TWI698303B - Reducer for rotary table - Google Patents

Abstract

The reducer 10 for a rotary table of the present invention includes: a base 12; an input shaft 14 that is rotatably supported by the base 12 so as to receive the driving force of the motor to rotate around the axis; and a conversion part 15 that connects the input shaft 14 The direction of the rotation axis is changed to a different direction; the deceleration part 16, which has a fixed part 42 held on the base 12, and can rotate relative to the fixed part 42 and rotates at the number of rotations reduced from the number of rotations of the conversion part 15 The output portion 44; and the turntable support portion 18, which are formed to protrude from the outer peripheral surface of the output portion 44 toward the outer side in the radial direction.

Description

Reducer for rotating table

The invention relates to a reducer for a rotating table.

As disclosed in Japanese Patent Application Laid-Open No. 2010-159851, there has been previously known a reducer which is composed of a method in which the output unit rotates by the number of revolutions after the number of revolutions from the motor is reduced. As shown in FIG. 3, the speed reducer includes: an input shaft 101 which receives the driving force of the motor to rotate; a conversion part 102 which rotates around an axis in a direction different from the rotation axis of the input shaft 101; and a reduction part 103, It has a crank shaft 104 that rotates in conjunction with the rotation of the conversion part 102. The deceleration part 103 has: a crankshaft 104; a housing 106 fixed to the base 105; a carrier 107; and a bearing 108 provided between the housing 106 and the carrier 107. The carrier 107 rotates along with the rotation of the crankshaft 104. Since the upper surface of the carrier 107 of the reducer disclosed in Japanese Patent Laid-Open No. 2010-159851 is exposed, the operator can install components on the upper surface. For example, if the operator mounts the rotating table on the carrier 107, the reducer may function as a reducer for the rotating table. However, since the rotating table is mounted on the upper surface of the carrier 107 of the reducer, there is a problem that the position of the rotating table becomes higher.

The object of the present invention is to provide a reducer for a rotary table that enables the arrangement of the rotary table in a low position. A reducer for a rotary table according to one aspect of the present invention includes: a base; an input shaft that is rotatably supported by the base by receiving the driving force of the motor to rotate around the shaft; The direction of the rotation axis is transformed into a different direction; the deceleration part has a fixed part held on the base part, and an output part that can rotate relative to the fixed part and rotates at the number of rotations reduced from the number of rotations of the conversion part ; And the rotating table supporting portion, which is formed in a manner protruding from the outer peripheral surface of the aforementioned output portion toward the radially outer side. In the present invention, the rotating table can be arranged in a low position. The purpose, features, and advantages of the above-mentioned speed reducer for a rotary table can be further clarified by the following detailed description and drawings.

