EP4573295A1 - Vis d'assemblage instrumentee - Google Patents
Vis d'assemblage instrumenteeInfo
- Publication number
- EP4573295A1 EP4573295A1 EP23762257.6A EP23762257A EP4573295A1 EP 4573295 A1 EP4573295 A1 EP 4573295A1 EP 23762257 A EP23762257 A EP 23762257A EP 4573295 A1 EP4573295 A1 EP 4573295A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strain gauge
- tightening
- assembly screw
- screw
- threaded part
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
- F16B31/02—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
- F16B31/02—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load
- F16B2031/022—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load using an ultrasonic transducer
Definitions
- the present invention relates to the field of controlled tightening and more particularly that using manual tightening keys, such as torque wrenches with triggering or direct reading (mechanical or electronic).
- Controlling the tightening of screw elements can be implemented with different methods, namely by measuring the torque (tightening force), the angle of rotation (conversion of the elongation of the body of the screw with the pitch of the screw). thread) or the elongation of the screw.
- Angle tightening is widely used in the automotive industry. This can be implemented with a manual tightening wrench which includes means for measuring the tightening angle. Tightening to elongation is used for long screws, also called tensioning (manual, hydraulic, or thermal elongation method). Torque tightening is on the contrary the most used method, using either trigger keys or electronic keys and has the advantage of being simple to use. On the other hand, it has the major disadvantage that for a given tightening torque, the force on the screws and therefore the resulting mechanical deformation, varies greatly following the significant dispersion of the apparent coefficient of friction (threading, head support of the screw, face of the nut, brake...), twisting of the body of the screw....
- the main aim of the present invention is therefore to solve the aforementioned problem by allowing real-time knowledge of the value of the tightening torque.
- FIG. 1 illustrates an example of a tightening key 10 used for tightening an assembly screw 12 in order to assemble a first part 14 with a second part 16 tapped to receive the threaded part 12A of the assembly screw.
- a washer 18 is mounted between the head 12B of the assembly screw and the first part 14.
- the angle of rotation is measured by a measuring device 20 which comprises a clamping sleeve 20A cooperating with the head 12B of the screw d assembly and which measures the differential rotation between the socket 20A and the first part 14 by means of a spring 20B arranged around the external periphery of the socket, a Teflon® 20C tube, provided with a non-slip ring 20D, being interposed between the spring 20B and the upper surface of the first part 14.
- the Teflon® tube makes it possible to generate a low coefficient of friction between the moving parts so as not to affect the tightening torque.
- the non-threaded part 12C of the assembly screw 12 is provided with a strain gauge 22 and an RFID (Radio Frequency IDentification) tag 24 connected thereto. one to the other by a wired connection 26.
- the RFID tag is intended to cooperate remotely with an RFID reader 28, advantageously portable, comprising an antenna/RFID chip assembly 30 connected to a processing module 32 itself connected to a display 34 and/or a speaker.
- the display and/or the speaker can constitute an audible and/or light alert device for the operator in the event of loss of tightening.
- the assembly screw and RFID reader form a system for determining the tightening torque of an assembly screw comprising at least one threaded part and one non-threaded part in order to allow the wireless transmission of a resistance value electrical strain gauge representative of the stretching of this assembly screw.
- the strain gauge (an extensometer with resistant wires conventionally manufactured by a lithographic process from a metal sheet of a few microns and a polyamide type electrical insulator), is preferentially glued to this non-threaded part in order to detect any an instantaneous elongation resulting in a change in electrical resistance of the strain gauge.
- Stick-on resistive strain gauges particularly in single-direction traction, are known in the instrumentation community (characterized by size, resistance to heat/corrosive environment and bonding to different supports). However, the gauge could also be directly produced by printing directly on the barrel (non-threaded part) of the screw.
- the strain gauge and the RFID tag are connected by two measuring wires forming the wire connection 26.
- the wire connection is advantageously also printed. Placing the strain gauge on the barrel (its non-threaded part) of the assembly screw makes it possible to determine an electrical resistance value depending on the instantaneous elongation of this barrel, which value will be stored in the memory of the RFID chip and therefore can be read at any time by the RFID reader. Appropriate processing known in itself will allow the processing module 32 of the RFID reader to deduce the tightening torque from this value of the electrical resistance and present it to the operator on the display 34 of the RFID reader.
- active or passive, automatic feedback of information to the RFID reader can be considered, in particular with an audible and/or light alert in the event of loss of tightening at this reader.
- a code associated with the torque information will precisely designate the position of the screw in the bolted assembly.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
- Length-Measuring Instruments Using Mechanical Means (AREA)
- Measurement Of Force In General (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2208344A FR3138930B1 (fr) | 2022-08-17 | 2022-08-17 | Vis d’assemblage instrumentée |
| PCT/FR2023/051270 WO2024038235A1 (fr) | 2022-08-17 | 2023-08-16 | Vis d'assemblage instrumentee |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4573295A1 true EP4573295A1 (fr) | 2025-06-25 |
Family
ID=83506133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23762257.6A Pending EP4573295A1 (fr) | 2022-08-17 | 2023-08-16 | Vis d'assemblage instrumentee |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20260043431A1 (fr) |
| EP (1) | EP4573295A1 (fr) |
| CN (1) | CN119731440A (fr) |
| FR (1) | FR3138930B1 (fr) |
| WO (1) | WO2024038235A1 (fr) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2852879B1 (fr) | 2003-03-26 | 2007-04-06 | Snecma Moteurs | Cle a serrage controle |
| US7293466B2 (en) * | 2005-07-19 | 2007-11-13 | Hitachi, Ltd. | Bolt with function of measuring strain |
| JP2010053927A (ja) * | 2008-08-27 | 2010-03-11 | Asahi Electric Works Ltd | 締め付け装置およびその軸力検出システム |
| JP6324405B2 (ja) * | 2013-11-22 | 2018-05-16 | 株式会社サンノハシ | ボルト、ナット、および歪測定システム |
| WO2016185578A1 (fr) * | 2015-05-20 | 2016-11-24 | 株式会社サンノハシ | Boulon, dispositif de commande et système de mesure de distorsion |
| US10941802B2 (en) * | 2015-07-13 | 2021-03-09 | Silicon Valley Micro E Corp. | Intelligent washer |
| JP2022041452A (ja) * | 2020-09-01 | 2022-03-11 | 国立大学法人茨城大学 | ネジ、および、ネジの締め付け制御方法 |
-
2022
- 2022-08-17 FR FR2208344A patent/FR3138930B1/fr active Active
-
2023
- 2023-08-16 CN CN202380060164.0A patent/CN119731440A/zh active Pending
- 2023-08-16 US US19/103,687 patent/US20260043431A1/en active Pending
- 2023-08-16 WO PCT/FR2023/051270 patent/WO2024038235A1/fr not_active Ceased
- 2023-08-16 EP EP23762257.6A patent/EP4573295A1/fr active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024038235A1 (fr) | 2024-02-22 |
| FR3138930A1 (fr) | 2024-02-23 |
| US20260043431A1 (en) | 2026-02-12 |
| FR3138930B1 (fr) | 2024-09-13 |
| CN119731440A (zh) | 2025-03-28 |
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Legal Events
| Date | Code | Title | Description |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| 17P | Request for examination filed |
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| DAX | Request for extension of the european patent (deleted) | ||
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