DE102008040122A1 - Piston fuel pump for an internal combustion engine - Google Patents

Piston fuel pump for an internal combustion engine

Info

Publication number
DE102008040122A1
DE102008040122A1 DE200810040122 DE102008040122A DE102008040122A1 DE 102008040122 A1 DE102008040122 A1 DE 102008040122A1 DE 200810040122 DE200810040122 DE 200810040122 DE 102008040122 A DE102008040122 A DE 102008040122A DE 102008040122 A1 DE102008040122 A1 DE 102008040122A1
Authority
DE
Germany
Prior art keywords
drive shaft
cam
fuel pump
piston fuel
internal combustion
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Withdrawn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
DE200810040122
Other languages
German (de)
Inventor
Friedrich Boecking
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
Priority to DE200810040122 priority Critical patent/DE102008040122A1/en
Publication of DE102008040122A1 publication Critical patent/DE102008040122A1/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102Mechanical drive, e.g. tappets or cams
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/02Fuel-injection apparatus having means for reducing wear

Abstract

A piston fuel pump for an internal combustion engine comprises a housing, a plurality of cylinders arranged in series, which are formed by identical delivery modules, which are inserted into corresponding receiving openings in the housing, and a common drive shaft (24) for the delivery modules, which for each delivery module Cam portion (50a, 50b). It is proposed that the cam portion (50a, 50b) of a conveyor module comprises two oppositely disposed like cams (52) whose highest peaks are interconnected by a cam axis (54a, 54b) and that the cam axes (54a, 54b) of the cam portions (50a, 50b) about the central axis (56) of the drive shaft (24) are tilted to each other so that all the cams (52), seen in the circumferential direction of the drive shaft (24), are evenly distributed.

