WO2012163576A1 - Pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine - Google Patents
Pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine Download PDFInfo
- Publication number
- WO2012163576A1 WO2012163576A1 PCT/EP2012/056068 EP2012056068W WO2012163576A1 WO 2012163576 A1 WO2012163576 A1 WO 2012163576A1 EP 2012056068 W EP2012056068 W EP 2012056068W WO 2012163576 A1 WO2012163576 A1 WO 2012163576A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- annular element
- pump unit
- unit according
- piston
- cylinder
- Prior art date
Links
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
- 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
- F02M59/445—Selection of particular materials
-
- 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
Definitions
- the present invention relates to a pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine.
- the present invention relates to a pump unit of the type comprising a pump housing, at least one cylinder formed in the pump housing; a piston which is engaged slidably in the cylinder and has a narrower portion and a wider portion interconnected at a shoulder which is positioned perpendicularly to a longitudinal axis of the cylinder; first actuator means for moving the piston through a stroke for the intake of fuel into the cylinder; and second actuator means for moving the piston through a stroke for the compression of the fuel contained in the cylinder.
- the second actuator means comprise a cam, formed on an outer surface of a transmission shaft extending through the pump housing transversely with respect to the longitudinal axis of the cylinder, and a cam follower, which is positioned between the cam and the wider portion of the piston and which is provided with a cam follower roller positioned in contact with the cam.
- the cam follower roller projects from a sleeve which extends around the cylinder, is coupled slidably to the pump housing, and has a flange projecting radially inwards from the sleeve so as to separate a first portion of the sleeve, adapted to receive and retain the cam follower by a positive fit, from a second portion.
- the first actuator means comprise an annular support element, which is fitted into the second portion of the sleeve, extends around the narrower portion of the piston, and axially faces the flange of the sleeve and the shoulder of the piston, and a cylindrical spring, which is mounted between the cylinder and the sleeve coaxi- ally with the longitudinal axis of the cylinder, and is interposed between the pump housing and the annular support element so as to hold the annular support element axially against the flange and hold the cam follower against the cam.
- the wider portion of the piston normally has an axial length which is smaller than the distance between the annular support element and the cam follower, the inertial forces acting on the piston cause the piston to move axially with respect to both the annular support element and the cam follower, and cause the piston to strike against the cam follower at the end of the intake stroke and against the annular support element at the end of the compression stroke.
- the known pump units of the type described above have a number of drawbacks, mainly due to the fact that the striking of the piston against the annular support element and against the cam follower gives rise to troublesome noise and also causes the deformation of the annular support element, which is detrimental to its correct operation.
- the object of the present invention is to provide a pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine which is free of the drawbacks described above and which is simple and economical to produce.
- a pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine, as claimed in the appended claims.
- Figure 1 is a first schematic sectional view, with parts removed for clarity, of a preferred embodiment of the pump unit according to the present invention
- Figure 2 is a second schematic sectional view, with parts removed for clarity, of the pump unit of Figure 1;
- Figure 3 is a schematic sectional view of a detail of Figures 1 and 2.
- the number 1 indicates, as a whole, a pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine (not shown).
- fuel preferably diesel oil
- the pump unit 1 comprises a pump housing 2 provided with a central bore 3 having a specified longitudinal axis 4; a piston pump 5 for supplying the fuel to the aforesaid internal combustion engine (not shown); and a pre-feed pump of a known type (not shown) for supplying the fuel to the pump 5.
- the pump 5 comprises at least one cylinder 6, which is formed in the pump housing 2, has a longitudinal axis 7 positioned substantially perpendicularly to the axis 4, faces the bore 3, and interacts with a valve 8 for the intake of fuel into the cylinder 6 and with a valve 9 for delivering the fuel to the internal combustion engine (not shown).
- the cylinder 6 is engaged slidably by a piston 10, which is mounted inside the cylinder 6 coaxially with the axis 7, and comprises a wider end portion 11 and a narrower intermediate portion 12, these portions being interconnected at an annular shoulder 13 which is substantially perpendicular and coaxial with the axis 7.
- the piston 10 is moved by an actuating device 14 along the cylinder 6 with a reciprocating rectilinear motion including a stroke for the intake of fuel into the cylinder 6 and a stroke for the compression of the fuel contained in the cylinder 6.
