In the cooling system of construction equipment equipped with a plural number of heat exchangers including radiators, in providing a pressurized sealed type reservoir tank connected in parallel with radiators in the cooling water circulation system between the radiators and engine, said reservoir tank is arranged so as not to protrude upward exchanger other than radiator is set to be as the upper tier heat exchanger, and the radiator and oil cooler other than the above heat exchanger are arranged lower than the upper tier heat exchanger, and the horizontal width of inter-cooler thus arranged is made shorter than the horizontal width of radiator and oil cooler, and the tank space is formed laterally to the inter-cooler and thus pressurized sealed type reservoir tank is arranged for said tank space.

A work machine includes a first cooling unit that protrudes from a first wall surface at a first position of a main flow path and defines a first opening portion between the second wall surface and the first cooling unit; a second cooling unit that protrudes from the second wall surface on a downstream side of the first position in the flow path direction of the main flow path, defines a second opening portion between the first wall surface and the second cooling unit and partly overlaps with the first cooling unit when viewed from the flow path direction; and partition member that defines a first section flow path having the first cooling unit as an inlet and the second opening portion as an outlet and a second section flow path having the first opening portion as an inlet and the second cooling unit as an outlet.

A hybrid construction machine includes: a motor generator system connected to an internal combustion engine and performing a motor generator operation; an electric power accumulation system connected to the motor generator system; a load drive system connected to the electric power accumulation system and being driven electrically; an abnormality detection part equipped to the motor generator system, the electric power accumulation system and the load drive system; and a main control part determining whether an abnormality has occurred based on a detection value of the abnormality detection part. When the abnormality determination part determines that an abnormality has occurred, the main control part stops a drive of a drive system in which the abnormality is detected in the load drive system.

A movement processing unit is configured to generate operation signals of a work equipment and a swing body for moving a bucket to a loading point based on a start command of an automatic movement of the bucket. A stop processing unit is configured to brake a swing of the swing body based on a stop command of the automatic movement of the bucket, and is further configured to generate an operation signal for retreating the work equipment when a height of the bucket is lower than the loading point.

A hydraulic excavator includes: a revolving frame; a work implement including a first actuator and a second actuator; a control valve; and a first pipe through which hydraulic oil flows between the control valve and each of the first actuator and the second actuator. The first pipe includes: a first conduit connected to the control valve; a second conduit and a third conduit that are connected to the first actuator and the second actuator, respectively; and a first branch portion at which the first conduit branches into the second conduit and the third conduit. A first region and a second region are on one side and the other side respectively with respect to the virtual straight line passing through a center of swing of the revolving frame. In the first region, a work implement is disposed. In the second region, the control valve and the first branch portion are disposed.

To provide a cab coming-off prevention structure of a working machine capable of preventing a coming-off prevention device from falling off.

One end side of a stopper shaft portion 51 of a coming-off prevention device 16 is inserted through a through-hole 37a. The other end side of the stopper shaft portion 51 is inserted through an insertion hole 23b. A stopper main body portion 52 is provided on the other end of the stopper shaft portion 51. A portion of the key member 53 is fitted into a notched portion 51c provided along a direction crossing an axial direction of one end side the stopper shaft portion 51. The other part of the key member 53 protruding from the stopper shaft portion 51 is fixed to the one of the cab 14 and the revolving frame 23. Even if the key member 53 is disconnected from the cab 14 or the revolving frame 23, the coming-off prevention device 16 can be prevented from falling off, without the stopper shaft portion 51 coming off the through-hole 37a, because a portion of the key member 53 is fitted into the notched portion 51c of the stopper shaft portion 51.

A display device has a display screen that displays a real image captured by an image capture device mounted in a construction machine which includes working equipment, and a combined image obtained by overlapping an object image indicating a virtual viewpoint image of an object around the construction machine viewed from a virtual viewpoint of an outside of the construction machine and a construction machine image indicating a virtual viewpoint image of the construction machine viewed from the virtual viewpoint, wherein the display device displays the combined image simultaneously with the real image in a partial region of the real image displayed in the display screen.

A bucket position acquisition unit acquires a plane position of a contour point of a bucket in a plan view from the top and a height thereof from a work machine having work equipment including a boom, an arm, and the bucket. A current status landform update unit updates a height in current status landform data related to the plane position of the bucket to an upper value on the basis of the height of the bucket in a case where a work state is a predetermined work state.

A loaded machine information acquisition unit acquires position information and azimuth direction information of a transport vehicle. An earth removal position-specifying unit specifies an earth removal position for loading a load target onto the transport vehicle, based on the position information and the azimuth direction information. A bucket position-specifying unit specifies a position of a bucket. An operation signal generation unit generates an operation signal for moving the bucket from the specified position to the earth removal position.

A process for determining a setpoint rotational speed of a work machine engine, having a continuously variable transmission, based on operation of power hydraulics. The setpoint rotational speed for highly productive operation is determined, without knowledge current operation of the power hydraulics, by a basic engine speed setting. With knowledge of the current operating state, the setpoint rotational speed is determined by the basic speed settings and low or high engine speed settings. The low speed setting alone determines setpoint rotational speeds that are lower than the basic speed setting or a combination of the low and basic speed settings. The high speed setting alone determines setpoint rotational speeds that are higher than the basic speed setting or a combination of the basic and high speed settings. The speed settings can comprise a setpoint rotational speed range of above a reciprocal transmission range of the variable transmission.