DE1576514A1 - Pump arrangement for an internal combustion engine - Google Patents

Description

Acton, London, England

Pump arrangement for an internal combustion engine

The invention relates to a supply pump arrangement an internal combustion engine with liquid fuel. In such pump arrangements that use an injection pump are equipped, there is inside the pump assembly : After the injection cycle, there is a high 'pressure, which often causes malfunctions in α he pump arrangement caused.

-i.uf.jabe the invention is therefore to create a simple and practical pump arrangement, oei which the high pressures after the .Jinsprityun _e ; no longer occur.

Urfindungs _o e :: IAE2 this is to ^ coe achieved in iari the pump assembly in a combination νJi. en: Vtroreiinunjsniotor, in dom the pump arrangement is connected, in A ^ -an ^ irität vou dosten speed iingutrieocne EinsLiri tzipum.e, for iie sur connection :: iit an outlet opening during the £ i: ii -ritcuiig xian channels are provided, whereby ^ "." punch the 13iii3_: ritzeru: r.pe and the \ U3 opening a little different according to Ur Jinsori

is arranged, and an g = _c; enücer - i5 _e end of pages ltils Dinriciitungeix "ur.,. el:, ..: j d-ds lisch ^ er existing pressure on a pressure oiler at pressures, which lio ^ en under your pressure, d3r during the injection the injection pump received .vird. The pump arrangement has a rotatable valve body driven by the injection pump as a function of its speed, in which a supply opening for connecting an upstream side of the one-way valve with supply channels and downstream outlet openings and channels for releasing the pressure at the downstream side of the Einwe _e Yentils are provided, and a housing in which the

the supply channel assigned to the supply opening and the as K / bo!
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Passage channels associated with openings formed channels are arranged, according to a further proposal of the invention, in the one-way valve there are bores 2 for the discharge of an adjustable amount of fuel from the upstream side of the one-way valve ;; Provided during the movement of the valve to the closed position and channels for releasing the pressure on the downstream side in the valve body and in the valve. According to aich, the closing and opening of the channels in the housing can be easily achieved by the fact that the rL ^: ~ ni ~ e in a housing are offset from one another and the openings in the valve body are arranged in a plane perpendicular to the longitudinal axis of the valve body Liind, it is possible that according to the number of motor cylinders to be supplied with fuel, the pump arrangement has a plurality of outlet openings with supply channels distributed in the housing which, depending on the position of the rotatable valve body, are alternately connected to the upstream side of the one-way valve. A throttle valve arranged between the feed pump and the injection pump makes it easy to control the amount of fuel supplied to the downstream side of the one-way valve under pressure during the filling cycle. Advantageously, the pump arrangement for controlling and setting the injection pressure has a contactor which is displaceable in a chamber, is pressed towards one end of the chamber and limited in displacement at the opposite end by a stop, the chamber with the upstream side de3 Sinwegeventils During the start of the injection cycle of the injection pump, it is in communication via ducts. A lock is also provided for the contactor, which limits its deflection in the direction of the rotatable valve body. For a setting of the injection pressure that is dependent on the speed of the pump arrangement, the lock is connected to one of the speed of the pump arrangement and the

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closed combustion isor controlled setting device connected «The control of the setting device can be carried out according to a proposal of the invention so that the Feed pump for supplying the injection pump with fuel has valves that control the pressure of the fuel supplied by the feed pump Fuel depending on the speed of control of the pump assembly, and that the adjustment device of the lock has a cylinder piston assembly which is compatible with the by a feed pump, supplied fuel is acted upon. Furthermore, the pressure curve of the injected fuel determined by the spiral spring, against which # £ β = 8ρ * 3? βϊ # β # βϊ «= is stored. the contactor

With the pump arrangement according to the invention, a combined arrangement of feed pump and injection pump is expedient created at which the iiohen pressures, which often cause disturbances, no longer occur after the act of expressiveness »

In the following, the invention is illustrated by means of a drawing showing an exemplary embodiment, from which further details can be found and advantages of the subject matter of the invention result, explained in more detail. Show in detail

Pig. 1 shows a longitudinal section through a pump arrangement and

Fig. 2 shows a cross section through the pump arrangement according to Pig. 1.

