JP2006064014A - Pressure belt, and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure belt, in which layered length of elements and center distance between pulleys coincide with each other even when thickness of the elements is dispersed. <P>SOLUTION: This device comprises an annular carrier 5, and a number of elements 6 (6A and 6B) layered in the circumferential direction of the carrier 5, and a pressure belt 4 is wrapped around the pulleys 2 and 3 for transmission of power between the pulleys 2 and 3 by pressing force of the elements 6 to each other. In a case where it is equally parted into a plurality of sections in the circumferential direction, at least one of the sections includes a part where the layered length L1 of the elements 6 coincide with the center distance CD between the pulleys 2 and 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pressure belt wound around a plurality of pulleys and a method for manufacturing the same.

  Generally, a transmission device used when power is transmitted between two rotating members includes a friction transmission device, a gear transmission device, a winding transmission device, and the like, and the distance between the axes of the two rotating members is long. In some cases, a belt transmission is used. Such a belt transmission device is used in, for example, a continuously variable transmission for a vehicle, and an example of a belt used in the continuously variable transmission is described in Patent Document 1. This Patent Document 1 has two pulleys with variable V-shaped groove intervals and a V-belt wound around these pulleys. The V-belt has many ring plates endlessly formed by pins. A number of friction blocks are assembled to the connected one.

Further, when the range of the gear ratio used is about 1.6 for the maximum gear ratio and about 1 / 1.6 for the minimum gear ratio, the distance between the shafts of the two pulleys is the distance between the pins of the V belt. It is described that the distance is set to n (n is a natural number) times. With such a configuration, when the friction block is in contact with the pulley and the speed ratio range is set to about 1 / 1.6 to about 1.6, the axial excitation force is a relatively small value over the entire range. In particular, the value is very small near the gear ratio of 1.0, and the noise level generated by the V-belt continuously variable transmission is said to be reduced. Note that a pressing belt that transmits power by a pressing force between elements is also described in Patent Document 2 and Patent Document 3 below.
JP-A-1-153852 JP 2002-48194 A JP-A 64-55447

  By the way, in the pressing belt described in the above-mentioned Patent Document 1, it is conceivable to configure the friction block so as to contact the pulley. However, in the case of Patent Document 1, since the inter-pin distance of the pulley is matched with the inter-pin distance of the V belt, if the friction block thickness varies in the circumferential direction of the winding member, The distance between the axes may not be n times the distance between the pins of the V belt. As a result, the winding phase of each friction block differs in the circumferential direction of each pulley, which may reduce the vibration or noise reduction effect.

  The present invention has been made against the background described above, and provides a pressing belt capable of matching the stacking length of elements and the distance between pulley axes even when the thickness of the elements varies. The purpose is that.

  In order to achieve the above object, the invention of claim 1 has an annular carrier and a plurality of elements stacked in the circumferential direction of the carrier, wound around a plurality of pulleys, In a pressing belt that transmits power between a plurality of pulleys by the pressing force between the elements, when equally divided into a plurality of regions in the circumferential direction, the stacking length of the elements and the distance between the axes of the pulleys are The matching part is included in at least one of the plurality of regions.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, a portion where the stacking length of the elements coincides with the distance between the axes of the pulleys is included in all of the plurality of regions. It is what.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, a region including a portion where the stacking length of the elements and the inter-axis distance of the pulley coincide with each other has a different thickness in the circumferential direction. It has a plurality of types of elements.

  According to a fourth aspect of the present invention, in addition to the configuration of the third aspect, the plurality of types of elements include a first element and a second element that is used less in the circumferential direction than the first element. And the second elements are arranged at predetermined intervals in the circumferential direction.

  The invention according to claim 5 manufactures a pressing belt that transmits power among a plurality of pulleys by the pressing force of a large number of elements by stacking and attaching a large number of elements in the circumferential direction of the annular carrier. In the method for manufacturing a pressure belt, when the pressure belt is equally divided into a plurality of regions in the circumferential direction, a portion where the lamination length of the elements and the inter-shaft distance of the pulley coincide with each other is at least of the plurality of regions. A plurality of elements are attached to the carrier so as to be included in one.

