JPH0736461Y2 - Spindle motor for machine tools - Google Patents
Spindle motor for machine toolsInfo
- Publication number
- JPH0736461Y2 JPH0736461Y2 JP5829689U JP5829689U JPH0736461Y2 JP H0736461 Y2 JPH0736461 Y2 JP H0736461Y2 JP 5829689 U JP5829689 U JP 5829689U JP 5829689 U JP5829689 U JP 5829689U JP H0736461 Y2 JPH0736461 Y2 JP H0736461Y2
- Authority
- JP
- Japan
- Prior art keywords
- spring
- preload
- rotary shaft
- load side
- side housing
- 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 - Fee Related
Links
Landscapes
- Motor Or Generator Frames (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Description
【考案の詳細な説明】 ［産業上の利用分野］ 本考案は自動工具交換装置を内蔵し、とくにプリント基
板などの薄いワークを加工する工作機用スピンドルモー
タにおいて、軸受の予圧を一定に保持するとともに、加
工中の異常負荷による回転軸の軸方向変位を小さくした
装置に関する。[Detailed Description of the Invention] [Industrial field of application] The present invention has a built-in automatic tool changer, and in a spindle motor for machine tools for machining thin workpieces such as printed circuit boards, maintains a constant preload of bearings. At the same time, it relates to a device in which the axial displacement of the rotary shaft due to an abnormal load during processing is reduced.
［従来の技術］ 自動工具交換装置をそなえたスピンドルモータは、第３
図に示すようにフレーム１に固定した負荷側ハウジング
３と回転軸５との間および前記フレーム１内に軸方向に
摺動しうるように設けた反負荷側ハウジング４と回転軸
５との間にそれぞれアンギュラ軸受７および８を挿入
し、前記反負荷側ハウジング４とフレームに固定したば
ね座13との間に予圧ばね11を設けてある。２は固定子鉄
心、６は回転子鉄心16は回転軸５に設けたストッパーで
微小な間隙を介して負荷側ハウジング３に対応させてあ
る。なお、17はコレット、18は工具たとえばドリル、19
はコレットを操作するドローバー、20はドローバーの戻
しばねである。[Prior Art] A spindle motor equipped with an automatic tool changer has a third
As shown in the figure, between the load-side housing 3 fixed to the frame 1 and the rotating shaft 5, and between the anti-load-side housing 4 and the rotating shaft 5 provided in the frame 1 so as to be slidable in the axial direction. Angular bearings 7 and 8 are inserted into the respective bearings, and a preload spring 11 is provided between the anti-load side housing 4 and a spring seat 13 fixed to the frame. Reference numeral 2 is a stator iron core, 6 is a rotor iron core 16, and a stopper provided on the rotary shaft 5 is made to correspond to the load side housing 3 through a minute gap. 17 is a collet, 18 is a tool such as a drill, 19
Is a drawbar for operating the collet, and 20 is a drawbar return spring.
アンギュラ軸受８を取り付けた反負荷側ハウジング４は
予圧ばね11で押圧してアンギュラ軸受に適当な予圧を加
えており、ドローバー19を図示しないピストンにより押
圧力Poで押圧してコレット17を開き、工具たとえばドリ
ル18を交換する。このとき、戻しばね20を介して回転軸
５が押され、予圧ばね11が圧縮されて予圧が強くなる
が、ストッパー16が負荷側ハウジング３に当たって回転
軸５の移動を阻止し、ドローバー19がコレット17を開く
ようにしている。The anti-load side housing 4 to which the angular bearing 8 is attached is pressed by a preload spring 11 to apply an appropriate preload to the angular bearing. The draw bar 19 is pressed by a piston (not shown) with a pressing force Po to open the collet 17, For example, replace drill 18. At this time, the rotary shaft 5 is pushed through the return spring 20 and the preload spring 11 is compressed to increase the preload. However, the stopper 16 hits the load side housing 3 to prevent the rotary shaft 5 from moving, and the draw bar 19 causes the collet 19. I'm trying to open 17.
