JP2011208753A - Belt mounting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the structure of a belt mounting tool installed to an outer periphery of a first pulley for use simple and compact and to provide an improved and easy-to-use belt mounting tool, in winding an extensible belt between the first pulley and a second pulley with a distance between shafts thereof fixed.SOLUTION: The belt mounting tool 9 includes: a pulley pressed part 10 disposed on an outer periphery of a crank pulley 2, and pressed by a tensile force of a V-ribbed belt 4 crossing over a pulley flange 2b from a side face 2c of the crank pulley 2 and introduced to the outer periphery of the crank pulley 2; and a bending guide part 11 disposed to a side face 10a of the pulley pressed part 10, and bending the V-ribbed belt 4 to be extended along the outer periphery of the crank pulley 2, in which the V-ribbed belt 4 intersects with a surface of the pulley pressed part 10 from the side face 2c of the crank pulley 2 and introduced to the outer periphery of the crank pulley 2; and a rib 12 disposed to a back face of the pulley pressed part 10 and fitted in a pulley groove 2a disposed to an outer peripheral face of the crank pulley 2.

Description

  The present invention relates to a belt mounting jig. Specifically, the present invention relates to a technique for winding a belt between a first pulley and a second 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. Tension is applied.

  As described above, the operation of winding the belt having the belt circumference shorter than the layout circumference between the pulleys around the pulley may be troublesome. In order to reduce this effort, Patent Document 1 discloses a jig that assists the work of extending the belt in the circumferential direction and winding the belt around the outer periphery of the pulley.

  Specifically, Patent Document 1 includes a sandwiching portion that is sandwiched between a pulley and a belt, and a stopper that prevents the belt from coming off in the width direction. A belt attaching and detaching jig having a surface formed therein is disclosed. The inclined surface on the surface of the sandwiching portion is provided to facilitate removal of the belt from the pulley by sliding the belt in the pulley axial direction on the surface of the sandwiching portion. In addition, the guide surface provided on the surface of the sandwiching portion has a curved surface, and is provided to smoothly slide the surface of the sandwiching portion when the belt is attached.

JP 2009-115150 A

  However, in the configuration of Patent Document 1, in order to secure a region (thickness of the sandwiched portion) for forming the inclined surface and the guide surface on the sandwiched portion surface, it is necessary to increase the thickness of the sandwiched portion, No more compact.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a belt that can be expanded and contracted in the circumferential direction between the first pulley and the second pulley. A belt mounting jig that is installed on the outer periphery of the first pulley and used for winding with the shaft-to-shaft distance between the pulley and the second pulley fixed, has a simple and compact structure, and is easy to use It is to improve.

1st invention for solving the said subject fixed the interaxial distance of said 1st pulley and said 2nd pulley between the 1st pulley and the 2nd pulley with the belt which can be expanded-contracted in the circumferential direction. A belt mounting jig that is installed on the outer periphery of the first pulley and used on the outer periphery of the first pulley, and is disposed on the outer periphery of the first pulley, and is applied to the outer periphery of the first pulley by the tension of the belt. A pulley pressing portion that is pressed and a side surface of the pulley pressing portion that bends the belt introduced to the outer periphery of the first pulley across the edge from the side surface of the first pulley and the first pulley A bend guide portion for following the outer periphery of the pulley, a fitting portion provided on the back surface of the pulley pressing portion, and fitted in a groove provided on the outer peripheral surface of the first pulley,
It is characterized by having.

  The belt mounting jig is used as follows. First, the fitting portion provided on the back surface of the pulley pressing portion is fitted into the groove provided on the outer peripheral surface of the first pulley so that the side surface on which the bending guide portion is provided is in front. In this state, the belt is wound around the second pulley, and is bent over the edge of the first pulley from the side surface of the first pulley and bent at the bending guide portion, and then on the pulley pressing portion. Are crossed along the outer periphery of the first pulley. Next, the first pulley is rotated with the side of the bending guide portion where the belt is bent as a rotation direction. Then, a high tension is generated in the belt by being stretched. The tension acts as a pressing action for pressing the pulley pressing portion against the outer periphery of the first pulley because the belt intersects the pulley pressing portion, and the tension provided on the back surface of the pulley pressing portion. The fitting between the fitting portion and the groove provided on the outer peripheral surface of the first pulley is further strengthened. When the first pulley is continuously rotated in the same direction, the belt on the side surface of the first pulley moves over the edge of the first pulley and moves onto the pulley pressing portion. The belt on the pressing portion leaves the pulley pressing portion and moves to the outer periphery of the first pulley. After this movement, the belt mounting jig is recovered from the outer periphery of the first pulley.

