JP2018144211A - Gear processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear processing device capable of stably operating a bearing for rotating a tool without failure.SOLUTION: A gear processing device includes: an annular tool unit for processing a gear to be processed; and a workpiece support unit for rotatably supporting the gear to be processed, and relatively approaching/separating from the tool unit. The tool unit includes: an annular housing; an annular bearing mounted on the inner peripheral surface of the housing; an annular tool support body rotatably arranged to the inner peripheral side of the housing via the bearing; and a tool with an inner gear shape mounted to the inner peripheral side of the tool support body and engaged with the gear to be processed. In the housing, an annular first passage in which a cooling medium passes is formed at a position corresponding to the bearing.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a gear machining apparatus.

  Conventionally, honing, for example, is known as a finishing process for gears. In these processes, finishing is performed by rotating in a state where the gear to be processed and the gear for the grindstone are meshed with each other.

  For example, Patent Document 1 describes a gear machining apparatus that performs honing. In this apparatus, a gear to be processed is supported by being sandwiched from both ends in the axial direction by a pair of fixing tools, and this gear meshes with an annular tool having an internal gear-like tool. In this state, the gear is finished by rotating the tool and the gear together.

JP2013-18080A

  By the way, in an apparatus as described in the said patent document 1, the cooling medium, such as a coolant, is supplied to the meshing position of a tool and a gearwheel, and this reduces the heat | fever which generate | occur | produces by a process. At that time, along with the cooling of the tool, the inner ring side of the bearing that supports the rotation of the tool is also cooled. However, since the outer ring side of the bearing is not cooled, the present inventor has found a problem that a temperature difference occurs between the inner ring side and the outer ring side of the bearing, causing a malfunction in the operation of the bearing. In particular, when the bearing operates at a high speed, such a problem is remarkable. The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a gear machining apparatus that can stably operate a bearing for rotating a tool without any trouble.

  A gear machining apparatus according to the present invention includes an annular tool unit for machining a workpiece gear, and a workpiece support unit that rotatably supports the workpiece gear and relatively close to and away from the tool unit, The tool unit includes an annular housing, an annular bearing attached to the inner peripheral surface of the housing, an annular tool support disposed rotatably on the inner peripheral side of the housing via the bearing, An internal gear-shaped tool that is attached to the inner peripheral side of the tool support and meshes with the gear to be processed, and in the housing, at a position corresponding to the bearing, an annular first flow through which the cooling medium passes is provided. A road is formed.

  According to this structure, since the 1st flow path through which a cooling medium passes is formed in the radial direction outer side of a bearing in a housing, the radial direction outer side of a bearing can be cooled. On the other hand, the radially inner side of the bearing is cooled by a cooling medium that is generally supplied to a meshing position between the tool and the gear. Therefore, since the bearing can be cooled from the inside and outside in the radial direction, the temperature difference between the inside and outside in the radial direction in the bearing can be reduced. As a result, since the bearing can be stably operated, the tool can be stably rotated with respect to the housing.

  In the gear processing apparatus, the position where the first flow path is formed is not particularly limited. For example, the first flow path is formed radially outward of the bearing and spaced from the bearing. Can do.

  In each gear processing device, the tool support includes: an annular stator portion attached to an inner peripheral side of the housing; and a rotor portion attached to the outer periphery of the support and disposed to face the stator. Drive means for rotating the housing may be further provided, and an annular second flow path through which a cooling medium passes may be formed at a position corresponding to the stator portion in the housing.

  According to this configuration, since the second flow path through which the cooling medium passes is formed at a position corresponding to the stator in the housing, the stator can be cooled. As a result, it is possible to stably operate the stator and prevent malfunctions.

  The gear machining apparatus may further include a communication path that communicates the first flow path and the second flow path.

  According to this structure, since the 1st flow path which cools a bearing and the 2nd flow path which cools a stator are connecting, the cooling medium supplied to one channel | path can be flowed also to the other channel | path. Therefore, the supply and discharge of the cooling medium can be performed at one place, so that the structure can be simplified.

  In each of the gear machining apparatuses, an annular third passage through which lubricating oil passes can be formed at a position corresponding to the bearing in the tool unit, and the third flow path is formed on the bearing by the lubrication. At least one supply path for supplying oil may be provided.

  According to this configuration, in the tool unit, the annular third flow path through which the lubricating oil passes is formed at a position corresponding to the bearing, and the lubricating oil is supplied from here to the bearing, so the smooth operation of the bearing Can be maintained.

  As described above, the bearing for rotating the tool can be stably operated without any trouble.

It is a perspective view of the gear processing apparatus which concerns on one Embodiment of this invention. It is a front view of FIG. It is a top view of FIG. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is the EE sectional view taken on the line of FIG. FIG. 9 is a sectional view taken along line FF in FIG. 8. It is the HH sectional view taken on the line of FIG. It is the GG sectional view taken on the line of FIG. It is an expanded sectional view of the housing in FIG. It is the II sectional view taken on the line of FIG. It is the JJ sectional view taken on the line of FIG. It is the KK sectional view taken on the line of FIG. It is the LL sectional view taken on the line of FIG.

