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Ground milling machine having a cooling system, cooling system, and method for cooling a ground milling machine

  • US 10,100,712 B2
  • Filed: 06/12/2015
  • Issued: 10/16/2018
  • Est. Priority Date: 06/12/2014
  • Status: Active Grant
First Claim
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1. A ground milling machine, comprising:

  • an internal combustion engine arranged in an engine compartment;

    a hydraulic system with at least one hydraulic pump and travelling devices which are driven by individual hydraulic motors;

    a milling gear driven directly or indirectly by the internal combustion engine, the milling gear comprising a drive pulley, a driven pulley and a traction device as a part of a belt drive;

    a cooling system with an engine cooling device and a hydraulic fluid cooling device;

    the engine cooling device comprising a first fan and a cooling circuit with an engine heat exchanger;

    a first cooling air duct formed such that cooling air aspirated by the first fan from the ambient environment is guided to the engine heat exchanger and subsequently to a first cooling air outlet;

    wherein the hydraulic fluid cooling device comprises a second fan and a hydraulic fluid heat exchanger,wherein a second cooling air duct is implemented such that cooling air aspirated from the ambient environment by the second fan is guided to the hydraulic fluid heat exchanger and subsequently to a second cooling air outlet,wherein the first cooling air duct and the second cooling air duct are implemented so as to conduct the cooling air of the first cooling air duct and the cooling air of the second cooling air duct through the engine cooling device and the hydraulic fluid cooling device separately from each other and by circumventing the engine compartment,wherein the ground milling machine is configured to be operated in working operation and in travelling operation,the working operation designating an operating mode in which the ground milling machine travels at a substantially constant first speed and mills the ground surface with a rotating milling drum leading to a first load of the internal combustion engine and a second load of the hydraulic system, with the second load being less than the first load during the working operation,the travelling operation designating an operation mode in which the milling drum is idle and the ground milling machine travels at a second speed which is greater than the first speed leading to a third load of the internal combustion engine and a fourth load of the hydraulic system, with the third load being less than the fourth load during the travelling operation,so that a first heating of a cooling liquid of the internal combustion engine and a second heating of the hydraulic oil of the hydraulic system occurs in working operation, with the first heating being greater than the second heating during the working operation, and a third heating of the cooling liquid of the internal combustion engine and a fourth heating of the hydraulic oil of the hydraulic system occurs in travelling operation, with the third heating being less than the fourth heating during the travelling operation, andwherein the first fan is operated in working operation of the ground milling machine substantially under full load or at maximum speed, whereas the second fan is operated in travelling operation of the ground milling machine substantially under full load or at maximum speed so that the first and the second fans are alternatively or oppositely loaded to a lesser or greater extent with respect to each other, or their speeds are controlled in opposite directions with respect to each other, with the first and second fans being controlled individually and independently of each other.

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