FR2533522A1 - TRACTOR WITH ADDITIONAL PROPULSION DEVICE - Google Patents

Abstract

TRACTOR EQUIPPED WITH AN ADDITIONAL PROPULSION DEVICE. AGRICULTURAL TRACTOR INCLUDING AN ENGINE, AT LEAST ONE PTO SHAFT AND AT LEAST THREE WHEELS, CHARACTERIZED IN THAT HAS ONE OF ITS ENDS, THE TRACTOR HAS ON EACH SIDE AT LEAST ONE DRIVE WHEEL 33, WHILE HAS IT OTHER END AT LEAST ONE DRIVEN WHEEL 60 IS PLACED SENSITIVELY IN THE MIDDLE OF THE TRACTOR.

Description

The invention relates to a tractor, in particular a tractor

  agricultural, comprising an engine and a plurality of wheels.

  The current development of tractors, particularly in the

  mechanization of agricultural work, goes in the direction of increasing

  of their own weight, and thus the ground pressure in the wheel tracks increases so much that not only the

  structure of the soil is deteriorated, but that also the power required

  for training needs to be bigger and bigger.

  The invention aims to eliminate these disadvantages.

  According to the invention, the tractor comprises one or more PTO axes and has a power drive motor

  approximately 100 KW and the tractor weight is approximately 3,500 kg.

  The available power on the PTO shaft can

  to be used for the propulsion of the tractor -

  According to one aspect of the invention; between the front wheels and the rear wheels, fitted with tires, the tractor has been fitted with an all-metal propulsion device which may be

  driven by the tractor drive motor.

  According to another aspect of the invention, there is arranged between two rear wheels or two wheels before a wheel which can be

  independently trained.

  The invention furthermore relates to a tractor with at least two front wheel steering and drive wheels, further comprising, near its vertical longitudinal plane of symmetry, a wheel

  which can also be driven by the drive motor.

tractor.

  The invention also relates to a tractor, in which a PTO shaft has been arranged near its front end which can be driven at a speed proportional to the speed of the forward movement of the tractor or to the engine speed. drive.

  The invention furthermore relates to a tractor provided with a device

  hoisting head having a plurality of rollers by which coupling points of the hoist can be moved

in height.

  Other objects and characteristics of the in-

  will be apparent from the following description, which

  refers to the attached drawings representing, as

  non-limiting examples, some forms of

  According to these drawings: FIG. 1 is a side view of a tractor according to the invention; Figure 2 is a plan view of the tractor according to Figure 1;

  FIG. 3 is a front view of the trac-

tor according to FIGS. 1 and 2;

  FIG. 4 is a plan view of the

  rear section of the tractor with a variant of the

rear wheels;

  FIG. 5 is a side view of the trac-

  to which at least one tool has been attached, both at the front and at the back; Figure 6 is a plan view of the agricultural machine according to Figure 5; FIG. 7 is a side view of the

  rear part of the tractor, with machines

  on a larger scale; Figure 8 is a plan view showing the detail of the coupling between the lifting device of the tractor and tools, which are coupled to it; Figure 9 shows a side view of another combination, which consists of the tractor and a tool;

  FIG. 10 is a side view of the trac-

  equipped with a security frame;

  FIG. 11 is a plan view of the trac-

according to Figure 10.

  The tractor shown in the figures

  comprises a frame 1, which is essentially

  killed by a horizontal hollow beam 2, cylindrical which extends in the direction of advance A of the tractor and which forms the lower part of the chassis on the

  beam 2, are arranged two support members 3 spa-

  transverse to the direction A of the advancement and which, by their outer ends, are integral with rectangular protection plates 4 and parallel to the direction of advance A and whose upper edges

  are attached to the lower edges of the upper structure

  5 of the U-shaped frame (see in particular Figure 2) The frame portion 5 is an assembly

  relatively light tubes, since it is not primarily

  intended to carry a cabin 6 (omitted in Figure 2 for clarity) as shown in

  2, the structure 5 comprises two tubular longitudinal members

  7, lateral and connected to their extremities -

  rear tees by a horizontal tubular crossbar 8.

  The assembly formed by the reference elements from 1 up to and including 8 is in relation to the longitudinal vertical symmetry plane of the tractor, indicated in FIG. 2 with the reference numeral 9. The axis of the chassis beam 2 is located therefore, in the plane 9 As shown in FIG. 2, a drive motor 10 is disposed on one side of the plane 9 and rests on the carrier members 3 The motor 10 is

  a light air-cooled engine of one

  About the plane of symmetry 9, opposite to the motor 10, is arranged a reservoir of

  gasoline 11, which also rests on the supports 3.

  Near the front of the tubular beam 2 are fixed

  firmly on the side faces of the beam

  two rigid supports 12, which extend from the beam 2, at an angle of about 450, obliquely upwards and forwards and their upper ends are fixed against the underside of the casing 13; a combined box

  differential speeds arranged in front of the end

  front side of the beam 2 The horizontal underside

  The housing 13 is disposed substantially at the top of the engine 10 behind the outgoing axis of the engine 10 is disposed at the rear of the engine and is coupled to the incoming axis of a gear transmission 14 , arranged in

  a rigid housing that extends from the motor

  only upwards and towards the plane of symmetry 9 and which is below the rear of the cabin 6, substantially perpendicular to the cross-member

  tubular 8 The arrangement of the transmission casing

  The gearing 14 originates from the fact that the motor is offset laterally relative to the plane 9 and is located as low as possible relative to the chassis 1 in order to lower the center of gravity of the tractor. causes, via the transmission gear 14, an outgoing axis 15, located in the vicinity of the plane of symmetry 9 and which projects both rearwardly and forwardly The end of the axis 15 which projects into rear, forms a PTO axis and the part of the axis

