DE2242602A1 - DEVICE FOR CORRECTING THE FEED PERFORMANCE PER REVOLUTION OF AN INJECTION PUMP - Google Patents

Description

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3396-72

SOOIBTE INDUSTRIAL GEHERALE DE MECANIQUE APPLIQUEE S.I.G.M.A 89, Boulevard Ire * ne Joliot-Curie, 69 Venissieux, France

Device for correcting the delivery rate per revolution an injection pump.

The invention relates to a device for correcting the delivery rate per revolution of an injection pump for internal combustion engines with a control element that enables the delivery rate to be set per revolution and Can be shifted in a direction of displacement by a control member, this device connecting means between the control member and the regulating member, which by wrapping means, which ai one of the links are bound and define an inner chamber which is in the direction of displacement of the regulating member extends, as well as being formed by closure means which are bound to the other member and extends transversely to the direction of displacement of the control element, ken, the enveloping means and the closure means being displaceable relative to one another, the supply means being a pressure means,

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the pressure of which can change to the inner chamber.

Such a device is shown in the French patent publication No. 824.199, in Elcher the internal one Chamber is connected by a line to a point behind the gas flap of the inlet line. For the wrapping means, guide means are required, which are solid connected to the housing of the pump and provided by the control element for regulating the delivery rate per revolution are different.

She British Patent No. 529,672 shows one Such a device in which the pressure medium supplied to the inner chamber is the pressure oil used to lubricate the engine. There are also guide means for the wrapping means required, which are firmly connected to a housing and are different from those provided for the control element to regulate the delivery rate per revolution

The invention aims in particular to design such a device so that it is better than before corresponds to the various requirements of practice and in particular no longer requires additional guidance, "eiche with a housing, in particular the pump housing, firmly connected and from the guide of the control element for the delivery rate is different.

The invention also aims to reduce the space requirement of the correction device and to design it so that it can easily be connected to any type of regulator asur control of the delivery rate per revolution of the pump can be adjusted

The inventive device for correcting the delivery rate per revolution of an injection pump for Internal combustion engines of the above type is characterized by that the closure means separate said chamber into two tightly isolated parts, the inlet means introduce the pressure medium into one of the parts of the chamber, the pressure of which can change, while the other part of the chamber having elastic return means which are arranged between the envelope means and the closure means and the Counteract the pressure medium, whereby the

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Nen wrapping means (or closure means) carried by this and are designed so that they guide the locking means (or enveloping means) and the control member bound to this closure means (or enveloping means).

The closure means are preferably formed by a flexible membrane, the middle of which is firmly attached is connected to the member not carrying the wrapping means while its periphery is attached to the wrapping means.

The device according to the invention is preferred used on an injection pump of an engine working with pre-compression, its combustion air under pressure through an auxiliary machine is supplied, e.g. a turbo compressor, then that part of the inner chamber of the enveloping means to which the pressure medium is supplied, with the line to Supply of the engine is connected with air, so that the pressure of the air supplied by the auxiliary machine in this part of the Chamber prevails, the training being made so that the correction device increases the delivery rate 3e rotation causes when this air pressure increases, "and vice versa in case of acceptance.

The invention is explained below by way of example with reference to the drawing.

Fig.l is an axial section of an injection pump attached to an injection pump provided with a centrifugal governor rectification device according to the invention.

Fig.2 is a section along the line XI-II the Fig.l.

Fig.3 is a section along the line III-III the Fig.l.

Fig.4 shows a curve, soft work

of the engine represents its injection pump with the rectification device the Fig.l to 3 is provided.

Fig.l shows a device 1 for correcting the delivery rate per revolution of an injection pump Internal combustion engine .. b -. -

The pump has a standard handle 2y which is formed by a straight bar or rack

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which can slide in its longitudinal direction and thus allows the delivery rate to be adjusted per revolution of the pump In Fig.l, when the rod 2 is moved from left to right, there is an increase in the delivery rate per revolution of the pump causes. This increase is indicated by the arrow pointing from left to right, over which the sign "+" is located. In the opposite sense, a reduction in the delivery rate per revolution is obtained. The displacements of the rod 2 are controlled by a control member 3, which is on the rod 2 pushes or pulls on it. The control member 3 is mechanically connected to a lever 4, which is pivotable in its central portion on a pin 5, and its rotation this pin 5 is controlled by a centrifugal governor 6, which is driven at a speed which corresponds to that of the motor fed by the injection pump is proportional.