  In the invention of claim 6, by transmitting a plurality of types of elements having different thicknesses in the circumferential direction of the annular carrier and attaching them, power is transmitted between the plurality of pulleys by the pressing force between the stacked elements. In the press belt manufacturing method for manufacturing the press belt, the thickness and the stacking length of the first element in the circumferential direction of the press belt when the press belt is equally divided into a plurality of regions in the circumferential direction. The thickness and number of the second elements are determined based on the thickness, so that at least one region including a portion in which the stacked lengths of the plurality of types of elements and the inter-axis distances of the plurality of pulleys coincide with each other is included. A plurality of types of elements are attached to the carrier as formed.

  According to a seventh aspect of the invention, in addition to the configuration of the sixth aspect, the thickness and the number of the second elements are determined based on the thickness and the lamination length of the first elements in the circumferential direction of the pressing belt. By attaching the plurality of types of elements to the carrier, the portion where the stacked lengths of the plurality of types of elements and the distances between the axes of the plurality of pulleys coincide with each other is included in all of the plurality of regions. It is characterized by.

  According to an eighth aspect of the invention, in addition to the configuration of the sixth aspect, the second elements are arranged at a predetermined interval in the circumferential direction of the pressing belt.

  According to the pressing belt described in claim 1 and the pressing belt manufactured by the manufacturing method according to claim 5, the pressing belt is wound around a plurality of pulleys, and the torque of one pulley is applied between the elements. It is converted into pressure and transmitted to the other pulley. Even when the thickness of the element itself varies, it is possible to make the stacking length of the elements coincide with the distance between the axes of the pulleys by stacking elements having different thicknesses. For this reason, it is possible to make the winding phase of the element in the circumferential direction of each pulley correspond. Therefore, it is possible to prevent one pulley from rotating at a constant speed and causing fluctuations in rotation at the other pulley, and to suppress vibration or noise. Furthermore, in a plurality of regions where the pressure belt is equally divided in the circumferential direction, the number of stacked elements is reduced, so that the amount of accumulated variation is reduced, making it easy to match the stacked length of the elements with the distance between the pulley axes. Become.

  According to the invention of claim 2, in addition to obtaining the same effect as that of the invention of claim 1, it becomes easy to match the winding phases of the elements in the pulleys over the entire circumference of the pressing belt.

  According to the invention of claim 3, in addition to obtaining the same effect as that of the invention of claim 1 or 2, the pressure belt has a plurality of types of elements having different thicknesses in the circumferential direction. It becomes easier to make the stacking length match the distance between the axes of the pulleys.

  According to the invention of claim 4, in addition to obtaining the same effect as that of the invention of claim 3, “a period during which vibration or noise is generated by the rotation of the pressing belt” can be shortened.

  According to the invention of claim 6, the pressing belt is wound around the plurality of pulleys, and the torque of one pulley is converted into the pressing force between the elements and transmitted to the other pulley. Even when the thickness of the element itself varies, it is possible to make the stacking length of the elements coincide with the distance between the axes of the pulleys by stacking elements having different thicknesses. For this reason, it is possible to make the winding phase of the element in each pulley correspond. Therefore, it is possible to prevent one pulley from rotating at a constant speed and causing fluctuations in rotation at the other pulley, and to suppress vibration or noise. In addition, in at least one of the plurality of regions, by determining the thickness and the number of the second elements based on the thickness and the stacking length of the first elements in the circumferential direction, A portion in which the stacking length of the elements is matched with the distance between the axes of the pulleys is included. Therefore, it becomes easier to make the stacking length of the elements coincide with the distance between the axes of the pulleys.

  According to the invention of claim 7, in addition to obtaining the same effect as that of the invention of claim 6, it becomes easy to make the stacking lengths of all kinds of elements coincide with the interaxial distance of the pulley.

  According to the invention of claim 8, in addition to obtaining the same effect as that of the invention of claim 6, the “period in which vibration or noise is generated by the rotation of the pressing belt” can be shortened.

  Next, the present invention will be specifically described with reference to the drawings. FIG. 1 is a conceptual diagram showing an example in which the present invention is applied to a belt type continuously variable transmission 1 for a vehicle. The belt type continuously variable transmission 1 includes a driving side rotating member (primary pulley) 2 connected to a driving force source (not shown) side and a driven side rotating member (secondary) connected to a wheel (not shown) side. Pulley) 3. The driving side rotating member 2 and the driven side rotating member 3 are each provided with a V-shaped belt mounting groove. And it is comprised so that the width | variety of the belt attachment groove | channel of the drive side rotation member 2 and the driven side rotation member 3 can each be adjusted.

