JP6660822B2 - Belt mounting jig and belt mounting method - Google Patents

Description

  The present invention relates to a belt mounting jig used for a multi-stage pulley and a belt mounting method using the belt mounting jig.

  Generally, in a belt transmission mechanism in which a belt is wound around a plurality of pulleys, in order to reliably transmit power between the pulleys, the belt circumference is set shorter than the layout circumference between the pulleys to be mounted. The specifications are such that strong tension is applied. In particular, in a layout without a tension pulley or the like in which the center position of the pulleys can be adjusted, when a belt having a short belt circumferential length is attached between a plurality of pulleys having a fixed inter-axis distance, the belt A strong force against the tension is required, which may be troublesome.

  Further, in the belt transmission mechanism, a so-called multi-stage pulley in which a plurality of pulleys having different diameters are arranged in the axial direction is known. In the belt transmission mechanism using the multi-stage pulley, when the belt is wound around the large-diameter rear pulley located on the back side as viewed from the operator, the belt is once wound around the small-diameter front pulley located on the front side, and There is known a method of shifting a belt wound around a pulley to a rear pulley. Patent Literatures 1 and 2 disclose belt mounting jigs used to shift a belt wound around a front pulley to a rear pulley. Patent Literature 1 and Patent Literature 2 each disclose a belt mounting jig which is attached to an outer peripheral surface of a near pulley and has a guide surface for guiding a belt from the near pulley to a deep pulley.

  The belt mounting jig of Patent Literature 1 includes a jig main body mounted on an outer peripheral surface of a front pulley, and a guide surface formed on the jig main body. Wrap the belt around the pulley near the two-stage pulley, install the belt mounting jig on the outer peripheral surface of the near pulley, and place the belt mounting jig with the two-stage pulley with the belt on the upper surface of the jig body. Rotate. Thereby, the belt is guided by the guide surface from the front pulley to the rear pulley. The belt mounting jig of Patent Literature 1 also includes a protruding piece that protrudes from the jig body to the back side and covers the outer peripheral surface of the back side pulley. However, the guide surface is formed only on the front pulley side of the jig body, and the guide surface is not formed up to the protrusion.

  Further, the belt mounting jig of Patent Literature 2 includes a bottom attached to the outer peripheral surface of the front pulley, and a guide surface formed at an end of the bottom in the pulley circumferential direction. By rotating the belt mounting jig with the two-stage pulley while the belt is hung on the guide surface of the belt mounting jig, the belt is sequentially shifted to the rear pulley across the pulley flange of the rear pulley. I do. This jig is arranged almost entirely on the outer peripheral surface of the front pulley. That is, the guide surface does not extend over the outer peripheral surface of the rear pulley.

Japanese Patent No. 4988619 (FIGS. 1, 4 etc.) Japanese Patent No. 5090961 (FIGS. 1 and 4)

  In the belt mounting jigs described in Patent Literature 1 and Patent Literature 2, the guide surface is formed only on the front pulley side, and on the rear pulley side, a guide that actively guides the belt is installed. Not. For this reason, in some cases, there is a possibility that the belt cannot be reliably shifted to the rear pulley.

  An object of the present invention is to provide a belt mounting jig for easily and reliably shifting a belt wound around a front pulley to a rear pulley in a multi-stage pulley having a front pulley and a rear pulley having a diameter larger than that of the front pulley. And a belt attachment method.

  A belt mounting jig according to a first aspect of the present invention is a multi-stage pulley in which a front pulley and a rear side pulley having a diameter larger than that of the front pulley are arranged side by side in the axial direction of the pulley. A belt mounting jig used to shift a belt which can be extended and contracted in a longitudinal direction to the rear side pulley, wherein the main body is installed on an outer peripheral surface of the front pulley, and a pulley radial outside of the main body. A belt contact portion having a lifting surface located outside the outer peripheral surface of the rear pulley in the pulley radial direction, and the belt contact portion so as to straddle the front pulley and the rear pulley. A guide portion extending to a depth side in the pulley axis direction and having a guide surface inclined inward in the pulley radial direction from the lifting surface toward the depth side in the pulley axis direction. And it is characterized in Rukoto.

