JP5466078B2 - Work rotation device - Google Patents

Description

  The present invention relates to a workpiece rotating device used for rotating a workpiece (thing that needs to be subjected to some processing such as machining).

  For example, Patent Document 1 discloses a work rotation device including a turntable for rotating a work. In this work rotating device 2, as shown in FIG. 9, the rotation of the motor 3 is decelerated by the speed reducer 4, and the output of the speed reducer 4 is taken out from the flange 6. A turntable 8 for rotating a workpiece (not shown) is fixed to the flange 6 with bolts 14. The work rotating device 2 is provided with an encoder 12 for the purpose of detecting the rotation of the rotating disk 8. Since the encoder 12 cannot be provided in the vicinity of the rotating disk 8 due to space limitations, in the work rotating device 2, a cylindrical rod 16 that is a rotating member for detection is connected to the flange 6 of the speed reducer 4 via a bolt 14. The tip of the cylindrical rod 16 is extended to the counter-rotating disc side of the speed reducer 4. The encoder 12 detects the rotation of the tip of the cylindrical bar 16 to detect the rotation of the rotating disk 8 (indirectly).

WO2007 / 125800 (FIG. 1)

  However, in the conventional work rotating device 2, the cylindrical rod 16 for detecting the rotation of the rotating disk 8 is fixed to the flange 6, which is an output member of the speed reducer 4, via the bolt 14, and the speed is reduced as it is. It was extended to the counter-rotating disc side of machine 4. That is, the drive vibration of the speed reducer 4 from the flange 6 side and the machining vibration from the rotating disk 8 side influence each other, and the structure reaches the encoder vicinity in an amplified state. For this reason, in particular, if there is a slight inclination or deviation between the three shaft centers of the rotating disk 8, the flange 6 and the cylindrical rod 16 due to processing errors, the axial deflection of the cylindrical rod 16 near the encoder 12 tends to increase. There has been a problem that a rotation detection error in the encoder 12 is likely to occur.

  The present invention has been made to solve such a conventional problem, and an object thereof is to further improve the reliability of rotation detection of the rotating disk in the work rotating device.

The present invention relates to a work rotating device including a speed reducer, a rotating disk for rotating the work, and a rotation detecting means for detecting the rotation of the rotating disk, wherein the speed reducer includes a speed reducer casing. When having an output rotation member supported by the reduction gear bearing speed reducer casing, and the rotating disk and detecting rotation unit that rotates integrally, projecting in a state of being through the reduction gear The detection rotation part is separate from the output rotation member and is connected to the output rotation member, and at least one of the detection rotation parts is directly supported by a detection rotation part bearing, and the rotation disk the rotation of, by said rotation detecting means, by adopting a configuration in which detected by detecting the rotation of the detection rotary portion supported directly by the detecting rotor portion bearing is obtained by solving the above problems.

  In the present invention, the “rotating part for detection” means a state in which a reduction gear is penetrated for the purpose of drawing out the rotation (state) of the rotating disk by rotating integrally with the rotating disk. It means the protruding part. Further, the phrase “directly supported by the bearing” means “the bearing is disposed for the purpose of supporting the detection rotating part itself”. In other words, a configuration in which an auxiliary member is interposed between the detection rotating part and the bearing simply for positioning and positioning of the bearing is included in the concept of “directly supported by the bearing”. It is.

  In the present invention, the detection rotating part that rotates integrally with the rotating disk is protruded in a state where it passes through the speed reducer, and the rotation of the rotating disk itself is drawn out. In addition, at least one of the detection rotating parts is directly supported by a bearing. As a result, the rotation of the rotating disk can be detected by detecting the rotation of the rotating part for detection that is stably supported by the bearing, thereby reducing the occurrence of detection errors and, as a result, high accuracy (high reliability). ) Rotation can be detected.

  ADVANTAGE OF THE INVENTION According to this invention, the reliability of rotation detection of the turntable in a workpiece | work rotating apparatus can be improved more.

Sectional drawing which shows an example of embodiment of the workpiece | work rotating apparatus which concerns on this invention Sectional view along the line II-II in FIG. Sectional drawing which shows an example of other embodiment of this invention Side view seen from the direction of arrow IV in FIG. Sectional drawing which shows an example of other embodiment of this invention. Enlarged sectional view of the vicinity of view VI in FIG. Sectional drawing which shows an example of other embodiment of this invention. Sectional view along the line VIII-VIII in FIG. Sectional drawing which shows an example of the conventional workpiece rotation apparatus

  Hereinafter, an example of an embodiment of the present invention will be described in detail based on the drawings.

