JP4706600B2 - Endless belt for power transmission and manufacturing method thereof - Google Patents

Description

  The present invention relates to an endless belt for power transmission configured by arranging a large number of plate pieces called elements in an annular manner facing each other and attaching these elements to an endless ring, and a method for manufacturing the same.

  Conventionally, in a winding transmission device, an endless winding member such as a chain or a belt is used, and an example of the winding member is described in Patent Document 1. The winding member described in Patent Document 1 is a drive belt of a continuously variable transmission, and the drive belt of the continuously variable transmission includes a carrier formed by stacking a plurality of endless metal bands in a stacked manner, and V And a plurality of belt blocks each having a tapered side surface abutting against a driving surface of the belt belt and having a groove through which the carrier is inserted. Further, the carrier is formed with a constricted portion whose width is partially narrowed. Further, the belt block is provided with a fitting insertion portion that becomes an opening portion of the groove, and the size of the fitting insertion portion is wider than the width of the constricted portion. In the drive belt assembling step, the constricted portion is inserted into the groove through the fitting insertion portion, and the step of attaching the belt block to the carrier is repeated. The belt blocks are stacked and attached. And since the dimension of the said insertion part is wider than the width | variety of the said constriction part, it is supposed that the said belt block can be easily attached to the said carrier in the process of attaching a some belt block to the said carrier. Yes. The winding member and the manufacturing method thereof are also described in Patent Documents 2 to 4.

JP 60-91042 A JP 58-109747 A JP 2001-208138 A JP-A-61-70245

  However, in the drive belt described in Patent Document 1, since the size of the insertion portion is wider than the width of the constricted portion, the belt block is attached to the carrier and then the belt block is attached to the carrier. There was a risk of falling off.

  This invention was made against the background of the above circumstances, and an endless belt for power transmission capable of attaching an element to an endless ring and preventing the element from detaching from the endless ring, and It aims at providing the manufacturing method.

In order to achieve the above object, the invention of claim 1 has an endless ring and a plurality of elements mounted side by side in the circumferential direction of the endless ring, and the endless ring is included in the plurality of elements. There are formed recesses, and at both ends of the opening portions of the recesses, a pair of retaining portions spaced apart from each other with an opening width narrower than the width of the recesses are provided, and the plurality of elements In the endless belt for power transmission in which contact surfaces that contact the driving pulley and the driven pulley are respectively formed, the endless ring includes a plurality of divided rings divided in the width direction. split ring with each other is configured to be relatively moved in the circumferential direction, each notch on a portion corresponding to both edges of the width direction of the endless ring in said plurality of divided rings are formed Is is the width of the split ring at a point where notch of which are formed narrower, the state in which position of the pair of cut-out portions in the circumferential Direction endless ring are coincident with each other they narrower than the dimension of the width of the endless ring at the location of the notch on of minus half the difference between the width and the opening width of the recess from the width of the recess, the pair in the circumferential direction of the endless ring half of the difference between the width and the opening width of the recess from the width of narrower and the recess than the width of said recess of the endless ring at the position of each notch in a state in which position of the notch are offset from each other in It is characterized by being configured so as to be larger than the reduced dimension.

According to a second aspect of the present invention, in addition to the configuration of the first aspect , the second notch is formed on the edge opposite to the edge where the notch is formed in the split ring where the notch is formed. By providing, the shape of both edges of the split ring is made symmetrical in the width direction.

According to a third aspect of the present invention , in the first or second aspect of the present invention, each of the split rings is formed by laminating a plurality of annular thin metal plates, and the notch is at least one of the outer peripheral thin metal plates. Formed on the outermost metal thin plate, the metal thin plate on the inner peripheral side of the metal thin plate formed with the notch is configured such that the width as an endless ring formed by these metal thin plates is narrower than the opening width. This is an endless belt for power transmission.

Further, a pair invention of claim 4, having an endless ring, providing a plurality of elements having a recess, the ends of the opening portion of the recess, the interval to be not narrower opening width than the width of the recess The endless ring is provided by forming a contact surface that contacts the driving pulley and the driven pulley on the element, and inserting the endless ring through the opening and inserting it into the recess. In the method for manufacturing a power transmission endless belt, the power transmission endless belt is assembled by arranging the elements side by side in the circumferential direction, and a plurality of split rings are prepared by dividing the endless ring in the width direction. A pair of notches are provided at locations corresponding to both edges in the width direction of the endless ring, the plurality of split rings are arranged in the width direction, and the front The pair of cutout portions by matching the positions with each other in the circumferential direction of the endless ring-half of the difference between the width and the opening width of the recess width of the endless ring at the location of these notches from the width of the recess In the first step of making the dimension smaller than the reduced dimension, and the first step, the pair of notches are passed through between the pair of retaining portions in the element, and the endless ring is inserted into the recess. A second step of attaching the plurality of elements in the circumferential direction of the plurality of divided rings by repeating the operation of relatively moving the element and the plurality of divided rings in the circumferential direction of the endless ring. Then, following this second step, the positions of the pair of cutout portions in the circumferential direction of the endless ring are relatively moved so that the positions of the pair of cutout portions in the circumferential direction are mutually relative. Varied to a state in which the width of the endless ring and the above dimensions obtained by subtracting the half of the difference between the width and the opening width of the recess from the width of narrower and the recess than the width of the recess at the position of each notch, the it is a way to; and a third step to complete the assembly of the power transmission endless belt.

According to invention of Claim 1 or Claim 3, the notch part of a some division | segmentation ring is made to pass between between a pair of retaining parts in the said element, and the said some division | segmentation ring is inserted in the said recessed part The plurality of split rings are moved relative to each other in the circumferential direction of the endless ring so that the positions of the notches in the circumferential direction of the endless ring are different from each other. The pair of retaining portions can be prevented from passing through the notch at the same time, and the element can be prevented from being detached from the endless ring.

  According to the invention of claim 2, in addition to the same effect as that of the invention of claim 1, the power transmission endless belt is wound around the driving pulley and the driven pulley, and the power transmission endless belt is tensioned. When applied, stress is uniformly generated in the narrow cross-sectional portions formed by the notches provided on both edges in the width direction of the endless ring. Therefore, it is possible to suppress “stress concentration occurs at one edge in the width direction of the endless ring and excessive stress is generated”.

