EP0597250A1 - Pompe d'injection de combustible - Google Patents

Pompe d'injection de combustible Download PDF

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Publication number
EP0597250A1
EP0597250A1 EP93116229A EP93116229A EP0597250A1 EP 0597250 A1 EP0597250 A1 EP 0597250A1 EP 93116229 A EP93116229 A EP 93116229A EP 93116229 A EP93116229 A EP 93116229A EP 0597250 A1 EP0597250 A1 EP 0597250A1
Authority
EP
European Patent Office
Prior art keywords
cam
fuel injection
injection pump
connecting member
annular part
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
EP93116229A
Other languages
German (de)
English (en)
Other versions
EP0597250B1 (fr
Inventor
Wolfgang Ing. Fehlmann
Gerold Dipl.-Ing. Schultheiss
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 EP0597250A1 publication Critical patent/EP0597250A1/fr
Application granted granted Critical
Publication of EP0597250B1 publication Critical patent/EP0597250B1/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
    • 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
    • F02M41/123—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 characterised by means for varying fuel delivery or injection timing
    • F02M41/128—Varying injection timing by angular adjustment of the face-cam or the rollers support
    • 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
    • F02M41/14—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 rotary distributor supporting pump pistons
    • F02M41/1405—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 rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis
    • F02M41/1411—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 rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis characterised by means for varying fuel delivery or injection timing
    • F02M41/1416—Devices specially adapted for angular adjustment of annular cam

