JP2006183850A - Block for belt and its forming method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a block forming method suppressing the deformation of a contact surface formed at a block for a belt. <P>SOLUTION: In the method of forming the block 14 constituting the belt wound around a plurality of pulleys and provided with a contact surface 26 contacting the pulley, a plate-like material 50 is pressurized in the thickness direction to perform forming processing, and the plate-like material 50 is blanked to form the block 14. In this case, a recess 27A with a depth in the thickness direction of the plate-like material 50 is formed in a region to be blanked as the block, of the plate-like material 50, and then the plate-like material 50 formed with the recess 27A is pressurized in the thickness direction to perform forming processing. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a block constituting a transmission belt and a method for forming the block, and more particularly to a block formed by pressing a plate-shaped material and a method for forming a block by punching the plate-shaped material.

  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 winding transmission is used. An example of a transmission V belt used in such a winding transmission device is described in Patent Document 1. The power transmission belt described in Patent Document 1 is formed of two sets of endless layered bands and a number of blocks in which support grooves for supporting the layered bands are formed at both ends. Block inclined surfaces are formed on both ends of the block, and V-groove inclined surfaces are formed on the V-type pulley. On the other hand, an oil groove is formed on the contact surface of the block that contacts the layered band. In addition, a lubricating oil supply groove is formed on a contact surface of the block that contacts an adjacent block, and the lubricating oil supply groove and the oil groove are connected to each other.

The transmission V belt is wound around a set of pulleys to transmit power. That is, a frictional force is generated between the block inclined surface and the V-groove inclined surface by the narrow pressure applied to the block from the V-type pulley on the driving side, and the compressive force acting between the blocks is held by the frictional force. The power is transmitted to the driven V-type pulley. On the other hand, when the transmission V belt is wound around a set of V-shaped pulleys, a speed difference is generated between the layered band and the block as the transmission V belt rotates, and the two members move relative to each other. However, since the lubricating oil is supplied to the oil groove via the lubricating oil supply groove, the frictional force due to the relative movement between the layered band and the block is reduced, and the transmission efficiency of the transmission V-belt can be improved. It is supposed to be. Patent Documents 2 and 3 below describe belt elements for continuously variable transmissions and elements forming methods. Patent Documents 2 and 3 describe a process of forming an element by pressing a plate material.
JP-A-5-272594 JP 2003-247605 A JP 2001-50353 A

  By the way, in the above-mentioned Patent Document 1, there is no description about the block manufacturing method. However, when manufacturing the block described in Patent Document 1, the block is punched from the plate-like material, and then the block is pressed. If the lubricating oil supply groove is formed on the contact surface of the block, a part of the material flows toward the block inclined surface side by the pressure applied to form the lubricating oil supply groove, and the block inclined surface There was a risk of deformation.

  The present invention has been made against the background described above, and it is an object of the present invention to provide a block molding method capable of suppressing deformation of a contact surface formed on a belt block.

  In order to achieve the above object, the invention according to claim 1 is a belt block comprising a belt wound around a plurality of pulleys and having a contact surface in contact with the pulleys. Then, after the concave portion is formed, the plate-like material is pressed to form a contact surface.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the concave portion remains after the contact surface is molded.

  According to the invention of claim 3, when forming a block that comprises a belt wound around a plurality of pulleys and that has a contact surface that contacts the pulleys, a plate material is pressed in the thickness direction to form the block. And forming the block by punching out the plate-like material, and in the region of the plate-like material that is planned to be punched out as the block, A concave portion having a depth in the thickness direction is formed, and then the plate-like material on which the concave portion is formed is pressed in the thickness direction to perform a forming process.

  According to a fourth aspect of the invention, in addition to the configuration of the third aspect, the concave portion is left in the block after punching.

  According to the first aspect of the present invention, since the contact surface of the belt block is formed after the concave portion is formed in the plate-shaped material, the material that flows by the pressure applied when the plate-shaped material is formed is It flows to reduce the volume. For this reason, it is avoided that a material flows so that a contact surface may protrude. Therefore, it can suppress that the contact surface of a block deform | transforms, ie, the shape of a contact surface becomes a shape different from an expected shape.

