JPH03181649A - Ball screw - Google Patents
Ball screwInfo
- Publication number
- JPH03181649A JPH03181649A JP32052989A JP32052989A JPH03181649A JP H03181649 A JPH03181649 A JP H03181649A JP 32052989 A JP32052989 A JP 32052989A JP 32052989 A JP32052989 A JP 32052989A JP H03181649 A JPH03181649 A JP H03181649A
- Authority
- JP
- Japan
- Prior art keywords
- nut
- balls
- circulation
- screw
- piece
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000003068 static effect 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
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls
- F16H25/2214—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls with elements for guiding the circulating balls
- F16H25/2223—Cross over deflectors between adjacent thread turns, e.g. S-form deflectors connecting neighbouring threads
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
Description
【発明の詳細な説明】 〈産業上の利用分野〉 本発明は循環駒方式のボールねしに関する。[Detailed description of the invention] <Industrial application field> The present invention relates to a circulating piece type ball game.
〈従来の技術〉
ボールねしは、動・静ｗ１擦抵抗が小さく高い機械効率
をもち、精密送りや精密位置決めが可能であるため、工
作機械や産業機械の送り装置の要素部品として広く用い
られている。<Conventional technology> Ball screws have high mechanical efficiency with low dynamic and static w1 friction resistance, and are capable of precision feeding and positioning, so they are widely used as elemental components of feeding devices for machine tools and industrial machinery. ing.
ボールねじの循環方式として、リターンチューブ方式や
循環駒方式が知られている。循環駒方式のボールねじは
、最も低騒音であり高速送り用として用いて有利である
。The return tube method and the circulation piece method are known as circulation methods for ball screws. The circulating piece type ball screw has the lowest noise and is advantageous for use in high-speed feed applications.
第５図、第６図、第７図に基づいて循環駒方式のボール
ねじを説明する。A circulating piece type ball screw will be explained based on FIGS. 5, 6, and 7.
第５図にはボールねじの断面側面、第６図には第５図中
のＶＩ−Ｍ線矢視、第７図には循環腕の斜視を示しであ
る。FIG. 5 shows a cross-sectional side view of the ball screw, FIG. 6 shows a view taken along line VI-M in FIG. 5, and FIG. 7 shows a perspective view of the circulation arm.
ねじ軸１の外周にはねじ軸１側のねじＦ！４２が形成さ
れ、ナツト３の内周にはナツト３側のねじ溝４が形成さ
れている。ねじ溝２，４によって形成されるねじ状空間
５には多数のボール６が収容されている。ナッｈ３側の
隣接するねじ溝４間にはＳ字形の循環溝７（第７図参照
）を有する循環腕８が嵌合され、ボール６は循環腕８の
部位で循環溝７を通り、ねじ軸１の外径を乗り越えて元
のねじ溝４に戻るようになっている。循環線８は周方向
に複数（第６図参照、図示例では６個）嵌合され、ねじ
軸１とナツト３とのねじ状空間５に多数のボール６が収
容されるようになっている。循環線８はナツト３とは別
個に製作され、循環線８及びナツト３の腕穴の加工はＮ
Ｃ工作機械を用いて精密加工されている。そして、ナツ
ト３の腕穴に循環線８を嵌合することでナツト３が形成
される。The screw F on the screw shaft 1 side is on the outer periphery of the screw shaft 1! 42 is formed, and a thread groove 4 on the nut 3 side is formed on the inner periphery of the nut 3. A large number of balls 6 are accommodated in a thread-shaped space 5 formed by the thread grooves 2 and 4. A circulation arm 8 having an S-shaped circulation groove 7 (see Fig. 7) is fitted between the adjacent thread grooves 4 on the side of the nut 3, and the ball 6 passes through the circulation groove 7 at the circulation arm 8, and It is designed to go over the outer diameter of the shaft 1 and return to the original thread groove 4. A plurality of circulation wires 8 (see FIG. 6, six in the illustrated example) are fitted in the circumferential direction, so that a large number of balls 6 are accommodated in the threaded space 5 between the screw shaft 1 and the nut 3. . The circulation line 8 is manufactured separately from the nut 3, and the arm holes of the circulation line 8 and the nut 3 are processed by N.
Precision machined using C machine tools. The nut 3 is then formed by fitting the circulation wire 8 into the arm hole of the nut 3.
上記構成のボールねしでは、ねじ軸１とナツト３がボー
ル６を介して螺合した状態になっているので、ねじ軸１
を回転させることによりナツト３が軸方向に移動する。In the ball screw having the above configuration, the screw shaft 1 and the nut 3 are screwed together via the balls 6, so that the screw shaft 1
By rotating the nut 3, the nut 3 is moved in the axial direction.