According to the invention of claim 4 , in the first step, the plurality of split rings are arranged in the width direction of the endless ring, and the positions of the notches in the circumferential direction of the endless ring are made to coincide with each other. In a second step subsequent to the first step, a pair of notches provided on both sides in the width direction of the endless ring are passed between a pair of locking portions in the element, and the endless ring is moved to the end. The plurality of elements can be attached in the circumferential direction of the endless ring by repeatedly inserting the element into the recess and relatively moving the element and the endless ring in the circumferential direction. In a third step following the second step, the plurality of split rings are relatively moved in the circumferential direction of the endless ring, and the positions of the notches in the circumferential direction of the endless ring are made different from each other. The assembly of the endless belt for power transmission is completed. Then, a pair of retaining portions formed on one element do not simultaneously pass through a pair of notches formed on the endless ring, and the element can be prevented from being detached from the endless ring.

  Next, the concept of the endless belt for power transmission in the present invention will be described. This endless belt for power transmission is configured in an annular shape, and this power transmission belt is wound around a pair of pulleys, that is, a driving pulley and a driven pulley, and transmits power between these pulleys. The power transmission endless belt includes an endless ring and a plurality of elements attached to the endless ring. A plurality of split rings divided in the width direction of the endless ring are provided. This number of divisions may be two or three, or four or more. These divided rings are arranged in a plurality of rows side by side in the width direction of the endless ring. Furthermore, the notch part is formed in the split ring arrange | positioned at the both ends of the width direction of an endless ring. Further, the split ring can be configured by laminating a plurality of thin plates on the inner and outer peripheries. In this case, notches may be formed in all the thin plates, the notches may be formed only in the thin plate located on the outermost peripheral side, or the plurality of thin plates including the thin plate located on the outermost peripheral side may be formed. A part may be formed. The power transmission endless belt of the present invention can change the ratio of the rotational speed between a pair of pulleys, that is, a winding transmission with a fixed gear ratio, or the gear ratio between a pair of pulleys. The present invention can be applied to any winding transmission device. The endless belt for power transmission in the present invention can be used, for example, in a continuously variable transmission provided in a power transmission path from a driving force source of a vehicle to wheels.

  Next, a usage example of the power transmission endless belt will be described with reference to the drawings. FIG. 2 is a conceptual diagram of a continuously variable transmission as an example of a winding transmission device that uses an endless belt for power transmission as a winding member, more specifically, a belt type continuously variable transmission 1. This belt-type continuously variable transmission 1 has a drive pulley 2 and a driven pulley 3, and a rotation axis A 1 of the drive pulley 2 and a rotation axis B 1 of the driven pulley 3 are arranged in parallel. The drive pulley 2 has a fixed piece 4 and a movable piece 5, and a holding groove 6 is formed between the fixed piece 4 and the movable piece 5. The driven pulley 3 also has a fixed piece 7 and a movable piece 8, and a holding groove 9 is formed between the fixed piece 7 and the movable piece 8. Both the movable pieces 5 and 8 of the drive pulley 2 and the driven pulley 3 are operable in the direction of the rotation axis, and an actuator (not shown) for controlling the operation of the movable pieces 5 and 8 is provided. Further, the power of a driving force source (not shown) such as an engine or a motor / generator is transmitted to the driving pulley 2. Further, the power of the driven pulley 3 is configured to be transmitted to wheels (not shown). An endless belt for power transmission (hereinafter simply referred to as “belt”) 10 is wound around the driving pulley 2 and the driven pulley 3. Then, the positions of the movable pulleys 5 and 8 in the axial direction are controlled, the widths of the grooves 6 and 9 are controlled, the gear ratio of the belt-type continuously variable transmission 1, that is, the rotational speed of the drive pulley 2, and the The ratio with the rotational speed of the driven pulley 2 is controlled, and the transmission torque ratio between the drive pulley 2 and the driven pulley 3 is controlled. Hereinafter, examples of the belt 10 will be sequentially described.

  A specific configuration example of the belt 10 will be described with reference to FIGS. 1, 3, 4, and 5. 1 and 3 show a state in which the belt 10 is wound around the driving pulley 2 and the driven pulley 3, and FIGS. 4 and 5 show a manufacturing process of the belt 10. The belt 10 includes an endless ring 11 and a plurality of elements 12 attached side by side in the circumferential direction of the endless ring 11. The endless ring 11 is composed of divided rings 13 and 14 that are divided into a plurality of parts in the width direction, specifically, divided into two. Each of the split rings 13 and 14 is configured by laminating a plurality of annular thin metal plates 15 in the inner and outer peripheral directions. Accordingly, each of the split rings 13 and 14 has flexibility. Further, the divided rings 13 and 14 are configured to be relatively movable in the circumferential direction of the endless ring 11. Furthermore, the metal thin plates 15 can also move relative to each other in the circumferential direction. Furthermore, the split rings 13 and 14 are set to have the same thickness W1 in the inner and outer peripheral directions, and the width L1 of the split ring 13 and the width L2 of the split ring 14 are the same in the width direction of the endless ring 11. Is set.

  The plurality of elements 12 are made of a metal material, and are attached in the circumferential direction of the endless ring 11 with the elements 12 stacked in the thickness direction. Each element 12 is formed with a recess 16 in which the endless ring 11 is disposed. The recess 16 is formed in the center of the element 12 in the width direction of the belt 10. The recess 16 is formed so as to open to the outer peripheral side of the belt 10 in a state where the belt 10 is assembled. In the width direction of the endless ring 11, the width L 3 of the recess 16 is set to be larger than the sum of the width L 1 of the split ring 13 and the width L 2 of the split ring 14. Further, the depth W2 of the recess 16 is set to be larger than the thickness W1. Further, a pair of column portions 17 are formed at both ends of each element 12, and the concave portion 16 is formed between the pair of column portions 17.

  A pair of retaining portions 18 are provided at the tips of the pair of pillars 17 so as to face both ends of the opening of the recess 16 and have a distance L4 that is narrower than the width L3 of the recess 16. That is, one retaining portion 18 is provided so as to protrude in the width direction of the belt 10 so as to approach each other. The distance L4 between the pair of retaining portions 18 is set smaller than the sum of the width L1 and the width L2. Further, notches 20 are provided at positions corresponding to both edges in the width direction of the endless ring 11 in the split rings 13 and 14. The cutout portion 20 is a cutout portion of all the thin metal plates 15. At the location where the notch 20 is provided, the width L5 of the split ring 13 and the width L6 of the split ring 14 are set to be the same. Furthermore, the width L5 is narrower than the width L1, and the width L6 is narrower than the width L2. That is, the split rings 13 and 14 are partially narrowed. Further, in the circumferential direction of the split rings 13 and 14, a length L7 of a portion corresponding to the widths L5 and L6 in the cutout portion 20 is set to be longer than the thickness T1 of the one element 12. .

