DE1763712A1 - Train to carry out work on tracks - Google Patents

Description

22 July 1968

Dtp! - Ing. Egon Prime

Dr-Gertrud Hanser Dipl.-big. Golffried Quieter

Patent attorney

• MO Manch · * - »Mfeg

Ernsbargcrstrasi 19 Our reference: L 792

Gas C «

Maurice 3SMAIEE

15, avenue de la Bourdonnais, Paris / France.

/ i

Train to carry out work on tracks.

The invention relates to railroad tracks

moving trains to carry out various work on these tracks, in particular renovation work, such as cleaning an old bedding, the removal of a track, the laying of a new track or the creation of an additional one Bedding »

Such work suits generally include a tractor, a work car and, if necessary, a “Schmutawagen”. The tractor, which is mostly of the diesel-electric design, has traction motors attached to the drive axles and a power generator with its control and transmission devices. The tractor tows the train during the

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Transports from the shed to the work site.

The work cart itself has motors to drive the tools and a power generation unit with transmission and control devices * Certain types of work wagons themselves cause the tools to be shifted along the track during work.

The current technology thus requires two power generating sets with transmission and control, which never work at the same time * The efficiency of the built-in power is therefore very mediocre and the price of the devices is unnecessarily high.

The invention aims in particular to remedy these acronyms.

The train according to the invention for the execution of

Working on tracks with one with a generating set equipped diesel-electric tractor to which a work vehicle with at least partially driven by electric motors Tools is attached, is characterized in that it has a switching device which allows during the Work of the train a part of the electrical power supplied by the power generator of the tractor to the motors of the work car to transfer while the best of the performance sur supplying the traction motors of the tractor.

This inventive combination of agents increases the utilization coefficient of the generating set the tractor, which is used both during work and during the traneport. This avoids the installation of a second power generation unit and the corresponding transmissions on the work vehicle, and the costs

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the arrangement are considerably reduced.

The apparatus for power switching preferably contains in the circuit dec generator of the generating set a provided on the tractor switches, ti; -. ■ £ .. en contacts during transport closed ciiiü, and a ra provided on the trolley shoulder whose contacts during work ever. ohlc; . \ - 21: are.

According to a preferred management authority

is the work trolley with an auxiliary feed unit provided, which has a controller with speed presetting is equipped. This unit supplies the traction motors of the tractor with the necessary to move the train at slow speed performance required during work.

According to a special embodiment of the

According to the invention, the work train has an automatic control system which allows the slow travel speed during the work in puncturing the slope of the track and opposing a tool of the arbeixsvajens Moments to regulate.

One of the most essential uses of the invention is the cleaning of tracks, which consists in removing and closing the bedding. seven. In this case the work vehicle is a bedding machine, and its main work is a bedding excavator. The slow travel speed of the Zujc is then controlled by the resisting honeycomb exerted on the excavator.

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

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Pig · 1 is an overall view of a cleaning train.

Pig. 2 schematically shows the general arrangement of the above cleaning train according to the invention.

Pig. 3 shows the electrical equipment of the above train in a single-wire diagram.

Pig * 4 is the corresponding exact circuit diagram.

Pig. 5 is one embodiment of the invention corresponding work diagram.

Pig. 6 is a working diagram according to a preferred embodiment of the invention.

Pig. Fig. 7 is a schematic sectional view of the low speed vehicle control device.

Pig. 8 shows schematically part of the previous one Contraption.

In the embodiment described below, the application of the invention to a work train is with a ballast cleaning machine for renewing the bedding of a track is shown.

The tractor 1 can be seen in FIGS. 1 and 2

with their electric traction motors 2 and the cleaning machine 3 »which in particular have an overburden excavator 4, a sieve 5, conveyor belts 6 and a conveyor belt 7 for removing the dirt. During the work, the excavator's cups run under the previous ones thresholds of the track 10 raised for this purpose, as shown schematically in FIG.

The tractor 1 has a diesel engine 8,

which drives a main DC generator 9 and the exciter 11 thereof (FIGS. 3 and 4). The cleaning machine 3

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has a motor 12 for driving the excavator 4, a motor 13 for driving the sieve 5 and motors 14 for the conveyor belts. In addition, drives an auxiliary motor 15, which in the preferred Embodiment of the invention is an electric motor, but can just as well be a thermal engine, a direct current generator 16 and its exciter 17 (Pig. 3).

