JP3195092U - Motor direct drive type rotary table device - Google Patents

Abstract

There is provided a clamping structure capable of obtaining a strong and sufficient clamping force even in a rotary table device of a motor direct drive type. A fixed clamp portion of a direct drive type rotary table device includes a fixed sleeve that is coupled to a fixed member, and an outer clamp that is fixedly attached to an outer periphery of the fixed sleeve and faces an inner peripheral surface of a rotary sleeve. A member 41, an inner clamp member 42 which is fixedly attached to the inner periphery of the fixed sleeve and faces the outer peripheral surface of the rotary shaft 22, and is a passage provided in the fixed sleeve, and includes an outer hydraulic chamber 43 and an inner hydraulic chamber 44. A communication passage 51 that communicates with a fluid pressure supply that is provided in the fixed sleeve and that presses the outer clamp member and the inner clamp member against the opposing member by supplying the hydraulic pressure to the outer hydraulic chamber and the inner hydraulic chamber. And a passage 52. [Selection] Figure 1

Description

  The present invention relates to a motor direct drive type rotary table device that directly drives a rotary table with a motor, and more particularly, to a clamp structure of a rotary table device that clamps the rotary table in a non-rotatable manner.

  Since the motor direct drive type rotary table device does not have a gear mechanism such as a worm wheel and a worm gear for driving the rotary table in the device, it is advantageous in reducing the size and speed of the device. An example of such an apparatus is described in Japanese Patent Application Laid-Open No. 2009-248244 (Patent Document 1). The device described in Patent Document 1 rotates a rotary table that determines an angle, a fixing member (a device main body including a housing) that rotatably supports the rotary table, a direct drive motor that drives the rotary table, and a rotary table. A clamping mechanism for impossible clamping. This clamping mechanism will be described. A cylindrical sleeve is coaxially provided on the back surface of the rotary table, and a hydraulic chamber is disposed on a non-rotating fixed member facing the inner peripheral surface of the sleeve. Then, by supplying and pressurizing the hydraulic chamber, the thin portion of the fixing member that is formed thin and defines the hydraulic chamber is inflated and deformed to contact the sleeve.

JP 2009-248244 A (FIG. 1)

  As a first problem, there is a case where the rotary table cannot be clamped with sufficient force in the motor direct drive type rotary table device. That is, in the apparatus described in Patent Document 1, in the cylindrical sleeve provided on the back surface of the rotary table, the outer peripheral surface of the sleeve is a direct drive type rotor, and the inner peripheral surface of the sleeve is clamped. That is, only the inner peripheral surface of the sleeve is clamped in the rotary table. Then, when the radial dimension of the sleeve is small, the area of the inner peripheral surface of the sleeve is reduced, and a sufficient contact area between the thin wall portion and the inner peripheral surface of the sleeve cannot be ensured, and the rotary table is reliably secured. Can not be clamped.

  As a second problem, since Patent Document 1 aims to reduce the device size in the axial direction of the rotating shaft, the axial size of the sleeve is reduced. If it does so, the area of the internal peripheral surface of a sleeve will also become small, the contact area of a thin part and a sleeve internal peripheral surface cannot fully be ensured, and a rotary table cannot be clamped reliably.

  An object of the present invention is to provide a clamping structure capable of obtaining a strong and sufficient clamping force even in the case of a motor direct drive type rotary table device in view of the above situation.

