Work vehicle with traction gearbox cooling

摘要

A work vehicle equipped with a main engine, a main engine gearbox and a main engine cooling circuit for circulating an engine coolant, the cooling circuit comprising at least one sub-portion comprising a radiator for heating the driver's cabin of the work vehicle. A heat exchanger is configured for heat exchange between said engine coolant and a lubricant flowing in a circuit into and out of a gearbox other than the engine gearbox. This latter gearbox can be the traction gearbox driven by a hydrostatic motor that is in turn powered by main-engine driven pump. The traction gearbox oil is then cooled by the engine coolant when the temperature difference between the engine coolant and the traction gearbox oil is higher than when the work vehicle is in active operation in the field.

主权项

1. A work vehicle comprising
a driver's cabin; a main engine and main engine gearbox; a secondary gearbox other than the main engine gearbox, said secondary gearbox comprising a lubricant; a main engine cooling circuit for circulating an engine coolant, said main engine cooling circuit comprising at least one sub-portion in which the engine coolant flow, the sub-portion comprising a radiator for heating the driver's cabin; a cooling circuit in which the lubricant of the secondary gearbox flows; and a heat exchanger configured for heat exchange between the engine coolant and the lubricant of the secondary gearbox flowing in the lubricant cooling circuit, the heat exchanger being configured to receive at least a portion of the engine coolant flowing in the sub-portion of the main engine cooling circuit and to transfer heat from the lubricant of the secondary gearbox flowing in the lubricant cooling circuit to the at least portion of the engine coolant flowing in the sub-portion of the main engine cooling circuit.