JP4636824B2 - Rotating shaft device - Google Patents

Rotating shaft device Download PDF

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JP4636824B2
JP4636824B2 JP2004207266A JP2004207266A JP4636824B2 JP 4636824 B2 JP4636824 B2 JP 4636824B2 JP 2004207266 A JP2004207266 A JP 2004207266A JP 2004207266 A JP2004207266 A JP 2004207266A JP 4636824 B2 JP4636824 B2 JP 4636824B2
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spiral groove
housing
coolant
peripheral surface
stator
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JP2006026774A (en
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郷 平野
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Makino Milling Machine Co Ltd
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Description

本発明は、工作機械の主軸装置又は回転テーブル装置などを含むモータ内蔵式の回転軸装置に関し、特に内蔵されたモータの冷却構造を備えた回転軸装置に関する。   The present invention relates to a rotary shaft device incorporating a motor including a spindle device or a rotary table device of a machine tool, and more particularly to a rotary shaft device having a built-in motor cooling structure.

工作機械の主軸装置で、モータが内蔵された主軸装置のビルトインモータを冷却する構造が特許文献１に開示されている。この主軸装置は、ビルトインモータのステータが装着されているハウジングの内周面に螺旋溝を形成し、その螺旋溝に冷却液を流してステータ及びハウジングを冷却する構造を備えたものである。
また、工作機械の回転テーブル装置で、モータが内蔵された回転テーブル装置のケーシングを冷却する構造が特許文献２に記載されている。この回転テーブル装置は、ビルトインモータのステータが装着されているケーシング２の外周面にジャケット溝２０が形成され、冷却液を循環供給する構造を備えたものである。 Patent Document 1 discloses a structure for cooling a built-in motor of a spindle device in which a motor is built in a spindle device of a machine tool. This spindle device has a structure in which a spiral groove is formed on an inner peripheral surface of a housing on which a stator of a built-in motor is mounted, and a cooling liquid is supplied to the spiral groove to cool the stator and the housing.
Further, Patent Document 2 describes a structure for cooling a casing of a rotary table device having a built-in motor in a rotary table device of a machine tool. This rotary table device has a structure in which a jacket groove 20 is formed on the outer peripheral surface of a casing 2 on which a stator of a built-in motor is mounted, and a coolant is circulated and supplied.

特公平８−１０９７５号公報Japanese Patent Publication No. 8-10975 特開平４−２８９０４２号公報JP-A-4-289042

前述の特許文献１及び特許文献２に記載のビルトインモータの冷却構造は、冷却液を流す螺旋溝が一重であるので、冷却液が一方通行に流れ、冷却液入口付近のハウジングの温度が低く、冷却液出口付近のハウジングの温度が高くなる。この温度差によるハウジングの熱変形が発生し、装置の精度に悪影響を及ぼすという問題点があった。
本発明は、この問題点を解決するためになされたものであり、本発明の目的は、冷却液を流通する螺旋溝を二重にして、冷却液を往路、復路として往復に流して、ステータ及びハウジングを冷却することにより、ハウジング各部の温度差を少なくして、熱変形が小さい精度の良い回転軸装置を提供することである。 In the built-in motor cooling structure described in Patent Document 1 and Patent Document 2 described above, since the spiral groove for flowing the coolant is single, the coolant flows in one way, and the temperature of the housing near the coolant inlet is low, The temperature of the housing near the coolant outlet becomes high. There is a problem in that the housing is thermally deformed due to this temperature difference, which adversely affects the accuracy of the apparatus.
The present invention has been made to solve this problem, and an object of the present invention is to double the spiral groove through which the coolant flows, and to flow the coolant back and forth as a forward path and a return path, thereby And cooling the housing reduces the temperature difference of each part of the housing, and provides an accurate rotating shaft device with small thermal deformation.

