GB2168616A - Edge filter for fuel injection nozzle - Google Patents
Edge filter for fuel injection nozzle Download PDFInfo
- Publication number
- GB2168616A GB2168616A GB08531513A GB8531513A GB2168616A GB 2168616 A GB2168616 A GB 2168616A GB 08531513 A GB08531513 A GB 08531513A GB 8531513 A GB8531513 A GB 8531513A GB 2168616 A GB2168616 A GB 2168616A
- Authority
- GB
- United Kingdom
- Prior art keywords
- edge filter
- grooves
- peripheral surface
- nozzle
- outer peripheral
- 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.)
- Withdrawn
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 51
- 238000002347 injection Methods 0.000 title claims abstract description 20
- 239000007924 injection Substances 0.000 title claims abstract description 20
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 6
- 230000002093 peripheral effect Effects 0.000 claims description 32
- 239000007787 solid Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 abstract description 3
- 239000000428 dust Substances 0.000 description 7
- 239000010419 fine particle Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 210000002445 nipple Anatomy 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/44—Edge filtering elements, i.e. using contiguous impervious surfaces
-
- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/165—Filtering elements specially adapted in fuel inlets to injector
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
An edge filter 10 is fitted with small clearance into a fuel passage leading from an injection pump to an injection nozzle. The filter has parallel grooves 11a and 11b open at the upstream end face 10a and similar grooves 12a and 12b which open at the downstream end face 10b. Circumferential grooves 13 allow flow from grooves 11 to grooves 12, and grooves 13 are sized smaller than the injection nozzle apertures to retain particles which would otherwise clog the apertures. <IMAGE>
Description
SPECIFICATION
Edge filter for fuel injection nozzles
This invention relates to edge filters for fuel injection nozzles for use in internal combustion engines such as diesel engines.
A conventional edge filter for a fuel injection nozzle has been proposed, e.g. by Japanese
Utility Model Publication No. 56-17717, and
Japanese Provisional Patent Publication (Kokai)
No. 58-124063, which has a solid cylindrical body and is arranged in a fuel passage extending between a fuel injection pump and nozzle holes of the nozzle, at a location upstream of the nozzle holes. The proposed edge filter has its outer peripheral surface formed with at least two oil grooves which extend in directions opposite to each other, with their respective one ends opening, respectively, in one end face of the edge filter and the other end face of same, and their respective other ends terminating in the outer peripheral surface of the edge filter.In the above conventional edge filter, there is provided a fine clearance within a range from 0.03 to 0.06 mm between an inner peripheral surface of the fuel passage and the outer peripheral surface of the edge filter, which prevents particles or dust mixed in the fuel such as pieces of foil from passing therethrough.
However, since such clearance usually has an axial length more than 10 mm, dust having a thickness smaller than the clearance can pass through the clearance to be led through the fuel passage to the nozzle holes even if the dust size is larger than the inner diameter of each nozzle hole, which is usually of the order of 0.2 mm, resulting in that the dust cloggs the nozzle holes of the nozzle, adversely affecting the operation of the fuel injection nozzle.
It is the object of the invention to provide an edge filter for a fuel injection nozzle, which can substantially completely prevent particles or dust which is mixed in the fuel and larger in size than the inner diameter of nozzle holes of the nozzle from clogging nozzle holes.
The present invention provides an edge filter for a fuel injection nozzle having nozzle holes and a fuel passageway having an inner peripheral surface for supplying fuel to the nozzle holes, the edge filter being arranged in the fuel passageway at a location upstream of the nozzle holes of the nozzle, the edge filter having a solid interior, and one end face upstream in the fuel passageway and another end face downstream therein.The edge filter has an outer peripheral surface formed with at least one first groove and at least one second groove extending in directions opposite to each other, the first groove opening at one end thereof in the one end face of the edge filter, extending toward the another end face of the edge filter, and terminating at another end thereof in the outer peripheral surface of the edge filter, the second groove opening at one end thereof in the another end face of the edge filter, extending toward the one end face of the edge filter, and terminating at another end thereof in the outer peripheral surface of the edge filter.
The edge filter according to the present invention is characterized in that the outer peripheral surface of the edge filter is further formed with a plurality of third grooves located between the first and second grooves communicating same with each other, the third grooves each having a width and a depth both smaller than an inner diameter of the nozzle holes of the nozzle, and the edge filter is fitted in the fuel passageway with a small clearance between the inner peripheral surface of the fuel passageway and the outer peripheral surface of the edge filter.
The above and other objects, features and advantages of the invention will be more apparent from the ensuing detailed description taken in conjunction with the accompanying drawings.