  Here, the belt mounting jig according to the present invention functions as a pressing action for pressing the pulley pressing portion against the outer periphery of the first pulley because the belt intersects the pulley pressing portion, and the pulley The fitting between the fitting portion provided on the back surface of the pressing portion and the groove provided on the outer peripheral surface of the first pulley is further strengthened.

  Further, the belt mounting jig according to the present invention (hereinafter also referred to as the present jig) is compared with the belt mounting and detaching jig disclosed in Patent Document 1 (hereinafter also referred to as the reference jig 1). The tool does not have an inclined surface on the surface of the clamping part of the reference jig 1. However, the inclined surface of the clamping part surface of the reference jig 1 plays a role of removing the belt from the pulley by sliding the belt in the pulley axial direction of the clamping part surface when removing the belt from the pulley. Its use is different from that of ingredients. The jig of the present application does not have a guide surface on the surface of the clamping part of the reference jig 1. However, the guide surface provided on the surface of the clamping part of the reference jig 1 plays a role of smoothly sliding the belt onto the surface of the clamping part and guiding it to the surface of the clamping part when attaching the belt. In the tool, the bending guide portion provided on the side surface of the pulley pressing portion plays the same role. Therefore, it is not necessary for the jig of the present application to secure a region for forming the inclined surface and the guide surface on the surface of the pulley pressing portion (the thickness of the pulley pressing portion), and to make the pulley pressing portion thin and to have a compact configuration. Can do.

  According to a second aspect of the present invention, in the belt mounting jig according to the first aspect, the bending guide portion provided on the side surface of the pulley pressing portion has at least a portion for bending the belt on the pulley pressing portion. It is characterized by being overhanging and L-shaped.

  According to the above configuration, since the bending guide portion has at least a portion where the belt is bent overhangs the pulley pressing portion and has an L shape, the strength of the bending guide portion can be increased. Thereby, it is possible to sufficiently withstand the belt tension applied to the bending guide portion.

  Further, a third aspect of the present invention is the side face of the pulley pressing portion of the belt mounting jig according to the first or second aspect, wherein the bending guide portion is provided on the side where the belt is introduced into the outer periphery of the first pulley. And a contact portion that is the same side surface as the side surface on which the bending guide portion is provided and that contacts the side surface of the first pulley at least on the side opposite to the side on which the bending guide portion is provided. It is a feature.

  According to said structure, by providing the contact part contact | abutted to the side surface of said 1st pulley, the attitude | position of the belt attachment jig | tool on the outer periphery of said 1st pulley is stabilized further, Therefore, with the tension | tensile_strength of a belt It can suppress that a belt attachment jig remove | deviates from the outer periphery of a 1st pulley. In addition, since the contact portion is positioned at the edge portion of the first pulley over which the belt straddles in a state where the contact portion is in contact with the side surface of the first pulley, Contact with the rim can be prevented, thereby preventing damage to the belt.

  Moreover, 4th invention is the belt attachment jig | tool which concerns on either of 1st-3rd invention, The said fitting part is the same number as the number of the grooves provided in the outer peripheral surface of said 1st pulley. It is characterized by being a rib.

  According to said structure, it is provided in the outer peripheral surface of a 1st pulley by providing the same number of ribs as the number of the grooves provided in the outer peripheral surface of a 1st pulley as a fitting part in the back surface of a pulley press part. The groove and the same number of ribs as the groove can be fitted more firmly. As a result, the posture of the belt attachment jig on the outer periphery of the first pulley is further stabilized, so that the belt attachment jig can be prevented from being detached from the outer periphery of the first pulley due to the belt tension.

