Search

EP-4735772-A1 - MOTORIZED MODULE AND HYBRID TRANSMISSION ASSEMBLY OF A VEHICLE

EP4735772A1EP 4735772 A1EP4735772 A1EP 4735772A1EP-4735772-A1

Abstract

The invention relates to a motorized module (60) for driving and slowing down an intermediate shaft of a hybrid transmission assembly, said motorized module comprising: - at least one reversible electric machine (61) mounted on a protective casing (62), - a connection device (70) designed to connect the at least one reversible electric machine (61) to the intermediate shaft (26), and -a speed reducer (100) arranged kinematically between the at least one reversible electric machine and the connection device (70), the connection device (70) comprising: - a connection shaft (71) able to rotate with respect to the protective casing about a main axis (X), - a dog clutch (80) supported by the connection shaft (71) and designed to rotationally lock the connection shaft with the protective casing in a first operating state or to rotationally couple the connection shaft with an output pinion (108) of the speed reducer (100) in a second operating state.

Inventors

  • VASSIEUX, LOIC
  • LHEUREUX, DOMINIQUE
  • LEMAIRE, Thibault

Assignees

  • Valeo Embrayages

Dates

Publication Date
20260506
Application Date
20240513

Claims (16)

  1. 1. Motorized module (60) for driving and slowing down an intermediate shaft of a hybrid transmission assembly, said motorized module comprising: at least one reversible electric machine (61) attached to a protective casing (62), a connection device (70) arranged to connect the at least one reversible electric machine (61) to the intermediate shaft (26), and a speed reducer (100) arranged kinematically between the at least one reversible electric machine and the connection device (70), the connection device (70) comprising: - a connection shaft (71) movable in rotation relative to the protective casing (62) along a main axis (X), - a dog clutch (80) supported by the connecting shaft and arranged to rotationally lock the connecting shaft (71) with the protective casing in a first operating state or rotationally couple the connecting shaft (71) with an output pinion (108) of the speed reducer (100) in a second operating state, and - a wet clutch (90) of the multi-disc type kinematically linked to the connecting shaft (71) comprising: - a torque input disc carrier (92) partially supporting a multi-disc assembly (91) and arranged to be rotatably connected to the intermediate shaft (26), and - an actuation system (95) for configuring the wet clutch (90) in either an engaged position, a disengaged position, or a torque-slip position, and wherein the wet clutch (90) configured in its engaged position couples the connecting shaft (71) to the intermediate shaft (26) when the dog clutch (80) is in the second operating state, or the wet clutch (90) configured in its torque sliding position slows the intermediate shaft (26) relative to the protective housing (62) when the dog clutch (80) is in the first operating state.
  2. 2. Motorized module (60) according to claim 1, in which the multi-disc assembly (91) of the wet clutch is pressed axially by an actuating piston (96) of annular shape, coaxial with the connection shaft (71), the actuating piston (96) being guided axially within a pressure chamber (97) formed directly or indirectly in the protective casing (62).
  3. 3. Motorized module (60) according to claim 1 or 2, in which the dog clutch (80) comprises a sliding dog clutch sleeve (82) mounted to slide axially on the connection shaft (71) and which comprises internal axial splines (83) adapted to mesh with external axial splines (71a) of the connection shaft (71).
  4. 4. Motorized module (60) according to the preceding claim, in which the sliding sleeve (82) for dog clutching has a substantially cylindrical shape around the main axis (X), a first axial end (84) of the sliding sleeve is shaped into a first series of sliding splines (84a) capable of meshing with the protective casing (62) and a second axial end (85) of the sliding sleeve is shaped into a second series of sliding splines (85a) capable of meshing with the output pinion (108) of the speed reducer (100).
  5. 5. Motorized module (60) according to claim 4, in which the output pinion (108) of the speed reducer (100) comprises a series of axial dog teeth (108a) oriented radially outwards and arranged to cooperate with the second series of sliding gear splines (85a).
  6. 6. Motorized module (60) according to claim 4 or 5, in which the protective casing (62) comprises a series of teeth (62a) carried by a crown (63) and arranged to cooperate with the first series of sliding gear splines (84a), said crown (63) is carried or attached to an inner face of the protective casing (62).
  7. 7. Motorized module (60) according to one of claims 4 to 6, in which the first series of sliding grooves (84a) and the second series of sliding grooves (85a) are contiguous and axially aligned to form a single set of internal axial grooves (83) of the sliding sleeve (82).
