WO2020245474A1 - Système magnétique de compensation de rigidité - Google Patents

Système magnétique de compensation de rigidité Download PDF

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Publication number
WO2020245474A1
WO2020245474A1 PCT/ES2019/070380 ES2019070380W WO2020245474A1 WO 2020245474 A1 WO2020245474 A1 WO 2020245474A1 ES 2019070380 W ES2019070380 W ES 2019070380W WO 2020245474 A1 WO2020245474 A1 WO 2020245474A1
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WO
WIPO (PCT)
Prior art keywords
stiffness
annular channel
rotor
magnetic
annular
Prior art date
Application number
PCT/ES2019/070380
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English (en)
Spanish (es)
Inventor
Aitor Olarra
Imanol EGAÑA
Original Assignee
Fundación Tekniker
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fundación Tekniker filed Critical Fundación Tekniker
Priority to PCT/ES2019/070380 priority Critical patent/WO2020245474A1/fr
Publication of WO2020245474A1 publication Critical patent/WO2020245474A1/fr

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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
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/50—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members
    • F16D3/72—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members with axially-spaced attachments to the coupling parts
    • 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
    • F16D2300/00—Special features for couplings or clutches
    • F16D2300/22—Vibration damping

Definitions

  • the present invention belongs to the field of coupling devices that connect two elements together for the transmission of power and the position of one element to the other and to avoid high reaction forces in the elements due to their misalignment. More particularly, the invention relates to a stiffness compensation magnetic system that significantly reduces the residual stiffness of elastic couplings, and more specifically, their flexural and radial stiffness.
  • Couplings are devices used to connect two shafts together at their ends to transmit position and torque from the driving shaft (input shaft) to the driven shaft (output shaft).
  • Elastic couplings are a type of coupling that comprises elastic elements that can be deformed to absorb part of the reaction loads generated by misalignment between the input shafts and the output shafts.
  • the elastic elements could be made of pre-compressed natural or synthetic rubber. These resilient couplings are capable of tolerating varying degrees of misalignment and some parallel misalignment.
  • Elastic couplings allow correction of deviations from axial alignment, radial alignment and torsional alignment, and are also elastic in terms of the direction of rotation. Elastic couplings transmit torque or other loads through the elements elastic. In addition, they can also be used for vibration damping or noise reduction. In rotating shaft applications, an elastic coupling can protect drive and driven shaft components (such as bearings) from the damaging effects of conditions such as misaligned shafts, vibration, shock loads, and thermal expansion of the shafts or other components.
  • Elastic couplings are commonly used in different types of machines to reduce unwanted reactions that occur when two non-coaxial shafts are connected together.
  • the relationship between torsional and radial stiffness and the relationship between torsional and flexural stiffness are figures of merit for elastic couplings.
  • a high torsional stiffness in the elastic coupling allows a more precise transmission of displacements and better dynamics between the shafts, while a low flexural and radial stiffness generates low reactions due to misalignment. All these aspects, namely torsional stiffness, flexural stiffness and radial stiffness, are important in precision devices.
  • the invention provides a solution to the aforementioned problems by means of a stiffness compensation magnetic system according to claim 1.
  • Preferred embodiments of the invention are defined in the dependent claims.
  • a first aspect of the invention relates to a stiffness compensation magnetic device comprising a rotor that is connectable to a first element and a stator that is connectable to a second element.
  • the stator further comprises an annular channel and at least one permanent magnet mounted on the bottom wall of the annular channel.
  • the rotor is partially inserted in the annular channel and is located in the proximity of the at least one permanent magnet.
  • the annular channel of the stator and at least the portion of the rotor that is inserted into the annular channel are made of a ferromagnetic material, such as iron, steel or nickel, among others.
  • the rotor is configured to interact with the magnetic field generated by the at least one permanent magnet to compensate for the forces generated within the elastic coupling device.
  • the elastic coupling device interconnects the first element and the second element and the forces generated in the elastic coupling are created due to misalignment between the first element and the second element.
  • This magnetic stiffness compensating device reduces the flexural and radial stiffnesses suffered by the first element and the second element within the elastic coupling device.
