| 摘要 |
Disclosed is a construction machine that enables an operator to operate a vehicle width changing control lever while visually confirming positions of crawlers. The construction machine includes a lower track structure 1 whose left and right crawler track devices 11A and 11B are adapted to change in spatial interval, and an upper swing structure 2 swingably mounted above the lower track structure. The construction machine further includes a hydraulically actuated cylinder for changing vehicle width, disposed between the left and right crawler track devices, the vehicle width changing cylinder changing the interval between the left and right crawler track devices upon supply and discharge of a hydraulic fluid being controlled by a vehicle width changing control valve, and a vehicle width changing control lever 34 disposed on a left section of a swing body support structure 50 relative to an operator's seat 23, the vehicle width changing control lever operating the vehicle width changing control valve. |
| 主权项 |
1. A construction machine comprising:
a lower track structure whose left and right crawler track devices are adapted to change in spatial interval; an upper swing structure swingably mounted above the lower track structure, the upper swing structure including
a swing frame that forms a support structure,a counterweight disposed at a rear section of the swing frame,a seat base supported by the swing frame, disposed at a front side of the counterweight, and forming a swing body support structure in combination with the swing frame,an operator's seat placed on the seat base, anda floor panel positioned at a front side of the seat base and the operator's seat and forming an operator's accessway, andleft and right control lever devices arranged respectively to the left and right of the operator's seat on the seat base, wherein the construction machine is configured as a rear ultrasmall-swing machine in which the seat base disposed so as to shroud devices including an engine and a hydraulic pump, and on a front right side of the swing frame a fuel tank and a hydraulic fluid tank are arranged and that the back end of the counterweight is positioned anterior to the back end of the lower track structure, wherein the construction machine comprises:a hydraulically actuated cylinder for changing vehicle width, disposed between the left and right crawler track devices, the vehicle width changing cylinder changing the interval between the left and right crawler track devices upon supply and discharge of a hydraulic fluid being controlled by a vehicle width changing control valve; anda vehicle width changing control lever for operating the vehicle width changing control valve, wherein the seat base includes a left seatbase portion on which the left control lever device is arranged, a right seatbase portion on which the right control lever device is arranged, and a middle seatbase portion that is placed therebetween and on which the operator's seat is arranged, and an outer peripheral of the left seatbase portion is shrouded with an outer cover, the middle seatbase portion includes left and right sidewalls for further separating an internal region of the seat base from the left and right seatbase portions, and the left seatbase portion includes a partition wall that further splits the internal region of the seat base vertically, and the left seatbase portion has an upper panel that has a back-and-forth elongated lever hole formed at a rear section of the left control lever device, and the vehicle width changing control lever is configured to extend downward through the back-and-forth elongated lever hole and to be coupled at its lower end to a pivoting section of a linkage mechanism mounted at one end thereof on the partition wall of the left seatbase portion via a bracket. |
