Patent ID: 7516685

Claim:
A PTO transmission structure comprising a PTO driving shaft operatively connected to a driving source, a PTO driven shaft arranged on a downstream side in a transmission direction of said PTO driving shaft, a PTO clutch unit for selectively performing power transmission/power interruption from said PTO driving shaft to said PTO driven shaft, and a transmission case for supporting said PTO driving shaft and said PTO driven shaft and for accommodating said PTO clutch unit, wherein: said transmission case comprises a case main body which includes a first wall having a first hole for supporting said PTO driving shaft, and a second wall having a second hole for supporting said PTO driven shaft, said second wall being spaced apart from said first wall so as to define a first accommodating space to position said PTO clutch unit between said first wall and said second wall; said PTO clutch unit includes a drive-side member which is separate from said PTO driving shaft and which is capable of being operatively connected to said PTO driving shaft in a relatively non-rotatable manner around an axis line, an output shaft member which is separate from said PTO driven shaft and which is capable of being operatively connected to said PTO driven shaft in a relatively non-rotatable manner around an axis line, and a hydraulic clutch mechanism supported by said drive-side member and said output shaft member for selectively performing power transmission/power interruption from said drive-side member to said output shaft member; and each of said PTO driving shaft and said PTO driven shaft is connected to said drive-side member and said output shaft member, respectively, of said PTO clutch unit by inserting said PTO driving shaft through said first hole from the upstream side in the transmission direction of said first wall and inserting said PTO driven shaft through said second hole from the downstream side in the transmission direction of said second wall with said PTO clutch unit positioned in said first accommodating space.