Pressure-medium actuated shifting arrangement

In a multispeed transmission of a vehicle having in a shifting console a speed-selection lever having a speed-selection lever shaft and displaceable in a double-H pattern by a driver of the vehicle, a transmission shaft shiftable in response to said lever for path selection and gear shifting, respective control valves responsive to displacement of said shaft, transmission-operating cylinders connected with said valves and receiving a pressure medium upon operation of said valves by said transmission shaft, a clutch connected with said transmission, and feedback means for transmitting to said driver through said speed-selection lever a perceptible indication of instantaneous shift position of the transmission and for locking out gear-shifting operation while said clutch remains closed, the improvement wherein;

• said transmission shaft is provided with a plurality of cams rotatable upon rotation of said shaft by said speed-selection lever;
• said control valves include respective pairs of three-port/two-position valves actuated by each of said cams;
• said control three-port/two-position valves are grouped in alignment parallel to an axis of said shaft for selective actuation for path selection and in circumferential alignment for gear shifting;
• said cylinders include a three-position path selection cylinder and a two-position gear-shifting cylinder connected to said control three-port/two position valves;
• a respective safety valve is provided between the three-position path selection cylinder and each said control three-port/two-position valve connected therewith to cooperate with said speed-selection lever shaft, said safety valve being open only in neutral position of said lever;
• and
• a respective further three-port/two position valve is provided between said two-position gear-shifting cylinder and each said control three-port/two position valve being connected therewith, said further three-port/two-position valves being operated by further cams on said speed-selection lever shaft for arresting said two-position shifting cylinder in a median position.