  which protrudes forward rests in a tube 16 extending

  under the crankcase of the gearbox 13

  that near the front end of said housing and its end projects to the front of the tube 16 to also form a PTO shaft 17 PTO axes 15 and 17 can be rotated at a speed proportional to that of the motor The tube 16 is located under the gearbox 13 and in front of the gear transmission casing 14 The rear of the tube 16 is fixed rigidly against the front of the casing of the gear transmission 14 and is secured through a support 18, to the underside of the gearbox 13 The front of the upper structure 5 of the frame frames the gearbox housing

  differential 13 and the tubular cross member 8 of the

  Frame 5 is as shown in Figure 2.

  a short distance behind the rear of the engine 10. On one of the lateral sides of the crankcase

  gearbox 13 is attached a training box

  19 having a rearwardly directed outgoing axis driving a mechanism housed in a downwardly extending gearbox. An outgoing axis 21 of the

  gearbox 20 can therefore be driven in rotation.

  at a rate proportional to the speed of advance

  Tractor steering The outgoing axle 21, located near the

  lower part of the gearbox 20 is pro-

  leans forward, out of the box 20, in a tube 23, carried by the support 8, to form an axis of

PTO 22.

  The tube 16 is in two parts contiguous res-

  respectively on the front and rear faces of the gearbox 20 and the shaft 15 passes through the box In the box 20, the shaft 15 carries a gear wheel

  which drives the gearbox 13 through

  other gears, independent of those who

  are driven by the outgoing shaft of the engender-

medley.

  On the upper surface of each of the lanyards

  tubular portions 7 of the U-shaped frame portion are spaced one behind the other, a plurality of

  elastic supports 24 made of elastomer or rubber

  rubber, on which the tractor cab rests 6.

  The tractor cab 6 comprises, next to the driver's seat and the steering device described in more detail below, control members for driving the wheels and, preferably, also control members for engaging and disengaging the vehicles. PTO axes 15, 17 and 21, 22 using couplings not shown As shown in Figure 1, the cab 6 has side walls,

  provided with windows whose lower edge 25 of the frame

  extends forward and upwardly, so that the windows of the rear wall of the cabin can extend to the vicinity of the chassis part 5 and thus the driver has a

  good view of the rear of the tractor

  25 ends at the front at a short distance

  above the top of the box

  its 13, so that the driver has a good view of the front of the tractor through the front window of the cabin 6. As seen in FIG. 1, the front window of the cabin finishes approximately right above the front of the cabin. the gearbox 13 The lower delimitation of the panes in the sidewalls ends in the

  backwards in an angle 26, which rises obliquely

  before passing through a window

directed upwards.

  A small distance behind the front of the housing of the gearbox 13 are fixed rigidly against the lateral sides of this housing, tubular carrier members 29 arranged symmetrically with respect to the plane 9 The ends of the two carrier members 29, opposite the housing of the gearbox 13, are at the height of the front ends of the longitudinal members 7 of the frame portion 5 Near these ends, the members 29 are integral with gearbox housings 30 described in more detail below. lower casings 30 are connected tubular supports 31, which extend from the casings 30 downwards and slightly forward so that their axes form an angle of about 80 'with a horizontal plane The tubular supports 31 can rotate about their axis as will be explained below, with respect to the housings 30 A at their lower end, the supports 31 rigidly carry orga The wheel bearing members 32 are tubular and extend in the

  shown in Figure 3 and which corresponds with the

  rectilinear cement, horizontally and transversely to the advancement A direction As shown in Figure 3, each wheel carrier 32 is disposed symmetrically with respect to the vertical plane parallel to the plane 9, passing through the axis of the corresponding support 31 to each of the two ends of each wheel support 32, is fixed at least one front wheel 33, so that the tractor comprises a total of at least four front wheels, arranged in a transverse row in the direction A forward The diameter of each front wheel 33 is approximately 1.3 m, while the width of its tire is about 40 cm The high points of the wheels 33 are substantially at the upper face of the engine 10 The contact surface of all the wheels 33 with the ground therefore extends - (see Figure 3) over a width of at least l, 60 m or, if disposed

  more than four front wheels, over 1.60 meters.

  The differential, located in the housing 13, has two outgoing axes, which extend into the tubular carrying members 29 and which drive gear transmissions, arranged in the housings 30, in such a way that axes, located in the supports 31, in turn drive bevel gears transmissions arranged in the wheel bearing members 32 and whose outgoing shafts are coupled to the front wheels 33 of the member 32 considered The axes of rotation of the front wheels 33, which are driven by this in a manner coincident with the axes of the wheel-carrying members 32 The supports 31 rest in the housings 30 in such a way that they can rotate, with the corresponding wheel-carrying member 32 and the corresponding front wheels 33, about the axis supports 31 which coincide with the axis

  drive axes of the wheels 33 located in the

  1 At their upper ends, the supports 31 are integral with levers 34 which extend obliquely forwards and inwards and which, at their end opposite the supports 31, are articulated to steering rods 35. , which extend from the levers inwards and with respect to the direction A of advancement obliquely towards the rear to articulate on the rear vertices of a triangular direction plate 36 (FIG. 2), which rotates about a substantially vertical axis 37 fixed by

  compared to the chassis 1 The articulation axes

  at both ends of the steering rods 35 and the axis 37 are preferably parallel to the support pins 31 At the rear end of the steering plate 37 is also hinged the end of the piston rod of a hydraulic cylinder 38 (Figure 2), while the end of this cylinder pivots about a substantially vertical axis carried by the party

  5 and one of the housings 30 The hydraulic cylinder

  38 is located a short distance behind one of the housings 30 and can be controlled from the cabin 6 In the plan view according to Figure 2, the steering rods 35 intersect the line perpendicular to the plane 9 joining the housings 30, while that the joints of these steering rods with the steering plate 35 are behind this junction line Apart from the steerability of the front wheels 33, these wheels are arranged on a bearing structure 29, 30, 31, 32, which is fixed relative to the frame 1 The distance g between the rocket shafts and the drive motor 10

  is about equal to the diameter of the front wheels.