The pump arrangement has a housing 10 in which a rotatable cylindrical valve body 11 is arranged. The valve body 11 is dependent on the speed of the internal combustion engine, to which the pump arrangement is connected, driven. At one end of the valve body 11 is a Transverse bore 12 is provided in which a pair of pump pistons

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Locatedo The pump pistons 13 are in the transverse bore 12 like this arranged that they moved v / earth during the rotation of the valve body by drivers 14, which the valve body on surround this end. For this purpose, the driver is ring-shaped and has several inwardly directed and diametrically arranged pairs of notches, which are marked with mounted on the outer end of the respective pump piston 13 Roles working together.

At the opposite end of the valve body is the rotatable part of a vane pump 16 for supplying fuel the injection pump provided. The vane pump has an inlet port and an outlet port in the housing. The outlet opening is with an acas-parallel inflow channel 15 in the interior of the housing connected, while the inlet opening with a further Inlet port is connected to the outside of the housing. During operation, this externally attached inlet opening can be connected to a supply container, which is filled with liquid fuel. Furthermore, the inlet port and the outlet port the feed pump, which is designed as a vane pump, is connected by a pressure valve (not shown) that is designed in this way is that the pressure at the outlet of the feed pump depends on the speed at which the valve body is driven, changes.

A stepped, achial channel 17 is provided in the valve body 11, which at one end Uiit the ^ uerbohrung 12 in connection stands. At its other end, this channel 17 is closed by a plug 18. In the area of this widened end of the channel 17 is a radially extending feed opening 19, which is dependent on the rotation of the valve body and a'owecxisierenden with several, at the same angle In the housing 10 arranged supply channels 20 can come into connection. In operation, these supply channels 20 are

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speaking injectors of the trained internal combustion engine. The V .r bond av / iscnen the supply port 19 and a supply channel 20 occurs before the pump piston 13 to move the Mitnenmers among α he "/irl.ung squats inward. This connection is maintained over a period after uie pump plungers 13 have moved inward to their maximum deflection »

The stepped axial channel 17 is designed to receive a cylindrical one-way valve 21 which is pushed away from the enlarged end of this channel by a spiral spring 22 provided in the enlarged end. The displacement path of the one-way valve under the load on the spring 22 is limited by a step c3 in the periphery of the axial channel 17 Transverse bores directed towards the side walls of the acasian channel 17 opens; when the one-way valve 21 rests against the step 23, the cross bores of the one-way valve are connected to a groove which is let into the axial channel 17 at this point . The hat 24 is also connected to a plurality of inlet openings in the valve body which are directed radially outward at the same angle and which alternately and depending on the rotation of the valve body come into communication with an inlet channel 26 in the housing 10. The axial position of the transverse bores in the valve body 11 are chosen so that during the beginning of the liachinnenbewefcung the pump piston 13, the cylindrical one-way valve 21 is axially displaced against the spring force, urü thereby fuel is pressed from the enlarged end of the axial channel 17 through the supply opening 19 . As a result, the transverse bore in the one-way valve 21 is senoben into the widened end of the axial channel 17, so that the further conveyance of the fuel from the transverse bore 12 takes place via the blind bore and the transverse bore in the one-way valve.

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The inlet passage 26 communicates with the inlet duct ^ o via a groove in the valve body and a throttle valve in conjunction kl, which controls the amount of fuel flowing through aie dun inlet channel.

The throttle valve 27 is by a not shown Controller depending on the speed of the valve body rotatable. There is also a for setting the controller adjustable actuator. In the periphery of the throttle valve is a groove, the position of the groove to an opening in the 7 / and of the housing determines the Amount of fuel that reaches the inlet duct 26.

