Self-propelled surface milling machine with electrical mill roll drive

摘要

The present invention relates to a self-propelled surface milling machine, preferably in the form of an asphalt-milling machine, snow-milling machine or Surface Miner, having a mill roll which is drivable about a rotational axis, and a mill roll drive comprising an electrical motor which is accommodated within the mill roll, wherein stator and rotor of the electrical motor are accommodated within a dust and air-tightly sealed motor housing. It will be suggested to associate a cooling device comprising a closed circuit liquid cooling system to the electrical motor located within the milling roll body. Due to the high heat capacity of a suitable coolant, such as oil or mixed water and glycol small volume flows and hence small conduit cross sections will be sufficient. On the other hand, any incorporation of dust into the mill-roll drive as well as any formation of dust by discharge air can be avoided by the closed form of the circuit liquid cooling system.

主权项

1. Self-propelled surface milling machine, having a mill roll (2) which is drivable about a rotational axis, and a mill roll drive (7) comprising at least one electrical motor (20) which is accommodated within the mill roll (2), stator (13) and rotor (12) of the electrical motor (20) being accommodated within an internal space (29) of a dust and air-tightly sealed motor housing (21) wherein a cooling device (24) comprising a closed circuit liquid cooling system (23) is associated with the at least one electrical motor (20) wherein the closed circuit liquid cooling system (23) includes circulation of a coolant through a closed loop, the mill roll (2) defining a front side positioned at an end of a longitudinal axis of the mill roll (2),
wherein the circuit liquid cooling system (23) has a heat exchanger which is located outside of the mill roll (2), for cooling of coolant, which is connected to one part of the circuit liquid cooling system (23) associated to the at least one electrical motor (20) by coolant conduits extending out of the front side of the mill roll (2) to the exterior.