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WO2018091366A1 - Pumping assembly for feeding fuel, preferably diesel fuel, to an internal combustion engine - Google Patents

Pumping assembly for feeding fuel, preferably diesel fuel, to an internal combustion engine Download PDF

Info

Publication number
WO2018091366A1
WO2018091366A1 PCT/EP2017/078878 EP2017078878W WO2018091366A1 WO 2018091366 A1 WO2018091366 A1 WO 2018091366A1 EP 2017078878 W EP2017078878 W EP 2017078878W WO 2018091366 A1 WO2018091366 A1 WO 2018091366A1
Authority
WO
WIPO (PCT)
Prior art keywords
cylinder
pumping assembly
longitudinal axis
assembly according
pump body
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/EP2017/078878
Other languages
French (fr)
Inventor
Alessandro Di Monte
Luisa MOSCARELLA
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 WO2018091366A1 publication Critical patent/WO2018091366A1/en
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
    • 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
    • F02M59/02—Pumps 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
    • F02M59/04—Pumps 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 special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—Pumps 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 special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
    • 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
    • F02M59/464—Inlet valves of the check valve type
    • 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
    • F04B1/0443—Draining of the housing; Arrangements for handling leaked fluids
    • 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
    • F04B1/0448—Sealing means, e.g. for shafts or housings
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/007—Cylinder heads
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/22—Arrangements for enabling ready assembly or disassembly
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/803—Fuel injection apparatus manufacture, repair or assembly using clamp elements and fastening means; e.g. bolts or screws
    • 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
    • F02M59/02—Pumps 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
    • F02M59/025—Pumps 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 a single piston
    • 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
    • F02M59/02—Pumps 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
    • F02M59/10—Pumps 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
    • F02M59/102—Mechanical drive, e.g. tappets or cams

