US 11,447,918 B2Granted

Intentionally replaceable earth working machine milling unit having a cooling fan for cooling a closed operating-medium circuit

AssigneeWirtgen GmbH

InventorsTobias Stinner, Christian Berning, Sebastian Bötzius

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Abstract

A milling unit for an earth working machine including a milling drum and a milling drum housing; the milling unit comprising a closed operating-medium circuit that includes an operating-medium pump that is embodied to drive the operating medium to circulate in the operating-medium circuit; the operating-medium circuit including a heat exchanger through which operating medium flows during circulating flow of the operating medium; the heat exchanger being arranged on the milling drum housing. Provision is made that the heat exchanger is configured for flow impingement by a cooling gas separate from the operating medium; and that a cooling fan, which is embodied to drive the cooling gas for flow impingement onto the heat exchanger, is arranged on the milling drum housing.

Claims12

Dependent claims

A milling unit for an earth working machine, comprising:

a milling drum;
a milling drum housing supporting the milling drum rotatably around a milling drum axis, the milling drum housing surrounding the milling drum on a plurality of sides;
a closed operating-medium circuit including:
an operating-medium pump configured to circulate an operating medium in the operating-medium circuit;
and
a heat exchanger through which the operating medium flows during circulating flow of the operating medium, the heat exchanger being arranged directly or indirectly on the milling drum housing, and the heat exchanger being configured for heat transfer from the operating medium to a cooling gas in an open cooling-gas flow;
a cooling fan arranged directly or indirectly on the milling drum housing and configured to drive the cooling gas for flow impingement onto the heat exchanger;
and
wherein the heat exchanger and the cooling fan are arranged axially farther from the milling drum than is a side wall of the milling drum housing which axially delimits the milling drum housing.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/867,862Filed 6 May 2020
Priority: DE 10 2019 114 184.227 May 2019
Published: US 2020/0378075 A13 Dec 2020
Granted: 20 Sep 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

E01C 23/088
Using power-driven tools, e.g. vibratory tools: rotary tools, e.g. milling drums
E01C 23/127
With power-driven tools, e.g. oscillated hammer apparatus: rotary, e.g. rotary hammers
F16H 57/0416
Air cooling or ventilation; Heat exchangers; Thermal insulations: air cooling or ventilation
F16H 57/0417
Air cooling or ventilation; Heat exchangers; Thermal insulations: heat exchangers adapted or integrated in the gearing