EP3394585A1 - Dispositif de mesure d'un champ de pressions exercées par un pneumatique - Google Patents
Dispositif de mesure d'un champ de pressions exercées par un pneumatiqueInfo
- Publication number
- EP3394585A1 EP3394585A1 EP16826124.6A EP16826124A EP3394585A1 EP 3394585 A1 EP3394585 A1 EP 3394585A1 EP 16826124 A EP16826124 A EP 16826124A EP 3394585 A1 EP3394585 A1 EP 3394585A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- protective sheet
- sensor
- measuring
- less
- measuring sensor
- 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- Withdrawn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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
- G01M17/02—Tyres
- G01M17/021—Tyre supporting devices, e.g. chucks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/26—Auxiliary measures taken, or devices used, in connection with the measurement of force, e.g. for preventing influence of transverse components of force, for preventing overload
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/16—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force
- G01L5/161—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force using variations in ohmic resistance
- G01L5/162—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force using variations in ohmic resistance of piezoresistors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/16—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force
- G01L5/165—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force using variations in capacitance
Definitions
- the invention lies in the field of measuring the field of pressure exerted on the ground by a tire.
- the present invention more specifically relates to a device for measuring a pressure field exerted by a tire in the area of the measuring surface with which it is in contact.
- the measuring devices known from the state of the art comprise a plane support on which there is a pressure field measurement sensor, also plane, preferably of the piezoresistive or piezo-capacitive sensor type.
- a pressure field measurement sensor also plane, preferably of the piezoresistive or piezo-capacitive sensor type.
- the tire to be tested is then mounted on a test bench and applied against this measurement sensor, with a certain force that simulates the force that tire exerts on the roadway or the ground during its use.
- This force is exerted along an axis perpendicular to the contact surface of the tire with the ground.
- These measuring devices are suitable when the tire is tested at a standstill or when driving in a straight line.
- this protective sheet is simply fixed by two of its sides. As a result, it is not immobilized with respect to the sensor cells and may be degraded and creased when the tire applied to it is subjected to tensile and / or shear forces. This results in a poor transmission, to the cells of the sensor, of the measured pressure fields.
- the protective sheet is glued directly to the cells of the sensor. In this case, it is impossible to test the tire under braking, drift or camber conditions, since this would result in the destruction of the sensor cells secured to the protective sheet and thus subjected to the same traction forces and / or or shear.
- the invention therefore aims to solve the aforementioned drawbacks of the state of the art.
- the invention relates to a device for measuring a pressure field exerted by a tire in the area of the measuring surface with which it is in contact, this device comprising a plane support and a sensor for measuring this pressure field. disposed on said support.
- the object of the invention is to provide a measuring device as mentioned above, which is more resistant than the device known from the state of the art, which prevents the destruction of its measuring sensor and which does not significantly modify the resolution. of the sensor.
- this device comprises at least one sheet, called “protective sheet”, disposed on said measuring sensor and against the upper face of which the tire to be tested is intended to be applied, this protective sheet is a thickness of less than 1 mm, preferably less than 0.2 mm and is made of a material resistant to forces, in particular shearing and traction, generated in its plane, greater than or equal to 1000 N and less than or equal to 10.000 N, this protective sheet is disposed on said measuring sensor so as to be at contact thereof and to be immobilized relative thereto, and the protective sheet is prestressed so as to be tensioned on said measuring sensor.
- this protective sheet is a thickness of less than 1 mm, preferably less than 0.2 mm and is made of a material resistant to forces, in particular shearing and traction, generated in its plane, greater than or equal to 1000 N and less than or equal to 10.000 N
- this protective sheet is disposed on said measuring sensor so as to be at contact thereof and to be immobilized relative thereto, and the protective sheet is prestressed so
- this protective sheet makes it possible to protect the measurement sensor from the forces generated in the plane of friction, without significantly altering the resolution and the results of the measurements obtained by the sensor.
- the invention thus goes against a prejudice that the fact of inserting a protective sheet between a sensor and a tire prevents the sensor from operating or greatly disrupts the results obtained.
