JP5930949B2 - Belt mounting jig - Google Patents

Description

  The present invention relates to a belt mounting jig used for a multi-stage pulley.

  In general, in a belt transmission mechanism in which a belt is wound around a plurality of pulleys, the belt circumference is shorter than the layout circumference between pulleys to be mounted in order to reliably transmit power between the pulleys, and is strong against the belt. Specifications are such that tension is applied.

  Thus, the operation of winding a belt having a belt circumference shorter than the layout circumference between the pulleys around the pulley requires a force against the belt tension, which may be troublesome. Such trouble becomes more prominent when the belt is wound around a multi-stage pulley having a plurality of pulleys arranged in parallel (see the two-stage pulley 2 in FIG. 1).

  For example, as shown in FIG. 1B, when the V-ribbed belt 4 is wound between the auxiliary pulley 3 and the rear pulley 22 of the two-stage pulley 2, it is once wound on the front pulley 21 and then on the front side. A method of shifting the V-ribbed belt 4 wound around the pulley 21 to the back pulley 22 is employed. As described above, the reason for passing the front pulley 21 without winding the V-ribbed belt 4 around the back pulley 22 at a time is that the front pulley 21 connects the back pulley 22 and the auxiliary pulley 3 to the V-ribbed belt 4. If the position is offset from the travel line and the offset increases, it may be difficult to attach the V-ribbed belt 4 during the mounting process. In addition, when the offset is large as described above, if the V-ribbed belt 4 is wound around the back pulley 22 at a time, the V-ribbed belt 4 is excessively stretched and a large load is applied, and permanent deformation occurs in the V-ribbed belt 4. This is one of the reasons why the V-ribbed belt 4 passes through the front pulley 21 without being wound around the back pulley 22 at a time.

  In the two-stage pulley 2 as described above, Patent Document 1 discloses a belt mounting jig for facilitating the work when shifting the V-ribbed belt 4 wound around the front pulley 21 to the back pulley 22. ing.

  The belt attachment jig disclosed in Patent Document 1 is capable of switching between an attachment posture for attaching the belt and a shift posture for shifting the belt to the back side, and once the belt of the first pulley which is a two-stage pulley is used. The belt is wound around the front pulley and the belt is positioned on the front side. In this state, the belt attachment jig is attached to the second pulley in the attachment posture, and the belt is attached without being caught on the side surface on the front side. After that, the belt attachment jig is reattached to the first pulley in a shift posture, the belt wound around the front pulley is shifted to the rear pulley, and the belt is attached to the rear pulley of the two-stage pulley. . In this way, the belt can be easily attached while preventing the side surface of the front pulley of the two-stage pulley and the belt from being caught.

  More specifically, the jig body, a locking portion for locking the jig body to the pulley flange, a protrusion protruding from the jig body to the back side, and a belt that can be extended in the circumferential direction. A guide surface formed on the projecting portion so as to guide the rear side in the pulley axial direction, an attachment posture for attaching the belt to the pulley groove on the pulley, and a front side pulley of the two-stage pulley. It is a belt mounting jig that can be mounted with a shift posture to shift to the rear pulley.

Japanese Patent No. 49886619

  However, in the belt mounting jig described in the above-mentioned Patent Document 1, in the shift posture stage, the belt is moved along the inclined guide surface 8 while being shifted from the front pulley of the two-stage pulley to the rear pulley. Since the guide surface 8 is inclined, the belt may slip and the belt may flow outward, and it may not be possible to make a successful transition from the near side pulley to the far side pulley.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a multi-stage pulley including a plurality of pulleys including at least a front pulley and a rear pulley, and a base shaft. When winding the belt between the pulley and the pulley, the belt wound between the base pulley and the front pulley can be easily shifted from the front pulley to the back pulley, and the belt is more reliably secured. An object of the present invention is to provide a belt mounting jig that can be wound around a belt.

  A first invention for solving the above-described problem is that a plurality of pulleys including at least a front pulley and a rear 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 a belt that can expand and contract in the circumferential direction. A main body having a shape along the outer peripheral surface of the plurality of stepped pulleys and an inner peripheral surface of the main body, and the inner peripheral surface of the main body is locked to the outer peripheral surface of the front pulley. A first locking portion that is provided on the inner peripheral surface side of the main body portion, a second locking portion that locks the inner peripheral surface of the main body portion on the outer peripheral surface of the rear pulley, and Provided on the outer peripheral surface side and introduced from the outer peripheral surface of the front pulley. An inlet defining region for inclining the belt, and a rear pulley side wall portion having a rear pulley surface region for guiding the belt by facing one surface of the belt inclined by the inlet defining region; A front pulley surface region that guides the belt by facing the other surface of the belt that is provided on the outer peripheral surface side of the main body portion and is inclined by the inlet defining region, and the front pulley surface region and the back surface A front pulley side wall portion having an outlet defining region for inclining the belt guided by the belt passage formed by the side pulley surface region again along the outer peripheral surface of the back pulley. It is characterized by.