［本考案が解決しようとする課題］ しかるに、工具交換はスピンドルモータの停止中に行わ
れるため、ストッパー16がハウジング３と接触しても差
し支えがないが、薄いワークの孔あけを行う場合の貫通
時などにドリルが送り方向の力を受け、加圧中に工具18
を介して回転軸５に予圧ばね11の予圧より大きい引っ張
り力Ｐが加わると、回転軸５のストッパー16がハウジン
グ３に当たって回転を阻止され、加工中に回転軸が急激
に制動されて加工精度が低下したり、危険をともなうな
どの欠点があった。[Problems to be solved by the present invention] However, since the tool change is performed while the spindle motor is stopped, there is no problem even if the stopper 16 comes into contact with the housing 3, but it is possible to penetrate the hole when drilling a thin work piece. When the drill receives a force in the feeding direction, the tool 18
When a pulling force P larger than the preload of the preload spring 11 is applied to the rotary shaft 5 via the, the stopper 16 of the rotary shaft 5 hits the housing 3 to prevent the rotation, and the rotary shaft is abruptly braked during the machining to improve the machining accuracy. There were drawbacks such as deterioration and risk.
［課題を解決するための手段］ このため、本考案は加工中における回転軸５の過負荷防
止を行い、軸方向変位を少なくするようにしたもので、
回転軸５との間にアンギュラ軸受７を介挿した負荷側ハ
ウジング３と、フレーム１の軸方向に摺動可能にし回転
軸５との間にアンギュラ軸受８を介挿した反負荷側ハウ
ジング４と、回転軸５に工具の交換時に負荷側ハウジン
グ３と接触するストッパー16を設け、反負荷側ハウジン
グ４の負荷側にフレームの軸方向に移動しフレーム段部
10に圧接させたばね受け９を設け、このばね受け９と反
負荷側ハウジング４との間に予圧ばね11と予圧ばねを所
定値に保持する予圧保持片12とを介挿し、前記ばね受け
９とフレーム１に固定したばね座13との間に加工中の回
転軸に加わる引っ張り力Ｐより強いばね15をそなえてお
り、このばね15によりハウジングの負荷側への移動を受
け止めるようにしてある。[Means for Solving the Problems] For this reason, the present invention is designed to prevent overload of the rotary shaft 5 during machining and reduce axial displacement.
A load-side housing 3 in which an angular bearing 7 is inserted between the rotary shaft 5 and an anti-load-side housing 4 in which an angular bearing 8 is inserted between the rotary shaft 5 and the rotary shaft 5 so as to be slidable in the axial direction. The rotary shaft 5 is provided with a stopper 16 that comes into contact with the load-side housing 3 when the tool is replaced, and is moved to the load side of the anti-load-side housing 4 in the axial direction of the frame so that the frame step portion
A spring bearing 9 pressed against 10 is provided, and a preload spring 11 and a preload holding piece 12 for holding the preload spring at a predetermined value are interposed between the spring bearing 9 and the anti-load side housing 4, and the spring bearing 9 and A spring 15 which is stronger than the tensile force P applied to the rotating shaft being processed is provided between the spring seat 13 fixed to the frame 1 and the spring 15 so as to receive the movement of the housing toward the load side.
［作用］ したがって、工具交換時はドローバーを押圧することに
より回転軸５のストッパー16が負荷側ハウジング３に当
たってドローバーの操作を行わせるが、加工中に回転軸
５を引っ張る力Ｐが加わった場合は、反負荷側ハウジン
グ４が予圧保持片12およびばね受け９を介して前記引っ
張り力Ｐより強いばね15で引っ張り方向の移動を阻止さ
れて回転軸５の軸方向変位を小さくし、ストッパー16に
よる回転部と固定部との接触を防ぐ。また、回転軸５が
軸方向に移動したときも予圧保持片12により予圧を所定
値に保持させる。[Operation] Therefore, when the tool is replaced, the stopper 16 of the rotary shaft 5 hits the load-side housing 3 to operate the drawbar by pressing the drawbar, but when the force P pulling the rotary shaft 5 is applied during processing, , The anti-load side housing 4 is prevented from moving in the pulling direction by the spring 15 stronger than the pulling force P via the preload holding piece 12 and the spring bearing 9 to reduce the axial displacement of the rotary shaft 5 and rotate by the stopper 16. Prevents contact between fixed part and fixed part. Further, even when the rotary shaft 5 moves in the axial direction, the preload holding piece 12 holds the preload at a predetermined value.