The circuits of the tractor 1 are connected to a control cabinet 20 of the circuits of the cleaning machine 3. From the more detailed scheme of the Pig. 3 it can be seen that the main generator 9 either with the traction motors 2 of the tractor by the switch 18, the contacts of which are closed during transport from the shed to the work site or vice versa are, or with the working motors 12, 13, 14 of the cleaning machine through the switch 19 »its contacts 19a during the Work are closed, connected. The switch 19 also has a second pair of contacts 19b, which is also closed during work and the output circuit of the auxiliary generator 16 connects to the traction motors 2. The electrical connection between the tractor and the cleaning machine is established by connections 21 and 22.

The general way of working is easy to understand: For the transport of the train from the shed to At the workplace, the switch 18 is closed while the switch 19 is open. The one driven by the diesel engine 8 Main generator 9 feeds the traction motors 2. The motors of the cleaning machine are not in operation.

While working (state of Fig. 3) is

switch 18 open and switch 19 closed · The main generator 9 then feeds the motors 12, 13, 14 on the one hand

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the contacts 19a which drive the various parts of the cleaning machine and, on the other hand, the generator 16 driving motor 15 · This latter generator supplies the power required for the traction motors 2 via the contacts 19b and the connection 22, whereby the slow advance of the train takes place during the work.

From the above it can be seen that

thanks to this training, the diesel engine 8 and the generator containing generating set is constantly used, which achieves good profitability and the installation of a second similar unit on the cleaning machine is avoided.

The gain achieved according to the invention in built-in performance is illustrated by the following example of a modern Ballast cleaning machine makes it clear that it can clean to a depth of 0.20 m with an average feed speed of 650 m / h. The ones for the excavator The power required for the sieve, the conveyor belts and the accessories is of the order of magnitude of 1000 HP, while the power required for the slow drive while working is 200 hp. The entire built into the cleaning machine power is therefore 1200 hp. Furthermore, the tractor needs the cleaning machine itself as well as a train of about 30 with waste can haul filled open trolleys at 30 km / h. the corresponding power is also of the order of magnitude of 1200 hp. In this case, the inventive Device to save a power generation unit on the cleaning machine, the performance of which is the same as that of the unit the tractor is.

The applications of the invention to the control problem will now be described in more detail below.

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Again viewed from the outside of a bed cleaning train will.

In the case of a ballast cleaning machine, the

The power absorbed by the excavator accounts for most of the power required The resisting Konent encountered by the excavator is extremely variable because the bedding has a very different hardness under the track. It is therefore essential that the drive motor of the excavator with constant Power works, its speed changing in puncture of the resisting torque. These operating conditions correspond now completely those of the traction motors of the tractor, and the invention now provides for the engine of the excavator of the to use the control system of the traction motors on the tractor. This saves a controller, with the same side all available power is used and any overload is avoided

As is well known, there is a Leonard unit

with a direct current generator 9 and a series motor, two types of control, to which first for a better understanding is remembered.

With the so-called internal regulation one leaves

a characteristic curve of the generator 9 corresponds to each position of the control device of the diesel engine 8. The characteristic curve of the generator S is referred to below as the curve which represents the voltage U at the terminals of the generator as a function of the current I supplied by it for a given value of its excitation current. In the diagram of FIG. 5, in which the coordinates are the voltage U at the terminals of the generator and the current I supplied by it, form those of each position of the

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The control device of the diesel engine corresponds to ideal curves, constant power, a host of equilateral hyperbolas H ₁ ... H. On the other hand, the various external characteristics corresponding to the excitation of the generator form the family of curves C. .... C. In this control system, for each position of the control device of the diesel engine corresponding to a hyperbola H, the excitation of the generator is set so that the corresponding external characteristic curve C- touches the hyperbola H at X. The power of the diesel engine is only fully utilized when the resisting torque is so great that the operating point corresponds to the point of contact X. For every other value of the resisting torque, the operating point comes to a point M on the characteristic curve C, and the power of the diesel engine is not fully utilized, the power loss corresponding to the hatched part of the Pigur.

