JP7384857B2 - Belt installation jig and belt installation method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a belt mounting jig having an auxiliary tool for fixing to a pulley when a circumferentially expandable belt to be wound between a plurality of pulleys is wound around the pulleys, and a belt mounting method.

In a belt transmission mechanism that is used by wrapping a belt between multiple pulleys, for example, there is no tension pulley that can adjust the axial center position of the pulleys, and the distance between the axes of the multiple pulleys is all fixed. There is a layout. Generally, in order to reliably transmit power between the pulleys, such a belt transmission mechanism has a belt circumference shorter than the layout circumference between the pulleys to which it is attached, so that strong tension is applied to the belt. The specifications are as follows.

As a method for attaching a belt having a circumferential length shorter than the layout circumferential length between the plurality of pulleys as described above, for example, the following method is used. First, leave one pulley last and wrap the belt around the other pulleys first. Then, use a belt installation jig to apply tension to the belt wrapped around the other pulleys, and then wrap the belt around the other pulleys. While rotating the remaining pulley, attach the belt to the outer circumferential surface of the last remaining pulley.

Regarding the belt mounting jig mentioned above, we propose a belt mounting jig that is effective mainly for a two-axis layout where the belt is wrapped between two pulleys, or a three-axis layout where the belt is wrapped between three pulleys. has been done.

Here, the two-axis layout (see FIG. 21) and the three-axis layout (see FIG. 22) have the following differences in terms of workability in the belt attachment work using a belt attachment jig.

[Difference 1]
As shown in FIGS. 21 and 22, in the 2-axis layout and the 3-axis layout, due to the difference in the winding angle between the belt and the second pulley, in the 3-axis layout, compared to the 2-axis layout, the second pulley Because the force pushing the belt inward in the radial direction of the pulley is small, for example, if the belt is twisted between the first and second pulleys, the belt will be removed from the second pulley (point X2 in Figure 22). It will come off easily.

[Difference 2]
As shown in FIGS. 21 and 22, in the two-axis layout and the three-axis layout, when the belt attachment jig is attached to the first pulley, the first pulley and the belt contact each other at the rear of the belt attachment jig. Due to the difference in the area (see point Y1 in Figure 21 and point Y2 in Figure 22) (difference in the degree of freedom in the attachment position of the belt attachment jig to the first pulley), the 3-axis layout When the belt starts to be wrapped around the first pulley, there are cases where a sufficient contact area between the first pulley and the belt cannot be secured (the contact area may be zero). In this case, when the belt starts to be wrapped around the first pulley, almost no tension is applied to the belt, so the part immediately behind the belt mounting jig (opposite to the rotational direction of the first pulley) The belt tends to lift up from the first pulley, and the belt easily climbs over the flange of the first pulley and comes off.

Therefore, for example, in order to prevent the belt from coming off from the second pulley as described in [Difference 1] above, it is necessary to provide a jig to prevent the belt from coming off from the second pulley on the side surface of the second pulley, or to prevent the belt from coming off from the second pulley. It is conceivable to use a so-called "second jig" such as providing a guide rail to prevent the belt from coming off between the belt span and the second pulley. As a method that does not use a "second jig", as described in Patent Document 1, in the belt between the first pulley and the second pulley during belt installation work, the inner peripheral surface of the belt By holding the belt in such a position that it faces the side of the first pulley, the belt wound around the second pulley is subjected to a particularly strong force pressing the front side of the second pulley onto the outer peripheral surface of the second pulley. This has the effect that the belt is less likely to come off the flange of the second pulley.

However, when the belt mounting jig of Patent Document 1 is used in a three-axis layout, as described in [Difference 2], the part immediately at the rear of the belt mounting jig tends to lift up from the first pulley. The belt easily climbs over the flange of the first pulley and comes off.

On the other hand, as a means to prevent the part of the belt immediately behind the belt mounting jig from lifting up from the first pulley, the back surface of the belt is placed on the outer peripheral surface of the first pulley at the part immediately behind the belt mounting jig. Patent Document 2 discloses a belt mounting jig that includes a "belt pressing section" that presses the belt toward the belt.

However, in the belt mounting jig of Patent Document 2, a force that forcibly bends the belt in the belt width direction is applied, so that excessive tension is applied to the belt, which may cause permanent distortion in the belt. Furthermore, as stated in paragraph [0042], "When the crank pulley 2 is rotated, the pulley pressing part 7 disappears from the relationship in which it is held between the V-ribbed belt 4 and the outer periphery of the crank pulley 2, and when the crank pulley 2 is further rotated, As shown in FIG. 14, the belt mounting jig 6 is suspended from the V-ribbed belt 4 and is ejected from the crank pulley 2 toward the alternator pulley 3. There is also a risk that the belt mounting jig may fall or jump out from between the spans of the pulleys, which poses problems in workability.

Therefore, Patent Document 3 discloses a belt mounting jig that prevents the belt from lifting up at the rear of the belt mounting jig and also prevents the belt from being forcedly bent in the belt width direction.

WO2011/158505 publication Japanese Patent Application Publication No. 2010-249312 Japanese Patent Application Publication No. 2014-031881

However, the belt mounting jig of Patent Document 3 has problems in the following four aspects.

(Problem 1)
The parts that contact the inner peripheral surface of the wrapped belt (holding surface 8, introduction surface 9) are not curved along which the wrapped and bent belt can follow, but are corner parts (boundary between holding surface 8 and introduction surface 9). It has a certain shape. Then, when the belt passes through the holding surface 8 and the introduction surface 9, the belt is bent at this corner. Further, the belt passing through the holding surface 8 and the introduction surface 9 also serves to hold down the belt mounting jig so that the pulleys and the belt mounting jig do not become disengaged from each other. However, if the inner circumferential surface of the belt cannot be in full contact with the holding surface 8 and the introduction surface 9, the effect of the belt holding down the belt mounting jig will be reduced, and there is a risk that the belt mounting jig may become uncoupled. be. Therefore, in order to firmly press the belt mounting jig so that it does not come off, it is necessary to apply excessive tension to the belt and force it to bend.

(Problem 2)
The holding portion 19 is set to have a longer protruding length than the protruding piece 18a so that the holding portion 19 reliably holds down the belt 4 fitted in the pulley groove 5 (see paragraph [0056]). If the length of the presser foot is long, the belt can be held securely, but even when the belt winding operation is completed, the belt interferes with the presser foot too much, making it difficult to properly attach the belt to the belt. It becomes difficult to separate from the ingredients. Alternatively, when an operator removes the belt attachment jig from the pulley, problems arise in workability, such as the holding part getting in the way and making it difficult to remove.

(Problem 3)
When this belt mounting jig is used in a 3-axis layout, as mentioned above, the distance (separation distance) at which the immediately rear part of the belt mounting jig rises toward the outside of the pulley outer circumferential surface increases. . At this time, when a strong lifting force acts on the belt, the holding part of the belt attachment jig is pushed up, and as a result, the rear of the belt attachment jig body is lifted up. In this case, the function of pressing the belt against the pulley by the holding part of the belt mounting jig is not achieved, and there is a risk that the belt may ride on the flange of the pulley or the belt mounting jig may come off and fall off the pulley.

(Problem 4)
When a cylindrical recess is formed on the side of the pulley to which the belt mounting jig is attached, a step (see step D in FIG. 11 of the present application) is formed between the pulley flange side and the recess on the pulley side. . When a belt is wound around a pulley having such a recessed portion, when the belt passes through the side surface of the pulley flange, the edge of the belt may get caught on the step, causing the belt to turn over. If the pulley is turned forcibly as it is, there is a risk that the edge of the belt will be damaged.

