JP5009885B2 - Belt mounting jig - Google Patents

Description

  The present invention relates to a belt attachment jig for attaching a belt that can be extended in the circumferential direction to the pulley groove while rotating a pulley having a pulley groove on an outer peripheral surface.

  Generally, a belt transmission mechanism in which a belt is wound around a pulley having a pulley groove on the outer peripheral surface is provided with tension adjusting means such as a tension pulley so that a predetermined belt tension is applied after the belt is attached to the pulley. It has been.

  In order to eliminate the need for such tension adjusting means, a belt has appeared that is extended in the circumferential direction so as to get over the pulley flange when attached to the pulley. Further, Patent Document 1 discloses that the belt extends in the circumferential direction. A belt mounting jig is disclosed for extending over a pulley flange while being extended and fitting into a pulley groove.

FIG. 5 shows a belt mounting jig disclosed in Patent Document 1. The belt attaching jig 101 is used by being attached to the pulley 102. The belt 104 is fitted in the pulley groove 103 at the rear of the pulley rotating direction than the belt attaching jig 101, and the belt 104 is hung on the holding surface 105. To hold. Further, by attaching a tool to the center bolt 106 of the pulley 102 and rotating it, the belt mounting jig 101 is advanced forward in the pulley rotation direction, and the range of the belt 104 that fits in the pulley groove 103 is gradually widened. 104 is attached to the pulley 102.
JP 2006-300192 A (paragraph numbers 0028, 0035, 0036, 0043, 0044, FIG. 6)

  However, for example, when the belt tension is set high, the belt's circumference in the free state is shortened as much as the belt's elongation rate is increased. I can't hang a belt on it. In this case, when the pulley on which the belt attaching jig is mounted is rotated, the belt is liable to slip, and the belt may not be attached while the pulley is rotated.

  An object of this invention is to provide the belt attachment jig which can attach a belt, rotating a pulley, even when a belt cannot be hung on the sufficient range of a pulley.

  In order to achieve the above object, a belt attachment jig according to the present invention is for attaching a belt that can be extended in the circumferential direction to a pulley groove while rotating a pulley having a pulley groove on an outer peripheral surface, The fixing means for fixing the belt mounting jig to the pulley until the belt fits into the pulley groove, and the outer surface of the pulley flange receiving a part of the belt until the belt slides in the pulley axial direction and fits into the pulley groove. A holding surface that holds the outer side in the radial direction and the outer side in the pulley axial direction, and the holding surface is formed with a slip stopper that prevents the belt from slipping in the pulley rotation direction.

  According to the above configuration, the holding surface that receives a strong force from the belt forms a non-slip, so that the belt can be prevented from slipping in the pulley rotation direction even when the belt cannot be hung over a sufficient range of the pulley. The belt can be attached while rotating the pulley.

  Here, the holding surface is a surface located outside the pulley flange in the pulley axial direction and a surface in a range located radially outside the outer peripheral surface of the pulley flange. With this holding surface as the boundary, the belt is fitted in the pulley groove at the rear in the pulley rotation direction, and the belt is passed outside the pulley in the axial direction at the front in the pulley rotation direction. Can be hung on a jig. Further, when the pulley is rotated, the belt mounting jig also rotates in the circumferential direction following the rotation of the pulley, so that the belt passing through the outside in the axial direction of the pulley in front of the belt rotation direction than the belt mounting jig is outside the radial direction. When it moves in the direction and reaches the outer side in the radial direction from the outer peripheral surface of the pulley flange, it slides over the pulley flange and fits into the pulley groove.

  If an inclined surface that slides the belt into the pulley groove is formed continuously with the holding surface, the belt can easily move from the holding surface to the pulley groove, and the belt can be attached more smoothly. In addition, the inclined surface smoothly transitions from a portion of the belt held by the holding surface to a portion fitted in the pulley groove, and also functions as a stopper for the portion fitted in the pulley groove. Furthermore, when the belt is mounted while rotating the pulley, slippage in the pulley rotation direction of the belt can be more reliably prevented by forming a slip stopper that prevents the belt from slipping in the pulley rotation direction on the inclined surface. .