  Hereinafter, an embodiment of a gear machining apparatus according to the present invention will be described with reference to the drawings. 1, 2, and 3 are a perspective view, a front view, and a plan view of a gear machining apparatus according to the present embodiment, respectively. In the following description, the left and right in FIG. 1 are referred to as the X-axis direction or the left-right direction, the top and bottom in FIG. I will do it. However, the present invention is not limited to these directions.

  As shown in FIGS. 1 to 3, the gear machining apparatus according to this embodiment includes a tool unit 2 and a workpiece support unit 3 arranged on a base 1. The tool unit 2 has an annular housing 21 that is formed in an annular shape and to which the tool 4 is fixed. The tool unit 2 is arranged so that its axial direction is substantially in the X-axis direction, and meshes with a gear that is a workpiece W. It is like that. The workpiece support unit 3 includes a headstock 31 and a tailstock 32 that sandwich the workpiece W, and these are disposed on both sides of the base 1 in the X-axis direction with the tool unit 2 interposed therebetween. .

  First, the workpiece support unit 3 will be described. As shown in FIGS. 1 to 3, the work support unit 3 includes the headstock 31 and the tailstock 32 described above, which are close to and away from each other in the X-axis direction and rotate the work W. It is designed to be held freely.

  Next, the head stock 31 will be described with reference to FIGS. 4 and 5 as well. 4 is a cross-sectional view taken along line AA in FIG. 3, and FIG. 5 is a cross-sectional view taken along line BB in FIG. As shown in FIGS. 4 and 5, the head stock 31 is arranged on a first support frame 311 arranged on the left side of the base 1 with the tool unit interposed therebetween. The first support frame 311 is formed in a triangular shape in a side view, and a pair of rails 312 extending in the Y-axis direction are attached to both ends in the X-axis direction. That is, these rails 312 are arranged on the inclined surface 310 that descends as it goes forward. The inclination angles of these rails 312 are not particularly limited, but can be, for example, 10 to 45 degrees (about 30 degrees in the present embodiment). On the first support frame 311, a first support block 313 that is supported by both rails 312 and is movable while being inclined in the Y-axis direction is disposed. A nut 314 is connected to the lower surface of the first support block 313, and a ball screw 315 extending parallel to the rail 312 is screwed to the nut 314. The ball screw 315 is supported by a first support frame 311 so as to be rotatable about an axis, and a motor 316 supported by the first support frame 311 is connected to an upper end portion thereof. Therefore, when the ball screw 315 is rotated by the motor 316, the first support block 313 moves in the Y-axis direction along the inclined surface 310 of the first support frame 311.

  A pair of rails 317 extending in parallel with the X-axis direction are arranged on the upper surface of the first support block 313, and the headstock 31 can move in the X-axis direction along these rails. A nut 318 is connected to the lower surface of the head stock 31, and a ball screw 319 extending parallel to the rail 317 is screwed to the nut 318. The ball screw 319 is supported by a first support block 313 so as to be rotatable about an axis, and a motor 3190 supported by the first support block 313 is connected to a left end portion thereof. Therefore, when the ball screw 319 is rotated by the motor 3190, the spindle stock 31 moves on the first support block 313 in the X-axis direction.

  A shaft member 3101 that protrudes in the X direction and supports the workpiece W is rotatably provided at the tip of the head stock 31 and is driven to rotate by a built-in motor (not shown).

  Next, the tailstock 32 will be described with reference to FIGS. 6 is a cross-sectional view taken along line CC in FIG. 3, and FIG. 7 is a cross-sectional view taken along line DD in FIG. As shown in FIGS. 6 and 7, the tailstock 32 is configured in the same manner as the headstock 31. That is, the tailstock 32 is arranged on the second support frame 321 arranged on the right side on the base 1 with the tool unit 2 interposed therebetween. The second support frame 321 is formed in a triangular shape in a side view, and a pair of rails 322 extending in the Y-axis direction are attached to both ends in the X-axis direction. That is, these rails 322 are disposed on the inclined surface 320 that is processed as it goes forward. The inclination angle of the rail 322 is the same as the inclination angle of the headstock 31. On the second support frame 321, a second support block 323 that is supported by both rails 322 and is movable while being inclined in the Y-axis direction is disposed. A nut 324 is connected to the lower surface of the second support block 323, and a ball screw 325 extending in parallel with the rail 322 is screwed to the nut 324. The ball screw 325 is supported by a second support frame 321 so as to be rotatable about an axis, and a motor 326 supported by the second support frame 321 is connected to an upper end portion of the ball screw 325. Therefore, when the ball screw 325 is rotated by the motor 326, the second support block 323 moves in the Y-axis direction along the inclined surface 320 of the second support frame 321.

  A pair of rails 327 extending in parallel with the X-axis direction are arranged on the upper surface of the second support block 323, and the tailstock 32 is movable along the rails 327 in the X-axis direction. A nut 328 is connected to the lower surface of the tailstock 32, and a ball screw 329 extending parallel to the rail 327 is screwed to the nut 328. The ball screw 329 is supported by a second support block 323 so as to be rotatable about an axis, and a motor 3290 supported by the second support block 323 is connected to the right end portion thereof. Therefore, when the ball screw 329 is rotated by the motor 3290, the tailstock 32 moves on the second support block 323 in the X-axis direction.

