GB2058948A - A fuel injection pump for an internal combustion engine - Google Patents
A fuel injection pump for an internal combustion engine Download PDFInfo
- Publication number
- GB2058948A GB2058948A GB8028671A GB8028671A GB2058948A GB 2058948 A GB2058948 A GB 2058948A GB 8028671 A GB8028671 A GB 8028671A GB 8028671 A GB8028671 A GB 8028671A GB 2058948 A GB2058948 A GB 2058948A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- pressure
- relief valve
- pressure line
- relief
- 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- Withdrawn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
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
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/46—Valves
- F02M59/462—Delivery valves
-
- 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
- F02M63/0012—Valves
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/005—Pressure relief valves
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
A fuel injection pump for an internal combustion engine has a constant-pressure relief valve 18 which is constructed so as to take up only a small amount of installation space. A relief valve (21) is disposed between a pressure valve (22) and a pump working chamber (16) and parallel to a pressure line portion (38) and is disposed in a cylindrical portion (35) of the valve housing (19), having fuel flowing therearound, and eccentrically of the longitudinal axis of the valve housing (19) by such an amount (a) that the smallest wall thicknesses (s1 and s2) between the outer surface (36) of the valve housing (19) and the pressure line portion (38) and between the said outer surface and the spring chamber (27) are at least approximately equal. <IMAGE>
Description
SPECIFICATION
A fuel injection pump for an internal com- bustion engine
The present invention relates to a fuel injection pump for an internal combustion engine.
In particular the invention relates to a fuel injection pump having a reciprocating pump piston which defines a pump working chamber, and a constant-pressure relief valve which is fitted in the pressure line leading to the injection valve and which comprises a relief valve and a pressure valve. The relief valve is located between the pressure valve and the pump working chamber and is disposed paraliel to a pressure line portion connecting the pump working chamber to the pressure valve.
For the purpose of controlling a constant pressure relief of the pressure line, the relief valve controls the connection between the pressure line and the pump working chamber by way of a transverse bore which by-passes the pressure valve and which is disposed in a cylindrical portion of the valve housing having fuel flowing therearound.In fuel injection pumps of this type which are known from
German Published Patent Specification Auslegesschrift 1 297 935 and which are equipped with constant-pressure relief valves, the pressure line portions extend parallel to the relief valve owing to the fact that the latter valve is arranged concentrically in the constant-pressure relief valve, thus leading to an increase in the external diameter of the cylindrical part of the valve housing which has fuel flowing therearoundvand rendering it difficult to fit the valve in existing pumps. Therefore, a reinforced pump housing has to be used for accommodating the valve of enlarged diameter, otherwise the wall thickness between the portions of the pressure line and the outer surface of the cylindrical part of the valve housing are rendered inadmissibly thin, thus involving the risk of fracture or cracks.
According to the present invention there is provided a fuel injection pump for an internal combustion engine, having a reciprocating pump piston which defines a pump working chamber, and a constant-pressure relief valve which is fitted in the pressure line leading to the injection valve and which comprises a relief valve and a pressure valve which are disposed, in a valve housing, physically one behind the other in the direction of flow of the fuel, which relief valve is located between the pressure valve and the pump working chamber and is disposed parallel to a pressure line portion connecting the pump working chamber to the pressure valve and, for the purpose of controlling a constant pressure relief of the pressure line, controls the connection between the pressure line and the pump working chamber by way of a transverse bore which by-passes the pressure valve and which is disposed in a cylindrical portion of the valve housing having fuel flowing therearound, at least the relief valve being in the form of a spring-loaded ball valve, and being disposed eccentrically with respect to the axis of the valve housing by such an amount that the smallest wall thicknesses between an outer surface of the cylindrical portion of the valve housing and a bore forming a spring chamber of the relief valve, and between the said outer surface and the pressure line portion are at least approximately equal.
In contrast to the prior art, the fuel injection pump in accordance with the invention has the advantage that the constant-pressure relief valve has an extremely slender construction which thus renders it possible subsequently to fit the said valve in existing fuel injection pumps and which leads to only a slight increase in the diameter of the pump.
An extremely thin partition is rendered possible between the bores of the pressure line portion and of the spring chamber because they are always subjected to the same pressure. Thus, manufacture is facilitated and satisfactory separation between the pressure and the relief lines is achieved.