The so-called external control system aims to

to reduce this loss of performance. In this system (Pig. 6), for a given position of the control device of the diesel engine corresponding to a hyperbola H, the controller changes the excitation of the generator in puncture of the resisting torque in such a way that the operating point practically remains on the hyperbola H. If the resisting torque is so great, for example, that the operating point at M "is on the characteristic curve C and the resisting torque decreases, the operating point on the characteristic curve C seeks to shift in the sense corresponding to a decrease in the current intensity and towards M ¹ come. You are then above the hyperbola H ^, the diesel engine is overloaded and tries to run more slowly. This decrease in speed of the diesel engine generates the excitation resistance of the generator

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ifä 'controlling. Servomotor a reduction in the excitation, which'- äen ^; The operating point after M ₊₁ brings »ie practically, to the intersection of the hyperbola H with a new characteristic curve C ₊ ^. Working with a variable moment is then represented by a stepped curve nestling against the hyperbola H, the steps of which are smaller and more numerous, the more control positions there are on the exciter resistance. ■

The change of the excitation characteristics of the generator takes place e.g. by means of a 3-ohm resistor with servomotor, which is formed by a resistor with contact buttons, its rotatable contact arm by an oil-operated adjusting mechanism is operated, which is controlled by the linkage of the cone of the diesel engine.

The invention now provides the P eidwiderst and with servomotor of the tractor 1 to control the excitation of the Generator 9 to use even if a prevailing one Part of the electrical power of the generator for cleaning the bedding is used.

One sees in Fig. 4 the corresponding assembly scheme for the Pail an external control, which so both for the transport of the train as well as for the work of the ballast cleaning machine is used. In this figure are the same parts of the pig. 3 corresponding parts with the same Reference numerals denoted. The terminals of the exciter 11, whose field circuit contains a voltage regulator 26 * are with the Field windings 25 of the main generator 9 over a height of

Resistors 32 and a field resistor 28 with servomotor 28a tied together. The servomotor 28a is with the desire 30 daa diesel engine 8 connected by the linkage 29. Sine in the bedding

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ίο- Π63712

cleaning machine, 3 built-in control / orriehtyAg 5; t with §Riff 4§ controls iteilÄt ^ Än-iÄei which are not shown on the one hand the controller 30 of the litselffliQtors β and on the other hand; borrow from switches 27 »" which the resistors 32

Done during the transportation of the luges? the ' Regulation in a manner known per se in the following tarz; in* Remembered sage

When starting the field resistance becomes 28

switched off by the alloy 30 and the servomotor 28a, and there is an internal regulation. Each position of the control device 31 determines, on the one hand, one of a power hyperbola H

corresponding given speed of the diesel engine 8 and other corresponding ones on the other hand, a characteristic curve O ^ given via the switch 27 !;

Value of excitation of the main generator 9. ^,. niV

~ ^; In normal operation, all repetitions are

turned off, and the resistor 28 is turned on. Any change in the resisting torque which occurs at the traction motors 2 during the transport of the train results in a change in the rotational speed of the diesel motor 8, the position of the control device 31 remaining unchanged. The reeler 30 then actuates the servomotor 28a, which changes the position of the field resistor 28, whereby the operating point is brought from the characteristic curve 0 to an adjacent characteristic curve C _{n +} ^ has assumed the same speed, ie when the operating point is again at the same power hyperbola H _n

During the work of the ballast cleaning machine, the majority of that is supplied by the main generator 9 Power absorbed by the engine 12 of the excavator

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-Is: - According to the invention, the regulation in the gl; ^r ii go way and by the same organs, such as during transportation of the train, wherein the filled during the transport of the traction motors 2 task erfüllt.wird during work of the engine 12th As you can see, not only is there a need for a power generator on the cleaning machine, but also control elements such as the switch 27, the field resistor 28 and its servomotor 28a.

In the case of low-power arrangements, the tractor 1 only needs to have an internal control system. In this case , at a given position of the control device, the operating point (Fig. 5) remains on the same characteristic curve C ″ of the main generator 9 The efficiency is less important for small outputs. The main advantage of a regulation of this type is - apart from its low price - that the diesel engine is never overloaded with any type of bedding. The curve C is always below the hyperbola H. Hereinafter, the control of the feed is langeanen speed of the train during the working system cleaning _t: smaschine described. The invention provides for the above-described characteristics of the external regulation to be used to control the slow train speed by the value of the resisting torque occurring on the excavator and by the changes in the driving resistance.

For this purpose, the auxiliary generator 16 is the one required for the traction motors 2 during work Power delivers, with a standalone regulator for its

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Provided excitation, which is controlled by the regulator of the diesel engine via an adjusting mechanism forming an amplifier will.