  Further, a shaft member 3201 that supports the workpiece W is rotatably provided at the tip of the tailstock 32 so that the workpiece W is sandwiched between the shaft member 3101 of the headstock 31. . The headstock 31 and the tailstock 32 are controlled to move integrally in the X-axis direction and the Y-axis direction, and both move in the X-axis direction and the Y-axis direction while holding the work W. Then, the workpiece W is moved closer to and away from the tool of the tool unit 2.

  Next, the tool unit 2 will be described in detail with reference to FIGS. 8 is a cross-sectional view taken along line EE in FIG. 3, and FIG. 9 is a cross-sectional view taken along line FF in FIG. The housing 21 of the tool unit 2 is formed in an annular shape, and can be moved in the Y-axis direction in order to form a crossing angle on the workpiece W or to provide crowning, and is a rotating shaft that is inclined with respect to the Y-axis in the YZ plane. It can rotate around S. Therefore, the tool unit 2 includes a support 23 that is disposed on the base 1 and supports the housing 21 described above. Moreover, the housing 21 is rotatably supported by the support body 23 at both ends of the rotation shaft S described above. That is, the first shaft end member 41 is attached to the front end side and the second shaft end member 42 is attached to the rear end side of both ends of the rotation shaft S of the housing 21. The first and second shaft end members 41 and 42 are supported by the support body 23. Hereinafter, the support 23 will be described in detail.

  As shown in FIG. 8, the support body 23 is provided at a base portion 231 that can move on the base 1 in the Y-axis direction and a front end portion of the base portion 231, and supports the first shaft end member 41 of the housing 21. The first support portion 232 and a second support portion 233 provided at the rear end portion of the base portion 231 and supporting the second shaft end member 42 of the housing 21 are provided. In the side view, the base portion 231 is inclined upward and has a front end surface 2311 inclined upward, a central surface 2312 formed in an arc shape continuous with the front end surface 2311, and a rear end of the central surface 2312. The rear end surface 2313 is arranged, and these surfaces are arranged in this order from the front to the rear. The inclination angles of the front end surface 2311 and the rear end surface 2313 are the same as those of the workpiece support unit 3. In this configuration, the rear end surface 2313 is located higher than the front end surface 2311, the first support portion 232 is attached to the front end surface 2311, and the second support portion 233 is attached to the rear end surface 2313.

  The first shaft end member 41 of the housing 21 is rotatably supported by the first support portion 232, and the second shaft end member 42 is rotatably supported by the second support portion 233. Thereby, the housing 21 can be rotated around the rotation axis S extending at the inclination angle. The arc shape of the central surface 2312 is formed along the outer peripheral surface of the housing 21. Further, as shown in FIG. 9, a coolant discharge groove 2315 is formed at the lower end portion of the center surface 2312 so that the coolant flowing out from the housing 21 is discharged.

  Next, the movement of the support in the Y-axis direction will be described. As shown in FIG. 9, a pair of rails 11 extending in parallel to the Y-axis direction are disposed on the base 1, and a support body 23 is movably disposed on these rails 11. A nut 12 is attached to the lower surface of the support 23, and a ball screw 13 is screwed onto the nut 12. The ball screw 13 is rotatably supported by the base 1 at both ends in the Y-axis direction, and a motor 14 is connected to the rear end of the ball screw 13. Therefore, when the motor 14 is driven and the ball screw 13 rotates, the support 23 moves in the Y-axis direction together with the housing 21.

  Next, the rotation of the housing 21 around the rotation axis will be described with reference to FIGS. 10 is a cross-sectional view taken along line HH in FIG. 8, and FIG. 11 is a cross-sectional view taken along line GG in FIG. As shown in FIG. 10, the second support portion 233 of the support body 23 has a rectangular parallelepiped housing 2331, and the first housing portion 2333 partitioned by a partition plate 2332 is provided in the housing 2331. And a second accommodating portion 2334 are provided. And in the 1st accommodating part 2333, the 2nd axial end member 42 attached to the housing 21 is accommodated rotatably. The second shaft end member 42 is formed in a cylindrical shape, and an external gear-like engagement portion 421 is attached to the outer peripheral surface thereof. On the other hand, the internal space of the second shaft end member 42 is open to the outside on the distal end side, and the distal end thereof faces a communication hole 2335 formed in the partition plate 2332 of the housing 2331. Cables 71 and 72 arranged in the second housing portion 2334 of the housing 2331 extend to the housing 21 through a central space 420 that penetrates the second shaft end member 42. In addition, air is injected into the second housing portion 2334 from the outside by the pipe member 2336, and this air is fed from the second housing portion 2334 through the partition plate 2332 to the central space 420 of the second shaft end member 42. And is further supplied into the housing 21 from here. This point will be described later.

  As shown in FIG. 11, a screw member 2337 that meshes with an engagement portion 421 attached to the second shaft end member 42 is rotatably attached to the first housing portion 2333. And the upper end part of this screw member 2337 protrudes from the housing | casing 2331, and the motor 2338 is attached to this protrusion part. Accordingly, the screw member 2337 is rotated by the drive of the motor 2338, whereby the second shaft end member 42 is rotated around the rotation axis together with the housing 21.

