Construction Machine

A construction machine comprising:

• a self-propelled lower traveling structure comprising a crawler belt rotated by a traveling hydraulic motor;
• an upper revolving structure provided rotatably on the lower traveling structure via a revolving device;
• a working mechanism provided rotatably at a front portion of the upper revolving structure and includes a boom, an arm and a bucket respectively each rotated by a boom cylinder, an arm cylinder and a bucket cylinder respectively each composed of a hydraulic cylinder;
• and a hydraulic system driving the lower traveling structure, the upper revolving structure and the working mechanism, wherein
• the revolving device comprises:
• a revolving ring supporting rotatably the upper revolving structure on the lower traveling structure;
• and
• a revolving hydraulic motor provided on the upper revolving structure and revolving the upper revolving structure on the lower traveling structure along the revolving ring, wherein
• the hydraulic system comprises:
• a closed circuit system supplying and discharging hydraulic oil between respectively each of the boom cylinder, the arm cylinder, the bucket cylinder and the revolving hydraulic motor as hydraulic actuators,
• an open circuit system supplying hydraulic oil to the closed circuit system and the traveling hydraulic motor as the hydraulic actuators, and supplying hydraulic oil from a hydraulic oil tank to each of the hydraulic actuators, wherein
• the upper revolving structure comprises:
• a revolving frame supported rotatably on the lower traveling structure via the revolving ring;
• a prime mover provided on a rear side of the revolving frame;
• a plurality of closed circuit hydraulic pumps and a plurality of open-circuit hydraulic pumps driven by the prime mover and included in the closed circuit system and the open circuit system respectively;
• a control valve device located forward of the prime mover, the plurality of closed circuit hydraulic pumps and the plurality of open-circuit hydraulic pumps, provided on the revolving frame and composed of a plurality of control valves mounted on a rectangular manifold;
• a plurality of pump side pipes connecting the plurality of closed circuit hydraulic pumps, the plurality of open-circuit hydraulic pumps and the control valve device;
• and
• a plurality of actuator side pipes connecting the control valve device, the boom cylinder, the arm cylinder, the bucket cylinder of the working mechanism, the revolving hydraulic motor of the revolving device and the traveling hydraulic motor, wherein
• the control valve device comprises the plurality of control valves located on a front surface of the manifold facing forward and a plurality of pipe joint ports located on the front surface of the manifold and connected to the plurality of actuator side pipes, and is disposed rearward of the revolving hydraulic motor such that the front surface of the manifold faces the revolving hydraulic motor, and
• a valve attachment area is provided at a central portion of the manifold in the right-and-left direction of the front surface of the manifold and mounted the plurality of control valves,
• pipe attachment areas are provided outward of the valve attachment area in the right-and-left direction sandwiching between the valve attachment area of the front surface of the manifold and each provided the pipe joint ports mounted the plurality of actuator side pipes extending forward of the manifold, and
• the plurality of pump side pipes is connecting from above to the upper surface of manifold.