WO2020078612A1 - Pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine - Google Patents

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

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Publication number
WO2020078612A1
WO2020078612A1 PCT/EP2019/073547 EP2019073547W WO2020078612A1 WO 2020078612 A1 WO2020078612 A1 WO 2020078612A1 EP 2019073547 W EP2019073547 W EP 2019073547W WO 2020078612 A1 WO2020078612 A1 WO 2020078612A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
pumping unit
tappet
axis
piston
Prior art date
Application number
PCT/EP2019/073547
Other languages
French (fr)
Inventor
Michael IMHOF
Francesco Priore
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 WO2020078612A1 publication Critical patent/WO2020078612A1/en

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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
    • F02M59/02—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
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
    • 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
    • F04B1/0413—Cams
    • 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
    • F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam
    • 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
    • F04B1/0439—Supporting or guiding means for the pistons
    • 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
    • F04B1/053—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
    • 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
    • F04B53/18—Lubricating
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/045—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being eccentrics

Definitions

  • the present invention relates to a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine.
  • the present invention relates to a pumping unit of the type comprising a high-pressure pump for feeding fuel to an internal combustion engine; and a low- pressure pump for feeding the fuel from a storage tank to the high-pressure pump.
  • the high-pressure pump is a piston pump comprising a pump body; at least one cylinder formed in the pump body; and a piston slidably engaged inside the said cylinder.
  • the pumping unit also comprises an actuating device for displacing the piston along the cylinder with an alternating rectilinear movement comprising an intake stroke for drawing fuel into the cylinder and a compression stroke for compressing the fuel contained inside said cylinder.
  • the actuating device comprises a cam transmission shaft for displacing the piston with its compression stroke, a tappet system arranged between the piston and the cam transmission shaft, and a spring for displacing the piston with its intake stroke.
  • the tappet system comprises a support block which has a cup-shaped form, is slidably engaged inside the pump body and is provided with two engaging forks projecting from the support block towards the cam transmission shaft.
  • the tappet system further comprises a tappet roller slidably engaged with a support pin locked by means of snap engagement inside the two engaging forks.
  • the tappet roller has a length smaller than the length of the support pin, extends between the two engaging forks and is axially bounded by two substantially flat end faces each facing a side wall of a respective engaging fork.
  • the cam transmission shaft, the tappet system and the spring are housed inside a containing chamber which is separated in a fluid-tight manner from the cylinder and is connected to a lubrication circuit designed to feed lubricating oil inside the said containing chamber.
  • the lubrication circuit comprises a first lubrication channel which is formed in an outer surface of the support block, has a T-shaped form and comprises, in turn, an inlet section parallel to a longitudinal axis of the cylinder and an outlet section extending around the said longitudinal axis.
  • the lubrication circuit further comprises two second lubrication channels, each of which extends through the support block from a free end of the outlet section of the first lubrication channel and has an outlet hole facing a corresponding end face of the tappet roller.
  • the lubrication circuit furthermore extends through the pump body and is provided with a feed hole facing a free end of the inlet section of the first lubrication channel.
  • the pumping unit further comprises an intake valve for selectively controlling the feeding of the fuel into the cylinder; and a delivery valve for selectively controlling the feeding of the fuel to the internal combustion engine.
  • the pumping units of the type described above have a number of drawbacks mainly arising from the fact that the formation of the first lubrication channel on the outer surface of the support block is relatively complex and costly.
  • the known pumping units of the type described above have, moreover, the further drawback consisting in the fact that the first lubrication channel has a relatively long length, this resulting in relatively high pressure drops along the lubrication circuit and preventing correct lubrication of the tappet roller.
  • the object of the present invention is to provide a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine, which does not have the aforementioned drawbacks and is simple and inexpensive to produce.
  • a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine is provided, as claimed in the accompanying claims.
  • Figure 1 is a first, schematic, cross-sectional view, with parts removed for greater clarity, of a preferred embodiment of the pumping unit according to the present invention
