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WO2009068448A1 - Pompe à haute pression - Google Patents

Pompe à haute pression Download PDF

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Publication number
WO2009068448A1
WO2009068448A1 PCT/EP2008/065556 EP2008065556W WO2009068448A1 WO 2009068448 A1 WO2009068448 A1 WO 2009068448A1 EP 2008065556 W EP2008065556 W EP 2008065556W WO 2009068448 A1 WO2009068448 A1 WO 2009068448A1
Authority
WO
WIPO (PCT)
Prior art keywords
groove
bush
pump
compartment
shaft
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.)
Ceased
Application number
PCT/EP2008/065556
Other languages
English (en)
Inventor
Angelo Antonacci
Alessandro Italiano
Nello Medoro
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 WO2009068448A1 publication Critical patent/WO2009068448A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts

Definitions

  • the present invention relates to a high-pressure pump, in particular for supplying fuel to a common rail of an internal-combustion engine.
  • a high-pressure pump comprises a pump body with a compartment able to house a mechanism for actuating at least one pumping member; a shaft rotatable about an axis; a bush which is forced-fitted with interference inside a cylindrical seat of the pump body, has the function of supporting the shaft and forms a passage between an inner surface of the bush and an outer surface of the shaft; and a duct which connects the compartment to the passage in order to supply lubricating liquid to the passage.
  • the duct which connects the compartment to the passage is formed inside the pump body and supplies part of the fuel, usually diesel fuel, which in turn is supplied to the high-pressure pump via a pre-supply pump.
  • the duct comprises three supply holes: two supply holes radial with respect to the axis of the shaft; and a supply hole parallel to the axis of the shaft which intersects the two radial supply holes. Consequently, three different boring operations and two pressing operations for closing the free ends of the radial supply holes are necessary. These operations make the procedure for manufacturing the high-pressure pump complicated and costly.
  • the object of the present invention is to provide a high-pressure pump which reduces the cost of manufacturing the high-pressure pump. According to the invention this object is achieved by a high-pressure pump characterized in that the duct comprises a groove arranged between the pump body and the bush and at least one hole formed in the bush and arranged opposite the groove.
  • the duct is substantially delimited by the pump body and by the bush and boring of the pump body is not required. According to the present invention formation of the groove requires a single chip removal machining operation instead of three boring operations.
  • FIG. 1 is a longitudinally sectioned view, with parts removed for the sake of clarity, of a high-pressure pump designed according to the present invention.
  • FIG. 2 is a longitudinally sectioned view of a detail of the high-pressure pump shown in Figure 1, overturned with respect to Figure 1, with further parts removed for the sake of clarity.
  • Figure 1 shows in its entirety a high-pressure pump designed to compress the fuel to pressures in the region of 2000 bar in order to supply, via a common rail, an internal-combustion engine not shown in Figure 1.
  • the high-pressure pump comprises a pump body 1, a compartment 2 able to house an actuating mechanism, not shown in Figure 1; and an actuating shaft 3 which is shown in Figure 1 in broken lines and is rotatable about an axis A.
  • the actuating mechanism is able to actuate at least one pumping member (not shown in Figure 1) which is able to perform an alternating movement in the radial direction with respect to the shaft 3.
  • the pump body 1 comprises an annular wall 4 which has three seats 5 for housing respective pumping members (only two seats 5 are shown in Figure 1) and three service openings 6 (only two of which are shown in Figure 1) closed by respective plugs 7, only one of which shown in Figure 1.
  • the seats 5 for the pumping members are arranged at 120° relative to each other about the axis A.
  • the pump body 1 comprises a wall 8 of considerable thickness which extends perpendicularly with respect to the axis A, is adjacent to the wall 4 and has an opening 9 along the axis A for housing the shaft 3.
  • the pump body 1 comprises an axial closing plate for the compartment 2, which is arranged on the opposite side of the wall 8 and is not shown in Figure 1.
  • the opening 9 is delimited by a cylindrical seat 10 and by an annular lug 11 of the wall 8.
  • the minimum diameter of the annular lug 11 is smaller than the diameter of the cylindrical seat 10.
  • the high-pressure pump comprises a bush 12 which is made of material with a low coefficient of friction, usually bronze, and has the function of supporting a portion 13 of the shaft 3 which has a ground outer surface 14.
  • the actuating mechanism generally comprises a cam which is fixed onto another portion of the shaft 3 inside the compartment 2. The cam is designed to cooperate, in a known manner, with a prismatic ring, of the known type and not shown in the accompanying figures, so as to actuate in sequence the three pumping members not shown in the accompanying figures.