Hereinafter, an exemplary reduction gear for a rotating table will be described with reference to the drawings. As shown in FIG. 1, the reducer system for a turntable (hereinafter referred to as a reducer 10) is a rotating device 1 for rotating the turntable TT. In addition to the speed reducer 10, the rotating device 1 also includes a motor 5 as a driving source. The reduction gear 10 is mounted on the mounting surface FP (reduction gear mounting surface), and is fixed to the mounting surface FP by a fastening member (not shown). The speed reducer 10 includes: a base 12; an input shaft 14 that is rotatably supported by the base 12; a conversion part 15 that is linked to the input shaft 14; a speed reduction part 16 that is formed separately from the base 12; and a turntable support part 18. It is used to support the rotary table TT. The base 12 has a top surface 20 and a side wall 22 that extends from the outer periphery of the top surface 20 in a direction orthogonal to the top surface 20. Inside the base 12, a space (inside space) IS partitioned by the top surface 20 and the side wall 22 is formed. The top surface 20 may be formed in a substantially circular shape, or may be formed in a polygonal shape. The end surface of the side wall 22 (the end surface opposite to the top surface 20) becomes a base end surface 22a facing the mounting surface FP. The reduction gear 10 is placed on the mounting surface FP so that the base end surface 22a is in contact with the mounting surface FP. In the side wall 22, an opening (first opening) 22b is formed so as to communicate the inner space IS with the outer side of the base 12. An opening (third opening) 22c through which the input shaft 14 is inserted is formed in the side wall 22. A bearing 24 is attached to the peripheral edge of the third opening 22c of the side wall 22. The input shaft 14 is rotatably supported by the side wall 22 of the base 12 via a bearing 24. The third opening 22c shown in FIG. 1 is formed at a position opposite to the first opening 22b of the side wall 22 (a position at 180 degrees). However, the third opening 22c may also be formed at other positions (for example, a position at 90 degrees relative to the first opening 22b). The principle of this embodiment is not limited to the specific formation position of the third opening 22c. On the outer end surface of the input shaft 14 is formed a press-fit hole 14a into which the drive shaft 5a of the motor 5 is inserted. The motor 5 is fixed to a motor support member 26 installed on the base 12. The drive shaft 5a of the motor 5 is inserted into the press-fit hole 14a of the input shaft 14 in a posture extending in the horizontal direction (the direction parallel to the top surface 20). The motor 5 is housed on the lower side (mounting surface FP side) than the top surface (outer surface) of the top surface part 20. A drive side gear 14b is provided at the front end of the input shaft 14. The top surface portion 20 includes: a main body portion 28 formed in a plate shape; a first convex portion 29 formed so as to protrude from the outer surface of the main body portion 28; and a second convex portion 30 formed outside the main body portion 28 The surface is prominent. The first convex portion 29 is provided on the outer peripheral portion of the main body portion 28. The first convex portion 29 is formed in a ring shape. The first convex portion 29 is used for positioning the fixing portion 42 (described later). The second convex portion 30 is provided on the periphery of the second opening 28a (described later). The second protrusion 30 is used for positioning the cylinder 64 (described later). The second convex portion 30 may be formed in a ring shape concentric with the first convex portion 29. In the main body portion 28 of the top surface portion 20, two openings 28a, 28b are formed so as to communicate the inner space IS with the outer side (upper side) of the base portion 12 on the side of the deceleration portion 16. The opening (second opening) 28a is formed in a shape concentric with the cylindrical body 64 (described later). The opening (fourth opening) 28b is formed at a position concentric with the crankshaft 52 (described later). As described later, a plurality of crankshafts 53 are provided in the reducer 10. Therefore, a plurality of fourth openings 28 b are formed in the main body 28. The base 12 is provided with a bottom 34 extending from the base end of the side wall 22 (the end on the base end surface 22a side) toward the inner side of the base 12; and a partition wall 36 which connects the inner end of the bottom 34 to the top The face 20 is connected. The bottom 34 is formed to be thicker than the top 20. The bottom part 34 is formed substantially parallel to the top face part 20. A supporting hole 34a with a circular cross-section and a bottom is formed at a position of the bottom 34 facing the fourth opening 28b. A bearing 38 is attached to this support hole 34a. The conversion shaft 15c (described later) supported by the bearing 38 is concentric with the shaft body 52a of the crankshaft 52 (described later). The bottom part 34 has a bottom body 34b, which is integrally formed with the side wall 22, and a plug part 34c, which is formed separately from the bottom body 34b and assembled to the bottom body 34b. The bottom body 34b is formed with a through hole that penetrates the bottom body 34b in a direction parallel to the side wall 22. The plug 34c plugs the end of the through hole on the mounting surface FP side (the end on the lower side in FIG. 1). Thereby, the aforementioned supporting hole 34a with a bottom is formed. As a result, the first space IS1 can be prevented from being exposed to the outside of the base 12. The bearing 38 is installed on the inner peripheral surface of the through hole. The bottom part 34 is formed only to face the first space IS1 described later. The second space IS2 (described later) is opened toward the lower side of FIG. 1 (the side opposite to the top surface 20). The partition wall 36 partitions the inner space IS into a space (first space) IS1 where the input shaft 14 is arranged, a space (second space) IS2 where the first opening 22b and the second opening 28a are opened. The first space IS1 communicates with the inside of the deceleration portion 16 through the fourth opening 28b. The second space IS2 communicates with the inside of the cylinder 64 through the second opening 28a. On the other hand, since it does not communicate with the inside of the deceleration section 16, the lubricating oil in the deceleration section 16 does not flow into the second space