EP0203374A1 - Pompe d'injection de combustibles pour moteurs à combustion interne - Google Patents

Pompe d'injection de combustibles pour moteurs à combustion interne Download PDF

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Publication number
EP0203374A1
EP0203374A1 EP86105622A EP86105622A EP0203374A1 EP 0203374 A1 EP0203374 A1 EP 0203374A1 EP 86105622 A EP86105622 A EP 86105622A EP 86105622 A EP86105622 A EP 86105622A EP 0203374 A1 EP0203374 A1 EP 0203374A1
Authority
EP
European Patent Office
Prior art keywords
coupling piece
drive shaft
groove
fuel injection
injection pump
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.)
Granted
Application number
EP86105622A
Other languages
German (de)
English (en)
Other versions
EP0203374B1 (fr
Inventor
Wilfried Ing. Böhringer (grad.)
Franz Eheim
Wolfgang Fehlmann
Werner Dipl.-Ing. Pape
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0203374A1 publication Critical patent/EP0203374A1/fr
Application granted granted Critical
Publication of EP0203374B1 publication Critical patent/EP0203374B1/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
    • F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
    • F02M39/02—Arrangements of fuel-injection apparatus to facilitate the driving of pumps; Arrangements of fuel-injection pumps; Pump drives
    • 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
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
    • F02M41/10—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor
    • F02M41/12—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor
    • F02M41/121—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor with piston arranged axially to driving shaft