  To this end, a motor direct drive type rotary table device according to the present invention includes a rotary table having a rotary shaft and a rotary sleeve arranged coaxially with the rotary shaft, a fixing member that rotatably supports the rotary table, and a rotary sleeve Including a motor rotor provided on the outer periphery of the motor and a motor stator provided on the fixing member so as to face the motor rotor, and a direct drive motor for driving the rotary table, and a radial clearance formed between the rotary sleeve and the rotary shaft And a fixing clamp portion supported by the fixing member. The fixed clamp portion includes a fixed sleeve that is coupled to the fixed member, an outer clamp member that is fixedly attached to the outer periphery of the fixed sleeve and faces the inner peripheral surface of the rotary sleeve, and a rotary shaft that is fixedly attached to the inner peripheral surface of the fixed sleeve. An inner clamp member facing the outer peripheral surface of the inner sleeve, a passage provided in the fixed sleeve and an outer hydraulic pressure chamber formed between the outer clamp member and the fixed sleeve, and an inner hydraulic pressure formed between the inner clamp member and the fixed sleeve A fluid pressure that presses the outer clamp member and the inner clamp member against the opposing member by supplying fluid pressure to the outer fluid pressure chamber and the inner fluid pressure chamber. And a supply passage.

  According to the present invention, since the fixed clamp portion has the outer clamp member and the inner clamp member, the motor direct drive type rotary table is securely clamped with sufficient force by the double clamping action by these two types of clamp members. can do. In addition, since the outer clamp member, the inner clamp member, and the fixing sleeve are configured as separate members, by selecting appropriate thickness dimensions, shapes, and materials for the outer clamp member and the inner clamp member, the outer clamp The distribution of the force and the inner clamping force can be made suitable, and the rotary table can be clamped efficiently. In addition, the outer hydraulic chamber that presses the outer clamp member against the mating member and the inner hydraulic chamber that presses the inner clamp member against the mating member communicate with each other via a communication passage provided in the fixed sleeve. The hydraulic pressure can be simultaneously supplied to the hydraulic chamber. Therefore, it is possible to provide a double clamping type motor direct drive type rotary table device having excellent responsiveness.

  Although the positional relationship between the rotary shaft and the rotary sleeve is not particularly limited, as one embodiment of the present invention, the two rotary shafts protrude from the back surface of the table board of the rotary table and have a rotary sleeve support portion that supports the rotary sleeve at the tip. The fixing member includes a fixing sleeve support portion that is interposed between the back surface of the table board and the rotating sleeve and supports the fixing sleeve. According to this embodiment, the rotating sleeve can be separated from the back surface of the table board. Alternatively, as another embodiment of the present invention, the rotary sleeve may be directly supported by the table board by connecting the rotary sleeve coaxially to the back surface of the table board without providing the rotary sleeve support portion.

  The outer clamp member only needs to be attached and fixed to the outer periphery of the fixed sleeve, and the shape thereof is not particularly limited. As a preferred embodiment of the present invention, the three outer clamp members have a cylindrical shape, and both end portions in the axial direction are formed thick and the central portion in the axial direction is formed thin to define the outer hydraulic chamber. According to this embodiment, since the axial center part of the outer clamp member is thin, it can be easily elastically deformed. Therefore, by expanding the outer hydraulic pressure chamber, the axial center portion of the outer clamp member can be elastically deformed toward the rotating sleeve.

  The structure for attaching the outer clamp member to the fixed sleeve is not particularly limited. As a further preferred embodiment of the present invention, the four outer clamp members include a first flange portion formed at one end in the axial direction, and the first flange portion is attached and fixed to the fixed sleeve support portion. According to this embodiment, the outer clamp member can be securely attached and fixed to the fixed sleeve side by the flange portion. As another embodiment of the present invention, the outer clamp member may not be provided with a flange portion, and both end portions in the axial direction of the outer clamp member may be attached and fixed to the fixing sleeve.

  The inner clamp member only needs to be attached and fixed to the inner periphery of the fixed sleeve, and the shape thereof is not particularly limited. As a preferred embodiment of the present invention, the five inner clamp members have a cylindrical shape, and both end portions in the axial direction are formed thick and the central portion in the axial direction is formed thin, thereby defining the inner hydraulic chamber. According to this embodiment, since the axial center part of the inner clamp member is thin, it can be easily elastically deformed. Therefore, the axial center part of the inner clamp member can be elastically deformed toward the rotation axis by expanding the inner hydraulic chamber.

