PROBLEM TO BE SOLVED: To provide a riding-type tiller enabling a rotor to be swiftly subject to vertically moving operation by ensuring a power transmission mechanism to be quickly followingly operated when respective parts move and/or spaces among the respective parts are varied as the rotor for tilling is vertically moved.SOLUTION: The riding-type tiller (A) has a vertically movable tilling rotor provided in between front wheels and rear wheels, a lift operation mechanism (8) functioning to vertically move the rotor, a tilling driving system (7) for driving the rotor, and a travel driving system (5) for driving the front wheels. In this tiller (A), the mechanical power of a prime mover (E) is transmitted through a power transmission mechanism (4) to the travel driving system (5) and the tilling driving system (7), and these systems (5) and (7) are integratedly revolvable around a revolving shaft (56), wherein the power transmission mechanism (4) has a retractile drive shaft (42) whose basal end is connected via a universal joint (41) to a power output shaft (13) and a power distribution shaft functioning to distribute the mechanical power transmitted from the drive shaft (42) to the travel driving system (5) and the tilling driving system (7).COPYRIGHT: (C)2009,JPO&INPIT【課題】耕耘用のローターの昇降に伴って各部が動いたり各部の間隔が変化したときに、動力伝達装置がそれらに素早く追従して動くことができるようにしてローターの迅速な昇降操作を可能とした乗用型耕耘機を提供する。【解決手段】乗用型耕耘機(A)は、前輪と後輪の間に設けられ昇降動可能な耕耘用のローターと、ローターを昇降動させる昇降操作装置(8)と、ローターを駆動する耕耘駆動系(7)と、前輪を駆動する走行駆動系(5)とを有し、走行駆動系(5)と耕耘駆動系(7)には動力伝達装置(4)で原動機(E)の動力が伝えられ、走行駆動系(5)と耕耘駆動系(7)は一体となって回動軸(56)を中心として回動可能で、動力伝達装置(4)は基端がユニバーサルジョイント(41)を介し動力取出軸(13)に接続されている伸縮可能なドライブシャフト(42)と、ドライブシャフト(42)から伝えられる動力を走行駆動系(5)と耕耘駆動系(7)に分配する動力分配軸とを備えている。【選択図】図9