前述の目的を達成するために、本発明によれば、モータが内蔵された回転軸装置であって、枠体であるハウジングと、前記ハウジングに回転可能に支承された回転軸と、前記ハウジングに取付けられたステータと前記回転軸に取付けられたロータとからなるモータと、前記ステータと前記ハウジングとの間に嵌着された円筒状のスリーブと、を具備し、前記ステータの外周面又は前記スリーブの内周面に第１の螺旋溝を設けると共に、前記ハウジングの内周面又は前記スリーブの外周面に第２の螺旋溝を設け、前記第１の螺旋溝を往路とし、前記第２の螺旋溝を復路として冷却液を流通させると共に、前記第１の螺旋溝の冷却液と前記第２の螺旋溝の冷却液とが互いに逆方向に流通するように、前記第１の螺旋溝の冷却液出口側後端と前記第２の螺旋溝の冷却液入口側始端とを連通する連通路を設け、二重の冷却液流通路構造にした回転軸装置が提供される。
前述のように、ビルトインモータのステータの外周面とハウジングの内周面に円筒状のスリーブを挟んで二重の螺旋溝を設け、二重の冷却液流通路構造に構成されている。このような構成であるから、二重の螺旋溝に冷却液を往路、復路として往復に流通させて、ハウジング各部の温度差を少なくすることができる。円筒状のスリーブの内周面と外周面に二重の螺旋溝を設ければ、螺旋溝の加工が容易に行える。 In order to achieve the above-mentioned object, according to the present invention, there is provided a rotary shaft device incorporating a motor, the housing being a frame, the rotary shaft rotatably supported by the housing, and the housing. A motor comprising a stator attached and a rotor attached to the rotating shaft, and a cylindrical sleeve fitted between the stator and the housing, the outer peripheral surface of the stator or the sleeve inner peripheral surface provided with a first spiral groove, the second spiral groove provided on the outer peripheral surface of the inner circumferential surface or said sleeve of said housing, and said first helical groove and forward, the second helix The coolant of the first spiral groove is circulated using the groove as a return path, and the coolant of the first spiral groove and the coolant of the second spiral groove are circulated in opposite directions. Outlet side rear end and said first The coolant inlet side starting end and the communication path for communicating the spiral grooves provided for, the rotary shaft apparatus which double cooling liquid flow channel structure is provided.
As described above, a double spiral groove is provided on the outer peripheral surface of the stator of the built-in motor and the inner peripheral surface of the housing with the cylindrical sleeve interposed therebetween, thereby forming a double coolant flow path structure. With such a configuration, the coolant can be circulated back and forth in the double spiral groove as a forward path and a return path, thereby reducing the temperature difference in each part of the housing. If a double spiral groove is provided on the inner peripheral surface and the outer peripheral surface of the cylindrical sleeve, the spiral groove can be easily processed.

本発明によれば、内蔵されたモータのステータの外周面とハウジングの内周面に、円筒状のスリーブを挟んで二重の螺旋溝を設けた。そして、冷却液を往路、復路として往復に流通させたので、ハウジング各部の温度差が少なくなり、熱変形が小さくなり、装置の精度が良くなった。また、円筒状のスリーブの内周面と該スリーブの外周面に螺旋溝を設け、二重の冷却液流通路構造にして、冷却液を往路、復路として往復に流通させたので、前述と同様に熱変形が小さくなり、装置の精度が良くなった。しかも、円筒状のスリーブに二重の螺旋溝を設けたので、螺旋溝の加工が容易で、装置が安価になった。   According to the present invention, the double spiral groove is provided between the outer peripheral surface of the stator of the built-in motor and the inner peripheral surface of the housing with the cylindrical sleeve interposed therebetween. Then, since the coolant was circulated back and forth as the forward path and the return path, the temperature difference in each part of the housing was reduced, thermal deformation was reduced, and the accuracy of the apparatus was improved. In addition, a spiral groove is provided on the inner peripheral surface of the cylindrical sleeve and the outer peripheral surface of the sleeve to form a double coolant flow passage structure, and the coolant is circulated back and forth as a forward path and a return path. As a result, thermal deformation was reduced and the accuracy of the device was improved. In addition, since the double spiral groove is provided in the cylindrical sleeve, it is easy to process the spiral groove and the apparatus is inexpensive.