Therefore, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to smoothly perform belt installation work without placing an excessive load on the belt, even in belt installation work in a 3-axis layout. To provide a belt mounting jig and a belt mounting method that allow the belt to be mounted.

One of the inventions for solving the above problems is a belt mounting jig used when winding a circumferentially expandable belt between a plurality of pulleys,
The main body and
The belt mounting jig is provided on the main body, and is placed on the outer periphery of the pulley with the belt mounting jig attached to the pulley to be mounted, and when the belt is hung, the tension of the belt causes the pulley to a wrapping portion that is pressed toward the outer circumference;
a guide portion that guides a side surface of the belt wrapped around the wrapping portion;
a presser portion that is arranged to face the outer periphery of the pulley when the belt mounting jig is attached to the pulley and presses the belt wound around the pulley toward the outer periphery of the pulley; ,
a cover portion that covers a side surface of the pulley;
The winding part and the cover part guide the belt, which is placed along the outer periphery of the pulley, to the outside in the radial direction of the pulley, and guide the belt, which is guided to the outside in the radial direction of the pulley, to the axis of the pulley. While bending the belt outwardly, the belt is also bent inwardly in the radial direction of the pulley, and is guided along the side surface of the pulley, and the belt is bent uniformly from the inner circumferential surface of the belt that bends in the process of being guided. It has a three-dimensional curved surface that contacts so as to apply pressure,
The cover portion extends along a side surface of the pulley toward the front in the rotational direction of the pulley for a longer length than the widthwise length of the belt,
The holding portion is characterized in that a length that protrudes from the axially outer side of the pulley toward the axially inner side is smaller than a length of the wrapping portion that protrudes from the axially outer side of the pulley toward the axially inner side. .

Since the winding part and the cover part of the belt mounting jig have three-dimensional curved surfaces, the belt that is placed along the outer circumference of the pulley to be mounted is guided to the outside in the radial direction of the pulley. The belt guided outward in the direction bends outward in the axial direction of the pulley, and also bends inward in the radial direction of the pulley, and as it follows the side of the pulley, the belt mounting jig The pressure applied to the winding part and the cover part can be made uniform. Thereby, the belt attachment jig can be pressed against the pulley easily without applying excessive tension to the belt, and the fit between the belt attachment jig and the pulley can be ensured.
In addition, when the holding part presses the belt toward the outer circumference of the pulley, when the belt starts to wrap around the pulley, the part immediately behind the belt mounting jig (opposite to the pulley rotation direction) is removed from the pulley. This prevents the belt from climbing over the pulley edge (flange portion) and coming off.
In addition, by making the protruding length of the presser part smaller than the protruding length of the winding part, the belt mounting jig can be easily separated from the belt when the belt has finished winding around the pulley. can. Alternatively, when the operator removes the belt attachment jig from the pulley, it becomes easier to remove it.
In addition, since the cover part extends along the side of the pulley toward the front in the rotational direction of the pulley for a longer length than the length in the width direction of the belt, when the belt passes through the wrapping part, the inside of the belt A cover part extending longer than the length of the belt in the width direction can be inserted between the circumferential surface and the side surface of the pulley. By doing so, the inner circumferential surface of the belt and the side surface of the pulley are separated by the thickness of the extended cover part and do not come into direct contact with each other. When the belt stretched between the pulley and the pulley (the pulley to be installed) moves from the inside in the radial direction of the pulley to the outside, the belt is stretched between the recess of the pulley and the side of the pulley. It can be maintained until it passes through the steps. As a result, the belt can smoothly pass through the steps, and twisting and damage caused by the belt getting caught on the steps can be prevented.

Further, the present invention provides the belt mounting jig further comprising an auxiliary tool for fixing to the pulley to be mounted,
The auxiliary device is
It has an end shape with a ring-shaped part that can be expanded and contracted in the radial direction,
The outer diameter of the annular portion is larger than the inner diameter of a bottomed cylindrical recess provided on a side surface of the pulley when no external force is applied;
The annular portion is capable of pressing the inner wall of the recess while in contact with the bottom of the recess in a radially contracted state;
The main body portion may be attachable to one end.

According to the above configuration, when the belt is wound between multiple pulleys, if a strong lifting force is applied to the belt that causes it to go over the edges (flanges) of the pulleys, the holding part of the belt mounting jig will also be affected. may be pushed up. Therefore, the contracted ring-shaped part of the auxiliary tool is brought into contact with the inner wall of a cylindrical recess with a bottom provided on the side of the pulley, and then the contraction of the ring-shaped part is released, so that the recess is closed. By pressing the ring-shaped part of the auxiliary tool against the inner wall, the auxiliary tool, which has a belt attachment jig attached to one end thereof, is firmly fixed to the pulley. Thereby, even if a strong lifting force acts on the belt, the belt mounting jig can be prevented from being pushed up (it can be prevented from coming off).

The present invention also provides a belt attachment method in which a belt that can be expanded and contracted in the circumferential direction is wound between a plurality of pulleys using a belt attachment jig that does not have the above-mentioned auxiliary tool.
a step of winding the belt around a pulley other than the pulley to be attached;
The cover part is guided by the guide part from the surface of the winding part, with the pressing part facing the outer periphery of the belt and the winding part facing the inner periphery of the belt. The belt is temporarily attached to the pulley along the surface of the pulley with the inner circumferential surface of the belt facing the side surface of the pulley.

According to the above method, the belt attachment jig can be easily pressed against the pulley without applying excessive tension to the belt, and the belt attachment jig can be reliably fixed to the pulley. Further, it is possible to prevent the belt from climbing over the edge (flange portion) of the pulley and coming off. Furthermore, the belt mounting jig can be easily separated from the belt in a state where the winding operation of the belt around the pulley is completed.

Further, the present invention provides a belt attachment method in which a belt that is stretchable in the circumferential direction is wound between a plurality of pulleys using a belt attachment jig having the above-mentioned auxiliary tool,
After the annular portion is contracted and brought into contact with the bottom of a bottomed cylindrical recess provided on the side surface of the pulley to be attached, the annular portion is released from the contraction. pressing the ring-shaped portion against the inner wall of the recess and fixing the wrapping portion along the outer periphery of the pulley;
a step of winding the belt around a pulley other than the pulley to be attached;
With the inner circumferential surface of the belt facing the side surface of the pulley, the belt is guided from the side surface of the pulley to the cover section, and further, the belt is guided along the winding section while being guided by the guide section. temporarily hanging the belt by passing it between the pressing part and the outer periphery of the pulley;
The method is characterized in that it includes a step of rotating the pulley.

According to the above method, by using a belt mounting jig with an auxiliary tool in a series of operations for winding a belt around multiple pulleys, the belt mounting jig can be reliably fixed to the target pulley. . Furthermore, while the belt is firmly pressed against the pulley during the belt installation work, the belt can be worked in a comfortably bent form without excessive tension being applied to the belt. As a result, the reliability and safety of the belt attachment work can be greatly improved.

It is possible to provide a belt mounting jig and a belt mounting method that can smoothly perform belt mounting work without applying an excessive load to the belt even in belt mounting work in a three-axis layout.

