Kubota Corporation

Kenzo Sada

Yoshinobu Murayama

Mitsuo Watashi

Mitsuhiro Kutomi

Shigeyuki Hayashi

A hydro-mechanical power transmission for vehicles wherein optional two of the three elements of a planetary gearing serve as an input portion and an output portion, and the other element is driven at a steplessly variable speed by a static hydraulic speed change device which is operable by the input portion or the output portion. A change-over device is provided in a power transmission system for the speed change device to drive the other element in different speed ranges by switching the change-over device. For running on the road, the speed is widely variable from low to high, while for working, the running speed is finely adjustable within one of the speed ranges.

Vehicular hydro-mechanical transmission system with speed range shift

A tractor transmission having an input shaft, a PTO system transmission shaft disposed thereunder, a gear-type speed change mechanism for changing the number of rotations of the input shaft, and oil reservoir. A gear in engagement with the gear in said gear-type speed change mechanism is rotatably disposed at said PTO system transmission shaft and blades are disposed at the boss of this first-mentioned gear. At least one side of each of said blades is opened toward said oil reservoir. Lubricating oil in said oil reservoir is utilized as resistance to the blades, thereby to stop the rotation of the gear-type speed change mechanism otherwise caused due to the force of inertia.

Tractor transmission

A transmission comprises a first transmission case, a second transmission case connected to the case, a transmission shaft extending through the connection between the two cases, a tubular member fitting to and provided between the two cases at the position where the shaft extends through the cases, the tubular member having the shaft extending therethrough, and oil seals provided between the outer periphery of the tubular member and the two cases.

Casing for a transmission

A speed change mechanism for a transmission comprises a main shaft provided with a plurality of power transmitting gears, and a propelling speed change gear system and a power takeoff speed change gear system supported on the opposite sides of the main shaft in parallel thereto. Each of the propelling and power takeoff speed change systems includes a speed change shaft freely rotatably carrying a suitable number of speed change gears meshing with the power transmitting gears on the main shaft at all times. The speed change shaft accommodates an axially slidable speed change rod which, when moved, forces pins outward or inward radially of the shaft to couple the speed change shaft to the corresponding speed change gear or disconnect the shaft from the gear. The freely rotatable speed change gears are held against axial movement, while axially slidable engaging members which are otherwise provided between the adjacent speed change gears are eliminated. The transmission therefore has a shortened axial length and does not require a clutch which must be usually provided between the engine and the main shaft. The propelling speed change system further incorporates a creeping assembly of the planetary roller type for super-speed reduction and is provided with a secondary speed change assembly. The transmission also includes a power takeoff assembly for driving the front wheels of the tractor utilizing the secondary speed change assembly.

Growing community of inventors

Sakai, Japan

Kenzo Sada