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WO2007062730A1 - Ecrous pour vis et boulons fortement sollicites - Google Patents

Ecrous pour vis et boulons fortement sollicites Download PDF

Info

Publication number
WO2007062730A1
WO2007062730A1 PCT/EP2006/010617 EP2006010617W WO2007062730A1 WO 2007062730 A1 WO2007062730 A1 WO 2007062730A1 EP 2006010617 W EP2006010617 W EP 2006010617W WO 2007062730 A1 WO2007062730 A1 WO 2007062730A1
Authority
WO
WIPO (PCT)
Prior art keywords
nut
thread
bearing surface
force
measuring device
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.)
Ceased
Application number
PCT/EP2006/010617
Other languages
German (de)
English (en)
Inventor
Jörg Hohmann
Frank Hohmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO2007062730A1 publication Critical patent/WO2007062730A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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

Definitions

  • the invention relates to a nut for heavily loaded screws and bolts.
  • Standard washers have an outer diameter that corresponds to the corner dimension of a standard nut. This results in a larger bearing surface than in the use of only a hex nut, the Anflambaungen are inscribed in a circle with the diameter of the corner measure.
  • Both the commercially produced nuts and the washers used therewith are manufactured with relatively large tolerances with respect to the angle of the bearing surface of the nut to the thread axis and with respect to the parallelism of the bearing surfaces of the washers.
  • the threaded bolt to be clamped can be pierced along its entire length, and a dipstick can be inserted into this bore, the length of which should essentially correspond to the threaded bolt length and which does not participate in the elongation of the threaded bolt, so that the elongation of the threaded bolt results from the difference in length between the dipstick and the threaded bolt.
  • a measuring method which consists in determining the threaded bolt expansion from the measured nut rotation angle, since there is a constant relationship between the nut rotation angle and the threaded bolt expansion due to the respective thread pitch.
  • this measuring method it is necessary to first screw the nut until the play-free setting of all components to be clamped by the threaded bolt and to consider only the nut rotation angle from the thus determined joining point.
  • the two known measuring methods make it possible to determine the threaded bolt expansion due to the pressurization of the hydraulic threaded bolt tensioning device with sufficient accuracy and to automate the tightening of large screws largely, but require an increased expenditure on equipment.
  • the invention is based on the object to provide a nut for heavy-duty screws, which replaces a standard hexagon optionally in conjunction with a standard washer, has no major space and is easy and inexpensive to manufacture and direct measurement of remaining, effective bias force allowed.
  • a nut for highly loaded screws and bolts is proposed according to the invention a cylindrical portion with a diameter approximately equal to the corner of a standard hex nut for the respective thread diameter, a support surface, by machining the thread and this support surface in a single clamping runs exactly perpendicular to the thread axis, an embodiment of the thread for distributing the power transmission to a plurality of threads, starting from the support surface in such a way that the nut thread is rotated at a distance of at least one thread from the support surface and / or more directed to the bearing surface threads
  • Muttemgewindes are turned out conical, arranged on the bearing surface facing away from the end of the cylindrical portion training for positive engagement of a nut turning tool, and integrated into the cylindrical portion e, preferably adjacent to the support surface arranged, the bearing force of the nut and thus the screw biasing force measuring force measuring device comprises.
  • the cylindrical portion having a diameter approximately equal to the corner of a standard hex nut for the respective thread diameter mother of the invention requires no more space than a standard hex nut, but has a larger contact surface, whereby the surface pressure is reduced to the base material. Furthermore, the nut is inherently stiffer than a standard hexagon nut of the same size, which results in a lower setting loss during clamping.
  • the distribution of power transmission to several threads, starting from the support surface can be done in different ways.
  • a very simple means is to turn the nut thread, starting from the support surface at a distance of at least one thread turn.
  • Another possibility may be to turn out some conically directed to the bearing surface threads of the nut thread, starting from the bearing surface, tapering tapered.
  • the integrated into the cylindrical portion of the nut force measuring device allows to measure the bearing force of the nut and thus the screw biasing force.
  • this force measuring device directly measures the effective preload force remaining after setting all the elements of the bolted joint. If the screw connection is applied in the usual way by turning the nut, the screw clamping force arising during turning can also be measured continuously. By far it is possible to repeatedly or continuously measure the remaining effective biasing force with a time interval, whereby a decrease in the biasing force can be seen and take appropriate measures to prevent failure of the screw connection.
