Patent ID: 8593025

Claim:
A driving device for driving a unit ( 11 ), the driving device comprising: a drive shaft ( 16 ), on which at least three rolling bearings ( 19 to 21 ) that drive respective functional elements of the unit are arranged next to one another, characterized in that the at least three rolling bearings ( 19 to 21 ) are unencapsulated needle bearings ( 22 to 24 ) and are arranged directly next to one another on the drive shaft ( 16 ) such that an axial end surface ( 43 , 44 ) of an inner ring ( 25 , 26 ) within the needle bearing ( 22 , 23 ) contacts an axial end surface ( 46 , 47 ) of an outer sleeve ( 32 , 33 ) of an axially adjacent needle bearing ( 23 , 24 ) or there is axial play between the mutually adjacent end surfaces ( 43 , 46 and 44 , 47 ) of the needle bearings ( 23 , 24 ), wherein the inner ring ( 25 to 27 ) of each needle bearing ( 22 to 24 ) has an eccentric inner bore ( 28 to 30 ) by which the inner ring ( 25 to 27 ) is pressed onto the drive shaft ( 16 ), and wherein the eccentric inner bores of the inner rings ( 25 to 27 ) are shifted with respect to a circumferential surface of the inner ring to drive individual tappets.