以下、本発明による回転軸装置の好ましい実施の形態を図面に基づいて説明する。図１は、本発明の好ましい実施の形態を示す工作機械の主軸装置の断面図である。図２は、本発明の好ましい他の実施の形態を示す工作機械の回転テーブル装置の一部断面図である。
図１において、工作機械の主軸装置の枠体であるハウジング１は、図示しない工作機械本体に取付けられている。主軸３は軸受５、７を介してハウジング１に回転可能に支承されている。主軸３の先端部は、工具ホルダ装着のためのテーパ穴９が設けられている。この主軸装置はモータが内蔵されており、主軸３にロータ１１が取付けられ、ハウジング１の内周面にステータ１３が取付けられている。ハウジング１の内周面でステータ１３が取付けられている部位に円筒状のスリーブ１５が嵌着されている。スリーブ１５が抜け出さないように、カラー１７を介して押え板１９がスリーブ１５を押えている。装置の発熱部を冷却する冷却液は、図示していない公知の液温調整装置により温度調整されている。 Hereinafter, preferred embodiments of a rotating shaft device according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a spindle device of a machine tool showing a preferred embodiment of the present invention. FIG. 2 is a partial cross-sectional view of a rotary table device of a machine tool showing another preferred embodiment of the present invention.
In FIG. 1, a housing 1 that is a frame of a spindle device of a machine tool is attached to a machine tool main body (not shown). The main shaft 3 is rotatably supported on the housing 1 via bearings 5 and 7. A tapered hole 9 for mounting the tool holder is provided at the tip of the main shaft 3. This spindle device has a built-in motor, a rotor 11 is attached to the spindle 3, and a stator 13 is attached to the inner peripheral surface of the housing 1. A cylindrical sleeve 15 is fitted on the inner peripheral surface of the housing 1 where the stator 13 is attached. The presser plate 19 presses the sleeve 15 through the collar 17 so that the sleeve 15 does not come out. The temperature of the coolant for cooling the heat generating part of the device is adjusted by a known liquid temperature adjusting device (not shown).

ステータ１３の外周面には、ステータ１３を冷却するための冷却液を流す螺旋溝２１が設けられている。この螺旋溝２１は、始端２１ａから終端２１ｂに向って連続した螺旋に形成されている。ハウジング１の内周面には、ハウジング１を冷却するための冷却液を流す螺旋溝２３が設けられている。この螺旋溝２３は、始端２３ａから終端２３ｂに向って連続した螺旋に形成されている。螺旋溝２１と螺旋溝２３は、円筒状のスリーブ１５を挟んで二重の螺旋溝を形成している。螺旋溝２１の始端２１ａに冷却液を流入するための流入口２５が接続されている。螺旋溝２１の終端２１ｂと螺旋溝２３の始端２３ａは連通路２７で連通されている。螺旋溝２３の終端２３ｂに冷却液を回収するための回収口２９が接続されている。なお、別の実施の形態として、円筒状のスリーブ１５の内周面に螺旋溝２１を設け、該スリーブ１５の外周面に螺旋溝２３を設けても良い。   A spiral groove 21 through which a coolant for cooling the stator 13 flows is provided on the outer peripheral surface of the stator 13. The spiral groove 21 is formed in a continuous spiral from the start end 21a to the end end 21b. A spiral groove 23 through which a coolant for cooling the housing 1 flows is provided on the inner peripheral surface of the housing 1. The spiral groove 23 is formed in a continuous spiral from the start end 23a to the end end 23b. The spiral groove 21 and the spiral groove 23 form a double spiral groove with the cylindrical sleeve 15 interposed therebetween. An inflow port 25 is connected to the start end 21a of the spiral groove 21 to allow the coolant to flow in. A terminal end 21 b of the spiral groove 21 and a start end 23 a of the spiral groove 23 are communicated with each other through a communication path 27. A recovery port 29 for recovering the coolant is connected to the end 23 b of the spiral groove 23. As another embodiment, the spiral groove 21 may be provided on the inner peripheral surface of the cylindrical sleeve 15, and the spiral groove 23 may be provided on the outer peripheral surface of the sleeve 15.

図１に示す実施の形態では、冷却液を流入口２５から流入すると、冷却液は螺旋溝２１を流通し、連通路２７を通り、螺旋溝２３を逆方向に流通し、冷却液は回収口２９から回収される。冷却液は螺旋溝２１と螺旋溝２３の中を逆方向に流れるので、ステータ１３及びハウジング１の冷却効果が平均化され、ハウジング各部の温度差が小さくなり、装置の熱変形が小さくなった。従来の装置は、螺旋溝が一重であるので、冷却液流入付近は温度が低く、冷却液出口付近は温度が高くなり、定常的に温度勾配が発生していた。   In the embodiment shown in FIG. 1, when the cooling liquid flows in from the inlet 25, the cooling liquid flows through the spiral groove 21, passes through the communication path 27, flows through the spiral groove 23 in the reverse direction, and the cooling liquid flows through the recovery port. 29. Since the cooling liquid flows in the reverse direction in the spiral groove 21 and the spiral groove 23, the cooling effect of the stator 13 and the housing 1 is averaged, the temperature difference of each part of the housing is reduced, and the thermal deformation of the apparatus is reduced. In the conventional apparatus, since the spiral groove is single, the temperature is low near the coolant inflow, the temperature is high near the coolant outlet, and a temperature gradient is constantly generated.