  Examples of the fixing means include a structure including a mounting hole that is externally fitted to the boss portion of the pulley, and a protruding piece that protrudes so as to fit into the pulley groove across the pulley flange from the holding surface. This structure restricts the movement of the mounting hole in the direction perpendicular to the pulley axis, and the protruding piece prevents it from slipping out in the direction of the pulley axis. can do. Furthermore, when the belt is mounted while rotating the pulley, slippage in the pulley rotation direction of the belt can be more reliably prevented by forming a slip stopper on the protruding piece to prevent the belt from slipping in the pulley rotation direction. .

  Furthermore, if the mounting hole is a long hole that allows the protruding piece to move over the pulley flange and fit into the pulley groove, the protruding piece can be easily fitted into the pulley groove when the belt mounting jig is mounted. This makes it possible to more easily attach the belt mounting jig. Moreover, after the belt is hung on the holding surface, the belt mounting jig is prevented from moving in the longitudinal direction by being pressed by the belt, so that the belt mounting jig can be prevented from falling off. . It should be noted that other structures such as nut fastening to the center bolt of the pulley can be employed as the fixing means.

  As the friction coefficient of the anti-slip, the friction coefficient with respect to the slip of the belt in the pulley axial direction can be set smaller than the friction coefficient with respect to the slip of the belt in the pulley rotation direction. According to this configuration, the belt hung on the belt mounting jig can be smoothly slid in the pulley axis direction and fitted in the pulley groove while preventing the belt from slipping in the pulley rotation direction.

  Examples of the anti-slip include those formed by grooving and those formed by embossing. In particular, the anti-slip formed by groove processing sets the groove direction to the pulley axis direction, so that the friction coefficient for slippage in the pulley axis direction of the belt is set smaller than the friction coefficient for slippage in the pulley rotation direction of the belt. can do.

  By adopting the belt mounting jig with the above configuration, the belt can be prevented from slipping in the pulley rotation direction, so that the belt mounting jig is attached to one of the plurality of pulleys and the belt is wound around By rotating the pulley, it is possible to attach the belt while rotating one pulley through the belt.

  Thus, for example, even if a belt attachment jig is attached to the pulley on the small diameter side or the low load side, the belt can be attached by rotating the pulley on the large diameter side or the high load side with a tool, etc. Thus, the force required to directly rotate the pulley can be reduced or stabilized. In particular, when the other pulley is a two-stage pulley, the belt mounting jig cannot be mounted, and therefore the configuration of the present invention is preferably employed.

  As described above, according to the present invention, since the slip stopper is formed on at least the holding surface of the belt mounting jig, it is possible to prevent the belt from slipping in the pulley rotation direction when the belt is attached to the pulley. As a result, even when the belt cannot be applied to a sufficient range of the pulley, for example, when the perimeter of the belt in a free state is shortened and the mounting tension is set high, the belt is rotated while the pulley is rotated. Can be attached.

  Hereinafter, the best mode for carrying out the belt mounting jig according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a belt attachment jig according to the present invention, FIG. 2 is a front view of the belt attachment jig attached to a pulley, and FIG.

  The belt mounting jig 1 is used by being mounted on the outer side in the pulley axial direction of one pulley 2 of the pair of pulleys 2 and 3, for example, and the belt 4 is attached to the belt mounting jig 1 and the other pulley 3. And the other pulley 3 is rotated to attach the belt 4 to the pulley groove 5 formed on the outer peripheral surface of the pulley 2 while rotating the one pulley 2 via the belt 4 and the belt attaching jig 1. It is like that.

  The belt mounting jig 1 is a substantially elliptical thick plate, and its longitudinal direction is the radial direction of the pulley 2 so that one end is positioned near the rotation center of the pulley 2 and the other end is positioned near the pulley flange 6. It is attached according to. The thickness of the belt mounting jig 1 is set to a size that allows the belt 4 to be hung on the peripheral surface, and a holding surface 7 that receives and holds a part of the belt 4 on the peripheral surface of the belt mounting jig 1. A guide surface 8 that guides the belt 4 to the holding surface 7 is formed, and a slip stopper 20 that prevents the belt 4 from slipping in the pulley rotation direction is formed on the holding surface 7.

  The holding surface 7 is a range of the peripheral surface of the belt mounting jig 1 that is positioned radially outward from the outer peripheral surface of the pulley flange 6, and the belt 4 that is stretched as the pulley 2 rotates rotates the pulley flange 6. Until the belt slips in the pulley axial direction so as to fit over the pulley groove 5, a part of the belt 4 is held radially outward and pulley axially outer than the outer peripheral surface of the pulley flange 6. Continuing from the holding surface 7, a protruding piece 9 that protrudes so as to fit into the pulley groove 5 across the pulley flange 6 is formed, and the inclined surface 10 formed at the base end portion of the protruding piece 9 causes the belt 4. Is slid into the pulley groove 5.

  The anti-slip 20 is formed by groove processing for forming a plurality of grooves on the holding surface 7 of the belt mounting jig 1, and the anti-slip 20 is also formed in a range reaching the protruding piece 9 and the inclined surface 10. ing. The direction of the groove of the anti-slip 20 is set in the plate thickness direction of the belt mounting jig 1, that is, the pulley axis direction, and the friction coefficient with respect to the slip of the belt 4 in the pulley axis direction is the friction coefficient with respect to the slip of the belt 4 in the pulley rotation direction. Is set smaller than. Thereby, the slip of the belt 4 in the pulley rotation direction is prevented without inhibiting the slip of the belt 4 in the pulley axis direction.

  The guide surface 8 is formed in a curved shape that is continuous with the holding surface 7 and swells forward in the rotational direction of the pulley 2, and holds the belt 4 passing through the front in the rotational direction of the pulley 2 outside the pulley flange 6 in the pulley axial direction. To guide. The guide surface 8 bulges into a curved surface so that it protrudes forward in the rotational direction of the pulley 2 from the straight line connecting the rotational center of the pulley 2 and the front end of the holding surface 7 in the rotational direction, and directs the belt 4 to be guided in the rotational direction. Thus, the pulley 2 is rotated by the tension of the belt 4.

  Near one end of the belt mounting jig 1, a mounting hole 12 is formed to be fitted around a boss portion 11 formed at the center of the pulley 2. The mounting hole 12 and the holding surface 7 are formed continuously. The protruding piece 9 constitutes fixing means for fixing the belt mounting jig 1 to the pulley 2. The fixing means regulates the movement of the belt mounting jig 1 in the direction perpendicular to the pulley axis at the mounting hole 12 and also moves in the pulley axial direction of the belt mounting jig 1 with the protruding piece 9 fitted in the pulley groove 5. Regulate the movement of

  The mounting hole 12 is a long hole that allows movement when the protruding piece 9 gets over the pulley flange 6 and fits into the pulley groove 5 when the belt mounting jig 1 is mounted. The movement of the belt attachment jig 1 in the major axis direction of the attachment hole 12 is restricted by the belt attachment jig 1 being pressed by the belt 4 after being attached to the pulley 2 and hanging the belt 4. Accordingly, the belt mounting jig 1 is prevented from falling off due to the protruding piece 9 being detached from the pulley groove 5, and the belt mounting jig 1 is fixed to the pulley 2 until the belt 4 fits into the pulley groove 5.

