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FR2719001A1 - Hydraulic transmission for agricultural tractors - Google Patents

Hydraulic transmission for agricultural tractors Download PDF

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Publication number
FR2719001A1
FR2719001A1 FR9404921A FR9404921A FR2719001A1 FR 2719001 A1 FR2719001 A1 FR 2719001A1 FR 9404921 A FR9404921 A FR 9404921A FR 9404921 A FR9404921 A FR 9404921A FR 2719001 A1 FR2719001 A1 FR 2719001A1
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France
Prior art keywords
motor
motors
double
rear wheels
wheel
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Granted
Application number
FR9404921A
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French (fr)
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FR2719001B1 (en
Inventor
Ballu Jean Louis
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ECB SaRL
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ECB SaRL
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Application filed by ECB SaRL filed Critical ECB SaRL
Priority to FR9404921A priority Critical patent/FR2719001B1/en
Publication of FR2719001A1 publication Critical patent/FR2719001A1/en
Application granted granted Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/34—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles
    • B60K17/356—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having fluid or electric motor, for driving one or more wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location or kind of gearing
    • B60K17/10—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location or kind of gearing of fluid gearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/44—Control of exclusively fluid gearing hydrostatic with more than one pump or motor in operation
    • F16H61/448—Control circuits for tandem pumps or motors

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Arrangement And Driving Of Transmission Devices (AREA)

Abstract

The hydraulic transmission unit is designed to operate with one front wheel, steered and driven and two rear wheels, driven. Each wheel is driven by a motor (2,3,4); the motors (2,3) driving the rear wheels being in the form of double motors (20,21 and 30,31) and supplied in parallel by a single variable flow pump (1). The return feeds from each part of these rear wheel motors are separated.Each half motor (40,41) of the front wheel is supplied in series by the return flow from a half motor (21,31) from one of the rear wheels. An electrically controlled distributor (5) and a combined pressure reducer and limiter (6) act as the desynchronizing unit and are placed in the circuit between the double motor of the front wheel and the half motors of the rear wheels, which supply the double motor.

Description

La présente invention a pour objet un dispositif de transmission hydraulique pour un engin tracteur agricole comportant une roue avant directrice et motrice et au moins deux roues arrière motrices, notamment pour un véhicule du type tracteur-eniambeur.  The present invention relates to a hydraulic transmission device for an agricultural tractor unit comprising a front driving and driving wheel and at least two rear driving wheels, in particular for a vehicle of the tractor-straddle type.

Actuellement tous les tracteurs à transmission hydraulique utilisent une pompe à debit variable alimentant deux ou plusieurs moteurs. Currently all tractors with hydraulic transmission use a variable flow pump supplying two or more motors.

Pour des raisons de sécurité, afin d'éviter 7'emballement d'une roue lestée au détriment des autres, on se trouve dans l'obligation de synchroniser les roues. For safety reasons, in order to avoid the runaway of one weighted wheel to the detriment of the others, we are obliged to synchronize the wheels.

Si la répartition des charges et l'adhérence sont égales sur les trois ou cinq roues la transmission hydraulique s'effectue bien, mais dans le cas inverse, c'est-à-dire dans les côtes, les dévers et les fortes descentes, l'utilisation du tracteur devient dangereuse. If the load distribution and the grip are equal on the three or five wheels the hydraulic transmission works well, but in the opposite case, that is to say in the hills, the superelevations and the strong descents, l use of the tractor becomes dangerous.

On a proposé divers dispositifs de synchronisation, tels que des diviseurs de débit, des distributeurs électroniques, des moteurs à engrenage, mais aucun d'entre eux n'est pleinement efficace. En effet r
- les diviseurs de débit présentent deux inconvénients, le laminage de l'huile qui entraîne une surchauffe, et une efficacite liee à un débit et une pression fixes.Various timing devices have been proposed, such as flow dividers, electronic distributors, gear motors, but none of them is fully effective. Indeed
- the flow dividers have two drawbacks, the rolling of the oil which leads to overheating, and an efficiency linked to a fixed flow and pressure.

