JPH0355703B2 - - Google Patents
Info
- Publication number
- JPH0355703B2 JPH0355703B2 JP60286480A JP28648085A JPH0355703B2 JP H0355703 B2 JPH0355703 B2 JP H0355703B2 JP 60286480 A JP60286480 A JP 60286480A JP 28648085 A JP28648085 A JP 28648085A JP H0355703 B2 JPH0355703 B2 JP H0355703B2
- Authority
- JP
- Japan
- Prior art keywords
- nut
- preload
- preload adjustment
- main nut
- main
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000036316 preload Effects 0.000 claims description 76
- 230000007246 mechanism Effects 0.000 claims description 12
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000010363 phase shift Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/2003—Screw mechanisms with arrangements for taking up backlash
- F16H25/2006—Screw mechanisms with arrangements for taking up backlash with more than one nut or with nuts consisting of more than one bearing part
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、精密ネジ送り機構に係り、特に送
り用親ネジに螺合される主ナツトおよび予圧調整
ナツトの円周上にすりわりを設けて、双方のナツ
トの軸方向の弾性作用により、バツクラツシユを
除去して位置決め精度を向上せしめた精密ネジ送
り機構に関する。[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a precision screw feeding mechanism, and in particular, a slot is provided on the circumference of a main nut and a preload adjustment nut that are screwed onto a feeding lead screw. The present invention relates to a precision screw feeding mechanism that eliminates backlash and improves positioning accuracy through the axial elastic action of both nuts.
一般に、ネジ対偶をマイクロメータなどの精密
測定機構あるいは工作機構の精密送り装置などに
用いるときは、加工精度のバラツキ等により有効
径およびピツチ誤差が生じ、ネジ山側面に生じる
隙間、すなわちバツクラツシユを生じることにな
る。したがつて、このバツクラツシユを除去する
必要がある。このバツクラツシユの除去方法とし
ては種々考えられており、ナツトによる親ネジの
軸方向への予圧（スラスト荷重）にる方法、ある
いは、ナツトによる親ネジの半径方向の抱き締め
力による方法等がある。
Generally, when a screw pair is used in a precision measuring mechanism such as a micrometer or a precision feeding device of a machining mechanism, an error in effective diameter and pitch occurs due to variations in processing accuracy, etc., and a gap occurs on the side surface of the thread, that is, backlash occurs. It turns out. Therefore, it is necessary to remove this backup. Various methods have been proposed to remove this backlash, including a method using a preload (thrust load) on the lead screw in the axial direction by a nut, and a method using a radial hugging force of the lead screw using a nut.
これらのバツクラツシユ除去方法の代表的なも
のを示すと次の通りである。 Typical methods of eliminating these defects are as follows.
第１１図に示すように、主ナツト１３にすり
わり１４を入れて小ネジ１５により、すりわり
１４を押し開いてロツクナツト１６で小ネジ１
５を固定すると、親ネジ１７には軸方向の引張
力が作用する。この結果ネジ山に予圧がかかり
主ナツト１３と親ネジ１７のバツクラツシユが
除去されることになる。 As shown in FIG. 11, insert the slot 14 into the main nut 13, push the slot 14 open with the machine screw 15, and tighten the machine screw 1 with the lock nut 16.
5 is fixed, an axial tensile force acts on the lead screw 17. As a result, a preload is applied to the screw thread, and the backlash between the main nut 13 and the lead screw 17 is removed.
また、第１２図に示すように、作動ネジを利
用したものは、親ネジ１８に対して主ナツト１
９と調整ナツト２０を二重に螺合させる。そし
て、調整ナツト２０に螺合する主ナツト１９の
リードを親ネジ１８のリードより大きくしてお
けば調整ナツト２０を一回転した際に、主ナツ
ト１９は軸方向に、主ナツト１９のリードから
親ネジ１８のリードをマイナスしたリード差だ
け移動することになる。この結果親ネジ１８に
は引張力が作用してバツクラツシユが除去され
る。なお、この方式では、バツクラツシユ調整
後はロツクナツト２１を締めて調整ナツト２０
の回り止めをしておく必要がある。 Further, as shown in FIG. 12, in the case of using an operating screw, the main nut
9 and the adjustment nut 20 are double screwed together. If the lead of the main nut 19 screwed into the adjustment nut 20 is made larger than the lead of the lead screw 18, when the adjustment nut 20 is rotated once, the main nut 19 will move in the axial direction from the lead of the main nut 19. It will move by the lead difference minus the lead of the lead screw 18. As a result, a tensile force is applied to the lead screw 18 and the backlash is removed. In addition, in this method, after adjusting the buckle lock, tighten the lock nut 21 and tighten the adjustment nut 20.