  The structure for attaching the inner clamp member to the fixing sleeve is not particularly limited. As a further preferred embodiment of the present invention, the 6 inner clamp member includes a second flange portion formed at one end portion in the axial direction, and the second flange portion is attached and fixed to one end portion in the axial direction of the fixed sleeve support portion or the fixed sleeve. The According to this embodiment, the inner clamp member can be securely attached and fixed to the fixing sleeve side by the flange portion. As another embodiment of the present invention, the inner clamp member does not have a flange portion, and both end portions in the axial direction of the inner clamp member may be attached and fixed to a fixing sleeve.

  Thus, according to the present invention, a powerful and sufficient clamping force can be obtained even with a motor direct drive type rotary table device. In addition, it is possible to provide a double clamping motor direct drive type rotary table device that can supply hydraulic pressure to the outer hydraulic pressure chamber and the inner hydraulic pressure chamber at the same time and has excellent responsiveness.

It is a longitudinal cross-sectional view which shows the motor direct drive type rotary table apparatus which becomes one Example of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a motor direct drive type rotary table device according to an embodiment of the present invention. The motor direct drive type rotary table device 10 includes a rotary table 11, a non-rotating fixed member 12, a motor 13 provided across the rotary table 11 and the fixed member 12, a fixed clamp portion 14, and a rotary joint 15. Bearings 16 and 17 provided between the table 11 and the fixing member 12 are provided.

  The rotary table 11 is rotatably supported via bearings 16 and 17 and rotates around an axis O indicated by a one-dot chain line in FIG. The rotary table 11 includes a disk-shaped table board 21, a rotary shaft 22 attached and fixed to the back surface of the table board 21, and a rotary sleeve 23 supported at the tip of the rotary shaft 22. The table board 21 has a surface 11f orthogonal to the axis O, and supports a workpiece or another machine tool on the surface 11f side. The rotary shaft 22 is a cylindrical body that is fixedly attached to the table board 21 with bolts, protrudes from the back surface of the table board 21, and extends coaxially with the axis O. The rotary shaft 22 accommodates the rotary joint 15 in its center hole. With respect to the extending direction of the axis O, the surface 11f side of the table board 21 is also referred to as the front or front side of the motor direct drive type rotary table device 10, and the back side of the table board 21 is set behind or behind the motor direct drive type rotary table device 10. Also referred to as the rear side, the front end of the rotating shaft 22 protruding from the back surface of the table board 21 is also referred to as the rear end.

  A rotary sleeve support member 24 is attached and fixed to the rear end of the rotary shaft 22 on the rear side of the motor direct drive type rotary table device 10 by bolts. The rotating sleeve support member 24 is an annular disk and extends outward from the rotating shaft 22. The rotating sleeve 23 is attached and fixed to the outer peripheral edge of the rotating sleeve support member 24 by bolts.

  The rotary sleeve 23 is a cylindrical body, is disposed coaxially with the axis O, and protrudes forward from the rotary sleeve support member 24. However, the rotary sleeve 23 is separated from the table board 21 and the rotary shaft 22. The rotating sleeve 23 constitutes the rotor of the motor 13, and the outer peripheral surface of the rotating sleeve 23 faces the stator 34 of the motor 13 through a slight radial gap. The motor 13 will be described later. In addition, the inner peripheral surface of the rotary sleeve 23 is located away from the outer peripheral surface of the rotary shaft 22, and a fixed sleeve 33 described later is disposed in an annular space formed between the rotary sleeve 23 and the rotary shaft 22. Is done. Thus, the rotation sleeve 23 is attached and fixed to the table board 21 via the rotation sleeve support member 24 and the rotation shaft 22 in order, and rotates together with the table board 21.

  The fixing member 12 is non-rotating and includes a housing 31 and a fixing sleeve support portion 32 and supports the fixing clamp portion 14. The housing 31 forms a housing of the motor direct drive type rotary table device 10, and the fixed sleeve support portion 32 is attached and fixed by bolts. The fixed sleeve support portion 32 is an annular disk having a front surface and a rear surface, and is positioned rearward of the table board 21, and the rotating shaft 22 is inserted through a central hole of the table board 21. Further, the fixed sleeve support portion 32 has an inner annular step that is directed in the inner diameter direction and an outer annular step that is directed in the outer diameter direction. A bearing 16 is interposed in an annular space formed between the inner annular step of the fixed sleeve support portion 32 and the outer peripheral surface on the front end side of the rotating shaft 22. The bearing 16 is a radial ball bearing (rolling bearing), but is not limited thereto.