  According to the invention of claim 2, in addition to obtaining the same effect as that of the invention of claim 1, since the recess remains in the belt block, when a belt is formed by laminating a large number of blocks, Lubricating oil can be held in the recess.

  According to the invention of claim 3, after forming the concave portion in the thickness direction in the plate-shaped material, the plate-shaped material is pressed in the thickness direction to perform the molding processing (press processing). The material that flows under pressure flows to reduce the volume of the recess. For this reason, it is avoided that a material flows so that a contact surface may protrude. Therefore, it can suppress that the contact surface of a block deform | transforms, ie, the shape of a contact surface becomes a shape different from an expected shape.

  According to the invention of claim 4, in addition to obtaining the same effect as that of the invention of claim 1, since the recess remains in the block after punching, when a belt is formed by stacking a large number of blocks, the block Lubricating oil can be held in the recesses.

  Next, the present invention will be specifically described with reference to the drawings. FIG. 2 is a conceptual diagram illustrating an example of a belt type continuously variable transmission 1 for a vehicle. The continuously variable transmission 1 has a primary pulley 2 connected to a driving force source (not shown) side and a secondary pulley 3 connected to a wheel (not shown) side. The primary pulley 2 includes a fixed body 5 that cannot move in the axial direction of the rotating shaft 4 and a movable body 6 that can move in the axial direction of the rotating shaft 4. The fixed body 5 is formed with an annular contact surface 5A, and the movable body 6 is formed with an annular contact surface 6A. A V-shaped belt attachment groove 7 is formed between the contact surface 5A and the contact surface 6A. On the other hand, the secondary pulley 3 has a fixed body 9 that cannot move in the axial direction of the rotary shaft 8 and a movable body 10 that can move in the axial direction of the rotary shaft 8. The fixed body 9 is formed with an annular contact surface 9A, and the movable body 10 is formed with an annular contact surface 10A. A V-shaped belt attachment groove 11 is formed between the contact surface 9A and the contact surface 10A. And it is comprised so that the width | variety of the belt attachment grooves 7 and 11 can each be adjusted by operating the movable bodies 6 and 10 to an axial direction, respectively by the actuator which is not shown in figure.

  A power transmission endless belt (hereinafter abbreviated as a belt) 12 is wound around the primary pulley 2 and the secondary pulley 3 configured as described above. The belt 12 has an endless shape, in other words, an annular shape, and the configuration of the belt 12 will be specifically described. The belt 12 has an endless carrier 13 and a number of blocks (elements) 14 attached over the entire circumferential direction of the carrier 13. The carrier 13 is formed by laminating a plurality of band-like hoops (not shown) made of a flexible metal material on the inner and outer peripheries. Each block 14 is made of a metal material, and is laminated so that adjacent blocks 14 in the circumferential direction of the belt 12 are in contact with each other. As a metal material constituting each block 14, iron (Fe), carbon tool steel (SK), alloy tool steel (SKS), or the like can be used.

  A single configuration of the block 14 will be described with reference to FIGS. FIG. 3 is a front view of the block 14, and FIG. 4 is a side view of the block 14. The horizontal direction in FIG. 3 corresponds to the width direction of the belt 12. For convenience, the horizontal direction of the block 14 in FIG. 3 is referred to as the width direction of the block 14, and the vertical direction of the block 14 in FIG. 3 is referred to as the height direction of the block 14. Further, the left-right direction in FIG. 4 corresponds to the thickness direction of the block 14. The block 14 has a trunk portion 15, a neck portion 16, and a head portion 17, and the neck portion 16 is disposed between the head portion 17 and the trunk portion 15 in the vertical direction of the block 14. The body 15 is connected to the neck 16. A first contact surface 18 and a second contact surface 19 are formed on both sides of the block 14 in the stacking direction. The first contact surface 18 and the second contact surface 19 are surfaces constituting the front and back in the stacking direction of the blocks 14, in other words, in the thickness direction, and the first contact surface 18 and the second contact surface 19 Are parallel. In addition, the first contact surface 18 and the second contact surface 19 are formed across the trunk portion 15, the neck portion 16, and the head portion 17.