It is a six-sided view of the belt attachment jig concerning this embodiment. It is an explanatory view of a belt attachment jig concerning this embodiment. It is an explanatory view of how to use the belt attachment jig to which the auxiliary tool according to the first embodiment is attached. It is an explanatory view of how to use the belt attachment jig to which the auxiliary tool according to the first embodiment is attached. It is an explanatory view of how to use the belt attachment jig to which the auxiliary tool according to the first embodiment is attached. It is an explanatory view of how to use the belt attachment jig to which the auxiliary tool according to the first embodiment is attached. It is an explanatory view of how to use the belt attachment jig to which the auxiliary tool according to the first embodiment is attached. It is an explanatory view of how to use the belt attachment jig to which the auxiliary tool according to the first embodiment is attached. It is a perspective view of the belt attachment jig which attached the auxiliary tool based on 2nd Embodiment. This is a layout of the first pulley, second pulley, and third pulley. It is an explanatory view of a first pulley. FIG. 3 is an explanatory diagram of three-dimensional curved surfaces of a winding portion and a cover portion of the belt attachment jig. It is an explanatory view of a presser part concerning a belt attachment jig. It is an explanatory view of how to use the belt attachment jig to which the auxiliary tool according to the second embodiment is attached. It is an explanatory view of how to use the belt attachment jig to which the auxiliary tool according to the second embodiment is attached. It is an explanatory view of how to use the belt attachment jig to which the auxiliary tool according to the second embodiment is attached. It is an explanatory view of how to use the belt attachment jig to which the auxiliary tool according to the second embodiment is attached. It is an explanatory view of how to use the belt attachment jig to which the auxiliary tool according to the second embodiment is attached. It is an explanatory view of how to use the belt attachment jig to which the auxiliary tool according to the second embodiment is attached. FIG. 7 is an explanatory diagram of a pulley in which two recesses are formed in a step-like manner in the pulley axial direction according to another embodiment. FIG. 2 is an explanatory diagram of a two-axis layout. FIG. 3 is an explanatory diagram of a three-axis layout.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. The belt mounting jig 6 (no auxiliary tool is used) according to the first embodiment is a first pulley 1 (corresponding to the pulley to be mounted) with all the distances between their axes fixed, as shown in FIG. ), the second pulley 2, and the third pulley 3 (three-axis layout), it is used when wrapping the V-ribbed belt 4, which can be expanded and contracted in the circumferential direction.

In the engine layout of an automobile, as shown in FIG. 3, a first pulley 1 (crank pulley) connected to the crankshaft of the engine, etc., a second pulley 2 (water pump pulley) that drives a water pump, A third pulley 3 (air conditioner pulley) connected to the shaft of a compressor of an air conditioner or the like is rotatably supported with the distance between their axes all fixed. A V-ribbed belt 4 is wound between the first pulley 1, the second pulley 2, and the third pulley 3, and the power from the crankshaft of the engine, etc. is passed through the first pulley 1 and the second pulley 2. The power is transmitted to the water pump shaft, driving the water pump. Further, power from a crankshaft of an engine or the like is transmitted to the shaft of the compressor via the first pulley 1, second pulley 2, and third pulley 3, thereby driving the compressor. In addition, in this embodiment, the distance between the axes of each of the first pulley 1, the second pulley 2, and the third pulley 3 is fixed (unchangeable). Further, a tension applying means (tension pulley or auto tensioner) for applying tension to the V-ribbed belt 4 is not mounted.

(Structures of the first pulley 1, second pulley 2, and third pulley 3)
As shown in FIG. 11, the first pulley 1 has four pulley grooves (first pulley The first pulley 1 has a fitting groove (not shown) provided on the outer periphery of the first pulley 1, and a pair of flanges 13 that sandwich this pulley groove in the axial direction of the first pulley 1.

Further, the shaft 1c of the first pulley 1 is formed with a boss portion 11 into which a crankshaft of an engine or the like is inserted (a crank can be attached to this boss portion 11). Furthermore, a cylindrical recess 12 with a bottom is provided on the side surface of the first pulley 1 . This recess 12 has a bottom surface 12a (circular shape) perpendicular to the axis 1c of the first pulley 1, a cylindrical inner wall 12b whose center axis is the axis 1c of the first pulley 1, and a bottom surface 12a of the first pulley 1. It has six semicircular (rounded) through holes 12c that are formed (reduced) so as to surround the axis 1c of. Note that the inner diameter φ of the recess 12 is the diameter of the cylindrical inner wall 12b. As described above, by providing the recess 12 on the side surface of the first pulley 1, the first pulley 1 has a step D between the recess 12 and the side surface of the flange 13, as shown in FIG. It is formed.

Like the first pulley 1, the second pulley 2 has a pulley groove (provided on the outer circumference of the second pulley 2) that can fit into a plurality of ribs 4a (not shown) formed on the inner circumference of the V-ribbed belt 4. It has a groove. Further, a shaft that is linked to a water pump is inserted into a boss portion 21 formed at the center of the second pulley 2 .

Like the second pulley 2, the third pulley 3 has a pulley groove (a groove provided on the outer circumference of the third pulley 3) that can fit into the plurality of ribs 4a formed on the inner circumferential surface of the V-ribbed belt 4. have. Further, a shaft that is interlocked with the compressor is inserted into a boss portion 31 formed at the center of the third pulley 3.

(V-ribbed belt 4)
The V-ribbed belt 4 is a so-called low modulus belt that can be slightly expanded and contracted in its circumferential direction. A low modulus belt has a relatively low modulus of elasticity by using polyamide fibers for its core wires, and can suppress a sudden drop in tension compared to belts with a high modulus of elasticity (so-called high modulus belts). Further, the inner circumferential surface of the V-ribbed belt 4 is provided with a plurality of ribs 4a extending in the circumferential direction and having a V-shaped cross section in the width direction. The plurality of ribs 4a can be fitted into pulley grooves provided on the outer periphery of each of the first pulley 1, second pulley 2, and third pulley 3.

Further, the bold line arrow V in FIG. 8 indicates the running direction of the V-ribbed belt 4, and the rotation direction of the first pulley 1 when the V-ribbed belt 4 runs in this running direction is the rotation direction A (see FIG. 8). The direction opposite to A is defined as a reverse rotation direction B.

(Configuration of belt mounting jig 6)
Next, the configuration of the belt mounting jig 6 used in this embodiment will be explained.

As shown in FIGS. 1 and 2, the belt attachment jig 6 is arranged on the outer periphery of the first pulley 1 with the main body 61 and the belt attachment jig 6 attached to the first pulley 1. , a winding part 62, a guide part 63 that guides the side surface of the V-ribbed belt 4, a presser part 64 that presses the back surface of the V-ribbed belt 4 toward the outer peripheral side of the first pulley, and a side surface of the flange 13 of the first pulley 1. The main structure includes a cover part 65 that covers (part of the side surface of the first pulley 1).

In the following, the direction is defined with the belt attachment jig 6 attached to the first pulley 1. Specifically, the direction of the shaft 1c of the first pulley 1 shown in FIG. 11 is defined as the pulley axial direction, the front side in FIG. 11 is defined as the outer side in the pulley axial direction, and the back side in FIG. 11 is defined as the inner side in the pulley axial direction. Also, the direction from the outer circumference of the first pulley 1 toward the shaft 1c of the first pulley 1 is defined as the pulley radial inner side, and the direction from the shaft 1c of the first pulley 1 toward the outer circumference of the first pulley 1 is defined as the pulley radial outer side. do.

A fitting hole 66 is provided on the rear side (reverse rotation direction B side) of the main body part 61, into which a fitting part 72 of an auxiliary tool 7, which will be described later in the second embodiment, can be press-fitted. The diameter of the fitting hole 66 is formed to be slightly smaller than the diameter of a rod-shaped fitting part 72 of the auxiliary tool 7, which will be described later. When the belt attachment jig 6 is attached to the first pulley 1 , a portion of the bottom (inner side in the pulley axial direction) of the main body 61 comes into contact with the side surface of the flange 13 of the first pulley 1 . Note that in the first embodiment, since the auxiliary tool 7 is not used, the fitting hole 66 does not need to be provided in the main body portion 61.

