WO1994020749A1 - Verbrennungsmotor mit kraftstoffeinspritzung, insbesondere einzylinder-dieselmotor - Google Patents
Verbrennungsmotor mit kraftstoffeinspritzung, insbesondere einzylinder-dieselmotor Download PDFInfo
- Publication number
- WO1994020749A1 WO1994020749A1 PCT/EP1994/000753 EP9400753W WO9420749A1 WO 1994020749 A1 WO1994020749 A1 WO 1994020749A1 EP 9400753 W EP9400753 W EP 9400753W WO 9420749 A1 WO9420749 A1 WO 9420749A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- valve
- combustion engine
- internal combustion
- engine according
- valve housing
- 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
- F02M59/44—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
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/02—Light metals
- F05C2201/021—Aluminium
Definitions
- the invention relates to an internal combustion engine with fuel injection, in particular a single-cylinder diesel engine, in which the injection pump is connected to the fuel pressure line via a constant pressure valve device with a delivery valve and an oppositely continuous relief valve, both valves in a separate one placed directly on the pump cylinder Valve housing, are arranged eccentrically next to each other with respect to the cylinder axis.
- the combustion chamber in the engine must be supplied with an exactly metered injection quantity at high pressure. Damaged spaces in the line connection between the injection pump and the injection nozzle make it difficult to optimize the start of combustion and require additional measures to compensate for them, such as the arrangement of an injection adjuster, which shifts the start of delivery of the pump forward with increasing speed. In the case of spatially separate arrangement of the injection pump and injection nozzle, delays due to pressure wave running times can be compensated for at the same time.
- the fuel quantity is controlled as a function of the load and speed by means of a control device on the injection pump.
- a known constant pressure valve device on the injection pump serves the purpose of compensating for the pressure vibrations in the line system. Care must be taken to minimize the amount of harmful space in the line system, for example by bringing the injection pump as close as possible to the injection nozzle or by largely avoiding constructional dreams.
- a constant pressure valve device in which the delivery takes place via a delivery valve with a large cross section and via a relief valve with opposite flow direction and a small throttle bore the line is relieved; both valves are non-return Valves with valve bodies as balls and with valve springs as coil springs.
- the valves are arranged next to one another in blind holes in the valve housing, which are connected to the corresponding connection spaces via further holes. This type of construction requires a considerable axial length of the valve housing and there are correspondingly large disruptive damage areas.
- valve housing has transverse grooves on its opposite end faces, via which the assigned valve bores are connected to one another and on the one hand to the working chamber of the pump and on the other hand to the fuel pressure line in a valve holder placed on the valve housing .
- valve bodies are balls in a proven manner or have spherical surfaces with which they are pressed against conical valve seats by valve springs, preferably with a cone angle of the valve seats of 60 °; this cone angle is superior to the usually larger cone angles in terms of flow.
- the valve springs are coil springs, each of which is seated in a valve housing bore through which the valve flows.
- the receiving bores for the two coil springs each open into the associated end face of the valve housing and enable the end of the coil springs facing away from the valve body to be supported on the adjacent component; the latter is formed for the relief valve by the end wall of the pump cylinder and for the delivery valve by the valve holder which is placed on the pressure side on the valve housing and which with the Injection line connected fuel pressure line.
- valve springs are designed as leaf springs, each of which is seated in a corresponding flow-through chamber of the valve housing.
- the two chambers are each open to a common dividing joint between two valve housing parts, the valve seat corresponding to the respective chamber being arranged in the other valve housing part, with a cone angle opening towards the separating joint.
- the valve housing is thus divided in two, which further simplifies production.
- the leaf springs are each slidably supported with their opposite ends against the rear wall of the associated chamber, and that the rear wall is provided with a sliding layer.
- the injection pump sits directly in the wall of the crankcase, which e.g. made of cast aluminum, it is expedient to protect it against the impetus of the pump by means of an impact protection in the form of a sleeve made of hardened steel.
- the sleeve sits in a bore surrounding the injection pump and delimits a suction space acted upon by the fuel pump.
- FIG. 1 shows an axial section through a first embodiment of the injection pump
- FIG. 2 shows an axial section through the valve housing according to FIG. 1, in an enlarged representation
- FIG. 3 shows a plan view of the valve housing according to FIG. 2,
- FIG. 4 shows a view of the valve housing according to FIG. 2 from below
- FIG. 5 shows a section through the valve housing according to VV of FIG. 3
- 6 shows an axial section through a second embodiment of the injection pump
- FIG. 7 shows an axial section through the valve housing according to FIG. 6, on an enlarged scale
- FIGS. 7 and 8 are plan views of the valve housing according to FIGS. 7 and
- FIG. 9 is a view of the valve housing according to FIG. 7 from below.
- FIG. 1 shows in section the part of an injection pump 3 seated in a bore 1 of a wall 2 of the crankcase of a diesel engine, essentially consisting of a pump piston 4, a pump cylinder 5 and a constant pressure valve device with a valve housing 6.