  • Figure 2 is a second, schematic, cross-sectional view, with parts removed for greater clarity, of the pumping unit according to Figure 1; and Figure 3 is a perspective view of a first detail of the pumping unit according to Figures
  • 1 denotes in its entirety, a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine (not shown).
  • fuel preferably diesel fuel
  • the pumping unit 1 comprises a piston pump 2 for feeding the fuel to the internal combustion engine (not shown); and a pre-feed pump 3, for example a gear pump, for feeding the fuel from a storage tank (not shown) to said pump 2.
  • the pump 2 has a pump body 4 comprising a support housing 5 which is provided with a central hole 6 having a longitudinal axis 7 and also has a side hole 8, which has a longitudinal axis 9 transverse to the axis 7 and extends radially towards the outside of the housing 5 from said hole 6.
  • the hole 8 is closed by a head-piece 10 which is arranged in contact with the housing 5 and has a lug 11 projecting inside the hole 8 coaxially with the axis 9.
  • the head-piece 10 has a central hole 12 which is formed through the head-piece 10 coaxially with the axis 9 and comprises two portions 13a, 13b with widened ends and a narrower intermediate portion 14 formed between the said portions 13a, 13b.
  • the portion 14 defines a cylinder 15 slidably engaged by a piston 15 movable along the cylinder 15, as a result of the thrust of an actuating device 17, with an alternating rectilinear movement comprising an intake stroke for drawing the fuel into the cylinder
  • the device 17 comprises a tappet system 18 comprising, in turn, a substantially cylindrical support block 19 which has a cup-shaped form with its concavity situated opposite the hole 6, is slidably engaged inside the hole 8 coaxially with the axis 9 and extends around the cylinder 15.
  • the block 19 is bounded by an end wall 20 which has the form of a cylinder segment and is provided with a plurality of openings 21.
  • the block 19 also has two engaging forks 22 which project from the block 19 towards the hole 6, are arranged on opposite sides of the axis 9 and are each bounded by a respective, substantially flat, side wall 23 facing the wall 23 of the other fork 22.
  • the tappet system 18 further comprises a support pin 24 which is snap-engaged with the two forks 22 and has a longitudinal axis 25 substantially perpendicular to the axis 9 and the walls 23.
  • the roller 26 is bounded axially by two substantially flat, mutually parallel, end faces 27, each of which extends perpendicularly with respect to the axis 25 and faces the wall 23 of the corresponding fork 22.
  • the device 17 also comprises an annular disk 28 which extends around the piston 16, is inserted inside the block 19 and has an inner perimetral edge axially facing a head of the said piston 16.
  • the device 17 further comprises a compression spring 29 which is mounted between the lug 11 and the block 19 coaxially with the axis 9 and is arranged between the head-piece 10 and the disk 28 so as to displace, and normally keep, the disk 28 in contact with the wall 20 and the roller 26 in contact with a cam 28 formed on an outer surface of an intermediate portion of a transmission shaft 31 mounted through the hole 6 so as to rotate, relative to the housing 5, about the axis 7.
  • a compression spring 29 which is mounted between the lug 11 and the block 19 coaxially with the axis 9 and is arranged between the head-piece 10 and the disk 28 so as to displace, and normally keep, the disk 28 in contact with the wall 20 and the roller 26 in contact with a cam 28 formed on an outer surface of an intermediate portion of a transmission shaft 31 mounted through the hole 6 so as to rotate, relative to the housing 5, about the axis 7.
  • the shaft 31, the spring 29 and the tappet system 18 are housed inside a containing chamber 32 which is formed partly inside the hole 6 and partly inside the hole 8 and is connected to a device (not shown) for supplying lubricating oil.
  • the chamber 32 is separated in a fluid-tight manner from the cylinder 15 by means of annular seal 33 mounted in the portion 13b so as to prevent the fuel and the lubricating oil which seep between the lug 11 and the piston 16 from being mixed together.
  • the chamber 32 defines part of a lubrication circuit 34 further comprising a lubrication channel 35 which is formed through the wall 20 and extends parallel to the axis 25.
  • the channel 35 is configured to receive at its inlet the lubricating oil from a feed hole
  • the lubricating oil is fed through the hole 36 in a feeding direction (not shown) transverse to the axis 9 and parallel to the axis 25.
  • the circuit 34 also comprises two further lubrication channels 37 formed through the block 19 on opposite sides of the roller 26 along the axis 25.
  • Each channel 37 is connected to the channel 35 and has an outlet hole 38 which opens out on the wall 23 of the respective fork 22 and faces a corresponding end face
  • Each roller 37 is moreover inclined at an angle different from 90° with respect to the corresponding wall 23 and the corresponding face 27.
  • the head-piece 10 supports an intake valve 39 for drawing the fuel into the cylinder 15 and a delivery valve 40 for supplying the fuel to the internal combustion engine (not shown).
  • the pumping unit 1 offers a number of advantages mainly resulting from the fact that the formation of the lubrication channels 35, 37 is relatively simple and low-cost and the lubrication circuit 34 has a relatively small length and therefore relatively small pressure drops and ensures the correct lubrication of the tappet roller 26.

