EP0410149A1 - Pompe d'injection de combustible pour moteurs à combustion interne - Google Patents

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

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Publication number
EP0410149A1
EP0410149A1 EP19900112099 EP90112099A EP0410149A1 EP 0410149 A1 EP0410149 A1 EP 0410149A1 EP 19900112099 EP19900112099 EP 19900112099 EP 90112099 A EP90112099 A EP 90112099A EP 0410149 A1 EP0410149 A1 EP 0410149A1
Authority
EP
European Patent Office
Prior art keywords
valve
spring
piston
fuel injection
injection line
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.)
Withdrawn
Application number
EP19900112099
Other languages
German (de)
English (en)
Inventor
Jaroslaw Dipl.-Ing. Hlousek
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 EP0410149A1 publication Critical patent/EP0410149A1/fr
Withdrawn legal-status Critical Current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
    • F02M59/46—Valves
    • F02M59/462—Delivery valves
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped

Definitions

  • the invention now relates to such a fuel injection pump for injection internal combustion engines, in which a valve arrangement is provided between the working space of the pump piston and the injection line, which valve arrangement includes a spring-loaded check valve that opens in the direction of delivery and a spring-loaded valve that allows fuel to flow back from the injection line to the working space.
  • a valve plate of the check valve opening in the conveying direction is seated on the part containing the working space and has a central cylinder bore forming part of the valve which allows a backflow, and wherein a valve which bears around the valve arrangement on the part containing the working space screw part is provided.
  • Such training is known for example from DE-OS 24 39 374.
  • the backflow of fuel valve is formed with a valve cone, which closes the cylinder bore of the valve disk opening in the direction of conveyance and opens against the direction of conveyance.
  • a valve cone brings about an abrupt termination and an abrupt opening of the valve allowing the backflow, which again can create new pressure waves in the downstream rooms and in the injection line, which favor cavitation.
  • the object of the invention is to avoid or at least largely attenuate the formation of pressure waves, to reduce the dimensions of the valve arrangement and to simplify the design thereof.
  • the invention essentially consists in the fact that the backflow-permitting valve is formed by a piston valve which is guided in the cylinder bore of the valve plate and is acted upon by the pressure in the working chamber and which has at least one radial bore which counteracts after a predetermined stroke of the piston valve the conveying direction is released from a control edge of the cylinder bore and opens into a central blind bore of the piston slide, which is in open connection with the injection line, and wherein the piston slide is acted upon by the pressure in the injection line against the spring force and is supported against a support surface of the valve screw connection part.
  • the backflow allowing valve is formed by a spool, the radial bore grinds a control edge of the cylinder bore of the valve plate, a gentle opening and closing of the backflow connection is achieved and an abrupt effect, as is done when the valve is formed with a valve cone , avoided. Since the spool is opposed by the pressure in the injection line Spring is acted upon, this valve is opened by the pressure waves in the injection line, so that pressure surges or pressure waves in the injection line cannot build up to a dangerous extent. After completion of the valve opening in the direction of delivery, the piston slide moves under the effect of the pressure waves occurring in the injection line in the cylinder bore.
  • the injection line is first relieved of pressure. As soon as the radial bore of the piston slide grinds over the control edge of the cylinder bore, fuel can flow out of the injection line in the direction of the working area of the pump piston and the injection line is relieved of constant pressure. At this stage, the flow connection via the radial bore of the spool and the control edge of the cylinder bore is throttled depending on the stroke of the spool. According to the invention, the relief of the injection line thus takes place in two stages and represents a combination of equal space relief and equal pressure relief.
  • the valve arrangement has only a single coil spring which is supported on the one hand against the piston slide and on the other hand against the valve plate of the check valve opening in the conveying direction and therefore loads both the piston slide and the spring plate.
  • the valve disk of the valve opening in the conveying direction is supported against the valve screw connection part by a coil spring, while the valve cone of the valve allowing a backflow is supported against the valve disk of the valve allowing a backflow by a second coil spring.
  • a coil spring is thus saved in the configuration according to the invention.
  • valve plate, piston slide, spring and optionally an adjusting washer as an independent unit which can be used between the part having the working space of the pump piston and the valve screw connection part.
  • a unit has the essential advantage that it can be precisely adjusted outside the injection pump and the spring tension and thus the opening pressure outside the injection pump can be adjusted on a corresponding test bench.
  • This unit preset on the test bench, can be replaced without the need for adjustment in the installed state.
  • a safety device in particular formed by a spring ring, is provided to prevent the piston from being pulled out of the cylinder bore.
  • the structural unit containing the valve plate, the piston slide, the valve spring and possibly the shim is held together in an adjusted state as an independent structural unit, which can be replaced as required.
  • a unit can have very small dimensions.
  • the valve screw part and / or the part having the working space preferably has a, in particular cylindrical, recess for receiving this structural unit containing the valve disk, the piston valve and the valve spring.
  • the piston slide expediently has a widened hollow head part which forms a spring plate, which rests around the mouth of the injection line in the support surface of the valve screw connection part on the support surface and whose cavity has at least one lateral opening with the one in the conveying direction behind that in the conveying direction opening check valve located in connection.
  • FIG. 1 shows a longitudinal section through the part having the working space of the pump piston and the valve screw connection part and through the valve arrangement.
  • FIG. 2 is a partial cross section along line II-II of FIG. 1.
  • valve 1 is the part which has the working space 2 of the pump piston 3 and to which the valve screw part 4 is screwed by screws 5.
  • 6 is the valve assembly.
  • a piston slide 10 with element play is fitted in a central cylinder bore 9 of the check valve plate 7 opening in the conveying direction.
  • This piston slide 10 has four radial bores 11 which open into a central blind bore 12 and cooperate with a control edge 13 of the cylinder bore 9.
  • the blind bore 12 opens into a cavity 14 of an enlarged head 15 of the spool 10, which abuts a support surface 16 of the valve screw part 4.
  • the central blind bore 12 is in open connection with the injection line 17 via the cavity 14.
  • a coil spring 18 is biased, which loads both the valve plate 7 and the widened head 15.
  • the tension of this spring can be adjusted by means of a shim 19.
  • the cavity 14 of the widened head 15 is connected via four lateral bores 20 to the spring chamber 21, so that when the valve disk 7 is lifted, the fuel is conveyed from the working chamber 2 through the bore 8 into the spring chamber 21 and through the lateral bores 20 to the injection line 17 can be.
  • the actual, not shown, flexible injection line is connected to the injection line 17 formed by a bore connected by means of a standard Dutch screw connection 26.
  • the piston slide 10 is thus loaded by the pressure waves occurring in the injection line 17 and, under the action of these pressure waves, lifts up against the action of the spring 18 from the support surface 16 and plunges deeper into the cylinder bore 9 until the radial bores 11 from the control edge 13 are smoothed. This takes place after a predetermined stroke 22 of the piston valve 10 has been covered. In this phase, there is therefore equal space relief. As soon as the radial bores 11 have grinded over the control edge 13, the fuel can flow back towards the working space 2, and in this second phase the injection line 17 is depressurized. This backflow is throttled depending on the stroke of the spool 10. During these two phases, namely the equal space relief and the equal pressure relief, the check valve 23 opening in the conveying direction is closed.
  • a spring ring 24 is provided which secures the piston valve 10 against being pulled out of the cylinder bore 9.
  • the spool 10 with the valve 23 opening in the conveying direction and the spring 18 with the shim 19 are combined to form an independent structural unit which can be adjusted outside the injection pump by selecting the shim 19. Such a unit can be easily replaced at any time without further adjustment.
  • sealing surface 25 of the valve screw connection part 4 rests directly and without the interposition of a seal on the sealing surface 26 of the part 1 containing the working space 2, these surfaces are completely in their position.
  • the support surface 16 for the head 15 of the spool 10 can thus be machined very precisely in its position relative to the sealing surface 25 of the valve screw part 4, so that also adjustment is no longer required when the unit is replaced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP19900112099 1989-07-28 1990-06-26 Pompe d'injection de combustible pour moteurs à combustion interne Withdrawn EP0410149A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19893925056 DE3925056A1 (de) 1989-07-28 1989-07-28 Kraftstoffeinspritzpumpe fuer einspritzbrennkraftmaschinen
DE3925056 1989-07-28