The mode of operation of the pump arrangement will now be described as far as it is described wurae, assuming that the feed opening has just opened and mic a feed channel 20 in communication has stepped and also that the pump piston 13 is just beginning to move inwards under the action of the cam of the driver to move, described. At the beginning, the one-way valve 21 axially shifted against the spring force by the brake material, which is pressed out of the transverse bore 12 through the pump piston. The axial displacement of the one-way valve 21 causes Fuel from the enlarged end of the axial channel 17 through the supply opening 19 into the with the supply opening 19 in Connected supply channel 20 and conveyed to the connected thereto injection nozzles of the combustion moxor will. It should be noted that during this movement the Inlet openings 25 are not in communication with the corresponding inlet channels 26 due to the further axial displacement "of the one-way valve 21 is the transverse bore of the one-way valve 21 with the enlarged end of the axial channel 17 in Connected, glass the rest of the fuel! from the transverse bore 12 via the blind bore and the transverse bore of the one-way valve 21 can be conveyed to the enlarged end of the axial channel 17. Once the roles

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reach the tips of the cams of the driver, the movement of the pump pistons inward and consequently also the fuel supply to the machine stops. When the rollers have exceeded the tips of the cams of the driver 14 "hot", the * uipenkolben 13 occupy themselves to the outside. The one-way valve is pushed back into the closed position under the action of the spiral spring 22 and the fuel flowing through the transverse bore. This creates a predetermined overpressure in the widened end. The cams of the driver 1J are designed so that an opening period is provided in the movement of the pump pistons outward, so that such movement outward is temporarily stopped. Nevertheless, the movement permitted by the pump piston is sufficient at all times to ensure that the transverse bore in the one-way valve 21 is brought back into connection with the groove 24, which in turn is connected to the inlet opening 25. Immediately thereafter, the connection between the supply opening 19 and the supply channel 20 is interrupted. Before this interruption, however, the connection between an inlet opening 25 and the inlet channel 26 is established.

To make sure that the one-way valve 21 rests against the stage and to reduce the pressure in the transverse bore and in one downstream of the one-way valve located part of the axial channel together with the bore in the one-way valve and to stabilize the groove 24 while the pump "pistons are stopped for a while, these volumes are available in connection with a space in which there is a low pressure. Conveniently, this is the space that is the annular Carrier surrounds. This space is usually attached to the outside of the pump assembly Drain connected. To achieve this, overflow channels Jo are provided in the housing 1o of the pump assembly alternating with several axially parallel extending

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Overflow grooves 51 are connected to the outside of the unifc, ng into the valve body.;:. en are. The uueralW / Tmuten 31 ..χηά.: Ιΐΐ · rtjpreci.er.aGn ^ inn.it'of. i'ramgen; ■: "> connected. The verb inulin-j between the ι. of ■ rr.'trüiiu Uten> 1 and the ^ ..-- .. τ ¹ -ütr'Jj ^ ·: ή" !. οη 3 C: .υ - :: ..; : iur .- ·. *. f ..! ο ■ en time:.: u ;; t iiidc, enn d "r Jinl <s. ^ ic ^; * i-: 1 -δ .nit ^ In'j""..- ix:.:. ... öj. "" :. "i: un · ^ -.> in 7 '-".'. '^ - ii.diJi:, j tr it-jl :: -, r *; rr, er: -inau: j .ird 'lie Veroindun ·; dor Lb' .- rrrürümr.uten 31 i :: it den Z'ü *. "ztv'J: a: bn- „ en JG unü-rbrocutn, ncivor uie connection z-.vicc : -er, the 2ufuhrk'ii: r _: .l ^ C and a Zuj.'uhröffr.ung 19 lower. ^ oeuer; v / ird * Ix: Ie ^. -jtit, v.'än ^ end äor the · l; .., rjtrU:.: iiUteü ^ 1 ... it; icn L, o: - \ ^ Lr '>iriKa; i '- ^; .ien 50 connected, flies; jrennritoff uuer den Eira ^ iCh ^ i iö>; um toorströmicanai. , ilcr nicnts. ■. & :: üC "., eni._or i.-t. .ur jruC :. in ,, on ο ;, η ΰΓ'.ϊ ^ Λ; .ΐβη / Vx: ■ - '■ ii.a, .ui Itn ^ '^^. j ^^ druc ^ stabilized and this 31' ^ tiiisation fivr.iet Ε% · -Λτ ,. -unrend the pump piston 15 in their; -vc _o ^ r. _a nac : au,; on .urch uie Cl'i'nuneSpuriode ö.er UOCi-: en ies ... itnenmers 14 .. η ^ oi.-slten ". ', raeri. i-ioher jjruck in aem extended;:. ^ x; ie aerj c; ~ r: i "len Kanaxc 1 / oewirict in dierjer.i operating point dai the Einwe _o valve 21 is brought in cooperation with the spring on the stage 23 for conditioning Once the erwännte Cffnungsperiode has expired and. If the overflow grooves 31 are no longer in communication with the overflow channels 30, fuel flows to the overbore 12 so that the pump pistons are moved outward. The amount of fuel can be determined by setting a throttle valve.