  A dimple (projection) 20 having a protruding amount in the thickness direction of the block 14, that is, in the left-right direction in FIG. 4 is formed on the first contact surface 18 of the head portion 17. As shown in FIG. 3, the shape of the dimple 20 when the block 14 is viewed from the front is substantially circular. On the other hand, a hole (concave portion) 21 having a depth in the thickness direction of the block 14, that is, the horizontal direction in FIG. 4 is formed in the second contact surface 19 of the head portion 17. When the block 14 is viewed from the back, the shape of the hole 21 is substantially circular. The inner diameter of the hole 21 is set larger than the outer diameter of the dimple 20. In the width direction of the belt 12, the width of the head portion 17 is set to be narrower than the width of the body portion 15 and wider than the width of the neck portion 16. Due to the corresponding relationship between the width of the body 15, the width of the neck 16, and the width of the head 17, Two carrier accommodating portions 22 are formed between the portion 15 and the head portion 17. The carriers 13 are respectively disposed in the two carrier accommodating portions 22.

  On the other hand, the body portion 15 is formed with an inclined surface 23 that is continuous with the first contact surface 18. Further, a flat surface 81 is formed below the inclined surface 23 with the stepped portion 80 interposed therebetween. As shown in FIG. 4, the thickness of the block 14 is such that the lower the block 14, that is, the thickness of the inclined surface 23 decreases as the inclined surface 23 approaches the stepped portion 80. Is set. A rocking edge 24 extending in a substantially straight line along the width direction of the belt 12 is formed at the boundary between the first contact surface 18 and the inclined surface 23. Further, a curved surface 25 that is curved so as to protrude upward is formed on the lower end side of the block 14. Specifically, curved surfaces 25 are formed at two locations in the width direction of the block 14. Contact surfaces 26 are formed at both ends of the block 14 in the width direction. The contact surface 26 is inclined in a direction in which the width of the block 14 is narrowed as it goes to the lower side of the block 14 in FIG. 3. Further, in the block 14, a groove 27 is formed in the inclined surface 23. The groove 27 has a depth in the thickness direction of the block 14. Further, in the width direction of the block 14, a groove 27 is formed between a line segment (not shown) extending upward from a position corresponding to the approximate center of the curved surface 25 and a contact surface 26 closer to the line segment. Has been placed.

  A large number of blocks 14 configured as described above are stacked in the circumferential direction of the carrier 13, and the dimples 20 enter the holes 21 between the adjacent blocks 14 to form the belt 12. When the belt 12 is wound around the primary pulley 2 and the secondary pulley 3, the contact surface 26 of the block 14 contacts the contact surfaces 5A and 6A of the primary pulley 2, and the contact surfaces 9A and 10A of the secondary pulley 3. To touch.

  As described above, when the belt 12 is wound around the pulleys 2 and 3, the torque of the driving force source is transmitted to the rotating shaft 4 and the width of the belt mounting groove 7 of the primary pulley 2 is controlled. The ratio of the winding radius of the belt 12 to the primary pulley 2 and the winding radius of the belt 12 to the secondary pulley 3 changes, and the ratio between the rotation speed of the primary pulley 2 and the rotation speed of the secondary pulley 3, that is, the gear ratio. Is controlled. Further, by controlling the width of the belt attachment groove 11 of the secondary pulley 3, the clamping pressure between the primary pulley 2 and the secondary pulley 3 with respect to the belt 12 is adjusted, and the transmission torque of the belt 12 is controlled.