According to said structure, the main-body part has the shape which follows the outer peripheral surface of a multi-step pulley, and also the 1st latching | locking part which latches the inner peripheral surface of a main-body part to the outer peripheral surface of a near pulley, and Since the second locking portion for locking the inner peripheral surface of the main body portion is provided on the outer peripheral surface of the rear pulley, the belt mounting jig is connected to the outer pulley of the front pulley and the rear pulley constituting the multi-step pulley. It can be installed reliably along the line.
In addition, when shifting the belt wound between the base pulley and the front pulley from the front pulley to the back pulley, a belt mounting jig is installed along the outer circumference of the front pulley and the back pulley. The belt introduced from the outer peripheral surface of the front pulley is inclined at the entrance regulation area of the rear pulley side wall, and the inclined belt is moved to the front pulley surface area of the front pulley side wall and the rear side of the rear pulley side wall. The belt can be guided by a belt path formed by the pulley surface area, and the guided belt can be easily inclined so as to be along the outer peripheral surface of the back pulley by being inclined again by the outlet defining area.
In addition, when the belt is shifted from the front pulley to the back pulley, the belt is held by using the inlet defining region and the outlet defining region where the belt is inclined as a support portion. It is possible to prevent the belt from being detached from the belt mounting jig by slipping or sliding in the direction.
Further, by guiding the belt introduced into the belt path formed by the front pulley surface area and the back pulley surface area, the belt can be smoothly shifted from the front pulley to the back pulley.

  Further, according to a second invention, in the belt attachment jig according to the first invention, when the entrance defining region is viewed from a direction facing the entrance defining region, the outer peripheral surface of the main body portion and the entrance defining region The outlet defining region is inclined in the direction of the back pulley so that an angle formed between the outlet defining region and the outlet defining region is viewed from a direction facing the outlet defining region. It is characterized in that it is inclined in the direction of the rear pulley so that the angle formed between the two is an acute angle.

  According to said structure, when inclining a belt in an entrance prescription | regulation area | region and an exit prescription | regulation area | region, the inclination of a belt can be maintained at an angle smaller than 90 degrees. That is, it is possible to shift the front pulley to the back pulley without inclining the belt more than 90 °. According to this, the belt can be smoothly introduced from the front pulley to the inlet defining region without excessive stress due to the inclination of the belt, and the belt can be smoothly shifted from the outlet defining region to the rear pulley. it can.

  Moreover, when 3rd invention is the belt attachment jig which concerns on 1st or 2nd invention, when the said back side pulley surface area | region is seen from the direction which faces the said entrance regulation area | region, it is the said main-body part outer peripheral surface, Inclined in the direction of the back pulley so that the angle formed by the back pulley surface region is an obtuse angle, and the front pulley surface region is viewed from the direction facing the inlet defining region when the main body portion is It is characterized in that it is inclined in the direction of the back pulley so that the angle formed by the outer peripheral surface and the front pulley surface region is an acute angle.

  According to the above configuration, when the belt is guided by the belt passage formed by the front pulley surface region and the back pulley surface region, the belt can be guided by being inclined at an angle smaller than 90 °. That is, the belt can be guided from the entrance defining region to the exit defining region via the belt passage without being inclined more than 90 °. According to this, the belt can be smoothly guided from the entrance defining area to the exit defining area without applying excessive stress to the belt due to the inclination.

  According to a fourth aspect of the present invention, in the belt attachment jig according to any one of the first to third aspects, the belt passage formed by the front pulley surface region and the back pulley surface region is the inlet. It is characterized in that it is inclined in the direction of the rear pulley from the specified area to the outlet specified area.

  According to the above configuration, when the front pulley is at a position offset from the running line of the belt connecting the back pulley and the base pulley, the pulley is wound between the base pulley and the front pulley and is in an offset state. The belt is shifted from the front pulley to the back pulley while smoothly eliminating the offset state of the belt by passing the belt through the belt path inclined toward the back pulley from the entrance specifying region to the outlet specifying region. be able to.

  According to a fifth aspect of the invention, in the belt attachment jig according to the fourth aspect of the invention, the belt passage is formed such that an angle formed between a side surface of the rear pulley and the belt passage is in a range of 15 ° to 60 °. It is characterized by having.

  According to said structure, the excessive angle with respect to a belt can be prevented, maintaining compactness by making the angle | corner which the side surface of a back pulley and a belt path make into the range of 15 degrees-60 degrees. it can.

  According to a sixth aspect of the present invention, in the belt mounting jig according to any one of the first to fifth aspects, the first locking portion is fitted in a concave groove provided on the outer peripheral surface of the front pulley. It is characterized by being formed of at least one convex rib.

  According to said structure, since the 1st latching | locking part is formed with the at least 1 convex-shaped rib fitted to the concave-shaped groove part provided in the outer peripheral surface of a near pulley, belt mounting jig | tool is And it can install correctly in the outer periphery of the near pulley which comprises a multistage pulley.