  When the main body of the belt mounting jig is installed on the outer peripheral surface of the front pulley, and the belt mounting jig is moved in the pulley rotation direction together with the multiple-stage pulley, the belt wound around the front pulley is While being in contact with the lifting surface, it is lifted to the outside in the pulley radial direction from the large-diameter rear pulley. Further, the lifted belt shifts to the rear pulley side along the inclined guide surface of the guide portion that extends from the front pulley to the rear pulley. Therefore, the belt can be easily and reliably shifted from the front pulley to the rear pulley.

  According to a second aspect of the present invention, in the belt attaching jig of the first aspect, the lifting surface is inclined inward in the radial direction of the pulley toward the inner side in the axial direction of the pulley. Is what you do.

  Since the lifting surface of the belt contact portion is inclined inward in the pulley radial direction toward the back side, the belt lifted by the lifting surface is easily moved to the guide surface by the inclination of the lifting surface. Therefore, the belt can be surely shifted.

  A belt mounting jig according to a third invention is the belt mounting jig according to the second invention, wherein an inclination angle of the lifting surface with respect to the pulley axis direction is smaller than an inclination angle of the guide surface with respect to the pulley axis direction. Things.

  In the belt contact portion, the inclination angle of the lifting surface with respect to the pulley axis direction is relatively small, and in the guide portion that shifts the belt to the rear pulley, the inclination angle of the guide surface with respect to the pulley axis direction is relatively large. That is, since the slope of the lifting surface is gentle, the belt is unlikely to slide down while the belt is lifted by the lifting surface. On the other hand, since the inclination of the guide surface is steeper than that of the lifting surface, the belt lifted by the lifting surface is easily shifted to the inner pulley along the guide surface. Also, when the inclination angle of the lifting surface is small, the amount of protrusion of the belt contact portion outward in the radial direction of the pulley is small, so that the belt mounting jig can be made compact.

  A belt mounting jig according to a fourth aspect of the present invention is the belt mounting jig according to any one of the first to third aspects, wherein a groove extending along a circumferential direction of the pulley is formed on an outer peripheral surface of the inner pulley. An engaging portion that engages with the groove of the back side pulley is formed at an end of the portion on the back side in the pulley axial direction.

  When a groove is formed along the pulley circumferential direction on the rear pulley, the engaging portion formed at the rear end of the guide portion in the pulley axial direction engages with the groove. The guide part becomes difficult to move. Therefore, even if the belt mounting jig is not fixed to the near pulley, it is possible to prevent the mounting jig from coming off due to the repulsive force of the belt.

  A belt mounting method according to a fifth aspect of the present invention includes a first pulley, a second pulley including a plurality of stepped pulleys in which a front pulley and a deeper pulley having a diameter larger than that of the front pulley are arranged in parallel in the pulley axial direction. In the belt transmission mechanism having a belt wound around the first pulley and the second pulley, the belt mounting jig according to any one of the first to third aspects of the present invention uses the belt mounting jig according to any one of the first to third inventions. A belt mounting method for shifting the belt wound around a pulley to the rear side pulley, wherein the main body is wound around the belt of an outer peripheral surface of the front pulley of the second pulley. A jig setting step of setting the belt mounting jig so as to be disposed in a portion where the belt mounting jig is not provided, and moving the belt mounting jig in the circumferential direction of the pulley while rotating the second pulley. Previous A belt contacting step of bringing the belt into contact with the lifting surface of the belt contacting portion, and after the belt contacting step, rotating the second pulley to move the belt by the lifting surface to the rear side in the pulley radial direction. A belt lifting step of lifting to a position outside the pulley, and after the belt lifting step, the second pulley is further rotated to shift the belt to the inner pulley along the guide surface of the guide portion. And a belt shift step.

  By the simple operation of installing the belt mounting jig of any of the first to third inventions and moving the belt mounting jig along with the rotation of the multi-stage pulley, the front pulley is securely moved to the rear pulley. The belt can be shifted.