It is necessary to prevent rotation.
実公昭42−3366号に示すボールねじ装置は、
ナツトの一方の循環路と他方の循環路との間に
軸方向に直角な数個のスリ割りを設けて弾性部
を形成し、このナツトをナツト受けに嵌合し、
ナツト受けまたはナツトに螺合する調整環を設
け、この調整環の締付けによつてナツトに軸方
向の圧縮力または引張力を加え、微少変位させ
て、ボールねじのスキマまたは予圧を所要に調
整する構成としている。 The ball screw device shown in Utility Model Publication No. 42-3366 is
Several slits perpendicular to the axial direction are provided between one circulation path and the other circulation path of the nut to form an elastic part, and this nut is fitted into a nut receiver,
A nut receiver or an adjustment ring that is screwed onto the nut is provided, and by tightening this adjustment ring, compressive force or tensile force in the axial direction is applied to the nut, causing a slight displacement, and adjusting the gap or preload of the ball screw as required. It is structured as follows.
時開昭47−35461号に示すボールねじアセン
ブリに予荷重を与える装置は、送りねじに螺合
するナツトの中央部に肉薄に形成したベローズ
部と、一端側に形成した雄ねじ部と、他端側に
形成した前記雄ねじ部より径大に形成したスリ
ーブ部とを有し、前記ナツト雄ねじ部に螺合し
てスリーブ部を押圧する環ナツトを前記ナツト
に二重に螺合している。 The device for preloading a ball screw assembly shown in Jikai No. 47-35461 consists of a thin bellows part formed in the center of the nut that is screwed into the feed screw, a male thread part formed on one end, and a threaded part on the other end. The ring nut has a sleeve portion formed to have a larger diameter than the male threaded portion formed on the side, and a ring nut that is screwed onto the male threaded portion of the nut to press the sleeve portion is doubly screwed into the nut.
しかし、従来は以下に述べるような問題点を有
していた。
However, conventional methods have had the following problems.
(i) で示すものは、親ネジのネジ山に対して均
一な予圧（スラスト荷重）が作用せず、結果と
して主ナツトに偏摩耗が生じることになる。In the case shown in (i), a uniform preload (thrust load) is not applied to the thread of the lead screw, resulting in uneven wear on the main nut.
(ii) で示すものは、調整ナツトを締めすぎる
と、親ネジの送り操作がきつくなりロツク状態
が生じる。また、ゆる過ぎると、バツクラツシ
ユが生じるというように、親ネジのトルク調整
が非常に難しい。そして、ネジの摩耗等によ
り、予圧が変化した場合、早期に再調整の必要
が生じ煩雑である。In the case of (ii), if the adjustment nut is tightened too much, the feed operation of the lead screw becomes too tight and a locked condition occurs. Also, if it is too loose, it will cause a crash, making it extremely difficult to adjust the torque of the lead screw. If the preload changes due to wear of the screws or the like, readjustment is required at an early stage, which is complicated.
(iii) で示すものは予圧調整の際、調整環を螺合
調整して、ボルトによりこの調整環を固定する
必要があり、予圧調整が困難であつた。そし
て、摩耗による予圧調整をその郁度行う必要が
あつた。また、スリ割りをナツトに形成する
際、正確なバネ定数を有するように形成するこ
とが困難であつた。In the case of (iii), when adjusting the preload, it was necessary to thread the adjustment ring and fix the adjustment ring with a bolt, making it difficult to adjust the preload. Then, it was necessary to adjust the preload due to wear. Furthermore, when forming the slot on the nut, it was difficult to form the slot so that it had an accurate spring constant.
(iv) で示すものは、ナツトのスリーブ部端面
と、環ナツトの端面の直角度の精度が要求され
る。したがつて、送りねじとナツトの間に形成
されるバツクラツシユと、スリーブ部と環ナツ
トの端面の誤差により、軸とナツトの間で偏荷
重がかかり、噛合面に大きな力となりトルクを
増大させることになる。Item (iv) requires precision in the perpendicularity between the end face of the sleeve part of the nut and the end face of the ring nut. Therefore, an uneven load is applied between the shaft and the nut due to the back crush formed between the feed screw and the nut and the error in the end face of the sleeve part and the ring nut, resulting in a large force on the meshing surface and an increase in torque. become.
この発明は上記の問題点に鑑み創案されたもの
であり、簡易な構成でバツクラツシユを除去する
と共に、摩耗により予圧荷重が変化しても対応で
きる精密ネジ送り機構を提供することを課題とす
る。 This invention was devised in view of the above problems, and an object of the present invention is to provide a precision screw feeding mechanism that eliminates backlash with a simple configuration and can cope with changes in preload load due to wear.
