Yanmar Co., Ltd.

Kanzaki Kokyukoki Mfg. Co., Ltd.

Takeshi Hasebe

Masahisa Kawamura

Takashi Hirano

Toshiyuki Miwa

Tadao Hirai

Katsunori Katou

Yuji Kitasaka

A hydraulically driven traveling vehicle comprising a pair of right and left driving axles (driving sprockets) differentially connected to each other by a differential mechanism, the input section of the differential mechanism having the output rotation of traveling HST() transmitted thereto, both driving sprockets having mutually opposite two-flow output rotations separately transmitted thereto from a steering HST (), thereby effecting traveling driving and turning, electromagnetic solenoids () serving as output regulating devices for the traveling HST and the steering HST being provided so that the manipulated variables and directions of a speed change lever and a steering operation tool are converted into electric signals, on the basis of which electric signals the output current values of the electromagnetic solenoids are controlled, causing the respective output rotary speeds of the HSTs to correspond to the output current values.

Hydraulically driven traveling vehicle

A transmission system for vehicle transmission mechanism (B) having a low speed hydraulic clutch (CL) and a high speed hydraulic clutch (CH) as a wet multi-disk clutch for transmission, wherein both the low speed hydraulic clutch (CL) and the high speed hydraulic clutch (CH) are disengaged so as to disconnect a transmission of an engine power to the transmission system, namely, so as to bring a main clutch into off condition, a dry clutch device (A) is installed on the upstream side of transmission of the transmission mechanism as a corotation prevention mechanism, only the low speed hydraulic clutch (CL) of large capacity is used as an inching clutch to bring the main clutch into a partial engaged condition when the main clutch is moved to on or off in the transmission mechanism (B) and, when the main clutch is operated from off to on with a shift lever ( ) set at a high speed position, hydraulic pressure control is performed so that the high speed hydraulic clutch (CH) is brought into off condition and the low speed hydraulic clutch (CL) is brought into the partial engaged condition in the off range (D ) and inching range (D ) of the main clutch, of a clutch pedal ( ), respectively.

Transmission system structure of vehicle

Growing community of inventors

Osaka, Japan

Takeshi Hasebe