  Depending on the clamping pressure applied to the belt 12, more specifically, the clamping pressure applied to each block 14, between the contact surfaces 5A, 6A, 9A, 10A of each pulley and the contact surface 26 of the block 14. The resulting frictional force changes. And according to the motive power transmitted to each block 14 from the primary pulley 2, the load which compresses each block 14 in the circumferential direction of the belt 12 generate | occur | produces, and the compression load passes through each block 14 and is secondary The secondary pulley 3 is rotated by being transmitted to the pulley 3. In this way, the torque of the primary pulley 2 is transmitted to the secondary pulley 3 via the belt 12, and the torque of the secondary pulley 3 is transmitted to the wheels to generate a driving force.

  By the way, at the time of power transmission by the belt 12, in a region where the belt 12 is not wound around each pulley, the first contact surface 18 and the second contact surface 21 are in contact (adhesion) between adjacent blocks 14. In this state, each block 14 moves (translates) substantially linearly in the stacking direction. In this case, center lines (not shown) in the thickness direction of the block 14 are parallel to each other. On the other hand, in a region where the belt 12 is wound around the pulley, each block 14 moves along a substantially arc-shaped locus. In this case, the second contact surface 19 of the block 14 located in front of the moving direction is in contact with the rocking edge 24 of the block 14 located rearward in the moving direction. In this case, the center lines in the thickness direction of the block 14 intersect each other. Here, during the operation in which the blocks 14 are relatively rotated with the locking edge 24 as a fulcrum, or when the blocks 14 are stopped at a position where the blocks 14 are relatively rotated, the blocks are blocked at locations other than the locking edge 24 and the second contact surface 19. In order to prevent 14 from contacting, the inclined surface 23 is provided. In addition, since the dimples 20 of the adjacent blocks 14 are located in the holes 21, it is possible to always restrict relative movement of the blocks 14 in a direction parallel to the first contact surface 18 and the second contact surface 19.

  Next, a method for manufacturing the block 14 used in the belt 12 as described above will be described with reference to FIGS. 1 (A), 1 (B) and FIG. When manufacturing this block 14, the metal plate-shaped material (raw material) 50 shown in FIG. 5 is used. The plate-like material 50 is long (band-like), and the plate-like material 50 is divided into a thin portion 51 and a thick portion 52 in the width direction with a step portion 50A as a boundary. This plate-like material 50 is manufactured in the first molding step. In FIG. 5, the predicted cutting line in the plate-like material 50 is indicated by a two-dot chain line, and the block 14 is formed by punching the region 14 </ b> A surrounded by the two-dot chain line by a second molding step described later. Is manufactured.

  The configuration of a processing apparatus (press machine or mold or molding machine) 53 for manufacturing the block 14 by pressing the plate-like material 50 will be described with reference to FIG. The processing device 53 includes a plate presser (first molding die) 54 and a die (second molding die) 55. In FIG. 1, a plate presser 54 and a die 55 are configured to be relatively movable in the vertical direction. Further, the plate presser 54 is formed with a first presser surface 56 and a second presser surface 57. Both the first pressing surface 56 and the second pressing surface 57 are configured to be flat, and the first pressing surface 56 is positioned above the second pressing surface 57 in the vertical direction of FIG. ing. On the other hand, a die 55 is provided below the plate presser 54, and a flat support surface 58 is formed on the die 55. A space B1 is formed in the plate retainer 54, and an ejector (punch (third molding die)) 59 is disposed in the space B1. The ejector 59 is movable in the vertical direction in FIG. The planar shape of the ejector 59 is the same as the planar shape of the block 14.

  A molding surface 60 is formed on the lower surface side of the ejector 59 in FIG. The molding surface 60 includes a first molding surface 61 having a planar shape corresponding to the first contact surface 18 of the block 14, a recess 62 disposed in the region of the first molding surface 61, and the block 14. And an inclined surface 63 corresponding to the inclined surface 23, and a second molding surface 70 located below the first molding surface 61. Further, a pressure punch 64 that is movable relative to the ejector 59 in the vertical direction is provided in a region corresponding to the inclined surface 63 of the ejector 59. The pressure punch 64 is disposed at a position corresponding to the inclined surface 26 of the block 14 in the width direction of the inclined surface 63. The planar cross-sectional shape of the pressure punch 64 is the same as the front shape of the groove 27.