  Next, a tool mounting structure and the like in the tool unit 2 including the housing will be described with reference to FIGS. 12 is an enlarged sectional view of the housing in FIG. 8, FIG. 13 is a sectional view taken along the line II in FIG. 12, FIG. 14 is a sectional view taken along the line JJ in FIG. 16 is a cross-sectional view taken along line LL in FIG.

  As shown in FIGS. 12 to 16, the tool unit 2 includes an annular housing 21 as a whole and a tool support 25 that is rotatably provided on the inner peripheral side of the housing 21 via a pair of bearings 241 and 242. And an internal gear-shaped tool 4 attached to the inner peripheral surface of the tool support 25. Further, the tool unit 2 is provided with a motor (driving means) 5 for rotating the tool support 25 with respect to the housing 21. Further, the tool unit 2 is provided with a detector 6 for detecting the rotational angle position of the tool support 25. Hereinafter, each member will be described in detail.

  The housing 21 includes an annular housing body 211, an annular cooling member 212 provided at the left end of the housing body 211 in the axial direction, an annular first end member 213 provided at the left end of the cooling member 212, And an annular second end member 214 provided at the right end of the housing body 211 in the axial direction.

  The housing main body 211 has a central portion 2110 located near the center in the axial direction, a first portion 2111 bulging radially outward on the left end side in the axial direction, and a second portion located on the right end side in the axial direction. Part 2112 and these are integrally formed. The inner diameter of the central portion 2110 is the smallest, and the pair of bearings 241 and 242 described above are attached to the inner peripheral surface of the central portion 2110 at a predetermined interval in the axial direction. Each of the bearings 241 and 242 is a known one having an outer ring, an inner ring, and rolling elements (balls or rollers) held therebetween. Since the first part 2111 bulges outward in the radial direction, the outer diameter and the inner diameter are larger than the central part 2110. Specifically, the inner peripheral surface of the first part 2111 is located radially outward from the outer peripheral surface of the central part 2110. Thereby, a motor accommodating space 26 in which the motor 5 and the like are accommodated is formed between the inner peripheral surface of the first part 2111 and the tool support 25.

  On the other hand, the outer diameter of the second part 2112 is the same as that of the central part 2110. That is, the outer peripheral surfaces of the central part 2110 and the second part 2112 are continuous. Further, the inner diameter of the second portion 2112 is slightly larger than that of the central portion 2110, thereby detecting that the detector 6 described above is arranged between the inner peripheral surface of the second portion 2112 and the tool support 25. A container storage space 27 is formed.

  As shown in FIG. 16, a cylindrical second shaft end member 42 protruding outward in the radial direction is formed in a portion of the housing 21 that is connected to the above-described second support portion 233. A central space 420 extending in the radial direction is formed in the second shaft end member 42 as described above. Further, the housing main body 211 has a first communication passage 2115 and a second communication passage 2116 extending in the axial direction so as to communicate with the central space 420 and the motor housing space 26 and the detector housing space 27 described above. Is formed.

  Next, the central part 2110 of the housing body 211 will be described. As shown in FIGS. 12 and 13, a first coolant channel (first channel) in which coolant (cooling medium) for cooling the outer peripheral surfaces of the bearings 241 and 242 is supplied inside the central portion 2110. ) 2117 is formed. The first coolant channel 2117 is formed so as to extend in a generally annular shape at the central portion 2110. However, as shown in FIG. 12, the first coolant channel 2117 is formed so as to avoid the portion where the second shaft end member 42 is disposed. It is formed in a letter shape. That is, the first coolant flow path 2117 extends in an annular shape with the vicinity of the upper side of the second shaft end member 42 as one end, and extends to the vicinity of the lower side of the second shaft end member 42 through the first shaft end member 41. ing. As shown in FIG. 13, a supply hole 81 extending in the radial direction is formed at a position corresponding to one end portion of the first coolant channel 2117 in the central portion 2110, and the first coolant flow is provided from the supply hole 81. Coolant is supplied to the passage 2117. In addition, the first coolant channel 2117 is formed in a rectangular cross section so that the axial direction is the longitudinal direction so as to correspond to the outer peripheral surfaces of the pair of bearings 241 and 242.

  The pair of bearings 241 and 242 described above are attached to the inner peripheral surface of the central portion 2110. Hereinafter, the left bearing in the axial direction is referred to as a first bearing 241 and the right bearing is referred to as a second bearing 242. It shall be called. An annular supply member 28 for supplying oil mist is attached between the pair of bearings 241 and 242. Further, as shown in FIGS. 13 to 16, an annular first fixing for fixing the first bearing 241 between the supply member 28 and the left side surface facing the left side in the axial direction in the central portion 2110. A member 401 is attached. The first fixing member 401 extends to the left in the axial direction in the cross section, and an oil mist discharged from the first bearing 241 passes through the inner peripheral side of the first fixing member 401 as will be described later. One discharge path 47 is formed. On the other hand, an annular second fixing member 402 for fixing the second bearing 242 between the supply member 28 is attached to the right side surface facing the right side in the axial direction in the central portion 2110. The second fixing member 402 is formed so as to extend inward in the radial direction in the cross section, but is discharged from the second bearing 242 between the second fixing member 402 and the second bearing 242 as described later. A second discharge path 48 through which the oil mist passes is formed.