Definitions

  • the present invention relates to a pumping assembly for feeding fuel, preferably diesel fuel, to an internal combustion engine.
  • the present invention relates to a pumping assembly of the type comprising a high-pressure pump, in the case in question a piston pump, for feeding the fuel to the internal combustion engine; and a low-pressure or pre-feed pump for feeding the fuel from a storage tank to the piston pump.
  • the piston pump comprises a pump body; at least one cylinder formed in the pump body; a piston engaged in a sliding manner in the cylinder; and an actuating device for moving the piston with an intake stroke forcing the fuel into the cylinder and with a compression stroke compressing the fuel contained in the said cylinder.
  • the pump body comprises a support casing which has a central hole for housing at least part of the actuating device and is also provided with at least one side hole extending transversely relative to the said central hole.
  • Each side hole is closed by a head, which is fixed to the support casing, and is passed through by a through-hole comprising a narrow portion defining the cylinder and a wide portion connected to the narrow portion in the region of a shoulder.
  • the wide portion defines, together with a closing lid screwed onto the said wide portion, an intake chamber connected to the cylinder by means of an intake valve.
  • the wide portion of the head and the closing lid are coupled together in a fluid- tight manner by means of an O-ring seal which extends coaxially with respect to a longitudinal axis of the cylinder and is axially locked between a bottom wall of the closing lid and an end face of the wide portion of the head.
  • the O-ring seal is unable to ensure a correct fluid-tight connection between the head and the closing lid.
  • the object of the present invention is to provide a pumping assembly for feeding fuel, preferably diesel fuel, to an internal combustion engine, which does not have the aforementioned drawbacks and which is simple and inexpensive to produce.
  • a pumping assembly for feeding fuel, preferably diesel fuel, to an internal combustion engine as claimed in the attached claims is provided.
  • Figure 1 is a first schematic cross-sectional view, with parts removed for clarity, of a preferred embodiment of the pumping assembly according to the present invention
  • Figure 2 is a second schematic cross-sectional view, with parts removed for clarity, of the pumping assembly shown in Figure 1;
  • Figure 3 is a schematic cross-sectional view, on a larger scale and with parts removed for clarity, of a detail of the pumping assembly shown in Figures 1 and 2; and
  • Figure 4 is a schematic cross-sectional view of a variant of the detail shown in Figure 3.
  • 1 denotes in its entirety a pumping assembly for feeding fuel, preferably diesel fuel, to an internal combustion engine (not shown).
  • fuel preferably diesel fuel
  • the pumping assembly 1 comprises a piston pump 2 for feeding the fuel to the said internal combustion engine (not shown); and a pre-feed pump 3, for example a gear pump, for feeding the fuel to the said pump 2.
  • the pumping assembly 1 has a pump body comprising a support casing 4 which is provided with a central hole 5 having a longitudinal axis 6 and also has a side hole 7 which has a longitudinal axis 8 transverse to the axis 6 and extends radially towards the outside of the casing 4 from the said hole 5.
  • the hole 7 is closed by a head 9 which is arranged in contact with the casing 4 and has a lug 10 projecting inside the hole 7 coaxially with respect to the axis 8.
  • the head 9 has a central hole 11 which is formed through the head 9 coaxially with respect to the axis 8 and comprises a wide portion 12 and a narrow portion 13 aligned with each other along the said axis 8.
  • the portion 13 faces the hole 5 and defines a cylinder 14 engaged in a sliding manner by a piston 15 movable along the cylinder 14, under the thrust of an actuating device 16, with a reciprocating rectilinear movement comprising an intake stroke forcing the fuel into the cylinder 14 and a compression stroke compressing the fuel contained inside the said cylinder 14.
  • the device 16 comprises a tubular sleeve 17 which is engaged in a sliding manner inside the hole 7 coaxially with respect to the axis 8, extends around the cylinder 14 and has an inner annular flange 18 which projects radially from an inner surface of the sleeve 17 and divides the said sleeve 17 into two cylindrical portions 19, 20, the portion 19 of which faces the hole 5.
  • the device 16 also has a tappet arrangement 21 comprising a coupling block 22 with a substantially cylindrical shape which is fixed in position by means of interference inside the portion 19, is arranged in contact with the flange 18 and supports a tappet roller 23.
