JP7352508B2 - Belt mounting jig - Google Patents

Description

The present invention relates to a belt mounting jig used when winding a belt between a plurality of pulleys.

Generally, in a belt transmission mechanism in which a belt is wound between multiple pulleys, in order to reliably transmit power between the pulleys, the belt circumference is made shorter than the layout circumference between the pulleys to be attached. The design is such that strong tension is applied to the belt.

In such a belt transmission mechanism, in a layout that does not use a tension pulley or the like that can adjust the axis position of the pulley, the layout between multiple pulleys with all the distances between their axes fixed is Attaching a belt with a circumference shorter than the circumference requires a force that resists the tension of the belt, which can be time-consuming. This kind of effort can be avoided by attaching the belt to a multi-stage pulley in which multiple pulleys are arranged in parallel in the axial direction, or a pulley with a large diameter on the back side of the pulley in which large and small diameter pulleys are combined (see Figures 1(a) and 4). This becomes even more noticeable when wrapping.

A belt mounting jig used to shift the belt wound around the front pulley to the rear pulley in such a multi-stage pulley in which a plurality of pulleys are arranged in parallel in the axial direction is disclosed in Patent Document 1, Patent Document 1, It is described in Document 2 and Patent Document 3.

Patent Document 1 discloses that the belt is once wound around a pulley in front of the first pulley, which is a two-step pulley, to position the belt in front of the first pulley, and in this state, a locking portion of a belt mounting jig is attached to the second pulley. Hold the pulley flange in place and attach the belt without hooking it to the front side. After that, the belt attachment jig is reattached to the first pulley, the belt wrapped around the front pulley is shifted to the back pulley, and the belt is attached to the back pulley of the two-stage pulley. In this way, the belt can be easily attached while preventing the belt from getting caught on the side surface of the front pulley of the two-stage pulley.

In Patent Document 2, the belt mounting jig is fitted into the groove of the front pulley at the bottom of the belt mounting jig, and the belt is lifted on the guide surface and shifted to the back pulley, but at this time the belt comes off toward the front. It is characterized by being provided with a stopper to prevent it from coming off.

Patent Document 3 discloses a main body installed on the outer peripheral surface of the front pulley, and a lifting surface located outside the main body in the pulley radial direction and outside the outer peripheral surface of the back pulley in the pulley radial direction. and a guide portion having a guide surface that slopes inward in the pulley radial direction from the belt contact portion toward the back side in the pulley axial direction so as to straddle the front pulley and the back side. A belt mounting jig is disclosed.

Patent No. 4988619 Patent No. 5090961 JP2017-223310A

In the belt mounting jigs described in Patent Document 1 and Patent Document 2, the guide surface is formed so that the front end of the jig main body in the pulley rotation direction becomes thinner and tapered toward the front end, so that the belt attached to the pulley on the front side is It has a function to smoothly ride on the pulley and guide it into the pulley groove of the back pulley.

However, when the pulley is further rotated in the rotational direction, as the belt mounting jig bites into the space between the belt and the pulley, the belt mounting jig will move backward from the rear end of the tapered part in the rotational direction of the pulley. There are multiple parts located outside the outer diameter of the flange part at the boundary of the side pulley (in Patent Document 1, there are two parts, the guide surface [figure 8] and the protrusion [figure 7]), or they are continuous. The belt moves from the front pulley to the back pulley due to the existence of the part formed by the belt (in Patent Document 2, the arcuate ridge line forming the top part [figure 6a] of the stopper [figure 6]). In the process, the back surface of the belt is subjected to excessive thrust force from the belt mounting jig, which may cause permanent distortion in the belt.

Furthermore, in the belt mounting jigs described in Patent Document 1 and Patent Document 2, the guide surface is only formed on the front pulley side, and a device that actively guides the belt is installed on the back pulley. It has not been. Therefore, in some cases, it may not be possible to reliably shift the belt to the back pulley.

Furthermore, in the belt mounting jig described in Patent Document 3, since the guide surface is formed to straddle the front pulley side and the back pulley side, when moving the belt from the front pulley side to the back pulley side, , it is possible to reliably pass above the flange portion at the boundary between the front pulley and the back pulley and complete the movement into the groove of the back pulley.

However, the belt contact part [figure 12] that connects to the lifting surface [figure 15] of the belt mounting jig has a front end in the pulley rotation direction (which is not tapered) on the outer peripheral surface of the back pulley. Because the belt is located on the outside of the The belt will be subjected to excessive upthrust force from the tool, causing permanent distortion, and depending on how the belt mounting jig is installed, the belt mounting jig may be damaged while the belt is moving from the front pulley to the back pulley. There is a risk that the tool may be lifted off the pulley, or in the worst case, the belt mounting jig may come off the pulley.

