JP6626146B2 - Rotary table device - Google Patents

Description

  The present invention relates to a rotary table device of a motor direct drive type in which a rotary table is directly driven by a motor, and particularly to a cooling structure inside the rotary table device.

  For example, a device described in Japanese Patent Application Laid-Open No. 2008-302485 (Patent Document 1) is known as a rotary indexing device for rotationally indexing a work. The apparatus described in Patent Literature 1 includes a table plate on which a work is placed, a table rotating shaft erected on the back surface of the table plate, a frame rotatably supporting the table rotating shaft, and a table rotating shaft. A worm wheel to be fixed and a worm meshing with the worm wheel are provided, and the table plate is rotated by the worm mechanism. Further, the apparatus described in Patent Document 1 has a refrigerant passage formed inside a table plate, a supply-side guideway connected to an inlet of the refrigerant passage, a recovery-side guideway connected to an outlet of the refrigerant passage, and an outside of a frame. A pump that sends out the refrigerant installed in the frame, a heat exchanger that is installed outside the frame and cools the refrigerant, and a rotary joint that connects the pump and the supply-side guideway and connects the recovery-side guideway and the heat exchanger. Prepare. Thereby, the table plate is cooled.

JP 2008-302485 A

  By the way, instead of the worm mechanism described in Patent Document 1, there is a motor direct drive type rotary table device in which an electric motor is arranged coaxially with a table rotating shaft, and the table is directly rotated by the electric motor without reducing the rotation by a gear set. Proposed. In the case of the direct drive type of the motor, there is a problem that the electric motor installed inside the rotary table device generates heat, and the heat is easily stored.

  Further, when a rotary table directly driven by a motor mounted on a machining center is used as a spindle for turning, the spindle rotates at a high speed of 1000 rotations or more per minute. In this case, the amount of heat generated by the direct drive electric motor installed inside the rotary table device increases, and cooling measures are required.

  However, the cooling structure described in Patent Literature 1 can cool the table plate, but cannot cool the table rotating shaft that generates the most heat.

  The present invention has been made in view of the above circumstances, and has as its object to provide a structure capable of cooling the inside of a rotary table device in a rotary table device of a motor direct drive type.

For this purpose, a rotary table apparatus according to the present invention comprises a table plate having a front surface and a rear surface, a table spindle having a center hole fixed to a rear surface of the table plate at a front end, and a front end region having a center hole formed in the table spindle. A device body having a shaft portion inserted into the shaft portion, a flange portion formed at the rear end of the shaft portion, and a frame fixed to the flange portion, the frame rotatably supporting the table main shaft via a bearing, In a device provided with a motor stator and a motor rotor which are provided on a pair of a table main shaft and a frame, respectively, an outer peripheral surface of a shaft portion and an inner peripheral surface of a center hole of the table main shaft are radially opened and a shaft gap extending in an axial direction is formed. compartment, and the device body is provided on the shaft portion so as to extend from the rear end of the shaft portion to the front end region A first passage having one end communicating with the outside of the other end the apparatus main body with leading to the shaft gap, the external end provided at a rear end portion and / or the flange portion of the shaft portion of the other end the apparatus main body with leading to the shaft gap And a second passage communicating with the second passage, wherein one of the first passage and the second passage is used as a coolant supply passage, and the other is used as a coolant collection passage, and the coolant flows through the gap between the shafts.

  According to the present invention, in the rotary table device in which the table plate and the table main shaft are directly driven by the motor, the cooling liquid flows through the gap between the table main shaft and the shaft portion to actively cool the table main shaft. Therefore, even when the direct drive type electric motor is operated at a high rotation speed, it is possible to prevent the inside of the rotary table device from becoming hot. One end of the first passage may directly communicate with the shaft gap, or may indirectly communicate with the shaft gap via another passage or another gap. The same applies to one end of the second passage.

