JP2016093877A

JP2016093877A - Manufacturing method of nut

Info

Publication number: JP2016093877A
Application number: JP2014232681A
Authority: JP
Inventors: 啓允鈴木; Hiromitsu Suzuki; 英義岸田; Hideyoshi Kishida; 敏治伊藤; Toshiharu Ito
Original assignee: Shiroki Corp
Current assignee: Shiroki Corp
Priority date: 2014-11-17
Filing date: 2014-11-17
Publication date: 2016-05-26
Anticipated expiration: 2034-11-17
Also published as: JP6548892B2

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a nut, capable of manufacturing the nut composed of two members having female screw holes different in specification from each other, while accurately communicating the female screw holes formed in the two members with each other.SOLUTION: A manufacturing method of a nut 13 comprises a first threadedly engaging part 14 having a first female screw hole 14b, and a second threadedly engaging part 16 having a second female screw hole 16d different in specification from the first female screw hole and coinciding in phase with the first female screw hole, and comprises an integral step of integrating the first threadedly engaging part and the second threadedly engaging part, and a female screw hole forming step of forming at least one of the first female screw hole and the second female screw hole by inserting/extracting a first tap screw 20 to/from the inside of the first and second integrated threadedly engaging parts.SELECTED DRAWING: Figure 7

Description

本発明はナットの製造方法に関する。 The present invention relates to a method for manufacturing a nut.

特許文献１のナットは二部材により構成してある。即ち、ナットを樹脂製の通常螺合部と金属製の非常時係合部とを互いに一体化することにより構成している。通常螺合部には、金属製のリードスクリューの雄ネジと同径でありかつ自身の山部（ネジ山）の幅（厚み）が雄ネジの谷部（溝部）のそれと同じである通常螺合雌ネジ孔が形成してある。非常時係合部には、リードスクリューの雄ネジ及び通常螺合雌ネジ孔より大径かつ自身の山部（ネジ山）の幅（厚み）が通常螺合雌ネジ孔のそれより小さい非常時係合雌ネジ孔が形成してある。そのため、通常使用時は通常螺合部の通常螺合雌ネジ孔（の山部）のみがリードスクリューの雄ネジ（の山部）と螺合し、非常時係合部の非常時係合雌ネジ孔（山部）はリードスクリューの雄ネジ溝（の山部）とは螺合しない。 The nut of Patent Document 1 is composed of two members. That is, the nut is formed by integrating the normal screwing portion made of resin and the emergency engagement portion made of metal with each other. The normal threaded portion has the same diameter as the male lead screw of the metal lead screw and the width (thickness) of the thread (thread) is the same as that of the male thread valley (groove). A female screw hole is formed. The emergency engagement part is an emergency that has a larger diameter than the male screw of the lead screw and the normal threaded female screw hole, and the width (thickness) of its thread (thread) smaller than that of the normal threaded female screw hole. An engaging female screw hole is formed. Therefore, during normal use, only the normal threaded female screw hole (the crest) of the normal threaded portion is screwed with the male screw (the crest) of the lead screw, and the emergency engaging female of the emergency engaging portion is engaged. The screw hole (mountain portion) is not screwed with the male screw groove (mountain portion) of the lead screw.

特開２０１４−１２５０４６号公報JP 2014-125046 A

特許文献１は、予め通常螺合雌ネジ孔を形成した通常螺合部と、予め非常時係合雌ネジ孔を形成した非常時係合部と、を互いにセレーション嵌合して一体化している。
しかし、通常螺合部と非常時係合部とからなるナットをこのような方法で製造する場合は、通常螺合部と非常時係合部のセレーション嵌合部を極めて精度よく製造しないと、セレーション嵌合した際に通常螺合部の通常螺合雌ネジ孔と非常時係合部の非常時係合雌ネジ孔どうしの接続部に段差が生じてしまう（両者の回転方向の位相がずれてしまう）。仮に段差が生じると、ナットとリードスクリューの相対移動が不円滑になったり、相対移動できなくなるおそれがある。
しかしながら、通常螺合部と非常時係合部のセレーション嵌合部を極めて精度よく製造するのは決して容易ではない。 In Patent Document 1, a normal threaded portion in which a normal threaded female screw hole is previously formed and an emergency engagement portion in which an emergency engagement female screw hole is previously formed are serrated and integrated with each other. .
However, when manufacturing a nut composed of a normal threaded portion and an emergency engagement portion by such a method, unless the serration fitting portion of the normal screwed portion and the emergency engagement portion is manufactured with extremely high accuracy, When the serration is engaged, a step is generated at the connection between the normal threaded female screw hole of the normal threaded part and the emergency engagement female screw hole of the emergency engagement part. ) If a level difference is generated, the relative movement between the nut and the lead screw may be unsmoothed or the relative movement may not be possible.
However, it is not easy to manufacture the serration fitting portion of the normal threaded portion and the emergency engagement portion with extremely high accuracy.

本発明は、二部材からなりかつ両者の雌ネジ孔の仕様が異なるナットを、当該二部材に形成した雌ネジ孔どうしを互いに精度よく連通させつつ製造することが可能なナットの製造方法を提供することを目的とする。 The present invention provides a nut manufacturing method capable of manufacturing a nut composed of two members and having different specifications of the female screw holes of the two members while accurately communicating the female screw holes formed in the two members with each other. The purpose is to do.

本発明のナットの製造方法は、第一雌ネジ孔を有する第一螺合部と、上記第一雌ネジ孔とは仕様が異なりかつ位相が一致する第二雌ネジ孔を有する第二螺合部と、を備えるナットの製造方法において、上記第一螺合部と上記第二螺合部を一体化する一体化ステップ、及び一体化した上記第一螺合部及び上記第二螺合部の内部に対して、第一タップネジを挿脱することにより上記第一雌ネジ孔と上記第二雌ネジ孔の少なくとも一方を形成する雌ネジ孔形成ステップ、を有することを特徴としている。 The nut manufacturing method of the present invention includes a first threaded portion having a first female threaded hole and a second threaded joint having a second female threaded hole having different specifications and in phase with the first female threaded hole. A step of integrating the first screwed portion and the second screwed portion, and the integrated first screwed portion and the second screwed portion. A female screw hole forming step for forming at least one of the first female screw hole and the second female screw hole by inserting and removing the first tap screw with respect to the inside is characterized.

上記第一雌ネジ孔と上記第二雌ネジ孔の谷部の径が互いに異なってもよい。 The diameters of the valleys of the first female screw hole and the second female screw hole may be different from each other.

記第一タップネジが、上記第一雌ネジ孔と対応する形状の第一ネジ孔形成部及び該第一タップネジの軸線方向位置が該第一ネジ孔形成部とは異なりかつ上記第二雌ネジ孔と対応する形状である第二ネジ孔形成部を備え、上記雌ネジ孔形成ステップが、互いに一体化した上記第一螺合部及び上記第二螺合部の内部に上記第一タップネジを挿脱することにより、上記第一ネジ孔形成部により上記第一螺合部に上記第一雌ネジ孔を形成しかつ上記第二ネジ孔形成部により上記第二螺合部に上記第二雌ネジ孔を形成するステップであってもよい。 The first tap screw is different from the first screw hole forming portion in the first screw hole forming portion having a shape corresponding to the first female screw hole and the axial direction position of the first tap screw and the second female screw hole. The female screw hole forming step includes inserting and removing the first tap screw into and from the first screwed part and the second screwed part integrated with each other. Thus, the first female screw hole is formed in the first screwed portion by the first screw hole forming portion, and the second female screw hole is formed in the second screwed portion by the second screw hole forming portion. It may be a step of forming.

小径ネジ孔形成部及び該第一タップネジの軸線方向位置が該小径ネジ孔形成部とは異なりかつ上記第二雌ネジ孔と対応する形状である第二ネジ孔形成部を有する上記第一タップネジと、上記小径ネジ孔形成部より大径かつ上記第一雌ネジ孔と対応する形状の第一ネジ孔形成部を有する、上記第一タップネジとは別の第二タップネジと、を備え、上記雌ネジ孔形成ステップが、互いに一体化した上記第一螺合部及び上記第二螺合部の内部に上記第一タップネジを挿脱することにより、上記小径ネジ孔形成部により上記第一螺合部に上記第一雌ネジ孔より小径の小径雌ネジ孔を形成しかつ上記第二ネジ孔形成部により上記第二螺合部に上記第二雌ネジ孔を形成する第一形成ステップと、上記第一螺合部に形成した上記小径雌ネジ孔に対して上記第二タップネジを挿入して上記第一ネジ孔形成部によって上記小径雌ネジ孔を拡径することにより、上記第一螺合部に上記第一雌ネジ孔を形成する第二形成ステップと、を備えてもよい。 The first tap screw having a second screw hole forming portion in which the axial position of the small diameter screw hole forming portion and the first tap screw is different from the small diameter screw hole forming portion and has a shape corresponding to the second female screw hole; A second tap screw different from the first tap screw, having a first screw hole forming portion having a shape larger than the small diameter screw hole forming portion and corresponding to the first female screw hole. In the hole forming step, the first tap screw is inserted into and removed from the first screwed portion and the second screwed portion which are integrated with each other, so that the small screw hole forming portion is connected to the first screwed portion. A first forming step of forming a small-diameter female screw hole having a smaller diameter than the first female screw hole and forming the second female screw hole in the second threaded portion by the second screw hole forming portion; With respect to the small-diameter female screw hole formed in the threaded portion, the first And a second forming step of forming the first female screw hole in the first threaded portion by inserting a tap screw and expanding the small-diameter female screw hole by the first screw hole forming portion. Also good.

上記第一雌ネジ孔と対応する形状の第一ネジ孔形成部を有する上記第一タップネジと、上記第二雌ネジ孔と対応する形状をなしかつ上記第一ネジ孔形成部とは仕様が異なる第二ネジ孔形成部を有する、上記第一タップネジとは別の第二タップネジと、を備え、上記雌ネジ孔形成ステップが、互いに一体化した上記第一螺合部及び上記第二螺合部の内部に上記第一タップネジを挿脱することにより、上記第一ネジ孔形成部により上記第一螺合部及び上記第二螺合部に上記第一雌ネジ孔を形成する第一形成ステップと、上記第二螺合部に形成した上記第一雌ネジ孔に対して上記第二タップネジを挿脱して上記第二ネジ孔形成部によって上記第二螺合部の上記第一雌ネジ孔の仕様を変更することにより、上記第二螺合部に上記第二雌ネジ孔を形成する第二形成ステップと、を備えてもよい。 The first tap screw having the first screw hole forming portion having a shape corresponding to the first female screw hole has a shape corresponding to the second female screw hole and has different specifications from the first screw hole forming portion. A second tapped screw having a second tapped hole forming portion and a second tapped screw different from the first tapped screw, wherein the first tapped portion and the second tapped portion are integrated with each other. A first forming step of forming the first female screw hole in the first screwed portion and the second screwed portion by the first screw hole forming portion by inserting and removing the first tap screw into the inside of the first tap screw; The specification of the first female screw hole of the second screwing portion by inserting and removing the second tap screw with respect to the first female screw hole formed in the second screwing portion and the second screw hole forming portion. To form the second female screw hole in the second screwing portion. A second forming step may be provided.