  • the nut may be provided with a wireless output for the force measuring device, via which a connection to an external measured value conversion and display device can be established. This connection only works if the external measured value conversion and display device falls within the wireless range
  • Output of the force measuring device is brought. If a continuous measurement of the biasing force is desired, it is advantageous to form the output of the force measuring device as a plug connection, by means of which a cable connection to the external measured value conversion and display device can be produced.
  • all nuts can be connected via such a cable connection with a central Meßwertumsetz- and -an Selfevorraum that continuously performs the measurements, logs and optionally generates a message when the biasing force of individual or all screw connections change over time in a security impairing way.
  • the overall height of the nut according to the invention may at least approximately correspond to the height of a standard hex nut, preferably approximately the height of a standard hex nut for the respective thread diameter plus the thickness of a corresponding standard washer.
  • the space of the nut according to the invention is not greater than that of a standard hexagon nut in conjunction with a standard washer, however, the mother of the invention can be much higher load for clamping highly loaded screws and bolts, as a distribution of the load to a larger number Threading occurs and the mother due to the cylindrical portion has a significantly higher stiffness than an equally sized standard hex nut.
  • the nut according to the invention can be used according to the invention and preferably for tightening highly stressed screws by means of a hydraulic screw clamping cylinder.
  • a hydraulic screw tensioning cylinder is described in DE 196 38 901 A1 the same applicant. Due to the design in the upper area of the nut as a hexagon or multi-tooth, the suit is also possible with standard manual or hydraulic wrenches.
  • the invention will be described by way of example with reference to a sectional view of the nut according to the invention shown in the drawing.
  • the nut according to the invention consists of a cylindrical portion 1 whose outer diameter corresponds to the corner of a standard hex nut for the same thread diameter.
  • the nut is provided with a support surface 2 which extends as accurately as possible perpendicular to the axis 3 of the nut of its internal thread 4. This exactly vertical course of the support surface 2 with respect to the axis 3 is achieved in that the processing of the nut thread 4 and the support surface 2 are carried out in one clamping.
  • the nut thread 4 adjacent to the bearing surface 2 be provided with a recess 6 whose axial height corresponds at least approximately to a thread. Furthermore, it is possible to achieve a distribution of the power transmission to a plurality of threads by a tapered recess 7 of the bearing surface 2 directed towards the threads.
  • the recess 6 and the tapered recess 7 are combined.
  • the total height H of the nut according to the invention may at least approximately correspond to the height of a standard hex nut for the respective thread diameter, but should preferably approximately correspond to the height of a standard hex nut for the respective thread diameter plus the thickness of a corresponding standard washer, while the amount of training 5 should amount to the positive engagement of a Muttemwindtechnikmaschines not more than a third of the total height H of the mother according to the invention.
  • a force measuring device 8 Adjacent to the bearing surface 2 of the nut, a force measuring device 8 is integrated in the cylindrical region 1, which measures the bearing force of the nut and thus the bolt prestressing force.
  • This force measuring device 8 can be designed in different ways. It can act inductively or capacitively, consist of a resistance measuring bridge with expansion strips or of a piezoelectric element.
  • an output 9 for the force measuring device 8 is arranged.
  • This output 9 may be formed as a plug connection, so that it can be connected to a cable 11, which is connected to an external Meßwertumsetz- and - display device 10.
  • Several provided with the force measuring device 8 nuts can be connected via such cable 11 with a central external Meßwertumsetz- and -an Selfevorraum 10, which makes an evaluation of the measurement signals from the various measuring points, logs and emits a signal, for example, if impermissible changes in the biasing force single or all screw connections result.
  • the output 9 can also be designed as a wireless output, in the vicinity of which the external measured value conversion and display device 10 can be brought to record case by case at each individual nuts the measured value of the screw biasing force.
  • This embodiment is particularly simple and advantageous when a single measurement of the screw biasing force after tightening the screw connection is sufficient.
  • a hydraulic screw tensioning cylinder according to DE 196 38 901 A1 of the same applicant is used for clamping a screw connection in conjunction with the nut according to the invention, a knurling of the cylindrical portion 1 is sufficient, since in this case the screw to be tensioned by the hydraulic screw tensioning cylinder to the predetermined length is stretched and the mother needs to be added only with little effort.
  • a friction wheel engaging in the knurling can be provided on the hydraulic bolt tensioning cylinder.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