Fig. 1 is a sectional view showing a fuel injection nozzle provided with an edge filter according to an embodiment of the invention;
Fig. 2 is a perspective view showing the edge filter appearing in Fig. 1;
Fig. 3 is an enlarged transverse cross-sectional view taken along line Ill-Ill in Fig. 2; and
Fig. 4 is an enlarged fragmentary longitudinal sectional view taken along line lV-IV in
Fig. 3.
An embodiment of the invention will now be described in detail with reference to the drawings.
Referring first to Fig. 1, there is illustrated a fuel injection nozzle provided with an edge filter according to the present invention. Reference numeral 1 designates a nozzle holder which has a generally cylindrical body. Coupled to a lower end face of the nozzle holder 1 is a nozzle body 2 having a lower end face formed with a plurality of nozzle holes 2a. A nozzle needle 3 is axially slidably fitted in an axial bore 2b formed in the nozzle body 2, to open and close the nozzle holes 2a. A nozzle spring 5 is accommodated within a spring chamber 14 defined within the nozzle holder 1, urging the nozzle needle 3 downward, i.e.
in a direction of closing the nozzle holes 2a via a push rod 4. A pressure chamber 6 is formed in the nozzle body 2 and defined between a lower end face of the nozzle needle 3 and the nozzle holes 2a, for urging the nozzle needle 3 upward, i.e. in a direction of opening the nozzle holes 2a against the urging force of the nozzle spring 5. The pressure chamber 6 is communicated with a fuel passage 7 formed in the nozzle holder 1 and the nozzle body 2, to be supplied with fuel pressure therethrough. The fuel passage 7 is communi cated with another fuel passage 9 formed within an inlet connector 8 mounted on an outer peripheral wall of the nozzle holder 1 and laterally projected therefrom. The inlet connector 8 has a generally cylindrical body with its opposite ends open.One end of the inlet connector 8 is screwed in a mounting hole la formed in the outer peripheral wall of the nozzle holder 1, while the other end of the connector 8 is connected to a fuel injection pump, not shown, via an injection pipe 17.
An edge filter 10 according to the invention is arranged in the fuel passage 9 within the inlet connector 8.
As shown in Figs. 2 and 3, the edge filter 10 is an elongate member having a generally cruciform cross section, and has its outer peripheral surface formed with a plurality of, e.g.
four, oil grooves 1 lea, Ilb, 12a, and 12b, the former two axially extending from one end face 10a of the edge filter 10, and the latter two from the other end face 11 b of same, respectively, and in opposite directions to each other. The oil grooves lla--12b terminate in the outer peripheral surface of the edge filter 10 in the vicinity of the respective ends of the edge filter 10. In other words, adjacent ones of the oil grooves Ila, Ilb.
12a, and 12b extend from end faces of the filter 10 opposite to each other and in directions axially opposite to each other. To be specific, a pair of oil grooves 1 1a, 1 1b which are disposed diametrically opposite to each other on the outer peripheral surface of the filter 10 open in one end face 10a of the filter 10 and extend toward the other or opposite end, while the other pair of oil grooves 12a, 12b also disposed diametrically opposite to each other on the outer peripheral surface of the filter 10 open in the other end face 10b of the filter 10 and extend toward the opposite end. As shown in Fig. 3, each oil groove has a generally V-shaped cross section.
Further, a plurality of grooves 13 are formed in the outer peripheral surface of the edge filter 10, exactly in ridges 10c between adjacent ones of the oil grooves Ila, Ilb, 12a, and 12b, and circumferentially extend, to communicate the respective adjacent oil grooves with each other. As shown in Fig. 4, each groove 13 has a width L and a depth H both smaller than the inner diameter, e.g. 0.2 mm, of each nozzle hole 2a. In the illustrated embodiment, the width L and depth H are set at the same value, e.g. 0.2 mm. The grooves 13 are juxtaposed longitudinally of each ridge. In the illustrated embodiment, the pitch P of the grooves 13 is set at a value equal to the width L. The grooves 13 may be formed by thread rolling or by tapping.The edge filter 10 configurated as above is fitted into the fuel passage 9 in a manner such that a small clearance is provided between the outer peripheral surface of the ridges 10c and the inner peripheral surface of the fuel passage 9.
Reverting to Fig. 1, an overflow nipple 15 is mounted on the outer peripheral wall of the nozzle holder 1, which has its interior communicating with the spring chamber 14. The interior of the overflow nipple 15 also communicates with a fuel tank, not shown, via a pipe 16, for returning part of the fuel supplied to the pressure chamber 6 after it has been used to lubricate sliding portions of the nozzle needle 3 and supplied to the spring chamber 14 through a relief passage formed around the push rod 4.
Next, the operation of the edge filter 10 according to the invention constructed as above will be explained.
