EP3721110A1 - Clutch actuator - Google Patents
Clutch actuatorInfo
- Publication number
- EP3721110A1 EP3721110A1 EP18814520.5A EP18814520A EP3721110A1 EP 3721110 A1 EP3721110 A1 EP 3721110A1 EP 18814520 A EP18814520 A EP 18814520A EP 3721110 A1 EP3721110 A1 EP 3721110A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- actuator
- cover
- housing
- layers
- viscoelastic material
- 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.)
- Withdrawn
Links
- 239000002131 composite material Substances 0.000 claims abstract description 33
- 239000003190 viscoelastic substance Substances 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 27
- 230000009467 reduction Effects 0.000 claims abstract description 16
- 230000007246 mechanism Effects 0.000 claims abstract description 14
- 238000013016 damping Methods 0.000 claims description 11
- 229920001971 elastomer Polymers 0.000 claims description 4
- 239000000806 elastomer Substances 0.000 claims description 4
- 241001249696 Senna alexandrina Species 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 description 8
- 239000010959 steel Substances 0.000 description 7
- 230000033001 locomotion Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000004033 plastic Substances 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000004954 Polyphthalamide Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000002485 combustion reaction 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
- 230000000694 effects Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920006375 polyphtalamide Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 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
- F16D28/00—Electrically-actuated clutches
-
- 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
- F16D29/00—Clutches and systems of clutches involving both fluid and magnetic actuation
- F16D29/005—Clutches and systems of clutches involving both fluid and magnetic actuation with a fluid pressure piston driven by an electric motor
-
- 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
- F16D2121/00—Type of actuator operation force
- F16D2121/18—Electric or magnetic
- F16D2121/24—Electric or magnetic using motors
-
- 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
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0034—Materials; Production methods therefor non-metallic
- F16D2200/0056—Elastomers
Definitions
- the present invention relates to a clutch actuator, in particular for a transmission system of a motor vehicle.
- the invention applies in particular, but not exclusively, to the actuation of a single or double clutch system whose idle state can be normally engaged or normally disengaged, at the actuation of a box synchronizer manual transmission, when operating a robotic gearbox, when operating a manual double-clutch gearbox, or when operating a coupling clutch of a combustion engine with an electric machine when the latter two are part of a drive chain of a hybrid vehicle.
- the clutch actuator makes it possible to move from an engaged state, in which the transmission system makes it possible to transmit a torque or a movement, to a disengaged state, in which such transmission is not performed.
- the clutch actuator also keeps the system in the engaged or disengaged state.
- WO2015 / 090316 discloses a clutch actuator comprising a housing, an electric motor mounted in the housing and whose output axis is rotatably coupled to a first gear of a reduction mechanism, a device for converting the movement of roto-linear type comprising a screw carrying a second pinion meshing with the first pinion and having a nut.
- the nut cooperates with the screw and is coupled both in rotation and in translation with a thrust member.
- the thrust member allows to actuate the displacement of a piston of a master cylinder, so as to move a volume of oil.
- Rotation of the motor shaft thus causes the piston to move through the gears and the motion transformation device.
- Such an actuator is said to be hydrostatic in that it allows the displacement of a volume of fluid, without, however, generating a flow of hydraulic fluid, the volume of fluid remaining in effect virtually unchanged over time.
- a problem related to the clutch actuators relates to the vibrations and noises they can produce, especially at the level of the reduction mechanism. Indeed, acoustics appear as an element of essential comfort in the current motor vehicles so that it becomes necessary to prevent the transmission of vibrations and sounds produced by an actuator to be transmitted to other elements of the vehicle and particularly to the cabin. For this, it is necessary to mechanically and acoustically decouple the actuator from the rest of the vehicle so as to isolate the vibrations and noise of the actuator.
- One of the aims of the invention is to reduce the noise of the actuator in order to arrive at a noise level of the order of 55 to 60 dB (A) at 1 meter.
- damping pads only mitigate the so-called solid noise due to the transmission of vibrations by the actuator or the actuator supports.
- the present invention relates to an actuator for a motor vehicle clutch system, the actuator comprising an electric motor housed in a carcass, a reduction mechanism connected to the electric motor, a housing receiving the reduction mechanism and a cover to be attached to housing, at least one of the carcass, the housing, the cover is constituted and / or is coated with a laminated composite material comprising at least two layers of material and at least one of the layers is made of a viscoelastic material.
- a viscoelastic material is a material with a high damping coefficient over a certain frequency range.
- the elastic material may be a polymer, for example an elastomer.
- the cover is constituted by a laminated composite material
- the structure of these elements is made of laminated composite material
- the viscoelastic material may be sprayed or overmoulded on at least one of the carcass, the housing, the cover.
- the viscoelastic material may be sprayed or overmoulded on the outer surface of at least one of the carcass, housing, lid.
- the viscoelastic material may be sprayed or overmolded on the inner surface of at least one of the carcass, housing, lid.
- the laminated composite material is made in the form of at least one insulating plate attached to at least l one of the elements among the carcass, the housing, the lid.
- the laminated composite material comprises at least three layers of material
- the laminated composite material comprises a first outer layer and a second outer layer and at least one intermediate layer of viscoelastic material.
- the first outer layer and the second outer layer make it possible to maintain the intermediate layer of viscoelastic material and to bring a static and dynamic stiffness to the assembly.
- the ratio between the thickness of the intermediate layer and that of the first outer layer or the second outermost layer will be between 0.03 and 0.6.
- first outer layer and the second outer layer have different thicknesses.
- one of the outer layers is at least two times thicker than the other.
- the viscoelastic material has a tangential damping factor d greater than 0.1 to 200Hz in a temperature range of between 20 ° C and 100 ° C for a clutch actuator type bias.
- At least one of the outer layers is metallic.
- the use of a metal layer also filters the electromagnetic waves and improves the electromagnetic compatibility between the clutch actuator and the rest of the vehicle.
- At least one of the layers of material is steel or aluminum or steel / aluminum alloy or hard plastic.
- the cover is fixed to the housing and closes a housing of the housing in which is placed the reduction mechanism.
- the lid can also provide an acoustic seal, for example by means of a seal disposed between the housing and the cover.
- FIG. 1 is a perspective view of a clutch actuator according to a first embodiment of the invention
- FIG. 2 is a sectional diagram according to the thickness of a laminated composite material according to the first embodiment
- FIG. 3 is a perspective view of a clutch actuator according to a second embodiment of the invention.
- FIG. 4 is a sectional diagram according to the thickness of a laminated composite material according to the second embodiment of.
- FIG. 1 represents a perspective view of a clutch actuator 1. This comprises an electric motor 4 extending along an axis A and housed in a carcass 5, a reducing mechanism (not visible) connected to the electric motor 4, a casing 2 receiving the reduction mechanism and a cover 3 intended to be fixed to the casing 2.
- the casing 2 comprises a first part 2a forming a casing delimiting an internal volume and a second part 2b forming a casing, extending according to a axis B from the first part and also delimiting an internal volume.
- the internal volume of the second portion 2b opens into the internal volume of the first portion 2a.
- the axis B is parallel to the axis A and is offset with respect to said axis A.
- the internal volume of the first part 2a can be closed by the cover 3 adapted to be fixed by screwing, riveting, latching or any other suitable fastening means on the first part 2a.
- the housing 2 and the cover 3 are for example plastic, and can be welded to one another by laser welding or ultrasonic welding. Alternatively, the housing 2 and / or the cover 3 can be made of aluminum or steel.
- the housing 2 of the actuator 1 is for example intended to be fixed to a casing of a gearbox, for example by means of a support not shown.
- the electric motor 4 is for example a brushless permanent magnet motor or brushless motor, mounted on the housing 2.
- the motor 4 is housed in the carcass 5 also forming a fastening flange 6, said flange 6 allowing the attachment of the carcass 5 of the engine 4 on the casing 2, for example by means of screws 7 engaged in threads located at the first portion 2a of the casing 2.
- a seal may be provided between the fixing flange 6 and the casing 2.
- the carcass 5 also comprises at least one electrical connector 8, comprising one or more connection pins.
- the motor 4 further comprises a rotating axis, integral with the rotor of the motor 4.
- the axis extends along the axis A and opens into the internal volume of the first portion 2a of the housing 2.
- the shaft carries a first pinion , a second pinion is mounted idle, that is to say freely rotatable, about an axis of rotation, and a third pinion is integral in rotation with a first end of a screw extending according to the B.
- the three gears are housed in the internal volume of the housing 2a.
- the reduction ratio for example is between 1 and 5.
- the pinions can be lubricated with oil or grease.
- the reduction mechanism within the meaning of the invention, is defined by these gears.
- the third pinion is fixed to the rear end of the screw, that is to say at the end located on the side of the lid 3.
- the screw extending along the axis B comprises a roto-linear type motion transformation device comprising a nut.