  The front ends of the PTO shafts 17 and 22 are situated (FIG. 1) substantially in the plane defined by the axes of the supports (or rocket axles) 31, at the level of the upper part of the

  front wheels 33 and inside the carrier structure

  31, 30, 31 of the front wheels 33, which has the shape of an inverted U In the profile view, the cabin 6 extends substantially to the vertical plane passing

  by the axes of rotation of the front wheels 33.

  The rear of the hollow beam 2 is substantially perpendicular to the rear part of the cabin 6, this rear end of the beam 2 is indicated with the reference numeral 39 Against this end is abutted a cylindrical tubular piece 40 whose front end is closed by a strong partition welded along the inner circumference of the part 40 On the front face of this partition is welded a cylindrical tube 41, which is introduced to

  friction in the beam 2 and which extends

  that at the front of the latter Thus the assembly formed by the tubular members 40 and 41 rests in the beam 2 so as to rotate freely, the

  axes of the elements 2, 40 and 41 being in coincidence.

  Against the front of the tubular beam 2 is welded a partition 42, provided with a central hole allowing

  a bolt 43 to pass freely to come

  2 of the tube 2, engaged with a internal thread in a partition disposed in the front end of the tube 41 and which at its circumference is welded against the inner circumference of the tube 41 The bolt 43 prevents the backward movement of the piece 40 by relative to the tube 2 and makes it possible to adjust a certain contact pressure between the front end of the tubular piece 40 and the rear end of the tube.

beam 2.

  Against the rear end of the tubular piece

  40 is welded a tubular bar 44, which extends transversely to the direction A of the advance and which, if the tractor is arranged on a horizontal plane,

  is arranged symmetrically with respect to the plane 9.

  Each of the two ends of the bar 44 is located approximately in the vertical plane of symmetry of the outer front wheel 33, located on the same side of the plane 9, or a little outside thereof Close to the outer ends of the bar 44, are disposed against its rear face, removable carrying members 45 which

  are screwed on the bar 44 with four bolts.

  The carrying members 45 extend towards the rear and

  are also directed a little obliquely down.

  Near the rear end of each carrier

  is fixed an axis 46 of rotation, which extends parallel-

  at bar 44 and which is on both sides of

  the carrier member 45 considered around each end.

  mity of each of the two axes of rotation 46 is mounted at least one rear wheel 47, so that each member carries two rear wheels 47, arranged on the side and

  else of the carrier member 45 considered (Figure 2).

  The fixing of each pair of wheels 47 is such that each of these wheels can freely rotate by

  compared to the other wheel in the pair.

  substitute shown in Figure 4, it is possible to screw the two bearing members 45 against

  bar 44 at a location more inward

  and fit on each axis of rotation 46, a single rear wheel 47 and in such a way that it is

  disposed in the path of the outer front wheel 33.

  The four front wheels 33 are arranged like the four rear wheels 47 in a transverse row with a forward direction A and the arrangement

  two rows is such, with the exception of the possibility of

  bility according to Figure 4, that each of the outer front wheels 33 is disposed between the rear wheels 47, located on the same side of the plane of symmetry 9, the vertical plane of symmetry of each carrier member 45

  coinciding substantially with the plane of vertical symmetry

  In addition, each of the inner front wheels 33 is disposed, seen from the front, approximately between the plane of symmetry 9 and an inner rear wheel 47. This appears in the view from the front of the tractor according to the invention. 3, which shows that the wheels are in contact with the ground over practically the entire width of the tractor, so that the weight

  tractor is spread over the entire track width.

  The total size of the row of wheels-behind 47

  is counted transversally to the direction A of the advance-

  approximately 3 meters All wheels have the same diameter of approximately 1, 3 meters and the width of each

wheel is about 40 centimeters.

  The rear wheels 47 with the bodies

  45, the bar 44, the tubular piece 40 and the tube 41 can pivot freely as a whole about the axis of the beam 2 relative to the frame

  of the tractor and also with respect to the front wheels 33.

  Against the rear face of the bar 44 it has been fixed

  and symmetrically on either side of the plane of symmetry 9 a pair of attachment lugs 48 between which can pivot a lower lift arm 49 about an axis 50 parallel to the bar 44 The lift arms 49 s 'extend from the ears 48 backwards and slightly outwards In the profile view, the axes 50 are siutes near the front

wheels 47.

  On both sides of the plane of symmetry 9, there are fixed rigidly on the cross member 8 of the frame part 5 two rearwardly spaced arms 5, which are spaced at a small distance and which at their rear ends are adapted to receive pivoting manner an upper tie rod 52, which forms with the lower lifting arms 49 a three-point lifting device 53 (FIG. 7). The upper tie rod 52 comprises a hydraulic jack, which can be controlled from the cab 6 and by which the tie rod 52 can be

lengthened or shortened at will.