  According to a fifth aspect of the invention, in the belt mounting jig according to the third aspect of the invention, the fitting portion is a single rib.

  In said structure, only one rib is provided as a fitting part in the back surface of a pulley press part. According to this, the structure of the belt mounting jig can be simplified and made more compact. Although it seems that the posture of the belt mounting jig on the outer periphery of the first pulley may become unstable, holding the first pulley between this one rib and the abutting part will The posture of the belt mounting jig is stabilized.

  Further, a sixth invention is the belt mounting jig according to any one of the first to fifth inventions, wherein the pulley pressing portion has a shape along the belt along the bending guide portion. It is a feature.

  In the above configuration, the pulley pressing portion has a shape in which the belt is placed along the bending guide portion, so that the pulley pressing portion can have a minimum necessary compact structure. Further, by reducing the surface area of the pulley pressing portion, it is possible to increase the pressing force per unit area where the belt presses the pulley pressing portion against the outer periphery of the first pulley. As a result, the posture of the belt mounting jig on the outer periphery of the first pulley is further stabilized, so that the belt mounting jig can be prevented from being detached from the outer periphery of the first pulley due to the belt tension.

  Installed on the outer circumference of the first pulley when winding a belt that can be expanded and contracted in the circumferential direction between the first pulley and the second pulley while the distance between the axes of the first pulley and the second pulley is fixed. Thus, the belt mounting jig to be used can be improved to a simple and compact structure and easy to use.

It is a fragmentary perspective view of the engine body concerning a 1st embodiment. It is sectional drawing of the crank pulley which concerns on 1st Embodiment. It is a perspective view of the belt attachment jig concerning a 1st embodiment. It is a 6th page figure of the belt attachment jig concerning a 1st embodiment. (A) is an enlarged view of FIG. 3 (a), (b) is an enlarged view of FIG.3 (c). It is a 1st explanatory view of the usage method of the belt attachment jig concerning a 1st embodiment. It is a 2nd explanatory view of the usage method of the belt attachment jig concerning a 1st embodiment. It is a 3rd explanatory view of the usage method of the belt attachment jig concerning a 1st embodiment. It is a 4th explanatory view of the usage method of the belt attachment jig concerning a 1st embodiment. It is a perspective view of the belt attachment jig which concerns on 2nd Embodiment. It is a 6th page figure of the belt attachment jig concerning a 2nd embodiment.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. The belt attachment jig according to the present embodiment is used to wrap the V-ribbed belt 4 between the crank pulley 2 and the alternator pulley 3 of the alternator. First, the winding of the V-ribbed belt 4 around the crank pulley 2 and the alternator pulley 3 will be described with reference to FIG. 1, and the structure of the crank pulley 2 will be described with reference to FIG.

  As shown in FIG. 1, the engine body 1 includes a crank pulley 2 (first pulley) connected to the crankshaft of the engine, an alternator pulley 3 (second pulley) connected to the input shaft of the alternator, Are supported rotatably with a predetermined distance between the axes. A V-ribbed belt 4 indicated by a solid line and a broken line is wound between the crank pulley 2 and the alternator pulley 3 so that the power of the crankshaft passes through the crank pulley 2, the V-ribbed belt 4, and the alternator pulley 3 in this order. It is transmitted to the input shaft of the alternator. In the present embodiment, the inter-shaft distance between the crank pulley 2 and the alternator pulley 3 cannot be changed, and as shown in the drawing, a so-called auto tensioner (tension applying means) that applies tension to the V-ribbed belt 4. Is not installed.

(Crank pulley structure)
As shown in FIG. 2, the crank pulley 2 has five pulley grooves 2 a that can be fitted to ribs 4 a formed on the inner periphery of the V-ribbed belt 4, and sandwiches the five pulley grooves 2 a in the pulley axial direction. A pair of pulley flanges 2b (edges of the first pulley) are provided. The pulley flange 2b is formed so as to slightly protrude outwardly in the pulley radial direction from the pulley groove 2a in the sectional view of FIG. A crankshaft (not shown) of the engine is inserted into the boss portion 5 of the crank pulley 2. Reference numeral 2 c indicates a side surface of the crank pulley 2. 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).

