Multi speed transmission device with hydraulically actuated shift rods

A multi-speed transmission, comprising:

• a plurality of hydraulically actuated shift rods (7 to 11);
• a plurality of piston units (2 to 6) with a plurality of piston chambers (2A to 6B), the plurality of piston units (2 to 6) configured for adjusting the plurality of hydraulically actuated shift rods (7 to 11) to change a transmission ratio of the multi-speed transmission;
• a valve device (15);
• a plurality of shuttle valves (2C to 6D), each of the shuttle valves (2C to 6D) having a spring assembly (2E to 6F);
• and
• a plurality of valves (16, 17),
• wherein an actuating pressure (p_B) is applicable by the valve device (15) and the shuttle valves (2C to 6D) to the piston chambers (2A to 6B) of the piston units (2 to 6), the actuating pressure being freely adjustable by the valves (16, 17), the piston chambers (2A to 6B) of the piston units (2 to 6) configured to be brought into operative connection with a low-pressure region (52) either by the shuttle valves (2C to 6D) and a prefilling valve (32, 33) or by the shuttle valves (2C to 6D), the valve device (15) and the valves (16, 17), and
• wherein the spring assemblies (2E to 6F) of the shuttle valves (2C to 6D) hold the shuttle valves (2C to 6D) in an operating state that connects the piston chambers (2A to 6B) to the low-pressure region (52) by the prefilling valve (32, 33) when the actuating pressure (p_B) is less than a pressure threshold of the actuating pressure (p_B).