Patent ID: 6918838

Claim:
A longitudinal plunging unit ( 11 ) for torque transmitting purposes in a shaft assembly, comprising: an outer profiled sleeve ( 21 ) having circumferentially distributed, inner, longitudinally extending first ball grooves ( 22 ), said outer profiled sleeve adapted to be connected to a first attachment part; a profiled journal ( 31 ) positioned inside said outer profiled sleeve ( 21 ) and having circumferentially distributed, outer, longitudinally extending second ball grooves ( 32 ), said profiled journal adapted to be connected to a second attachment part, and wherein said profiled journal ( 31 ) is a hollow journal and with a substantially uniform wall thickness and a maximum deviation in wall thickness of ±15%; groups of balls ( 41 ) arranged in pairs of the first and second ball grooves ( 22 , 32 ); and a sleeve-shaped ball cage ( 42 ) positioned in an annular space between the profiled sleeve ( 21 ) and the profiled journal ( 31 ) and which fixes the groups of balls ( 41 ) in their respective positions relative to one another.