  FIG. 1 is a cross-sectional view showing an example of an embodiment of a workpiece rotating device according to the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG.

  The workpiece rotating device 20 includes a motor 22, a speed reducer 24, a rotating disk 26 for rotating a workpiece (not shown), and an encoder device (rotation detecting means) 28 for detecting the rotation of the rotating disk 26. And comprising. From the turntable 26, a detection cylindrical portion (detection rotation portion) 26 </ b> A is integrally projected in a cantilever state and penetrating through the center in the radial direction of the speed reducer 24. The detection cylindrical portion 26 </ b> A is directly supported by the bearing 30. The rotation of the turntable 26 is directly detected by detecting the rotation of the detection cylindrical portion 26 </ b> A of the turntable 26 itself directly supported by the bearing 30 by the encoder device 28.

  Details will be described below.

  A first pulley 40 is fixed to the output shaft 22 </ b> A of the motor 22. The rotation of the first pulley 40 can be transmitted to the second pulley 44 via the timing belt 46, whereby the input shaft 42 of the speed reducer 24 is rotated.

  In the speed reducer 24 according to this embodiment, the external gears 48 and 50 are engaged with the internal gear 52 while being eccentrically oscillated on the outer periphery of the input shaft 42 (this is known per se). This is a reduction gear. The internal gear 52 is integrated with the speed reducer casing 32 that constitutes the outer periphery of the speed reducer 24. In the present embodiment, the reduction gear casing 32 is fixed to the outer casing 35 that constitutes the outer peripheral portion of the workpiece rotating device 20 via a bolt 39. The outer casing 35 includes a casing body 35 </ b> A and a cover 35 </ b> B that is fixed to the casing body 35 </ b> A and covers the end portion of the work rotating device 20.

  As shown in FIG. 2, the internal teeth of the internal gear 52 are configured by rollers 52A. The number of teeth of the internal teeth is “90”. In practice, however, the number of rollers 52A (which constitute the internal teeth) 52A of the internal gear 52 is thinned out to half of “45”. On the other hand, the number of teeth of the external gears 48 and 50 is “89” in this example. That is, the number of mechanical teeth of the internal gear 52 is “1” greater than the number of teeth of the external gears 48 and 50. Even with this configuration, the number of teeth of the internal gear (number of rollers) is 90 and the number of teeth of the external gears 48 and 50 is 89 (although the transmission capacity is slightly reduced), the operation is exactly the same.

  Inner pins 54 are loosely fitted to the external gears 48, 50 (through a gap), and the inner pins 54 are first and second arranged on both sides in the axial direction of the external gears 48, 50. The flanges 56 and 58 are press-fitted. The first and second flanges 56 and 58 are connected and integrated by a carrier pin 60 provided separately from the inner pin 54. The first and second flanges 56 and 58 are rotatably supported by the speed reducer casing 32 by bearings 62 and 64, and constitute an “output rotating member” of the speed reducer 24.

  The turntable 26 is fixed to a second flange 58 that is an output rotating member via a bolt 66. In the circumferential direction of the second flange 58, the bolt 66 is connected to and integrated with the second flange 58 and the first flange 56, where the inner pin 54 or the carrier pin 60 is disposed (from the axial direction). When viewed, it is screwed into a position overlapping the inner pin 54 or the carrier pin 60 which is a connecting member of the first and second flanges. This is because the rotating plate 26 is intended to be firmly connected to the second flange 58 by using the largest possible bolt 66 (which can be screwed in deeply).

  The detection cylindrical portion 26 </ b> A is integrated with the rotating plate 26 and protrudes in a cantilever state and penetrating through the center in the radial direction of the speed reducer 24. In this embodiment, the detection cylindrical portion 26A is formed integrally with the rotating disk 26 from the beginning (not connected by a bolt). The detection cylindrical portion 26A is used for extracting (transmitting) the rotation of the rotating disk 26 from the rotating disk 26 to a portion where the encoder device 28 is disposed in order to detect the rotation of the rotating disk 26. The

  The detection cylindrical portion 26A protruding in a cantilevered state from the rotating disk 26 is directly supported by the bearing 30 at the tip end portion 26A1. In the present embodiment, a bearing housing portion 35B1 is formed to protrude from the cover 35B of the outer casing 35, and the bearing 30 is incorporated in the bearing housing portion 35B1. Reference numeral 31 denotes a retaining ring for locking the bearing 30 in the bearing housing portion 35B1.

