Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
  • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
  • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
  • F04C18/023—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where both members are moving
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
  • B60C23/02—Signalling devices actuated by tyre pressure
  • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
  • B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
  • B60C23/041—Means for supplying power to the signal- transmitting means on the wheel
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2230/00—Manufacture
  • F04C2230/10—Manufacture by removing material
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2240/00—Components
  • F04C2240/40—Electric motor
  • F04C2240/401—Linear motor
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2240/00—Components
  • F04C2240/80—Other components
  • F04C2240/81—Sensor, e.g. electronic sensor for control or monitoring
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2270/00—Control; Monitoring or safety arrangements
  • F04C2270/15—Resonance
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
  • F04C23/02—Pumps characterised by combination with or adaptation to specific driving engines or motors
• • 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
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49229—Prime mover or fluid pump making
  • Y10T29/49236—Fluid pump or compressor making
  • Y10T29/4924—Scroll or peristaltic type

Definitions

• the invention relates to a wheel.
• the wheels equip vehicles such as motor vehicles.
• Known wheels are equipped with a tire and an electrical device that needs to be powered to operate
• the electrical device is a sensor of the pressure difference between a confined gas under pressure inside the tire and the free air present outside the tire. Such a sensor makes it possible to signal to the driver a wheel insufficiently inflated or punctured.
• the invention aims to solve this problem. It therefore relates to a wheel in which the device comprises a system for transforming the pressure difference between the confined gas under pressure inside the tire and the free air present outside the tire in electrical energy used to power the electrical device.
• Embodiments of this wheel may include one or more of the following features: B the system is equipped with:
• At least one articulated arm displaceable under the action of the gas that expands when flowing from the inlet nozzle to the outlet nozzle, and An electromechanical transducer capable of converting the mechanical energy of movement of the arm into electrical energy used to power the sensor;
• the wheel comprises a bottleneck adapted to limit the flow of gas flowing from the inlet nozzle to the outlet nozzle to less than 10 "5 m 3 / s or 10 " 6 m 3 / s;
• the outlet nozzle is fluidly connected to the outside air of the tire by a hole adapted to limit the flow of gas that escapes out to less than 10 "8 m 3 / s;
• the electronic device is a sensor of the pressure difference between the confined gas under pressure inside the tire and the free air present outside the tire;
• B the transducer is capable of converting the mechanical energy of displacement of the arm into an electrical energy that can be used in addition as a physical quantity representative of the pressure difference;
• B the sensor comprises a wireless transmitter capable of transmitting a quantity representative of the pressure difference measured at a remote receiver via a wireless link, this transmitter being powered solely from the electrical energy produced by the system;
• B the system comprises at least two articulated arms between which flows the fluid to pass from the inlet nozzle to the outlet nozzle by moving these arms relative to each other, these arms being shaped and articulated from so that, during their movement, they define at least one fluid pocket which moves away from the inlet nozzle to then join the outlet nozzle while increasing volume at the same time;
• B the arms are shaped spirals nested one inside the other;
• the electrical device is a sensor of the pressure difference between the confined gas under pressure inside the tire and the free air present outside the tire and the transformation system is different from a microsystem equipped with two articulated arms between which flows the fluid to pass from the inlet nozzle to the outlet nozzle by moving these arms relative to each other, these arms being spirally shaped and articulated so that, during their movement, they define at least one fluid pocket that moves away from the inlet nozzle to then join the outlet nozzle while increasing volume at the same time.
• FIG. 1 is an illustration in partial section of a wheel incorporating an electrical device
• FIG. 2 is a more detailed schematic illustration of the electronic device of FIG. 1,
• FIG. 3 is a schematic illustration of the device of FIG. 1 in the case where the latter is a pressure difference sensor
• FIG. 4 is a schematic and sectional illustration of a valve of the wheel of the FIG. 1,
• FIG. 5 is a schematic diagram of a microsystem for transforming a pressure difference in a fluid in mechanical displacement
• FIG. 6 is a graph showing the arm movement of the microsystem of FIG. 5 as a function of time
• FIG. 7 is a schematic illustration of the operation of the microsystem of FIG. 5,
• FIG. 8 is a schematic illustration of a possible embodiment of the microsystem of FIG. 5, and FIG. 9 is a flowchart of a method of manufacturing the microsystem of FIG. 5,
• FIGS. 10 to 12 are diagrammatic and cross-sectional illustrations of various steps in the manufacturing process of the microsystem of FIG. 5.