L'invention concerne un écrou pour vis ou boulons fortement sollicités, qui présente une partie cylindrique (1) dont le diamètre correspond sensiblement au diamètre extérieur d'un écrou normalisé à six pans pour le diamètre correspondant du filet, une surface d'appui (2) qui s'étend, par usinage du filet (4) et de cette surface d'appui dans une fixation, en pratique exactement à la perpendiculaire de l'axe (3) du filet, et une configuration (6, 7) du filet, permettant de répartir le transfert des forces de la surface d'appui à plusieurs pas du filet, et à l'extrémité de la partie cylindrique non tournée vers la surface d'appui, une configuration (5) qui permet un engagement en correspondance géométrique avec un outil de rotation de l'écrou et un dispositif (8) de mesure de force intégré dans la partie cylindrique et qui mesure la force d'appui de l'écrou et donc la force de précontrainte de la vis.
PCT/EP2006/010617 2005-12-01 2006-11-07 Ecrous pour vis et boulons fortement sollicites Ceased WO2007062730A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510057665 DE102005057665B3 (de) 2005-12-01 2005-12-01 Mutter für hochbelastete Schrauben und Bolzen
DE102005057665.6 2005-12-01

Publications (1)

Publication Number Publication Date
WO2007062730A1 true WO2007062730A1 (fr) 2007-06-07

Family

ID=37685603

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/010617 Ceased WO2007062730A1 (fr) 2005-12-01 2006-11-07 Ecrous pour vis et boulons fortement sollicites

Country Status (2)

Country Link
DE (1) DE102005057665B3 (fr)
WO (1) WO2007062730A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011020454A1 (fr) 2009-08-20 2011-02-24 Neumayer Tekfor Holding Gmbh Dispositif de détermination et/ou de contrôle d'une force de précontrainte d'un assemblage par vis
DE102009043267A1 (de) 2009-09-29 2011-04-21 Neumayer Tekfor Holding Gmbh Verschraubungsmittel und System zur Überwachung einer Verschraubung
TWI495800B (zh) * 2013-03-06 2015-08-11 Kabo Tool Co A screw with a locking force
DE102015204976A1 (de) * 2015-03-19 2016-09-22 Bayerische Motoren Werke Aktiengesellschaft Messvorrichtung sowie Verwendung einer Messvorrichtung
US20230220868A1 (en) * 2019-08-04 2023-07-13 Revotec Zt Gmbh Screw nut
WO2024068392A1 (fr) * 2022-09-26 2024-04-04 Weidmüller Interface GmbH & Co. KG Écrou

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170175796A1 (en) * 2015-12-18 2017-06-22 General Electric Company Thread for improved fastener reliability
DE102017213801A1 (de) * 2017-08-08 2019-02-14 Zf Friedrichshafen Ag Messvorrichtung

