Kubota Corporation

Hirofumi Iritani

Tadashi Nakamura

Kenzo Ushiro

Fumiki Sato

Eiishi Ishida

A vibration and sound proofing system for a working vehicle such as a tractor or a lawn mower having a hydrostatic stepless transmission (HST) included in a propelling transmission system for transmitting engine output to wheels. The HST is mounted in a case secured to intermediate mounting plates attached to a gear transmission case through vibration and sound absorbers. Output shafts of the HST are connected to input shafts of a gear transmission through vibration absorbing shaft couplings. Each of the vibration absorbers includes a metallic outer tube, a metallic inner tube disposed concentrically with the outer tube, and a rubber element filled tight in an annular space defined between the outer and inner tubes. The intermediate mounting plates are connected to the transmission case with the outer tubes inserted into bores defined in the intermediate mounting plates, by tightening bolts extending through the inner tubes and through spacers interposed between the inner tubes and the transmission case, respectively.

Vibration and noise proofing system for a hydrostatic stepless

In a four-wheel drive work vehicle selectively drivable in a standard four-wheel drive mode, an accelerated four-wheel drive mode and in a two-wheel drive mode, the invention provides an improved drive-mode switching operability through a linearly operable link mechanism for operatively connecting one operational system for directly operating a shift fork member with another operational system for operating the same via a cam member connected to a steering wheel.

Four-wheel drive work vehicle

A cooling system for an engine mounted in a front portion of a vehicle having a radiator disposed between the engine and a driver's seat, a fan mounted in proximity to the radiator for directing cooling air from the driver's seat to the engine through the radiator, and a cooling air flow passage for interconnecting the fan and ambient air. The cooling air flow passage is provided with an air inlet located away from the driver's seat and defined in the front portion of the vehicle at a forward position than a region of the radiator, extends from the air inlet and is defined by a partition plate and an engine hood.

Cooling system for engine mounted on vehicle

A drive transmission structure for a tractor comprising a propeller shaft extending between and interconnecting an output shaft of an engine disposed forwardly of a driver's section and an input shaft of a transmission disposed rearwardly of the driver's section. The engine is disposed at a rearwardly downward slant with the output shaft thereof extending toward the input shaft of the transmission. The transmission is disposed at a forwardly upward slant with the input shaft thereof extending toward the engine output shaft.

Propeller shaft transmission structure for a tractor

A frame type tractor comprising an engine in a front portion, a transmission case in a rear portion thereof, a transmission shaft extending from the engine to the transmission shaft, and a front wheel drive shaft extending from the transmission case to a front wheel axle. The transmission shaft and front wheel drive shaft are connected to lower positions of the transmission case. An operator's step is mounted over the transmission shaft and front wheel drive shaft.

Frame type tractor

A four wheel drive vehicle comprising dirigible front wheels and nondirigible rear wheels. Drive of an engine is transmitted to the front and rear wheels through a propelling drive transmission for producing at least two, high and low, speeds, a front wheel change speed mechanism, and a rear wheel change speed mechanism. The front and rear wheel change speed mechanisms are controlled by a control device to produce a high speed state with the front wheels accelerated when a steering angle of the front wheels exceeds a predetermined angle and the propelling drive transmission is in a low speed position, to produce a low speed state with the front wheels accelerated when the steering angle of the front wheels exceeds the predetermined angle and the propelling drive transmission is in a high speed position, and to produce a standard state in which the front and rear wheels are driven at the same speed when the steering angle of the front wheels is below the predetermined angle.

Growing community of inventors

Sakai, Japan

Hirofumi Iritani