EP4193074A1 - Torque disconnect clutch for a hybrid transmission - Google Patents
Torque disconnect clutch for a hybrid transmissionInfo
- Publication number
- EP4193074A1 EP4193074A1 EP21734876.2A EP21734876A EP4193074A1 EP 4193074 A1 EP4193074 A1 EP 4193074A1 EP 21734876 A EP21734876 A EP 21734876A EP 4193074 A1 EP4193074 A1 EP 4193074A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- torque
- clutch
- pressure plate
- intermediate pressure
- output member
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 54
- 239000002184 metal Substances 0.000 claims abstract description 84
- 229910052751 metal Inorganic materials 0.000 claims abstract description 84
- 238000006243 chemical reaction Methods 0.000 claims description 44
- 210000002105 tongue Anatomy 0.000 claims description 40
- 238000000034 method Methods 0.000 claims description 12
- 238000003825 pressing Methods 0.000 claims description 4
- 230000000284 resting effect Effects 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 2
- 230000007246 mechanism Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 210000000056 organ Anatomy 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D13/00—Friction clutches
- F16D13/58—Details
- F16D13/75—Features relating to adjustment, e.g. slack adjusters
- F16D13/757—Features relating to adjustment, e.g. slack adjusters the adjusting device being located on or inside the clutch cover, e.g. acting on the diaphragm or on the pressure plate
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D13/00—Friction clutches
- F16D13/22—Friction clutches with axially-movable clutching members
- F16D13/38—Friction clutches with axially-movable clutching members with flat clutching surfaces, e.g. discs
- F16D13/52—Clutches with multiple lamellae ; Clutches in which three or more axially moveable members are fixed alternately to the shafts to be coupled and are pressed from one side towards an axially-located member
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D25/00—Fluid-actuated clutches
- F16D25/06—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch
- F16D25/062—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces
- F16D25/063—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces with clutch members exclusively moving axially
- F16D25/0635—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces with clutch members exclusively moving axially with flat friction surfaces, e.g. discs
- F16D25/0638—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces with clutch members exclusively moving axially with flat friction surfaces, e.g. discs with more than two discs, e.g. multiple lamellae
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D13/00—Friction clutches
- F16D13/58—Details
- F16D13/70—Pressure members, e.g. pressure plates, for clutch-plates or lamellae; Guiding arrangements for pressure members
- F16D2013/706—Pressure members, e.g. pressure plates, for clutch-plates or lamellae; Guiding arrangements for pressure members the axially movable pressure plate is supported by leaf springs
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
Definitions
- the present invention relates to a torque cut-off clutch, otherwise called a KO clutch, in particular for a motor vehicle hybrid transmission, the motor vehicle possibly also being a so-called industrial vehicle, the latter being for example a heavy goods vehicle, a public transport vehicle, or an agricultural vehicle.
- a torque cut-off clutch otherwise called a KO clutch
- the motor vehicle possibly also being a so-called industrial vehicle, the latter being for example a heavy goods vehicle, a public transport vehicle, or an agricultural vehicle.
- the transmission In the context of a motor vehicle, the transmission generally comprises a heat engine, a gearbox and a clutch mechanism connecting the heat engine to the gearbox.
- an electric motor is coupled to the transmission, so that the vehicle operates sometimes with the combustion engine, sometimes with the electric motor or sometimes simultaneously with the two electric and combustion engines.
- This alternation of operation of the electric and thermal motors within the hybrid transmission involves the use of a torque cut-off clutch arranged between the two motors.
- Patent application FR2830589 A1 describes a hybrid transmission comprising a heat engine, an electric motor and a gearbox.
- a torque cut-off clutch is inserted in the drive torque flow between the internal combustion engine and the gearbox. This clutch provides alternating torque transmission between the two engines.
- the torque cut-off clutch is a single-disc type operating in a dry environment. This torque cut-off clutch is not suitable for applications requiring the transmission of a high engine torque and/or resistance to high thermal stresses.
- the torque cut-off clutch described in patent application US2006/0289209 A1 responds in part to the problem posed above.
- This clutch comprises a multi-disc assembly disposed between the heat engine and the rotor of the rotating electrical machine.
- this clutch capable of transmitting a high torque is not really optimized in terms of energy efficiency given that the multi-disc assembly does not does not include a device for separating the pressure plates from the friction discs.
- poor spacing of the friction discs can generate unwanted additional friction.
- the lack of separation of the friction discs creates a resistive torque which translates into an additional CO2 emission produced by the vehicle.
- the object of the present invention is to solve at least a large part of the above problems and to lead in addition to other advantages by proposing a new torque cut-off clutch.
- An object of the invention is to increase the torque transmissibility capacity of such a torque cut-off clutch while ensuring good release of the friction discs when the clutch is in the disengaged position.
- Another object of the invention is to preserve the electromagnetic performance of the electric motor placed in the hybrid transmission.
- Another object of the invention is to improve the energy performance of the hybrid transmission using such a torque cut-off clutch, in particular by reducing friction losses within said clutch.
- the invention proposes a torque cut-off clutch for a motor vehicle hybrid transmission, comprising:
- a torque output member arranged to be connected to a rotating electrical machine rotor, an intermediate pressure plate axially movable relative to the torque output member and a main pressure plate axially movable relative to the organ torque output, the torque output member and the pressure plates each comprising at least one friction face arranged axially opposite the friction discs;
- the torque output member and the main pressure plate are interconnected by means of a first series of metal tongues distributed angularly on their peripheries, each of the metal tongues being hinged at its ends between the torque output and the main pressure plate so as to move the main pressure plate away from the torque output member when the clutch is in the disengaged position;
- the torque cut-off clutch being remarkable in that means adjustment are provided for adjusting the axial position of the end of the support elements in contact with the metal tongues, the clutch being in the engaged position.
- This torque cut-off clutch has the advantage of greatly increasing the number of faces by using two pressure plates and friction discs and thus increasing the drive torque transmissible within the cut-off clutch.
- the outside diameter of the torque cut-off clutch can be reduced.
- the use of metal tabs for the connection of the main pressure plate improves the release of the friction discs when the clutch is in the disengaged position.
- the metal tabs can be optimized in terms of buckling in the circumferential direction in order to transmit more torque along the X axis.
- the metal tabs can be optimized in terms of stiffness in order to more easily separate the pressure plates between them.
- the metal tongues are bent and accumulate energy which will be restored during the following disengagement phase.
- the gap created between the pressure plates and the torque output member by the metal tongues is sufficient to avoid any untimely friction during the disengagement phases.
- the metal tabs Thanks to the rigidly fixed ends, the metal tabs have a high rigidity in the circumferential direction. When the pressure plate has a high temperature, the metal tabs transfer the heat by coming from the hot friction faces to another component of the cut-off clutch whose temperature is lower.
- adjustment means makes it possible to position the end of each support element axially with great precision on the corresponding metal tongue, so that the defects of parallelism at the level of the friction face of the plate of intermediate pressure are reduced.
- the intermediate pressure plate moves parallel to the friction discs, thus avoiding any untimely friction during the disengagement phases.
- the axial position of the end of the support elements is adjusted when the clutch is in the engaged position.
- the friction discs comprise friction linings operating in a dry environment. It is no longer necessary to provide a specific coolant circuit for the torque cut-off clutch.
- each support element may comprise a cylindrical rod, one end of which is in contact with the corresponding metal tongue.
- each support element may comprise a cylindrical rod, one end of which is in contact with the corresponding metal tongue.
- each support element may comprise a cylindrical surface fitted into a portion of the intermediate pressure plate for adjusting the axial position, each of the support elements being inserted into a bore of parallel axis to the X axis formed in the intermediate pressure plate.
- each support element may comprise on its cylindrical part an external thread screwed into a portion of the intermediate pressure plate for adjusting the axial position, each of the support elements being screwed into a thread with an axis parallel to the X axis formed in the intermediate pressure plate.
- locking means may be provided for locking each support element in the axial position after adjusting the axial position of the end. Locking the axial position of the support elements after adjustment ensures proper operation of the torque cut-off clutch over the entire service life of the hybrid transmission.
- the torque output member and the intermediate pressure plate can be connected together by means of a second series of metal tongues distributed angularly on their peripheries, each of the metal tongues being hinged at its ends between the torque output member and the intermediate pressure plate so as to separate the intermediate pressure plate from the torque output member when the clutch is in the disengaged position, the metal tongues of the intermediate pressure plate being offset angularly relative to the metal tabs of the main pressure plate.
- the angular offset of the metal tabs of the first series compared to those of the second series makes it easier to access the adjustment means.
- the torque output member may comprise bores distributed angularly around the X axis whose axes parallel to the X axis are substantially coinciding with the axes of the cylindrical rods of each of the support elements . In this way, it is possible to access the adjustment means more easily.
- the torque output member may comprise a reaction plate and an external torque transmission crown integral in rotation with the reaction plate, said external crown being arranged to be connected to the rotor of the rotating electrical machine .
- the outer torque transmission crown may comprise an axial extension bearing covering the outer periphery of the pressure plates, the axial extending bearing being capable of receiving the rotor of the rotary electrical machine.
- the electric motor can be placed radially beyond the pressure plates, ideally in the same axial plane. This radial stacking is however of no consequence for the performance of the electric motor.
- the outer crown provides thermal protection between the heat emitted by the friction of the discs on the pressure plates and the rotor of the electric machine. The electromagnetic performance of the electric machine is thus preserved.
- the outer torque transmission ring may be formed directly in the reaction plate, said outer ring may comprise an axial extension bearing covering the outer periphery of the pressure plates, the axial extension bearing being capable of receiving the rotor of the rotating electrical machine.
- the reaction plate and the outer torque transmission crown form a closed circular enclosure
- the pressure plates of the torque cut-off clutch comprising heat exchange surfaces suitable for convection with the air contained in the interior volume of the closed circular enclosure.
- the temperature within the torque cut-off clutch is regulated.
- the lining dust emitted by the friction discs is contained inside the closed circular enclosure. The closed circular enclosure prevents the spread of friction lining dust at the level of the air gap of the rotating electrical machine. The efficiency of the hybrid transmission is thus preserved.
- the drive torque from a drive shaft enters through the torque input member located in the center of the clutch and exits through the axial extension bearing surface of the outer transmission crown of torque located radially outside the clutch.
- the driving torque is transmitted by components of the clutch having simplified shapes.
- the invention may have one or other of the characteristics described below combined with each other or taken independently of each other:
- each support element can be plastically deformed in the intermediate pressure plate for the blocking in axial position of the end of the support element.
- - locking screws can be inserted into threaded holes with an axis perpendicular to the X axis formed on the intermediate pressure plate, each locking screw being able to bear against the cylindrical rod of the support element to locking in axial position of the end of the support element.
- each locking nut can be screwed onto the external thread of the cylindrical part of each bearing element, each locking nut being tightened on a bearing surface of the intermediate pressure plate for the locking in axial position of the end of the supporting element.
- reaction plate can be made of cast iron.
- the intermediate pressure plate can be made of cast iron.
- the main pressure plate can be made of stamped sheet steel.
- the external torque transmission crown can be made of stamped sheet steel.
- the external torque transmission crown can be attached to the reaction plate.
- reaction plate can be inserted in the external torque transmission ring gear.
- the outer torque transmission crown may include holes for fixing with the rotor of the electric machine.
- the outer torque transmission crown and the reaction plate can be made of different materials. In this way, it is possible to create a thermal bridge between the two components so that the electromagnetic performance of the electrical machine is preserved.
- the torque input member may comprise an input hub and an axial extension bearing receiving an external torque transmission spline cooperating with an internal spline formed on the friction disc.
- the torque input member can be centered on the torque output member via a rolling member, for example a needle bearing or a ball bearing.
- the input hub may comprise a splined section extending axially towards the outside of the clutch and passing through the reaction plate through a central orifice.
- a first friction disc can be arranged axially between the reaction plate and the intermediate pressure plate, and a second friction disc can be arranged axially between the intermediate pressure plate and the main pressure plate.
- the intermediate pressure plate may be annular in shape and include lugs made from material from the outer periphery, each lug serving as a support for the metal tongues of the second series.
- the main pressure plate can be deformed annular and include tabs from material from the outer periphery, each tab serving as a support for the metal tongues of the first series.
- the metal tongues can be fixed rigidly on the legs of the pressure plates, by riveting, by welding or screwed assembly.
- the reaction plate can include studs for fixing the metal tabs, the studs being made from material or added.
- reaction plate fixing studs can be arranged radially beyond the friction face.
- the axial supports of the metal tongues on the reaction plate can be offset axially with respect to the supports of the metal tongues on the pressure plates. In this way, the metal tabs are bent and accumulate energy that can be released during the disengagement phase.