上記第二タップネジの先端部に、上記第一螺合部と上記第二螺合部の少なくとも一方に形成した雌ネジ孔に対して該雌ネジ孔を削ることなく係合する誘い込み雄ネジ部を設けてもよい。 A leading male screw portion that engages a female screw hole formed in at least one of the first screwing portion and the second screwing portion without cutting the female screw hole at a tip portion of the second tap screw. It may be provided.

上記第一タップネジと上記第二タップネジの少なくとも一方の上記第一螺合部及び上記第二螺合部に対する挿入位置を所定位置で規制する規制手段を備えてもよい。 You may provide the control means which controls the insertion position with respect to the said 1st screwing part and said 2nd screwing part of at least one of the said 1st tap screw and the said 2nd tap screw in a predetermined position.

第一螺合部と第二螺合部を一体化した上で、第一螺合部及び第二螺合部の内部に対して第一タップネジによって第一雌ネジ孔と第二雌ネジ孔の少なくとも一方を形成するので、第一螺合部と第二螺合部に形成した雌ネジ孔どうしを互いに精度よく連通させながら（両者の回転方向の位相を合わせながら）ナットを製造ネジするのが容易である。 After integrating the first screwed portion and the second screwed portion, the first female screw hole and the second female screw hole are formed by the first tap screw with respect to the inside of the first screwed portion and the second screwed portion. Since at least one of them is formed, the nut is manufactured and screwed while accurately communicating the female screw holes formed in the first screwing portion and the second screwing portion with each other (matching the phase in the rotational direction of both). Easy.

本発明の第一の実施形態の送りネジ機構の斜視図である。It is a perspective view of the feed screw mechanism of a first embodiment of the present invention. リードスクリューとナットのリードスクリューの中心軸線に沿う拡大断面図である。It is an expanded sectional view which follows the central axis of a lead screw and a lead screw of a nut. ネジ溝切削前の非常時係合部の単品斜視図である。It is a single-piece | unit perspective view of the emergency engaging part before a thread groove cutting. ネジ溝切削前のナットを表す図であり、（ａ）は斜視図、（ｂ）は側面図である。It is a figure showing the nut before a thread groove cutting, (a) is a perspective view, (b) is a side view. 断面視で示したナットと第一タップネジの側面図である。It is a side view of a nut and a first tap screw shown in a cross-sectional view. 第一タップネジを非常時係合部に挿入しはじめたときの様子を示す図５と同様の側面図である。It is a side view similar to FIG. 5 which shows a mode when it begins to insert the 1st tap screw in the emergency engaging part. 第一タップネジによってナット全体に雌ネジ孔を切削する様子を示す図５と同様の側面図である。It is a side view similar to FIG. 5 which shows a mode that a female screw hole is cut in the whole nut with a 1st tap screw. 通常螺合部に小径雌ネジ孔を切削しかつ非常時係合部に非常時係合雌ネジ孔を切削したナットの断面図である。It is sectional drawing of the nut which cut the small diameter female screw hole in the normal threading part, and cut the emergency engagement female screw hole in the emergency engagement part. ナットと第二タップネジの図５と同様の側面図である。It is a side view similar to FIG. 5 of a nut and a 2nd tap screw. 第二タップネジの誘い込み部を非常時係合部の非常時係合雌ネジ孔に螺合させた状態を示す図５と同様の側面図である。FIG. 6 is a side view similar to FIG. 5 showing a state in which the guiding portion of the second tap screw is screwed into the emergency engagement female screw hole of the emergency engagement portion. 第二タップネジを図１０の状態からさらにナットの前方へ移動させた様子を示す図５と同様の側面図である。It is a side view similar to FIG. 5 which shows a mode that the 2nd tap screw was further moved ahead of the nut from the state of FIG. 第二タップネジによって通常螺合部全体に通常螺合雌ネジ孔を切削する様子を示す図５と同様の側面図である。It is a side view similar to FIG. 5 which shows a mode that a normal screwing female screw hole is cut in the whole normal screwing part with a 2nd tap screw. 完成状態のナットの断面図である。It is sectional drawing of the nut of a completion state. 本発明の第二の実施形態のナットと第一タップネジの図５と同様の側面図である。It is a side view similar to FIG. 5 of the nut and 1st tap screw of 2nd embodiment of this invention. 第一タップネジによってナット全体に通常螺合雌ネジ孔を切削する様子を示す図５と同様の側面図である。It is a side view similar to FIG. 5 which shows a mode that a normal screwing female screw hole is cut in the whole nut with a 1st tap screw. ナット全体に通常螺合雌ネジ孔を切削したナットの断面図である。It is sectional drawing of the nut which cut the normal screwing female screw hole in the whole nut. ナットと第二タップネジの図５と同様の側面図である。It is a side view similar to FIG. 5 of a nut and a 2nd tap screw. 第二タップネジの誘い込み部を非常時係合部の通常螺合雌ネジ孔に螺合させた状態を示す図５と同様の側面図である。FIG. 6 is a side view similar to FIG. 5 showing a state in which the guiding portion of the second tap screw is screwed into the normal screwing female screw hole of the emergency engagement portion. 第二タップネジによって非常時係合部ナット全体に非常時係合雌ネジ孔を切削する様子を示す図５と同様の側面図である。It is a side view similar to FIG. 5 which shows a mode that the emergency engagement internal thread hole is cut to the whole emergency engagement part nut with a 2nd tap screw. 完成状態のナットの断面図である。It is sectional drawing of the nut of a completion state. 本発明の第三の実施形態の通常螺合部と一体化する前の非常時係合部単品の斜視図である。It is a perspective view of the emergency engagement part single goods before integrating with the normal screwing part of 3rd embodiment of this invention. 第一タップネジによって通常螺合部全体に通常螺合雌ネジ孔を切削する様子を示す図５と同様の側面図である。It is a side view similar to FIG. 5 which shows a mode that a normal screwing female screw hole is cut in the whole normal screwing part with a 1st tap screw. 第二タップネジによって非常時係合部ナット全体に非常時係合雌ネジ孔を切削する様子を示す図５と同様の側面図である。It is a side view similar to FIG. 5 which shows a mode that the emergency engagement internal thread hole is cut to the whole emergency engagement part nut with a 2nd tap screw.

以下、図１−図１３を参照しながら本発明の第一の実施形態について説明する。なお以下の説明中の各方向は図中の矢印方向を基準としている。
本実施形態の送りネジ機構１０は、リードスクリュー１１と、ナット１３と、ウォーム１８と、を具備するものである。 Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. Each direction in the following description is based on the arrow direction in the figure.
The feed screw mechanism 10 according to the present embodiment includes a lead screw 11, a nut 13, and a worm 18.

前後方向に直線的に延びる金属製のリードスクリュー１１は外周面に螺旋状の雄ネジ１２が形成された長尺のロッド状部材である。リードスクリュー１１の前後両端部は図示を省略した支持部材を介して固定部材（図示略）に対して固定してある。
図２に示すようにリードスクリュー１１の外周面に形成した雄ネジ１２は、共に螺旋状の山部１２-１と該山部１２-１の間の谷部１２-２とを有している。山部１２-１は、リードスクリュー１１の中心軸線１１ａに対して所定の角度で正逆に傾斜する一対のフランク面Ｌ１を両側面（前後面）に有する台形断面の突条であり、谷部１２-２は、軸方向に隣接する一対の山部１２-１によって挟まれる台形断面の凹溝である。雄ネジ１２の断面形状（山部１２-１及び谷部１２-２の断面形状）とネジピッチ（中心軸線１１ａに沿う方向で隣接する２つの山部１２-１の間隔。本実施形態では１．５ｍｍ）は、リードスクリュー１１の全体に亘って均一である。本実施形態の山部１２−１の外径（山部１２−１の頂部の径）は８．０ｍｍである。 The metal lead screw 11 linearly extending in the front-rear direction is a long rod-like member having a helical male screw 12 formed on the outer peripheral surface. Both front and rear ends of the lead screw 11 are fixed to a fixing member (not shown) via a support member (not shown).
As shown in FIG. 2, the male screw 12 formed on the outer peripheral surface of the lead screw 11 has a spiral crest 12-1 and a trough 12-2 between the crests 12-1. . The crest 12-1 is a trapezoidal cross-section ridge having a pair of flank surfaces L1 on both side surfaces (front and back surfaces) inclined forward and backward at a predetermined angle with respect to the central axis 11a of the lead screw 11. 12-2 is a concave groove having a trapezoidal cross section sandwiched between a pair of ridges 12-1 adjacent in the axial direction. The cross-sectional shape of the male screw 12 (the cross-sectional shape of the crest 12-1 and the trough 12-2) and the screw pitch (the distance between two crests 12-1 adjacent in the direction along the central axis 11a. 5 mm) is uniform over the entire lead screw 11. The outer diameter of the mountain portion 12-1 of this embodiment (the diameter of the top portion of the mountain portion 12-1) is 8.0 mm.

ナット１３は、互いに同軸をなす筒状部材である通常螺合部１４（第一螺合部）及び非常時係合部１６（第二螺合部）からなる一体物である。
樹脂製の通常螺合部１４は、外周面の前端部を除く部分に形成したウォームギヤ部１４ａと、内部の後端部を除く部分に形成した通常螺合雌ネジ孔１４ｂ（第一雌ネジ孔）と、内部の後端部に形成した通常螺合雌ネジ孔１４ｂと同軸をなす接続孔１４ｃと、を有する。
金属製の非常時係合部１６は、ウォームギヤ部１４ａとほぼ同じ外径サイズの円環状部であるフランジ部１６ａと、フランジ部１６ａから前方へ延びる円筒状の接続部１６ｂと、フランジ部１６ａから後方へ延びる円筒状の後方延長部１６ｃと、を備えている。さらに非常時係合部１６の内部にはその全長に亘って軸方向（前後方向）に延びかつ仕様（径及び山部１６ｄ−１の肉厚（前後幅））が通常螺合雌ネジ孔１４ｂとは異なる非常時係合雌ネジ孔１６ｄ（第二雌ネジ孔）が形成してある。
通常螺合部１４と非常時係合部１６は、接続部１６ｂが接続孔１４ｃに対して嵌合しかつ接続孔１４ｃと非常時係合雌ネジ孔１６ｄが互いに同軸をなす態様で互いに固定状態で一体化してある。 The nut 13 is an integrated body composed of a normal threaded portion 14 (first threaded portion) and an emergency engagement portion 16 (second threaded portion), which are cylindrical members that are coaxial with each other.
The resin-made normal screwing portion 14 includes a worm gear portion 14a formed in a portion excluding the front end portion of the outer peripheral surface and a normal screwing female screw hole 14b (first female screw hole) formed in a portion excluding the rear end portion inside. ) And a connection hole 14c that is coaxial with the normal threaded female screw hole 14b formed at the rear end of the interior.
The metal emergency engagement portion 16 includes a flange portion 16a that is an annular portion having substantially the same outer diameter as the worm gear portion 14a, a cylindrical connection portion 16b that extends forward from the flange portion 16a, and a flange portion 16a. A cylindrical rear extension 16c extending rearward. Further, the emergency engagement portion 16 extends in the axial direction (front-rear direction) over its entire length, and the specifications (diameter and wall thickness (front-rear width) of the peak portion 16d-1) are usually screwed female screw holes 14b. An emergency engagement female screw hole 16d (second female screw hole) different from the above is formed.
The normal threaded portion 14 and the emergency engagement portion 16 are fixed to each other in such a manner that the connection portion 16b fits into the connection hole 14c and the connection hole 14c and the emergency engagement female screw hole 16d are coaxial with each other. It is integrated with.