- said protective sheet is not secured to said measuring sensor
- said protective sheet is made of a metallic material, preferably stainless steel or a composite material based on carbon fibers or based on aromatic polyamide fibers;
- said protective sheet is covered with an electrically insulating sheet disposed between the sensor and said protective sheet and the sum of the thicknesses of the protective sheet and the electrically insulating sheet is less than 1 mm, preferably less than 0.2 mm;
- said protective sheet is preloaded at values greater than 0 N and less than or equal to 500 N;
- said protective sheet is prestressed by being wound at its two ends around a roller, at least one of these two rollers being a tensioning roller;
- the measuring sensor is a piezoresistive or piezo-capacitive sensor
- said measurement sensor has a resolution less than or equal to 5 mm 2 , preferably less than 2.5 mm 2 , more preferably less than or equal to 1 mm 2 ;
- the device comprises a central unit of a computer and the measurement sensor comprises a connection device allowing the connecting a power supply cable and a connection cable to said central unit.
- FIG. 1 is a schematic perspective view of the measuring device according to the invention and a tire being measured with this device, and
- FIG. 2 is a schematic vertical cross sectional view of the measuring device according to the invention.
- This measuring device 1 comprises a plane support 2 and a measurement sensor 3 disposed on this support 2.
- the support 2 is generally a measurement table but could also be the floor.
- the sensor 3 is preferably a piezoresistive or piezo-capacitive sensor.
- the senor 3 has a measuring panel 30, a connector member 31, which allows to connect the power supply and connection cables between the measurement panel and a central unit 32 of a computer.
- the measuring panel 30 preferably has a measurement surface greater than or equal to 5 cm by 5 cm.
- the tire P to be tested is mounted on a hub M of a test bench B. More specifically, this hub M is rotatably mounted about an axis of rotation YY 'with respect to the test bench B, and the tire is mounted on the hub M so that the central axis of this tire is coincident with the axis of rotation YY 'of the hub.
- the measuring device 1 has an axis longitudinal XX 'substantially perpendicular to the axis of rotation YY' of the hub and therefore of the tire.
- the measurement plate 30 is covered with a protective sheet 4.
- the measuring device 1 makes it possible to measure a field of the pressures exerted by a tire P in its area of contact with said protective sheet 4 covering the measurement sensor 3. It is considered that the results of these measurements correspond to the pressures exerted by the tire P when on the ground or the roadway.
- the protective sheet 4 is chosen so as to have a resistance to forces (in particular shear and traction) generated in its plane and greater than or equal to 1000 N and less than or equal to 10.000 N.
- the lower value makes it possible to guarantee that the protective sheet 4 will not be damaged during the tests currently carried out on the tires P.
- the upper value corresponds to the upper limit imposed by the measuring sensor 3 and beyond which this sensor would be destroyed.
- the forces are mainly shearing forces (arrows C), which are exerted in a direction parallel to the Y-Y 'axis to the left or to the right with respect to the tire P, forces of traction (arrows T), which are exerted in a direction perpendicular to the Y-Y axis "forwards or backwards and / or forces which correspond to the resultant of the aforesaid forces of shear and traction .
- This protective sheet 4 is placed on the measurement sensor 3, (and more precisely on the measurement plate 30), so that its lower face 41 is in contact with this slab 30. In addition, the sheet 4 is immobilized by relative to this slab 30, so that it can not slip and deviate from it.
- the tire P is intended to be applied against the upper face 42 of the sheet 4.
- this protective sheet 4 is prestressed, that is to say that it is tensioned on said measuring sensor 3, so as not to present folds. This prestressing remains however lower than the limit of elastic rupture of the protective sheet 4.
- this protective sheet 4 is not secured to the measuring sensor 3. It is for example not glued to it. Thus, when the tire exerts the aforementioned shearing and / or traction forces, it is this protective sheet 4 which supports said forces but which does not pass them on to the measuring sensor 3.
- this protective sheet 4 is made of a material chosen from metals, preferably stainless steel, or from a composite material based on carbon fibers or aromatic polyamides.
- the protective sheet 4 is made of an electrically insulating material. If this is not the case, this protective sheet 4 is then covered with an electrically insulating sheet interposed between the measurement plate 30 of the sensor and the protective sheet 4.
- the measuring sensor 3 used preferably has a resolution of less than 5 mm 2 , more preferably less than 2.5 mm 2 or better still close to 1 mm 2 .
- the protective sheet 4 should preferably have a thickness of less than 1 mm, more preferably less than 0.2 mm, so as to maintain the resolution of the sensor 3.
- the skilled person is able to determine the minimum thickness of the protective sheet depending on the selected material, so that it withstands forces generated in its plane greater than or equal to 1000 N and less than or equal to 10.000 N. Preferably, this thickness is greater than 0.01 mm.
- the protective sheet may be a metal strip of about 0.05 mm.