An extremely compact construction is made possible by arranging for the bore of the pressure line portion to intersect with the bore of the relief valve spring chamber, and by providing a relieved chamber which serves as the pressure portion and the relief valve spring chamber intersections of the bores which involve additional expense during debburing are avoided also thin, sensitive walls are avoided. An efficient constant-pressure relief valve which is simple and inexpensive to manufacture and which is of particularly slender construction is achieved when the pressure and relief valves are ball valves.
The present invention will now be described further by way of example only, with reference to the accompanying drawings, in which:
Figure 1 is a longitudinal section of parts of a first embodiment of a fuel injection pump in accordance with the invention, and
Figures 2 and 3 show second and third embodiments respectively of a fuel injection pump having a modified constant-pressure relief valve, relative to Fig. 1.
A pump cylinder 1 2 is fitted in a bore 10 in a housing 11 of an injection pump (only partially illustrated in Fig. 1). A pump piston 1 5 provided with an oblique control edge 14 slides in the cylindrical bore 1 3 of the pump cylinder 1 2. The known parts of the cam drive for the pump piston and the timing device for varying the quantity of injection are not shown. The cylindrical bore 1 3 incorporates a pump working chamber 1 6 which is defined at one end by an end face 1 7 of the pump piston 1 5 and at the other end by a constantpressure relief valve 1 8.
A valve housing 19 9 of the constant-pressure relief valve 18 incorporates a relief valve 21 and a pressure valve 22 which are physically arranged one behind the other in the direction of flow of the fuel. The valve housing 1 9 has a bottom flange 23 by means of which the valve housing 1 9 is clamped to the cylindrical sleeve 1 2 by way of an interposed sealing ring 24 by a pipe connection piece 25 which is screwed into the pump housing 11, and secures the cylindrical sleeve in the pump housing 11. The valve housing 23 and the pump cylinder 1 2 are sealed metal-to-metal at their end faces which are in contact with one another.
Both the relief valve 21 and the pressure valve 22 are in the form of spring-loaded ball valves, and a valve spring 26 of the relief valve 21 abuts against an abutment 27 adjacent to the pump working chamber. A valve spring 28 of the pressure valve 22 abuts against an abutment 29 which, like the abutment 27, is held in the valve housing 1 9 by means of a spring ring 31.
The pump working chamber 1 6 is connected by way of the constant-pressure relief valve 1 8 and a pressure line portion 32 located in the pipe connection piece 25 to a pressure line 33 (only indicated) which leads to the injection nozzle.
A neck-like, cylindrical portion 35 of the valve housing 19, having fuel flowing therearound, is contiguous with the flange 23 and extends within an enlarged longitudinal bore 34 in the pipe connection piece 25 and incorporates the relief valve 21 and the pressure valve 22. The relief valve 21 is offset by an amount a relative to the longitudinal axis of the pressure valve 22 such that the smallest wall thickness s1 between the outer surface 36 of the cylindrical portion 35 and a bore 37 forming the spring chamber of the relief valve 21, and the smallest wall thickness s2 between the outer surface 36 and a pressure line portion 38 disposed parallel to the relief valve 21 and connecting the pump working chamber 1 6 to the pressure valve 22, are at least approximately equal.Thus, the cylindrical portion 35 of the valve housing 1 9 can be of extremely slender construction, so that the entire constant-pressure relief valve 1 8 can be fitted in commercially available fuel injection pumps to replace normal pressure valves. A partition 39, which is only a few tenths of a millimitre thick, is provided between the pressure line portion 38 and the bore 37 forming the spring chamber of the relief valve 21. The reason why this partition can be extremely thin is because the same pressure always prevails in the pressure line portion 38 and in the spring chamber 37, so that there is virtually no stress on this wall and it has no perceptible effect on the overall size.
The pressure valve 22 in the form of a ball valve is disposed concentrically in the valve housing 1 9 and its spring chamber 41 is connected by way of transverse bores 42 to a space 43 which is located within the longitudinal bore 34 in the pipe connection piece 25 and which surrounds the cylindrical portion 35 of the valve housing 19, the spring chamber 41 being connected to the pressure line portion 32 and to the pressure line 33 by way of the space 43.