  Between the upper ends of two substantially vertical supports 54, which are spaced from each other and fixed on the upper face of the bar 44 on either side of the plane 9 (FIGS. 1, 7) rests on an axis 55 which extends parallel to the bar

  44 Each end of the axis 55 carries, rigidly

  pivotally, a support arm 56, directed rearwardly from the axis 55 and whose length

  approximately 40% of that of the lower lifting arms

  The rear end of each carrier arm 56 is hingedly connected by a downwardly directed link 57 about the middle of the carrier arm.

  corresponding lower lift On the axis of articula-

  58 of the support arm 56 and the rod 57, pivots the end of the piston rod of a hydraulic cylinder 59, which can be controlled from the cabin 6 and which itself is articulated on the bar 44 of the corresponding axis 50 By actuating the two cylinders 59, the lower lift arms 49 can

  be forced up or down.

  Between the inner rear wheels 47 of the tractor is arranged a propulsion device

  entirely metallic 60 which is part of the tractor.

  The device 60 comprises a tooth roller 61 which can be driven in the same direction of rotation (arrow B in FIGS. 1, 7) as that of the front wheels 33 The roller 61 rotates about a substantially horizontal axis of rotation 62 which is arranged transversely to the direction A of the advance and which, at its two ends, rests in vertical plates.

  the 63 connected rigidly to one another by means of

  its parallels 64 and 65 perpendicular to the plane 9 and which are situated respectively behind and in front of the upper part of the roller 61 (FIG. 7). This frame 63-65 can oscillate with the roller 61, as a whole, around axes 66, which are located in the extension of one another (Figure 2) and in alignment with the axes 50 The frame 63-65 and the roller 61 are located,

  in the plan view, between the lower lifting arms

49.

  The roller 61 comprises a metal cylinder

  67, which rotates about the axis of rotation 62 and on which are fixed teeth 68 directed outwards In the longitudinal direction of the axis 62, are

  divided five crowns of teeth and, for each

  The rigid teeth distributed circumferentially are formed in pairs of one piece of material. The teeth are directed from the cylinder 67 outwards and relative to the direction of rotation.

B, backward.

  Near the middle of the front bar 65 are fixed ears 69, between which is articulated the end, directed rearward, of the piston rod of a hydraulic cylinder 70 The cylinder itself oscillates about an axis disposed between lugs 71 fixed rigidly on the upper face of the bar 44 and the tubular piece 40 By controlling the cylinder

  from cabin 6, the propulsion device

  60 may be driven into the ground or brought

to the top.

  Against one of the side plates 63 is attached a gear transmission 72 which has at its upper part an inward axis, which projects forward and which can be coupled, by means of an intermediate shaft 73 provided with universal couplings, to the rear PTO shaft 21, which as it has

  been said can be trained at a speed proportion-

  the speed of travel of the tractor.

  The gearing 72 is such that the tangential speed of the teeth 68 corresponds substantially to that of the driving wheels 33, and is slightly larger, so that teeth 68, which grip

  in the ground, participates in the propulsion of the tractor.

  As an extension of the incoming axis of the transmission

  Gearing 72 is provided with an outward axis 74, which forms a whole with the incoming axis and which can be coupled, using an intermediate axis 75, provided with universal couplings, to tools, which are

  coupled to the lifting device 53 (Figure 7).

  The PTO shaft 15, which can be driven at a speed proportional to that of the

  motor 10, can be coupled using an inter-

  76, provided with universal couplings (FIG. 7) to tools, which are carried by the device of

three point lifting.

  At the front of the tractor is fixed against the housing of the gearbox and differential 13 two flanges 77 arranged on either side of the plane of symmetry 9 and extending forward Around a pivot 78, disposed between the flanges 77 near the front of the upper edges of the latter at the level of the

  upper face of the gearbox 13, are

  two fixing plates 79, which extend approximately to the lower part of the gearbox 13. At the front of each of the fixing plates 79 are arranged two axes 80 perpendicular to the plane 9 (FIG. 3). and which are located at

  distance one below the other.

  Means of the two axes can rotate freely in total four rollers 81 These rollers 81 are engaged in two almost vertical bars 82 having a U-shaped section,

  presenting their openings opposite and, which are

  placed one next to the other on either side of the plane 9, all in such a way that these bars 82 can slide upwards and downwards by

  relative to the other part of the tractor on the rollers 81.

  At their upper ends the bars 82

  are connected rigidly by a cross member 83, perpendicularly

  on the plane 9 and, below, by a cross 84.

  In the position shown in FIG.

  bars 82 project about half their length.

  below the underside of the box of

speeds 13.

  Between the fixing plates 79 is arranged a hydraulic jack 85, substantially vertical, which at its lower end is articulated on a pivot 86 carried by the plates 79 and whose upper end

  of the piston rod is articulated on a solid support

from the crossing 83.

  Between the flanges 77 is disposed a substantially horizontal hydraulic cylinder 87, articulated at the rear on a pivot 88 and whose front end of the piston rod is articulated on a pivot 89 carried by the fixing plates 79 The axes or pivots

  78, 86, 88, 89 are perpendicular to the plane 9.

  At the lower part of the bars 82 is fixed a horizontal transverse bar 90, which runs on either side of the bars 82 and extends from the front to the outer sides of the wheels.

front inner 35.

  At the ends of the bar 90 are attached coupling members 91 directed downwards and provided with

  automatic hooking means such as the

  driver can harness a tool from the cab.

  In the middle of the bar 84 is disposed a coupling member 92, located in the plane 9 and which forms with the coupling members 91, a three-point lifting device 93 The coupling member 92

  also has an automatic closure.