Fuel is pressure delivered from the fuel injection pump and led to the fuel passage 9 within the inlet connector 8. While the fuel passes through the fuel passage 9, fine particles or dust which is mixed in the fuel is collected by the edge filter 10. Since the edge filter 10 is fitted in the fuel passage 9 with a very small clearance provided between the outer peripheral surface of the filter 10 and the inner peripheral surface of the fuel passage 9, and the one pair of diametrically opposite oil grooves Ila, 1 1b opening in the one end face IOa of the edge filter are communicated with the other pair of diametrically opposite oil grooves 12a, 12b opening in the other end face 10b of same, only through the grooves 13 with their width L and depth H smaller than the inner diameters of the nozzle holes 2a. As a result, almost all fine particles or dust such as pieces of foil mixed in the fuel and larger than the inner diameter of the nozzle holes 2a is prevented from passing through the grooves 13, and thus caught by the edge filter 10. Therefore, the possibility of the nozzle holes 2a being clogged is greatly reduced. Thus, the edge filter 10 according to the invention has improved capability of filtering the fuel as compared to the conventional edge filter, thereby always allowing positive operation of the fuel injection nozzle.
Claims (6)
1. An edge filter for a fuel injection nozzle having nozzle holes and a fuel passageway having an inner peripheral surface for supplying fuel to said nozzle holes, said edge filter being arranged in said fuel passageway at a location upstream of said nozzle holes of said nozzle, said edge filter having a solid interior, and one end face upstream in said fuel passageway and another end face downstream therein, said edge filter having an outer peripheral surface formed with at least one first groove and at least one second groove extending in directions opposite to each other, said first groove opening at one end thereof in said one end face of said edge filter, extending toward said another end face of said edge filter, and terminating at another end thereof in said outer peripheral surface of said edge fil ter, said second groove opening at one end thereof in said another end face of said edge filter, extending toward said one end face of said edge filter, and terminating at another end thereof in said outer peripheral surface of said edge filter, said outer peripheral surface of said edge filter being further formed with a plurality of third grooves located between said first and second grooves communicating same with each other, said third grooves each having a width and a depth both smaller than an inner diameter of said nozzle holes of said nozzle, said edge filter being fitted in said fuel passageway with a small clearance between said inner peripheral surface of said fuel passageway and said outer peripheral surface of said edge filter.
2. An edge filter as claimed in claim. 1, wherein said third grooves are juxtaposed on said outer peripheral surface of said edge filter between said first and second grooves with a pitch equal to the width of each of said second grooves.
3. An edge filter as claimed in claim 1 or claim 2, wherein said first and second grooves extend axially of said edge filter, and said third grooves extend circumferentially of said edge filter.
4. An edge filter as claimed in claim 1, wherein said outer peripheral surface of said edge filter has a ridge formed between said first and second grooves, said third grooves being formed in said ridge and juxtaposed longitudinally of said ridge.
5. An edge filter for a fuel injection nozzle, substantially as hereinbefore described with reference to, and as illustrated in, the accompanying drawings.
6. A fuel injection nozzle having an edge filter as claimed in any preceding Claim.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984192869U JPS61107969U (en) | 1984-12-21 | 1984-12-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8531513D0 GB8531513D0 (en) | 1986-02-05 |
| GB2168616A true GB2168616A (en) | 1986-06-25 |
Family
ID=16298324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08531513A Withdrawn GB2168616A (en) | 1984-12-21 | 1985-12-20 | Edge filter for fuel injection nozzle |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS61107969U (en) |
| KR (1) | KR920005734B1 (en) |
| DE (1) | DE3544503A1 (en) |
| GB (1) | GB2168616A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2762364A1 (en) * | 1997-04-22 | 1998-10-23 | Bosch Gmbh Robert | FUEL INJECTOR FOR INTERNAL COMBUSTION ENGINE |
| WO2000005500A1 (en) * | 1998-07-22 | 2000-02-03 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engines |
