DE1453449A1 - Electromagnetically driven fuel feed pump - Google Patents

Description

. - »■ ■ ί

R. Hr. 8064
6th

/ .
11/27/1963

Mooring for
Patent and
0 usable gauges

ROBERT BOSCH OMBH. Stuttgart W. Breltaoholdstrasse 4

Blektromafcnetlach driven Fuel"

feed pump ■

The invention relates to an electromagnetically driven Fuel Pörderpuep «whose pump piston bit the anchor of a Electromagnet and a spring in counteracting this and forward «work limited by two piston end positions ·· movements is offset. '\

In known pumps of this type, the movement of the pump piston takes place in one direction of movement under the force of the electromagnet in the other direction by the force of the spring. In order to achieve an FSrder · pressure which is generally constant over the course of a PSrderhub, the spring force is generally assigned to the delivery stroke, whereas the magnetic force is assigned to the suction stroke. The well-known

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U53U9

Robert Bosch QrnbK. Lr / In R.Nr. 8064 Stuttgart · 27.ll.i963

electromagnetically driven fuel feed pumps is the * Naohtell together «that the pump stops when the Pump removed. Fuel quantity below a minimum value at tieat en sinks and then stops moving independently - ■ can, if the excitation current of the electromagnet is switched on and off with the help of a switch operated by the pump piston, In this case it is necessary to start by a suaätsllohe device that controls the excitation current. Puapensplel again In. . Bring gear 8U. '.

The invention was based on the object of creating an arrangement su * .V in which these start-up and start-up problems are avoided. This can be achieved by using the · 'erfindungsgeeäea ■ ".. · .'.-". an and * which responds to the respective position of the pump piston. The switching device acting on the supply current circuit of the electromagnet is provided, which maintains the exciter flow in the piston end position reached when the spring is relaxed and keeps it switched on and off there until - to reach the other piston end position reached in the armature position. <y and up to the return of the piston to the first datum position. switches keeps. This creates a position-dependent criterion with '··' a switching hysteresis that is equal to the path of the pump piston · or only slightly less than this. '

Als.lageabhängige, afflicted with a Sohalthysterese criteria - are, preferably, the following arrangements in Betrachts

a) The effect of light on a photoelectric receiver (in particular special photo resistor),. . .

b) action of a permanent magnet on a Hall probe;

o) Change in the feedback of an astable multivibrator ... (In particular a blocking oscillator) such that in a be ^ correct position of the pump piston of the multivibrator, see excited, "

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''''' ^! 'B CWQlNiKL "^;: "'' · ■ · "■'■" ·

Robert Doooh OmbH Lr / I / a R.Nr. 8064 Stuttgart, November 27, X965

while he is not able to do this in other positions of the piston. The output voltage of the multivibrator can be directly or * naoh Passing through suitable differentiators and / or integrators can be used as a location criterion. . . ■

d) Change of an inductance, the old one of one separate generator generated HiXfsweohseX voltage fed will. The benefits of those who are due to a work resistance HiXfe voltage (if necessary »rectified) 1st of the Qröaee of the inductance and thus of the position of the piston addicted.

e) actuation of a so-called ampoule filled with protective gas with

With the help of a magnet and, if necessary, additional reinforcement old help of a transistor. This solution is not contact-free « the contacts are in the closed, old protective gas filled glass ampoule and let sohaltfrefrequencies, of 10 ™ ... XCr circuits too.

Ia case o) and e) has the position-dependent criterion itself a hysteresis. In cases a), b) and d) the hysteresis must be included in the amplifier. The amplifier fulfills this requirement » if it is designed as a switching amplifier (especially as a Schmitt trigger), which also has the advantage » that the rear amplifier stages work in the so-called `` sohalterbetrieb ''.

A particularly simple arrangement results when the position-dependent The criterion only needs to distinguish between two positions, namely a binding and an exhibition. This lets you see achieve that between the moving piston and the electrical sensing device there is little or no aging Intermediate link »e.g. a snap spring or a son appaagnet is switched.

