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 pu
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.
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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, where
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, andsaid 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. 2. The gearbox according to claim 1, comprising an electro-hydraulic system including: a high-pressure section, of which said first hydraulic pump and said electro-hydraulic actuation unit form part; anda low-pressure section, of which said second hydraulic pump forms part. 3. The gearbox according to claim 2, wherein said gearbox has a clutch assembly including a first clutch and a second clutch, and includes a first primary shaft and a second primary shaft arranged coaxially and a first secondary shaft and a second secondary shaft, parallel to said first and second primary shafts, each primary shaft being associated to a corresponding clutch and carrying respective gear wheels meshing with corresponding gear wheels of said first and second secondary shafts for defining said forward-gear and reverse-gear ratios. 4. The gearbox according to claim 3, wherein said first and second primary shafts are hollow, wherein said first primary shaft houses within it said second primary shaft, and wherein said second primary shaft houses within it a transmission rod connected in rotation to the engine of a motor vehicle on which said gearbox is installed and connected in rotation to a rotor of said second hydraulic pump for the transmission of the motion from said engine to said second hydraulic pump. 5. The gearbox according to claim 4, wherein said second hydraulic pump is of the gear type and includes said rotor as driving rotor and a further rotor as driven rotor. 6. The gearbox according to claim 3, wherein said clutch assembly comprises a first wet multidisc clutch and a second wet multidisc clutch mounted coaxially, wherein said first multidisc clutch is associated to said first primary shaft and is housed within said second multidisc clutch, said second multidisc clutch being in turn associated to said second primary shaft, each of the multidisc clutches having a respective drum connected in rotation to a rotary distributor rotatably mounted on said first primary shaft. 7. The gearbox according to claim 6, wherein the flow of hydraulic fluid processed by said first pump is exploited in part for the operations of selection and engagement of the gears of said gearbox via said electro-hydraulic actuation unit and in part for actuation of the clutches through the lines and the rotary distributor. 8. The gearbox according to claim 6, wherein the flow of fluid processed by said second pump is exploited in part for lubrication of said gearbox, in part for lubrication and cooling of the clutches, and in part is transferred to said first intake environment. 9. The gearbox according to claim 8, wherein the portion of flow processed by said second hydraulic pump that is exploited for lubrication and cooling of the clutches is delivered through an inlet port located up against said rotary distributor. 10. The gearbox according to claim 6, wherein said rotary distributor includes a plurality of sets of holes replicated circumferentially thereon and wherein each set includes: a first radial hole and a second radial hole;a first axial channel and a second axial channel in fluid communication with said first radial hole and said second radial hole, respectively; anda third radial hole and a fourth radial hole in fluid communication with said first and second axial channels, respectively. 11. The gearbox according to claim 10, wherein the third and fourth radial holes of each of said sets are in fluid communication with a respective pressurized fluid chamber of an actuator of a corresponding one of said second clutch and said first clutch. 12. The gearbox according to claim 11, wherein the portion of flow processed by said first hydraulic pump that is exploited for actuation of the clutches goes to each set of said first and second radial holes through a first hydraulic actuation line and a second hydraulic actuation line.
Grosspietsch,Wolfgang; Kundermann,Wolfgang; Stampf,Volker; Ebert,Angelika; Reisser,Wolfgang, Double or multiple disk coupling device and disk arrangement therefor.
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