JP2008208983A

JP2008208983A - Slack preventing structure for screw with nut having inclined screw bottom portion

Info

Publication number: JP2008208983A
Application number: JP2007077810A
Authority: JP
Inventors: Yoshiro Haji; 嘉郎土師
Original assignee: WORLD LOCK KK
Current assignee: WORLD LOCK KK
Priority date: 2007-02-23
Filing date: 2007-02-23
Publication date: 2008-09-11

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nut which can be manually inserted without fixing a bolt, to which fastening force can be applied with one spanner, for which slack preventing work can be done in the same manufacturing processes as those of a standard nut. <P>SOLUTION: In this slack preventing structure, an inclination 2 of 27-37° is provided for a screw bottom portion of the nut. So, the inclination of the screw bottom portion of the nut is fastened to the front end of a bolt thread in a wedge form to produce screw slack preventing effects. During screw fastening, a load is supported by a thread face and the front end of a male thread to produce load dispersing effects. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

発明の詳細な説明Detailed Description of the Invention

本発明は、ナットのねじ谷底部に２７度から３７度の傾斜を設け、ねじ締め付け時において、ボルトのねじ山先端部に対してくさびを打ちこむ様に締結するねじの弛み防止構造。The present invention provides a screw loosening prevention structure in which an inclination of 27 ° to 37 ° is provided at the bottom of a thread root of a nut and fastened so as to strike a wedge against a screw thread tip at the time of screw tightening.

２００１年制定のＪＩＳＢ１１９９−１，２，３，４があるがネジ弛みの最大原因はねじ面のすべりボルト軸のねじれでありねじ脱落防止には効果があるが、弛み止めではないThere is JIS B1199-1, 2, 3, 4 established in 2001, but the biggest cause of screw loosening is torsion of the sliding bolt shaft on the screw surface, which is effective in preventing screw dropout, but not loosening prevention

特開２００５−１２１１５４は二次加工が必要で製造原価が高く、量産にはむかないJapanese Patent Laid-Open No. 2005-121154 requires secondary processing, has a high manufacturing cost, and is not suitable for mass production

特願２００５−７６９６９はねじ面の摩擦抵抗で弛みを防止する商品であるがねじ面のすべりが発生して弛み止め効果は期待できないJapanese Patent Application No. 2005-76969 is a product that prevents looseness by the frictional resistance of the screw surface, but it cannot be expected to prevent looseness due to slippage of the screw surface.

発明が解決しようとする課題Problems to be solved by the invention

従来品はナイロン樹脂で摩擦トルクを発生させたり、ねじ面を変形して摩擦トルクを発生させていたが、ボルトへのセットのときボルト側とナット側の両方を固定しないと締付け作業が出来ない不便があった。本発明は標準品のねじと同じように片手で作業できるConventional products generate friction torque with nylon resin, or generate friction torque by deforming the thread surface. However, when setting to the bolt, tightening work cannot be done unless both the bolt side and nut side are fixed. There was inconvenience. The present invention can be operated with one hand just like standard screws

ねじ弛みの最大原因はねじ面のすべりでありＪＩＳ規格、ＩＳＯ規格の弛み止めナットでは摩擦トルクを高くしてもボルト、ナットのねじ面のすべりを防止できない
本発明はボルト先端部にくさびを打ち込むような傾斜部を設けねじ面のすべりを防止したThe biggest cause of screw looseness is slippage of the screw surface. With the JIS standard and ISO standard loosening prevention nuts, even if the friction torque is increased, slipping of the screw surface of the bolt and nut cannot be prevented. Inclined part like this prevents slippage of the screw surface

ねじ力学からねじ締結時において座面側第一ねじ山に約６０％の荷重がかかり、第二ねじ山約１９％となり、座面側ボルトの第一ねじ山の破断、強度疲労が発生する
本発明は荷重を各ねじ山に分担して受けねじ山破断、強度疲労を防止する構造であるFrom screw mechanics, when the screw is tightened, a load of about 60% is applied to the first thread on the bearing surface side, and the second thread thread is about 19%. The invention is a structure that prevents load thread breakage and strength fatigue by sharing the load to each thread thread.

従来はナットねじ部に弛み防止加工をしてある為ナット挿入時はボルト、ナット双方をスパナで固定しないとナットの挿入および締付け出来なかった。本発明はＪＩＳ規格六角ナットと同じ使用方法で簡単にナットの締付けが可能Previously, the nut screw part was processed to prevent loosening, so when inserting the nut, it was not possible to insert and tighten the nut unless both the bolt and nut were fixed with a spanner. The present invention enables easy nut tightening with the same usage method as JIS standard hexagon nuts.