  In a belt mounting method according to a sixth aspect, in the fifth aspect, the lifting surface is inclined toward the inner side in the pulley radial direction toward the inner side in the pulley axial direction. The inclination angle of the lifting surface with respect to the axial direction is smaller than the inclination angle of the guide surface with respect to the pulley axis direction, and the belt is brought into contact with the lifting surface in the belt contacting step.

  Since the slope of the lifting surface is gentle, the belt does not easily slide down while the belt in contact with the lifting surface is lifted. On the other hand, since the inclination of the guide surface is steeper than the lift surface, the belt lifted by the lift surface is likely to shift to the inner pulley along the guide surface.

  In a belt mounting method according to a seventh aspect, in the fifth or sixth aspect, a plurality of grooves formed on the outer peripheral surface of the rear pulley along the pulley circumferential direction and arranged in the axial direction. An engagement portion that engages with one of the plurality of grooves of the back side pulley is formed at an end of the guide portion on the back side in the pulley axis direction, and the belt mounting jig is provided. When installing on the near pulley, it is preferable that the engaging portion is engaged with a groove on the near side with respect to the farthest side in the pulley axial direction among a plurality of grooves of the far side pulley. It is a feature.

  When a plurality of grooves are formed along the circumferential direction of the pulley on the back side pulley, the engagement portion of the guide portion engages with the groove on the front side of the back side groove, thereby forming a belt mounting jig. Are mounted with at least one groove on the back side in the axial direction of the pulley. As a result, the belt lands on the rear pulley slightly closer to the rear side than the rearmost side of the rear pulley in the pulley axial direction. Therefore, it is possible to prevent the belt from being shifted further away from the rear pulley to the rear side.

It is a front view of a belt transmission mechanism including a two-stage pulley. It is a perspective view of a belt attachment jig concerning this embodiment. It is a six-view figure of a belt attachment jig. (A) is a front view which shows the state which attached the belt attachment jig to the double-stage | hanging pulley, (b) is the same right view. It is explanatory drawing of the usage of a belt attachment jig. 5A is a right side view of FIG. 5C, and FIG. 5B is a right side view of FIG. 5D. It is a right side view of a belt attachment jig concerning a modification. (A) is a right side view of a belt attachment jig according to another modification, and (b) and (c) are right side views showing a state where the belt attachment jig is attached to a two-stage pulley.

  Next, an embodiment of the present invention will be described with reference to FIGS.

(Schematic configuration of belt transmission mechanism)
First, a schematic configuration of a belt transmission mechanism 1 for using a later-described belt attachment jig 10 according to the present embodiment will be described. As shown in FIG. 1, the belt transmission mechanism 1 includes a pulley having a three-axis layout used for an automobile engine, for example, and a V-ribbed belt 5 (belt of the present invention). The three-axis layout pulley includes, for example, a pulley 2 (first pulley of the present invention) which is a crank pulley connected to a crankshaft, and a two-stage pulley 3 for a water pump (a multi-stage pulley of the present invention, Pulley) and a pulley 4 for an air conditioner. Each pulley is rotatably supported, and the distance between the pulley shafts is fixed. The V-ribbed belt 5 is wound around each pulley, and the rotational power of the crankshaft is transmitted from the pulley 2 to the two-stage pulley 3 and the pulley 4 via the V-ribbed belt 5.

  For convenience of the following description, the direction perpendicular to the paper surface of FIG. 1 is defined as the pulley axial direction, and the near side and the far side of the paper surface are defined as the near side and the far side in the pulley axial direction, respectively. The radial direction and the circumferential direction of the two-stage hooked pulley 3 are referred to as a pulley radial direction and a pulley circumferential direction, respectively.