この発明は、上記課題を解決するために、送り
用親ネジと螺合する主ナツトと、この主ナツトの
外周に二重に螺合する予圧調整ナツトとからな
り、前記主ナツトの中央部で円周方向に穿設した
複数のすりわりを有する精密ネジ送り機構におい
て、
前記主ナツトは、その一側に一体形成されたフ
ランジと、その他側外周に螺刻されたネジ部とを
有し、前記すりわりは、適宜間隔置きに穿設され
た複数個の予圧調整用の丸孔を有し、かつ円周方
向に相互に位相を適宜角度ずらして設けており、
前記予圧調整ナツトは、その一側内側に前記主
ナツトの外周ネジ部と螺合する雌ネジと、その略
中央部に円周方向に適宜長さで長手方向に適宜長
さ置きに設けた複数個のすりわりとを有し、これ
らすりわりは、適宜間隔おきに穿設した複数個の
予圧調整用の丸孔を有し、かつ円周方向に相互に
位相を適宜角度ずらして設けられており、
前記主ナツトに予圧調整ナツトが螺合して予圧
調整ナツトの他側が主ナツトのフランジを押圧す
ると共に、主ナツトと予圧調整ナツトに設けられ
たすりわりがそれぞれ反対方向に弾性変形し、主
ナツトの螺合位置で前記送り用親ネジをその軸線
の両端方向に引つ張りバツクラツシユを除去する
精密ネジ送り機構として構成した。
In order to solve the above-mentioned problems, this invention consists of a main nut that is threadedly engaged with a lead screw for feeding, and a preload adjustment nut that is doubly threaded on the outer periphery of this main nut, and a In a precision screw feeding mechanism having a plurality of slots drilled in the circumferential direction, the main nut has a flange integrally formed on one side thereof and a threaded portion threaded on the outer periphery of the other side, The slot has a plurality of round holes for preload adjustment drilled at appropriate intervals, and the slots are provided so that the phases are shifted from each other at an appropriate angle in the circumferential direction, and the preload adjustment nut It has a female screw threadedly engaged with the outer circumferential thread portion of the main nut on the inside of one side, and a plurality of slots provided approximately at the center thereof at appropriate lengths in the circumferential direction and at appropriate length intervals in the longitudinal direction. However, these slots have a plurality of round holes for preload adjustment drilled at appropriate intervals, and are provided with phases shifted by appropriate angles from each other in the circumferential direction, so that the preload is applied to the main nut. When the adjustment nut is screwed together, the other side of the preload adjustment nut presses the flange of the main nut, and the slots provided in the main nut and preload adjustment nut are elastically deformed in opposite directions, and the main nut is at the screwed position. The present invention is constructed as a precision screw feeding mechanism that pulls the feeding lead screw in the direction of both ends of its axis to remove backlash.
上記の手段により、この発明の精密ネジ送り機
構は、送り用親ネジに螺合している主ナツトに予
圧調整ナツトを螺合すると、予圧調整ナツトの他
側が主ナツトのフランジと当接し、さらにねじ込
むとフランジを押圧して、主ナツトのすりわり部
分には引張力が作用する。また、予圧調整ナツト
のすりわり部分には圧縮力が作用する。そして、
主ナツトと予圧調整ナツトに設けられたすりわり
がそれぞれ反対方向に弾性変形する相乗効果によ
り、送り用親ネジに螺合している主ナツトの位置
では送り用親ネジが軸線の両端方向に引つ張られ
ることになり、バツクラツシユが自動的に除去さ
れる。
By the above means, in the precision screw feeding mechanism of the present invention, when the preload adjustment nut is screwed onto the main nut screwed onto the feed lead screw, the other side of the preload adjustment nut comes into contact with the flange of the main nut; When screwed in, the flange is pressed and tensile force is applied to the slotted part of the main nut. In addition, compressive force acts on the slotted portion of the preload adjustment nut. and,
Due to the synergistic effect that the slots provided on the main nut and preload adjustment nut elastically deform in opposite directions, the feed lead screw is pulled toward both ends of the axis at the position of the main nut screwed into the feed lead screw. This will automatically remove the backlash.
また、主ナツトおよび予圧調整ナツトのすりわ
りがそれぞれ常に反対方向に弾性変形しているの
で、送り用親ネジのネジ山側面が摩耗してもバツ
クラツシユを自動的に除去して対応することが可
能である。 In addition, since the slots of the main nut and preload adjustment nut are always elastically deformed in opposite directions, it is possible to automatically remove buckling even if the threaded side of the feed lead screw is worn out. It is.