IS2. The conversion portion 15 includes a driven-side gear 15b that meshes with a driving-side gear 14b provided on the input shaft 14 and a conversion shaft 15c that supports the driven-side gear 15b. The conversion unit 15 converts the transmission direction of the driving force along the extension direction of the input shaft 14 into a direction along the extension direction of the conversion shaft 15c. The driving side gear 14b and the driven side gear 15b include bevel gears. The driving side gear 14b and the driven side gear 15b are not limited to bevel gears. The driving side gear 14b and the driven side gear 15b may be in a positional relationship where the rotation axis of the input shaft 14 and the rotation axis of the conversion shaft 15c intersect, and the driving force can be transmitted from the driving side gear 14b to the driven side gear 15b The gear parts. The conversion shaft 15c is concentric with the rotation shaft of the driven gear 15b. The conversion shaft 15c includes a shaft member extending linearly. The conversion shaft 15c is supported by the bearing 38 of the support hole 34a in a posture in which the rotation axis of the conversion shaft 15c is orthogonal to the rotation axis of the input shaft 14. That is, the conversion shaft 15c is rotatably supported by the bottom 34. The rotation axis of the input shaft 14 is parallel to the top surface 20. The rotation axis of the conversion axis 15c is orthogonal to the top surface 20. The principle of this embodiment is not limited to the orthogonal positional relationship between the rotation axis of the conversion shaft 15c and the rotation axis of the input shaft 14. The rotation axis of the input shaft 14 only needs to have a positional relationship other than being parallel to the rotation axis of the conversion shaft 15c. The driven side gear 15b includes a disk-shaped portion protruding in the radial direction from the outer peripheral surface of the conversion shaft 15c, and teeth formed at the outer end of the disk-shaped portion. The outer end of the disc-shaped portion enters the recess 36 a formed in the partition wall 36. Thereby, the conversion shaft 15c is arranged in the vicinity of the partition wall portion 36. The designer can design the horizontal width of the base 13 to be small. The deceleration unit 16 includes: a fixed portion 42 fixed to the base 12; an output portion 44 that is relatively rotatable with respect to the fixed portion 42; a first main bearing 46 and a second main bearing 48 that are arranged on the fixed portion 42 and the output portion 44; and the transmission portion 50, which transmits the driving force for rotating the output portion 44 from the conversion portion 15 to the output portion 44. The transmission part 50 has a crank shaft 52 which is driven by the conversion shaft 15c, and a swing gear 54 which swings in conjunction with the rotation of the crank shaft 52. During the oscillating rotation of the oscillating gear 54, the center of the oscillating gear 54 revolves around the rotation center axis of the rotating table TT. The output part 44 has an annular shape. The output portion 44 has an inner peripheral surface 44a, an outer peripheral surface 44b, a first end surface 44c, and a second end surface 44d. A fixing portion 42 is arranged on the radially inner side of the output portion 44. The first main bearing 46 and the second main bearing 48 are arranged between the inner peripheral surface 44 a of the output portion 44 and the outer peripheral surface of the fixed portion 42. The first main bearing 46 and the second main bearing 48 are arranged at intervals in the axial direction. The main bearings 46, 48 include ball bearings. As an alternative, other bearing components may also be used as the main bearings 46, 48. In the inner peripheral surface 44a of the output portion 44, a plurality of pin grooves are formed at equal intervals in the circumferential direction. The pin grooves are located between the first main bearing 46 and the second main bearing 48. An internal tooth pin 44e is arranged in each pin groove. A cylindrical member is used as the internal tooth pin 44e. The internal tooth pin 44e is parallel to the extending direction of the rotation axis of the output portion 44. That is, the output portion 44 is an annular member with internal teeth. The first end surface 44c faces the top surface 20 of the base 12. The first end surface 44c becomes the base end surface of the output portion 44. The second end surface 44d is formed on the opposite side to the first end surface 44c in the axial direction. The second end surface 44d becomes the front end surface of the output portion 44. A very small gap is formed between the first end surface 44c and the top surface 20. The fixing portion 42 is placed on the top surface 20 in contact with the outer surface of the top surface 20. The fixing part 42 is fixed to the top surface part 20 (base part 12) with the fastening tool (for example, a bolt) 58. The fixing portion 42 includes a first member 60, a second member 61, and a fastening member (for example, a bolt) 62 that fastens the first member 60 and the second member 61 to each other. The first member 60 has a substantially disc-shaped substrate portion 60a and a shaft portion 60b integrally formed with the substrate portion 60a. The second member 61 has a disc shape. The second member 61 and the base portion 60a have substantially the same size in the radial direction. One surface of the base portion 60a is arranged to face the main body portion 28 of the top surface portion 20. The substrate portion 60 a is fitted inside the first convex portion 29 of the top surface 20. As a result, the substrate portion 60a is positioned with respect to the base portion 12 (top surface portion 20). The shaft portion 60b extends from the other surface of the substrate portion 60a (the surface on the opposite side to the surface contacting the base 12) toward the second member 61. The surface of the second member 61 (the surface on the side of the substrate portion 60a) is in contact with the front end surface of the shaft portion 60b. The shaft portion 60 b and the second member 61 are fixed to each other by the fastening member 62. As shown in FIG. 2, a plurality of shaft portions 60b (three in this embodiment) are provided at positions shifted from the center in the radial direction of the substrate portion 60a at intervals in the circumferential direction. The fixing portion 42 is provided with a central through hole 42a formed at the center in the radial direction and a crank shaft mounting portion 42b formed at