Patent ID: 8172718

Claim:
A planetary gear unit ( 1 ) having two guide discs ( 2 , 3 ) which are arranged parallel to one another and each of the guide discs ( 2 , 3 ) having a perforation ( 7 , 8 ) therein for receiving an end of a pin ( 4 ), each end of the pin ( 4 ) having a journal ( 5 , 6 ) for being received within the perforation ( 7 , 8 ) and a shoulder ( 9 , 10 ) for engaging with one of the guide discs ( 2 , 3 ), with an outer diameter (D 1 ) of the pin ( 4 ) being larger than both an outer diameter (D 3 ) of the journal ( 5 , 6 ) and a diameter (D 2 ) of the perforation ( 7 , 8 ), each of the shoulders ( 9 , 10 ) having circumferential cutting edge ( 11 , 12 ) which is at least hardened, in an area of the cutting edges ( 11 , 12 ), for cutting into a surface of the guide discs ( 2 , 3 ) during a cutting process, and the shoulders ( 9 , 10 ) being supported against a ring ( 18 , 19 ) of displaced material of the guide discs ( 2 , 3 ), generated by the cutting process so that, following the cutting process, both of the guide discs ( 2 , 3 ) engage with the journal ( 5 , 6 ), the shoulder ( 9 , 10 ) and the outer diameter (D 1 ) of the pin ( 4 ) and connect the guide discs ( 2 , 3 ) to the pin ( 4 ).