  The numbers of the first passage and the second passage are not particularly limited. A rotary table device according to one aspect of the present invention has a plurality of first passages and / or second passages. According to this aspect, the flow rate flowing through the gap between the table main shaft and the shaft portion can be increased, and the inside of the rotary table device can be effectively cooled. The first passage and / or the second passage may branch off in the middle. As another aspect, one first passage and one second passage may be provided.

  As a preferable aspect of the present invention, a joint sleeve which is a hollow member provided in a table plate body, is disposed in a center hole of a table main shaft, and a shaft portion is passed through a hollow portion, a table-side port provided in the joint sleeve, a shaft The apparatus further includes a rotary joint that has a device body side port provided in the unit and faces the table side port, and transfers fluid between the device body side port and the table side port. The pair of the apparatus main body side port and the table side port may be one pair or plural pairs. As another aspect, the rotary joint may not be provided in the rotary table device.

  As a further preferred aspect of the present invention, the outer peripheral surface of the joint sleeve and the inner peripheral surface of the center hole of the table main shaft define a sleeve gap, and the joint sleeve is provided with a cooling passage extending from the table side port to the sleeve gap. The passage is connected to the cooling passage via a rotary joint, and the sleeve clearance is connected to the shaft clearance described above. According to this aspect, the area around the rotary joint can be cooled.

  The layout of the direct drive type electric motor and the bearings is not particularly limited, but as one aspect of the present invention, the motor rotor is provided on the outer peripheral surface of the table main shaft, the motor stator faces the motor rotor in the radial direction, and the bearing is mounted on the table axis. Is located between the axial position of the table plate and the axial position of the motor stator. According to this aspect, it is possible to reduce the diameter of the motor, bring the motor closer to the table main shaft, and effectively cool the motor. Also, the bearing and the electric motor can be aligned axially forward and backward.

The above-described coolant passage is a first cooling passage for cooling the table spindle. The present invention may further include a separate cooling passage. Apparatus main body as another aspect further includes a cooling liquid circuit of the second system that is provided in parallel with the coolant circuit of the first system, rear surface of the table plate is in sliding contact with the front surface of the frame, cooling of the second system the fluid circuit includes a motor stator cooling passages disposed along the sliding surface cooling passage, the bearing cooling passages are disposed along the bearing and the motor stator, disposed along the front surface of the frame, these sliding surfaces cooled The coolant flows through the passage, the bearing cooling passage, and the motor stator cooling passage. According to this aspect, the inside of the rotary table device can be more effectively cooled.

  As described above, according to the present invention, since the table spindle inside the rotary table device is efficiently cooled, heat does not stay inside the rotary table device. Therefore, in the rotary table device of the motor direct drive type, the table can be rotated at high speed for a long time without any problem.

It is a longitudinal section showing a rotary table device concerning one embodiment of the present invention. It is a typical longitudinal section showing other embodiments of the present 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 rotary table device according to one embodiment of the present invention. The rotary table device 10 includes a rotating table plate 11 and a table spindle 12, a non-rotating frame front end member 21, a frame support member 22, a frame rear end member 23, a shaft portion 24, a flange portion 25, and a clamp member 26. , A motor 13 provided over the frame support member 22 and the table main shaft 12, and bearings 16, 17 provided between the frame front end member 21 and the table main shaft 12.

  The table plate body 11 is, for example, a circular table, and has a front surface 11c and a rear surface, and chucks a work (not shown) on the front surface 11c constituting the table surface. The table main shaft 12 is fixed to the rear center portion 11e of the table back surface by a coupling means such as a bolt 11b. A rear outer diameter portion 11d of the table rear surface faces the non-rotating frame front end member 21. An annular seal member 11f is provided on the rear outer diameter portion 11d. The sealing material 11f seals a very small gap between the table plate 11 and the frame front end member 21 and prevents dust from entering the inside of the rotary table device 10 from outside.