a position deviated from the center in the radial direction. The center through hole 42a penetrates the substrate portion 60a and the second member 61 (fixed portion 42). A cylindrical body 64 is inserted into the central through hole 42a. That is, the cylinder 64 penetrates the deceleration part 16 in the extending direction of the rotation axis of the output part 44. One end of the cylindrical body 64 is fitted into the second convex portion 30 so as to abut the inner peripheral surface of the second convex portion 30 of the top surface 20. The other end of the cylinder 64 protrudes from the second member 61. The inner space IS of the cylinder 64 passes through the second opening 28a of the top surface 20 and communicates with the second space IS2 in the base 12. The crankshaft mounting portion 42b is a part for mounting the crankshaft 52. The crank shaft attachment portion 42b is a through hole that penetrates the base plate portion 60a and the second member 61 in a direction parallel to the central through hole 42a. A crank bearing 66 is arranged on the crank shaft attachment portion 42b. The crank shaft 52 is rotatably supported by the fixed portion 42 via a crank bearing 66. The crankshaft 52 includes a shaft body 52a extending straight, and an eccentric portion 52b that is eccentric with respect to the shaft body 52a. A crank bearing 66 is attached to the shaft body 52a. The crankshaft 52 has a plurality of eccentric portions 52b (Figure 1 shows two eccentric portions 52b). The number of eccentric portions 52b is set to correspond to the number of swing gears 54 (described later). The shaft body 52a of the crankshaft 52 is fixed to the conversion shaft 15c in a state where it is arranged concentrically with the conversion shaft 15c. Therefore, the crankshaft 52 rotates by the rotation of the conversion shaft 15c. As shown in FIG. 1, a gap is formed between the second member 61 and the substrate portion 60a. A swing gear 54 is arranged in this gap. The swing gear 54 is attached to the eccentric portion 52b in a state where a roller bearing is inserted and attached. The swing gear 54 includes an external gear having external teeth. The swing gear 54 meshes with the internal tooth pin 44e of the output portion 44. The number of outer teeth of the oscillating gear 54 is slightly less than the number of the inner tooth pin 44e. Regarding the present embodiment, a plurality of swing gears 54 (two swing gears 54 are shown in FIG. 1) are provided in the transmission part 50. However, there may be one swing gear 54 or three or more. The swing gear 54 is formed with a central through hole 54a formed in the center portion, a first through hole 54b through which the crankshaft 52 is inserted, and a second through hole 54c through which the shaft 60b is inserted. The first insertion holes 54b and the second insertion holes 54c are alternately arranged around the center through hole 54a. The turntable support portion 18 is integrally formed on the outer peripheral surface 44 b of the output portion 44. The turntable support portion 18 is formed in a flange shape protruding from the outer peripheral surface 44b toward the outer side in the radial direction. That is, the turntable support portion 18 has a flat plate shape extending in a direction orthogonal to the rotation axis of the output portion 44. The turntable support portion 18 is formed on the outer peripheral surface 44b of the output portion 44 at a position close to the first end surface 44c. That is, the outer peripheral surface 44b of the output portion 44 includes a portion closer to the first end surface 44c than the turntable support portion 18 and a portion closer to the second end surface 44d than the turntable support portion 18. The axial length of the portion of the outer circumferential surface 44b close to the first end surface 44c is shorter than the axial length of the portion of the outer circumferential surface 44b close to the second end surface 44d. Therefore, the upper surface 18a of the turntable support portion 18 is formed between the first end surface 44c and the second end surface 44d at a position closer to the first end surface 44c than the second end surface 44d. Thereby, the rotating table TT supported by the rotating table supporting part 18 is arranged in a low position. The upper surface 18 a of the turntable support portion 18 is located between the first main bearing 46 and the second main bearing 48 in the extending direction of the rotation axis of the output portion 44. Therefore, the extension line TL of the turntable TT supported by the turntable support portion 18 passes between the first main bearing 46 and the second main bearing 48. The extension line TL of the rotating table TT also overlaps with the swing gear 54. The turntable support portion 18 is provided with a fixing hole for fixing the fastening bolt 68 that fixes the turntable TT. The fixing holes are threaded holes. The reducer 10 is provided with a resin casing 70 covering the speed reducing portion 16. The housing 70 has: a disc-shaped flat plate portion 70a; a first protruding portion 70b protruding from the outer periphery of the flat plate portion 70a toward the extension direction of the rotation axis of the output portion 44; and a second protruding portion 70c at the output portion In the extending direction of the rotating shaft of 44, it protrudes from the peripheral edge of the inner hole formed in the center part of the flat plate part 70a to the side opposite to the 1st protrusion part 70b. The first protrusion 70b is fixed to the second end surface 44d of the output portion 44. The end of the cylinder 64 is inserted into the inner hole of the housing 70. The end of the cylinder 64 is exposed on the upper side of the housing 70 through the inner hole. Between the inner peripheral surface of the second protrusion 70c and the outer peripheral surface of the cylindrical body 64, a sealing member is arranged. A sealing member is also arranged between the output portion 44 and the substrate portion 60a. Therefore, the lubricating oil in the deceleration portion 16 does not leak to the outside. The input shaft 14 is arranged on the base end surface 22 a side of the base 12 with respect to the turntable support 18. The input shaft 14 is arranged between the base end surface 22 a of the base 12 and the turntable support 18. The rotation axis of the input shaft 14 and the rotation axis of the output portion 44 are orthogonal. The rotating shaft of the input shaft 14 is parallel to the rotating table support 18. The input shaft 14 is arranged at a position closer to the base end