  • the at least one permanent magnet in the stator generates a magnetic field that acts on the rotor compensating for the reaction charges generated in the elements within the elastic coupling device, more particularly, the residual loads generated due to flexural and radial deflection suffered in the first element and the second element within the elastic coupling device. Therefore, the magnetic stiffness compensation device, which is a passive compensation device, applies a negative stiffness that is adjusted to override the stiffness of the elastic coupling in radial and flexural degrees of freedom (DOF).
  • DOE degrees of freedom
  • the annular channel in the stator is defined by two annular concentric walls and the at least one permanent magnet is located on the bottom surface of the annular channel between the two annular concentric walls.
  • the annular channel is a C-shaped annular channel defined by the bottom wall and two side walls substantially perpendicular to the bottom wall.
  • the at least one permanent magnet is also located on the bottom wall of the C-shaped annular channel.
  • the rotor and more particularly the portion of the rotor that is inserted into the annular channel, is closely spaced from and located with respect to the annular channel to form a uniform annular space therebetween.
  • the annular space is located between the portion of the rotor inserted in the annular channel and the walls of the stator that define the annular channel.
  • the size of the annular space may depend on the size of the stiffness compensation magnetic system.
  • the at least one permanent magnet is magnetized in the radial direction. In this way, the magnetic field created by the at least one permanent magnet compensates for the forces transmitted from the coupling. elastic through the rotor in the radial and flexural directions.
  • the permanent magnets can be arranged in the annular channel such that the permanent magnets are magnetized in the axial direction.
  • the at least one permanent magnet is a single annular permanent magnet located along the entire bottom wall of the annular channel. With the annular permanent magnet located along the entire annular channel, a static magnetic field is generated along the entire perimeter of the stator that allows the stiffness compensation magnetic system to compensate for greater radial and flexural deviations in the clamping device. elastic coupling.
  • the at least one permanent magnet is a set of permanent magnets located along the bottom wall of the annular channel. The permanent magnets of the set can be arranged one after the other, completely covering the lower wall of the annular channel, or they can be arranged separately from each other (leaving a small space between each of them) and partially covering the lower wall of the annular canal.
  • the forces generated within the elastic coupling device that are compensated for by the magnetic stiffness compensation system can be radial forces, flexural forces, and any combination thereof.
  • the first element is a first shaft and the second element is a second shaft such that the rotor connects to the first shaft through a first opening through which the first shaft passes and the stator connects to the second shaft through a second. opening through which the second axis passes.
  • the rotor and stator define an internal chamber in which the device is housed. elastic coupling. The elastic coupling receives the first shaft on a first hub and the second shaft on a second hub.
  • the resilient coupling device is axially disposed between and for joint rotation of the first shaft and the second shaft.
  • the first rotor opening, the second stator opening, and the respective bushings of the resilient coupling device are all substantially aligned to receive the first shaft and the second shaft, respectively.
  • the first shaft is a drive shaft and the second shaft is a driven shaft
  • the resilient coupling device is configured to transmit position and power from the drive shaft to the driven shaft
  • first axis and the second axis are non-coaxial axes.
  • Parallel misalignment, angular misalignment and axial misalignment between the first axis and the second axis can depend on the particular design of the elastic coupling device and can be determined by the tolerances of the elastic members of the elastic coupling device.
  • the first element is an axis and the second element is an encoder.
  • the encoder has a hole into which the shaft is inserted and incorporates the elastic coupling device so that the axial axis of the hole and the elastic coupling device are located in correspondence.
  • the shaft is inserted into the hole that passes through the elastic coupling device that compensates for most of the reaction forces due to misalignments between the shaft and the encoder.
  • the rotor comprises an opening through which the shaft passes and the stator is connected to the encoder. Therefore, the stiffness compensation magnetic device reduces the residual radial and flexural stiffnesses suffered by the shaft and the encoder within the elastic coupling device.
  • a second aspect of the invention relates to a compensation assembly comprising a stiffness compensation magnetic device as previously described and an elastic coupling device connected to the first element and the second element.