  The table main shaft 12 is a hollow shaft centered on the axis O, and is connected at the front end to the back center part 11e. In addition, the table spindle 12 is rotatably supported by the apparatus main body of the rotary table apparatus 10 via bearings 16 and 17 in a front end region, and rotates about an axis O indicated by a chain line in FIG. With respect to the extending direction of the axis O, the front surface 11c side of the table plate 11 is also referred to as the front or front side of the rotary table device 10, and the rear surface 11d side of the table plate 11 is also referred to as the rear or rear side of the rotary table device 10. The front end of the table main shaft 12 protruding from the back center part 11e of the table plate body 11 is also called the rear end.

  The rotating flange member 15 is attached and fixed to the center part of the table main shaft 12 in the direction of the axis O by a coupling means such as a bolt 12b. The rotary flange member 15 is an annular disk, and extends from the center of the table main shaft 12 in the direction of the axis O toward the outer diameter side. A motor rotor 14 of the motor 13 is attached and fixed to an outer peripheral edge of the rotary flange member 15 by a coupling means such as a bolt 15b.

  The motor rotor 14 is a substantially cylindrical body, is arranged coaxially with the axis O, and projects rearward from the rotating flange member 15. The motor rotor 14 is separated from the table plate 11 and the table spindle 12. The outer peripheral surface of the motor rotor 14 faces the motor stator 27 of the motor 13 through a small radial gap. The motor 13 will be described later. The inner peripheral surface of the motor rotor 14 is located away from the outer peripheral surface of the table main shaft 12, and a clamp member 26 described below is arranged in an annular space formed between the motor rotor 14 and the table main shaft 12. Thus, the motor rotor 14 is attached and fixed to the table plate 11 via the rotary flange member 15 and the table main shaft 12 in order, and rotates together with the table plate 11.

  The table plate 11, the table main shaft 12, the motor rotor 14, and the rotary flange member 15 rotate together, and are also referred to as a rotary table.

  The shaft portion 24 is passed through the center hole of the table main shaft 12 from behind. The shaft portion 24 has a cylindrical shape, and the rear end of the shaft portion 24 projects from the rear end of the table main shaft 12. A flange 25 is formed at the rear end of the shaft 24. The outer peripheral edge of the flange portion 25 is attached and fixed to the inner peripheral edge of the frame rear end member 23 by a coupling means such as a bolt 25b.

  The non-rotating frame rear end member 23 is an annular disc, and the rear end of the rotating table main shaft 12 and the non-rotating shaft portion 24 are passed through the center hole. The outer peripheral edge of the frame rear end member 23 is attached and fixed to the rear end of the frame support member 22 by a connecting means such as a bolt, and is supported by the frame support member 22. An outer peripheral edge of the clamp member 26 is interposed between the outer peripheral edges of the frame support member 22 and the frame rear end member 23. The clamp member 26 is attached and fixed to the frame support member 22 and is supported by the frame support member 22.

  The front end of the frame support member 22 is attached and fixed to the outer peripheral edge of the frame front end member 21 by coupling means such as bolts. The non-rotating frame front end member 21 is annular, and outer races of bearings 16 and 17 are fixed to the inner peripheral surface of the frame front end member 21. The bearings 16 and 17 are arranged on the front end side and the rear end side in the axis O direction, respectively.

  The table main shaft 12 is passed through the center hole of the frame front end member 21. Inner races of bearings 16 and 17 are fixed to the outer peripheral surface of the front end region of the table spindle 12. The bearings 16 and 17 are radial rolling bearings having a plurality of rolling elements between an outer race and an inner race. The frame front end member 21, the frame support member 22, and the frame rear end member 23 constitute a frame portion.

  A motor stator 27 is attached and fixed to the center region of the frame support member 22 in the direction of the axis O by a coupling means such as a bolt 22b. The motor stator 27 is a substantially cylindrical body and is arranged coaxially with the axis O. The motor stator 27 is disposed between the front frame front end member 21 on the front side and the frame rear end member 23 on the rear side.