- the nut cooperates with the screw and is coupled both in rotation and in translation with a thrust member.
- the thrust member serves to actuate the displacement of a piston of a master cylinder 9, so as to move a volume of oil.
- the roto-linear type motion transformation device is housed in the internal volume of the housing 2b.
- the roto-linear type of motion transformation device may for example comprise a screw-nut type system, a ball screw, a planetary roller screw.
- At least one of the actuator elements that is to say the carcass 5, the casing 2 or the cover 3, is constituted and / or is coated with a laminated composite material comprising at least two layers, at least one of which layers is made of a viscoelastic material, that is to say a material having a significant loss factor.
- the housing 2 is constituted by a laminated composite material 10 comprising at least two layers of material.
- a laminated composite material 10 comprising at least two layers of material. The detail of this laminated composite material will be described in relation to FIG.
- the cover 3 of the actuator 1 is constituted by a laminated composite material 20 comprising at least two layers, at least one of the layers is made of a viscoelastic material.
- the cover 3 here comprises three layers including two outer layers denoted CE1 and CE2 and an intermediate layer denoted Cl.
- the intermediate layer C1 is made of a viscoelastic material. The detail of this laminated composite material will be described in relation to FIG. 4.
- FIG. 2 represents the various layers of a laminated composite material 10 according to an embodiment comprising two layers, a first layer denoted C1 and a second layer denoted C2.
- a first layer denoted C1 corresponds to the material constituting the housing 2 and is made of aluminum.
- the first layer C1 may be made of hard plastic, for example a polyphthalamide thermoplastic reinforced with fiberglass.
- the second layer C2 is made of a viscoelastic material, ie a material having a tangent loss factor d greater than 0.1 at 200 Hz, for a temperature in a range of 20 ° C to 100 ° C and in vibratory stress conditions of the clutch actuator type.
- the loss factor also known as the damping factor, is a measure of the ratio of the energy dissipated by damping to the conserved elastic energy.
- This viscoelastic material is for example an elastomer.
- the second layer C2 is here sprayed or overmolded on the first layer C1 corresponding to the material constituting the housing 2.
- the carcass 5 of the engine 4 is constituted by a laminated composite material 10 comprising at least two layers of material.
- the first layer C1 of material is the material of the carcass 5 which is for example made of steel and the second layer of material C2 is a viscoelastic material sprayed or overmolded.
- the viscoelastic material is here pulverized or overmolded on the outer surface of the casing 2 or the casing 5. Alternatively, not shown, the viscoelastic material can be sprayed or overmolded on the inner surface of the casing 2.
- FIG. 3 represents a perspective view of a clutch actuator 1 identical to that of FIG. 1, with the difference that at least one of the elements of the actuator, that is to say the carcass 5, the casing 2 or the cover 3 is coated with a laminated composite material 20 comprising at least two layers, at least one of the layers is made of a viscoelastic material.
- the laminated composite material is made in the form of one or more insulating plates 11.
- a plurality of insulating plates 11 are arranged on the actuator 1. These insulating plates 11 are fixed on the outer surface of FIG. at least one of the elements of the actuator 1 among the carcass 5, the housing 2, the cover 3 by screwing, riveting, gluing or any other suitable fastening means.
- the structure of the casing 2 is made with stiffening elements 12 arranged between the insulating plates 11 and the casing 5, the casing 2 or the cover 3. These stiffening elements 12 have the role of stiffening the entire actuator 1
- the insulating plates 11 here comprise three layers including two outer layers denoted CE1 and CE2 and an intermediate layer denoted Cl.
- the intermediate layer C1 is formed in a viscoelastic material. The detail of this laminated composite material 20 will be described in relation to FIG. 4.
- FIG. 4 represents the various layers of a laminated composite material 20 according to one embodiment comprising three layers, two outer layers denoted CE1 and CE2 and an intermediate layer C1.
- a material is used to produce the cover 3 of the actuator 1 of Figure 1 or the insulating plates 11 of Figure 3.
- the intermediate layer C1 is made of a viscoelastic material, that is to say a material having a tangential loss factor d greater than 0.1 to 200Hz, for a temperature in a range of 20 ° C to 100 ° C and under vibratory stress conditions of the clutch actuator type.
- the loss factor also known as the damping factor, is a measure of the ratio of the energy dissipated by damping to the conserved elastic energy.
- This viscoelastic material is for example an elastomer and the ratio between the thickness of the intermediate layer and that of the outermost layer is for example between 0.03 and 0.6.