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" ⁴ " H53U9

Robert Bosch GmbH Lr / Lra R.Nr. 8O64 Stuttgart 27.ll.i963,

A very safe and largely age-independent switching option consists, preferably, of the pump Magnetwloklung through an amplifier, with the output of a bistable To connect the multivibrator, which is brought into its one (in) stable position at the end of delivery la, and into its other (out) stable position at the end of suction Switching in the two end positions of the pump piston? can for example, once again, one of the above-mentioned position-dependent Xrlttritn take place. Btaondtr «gttlgntt iit hltrbti dlt optical method similar to the pre-sole a). In this case, the both photo resistances built into the bistable multivibrator will.

As for the suction stroke with the same suction height in all fillings approximately the same time is needed can take the place of the position-dependent Switching the sheet metal magnet on and off. Activation with additional maintenance of the current for occur for a certain period of time. The interruption of the current For a certain duration of the tent, an aonostable takes place in two ways Multivibrator, the triggering of the multivibrator, for example, by one of the above-mentioned let-dependent criteria. The release is held in such a way that it is not needed for a moment of reaching «the end of delivery, but during the entire dwell time of the piston is effective in the delivery end position · The monostable To save on price, the multivibrator can also be switched in such a way that the inductance of the magnet winding is achieved is also used as a tent member of the multivibrator.

As an exemplary embodiment of the invention, one is shown in the drawing electromagnetic fuel feed pump shown. ■

Show Bs »

Fig. 1 is a longitudinal section duroh the pump, ^v

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Robert Boaoh GmbH LrAn R.Nr. 8064

Stuttgart 27 11/1963

Pig · 2 a section along line IX-II in Pig · 1 » Pig. 3 a son of line XXI-III in Pig «2 and Pig · 4 the electrical circuit diagram of the pump. In Pig. 5 - Is a modified example in its axial longitudinal sonltt and in

Pig. 6 shown in the axial plan view of the electrical * switching device «. .

The pump has a feed piston 1 made of magnetizable material, coated with a thin chrome alloy, which is guided to and fro with close play in a lifting cylinder 3 surrounded by the magnet coil 2. The solenoid coil 2 is made of a molded plastic bobbin 4 and a 5 x Magnetwloklung the hub of the bobbin K has a thin-walled Abeohnltt 6 and ^ inen short, thick-walled Abeohnltt 7 "whose Bohrungsdurohmesser is smaller than the Nabenabsohnittes. 6 -

In the thin-walled hub section 6 protrudes a tube 8 made of magnetically soluble material, the height of which corresponds to the diameter of the bore of the thick-walled hood section 7. The upper end of the tube 8 protruding from the magnetic coil is firmly connected to a flange-like washer 9 made of magnetizable material. A magnetizable Kiaenring 10, which surrounds the magnetic coil, is pressed onto the outer edge of this ring disc 9 at one end, the other end with a magnetizable! Washer Ii firmly connected 1st. The bore of this ring disk 11 has the same diameter as that of the tube 8 and the thick walled Nebeüabsohnittes 7 of the bobbin 4 _# The tube 8 "of the Nabenabsohnltt 7 and the ring disk 11 form the 'wall of the hat lyllnders 3" in which the piston 1 is movably guided 1st. .

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U53449

Robort Bosch GmbH Lr / Lm R. No. 8064

Stuttgart 6

The magnet coil 2 together with its magneticohen Rüolceohluae forming metallic cladding 8, 9, 10 »11 is In on from Plastic housing 12 is used, which is tightly closed by a deodorant 12. The Deokel 13 has in his In the middle a pipe socket 14 to which the suction line (not shown) the pump can be connected to «The QehKuse X2 has In the middle of its bottom a pipe socket 15 for the connection of a delivery line drawn below. Pipe socket 14 in the lifting cylinder 5 sits a valve 16 (suction valve) » the fuel from the pipe socket 14 into the lifting cylinder 3 allows the fuel to flow back In reverse Jedooh prevents · The piston 1 1st with an Aohsbohrung serving for the passage of the fuel 17 provided »In which a valve 18 (pressure valve) sltst» the la same sense as valve 16 opens and leaves *

A helical spring 20 endeavors to "hold the piston 1 carrying an annular buffer 1 a against a rubber buffer 1 b seated in the bottom of the housing" until the two buffers strike one another. Here, the upper end level 'of the piston 1 far below dea lower sin de · tube 8, the effective air gap unm indicated by dashed lines course of the magnetic field lines extend a Stttek is aioh sovlt from the lower end edge of the tube 8 to the upper end edge of the piston 1. These two The conical tapering of the tube 8 or the conical widening of the piston bore 17 ..;. ".