  The motor 13 is built in the center of the rotary table device 10 in the direction of the axis O, and is supplied with electric power from outside the rotary table device 10 to rotate the table plate 11. The motor 13 directly drives the table main shaft 12 without passing through a speed reduction mechanism including gears such as a worm gear. For this reason, the rotary table device 10 is also referred to as a motor direct drive type rotary table device. The motor 13 is called a DD motor (Direct Drive Motor). Here, regarding the position in the axis O direction, the position in the axis O direction of the motor 13 does not overlap with the position in the axis O direction of the bearings 16 and 17. Regarding the radial position, the radial position of the motor 13 and the radial positions of the bearings 16 and 17 overlap.

  The clamp member 26 has a cylindrical portion and a flange portion. The flange portion connects with the rear end of the cylindrical portion. The outer peripheral edge of the flange portion is fixed to the frame support member 22 by a coupling means such as a bolt 26b. The cylindrical portion is interposed between the table main shaft on the inner diameter side and the motor rotor 14 on the outer diameter side, the inner peripheral surface of the cylindrical portion faces the outer peripheral surface of the table main shaft 12 through a slight radial gap, and the outer peripheral surface of the cylindrical portion Faces the inner peripheral surface of the motor rotor 14 via a slight radial gap. The clamp member 26 includes an inner hydraulic chamber 26m along the inner peripheral surface and an outer hydraulic chamber 26n along the outer peripheral surface.

  When hydraulic pressure is supplied from a hydraulic pressure source (not shown) to the inner hydraulic chamber 26m and the outer hydraulic chamber 26n via the passage 26p, the inner hydraulic chamber 26m and the outer hydraulic chamber 26n are enlarged and the clamp member 26 is expanded. The inner peripheral surface and the outer peripheral surface are radially expanded, and come into contact with the motor rotor 14 and the table main shaft 12. As a result, the turntable cannot be rotated.

  The frame portion (the frame front end member 21, the frame support member 22, and the frame rear end member 23) forms an apparatus main body together with the shaft portion 24, the flange portion 25, the clamp member 26, and the motor stator 27.

  The rotary table device 10 further includes a rotary joint 18. The rotary joint 18 includes a rotating joint sleeve 19 and a non-rotating shaft portion 24, and is arranged at a front portion of the rotary table device 10 in the direction of the axis O. The joint sleeve 19 is passed through the center hole of the table plate 11 and the center hole of the table main shaft 12, and the front end of the joint sleeve 19 is attached and fixed to the table plate 11 by coupling means such as bolts 19b. A center hole is formed in the joint sleeve 19. The front end region of the shaft portion 24 is inserted into a central hole (hollow portion) of the joint sleeve 19 having a hollow shape. The outer peripheral surface of the front end region of the shaft portion 24 faces the inner peripheral surface of the joint sleeve 19. On the other hand, the rear end region of the shaft portion 24 projects rearward from the center hole (hollow portion) of the joint sleeve 19.

  A plurality of first passages 31, 31, 31,... Are formed inside the thickness of the shaft portion 24. Each of the first passages 31 extends in the direction of the axis O at one end, and is turned in the direction perpendicular to the axis O, and one end of each of the passages 31 is connected to the outer peripheral surface of the shaft portion 24. The other end is referred to as an apparatus body side port. The other end of each first passage 31 extends to the rear end of the shaft portion 24, or changes its direction at the rear end of the shaft portion 24, further extends in the outer diameter direction, and is formed inside the thick portion of the flange portion 25. You. The other end of each of the first passages 31 is connected to the outer peripheral surface of the flange portion 25. Further, some of the first passages 31 are turned forward at the other end, specifically, at the outer peripheral edge of the flange 25, and the other end 31 d is connected to the front end face of the flange 25. Since the first passages 31, 31, 31,... Are arranged at intervals in a direction perpendicular to the axis O, they are independent of each other (not connected to each other).