- This Components are clamped against a seat 8 of the housing bore 1 by means of a valve holder 7, a corresponding shoulder 9 of the pump piston 5 engaging in the seat 8.
- a pin 10 By means of a pin 10, the inner end of which enters a groove 11 in the pump cylinder 5, the latter is secured against rotation.
- the pump piston 4 is designed in the usual way, ie it has a control groove 12 which interacts with a first suction bore 13 in the pump cylinder 5, which is fed from the outside via an annular suction space 14.
- the Fuel is fed into the suction chamber 14 by means of a fuel line (not shown) which feeds the suction chamber 14 via a connecting piece 15 and a connection bore 16 connected to the latter and to the suction chamber 14.
- a further suction bore 17 is located together with an overflow groove 18 in the pump cylinder 5 on the side opposite the first suction bore 13; the second suction bore 17 is also connected to the suction chamber 14, which is delimited on the outside by a sleeve 19 made of hardened steel, which delimits the suction chamber 14 on the outside and which protects the housing wall 2, which is usually made of cast aluminum, against the impact of the pump piston 4.
- the sleeve 19 is flush at the top with a sealing surface 20 countersunk in the housing wall 2, which is sealed off from the valve holder 7 by means of an annular seal 21.
- An annular groove 22 in the underside of the valve holder 7, which intersects with the connecting bore 16, ensures the fuel filling in the suction space 14.
- a fuel pressure line 23 which is provided for connection to the (not shown) injection line and which opens with a connecting cone 24 in a nipple 25 of the valve holder 7.
- the valve holder 7 is -.G-
- the valve housing 6 is shown enlarged in FIG. 2. It encloses the actual constant pressure valve device, consisting of two check valves, namely a delivery valve 28 and a relief valve 29, the latter with a significantly smaller valve bore compared to that of the delivery valve 28. Both valves have balls 30 as valve bodies, which are each accommodated in a conical valve seat, the cone angle of which is 60 °. Both balls are preloaded by means of leaf springs 42, one of which is shown in a side view in FIG. 5.
- the leaf springs 42 are curved accordingly and are supported with their opposite ends against the rear wall 31 of a flat chamber 32 in which they are accommodated; In the middle, the leaf springs 42 have a slight indentation 33, which serves as a support surface for the balls 30 forming the valve body. To promote the valve function, it may be expedient to cover the rear wall 31 with a sliding layer to avoid abrasion between the rear wall and the ends of the leaf springs 42.
- the delivery valve is flowed through in the direction of arrow F, the relief valve in the opposite direction according to arrow P. Accordingly, the outlet of the delivery valve 28 is connected via a transverse groove 35 to the inlet of the relief valve 29; furthermore, the inlet of the delivery valve 28 is connected to the outlet of the relief valve 29 via a corresponding transverse groove 36.
- the valve housing 6 is composed of an upper valve housing part 6a and a lower valve housing part 6b, the latter connecting to the pump cylinder 5, the former to the valve holder 7.
- the two valve housing parts 6a, 6b form a common parting line 37, each of which adjoins the conical valve seats or the chambers 32 in which the leaf springs 42 are received.
- the transverse groove 35 in the upper valve housing part 6a is in liquid-conducting connection with the fuel pressure line 23 in the valve holder 7; the transverse groove 26 in the lower valve housing part 5b is in liquid-conducting connection with the working space 38 of the injection pump.
- a bore 34 serves to receive the centering pin 27.
- valve housing 6 is limited to the illustration of the essential components, the connection to the wall of the crankcase being omitted. To the extent that the components correspond to the illustration in FIG. 1, repetitions in the following description are avoided.
- the design of the valve housing 6, on the other hand, is different, which is formed here in one piece. It contains check valves which are arranged eccentrically next to one another and are biased by coil springs 39, in which the valve bodies are also balls 30 which are provided with pins 40 for connecting the coil springs 39. Both coil springs 39 are seated in receiving holes 41 through which each end is connected to the associated valve bore and at the other end to the associated transverse groove 35, 36.
- valve housing according to FIG. 7 As can easily be seen in the enlarged illustration of the valve housing according to FIG. 7, this can be seen as a separate one between the pump cylinder 5 and the valve holder 7 Simply produce the inserted component by drilling the corresponding holes, valve seats and grooves from opposite sides; this applies all the more to the split valve housing according to the embodiment according to FIGS. 1 to 5, where it has been possible to make the individual components particularly small by using leaf springs, so that the clearance spaces are accordingly reduced could be achieved, in accordance with the main aim of both embodiments.
- the juxtaposition of the delivery valve 28 and relief valve 29 in the valve housing 6 has made it possible to shorten the axial overall length accordingly, which also makes it possible to reduce the clearance when using helical springs 39, although not to the same extent as in the embodiment with Leaf springs 42.
