Belt mounting tool

The present invention relates to a belt installation tool which is to be installed so as to cover at least a part of a first side surface of a pulley, including an attaching part attached along an outer peripheral part of the pulley, an installation part brought into contact with at least a part of the first side surface, a protection part covering at least a part of the first side surface without coming into contact therewith, and a belt holding part protruding on the protection part or on the installation part, in which the protection part covers at least a part of a part having a largest distance in a vertical direction in an area located inside the part with which the installation part comes into contact in the first side surface.

CROSS REFERENCE TO RELATED APPLICATIONS

This is a U.S. National Phase Application under 35 U.S.C. § 371 of International Application No. PCT/JP2014/066235, filed Jun. 19, 2014, which claims priority to Japanese Application Nos. 2013-128410 and 2014-122363, filed Jun. 19, 2013 and Jun. 13, 2014, respectively, the entire disclosures of which are incorporated herein by reference.

TECHNICAL FIELD

The present invention relates to a belt installation tool used when a belt is wound on a plurality of pulleys.

BACKGROUND ART

Generally, in a belt driving mechanism in which a belt is wound on a plurality of pulleys, a circumferential length of the belt is shortened compared with a circumferential length of a layout between the pulleys as an attaching object so as to apply high tension to the belt in order to reliably transmit a power between the pulleys.

An operation that such a belt whose circumferential length is shorter than the circumferential length of the layout between the pulleys is wound on the pulleys may require a power against a tension of the belt and take time and labor in some cases. To reduce the time and labor, Patent Literature 1 discloses a tool which extends a belt in a circumferential direction to support an operation for winding it on an outer periphery of a pulley.

The Patent Literature 1 discloses a very compact belt installation tool which lowers the belt tension acting during an attachment of the belt between pulleys to improve an attaching property. Such a belt installation tool is excellent in its portability and can be arranged in the pulleys with various configurations, and therefore is useful.

Further, when the belt installation tool disclosed in the Patent Literature 1 is arranged on pulleys having no protrusions (the pulleys having relatively flat side surfaces) on side surfaces of the pulleys to attach a belt between the pulleys, a possibility is extremely low that the belt or the pulleys may be damaged.

CITATION LIST

Patent Literature

SUMMARY OF INVENTION

Problem that the Invention is to Solve

However, when the belt installation tool disclosed in the above-described Patent Literature 1 is arranged on pulleys having protrusions on side surfaces of the pulleys to attach a belt between the pulleys, there is a possibility that the belt may come into contact with the protrusions to damage the belt or the pulleys (seeFIG. 12).

For instance, in the case of a compressor pulley, a clutch hub of a magnet clutch is fitted to a shaft of a compressor. When the compressor is not driven, only the pulley is rotated. However, when an air conditioner switch is turned on, an electric current is supplied to a coil embedded in a stator, which becomes a strong magnet to strongly attract the clutch hub, which is allowed to be press-bonded against the pulley, and the compressor is rotated. The clutch hub of the pulley protrudes from a side surface of the pulley. During an attachment of a belt, since the belt is pressed against the protruding clutch hub (a protrusion) of the compressor pulley to harshly interfere with the pulley, not only the belt, but also the pulley itself including the clutch hub may be damaged in some cases (see Patent Literature 2).

Thus, the present invention is made to solve the problems as described above, and provides a belt installation tool by which a belt can be smoothly attached without interfering with a protrusion even when the belt is wound on the pulley having the protrusion on a side surface of the pulley and a damage of the belt or the pulley itself due to a contact of the protrusion and the belt can be prevented.

Means for Solving the Problems

One embodiment of the present invention for solving the above-described problems is a belt installation tool which is to be installed so as to cover at least a part of a first side surface of a pulley, which the belt installation tool includes:

an attaching part which is attached along an outer peripheral part of the pulley,

an installation part which is brought into contact with at least a part of the first side surface of the pulley,

a protection part which covers at least a part of the first side surface without coming into contact with the first side surface of the pulley, and

a belt holding part which protrudes on the protection part near the outer peripheral part of the pulley, or on the installation part,

in which the protection part covers at least a part of a part having a largest distance in a vertical direction from a plane defined by a part with which the installation part comes into contact in the first side surface in an area located inside the part with which the installation part comes into contact in the first side surface of the pulley.

According to the above-described configuration, since the attaching part is attached along the outer peripheral part of a pulley and the installation part is allowed to come into contact with a part of the first side surface of the pulley and fixed, the belt installation tool can be stably installed on the pulley.