Definitions

  • the invention is based on a fuel injection pump for internal combustion engines according to the preamble of claim 1.
  • a fuel injection pump for internal combustion engines according to the preamble of claim 1.
  • Such a fuel injection pump known from EP-A-0039304, is constructed in the manner of a distributor injection pump, in which pump pistons are provided in a rotatingly driven distributor, which are arranged radially and which are supported by roller shoes on a cam track, which essentially rests on an annular element is fixed but rotatably mounted in the pump housing, is arranged.
  • the inward-facing cams cause the pump pistons to move back and forth, alternating suction and delivery strokes, so that fuel under high pressure is supplied to one of several injection lines depending on the positions of the distributor.
  • the cam ring is rotatably arranged to adjust the time at which a respective high-pressure delivery stroke of the pump piston begins.
  • it has a radially screwed-in connecting element, which has a ball head at the outer end and engages with this in an actuating piston of a spray adjuster.
  • the control piston is adjusted by a hydraulic control fluid against the force of a return spring and thus changes the rotational position of the cam ring and thus the start of high-pressure delivery of the pump piston or the start of injection of the fuel injection.
  • the connecting element is thus screwed into a threaded bore arranged in a radially lying cam ring.
  • a threaded bore arranged in a radially lying cam ring.
  • Such a bore is of great disadvantage in the case of a very heavily loaded part such as the cam ring, which on the one hand has to be hardened in order to have the necessary wear resistance during operation and on the other hand is notch sensitive due to this hardness.
  • the fuel injection pump according to the invention with the characterizing features of claim 1 has the advantage over that the molded connecting member enables a much better introduction of force to the actuating force to be applied to the cam ring and this also applies to the holding force in a specific setting of the cam ring against the twisting forces, that occur due to the running of the rollers on the cams during the delivery stroke of the pump pistons. Furthermore, the connecting member can now be attached to the inside of the cam ring regardless of the position of the cams, since the cam ring wall thickness is no longer influenced, as is the case in the prior art. There is also a simplification for the assembly of the cam ring in connection with the actuator, since the connecting member, which is relatively small, does not have to be screwed in separately during assembly.
  • the connecting member can also be roller-shaped with an axis lying parallel to the axis of the cam ring, which has the advantage that a larger force transmission cross section is available at the point of transition of the connecting part to the cam ring.
  • FIG. 1 shows a first embodiment with an axial plan view of the annular part, the cam ring in a first embodiment
  • FIG. 2 shows a section perpendicular to the plane of the illustration in FIG. 1 as a plan view of the adjusting part of the cam ring
  • FIG. 3 shows a second exemplary embodiment with a modified one Connecting link.
  • FIG. 1 shows a cam drive of a fuel injection pump of the distributor pump type in a partial section through the injection pump, which serves to generate the movement of pump pistons of the fuel injection pump, which is not shown in any more detail.
  • This injection pump is constructed in the manner of a distributor radial piston pump, of which the section through a distributor 1 is shown in FIG. 1.
  • This is driven in rotation by a drive shaft, not shown, and has radial bores 2, which lead to pump pistons 3 as pump cylinders.
  • a roller tappet 5 is guided in a bore 4 with a larger diameter, which adjoins the bores 2 radially outwards, with a roller 6 which runs on a cam track 7 of a cam ring 8 when the distributor 1 rotates.
  • the pump pistons limit a pump work space, not shown, which adjoins the axis of the distributor and which leads via an axial pressure bore 9 to the distributor point (not shown) of the distributor, at which, depending on the rotational position of the distributor lers one of several outgoing injection lines distributed around the circumference of the distributor. These supply the corresponding injection valves.
  • four pump pistons are provided in the distributor in a uniformly distributed manner, which together convey to the pressure bore 9.
  • Corresponding cams 11 facing inwards are provided on the cam track 4.
  • the cam track is on a ring with the main square cross section. While it is sufficient to demand the fuel and to drive the pump pistons that the cam ring is stationary, whereby it is guided in a corresponding cylindrical receptacle of the pump housing (not shown further), it is rotated by adjusting the start of delivery of the pump pistons. Depending on the rotational position of the cam ring, a pressure stroke of the pump pistons will take place sooner or later, thus changing the possible start of fuel injection.
  • the cam ring By rotating the cam ring, the cam ring now has, according to the invention, a connecting member 12 on its outer circumference, which has the shape of a roller which is fitted in one piece onto the cylindrical outer surface of the cam ring. Because of the one-piece design, the connecting member 12 is cylindrical only over part of its outer circumference.
  • This roller-shaped connecting member engages in a recess 14 in an adjusting member 16 of an adjusting device 17 for adjusting the cam ring.
  • These are the hydraulic injection adjusters which are common in distributor fuel injection pumps and consist of a piston, said adjusting member 16, which is arranged displaceably in a cylinder 18 , a return spring 19 acting on its one end face and a hydraulic actuating pressure 20 acting on its other side, which is constantly supplied via a feed line 21 from a pressure source 22 (not shown).
  • the piston 60 is displaced more or less against the force of the return spring 19 and thus adjusts the rotational position of the cam ring and thus the start of injection.
  • this adjustment device also has the task of holding the cam ring in the position once set. Against the restoring forces that are caused due to the running of the rollers 6 on the cam 11 during the pressure stroke of the pump piston.
  • FIG. 2 shows the top view of a partial section along the line 11/11 of FIG. 1.
  • the section goes through the axis of the roller-shaped connecting member and shows that the longitudinal extension of the latter is spherical in the outer contour. Misalignments between actuator 16 and cam ring can thus be compensated for.
  • a bearing part 24 is inserted into the recess, which comprises the connecting member over an area which is greater than 1800.
  • the adjusting member can move easily and there is an optimal transmission of force from the actuator to the cam ring.
  • the connecting member 12 is provided with a roller-shaped surface only on the sides of its longitudinal extension parallel to the axis of the cam ring, which surface point in the direction of the adjusting movement of the adjusting member 16.
  • the connecting member 12 is in direct contact with the recess 14 adjusting member 16.
  • the connecting member can of course also be machined and have a spherical head-like end with which it engages in a correspondingly shaped recess analogous to the recess 14 in the adjusting member.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP93116229A 1992-11-06 1993-10-07 Pompe d'injection de combustible Expired - Lifetime EP0597250B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4237471A DE4237471A1 (de) 1992-11-06 1992-11-06 Kraftstoffeinspritzpumpe
DE4237471 1992-11-06