In this way, when wrapping a belt around the back pulley of a two-stage pulley, the method used is to first wrap it around the front pulley and then shift the belt wrapped around the front pulley to the back pulley. . The reason why the belt passes through the front pulley instead of wrapping around the back pulley all at once is that the front pulley is offset from the belt running line connecting the back pulley and the base pulley (see Figure 1). If this offset becomes large, it is difficult to attach the belt during the process of attaching the belt. In addition, if the offset is large like this, wrapping the belt around the back pulley at once will stretch the belt excessively and apply a large load, which may cause permanent distortion of the belt. This is one of the reasons why the wire is routed through the front pulley instead of being wrapped around the back pulley all at once.

For this reason, a belt mounting jig is used as a means to facilitate the work of winding the belt around the back pulley of the two-stage pulley.

However, in the case of the belt mounting jig described in the above-mentioned patent document, the guide surface located outside the outer peripheral surface of the back pulley has a dominant surface contact with the back surface of the belt, or a dominant line contact in the circumferential direction of the pulley. The design is such that the belt is shifted to the back pulley while making contact with the target (see the area of surface contact in Figure 1(b)), so use a belt mounting jig to shift the belt from the front pulley side. When the belt is shifted to the back pulley, an excessive pushing force from the belt mounting jig will be applied to the back side of the belt, which may cause permanent distortion in the belt.

Therefore, the present invention has been developed to provide a multi-step pulley in which a front (small diameter part) pulley and a rear (large diameter part) pulley are arranged in parallel in the axial direction, and when a belt is wound between the base pulley and the base pulley. It facilitates the work of shifting the belt wrapped between the front pulley and the front (small diameter part) pulley from the front pulley to the back pulley, and also prevents the belt mounting jig from pushing up the back side of the belt when shifting. The purpose of the present invention is to provide a belt mounting jig that can minimize force.

One of the inventions for solving the above problems is to provide a multi-stage pulley in which a plurality of pulleys including at least a front pulley and a back pulley are arranged in parallel in the central axis direction of the pulley, and a base pulley. A belt mounting jig used to shift the belt wound between the base pulley and the front pulley from the front pulley to the back pulley when winding the circumferentially expandable belt. And,
a main body portion having a shape that follows the outer peripheral surface of the front pulley;
a belt scoop receiving surface provided on the main body portion and inserted between the outer circumferential surface of the front pulley and the back surface of the belt wound around the front pulley;
With the main body section along the outer circumferential surface of the front pulley, the main body section is provided at a height position outside of the outer circumferential surface of the back pulley, and is introduced from the belt scoop receiving surface. a belt support part that makes line contact with the back side of the belt;
The main body portion is provided along the outer peripheral surface of the front pulley at a position straddling the front pulley and the rear pulley so as to be inclined from the belt support portion toward the outer peripheral surface of the rear pulley. and a belt guide portion that is in line contact with the back surface of the belt that is slid from the belt support portion.

According to the above configuration, when shifting the belt wound between the base pulley and the front pulley from the front pulley to the back pulley, the main body is aligned with the outer peripheral surface of the front pulley and the belt mounting jig is moved. By installing the belt and rotating the multi-stage pulley, the belt scooping and receiving surface can be inserted between the outer peripheral surface of the front pulley and the back surface of the belt, and the belt can be lifted. At this time, the belt strongly presses against the belt scoop receiving surface due to the reaction of lifting the belt, which causes the belt mounting jig to tightly adhere to the front pulley, preventing the belt mounting jig from coming off or shifting from the front pulley. be able to.
By further rotating the multi-stage pulley, the belt support section comes into line contact with the back side of the belt lifted by the belt scoop receiving surface, supporting the belt at a height position outside of the outer peripheral surface of the back pulley. be able to. At this time, since the belt support section is in line contact with the back surface of the belt, it is possible to avoid applying excessive tension to the belt.
In addition, the belt guide section is inclined from the belt support section toward the outer peripheral surface of the back pulley at a position where it straddles the front pulley and the back pulley, and the belt supported by the belt support section is Since the contraction force is applied in the direction, by further rotating the multi-stage pulley, it is possible to slide the belt from the belt support part to the outer peripheral surface of the back pulley while making line contact with the slope of the belt guide part. can. At this time, since the belt guide portion is inclined toward the outer circumferential surface of the back pulley, the belt can be reliably wound around the outer circumferential surface of the back pulley. In addition, since the belt guide part makes linear contact with the back side of the belt, the belt can be installed smoothly while sliding from the belt support part to the back pulley in the shortest route, which prevents excessive tension from being applied to the belt. This makes it possible to install the device without causing permanent deformation.

Further, the present invention provides the belt mounting jig, which includes:
The belt scoop receiving surface is
The main body portion is tapered in a direction that extends between the outer peripheral surface of the front pulley and the back surface of the belt wound around the front pulley when the main body portion is aligned with the outer peripheral surface of the front pulley. Good too.