  • the elastic coupling device is configured to transmit power and position of the first element to the second element and to avoid high reaction forces in the support of the first element and the second element due to misalignments between the first element and the second element.
  • the center of the stiffness-compensating magnetic device and the center of the elastic coupling device are substantially coincident with each other. This allows the stiffness compensation magnetic device to prevent cross interference between radial and flexural DOFs.
  • the stiffness compensation magnetic device has several advantages and / or differences compared to previous devices. In particular, it is able to compensate for most of the radial and flexural stiffness suffered in the first element and the second element within the elastic coupling device. This significantly reduces the unwanted reactions that can arise. Its behavior is linear within the range of interest, that is, the working range of the elastic coupling device, and there is no cross interference between radial and flexural DOFs. By reducing the unwanted reactions that can arise and that can be transmitted from the elastic coupling device to the rest of the components of the power transmission system, the detrimental effects of conditions such as misaligned shafts, vibrations, stress loads can be minimized. shock and thermal expansion of shafts or other components within power transmission systems. Thus, the life of the components of power transmission systems, including driven and driven shaft components such as shafts or bearings, elastic coupling devices, power transmitting devices or receiving devices, can be extended. power.
  • Figure 1 shows a cross-sectional view of an example of a stiffness compensation magnetic system applied to an elastic coupling device.
  • Figure 2 shows a detailed view of the annular channel of Figure 1 with the annular portion of the rotor inserted therein.
  • Figure 3 shows a perspective view of the annular channel of Figure 1 with a set of permanent magnets housed inside.
  • Figure 4 shows an exploded perspective view of the example of a stiffness compensation magnetic system of Figure 1.
  • Figure 5 shows a cross-sectional perspective view of the example stiffness compensation magnetic system of Figure 4 with the rotor partially inserted into the stator.
  • Figure 6 shows a cross-sectional view of another example of a stiffness compensation magnetic system to compensate for stiffness due to misalignment between an axis and an encoder.
  • Figures 7A and 7B show two graphs corresponding to the results of a no-spin test and a spin test of the stiffness compensation magnetic system that is installed on an angle calibration bench.
  • Figure 1 shows a cross-sectional view of an example of a stiffness compensation magnetic system 100 applied to an elastic coupling device 1 12. It should be understood that the stiffness compensation magnetic system 100 depicted in Figure 1 may include components additional components and that some of the components described herein can be eliminated and / or modified without departing from the scope of the magnetic stiffness compensation system 100.
  • the stiffness compensating magnetic system 100 comprises a rotor 101 which is coupled to a first shaft 103 through a first opening 105 and a stator 102 which is coupled to a second shaft 104 through a second opening 106.
  • the stator 102 further comprises a channel annular 107 and a permanent magnet 108 mounted to the bottom wall 109 of the annular channel 107.
  • An annular portion 1 10 of the rotor 101 is inserted into the annular channel 107 and is located in proximity to the permanent magnet 108.
  • the annular portion 1 10 of the rotor 101, the bottom wall 109 and the side walls 1 1 1 of the stator 102, which define the annular channel 107, are made of a ferromagnetic material, eg, iron.
  • stator 102 and rotor 101 can also be made of the same ferromagnetic material, or they can be made of any other material that is capable of providing sufficient strength to the stiffness-compensating magnetic system 100 to withstand the forces generated within it.
  • the rotor 101, and more particularly the annular portion 1 10 of the rotor 101 interacts with the magnetic field generated by the permanent magnet 108 of the stator 102 to compensate the forces generated within the elastic coupling device 1 12 due to misalignment between the first shaft 103 and second shaft 104.
  • the elastic coupling device 1 12 receives the first shaft 103 and the second shaft 104 on respective bushings (not shown in this figure) and transmits power and position from one shaft to the other.
  • Figure 2 shows a detailed view of the annular channel 107 of Figure 1 with the annular portion 1 10 of the rotor 101 inserted therein.
  • the ferromagnetic annular portion 1 10 of the rotor 101 is inserted into the annular channel 107 of the stator 102.
  • the annular permanent magnet 108 located on the bottom wall 109 of the annular channel 107 generates a magnetic field 1 13 in a radial direction to the compensation magnetic system. stiffness 100.
  • the ferromagnetic annular portion 1 10 of the rotor 101 is closely spaced from and positioned with respect to the annular channel 107 to form a uniform annular space 1 14 therebetween.
  • Annular space 1 14 is located between the surfaces external 1 15 of the ferromagnetic annular portion 1 10, the bottom wall 109 and the internal surfaces 1 16 of the side walls 1 1 1.