| EP1055815A3 (en) * | 1999-05-22 | 2003-09-24 | Delphi Technologies, Inc. | Fuel filter |
| DE10240518A1 (en) * | 2002-09-03 | 2004-03-11 | Deutz Ag | Common rail fuel injection system for IC engines has injection pipe containing filter and directly connected to injection valve holder |
| WO2006049598A1 (en) * | 2004-10-28 | 2006-05-11 | Robert Bosch Gmbh | Fuel injector filter |
| EP1729006A1 (en) * | 2005-06-03 | 2006-12-06 | Robert Bosch Gmbh | Filter arrangement with edge filter with structured surface |
| EP1795742A1 (en) * | 2005-12-12 | 2007-06-13 | Robert Bosch Gmbh | Edge-Filter |
| EP1371840B1 (en) * | 2002-06-12 | 2008-06-04 | Robert Bosch Gmbh | Fuel injection system with solid damping element |
| WO2020112362A1 (en) * | 2018-11-29 | 2020-06-04 | Caterpillar Inc. | Filter for fuel injectors |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4312936C2 (en) * | 1993-04-21 | 2000-05-25 | Deutz Ag | Fuel injector |
| DE4437927C2 (en) * | 1994-10-24 | 1996-09-12 | Bosch Gmbh Robert | Solenoid valve-controlled fuel injection device with an injection nozzle for fuel injection into the combustion chamber of a diesel internal combustion engine |
| DE102007002071A1 (en) * | 2007-01-09 | 2008-07-10 | Reich Gmbh | Filter for liquids, particularly for fuel, has housing, which has inside through flow channel with channel wall surface, filter element, at which outer wall is formed and has inlet and outlet |
| CN109306928B (en) * | 2017-07-27 | 2023-05-23 | 罗伯特·博世有限公司 | Filter for fuel injector |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB645908A (en) * | 1948-05-05 | 1950-11-08 | Lionel Haworth | Improvements in or relating to spraying nozzles for liquid fuel burners |
| GB976521A (en) * | 1963-04-04 | 1964-11-25 | Rolls Royce | Liquid filter |
| GB1230563A (en) * | 1967-05-04 | 1971-05-05 | ||
| GB1599566A (en) * | 1977-03-11 | 1981-10-07 | Magna Int Inc | Injection nozzle for a plastics injection moulding machine |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5617717Y2 (en) * | 1976-12-20 | 1981-04-24 | ||
| DE3201218A1 (en) * | 1982-01-16 | 1983-07-28 | Robert Bosch Gmbh, 7000 Stuttgart | FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES |
| DE8207852U1 (en) * | 1982-03-19 | 1983-09-29 | Robert Bosch Gmbh, 7000 Stuttgart | FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES |
| DE3210209A1 (en) * | 1982-03-19 | 1983-09-29 | Robert Bosch Gmbh, 7000 Stuttgart | Fuel injection nozzle for internal combustion engines |
| DE3237932A1 (en) * | 1982-10-13 | 1984-04-19 | Robert Bosch Gmbh, 7000 Stuttgart | FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES |
-
1984
- 1984-12-21 JP JP1984192869U patent/JPS61107969U/ja active Pending
-
1985
- 1985-12-14 KR KR1019850009410A patent/KR920005734B1/en not_active IP Right Cessation
- 1985-12-17 DE DE19853544503 patent/DE3544503A1/en active Granted
- 1985-12-20 GB GB08531513A patent/GB2168616A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB645908A (en) * | 1948-05-05 | 1950-11-08 | Lionel Haworth | Improvements in or relating to spraying nozzles for liquid fuel burners |
| GB976521A (en) * | 1963-04-04 | 1964-11-25 | Rolls Royce | Liquid filter |
| GB1230563A (en) * | 1967-05-04 | 1971-05-05 | ||
| GB1599566A (en) * | 1977-03-11 | 1981-10-07 | Magna Int Inc | Injection nozzle for a plastics injection moulding machine |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2762364A1 (en) * | 1997-04-22 | 1998-10-23 | Bosch Gmbh Robert | FUEL INJECTOR FOR INTERNAL COMBUSTION ENGINE |
| WO2000005500A1 (en) * | 1998-07-22 | 2000-02-03 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engines |
| EP1055815A3 (en) * | 1999-05-22 | 2003-09-24 | Delphi Technologies, Inc. | Fuel filter |
| EP1371840B1 (en) * | 2002-06-12 | 2008-06-04 | Robert Bosch Gmbh | Fuel injection system with solid damping element |
| DE10240518A1 (en) * | 2002-09-03 | 2004-03-11 | Deutz Ag | Common rail fuel injection system for IC engines has injection pipe containing filter and directly connected to injection valve holder |
| WO2006049598A1 (en) * | 2004-10-28 | 2006-05-11 | Robert Bosch Gmbh | Fuel injector filter |
| EP1729006A1 (en) * | 2005-06-03 | 2006-12-06 | Robert Bosch Gmbh | Filter arrangement with edge filter with structured surface |
| EP1795742A1 (en) * | 2005-12-12 | 2007-06-13 | Robert Bosch Gmbh | Edge-Filter |
| WO2020112362A1 (en) * | 2018-11-29 | 2020-06-04 | Caterpillar Inc. | Filter for fuel injectors |
Also Published As
| Publication number | Publication date |
|---|---|
| KR920005734B1 (en) | 1992-07-16 |
| GB8531513D0 (en) | 1986-02-05 |
| DE3544503C2 (en) | 1988-04-14 |
| KR860005133A (en) | 1986-07-18 |
| DE3544503A1 (en) | 1986-06-26 |
| JPS61107969U (en) | 1986-07-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |