WO2022145078A1 - Boulon anti-desserrage - Google Patents

Boulon anti-desserrage Download PDF

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Publication number
WO2022145078A1
WO2022145078A1 PCT/JP2021/024863 JP2021024863W WO2022145078A1 WO 2022145078 A1 WO2022145078 A1 WO 2022145078A1 JP 2021024863 W JP2021024863 W JP 2021024863W WO 2022145078 A1 WO2022145078 A1 WO 2022145078A1
Authority
WO
WIPO (PCT)
Prior art keywords
screw
flank surface
threaded portion
convex
end side
Prior art date
Application number
PCT/JP2021/024863
Other languages
English (en)
Japanese (ja)
Inventor
克彦 若林
Original Assignee
ハードロック工業株式会社
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 ハードロック工業株式会社 filed Critical ハードロック工業株式会社
Priority to JP2022572899A priority Critical patent/JP7424687B2/ja
Publication of WO2022145078A1 publication Critical patent/WO2022145078A1/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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B33/00—Features common to bolt and nut
    • F16B33/02—Shape of thread; Special thread-forms
    • 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
    • F16B39/00—Locking of screws, bolts or nuts
    • F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
    • F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
    • F16B39/30—Locking exclusively by special shape of the screw-thread

Definitions

  • the present invention relates to a locking bolt having a locking function.
  • male and female threads are formed with dimensional accuracy within the range of dimensional tolerances in line with required standards such as ISO standards.
  • the dimensional tolerances of the male and female threads are set so that the nut can be screwed to the screw shaft of the bolt.
  • the dimensional tolerances of male threads are, for example, JIS B0209-2: 2001 (ISO 965-2: 1998) 6g tolerance range class
  • the dimensional tolerances of female threads are, for example, JIS B0209-2: 2001 (ISO 965-2: 1998).
  • the bolt will loosen in a short time in a situation where the seat pressure intermittently disappears due to vibration.
  • Patent Document 1 discloses a technique in which a "hump 16" is provided on the flank surface of a female screw to eliminate play between the male screw and the female screw, thereby preventing loosening.
  • the flank surface of the male screw of the bolt shaft is composed of a top flank surface (13) having a gentler inclination than the female screw and a valley side flank surface (12) having a steeper inclination than the female screw.
  • Patent Document 3 a convex portion (9) is provided on the compression side flank at the end of the female screw of the nut, and the end of the female screw is deformed when the fastening is completed, so that the play side flank of the female screw becomes the play side flank of the male screw.
  • a technique for pressing and thereby preventing loosening is disclosed.
  • Patent Document 4 discloses a bolt for grounding for increasing the contact area with the nut in a state of being fastened to the nut and increasing the amount of current flowing through the fastening portion with the nut.
  • This grounding bolt has a ridge portion (18) formed on a flank surface (15a) on the head side of the thread.
  • Patent Document 5 discloses a technique for preventing loosening by providing a convex curved surface on a compression flank of a male screw or a female screw.
  • the screw thread is formed in an inclined shape, and when the fastening is completed, the screw thread is deformed so that not only the compression side flank surfaces but also the play side flank surfaces are brought into contact with each other to prevent loosening.
  • the technology to be performed is disclosed.
  • the locking bolt according to the present disclosure has a screw shaft in which a male screw is formed on the outer peripheral surface so as to be screwed into a screw hole having a female screw.
  • the male screw includes an R screw portion located in the middle of the screw shaft in the axial direction and a tip side screw portion located on the tip side in the axial direction with respect to the R screw portion.
  • At least one of the compression-side flank surface and the play-side flank surface of the R-thread portion is in contact with each other so that there is no play with respect to the female screw (that is, the R-thread portion of the male screw and the compression-side flank surface of the female screw are in contact with each other, and It may have a convex flank surface portion having a convex arc shape in a cross section along the axial direction (so that the R thread portion of the male screw and the play side flank surface of the female screw come into contact with each other).
  • the convex flank surface portion may be continuous in a spiral shape over at least 1/2 pitch of the male screw.
  • the entire compression side flank surface of the R thread portion may be the convex flank surface portion.
  • the entire play-side flank surface of the R screw portion may be the convex flank surface portion.
  • the tip-side threaded portion does not have the convex flank surface portion.
  • the tip side screw portion of the male screw and the compression side flank surface of the female screw come into contact with each other, but between the tip side screw portion of the male screw and the play side flank surface of the female screw.
  • a gap is formed.
  • the threaded portion on the tip side may be designed according to a general standard, for example, a reference thread shape specified in JIS B 0205-1.
  • the compression side flank surface and the play side flank surface of the tip side threaded portion may be flat in a cross section along the axial direction of the bolt, or may be concave.
  • the convex flank surface portion of the R thread portion can be designed so as to slightly protrude outward in the radial direction from the dimensional tolerance of the reference mountain shape. According to the loosening prevention bolt of the present invention, the screw portion on the tip side can be smoothly screwed into the screw hole at the initial stage of the bolt fastening work.
  • the convex flank surface portion of the R screw portion may be spirally continuous over at least 3/4 pitch of the male screw, or may be spirally continuous over at least one pitch of the male screw. According to this, it is possible to prevent the center of the screw shaft from being eccentric with respect to the center of the screw hole due to the alignment action caused by the R screw portion being fitted to the female screw. Further, when only one R-thread portion is provided, the required preveling torque is obtained by the only R-thread portion by making the only R-thread portion spirally continuous over at least one pitch of the male screw. Can be caused.
  • each of the compression side flank surface and the play side flank surface of the R screw portion may have the convex flank surface portion. That is, both the compression side flank surface and the play side flank surface of the R screw portion are in contact with each other so that there is no play with respect to the female screw (that is, the R screw portion of the male screw and the compression side flank surface of the female screw are in contact with each other, and It may have a convex flank surface portion having a convex arc shape in a cross section along the axial direction (so that the R thread portion of the male screw and the play side flank surface of the female screw come into contact with each other). According to this, the contact between the compression side flank surfaces of the R thread portion and the female screw and the contact between the play side flank surfaces of the R thread portion and the female screw can be more reliably generated.
  • the male screw may further include a proximal end side thread portion located on the proximal end side in the axial direction with respect to the R threaded portion.
  • This base end side threaded portion does not have the convex flank surface portion.
  • the base end side screw portion of the male screw and the compression side flank surface of the female screw come into contact with each other in a state where the screw shaft has been fastened to the screw hole, but the base end side screw portion of the male screw and the play side flank surface of the female screw A gap is formed between them.
  • the base end side threaded portion may be designed according to a general standard, for example, a reference thread shape specified in JIS B0205-1.
  • the compression side flank surface and the play side flank surface of the base end side threaded portion may be flat in a cross section along the axial direction of the bolt, or may be concave.
  • the base end side threaded portion, the R threaded portion and the tip end side threaded portion may be continuous in a spiral shape so as to form one thread.
  • the base end side threaded portion may be part of another thread that is axially separated from the R threaded portion.
  • the base end side threaded portion may be a part of another thread that is axially separated from the R threaded portion.
  • the male screw may further include a second R screw portion different from the R screw portion (hereinafter referred to as "first R screw portion") and an intermediate screw portion.
  • the second R threaded portion and the intermediate threaded portion may be located between the first R threaded portion and the base end side threaded portion in the axial direction.
  • the intermediate threaded portion may be located between the first R threaded portion and the second R threaded portion in the axial direction.
  • At least one of the compression side flank surface and the play side flank surface of the second R screw portion may have a convex arc-shaped convex flank surface portion in a cross section along the axial direction so as to eliminate play with respect to the female screw.
  • the convex flank surface portion of the second R thread portion may be spirally continuous over at least 1/2 pitch of the male thread.
  • the intermediate threaded portion does not have the convex flank surface portion.
  • the convex flank surface portion of the second R thread portion can be designed so as to slightly protrude outward in the radial direction from the dimensional tolerance of the reference mountain shape of the male thread.
  • the intermediate threaded portion may be spirally continuous over at least 0.9 pitch of the male thread. If the intermediate threaded portion is spirally continuous over at least one pitch of the male screw, the tip end side end portion of the first R screw and the base end side end portion of the second R screw are not adjacent to each other, and any cross section thereof. Also, an intermediate threaded portion is interposed between the first R threaded portion and the second R threaded portion.
  • each of the compression side flank surface and the play side flank surface of the second R screw portion may have the convex flank surface portion.
  • the convex flank surface portion of the second R screw portion may be spirally continuous over at least 3/4 pitch of the male screw, or may be spirally continuous over at least one pitch of the male screw.
  • the base end side threaded portion, the first R threaded portion, the intermediate threaded portion, the second R threaded portion and the tip end side threaded portion are spirally continuous so as to form one thread. good.
  • FIG. 1 is a front view of a locking bolt according to a first embodiment of the present invention, and an enlarged view of a main part.
  • FIG. 2 is a cross-sectional view of the state in which the locking bolt is fastened to the screw hole.
  • FIG. 3 is a front view and an enlarged view of a main part of the locking bolt according to the second embodiment of the present invention.
  • FIG. 4 is a schematic configuration diagram of a bolt rolling apparatus.
  • FIG. 5 is an enlarged side view of a main part of a rolled round die for rolling a locking bolt according to a second embodiment.
  • FIG. 6 is a graph showing the test results of the repeated attachment / detachment test of the locking bolt according to the second embodiment.
  • FIG 1 and 2 show a locking bolt according to the first embodiment of the present invention.