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1124729B (de) * 1960-12-10 1962-03-01 Kistler Instrumente Ag Vorrichtung zum Messen der Kraefte zwischen Bauteilen
US3789726A (en) * 1972-05-22 1974-02-05 Gkn Screws Fasteners Ltd Load-indicating means for a nut and bolt assembly
DE2846668A1 (de) 1978-10-26 1980-06-04 Kraftwerk Union Ag Dehnungsmesseinrichtung fuer schraubenspannvorrichtungen, insbesondere bei reaktordruckbehaeltern
EP0766077A1 (fr) * 1995-09-29 1997-04-02 Electricite De France Capteur d'effort pour contrÔler le serrage de pièces assemblées par un goujon
DE19638901A1 (de) 1996-09-23 1998-03-26 Joerg Hohmann Hydraulische Gewindebolzenspannvorrichtung
US6250863B1 (en) * 2000-04-17 2001-06-26 Boris Kamentser Washer having stressed and unstressed strain gauges
DE10145847A1 (de) 2001-09-17 2003-04-17 Joerg Hohmann Hydraulische Gewindebolzenspannvorrichtung und Verfahren zum Anziehen von grossen Schrauben mittels der hydraulischen Gewindebolzenspannvorrichtung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3933074A (en) * 1974-12-09 1976-01-20 Kaynar Manufacturing Co., Inc. Fatigue improvement nut
DE2603996C2 (de) * 1976-02-03 1984-11-15 Helmut Hofmann Schrauben-Mutternkombination für hochfest vorgespannte Verbindungen
DE10001857A1 (de) * 2000-01-18 2001-07-19 Schatz Gmbh Verbindungselement in Form einer Schraube, Mutter oder Scheibe für eine Schraubverbindung, sowie Verfahren zu deren Festziehen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1124729B (de) * 1960-12-10 1962-03-01 Kistler Instrumente Ag Vorrichtung zum Messen der Kraefte zwischen Bauteilen
US3789726A (en) * 1972-05-22 1974-02-05 Gkn Screws Fasteners Ltd Load-indicating means for a nut and bolt assembly
DE2846668A1 (de) 1978-10-26 1980-06-04 Kraftwerk Union Ag Dehnungsmesseinrichtung fuer schraubenspannvorrichtungen, insbesondere bei reaktordruckbehaeltern
EP0766077A1 (fr) * 1995-09-29 1997-04-02 Electricite De France Capteur d'effort pour contrÔler le serrage de pièces assemblées par un goujon
DE19638901A1 (de) 1996-09-23 1998-03-26 Joerg Hohmann Hydraulische Gewindebolzenspannvorrichtung
US6250863B1 (en) * 2000-04-17 2001-06-26 Boris Kamentser Washer having stressed and unstressed strain gauges
DE10145847A1 (de) 2001-09-17 2003-04-17 Joerg Hohmann Hydraulische Gewindebolzenspannvorrichtung und Verfahren zum Anziehen von grossen Schrauben mittels der hydraulischen Gewindebolzenspannvorrichtung

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011020454A1 (fr) 2009-08-20 2011-02-24 Neumayer Tekfor Holding Gmbh Dispositif de détermination et/ou de contrôle d'une force de précontrainte d'un assemblage par vis
DE102009038211A1 (de) 2009-08-20 2011-03-03 Neumayer Tekfor Holding Gmbh Vorrichtung zur Bestimmung und/oder Überwachung einer Vorspannkraft einer Schraubverbindung
DE102009043267A1 (de) 2009-09-29 2011-04-21 Neumayer Tekfor Holding Gmbh Verschraubungsmittel und System zur Überwachung einer Verschraubung
TWI495800B (zh) * 2013-03-06 2015-08-11 Kabo Tool Co A screw with a locking force
DE102015204976A1 (de) * 2015-03-19 2016-09-22 Bayerische Motoren Werke Aktiengesellschaft Messvorrichtung sowie Verwendung einer Messvorrichtung
US20230220868A1 (en) * 2019-08-04 2023-07-13 Revotec Zt Gmbh Screw nut
WO2024068392A1 (fr) * 2022-09-26 2024-04-04 Weidmüller Interface GmbH & Co. KG Écrou

Also Published As

Publication number Publication date
DE102005057665B3 (de) 2007-08-09

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