• FIG. 1 represents a wheel 110 equipped with:
• the compressed gas is the compressed air used to inflate the tire.
• other gases are usable to inflate the tire 112 such as nitrogen.
• the wheel 2 is for example the wheel of a motor vehicle such as a car.
• the tire 112 is mounted on a rim 114.
• the device 100 is located inside the tire 112 which serves as a protective envelope.
• Figure 2 shows in more detail the general architecture of the device 100.
• the device 100 comprises a system 200 for transforming the pressure difference between the confined air under pressure inside the tire 112 and the free air present outside this tire with electrical energy. Free air is at atmospheric pressure. This electrical energy is used to power a set 202 of electrical components of the device 100.
• the assembly 202 includes both electrical components that are necessary for the system 200 to operate as other electrical components necessary for the performance of the various functions that the device 100 must perform.
• the assembly 202 comprises a wireless information transceiver as well as an electronic control unit.
• the system 200 comprises: a transducer 204 capable of converting the pressure difference between the confined air and the free air into mechanical energy, and
• transducer 206 capable of converting this mechanical energy into electrical energy used to power the assembly 202.
• the transducer 204 comprises an inlet nozzle 208 fluidly connected to the air confined inside the tire 112 and an outlet nozzle 210 fluidically connected to the open air.
• At least one of the nozzles 208 or 210 forms a bottleneck 212 adapted to limit the flow of air through the transducer 204.
• This neck 212 is shaped so that the air flow is very low, that is to say less than 100 mL / s, 10 mL / s or 1 mL / s.
• the neck 212 is shaped to allow only an air flow rate of less than 100 .mu.l / s and, preferably, less than or equal to 10.
• the leakage made through the tire 112 by the transducer 204 represents for a tire whose air volume is equal to 3.94 ⁇ 10 -2 m 3 a drop of pressure of 8 mBar after six months, which is negligible.
• the device 100 is able to operate for more than six months without forcing the owner of the vehicle to inflate the tire 112.
• the transducer 204 comprises between the nozzles 208 and 210 at least one movable arm under the action of the air which expands flowing from the nozzle 208 to the nozzle 210.
• the part that moves under the action of the air that relaxes is a turbine 216 formed of a central core 218 and several peripheral blades 220.
• Each blade 220 here corresponds to a movable arm. This turbine is rotated by the air flowing from the nozzle 208 to the nozzle 210.
• the system 200 is a microsystem.
• the microsystems are, for example, MEMS (Micro-ElectroMechanical Systems). These microsystems differ from macroscopic mechanical systems in addition to their manufacturing process. These microsystems are made using the same collective manufacturing processes as those used to make microelectronic chips. For example, microsystems are made from monocrystalline silicon wafer or machined glass by photolithography and etching (for example DRIE (Deep Reactive Ion Etching)) and / or structured by epitaxial growth and deposition of metallic material.
• DRIE Deep Reactive Ion Etching
• the microsystems are small and generally have parts or parts of machined parts of which at least one of the dimensions is of micrometric order.
• the micrometric order dimension is generally less than 200 ⁇ m and, for example, between 1 and 200 ⁇ m.
• transducers 204 and 206 are possible.
• embodiments of embodiments with a single oscillating arm are described, for example, in the patent applications WO 03 05 6691 and
• transducers 204 and 206 are also described below with reference to FIGS. 5 to 8.
• Figure 3 shows the device 100 in the particular case where it is a sensor of the pressure difference between the confined air under pressure inside the tire 112 and the air outside the outside of this tire.
• the device 100 exploits the fact that the pressure difference between the nozzles 208 and 210 is a function, for example proportional, to the mechanical energy produced by the movements of the arm or the transducer 204.
• the electrical energy produced by the transducer 206 is a function of the mechanical energy received, this electrical energy is also a function of the pressure difference between the nozzles 208 and 210. It is this property of the system
• the assembly 202 comprises: a device 26 for storing the electrical energy generated by the system 200, such as a capacitor,
• circuit 102 for managing the charging and discharging of the device 26,
• a radio transmitter 104 capable of communicating information representative of the pressure difference between the nozzles 208 and 210 to a remote radio receiver.
