JP2013083320A - V pulley with belt mounting and dismounting mechanism - Google Patents

Abstract

In a V pulley with a belt detaching mechanism, it is possible to easily detach it with a simple configuration without damaging the V belt.
A part of one side wall 4 of a V groove 2 to which a V belt 50 is mounted in a V pulley body 3 is cut out to form a notch, and a guide member 10 is connected to one side wall 4 in the V pulley body 3. The V belt 50 is guided to the notch as the V pulley body 3 is rotated. After the guide member 10 is removed, the fitting member may be fitted into a part of the V groove 2.
[Selection] Figure 1

Description

  The present invention relates to a V pulley with a belt detachment mechanism that facilitates detachment of a V belt.

  Conventionally, in a V-belt drive device that does not have an auto tensioner, if an attempt is made to forcibly mount the V-belt while maintaining an appropriate tension between the drive-side pulley and the driven-side pulley with a fixed inter-axis distance, It is known that it is difficult to attach and detach the V-belt which has to cross the side wall of the V-groove and has low elasticity. Since the V belt is thick and narrow, if you try to forcibly screw it into the V pulley, the bottom of the belt will be crushed by the end of the side wall of the V groove and it will be easily damaged. At the apex, there is a problem that the V-belt is prematurely damaged due to the tensile body breakage due to forced extension.

  Therefore, for example, as in Patent Document 1, a pulley mounting portion that fits in a V groove of a pulley and is attached to the pulley, a V belt scoop portion that separates the V belt radially outward from the V groove, and this V belt scoop portion. A V-belt attaching / detaching jig comprising a side guide portion for guiding the broken V-belt to the side, a pulley mounting portion, and a pulley rotating jig comprising a handle portion for rotating the pulley. V-belt detachers are known.

  Further, although not a V-belt, as in Patent Document 2, an enlarged-diameter flange is formed on one side of a pulley main body having external teeth with which the timing belt engages, and the other side of the pulley main body facing this flange The timing belt is locked to the belt, and one side of the timing belt is held in engagement with the external teeth from the locking portion, and the other side of the timing belt is guided to the side of the timing belt pulley from the locking portion. A timing belt pulley having a guide portion is known.

Japanese Patent Laid-Open No. 9-242834 JP 2005-195041 A

  However, in Patent Document 1, since the V-belt cannot be driven with the V-belt attaching / detaching jig fitted, the pulley rotating jig having a handle portion must be used to manually drive the V-pulley. There is a problem that becomes complicated and large-scale.

  Moreover, since the thing of patent document 2 is a toothed belt, it is not always necessary to provide a side wall like a V-groove, and it is possible to eliminate one flange of a pulley. If all of one of the side walls is lost, there is a problem that the V-belt comes off. Further, when the belt guiding portion cannot be removed, the mass balance of the pulley after the belt is attached is poor.

  The present invention has been made in view of such points, and an object of the present invention is to make it possible to easily attach and detach to a V pulley with a simple configuration without damaging the V belt.

  In order to achieve the above object, in the present invention, a guide member for guiding the V belt to the notch portion of the V groove is provided on the pulley body so as to be detachable.

Specifically, in the first invention, a V pulley main body having a notch part in which a part of one side wall of the V groove to which the V belt is mounted is cut out.
A guide member that is attached to a side surface of the one side wall side of the V pulley body, and that guides the V belt to the notch as the V pulley body rotates.
The guide member is configured to be detachable from the V pulley body.

  According to the above configuration, when the V-belt is attached or detached, the V-belt is attached to the V-groove even if the V-belt is not forcibly screwed by attaching the guide member and hanging the V-belt on the guide member and rotating the V pulley body. It is gradually inserted into. At this time, since the guide member is provided on the side surface of the V pulley body, it is possible to omit the installation of a handle or the like for manually rotating the V pulley without inhibiting the driving of the V belt.

In the second invention, in the first invention,
After removing the said guide member, it is further provided with the fitting member fitted by the said notch part at least.

  According to the above configuration, if the guide member is removed and the fitting member is fitted after the V-belt is attached, the mass balance of the V pulley body can be adjusted and vibration during rotation can be prevented. In addition, since the notch is filled, the appearance is improved.

In the third invention, in the first or second invention,
The guide member has a guide V-groove on which the V-belt is mounted, and the groove bottom of the guide V-groove gradually increases in radius from the center of the V pulley body and continues to the notch. doing.