The correction device 1 is formed by connecting means arranged between the control member 3 and the control rod 2. These connecting means contain enveloping means E which are carried by the rod 2 and define an inner chamber 7, which extends in the direction of displacement D of the control rod 2, as well as closure or separating means S, which are carried at least by the control member 3 and extend transversely to the direction D.

The closing or separating means S separate the chamber 7 into two parts 7a, 7b which are tightly insulated from one another. the Wrapping means B and the separating means S are mutually reversible »

Inlet means A admit a gas, the pressure of which can be variable, into the part 7a of the chamber 7 Part 7b of this chamber contains elastic return means, which are formed by a helical spring β, which between the Wrapping means E and the separating means S is arranged and counteracts the gas admitted into the chamber 7a.

The wrapping means E are covered by a cap

9, which is the extended end of one by two screws 11 forms connecting pieces 10 attached to the rod 2. The concavity of the cap 9 faces the control member 3. the

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9 ^is "fc by a collar 9a, edged, formed between a cover 12 and a threaded into the lid hollow screw is clamped · The concavity of the lid 12 of the cap facing ^v 9 so that the chamber 7 together through the concavities of the cap 9 and the lid 12 is formed.

The control member 3 is formed by a finger which, thanks to a seal 3a, penetrates the cover 12 tightly occurs. The finger 3 can slide in a guide bore 12a provided in the cover and carries a pin 14 'on which a fork head 15 is pivotable The end of the fork head 15 remote from the finger 3 has a threaded blind hole 16, in which the end of a lock nut 1 & fixed threaded bolt 17 is screwed in

The threaded bolt 17 has a shoulder 19 which can lie against the head 2ü of a pivot axis connected to the lever 4. The threaded bolt 17 is extended beyond the shoulder 19 by a smooth shaft 21, which passes through the head 20 and is used to guide one of the The head 20 is used to keep the return spring 22 in contact with the shoulder 19

The separating means S of the chamber 7 are expediently formed by a flexible membrane 23 through the center thereof an extension 3b of the finger 3 occurs to which it is attached is; A shoulder 24 is on the connecting sterile between the larger diameter section of the finger 3 and its extension 3Jb formed of smaller diameter. One on the extension 3b, pushed-on flat perforated disk 25 lies down with one side against the shoulder 24 · The one facing away from the shoulder 24 The side of the perforated disk 25 is used to tension the membrane 23.

A shell 26 with two different zones

Diameter, which has a shoulder for receiving an annular Form intermediate piece 27 is on the extension 3b pushed on the side of the membrane 23, giving way to the part 7b, the chamber 7 faces. '

The end of the extension facing the cap 9 J5J3 is threaded and receives a nut 28, by means of which the membrane 23 tightly between the shell 26 and

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the perforated disk 25 is clamped. The periphery of the flexible membrane 23 is tight between the cap 9 and the lid 12 clamped, which for this purpose corresponding stop surfaces exhibit.

A disk 29 is preferably arranged in the bottom of the cap 9 so that it acts as a stop for the end of the Extension 3b is used. The disc 29 serves as an intermediate layer to adjust the mutual stroke χ between the finger and the wrapping means B. Their thickness therefore becomes corresponding selected the desired stroke.

The spring 8 is arranged between the disk 29 and the intermediate piece 27. The thickness of the intermediate piece 27 in the direction D thus determines the initial tension of the spring To set this tension only a suitable thickness for the intermediate piece 27 needs to be selected »

The means A for admitting a pressure medium, in particular a gas, in which the parts 7a of the chamber 7 comprise a channel 30 with an axis parallel to the direction D, which passes through the bottom of the lid 12 and at one end opens into the chamber part 7a. The other end of the channel 30 is provided with a connector 31, which has a front * Has end piece 31a provided with cracks, which is inserted into a flexible hose 32 made of a material that retains the heat, oil and hydrocarbons. The axis of the Bndstücks 31a is perpendicular to the direction D in a to the plane of Fig.l parallel plane.