  A pressing belt (hereinafter abbreviated as “belt”) 4 is wound around the driving side rotating member 2 and the driven side rotating member 3 configured as described above. The belt 4 has an endless shape, in other words, an annular shape. Specifically, the belt 4 has a belt-like hoop 5 and a large number of elements 6 attached in the circumferential direction of the hoop 5. Each element 6 is made of a metal material, and recesses 7 are formed on both sides of the element 6 in the width direction of the belt 4. The hoop 5 is disposed in the recess 7. Further, the element 6 is formed with contact surfaces 8 and 9 which are directed opposite to each other in the circumferential direction of the belt 4. And many elements 6 are laminated | stacked on the circumferential direction in the state which the contact surface 8 and the contact surface 9 of the adjacent element 6 contact. Further, a protrusion 10 is formed on one contact surface 8, and a recess 11 is formed on the other contact surface 9. Then, when the protruding portion 10 enters the recessed portion 11, the relative movement of the elements 6 along the contact surfaces 8 and 9 is restricted. Further, an inclined surface 12 is formed on the inner peripheral side of the belt 4 continuously to the contact surface 8, and a linear shape extending in the width direction of the belt 4 at a boundary portion between the contact surface 8 and the inclined surface 12. The rocking edge (corner part) 13 is formed.

  In the configuration described above, the torque of the driving force source is transmitted to the driving side rotating member 2 and the width of the belt mounting groove of the driving side rotating member 2 is controlled so that the winding radius of the belt 4 with respect to the driving side rotating member 2 is increased. And the ratio of the wrapping radius of the belt 4 to the driven side rotating member 3 changes, and the ratio between the rotational speed of the driving side rotating member 2 and the rotational speed of the driven side rotating member 3, that is, the gear ratio is controlled. Further, by controlling the width of the belt mounting groove of the driven side rotating member 3, the clamping pressure of the driving side rotating member 2 and the driven side rotating member 3 with respect to the belt 4 is adjusted, and the transmission torque of the belt 4 is controlled.

  The frictional force on the contact surface between each element 6 and each rotating member changes according to the clamping pressure applied to the belt 4, more specifically, the clamping pressure applied to each element 6. As shown in FIG. 1, when the driving side rotating member 2 rotates counterclockwise and power is transmitted from the driving side rotating member 2 to each element 6, each element 6 extends in the circumferential direction of the belt 4. While the force which presses each other generate | occur | produces, the pressing force is transmitted to the driven side rotation member 3 via each element 6, and the driven side rotation member 3 rotates counterclockwise in FIG. In this way, the torque of the driving side rotating member 2 is transmitted to the driven side rotating member 3 via the belt 4, and the torque of the driven side rotating member 3 is transmitted to the wheels to generate a driving force.

  By the way, when power is transmitted by the belt 4, each element 6 is in a state where the contact surface 8 and the contact surface 9 of the adjacent element 6 are in contact with each other in a region where each element 6 is not wound around each rotating member. 6 moves (translates) substantially linearly in the circumferential direction. On the other hand, when the belt 4 is wound around the rotating member, each element 6 moves along a substantially arc-shaped locus. More specifically, the element 6 positioned forward in the moving direction rotates a predetermined angle with the rocking edge 13 of the element 6 positioned rearward in the moving direction as a fulcrum. As a result, the contact surface 8 and the contact surface 9 are not in contact with each other. Next, when the belt 4 wound around the rotating member is separated from the rotating member, each element 6 rotates again with the rocking edge 13 as a fulcrum, and the contact surface 8 and the contact surface 9 of each element 6 come into contact with each other. Return to state.

