Parking mechanism for transmissions

A parking mechanism for a transmission, comprising:

• an input shaft having a plurality of drive gears;
• an output shaft located in parallel with said input shaft, and having a plurality of driven gears constantly meshed with corresponding gears of said drive gears;
• a plurality of dog clutches selectively coupled between one of said drive gears and said input shaft or between one of said driven gears and said output shaft;
• a plurality of parallel shifter rails disposed in parallel with said input shaft, each of said shifter rails including a shifter fork fixed thereon for axial movement with said shifter rail into engagement with one of said dog clutches, each of said shifter rails also having a single shifter arm mounted thereon, each of said shifter arms having a groove therein;
• a select and shifter shaft disposed in parallel with said shifter rails, and an annular member fixed to said select and shifter shaft for movement therewith, said annular member having a plurality of coupling members, said coupling members being engaged in said grooves, by rotation of said select and shifter shaft, for axial movement of one of said shifter rails, and
• a parking coupling member for the parking position provided on the annular portion of said select and shifter shaft for engagement within the grooves of at least two of said shifter arms, by rotation of said select and shifter shaft, for axial movement of two shifter rails whereby the shifter fork on one of said two shifter rails is brought into operative engagement with a first of said dog clutches and the shift fork on the other of said two shifter rails is brought into operative engagement with a second of said dog clutches thereby establishing a parking position independent of other shift positions.