  8. 8. Motorized module (60) according to one of the preceding claims, in which the multi-disc type wet clutch (90) comprises a torque output disc carrier (93) linked in rotation with the connection shaft (71) by spline, by shrink fitting or by screwed assembly.
  9. 9. Motorized module (60) according to the preceding claim, in which the wet clutch (90) of multi-disc type comprises a multi-disc assembly (91) consisting of a first set of discs (91a) engaged with splines of the torque input disc carrier (92), and a second set of discs (91b) engaged with splines of the torque output disc carrier (93).
  10. 10. Motorized module (60) according to one of the preceding claims, in which a portion (62b) of the protective cover (62) is interposed axially between the wet clutch (90) and the dog clutch (80), the portion being for example a wall made from the same material as the protective cover or a support plate attached to the protective cover (62).
  11. 11. Motorized module (60) according to one of the preceding claims, in which the speed reducer (100) comprises: - a drive shaft (101) supporting drive toothed wheels (Z2, Z4, Z6) capable of being driven by the output shaft of the reversible electric machine; - a complementary shaft (102) capable of being driven by complementary toothed wheels (Z3, Z5, Z7), each drive toothed wheel being kinematically linked to a corresponding complementary toothed wheel so as to form a pair of gears; and - the output pinion (108) of the speed reducer kinematically linked with the complementary shaft; in which a coupling device (120), arranged between the drive toothed wheels (Z 4, Z6) and the complementary toothed wheels (Z3, Z5), selects a first pair of gears (Z5, Z6) to obtain a first reduction ratio (R1) or a second pair of gears (Z3, Z4) to obtain a second reduction ratio (R2) from a neutral position.
  12. 12. Hybrid transmission assembly (1) for driving a vehicle, comprising: o a dry-operating clutch mechanism (20) intended to be driven by a main engine (14) of the vehicle; o a friction clutch disc (21) with a primary rotation axis (XI) capable of being driven by the main engine depending on the engaged or disengaged operating position of the clutch mechanism; o a gearbox (18) comprising: ■ one or more primary toothed wheels (38, 40) driven in rotation by the friction clutch disc along the primary axis of rotation (XI), ■ a secondary shaft (16) intended to drive a set of one or more drive wheels of the vehicle, ■ several secondary gear wheels (42, 44, 46) capable of being coupled to the secondary shaft (16), ■ an intermediate shaft (26) to which intermediate gear wheels (28, 30, 32, 34, 36) are rotationally secured, the primary gear wheel(s) (38, 40) and the secondary gear wheels (42, 44, 46) each meshing permanently with a corresponding gear wheel among the intermediate gear wheels (28, 30, 32, 34, 36), and o the motorized module (60) according to any one of the preceding claims in which the torque input disc holder (92) is attached to the intermediate shaft (26) coaxially, and in which the at least one reversible electric machine (61) rotates the intermediate shaft (26) when the wet clutch (90) is configured in its engaged position and when the dog clutch (80) is in the second operating state.
  13. 13. Hybrid transmission assembly (1) according to the preceding claim, wherein the speed reducer (100) comprises a first gear train connecting the reversible electric machine (61) to the output pinion (108) via a first reduction ratio (RI) by actuating a coupling device (120) according to a first position and a second gear train connecting the reversible electric machine (61) to the output pinion (108) via a second reduction ratio (R2) by actuating the coupling device (120) according to a second position.
  14. 14. Hybrid transmission assembly (1) according to claim 13, wherein the second reduction ratio (R2) of the second gear train is between 8 and 12 in order to allow the starting of the main engine by the torque supplied by the reversible electric machine (61) when the dry-operating clutch mechanism (20) is in the combined engaged operating position with the wet clutch (90) configured in its engaged position and the dog clutch (80) being in the second operating state.
  15. 15. Hybrid transmission assembly (1) according to claim 13 or 14, wherein the first reduction ratio (RI) of the first gear train is between 4 and 6 in order to allow the synchronization of one of the secondary gears (42, 44, 46) with the secondary shaft (16) when the dry operating clutch mechanism (20) is in the disengaged operating position combined with the wet clutch (90) configured in its engaged position and the dog clutch (80) being in the second operating state. 31
  16. 16. Hybrid transmission assembly (1) according to one of claims 12 to 15, in which a power take-off member (65) is connected in rotation to the output pinion (108) of the speed reducer (100), the power take-off member (65) being coaxial with the connection shaft (71).

