EP0626515B1 - Moyeu de synchronisation de pompe - Google Patents

Moyeu de synchronisation de pompe Download PDF

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Publication number
EP0626515B1
EP0626515B1 EP19940103721 EP94103721A EP0626515B1 EP 0626515 B1 EP0626515 B1 EP 0626515B1 EP 19940103721 EP19940103721 EP 19940103721 EP 94103721 A EP94103721 A EP 94103721A EP 0626515 B1 EP0626515 B1 EP 0626515B1
Authority
EP
European Patent Office
Prior art keywords
hub
pump
setting
supporting part
recess
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19940103721
Other languages
German (de)
English (en)
Other versions
EP0626515A1 (fr
Inventor
Hakan Fransson
Per-Ola Post
Karl-Erik Karlsson
Henrik Eriksson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Scania CV AB
Original Assignee
Scania CV AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Scania CV AB filed Critical Scania CV AB
Publication of EP0626515A1 publication Critical patent/EP0626515A1/fr
Application granted granted Critical
Publication of EP0626515B1 publication Critical patent/EP0626515B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/48—Assembling; Disassembling; Replacing

Definitions

  • the present invention relates to a pump synchronization hub of a type specified in the preamble to claim 1.
  • the injector for each cylinder of the engine typically includes a cam actuated pump element, a pressure line leading to the cylinder, an injector and an injector.
  • the pump elements for the individual cylinders are mostly assembled into a common pump unit or an injection pump. This injection pump is driven at half the crankshaft speed.
  • the power transmission from the crankshaft to the drive shaft of the injection pump can take place, for example, by a chain drive or a gearwheel drive.
  • a gear drive is used for this power transmission, it usually includes a crankshaft gear which drives the gear (pump gear) attached to the pump drive shaft via a gear arranged between these two gears.
  • the pump gear on the pump drive shaft is usually mounted on a so-called synchronizing hub, which is fixedly arranged on the pump drive shaft.
  • the pump drive shaft is also provided with a shaft journal section which is tapered towards the free end of the shaft, on which the synchronizing hub provided with a correspondingly tapered shaft bore is arranged and axially clamped by a nut on the threaded extreme end of the pump drive shaft.
  • the fuel injection pump is mounted on the engine, this must be done in such a way that the pump and engine speeds are synchronized so that the fuel injection into the cylinders takes place at exactly the right time.
  • a type of adjustment arrangement is required which allows a certain position adjustment (positioning) of the pump gear or the synchronizing hub in relation to the pump housing, so that when the pump is attached to the motor and the power transmission gears are connected to one another, the pump camshaft is synchronized with the engine crankshaft can be.
  • the synchronizing hub on the pump drive shaft is provided with a radial recess in its disc-shaped part.
  • This recess is covered by a sheet metal plate, which can be attached to the disc-shaped part of the hub in different positions and is provided with a hole through which a positioning pin can be inserted and further inserted into a hole in a stationary part of the adjacent pump housing for the hub to determine a certain rotational position in relation to the pump housing.
  • This known design solution has, among other things, the disadvantages that the relatively large recess in the hub causes a considerable weakening of the hub and that the sheet metal plate, which is made of thin sheet metal, offers poor axial guidance for the positioning pin, which entails that the pin can be slanted or tilted in the hole and therefore no longer ensures the desired exact positioning of the hub in relation to the pump housing.
  • Another disadvantage of this known solution is that the construction is relatively large Takes up space.
  • a pump synchronization hub with the features of the preamble of claim 1 is known.
  • the recess in the hub is lenticular and extends to the outer edge of the carrier part.
  • the adjusting member is arranged at a distance from the inner boundary wall of the recess; there is no outer boundary wall.
  • a screw running through an elongated hole in the adjusting member holds the latter in position by clamping between the screw head and the base of the recess.
  • the purpose of the present invention is first hand to obtain a pump synchronization hub which does not have the disadvantages mentioned above.
  • the construction should be such that the hub is not significantly weakened by the recess and that at the same time a full alignment of the positioning member can be ensured, without the construction taking up space.
  • the hub and the associated parts should be easy and inexpensive to manufacture.
  • the annular (preferably disc-shaped) support part of the hub there should be an arcuate recess which is provided for receiving an adjusting member to be installed in this recess.
  • the adjusting element which can be an adjusting plate or adjusting nut, for example, is in relation to the recess designed and dimensioned so that it can be attached to the hub in various positions in the longitudinal direction of the recess.
