| 摘要 |
PROBLEM TO BE SOLVED: To reduce a production cost by enabling each hydraulic control valve to have compatibility without preparing the hydraulic control valves by each specification when constituting tractors having different specifications. SOLUTION: The tractor carrying out the steering control by the hydraulic oil of a hydraulic pump 2 driven by an engine 1 is constituted as follows. The first metal 5 including a main pressure-reducing valve 4 in the inside, the second metal 8 including a switching valve 7 controlling the switching of driving in four wheel drive, and the switching of acceleration of a front wheel in the inside, and the third metal 10 including a turning-control valve 9 in the inside are attached in piles to the side part of a transmission case 3 constituting a car body so as to be detachable one by one. An oil passage opened in the third metal 10 side of the second metal 8 can be closed by attaching a lid body 11 by removing the third metal 10 positioned at the outside. COPYRIGHT: (C)2007,JPO&INPIT
|