図示していない別の実施の形態は、連通路２７を設けず、螺旋溝２１の終端２１ｂに冷却液の回収口を接続し、更に、螺旋溝２３の始端２３ａに冷却液の流入口を接続する。そして、冷却液を螺旋溝２１の始端２１ａから流入し、終端２１ｂから外に回収する。別経路で冷却液を螺旋溝２３の始端２３ａから流入し、終端２３ｂから外に回収する。このように二重の螺旋溝に冷却液を往路、復路として別経路で流すようにしても良い。   In another embodiment not shown, the communication passage 27 is not provided, a coolant recovery port is connected to the terminal end 21 b of the spiral groove 21, and a coolant inlet is connected to the start end 23 a of the spiral groove 23. To do. And a cooling fluid flows in from the start end 21a of the spiral groove 21, and collect | recovers outside from the termination | terminus 21b. In another path, the coolant flows from the start end 23a of the spiral groove 23 and is recovered outside from the end end 23b. In this way, the coolant may flow through the double spiral groove in different paths as the forward path and the return path.

図２は、他の実施の形態を示したものであり、工作機械の回転テーブル装置である。図２において、回転テーブル装置の枠体であるハウジング４１は、図示しない工作機械本体に取付けられている。回転テーブル４３は軸受４５を介してハウジング４１に回転可能に支承されている。この回転テーブル装置はモータが内蔵されており、回転テーブル４３の下部位にロータ４７が取付けられ、ハウジング４１の内周面にステータ４９が取付けられている。ハウジング１の内周面でステータ４９が取付けられている部位に、円筒状のスリーブ５１が取付けられている。   FIG. 2 shows another embodiment, which is a rotary table device of a machine tool. In FIG. 2, a housing 41 that is a frame of the rotary table device is attached to a machine tool main body (not shown). The rotary table 43 is rotatably supported on the housing 41 via a bearing 45. This rotary table device incorporates a motor, a rotor 47 is attached to the lower part of the rotary table 43, and a stator 49 is attached to the inner peripheral surface of the housing 41. A cylindrical sleeve 51 is attached to a portion where the stator 49 is attached on the inner peripheral surface of the housing 1.

図２に示す実施の形態では、円筒状のスリーブ５１の内周面に螺旋溝５３が設けられ、スリーブ５１の外周面に螺旋溝５５が設けられている。螺旋溝５３の始端５３ａに冷却液を流入するための流入口５７が接続され、螺旋溝５３の終端５３ｂと螺旋溝５５の始端５５ａが連通路５９で連通されている。螺旋溝５５の終端５５ｂに冷却液を回収するための回収口６１が接続されている。この実施の形態では、冷却液を流入口５７から流入すると、冷却液は螺旋溝５３を流通し、連通路５９を通り、螺旋溝５５を逆方向に流通し、冷却液は回収口６１から回収される。作用効果は前述の主軸装置の場合と同様である。また、円筒状のスリーブ５１に螺旋溝５３、５５を設けたので、螺旋溝の加工が容易で、装置が安価に製作できる。   In the embodiment shown in FIG. 2, the spiral groove 53 is provided on the inner peripheral surface of the cylindrical sleeve 51, and the spiral groove 55 is provided on the outer peripheral surface of the sleeve 51. An inlet 57 for injecting the cooling liquid is connected to the start end 53 a of the spiral groove 53, and the terminal end 53 b of the spiral groove 53 and the start end 55 a of the spiral groove 55 are communicated with each other through a communication path 59. A recovery port 61 for recovering the coolant is connected to the end 55 b of the spiral groove 55. In this embodiment, when the coolant flows in from the inlet 57, the coolant flows through the spiral groove 53, passes through the communication path 59, flows in the reverse direction through the spiral groove 55, and the coolant is recovered from the recovery port 61. Is done. The effect is the same as that of the above-mentioned main spindle device. In addition, since the spiral grooves 53 and 55 are provided in the cylindrical sleeve 51, the spiral grooves can be easily processed and the apparatus can be manufactured at low cost.

