginn bestimmenden vorhubes VH ein engtoleriertes, für alle Pumpen der gleichen Serie gleiches Vorstehmass UT (siehe Figuren 1 und 3) vom Befestigungsflansch 24 bis zur äussersten antriebsseitigen Begrenzung 41 der Einsteckpumpe 11 durch Einbau oder Auswechseln eines dazu vorgesehenen, mit passender Dickenabmessung e bereitgestellten Bauteiles, z. B. des Federtellers 38' in Figur 3a oder der Vorhubplatte 39 in Figur 1, eingestellt;
• b) ebenfalls noch vor dem Einbau der Einsteckpumpe 11 wird am Pumpeneinpass 23 der Brennkraftmaschine (siehe Figur 5) das gleiche Vorstehmass UT als Tiefenmass unter Einbeziehung der Einstellplatte 32 bis zur Auflagefläche 47 am Nokkenantrieb 43 durch Auswahl der mit passender Dickenabmessung c bereitgestellten Einstellplatte 32 eingestellt;
• c) zum Einstellen der Fördermenge und der Lage der ersten Justierhilfe der Justieranordnung 27 wird die Einsteckpumpe 11 in den Prüfuntersatz 44 eingesetzt und das Kupplungsteil 20 des Fördermengenverstellgliedes 19 wird von der Stellstange 46 des Prüfuntersatzes 44 an der Prüfbank in der Prüfgrundstellung oder in einer um ein vorbestimmtes Abstandsmass von dieser Prüfgrundstellung abweichenden Prüfstellung festgehalten, der als erste Justierhilfe dienende Fixierzapfen 28 ist dabei von der Ausnehmung 45 des Prüfuntersatzes 44 aufgenommen;
• d) bei mit einer festgelegten Prüfdrehzahl angetriebener Prüfbank wird die Fördermenge der Einsteckpumpe 11 gemessen und letztere so lange verdreht, bis die Fördermenge einer Sollfördermenge entspricht, wobei als Stellwerkzeug der mit dem exzentrischen Fixierzapfen 28 versehene Ju-' stierbolzen 29 benutzt wird;
• e) die eingestellte, der Sollfördermenge zugeordnete Drehlage der Einsteckpumpe 11 wird an dieser festgehalten, indem der Justierbolzen 29 in seiner nach dem Einstellen der Fördermenge eingenommenen Lage gesichert wird, d. h. die Befestigungsmutter 30 wird angezogen und die Plombierkappe 31 eingedrückt;
• f) zur Vorbereitung des Anbaus der Einsteckpumpe am Pumpeneinpass 23 der Brennkraftmaschine (siehe Figuren 6 und 7) wird die motoreigene Regelstange 37 in die Prüfgrundstellung gebracht und in dieser Stellung blockiert, dann wird eine Pumpenattrappe 48 durch die zentrale Öffnung 35 der Einstellplatte 32 hindurch in den Pumpeneinpass 23 eingesetzt und mit seinem lagefesten Kupplungsteil 50 in das Gegenkupplungsteil 22 der Regelstange 21 eingeführt, dabei wird bei gelösten Schrauben 37 die Einstellplatte 32 in eine solche Lage gedreht, dass ihre als zweite Justierhilfe dienende Fixiernut 33 den Fixierzapfen 52 der Pumpenattrappe 48 aufnimmt; Fixierzapfen 52 und Kupplungsteil 50 stehen jetzt in dem mit dem Winkel a gekennzeichneten festgelegten Winkelabstand, der auch der Einstellung des als erste Justierhilfe dienenden Fixierzapfens 28 an der Einsteckpumpe zugrunde lag, in dieser Lage wird die Einstellplatte 32 durch Anziehen der Schrauben 37 am Pumpeneinpass 23 fixiert und danach die Pumpenattrappe 48 wieder entfernt;
• g) jetzt wird die Einsteckpumpe 11 in den Pumpeneinpass 23 eingesetzt und das Fördermengenverstellglied 19 mit der motoreigenen Regelstange 21 gekuppelt, indem das Kupplungsteil 20 in das Gegenkupplungsteil 22 eingeführt wird (siehe Figur 1), zugleich wird der Fixierzapfen 28 in Überdeckung mit der Fixiernut 33 der Einstellplatte 32 gebracht und in diese Nut eingeführt; in dieser Einbaulage wird die Einsteckpumpe 11 durch die Befestigungsschrauben 26 an der Brennkraftmaschine befestigt;
• h) ein Begrenzungsanschlag für die Regelstange 21 wird auf eine der Prüfstellung entsprechende oder zugeordnete Vollaststellung eingestellt und die Blockierung der motoreigenen Regelstange 21 wieder gelöst.