  According to a seventh aspect of the present invention, in the belt mounting jig according to any one of the first to sixth aspects, the second locking portion is fitted into a concave groove provided on the outer peripheral surface of the back pulley. It is characterized by being formed of at least one convex rib.

  According to said structure, since the 2nd latching | locking part is formed with the at least 1 convex-shaped rib fitted to the concave-shaped groove part provided in the outer peripheral surface of the back side pulley, a belt attachment jig | tool Can be accurately installed on the outer periphery of the rear pulley constituting the multi-stage pulley.

  When winding the belt between the base pulley and the multi-stage pulley having a plurality of pulleys including at least the front pulley and the rear pulley, the belt wound between the base pulley and the front pulley It is possible to provide a belt mounting jig that facilitates the work of shifting from the front pulley to the back pulley and that can more reliably wind the belt around the back pulley.

It is explanatory drawing of the two-stage hanging pulley and auxiliary machine pulley which are arrange | positioned at the housing | casing. It is the perspective view which looked at the belt attachment jig concerning this embodiment from a different direction. It is the perspective view which focused on the belt path of the belt attachment jig concerning this embodiment. It is a 6th page figure of the belt attachment jig concerning this embodiment. It is a 1st explanatory view of the usage method of the belt attachment jig concerning this embodiment. It is a 2nd explanatory view of the usage method of the belt attachment jig concerning this embodiment. It is a 3rd explanatory view of the usage method of the belt attachment jig concerning this embodiment. It is a 4th explanatory view of the usage method of the belt attachment jig concerning this embodiment. It is a 5th explanatory view of the usage method of the belt attachment jig concerning this embodiment. It is a 6th explanatory view of the usage method of the belt attachment jig concerning this embodiment. It is a 7th explanatory view of the usage method of the belt attachment jig concerning this embodiment. It is a 6th page figure of the belt attachment jig concerning other embodiments.

(Embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the belt attachment jig 9 according to the present embodiment includes a two-stage pulley 2 (multiple-stage pulley) in which a front pulley 21 and a rear pulley 22 are arranged in parallel in the central axis direction, and a complementary pulley. When the V-ribbed belt 4 that can be expanded and contracted in the circumferential direction is wound between the machine pulley 3 (base pulley), the belt wound between the auxiliary pulley 3 and the front pulley 21 is removed from the front pulley 21. Used to shift to the side pulley 22 (see FIG. 10).

  As shown in FIG. 1, the housing 1 is connected to a two-stage pulley 2 having a front pulley 21 and a rear pulley 22 connected to a crankshaft of an engine or the like, and an input shaft of an alternator. The auxiliary pulley 3 (base pulley) is rotatably supported with a predetermined inter-axis distance. Further, as shown in FIG. 1B, the front pulley 21 is disposed at a position shifted from the travel line of the V-ribbed belt 4 connecting the back pulley 22 and the auxiliary pulley 3 (offset position). The V-ribbed belt 4 is wound between the rear pulley 22 of the two-stage pulley 2 and the auxiliary pulley 3, so that the crankshaft power is supplied to the two-stage pulley 2, the V-ribbed belt 4, and the auxiliary pulley 3. It is transmitted to the input shaft of the alternator through the machine pulley 3 in order. In this embodiment, the inter-shaft distance between the two-stage pulley 2 and the auxiliary pulley 3 cannot be changed, and a so-called auto-tensioner (tension that applies tension to the V-ribbed belt 4 as shown in the drawing. Is not installed. Although not shown, another V-ribbed belt is wound between the pulley 21 on the front side of the two-stage pulley 2 and another pulley (not shown), so that the power of the crankshaft is also applied to the other pulleys. Can be transmitted.

(Configuration of two-stage pulley 2)
As shown in FIGS. 1 and 8, the two-stage pulley 2 is a pulley in which a front pulley 21 and a back pulley 22 having a slightly larger diameter than the front pulley 21 are arranged side by side in the central axis direction. It is. According to this, the front pulley 21 and the back pulley 22 can rotate in conjunction with each other around the central axis. Then, pulley grooves 21 a and 22 a (which can be fitted with a plurality of ribs formed in the circumferential direction on the inner peripheral surface of the V-ribbed belt 4 on the outer peripheral surfaces of the front pulley 21 and the rear pulley 22 in the two-stage pulley 2. Grooves) are formed respectively. 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. The pulley flange 2a is formed so as to slightly protrude from the pulley groove 21a in the radially outward direction of the front pulley 21 in a side view of FIG. The pulley flanges 2b and 2c are formed so as to slightly protrude from the pulley groove 22a in the radially outward direction of the rear pulley 22 in a side view of FIG. Further, a crankshaft (not shown) of the engine is inserted into the boss portion 5 of the two-stage pulley 2. Reference numeral 2 d indicates a side surface of the front pulley 21, and reference numeral 2 e indicates a side surface of the back pulley 22. When the V-ribbed belt 4 is wound around the front pulley 21, the side surface 2d of the front pulley 21 is used to lock the V-ribbed belt 4 hung across the outer periphery of the pulley flange 2a from the outer periphery of the front pulley 21. Two belt locking portions 6 are formed (see FIG. 5). As shown in FIG. 1A, the belt locking portion 6 has an elliptic cylinder shape. The V-ribbed belt 4 is a so-called low modulus belt that can be slightly expanded and contracted in the circumferential direction. The low modulus belt has a relatively low elastic modulus by using a polyamide fiber for the core, and a rapid drop in tension is suppressed as compared with a high elastic modulus belt (a so-called high modulus belt).