  • there should be a through hole in the setting member which can accommodate a positioning member which is preferably designed as a positioning pin, the hub being able to be adjusted in a specific desired position in relation to the injection pump housing by inserting the positioning member.
  • the hub itself is conventionally attached to the pump drive shaft with a suitable type of shaft connection.
  • a feather key or disc spring is expediently arranged between these parts.
  • the axial securing of the hub on the pump drive shaft is expediently carried out by a conventional nut which is screwed onto the threaded outer end of the pump drive shaft and can be tightened against the hub.
  • the arcuate recess in the carrier part of the hub, in which the adjusting member is installed allows the adjusting member to be moved (in the form of an arc) within the recess within certain limits. As a result, the setting member can be set and secured in different positions relative to the hub.
  • the easiest way to secure is with a fastening screw that is guided through the adjusting element and screwed into the hub.
  • the adjusting member In the radial direction of the hub, i.e. transverse to the longitudinal direction of the recess, the adjusting member is secured in that it bears against the boundary wall of the recess.
  • the hub When assembling the fuel injection pump, the hub is first installed on the pump drive shaft. Thereafter, the positioning member is inserted into the through hole of the adjusting member and then inserted with the free end into a further hole which may be present in a cover belonging to the pump housing or in another part which is stationary relative to the pump housing.
  • the entire positioning hub and also the pump drive shaft are rotated to a predetermined position.
  • the adjustment member is secured to the hub.
  • the injection pump is set to a predetermined position, which can be found again later by a positioning element, for example a positioning pin, being reinserted into the through hole in the setting element and inserted into the corresponding hole in the pump housing.
  • the pump If the pump is set for the above specified position by securing the adjusting element in the hub, it can be transported to the place where the pump is attached to the motor.
  • the predefined position of the pump can be found easily using a positioning pin.
  • the gearwheel provided for driving the pump drive shaft is then attached to the synchronizing hub and fastened to it using a suitable number of fastening screws. Between these fastening screws that can be screwed into the hub and the corresponding through holes in the pump gear, there should be a certain amount of play that allows a certain final adjustment of the rotational position of the gear on the hub, so that the position of the gear teeth can be taken into account accordingly.
  • the positioning pin can then be removed.
  • the gear is mounted in a position that results in synchronization with the crankshaft of the vehicle engine. With a pump synchronization hub of the type described above, the pump can thus be mounted in a synchronized position in relation to the crankshaft of the engine.
  • the arcuate recess in the carrier part of the hub is expediently located at a radial distance within the outer edge of the annular carrier part.
  • the cutout can partly comprise a through opening in the carrier part and partly a groove adjoining this in the side of the carrier part facing away from the pump housing.
  • the adjusting member expediently consists of an adjusting plate which partly comprises a sleeve-shaped area which can be received in the through opening and partly a disk-shaped carrier part which projects out in this area and which can be received in the channel.
  • the axial through hole in the sleeve-shaped area of the adjusting plate is then expediently used as the hole for receiving the positioning pin.
  • the disk-shaped area of the adjusting plate then expediently has an arcuate through opening for receiving a screw that can be screwed into the bottom of the channel, with which the adjusting plate can be secured in the arcuate recess in the desired setting position.
  • the arcuate recess consists of a passage provided with a shoulder and axially arranged in the carrier part.
  • an arc-shaped adjusting nut serves as the adjusting element, which can be received by a part of the opening provided with the shoulder, which is located on the side of the carrier part facing the pump housing, and is radially wider.
  • the opening provided with the shoulder is dimensioned such that the shaft of the screw which can be screwed into the adjusting nut extends freely through a radially narrower part of the opening provided with the shoulder.
  • a hexagon socket screw is expediently used as the fastening screw, the head of which can be tightened against the side of the ring-shaped carrier part of the hub facing away from the pump housing.
  • the arcuate adjusting nut takes on different positions relative to the hub in the opening provided with the shoulder can, the nut can be tightened with the help of the mentioned hexagon socket screw.
  • the arc-shaped nut is secured in the radial direction of the hub in that it bears against the boundary wall of the opening provided with the shoulder.
  • the positioning pin which can be inserted through a central axial through hole in the hexagon socket screw, can nevertheless be the Allen key for tightening the hexagon socket screw in this case.
