WO2013157338A1 - Double écrou - Google Patents

Double écrou Download PDF

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Publication number
WO2013157338A1
WO2013157338A1 PCT/JP2013/057631 JP2013057631W WO2013157338A1 WO 2013157338 A1 WO2013157338 A1 WO 2013157338A1 JP 2013057631 W JP2013057631 W JP 2013057631W WO 2013157338 A1 WO2013157338 A1 WO 2013157338A1
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WO
WIPO (PCT)
Prior art keywords
nut
double
double nut
bolt
convex portion
Prior art date
Application number
PCT/JP2013/057631
Other languages
English (en)
Japanese (ja)
Inventor
伊藤　勝夫
Original Assignee
イイファス株式会社
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 イイファス株式会社 filed Critical イイファス株式会社
Publication of WO2013157338A1 publication Critical patent/WO2013157338A1/fr

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    • 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
    • F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
    • F16B39/12—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts
    • F16B39/122—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts foreseen with mating surfaces inclined, i.e. not normal, to the bolt axis
    • 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
    • F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
    • F16B39/12—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts
    • F16B39/126—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts causing radial forces on the bolt-shaft

Definitions

  • the present invention relates to a double nut used for loosening when a nut is fastened to a bolt.
  • ⁇ Double nuts have a function to prevent loosening of nuts by friction force generated when another nut is fastened on top of a nut fastened to a bolt, and both nuts are pressed.
  • a convex portion protruding from an end portion is provided on one nut, and a concave portion into which the convex portion can be fitted is provided on the other nut, and the convex portion or the concave portion is provided.
  • One of these is eccentric.
  • Japanese Utility Model Laid-Open No. 48-29257 includes a tightening nut having a concave portion of an appropriate depth on the upper surface portion and a loosening nut having a convex portion that fits into the concave portion.
  • a lock nut whose center is slightly eccentric with respect to the axis of the bolt.
  • a shearing force is generated in the locking nut fastened to the bolt in a direction perpendicular to the axial center line of the bolt, and the tightening nut has a direction opposite to the locking nut. It is said that the loosening action can be enhanced by the friction force generated by the contact between the nut and the bolt.
  • Japanese Patent Laid-Open No. 6-337012 discloses an eccentric double nut in which a tapered convex portion is formed at the upper portion of the lower nut and a tapered concave portion is formed at the lower portion of the upper nut.
  • An eccentric double nut has been proposed in which a flange having a diameter larger than the nut diameter is provided at the lower part of the periphery (Patent Document 2).
  • Patent Document 2 as in the invention described in Patent Document 1, the lower nut functions as a fastening nut and the upper nut functions as a loosening nut. Further, when the upper nut is fastened, the fastener comes into contact with a flange provided at the lower periphery of the upper nut, so that the fastener does not interfere with the lower nut.
  • This invention was made in order to solve such a problem, Comprising: It aims at providing the double nut which can suppress manufacturing cost by reducing a manufacturing process while being able to manufacture simply. Yes.
  • a double nut according to the present invention includes a first nut having a frustoconical convex portion concentric with a female screw hole screwed into a bolt and having a diameter reduced from one end surface of the nut toward the outside, and the bolt
  • a second nut having a frustoconical concave recess that is concentric with a female screw hole to be screwed into the nut and capable of fitting the convex portion into one end surface of the nut. Is formed with an eccentric protrusion formed by projecting a part of the inner peripheral surface of the concave portion inward so that the outer peripheral surface of the convex portion can be pressed when the convex portion is fitted into the concave portion. ing.
  • the eccentric protrusion has a different protruding height along the circumferential direction, and presses the convex portion when the double nut is screwed to the bolt.
  • the protruding height on the front side to be formed may be lower than that on the rear side.
  • the eccentric protrusion is formed to protrude in the concave portion by pressing a part of the outer surface of the second nut inward and plastically deforming, and by the pressing.
  • a guide protrusion may be formed by projecting a part of the outer surface of the second nut outward by plastic deformation.
  • the manufacturing process can be simplified, the manufacturing process can be reduced, the manufacturing cost can be suppressed, and the efficiency of the fastening work can be improved.
  • FIG. 4 is a vertical sectional view taken along line 4A-4A showing a second nut in the present embodiment. It is a side view which shows the 2nd nut in this embodiment.
  • FIG. 6 is a cross-sectional view taken along line 6A-6A showing the second nut in the present embodiment. It is a perspective view which shows one Embodiment of the double nut fastener which concerns on this invention. It is a bottom view which shows the double nut fastener in this embodiment.
  • FIG. 1 A longitudinal sectional view showing a state in which the second nut is temporarily fixed in the double nut fastening method of the present embodiment, and (b) a longitudinal section showing a state after the second nut fastening operation in the same method.
  • FIG. It is a perspective view which shows the 1st nut in other embodiment.
  • FIG. 1 is a perspective view showing a first nut 2 of the double nut 1 of the present embodiment
  • FIG. 2 is a perspective view showing a second nut 3.
  • the double nut 1 of the present embodiment includes a first nut 2 and a second nut 3 as shown in FIGS.
  • the first nut 2 is a hexagonal nut, and has a female screw hole 21 to be screwed with the bolt B, and a convex portion 22 to be inserted into a concave portion 32 of the second nut 3 to be described later.
  • the convex portion 22 is concentric with the female screw hole 21 and is formed in a truncated conical convex shape whose diameter is reduced outward from one end surface of the nut.
  • the 1st nut 2 in this embodiment functions as a fastening nut fastened with the said volt
  • the second nut 3 is a hexagonal nut of the same type as the first nut 2, and includes a female screw hole 31 to be screwed with the bolt B, and a convex portion 22 of the first nut 2. And a recess 32 to be inserted.
  • the concave portion 32 is concentric with the female screw hole 31 and is formed in a truncated conical concave shape into which the convex portion 22 can be fitted into one end face of the nut.
  • an eccentric protrusion 33 is formed on the inner peripheral surface of the recess 32. As shown in FIGS. 3, 4 and 6, the eccentric protrusion 33 is formed by projecting a part of the inner peripheral surface of the recess 32 inward. That is, by providing the eccentric protrusion 33, the midpoint between the eccentric protrusion 33 and the inner peripheral surface of the concave portion 32 that is axially symmetric with the eccentric protrusion 33 is eccentric with respect to the axis of the female screw hole 31. It is supposed to be.
  • the eccentric protrusion 33 in the present embodiment is formed so as to have different protrusion heights along the circumferential direction, and presses the convex portion 22 when the double nut 1 is screwed to the bolt B.
  • the protrusion height of the front side F is formed lower than the rear side R. That is, as shown in FIG. 3, the eccentric protrusion 33 in the present embodiment is formed such that the portion that comes into contact later in the tightening direction is gradually higher than the portion that comes into contact earlier, and is light at the start of tightening. It is tightened by force, and gradually requires a large force as the tightening operation proceeds, and in accordance with this, the pressing force increases and the loosening prevention effect is enhanced.
  • the eccentric protrusion 33 can be formed by an appropriately selected processing method such as die molding or pressing.
  • the outer peripheral surface of the recess 32 is pressed to protrude inward and is formed by plastic deformation.
  • the second nut 3 is orthogonal to the axis of the bolt B by the eccentric protrusion 33 pressing the outer peripheral surface of the convex portion 22 when the convex portion 22 is fitted into the concave portion 32.
  • a shearing force is applied in the direction to perform, and functions as a locking nut that exhibits a locking action.
  • a guide projection 34 is formed on the outer peripheral surface of the second nut 3 in the present embodiment.
  • the guide protrusion 34 is used to lock a lower end surface of the double nut fastener 4 described later so that the nut accommodating portion 41 of the double nut fastener 4 does not fit into the first nut 2. 2, 3, 5, and 6, a part of the outer peripheral surface protrudes outward, and the double nut fastener 4 is formed at a height that can be locked. Yes.
  • the guide protrusion 34 is formed by pressing a part of the outer peripheral surface of the recess 32 at the same time as forming the eccentric protrusion 33 in order to simplify the machining process, and plastic deformation due to the pressing. .
  • the first nut 2 and the second nut 3 are not limited to hexagonal nuts, and may be polygonal nuts such as square nuts and octagonal nuts, circular nuts, or non-circular nuts, and are loosely secured.
  • the nut provided on the upper side as a nut may be a cap nut, a wing nut, an eye nut, a part having an internal thread, or the like.
  • the double nut fastener 4 used for fastening the double nut 1 of this embodiment is a fastener including a socket such as a box wrench or a socket wrench, and mainly includes a nut housing portion 41 into which the double nut 1 is fitted. And a guide groove 42 for fitting the guide protrusion 34 of the second nut 3 and guiding it to the back side.
  • the double nut fastener 4 is not limited to a socket for a socket wrench, and may have an equivalent configuration at the tip of a spectacle wrench, a screwdriver, or the like.
  • the nut accommodating portion 41 is formed in a hexagonal concave shape of the same type as the double nut 1, and is a double nut in which the first nut 2 and the second nut 3 are stacked. It has a shape and depth that can be inserted.
  • the guide groove 42 is a groove for fitting the guide projection 34 and guiding it to the back side when the second nut 3 is fitted into the nut accommodating portion 41.
  • a linear groove is formed in the vertical direction.
  • the fastener used for fastening of the double nut 1 of this embodiment is not limited to the said double nut fastener 4, It may be a spanner, a torque wrench, etc. which are generally marketed. Good.
  • the method of fastening the double nut 1 in the present embodiment includes a double nut fitting step for setting the double nut 1 to the double nut fastener 4 and a double nut temporary fastening for temporarily fastening the double nut 1.