The winding part 62 is provided to protrude inward in the pulley axial direction from the bottom of the main body part 61, and on the back surface (inside in the pulley radial direction) of the winding part 62, from the outside in the pulley axial direction to the inside in the pulley axial direction. , three ribs 67 (corresponding to rib fitting portions) are provided that fit into pulley grooves provided on the outer peripheral portion of the first pulley 1. That is, the length by which the winding portion 62 projects inward in the pulley axial direction is shorter than the width of the first pulley 1 (the length between the pair of flanges 13). Further, on the back surface of the winding portion 62, an engagement groove 68 in which the flange 13 of the first pulley 1 engages is formed between the three ribs 67 and the back surface of the cover portion 65 (inner side in the pulley axial direction). There is. Further, the back surface of the winding portion 62 is curved in an arc shape along the pulley groove of the first pulley 1 . On the other hand, the surface of the winding portion 62 (outside in the radial direction of the pulley) has a three-dimensional curved surface (details will be described later). When the V-ribbed belt 4 is wound around the first pulley 1, the V-ribbed belt 4 is applied to the surface of the winding portion 62, and is pressed toward the outer circumferential side of the first pulley 1 by the tension of the V-ribbed belt 4.

The guide portion 63 is provided on the front side (rotation direction A side) of the main body portion 61 and protrudes outward from the surface of the winding portion 62 in the pulley radial direction. When the V-ribbed belt 4 is wound around the winding part 62, the guide part 63 comes into contact with the side surface of the V-ribbed belt 4, prevents the V-ribbed belt 4 from shifting, and guides it toward the cover part 65. play a role.

The holding part 64 protrudes inward in the pulley axial direction from the bottom of the main body part 61 so as to face the outer periphery of the first pulley 1 when the belt mounting jig 6 is attached to the first pulley 1. There is. Here, the length of the holding portion 64 that protrudes inward in the pulley axial direction is shorter (smaller) than the length of the winding portion 62 that protrudes inward in the pulley axial direction.

More specifically, the length of the holding portion 64 protruding inward in the pulley axial direction is at least twice the width of the rib 67 (at least the width of the rib 67, the length of two ribs), and The length of the winding part 62 protruding inward in the axial direction of the pulley is shorter than the width of the rib 67 (at least one width of the rib 67 or more shorter). In this embodiment, since three ribs 67 are provided on the back surface of the winding part 62, the length of the presser part 64 protruding inward in the pulley axial direction is twice the width of the ribs 67. (width of rib 67, length of two ribs). In this way, by making the length of the holding part 64 that protrudes inward in the pulley axial direction to be at least two widths of the ribs 67 or more, the holding part 64 can hold the V-ribbed belt 4 around the outer circumference of the first pulley 1. It is possible to secure at least a portion to be pressed to the side. Furthermore, by making the length of the presser portion 64 that protrudes inward in the pulley axial direction shorter than the length of the winding portion 62 that protrudes inward in the pulley axial direction by at least one width of the rib 67, the V-ribbed belt 4 can be In the work of attaching the belt to the first pulley 1, the belt attaching jig 6 can be easily separated from the V-ribbed belt 4 without getting caught. Further, in terms of design, the protruding length of the presser portion 64 can be designed based on the width of the rib 67.

As shown in FIG. 13 (with the auxiliary tool 7 removed from FIG. 13), the holding portion 64 is placed along the outer periphery of the first pulley 1 in the V-ribbed belt 4 that is wound around the winding portion 62. It serves to press the V-ribbed belt 4 (point P in FIG. 13) against the outer periphery of the first pulley 1 so that the V-ribbed belt 4 comes into close contact with the outer periphery of the first pulley 1.

The cover part 65 extends longer than the width of the V-ribbed belt 4 from the main body part 61 in the rotational direction A along the side surface of the flange 13 when the belt mounting jig 6 is attached to the first pulley 1. The outer side of the cover portion 65 in the pulley radial direction has a shape along the edge of the flange 13. In this embodiment, the pulley has a straight shape when viewed from the outside in the axial direction, but it may have an arc shape along the edge of the flange 13. Further, the back surface (inner side in the pulley axial direction) of the cover portion 65 comes into contact with the side surface of the flange 13 of the first pulley 1 . Further, the surface of the cover portion 65 (outside in the pulley axial direction) has a three-dimensional curved surface. This cover portion 65 serves to prevent the inner circumferential surface of the V-ribbed belt 4 wound thereon from coming into direct contact with the side surface of the flange 13 of the first pulley 1 and being damaged.

As shown at point P2 in FIG. 13, when the V-ribbed belt 4 is wrapped around the V-ribbed belt 4, the cover portion 65 extending longer than the width of the V-ribbed belt 4 is inserted between the inner peripheral surface of the V-ribbed belt 4 and the side surface of the flange 13. By adopting a configuration in which the V-ribbed belt 4 is inserted, the inner circumferential surface of the V-ribbed belt 4 and the side surface of the flange 13 are separated by the thickness of the cover portion 65 and do not come into direct contact with each other. This separation is caused by the fact that in a series of winding operations of the V-ribbed belt 4, the V-ribbed belt 4, which is stretched between the second pulley 2 and the first pulley 1, moves from the inside of the pulley in the radial direction on the side surface of the first pulley 1. When moving outward, the V-ribbed belt 4 can be maintained until it passes through the step D between the recess 12 and the side surface of the flange 13. As a result, the V-ribbed belt 4 passes through the step D smoothly, and twisting and damage caused by the V-ribbed belt 4 being caught on the step D can be prevented.

Here, the surface of the winding portion 62 and the surface of the cover portion 65 have an integral three-dimensional curved surface. Specifically, the V-ribbed belt 4 placed along the outer circumference of the first pulley 1 is once guided outward in the pulley radial direction, and the V-ribbed belt 4 guided outward in the pulley radial direction is bent (approximately) outward in the pulley axial direction. The V-ribbed belt 4 is guided so that the inner peripheral surface of the V-ribbed belt 4 follows the side surface of the first pulley 1, and the V-ribbed belt 4 is bent in the process of being guided. It is a three-dimensional curved surface that comes into contact with the inner circumferential surface of the V-ribbed belt 4 so that pressure is evenly applied thereto.

In other words, the integral three-dimensional curved surface of the surface of the winding part 62 and the surface of the cover part 65 is formed by fixing one end of a strip of paper horizontally and temporarily fixing the other end, as shown in FIG. When the paper is floated upward and bent approximately 90 degrees on a horizontal plane, and also bent downward, it can be bent easily without excessive tension being applied to the paper.

(How to use belt mounting jig 6)
Next, a method for attaching the V-ribbed belt 4 using the belt attaching jig 6 will be described with reference to FIGS. 3 to 8. Note that a crank is connected to the boss portion 11 of the first pulley 1 so that the first pulley 1 can be freely rotated manually.

<Procedure (1a)>
First, the V-ribbed belt 4 is wound around the second pulley 2 and the third pulley 3. Then, as shown in FIG. 3, the V-ribbed belt 4 that is wrapped around the second pulley 2 and the third pulley 3 is manually pulled, so that the V-ribbed belt 4 is stretched from the side surface of the first pulley 1 to the outer periphery. Arrange it so that it is passed and maintain this state.