  A stator 34 of the motor 13 is attached and fixed to the housing 31 by bolts. The stator 34 generates a rotational torque around the axis O by an electromagnetic action with the rotary sleeve 23 which is a member of the rotary table 11 and also serves as the rotor of the motor 13. Thus, since the motor 13 directly drives the rotary table 11 without using a mechanical gear structure, it is called a direct drive type motor.

  Here, the rotary joint 15 is added. The rotary joint 15 extends along the axis O, and includes a rotating cylinder 25 that is a rotation side member and a non-rotating shaft 35. The rotary cylinder 25 is passed through the central hole of the table board 21 and the central hole of the rotary shaft 22, and the front end of the rotary cylinder 25 is attached and fixed to the rotary table 11 with a bolt. The rear end of the shaft 35 is fixed to the housing 31 with a bolt. The front end region of the shaft 35 is sequentially inserted into the center hole of the rotating sleeve support member 24, the center hole of the rotating shaft 22, and the center hole of the rotating cylinder 25. The outer peripheral surface of the front end region of the shaft 35 faces the inner peripheral surface of the rotary cylinder 25.

  A plurality of passages 26 are formed in the rotary cylinder 25 having a predetermined thickness in the radial direction. A plurality of passages 36 are formed in the shaft 35. Each passage 26 and each passage 36 are connected to each other on the inner peripheral surface of the rotary cylinder 25 and the outer peripheral surface of the shaft 35. The respective connection points are arranged at intervals in the direction of the axis O, and are arranged in order so as not to cross each other. Bearings 18 and 19 are disposed at the front end and the rear end of the rotary cylinder 25, respectively. The rotary cylinder 25 is rotatably supported by the front end region of the shaft 35 via bearings 18 and 19.

  The fixed clamp portion 14 has a structure that holds the rotary table 11 so as not to rotate, and includes a fixed sleeve 33, an outer clamp member 41, and an inner clamp member 42.

  The fixing sleeve 33 has a cylindrical shape and extends rearward from the inner edge of the annular fixing sleeve support portion 32. The fixed sleeve 33 is integrally formed with the fixed sleeve support portion 32. The outer clamp member 41 is attached and fixed to the outer peripheral surface of the fixing sleeve 33 by a bolt 45. An inner clamp member 42 is attached and fixed to the inner peripheral surface of the fixing sleeve 33 by a bolt 46.

  The outer clamp member 41 has a cylindrical shape and is formed thick at both ends of the axis O direction. Further, the central region 41m in the axis O direction of the outer clamp member 41 is formed thinner than both ends, and the inner peripheral surface of the outer clamp member 41 is recessed. The central region 41 m of the outer clamp member 41 forms an outer hydraulic chamber 43 with the outer peripheral surface of the fixed sleeve 33.

  A flange portion 41f is formed at the front end portion of the outer clamp member 41 in the axis O direction. A plurality of through holes extending in parallel with the axis O are formed in the flange portion 41f, and bolts 45 are passed through the through holes from the rear. The male screw portion of the bolt 45 is screwed into a female screw hole formed in the fixed sleeve support portion 32 and extending in parallel with the axis O. A seal material 47 such as an O-ring is interposed between the inner peripheral surface of both ends of the outer clamp member 41 in the axis O direction and the outer peripheral surface of the fixing sleeve 33. Thereby, the outer hydraulic pressure chamber 43 is liquid-tight.