, f ' ■ - "· ■ ■ ■ ·

Olelohstrom is available to feed the magnet winding 5, which can be used with the device described below is periodically interrupted.

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EAD ORiQiNAL

U53449

Robort Boa oh GmbH Lr / Lra R. Hr. 8064 Stuttgart 27.II.1965

The pump housing 12 contains, in a bulge on its inner wall, a groove-like recess 2I ₄ in which a support arm 2 * for a rod-shaped permanent magnet 25, which is connected to the buffer for the feed piston 1 via apeloben-like ribs 22, 23, is movably guided parallel to the recess 21 eratreokt aloh In the wall of the pump housing 12 there is a longitudinal bore 26 into which a Sahaltan vial 27 is inserted from above. The holding bulb 87 has a hermetically sealed glass bulb "in the front ends two magnetic holding contacts 28 and 29, which are made of magnetic material, are integral. The hold contacts 28 and 29 are closed under the influence of the magnetic field of the permanent magnet 25 "when the piston 1 and the permanent magnet 25 occupy the lower position shown in FIGS. the 11 niugsbswegumg of the piston * 1 the permanent magnet 25 to a certain wet naoh just versonoben bit

As shown in Fig. 4 of the drawing, the holding contact is obsolete 28 Via a resistor 50 to the base of a power transistor 31 connected «while the hold contact 29 is connected to the Negative pole of a power source not shown is connected. The emitter of the translator 31 lies on the positive pole of the power source. Parallel to the Smitter-Basls-Streoke of the transistor is a Baslswideratand 32 included. The collector of the translator 1st with connected to one end of the magnetic coil 5, the other end of which is connected to the negative pole of the power source. Parallel to the Magnetwloklung 5 let a diode 33 held for the derivation of the voltage peaks induced in the cloud when it is stopped serves.

The translator 31, the resistors 30 and 32, aowle the diode 33 sit on an Xsollstoffplatte 3 * in cover 13 of the pump

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Robert Bosch GmbH Lr / La R.Nr. 8064

Stuttgart November 27, 1963

housing 12. On the raised end edge of the cover 13 there is a closing plate 35 which carries attachment flags 36, 37 and is clamped to the housing 12 together with the cover 13 by spring clamps 38, 39.

When the switching contacts 28, 29 are closed, the voltage drop has at the base resistor 32 the transistor 31 in the current-conducting State controlled so that current flows through the Magnetwloklung 5 flows and therefore the delivery piston 1 against the force of the Spring 20 is pulled upwards, the end of the retraction movement disrupts the field of the permanent magnet 25 dl · Sohaltkontakte 28, 29 on j where the transistor 31 goes into the blocking state and the magnet winding 5 is de-energized · Against Sad · the subsequently Return movement caused by the tension of the spring 20 of the piston 1 soles the contacts 28, 29 again, whereupon the game begins again. ./ .: '' '.

The piston 1 moves under the influence of the. Spring 20 and the field generated by magnet coil 2 free swinging in the lifting cylinder 3 back and forth without doing this to the bottom of the housing 12. The arrangement is made so that the Pull-in force of the magnet moves the piston 1 in the full stroke direction, whereas the tensioned spring 20 then moves the piston in the direction of the delivery stroke · sucks during the delivery stroke the piston fuel above the suction valve l6 in the lift cylinder and at the same time presses part of the below the Dructeventiles 18 located fuel through the connection 15 out of the pump housing. During the subsequent filling stroke. Fuel from the lifting cylinder 3 through the piston bore 17 and the pressure valve 18 into the pump space below the piston 1 repressed. "-

If and as long as the internal combustion engine does not run out of fuel takes from the delivery line connected to the nozzle 15,

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6AD ORiGINAU

Robert Bosch GmbH Lt / Ιλ R.Nr. 8O64

Stuttgart November 27, 1963

piston 1 remains in the delivery line due to the overpressure * in its upper reversal position corresponding to the beginning of the delivery stroke » in which no current flows through the magnetic coil 5 As long as the pump is not delivering, it does not use any Current "But as soon as fuel is withdrawn from the delivery line", the spring 20 comes to the piston 1 after the fuel has been dispensed. would take 1 »miss the delivery stroke sense«

The power consumption of the pump therefore adjusts automatically Delivery rate to · ·.