surface 22 a of the base portion 12 than the front end surface (upper end surface) of the output portion 44. That is, the distance D1 between the rotation axis of the input shaft 14 and the base end surface 22a is smaller than the distance D2 between the rotation axis of the input shaft 14 and the front end surface of the output portion 44. The input shaft 14 is configured such that the distance D3 between the rotating shaft of the input shaft 14 and the lower surface of the rotating table support 18 is smaller than the distance D1 between the rotating shaft of the input shaft 14 and the base end surface 22a. The motor 5 has a size to be accommodated on the lower side of the lower surface 18b of the rotating table support 18. That is, the motor 5 is housed at a lower side than the plane including the lower surface 18b of the turntable support portion 18. Therefore, the flat rotating table TT and the motor 5 will not interfere. The reducer 10 of this embodiment is fixed to the flat mounting surface FP. In this state, the turntable TT is placed on the upper surface 18a of the turntable support portion 18. The turntable TT is fixed to the turntable support part 18 by a fastening bolt 68. Regarding the rotating device 1 having the reducer 10, if the motor 5 is driven, the input shaft 14 of the reducer 10 will rotate. Thereby, the driven side gear 15b meshing with the driving side gear 14b provided in the input shaft 14 is driven, and the conversion shaft 15c of the conversion part 15 rotates around an axis. When the crankshaft 52 coupled with the conversion shaft 15c rotates, the swing gear 54 will revolve while changing the meshing position in accordance with the rotation of the eccentric portion 52b. At this time, the swing gear 54 rotates slowly. Along with the swing of the swing gear 54, the output portion 44 relatively rotates with respect to the fixed portion 42. Thereby, the turntable TT rotates. As described above, the turntable support portion 18 is formed on the outer peripheral surface 44 b of the output portion 44 of the deceleration portion 16. Therefore, compared with the configuration in which the rotating table TT is mounted on the end surface (front end surface) of the output portion 44, the operator can fix the rotating table TT at a position close to the mounting surface FP to which the base 12 is fixed. That is, in a state where the output portion 44 is inserted through the insertion hole formed in the turntable TT, the turntable TT is fixed to the turntable support portion 18. The end surface (front end surface) of the output portion 44 protrudes from the turntable TT. The turntable TT is located far away from the end surface of the output portion 44, and the distance is the protrusion amount of the end surface of the output portion 44. Therefore, if the speed reducer 10 for a turntable in which the turntable TT is attached to the turntable support part 18 is mounted on the mounting surface FP, the turntable TT will be arrange|positioned at a low position. Since the input shaft 14 is arranged between the base end surface 22a and the turntable support portion 18, the designer can reduce the deceleration compared with the configuration in which the input shaft 14 is arranged on the radially outer side of the turntable support portion 18 The radial dimension of machine 10. The input shaft 14 is arranged at a position closer to the mounting surface FP. On the other hand, between the input shaft 14 and the mounting surface FP, a space for arranging members for rotatably supporting the input shaft 14 is secured. Since the turntable support part 18 is arranged at a position close to the input shaft 14, the distance between the turntable support part 18 and the mounting surface FP becomes shorter. Therefore, the turntable TT is arranged in a low position. The operator can introduce the wiring located on the mounting surface FP side with respect to the turntable TT into the cylinder 64 through the first opening 22b, the inner space IS of the base 12, and the second opening 28a. Since the cylinder 64 penetrates the deceleration part 16, the operator can lead the wiring introduced into the inside of the cylinder 64 from the deceleration part 16. As a result, the operator can lead it to the opposite side of the rotating table TT and the mounting surface FP. The extension line TL of the rotating table TT passes between the first main bearing 46 and the second main bearing 48. Therefore, it is possible to prevent the load received by the turntable support portion 18 from the turntable TT from being applied (overhang) to the outside of the first and second main bearings 46 and 48. As a result, the driving force transmission efficiency between the fixed portion 42 and the output portion 44 is improved. Therefore, the driving force necessary to rotate the turntable TT is reduced. Since the swing gear 54 is located on the extension line TL of the rotating table TT, the swing gear 54 is located on the line of action of the force from the rotating table TT. As a result, the driving force transmission efficiency between the fixed portion 42 and the output portion 44 is improved. Therefore, the driving force necessary to rotate the turntable TT is reduced. In addition, the present invention is not limited to the aforementioned embodiment, and various changes, improvements, etc. can be made without departing from the scope of the gist. Regarding the above-mentioned embodiment, the cylindrical body 64 penetrates the central part of the deceleration part 16, and the plurality of crankshafts 52 are arranged around the cylindrical body 64. Alternatively, the speed reduction portion 16 may be constituted by a center crank type eccentric swing type speed reducer 10. In this case, the cylinder 64 is omitted, and the crank shaft 52 is arranged at the radial center of the fixed portion 42. A swing gear 54 is attached to the eccentric portion 52 b of the crank shaft 52. A plurality of shaft portions 60b are arranged around the crankshaft 52. Regarding the above-mentioned embodiment, the speed reducer 10 is constituted by an eccentric swing type gear device. Alternatively, instead of the crankshaft 52, the conversion portion 15 may be connected to the sun gear (not shown). By the rotation of the sun gear, the planetary gear (not shown) revolves, and the output part 44 including the internal gear rotates. Regarding the aforementioned embodiment, the input shaft 14 is arranged between the turntable support portion 18 and the base end surface 22 a of the side wall 22. Alternatively, the input shaft 14 may also be arranged at a position that is more radially outward than this position. Regarding the aforementioned embodiment, the distance D3 between the rotation axis of the input shaft 14 and the lower surface 18b of the turntable support 18 is smaller than the distance D1 between the rotation axis of the input shaft 14 and the base end surface 22a. As an alternative, the distance D3 may be greater than the distance D1. Regarding the above-mentioned embodiment, the speed reducer 10 is mounted on the mounting surface FP extending in the horizontal direction. As an alternative, the reducer 10 may also be fixed to a mounting surface for the reducer 10 extending in a direction other than horizontal. The reducer for a turntable described in connection with the above-mentioned embodiment mainly has the following characteristics. The reducer for a rotary table according to one aspect of the above-mentioned embodiment includes: a base; an input shaft that is rotatably supported by the base so as to receive the driving force of the motor and rotate around the shaft; and a conversion part that inputs the input The direction of the axis of rotation of the shaft is transformed into a different direction; the deceleration part has a fixed part held on the base part, and can rotate relative to the fixed part and rotate at the number of rotations reduced from the number of rotations of the conversion part The output portion; and the turntable support portion, which is formed in a manner protruding from the outer peripheral surface of the output portion toward the outer side in the radial direction. According to the above configuration, the turntable support part is formed on the outer peripheral surface of the output part of the speed reduction part. Therefore, compared with the configuration in which the rotating table is installed on the end surface (front end surface) of the output part, the operator can fix the rotating table at a position close to the mounting surface where the base is fixed. That is, in a state where the output part is inserted through the insertion hole formed in the rotating table, the rotating table is fixed to the rotating table supporting part. As a result, the end surface (front end surface) of the output portion protrudes from the rotating table. The rotating table is located far away from the end surface of the output part, and its distance is the protrusion amount of the end surface of the output part. Therefore, if the speed reducer for a turntable in which the turntable is attached to the turntable support part is placed on the mounting surface, the turntable is arranged in a low position. Regarding the above configuration, the aforementioned base may have a base end surface facing the mounting surface. The input shaft may be arranged at a position between the base end surface and the turntable support part. According to the above configuration, the designer can reduce the size of the reducer in the radial direction compared to the configuration in which the input shaft is arranged on the radially outer side of the rotating table support portion. Regarding the above-mentioned structure, the input shaft may be arranged at a position closer to the base end surface of the base than the front end surface of the output part, and the distance between the rotating shaft and the rotating table support part may be longer than that between the rotating shaft and the The distance between the base end faces is small. According to the above-mentioned configuration, the input shaft is arranged closer to the mounting surface. On the other hand, between the input shaft and the mounting surface, there is a space for arranging members for rotatably supporting the input shaft. If the rotating table supporting part is arranged close to the input shaft, the distance between the rotating table supporting part and the mounting surface becomes shorter. Therefore, the rotating table is arranged in a low position. Regarding the above-mentioned structure, a cylindrical body penetrating the fixing part may be provided in the speed reduction part. A first opening and a second opening may be formed in the aforementioned base. A space that communicates with the outer side of the base through the first opening and communicates with the inside of the cylinder through the second opening may be formed inside the base. According to the above configuration, the operator can introduce the wiring located on the mounting surface side with respect to the rotating table into the cylinder through the first opening, the space, and the second opening. Since the cylinder passes through the deceleration part, the operator can lead the wiring introduced to the inside of the cylinder from the deceleration part. As a result, the operator can pull it out toward the opposite side of the rotating table and the mounting surface. Regarding the above-mentioned structure, a first main bearing and a second main bearing may be arranged between the output portion and the fixed portion. The turntable support part may be provided such that an extension of the turntable supported by the turntable support part passes between the first main bearing and the second main bearing. According to the above configuration, it is possible to prevent the load received by the rotating table support from the rotating table from being applied (overhang) to the outside of the first and second main bearings. As a result, the driving force transmission efficiency between the fixed portion and the output portion is improved. Therefore, the driving force necessary to rotate the turntable is reduced. Regarding the above-mentioned structure, the aforementioned speed reduction portion may have a swing gear. The swing gear may be located on an extension line of the rotating table supported by the rotating table supporting part. According to the above configuration, since the swing gear is located on the extension line of the rotating table, the swing gear is located on the line of force. As a result, the driving force transmission efficiency between the fixed portion and the output portion is improved. Therefore, the driving force necessary to rotate the turntable is reduced. Regarding the above-mentioned structure, the speed reducer for a turntable may have a housing covering the speed reduction part. The aforementioned case may be made of resin. According to the above configuration, the deceleration part is protected by the housing. Since the housing is made of resin, the reducer for the turntable does not become too heavy. [Industrial Applicability] The principles of the above-mentioned embodiments can be used in the design of various rotating tables.

1‧‧‧Rotating device 5‧‧‧Motor 5a‧‧‧Drive shaft 10‧‧‧Reducer for rotary table 12‧‧‧Base 14‧‧‧Input shaft 14a‧‧‧Press-in hole 14b‧‧‧Drive side gear 15‧‧‧Transformation Department 15b‧‧‧Driven side gear 15c‧‧‧change axis 16‧‧‧Deceleration Department 18‧‧‧Rotating table support 18a‧‧‧Upper surface 18b‧‧‧Lower surface 20‧‧‧Top face 22‧‧‧Wall 22a‧‧‧Base end surface 22b‧‧‧First opening 22c‧‧‧The third opening 24‧‧‧Bearing 26‧‧‧Motor support member 28‧‧‧Main body 28a‧‧‧Second opening 28b‧‧‧4th opening 29‧‧‧The first convex part 30‧‧‧Second convex part 34‧‧‧Bottom 34a‧‧‧Support hole 34b‧‧‧Bottom body 34c‧‧‧Suppository 36‧‧‧Partition wall 36a‧‧‧Concave 38‧‧‧Bearing 42‧‧‧Fixed part 42a‧‧‧Central through hole 42b‧‧‧Crankshaft mounting part 44‧‧‧Output 44a‧‧‧Inner peripheral surface 44b‧‧‧Outer peripheral surface 44c‧‧‧First end face 44d‧‧‧Second end face 44e‧‧‧Internal tooth pin 46‧‧‧The first main bearing 48‧‧‧Second main bearing 50‧‧‧Delivery Department 52‧‧‧Crankshaft 52a‧‧‧Shaft body 52b‧‧‧Eccentric part 54‧‧‧Swing gear 54a‧‧‧Central through hole 54b‧‧‧First through hole 54c‧‧‧Second through hole 58‧‧‧ Fastening Tools 60‧‧‧The first member 60a‧‧‧Substrate 60b‧‧‧Shaft 61‧‧‧Second member 62‧‧‧fastening member 64‧‧‧Cylinder 66‧‧‧Crank bearing 68‧‧‧Tightening bolt 70‧‧‧Shell 70a‧‧‧Plate part 70b‧‧‧The first protrusion 70c‧‧‧Second protrusion 101‧‧‧Input shaft 102‧‧‧Transformation part 103‧‧‧Deceleration Department 104‧‧‧Crankshaft 105‧‧‧Pedest 106‧‧‧Shell 107‧‧‧Carrier 108‧‧‧Bearing D1‧‧‧Distance D2‧‧‧Distance D3‧‧‧Distance FP‧‧‧Mounting surface IS‧‧‧Space (Inner Space) IS1‧‧‧First Space IS2‧‧‧Second Space TL‧‧‧Rotary table TT extension cable TT‧‧‧Rotating table