So that the pressure in the widened end of the axial channel 17 towards the end of the supply opening and during the pumping cycle has a predetermined, relatively low amount at any time, the extended 3nd of the axial canal can be attached to the The outlet of the feed pump. To this end lead from the enlarged end of the axial channel 17 several radially outwardly directed and arranged at the same angle Backflow openings 32, which come through a backflow channel 33 with the inflow channel 15 in connection, while the

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Feed opening 19 is shut off from the feed channel .'0.

In order to be able to determine the curve of the delivery of the fuel as a function of the speed with which the pump arrangement is driven, an adjustable length of fuel can flow out of the widened end of the axial channel 17 at the beginning of the internal movement of the pump piston 13. For this purpose, a cylindrical chamber 40 is provided in the housing 10, in which a contactor i-1 is installed. The contactor 41 is counter-supported against a spiral spring 42 located in the rear part of the chamber. The displacement of the contactor 41 in the direction of the front .END the like chamber 40 is formed by an adjustable from the outside stopper 43 limited The front end of the chamber 40 is connected to the extended end of the aciisialen channel 17 at the same time when the supply opening 19 with communicates with a feed channel. For this purpose, an overflow channel connected to the front end of the chamber 40 is provided in the housing. This overflow channel is arranged in the housing 10 so that at the appropriate time it can come into communication with one end of the above-mentioned return flow opening. Due to this arrangement, the first amount of fuel, which is delivered through the axial channel 17 during the inward movement of the pump pistons 13, flows to the front end of the chamber 40 and the contactor located therein is against the '

Spring force pushed back as far as the adjustable stop 43. As soon as the contactor hits the stop 43, the Fuel injection to the internal combustion engine, as already described, instead of. The rear end of the chamber 40 is connected to the feed pump 16 via a channel 45. As a result, will fuel is supplied to the inlet of the feed pump 16 when the contactor 41 is pushed back against the force of its spring The overflow channel 44 is connected to the return flow opening 32 only for part of the time in which the supply opening is connected to the supply channel 20. Once the feed opening

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If it is closed and while a backpack opening '5'I is connected to the return flow channel 33, fuel can flow from the front end of the chamber 40 into the widened end of the axial channel 17. For this purpose, a return channel 46 is provided, which is connected to the front end of the Ka; .jner 40. This return channel 46 is connected to a return opening 3.2 at the appropriate time, while the contactor under the action of its spring 42 against the front end of the chamber 40 is pressed ",

The deflection of the scnützes in the direction of the front end of the chamber is limited by a lock. The setting this lock depends on the speed of the pump assembly. The lock has a pressurized fluid Piston 47 which is spring loaded in one direction and which is acted upon in the opposite direction with the fuel, which the piston under pressure from the Outlet from the feed pump is supplied. The tool 41 is provided with a transverse bore through which the piston 47 protrudes. In the bore 48 a V / iderlager is also provided, the one with the curved recess in the piston 47 is in mutual effect. The recess can be any expedient Have shape, so that the deflection of the contactor 41 in the direction is limited to the front end of the chamber 40 under the action of the spring 42. The freely selectable shape of the curve in the Cylinder 47 can have any desired pressure curve to be delivered Fuel can be achieved. The time of injection of the Fuel in the engine can be changed in the usual way with this type of pump by making the ring-shaped Driver is rotated in the housing. To this end, a pistons charged with hydraulic fluid are provided » which is connected to the annular driver, the piston being spring-loaded on one side while it is on the the other side is charged with fuel, which is under pressure is branched off from the outlet of the feed pump *

