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The invention relates to a cutter head for an excavator machine including at least one cutter motor, each cutter motor comprising: a fastener plate; a mounting structure secured to the fastener plate and presenting a central portion and two mounting assemblies disposed on

The invention relates to a cutter head for an excavator machine including at least one cutter motor, each cutter motor comprising: a fastener plate; a mounting structure secured to the fastener plate and presenting a central portion and two mounting assemblies disposed on either side of the fastener plate; two hydraulic motors mounted in said mounting assemblies; a shaft common to both hydraulic motors; a plurality of conduits formed in the thickness of said fastener plate for passing the flow of the liquid used by the hydraulic motors; and a plurality of ducts formed in said central portion of the mounting structure, said ducts being connected to said conduits and to said hydraulic motors to connect each of the two motors to each of said conduits.

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What is claimed is: 1. A cutter head for an excavator machine having at least one cutter motor, each cutter motor comprising: a fastener plate presenting an opening; a mounting structure, distinct from the fastener plate, secured into the opening of the fastener plate, and presenting a central port

What is claimed is: 1. A cutter head for an excavator machine having at least one cutter motor, each cutter motor comprising: a fastener plate presenting an opening; a mounting structure, distinct from the fastener plate, secured into the opening of the fastener plate, and presenting a central portion, and two mounting assemblies disposed on either side of the midplane of the fastener plate; two hydraulic motors, each hydraulic motor being mounted in one of said mounting assemblies and each hydraulic motor having two different cylinder capacities; a common shaft for both hydraulic motors substantially perpendicular to the fastener plate and passing through the central portion; a plurality of conduits formed in the thickness of said fastener plate for conveying a liquid used by the hydraulic motors; a plurality of ducts formed in said central portion of the mounting structure, said ducts being connected firstly to said conduits, and secondly to said hydraulic motors for connecting each of the two hydraulic motors to each of said conduits; and a control system for varying the cylinder capacity of the hydraulic motors, wherein one of said conduits formed in the thickness of said fastener plate is used to control said control system, and wherein said control system is mounted in the central portion of the mounting structure. 2. The cutter head according to claim 1, wherein the two hydraulic motors are substantially identical, and wherein they are substantially symmetrical about the midplane the fastener plate. 3. The cutter head according to claim 1, further comprising two rims for mounting cutter drums, each rim being connected to move with one of the ends of said common shaft, and two sets of bearings mounted on the outside faces of said mounting assemblies to guide said drum-carrying rims, at least in rotation. 4. The cutter head according to claim 1, wherein said ducts formed in the central portion of the mounting structure to feed said hydraulic motors are made in such a manner that the axial thrust produced by the feed liquid against the faces of said motors is substantially balanced. 5. The cutter head according to claim 1, wherein each cutter motor further comprises sealing gaskets and a pressure balancing system for said sealing gaskets, and wherein one of the conduits formed in said fastener plate is a feed conduit for the balancing system. 6. The cutter head according to claim 3, wherein each mounting assembly includes a cylindrical bushing with said bearings being mounted on the outside faces thereof, said cylindrical bushing defining a mounting cavity in which one of the hydraulic motors is mounted. 7. The cutter head according to claim 1, wherein the opening, in which the central portion of said mounting structure is mounted, is circular and is coaxial with the common shaft. 8. A cutter head for an excavator machine having at least one cutter motor, each cutter motor comprising: a fastener plate having a substantially constant thickness; a mounting structure, distinct from the fastener plate, mounted on the fastener plate, and presenting a central portion having a thickness greater than the fastener plate and two mounting assemblies disposed on either side of the midplane of the fastener plate; two hydraulic motors, each hydraulic motor being mounted in one of said mounting assemblies; a common shaft for both hydraulic motors substantially perpendicular to the fastener plate; a plurality of conduits formed in the thickness of said fastener plate for conveying a liquid used by the hydraulic motors; a plurality of ducts formed in said central portion of the mounting structure, said ducts being connected firstly to said conduits, and secondly to said hydraulic motors for connecting each of the two hydraulic motors to each of said conduits; a control system for varying the cylinder capacity of the hydraulic motors, wherein one of said conduits formed in the thickness of said fastener plate is used to control said control system, and wherein said control system is mounted in the central portion of the mounting structure; and wherein said fastener plate includes a circular opening coaxial with the common shaft, wherein the central portion of said mounting structure is mounted in said circular opening, and wherein the common shaft passes through the central portion. 9. The cutter head according to claim 8, wherein the mounting assemblies are constituted by cylindrical bushings defining cylindrical mounting cavities in which the hydraulic motors are mounted. 10. A cutter head for an excavator machine having at least one cutter motor, each cutter motor comprising: a fastener plate: a mounting structure, distinct from the fastener plate, secured to the fastener plate, and presenting a central portion and two mounting assemblies disposed on either side of the midplane of the fastener plate; two hydraulic motors, each hydraulic motor being mounted in one of said mounting assemblies and having a plurality of cylinder capacities; a device that changes the cylinder capacity of the hydraulic motors; a pressure balancing system for sealing gaskets of the cutter motor; a common shaft for both hydraulic motors substantially perpendicular to the fastener plate; a plurality of conduits formed in the thickness of said fastener plate for conveying a liquid used by the hydraulic motors: a plurality of ducts formed in said central portion of the mounting structure, said ducts being connected firstly to said conduits, and secondly to said hydraulic motors for connecting each of the two hydraulic motors to each of said conduits; wherein the conduits formed in the thickness of said fastener plate comprise five feed conduits corresponding respectively to high pressure feed for the hydraulic motors, low pressure oil return from the hydraulic motors, a conduit for draining internal leaks from the hydraulic motors, a feed conduit to control the balancing system, and a conduit to control the device that changes the cylinder capacity of the hydraulic motors.