  A groove 281 is formed on the outer peripheral surface of the supply member 28 disposed between the bearings 241 and 242, and oil mist as lubricating oil is formed between the groove 281 and the inner peripheral surface of the central portion 2110. An oil mist flow path (third flow path) 280 to be supplied is formed. As shown in FIG. 12, the oil mist channel 280 communicates with a supply path 425 formed in the second shaft end member 42 so as to extend in the radial direction, and is supplied to the supply path 425 from the outside. The oil mist thus made flows into the oil mist flow path 280.

  As shown in FIGS. 13 and 16, the supply member 28 is formed with a plurality of tributaries (supply paths) 283 communicating with the oil mist flow path 280 at a predetermined interval in the circumferential direction. This tributary 283 is formed to extend from the oil mist channel 280 to the bearings 241 and 242 in the axial direction. That is, the oil mist supplied to the oil mist flow path 280 is supplied to the bearings 241 and 242 in each branch 283. The oil mist supplied to the bearings 241 and 242 flows out in the axial direction of the bearings 241 and 242, that is, the first and second discharge paths 47 and 48 described above.

  As shown in FIG. 15, a discharge hole 290 extending in the radial direction is formed in the central portion 2110 near the lowermost end in the vertical direction of the housing body 211. The discharge hole 290 communicates with a lower end passage 291 that extends in the axial direction on the inner peripheral side of the central portion 2110. In addition, a gap is formed between the first bearing 241 and the first fixing member 401 at the lower end of the housing body 211 in the vertical direction, and the oil mist that has passed through the first discharge path 47 passes through this gap. It passes through and flows into the lower end passage 291 (see arrow). Similarly, a gap is also formed between the second bearing 242 and the second fixing member 402 so that the oil mist that has passed through the second discharge passage 48 flows into the lower end passage 291 through this gap. It has become. The oil mist that has flowed into the lower end passage 291 is discharged to the outside of the housing 21 through the discharge hole 290. This oil mist is discharged from the discharge groove of the support 23 as shown in FIG. 2315 is discharged.

  Next, the first portion 2111 on one side of the housing body 211 in the axial direction (left-right direction in FIGS. 13 to 15) will be described. The annular cooling member 212 described above is attached to the inner peripheral surface of the first portion 2111, and the stator 51 of the motor 5 formed in an annular shape is attached to the inner peripheral surface of the cooling member 212. . That is, the stator 51 is accommodated in the motor accommodating space 26 described above. As shown in FIG. 16, the cable 71 for supplying electricity to the stator 51 passes through the motor housing space 26, the first communication path 2115, and the central space 420, and passes through the second outside the housing 21. It extends to the support part 233.

  A groove 2121 is formed on the outer circumferential surface of the cooling member 212 in the radial direction, and a space surrounded by the groove 2121 and the inner circumferential surface of the first portion 2111 is a second coolant channel (second channel) 49. Is configured. The stator 51 is cooled by the coolant flowing through the second coolant channel 49. The second coolant channel 49 is formed so as to extend in a generally annular shape in the cooling member 212, but, like the first coolant channel 2117 having a different phase in the axial direction, the second shaft end member 42. It is formed in a C shape so as to avoid the portion where is disposed. That is, the second coolant channel 49 extends in an annular shape with the vicinity of the upper side of the second shaft end member 42 as one end, and passes through the first shaft end member 41 and the vicinity of the lower side of the second shaft end member 42. It extends to be an end. As shown in FIG. 13, a discharge hole 2119 is formed at a position corresponding to one end of the second coolant channel 49 in the first portion 2111, and from the discharge hole 2119, as will be described later. The coolant in the second coolant channel 49 is discharged.

  Further, as shown in FIGS. 12 and 14, the first coolant channel 2117 and the second coolant channel 49 are communicated with each other near the lower side of the second shaft end member 42 on the outer peripheral surface of the housing main body 211. The communication part 250 is provided. The communication section 250 has a first flow path 2501 extending radially outward from the first coolant flow path 2117, a first flow path 2501 and a second coolant flow path 49, and an axial extension extending in the axial direction. Two flow paths 2502 are formed. The first and second coolant passages 2117 and 49 communicate with each other through the first and second passages (communication passages) 2501 and 2502. Therefore, the coolant supplied from the supply hole 81 described above flows through the first coolant channel 2117 and then enters the second coolant channel 49 via the first and second channels 2501 and 2502 of the communication unit 250. Flows in. The coolant that has flowed through the second coolant channel 49 is discharged from the discharge hole 2119.

  Returning to FIG. 13, the description of the first portion 2111 is continued. The first end member 213 attached to the left end portion of the cooling member 212 in the axial direction is formed in a plate shape so as to cover the left side surface of the stator 51 in the axial direction. The radially inner end surface of the first end member 213 includes a first surface 2131 located on the left end side in the axial direction, and a second surface located adjacent to the first surface 2131 and located on the right end side in the axial direction. 2132. The inner diameter of the first surface 2131 is larger than that of the second surface 2132. That is, the first surface 2131 is located radially outward from the second surface 2132. Further, two grooves 2133 extending in an annular shape are formed on the first surface 2131, and one groove 2133 extending in an annular shape is also formed on the second surface.