そして、主ナツトおよび予圧調整ナツトはすり
わりと丸孔を形成する際、丸孔の位置が正確に決
められ、その後、丸孔と丸孔を結ぶようにすりわ
りを形成するため、バネ定数を正確に特定するこ
とができる。 When the main nut and preload adjustment nut are slotted to form a round hole, the position of the round hole is determined accurately, and then the spring constant is adjusted to form the slot to connect the round holes. can be accurately identified.
以下この発明の実施例を図面に基づいて説明す
る。
Embodiments of the present invention will be described below based on the drawings.
第１図および第２図はこの発明の一実施例を示
す全体構成図である。図において、送り用親ネジ
（以下親ネジと記す）１には主ナツト２が螺合さ
れ、さらに該主ナツト２に予圧調整ナツト３が第
２図に示す如く二重に螺合されるようになつてお
り、双方のナツト２，３は弾性材を素材として形
成されている。 FIGS. 1 and 2 are overall configuration diagrams showing one embodiment of the present invention. In the figure, a main nut 2 is screwed onto a feed lead screw (hereinafter referred to as the lead screw) 1, and a preload adjustment nut 3 is doubly screwed onto the main nut 2 as shown in FIG. Both nuts 2 and 3 are made of an elastic material.
主ナツト２の一側方にはフランジ４がナツト本
体と一体に形成され、他側方外周にはネジ５が螺
刻されている。さらに内周の両端部には第３図の
如く適宜長さに亘つて雌ネジ２Ａ，２Ｂが設けら
れ、この雌ネジ２Ａおよび２Ｂ間の中央部は親ネ
ジ１と螺合しない空域部Ｃが形成されており、こ
の部分のみ肉厚の薄い円筒形に形成されている。
この円筒形に形成された略中央部には、適宜幅の
すりわり６Ａ，６Ｂが長手方向に適宜間隔Ｌを置
いて、本実施例では２本形成されており、その円
周方向の配列は、第４図および第５図の断面図に
示すように、双方のすりわりは、２箇所の残存部
７Ａ，７Ｂを残して円周方向に夫々対称形に２本
づつ形成されている。そして双方のすりわり６
Ａ，６Ｂは、円周方向に90度位相がずれて形成さ
れている。さらに、すりわり６Ａ，６Ｂ上には等
間隔に複数個の丸孔が穿設されている。すりわり
６Ａ，６Ｂの起点部に穿設された丸孔８Ａ，８Ｂ
は主ナツト２が長手方向に弾性変形した際の応力
集中をさけるためのもので、これ以外の丸孔９
Ａ，９Ｂはすりわり６Ａ，６Ｂ間の幅L1を変え
て後記する親ネジ１に与える予圧荷重の調整範囲
を広くすると共に、主ナツト２の軸方向の弾性変
形を柔軟にするためのものである。 A flange 4 is formed integrally with the nut body on one side of the main nut 2, and a screw 5 is threaded on the outer periphery of the other side. Furthermore, female screws 2A and 2B are provided at both ends of the inner periphery over an appropriate length as shown in FIG. Only this part is formed into a cylindrical shape with a thin wall.
In this embodiment, two slots 6A and 6B of an appropriate width are formed at an appropriate interval L in the longitudinal direction in the approximately central portion of this cylindrical shape, and the arrangement in the circumferential direction is As shown in the cross-sectional views of FIGS. 4 and 5, two slots are formed symmetrically in the circumferential direction, leaving two remaining portions 7A and 7B. And both sides 6
A and 6B are formed with a phase shift of 90 degrees in the circumferential direction. Furthermore, a plurality of round holes are bored at equal intervals on the slots 6A and 6B. Round holes 8A, 8B drilled at the starting points of slots 6A, 6B
is to avoid stress concentration when the main nut 2 is elastically deformed in the longitudinal direction, and other round holes 9
A and 9B are used to widen the adjustment range of the preload load applied to the lead screw 1 (described later) by changing the width L 1 between the slots 6A and 6B, and to make the elastic deformation of the main nut 2 more flexible in the axial direction. It is.
一方、主ナツト２に螺合される予圧調整ナツト
３は、第６図に示す如く、その外周の一側面に手
廻し操作を容易にするためのローレツト１０が刻
設され、また内周面の一側方には、前記主ナツト
２の外周に設けられたネジ５と螺合するための雌
ネジ１１が付設されている。そして、この予圧調
整ナツト３の他側３A1は、主ナツト２に螺合し
た際に、主ナツト２のフランジ４を押圧する。 On the other hand, as shown in FIG. 6, the preload adjusting nut 3 screwed onto the main nut 2 has a knurling 10 carved on one side of its outer periphery to facilitate manual turning, and a knurl 10 on one side of its outer periphery to facilitate manual rotation. A female thread 11 is provided on the side to engage with a thread 5 provided on the outer periphery of the main nut 2. The other side 3A1 of this preload adjusting nut 3 presses the flange 4 of the main nut 2 when it is screwed into the main nut 2.