  A first passage 31c is formed inside the thickness of the frame rear end member 23. The first passage 31 c extends in the radial direction from the outer peripheral edge of the frame rear end member 23, changes its direction at one end side, and extends rearward. Connect to end 31d. The other end of the first passage 31c is connected to the outer peripheral surface of the frame rear end member 23.

  A plurality of table passages 32 are formed inside the joint sleeve 19. Each table passage 32 extends in the direction of the axis O, and one end of the table passage 32 is connected to the front end of the joint sleeve 19. Such one end is called a table side port. Since the table passages 32, 32, 32,... Are arranged at intervals in the circumferential direction of the joint sleeve 19, they are independent of each other (not connected to each other).

  The other end of each table passage 32 extends while changing its direction in the radial direction, and is connected to the inner peripheral surface of the joint sleeve 19. The position of the other end of one table passage 32 in the direction of the axis O coincides with the position of one end of the one first passage 31 in the direction of the axis O.

  The apparatus body side port of each first passage 31 and the table side port of each table passage 32 form a pair and are connected to each other. Each pair is arranged at intervals in the direction of the axis O, and is arranged neatly so as not to cross each other. A circumferential groove 33 is formed in one of these ports. Accordingly, the table-side port is connected to the apparatus body-side port via the circumferential groove 33 regardless of the circumferential position of the table-side port.

  Fluid flows through each of the first passages 31, each of the circumferential grooves 33, and each of the table passages 32 in this order. Thus, the fluid can be supplied from the apparatus main body of the rotary table apparatus 10 to the front surface 11c serving as the table surface. Each table passage 32 constitutes, for example, a hydraulic circuit for clamping / amplifying a work (not shown) on the front surface 11c.

  Next, the cooling structure of the present embodiment will be described.

  The inner peripheral surface of the rear end region of the table main shaft 12 and the outer peripheral surface of the rear end region of the shaft portion 24 define a shaft gap G1 opened in the radial direction. The shaft gap G1 extends from the rear end of the joint sleeve 19 to the flange portion 25. An annular sealing member 23 f is interposed between the outer peripheral surface of the rear end portion of the table main shaft 12 and the inner peripheral surface of the rear end member 23 of the frame.

  The central portion 23e of the rear surface of the frame rear end member 23 comes into surface contact with the front end surface 25c of the flange portion 25 by tightening the bolt 25b. The rear end of the shaft gap G1 is sealed by the surface contact structure and the above-described sealing material 23f.

  The outer peripheral surface of the joint sleeve 19 and the inner peripheral surface of the front end region of the table spindle 12 define a sleeve gap G2 that opens in the radial direction. The sleeve gap G2 extends from the central region of the joint sleeve 19 to the rear end, and is connected to the shaft gap G1 at the rear end. In this way, a radially open gap is defined between the rotary table main shaft 12 and the non-rotating apparatus main body. At least one of the shaft gap G1 and the sleeve gap G2 may be an annular gap.

  In front of the sleeve gap G2, the outer peripheral surface of the front end of the joint sleeve 19 and the inner peripheral surface of the central portion of the table plate body 11 are fitted, and an annular sealing material 19f is interposed between the inner peripheral surface and the outer peripheral surface of the fitting portion. .

  The center 11e of the rear surface of the table plate 11 comes into surface contact with an annular surface 12c formed at the front end of the table spindle 12 by tightening the bolt 11b. The front end of the sleeve gap G2 is sealed by the surface contact structure and the above-described sealing material 19f.

  One of the plurality of first passages 31 serves as a cooling passage of the rotary table device 10 and is connected to the cooling passage 34 by the rotary joint 18. The cooling passage 34 is a through hole extending from the inner peripheral surface to the outer peripheral surface of the joint sleeve 19, and communicates the table side port with the sleeve gap G2.

