JP2016008670A - Method for assembling friction fastening device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for fastening rigidly a rotary shaft and a pulley that can be operated only by a general purpose tool.SOLUTION: This invention relates to a method for assembling a friction fastening device comprising a rotary shaft 5, a bushing 4 outwardly fitted to the rotary shaft 5 and having a tapered outer diameter part and a disc body 2 fixed to the rotary shaft 5 through the pulley 3 and having a larger outer diameter than that of the pulley 3, in which the bushing 4 and the pulley 3 are fastened by bolts 7. A unit having the disc body 2 fixed to the pulley 3 is assembled and after this assembly, the bushing 4 is fitted between an inner diameter part of the pulley 3 and an outer circumferential surface of the rotary shaft 5, the bushing 4 and the pulley 3 are fastened by bolts 7 while preventing rotation of the disc body 2, thereby the assembled unit is fastened in friction to the rotary shaft 5 through the bushing 4.

Description

  The present invention relates to a method for fastening a rotating shaft and a rotating body.

  2. Description of the Related Art Some escalators that are passenger conveyors and moving sidewalk drive devices have a flywheel for transmitting the power of an electric motor to a speed reducer by means of a belt and a pulley and adjusting acceleration during deceleration. As such a driving device, a driving device for a conveyor described in Japanese Patent Laid-Open No. 6-92579 (Patent Document 1) is known. In this conveyor drive device, a tread chain that drives a tread is coupled to the drive chain via a tread plate chain sprocket and a drive chain sprocket, and the drive chain is wound around the drive sprocket of the speed reducer. Further, a driving pulley is fixed to the rotating shaft of the electric motor, and a V-belt is wound around the driving pulley and a driven pulley of the speed reducer. The power of the motor is transmitted to the driven pulley of the speed reducer via the drive pulley and the V belt, and further transmitted to the treadle chain sprocket via the drive sprocket, the drive chain and the drive chain sprocket of the speed reducer to drive the treadle chain. Is done. In this conveyor drive device, the flywheel is fixed to the rotating shaft of the motor together with the drive pulley (see paragraphs 0017 to 0019).

  In such a drive device, in order to reliably transmit power from the rotating shaft of the electric motor to the driving pulley, it is necessary to firmly fix the sliding shaft so that no slip occurs between the rotating shaft and the driving pulley. The flywheel is preferably mounted concentrically with the rotating shaft in order to prevent unbalance during rotation.

  As one of the fixing methods, there is a shrink fit that heats the pulley, expands the inner diameter and attaches it to the rotating shaft, but cannot work in a place where it is difficult to use fire, or it is difficult to remove after cooling the pulley. There were work issues.

  Further, as a fixing method not using fire, there is a fastening method using a wedge effect by a tapered bush and a boss. As an example of adopting this fastening method, a rotating body fastening device described in Japanese Utility Model Laid-Open No. 4-63820 (Patent Document 2) is known. This fastening device has an outer ring, an inner ring, and a bolt. The outer ring has a cylindrical shape in which a cylindrical outer peripheral surface and a tapered inner peripheral surface having a diameter several tens of microns smaller than the inner diameter of the boss hole of the rotating body are formed, and has a slit penetrating in the axial direction. On the other hand, the inner ring is formed on the cylindrical inner peripheral surface having a diameter several tens of microns larger than the shaft diameter, the tapered outer peripheral surface that complements the tapered inner peripheral surface of the outer ring, and the large-diameter end of the tapered outer peripheral surface. And a plurality of slits formed in the axial direction. In this fastening device, the outer ring and the rotating body form a tapered shape on the boss side, and the inner ring is configured as a bush. The diameter-enlarged flange portion of the inner ring is formed with an axial hole through which a bolt can be inserted and a disassembling screw (tap) hole. In this fastening device, by tightening the bolt with a predetermined tightening torque, between the outer peripheral surface of the rotating shaft and the cylindrical inner peripheral surface of the inner ring, the inner peripheral surface of the boss hole of the rotating body and the cylindrical outer peripheral surface of the outer ring And a tightening force due to the wedge effect is generated between the inner peripheral surface and the tapered outer peripheral surface of the inner ring and the tapered inner peripheral surface of the outer ring, and acts as a surface pressure. The rotating shaft and the rotating body are firmly fastened by this surface pressure, and torque is transmitted by the frictional force.