<Procedure (1b)>
Next, as shown in FIG. 3, with the inner peripheral surface of the V-ribbed belt 4 facing the outer periphery of the first pulley 1, the holding part 64 of the belt mounting jig 6 faces the outer periphery of the V-ribbed belt 4, and the The belt attachment jig 6 is inserted from the side of the V-ribbed belt 4 so that the hanging portion 62 faces the inner circumference of the V-ribbed belt 4.

<Procedure (1c)>
Then, as shown in FIG. 4, the belt mounting jig 6 inserted into the side surface of the V-ribbed belt 4 is slid in the rotation direction A along the outer periphery of the first pulley 1. Thereby, the belt attachment jig 6 is fixed in a state where it is sandwiched between the outer periphery of the first pulley 1 and the V-ribbed belt 4 due to the tension of the V-ribbed belt 4 . That is, with the belt attachment jig 6 fixed to the first pulley 1, the V-ribbed belt 4 is temporarily hung on the first pulley 1.

At this time, the V-ribbed belt 4 is guided from the surface of the winding part 62 of the belt mounting jig 6 by the guide part 63 and is placed along the surface of the cover part 65, so that the inner peripheral surface of the V-ribbed belt 4 is aligned with the surface of the first pulley 1. It is temporarily hung on the first pulley 1 in a state where it faces the side.

Here, since the surface of the winding portion 62 and the surface of the cover portion 65 have three-dimensional curved surfaces, the winding portion 62 of the belt mounting jig 6 and the cover The pressure that the portion 65 receives can be made uniform. As a result, the belt mounting jig 6 can be easily pressed against the first pulley 1 without applying excessive tension to the V-ribbed belt 4, and the fitting between the belt mounting jig 6 and the first pulley 1 is ensured. It can be done.

In addition, by wrapping the V-ribbed belt 4 with the inner peripheral surface facing the side surface of the first pulley 1, the V-ribbed belt 4 (the front side of the second pulley 2) wound around the second pulley 2 is strongly A pressing force is applied to the outer periphery of the pulley 2 to prevent the V-ribbed belt 4 from coming off the flange of the second pulley 2.

<Procedure (1d)>
Next, a crank (not shown) is connected to the boss portion 11 of the first pulley 1, and the first pulley 1 is rotated in the rotation direction A from the state shown in FIG. 4 to the state shown in FIG. Then, high tension is generated in the V-ribbed belt 4 due to the stretching. The tension of the V-ribbed belt 4 acts as a pressing action that presses the winding part 62 against the outer periphery of the first pulley 1. This makes the fit with the pulley groove provided in the pulley groove stronger. This stabilizes the close contact between the belt attachment jig 6 and the first pulley 1.

At this time, the V-ribbed belt 4 on the immediate rear side (reverse rotation direction B side) of the belt mounting jig 6 is pressed by the presser part 64, so that the rib 4a on the inner peripheral surface of the V-ribbed belt 4 is moved around the outer periphery of the first pulley 1. It comes into close contact with the pulley groove provided on the surface. As a result, when the V-ribbed belt 4 has started to be wound around the first pulley 1, the V-ribbed belt 4 immediately behind the belt mounting jig 6 is lifted off the first pulley 1, and the V-ribbed belt 4 is attached to the first pulley 1. It can be prevented from climbing over the flange 13 and coming off.

Continuously, the first pulley 1 is rotated in the rotation direction A so that the state shown in FIG. 5 becomes the state shown in FIG. At this time, the cover portion 65 extending longer than the width of the V-ribbed belt 4 fits between the inner peripheral surface of the V-ribbed belt 4 and the side surface of the flange 13. Thereby, the inner circumferential surface of the V-ribbed belt 4 and the side surface of the flange 13 are separated by the thickness of the cover portion 65 and do not come into direct contact with each other. This separation is caused by the fact that in a series of winding operations of the V-ribbed belt 4, the V-ribbed belt 4, which is stretched between the second pulley 2 and the first pulley 1, moves from the inside of the pulley in the radial direction on the side surface of the first pulley 1. When moving outward, the V-ribbed belt 4 can be maintained until it passes through the step D between the recess 12 and the side surface of the flange 13 (see point C in FIGS. 5 and 6). ). As a result, the V-ribbed belt 4 passes through the step D smoothly, and twisting and damage caused by the V-ribbed belt 4 being caught on the step D can be prevented.

Furthermore, the first pulley 1 is rotated in the rotation direction A so that the state shown in FIG. 6 becomes the state shown in FIG. Then, the V-ribbed belt 4 that was on the side surface of the first pulley 1 climbs over the flange 13 and moves to the surface of the winding portion 62.

At this time, since the V-ribbed belt 4 is pressed against the outer circumferential side of the first pulley 1 by the holding part 64, the V-ribbed belt 4 immediately behind the belt mounting jig 6 (on the reverse rotation direction B side) is pressed against the first pulley 1. It is possible to prevent the pulley 1 from climbing over the flange 13 and coming off.

Furthermore, the first pulley 1 is rotated in the rotation direction A so that the state shown in FIG. 7 becomes the state shown in FIG. Then, the V-ribbed belt 4 leaves the belt attachment jig 6 and moves to the outer periphery of the first pulley 1. At this time, the length of the holding part 64 that protrudes inward in the axial direction of the pulley is shorter than the length of the wrapping part 62 that protrudes inward in the axial direction of the pulley, and is the minimum length that maintains the pressing function of the V-ribbed belt 4. (In this embodiment, the length is set to twice the width of the rib 67.) Therefore, the V-ribbed belt 4 can be detached from the presser portion 64 relatively easily.

Thereafter, the belt attachment jig 6 is collected.

By going through the above procedure, the V-ribbed belt 4 can be wound between the first pulley 1, the second pulley 2, and the third pulley 3, as shown in FIG.

According to the above method, the belt attachment jig 6 can be easily pressed onto the first pulley 1 without applying excessive tension to the V-ribbed belt 4, and the belt attachment jig 6 can be securely attached to the first pulley 1. can be fixed to. Further, it is possible to prevent the V-ribbed belt 4 from climbing over the edge (flange 13) of the first pulley 1 and coming off. Further, the belt attachment jig 6 can be easily separated from the V-ribbed belt 4 when the winding operation of the V-ribbed belt 4 around the first pulley 1 is completed.

(Second embodiment)
A second embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 9, the second embodiment is a jig in which an auxiliary tool 7 is attached to the belt mounting jig 6 according to the first embodiment. A V-ribbed belt 4 that can be expanded and contracted in the circumferential direction is wrapped around the first pulley 1, second pulley 2, and third pulley 3 (3-axis layout) with all the distances between the axes fixed. to be used on occasion. Note that the configuration of the three-axis layout configured by the first pulley 1, second pulley 2, and third pulley 3 is the same as in the first embodiment.

(Configuration of belt mounting jig 6)
Next, the configuration of the belt mounting jig 6 used in the second embodiment will be explained. The configuration of this belt attachment jig 6 is the same as that of the first embodiment except that it is attached to an auxiliary tool 7, which will be described later, so a description thereof will be omitted.

Note that a fitting hole 66 into which a fitting part 72 of an auxiliary tool 7 to be described later is press-fitted is provided on the rear side (reverse rotation direction B side) of the main body 61 of the belt attachment jig 6 according to the second embodiment. It is provided. The diameter of the fitting hole 66 is formed to be slightly smaller than the diameter of a rod-shaped fitting part 72 of the auxiliary tool 7, which will be described later.