According to the above configuration, the belt scoop receiving surface can be smoothly inserted between the outer peripheral surface of the front pulley and the back surface of the belt, and the belt can be lifted without applying an excessive load.

Further, the present invention provides the belt mounting jig, which includes:
The belt guide portion may be provided with a first locking portion on an inner peripheral surface side that locks an outer peripheral surface of the back pulley and an inner peripheral surface of the belt guide portion.

According to the above configuration, the first locking portion provided on the inner circumferential surface of the belt guide portion can be locked on the outer circumferential surface of the back pulley, so that the belt mounting jig can be attached to the multi-step pulley. It can be reliably installed on the outer periphery of the constituent back pulley.

Further, the present invention provides the belt mounting jig, which includes:
The main body portion may be provided with a second locking portion on the inner peripheral surface side that locks the outer peripheral surface of the front pulley and the inner peripheral surface of the main body portion.

According to the above configuration, the second locking portion provided on the inner peripheral surface of the main body can be locked on the outer peripheral surface of the front pulley, so that the belt mounting jig constitutes a multi-stage pulley. It can be reliably installed on the outer periphery of the front pulley.

Further, the present invention provides the belt mounting jig, which includes:
With the main body section along the outer circumferential surface of the front pulley, the belt slider is slid from the belt scoop receiving surface onto the outer circumferential surface of the back pulley, which is closer to the back pulley than the belt scoop receiving surface. A belt adjusting section is provided that comes into contact with the back side of the belt.
The belt adjusting portion may protrude further toward the back pulley than the belt guide portion.

According to the above configuration, the belt adjusting section can support the back surface of the belt over a wide range of belt width until just before the belt shift operation from the front pulley to the back pulley is completed. Thereby, it is possible to prevent the belt from twisting or overturning just before the shift operation of the belt from the front pulley to the rear pulley is completed.

FIG. 3 is an explanatory diagram of a layout in which a belt is wound around a two-stage pulley and a base pulley. FIG. 3 is a perspective view of the belt mounting jig according to the present embodiment viewed from a different direction. It is a six-sided view of the belt attachment jig concerning this embodiment. It is an explanatory view of a two-stage pulley used in this embodiment. This is a three-axis layout of an automobile engine described in this embodiment. It is an explanatory view of how to use the belt attachment jig concerning this embodiment. It is an explanatory view of how to use the belt attachment jig concerning this embodiment. It is an explanatory view of how to use the belt attachment jig concerning this embodiment. It is an explanatory view of how to use the belt attachment jig concerning this embodiment. It is an explanatory view of how to use the belt attachment jig concerning this embodiment. It is an explanatory view of how to use the belt attachment jig concerning this embodiment. It is an explanatory view of how to use the belt attachment jig concerning this embodiment. It is a six-sided view of the belt attachment jig concerning a modification. It is a six-sided view of the belt attachment jig concerning other embodiments. It is a six-sided view of the belt attachment jig concerning other embodiments.

(Embodiment)
Embodiments of the present invention will be described below with reference to the drawings. The belt attachment jig 9 according to this embodiment is used in a three-axis layout 1 of an automobile engine shown in FIG. Specifically, a two-stage pulley 2 for a water pump (multi-stage pulley: see FIG. 4) in which a front pulley 21 and a back pulley 22 are arranged side by side in the central axis direction, and an auxiliary pulley for an air conditioner. 3 (base pulley) and the drive crank pulley 4 (base pulley), when winding the V-ribbed belt 5 that can be expanded and contracted in the circumferential direction, the belt mounting jig 9 connects the auxiliary pulley 3 and the crank The V-ribbed belt 5, which is wound between the pulley 4 and the front pulley 21, is used to shift from the front pulley 21 to the back pulley 22 (see FIG. 10).

As shown in FIG. 5, a two-stage pulley 2 for a water pump, an auxiliary pulley 3 for an air conditioner, and a crank pulley 4 connected to a crankshaft 41 of an engine, etc. each have a predetermined distance between their axes. They are rotatably supported. Furthermore, the front pulley 21 is located at a position offset from the traveling line of the V-ribbed belt 5 that connects the rear pulley 22, the auxiliary pulley 3, and the crank pulley 4 (offset position). A V-ribbed belt 5 is wound between the rear pulley 22 of the two-stage pulley 2, the auxiliary pulley 3, and the crank pulley 4, and the power of the crankshaft 41 is transmitted from the crank pulley 4 to the two-stage pulley 2. The power is transmitted to the input shaft 23 (for water pump) of the pulley 2. In this embodiment, the distances between the two-stage pulley 2, the auxiliary pulley 3, and the crank pulley 4 are fixed unchangeably, and a so-called auto-tensioner is installed to apply tension to the V-ribbed belt 5. (Tension applying means) is not installed.