JP-A-6-92579 Japanese Utility Model Publication No. 4-63820

  In the fastening method of Patent Document 2, when the rotating shaft is not fixed, if torque is applied to the bolt during fastening, the rotating shaft, bush (inner ring), and boss (outer ring and rotating body) rotate together, which is necessary for fixing. There is a problem that it is difficult to apply a proper torque.

  Further, in order to fix the rotating shaft, it is necessary to attach a fixing for preventing rotation, and there is a problem that it is difficult to fasten the rotating shaft, the bush and the boss with only a general-purpose tool.

  The objective of this invention is providing the fixing method of the rotating shaft and pulley which can be attached and removed only with a general purpose tool, without using fire.

  In order to achieve the above object, in the method of assembling the friction fastening device of the present invention, a rotating shaft, a bush having a tapered outer diameter portion fitted on the rotating shaft, and a tapered shape fitting on the bush. Friction composed of a pulley having an inner diameter part and a disc body fixed to the rotating shaft via the pulley and having an outer diameter larger than the outer diameter of the pulley, and the bush and the pulley are fastened by a bolt In the assembly method of the fastening device, an assembly in which the disc body is fixed to the pulley is assembled, and the bush is fitted between the inner diameter portion of the pulley and the outer peripheral surface of the rotating shaft after the assembly of the assembly. Then, by fastening the bush and the pulley with the bolt while preventing the disk body from rotating, the assembly is frictionally fastened to the rotating shaft via the bush.

  According to the present invention, by using a disk body having a diameter larger than the outer diameter of the pulley as a fixture for preventing pulley rotation, it is possible to prevent the pulley from rotating together during bolt fastening. Thereby, when fixing a rotating shaft, a bush, and a pulley, it can work only with a general-purpose tool, without using fire, and workability | operativity can be improved. Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is sectional drawing which shows the structure of the fastening apparatus of Example 1 which concerns on this invention. It is explanatory drawing of the assembly process of the fastening apparatus of Example 1 which concerns on this invention, and is sectional drawing which shows the process of assembling a pulley and a flywheel. It is explanatory drawing of the assembly process of the fastening apparatus of Example 1 which concerns on this invention, and is sectional drawing which shows the process of assembling the assembly of a pulley and a flywheel to a rotating shaft. It is explanatory drawing of the assembly process of the fastening apparatus of Example 1 which concerns on this invention, and is sectional drawing which shows the process of inserting the bush between a pulley and a rotating shaft, and generating the fastening force by a wedge effect. BRIEF DESCRIPTION OF THE DRAWINGS It is a front view (III arrow directional view of FIG. 1) which shows the structure of the fastening apparatus of Example 1 which concerns on this invention. It is a front view (IV arrow line view of FIG. 2A) of the flywheel which comprises the fastening apparatus of Example 1 which concerns on this invention. It is a bush front view (V arrow line view of FIG. 2A) of Example 1 which concerns on this invention. It is a front view (figure equivalent to the IV arrow line view of Drawing 2A) of the flywheel of Example 2 concerning the present invention. It is sectional drawing of the pulley of Example 3 which concerns on this invention. It is sectional drawing which shows the structure of the fastening apparatus of Example 4 which concerns on this invention. It is explanatory drawing of the assembly process of the fastening apparatus of Example 4 in this invention, and is a figure which shows the process of assembling a pulley and a flywheel. It is explanatory drawing of the assembly process of the fastening apparatus of Example 4 which concerns on this invention, and is a figure which shows the process of inserting a bush between a pulley and a rotating shaft, and generating the fastening force by a wedge effect.

  Examples according to the present invention will be described below.

