초록 ▼

An HST system driving speed changing apparatus, including a hydraulic motor, which constitutes the HST system driving speed changing apparatus wherein the transmission case of the apparatus is also used as the hydraulic motor case. This construction facilitates assembly of the apparatus and therefor

An HST system driving speed changing apparatus, including a hydraulic motor, which constitutes the HST system driving speed changing apparatus wherein the transmission case of the apparatus is also used as the hydraulic motor case. This construction facilitates assembly of the apparatus and therefore allows a savings in manufacturing cost. Also disclosed is an HST system driving speed changing apparatus, which provides a separate hydraulic pump. The pump has a changeable mounting position at the side surfaces of the transmission case, whereby the pump shaft can correspond to whichever direction the crank shaft of the engine is disposed.

대표청구항 ▼

An HST system driving speed changing apparatus comprising: a transmission case divided into first and second transmission case portions; a first axle being journaled to said first transmission case portion; a second axle being journaled to said second transmission case portion; a driving power trans

An HST system driving speed changing apparatus comprising: a transmission case divided into first and second transmission case portions; a first axle being journaled to said first transmission case portion; a second axle being journaled to said second transmission case portion; a driving power transmission system disposed within said second transmission case portion; a differential gear unit disposed within said second transmission case portion; a piston holder disposed within said first transmission case portion; a plurality of pistons fitted within said piston holder; a swash plate base disposed between said first and second transmission case portions and supporting a thrust bearing, whereby said pistons abut against said thrust bearing; a hydraulic motor disposed within said transmission case, said hydraulic motor comprising a hydraulic motor shaft journaled at said first transmission case portion and fixing said piston holder; said hydraulic motor shaft disposed parallel to said first and second axles; and said hydraulic motor shaft extending from said first transmission case portion through said fixed swash plate base and into said second transmission case portion for connection with said driving power transmission system.