  By actuating the hydraulic cylinder 87, the driver can modify, from the cabin 6, the inclination of the bars 82, while the control of the hydraulic cylinder 85 makes it possible to adjust the entire lifting device in height, so that from the cab, any position of the lifting device 93 can be reached without the need to leave the cabin, for example to adjust the length of a high lift arm or to couple such arm A device such as the device lifting 93 can

  be placed also at the rear of a tractor.

  The lifting device 93 is located at

  distance in front of the front wheels 33 and in the direction A, a very small length The upper coupling point 92, in the active position, is located approximately at the high points of the wheels

before 33 (FIG. 3).

  According to the arrangement shown in FIGS. 5 and 6, the front lifting device 93 and the rear lifting device 53 are fixed with one or more machines or tools. The entire assembly according to FIGS. agricultural

  whose tractor is the source of energy.

  In the combinations of machines and tools, which are shown in FIGS. 5 and 6, a front milling device 93, which includes a horizontal axis 95 (about 3 meters in the example), has been fixed to the front lifting device 93. shown), transverse in the direction of advance A, and along which are distributed milling bodies 96 This active portion of the milling cutter 94 is covered over its entire length by a protective plate 97, in an arc of the axis. 95 can be driven through a gear box 98 disposed near the middle of the cutter 94 An incoming shaft 99 of the gearbox 98 is connected by an intermediate shaft 100, provided with couplings universal, at the front end of the PTO axis 17 or, optionally, to the axis of PTO 22 of the tractor, which, as mentioned above, can be driven at a speed proportional to the speed of rotation of the tractor engine 10 for

  the axis 17 and the forward speed for the axis 22.

  The cutter 94 is driven in direction C (FIG. 5) and therefore serves as a propulsion device, which borrows its energy from the power of the spindle.

PTO used.

  The axis 95 of the soil cutter 94 is supported

  by side plates 101 The two side plates

  101 are connected by sleepers 102, located

  respectively at the back and the front Both

  102 are perpendicular to the plane of symmetry 9 and are interconnected by two hoop tubes 103, which are spaced from each other and which are symmetrically located on both sides of the gearbox 98 and the plane of symmetry 9 At their upper part, the arches 103 are connected by connecting bars 104 parallel to the axis 95 near the

  plane of symmetry 9, two oblong plates have been

  parallel lines, which are placed vertically, extend in direction A of the advancement and which are

  rigidly attached to the connecting bars 104.

As shown in FIG. 5, the tubes 103, the bars 104 and the plates 105 are disposed on either side of a vertical plane 106, which comprises the axis 95 and which is perpendicular to the plane of symmetry 9A. At the rear of the rear cross member 102 and at the front of the forward harrow 102, are rigidly fixed flat supports 107 The supports 107 are provided with mounting holes 108 for coupling the cutter 94 to the low points of a lifting device. An energy source Near the two ends of the plates 105 are also provided fo 9 fixing holes for connecting the cutter to the upper point of a three-point lifting device. The spacing of the supports 107 on the bars.

  102, corresponds to the spacing of the coupling points

  Fig. 5 shows that three coupling points 108, 109 on one side of the cutter 94 as well as those of

  the other side of the cutter are arranged in a reflective

  relative to the plane of symmetry 9, so that the cutter 94 can be hitched as well by its rear as by its front to a three-point lifting device It is possible to provide machines or agricultural tools with a Another kind, similarly, of such a possibility of double coupling In the embodiment according to FIG. 5, the fixing holes 109, seen in profile, are located vertically above the corresponding fixing holes 108. but this is not mandatory and should not be considered

as a limitation.

  Behind the cutter driven around the axis, is arranged a row of cultivator teeth A, which extends over the entire width (3 meters) of the cutter and which can be moved, from the cab using at least one hydraulic cylinder,

  parallel to itself up and down.

  As shown in Figure 5 and partially

  Figure 7, we hitched, at the back of the

  source of energy, three machines at the same time

  positive lifting 53; a rotary harrow 110, a seeder 111 disposed above the harrow 110, and a roller 112 which can be driven and which is located behind the harrow 110 and partly below the seed drill 111 and which serves, among other things, as a roller

  which provides a crumbling of the earth.

  The harrow 110 has an incoming shaft 113 (FIG. 7), which is situated near the plane of symmetry 9 and which, by means of an intermediate shaft 76 provided with universal couplings, is coupled to the axis of engagement of force 15 that can be driven at a speed

  proportional to that of the drive motor 10.

  Near the middle of its length, the harrow 110 is provided

  a substantially triangular and vertical stem 115

  wedge and which, near its upper end, is

  provided with mounting holes 116 for the upper tie rod

  In the vicinity of the two lateral branches of the bracket 115, there are disposed on the main frame of the harrow supports 117 for coupling the harrow 110 to the lower arms 49 of the lifting device of the source.

  of energy With each of the supports 117 cooperate -

  still two carrying arms belonging to other machines, namely, a carrying arm 118 which belongs to the drill 111 and a carrying arm 119 which belongs to the roller 112 The two arms 118, situated on both sides of the plane of symmetry 9, s extend from the lower coupling points obliquely upwardly and rearwardly to a carrier beam 120, which supports the seed tank 121 of the seed drill 111 over its entire width (about 3 meters). 118 are rigidly connected to the other part of the drill 111 The dimensions are such that both

  arm 118 extend to above the harrow 110.