  • the roller 23 projects from the block 22 towards the hole 5 and is rotatably coupled with the block 22 so as to rotate, relative to the said block 22, about its longitudinal axis 24 which is substantially perpendicular to the axis 8.
  • the flange 18 supports an annular disk 25 which extends around the piston 15, is inserted inside the portion 20 of the sleeve 17, coaxially with respect to the axis 8, and has an outer perimetral edge axially facing the flange 18 and an inner perimetral edge axially facing a head of the said piston 15.
  • the device 16 comprises, moreover, a compression spring 26 which is mounted between the lug 10 and the sleeve 17, coaxially with respect to the axis 8, and is arranged between the head 9 and the disk 25 so as to move, and normally keep, the disk 25 in contact with the flange 18 and the roller 23 in contact with a cam 27 formed on an outer surface of an intermediate portion of a drive shaft 28 mounted through the hole 5 so as to rotate, with respect to the casing 4, about the axis 6.
  • a compression spring 26 which is mounted between the lug 10 and the sleeve 17, coaxially with respect to the axis 8, and is arranged between the head 9 and the disk 25 so as to move, and normally keep, the disk 25 in contact with the flange 18 and the roller 23 in contact with a cam 27 formed on an outer surface of an intermediate portion of a drive shaft 28 mounted through the hole 5 so as to rotate, with respect to the casing 4, about the axis 6.
  • the wide portion 12 is closed by a lid 29 which has a cup-like shape with its concavity directed towards the cylinder 14, is screwed onto an outer face of the portion 12 and is bounded by a bottom wall 30 substantially perpendicular to the axis 8.
  • the pumping assembly 1 further comprises a sealing device 31 for coupling together in a fluid-tight manner the portion 12 of the head 9 and the lid 29.
  • the device 31 comprises an annular tooth 32, which projects axially from the wall 30, extends coaxially with respect to the axis 8 and is bounded by an inner side face 33 and an outer side face 34.
  • Each face 33, 34 has, in the example here, a frustoconical shape and is therefore oriented at an angle other than 0° and 90° relative to the axis 8.
  • the device 31 furthermore comprises an annular recess 35 which is formed on one end face 36 of the portion 12, opens out on the face 36 and is configured to form the tooth 32.
  • the recess 35 is bounded by an inner side face 37 and by an outer side face 38 which have, in the example here, a frustoconical shape and are therefore oriented at respective angles other than 0° and 90° relative to the axis 8.
  • the faces 33, 34 of the tooth 32 and the faces 37, 38 of the recess 35 are configured and oriented in such a way that, following screwing of the lid 29 onto the head 9, the face 33 of the tooth 32 comes into contact with the face 37 of the recess 35 so as to couple together in a fluid-tight manner the head 9 and the lid 29.
  • one of the faces 33, 37 is cylindrical and coaxial with the axis 8; the tooth 32 projects axially from the face 36 and the recess 35 is formed in the wall 30; the faces 33, 34 have the same inclination or different inclinations relative to the axis 8; and the faces 37, 38 have the same inclination or different inclinations relative to the axis 8.
  • the variant shown in Figure 4 differs from that shown in Figure 3 solely in that, in it, the faces 33, 34 of the tooth 32 and the faces 37, 38 of the recess 35 are configured and oriented in such a way that, following screwing of the lid 29 onto the head 9, the face 33 of the tooth 32 comes into contact with the face 37 of the recess 35 and the face 34 of the tooth 32 comes into contact with the face 38 of the recess 35 so as to couple together in a fluid-tight manner the head 9 and the lid 29.
  • the lid 29 defines, together with the portion 12, an intake chamber 39 connected to the cylinder 14 via an intake valve 40 comprising an elongated closing member 41 which is mounted coaxially with respect to the axis 8, extends through the head 9 and is movable parallel to the axis 8 between a position for closing and a position for opening the said valve 40.
  • the closing member 41 is displaced towards and normally kept in its closing position by a spring 42 arranged between the head 9 and a disk 43 fixed to the closing member 41 transversely with respect to the axis 8.
  • the sealing device 31 which is incorporated in the head 9 and in the lid 29, allows the head 9 and the lid 29 to be coupled together in a fluid-tight manner with a relatively small number of components and ensures relatively high contact pressures between the faces 33, 37 and/or between the faces 34, 38 owing to the axial load generated during screwing of the lid 29 onto the head 9 and the radial interference due to the frustoconical configuration of at least one of the faces 33, 37 and/or at least one of the faces 34, 38.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

