JP6016660B2 - Pulley unit for transmission belt and belt transmission apparatus provided with the same - Google Patents

Description

  The present invention relates to a self-aligning type pulley unit for a transmission belt that operates so as to automatically correct the meandering or deviation on the pulley of the transmission belt, and a belt transmission device including the pulley unit. About.

  In general, in a transmission device using a flat belt, the flat belt may meander while the vehicle is traveling, or may travel offset on one side of the pulley in the width direction. This is due to changes in the elements that make up the transmission device, such as displacement of the flat belt from the normal position in the pulley shaft direction, deflection of the pulley shaft due to changes in shaft load, and vibration of the pulley itself, compared to other transmission belts. Because it is sensitive. When such meandering or offset running occurs, the flat belt comes into contact with the flange of the pulley, and fluffing or fraying occurs on the side end surface of the flat belt.

  On the other hand, a self-aligning type pulley unit for a transmission belt having a function of suppressing meandering and deviation of a flat belt is known. For example, Patent Document 1 discloses a pulley main body around which a transmission belt is wound so as to be able to travel, and a cylindrical alignment that is inserted through a bearing on the inner peripheral side of the pulley main body and rotatably supports the pulley main body. A ring (shaft member) and a support mechanism that supports the aligning ring so as to be swingable around a predetermined pivot axis, and the side of the transmission belt on the pulley body that is offset when meandering or offset occurs Discloses a self-aligning type pulley unit for a transmission belt that displaces the pulley main body portion to the front side in the belt traveling direction.

  In the transmission belt pulley unit disclosed in Patent Document 1, the support mechanism has a fixed shaft (support rod) inserted into the cylindrical hole of the aligning ring, and between the fixed shaft and the aligning ring, A resin sliding member (resin component) that generates a sliding resistance is interposed between at least one of them. The sliding member has a pin hole (engagement hole) at the center thereof, and one support pin is inserted through the pin hole and each hole formed in the fixed shaft and the aligning ring. Thus, it is positioned between the fixed shaft and the aligning ring.

JP 2011-236943 A

  In the pulley unit for a transmission belt as disclosed in Patent Document 1, the aligning ring is most preferably a simple cylindrical shape whose inner peripheral surface is formed in a circular shape, from the viewpoint of keeping parts processing costs low. However, when such a structure is adopted, the portion corresponding to the inner peripheral surface of the aligning ring of the sliding member used for generating the sliding resistance exhibits an arc surface having the same radius of curvature as the inner peripheral surface. It needs to be shaped. For this reason, it is necessary to match the dimension of the arc portion of the sliding member with the dimension of the inner peripheral surface of the aligning ring with high accuracy, which increases the part processing cost.

  In addition, the above-described pin hole needs to be formed in the sliding member, but if the shape of the sliding member has the above-described arc surface, the pin hole is slightly displaced from a predetermined position set in advance. In this case, at the position where the pin hole corresponds to each hole of the fixed shaft and the aligning ring, the arc surface of the sliding member and the inner peripheral surface of the aligning ring do not match, and the support mechanism portion of the pulley unit for the transmission belt However, even if it can be assembled, the sliding resistance generated between the fixed shaft and the aligning ring may be biased and the function of the meandering control may not be sufficiently performed.

  The present invention has been made in view of such a point, and the object of the present invention is to be able to stably suppress meandering and shifting of the transmission belt, and to easily assemble the component processing cost at a low cost. It is providing the pulley unit for power transmission belts.

  In order to achieve the above object, according to the present invention, while the aligning ring is a simple cylindrical shape, the surface corresponding to the slide member in the aligning ring and the fixed shaft is a flat surface, and the sliding member is flat. The sliding member is configured to be adjustable before positioning by inserting a support pin.

  Specifically, the present invention is directed to a self-aligning type pulley unit for a transmission belt and a belt transmission device including the pulley unit. The following solution is provided.