Further, since the protection part covers at least a part of a part which has a largest distance in the vertical direction from a plane defined by a part with which the installation part comes into contact in the first side surface in an area located inside the part with which the installation part comes into contact in the one side surface of the pulley (including a case where the distance from the plane defined by the part with which the installation part comes into contact in the first side surface is 0), at the time when a belt is wound on the pulley, the part having the largest distance in the vertical direction from the plane defined by the part with which the installation part comes into contact in the first side surface can be prevented from interfering with the belt and the part having the largest distance in the vertical direction from the plane defined by the part with which the installation part comes into contact in the first side surface and the belt can be protected.

Further, since the belt holding part protrudes near the outer peripheral part of the pulley on the protection part, or on the installation part, the belt holding part does not protrude outside (outside in the radial direction) from the outer peripheral part of the pulley. Thus, it can be used even in the case where there is no room in a physical space in the outer peripheral part side of a pulley.

When the belt installation tool is installed on a pulley and a belt is transferred to an outer peripheral part of the pulley from a state that the belt is wound on the belt holding part, the belt can be smoothly slid on the protection part and transferred. Thus, when the belt is transferred to the outer peripheral part of the pulley from the state that the belt is wound on the belt holding part, the belt is prevented from being interfered with the part having the largest distance in the vertical direction from the plane defined by the part with which the installation part comes into contact in the first side surface of the pulley and the belt or the pulley itself can be prevented from being damaged.

Further, according to one embodiment of the present invention for solving the above-described problem, in the belt installation tool, the installation part is connected to the protection part in a stepped form.

According to the above-described configuration, since the protection part is connected to the installation part in the stepped form so that a gap is formed by the step between the part having the largest distance in the vertical direction from the plane defined by the part with which the installation part comes into contact in the first side surface and the protection part, the protection part does not come into contact with the part having the largest distance in the vertical direction from the plane defined by the part with which the installation part comes into contact in the first side surface and can reliably cover the part.

Further, according to one embodiment of the present invention for solving the above-described problem, in the belt installation tool, the attaching part has a circular arc form so as to extend along the outer peripheral part of the pulley.

According to the above-described configuration, since the attaching part is configured in the circular arc form so as to extend along the outer peripheral part of the pulley, the belt installation tool can be stably attached to the outer peripheral part of the pulley.

Further, according to one embodiment of the present invention for solving the above-described problem, in the belt installation tool, the attaching part is further provided with a rib part which is fitted to a groove part provided in the outer peripheral part of the pulley.

According to the above-described configuration, since the attaching part is provided with the rib part which fits to the groove part provided in the outer peripheral part of the pulley, the belt installation tool can be more stably attached to the outer peripheral part of the pulley.

Further, according to one embodiment of the present invention for solving the above-described problem, in the belt installation tool, the attaching part has a circular arc length formed to have a central angle being within a range of 30 to 120°.

When the circular arc length of the attaching part is formed to have a central angle smaller than 30°, the circular arc length of the attaching part is relatively short to an outer peripheral length of the pulley, so that the installation of the belt installation tool on the pulley may not be stable in some cases. On the other hand, when the circular arc length of the attaching part is formed to have a central angle exceeding 120°, the circular arc length of the attaching part is relatively long to the outer peripheral length of the pulley, so that the installation or disinstallation of the belt installation tool on or from the pulley is not easy.

Thus, as described above, when the circular arc length of the attaching part is formed to have a central angle within a range of 30 to 120°, the installation or disinstallation of the belt installation tool on or from the pulley can be made easy while stabilizing the installation of the belt installation tool on the pulley.

Further, according to one embodiment of the present invention for solving the above-described problem, in the belt installation tool, the pulley has a protrusion on the first side surface and the protection part covers at least a part of the protrusion.

According to the above-described configuration, since the protection part covers the protrusion, the protrusion is prevented from interfering with the belt when the belt is wound on the pulley, so that the protrusion and the belt can be protected.

Advantageous Effects of Invention

The belt installation tool can be provided by which even when a belt is wound on a pulley having a protrusion on a side surface of the pulley, the belt can be smoothly attached without interfering with the protrusion and a damage of the belt or the pulley itself due to a contact of the protrusion and the belt can be prevented.

MODE FOR CARRYING OUT THE INVENTION

Embodiments

By referring to the drawings, an embodiment of the present invention will be described below. A belt installation tool9according to the present embodiment is used when a V-ribbed belt4which is extensible in a direction of a circumferential length is wound between a first pulley2and a second pulley3as illustrated inFIG. 1.