  According to the above configuration, the V-belt placed on the guide V-groove is gradually fitted into the V-groove of the V-pulley while increasing the tension as the V-pulley main body rotates without excessively stretching the V-belt. Can do. Also, since the radius gradually increases, when the V pulley is turned by hand, the driving force at the start of rotation can be reduced. The driving force can be increased gradually, and the V belt suddenly fits into the V groove. No more pinching fingers.

In the fourth invention, in the first or second invention,
The guide member is
A guiding portion having an arcuate outer peripheral surface;
A connecting portion connected to the guide portion and straddling the notch,
And a mounting portion provided at the tip of the connecting portion and mounted on the bottom of the V-groove.

  According to said structure, the induction | guidance | derivation part connected with this attachment part by the connection part is attached to a pulley main body by mounting an attachment part in V groove | channel. When the V-belt is hung on the arcuate outer peripheral surface of the guide portion and the V pulley is rotated, the V belt is gradually fitted into the V groove. It is desirable that the thickness of the mounting portion is not excessively thick so that the tensile body is not broken by forced extension at the apex of the climbed portion.

In a fifth invention, in any one of the first to fourth inventions,
The width when viewed from the side of the notch is larger than the maximum width of the V-groove.

  According to the above configuration, the V-belt is easily passed from the guide V-groove to the V-groove across the notch, so that the V-belt can be easily fitted into the V-groove without being forcibly screwed and damaged.

  As described above, according to the present invention, the guide member attached to the side surface of the V-pulley body guides the V-belt to the V-groove whose side wall is notched along with the rotation of the V-pulley body. By being configured to be detachable from the V pulley body, it can be easily detached without damaging the V belt with a simple configuration.

  Further, since the fitting member is fitted into a part of the V groove after the guide member is removed, the mass balance at the time of rotating the V pulley can be prevented.

It is a perspective view which shows a mode that the V belt was attached to the guide member of the V pulley concerning Embodiment 1. FIG. It is a front view of a V pulley. It is a right view of V pulley. It is a left view of V pulley. Top view of V pulley It is a disassembled perspective view of V pulley. FIG. 3 is a view corresponding to FIG. 1 according to the second embodiment. It is a front view of a V pulley. It is the left side of a V pulley. It is a top view of V pulley. It is a disassembled perspective view of V pulley.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
1 to 5 show a V pulley 1 with a belt detaching mechanism according to a first embodiment of the present invention, and this V pulley 1 includes a V pulley body 3 having a V groove 2 to which a V belt 50 is mounted on the outer periphery. Yes.

  As shown in FIG. 6, a part of the side wall 4 constituting the V groove 2 of the V pulley body 3 is notched and a notch 5 is formed. As shown in FIG. 4, the width W2 when viewed from the side of the notch 5 is set to be larger than the maximum width W1 of the V-groove 2 (W2> W1). The notch 5 extends to the side surface 3a of the V pulley body 3 and is continuous with the fitting recess 6 that is recessed in the side surface 3a in a circular arc shape when viewed from the side. A fitting member 7 indicated by an imaginary line in FIG. 6 having a shape corresponding to the notch 5 and the fitting recess 6 can be fitted into the notch 5 and the fitting recess 6. Normally, the V-belt 50 is not applied with a force for shifting in the lateral direction. Therefore, the fitting member 7 may not be fitted and the cutout portion 5 may be left as it is. Although not shown in detail, in order to fix the fitting member 7 to the fitting recess 6, the size of the fitting member 7 may be adjusted and press-fitted, or the pulley body 3 with a screw or the like (not shown). You may make it fasten to. Considering the ease of detachment, a screw fastening structure is desirable. Further, it is desirable that the mass balance of the V pulley 1 is not biased when the fitting member 7 is fitted, and the height of the surface of the fitting member 7 and the side surface 3a are the same. And it looks good. Although not shown in detail, the V pulley body 3 has a boss portion into which the rotation shaft is inserted on the side surface opposite to the side surface 3a where the fitting recess 6 is provided.

  And when this fitting member 7 is removed, the guide member 10 can be attached to and detached from the notch 5 and the fitting recess 6. In a state where the guide member 10 is attached to the side surface 3a side of the one side wall 4 side of the V pulley body 3, the V belt 50 is inserted into the V groove 2 in which the side wall 4 is cut away as the V pulley body 3 rotates. Can be induced.