  On the other hand, a space C1 is formed in the die 55, and a reverse presser (fourth mold) 65 that can move in the vertical direction is provided in the space C1. The planar shape of the reverse presser 65 is the same as the planar shape of the block 14. In addition, a molding surface 66 is formed on the upper surface of the reverse presser 65, and the molding surface 66 has a flat surface 67 and a protruding portion 68 that protrudes upward from the flat surface 67. The protrusion 68 is disposed at a position corresponding to the recess 62.

  Next, a process of punching out the block 14 from the plate-like material 50 (second molding process) will be described. First, the plate-like material 50 is disposed between the plate retainer 54 and the die 55, one surface of the plate-like material 50 is brought into contact with the support surface 58 of the die 55, and the first retainer surface 56 of the plate retainer 54 is contacted. The thick portion 52 is sandwiched between the die 55 and the thin portion 51 is sandwiched between the second pressing surface 57 and the die 55. Next, the pressure punch 64 is lowered to bite into the surface of the thick portion 52 of the plate-like material 52, and a recess 27A is formed in the plate-like material 52 as shown in FIG. Next, the pressure punch 64 is raised.

  Thereafter, as shown in FIG. 1B, an upward load is applied to the reverse presser 65 and a downward load is applied to the ejector 59. Here, the load applied to the ejector 59 is higher than the load applied to the reverse presser 65. Then, the plate material amount 50 and the portion corresponding to the protruding portion 68 bulges toward the concave portion 62 of the ejector 59, and the dimple 20 and the hole 21 are formed, and the inclined surface 63 of the ejector 59 is opposite to the inclined surface 63. The thick portion 52 of the plate-like material 50 is sandwiched between the flat surface 67 of the presser 65 and the inclined surface 23 and the locking edge 24 are formed on the plate-like material 50. In parallel with such a forming process, the ejector 59 and the reverse presser 65 are lowered with respect to the plate presser 54 and the die 55, whereby a shear load is applied to the predicted cutting line in the plate-like material 50, and the plate The block 14 is punched from the shaped material 50. A plurality of blocks 14 can be manufactured in the longitudinal direction of the plate-like material 50 by performing the process of lowering and raising the ejector 59 once.

  In this way, in the process of pressing the plate-like material 50 and punching out the block 14, that is, in the process of performing the blanking process, first, after forming the concave portion 27A in the thickness direction on the plate-like material 50, The step of pressing the plate-like material 50 to form the inclined surface 23 and the locking edge 24 and the step of punching out the block 14 are performed in parallel, that is, almost simultaneously. Therefore, since the material that flows under the pressure applied when forming the inclined surface 23 flows so as to reduce the volume of the recess 27A, the material does not flow so as to protrude the contact surface 26 of the block 14 to be punched. Is done. In this way, it is possible to suppress the deformation of the contact surface 26 of the block 14 as a product, that is, the shape of the contact surface 26 is different from the intended shape. Therefore, a decrease in flatness of the contact surface 26 can be suppressed.

  In this way, when the belt 12 is configured by laminating the blocks 14 having the contact surfaces 27 with high processing accuracy, the entire contact surfaces 27 of the blocks 14 are in contact with the contact surfaces 5A, 6A, 9A, and 10A of the pulleys. Therefore, the contact surface pressure in the entire contact surface 26, particularly the contact surface pressure in the vertical direction in FIG. 3, can be made uniform. Therefore, wear and separation of the contact surface 27 can be suppressed, and changes in the posture of the block 14 due to disturbance can be suppressed. Further, since the recess 27A remains as the groove 27 in the block 14 after punching, when the lubricant is supplied to the periphery of the belt type continuously variable transmission 1, the lubricant can be held in the groove 27. Decrease in lubricity can be suppressed.