通常螺合部１４と非常時係合部１６を一体化することにより構成したナット１３の雌ネジ孔（通常螺合雌ネジ孔１４ｂ、非常時係合雌ネジ孔１６ｄ）にはリードスクリュー１１が貫通状態で挿入してある。またナット１３のウォームギヤ部１４ａには、その軸線が中心軸線１１ａに対して直交するウォーム１８が噛合している。さらにウォーム１８は図示を省略したモータと接続しており、モータの出力（回転力）を受けると自身の軸線まわりに回転する。さらに、ナット１３、ウォーム１８、及びモータは、リードスクリュー１１に対して中心軸線１１ａ方向に相対スライド可能なスライド部材（図示略）に支持してある。但し、ナット１３とウォーム１８はスライド部材に対して各々の軸線まわりに回転可能である。
通常螺合部１４の通常螺合雌ネジ孔１４ｂは、雄ネジ１２の谷部１２-２に対応する（略同一断面形状である）台形断面の突条からなる山部１４ｂ−１と、山部１２-１に対応する（略同一断面形状である）台形断面の凹溝からなる谷部１４ｂ−２と、を内周面に螺旋状に形成したネジ孔であり、そのピッチは１．５ｍｍである。山部１４ｂ−１は、雄ネジ１２側のフランク面Ｌ１と傾斜角が共通する一対のフランク面Ｌ２を両側面（前後面）に有しており、リードスクリュー１１（雄ネジ１２）を通常螺合雌ネジ孔１４ｂに螺合するとフランク面Ｌ１に対してフランク面Ｌ２が摺動可能に当接する。この螺合関係によって、リードスクリュー１１の中心軸線１１ａとナット１３（通常螺合部１４）の中心軸が一致する。従って、上記モータが回転してモータの回転力がウォーム１８を介してウォームギヤ部１４ａに伝わると、ナット１３が雄ネジ１２と通常螺合雌ネジ孔１４ｂの螺合関係に従ってリードスクリュー１１に沿って直線移動するので、スライド部材（ウォーム１８、モータ）がリードスクリュー１１に沿って直線移動する。通常螺合部１４は、ビビリ振動や異音を発生することなく、リードスクリュー１１に対して円滑に前後動を行う。 The lead screw 11 is inserted into the female screw hole (normal screw female screw hole 14b, emergency engagement female screw hole 16d) of the nut 13 constituted by integrating the normal screw part 14 and the emergency engagement part 16 together. It has been inserted through. The worm gear 14a of the nut 13 is engaged with a worm 18 whose axis is orthogonal to the central axis 11a. Further, the worm 18 is connected to a motor (not shown), and rotates around its own axis when receiving the output (rotational force) of the motor. Further, the nut 13, the worm 18, and the motor are supported by a slide member (not shown) that can slide relative to the lead screw 11 in the direction of the central axis 11 a. However, the nut 13 and the worm 18 can rotate around their respective axes with respect to the slide member.
The normal screwing female screw hole 14b of the normal screwing part 14 includes a peak part 14b-1 composed of a protrusion having a trapezoidal cross section corresponding to the valley part 12-2 of the male screw 12, and a peak. A screw hole in which a trough portion 14b-2 made of a concave groove having a trapezoidal cross section (having substantially the same cross-sectional shape) corresponding to the portion 12-1 is formed in a spiral shape on the inner peripheral surface, and the pitch thereof is 1.5 mm. It is. The mountain portion 14b-1 has a pair of flank surfaces L2 having the same inclination angle as the flank surface L1 on the male screw 12 side on both side surfaces (front and rear surfaces), and the lead screw 11 (male screw 12) is normally screwed. When the female screw hole 14b is screwed, the flank surface L2 is slidably brought into contact with the flank surface L1. Due to this screwing relationship, the central axis 11a of the lead screw 11 and the central axis of the nut 13 (usually the screwing portion 14) coincide. Accordingly, when the motor rotates and the rotational force of the motor is transmitted to the worm gear portion 14a via the worm 18, the nut 13 follows the lead screw 11 according to the screwing relationship between the male screw 12 and the normal screwing female screw hole 14b. Since it moves linearly, the slide member (worm 18, motor) moves linearly along the lead screw 11. Usually, the screwing portion 14 smoothly moves back and forth with respect to the lead screw 11 without generating chatter vibration or abnormal noise.

非常時係合部１６の非常時係合雌ネジ孔１６ｄは、通常螺合雌ネジ孔１４ｂと同様に、台形断面の突条からなる山部１６ｄ−１と台形断面の凹溝からなる谷部１６ｄ−２を内周面に螺旋状に形成したネジ孔であり、そのピッチは１．５ｍｍである。但し、その内径サイズ（仕様）は通常螺合雌ネジ孔１４ｂよりも大きく設定してある。図２のＤ１は山部１４ｂ−１の歯先位置を基準とした通常螺合雌ネジ孔１４ｂの内径サイズを示し、同図のＤ２は山部１６ｄ−１の歯先位置を基準とした非常時係合雌ネジ孔１６ｄの内径サイズを示しており、Ｄ２＞Ｄ１の関係になっている。ただし、Ｄ１、Ｄ２はともに山部１２−１の外径より小さい。図２では歯先基準で示しているが、谷部１４ｂ−２の歯底位置と谷部１６ｄ−２の歯底位置を基準とした場合も、通常螺合雌ネジ孔１４ｂより非常時係合雌ネジ孔１６ｄの方が大きい内径サイズになっている。なお本実施形態では谷部１４ｂ−２の歯底位置を基準とした通常螺合雌ネジ孔１４ｂの内径サイズは８．３ｍｍであり、谷部１６ｄ−２の歯底位置を基準とした非常時係合雌ネジ孔１６ｄの内径サイズは８．７ｍｍである。山部１６ｄ−１は、雄ネジ１２のフランク面Ｌ１や通常螺合雌ネジ孔１４ｂ（山部１４ｂ−１）のフランク面Ｌ２と傾斜角が共通する一対のフランク面Ｌ３を両側面（前後面）に有している。しかし、雄ネジ１２に対して螺合する通常螺合雌ネジ孔１４ｂよりも非常時係合雌ネジ孔１６ｄの内径サイズを大きく設定してあり、さらに山部１６ｄ−１の肉厚（前後幅。仕様）は山部１４ｂ−１の肉厚より小さい。そのため通常時は非常時係合雌ネジ孔１６ｄは雄ネジ１２に対して螺合せず（接触せず）、フランク面Ｌ１に対してフランク面Ｌ３が離間する。
非常時係合部１６は、上記スライド部材に対してスライド方向への通常使用状態を超える過大荷重が作用したときに、リードスクリュー１１に対するナット１３の移動を規制する補強用のストッパとして機能する。即ち、スライド部材に対して上記過大荷重が瞬間的に加わった場合には、通常螺合部１４の通常螺合雌ネジ孔１４ｂにおける山部１４ｂ−１が撓んでリードスクリュー１１とナット１３の軸方向の相対的な位置関係が変化する。この位置変化が所定以上に大きくなると、非常時係合部１６の非常時係合雌ネジ孔１６ｄ（フランク面Ｌ３）がリードスクリュー１１の雄ネジ１２（フランク面Ｌ１）に係合し、この係合によってリードスクリュー１１に対する非常時係合部１６（ナット１３）の軸方向移動が規制される。非常時係合部１６は通常螺合部１４よりも硬質（剛性が高い）の材質（金属）により構成してあるので、過大荷重に起因するナット１３のスライドを規制するストッパとして確実に機能する。 The emergency engagement female screw hole 16d of the emergency engagement portion 16 is similar to the normal screwing female screw hole 14b, and has a peak portion 16d-1 formed of a trapezoidal cross-section protrusion and a trough portion formed of a trapezoidal cross-section groove. 16d-2 is a screw hole formed on the inner peripheral surface in a spiral shape, and the pitch thereof is 1.5 mm. However, the inner diameter size (specification) is set larger than that of the normal threaded female screw hole 14b. D1 in FIG. 2 indicates the inner diameter size of the normal threaded female screw hole 14b with reference to the tooth tip position of the peak portion 14b-1, and D2 in FIG. 2 is an emergency based on the tooth tip position of the peak portion 16d-1. The inner diameter size of the hourly engaging female screw hole 16d is shown, and the relationship D2> D1 is established. However, both D1 and D2 are smaller than the outer diameter of the mountain portion 12-1. In FIG. 2, the tooth tip is shown as a reference, but even when the root position of the valley portion 14 b-2 and the root position of the valley portion 16 d-2 are used as a reference, it is usually engaged in an emergency from the threaded female screw hole 14 b. The internal thread size of the female screw hole 16d is larger. In the present embodiment, the inner diameter size of the normal threaded female screw hole 14b based on the root position of the valley portion 14b-2 is 8.3 mm, and an emergency is performed based on the root position of the valley portion 16d-2. The inner diameter size of the engaging female screw hole 16d is 8.7 mm. The ridge 16d-1 has a pair of flank L3 having a common inclination angle with the flank L1 of the male screw 12 and the flank L2 of the normal threaded female screw hole 14b (ridge 14b-1). ). However, the inner diameter size of the emergency engagement female screw hole 16d is set larger than that of the normal screw female screw hole 14b screwed to the male screw 12, and the thickness (front-rear width) of the peak portion 16d-1 is further increased. The specification is smaller than the thickness of the crest 14b-1. Therefore, in the normal state, the emergency engagement female screw hole 16d is not screwed (not in contact) with the male screw 12, and the flank surface L3 is separated from the flank surface L1.
The emergency engagement portion 16 functions as a reinforcing stopper that restricts the movement of the nut 13 relative to the lead screw 11 when an excessive load exceeding the normal use state in the sliding direction is applied to the slide member. That is, when the excessive load is momentarily applied to the slide member, the peak portion 14b-1 in the normal screwing female screw hole 14b of the normal screwing portion 14 is bent, and the shaft of the lead screw 11 and the nut 13 is bent. The relative positional relationship of directions changes. When this position change becomes larger than a predetermined value, the emergency engagement female screw hole 16d (flank surface L3) of the emergency engagement portion 16 engages with the male screw 12 (flank surface L1) of the lead screw 11, and this engagement Accordingly, the axial movement of the emergency engagement portion 16 (nut 13) with respect to the lead screw 11 is restricted. Since the emergency engagement portion 16 is made of a material (metal) that is harder (higher rigidity) than the normal screw portion 14, the emergency engagement portion 16 functions reliably as a stopper that restricts the sliding of the nut 13 caused by an excessive load. .