  Next, a specific laminated structure of the element 6 will be described. A plurality of elements 6 are laminated and attached to the belt 4 in the circumferential direction of the hoop 5. 1 and 2, when the belt 4 is equally divided into a plurality of regions in the circumferential direction (integer n is equally divided), the laminated length L1 of the plurality of elements 6 and the shaft A portion where the inter-space distance CD coincides is included in at least one of the plurality of regions. In this embodiment, “the belt 4 is equally divided into a plurality of regions in the circumferential direction” means that the belt 4 as a product is divided at a certain position in the circumferential direction and is equally divided into a plurality of regions. It does not mean that the belt 4 is actually disassembled, disassembled, or cut. Here, the stacking length L1 of the element 6 means the distance from the contact surface 8 to the contact surface 9 of the predetermined element 6. The inter-axis distance CD means the distance between the rotation center A1 of the driving side rotation member 2 and the rotation center B1 of the driven side rotation member 3. Furthermore, the plurality of regions may be three or more regions. FIG. 2 is a conceptual diagram showing an example in which the belt 4 is equally divided. In FIG. 2, the belt 4 is equally divided into four regions C1 to C4.

  Each circumferential length Ld of the region C1 to the region C4 is ¼ of the total circumferential length of the belt 4. Here, each circumferential length Ld and the total circumferential length of the belt 4 are the lengths in a virtual circle (not shown) connecting the locking edges 13 of each element 6. Further, as the configuration of the belt 4, the configuration in which the circumferential lengths Ld of the regions C1 to C4 are equal to the interaxial distance CD, or the circumferential lengths Ld of the regions C1 to C4 are the interaxial distances CD. Any longer configuration may be used. In FIG. 1, the belt 4 having a configuration in which each circumferential length Ld of the region C1 to the region C4 is longer than the inter-axis distance CD is illustrated.

  According to the belt 4 configured as described above, even when the thickness of the element 6 itself varies, it is possible to make the stacking length L1 of the element 6 coincide with the inter-axis distance CD. For this reason, it is possible to make the winding phase of the element 6 in the circumferential direction of each drive side rotation member 2 and the driven side rotation member 3 coincide. Accordingly, it is possible to avoid the drive-side rotating member 2 from rotating at a constant speed and causing fluctuations in the rotation of the driven-side rotating member 3, and to suppress vibration and noise caused by the collision between the driven-side rotating member 3 and the element 6. Can do. Further, in the regions C1 to C4 in which the belt 4 is equally divided in the circumferential direction, the number of stacked elements 6 is reduced, so that the accumulated amount of variation is reduced, the stacked length L1 of the elements 6 and the inter-axis distance CD. It becomes easy to match. Further, when the portion where the stacking length L1 of the element 6 and the inter-axis distance CD are matched is included in all of the regions C1 to C4, the drive side rotation is performed over the entire circumference of the belt 4. It becomes easier to make the winding phases of the elements 6 in the member 2 and the driven side rotating member 3 coincide with each other. That is, in order to avoid the phase shift of the element 6 in each rotating member, it is not necessary to manage the thickness of the element 6 in units of several microns, and the cost can be greatly reduced.

  In the example of FIG. 2, the belt 4 is divided into four equal parts. However, the belt 4 is divided into five equal parts, and at least one of the divided areas has an element stacking length and an inter-axis distance. It is also possible to produce a belt with matching parts. Further, when the number of belt divisions is selected, a value obtained by dividing the belt circumferential length L by the inter-axis distance CD is calculated, and if the calculated value is an integer, the calculated value can be used as the division number. It is. On the other hand, if the calculated value is not an integer, use either an integer larger or smaller than this calculated value as the division number, or use the integer closest to this calculated value as the division number. Is possible. Even in the belt configured as described above, the same effect as described above can be obtained.

  Next, a method for matching the stacking length L1 of the element 6 with the inter-axis distance CD will be specifically described. When constructing a belt in which the lamination length L1 of the element 6 is matched with the inter-axis distance CD, a belt in which only one kind of element having the same thickness is laminated and a plurality of kinds of elements having different thicknesses are laminated. Belt. By using a plurality of types of elements having different thicknesses, the stacking length of the elements and the distance between the axes can be more easily matched. 1 and 2 show a belt 4 in which a plurality of types of elements having different thicknesses are stacked. That is, the element 6 includes the main element 6A and the adjustment element 6B having a thickness different from that of the main element 6A to constitute the belt 4. The adjustment element 6B may be thicker or thinner than the main element 6A.