Definitions

  • the invention relates to a fuel injection pump for internal combustion engines according to the preamble of the main claim.
  • a cross disk serves as a driving link between the drive shaft and the lifting cam disk, in the recesses on the one hand two claws of the lifting cam disk and on the other hand rotated by 90 °, two claws of the drive shaft engage. Without losing the rotational connection, the lifting cam disk can carry out the required axial movements with the pump piston, the cross disk being at least partially carried along (floating) depending on the effect of the friction.
  • the described coupling of the known injection pump has the disadvantage that for the transmission of the rotary movement from the drive shaft to the cross disk and from this to the lifting cam disk in the direction of rotation on the claws of the drive shaft, on the associated sides of the cross disk and on the claws of the lifting cam disk, flat surfaces are provided opposite, which on the one hand largely perpendicular to the direction of rotation vector and on the other hand largely radial and in the stroke direction. As the surfaces move continuously towards one another in the stroke direction, this has the consequence that the rotation transmission takes place via the edges delimiting the surfaces in the stroke direction, whereby, albeit to a small extent, tilting of the surfaces over the edges is unavoidable.
  • the fuel injection pump according to the invention with the characterizing features of the main claim has the advantage that even at high pressures and high torque between the drive shaft and pump piston, no change in the assignment takes place.
  • the driving web or the groove extends over the entire diameter of the cross coupling piece, which leads to a considerable improvement in the leverage effect and also to an increase in the areas touching during the transmission of the torque.
  • connection between the cross coupling piece and the lifting cam disk is designed as a groove / web plug connection, which permits an axial relative displacement.
  • the cross coupling piece is then expediently designed such that a groove is provided on one side and a web is provided on the other side, the pieces delimiting the groove extending transversely to the ends of the web due to the 90 ° offset usual with cross disks, thereby making an extremely stable , highly secure construction is achieved.
  • the groove on the side facing the lifting cam disc can be arranged on the cross coupling piece, into which a web on the lifting cam disc then engages, so that an additional stiffening of this lifting cam disc is achieved as a result of its continuous web.
  • the cross coupling piece is axially tied via a collar.
  • This collar lies approximately in the radial division plane and can thus be easily axially fixed between a roller ring carrying the rollers and a ring surrounding the end section of the drive shaft, for example a ring gear ring.
  • elevations serving as supports are arranged on the end faces of the web or the pieces of the cross coupling piece enclosing the groove. These elevations are supported on the one hand on an assigned surface of the lifting cam disk or the drive shaft, so that a non-positive connection from the return spring acting on the pump piston takes place via the lifting cam disk, the above-mentioned elevations, the cross coupling piece and again these elevations on the drive shaft.
  • FIG. 1 shows a partial longitudinal section through a fuel injection pump according to the invention
  • FIGS. 2 to 4 show three different views, namely from above, from the side and from below of the cross coupling piece according to the invention.
  • a pump piston 2 which is guided in a distributor head 3, is set in a reciprocating and simultaneously rotating movement by a cam drive 1.
  • fuel is conveyed from a suction chamber 4 via a suction line 5 and distributor openings 6 into a pump working chamber 7, which then during the pressure stroke via bores 8 running in the pump piston, a distributor groove 9 and via pressure channels 10 (not shown) is promoted to the internal combustion engine.
  • This delivery is interrupted by a control slide 11 as soon as a radial bore 12 of the pump piston emerges from the control slide 11 during the pressure stroke and the remaining fuel flows back into the suction chamber 4 from the pump working chamber 7.
  • the position of the control slide 11, which is adjustable by a controller, not shown, thus determines the injection quantity.
  • the injection pump is driven via a drive shaft 14, which is likewise mounted in the housing 15, in which the distributor head 3 and the cam drive 1 are also arranged.
  • the drive shaft 14 has a groove 16 into which a driving web 17 of a cross coupling piece 18 engages.
  • the width of the groove 16 corresponds to the width of the driving web 17, so that there is as little play as possible in the radial direction of the drive shaft 14 in this plug connection.
  • a groove 20 is provided, into which a driving web 21 of a lifting cam disk 22 engages.
  • the widths of the groove 20 and the driving link g s 21 correspond.
  • the pump piston 2 is connected in a rotationally locking manner to the lifting cam disk 22 via a pin 23 and is non-positively pressed onto the lifting cam disk 22 by springs, which are not shown, which are supported on the distributor head, via a spring plate 24 and an axial bearing 25, which thereby do not engage positively with the raceway 26 shown rollers of a roller ring 27 is held, which can be rotated about its axis through a certain angle by means of a spray adjusting device 28 (not explained in more detail).
  • a ring gear ring 29 Arranged around the end section of the drive shaft 14 is a ring gear ring 29, which is also connected to the drive shaft 14 in a rotationally locking manner, the ring gear 30 of which drives a speed controller of the injection pump, which is not shown in detail.
  • This ring gear ring 29 comprises radially the groove 16 and the driving web 17. Between the ring gear ring 29 and the roller ring 27, the collar 19 of the cross coupling piece 18 is axially fixed.
  • the cam drive 1 operates as follows: If the drive shaft 14 is driven at a motor-synchronous speed, the driving web 17 and thus the cross coupling piece 18 are rotated through the groove 16. Through the groove 20 of the cross coupling piece and the driving web 21 of the lifting cam disc 22, the latter is also rotated, the cam surface 26 running on the rollers of the roller ring 27 and thereby performing a reciprocating movement in the axial direction. Due to the plug connection between the groove 20 and the carrier web 21 and due to the guidance of the cross coupling piece 18 by the collar 19 between the roller ring 27 and the ring gear ring 29, the carrier web 21 moves in accordance with the reciprocating stroke movement of the pump piston 2 in the groove 20, while the cross coupling piece 18 remains axially fixed.
  • an elevation 32 is provided on the lower end face of the driving web 17, which elevation is processed accordingly.
  • elevations 35 are also provided on the upper end faces 34, which cooperate with a bearing surface 36 of the lifting cam disk 22.
  • the cross coupling piece 18 is shown in the same order from below, from the side and from above.
  • the driving web 17 is at right angles to the groove 20 and thus to the pieces 33 which delimit the groove 20.
  • there is an optimal accumulation of material in the connection area which is continued outwards by the collar 19, while avoiding thin spots that are prone to breakage.
  • the dimensions of the elevations 32 and 34 in relation to the web 17 and the pieces 33 can be seen in FIGS.
  • the groove 20 also has a circular widening in the central region, which is easy to manufacture in terms of drilling technology and can be used for ventilation or radial guidance, the latter if a corresponding bulge is provided on the driving web 21 of the lifting cam disk 22.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP86105622A 1985-05-31 1986-04-23 Pompe d'injection de combustibles pour moteurs à combustion interne Expired - Lifetime EP0203374B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8515957U 1985-05-31
DE8515957U DE8515957U1 (de) 1985-05-31 1985-05-31 Kraftstoffeinspritzpumpe für Brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP0203374A1 true EP0203374A1 (fr) 1986-12-03
EP0203374B1 EP0203374B1 (fr) 1990-01-31

Family

ID=6781648

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86105622A Expired - Lifetime EP0203374B1 (fr) 1985-05-31 1986-04-23 Pompe d'injection de combustibles pour moteurs à combustion interne

Country Status (3)

Country Link
EP (1) EP0203374B1 (fr)
JP (1) JPS61277866A (fr)
DE (2) DE8515957U1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2488769A (en) * 1945-02-06 1949-11-22 Continental Motors Corp Engine accessory drive coupling
GB903402A (en) * 1960-01-18 1962-08-15 Borg Warner Fuel injection pump
FR2286289A1 (fr) * 1974-09-25 1976-04-23 Bosch Gmbh Robert Pompe d'injection de carburant pour moteurs a combustion interne

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2488769A (en) * 1945-02-06 1949-11-22 Continental Motors Corp Engine accessory drive coupling
GB903402A (en) * 1960-01-18 1962-08-15 Borg Warner Fuel injection pump
FR2286289A1 (fr) * 1974-09-25 1976-04-23 Bosch Gmbh Robert Pompe d'injection de carburant pour moteurs a combustion interne

Also Published As

Publication number Publication date
JPS61277866A (ja) 1986-12-08
DE3668667D1 (de) 1990-03-08
DE8515957U1 (de) 1986-09-25
EP0203374B1 (fr) 1990-01-31

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