- the device 14 comprises a tubular sleeve 15, which is engaged slidably in a cylinder 16 formed in the pump housing 2 coaxially with the axis 7, extends around the cylinder 6, and has an annular flange 17 which projects radially into the sleeve 15 and divides the sleeve 15 into two cylindrical portions 18, 19, of which the portion 18 faces the bore 3.
- the device 14 also has a cam follower 20 comprising a coupling block 21 of substantially cylindrical shape, which is fitted inside the portion 18, is positioned in contact with the flange 17, and is locked by interference in the portion 18, and a cam follower roller 22 which projects from the block 21 towards the bore 3 and is coupled rotatably to the block 21 so that it can rotate with respect to the block 21 about its own longitudinal axis 23 which is substantially perpendicular to the axis 7.
- the flange 17 supports an annular element 24, which extends around the narrower portion 12 of the piston 10, is fitted into the portion 19 of the sleeve 15 coaxially with the axis 7, has an outer perimetric edge facing the flange 17 axially, also has an inner perimetric edge facing the shoulder 13 axially, and is limited axially by two flat faces 25, 26 which are substantially parallel to each other and perpendicular to the axis 7, with the face 25 facing the cam follower 20.
- Each face 25, 26 has, on its inner perimetric edge, an annular coating 27, 28, which is substantially coaxial with the axis 7 and which is preferably, but not necessarily, made from a resiliently deformable material, in the present case an elas- tomeric material deposited by curing on the face 25, 26.
- the device 14 comprises a cylindrical spring 29, which is mounted between the cylinder 6 and the sleeve 15 coaxially with the axis 7, and is interposed between the pump housing 2 and the element 24 in such a way that it brings the element 24 into contact with the flange 17 and normally keeps it there, brings the coating 27 of the face 25 into contact with the shoulder 13 and normally keeps it there, brings the piston 10 into contact with the block 21 and normally keeps it there, and brings the roller 22 into contact with a cam 30 and normally keeps it there, the cam 30 being formed on an outer surface of an intermediate portion of a transmission shaft 31 which is mounted through the bore 3 so as to rotate, with respect to the pump housing 2, about the axis 4.
- the thickness of the coating 27, measured parallel to the axis 7, is at least equal to the difference between the distance of the face 25 from the block 21 and the thickness of the wider portion 11 of the piston 10, also measured parallel to the axis 7, the coating 27 prevents the portion 11 from striking the block 21 and the element 24, and from deforming the element 24 to the detriment of its correct operation.
- the presence of the two coatings 27, 28 enables the personnel responsible for assembling the pump unit 1 to fit the element 24 correctly in the portion 19 of the sleeve 15, regardless of the position of the faces 25, 26.
- the coatings 27, 28 can extend continuously around the inner perimetric edges of the corresponding faces 25, 26, or can comprise a plurality of portions of elastomeric material distributed around the inner perimetric edges of the corresponding faces 25, 26 so as to form, in combination, an annular element for filling the space present between the shoulder 13 and the element 24.
- the coatings 27, 28 are dispensed with and replaced with a ring, preferably a ring of elastomeric material, which is interposed between the shoulder 13 and the element 24, is made as a separate piece distinct from the element 24, and is axially locked between the shoulder 13 and the element 24 by the spring 29.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
A pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine has a piston (10), which is engaged slidably in a cylinder (6) formed in a pump housing (2), is moved through a stroke for the intake of fuel into the cylinder (6) by a first annular element (24) extending around a narrower portion (12) of the piston (10), and is positioned in contact with a shoulder (13) of the piston (10) by means of the interposition of a second annular element (27).
Description
Description
Title
PUMP UNIT FOR SUPPLYING FU EL, PREFERABLY DI ESEL OIL, TO AN INTERNAL COMBUSTION ENGIN E
The present invention relates to a pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine.
More specifically, the present invention relates to a pump unit of the type comprising a pump housing, at least one cylinder formed in the pump housing; a piston which is engaged slidably in the cylinder and has a narrower portion and a wider portion interconnected at a shoulder which is positioned perpendicularly to a longitudinal axis of the cylinder; first actuator means for moving the piston through a stroke for the intake of fuel into the cylinder; and second actuator means for moving the piston through a stroke for the compression of the fuel contained in the cylinder.
The second actuator means comprise a cam, formed on an outer surface of a transmission shaft extending through the pump housing transversely with respect to the longitudinal axis of the cylinder, and a cam follower, which is positioned between the cam and the wider portion of the piston and which is provided with a cam follower roller positioned in contact with the cam.