In the modified embodiment according to FIGS. 5 and 6 are identical or identical parts with the same reference symbols as in the Flg. 1 to 4 · Different from that in these The embodiment shown in the figure is b «l of the fuel feed pump According to FIGS. 5 and 6, a die-cast aluminum Manufactured pump housing 40 with an integrally formed suction port 41 provided »its print room 42 through an on the open end face of the housing attached brass sheet 43 closed Is this against Oeniuses' criminal offense with a Oruokrlng 44 secured by screws (not shown) is clamped. In contrast to the first example is both the Sohaltampulle 27 and the one for opening and Closing their contact tongues 28 and 29 serving permanent magnet 25 arranged transversely to the direction of movement of the pump piston 1. The ampoule is in the cutout of a pressboard The support plate 45 produced in the Briiokrlng 44 is stuck · The according to the visual image are located on the support plate 4 interconnected "for the operation of the transistor necessary resistors 30 and 32" and the Tranaistor 31 and those for suppressing inductive disconnection points Serving diode 33 »which is parallel to the magnet winding 5 1st.

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H53U9

Robert Bosch'GmbH Lr / Lra IWNr. 8θβ4

Stuttgart "27.II.1965

The permanent magnet 25 sits on the one facing the Schaltarapulle 27 Front side of the plastic buffer 46, which is in the Endabsohnitt of the pump piston 1 is pressed in and several contains axially parallel through holes 48 through which at dor retraction movement of the piston 1 the fuel from the cylinder inncnraum 3 conveyed into the pressure chamber 42 and from there via a lateral, for screwing in a delivery line, not shown serving transverse bore 47 can flow off.

When the piston 1 is in the conveying end position shown in FIG stands, the contact tongues 28 are under the influence of them then penetrating magnetic leakage flux emanating from the permanent magnet 25 is closed. Then the transistor 31 can the Strocafluss.o to produce Magnetwieklung 5 and the piston 1 against the Force of the compression spring 20 are moved downwards · The contacts However, they cannot open immediately because they still remain in the stray field of the magnet 25 even during this retraction movement of the piston 1. However, in order to switch off the To achieve contact tongues 28 and 29 are on the outer face the upper flange-like annular disk 9 belonging to the electromagnet has two magnetizable short-circuit angles 50 and 51 provided, between the axially protruding legs of the 4agnet 25 is immersed in its downward tightening movement, The magnetic The stray field of the permanent magnet 25 is transferred into the annular disk 9 and therefore diverted from the switching tongues 28 and 29 as soon as the piston 1 is curled up sufficiently far into the cylinder 3 Has. As a result of the deflection of the stray field of the magnet 25: the two switching contacts 28 and 29 can then open and the transistor 31 to interrupt the flow through the magnet winding 5 Block excitation current.

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H53U9

Robert Bod cn GmbH Lr / Lra R.Nr. 8064

Stuttgart November 27, 1963

Since the Kontaktsungen 28 and 29 in the open state from each other are spread out »nut sieve the permanent magnet 25 Ubor the previously described Ausaobal & tumble out of the ampoule during approach the conveying movement of the piston 1 even further until its stray field can close these contacts again. For axial Limitation of against the Sohaltampulle 2? directed pressure movement of the piston 1 is from the right short circuit angle 51 tine carrion tongue 52 radially bent into a longitudinal groove la Kunstfitoffbuffer 46 engages and thereby ensures «. that the feed pump is switched on every time. can even start.