上述したボールねしは、ボール６を循環線８によって内
部循環しているため、ナツト３の径を小さくすることが
でき、また、−暑気にボール６を循環させるようにして
いるので、−循環内のボール６の数が少なくねじｉｌ＄
２゜４とボール６並びにボール６同士の摩擦に起因する
回転性能の低下が少ないという利点がある。In the above-mentioned ball screw, since the balls 6 are internally circulated through the circulation line 8, the diameter of the nut 3 can be made small. The number of balls 6 inside is small and the screw il$
There is an advantage that there is little deterioration in rotational performance due to friction between the balls 6 and the balls 6 themselves.
〈発明が解決しようとする課題〉
近年、工作機械や産業機械の分野では、生産性向上等の
要望により機器の送りを高速化する必要が生じてきてお
り、ボールねじでの高速送り化が課題となっている。高
速送り用のボールねじにするためにはねじのリードを大
きくすれば良いが、ねじのリードを大きくした場合ナツ
ト３のねじ溝４を加工する際に、第８図に示すように工
具１１の柄１２とナツト３の干渉があるため、ナツト３
の長さに制約を受けてしまう。従って、リードを大きく
するとナツト３の長さを長くできず、循環するボール６
の数が減って負荷容量及び剛性が低下してしまう。<Problems to be solved by the invention> In recent years, in the field of machine tools and industrial machinery, there has been a need to increase the feeding speed of equipment due to demands for improved productivity, etc., and high-speed feeding with ball screws has become an issue. It becomes. In order to use a ball screw for high-speed feeding, it is sufficient to increase the lead of the screw, but when the lead of the screw is increased, when machining the thread groove 4 of the nut 3, as shown in Fig. 8, it is necessary to increase the lead of the screw. Due to interference between handle 12 and nut 3, nut 3
It is restricted by the length of. Therefore, if the lead is made larger, the length of the nut 3 cannot be increased, and the circulating balls 6
As a result, the load capacity and rigidity decrease.
く課題を解決するための手段〉
本発明のボールねしは、ねじ軸側のねじ溝とナツト側の
ねじ溝とで２条のねじ状空間を形成し、該２条のねじ状
仝間に多数のボールを収容すると共に、第１条目のねじ
状空間から第２条目のねじ状空間に前記ボールを循環さ
せる第１循環駒を前記ナツトに設け、第２条目のねじ状
空間から第１条目のねじ状空間に前記ボールを循環させ
る第２循環駒を前記第１循環駒と１８０度位相を変えて
前記ナツトに設けたことを特徴とする。Means for Solving the Problems> The ball screw of the present invention forms two thread-like spaces with a thread groove on the screw shaft side and a thread groove on the nut side, and has a thread-shaped space between the two threads. The nut is provided with a first circulation piece that accommodates a large number of balls and circulates the balls from the first threaded space to the second threaded space, and from the second threaded space to the first threaded space. A second circulation piece for circulating the balls through a screw-shaped space is provided on the nut with a phase difference of 180 degrees from the first circulation piece.
く作 用〉
第１循環駒で第１条目のねじ状空間から第２条目のねじ
状空間にボールを循環し、ねじ軸とナツトが相対的に１
８０度回転した時に第２循環駒で第２条目のねじ状空間
から第１条目のねじ状空間にボールが戻り、ボールは第
１循環駒と第２循環駒によって第１条目のねじ状空間と
第２条目のねじ状空間を周方向で半周ずつ循環し、２条
のボールねじが達成される。Action> The first circulating piece circulates the balls from the first threaded space to the second threaded space, and the screw shaft and nut are relatively 1
When the ball rotates 80 degrees, the second circulation piece returns the ball from the second threaded space to the first threaded space, and the first circulation piece and second circulation piece move the ball back to the first threaded space. A two-thread ball screw is achieved by circulating half a turn in the circumferential direction through the second threaded space.
く実 施 例〉
第１図には本発明の一実施例に係るボールねじの断面、
第２図には第１図中の■−■線矢視、第３図には循環線
の斜視を示しである。Embodiment FIG. 1 shows a cross section of a ball screw according to an embodiment of the present invention.
FIG. 2 shows a view taken along the line ■--■ in FIG. 1, and FIG. 3 shows a perspective view of the circulation line.
