Belt replacement jig and belt replacement method

Abstract

The present invention provides a belt replacement jig and a belt replacement method that allow for the safe removal and installation of belts on pulleys. [Solution] The belt replacement jig 1 comprises a pulley hand-turning jig 3 fixed to the pulley and a belt removal / installation jig for removing and installing the V-belt. The pulley hand-turning jig 3 has a handle plate 5, two claws 7a and 7b, auxiliary plates 9a and 9b for the claws, a set screw nut 15, and a set screw bolt 17. The belt removal / installation jig has a rod-shaped part, a pressing part, and a grip part.

Description

Technical Field

[0001] The present disclosure relates to a belt replacement jig and a belt replacement method.

Background Art

[0002] In air conditioners and the like installed in buildings and the like, for example, as a method of transmitting the driving force of an electric motor or the like to a driven device, there is a method of transmitting it by a belt (V-belt) attached to a pulley. The belt wears out over time and loses its ability to efficiently transmit the driving force. Therefore, it is required to replace the belt regularly.

[0003] When replacing the belt, an operation is performed to remove the belt from the groove of the pulley while touching the belt and turning it. At this time, the hand (fingertips) placed on the belt may be caught between the belt and the groove of the pulley, resulting in the risk of injury. Regarding the method of removing the belt from the pulley, various methods have been proposed, for example, the method proposed in Patent Document 1.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] As described above, in a device that transmits power by a belt attached to a pulley, when replacing the belt regularly, it is required to replace the belt safely.

[0006] This disclosure is made against this backdrop, and one objective is to provide a belt replacement tool that can safely remove a belt attached to a pulley and safely attach a new belt to the pulley, and the other objective is to provide a belt replacement method using the belt replacement tool. [Means for solving the problem]

[0007] The belt replacement jig according to this disclosure is a belt replacement jig for removing and installing a belt on a spoke-type pulley having a hub, rim, and arm, and comprises a pulley hand-turning jig and a belt removal / installation jig. The pulley hand-turning jig rotates the pulley. The belt removal / installation jig removes and installs the belt on the pulley. The pulley hand-turning jig has a long handle member, two locking parts, and a fixing member. The long handle member is attached to the pulley in a manner that is aligned with the diameter direction of the pulley. The two locking parts are attached to the handle member in a manner that is spaced apart and facing each other, and are inserted into the space between the hub and the rim to lock the rim. The fixing member is provided on the handle member and fixes the handle member to the pulley by biasing the handle member away from the pulley while the locking parts are locked to the rim. The belt removal / installation jig has a rod-shaped part and a pressing part. The pressing part is provided on one end of the rod-shaped part.

[0008] The belt replacement method according to this disclosure is a belt replacement method for removing and installing a belt on a pulley using the belt replacement jig described above, and comprises the following steps: A long handle member is positioned on one side of the pulley in the direction of the pulley's rotation axis, along the radial direction of the pulley. Two locking parts are inserted into the space between the hub and the rim from one side to the other side opposite to the first side. On the other side of the pulley in the direction of the rotation axis, the rim is locked by the two inserted locking parts. With the locking parts locked to the rim, the handle member is fixed to the pulley by a fixing member by biasing the handle member away from the pulley in the direction of the rotation axis. While the pulley is rotated by the handle member fixed to the pulley, either the belt is removed from or installed on the pulley using the belt removal jig. [Effects of the Invention]

[0009] According to the belt replacement jig described herein, the belt is replaced using the belt replacement jig while the pulley is rotated using a pulley turning jig attached to the pulley. This allows the belt to be replaced safely and easily.