  • the bush 12 essentially comprises a cylindrical wall which has an outer surface 15 and a ground inner surface 16 rotatably mating with the outer surface 14 of the portion 13 of the shaft 3.
  • the bush 12 is fixed with interference inside the cylindrical seat 10 of the pump body 1 so that it is fluid-tight with the pump body 1.
  • the high-pressure pump is coupled in a fluid-tight manner with a portion 18 of the shaft 3 via the annular lug 11.
  • the portion 18, which has a diameter smaller than that of the portion 13, is connected to the portion 13 by an annular face 19 which is substantially perpendicular to the axis A and is situated facing the annular lug 11.
  • An annular chamber 20 is defined between the annular lug 11, the face 19, the portion 18 of the shaft 3 and the cylindrical seat 10 of the pump body 1 and communicates with the compartment 2 via a narrow passage 21 which extends between the bush 12 and the portion 13 of the shaft 3, in particular between the inner surface
  • the compartment 2 is designed to receive a part of the fuel supplied to the high-pressure pump so as to undergo a compression phase.
  • the fuel supplied to the high-pressure pump is generally provided by a tank (not shown in the accompanying figures) and is first compressed by a pre-supply pump (not shown in the accompanying figures) which compresses the fuel to a relatively low pressure of about 5 bar.
  • Part of the low-pressure fuel which is controlled by special valves, not shown in the accompanying figures, is sent to the compartment 2 via an inlet not shown in the accompanying figures.
  • the fuel fills the compartment 2, lubricating and cooling the actuating mechanism. From the compartment 2 the fuel flows out through an outlet, not visible in the figures, and is discharged into the tank (not shown).
  • the high-pressure pump comprises a duct 22 which is formed partly in the bush 12 and partly in the pump body 1 and connects the compartment 2 and the passage 21.
  • the duct 22 consists of a groove 23, formed in the pump body 1 along the cylindrical seat 10 housing the bush 12, and of at least one through-hole 24 passing through the cylindrical wall of the bush 12 and communicating with the groove 23. Therefore, the groove 23 and the hole 24 allow the fuel to pass from the compartment 2 to the passage 21 connecting together the cylindrical seat 10 and the outer surface 15 of the bush 12 via the groove 23 along the cylindrical seat 10.
  • the groove 23 extends axially and circumferential Iy along the cylindrical seat 10 and has a substantially helical form with a first end 25 in the region of the compartment 2 and a second end 26 in the region of the annular chamber 20.
  • the groove 23 has a curved cross-section and extends helically on the outer surface 16 over at least 90°, preferably over at least 180°.
  • the groove 23 has a portion 27 with a larger cross-section able to favour supplying of the fuel to the groove 23.
  • the groove 23 connects the compartment 2 to the annular chamber 20 so as to cool and lubricate suitably also the zone of the high-pressure pump adjacent to the annular chamber 20.
  • the low-pressure fuel is supplied to the compartment 2 and fills this compartment 2, lubricating the actuating mechanism of the high-pressure pump and flows out of the compartment towards a tank not shown in the accompanying figures.
  • Part of this fuel is supplied to the groove 23 in order to lubricate and cool the contact zone between the shaft 3 and the bush 12.
  • the groove 23 supplies the fuel to the passage 21 via the hole 24 between the outer surface 14 of the portion 13 of the shaft 3 and the inner surface 16 of the bush 12, lubricating and cooling effectively the contact zone between the bush 12 and the shaft 3.
  • the groove 23 also supplies the annular chamber 20 which, in turn, supplies the passage 21 along which the fuel flows back towards the compartment 2.
  • the groove 23 and the hole 24 define the delivery path of the fuel, while the passage 21 defines the return path of the fuel.
  • the duct 22 is obtained by means of a groove 23 along the cylindrical seat 10 of the pump body 1 and a radial hole 24 in the cylindrical wall of the bush 12. Therefore, machining of the duct 22 is greatly simplified and may be performed before fixing the bush 12 inside the seat 10, so that the high- pressure pump is less costly.
  • the high-pressure pump may have any number of pumping members.
  • the shape of the cross-section and the path along which the groove 23 extends may be different from those described.
  • Two or more axially spaced through-holes 24 may also be provided in the bush 12.
  • two or more ducts 22 which are angularly offset relative to each other and/or extend axially in a different manner may be envisaged.
  • the groove 23 may be formed along the outer surface 15 of the bush 12.
  • the groove 23 may be formed partly along the outer surface 15 of the bush 12 and partly along the cylindrical seat 10 of the pump body 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Abstract