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
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE59401166T DE59401166D1 (de) | 1993-03-11 | 1994-03-10 | Verbrennungsmotor mit kraftstoffeinspritzung, insbesondere einzylinder-dieselmotor |
JP51960494A JP3594964B2 (ja) | 1993-03-11 | 1994-03-10 | 特に単気筒ディーゼル・エンジン等の燃料噴射装置付き内燃エンジン |
AU63763/94A AU6376394A (en) | 1993-03-11 | 1994-03-10 | Internal-combustion engine with fuel injection, in particular a single-cylinder diesel engine |
EP94911152A EP0688397B1 (de) | 1993-03-11 | 1994-03-10 | Verbrennungsmotor mit kraftstoffeinspritzung, insbesondere einzylinder-dieselmotor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4307651A DE4307651C2 (de) | 1993-03-11 | 1993-03-11 | Verbrennungsmotor mit Kraftstoffeinspritzung, insbesondere Einzylinder-Dieselmotor |
DEP4307651.3 | 1993-03-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994020749A1 true WO1994020749A1 (de) | 1994-09-15 |
Family
ID=6482474
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1994/000753 WO1994020749A1 (de) | 1993-03-11 | 1994-03-10 | Verbrennungsmotor mit kraftstoffeinspritzung, insbesondere einzylinder-dieselmotor |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0688397B1 (de) |
JP (1) | JP3594964B2 (de) |
AU (1) | AU6376394A (de) |
DE (2) | DE4307651C2 (de) |
WO (1) | WO1994020749A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1477665B1 (de) * | 1999-02-09 | 2008-04-23 | Hitachi, Ltd. | Hochdruckbrennstoffpumpe für eine Brennkraftmaschine |
DE10302043A1 (de) * | 2002-10-31 | 2004-05-19 | Robert Bosch Gmbh | Kraftstoffhochdruckpumpe mit Kugelventil im Niederdruck-Einlass |
JP2006504904A (ja) * | 2002-10-31 | 2006-02-09 | 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 | 低圧入口に玉型弁を備えた燃料高圧ポンプ |
JP4585977B2 (ja) * | 2006-02-20 | 2010-11-24 | 日立オートモティブシステムズ株式会社 | 高圧燃料供給ポンプ及びその組立方法 |
ITMI20131164A1 (it) * | 2013-07-10 | 2015-01-11 | Bosch Gmbh Robert | Gruppo pompa per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna |
DE102017205949B3 (de) * | 2017-04-07 | 2018-09-27 | Continental Automotive Gmbh | Ventilanordnung für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR842969A (fr) * | 1937-09-11 | 1939-06-22 | Anciens Ets Skoda | Dispositif de dégagement de la conduite d'éjection de pompes à injection |
CH212495A (de) * | 1938-08-16 | 1940-11-30 | Messerschmitt Boelkow Blohm | Federplattenventil. |
DE2651586B1 (de) * | 1976-11-12 | 1978-04-27 | Maschf Augsburg Nuernberg Ag | Befestigung eines ringfoermigen Widerlagers fuer die Schliessfeder eines Ventils einer Kraftstoffeinspritzpumpe fuer Brennkraftmaschinen |
DE3424401A1 (de) * | 1984-07-03 | 1986-01-09 | Robert Bosch Gmbh, 7000 Stuttgart | Gleichdruckventil fuer kraftstoffeinspritzpumpen |
-
1993
- 1993-03-11 DE DE4307651A patent/DE4307651C2/de not_active Expired - Fee Related
-
1994
- 1994-03-10 JP JP51960494A patent/JP3594964B2/ja not_active Expired - Fee Related
- 1994-03-10 WO PCT/EP1994/000753 patent/WO1994020749A1/de active IP Right Grant
- 1994-03-10 EP EP94911152A patent/EP0688397B1/de not_active Expired - Lifetime
- 1994-03-10 DE DE59401166T patent/DE59401166D1/de not_active Expired - Fee Related
- 1994-03-10 AU AU63763/94A patent/AU6376394A/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR842969A (fr) * | 1937-09-11 | 1939-06-22 | Anciens Ets Skoda | Dispositif de dégagement de la conduite d'éjection de pompes à injection |
CH212495A (de) * | 1938-08-16 | 1940-11-30 | Messerschmitt Boelkow Blohm | Federplattenventil. |
DE2651586B1 (de) * | 1976-11-12 | 1978-04-27 | Maschf Augsburg Nuernberg Ag | Befestigung eines ringfoermigen Widerlagers fuer die Schliessfeder eines Ventils einer Kraftstoffeinspritzpumpe fuer Brennkraftmaschinen |
DE3424401A1 (de) * | 1984-07-03 | 1986-01-09 | Robert Bosch Gmbh, 7000 Stuttgart | Gleichdruckventil fuer kraftstoffeinspritzpumpen |
Also Published As
Publication number | Publication date |
---|---|
EP0688397B1 (de) | 1996-11-27 |
DE59401166D1 (de) | 1997-01-09 |
DE4307651C2 (de) | 1996-05-09 |
JPH08511845A (ja) | 1996-12-10 |
EP0688397A1 (de) | 1995-12-27 |
JP3594964B2 (ja) | 2004-12-02 |
DE4307651A1 (de) | 1994-09-15 |
AU6376394A (en) | 1994-09-26 |
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