[0010] According to the belt replacement method described herein, the belt can be replaced safely and easily by using the belt replacement jig described above. [Brief explanation of the drawing]

[0011] [Figure 1] This is a front view showing an example of a mechanism that transmits driving force to which the belt replacement jig according to Embodiment 1 is applied. [Figure 2] This is a side view showing an example of a pulley used in the mechanism for transmitting driving force in the same embodiment. [Figure 3] This is a partial perspective view of the V-belt used in the mechanism for transmitting driving force in the same embodiment. [Figure 4] This is a side view showing an example of a pulley hand-turning jig among the belt replacement jigs in the same embodiment. [Figure 5] In the same embodiment, Figure 4 is a front view of the pulley turning jig shown. [Figure 6] This is a perspective view showing an example of a belt replacement jig in the same embodiment. [Figure 7] This is a side view showing one step in a V-belt replacement method according to Embodiment 2, in which a V-belt is replaced using a belt replacement jig. [Figure 8] This is a side view showing the steps performed after the steps shown in Figure 7 in the same embodiment. [Figure 9] In the same embodiment, this is a front view of the step shown in Figure 8. [Figure 10] This is a perspective view showing one step in the method of removing the V-belt from the pulley, which is performed after the steps shown in Figure 8 in the same embodiment. [Figure 11] This is a perspective view showing the steps performed after the steps shown in Figure 10 in the same embodiment. [Figure 12] This is a perspective view showing one step in the method of attaching the V-belt to the pulley, which is performed after the steps shown in Figure 11 in the same embodiment. [Figure 13] This is a perspective view showing the steps performed after the steps shown in Figure 12 in the same embodiment. [Figure 14] This is a side view showing a pulley hand-turning jig in a belt replacement jig according to a modified example of the same embodiment. [Modes for carrying out the invention]

[0012] Embodiment 1 Embodiment 1 describes an example of a belt replacement jig. The belt replacement jig is used, for example, in air conditioning equipment to replace a belt (V-belt) that transmits driving force.

[0013] Here, an example of a mechanism for transmitting driving force by a V-belt as a belt will be described. As shown in FIG. 1, a first pulley 41a on the driving side connected to a driving device and a second pulley 41b on the driven side connected to a driven device are arranged at an interval. The pulleys 41 (the first pulley 41a and the second pulley 41b) are of a spoke type having a hub 43, a rim 45, and an arm 47. A rotating shaft 51 is attached to the hub 43. A V-belt 61 is stretched between the first pulley 41a and the second pulley 41b with a desired tension.

[0014] As shown in FIG. 2, grooves 49 into which the V-belt 61 fits are formed in the pulleys 41 (the first pulley 41a and the second pulley 41b). This pulley 41 has three grooves 49, namely, a groove 49a, a groove 49b, and a groove 49c. As shown in FIG. 3, the V-belt 61 has a V-shaped (trapezoidal) cross-sectional shape so as to correspond to the cross-sectional shape of the groove 49 of the pulley 41.

[0015] When the first pulley 41a is driven (rotated) by a driving source of a driving device such as an electric motor, the V-belt 61 follows the driving of the first pulley 41a due to the frictional force between the first pulley 41a and the V-belt 61. The second pulley 41b is driven due to the frictional force between the V-belt 61 following the driving of the first pulley 41a and the second pulley 41b. Thus, the driving force of the first pulley 41a is transmitted to the second pulley 41b by the V-belt 61.

[0016] The driving force of the driving device is transmitted to the driven device by the frictional force between each of the first pulley 41a and the second pulley 41b and the V-belt 61. Therefore, the V-belt 61 will wear out over time. The belt replacement jig according to the embodiment is used when removing the worn V-belt 61 from the pulley 41 and attaching a new V-belt 61 to the pulley 41.

[0017] Next, the belt replacement jig will be described in detail. As shown in Figures 4, 5, and 6, the belt replacement jig 1 comprises a pulley turning jig 3 for rotating the pulley 41 and a belt removal jig 31 for removing and installing the belt 61 on the pulley 41.

[0018] As shown in Figures 4 and 5, the pulley turning jig 3 has a handle plate 5 as an elongated handle member, two claws 7 (claws 7a and 7b) as locking parts, and a set screw nut 15 and a set screw bolt 17 as fixing members.

