Poclain Hydraulics Industrie

Jean-Claude Cousin

Louis E Martin

Jean Heren

Bernard R Allart

Philippe Raymond Lucienne

Eric Blondeau

The vehicle has two groups of displacement members (), one of which groups is steerable. The apparatus comprises a closed transmission circuit which includes a pump () and hydraulic motors (). A first group of motors that serves to drive two displacement members on the same axle comprises at least two double motors (), each having two operating cubic capacities forming two elementary motors (). The first elementary motor () of each of the double motors is connected to the pump () in parallel with a motor () of the other group, while the second elementary motor () is connected in series with said motor of the other group. There thus exist first and second series ducts (C, C) between the motors. The series ducts are connected to a low-pressure circuit via means () for limiting the pressure in the series ducts (C, C), and the apparatus further comprises means (R, R, R) for limiting the flow rate of fluid flowing between the series ducts and the low-pressure circuit.

Hydrostatic transmission device of a mobile machine

The apparatus comprises two hydraulic motors to which two displacement members in line are respectively coupled. Each of the motors has three main connections, namely one main connection that is common to both of its cylinder capacities, and two main connections, one for each of its two cylinder capacities. The first main connection of the first motor is connected to the fluid feed and the first main connection of the second motor is connected to the fluid return. The two main connections of the motors are interconnected. A selector having at least two positions is connected to the fluid feed, to the fluid return, and to the third main connection of at least one of the motors. For each of the two selector positions, the total cylinder capacity fed by the pump differs.

Transmission apparatus for a vehicle having at least two drivable displacement members in line

Hydrostatic transmission apparatus for a vehicle having drivable front and rear wheels coupled to front and rear hydraulic motors. A group of motors comprises at least two motors coupled respectively to two wheels situated on either side of the vehicle. The other group of motors comprises at least one motor driving a wheel. The two motors of the first group are dual-capacity motors, each comprising a first elementary motor connected to the pump in parallel with a motor of the second group, and a second elementary motor which is connected in series with said motor of the second group. Two series pipes are thus defined. The apparatus comprises a selection valve connected to the two series pipes and to a port of the pump. This valve can take up a straight-ahead configuration in which the series pipes are isolated from the port of the pump, as well as a left-turn configuration and a right-turn configuration in which the series pipes are connected to said port. The flow sections in at least some of the path branches between the series pipes and said port of the pump are different.

Vehicle transmission apparatus having a valve for controlling cornering behavior

Each drivable axle of the apparatus has two hydraulic motors, one for each side of the vehicle. The apparatus includes two analogous closed transmission circuits, one for each side of the vehicle. The hydraulic motors of the second axle are dual-capacity motors having three main connections. In each closed circuit, the first main connection of the dual-capacity motor and the first main connection of the motor of the first axle are respectively connected continuously to each of the two ports of the pump of the circuit in question, and each circuit further includes a selector having at least two positions and disposed on interconnection ducts between the pump, the second and third main connections of the dual-capacity motor and the second main connection of the motor of the first axle.

Transmission apparatus for a vehicle having at least two drivable axles

Pressurized fluid motor comprising a casing, a cylinder block, a cam, an internal fluid distributor and a selector. The bore of the selector has four grooves. Two of them are communication grooves each connected to a main (feed or exhaust) power duct and to a connection duct, the connection ducts being themselves connected to different groups of distribution ducts. The other two grooves of the bore are branch grooves respectively connected to an additional (feed or exhaust) power duct and to a third connection duct. The slide of the selector comprises at least a first selection groove which is adapted to establish communication between the two branch grooves. By modifying only the shape of the slide, and possibly that of the bore of the additional duct, the selector can provide different functions.

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Pontpoint, France

Jean-Claude Cousin