  That is, the first invention is the above-described pulley unit for a transmission belt, wherein a cylindrical aligning ring that rotatably supports the pulley body is provided inside a pulley body around which the transmission belt is movably wound. Pulley, a fixed shaft inserted into the aligning ring, and a pair of support holes that are inserted into through holes formed in the fixed shaft and whose both end portions correspond to each other on the aligning ring. And a support pin that swingably supports the aligning ring on the fixed shaft, and a pin hole through which the support pin is inserted, and is inserted between the fixed shaft and the aligning ring. And a sliding member positioned with respect to the fixed shaft and the aligning ring by the support pin inserted through the pin hole. The inner peripheral surface of the aligning ring is formed in a circular shape. A pair of insertion holes are formed in the centering ring so as to penetrate in a radial direction intersecting the support pins, and a surface corresponding to the sliding member is formed on the inner surface of the pair of insertion holes as a flat surface. Has been. Moreover, the surface corresponding to the sliding member of the fixed shaft is also formed as a flat surface. In the first aspect of the present invention, the sliding member is made of a flat plate and can be adjusted in the radial direction of the aligning ring and the direction along the cylinder center line before being positioned by the support pin. It is inserted into the inside of the aligning ring from the insertion hole, and is in surface contact with both the flat surfaces.

  According to a second aspect of the present invention, in the transmission belt pulley unit of the first aspect, the support pin is tilted forward in the traveling direction of the transmission belt with respect to the axial load direction due to the tension of the transmission belt, and the tilt angle thereof is An angle greater than 0 degrees and less than 90 degrees.

  According to a third aspect, in the transmission belt pulley unit according to the second aspect, the tilt angle of the support pin is greater than 0 degree and less than 45 degrees.

  According to a fourth aspect of the present invention, in the transmission belt pulley unit according to any one of the first to third aspects, a sliding member is provided between the inner surface of the through hole of the fixed shaft and the support pin. Features.

  According to a fifth invention, in the pulley unit for a transmission belt according to any one of the first to fourth inventions, the support pin is located near the center in the width direction of the pulley body.

  A sixth invention is the belt transmission device described above, comprising the transmission belt pulley unit of any one of the first to fifth inventions, wherein the pulley of the transmission belt pulley unit is pressed against the transmission belt. A tension is applied to the transmission belt.

  According to the first invention, the aligning ring and the fixed shaft are each formed with a flat surface as a surface corresponding to the sliding member, and a sliding member made of a flat plate material is inserted between these flat surfaces. Since the sliding member is in surface contact with both flat surfaces, when the aligning ring swings, a stable sliding resistance is provided between at least one of the aligning ring and the fixed shaft and the sliding member. Can be generated. As a result, the transmission belt pulley unit can sufficiently exhibit the meandering control function, and the meandering and shifting of the transmission belt can be stably suppressed.

  Further, according to the first invention, the position of the sliding member can be adjusted in the radial direction of the aligning ring and the direction along the cylinder center line before the sliding member is positioned by the support pin. Even when the pin hole is formed to deviate from a predetermined position, a pair of supports formed in the through hole formed in the fixed shaft and the aligning ring can be adjusted by appropriately adjusting the position of the sliding member. The pin hole can correspond to the hole. Therefore, a situation where the sliding member cannot be assembled at a position where the pin hole of the sliding member corresponds to each hole of the fixed shaft and the aligning ring as in the conventional transmission belt pulley unit is avoided, and the pulley for the transmission belt is avoided. Assembling of the unit can be facilitated.

  And according to 1st invention, since the flat surface of the said aligning ring is formed in the inner surface of a pair of insertion hole penetrated and formed facing the radial direction which cross | intersects a support pin, a aligning ring is circular. The flat surface which is in surface contact with the sliding member can be formed on the aligning ring, while having a simple cylindrical shape having the inner peripheral surface. Furthermore, since the surface corresponding to the sliding member is formed as a flat surface in the fixed shaft, a sliding member made of a flat plate material can be used. As described above, since the aligning ring and the sliding member have simple shapes, it is possible to reduce the processing cost for both of these parts and to increase the processing accuracy. Therefore, the parts processing cost of the transmission belt pulley unit can be reduced at a low cost, and a high-quality transmission belt pulley unit can be provided.