The training is designed in such a way that the flexible All tube 32 forms an open loop, the shape of which is clearly shown in FIG occupy, e.-twa in a plane perpendicular to the direction D. lies. The positions of the end piece 31a, which the mutual boundaries of the finger 3 and the wrapping means B correspond, which are obtained when the perforated disk 25 rests against the ceiling L 12, as in Fig.l, respectively. if the extension 3b rests on the disk 29, are to the middle plane of the loop formed by the hose 32 symmetrically *

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The other end of the flexible hose 32 is pushed onto the end piece 33 a (FIG. 2), which is provided with projections, of a connecting piece 33 connected to a source of grass 34. The axis of the end piece 33a is perpendicular to the plane of Fig.l. The loop of hose 32 is protected by a rigid hood 35.

Shut-off lever 36 visible in FIGS. 2 and 3 is mounted on the same rotatable axis 37, as an arm 38, which from the outside of the by the desire and the pump-formed arrangement containing housing is accessible and enables the shutdown of the engine.

The inventive Beriehtigungsvorxichtung is suitably used for a working supercharged diesel engine, is supplied with combustion air from nelchem the auxiliary machines, such as a blower or _a: turbo compressor, which are driven by the exhaust gases of the engine. The gas source 34 for supplying the portion 7a, [the chamber 7 is then formed pressor through the fan or the Turbokom- ■, and the chamber part 7a feed gas is air, whose pressure is equal to the supplied to the engine combustion air.

Pig.4 is a graphic representation of the

(plotted as ordinates) delivery rate per revolution Q of an injection pump for internal combustion engines with pre-compression which is provided with the correction device according to the invention, the chamber part 7a of which is connected to the output of the auxiliary machines supplying the combustion air, as explained above. The abscissa in Pig. 4 is the pressure P of the air supplied to the engine with precompression. The graphic representation of Pig.4 has four curve sections C ₁ , Cg »C ,, C. *

Section C- is practically one to that

Abscissa axis parallel straight line section with ordinates Q ₁ and ends at a point with abscissa P ^. The section C ₁ is extended by an inclined straight line section which forms an angle ec- with the abscissa axis, j and whose end remote _{from the section C 1 the coordinate}

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2242802

Th Q ₂ and P _{2 have formed} "the section Cj WiFi extending the section Cj WiFi by a parallel to the AbseisBenachee" section, deasen from the section ^ distant ^ volumes di · A ^ fiiüe t ₅ ha ** fer Afeifhnitt P ^ we * ftffiwfe a "* cut nil negative slope" formed,! deep "? the 0. extended in the direction of the abscissa axis; t ~

Pie erfii »#ii» g »sfp | • rpwittt foig # ndtr »» iieaf fit? · Die

assumed that ee pie »around a pit '■? ΡΨΨ fr # ifl ^ iilHf Motor bandelt * and that the source for delivery dea in fawiertiil. 7§, acting »ii» ee dull fiüfn ## n Ifelf? "If ϊ" | $ f |> il send turbo compressor is formed.

If the I * i * ftlmgk i "i" .ImpfFt0l |> Tf f W Äff * wln4nni; A tr effect of the spring # not gq «pf £ 0? If, Η '*** #ischeibe ^ 5 supported on the feekel 12. The ffanff 2 fi) l |; - | Terechiebun ^ s of the Pingera 3 _? If # «F io * i> F pit f # || ail; t # t _ff tolfifet the finger 5 mn |» ewieglieft _f md ^ # i # | f rotation of the puepe iet same% (ffMw fig ·!) ·

