Patent ID: 7765723

Claim:
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.