초록 ▼

A work machine, such as a wheeled loader or dumper, has a cooling and heating system comprising a main line ( 2 ) arranged to contain a fluid, a first heat exchanger ( 4 ) which is connected to the main line ( 2 ), and a charge-air cooler ( 8 ) for cooling compressed charge air for an internal combu

A work machine, such as a wheeled loader or dumper, has a cooling and heating system comprising a main line ( 2 ) arranged to contain a fluid, a first heat exchanger ( 4 ) which is connected to the main line ( 2 ), and a charge-air cooler ( 8 ) for cooling compressed charge air for an internal combustion engine ( 12 ) arranged in the machine, which charge-air cooler ( 8 ) is connected to the main line ( 2 ). A second heat exchanger ( 10 ) is connected to the main line ( 2 ) downstream of the charge-air cooler ( 8 ), to which second heat exchanger ( 10 ) a hydraulic liquid line ( 14 ) is connected, so that heat can be transferred between the fluid in the main line ( 2 ) and the hydraulic liquid in the hydraulic liquid line ( 14 ).

대표청구항 ▼

1. A work machine having an internal combustion engine for driving the machine and at least one hydraulic cylinder, the machine having a cooling and heating system comprising:a main line for a cooling fluid connected for cooling the engine;a hydraulic liquid line for a hydraulic liquid connected for

1. A work machine having an internal combustion engine for driving the machine and at least one hydraulic cylinder, the machine having a cooling and heating system comprising:a main line for a cooling fluid connected for cooling the engine;a hydraulic liquid line for a hydraulic liquid connected for supplying the hydraulic cylinder with hydraulic liquid;a first heat exchanger coupled to the main line and the hydraulic liquid line for transferring heat between the cooling fluid in the main line and the hydraulic liquid in the hydraulic liquid line;a second heat exchanger coupled to the main line for heat exchange between the cooling fluid and air;a variable hydraulic liquid pump connected to the hydraulic liquid line, which hydraulic liquid pump is disposed so as to bring about a variable hydraulic liquid flow in the hydraulic liquid line;a first hydraulic motor connected to the hydraulic liquid line;a fan driven by the hydraulic motor and disposed so as to bring about an air flow through said second heat exchanger in order to cool the fluid in the main line; anda third heat exchanger connected to the hydraulic liquid line and to a lubrication oil line and at least one wheel axle of the machine connected to said third heat exchanger so that heat can be transferred between any lubrication oil in said lubrication oil line and said hydraulic liquid. 2. The work machine according to claim 1, further comprising a working implement, and wherein at least one of the hydraulic cylinders is configured to operate the working implement of the machine. 3. The work machine according to claim 1, further comprising a tank, and wherein said hydraulic liquid line is connected to the tank. 4. The work machine according to claim 1, further comprising a charge air cooler coupled to the main line for cooling already compressed air, which is to be supplied to the engine. 5. The work machine according to claim 4, wherein said first heat exchanger for transferring heat between the cooling fluid in the main line and the hydraulic liquid in the hydraulic liquid line is disposed downstream of said charge air cooler. 6. The work machine according to claim 1, further comprising:a temperature measuring part to measure the temperature of said fluid and to measure the temperature of said hydraulic liquid, anda control unit connected to the hydraulic liquid pump to control the hydraulic liquid pump in response to the measured temperature of said fluid and to the measured temperature of said hydraulic liquid. 7. A work machine, comprising:an internal combustion engine configured to drive the machine;at least one hydraulic cylinder; anda cooling and heating system comprisinga main line for a cooling fluid connected to the engine,a hydraulic liquid line for a hydraulic liquid connected to the hydraulic cylinder,a first heat exchanger coupled to the main line and the hydraulic liquid line for transferring heat between the cooling fluid in the main line and the hydraulic liquid in the hydraulic liquid line,a second heat exchanger coupled to the main line for heat exchange between the cooling fluid and air,a variable hydraulic liquid pump connected to the hydraulic liquid line and configured to bring a variable hydraulic liquid flow in the hydraulic liquid line,a first hydraulic motor connected to the hydraulic liquid line,a fan driven by the hydraulic motor and disposed to bring an air flow through said second heat exchanger in order to cool the fluid in the main line, anda third heat exchanger connected to the hydraulic liquid line and to a lubrication oil line and at least one wheel axle of the machine connected to said third heat exchanger so that heat can be transferred between any lubrication oil in said lubrication oil line and any hydraulic liquid in said hydraulic liquid line. 8. The work machine according to claim 7, further comprising a second hydraulic motor connected to the hydraulic liquid line to drive a lubrication oil pump connected to the lubricati on oil line. 9. The work machine according to claim 7, further comprising wheel axles, and wherein the lubrication oil line is connected to the wheel axles of the machine. 10. The work machine according to claim 7, wherein the lubrication oil line forms a separate circuit for each of a plurality of wheel axles of the machine. 11. The work machine according to claim 1, further comprising a cooling water line connected to the internal combustion engine and including a cab heat exchanger and a transmission heat exchanger in a gear box of the machine, said transmission heat exchanger being connected to the cooling water line downstream of said cab heat exchanger. 12. The work machine according to claim 11, further comprising:a temperature measuring part configured to measure the temperature of transmission oil in the gear box, anda control unit that controls the hydraulic liquid pump in response to the measured temperature of said transmission oil in the gear box.