  Next, the configuration of the two-stage pulley 3 will be described. As shown in FIGS. 1 and 4, the two-stage pulley 3 is a pulley in which a front pulley 6 and a rear pulley 7 having a larger diameter than the front pulley 6 are arranged side by side in the pulley axial direction. It is. That is, the front pulley 6 and the rear pulley 7 are configured to be able to rotate in conjunction with each other about the same axis. The positions of the pulleys 2 and 4 and the rear pulley 7 are substantially equal in the axial direction of the pulley. In other words, the near pulley 6 is disposed at a position offset toward the near side from the pulleys 2 and 4 and the rear pulley 7 in the pulley axial direction.

  As shown in FIG. 3B, the outer peripheral surface of the front pulley 6 is flat. A plurality of grooves 71 are formed on the outer peripheral surface of the inner pulley 7 along the pulley circumferential direction. In FIG. 3B, three grooves 71 are formed, and the depth of each groove 71 is substantially equal. Further, pulley flanges 72 and 73 are formed at the front end and the rear end in the pulley axial direction of the rear pulley 7, respectively.

  The V-ribbed belt 5 is an endless belt, and is a so-called low modulus belt that can slightly expand and contract in the circumferential direction. The low modulus belt has a relatively low elastic modulus by using a polyamide fiber for the cord, and a sharp decrease in tension is suppressed as compared with a high modulus belt. On the inner peripheral surface of the V-ribbed belt 5, a plurality of ribs (not shown) are formed along the circumferential direction. The plurality of ribs have a shape that can be fitted with the plurality of grooves 71 of the back side pulley 7.

(Configuration of belt mounting jig)
Next, the configuration of the belt attachment jig 10 according to the present embodiment will be described. In the belt transmission mechanism 1 of FIG. 1, the belt mounting jig 10 is configured to move the belts hooked on the pulleys 2 and 4 and the two-stage hanging pulley 3 from the small-diameter front pulley 6 of the two-stage hanging pulley 3 to the large- It is used when shifting to the side pulley 7.

  2 and 3 are a perspective view and a six-sided view of the belt mounting jig 10, respectively. Note that, for convenience, the directions shown in FIG.

  As shown in FIG. 3, the belt mounting jig 10 is a substantially rectangular jig in a front view and a plan view. As the material, for example, a synthetic resin such as polypropylene is used. The belt attachment jig 10 includes a main body 11, a belt contact portion 12 formed above the main body 11, a guide portion 13 formed to protrude rearward of the belt contact portion 12, and a guide portion 13. And an engagement portion 17 formed at a rear end portion.

  The main body 11 has a bottom surface 14 curved upward along the left-right direction, and a rear surface 18 extending upward from the rear end of the bottom surface 14.

  The belt contact portion 12 has a lifting surface 15. The lifting surface 15 is formed at the upper end of the belt contact portion 12, and is inclined downward toward the rear. The inclination angle A of the lifting surface 15 is, for example, not less than 20 ° and less than an inclination angle B described later.

  The guide portion 13 is a portion protruding rearward from the belt contact portion 12. The lower portion of the guide portion 13 is curved upward along the left-right direction, and is provided with a step in the front-rear direction. The guide section 13 has a guide surface 16. The guide surface 16 is formed at the upper end of the guide portion 13, is adjacent to the rear of the lifting surface 15 of the belt contact portion 12, and is inclined downward toward the rear. The inclination angle B of the guide surface 16 is, for example, not less than 35 ° and not more than 60 °. Note that the inclination angle B is larger than the inclination angle A of the lifting surface 15 of the belt contact portion 12.

  The engaging portion 17 is a portion protruding downward from the rear end of the guide portion 13 along the left-right direction. The engagement portion 17 is curved upward along the left-right direction.

  When the belt mounting jig 10 having the above configuration is mounted on the two-stage pulley 3, the belt mounting jig 10 is in a state as shown in FIGS. That is, the main body 11 is installed on the outer peripheral surface of the near pulley 6, and the bottom surface 14 of the main body 11 contacts the outer peripheral surface of the near pulley 6. The rear surface 18 of the main body portion contacts the front side surface of the rear pulley 7 in the pulley axial direction. The lifting surface 15 of the belt contact portion 12 is located outside the pulley flange 72 of the rear pulley 7 in the pulley radial direction. The guide portion 13 is disposed so as to extend from the front pulley 6 to the rear pulley 7, and a lower portion of the guide portion 13 contacts the pulley flange 72 and the groove 71 of the rear pulley 7. The guide surface 16 of the guide portion 13 is inclined inward in the radial direction of the pulley toward the inner side in the pulley axial direction. Further, the engaging portion 17 engages with one of the plurality of grooves 71 of the rear pulley 7.

