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US 4,727,759 AGranted
Power transmission mechanism for a tractor
AssigneeKanzaki Kokyukoki Mfg. Co., Ltd.
InventorsKojiro Yamaoka, Shusuke Nemoto
Life of this patent
Estimating the term…
Abstract
A front and rear transmission casing are joined to form a single casing. Upper and lower input shafts are received and supported by the front casing. The lower input shaft drives a change speed gearing with a speed change shaft and a pinion shaft. The pinion shaft has a pinion gear located on a further end of the shaft and engages a ring gear of a differential. The upper input shaft drives a clutch driven shaft through a PTO clutch unit. A rear PTO shaft is driven by the clutch driven shaft and extends out of the rear casing. A mid PTO shaft is also driven by the clutch driven shaft and extends out of the front casing.
Claims6
A power transmission mechanism for a tractor, comprising:
- a front transmission casing;
- a rear transmission casing;
- means coupling said front transmission casing to said rear transmission casing to define a single transmission casing;
- means for receiving and supporting an upper rotatable input shaft near the top of said front casing;
- means, located generally below said coupling means, for receiving and supporting a lower rotatable input shaft in said front casing;
- a drive-speed changing unit comprising:
- (a) a speed change shaft, driven by said lower input shaft, located generally below and to the side of said lower input shaft;
- and
- (b) a pinion shaft, driven by said speed change shaft, located generally below and to the side of said speed change shaft;
- a pinion gear on the end of said pinion shaft that extends toward said rear casing;
- a differential gear unit supported within said rear casing, said differential gear unit comprising a ring gear driven by said pinion gear;
- a PTO clutch unit with a clutch shaft coupled to said upper input shaft;
- a clutch driven shaft extending from said PTO clutch unit;
- a rear PTO shaft located generally below said clutch unit and extending out of said rear casing;
- a fixed gear on said rear PTO shaft located at the end of said rear PTO shaft nearest said clutch unit;
- a mid PTO shaft located generally below said rear PTO shaft and beside said pinion shaft, and extending out of said front transmission casing;
- a fixed gear on said mid PTO shaft;
- and
- drive means coupling said clutch driven shaft to said mid PTO shaft, and to said rear PTO shaft.
16 more elements
A power transmission mechanism for a tractor, comprising:
- a front transmission casing;
- a rear transmission casing;
- means coupling said front transmission casing to said rear transmission casing to define a single transmission casing;
- means for receiving and supporting an upper rotatable input shaft near the top of said front casing;
- means, located generally below said coupling means, for receiving and supporting a lower rotatable input shaft in said front casing;
- a drive-speed changing unit comprising:
- (a) a speed change shaft, driven by said lower input shaft, located generally below and to the side of said lower input shaft;
- and
- (b) a pinion shaft, driven by said speed change shaft, located generally below and to the side of said speed change shaft;
- a pinion gear on the end of said pinion shaft that extends toward said rear casing;
- a differential gear unit supported within said rear casing, said differential gear unit comprising a ring gear driven by said pinion gear;
- a PTO clutch unit with a clutch shaft coupled to said upper input shaft;
- a clutch driven shaft extending from said PTO clutch unit;
- a rear PTO shaft located generally below said clutch unit and extending out of said rear casing;
- a fixed gear on said rear PTO shaft located at the end of said rear PTO shaft nearest said clutch unit;
- a mid PTO shaft located generally below said rear PTO shaft and beside said pinion shaft, and extending out of said front transmission casing;
- a fixed gear on said mid PTO shaft;
- a PTO changeover shaft located generally between said rear PTO shaft and said mid PTO shaft;
- means for driving said PTO changeover shaft with said clutch driven shaft;
- and
- driving means, on said PTO changeover shaft, for driving said mid PTO shaft and said rear PTO shaft, comprising:
- a first gear, coupled to said clutch driven shaft,
- a second gear, coupled to said mid PTO shaft,
- a third gear, coupled to said rear PTO shaft, and
- a changeover slider, having a first position for engaging said first gear with said second gear, and a second position for engaging said first gear with both said second and said third gears.
22 more elements
A power transmission mechanism for a tractor, comprising:
- a front transmission casing;
- a rear transmission casing;
- means coupling said front transmission casing to said rear transmission casing to define a single transmission casing;
- means for receiving and supporting an upper rotatable input shaft near the top of said front casing;
- means, located generally below said coupling means, for receiving and supporting a lower rotatable input shaft in said front casing;
- a drive-speed changing unit comprising:
- (a) a speed change shaft, driven by said lower input shaft, located generally below and to the side of said lower input shaft;
- and
- (b) a pinion shaft, driven by said speed change shaft, located generally below and to the side of said speed change shaft;
- a pinion gear on the end of said pinion shaft that extends toward said rear casing;
- a front vertical wall;
- a rear vertical wall;
- longitudinal vertical walls connecting said front vertical wall and said rear vertical wall;
- an axle housing;
- a differential gear unit supported within said rear transmission casing by said longitudinal wall and said axle housing, said differential gear unit comprising a ring gear driven by said pinion gear;
- a PTO clutch unit with a clutch shaft coupled to said upper input shaft;
- a clutch driven shaft extending from said PTO clutch unit;
- a rear PTO shaft located generally below said clutch unit and extending out of said rear casing;
- a fixed gear on said rear PTO shaft located at the end of said rear PTO shaft nearest said clutch unit;
- a mid PTO shaft located generally below said rear PTO shaft and beside said pinion shaft, and extending out of said front transmission casing;
- a fixed gear on said mid PTO shaft;
- and
- drive means coupling said clutch driven shaft to said mid PTO shaft, and to said rear PTO shaft.
20 more elements
Dependencies are inferred from the claim text.