Abstract

A pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine, has a piston pump (2) provided with at least one piston (16) movable along a cylinder (15) by means of the thrust of a tappet system (18) arranged between the piston (16) and a transmission shaft (31); the tappet system (18) having a tappet roller(26) mounted inside a support block (19) provided with a lubrication channel (35) formed through the support block (19) parallel to an axis of rotation (25) of the said tappet roller (26).

Description

Description
Title
PUMPING UNIT FOR FEEDING FU EL, PREFERABLY DI ESEL FU EL, TO AN
INTERNAL COMBUSTION ENGINE
The present invention relates to a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine.
In particular the present invention relates to a pumping unit of the type comprising a high-pressure pump for feeding fuel to an internal combustion engine; and a low- pressure pump for feeding the fuel from a storage tank to the high-pressure pump.
The high-pressure pump is a piston pump comprising a pump body; at least one cylinder formed in the pump body; and a piston slidably engaged inside the said cylinder.
The pumping unit also comprises an actuating device for displacing the piston along the cylinder with an alternating rectilinear movement comprising an intake stroke for drawing fuel into the cylinder and a compression stroke for compressing the fuel contained inside said cylinder. The actuating device comprises a cam transmission shaft for displacing the piston with its compression stroke, a tappet system arranged between the piston and the cam transmission shaft, and a spring for displacing the piston with its intake stroke. The tappet system comprises a support block which has a cup-shaped form, is slidably engaged inside the pump body and is provided with two engaging forks projecting from the support block towards the cam transmission shaft.
The tappet system further comprises a tappet roller slidably engaged with a support pin locked by means of snap engagement inside the two engaging forks.
The tappet roller has a length smaller than the length of the support pin, extends between the two engaging forks and is axially bounded by two substantially flat end faces each facing a side wall of a respective engaging fork.
The cam transmission shaft, the tappet system and the spring are housed inside a containing chamber which is separated in a fluid-tight manner from the cylinder and is connected to a lubrication circuit designed to feed lubricating oil inside the said containing chamber.
The lubrication circuit comprises a first lubrication channel which is formed in an outer surface of the support block, has a T-shaped form and comprises, in turn, an inlet section parallel to a longitudinal axis of the cylinder and an outlet section extending around the said longitudinal axis. The lubrication circuit further comprises two second lubrication channels, each of which extends through the support block from a free end of the outlet section of the first lubrication channel and has an outlet hole facing a corresponding end face of the tappet roller.
The lubrication circuit furthermore extends through the pump body and is provided with a feed hole facing a free end of the inlet section of the first lubrication channel.
The pumping unit further comprises an intake valve for selectively controlling the feeding of the fuel into the cylinder; and a delivery valve for selectively controlling the feeding of the fuel to the internal combustion engine.
The pumping units of the type described above have a number of drawbacks mainly arising from the fact that the formation of the first lubrication channel on the outer surface of the support block is relatively complex and costly.
The known pumping units of the type described above have, moreover, the further drawback consisting in the fact that the first lubrication channel has a relatively long length, this resulting in relatively high pressure drops along the lubrication circuit and preventing correct lubrication of the tappet roller.
The object of the present invention is to provide a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine, which does not have the aforementioned drawbacks and is simple and inexpensive to produce. According to the present invention a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine is provided, as claimed in the accompanying claims. The present invention will now be described with reference to the accompanying drawings which illustrate a non-limiting example of embodiment thereof, in which:
Figure 1 is a first, schematic, cross-sectional view, with parts removed for greater clarity, of a preferred embodiment of the pumping unit according to the present invention;
Figure 2 is a second, schematic, cross-sectional view, with parts removed for greater clarity, of the pumping unit according to Figure 1; and Figure 3 is a perspective view of a first detail of the pumping unit according to Figures
1 and 2.
With reference to Figures 1 and 2, 1 denotes in its entirety, a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine (not shown).