The cam follower roller projects from a sleeve which extends around the cylinder, is coupled slidably to the pump housing, and has a flange projecting radially inwards from the sleeve so as to separate a first portion of the sleeve, adapted to receive and retain the cam follower by a positive fit, from a second portion.
The first actuator means comprise an annular support element, which is fitted into the second portion of the sleeve, extends around the narrower portion of the piston, and axially faces the flange of the sleeve and the shoulder of the piston, and a cylindrical spring, which is mounted between the cylinder and the sleeve coaxi- ally with the longitudinal axis of the cylinder, and is interposed between the pump housing and the annular support element so as to hold the annular support element axially against the flange and hold the cam follower against the cam.
Since the wider portion of the piston normally has an axial length which is smaller than the distance between the annular support element and the cam follower, the inertial forces acting on the piston cause the piston to move axially with respect to both the annular support element and the cam follower, and cause the piston to strike against the cam follower at the end of the intake stroke and against the annular support element at the end of the compression stroke.
The known pump units of the type described above have a number of drawbacks, mainly due to the fact that the striking of the piston against the annular support element and against the cam follower gives rise to troublesome noise and also causes the deformation of the annular support element, which is detrimental to its correct operation.
The object of the present invention is to provide a pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine which is free of the drawbacks described above and which is simple and economical to produce.
According to the present invention, a pump unit is provided for supplying fuel, preferably diesel oil, to an internal combustion engine, as claimed in the appended claims.
The present invention will now be described with reference to the attached drawings, which show a non-limiting example of its embodiment, in which:
Figure 1 is a first schematic sectional view, with parts removed for clarity, of a preferred embodiment of the pump unit according to the present invention;
Figure 2 is a second schematic sectional view, with parts removed for clarity, of the pump unit of Figure 1; and
Figure 3 is a schematic sectional view of a detail of Figures 1 and 2.
With reference to Figures 1 and 2, the number 1 indicates, as a whole, a pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine (not shown).
The pump unit 1 comprises a pump housing 2 provided with a central bore 3 having a specified longitudinal axis 4; a piston pump 5 for supplying the fuel to the aforesaid internal combustion engine (not shown); and a pre-feed pump of a known type (not shown) for supplying the fuel to the pump 5.
The pump 5 comprises at least one cylinder 6, which is formed in the pump housing 2, has a longitudinal axis 7 positioned substantially perpendicularly to the axis 4, faces the bore 3, and interacts with a valve 8 for the intake of fuel into the cylinder 6 and with a valve 9 for delivering the fuel to the internal combustion engine (not shown).
The cylinder 6 is engaged slidably by a piston 10, which is mounted inside the cylinder 6 coaxially with the axis 7, and comprises a wider end portion 11 and a narrower intermediate portion 12, these portions being interconnected at an annular shoulder 13 which is substantially perpendicular and coaxial with the axis 7.
The piston 10 is moved by an actuating device 14 along the cylinder 6 with a reciprocating rectilinear motion including a stroke for the intake of fuel into the cylinder 6 and a stroke for the compression of the fuel contained in the cylinder 6.
The device 14 comprises a tubular sleeve 15, which is engaged slidably in a cylinder 16 formed in the pump housing 2 coaxially with the axis 7, extends around the cylinder 6, and has an annular flange 17 which projects radially into the
sleeve 15 and divides the sleeve 15 into two cylindrical portions 18, 19, of which the portion 18 faces the bore 3.
The device 14 also has a cam follower 20 comprising a coupling block 21 of substantially cylindrical shape, which is fitted inside the portion 18, is positioned in contact with the flange 17, and is locked by interference in the portion 18, and a cam follower roller 22 which projects from the block 21 towards the bore 3 and is coupled rotatably to the block 21 so that it can rotate with respect to the block 21 about its own longitudinal axis 23 which is substantially perpendicular to the axis 7.
As illustrated in Figure 3, the flange 17 supports an annular element 24, which extends around the narrower portion 12 of the piston 10, is fitted into the portion 19 of the sleeve 15 coaxially with the axis 7, has an outer perimetric edge facing the flange 17 axially, also has an inner perimetric edge facing the shoulder 13 axially, and is limited axially by two flat faces 25, 26 which are substantially parallel to each other and perpendicular to the axis 7, with the face 25 facing the cam follower 20.