  A thick arrow V in FIG. 1A indicates the traveling direction of the V-ribbed belt 4, and the rotational direction of the two-stage pulley 2 when the V-ribbed belt 4 travels in this traveling direction is defined as the first rotational direction A. A direction opposite to the first rotation direction A is defined as a second rotation direction B.

(Configuration of belt mounting jig 9)
Next, the configuration of the belt mounting jig 9 according to the present embodiment will be described with reference to FIGS.

  As shown in FIGS. 2 to 4, the belt attaching jig 9 is provided on the main body 91 having a shape along the outer peripheral surfaces of the front pulley 21 and the rear pulley 22 and on the inner peripheral surface side of the main body 91. A plurality of convex ribs 92 (first locking portions) that fit into pulley grooves 21 a formed on the outer peripheral surface of the front pulley 21, and provided on the inner peripheral surface side of the main body 91, and the rear pulley 22 A convex rib 93 (second locking portion) that fits into the pulley groove 22a formed on the outer peripheral surface of the main body portion 91, a rear pulley side wall portion 95 provided on the outer peripheral surface side of the main body portion 91, and the main body portion 91. And a front pulley side wall 96 provided on the outer peripheral surface side of the main body.

  The main body 91 has a curved shape along the outer peripheral surfaces of the front pulley 21 and the rear pulley 22, and the rib 92, the rib 93, and the flange facing surface 94 are provided on the inner peripheral surface side of the main body 91. Is provided. As shown in FIGS. 2B and 2C, the flange facing surface 94 is inclined in accordance with the inclination of the pulley flange 2b so as to face the pulley flange 2b inclined from the front pulley 21 to the back pulley 22. Yes.

  As shown in FIGS. 2B and 2C, the rib 92 is constituted by six convex ribs on the inner peripheral surface of the main body 91 along the longitudinal direction. When the belt attachment jig 9 is attached to the two-stage pulley 2, the rib 92 fits into the pulley groove 21a of the front pulley 21 so that the belt attachment jig 9 is accurately fixed to the outer periphery of the front pulley 21. can do. In the present embodiment, the rib 92 is configured by six ribs in accordance with the number of pulley grooves 21a of the front pulley 21. However, in order to configure the rib 92, at least one convex rib is sufficient. Therefore, the rib 92 may be configured by a smaller number of ribs than the number of the pulley grooves 21a.

  As shown in FIGS. 2B and 2C, the rib 93 is configured by one convex rib on the inner peripheral surface of the main body 91 along the longitudinal direction. When the belt attachment jig 9 is attached to the two-stage pulley 2, the rib 93 fits into the pulley groove 22 a of the back pulley 22, so that the belt attachment jig 9 is accurately placed on the outer periphery of the back pulley 22. Can be fixed to. In the present embodiment, the rib 93 is constituted by one rib. However, since the rib 93 only needs to have at least one convex rib, the rib 93 includes a plurality of ribs 93 as in the case of the rib 92. You may comprise by this rib.

  As shown in FIGS. 2 to 4, the back pulley side wall 95 has a block shape having an inlet defining region 95 a and a back pulley surface region 95 b, and the outer pulley surface side of the outer peripheral surface of the main body 91. (Provided by the positional relationship when the belt attachment jig 9 is attached to the two-stage pulley 2).

  As shown in FIG. 2B, the inlet defining area 95a is an area of one end of the rear pulley side wall 95, and when viewed from the direction facing the inlet defining area 95a, It is inclined toward the rear pulley 22 so that the angle α formed with the inlet defining region 95a is 93 °. In the present embodiment, the formed angle α is set to 93 °. However, the formed angle α may be an obtuse angle, and may be in the range of 91 ° to 120 °. The reason why the angle α formed in this way is desired to be in the range of 91 ° to 120 ° is that when the formed angle α is smaller than 91 °, the V-ribbed belt 4 introduced from the outer peripheral surface of the front pulley 21 is used as the inlet. This is because the V-ribbed belt 4 is twisted at an angle of 90 ° or more when being brought into contact with the specified region 95a, and an excessive load is applied to the V-ribbed belt 4. On the other hand, when the formed angle α is larger than 120 °, when the V-ribbed belt 4 introduced from the outer peripheral surface of the front pulley 21 is brought into contact with the entrance defining area 95a, the V-ribbed belt 4 slides down from the entrance defining area 95a. Because it will end up. According to the entrance defining region 95a, the V-ribbed belt 4 is inclined at an angle of 87 ° by bringing the inner peripheral surface of the V-ribbed belt 4 introduced from the outer peripheral surface of the front pulley 21 into contact with the entrance defining region 95a ( Can be twisted).