  Similarly, the inner clamp member 42 has a cylindrical shape and is formed thick at both ends of the axis O direction. A central region 42m in the direction of the axis O of the inner clamp member 42 is formed thinner than both ends, and the outer peripheral surface of the inner clamp member 42 is recessed. A central region 42 m of the inner clamp member 42 forms an inner hydraulic pressure chamber 44 with the inner peripheral surface of the fixed sleeve 33. The inner hydraulic chamber 44 is arranged on the inner diameter side with respect to the outer hydraulic chamber 43.

  A flange portion 42 f is formed at the front end portion of the inner clamp member 42 in the axis O direction. A plurality of through holes extending in parallel with the axis O are formed in the flange portion 42f, and bolts 46 are passed through the through holes from the front. The male threaded portion of the bolt 46 is screwed into a female threaded hole that is formed at one end of the fixing sleeve 33 in the direction of the axis O and extends parallel to the axis O. A sealing material 48 such as an O-ring is interposed between the outer peripheral surface of both end portions in the axis O direction of the inner clamp member 42 and the inner peripheral surface of the fixing sleeve 33. As a result, the inner hydraulic chamber 44 is liquid-tight.

  A communication passage 51 and a hydraulic pressure supply passage 52 are formed in the fixed sleeve 33. The communication passage 51 extends through the fixed sleeve 33 in the radial direction, and both ends thereof are connected to the outer hydraulic chamber 43 and the inner hydraulic chamber 44, respectively. The hydraulic pressure supply passage 52 is formed in the radial thickness of the fixed sleeve 33, branches from the communication passage 51, and extends in parallel with the axis O. The hydraulic pressure supply passage 52 further extends from the fixed sleeve 33 to the fixed sleeve support portion 32 and is formed inside the wall thickness of the fixed sleeve support portion 32. The hydraulic pressure supply passage 52 that is bent into a crank shape inside the wall thickness of the fixed sleeve support portion 32 and extends in the radial direction and the axis O direction is connected to a hydraulic pressure supply passage 53 formed in the wall thickness of the housing 31. One end of the fluid pressure supply passage 53 is connected to the fluid pressure supply passage 52 described above, and the other end of the fluid pressure supply passage 53 is connected to a fluid pressure source (not shown).

  The bearing 17 is interposed in an annular space between the inner peripheral surface of the rear end portion in the axis O direction of the fixing sleeve 33 and the outer peripheral surface of the rear end portion in the axis O direction of the rotary shaft 22 behind the inner clamp member 42. To do. The bearing 17 is a tapered roller bearing (rolling bearing), but is not limited thereto. The outer raceway surface of the bearing 17 attached and fixed to the fixed sleeve 33 is oriented in the inner diameter direction and rearward. Further, the inner raceway surface of the bearing 17 attached and fixed to the rotary shaft 22 is oriented in the outer diameter direction and forward. Thus, the bearing 17 receives the radial load of the turntable 11 and the thrust load acting from the front to the rear.

  Next, the function of the clamp mechanism including the fixed clamp portion 14, the rotary shaft 22, and the rotary sleeve 23 will be described.

  When the rotary table 11 is clamped so as not to rotate, a hydraulic pressure higher than a predetermined value is supplied to a hydraulic pressure supply passage 53 from a hydraulic pressure source (not shown) provided in the housing 31. The hydraulic pressure supply passages 53 and 52, the communication passage 51, the outer hydraulic pressure chamber 43, and the inner hydraulic pressure chamber 44 are prefilled with hydraulic fluid, and the hydraulic pressure is simultaneously applied to the outer hydraulic pressure chamber 43 and the inner hydraulic pressure chamber 44. Works. Then, the outer hydraulic chamber 43 and the inner hydraulic chamber 44 expand, the central region 41m of the outer clamp member 41 is elastically deformed and protrudes in the outer diameter direction, and the central region 42m of the inner clamp member 42 is elastically deformed and deformed. Overhang in the direction. The central region 41m presses the inner peripheral surface of the rotary sleeve 23, and the central region 42m presses the outer peripheral surface of the rotary shaft 22, thereby realizing the clamp state of the rotary table 11.