  • the annular portion 1 10 of the rotor 101 interacts with the magnetic field 1 13 generated by the annular permanent magnet 108 to compensate for the forces generated within the elastic coupling device 1 12.
  • annular permanent magnet 108 is inserted into the bottom wall 109 of the annular channel 107, the annular permanent magnet 108 can be mounted on the upper surface of the bottom wall 109.
  • annular permanent magnet 108 partially occupies the surface of the bottom wall 109
  • the annular permanent magnet 108 can be sized to fully occupy the bottom wall 109.
  • annular permanent magnet 108 is a single annular permanent magnet, in some other examples, the annular permanent magnet 108 may be a set of permanent magnets attached to the bottom wall 109 of the annular channel 107.
  • Figure 3 shows a perspective view of the exemplary annular channel 107 of Figure 1 with a set of permanent magnets 108 housed therein.
  • the annular channel 107 of the stator 102 is defined by the bottom wall 109 and two side walls 1 1 1, an external annular concentric wall 1 1 1 a and an internal annular concentric wall 1 1 b, attached to the internal surface of the annular wall 117 of stator 102.
  • the external annular concentric wall 1 11 a is located in correspondence with the external perimeter of the stator 102.
  • the two walls Annular concentric 1 1 1 a-1 11 b are substantially perpendicular to the annular wall 1 17 of stator 102.
  • the permanent magnet assembly 108a-n is formed of a plurality of individual permanent magnets coupled, one after the other, to the bottom wall 109 of the annular channel 107. These permanent magnets 108a-n are magnetized in the radial direction to generate a magnetic field in a direction perpendicular to the axial axis of the permanent magnet assembly 108a-n, and therefore radial to the stiffness compensation magnetic system 100.
  • the 108a-n is made up of a plurality of individual permanent magnets 108a-n located next to each other, in some other examples, the individual permanent magnets 108a-n may be slightly spaced from each other, but close enough to generate a magnetic field with the ability to compensate for the reactive forces generated in the elastic coupling device.
  • Figure 4 shows an exploded perspective view of the example of a stiffness compensation magnetic system 100 of Figure 1.
  • the rotor 101 has a first opening 106 through which the first shaft 103 passes and the stator 102 comprises a second opening (not shown in this figure) through which the second shaft 104 passes.
  • the rotor 101 is formed by a side wall 1 18, an annular wall 1 19 that surrounds the outer perimeter of the side wall 1 18 and the annular portion 1 10 that surrounds the outer perimeter of the annular wall 1 19 and is substantially perpendicular to the annular wall 1 19
  • This annular portion 1 10 is made of a ferromagnetic material, such as steel.
  • the rotor 101 can be completely made of ferromagnetic material, although in some other examples only the annular portion 1 10 or the outer part of the annular portion 1 10 that is inserted into the annular channel 107 of the stator 102 can be manufactured. made of ferromagnetic material.
  • the rotor 101 may comprise a guiding portion (not shown) attached to the inner surface of the side wall 1 18 and located in correspondence with the first opening 105 to guide the first shaft 103 towards the elastic coupling device 1 12.
  • Stator 102 comprises annular channel 107 and annular permanent magnet 108 mounted on bottom wall 109 of annular channel 107.
  • Stator 102 has an external annular concentric wall 1 1 1 a and an internal annular concentric wall 1 1 1 b attached to the inner surface of the annular wall 1 17 of the stator 102 that define the annular channel 107.
  • the external annular concentric wall 1 1 1 a is located in correspondence with the external perimeter of the stator 102.
  • the two annular concentric walls 111 a-111 b are substantially perpendicular to the annular wall 117.
  • the annular wall 117 surrounds the outer perimeter of the side wall (not shown in this figure) and is substantially perpendicular to said side wall of the stator 102.
  • the stator 102 may also have a second guiding portion (not shown in this figure) attached to the inner surface of its side wall and located in correspondence with the second opening (not shown in this figure) to guide the second axis 104 towards the elastic coupling device 1 12.
  • the rotor 101 and the stator 102 define an internal chamber 120 in which the elastic coupling device 1 12 is housed.
  • the rotor 101, and more particularly the external annular part of the annular portion 1 10, is to be inserted into annular channel 107 and it locates in proximity to the annular permanent magnet 108.
  • the rotor 101 interacts with the magnetic field generated by the annular permanent magnet 108 to compensate the forces generated within the elastic coupling device 1 12.
  • the size of the annular permanent magnet 108, stator 102, and rotor 101 can vary.
  • a larger annular permanent magnet 108, stator 102 and rotor 101 can be used to generate a larger magnetic field, and vice versa.
  • the annular channel 107 and more particularly the portion of the stator 102 comprising the two annular concentric walls 1 1 1 a-1 1 1 b and the bottom wall 109, is made of a ferromagnetic material, for example, steel.