  • the synchronizing hub is first attached to the hub when the pump is assembled. Then the positioning element designed as a positioning pin / Allen key is inserted through the hole in the head of the Allen screw and further into another hole that is stationary relative to the pump housing. The entire hub and the pump drive shaft are then rotated to a predetermined position. When in this position, the adjusting nut is fastened to the hub by tightening the hexagon socket screw. In this way, the pump has been set in a predetermined position, which can later be easily found again, by reinserting a positioning pin through the hole in the Allen screw and inserting it into the corresponding hole in the pump housing.
  • the positioning element designed as a positioning pin / Allen key
  • the procedure is basically the same the above description of the first embodiment, in which the arcuate recess consists of a through opening and a groove connected to this in the annular support part of the hub and serves as an adjusting member, a correspondingly designed adjusting plate.
  • the ring-shaped carrier part of the hub expediently has a number of threaded holes for receiving a corresponding number of fastening screws with which the pump gear can be screwed onto the carrier part of the synchronizing hub.
  • the pump gear is screwed onto the side of the carrier part of the hub facing away from the pump housing.
  • FIGS. 5, 6 and 12 show a first embodiment of a pump synchronization hub 2 according to the invention, which is provided for attachment to the drive shaft 4 of a fuel injection pump 6 (see FIGS. 5, 6 and 12).
  • This synchronizing hub comprises an annular, disc-shaped carrier part 8, which serves as a fastening part for a pump gear 10, which drives the pump 6.
  • the pump gear 10 receives its drive from the crankshaft of an internal combustion engine via an intermediate gear, which both with a crankshaft gear and the pump gear 10 is engaged.
  • an arcuate recess 12 is provided for receiving an adjusting member 14 which can be installed therein and in this case consists of an adjusting plate 16 of the type shown in FIGS. 4a, 4b and 4c.
  • This adjustment member 14 or this adjustment plate 16 can be secured relative to the hub 2 in different positions in the longitudinal direction of the recess 12.
  • the adjusting plate 16 has a through hole 18 for receiving a positioning member, which is preferably designed as a positioning pin 22 and is used to adjust the hub 2 in a desired position relative to the housing 24 of the injection pump 6.
  • the arcuate recess 12 is located at a radial distance within the outer edge 26 of the annular carrier part 8.
  • the recess 12 partly comprises a through opening 28 in the carrier part and partly one adjoining groove 30 in the side 52 of the carrier part 8 facing away from the pump housing.
  • the adjustment plate 16 provided for receiving in the arcuate recess 12 partly comprises a sleeve-shaped region 32 which can be received in the through opening 28 and partly an arc-shaped disc-shaped carrier part 34 which projects out of this region 32 that can be received in the channel 30.
  • the sleeve-shaped area 32 of the adjusting plate has an axial through hole 18 which serves as a hole for receiving a positioning pin, which can be of the type shown in FIG. 7 and is designated there by 22 .
  • a positioning pin which can be of the type shown in FIG. 7 and is designated there by 22 .
  • the disk-shaped carrier part 34 of the adjusting plate 16 there is an arcuate through opening 36 for receiving the shaft of a screw 42 which can be screwed into a threaded hole 40 in the bottom 38 of the groove 30 to secure the adjusting plate 16 in a desired position in the recess 12.
  • the arcuate recess is located at a radial distance within the outer edge 26 of the ring-shaped carrier part 8, but in this case the recess comprises a passage 44, provided with a shoulder and axially arranged in the carrier part 8, with a through opening 44 on the pump housing 24 Adjacent side 48 of the carrier part 8, radially wider part 46 and a radially narrower part 50 on the side 52 of the carrier part 8 facing away from the pump housing the paragraph provided opening 44 can be received.
  • a locking screw 56 screwed into the adjusting nut 54 and having a central, axial through-hole 58, which serves to receive the positioning pin designated by 60 in FIG. 11.
  • the threaded shaft 62 of the screw 56 which can be screwed into the adjusting nut 54, extends freely through the radially narrower part of the opening 44.
  • the securing screw 56 is expediently designed as an Allen screw, the head 64 of which is directed away from the pump housing Page 54 of the carrier part 8 can be tightened.
  • the annular support part 8 of the hub has a number, in this case five threaded holes 66 for receiving a corresponding number of fastening screws 68 (see FIGS. 5 and 12 ) with which the pump gear 10 driven by the crankshaft of the engine can be screwed to the carrier part 8 of the hub on the side of the hub facing away from the pump housing 24.
  • the pump housing 24 (or in one part firmly connected therewith) an insertion hole 70 for receiving one end of the positioning pin 22 or 60, which through the through hole 18 or 58 in the according to the execution.
  • Fig. 1 and Fig. 4a, 4b and 4c as an adjustment plate 16 and according to the execution. 10, 11 and 12 can be introduced as adjusting nut 54 adjusting member 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (9)