Description

  • State of the art
  • The The invention relates to a piston fuel pump according to the preamble of claim 1.
  • A piston fuel pump of the type mentioned above is for example from the DE 103 22 604 A1 known. This includes a housing, which may for example also be the engine block of the internal combustion engine. In the housing, a drive shaft is mounted, and the housing has a plurality of openings into which identical delivery modules can be inserted. The delivery modules form the cylinders of the piston pump, so they include a cylinder liner, a piston, etc. In order to enable the piston of a conveyor module in the necessary for the promotion reciprocation, the drive shaft has a cam portion.
  • Disclosure of the invention
  • task The present invention is to a piston fuel pump to create the fuel as evenly as possible promotes and has a long life.
  • These Task is by a piston fuel pump with the features of claim 1. Advantageous developments of Invention are specified in subclaims. About that In addition, find important features for the invention in the following description and the drawing. It can these features for the invention both in isolation as well as being important in different combinations without that This is again explicitly pointed out.
  • By the basically symmetrical arrangement of the two cams of a cam portion and seen in the circumferential direction of the drive shaft uniform Distribution of the cams of all cam sections is achieved the loads acting on the drive shaft, in particular bending moments, are relatively low, whereby the life of the invention Piston fuel pump is high. In addition, by the Arrangement of the cam a uniform flow achieved, with comparatively low pressure peaks, which also the service life of the piston fuel pump benefits.
  • A Roller between a piston of a conveyor module and the drive shaft reduces the transverse forces acting on the piston and the wear on the drive shaft. Also by this the life is improved.
  • at two cylinders, the cam axes are preferably ninety degrees tilted to each other, whereas in three cylinders, the cam axes tilted to each other by sixty degrees. As a result, the invention provided even distribution of the cams in the circumferential direction reached.
  • The Integration of the drive shaft in the internal combustion engine saves space, whereas one outside the engine Drive shaft the versatility and maintainability of Piston fuel pump improved.
  • following Be embodiments of the invention with reference explained in the accompanying drawings. In the drawing demonstrate:
  • 1 a perspective view of a two-cylinder piston fuel pump with a separate housing;
  • 2 a perspective view of a delivery module of the piston fuel pump of 1 ;
  • 3 a longitudinal section through the piston fuel pump of 2 ;
  • 4 a schematic representation of a drive shaft of the piston fuel pump of 2 seen in the axial direction;
  • 5 a representation similar 2 a three-cylinder piston fuel pump;
  • 6 a representation similar 4 the drive shaft of the piston fuel pump of 5 ;
  • 7 a schematic representation of a piston fuel pump with integrated drive shaft in the internal combustion engine.
  • A piston fuel pump carries in the 1 and 3 Overall, the reference number 10 , It includes a pump housing 12 and 2 Cylinder arranged in a row in a row 14a and 14b , The cylinders 14a and 14b are each by a structurally identical conveyor module 16 formed separately in 2 is shown. The two conveyor modules 16 are in corresponding stepped holes, which receiving openings 18 form and in the pump housing 12 are present, plugged in and by means of a flange 20 and screws 22 on the pump housing 12 attached (for illustrative purposes, the reference numerals in the 1 and 3 only for the cylinder 14a entered.
  • In the pump housing 12 is one for the conveyor modules 16 common drive shaft 24 With three bearings 26 stored. At her in the 1 and 3 right end has the drive shaft 24 via a coupling piece 28 for coupling with an internal combustion engine drive.
  • Each conveyor module 16 includes a cylinder housing 30 , a piston sleeve 32 in which a piston 34 is guided, a sealing piece 36 , which is the conveyor module 16 opposite the pump housing 12 seals, one on the piston 34 attached spring plate 38 and one between spring plate and sealing piece 36 Tense piston spring 40 that the piston 34 to the drive shaft 24 acted upon.
  • To a conveyor module 16 also include a pump room 42 , the inlet valve, not shown, with a low pressure port 44 and via a likewise not shown outlet valve with a high-pressure connection 46 is connectable. The low pressure connection 44 For example, it can be connected to the outlet of an electric prefeed pump, which provides a certain amount of pressure. The high pressure connection 46 in turn may be connected to a fuel pressure accumulator ("common rail") are connected to the fuel injectors for direct injection of fuel into the combustion chambers of the internal combustion engine. To a conveyor module 16 may also be an electromagnetically actuated quantity control valve 48 belong, through which the delivery room 42 temporarily with the low pressure connection 44 can be connected, reducing the flow rate of the piston fuel pump 10 can be adjusted.
  • The design of the for both conveyor modules 16 common drive shaft 24 goes out of the 3 and 4 after: then includes the drive shaft 24 two cam sections 50a and 50b , which in each case two oppositely arranged same cam 52 exhibit. The drive shaft 24 thus has a total of four identical cams 52 on. The highest elevations of the oppositely arranged cams 52 of the cam section 50a are by an imaginary cam axle 54a connected with each other. The highest elevations of the oppositely arranged cams 52 of the cam section 50b are by a likewise imaginary cam axle 54b connected with each other. The cam axes 54a and 54b are around a central axis 56 the drive shaft 24 tilted ninety degrees to each other. This is achieved as if from 4 it can be seen that all cams 52 the cam sections 50a and 50b , in the circumferential direction of the drive shaft 24 seen, are evenly distributed, namely always at an angle of ninety degrees.
  • Between pistons 34 and cam section 50a respectively. 50b is a roller 57 available. In operation, with rotating drive shaft 24 , rolls the roller 57 on the cam section 50a respectively. 50b , causing the piston 34 is put into a float.
  • Another embodiment of a piston fuel pump 10 is in the 5 and 6 shown. Here, as below, it applies that such elements and regions which have equivalent functions to elements and regions which have already been explained in connection with a previously described exemplary embodiment are not explained again in detail. They also carry the same reference numerals.
  • At the piston fuel pump 10 from 5 it is a three-cylinder piston fuel pump. The corresponding cylinders 14 are provided with the indices a, b and c. Accordingly, the drive shaft includes 24 three cam sections 50a . 50b and 50c each with the same cam 52 , One recognizes 6 that also here all cams 52 the cam sections 50a to c in the circumferential direction of the drive shaft 24 Seen, evenly distributed. For this purpose, the cam axes 54a to c around the central axis 56 the drive shaft 24 tilted at an angle of sixty degrees to each other.
  • The previously described embodiments of piston fuel pumps 10 included a separate and separate from the engine pump housing 12 , At the in 7 Shown embodiment, the pump housing 12 through an engine block 58 the internal combustion engine formed in the receiving openings 18 are present, in which the conveyor modules 16 be plugged in.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
  • Cited patent literature
    • - DE 10322604 A1 [0002]