  According to the second invention, the pulley body is swingably supported around the support pin via the aligning ring, and the support pin is in the traveling direction of the transmission belt with respect to the direction of the axial load due to the tension of the transmission belt. Since the front side is tilted at an angle of more than 0 degrees and less than 90 degrees, when the transmission belt is offset in the width direction of the pulley body, the pulley body has a height difference in the axial load direction. Both a return force caused by tilting so as to occur and a return force caused when the pulley body is inclined with respect to the transmission belt work. The transmission belt travels at a position where the resultant force of both the return forces and the offset force acting on the transmission belt are balanced by the characteristics of the belt transmission device. Thus, it is possible to specifically prevent the transmission belt from meandering and shifting.

  According to the third invention, since the tilt angle of the support pin is set to an angle range exceeding 0 degree and less than 45 degrees, compared to the case where the tilt angle is 45 degrees or more and less than 90 degrees, It is possible to effectively use the return force generated when the pulley main body is in an oblique state. In the third aspect of the present invention, the latter is more effective in preventing the deviation between the return force caused by the inclination of the pulley body acting on the transmission belt and the return force caused when the pulley body is obliquely crossed. Accordingly, it is possible to satisfactorily prevent the transmission belt from meandering and shifting.

  According to the fourth aspect of the present invention, when the transmission belt is displaced on the pulley body and the axial load is shifted from the position corresponding to the support pin, even if the axial load acts on the support pin, the support belt Since a sliding material is provided between the pin and the through hole of the fixed shaft, the sliding resistance between the two is not so great. Therefore, the sliding resistance against the swing of the pulley body can be reduced. As a result, the pulley body smoothly swings and displaces without delay with respect to the deviation of the transmission belt, and the transmission belt is given a necessary and sufficient return force with respect to the deviation force. Can be satisfactorily prevented.

  According to the fifth aspect of the invention, since the support pin serving as the swing center when the pulley body swings is located near the center in the width direction of the pulley body that is the rotating body, the center in the width direction of the transmission belt is the pulley. This is advantageous in positioning and driving near the center in the width direction of the belt running surface of the main body.

  According to the sixth aspect of the present invention, the transmission belt pulley unit can prevent the transmission belt from meandering and shifting while applying a stable tension to the transmission belt. It will be advantageous in making full use of transmission capacity.

FIG. 1 is a side view schematically showing a configuration of a belt transmission device according to an embodiment of the present invention. FIG. 2 is a front view schematically showing the configuration of the pulley unit for a transmission belt according to the embodiment of the present invention. 3 is a cross-sectional view schematically showing a cross-sectional structure of a transmission belt pulley unit taken along line III-III in FIG. FIG. 4 is a cross-sectional view schematically showing a configuration of a main part of the pulley unit for a transmission belt according to the embodiment of the present invention. FIG. 5 is a side view schematically showing a configuration of a main part of the pulley unit for a transmission belt according to the embodiment of the present invention. FIGS. 6A and 6B are perspective views showing the shape of the sliding member of the transmission belt pulley unit according to the embodiment of the present invention. FIG. 7 is an explanatory view showing the operation of the transmission belt pulley unit according to the embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its application, or its use.

<< Embodiment of the Invention >>
FIG. 1 is a side view showing a schematic configuration of a belt transmission device 1 according to this embodiment. The belt transmission device 1 according to the present embodiment is a transmission device that uses a pulley 10 of a self-aligning transmission belt pulley unit 5 as a tensioner.

  As shown in FIG. 1, the belt transmission device 1 has a structure in which a transmission belt 4 is wound around a driving pulley 2 and a driven pulley 3 that are arranged apart from each other. The transmission belt 4 is a flat belt, and the driving pulley 2 and the driven pulley 3 are each a flat pulley. In this belt transmission device 1, the pulley 10 of the transmission belt pulley unit 5 according to the present invention is pressed against the back surface of the transmission belt 4 as a tensioner in order to apply tension to the transmission belt 4.

  Note that the overall configuration of the illustrated belt transmission device 1 is merely an example, and when the belt transmission device 1 is used for various industrial machines and other devices, various layouts are adopted for the belt transmission device 1 as necessary. be able to.