(Configuration of double-stage pulley 2)
As shown in FIG. 4, the two-stage pulley 2 is a pulley in which a front pulley 21 and a back pulley 22 having a larger diameter than the front pulley 21 are arranged side by side in the central axis direction to form an integral structure. According to this, the front pulley 21 and the back pulley 22 can rotate in conjunction with each other about the central axis. The outer peripheral surfaces of the front pulley 21 and the rear pulley 22 in the two-stage pulley 2 are provided with a pulley groove 21a and a pulley groove that can fit with a plurality of ribs formed in the circumferential direction on the inner peripheral surface of the V-ribbed belt 5. 22a are formed respectively. Further, the two-stage pulley 2 includes three pulley flanges 2a, 2b, and 2c that sandwich the pulley groove 21a of the front pulley 21 and the pulley groove 22a of the back pulley 22 in the central axis direction. This pulley flange 2a is formed to protrude slightly in the radial direction of the pulley 21 on this side from the pulley groove 21a in a side view of FIG. Further, the pulley flanges 2b and 2c are formed to slightly protrude radially outward of the back pulley 22 from the pulley groove 22a in a side view of FIG. Further, an input shaft 23 for a water pump is inserted into the boss portion 6 of the two-stage pulley 2. Moreover, the code|symbol 2d shows the side surface of the front pulley 21, and the code|symbol 2e shows the side surface of the back|inner side pulley 22.

(V-ribbed belt 5)
The V-ribbed belt 5 is a so-called low modulus belt that can be slightly expanded and contracted in the 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). In this embodiment, the V-ribbed belt 5 has a belt circumference shorter than the layout circumference between the auxiliary pulley 3, the crank pulley 4, and the back pulley 22, so that strong tension is applied to the V-ribbed belt 5. ing.

Further, on the inner circumferential surface (back surface) of the V-ribbed belt 5, a pulley groove 21a formed on the outer circumferential surface of the front pulley 21 of the two-stage pulley 2 and a pulley groove formed on the outer circumferential surface of the back pulley 22 are provided. A plurality of ribs that can be fitted to 22a are formed in the circumferential direction.

Note that the thick arrow V in FIG. 5 indicates the running direction of the V-ribbed belt 5, and the rotation direction of the two-stage pulley 2 when the V-ribbed belt 5 runs in this running direction is defined as the rotation direction A.

(Belt mounting jig 9)
Next, the configuration of the belt attachment jig 9 according to this embodiment will be explained with reference to FIGS. 2 and 3.

As shown in FIGS. 2 and 3, the belt mounting jig 9 includes a main body part 91 having an arc shape along the outer peripheral surface of the front pulley 21 (the surface of the pulley groove 21a), and a main body part 91 provided in front of the main body part 91. With the belt scoop receiving surface 92, the belt support part 93 provided on the outer circumferential surface 91a of the main body part 91, and the main body part 91 along the outer circumferential surface of the front pulley 21, the front pulley 21 and the back pulley 22 are connected to each other. A belt guide part 94 is provided at a position straddling the pulley flange 2b provided between the belt support part 93 and the belt guide part 94, which is inclined from the belt support part 93 toward the outer peripheral surface of the back pulley 22 (the surface of the pulley groove 22a), and the main body part. A front pulley support section 95 provided at the rear of the pulley 91 and a back pulley support section extending from the side surface of the main body section 91 toward the back pulley 22 side with the main body section 91 along the outer peripheral surface of the front pulley 21. 96.

The main body portion 91 (including the belt scoop receiving surface 92 and the front pulley support portion 95) has a curved shape along the outer peripheral surface of the front pulley 21. A rib portion 97 (second locking portion) that fits into a pulley groove 21a formed on the outer peripheral surface of the front pulley 21 is formed on the inner peripheral surface side of the main body portion 91 and the belt scoop receiving surface 92.

In this embodiment, as shown in FIG. 2(a), the outer circumferential surface 91a of the main body part 91 has an arc shape along the outer circumferential surface of the front pulley 21, but it may have a planar shape. good.

As shown in FIG. 2B, the rib portion 97 includes six convex ribs extending along the inner circumferential surface of the main body portion 91 and the inner circumferential surface of the belt scoop receiving surface 92 in the longitudinal direction. When the belt attachment jig 9 is attached to the two-stage pulley 2, the rib portion 97 fits into the pulley groove 21a of the front pulley 21, so that the belt attachment jig 9 can be accurately attached to the outer periphery of the front pulley 21. Can be fixed. In addition, in this embodiment, the rib portion 97 is configured by six ribs in accordance with the number of pulley grooves 21a of the front pulley 21, but in order to configure the rib portion 97, at least one convex rib is required. Therefore, the rib portion 97 may be formed of a smaller number of ribs than the number of pulley grooves 21a formed in the front pulley 21.