  The encoder device (rotation detection means) 28 is disposed on the speed reduction mechanism side of the bearing 30 adjacent to the bearing 30 in the axial direction of the detection cylindrical portion 26A, and the detection is performed at a portion that is stably supported by the bearing 30. The rotation of the cylinder portion 26A for use is detected. The encoder device 28 is a known reflective optical encoder that counts the number of slits (not shown) formed on the outer periphery of the detection cylindrical portion 26A. In this embodiment, the encoders 28A and 28B having a phase difference are used in a set of two stations, and the rotational speed and direction of the detection cylindrical portion 26A are detected. However, in the present invention, it is not essential to use the encoders in pairs. Also, even if two sets are used in one set, how to use each encoder is not limited to the above example.

  The encoder device 28 dislikes the lubricant. Therefore, in this embodiment, the speed reducer 24 is sealed between the speed reducer casing 32 and the first and second flanges 56 and 58 by oil seals 70 and 72, and the first and second flanges 56, 58 and the input shaft 42 penetrating the first and second flanges 56 and 58 are sealed with oil seals 74 and 76. As a result, the inside of the speed reducer 24 becomes a closed space P1 in which the lubricant is enclosed. The detection cylindrical portion 26A extends to the outside of the closed space P1, and rotation detection by the encoder device 28 is performed in the extended portion (that is, the portion where no lubricant is present).

  Next, the operation of the workpiece rotating device 20 will be described.

  The rotation of the output shaft 22A of the motor 22 is decelerated by the first pulley 40, the timing belt 46, and the second pulley 44, and then input to the input shaft 42 of the speed reducer 24. When the input shaft 42 rotates and the external gears 48 and 50 oscillate and rotate and internally mesh with the internal gear 52, the meshing positions of the external gears 48 and 50 and the internal gear 52 are sequentially shifted. Since the internal gear 52 is fixed to the reduction gear casing 32, the external gears 48 and 50 rotate (rotate) relative to the internal gear 52, and this relative rotation (autorotation) is the inner pin 54. Is transmitted to the first and second flanges 56 and 58. Thereby, the turntable 26 rotates integrally with the first and second flanges 56 and 58.

  When the turntable 26 rotates, the detection cylindrical portion 26 </ b> A also rotates in the same direction at the same rotation speed as the turntable 26. The counter-rotating disc side of the detection cylindrical portion 26 </ b> A is directly supported by the cover 35 </ b> B of the outer casing 35 by the bearing 30. For this reason, “rattle” or the like does not occur in the rotation of the detection cylinder portion 26A, and the rotation of the detection portion of the encoder device 28 of the detection cylinder portion 26A is extremely stable. Furthermore, in this embodiment, since the detection cylindrical portion 26A is integrated with the turntable 26 itself, there is no fear of, for example, shaking due to poor coupling (a further increase in rigidity can be expected), and Since the detected rotation is the rotation of the rotating disk itself, naturally there is no possibility of deviation from the actual rotation of the rotating disk. As a result, the encoder device 28 can accurately detect the rotation state of the detection cylindrical portion 26A without causing a detection error or the like.

  Next, another embodiment of the present invention will be described with reference to FIGS. 3 and 4.

  In this embodiment, only the configuration of the cover 135B constituting a part of the outer casing 135 is different from the previous embodiment. That is, in the workpiece rotating device 120 according to this embodiment, a cover 135B extending from the casing main body 135A to a position including the bearing 130 is fixed to the main body 135A of the outer casing 135. A bearing 130 for fixing the detection cylindrical portion 126A is incorporated in a bearing housing portion 135B1 at the tip of the cover 135B.

  Compared to the previous embodiment, as the cover 135B of the outer casing 135 is reduced in weight and size, the weight of the work rotating device 120 can be reduced, and the space P2 indicated by the oblique lines in FIG. It can be used for the arrangement of

  Since the other configuration is the same as that of the previous embodiment, the same or functionally similar parts are denoted by the same reference numerals with the last two digits in the figure, and redundant description is omitted.

  5 and 6 show still another embodiment of the present invention.

  In the two previous embodiments, the bearing 30 (130) for supporting the detection cylindrical portion 26A (126A) is used as the cover 35B that constitutes a part of the outer casing 35 (135) of the workpiece rotating device 20 (120). (135B), in the work rotating apparatus 220 according to this embodiment, the bearing 230 is arranged between the input shaft 242 and the detection cylindrical portion 226A.