続いて、以上説明した機能を発揮可能なナット１３の製造方法について説明する。
まず内部にネジ溝を具備しない貫通孔が形成してある（通常螺合雌ネジ孔１４ｂ、非常時係合雌ネジ孔１６ｄが形成されていない）通常螺合部１４と非常時係合部１６を用意し、この通常螺合部１４と非常時係合部１６を固定状態で一体化する。通常螺合部１４と非常時係合部１６の一体化は、例えば図３に示す非常時係合部１６を成形型（図示略）内に位置させながら（通常螺合部１４を構成する）流動性樹脂材料を成形型内に射出し、樹脂材料が通常螺合部１４の形状をなしながら硬化した後に成形型を離型するインサート成形により実現できる。また、樹脂材料によって（通常螺合雌ネジ孔１４ｂが形成されていない）通常螺合部１４を予め成形した後に、この通常螺合部１４と非常時係合部１６を固定手段（例えば、通常螺合部１４と非常時係合部１６の間に形成したセレーション嵌合構造）によって固定してもよい。 Then, the manufacturing method of the nut 13 which can exhibit the function demonstrated above is demonstrated.
First, a through hole not having a thread groove is formed therein (normally screwed female screw hole 14b and emergency engagement female screw hole 16d are not formed). Is prepared, and the normal threaded portion 14 and the emergency engagement portion 16 are integrated in a fixed state. The normal screwing portion 14 and the emergency engagement portion 16 are integrated, for example, while the emergency engagement portion 16 shown in FIG. 3 is positioned in a mold (not shown) (the normal screwing portion 14 is configured). It can be realized by insert molding in which a flowable resin material is injected into a mold, and the mold is released after the resin material is normally cured while forming the shape of the threaded portion 14. Further, after the normal threaded portion 14 is formed in advance by a resin material (normally the threaded female screw hole 14b is not formed), the normal threaded portion 14 and the emergency engagement portion 16 are fixed to a fixing means (for example, normal You may fix by the serration fitting structure formed between the screwing part 14 and the emergency engaging part 16.

続いて、図５−図７に示す第一タップネジ２０を用意し、図示を省略したホルダによってその軸線を前後方向に向けながら固定状態で支持する。
第一タップネジ２０は通常螺合部１４及び非常時係合部１６より硬質の金属によって構成した直線状の部材である。第一タップネジ２０の前部は小径部２０Ａにより構成してあり、第一タップネジ２０には小径部２０Ａより大径の大径部２０Ｂが形成してあり、さらに小径部２０Ａと大径部２０Ｂの間は大径部２０Ｂ側から小径部２０Ａ側に向かうにつれて縮径する傾斜部２０Ｃにより構成してある。さらに小径部２０Ａ、大径部２０Ｂ、傾斜部２０Ｃには１．５ｍｍのピッチで連続する単一の雄ネジ２１が形成してある。この雄ネジは、小径部２０Ａに形成した小径ネジ孔形成部２１Ａと、大径部２０Ｂに形成した非常時係合雌ネジ孔形成部２１Ｂ（第二ネジ孔形成部）と、傾斜部２０Ｃに形成した傾斜ネジ孔形成部２１Ｃとからなるものである。小径ネジ孔形成部２１Ａは通常螺合雌ネジ孔１４ｂ（山部１４ｂ−１、谷部１４ｂ−２）より小径の雄ネジ部であり、その山部の外径は７．５ｍｍである。非常時係合雌ネジ孔形成部２１Ｂは非常時係合雌ネジ孔１６ｄ（山部１６ｄ−１、谷部１６ｄ−２）に対応する形状（略同一断面形状である）であり（小径ネジ孔形成部２１Ａ及び後述する通常螺合雌ネジ孔形成部２６Ｂより大径であり）、その山部の外径は８．７ｍｍである。さらに小径部２０Ａ、大径部２０Ｂ、傾斜部２０Ｃの外周面には螺旋溝からなりかつ両端が開口する切削屑排出溝２２が凹設してある。
続いて、ナット１３を図示を省略した回転直線手段によって支持しながら、図５に示すようにナット１３を第一タップネジ２０の直前に同軸状態で位置させる。そして回転直線手段が、ナット１３を前方から見たときに反時計方向に回転させながらナット１３を後方へ直進移動させる。すると小径部２０Ａの前端部が後方延長部１６ｃの内部孔に嵌合し（図６参照）、やがて小径部２０Ａの前端部がナット１３の前方へ突出する。そして図７に示すように非常時係合雌ネジ孔形成部２１Ｂの前端と非常時係合部１６（接続部１６ｂ）の前端が一致したときに上記回転直線手段（規制手段）が回転及び直線移動を停止する。このように第一タップネジ２０によって通常螺合部１４及び非常時係合部１６を切削すると、非常時係合部１６の内部全体に非常時係合雌ネジ孔１６ｄ（山部１６ｄ−１、谷部１６ｄ−２）が形成される。また通常螺合部１４の内部の後端部を除く部分全体に通常螺合雌ネジ孔１４ｂ（及び非常時係合雌ネジ孔１６ｄ）より小径の小径雌ネジ孔１４ｄが形成される。さらに通常螺合部１４の内部の後端部には、非常時係合雌ネジ孔１６ｄの前端と小径雌ネジ孔１４ｄの後端とをつなぐ形状の傾斜雌ネジ孔１４ｅが形成される。これら非常時係合雌ネジ孔１６ｄの谷部１６ｄ−２、傾斜雌ネジ孔１４ｅの谷部、及び小径雌ネジ孔１４ｄの谷部は互いに連通している。さらに通常螺合部１４及び非常時係合部１６から生じた切削屑が切削屑排出溝２２によって第一タップネジ２０の前方へ排出されるので、これらの切削屑はナット１３から前方へ排出される。
さらに回転直線手段は、この後にナット１３を前方から見たときに時計方向に回転させながらナット１３を前方へ移動させて、ナット１３全体を第一タップネジ２０から前方へ引き抜く。 Subsequently, the first tap screw 20 shown in FIGS. 5 to 7 is prepared, and supported in a fixed state while its axis is directed in the front-rear direction by a holder (not shown).
The first tap screw 20 is a linear member constituted by a metal harder than the normal threaded portion 14 and the emergency engagement portion 16. The front portion of the first tap screw 20 is constituted by a small diameter portion 20A. The first tap screw 20 is formed with a large diameter portion 20B having a diameter larger than that of the small diameter portion 20A. Further, the first tap screw 20 includes a small diameter portion 20A and a large diameter portion 20B. The gap is formed by an inclined portion 20C that decreases in diameter from the large diameter portion 20B side toward the small diameter portion 20A side. Furthermore, a single male screw 21 continuous at a pitch of 1.5 mm is formed on the small diameter portion 20A, the large diameter portion 20B, and the inclined portion 20C. This male screw is connected to the small diameter screw hole forming portion 21A formed in the small diameter portion 20A, the emergency engagement female screw hole forming portion 21B (second screw hole forming portion) formed in the large diameter portion 20B, and the inclined portion 20C. It consists of the formed inclined screw hole forming portion 21C. The small-diameter screw hole forming portion 21A is a male screw portion having a diameter smaller than that of the normal screw-in female screw hole 14b (the peak portion 14b-1 and the valley portion 14b-2), and the outer diameter of the peak portion is 7.5 mm. The emergency engagement female screw hole forming portion 21B has a shape (substantially the same cross-sectional shape) corresponding to the emergency engagement female screw hole 16d (mountain portion 16d-1, trough portion 16d-2) (small diameter screw hole). The outer diameter of the crest portion is 8.7 mm, which is larger than the diameter of the forming portion 21A and a normal threaded female screw hole forming portion 26B described later). Further, on the outer peripheral surfaces of the small-diameter portion 20A, the large-diameter portion 20B, and the inclined portion 20C, a cutting waste discharge groove 22 made of a spiral groove and open at both ends is recessed.
Subsequently, the nut 13 is positioned in a coaxial state immediately before the first tap screw 20 as shown in FIG. Then, the rotating linear means moves the nut 13 straight forward while rotating the nut 13 counterclockwise when viewed from the front. Then, the front end portion of the small diameter portion 20A is fitted into the inner hole of the rear extension portion 16c (see FIG. 6), and the front end portion of the small diameter portion 20A eventually protrudes forward of the nut 13. Then, as shown in FIG. 7, when the front end of the emergency engagement female screw hole forming portion 21B and the front end of the emergency engagement portion 16 (connecting portion 16b) coincide with each other, the rotation linear means (regulating means) is rotated and straightened. Stop moving. When the normal threaded portion 14 and the emergency engagement portion 16 are cut by the first tap screw 20 in this way, the emergency engagement female screw hole 16d (peak portion 16d-1, trough 16) is formed in the entire inside of the emergency engagement portion 16. Part 16d-2) is formed. A small-diameter female screw hole 14d having a smaller diameter than the normal screw female screw hole 14b (and the emergency engagement female screw hole 16d) is formed in the entire portion of the normal screw part 14 except for the rear end. Furthermore, an inclined female screw hole 14e having a shape connecting the front end of the emergency engagement female screw hole 16d and the rear end of the small-diameter female screw hole 14d is formed at the rear end portion inside the normal threaded portion 14. The trough 16d-2 of the emergency engagement female screw hole 16d, the trough of the inclined female screw hole 14e, and the trough of the small-diameter female screw hole 14d communicate with each other. Furthermore, since the cutting waste generated from the normal screwing portion 14 and the emergency engagement portion 16 is discharged to the front of the first tap screw 20 by the cutting waste discharge groove 22, these cutting waste is discharged forward from the nut 13. .
Further, the rotation linear means thereafter moves the nut 13 forward while rotating the nut 13 clockwise when viewed from the front, and pulls the entire nut 13 forward from the first tap screw 20.