Furthermore, when one split ring 13 is disposed in the recess 16 and the split ring 13 is moved in the recess 16 in a direction approaching the left column 17 in FIG. and the right end portion in the width L8 between the retaining portion 18 omission is configured larger than the width L6 of the other split ring 14. On the other hand , when the other split ring 14 is disposed in the recess 16 and the split ring 14 is moved in the recess 16 in a direction approaching the right column 17 in FIG. In FIG. 4, the width L9 between the left end portion and the retaining portion 18 is configured to be larger than the width L5 of the split ring 13. FIG. 4 shows a state in which the split ring 13 is pressed against the left column 17, and therefore, the width L5 is larger than the width L9 in the drawing. On the other hand, contact surfaces 21 that contact the movable pieces 5 and 8 and the fixed pieces 4 and 7 are formed at both ends of the element 12 in the width direction of the belt 10. Further, a positioning pin 22 is formed on one surface of the pair of support columns 17, and a positioning groove 23 is formed on the other surface of the pair of support columns 17. In a state where the assembly of the belt 10 is completed, the positioning pins 22 are inserted into the positioning grooves 23, and the elements 12 arranged adjacent to each other are positioned with respect to each other.

Next, a method for manufacturing the belt 10 will be described. The manufacturing method of the belt 10 is one that corresponds to the invention of claim 4, wherein in the manufacturing process of the endless ring 11, the split ring 13 having the notch 20, and the split ring 14 having a notch 20 is Manufactured as a separate (separated). On the other hand, a number of elements 12 are manufactured by pressing (punching) a metal material. These elements 12 are manufactured separately from the split rings 13 and 14 (in a separated state), and the concave portions 16 and a pair of retaining portions 18 are formed in the element 12. Next, the split rings 13 and 14 are arranged in the width direction and relatively moved in the circumferential direction, so that the positions of the cutout portions 20 in the circumferential direction of the split rings 13 and 14 as shown in FIG. Match (first step).

  In the second step subsequent to the first step, the following operation is performed. First, either one of the split rings 13, 14, for example, a portion corresponding to the notch 20 in the split ring 13 is passed between a pair of locking portions 18 in the one element 12, The split ring 13 is inserted into the recess 16 of the element 12. Then, the split ring 13 is pressed against one support column 17, and the portion having the notch portion 20 in the other split ring 14 is passed between a pair of locking portions 18, so that the inside of the recess 16 of the element 12. Insert into. By such an operation, the split rings 13 and 14 are both inserted into the recess 16 of the single element 12, and the single element 12 is attached to the split rings 13 and 14. Next, as shown in FIG. 5, one element 12 attached to the split rings 13 and 14 and the split rings 13 and 14 are moved relative to each other in the circumferential direction, and attached to the split rings 13 and 14. The element 12 is moved to a position where the notch 20 is not provided. Thereafter, the above operation is repeated, and a large number of elements 12 are sequentially attached over the entire circumference of the split rings 13 and 14. In a third step subsequent to the second step, the split ring 13 and the split ring 14 are relatively moved in the circumferential direction, and the split rings 13 and 14 in the circumferential direction are moved as shown in FIG. The operation of changing the positions of the notches 20 is performed, and the manufacturing process (assembly process) of the belt 10 is completed.

  Thus, in the state where the manufacture of the belt 10 is completed, the positions of the notches 20 in the circumferential direction of the split rings 13 and 14 are different from each other. The width L4 of the pair of retaining portions 18 is smaller than the sum of the width L1 of the one split ring 13 and the width L6 of the portion where the notch 20 of the other split ring 14 is provided. Further, the width L4 of the pair of retaining portions 18 is smaller than the sum of the width L2 of the other split ring 14 and the width L5 of the portion where the notch 20 of the one split ring 13 is provided. Therefore, before the belt 10 is wound around the driving pulley 2 and the driven pulley 2, the element 12 attached to the place where the notch portion 20 is provided in the circumferential direction of the belt 10 includes: It is possible to prevent the endless ring 11 from falling off.

  Next, the power transmission action in the belt type continuously variable transmission 1 will be described. When torque of a driving force source (not shown) is transmitted to the driving pulley 2, a compressive force corresponding to the torque of the driving pulley 2 is applied to the element 12 in contact with the driving pulley 2, A compressive force is transmitted to the element 12 in contact with the driven pulley 3 via each element 12, and a torque corresponding to the compressive force transmitted to the element 12 is generated in the driven pulley 3. In this way, the torque of the drive pulley 2 is transmitted to the driven pulley 3. Further, when the belt 10 wound around the drive pulley 2 and the driven pulley 3 is rotated, the split rings 13 and 14 are constituted by the difference in peripheral speed at the portions wound around the drive pulley 2 and the driven pulley 3. The metal thin plates 15 to be moved relatively move (relative slip) in the circumferential direction. For this reason, the notch part formed in all the metal thin plates 15 disperse | distributes in the circumferential direction. Therefore, the element 12 attached to the endless ring 11 can be prevented from falling off the endless ring 11.

  FIG. 6 is a plan view showing another configuration example of the split rings 13 and 14. In FIG. 6, a notch 20 and a notch 20 </ b> A are provided at both edges in the width direction of the split rings 13 and 14. The split rings 13 and 14 shown in FIG. 6 also have a notch 20A formed by notching a part of all the metal thin plates. In the split ring 13, the notch 20 and the notch 20A are disposed at the same position in the circumferential direction. In the split ring 14, the notch 20 and the notch 20A are disposed at the same position in the circumferential direction. Has been. Then, the belt 10 is wound around the drive pulley 2 and the driven pulley 3 to apply tension to the belt 10. If the split rings 13 and 14 shown in FIG. 6 are used, the split rings 13 and 14 are used. Since the stress is distributed almost uniformly in the width direction, the durability of the split rings 13 and 14 is improved.

  Here, the correspondence between the configuration described based on FIGS. 1 to 5 and the configuration of the present invention will be described. The endless ring 11 corresponds to the endless ring of the present invention, and the element 12 corresponds to the endless ring of the present invention. Corresponding to the element, the recess 16 corresponds to the recess of the present invention, the pair of retaining portions 18 corresponds to the pair of retaining portions of the present invention, and the driving pulley 2 corresponds to the driving pulley of the present invention. The driven pulley 3 corresponds to the driven pulley of the present invention, the contact surface 21 corresponds to the contact surface of the present invention, and the belt (power transmission belt) 10 corresponds to the power transmission belt of the present invention. The rings 13 and 14 correspond to a plurality of split rings according to the present invention, and the notch 20 corresponds to a notch according to the present invention.