As illustrated in (a) and (b) ofFIG. 1, in a casing1, the first pulley2connected to a crank shaft of an engine or the like and the second pulley3connected to a shaft of a compressor of an air conditioner or the like are supported so as to freely rotate with a prescribed distance between the shafts spaced. Then, the V-ribbed belt4is wound between the first pulley2and the second pulley3, so that a power of the crank shaft of the engine or the like is transmitted to the shaft of the compressor through the first pulley2, the V-ribbed belt4, and the second pulley3in this order so as to rotate the compressor. In the present embodiment, the distance between the shafts of the first pulley2and the second pulley3cannot be changed. Further, so-called automatic tensioner (a tension applying unit), which applies a tension to the V-ribbed belt4, is not mounted.

(Structures of First Pulley2and Second Pulley3)

The first pulley2has a pulley groove (a groove provided in an outer peripheral part of the first pulley2) which can be fitted to a rib4aformed in an inner peripheral surface of the V-ribbed belt4. Further, to a boss part2cformed in a central part of the first pulley2, the crank shaft of the engine or the like is inserted.

On the other hand, as illustrated in (a) to (c) ofFIG. 2, the second pulley3includes a compressor pulley3a, a clutch hub3barranged in one side surface of the compressor pulley3aand a stator3carranged in the other side surface of the compressor pulley3a. The compressor pulley3aand the stator3care fitted to the shaft of the compressor so as to freely rotate. The clutch hub3bis fixed to the shaft of the compressor. As illustrated in (c) ofFIG. 2, the clutch hub3bof the second pulley3is arranged so as to protrude from a side surface3gof the compressor pulley3a. The clutch hub3bcorresponds to a protrusion protruding in an axial direction of the second pulley3.

Then, in the second pulley3, when the compressor is not driven, only the compressor pulley3ais rotated. However, for instance, when a switch of the air conditioner is turned on, an electric current is supplied to a coil embedded in the stator3c, which becomes a powerful magnet to strongly attract the clutch hub3b, so that the clutch hub3bis pressed against the compressor pulley3a. Thus, the clutch hub3b, the compressor pulley3aand the stator3care integrated to transmit the rotation of the compressor pulley3ato the shaft of the compressor from the integrated clutch hub3b, so that the compressor is rotated.

Further, as illustrated inFIG. 2, the compressor pulley3aof the second pulley3has a pulley groove3d(a groove provided in an outer peripheral part3jof the second pulley) which can be fitted to the rib4aformed in the inner peripheral surface of the V-ribbed belt4and includes a pair of pulley flanges3eand3fwhich hold the pulley groove3din the axial direction of the pulley. The pulley flanges3eand3fare formed so as to slightly protrude outward from the pulley groove3din the radial direction of the second pulley3in a side view of (c) ofFIG. 2. Further, to a boss part5of the second pulley3, the shaft of the compressor is inserted and fixed to the clutch hub3b. Reference numerals3gand3hillustrate side surfaces of the second pulley3.

The V-ribbed belt4is so-called low modulus belt which is a little extensible in a direction of a circumferential length thereof. Since a polyamide fiber is used for a tension member, the low modulus belt has a relatively low modulus of elasticity. Thus, a sudden deterioration of tension is more suppressed than that having a high modulus of elasticity (so-called high modulus belt).

Further, an arrow mark V of a thick line in (a) ofFIG. 1indicates a running direction of the V-ribbed belt4. A rotating direction of the second pulley3when the V-ribbed belt4is driven in the running direction is defined as a first rotating direction A and an opposite direction to the first rotating direction A is defined as a second rotating direction B.

(Structure of Belt Installation Tool9)

Next, referring toFIG. 3andFIG. 4, a structure of the belt installation tool9according to the present embodiment will be described.

As illustrated inFIG. 3andFIG. 4, the belt installation tool9includes, as a main structure, an attaching part11attached along the outer peripheral part3jof the second pulley3, an installation part12which is brought into contact with the pulley flange3epart of the one side surface3gof the second pulley3, a protection part13which covers the clutch hub3b(the protrusion) of the second pulley3, and a belt holding part14provided on the protection part13.

The attaching part11is configured in a circular arc form (a curved form) so as to extend along the outer peripheral part3jof the compressor pulley3aof the second pulley3. Further, in an inner peripheral surface side of the attaching part11, provided is a rib11a(a rib part) which is fitted to the pulley groove3dprovided in the outer peripheral part3jof the compressor pulley3aof the second pulley3. Further, a circular arc length11bof the attaching part11is formed in such a way that a central angle α in a central part11cof a circular arc is 120° as illustrated inFIG. 4.