(Configuration of auxiliary tool 7)
As shown in FIG. 14, the auxiliary tool 7 uses the rotation of the first pulley 1 to move the V-ribbed belt 4, which is wound around the second pulley 2 and the third pulley 3, to the last remaining first pulley 1. A belt attachment jig 6, which is used when winding the belt, is used to fix it to the first pulley 1.

Specifically, as shown in FIGS. 9 and 10, the auxiliary tool 7 has an end shape having a ring-shaped portion 71 that is expandable and contractible in the radial direction and is formed by processing an iron round bar material. are doing. The annular portion 71 has a circular shape along the inner wall 12b of the recess 12 of the first pulley 1, and the outer diameter of the annular portion 71 is in the uncontracted state (no external force is applied to the annular portion 71). The inner diameter φ of the recess 12 provided on the side surface of the first pulley 1 is designed to be slightly larger than the inner diameter φ when the first pulley 1 is not in use (see FIG. 10). For this reason, the annular portion 71 is in a contracted state (a state in which a load is applied such that the outer diameter of the annular portion 71 is elastically deformed and reduced), the bottom surface 12a of the recess 12 provided on the side surface of the first pulley 1 ( The inner wall 12b can be pressed while in contact with the bottom part).

Further, one end of the auxiliary tool 7 has a cross section that extends outward in the radial direction from the annular portion 71 and is slightly larger than the diameter of the fitting hole 66 provided on the side surface of the main body portion 61 of the belt attachment jig 6. A rod-shaped fitting portion 72 is formed by processing. By press-fitting the fitting portion 72 into the fitting hole 66, the belt attachment jig 6 is attached to the auxiliary tool 7.

Further, at the other end of the auxiliary tool 7, there is an L-shaped engagement portion 73 that engages with any of the six through holes 12c provided in the bottom surface 12a of the recess 12 of the first pulley 1. Processed and formed. Since the L-shaped tip of the engaging portion 73 protrudes in the direction of the axis (axis 1c), the L-shaped tip of the engaging portion 73 can be engaged with the edge of the through hole 12c of the first pulley 1. can be combined. As a result, when the V-ribbed belt 4 is wound around the first pulley 1, the movement of the auxiliary tool 7 itself in the rotational direction of the first pulley 1 can be restrained, so that the movement of the auxiliary tool 7 itself in the rotational direction of the first pulley 1 can be restrained. Even if a reaction force is applied to the belt mounting jig 6 from the V-ribbed belt 4, it is possible to prevent the belt mounting jig 6 from shifting or slipping from the first pulley 1.

As described above, in the auxiliary tool 7 of this embodiment, each of the annular portion 71, the fitting portion 72, and the engaging portion 73 is formed by bending a single rod-shaped steel material. has been done. Thereby, the cost performance in manufacturing the auxiliary tool 7 can be improved.

The material of the auxiliary tool 7 in this embodiment is iron, but the material is not limited to iron and may be made of stainless steel as long as the outer diameter of the annular portion 71 is variable to the extent that it can be deformed (expanded and contracted) due to spring elasticity. It may also be made of resin. Note that if a high degree of spring elasticity is required to firmly fit the auxiliary tool 7 into the recess 12 of the first pulley 1, or if the auxiliary tool 7 requires a high degree of durability, the auxiliary tool 7 may be Iron is preferred as the material.

Further, the shape of the auxiliary tool 7 is not limited to a round bar as in this embodiment, but may be a rod-shaped material having a polygonal cross section, for example. Further, even if the shape of the annular portion 71 is not a perfect circle (circular shape), it has a shape that fits into the recess 12 of the first pulley 1 and can be expanded and contracted in the radial direction of the first pulley 1 due to spring elasticity. Any shape is fine (semicircle, ellipse, etc.). Further, the L-shaped tip of the engaging portion 73 of the auxiliary tool 7 is placed on the back side of the through hole 12c to the extent that it does not interfere with peripheral devices (components) placed on the back side of the first pulley 1. It may stick out.

(How to use belt mounting jig 6 with auxiliary tool 7)
Next, a method for attaching the V-ribbed belt 4 using the belt attaching jig 6 having the auxiliary tool 7 will be described with reference to FIGS. 10 and 14 to 19. Note that a crank is connected to the boss portion 11 of the first pulley 1 so that the first pulley 1 can be freely rotated manually.

<Procedure (2a)>
First, as shown in FIG. 10, the rod-shaped fitting portion 72 of the auxiliary tool 7 is press-fitted into the fitting hole 66 of the belt mounting jig 6 to attach the belt mounting jig 6 to the auxiliary tool 7.

<Procedure (2b)>
Next, as shown in FIG. 10, in a state in which the annular portion 71 of the assisting tool 7 is contracted in the radial direction (a state in which a load is applied such that the outer diameter of the annular portion 71 is elastically deformed and reduced), the L The tip of the letter-shaped engaging portion 73 is engaged with the edge of the through hole 12c of the first pulley 1. Then, after the contracted ring-shaped portion 71 is brought into contact with the bottom surface 12a of the recess 12 of the first pulley 1, the contraction of the ring-shaped portion 71 is released to fit the ring-shaped portion 71 into the recess 12, The inner wall 12b of the recess 12 is pressed by the annular portion 71. As a result, the auxiliary tool 7 comes into a state in which it strongly contacts the inner wall 12b while remaining in contact with the bottom surface 12a of the recess 12 of the first pulley 1, and is firmly fitted (fixed) to the first pulley 1. Further, the belt attachment jig 6 attached to the auxiliary tool 7 is placed in contact with the outer periphery of the first pulley 1 . That is, the three ribs 67 provided on the back surface of the winding portion 62 of the belt attachment jig 6 are fitted into the pulley groove provided on the outer periphery of the first pulley 1.

In this embodiment, after the belt attachment jig 6 is attached to the auxiliary tool 7, the auxiliary tool 7 is fixed to the first pulley 1, but after the auxiliary tool 7 is fixed to the first pulley 1, The belt attachment jig 6 may be attached to the auxiliary tool 7.

By using the auxiliary tool 7 described above, the auxiliary tool 7 to which the belt attachment jig 6 is attached can be firmly fixed to the first pulley 1. That is, the belt attachment jig 6 can be firmly fixed to the first pulley 1 via the auxiliary tool 7.
Furthermore, by bringing the annular portion 71 into contact with the bottom surface 12a of the recess 12 of the first pulley 1, movement of the belt mounting jig 6 attached to the fitting portion 72 in the axis (axis 1c) direction is also restrained. be able to. This enables appropriate positioning of the belt attachment jig 6 in the axial (axis 1c) direction.
Furthermore, by engaging the tip of the L-shaped engaging portion 73 with the edge of the through hole 12c of the first pulley 1, movement of the auxiliary tool 7 itself in the rotational direction of the first pulley 1 can be restrained. Therefore, even if a reaction force is applied from the V-ribbed belt 4 to the belt mounting jig 6 during the installation operation of the V-ribbed belt 4, which will be described later, the belt mounting jig 6 will not shift from the first pulley 1 or slip. It is possible to prevent this from happening.

<Step (2c)>
Next, the V-ribbed belt 4 is wound around the second pulley 2 and the third pulley 3 while the auxiliary tool 7 to which the belt attachment jig 6 is attached is fixed to the first pulley 1.

