BE622102A - - Google Patents

Description

  

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  "Hydraulic vehicle transmission".



   The invention relates to a hydraulic transmission intended for a vehicle, for example a tractor *
The general aim of the invention is to achieve a new improved transmission of this type *
A more particular object of the invention is also to provide a new improved hydraulic transmission comprising a variable displacement pump, a variable displacement motor, a device with manual control, for varying the displacement of the pump and that of the motor for the purpose of

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 hurry ...

   of the tranamioaion, and a predominant command,
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 which responds to the pressure prevailing in the connection circuit of
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 the pump and the motor, so as to take it which, the clJJ.:.4umde ttaLnuelle to adjust the displacement of the pump and that of the 80- all, in order to modulate the pressure in the system * It'invttntion 4 # proposes * usai to realize a new obmzu4de preponderant *, which responds to the increase in -eoeaion # appearing in the high pressure duct * of the 409 UnlCation of the pump and the actor as a result of an increase in the load on the tractaiesioa during a functionnnt. rand. titeaae;

   of the headrest to first increase the volumetric displacement of the motor in order to increase the torque, and i will reduce, thereafter the volumetric displacement of the pump, and the au "..ntat1Q of the load is not not overcome * $ in order to make cea- Ott the action of the trn'.81on without discharging fluid on a relief valve and without suffering loss of pu1.sc. corroopon- 4a4t ...



  The new and improved preponderant pressure, which responds to the increase in pressure occurring in the high pressure reduction between the pump and the motor as a result of the rapid tMttveatent of the manual control increasing the speeds $$ of the trtnsmidelon increases the volutetrical displacement of the
 EMI2.4
 pump $ then reduces the volumetric displacement of the motor to a
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 gommandd degree, ut so as to maintain constant the pressure in 1.

   0,> = Qité at high pressure connecting the pump and> th motor * The invention also relates to a new communication of preponderant improvement, which is intended for a hydraulic transmission and which responds to an increase in pressure, depaum
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 are a predetermined value, and produced in the low pressure line connecting the pump to the motor by a rapid movement
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 manual control reducing the speed of the trangminalouj in such a way as to first increase the displacement Tolétr1qu "u Motor, then to reduce the displacement .olua'triqu8 of the pump to a controlled degree, so that the pr8aK1un prevails in lu conduct

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 at low pressure does not exceed the predetermined value.

   The new improved hydraulic transmission,
 EMI3.2
 according to the invention, comprises a metric variable displacement pump, a displacement motor vQlu # étriqu .. & r1. ble, a common cam device comprising cleared camos * to independently control the volumetric displacement of 1 pump and the volumetric displacement of the motor, and finally a so-called "positive z Manual control to control the auxiliary dispouitit In this transmission, the device of oo ** <The camshaft comprises separate distribution parts, which combine separate piston and cylinder devices, associated respectively with devices for varying the volume of the pump. and the engine.



  , In the new portcot19é transmission. like
 EMI3.3
 previously mentioned, a cam comprises separate portions, which are respectively mechanically connected to the
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 variation of yolumetric displacements of the, pump <and the moteuv! it #and controlled by a piston and cylinder device, itself controlled by a distribution device <. cotffi4ade
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 manual.
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  The invention created a novel cooling circuit associated with a ydr * ulc lamé circuit connecting a pump to an engine in a transmission where this cooling circuit supplies coolant. , exoee in relation to the compensation needs, in a way
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 to change the heated fluid outside the circuit *
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 On the other hand, the invention achieves a new trana <t
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 advanced differential hydraulic mission, which includes
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 a pump z swash plate, a coaxial motor lt flat 0'011 ", lant, a differential ooaxial gear el 1 ent, renQ.II, e8 and a difap ifcif to vary the volumetric d4ylaccesutuueu of 1 pump and the motor with a view to change the speed widely
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 of the tree us the aor'vie of the transinipui-on.

   

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   Other aims and advantages of the invention will easily become apparent on reading the detailed description which follows.
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  Watt. Soteter description ru of 8sin annexed in which Figure 1 shows schematically the mucanic and hydraulic characteristics of a transmission in accordance with the principles of the present invention.



   Figure 2 is a longitudinal section, with a par-
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 tie in elevation, of the transmission shown schematically in Figure 1.



   Figure 3 is a cross section, along the line - of figure 2, of the distribution plate mounted between the pump and the motor of the transmission *
Figure 4 is a section taken along line 4-4 of the
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 Figure 2 and xtontrales Il distribution channels fixed on the distribution plate shown in Figure 3.



   FIG. 5 is a partial and enlarged view in section.
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 vation, which is analogous to fistito 2 and which represents the cock-jsande of the oscillating plates of the pump and the motor, represented in the preceding figures.
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  FIG. 6 is a section taken on line 66 of FIG. 5, ctainacti .. being shown in elevation,, FIG. 7 is a partial view of a modified oriou1t.



  Figure 6 shows schematically a variation of the transmission.



   Figure 9 shows another variant of the tensioning *
Figure 10 is a longitudinal section, partial *
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 In elevation, of a differential transmission, we used a differential gear train aligned with the pump and the motor to obtain a wider range of speed *
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 The fibula 11 is a cross section of a distribution plate ue the tran8i8siun shown in Figure 10.

   

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 EMI5.1
 -ida tl6ure 12 is a partial tranioveroal cut twelve distribution block, fixed on the distribution plate shown
 EMI5.2
 felt on the 11 $ fibuit The attached drawing shows the ru'm- lisation modes chosen at titled 4'.x.mpl ... which will be described pim far in detail;

   the invention can oependaat tt.re carried out. or. many different format, and of course the r.pr8.nt '. here, to illustrate the principles of the invention, not limiting the same in any way * If we now consider the * embodiment * shown in Figures 1 to r it will be described with reference to the figures on the edge. k â 6 representing the structure, puio to your schematic view of the circuits of figure 1. As seen on
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 1 Figure 2, the transmission comprises a housing 10, in which are shown a pump 11 and a motor 12.

   The pump 11 comprises a rotary block of displacement 15, which is fluffed by grooves.
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 res on a drive shaft 16 so as to rotate therewith; this block 15 comprises several axial and cylindrical bores * 17, in which are housed pistons 18 which can be driven
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 of a reciprocating movement. Block 15 is molded by a spring 19 against a perforated plate 209 which is pinned to a central distribution plate 21 fixedly mounted in the housing.

   The perforated plate. 20 and the distribution plate 21 have complementary curved inlet and
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 output * 23, 4 (fibure 3), to establish successful communications * with the orifices 25 of the cylinders 179 during the rotation of the block 15, in order to effect the admission and the exhaust of the fluid in the cylinders 17 .

   the outer ends * of the pistons 18 cooperate with a swash plate 28, which can pivot in different directions
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 opposites from a neutral central position of minimum volumetric displacement (figure 11) up to positions of maximum volumetric displacement, located respectively on both sides.

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 on the other hand from the central position, in order to vary the 4'plMc ... nt voluuitr1qut of the pump and to carry out * milking-01 a reversible current.

   In other words, either of the curved crificee * 23 # 24 can function as an inlet or an outlet port depending on the position of the post 08011- lant 28 The shaft 16 of the pump is mounted so to be rotated with an input shaft 30; it carries a wheel of which 3 z required 4V'O a toothed wheel 2 # so as to drive a metering pump 33, the around 12 have similar to the stern 11, MiM it is significantly larger than the latter; it includes a block of cy- lia4tot 35, which this clearet * by oenneluree eur an output shaft 36 of fut} on 4 turn with oelui-oi, and which comprises displacement 7, in which are lobed new p18tonqs. * Have alternative. The cylinder block 35 is pushed by a drop 40 against a perforated plate 41 applied against the central distribution plate 21.

   The perforated plate 41 has curved orifices cooperating over the orifices d3g 24 $ so that the pump and the motor are connected in a circuit IIdrau- liqu * formed with tight coupling. The orifices 43 of the ooopê-
 EMI6.2
 all with the holes in the plate 41. The outer ends
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 pistons 38 cut with a swash plate 45, which can move between a volumetric displacement position as well and a maximum volumetric displacement position. represent our figures 1 and 2.



  The input shaft 30 is driven by an author, by an internal combustion engine, comat those ordinarily used on tractors and vehicles naloe8. The shaft 36 of the engine 12 * and connected to an output shaft 47, itself connected to the drive wheels of the tractor.



  104 oscillating plates 28 and 45 are controlled by similar cylinders 50, 519 shown in detail in Figures 5 and 6. The cylinder 50 comprises a cylinder 53

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 articulated at 54 on the swash plate 28, dw so as to pivot the latter when the cylinder 53 slides on a piston 55 provided with a rod 56 articulated on a fixed shaft 57.



     @ During operation, the pressurized control fluid is constantly supplied to the cylinder 50 by a cage pump
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 thought 33, by means of channels comprising a seat. "ge ajcial 59, formed in the shaft 57 ert communicating with. 4 .. radial fices rice 60, opening into an annular groove 60, which itself communicates with a channel 62 of the piston 56. This channel 62
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 opens into a gag chamber including an orifice 64 eomsunue with a chamber 66, formed on one side of the piston 55 of the Q7d ,.

   55 1, chamber 63 also communicates via U4 throttled orifice .3 with a chamber 69, located on the opposite side of the piston of the cylinder 53à The chamber 69 'couun1q'Jt with a cua1 71 ra ending with a throttled orifice distribution 7a ..



  It is understood that if the orifice '8 * formats the pressure retaining in the chamber 69 "' t, Ì, l1 .. then with the pressure prevailing in the chamber 66; on the other hand, because a! More large area of the piston is exposed before 044mFe 69, If I cylinder 53 is driven <tt to the right (figure 6), and rotates the swash plate 28 in the opposite direction of n.l1 back clockwise (figure 2). If the orifice 7 << is on the contrary open, the pressure prevailing in the chamber 69, which pressure is reduced compared to the glue of their chamber 66 ,, allows this second pressure to drive the cylinder bzz to the left (lock 6), and thus rotate the swash plate 28 in
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 clockwise.

   In this way, the collecting tray 28 can be swiveled in either direction from its neutral central position shown in Fig. 1. During operation, a static position is preferably obtained.
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 that by partially opening or partially forming, 'arif3, this 72, so that the force produced by the annealed pressure, prevailing in the chamber b9 and abibniint against a surface rlt.l, 1.' "j

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 The greater force of the piston is equal to the force produced by the relatively larger preuaion in chamber 66 and acting against a relatively smaller area of the piston.



   We will now describe the device controlling the opening and closing of the dispensing orifice 72.



   The jack 51, controlling the swash plate 45 of the
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 motor, is similar to the cylinder "1; it comprises a cylinder z ';, articulated on the swash plate 45 at 76 and able to slide
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 on a piston 77, provided with a rod 78 articulated on the shaft 57, the fluid arrives in the jack 51 passing through the channel 59,
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 the radial orifice 80, the annular orifice 81, the channel 82 and a chamber fez.

   The chamber 83 communicates by a channel 85 with a chamber 86 located on one side of the piston 77; it communicates on the other hand, by a constricted channel 88 with a chamber 90, located * on the other side of the piston 77 'This chamber communicates with a channel
 EMI8.5
 91, ending with a dispensing orifice 92, which is controlled so as to move the swash plate 45 of the motor between a minimum volumetric displacement position and the maximum volumetric displacement position shown in Figures 1 and 2.



   The flow of the fluid, from the distribution orifices 72, 92 towards the interior of the housing 1C, is controlled by a cam or distribution plate 100 articulated around the axis
 EMI8.6
 of the shaft 57 'As can be seen from VO.b in FIG. 5, the plate 100 has a slot 102, the inner peripheral edge of which
 EMI8.7
 (in the radial direction) controls the orifice 7, so as to allow * r * to vary the angle of Anclinaiaon of the swash plate of the pump; .the ivo plate also comprises a cast iron 103, the inner peripheral edge of which (in the radial direction) controls the orifice 92, so as to vary the angle of lncoinùao4 of the grinding plate of the motor.



