SELF-TRAVEL WORKING MACHINE

摘要

PROBLEM TO BE SOLVED: To provide a self-travel working machine capable of making upper limit of a rotation speed of the working machine large as a working radius is small in the self-travel working machine provided with a working machine having a telescopic boom and a rotation means for rotating the working machine. SOLUTION: The self-travel working machine is provided with a stroke sensor 52 for detecting an elongation amount of the boom 31; an angle sensor 53 for detecting a derricking angle of the boom 31; a variable throttle means 51 for making upper limit of a cross section of flow of an operation oil flowing into a rotation cylinder 21 variable; and a controller 60 for controlling the variable throttle valve 51 in response to detection signals from the stroke sensor 52 and the angle sensor 53. The variable throttle valve 51 is controlled such that the throttle amount of the cross section of flow of the operation oil flowing into the rotation cylinder 21 becomes large as the working radius is large and the variable throttle valve 51 is controlled such that the throttle amount of the cross section of flow of the operation oil flowing into the rotation cylinder 21 becomes small as the working radius is small. COPYRIGHT: (C)2005,JPO&NCIPI