- les distributeurs électroniques, qui comportent des tiroirs que l'an ferme plus ou moins dans le cas de l'emballement d'une roue, présentent I 'inconvénient de réagir après 1'incident. - Electronic distributors, which have drawers that the year more or less closes in the case of a runaway wheel, have the disadvantage of reacting after the incident.

- dans les moteurs à engrenage la synchronisation est obtenue par la mise en place, entre l'entrée de chaque moteur et la pompe, d'un ensemble de moteurs à engrenage reliés entre eux afin d'obtenir une synchronisation volumétrique, mais le rapport des moteurs n'est pas suffisamment précis. - In gear motors, synchronization is obtained by the installation, between the input of each motor and the pump, of a set of gear motors linked together in order to obtain volumetric synchronization, but the ratio of engines is not precise enough.

La presente invention vise à remédier à cette carence des dispositifs connus en proposant un dispositif de transmission hydraulique qui permet une synchronisation permanente des roues c'un tracteur comportant une roue avant directrice et motrice et au moins deux roues arrière motrices. The present invention aims to remedy this deficiency of known devices by proposing a hydraulic transmission device which allows permanent synchronization of the wheels of a tractor comprising a front driving and driving wheel and at least two rear driving wheels.

Le dispositif de transmission hydraulique objet de la présente invention se caractérise essentiellement d'une part en ce que chaque roue est entraînée par un moteur double, les moteurs des roues arrière étant alimentés en parallèle par une seule pompe à debit variable, les retours desdites roues arrière étant separés, et d'autre part en ce que chaque demi-moteur de la roue avant est alimenté en série par un demi-moteur d'une des roues arrière. The hydraulic transmission device which is the subject of the present invention is essentially characterized on the one hand in that each wheel is driven by a double motor, the motors of the rear wheels being supplied in parallel by a single variable flow pump, the returns of said wheels rear being separated, and secondly in that each half-motor of the front wheel is supplied in series by a half-motor of one of the rear wheels.

Selon une caractéristique additionnelle de l'invention un bloc de désynchronisation, comprenant un électro-distributeur et un réducteur de pression doublé d'un limiteur de pression, est placé sur le circuit entre le moteur double de la roue avant et les demi-moteurs des roues arrière qui l'alimentent. According to an additional characteristic of the invention, a desynchronization block, comprising an electro-distributor and a pressure reducer doubled with a pressure limiter, is placed on the circuit between the double motor of the front wheel and the half-motors of the rear wheels that power it.

Conformement à l'invention un autre électrodistributeur placé sur le retour des demi-moteurs arrière n'alimentant pas les demi-moteurs avant permet, selon sa position, soit un retour direct à la pompe soit un retour en circuit fermé aux moteurs arrière. In accordance with the invention, another solenoid valve placed on the return of the rear half-motors not supplying the front half-motors allows, depending on its position, either a direct return to the pump or a return to the rear motors in a closed circuit.

Le synchronisme des roues est obtenu par l'alimentation en série par moitié de la roue avant en passant par les roues arrière, permettant en outre un couple maximum du fait de l'alimentation en parallèle des roues arrière. The synchronism of the wheels is obtained by the serial supply by half of the front wheel passing through the rear wheels, further allowing maximum torque due to the parallel supply of the rear wheels.

Dans les virages la ou les roues extérieures tournant plus vite que la ou les roues interieures, il est nécessaire de libérer le synchronisme, et à cet effet l'électro-distributeur est ouvert afin d'introduire en marche avant un complément d'huile entre les roues arrière et la roue avant grâce au réducteur, et de permettre l'évacuation de l'excédent d'huile en marche arrière grace au limiteur. When cornering the outer wheel (s) rotating faster than the inner wheel (s), it is necessary to release the synchronism, and for this purpose the solenoid valve is open in order to introduce a forward oil supplement between the rear wheels and the front wheel thanks to the reducer, and to allow the evacuation of excess oil in reverse thanks to the limiter.