- the outer torque transmission crown may comprise a circular rim arranged at the end of the axial extension bearing surface, the circular rim comprising a bearing face capable of receiving the axial bearing of a rotor of a rotating electrical machine .
- the outer torque transmission crown may comprise a circular rim arranged at the end of the axial extension bearing surface, the circular rim comprising a bearing face capable of receiving the axial bearing of a transmission, for example an input element of a wet double clutch mechanism.
- the outer torque transmission crown may comprise a flange extending radially relative to the axis of rotation and a torque output hub intended to be connected to a transmission element, for example a clutch mechanism, a dual-clutch mechanism or a torque converter.
- the torque cut-off clutch can comprise a clutch actuator able to close the clutch during the clutch phases so that the drive torque can be transmitted from the torque input member to the torque output member, the clutch actuator resting on the main pressure plate with the aid of a force transmission member with transmission of the pressing force directly on the main pressure plate without gear reduction.
- the clutch actuator can be rotatable with the second pressure plate.
- the clutch actuator can be operated hydraulically or pneumatically.
- the torque cut-off clutch can be of the normally open type.
- the invention also relates, according to another of its aspects, to a hybrid transmission for a motor vehicle, comprising a heat engine, a rotating electrical machine concentric with the axis of rotation of the heat engine and a cut-off clutch torque incorporating all or part of the characteristics mentioned above, the torque input member being coupled in rotation with the heat engine and the torque output member being coupled in rotation with the rotor of the rotating electrical machine.
- This hybrid transmission has the advantage of reducing the axial bulk and improving the energy performance of the motor vehicle.
- the invention also relates to a method for adjusting the torque cut-off clutch partly incorporating the characteristics mentioned above, comprising the following steps:
- the method for adjusting the torque cut-off clutch may include the following additional step:
- the adjustment process is simplified and economical thanks to the presence of cylindrical rods assembled on the intermediate pressure plate.
- the adjustment process is carried out when the clutch is in the engaged position. Adjustment of the support elements can be done before mounting the external torque transmission ring gear on the reaction plate. It is therefore not necessary to drill tool passage holes in the outer ring to adjust the position of the end of each support element.
- the circular enclosure formed by the reaction plate and the external torque transmission crown remains closed.
- the invention also relates to another method for adjusting the torque cut-off clutch partly incorporating the characteristics mentioned above, comprising the following steps:
- this method of adjusting the torque cut-off clutch may include the following additional step:
- This adjustment method is also simplified and economical.
- FIG. 1 is a view in axial section of a hybrid transmission comprising a torque cut-off clutch according to a first mode of implementation of the invention
- FIG. 2 is an isometric view of the torque cut-off clutch according to the first mode of implementation of the invention of FIG. 1;
- FIG. 3 is a detail view of the torque cut-off clutch and the adjustment means according to the first mode of implementation of the invention of FIG. 1;
- FIG. 4 is a detail view of the torque cut-off clutch and adjustment means according to a second embodiment of the invention.
- FIG. 5 is a detail view of the torque cut-off clutch and adjustment means according to a third mode of implementation of the invention.
- FIGS 1 to 3 illustrate a first mode of implementation of a torque cut-off clutch 10.
- the torque cut-off clutch 10 is integrated into a hybrid transmission 1 motor vehicle.
- the hybrid transmission 1 comprises in particular a heat engine 2, an electric motor 50 concentric with the axis of rotation of the heat engine and the torque cut-off clutch 10 having the function of coupling and uncoupling the two motors during engagement and disengagement phases.
- the torque cut-off clutch is of the multi-disc type and comprises in particular a first friction disc 13a disposed axially between a torque output member 30 and an intermediate pressure plate 21, a second friction disc 13b disposed axially between the intermediate pressure 21 and a main pressure plate 22.
- the torque cut-off clutch is of the two-disc type. This torque-cutting clutch operates in a dry environment where airflow between the friction faces provides clutch cooling.
- the intermediate pressure plate 21 comprises two friction faces 211a, 211b arranged axially opposite the friction discs 13a, 13b.
- the main pressure plate 22 comprises a friction face 221 disposed axially opposite the friction disc 13b.
- the torque output member 30 comprises a reaction plate 31 and an external torque output crown 40 integral in rotation with the reaction plate.