For the purpose of relieving the pressure line 33, the space 43 is connected by way of a transverse bore 44 to the relief valve 21 which, when the injection operation has ended and the pump working chamber 1 6 is thus relieved, connects the pressure line 33 by way of the pressure line portion 32 and the space 43 to the spring chamber 37 of the relief valve 21 and then to the pump working chamber 1 6.
Only the constant-pressure relief valve 18' of the second embodiment is illustrated in Fig.
2. The relief valve 21 and the pressure valve 22 are constructed and arranged in the same manner as the two valves of Fig. 1, the only difference between the valve 18' and the valve 1 8 of Fig. 1 being that the bore which is designated 38' in the present instance, and which forms the pressure line portion, intersects the spring chamber 37, so that the two bores 37 and 38' merge into one another in the region of the spring chamber 37 and form a common chamber. An arrangement of this kind is somewhat more difficult to beburr than that shown in Fig. 1, although it enables the valve housing 19' to be of even more slender construction or enables the pressure line portion 38' to have a larger diameter, so that the pressure line portion 38' also overlaps a bore 45 controlled by the pressure valve 22 and simplifies the formation of the passages.As in the first embodiment, the wall thicknssses s, and s2 are at least approximately equal by virtue of the fact that the relief valve 21 is arranged off-centre.
Only the constant-pressure valve 18" of the third embodiment is illustrated in Fig. 3. The pressure valve 22 is of the same construction as that in the two embodiments described previously, although the relief valve 21 has a modified spring chamber 37". The spring chamber 37" is formed or surrounded above the abutment 27 of the valve spring 26 by a relief chamber 46 which, despite an eccentrically disposed relief valve 21, is incorporated concentrically in the valve housing 19". The pressure line portion 38' connecting the
pump working chamber to the pressure valve 22 opens into this chamber formed by the
relief chamber 46. The pressure line portion
38' is shorter than the bore portion 38' shown in Fig. 2, although it is in the same
position, and has the same diameter, as the
latter portion and is thus provided with the same reference numeral. The wall thickness S4 between the relief 46 or spring chamber 37" and the outer surface 36" of the cylindrical portion 35" of the valve housing 19" is uniform around the entire circumference, and the wall thickness s2 between the pressure line portion 38' and the outer surface 36" is equal to that of Fig. 2 and is at least approximately equal to the wall thickness 54. However, like the valves of Figs. 1 and 2, a bore portion 47 accommodates the spring abutment 27 for the valve spring 26 of the relief valve 21 is disposed eccentrically of the valve housing 19" and concentrically of the relief valve 21 and, in addition to accommodating the abutment 27, also accommodates the spring ring 31 holding the said abutment.
The mode of operation of the constantpressure relief valves in accordance with the invention, and which have been described with reference to Figs. 1 to 3, does not differ perceptibly from that of the known valves and will be described hereinafter with reference to
Fig. 1:
During delivery by the pump, the fuel to be injected is delivered by the pump piston 1 5 from the pump working chamber 1 6 into the pressure line 33 leading to the injection nozzle by way of the pressure line portion 38, the pressure valve 21, the transverse bores 42, the space 43 and the pressure line portion 32.Upon termination of injection, when the oblique control edge 14 on the pump piston 1 5 opens a control port 48 in the wall of the pump cylinder 12, the pressure in the pump working chamber 1 6 drops abruptly, the pressure valve 22 closes the passage between the pressure line portion 38 and the pressure line 33, and the residual pressure in the pressure line 33, in the pressure line portion 32 and in the space 43 acts upon the relief valve 21 by way of the transverse bore 44 connecting the space 43 to the relief valve 21. This valve 21 is opened and connects the space 43 to the spring chamber 37 and thus also to the pressure-relieved pump working chamber 16.
The initial stress of the valve spring 26 of the relief valve 21 and, if required, also the transverse bore 44 in the form of a throttle bore, determine the pressure level at which, and the speed with which, the relief takes place.
Claims (6)
1. A fuel injection pump for an internal combustion engine, having a reciprocating pump piston which defines a pump working chamber, and a constant-pressure relief valve which is fitted in the pressure line leading to the injection valve and which comprises a relief valve and a pressure valve which are disposed in a valve housing, physically one behind the other in the direction of flow of the fuel, which relief valve is located between the pressure valve and the pump working chamber and is disposed parallel to a pressure line portion connecting the pump working chamber to the pressure valve and, for the purpose of controlling a constant-pressure relief of the pressure line, controls the connection between the pressure line and the pump working chamber by way of a transverse bore which by-passes the pressure valve and which is disposed in a cylindrical portion of the valve housing having fuel flowing therearound, at least the relief valve being in the form of a spring-loaded ball valve, and being disposed eccentrically with respect to the axis of the valve housing by such an amount that the smallest wall thicknesses between an outer surface of the cylindrical portion of the valve housing and a bore forming a spring chamber of the relief valve and between the said outer surface and the pressure line portion are at least approximately equal.