Il convient de remarquer qu'afin d'obtenir un avancement identique de toutes les roues, il est nécessaire d'utiliser des moteurs à piston en raison de leurs très faibles fuites.  It should be noted that in order to obtain identical advancement of all the wheels, it is necessary to use piston engines because of their very low leaks.

Les avantages et- les caractéristiques de la présente invention ressortiront plus clairement de la description qui suit et qui se rapporte au dessin annexé, lequel en représente un mode de réalisation non limitatif. The advantages and the characteristics of the present invention will emerge more clearly from the description which follows and which refers to the appended drawing, which represents a non-limiting embodiment thereof.

Dans le dessin annexé
- la figure 1 représente le schéma de distribution hydraulique d'un engin tracteur à trois roues selon l'invention. In the attached drawing
- Figure 1 shows the hydraulic distribution diagram of a three-wheeled tractor according to the invention.

- la figure 2 représente le schéma de distribution hydraulique d'un engin tracteur à cinq roues selon l'invention. - Figure 2 shows the hydraulic distribution diagram of a five-wheeled tractor according to the invention.

Si on se réfère à la figure 1 on peut voir qu'un circuit hydraulique d'un engin tracteur à trois roues selon la présente invention comporte une pompe hydraulique à debit variable 1 alimentant en parallèle deux moteurs doubles 2 et 3 actionnant chacun une roue arrière, et composés chacun de deux demi-moteurs respectivement 20 et 21, et 30 et 31. Referring to FIG. 1, it can be seen that a hydraulic circuit of a three-wheeled tractor according to the present invention comprises a hydraulic pump with variable flow 1 supplying in parallel two double motors 2 and 3 each actuating a rear wheel , and each composed of two half-motors respectively 20 and 21, and 30 and 31.

Le circuit hydraulique comporte également un moteur double 4 entraînant la roue avant, composé de deux demi-moteurs 40 et 41 alimentes en série, pour une moitié par le moteur 2 et pour l'autre moitié par le moteur 3. The hydraulic circuit also includes a double motor 4 driving the front wheel, composed of two half-motors 40 and 41 supplied in series, half by motor 2 and the other half by motor 3.

Les alimentations des moteurs 20 et 21, respectivement 30 et 31, des roues arrière sont groupées, et les sorties sont separées, c'est-à-dire que les moteurs 21 et 31 alimentent chacun un des demi-moteurs avant, respectivement 40 et 41, et l'huile sortant des moteurs 20 et 30 retourne, selon la position d'un électro-distributeur 9, soit à la pompe 1, soit au moteur double 2, en circuit fermé. The power supplies of motors 20 and 21, respectively 30 and 31, of the rear wheels are grouped, and the outputs are separated, that is to say that the motors 21 and 31 each supply one of the front half-motors, respectively 40 and 41, and the oil leaving the motors 20 and 30 returns, depending on the position of a solenoid valve 9, either to the pump 1, or to the double motor 2, in a closed circuit.

Afin de libérer le synchronisme des roues, notamment pour effectuer un virage, un bloc de désynchronisation, composé d'un électro-distributeur 5 et d'un reducteur et limiteur de pression 6, est placé sur le circuit entre les demi-moteurs 21 et 31 et le moteur double 4. In order to release the synchronism of the wheels, in particular for making a turn, a desynchronization block, composed of an electro-distributor 5 and a reducer and pressure limiter 6, is placed on the circuit between the half-motors 21 and 31 and the double motor 4.

Lors du passage dans un virage, l'electro- distributeur 5 est ouvert, en marche avant le réducteur permet d'apporter un complément d'huile dans les demi moteurs de la roue extérieure, tandis qu'en marche arrière le limiteur permet d'évacuer les excédents huile.  When passing through a bend, the solenoid valve 5 is open, in forward gear the reducer makes it possible to add additional oil to the half-motors of the outer wheel, while in reverse the limiter makes it possible to drain the excess oil.