  In the present embodiment, two cooling passages 34 are provided at intervals in the circumferential direction. The first passage 31 provided for the cooling passage of the present embodiment is branched at one end in a direction perpendicular to the axis O. The device body side port at each of the branched ends is connected to the table side port of each cooling passage 34. In this case, the port of the cooling passage is disposed on the front end side with respect to the other port for supplying the fluid to the front surface 11c serving as the table surface. Thereby, the coolant is supplied to the front end of the rotary table device 10.

  A second passage 35 is formed in the flange 25. One end of the second passage 35 is connected to the rear end of the shaft gap G1. The other end of the second passage 35 is connected to the outer peripheral surface of the flange 25. As a modified example (not shown), the second passage 35 may be formed in the frame rear end member 23 instead of the flange portion 25.

  The first passage 31c, the first passage 31, the circumferential groove 33, the cooling passage 34, the sleeve clearance G2, the shaft clearance G1, and the second passage 35 are connected in series in this order to form a series of passages. And the coolant flows in this order as shown by the arrows in FIG. Alternatively, the coolant may flow in reverse order.

  Although not shown, a coolant supply source is provided outside the rotary table device 10. The coolant supply source includes a radiator that lowers the temperature of the coolant recovered from the shaft gap G1, and a pump that sucks and discharges the coolant. The other end of the second passage 35, the pump, the radiator, and the other end of the first passage 31c may be sequentially connected to form a cooling circuit. This allows the coolant to circulate and flow through the sleeve gap G2 and the shaft gap G1.

  By the way, according to the present embodiment, the outer peripheral surface of the shaft portion 24 and the inner peripheral surface of the center hole of the table main shaft 12 open in the radial direction to define the shaft gap G1 extending in the axial direction. A first passage 31 is provided in the shaft portion 24 of the device main body of the rotary table device 10, and one end of the first passage 31 communicates with the shaft gap G1 via the cooling passage 34 and the sleeve gap G2, and the other end thereof is connected to the device main body. To the outside of the A second passage 35 is provided in the flange portion 25 of the main body of the rotary table device 10. One end of the second passage 35 communicates with the shaft gap G1, and the other end communicates with the outside of the apparatus main body. The first passage 31 serves as a coolant supply passage, and the second passage 35 serves as a coolant recovery passage. The coolant flows through the shaft gap G1.

  Thus, in the rotary table device 10 in which the rotary table is directly driven by the motor 13, the cooling liquid flows through the shaft gap G1 to actively cool the inner peripheral surface of the table spindle 12. Therefore, even when the direct drive type motor 13 is operated at a high rotation speed, it is possible to prevent the inside of the rotary table device 10 from becoming hot.

  Further, the first passage 31 of the present embodiment is branched into two at the front end of the shaft portion 24. By providing a plurality of the first passages 31 in this manner, the flow rate of the coolant flowing through the sleeve gap G2 can be increased, and the inside of the rotary table device 10 can be efficiently cooled.

  The present embodiment is also directed to a joint sleeve 19 which is a cylindrical member provided on the table plate 11 and which is disposed in the center hole of the table main shaft 12 and which passes through the front end region of the shaft portion 24, and a table-side port provided on the joint sleeve 19. And a rotary joint 18 provided in the distal end region of the shaft portion 24 and having a device body side port facing the table side port, and for transferring fluid between the device body side port and the table side port.

  In particular, the outer peripheral surface of the joint sleeve 19 and the inner peripheral surface of the center hole of the table main shaft 12 define a sleeve gap G2. The passage 31 is connected to the sleeve gap G2 via the rotary joint 18. Thereby, the periphery of the rotary joint 18 can be cooled.

  Further, the motor rotor 14 of the present embodiment is attached and fixed to the outer peripheral surface of the table main shaft 12 by the rotary flange member 15, the motor stator 27 faces the motor rotor 14 in the radial direction, and the position of the bearings 16 and 17 in the axis O direction with respect to the axis O is , Between the position of the table plate 11 in the direction of the axis O and the position of the motor 13 in the direction of the axis O. Thereby, the arrangement of the motor 13 can be made closer to the table main shaft 12 to improve the cooling effect.