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Claims (1)

) /. t y ι JjJ)> J J J-- t J H534Ü9 Sober !; JosohTftt «, Stuttgart VL ht / lm R.Hr. 8o64 846 * ht /. 8.4.196 * Claims. ' 1. BlektroBiagnetiioh driven fuel feed pump whose The pump piston is connected to the armature of an electromagnet is and under the force of the electromagnet and one of these counteracting spring in reciprocating, by swei Piston end positions limited working movements is shifted " daduroh gekennet, date a on the respective location dee . Pump piston * responsive and on the supply atroatkreia of the electromagnet acting switching device provided is that in the piston end position reached when the spring is relaxed the Srregerstroa switches on and until atur Brreiohung the other "piston end position reached in the armature pull-out position Holds switched on, switches off there and up to the door Return of the piston to the first distortion switched off holds. . · Feed pump according to claim 1, characterized / that between the moving pump piston and an electrical sensing device acting on the switching device Hysteresis link, especially a snap spring or a son appoagnet is switched on 009813/0297 BAB . ■ it ι ■ ι ii > * - - ■■■ '· ■ "■■ - · ■'" "■ ■ 3 · WrderpTÄpe n »ch Anepruoh 1, dadurob g« k «mxtlohnet, dtw als., V- AblUlil« inrioht \ me and switching device a biaiabiler multiri-> ^: br * tor torgeaeßen iet, atr bti sponsors in the Stro · - the Haeaetwioklung "ioheretellende one" one of the two offer bil positions, in the other piston end division on the other hand in αφ ine other, open operations troi * of the Blektroeagneten interrupting Operating location is brewed. 4. Feed pump naoh claim 1, characterized in that Switching device only dependent on laying when you hold the cinema is actuated by the pump piston, whereas for deff The wake-up process is a specified, calibrate the kinaon wake-up process an analogous time delay is provided 5. Feed pump according to claim 4, characterized in that · * the Time delay is avoided by a monostable itultivibrator, which is brought into its unstable operating position by an electrical sensing device and held in this position by an electrical timer . ' _ ■. ■ ..- ■ i ■ ■ ■ '* ··' ■ '· 6. Feed pump according to claim 5 »characterized! that as Timing element is the inductance of the winding of the electrical power supply ■ [■ is used · ■■ '- ■ _r 7. Funding u »pe naph claim V Ms 6, daduroh core} dmet that 'die 8o |> old propulsion through a photoelectric « * · '. "* · a Fotoifideretand and fine With Mm ι foHfi. (pi * ', i J J IJi .. > J, $ 14 3449 Coupled aperture can be operated, the inside on the receiver. directed light beam intervenes / :. * ■ ·. "■ * '■' ■ * ■; ■." ■ r · ■■■ ■■ - ■ ■ ^'-:. - / 8 «Feed pump according to claims 1 to 6, characterized in that sur actuation of the switching device a Pereanenteagnet and a relatively su these movable, connected to the pump piston Ball probe (Hall resistor or Hall generator) provided 1st 9 · Feed pump according to claims 1 to 6, characterized in that ·· the switching device contains an astable multivibrator, in particular a blocking oscillator, in which a control element coupled to an old pump piston reduces the coupling ratio changes »that · the self-excited oscillation of the multivibrator is switched on as soon as the piston piston has one of its binding positions is achieved and maintained until the KoX exert this division among other things a given, in particular, the distance corresponding to the suction stroke has been removed, however in the other piston end division the vibration . breaks _^"%% 10. FQrderpuBpe naoh claim 1 to 6 » characterized in that the switching device contains an inductance, which is fed with an auxiliary voltage and connected in its size by a nlt de« pump piston «into the power line path of the domestic. * ductivity engaging control element changeable 1st 009813 / 029Ϊ . BAD ORKSiNAL. H53U9 «• fills ·, bit · 1» · ί · tobftMotettliitt «<Ue Kootakttungen 4 »kefmseiobn« t, data der 44 «StbaltajBUll · (87) qu ** for movement · - (I) MfMTdMt Ut, JUMprooh | ti daAnroh gakemue that the JBMB ^ hBjP QIWeBiBrVvwKS ^ MeWM> IStW * flLOKWKVSttiWZa ffvXiTi ** (I) ABelovdi with 1st und quer sor Bed * FwBpWkolfBl polarlalert 1st , dadttroh sekennielehn «t that one opposite the Sohaltaepulle for the long term dsduroh known «elol» et, the · dl · beldereelt. the cylinder bore (3) d «g to) litBN» lBMPaete »ane * ord * te and with the eleentellen dea _5AE) 1 ■ ·) Electromagnet related Kurzsohlueewinkel (50, 51) eat hai t _f swieohen which the permanent magnet (25) in the A · zugsbewegung of the piston (l) is inserted. 009813/0297 Blank page