In the present embodiment, the central angle α is set to be 120°. However, the central angle α of the circular arc length11bmay be set to be within a range of 30 to 120° (preferably, 30 to 90°). As one of reasons thereof, there can be mentioned that when the central angle α of the circular arc length11bof the attaching part11is formed to be smaller than 30° (the central angle α<30°), the circular arc length11bof the attaching part11is relatively short to an outer peripheral length of the outer peripheral part3jof the compressor pulley3aof the second pulley3, and therefore there is a possibility that the installation of the belt installation tool9on the second pulley3is not stable. Further, as another of the reasons thereof, there can be mentioned that when the central angle α of the circular arc length11bof the attaching part11is formed to exceed 120° (the central angle α>120°), the circular arc length11bof the attaching part11is relatively long to the outer peripheral length of the outer peripheral part3jof the compressor pulley3aof the second pulley3, and therefore there is a possibility that the installation or disinstallation of the belt installation tool9on or from the second pulley3is not easy.

The rib11ais formed with one protruding rib along a longitudinal direction of the inner peripheral surface of the attaching part11. When the belt installation tool9is attached to the second pulley3, the rib11ais fitted to the pulley groove3dof the compressor pulley3a, so that the belt installation tool9can be accurately fixed to the outer peripheral part3jof the compressor pulley3a. The present embodiment is configured to have only one rib11aprovided. In order to form the rib11a, at least one protruding rib may be provided, and, a plurality of ribs11amay be provided.

The installation part12is extended from one end of the attaching part11to the boss part5of the second pulley3. A width of the installation part12extending toward a direction of the boss part5corresponds to a width of the pulley flange3eas illustrated inFIG. 6. The installation part12is attached on or comes into close contact with the pulley flange3eprovided in the compressor pulley3aof the second pulley3at the time when the belt installation tool9is attached to the second pulley3, and it serves to stabilize the belt installation tool9to the second pulley3.

The protection part13has, as illustrated inFIG. 4, a partly cut-out part13bprovided from a circular form and is configured to have a step13arelative to the installation part12. Namely, in the present embodiment, the installation part12is connected to the protection part13in a stepped form through the step13a. As illustrated inFIG. 6, the step13aof the protection part13serves to form a gap13cbetween the protection part13and the clutch hub3bof the second pulley3at the time when the belt installation tool9is attached to the second pulley3, so as to suppress the protection part13from coming into contact with the clutch hub3b. In such a way, the protection part13serves to cover the clutch hub3bwhile avoiding from coming into contact with the clutch hub3b. In the present embodiment, the step13ais provided between the installation part12and the protection part13, however, the installation part12and the protection part13may be continuously curved without providing the step13a.

Here, the protection part13is provided so as to cover at least a part of a part which has the largest distance in a vertical direction from a plane defined by a part with which the installation part12comes into contact in the one side surface3gof the second pulley3in an area located inside the part with which the installation part12comes into contact in the one side surface3g(the side surface of a side which is covered with the protection part13) of the second pulley3. Namely, in the present embodiment, it is provided so as to cover at least a part of the clutch hub3bas the protrusion protruding most outward in the axial direction in the area located inside the pulley flange3e. The protection part13preferably covers at least a substantial center of the side surface3gof the second pulley3. Namely, in the present embodiment, it preferably covers the boss part5. As a covering ratio, the protection part13preferably covers, for instance, half or more of the side surface3g(the side surface of the side which is covered with the protection part13) of the second pulley3. Namely, the protection part13preferably covers 50 to 100% (the central angle of 180° to 360°) as large as the side surface3gof the second pulley3. When the covering ratio is smaller than 50%, the V-ribbed belt4severely interferes with the second pulley3during an attachment of the V-ribbed belt4, so that at least one of them may be probably damaged.

Further, since the size of the gap13cis suitably set depending on properties of an applied pulley (a misalignment limit or the like), it is not especially limited, however, for instance, it preferably exceeds 0 mm and is about 3.5 mm or smaller.

Further, in the attaching part11, the installation part12and the protection part13, parts which come into contact with the V-ribbed belt4are chamfered to have curved configurations. They are provided so as not to damage the V-ribbed belt4at the time when the V-ribbed belt4is wound on the second pulley3by using the belt installation tool9.