  As shown in FIG. 2, the guide V groove 11 of the guide member 10 has a groove bottom radius gradually increasing from the center of the V pulley body 3 (r1 <r2 <r3). The guide V-groove 11 is configured to be continuous with the notch 5 and reach the V-groove 2. The cross-sectional shape of the guide V-groove 11 may be a rectangular cross-section as shown in FIG. 3 or may be a V-shaped cross-section similar to the V-groove 2. In the case of a rectangular cross section, the V-belt 50 is appropriately bent when passing through the notch 5 and is not easily loaded. When the cross section is V-shaped, the cross-sectional shape may be changed so that the V-belt bends appropriately when passing through the notch 5.

  In addition, as shown in FIG. 4, if the rounded chamfered portion 5 a is formed by rounding the portion of the cutout portion 5 that contacts the right side surface of the V belt 50, damage to the V belt 50 can be more effectively prevented. .

  Next, a method of using the V pulley 1 with the belt detaching mechanism according to this embodiment will be described.

  When the V-belt 50 is attached, the guide member 10 is attached to the pulley body 3 as shown in FIGS.

  Then, as shown in FIG. 1, after one end of the V belt 50 is attached to the other V pulley 1, the other end is hooked on a part of the V groove 2 and hooked on the guide V groove 11 through the notch 5. At this time, as shown in FIG. 4, the width W2 when viewed from the side of the notch 5 is set larger than the maximum width W1 of the V-groove 2 (W2> W1). It is easy to pass from the guide V-groove 11 to the V-groove 2 across the notch 5. Further, as shown in FIG. 2, the groove bottom radius r1 on the inlet side of the guide V groove 11 is set smaller than the groove bottom radius r3 on the outlet side, so that the V belt 50 is not screwed in excessively. It can be mounted in the guide V-groove 11.

  Next, when the V pulley 1 is manually rotated so that the V belt 50 advances in the direction of the arrow in FIG. 1, the V belt 50 is gradually mounted from the guide V groove 11 to the V groove 2. Since the initial groove bottom radius r1 is set to be small, the V pulley can be easily rotated even manually, and the fingers are not forced to pinch. Further, there is no need to provide a handle for manually rotating the V pulley 1. In addition, since the load applied to the V-belt is reduced by forming the round chamfered portion 5a in the notch 5, the V-belt 50 is not excessively stretched and hurt.

  When the V pulley is rotated about 90 °, all the V belts 50 in the guide V groove 11 are fitted into the V groove 2.

  Even when the V pulley 1 is driven by driving the V pulley 1 with the guide member 10 still fitted, the guide member 10 is attached to the side surface 3a, so that the driving of the V belt 50 is not hindered. .

  On the other hand, as shown in FIG. 6, the guide member 10 may be removed, and the fitting member 7 may be fitted into the notch 5 and the fitting recess 6. In this case, the mass balance of the V pulley 1 is adjusted, vibration during rotation does not occur, and the appearance is improved.

  Therefore, according to the V pulley 1 with the belt detaching mechanism according to this embodiment, the V belt 50 can be easily detached without damaging it. In addition, since the fitting member 10 is fitted into a part of the V groove 2 after the guide member 10 is removed, the mass balance during rotation of the V pulley 1 can be prevented from being deteriorated.

(Embodiment 2)
7 to 10 show a V pulley 101 with a belt detaching mechanism according to a second embodiment of the present invention, which differs from the first embodiment in that the configuration of the guide member 110 is different. In the present embodiment, the same portions as those in FIGS. 1 to 6 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 11, the notch 105 of the pulley body 103 of the present embodiment has a shape in which only the side wall 4 is notched. For this reason, the shape of the fitting member 107 is also a simple shape fitted into the side wall 4. The fitting member 107 is configured to be detachable by fastening a screw (not shown) in the radial direction of the pulley body 103, for example.

  The guide member 110 includes a guide portion 111 having an arcuate outer peripheral surface 111a. The guide part 111 is configured by, for example, a cylindrical or round pipe shape. A connecting portion 112 extending in the axial direction of the pulley body 103 and straddling the notch portion 105 is connected to the guide portion 111. Further, an attachment portion 113 placed on the groove bottom of the V-groove 2 is connected to the tip of the connection portion 112. The inner diameter of the bottom surface of the mounting portion 113 is set substantially equal to the outer diameter of the groove bottom of the V groove 2. The thickness of the attachment portion 113 is set to be small so that the tensile body breakage due to forced extension does not occur at the apex of the portion where the V-belt 50 rides. The guide member 110 may fix the connecting portion 112 or the mounting portion 113 to the pulley body 103 with screws. Even if it is not fixed with a screw, the mounting portion 113 is provided, so that it is difficult to come off the pulley body 103 when the V belt 50 is hung. In this case, the attaching / detaching operation of the guide member 110 is further facilitated.

