Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
  • F16H61/0021—Generation or control of line pressure
  • F16H61/0025—Supply of control fluid; Pumps therefore

Definitions

• the invention relates to the gearboxes of a motor vehicle with parallel shafts and an oil multidisc clutch.
• the invention particularly relates to gearboxes equipped with an oil pump intended for clutching.
• a multi-disc oil clutch requires a hydraulic pump to be driven mechanically even before the vehicle is in motion.
• pressurized oil is required to control the clutch. actuate the latter to move from the free state to the engaged state
• the oil pump supplies a hydraulic distribution member. Lubrication of the discs themselves is also necessary and useful when the discs are at rest, especially when using a controlled slip technique.
• gearboxes are equipped with two multi-fluid clutches.
• the oil flow required for a gearbox with multi-fluid oil clutches is therefore large enough that there is a problem of bulk of the oil pump inside the gearbox.
• the invention proposes a gearbox equipped with an oil pump capable of a flow rate sufficient to feed multi-plate clutches which is easy to implement inside a vehicle, in particular with regard to the implantation in a vehicle.
• the axis of the engine crankshaft According to one embodiment, the motor vehicle engine gearbox is provided with parallel shafts and comprises at least one oil-filled clutch and an oil pump for controlling the clutch.
• the oil pump is mechanically driven by a hub, whose axis is substantially perpendicular to the shafts of the gearbox
• the oil pump is of generally flat shape, and the axis of the drive hub of said oil pump is substantially perpendicular to said flat shape.
• a flat shape it is meant that the pump has a volume of space of which the dimension in a thickness direction is smaller than the two dimensions in two other perpendicular directions
• the clutch is provided with a clutch bell connected to the engine.
• the drive hub of the oil pump is connected by a kinematic chain to the clutch housing
• the driveline can have a 90 degree bevel gearbox
• the kinematic chain comprises a first toothed wheel integral with the clutch bell, a subassembly provided with a second toothed wheel meshing with the first toothed wheel and a first conical gear, the subassembly being free in rotation about a fixed axis with respect to a clutch cartel, the driving hub of the pump being equipped with a second conical gear meshing with the first bevel gear
• the oil pump is immersed in the lower part of the a housing containing the clutch so as to aspne the dripping oil of the clutch
• the pump comprises two flat rotors side by side and parallel axes.
• the pump is generally rectangular in shape, arranged along the shafts of the gearbox, close to a hydraulic distribution member. The oil pump and the hydraulic distribution unit can be accessed by the same side hatch
• the gearbox has two primary shafts alternately connected to two oil clutches and three other shafts provided with pinions of which only one meshes with a differential ring driving the wheels of the vehicle.
• FIG. 1 is a schematic representation in side section of the gearbox
• FIG 2 is a schematic representation in a transverse plane of the gearbox.
• the gearbox 1 comprises a clutch 2 connected to a drive shaft 3 of the gearbox 1 in the axis of the crankshaft of the engine, not shown.
• the gearbox 1 also comprises a primary shaft.
• the part of the gearbox 1 comprising the clutch 2 is contained in a clutch housing.
• gearbox shown in Figure 2 are contained in a housing of the mechanisms 6
• a clutch cover 7 is traversed by the drive shaft 3 of the gearbox 1 and is provided with a seal 8 ensuring the seal between the clutch couveicle 7 and the drive shaft 3 of the gearbox 1
• a hydraulic distribution member 9 is located in the lower part of the gearbox 1 and communicates with the clutch housing 5
• the hydraulic distribution member 9 is supplied with oil under pressure by an oil pump 10 and distributes when necessary pressurized oil to such or such part of the clutch 2
• the clutch 2 comprises a clutch bell 11 occupying the bulk of the external dimensions of the clutch 2.
• the clutch bell 11 is driven in continuous rotation by the drive shaft 3 of the clutch box 11. 1
• Within the clutch housing 11 are a plurality of disks, not shown, rotatably connected to the clutch housing 11, in register with a plurality of disks connected in rotation with the primary shaft 4
• a first toothed wheel 12 is fixed on the clutch bell 11.
• the rotation of the first toothed wheel 12 is directly linked to the rotation of the motor of the vehicle by the drive shaft 3 of the gearbox 1, which the clutch 2 is engaged or not
