PINION FORMED BY TWO JOINABLE PARTS
Pinion formed by two joinable parts mountable on a shaft includes a substantially semi-circular first portion of the pinion; a substantially semi-circular second portion of the pinion; the first portion has a first joining surface and a first portion of a hole concentric with the pinion; the second portion has a second joining surface and a second portion of a hole concentric with the pinion; the first joining surface is adapted to be joined to the second joining surface by means of connection means; characterized in that the connection means includes a first bushing and a second bushing; the first bushing is fixed onto said first portion and protrudes from the first joining surface; said second bushing is fixed onto the first or second portion and protrudes from the first or second joining surface.
1 . A pinion formed by two joinable parts which is mountable on a shaft comprising: a substantially semi-circular first portion ( 12 ) of said pinion ( 10 ); a substantially semi-circular second portion ( 11 ) of said pinion; said first portion ( 12 ) has a first joining surface ( 16 ) and a first portion ( 14 ) of a hole concentric with said pinion ( 10 ); said second portion ( 11 ) has a second joining surface ( 16 ) and a second portion ( 14 ) of a hole concentric with said pinion ( 10 ); said first joining surface ( 16 ) is suited to be joined to said second joining surface ( 16 ) by means of connection means; characterized in that said connection means comprise a first bushing ( 20 ) and a second bushing ( 20 ); said first bushing ( 20 ) is fixed onto said first portion ( 12 ) and protrudes from said first joining surface ( 16 ); said second bushing ( 20 ) is fixed onto said first ( 12 ) or second ( 11 ) portion and protrudes from said first or second joining surface ( 16 ).
2 . The pinion according to claim 1 characterized in that said first portion ( 12 ) and said second portion ( 11 ) is half pinion and said first and second concentric hole portion is half hole ( 14 ).
3 . The pinion according to claim 1 , characterized in that said first bushing ( 20 ) and said second bushing ( 20 ) are partially covered by an external thread ( 21 ).
4 . The pinion according to claim 1 , characterized in that said first bushing ( 20 ) and said second bushing ( 20 ) are partially smooth on the outer portion ( 22 ).
5 . The pinion according to claim 1 , characterized in that said first bushing ( 20 ) is screwed into said first portion ( 12 ) and said second bushing ( 20 ) is screwed into said first ( 12 ) or second ( 11 ) portion.
6 . The pinion according to claim 1 , characterized in that said first bushing ( 20 ) and said second bushing ( 20 ) are hollow and internally threaded.
7 . The pinion according to claim 1 , characterized in that said first and said second bushing ( 20 ) are substantially cylindrical and comprise a flat crested thread ( 21 ) on the outside.
8 . The pinion according to claim 1 , characterized in that said first bushing ( 20 ) is fixed onto said first portion ( 12 ); said second bushing ( 20 ) is fixed onto said first portion ( 12 ); a first hole ( 15 ) is arranged on said second portion ( 11 ) and is aligned with said first bushing ( 20 ); a second hole ( 15 ) is arranged on said second portion ( 11 ) and is aligned with said second bushing ( 20 ).
9 . The pinion according to claim 1 , characterized in that said first bushing ( 20 ) and said second bushing ( 20 ) are arranged at the sides of said first concentric hole portion ( 14 ).
10 . The pinion according to claim 1 , characterized in that said first bushing ( 20 ) is fixed onto said first portion ( 12 ) at a distance from said first concentric hole portion ( 14 ) different from the distance between said second bushing ( 20 ) and said first concentric hole portion ( 14 ).
11 . The pinion according to claim 1 , characterized in that the thread ( 21 ) of said first bushing ( 20 ) and of said second bushing ( 20 ) has a step that has a ratio with the width at the base of the thread comprised between 3 to 1 and 4 to 1.