- the outer crown is arranged to be connected to the rotor 51 of the rotating electrical machine 50.
- the reaction plate 31 comprises a friction face 32 arranged axially opposite the friction disc 13a.
- the outer crown 40 is attached to the reaction plate 31 via a riveted connection 33.
- the outer ring 40 may include an axial extension bearing 41 formed in one and the same piece with the reaction plate 31.
- the torque cut-off clutch 10 forms a unitary assembly which is supported in rotation on the hybrid transmission via a closure cover 4 and a housing 3 of the gearbox and organs bearing, ball bearing type.
- the closure cover 4 also supports the stator 52 of the electric machine 50.
- the closure cover 4 is attached to the casing 3 of the gearbox.
- the torque cut-off clutch 10 is connected to a drive veil 60 fixed integrally on the outer crown 40.
- the drive veil 60 provides the connection between a double wet clutch mechanism 61 of the gearbox and the torque cut-off clutch 10.
- the double wet clutch mechanism 61 is connected to the output of the torque cut-off clutch 10. This double wet clutch mechanism 61 is shown schematically and transmits the drive torque from the outer crown 40 of torque transmission to the concentric driven shafts A1, A2 of the gearbox. The dual clutch mechanism 61 is controlled to selectively couple drive torque to the first driven shaft A1 and the second driven shaft A2.
- the torque input member 11 comprises an input hub having a splined section extending axially outwards from the clutch and passing through the reaction plate 31 through a central orifice.
- the torque input member 11 also comprises an axial extension surface 12 receiving an external spline 121 for transmitting torque cooperating with an internal spline 14a, 14b formed on the friction discs 13a, 13b.
- Each friction disc comprises a metal support receiving friction linings.
- the metal support comprises an axial extension bearing receiving the internal spline 14a, 14b.
- the torque input member 11 is centered on the reaction plate 31 via a rolling member 15, of the needle bearing type.
- the torque cut-off clutch 10 has the main function of restarting the combustion engine.
- the restarting torque comes from the electric motor which is transmitted to the shaft of the heat engine by the closing of the torque cut-off clutch.
- the torque values transmitted are for example of the order of 50 to 150 Nm. This operation can be repeated a large number of times in a limited time, which produces a heating of the friction faces of the pressure plates of the clutch .
- the torque cut-off clutch 10 has the other main function of transmitting the drive torque from the internal combustion engine to the gearbox.
- the drive torque values transmitted are for example of the order of 250 to 500 Nm.
- the drive torque coming from the motor shaft 2 enters through the torque input member 11 located at the center of the clutch and spring by the outer crown 40 of torque transmission.
- the outer crown 40 comprises in particular a circular rim 42 arranged at the end of the axial extension surface, the circular rim 42 comprising bearing faces capable of receiving the axial bearing of the rotor 51 of the electric machine and of the veil training 60.
- the outer crown 40 includes fixing holes 43 formed on the circular flange 42.
- the assembly of the rotor 51 on the drive veil 60 is done by a screw assembly 53, the screws 53 passing through the fixing holes 43.
- This axial extension surface 41 covers the outer periphery of the pressure plates and forms, together with the friction face 32 of the reaction plate 31 and the drive web 60, a closed circular enclosure which surrounds the faces of friction of the multi-disc assembly.
- the closed circular enclosure prevents the spread of friction lining dust at the level of the air gap of the rotating electrical machine. The efficiency of the hybrid transmission 1 is thus preserved.
- the outer crown 40 also provides thermal protection between the heat emitted by the friction of the discs on the pressure plates and the rotor 51 of the electric machine.
- the pressure plates 21, 22 comprise heat exchange surfaces suitable for convection with the air contained in the internal volume of the closed circular enclosure.
- the opening and closing of the torque cut-off clutch 10 is ensured by a clutch actuator 70 movable in rotation with the main pressure plate 22.
- the clutch actuator 70 comprises a piston actuation housed in an annular chamber.
- the clutch actuator 70 bears directly on the main pressure plate 22 using a force transmission member 71.
- the force transmission member 71 is annular in shape and has great rigidity along the axis X.
- the force transmission member 71 rests in an annular groove 224 formed on one of the faces of the main pressure plate 22.
- the transmission of the pressing force takes place directly on the main pressure plate 22 without gearing down.