Each face 25, 26 has, on its inner perimetric edge, an annular coating 27, 28, which is substantially coaxial with the axis 7 and which is preferably, but not necessarily, made from a resiliently deformable material, in the present case an elas- tomeric material deposited by curing on the face 25, 26.
Finally, the device 14 comprises a cylindrical spring 29, which is mounted between the cylinder 6 and the sleeve 15 coaxially with the axis 7, and is interposed between the pump housing 2 and the element 24 in such a way that it brings the element 24 into contact with the flange 17 and normally keeps it there, brings the coating 27 of the face 25 into contact with the shoulder 13 and normally keeps it there, brings the piston 10 into contact with the block 21 and normally keeps it there, and brings the roller 22 into contact with a cam 30 and normally keeps it there, the cam 30 being formed on an outer surface of an intermediate portion of a transmission shaft 31 which is mounted through the bore 3 so as to rotate, with respect to the pump housing 2, about the axis 4.
Since the thickness of the coating 27, measured parallel to the axis 7, is at least equal to the difference between the distance of the face 25 from the block 21 and the thickness of the wider portion 11 of the piston 10, also measured parallel to the axis 7, the coating 27 prevents the portion 11 from striking the block 21 and the element 24, and from deforming the element 24 to the detriment of its correct operation.
The presence of the two coatings 27, 28 enables the personnel responsible for assembling the pump unit 1 to fit the element 24 correctly in the portion 19 of the sleeve 15, regardless of the position of the faces 25, 26.
Clearly, the coatings 27, 28 can extend continuously around the inner perimetric edges of the corresponding faces 25, 26, or can comprise a plurality of portions of elastomeric material distributed around the inner perimetric edges of the corresponding faces 25, 26 so as to form, in combination, an annular element for filling the space present between the shoulder 13 and the element 24.
In a variant which is not illustrated, the coatings 27, 28 are dispensed with and replaced with a ring, preferably a ring of elastomeric material, which is interposed between the shoulder 13 and the element 24, is made as a separate piece distinct from the element 24, and is axially locked between the shoulder 13 and the element 24 by the spring 29.
Claims
1. Pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine, the pump unit comprising a pump housing (2); at least one cylinder (6), which is formed in the pump housing (2), and has a first longitudinal axis (7); a piston (10), which is engaged slidably in the cylinder (6), and has a narrower portion (12), a wider portion (11), and a shoulder (13) for connecting the narrower portion (12) and the wider portion (11) to each other; first actuator means (24, 29) for moving the piston (10) through a stroke for the intake of fuel into the cylinder (6); and second actuator means (20, 30) for moving the piston (10) through a stroke for the compression of the fuel contained in the cylinder (6), the first actuator means (24, 29) comprising a first annular element (24) extending around the narrower portion (12), the pump unit being characterized in that it further comprises a second annular element (27), which is interposed between the shoulder (13) and the first annular element (24), extends around the narrower portion (12), and is positioned in axial contact with the shoulder (13) and with the first annular element (24).
2. Pump unit according to Claim 1, in which the second annular element (27) is fixed to the first annular element (24).
3. Pump unit according to Claim 1 or 2, in which the second annular element (27) is made from a resiliently deformable material.
4. Pump unit according to Claim 3, in which the second annular element (27) is made from an elastomeric material deposited by curing on the first annular element (24).
5. Pump unit according to any one of the preceding claims and further comprising a third annular element (28) fixed to the first annular element (24) on the opposite side from the second annular element (27).
6. Pump unit according to Claim 5, in which the second and third annular elements (27, 28) are made from the same material.
7. Pump unit according to any one of the preceding claims, in which the first actuator means (24, 29) further comprise a spring (29) interposed between the pump housing (2) and the first annular element (24) to keep the second annular element (27) in contact with the shoulder (13).
8. Pump unit according to Claim 7, further comprising a sleeve (15) which extends around the piston (10) coaxially with the first axis (7), is coupled slidably to the pump housing (2), and is coupled in an axially fixed way to the first annular element (24).
9. Pump unit according to Claim 8, in which the sleeve (15) has a flange (17) projecting radially into the sleeve (15); the spring (29) being mounted inside the sleeve (15) so as to bring the first annular element (24) into contact with the flange (17) and normally keep it there.