Fig. 1 is a schematic cross-sectional view of an exemplary speed reducer for a rotating table. Fig. 2 is a cross-sectional view taken along line II-II of Fig. 1; Figure 3 is a schematic cross-sectional view of the previous reducer.

1‧‧‧Rotating device

5‧‧‧Motor

5a‧‧‧Drive shaft

10‧‧‧Reducer for rotary table

12‧‧‧Base

14‧‧‧Input shaft

14a‧‧‧Press-in hole

14b‧‧‧Drive side gear

15‧‧‧Transformation Department

15b‧‧‧Driven side gear

15c‧‧‧change axis

16‧‧‧Deceleration Department

18‧‧‧Rotating table support

18a‧‧‧Upper surface

18b‧‧‧Lower surface

20‧‧‧Top face

22‧‧‧Wall

22a‧‧‧Base end surface

22b‧‧‧First opening

22c‧‧‧The third opening

24‧‧‧Bearing

26‧‧‧Motor support member

28‧‧‧Main body

28a‧‧‧Second opening

28b‧‧‧4th opening

29‧‧‧The first convex part

30‧‧‧Second convex part

34‧‧‧Bottom

34a‧‧‧Support hole

34b‧‧‧Bottom body

34c‧‧‧Suppository

36‧‧‧Partition wall

36a‧‧‧Concave

38‧‧‧Bearing

42‧‧‧Fixed part

42a‧‧‧Central through hole

42b‧‧‧Crankshaft mounting part

44‧‧‧Output

44a‧‧‧Inner peripheral surface

44b‧‧‧Outer peripheral surface

44c‧‧‧First end face

44d‧‧‧Second end face

44e‧‧‧Internal tooth pin

46‧‧‧The first main bearing

48‧‧‧Second main bearing

50‧‧‧Delivery Department

52‧‧‧Crankshaft

52a‧‧‧Shaft body

52b‧‧‧Eccentric part

54‧‧‧Swing gear

54a‧‧‧Central through hole

54b‧‧‧First through hole

54c‧‧‧Second through hole

58‧‧‧ Fastening Tools

60‧‧‧The first member

60a‧‧‧Substrate

60b‧‧‧Shaft

61‧‧‧Second member

62‧‧‧fastening member

64‧‧‧Cylinder

66‧‧‧Crank bearing

68‧‧‧Tightening bolt

70‧‧‧Shell

70a‧‧‧Plate part

70b‧‧‧The first protrusion

70c‧‧‧Second protrusion

D1‧‧‧Distance

D2‧‧‧Distance

D3‧‧‧Distance

FP‧‧‧Mounting surface

IS‧‧‧Space (Inner Space)

IS1‧‧‧First Space

IS2‧‧‧Second Space

TL‧‧‧Rotary table TT extension cable

TT‧‧‧Rotating table

Claims (6)

A speed reducer for a rotating table, comprising: a base; an input shaft that is rotatably supported by the base by receiving the driving force of a motor to rotate around the shaft; and a conversion part that converts the direction of the rotation axis of the input shaft It is a different direction; a deceleration part, which has a fixed part held on the base part, and an output part that can rotate relative to the fixed part and rotates at the number of rotations after the number of rotations of the conversion part is reduced; the rotating table supports Part, which is formed to protrude from the outer peripheral surface of the output part toward the outer side in the radial direction; and the first main bearing and the second main bearing are arranged between the output part and the fixed part; and the rotating table supports The part system is arranged in such a way that the extension line of the rotating table supported by the rotating table supporting part passes between the first main bearing and the second main bearing. The reducer for a rotary table according to claim 1, wherein the base has a base end surface facing the mounting surface of the reducer, and the input shaft is arranged at a position between the base end surface and the support portion of the rotary table. The reducer for a rotating table of claim 2, wherein the input shaft is arranged at a position closer to the base end surface of the base than the front end surface of the output portion, and is arranged between the rotating shaft and the rotating table support The distance is smaller than the distance between the rotation axis and the base end surface. The speed reducer for a rotating table of claim 2, wherein the speed reduction part is provided with a cylindrical body penetrating the fixed part, a first opening and a second opening are formed in the base part, and the second opening is formed inside the base part. 1 A space in which the opening communicates with the outer side of the base and communicates with the inside of the cylindrical body through the second opening. The speed reducer for a rotating table according to claim 1, wherein the speed reducing part has a swing gear, and the swing gear train is located on an extension line of the rotating table supported by the rotating table supporting part. The reducer for a rotating table according to claim 1, which includes a housing covering the reduction section, and the housing is made of resin.

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