Gearbox for a motor vehicle

摘要

A gearbox for a motor vehicle including a plurality of forward gear ratios and at least one reverse gear ratio. The gearbox including an electro-hydraulic actuation unit configured for selection and engagement of the gear ratios. The gearbox comprises a first hydraulic pump and a second hydraulic pump. The first hydraulic pump is driven in rotation by an electric motor and is configured for supplying hydraulic fluid taken in from a first intake environment to said electro-hydraulic actuation unit. The second hydraulic pump is driven in rotation by an engine of said motor vehicle and is configured for supplying hydraulic fluid taken in from a second intake environment to said gearbox, for lubrication thereof, and to said first intake environment.

主权项

1. A gearbox for a motor vehicle including:
a plurality of forward gear ratios and at least one reverse gear ratio, an electro-hydraulic actuation unit configured for the selection and the engagement of said gear ratios, the gearbox comprising a first hydraulic pump and a second hydraulic pump, wherein:
the first hydraulic pump is driven in rotation by an electric motor and is configured for supplying hydraulic fluid taken in from a first intake environment to said electro-hydraulic actuation unit;the second hydraulic pump is driven in rotation by an engine of said motor vehicle, and said second hydraulic pump configured for supplying hydraulic fluid taken in from a second intake environment to said gearbox, for lubrication thereof, and to said first intake environment; said first intake environment being a drainage volume of said electro-hydraulic actuation unit; said second intake environment being an oil sump fixed to a casing of said gearbox; wherein a delivery of the second hydraulic pump leads onto a node wherefrom three distinct hydraulic lines depart including:
a first hydraulic line, whereon a pressure-relief valve is inserted and which returns to the oil sump;a second hydraulic line leading to shafts of the gearbox for the lubrication thereof and for lubrication of the gears of the gearbox; anda third hydraulic line interposed on which is a pressure-reducer solenoid valve, which leads to said first intake environment.