Si on se repère maintenant à la figure 2 on peut voir que le circuit hydraulique d'un engin tracteur à cinq roues selon l'invention comporte deux roues de chaque coté, entraînées chacune par un moteur double, 2 et 7, et 3 et 8, et une roue avant entraînée par un moteur double 4. If we now refer to Figure 2 we can see that the hydraulic circuit of a five-wheeled tractor according to the invention has two wheels on each side, each driven by a double motor, 2 and 7, and 3 and 8 , and a front wheel driven by a double motor 4.

Sur chaque côté du tracteur, le moteur double 7, 8, et un demi-moteur 21, 31 du moteur double 2, 3, sont alimentés en parallèle par la pompe 1, tandis que l'autre demi-moteur 20, 30, du moteur double 2, 3, est alimenté en série par le demi-moteur 70, 80, le demi-moteur 21, 31 alimentant en serie le demi-moteur 40, 41 du moteur double 4 de la roue avant. On each side of the tractor, the double motor 7, 8, and a half motor 21, 31 of the double motor 2, 3, are supplied in parallel by the pump 1, while the other half motor 20, 30, of the double motor 2, 3, is supplied in series by the half-motor 70, 80, the half-motor 21, 31 supplying in series the half-motor 40, 41 of the double motor 4 of the front wheel.

Comme dans le circuit décrit à l'appui de la figure 1, deux électro-distributeurs 9 et 9' sont placés respectivement en sortie des demi-moteurs arrière respectivement 20 et 30, avec possibilité soit de retour direct à la pompe 1, soit de retour en circuit fermé aux demi-moteurs, respectivement 71, 21, 70, et 81, 80, 31. As in the circuit described in support of FIG. 1, two solenoid valves 9 and 9 ′ are placed respectively at the output of the rear half-motors respectively 20 and 30, with the possibility of either direct return to the pump 1, or of return to closed circuit with half-motors, respectively 71, 21, 70, and 81, 80, 31.

Egalement comme dans lé circuit représenté en figure 1, un bloc de désynchronisation, composé d'un électro-distributeur 5 et d'un réducteur et limiteur de pression 6, est placé sur le circuit entre les demi-moteurs 21 et 31 et le moteur double 4.  Also as in the circuit shown in FIG. 1, a desynchronization block, composed of an electro-distributor 5 and of a pressure reducer and limiter 6, is placed on the circuit between the half-motors 21 and 31 and the motor double 4.

Claims (3)