  In the case of releasing the clamped state, it is preferable to stop supplying the hydraulic pressure above a predetermined value and return the hydraulic pressure of the hydraulic fluid to a low pressure (for example, atmospheric pressure). As a result, the outer clamp member 41 and the inner clamp member 42 naturally return to their original shapes, and the central regions 41m and 42m do not press the mating members (the rotary shaft 22 and the rotary sleeve 23).

  By the way, according to the present embodiment, the fixed clamp portion 14 is fixed to the fixed member 33, and the outer clamp member 41 is attached and fixed to the outer periphery of the fixed sleeve 33 and faces the inner peripheral surface of the rotating sleeve 23. The inner clamp member 42 that is fixedly attached to the inner periphery of the fixed sleeve 33 and faces the outer peripheral surface of the rotary shaft 22, and a passage provided in the fixed sleeve 33 that communicates the outer hydraulic chamber 43 and the inner hydraulic chamber 44. A communication passage 51 to be connected to the fixing sleeve 33 and a counterpart member that faces the outer clamp member 41 and the inner clamp member 42 by supplying hydraulic pressure to the outer hydraulic pressure chamber 43 and the inner hydraulic pressure chamber 44. A rotary sleeve 23 and a hydraulic pressure supply passage 52 that presses against the rotary shaft 22 are provided.

  Thus, a double clamping action is realized by the outer clamp of the outer clamp member 41 and the inner clamp of the inner clamp member 42, and the motor direct drive type rotary table can be reliably clamped with sufficient force. In addition, since the outer clamp member 41, the inner clamp member 42, and the fixing sleeve 33 are configured as separate members, appropriate thickness dimensions, shapes, and materials are selected for the outer clamp member 41 and the inner clamp member 42. Thus, the distribution of the clamping force of the outer clamping member 41 and the clamping force of the inner clamping member 42 can be made suitable, and the rotary table 11 can be efficiently clamped. In addition, an outer hydraulic pressure chamber 43 that presses the outer clamp member 41 against the mating member (rotating sleeve 23) and an inner hydraulic pressure chamber 44 that presses the inner clamping member against the mating member (rotating shaft 22) are provided in the fixed sleeve 33. Since the communication is made via the 51, the hydraulic pressure can be simultaneously supplied to the outer hydraulic pressure chamber 43 and the inner hydraulic pressure chamber 44. Therefore, it is possible to provide the double clamping type motor direct drive type rotary table device 10 having excellent responsiveness.

  Further, according to the present embodiment, the rotary shaft 22 extends rearward from the back surface of the table board 21 of the rotary table 11, and includes the rotary sleeve support member 24 that supports the rotary sleeve 23 at the rear end of the rotary shaft 22. The fixing member 12 includes a fixing sleeve support portion 32 that is interposed between the back surface of the table board 21 and the rotating sleeve 23 and supports the fixing sleeve 33. Thereby, the rotary sleeve 23 can be separated from the back surface of the table board 21.

  Further, according to the present embodiment, the outer clamp member 41 has a cylindrical shape, and both end portions in the axis O direction of the outer clamp member 41 are formed thick, and the central region 41m of the outer clamp member 41 in the axis O direction is formed. The outer hydraulic chamber 43 is partitioned by being thin. Thus, since the central area 41m is thin, it can be easily elastically deformed. Therefore, by expanding the outer hydraulic pressure chamber 43, the axial center region 41 m of the outer clamp member 41 can be elastically deformed toward the rotating sleeve 23.

  Moreover, according to this embodiment, the outer side clamp member 41 contains the flange part 41f formed in the axis line O direction one end part. The flange portion 41f is attached and fixed to the fixed sleeve support portion 32. Accordingly, the outer clamp member 41 can be securely attached and fixed to the fixing sleeve 33 side by the flange portion 41f.