• the device 100 triggers the sending of a characteristic signal via the transmitter 104 as soon as the load of the device 26 exceeds a predetermined threshold FL
• the time that elapses between two transmissions is a function, for example proportional, to the measured pressure difference. It is therefore possible from the data received to deduce the difference in pressure between the nozzles 208 and 210.
• the device 100 does not need other external power sources to operate. Indeed, it uses only as a source of energy the pressure difference that exists between the nozzles 208 and 210. Under these conditions, it is said that the device 100 is autonomous in energy since it does not need to other sources of energy than that extracted from the pressure difference.
• Figure 4 shows a possible example of mounting the device 100 inside the tire 112. More specifically, the tire 112 has a valve 116 through which the wheel 110 can be inflated. Conventionally, this valve consists of a barrel 118 fixed without any degree of freedom to the tire 112 and a movable valve 120.
• This valve 120 is movable between a rest position in which it hermetically seals the tire and an active position in which it allows the introduction of compressed air inside the tire 112.
• a hole 124 is hollowed through the valve 120 to allow the passage of the nozzle 210 through the valve 120 and thus the connect to outside air.
• the device 100 is fixed without any degree of freedom to the valve 120.
• the compressed air leaks through the device 100 and the hole 124.
• the flow rate of the air leak is very low, that is to say less than 1 mL / s.
• the hole 124 is dimensioned so as to allow air leakage only less than 100 .mu.l / s and, preferably, less than or equal to 10 .mu.l / s.
• FIG. 5 represents a particular case of a microsystem 2 for transforming a pressure difference in a fluid in mechanical displacement. This microsystem 2 can be used as a system 200 in the embodiments described with reference to FIGS. 1 to 4.
• the microsystem 2 comprises a closed enclosure 4 fluidically connected to the compressed fluid via an inlet nozzle 6 and fluidically connected to the expanded fluid via an outlet nozzle 8.
• the enclosure 4 is hermetically sealed so that the fluid expanded in this enclosure can not escape through Other outlets than the nozzle 8.
• the nozzle 6 is fluidly connected to a roller expander 10.
• the roller expander is also known as the "Scroll" expander.
• the expander 10 is formed of two arms articulated with respect to each other 12 and 14.
• the arms 12 and 14 are shaped and articulated so that during their movement under the effect of the fluid admitted by the nozzle 6, they define at least one fluid pocket which moves away from the nozzle 6 to then approach the nozzle 8 while increasing volume.
• the arms 12 and 14 are spiral shaped and nested within each other. Each spiral has at least one turn or several turns to define several fluid pockets that move at the same time from the nozzle 6 to the nozzle 8.
• Each arm is mechanically connected via respective hinges 16 and 18 to a plane fixed 20 ( Figure 8). To simplify FIG. 5, only anchor points 21 at plane 20 are shown in this figure.
• the plane 20 extends parallel to orthogonal X and Y directions.
• the joints 16 and 18 are elastic.
• the joints 16 and 18 allow only a translational movement of the arms 12 and 14 along, respectively, Y and X directions.
• Each arm 12, 14 is also mechanically connected to a respective electromechanical transducer 22, 24.
• Each electromechanical transducer is adapted to convert the mechanical movement of the arm into electrical energy.
• each of these transducers 22, 24 is connected at the output to an electrical energy storage device such as the device 26 ( Figure 3).
• Transducers 22 and 24 are electromechanical transducers controllable so as to adjust the amount of mechanical energy converted into electrical energy. They therefore also fulfill the function of controllable damper.
• transducers 22 and 24 are controlled by a control unit such as the unit 28 ( Figure 3).
• the unit 28 is here connected to sensors 30 and 32 of a physical quantity representative of the electrical power produced, respectively, by the transducers 24 and 22.
• the sensors 30 and 32 also make it possible to measure the phase of the electrical power produced. .
• a mechanical phase shifter 36 is mechanically connected between the arms 12 and 14. This function of the phase shifter is to help mechanically to achieve a phase shift of ⁇ / 2 radians between the movements of oscillations (back and forth )
• this phase shifter 36 is formed by a spring 38 mechanically connected to the arms 12 and 14.
• this spring 38 is a spring blade. This spring 38 transforms the system formed by the two arms 12 and 14 and the spring 38 into a resonant system for a resonance frequency. The resonance frequency is reached when the phase difference between the oscillations movements of the arms 12, 14 is ⁇ / 2 radians. At the resonant frequency, the energy efficiency of the microsystem is maximal.