The pumping unit 1 comprises a piston pump 2 for feeding the fuel to the internal combustion engine (not shown); and a pre-feed pump 3, for example a gear pump, for feeding the fuel from a storage tank (not shown) to said pump 2. The pump 2 has a pump body 4 comprising a support housing 5 which is provided with a central hole 6 having a longitudinal axis 7 and also has a side hole 8, which has a longitudinal axis 9 transverse to the axis 7 and extends radially towards the outside of the housing 5 from said hole 6.
The hole 8 is closed by a head-piece 10 which is arranged in contact with the housing 5 and has a lug 11 projecting inside the hole 8 coaxially with the axis 9.
The head-piece 10 has a central hole 12 which is formed through the head-piece 10 coaxially with the axis 9 and comprises two portions 13a, 13b with widened ends and a narrower intermediate portion 14 formed between the said portions 13a, 13b.
The portion 14 defines a cylinder 15 slidably engaged by a piston 15 movable along the cylinder 15, as a result of the thrust of an actuating device 17, with an alternating rectilinear movement comprising an intake stroke for drawing the fuel into the cylinder
15 and a compression stroke for compressing the fuel contained inside said cylinder 15.
In accordance with that shown in Figures 1, 2, 3 and 4, the device 17 comprises a tappet system 18 comprising, in turn, a substantially cylindrical support block 19 which has a cup-shaped form with its concavity situated opposite the hole 6, is slidably engaged inside the hole 8 coaxially with the axis 9 and extends around the cylinder 15.
The block 19 is bounded by an end wall 20 which has the form of a cylinder segment and is provided with a plurality of openings 21. The block 19 also has two engaging forks 22 which project from the block 19 towards the hole 6, are arranged on opposite sides of the axis 9 and are each bounded by a respective, substantially flat, side wall 23 facing the wall 23 of the other fork 22.
The tappet system 18 further comprises a support pin 24 which is snap-engaged with the two forks 22 and has a longitudinal axis 25 substantially perpendicular to the axis 9 and the walls 23. The tappet system 18, finally, comprises a tappet roller 26 which is rotatably mounted on the pin 24 so as to rotate about the axis 25, has a length smaller than the length of the pin 24 and extends between the two forks 22.
The roller 26 is bounded axially by two substantially flat, mutually parallel, end faces 27, each of which extends perpendicularly with respect to the axis 25 and faces the wall 23 of the corresponding fork 22.
The device 17 also comprises an annular disk 28 which extends around the piston 16, is inserted inside the block 19 and has an inner perimetral edge axially facing a head of the said piston 16.
The device 17 further comprises a compression spring 29 which is mounted between the lug 11 and the block 19 coaxially with the axis 9 and is arranged between the head-piece 10 and the disk 28 so as to displace, and normally keep, the disk 28 in contact with the wall 20 and the roller 26 in contact with a cam 28 formed on an outer surface of an intermediate portion of a transmission shaft 31 mounted through the hole 6 so as to rotate, relative to the housing 5, about the axis 7.
The shaft 31, the spring 29 and the tappet system 18 are housed inside a containing chamber 32 which is formed partly inside the hole 6 and partly inside the hole 8 and is connected to a device (not shown) for supplying lubricating oil.
The chamber 32 is separated in a fluid-tight manner from the cylinder 15 by means of annular seal 33 mounted in the portion 13b so as to prevent the fuel and the lubricating oil which seep between the lug 11 and the piston 16 from being mixed together.
The chamber 32 defines part of a lubrication circuit 34 further comprising a lubrication channel 35 which is formed through the wall 20 and extends parallel to the axis 25. The channel 35 is configured to receive at its inlet the lubricating oil from a feed hole
36 formed through the housing 5. The lubricating oil is fed through the hole 36 in a feeding direction (not shown) transverse to the axis 9 and parallel to the axis 25.
The circuit 34 also comprises two further lubrication channels 37 formed through the block 19 on opposite sides of the roller 26 along the axis 25.
Each channel 37 is connected to the channel 35 and has an outlet hole 38 which opens out on the wall 23 of the respective fork 22 and faces a corresponding end face
Figure imgf000008_0001
Each roller 37 is moreover inclined at an angle different from 90° with respect to the corresponding wall 23 and the corresponding face 27.
Finally, the head-piece 10 supports an intake valve 39 for drawing the fuel into the cylinder 15 and a delivery valve 40 for supplying the fuel to the internal combustion engine (not shown).
The pumping unit 1 offers a number of advantages mainly resulting from the fact that the formation of the lubrication channels 35, 37 is relatively simple and low-cost and the lubrication circuit 34 has a relatively small length and therefore relatively small pressure drops and ensures the correct lubrication of the tappet roller 26.