  The configuration of the transmission belt pulley unit 5 is shown in FIGS. FIG. 2 is a front view showing a schematic configuration of the transmission belt pulley unit 5. 3 is a cross-sectional view showing a cross-sectional structure of the transmission belt pulley unit 5 taken along line III-III in FIG.

  As shown in FIGS. 2 and 3, the transmission belt pulley unit 5 includes a pulley 10 on which the transmission belt 4 is wound so as to be able to travel, and a support mechanism 20 that supports the pulley 10.

  The pulley 10 includes a cylindrical pulley body 11 that directly contacts the transmission belt 4 wound around the pulley 10, an annular bearing 13 that is press-fitted into a cylindrical hole of the pulley body 11, and an inner periphery of the bearing 13. And a cylindrical aligning ring 17 press-fitted to the side. The pulley body 11 is rotatably supported by the aligning ring 17 via the bearing 13.

  The bearing 13 includes a double row having an outer ring 14 and an inner ring 15 that are arranged to face each other, and a plurality of balls 16 that are interposed between the outer ring 14 and the inner ring 15 so as to be arranged in two rows in the axial direction. It is a ball bearing. The outer ring 14 of the bearing 13 is connected to the inner peripheral side of the pulley body 11 so as to rotate integrally with the pulley body 11. Further, the inner ring 15 of the bearing 13 is connected to the outer peripheral side of the aligning ring 17 and is fixed to the aligning ring 17.

  The aligning ring 17 has a circular inner peripheral surface and is formed in a simple cylindrical shape. A state in which a support hole 18 having a circular cross-section into which a support pin 25 to be described later is inserted passes through the aligning ring 17 at two locations facing each other through the center of the cylinder at an approximately central position in the axial direction of the aligning ring 17 It is formed in a pair.

  A schematic configuration of the support mechanism 20 is shown in FIG. FIG. 4 is a cross-sectional view showing the cross-sectional structure of the aligning ring 17 and the configuration disposed inside thereof.

  As shown in FIGS. 3 and 4, the support mechanism 20 has a fixed shaft 21 inserted into the cylindrical hole of the aligning ring 17, and a columnar shape that supports the aligning ring 17 in a swingable manner on the fixed shaft 21. And a support pin 25. The support pin 25 constitutes a swing center P when the aligning ring 17 swings.

  The fixed shaft 21 is a rod-shaped member, and the basic shape has a circular cross section. A portion on the base end side of the fixed shaft 21 is attached to a support body such as a housing of the belt transmission device 1. On the other hand, a portion on the tip side of the fixed shaft 21 has an outer dimension smaller than the inner diameter dimension of the aligning ring 17 and is inserted through the cylindrical hole of the aligning ring 17.

  A portion on the tip side of the fixed shaft 21 is formed in a shape obtained by partially cutting a rod having a circular cross section, and a rectangular flat surface 21a orthogonal to the swing center P is formed on the outer periphery thereof. Have. The flat surface 21a is directly opposed (facing) to one of the pair of support holes 18 formed in the aligning ring 17 and constitutes a surface corresponding to a sliding member 30 described later. ing.

  A through hole 23 having a circular cross section that penetrates the fixed shaft 21 in the radial direction along the swing center P is formed in the portion of the fixed shaft 21 where the flat surface 21a is formed. One end of the through hole 23 opens in the flat surface 21 a and corresponds to one support hole 18 formed in the aligning ring 17. Further, the other end of the through hole 23 opens in the arc surface 21 b on the outer periphery of the fixed shaft 21 and corresponds to the other support hole 18 formed in the aligning ring 17.

  A support pin 25 is inserted into the through hole 23 of the fixed shaft 21. That is, the support pin 25 is positioned near the center in the width direction of the pulley body 11 and is orthogonal to both the flat surfaces 21 a and 17 b of the fixed shaft 21 and the aligning ring 17. The length of the support pin 25 is the same as or slightly smaller than the inner diameter of the inner ring 15 of the bearing 13. Both end portions of the support pin 25 are fitted into a pair of support holes 18 formed in the aligning ring 17, and the aligning ring 17 is supported so as to be swingable together with the pulley body 11.