[0019] As will be described later, the elongated handle plate 5 is attached to the pulley 41 in a manner that is aligned with the diameter of the pulley 41 (see Figure 9). A handle body 5a, which serves as a first handle for turning the handle plate 5 attached to the pulley 41, is attached to one end of the handle plate 5.

[0020] The two claws 7 (claws 7a and 7b) are attached to the handle plate 5 via claw support plates 9, with a gap between them and facing each other. Claw 7a is attached to the handle plate 5 via claw support plate 9a. Claw 7b is attached to the handle plate 5 via claw support plate 9b. Claws 7a and 7b are bent in opposite directions to the direction in which they face each other.

[0021] The pawl support plate 9 functions as a spacing adjustment unit that adjusts the distance between pawls 7a and 7b according to the size (diameter) of the pulley 41. As will be described later, pawls 7a and 7b are inserted into the space between the hub 43 and the rim 45 in the pulley 41 to lock the rim 45.

[0022] The set screw nut 15 is attached to the handle plate 5. The set screw bolt 17 is screwed into the set screw nut 15. On the handle plate 5, the set screw nut 15 is positioned so that, with the handle plate 5 attached to the pulley 41, the set screw bolt 17 contacts the hub 43 of the pulley 41. The set screw nut 15 is positioned on the handle plate 5 approximately midway between the position of the pin 11 to which the pawl auxiliary plate 9a is attached and the position of the pin 11 to which the pawl auxiliary plate 9b is attached.

[0023] As shown in Figure 6, the belt removal jig 31 has a long rod-shaped portion 33, a pressing portion 35, and a grip portion 37. The pressing portion 35 is provided on one end of the rod-shaped portion 33. The grip portion 37 is provided on the other end of the rod-shaped portion 33, opposite to the one end. The rod-shaped portion 33 is used when removing the V-belt 61 that is wrapped around the pulley 41 from the pulley 41. The pressing portion 35 is used when attaching the V-belt 61 to the pulley 41. The belt replacement jig 1 according to Embodiment 1 is configured as described above.

[0024] Embodiment 2 Embodiment 2 describes an example of a belt replacement method in which the V-belt 61 is removed from and installed on the pulley 41 using the belt replacement jig 1 described above.

[0025] (Installation of pulley turning jig) First, the procedure for fixing the pulley turning jig 3 to the pulley 41 (first pulley 41a) will be explained. As shown in Figure 7, a long handle plate 5 is positioned along the radial direction of the first pulley 41a on one side in the axial direction of the rotating shaft 51 relative to the first pulley 41a. Next, the two opposing pawls 7a and 7b are inserted into the space between the hub 43 and the rim 45, from one side in the axial direction to the other side opposite to the first side.

[0026] Next, the rim 45 is locked to the first pulley 41a by two pawls 7a and 7b that are inserted on the other axial side of the rotating shaft 51. Then, as shown in Figure 8, with the pawls 7a and 7b locked to the rim 45, the set screw bolt 17 is turned, for example, with a wrench, to bring the end of the set screw bolt 17 on the first pulley 41a side into contact with the hub 43. The set screw bolt 17 is then turned further.

[0027] The set screw bolt 17 is screwed into the set screw nut 15 provided on the handle plate 5. Therefore, with the claw 7 locked onto the rim 45 and the end of the set screw bolt 17 in contact with the hub 43, rotating the set screw bolt 17 biases the handle plate 5 away from the first pulley 41a along the axial direction of the rotation axis 51.

[0028] This fixes the handle plate 5 to the first pulley 41a. Specifically, the handle plate 5 is fixed to the first pulley 41a by the claw 7 that locks the rim 45 and the set screw bolt 17 that contacts the hub 43. As shown in Figure 9, the handle plate 5 is fixed to the first pulley 41a along the diametrical direction of the first pulley 41a. By rotating the handle plate 5 fixed to the first pulley 41a, the first pulley 41a can be rotated as shown by arrow Y1.