  As shown in FIG. 3, the rear pulley surface region 95b has an angle γ formed by the outer peripheral surface of the main body 91 and the rear pulley surface region 95b of 93 ° when viewed from the direction facing the inlet defining region 95a. Inclined toward the rear pulley 22 side. In the present embodiment, the angle γ is set to 93 ° in the same manner as the angle α forming the angle γ, but the angle γ formed may be an obtuse angle similarly to the entrance defining region 95a, and moreover in the range of 91 ° to 120 °. If it is in. The rear pulley surface region 95b plays a role of guiding the V-ribbed belt 4 to an outlet defining region 96a described later by facing the inner peripheral surface of the V-ribbed belt 4 inclined by the inlet defining region 95a.

  As shown in FIGS. 2 to 4, the front pulley side wall portion 96 has a block shape having a front pulley surface region 96 b and an outlet defining region 96 a, and the front pulley 21 side (belt attachment) of the outer peripheral surface of the main body portion 91. The jig 9 is provided so as to protrude in a positional relationship when the jig 9 is attached to the two-stage pulley 2.

  As shown in FIG. 3, the front pulley surface region 96b has an angle θ formed by the outer peripheral surface of the main body 91 and the front pulley surface region 96b of 87 ° when viewed from the direction facing the inlet defining region 95a. It is inclined to the back pulley 22 side. In the present embodiment, the formed angle θ is set to 87 °. However, the formed angle θ may be an acute angle and may be in the range of 60 ° to 89 °. As shown in FIG. 3, since it is desirable that the rear pulley surface region 95b and the front pulley surface region 96b are in a parallel relationship, it is preferable that γ + θ = 180 °. The front pulley surface region 96b plays a role of guiding the V-ribbed belt 4 to an outlet defining region 96a described later by facing the outer peripheral surface of the V-ribbed belt 4 inclined by the inlet defining region 95a.

  As shown in FIG. 2C, the outlet defining region 96a is a region at one end of the front pulley side wall 96, and when viewed from the direction facing the outlet defining region 96a, the outer peripheral surface of the main body 91 and the outlet It is inclined toward the rear pulley 22 so that the angle β formed with the defined region 96a is 87 °. In the present embodiment, the formed angle β is set to 87 °. However, the formed angle β may be an acute angle and may be in the range of 60 ° to 89 °. In addition, since it is desirable that the inlet defining area 95a and the outlet defining area 96a are in a parallel relationship (see FIG. 3), it is preferable that α + β = 180 °. According to the outlet defining region 96a, the V-ribbed belt 4 guided by the belt path 97 (see FIG. 3) surrounded by the front pulley surface region 96b, the outer peripheral surface of the main body 91, and the back pulley surface region 95b. Can be inclined (twisted) again along the outer peripheral surface of the rear pulley 22 by bringing the outer peripheral surface into contact with the outlet defining region 96a.

  As shown in FIG. 2D, the belt passage 97 is inclined in the direction in which the rear pulley 22 is disposed from the inlet defining region 95a to the outlet defining region 96a. This inclination angle is defined by an angle ε formed by the side surface 2e of the back pulley 22 and the belt passage 97 (see FIG. 2D). In the present embodiment, the angle ε is set to 16 °. It is desirable that the angle ε formed is in the range of 15 ° to 60 °. The reason is that when the formed angle ε is smaller than 15 °, the belt passage 97 becomes long and the longitudinal width of the belt mounting jig 9 is increased. This is because it lacks compactness. On the other hand, when the formed angle ε is larger than 60 °, the inclination from the inlet defining region 95a to the outlet defining region 96a becomes large. Therefore, when the V-ribbed belt 4 is introduced into the belt passage 97, the inlet defining region 95a This is because an excessive load may be applied to the V-ribbed belt 4 in contact with the outlet defining region 96a.

  Further, the width of the belt passage 97 (a portion sandwiched between the rear pulley surface region 95b and the front pulley surface region 96b) is set slightly larger than the side width of the V-ribbed belt 4 (thickness of the V-ribbed belt 4). Has been.

(How to use the belt mounting jig 9)
Next, the usage method of said belt attachment jig 9 is demonstrated, referring FIGS. Specifically, first, a procedure for winding the V-ribbed belt 4 between the auxiliary pulley 3 and the front pulley 21 of the two-stage pulley 2 will be described, and then the V-ribbed belt 4 wound around the front pulley 21 A procedure for shifting to the rear pulley 22 using the belt mounting jig 9 will be described.

  Although not shown, a wrench is connected to the boss portion 5 of the two-stage pulley 2 so that the two-stage pulley 2 can be manually rotated freely.

<Procedure (a)>
First, the two-stage pulley 2 is rotated by turning the wrench so that the V-ribbed belt 4 can be easily hung on the belt locking portion 6 of the two-stage pulley 2. Then, as shown in FIG. 5, the V-ribbed belt 4 is wound around the auxiliary pulley 3, and the V-ribbed belt 4 is extended from the outer periphery of the front pulley 21 of the two-stage pulley 2 to the belt locking portion 6 across the pulley flange 2a. Lock it so that it is in the hooked state.