A pumping assembly for feeding fuel, preferably diesel fuel, to an internal combustion engine, has a pump body (4, 9), at least one cylinder (14) formed in the pump body (4, 9), a closing lid (29) defining, together with the pump body (4, 9), an intake chamber (39) for drawing the fuel into the cylinder (14), an annular tooth (32) projecting from the closing lid (29) and an annular recess (35) formed in the pump body (4, 9) for receiving and housing the annular tooth (32) so as to couple the pump body (4, 9) and the closing lid (29) together in a fluid-tight manner.

Description

Description
Title
PUMPING ASSEMBLY FOR FEEDING FU EL, PREFERABLY DIESEL FU EL, TO AN INTERNAL COMBUSTION ENGINE
The present invention relates to a pumping assembly for feeding fuel, preferably diesel fuel, to an internal combustion engine.
In particular, the present invention relates to a pumping assembly of the type comprising a high-pressure pump, in the case in question a piston pump, for feeding the fuel to the internal combustion engine; and a low-pressure or pre-feed pump for feeding the fuel from a storage tank to the piston pump.
The piston pump comprises a pump body; at least one cylinder formed in the pump body; a piston engaged in a sliding manner in the cylinder; and an actuating device for moving the piston with an intake stroke forcing the fuel into the cylinder and with a compression stroke compressing the fuel contained in the said cylinder.
Generally, the pump body comprises a support casing which has a central hole for housing at least part of the actuating device and is also provided with at least one side hole extending transversely relative to the said central hole.
Each side hole is closed by a head, which is fixed to the support casing, and is passed through by a through-hole comprising a narrow portion defining the cylinder and a wide portion connected to the narrow portion in the region of a shoulder. The wide portion defines, together with a closing lid screwed onto the said wide portion, an intake chamber connected to the cylinder by means of an intake valve.
The wide portion of the head and the closing lid are coupled together in a fluid- tight manner by means of an O-ring seal which extends coaxially with respect to a longitudinal axis of the cylinder and is axially locked between a bottom wall of the closing lid and an end face of the wide portion of the head.
Owing to the presence of the O-ring seal, the known pumping assemblies of the type described above have a relatively large number of components.
Moreover, the O-ring seal is unable to ensure a correct fluid-tight connection between the head and the closing lid.
The object of the present invention is to provide a pumping assembly for feeding fuel, preferably diesel fuel, to an internal combustion engine, which does not have the aforementioned drawbacks and which is simple and inexpensive to produce.
According to the present invention a pumping assembly for feeding fuel, preferably diesel fuel, to an internal combustion engine as claimed in the attached claims is provided.
The present invention will now be described with reference to the attached drawings, which show a non-limiting example of embodiment thereof in which:
Figure 1 is a first schematic cross-sectional view, with parts removed for clarity, of a preferred embodiment of the pumping assembly according to the present invention;
Figure 2 is a second schematic cross-sectional view, with parts removed for clarity, of the pumping assembly shown in Figure 1; Figure 3 is a schematic cross-sectional view, on a larger scale and with parts removed for clarity, of a detail of the pumping assembly shown in Figures 1 and 2; and
Figure 4 is a schematic cross-sectional view of a variant of the detail shown in Figure 3.
With reference to Figures 1 and 2, 1 denotes in its entirety a pumping assembly for feeding fuel, preferably diesel fuel, to an internal combustion engine (not shown).
The pumping assembly 1 comprises a piston pump 2 for feeding the fuel to the said internal combustion engine (not shown); and a pre-feed pump 3, for example a gear pump, for feeding the fuel to the said pump 2.
The pumping assembly 1 has a pump body comprising a support casing 4 which is provided with a central hole 5 having a longitudinal axis 6 and also has a side hole 7 which has a longitudinal axis 8 transverse to the axis 6 and extends radially towards the outside of the casing 4 from the said hole 5.
The hole 7 is closed by a head 9 which is arranged in contact with the casing 4 and has a lug 10 projecting inside the hole 7 coaxially with respect to the axis 8.
The head 9 has a central hole 11 which is formed through the head 9 coaxially with respect to the axis 8 and comprises a wide portion 12 and a narrow portion 13 aligned with each other along the said axis 8.