  Hereinafter, an embodiment of a pulley assembly (fastening device) according to the present invention will be described with reference to FIGS. FIG. 1 is a view showing a cross section of a pulley assembly (fastening device) 1 in the present embodiment. FIG. 2A is an explanatory diagram of an assembly process of the pulley assembly 1 in the present embodiment, and is a cross-sectional view illustrating a process of assembling the pulley 3 and the flywheel 2. FIG. 2B is an explanatory diagram of an assembly process of the pulley assembly 1 in the present embodiment, and is a cross-sectional view showing a process of assembling the assembly 100 of the pulley 3 and the flywheel 2 to the rotating shaft 5. FIG. 2C is an explanatory view of the assembly process of the pulley assembly 1 of the present embodiment, and is a cross-sectional view showing a process of generating a frictional fastening force by inserting a bush between the pulley 3 and the rotating shaft 5 by a wedge effect. It is. FIG. 3 is a front view of the pulley assembly 1 in the present embodiment, and is a view taken in the direction of arrow III in FIG. FIG. 4 is a front view of the flywheel 2 in the present embodiment, and is a view taken along arrow IV in FIG. 2A. FIG. 5 is a front view of the bush 4 in the present embodiment, and is a view taken along the arrow V in FIG. 2A. 2A, 2B, and 2C are cross sections that include the center of the rotation shaft 5 and are parallel to the center of the rotation shaft 5.

  As shown in FIG. 1, a pulley assembly (friction fastening device) 1 according to the present embodiment includes a flywheel 2, a pulley 3, a bush 4, a rotating shaft 5, and bolts 6 and 7. In addition, the rotating shaft 5 is comprised by the rotating shaft of an electric motor, for example.

  As shown in FIG. 4, the flywheel 2 is a disc body in which a pulley mounting drill hole 21, a pulley removing tap hole 22, and a pulley fitting portion 23 are formed. In addition, the outer diameter of the flywheel 2 is larger than the outer diameter of the pulley 3 mentioned later. The pulley fitting portion 23 is formed as a recess having a cylindrical inner peripheral surface on one disk surface 2a of the flywheel 2, and a pulley mounting hole 21 and a pulley removing tap hole 22 are formed on the bottom surface of the recess. It is formed in the axial direction of the rotating shaft 5. A through-hole 27 through which the rotation shaft 5 is inserted is formed at the center of the bottom surface of the recess. The pulley mounting drill hole 21 is formed as a through hole penetrating from the bottom surface of the recess to the other disk surface 2 b of the flywheel 2. A plurality (four in this embodiment) of pulley mounting drill holes 21 are provided around the through hole 27 so as to be equally spaced in the circumferential direction. Further, the pulley removing tap hole 22 is formed as a through hole (screw hole, screw hole) having a spiral groove penetrating from the bottom surface of the recess to the other disk surface 2b of the flywheel 2 and having an inner circumferential surface. . A plurality of (two in this embodiment) pulley removal tap holes 22 are provided around the through hole 27 so as to be symmetrically disposed across the center of the flywheel 2. When the rotating shaft 5 is composed of a rotating shaft of an electric motor, one disk surface 2a on which the pulley fitting portion 23 is formed is directed to the side opposite to the electric motor body side and is a disk surface perpendicular to the rotating shaft 5. The other disk surface 2 b is a disk surface that faces the main body side of the electric motor and is perpendicular to the rotating shaft 5. Moreover, when the flywheel 2 and the pulley 3 are assembled | attached to the rotating shaft 5, the flywheel 2 is externally fitted by the rotating shaft 5 from the other disk surface 2b side.

  As shown in FIG. 2A, the pulley 3 has a boss portion 31, a flywheel mounting tap hole 32, a bush mounting tap hole 33, a taper portion 34, and a belt groove 35. The boss portion 31 is a portion that is fitted into the pulley fitting portion 23 of the flywheel 2 and is formed to form a cylindrical surface (circumferential surface). The flywheel mounting tap hole 32 is formed as a bag hole (screw hole, screw hole) having a spiral groove on the inner peripheral surface on the end surface 3a on the side where the flywheel 2 is mounted. The bush mounting tap hole 33 is formed as a bag hole (screw hole, screw hole) having a spiral groove on the inner peripheral surface on the end surface 3b opposite to the end surface 3a. A through-hole penetrating in the axial direction of the pulley 3 is formed in the central portion of the pulley 3 from the end surface 3a to the end surface 3b. The through hole has a diameter on the end surface 3 b side larger than a diameter on the end surface 3 a side, and forms a taper portion (inner diameter portion) 34 in a taper shape in the axial direction of the pulley 3. That is, the tapered portion 34 is configured by the inner peripheral surface of the pulley 3. A plurality of flywheel mounting tap holes 32 are provided at equal intervals in the circumferential direction around the opening of the through hole constituting the tapered portion 34 corresponding to the position of the pulley mounting drill hole 21 in FIG. 4 in the embodiment). A plurality of bush mounting tap holes 33 are provided at equal intervals in the circumferential direction around the opening of the through hole constituting the tapered portion 34 corresponding to the position of a pulley mounting drill hole 41 in FIG. In the present embodiment, four) are provided. The belt groove 35 is formed on the outer peripheral surface of the pulley 3 on the end surface 3 b side with respect to the boss portion 31. The pulley 3 has a tap hole 32 at a position on the inner side (center side) of the belt groove 35 in the radial direction of the end surface 3 a that contacts the flywheel 2.

  As shown in FIG. 5, the bush 4 has a pulley mounting drill hole 41, a pulley removing tap hole 42, and a slit 44. Further, as shown in FIG. 2B, the bush 4 is formed with a flange portion (flange portion) 45, a taper portion 43, and a through hole 46. The flange 45 is provided on the end face 4 b side of the bush 4. A pulley mounting drill hole 41 and a pulley removing tap hole 42 are provided in the flange 45. The pulley mounting drill hole 41 is formed as a through hole penetrating from one end face 4 b to the other end face 47 of the flange 45. A plurality (four in this embodiment) of pulley mounting drill holes 41 are provided around the through hole 46 so as to be equally spaced in the circumferential direction. Further, the pulley removing tap hole 42 is formed as a through hole (screw hole, screw hole) having a spiral groove on the inner peripheral surface thereof penetrating from one end surface 4b of the flange 45 to the other end surface 47. Plural (two in this embodiment) pulley removal tap holes 42 are provided around the through hole 46 so as to be symmetrically arranged with respect to the center of the bush 4. The tapered portion 43 constitutes an outer peripheral surface (outer diameter portion) whose diameter decreases from the end surface 47 opposite to the end surface 4b side of the flange portion 45 toward the end surface 4a side. The inner diameter of the through hole 46 is a constant size from the end surface 4 a to the end surface 4 b and is slightly larger than the outer diameter of the rotating shaft 5.

  The pulley assembly 1 of the present embodiment includes a rotating shaft 5, a bush 4 that is externally fitted to the rotating shaft 5 and has a tapered outer diameter portion 43, and a pulley that is externally fitted to the bush 4 and has a tapered inner diameter portion 34. 3 and a disc body 2 that is fixed to the rotary shaft 5 via the pulley 3 and has an outer diameter larger than the outer diameter of the pulley 3, and the bush 4 and the pulley 3 are fastened by a bolt 7. . Hereinafter, a method for assembling the pulley assembly 1 will be described.

  The assembly method (assembly method) of the pulley assembly 1 will be described in the procedure from the first step to the third step. By this procedure, the pulley assembly 1 is assembled as shown in FIGS. 2A, 2B, and 2C.