- rollers 51, 52 may be coated with a layer of elastomer sufficiently thick to maximize the maintenance of the protective sheet 4 and annihilate the flatness defects surfaces (eg machining tolerance, bending of the rollers under stress, etc. .).
- One of these rolls is for example fixed while the other may be a tensor roll.
- the roller 52 can be fixed, the protective sheet 4 being clamped between the roller and the support 2, while the roller 51 can be wound on itself so as to stretch the protective sheet 4 (arrow F ).
- the two rollers 51 and 52 may also be tensor rollers capable of being wound on themselves.
- the two opposite rollers 51, 52 may also be movable laterally so as to be spaced apart to tension the protective sheet 4.
- a tire P was mounted on the test stand and was applied against the protective sheet 4 and subjected to braking, drifting conditions at an angle of 15 ° and camber. This has generated forces in the plane of said protective sheet 4.
- the angle of drift is an angle formed in the plane of the protective sheet 4 relative to the longitudinal axis XX 'of the device 1 to the right or left of the latter following the pivoting of the hub M carrying the tire P.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1563130A FR3045823B1 (fr) | 2015-12-22 | 2015-12-22 | Dispositif de mesure d'un champ de pressions exercees par un pneumatique |
PCT/FR2016/053567 WO2017109377A1 (fr) | 2015-12-22 | 2016-12-20 | Dispositif de mesure d'un champ de pressions exercées par un pneumatique |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3394585A1 true EP3394585A1 (fr) | 2018-10-31 |
Family
ID=55346109
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16826124.6A Withdrawn EP3394585A1 (fr) | 2015-12-22 | 2016-12-20 | Dispositif de mesure d'un champ de pressions exercées par un pneumatique |
Country Status (6)
Country | Link |
---|---|
US (1) | US20180372589A1 (fr) |
EP (1) | EP3394585A1 (fr) |
JP (1) | JP2018538546A (fr) |
CN (1) | CN108700481A (fr) |
FR (1) | FR3045823B1 (fr) |
WO (1) | WO2017109377A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3132465B1 (fr) | 2022-02-04 | 2024-01-19 | Michelin & Cie | Pneumatique de compétition à montée rapide en température |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1849730A (en) * | 1927-05-04 | 1932-03-15 | Lulan S Morse | Tire pressure indicator |
IT1270194B (it) * | 1994-06-09 | 1997-04-29 | Pirelli | Dispositivo per rilevare la distribuzione della pressione specifica nell'area di impronta di un pneumatico per veicoli e metodo di rilevamento da esso attuato |
EP1417470A1 (fr) * | 2001-08-06 | 2004-05-12 | Société de Technologie Michelin | Methode de determination de composantes d'efforts subis par un pneumatique et du couple d'auto-alignement |
US6823728B1 (en) * | 2002-03-12 | 2004-11-30 | Elwood E. Barnes | Systems and methods for measurement of tire pressure |
CN2614961Y (zh) * | 2003-03-14 | 2004-05-12 | 朱剑波 | 汽车轮胎气压报警装置 |
JP4816095B2 (ja) * | 2006-01-20 | 2011-11-16 | 日産自動車株式会社 | タイヤ空気圧センサ取付構造およびタイヤホイール |
FR2950691B1 (fr) * | 2009-09-30 | 2012-05-04 | Michelin Soc Tech | Organe de mesure de pression etanche |
CN102815174A (zh) * | 2011-06-07 | 2012-12-12 | 无锡华润安盛科技有限公司 | 压力传感器、汽车轮胎压力监测***和压力传感器制造方法 |
-
2015
- 2015-12-22 FR FR1563130A patent/FR3045823B1/fr not_active Expired - Fee Related
-
2016
- 2016-12-20 US US16/065,388 patent/US20180372589A1/en not_active Abandoned
- 2016-12-20 WO PCT/FR2016/053567 patent/WO2017109377A1/fr unknown
- 2016-12-20 JP JP2018532758A patent/JP2018538546A/ja active Pending
- 2016-12-20 EP EP16826124.6A patent/EP3394585A1/fr not_active Withdrawn
- 2016-12-20 CN CN201680074948.9A patent/CN108700481A/zh active Pending
Also Published As
Publication number | Publication date |
---|---|
JP2018538546A (ja) | 2018-12-27 |
WO2017109377A1 (fr) | 2017-06-29 |
US20180372589A1 (en) | 2018-12-27 |
FR3045823B1 (fr) | 2017-12-08 |
CN108700481A (zh) | 2018-10-23 |
FR3045823A1 (fr) | 2017-06-23 |
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