  Further, as shown in FIG. 15, in the vicinity of the lowermost end in the vertical direction of the housing 21, a discharge path 2134 for discharging each groove 2133 of the first end member 213 to the outside is formed. That is, oil or the like that has passed through the annular groove 2133 is discharged from the discharge path 2134 to the outside near the lowermost end of the housing 21.

  Next, the second part 2112 of the housing body 211 will be described. The second end member 214 described above is attached to the end surface on the right side of the second portion 2112 in the axial direction. The second end member 214 is formed in a plate shape so as to extend radially inward, and a space surrounded by the inner peripheral surface of the second portion 2112, the second end member 214, and the second fixing member 402 is The above-described detector accommodating space 27 is configured. As shown in FIG. 16, the encoder 61 constituting the detector 6 is disposed in the detector accommodating space 27. The encoder 61 is fixed to the side surface in the axial direction of the second fixing member 402. A cable 72 for outputting a signal from the encoder 61 passes through the detector housing space 27, the second communication path 2116, and the central space 420 and extends to the second support portion 233 outside the housing 21. Yes.

  The radially inner end surface of the second end member 214 has a first surface 2141 located on the right end side in the axial direction, and a second surface located adjacent to the first surface 2141 and located on the left end side in the axial direction. Surface 2142. The inner diameter of the first surface 2141 is larger than that of the second surface 2142. That is, the first surface 2141 is located radially outward from the second surface 2142. Further, two grooves 2143 extending in an annular shape are formed in the first surface 2141, and one groove 2143 extending in an annular shape is formed in the second surface 2142.

  Further, as shown in FIG. 15, a discharge path 2144 for discharging each groove 2143 of the second end member 214 to the outside is formed in the vicinity of the lowermost end in the vertical direction of the housing 21. That is, as with the first end member 213 described above, oil or the like that has passed through the annular groove 2143 is discharged from the discharge path 2144 to the outside near the lowermost end of the housing 21.

  Next, the tool support 25 will be described. The tool support 25 includes an annular support main body 251, an annular connecting member 252 provided at the left end of the support main body 251 in the axial direction, and an annular first end member provided at the left end of the connecting member 252. 253 and an annular second end member 254 provided at the right end of the support body 251 in the axial direction. Further, a first cover member 255 and a second cover member 256 are attached to the first end member 253 and the second end member 254, respectively. Hereinafter, each member will be described in detail.

  The support main body 251 is provided at a position corresponding to the central part 2110 and the second part 2112 of the housing main body 211, and has a central part 2510 arranged in the axial direction and an end part 2511 on the right side thereof. The above-described bearings 241 and 242 and the supply member 28 are fixed to the outer peripheral surface of the central portion 2510. On the other hand, the tool 4 is fixed to the inner peripheral surface of the central portion 2510. Hereinafter, the attachment structure of the tool 4 to the tool support 25 will be described.

  As shown in FIG. 13, a flow passage 55 extending in the radial direction is formed at the center of the inner peripheral surface of the central portion 2510, and the inner peripheral surface of the central portion 2510 is formed so as to cover the flow passage 55. A shallow belt-like groove 56 is formed. A through hole 57 extending to the left side in the axial direction communicates with the flow path 55, and a push pin 58 is inserted into the through hole 57. Further, an annular elastic member 59 is disposed on the inner peripheral surface of the central portion so as to cover the belt-like groove 56, and the above-described internal gear-like tool 4 is attached thereto. Further, the through hole 57, the flow path 55, and the groove 56 are filled with oil, and the pressure of the oil increases by pushing the push pin 58. Thereby, the elastic member 59 is deformed so as to protrude inward in the radial direction, and the outer peripheral surface of the tool 4 is pressed. As a result, the tool 4 is fixed to the tool support 25. On the other hand, when the push pin 58 is pulled out, the pressure of the oil in the through hole 57, the flow path 55, and the groove 56 decreases, the elastic member 59 returns to its original shape, and the tool 4 can be removed. Further, O-rings are provided in the vicinity of both ends in the axial direction of the belt-like groove. Such push pins 58 are arranged at predetermined intervals in the circumferential direction of the tool support 25 as shown in FIG. However, other methods of attaching the tool can be employed.

  Next, the end part 2511 of the support body 251 will be described. The outer peripheral surface of the end portion 2511 faces the detector housing space 27 described above, and an annular memory scale 62 constituting the detector 6 is attached to the outer peripheral surface. As shown in FIG. 16, the memory scale 62 faces the encoder 61 described above in the detector accommodating space 27.

  Further, the second end member 254 described above is attached to the right end portion of the end portion portion 2511. The second end member 254 is formed so as to extend radially outward from the end portion portion 2511, and the radially outer end surface of the second end member 254 is the above-described second end member 214 of the housing 21. Opposing to the end face, a gap of the labyrinth structure is formed. Specifically, the end surface of the second end member 254 of the tool support 25 has a shape that faces the end surface of the second end member 214 of the housing 21 and is located on the right end side in the axial direction. The first surface 2541 has a first surface 2541 and a second surface 2542 adjacent to the first surface 2541 and positioned on the left end side in the axial direction. The outer diameter of the first surface 2541 is larger than that of the second surface 2542. That is, the first surface 2541 is located radially outward from the second surface 2542. Further, two grooves 2543 extending annularly are formed on the first surface 2541, and one groove 2543 extending annularly is also formed on the second surface 2542. These grooves 2543 are opposed to the grooves 2143 formed on the end surface of the second end member 214 of the housing 21, and the oil or the like that has passed through these grooves 2143, 2543, as shown in FIG. From the groove formed in the second end member 214, it passes through the discharge path 2144 and is discharged to the outside.