<Procedure (b)>
Next, as shown in FIG. 6, the two-stage pulley 2 is rotated in the first rotation direction A by turning the wrench. When the two-stage pulley 2 is further rotated in the first rotational direction A, the belt locking portion 6 pushes out the V-ribbed belt 4 and the V-ribbed belt 4 is wound on the outer periphery of the front pulley 21. It becomes a state. That is, as shown in FIGS. 7 and 8, the V-ribbed belt 4 hung and locked on the belt locking portion 6 leaves the belt locking portion 6 by its own tension, and onto the outer periphery of the front pulley 21. And move spontaneously. In this way, as shown in FIG. 8, the V-ribbed belt 4 is wound between the auxiliary pulley 3 and the front pulley 21.

  In the present embodiment, a description will be given of a case where the belt locking portion 6 provided on the side surface 2d of the two-stage pulley 2 is used when the V-ribbed belt 4 is wound between the auxiliary pulley 3 and the front pulley 21. However, the present invention is not limited to this, and when the V-ribbed belt 4 is wound between the auxiliary pulley 3 and the front pulley 21, a belt attachment used for winding the V-ribbed belt 4 between general one-stage pulleys. A jig may be used (for example, a belt mounting jig disclosed in JP 2011-208753 A).

<Procedure (c)>
Next, a procedure for shifting the V-ribbed belt 4 wound between the auxiliary machine pulley 3 and the front pulley 21 from the front pulley 21 to the back pulley 22 using the belt mounting jig 9 will be described.

  First, as shown in FIG. 9A, the belt attachment jig 9 is held in hand, and the belt passage 97 of the belt attachment jig 9 held in the hand is wound between the auxiliary pulley 3 and the front pulley 21. It is made to be in a state of being opposed to the side surface of the hung V-ribbed belt 4 (see the broken-line belt attaching jig 9 in FIG. 9A). Then, the belt attachment jig 9 is moved in the direction of the arrow, and the belt passage 97 of the belt attachment jig 9 is sandwiched between the side surfaces of the V-ribbed belt 4 (see the belt attachment jig 9 indicated by the solid line in FIG. 9A). At this time, the V-ribbed belt 4 is sandwiched between the rear pulley surface region 95b and the front pulley surface region 96b. Further, the rear pulley surface region 95b and the back surface side (the side where the ribs are provided) of the V-ribbed belt 4 face each other. Further, the front pulley surface region 96b and the front side of the V-ribbed belt 4 face each other.

  Next, as shown in FIG. 9 (b), with the V-ribbed belt 4 sandwiched between the belt passages 97 of the belt mounting jig 9, the longitudinal direction of the belt mounting jig 9 is used as the rotation axis from the front to the back. (See the rotation direction K in FIG. 9B).

  When the belt mounting jig 9 is rotated 90 ° as described above, the inner peripheral surface (surface on which the rib is provided) of the V-ribbed belt 4 comes into contact with the inlet defining region 95a as shown in FIG. 9C. Thus, the V-ribbed belt 4 is an angle of 87 ° which is the inclination angle (180 ° −93 ° (the formed angle α)) of the entrance defining region 95a with reference to the V-ribbed belt 4 on the outer peripheral surface of the front pulley 21. It becomes the state of being inclined (twisted). Similarly, when the outer peripheral surface of the V-ribbed belt 4 abuts the outlet defining region 96a, the V-ribbed belt 4 is inclined with respect to the V-ribbed belt 4 on the outer peripheral surface of the front pulley 21 (see FIG. It is in a state of being inclined (twisted) at an angle of 87 ° which is an angle β). Further, the rib 92 of the belt attachment jig 9 has a positional relationship facing the pulley groove 21 a provided on the outer peripheral surface of the front pulley 21. Further, the rib 93 of the belt attachment jig 9 is also in a positional relationship facing the pulley groove 22 a provided on the outer peripheral surface of the back pulley 22.

<Procedure (d)>
Next, as shown in FIG. 10A, the belt mounting jig 9 is moved to the outer peripheral surface of the two-stage pulley 2 while rotating the two-stage pulley 2 in the first rotation direction A by turning the wrench. (See FIG. 11 (1)). Thereby, the rib 92 of the belt attachment jig 9 is in a state of being fitted into the pulley groove 21 a provided on the outer peripheral surface of the front pulley 21. Similarly, the rib 93 of the belt attachment jig 9 is also fitted in a pulley groove 22 a provided on the outer peripheral surface of the rear pulley 22. As a result, the belt attaching jig 9 is fitted with the rib 92 and the pulley groove 21a of the front pulley 21, the fitting of the rib 93 and the pulley groove 22a of the back pulley 22, and the tension of the V-ribbed belt 4. It is fixed on the outer periphery of the two-stage hanging pulley 2.