(How to use the belt mounting jig)
Next, a belt mounting method using the belt mounting jig 10 having the above configuration will be described. First, as shown in FIG. 5A, the V-ribbed belt 5 is temporarily hooked between the pulley 2 and the pulley 4 and the pulley 6 on the near side of the two-stage hook pulley 3. Since the front pulley 6 has a smaller diameter than the rear pulley 7, the V-ribbed belt 5 can be easily wound around the pulley without applying a large load to the V-ribbed belt 5.

  In addition, the two-stage hanging pulley 3 can be rotated manually. Specifically, for example, by connecting a wrench (not shown) to the pulley 2, the pulley 2 can be freely rotated manually. In FIG. 5, when the pulley 2 is rotated clockwise, its rotational power is sequentially transmitted to the V-ribbed belt 5 and the two-stage pulley 3, and the two-stage pulley 3 rotates right.

  Next, as shown in FIG. 5B, the belt mounting jig 10 is installed on the two-stage hanging pulley 3 (jig installation step of the present invention). Specifically, the main body 11 is installed on a portion of the outer peripheral surface of the front pulley 6 where the V-ribbed belt 5 is not wound. Further, as shown in FIG. 4B described above, the guide portion 13 is straddled on the back side pulley 7, and the engaging portion 17 is set to be larger than the deepest groove 71 of the back side pulley 7 in the pulley axial direction. Is engaged with the groove 71 on the near side. By the above operation, the belt mounting jig 10 can be easily attached to the two-stage pulley 3 without fixing. As shown in FIG. 5B, the belt mounting jig 10 is preferably installed at a position where it does not slide down due to gravity. However, the belt mounting jig 10 may be pressed by hand.

  Next, as shown in FIG. 5C, the two-stage pulley 3 is rotated with the belt mounting jig 10 installed. Then, the belt mounting jig 10 moves in the pulley circumferential direction together with the two-stage hooked pulley 3, and the V-ribbed belt 5 temporarily hooked on the front pulley 6 elongates the lifting surface 15 of the belt contact portion 12 of the belt mounting jig 10. That is, it comes into contact with a surface having a gentle inclination angle A (belt contacting step of the present invention). When the two-stage pulley 3 is further rotated, the V-ribbed belt 5 rides on the lifting surface 15 as shown in FIG. Here, since the inclination angle A is smaller than the inclination angle B, the V-ribbed belt 5 is reliably lifted to the outside in the radial direction of the pulley 7 from the rear pulley 7 without slipping down while riding on the lifting surface 15 (the present invention). Belt lifting process).

  Although the belt mounting jig 10 is not fixed, the rear surface 18 of the main body 11 contacts the front side surface of the rear pulley 7 in the axial direction of the pulley 7, and the engaging portion 17 is engaged with the groove 71 of the rear pulley 7. , The guide portion 13 is difficult to move. Therefore, even while the V-ribbed belt 5 is being lifted, the belt mounting jig 10 can be prevented from coming off due to the repulsive force of the V-ribbed belt 5. However, for example, when it is desired to surely prevent the belt mounting jig 10 from slipping in the circumferential direction of the pulley, the belt mounting jig 10 may be held by a hand or the like.

  Next, as shown in FIG. 5D, the two-stage pulley 3 is further rotated. Then, the V-ribbed belt 5 lifted by the lifting surface 15 of the belt attaching jig 10 is guided along the inclination of the lifting surface 15 by the guide surface 16 of the guide portion 13, that is, the inclination angle B, as shown in FIG. (Belt shift step of the present invention). The V-ribbed belt 5 is guided by the rear pulley 7 while sliding down the guide surface 16. The V-ribbed belt 5 is reliably shifted from the near pulley 6 to the far side pulley 7 because the guide portion 13 is installed across the far side pulley 7.

