Self-propelled surface milling machine with electrical mill roll drive

US9080293B2 · kind B2 · utility

Assignee

• Liebherr-Components Biberach GmbH · DE

Inventors

• Klaus Graner · Ahlen, DE
• Johann Lis · Riedlingen, DE

Key dates

• Filing date: Apr 11, 2011
• Grant date: Jul 14, 2015
• Expiry date: Jul 6, 2033

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21C31/02
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

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.