  Next, another embodiment of the present invention will be described.

  FIG. 2 is a schematic longitudinal sectional view showing another embodiment of the present invention. In other embodiments, the same components as those in the above-described embodiments are denoted by the same reference numerals, and description thereof will be omitted. Different configurations will be described below. Another embodiment has the first passage 31 and the second passage 35 described above as a first system coolant circuit, and a coolant supply passage 41, a motor stator cooling passage 43, a bearing as a second system coolant circuit. It further includes a cooling passage 44, a sliding contact surface cooling passage 45, and a coolant recovery passage 47.

  One end of the first passage 31 is connected to the outside of the frame supporting member 22, and the other end of the first passage 31 is connected to one end of the second passage 35 inside the cylindrical table main shaft 12. The other end of the second passage 35 is connected to the outside of the frame support member 22. The cooling liquid is supplied to the table main shaft 12 from outside the frame support member 22 via the first passage 31, cools the table main shaft 12, and is collected outside the frame support member 22 via the second passage 35.

  The coolant supply passage 41 and the coolant recovery passage 47 are formed inside the thickness of the frame support member 22. One end of the coolant supply passage 41 is connected to a coolant supply source (not shown), and the other end on the opposite side is connected to one end of the motor stator cooling passage 43 at a connection point 42.

  The motor stator cooling passage 43 is formed inside the thickness of the frame support member 22, and at least a part thereof is arranged along the motor stator 27. In the embodiment shown in FIG. 2, the motor stator cooling passage 43 is arranged outside the motor stator 27 on the outer diameter side. The other end of the motor stator cooling passage 43 is connected to one end of a coolant recovery passage 47 at a connection point 46. The other end of the coolant recovery passage 47 is connected to a coolant supply source (not shown).

  The coolant supply passage 41, the connection point 42, the motor stator cooling passage 43, the connection point 46, the coolant recovery passage 47, and a coolant supply source (not shown) constitute a cooling circuit, and the coolant circulates and flows. Thereby, the motor stator 27 is cooled.

  The rear surface 11d of the table plate 11 is in sliding contact with the front surface 21c of the frame front end member 21. The sliding surface cooling passage 45 is formed inside the thickness of the frame front end member 21. At least a part of the sliding contact surface cooling passage 45 extends along the front surface 21c which is the sliding contact surface. One end of the sliding surface cooling passage 45 is connected to the other end of the coolant supply passage 41 at a connection point 42. The other end of the sliding surface cooling passage 45 is connected to one end of the bearing cooling passage 44.

  The bearing cooling passage 44 is formed inside the thickness of the frame front end member 21. At least a part of the bearing cooling passage 44 extends along the inner peripheral surface of the frame front end member 21. The inner peripheral surface of the frame front end member 21 contacts the outer races of the bearings 16 and 17. The other end of the bearing cooling passage 44 is connected to one end of a coolant recovery passage 47 at a connection point 46.

  The coolant supply passage 41, the connection point 42, the sliding contact surface cooling passage 45, the bearing cooling passage 44, the connection point 46, the coolant collection passage 47, and a coolant supply source (not shown) constitute a cooling circuit, and the coolant circulates. Flowing. Thereby, the front surface 21c, which is the sliding contact surface, and the bearings 16 and 17 are cooled. Note that the motor stator cooling passage 43, the bearing cooling passage 44, and the sliding contact surface cooling passage 45 may be arranged all around the axis O.

  In the rotary table device 10 shown in FIG. 2, the device body has a sliding contact surface cooling passage 45 arranged along the front surface 21 c of the frame front end member 21, a bearing cooling passage 44 arranged along the bearings 16 and 17, and a motor. It further has a motor stator cooling passage 43 arranged along the stator 27, and a coolant flows through the sliding contact surface cooling passage 45, the bearing cooling passage 44, and the motor stator cooling passage 43.