Claims

Claims
1.- Pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine, the pumping unit comprising a piston pump (2) for feeding the fuel to the internal combustion engine; a pre-feed pump (3) for feeding the fuel from a storage tank to the piston pump (2); the piston pump (2) comprising, in turn, a pump body (4); at least one cylinder (15) formed in the pump body (4); a piston (16) slidably engaged inside the cylinder (15); and an actuating device (17) for displacing the piston (16) with an intake stroke for drawing the fuel into the cylinder (15) and with a compression stroke for compressing the fuel contained inside said cylinder (15); the actuating device (17) comprising a transmission shaft (31) mounted so as to rotate about a first axis of rotation (7) and, for each piston (16), a respective tappet system (18) arranged between the transmission shaft (31) and the said piston (16); the tappet system (18) comprising a support block (19) slidably engaged inside the pump body (4), a tappet roller (26) slidably engaged with the support block (19) so as to rotate about a second axis of rotation (25) substantially parallel to the first axis of rotation (7), and a lubrication circuit (34) for lubricating the said tappet system (18); and being characterized in that the lubrication circuit (34) comprises a first lubrication channel (35) which extends through the support block (19) parallel to the second axis of rotation (25).
2.- Pumping unit according to Claim 1, wherein the support block (19) has a cup shaped form and is bounded by an end wall (20) facing the tappet roller (26); the first lubrication channel (35) being formed through the end wall (20).
3.- Pumping unit according to Claim 1 or 2, wherein the support block (19) comprises two engaging elements (22) for engagement with the tappet roller (26), which are arranged axially on opposite sides of the said tappet roller (26).
4.- Pumping unit according to Claim 3, wherein each engaging element (22) has a fork-like form; the tappet system (18) further comprising a support pin (24) which extends through the tappet roller (26) coaxially with the second axis of rotation (25), has two free ends projecting axially from the tappet roller (26) and is locked by means of snap-engagement inside the engaging elements (22).
5.- Pumping unit according to any one of the preceding claims, wherein the tappet roller (26) is bounded axially by two end faces (27) which are substantially flat and perpendicular to the second axis of rotation (25); the lubrication circuit (34) further comprising two second lubrication channels (37) which are formed through the support block (19) on opposite sides of the tappet roller (26), are connected to the first lubrication channel (35) and each have a respective outlet hole (38) facing a corresponding end face (27).
6.- Pumping unit according to Claim 5, wherein each second lubrication channel (37) is inclined at an angle different from 90° with respect to the corresponding end face (27) of the tappet roller (26).
7.- Pumping unit according to any one of the preceding claims, wherein the pump body (4) has, for each tappet system (18), a respective feed hole (36), which is connected to the lubricant supply device, faces the first lubrication channel (35) and is directed so as to feed the fuel into the first lubrication channel (35) in a feeding direction transverse to a longitudinal axis (9) of the corresponding cylinder (15).
PCT/EP2019/073547 2018-10-15 2019-09-04 Pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine WO2020078612A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102018000009454 2018-10-15
IT102018000009454A IT201800009454A1 (en) 2018-10-15 2018-10-15 PUMPING GROUP TO FEED FUEL, PREFERABLY DIESEL, TO AN INTERNAL COMBUSTION ENGINE

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4228854A1 (en) * 1992-08-29 1994-03-03 Kloeckner Humboldt Deutz Ag Rolling tappet for driving injection pumps in diesel engines - has oil passing from oil bore through radial throttle bore into inner chamber of tappet body for effective lubrication.
DE102010030498A1 (en) * 2010-06-24 2011-12-29 Robert Bosch Gmbh Pump, in particular high-pressure fuel pump
US20150004012A1 (en) * 2013-06-26 2015-01-01 Hyundai Motor Company Lubrication apparatus of high pressure pump for common rail system
GB2548900A (en) * 2016-04-01 2017-10-04 Delphi Int Operations Luxembourg Sarl Tappet, high pressure pump comprising at least one tappet, engine comprising at least one tappet, engine comprising a high pressure pump having at least one
DE102016218909A1 (en) * 2016-09-29 2018-03-29 Robert Bosch Gmbh Roller tappet for a piston pump, piston pump

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4228854A1 (en) * 1992-08-29 1994-03-03 Kloeckner Humboldt Deutz Ag Rolling tappet for driving injection pumps in diesel engines - has oil passing from oil bore through radial throttle bore into inner chamber of tappet body for effective lubrication.
DE102010030498A1 (en) * 2010-06-24 2011-12-29 Robert Bosch Gmbh Pump, in particular high-pressure fuel pump
US20150004012A1 (en) * 2013-06-26 2015-01-01 Hyundai Motor Company Lubrication apparatus of high pressure pump for common rail system
GB2548900A (en) * 2016-04-01 2017-10-04 Delphi Int Operations Luxembourg Sarl Tappet, high pressure pump comprising at least one tappet, engine comprising at least one tappet, engine comprising a high pressure pump having at least one
DE102016218909A1 (en) * 2016-09-29 2018-03-29 Robert Bosch Gmbh Roller tappet for a piston pump, piston pump

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