GB2570290A - Fuel pump - Google Patents
Fuel pump Download PDFInfo
- Publication number
- GB2570290A GB2570290A GB1800346.7A GB201800346A GB2570290A GB 2570290 A GB2570290 A GB 2570290A GB 201800346 A GB201800346 A GB 201800346A GB 2570290 A GB2570290 A GB 2570290A
- Authority
- GB
- United Kingdom
- Prior art keywords
- turret
- plunger
- bucket
- face
- spring seat
- 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.)
- Granted
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
- F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
-
- 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
-
- 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
- F04B1/0408—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
- F04B1/0404—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
- F04B1/0443—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
- F04B1/053—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
- F04B53/04—Draining
-
- 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
-
- 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
- F04B9/042—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 cams
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
High pressure fuel pump 10 having a body 12 provided with a bore 22 coaxial to a turret 18 and a plunger 26, a spring seat member 30 fixed to the plunger 26, and a spring 36, wherein said spring seat member 30 defines a bucket adapted to collect fuel leaking between the plunger and the bore. This arrangement allows for a clearance between the plunger 26 and bore 22 such that the chance of seizure is reduced, while minimising pressure loss due to leakage.
Description
TECHNICAL FIELD
The present invention relates to a diesel fuel pump and particularly to an arrangement tending to limit the fuel leaks.
BACKGROUND OF THE INVENTION
The hydraulic performance of diesel fuel injection pumps that have a plunger reciprocating in a bore in a pumping head relies on a close clearance between the plunger and the bore to minimise the fuel leakage. This leakage constitutes the largest hydraulic loss and reduction in performance at high pressures.
A simple method of improving the performance of a pump is to reduce this clearance, however, as the clearance gets smaller the likelihood of the plunger seizing in the bore increases. As a consequence of the leakage and associated pressure drop along the clearance heat is released.
As the pressures get higher and higher so the pressure drops and leakage flows also increase leading to more and more heat release.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to resolve the above mentioned problems in providing a high pressure fuel pump of a diesel injection system having a body with a main member from a face of which a turret protrudes and extends along a main axis toward a distant end face. Said body is provided with a bore coaxial to the turret and extending between an opening in said turret end face and an inner end partially defining a compression chamber.
The pump further comprises
- a plunger guided in said bore for reciprocating between BDC and TDC. The plunger extends between an upper end also partially defining said compression chamber and a lower end protruding outside said bore opening and extending along said main axis.
- a spring seat member fixed to said part of the plunger that extends outside the bore and with,
- a spring arranged around the turret and compressed between the spring seat integral to the spring seat member and the face of the pump body main member.
Said spring seat member comprises a disc-like base which annular peripheral area defines said spring seat and which central area defines the bottom of a bucket adapted to collect, in use, fuel leaking between the plunger and the bore, said bucket comprising a cylindrical peripheral wall upwardly extending from said base and upwardly extending toward a distant edge.
Said peripheral wall defines with the turret an annular clearance enabling, in use, fuel present in the bucket to exit the bucket by flowing through said clearance wetting the peripheral face to the turret.
Said clearance may be about 1 mm to the radius.
Between the base and the distant edge said peripheral wall may axially extends along a height a little superior to the travel distance of the plunger between TDC and BDC.
When in BDC, the edge of the bucket peripheral wall just surrounds the distant end face of the turret and where, in TDC, the bucket is pulled-up by the plunger and the peripheral wall of the bucket surrounds the end of the turret which distant end face is close to the bottom of the bucket.
The peripheral wall may be integral to the base, the spring seat member being a monobloc part.
In another alternative, the peripheral wall is a tubular sleeve fixed to the base.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is now described by way of example with reference to the accompanying drawings in which:
Figure 1 is an axial section of a pump as per the invention, the plunger of the pump being in BDC.
Figure 2 is similar to figure 1, the plunger being in TDC.