- the clutch actuator can be hydraulically or pneumatically controlled.
- the torque cut-off clutch 10 operates in a dry environment.
- the torque cut-off clutch 10 is of the normally open type and comprises a device for separating the pressure plates 21, 22 with respect to the improved torque output member 30.
- reaction plate 31 and the main pressure plate 22 are connected to each other by means of a first series of tabs metal 16 distributed angularly on their peripheries.
- Each of the metal tongues 16 is articulated at its ends between the reaction plate 31 and the main pressure plate 22.
- the metal tongues 16 of the first series are able to transmit the torque, to separate the main pressure plate from the torque output when the clutch is disengaged and to transmit heat from the friction face of the main pressure plate.
- the main pressure plate 22 is annular in shape and includes tabs 222 made from material from the outer periphery, each tab 222 serving as a support for the metal tabs 16.
- reaction plate 31 and the intermediate pressure plate 21 are connected to each other via a second series of metal tabs 17 distributed angularly on their peripheries.
- Each of the metal tongues 17 is articulated at its ends between the reaction plate 31 and the intermediate pressure plate 21.
- the metal tongues 17 of the second series are able to transmit the torque, to separate the intermediate pressure plate from the torque output when the clutch is in the disengaged position and to transmit the heat coming from the friction faces of the intermediate pressure plate.
- the intermediate pressure plate 21 is annular in shape and comprises lugs 212 made from material from the outer periphery, each lug 212 serving as a support for the metal tabs 17.
- the first series of metal tabs 16 arranged between the reaction plate 31 and the main pressure plate 22 form a first set of stiffness K1 along the X axis and the second series of metal tabs 17 arranged between the reaction plate 31 and the intermediate pressure plate
- the first set of stiffness K1 and the second set of stiffness K2 are actuated simultaneously. Thanks to their bending, the metal tongues 16, 17 exert axial forces which separate the pressure plates 21, 22 when the pressing force of the clutch actuator 70 decreases or becomes almost zero. The gap created between the pressure and reaction plates is sufficient to avoid any unwanted friction during the disengagement phases.
- Each pressure plate 21, 22 comprises metal tabs 16, 17 distributed circumferentially around the axis of rotation X.
- the metal tabs 17 of the intermediate pressure plate 21 are angularly offset from the metal tabs 16 of the pressure plate.
- main pressure 22 is a pressure that is applied to the pressure plate 21, 22.
- the metal tabs 16 are rigidly attached to the reaction plate 31 and the main pressure plate
- the metal tongues 17 of the second series are rigidly fixed to the reaction plate 31 and the intermediate pressure plate 21 by riveting.
- Fastening rivets 25 press the metal tongues 17 onto the intermediate pressure plate 21.
- Fastening rivets 27 press the metal tongues 17 of the second series onto the reaction plate 31 .
- the metal tongue 16 comprises two ends, one of the ends is rigidly fixed to the main pressure plate 22, the other is rigidly fixed to the reaction plate 31. Between these ends, the metal tongue 16 comprises two zones of articulation 16a, 16b to allow the separation of the main pressure plate 22 with respect to the reaction plate 31.
- the articulation zones 16a, 16b are privileged bending zones of the metal tabs, in particular located near the fixing rivets 18, 19.
- the metal tongue 16 can be fixed rigidly to the reaction plate and the main pressure plate by welding or by screw assembly.
- the metal tongues 16 of the first series can be bent before assembly on the torque cut-off clutch.
- the hinge zones 16a, 16b then correspond to the bending zones of the metal tabs.
- the first series of metal tabs 16 may comprise an axial stack of several metal tabs forming packets of metal tabs distributed circumferentially around the axis X.
- the metal tabs 16 are made from a pretreated steel sheet .
- the axial supports of the metal tabs 16, 17 on the reaction plate 31 are axially offset from the supports on the pressure plates 21, 22. In this way, the tabs metal are bent and accumulate energy that can be released during the next disengagement phase.
- support elements 38 are assembled on the intermediate pressure plate 21 at the level of adjustment tabs 213 arranged on the periphery.
- the adjustment lugs 213 are angularly offset from the support lugs 212.