  1. Moyeu de synchronisation de pompe (2, 2'), destiné à être attaché à l'arbre d'entrée (4) d'une pompe d'injection de carburant (6),
    - ledit moyeu (2, 2') ayant une partie porteuse annulaire (8) pour le montage d'une roue dentée (10) pour l'entraînement de la pompe,
    - ledit moyeu (2, 2') comprenant, dans la partie porteuse (8), un évidement (12) destiné à recevoir un organe de réglage (14) sous la forme d'une plaque de réglage (16) ou d'un écrou de réglage (54),
    - ledit organe de réglage (14) pouvant être attaché selon la direction longitudinale de l'évidement (12) dans des positions différentes par rapport au moyeu (2, 2'), et
    - ledit organe de réglage (14) étant muni d'un trou traversant (18; 58) destiné à recevoir un organe de positionnement, tel qu'une broche de positionnement (22; 60), pour le réglage du moyeu (2, 2') dans une position désirée par rapport au boîtier de la pompe d'injection (24),
    ledit moyeu étant caractérisé en ce que
    - ledit évidement (12) a la forme d'un arc et est disposé à une distance radiale et à l'intérieur du bord extérieur (26) de la partie porteuse annulaire (8), et en ce que
    - l'organe de réglage (14) est bloqué dans la direction radiale par le fait qu'il s'appuie contre une paroi de limitation de l'évidement (12).
  2. Moyeu de synchronisation de pompe selon la revendication 1,
    caractérisé en ce que ledit évidement (12) réalisé dans la partie porteuse (8) comprend une ouverture traversante (28; 44), en ce qu'une portion (32) de l'organe de réglage (14) peut être reçue dans ladite ouverture traversante (28; 44), et en ce que l'organe de positionnement est guidé dans ledit trou traversant (18; 58) de l'organe de réglage (14), au moins le long de cette portion, dans une direction axiale.
  3. Moyeu de synchronisation de pompe selon la revendication 2,
    caractérisé en ce que ledit évidement (12) en forme d'arc comprend ladite ouverture traversante (28) et une rainure (30) adjacente dans le côté (52) de la partie porteuse (8) qui est opposé au boîtier de la pompe, et en ce que ledit organe de réglage (14) consiste en une plaque de réglage (16) comportant une portion (32) en forme de douille qui peut être reçue dans ladite ouverture traversante (28), et un segment porteur (34), en disque, arqué, faisant saillie par rapport à ladite portion, ce segment pouvant être reçu dans ladite rainure (30).
  4. Moyeu de synchronisation de pompe selon la revendication 3,
    caractérisé en ce que la portion (32) en forme de douille de la plaque de réglage comprend un trou traversant axial (18) qui sert de trou de logement pour l'organe de positionnement, réalisé de préférence comme broche (22), et en ce que, en vue de bloquer la plaque de réglage (16) dans une position de réglage désirée dans l'évidement arqué (12), le segment porteur (34) en disque de la plaque de réglage (16) comporte une ouverture traversante arquée (36) destinée à recevoir la tige d'une vis (42) se vissant dans le fond (38) de la rainure (30).
  5. Moyeu de synchronisation de pompe selon la revendication 2,
    caractérisé en ce que ladite ouverture traversante (44) est munie d'un épaulement, et que ledit organe de réglage est un écrou de réglage (54) en forme d'arc qui peut être reçu dans une partie (46), d'une largeur plus grande dans la direction radiale, de l'ouverture traversante (44) munie de l'épaulement, cette partie étant disposée dans le côté (48) de la partie porteuse (8) qui fait face au boîtier de pompe (24).
  6. Moyeu de synchronisation de pompe selon la revendication 5,
    caractérisé en ce que dans l'ouverture traversante (44) munie de l'épaulement est reçue, vissée dans l'écrou de réglage (54) en forme d'arc, une vis de blocage (56) comportant un trou traversant (58) central, axial, ce trou servant à recevoir l'organe de positionnement, réalisé de préférence comme broche (60), et la tige filetée (62) de la vis (56) se vissant dans l'écrou de réglage (54) s'étendant librement à travers une section (50) radialement plus étroite de ladite ouverture traversante (44) munie de l'épaulement.
  7. Moyeu de synchronisation de pompe selon la revendication 6,
    caractérisé en ce qu'une vis à tête à six pans creux sert de vis de blocage (56), la tête (64) de la première pouvant être serrée contre le côté (52), opposé au boîtier de la pompe, de la partie porteuse annulaire du moyeu (2').
  8. Moyeu de synchronisation selon une quelconque des revendications précédentes,
    caractérisé en ce que la partie porteuse annulaire (8) du moyeu (2, 2') comprend plusieurs, par exemple cinq trous taraudés (66) destinés à recevoir un nombre correspondant de vis de fixation (68) au moyen desquelles la roue dentée (10), entraînée par un arbre de moteur, destinée à l'entraînement de la pompe, peut être fixée à vis sur la partie porteuse (8) du moyeu (2, 2') sur le côté de la partie porteuse qui est opposé au boîtier de pompe (24).
  9. Moyeu de synchronisation de pompe selon une quelconque des revendications précédentes,
    caractérisé en ce que le boîtier de pompe (24) ou un élément solidaire avec lui comprend un trou d'introduction (70) recevant l'une des extrémités de l'organe de positionnement réalisé de préférence en forme de broche (22, 60) en vue de son passage à travers le trou traversant (18, 58) formé dans l'organe de réglage (16, 54).
EP19940103721 1993-04-22 1994-03-10 Moyeu de synchronisation de pompe Expired - Lifetime EP0626515B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9301341A SE500496C2 (sv) 1993-04-22 1993-04-22 Pumpsynkroniseringsnav
SE9301341 1993-04-22