  According to another embodiment, the front surface 21c that generates heat by sliding contact with the rear outer diameter portion 11d, the bearings 16, 17 and the DD motor that rotate at high speed can be efficiently cooled, and the temperature inside the rotary table device 10 can be prevented from rising. .

  Although the embodiments of the present invention have been described 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. For example, a part of the configuration may be extracted from the first embodiment described above, another part of the configuration may be extracted from the other embodiment described above, and the extracted configurations may be combined.

  The invention is advantageously used in machine tools.

10 rotary table device, 11 table plate,
11c front, 12 table spindle, 13 motor,
14 motor rotor, 15 rotating flange member,
16, 17 bearing, 18 rotary joint,
19 joint sleeve, 21 frame front end member (frame),
22 frame support members (frames),
23 frame rear end member (frame), 24 shaft part,
25 flange part, 26 clamp member,
27 motor stator, 31, 31c first passage,
32 table passage, 33 circumferential groove, 34 cooling passage,
35 second passage, G1 shaft clearance, G2 sleeve clearance,
O Table axis.

Claims (6)

A table plate having a front surface and a rear surface,
A table spindle having a center hole and fixed to a rear surface of the table plate at a front end,
A front end region having a shaft portion inserted through the center hole, a flange portion formed at a rear end of the shaft portion, and a frame fixed to the flange portion, wherein the frame is provided with a bearing through the table spindle; A device body rotatably supporting the
An apparatus including a pair of a motor stator and a motor rotor provided on the table main shaft and the frame, respectively.
An outer peripheral surface of the shaft portion and an inner peripheral surface of the center hole of the table main shaft define a shaft gap that opens in a radial direction and extends in an axial direction,
A first passage provided in the shaft portion so as to extend from a rear end of the shaft portion to the front end region , one end of which communicates with the shaft gap, and the other end of which communicates with the outside of the device main body; A second passage provided at a rear end of the shaft portion and / or the flange portion and having one end communicating with the shaft gap and the other end communicating with the outside of the apparatus main body;
A rotary table device, wherein one of the first passage and the second passage is used as a coolant supply passage, and the other is used as a coolant collection passage, and the coolant flows through the gap between the shafts. The rotary table device according to claim 1, wherein the rotary table device has a plurality of the first passages and / or the second passages. A joint member which is a hollow member provided in the table plate body and which is disposed in the center hole of the table main shaft and which passes the shaft portion through a hollow portion; a table-side port provided in the joint sleeve; and a joint member provided in the shaft portion 3. The rotary table according to claim 1, further comprising a rotary joint having a device main body side port facing the table side port and transferring fluid between the device main body side port and the table side port. 4. apparatus. The outer peripheral surface of the joint sleeve and the inner peripheral surface of the center hole of the table spindle define a sleeve gap,
The joint sleeve is provided with a cooling passage extending from the table side port to the sleeve gap,
The first passage is connected to the cooling passage via the rotary joint,
The rotary table device according to claim 3, wherein the sleeve gap is connected to the shaft gap. The motor rotor is provided on an outer peripheral surface of the table main shaft,
The motor stator radially faces the motor rotor,
The rotary table device according to any one of claims 1 to 4, wherein, with respect to the table axis, the axial position of the bearing is between the axial position of the table plate and the axial position of the motor stator. The first passage and the second passage are a first system coolant circuit,
The device main body further includes a second system coolant circuit provided in parallel with the first system coolant circuit,
The rear surface of the table plate is in sliding contact with the front surface of the frame,
The second system coolant circuit includes a sliding contact surface cooling passage arranged along the front surface of the frame, a bearing cooling passage arranged along the bearing, and a motor arranged along the motor stator. includes a stator cooling passages, these sliding surfaces cooling passage, the bearing cooling passages, and a motor stator flowing cooling passages to the coolant, the rotary table apparatus according to claim 1.

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