   The slot 102 has an end portion 104 concentri

 <Desc / Clms Page number 9>

 
 EMI9.1
 that at the pivot axis # a whole part 105, exetntrés with respect to the pivot axis $ and a concentric axtraaa part 106. this axw * Laying the operation * when the mission trait have at the ï'opoa the pl & qu-x 100 is arranged noratalaaant, as we see it on the figure 59 c, .. t. to say 4.voo], 'orifice 72 located in the middle of the inner peripheral edge of the port; ion do make 105. As a result, the swash plate 28 of the pump was found in its neutral central position of displacement Tolu- .'tr1e, u. aininu.

   He outlets ± have * Aduo * IIi the pltic loc pivot in the Naos of the needles of aontro around the axis of the arbra & 7t the hole 72 is unopened as a result of the font of the slot portion 105; as a result, there is a greater pressure in chamber 66 xt than in chamber 69 than in cylinder 5? moves to the left (Figure 6) and the swash plate 28 rotates clockwise to the position shown in Figure 2.

   Thus, the tranazia- sion works in a direction that we will call1 -the direct sound-
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 On the contrary, if the plate. 100 rotates in the direction
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 counterclockwise # the hole 72 ends $ owing to the shape of the tent portion 105j it in rfsu1. there is such an increase in pressure in the chamber 69, that the cylinder z moves to the right (figure 6) and the plate
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 the collecting water 28 swivels in the opposite direction to that of the
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 openings of a watch from its neutral position; the transmitted-
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 sion then works in the reverse sana *
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 When hole 72 finds you. one or the other end
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 mita of the cast iron portion 105. if the plate 100 returns to
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 the position shown @ in Figure 5, the swash plate 28 obviously returns to its neutral position.



  At opposite ends of the portion 'of any 1059
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 the slow portions 104 and 106 are substantially concentric
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 to the axis of the shaft 571 therefore the movement of these two

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 portion # of palreport tent 'or1t10. 7.2 does not affect 10 re-adjustment of the wobbling plate M. como we will see, the portions
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 slot 104 and 106 are used to retain the swash plate
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 28 in 404 maximum displacement position, while a continuous movement of the plate 100 is used to vary It
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 tilt angle of the swash plate 45 of the Motor.
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  The slot 103 co = andant the gold111c. 9 Mumar coalesces a 108% * central * party that is more or less oonc. with 1 * axis of shaft 7. and of * part oppo <4 <i <t wxtrCaKK 109 and 1-0, which M are concentric with the axis of Shaft 57 # and which serve to vary angle to the swash plate 4. The length of the slot portion 108 corresponds, with respect to the axis 57, to the length of the slot portion 105, while the length (s) of slot 109, 110, correspond respectively to the length * of * slot outputs lu. 59 106. thus, during operation, when the trnaW188iQn is at rest, the orifice 92 and finds in the middle of the inner periphery of a la slit portion 10b <.

   When plate 100 moves into either ditoction from its position shown * in Fig. *,. the swash plate 45 remains in its maximum displacement position shown on the lines 1 and 2, as long as the orifice 92 meets the slot portion 108. It is
 EMI10.6
 obvious that we thus retain the Oscillating plate 45 of a
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 maximum volumetric displacement position # while the oatillant plate 28 of the puma * pump from a minimum volumetric displacement position to its 8 "volume displacement position! aU ..
 EMI10.8
 



  When orifice 92 meets the inner periphery
 EMI10.9
 of one of the two expansion portions 109 and 110, it hase discovered, and this results in the chlorine 90, a excess pressure leakage to allow the cylinder 75 not to move to the right (figure 6) and to the swash plate 45 of 4 * move daneie is the reverse of that of the aib-uilleu of a watch, towards a position of

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 minimum volumetric displacement. At this time, the orifice 74 meets the concentric slot portion 104 or 106, so that the pump swash plate remains in a maximum volumetric displacement poei "" tion, while the plate '
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 oscillating motor moves to a position of moving
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 sort volume as minimum.



  The operation described makes tm: t3r the
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 transmission speed, by passing the chainring first
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 oscillating pump from one position of displacement volutr * "
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 minimum to a maximum volumetric displacement position, and, 'then passing the swash plate of the motor by one
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 maximum volumetric displacement position L a minimum volumetric displacement joaition.

   Conversely, ç, us.ud 3 a speed of the transmission is reduced, the plate oevi, â.azst 4-u motor go moves from a displacement position: volt4i4triqqe mi "1 niaux to a volumetric displacement position and
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 the pump swash plate then moves * one position
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 minimum vehicle displacement at a position of dp..aprx. #
 EMI11.10
 minimum volumetric.
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  The pivoting of the plate 100 have couman4 * the aoy'ea of a manual control; This order includes a * handle 115 (figures 1 and 2) $ which is articulated at 116 on the housing 10 and at 117 on a connecting rod 116 $ this connecting rod is a piston b ,, 1 connected to a piston 119 contained in a cylinder movable l <! 0t * normally held in a central position on the piston 119
 EMI11.12
 by central springs 121. The cylinder 120 is lit
 EMI11.13
 connected to a connecting rod 122, which can rotate the plate 100.



  During operation, the resaorta 11 are "uffi-!"
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 are powerful so that the manual drive of the handle 115 xi the movement resulting from the pi ,, ion 119 causes the displacement of the cylinder 120 and in eleven times of the 1U plate, without that there, 4g relative movement occurs between the piston 119 and the; Ju: 1r 1 <U. Thus, we can increase or decrease the speed of 44 tuts,

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   mission by moving the handle 115.

   However, the piston and cylinder device 119.120 constitutes a predominant control.
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 rante, which responds to the pr.ssoc of the closed circuit established between the pump and the motor, to take precedence over manual control, in the event that the pressure rise in the circuit is sufficient, as is will explain it later in a more
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 a4-cut.



  Guide axes. z 14 respectively fixed wall the cylinders 53, 79, are fitted in slots 125 126 to the plate) 100; the shape of these slots corresponds respectively-
 EMI12.3
 mounted to that of the distribution slots 102 and 103.



  To make the circuit shown in figure 1,
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 j and 4, the curved orifices "j, 24 respectively communicate with channels 130, 131 * each of which communicates with a high pressure relief valve 132. As can be clearly seen in Figure 3t each relief valve 132, co #prenn sleeve z 133 # in which this lobed a piston t34 polst by a spring z5 to a closed position, from which the pedestrian will stop the orifices 136. The piston bzz4 can move, overcoming the resistance of the spring l5 # to unload excessively high pressure from any of ports 23, 24,
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 dana Iluutru of these orifices.



   As can be seen, the circuit is a substantially constant pressure system, in which the pressure is regulated by controlling the swash plates 28, 45 of the pump and of the motor by means of the overriding control device 119, 120, with piston. and cylinder. Thus, the high pressure relief valves
 EMI12.6
 "resi:>. 40on 132 only release sudden surges in high pressure, before lu Cauuaande 11, 120 effectively reduces the pressure.



  The z compensation pump sucks the fluid from inside the collector 10 and supplies the low pressure side of the circuit with a quantity of fluid in excess of the requirements.

 <Desc / Clms Page number 13>

 
 EMI13.1
 of the coap.nIJa.t1on. want the goal of ensuring ref.oiàiaeesent.



  Due to the erroneous oouplae * made between the pump and the motor, due to the fact that the length of the conduits connecting the pump and the .0- motor in circuit will be * el ... n1 em.nt. the thickness of the distribution plate 21 and the perforated plates kQ and 41 # the fluid does not pass through dfc consulta lanyard or pipes
 EMI13.2
 which would constitute * effective cooling loops.
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  The fluid therefore became excessively hot, Louligentat4on in t1Ui (1 ', carried out by the excess cumpengatitent pump by breaking as needed; the'. Cumpensation, is used to discharge the heated fluid from the oi1 pressure badge. 'o.u1' ;.



  The compensation pump 33 delivers the fluid, through a conduit 140 (flowers 1 and), into foratus bypass channels through a bore 141 (Figures 1 and 3) of the distribution plate 2 '1. This bore 141 communicates with bypass channels 142 143 terminating respectively at the curved orifices A3 and 24 * Communication between the duct 140 and the bypass channels 142, 14J is normally prevented by check and compensation valves 144 , solicited by reinforcements and pushed against sive8 to the etritâ8 oppoaeea ac the aléau6o 141.

   Each valve 144 has one or more orifices 143 communicating respectively with the channels 14J, 14j, such that the pressure r6bwint in the high pressure orifice 23 or i4 keeps the associated valve effectively forced, while the fluid delivered through- the compensation pump moves the other valve to the open position and thus admits
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 the compensation fluid and in that of
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 two orifices 2j # 24, which is subjected to a low prension.
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 The compensation fluid, in excess of the compensation needs, forces the heated fluid from
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 from the low pressure port 23 or 24, through the associated channel 130 or 131, to one of the channels 148, 149 (Figures 1 and 4) communicating respectively with the channels 130, 131.

   Lea a ^ -

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 EMI14.1
 uaut 14ut 149 oQun1qu.nt with a bore 50, in which can * gulleugr a neutral distribution orbune 152 * This Qral10 40 distribution 152 has a narrower central part 153 eo = r1. ontr * parts will widen or portlon Ue plutun 1;? 4, H? <; Itu at the opposite ends of said ortenue During operation, when the transmission is moved, the distribution member 152 is disposed, as seen in FIG. 1, in such a way as to connect the channels 14a together.



  149 # and to have the Prussian high side and the Busa side communicate accordingly. pressure from the trnüm181unt in order to 4't be & ur that this road inoperative. Qutind la trun8 # iusun must close mime in motion, the organ of distribution 1 is moved from the
 EMI14.2
 axial direction, to the left for example by r'bardant Figure 1 so as to place the portion of pedestrian 1> 5 between the * eqamuniquunt orifices with the channels 14Û, 14 and Block by âr4uzt lu co = unieuttun between these channels. The low pressure side and the high pressure side of the circuit are a.lOJ: lso1é't * so * that the transmission can operate. The dismantling of the dispensing money 1,2 to its last mentioned position can be facilitated by means of a spring 158 (Fig. 4).

   Ie movement of the orL..n8 1 to the position shown in Figure 1 can be .f .1cJ.litt by connecting it with a * ttunière not shown here the aacouaible handle 1. of com-. , \ 1briè annual, '. ". Nt. Control the depletion of the ponpu and the displacement of the motor.



  The alga6e 1 of 1trG8n. neutral distribution 152 communicates with its channels 160, 161, which are respectively aligned with channels 11% 149 and which open out through a bore 164 Containing a shuttle valve 165. This shuttle valve 165 is jMrMtCMent centered by springs, as seen in Figures 1 and 4, but its opposite ends * are subject to the prJhion prevailing in the channels 160, 161, through the intermediary of

 <Desc / Clms Page number 15>

 
 EMI15.1
 diversion channels 16 ?, 168, such aorta that the .fluid from the duct at high pressure can pass and level the CI * - pet 165 At a position, in which a central portion 4.n-.