When the I4 & $ dfUeiF erptf ^ iit in de "iümf _: r | #i Wffirt-tj (fig, 4), the one from the | ^ r" 9k on the membrane 25 UfMi the lid | 2 is out $ e Kraft fl # i # tl #ff VfH #er fedef θ developed. If the I # £ tji | -ue.! C continues to Euninrnt, % if $ - the ffiff f subamged, and ee a mutual movement occurs between the finger 5 m & dea * »fll» nge «i * t #! Il I mf , W * m 4 # f ■ Hot ^ r ei * follae * er ^ ei * # *, tole-iH # «r f.iis» gfF 3 uiil>#»# gliflif and wtiiii the air pressure in the camera part 7a zuimat, will the

in 49V sense of increasing the delivery rate | # with. The straight line section G ₂ of FIG. _{4 is then described f}

'The reciprocal movement zwlehe middle E and the finger 3 stops ^when 4ίΦ' extension 3b an oer £> CfieiD6 / m anscnj. & CLX · ΐΛΐ, ββ lex ogp irfii-j. » nenn uer i / rucK in the chamber te 11 Jg, equals f ^ pif4 «>'fi# Ffr ## f1L # | f | -iU || g | e pm» rotation then equals § ^ (Fig. 4). At full load, the finger 3 remains immobile and the delivery rate per revolution of the pump remains practically constant. PIg.4 is then described »

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When the pressure of the pre-compression air reaches the value P, which is the interruption speed of the regulator 6 / corresponds, this causes a rotation, the lever 4 in the opposite » Clockwise, so that the finger 3 presses on the rod 2 in the sense of a reduction in the delivery rate per revolution, with this can be made zero if necessary. Section G. of FIG. 4 is then sought after,. . . ,

The setting of the value P _{1 of} the pressure of the

Pre-compression air, from which the correction device begins to intervene, takes place by setting the initial tension of the spring 8. This setting of the initial tension is preferably carried out by setting the. Thickness of the intermediate layer:, 27 and, if necessary, by adjusting the thickness / the disc 29, The "thickness of the disc 29 is actually mainly used to adjust the greatest mutual stroke χ between the finger 3 and the cover 12. The adjustment of the Hubes χ allows you to set the. Difference Q «- Q ₁ .

The slope of the section Gg ^ i.e. the angle ot> can by choosing a spring 8 of suitable rigidity, to be determined. , ..-.

The point at which the invention.

Correction device 1 is attached is for the achievement a good regulation particularly advantageous, since the adjustment the rack 2 required forces relatively small compared to those that would be necessary to operate the controller 6. .

The parasitic resistances introduced by the flexible conduit 32, one end of which is the displacements of the lid 12 follows, are due to the chosen arrangement small amount. The pipe 32 experiences only a slight bend and a slight twist, which, the characteristics of the rectification device not affected,. ...-.-,,,

The engine can be switched off by pressing the rod 2 in the direction in which the conveyance is canceled by means of the shut-off lever 36 (Pig. 2 and 3). . , _; ,

Except for the well-known Be: richtu _v figa- _; , devices provide advantages, soft, the

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per revolution of the injection pump by the pressure of Vorverdichtungsluft control of the engine so that flue gases are avoided as the largest capacity per revolution only eingestellstv, when the pressure of Vorverdichtungsluft for a fully "■ ■: ■ combustion of the injected fuel is sufficient , has the ; The device according to the invention requires very little space and can be adapted very easily to all types of controller 6 due to its direct attachment to the rod 2.

Of course, which gas could which del working? Correction device 1 controlling chamber part 7a supplied by an auxiliary compressed air source, such that additional power from the engine can be obtained by any means at will (work through all or nothing)

According to an implementation statement, the Chamber part 7a of the atmospheric pressure prevail, so that then the correction device depending on the change in delivery rate Rotation of the pump in function of the external air pressure. According to another variant of the embodiment, as in the chamber part 7a, acting pressure medium can be used instead of a gas, such as air, a liquid.