- the support elements 38 rest on the metal tongues 16 of the first series between their articulation zones 16a, 16b so that the spacing of the intermediate pressure plate 21 with respect to the output member of torque 30 corresponds to at least part of the spacing of the main pressure plate 22 with respect to the torque output member 30. More specifically, the spacing of the intermediate pressure plate 21 with respect to the output member of torque 30 corresponds to half the spacing of the main pressure plate 22 with respect to the torque output member 30.
- the support elements 38 bear in the middle of the metal tabs 16 of the first series, thus the axial displacement of the intermediate pressure plate 21 is adjusted to the axial displacement of the main pressure plate 22.
- the axial displacement of the main pressure plate 22 is twice as large as the axial displacement of intermediate pressure plate 21.
- the axial positioning of the end 38a of the support elements 38 in contact with the metal tongues 16 is important for the correct operation of the torque cut-off clutch.
- the support elements 38 form a device for distributing the spacing of the pressure plates. The purpose of this device for distributing the gap between the pressure plates is to promote even release of the friction discs during the clutch release phase. This limits the loss of energy efficiency.
- Each support element 38 of the torque cut-off clutch comprises a cylindrical rod 38b, one end 38a of which is in contact with the corresponding metal tongue 16. In this way, it is possible to obtain an economical adjustment means because the cylindrical shape is obtained from a standard profile.
- the end 38a of the cylindrical rod 38 is rounded so as not to damage the metal tab 16.
- the means for adjusting the end 38a of the support element 38 comprise a cylindrical surface 38b fitted into a portion of the intermediate pressure plate 21.
- the support element 38 is inserted into a bore 214 d axis parallel to the X axis formed in the intermediate pressure plate 21. This bore 214 is formed in the intermediate pressure plate by a machining operation.
- the adjustment in diameter between the cylindrical surface 38b and the bore 214 is adjusted in order to be able to move the bearing element axially using an axial thrust tool 60.
- the adjustment is carried out when the clutch is in the engaged position.
- the movement of the axial thrust tool 60 along the X axis is done until the end 38a is supported against the metal tab 16 of the first series and reaches a force value of between 5 N and 50 N, preferably between 20 N and 35 N.
- the torque output member 30, more specifically the reaction plate 31 comprises bores 34 distributed angularly around the axis X whose axes parallel to the axis X are substantially coinciding with the axes of the cylindrical rods 38b of each of the bearing elements 38.
- the axial thrust tool 60 passes through the bores 34 to bear against the bearing elements 38.
- Locking means are provided for the locking in the axial position of each support element 38 after the adjustment of the axial position of the end 38a.
- the blocking of the axial position of the support element is obtained by plastic deformation of the cylindrical rod 38b in the intermediate pressure plate.
- a depression 38c is obtained by using a tool 61 which penetrates within an orifice 218 made in the leg 213 of the intermediate pressure plate.
- the hole 218 is perpendicular to the X axis and opens into the hole 214.
- the recess 38c prevents the cylindrical rod 38b from moving after the adjustment operation.
- each of the support elements 38 is inserted into the bore 214 with an axis parallel to the axis X formed in the intermediate pressure plate 21;
- each of the support elements 38 is blocked in the axial position relative to the intermediate pressure plate 21 by making a depression 38c on the cylindrical surface 38b of the cylindrical rod using the tool 61.
- a torque cut-off clutch 10 according to a second embodiment of the invention in which the means for locking the support element 38 comprise at least a locking screw 70.
- the means for adjusting the end 38a of the support element 38 are similar to those used for the first mode of implementation.
- locking screws 70 are inserted into tappings 215 with an axis perpendicular to the axis X formed on the intermediate pressure plate 21.
- the tapping 215 is perpendicular to the axis X and opens into the bore 214.
- Each locking screw 70 bears against the cylindrical rod 38b of the support element for locking the end 38a of the support element in the axial position.
- the locking screw 70 has a pointed end which penetrates the cylindrical surface 38b of the bearing element. The tightening of the locking screw 70 prevents the cylindrical rod 38b from moving after the adjustment operation.
- each of the support elements 38 is inserted into the bore 214 with an axis parallel to the axis X formed in the intermediate pressure plate 21;
- each of the support elements 38 is locked in the axial position relative to the intermediate pressure plate 21 by screwing the locking screw 70 against the cylindrical surface 38b of the support element.
- a torque cut-off clutch 10 according to a third embodiment of the invention in which the means for adjusting the end 38a of the element of support 38 include an external thread 38d machined on the cylindrical rod 38b.