The belt scoop receiving surface 92 has a tapered shape toward the front, as shown in FIGS. 2 and 3. That is, when the two-stage pulley 2 is rotated in the rotation direction A with the main body portion 91 along the outer circumferential surface of the front pulley 21, the belt scoop receiving surface 92 contacts the outer circumferential surface of the front pulley 21. The thickness becomes thinner toward the direction in which it enters between the back surface of the V-ribbed belt 5 wound around the pulley 21. Note that the taper angle of the belt scoop receiving surface 92 is determined by the size of the two-stage pulley 2, the tension of the V-ribbed belt 5, the outer diameter size of the back pulley 22, and is not particularly limited.

As shown in FIGS. 2 and 3, the belt support section 93 has a rectangular parallelepiped shape, and is in line contact with the back surface of the V-ribbed belt 5 introduced from the belt scoop receiving surface 92 in front of the belt support section 93. A belt support line 93a is formed in the width direction. That is, the belt support line 93a is formed parallel to the central axis direction of the two-stage pulley 2. Note that the belt support line 93a does not necessarily have to be parallel to the central axis direction of the two-stage pulley 2, and may be inclined.

Here, the belt support line 93a of the belt support portion 93 is connected to the outer circumferential surface of the back pulley 22 and the pulley flange 2b on the outer circumferential surface of the main body portion 91 with the main body portion 91 along the outer circumferential surface of the front pulley 21. It is formed at a height slightly outside (radially outside of the front pulley 21).

In this embodiment, the upper surface 93b of the belt support portion 93 has a planar shape as shown in FIG. good.

The belt guide part 94 extends from the side of the belt support part 93 to the back pulley 22 side so as to straddle the pulley flange 2b, with the main body part 91 along the outer peripheral surface of the front pulley 21. It extends to the center in the width direction. Further, as shown in FIG. 3, when the belt mounting jig 9 is viewed from the front, the upper surface 94b of the belt guide section 94 extends from the belt support section 93 (belt support line 93a) to the outer circumferential surface of the back pulley 22 (the pulley groove 22a). surface). Further, when viewed from above of the belt mounting jig 9, the belt guide portion 94 has a trapezoidal shape, and is sloped to become wider from the front to the rear of the belt guide portion 94. A belt guide line 94a (an inclined portion that becomes wider from the front to the rear of the belt guide part 94) is formed in front of the belt guide part 94, and makes line contact with the back surface of the V-ribbed belt 5 that is slid from the belt support line 93a. There is.

In addition, in this embodiment, as shown in FIG. 2(a), the upper surface 94b of the belt guide portion 94 has a planar shape, but it may have an arcuate shape along the front-rear direction.

Furthermore, a rib portion 98 (first locking portion) that fits into a pulley groove 22a formed on the outer peripheral surface of the back pulley 22 is formed on the inner peripheral surface side of the belt guide portion 94. As shown in FIG. 2(b), the rib portion 98 is constituted by two convex ribs extending along the inner peripheral surface of the belt guide portion 94 in the longitudinal direction. When the belt attachment jig 9 is attached to the double pulley 2, the rib portion 98 fits into the pulley groove 22a of the back pulley 22, so that the belt attachment jig 9 is attached to the outer periphery of the back pulley 22. Can be fixed accurately. In addition, when forming the rib part 98 on the inner peripheral surface of the belt guide part 94, it is sufficient if there is at least one convex rib.

Since the rib portion 98 is composed of two convex ribs, it can fit into any one of the plurality of grooves of the pulley groove 22a formed on the outer peripheral surface of the back pulley 22. . Therefore, the belt attachment jig 9 can be commonly used for the back pulleys 22 having pulley grooves 22a of various sizes (widths), shapes, and numbers of grooves.

The front pulley support section 95 is provided at the rear of the main body section 91 and has a curved shape along the outer peripheral surface of the front pulley 21. No rib portion is provided on the inner circumferential surface of the front pulley support portion 95. The thickness of the front pulley support portion 95 is preferably thinner than the maximum thickness B of the belt scoop receiving surface 92 (see FIG. 2(c)). When the belt attachment jig 9 is attached to the double pulley 2, the inner peripheral surface of the front pulley support part 95 comes into contact with the outer peripheral surface of the front pulley 21, so that the belt attachment jig 9 is attached to the front pulley 21. It can be stably fixed on the outer periphery.

The back pulley support part 96 extends from the side surface of the main body part 91 and the belt scoop receiving surface 92 to the back pulley 22 side so as to straddle the pulley flange 2b, with the main body part 91 along the outer peripheral surface of the front pulley 21. It is overhanging. A groove portion 96a (see FIG. 2(b)) is formed on the inner peripheral surface of the back pulley support portion 96 to avoid contact between the pulley flange 2b and the back pulley support portion 96. The groove width of the groove portion 96a is made wider than the width of the pulley flange 2b.

