Patent ID: 6199377
Filing Date: 2001-03-13
Classification: B60T,F03C,F16D

Abstract:
A hydraulic motor comprising:a stationary case;a reaction member secured to the case;a cylinder block mounted to rotate about an axis of rotation relative to said reaction member and having a plurality of assemblies each comprising a cylinder and a piston, the assemblies being disposed radially relative to the axis of rotation and being suitable for being fed with fluid under pressure;an internal fluid distributor constrained in rotation relative to the case about the axis of rotation and having distribution ducts suitable for putting the cylinders into communication with fluid feed and exhaust ducts; anda braking device comprising a dog clutch having first and second series of teeth respectively constrained in rotation with the case and with the cylinder block, and a control piston for controlling engagement and disengagement of the teeth of the dog clutch; the motor having at least two distinct operating cylinder capacities and including a cylinder capacity selection slide situated inside the case,wherein an annular space is provided inside the case around the distributor beside the radial face of the cylinder block adjacent to the distributor, wherein the first series of teeth of the dog clutch and its control piston are disposed in said annular space, and wherein the second series of teeth is secured to said radial face of the cylinder block in the vicinity of the radially outer periphery of said radial face, such that the teeth of the dog clutch occupy a region of the motor that is remote from the axis of rotation.