課題を解決するための手段Means for solving the problem

図１に示すようにナットねじ山谷底部に傾斜を設け、ボルトとの勘合時傾斜部がくさびの役目をしてねじ面のすべりを防止する。As shown in FIG. 1, an inclination is provided at the bottom of the screw thread valley, and the inclined portion serves as a wedge when fitted with a bolt to prevent the thread surface from slipping.

くさびの効果はＦ＝ｐｘｔａｎθより、締付けた力の約２．２倍になり弛み止め効果を発揮するThe effect of the wedge is approximately 2.2 times the tightening force from F = pxtanθ, and exhibits a loosening prevention effect.

ナットのネジ山は角度、ピッチ等はＪＩＳ規格品と同じであり簡単に手でナットを回せるNut threads are the same as JIS standard products in angle, pitch, etc., and you can easily turn the nut by hand.

ねじを締付けた時の荷重をねじ面と、ボルト先端部で受けるため均一な荷重がねじにかかる。Because the load when the screw is tightened is received by the screw surface and the bolt tip, a uniform load is applied to the screw.

本発明の実施の形態を図面を参照して説明する。
図１において、ボルト１はめねじ、ナット２に対してねじ山間隙間があり手で簡単に挿入できるEmbodiments of the present invention will be described with reference to the drawings.
In FIG. 1, there is a thread gap between the bolt 1 female screw and the nut 2 and it can be easily inserted by hand.

図２において、ねじ締付け時はボルト先端部４がナット谷底傾斜部にあたり、ねじ面のすべりを防止し、弛み止め効果を発揮し、荷重をねじ面、ボルト先端部５で分散して受けるIn FIG. 2, when the screw is tightened, the bolt tip 4 hits the slope of the bottom of the nut and prevents the screw surface from slipping and exhibits a loosening prevention effect. The load is distributed and received by the screw surface and the bolt tip 5.

図３において、めねじ、ナット谷底傾斜部はねじ基準７より０．０５ｍｍ〜０．１２ｍｍ下がった８位置より２７度から３７度傾斜しているIn FIG. 3, the female thread and nut valley bottom inclined part is inclined from 27 degrees to 37 degrees from the 8 position which is 0.05 mm to 0.12 mm lower than the screw reference 7.

発明の効果The invention's effect

ＮＡＳ規格振動試験において３０，０００回転後も正常に締結しており、弛み止め効果を確認したIn the NAS standard vibration test, it was fastened even after 30,000 rotations, and the anti-loosening effect was confirmed.

引張り荷重試験においてＪＩＳ数値の３５％高い荷重でもボルトの破断がなく、本発明品が荷重分散していることを確認したIn the tensile load test, it was confirmed that the bolt was not broken even at a load 35% higher than the JIS value, and the product of the present invention was dispersed.

ねじ締付け前のボルト、ナットのねじ山であるIt is the bolt and nut thread before screw tightening. ねじ締付け後のボルト、ナットのねじ山であるBolts and screw threads after tightening 傾斜部を設けたねじ山Thread with slope

符号の説明Explanation of symbols

１ボルト
２傾斜部を設けためねじ、ナットねじ山
３締付け前のねじ山
４締付け後のオネジ、ボルトねじ山
５締付け後のねじ山
６ナットのねじ山成形用タップねじ山
７ねじ形状基準線
８めねじ、ナットの谷底傾斜部DESCRIPTION OF SYMBOLS 1 Bolt 2 Screw for providing an inclined part, Nut thread 3 Screw thread 4 before tightening 4 Male screw after tightening, Bolt thread 5 Screw thread 6 after tightening Tap thread 7 for screw thread forming of nut 7 Screw shape reference line 8 Female thread, nut bottom sloped part

Claims

ナットのねじ谷底部に２７度から３７度の傾斜を設けたねじ山Thread with an inclination of 27 to 37 degrees at the bottom of the thread root of the nut

ナットのねじ谷底部の２７度から３７度の傾斜がボルトねじ山を締め付ける構造である。The inclination of the bottom of the thread root of the nut is 27 ° to 37 ° to tighten the bolt thread.

ナットのねじ谷底部の傾斜がボルトねじ山先端部に対してくさび形に締め付けねじの弛み止め効果を発揮するThe inclination of the bottom of the thread root of the nut has a wedge shape with respect to the tip of the bolt thread, and demonstrates the effect of preventing the loosening of the tightening screw.

ねじ締め付け時において、荷重をねじ面と、おねじ山先端部で受け荷重分散効果を発揮するねじ山。A thread that exerts a load dispersion effect when receiving a load on the thread surface and the male thread tip during screw tightening.