ねじ軸２１の外周には２条のねじ溝２２が形成されると
共に、ナツト２３の内周には２条のねじ溝２４が形成さ
れ、ねじ溝２２．２４によって２条のねじ状空間２５
ａ、 ２５ ｂが形成されろ。２条のねじ状空間２５ａ
、２５ｂには多数のボール２６が収容されている。Two thread grooves 22 are formed on the outer periphery of the screw shaft 21, and two thread grooves 24 are formed on the inner periphery of the nut 23.
a, 25 b are formed. Two threaded spaces 25a
, 25b accommodate a large number of balls 26.
第１条目のねじ溝２４と第２条目のねじ溝２４の間にお
けるナツト２３には、第３図に示す第１循環駒２７が嵌
合され、第１循環駒２７にはねじ溝２４間を連結する循
環軌道２８が形成されている。ねじ状空間２５のボール
２６は、第１循環駒２７の部位で循環軌道２８を通り、
ねじ軸２１の外径を乗り越えて第１条目のねじ状空間２
５ａから第２条目のねじ状空間２５ｂに循環するように
なっている。A first circulation piece 27 shown in FIG. 3 is fitted into the nut 23 between the first thread groove 24 and the second thread groove 24. A connecting circulation track 28 is formed. The ball 26 in the screw-shaped space 25 passes through the circulation track 28 at the first circulation piece 27,
The first threaded space 2 extends over the outer diameter of the threaded shaft 21.
5a to the second threaded space 25b.
第１循環駒２７と１８０度位相を変えた部位のナツト２
３には、第３図に示す第２循環駒２９が嵌合され、第２
循環駒２９にはねじ溝２４間を連結する循環軌道３０が
形成されている。ねじ状空間２５のボール２６は、第２
循環駒２９の部位で循環軌道３０を通り、ねじ軸２１の
外径を乗り越えて第２条目のねじ状空間２５ｂから第１
条目のねじ状空間２５ａに循環するようになっている。Nut 2 at the part that is 180 degrees out of phase with the first circulation piece 27
3 is fitted with the second circulation piece 29 shown in FIG.
A circulation track 30 connecting the thread grooves 24 is formed in the circulation piece 29. The ball 26 in the threaded space 25 is
Passing through the circulation track 30 at the circulation piece 29, passing over the outer diameter of the screw shaft 21, and from the second threaded space 25b to the first
It circulates in the threaded space 25a of the thread.
つまり、ボール２６は一対の第１循環駒２７と第２循環
駒２９によって第１条目のねじ状空間２５ａの半周と第
２条目のねじ状空間２５ｂの半周を循環するようになっ
ており、結果としてボール２６は、第１条目のねじ状空
間２５ａと第２条目のねじ状空間２５ｂとを１８０度ず
つ連結された軌道を循環されることになる。In other words, the ball 26 is circulated around half of the first threaded space 25a and half of the second threaded space 25b by the pair of first circulation pieces 27 and second circulation pieces 29. As a result, the ball 26 circulates in a trajectory that connects the first threaded space 25a and the second threaded space 25b by 180 degrees.
第１循環駒２７．第２循環駒２９の対はナツト２３の軸
方向に９０度ずつ位相をずらして４対嵌合されている。1st circulating piece 27. Four pairs of second circulation pieces 29 are fitted with each other 90 degrees out of phase in the axial direction of the nut 23.
そして、各対の第１循環駒２７ｍ、２７ｂ、２７ｃ、２
７ｄと第２＠環駒２９ ｇ、 ２９ ｂ、 ２９ ｃ、
２９ ｄとによって、ボール２６ａ、２６ｂ、２６ｃ
。Then, each pair of first circulation pieces 27m, 27b, 27c, 2
7d and 2nd @ ring piece 29 g, 29 b, 29 c,
29 d and balls 26a, 26b, 26c
.
２６ｄは、第１条目のねじ状空間２５ａの半周と第２条
目のねじ状空間２５ｂの半周をそれぞれ９０度ずつ位相
をずらして循環する。26d circulates around a half circumference of the first threaded space 25a and a half circumference of the second threaded space 25b, each with a phase shift of 90 degrees.
上記構成のボールねしは、ねじ軸２１とナツト２３がボ
ール２６を介して螺合した状態になっているので、ねじ
軸２１を回転させること１こよりナツト２３が移動する
。このボールねしは２条ねじとなっているので、ナツト
２３の移動を高速で行なうことができる。In the ball screw configured as described above, the screw shaft 21 and the nut 23 are screwed together via the balls 26, so that the nut 23 is moved by rotating the screw shaft 21. Since this ball screw is a double thread screw, the nut 23 can be moved at high speed.