続いて、上記ホルダから第一タップネジ２０を取り外した後に、該ホルダによって図９−図１２に示す第二タップネジ２５を第一タップネジ２０と同じ態様により固定状態で支持する（図９参照）。
第二タップネジ２５は通常螺合部１４及び非常時係合部１６より硬質の金属によって構成した直線状の部材である。第二タップネジ２５の前部は誘い込み部２５Ａにより構成してあり、第二タップネジ２５の後端部を含む大部分は誘い込み部２５Ａより大径の中間径部２５Ｂにより構成してあり、さらに誘い込み部２５Ａと中間径部２５Ｂの間は中間接続部２５Ｃにより構成してある。中間接続部２５Ｃは全体が中間径部２５Ｂより小径であり、中間接続部２５Ｃの前部は誘い込み部２５Ａより小径である。さらに誘い込み部２５Ａ、中間径部２５Ｂ、中間接続部２５Ｃには１．５ｍｍのピッチで連続しかつ雄ネジ２１とは仕様が異なる単一の雄ネジ２６が形成してある。この雄ネジは、誘い込み部２５Ａに形成した誘い込み雄ネジ部２６Ａと、中間径部２５Ｂに形成した通常螺合雌ネジ孔形成部２６Ｂ（第一ネジ孔形成部）と、中間接続部２５Ｃに形成した誘い込み雄ネジ部２６Ａと通常螺合雌ネジ孔形成部２６Ｂを接続する雄ネジ部とからなるものである。誘い込み雄ネジ部２６Ａは非常時係合雌ネジ孔１６ｄ（非常時係合雌ネジ孔形成部２１Ｂ）及び通常螺合雌ネジ孔１４ｂ（通常螺合雌ネジ孔形成部２６Ｂ）より小径の雄ネジ部である。通常螺合雌ネジ孔形成部２６Ｂは通常螺合雌ネジ孔１４ｂと対応する形状（山部の外径が８．３ｍｍ）の雄ネジ部である。即ち、通常螺合雌ネジ孔形成部２６Ｂは小径ネジ孔形成部２１Ａより大径かつ非常時係合雌ネジ孔形成部２１Ｂより小径である。さらに誘い込み部２５Ａ、中間径部２５Ｂ、中間接続部２５Ｃの外周面には、螺旋溝からなりかつ両端が開口する切削屑排出溝２７が凹設してある。
図９の状態で上記回転直線手段が、ナット１３を前方から見たときに反時計方向に回転させながらナット１３を後方へ直進移動させる。
すると誘い込み雄ネジ部２６Ａが非常時係合部１６の非常時係合雌ネジ孔１６ｄに遊嵌し（図１０参照）、さらに通常螺合雌ネジ孔形成部２６Ｂが非常時係合雌ネジ孔１６ｄに遊嵌する（図１１参照）。やがて通常螺合雌ネジ孔形成部２６Ｂが小径雌ネジ孔１４ｄ及び傾斜雌ネジ孔１４ｅを切削してこれらを拡径する（小径雌ネジ孔１４ｄ及び傾斜雌ネジ孔１４ｅの谷部の深さ及び前後幅を大きくし、山部の前後方向の厚みを薄くする）ことにより、通常螺合部１４に通常螺合雌ネジ孔１４ｂを形成し、さらに誘い込み部２５Ａと中間接続部２５Ｃがナット１３の前方へ突出しかつ中間径部２５Ｂの前端部がナット１３の前方へ突出する。そして図１２に示すように、中間径部２５Ｂのナット１３の前方への突出量が所定量となったときに上記回転直線手段（規制手段）が回転及び直線移動を停止する。このように第二タップネジ２５によって通常螺合部１４を切削すると、通常螺合部１４の内部全体（通常螺合雌ネジ孔１４ｂと傾斜雌ネジ孔１４ｅが形成してあった部位）に通常螺合雌ネジ孔１４ｂ（山部１４ｂ−１、谷部１４ｂ−２）が形成される。さらに通常螺合部１４から生じた切削屑（及び、第一タップネジ２０による切削時に非常時係合部１６から生じた切削屑が通常螺合部１４内に残留していた場合は当該切削屑）が切削屑排出溝２７によって第二タップネジ２５の前方へ排出されるので、これらの切削屑はナット１３から前方へ排出される。
さらに回転直線手段は、この後にナット１３を前方から見たときに時計方向に回転させながらナット１３を前方へ移動させて、ナット１３全体を第二タップネジ２５から前方へ引き抜く。すると図１３に示すようにナット１３の完成品が得られる。 Subsequently, after the first tap screw 20 is removed from the holder, the second tap screw 25 shown in FIGS. 9 to 12 is supported by the holder in a fixed state in the same manner as the first tap screw 20 (see FIG. 9).
The 2nd tap screw 25 is a linear member comprised with the metal harder than the normal screwing part 14 and the emergency engaging part 16. FIG. The front part of the second tap screw 25 is constituted by a guide part 25A, and most of the second tap screw 25 including the rear end part is constituted by an intermediate diameter part 25B having a diameter larger than that of the guide part 25A. An intermediate connection portion 25C is configured between 25A and the intermediate diameter portion 25B. The intermediate connection part 25C has a smaller diameter than the intermediate diameter part 25B as a whole, and the front part of the intermediate connection part 25C has a smaller diameter than the guiding part 25A. Further, a single male screw 26 that is continuous at a pitch of 1.5 mm and has a specification different from that of the male screw 21 is formed in the guide portion 25A, the intermediate diameter portion 25B, and the intermediate connection portion 25C. This male screw is formed in the guiding male screw portion 26A formed in the guiding portion 25A, the normal threaded female screw hole forming portion 26B (first screw hole forming portion) formed in the intermediate diameter portion 25B, and the intermediate connecting portion 25C. The guiding male screw portion 26A and the male screw portion that connects the normal threaded female screw hole forming portion 26B. The lead-in male screw portion 26A is a male screw having a smaller diameter than the emergency engagement female screw hole 16d (emergency engagement female screw hole forming portion 21B) and the normal screwing female screw hole 14b (normal screwing female screw hole forming portion 26B). Part. The normal threaded female screw hole forming portion 26B is a male screw portion having a shape corresponding to the normal threaded female screw hole 14b (the outer diameter of the crest is 8.3 mm). That is, the normal threaded female screw hole forming portion 26B is larger in diameter than the small diameter screw hole forming portion 21A and smaller in diameter than the emergency engagement female screw hole forming portion 21B. Further, on the outer peripheral surfaces of the guide portion 25A, the intermediate diameter portion 25B, and the intermediate connection portion 25C, a cutting waste discharge groove 27 that is formed of a spiral groove and that is open at both ends is provided as a recess.
In the state of FIG. 9, the rotating linear means moves the nut 13 straight forward while rotating the nut 13 counterclockwise when viewed from the front.
Then, the lead-in male screw portion 26A is loosely fitted in the emergency engagement female screw hole 16d of the emergency engagement portion 16 (see FIG. 10), and the normal threaded female screw hole forming portion 26B is further in the emergency engagement female screw hole. It loosely fits in 16d (see FIG. 11). Eventually, the normal threaded female screw hole forming portion 26B cuts the small-diameter female screw hole 14d and the inclined female screw hole 14e to increase their diameters (the depth of the valley of the small-diameter female screw hole 14d and the inclined female screw hole 14e and By increasing the front-rear width and reducing the thickness of the peak portion in the front-rear direction, a normal threaded female screw hole 14 b is formed in the normal threaded part 14, and the guiding part 25 A and the intermediate connection part 25 C are further connected to the nut 13. The front end portion of the intermediate diameter portion 25 </ b> B protrudes forward of the nut 13. Then, as shown in FIG. 12, the rotation linear means (regulating means) stops the rotation and linear movement when the amount of protrusion of the intermediate diameter portion 25B toward the front of the nut 13 reaches a predetermined amount. When the normal threaded portion 14 is cut by the second tap screw 25 in this way, the normal screw is formed in the entire interior of the normal threaded portion 14 (the portion where the normal threaded female screw hole 14b and the inclined female screw hole 14e have been formed). Combined female screw holes 14b (ridges 14b-1 and valleys 14b-2) are formed. Furthermore, the cutting waste generated from the normal screwing portion 14 (and the cutting waste generated from the emergency engagement portion 16 when cutting by the first tap screw 20 remains in the normal screwing portion 14). Is discharged to the front of the second tap screw 25 by the cutting waste discharge groove 27, so that these cutting waste is discharged forward from the nut 13.
Further, the rotation linear means thereafter moves the nut 13 forward while rotating the nut 13 clockwise when viewed from the front, and pulls the entire nut 13 forward from the second tap screw 25. Then, a finished product of the nut 13 is obtained as shown in FIG.

以上説明したように本実施形態では通常螺合部１４と非常時係合部１６を一体化した上で通常螺合部１４と非常時係合部１６に跨る雌ネジ孔（通常螺合雌ネジ孔１４ｂ、非常時係合雌ネジ孔１６ｄ）を第一タップネジ２０及び第二タップネジ２５を利用して形成するので、通常螺合部１４に形成した通常螺合雌ネジ孔１４ｂ（の谷部１４ｂ−２）と非常時係合部１６に形成した非常時係合雌ネジ孔１６ｄ（の谷部１６ｄ−２）どうしを互いに精度よく連通（山部１４ｂ−１と山部１６ｄ−１を連続）させながら（両者の回転方向の位相を合わせながら）ナット１３を容易に製造できる。 As described above, in this embodiment, the normal screwing portion 14 and the emergency engagement portion 16 are integrated, and then the female screw hole (normal screwing female screw) straddling the normal screwing portion 14 and the emergency engagement portion 16 is used. Since the hole 14b and the emergency engagement female screw hole 16d) are formed by using the first tap screw 20 and the second tap screw 25, the normal screw female screw hole 14b (the valley portion 14b) formed in the normal screw part 14 is formed. -2) and the emergency engagement female screw holes 16d (the valley portions 16d-2) formed in the emergency engagement portion 16 are accurately communicated with each other (the crest portion 14b-1 and the crest portion 16d-1 are continuously connected). The nut 13 can be easily manufactured while adjusting the phase in the rotational direction of both.

続いて本発明の第二の実施形態について図１４−図２０を参照しながら説明する。なお第一の実施形態と同じ部材には同じ符号を付すに止めて、その詳細な説明は省略する。
本実施形態では第一の実施形態とは異なる第一タップネジ３０と第二タップネジ３５を利用してナット１３に通常螺合雌ネジ孔１４ｂと非常時係合雌ネジ孔１６ｄを形成する。
第一タップネジ３０は通常螺合部１４及び非常時係合部１６より硬質の金属によって構成した直線状の部材である。第一タップネジ３０の外径は全長に亘って同一であり、外周面全体に亘って１．５ｍｍのピッチで連続する単一の通常螺合雌ネジ孔形成部３１（雄ネジ）（第一ネジ孔形成部）が形成してある。この通常螺合雌ネジ孔形成部３１は通常螺合雌ネジ孔１４ｂ（山部１４ｂ−１、谷部１４ｂ−２）に対応する形状（略同一断面形状である。即ち、通常螺合雌ネジ孔形成部２６Ｂと同一仕様）であり、その山部の外径は８．３ｍｍである。さらに通常螺合雌ネジ孔形成部３１の外周面には、螺旋溝からなりかつ両端が開口する切削屑排出溝３２が凹設してある。
第二タップネジ３５は非常時係合部１６より硬質の金属によって構成した直線状の部材である。第二タップネジ３５の前部は誘い込み部３５Ａにより構成してあり、第二タップネジ３５の中間部には誘い込み部３５Ａより大径の大径部３５Ｂが形成してあり、さらに誘い込み部３５Ａと大径部３５Ｂの間は中間接続部３５Ｃにより構成してある。中間接続部３５Ｃは全体が大径部３５Ｂより小径であり、中間接続部３５Ｃの前部は誘い込み部３５Ａより小径である。さらに誘い込み部３５Ａ、大径部３５Ｂ、中間接続部３５Ｃには１．５ｍｍのピッチで連続する単一の雄ネジ３６が形成してある。この雄ネジ３６は、誘い込み部３５Ａに形成した誘い込み雄ネジ部３６Ａと、大径部３５Ｂに形成した非常時係合雌ネジ孔形成部３６Ｂ（第二ネジ孔形成部）と、中間接続部２５Ｃに形成した誘い込み雄ネジ部３６Ａと非常時係合雌ネジ孔形成部３６Ｂを接続する雄ネジ部とからなるものである。誘い込み雄ネジ部３６Ａは誘い込み雄ネジ部２６Ａと同一仕様の雄ネジ部であり、非常時係合雌ネジ孔形成部３６Ｂは非常時係合雌ネジ孔形成部２１Ｂと同一仕様の雄ネジ部である。さらに誘い込み部２５Ａ、中間径部２５Ｂ、中間接続部２５Ｃの外周面には、螺旋溝からなりかつ両端が開口する切削屑排出溝３７が凹設してある。 Next, a second embodiment of the present invention will be described with reference to FIGS. The same members as those in the first embodiment are designated by the same reference numerals, and detailed description thereof is omitted.
In the present embodiment, the first threaded screw 30 and the second threaded screw 35 different from the first embodiment are used to form a normal threaded female threaded hole 14b and an emergency engaging female threaded hole 16d in the nut 13.
The first tap screw 30 is a linear member made of a metal that is harder than the normal threading portion 14 and the emergency engagement portion 16. The outer diameter of the first tap screw 30 is the same over the entire length, and a single normal threaded female screw hole forming portion 31 (male screw) (first screw) that continues at a pitch of 1.5 mm over the entire outer peripheral surface. A hole forming part) is formed. The normal threaded female screw hole forming portion 31 has a shape (substantially the same cross-sectional shape) corresponding to the normal threaded female screw hole 14b (mountain portion 14b-1, trough portion 14b-2). The same specification as the hole forming portion 26B), and the outer diameter of the peak portion is 8.3 mm. Further, a cutting waste discharge groove 32 which is formed of a spiral groove and is open at both ends is formed in the outer peripheral surface of the normal threaded female screw hole forming portion 31.
The second tap screw 35 is a linear member made of a metal harder than the emergency engagement portion 16. The front portion of the second tap screw 35 is constituted by a lead-in portion 35A, and a large-diameter portion 35B having a diameter larger than that of the lead-in portion 35A is formed at an intermediate portion of the second tap screw 35. The portion 35B is constituted by an intermediate connection portion 35C. The intermediate connection part 35C has a smaller diameter than the large diameter part 35B as a whole, and the front part of the intermediate connection part 35C has a smaller diameter than the guiding part 35A. Furthermore, a single male screw 36 that is continuous at a pitch of 1.5 mm is formed in the guide portion 35A, the large diameter portion 35B, and the intermediate connection portion 35C. The male screw 36 includes a guiding male screw portion 36A formed in the guiding portion 35A, an emergency engagement female screw hole forming portion 36B (second screw hole forming portion) formed in the large diameter portion 35B, and an intermediate connecting portion 25C. The guide male thread part 36A formed in the above and the male thread part for connecting the emergency engagement female thread hole forming part 36B. The guide male screw portion 36A is a male screw portion having the same specifications as the guide male screw portion 26A, and the emergency engagement female screw hole forming portion 36B is a male screw portion having the same specification as the emergency engagement female screw hole forming portion 21B. is there. Further, on the outer peripheral surfaces of the guide portion 25A, the intermediate diameter portion 25B, and the intermediate connection portion 25C, a cutting waste discharge groove 37 that is formed of a spiral groove and that is open at both ends is provided as a recess.