［実施例］ これを第１図の実施例について説明する。[Embodiment] This will be described with reference to the embodiment of FIG.
１は固定子鉄心２をそなえたフレーム、３はフレーム１
に固定した負荷側ハウジング、４はフレーム１内で軸方
向に摺動可能に支持させた反負荷側ハウジング、５は回
転子鉄心６を固着した回転軸、７は負荷側ハウジング３
と回転軸５との間に挿入したアンギュラ軸受、８は反負
荷側ハウジング４と回転軸５との間に挿入されたアンギ
ュラ軸受、９はフレーム１内に軸方向の摺動ができるよ
うに支持されたばね受けで、フレームの段部10に当たる
ようにしてある。11はこのばね受け９と反負荷側ハウジ
ング４との間に挿入した予圧ばね、12は反負荷側ハウジ
ング４とばね受け９の一方にねじ込みなどで突出量を調
節して設け他方に接触させた予圧保持片、13はフレーム
１内に止め環14で支持されたばね座で、ばね受け９との
間に強いばね15を介挿させている。16は回転軸５に設け
たストッパーで、負荷側ハウジング３の側面に微小空隙
ｇで対向させてある。17は回転軸端に設けたコレット、
18は工具たとえばドリル、19はコレットを操作するドロ
ーバー、20はドローバー19と回転軸５との間に挿入され
た戻しばねである。1 is a frame with a stator core 2 and 3 is a frame 1
A load-side housing fixed to the shaft 4, a counter-load-side housing 4 slidably supported in the frame 1 in the axial direction, a rotary shaft 5 to which a rotor core 6 is fixed, and a load-side housing 3
, An angular bearing inserted between the rotary shaft 5 and the rotary shaft 5, 8 is an angular bearing inserted between the anti-load side housing 4 and the rotary shaft 5, and 9 is supported in the frame 1 so as to be slidable in the axial direction. The spring bearing is adapted to hit the step 10 of the frame. Reference numeral 11 is a preload spring inserted between the spring bearing 9 and the counter load side housing 4, and 12 is provided in one of the counter load side housing 4 and the spring bearing 9 by adjusting the amount of protrusion by screwing or the like and brought into contact with the other. A preload holding piece 13 is a spring seat supported by a retaining ring 14 in the frame 1, and a strong spring 15 is inserted between the spring seat 9 and the spring bearing 9. Reference numeral 16 denotes a stopper provided on the rotary shaft 5, which faces the side surface of the load-side housing 3 with a minute gap g. 17 is a collet provided at the end of the rotating shaft,
Reference numeral 18 is a tool such as a drill, 19 is a draw bar for operating the collet, and 20 is a return spring inserted between the draw bar 19 and the rotary shaft 5.
工具18を交換する時は、従来と同様にドローバー19に図
示しないピストンで力Poを加えると、ドローバー19は戻
しばね20を押圧して回転軸５とともに右方に移動し、回
転軸５のストッパー16と負荷側ハウジング３とが接触す
ると回転軸５の移動が阻止され、ドローバー19のみが右
方へ移動してコレット17を開く。When the tool 18 is replaced, if a force Po is applied to the drawbar 19 by a piston (not shown) as in the conventional case, the drawbar 19 pushes the return spring 20 and moves rightward together with the rotary shaft 5, and the stopper of the rotary shaft 5 is stopped. When the load 16 and the load side housing 3 come into contact with each other, the rotation shaft 5 is prevented from moving, and only the draw bar 19 moves rightward to open the collet 17.