2. A fuel injection pump as claimed in claim 1, in which a partition having a thickness of a few tenths of a millimetre is provided between the pressure line portion and the bore forming the spring chamber of the relief valve.
3. A fuel injection pump as claimed in claim 1, in which the bore forming the pressure line portion intersects the spring chamber of the relief valve and a bore of the pressure valve.
4. A fuel injection pump as claimed in claim 1, in which the pressure line portion opens into a concentric relief chamber which surrounds the spring chamber of the relief valve and whose wall thickness to the outer surface of the cylindrical portion of the valve housing is uniform around the entire circumference, and in which a bore portion accommodating an abutment for the valve spring of the relief valve is disposed eccentrically of the longitudinal axis of the valve housing and concentrically of the axis of the relief valve.
5. A fuel injection valve as claimed in any of the claims 1 to 4, in which the pressure valve and the relief valve are in the form of ball valves.
6. A fuel injection pump constructed and arranged substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19797925377 DE7925377U1 (en) | 1979-09-07 | 1979-09-07 | FUEL INJECTION PUMP FOR COMBUSTION MACHINES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2058948A true GB2058948A (en) | 1981-04-15 |
Family
ID=6707174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8028671A Withdrawn GB2058948A (en) | 1979-09-07 | 1980-09-05 | A fuel injection pump for an internal combustion engine |
Country Status (4)
| Country | Link |
|---|---|
| AT (1) | ATA445780A (en) |
| DE (1) | DE7925377U1 (en) |
| FR (1) | FR2468758A1 (en) |
| GB (1) | GB2058948A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0207898A2 (en) * | 1985-07-02 | 1987-01-07 | WEBER S.r.l. | Fuel injection apparatus for diesel engines |
| WO2007122127A1 (en) | 2006-04-25 | 2007-11-01 | Robert Bosch Gmbh | High pressure fuel pump |
| US8132558B2 (en) | 2009-12-01 | 2012-03-13 | Stanadyne Corporation | Common rail fuel pump with combined discharge and overpressure relief valves |
| EP2664784A1 (en) * | 2012-05-15 | 2013-11-20 | Veritas Ag | Pressure maintenance valve for a fuel line |
| EP2740926A1 (en) * | 2011-08-01 | 2014-06-11 | Toyota Jidosha Kabushiki Kaisha | Fuel injection pump |
| JP2014148980A (en) * | 2014-05-28 | 2014-08-21 | Hitachi Automotive Systems Ltd | High-pressure fuel supply pump |
| US9828958B2 (en) | 2011-03-08 | 2017-11-28 | Hitachi Automotive Systems, Ltd. | High-pressure fuel supply pump |
| US20180291855A1 (en) * | 2017-04-07 | 2018-10-11 | Continental Automotive Gmbh | Fuel injection system for an internal combustion engine |
| WO2019007571A1 (en) * | 2017-07-05 | 2019-01-10 | Robert Bosch Gmbh | Connection piece for a high-pressure fuel pump, and high-pressure fuel pump |
| CN111322187A (en) * | 2014-04-25 | 2020-06-23 | 日立汽车系统株式会社 | High-pressure fuel supply pump |
| US11352994B1 (en) * | 2021-01-12 | 2022-06-07 | Delphi Technologies Ip Limited | Fuel pump and combination outlet and pressure relief valve thereof |
-
1979
- 1979-09-07 DE DE19797925377 patent/DE7925377U1/en not_active Expired
-
1980
- 1980-08-05 FR FR8017309A patent/FR2468758A1/en not_active Withdrawn
- 1980-09-04 AT AT445780A patent/ATA445780A/en not_active Application Discontinuation
- 1980-09-05 GB GB8028671A patent/GB2058948A/en not_active Withdrawn