  Another configuration example of the belt 10 shown in FIG. 2 will be described with reference to FIG. The element 12 is formed with a wide concave portion 16A and a narrow concave portion 16B. Here, the recess 16B is formed deeper than the recess 16A. Further, the width L10 of the recess 16A is wider than the interval L4. Furthermore, the width L11 of the recess 16B is set to be the same as the interval L4. The endless ring 11A in the second embodiment has split rings 13A and 14A. The split rings 13A and 14A divide the endless ring 11A into two in the width direction, and both the split rings 13A and 14A are configured by laminating a plurality of thin metal plates on the inner and outer peripheries. Specifically, it has a plurality of metal plates 15B stacked on the inner and outer peripheries and a single metal thin plate 15A disposed on the outside of the plurality of metal plates 15B. Here, in the split ring 13A, the metal thin plate 15A arranged on the outermost peripheral side has a width L1, and a notch 20 is provided at a part in the circumferential direction.

  The notch 20 portion in the metal thin plate 15A of the split ring 13A is set to a width L5. Further, in the split ring 14A, the thin metal plate 15A disposed on the outermost peripheral side has a width L2, and a notch 20 is provided in a part of the circumferential direction. The notch 20 portion in the metal thin plate 15A of the split ring 14A is set to a width L6. The sum of the width L1 and the width L2 is set smaller than the width L10. Further, in the split rings 13A and 14A, a plurality of other metal thin plates 15B are stacked inside the metal thin plate 15A, and the sum of the widths of the two metal thin plates 15B is set smaller than the width L11. Has been. In addition, in Example 2 shown in FIG. 7, the same code | symbol as Example 1 is attached | subjected about the same component as Example 1. FIG.

  In the assembly process of the belt 10 according to the second embodiment, one split ring passes between the pair of retaining portions 18 and is inserted into the recess. Specifically, the thin metal plate 15B is disposed in the recess 16B, and the thin metal plate 15A is disposed in the recess 16A. Then, after the split ring is pressed against one support column 17, the other split ring is inserted into the recess of the element 12. In this way, after the split rings 13A and 14A are both inserted into the recesses of the element 12, the split ring 13A and the split ring 14A are moved relative to each other in the circumferential direction so that the belt 10 moves in the circumferential direction. The positions of the notch 20 provided in the split ring 13A and the notch 20 provided in the split ring 14A are made different. Also in the second embodiment, the same effect as the first embodiment can be obtained for the same reason as the first embodiment. In the second embodiment, the recesses 16A and 16B correspond to the recesses of the present invention.

  Next, another configuration example of the belt 10 will be described with reference to FIG. In the third embodiment, the same components as those in the first and second embodiments are denoted by the same reference numerals as those in the first and second embodiments. In the third embodiment, in addition to the metal thin plate 15A located on the outermost peripheral side in the inner and outer peripheral directions of the endless ring 11, a plurality of metal thin plates arranged inside the metal thin plate 15A are the same as the metal thin plate 15A. It is configured. That is, both of the split rings 13A and 14A are configured by laminating a plurality of thin metal plates 15A and laminating a plurality of thin metal plates 15B inside thereof. And the said notch part 20 is formed in all the some metal thin plates 15A. In the third embodiment, the other configuration is the same as that of the second embodiment. In the third embodiment, the same effect as in the second embodiment can be obtained.

  Next, another configuration example of the belt 10 will be described with reference to FIG. In FIG. 9, the endless ring 11C is composed of the metal thin plates 15C and 15D arranged on the outermost peripheral side and a plurality of metal thin plates 15E arranged on the inner peripheral side of the metal thin plates 15C and 15D. The metal thin plates 15C and 15D are divided into two in the width direction of the endless ring 11C, similarly to the metal thin plate 15A. The metal thin plate 15C is set to the width L1, and the metal thin plate 15D is set to the width L2. Is set. Further, the metal thin plate 15C is formed with a notch 20, and the metal thin plate 15D is formed with a notch 20. The portion corresponding to the cutout portion 20 in the metal thin plate 15C is set to the width L5, and the portion corresponding to the cutout portion 20 in the metal thin plate 15D is set to the width L6. Further, the width of the metal thin plate 15C without the notch 20 is set to the width L1, and the portion of the metal thin plate 15D without the notch 20 is set to the width L2. The sum of the widths L1 and L2 is set to be larger than the distance L4 between the pair of retaining portions 18. On the other hand, the plurality of thin metal plates 15E are provided separately (separated) from the thin metal plates 15C and 15D, and are not divided in the width direction of the endless ring 11C. The plurality of thin metal plates 15E can be moved relative to the thin metal plates 15C and 15D in the circumferential direction of the belt 10. Further, the width L12 of the plurality of thin metal plates 15E is set to be narrower than the interval L4 and the width L11.

  In the process of assembling the belt 10 shown in FIG. 9, first, a plurality of thin metal plates 15E are stacked and passed between a pair of retaining portions 18 of one element 12 and inserted into the recess 16B. The Since the width L12 of the plurality of metal thin plates 15E is narrower than the interval L4, the plurality of metal thin plates 15E are not inhibited from being inserted into the recesses 16B by the pair of retaining portions 18. Then, one of the metal thin plates 15C and 15D is first inserted between the pair of retaining portions 18 and inserted into the recess 16A, and the notch 20 of the metal thin plate 15C and the notch of the metal thin plate 15C are inserted. The part 20 is arranged at the same position in the circumferential direction. Thereafter, the other thin metal plate is inserted into the recess 16A, and one element is attached to the endless ring 11C.

  Then, the element 12 attached to the endless ring 11C is moved in the circumferential direction of the endless belt 11C, and thereafter, the operation of attaching the other elements 12 to the endless belt 11C in the same manner as described above is repeated. In this way, after all the elements 12 are attached to the endless belt 11C, the metal thin plate 15C and the metal thin plate 15D are moved relative to each other in the circumferential direction, and the notch 20 of the metal thin plate 15C and the metal thin plate The position of the 15D notch 20 is varied in the circumferential direction, and the assembly of the belt 10 is completed. Thus, when the positions of the cutout portion 20 of the thin metal plate 15C and the cutout portion 20 of the thin metal plate 15D are made different in the circumferential direction, the element from the endless belt 11C according to the same principle as in the first embodiment. 12 can be prevented from falling off. In the fourth embodiment, the metal thin plates 15C and 15D correspond to the split ring of the present invention.