  Further, according to the present embodiment, the inner clamp member 42 has a cylindrical shape, and both end portions in the axis O direction are formed thick, and the central region 42m in the axis O direction is formed thin so that the inner hydraulic chamber 44 is formed. Partition. Thus, since the central area 42m is thin, it can be easily elastically deformed. Therefore, by expanding the inner hydraulic chamber 44, the axial center region 42 m of the inner clamp member 42 can be elastically deformed toward the rotating shaft 22.

  Further, according to the present embodiment, the inner clamp member 42 includes the flange portion 42 f formed at one end portion in the axis O direction, and the flange portion 42 f is attached and fixed to the one end portion in the axis O direction of the fixing sleeve 33. Accordingly, the inner clamp member 42 can be securely attached and fixed to the fixing sleeve 33 side by the flange portion 42f.

  Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same range as the present invention or within an equivalent range.

  The motor direct drive type rotary table device according to the present invention is advantageously used in machine tools.

10 motor direct drive type rotary table device, 11 rotary table,
12 fixing member, 13 motor, 14 fixing clamp part,
15 Rotary joints 16, 17, 18, 19 Bearings,
21 table board, 22 rotating shaft, 23 rotating sleeve,
24 rotating sleeve support member, 31 housing,
32 fixed sleeve support, 33 fixed sleeve,
34 Stator, outer clamp member, 41f flange part,
41m central region, 42 inner clamp member, 42f flange part,
42m central area, 43 outer hydraulic chamber, 44 inner hydraulic chamber,
45,46 bolt, 47,48 sealing material, 51 communication passage,
52, 53 Fluid pressure supply passage, O axis.

Claims (6)

A rotary table having a rotary shaft and a rotary sleeve arranged coaxially with the rotary shaft;
A fixing member that rotatably supports the rotary table;
A direct drive motor for driving the rotary table, including a motor rotor provided on an outer periphery of the rotary sleeve and a motor stator provided on the fixed member so as to face the motor rotor;
A fixed clamp portion disposed in a radial gap formed between the rotating sleeve and the rotating shaft and supported by the fixing member;
The fixed clamp portion includes a fixed sleeve coupled to the fixed member, an outer clamp member that is fixedly attached to the outer periphery of the fixed sleeve and faces the inner peripheral surface of the rotating sleeve, and is fixed to the inner periphery of the fixed sleeve. An inner clamp member facing the outer peripheral surface of the rotating shaft, a passage provided in the fixed sleeve, an outer hydraulic chamber formed between the outer clamp member and the fixed sleeve, the inner clamp member, and the A communication passage communicating between the inner hydraulic pressure chambers formed between the fixed sleeves, and a passage provided in the fixed sleeve, and supplying the hydraulic pressure to the outer hydraulic pressure chambers and the inner hydraulic pressure chambers to thereby provide the outer clamps. Motor direct drive type rotary table having a member and a hydraulic pressure supply passage that presses the inner clamp member against a mating member facing each other Location. The rotating shaft includes a rotating sleeve support portion that protrudes from a back surface of the table board of the rotating table and supports the rotating sleeve at a tip.
2. The motor direct drive type rotary table device according to claim 1, wherein the fixing member includes a fixing sleeve supporting portion that is interposed between a back surface of the table board and the rotating sleeve and supports the fixing sleeve.   3. The motor according to claim 2, wherein the outer clamp member has a cylindrical shape, and both end portions in the axial direction are formed thick and a central portion in the axial direction is formed thin to partition the outer hydraulic chamber. Direct drive type rotary table device. The outer clamp member includes a first flange portion formed at one end in the axial direction,
4. The motor direct drive type rotary table device according to claim 2, wherein the first flange portion is attached and fixed to the fixed sleeve support portion. 5.   The inner clamp member has a cylindrical shape, and both end portions in the axial direction are formed thick, and a central portion in the axial direction is formed thin to partition the inner hydraulic chamber. A motor direct drive type rotary table device according to claim 1. The inner clamp member includes a second flange portion formed at one end in the axial direction,
The motor direct drive type rotary table device according to any one of claims 2 to 5, wherein the second flange portion is fixedly attached to one end portion in the axial direction of the fixed sleeve support portion or the fixed sleeve.

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