• a sub-assembly 13, free to rotate about an axis hé to the clutch housing not shown, comprises a second gear 14 meshing with the first gear 12 and a first bevel gear 15
• the drive hub 16 of the oil pump 10 is provided with a second bevel gear 17 meshing with the first bevel gear 15
• the first bevel gear 15 and the second bevel gear 17 form a bevel gear 18
• the axle 16a of The driving hub 16 of the oil pump 10 is substantially perpendicular to the common direction of the shafts of the gearbox and the crankshaft of the engine.
• the oil pump 10 comprises two rotors 19 and 20.
• the two rotors 19 and 20 have conjugate gear shapes not shown so that the oil in which the rotors rotates is compressed in the part where the conjugate toothings go towards their meshing position and is sucked into the part where the teeth move away from their meshing position.
• oil 10 is of a substantially rectangular and flat general shape
• the oil pump 10 is parallelepiped with a thickness for example three times smaller than the width
• the thickness of the pump 10 corresponds to the thickness of the rotors 19, 20
• the width of the pump 10, visible in Figure 2 corresponds to the diameter of the rotors 19, 20 and the length, visible in Figure 1, corresponds to the sum of the diameters of the two rotors 19 and 20
• the axis 16a of the drive hub 16 is perpendicular to the flat rectangular shape and the shafts of the gearbox 1
• the length of the primary shaft 4, as well as the center distance between the different parallel shafts of the gearbox 1 are directly imposed by the architecture of the gearbox 1 Clutter due to the length and the width
• the oil pump 10 is not disadvantageous with respect to the size of the gearbox mechanisms.
• the thickness of the oil pump 10 is particularly reduced so as not to cause excessive excess space in a box. 1 comprising both the mechanisms 6 and the oil pump 10
• the clutch housing 5 shown in Figure 1 has a partition 21 separating the part of the gearbox 1 comprising the mechanisms 6, the part of the gearbox 1 comprising the clutch 2, the hydraulic distribution member 9 and the oil pump 10
• the mechanisms 6 of the gearbox 1 can be lubricated with an oil different from that used for the clutch 2
• FIG. 2 will now describe the transverse distribution of various members of the gearbox 1.
• the clutch bell 11 drives two concentric clutches independent of one another and connected alternately to two shafts. coaxial primaries 4a and 4b.
• the gearbox 1 comprises two secondary shafts 22 and 23 each provided with several synchronization systems, not shown. The synchronization systems make it possible to secure with the corresponding secondary shaft 22 or 23, pinions rotatably mounted on said secondary shaft 22 or 23. and meshing with teeth of the primary shafts 4a or 4b
• the secondary shaft 22 is provided with a pinion meshing with a ring 24 of differential of the vehicle
• the secondary shaft 23 is not in direct meshing relationship with the differential ring 24
• the reports of the box speeds established by means of synchronization systems arranged on the secondary shaft 23, have a kinematic chain comprising deflection gears mounted either on an intermediate shaft 25, or on one of the primary shafts 4a or 4b so as to drive the pinion
• the gearbox 1 has secondary shafts 22 and 23, as well as an intermediate shaft 25 in the lower part of the gearbox 1.
• the oil pump 10 has an oil inlet 26 located in the lower part of the gearbox so that the oil flowing inside the clutch housing 5 can be recovered by the oil inlet. 26.
• the clutch housing 5 has a lateral opening on the side of the hydraulic distribution member 9 closed by a side hatch 5a
• the side hatch 5a allows simultaneous access to the hydraulic distribution member 9 and to the oil pump 10 in order to be able to maintain one and the other
• the angle of the bevel gears 15 and 17 is 45 ° so that the bevel gear, illustrated in the figure, is substantially 90 °
• the angle that the axis 16a of the drive hub 16 of the oil pump 10 with the parallel shafts of the gearbox may be slightly different from 90 ° so that the outer surface 10a of the oil pump 10 can match the available foimes of the housing of the mechanisms 6 in order to optimizes the overall size of the gearbox 1

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• 2005
  • 2005-05-18 FR FR0504992A patent/FR2885980B1/fr not_active Expired - Fee Related
• 2006
  • 2006-04-24 EP EP06743833A patent/EP1888944A2/de not_active Withdrawn
  • 2006-04-24 WO PCT/FR2006/050376 patent/WO2006123079A2/fr not_active Application Discontinuation

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