Claims (6)

  1. Piston fuel pump ( 10 ) for an internal combustion engine having a housing ( 12 ), with several cylinders in series ( 14 ), which by identical delivery modules ( 16 ) formed in corresponding receiving openings ( 18 ) in the housing ( 12 ) are inserted, and with a common drive shaft ( 24 ) for the conveyor modules ( 16 ), which for each conveyor module ( 16 ) a cam portion ( 50 ), characterized in that the cam portion ( 50 ) of a conveyor module ( 16 ) two oppositely arranged identical cams ( 52 ) whose highest elevations by a cam axis ( 54 ) and that the cam axes ( 54 ) of the cam sections ( 50 ) about the central axis ( 56 ) of the drive shaft ( 24 ) are tilted to each other so that all cams ( 52 ), in the circumferential direction of the drive shaft ( 24 ) are evenly distributed.
  2. Piston fuel pump ( 10 ) according to claim 1, characterized in that between a piston ( 34 ) of a conveyor module ( 16 ) and the drive shaft a roller ( 57 ) is arranged.
  3. Piston fuel pump ( 10 ) according to one of the preceding claims, characterized in that it comprises two cylinders ( 14 ) and the two cam axes ( 54 ) are tilted by 90 ° to each other.
  4. Piston fuel pump ( 10 ) according to one of claims 1 or 2, characterized in that it comprises three cylinders ( 14 ) and the three cam axes ( 54 ) are tilted at 60 ° to each other.
  5. Piston fuel pump ( 10 ) according to one of the preceding claims, characterized in that the drive shaft ( 24 ) is integrated in the internal combustion engine.
  6. Piston fuel pump ( 10 ) according to one of claims 1 to 4, characterized in that the drive shaft ( 24 ) is arranged outside the internal combustion engine and coupled to a drive of the internal combustion engine.
DE200810040122 2008-07-03 2008-07-03 Piston fuel pump for an internal combustion engine Withdrawn DE102008040122A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200810040122 DE102008040122A1 (en) 2008-07-03 2008-07-03 Piston fuel pump for an internal combustion engine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810040122 DE102008040122A1 (en) 2008-07-03 2008-07-03 Piston fuel pump for an internal combustion engine
PCT/EP2009/055353 WO2010000522A1 (en) 2008-07-03 2009-05-04 Piston fuel pump for an internal combustion engine

Publications (1)

Publication Number Publication Date
DE102008040122A1 true DE102008040122A1 (en) 2010-01-07

Family

ID=40974652

Family Applications (1)

Application Number Title Priority Date Filing Date
DE200810040122 Withdrawn DE102008040122A1 (en) 2008-07-03 2008-07-03 Piston fuel pump for an internal combustion engine

Country Status (2)

Country Link
DE (1) DE102008040122A1 (en)
WO (1) WO2010000522A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7705370B2 (en) 2005-11-01 2010-04-27 Massachusetts Institute Of Technology Monolithically integrated photodetectors

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10322604A1 (en) 2003-05-20 2004-12-09 Robert Bosch Gmbh Set of piston pumps, in particular fuel pumps for internal combustion engines with direct fuel injection

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09222056A (en) * 1996-02-19 1997-08-26 Denso Corp Fuel injection device
JP4467469B2 (en) * 2005-06-08 2010-05-26 ボッシュ株式会社 Fuel supply pump and tappet structure

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10322604A1 (en) 2003-05-20 2004-12-09 Robert Bosch Gmbh Set of piston pumps, in particular fuel pumps for internal combustion engines with direct fuel injection

Also Published As

Publication number Publication date
WO2010000522A1 (en) 2010-01-07

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Legal Events

Date Code Title Description
8139 Disposal/non-payment of the annual fee
R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee

Effective date: 20110201