  Between the support pin 25 and the inner surface of the through hole 23 formed in the fixed shaft 21, a resin-made sliding material 27 formed in a cylindrical shape is provided. Thus, when the transmission belt 4 is displaced on the pulley body 11 and the axial load L shown in FIG. 2 is shifted from the position corresponding to the support pin 25 due to the tension of the transmission belt 4, the axial load L is supported. Even if the pin 25 is twisted, the sliding resistance generated between the inner surface of the through hole 23 of the fixed shaft 21 and the support pin 25 does not become so large.

  In addition, the support pin 25 is adjusted with the rocking center P between the arc surface 21b continuous with the flat surface 21a on the outer peripheral surface of the fixed shaft 21 and the inner peripheral surface of the aligning ring 17 surrounding the arc surface 21b. A gap S for allowing the mandrel 17 to swing with the pulley body 11 is formed.

  Further, as shown in FIG. 4, the aligning ring 17 has a pair of insertion holes 19 for inserting a sliding member 30, which will be described later, facing the rocking center P, that is, the radial direction orthogonal to the support pin 25. Is formed. The pair of insertion holes 19 penetrates toward the side of the flat surface 21 a on the side where the flat surface 21 a of the fixed shaft 21 faces in the aligning ring 17.

  FIG. 5 shows a side view of the aligning ring 17 in which the insertion hole 19 is formed. In FIG. 5, the pulley main body 11 and the bearing 13 are omitted. As shown in FIG. 5, the pair of insertion holes 19 formed in the aligning ring 17 are elongated holes extending in a direction along the cylinder center line of the aligning ring 17 (left and right direction in FIG. 5). In each insertion hole 19, the length of the alignment ring 17 in the direction along the cylinder center line is, for example, about 10.0 mm to 40.0 mm, and the direction along the outer periphery of the alignment ring 17 (in FIG. 5). The width in the vertical direction is, for example, about 1.0 mm to 5.0 mm.

  As shown in FIG. 4, the inner surface portions of the pair of insertion holes 19 positioned on the fixed shaft 21 side are formed to be flush with the flat surface 21 a of the fixed shaft 21. On the other hand, the inner surface portion of the pair of insertion holes 19 located on the opposite side of the fixed shaft 21 forms a flat surface 17 a that faces the flat surface 21 a of the fixed shaft 21. That is, the surface of the aligning ring 17 facing the flat surface 21a of the fixed shaft 21 on the inner peripheral surface of the aligning ring 17 is formed on the flat surface 17a while the shape of the aligning ring 17 is a simple cylindrical shape. The flat surface 17a constitutes a surface corresponding to a sliding member 30 described later.

  A resin-made sliding that generates a sliding resistance between the flat surface 17a of the aligning ring 17 and the flat surface 21a of the fixed shaft 21 between at least one of the two flat surfaces 17a and 21a. A member 30 is inserted. The sliding member 30 is made of a flat plate material in which the surfaces on both sides corresponding to the aligning ring 17 and the fixed shaft 21 are formed as flat surfaces.

  The sliding member 30 is formed of a resin material in which a thermoplastic resin is used as a base material and an organic fiber such as carbon fiber is blended for the purpose of improving wear resistance. The thermoplastic resin used for the base material of the sliding member 30 is not particularly limited, but a resin having high heat resistance is preferable because the bearing 13 generates a high temperature while the transmission belt 4 is running. Specifically, amide resins such as 6-nylon, 66-nylon, aromatic nylon, 46-nylon, and engineering plastics such as polycarbonate, polyphenylene sulfide, polyetherimide, and tetratetrafluoroethylene (PTFE) are suitable. Adopted.

  The perspective view about the shape of the sliding member 30 is shown to Fig.6 (a), (b). The sliding member 30 may be formed in a rectangular shape as shown in FIG. 6A, or may be formed in an annular shape as shown in FIG. In addition, various shapes can be adopted for the sliding member 30 as long as both surfaces are flat.