  CLO 169 of this valve connects channel 160 or channel 161 (the one which is pressure nozzle) to a discharge channel. l? 2; this channel ends in a duchurge valve 173 which this n.ora & l has been brought to a closed position by a spring 17i t but which can be moved to an open position against the pressure at the low pressure duct, so as to drain the fluid çb # utt4
 EMI15.2
 outside the closed circuit.
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  The heated fluid, flowing through 'The discharge elueet 1739 passes into the bypass ducts 17 # X ** a cooling loops 196 # mute in the tetqg o ulvr !!. A &' - '
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 tion 177, so that the fluid that has become cold is on
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 the pump and motor m-oaniames. The fluid is <tiei ruptured inside the housing 10 to be taken up peg 4% in;: in
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 compensation.
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  The shuttle valve 165 is preferably centered p '\ 04 springs, so as to achieve its return to the neutral 40pçeele position, and for which the channels 160, 161 cocuniqueat pyso the channel 172, while 3 has transmission pause Às la. mi4rub # j dir 'recto in reverse order, or on the contrary 4 * la. aureto reverses to direct walking. During and temples, since the $ 4t O # Zmgx 160, 161 are appreciably closed, as one the VQ: 1; f \ a "1..f1.pt: 4, it was desirable to use a valve of: Uo); uXO,:; o lt) O.

    tso cié to the channel as co # penston 140, to leak 1 # prouoloà of the compensation fluid, until the moment when the olapetTNvette is displaced by the tJ, ul'n1atJ.on of the proof fc u * 'the 8t4 bmvto
 EMI15.8
 circuit pressure *
 EMI15.9
 To .coalize the function a. 'yôrinp 0 and ± 1, cOJl1Ulunu., nt L'C! 3!, ectJ.vt: m, .mt 11.10 an ,, lt-6 of inclination of the oscillating plate 28 dc read O $ ut of the swash plate 45 of the 5vtUrt the fiuid of Cvm. \: 1nI suuu pre. ion is. drifted by the due

 <Desc / Clms Page number 16>

 
 EMI16.1
 Compensation 33 in the axial channel 59 Cie l 'trb and 57 (figures * 1 and 6) by any suitable duct, such as that shown schematically on 179 in figure 1.

   Cauuaer can be seen in figure 1, the channel 179 leaves from an orifice of one of the two separate distributors .E1, bib2 of the torque multiplication and of Hurpreaaion, which we will describe a pure later, main it is of course that channel 1-9 can extend discerning from pump 1 not cut-n13at.l.vn up to channel 9, where desired.



  As we can see uur lu .fz.4ura, lu c.insl could have been used, ai we read d. sire. to play the xla of cunal 179 ae figure l.



  Distributors 11, 162, of multiplicatior. of torque and surpleasion, rvy) urdx3Xit u the preumon and aont controlled by the autavntation of lm pvuj Jrin in lus ports 3, 4; these dis- tnbuteure çonunnndunt a glow turn the flow of the fluid soue -presa .., nu from the compensation circuit, uacu 'lu command "l'Jl / oZl'.1r"' nto 119 <0, which can pt ' uudre has his account 1 func- tion of lu trrUl: il3aiCln by denying inoperative the command
 EMI16.2
 manual 115.
 EMI16.3
 nornae can be seen in FIGS. 1 ut, each biblo control distributor 18 comprises an 8ane 1s5 which anneals a distribution member lb6 pushed by a spring lb7 towards a
 EMI16.4
 normal position, in which this orune abuts against an axis
 EMI16.5
 stop Ib9 Channels 191 communicate with the com- ponaution channels 14U, 141 and ruopeutivemnct with ltt5 bores.

   Dea lys channels communicate, has a sxtâwx, tv, av: a 1t: '8 channels 14. 143, #t, the other end, reappear with the bores xi5, at places separated from the channels 191 in the axial direction *, Don dantiux 194) respectively start from the bores Ib5, terminate relJßect1vuont at the opposite ends of the cylinder lidO of preponderant commiinde.
 EMI16.6
 



  During operation, the distribution organs
 EMI16.7
 bution 166 are normiilfment d1soaÓaJco-me one sees it at the fieiures 1 and.: If consequently, the channels 14- of the cylinder 120

 <Desc / Clms Page number 17>

 
 EMI17.1
 predominant control communicate respectively avoo the annular eorgau 196 d-s distribution members lb6j ut consequently with discharge channels 197 (not visible in FIG. 3, w;

   ainnit las I..tttd # i opposite cylinder 120 are subjected to the pressure d, 6vaouawi4> neet it remains centered on the piston 119 6rect to the springs 121 * It should be remembered that read in one of 01'11 '1080 2, e4 # maintains the asegoated check valve' 144 in its closed position represent the high-proomion fluid is therefore directed through 10 Associated Channel 192 to act against an enlarged purtion of pAon 2vO from the dispensing member associated 1669 while the ccrrtitspuaaunte piston portion of the other distributor valve 16 is subjected to a relatively lower compensating pressure by the open valve of the retainer 144, A1nai.

   '& i the pressure' increases 8u1't1wac- mttnt in the high pressure pipe 121 the distributor member! corresponding la6 can be moved, Despite the prousion of the spring le37 to a position, in which it blocks the cumi4u-i nioation between the channel 194 of the cylinder 120 and the evacuation channel 17 and makes cummunique lt . llulae control channel 191 with lu channel 194t in order to admit the fluid under j) reBs.n in an extrm.i.tÓ of the preponderant control cylinder 120 and to place the latter relative to the piston lllj.



  The distributors? control 181, 182 and the preponderant control di4po aitif 119, 1 <: 0 are calculated to operate under the action of an excessive Ut: .. lXl'l1tatJ.on. near  ; sion in the duct at high pressure under two different conditions; the pressing condition is the case where the transmission tonc-1 lioness has high speed and undergoes an increase in load, causing an increase in pressure;

   the second aondition have, ##
 EMI17.2
 the case where the manual control 115 is moved very quickly from a neutral position to a brande position

 <Desc / Clms Page number 18>

 
 EMI18.1
 y1 t "I '. by rapidly increasing a1n..1 the displacement of the computer at a time when the motor is resisting the & mntatiua. r.:J.p1 ... ode of speed PU following the inertia of the vehicle auboci4 at the 1I.'auuwi, uiQt1.
 EMI18.2
 



  The preponderant order is madly calculated from
 EMI18.3
 fa; n to function goat ll.otlun of a reduction in read speed of the truntimitiaion, when the Q \): n.III, mde m, 4nuellu 21 i? had disappointed position at great vittuw towards a, ro., p1y.nt from a / position, neutral. It results from this that the word oui1 12 slows down to the marnent oui the vehicle potisède a certain torès vl <fWt which tends 4 input the motor like a pump. The 110té \\. T ', functioanont d], nu1 like a pompa, has tendonea to enter' net 'the pump then functioning in wotvur. It results il4ins the duct at low pressure an increase in pressure) which can become sufficient to the area to operate read cUJ.1U! 1and preponderance.



  We first cuneldùror the case of the overload; it is assumed that the common of the year 115 (t1u "1) rotates in the * end counterclockwise, thus causing the plate 100 to pivot in the direction of the vluuilloo one * on. the swash plate. 28 of the pompa in the no, aea uit:

  , using clockwise 9 and then plucking 45 of the engine counterclockwise, the trA "atioeîen then runs at full speed If the tractor is
 EMI18.4
 so
 EMI18.5
 When a load is increased, the pressure increases in 10 duct at high preaion so that the rotation of the motor is subjected to a greater resistance, to the pressure in port 249 which is the port 4 high preauion under condi-
 EMI18.6
 considered, rises above a predetermined value,
 EMI18.7
 the orune distributor 166, associated with the orifice 24, is moved to the right (looking at FIG. I) under the action of the pressure acting through the channel 12 against the piston portion 200.

   This makeshift movement distributor 166 leaks to communicate channel 191 with channel 14 and allows the

 <Desc / Clms Page number 19>

 
 EMI19.1
 control fluid to be admitted into the right end. of
 EMI19.2
 preponderant control cylinder 120; this fluid moves the
 EMI19.3
 cylinder 120 to the right (looking at figure 1), so that the handle 115 remains in its rotational position by a .4 "U3 counterclockwise. As a result of the at-.
 EMI19.4
 placement of cylinder 120 to the right, the distribution plate
 EMI19.5
 tion: lottery rotates in the opposite direction of the hands of a watch.

   The first effect of this movement of the plexus ion is to increase the angle of inclination of the swash plate; 45 of the motor, so as to drive this plate veJ'1f a position of volumetric displacement muximumb in order to fiugmount the horn, while reducing the speed, and to try: * aing, 4 of overgon, "ter 1 increase of the charëe. i;) 1 the increased i: 1, .on 'dl) the load is not overcome pax the uut'. # menttivi.'l of the couple, the continuous mous'musent of the distribution plate 100 in. The feeling r4v *; eo of that of the needles of a showed, brought the plate ofieilloot from the pump to a position of displacement v ') lU1iJqu, n1 ... mum, so that the tr,: An13missio1J. stops acting, damaging the pump will continue to work, which prefers:

  rllQII ('I, u.J'u1t a po ta- page of the fluid through the valve of dt' ohtr6e at high pr4gaiQJ4 12 and consequently a loss of power.



  It is understood that the preponderant command t
 EMI19.6
 also effective when the transmission is operating in, the * in *
 EMI19.7
 reverse; it is not necessary to be able to give an explanation to Duta-Lllée to be able to do so.
 EMI19.8
 



  We will consider the case where the awning transmission *
 EMI19.9
 its speed; it will be assumed that the handle 115 has been moved * rapidly in the reverse direction without clockwise (as shown in figure 1), by rotating the a..1 dispensing 100 clockwise. of a taoztr, Couo DA explained it previously, the first effect; of this p1'Votemvnt of the plate 100 is to increase the tilting anblo of the oscillating pJrattmu r8 of the pompa to blame it for and.

   Zaos.'G.oa ae de "

 <Desc / Clms Page number 20>

 maximum placement; If this happens quickly enough, while the tractor is at rest, the tractor inertia applies a
 EMI20.1
 considerable load on the motor 12, resulting in a pressure self-monitoring in the orifice 24 at high prestoion. 31 the pressure rises above a predetermined value, it again becomes 8u ± tisuntis to move the organ at the distribution 166 to the right, thus admitting pressurized fluid into the right end of the cylinder. 120 overriding control The cylinder moves to the right, leaving one behind
 EMI20.2
 the piston 119 t controls the manulle, which moves to the left.



  Fondant that the transmission takes dtp. At speed, the pressure in the port 24 decreases, allowing the distributor member 16 to move back to a closed position, and by providing the opposite ends of the cylinder 120 with the system of 'evacuation, so that this cylinder can follow piston 119. In this way, cylinder 120 then follows piston 119, but to a controlled degree determined by the pressure trimming in port 24 at high. pressure, so as to increase the speed of the transmission in a controlled progression, by first increasing the displacement of the pump and then
 EMI20.3
 then decreasing the displacement of the motor.

   This occurs eenoo-0, re without any substantial loss of the fluid pumped over the high pressure relief valve 132. which primarily serves to prevent sudden pressure surges prior to operation of the com- ponent.
 EMI20.4
 aundu preponderant.



  Of course, the overriding control is also effective for uU;) Changing the transmission speed in the reverse direction.



  We will now consider the case where the speed of the transmission undergoes a reduction, for example as a result of the displacement.
 EMI20.5
 cowynt of the handle 115,. from the position reached by turning in the sena invermo of that of the biuilltJt3 of a watch, towards the contruio neutral position shown in figure 1. 61 the a, .i.xcc; uEnt of the oiH u .1. quickly fades away, the shift

 <Desc / Clms Page number 21>

 
 EMI21.1
 circumscribing the volume of the 110t \ ll. \ 1 'aUt $ lDt1nte Íaudd1a.te,; ent in rudu., .. thus the speed of the motor.

   However, the Inertia of the round vehicle to drive the motor ftvWl! .O a pampa, and pump 11 itself tends to function as an actor. iiftns this tone "said ion, orifice d3 at low pressure * and ooum, '. # u 1 <pressure, and if this exceeds a predetermined value $ the left tributary ornament ib6 is dvpla3 towards the key (figure 1), of tation & admit the fluid all pressure in the left end of the cylinder 1U der couamunde pxrundârnta. This results in a displacement of the cylinder J20 to the left, relative to the piston 1191 so that the cylinder 1 " 18s8 behind him the piston returned to its neutral position.