<Procedure (2d)>
Next, as shown in FIG. 14, with the inner peripheral surface of the V-ribbed belt 4 facing the side surface of the first pulley 1, insert the V-ribbed belt 4 from the side surface of the first pulley 1 into the cover portion of the belt mounting jig 6. 65, and then the V-ribbed belt 4 is guided by the guide part 63 and along the surface of the winding part 62, and passed between the presser part 64 and the outer periphery of the first pulley 1. temporarily hang it on the first pulley 1. At this point, almost no tension is applied to the V-ribbed belt 4, but since the belt mounting jig 6 is firmly fixed to the first pulley 1 via the auxiliary tool 7, the V-ribbed belt 4 is attached to the belt mounting jig. Even when the V-ribbed belt 4 is temporarily hung on the belt mounting jig 6, the V-ribbed belt 4 can be securely temporarily hung on the belt mounting jig 6 without the belt mounting jig 6 falling off the first pulley 1.

The procedure for temporarily hanging the V-ribbed belt 4 on the first pulley 1 is to first pass the V-ribbed belt 4 between the holding part 64 and the outer periphery of the first pulley 1, and guide the V-ribbed belt 4 with the guide part 63. While doing so, the V-ribbed belt 4 is placed along the surface of the winding part 62, and then the V-ribbed belt 4 is placed along the surface of the cover part 65, so that the inner peripheral surface of the V-ribbed belt 4 is connected to the first pulley 1 from the surface of the cover part 65. It may be placed along the side surface of the first pulley 1 while facing the side surface of the first pulley 1 .

Further, the order of steps (2a) to (2d) above is just an example, and the order does not matter. Further, the belt attachment jig 6 may be attached to the first pulley 1 while the V-ribbed belt 4 is attached to the belt attachment jig 6 (the auxiliary tool 7 may also be attached at this time).

Here, since the surface of the winding part 62 and the surface of the cover part 65 have three-dimensional curved surfaces, the V-ribbed belt 4 is attached from the side of the first pulley 1 to the surface of the cover part 65 of the belt mounting jig 6. Then, when the V-ribbed belt 4 is guided by the guide part 63 and placed along the surface of the winding part 62, the winding part of the belt mounting jig 6 is removed from the inner peripheral surface of the bent V-ribbed belt 4. 62 and the cover portion 65 can be made uniform. As a result, the belt mounting jig 6 can be easily pressed against the first pulley 1 without applying excessive tension to the V-ribbed belt 4, and the fitting between the belt mounting jig 6 and the first pulley 1 is ensured. It can be done.

In addition, by wrapping the V-ribbed belt 4 with the inner peripheral surface facing the side surface of the first pulley 1, the V-ribbed belt 4 (the front side of the second pulley 2) wound around the second pulley 2 is strongly A pressing force is applied to the outer periphery of the pulley 2 to prevent the V-ribbed belt 4 from coming off the flange of the second pulley 2.

<Step (2e)>
Next, a crank (not shown) is connected to the boss portion 11 of the first pulley 1, and the first pulley 1 is rotated in the rotation direction A from the state shown in FIG. 14 to the state shown in FIG. Then, high tension is generated in the V-ribbed belt 4 due to the stretching. The tension of the V-ribbed belt 4 acts as a pressing action that presses the winding part 62 against the outer periphery of the first pulley 1. This makes the fit with the pulley groove provided in the pulley groove stronger. This stabilizes the close contact between the belt attachment jig 6 and the first pulley 1.

At this time, the fitting part 72 of the auxiliary tool 7 (the side on which the belt attachment jig 6 is attached) is pulled back in the reverse rotation direction B, that is, the direction in which the outer diameter of the ring-shaped portion 71 of the auxiliary tool 7 is expanded. By receiving this, the annular portion 71 of the auxiliary tool 7 is pressed even more strongly against the inner wall 12b of the recess 12 of the first pulley 1. Therefore, even during the installation operation of the V-ribbed belt 4, the auxiliary tool 7 and the belt installation jig 6 do not slip between them and the first pulley 1, and do not fall off from the first pulley 1, resulting in a more stable The V-ribbed belt 4 can be shifted.

Further, the V-ribbed belt 4 on the immediate rear side (reverse rotation direction B side) of the belt mounting jig 6 is pressed by the presser part 64, so that the rib 4a on the inner circumferential surface of the V-ribbed belt 4 is pressed against the outer circumferential surface of the first pulley 1. It is in a state where it is tightly fitted into the pulley groove provided in the. As a result, when the V-ribbed belt 4 has started to be wound around the first pulley 1, the V-ribbed belt 4 immediately behind the belt mounting jig 6 is lifted off the first pulley 1, and the V-ribbed belt 4 is attached to the first pulley 1. It can be prevented from climbing over the flange 13 and coming off. Furthermore, since the belt attachment jig 6 is attached to the auxiliary tool 7, the belt attachment jig 6 itself can be firmly attached to the first pulley 1 without being lifted up.

Continuously, the first pulley 1 is rotated in the rotation direction A from the state shown in FIG. 15 to the state shown in FIG. 16. At this time, the cover portion 65 extending longer than the width of the V-ribbed belt 4 fits between the inner peripheral surface of the V-ribbed belt 4 and the side surface of the flange 13. Thereby, the inner circumferential surface of the V-ribbed belt 4 and the side surface of the flange 13 are separated by the thickness of the cover portion 65 and do not come into direct contact with each other. This separation is caused by the fact that in a series of winding operations of the V-ribbed belt 4, the V-ribbed belt 4, which is stretched between the second pulley 2 and the first pulley 1, moves from the inside of the pulley in the radial direction on the side surface of the first pulley 1. When moving outward, the V-ribbed belt 4 can be maintained until it passes through the step D between the recess 12 and the side surface of the flange 13 (see point C in FIGS. 15 and 16). ). As a result, the V-ribbed belt 4 passes through the step D smoothly, and twisting and damage caused by the V-ribbed belt 4 being caught on the step D can be prevented.

Furthermore, the first pulley 1 is rotated in the rotation direction A so that the state shown in FIG. 16 becomes the state shown in FIG. 17. Then, the V-ribbed belt 4 that was on the side surface of the first pulley 1 climbs over the flange 13 and moves to the surface of the winding portion 62.

At this time, since the V-ribbed belt 4 is pressed against the outer circumferential side of the first pulley 1 by the holding part 64, the V-ribbed belt 4 immediately behind the belt mounting jig 6 (on the reverse rotation direction B side) is pressed against the first pulley 1. It is possible to prevent the pulley 1 from climbing over the flange 13 and coming off. Furthermore, at this stage, the holding part 64 is in a situation where it receives the strongest pushing up force from the V-ribbed belt 4, but the auxiliary tool 7 attached to the belt attachment jig 6 is fixed to the first pulley 1. By doing so, it is possible to prevent the belt mounting jig 6 from lifting up on the immediate rear side (on the reverse rotation direction B side).

Furthermore, the first pulley 1 is rotated in the rotation direction A so that the state shown in FIG. 17 becomes the state shown in FIG. Then, the V-ribbed belt 4 leaves the belt attachment jig 6 and moves to the outer periphery of the first pulley 1. At this time, the length of the holding part 64 that protrudes inward in the axial direction of the pulley is shorter than the length of the wrapping part 62 that protrudes inward in the axial direction of the pulley, and is the minimum length that maintains the pressing function of the V-ribbed belt 4. (In this embodiment, the length is set to twice the width of the rib 67.) Therefore, the V-ribbed belt 4 can be detached from the presser portion 64 relatively easily.