  • This locking bolt is used to fasten and fix the mounting component 4 to the mounted object 3 such as the device frame or the steel plate.
  • a screw hole 31 is formed in advance in the object to be attached 3 by tapping or the like, and a bolt insertion hole is formed in the attachment component 4.
  • the locking bolt is made of metal such as SS or SUS, and has a screw shaft 1 having a male screw 2 formed on the outer peripheral surface so as to be screwed into a screw hole 31 having a female screw.
  • the male screw 2 has an R screw portion 21 located in the middle of the axial direction of the screw shaft 1, a tip side screw portion 22 extending from the axial tip portion of the R screw portion 21 toward the tip side, and a shaft of the R screw portion 21. It is provided with a base end side screw portion 23 extending from the base end portion in the direction toward the base end side.
  • the tip side thread portion 22 and the proximal end side thread portion 23 are composed of threads having a general thread shape, for example, a triangular thread shape, and their compression side flank surface (upper side surface of the thread thread in the figure) and play side flank. All of the surfaces (lower side surfaces of the threads in the figure) are formed flat in a cross section along the axial direction.
  • the flank angle of each flank surface is, for example, 30 °.
  • each of the compression side flank surface and the play side flank surface of the R screw portion 21 is formed as a convex arc-shaped convex flank surface in a cross section along the axial direction so that there is no play with respect to the female screw of the screw hole 31. ing.
  • the compression side flank surface and the play side flank surface of the R thread portion 21 formed of the convex flank surface are spirally continuous over about two pitches of the male screw.
  • FIG. 3 shows a locking bolt according to a second embodiment of the present invention, and the same components as those of the first embodiment are designated by the same reference numerals, detailed description thereof will be omitted, and different configurations and operational effects will be described. do.
  • the locking bolts according to the second embodiment are two R-threaded portions 21', 21 "(shown by shaded portions in FIG. 3) separated in the axial direction and two R-threaded portions 21', 21". It is provided with an intermediate screw portion 24 provided between them.
  • Each R-threaded portion 21', 21 " is spirally continuous over about one pitch of the male screw.
  • the shape of each R-threaded portion may be the same as that of the first embodiment.
  • the intermediate threaded portion 24 is spirally continuous over about one pitch of the male thread.
  • the thread shape of the intermediate threaded portion 24 may be the same as that of the tip end side threaded portion 22 and the proximal end side threaded portion 23. That is, when the screw shaft 1 of the bolt is fastened to the screw hole 31, the compression side flank surface of the intermediate screw portion 24 comes into contact with the compression side flank surface of the female screw, but there is play between the play side flank surface of the intermediate screw portion 24 and the female screw.
  • Each flank surface of the intermediate threaded portion 24 is formed flat in a cross section along the axial direction so that a gap is formed between the flank surface and the side flank surface.
  • the loosening prevention bolt it is possible to prevent the bolt from loosening by generating a preveling torque by the two R screw portions. Moreover, by providing the intermediate threaded portion between the two R threaded portions, it is possible to prevent the preveling torque from becoming excessively large due to a manufacturing error or the like.
  • the locking bolt according to each of the above embodiments can be manufactured by using the bolt rolling apparatus shown in FIG.
  • This bolt rolling apparatus includes two rolled round dies, and by rolling a blank (bar) between the rolled round dies, a male screw is formed on the outer circumference of the blank.
  • FIG. 5 shows an example of a rolled round die for rolling a locking bolt according to a second embodiment.
  • This die has a diameter n times (for example, 8 times) the diameter of the screw shaft 1, and a multi-thread screw having n threads is formed on the outer peripheral surface.
  • n times for example, 8 times
  • the screw shaft rotates n times. That is, when the die rotates 1 / n, the screw shaft rotates once, and the screw shape on the outer circumference of the die is transferred to the screw shaft.
  • a part of the multi-threaded screw of the die is provided with a plurality of R flank surface forming portions (shown by a knitted portion in FIG. 5) for forming each flank surface of the two R screws. Since the number of male threads of the die is n, when forming the R threaded portion for about one pitch, each R flank surface forming portion may be continuous over about 1 / n circumference of the die.
  • FIG. 6 shows the result of measuring the residual preveling torque by the repeated attachment / detachment test of the locking bolt according to the second embodiment.
  • the size of the bolt used in the test is M20 and the screw pitch is 2.5 mm. From the test results, the preveling torque decreased to about 60% after the first 10 attachments and detachments, but the preveling torque was maintained at about 60% even after repeated attachments and detachments. As a result, it was confirmed that the anti-loosening bolt of the present embodiment exerts a sufficient anti-loosening function even if it is repeatedly attached and detached.
  • the present invention is not limited to the above embodiment, and the design can be changed as appropriate.
  • the axial force acting on the screw shaft of the bolt is relatively small, it is not necessary to provide the base end side screw portion.
  • Thread shaft 2 Male thread 21 R threaded part 22 Tip side threaded part 23 Base end side threaded part 24 Intermediate threaded part 31 Threaded hole