The method according to the invention for attaching the plug-in pumps 11 to the appropriately designed internal combustion engine is described below in particular with the aid of FIGS. 3 to 7 of the drawing and has the following method steps in the first exemplary embodiment:

• a) before the installation of the plug-in pump 11, a tightly tolerated, for all pumps of the same series, pre-measure dimension UT (see FIGS. 1 and 3) from the mounting flange 24 to the outermost drive-side limit 41 of the plug-in pump 11 is set by installation to set the forward stroke VH that determines the start of delivery or replacement of a component provided with a suitable thickness dimension e, e.g. B. the spring plate 38 'in Figure 3a or the Vorhubplatte 39 in Figure 1, set;
• b) likewise before the installation of the plug-in pump 11, the same projection dimension UT as the depth dimension is set on the pump fitting 23 of the internal combustion engine (see FIG. 5), including the adjustment plate 32 up to the contact surface 47 on the cam drive 43 by selection of the adjustment plate 32 provided with a suitable thickness dimension c ;
• c) for adjusting the delivery rate and the position of the first adjustment aid of the adjustment arrangement 27, the plug-in pump 11 is inserted into the test base 44 and the coupling part 20 of the delivery volume adjustment member 19 is moved from the actuating rod 46 of the test base 44 to the test bench in the basic test position or in one order predetermined distance dimension from the test position deviating from the basic test position is recorded, the fixing pin 28 serving as the first adjustment aid is received by the recess 45 of the test base 44;
• d) when the test bench is driven with a fixed test speed, the delivery rate of the plug-in pump 11 is measured and the latter is rotated until the delivery rate corresponds to a target delivery rate, the adjusting bolt provided with the eccentric fixing pin 28 being used as a locking pin 29;
• e) the set rotational position of the plug-in pump 11, which is assigned to the desired delivery quantity, is held on the latter by the adjustment bolt 29 being secured in its position assumed after the delivery quantity has been set, ie the fastening nut 30 is tightened and the sealing cap 31 pressed in;
• f) in preparation for the installation of the plug-in pump on the pump fitting 23 of the internal combustion engine (see FIGS. 6 and 7), the motor-specific control rod 37 is brought into the test basic position and blocked in this position, then a dummy pump 48 is inserted through the central opening 35 of the adjusting plate 32 the pump fitting 23 inserted and inserted with its fixed coupling part 50 into the mating coupling part 22 of the control rod 21, with the screws 37 loosened, the adjusting plate 32 is rotated into such a position that its fixing groove 33, which serves as a second adjustment aid, receives the fixing pin 52 of the dummy pump 48; Fixing spigot 52 and coupling part 50 are now at the specified angular distance marked with the angle a, which was also the basis for the setting of the fixing spigot 28 serving as the first adjustment aid on the plug-in pump. In this position, the setting plate 32 is fixed to the pump fitting 23 by tightening the screws 37 and then removed the dummy pump 48 again;
• g) now the plug-in pump 11 is inserted into the pump fitting 23 and the delivery quantity adjusting member 19 is coupled to the engine-specific control rod 21 by inserting the coupling part 20 into the counter-coupling part 22 (see FIG gur 1), at the same time the fixing pin 28 is brought into overlap with the fixing groove 33 of the adjusting plate 32 and inserted into this groove; in this installed position, the plug-in pump 11 is fastened to the internal combustion engine by the fastening screws 26;
• h) a limit stop for the control rod 21 is set to a full load position corresponding to or assigned to the test position and the blocking of the motor control rod 21 is released again.