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jot ieθ ßrucK, who im i) mie de;.; ^ insurit ^ tci ^ tes boi hearing-. ^ vU-Mj. iu'ieii idle a ..- ά .. "3" .. · ■ ► c. advised, en en .irt 'btsijoht irnd dor it'uri - alc L "suc: te ϊϋν otoruiijen in the pumpen ^ nurvi / mn ,, i.jt, occurs at u ir • -riintiun ^ s ^ eiiiü.ctiii pumpenanordniuig

Patent claims:

Claims (1)

Claims. (1 ο I pump arrangement for supplying an internal combustion engine with liquid fuel, characterized in that the pump arrangement in combination is an injection pump (1-3,14) driven by the internal combustion engine to which the pump arrangement is connected, depending on its speed »for the Connection ¹ /! In the outlet opening during the injection channels (19, 20) are provided, a one-way valve (21) which can be closed after the injection is arranged between the injection pump (13-14) and the outlet opening, and on opposite sides of the one-way valve (21) has devices (24, 25, 30, 31, 32, 33) for releasing the pressure existing after the injection to a pressure or to pressures which are below the pressure which during the injection by the injection pump (13 , 14) is achieved. 2. Pump arrangement according to claim 1, characterized in that, that the pump arrangement with the injection pump in Dependence on the speed of rotation driven, rotatable valve body (11) in which a feed opening (19) for Connection of a downstream side of the one-way valve (21) with supply channels (20) and downstream Outlet openings and channels (32) for releasing the pressure on the downstream side of the one-way valve (21) are provided, and a housing (10) has in to which the supply channels assigned to the supply opening (13) (20) and the passage channels (33) assigned to the channels (32) designed as passage openings are. '■■■' - ^: BAD 009 815/0905 Pump arrangement according to one of Claims 1 to 2, characterized ■ marked that in the one-way valve (-21) holes for diverting an adjustable amount of fuel from the upstream side during movement of the One-way valve (21) is provided in the closed position and that channels (24 »25 ', 30, 31) for releasing the pressure on the downstream side in the valve body (11) and the housing (10) are present. '. 4. Pump arrangement according to one of claims 1 to 3, characterized characterized in that the channels (20, 30, 33) in the housing (10) offset from one another and the openings (19, 25, 32) f in the valve body (11) in a plane perpendicular to the valve body longitudinal axis are arranged. - 5β pump arrangement according to one of claims 1 to 4, daJLroh marked that according to the number of fuel the motor cylinder to be supplied the pump arrangement has a plurality of outlet openings with supply kai channels (20) which are distributed in the housing (10) and which alternate depending on the position of the rotatable valve body (11) are in communication with the upstream side of the -'Bin-way valve (21). 6. Pump arrangement according to one of claims 1 to 5, characterized characterized in that between the feed pump (16) and the Injection pump (13), (14) a throttle valve (27) is arranged that the downstream side of the One-way valve (21) under pressure during the püllaktes controls the amount of fuel supplied to the injection pump (13, 14) 7. Pump arrangement according to one of claims 1 to 6, characterized characterized in that the pump assembly is one in one Chamber (40) displaceable »in sight of one end of the chamber (40) pressed, at the opposite end ■ limited by an aeti #? Hl *% C4?) Ift of the shift 4 - Contactor (41) and the chamber (40) with the upstream side of the one-way valve (^ 1) during the start of the injection stroke of the injection pump (13, 14) via channels (32, 44) stands· 8, pump arrangement according to claim 7, characterized in that that for the contactor (41) a lock (47, 48) vorgesten is that its deflection in sighting 'on the rotatable Valve body (11) limited. -j. Pump arrangement according to Claim 8, characterized in that the lock (47, 48) is connected to an adjusting device controlled by the speed of the pump arrangement and the connected internal combustion engine. 10. Pump arrangement according to claim 9, characterized in that the feed pump (16) for supplying the injection pump (13 »14) with fuel valves that control the pressure of the fuel supplied by the feed pump (16) control depending on the speed of the pump assembly, and that the setting device of the Lock (47, 48) has a cylinder piston assembly, to which the fuel supplied by the feed pump (16) is applied. 11. Pump arrangement according to claim 10, characterized »that the contactor (41) is mounted against a spiral spring (42). BAD QRlQiNAL 009815/0905 Blank page