Further, the back pulley support section 96 is provided with a belt adjustment section 96b that projects from the side surface of the belt scoop receiving surface 92 toward the back pulley 22 side. This belt adjustment part 96b is positioned on the outer circumferential surface of the back pulley 22 on the back pulley 22 side from the belt scoop receiving surface 92, with the main body 91 aligned along the outer circumferential surface of the front pulley 21. It is provided. The belt adjustment section 96b adjusts the V-ribbed belt 5 that is slid from the belt scoop receiving surface 92 when the V-ribbed belt 5 wound around the front pulley 21 is shifted to the back pulley 22 using the belt mounting jig 9. comes into contact with the back side of the Further, as shown in FIGS. 3 and 12, the belt adjustment section 96b projects further toward the back pulley 22 than the belt guide section 94. As shown in FIGS.

(How to use belt mounting jig 9)
Next, a method of using the belt attachment jig 9 described above will be explained with reference to FIGS. 5 to 12. Specifically, first, we will explain the procedure (a) for winding the V-ribbed belt 5 between the auxiliary pulley 3, the crank pulley 4, and the front pulley 21 of the two-stage pulley 2, and then winding it around the front pulley 21. The procedure (b) for shifting the hung V-ribbed belt 5 to the back pulley 22 using the belt attachment jig 9 will be described.

Although not shown, a wrench is connected to the boss portion 6 of the two-stage pulley 2 so that the two-stage pulley 2 can be freely rotated manually.

(Step (a))
First, as shown in FIG. 5, the operator wraps the V-ribbed belt 5 between the auxiliary pulley 3, the crank pulley 4, and the front pulley 21. At this time, the layout circumference between the auxiliary machine pulley 3, crank pulley 4, and front pulley 21 is shorter than the layout circumference between the auxiliary machine pulley 3, crank pulley 4, and back pulley 22, so the work A person can wind the V-ribbed belt 5 between the accessory pulley 3, the crank pulley 4, and the front pulley 21 relatively easily.

In addition, in this embodiment, the case where the V-ribbed belt 5 is wound by hand between the auxiliary machine pulley 3, the crank pulley 4, and the front pulley 21 is described, but the invention is not limited to this. When winding the V-ribbed belt 5 between the pulley 3, crank pulley 4, and front pulley 21, it is possible to use a belt mounting jig that is commonly used for winding the V-ribbed belt 5 between single-stage pulleys. (For example, the belt mounting jig disclosed in Japanese Patent Application Laid-Open No. 2011-208753).

(Step (b))
Next, according to the above procedure (a), the V-ribbed belt 5 wound around between the auxiliary pulley 3, the crank pulley 4, and the front pulley 21 is moved from the front pulley 21 to the rear using the belt installation jig 9. The procedure for shifting to the side pulley 22 will be explained.

First, the belt mounting jig 9 is installed so that the main body portion 91 follows the outer peripheral surface of the front pulley 21 (see FIG. 4). At that time, since a rib portion 97 is provided on the inner circumferential surface side of the main body portion 91 and a rib portion 98 is provided on the inner circumferential surface side of the belt guide portion 94, the belt mounting jig is 9 can be reliably installed on the outer circumferential surface of the front pulley 21 and the outer circumferential surface of the back pulley 22.

Next, the two-stage pulley 2 is rotated in the rotation direction A using a wrench. At this time, as shown in FIG. 5, the belt scoop receiving surface 92 of the belt mounting jig 9 is inserted between the front pulley 21 and the V-ribbed belt 5. Further, when the two-stage pulley 2 rotates in the rotation direction A, the V-ribbed belt 5 is lifted. At this time, the V-ribbed belt 5 is strongly pressed against the belt scooping receiving surface 92 due to the reaction of the V-ribbed belt 5 being lifted, so that the belt mounting jig 9 is brought into close contact with the front pulley 21. Thereby, the belt attachment jig 9 can be prevented from coming off or shifting from the front pulley 21.

In addition, the belt scoop receiving surface 92 is located between the outer peripheral surface of the front pulley 21 and the back surface of the V-ribbed belt 5 wound around the front pulley 21, with the main body portion 91 along the outer peripheral surface of the front pulley 21. Since it has a tapered shape in the direction of insertion, the belt scoop receiving surface 92 can be smoothly inserted between the outer peripheral surface of the front pulley 21 and the back surface of the V-ribbed belt 5, and the V-ribbed belt can be inserted without applying excessive load. The ribbed belt 5 can be lifted.

Further, when the two-stage pulley 2 is rotated in the rotation direction A, the back surface of the V-ribbed belt 5 comes into contact with the belt support line 93a of the belt support part 93 next to the belt scoop receiving surface 92, as shown in FIG. come into contact with As a result, the belt support line 93a of the belt support part 93 comes into line contact with the back surface of the V-ribbed belt 5 lifted by the belt scoop receiving surface 92, and the V-ribbed belt 5 is moved from the outer peripheral surface of the back pulley 22 and the pulley flange 2b. can also be supported at a height position on the outside (radially outside of the front pulley 21). At this time, since the V-ribbed belt 5 and the belt support portion 93 are in line contact, it is possible to avoid applying excessive tension to the V-ribbed belt 5.

