Mechanical steering transmission unit

A mechanical transmission unit, having an input drive shaft (1) and two output driven shafts (6 and 7) that is characterised by the fact that is consists of:

• a couple of bevel gears (2a and 2b):
• the former is splined to the drive shaft (1), whereas the latter is splined to a driven shaft (3) that is at right angle to the drive shaft (1);
• at the ends of the shaft (1) two identical differential units (5) are installed, from which the aforementioned shafts (6 and 7) originate;
• a cogwheel (8) that is splined to the drive shaft (1) and gears with a couple of cogwheels (9 and 10) that are identical to the cogwheel (8), each of which is splined to its driven shaft (11 and 12), which are parallel and whose opposite sides lie near the shaft (1).
• two couples of bevel gears (13a and 13b) and (14a and 14b, which lie near the opposite sides of the aforementioned bevel gears (2a and 2b) and are used to link the differential gears (5) to their driven shafts (11 and 12);
• two identical hydraulic units (15) respectively mounted on the driven shafts (11 and 12), each of them used to start two antithetical clutches (16a and 16b);
• the former (16a) controls transmission of motion from cogwheels (9 and 10) to their respective driven shafts (11 and 12);
• whereas the latter (16b) prevents the free rotation of the frame (17) and driven shafts (11 and 12), making them revolve in the same direction;
• it is also being provided that:
• the three couples of bevel gears (2a and 2b;
• 13a and 13b;
• 14a and 14b) are perfectly identical;
• the bevel gear (2b) is splined to the driven shaft (3) and lies upside down with reference to the two bevel gears (13a and 14b).