  A pin hole 31 through which the support pin 25 is inserted is formed in a central portion of the sliding member 30 so as to penetrate in the thickness direction of the sliding member 30. In other words, the pin hole 31 is made to correspond to the through hole 23 and the support hole 18 so as to communicate the through hole 23 formed in the fixed shaft 21 and the support hole 18 of the aligning ring 17 at a position corresponding thereto. It is arranged at the position. The sliding member 30 is fastened by a support pin 25 inserted into the pin hole 31 together with the through hole 23 and the support hole 18, and is positioned with respect to the fixed shaft 21 and the aligning ring 17.

  The sliding member 30 is inserted from one of the pair of insertion holes 19 into the aligning ring 17, that is, between the aligning ring 17 and the flat surfaces 17 a and 21 a of the fixed shaft 21. As shown in FIG. 5, the length of the sliding member 30 in the direction along the cylinder center line of the aligning ring 17 is set to 0.5 mm shorter than the insertion hole 19, for example, 9.5 mm to 39.5 mm. It is about the length. Further, the thickness of the sliding member 30 is substantially the same as the width of the insertion hole 19, for example, about 1.0 mm to 5.0 mm.

  The sliding member 30 is in surface contact with both flat surfaces 17 a and 21 a formed on the aligning ring 17 and the fixed shaft 21. Since both surfaces of the sliding member 30 are flat surfaces and the surfaces corresponding to the sliding member 30 in the aligning ring 17 and the fixed shaft 21 are also flat surfaces 17a and 21a, the sliding member 30 is positioned by the support pins 25. The position can be adjusted in the radial direction (left and right direction in FIG. 4) and the direction along the cylinder center line (left and right direction in FIG. 3) of the aligning ring 17 in a state before being performed.

  As shown in FIG. 2, the transmission belt pulley unit 5 configured as described above has the support pin 25 (swing center P) in the rotational direction of the pulley body 11 with reference to the direction of the axial load L due to the tension of the transmission belt 4. The front side, that is, the front side of the transmission belt 4 in the running direction R is tilted by an angle α that is greater than 0 degree and less than 90 degrees. As a result, the transmission belt pulley unit 5 has an effective return force for returning the transmission belt 4 when the transmission belt 4 that is wound around the pulley 10 is shifted in the width direction of the pulley body 11. To be generated.

  FIG. 7 is a plan view showing the operation of the transmission belt pulley unit 5. In FIG. 7, the state when the transmission belt 4 is in a normal running state is indicated by a solid line, and the state when the transmission belt 4 is offset in the width direction on the pulley body 11 is indicated by a two-dot chain line.

  In the transmission belt pulley unit 5, as shown by a solid line in FIG. 7, when the transmission belt 4 is hooked near the center in the width direction of the pulley body 11, the vector of the axial load L due to the tension of the transmission belt 4 is supported. It intersects with the pin 25 (swing center P) and its vector acts on the support pin 25. On the other hand, as shown by a two-dot chain line in FIG. 7, when the transmission belt 4 approaches one side from the center in the width direction of the pulley body 11, the axial load L shifts to one side, and the vector of the axial load L is aligned. It also acts on the wheel 17. Then, the rotational force around the support pin 25 (swing center P) acts on the aligning ring 17 by the component force of the axial load L, and the aligning ring 17 rotates and swings around the support pin 25 together with the pulley body 11 (swing). ).

  When the pulley main body 11 is pivotally displaced in this way, the swing center P is tilted forward in the rotational direction of the pulley main body 11, so that the pulley main body 11 is caused by the deviation of the center of the axial load L due to the deviation. In the direction of the axial load L, the inclined side of the transmission belt 4 is higher (upward in FIG. 2) and lower in the opposite direction (lower in FIG. 2), and in FIG. As shown, the transmission belt 4 is obliquely crossed. When the pulley body 11 is in such a state, a return force caused by the inclination of the pulley body 11 and a return force caused when the pulley body 11 is obliquely acted on the transmission belt 4.