- the support element 38 comprises on its cylindrical part 38b an external thread 38d screwed into a portion of the intermediate pressure plate for adjusting the axial position.
- Each of the support elements 38 is screwed into a thread 216 with an axis parallel to the axis X formed in the intermediate pressure plate using a screwing tool 62. In this way, it is possible to obtain an economical adjustment means because the thread 216 formed in the intermediate pressure plate is obtained from a simple machining.
- the adjustment operation requires the use of a screwing tool 62.
- the screwing tool 62 is inserted into a hollow shape made on the other end of the support element 38.
- Each screw is bearing elements 38 so as to press the end 38a against one of the metal tabs 16 of the first series until a torque value of between 1 Nm and 10 Nm, preferably between 2 Nm and 5 Nm, is reached
- the screwing tool 62 passes through the bores 34 of the reaction plate 31 to drive the support elements 38 in rotation.
- Locking means are provided for the locking in the axial position of each support element 38 after the adjustment of the axial position of the end 38a.
- the blocking of the axial position of the support element is obtained by using blocking nuts 80.
- the locking nuts 80 are screwed onto the external thread 38d of the cylindrical part of each bearing element, each locking nut being tightened on a bearing surface 217 of the intermediate pressure plate 21 for locking in position axial from the end of the support element.
- each of the support elements 38 is inserted into the thread 216 with an axis parallel to the axis X formed in the intermediate pressure plate;
- each of the support elements 38 is screwed along the X axis so as to press the end 38a against the corresponding metal tab 16 of the first series until a torque value is reached. between 1 Nm and 10 Nm.
- the displacement of the cylindrical rod 38b is achieved by rotating the screwing tool 62 along the axis X.
- each of the support elements 38 is locked in the axial position with respect to the intermediate pressure plate 21 by inserting a locking nut 80 on the external thread 38d of the cylindrical rod 38b.
- the locking means can also be obtained by welding or gluing the cylindrical rod 38b to the intermediate pressure plate 21 after adjusting the axial position of the end 38a of the support element.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR2008352A FR3113263B1 (en) | 2020-08-07 | 2020-08-07 | TORQUE CUT CLUTCH FOR HYBRID TRANSMISSION |
PCT/EP2021/068196 WO2022028786A1 (en) | 2020-08-07 | 2021-07-01 | Torque disconnect clutch for a hybrid transmission |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4193074A1 true EP4193074A1 (en) | 2023-06-14 |
Family
ID=73013727
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21734876.2A Pending EP4193074A1 (en) | 2020-08-07 | 2021-07-01 | Torque disconnect clutch for a hybrid transmission |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP4193074A1 (en) |
FR (1) | FR3113263B1 (en) |
WO (1) | WO2022028786A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2830589B1 (en) | 2001-10-08 | 2004-04-23 | Valeo | AUTOMOTIVE VEHICLE TRANSMISSION KIT INCLUDING TWO CLUTCHES AND AN ELECTRIC MACHINE |
EP1736345A1 (en) | 2005-06-22 | 2006-12-27 | Zf Friedrichshafen Ag | Drive module with electric motor |
WO2015070859A1 (en) * | 2013-11-13 | 2015-05-21 | Schaeffler Technologies AG & Co. KG | Friction clutch |
WO2015144164A1 (en) * | 2014-03-25 | 2015-10-01 | Schaeffler Technologies AG & Co. KG | Spring element for a drive unit of a remotely-controlled adjustment device |
DE102015225422A1 (en) * | 2015-12-16 | 2017-06-22 | Schaeffler Technologies AG & Co. KG | Disconnect coupling for a motor vehicle |
DE102017110041A1 (en) * | 2017-05-10 | 2018-11-15 | Schaeffler Technologies AG & Co. KG | Coupling device and drive train |
-
2020
- 2020-08-07 FR FR2008352A patent/FR3113263B1/en active Active
-
2021
- 2021-07-01 WO PCT/EP2021/068196 patent/WO2022028786A1/en unknown
- 2021-07-01 EP EP21734876.2A patent/EP4193074A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
FR3113263A1 (en) | 2022-02-11 |
WO2022028786A1 (en) | 2022-02-10 |
FR3113263B1 (en) | 2022-07-22 |
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