REUENDICATIONS 1) Dispositif de transmission hydraulique pour un engin tracteur agricole comportant une roue avant directrice et motrice et au moins deux roues arrière motrices, caractérisé en ce que d 'une part chaque roue est entraînée par un moteur double (2, 3, 4, 7, 8), tous les moteurs (2, 3, 7, 8) des roues arrière étant alimentés en parallèle par une seule pompe à débit variable (1), les retours desdites roues arriere étant séparés ; en ce que chaque demi-moteur (40, 41) de la roue avant est alimenté en série par un demimoteur (21, 31) d'une des roues arrière ; et en ce qutun bloc de désynchronisation, comprenant un électrodistributeur (5) et un réducteur de pression doublé d'un limiteur de pression (6), est place sur le circuit entre le moteur double (4) de la roue avant et lesdits demi-moteurs (21, 31) des roues arrière qui l'alimentent. REUENDICATIONS 1) Hydraulic transmission device for an agricultural tractor comprising a front driving and driving wheel and at least two rear driving wheels, characterized in that on the one hand each wheel is driven by a double motor (2, 3, 4, 7, 8), all the motors (2, 3, 7, 8) of the rear wheels being supplied in parallel by a single variable flow pump (1), the returns of said rear wheels being separated; in that each half-motor (40, 41) of the front wheel is supplied in series by a half-motor (21, 31) of one of the rear wheels; and in that a desynchronization block, comprising a solenoid valve (5) and a pressure reducer doubled with a pressure limiter (6), is placed on the circuit between the double motor (4) of the front wheel and said half motors (21, 31) of the rear wheels which power it. 2) Dispositif selon la revendication 1 caractérise en ce qu'un électro-distributeur (9, 9') est placé sur le retour des demi-moteurs (20, 30) arrière qui n'alimentent pas les demi-moteurs avant (40, 41), permettant, selon sa position, soit un retour direct à la pompe (1) soit un retour en circuit ferme aux moteurs doubles (2, 3, 7, 8) des roues arrière.2) Device according to claim 1 characterized in that a solenoid valve (9, 9 ') is placed on the return of the rear half-motors (20, 30) which do not supply the front half-motors (40, 41), allowing, depending on its position, either a direct return to the pump (1) or a return in closed circuit to the double motors (2, 3, 7, 8) of the rear wheels. 3) Dispositif selon la revendication 1 ou la revendication 2 caractérisé en ce que pour un tracteur à cinq roues, sur chaque côté, un moteur double arrière (7, 8) et le demimoteur arrière (31, 21) qui alimente le demi-moteur avant (40, 41), sont alimentés en parallèle par la pompe (i), et 'un (70, 80) des demi-moteurs dudit moteur-double (7, 8) alimente en série le demi-moteur (20, 30) du moteur-double arrière (2, 3t qui n'alimente pas le demi-moteur avant (40, 41). 3) Device according to claim 1 or claim 2 characterized in that for a five-wheeled tractor, on each side, a double rear motor (7, 8) and the rear half-engine (31, 21) which supplies the half-engine front (40, 41), are supplied in parallel by the pump (i), and 'one (70, 80) of the half-motors of said double motor (7, 8) supplies in series the half-motor (20, 30 ) of the rear double motor (2, 3t which does not supply the front half-motor (40, 41).
FR9404921A 1994-04-20 1994-04-20 Hydraulic transmission device for an agricultural tractor comprising a front driving and driving wheel and at least two rear driving wheels. Expired - Lifetime FR2719001B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9404921A FR2719001B1 (en) 1994-04-20 1994-04-20 Hydraulic transmission device for an agricultural tractor comprising a front driving and driving wheel and at least two rear driving wheels.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9404921A FR2719001B1 (en) 1994-04-20 1994-04-20 Hydraulic transmission device for an agricultural tractor comprising a front driving and driving wheel and at least two rear driving wheels.

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FR2719001A1 true FR2719001A1 (en) 1995-10-27
FR2719001B1 FR2719001B1 (en) 1996-07-26

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FR9404921A Expired - Lifetime FR2719001B1 (en) 1994-04-20 1994-04-20 Hydraulic transmission device for an agricultural tractor comprising a front driving and driving wheel and at least two rear driving wheels.

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0816153A3 (en) * 1996-06-28 1999-05-19 Moffett Research and Development Limited A hydraulic drive system
EP0919417A1 (en) 1997-11-26 1999-06-02 Moffett Research and Development Limited An hydraulic drive system and controller
WO2000006408A1 (en) * 1998-07-28 2000-02-10 Brueninghaus Hydromatik Gmbh Hydrostatic drive with differential lock
EP1004469A2 (en) 1998-11-26 2000-05-31 Moffett Research and Development Limited An hydraulic drive system
EP1010566A1 (en) 1998-12-16 2000-06-21 Poclain Hydraulics Industrie Transmission device for a mobile machine with turning behaviour control valve
EP1026024A1 (en) * 1999-02-05 2000-08-09 Poclain Hydraulics Industrie Transmission for a mobile machine with at least two drive axles
EP1026025A1 (en) * 1999-02-05 2000-08-09 Poclain Hydraulics Industrie Transmission device for mobile engine with at least two serially arranged displacement motors
FR2828544A1 (en) 2001-08-09 2003-02-14 Poclain Hydraulics Ind Hydrostatic transmission equipment for vehicle, e.g. wine growing tractor, with two pairs of motorized wheels one pair being steerable, comprises series channels which have means of limiting pressure and fluid flow
DE112007002436T5 (en) 2006-10-18 2009-08-27 Poclain Hydraulics Industrie Hydrostatic transmission device of a machine
EP2378166A3 (en) * 2010-04-16 2012-10-03 Robert Bosch GmbH Hydrostatic traction drive
FR2985786A1 (en) * 2012-01-18 2013-07-19 Poclain Hydraulics Ind HYDRAULIC TRANSMISSION CIRCUIT WITH MULTIPLE CYLINDER
EP2765309A1 (en) * 2013-02-12 2014-08-13 Poclain Hydraulics Industrie Improved double hydraulic machine comprising a distribution valve, and a drive system incorporating such a hydraulic machine