[0029] In the pulley turning jig 3 described above, the handle plate 5 is fitted with two claws 7 for engaging the rim 45, a set screw nut 15 that contacts the hub 43, and a set screw bolt 17 that screws into the set screw nut 15. With the two claws 7 engaging the rim 45 and the end of the set screw bolt 17 in contact with the hub 43, turning the set screw bolt 17 biases the handle plate 5 away from the first pulley 41a, allowing the pulley turning jig 3 to be easily fixed to the first pulley 41a.

[0030] (Removing the belt) Next, the procedure for removing the worn V-belt 61 from the first pulley 41a using the pulley turning tool 3 fixed to the first pulley 41a and the belt removal tool 31 will be described.

[0031] As shown in Figure 10, the belt removal tool 31 is positioned so as to be inserted into the space between the V-belt 61 and the first pulley 41a just before it fits into the groove 49a of the first pulley 41a. At this time, the belt removal tool 31 is inserted from the side opposite to the side to which the pulley turning tool 3 is attached to the first pulley 41a, toward the side to which the pulley turning tool 3 is attached. Next, the lower part of the rod-shaped portion 33 of the belt removal tool 31, which has been inserted into the space between the V-belt 61 and the first pulley 41a, is brought into contact with the rim 45 of the first pulley 41a.

[0032] Next, as shown in Figure 11, using the rim 45 in contact with the rod-shaped portion 33 as a pivot point, the grip portion 37 of the belt removal jig 31 is tilted toward the side to which the pulley hand-turning jig 3 is attached relative to the first pulley 41a, as indicated by arrow Y4. This causes the V-belt 61, which is attempting to fit into the groove 49a of the first pulley 41a, to be shifted in the axial direction of the rotating shaft 51 so that it does not fit into the groove 49a of the first pulley 41a. In other words, the belt removal jig 31 shifts the V-belt 61 in the axial direction so that it is disengaged from the groove 49a of the first pulley 41a.

[0033] Next, with the V-belt 61 axially shifted so that it disengages from the groove 49a of the first pulley 41a, grip the handle body 5a of the handle plate 5 and rotate the pulley turning jig 3 as shown by arrow Y1 to rotate the first pulley 41a. As shown by arrow Y2, as the first pulley 41a rotates, the V-belt 61 gradually disengages from the groove 49a of the first pulley 41a in the circumferential direction, and the V-belt 61 is released from its position on the first pulley 41a. In this way, the V-belt 61 is removed from the first pulley 41a.

[0034] In the belt removal jig 31 described above, the elongated rod-shaped portion 33 is used when removing the V-belt 61 from the first pulley 41a. When shifting the V-belt 61 in the axial direction, the rod-shaped portion 33 is tilted using the rim 45, which it is in contact with, as a pivot point. At this time, by using the elongated rod-shaped portion 33, the rod-shaped portion 33 can be easily tilted, and the V-belt 61 can be shifted in the axial direction with relatively little force.

[0035] Furthermore, by rotating the first pulley 41a with the pulley turning jig 3 while the V-belt 61 is shifted axially, the V-belt 61 can be removed from the first pulley 41a without any risk of a hand (or fingers) getting caught between the V-belt 61 and the first pulley 41a, allowing the worn V-belt 61 to be safely and easily removed from the first pulley 41a.

[0036] The above-described procedure for removing the V-belt 61 explained the procedure for removing the V-belt 61 that is fitted into the groove 49a of the first pulley 41a. For example, to remove the V-belt 61 that is fitted into groove 49c, the same procedure as for removing the V-belt 61 that is fitted into groove 49a is used: the V-belt 61 is axially shifted from groove 49c to groove 49b, and then axially shifted from groove 49b to groove 49a. By fitting the V-belt 61 into groove 49a, the V-belt 61 can be removed from the first pulley 41a using the above-described removal procedure.