Next, another configuration example of the belt 10 shown in FIG. 2 will be described with reference to FIGS. 10 and 11. Although the example described here does not have the configuration according to the present invention, it has a plurality of split rings and is provided with a retaining portion so that the split rings are not detached from the recesses. This is a reference example common to the configuration according to the present invention. First, the second embodiment is the same as the first embodiment in that the endless ring 11 is divided into two in the width direction. Also, each of the split rings 13 and 14 is the same as the first embodiment in that the thin metal plates 15 are laminated. In the fifth embodiment, the sum of the width L1 of the split ring 13 and the width L2 of the split ring 14 is set to be shorter than the distance L4 between the pair of retaining portions 18. Further, most of the elements 12 arranged in the circumferential direction of the belt 10 have the same configuration as the elements 12 described in the first embodiment. In the circumferential direction of the belt 10, elements 24 having a configuration different from that of the elements 12 are arranged at predetermined intervals. For example, it is possible to arrange four elements 24 at equal intervals in the circumferential direction of the belt 10 at approximately 90 degrees. The element 24 has two pins (stoppers) 26 </ b> A and 26 </ b> B fixed to a bottom surface 25 facing the recess 16. The pins 26A and 26B are formed as separate members from the element 24, and the pins 26A and 26B are fixed to the element 24 in a later process. Examples of a method for fixing the pins 26A and 26B to the element 24 include methods such as welding, adhesion, and press-fitting. FIG. 11 shows a configuration in which a hole 27 is formed in the element 24, and the pins 26A and 26B are press-fitted into the hole 27.

  The two pins 26A and 26B are arranged in the width direction of the belt 10. The split ring 13 is arranged between one pin 26A and one column 17, and the other pin 26B and one pin 26 are arranged in one direction. The split ring 14 is disposed between the support column 17 and the support column 17. In this way, the split ring 13 disposed in the recess 16 is positioned with respect to the element 14 in the width direction of the belt 10 by the one pin 26A and the one column 17. Further, the split ring 14 disposed in the recess 16 is positioned with respect to the element 14 in the width direction of the belt 10 by the pin 26A and the one support column 17. A distance L13 between the pin 26A and the retaining portion 18 in the width direction of the belt 10 is set to be smaller than the width L1 of the split ring 13. For this reason, the split ring 13 disposed in the recess 16 of the element 24 is restricted by the retaining portion 18, thereby preventing the split ring 13 from coming out of the recess 16 of the element 24. Further, a distance L14 between the pin 26B and the retaining portion 18 in the width direction of the belt 10 is set to be smaller than a width L2 of the split ring 14. For this reason, the split ring 14 disposed in the recess 16 of the element 24 is restricted by the retaining portion 18, thereby preventing the split ring 14 from coming out of the recess 16 of the element 24.

  On the other hand, the split rings 13, 14 are configured by laminating metal thin plates 15, have a certain degree of strength in the width direction, and in the elements 24 arranged at four locations in the circumferential direction of the belt 10, The split rings 13 and 14 are positioned and fixed in the width direction. For this reason, the part arrange | positioned in the recessed part 16 of the other element 12 in the said split rings 13 and 14 is also prevented from moving to the direction in which the said split ring 13 and the said split ring 14 approach. That is, the split rings 13 and 14 are both held at a position in contact with the support column 17. Therefore, it is possible to prevent the portions of the split rings 13 and 14 arranged in the recesses 16 of the other elements 12 from coming out of the recesses 16 of the elements 12. In other words, the element 12 can be prevented from falling off the endless ring 11. In the fifth embodiment, the split rings 13 and 14 are not provided with a configuration corresponding to the notches 20 and 20A. For this reason, the width L1 of the split ring 13 is the same at any location in the circumferential direction, and the width L2 of the split ring 14 is the same at any location in the circumferential direction. The element 24 is also provided with the pin 22 and the positioning groove 23 described above.

  Next, a method for manufacturing the belt 10 shown in FIG. 10 will be described. First, the split rings 13, 14 are arranged side by side in the width direction, and the split rings 13, 14 are passed between a pair of retaining portions 18 of the element 12, so that the split rings 13, 14 are Arranged in the recess 16 of the element 12. A plurality of elements 24 are arranged between the elements 12. The method of attaching the element 24 to the split rings 13 and 14 is the same as that of the element 12. In this way, after a large number of elements 12 are sequentially attached to the endless ring 11 and a plurality of elements 24 are attached, the split ring 13 and the split ring 14 are connected in the width direction of the endless ring 11. The split ring 13 and the split ring 14 are both brought into contact with the support pillars 17 of the elements 12 and 24 while being separated from each other. Next, the pins 26A and 26B are attached to the bottom surface 25 of the element 24, and the assembly of the belt 10 is completed.

  As described above, after the assembly of the belt 10 is completed, the split rings 13 and 14 can be prevented from moving with respect to the elements 12 and 24 in the width direction of the belt 10. 2 and the driven pulley 3, or after the belt 10 is wound around the drive pulley 2 and the driven pulley 3, the elements 12 and 24 can be prevented from falling off the endless ring 11. In Example 5, the number of the elements 24 and the arrangement interval of the elements 24 in the circumferential direction of the belt 10 are determined based on the strength in the width direction of the endless ring 11 or the amount of deflection. 24 may be set to a value that does not drop off the endless ring 1.

Next, another configuration example of the belt 10 will be described with reference to FIGS. 10 and 12 . Although the example described here does not have the configuration according to the present invention, it has a plurality of split rings and is provided with a retaining portion so that the split rings are not detached from the recesses. This is a reference example common to the configuration according to the present invention. The belt 10 in the sixth embodiment includes an endless ring 11 having the configuration described with reference to FIG. 10 and a large number of elements 12 having the configuration described in the first embodiment. In the sixth embodiment, an element 30 having a configuration different from that of the element 12 is arranged between the multiple elements 12 as shown in FIG. For example, it is possible to arrange the four elements 30 at regular intervals about 90 degrees in the circumferential direction of the belt 10. In this element 30, two concave portions 31 are formed in the width direction of the belt 10, and an intermediate wall 32 is provided between the concave portions 31. That is, the recess 31 is formed between the support column 17 and the intermediate wall 32. The element 30 is not provided with the retaining portion 18. The element 30 is also provided with the pin 22 and the positioning groove 23 described above.