  • the double nut insertion step is a step of inserting the first nut 2 together with the second nut 3 into the nut accommodating portion 41 of the double nut fastener 4.
  • the guide protrusions 34 of the second nut 3 are fitted and aligned in the guide grooves 42 of the double nut fastener 4, and the guide protrusions 34 are aligned.
  • the second nut 3 and the first nut 2 are inserted into the nut accommodating portion 41 by moving to the back side along the guide groove 42.
  • the convex portion 22 of the first nut 2 is lightly in contact with an eccentric protrusion 33 provided in the concave portion 32 of the second nut 3, and is loosely or slightly fitted in the concave portion 32. However, it is not completely inserted.
  • the second nut 3 and the first nut 2 may be separately fitted into the nut accommodating portion 41, or the convex portion 22 of the first nut 2 and the concave portion 32 of the second nut 3 are previously overlapped together. It may be inserted in.
  • the double nut temporary fixing step as shown in FIG. 9 (b), the double nut 1 is rotated by the double nut fastener 4 and screwed into the bolt B to be fastened to the fastening object. And the second nut 3 is temporarily fixed.
  • the first nut 2 is screwed into the bolt B and is completely fastened to the fastening object.
  • the second nut 3 is screwed to the bolt B together with the first nut 2, and is fastened to the bolt B halfway along with the fastening of the first nut 2. That is, as shown in FIG. 10A, the convex portion 22 of the first nut 2 only abuts on the eccentric protrusion 33 provided in the concave portion 32 of the second nut 3, and is Thus, no shear force is generated in the orthogonal direction, and the double nut 1 is temporarily fixed.
  • the second nut 3 can be temporarily fixed simultaneously with the operation of completely fastening the first nut 2.
  • the insertion position replacement step is a step in which the double nut fastener 4 is once removed from the double nut 1 and the position of the double nut fastener 4 is shifted and reinserted. Specifically, as shown in FIG. 9C, the double nut fastener 4 is temporarily removed from the double nut 1 temporarily fixed by the double nut temporary fixing step. Next, as shown in FIG. 9D, the removed double nut fastener 4 is shifted so that the guide groove 42 does not fit the guide projection 34 of the second nut 3, and the double nut fastener 4 is doubled again. By inserting the nut 1, the insertion position is changed.
  • the fastening completion process is a process of completing the fastening of the double nut 1 by fastening the second nut 3 to prevent the first nut 2 from loosening.
  • the lower end surface of the replaced double nut fastener 4 comes into contact with the guide projection 34 and cannot be inserted deeper than that. Therefore, the double nut fastener 4 is in a state where only the second nut 3 is fitted, and does not interfere with the first nut 2. In this state, by rotating the double nut fastener 4, only the second nut 3 is rotated and fastened to the bolt B.
  • the second nut 3 in the fastening completion process is rotated along the bolt B by a rotation operation, so that the eccentric protrusion 33 provided in the concave portion 32 rotates while pressing the convex portion 22 of the first nut 2.
  • the convex portion 22 is formed in a truncated cone shape, and the pressure received from the eccentric protrusion 33 increases as the screw advances.
  • the pressing position changes from the lower protrusion on the front side F to the higher protrusion on the rear side R.
  • the tightening torque is light at first and gradually increases toward the second half of the tightening, so that the pressing force and the pressing area can be gradually increased.
  • the tightening operation becomes smooth as a whole, and the degree of the tightening effect can be felt by the degree of torque transmitted to the double nut fastener 4. Therefore, the operator does not end the tightening operation at a halfway position, and the result is that the tightening is performed firmly to the end, and a high locking effect is surely obtained.
  • the second nut 3 generates a shearing force in a direction perpendicular to the axis of the bolt B, and the first nut 2 has a second force.
  • a shearing force in the opposite direction to the nut 3 is generated.
  • the female screw hole 21 of the first nut 2 and the female screw hole 31 of the second nut 3 are pressed against the bolt B, and the loosening action is enhanced by the frictional force generated there.
  • the double nut 1 of the present embodiment as described above, the following effects can be obtained.
  • the eccentric protrusion 33 it is possible to exert a locking effect due to the eccentric action during fastening.
  • the eccentric protrusion 33 and the guide protrusion 34 can be formed by a single pressing operation, and can be easily manufactured. 4).
  • the fastening operation of the nut for fastening and the temporary fastening operation of the nut for loosening can be performed at the same time. After that, the double nut fastener 4 can be easily replaced to complete the fastening. Will improve. 5. Since the height of the eccentric protrusion 33 is changed in the tightening direction, the tightening operation is easy and the degree of tightening can be felt by hand. A stopping effect is obtained.
  • the double nut according to the present invention is not limited to the above-described embodiment, and can be changed as appropriate.
  • first nut 2 and the second nut 3 may be turned upside down, the second nut 3 may be used as a fastening nut, and the first nut 2 having the convex portion 22 may be used as a loosening nut.
  • a plurality of grooves 23 may be provided on the side surface of the convex portion 22 of the first nut 2 as shown in FIG.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Connection Of Plates (AREA)