Furthermore, when the two-stage pulley 2 is rotated in the rotation direction A, the back surface of the V-ribbed belt 5 comes into contact with the belt guide line 94a of the belt guide section 94 next to the belt support line 93a, as shown in FIG. . Here, the belt guide line 94a of the belt guide portion 94 is inclined from the belt support line 93a toward the outer circumferential surface of the back pulley 22 at a position where it straddles the front pulley 21 and the back pulley 22. Since the V-ribbed belt 5 supported by the belt support line 93a is subjected to a contraction force in the circumferential direction of the belt, as soon as the back side of the V-ribbed belt 5 comes into contact with the belt guide line 94a, as shown in FIG. The V-ribbed belt 5 begins to slide toward the back pulley 22 while making line contact with the inclined belt guide line 94a.

Furthermore, when the two-stage pulley 2 is rotated in the rotation direction A, the back surface of the V-ribbed belt 5 comes into contact with the belt guide line 94a over the entire width, as shown in FIG. At this time, the V-ribbed belt 5 that has moved to the rear side of the belt guide section 94 is guided by the outer peripheral surface of the back pulley 22. As described above, since the belt guide portion 94 is inclined toward the outer circumferential surface of the back pulley 22, the V-ribbed belt 5 can be reliably wrapped around the outer circumferential surface of the back pulley 22. In addition, since the belt guide wire 94a of the belt guide portion 94 comes into line contact with the back surface of the V-ribbed belt 5, the V-ribbed belt 5 can be smoothly attached while sliding from the belt support portion 93 to the back pulley 22 in the shortest route. Therefore, the V-ribbed belt 5 can be attached without applying excessive tension and without causing permanent deformation.

Further, the two-stage pulley 2 is rotated in the rotation direction A. Then, as shown in FIG. 9, the V-ribbed belt 5 on the outer peripheral surface of the front pulley 21 moves away from the outer peripheral surface of the front pulley 21 and toward the outer peripheral surface of the rear pulley 22.

At this time, as shown in FIG. 12, since the belt adjustment part 96b of the back pulley support part 96 protrudes from the side surface of the belt scoop receiving surface 92 toward the back pulley 22 side than the belt guide part 94, Since the back surface of the V-ribbed belt 5 slides from the belt scoop receiving surface 92 in contact with the belt adjustment part 96b, the V-ribbed belt 5 can be smoothly shifted to the outer peripheral surface of the back pulley 22. When using the belt mounting jig 9 to shift the V-ribbed belt 5 from the front pulley 21 to the back pulley 22, the step immediately before the shifting operation of the V-ribbed belt 5 to the outer peripheral surface of the back pulley 22 is completed. Then, the V-ribbed belt 5 slides forcefully onto the outer peripheral surface of the back pulley 22. At this time, the V-ribbed belt 5 tends to exhibit a behavior of greatly dropping onto the outer peripheral surface of the back pulley 22. This behavior causes the V-ribbed belt 5 to twist or overturn. Therefore, by providing the belt adjustment part 96b in the belt mounting jig 9, as shown in FIG. It plays a supporting role over a wide range of areas. Thereby, it is possible to prevent the V-ribbed belt 5 from twisting or rolling over immediately before the shift operation of the V-ribbed belt 5 from the front pulley 21 to the rear pulley 22 is completed.

As a result of the above, as shown in FIG. 10, the V-ribbed belt 5 wrapped around the front pulley 21 can be completely shifted to the back pulley 22. At this time, the pressure on the belt scoop receiving surface 92 of the V-ribbed belt 5 is naturally released, so that the belt mounting jig 9 can be recovered from the two-stage pulley 2.

If the belt mounting jig 9 is used according to the above procedure, the V-ribbed belt 5, which is wound between the auxiliary equipment pulley 3, the crank pulley 4, and the front pulley 21 of the two-stage pulley 2, can be moved from the front pulley 21 to the rear side. It is possible to facilitate the work of shifting the pulley 22, and to minimize the pushing up force from the belt attachment jig 9 side against the back surface of the V-ribbed belt 5 when shifting.

(Other embodiments/modifications, etc.)
As shown in FIG. 13, in the belt attachment jig 109, the inner circumferential surface of the main body portion 191 and the inner circumferential surface of the front pulley support portion 195 may be subjected to a lightening process. Thereby, the weight of the belt attachment jig 109 can be reduced. Further, as shown in FIG. 13, two holes 195a for passing a string or the like may be provided in the hollowed-out area of the front pulley support portion 195. By passing a string through these two holes 195a and tying the passed string to a wrench, etc., the belt mounting jig 109 is prevented from falling from the wrench during the work of winding the V-ribbed belt 5 around the two-stage pulley 2. can do.