The method described above can be largely automated, and the assembly of the plug-in pumps z. B. be carried out by robots, since no manual and skilled workers to perform alignment work is no longer necessary.

The second exemplary embodiment, shown in FIGS. 8 and 9, for carrying out an embodiment variant of the method according to the invention differs essentially only in a modified configuration of the adjusting arrangement 27A. The same parts are therefore identified by the same reference numerals, different parts by the capital letter A and new parts are provided with new reference numerals.

In a part of the mounting flange 24A of the plug-in pump 11A projecting laterally in the illustrated second exemplary embodiment, the adjusting bolt 29 is adjustably mounted and, as in the first exemplary embodiment, is provided on the end face with the fixing pin 28 which forms the first adjusting aid. This fixing pin 28 does not protrude on the drive side, as in the first exemplary embodiment, beyond a bearing surface 24a of the fastening flange 24A, but lies within a recess 55 which is set back parallel to the bearing surface 24a of the fastening flange 24A and is open radially to the outside. The adjustment plate 32A, which has approximately the shape of a small washer, projects into this recess 55. In the mounting position shown, with the fixing groove 33 forming the second adjustment aid, it comprises the fixing pin 28 on two opposite sides and is fastened to the housing 10 of the internal combustion engine by means of a screw 37 on the flange surface 23a of the pump fitting 23.

The U-disk-shaped setting plate 32A is provided with a fixing groove 33 which is open towards the plug-in pump 11A and a through opening 36 for the screw 37 which serves for fastening, and also with an aid for aligning the mounting position of the setting plate 32A. This aid is formed on two sides of the fixing groove 33, seen from the center of the pump, offset to the outside and formed in recesses 56 symmetrical to the fixing groove. These recesses 56 are used to hold position securing pins on the dummy pump, which is not shown but is constructed similarly to the dummy pump 48 in FIGS. 6 and 7. In addition to the fixing pin 52, this dummy pump therefore also carries the two position-securing pins corresponding to the recesses 56 on a radially outwardly extended part of the projection 51, so that the adjusting plate 32A in each of the test positions of the engine's control rod 21 (see FIG. 7) or a corresponding one Control member fixed mounting position is aligned radially to the longitudinal axis of the plug-in pump 11 A.

Between the flange surface 23A or, as shown, between a countersink 57 in the area of this flange surface 23a and the support surface 24a of the mounting flange 24A, a sealing washer 58 and one or more presetting adjusting washers 59 are inserted, the total thickness of which corresponding to the dimension c in FIG. 5 previously corresponding process step b was determined. The thickness of these disks 58, 59 and the adjusting plate 32A and the height of the fixing pin 28 are coordinated with one another in such a way that there is always a play denoted by d in FIG. 8 between the adjusting plate 32A and the recess 56, and also between the end face of the fixing pin 28 and the flange surface 23a.

The method carried out using the adjustment arrangement 27A described for FIGS. 8 and 9 for attaching the plug-in pump 11A to the correspondingly designed internal combustion engine deviates only slightly from the method described for the first exemplary embodiment in some method steps. Thus, in method step b, as already mentioned, the depth dimension corresponding to the projection dimension UT is set by selecting the advance stroke adjusting disk 59 provided in the required number or with a suitable thickness dimension; Steps a, c, d and e are adopted unchanged; in step f, instead of the adjusting plate 32 covering the entire flange surface, the small U-shaped adjusting plate 32A is brought into the appropriate position by means of the dummy pump and screwed down with the screw 37; the process steps g and h again do not differ.