  The speed reducer 224 employed in this embodiment is the same in basic structure as the speed reducers 24 and 124 according to the previous embodiment, and the internal gear 252 is moved while the external gears 248 and 250 are swung. This is a swinging intermeshing type reduction gear that is in meshing engagement. As already described, the input shaft 242 of the speed reducer 224 is a member having a hollow portion 242A in the central portion in the radial direction. The bearing 230 that supports the detection cylindrical portion 226A is incorporated inside the input shaft 242 that is a hollow member in this embodiment.

  As enlarged in FIG. 6, this bearing 230 is mainly constituted by a needle 230B having an inner ring 230A. Needle 230B is held by retainer 230C. No outer ring is provided (the input shaft 242 also serves as the outer ring). The bearing 230 is restricted from moving in the axial direction by a step portion 226A1 and a retaining ring 231 formed in the detection cylindrical portion 226A. Reference numerals 233 and 235 in FIG. 6 are spacers for finely adjusting the axial position of the bearing 230.

  According to the configuration according to this embodiment, the cover 35B (135B) of the outer casing 35 (135) that is essential for incorporating the bearing 30 (130) in the previous two embodiments can be omitted. Further weight saving and space saving can be achieved.

  Since other configurations are the same as those of the previous two embodiments, the same or functionally similar parts are denoted by the same reference numerals in the last two digits in the drawing, and redundant description is omitted.

  In the above embodiment, the speed reducer having the same structure is adopted as the speed reducer 24 (124, 224). However, in the present invention, the specific structure of the speed reducer is not particularly limited. 7 and 8 show an example in which the present invention is applied to a work rotating device 320 having a speed reducer 324 having another structure.

  The structure of the speed reducer 324 in this embodiment will be briefly described. The rotation of the output shaft 322A of the motor 322 is input to the first intermediate shaft 380 via the first pulley 340, the timing belt 346, and the second pulley 344. Is done. A first gear 384 is fixed to the end of the intermediate shaft 380 opposite to the pulley. The first gear 384 meshes with the second gear 388 integrated with the second intermediate shaft 386. The second intermediate shaft 386 is supported by the cover 332B and the first flange 356 of the speed reducer casing 332 of the speed reducer 324 via bearings 390 and 392, and has a third gear 394 integrally. The third gear 394 meshes simultaneously with three eccentric body shaft gears 396 (only one is shown in the figure), and drives the three eccentric body shafts 398. The rotation of the three eccentric body shafts 398 causes the external gears 348 and 350 to internally mesh with the internal gear 352 via the eccentric bodies 397 and 399 formed on the eccentric body shaft 398.

  In the speed reducer 324, since the internal gear 352 is integrated with the main body 332 A of the speed reducer casing 332, the relative rotation (spinning) of the external gears 348 and 350 with respect to the internal gear 352 causes each eccentric body shaft 398 to rotate. Are taken out from the first and second flanges 356 and 358 as revolutions around the axis O <b> 1 of the workpiece rotation device 320. The first and second flanges 356 and 358 are integrated by a connecting body 360 and a bolt 357. The turntable 326 is fixed to the second flange 358 via a bolt 366.

  Also in this embodiment, the detection cylindrical portion 326A protrudes integrally from the rotating disk 326 in a cantilever state and penetrates the center in the radial direction of the speed reducer 324, and the axial direction of the detection cylindrical portion 326A Is supported directly by a bearing 330 at one location on the side of the anti-deceleration mechanism. The bearing 330 is incorporated in the cover 332B of the reduction gear casing 332 (more specifically, between the bearing 390 and the oil seal 374 on the inner periphery of the cover 332B). The rotation of the turntable 326 is directly detected by detecting the rotation of the cylindrical portion for detection 326A supported directly by the bearing 330 by the encoder device 328.

  Also in this embodiment, the bearing 364 of the second flange 358 of the reduction gear 324 is a seal bearing, and the gap between the cover 332B of the reduction gear casing 332 and the detection cylindrical portion 326A is sealed by the oil seal 374, Further, the space between the cover 332B and the first intermediate shaft 380 is sealed by an oil seal 375, so that the inside of the speed reducer 324 is a closed space P3 in which a lubricant is enclosed. The detection cylindrical portion 326A extends to the outside of the closed space P3, and rotation detection by the encoder device 328 is performed in the extended portion (that is, the portion where no lubricant is present).

  In this embodiment, the member corresponding to the cover 35B in the above embodiment can be omitted, and the effect that the lubricant of the reduction gear 324 can be used for the bearing 330 is also obtained.

  Since the other configuration is the same as that of the previous embodiment, the same or functionally similar parts are denoted by the same reference numerals with the last two digits in the figure, and redundant description is omitted.