  Note that, as described above, the engaging portion 17 is engaged with the groove 71 on the near side of the groove 71 located at the innermost side of the rear pulley 7 in the pulley axial direction. For this reason, as shown in FIG. 6B, the shifted V-ribbed belt 5 lands on the back side pulley 7 from a side slightly closer to the back side of the back side pulley 7 in the pulley axis direction. The innermost rib of the plurality of ribs of the V-ribbed belt 5 fits in the innermost groove 71 of the inner pulley 7. Therefore, it is possible to prevent the V-ribbed belt 5 from shifting from the rear pulley 7 to a position shifted to the rear side in the pulley axial direction.

  As shown in FIG. 5E, when the two-stage hooked pulley 3 is further rotated, the rear part of the V-ribbed belt 5 in the pulley rotation direction is sequentially shifted to the back side pulley 7. Finally, as shown in FIG. 5F, the V-ribbed belt 5 is completely shifted to the rear pulley 7. After that, the belt attaching jig 10 is removed from the two-stage pulley 3, and the shift operation of the V-ribbed belt 5 is completed.

  As described above, the belt mounting jig 10 according to the present embodiment has a simple shape and a compact size. Further, the V-ribbed belt 5 is reliably shifted from the front pulley 6 to the rear pulley 7 by a simple operation of setting the belt mounting jig 10 and moving the belt mounting jig 10 with the rotation of the two-stage hanging pulley 3. be able to.

  Next, a modified example in which the embodiment is modified will be described. However, the components having the same configuration as the above embodiment are denoted by the same reference numerals, and the description thereof will be appropriately omitted.

(1) The configuration of the belt mounting jig 10 can be changed as appropriate. For example, the lifting surface 15 of the belt contact portion 12 does not necessarily have to be inclined. As shown in FIG. 7A, a flat lifting surface 15a may be used, or as shown in FIG. 7B, a partially flat lifting surface 15b may be used. In this case, it becomes difficult for the V-ribbed belt 5 to slide down while being lifted. When the belt attachment jigs 10a and 10b are moved in the pulley circumferential direction together with the two-stage pulley 3, the V-ribbed belt 5 may remain on the lifting surfaces 15a and 15b, but the inclined guide surface 16a , 16b straddle the back side pulley 7 side, it is also possible to push the V-ribbed belt 5 to the guide surfaces 16a, 16b side by hand or the like to shift.

  Alternatively, as shown in FIG. 7C, the inclination angle of the lifting surface 15c and the inclination angle of the guide surface 16c may be the same. In this case, the lifted V-ribbed belt 5 is easily shifted from the lifting surface 15c to the guide surface 16c without being caught.

  Further, as shown in FIG. 8, a configuration may be adopted in which the engaging portion 17d can be selected to be engaged with any one of the plurality of grooves 71 of the rear pulley 7. For example, as shown in FIG. 8A, in the belt attachment jig 10d, the width of the bottom surface 14 of the main body 11d in the front-rear direction is made smaller than the width of the near pulley by one groove or more. This makes it possible to change the position of the main body portion 11d in the pulley axis direction with respect to the near pulley.

  Specifically, as shown in FIGS. 8B and 8C, the engagement portion 17 d may be engaged with the second pulley 71 from the rear side in the pulley axial direction with respect to the rear side pulley 7. It is also possible to engage with the groove 71 on the foremost side in the pulley axial direction. Therefore, one belt mounting jig 10d can be commonly used for various types of pulleys and belts. Needless to say, the configuration of the belt attachment jig 10d is not limited to the above-described one, and any configuration may be used as long as the groove 71 for engaging the engagement portion 17d can be selected.

  Further, the material of the belt mounting jig 10 does not necessarily have to be a synthetic resin, and may be, for example, a metal. Further, the belt attaching jig 10 can be installed without being fixed to the front pulley 6, but may be configured to be fixed.