The plug-in pumps 11 and 11 A mounted according to the above-described method variants generally no longer need to be checked for full load setting after they have been installed, and the power setting of the internal combustion engine and checking of the power are also unnecessary when using the method according to the invention, or only performed a short functional test. In multi-cylinder internal combustion engines, the otherwise very complex equalization of the individual pump elements is also eliminated and the engine-specific control rod can be formed in one piece with the mating coupling parts for the delivery rate adjustment elements of the plug-in pumps. However, the first-mentioned advantages can also be achieved with single-cylinder internal combustion engines, and even their control rod or their correspondingly designed control element (control lever) need no longer be adjusted or corrected in terms of the basic setting after installation of the plug-in pump.

The invention also extends to pump nozzles inserted into the cylinder head of an internal combustion engine, which are driven by the engine's own camshaft and controlled via an engine's own control rod, which is common to all pump nozzles, because the individual injection pumps assembled with the associated injection nozzle to form a structural unit also constitute «plug-in pumps» .

Claims (9)

1. Process for installing at least one single-cylinder plug-in fuel injection pump on an internal-combustion engine, whereby the inclined- edge-controlled plug-in pump provided with a fastening flange on the pump housing is adjusted as to its preliminary stroke which determines the delivery start before its installation and is adjusted to an associated desired delivery quantity on a test bench using a test support, the delivery quantity adjusting element being retained firmly in a predetermined basic test position (central position for example) or in a test position deviating from said basic test position by a predetermined distance dimension by rotating the plug-in pump and is afterwards inserted into a pump fitting of the internal-combustion engine by means of an adjusting arrangement and fastened there, a first adjustment accessory of the adjusting arrangement having been fitted to the fastening flange of the plug-in pump by means of an apparatus present on the test support, and a second adjustment accessory to a flange surface of the pump fitting of the internal-combustion engine by means of a pump mock-up with the engine side regulator rod locked in the basic test position before the installation of the pump and respectively in a position associated with the basic test position of the delivery quantity adjusting element, and the two adjustment accessories having also been brought into coincidence during the insertion of the plug-in pump into the pump fitting, characterized in that during the rotation of the plug-in pump required to adjust the delivery quantity before the installation of the plug-in pump (11; 11 A) a fixing pin (28) of an adjusting bolt (29) mounted adjustably in the fastening flange (24; 24A), which acts as the first adjustment accessory of the adjusting arrangement (27; 27A) is restrained firmly by means of a recess (45) in the test support (44) which receives the fixing pin (28) and after the adjustment of the delivery quantity the adjusting bolt (29) is secured in its position then assumed, also that, as the second adjustment accessory, a fixing groove (33) provided to receive the fixing pin (28) in an adjusting plate (32; 32A) attached on the flange surface (23a) of the pump fitting (23) is brought into the position associated with the basic test position of the delivery quantity adjusting element (19) by means of the pump mock-up (48) inserted into the pump fitting (23) and introduced with a fixed- position coupling part (50) into a corresponding countercoupling part (22) of the engine side regulator rod (21 ) and is fixed in said position by releasable fastening of the adjusting plate (32; 32A) to the flange surface (23a), and that finally, during the insertion of the plug-in pump into the pump fitting (23), the delivery quantity adjusting element (19) is coupled to the engine side regulator rod (21) and the fixing pin (28) is plugged into the fixing groove (33) of the adjusting plate (32; 32A).

2. Process according to Claim 1, characterized in that during the adjustment of the desired delivery quantity the adjusting bolt (29), which is constructed as an overhung crank having an eccentrically attached fixing pin (28), is used as a setting tool for the rotation of the plug-in pump.

3. Process according to Claim 1 or 2, characterized in that during the attachment of the second adjustment accessory the adjusting plate (32) which is provided with the fixing groove (33) to receive the fixing pin (28) which projects on the drive side is fastened on the flange surface (23a) of the pump fitting (23) and acts as a support for the fastening flange (24) of the plug-in pump (11).

4. Process according to Claim 3, characterized in that before the installation of the plug-in pump (11 ), in orderto adjust the preliminary stroke (VH) which determines the delivery start, on the one hand a close-fitting projection dimension (UT), the same for all the pumps of the same series, from the fastening flange (24) to the extreme drive side limit (41 ) of the plug-in pump (11) is adjusted by installing or exchanging a component (spring plate 38' or preliminary stroke plate 39, for example) provided for that purpose and prepared with a suitable thickness dimension (e), and on the other hand a depth dimension is adjusted on the pump fitting (UT) including the adjusting plate (32) as far as a support surface (47) on the cam drive (43) by selecting the adjusting plate (32) prepared with suitable thickness dimension (c).