  At the front and near the plane of symmetry 9 is disposed on the seed tank 121 a support 122, with which the drill 111 can be coupled to the upper end of the bracket 115 and the tie rod 52 'The arms carriers 119, which belong to the roller 112, are arranged symmetrically with respect to the plane 9, and extend, from their coupling to the lower lifting arms 49, obliquely rearward and slightly obliquely upwards to a carrier bar 123, which constitutes a bar of

  frame for the roller 112 The arms 119 are pre-

  are rigidly connected to the frame of the roller 112.

  On one side of the plane of symmetry 9 and at a short distance therefrom is a gearbox 124 for driving the roller 112, which is secured to the carrier bar 123 The gearbox 124

  includes a gear reducer, with the help of which

  The water 112 can be driven. An inbound shaft 125 of the gear box 124 is connected by means of the spindle.

  of the intermediate axis 75, provided with universal couplings

  salts, to the outgoing axis 74 of the transmission paé engre-

  72 of the propulsion device 60, axis 74 which can be driven at a speed proportional to the

  tractor travel speed or energy source.

  The gearbox 124 has an outgoing axle which

  is connected by a drive shaft 126-, perpendicular

  to the axis of symmetry 9, to the incoming axis of a drive box 127 extending from the axis 126 obliquely downward and rearward towards the main axis 128 of the roller 112 The drive box 127 comprises a chain drive, with which the roller can be driven at a tangential speed approximately equal to or slightly greater than the forward speed of the energy source. For this, the rotational speed the axis exiting the gearbox 13 is slowed down in the drive box 19 of the tractor, in the gear reducer 124 and in the drive box 127, so that the tangential speed of the roller

  is consistent with the aforementioned speed of advancement.

  Near the plane of symmetry 9 is articulated on the frame of the roller 112, a rod 129, of adjustable length, which is located between the upper face of the harrow 110 and the underside of the seed drill 111 and which extends to the point of upper coupling of the bracket 115 and the seeder 111 with the upper tie rod 52 of the lifting device 53 The seeder 111

  is provided with a row of sowing tubes 130, which extend

  tooth, from the seed tank 121, oblique-

  downward and backward and which are in

  contact with the ground behind the roller 112.

  From the foregoing, it is clear that the fixing points of three machines with the tie rod 52 and the lower lifting arms 49 of the three-point lifting device 53 coincide. For this, the attachment points are made as indicated in FIG. In this way, the coupling of one or more machines does not depend on the coupling points of another machine to be coupled to the same lifting device and which should then have a more complicated and In FIG. 8, a support 117 of the harrow 110 is situated on one side of the plane of symmetry 9 and in fact comprises two ears both designated by the reference numeral 117. These supports 117 are framed externally by a

  fork 131 secured to the carrying arm 119 of the wheel

  The fork 131 is framed, in turn, externally by a fork 132 fixed rigidly to the end of the carrying arm 118 of the seed drill 111. This is made possible because the supports 117, the

  arm 119 and the arm 118 have angular orientations

  The supports 117 and the forks 131 and 132 are articulated by means of a pin 133 on the rear end of the lower lifting arm 49 corresponding to its upper part, the bracket 115 forms brackets, which are indicated in Figure 8 also with the reference 115 The outer faces of the supports 115 are framed by a fork 134, integral with the rod 129 of coupling the roller 112 with the tie rod 52 A outside the fork 134 , are located

  two plates 122 (FIG. 7), by which the reservoir

  Seed 121 is connected to Tug 5-2 of the

  If the seed drill 111 and the roller 112 were provided with support arms 118 and 119 respectively,

  articulated on the corresponding machine, the coupling

  represented multiple would also be possible

  since, in profile, the triangulation of

  ports ensures a stable position.

  In FIG. 9 is shown another combination of possible agricultural machines, starting with

  the same source of energy, with the provision of

  Lifting device 53, a chemical fertilizer spreader. This can therefore be arranged in place of the roller 112, in combination with the harrow and the seed drill 111, if the spreader 135 is equipped with

carrying arms 119.

  In this way, the following combinations can be realized: 1 energy source with drill; 2 energy source with roller and seed drill; 3 energy source with harrow and roller; 4 energy source source of energy with harrow and drill; with harrow, roller and seeder; 6 energy source seeder; 7 energy source fertilizer spreader; 8 energy source roller and seeder; 9 source of energy source of energy; source of energy source of energy; 11 all combii with strawberry, roll and with strawberry, harrow and with strawberry, harrow, with strawberry in front with strawberry behind the pieces of strawberry in front

  or behind the power source with other tools.

  The total length of the agricultural machine is about 6.4 times the diameter of the wheels of the power source; the total width of the machine is approximately 2.3 times the diameter of the wheels of the energy source The wheelbase of the energy source is substantially equal to the length of that of the trains

  before 33 or back 47 the longest.

  During operation, the motor 10 drives, through the gearbox 20, the gearbox and differential 13, from where the wheels 33 of the front axle are driven with a gear ratio chosen by the driver , which determines the speed of advance The PTO shafts 15 and 17, which protrude rearward respectively forward, are driven during operation directly by the motor shaft A -partir the output of the box of speeds, it also drives the front PTO axis 22 and the rear PTO shaft 21, which as already mentioned, have a rotational speed, proportional to the speed of advancement. the front of the tractor at its rear, it has PTO-axes that can be driven according to the engine speed and the speed of advance respectively The cutter 94 can be driven to the help from an inte either from the PTO shaft 17 (depending on the engine speed) or from the PTO axis 22 (depending on the speed

Progress).