  In the first step, as shown in FIG. 2A, the fitting portion 23 of the flywheel 2 is inserted into the boss portion 31 of the pulley 3, and the pulley mounting hole 21 of the flywheel 2 and the flywheel of the pulley 3 are inserted. The mounting tap holes 32 are aligned and fastened with bolts 6. At this time, the gap between the boss part 31 and the fitting part 23 is set to a very small size, so that the deviation of the rotation center between the flywheel 2 and the pulley 3 is reduced. In this embodiment, the bolt 6 is assembled to the flywheel 2 from the side opposite to the pulley 3. At this time, the bolt 6 is inserted into the pulley mounting drill hole 21 of the flywheel 2 and screwed into the flywheel mounting tap hole 32 of the end surface 3a of the pulley 3 that comes into contact with the flywheel 2. The pulley 3 is fastened and fixed. The bolt 6 is screwed into the flywheel mounting tap hole 32 of the pulley 3 on the inner side of the belt groove 35 in the radial direction of the pulley 3. By this first step, the end surface 3a of the pulley 3 comes into contact with the bottom surface of the fitting portion 23 of the flywheel 2, and the flywheel 2 and the pulley 3 are assembled into an assembly 100 as shown in the center of FIG. 2B. Assembled. In this embodiment, the pulley 3 is fixed to the flywheel 2 by abutting the end surface 3 a opposite to the end surface 3 b having the tap holes 33 against the flywheel (disk body) 2.

  In the second step, as shown in FIG. 2B, the rotary shaft 5 is inserted through the through hole 27 and the tapered portion (through hole) 34 formed in the assembly 100 of the flywheel 2 and the pulley 3 fastened in the first step. In this state, the bush 4 is inserted into the rotating shaft 5, and the assembly 100 of the flywheel 2 and the pulley 3 is fitted on the taper portion 43 of the bush 4. By this second step, the flywheel 2, the pulley 3, and the bush 4 are assembled in a state as shown on the left side of FIG. 2C. In this state, the rotating shaft 5 is inserted into the through hole 46 of the bush 4, and the tapered portion 43 of the bush 4 is in contact with the tapered portion 34 of the pulley 3. A large gap exists between the end surface 47 of the flange portion 45 of the bush 4 and the end surface 3 b of the pulley 3.

  In the third step, as shown in FIG. 2C, the positions of the bush mounting tap hole 33 of the pulley 3 and the pulley mounting drill hole 41 of the bush 4 are aligned, and the bolt 7 is inserted into the pulley mounting drill hole 41. The bush 4 is screwed into the bush mounting tap hole 33, and the bush 4 is fixed to the pulley 3 with the bolt 7. At this time, the bush 4 and the pulley 3 are fastened by the bolt 7 while preventing the disk body 2 from rotating. In the first step, since the flywheel 2 and the pulley 3 are fastened by the bolt 6, the pulley 3 is also prevented from rotating by, for example, gripping and holding the flywheel 2 to prevent the disk body 2 from rotating. Further, it is possible to prevent co-rotation when a tightening torque is applied to the bolt 7 with a tool such as a spanner. By further tightening the bolt 7, the taper portion 43 of the bush 4 enters the back side of the taper portion 34 of the pulley 3, and the bush 4 is relatively displaced to the back side of the inner diameter portion 34 of the pulley 3. Thereby, the bush 4 compressed by the tapered portion 34 of the pulley 3 is slightly deformed so as to narrow the width of the slit 44. Thereby, the pulley 3 is fastened with the rotating shaft 5 via the bush 4, and the pulley 3 and the rotating shaft 5 are finally fixed as shown in FIG. In the state of FIG. 1, the pulley 3 and the bush 4 are firmly fastened by the frictional force acting between the tapered portion 34 of the pulley 3 and the tapered portion 43 of the bush 4. Further, the bush 4 and the rotary shaft 5 are firmly fastened by the frictional force acting between the through hole (inner peripheral surface) 46 of the bush 4 and the outer peripheral surface 51 of the rotary shaft 5. Further, a necessary fastening force is obtained so that a gap finally exists between the end surface 47 of the flange 45 of the bush 4 and the end surface 3b of the pulley 3.

  As described above, the pulley assembly (friction fastening device) 1 according to the present embodiment is assembled by assembling the assembly 100 in which the flywheel (disk body) 2 is fixed to the pulley 3, and after assembly of the assembly 100, the pulley 3, the bush 4 is fitted between the inner diameter portion 34 and the outer peripheral surface 51 of the rotary shaft 5, and the bush 4 and the pulley 3 are fastened with the bolt 7 while preventing the disk body 2 from rotating. 100 is frictionally fastened to the rotary shaft 5 via the bush 4.