  Of the return force caused by the inclination of the pulley body 11 acting on the transmission belt 4 and the return force caused when the pulley body 11 is in an oblique state, the latter is more effective in preventing deviation. From this, in order to effectively use the return force due to the pulley body 11 being in the oblique state, the tilt angle of the support pin 25 is set to an angle range of more than 0 degrees and less than 45 degrees. It is preferable that it is 30 degrees or less.

  In the transmission belt pulley unit 5, the transmission belt 4 travels at a position where the resultant force of the both return forces balances the offset force acting on the transmission belt 4 due to the characteristics of the belt transmission device 1. As a result, even if the transmission belt 4 is largely displaced due to a disturbance or the like, the transmission belt 4 is returned to a position where the return force and the offset force are balanced. Can be prevented.

  In the belt transmission device 1 of the present embodiment, the pulley 10 of the self-aligning type transmission belt pulley unit 5 having the function of returning the displacement of the transmission belt 4 as described above is used as the tensioner. 4 is able to prevent the transmission belt 4 from meandering and running to a side while giving a stable tension to the belt 4, which is advantageous in sufficiently exhibiting the transmission capability of the transmission belt 4.

-Effect of the embodiment-
According to this embodiment, the sliding member 30 is inserted between the flat surfaces 17a and 21a formed on the aligning ring 17 and the fixed shaft 21, and the sliding member 30 is placed on the flat surfaces 17a and 21a. Since they are in surface contact, when the aligning ring 17 is rotationally displaced around the support pin 25 together with the pulley body 11, it is stable between at least one of the aligning ring 17 and the fixed shaft 21 and the sliding member 30. The generated sliding resistance can be generated. As a result, the pulley body 11 is prevented from rotating and displacing with the aligning ring 17 more than necessary, and the return force acting on the transmission belt 4 becomes too large and the transmission belt 4 moves to the side opposite to the offset side. It is possible to avoid such a situation that the pulley main body 11 repeatedly swings and the transmission belt 4 continues to meander and the travel position is not fixed due to this. Therefore, the transmission belt pulley unit 5 can sufficiently exhibit the meandering control function, and the meandering and deviation of the transmission belt 4 can be stably suppressed.

  Further, according to this embodiment, since the position of the sliding member 30 can be adjusted in the radial direction of the aligning ring 17 and the direction along the cylinder center line before being positioned by the support pin 25, the sliding member Even when the 30 pin holes 31 are formed slightly deviated from a predetermined position set in advance, the alignment of the through hole 23 formed in the fixed shaft 21 is adjusted by appropriately adjusting the position of the sliding member 30. The pin hole 31 can correspond to the pair of support holes 18 formed in the ring 17. Therefore, a situation where the sliding member cannot be assembled at a position where the pin hole of the sliding member is aligned with each hole of the fixed shaft and the aligning ring as in the conventional transmission belt pulley unit is avoided. Assembling of the unit 5 can be facilitated.

  According to this embodiment, since the flat surface 17a of the aligning ring 17 is formed by the inner surfaces of the pair of insertion holes 19, the aligning ring 17 has a simple cylindrical shape having a circular inner peripheral surface. In addition, the aligning ring 17 can be formed with a flat surface 17 a in surface contact with the sliding member 30. Furthermore, since the surface corresponding to the sliding member 30 is also formed on the flat surface 21a in the fixed shaft 21, the sliding member 30 made of a flat plate material can be used. As described above, since the aligning ring 17 and the sliding member 30 have simple shapes, it is possible to reduce the processing cost for these parts 17 and 30 and to increase the processing accuracy. Therefore, the parts processing cost of the transmission belt pulley unit 5 can be reduced at a low cost, and a high-quality transmission belt pulley unit 5 can be provided.

  In the above embodiment, the support pin 25 is orthogonal to both the flat surfaces 17a and 21a formed on the aligning ring 17 and the fixed shaft 21, but the present invention is not limited to this, and the support pin 25 is The aligning ring 17 is inserted into the holes 18 and 23 formed in the aligning ring 17 and the fixed shaft 21 and the pin holes 31 formed in the sliding member 30 so as to intersect the flat surfaces 17a and 21a. The fixed shaft 21 and the sliding member 30 may be connected in a skewered manner.