  • the stator 102 may be completely made of ferromagnetic material, while in some other examples only the annular concentric walls 1 1 1 a-1 1 1 b and the bottom wall 109 could be made of ferromagnetic material.
  • Figure 5 shows a cross-sectional perspective view of the example stiffness compensation magnetic system 100 of Figure 4 with rotor 101 partially inserted into stator 102.
  • the center of the magnetic compensation assembly 100 and the center of the elastic coupling device 1 12 substantially co-index with each other. This allows the magnetic stiffness compensation system 100 to avoid cross interference between radial and flexural DOFs. Furthermore, the elastic coupling device 1 12 is arranged axially between and for rotation joint of the first shaft 103 and the second shaft 104.
  • the first shaft 103 is inserted into the stiffness compensating magnetic system 100 through the first opening 106 and is driven towards the elastic coupling device 1 12.
  • the second shaft 104 is inserted into the stiffness compensating magnetic system 100 a through the second opening 106 and is led towards the elastic coupling device 112.
  • the first shaft 103 is housed in a first gear hub and the second shaft 104 is housed in a second gear hub of the coupling device elastic 1 12.
  • Elastic coupling device 1 12 is located within internal chamber 120 defined by rotor 101 and stator 102.
  • Figure 6 shows a cross-sectional view of another example stiffness compensation magnetic system 200 configured to compensate for stiffness due to misalignments between a shaft 201 and an encoder 202. It should be understood that the stiffness compensation magnetic system 200 depicted in Figure 6 may include additional components and that some of the components described herein may be removed and / or modified without departing from the scope of the stiffness compensation magnetic system 200.
  • the encoder 202 comprises a body 203, a longitudinal hole 204 to receive the shaft 201, an elastic coupling device 205 and an annular bearing 206.
  • the annular bearing 206 and the elastic coupling device 205 are located in correspondence with the longitudinal hole 204 such that annular bearing 206 and elastic coupling device 205 surround shaft 201 when inserted into longitudinal hole 204.
  • Encoder 202 is also coupled to static support 207.
  • the elastic coupling device 205 is configured to compensate for most of the reaction forces due to misalignments between the shaft 201 and the encoder 202.
  • the stiffness compensation magnetic system 200 comprises a rotor 208 coupled to the shaft 201 through the aperture 209, and a stator 210 that is coupled to the static support 207.
  • the stator 210 further comprises an annular channel 21 1 and a permanent magnet 212 mounted on the bottom wall 213 of the annular channel 21 1.
  • An annular portion of the rotor 208 is inserted into the annular channel 21 1 and is located in proximity to the permanent magnet 212.
  • the annular portion of the rotor 208, the bottom wall 213 and the side walls 214 of the stator 210 that define the annular channel 21 1 are made of a ferromagnetic material, for example, iron.
  • stator 210 and rotor 208 can also be made of the same ferromagnetic material or can be made of any other material that is capable of providing sufficient strength to the stiffness-compensating magnetic system 200 to withstand the forces generated within it.
  • Rotor 208 interacts with the magnetic field generated by permanent magnet 212 of stator 210 to compensate for residual forces generated within elastic coupling device 205 due to misalignment between shaft 201 and encoder 202.
  • Figures 7A and 7B show two graphs corresponding to the results of a no spin test and a spin test of a stiffness compensation magnetic system that is installed on an angle calibration bench.
  • an angle calibration bench can refer to a bench specifically designed to perform the test and Angle calibration of an angle encoder like the one shown in Figure 6.
  • the angle calibration bench can include angle encoders which are electromechanical devices that convert the angular position or movement of an axis or the axis itself into analog or digital output signals .
  • Table 1 shows the behavior of the elastic coupling device working alone (measured) versus the behavior of the compensation assembly that includes the stiffness compensation magnetic system and the elastic coupling device (theoretical).
  • the crosstalk between degrees of freedom (DOF) is negligible.
  • the experimental validation of the mentioned theoretical results has been carried out with the stiffness compensation magnetic system installed in the angular calibration bench, measuring the radial displacement of the aerostatic bearing under the forces due to misalignment.
  • the displacement is proportional to the applied forces and inversely proportional to the stiffness of the hot air bearing.
  • the angle calibration bench includes a multi-head angle encoder.
  • Figure 7A shows the displacement in the rotary table non-rotating test with and without the stiffness compensation magnetic system down to ⁇ 0.4 mm misalignment.
  • the observed displacements and associated reactions are reduced by up to 85%, from ⁇ 800nm to ⁇ 120nm.
  • the stiffness compensation magnetic system is based on stiffness negative of a passive magnetic system that is adjusted to cancel the stiffness of the elastic coupling in radial and flexural degrees of freedom (DOF)