  A second cover member 256 is attached to the right side surface of the second end member 254 in the axial direction. The second cover member 256 is formed so as to cover a gap between the second end member 214 of the housing 21 and the second end member 254 of the tool support 25. Therefore, for example, during processing, oil, chips and the like are prevented from entering the detector accommodating space 27 through the gap.

  Next, the connecting member 252 will be described. The connecting member 252 is connected to the left end portion of the support body 251 in the axial direction, and a recess is formed on the right side surface so as to form the first discharge path 47 described above between the connecting member 252 and the first bearing 241. The outer peripheral surface of the connecting member 252 faces the motor housing space 26 described above, and an annular rotor 52 constituting the motor 5 is attached to the outer peripheral surface. As shown in FIG. 13, the rotor 52 faces the stator 51 described above in the motor housing space 26.

  A first end member 253 that extends to the left in the axial direction is connected to the inner peripheral surface of the connecting member 252. The outer peripheral surface of the first end member 253 constitutes a part of the motor housing space 26. The outer peripheral surface has an end surface that forms a gap of the labyrinth structure so as to face the end surface of the first end member 213 of the housing 21. Specifically, the end surface of the first end member 253 of the tool support 25 has a shape facing the end surface of the first end member 213 of the housing 21 and is located on the left end side in the axial direction. It has a first surface 2531 and a second surface 2532 that is adjacent to the first surface 2531 and located on the right side in the axial direction. The outer diameter of the first surface 2531 is larger than that of the second surface 2532. Further, two grooves 2533 extending annularly are formed on the first surface 2531, and one groove 2533 extending annularly is formed on the second surface 2532. These grooves 2533 are opposed to the grooves 2133 formed on the end surface of the first end member 213 of the housing 21, and the oil or the like that has passed through these grooves 2133, 2533, as shown in FIG. From the groove 2133 formed in the first end member 213, it passes through the discharge path 2134 and is discharged to the outside.

  A first cover member 255 is attached to the left side surface of the first end member 213 in the axial direction. The first cover member 255 is formed so as to cover a gap between the first end member 213 of the housing 21 and the first end member 253 of the tool support 25. Therefore, for example, oil, chips and the like are prevented from passing through the gap and entering the motor housing space 26 during processing.

  Next, the operation of the gear machining apparatus configured as described above will be described. First, as shown in FIG. 1, the workpiece W on the arrangement table 800 arranged in the vicinity of the gear machining apparatus is installed in the gear machining apparatus by the robot arm 700. That is, in order to form a predetermined crossing angle on the workpiece W, first, the motor 2338 is driven, and the tool unit is rotated around the rotation axis S by a predetermined angle. Next, after the work W is attached to the shaft member 3101 of the headstock 31, the headstock 31 and the tailstock 32 are brought close to each other to sandwich the work W. In this state, the shaft member 3101 of the head stock 31 is rotated together with the workpiece W. In parallel with this, the motor 5 is driven to rotate the tool 4 of the tool unit 2 so as to synchronize with the workpiece W. Subsequently, the spindle stock 31 and the tailstock 32 are integrally moved in the Y-axis direction to bring the workpiece W close to the tool 4. Then, the workpiece W is processed by engaging the workpiece W and the tool 4 and rotating them. At this time, when the detector 6 detects the rotational angle position of the tool support 25, the rotation of each motor is controlled so that the rotation of the tool 4 and the workpiece W is synchronized. Moreover, the housing 21 is moved in the Y-axis direction together with the support 23 as necessary, and the workpiece W is crowned. Simultaneously with such a machining operation, cutting oil is sprayed onto the meshing portion between the tool 4 and the workpiece W to cool, lubricate, and remove chips from the machining site. Thus, after machining for a predetermined time, driving of each motor is stopped and the machined workpiece W is removed.

  During the machining, the tool unit 2 operates as follows. First, oil mist is supplied to the bearings 241 and 242. That is, the lubricating oil supplied from the supply path 425 shown in FIG. 12 is supplied as an oil mist from the oil mist flow path 280 between the bearings 241 and 242 to the bearings 241 and 242 via the branch 283. Thereby, the outer ring, inner ring, and rolling element of the bearings 241 and 242 are lubricated by the oil mist. And the oil mist discharged | emitted from each bearing 241,242 is discharged | emitted from the discharge hole 290 through the lower end channel | path 291 shown in FIG.

  Further, as described above, the coolant supplied from the supply hole 81 in FIG. 12 cools the central portion 2110 of the housing 21 while flowing in the circumferential direction of the housing 21 through the first coolant channel 2117, thereby both bearings. 241 and 242 are cooled from outside in the radial direction. Then, the coolant flows into the communication portion 250 below the second shaft end member 42, and then flows into the second coolant channel 49 from here. As described above, the coolant flowing into the second coolant channel 49 cools the cooling member 212 while flowing in the circumferential direction of the housing 21, thereby cooling the stator 51 of the motor 5 attached to the cooling member 212. To do. The coolant is discharged from a discharge hole 2119 formed above the second shaft end member 42. The coolant flow may be opposite to this, and the coolant may be supplied from the discharge hole 2119, the stator may be cooled, the bearing may be cooled, and then discharged from the supply hole 81. Good. As described above, during the machining of the workpiece W, the above-described operation is performed to ensure a stable operation of the tool unit 2.