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US3250340A (en) * 1962-09-27 1966-05-10 Robert E Roberson Hydrostatic driving system for motor vehicle
DE2737319A1 (en) * 1976-08-18 1978-02-23 Patricia Mary Bushell VEHICLE WITH ALL-WHEEL DRIVE
WO1989012558A1 (en) * 1988-06-18 1989-12-28 Goldhofer Fahrzeugwerk Gmbh & Co. Process for regulating the speed of one or several sets of driving wheels of a vehicle with hydrostatic drive; device for executing said process
EP0547947A1 (en) * 1991-12-19 1993-06-23 POCLAIN HYDRAULICS, Société Anonyme Mobile engine with front and rear hydraulic drive motors

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3250340A (en) * 1962-09-27 1966-05-10 Robert E Roberson Hydrostatic driving system for motor vehicle
DE2737319A1 (en) * 1976-08-18 1978-02-23 Patricia Mary Bushell VEHICLE WITH ALL-WHEEL DRIVE
WO1989012558A1 (en) * 1988-06-18 1989-12-28 Goldhofer Fahrzeugwerk Gmbh & Co. Process for regulating the speed of one or several sets of driving wheels of a vehicle with hydrostatic drive; device for executing said process
EP0547947A1 (en) * 1991-12-19 1993-06-23 POCLAIN HYDRAULICS, Société Anonyme Mobile engine with front and rear hydraulic drive motors