上述したボールねしは、第１循環駒２７と第２循環駒２
９を位相を１８０度変えてナツト２３に嵌合したので、
ボール２６を第１条目のねじ状空間２５ａと第２条目の
ねじ状空間２５ｂの間で循環させることができ、２条ね
じのボールねじが達成され、１条のねじ溝２２．２４の
リードを大きくすることむく高速送りが可能になる。ま
た、第１循環駒２７と第２循環駒２９を１８０度位相を
変えて配置してボール２６の循環路を構成したので、ボ
ールねじの軸方向に対する循環路が占める幅が１条ねじ
に比べて半減し、同一のナツト２３に設けられる循環路
の数が倍増するととになる。乙のため、ボール２６の数
が倍増してボールねじの負荷容量及び剛性が倍増する。The above-mentioned ball rack has the first circulating piece 27 and the second circulating piece 2.
Since I changed the phase of 9 by 180 degrees and fitted it into nut 23,
The balls 26 can be circulated between the first threaded thread space 25a and the second threaded space 25b, and a ball screw with two threads is achieved, and the leads of the single thread groove 22 and 24 are achieved. Increasing the size allows for high-speed feeding. In addition, since the first circulation piece 27 and the second circulation piece 29 are arranged with a phase difference of 180 degrees to form a circulation path for the balls 26, the width occupied by the circulation path in the axial direction of the ball screw is smaller than that of a single thread screw. The number of circulation paths provided in the same nut 23 is doubled. Therefore, the number of balls 26 is doubled, and the load capacity and rigidity of the ball screw are doubled.
次に上記構成のボールねじにおける第１循環駒２７及び
第２循環駒２９の製作方法を第４図に基づいて説明する
。第４図には循環線を切り出している状態のナツト２３
の斜視を示しである。Next, a method of manufacturing the first circulation piece 27 and the second circulation piece 29 in the ball screw having the above structure will be explained based on FIG. 4. Figure 4 shows the nut 23 with the circulation line cut out.
This shows a perspective view.
ナツト２３の内周にねじ溝２４を形成した後、第１循環
駒２７及び第２循環駒２９とナツト２３との甚大３１を
加工する。甚大３１が垂直になるようにナツト２３をｍ
城に取付け、甚大３１にワイヤ３２を通して第１循環駒
２７及び第２循環駒２９を同時にワイヤカットにより切
り出す。切り出された第１循環駒２７及び第２循環駒２
９のねじ溝２４を基準として循環軌道２８．３０を追加
加工する。After forming the thread groove 24 on the inner periphery of the nut 23, the first circulation piece 27, the second circulation piece 29 and the nut 23 are machined to form a large diameter 31. Adjust the nut 23 so that the huge 31 is vertical.
It is attached to the castle, and the first circulation piece 27 and the second circulation piece 29 are simultaneously cut out by wire-cutting by passing the wire 32 through the wire 31. Cut out first circulation piece 27 and second circulation piece 2
Circulating orbits 28 and 30 are additionally machined based on the thread groove 24 of No. 9.
この時、ボール２６がねし溝２４から循環軌道２８，３
０側ζご案内される手段を設ける乙とでボール２６の循
環がスムーズに行なわれろようになる。循環軌道２８，
３０を加工した後、第１循環駒２７及び第２循環駒２９
を、各々切り出されたナツト２３の部位に嵌合する。At this time, the ball 26 moves from the screw groove 24 to the circulation orbits 28, 3.
By providing a means for guiding the ball 26 on the 0 side ζ, the circulation of the ball 26 can be carried out smoothly. circular orbit 28,
After processing 30, the first circulation piece 27 and the second circulation piece 29
are fitted into the respective cut out parts of the nut 23.
上述のように、ナツト２３から第１循環駒２７及び第２
循環駒２９を切り出し、ねじ溝２４を基準として循環軌
道２８．３０を加工し、再びナツト２３に嵌合すること
により、ねじ溝２４ （ボール２６の軌道）と循環軌道
２８．３０が正しく一致した第１循環駒２７及び第２循
環駒２９を製作することができる。As mentioned above, from the nut 23 to the first circulating piece 27 and the second
By cutting out the circulation piece 29, processing the circulation orbit 28.30 using the thread groove 24 as a reference, and fitting it into the nut 23 again, the thread groove 24 (orbit of the ball 26) and the circulation orbit 28.30 were correctly aligned. The first circulation piece 27 and the second circulation piece 29 can be manufactured.
このため、ボール２６が連続的に送られボール２６ ト
ネシ？１１２４及び循環軌道２８．３０並びにボール２
６同士の干渉がなくなる。For this reason, the ball 26 is continuously fed and the ball 26 is continuously fed. 1124 and circular track 28.30 and ball 2
There will be no interference between the 6.