- the outer layers CE1 and CE2 are made of a material whose dynamic and static stiffness will be much stronger than that of the viscoelastic material, that is to say in a material having a damping factor of less than 0.1 in the conditions described above, such as a metal such as steel or a steel / aluminum alloy or a hard plastic.
- the role of the outer layers CE1 and CE2 is to ensure an impedance or dynamic stiffness break with the intermediate layer C1 of viscoelastic material which is sandwiched between the outer layers CE1 and CE2, which makes it possible to filter the vibrations and noise in transmission.
- the two outer layers CE1 and CE2 may be of the same material or of a different material.
- At least one of the layers of the laminated composite material 20 is metallic so as to form a barrier for the electromagnetic waves and improve the electromagnetic compatibility between the electric motor 4 and / or the reduction mechanism and the other elements of the vehicle.
- the thicknesses are different, for example one of the outer layers CE1, CE2 is at least twice as thick as the other, so to optimize the decoupling over the target frequency range for the decoupling between the actuator 1 and the structure of the vehicle and thus obtain a low acoustic transparency of the element or elements comprising the laminated composite material 20 in a given frequency range.
- This decoupling optimization makes it possible to reduce the transmission of noise through these elements.
- the two outer layers CE1 and CE2 are made of steel, their thickness will be different, for example 1 mm for the CE1 layer and 2 mm for the CE2 layer.
- the various materials constituting the laminated composite material 20 as well as their thickness can be chosen as a function of the frequencies for which a strong decoupling is desired, for example the resonance frequency or frequencies of the actuator 1.
- composition of the laminated composite material 20 used in one of the elements of the actuator 1 is not limited to the laminated composite material 20 shown in FIG. 4 but extends to any laminated composite material comprising at least one layer made in a viscoelastic material and at least one rigid layer for ensuring the rigidity of the actuator 1 during its use.
- the laminated composite material may for example comprise five layers including three intermediate layers comprising two layers made of material.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Fluid Mechanics (AREA)
- Electromagnetism (AREA)
- Laminated Bodies (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1761776A FR3074863B1 (en) | 2017-12-07 | 2017-12-07 | CLUTCH ACTUATOR |
PCT/EP2018/082580 WO2019110356A1 (en) | 2017-12-07 | 2018-11-26 | Clutch actuator |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3721110A1 true EP3721110A1 (en) | 2020-10-14 |
Family
ID=61224094
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18814520.5A Withdrawn EP3721110A1 (en) | 2017-12-07 | 2018-11-26 | Clutch actuator |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3721110A1 (en) |
KR (1) | KR20200090896A (en) |
FR (1) | FR3074863B1 (en) |
WO (1) | WO2019110356A1 (en) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3706849A1 (en) * | 1987-03-03 | 1988-09-15 | Sachs Systemtechnik Gmbh | ACTUATOR, ESPECIALLY FOR A MOTOR VEHICLE CLUTCH |
US20060062977A1 (en) * | 2004-09-22 | 2006-03-23 | Sigler David R | Bonded lightweight structural sheet |
US7833630B2 (en) * | 2004-12-20 | 2010-11-16 | Gm Global Technology Operations, Inc. | Weldable metal composites and methods |
US20060137799A1 (en) * | 2004-12-29 | 2006-06-29 | Enamul Haque | Thermoplastic composites with improved sound absorbing capabilities |
WO2015090316A1 (en) | 2013-12-17 | 2015-06-25 | Schaeffler Technologies AG & Co. KG | Hydrostatic actuator arrangement and method for mounting such an actuator arrangement |
DE102016207237B4 (en) * | 2016-04-28 | 2018-02-22 | Robert Bosch Gmbh | Actuator for actuating a clutch of a vehicle |
CN205918797U (en) * | 2016-08-24 | 2017-02-01 | 宁波华盛汽车部件有限公司 | A exhaust sound -attenuating structure for connecting hydraulic retarber |
-
2017
- 2017-12-07 FR FR1761776A patent/FR3074863B1/en active Active
-
2018
- 2018-11-26 KR KR1020207019136A patent/KR20200090896A/en not_active Application Discontinuation
- 2018-11-26 WO PCT/EP2018/082580 patent/WO2019110356A1/en unknown
- 2018-11-26 EP EP18814520.5A patent/EP3721110A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
WO2019110356A1 (en) | 2019-06-13 |
FR3074863A1 (en) | 2019-06-14 |
KR20200090896A (en) | 2020-07-29 |
FR3074863B1 (en) | 2019-11-08 |
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