上記ホルダによって第一タップネジ３０をその軸線を前後方向に向けながら固定状態で支持し、かつ、ネジ溝を具備しない貫通孔が形成してあるナット１３を上記回転直線手段によって支持し、図１４に示すようにナット１３を第一タップネジ３０の直後に同軸状態で位置させる。そして回転直線手段が、ナット１３を前方から見たときに反時計方向に回転させながらナット１３を前方へ直進移動させる。すると第一タップネジ３０が通常螺合部１４及び非常時係合部１６の内部孔に対して通常螺合部１４側から嵌合し、やがて第一タップネジ３０の後端部がナット１３の後方へ突出する。そして図１５に示すように第一タップネジ３０のナット１３からの突出量が所定量となったときに上記回転直線手段（規制手段）が回転及び直線移動を停止する。このように第一タップネジ３０によって通常螺合部１４及び非常時係合部１６を切削すると、通常螺合部１４及び非常時係合部１６の内部全体に（通常螺合部１４及び非常時係合部１６に跨る）通常螺合雌ネジ孔１４ｂ（山部１４ｂ−１、谷部１４ｂ−２）が形成される。さらに通常螺合部１４及び非常時係合部１６から生じた切削屑が切削屑排出溝３２によって第一タップネジ３０の後方へ排出されるので、これらの切削屑はナット１３から後方へ排出される。
さらに回転直線手段は、この後にナット１３を前方から見たときに時計方向に回転させながらナット１３を後方へ移動させて、ナット１３全体を第一タップネジ３０から後方へ引き抜く。 The first tap screw 30 is supported by the holder in a fixed state with its axis directed in the front-rear direction, and the nut 13 formed with a through hole not provided with a thread groove is supported by the rotating linear means. As shown, the nut 13 is positioned coaxially immediately after the first tap screw 30. The rotating linear means moves the nut 13 straight forward while rotating the nut 13 counterclockwise when the nut 13 is viewed from the front. Then, the first tap screw 30 is fitted from the normal screwing portion 14 side to the internal holes of the normal screwing portion 14 and the emergency engagement portion 16, and eventually the rear end portion of the first tap screw 30 moves to the rear of the nut 13. Protruding. And as shown in FIG. 15, when the protrusion amount from the nut 13 of the 1st tap screw 30 becomes a predetermined amount, the said rotation linear means (regulation means) stops rotation and linear movement. When the normal threaded portion 14 and the emergency engagement portion 16 are cut by the first tap screw 30 in this way, the entire inside of the normal screwed portion 14 and the emergency engagement portion 16 (the normal threaded portion 14 and the emergency engagement portion). A normal threaded female screw hole 14b (crest portion 14b-1, trough portion 14b-2) is formed. Furthermore, since the cutting waste generated from the normal screwing portion 14 and the emergency engagement portion 16 is discharged to the rear of the first tap screw 30 by the cutting waste discharge groove 32, these cutting waste is discharged rearward from the nut 13. .
Further, the rotation linear means thereafter moves the nut 13 backward while rotating the nut 13 clockwise when viewed from the front, and pulls the entire nut 13 backward from the first tap screw 30.

続いて、上記ホルダから第一タップネジ３０を取り外した後に、該ホルダによって図１７−図１９に示す第二タップネジ３５を固定状態で支持し、ナット１３を第二タップネジ３５の直前に同軸状態で位置させる（図１７参照）。
この状態で上記回転直線手段が、ナット１３を前方から見たときに時計方向に回転させながらナット１３を後方へ直進移動させる。
すると誘い込み雄ネジ部３６Ａが非常時係合部１６の通常螺合雌ネジ孔１４ｂに遊嵌し（図１８参照）、やがて誘い込み雄ネジ部３６Ａが通常螺合部１４の通常螺合雌ネジ孔１４ｂに遊嵌し、さらに非常時係合雌ネジ孔形成部３６Ｂが非常時係合部１６の通常螺合雌ネジ孔１４ｂを切削してその谷部１４ｂ−２の深さ及び前後幅を大きくし山部１４ｂ−１の前後方向の厚みを薄くする。そして図１９に示すように、非常時係合雌ネジ孔形成部３６Ｂの前端位置が非常時係合部１６の前端位置と一致したときに上記回転直線手段（規制手段）が回転及び直線移動を停止する。このように第二タップネジ３５の非常時係合雌ネジ孔形成部３６Ｂによって非常時係合部１６を切削すると、非常時係合部１６の内部全体（通常螺合雌ネジ孔１４ｂが形成してあった部位）に非常時係合雌ネジ孔１６ｄ（山部１６ｄ−１、谷部１６ｄ−２）が形成される（このとき、通常螺合部１４内における通常螺合雌ネジ孔１４ｂのピッチ数より非常時係合雌ネジ孔１６ｄのピッチ数が多くならない範囲で、通常螺合部１４の非常時係合部１６側端部に非常時係合雌ネジ孔１６ｄを数ピッチ分だけ形成してもよい）。さらに非常時係合部１６から生じた切削屑が切削屑排出溝３７によって第二タップネジ３５の後方へ排出されるので、これらの切削屑はナット１３から後方へ排出される。
さらに回転直線手段は、この後にナット１３を前方から見たときに反時計方向に回転させながらナット１３を前方へ移動させて、ナット１３全体を第二タップネジ３５から前方へ引き抜く。すると図２０に示すようにナット１３の完成品が得られる。 Subsequently, after the first tap screw 30 is removed from the holder, the second tap screw 35 shown in FIGS. 17 to 19 is supported by the holder in a fixed state, and the nut 13 is positioned coaxially immediately before the second tap screw 35. (See FIG. 17).
In this state, the rotating linear means moves the nut 13 straight forward while rotating the nut 13 clockwise when viewed from the front.
Then, the lead-in male screw portion 36A is loosely fitted in the normal screwing female screw hole 14b of the emergency engagement portion 16 (see FIG. 18), and the lead-in male screw portion 36A eventually becomes the normal screwing female screw hole of the normal screwing portion 14. 14b, and the emergency engagement female screw hole forming portion 36B cuts the normal threaded female screw hole 14b of the emergency engagement portion 16 to increase the depth and the front-rear width of the valley portion 14b-2. The thickness in the front-rear direction of the ridge portion 14b-1 is reduced. As shown in FIG. 19, when the front end position of the emergency engagement female screw hole forming portion 36B coincides with the front end position of the emergency engagement portion 16, the rotation linear means (regulation means) rotates and moves linearly. Stop. When the emergency engagement portion 16 is cut by the emergency engagement female screw hole forming portion 36B of the second tap screw 35 as described above, the entire inside of the emergency engagement portion 16 (normally screwed female screw holes 14b are formed. 16d (peak 16d-1, trough 16d-2) is formed in the emergency engagement female screw hole (in this portion) (at this time, the pitch of the normal screw female screw hole 14b in the normal screw 14) As long as the number of pitches of the emergency engagement female screw holes 16d does not increase more than the number, the emergency engagement female screw holes 16d are formed for several pitches at the end of the normal engagement portion 14 on the emergency engagement portion 16 side. May be). Further, since the cutting waste generated from the emergency engagement portion 16 is discharged to the rear of the second tap screw 35 by the cutting waste discharge groove 37, these cutting waste is discharged rearward from the nut 13.
Further, the rotation linear means moves the nut 13 forward while rotating the nut 13 counterclockwise when the nut 13 is viewed from the front, and pulls the entire nut 13 forward from the second tap screw 35. Then, a finished product of the nut 13 is obtained as shown in FIG.

以上説明した第二の実施形態でも通常螺合部１４と非常時係合部１６を一体化した上で通常螺合部１４と非常時係合部１６に跨る雌ネジ孔（通常螺合雌ネジ孔１４ｂ、非常時係合雌ネジ孔１６ｄ）を第一タップネジ３０及び第二タップネジ３５を利用して形成するので、通常螺合部１４に形成した通常螺合雌ネジ孔１４ｂ（の谷部１４ｂ−２）と非常時係合部１６に形成した非常時係合雌ネジ孔１６ｄ（の谷部１６ｄ−２）どうしを互いに精度よく連通（山部１４ｂ−１と山部１６ｄ−１を連続）させながら（両者の回転方向の位相を合わせながら）ナット１３を容易に製造できる。 In the second embodiment described above, the normal screwing portion 14 and the emergency engagement portion 16 are integrated, and then the female screw hole (normal screwing female screw) straddling the normal screwing portion 14 and the emergency engagement portion 16 is used. Since the hole 14b and the emergency engagement female screw hole 16d) are formed by using the first tap screw 30 and the second tap screw 35, the normal screwing female screw hole 14b (the valley part 14b) formed in the normal screwing part 14 is formed. -2) and the emergency engagement female screw holes 16d (the valley portions 16d-2) formed in the emergency engagement portion 16 are accurately communicated with each other (the crest portion 14b-1 and the crest portion 16d-1 are continuously connected). The nut 13 can be easily manufactured while adjusting the phase in the rotational direction of both.