  Next, the wrench is rotated with the belt attachment jig 9 fixed on the outer periphery of the two-stage pulley 2 to further rotate the two-stage pulley 2 in the first rotation direction A (FIG. 11 (2) ( 3)). Then, as shown in FIG. 10B, the V-ribbed belt 4 introduced from the outer peripheral surface of the front pulley 21 into the belt passage 97 of the belt mounting jig 9 moves along the outer peripheral surface of the rear pulley 22. . More specifically, the V-ribbed belt 4 introduced from the outer peripheral surface of the front pulley 21 is inclined by the inlet defining region 95a, and the inclined V-ribbed belt 4 is guided by the belt passage 97, and further, the outlet defining region It is made to incline again by 96a and is moved along the outer peripheral surface of the back pulley 22.

  Further, the two-stage pulley 2 is rotated in the first rotation direction A. Then, the V-ribbed belt 4 naturally moves away from the belt path 97 and moves to the outer periphery of the two-stage pulley 2 (see FIG. 11 (4)). After this movement, the belt mounting jig 9 is recovered from the outer periphery of the two-stage pulley 2.

  According to the above procedure, the V-ribbed belt 4 wound between the auxiliary machine pulley 3 and the front pulley 21 can be shifted to a state wound between the auxiliary machine pulley 3 and the rear pulley 22. it can.

  As described above, according to the belt mounting jig 9 according to the present embodiment, the main body 91 has a shape along the outer periphery of the two-stage pulley 2, and the main body is formed on the outer peripheral surface of the front pulley 21. Since the rib 92 for locking the inner peripheral surface of 91 and the rib 93 for locking the inner peripheral surface of the main body 91 on the outer peripheral surface of the rear pulley 22 are provided, the belt mounting jig 9 can be The front pulley 21 and the rear pulley 22 constituting the hanging pulley 2 can be reliably installed along the outer periphery.

Further, when the V-ribbed belt 4 wound between the auxiliary machine pulley 3 and the front pulley 21 is shifted from the front pulley 21 to the back pulley 22, along the outer circumferences of the front pulley 21 and the back pulley 22 By installing the belt attachment jig 9, the V-ribbed belt 4 introduced from the outer peripheral surface of the front pulley 21 is inclined at the entrance regulation region 95 a of the rear pulley side wall portion 95, and the inclined V-ribbed belt 4 is Guided by a belt passage 97 sandwiched between the pulley surface region 96b and the back pulley surface region 95b, the guided V-ribbed belt 4 is inclined again by the outlet defining region 96a so as to follow the outer peripheral surface of the back pulley 22. It can be easily transferred.
In addition, when the V-ribbed belt 4 is shifted from the front pulley 21 to the rear pulley 22, the V-ribbed belt 4 is held by using the inlet defining area 95a and the outlet defining area 96a that incline the V-ribbed belt 4 as support portions (fulcrums). Therefore, it is possible to prevent the V-ribbed belt 4 from slipping or sliding in the direction of the front pulley 21 or the back pulley 22 and the V-ribbed belt 4 being detached from the belt attachment jig 9.
Further, by guiding the V-ribbed belt 4 introduced into the belt passage 97 sandwiched between the front pulley surface region 96b and the back pulley surface region 95b, the V-ribbed belt 4 is smoothly transferred from the front pulley 21 to the back pulley 22. Can be shifted.

  Further, according to the above configuration, when the V-ribbed belt 4 is inclined in the inlet defining area 95a and the outlet defining area 96a, the inclination of the V-ribbed belt 4 can be maintained at an angle smaller than 90 °. In other words, the V-ribbed belt 4 can be shifted from the front pulley 21 to the back pulley 22 without being tilted more than 90 ° (without being twisted). According to this, the V-ribbed belt 4 can be smoothly introduced from the front pulley 21 into the inlet defining area 95a without excessive stress due to the inclination to the V-ribbed belt 4, and the V-ribbed belt 4 can be smoothly introduced into the outlet defining area 96a. To the rear pulley 22.

  Further, according to the above configuration, when the V-ribbed belt 4 is guided by the belt passage 97 formed by the front pulley surface region 96b and the back pulley surface region 95b, the V-ribbed belt 4 is set at an angle smaller than 90 °. It can be tilted and guided. That is, the V-ribbed belt 4 can be guided from the inlet defining area 95a to the outlet defining area 96a via the belt passage 97 without being inclined more than 90 °. According to this, the V-ribbed belt 4 can be smoothly guided from the entrance defining region 95a to the exit defining region 96a without applying excessive stress due to the inclination to the V-ribbed belt 4.

  Further, according to the above configuration, when the front pulley 21 is at a position that is offset from the travel line of the V-ribbed belt 4 that connects the back pulley 22 and the auxiliary pulley 3, the auxiliary pulley 3 and the front pulley 21. The V-ribbed belt 4 that has been wound between and in an offset state is passed through a belt passage 97 that is inclined in the direction toward the rear pulley 22 from the inlet defining region 95a to the outlet defining region 96a. Thus, the V-ribbed belt 4 can be shifted from the front pulley 21 to the back pulley 22 while the offset state is smoothly eliminated.