  And the division | segmentation rings 13 and 14 are separately arrange | positioned at each recessed part 31. FIG. A width L15 of the recess 31 in which the split ring 13 is disposed is configured to be larger than a width L1 of the split ring 13, and a width L15 of the recess 31 in which the split ring 14 is disposed is a width L1 of the split ring 14. It is configured larger than. Further, a pin (stopper) 33 for preventing the split rings 13 and 14 arranged in the recess 31 from coming out of the recess 31 is provided. The pin 33 is formed as a separate member from the element 30, and the pin 33 is attached to the element 30 in a later process. Both ends of the pin 33 are fixed to the pair of support columns 17. Examples of a method for fixing the pin 33 to the support column 17 include methods such as welding, adhesion, and press-fitting. FIG. 12 shows a configuration in which a hole 34 is provided in the support column 17 and a pin 33 is press-fitted into the hole 34. The pin 33 is disposed outside the split rings 13 and 14 and the intermediate wall 32 in the radial direction of the belt 10. In this way, the split ring 13 disposed in the recess 31 is positioned with respect to the element 30 in the width direction of the belt 10 by the intermediate wall 32 and the support column 17. Further, the split ring 14 disposed in the recess 31 is positioned with respect to the element 30 in the width direction of the belt 10 by the intermediate wall 32 and the support column 17. Further, the split rings 13 and 14 arranged in the recess 31 are prevented from coming out of the recess 31 by the pins 33.

  Next, a method for manufacturing the belt 10 shown in FIG. 12 will be described. First, the method of attaching the element 12 to the split rings 13 and 14 is the same as in the fifth embodiment. Then, the element 30 is inserted between the elements 12, and the element 30 is attached to the split rings 13 and 14. At this point, the pin 33 is not attached to the element 30. Therefore, when the element 30 is inserted between the elements 12, the split rings 13 and 14 are disposed in the recess 31 of the element 30. Thereafter, the pin 33 is attached and fixed to the element 30. In this manner, the plurality of elements 30 and the pins 33 are attached in the circumferential direction of the belt 10, and the assembly of the belt 10 is completed.

Thus, after the assembly of the belt 10 is completed, the split rings 13 and 14 come into contact with the intermediate wall 32, so that the split ring 13 and the split ring 14 move in the direction of approaching in the width direction of the belt 10. It is prevented. Further, due to the strength of the split rings 13, 14, even in the portion corresponding to the element 12, the split ring 13 and the split ring 14 do not move in the approaching direction. Therefore, in the element 12, the split rings 13, 14 arranged in the recess 16 can be prevented from coming out of the recess 16 by the retaining portion 18. Further, since the element 30 is provided with the pin 33, it is possible to prevent the split rings 13 and 14 from coming out of the recess 31. Therefore, it is possible to prevent the elements 12 and 13 from dropping from the endless ring 11. In Example 6, the number of the elements 30 and the arrangement interval of the elements 30 in the circumferential direction of the belt 10 are determined based on the strength in the width direction of the endless ring 11 or the amount of deflection. 30 is not good is set to a value that does not fall off the endless ring 11 or et al.

  Next, another configuration example of the belt 10 will be described based on Example 7 shown in FIG. The belt 10 described in the seventh embodiment is a belt corresponding to the invention of claim 1. In the seventh embodiment, the same components as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment. That is, in the seventh embodiment, the endless ring 10 is composed of divided rings 13, 14, and 100 that are divided into three in the width direction. Specifically, the split rings 13 and 14 are disposed on both sides of the endless ring 10 in the width direction, and the split ring 100 is disposed between the split ring 13 and the split ring 14. The split rings 13, 14, 100 are configured to be movable relative to each other in the circumferential direction. Furthermore, a pair of notches 20 are formed at locations corresponding to both sides in the width direction of the endless ring 11 in the split rings 13 and 14. The width of the split ring 100 is shorter than the distance L4 between the pair of retaining portions 18.

A method for manufacturing the belt 10 having the above configuration will be described. This manufacturing method is an embodiment corresponding to the invention of claim 4 . First, the division rings 13, 14, 100 are arranged in the width direction, and the circumferential phases of the division rings 13, 14 are set so that the pair of notches 20 are in the same position in the circumferential direction of the endless ring 11. Adjust. At this time, the width (minimum width) L17 of the endless ring 11 in the portion where the pair of cutout portions 20 is present is the contact surface of the split ring in the pillar portion 17 on one side and the retaining portion 18 on the opposite side. The split rings 13, 14, 100 are configured to be shorter than the distance L19 between the side ends. For this reason, the element 12 can be sequentially attached to the endless ring 11 in the same manner as in the first embodiment. Next, after all the elements 12 are attached to the endless ring 11, the split ring 13 and the split ring 14 are moved relative to each other in the circumferential direction, and the pair of notches 20 are different from each other in the circumferential direction of the endless ring 11. When arranged in the position, the assembly of the belt 10 is completed.

  Thus, when the assembly of the belt 10 is completed, the width (maximum width) L18 of the endless ring 11 in the portion where the pair of notch portions 20 is not present is larger than the interval L4 between the pair of retaining portions 18. Therefore, the element 12 can be prevented from falling off the endless belt 11. Further, in a state where tension is applied to the belt 10, the split ring 100 does not come out from between the split ring 13 and the split ring 14. Therefore, it is possible to prevent the split ring 13 and the split ring 14 from moving in the width direction of the belt 10 and in the approaching direction. Here, the correspondence between the configuration described in the seventh embodiment and the configuration of the present invention will be described. The split rings 13, 14, and 100 correspond to a plurality of split rings of the present invention. The correspondence relationship between the configuration described in the seventh embodiment and other configurations of the present invention is the same as the correspondence relationship between the configuration of the first embodiment and the configuration of the present invention.