Furthermore, when the shift operation of the V-ribbed belt 4 to the first pulley 1 is completed, the pressing action from the V-ribbed belt 4 to the belt mounting jig 6 is removed, so that at that moment, the V-ribbed belt 4 is firmly shifted to the first pulley 1. The adhesion force of the fixed auxiliary tool 7 to the first pulley 1 is slightly weakened. This causes a pop-up operation in which the belt mounting jig 6, together with the auxiliary tool 7, is slightly lifted diagonally upward toward the outside in the axial direction of the pulley and the outside in the radial direction of the pulley. Due to this pop-up operation, the V-ribbed belt 4 can be more smoothly removed from the presser part 64, and since the belt mounting jig 6 is attached to the auxiliary tool 7, it will not fall off the first pulley 1. There isn't.

Thereafter, the first pulley 1 is rotated in the rotational direction A so that the state shown in FIG. 18 becomes the state shown in FIG. to recover.

By going through the above procedure, the V-ribbed belt 4 can be wound between the first pulley 1, the second pulley 2, and the third pulley 3, as shown in FIG.

According to the above method, in a series of operations for winding the V-ribbed belt 4 between the first pulley 1, the second pulley 2, and the third pulley 3, the belt mounting jig 6 having the auxiliary tool 7 can be used. , the belt attachment jig 6 can be reliably fixed to the first pulley 1. Furthermore, during the installation work of the V-ribbed belt 4, the V-ribbed belt 4 can be maintained in a state where it is firmly pressed against the first pulley 1, and the V-ribbed belt 4 can be worked in a comfortably bent form without being subjected to excessive tension. . As a result, the reliability and safety of the V-ribbed belt 4 installation work can be greatly improved.

(Other embodiments)
In the auxiliary tool 7 of this embodiment, the annular portion 71, the fitting portion 72, and the engaging portion 73 are formed by bending a single rod-shaped steel material. The auxiliary tool 7 may be manufactured by combining the annular portion 71, the fitting portion 72, and the engaging portion 73 as separate members.

Further, in this embodiment, the first pulley 1 (crank pulley) having the largest diameter is used as an example of the pulley on which the auxiliary tool 7 to which the belt mounting jig 6 is attached is attached and the V-ribbed belt 4 is finally wound. However, the present invention is not limited to this, and the auxiliary tool 7 is applicable to any pulley (having a recess on the side surface of the pulley into which the ring-shaped portion 71 can be fitted or a through hole into which the engaging portion 73 of the auxiliary tool 7 can be engaged). If applicable, it can be applied. Therefore, the present invention can also be applied to the second pulley 2 (water pump pulley) and third pulley 3 (air conditioner pulley), which have a smaller diameter than the first pulley 1.

Regarding the recess 12 into which the annular portion 71 of the auxiliary tool 7 is fitted, in this embodiment, the first pulley 1 in which one recess 12 is formed has been described as an example, but there are multiple recesses on the side surface of the pulley. If the recess is formed stepwise in the pulley axial direction, the recess into which the annular portion 71 of the auxiliary tool 7 is fitted may be selected as appropriate. For example, as shown in FIG. 20, when two recesses (a first recess and a second recess) are formed in a step-like manner in the pulley axial direction on the side surface of the pulley, the annular portion 71 of the auxiliary tool 7 is , may be designed to fit into the first recess formed at the shallowest location, or may be designed to fit into the second recess formed at the deepest location (see FIG. 20). .

In addition, in this embodiment, an example of application to a three-axis pulley layout consisting of a first pulley 1, a second pulley 2, and a third pulley 3 in which the distances between the axes are all fixed. However, it may be applied to a pulley layout other than three axes (a two-axis pulley layout or a four-axis or more pulley layout may be used).

In addition, in this embodiment, a method of attaching a belt using a V-ribbed belt 4 as a belt to be wrapped around a pulley has been described, but the belt type is not limited to a V-ribbed belt, and for example, a flat belt, a V-belt, etc. can be attached to a pulley. It can also be applied when

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be implemented with various modifications within the scope of the claims.

1 First pulley 11 Boss portion 12 Recessed portion 12a Bottom surface 12b Inner wall 12c Through hole 13 Flange 2 Second pulley 3 Third pulley 4 V-ribbed belt 6 Belt mounting jig 61 Main body portion 62 Winding portion 63 Guide portion 64 Holding portion 65 Cover portion 66 Fitting hole 67 Rib 68 Engagement groove 7 Auxiliary tool 71 Annular part 72 Fitting part 73 Engagement part A Rotation direction B Reverse rotation direction D Step

Claims (4)

A belt mounting jig used for wrapping a circumferentially expandable belt between multiple pulleys,
The main body and
The belt mounting jig is provided on the main body, and is placed on the outer periphery of the pulley with the belt mounting jig attached to the pulley to be mounted, and when the belt is hung, the tension of the belt causes the pulley to a wrapping portion that is pressed toward the outer circumference;
a guide portion that guides a side surface of the belt wrapped around the wrapping portion;
a presser portion that is arranged to face the outer periphery of the pulley when the belt mounting jig is attached to the pulley and presses the belt wound around the pulley toward the outer periphery of the pulley; ,
a cover portion that covers a side surface of the pulley;
The winding part and the cover part guide the belt, which is placed along the outer periphery of the pulley, to the outside in the radial direction of the pulley, and guide the belt, which is guided to the outside in the radial direction of the pulley, to the axis of the pulley. While bending the belt outwardly, the belt is also bent inwardly in the radial direction of the pulley, and is guided along the side surface of the pulley, and the belt is bent uniformly from the inner circumferential surface of the belt that bends in the process of being guided. It has a three-dimensional curved surface that contacts so as to apply pressure,
The cover portion extends along a side surface of the pulley toward the front in the rotational direction of the pulley for a longer length than the widthwise length of the belt,
The holding portion has a length that projects from the axially outer side of the pulley to the axially inner side of the pulley and is smaller than the length of the wrapping portion that protrudes from the axially outer side of the pulley to the axially inner side of the pulley. . It has an auxiliary tool to be fixed to the pulley to be attached,
The auxiliary device is
It has an end shape with a ring-shaped part that can be expanded and contracted in the radial direction,
The outer diameter of the annular portion is larger than the inner diameter of a bottomed cylindrical recess provided on a side surface of the pulley when no external force is applied;
The annular portion is capable of pressing the inner wall of the recess while in contact with the bottom of the recess in a radially contracted state;
The belt attachment jig according to claim 1, wherein the main body portion can be attached to one end. A method for attaching a belt, comprising using the belt attaching jig according to claim 1 to wrap a circumferentially expandable belt between a plurality of pulleys,
a step of winding the belt around a pulley other than the pulley to be attached;
The cover part is guided by the guide part from the surface of the winding part, with the pressing part facing the outer periphery of the belt and the winding part facing the inner periphery of the belt. a step of temporarily hanging the belt on the pulley with the inner circumferential surface of the belt facing the side surface of the pulley along the surface of the belt;
How to install the belt, including: A method for attaching a belt, comprising using a belt attaching jig having an auxiliary tool according to claim 2 to wrap a circumferentially expandable belt between a plurality of pulleys,
After the annular portion is contracted and brought into contact with the bottom of a bottomed cylindrical recess provided on the side surface of the pulley to be attached, the annular portion is released from the contraction. pressing the ring-shaped portion against the inner wall of the recess and fixing the wrapping portion along the outer periphery of the pulley;
a step of winding the belt around a pulley other than the pulley to be attached;
With the inner circumferential surface of the belt facing the side surface of the pulley, the belt is guided from the side surface of the pulley to the cover section, and further, the belt is guided along the winding section while being guided by the guide section. temporarily hanging the belt by passing it between the pressing part and the outer periphery of the pulley;
a procedure for rotating the pulley;
How to install the belt, including:

Images