POWER EXTRACTION DEVICE FOR WORK MACHINE

To reduce the size of a gear transmission mechanism in a direction along the axial core direction of an output shaft in a power extraction device for a work machine, which includes: a gear transmission mechanism that changes power of an input shaft to power having rotational speeds at four different steps and transmits the power to the output shaft; and a power extraction shaft interlocked and coupled with the output shaft.SOLUTION: A gear transmission mechanism M comprises: a first gear train 46 in which a first input shaft gear 46A is interlocked and coupled with an input shaft 43, and a first output shaft gear 46B is interlocked and coupled with an output shaft 45, thereby transmitting power of the input shaft 43 to the output shaft 45; a second gear train 47 in which a second input shaft gear 47A is interlocked and coupled with the input shaft 43, a second output shaft gear 47B is interlocked and coupled with the output shaft 45, thereby transmitting power of the input shaft 43 to the output shaft 45; and a relay transmission shaft 70 interlocked and coupled with the first output shaft gear 46B via a first relay transmission gear mechanism 71 and interlocked and coupled with the second output shaft gear 47B via a second relay transmission gear mechanism 72.SELECTED DRAWING: Figure 3 【課題】入力軸の動力を回転速度が４段階に異なる動力に変速して出力軸に伝達するギヤ変速機構、出力軸に連動連結された動力取出し軸を備える作業機の動力取出し装置において、出力軸の軸芯方向に沿う方向でのギヤ変速機構の大きさを小さく済ませる。【解決手段】第１入力軸ギヤ４６Ａが入力軸４３に連動連結され、第１出力軸ギヤ４６Ｂが出力軸４５に連動連結されることで、入力軸４３の動力を出力軸４５に伝達する第１ギヤ列４６と、第２入力軸ギヤ４７Ａが入力軸４３に連動連結され、第２出力軸ギヤ４７Ｂが出力軸４５に連動連結されることで、入力軸４３の動力を出力軸４５に伝達する第２ギヤ列４７と、第１出力軸ギヤ４６Ｂに第１中継伝動ギヤ機構７１を介して連動連結され、第２出力軸ギヤ４７Ｂに第２中継伝動ギヤ機構７２を介して連動連結された中継伝動軸７０とが、ギヤ変速機構Ｍに備えられている。【選択図】図３