  Next, another configuration example of the belt 10 will be described based on an eighth embodiment shown in FIG. The belt 10 described in the eighth embodiment is a belt corresponding to the invention of claim 1. In the eighth embodiment, the same components as those in the second embodiment are denoted by the same reference numerals as those in the second embodiment. That is, in the eighth embodiment, the endless ring 11A has divided rings 13A and 14A divided in the width direction, and the divided rings 13A and 14A each have a thin metal plate 15B laminated on the inner and outer circumferences. ing. Further, three split rings 15A and 15F are provided outside the split rings 13A and 14A. Here, the split ring 15B is configured by laminating a plurality of thin metal plates, and the split rings 15A and 15F are both configured by a single thin metal plate. Specifically, two split rings 15A and one split ring 15F are arranged in the width direction of the endless ring 11A. A split ring 15A is disposed on both sides of the endless ring 11A in the width direction, and a split ring 15F is disposed between the two split rings 15A. The three split rings 15A and 15F are configured to be relatively movable in the circumferential direction of the endless ring 11A. Furthermore, a pair of notches 20 are provided at locations corresponding to both sides of the two split rings 15A in the width direction of the endless ring 11A. The total width L19 of the three split rings 15A and 15F is longer than the distance L4 of the pair of retaining portions 18. Further, when the three split rings 15A and 15F are relatively moved so that the pair of cutout portions 20 are located at the same position in the circumferential direction of the endless ring 11A, the width of the portion where the pair of cutout portions 20 are present. L20 is configured to be shorter than the distance L21 between the contact surface of the pillar portion 17 on one side with the split ring and the side end portion of the retaining portion 18 on the opposite side.

A method for manufacturing the belt 10 having the above configuration will be described. This manufacturing method is an embodiment corresponding to the invention of claim 4 . First, the split rings 13A and 14A are arranged in the width direction, and the three split rings 15A and 15F are arranged outside the split rings 13A and 14A. Then, the two split rings 15A are moved relative to each other in the circumferential direction of the endless ring 11A, and are temporarily positioned so that the pair of notches 20 are in the same position in the circumferential direction of the endless ring 11A. Thereafter, in the same manner as in Example 1, the element 12 is attached to the endless ring 11A from locations corresponding to the pair of notches 20, and the element 12 is moved in the circumferential direction of the endless ring 11A. Thereafter, the same operation is repeated to attach all the elements 12 to the endless ring 11A. Next, the two split rings 15A are moved relative to each other in the circumferential direction of the endless ring 11A, and the split rings 15B are moved so that the pair of notches 20 are located at different positions in the circumferential direction of the endless ring 11A. Position.

  Thus, when the assembly of the belt 10 is completed, the width (maximum width) L19 of the endless ring 11A in the portion where the pair of notch portions 20 is not present is larger than the interval L4 between the pair of retaining portions 18. Therefore, the element 12 can be prevented from falling off the endless belt 11A. Further, in a state where tension is applied to the belt 10, the split ring 15F does not come out from between the split rings 15A. Therefore, the split rings 15A can be prevented from moving in the width direction of the belt 10 and in the approaching direction. Here, the correspondence between the configuration described in the eighth embodiment and the configuration of the present invention will be described. The three split rings 15A and 15F correspond to a plurality of split rings of the present invention. The correspondence relationship between the configuration described in the eighth embodiment and other configurations of the present invention is the same as the correspondence relationship between the configuration of the first embodiment and the configuration of the present invention.

  Next, another configuration example of the belt 10 will be described based on Example 9 shown in FIG. The belt 10 described in the ninth embodiment is a belt corresponding to the invention of claim 1. In the ninth embodiment, the same components as those in the third and eighth embodiments are denoted by the same reference numerals as those in the third and eighth embodiments. That is, in the ninth embodiment, the three split rings 15A and 15F described in the eighth embodiment are provided. Further, the ninth embodiment is different from the eighth embodiment in that each of the split rings 15A and 15F is composed of a plurality of thin metal plates. A pair of notches 20 are formed in all of the plurality of metal rings constituting the split ring 15A. Note that the notches 20 formed at the same edge in the width direction of the endless ring 11A are disposed at the same position in the circumferential direction of the endless ring 11A. Also in the ninth embodiment, the belt 10 is manufactured by the same method as in the eighth embodiment, and the same effect as in the eighth embodiment can be obtained.

  Next, another configuration example of the belt 10 will be described based on Example 10 shown in FIG. The belt 10 described in the tenth embodiment is a belt corresponding to the invention of claim 1. In the tenth embodiment, the same components as those in the fourth embodiment are denoted by the same reference numerals as those in the fourth embodiment. That is, in the tenth embodiment, three thin metal plates 15C, 15D, and 15G are provided on the outermost peripheral side of the endless ring 11C. Specifically, three metal thin plates 15C, 15D, 15G are arranged in the width direction of the endless ring 11C. Further, two thin metal plates 15C and 15D are disposed on both sides in the width direction of the endless ring 11C, and the thin metal plate 15G is disposed between the two thin metal plates 15C and 15D. Furthermore, a pair of notches 20 are provided at positions corresponding to both sides in the width direction of the endless ring 11C, that is, the metal thin plates 15C and 15D.

  The three metal thin plates 15C, 15D, and 15G are configured to be relatively movable in the circumferential direction of the endless ring 11C. The total width L21 of the three metal thin plates 15C, 15D, and 15G without the cutout portion 20 is longer than the distance L4 between the pair of retaining portions 18. Further, when the three thin metal plates 15C and 15D are relatively moved so that the pair of cutout portions 20 are located at the same position in the circumferential direction of the endless ring 11C, the width of the portion where the pair of cutout portions 20 are present. L22 is configured to be shorter than the distance L23 between the contact surface of the pillar portion 17 on one side with the split ring and the side end portion of the retaining portion 18 on the opposite side.

A method for manufacturing the belt 10 having the above configuration will be described. This manufacturing method is an embodiment corresponding to the invention of claim 4 . First, the three thin metal plates 15C, 15D, and 15G are disposed outside the thin metal plate 15E. Then, the two thin metal plates 15C and 15D are relatively moved in the circumferential direction of the endless ring 11C, and are temporarily positioned so that the pair of notches 20 are in the same position in the circumferential direction of the endless ring 11C. Thereafter, in the same manner as in Example 1, the element 12 is attached to the endless ring 11C from locations corresponding to the pair of notches 20, and the element 12 is moved in the circumferential direction of the endless ring 11C. Thereafter, the same operation is repeated to attach all the elements 12 to the endless ring 11C. Next, the two thin metal plates 15C and 15D are moved relative to each other in the circumferential direction of the endless ring 11C, and the pair of cutout portions 20 are located at different positions in the circumferential direction of the endless ring 11C. , 15D are positioned.