   When the prlJas1Qn is reduced in port 23, cylinder 120 follows piaton z Thus, the transmission is brought to rupos or & a speed xi picks up at a controlled rate of decrease, without any noticeable little fluid. on the do4charee valve 1? 2 high
 EMI21.2
 pressure.
 EMI21.3
 



  FIG. 7 represents a variant of circuit- this variant has the advantage of supprieur le cl.J., et-navc'l. 1..0 165 df; 1u figure 10 and combine uvoc each inlet check valve do compansatioa a part of d1stÁut.on fear ixxun 6tra.- orer the fluid heated up read figure 87 # the corresponding parts laying at like parts of tit 1 have been designated by the same reference numbers. to which we added the suffix "prime". Besides, to simplify the description, only the modified portion of the circuit has been shown in FIG.

   it is understood, however, that the channels xi 'and 1921 of FIG. 7 are connected to the parts controlled by the channels z 1, 192 of FIG. 1 and control these parts. ur time. 7. the compensation channel l't0 ', by * as of the compensation pump 3319 communicates with two diatrial compensation scorers <0, each having one ors, a distributor 206 normally pushed to a closed position

 <Desc / Clms Page number 22>

 
 EMI22.1
 By ua tougort 207, During operation the tlu1lÍ passing from unt the one-pressure orifice which is one of * orifices 23 'and <S4', x'eooule through one or the other of the , @ channels 142 ', 143% i through a radial orifice & 0 of one of the distributors.' Oo, it maintains this ortune in the foraoUrw position, while the omptn..tloD fluid blows from channel 1 "tU ' r.puuül8 au-.

   trI orbunl dtributour 20u to a position communicating a rudial orifice 209 with the low pressure channel # which * and one dom Ctannux 142 ', 143', of the sulfon. will admit the co.pnaat1on fluid from the low pressure side of the circuit, Comite dune lu variant described pruoedOMentt the fluid. of ouapanaatiun is admitted in excess of the needs of compensation, in order to cool the 81tb ...

   The compensation fluid and! mkcèo thus admitted pushes the heated fluid from the base side of the circuit through one of the two consulta 211 communicating respectively with the channels 130 ', 1311 and abou- t1sknt respectively to the distributors! 0> The movement of the organ compensation distributor 20b, with a view to admitting the
 EMI22.2
 compensation fluid on the low pressure side of the circuit,
 EMI22.3
 also planes a ruduite portion Zla of this distributor member
 EMI22.4
 in a position establishing communication between the cunal
 EMI22.5
 211 and an el3 mnoci channel leading to the 173t relief valve
 EMI22.6
 As in the variant described above, the heated fluid
 EMI22.7
 .- 'flowing early through the waste valve 17 passes there in bypass channels 175',

   opening into cooling loops and spray heads. the bottom of the transmission housing.



  It is understood that this variant pr88nt1IuYantage to eliminate the need for a shuttle valve by incorporating in and4que inlet check valve the compensation a dietcibutor to evacuate the circuit the heated fluid; it thus makes it possible to obtain a compact arrangement and consequently
 EMI22.8
 advantageous.

 <Desc / Clms Page number 23>

 
 EMI23.1
 



  Figure 8 shows a tr nssii..s.i.04 using a variant prú, i-ondr: rante command. This t'4nl3pe ... includes a 225 swash plate pump and, a 2e6 motor
 EMI23.2
 with swash plate, which are mounted in a hydraulic circuit
 EMI23.3
 closed comprising conduits 227 and 228.

   The mp4- tion fluid is supplied by a compensation pump di44'9 $ which sucks the fluid through a 2JO line from a reservoir ± $ l The compensation pump delivers the fluid 4 through a poo !, 233 communicating with check valves 234, dboUQbt r.p'Q tively in the conduits Gd7 2 * i8 of such aorta that the fictitious dee compensation flows into the conduit at busae reaaon. The compensation fluid, in excess with respect to the one needed to fulfill the functions of compensation and CQ H {4a4 14en .... mentioned previously, is due loaded by a valve do 4Iio .. "r" 43) so as to return to the tank 231.



  The speedû;, e of the neansmidsion is 0 nmndùe in Xjtlu = t vary the angle of inclination of the plut, .... u oscillating -Z4 by 4 powpc and the angle of inclination of the swash plate fa9 To the motor an "'; be a position of volumetric displacement 11.1 niXII \, UI ot a) oIi1", tion of maximum volumetric displacement. The plate o "Q1: q, 1Í 238 of the pump & is adjustable in opposite directions, vet-w maximum volume displacement positions from a neutral central position of volumetric displacement..1u. R.- presented on Figure 8, so that the ttuLde can be pumped through the conduit 227 or the conduit 228 4ulI \ '' '' Kotomy 226 # in order to rotate it in the aeaa direet or in the reverse direction.

   The swash plate of the position pogt qb # nefr motor entered a displacement position volW1lit.r ', ut IQI.i.X, 1 \ 1ua
 EMI23.4
 
 EMI23.5
 shown in figure ts and a position 4u of ipl'ififauwt vo3, u n
 EMI23.6
 minimum weight not shown.
 EMI23.7
 



  To escape) vary the inclinuifioa etUbIs of the fold, <IH \ 1 oscillating 3u # of the pump, we connected this fold by means of a - connecting rod 42 to a sliding tifcje 2 (fJ ending early - , a tulet

 <Desc / Clms Page number 24>

 
 EMI24.1
 Cam bearing 244, Or may also vary the angle of inclination of the swash plate 239 of the motor by means of a dis-
 EMI24.2
 positive comprising a connecting rod 24f connected to a sliding tie 24? ending in a cam bearing roller 4.



  The oscillating plate of the pump and the rotating plate 08. of the motor are both controlled by a single cam-mounted oxüune 20, driven by a reciprocating movement and comprising a slot-cam 251, in ±; abée with the Base support 244, as well as a slot-cam 2> 2 encased with the ale²d'apPu1 248.



  The cam tent 51 comprises a central portion 253t inclined with respect to the direction of movement of the organ zou, and opposite end parts i254, 5 ;;, parallel to the direction of movement of the organ 250. When the transmission is at rest and when the swash plate 236 due to the pump occupies the neutral central part shown the support alet 244 does not find approximately in the middle of the length of the central portion 5 of the slot 251 of such aorta as the more otoil -i lant 236 of the pump moves in opposite directions, seen ru of the positions of the movement va, u.m6; maximum xxcue $ when the cam member 2> 0 moves in opposite directions from its central chip represented.

   At the ends of the cast iron purtlun 253, the slit portions: 4r z55 allow the 5U member to move in a continuous movement without modifying the maximum volume displacement position of the oacillating plate. t7owma as we can see, the ciiapoiiition has the coffee slot 251 Instead of varying the angle of the swash plate of the pump from 1.J..urd to a position of del.camant volumtr.1..jue maximum, while the plate ossc.l, art, of the motor is mU.Lnl.unu in a portion of d 1.1 cuL., maximum volumetric ent, luis to maintain the oscillating plate / year the duos pump its position has no , placement v ", J UJ: 4tI'.L4.UC m4.xirum, penaani that the swash plate of the engine was driven to a |> ouit4.on dl) u.Ópl .... ce1llo.llt volume trique .. mnil1iut so e jaouvvmi nt uu 1:

   ti-ttnsmi., 2! cn. tower

 <Desc / Clms Page number 25>

 
 EMI25.1
 reduce the speed of t-a / l ±: 1ùuon. the swash plate of the
 EMI25.2
 motor is driven first, to a travel position
 EMI25.3
 volumetric and the oscillating pipe of the pump is then dragged to a position of d (pltlcel! 1unt volum ritu.
 EMI25.4
 minimum.
 EMI25.5
 alnimum. The operation described o1-desluu is facilitated by the tent-cam, 2. which includes a central part. parallel to the direction of movement of the ac, r.as bzz4, and parts * extr3meqbppos'es 2590 which are inclined with respect to the direction! of the mcuvem% t of the opnM 2ot so as to r0b1 the oio11- plateau
 EMI25.6
 lunt 239.
 EMI25.7
 



  During operation. the component 250 to cumea is regulated by a manual tool, which comprises an articulated handle <i6O connected to a rod 261 which can slide in a pia-
 EMI25.8
 
 EMI25.9
 ton 262 centered normally by springs 26J '.uns a cylinder 265. Extreme and opposite chambers 261 267 Boni conl3'w * a = tnt
 EMI25.10
 supplied by pressurized control fluid, which arrives
 EMI25.11
 of the compensation pump 9 passing through a pipe 268 '
 EMI25.12
 
 EMI25.13
 and derivative conduits 26yt 270 each comprising a U'trun, 10-
 EMI25.14
 ment 271.
 EMI25.15
 



  Le! Lui.a de'c \; lJ, 1l.l; Ganda, admitted d'.ns les cb, .tmbrej3 206t 267 as we have exli.u6 above-GeSSU81 is normally dosed 4 through the bzz channels, 7 of piston 11 62 and through delivery parts of tib8 261, to opposite ends of an intermediate part, 275 & reduced diameter. The fluid coming from this intermediate part d75 flows through discharge orifices 2661 and through an discharge channel 2676 # tomé by an intermediate portion of reduced diameter of the piston 262.



  When you want to increase the speed of the transmission. alum $ the poirnea 260 is moved upwards, by bringing 8.1081 the distribution tibe 261 upwards to a position, in which the communication is cut off between the channel 275 and the discharge port 2tab ' and communication is established between

 <Desc / Clms Page number 26>

 
 EMI26.1
 
 EMI26.2
 the * anal 7 and the discharge port 66 '.

   The lower room laughs <s6? * and so Miue suuii prexaion, while the ohcabx has over 206 is read back to the Evacuation MynteBte, to dream up a pedestrian 26 upward awning, & the continuation of the tifad ktito OOL1JDI on. ' indicated above, it follows from a-
 EMI26.3
 on board an increase in the volumetric displacement of the pump,
 EMI26.4
 then a reduction in the volumetric displacement of the matrix, linked by Q6'ntt the speed to read trúnsm1'Dion junqulâ its value ma. a: i & 0!. <If we move the handle 260 towards the ba - (figure 8), speed the transmission to ausento ausento a similar raunièrt, Judo the oscillating plate of the pump It displaces. in the direc-0 tloh affixed, starting from a neutral position, in order to rotate the traaa, aralspa.4fza in the reverse direction.



  If the tranu1i11: "'l: 3ion is úuumi6e it a 8ucmtlntllt.i.on of the * beard while it is operating at full speed or at a high V'uelJu8, and if this increase in load is sufficient saftttf puuz, will produce a predetermined increase in the pies- bion in the high pressure duct (this weight being duct 22? if the truneiuaslon operates in the forward direction), the increased pressure boot acts through a channel 260 so as to move upwards , In spite of a central spring 2S <!, an organ distributor 81 for multiplication of torque and of eurpres- which This movement of the dietrbuttor organ 2ti connects an evacuation channel 283 to a channel iiB4 coming from the lower chamber 261 of cylinder 65, and made air.si communicate this chamber midd the evacuation system.

   The relatively greater pressure of the chamber 2bb moves the piston e62 green the beam, returning the cam member 250 to a neutral position, so as to first the volumetric displacement of the engine and the shutdown. Plti in order to try to overcome the heightened load. if the Chft6o is not overcome, the continuous movement of the piston bzz and the organ & cams 250 r5lt.t ensuito. the volma6 '*

 <Desc / Clms Page number 27>

 
 EMI27.1
 pump to zero, stopping the action 4th tran.1st j
 EMI27.2
 
 EMI27.3
 sion, but without pumping fluid on an eqabe valve.
 EMI27.4
 high pressure*
 EMI27.5
 Although the downward movement of the piston 262 1 # ± $ *] killed as just explained while the Q;

  bné. 4Q remains in its upper position, connects the cana). $ 2? 2 i Qft1ft. ' Drain T 266 ', the constricted nature of orifice 414yeeuatiq;% causes fluid to flow less rapidly from chamber 266 than it does from chamber 367 to tta. to the relatively free channels of the distributor 61 qe overpressure coupling.