  1 indicates the travel direction of the V-ribbed belt 4, and the rotation direction of the crank pulley 2 when the V-ribbed belt 4 travels in this travel direction is defined as the first rotation direction A and the first rotation direction A. The opposite direction is defined as the 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. FIG. 3 is a perspective view of the belt mounting jig 9 according to the first embodiment of the present invention. 3A to 3D are perspective views of the belt attachment jig 9 as seen from different directions. FIG. 4 is a six-sided view of the belt mounting jig 9 according to the first embodiment of the present invention. 5 (a) is an enlarged view of FIG. 3 (a), and FIG. 5 (b) is an enlarged view of FIG. 3 (c).

  3 to 4, the belt mounting jig 9 which is compact and well-organized and is integrally formed is drawn from various directions.

  As shown in FIG. 5, the belt attachment jig 9 includes a pulley pressing portion 10, a rib 12 (fitting portion) provided on the back surface of the pulley pressing portion 10, and a bending guide portion 11 as main components. . The belt attachment jig 9 further includes a contact portion 15. The belt attachment jig 9 is substantially equal to the width of the crank pulley 2 and is used in contact with the outer periphery of the crank pulley 2, and the bending guide portion 11 and the contact portion 15 are shown in FIG. The direction is determined so as to be positioned above the side surface 2c of the.

  As shown in FIG. 6, the pulley pressing portion 10 covers the pulley groove 2 a (outer periphery) in a state where the belt attachment jig 9 is in contact with the outer periphery of the crank pulley 2. The pulley pressing portion 10 is curved in an arc shape along the pulley groove 2 a of the crank pulley 2 and has a width of at least the belt width 4 w of the V-ribbed belt 4.

  On the back side of the pulley pressing portion 10, five ribs 12 that can be fitted into the five pulley grooves 2 a of the crank pulley 2 are formed. In the present embodiment, the number of ribs 12 is five, which is the same number as the five pulley grooves 2 a provided on the outer peripheral surface of the crank pulley 2.

  On the side surface of the pulley pressing portion 10, the outer periphery of the crank pulley 2 is bent by bending a V-ribbed belt 4 introduced to the outer periphery of the crank pulley 2 across the side surface 2 c of the crank pulley 2 and the pulley flange 2 b (the edge of the first pulley). A bending guide portion 11 is provided for the purpose of following the above. The bending guide portion 11 is disposed on the side where the V-ribbed belt 4 is introduced to the outer periphery of the crank pulley 2, that is, on the second rotation direction B side of the side surface 10 a of the pulley pressing portion 10. Further, the bending guide portion 11 has a curved surface 11 a for bending the V-ribbed belt 4 introduced into the crank pulley 2 along the surface of the pulley pressing portion 10 so as to be along the pulley groove 2 a of the crank pulley 2. . Further, the curved guide portion 11 has a curved surface 11a protruding on the surface of the pulley pressing portion 10 and has an L shape in plan view. Further, the curved surface 11 a extends outward in the radial direction of the crank pulley 2 at least longer than the belt width 4 w of the V-ribbed belt 4.

  A contact portion 15 that contacts the side surface 2 c of the crank pulley 2 is provided on the side surface 10 a of the pulley pressing portion 10. When the five ribs 12 of the pulley pressing portion 10 are fitted in the five pulley grooves 2a of the crank pulley 2, the contact portion 15 contacts or closely contacts the side surface 2c of the crank pulley 2 shown in FIG. As shown in FIG. 5 (b), the pulley pressing portion 10 extends from the side surface 10 a toward the axis of the crank pulley 2. The abutting portion 15 is chamfered at the edge that contacts the V-ribbed belt 4 and has a curved shape. This is provided so as not to damage the V-ribbed belt 4 during winding. In addition, the contact part 15 should just be provided in the side surface area on the opposite side to the side which provided the bending | flexion guide part 11 at the side surface same as the side surface 10a which provided the bending | flexion guide part 11. FIG. That is, in the state where the belt attaching jig 9 is disposed on the outer periphery of the crank pulley 2 and the contact portion 15 is in contact with the side surface 2c of the crank pulley 2, the contact portion 15 is connected to the pulley flange 2b over which the V-ribbed belt 4 straddles. What is necessary is just to be arrange | positioned at the part.

