Patent ID: 7914010
Filing Date: 2011-03-29
Classification: B23B,Y10T

Abstract:
1. A hydraulic expansion chuck for a chucking a tool such as a boring tool, a milling cutter, or other cutting tool, said hydraulic expansion chuck comprising: a central longitudinal axis about which said chuck is to be rotated; a tool-side end at which a tool is held; a machine-side end at which said expansion chuck is to be connected to a machine for imparting rotational force to said expansion chuck to rotate said expansion chuck; said machine-side end being disposed opposite said tool-side end; a base body being disposed concentrically with respect to said central longitudinal axis; said base body comprising: said shank-holding portion comprising an expansion bushing being configured to receive and hold a shank of a tool therein; a pressure chamber being configured and disposed to surround said expansion bushing; said pressure chamber being configured and disposed to hold a pressure fluid therein; said pressure chamber being configured and disposed to be pressurized to radially deform said expansion bushing to clamp and hold a shank of a tool disposed therein to chuck the tool; a pressure generating unit being disposed a distance axially away from said central longitudinal axis; an annular gap being disposed concentrically with respect to said central longitudinal axis; said annular gap being configured and disposed to connect said pressure generating unit and said pressure chamber to permit the transmission of pressure from said pressure generating unit to said pressure chamber; said expansion chuck comprises a chucking sleeve disposed concentrically about said shank-holding portion of said base body; and said base body and said chucking sleeve together form said annular gap and said pressure chamber.