• the unit 28 is able to control the transducers 22 and 24 to work at the resonant frequency. For example, on the basis of the information measured by the sensors 30 and 32, the unit 28 calculates the phase difference between the oscillation movements of the arms 12 and 14 and locks this phase shift on the value ⁇ / 2. To limit the energy consumed by the microsystem 2 during its operation, the unit 28 is itself powered from the electrical energy produced by the transducers 22 and 24. For this purpose, for example, the unit 28 is electrically connected to the device 26 for storing electrical energy.
• FIG. 6 represents the evolution over time of displacements of the arms 12 and 14, respectively, along the directions Y and X. More specifically, the curves 44 and 46 represent the displacements, respectively, of the arms 12 and 14. These displacements are sinusoidal and out of phase with respect to each other by ⁇ / 2 radians.
• each arm In steady state, each arm describes a movement of oscillations or back and forth between two extreme positions noted X ma ⁇ and X mn for the arm 14 and Y max and Ymin for the arm 12 in Figure 2 .
• the displacement of the arms 12, 14 defines a plurality of fluid pockets that moves circularly from the nozzle 6 to the nozzle 8 by increasing volume. Specifically, each fluid pocket moves around and at the same time away from the nozzle 6.
• FIG. 7 shows in more detail the displacement of a pocket 50 of fluid from the nozzle 6 towards the nozzle 8.
• the pocket 50 moves from the nozzle 6 to the nozzle 8 by describing a spiral movement around the nozzle 6. More precisely, after the arms 12 and 14 have each performed a complete back and forth, the pocket 50 has moved from the position shown in the state I to the position 52 represented in the state I. It has therefore performed a complete turn around the nozzle 6.
• the pocket 50 makes a new turn around the nozzle 6 but moving away a little more from it. More precisely, after a complete new turn, the pocket 50 occupies the position 54 (state I). Finally, during his last turn, the pocket 50 occupies the position 56 (state I). In the state 56, the bag is in fluid communication with the nozzle 8, allowing the expanded fluid to escape.
• the arms 12 and 14 are shaped to simultaneously define at least two pockets that move at the same time from the nozzle 6 to the nozzle 8 by increasing volume.
• the arms 12 and 14 are shaped to define six fluid pockets that move simultaneously from the nozzle 6 to the nozzle 8.
• the energy of this trigger is converted into a mechanical movement of the arms 12 and 14.
• this mechanical displacement is converted by the transducers 22 and 24 into electrical energy.
• FIG. 8 represents an example of possible implementation of the microsystem 2.
• the hinge 16 and the transducer 22 are identical, in the near position, the hinge 18 and the transducer 24. Thus, only the hinge 16 and the transducer 22 are described here in more detail.
• the hinge 16 is here made using a parallelogram 60 fixed without any degree of freedom to the arm 12.
• This parallelogram 60 thus moves in translation along the Y direction parallel to the plane 20.
• the parallelogram 60 is mechanically connected to the plane 20 via beams 62.
• Each beam 62 has a fixed end without any degree of freedom to the parallelogram 60 and another end fixed to the anchor point 21 itself fixed without any degree of freedom in the plane 20.
• the beam 62 is not directly fixed to the plane 20.
• each beam 62 is extending parallel to the direction X.
• each beam 62 is thin enough to be twisted when the fluid is relaxes in the pockets defined between the arms 12 and 14. With this configuration, the arm 12 can only move along the Y direction.
• the transducer 22 uses for example a capacitor with variable capacitance. iable to transform the mechanical energy produced by the movement of the arm 12 into electrical energy.
• the conversion of mechanical energy into electrical energy using variable capacitors is well known. For example, this is used in patent applications WO2007 082 894 and FR2 897 486. Thus, this conversion mechanism will not be described in detail.
• the capacitor is made using interdigitated combs. More specifically, an armature 66 of the capacitor is fixed without any degree of freedom to the parallelogram 60. The other armature 68 of this capacitor is fixed without any degree of freedom on the plane 20. Thus, when the parallelogram 60 moves, it modifies the capacity of the capacitor, which is then used to transform mechanical energy into electrical energy.