[0037] (Attaching the belt) Next, we will explain the procedure for attaching the new V-belt 61 to the pulley 41 (first pulley 41a) using the pulley turning jig 3 and the belt removal jig 31.

[0038] As shown in Figure 12, first, the V-belt 61 is placed on the stationary first pulley 41a so that a portion of the V-belt 61 fits into the groove 49a of the first pulley 41a. Next, as shown in Figure 13, the pressing portion 35 of the belt removal jig 31 is used to press down on the portion of the V-belt 61 that is fitted into the groove 49a of the first pulley 41a from above in the radial direction of the first pulley 41a.

[0039] Next, grip the handle body 5a of the handle plate 5 and rotate the pulley turning jig 3 in the direction indicated by arrow Y1, thereby rotating the first pulley 41a in the direction indicated by arrow Y2. At this time, while holding the V-belt 61 with the retaining part 35, move the belt removal jig 31 in the direction indicated by arrow Y5 in accordance with the rotation of the first pulley 41a. As the first pulley 41a rotates, the V-belt 61 gradually fits into the groove 49a of the first pulley 41a in the circumferential direction. In this way, the new V-belt 61 is attached to the first pulley 41a.

[0040] In the belt removal jig 31 described above, when attaching a new V-belt 61 to the first pulley 41a, the pressing portion 35 provided at one end of the rod-shaped portion 33 is used. With the first pulley 41a stationary, a portion of the V-belt 61 is fitted into the groove 49a of the first pulley 41a, and then the first pulley 41a is rotated while pressing the portion of the V-belt 61 with the pressing portion 35, thereby attaching the V-belt 61 to the first pulley 41a. This prevents the hand (or fingers) from getting caught between the V-belt 61 and the first pulley 41a, and allows the V-belt 61 to be attached to the first pulley 41a safely and easily.

[0041] The above-described procedure for installing the V-belt 61 explained the procedure for fitting the V-belt 61 into the groove 49a of the first pulley 41a. For example, to fit the V-belt 61 into groove 49c, the V-belt 61, which is fitted into groove 49a, should be shifted axially from groove 49a to groove 49b, and then shifted axially again from groove 49b to groove 49c.

[0042] (modified version) Pulleys 41 come in various sizes depending on the specifications of the drive unit and the driven unit. In the belt replacement jig 1 described above, one example is a structure in which the distance between the claws 7a and 7b that engage the rim 45 of the pulley 41 is adjusted by the claw auxiliary plate 9.

[0043] In addition to this structure, as shown in Figure 14, an elongated hole 19 may be provided in the handle plate 5 as a spacing adjustment part for adjusting the distance between the claws 7a and 7b. In this case, each of the claws 7a and 7b is allowed to move along the longitudinal direction of the elongated hole 19. After adjusting the distance between the claws 7a and 7b to correspond to the size of the pulley 41, the claws 7a and 7b are fixed to the handle plate 5 by fixing screws 21.

[0044] Alternatively, a handle 13 may be attached to the set screw bolt 15 as a second handle to turn the set screw bolt 17. By turning the handle 13, the set screw bolt 15 can be easily turned, and the pulley turning jig 3 can be fixed to the pulley 41 (see Figure 9) without using tools such as a wrench.

[0045] Note that the other components are the same as those in the pulley hand-turning jig 3 shown in Figures 4 and 5, so the same reference numerals are used for the same components and their descriptions are not repeated.

[0046] With the pulley turning jig 3 described above, by using it in conjunction with the belt removal jig 31 (see Figure 6), the worn V-belt 61 can be safely and easily removed from the pulley 41, similar to the belt replacement jig 1 described above. In addition, a new V-belt 61 can be safely and easily installed on the pulley 41.

[0047] In the above-described embodiment, the case of replacing a V-belt used in an air conditioning system was given as an example. The belt replacement jig 1 described above is not limited to air conditioning systems, but can be broadly applied to any device that has a mechanism for transmitting the driving force of a drive unit to a driven unit using a pulley and a V-belt.