  The pulleys 2 and 3 are rotatably supported by inserting a pulley shaft through the boss portion 11, and a plurality of grooves are formed in the pulley groove 5 on the outer peripheral surface so as to wrap around a V-ribbed belt, for example. Of the pulleys 2 and 3, the pulley 3 is a pulley having a larger diameter or a higher load than the pulley 2, and the belt mounting jig 1 is attached like a small-diameter and rear-side pulley of a two-stage pulley. It is a pulley that cannot be attached.

  The belt 4 can be extended in the circumferential direction so that tension adjusting means such as a tensioner is not required. For example, the belt 4 has a structure in which a core wire made of polyamide is embedded in the belt main body. Is set to 2-3%. In addition, although the V ribbed belt is illustrated as the belt 4, belts other than V ribbed belts, such as a flat belt, may be sufficient.

  Next, a procedure for attaching the belt 4 to the pair of pulleys 2 and 3 using the belt attaching jig 1 will be described. FIG. 4 is a diagram showing a procedure for attaching a belt to a pair of pulleys using a belt attaching jig.

  First, as shown in FIG. 4A, the belt attachment jig 1 is attached to the pulley 2 on the small diameter side, the pulley 2 is appropriately rotated, and the belt attachment jig 1 is rotated around the center of rotation of the pulleys 2 and 3. Position behind the connecting line in the rotational direction. Here, when the belt attachment jig 1 is attached to the pulley 2, the belt attachment jig 1 is moved in the major axis direction of the attachment hole 12 while the attachment hole 12 is externally fitted to the boss portion 11 of the pulley 2. The protruding piece 9 gets over the pulley flange 6 and is fixed in the pulley groove 5.

  Further, the belt 4 is wound around the pulley 3 on the large diameter side, and the belt 4 is fitted in the pulley groove 5 in the pulley rotation direction rearward of the belt mounting jig 1 in the pulley 2. Further, in the vicinity of the belt attaching jig 1, the belt 4 is bent in the belt width direction and straddles the pulley flange 6 along the inclined surface 10 of the protruding piece 9. The belt 4 is hung on the holding surface 7 and the guide surface 8 of the belt mounting jig 1, and the belt 4 is passed forward of the pulley mounting direction in front of the belt mounting jig 1 and outward in the pulley axial direction of the pulley 2. In this state, no tension is applied to the belt 4, and the belt 4 can be easily hung on the belt mounting jig 1 and the pulleys 2 and 3.

  Next, as shown in FIGS. 4B and 4C, for example, a commercially available tool 14 is attached to the center bolt 13 of the pulley 3 on the large diameter side and the pulley 3 is rotated to thereby rotate the belt 4 and the belt mounting jig. The pulley 2 is rotated through the tool 1. At this time, the belt 4 is prevented from slipping in the pulley rotation direction by the anti-slip 20 and is guided in the rotation direction of the pulley 2 by the guide surface 8, so that the pulley 2 can be rotated by the tension of the belt 4. it can. Further, since the pulley 3 on the large diameter side is rotated as the driving side and the pulley 2 on the small diameter side is rotated as the driven side, the force required for the rotation can be reduced.

  As a result, while the belt 4 is extended, the belt mounting jig 1 advances forward in the pulley rotation direction, and the range in which the belt 4 fits in the pulley groove 5 is expanded. At this time, the belt reaction force acts on the holding surface 7 to hold the belt mounting jig 1, so that the movement of the mounting hole 12 in the major axis direction is prevented and at least the belt 4 is fitted into the pulley groove 5. The mounting jig 1 is prevented from falling off, and the belt can be attached with one hand.

  Since the belt 4 is fitted in the pulley groove 5 behind the belt mounting jig 1 in the pulley rotation direction and the movement in the pulley axial direction is restricted, the restoring force of the belt 4 bent in the belt width direction is forward in the pulley rotation direction. Thus, a force for moving the belt 4 toward the pulley groove 5 acts. The restoring force of the belt 4 is a thrust force as a component of belt tension or an elastic force of the belt 4.