また、前記主ナツト２に予圧調整ナツト３を螺
合した際、主ナツト２のフランジ側外周面２Ｃと
この予圧調整ナツト３の内周面３Ａとは適度のは
め合い公差をもつて密に嵌合されるようになつて
いる。 Furthermore, when the preload adjustment nut 3 is screwed onto the main nut 2, the flange side outer peripheral surface 2C of the main nut 2 and the inner peripheral surface 3A of the preload adjustment nut 3 are tightly fitted with an appropriate fitting tolerance. It is becoming more and more integrated.
ところで、予圧調整ナツト３の略中央部には前
記主ナツト２と同様に２本のすりわり１２Ａ，１
２Ｂが円周方向に設けられている。このすりわり
１２Ａ，１２Ｂにより予圧調整ナツト３は、主ナ
ツト２に螺合した際、長手方向に圧縮力が作用し
弾性変形するようになる。このすりわり１２Ａ，
１２Ｂの円周方向および長手方向に配列、位相は
前記主ナツト２に形成されているすりわり６Ａ，
６Ｂと同じであり、またすりわり１２Ａ，１２Ｂ
上に穿設した丸孔の目的も前記主ナツト２のもの
と同じであるので、ここでの詳細な説明は省略す
る。 By the way, the preload adjustment nut 3 has two slots 12A and 12A, 12A and 12A, similar to the main nut 2, approximately in the center thereof.
2B are provided in the circumferential direction. Due to these slots 12A and 12B, when the preload adjusting nut 3 is screwed into the main nut 2, a compressive force acts in the longitudinal direction and the preload adjusting nut 3 becomes elastically deformed. This slot 12A,
12B are arranged in the circumferential direction and longitudinal direction, and the phase is the slot 6A formed in the main nut 2,
Same as 6B, also slotted 12A, 12B
The purpose of the round hole bored on the top is also the same as that of the main nut 2, so detailed explanation will be omitted here.
なお、上記した主ナツト２と予圧調整ナツト３
に設けられるすりわり６Ａ，６Ｂ，１２Ａ，１２
Ｂと各丸孔８Ａ…等は、第１図、第２図および第
６図で示すように、始めにドリル等で正確な位置
に各丸孔８Ａ…等を穿設した後、丸穴と丸穴を結
ぶようにすりわりを形成すれば正確なバネ定数を
有する主ナツト２および予圧調整ナツト３を形成
することができる。 In addition, the main nut 2 and preload adjustment nut 3 mentioned above
Slots 6A, 6B, 12A, 12 provided in
As shown in Figures 1, 2, and 6, each round hole 8A, etc. is first drilled at the correct position with a drill, etc., and then the round hole 8A, etc. By forming slots to connect the round holes, it is possible to form the main nut 2 and preload adjustment nut 3 having accurate spring constants.
次に本実施例の作用を詳しく説明する。 Next, the operation of this embodiment will be explained in detail.
第７図に親ネジ１に対して主ナツト２および予
圧調整ナツト３を螺合した状態の断面図を示す。
図において、通常主ナツト２はフランジ４により
軸方向および円周方向に固定され、親ネジ１を回
すことにより主ナツト２は左右軸方向に移動する
ようになつている。 FIG. 7 shows a sectional view of the main nut 2 and preload adjustment nut 3 screwed together with the lead screw 1.
In the figure, the main nut 2 is normally fixed in the axial and circumferential directions by a flange 4, and by turning the lead screw 1, the main nut 2 is moved in the left-right axial direction.
予圧調整ナツト３を主ナツト２にネジ込むと、
主ナツト２のフランジ４とこの予圧調整ナツト３
の他側３A1とが当接する。さらにこの状態から
予圧調整ナツト３をネジ込むと、主ナツト２には
引張力が、また予圧調整ナツト３には圧縮力が
夫々作用するようになる。 When the preload adjustment nut 3 is screwed into the main nut 2,
Flange 4 of main nut 2 and this preload adjustment nut 3
The other side 3A1 comes into contact with the other side 3A1 . Further, when the preload adjusting nut 3 is screwed in from this state, a tensile force is applied to the main nut 2, and a compressive force is applied to the preload adjusting nut 3, respectively.
この結果、主ナツト２は、すりわり形成部を中
心に左右に弾性変形を起こすようになる。これに
伴い親ネジ１は主ナツト２との螺合部Ａ，Ｂ間に
おいて引張られるようになる。従つて螺合部Ａに
おいては第８図に示す如く、親ネジ１のネジ山１
Ａに対して矢印ａの如く右方向の予圧荷重が常時
作用し、主ナツト２は親ネジ１と間隔Ｓを保つて
右方に変位するようになる。 As a result, the main nut 2 is elastically deformed from side to side around the slotted portion. Accordingly, the lead screw 1 is pulled between the threaded portions A and B with the main nut 2. Therefore, in the threaded part A, as shown in FIG.