  Moreover, according to said structure, by making the angle | corner (epsilon) which the side surface 2e of the back side pulley 22 and the belt path 97 make into the range of 15 degrees-60 degrees, with respect to V ribed belt 4, maintaining compactness. Excessive load can be prevented.

  Moreover, according to said structure, the rib 92 as a 1st latching | locking part is an at least 1 or more convex rib which fits into the concave pulley groove 21a provided in the outer peripheral surface of the near pulley 21. Since it is formed, the belt attachment jig 9 can be accurately installed on the outer periphery of the front pulley 21 constituting the two-stage pulley 2.

  Moreover, according to said structure, the rib 93 as a 2nd latching | locking part fits into the concave pulley groove 22a provided in the outer peripheral surface of the back side pulley 22, At least 1 or more convex rib Therefore, the belt attachment jig 9 can be accurately installed on the outer periphery of the back pulley 22 constituting the two-stage pulley 2.

(Other embodiments)
In the belt mounting jig 9 in the above embodiment, the rear pulley side wall 95 and the front pulley side wall 96 have a thickness in the short direction of the belt mounting jig 9 as shown in FIG. However, the present invention is not limited to this, and the rear pulley side wall portion 95 and the front pulley side wall portion 96 may have a shape in which the thickness in the short direction is reduced. For example, like the belt attachment jig 109 shown in FIG. 12, there is a structure in which the back pulley side wall portion 195 and the front pulley side wall portion 196 are formed in a plate shape to reduce the thickness. According to this, the belt attachment jig 109 itself can be made compact and light.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims.

DESCRIPTION OF SYMBOLS 1 Case 2 Two-stage pulley 21 Front pulley 21a Pulley groove 22 Back pulley 22a Pulley groove 3 Auxiliary pulley 4 V-ribbed belt 9 Belt attachment jig 91 Main body portion 92 Rib 93 Rib 94 Flange facing surface 95 Back pulley side wall portion 95a Inlet defining area 95b Rear pulley surface area 96 Front pulley side wall 96a Outlet defining area 96b Front pulley surface area 97 Belt passage A First rotation direction

Claims (7)

When a plurality of pulleys including at least the front pulley and the rear pulley are wound around a belt that can be expanded and contracted in the circumferential direction between a plurality of stepped pulleys arranged in parallel in the central axis direction 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 having a shape along the outer peripheral surface of the multi-stage pulley;
A first locking portion that is provided on the inner peripheral surface side of the main body portion and locks the inner peripheral surface of the main body portion to the outer peripheral surface of the front pulley;
A second locking portion that is provided on the inner peripheral surface side of the main body portion and locks the inner peripheral surface of the main body portion on the outer peripheral surface of the rear pulley;
It is provided on the outer peripheral surface side of the main body, and is opposed to an inlet defining region for inclining the belt introduced from the outer peripheral surface of the front pulley, and one surface of the belt inclined by the inlet defining region. A back pulley side wall portion having a back pulley surface region for guiding the belt by
A front pulley surface region that guides the belt by facing the other surface of the belt that is provided on the outer peripheral surface side of the main body portion and is inclined by the inlet defining region, and the front pulley surface region and the back surface A front pulley side wall having an outlet defining region for inclining the belt guided by the belt path formed by the side pulley surface region again along the outer peripheral surface of the back pulley;
A belt mounting jig comprising:   The inlet defining region is inclined toward the back pulley so that an angle formed between the outer peripheral surface of the main body and the inlet defining region is an obtuse angle when viewed from the direction facing the inlet defining region, The outlet defining region is inclined toward the back pulley so that an angle formed by the outer peripheral surface of the main body and the outlet defining region is an acute angle when viewed from a direction facing the outlet defining region. The belt attachment jig according to claim 1.   The back pulley surface region is inclined in the back pulley direction so that an angle formed by the outer peripheral surface of the main body and the back pulley surface region is an obtuse angle when viewed from the direction facing the inlet defining region. The front pulley surface region is arranged in the rear pulley direction so that an angle formed between the outer peripheral surface of the main body and the front pulley surface region is an acute angle when viewed from the direction facing the inlet defining region. The belt mounting jig according to claim 1, wherein the belt mounting jig is inclined.   2. The belt path formed by the front pulley surface region and the back pulley surface region is inclined toward the back pulley from the inlet defining region to the outlet defining region. The belt attachment jig in any one of -3.   The belt attachment jig according to claim 4, wherein the belt passage is formed with an angle formed between a side surface of the back pulley and the belt passage in a range of 15 ° to 60 °.   The said 1st latching | locking part is formed with the at least 1 convex-shaped rib fitted to the concave-shaped groove part provided in the outer peripheral surface of the said near pulley, The any one of Claims 1-5 characterized by the above-mentioned. The belt mounting jig according to the above.   The said 2nd latching | locking part is formed of the at least 1 convex-shaped rib fitted to the concave-shaped groove part provided in the outer peripheral surface of the said back side pulley. The belt mounting jig according to any one of the above.

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