• At least one of the capacitor plates comprises electrets. Indeed, this allows the transducer 22 to begin to produce electrical energy without prior input of electrical energy from a source of external electrical energy.
• An exemplary method of manufacturing the microsystem 2 will now be described with reference to the method of Figure 9 and with the aid of the illustrations of Figures 10 to 12.
• a plate comprising a sacrificial intermediate layer 82 is etched.
• this plate is a SOI (Silicone On Insulator) plate.
• this plate comprises in addition to the sacrificial layer 82 on one side a silicon layer 84 and on the other side a layer of insulator 86.
• the spirals, the joints and the capacitor to variable capacitance are etched in the layer 84.
• the microsystem thus etched is represented by a block 90.
• the block 90 rests on the layer 82.
• the layer 82 is removed below the block 90.
• etching is used to remove the sacrificial layer. From this moment, the spirals 12 and 14 and the parallelograms of the joints as well as the armatures 66 of the capacitors with variable capacity can move in translation relative to the plane 20 constituted by the upper face of the layer 86 (see FIG. 11) .
• a cover 96 is made and this cover is assembled above the layer 84.
• the cover 96 is made of glass.
• the nozzles 6 and 8 are made in this cover 96. Only the nozzle 6 has been shown in FIG. 12.
• Access holes to the layer 84 are also made in the cover 96 for electrically connecting the transducers 22 and 24 to the control unit 28 and the energy storage device 26.
• Figure 12 only one hole 98 for access to layer 84 has been shown.
• the thickness of the layer 82 and the space between the cap 96 and the block 90 have been exaggerated in Figures 10 to 12.
• the thickness of the layer 82 and the space between the cover 96 and the block 90 are sufficiently reduced so that the fluid that expands in the expander 10 remains confined between the arms 12 and 14.
• the device 100 need not be autonomous. It can also use electrical energy produced by other energy sources such as a non-contact rechargeable battery using a device outside the wheel.
• the system 200 is combined with another system for producing electrical energy such as a system capable of transforming accelerations experienced by the wheel into electrical energy.
• the system 200 is not necessarily a microsystem. Alternatively, it is a macroscopic system.
• the electrical device is not necessarily a sensor of the pressure difference.
• it may be a tire adhesion sensor 112 on the road or a temperature sensor.
• the electrical device is not necessarily a sensor either.
• the assembly 202 may include a light or other indicator so as to allow the supply of this indicator light from the pressure difference between the air confined inside the tire and the open air.
• the arms 12 and 14 may be mechanically prestressed so that, whatever the position of these arms, there is always at least one elastic hinge which has a non-zero elongation, that is to say that it is is not at his rest position.
• Many different spiral shapes are possible for the arms
• it may be a volute or an Archimedean spiral.
• Each arm may have one or more spirals.
• the arms 12 and 14 are mounted in translation along perpendicular axes. In fact, it is sufficient that the axes along which the arms 12 and 14 move are non-parallel. If the angle between these axes is different from ⁇ / 2 radians, then the phase shift between the oscillation movements of the arms 12 and 14 must be adapted accordingly.
• the mechanical phase shifter 36 may be omitted.
• the predetermined phase shift between the movements of the arms can be provided by an electric actuator such as for example an electromechanical transducer.
• the mechanical phase shifter can also be achieved without resorting to a spring. For example, it can be achieved using a connecting rod mechanism and crank.
• the etching steps can be replaced by deposition steps.

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• 2009
  • 2009-05-25 FR FR0953412A patent/FR2945835B1/fr not_active Expired - Fee Related
• 2010
  • 2010-05-25 WO PCT/EP2010/057190 patent/WO2010136472A2/fr active Application Filing
  • 2010-05-25 JP JP2012512345A patent/JP5587988B2/ja not_active Expired - Fee Related
  • 2010-05-25 JP JP2012512346A patent/JP5718321B2/ja active Active
  • 2010-05-25 EP EP10724009A patent/EP2435705A2/de not_active Withdrawn
  • 2010-05-25 US US13/321,977 patent/US8764422B2/en active Active
  • 2010-05-25 US US13/322,017 patent/US8607627B2/en active Active
  • 2010-05-25 WO PCT/EP2010/057188 patent/WO2010136470A2/fr active Application Filing
  • 2010-05-25 EP EP10724011.1A patent/EP2435706B1/de active Active

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