  Thus, in this invention, it does not specifically limit about the structure of the reduction gear specifically incorporated in the workpiece | work rotation apparatus. In addition to the speed reducer as described above, for example, a simple planetary gear speed reducer, a parallel shaft gear speed reducer, a speed reducer adopting a traction drive mechanism, etc. Reducer can be adopted. In accordance with the specific configuration of the speed reducer, the present invention also particularly restricts in what kind of member a bearing for supporting the detection rotating portion for detecting the rotation of the rotating disk is incorporated. Not.

  Further, in the above embodiment, the detection rotating part is formed integrally with the rotating disk to enhance the rigidity of the detection rotating part. However, in the present invention, the detection rotating part is Is not necessarily formed integrally with the rotating disk, and may be, for example, a bolt connection or a press-fit connection. Further, if the rotating disk and the rotating part for detection are rotated integrally, it is not necessary to be directly connected. For example, by fixing the rotating disk to the flange and fixing the detecting rotating part to the flange, as a result You may make it both rotate integrally.

  Moreover, in the said embodiment, what was equipped with the 1st, 2nd flange connected with the coupling body on the axial direction both sides of an external gear as a reduction gear is employ | adopted, and a rotary disk is this 1st. Alternatively, in the circumferential direction of one of the second flanges (the second flange in the above example), a bolt that is screwed (large and long) into a portion where the connecting body is disposed is attached to the one flange. A fixed structure was adopted. However, the connection mode between the output rotating member of the reduction gear and the rotating disk in the present invention is not limited to this configuration example. For example, a configuration may be employed in which bolts are connected at a position unrelated to the position of the connecting portion.

DESCRIPTION OF SYMBOLS 20 ... Work rotating apparatus 22 ... Motor 24 ... Reduction gear 26 ... Rotary disk 26A ... Cylindrical part for detection (rotating part for detection)
28. Encoder device (rotation detection means)
DESCRIPTION OF SYMBOLS 30 ... Bearing 32 ... Reducer casing 32A ... Casing main body 32B ... Cover 35 ... Outer casing 35A ... Casing main body 35B ... Cover

Claims (8)

In a work rotation device comprising a speed reducer, a rotating disk for rotating a work, and a rotation detecting means for detecting the rotation of the rotating disk,
The speed reducer has a speed reducer casing, and an output rotating member supported by the speed reducer casing by a speed reducer bearing,
The detection rotating part that rotates integrally with the rotating disk is protruded in a state where the speed reducer is penetrated ,
The detection rotating part is separate from the output rotating member and is connected to the output rotating member.
At least one of the detection rotating parts is directly supported by the detection rotating part bearing,
Wherein the rotation of the rotating disk, by said rotation detecting means, a work rotating device and detecting by detecting the rotation of the detection rotary portion supported directly by the detecting rotor portion bearing. In claim 1,
The detection rotating part is supported by the casing of the workpiece rotating device via the detection rotating part bearing ,
A casing main body constituting an outer peripheral portion of the work rotating device, a cover fixed to the casing main body and extended from the casing main body to a position including the detection rotating portion bearing; With
The work rotating device, wherein the detection rotating part bearing is incorporated in the cover . In claim 1 or 2,
The output rotating member has a first flange and a second flange connected by a connecting body,
The work is characterized in that the first flange is supported by the reducer casing by the first reducer bearing, and the second flange is supported by the reducer casing by the second reducer bearing. Rotating device. In any one of Claims 1-3,
The speed reducer is a swinging internal meshing type speed reducer that internally meshes with an internal gear while swinging an external gear, and includes a hollow member at the radial center of the speed reducer. ,
The work rotating device, wherein the detection rotating part bearing is incorporated inside the hollow member. In claim 4,
The workpiece rotating device, wherein the hollow member is an input shaft of the speed reducer including an eccentric body that swings the external gear. In claim 4 or 5,
The speed reducer includes first and second flanges connected by a connecting body on both axial sides of the external gear.
The rotating disk is fixed to the one flange by a bolt screwed into a portion where the connecting body is disposed in a circumferential direction of one of the first and second flanges. A workpiece rotating device characterized by In any one of Claims 1-6,
By sealing between the casing of the speed reducer and the detection rotating part, the inside of the speed reducer becomes a closed space in which a lubricant is enclosed,
The workpiece rotating device, wherein the detection rotating portion extends to the outside of the casing, and rotation detection is performed by the rotation detecting means in the extended portion. In claim 7,
The workpiece rotating device, wherein the detection rotating portion bearing is supported on the reduction gear side from a portion where the space between the casing of the reduction gear and the detection rotating portion is sealed.

Images