The portion 13 faces the hole 5 and defines a cylinder 14 engaged in a sliding manner by a piston 15 movable along the cylinder 14, under the thrust of an actuating device 16, with a reciprocating rectilinear movement comprising an intake stroke forcing the fuel into the cylinder 14 and a compression stroke compressing the fuel contained inside the said cylinder 14. The device 16 comprises a tubular sleeve 17 which is engaged in a sliding manner inside the hole 7 coaxially with respect to the axis 8, extends around the cylinder 14 and has an inner annular flange 18 which projects radially from an inner surface of the sleeve 17 and divides the said sleeve 17 into two cylindrical portions 19, 20, the portion 19 of which faces the hole 5.
The device 16 also has a tappet arrangement 21 comprising a coupling block 22 with a substantially cylindrical shape which is fixed in position by means of interference inside the portion 19, is arranged in contact with the flange 18 and supports a tappet roller 23.
The roller 23 projects from the block 22 towards the hole 5 and is rotatably coupled with the block 22 so as to rotate, relative to the said block 22, about its longitudinal axis 24 which is substantially perpendicular to the axis 8.
The flange 18 supports an annular disk 25 which extends around the piston 15, is inserted inside the portion 20 of the sleeve 17, coaxially with respect to the axis 8, and has an outer perimetral edge axially facing the flange 18 and an inner perimetral edge axially facing a head of the said piston 15.
The device 16 comprises, moreover, a compression spring 26 which is mounted between the lug 10 and the sleeve 17, coaxially with respect to the axis 8, and is arranged between the head 9 and the disk 25 so as to move, and normally keep, the disk 25 in contact with the flange 18 and the roller 23 in contact with a cam 27 formed on an outer surface of an intermediate portion of a drive shaft 28 mounted through the hole 5 so as to rotate, with respect to the casing 4, about the axis 6.
The wide portion 12 is closed by a lid 29 which has a cup-like shape with its concavity directed towards the cylinder 14, is screwed onto an outer face of the portion 12 and is bounded by a bottom wall 30 substantially perpendicular to the axis 8. In accordance with that shown in Figures 1, 2 and 3, the pumping assembly 1 further comprises a sealing device 31 for coupling together in a fluid-tight manner the portion 12 of the head 9 and the lid 29.
The device 31 comprises an annular tooth 32, which projects axially from the wall 30, extends coaxially with respect to the axis 8 and is bounded by an inner side face 33 and an outer side face 34.
Each face 33, 34 has, in the example here, a frustoconical shape and is therefore oriented at an angle other than 0° and 90° relative to the axis 8.
The device 31 furthermore comprises an annular recess 35 which is formed on one end face 36 of the portion 12, opens out on the face 36 and is configured to form the tooth 32.
The recess 35 is bounded by an inner side face 37 and by an outer side face 38 which have, in the example here, a frustoconical shape and are therefore oriented at respective angles other than 0° and 90° relative to the axis 8.
The faces 33, 34 of the tooth 32 and the faces 37, 38 of the recess 35 are configured and oriented in such a way that, following screwing of the lid 29 onto the head 9, the face 33 of the tooth 32 comes into contact with the face 37 of the recess 35 so as to couple together in a fluid-tight manner the head 9 and the lid 29.
According to some variants not shown: one of the faces 33, 37 is cylindrical and coaxial with the axis 8; the tooth 32 projects axially from the face 36 and the recess 35 is formed in the wall 30; the faces 33, 34 have the same inclination or different inclinations relative to the axis 8; and the faces 37, 38 have the same inclination or different inclinations relative to the axis 8.
The variant shown in Figure 4 differs from that shown in Figure 3 solely in that, in it, the faces 33, 34 of the tooth 32 and the faces 37, 38 of the recess 35 are configured and oriented in such a way that, following screwing of the lid 29 onto the head 9, the face 33 of the tooth 32 comes into contact with the face 37 of the recess 35 and the face 34 of the tooth 32 comes into contact with the face 38 of the recess 35 so as to couple together in a fluid-tight manner the head 9 and the lid 29.
The lid 29 defines, together with the portion 12, an intake chamber 39 connected to the cylinder 14 via an intake valve 40 comprising an elongated closing member 41 which is mounted coaxially with respect to the axis 8, extends through the head 9 and is movable parallel to the axis 8 between a position for closing and a position for opening the said valve 40.
The closing member 41 is displaced towards and normally kept in its closing position by a spring 42 arranged between the head 9 and a disk 43 fixed to the closing member 41 transversely with respect to the axis 8.
The sealing device 31, which is incorporated in the head 9 and in the lid 29, allows the head 9 and the lid 29 to be coupled together in a fluid-tight manner with a relatively small number of components and ensures relatively high contact pressures between the faces 33, 37 and/or between the faces 34, 38 owing to the axial load generated during screwing of the lid 29 onto the head 9 and the radial interference due to the frustoconical configuration of at least one of the faces 33, 37 and/or at least one of the faces 34, 38.