5. Multi-cylinder internal-combustion engine, the engine side regulator rod of which is constructed integrally with the countercoupling parts fitted at cylinder interval for the delivery quantity adjustment elements of the plug-in pumps arranged in series, and which is equipped in each case with an adjusting arrangement formed by two adjustment accessories for the installation of the plug-in pumps, for performing the process according to one of Claims 1 to 4, characterized in thatthe adjusting bolt (29) is mounted adjustably in the fastening flange (24) of each plug-in pump (11) and provided at its end face with the fixing pin (28) which forms the first adjustment accessory, and that the adjusting plate (32), which is inserted between the fastening flange (24) of the plug-in pump (11) and the support surface (23a) on the pump fitting (23) of the internal-combustion engine, embraces the fixing pin (28) on two sides with the fixing groove (33) which forms the second adjustment accessory and exhibits, besides passage bores (34) forfastening screws (26) of the plug-in pump (11) and a central bore (35) to receive the pump housing (12), at least one passage bore (36) for a screw (37) to secure the position of the adjusting plate (32), the size of the passage bores (34, 36) being designed for a limited rotation of the adjusting plate (32).

6. Multi-cylinder internal-combustion engine, the engine side regulator rod of which is constructed integrally with the countercoupling parts fitted at cylinder interval for the delivery quantity adjusting elements of the plug-in pumps arranged in series, and which is equipped in each case with an adjusting arrangement formed by two adjustment accessories for the installation of the plug-in pumps, for performing the process according to Claim 1 or 2, characterized in that the adjusting bolt (29) is mounted adjustably in the fastening flange (24A) of each plug-in pump (11 A) and provided at its end face with the fixing pin (28) which forms the first adjustment accessory, that the fixing pin (28) is attached within a recess (55) set back relative to a support surface (24a) of the fastening flange (24A) and parallel to the latter and open radially outwards, and that the adjusting plate (32A) has approximately the shape of a U-washer which projects from the outside into the recess (55) with which the fixing groove (33) which forms the second adjustment accessory embraces the fixing pin (28) on two sides and is fastened on the flange surface (23a) of the pump fitting (23) by means of at least one screw (37).

7. Single-cylinder internal-combustion engine, the engine side regulator element of which is constructed integrally with the countercoupling part for the delivery quantity adjusting element of the plug-in pump, and which is equipped with an adjusting arrangement formed by two adjustment accessories for the installation of the plug-in pump, for performing the process according to Claim 1 or 2, characterized in that the adjusting bolt (29) is mounted adjustably in the fastening flange (24A) of the plug-in pump (11A) and provided at its end face with the fixing pin (28) which forms the first adjustment accessory, that the fixing pin (28) is attached within a recess (55) set back relative to a support surface (24a) of the fastening flange (24A) and parallel to the latter and open radially outwards, and that the adjusting plate (32A) has approximately the shape of a U-washer which projects from the outside into the recess (55), with which the fixing groove (33) which forms the second adjustment accessory embraces the fixing pin (28) on two sides and is fastened on the flange surface (23a) of the pump fitting (23) by means of at least one screw (37).

8. Internal-combustion engine according to Claim 6 or 7, characterized in that the adjusting plate (32A) of U-washer conformation is provided not only with the fixing groove (33) and at least one passage bore (36) for the screw (37) which serves for fastening but also with an auxiliary means for aligning the installation position of the adjusting plate (32A).

9. Internal-combustion engine according to Claim 8, characterized in that the auxiliary means for aligning the adjusting plate (32A) is formed by two recesses (56) made on both sides of the fixing groove (33), preferably symmetrically to the latter, which serve to receive position-securing pins of the pump mock-up.

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