[0048] The belt replacement jigs described in the embodiments can be combined in various ways as needed.

[0049] The embodiments disclosed herein are illustrative and not limiting. The present invention is defined by the claims, not the scope described above, and all modifications in the meaning and scope equivalent to the claims are intended.

[0050] Furthermore, this disclosure includes the following aspects: [Note 1] A belt replacement jig for removing and installing a belt on a spoke-type pulley having a hub, rim, and arm, A pulley turning jig for rotating the aforementioned pulley, A belt removal and installation jig for removing and installing the belt on the pulley. Equipped with, The aforementioned pulley hand-turning jig is, A long handle member attached to the pulley in a manner that is aligned with the diameter of the pulley, Two locking parts are attached to the handle member in a manner that is spaced apart and facing each other, and are inserted into the space between the hub and the rim to lock the rim, A fixing member is provided on the handle member, and while the locking portion is locked to the rim, the fixing member biases the handle member away from the pulley, thereby fixing the handle member to the pulley. It has, The aforementioned belt attachment / detachment jig is A long, rod-shaped section, A pressing portion provided on one end of the rod-shaped portion and A belt replacement jig having the following features.

[0051] [Note 2] The elongated handle member is The long handle body, A first handle attached to one end of the aforementioned handle body and The belt replacement jig described in Appendix 1, including the one described in Appendix 1.

[0052] [Note 3] The belt replacement jig according to Appendix 1 or 2, wherein each of the two locking portions includes a claw portion extending from the handle member.

[0053] [Note 4] The belt replacement jig according to any one of the appendices 1 to 3, wherein the two locking parts include a spacing adjustment part for adjusting the distance between the two opposing locking parts.

[0054] [Note 5] The aforementioned fixing member is A set screw nut attached to the handle member, A set screw bolt that is screwed into the set screw nut and comes into contact with the hub of the pulley, A belt replacement jig, including any one of the items in Appendix 1 to 4.

[0055] [Note 6] The fixing member is the belt replacement jig described in Appendix 5, which includes a second handle for rotating the set screw bolt.

[0056] [Note 7] The aforementioned rod-shaped portion is A rod-shaped main body portion interposed between the belt and the pulley, A pressing portion is provided on the rod-shaped main body and presses the belt toward the pulley. A belt replacement jig, including any one of the items in Appendix 1 to 6.

[0057] [Note 8] A belt replacement method for removing and installing a belt on a pulley using a belt replacement jig described in any one of the appendices 1 to 7, The steps include: positioning the elongated handle member along the radial direction of the pulley on one side of the pulley in the direction of its rotation axis; The steps include inserting the two locking portions into the space between the hub and the rim from one side to the other side opposite to the one side, The step of locking the rim with two locking portions inserted through the pulley on the other side in the direction of the rotation axis, With the locking portion locked to the rim, the handle member is biased by the fixing member in a direction away from the pulley along the rotation axis, thereby fixing the handle member to the pulley. The steps include: rotating the pulley with the handle member fixed to the pulley, and using the belt removal / installation jig to either remove or install the belt on the pulley; A belt replacement method that includes the following features.

[0058] [Note 9] The step of removing the aforementioned belt is: The step of interposing the rod-shaped portion between the pulley and the belt attached to the pulley, The belt is removed from the pulley by rotating the pulley while biasing the belt in a direction intersecting the direction in which the belt extends, using the rod-shaped portion interposed between the pulley and the belt. The belt replacement method described in Appendix 8, including the method described in Appendix 8.

