TRANSMISSION STRUCTURE OF WORK MACHINE

摘要

PROBLEM TO BE SOLVED: To provide a transmission structure capable of achieving miniaturization and reduction of a cost of a work machine. SOLUTION: In this transmission structure of the work machine, power from an engine 7 is transmitted to a traveling device 1 through a hydrostatic continuously variable transmission 9 and a transmission system 11 for traveling installed in a transmission case 8. A recessed part 29 is formed on a side wall 28 of the transmission case 8. A piston pump 30 and a piston motor 31 are accommodated in the recessed part 29. A port block 34 wherein oil passages 32 and 33 for connecting the piston pump 30 and the piston motor 31 are formed is joined to the side wall 28 in order to close the recessed part 29. Thus, the hydrostatic continuously variable transmission 9 is accommodated inward of the transmission case 8. An oil passage 43 for the static hydraulic continuously variable transmission 9 is formed on a mating face 41 of the side wall 28 and the port block 34.