As illustrated inFIG. 4, the belt holding part14is provided to protrude on the protection part13and arranged so as to be located in the outer peripheral part3jside of the compressor pulley3aat the time when the belt installation tool9is attached to the second pulley3. The belt holding part14serves to temporarily hold the V-ribbed belt4at the time when the V-ribbed belt4is wound on the second pulley3. As in the present embodiment, a part of the belt holding part14may be provided in the installation part12.

More specifically, as illustrated inFIG. 7toFIG. 9, the belt holding part14protrudes in such a way that when the V-ribbed belt4is introduced to the outer peripheral part3jof the compressor pulley3athrough the belt holding part14, an inner peripheral surface of the V-ribbed belt4comes into contact with a holding surface14aof the belt holding part14and a side surface of the V-ribbed belt4comes into contact with the protection part13so that a stepped part is formed between a position of the V-ribbed belt4held by the belt holding part14and a position of the V-ribbed belt4introduced to the outer peripheral part3jof the compressor pulley3a. The belt holding part14serves to bend the V-ribbed belt4and extend it along the outer peripheral part3jof the compressor pulley3aat the time when the V-ribbed belt4is wound on the second pulley3. In the belt holding part14, the part which comes into contact with the V-ribbed belt4at the time of winding the V-ribbed belt4is chamfered to have a curved configuration. This is provided so as not to damage the V-ribbed belt4at the time of winding the V-ribbed belt4.

(Using Method of Belt Installation Tool9)

Next, referring toFIG. 5toFIG. 9, a using method of the above-described belt installation tool9will be described. A wrench is connected to the boss part2cof the first pulley2so that the first pulley2can be manually and freely rotated.

Initially, as illustrated inFIG. 5, the belt installation tool9is attached to the second pulley3so that the attaching part11is extended along the outer peripheral part3jof the compressor pulley3aof the second pulley3. At this time, the rib11aprovided in the attaching part11is fitted to the pulley groove3dof the compressor pulley3aand the installation part12is brought into contact with the pulley flange3eprovided in the compressor pulley3a. Thus, the protection part13is in a state to cover the clutch hub3bwhile forming the gap13cwith respect to the clutch hub3b(see an A-A cross-sectional view ofFIG. 6).

Under this state, as illustrated inFIG. 7, the V-ribbed belt4is wound on the first pulley2. Then, after the V-ribbed belt4is extended along the outer peripheral part3jof the compressor pulley3aof the second pulley3, it is allowed to step over the attaching part11and the installation part12, bent on an edge of the belt holding part14and wound so that the inner peripheral surface of the V-ribbed belt4comes into contact with the belt holding part14. At this time, as illustrated inFIG. 7, the V-ribbed belt4bent by the belt holding part14is in a state to be wound on the first pulley2while passing on the protection part13.

Then, as illustrated inFIG. 7, the first pulley2and the second pulley3is rotated by using the wrench in the first rotating direction A.

Specifically, the first pulley2and the second pulley3are first rotated in the first rotating direction A so as to have a state illustrated inFIG. 8from the state illustrated inFIG. 7. Then, the V-ribbed belt4is stretched and a high tension is generated. Since the V-ribbed belt4crosses on the attaching part11, the tension serves as a pressing action which presses the attaching part11against the outer peripheral part3jof the second pulley3. Thus, the belt installation tool9is more strongly fixed to the second pulley3.

Further, when the first pulley2and the second pulley3are rotated in the first rotating direction A so as to obtain the state illustrated inFIG. 8from the state illustrated inFIG. 7, the V-ribbed belt4on the protection part13slides to a direction C in accordance with the rotation. Then, the V-ribbed belt4wound on the belt holding part14of the belt installation tool9moves to the outer peripheral part3jof the compressor pulley3a. Specifically, when the second pulley3is rotated in the first rotating direction A, an area where the rib4aof the V-ribbed belt4is fitted to the pulley groove3dof the compressor pulley3aof the second pulley3is gradually increased.

Further, the first pulley2and the second pulley3are rotated in the first rotating direction A so as to obtain a state illustrated inFIG. 9from the state illustrated inFIG. 8. Then, the V-ribbed belt4remaining on the protection part13departs from the protection part13and completely moves to the outer peripheral part3jof the compressor pulley3aof the second pulley3. After the movement, the belt installation tool9is recovered from the second pulley3.

Through the above-described procedures, the V-ribbed belt4can be wound between the first pulley2and the second pulley3as illustrated inFIG. 1.