  The belt 4 moves radially outward from the vicinity of the center of the pulley 2 in front of the belt mounting jig 1 in the pulley rotation direction, and gradually approaches the outer edge of the pulley flange 6. Eventually, due to the restoring force of the belt 4, the belt 4 rides over the pulley flange 6, and the inclined surface 10 and the protruding piece 9 slide from the holding surface 7 to fit into the pulley groove 5. At this time, since the friction coefficient with respect to the slip of the belt 4 in the pulley axis direction of the belt 4 is set to be small, the slip of the belt 4 in the pulley axis direction is not hindered by the anti-slip 20. As a result, the belt 4 is completely attached to the pulley 2 as shown in FIG.

  Since the reaction force of the belt 4 does not act on the holding surface 7 after the belt 4 is completely attached to the pulley 2, the belt attachment jig 1 can be moved again in the major axis direction of the attachment hole 12. Thereby, the protrusion piece 9 can be removed from the pulley groove | channel 5, and the belt attachment jig | tool 1 can be removed easily.

  In addition, this invention is not limited to said embodiment, A change can be suitably added within the scope of the present invention. For example, the non-slip 20 may be not only a groove-processed one but also a texture-processed one for forming a rough surface or a plurality of ridges.

  Moreover, the guide surface 8 does not necessarily need to be formed in a curved shape that swells forward in the rotational direction. That is, the belt 4 can be applied with a strong tension by the amount of blocking of the belt 4 in the pulley rotation direction by the anti-slip 20, so that the other pulley 3 is rotated even when the guide surface 8 is not inflated. Thus, one pulley 2 can be rotated via the belt 4 and the belt mounting jig 1.

The perspective view of the belt attachment jig which concerns on this invention Front view of the belt mounting jig attached to the pulley AA sectional view of FIG. The figure which shows the procedure of attaching a belt to a pair of pulleys using a belt attachment jig A perspective view showing a conventional belt mounting jig

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Belt attachment jig 2, 3 Pulley 4 Belt 5 Pulley groove 6 Pulley flange 7 Holding surface 8 Guide surface 9 Protruding piece 10 Inclined surface 11 Boss part 12 Mounting hole 13 Center bolt 14 Tool 20 Non-slip

Claims (8)

A belt attachment jig for attaching a belt that can be extended in the circumferential direction to the pulley groove while rotating a pulley having a pulley groove on the outer peripheral surface,
At least until the belt fits into the pulley groove, a fixing means for fixing the belt mounting jig to the pulley and a part of the belt until the belt slides in the pulley axial direction and fits into the pulley groove. A holding surface that holds the outer circumferential surface of the pulley flange on the radially outer side and the pulley axial direction outer side,
A belt mounting jig, wherein the holding surface is formed with a slip stopper for preventing slippage of the belt in the pulley rotation direction.   An inclined surface that allows a belt to slide into the pulley groove is formed continuously with the holding surface, and a slip stopper that prevents the belt from slipping in the pulley rotation direction is formed on the inclined surface. The belt mounting jig according to 1.   The fixing means includes a mounting hole that is fitted onto the boss portion of the pulley, and a protruding piece that protrudes from the holding surface so as to fit into the pulley groove across the pulley flange. The belt mounting jig according to claim 1, wherein a slip stopper is formed to prevent slippage of the belt.   4. The belt mounting jig according to claim 1, wherein the anti-slip is set such that a friction coefficient with respect to slippage of the belt in the pulley axial direction is set smaller than a friction coefficient with respect to slippage of the belt in the pulley rotation direction. Ingredients.   The belt attachment jig according to any one of claims 1 to 4, wherein the slip stopper is formed by groove processing.   The belt slip jig according to any one of claims 1 to 4, wherein the anti-slip is formed by embossing.   The belt is attached while rotating the one pulley through the belt by rotating the other pulley that is mounted on one of the plurality of pulleys and wound around the belt. 6. The belt mounting jig according to any one of 6 above.   The belt attachment jig according to claim 7, wherein the other pulley is a two-stage pulley.

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