  Thus, when the assembly of the belt 10 is completed, the width (maximum width) L21 of the endless ring 11C in the portion where the pair of cutout portions 20 is not present is larger than the interval L4 between the pair of retaining portions 18. Therefore, it is possible to prevent the element 12 from dropping from the endless ring 11C. Further, in a state where tension is applied to the belt 10, the split ring 15G does not come out from between the metal thin plates 15C and 15D. Therefore, it is possible to prevent the metal thin plates 15C and 15D from moving in the width direction of the belt 10 and in the approaching direction. Here, the correspondence between the configuration described in the tenth embodiment and the configuration of the present invention will be described. The three metal thin plates 15C, 15D, and 15G correspond to a plurality of split rings of the present invention. The correspondence relationship between the configuration described in the tenth embodiment and other configurations of the present invention is the same as the correspondence relationship between the configuration of the first embodiment and the configuration of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front sectional view showing a state in which an endless belt for power transmission corresponding to Embodiment 1 of the present invention is wound around a drive pulley and a driven pulley. 1 is a schematic view of a belt-type continuously variable transmission in which an endless belt for power transmission according to the present invention is wound around a drive pulley and a driven pulley. It is a partial top view which shows the state which wound the endless belt for power transmission corresponded to Example 1 of this invention around a drive pulley and a driven pulley. It is front sectional drawing which shows the manufacturing process of the endless belt for power transmission corresponded to Example 1 of this invention. It is a partial top view which shows the manufacture process of the endless belt for power transmission corresponded to Example 1 of this invention. It is a top view which shows the other structural example of the split ring used with the endless belt for power transmission corresponded to Example 1 of this invention. It is front sectional drawing which shows the state which wound the endless belt for power transmission corresponded to Example 2 of this invention around a drive pulley and a driven pulley. It is front sectional drawing which shows the state which wound the endless belt for power transmission corresponded to Example 3 of this invention around a drive pulley and a driven pulley. It is front sectional drawing which shows the state which wound the endless belt for power transmission corresponded to Example 4 of this invention around a drive pulley and a driven pulley. It is front sectional drawing which shows the structure of the endless ring and element used in Example 5 and Example 6 as a reference example . It is front sectional drawing which shows the structure of the endless ring and element used in Example 5 as a reference example . It is a front sectional view showing the structure of the endless ring and elements used in Example 6 as reference example. It is front sectional drawing which shows the structure of the endless ring and element used in Example 7 of this invention. It is front sectional drawing which shows the structure of the endless ring and element used in Example 8 of this invention. It is front sectional drawing which shows the structure of the endless ring and element used in Example 9 of this invention. It is front sectional drawing which shows the structure of the endless ring and element used in Example 10 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Drive pulley, 3 ... Drive pulley, 10 ... Belt (power transmission belt), 11, 11A, 11C ... Endless ring, 12, 24, 30 ... Element, 13, 13A, 14, 14A, 15A, 15F, 100 ... Dividing ring, 15, 15C, 15D, 15G ... Thin metal plate, 16, 16A, 16B, 31 ... Recessed part, 18 ... Retaining part, 20 ... Notch part, 21 ... Contact surface, 26A, 26B ... Pin, 32 ... Middle Wall, 33 ... pin.

Claims (4)

The endless ring and a plurality of elements that are attached side by side in the circumferential direction of the endless ring, and a recess in which the endless ring is disposed is formed in the plurality of elements, and an opening portion of the recess is formed. At both ends, a pair of retaining portions spaced apart from each other so as to have an opening width narrower than the width of the concave portion is provided, and contact surfaces that contact the driving pulley and the driven pulley are formed on the plurality of elements, respectively. In the endless belt for power transmission,
The endless ring is composed of a plurality of divided rings divided in the width direction,
The plurality of split rings are configured to be relatively movable in the circumferential direction,
Said plurality of width of the endless width direction of each notch on the place corresponding to both edges are formed by split ring at a point where notch of which are formed of a ring in the split ring is narrower,
Wherein the width of the pair in a state where the position of the notch are coincident with each other widths the concave portion of the endless ring at the location of their notch on the circumference Direction endless ring and the width of the recess narrower than the dimension obtained by subtracting a half of the difference between the opening width, the width of the endless ring at the position of each notch is in a state where the position of the pair of cut-out portions in the circumferential direction endless ring are offset from each other An endless belt for power transmission, wherein the belt is narrower than a width of the concave portion and is equal to or larger than a size obtained by subtracting a half of a difference between the width of the concave portion and the opening width from the width of the concave portion.   By providing the second notch on the edge opposite to the edge where the notch is formed in the split ring where the notch is formed, the shape of both edges of the split ring is made symmetrical in the width direction. The endless belt for power transmission according to claim 1. Each of the split rings is configured by laminating a plurality of annular metal thin plates,
The notch is formed on at least the outermost metal thin plate of the outer peripheral metal thin plate,
The metal thin plate on the inner periphery side of the metal thin plate in which the notch is formed is configured such that the width as an endless ring formed by these metal thin plates is narrower than the opening width.
Dynamic force transmitting endless belt according to claim 1 or 2, characterized in that. An endless ring and a plurality of elements having a recess are prepared, and a pair of retaining portions having an opening width that is narrower than the width of the recess are provided at both ends of the opening portion of the recess, A contact surface that contacts the driving pulley and the driven pulley is formed, and the endless ring is inserted through the opening through the opening, and the elements are arranged side by side in the circumferential direction of the endless ring to transmit power. Assembling an endless belt for use in manufacturing a power transmission endless belt,
  Preparing a plurality of divided rings obtained by dividing the endless ring in the width direction, and providing a pair of notches at locations corresponding to both edges in the width direction of the endless ring in the plurality of divided rings;
  The plurality of split rings are aligned in the width direction, and the positions of the endless rings in the circumferential direction of the pair of notches are made to coincide with each other so that the width of the endless ring at the positions of these notches is determined from the width of the recess. A first step of narrowing a dimension less than half the difference between the width of the recess and the opening width;
  Following this first step, the endless ring is inserted into the recess by passing the pair of notches from between a pair of retaining portions in the element, and the element and the plurality of split rings And a second step of attaching the plurality of elements in the circumferential direction of the plurality of split rings;
  Following this second step, the positions of the pair of notches in the circumferential direction of the endless ring are moved relative to each other so that the positions of the pair of notches in the circumferential direction are different from each other. Assembling the power transmission endless belt with the width of the endless ring at a position narrower than the width of the recess and not less than half the difference between the width of the recess and the width of the opening. A third step to complete
A process for producing an endless belt for power transmission, comprising:

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