As described above, in the belt installation tool9according to the present embodiment, since the attaching part11is attached along the outer peripheral part3jof the compressor pulley3aof the second pulley3and the installation part12is fixed to come into contact with the pulley flange3eof the compressor pulley3aof the second pulley3, the belt installation tool9can be stably installed on the second pulley3.

Further, the protection part13covers at least a part of the clutch hub3bas the protrusion protruding most outward in the axial direction in the area located inside the pulley flange3e. Thus, at the time when the V-ribbed belt4is wound on the second pulley3, the clutch hub3bis prevented from interfering with the V-ribbed belt4, so that the clutch hub3band the V-ribbed belt4can be protected.

Further, since the belt holding part14protrudes near the outer peripheral part of the second pulley3on the protection part13, the belt holding part14does not protrude outside (outside in a radial direction) from the outer peripheral part3j. Thus, even in the case where there is no room in a physical space outside in the radial direction of the second pulley3, it can be used.

Then, when the belt installation tool9is installed on the second pulley3and the V-ribbed belt4is moved to the outer peripheral part3jof the second pulley3from the state that the V-ribbed belt4is wound on the belt holding part14, the V-ribbed belt4can be smoothly slid and moved on the protection part13. Thus, when the V-ribbed belt4is moved to the outer peripheral part3jof the second pulley3from the state that the V-ribbed belt4is wound on the belt holding part14, the V-ribbed belt4is prevented from being interfered with the clutch hub3bof the second pulley3, so that the V-ribbed belt4and the second pulley3itself can be prevented from being damaged.

Further, according to the above-described configuration, the protection part13is connected to the installation part12in the stepped form by providing the step13atherebetween so that the gap13cmay be formed by the step13abetween the clutch hub3band the protection part13. Thus, the protection part13can reliably cover the clutch hub3bwithout coming into contact with the clutch hub3b.

Further, according to the above-described configuration, since the attaching part11is configured in a circular arc form so as to extend along the outer peripheral part3jof the compressor pulley3aof the second pulley3, the belt installation tool9can be stably attached to the outer peripheral part3jof the second pulley3.

Further, according to the above-described configuration, since the attaching part11is provided with the rib11awhich is fitted to the pulley groove3dprovided in the outer peripheral part3jof the compressor pulley3aof the second pulley3, the belt installation tool9can be more stably attached to the outer peripheral part3jof the second pulley3.

Further, as described above, when the circular arc length11bof the attaching part11is formed to have a central angle α being within a range of 30 to 120°, the installation or disinstallation of the belt installation tool9on or from the second pulley3can be made easy while stabilizing the installation of the belt installation tool9on the second pulley3.

OTHER EMBODIMENTS

The belt installation tool9according to the above-described embodiment has the structure that the rib11ais provided in the inner peripheral surface side of the attaching part11. However, as illustrated inFIG. 10, a rib may not be provided in an inner peripheral surface side of an attaching part11. In this case, since no rib is provided, a production cost can be reduced. Further, stability at the time when the belt installation tool9is attached to the second pulley3can be secured in such a way that an attaching part111having no rib is brought into contact with the outer peripheral part3jof the second pulley3and an installation part12is brought into contact with the pulley flange3e.

Further, as illustrated inFIG. 11, an attaching part211of a belt installation tool9may be formed to have such a width as to cover the outer peripheral part3jof the compressor pulley3ain a width direction (a width in an axial direction of the second pulley3). In this case, in the attaching part211, a contact part211dwhich comes into contact with a pulley flange3fof the compressor pulley3amay be provided. By providing the contact part211d, the installation of the belt installation tool9on the second pulley3can be made more stable. Further, in an inner peripheral surface side of the attaching part211illustrated inFIG. 11, one or a plurality of ribs may be formed.

In the above-described embodiment, described is a case where the belt installation tool9is used to be attached to the second pulley3having the clutch hub3bas the protrusion. However, the belt installation tool9can be used by being installed on a pulley in which a distance from a plane defined by a part with which the installation part12comes into contact in a side surface3gof the second pulley3is “0”, that is, the pulley having no protrusion.

While the embodiments of the present invention are described above, the present invention is not limited to the above-described embodiments and may be variously changed and embodied within a range which is described in the scope of claims.

The present application is based on Japanese patent Application No. 2013-128410 filed on Jun. 19, 2013 and Japanese Patent Application No. 2014-122363 filed on Jun. 13, 2014 and contents thereof are incorporated herein by reference.

DESCRIPTION OF REFERENCE NUMERALS AND SIGNS

9Belt installation tool

14Belt holding part

A First rotating direction