(How to use the belt mounting jig)
Next, the usage method of said belt attachment jig 9 is demonstrated, referring FIGS. FIG. 6 is a first explanatory view of a method for using the belt mounting jig 9. FIG. 7 is a second explanatory view of the method of using the belt mounting jig 9. FIG. 8 is a third explanatory view of the method of using the belt mounting jig 9. FIG. 9 is a fourth explanatory view of the method of using the belt attachment jig 9.

  First, as shown in FIG. 6, a cylindrical connecting portion 17a of a wrench 17 is connected to the boss portion 5 of the crank pulley 2 so that the crank pulley 2 can be freely rotated manually.

<Procedure (a)>
Next, the rib 12 provided on the back surface of the pulley pressing portion 10 so that the side surface 10 a where the bending guide portion 11 and the contact portion 15 of the belt mounting jig 9 are provided contacts the side surface 2 c of the crank pulley 2. Is fitted in a pulley groove 2 a provided on the outer peripheral surface of the crank pulley 2.

<Procedure (b)>
In this state, as shown in FIG. 6, the V-ribbed belt 4 is wound around the alternator pulley 3, and the bending guide portion 11 spans the contact portion 15 covering the pulley flange 2 b from the side surface 2 c of the crank pulley 2. After being bent, the pulley pressing portion 10 is crossed so as to be along the outer periphery of the crank pulley 2.

  In detail, the V-ribbed belt 4 wound around the alternator pulley 3 is sequentially arranged in the direction opposite to the moving direction of the V-ribbed belt 4, that is, the connecting portion 17 a of the wrench 17, the belt mounting jig 9, and the pulley groove 2 a of the crank pulley 2. Is wound in this order. That is, the V-ribbed belt 4 is first wound around the connecting portion 17 a of the wrench 17. The twist of the V-ribbed belt 4 between the alternator pulley 3 and the connecting portion 17a is substantially zero degrees. Next, the V-ribbed belt 4 is hooked on the bending guide portion 11 so as to be along the pulley groove 2 a of the crank pulley 2. At this time, care should be taken that the belt mounting jig 9 does not separate from the pulley groove 2a of the crank pulley 2.

<Procedure (c)>
Next, as shown in FIG. 7, the crank pulley 2 is rotated in the rotation direction, that is, in the first rotation direction A, on the curved surface 11 a side that bends the V-ribbed belt 4 in the bending guide portion 11.

  Specifically, first, the crank pulley 2 is rotated in the first rotation direction A so as to change from the state of FIG. 6 to the state of FIG. Then, high tension is generated in the V-ribbed belt 4 by being stretched. Since the V-ribbed belt 4 intersects the pulley pressing portion 10, the tension acts as a pressing action that presses the pulley pressing portion 10 against the pulley groove 2 a of the crank pulley 2, and is provided on the back surface of the pulley pressing portion 10. Further, the fitting between the five ribs 12 and the pulley groove 2a provided on the outer peripheral surface of the crank pulley 2 is further strengthened.

  Continuously, the crank pulley 2 is rotated in the first rotation direction A so as to change from the state of FIG. 8 to the state of FIG. 9. Then, the V-ribbed belt 4 on the side surface 2c of the crank pulley 2 gets over the pulley flange 2b and moves onto the pulley pressing portion 10.

  Specifically, when the crank pulley 2 is rotated in the first rotation direction A, the region of fitting of the V-ribbed belt 4 with respect to the pulley groove 2a of the crank pulley 2 gradually becomes wider.

  Further, the crank pulley 2 is rotated in the first rotation direction A. Then, the V-ribbed belt 4 on the pulley pressing portion 10 leaves the pulley pressing portion 10 and moves to the outer periphery of the crank pulley 2. After this movement, the belt mounting jig 9 is recovered from the outer periphery of the crank pulley 2.