Cited By (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0207898A3 (en) * | 1985-07-02 | 1989-04-26 | WEBER S.r.l. | Fuel injection apparatus for diesel engines |
| EP0207898A2 (en) * | 1985-07-02 | 1987-01-07 | WEBER S.r.l. | Fuel injection apparatus for diesel engines |
| CN101432518B (en) * | 2006-04-25 | 2012-07-11 | 罗伯特·博世有限公司 | High pressure fuel pump |
| WO2007122127A1 (en) | 2006-04-25 | 2007-11-01 | Robert Bosch Gmbh | High pressure fuel pump |
| JP2009534582A (en) * | 2006-04-25 | 2009-09-24 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | Fuel high pressure pump |
| EP2333304A1 (en) * | 2006-04-25 | 2011-06-15 | Robert Bosch GmbH | High pressure fuel pump |
| EP2336546A1 (en) * | 2006-04-25 | 2011-06-22 | Robert Bosch GmbH | High pressure fuel pump |
| US8202065B2 (en) | 2006-04-25 | 2012-06-19 | Robert Bosch Gmbh | High pressure fuel pump |
| US8132558B2 (en) | 2009-12-01 | 2012-03-13 | Stanadyne Corporation | Common rail fuel pump with combined discharge and overpressure relief valves |
| EP2507505A1 (en) * | 2009-12-01 | 2012-10-10 | Stanadyne Corporation | Common rail fuel pump with combined discharge and overpressure relief valves |
| EP2507505A4 (en) * | 2009-12-01 | 2014-02-05 | Stanadyne Corp | Common rail fuel pump with combined discharge and overpressure relief valves |
| US10788004B2 (en) | 2011-03-08 | 2020-09-29 | Hitachi Automotive Systems, Ltd. | High-pressure fuel supply pump |
| US9828958B2 (en) | 2011-03-08 | 2017-11-28 | Hitachi Automotive Systems, Ltd. | High-pressure fuel supply pump |
| EP2740926A1 (en) * | 2011-08-01 | 2014-06-11 | Toyota Jidosha Kabushiki Kaisha | Fuel injection pump |
| EP2740926A4 (en) * | 2011-08-01 | 2014-12-17 | Toyota Motor Co Ltd | Fuel injection pump |
| EP2664784A1 (en) * | 2012-05-15 | 2013-11-20 | Veritas Ag | Pressure maintenance valve for a fuel line |
| CN111322187A (en) * | 2014-04-25 | 2020-06-23 | 日立汽车系统株式会社 | High-pressure fuel supply pump |
| CN111322187B (en) * | 2014-04-25 | 2021-12-31 | 日立安斯泰莫株式会社 | High-pressure fuel supply pump |
| JP2014148980A (en) * | 2014-05-28 | 2014-08-21 | Hitachi Automotive Systems Ltd | High-pressure fuel supply pump |
| CN108691705A (en) * | 2017-04-07 | 2018-10-23 | 大陆汽车有限公司 | fuel injection system for internal combustion engine |
| US10781780B2 (en) * | 2017-04-07 | 2020-09-22 | Vitesco Technologies GmbH | Fuel injection system for an internal combustion engine |
| CN108691705B (en) * | 2017-04-07 | 2021-05-18 | 大陆汽车有限公司 | Fuel injection system for internal combustion engine |
| US20180291855A1 (en) * | 2017-04-07 | 2018-10-11 | Continental Automotive Gmbh | Fuel injection system for an internal combustion engine |
| CN110832185A (en) * | 2017-07-05 | 2020-02-21 | 罗伯特·博世有限公司 | Attachment stub for a high-pressure fuel pump and high-pressure fuel pump |
| WO2019007571A1 (en) * | 2017-07-05 | 2019-01-10 | Robert Bosch Gmbh | Connection piece for a high-pressure fuel pump, and high-pressure fuel pump |
| US11434859B2 (en) | 2017-07-05 | 2022-09-06 | Robert Bosch Gmbh | Connection piece for a high-pressure fuel pump, and high-pressure fuel pump |
| US11352994B1 (en) * | 2021-01-12 | 2022-06-07 | Delphi Technologies Ip Limited | Fuel pump and combination outlet and pressure relief valve thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| ATA445780A (en) | 1982-03-15 |
| FR2468758A1 (en) | 1981-05-08 |
| DE7925377U1 (en) | 1979-12-06 |
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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) |