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bolts, Nuts, And Washers (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)

Abstract

La présente invention vise à proposer un boulon anti-desserrage ayant une excellente aptitude au travail de fixation. À cet effet, la présente invention concerne un boulon anti-desserrage qui a un arbre de vis 1 ayant une surface circonférentielle externe sur laquelle un filetage de vis mâle 2 est formé de façon à se visser avec un trou taraudé ayant un filetage de vis femelle. Le filetage de vis mâle 2 a une partie de filetage de vis R 21 qui est positionnée au niveau de la partie centrale dans la direction axiale de l'arbre de vis 1, une partie de filetage de vis côté extrémité de pointe 22 qui est positionnée plus près du côté extrémité de pointe dans la direction axiale que la partie de filetage de vis R 21, et une partie de filetage de vis côté extrémité de base 23 qui est positionnée plus près du côté extrémité de base dans la direction axiale que la partie de filetage de vis R 21. Au moins l'une de la surface de flanc côté compression et de la surface de flanc côté jeu de la partie de filetage de vis R 21 a une partie de surface de flanc convexe ayant une forme d'arc convexe dans la section transversale le long de la direction axiale, de façon à éliminer le jeu par rapport au filetage de vis femelle. La partie de surface de flanc convexe est formée en une spirale continue au moins sur un pas du filetage de vis mâle. Ni la partie de filetage de vis côté extrémité de pointe 22 ni la partie de filetage de vis côté extrémité de base 23 a la partie de surface de flanc convexe.
PCT/JP2021/024863 2020-12-28 2021-06-30 Boulon anti-desserrage WO2022145078A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2022572899A JP7424687B2 (ja) 2020-12-28 2021-06-30 緩み止めボルト

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JP2020219357 2020-12-28
JP2020-219357 2020-12-28

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WO2022145078A1 true WO2022145078A1 (fr) 2022-07-07

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001512807A (ja) * 1997-08-04 2001-08-28 エム．ヤニツキ ベルンハルト 低公差ねじ筋付きファスナー
JP2008151346A (ja) * 1996-09-11 2008-07-03 Interfast ねじ部品システム
JP2012013133A (ja) * 2010-06-30 2012-01-19 Nitto Seiko Co Ltd 緩み止めねじ
JP2013543962A (ja) * 2010-11-26 2013-12-09 ルイヤ グローバル ファスナーズ アーゲー 戻り止めねじ
JP2014206234A (ja) * 2013-04-13 2014-10-30 辻坂 宏 締結部材
JP2015137700A (ja) * 2014-01-22 2015-07-30 トヨタ自動車株式会社 アース用ボルト
JP2018100765A (ja) * 2016-12-22 2018-06-28 河村　正達 緩み止めナット
JP2019113156A (ja) * 2017-12-26 2019-07-11 日東精工株式会社 緩み止めねじ

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008151346A (ja) * 1996-09-11 2008-07-03 Interfast ねじ部品システム
JP2001512807A (ja) * 1997-08-04 2001-08-28 エム．ヤニツキ ベルンハルト 低公差ねじ筋付きファスナー
JP2012013133A (ja) * 2010-06-30 2012-01-19 Nitto Seiko Co Ltd 緩み止めねじ
JP2013543962A (ja) * 2010-11-26 2013-12-09 ルイヤ グローバル ファスナーズ アーゲー 戻り止めねじ
JP2014206234A (ja) * 2013-04-13 2014-10-30 辻坂 宏 締結部材
JP2015137700A (ja) * 2014-01-22 2015-07-30 トヨタ自動車株式会社 アース用ボルト
JP2018100765A (ja) * 2016-12-22 2018-06-28 河村　正達 緩み止めナット
JP2019113156A (ja) * 2017-12-26 2019-07-11 日東精工株式会社 緩み止めねじ

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JP7424687B2 (ja) 2024-01-30
JPWO2022145078A1 (fr) 2022-07-07

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