アンギュラ軸受には、反負荷側ハウジング４とばね受け
９との間に予圧保持片12があるため予圧ばね11が変化す
ることなく所定の予圧値が保持され、加工中に工具18を
介して回転軸５に引っ張り力Ｐが加わると、軸受に遊隙
があるためにアンギュラ軸受８を介して反負荷側ハウジ
ング４が引っ張られるが、この反負荷側ハウジング４の
移動は予圧保持片12とばね受け９を介して引っ張り力Ｐ
より強いばね15で緩衝されて僅かな軸方向変位しか生ぜ
ず、回転軸５のストッパー16が負荷側ハウジング３に当
たることはない。Since the angular bearing has the preload holding piece 12 between the anti-load side housing 4 and the spring bearing 9, the preload spring 11 maintains a predetermined preload value without changing and rotates through the tool 18 during machining. When a pulling force P is applied to the shaft 5, the anti-load side housing 4 is pulled via the angular bearing 8 due to the play in the bearing, but the movement of the anti-load side housing 4 is caused by the preload holding piece 12 and the spring bearing. Pulling force P through 9
The stopper 16 of the rotary shaft 5 does not hit the load-side housing 3 because it is buffered by the stronger spring 15 and produces only a slight axial displacement.
なお、予圧ばね11と予圧保持片12は、ハウジング４の周
方向にそれぞれ別個に複数個配置してもよく、第２図に
示すように、ばね受け９に螺合して先端を反負荷側ハウ
ジング４に当てたねじ体21で構成し、このねじ体21の内
孔に予圧ばね11を内蔵して押しねじ22で予圧値を調整さ
せることもできる。A plurality of preload springs 11 and preload holding pieces 12 may be separately arranged in the circumferential direction of the housing 4, and as shown in FIG. It is also possible to configure the screw body 21 applied to the housing 4 and to incorporate the preload spring 11 in the inner hole of the screw body 21 to adjust the preload value with the push screw 22.
［本考案の効果］ このように本考案は、回転軸端にコレット17を設けると
ともに回転軸内にコレットを操作するドローバー19をそ
なえた工具交換装置を内蔵した工作機用スピンドルモー
タにおいて、回転軸５にコレット17を操作する時にハウ
ジング３に当たるストッパー16を設け、回転軸５との間
にアンギュラ軸受を介挿しフレームの軸方向に摺動可能
に支持した反負荷側ハウジング４の負荷側に、予圧ばね
11と、フレームの軸方向に移動可能にしフレーム段部10
に圧接して前記予圧ばね11を受けるばね受け９と、この
ばね受け９とハウジング４の一方に取り付け他方に接触
して予圧を所定量に保持する予圧保持片12と、前記ばね
受け９とフレームに固着したばね座13との間に加工中の
回転軸に加わる引っ張り力Ｐより強いばね15をそなえて
あるから、加工中は常に一定の予圧を保持するととも
に、回転軸に工具による引っ張り力が加わった場合のよ
うに、異常な負荷に対しても回転軸の軸方向変位を小さ
くし、回転軸に設けた工具交換用のストッパーが固定部
に接触して回転軸に無理な制動をかけたり、ワークの損
傷をなくし、危険防止と加工製品の歩留まりを向上させ
るなどの効果が得られる。[Effects of the Invention] As described above, according to the invention, in the spindle motor for a machine tool, which is provided with the collet 17 at the end of the rotary shaft and the tool changer having the draw bar 19 for operating the collet in the rotary shaft, 5 is provided with a stopper 16 that abuts the housing 3 when operating the collet 17, and an angular bearing is inserted between the rotary shaft 5 and the anti-load side of the housing 4, which is slidably supported in the axial direction of the frame. Spring
11 and the frame step 10 that can move in the axial direction of the frame
A spring bearing 9 which is pressed against and receives the preload spring 11, a preload holding piece 12 which is attached to one of the spring bearing 9 and the housing 4 and holds the preload at a predetermined amount by contacting the other, the spring bearing 9 and the frame. Since a spring 15 stronger than the tensile force P applied to the rotating shaft being machined is provided between the spring seat 13 and the spring seat 13 fixed to the machine, a constant preload is always maintained during processing and the tensile force of the tool is applied to the rotating shaft. Even when an abnormal load is applied, the axial displacement of the rotary shaft is reduced, and the tool replacement stopper on the rotary shaft comes into contact with the fixed part to apply excessive braking to the rotary shaft. It is possible to obtain the effects of eliminating damage to the work, preventing danger and improving the yield of processed products.