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0816153A3 (en) * 1996-06-28 1999-05-19 Moffett Research and Development Limited A hydraulic drive system
EP0919417A1 (en) 1997-11-26 1999-06-02 Moffett Research and Development Limited An hydraulic drive system and controller
US6382340B1 (en) 1997-11-26 2002-05-07 Moffett Research And Development Limited Hydraulic drive system and controller
WO2000006408A1 (en) * 1998-07-28 2000-02-10 Brueninghaus Hydromatik Gmbh Hydrostatic drive with differential lock
US6276468B1 (en) 1998-07-28 2001-08-21 Brueninghaus Hydromatik Gmbh Hydrostatic vehicle drive with differential lock
EP1004469A3 (en) * 1998-11-26 2001-05-30 Moffett Research and Development Limited An hydraulic drive system
EP1004469A2 (en) 1998-11-26 2000-05-31 Moffett Research and Development Limited An hydraulic drive system
US6488111B1 (en) 1998-11-26 2002-12-03 Moffett Research And Development Limited Hydraulic drive system
EP1010566A1 (en) 1998-12-16 2000-06-21 Poclain Hydraulics Industrie Transmission device for a mobile machine with turning behaviour control valve
FR2787396A1 (en) 1998-12-16 2000-06-23 Poclain Hydraulics Ind TRANSMISSION DEVICE FOR A MOBILE MACHINE WITH TURNING BEHAVIOR CONTROL VALVE
US6354392B1 (en) 1998-12-16 2002-03-12 Poclain Hydraulics Industrie Vehicle transmission apparatus having a valve for controlling cornering behavior
FR2789352A1 (en) * 1999-02-05 2000-08-11 Poclain Hydraulics Ind DEVICE FOR TRANSMITTING A MOBILE MACHINE HAVING AT LEAST TWO IN-LINE MOTOR MOVING DEVICES
FR2789351A1 (en) * 1999-02-05 2000-08-11 Poclain Hydraulics Ind TRANSMISSION DEVICE OF A MOBILE MACHINE HAVING AT LEAST TWO MOTOR BRIDGES
EP1026025A1 (en) * 1999-02-05 2000-08-09 Poclain Hydraulics Industrie Transmission device for mobile engine with at least two serially arranged displacement motors
US6386307B1 (en) 1999-02-05 2002-05-14 Poclain Hydraulics Industrie Transmission apparatus for a vehicle having at least two drivable displacement members in line
EP1026024A1 (en) * 1999-02-05 2000-08-09 Poclain Hydraulics Industrie Transmission for a mobile machine with at least two drive axles
US6230829B1 (en) 1999-02-05 2001-05-15 Poclain Hydraulics Industrie Transmission apparatus for a vehicle having at least two drivable axles
FR2828544A1 (en) 2001-08-09 2003-02-14 Poclain Hydraulics Ind Hydrostatic transmission equipment for vehicle, e.g. wine growing tractor, with two pairs of motorized wheels one pair being steerable, comprises series channels which have means of limiting pressure and fluid flow
WO2003013896A1 (en) 2001-08-09 2003-02-20 Poclain Hydraulics Industrie Hydrostatic transmission device of a mobile machine
US6991058B2 (en) 2001-08-09 2006-01-31 Poclain Hydraulics Industrie Hydrostatic transmission device of a mobile machine
US8627657B2 (en) 2006-10-18 2014-01-14 Poclain Hydraulics Industrie Vehicle hydrostatic transmission device
DE112007002436T5 (en) 2006-10-18 2009-08-27 Poclain Hydraulics Industrie Hydrostatic transmission device of a machine
DE112007002436B4 (en) 2006-10-18 2017-11-30 Poclain Hydraulics Industrie Hydrostatic transmission device of a machine
EP2378166A3 (en) * 2010-04-16 2012-10-03 Robert Bosch GmbH Hydrostatic traction drive
FR2985786A1 (en) * 2012-01-18 2013-07-19 Poclain Hydraulics Ind HYDRAULIC TRANSMISSION CIRCUIT WITH MULTIPLE CYLINDER
US9512859B2 (en) 2012-01-18 2016-12-06 Poclain Hydraulics Industrie Hydraulic transmission circuit with multiple capacities
EP2617985A1 (en) * 2012-01-18 2013-07-24 Poclain Hydraulics Industrie Hydraulic transmission system with multiple cylinders
EP2765309A1 (en) * 2013-02-12 2014-08-13 Poclain Hydraulics Industrie Improved double hydraulic machine comprising a distribution valve, and a drive system incorporating such a hydraulic machine
CN103982484A (en) * 2013-02-12 2014-08-13 波克兰液压工业设备公司 Improved double hydraulic machine with a distribution valve and a driving system comprising such a hydraulic machine
FR3002006A1 (en) * 2013-02-12 2014-08-15 Poclain Hydraulics Ind IMPROVED DOUBLE HYDRAULIC MACHINE WITH DISTRIBUTION VALVE, AND DRIVE SYSTEM COMPRISING SUCH A HYDRAULIC MACHINE
US9404485B2 (en) 2013-02-12 2016-08-02 Poclain Hydraulics Industrie Double hydraulic machine with a distribution valve and a driving system comprising such a hydraulic machine
CN103982484B (en) * 2013-02-12 2017-03-01 波克兰液压工业设备公司 The improved dual hydraulic machine with distributing valve and the drive system including this hydraulic press

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FR2719001B1 (en) 1996-07-26

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