Blocked transmission

An improved, change gear, blocked transmission having a housing, an input shaft driven by a one-way prime mover through a friction master clutch and utilizing relatively nondeformable blockers in connection with jaw clutches, the improvement comprising:

• a mechanical device effective when actuated to decelerate the input shaft and positively reverse rotate the input shaft, said mechanical device comprising a friction coupling rotatable relative to said transmission housing and including a first coupling member drivingly engaged with said input shaft and a second coupling member rotationally fixed to a reaction member, said reaction member being axially and rotationally movable relative to said transmission housing, axial movement of said reaction member toward said first coupling member tending to rotate said reaction member in the direction opposite the direction said input shaft normally drives said first coupling member.

An improved, change gear, blocked transmission having an input shaft driven by a one-way prime mover through a friction master clutch and utilizing relatively nondeformable blockers in connection with jaw clutches, the improvement comprising:

• a mechanical device actuatable only upon disengagement of said master clutch and effective when actuated to decelerate the input shaft and positively reverse rotate the input shaft, said mechanical device including a first gear meshingly engaged with said input shaft and a second gear meshingly engaged with said first gear, said second gear being a gear pump idler gear.

An improved transmission comprising an input shaft driven by a one-way prime mover through a master clutch, input gearing constantly drivingly engaged to said input shaft, an output shaft, selectively engageable jaw clutches to interconnect said input gearing and said output shaft, substantially nondeformable blockers associated with said jaw clutches to prevent engagement thereof if the members of said jaw clutch are not substantially synchronized, the improvement comprising:

• a mechanism actuatable upon disengagement of said master clutch effective to decelerate and positively reverse rotate the input shaft and input gearing, said mechanism comprising a housing fixed to the transmission housing and a friction coupling rotatable in said housing, said coupling comprising a first member rotatably fixed to a gear constantly meshed with the input gearing and a second member rotationally fixed to a reaction member, said reaction member being axially and rotationally movable relative to said housing, axial movement of said reaction member toward said first member tending to rotate said reaction member in the direction opposite the direction said input gearing normally drives said first member.

An improved change gear transmission comprising a housing, an input shaft driven by a one-way prime mover through a master clutch, input gearing constantly drivingly engaged to said input shaft, an output shaft, selectively engageable jaw clutches to rotationally fix one of said input gears to said output shaft, substantially nondeformable blockers associated with said jaw clutches to prevent engagement thereof if the members of said jaw clutch are not substantially synchronized, the improvement comprising:

• a mechanism actuatable upon disengagement of said master clutch effective to decelerate and positively reverse rotate the input shaft and input gearing, said mechanism comprising a friction coupling rotatable relative to said transmission housing, said coupling comprising a first coupling member rotatably fixed to a gear constantly meshed with the input gearing and a second coupling member rotationally fixed to a reaction member, said reaction member being axially and rotationally movable relative to said transmission housing, axial movement of said reaction member toward said first member tending to rotate said reaction member in the direction opposite the direction said input gearing normally drives said first coupling member.