  As shown in FIG. 1, the assembled pulley assembly 1 is arranged in the order of the flywheel 2, the pulley 3, and the bush 4 in the axial direction of the rotating shaft 5. In addition, it cannot be overemphasized that the installation range in the axial direction of the rotating shaft 5 overlaps with the taper part 34 of the pulley 3 and the taper part 43 of the bush 4 on the structure of a present Example. Further, the boss portion 31 of the pulley 3 and the outer peripheral portion of the fitting portion 23 of the flywheel 2 have overlapping installation ranges in the axial direction of the rotating shaft 5.

  When removing the pulley 3 from the bush 4, the pulley 7 can be removed from the bush 4 by removing the bolt 7, inserting a bolt into the pulley removal tap hole 42 of the bush 4, and tightening. Needless to say, the flywheel 2 can be used to prevent rotation by fixing the flywheel 2 at this time. Moreover, when removing the pulley 3 from the flywheel 2, the bolt 6 is removed, a bolt is inserted into the pulley removal tap hole 22 of the flywheel 2, and the pulley 3 can be removed from the flywheel 2 by tightening. . In order to align the rotation center of the pulley 3 and the rotation center of the flywheel 2, when the fitting gap between the fitting portion 23 of the flywheel 2 and the boss portion 31 of the pulley 3 is made small, The pulley removal tap hole 22 of the wheel 2 can be used to remove the pulley 3 from the flywheel 2 without using a special tool.

  According to the present embodiment, the flywheel 2 that is a disk body having a diameter larger than the outer diameter of the pulley is used as a fixing device for preventing the rotation of the pulley, thereby preventing the pulley from rotating together when the bolt is fastened. Can do. That is, by using the flywheel 2 as a substitute for preventing co-rotation, the pulley 3 can be attached and detached with only a general-purpose tool.

  In the present embodiment, after the flywheel 2 and the pulley 3 are assembled, the assembly 100 of the flywheel 2 and the pulley 3 is assembled to the rotary shaft 5. For this reason, the bolt 6 can be assembled to the flywheel 2 from the opposite side of the pulley 3. Further, the flywheel mounting tap hole 32 of the pulley 3 to which the bolt 6 is screwed is provided on the center side (inner side) of the belt groove 35 in the radial direction of the pulley 3. For this reason, it is not necessary to provide the flange portion 38 as in the pulley 3 ′ of the fourth embodiment described later. That is, in the present embodiment, the outer periphery of the pulley 3 can be a simple cylindrical shape. In the present embodiment, since it is not necessary to provide the flange portion 38 of the fourth embodiment, the end surface 3a of the pulley 3 that contacts the flywheel 2 can be reduced in diameter to reduce the area thereof, and the fitting portion of the flywheel 2 can be reduced. 23 can also be reduced in diameter to reduce its area. Thereby, the work amount of the finishing process of the fitting part 23 of the flywheel 2 decreases, and the manufacturing time of the flywheel 2 can be shortened. Further, the radius at which the bolt 6 is disposed can be reduced, and the centrifugal force acting on the bolt 6 can also be reduced. For this reason, the influence which the volt | bolt 6, the pulley hole 21 for pulley attachment, the tap hole 32 for flywheel attachment, etc. have on rotation imbalance can be made small.

  The second embodiment according to the present invention is to provide a hole 24 in the flywheel 2 as shown in FIG.

  According to the present embodiment, in the third step of the first embodiment, the flywheel 2 can be easily grasped, and the holding force of the flyhole 2 at the time of fastening with the bolt 7 can be easily increased. By inserting a rod-like object that does not easily deform into the hole 24, for example, a screwdriver or hammer handle, to prevent rotation, a rotation prevention method that does not rely on human power can be achieved.