続いて本発明の第三の実施形態について図２１−図２３を参照しながら説明する。なお第一の実施形態と同じ部材には同じ符号を付すに止めて、その詳細な説明は省略する。
本実施形態では非常時係合部１６’（第二螺合部）に対して非常時係合雌ネジ孔１６ｄより小径かつ通常螺合雌ネジ孔１４ｂと同径の中間径雌ネジ孔１６ｅを予め設けてあり（図２１参照）、この非常時係合部１６’とネジ溝を具備しない貫通孔が形成してある通常螺合部１４を一体化することによりナット１３を構成し、このナット１３に対して上記回転直線手段、ホルダ、第一タップネジ３０、及び第二タップネジ３５を用いて雌ネジ孔を加工する。通常螺合部１４の（ネジ溝を具備しない）上記貫通孔は中間径雌ネジ孔１６ｅより小径である。
まずはナット１３を第一タップネジ３０の直後に同軸状態で位置させる。そして非常時係合部１６の中間径雌ネジ孔１６ｅと第一タップネジ３０の通常螺合雌ネジ孔形成部３１の回転方向の位相を合わせた上で（中間径雌ネジ孔１６ｅが位置する仮想螺旋上に通常螺合雌ネジ孔形成部３１を位置させた上で）、第二の実施形態の第一タップネジ３０を用いた切削工程と同じ要領によって、通常螺合部１４の内部孔に対して通常螺合雌ネジ孔１４ｂを切削加工する。このとき第一タップネジ３０の通常螺合雌ネジ孔形成部３１が非常時係合部１６を貫通するが、非常時係合部１６に形成してある中間径雌ネジ孔１６ｅは通常螺合雌ネジ孔１４ｂと同径であるため、通常螺合雌ネジ孔形成部３１によって非常時係合部１６の内面が切削されることはない。
続いて、上記ホルダから第一タップネジ３０を取り外した後に、該ホルダによって第二タップネジ３５を固定状態で支持し、ナット１３を第二タップネジ３５の直前に同軸状態で位置させる。そして第二の実施形態の第二タップネジ３５を用いた切削工程と同じ要領によって、非常時係合部１６の中間径雌ネジ孔１６ｅに対して非常時係合雌ネジ孔１６ｄを切削加工する。
以上説明した第三の実施形態でも通常螺合部１４と非常時係合部１６を一体化した上で通常螺合部１４と非常時係合部１６に跨る雌ネジ孔（通常螺合雌ネジ孔１４ｂ、非常時係合雌ネジ孔１６ｄ）を第一タップネジ３０及び第二タップネジ３５を利用して形成するので、通常螺合部１４に形成した通常螺合雌ネジ孔１４ｂ（の谷部１４ｂ−２）と非常時係合部１６に形成した非常時係合雌ネジ孔１６ｄ（の谷部１６ｄ−２）どうしを互いに精度よく連通（山部１４ｂ−１と山部１６ｄ−１を連続）させながら（両者の回転方向の位相を合わせながら）ナット１３を容易に製造できる。 Next, a third embodiment of the present invention will be described with reference to FIGS. The same members as those in the first embodiment are designated by the same reference numerals, and detailed description thereof is omitted.
In the present embodiment, an intermediate diameter female screw hole 16e having a diameter smaller than that of the emergency engagement female screw hole 16d and the same diameter as that of the normal screw female screw hole 14b with respect to the emergency engagement portion 16 ′ (second screwing portion). A nut 13 is formed by integrating the emergency engagement portion 16 'and a normal threaded portion 14 formed with a through hole not provided with a thread groove, which are provided in advance (see FIG. 21). 13, the female screw hole is machined using the rotating linear means, the holder, the first tap screw 30 and the second tap screw 35. Usually, the through hole (not provided with a screw groove) of the screwing portion 14 has a smaller diameter than the intermediate female screw hole 16e.
First, the nut 13 is positioned coaxially immediately after the first tap screw 30. Then, after the phases in the rotational direction of the intermediate diameter female screw hole 16e of the emergency engagement portion 16 and the normal threaded female screw hole forming portion 31 of the first tap screw 30 are matched (the virtual diameter where the intermediate diameter female screw hole 16e is located) With the normal threaded female screw hole forming part 31 positioned on the spiral), the internal thread of the normal threaded part 14 is made in the same manner as the cutting process using the first tap screw 30 of the second embodiment. Thus, the normal threaded female screw hole 14b is cut. At this time, the normal threaded female screw hole forming portion 31 of the first tap screw 30 penetrates the emergency engagement portion 16, but the intermediate diameter female screw hole 16 e formed in the emergency engagement portion 16 is a normal threaded female. Since the diameter is the same as that of the screw hole 14b, the inner surface of the emergency engagement portion 16 is not cut by the normal threaded female screw hole forming portion 31.
Subsequently, after removing the first tap screw 30 from the holder, the second tap screw 35 is supported in a fixed state by the holder, and the nut 13 is positioned coaxially immediately before the second tap screw 35. Then, the emergency engagement female screw hole 16d is cut with respect to the intermediate diameter female screw hole 16e of the emergency engagement portion 16 in the same manner as the cutting process using the second tap screw 35 of the second embodiment.
In the third embodiment described above, the normal screwing portion 14 and the emergency engagement portion 16 are integrated, and then the female screw hole (normal screwing female screw) straddling the normal screwing portion 14 and the emergency engagement portion 16 is used. Since the hole 14b and the emergency engagement female screw hole 16d) are formed by using the first tap screw 30 and the second tap screw 35, the normal screwing female screw hole 14b (the valley part 14b) formed in the normal screwing part 14 is formed. -2) and the emergency engagement female screw holes 16d (the valley portions 16d-2) formed in the emergency engagement portion 16 are accurately communicated with each other (the crest portion 14b-1 and the crest portion 16d-1 are continuously connected). The nut 13 can be easily manufactured while adjusting the phase in the rotational direction of both.

以上、上記実施形態を用いて本発明を説明したが、本発明は様々な変更を施しながら実施可能である。
例えば第一の実施形態において第一タップネジ２０の小径ネジ孔形成部２１Ａの仕様を通常螺合雌ネジ孔１４ｂに対応する形状とし（その山部の外径を８．３ｍｍとする。即ち、この場合はこの小径ネジ孔形成部２１Ａが「第一ネジ孔形成部」に相当する）、第二タップネジ２５による切削工程を省略してもよい。また第三の実施形態において非常時係合部１６’に対して予め（通常螺合部１４と一体化する前に）非常時係合雌ネジ孔１６ｄを形成しておき、第二タップネジ３５による切削工程を省略してもよい。このようにすれば第一タップネジ２０、３０を用いた一回の切削工程によってナット１３に対して通常螺合雌ネジ孔１４ｂと非常時係合雌ネジ孔１６ｄを形成可能になる。
第一タップネジ２０、３０や第二タップネジ２５、３５を軸線まわりに回転させながら前後方向に移動させることにより、固定状態のナット１３に対して雌ネジ孔を加工してもよい。また第一タップネジ２０、３０及び第二タップネジ２５、３５とナット１３との一方を前後動を規制した状態で自身の軸線まわりに回転させ、他方を自身の軸線まわりの回転を規制しながら前後方向に直線移動させることにより、ナット１３に対して雌ネジ孔を加工してもよい。 As mentioned above, although this invention was demonstrated using the said embodiment, this invention can be implemented, giving various changes.
For example, in the first embodiment, the specification of the small diameter screw hole forming portion 21A of the first tap screw 20 is a shape corresponding to the normal threaded female screw hole 14b (the outer diameter of the crest is 8.3 mm. In this case, the small diameter screw hole forming portion 21A corresponds to the “first screw hole forming portion”), and the cutting step by the second tap screw 25 may be omitted. In the third embodiment, an emergency engagement female screw hole 16d is formed in advance (before being integrated with the normal screwing portion 14) in advance for the emergency engagement portion 16 ′, and the second tap screw 35 is used. The cutting process may be omitted. In this way, the normal threaded female screw hole 14b and the emergency engagement female screw hole 16d can be formed in the nut 13 by a single cutting process using the first tap screws 20 and 30.
By moving the first tap screws 20 and 30 and the second tap screws 25 and 35 in the front-rear direction while rotating around the axis, a female screw hole may be formed in the nut 13 in a fixed state. In addition, one of the first tap screws 20 and 30 and the second tap screws 25 and 35 and the nut 13 is rotated around its own axis while restricting forward and backward movement, and the other is controlled in the front and rear direction while restricting rotation around its own axis. A female screw hole may be formed in the nut 13 by linearly moving the nut 13.

通常螺合雌ネジ孔１４ｂは通常螺合部１４全体に形成する必要はなく、例えば通常螺合部１４の後端部（非常時係合部１６側の端部）に非常時係合雌ネジ孔１６ｄを形成し、通常螺合部１４の後端部より前方に位置する部分に通常螺合雌ネジ孔１４ｂを形成してもよい。
また通常螺合部１４に形成する通常螺合雌ネジ孔１４ｂと非常時係合部１６に形成する非常時係合雌ネジ孔１６ｄの仕様を上記実施形態とは異なる態様で変えても良い。例えば、通常螺合雌ネジ孔１４ｂと非常時係合雌ネジ孔１６ｄの内径は同一径であってもよい。ただし、この場合も非常時係合雌ネジ孔１６ｄの山部１６ｄ−１の肉厚（前後幅）を通常螺合雌ネジ孔１４ｂの山部１４ｂ−１の肉厚より小さくすることにより（谷部１６ｄ−２の前後幅を谷部１４ｂ−２の前後幅より大きくすることにより）、通常状態においてはリードスクリュー１１（雄ネジ１２）に対して通常螺合部１４の通常螺合雌ネジ孔１４ｂのみが螺合する（非常時係合雌ネジ孔１６ｄは螺合しない）ようにする必要がある。 The normal threaded female screw hole 14b does not need to be formed in the entire normal threaded portion 14. For example, an emergency engagement female screw is provided at the rear end portion (the end portion on the emergency engagement portion 16 side) of the normal threaded portion 14. You may form the hole 16d and may form the normal screwing female screw hole 14b in the part located ahead from the rear-end part of the normal screwing part 14. FIG.
In addition, the specifications of the normal threaded female screw hole 14b formed in the normal threaded portion 14 and the emergency engagement female screw hole 16d formed in the emergency engagement portion 16 may be changed in a manner different from the above embodiment. For example, the internal diameters of the normal threaded female screw hole 14b and the emergency engagement female screw hole 16d may be the same. However, in this case as well, the thickness (front-rear width) of the peak portion 16d-1 of the emergency engagement female screw hole 16d is made smaller than the thickness of the peak portion 14b-1 of the normal screwing female screw hole 14b (valley). In the normal state, the normal screwing female screw hole of the normal screwing part 14 with respect to the lead screw 11 (male screw 12) is made larger than the front and rear width of the valley part 14b-2). Only 14b needs to be screwed (the emergency engagement female screw hole 16d is not screwed).

通常螺合部１４と非常時係合部１６を上記とは別の材料によって成形してもよい。但し、非常時係合部１６を構成する材料は通常螺合部１４を構成する材料より硬質である必要があり、さらに通常螺合部１４と非常時係合部１６の構成材料は第一タップネジ２０、第二タップネジ２５、第一タップネジ３０、第二タップネジ３５の構成材料より軟質である必要がある。 Ordinarily, the screwing portion 14 and the emergency engagement portion 16 may be formed of a material different from the above. However, the material constituting the emergency engaging portion 16 needs to be harder than the material constituting the normal threaded portion 14, and the constituent material of the normal threaded portion 14 and the emergency engaging portion 16 is the first tap screw. 20, the second tap screw 25, the first tap screw 30, and the second tap screw 35 need to be softer than the constituent materials.