  Further, as described above, air is supplied to the second support portion 233 that supports the housing 21 from the outside via the pipe member 2336. As shown in FIG. 16, this air flows from the central space 420 of the second shaft end member 42 attached to the housing 21 through the first communication path 2115 and the second communication path 2116, respectively. And supplied to the detector accommodating space 27. As a result, the internal pressure of the motor housing space 26 and the detector housing space 27 rises, and air is released to the outside through a gap in the labyrinth structure formed between the housing 21 and the tool support 25. Therefore, this air serves as a wall and prevents cutting oil and chips from entering the housing 21. Also, suppose that the oil that has entered the gap beyond the cover members 255 and 256 flows into the grooves 2143 and 2543, and is discharged outside through the discharge paths 2134 and 2144.

  As described above, in the present embodiment, the first coolant passage 2117 through which the coolant passes is formed in the housing 21 radially outward of the bearings 241 and 242, so that the outer ring side of the bearings 241 and 242 is cooled. be able to. On the other hand, the inner ring side of the bearings 241 and 242 is cooled by the coolant supplied to the meshing position between the tool 4 and the workpiece W. Therefore, since the bearings 241 and 242 can be cooled from inside and outside in the radial direction, a temperature difference between the outer ring side and the inner ring side of the bearings 241 and 242 can be reduced. As a result, since the bearings 241 and 242 can be stably operated, the tool 4 can be stably rotated with respect to the housing 21.

  Further, since the second coolant passage 49 through which the coolant passes is formed at a position corresponding to the stator 51 in the housing 21, the stator 51 can be cooled. As a result, it is possible to stably operate the stator and prevent malfunctions.

  And since the 1st coolant flow path 2117 and the 2nd coolant flow path 49 are connecting in the communication part 250, the coolant supplied to one flow path can be flowed also to the other flow path. Therefore, the coolant can be supplied and discharged at a single location, so that the structure can be simplified.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to this, A various change is possible unless it deviates from the meaning. Note that the following modifications can be combined as appropriate.

  For example, in the above embodiment, the tool unit 2 is fixed and the workpiece support unit 3 is brought close to the tool unit 2 to perform machining. On the contrary, the workpiece support unit 3 is fixed and the tool support unit 3 is fixed. The unit 2 may be moved. In the work support unit 3, the work W is held between the headstock 31 and the tailstock 32, but the work W may be supported only by the headstock 31.

  In the said embodiment, although a coolant is used as a cooling medium, water and air may be sufficient. Further, the first coolant channel 2117 and the second coolant channel 49 do not necessarily need to communicate with each other and may be separated.

  Moreover, in the said embodiment, although the 1st coolant flow path 2117 is formed in the center site | part 2110 of the housing main body 211, the position is not specifically limited. Therefore, it is possible to provide a flow path that directly contacts the outer peripheral surfaces of the bearings 241 and 242. Further, the number of flow paths is not particularly limited, and two or more flow paths can be provided. Alternatively, a flow path for a cooling medium separate from the housing 21 can be provided. Furthermore, the configuration and number of bearings are not particularly limited. In addition, with respect to other configurations, the tool support 25 to which the tool 4 is attached via at least the housing 21 via the bearings 241 and 242 may be rotatably supported.

2 Tool unit 21 Housing 2117 First coolant channel (first channel)
241,242 Bearing 2501 First flow path (communication path)
2502 Second channel (communication path)
280 Oil mist channel (third channel)
3 Work support unit 4 Tool 49 Second coolant channel (second channel)

Claims (5)

An annular tool unit for machining the workpiece gear;
A workpiece support unit that rotatably supports a workpiece gear and is relatively close to and away from the tool unit;
With
The tool unit is
An annular housing;
An annular bearing attached to the inner peripheral surface of the housing;
An annular tool support disposed rotatably on the inner peripheral side of the housing via the bearing;
An internal gear-shaped tool that is attached to the inner peripheral side of the tool support and meshes with a work gear;
With
In the housing, an annular first flow path through which a cooling medium passes is formed at a position corresponding to the bearing.   The gear machining apparatus according to claim 1, wherein the first flow path is formed radially outward of the bearing and spaced from the bearing. An annular stator portion attached to the inner peripheral side of the housing, and a rotor portion attached to the outer periphery of the support and disposed opposite to the stator, the tool support being rotated with respect to the housing A driving means;
The gear processing device according to claim 1, wherein an annular second flow path through which a cooling medium passes is formed at a position corresponding to the stator portion in the housing.   The gear processing apparatus according to claim 3, further comprising a communication path that connects the first flow path and the second flow path. In the tool unit, an annular third flow path through which the lubricating oil passes is formed at a position corresponding to the bearing,
The gear machining apparatus according to any one of claims 1 to 4, wherein the third flow path includes at least one supply path for supplying the lubricant to the bearing.