  The third embodiment according to the present invention is that, in the first or second embodiment, a tapered shape 36 is provided at the end of the boss portion 31 of the pulley 3 as shown in FIG.

  According to this embodiment, it is possible to eliminate a gap between the boss portion 31 of the pulley 3 and the fitting portion 23 of the flywheel 2. That is, the diameter of the boss part 31 can be made equal to or slightly larger than the diameter of the fitting part 23. By making the diameter of the tip portion of the tapered shape 36 smaller than the diameter of the fitting portion 23, the boss portion 31 is fitted into the fitting portion 23 by inserting the taper shape 36 into the fitting portion 23 and applying a load. can do.

  In this embodiment, the flywheel (disk body) 2 has a fitting portion 23 on which the pulley 3 is fitted, and the pulley 3 is tapered (tapered) on the outer diameter end portion on the side fitted on the fitting portion 23. The flywheel 2 and the pulley 3 are fixed by fitting the taper 36 provided at the outer diameter end portion of the pulley 3 into the fitting portion 23.

  Thereby, the rotation center of the pulley 3 and the flywheel 2 can be matched with higher accuracy. Further, since a frictional force acts between the pulley 3 and the flywheel 2, the shearing force acting on the bolt 6 can be reduced, and a structure in which the bolt 6 is not easily broken during power transmission can be achieved.

  Further, when removing the flywheel 2 from the pulley 3, it is possible to remove the flywheel 2 by inserting the bolt into the pulley removal tap hole 22 of the flywheel 2 and tightening it.

  In addition to the above-described embodiment, a method of applying a paint having a large friction coefficient to the surface in order to increase the holding force when gripping the flywheel 2 is also conceivable.

  The fourth embodiment according to the present invention is obtained by changing the fastening structure by the boss portion 31 of the pulley 3 and the fitting portion 23 of the flywheel 2 in the first embodiment.

  As shown in FIGS. 8, 9A, and 9B, in the pulley 3 ′ in the present embodiment, a flange (flange) 38 is provided at an end portion that is fastened to the flywheel 2, and the flywheel is attached to the flange 38. A tapping hole 32 is provided. Further, the flywheel 2 is provided with a concave fitting portion 23 ′ on the disk surface 2 b ′ side. This is similar to the first embodiment in that the bottom surface 29 of the fitting portion 23 'is provided with a pulley mounting drill hole 21, but the flywheel 2' or the fitting portion 23 'provided with the pulley mounting drill hole 21 is provided. The radius from the center of is larger than that of the first embodiment. The diameter of the through hole 27 'is also larger than the diameter of the through hole 27 in the embodiment. In this embodiment, the disk surface 2a ′ of the flywheel 2 ′ is a surface corresponding to the disk surface 2a of the flywheel 2 of the first embodiment, and the disk surface 2b ′ is a surface corresponding to the disk surface 2b of the first embodiment. is there.

  The part of the pulley 3 'in which the belt groove 35 is formed is inserted into the through hole 27' from the disk surface 2b 'side of the flywheel 2' and protrudes to the disk surface 2a 'side. It is made to contact | abut to the bottom face part 29 of the fitting part 23 'of wheel 2'. In this state, the bolt 6 is inserted from the disk surface 2a 'side into the pulley mounting drill hole 21 of the fitting portion 23' and screwed into the flywheel mounting tap hole 32 of the flange portion 38. For this reason, in this embodiment, the fastening portion by the bolt 6 is provided outside the belt groove 35 in the radial direction of the pulley 3 ′.

  In the present embodiment, among the procedures from the first step to the third step relating to the method for attaching the pulley assembly 1 described in the first embodiment, the assembly method (assembly) of the pulley 3 and the flywheel 2 in the first step Only the structure is different, and the other steps and the order from the first step to the third step are not changed.

  Also in this embodiment, after assembling the flywheel 2 ′ and the pulley 3 ′, the bush 4 and the pulley 3 ′ are fastened by the bolt 7 while preventing the disk body 2 ′ from rotating, and the flywheel 2 ′ By assembling the assembly 100 ′ with the pulley 3 ′ on the rotating shaft 5, the pulley 3 ′ can be attached and detached by using only a general-purpose tool by substituting the flywheel 2 ′ to prevent co-rotation. Can be done.