上記スライド部材に対してナット１３を回転規制した上で固定し、上記固定部材に対して前後動を規制したリードスクリュー１１を中心軸線１１ａ回りに回転させることにより、ナット１３（スライド部材）をリードスクリュー１１に対して進退させてもよい。また、ナット１３を固定部材に対して固定（回転も規制）した上で、ナット１３に螺合した（上記固定部材に対してスライド自在な）リードスクリュー１１をその軸線まわりに回転させることにより、リードスクリュー１１をナット１３に対して中心軸線１１ａ方向にスライドさせてもよい。さらにナット１３を固定部材に対して前後動を規制した上でナット１３を回転させることにより、上記固定部材に対してスライド自在かつ中心軸線１１ａ回りに回転規制されたリードスクリュー１１を中心軸線１１ａ方向に進退させてもよい。
リードスクリュー１１、ナット１３、各タップネジ２０、２５、３０、３５のネジのピッチや径は上記のものには限定されず、上記のものとは異なる大きさであってもよい。
各タップネジ２０、２５、３０、３５によって通常螺合部１４と非常時係合部１６に雌ネジ孔を切削加工する際の、各タップネジ２０、２５、３０、３５の通常螺合部１４や非常時係合部１６に対する挿入停止位置を機械的ストッパ（例えば、通常螺合部１４や非常時係合部１６の端面に当接することにより各タップネジ２０、２５、３０、３５の移動を規制する、各タップネジ２０、２５、３０、３５に設けたストッパ）により構成してもよい。 The nut 13 (sliding member) is lead-fixed by rotating the lead screw 11 with the nut 13 being restricted from rotating relative to the sliding member and rotating the lead screw 11 whose forward / backward movement is restricted relative to the fixing member around the central axis 11a. The screw 11 may be advanced or retracted. In addition, after fixing the nut 13 to the fixing member (rotation is also restricted), the lead screw 11 screwed into the nut 13 (slidable with respect to the fixing member) is rotated around its axis, The lead screw 11 may be slid with respect to the nut 13 in the direction of the central axis 11a. Further, the nut 13 is rotated with respect to the fixing member after the nut 13 is restricted to move back and forth, whereby the lead screw 11 that is slidable with respect to the fixing member and that is restricted from rotating about the central axis 11a is moved toward the central axis 11a. You may move forward and backward.
The pitch and diameter of the lead screw 11, the nut 13, and the tap screws 20, 25, 30, and 35 are not limited to those described above, and may be different from those described above.
When the female screw holes are cut in the normal threaded portion 14 and the emergency engagement portion 16 by the tap screws 20, 25, 30, 35, the normal threaded portion 14 and the emergency screw 14 of each tap screw 20, 25, 30, 35 The movement of each tap screw 20, 25, 30, 35 is regulated by bringing the insertion stop position with respect to the hour engagement portion 16 into contact with a mechanical stopper (for example, the normal screwing portion 14 or the end face of the emergency engagement portion 16, You may comprise by the stopper provided in each tap screw 20, 25, 30, 35.

第一螺合部１４の第一雌ネジ孔１４ｂの径を第二螺合部１６の第二雌ネジ孔１６ｄの径より大きくしたり（成形用雄ネジ部２１Ａの径を対応形状雄ネジ部２１Ｂの径より大きくしたり）、第一雌ネジ孔１４ｂの山部１４ｂ−１の前後幅を第二雌ネジ孔１６ｄの山部１６ｄ−１の前後幅より小さく（成形用雄ネジ部２１Ａの谷部２１Ａ−２の前後幅を対応形状雄ネジ部２１Ｂの谷部２１Ｂ−２の前後幅より小さく）してもよい。 The diameter of the first female threaded hole 14b of the first threaded part 14 is made larger than the diameter of the second female threaded hole 16d of the second threaded part 16 (the diameter of the molding male threaded part 21A is set to a correspondingly shaped male threaded part) 21B), the front-rear width of the crest 14b-1 of the first female screw hole 14b is smaller than the front-rear width of the crest 16d-1 of the second female screw hole 16d (of the male screw 21A for molding). The front and rear width of the valley portion 21A-2 may be smaller than the front and rear width of the valley portion 21B-2 of the corresponding shape male screw portion 21B.

１０送りネジ機構
１１リードスクリュー
１１ａ中心軸線
１２雄ネジ
１２−１山部
１２−２谷部
１３ナット
１４通常螺合部（第一螺合部）
１４ａウォームギヤ部
１４ｂ通常螺合雌ネジ孔（第一雌ネジ孔）
１４ｂ−１山部
１４ｂ−２谷部
１４ｃ接続孔
１４ｄ小径雌ネジ孔
１４ｅ傾斜雌ネジ孔
１６１６’ 非常時係合部（第二螺合部）
１６ａフランジ部
１６ｂ接続部
１６ｃ後方延長部
１６ｄ非常時係合雌ネジ孔（第二雌ネジ孔）
１６ｄ−１山部
１６ｄ−２谷部
１６ｅ中間径雌ネジ孔
１８ウォーム
２０第一タップネジ
２０Ａ小径部
２０Ｂ大径部
２０Ｃ傾斜部
２１雄ネジ
２１Ａ小径ネジ孔形成部（第一ネジ孔形成部）
２１Ｂ非常時係合雌ネジ孔形成部（第二ネジ孔形成部）
２１Ｃ傾斜ネジ孔形成部
２２切削屑排出溝
２５第二タップネジ
２５Ａ誘い込み部
２５Ｂ中間径部
２５Ｃ中間接続部
２６雄ネジ
２６Ａ誘い込み雄ネジ部
２６Ｂ通常螺合雌ネジ孔形成部（第一ネジ孔形成部）
２７切削屑排出溝
３０第一タップネジ
３１通常螺合雌ネジ孔形成部（第一ネジ孔形成部）
３２切削屑排出溝
３５第二タップネジ
３５Ａ誘い込み部
３５Ｂ大径部
３５Ｃ中間接続部
３６雄ネジ
３６Ａ誘い込み雄ネジ部
３６Ｂ非常時係合雌ネジ孔形成部（第二ネジ孔形成部）
３７切削屑排出溝
Ｌ１Ｌ２Ｌ３フランク面 DESCRIPTION OF SYMBOLS 10 Feed screw mechanism 11 Lead screw 11a Center axis line 12 Male screw 12-1 Mountain part 12-2 Valley part 13 Nut 14 Normal thread part (1st thread part)
14a Worm gear portion 14b Normal threaded female screw hole (first female screw hole)
14b-1 Mountain portion 14b-2 Valley portion 14c Connection hole 14d Small-diameter female screw hole 14e Inclined female screw hole 16 16 'Emergency engaging portion (second screwing portion)
16a Flange portion 16b Connection portion 16c Rear extension portion 16d Emergency engagement female screw hole (second female screw hole)
16d-1 Mountain portion 16d-2 Valley portion 16e Intermediate diameter female screw hole 18 Worm 20 First tap screw 20A Small diameter portion 20B Large diameter portion 20C Inclined portion 21 Male screw 21A Small diameter screw hole forming portion (first screw hole forming portion)
21B Emergency engagement female screw hole forming part (second screw hole forming part)
21C Inclined screw hole forming part 22 Cutting waste discharging groove 25 Second tap screw 25A Leading part 25B Intermediate diameter part 25C Intermediate connecting part 26 Male screw 26A Leading male screw part 26B Normal threaded female screw hole forming part (first screw hole forming part) )
27 Cutting waste discharging groove 30 First tap screw 31 Normal threaded female screw hole forming part (first screw hole forming part)
32 Cutting waste discharging groove 35 Second tap screw 35A Lead-in portion 35B Large diameter portion 35C Intermediate connection portion 36 Male screw 36A Lead-in male screw portion 36B Emergency engagement female screw hole forming portion (second screw hole forming portion)
37 Cutting waste discharge groove L1 L2 L3 Frank surface

Claims

A first threaded portion having a first female screw hole;
A second threaded portion having a second female threaded hole with different specifications and phase matching from the first female threaded hole;
In a method for producing a nut comprising:
An integration step of integrating the first screwing portion and the second screwing portion, and inserting and removing the first tap screw into and from the integrated first screwing portion and the second screwing portion. A female screw hole forming step for forming at least one of the first female screw hole and the second female screw hole,
A method for producing a nut, comprising:

In the manufacturing method of the nut of Claim 1,
A method for producing a nut in which the diameters of the valleys of the first female screw hole and the second female screw hole are different from each other.

In the manufacturing method of the nut of Claim 1 or 2,
The first tap screw has a first screw hole forming portion having a shape corresponding to the first female screw hole, and an axial position of the first tap screw is different from the first screw hole forming portion, and the second female screw hole And a second screw hole forming portion corresponding to the shape,
The female screw hole forming step inserts and detaches the first tap screw into and from the first screwed part and the second screwed part integrated with each other, thereby allowing the first screw hole forming part to A method of manufacturing a nut, the step of forming the first female screw hole in the screwing portion and forming the second female screw hole in the second screwing portion by the second screw hole forming portion.

In the manufacturing method of the nut of Claim 1 or 2,
The first tap screw having a second screw hole forming portion in which the axial position of the small diameter screw hole forming portion and the first tap screw is different from the small diameter screw hole forming portion and has a shape corresponding to the second female screw hole; ,
A second tap screw different from the first tap screw, having a first screw hole forming portion having a shape larger than the small diameter screw hole forming portion and corresponding to the first female screw hole,
With
The female screw hole forming step includes
By inserting and removing the first tap screw into and from the first screwed portion and the second screwed portion integrated with each other, the first female screw is inserted into the first screwed portion by the small diameter screw hole forming portion. A first forming step of forming a small-diameter female screw hole having a smaller diameter than the hole and forming the second female screw hole in the second threaded portion by the second screw hole forming portion;
By inserting the second tap screw into the small diameter female screw hole formed in the first threaded portion and expanding the small diameter female screw hole by the first screw hole forming portion, the first threaded engagement is achieved. A second forming step for forming the first female screw hole in the portion;
The manufacturing method of a nut provided with.

In the manufacturing method of the nut of Claim 1 or 2,
The first tap screw having a first screw hole forming portion having a shape corresponding to the first female screw hole,
A second tap screw different from the first tap screw, having a second screw hole forming portion having a shape corresponding to the second female screw hole and having a specification different from that of the first screw hole forming portion;
With
The female screw hole forming step includes
By inserting / removing the first tap screw into / from the first threaded part and the second threaded part integrated with each other, the first threaded part and the second threaded part are formed by the first screw hole forming part. A first forming step for forming the first female screw hole in the joint;
The second tap screw is inserted into and removed from the first female screw hole formed in the second screwing portion, and the specification of the first female screw hole of the second screwing portion is made by the second screw hole forming portion. A second forming step of forming the second female screw hole in the second threaded portion by changing,
The manufacturing method of a nut provided with.

In the manufacturing method of the nut of Claim 4 or 5,
A lead-in male screw portion (not shown) that engages with a female screw hole formed in at least one of the first screwed portion and the second screwed portion at a tip portion of the second tap screw without cutting the female screw hole ( 26A, 36A) A method for manufacturing a nut.

In the manufacturing method of the nut according to any one of claims 1 to 6,
A manufacturing method of a nut provided with a regulation means which regulates an insertion position to at least one of the first screw part and the second screw part of the first tap screw and the second tap screw at a predetermined position.