You can see in Pig. 4 the field winding 35 of the auxiliary generator 16 connected to an electronic regulator 33. The regulator 33 also receives the output voltage of the generator 16 at its terminals a and b_, and its terminals c. and d are connected to the terminals of a shunt 36 which is connected in series to the protective circuit of the generator 16. The regulator 33 of known type maintains a constant ratio K between the voltage at the terminals of the generator 16 and the current supplied by it. The controller 33 also has a panel 40 for adjusting the speed of the traction motors 2, to which a handle 63 is attached, which allows the value of the ratio K to be changed. Under the usual conditions of use of the controller 33, the handle 63 is operated by hand. In the described application of the invention, the handle 63 is connected to the controller 30 of the diesel engine 8 via an adjusting mechanism 34 which forms an amplifier and a changeover switch 61, which are described further below. The adjusting mechanism 34 is also connected to the control device 31 of the diesel engine. The switch 61, which one? the sense of the transmission of the movement from the adjusting mechanism 34 to the handle 63 changes, is actuated by an auxiliary power source, not shown, in whose circuit a limit switch of the field resistor 28 is connected.

The device works as follows.

When the value of the on board 40 by the

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Grip 63 remains fixed at the set speed, the controller 23 stops a constant ratio between the voltage across the terminals of the generator 16 and the current supplied by it upright, which causes the loan traction motors 2 to rotate at a constant speed . ■ '

When the resisting moment on the motor 12

of the excavator becomes so large that the operating point according to M- (lig.6) comes beyond the point of contact X- in the sense of increasing currents; from M _n to M 'and then to M _{n + 1} . The diesel engine is then overloaded and its speed decreases. The decrease in the speed of the diesel engine is transmitted to the actuating mechanism 34. This rotates via its changeover switch 61, which is in the direct clutch position in this operating range, the handle 63 of the panel 40 in the sense of increasing speeds. The towing speed of the train is then increased by the controller 33.

Know the operating point is the point of contact X «.

(]? ig. 6) in the sense of decreasing currents the 3? eld resistance 28, which is in its position of the greatest resistance is its end contact, which is the Change of position of the switch 61 causes.

If the operating point is beyond the

If the contact point X * is in the sense of decreasing currents, eg * at N (Fig. 6) and the resisting torque continues to decrease, the operating point initially comes to IV temporarily. The diesel engine is then underloaded, since EP is below the hyperbola H _n , and its speed increases. The controller 30 operates

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then the servomotor 28a of the field resistor 28 so that the operating point comes _{to H n + 1.} At the same time, the controller 30 transmits the increase in the speed of the diesel engine to the actuating mechanism 34. The actuating mechanism 34 is operated in the opposite direction to that of the case examined above, but since the switching block 61 is held in the position of the reverse clutch, the handle 63 is in turn driven in the sense of increasing pulling speeds. Thanks to the combination of the adjusting mechanism 34 and the changeover switch 61, a decrease in the resisting torque on the excavator always creates an increase in the pulling speed.

The control of the slow train speed by the resisting moment allows the best utilization of the power of the diesel engine and the full utilization of the regulation of the main generator 9.

If in the absence of such control

After the excavator has reached a stable operating state, it encounters a less hard bedding, the controller 30 of the diesel engine brings the operating point from M _Q to M _{n + 1} (FIG. 6). The motor 12 of the excavator receives a weaker current under a higher voltage. So Sr delivers a smaller torque and its speed increases · The cup chain runs faster, and since the pulling speed has not been changed, the cups are only partially filled. Conversely, if the bedding becomes harder, the cup chain runs slower and the cups overflow

Thanks to the above controls combine

on the other hand, the feed speed of the train and the speed the cup automatically so that for the available power and the hardness of the bedding is always the greatest requirement.

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c. In the preferred embodiment of the invention, in which the drive motor 15 of the auxiliary generator 16 is an electric motor fed by the main generator 9, the control device also adapts the slow train speed to the track profile or the towed load.When the driving resistance increases, that of the motor 15 increases absorbed current strength, whereby the operating point (Fig. 6) is _{shifted on the characteristic curve C n of} the main generator 9 in the sense of increasing currents. The regulator 30 of the diesel engine reacts in the manner described above and causes the train speed to decrease via the control device.

7 shows an embodiment of the adjusting mechanism 34. This includes a hydraulic booster 39 proportional and differential action, which is controlled according to the invention by a centrifugal governor 42, and its Output shaft 75 the handle 63 of the adjustment panel 40 of the above-described glider for the slow pulling speed over the Switch 61 and a coupling 62 described below are rotated. The governor 42 is driven by the shaft 41 a gear 79 set in rotation. The shaft 41 is in turn by a device not shown with one to the Speed of the diesel engine 8 driven proportional speed.