   So the piston 262 can return :? ±. in pgei "
 EMI27.6
 neutral.
 EMI27.7
 Hifett of course that the command prep9) ftd <àrttûi d written c-desuus is also effective quad do
 EMI27.8
 the load applied to the transmission was carried out pedantically: that
 EMI27.9
 this works in the menu lnvetrooo Ri we move the handle quickly? 6p "e1: 8 aa pU Iii" "! tion at full speed in the forward direction, Qia caUM.n1;

   a * 41tZ "" "men1mtion of displacement volume creek of the pump, a .l.na1int. or resistance, appreciable is opposed 114 motor -Pifr iswte of the inertia of the tractor, a resulting increase 44 the pr <i # i
 EMI27.10
 
 EMI27.11
 sion in the milk duct 277 operate the dietrb4tt) ur, 81 40
 EMI27.12
 
 EMI27.13
 multiplication of torque and control of eurpctiae + çn, c * 4 # ei has been explained above, so that es disijiritoutKJur tends to return the piston 6J to its neutral position until eo that the pressure follows reduced in the conduit '4H7r Apd.

   a pressure increase in this duct, the piston has a tendency to move towards the ti6o 261, although it may be found e # your4r by top- port to it, In this way the tranum1ujn prund de lu th velocity at a controlled rate of growth, or unwanted fA ciii 4i tion, in which fluid 4 a time + Qa .xçQz1 life is pumped over a valve; of dúchaX't:,; 6 causing a!,:

   r,:. 'trij de
 EMI27.14
 power.

 <Desc / Clms Page number 28>

 
 EMI28.1
 Of course, the overriding command is
 EMI28.2
 also effective for quantifying the baud rate
 EMI28.3
 dune the reverse.
 EMI28.4
 In the water where we peel read the) o4bnea 60 quickly
 EMI28.5
 from a full speed position in the direct sena
 EMI28.6
 towards its central nutrepré8entée position, and where the inertia of the vehicle tends to drive the motor and a pump, so that the fluid delivered to the motor tends to tozzo the motor pump, an increase in pressure occurs. produced in the duct <.! 28, which is Mioxa at low pressure, If the preouion rises by the conr.uit? .Ib above a predetermined value,

   corresponding to the centering spring b2 of the torque multiplication and CODIJIIM distributor ctil- ue de uurre1: .10rl, cutto preuulun dismantle the distributor 81 Vt11'f ,: lu biim u "3u ', un ,: puoitàoi4j dz, 3 which it connects the channel; .1'Ótucu., d, J. OR 4 4 a channel 2b6 commu.liquunt uvec the upper C1Ht.mb'e * duo. The prulcioxi dinz the lower chamber Prior fa7 becomes:: xïn. i .r (; 1t1 '{Il, cnt .. l.lu ..; tr, nut; et. untx.'tnl1 the piston had towards the naut, by r.port & lu tie 61. I such aorta that the piston leaves the U-shaped shaft, 'the.iu.'6 and returns to its neutral position with a cULund6e vittuus.



  Leaflets of 4u'chui.-be with high preuaxon 2 & b commuai ... as for r.ctiv eI1t "seen leo channels 7. 'ad8 pur the intermediary of the pipe 2b9t so that the abrupt uutmuntatiune of the ob Preucion # se produced by the intervention of the prpoud6rantu command, are evacuated on the low pressure cStu of the circuit.



  The .fi .... U! '\) 9' Óprt4lJellttj another circuit using a modified overriding control, which includes a rotary cam
 EMI28.7
 to vary the inclination of the swashplates of the
 EMI28.8
 pucipu and; of the motor Unu dúpltC whose vOlumét: 1. '. variable ic is by buii p!;, IttUU oscxllont rÚi, l, lblo 3Uu articulated in

 <Desc / Clms Page number 29>

 
 EMI29.1
 '01. and a variable speed motor is driven by its swash plate 0 <.! articulated in 303.

   The pompu and. the eoteuy are 1.nt'ir <lalê. in a 1.1 'hydraulic circuit.' including f
 EMI29.2
 
 EMI29.3
 the opposite sides have by curved orifices * jJ04 and 3ODe Compenuation fluid is supplied 'you side * ba <me prtmalo.u of the circuit | from a reservoir 307 and at the solexi 4 'a pumpa of CQJlp4msation 08, which delivers the fluid through a conduit jiO9 into the valve. of roteaue of cQmpn8at10n 310, The fluid could; in the orifice at high pr 3aioo 11 (.1nhent the 014. pet aauoeié 10 f <'M6t slums that the fluid of IH / II, Onatiiun, VI- & .unt of the pump J: x 308 opened the valve 310 associated uu low pressure side of. aircu1t ..: 1n admit the compensation fluid,!
 EMI29.4
 In this one.
 EMI29.5
 



  In order to be certain that the compensation fluid & r1'1 "ve dano the iiydraulliue circuit te) .Q) .6. Avatl.t dO 1II.j." r J. v (I'r
 EMI29.6
 duna the control circuits that we will describe, a distribua
 EMI29.7
 turn of sequence of c \ "II1J, penaat ,, on J512 is normally * 41nteau un
 EMI29.8
 
 EMI29.9
 closed position, by a spring 313. When the component assembly is adequately supplied to the closed circuit, the pressure acting, through a c & nal 314 moves the dis "trbutur 315 up to a position in the latter ± said
 EMI29.10
 
 EMI29.11
 communicate a channel jl6 (ÁVoc a channel it? ending in the circuit)
 EMI29.12
 control.

   The fluid, in excess of that necessary to achieve the compensation and the control, is released by
 EMI29.13
 a discharge valve 318 and returned to the reservoir 307 through the inter-, itédiaire of a duct 19.



  The reèila "" c of the oscillating plates of the pump tu the motor is controlled by a rotary cam 325 which supports separate renten-caate 346j fê1? , respectively controlling the swash plate 3QO of the pump and the swash plate 302 of the
 EMI29.14
 engine.
 EMI29.15
 



  The all-cam j6 has a central section 328t eccentric with respect to the pivot; 9 of the cam j5. so that

 <Desc / Clms Page number 30>

 
 EMI30.1
 flee *, .l1N, i 'the anal $' inclination of the plateau QSQU1; lu't = 5QQ dam dta dls-eauons opposite 4 from the noutt-rt position repeat when the costa; 5 twul nû reapetively in opp9 directions "Hua from the central position rU. \ IX'l.1oontée. L> 1 tonta.caw.



  6 takes aUtJo1 dos parts oxtr3mea Ql '{H.u.hu 5,, 0, which are coac & triuaa or j'ivott 5a9 # de tçQn à = u1ntonir le oncillant 3w in due positions, placeml) tl1. maximum trique volume - MUm pfndunc read recëlae of the plate 01: 1 0111 ± l.1: It; $ Q2 of the motor, The folitu-come, 7 includes a central part, which wa'apaceaitriquo ± tU pivot Mt of tu ... on. at mziintsalr the; la.tuau. omoilletnt t> 0 >> of the motor dune the poiticn of the d4, pllcemQnt volu ... to hard I1.1f) .X1tlUI1. represented # for 1. ' rjt> llt: ie more uuu ongillai2t UO from the pump. and oppoe4est extrtmoo parts that have! cucQeontréo8 with respect to the pivot and which make it possible to iréglex1 the rather 8Q411 & nt of the motor between the position of displacement Vûluraûtï-i'-iUt r4;

  .xiIl1UJa .t "eln.'8.nt.é. and a position dl) minimum volumetric displacement, while the pluto4u osc.llant of the pump is iaaiateau tîxo, The tentos-ca # .. j. 7 receive respect4Avement duo support ttict 333, which are respectively connected by bid11eb j; 4. 5 to the oncilluntu plates 3ou and J020 The pivoting of the obi% * 325 and obtained by means of a piston. reciprocating movement 3317 $ carry duo teeth in engagement avet 4 .. beginnings of the oane 3256 This piston 337 is nomleueat centered Pa pot dus reauqrta 338 Mounted in pressure chambers located at the opposite txtrêoitéo of the piston.



  During the operation) the fluid of communia under through the channel 17. the channels to the bypass prevails * and directed normally by the pump of cu4, pushing / 34 (j and: the openings 3400 Up to the chambers 41, 42 cutttenaut the reasurts 338- i-our uU:} I, 'ut; ol' lu speed of the trans xu4eaipn in the direct direction, we avoid turning the well 34> clockwise to the position shown
 EMI30.2
 

 <Desc / Clms Page number 31>

 
 EMI31.1
 in figure 9 of fligon to discover a channel and rural dtévasuabe tion 346 in a distribution plunger 347. It follows that the chamber; r4 ,: is evacuated by a rod channel 348, a channel 349 of the pi-.ton and a channel 35 communicating with the evacuation otitis * j> 46.

   The relatively greater pressure, exiat, Urat now in chamber 341, drives the piston $ 27 ver * read right (figure g) t by rotating the cam 3a5 inti the reverse links of that of the aluuillou of a montra , dt zanlère to first rotate the plate rsxcil7 unb 3u0 of the pump to a volumetric lüpleacruauzC Pogi- tion muxiaua, and then to drive the swash plate 304 of the motor to a displacement position minimum volmootric. This movement of the piston 33i forces the housing 352 to copper the pedestrian by moving it on the plunger 347 to a position, at which the naked tvCUation46 orifice communicates more with the channel '0; At this point the transmission reaches a state of equilibrium.

   As a result, the curved port 305 is the high pressure port, while the curved port 2G4 is the high pressure port.
 EMI31.2
 pressure ring.
 EMI31.3
 



  To reduce the speed of the transfer, the handle 345 is rushed towards the neutral position by turning it in the opposite direction to that of the aibuillos of a counter; an éu-nglé discharge orifice 353 is thus placed in communication with a channel 394, and the pressure in the chamber 341 is consequently reduced, so that the piston 337 moves green to the left (FIG. 9), causing the cam 325 in the direction of;
 EMI31.4
 
 EMI31.5
 clockwise up to 1 position shown on the
 EMI31.6
 drawing*
 EMI31.7
 It is understood that one can aut, .., lie the speed of the transmission in the opposite direction, by moving the poî-
 EMI31.8
 
 EMI31.9
 6th z45 in the opposite direction to that of ai ,, u-llea of a
 EMI31.10
 
 EMI31.11
 be from a neutral central poaitj-on.

   Are we using 356 and 35 distributors? by sulr.iplxa '

 <Desc / Clms Page number 32>

 
 EMI32.1
 t.ion of torque and overpressure omuaande} each of them ooM "jt'rttnd an organ ttv dlatl'ibut.1un i $ i> 9, .uuho.ité normally; towards a closing position for a Jw spring. Obn'Juo diatribu- lput owmprun4 an enlarged portion piston parts 361 are submitted by the ..nt, orlG'J \ ll, 1st ruspeetivument of the channels 6,> U3 he read the pressure of the! Uu14e the <.. t ', ; u: .. nl. daM le u-l'icMa 304 and;} 0 Jt.1no1. dtng le or where an a.ut;

  , LUunt.I.1t.1.Qu du preualon its produced, from one quicunqun of 3 channels jtiet frï until above a pruumioul <iwfcwr ln6 f in advance pt.r the head} of the springs 360 # i'oin appropriate dietr4buter 359 is male * the resistance of the r.üort 36u, until a punishment, dunu luuelle It makes communicate a channel of tibe 365 with a channel jbbi the two channels 36b respectively open into the rooms 41,, 't4J. at the ends 111.oilétf8 of piston J47à The channels 365 eomatU "ni4u * iit roupectivument with the channels 3ubt uboutiusant to the evacuation channel 3190 The cumaunde distributors 56, 57 functioned 0onUbly from the same ItbuiiJl e îïuo the distributor 2bel described p.t 'Q "of [.lI1o;: nt a reference 4 la t1cfu.'ob, of l \;

  jn1 \, u'e to achieve a preponderant Uviuaundu, which takes 4 its cut read as
 EMI32.2
 swash plates, previously worn for manual control in the or $ where a load increase is applied
 EMI32.3
 the transmission ensuring that it works quickly $$ * maxïjgat in the event that the transmission accelerates its Bouvutaent,
 EMI32.4
 and if the transmission speed is reduced, if
 EMI32.5
 the pressure retaining in one or the other of the curved ports ± 04.05 outweighs the force X't; b), e of the springs 360.