  Each embodiment described above can be applied to a passenger conveyor by adopting the conveyor driving apparatus described in the background art.

  In addition, this invention is not limited to each above-mentioned Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Pulley assembly (fastening device), 2, 2 '... Flywheel, 2a, 2a', 2b, 2b '... Disk surface, 3, 3' ... Pulley, 3a, 3b ... End face, 4 ... Bush, 4a, 4b ... End face, 5 ... Rotating shaft, 6, 7 ... Bolt, 21 ... Pulley mounting hole, 22 ... Pulley removing tap hole, 23, 23 '... Pulley fitting part, 24 ... Hole, 27, 27' ... Through hole, 29 ... bottom face part, 31 ... boss part, 32 ... tapped hole for flywheel attachment, 33 ... tapped hole for bushing attachment, 34 ... tapered part, 35 ... belt groove, 36 ... tapered shape, 38 ... collar part ( Flange), 41 ... Pulse mounting hole, 42 ... Pulse removal tap hole, 43 ... Tapered portion, 44 ... Slit, 45 ... Hut (flange portion), 46 ... Through hole, 47 ... End face, 51 ... Rotating shaft , 100, 100 '... hula Wheel and the pulley of the set product.

Claims (7)

A rotating shaft; a bush having a tapered outer diameter portion fitted to the rotating shaft; a pulley having a tapered inner diameter portion fitted to the bush; and the pulley fixed to the rotating shaft via the pulley In a method of assembling a friction fastening device, which is composed of a disc body having an outer diameter larger than the outer diameter of the pulley, and the bush and the pulley are fastened by a bolt,
Assembling an assembly in which the disc body is fixed to the pulley, and after assembling the assembly, the bushing is fitted between the inner diameter portion of the pulley and the outer peripheral surface of the rotating shaft to rotate the disc body. A method of assembling a friction fastening device, wherein the assembly is frictionally fastened to the rotating shaft via the bush by fastening the bush and the pulley with the bolt while preventing the friction.   2. The bushing according to claim 1, wherein the bush includes a flange portion facing the end surface of the pulley and a drill hole formed in the flange portion, the pulley includes a tap hole in the end surface, and the bolt is inserted into the drill hole. Then, the assembly is frictionally fastened to the rotating shaft via the bush by screwing into the tap hole and displacing the bush relatively to the back side of the inner diameter portion of the pulley. A method for assembling a friction fastening device.   3. The method of assembling a friction fastening device according to claim 2, wherein the pulley is fixed to the disc body with an end surface opposite to the end surface having the tapped hole abutting against the disc body.   4. The flywheel according to claim 3, wherein the disc body is a flywheel that applies an inertial force to a rotating shaft, the flywheel has a drill hole, the pulley has a belt groove around which a belt is wound, and the flywheel A tap hole is provided at a position on the inner side of the belt groove in the radial direction of the end surface in contact with the wheel, and a bolt is inserted into the drill hole of the flywheel to the tap hole of the pulley end surface in contact with the flywheel. An assembly method of a friction fastening device, wherein the flywheel and the pulley are fastened and fixed by screwing.   5. The frictional fastening according to claim 1, wherein the disc body has a hole, and the hole is used as a detent by grasping the hole or inserting an object into the hole. Device assembly method.   6. The disk body according to claim 1, wherein the disc body has a fitting portion into which the pulley is fitted, and the pulley has a taper at an outer diameter end portion on a side to be fitted into the fitting portion. A method of assembling the friction fastening device, wherein the disc body and the pulley are fixed by fitting the taper provided at the outer diameter end portion of the pulley into the fitting portion.   The frictional fastening according to any one of claims 1 to 6, wherein a material having a larger coefficient of friction than the material of the disk body is applied to the disk body, and the disk body is gripped when the disk body is prevented from rotating. Device assembly method.

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