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US 4,658,662 AGranted
Transmission and PTO system for tractors and utility cycles
OwnerKenneth P. Rundleinventor
Life of this patent
Estimating the term…
Abstract
A speed change transmission is shown in variation having an extremely wide range of selectively engageable speed drive ratios for use with garden tractors and utility cycles with tractor mode. The transmission also serves as a speed range transmission for use with a hydrostatic transmission in a garden tractor. In variation the transmission is shown with a new two speed PTO systme featuring selectively engageable rear, middle and front outputs. The transmissions and PTO system are extremely compact by virtue of an unique creep speed reduction train, a simplified constant mesh shift means, a PTO shaft journalled coaxially within a hollow transmission mainshaft and a minimum number of components arranged and adapted so that many serve multiple functions.
Claims10
A tractor power transmission comprised of;
- a speed transmission housing, a first transmission shaft (40A)journalled in said housing, a hollow second transmission shaft (10A)journalled in said housing generally below and parallel to said first transmission shaft, a PTO drive shaft (71) journalled in said housing and passing axially within said second transmission shaft and protruding forward and rearward from said second transmission shaft, a third transmission shaft (11A)journalled in said housing parallel to said second transmission shaft, a final drive differential journalled in said housing perpendicular to said third transmission shaft, a coaxial rearward extension shaft (72) to said PTO drive shaft journalled in said housing to provide a rear PTO drive, gear means to drivingly connect said second and said third transmission shafts, gear means to drivingly connect said third transmission shaft and said final drive differential, a first set of intermeshing gears on said first and said second transmission shafts to drivingly connect said first and said second transmission shafts, a second set of intermeshing gears on said first transmission shaft and said PTO drive shaft PTO clutch means shiftable to drivingly connect said first transmission shaft and said PTO drive shaft through said second set of intermeshing gears at a first speed ratio when said PTO clutch means are in a first actuated state, said PTO clutch means shiftable to drivingly connect said first transmission shaft and said PTO drive shaft through said first set of intermeshing gears at a second speed ratio when said PTO clutch means are in a second actuated state and while said first set of intermeshing gears continues to provide a line of drive from said first transmission shaft to said second transmission shaft.
A power transmission comprising;
- a transmission support and enclosure housing, an input mainshaft (10B) journalled in said housing, an output countershaft (11B) journalled in said housing parallel to said mainshaft, a first meshing gearset on said shafts comprised of a first pinion (31) nonrotatable on said mainshaft and a first gear (32) rotatable on said countershaft, a second meshing gearset on said shafts comprised of a second pinion (33) rotatable on said countershaft and a second gear (34) rotatable on said mainshaft, a third meshing gearset on said shafts comprised of a third gear(36)nonrotatable on said countershaft and a third pinion (35) rotatable on said mainshaft, said third pinion forming a cluster gear with said second gear, said second meshing gearset being disposed between said first and said third gearsets, first clutch means shiftable to selectively drivingly connect said first gear to said second pinion and to said countershaft one at a time to establish a first and a second speed drive at respective reduction ratio between said shafts, said first speed drive having said reduction ratio equal to the multiplicative product of said first, said second and said third meshing gearset ratios, said second speed drive having said reduction ratio equal to said first gearset ratio.
A power transmission comprising;
- a transmission support and enclosure housing, an input mainshaft(10) journalled in said housing, an output countershaft (11) journalled in said housing parallel to said mainshaft, a first meshing gearset on said shafts comprised of a first pinion (14) nonrotatable on said mainshaft and a first gear (15) rotatable on said countershaft, a second meshing gearset on said shafts comprised of a second gear (17) rotatable on said mainshaft and a second pinion (16) rotatable on said countershaft, said second pinion forming a cluster gear with said first gear, a third meshing gearset on said shafts comprised of a third pinion (20) rotatable on said mainshaft and a third gear(21) nonrotatable on said countershaft, said second gearset being disposed between said first and said third gearsets, first clutch means shiftable to drivingly connect said second gear (17) and said third pinion (20) to establish a first speed drive at a first speed ratio between said shafts, second clutch means shiftable to drivingly connect said third pinion (20) and said mainshaft only when said first clutch means are in a non-actuated state to establish a second speed drive at a second speed ratio between said shafts, said first speed ratio equal to the multiplicative product of said first said second and said third meshing gearsets ratio, said second speed ratio equal to said third meshing gearset ratio.
A tractor power transmission comprised of;
- a transmission housing disposed at a rearward portion of said tractor, a primary shaft (40A) journalled in said housing, a hollow mainshaft (10A) journalled in said housing generally below and parallel to said primary shaft, a countershaft (11A) journalled in said housing parallel to said mainshaft, a final drive differential (54) journalled in said housing perpendicular to said countershaft, gear means to drivingly connect said primary shaft and said mainshaft, gear means to drivingly connect said mainshaft and said countershaft, gear means to drivingly connect said countershaft and said final drive differential, a PTO drive shaft (71) journalled in said housing and passing axially within said hollow mainshaft and protruding forwardly and rearwardly from within said mainshaft, a coaxial rearward extension (72) to said PTO drive shaft journalled in said housing and leaving said housing rearwardly to provide a rear PTO output (RR) to power work tools mounted generally at the rear of said tractor, a coaxial forward extension to said PTO drive shaft journalled in said housing and leaving said housing forwardly to provide a forward PTO output (P), gear means to drivingly connect said primary shaft and said PTO drive shaft, a forward PTO case (81) disposed at a forward portion of said tractor, a forward PTO top shaft (79) journalled in said forward PTO case parallel to said PTO drive shaft and leaving said forward PTO case rearwardly to interconnect with and be driven by said forward PTO output, a forward PTO bottom shaft (80) journalled in said forward PTO case parallel to and generally below said forward PTO top shaft, gear means to drivingly connect said forward PTO top shaft and said forward PTO bottom shaft, a rearward extension to said PTO bottom shaft protruding rearwardly from said forward PTO case to provide a middle PTO output (M) to power work tools mounted generally at the middle of said tractor, at least one forward shaft extension protruding forwardly from said forward PTO case to provide a front PTO output (F1, F2) to power work tools mounted generally at the front of said tractor.
Dependencies are inferred from the claim text.