10. Pump unit according to any one of the preceding claims, in which the second actuator means (20, 30) comprise a cam (30), mounted so as to rotate about a second axis (4) which is transverse with respect to the first axis (7), and a cam follower (20), which is engaged in the cam (30) and is positioned in contact with the piston (10).
11. Pump unit according to Claim 10, when dependent on Claim 8 or 9, in which the sleeve (15) and the cam follower (20) are coupled to each other in an axially fixed way.
12. Pump unit according to Claim 10 or 11, in which the thickness of the second annular element (27), measured parallel to the first axis (7), is at least equal to the difference between the distance of the cam follower (20) from the first annular element (24) and the thickness of the wider portion (11) of the piston (10), also measured parallel to the first axis (7).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI2011A000976 | 2011-05-30 | ||
| IT000976A ITMI20110976A1 (en) | 2011-05-30 | 2011-05-30 | PUMPING GROUP FOR FUEL SUPPLEMENTATION, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2012163576A1 true WO2012163576A1 (en) | 2012-12-06 |
Family
ID=44898729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2012/056068 WO2012163576A1 (en) | 2011-05-30 | 2012-04-03 | Pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine |
Country Status (2)
| Country | Link |
|---|---|
| IT (1) | ITMI20110976A1 (en) |
| WO (1) | WO2012163576A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITMI20130500A1 (en) * | 2013-04-02 | 2014-10-03 | Bosch Gmbh Robert | PUMPING GROUP FOR FUEL SUPPLEMENTATION, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE |
| ITMI20131164A1 (en) * | 2013-07-10 | 2015-01-11 | Bosch Gmbh Robert | PUMP ASSEMBLY TO SUPPLY FUEL, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE |
| IT201600115346A1 (en) * | 2016-11-15 | 2018-05-15 | Bosch Gmbh Robert | PUMPING GROUP FOR FUEL SUPPLEMENTATION, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0851120A2 (en) * | 1996-12-23 | 1998-07-01 | ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni | Piston pump, in particular a radial-piston pump for internal combustion engine fuel |
| EP1519033A2 (en) * | 2003-09-25 | 2005-03-30 | Robert Bosch Gmbh | Piston pump, particularly high pressure piston pump |
| DE102009027689A1 (en) * | 2009-07-14 | 2011-01-20 | Robert Bosch Gmbh | Fuel high-pressure pump for fuel injection system of internal-combustion engine of motor vehicle, has slots extending from central through-hole of spring disk, which is supported at guided piston in axial direction |
-
2011
- 2011-05-30 IT IT000976A patent/ITMI20110976A1/en unknown
-
2012
- 2012-04-03 WO PCT/EP2012/056068 patent/WO2012163576A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0851120A2 (en) * | 1996-12-23 | 1998-07-01 | ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni | Piston pump, in particular a radial-piston pump for internal combustion engine fuel |
| EP1519033A2 (en) * | 2003-09-25 | 2005-03-30 | Robert Bosch Gmbh | Piston pump, particularly high pressure piston pump |
| DE102009027689A1 (en) * | 2009-07-14 | 2011-01-20 | Robert Bosch Gmbh | Fuel high-pressure pump for fuel injection system of internal-combustion engine of motor vehicle, has slots extending from central through-hole of spring disk, which is supported at guided piston in axial direction |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITMI20130500A1 (en) * | 2013-04-02 | 2014-10-03 | Bosch Gmbh Robert | PUMPING GROUP FOR FUEL SUPPLEMENTATION, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE |
| ITMI20131164A1 (en) * | 2013-07-10 | 2015-01-11 | Bosch Gmbh Robert | PUMP ASSEMBLY TO SUPPLY FUEL, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE |
| WO2015004151A1 (en) * | 2013-07-10 | 2015-01-15 | Robert Bosch Gmbh | Internal combustion engine fuel, preferably diesel fuel, feed pump assembly |
| US10352283B2 (en) | 2013-07-10 | 2019-07-16 | Robert Bosch Gmbh | Internal combustion engine fuel, preferably diesel fuel, feed pump assembly |
| IT201600115346A1 (en) * | 2016-11-15 | 2018-05-15 | Bosch Gmbh Robert | PUMPING GROUP FOR FUEL SUPPLEMENTATION, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE |
Also Published As
| Publication number | Publication date |
|---|---|
| ITMI20110976A1 (en) | 2012-12-01 |
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