The present disclosure relates to a work machine, in particular to a hydraulic excavator, having at least one ballast device, wherein the ballast device comprises at least one ballast weight and at least one ballast support. The present disclosure is furthermore directed to a ballast weight for a corresponding work machine.

The reducing agent tank has a tank main body and a feed pipe. The tank main body stores a reducing agent to be supplied to an exhaust gas treatment device. The feed pipe protrudes from the tank main body. The feed pipe is provided to replenish the tank main body with the reducing agent. A support base supports a vessel for the reducing agent for replenishment of the reducing agent tank. The support base is variable in position between a developed position in which the support base is arranged at a greater distance from the tank main body than from the feed pipe in a direction of protrusion of the feed pipe from the tank main body in a plan view and a stored position in which the support base is stored in an exterior cover.

There are provided an electric motor (12) that is driven by an engine (8) to generate electric power or assists in a drive of the engine (8) by supply of electric power thereto, a heat exchanger (13) to which cooling air is supplied by a cooling fan (8A), a heat exchanger upstream room (28) that is positioned upstream of the heat exchanger (13) in a flow direction of the cooling air supplied to the heat exchanger (13), and an electricity storage device (30) that stores or discharges electric power. In addition, a radiator (42) for electricity storage device, a cooling pump (43) for electricity storage device and a cooling line (44) for electricity storage device configure a cooling system (41) for electricity storage device that independently cools the electricity storage device (30) aside from the inverter device (34), and the cooling system (41) for electricity storage device is arranged in the heat exchanger upstream room (28).

There are provided an electric motor (12) that is driven by an engine (8) to generate electric power or assists in a drive of the engine (8) by supply of electric power thereto, a heat exchanger (13) to which cooling air is supplied by a cooling fan (8A), a heat exchanger upstream room (28) that is positioned upstream of the heat exchanger (13) in a flow direction of the cooling air supplied to the heat exchanger (13), and an electricity storage device (30) that stores or discharges electric power. In addition, a radiator (42) for electricity storage device, a cooling pump (43) for electricity storage device and a cooling line (44) for electricity storage device configure a cooling system (41) for electricity storage device that independently cools the electricity storage device (30) aside from the inverter device (34), and the cooling system (41) for electricity storage device is arranged in the heat exchanger upstream room (28).

A machine is adapted for operation powered by any one of a plurality of interchangeable power sources. The machine may include an undercarriage configured for supporting ground engagement members that propel the machine and an upper structure rotatably supported on the undercarriage. The upper structure may include a swing frame, with the swing frame supporting an operator cab, any one of the plurality of interchangeable power sources, hydraulic components, electrical components, and a counterweight disposed at a first end of the swing frame. The counterweight may include a hollowed out portion facing toward the swing frame. The hollowed out portion of the counterweight may be centrally aligned with a center core portion of the swing frame configured for supporting any one of the plurality of interchangeable power sources, with the one power source being partially accommodated within the hollowed out portion of the counterweight.

A machine is adapted for operation powered by any one of a plurality of interchangeable power sources. The machine may include an undercarriage configured for supporting ground engagement members that propel the machine and an upper structure rotatably supported on the undercarriage. The upper structure may include a swing frame, with the swing frame supporting an operator cab, any one of the plurality of interchangeable power sources, hydraulic components, electrical components, and a counterweight disposed at a first end of the swing frame. The counterweight may include a hollowed out portion facing toward the swing frame. The hollowed out portion of the counterweight may be centrally aligned with a center core portion of the swing frame configured for supporting any one of the plurality of interchangeable power sources, with the one power source being partially accommodated within the hollowed out portion of the counterweight.

A firewall (11) is provided as a partition between an engine room (25) in which an engine (7) and an exhaust gas post-treatment device (10) are arranged and a pump room (26) in which a hydraulic pump (8) is arranged. A rear surface plate (13) of the firewall (11) is provided with an outflow opening (28) for causing cooling air sucked into the engine room (25) to flow out toward a counterweight (6). Aright weight part (6C) of the counterweight (6) is provided with an exhaust opening (29) in a position facing the outflow opening (28) for causing cooling air having flowed out from the outflow opening (28) to be discharged to an exterior.

A firewall (11) is provided as a partition between an engine room (25) in which an engine (7) and an exhaust gas post-treatment device (10) are arranged and a pump room (26) in which a hydraulic pump (8) is arranged. A rear surface plate (13) of the firewall (11) is provided with an outflow opening (28) for causing cooling air sucked into the engine room (25) to flow out toward a counterweight (6). Aright weight part (6C) of the counterweight (6) is provided with an exhaust opening (29) in a position facing the outflow opening (28) for causing cooling air having flowed out from the outflow opening (28) to be discharged to an exterior.

A working machine includes: a counterweight having a weight outer surface having such a shape as to cover at least a part of left and right portions of the machine chamber and cover a rear portion thereof, a weight inner surface, and a weight top surface; and an antenna support member having an antenna attachment part and a plurality of legs. The counterweight has a weight recess part recessed from the weight outer surface toward the weight inner surface at an upper end of the weight outer surface. The legs include a first leg having a first fixed part fixed to the weight recess part, and a second leg having a second fixed part fixed to the weight recess part or the weight top surface.

A working machine includes: a counterweight having a weight outer surface having such a shape as to cover at least a part of left and right portions of the machine chamber and cover a rear portion thereof, a weight inner surface, and a weight top surface; and an antenna support member having an antenna attachment part and a plurality of legs. The counterweight has a weight recess part recessed from the weight outer surface toward the weight inner surface at an upper end of the weight outer surface. The legs include a first leg having a first fixed part fixed to the weight recess part, and a second leg having a second fixed part fixed to the weight recess part or the weight top surface.