Publications (1)

Publication Number Publication Date
EP0410149A1 true EP0410149A1 (fr) 1991-01-30

Family

ID=6386066

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900112099 Withdrawn EP0410149A1 (fr) 1989-07-28 1990-06-26 Pompe d'injection de combustible pour moteurs à combustion interne

Country Status (3)

Country Link
EP (1) EP0410149A1 (fr)
JP (1) JPH0364664A (fr)
DE (1) DE3925056A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2273134A (en) * 1992-12-01 1994-06-08 Bosch Gmbh Robert Delivery valve for a fuel injection pump.
EP0709569A1 (fr) * 1994-10-28 1996-05-01 Lucas Industries Public Limited Company Soupape de commande
CN103470417A (zh) * 2013-09-27 2013-12-25 无锡威孚高科技集团股份有限公司 等压出油阀

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2439374A1 (de) * 1973-08-22 1975-02-27 Caterpillar Tractor Co Kraftstoff-einspritzsystem
EP0325858A2 (fr) * 1988-01-16 1989-08-02 Lucas Industries Public Limited Company Soupape de commande de pression

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2439374A1 (de) * 1973-08-22 1975-02-27 Caterpillar Tractor Co Kraftstoff-einspritzsystem
EP0325858A2 (fr) * 1988-01-16 1989-08-02 Lucas Industries Public Limited Company Soupape de commande de pression

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2273134A (en) * 1992-12-01 1994-06-08 Bosch Gmbh Robert Delivery valve for a fuel injection pump.
GB2273134B (en) * 1992-12-01 1995-09-20 Bosch Gmbh Robert Delivery valve
EP0709569A1 (fr) * 1994-10-28 1996-05-01 Lucas Industries Public Limited Company Soupape de commande
US5669356A (en) * 1994-10-28 1997-09-23 Lucas Industries Control valve
CN103470417A (zh) * 2013-09-27 2013-12-25 无锡威孚高科技集团股份有限公司 等压出油阀

Also Published As

Publication number Publication date
DE3925056A1 (de) 1991-01-31
JPH0364664A (ja) 1991-03-20

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Effective date: 19910731