A preload load is constantly applied to A in the right direction as indicated by arrow a, and the main nut 2 is displaced to the right while maintaining the distance S from the lead screw 1.
一方、螺合部Ｂにおいては第９図に示すよう
に、ネジ山１Ａに対して矢印ｂの如く上記Ａ部と
反対方向の予圧荷重が作用するようになる。この
予圧荷重は予圧調整ナツト３の締め込み加減によ
つて調整される。 On the other hand, in the threaded portion B, as shown in FIG. 9, a preload load acts on the thread 1A in the opposite direction to the portion A, as indicated by arrow b. This preload load is adjusted by tightening the preload adjustment nut 3.
ところで、予圧調整ナツト３の締め込みにより
この予圧調整ナツト３には圧縮力と共に弾性復元
力が作用しており、この弾性復元力が常時主ナツ
ト２を介して親ネジ１にも作用しているのでネジ
の摩耗等により親ネジ１と主ナツト２間にバツク
ラツシユが増加してもこれを補償することができ
る。従つて従来技術のように早期に再調整する必
要はない。 By the way, when the preload adjustment nut 3 is tightened, an elastic restoring force acts on the preload adjustment nut 3 along with a compressive force, and this elastic restoring force always acts on the lead screw 1 via the main nut 2. Therefore, even if backlash increases between the lead screw 1 and the main nut 2 due to thread wear, etc., this can be compensated for. Therefore, there is no need for early readjustment as in the prior art.
本実施例の場合、主ナツト２を軸方向の左右い
ずれの方向に移動させた場合でも、バツクラツシ
ユは除去できる。すなわち、第８図および第９図
に示す如く主ナツト２を右方向に送つた場合、螺
合部Ａにおいてバツクラツシユが除去され、反対
に左方向に送つた場合には螺合部Ｂにおいてバツ
クラツシユが除去されるようになる。 In the case of this embodiment, the backlash can be removed regardless of whether the main nut 2 is moved in the left or right direction in the axial direction. That is, when the main nut 2 is fed rightward as shown in FIGS. 8 and 9, the buckle is removed at the threaded part A, and on the other hand, when the main nut 2 is fed leftward, the buckle is removed at the threaded part B. will be removed.
また、本実施例以外の他の実施例として主ナツ
ト２および予圧調整ナツト３を第１０図の如き構
造とすれば、主ナツト２には圧縮力が、予圧調整
ナツト３には引張力が夫々作用して親ネジ１には
前述とは反対の圧縮力が作用し、ネジ山１Ａを外
側から予圧することになるが、勿論この方法でも
構わない。 Furthermore, if the main nut 2 and the preload adjusting nut 3 have a structure as shown in FIG. As a result, a compressive force opposite to that described above acts on the lead screw 1, and the thread 1A is preloaded from the outside, but of course, this method may also be used.
ところで、主ナツト２および予圧調整ナツト３
に形成されたすりわりの位相は、本実施例では円
周方向に90度ずれて配列しているが、この位相の
ずれは120度であつても良い。また、すりわりの
数が複数に増えた場合でもその位相は90度または
120度ずつ相互にずれて形成することが望ましい。
この位相のずれにより、親ネジ１のネジ山には全
体に均一な予圧が作用する。 By the way, the main nut 2 and the preload adjustment nut 3
In this embodiment, the phases of the slots formed in the grooves are arranged with a 90 degree shift in the circumferential direction, but the phase shift may be 120 degrees. Also, even if the number of slots increases, the phase will be 90 degrees or
It is desirable to form them mutually offset by 120 degrees.
Due to this phase shift, a uniform preload acts on the entire thread of the lead screw 1.
また、第７図に示す如く主ナツト２および予圧
調整ナツト３のすりわり形成部の肉厚t1，t2およ
び双方のすりわり間の幅Ｌを任意に設定すること
により主ナツト２および予圧調整ナツト３のバネ
定数を変えることができる。すなわち、親ネジ１
に小さいトルク荷重が作用する場合は、小さい予
圧荷重でよいので肉厚t1，t2およびすりわり間の
幅Ｌも小さくてよい。反対に親ネジ１が大きいト
ルク荷重を受ける場合は、肉厚t1，t2およびすり
わり間の幅Ｌを大きくして剛性を高め大きな予圧
荷重を与えておく必要がある。 Furthermore, as shown in FIG. 7, by arbitrarily setting the wall thicknesses t 1 and t 2 of the slot forming portions of the main nut 2 and the preload adjustment nut 3 and the width L between the slots, the main nut 2 and the preload adjustment nut 3 can be adjusted as desired. The spring constant of the adjustment nut 3 can be changed. That is, lead screw 1
When a small torque load is applied to the groove, a small preload load is sufficient, so the wall thicknesses t 1 and t 2 and the width L between the slots may also be small. On the other hand, if the lead screw 1 is to receive a large torque load, it is necessary to increase the wall thicknesses t 1 and t 2 and the width L between the slots to increase the rigidity and apply a large preload.