L'invention concerne une pompe à haute pression qui comporte un corps de pompe (1) muni d'un compartiment (2) pouvant loger un mécanisme permettant d'actionner au moins un élément de pompage, un arbre (3) pouvant tourner autour d'un axe (A). Une bague (12), qui est ajustée en force avec une interférence à l'intérieur d'un siège cylindrique (10) du corps de pompe (1), a la fonction de supporter l'arbre (3) et forme un passage (21) entre la surface intérieure (16) de la bague (12) et la surface extérieure (14) de l'arbre (3). La pompe comprend une conduite (22) qui relie le compartiment (2) au passage (21) afin de fournir un liquide de lubrification au passage (21) et elle est sensiblement définie par une rainure (23) disposée entre le corps de pompe (1) et la bague (12) et par un alésage (24) formé dans la bague (12) et disposé à l'opposé de la rainure (23).
PCT/EP2008/065556 2007-11-30 2008-11-14 Pompe à haute pression Ceased WO2009068448A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20072259 ITMI20072259A1 (it) 2007-11-30 2007-11-30 Pompa di alta pressione
ITMI2007A002259 2007-11-30

Publications (1)

Publication Number Publication Date
WO2009068448A1 true WO2009068448A1 (fr) 2009-06-04

Family

ID=40314783

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/065556 Ceased WO2009068448A1 (fr) 2007-11-30 2008-11-14 Pompe à haute pression

Country Status (2)

Country Link
IT (1) ITMI20072259A1 (fr)
WO (1) WO2009068448A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19920168A1 (de) * 1998-05-16 1999-11-18 Luk Automobiltech Gmbh & Co Kg Radialkolbenpumpe
US20030101970A1 (en) * 2001-12-04 2003-06-05 Yasutaka Utsumi Fuel injection pump having feed pump assembly
WO2003048564A1 (fr) * 2001-12-01 2003-06-12 Robert Bosch Gmbh Pompe a piston radiaux a graissage force
EP1389683A2 (fr) * 2002-08-16 2004-02-18 Robert Bosch Gmbh Dispositif d'injection de carburant pour un moteur à combustion interne
WO2005054675A1 (fr) * 2003-12-03 2005-06-16 Robert Bosch Gmbh Pompe a pistons radiaux, destinee notamment a des systemes d'injection de carburant
EP1767771A1 (fr) * 2005-09-22 2007-03-28 Denso Corporation Pompe d'alimentation en combustible à haute pression

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19920168A1 (de) * 1998-05-16 1999-11-18 Luk Automobiltech Gmbh & Co Kg Radialkolbenpumpe
WO2003048564A1 (fr) * 2001-12-01 2003-06-12 Robert Bosch Gmbh Pompe a piston radiaux a graissage force
US20030101970A1 (en) * 2001-12-04 2003-06-05 Yasutaka Utsumi Fuel injection pump having feed pump assembly
EP1389683A2 (fr) * 2002-08-16 2004-02-18 Robert Bosch Gmbh Dispositif d'injection de carburant pour un moteur à combustion interne
WO2005054675A1 (fr) * 2003-12-03 2005-06-16 Robert Bosch Gmbh Pompe a pistons radiaux, destinee notamment a des systemes d'injection de carburant
EP1767771A1 (fr) * 2005-09-22 2007-03-28 Denso Corporation Pompe d'alimentation en combustible à haute pression

Also Published As

Publication number Publication date
ITMI20072259A1 (it) 2009-06-01

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