(2) The belt transmission mechanism to which the belt mounting jig of the present invention is applied is not limited to the one shown in FIG. For example, the number and shape of the pulleys can be changed as appropriate. Further, instead of the two-stage pulley 3, a plurality of three-stage or more multi-stage pulleys may be used. Also, the belt is not necessarily a V-ribbed belt, and a V-belt, a flat belt, or the like may be used.

3 Double pulley 5 V-ribbed belt 6 Front pulley 7 Rear pulley 10, 10a, 10b, 10c, 10d Belt mounting jig 11, 11d Main body 12, 12d Belt contact part 13, 13d Guide part 15, 15a, 15b, 15c, 15d Lifting surface 16, 16a, 16b, 16c, 16d Guide surface 17, 17d Engaging portion 71 Groove

Claims (7)

In a multi-stage pulley in which a front pulley and a rear pulley having a diameter larger than that of the front pulley are juxtaposed in the pulley axial direction, a belt stretchable in the circumferential direction wound around the front pulley is moved to the rear side. A belt mounting jig used for shifting to a pulley,
A body portion installed on the outer peripheral surface of the front pulley,
A belt contact portion that is disposed outside the main body portion in the pulley radial direction and has a lifting surface located outside the outer peripheral surface of the rear pulley in the pulley radial direction;
Extending from the belt contact portion to the rear side in the pulley axial direction so as to straddle the front pulley and the rear side pulley, and inward in the pulley radial direction from the lifting surface toward the rear side in the pulley axial direction. And a guide portion having an inclined guide surface.   2. The belt mounting jig according to claim 1, wherein the lifting surface is inclined inward in the radial direction of the pulley as heading toward the inner side in the axial direction of the pulley. 3.   The belt mounting jig according to claim 2, wherein the inclination angle of the lifting surface with respect to the pulley axis direction is smaller than the inclination angle of the guide surface with respect to the pulley axis direction. A groove extending along the circumferential direction of the pulley is formed on an outer peripheral surface of the back side pulley,
The engagement part which engages with the above-mentioned slot of the back side pulley is formed in the end of the back side of the direction of the pulley of the guide part. The belt mounting jig according to the above. A first pulley, a second pulley including a plurality of pulleys in which a front pulley and a deeper pulley having a diameter larger than that of the front pulley are juxtaposed in the pulley axial direction; and the first pulley and the second pulley. In a belt transmission mechanism having a belt wound around the belt, the belt attached to the front pulley of the second pulley using the belt mounting jig according to any one of claims 1 to 3 to move the belt around the back. A belt mounting method for shifting to a side pulley,
A jig installation step of installing the belt attachment jig so that the main body is disposed on a portion of the outer peripheral surface of the front pulley of the second pulley where the belt is not wound;
A belt contacting step of moving the belt attachment jig in a pulley circumferential direction while rotating the second pulley, and bringing the belt into contact with the lifting surface of the belt contact portion of the belt attachment jig;
After the belt contacting step, a belt lifting step of rotating the second pulley to lift the belt by the lifting surface to a position outside the deeper pulley in the pulley radial direction,
A belt shifting step of further rotating the second pulley after the belt lifting step to shift the belt to the inner pulley along the guide surface of the guide portion. Belt mounting method. The lifting surface is inclined toward the inner side in the pulley radial direction toward the inner side in the pulley axial direction,
The inclination angle of the lifting surface with respect to the pulley axis direction is smaller than the inclination angle of the guide surface with respect to the pulley axis direction,
The method according to claim 5, wherein in the belt contacting step, the belt is brought into contact with the lifting surface. The outer peripheral surface of the rear pulley has a plurality of grooves formed along the pulley circumferential direction and arranged in the pulley axial direction,
An engaging portion that engages with any of the plurality of grooves of the rear pulley is formed at an end of the guide portion on the rear side in the pulley axial direction,
When the belt mounting jig is installed on the near pulley, the engaging portion is engaged with a groove on the most forward side in the axial direction of the pulley among the plurality of grooves on the far side pulley. The belt attaching method according to claim 5, wherein the belt is attached.

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