〈発明の効果〉
本発明のボールねじは、第１循環駒と第２循環駒を位相
を１８０度変えてナツトに設けたので、第１条目のねじ
状空間と第２条目のねじ状空間の間でボールを循環させ
ることができ２条ねじのボールねじが達成される。この
ため、高速送りが可能になると共に、ボールの循環路が
増してボールの数を多くでき、ボールねじの負荷容量及
び剛性が高まる。<Effects of the Invention> In the ball screw of the present invention, the first circulation piece and the second circulation piece are provided in the nut with their phases changed by 180 degrees, so that the threaded space of the first thread and the threaded space of the second thread are The balls can be circulated between them, and a double threaded ball screw can be achieved. Therefore, high-speed feeding is possible, and the number of balls can be increased by increasing the number of circulation paths for the balls, thereby increasing the load capacity and rigidity of the ball screw.
第１図は本発明の一実施例に係るボールねじの断面図、
第２図は第１図中の■−■線矢視図、第３図１よ循環駒
の斜視図、第４図は循環駒を切り出している状態のナツ
トの斜視図、第５図は従来のボールねじの断面側面図、
第６図は第５図中のＷ−■締矢視図、第７図は循環駒の
斜視図、第８図はねじ溝を加工している状態の断面図で
ある。
図面中、
２１はねじ軸、
２２はねじ溝、
２３はナツト、
２４はねじ溝、
２５はねじ状空間、
２６はボール、
２７は第１循環駒、
２８は循環軌道、
２９は第２循環駒、
３０は循環軌道である。FIG. 1 is a sectional view of a ball screw according to an embodiment of the present invention;
Fig. 2 is a view taken along the line ■-■ in Fig. 1, Fig. 3 is a perspective view of the circulation piece shown in Fig. 1, Fig. 4 is a perspective view of the nut with the circulation piece cut out, and Fig. 5 is a conventional one. Cross-sectional side view of a ball screw,
6 is a view taken along the arrow W--■ in FIG. 5, FIG. 7 is a perspective view of the circulation piece, and FIG. 8 is a cross-sectional view of the thread groove being machined. In the drawing, 21 is a screw shaft, 22 is a screw groove, 23 is a nut, 24 is a screw groove, 25 is a screw-shaped space, 26 is a ball, 27 is a first circulation piece, 28 is a circulation orbit, and 29 is a second circulation piece. , 30 is a circular orbit.
Claims (1)
空間を形成し、該２条のねじ状空間に多数のボールを収
容すると共に、第１条目のねじ状空間から第２条目のね
じ状空間に前記ボールを循環させる第１循環駒を前記ナ
ットに設け、第２条目のねじ状空間から第１条目のねじ
状空間に前記ボールを循環させる第２循環駒を前記第１
循環駒と１８０度位相を変えて前記ナットに設けたこと
を特徴とするボールねじ。A thread groove on the screw shaft side and a thread groove on the nut side form two thread-like spaces, and a large number of balls are accommodated in the two thread-like spaces, and a number of balls are accommodated from the first thread space to the second thread space. A first circulation piece that circulates the ball through the threaded space in the thread is provided in the nut, and a second circulation piece that circulates the ball from the threaded space in the second thread to the threaded space in the first thread is provided in the nut.
A ball screw characterized in that the nut is provided with a phase change of 180 degrees from the circulation piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32052989A JPH03181649A (en) | 1989-12-12 | 1989-12-12 | Ball screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32052989A JPH03181649A (en) | 1989-12-12 | 1989-12-12 | Ball screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03181649A true JPH03181649A (en) | 1991-08-07 |
Family
ID=18122452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32052989A Pending JPH03181649A (en) | 1989-12-12 | 1989-12-12 | Ball screw |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03181649A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1524171A3 (en) * | 2003-10-14 | 2010-07-07 | Jtekt Corporation | Ball screw mechanism, machining method for joint between nut and ball circulation piece, and electric power steering device |
| CN107646083A (en) * | 2015-05-27 | 2018-01-30 | 舍弗勒技术股份两合公司 | Ball screw drive |
-
1989
- 1989-12-12 JP JP32052989A patent/JPH03181649A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1524171A3 (en) * | 2003-10-14 | 2010-07-07 | Jtekt Corporation | Ball screw mechanism, machining method for joint between nut and ball circulation piece, and electric power steering device |
| CN107646083A (en) * | 2015-05-27 | 2018-01-30 | 舍弗勒技术股份两合公司 | Ball screw drive |
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