  As described above, the belt attachment jig 9 according to the present embodiment is configured as follows. The belt attaching jig 9 is disposed on the outer periphery of the crank pulley 2 and is arranged on the outer periphery of the crank pulley 2 by the tension of the V-ribbed belt 4 introduced from the side surface 2c of the crank pulley 2 to the outer periphery of the crank pulley 2 across the pulley flange 2b. A pulley pressing portion 10 that is pressed against the pulley, and a V-ribbed belt that is provided on the side surface 10a of the pulley pressing portion 10 and that is introduced to the outer periphery of the crank pulley 2 across the pulley pressing portion 10 from the side surface 2c of the crank pulley 2 Bending guide 11 for bending 4 along the outer periphery of crank pulley 2 and a fitting provided on the back surface of pulley pressing portion 10 and fitted in pulley groove 2a provided on the outer peripheral surface of crank pulley 2 And a rib 12 as a part.

  Compared with the reference jig 1, the belt mounting jig 9 has a structure that does not have an inclined surface and a guide surface on the surface of the sandwiching portion provided in the reference jig 1, and the inclined surface and the guide surface are It is not necessary to secure the area to be formed (the thickness of the pulley pressing portion 10), and the pulley pressing portion 10 can be made thin by reducing the thickness.

  Further, in the belt mounting jig 9, the bending guide portion 11 provided on the side surface 10 a of the pulley pressing portion 10 has a curved surface 11 a that bends at least the V-ribbed belt 4 bulges on the surface of the pulley pressing portion 10, thereby forming an L shape. is doing.

  According to said structure, the intensity | strength of the bending guide part 11 can be raised. Thereby, it is possible to sufficiently withstand the tension of the V-ribbed belt 4 applied to the bending guide portion 11.

  Further, the belt attachment jig 9 includes a contact portion 15 on the side surface 10 a of the pulley pressing portion 10 that contacts the side surface 2 c of the crank pulley 2.

  By providing the contact portion 15 that contacts the side surface 2c of the crank pulley 2 in this manner, the posture of the belt mounting jig 9 on the outer periphery of the crank pulley 2 is further stabilized. The attachment jig 9 can be prevented from being detached from the outer periphery of the crank pulley 2. Further, since the abutting portion 15 is located in the pulley flange 2b portion where the V-ribbed belt 4 straddles in a state of abutting on the side surface 2c of the crank pulley 2, when the belt attaching jig 9 is used, It is possible to prevent the pulley flange 2b from coming into contact with the pulley flange 2b, thereby preventing the V-ribbed belt 4 from being damaged.

  In the belt attachment jig 9, five ribs 12 that can be fitted into the five pulley grooves 2 a of the crank pulley 2 are formed on the back side of the pulley pressing portion 10.

  According to the above configuration, the outer periphery of the crank pulley 2 is provided on the back surface of the pulley pressing portion 10 by providing the same number of ribs 12 as the number of pulley grooves 2a provided on the outer peripheral surface of the crank pulley 2 as a fitting portion. The pulley groove 2a provided on the surface and the same number of ribs 12 as the pulley groove 2a can be fitted more firmly. As a result, the posture of the belt attachment jig 9 on the outer periphery of the crank pulley 2 is further stabilized, so that the belt attachment jig 9 can be prevented from being detached from the outer periphery of the crank pulley 2 due to the tension of the V-ribbed belt 4.

(Second Embodiment)
Next, the configuration of the belt attachment jig 29 according to the second embodiment will be described with reference to FIGS. 10 and 11. Note that the same parts as those in the first embodiment are not described here. 10A to 10D are perspective views of the belt mounting jig 29 as seen from different directions. FIG. 11 is a six-sided view of the belt attachment jig 29 according to the second embodiment of the present invention.

  In FIGS. 10 and 11, the belt mounting jig 29 that is compact and well-organized and is integrally formed is drawn from various directions.

  As shown in FIGS. 10 and 11, the belt attachment jig 29 includes a pulley pressing portion 30, a rib 32 provided on the back surface of the pulley pressing portion 30, and a bending guide portion 31 as main components. The belt attachment jig 29 further includes a contact portion 35. The belt attachment jig 29 is substantially equal to the width of the crank pulley 2 and is used in contact with the outer periphery of the crank pulley 2. The bending guide portion 31 and the contact portion 35 are shown in FIG. The direction is determined so as to be positioned above the side surface 2c of the.