なお、本発明は上記実施例に限定されるもので
はなく、例えば予圧調整の範囲が広いので微動送
り機構にも応用することができる等、この発明の
要旨を逸脱しない範囲において種々の変更を加え
得ることができるのは勿論である。 It should be noted that the present invention is not limited to the above-mentioned embodiments, and various modifications may be made without departing from the gist of the present invention, for example, the range of preload adjustment is wide, so it can be applied to fine-movement feed mechanisms. Of course you can get it.
以上の説明によつて明らかな如く、本発明によ
れば次のような効果がある。
As is clear from the above description, the present invention has the following effects.
(1) 主ナツトと予圧調整ナツトに設けられたすり
わりがそれぞれ反対方向に弾性変形する相乗効
果により、送り用親ネジに螺合している主ナツ
トの位置で送り用親ネジが軸線の両端方向に引
つ張られてバツクラツシユが自動的に除去され
る。したがつて、予圧の調整範囲が広く、しか
も簡単に予圧の調整ができ、親ネジを回転させ
るトルクの調整も細かくでき位置決め精度が向
上する。(1) Due to the synergistic effect that the slots provided on the main nut and the preload adjustment nut elastically deform in opposite directions, the feed lead screw is at both ends of the axis at the position of the main nut screwed into the feed lead screw. direction and the backlash is automatically removed. Therefore, the preload adjustment range is wide, the preload can be easily adjusted, and the torque for rotating the lead screw can be finely adjusted, improving positioning accuracy.
(2) また、主ナツトおよび予圧調整ナツトのすり
わりがそれぞれ反対方向に弾性変形するため送
り用親ネジのネジ山側面が摩耗しても自動的に
これを補償するので、その都度再調整する必要
がない。(2) Also, since the slots of the main nut and preload adjustment nut are elastically deformed in opposite directions, even if the threaded side of the lead screw for feed wears out, this is automatically compensated for, so readjust it each time. There's no need.
(3) 主ナツトおよび予圧調整ナツトに形成される
丸孔は、その穿設位置を正確に決めることがで
き、その後、丸孔と丸孔を結ぶようにすりわり
を形成するため、バネ定数が正確に特定でき、
送り用親ネジに対し適切な送りのできる主ナツ
トおよび予圧調整ナツトを形成することができ
る。(3) The positions of the round holes formed in the main nut and preload adjustment nut can be determined accurately, and then the slots are formed to connect the round holes, so the spring constant is can be accurately identified,
It is possible to form a main nut and a preload adjustment nut that can feed the lead screw appropriately.
第１図は本発明の精密ネジ送り機構の全体構成
図、第２図は主ナツトと予圧調整ナツトとの螺合
状態の平面図、第３図は主ナツトの半断面図、第
４図は第３面におけるＸ−Ｘ線断面図、第５図は
第３図におけるＹ−Ｙ線断面図、第６図は予圧調
整ナツトの半断面図、第７図は第２図の縦断面
図、第８図は第７図におけるＡ部拡大図、第９図
は第７図におけるＢ部拡大図、第１０図は他の実
施例を示す縦断面図、第１１図および第１２図は
従来例を示した図である。
１……親ネジ、２……主ナツト、３……予圧調
整ナツト、４……フランジ、３A1……他側、２
Ａ，２Ｂ，１１……雌ネジ、６Ａ，６Ｂ，１２
Ａ，１２Ｂ……すりわり、８Ａ，８Ｂ，９Ａ，９
Ｂ……丸孔。
Fig. 1 is an overall configuration diagram of the precision screw feeding mechanism of the present invention, Fig. 2 is a plan view of the screwed state of the main nut and preload adjustment nut, Fig. 3 is a half sectional view of the main nut, and Fig. 4 is 5 is a sectional view taken along the Y-Y line in FIG. 3, FIG. 6 is a half sectional view of the preload adjustment nut, FIG. 7 is a vertical sectional view of FIG. 2, Fig. 8 is an enlarged view of part A in Fig. 7, Fig. 9 is an enlarged view of part B in Fig. 7, Fig. 10 is a vertical sectional view showing another embodiment, and Figs. 11 and 12 are conventional examples. FIG. 1...Lead screw, 2...Main nut, 3...Preload adjustment nut, 4...Flange, 3A 1 ...Other side, 2
A, 2B, 11...Female thread, 6A, 6B, 12
A, 12B...Suriwari, 8A, 8B, 9A, 9
B...Round hole.