  More specifically, in FIG. 2, a portion where the stacking length of the elements and the inter-axis distance coincide is included in all of the regions C1 to C4, and the stacking length of the elements and the axis in each region are included. The laminated portion 14 of the adjustment element 6B is included in the portion where the inter-space distance matches. Here, the configuration (method) for adjusting the stacking length L1 of the elements 6 in one region using the main element 6A and the adjustment element 6B includes the following methods. The first method is a method in which the thickness of the main element 6A is measured, and the number and thickness of the adjustment elements 6B formed by the same molding die are determined based on the average thickness.

  By the way, each of the elements 6A and 6B is individually manufactured in large numbers by different molding dies. Therefore, the second method measures the average thickness of the elements molded by each mold, and determines the stacking length L1 of the elements 6 when the main element 6A and the adjustment element 6B are mixed and used. This is a method of determining the number of molds to be used and the number of elements to be molded with the mold so as to be equal to the inter-axis distance CD.

  Further, the third method uses a main element 6A molded with a plurality of molds, measures the average thickness of these main elements 6A, and based on the measurement result, determines the number of adjustment elements 6B and This is a method for determining the thickness.

  As described above, according to the first to third methods, with the forming die as a reference, a large number of elements manufactured by the forming die are set as one lot, and the stacking length L1 of the elements is adjusted in units of the lot. It is not necessary to adjust the stacking length L1 of the elements for every belt 4, and the belt 4 having the above-described configuration can be obtained at low cost.

  In the fourth method, the divided area is configured by only the main element 6A, the stacking length L1 is actually measured, and the thickness and the number of the adjustment elements 6B are determined based on the measurement result. Is the method.

  Next, an arrangement example of the adjustment element 6B in each region and an arrangement example of the adjustment element 6B in the entire circumference of the belt 4 will be described. First, the first arrangement example is an example in which the laminated portion 14 of the adjustment element 6B is arranged at the center of each region in the circumferential direction of the belt 4. According to the first arrangement example, it is possible to minimize the noise increase time due to the phase shift of the element 6 between the driving side rotating member 2 and the driven side rotating member 3. Therefore, the noise level can be lowered.

  The second arrangement example is an example in which the laminated portions 14 of the adjustment elements 6B are randomly arranged in the region in the circumferential direction of the belt 4. In the third arrangement example, the arrangement position of the laminated portion 14 of the adjustment element 6B is determined so that the length of the laminated portion of the main element 6A is alternately long, short, long, and short in the circumferential direction. It is an example of arrangement. The fourth arrangement example is an arrangement example in which the arrangement position of the laminated portion 14 of the adjustment element 6B is determined so that the length ratio between the laminated portions of the main element 6A is different by 30% or more. The fifth arrangement example is an arrangement example in which the arrangement position of the laminated portion 14 of the adjustment element 6B is determined so that the length ratio between the laminated portions of the main element 6A is random. According to these second to fifth arrangement examples, by randomizing the period in which the noise is generated in the phase in the circumferential direction of the belt 4, the noise becomes inconspicuous and the noise can be further reduced. is there. Furthermore, in the sixth arrangement example, the region LD is intended for the belt 4 that is longer than the stacking length L1, and a portion other than the portion corresponding to the inter-axis distance CD in the region Ld. This is an arrangement example in which the adjustment element 6B is arranged. In each arrangement example, the number of main elements 6A is larger than the number of adjustment elements 6B in each region unit or the entire belt 4.

  Next, the relationship between the phase difference of the element 6 between the driving side rotating member 2 and the driven side rotating member 3 and belt noise will be described with reference to the diagram of FIG. A phase difference of “zero” means that there is no phase difference, and a phase difference of ½ means that there is a phase difference of ½ of the thickness of the element 6. As can be seen from the diagram of FIG. 3, the belt noise increases as the phase difference increases.

  FIG. 4 is a diagram showing the relationship between the phase difference and the element thickness. Here, a case where 100 elements having a distance between the axes of 180 mm and a target thickness of 1.80 mm are stacked is illustrated. On the other hand, when 100 elements having an actual thickness of 1.79 mm are stacked, the phase difference is 0.5 (1/2). That is, the phase difference is 0.5 due to an error of 10 μm per element. FIG. 5 is a diagram showing the relationship between the phase difference and the circumference of the belt 4. FIG. 5 corresponds to the case where the laminated portion 14 of the adjustment element 6B is arranged at the center in the circumferential direction in each of the regions C1 to C4 as shown in FIG. As shown in FIG. 5, there may be a portion where the phase difference cannot be completely adjusted in the approximate center within ¼ of the circumference. However, since the circumference in which the phase difference occurs is short and the appearance time in which the phase difference occurs is also short, the increase in the noise level is small.