  10 and 11, the pulley pressing portion 30 covers the pulley groove 2a (outer periphery) in a state where the belt attachment jig 29 is in contact with the outer periphery of the crank pulley 2. The pulley pressing portion 30 is curved in an arc shape along the pulley groove 2 a of the crank pulley 2 and has a width of at least the belt width 4 w of the V-ribbed belt 4. Further, unlike the pulley pressing portion 10 of the first embodiment, as shown in FIGS. 10 and 11, the pulley pressing portion 30 has substantially the same shape as the bent guide portion 31 along the V-ribbed belt 4. Yes. That is, when the belt attachment jig 29 is used, the surface of the pulley pressing portion 30 becomes almost invisible when the V-ribbed belt 4 is hung on the pulley pressing portion 30.

  On the back side of the pulley pressing portion 30, one rib 32 that can be fitted into one pulley groove 2a of the crank pulley 2 is formed. Unlike the case of the first embodiment, the number of ribs 12 is one.

  In the belt attachment jig 29 according to the second embodiment, only one rib 32 is provided on the back surface of the pulley pressing portion 30 as a fitting portion. According to this, the structure of the belt attachment jig 29 can be simplified and made more compact. Although it may seem that the posture of the belt mounting jig 29 on the outer periphery of the crank pulley 2 is unstable, the crank pulley 2 is held between the one rib 32 and the contact portion 35. The posture of the belt attachment jig 29 on the outer periphery of the belt is stabilized.

  Further, in the belt attachment jig 29, the pulley pressing portion 30 has a shape in which the V-ribbed belt 4 is placed along the bending guide portion 31, so that the pulley pressing portion 30 has a minimum required compact structure. Can do. Further, by reducing the surface area of the pulley pressing portion 30, the pressing force per unit area that the V-ribbed belt 4 presses the pulley pressing portion 30 against the outer periphery of the crank pulley 2 can be increased. As a result, the posture of the belt mounting jig 29 on the outer periphery of the crank pulley 2 is further stabilized, so that the belt mounting jig 29 can be prevented from being detached from the outer periphery of the crank pulley 2 due to the tension of the V-ribbed belt 4. .

  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 Engine body 2 Crank pulley 2a Pulley groove 2b Pulley flange 2c Side surface of crank pulley 2 Alternator pulley 4 V-ribbed belt 9 Belt mounting jig 10 Pulley pressing portion 10a Side surface of pulley pressing portion 10 Bending guide portion 11a Curved surface 12 Rib 15 Contact part A First direction of rotation B Second direction of rotation

Claims (6)

Installed on the outer circumference of the first pulley when winding a belt that can be expanded and contracted in the circumferential direction between the first pulley and the second pulley while the distance between the axes of the first pulley and the second pulley is fixed. A belt mounting jig to be used,
A pulley pressing portion disposed on the outer periphery of the first pulley and pressed against the outer periphery of the first pulley by the tension of the belt;
A bending guide provided on the side surface of the pulley pressing portion and for bending the belt introduced to the outer periphery of the first pulley across the edge from the side surface of the first pulley so as to follow the outer periphery of the first pulley And
A fitting portion provided on the back surface of the pulley pressing portion and fitted in a groove provided on an outer peripheral surface of the first pulley;
A belt mounting jig comprising:   The bending guide portion provided on a side surface of the pulley pressing portion has at least a portion that bends the belt protruding on the pulley pressing portion, and has an L shape. Belt mounting jig.   The side surface of the pulley pressing portion is the same side surface as the side surface where the bending guide portion is provided on the side where the belt is introduced to the outer periphery of the first pulley, and at least the bending portion The belt mounting jig according to claim 1, further comprising a contact portion that contacts a side surface of the first pulley on a side opposite to the side on which the guide portion is provided.   The belt fitting jig according to any one of claims 1 to 3, wherein the fitting portion is the same number of ribs as the number of grooves provided on the outer peripheral surface of the first pulley.   The belt fitting jig according to claim 3, wherein the fitting portion is one rib.   The belt attachment jig according to any one of claims 1 to 5, wherein the pulley pressing portion has a shape in which the belt is placed along the bending guide portion.

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