  By controlling the hydraulic cylinder 38 (Figure 2), the front wheels are pivoted about the axes of the tubular supports 31, which act as rocket axes The angle on which the wheels

  can rotate, is, counted from the posi-

  2 and corresponding to straight-line advancement, from about 90 to one side and about 900 to the other side, so that a total rotation of about 1800 of the front wheels around rocket axes is possible The geometry of the direction with the steering plate 36, the steering rods 35 and the levers 34 is such that the center of rotation of the tractor, making a turn, is located, with a minimum radius, at inside the outer periphery of the tractor This has the advantage in case of maneuvers at the headland, to increase the cultivated area, thanks to the reduction

steering radius.

  By the control of the hydraulic cylinder 87, the inclination of the three-point lifting device 93 relative to the ground, can be modified by rotation about the pivot 78 This facilitates the coupling of machines or tools, because then a setting of mating points, such as upper arms, is not necessary if this movement is combined with upward or downward movement of the lifting device 93 in its entirety with the aid of the cylinder 85,

  with sliding bars 82, 83, 84, 90 and by.

  Therefore, the jacks 59 can be controlled from the driver's cabin 6. By controlling the hydraulic cylinders 59, the levers 56 are pivoted about the axis 55, so that With help of the links 57 the lower lifting arms 49 of the three-point lifting device 55 can be moved forcefully as

up than down.

  The drive of tools, fixed to the lifting device 53, is done using the intermediate axis (proportionally to the speed of advance) or,

  alternatively, using the intermediate axis 76 (proportional

  the motor speed), as described above. Thanks to a belt or chain transmission (not shown), the seed drill 111 can be driven.

  from the incoming axis 125 of the roller 112 or

  The main axis 128 of the roller 112 may be driven at a speed which

  corresponds to the speed with which the trac-

  at a slightly higher speed. The main axis

  cipal 128, made in the form of a tube, is provided with a row of cutting crowns with teeth 136, row which extends over the entire width (about 3 meters) of the machine The active width of the drill 111 and that of the harrow 110 also agree with this dimension By the drive of the teeth 136, it does not only get a tillage, which completes that of the previous machines for working the ground, but also a force, which propels the entire machine and that is added to the strength of

  propulsion developed by the wheels, and which is borrowed

  to the power of the PTO shaft, so that the traction force of the drive wheels 33 and the pressure exerted on the ground may be lower than they would be if there were no driven roller In poor soil characteristics, the roller 112 can provide an important contribution to propulsion, because the risk of

  skating is much lower in this training

  For this reason the radial dimension of the teeth can

  to be chosen relatively large During the

  The tube, which carries the projections, can rest on the floor and be cleaned by scrapers 137 fixed to a frame bar 138, which extends over the entire width of the roller behind the latter, the scrapers extending, from the bar, obliquely forwards and downwards, between the teeth, to come into contact with the lateral surface of the tube The cutting crowns project out of the tube at a height approximately equal to the spacing of the tube. two

neighboring crowns.

  The arrangement is such that all the machines hitched to the rear lifting device of the energy source, with the lifting device 53 itself, the rear wheels 47, the carrying members and the bar 44, can oscillate like a all relative to the other part of the energy source and the machines coupled to the front lifting device 93, around the axis of the tube 2, horizontal and parallel to the axes A of advancement It is also possible to fix several machines to the front hoist 93, in the same manner as described for the rear hoist 53 The tractor shown in Figs. 1 to 3 may have a relatively light weight due to the use of wheels with rim. aluminum or other light metal with a diameter of not more than 1.3 meters, since the weight

  of a wheel varies as the square of its diameter.

  The chassis of the machine is very light, since it consists of the tube 2 with supports 12 for the gearbox 13 and a lightweight superstructure 5 for the cabin 6 The cabin 6 comprises walls and a roof, which are made of In this way, we can limit the weight of the tractor, or energy source,

  at about 3500 kg The power of the drive motor

  10, can then be reduced to about 100 k W. The tires of the wheels 33 and 47 are low pressure tires, with low sculptures of a height of about 3 centimeters By adopting low pressure tires, the base of each tire on the ground is significantly wider than the nominal width of the tire, and a surface of

bigger contact.

  Since the tractor, or energy source, has eight wheels, and the wheel tracks do not overlap or little, we obtain a surface of the total contact on the important ground, on which

  divides the weight of the tractor and that weight being

  even reduced, the pressure on the ground is very low.

  In this way, the soil structure under the tractor

  remain intact and there can be no adverse consequences

  for the subsequent growth of plants.

  In the alternative arrangement of the rear wheels 47 (according to FIG. 4), instead of the arrangement according to FIG. 2, the tractor can be used for the

culture in rows.

  The distribution of the weight of the tractor is such that most of its weight rests on the front wheels 33, engines The weight of the engine and the fuel reserve is arranged in the middle between the two sets of wheels 33 and 47, while than the weight of the gearbox and the differential

25335 Z 2

  as well as most of the weight of the cab rest on the front wheels to ensure strength

  maximum traction of the wheels.

  lifting machine before 93 and the machines that are hitched are, for the same purpose, arranged so close

as possible front wheels 33.

  The rear wheel train 47, with the provision

  rear lifting device 53 and the machine or machines which are coupled to it, can oscillate freely with respect to the other part, so that the drive wheels 33,

  stay constantly in contact with the ground.

  The propulsion device 60, which is

  driven with equal or slight tangential velocity

  significantly faster than the speed of

  to use some of the power of the pin

  force of the tractor for the propulsion of it

  possibly in combination with the propulsion force

  the roller 112 and the cutter 94, so that the propulsive force is not limited by the

  drive wheel slip The propulsion device

  60 may, in certain circumstances, provide half or more of the propulsive force required; because of its nature and its central disposition, the device also has the advantage of not requiring a differential and being able to be placed in active position or not, at will, using the lifting means 69, 70 The device propulsion 60 can be arranged analogously between the front wheels

33.