  Here, the correspondence between the configuration described in this embodiment and the configuration of the present invention will be described. The driving side rotating member 2 and the driven side rotating member 3 correspond to a plurality of pulleys of the present invention, and the belt 4 is Corresponding to the pressing belt of the present invention, the main element 6A and the adjusting element 6B correspond to “a plurality of types of elements having different thicknesses” of the present invention, and the main element 6A corresponds to the first element in the present invention. The adjustment element 6B corresponds to the second element in the present invention.

It is a conceptual diagram which shows the belt-type continuously variable transmission which has a pressing belt of this invention. It is a conceptual diagram which shows the structure of the press belt of this invention. It is a diagram which shows an example of the relationship between the phase difference of the element between each rotation member, and a noise level. It is a diagram which shows an example of the relationship between the phase difference of the element between each rotation member, and the thickness of an element. It is a diagram which shows the example of a change of the phase difference with respect to the circumference of a press belt, and noise.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Drive side rotation member, 3 ... Driven side rotation member, 4 ... Belt (press belt), 5 ... Carrier, 6 ... Element, 6A ... Main element, 6B ... Adjustment element, C1, -C4 ... Area | region, L1 ... Lamination length, CD: Distance between axes.

Claims (8)

It has an annular carrier and a large number of elements stacked in the circumferential direction of the carrier, wound around a plurality of pulleys, and transmits power between the plurality of pulleys by the pressing force of the numerous elements. In the pressing belt
When equally divided into a plurality of regions in the circumferential direction, a portion where the lamination length of the elements and the inter-shaft distance of the pulley coincide with each other is included in at least one of the plurality of regions. Press belt.   2. The pressing belt according to claim 1, wherein a portion where the lamination length of the elements and the inter-axis distance of the pulley coincide is included in all of the plurality of regions.   The region including a portion where the stacking length of the elements coincides with the distance between the axes of the pulleys includes a plurality of types of elements having different thicknesses in the circumferential direction. 2. A pressing belt according to 2.   The plurality of types of elements include a first element and a second element that is used less in the circumferential direction than the first element. In the circumferential direction, the second element The pressing belt according to claim 3, wherein the elements are arranged at predetermined intervals. In the manufacturing method of a pressing belt for manufacturing a pressing belt that transmits power between a plurality of pulleys by pressing the multiple elements by stacking and attaching a large number of elements in the circumferential direction of the annular carrier,
When the pressing belt is equally divided into a plurality of regions in the circumferential direction, a portion where the lamination length of the elements and the inter-axis distance of the pulley coincide with each other is included in at least one of the plurality of regions. A method of manufacturing a pressing belt, wherein a number of elements are attached to the carrier. By stacking and attaching multiple types of elements with different thicknesses in the circumferential direction of the annular carrier, a pressing belt that transmits power between the multiple pulleys is manufactured by the pressing force between the stacked elements. In the manufacturing method of the pressing belt,
When the pressing belt is equally divided into a plurality of regions in the circumferential direction, the thickness and the number of second elements are determined based on the thickness and the stacking length of the first elements in the circumferential direction of the pressing belt. Are determined so that at least one region including a portion in which the stacking lengths of the plurality of types of elements and the inter-axis distances of the plurality of pulleys coincide with each other is formed on the carrier. A method for manufacturing a pressing belt, wherein the pressing belt is attached.   By determining the thickness and number of the second elements based on the thickness and the stacking length of the first elements in the circumferential direction of the pressing belt, the stacking lengths of a plurality of types of elements and the plurality of pulleys are determined. The method for manufacturing a pressing belt according to claim 6, wherein a plurality of types of elements are attached to the carrier such that a portion where the distance between the axes coincides is included in all of the plurality of regions.   The method for manufacturing a press belt according to claim 6, wherein the second elements are arranged at a predetermined interval in a circumferential direction of the press belt.

Images