The invention also provides for the output shaft 43 of the centrifugal governor 42 to be connected to a spring 44, which in turn is connected to a plate by the linkage 46 45 is connected, the position of which is controlled by a cam 47 which is firmly connected to the operating lever 4Θ of the control device 31 of the diesel engine.

Dtr hydraulic Terstarker 39 contains a

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first stage 52 with a piston 54 and a slide 53 displaceable in a cylinder 78. The cylinder 78 is provided with a oil supply line 76 and with the two sides of the piston 54 connected by channels 64 and 65. The slide 53 is with the output shaft 43 of the centrifugal governor 42 is connected by a lever 49 pivotable at 51.

The piston 54 engages via the lever 55 pivotable at 56 on a second gate winder stage 57, which contains a slide 58 connected to the oil supply line 76, which controls a hydraulic motor 59 formed, for example, by an Ilügel-W pump through the channels 66 and 67. The engine 59 sets the output shaft 75 in rotation · The second intensifier stage also contains a steamer device with a Piston 71, which is provided with a return spring 72 and through the linkage 73 is connected to the lever 55. The two sides of the piston 71 are connected to the slide 58 through two channels 68 and 69 connected. The operation of the gate direction is as follows: When the diesel engine 8 is overloaded and slow down searches, the speed of the shaft 41 decreases, and the weights of the Centrifugal governors 42 approach each other and move the slide 53 in the direction of arrow f. The channel 64 is hereby exposed what a movement of the piston 54 in the The direction of the arrow £ and a corresponding displacement of the slide 58 in the direction of the arrow h causes. The oil then arrives to motor 59 through passage 66 and output shaft 75 is rotated. As stated above, the position of the switch 61 is determined so that the handle 63 in the Sense of increasing speed is driven.

Among other things, generated by the response time of the system

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To prevent vibrations, the slide 58 also guides the oil to the side 77 of the piston 71. This then moves in the direction of the arrow 1 , compressing the each 72. This gives a differentiating effect which, as is well known, suppresses the vibrations when they close the proportional effect described above is added.

If the driver of the train has the performance of the

Diesel engine 8 by actuating the control device 31 by means of of lever 48 changes, squat 47 adjusts plate 45 and the linkage 46 'thereby changing the tension of the peder 44 will. This change in voltage keeps the change caused by the change in speed of the diesel engine on the haters of the bowler 42 exerted centrifugal force the equilibrium.

The clutch 62 allows the automatic control device to be switched off and to manually seek out the slow train speed which is the most advantageous operation of the Excavator guaranteed for a given bedding. Then the clutch 62 is switched on and the automatic control fits the train speed to the changes in the bedding "

■ Pig * 8 shows a simple embodiment

of the switch 61. The output shaft 75 of the hydraulic booster 39 sets a bevel gear 81 in rotation, which with one or the other of two bevel gears 82 or 89 in Engages, which slide in hats 83 of an output shaft 84 and are rotatably connected to this. The shaft 84 is with the handle 63 to adjust the speed of the gate the clutch 62 connected. A fork 85, each leg of which is hinged to the baths 82 or 89, is pivotable about a hinge 86 and carries a soft iron mass 87 ″ at its end

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Electromagnet 88, its coil over the end contact of the field magnet 28 is energized, the cash register 87 attracts * A spring 91 pulls the fork 85 back when the electromagnet is not energized will. Furthermore, in a manner known per se, the end contact of the resistor 28 is designed in such a way that it then changes the position each time changes when it is actuated by the slide of the resistance, and between two actuations remains in the position in which he was brought. It is operated e.g. by a system with a ratchet and ratchet wheel.

It works as follows: Assuming that the electromagnet 88 is not fed and the contact of the resistor 28 is open, the spring 91 retracts the fork 85 which brings the had 89 with the wheel 81 into engagement. When the shaft 75 of the booster 39 rotates in the direction of the arrow j, this has a rotation of the output shaft 84- in that direction of the arrow k result. When the field resistance 28 comes into the position of the greatest resistance, the slide of the closes Resistance 28 the end contact, which then remains closed until the slide actuates it again. The electromagnet 88 is fed and pulls the Hasse 87 against the stooping force the spring 91 on. The fork 85 pivots about the joint 86 and brings the had 82 with the had 81 into engagement. In this new one When the amplifier 39 rotates the shaft 75 in the direction j, the output shaft 84 rotates in position the opposite sense gu

The invention can of course be modified. The ballast cleaning machine 3 can be replaced by any other work machine traveling on the Glies, the tools of which are driven by electric motors. The den

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■■■ .- ■ - 19 -

Auxiliary generator 16 for the electric motor driving the slow drive 15 can be powered by a diesel engine or other thermal engine be replaced. Furthermore, the switches 18 and 19 can through other switching elements are replaced, e.g. by power rectifiers with control grids. The servomotor 28a and the field resistor 28 can be controlled by an electronic device the excitation of the main generator 9 can be replaced.