Claims

Claims
1. - Pumping assembly for feeding fuel, preferably diesel fuel, to an internal combustion engine, the pumping assembly comprising a pump body (4, 9); at least one cylinder (14) which is formed in the pump body (4, 9) and has a longitudinal axis (8); a piston (15) which is engaged in a sliding manner in the cylinder (14); an actuating device (16) for moving the piston (15) with an intake stroke forcing fuel into the cylinder (14) and with a compression stroke compressing the fuel contained in the cylinder (14); a closing lid (29) which is mounted coaxial with the longitudinal axis (8) so as to define, together with the pump body (4, 9), an intake chamber (39) which is connected to the cylinder (14) via an intake valve (40); and a sealing device (31) for coupling the pump body (4, 9) and the closing lid (29) to one another in a fluid-tight manner; and being characterized in that the sealing device (31) comprises an annular tooth (32) projecting from one of said pump body (4, 9) and closing lid (29) and an annular recess (35) formed in the other one of said pump body (4, 9) and closing lid (29) and designed to receive and house the annular tooth (32).
2. - Pumping assembly according to claim 1, wherein the annular tooth (32) has at least one first coupling surface (33) and the annular recess (35) has at least one second coupling surface (37) arranged in contact with the first coupling surface
(33); said first and second coupling surfaces (33, 37) being oriented at respective angles, different from one another, relative to the longitudinal axis (8) of the cylinder (14). 3.- Pumping assembly according to claim 2, wherein at least one of said first and second coupling surfaces (33, 37) has the shape of a truncated cone and is oriented at an angle ranging from 0° to 90° relative to the longitudinal axis (8) of the cylinder (14).
4. - Pumping assembly according to claim 2 or 3, wherein one of said first and second coupling surfaces (33, 37) is cylindrical and coaxial with the longitudinal axis (8) of the cylinder (14) and the other one of said first and second coupling surfaces (33, 37) has the shape of a truncated cone and is oriented at an angle ranging from 0° to 90° relative to the longitudinal axis (8) of the cylinder (14).
5. - Pumping assembly according to claim 2 or 3, wherein said first and second coupling surfaces (33, 37) have the shape of a truncated cone and are oriented at respective angles, different from one another, relative to the longitudinal axis (8) of the cylinder (14).
6. - Pumping assembly according to any one of the preceding claims, wherein the annular tooth (32) has at least one third coupling surface (34) opposite the first coupling surface (33) and the annular recess (35) has at least one fourth coupling surface (38) opposite the second coupling surface (37) and arranged in contact with the third coupling surface (34); said third and fourth coupling surfaces (34, 38) being oriented at respective angles, different from one another, relative to the longitudinal axis (8) of the cylinder (14).
7. - Pumping assembly according to claim 6, wherein said first and third coupling surfaces (33, 34) are oriented at respective angles, equal to or different from one another, relative to the longitudinal axis (8) of the cylinder (14).
8. - Pumping assembly according to claim 6 or 7, wherein said second and fourth coupling surfaces (37, 38) are oriented at respective angles, equal to or different from one another, relative to the longitudinal axis (8) of the cylinder (14).
9. - Pumping assembly according to any one of the claims 2 to 8, wherein each said coupling surface (33, 34, 37, 38) is substantially coaxial with the longitudinal axis (8) of the cylinder (14).
10. - Pumping assembly according to any one of the preceding claims, wherein the closing lid (29) is screwed onto the pump body (4, 9).
11. - Pumping assembly according to any of the preceding claims, wherein the pump body (4, 9) comprises a support casing (4), which is engaged in a rotatable manner by a drive shaft (28) of the actuating device (16), and a head (9), which is mounted on the support casing (4) and has a central hole (5) comprising, in turn, a narrow portion (13) defining the cylinder (14) and a wide portion (12).
12. - Pumping assembly according to claim 11, wherein the closing lid (29) is cup- shaped, is bounded by a bottom wall (30) that is substantially perpendicular to the longitudinal axis (8) of the cylinder (14) and is screwed onto the wide portion (12); the annular tooth (32) and the annular recess (35) being formed one in the bottom wall (30) of the closing lid (29) and the other one in an end face (36) of the wide portion (12).
PCT/EP2017/078878 2016-11-18 2017-11-10 Pumping assembly for feeding fuel, preferably diesel fuel, to an internal combustion engine Ceased WO2018091366A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102016000117077 2016-11-18
IT102016000117077A IT201600117077A1 (en) 2016-11-18 2016-11-18 PUMPING GROUP FOR FUEL SUPPLEMENTATION, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE

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WO2018091366A1 true WO2018091366A1 (en) 2018-05-24

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009001560A1 (en) * 2009-03-16 2010-09-23 Robert Bosch Gmbh High-pressure pump for e.g. fuel injection device of internal-combustion engine of motor vehicle, has inlet and return line that are separated from each other and sealed against each other via sealing element
DE102012210107A1 (en) * 2012-06-15 2013-12-19 Robert Bosch Gmbh High-pressure pump for fuel injection system, has guide sleeve that is fitted directly or indirectly via valve carrier into bore for guiding valve element, and possesses feed groove in guide surface
WO2016102138A1 (en) * 2014-12-24 2016-06-30 Robert Bosch Gmbh Pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009001560A1 (en) * 2009-03-16 2010-09-23 Robert Bosch Gmbh High-pressure pump for e.g. fuel injection device of internal-combustion engine of motor vehicle, has inlet and return line that are separated from each other and sealed against each other via sealing element
DE102012210107A1 (en) * 2012-06-15 2013-12-19 Robert Bosch Gmbh High-pressure pump for fuel injection system, has guide sleeve that is fitted directly or indirectly via valve carrier into bore for guiding valve element, and possesses feed groove in guide surface
WO2016102138A1 (en) * 2014-12-24 2016-06-30 Robert Bosch Gmbh Pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine

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