Claims (1)
ナツトの外周に二重に螺合する予圧調整ナツトと
からなり、前記主ナツトの中央部で円周方向に穿
設した複数のすりわりを有する精密ネジ送り機構
において、 前記主ナツトは、その一側に一体形成されたフ
ランジと、その他側外周に螺刻されたネジ部とを
有し、前記すりわりは、適宜間隔置きに穿設され
た複数個の予圧調整用の丸孔を有し、かつ円周方
向に相互に位相を適宜角度ずらして設けており、 前記予圧調整ナツトは、その一側内側に前記主
ナツトの外周ネジ部と螺合する雌ネジと、その略
中央部に円周方向に適宜長さで長手方向に適宜長
さ置きに設けた複数個のすりわりとを有し、これ
らすりわりは、適宜間隔おきに穿設した複数個の
予圧調整用の丸孔を有し、かつ円周方向に相互に
位相を適宜角度ずらして設けられており、 前記主ナツトに予圧調整ナツトが螺合して予圧
調整ナツトの他側が主ナツトのフランジを押圧す
ると共に、主ナツトと予圧調整ナツトに設けられ
たすりわりがそれぞれ反対方向に弾性変形し、主
ナツトの螺合位置で前記送り用親ネジをその軸線
の両端方向に引つ張りバツクラツシユを除去する
ことを特徴とする精密ネジ送り機構。[Scope of Claims] 1. Consisting of a main nut that is screwed into the feed lead screw, and a preload adjustment nut that is double screwed onto the outer periphery of the main nut, the main nut is bored circumferentially in the center of the main nut. In a precision screw feeding mechanism having a plurality of slots, the main nut has a flange integrally formed on one side thereof and a threaded portion formed on the outer periphery of the other side, and the slots include: The preload adjustment nut has a plurality of round holes for preload adjustment drilled at appropriate intervals, and the preload adjustment nut has a plurality of round holes for adjusting the preload, which are provided at appropriate angles in phase with respect to each other in the circumferential direction, and the preload adjustment nut has a plurality of round holes for preload adjustment drilled at appropriate intervals, and the preload adjustment nut has a plurality of round holes for adjusting the preload, which are bored at appropriate intervals, and are provided at appropriate angles in phase with respect to each other in the circumferential direction. It has a female thread that is screwed into the outer peripheral thread of the main nut, and a plurality of slots provided approximately at the center of the thread at appropriate lengths in the circumferential direction and at appropriate length intervals in the longitudinal direction. has a plurality of round holes for preload adjustment drilled at appropriate intervals, and the preload adjustment nuts are provided with appropriate angles shifted from each other in phase in the circumferential direction, and the preload adjustment nut is screwed into the main nut. Then, the other side of the preload adjustment nut presses the flange of the main nut, and the slots provided in the main nut and preload adjustment nut are elastically deformed in opposite directions, and the feed lead screw closes at the screwing position of the main nut. A precision screw feeding mechanism characterized by removing the crushing caused by pulling the screw in the direction of both ends of its axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28648085A JPS62147161A (en) | 1985-12-19 | 1985-12-19 | Precision screw feed mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28648085A JPS62147161A (en) | 1985-12-19 | 1985-12-19 | Precision screw feed mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62147161A JPS62147161A (en) | 1987-07-01 |
| JPH0355703B2 true JPH0355703B2 (en) | 1991-08-26 |
Family
ID=17704937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28648085A Granted JPS62147161A (en) | 1985-12-19 | 1985-12-19 | Precision screw feed mechanism |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62147161A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5644951A (en) * | 1991-11-15 | 1997-07-08 | Hatamura; Yotaro | Feed screw apparatus and precise positioning and fine feed system |
| DE4142099C2 (en) * | 1991-12-19 | 1994-01-13 | Evangelos Retzios | Bush-like drive element |
| JP2019172002A (en) * | 2018-03-28 | 2019-10-10 | 富士機工株式会社 | Steering column device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS423366Y1 (en) * | 1964-11-25 | 1967-02-28 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5923892Y2 (en) * | 1980-05-19 | 1984-07-16 | 三菱電機株式会社 | Motion direction changing device |
-
1985
- 1985-12-19 JP JP28648085A patent/JPS62147161A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS423366Y1 (en) * | 1964-11-25 | 1967-02-28 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62147161A (en) | 1987-07-01 |
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