Publications (2)

Publication Number Publication Date
EP0597250A1 true EP0597250A1 (fr) 1994-05-18
EP0597250B1 EP0597250B1 (fr) 1997-01-15

Family

ID=6472242

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93116229A Expired - Lifetime EP0597250B1 (fr) 1992-11-06 1993-10-07 Pompe d'injection de combustible

Country Status (4)

Country Link
US (1) US5406923A (fr)
EP (1) EP0597250B1 (fr)
JP (1) JPH06200852A (fr)
DE (2) DE4237471A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2291136A (en) * 1994-07-12 1996-01-17 Lucas Ind Plc Cam ring-advance mechanism linkage
EP0831229A1 (fr) * 1996-09-18 1998-03-25 Lucas Industries Public Limited Company Dispositif de réglage du début d'injection

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7347984B2 (en) * 2004-04-05 2008-03-25 Jackson State University Mammalian agmatinase inhibitory substance

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1143675B (de) * 1961-04-01 1963-02-14 Bosch Gmbh Robert Verstelleinrichtung fuer den Spritzbeginn bei Einspritzpumpen
DE1263397B (de) * 1966-12-06 1968-03-14 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer Brennkraftmaschinen
DE1805276A1 (de) * 1968-10-25 1970-05-14 Noginskij Zd Toplivnoj Apparat Einspritzpumpe fuer Brennkraftmaschinen
DE2839014A1 (de) * 1978-09-07 1980-03-20 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1555482A (en) * 1975-07-05 1979-11-14 Lucas Industries Ltd Fuel injection pumping apparatus
JPS5412035A (en) * 1977-06-30 1979-01-29 Diesel Kiki Co Ltd Distirbution type fuel injection pump
DE3001166A1 (de) * 1980-01-15 1981-07-23 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzanlage
US4393846A (en) * 1980-02-15 1983-07-19 Lucas Industries Limited Fuel pumping apparatus
GB2118255B (en) * 1982-04-13 1985-10-30 Lucas Ind Plc Fuel pumping apparatus
US4448774A (en) * 1982-12-22 1984-05-15 Fisons Corporation Steroid formulation
JPS59162325A (ja) * 1983-03-07 1984-09-13 Suzuki Motor Co Ltd 燃料噴射装置
US4644924A (en) * 1984-10-09 1987-02-24 Stanadyne, Inc. Fuel injection pump with spill control mechanism
US4552117A (en) * 1984-10-09 1985-11-12 Stanadyne, Inc. Fuel injection pump with spill control mechanism
US5059096A (en) * 1990-12-26 1991-10-22 Lucas Industries Public Limited Company Fuel pumping apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1143675B (de) * 1961-04-01 1963-02-14 Bosch Gmbh Robert Verstelleinrichtung fuer den Spritzbeginn bei Einspritzpumpen
DE1263397B (de) * 1966-12-06 1968-03-14 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer Brennkraftmaschinen
DE1805276A1 (de) * 1968-10-25 1970-05-14 Noginskij Zd Toplivnoj Apparat Einspritzpumpe fuer Brennkraftmaschinen
DE2839014A1 (de) * 1978-09-07 1980-03-20 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2291136A (en) * 1994-07-12 1996-01-17 Lucas Ind Plc Cam ring-advance mechanism linkage
EP0831229A1 (fr) * 1996-09-18 1998-03-25 Lucas Industries Public Limited Company Dispositif de réglage du début d'injection

Also Published As

Publication number Publication date
DE59305139D1 (de) 1997-02-27
JPH06200852A (ja) 1994-07-19
DE4237471A1 (de) 1994-05-11
EP0597250B1 (fr) 1997-01-15
US5406923A (en) 1995-04-18

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