  In the present embodiment, first, when the V belt 50 of the V pulley 101 is mounted, the guide member 110 is fitted into the notch 105 so that the mounting portion 113 is placed in the V groove 2.

  Next, the other end of the V-belt 50 having one end attached to another pulley is hooked on a part of the V-groove 2 and is hooked on the arcuate outer peripheral surface 11 a through the notch 105. At this time, the distance from the center of the pulley body 103 on the arcuate outer peripheral surface 111a away from the notch 105 is smaller as it is farther from the notch 105 and is smaller than the groove bottom radius of the V-groove 2. It is not necessary to pull the V-belt 50 forcibly and can be easily mounted. In addition, since the thickness of the attachment portion 113 is set to be small, the tensile breakage due to the forced extension does not occur in the V-belt 50 at the portion riding on the attachment portion 113.

  Next, when the pulley is manually rotated in the direction indicated by the arrow in FIG. 7, the V belt 50 is gradually fitted into the V groove 2.

  Since the tension of the V-belt 50 gradually increases with the rotation, excessive tension is not applied to the V-belt 50, and the V-belt 50 is not damaged.

  Further, when the V pulley 50 is further rotated and the V belt 50 is completely installed in the V groove, it falls by its own weight when the guide member 110 is not fastened. When it is fixed by fastening or the like, the guide member 110 may be removed at a position where the V-belt 50 is not in contact.

  When the V belt 50 is applied to the arcuate outer peripheral surface 111 a of the guide portion 111, the distance from the center of the pulley main body 103 of the arcuate outer peripheral surface 111 a increases as the V pulley 1 is rotated. Therefore, the V belt 50 is gradually fitted into the V groove 2.

  Therefore, the V pulley 101 with the belt detaching mechanism according to the present embodiment can be easily detached without damaging the V belt 50, and a part of the V groove 2 can be removed after the guide member 110 is removed. If the fitting member 110 is fitted into the V pulley 101, the mass balance during the rotation of the V pulley 101 can be prevented from being deteriorated.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

  That is, in the above embodiment, the shape of the guide member has been described as in Embodiments 1 and 2. However, the shape of the guide member is not particularly limited to this shape. Any shape that can be attached is acceptable.

  In each of the above embodiments, the V pulley 1 and 101 has one V groove 2, but a plurality of V grooves may be arranged. In that case, a notch may be provided in a part of the side wall constituting each V-groove, and the V-belt 50 may be attached in order from the V-groove on the side farther from the guide member.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

1 V pulley (V pulley with belt attaching / detaching mechanism)
2 V groove 3 V pulley body 3a Side surface 4 Side wall 5 Notch 7 Fitting member 10 Guide member 11 Guide V groove 50 V belt 101 V pulley (V pulley with belt detaching mechanism)
103 Pulley body 105 Notch portion 107 Fitting member 110 Guide member 111 Guide portion 111a Arc-shaped outer peripheral surface 112 Connecting portion 113 Mounting portion

Claims (5)

A V pulley body having a notch part of which one side wall of the V groove to which the V belt is mounted is cut;
A guide member that is attached to a side surface of the one side wall side of the V pulley body, and that guides the V belt to the notch as the V pulley body rotates.
The V pulley with a belt detaching mechanism, wherein the guide member is configured to be detachable from the V pulley body. The V pulley with a belt detaching mechanism according to claim 1,
A V pulley with a belt detaching mechanism, further comprising a fitting member fitted into at least the notch after removing the guide member. In the V pulley with a belt detaching mechanism according to claim 1 or 2,
The guide member has a guide V-groove on which the V-belt is mounted, and the groove bottom of the guide V-groove gradually increases in radius from the center of the V pulley body and continues to the notch. A V pulley with a belt attaching / detaching mechanism characterized by the above. In the V pulley with a belt detaching mechanism according to claim 1 or 2,
The guide member is
A guiding portion having an arcuate outer peripheral surface;
A connecting portion connected to the guide portion and straddling the notch,
A V pulley with a belt attaching / detaching mechanism, comprising: an attachment portion provided at a tip of the connecting portion and mounted on a groove bottom of the V groove. The V pulley with a belt detaching mechanism according to any one of claims 1 to 4,
A V pulley with a belt detaching mechanism, wherein the width when viewed from the side of the notch is larger than the maximum width of the V groove.

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