   In
 EMI32.6
 predominantly functioning in all three conditions
 EMI32.7
 the arrangement in figure 9, the control, / specified above, for controlling the swash plates, in the same way that
 EMI32.8
 these August ordered, under similar conditions, with the
 EMI32.9
 arrangements shown in Figures 1 to 8. Thus, it will be understood, the touching of the preponaurante command of the transmission delu figure gt by referring to the explanations above.
 EMI32.10
 

 <Desc / Clms Page number 33>

 cedants relating to the orders shown in figures * 1 to 8.



   In the variant shown in figures 10, 11 and 12, a differential transmission, comprising a differential train of gears, achieves a wider range of speeds.

   The hydraulic circuit, associated with this variant, is similar to that used in the embodiment described on
 EMI33.1
 Figures 1 to 6, mUJ, fJ'he not include a "neutral" distributor 1;

  > 2, does not use overriding control, 119, 120, and finally does not include distributors 181, 182, torque multiplication and overpressure, as in figure 1.
 EMI33.2
 bi on 60 rfùru in figure lüe we see that the trans- mi ûa.04 comprises a housing 7 containing a pump 3Ut) j76 and a motor 77 The pompti compiund a cylinder block 3780 which is fixed on an input shaft and 379 pump drive,
 EMI33.3
 4 turn uv this one. this block 78 comprises cylinders dun4 lequttlu of piat.on 381 can move in one movement 1tttl'nl.t, j t ot. To cooperate with a plate oac. \. llùnt 282 with variable angle angle.

   Cylinder block 378 is spring loaded against a timing plate 384 pinned to
 EMI33.4
 a central distribution block 3d5; the cY1Íhros 380 have orifices which communicate with inourveo orifices cob 1Jlt..m (jntúÜo (J 3b7 and 3b8 (t1u'U.re 11) of the plate -the distribution 3b4 and. of the distribution block; (j ; 5, so that, when Io cylinder block j7U tvu. (. 'Nt1, fluid is supplied to the pump through one of the curved orifices, t leaks! Is discharged out of the intermediate ptir of the uutro curved orifice.

   The shaft Jlontl ',! NVu ... nt of the pump J7,) comprises at its own end canelu- in .'trieureij rl: / J /; -; V or an equivalent diopouitif allowing it to be connected to a source uipi oprii '-e of input pnimaneo pxxzxxxyxx, consisting of a motor, for example a Liotour à c "mbU ± Jtion lnturne such, Iuu those 1I1unta t.1n-valument on the tele-v64lculJS as the tractors.

 <Desc / Clms Page number 34>

 
 EMI34.1
 



  The 377 engine includes a 19ffi cylinder block. comprising 3V4 cylinders, in which SI5 pestles. anims of a reciprocating movement, cooperate with an oscillating p1tq 3V6 with variable angle of inclination. Un ç sa <? R1? ; 97 pushes block 393 against a distribution plate. 3, jdg or; - looted from the central distribution block J85; the cylinders have orifices, 9. who cooperate with the orric # 4 bzz ourvei. 387, j68 during the rotation of the block 39> e Ce \, 1), (; 11; gme V fi ..,. Xed so as to rotate with a tubular output shaft 4yQ. Which is concentric with an extension of the shaft input J79 4i
 EMI34.2
 the pump.
 EMI34.3
 



  The; oscillating vlat \: 811 382 of the poopo * and j? 4 antularly in opposite directions from (the its neutral central position represented, so aoro that the pq po can deliver pressurized fluid into the a P4 uses holes 387i,; 8t in order to actuate the binding nctor.! l, t its # U ", UV] or in the reverse direction.

   The swash plate 96 of the motor can be adjusted from its displacement position: VOll, lUIJt '+ u, 8 <otX *,': mum shown in the drawing, up to a position eto d p3, uçt
 EMI34.4
 minimum volumetric *
 EMI34.5
 The shafts> 79 and 4DO of the pump and the word * 4r oQ;% t associated iii a differential gear train 4U5 $ which tests a planetary 406, fixed on the pump shaft; 7B da flt> uçoa 4 <fou -rfin with this one, ut a toothed crown 407 in prhe with my pinion 408 in order to 4 turn with the shaft 400 of the Major.

   A planet carrier 409 is formed in the 1: UUJ 'do the shaft 410 of the transmissions output it carries autolltoa'4119 in mesh with the planetary 406 and the ouuroone 4' input 40 ?, During the operation of chain trnpfl;:. 1 (nf CQ; '' '' taking 1 & pompa, the coaxial motor and the train diJpftSr / nt; i 3, dl enbre, coaxiul swimming with the pump and the motor, 01 the p '!. tof or - winking 382 of the pump would have maintained in the po: 't, 1.vn <: c'TI.'u.1Q neutral represented, pen.dm.t. that the frbre, 7 "J \ 1 .., the PQr44) (tv ..:

  no,

 <Desc / Clms Page number 35>

 
 EMI35.1
 the motor is not driven, because the pump is not fixed, the toothed ring 407 is fixed, as well as the cylinder block of the motor, and the sun gear 406 of the shaft 79 for driving the motor. pump drives the output shaft 410 do the tp% t, <! "'mission in the direct mens via d .., t.111t ..



  411. If we now assume that the swash plate bzz of the pump is tilted in the desired direction for 'nt.r Io cylinder block 393 and the ring gear 407 inpno direction opposite to the senna of rotation of the planetary, the speed 4Q 3. '6I, JI'br, output 410 increases. On the contrary, if the platu Vi oscillated from j
 EMI35.2
 the pump is tilted in the opposite direction from. (The his position
 EMI35.3
 neutral, so as to drive the cylinder block ';, 9 and the toothed cylinder in the direction of rotation of the sun gear, the speed of the transmission is reduced and can be IU). ", j.to 1nvel, .6 ... i The adjustment of the angles of inclination çlog plat- uux <ecil "slow $ 8H 596 is controlled respectively by a phr-j ton jacks ec cylinder 415, 416, similar to the jacks SO tit 51 deat tgq #. res 1 to 6.

   The cylinder 415 is articulated in 4X7 iluv 9 plate '1 $ "" winking of the pump and in 419 on a shaft oeux 4 Ç' $ 'X'1 \ f 11), The cylinder 416 is articulated in 421 on the plate ç , c1: U, u1 '! t of the motor; it is also articulated at 422 on the shaft 414 in the Middle 4 # with the arm of a double yoke. The fluid is admitted into 3.0 ydpin 415 through a bore 423 'of the shaft 43.8 and terminated by the radial ports 423. It is admitted into the Io verla 416 through the bore 423 'and radial orifices 42 * # The fluid is discharged from the cylinder 415 through an orifice 425 and from the cylinder 416 through an orifice 426; these two o1'qe. are 'oott' mandated by a 1> 16, u-shaped distribution tQD.u. # o 47, have been pivoted at 428 (figure II).

   This plate 427 includes a peripheral part, which controls the dispensing orifice $ 42 j $ this peripheral part has a middle part; t3Q% to effect the adjustment of the plate 080111unt 3eZ in back Q4PO- des from the neutral position - the eprfi; aent60, qU4r.d la 1'1I, lt "'\ l 427 rotates respectively in op-ioaean directions î> {i4.Hii'

 <Desc / Clms Page number 36>

 of the position shown, this peripheral part also comprises opposite end parts 431, which allow the swash plate 382 to remain in positions of maximum volumetric displacement during the adjustment of the swash plate.
396 of the engine.



   The distribution plate 427 also comprises a peripheral distribution part, which cooperates with the orifice 426 to control the swash plate 396; this periphery part which comprises a median part 435, concentric with the pivot 428, to maintain the swash plate 396 in the position shown of maximum volumetric displacement during the adjustment of the plate. oscillating pump, and opposite end parts
436, eccentric with respect to the ivot 428, to set the swash plate of the motor in a position of minimum volumetric displacement, while the swash plate of the pump is kept fixed.



   The pressurized control fluid is admitted into bore 423 of shaft 418 by means of a compensating pump
438, mounted in housing 375 so as to suck fluid therefrom. The compensating pump is driven by a toothed wheel 439, in mesh with a toothed wheel 440 of the pump drive shaft 379.

   The compensation pump delivers the fluid through a duct 442 opening into the bore 423 at 443 (figure 11); it also supplies the compensation fluid to the closed hydraulic circuit connecting the pump and the motor enaemole, through the intermediary of a conduit 445, extending from the bore 423 and communicating with a collecting chamber 446, which communicates separately with two check valves and compensating inlet 447 urged by springs;

     these valves communicate respectively with the curved orifices 387, 388 by the internee. say channels 448. It is understood that the pressure, exerted in the high pressure orifice, which is one of the two orifices 387,; dU, acts behind a check valve via a channel 449, so as to keep closed xxx a check valve

 <Desc / Clms Page number 37>

 
 EMI37.1
 naked, while the fluid of COIl & jkr1t, at, LOn under prxjsion opens the other chpet, so as to bring the fluid of cIJlllp8ndatiou j to the base side * pressure of the circuit.



   The compensation fluid is discharged in excess of the needs.
 EMI37.2
 care, * 'of ctQraren * at.txi so as to achieve the cooling, i totamocin sees it them * the figurai, by unleashing the shauffe fluid z through an olapet-shuttle 4Oj (figure 12) and a valve' * unloading 4 $ li low pre :: i0u (figure 10). If we consider the t1- ure Ht we see that the curved orifices 5Es ?, 384 communicate perfectly with the channels 42, 453 and that these channels comvau niquect re6pccivem $ nt with chestnuts 454, 455 (fibers 10 and 12), which emerging respectively dms of annular gorfaee, 456, 457 of a rli3sa, e 459 containing the shuttle valve 450.

   Bypass channels 461, 462. respectively extend from bores 454, 455 to opposite ends of shuttle valve 450 so that fluid on the high pressure side of the circuit moves the shuttle valve. 450 to communicate the low pressure side with a. channel 464 leading to the
 EMI37.3
 discharge 451 * The fluid discharged through the d6cbg valve.



  451 'flows into channel 465 (Figure 10), which connects with bypass lines terminating in cooling loops * and spray heads (not shown) similar to those shown in Figure 1.



   Sudden increases in the high pressure of the ayatea are discharged from the high pressure side to the side.
 EMI37.4
 base * pressure via relief valves 466. The pivoting movement of the plate 427, cama..andant lea jacks 415 and 416, is read again by means of a connecting rod 468 (figure 10) articulated on the plate 427 and on one arm hanging 469 from a.
 EMI37.5
 rod 470, which is slidably mounted in the housing 575 and qu3. c t 'connected to an appropriate manual control handle (not shown).