Further, in the above embodiment, as shown in FIG. 3, the belt guide part 94 has a trapezoidal shape when viewed from the top of the belt mounting jig 9, and the belt guide part 94 has a slope that becomes wider from the front to the rear of the belt guide part 94. A guide line 94a) is attached. However, the present invention is not limited to this, and as shown in FIG. 14, the belt guide section 294 has a trapezoidal shape when viewed from above of the belt mounting jig 209, and has a slope that becomes wider from the rear to the front of the belt guide section 294. It may have a different shape. Further, as shown in FIG. 15, when viewed from above of the belt mounting jig 309, the belt guide portion 394 has a trapezoidal shape, and the slope becomes wider from the front to the rear of the belt guide portion 394 (belt guide line 394a portion). , and may have an inclined shape that becomes wider from the rear to the front of the belt guide portion 394.

Further, the belt mounting jig 9 of the above embodiment is used to wrap the V-ribbed belt 5 around the two-stage pulley 2, but when multiple pulleys such as a three-stage pulley are arranged in parallel in the central axis direction, It can also be used for multi-stage pulleys.

In addition, the height A of the belt support portion 93 (see FIG. 2(c)) is set to the outside of the outer peripheral surface of the back pulley 22 and the pulley flange 2b when the belt mounting jig 9 is installed on the double pulley 2. It should be at a height of . Therefore, the lower the height A of the belt support part 93, the lower the height of the belt support line 93a, so that the V-ribbed belt 5 is not lifted up excessively, and the belt support line 94a of the belt guide line 94a is lowered. Since the angle of inclination from the portion 93 (belt support line 93a) toward the outer circumferential surface of the back pulley 22 (the surface of the pulley groove 22a) is also gentle, the twisted posture of the V-ribbed belt 5 during shifting can be suppressed. .

Further, in the above embodiment, the rib portion 97 is formed on the inner circumferential surface side of the main body portion 91 and the belt scoop receiving surface 92, but the rib portion 97 may not be formed. Further, in the above embodiment, the rib portion 98 is formed on the inner peripheral surface side of the belt guide portion 94, but the rib portion 98 may not be formed.

Further, in the belt attachment jig 9 of the above embodiment, the front pulley support part 95 is provided at the rear of the main body part 91, but it may not be provided.

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 3-axis layout 2 Double pulley 21 Front pulley 21a Pulley groove 22 Back pulley 22a Pulley groove 3 Auxiliary pulley 4 Crank pulley 5 V-ribbed belt 6 Boss part 9 Belt mounting jig 91 Main body part 92 Belt scoop receiving surface 93 Belt Support part 93a Belt support line 94 Belt guide part 94a Belt guide line 95 Front pulley support part 96 Back pulley support part 96b Belt adjustment part 97 Rib part 98 Rib part A Rotation direction

Claims (5)

When winding a belt that is stretchable in the circumferential direction between a multi-stage pulley in which a plurality of pulleys including at least a front pulley and a back pulley are arranged in parallel in the direction of the central axis of the pulley and the base pulley, A belt mounting jig used for shifting the belt wound between the base pulley and the front pulley from the front pulley to the back pulley,
a main body portion having a shape that follows the outer peripheral surface of the front pulley;
a belt scoop receiving surface provided on the main body portion and inserted between the outer circumferential surface of the front pulley and the back surface of the belt wound around the front pulley;
With the main body section along the outer circumferential surface of the front pulley, the main body section is provided at a height position outside of the outer circumferential surface of the back pulley, and is introduced from the belt scoop receiving surface. a belt support part that makes line contact with the back side of the belt;
The main body portion is provided along the outer peripheral surface of the front pulley at a position straddling the front pulley and the rear pulley so as to be inclined from the belt support portion toward the outer peripheral surface of the rear pulley. A belt mounting jig comprising: a belt guide section that is in line contact with the back surface of the belt that is slid from the belt support section. The belt scoop receiving surface is
With the main body section aligned along the outer peripheral surface of the front pulley, it has a tapered shape in the direction of entering between the outer peripheral surface of the front pulley and the back surface of the belt wound around the front pulley. The belt mounting jig according to claim 1, characterized in that: The belt guide section is characterized in that a first locking section is provided on the inner circumferential surface side to lock the outer circumferential surface of the back pulley and the inner circumferential surface of the belt guide section. The belt mounting jig according to item 1 or 2. The main body portion is provided with a second locking portion on the inner circumferential surface side that locks the outer circumferential surface of the front pulley and the inner circumferential surface of the main body portion. 3. The belt mounting jig according to any one of 3. With the main body section along the outer circumferential surface of the front pulley, the belt slider is slid from the belt scoop receiving surface onto the outer circumferential surface of the back pulley, which is closer to the back pulley than the belt scoop receiving surface. A belt adjusting section is provided that comes into contact with the back side of the belt.
The belt mounting jig according to any one of claims 1 to 4, wherein the belt adjustment part projects further toward the back pulley than the belt guide part.

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