Figure 3 is a view magnified on a spring seat member of the pump of figure 1.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In reference to the figures is described a diesel pumping head 10 comprising a body 12 that has a main member 14 from an under face 16 of which a turret 18 extends along a main axis A toward a distant end face 20. Said body 12 is further provided with a bore 22 extending along said main axis A between an upper blind end partially defining a compression chamber 24 and a lower end centrally opening in said turret end face 20.
In the compression chamber 24 open a controlled inlet and a controlled outlet and, in the bore 22 a plunger 26 is guided, having an upper end also partially defining said compression chamber 24 and a lower end portion protruding from said bore opening and extending along said main axis A toward a lower end 28. In use, said lower end 28 cooperates with a camshaft, not shown, that rotates and imparts to the plunger 26 reciprocal displacements between BDC, as shown on figure 2, and TDC, as shown on figure 3.
Moreover, a spring seat member 30 is fixed at said lower end 28 of the plunger, said spring seat member 30 having a disc-like base 32 centrally holed for the plunger to extend through and which outer peripheral area defines a spring seat 34, a spring 36 engaged around the turret 18 being compressed between said spring seat 34 and the under face 16 of the body main member so that the spring 36 imparts a force pulling the plunger 26 toward BDC.
The spring seat member 30 further comprises a cylindrical wall 38 upwardly extending from the base 32 toward a distant circular end 40. In a first embodiment presented on figure 2, said wall is an independent sleeve 42 fixed to the base 32. In a second embodiment shown on figures 1 and 3 the spring seat member 30 is made monobloc, said wall 38 being integral to the base 32.
Whichever the embodiment, the spring seat member 30 has a cup-like shape defining a bucket B surrounded by the wall 38, said bucket having a cylindrical inner space S through which axially extends the plunger, the spring seat 34 forming a collar outside said wall 38.
The turret 18 has a diameter DI8 slightly smaller than the inner diameter D38 of the peripheral wall defining between them a small annular clearance C.
C = D38 - D18. Typically, said clearance is about 1mm to the radius.
Moreover, the height H38 of the wall, between the base 32 and the distant circular edge 40 is just slightly superior to the plunger travel distance between BDC and TDC.
As shown on figure 2, when the plunger is in BDC, the base member 32 is at a distance from the turret end face 20 which is just engaged within the peripheral wall 38. The bucket inner space S is maximised, the turret not moving and the plunger being at BDC. The space S is almost closed by the turret which slightly engages in said wall 38 leaving between them the annular opening of said clearance C. In use, fuel leaking between the plunger 26 and the bore 22 exits the bore and is collected in the bucket B.
As the plunger 26 moves from BDC to TDC the turret 18 further engages in the bucket, reducing said inner space S, the fuel therein collected exiting the bucket B via said annular clearance C as shown by the arrows of figure 3.
When reaching TDC, figure 3, the inner space S is almost fully occupied by the turret 18 that has engaged in the wall 38, the turret end face 20 being very close to the base 32.
A major advantage of this spring seat member defining a bucket is that when the fuel exits the bucket and wets the turret, the heat loss to the surroundings from the pumping head is reduced. This has the effect of stabilising the temperature difference between the plunger and the head and thus preventing a thermal imbalance between the two components.
LIST OF REFERENCES
A main axis
TDC Top Dead Center position
BDC Bottom Dead Center position
B bucket
S inner space
D18 diameter of the turret
D38 diameter of the wall
H38 height of the wall
C clearance pump body main member under face turret end face bore compression chamber plunger lower end of the piston spring seat member disc-like base spring seat spring peripheral wall distant edge sleeve
Claims (7)
1. High pressure fuel pump (10) of a diesel injection system having a body (12) with a main member (14) from a face (16) of which a turret (18) protrudes and extends along a main axis (A) toward a distant end face (20), said body (12) being provided with a bore (22) coaxial to the turret (18) and extending between an opening in said turret end face (20) and an inner end partially defining a compression chamber (24), the pump further comprising
- a plunger (26) guided in said bore for reciprocating between BDC and TDC, the plunger extending between an upper end also partially defining said compression chamber and a lower end (28) protruding outside said bore (22) opening and extending along said main axis (A) and,
- a spring seat member (30) fixed to said part of the plunger that extends outside the bore and with,
- a spring (36) arranged around the turret (18) and compressed between the spring seat (34) integral to the spring seat member (30) and the face (16) of the pump body main member and wherein, said spring seat member (30) comprises a disc-like base (32) which annular peripheral area defines said spring seat (34) and which central area defines the bottom of a bucket (B) adapted to collect, in use, fuel leaking between the plunger and the bore, said bucket comprising a cylindrical peripheral wall (38) upwardly extending from said base and upwardly extending toward a distant edge (40).