図示していないが、連通路５９を設けず、螺旋溝５３の終端５３ｂに回収口を接続し、螺旋溝５５の始端５５ａに流入口を接続して、別々に冷却液を往路、復路として流入するようにしてもよい。要は、二重の螺旋溝に冷却液を逆方向に流すことによって、ハウジング各部の温度差を少なくして、熱変形が小さい装置を得ることができる。なお、別の実施の形態として、ステータ４９の外周面に螺旋溝５３を設け、ハウジング４１の内周面に螺旋溝５５を設けても良い。   Although not shown, the communication passage 59 is not provided, the recovery port is connected to the terminal end 53b of the spiral groove 53, the inlet is connected to the start end 55a of the spiral groove 55, and the coolant flows separately as the forward path and the return path. You may make it do. In short, by flowing the cooling liquid in the reverse direction in the double spiral groove, the temperature difference between each part of the housing can be reduced, and a device with small thermal deformation can be obtained. As another embodiment, the spiral groove 53 may be provided on the outer peripheral surface of the stator 49 and the spiral groove 55 may be provided on the inner peripheral surface of the housing 41.

本発明の好ましい実施の形態を示す工作機械の主軸装置の断面図である。It is sectional drawing of the spindle apparatus of the machine tool which shows preferable embodiment of this invention. 本発明の好ましい他の実施の形態を示す工作機械の回転テーブル装置の一部断面図である。It is a partial cross section figure of the rotary table apparatus of the machine tool which shows other preferable embodiment of this invention.

符号の説明Explanation of symbols

１ ハウジング
３ 主軸
１１ ロータ
１３ ステータ
１５ スリーブ
２１、２３ 螺旋溝
４１ ハウジング
４３ 回転テーブル
４７ ロータ
４９ ステータ
５１ スリーブ
５３、５５ 螺旋溝 DESCRIPTION OF SYMBOLS 1 Housing 3 Main shaft 11 Rotor 13 Stator 15 Sleeve 21, 23 Spiral groove 41 Housing 43 Rotary table 47 Rotor 49 Stator 51 Sleeve 53, 55 Spiral groove

Claims (1)

モータが内蔵された回転軸装置であって、
枠体であるハウジングと、
前記ハウジングに回転可能に支承された回転軸と、
前記ハウジングに取付けられたステータと前記回転軸に取付けられたロータとからなるモータと、
前記ステータと前記ハウジングとの間に嵌着された円筒状のスリーブと、を具備し、
前記ステータの外周面又は前記スリーブの内周面に第１の螺旋溝を設けると共に、前記ハウジングの内周面又は前記スリーブの外周面に第２の螺旋溝を設け、前記第１の螺旋溝を往路とし、前記第２の螺旋溝を復路として冷却液を流通させると共に、前記第１の螺旋溝の冷却液と前記第２の螺旋溝の冷却液とが互いに逆方向に流通するように、前記第１の螺旋溝の冷却液出口側後端と前記第２の螺旋溝の冷却液入口側始端とを連通する連通路を設け、二重の冷却液流通路構造にしたことを特徴とする回転軸装置。 A rotary shaft device with a built-in motor,
A housing which is a frame,
A rotating shaft rotatably supported on the housing;
A motor comprising a stator attached to the housing and a rotor attached to the rotating shaft;
A cylindrical sleeve fitted between the stator and the housing,
Provided with an outer peripheral surface or the first spiral groove on the inner peripheral surface of the sleeve of the stator, the second spiral groove provided on the inner peripheral surface or outer peripheral surface of the sleeve of the housing, said first spiral groove In the outward path, the second spiral groove is used as a return path and the coolant is circulated, and the first spiral groove and the second spiral groove are circulated in opposite directions. A rotation characterized in that a communication path is provided to connect the rear end on the coolant outlet side of the first spiral groove and the start end on the coolant inlet side of the second spiral groove to form a double coolant flow path structure. Axle device.
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