 

Claims (1)

CLAIMS 1. hydraulic transmission, characterized in that it comprises a variable displacement pump, a variable displacement motor, conduit means connecting the output be the pump to the input of the engine and the output * of the engine to the input of the pump, means controlled manually and which can be actuated selectively. in a first way to increase the displacement of the pump and to decrease the displacement of the motor in order to bring the motor to the output speed Dezirée, in a second way to maintain the displacement of the pump and the displacement of the motor in order to keep the output speed and torque and, in a third way, to increase the displacement of the motor and reduce the displacement of the pump in order to reduce the output speed, and a substantial overriding control & an increase in pressure in said duct means above a predetermined value during one of said ways of operation in order to overcome the manually controlled means for controlling the displacement of the tube. pump and motor. 2. Transmission according to claim 1, characterized in that said predominant control is sensitive to an increase in pressure in said conduit means due to rapid movement of said manual control means during said first mode of operation. , in order to control the pump and the motor to modify the displacement thereof and bring the transmission to the desired speed to a degree of control, keeping the pressure in said conduit means constant. 3. Transmission according to either of claims 1 and 2, characterized in that the means * Manual * control include a control actively associated with the pump and the motor to first increase the displacement. of the pump and then reduce the displacement of the motor in order to bring the transmission to the desired speed $ * during the first, operating code, of the <Desc / Clms Page number 39> EMI39.1 manually actuated means for actuating said control 1Jt, comprising a handle, a link connected to said com 4r4q and a normally rigid piston and cylinder device chirping together with the handle and the link; said pe4pedà rante control comprising valve means responsive 4 a 4; 4elenti% - "tion of pressure in said duct means ftU" d, es, 8, us of a $ predetermined value due to. a rapid displacement .d.t; /: f)) '.. r.1J 40 manual control to admit the control fluid lun4; #dit. cylinder in order to move relatively the piston ot lo 9Y1;, ndr8. and therefore to move said control for a transmission at the desired speed under a controlled degree such that the pressure in said conduit means does not 4 <'by * pu $ - EMI39.2 said predetermined value; EMI39.3 4. Transmission according to claim 3, characterized in that said conduit means comprise conduits connecting, respectively, the output of the PQI <P. ' at the enta dw tttotouv and the exit of the motor at 1'.Itréu of the pump, said rans iB3ior comprising means actuated by fluid ro; kde 4 4T plate44 oscillating pump to modify the angle of the post oooill * nt dlij \ 'in opposite directions from a neutral position, in order to operate the motor forward or in reverse, 4 * 4 fluid controlled means connected to an engine swash plate to change the angle of said swash plate in order to of 1'QQ (1t'tr the torque of the motor, said commanda being associated,! i: \ p; q11. ' dole My K $ controlled by fluid to first increase 19 displacement 4 'U pump and then reduce the displacement of the motor for 1U.ntr the transmission at the desired speed, said means cq = 4ndéA m4nuol, lement comprising transfer means now name lr nt the "said fixed piston in said cylinder upon displacement of 14dtm the handle, said valve mcyons pl" ÓpOntJt) ;, 4ntG comprising a pair of pressure sensitive valves, a joint .uniLJI.1mt evge each duct, leudites itwx valves, steiziiblea uno aunt- tion of prosa1on in the duct at high *, pressure due ..l, HU t ,. 14, lila- coinent rapid means coiuaundjSs mùnuûll ';!:.') '' !. <Desc / Clms Page number 40> EMI40.1 5. Transmission according to claim 1., characterized in that / said manually controlled means comprise a EMI40.2 8 servomotor intended to increase the displacement of the pump and to decrease the displacement of the motor to bring the transmission to the desired speed during said first mode of operation, and EMI40.3 manually controlled valve means COIDmund4nt said servomotor, said overriding control being sensitive to an increase in pressure in said conduit means due to displacement. EMI40.4 Quickly run from dit 3 manually controlled valve means in order to control the servo motor to modify the displacement of the po: .ipe and of the motor, t3 or: .J a greater degree, u1d6, keeping the pressure constant in said conduit means. EMI40.5 6. Transmission according to claim 5, characterized in that said pump is a swash plate pump and in that said motor is a swash plate motor, said duct segments comprising conduits connecting, respectively, EMI40.6 the output of the pump n the input of the motor and the output of the motor t't the input of the pump, said servomotor being connected to the two swash plates in order to first increase the displacement of the pump and then reduce engine displacement to bring the transmission to the desired speed, said overriding control comprising a pair of pressure sensitive valve means, one of these means communicating with each duct connecting the pump EMI40.7 and the engine, said valve means being sensitive to an au8;, - pressure in the high pressure duct h. due to a rapid dtIjl <-lceml.H1t manually controlled valve means. in order to udsi.ugt.ro of the pressurized control fluid in said scared ovo-motour brought? transmission at the desired speed under a dopre co (a .. 'ind <5, keeping the pressure in the pipe constant at high proaaion. 7. 'The rtJrwr; inaion according to claim 1, characterized in that said overriding command is sensitive to an increase in Prussian described at 10 average di ts led due b, a char' ;; ra ecrue aur leu ru: JI: Ü :: HSio! 1 during lodit second function wade- <Desc / Clms Page number 41> EMI41.1 noroont) in order to first increase the displacement of the motor to overcome the increased load and then to reduce the displacement of the. pump if the increased charm * is not overcome, EMI41.2 6, Transmission followed by claim 1, curéectfir.1- sée in that it comprises dos means intended to vary the displacement of the pump, means for varying the displacement EMI41.3 ment of the motor, the means co = aridds manually placing the means of modification of displacement of the pumpa d: .iis a maximum displacement position and the means of Modifying displacement EMI41.4 Mount the motor in a minimum travel position for 1 #! said second operating mode, in order to actuate consequently EMI41.5 the transmission at full speed 8 30, said preponderant command being sensitive to the increased load imposed on the transmission and corn *! directing the two displacement modification means of fcon to first increase the displacement of the motor to increase the torque - and, then, if the increased plumpness is not overcome, to reduce the displacement of the pump, EMI41.6 9. Next transmission; claim 1, characterized in that it comprises fluid control means for <no * 'to delay the displacement of the pump, fluid means for modifying the displacement of the motor, said control means EMI41.7 manual controlling the so-called Fluid Controlled Means for increasing pump displacement and reducing motor displacement in order to achieve high speed operation of the transmission! mission, said predominant control comprising a servomotor control by fluid to exert a predominant action on the! EMI41.8 manual control means, and valve means responsive to the increase in pressure in said conduit means due to the increased load on the transmission, to admit fluid into it. * EMI41.9 said servo-motor in order to first increase the displacement of the motor to ourinotitate the 4deput cliurjre and to add more coating 14 to the pump in the event that the load aecruo is not increased. EMI41.10 10 * Transmission according to claim li caract4ti- ', <Desc / Clms Page number 42> EMI42.1 844 in that load3.ta conduit means comprise 'your first * conduit means connecting the outlet of the pump and the antrum of the EMI42.2 l.lùtfJU1 ". must seconda means of conduit joining the output of the motor and the input of the pump, said transmission comprising first means col't'l .: 1, -, ndés per fluid to modify the displacement of the pump; back second means commands by fluid to code the EMI42.3 moved from the motor, said manually controlled means controlling the said means being actuated by fluid to increase the displacement of the pump and decrease the displacement of the motor in order to obtain high speed operation of the transmission, said manually controlled means comprising a handle, a rod acting on said fluid actuated means and a EMI42.4 normally rigid piston and cylinder device interconnecting the handle and the rod; said overriding control comprising valve means responsive to the increase in pressure in said first conduit means as a result of the tank EMI42.5 to increase the flow to admit control fluid into said cylinder to relatively move the piston and cylinder in order to first increase motor displacement and then reduce pump displacement. 11. Transmission according to claim 10, characterized in that said pump is a re-swash plate pump. EMI42.6 tertlct and said motor is a swash plate motor, said fluid co-actuated means being connected to the swash plate of the pump to change the angle of the swash plate in opposite directions from a neutral position to operate the motor forward or in reverse, said second fluid actuated means being connected to a motor swash plate in order to change the angle of the swash plate to change the torque of the motor, said means controlled manually EMI42.7 comprising its release means normally maintaining the fixed piston in the cylinder during movement of the handle, said command preponJrf., nt8 comprising a pair of sensitive valves <Desc / Clms Page number 43> EMI43.1 under pressure, '' one communicating with each conduit means, the valves being responsive to the pressure signal in the high pressure conduit means due to pressure to admit control fluid under pressure into said means; (yltn1 dre to relatively move the piston and cylinder in d; ug-i ment the displacement of the engine and then reduce lç ddpl4cQ- EMI43.2 ment of the pump. ' EMI43.3 12. Transmission according to claim li c.% C ized in that it comprises a servomotor 4,, enco the fs-çen h, increase the displacement of the pump and dimlag-r the 'plcent. 4 $ engine to obtain an operation 1 * 1 large it9 4 .. 1 * tr, f4n "'" mission, said manually controlled means comprising 4i manually actuated valve moms contiAnd4i; it J .. & 4rvo ... mq .. . tor to bring the tranumi3sion to the speed! Ou1UB adtt cpc preponderant command comprising two sonal valve means, blog 4 the increase in pressure in said l11oymu of ClI; 'Pt: \ 1i Q, 1;' an increase in the load on the trananiaaion for 4eqt * v * of the commando fluid in said servo-motor in order to auenfo 4 on board the displacement of the motor and to reduce ontiuit, ifl 1% Û4s> \ a, <tmqn% EMI43.4 do the pump. EMI43.5 13. Transmission according to claim 3..2. apac "térlade in that said pump is a reversible swash plate pump and said notor is a plate motor OOe444nt, # 111 \" said = yen of conduit comprising dee conduits connected * r ,, p.ct1Vt .. ment, the output I the pump at the inlet of the motor and read, taken out of the motor at the inlet of the pump, said:. \ orvo "motqur 4t.ant rPl4 winter to the swash plate of the pump and the Qûelant plate of the engine, lesdita valve means C: CIU,;) ol't; .rt 1JXW pairp do or popes nensibleu to pressure, 'a common praising, aypr, each con-i- duct connecting the poapo 9t lu engine, said valves being 'n <! - siblea to the increase of pn.?!\3ion in the duct at high pr. *., * - sion due to uccruc load, in order to said, t; Oî'YOf "turn da f {we have; lcnt, r JO drlJ.cc: Motor ncnt Ride -oun-enter <Desc / Clms Page number 44> increased load and then reduced pump repositioning if the load is not overcome. 14. Transmission according to claim 1, characterized in that said conduit means comprise first conduit means connecting the outlet of the pump and the inlet of the motor, second conduit means connecting the outlet of the motor and the inlet. pump, said manually controlled means increasing the displacement of the motor and reducing the displacement of the pump in order to reduce the speed of the transmission during EMI44.1 said third ml) mode of said command p% tt1pondt5 "1" r ± 'hte 4t..mt responsive to an increase in pressure in said second duct means above the predetermined value of the !; h a rapid displacement of dim ml) yeR; 1 cmnl: l.ndé "manually in order to control the. pump and motor to modify the displacement EMI44.2 do this and reduce the speed of the transmission to a controlled degree such that the pressure in said second duct means does not exceed said predetermined value. 