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Claims (9)

2242802 P at eη ta η ep r ü ο ti e Device for correcting the rotation of an injection pump for internal combustion engines with a control element which enables the fo ^ derleistuiig per rotation to be set and which can be displaced in one direction of displacement by a control element, the device having connecting means between the control element and the control element, which by _{Enveloping means r} which are bound to the gines of the links and define an inner chamber which extends in the direction of displacement of the regulating member, as well as being formed by closure means which are tied to the other member and which extend transversely to the direction of displacement of the regulating member, wherein the enveloping means and the closing means are mutually displaceable, the supply means supplying a pressure medium, the pressure of which can change, to the inner chamber, characterized in that the closing means (S) divide the chamber (7) into two parts (7a) which are tightly insulated from one another , 7b) tren The inlet means (A) and one (7a) of the file of the chamber introduce the pressure medium, the bridge of which can change, while the other part of the chamber has elastic return means (B) which between the envelope means (E) and the Closing means (S) are arranged and counteract the pressure means, the wrapping means (or closing means) bound to the sail member (2) being carried by the latter and being designed in such a way that they guide the closing means (or wrapping means) and the closing means attached to them (Or enveloping means) bound control member (5) cause. 2) - correction device according to claim 1, characterized in that the separating means comprise a flexible membrane {23) , the central part of which is rigidly connected to the member (3) not carrying the enveloping means (E), while its periphery is attached to the enveloping means (E). 3) - Correction device according to. Claim 2 for injection pumps in which the control element is formed by a longitudinally adjustable rod, characterized in that, that the wrapping means (E) at one end of the rod (2) 309810/0820 -12 - 3396-72 are formed, are brought and by a cap (9), / whose circumference between a cover (12), the concavity of which is opposite to that of the cap (9), and a threaded part screwed into the cover (13) is clamped, the inner chamber (7) being formed by the concavities of the cap (9) and the cover (12), wherein the flexible membrane (23) is clamped at its periphery between the cap (9) and the cover (12), wherein the control member a finger (3) which passes through the membrane (23) and to which the central portion thereof is fastened is, with this finger (3) passes tightly through the lid and slides in a guide hole (12a) provided in this 4) - Correction device according to claim 5 »characterized in that the Hückholmittel by an between the cap (9) and the free end of the finger (3) arranged helical spring (8) are formed. 5) - Correction «device according to claim 3 or 4i, characterized in that an intermediate piece (29) adjustable thickness at the bottom of the cap (9) opposite the end of the finger (3) for adjusting the amplitude (x) the mutual displacement between the finger and the Cap is arranged " 6) - reporting device according to claim 4 or 5, characterized in that an intermediate piece (27) adjustable thickness between the spring (8) and a shoulder carried by a cup (26) attached to the finger (3) arranged to adjust the initial division of the spring (β) is. 7) - Pneumatic correction device according to one of claims 1 to 6 for injection pumps for engines with pre-compression with auxiliary machines, e.g. a turbo compressor, which supply the engine with combustion air under pressure » characterized in that the part (7a) of the chamber (7) of the enveloping means (Έ) to which the gas is supplied under pressure is connected to the line for supplying the motor with air is, whereby the design is made such that the pressure of the flushing air of the motor prevails in the chamber part (7a), and that an increase in air pressure an increase in delivery rate 309810 / OfOö - 13 - 3396-72 determined per revolution. 8) - Correction device according to one of claims 1 to 7 for linspritζpumpen of engines, characterized in that the pressure medium is fed to the chamber part (7a) through a flexible line (32) which forms an open loop, the center plane of which is approximately perpendicular to the the direction of displacement of the rod (2), wherein the G-gene renzstellun- are the opening for the supply of fluid to the chamber part symmetrical to this center plane * 9) ■ * ■ * Correction device according to one of the Claims 1 to 6, characterized in that the design is such that the pressure supplied to the chamber part (Ta) is proportional to the atmospheric pressure. 1O) - correction device according to one of claims 1 to 9 »characterized in that 3ie are designed iet that they are connected to an injection pump of an internal combustion engine can be attached, which is equipped with a control member (3) actuating centrifugal governor (6). ι ^4H ■ Blank page