第１図は本考案の実施例を示す上半部の側断面図、第２
図は他の実施例における一部を示す側断面図、第３図は
従来の例を示す側断面図である。 １はフレーム、３および４はハウジング、５は回転軸、
７および８はアンギュラ軸受、９はばね受け、10は段
部、11は予圧ばね、12は予圧保持片、13はばね座、15は
ばね、16はストッパー、17はコレット、18は工具、19は
ドローバーである。FIG. 1 is a side sectional view of an upper half portion showing an embodiment of the present invention, and FIG.
FIG. 3 is a side sectional view showing a part of another embodiment, and FIG. 3 is a side sectional view showing a conventional example. 1 is a frame, 3 and 4 are housings, 5 is a rotating shaft,
Reference numerals 7 and 8 are angular bearings, 9 is a spring bearing, 10 is a step portion, 11 is a preload spring, 12 is a preload holding piece, 13 is a spring seat, 15 is a spring, 16 is a stopper, 17 is a collet, 18 is a tool, 19 Is a drawbar.
Claims (2)
前記コレットを操作するドローバー19をそなえて工具交
換を行う工作機用スピンドルモータにおいて、負荷側ハ
ウジング３をフレームに固定し、反負荷側ハウジング４
をフレーム１の軸方向に摺動可能に保持して、それぞれ
回転軸５との間にアンギュラ軸受７、８を介挿し、 前記回転軸５に、コレット17の操作時に負荷側ハウジン
グ３と接触するストッパー16をそなえ、 前記反負荷側ハウジング４の負荷側に、フレーム内を軸
方向に移動しフレームの段部10に圧接させたばね受け９
と、このばね受け９と反負荷側ハウジング４との間に挿
入した予圧ばね11と、ばね受け９と反負荷側ハウジング
４の一方に取り付け他方に接触して予圧ばねを所定値に
保持する予圧保持片12、 および前記ばね受け９とフレーム１に固定したばね座13
との間に加工中の回転軸に加わる引っ張り力Ｐより強い
ばね15をそなえたことを特徴とする工作機用スピンドル
モータ。1. In a spindle motor for machine tools, wherein a collet 17 is provided at an end of a rotary shaft, and a drawbar 19 for operating the collet is provided in the rotary shaft to perform tool exchange. Load side housing 4
Are held slidably in the axial direction of the frame 1, and angular bearings 7 and 8 are respectively inserted between them and the rotary shaft 5, and the rotary shaft 5 comes into contact with the load side housing 3 when the collet 17 is operated. A spring bearing 9 which is provided with a stopper 16 and which is axially moved in the frame and brought into pressure contact with a step portion 10 of the frame on the load side of the housing 4 opposite to the load side.
And a preload spring 11 inserted between the spring bearing 9 and the anti-load side housing 4, and a preload for holding the preload spring at a predetermined value by being attached to one of the spring bearing 9 and the anti-load side housing 4 and contacting the other. Holding piece 12, and spring seat 13 fixed to the spring receiver 9 and the frame 1
A spindle motor for machine tools, characterized in that a spring 15 stronger than the tensile force P applied to the rotating shaft being machined is provided between and.
予圧ばね11を挿入してばね受け９に螺合し、前記先端を
反負荷側ハウジング４に接触させたねじ体である実用新
案登録請求の範囲第１項記載の工作機用スピンドルモー
タ。2. The preload holding piece 12 is a screw body in which a preload spring 11 is inserted into a hole opened at the tip and screwed into a spring bearing 9 to bring the tip into contact with the anti-load side housing 4. The spindle motor for machine tools according to claim 1 of the new model registration claim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5829689U JPH0736461Y2 (en) | 1989-05-20 | 1989-05-20 | Spindle motor for machine tools |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5829689U JPH0736461Y2 (en) | 1989-05-20 | 1989-05-20 | Spindle motor for machine tools |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH031655U JPH031655U (en) | 1991-01-09 |
| JPH0736461Y2 true JPH0736461Y2 (en) | 1995-08-16 |
Family
ID=31583775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5829689U Expired - Fee Related JPH0736461Y2 (en) | 1989-05-20 | 1989-05-20 | Spindle motor for machine tools |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0736461Y2 (en) |
-
1989
- 1989-05-20 JP JP5829689U patent/JPH0736461Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH031655U (en) | 1991-01-09 |
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