Publications (2)

Publication Number Publication Date
EP0626515A1 EP0626515A1 (fr) 1994-11-30
EP0626515B1 true EP0626515B1 (fr) 1996-12-11

Family

ID=20389664

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940103721 Expired - Lifetime EP0626515B1 (fr) 1993-04-22 1994-03-10 Moyeu de synchronisation de pompe

Country Status (4)

Country Link
EP (1) EP0626515B1 (fr)
BR (1) BR9401555A (fr)
DE (1) DE59401236D1 (fr)
SE (1) SE500496C2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2849116B1 (fr) * 2002-12-18 2005-02-11 Peugeot Citroen Automobiles Sa Moteur a combustion interne muni d'une pompe et procede de remplacement de ladite pompe

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2000997A1 (de) * 1970-01-10 1971-07-22 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer Brennkraftmaschinen
JPS54113724A (en) * 1978-02-24 1979-09-05 Nippon Denso Co Ltd Cam shaft locking device of fuel injection pump
DE2949100A1 (de) * 1979-12-06 1981-06-11 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zum festhalten einer in einer kraftstoffeinspritzpumpe fuer brennkraftmaschinen angeordneten antriebswelle

Also Published As

Publication number Publication date
SE9301341L (sv) 1994-07-04
SE500496C2 (sv) 1994-07-04
SE9301341D0 (sv) 1993-04-22
DE59401236D1 (de) 1997-01-23
BR9401555A (pt) 1994-11-01
EP0626515A1 (fr) 1994-11-30

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