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)

Abstract

L'invention concerne un dispositif magnétique de compensation de rigidité qui comprend un rotor pouvant être raccordé à un premier élément et un stator pouvant être raccordé à un deuxième élément. Le stator comprend un canal annulaire et au moins un aimant permanent monté sur une paroi inférieur du canal annulaire. Le rotor est partiellement inséré dans le canal annulaire et situé à proximité du ou des aimants permanents. Le canal annulaire et au moins la partie du rotor insérée dans le canal annulaire sont constitués d'un matériau ferromagnétique. Le rotor est conçu pour interagir avec un champ magnétique généré par le ou les aimants permanents pour compenser les forces générées à l'intérieur d'un dispositif d'accouplement élastique qui raccorde le premier élément et le deuxième élément, les forces générées étant dues à un désalignement entre le premier élément et le deuxième élément.
PCT/ES2019/070380 2019-06-04 2019-06-04 Système magnétique de compensation de rigidité WO2020245474A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/ES2019/070380 WO2020245474A1 (fr) 2019-06-04 2019-06-04 Système magnétique de compensation de rigidité

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Application Number Priority Date Filing Date Title
PCT/ES2019/070380 WO2020245474A1 (fr) 2019-06-04 2019-06-04 Système magnétique de compensation de rigidité

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4763764A (en) * 1987-06-12 1988-08-16 General Motors Corporation Wrapped spring, overrunning clutch assembly
DE102007028905B3 (de) * 2007-06-22 2008-12-11 Siemens Ag Lagereinrichtung zur berührungsfreien Lagerung eines Rotors gegen einen Stator
EP2818386A1 (fr) * 2012-02-24 2014-12-31 Kayaba Industry Co., Ltd. Dispositif de direction assistée électrique et appareil d'accouplement d'arbres utilisé dans celui-ci
EP3358121A1 (fr) * 2017-02-06 2018-08-08 Hunter Douglas Inc. Procédés et appareil pour réduire le bruit dans des ensembles de moteur

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4763764A (en) * 1987-06-12 1988-08-16 General Motors Corporation Wrapped spring, overrunning clutch assembly
DE102007028905B3 (de) * 2007-06-22 2008-12-11 Siemens Ag Lagereinrichtung zur berührungsfreien Lagerung eines Rotors gegen einen Stator
EP2818386A1 (fr) * 2012-02-24 2014-12-31 Kayaba Industry Co., Ltd. Dispositif de direction assistée électrique et appareil d'accouplement d'arbres utilisé dans celui-ci
EP3358121A1 (fr) * 2017-02-06 2018-08-08 Hunter Douglas Inc. Procédés et appareil pour réduire le bruit dans des ensembles de moteur

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