Description

DESCRIPTION TITLE: MOTOR MODULE AND HYBRID TRANSMISSION ASSEMBLY OF A VEHICLE TECHNICAL FIELD OF THE INVENTION [0001] The invention relates to a hybrid transmission assembly intended to be positioned between an engine, for example a thermal engine, and a set of one or more drive wheels of a vehicle. It relates in particular, although not exclusively, to such an assembly intended to equip a heavy goods vehicle, that is to say a road vehicle of more than 3.5 tonnes, in particular a road tractor, or a carrier. The invention also relates to a motorized module capable of being integrated within the hybrid transmission assembly. STATE OF PRIOR ART [0002] Vehicle transmission assemblies of the gearbox type are known, comprising a primary shaft intended to be driven by a thermal engine of the vehicle, a secondary shaft intended to drive the driving wheels of the vehicle and an intermediate shaft capable of being coupled to the output shaft and to the input shaft by gear trains corresponding to different speed ratios. [0003] Document EP1592590 A1 teaches using a gearbox brake coupled to the intermediate shaft of the gearbox to brake the intermediate shaft during transient gear ratio change phases, which makes it possible to promote synchronization of the gearbox and thus reduce the duration of the transient gear ratio change phases. [0004] Document DE 102005043703 A1 discloses a reversible electric machine which is permanently coupled to the intermediate shaft of a transmission assembly. The reversible electric machine is thus capable of operating in current generator mode to decrease the speed of the intermediate shaft or in motor mode to increase the speed of the intermediate shaft during transient gear change phases in order to promote synchronization of the gearbox. In this document, the electric machine reversible is always linked to the intermediate shaft and thus generates a drag torque increasing the fuel consumption of the main engine. In addition, in the event of a malfunction of the reversible electric machine or when the battery has reached its maximum charge so that using the reversible electric machine to brake the intermediate shaft would risk damaging it, it is then no longer possible to brake the intermediate shaft of the gearbox during transient gear change phases, which poses safety problems in particular. STATEMENT OF THE INVENTION [0005] An idea underlying the invention is to propose a motorized module for driving and slowing down an intermediate shaft of a hybrid transmission assembly which makes it possible to overcome the drawbacks of the state of the art by allowing the use of a reversible electric machine to synchronize the gear changes of the gearbox without increasing the consumption of the main engine or impairing the safety of the vehicle. [0006] To do this, according to a first aspect of the invention, a motorized module is proposed for driving and slowing down an intermediate shaft of a hybrid transmission assembly, said motorized module comprising: - at least one reversible electrical machine attached to a protective casing, - a connection device arranged to connect the at least one reversible electrical machine to the intermediate shaft, and - a speed reducer arranged kinematically between the at least one reversible electrical machine and the connection device, the connection device comprising: - a movable connection shaft rotating relative to the protective casing along a main axis X, - a dog clutch supported by the connecting shaft and arranged to lock the connecting shaft in rotation with the protective casing in a first operating state or to couple the connecting shaft in rotation with an output pinion of the speed reducer in a second operating state, and - a multi-disc wet clutch kinematically linked to the connecting shaft comprising: - a torque input disc carrier partially supporting a multi-disc assembly and arranged to be rotatably connected to the intermediate shaft, and - an actuation system for configuring the wet clutch in either an engaged position, a disengaged position, or a torque slip position, and wherein the wet clutch configured in its engaged position couples the connecting shaft to the intermediate shaft when the dog clutch is in the second operating state, or the wet clutch configured in its torque slip position slows the intermediate shaft relative to the protective housing when the dog clutch is in the first operating state. [0007] The interposition of such a connection device between the reversible electric machine and the intermediate shaft makes it possible to envisage operating modes as described in the prior art when the wet clutch is engaged, and additional operating modes in which the reversible electric machine can be uncoupled, either because it is not necessary for the operation of the hybrid transmission assembly, or because it is used for other purposes, for example for driving another rotating member. Furthermore, the decoupling of the elect