Abstract

Le problème décrit par la présente invention est de produire un double écrou qui peut être facilement fabriqué et dont le coût de fabrication peut être réduit au minimum grâce à la réduction du nombre d'étapes de fabrication. La solution selon l'invention porte sur un double écrou (1) configuré à partir : d'un premier écrou (2) possédant une saillie convexe (22) en forme de cône tronqué dont le diamètre diminue vers l'extérieur depuis une première face d'extrémité de l'écrou et est concentrique avec un trou de vis femelle (21) vissé sur un boulon (B) ; d'un second écrou (3) possédant, sur une première face d'extrémité de l'écrou, un creux concave (32) en forme de cône tronqué dans lequel la saillie (22) peut s'emboîter, et qui est concentrique avec un trou de vis femelle (31) vissé sur le boulon (B). Une saillie excentrique (33), dans laquelle une partie d'une face périphérique interne du creux (32) fait saillie vers l'intérieur de manière à pouvoir appuyer sur une face périphérique externe de la saillie (22) lorsque la saillie (22) est emboîtée dans le creux (32), est formée dans le second écrou (3).
PCT/JP2013/057631 2012-04-19 2013-03-18 Double écrou WO2013157338A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012-096081 2012-04-19
JP2012096081A JP5235237B1 (ja) 2012-04-19 2012-04-19 二重ナット

Publications (1)

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WO2013157338A1 true WO2013157338A1 (fr) 2013-10-24

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PCT/JP2013/057631 WO2013157338A1 (fr) 2012-04-19 2013-03-18 Double écrou

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JP (1) JP5235237B1 (fr)
WO (1) WO2013157338A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110397660A (zh) * 2019-08-29 2019-11-01 海盐盛信标准件有限公司 一种机械设备用分体式紧固螺母
CN111365350A (zh) * 2020-04-21 2020-07-03 黄从武 螺母组件和螺栓套件
JP7538545B2 (ja) 2022-01-14 2024-08-22 政晴 堀内 ナット構造体

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105003518A (zh) * 2015-07-15 2015-10-28 蒋昆明 一种轮毂螺栓组件
JP6417059B1 (ja) * 2017-05-29 2018-10-31 宝輝 山下 ナットおよび締結方法
CN108679073B (zh) * 2018-08-03 2023-11-14 周峰 防震螺母套件

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08141919A (ja) * 1994-11-11 1996-06-04 East Japan Railway Co ダブルナット用ソケット
JPH09144733A (ja) * 1995-11-24 1997-06-03 Nitto Seiko Co Ltd 緩み止めねじ
JP2007229903A (ja) * 2006-03-03 2007-09-13 Koyo Kizai Kk 緩み止めナット用ソケットレンチおよび緩み止めナット締結方法
JP2008014402A (ja) * 2006-07-05 2008-01-24 Hard Lock Industry Co Ltd ボルトの緩み止め防止装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08141919A (ja) * 1994-11-11 1996-06-04 East Japan Railway Co ダブルナット用ソケット
JPH09144733A (ja) * 1995-11-24 1997-06-03 Nitto Seiko Co Ltd 緩み止めねじ
JP2007229903A (ja) * 2006-03-03 2007-09-13 Koyo Kizai Kk 緩み止めナット用ソケットレンチおよび緩み止めナット締結方法
JP2008014402A (ja) * 2006-07-05 2008-01-24 Hard Lock Industry Co Ltd ボルトの緩み止め防止装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110397660A (zh) * 2019-08-29 2019-11-01 海盐盛信标准件有限公司 一种机械设备用分体式紧固螺母
CN110397660B (zh) * 2019-08-29 2024-04-09 海盐盛信标准件股份有限公司 一种机械设备用分体式紧固螺母
CN111365350A (zh) * 2020-04-21 2020-07-03 黄从武 螺母组件和螺栓套件
JP7538545B2 (ja) 2022-01-14 2024-08-22 政晴 堀内 ナット構造体

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JP2013224679A (ja) 2013-10-31
JP5235237B1 (ja) 2013-07-10

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