2. High pressure pump (10) as claimed in the preceding claims said peripheral wall (38) defining with the turret (18) an annular clearance (C) enabling, in use, fuel present in the bucket (B) to exit the bucket by flowing through said clearance wetting the peripheral face to the turret.
3. High pressure pump (10) as claimed in claim 2 wherein said clearance (C) is of about 1mm to the radius.
4. High pressure pump (10) as claimed in the preceding claims wherein between the base (32) and the distant edge (40) said peripheral wall (38) axially extends along a height (H38) a little superior to the travel distance of the plunger between TDC and BDC.
5. High pressure pump (10) as claimed in claim 4 wherein, when in BDC, the edge (40) of the bucket peripheral wall just surrounds the distant end face (20) of the turret and where, in TDC, the bucket (B) is pulled-up by the plunger and the peripheral wall (38) of the bucket surrounds the end of the turret which distant end face (20) is close to the bottom of the bucket.
6. High pressure pump (10) as claimed in the preceding claims wherein the peripheral wall (38) is integral to the base (32), the spring seat member (30) being a monobloc part.
7. High pressure pump (10) as claimed in any one of the claims 1 to 5 wherein the peripheral wall (38) is a tubular sleeve (42) fixed to the base (32).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1800346.7A GB2570290B (en) | 2018-01-09 | 2018-01-09 | Fuel pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1800346.7A GB2570290B (en) | 2018-01-09 | 2018-01-09 | Fuel pump |
Publications (3)
Publication Number | Publication Date |
---|---|
GB201800346D0 GB201800346D0 (en) | 2018-02-21 |
GB2570290A true GB2570290A (en) | 2019-07-24 |
GB2570290B GB2570290B (en) | 2020-04-29 |
Family
ID=61190332
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1800346.7A Active GB2570290B (en) | 2018-01-09 | 2018-01-09 | Fuel pump |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2570290B (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005090784A1 (en) * | 2004-03-18 | 2005-09-29 | Robert Bosch Gmbh | High-pressure pump, in particular for a fuel-injection device of an internal combustion engine |
EP2271838A1 (en) * | 2008-03-26 | 2011-01-12 | Robert Bosch GmbH | Pump, particularly a high-pressure fuel pump |
EP3064759A1 (en) * | 2015-03-03 | 2016-09-07 | Delphi International Operations Luxembourg S.à r.l. | High temperature fuel deflector for a fuel pump drive assembly |
-
2018
- 2018-01-09 GB GB1800346.7A patent/GB2570290B/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005090784A1 (en) * | 2004-03-18 | 2005-09-29 | Robert Bosch Gmbh | High-pressure pump, in particular for a fuel-injection device of an internal combustion engine |
EP2271838A1 (en) * | 2008-03-26 | 2011-01-12 | Robert Bosch GmbH | Pump, particularly a high-pressure fuel pump |
EP3064759A1 (en) * | 2015-03-03 | 2016-09-07 | Delphi International Operations Luxembourg S.à r.l. | High temperature fuel deflector for a fuel pump drive assembly |
Also Published As
Publication number | Publication date |
---|---|
GB201800346D0 (en) | 2018-02-21 |
GB2570290B (en) | 2020-04-29 |
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