[0059] [Note 10] The step of attaching the aforementioned belt is: The steps include placing the belt on the pulley, The belt is attached to the pulley by rotating the pulley while pressing the belt, which is placed on the pulley, toward the pulley with the pressing part. The belt replacement method described in Appendix 8, including the method described in Appendix 8. [Industrial applicability]

[0060] The belt replacement jig described herein is effectively used when removing and installing a V-belt on a spoke-type pulley. [Explanation of Symbols]

[0061] 1 Belt replacement jig, 3 Pulley hand-turning jig, 5 Handle plate, 5a Handle body, 7, 7a, 7b Claws, 9, 9a, 9b Auxiliary plates for claws, 11 Pin, 13 Handle, 15 Set screw nut, 17 Set screw bolt, 19 Slotted hole, 21 Fixing screw, 31 Belt removal jig, 33 Rod-shaped part, 35 Pressing part, 37 Grip part, 41 Pulley, 41a First pulley, 41b Second pulley, 43 Hub, 45 Rim, 47 Arm, 49, 49a, 49b, 49c Groove, 51 Rotating shaft, 61 V-belt, Y1, Y2, Y3, Y4, Y5 Arrows.

Claims

1. A belt replacement jig for removing and installing a belt on a spoke-type pulley having a hub, rim, and arm, A pulley turning jig for rotating the aforementioned pulley, A belt removal and installation jig for removing and installing the belt on the pulley. Equipped with, The aforementioned pulley hand-turning jig is, A long handle member attached to the pulley in a manner that is aligned with the diameter of the pulley, Two locking parts are attached to the handle member in a manner that is spaced apart and facing each other, and are inserted into the space between the hub and the rim to lock the rim, A fixing member is provided on the handle member, and while the locking portion is locked to the rim, the fixing member biases the handle member away from the pulley, thereby fixing the handle member to the pulley. It has, The aforementioned belt attachment / detachment jig is Rod-shaped part, A pressing portion provided on one end of the rod-shaped portion and A belt replacement jig having the following features.

2. The elongated handle member is The long handle body, A first handle attached to one end of the aforementioned handle body and The belt replacement jig according to claim 1, including the following:

3. The belt replacement jig according to claim 1, wherein each of the two locking portions includes a claw portion extending from the handle member.

4. The belt replacement jig according to claim 1, wherein the two locking portions include a spacing adjustment portion for adjusting the distance between the two opposing locking portions.

5. The aforementioned fixing member is A set screw nut attached to the handle member, A set screw bolt that is screwed into the set screw nut and comes into contact with the hub of the pulley, The belt replacement jig according to claim 1, including the following:

6. The belt replacement jig according to claim 5, wherein the fixing member includes a second handle for rotating the set screw bolt.

7. The aforementioned rod-shaped portion is A rod-shaped main body portion interposed between the belt and the pulley, A pressing portion is provided on the rod-shaped main body and presses the belt toward the pulley. The belt replacement jig according to claim 1, including the following:

8. A belt replacement method for removing and installing a belt on a pulley using a belt replacement jig according to any one of claims 1 to 7, The steps include: positioning the elongated handle member along the radial direction of the pulley on one side of the pulley in the direction of its rotation axis; The steps include inserting the two locking portions into the space between the hub and the rim, from one side to the other side opposite to the one side, The step of locking the rim with two locking portions inserted through the pulley on the other side in the direction of the rotation axis, With the locking portion locked to the rim, the handle member is biased by the fixing member in a direction away from the pulley along the rotation axis, thereby fixing the handle member to the pulley. The steps include: rotating the pulley with the handle member fixed to the pulley, and using the belt removal / installation jig to either remove or install the belt on the pulley; A belt replacement method that includes the following features.

9. The step of removing the aforementioned belt is: The step of interposing the rod-shaped portion between the pulley and the belt attached to the pulley, The belt is removed from the pulley by rotating the pulley while biasing the belt in a direction intersecting the direction in which the belt extends, using the rod-shaped portion interposed between the pulley and the belt. The belt replacement method according to claim 8, including the method described in claim 8.

10. The step of attaching the aforementioned belt is: The steps include placing the belt on the pulley, The belt is attached to the pulley by rotating the pulley while pressing the belt, which is placed on the pulley, toward the pulley with the pressing part. The belt replacement method according to claim 8, including the method described in claim 8.

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