  The lightness of the walls of the cabin, achieved

  such as plastic, contributes to the reduction

  weight of the tractor The front carrier 3

  is equipped at both ends with vertical

  139, which, above the cabin roof, are connected by a transverse bar 140 The cabin is located inside the safety frame formed by

the amounts 139 and the bar 140.

  FIGS. 10 and 11 show a very light variant of the safety frame 141 for the driver, a frame consisting of posts 142

  which extend from both ends of the

  rear carrier 3, first vertically upward, then tilt forward from the level of the frame portion 5 (reference 143) to then be bent horizontally to about the overhang of the Turning axes of the wheels to the rim The portions 143 of the uprights are rigidly connected by a transverse bar 145, while the safety frame is delimited near its front end by

  a transverse bar 146, which connects the sensing parts

  The portions of bars 143 and 144 converge weakly forwardly In this embodiment, the driver's seat is not

not surrounded by walls.

  The described tractor is a source of energy for driving an agricultural machine, which can

  be the combination of a variety of tools, inter-

  changeable of different nature The tractor is a source of energy, which is especially suitable for working the land The combination of such

  source of energy and tools is particularly

  for spring tillage and

  Plowing of plowed land for winter (thanks to the low pressure on the ground), as well as for stubble cultivation and for working the land

fall and seeding.

  The low weight of the tractor leads to

  significant fuel economy, particularly when

  the tractor moves on plowed soil.

  The soil is less compressed, the yield of plants is increased The large number of wheels of the tractor, which, seen from the front, form a virtually uninterrupted row, causes an equalization of the compression of the soft earth and the removal of ruts. These various arrangements result in a light weight tractor and therefore low cost, using less fuel while

  allowing an increase in the yield of plants.

  The tractor according to the invention, which constitutes a revo-

  lution against the current trend of increasing the own weight of tractors, combines the work of the land and propulsion, maintains the soil structure

and saves energy.

Claims (18)

REVENDI CATIONS   1 Agricultural tractor comprising a motor, at least one PTO shaft and at least three wheels, characterized in that at one of its ends the tractor has on each side at least one drive wheel (33), while at the other end at   least one driven wheel (60) is arranged in the middle of the tractor.   Tractor according to claim 1, characterized   it is equipped with two steered wheels   (33) pivotable about an axis directed upwards.   Tractor according to claim 1 or 2, characterized in that the driving wheel (60) located near the middle of the tractor is a metal roller trimmed of teeth (68).   Tractor according to any one of the   1 to 3, characterized in that the side wheels   The tractors (33) of the tractor are provided with tires.   Tractor according to Claim 3 or 4, characterized in that wheels (47) are arranged beside the metal roller (60) and that the roller (60) is adjustable in height by means of relative to said wheels (47).   Tractor according to any one of the   dications 1 to 5, characterized in that it is provided with at least one PTO (17, 73, 22) at each of its ends.   7 Tractor according to any one of the   1 to 6, characterized in that it is equipped with at least eight wheels (33, 47) provided with low pressure tires.   S tractor according to any one of the   1 to 7, characterized in that the wheels   (33, 47, 60) are arranged in two transverse rows. dirty in the sense of advancement.   9 Tractor according to any one of the   1 to 8, characterized in that the tire wheels   (33, 47) have a diameter of about 1.3 meters.   Tractor according to any one of the   1 to 9, characterized in that it is provided with a front lifting device (93) and a rear lifting (53).   Tractor according to any one of the   1 to 10, characterized in that its engine (10)   is a light engine with air cooling.   Tractor according to any one of the   3 to 11, characterized in that the teeth (68) of the roll (60) are made in pairs of one piece of metal.   Tractor according to any one of the   1 to 12, characterized in that the wheel (60) is driven by a tractor PTO shaft (73) at a proportional rotational speed.   to the progress of the tractor.   Tractor according to any one of the   1 to 13, characterized in that the wheel (60)   disposed between the lower arms (49) of the rear lift (53).   Tractor according to any one of the   dications 1 to 14, characterized in that it comprises at its front and rear ends, two PTO axes (17, 22, 15, 21), one of which (21, 22) is driven at a rotational speed proportional to that of the tractor's progress, while the other   (15, 17) is driven at a rotational speed proportional to the engine speed.   Tractor according to claim 15, characterized   characterized in that the two front PTO shafts (17, 22) are located under the gearbox (13) coupled to the drive motor and substantially   in the middle between the front wheels (33).   Tractor according to any one of the   1 to 16, characterized in that the power of its engine is 100 k W, while its total weight is 3500 kg.   Tractor according to any one of the   10 to 17, characterized in that the front lifting device (93) comprises a plurality of rollers (81) by which the coupling points (91, 92) can be adjusted in height.   Tractor according to claim 18, characterized   characterized in that the U-shaped rollers (82) extend   tooth substantially to the coupling points (91).   Tractor according to claim 18 or 19, characterized in that the coupling points (91, 92)   are equipped with automatic hooking means.   Tractor according to any one of the   10 to 20, characterized in that its   rear lift (53) has a top rod (52) hydraulic.   Tractor according to any one of the   10 to 22, characterized in that at its disposal   rear lift (53) is coupled to a driven roller (112) which exerts a propulsive force on The tractor.   Tractor according to claim 22, characterized   characterized in that the roller (112) is provided with scrapers (137)