15. Transmission according to claim 14, characterized in that it comprises an associated displacement control. EMI44.3 activotaont to said pump and to said IllotErur, said manually controlled means comprising a handle, a connecting rod connected to the said control and a normally rigid piston and cylinder device connecting the handle and the rod between aisles; said com- EMI44.4 I.:I11do preponderant comprising valve means 6 * noïbl.t3o e a uU '; Ir.ontùtion of 1,, uLuiort dalls e: Jùit <J second means of conduction <.1.u ... Game: .Hl: 3 cte said predetermined value due to said displacement: rapid debita ioOyùUO couaundési uanuolleaiont in order to dl. \ ottl "1) of the fiuido do Cu: .4..nda d <. &. uu said cylihdru to move relatively the piston ut the cylinder and therefore move said command ! do JJli.lCÎ.1! .ltjllt J) Cu! ' reduce the vitoawo do la to a degree of the tullo .orto qnu the prosoion in said seconds t..uy: id <) led lu d I !, "', JI) p: J.13 the value pr t: d 6 terminated. read. ïraruuiualon following the l'c ", oh'lic: .tt: ,; n 15, char- <Desc / Clms Page number 45> ized in that said pump is a swash plate pump re- EMI45.1 verible and said mot'aur is a swash plate motor, 1 & dîto tranemiotion comprising means controlled by fluid read back to the swash plate of the pump to change the angle of this swash plate in. opposite directions from a neutral position in order to run the motor forward or in reverse EMI45.2 se, fluid-controlled means connected to the oscillating plate of the engine for modifying the angle of this swash plate in order to modify the torque of the engine, said displacement cO 1.I1Fnd ..- associated with the two fluid-controlled hubs to first increase motor displacement and then reduce pump displacement, in order to reduce transmission speed, mo- EMI45.3 yonu commahds uanueilernupt comprising sensing means now nortiaiom6nt the piston fixed in the cylinder, said preponderant valve means comprising a pair of responsive valves; to pressure, a colJt11 \ .u1ir, ub.nt with each of said conduit means, said valves being responsive to the pressure in said second conduit means above a value-1 their predetermined due to said will move rapidly d3 moyoni3 cotstian- ds manually ± 1., ::: 1 n of it.dmlJttre of the control fluid under pressure in said cylinder to relatively move the piston and the cylinder and therefore move said control of displacement * - EMI45.4 ment of how we fled. reduce the speed of the trur. split z a deeti comr, andée so that the pressure in said second mo '* yen3 da duct does not exceed said prd6ter.Jin6p value. 17. Transmission according to claim 1, characterized in that said conduit means comprises first conduit means connecting the outlet of the pump and. the motor input, second conduit means connecting the motor output and EMI45.5 the input of the pump, said transmission comprising a servomotor actively associated with the pump and with the motor in order to increase the displacement of the motor and to reduce the displacement of the pump for <Desc / Clms Page number 46> EMI46.1 rldu.1.t'u the vi.ta: "sI3 de la trah3 :, iseion. endits means *, ordered ma1 * tl \ 1ollel.: ent comprising valve means manually operated tbr: .. ndnt the servo motor so as to reduce the speed of the trhntll, d 8aion. said preponderant command being sensitive to a LIür, r1tiutT1tion of pl'o.1slon in leadita seconda duct nuclei of the predetermined value due to a rapid displacement of deul1itn .noYC3n13 controlled manually in order to command! 4 the j erv & ** i3ot ur for Change the movement of the pump and the. motor b a degree c: ora..Ar.dé, of such aorta that pressured it in the said second Means :! of conduit does not exceed said predetermined value. EMI46.2 18. A transmission as claimed in claim 17, provided that said pump is a reversible swash plate pump and said motor is a swash plate motor, said engine. EMI46.3 turvo-utour étunt actively connected to the two oscillating plates a to 11 to first increase the displacement of the = tower and then to reduce the displacement of the pump P ') UX',, Ndu: 1ro the speed of the tI "ùtltHniss1otl, ludi te coln1lWnde preponderant comprising a pair of pressure sensitive valve ctoyena, .'un cotn1 \ micant with each of the conduit means connected between the pump and the motor, said means of valve being responsive to the increase in pressure in said second conduit means above said predetermined value due to rapid movement of manual valve deans to control said servo motor so as to reduce the speed of the transmission to a controlled degree, such that the pressure in said second conduit means does not exceed said predetermined value. 19. Hydraulic transmission, characterized in that it comprises a pump, a motor, conduits connecting, respectively, the outlet of the pump to the inlet of the motor and the outlet of the stake to the inlet of the pump. pump in a closed circuit, a Compensation pump intended to supply fluid to the circuit in excess of compensation quantities for the purpose of cooling, a <Desc / Clms Page number 47> EMI47.1 compensation passage making the per4p * 1q Qp.n4 tion communicate with the base duct .., pressure connecting in); 1PO m $ 4 inRsp * and the motor. a corn discharge passage, un1q1,!. at iVQC le c n4u | .t. at low pressure, a discharge valve of fu49 1 éhutr4 4an, the passage of emaciated, and valve means fsnsutnfc norwXf; The compensating passage between the Fqinpong4t # pump and the low pressure duct and closing, normally If passed from the discharge between the low pressure duct and the u4PP 'da 44çliaFt * go, said valve means being movable p4r ç .f.'d) !! from the compensating pump to open, the compensation pal5e and the discharge passage in order to dna # ttrp u Çl '41d of cooled sow in the cQmpeona passage,' 4QJ1 made dNvftCiier 1 fluid heated by the grooming of discharge 10. Transmission follow revenlkc4oi 19, çar4et4- ized in that said pump is reversible, 3.! HhitJ çn4ij.t; rom linking the pump ot the motor in such a way that J.i poslpq can supply fluid to the favorite motor Ù. ±, pull fneoniP q $ from> nj. # Forward or in reverse sema, said pa5e. dt fdWjpflnafifrtpn Cp carrying bypass passages making eoMumtrWsp tA PQmp 4- compensation, respectively, with the pipes roic.n In '! i1' .. the pump and the motor, said passage of t.l6 <: hre comprising passages of derivation communicating the: ) 1'Ie.fl dO ode4rr, * for the fluid heats up, respectively, with back eqi4u citing the pump and the actor between them, mpyele 49 pt? Upapa closing norinalomont each bypass pass of CQIIpenl. '\ Frt.Qn tt the pag-r sage -the derivation of emaciated associates, said moyerto 4f ow |) ap * i being able to be moved by: .0 fluid coming from M pompis 4p coMtn "natio, .l so as to open the passiro of derivation pjswpn fttio *> and the associated cherry bypass passage f41.,!. ço (j. \ l1, tb, 4,8 * 0 pressure connecting between the pump and the motor, in order to 'ttrï'fr of the fluid in the paajcge do 4 Privât, ion, of componsation associated with the conduit n base r-rsltm ot d 'V4t;' \ .. \ ', 1 1,1, \!'. t: ui ... of heated by the due derivation of d'îciiurw * 't iC u c .; .¯ <Desc / Clms Page number 48> low pressure pump, 21. Transmission according to claim 20, characterized in that said motor is reversible, said conduits connecting the pump and the motor in such a way that the pump can supply fluid to either side of the motor in order to to operate the latter in either direction, said transmission comprising a compensation and relief valve in the pass- * EMI48.1 Baglt of compensation between the king ,, no compensation and the bypass passages of compensation, said valve means comprising a reciprocating valve controlling the discharge bypass passages, the spring means normally centering the valve. EMI48.2 reciprocating valve in a manner z accnnnacterise each deco description passage <. 1st read relief valve for heated fluid r4, conduit means exposing the opposite ends of the reciprocating valve to the action of the fluid in the release bypass passages, so that the pressure in the high pressure line connecting the pump and the motor moves the pressure. EMI48.3 popped back and forth in a position connecting the low pressure pipe to the release valve for the heated fluid, separate shut-off valves normally closing, respectively, the compensating bypass passageu, and conduit means sending the fluid under supply from said connecting conduits EMI48.4 the pump and the motor with said l.rrt valves: t, so that the fluid under jJr (ltj1.on coming from the tuttintian high pressure cQudu1t tarnished the shut-off valve 41.wocieo 4 this conduit and the fluid coming from the pump of the corhpnuutiQn opened the other valve shutdown in order to ltd., 4attrate the cooling fluid in the sample at b <4tifjo pressure, while (Iuû lu heated fluid out evacuated from the duct at pressure baaae 22. Hydraulic transmission, o.u.ctërist: 9 in that elected the cOL1prrm'd uno one: H, I and displacement; vl.U'iblfJ, a displacement motor v-ri; .- ble, a second device with piaton and cylinder controlled by fluid for c.f'dl.'fior lo denial due to pump a second dis- <Desc / Clms Page number 49> EMI49.1 piston and cylinder fluid control cylinder for modified engine, a valve light associating it with each device such aorta only when it is completely annealed. EMI49.2 green the piston and the cylinder associated! can move relative EMI49.3 ystnftnt in a sense * tt.lnd.1. that when said light is complete - Moves uncovered The piston and the cylinder can move! * reIntlvument in 10 cona uppoué and when said light is partial ** '.lEJI} f "1t: The piston device 81. cylinder is: siabili. if a swiveling baking plate comprising dou will leave from tioupupe called peripherals associdea, respectively intp auxditott 1ù '"miQreà with valve action each part of the valve that can fit. - j smooth with respect to the associated valve light lora of a plvotera movement of the cume in order to control inJ.ép1nliut1D1.nt the displacement due to 1. potue ot the displacement of the engine, and of the ma * yens to avoid pivoting the edge. 23â Transmission according to claim 22, Ci.i * ac't4 *, ized in cf & that said pump is a swash plate pump tt said itotAui4 uh swash plate motor, said first dijpool- tif 4 piston and cylinder modH'.i .iJ.l.1 ;. lf-slo of the swash plate dtt the pumped, said second diepoAitif h piston and cylinder modifying the angle of the rather obcillutit of the motor, said tr; .. nsm1sa1oll c: n # pt'O "" being means intended and supplying fluid under pressure to ex-: tté ..: it6f} Uppo: 'He ::' of the two devices, one r, z% 5say of drain ,, Ce au * uoeid to the large t) xtI "5mit4 of Ch4 '\ the device turns on the * said the valve operator, said cradle plate cûmciandûnt independent of the anele of the swash plate of the pump and the angle of the swashplate of the motor, said tioyenu intended to make the camera pivot on actuated tioyonu manual praise. 24, The transmission of claim 23 is provided that the valve parts are arranged so as to lluonontor first the displacement of the pump and then z rdu1l "the displacement of the engine to awner the transmission to the desired speed when moving the caine in one direction, and. for aUet1and "", <Desc / Clms Page number 50> EMI50.1 iin1 the displacement of the motor and reduce onuuito Io displacement of the pump to reduce the vitoaao of the rrrr; r: ia.year 1st of the dpl a.:.rr, cla the cam duno the opposite saus * EMI50.2 ± 5, hydraulic differential transmission, book ** EMI50.3 we can say that it consists of an oscillating p.:ca4au pump, an au5 coaxial swash plate touè, an a.nroM6 p7.urxua, rr coaxial iivoè lu; 'ot0! and the r, iot; on a neighbor of the motor # a wbr * of cora * ta4 <irtd <t of the poaipo crossing the t'ompo and the said motor1. bdmmuhd # 4 shaft as uttZW cl, the end adjacent to the pompo for liaiacti with an input power apures and tooxuptrriarWw to Il O: kildi ,, iit4 op!, onea, a central toothed wheel of said ar ^, rrancaa plané * ioitb that is there: set for. turn with ludit. .rxùxex a motor litietiê shaft coaxial with the pump shaft, a crown. itrr.a of said planotary ontrreeage being fixed on the shaft of the nitrogen bic- turn 4 turn with the latter $ of the planetary gears bhi ,, ile.tlà6t with said central denied wheel and with said ciiurdititti rl; rr a planetary pinion support comprising un arire de soi ** iié rins., âiauîor4 coaxial with said eru.t ansa; a planetary, and ded ioydtin to modify a; larr de,% plutozux oseil.Lant8 of the shadow and the engine in order to modify the vlïflaae of the nettle shaft do ith transmission. 26 * Transmission according to claim 25 # earuë ** t4i'1040 in that said auryarrs to codirieatlon are dtbtïhda to tutre vary .rxr:;. O of the swash plate of the pump dahi dei 'series opposed from a neutral central position, in ** trè a minimum displacement position and a displacement position ttt44Yt s, rat3mttr * and to vary the angle of the swash plate of the todtour between a position of maximum displacement and a minimum position, in order to modify the speed of the shaft of Part of the transmission to infinity between the speeds iiiininum H Ïtl: Wâüie, ï 0'l forward and in reverse. 27 <Hydraulic transmission, tulle as described Ci '*