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Claims (1)

Claims 1.) Train to carry out work on tracks with a dieeel-electric tractor with a power, generating unit and a work carriage, in which at least one of the tools is driven by electric motors is, characterized by a Umsohaltvorriohtung (18, 19), which allows, during the work of the train, a rope of the ▼ on the power generator belonging to the tractor (1) (β, 9) supplied electrical power to the motors (12-15) of the work vehicle (3), while the reads the power serves to feed the traction motors (2) of the tractor (1). 2 ·) train according to claim 1, characterized in that the device for switching the power in the the generator (9) of the power generating unit of the tractor (1) with the electric circuit connecting the traction motors (2) a switch (18), the contacts of which are closed during the traneport a and in the circuit connecting this generator (9) to the motors (12-15) of the work car (3) there is a holder (19) »whose tontakte (19a, 19b) are closed during work are, contain " 3 ·) eye according to claim 2, characterized in that the Leiatungsameonalter (16, 19) from the work cart (3) can be controlled from · ti s 4 ·) Train make claim 1, characterized in that the work vehicle (3) is an auxiliary unit with a motor (15) and iron generator (16), which »the traction motors (2) the tractor (f) for the slow Yoraohub during provides the performance required for the work 5) Pulled according to claim 2 and 4, characterized 109839/0043 BATHROOM OBlGSNAL shows that the auxiliary generator (16) with the traction motors (2) the tractor (1) is connected by a circuit (22), which is controlled by the same switch (19) as the connection (21) between the generator (9) of the tractor (1) and the motors (12-15) of the work vehicle (3). β ») train according to claim 4, characterized in that the auxiliary generator (16) of the work carriage (3) of a motor (15) of this work vehicle (3) fed by the generator (9) of the tractor (1) is driven. 7 ») Train according to claim 1, characterized in that the control device (28a) used for driving the train of the generator (9) of the tractor (1) also the working of the Working vehicle (3) causes at least one motor (12) from this generator (9) is fed. 8 ») train according to claim 7, characterized in that the work carriage (3) has a control device (31) Has Eegelgriff (48), which the Hegler (30) of the diesel engine (8) the tractor (1) controls, 9 ·) Train according to claim 1, characterized by an automatic system (33, 34), which the slow train speed the tractor (1) during the Arbelt corresponding to the one (12) of the tools of the work vehicle (3) opposite resisting moment controls "10 ·} Train according to Claim 9» characterized in that that the control system (33 »34) applies a Hegel law corresponding to the external control type 11.) train according to claim 9 »characterized in that that the generator (16) of the auxiliary unit with a Hegler (33) with a part (40) for presetting the speed 10 9 8 3 9/004 3
■. ". ■ 'BAD GPJSiMAL the traction motors (2) of the tractor (1) is provided, and that the control system for the slow train speed comprises a hydraulic booster (39), which through a part (42) is controlled, the position of which is a function of the speed of the diesel engine (8) of the tractor (1), and whose output member (75) controls the file (40) for presetting the speed. 12 «) train according to claim 10 and 11, characterized in that the connection between the hydraulic Amplifier (39) and the part (40) for presetting the speed by means of a mechanical switch (61) for transmission the movement is established 13 ·) Train according to claim 11, characterized in that the control member of the hydraulic booster (39) is a centrifugal governor (42), which with an au the speed of the Diesel engine (8) is driven proportional speed. 14.) Train according to claim 13 »characterized in that the position of the centrifugal governor (42) by the position of the manually operated control device (31) of the diesel engine (8) the tractor (1) is controlled 15.) Train according to claim 11, characterized in that the hydraulic booster (39) has a proportional and a differential effect. 16.) Train according to claim 12, characterized in that the position of the switch (61) for the transmission of motion is changed when the excitation of the generator (9) of the power generation unit of the tractor (1) is the smallest. 17 ·) Train according to claim 4, characterized 10 9 8 3 9/0043 Blank page