  Moreover, in the said embodiment, although the difference of the length of the direction along the cylinder center line of the aligning ring 17 in the sliding member 30 and the length of the insertion hole 19 was set to 0.5 mm, this invention is set. Not limited to this. The difference between the length of the sliding member 30 in the same direction and the length of the insertion hole 19 may be less than 0.5 mm (for example, about 0.2 mm) or more than 0.5 mm (for example, about 5.0 mm). It doesn't matter.

  In the above-described embodiment, the transmission belt pulley unit 5 according to the present invention is used as a tensioner. However, the use of the transmission belt pulley unit 5 according to the present invention is not limited thereto. It can be used for various applications in the belt transmission device 1 such as adjusting the contact angle and changing the belt running direction.

  As mentioned above, although preferable embodiment of this invention was described, the technical scope of this invention is not limited to the range as described in each said embodiment. It is understood by those skilled in the art that the above embodiments are examples, and that various modifications can be made to the combinations of the respective constituent elements and processing processes, and such modifications are within the scope of the present invention. It is a place.

  As described above, the present invention provides a self-aligning transmission belt pulley unit that operates to automatically correct a meandering belt or a deviation in the belt width direction, and a belt unit for the transmission belt. This is particularly useful for transmission belt pulley units where it is possible to stably suppress meandering and displacement of the transmission belt, and that parts processing costs are low and can be easily assembled. ing.

L Shaft load R Belt running direction 1 Belt transmission device 4 Transmission belt 5 Transmission belt pulley unit 10 Pulley 11 Pulley body 17 Alignment ring 17a Alignment ring flat surface 18 Support hole 19 Insertion hole 21 Fixed shaft 21a Fixed shaft Flat surface 23 Through hole 25 Support pin 27 Sliding material 30 Sliding member

Claims (6)

A pulley provided with a cylindrical aligning ring that rotatably supports the pulley body on the inner side of the pulley body around which the transmission belt is wound so as to travel;
A fixed shaft inserted into the aligning ring;
The centering wheel is inserted into a through hole formed in the fixed shaft, and both ends are fitted into a pair of support holes formed at positions facing each other of the aligning ring, and the aligning ring is swung on the fixed shaft. A support pin to support freely,
The pin has a pin hole through which the support pin is inserted, is inserted between the fixed shaft and the aligning ring, and is positioned with respect to the fixed shaft and the aligning ring by the support pin inserted into the pin hole. A pulley unit for a transmission belt provided with a sliding member,
The inner peripheral surface of the aligning ring is formed in a circular shape,
A pair of insertion holes are formed in the centering ring so as to penetrate in a radial direction intersecting the support pins, and a surface corresponding to the sliding member is formed on the inner surface of the pair of insertion holes as a flat surface. And
A surface corresponding to the sliding member of the fixed shaft is also formed as a flat surface,
The sliding member is made of a flat plate material, and can be adjusted in the radial direction of the aligning ring and in the direction along the cylinder center line before being positioned by the support pin. A pulley unit for a transmission belt, wherein the pulley unit is inserted into the belt and is in surface contact with both the flat surfaces. In the pulley unit for power transmission belts described in Claim 1,
The support pin is tilted forward in the traveling direction of the transmission belt with respect to the axial load direction due to the tension of the transmission belt, and the tilt angle is greater than 0 degree and less than 90 degrees. Pulley unit for transmission belt. In the pulley unit for transmission belts described in Claim 2,
A pulley unit for a transmission belt, wherein the tilt angle of the support pin is greater than 0 degrees and less than 45 degrees. In the pulley unit for power transmission belts described in any one of Claims 1-3,
A pulley unit for a transmission belt, wherein a sliding member is provided between an inner surface of the through hole of the fixed shaft and the support pin. In the pulley unit for power transmission belts described in any one of Claims 1-4,
The transmission belt pulley unit, wherein the support pin is positioned near a center in a width direction of the pulley body. A pulley unit for a transmission belt according to any one of claims 1 to 5,
The pulley of the transmission belt pulley unit is pressed against the transmission belt to apply tension to the transmission belt.
A belt transmission device characterized by that.

Images