  Instead of the groove 27, a recess (not shown) having a substantially circular front shape may be formed. In this case, a substantially circular recess (not shown) is formed in the plate-like material, and then the plate-like material having the recess is pressed in the thickness direction to form an inclined surface, and the block is plate-like. It will be punched from the material. As described above, the same effect as described above can be obtained when the substantially circular recess is formed and the pressing process is performed to leave the substantially circular depression in the block.

  Next, another configuration example of the block used for the belt 12 of FIG. 2 will be described with reference to FIGS. 6 and 7. FIG. 6 is a front view of the block 100, and FIG. 7 is a side view of the block 100. The block 100 is made of a metal material, and the block 100 has a head portion 101, a neck portion 102, and a trunk portion 103. A head 101 and a trunk 103 are connected from a neck 102. Neck portions 102 are respectively provided at both ends of the block 100 in the width direction, and head portions 103 are individually connected to the neck portions 102. A carrier accommodating portion 104 is provided between the neck portions 102. An endless carrier 105 is disposed in the carrier accommodating portion 104. A number of blocks 100 are stacked and attached in the circumferential direction of the carrier 105.

  Further, a first contact surface 106 and a second contact surface 107 constituting the front and back in the width direction of the block 100 are formed, and the first contact surface 106 is formed across the head portion 101 and the neck portion 102. ing. The second contact surface 107 is formed across the head 101, the neck 102, and the trunk 103. A dimple (projection) 108 that protrudes in the thickness direction of the block 100 is formed in a portion corresponding to the first contact surface 106 in the neck portion 102. Further, a hole (concave portion) 109 having a depth in the thickness direction of the block 100 is formed in the second contact surface 107. Furthermore, an inclined surface 110 is connected to the trunk portion 103 and below the first contact surface 106. A substantially linear rocking edge 111 extending in the width direction of the block 100 is formed at a boundary portion between the first contact surface 106 and the inclined surface 110.

  In addition, the direction of the inclined surface 110 is set in a direction in which the thickness decreases as it is below the block 100. Further, a curved surface 112 that is curved to protrude upward is provided at the lower end of the block 100. The curved portions 112 are provided at two locations in the width direction of the block 100. Further, the inclined surface 110 is formed with a groove 113 whose front shape is substantially rectangular. In the width direction of the block 100, a groove 113 is disposed between a line segment (not shown) extending upward from the approximate center of the curved portion 112 and the contact surfaces 114 formed at both ends of the block 100 in the width direction. Has been. When the blocks 100 configured in this way are stacked in the circumferential direction of the carrier 105, the first contact surface 106 and the second contact surface 107 are in contact with each other between the adjacent blocks 100. Further, when the belt 12 having the block 100 is wound around the primary pulley 2 and the secondary pulley 3, the belt 12 contacts the contact surfaces 5A and 6A and the contact surfaces 9A and 10A of each pulley.

  A frictional force is generated between the contact surfaces 5A, 6A, 9A, and 10A of each pulley and the contact surface 114 of the block 100. Further, a load for compressing the blocks 100 in the circumferential direction of the belt 12 is generated in accordance with the power transmitted from the primary pulley 2 to the blocks 100, and the compression load is transmitted to the secondary via the blocks 100. The secondary pulley 3 is rotated by being transmitted to the pulley 3.

  By the way, in the region where the belt 12 is wound around the pulley, each block 100 moves along a substantially arc-shaped locus. Here, the locking edge 111 and the second contact surface are operated during the operation in which the blocks 100 are relatively rotated with the locking edge 111 as a fulcrum according to the same principle as described above, or when the blocks 100 are stopped at the positions in which the blocks 100 are relatively rotated. In order to prevent the blocks 100 from coming into contact with each other at a place other than 107, an inclined surface 110 is provided. In addition, since the dimple 108 of the adjacent block 100 is located in the hole 109, relative movement of the block 100 in the direction parallel to the first contact surface 106 and the second contact surface 107 can be always restricted.

  The block 100 shown in FIG. 6 and FIG. 7 is also manufactured by punching a plate-like material by press working as described above. In this manufacturing process, the plate material is pressed with a pressure punch to form a recess corresponding to the groove 113, and then the plate material is pressed in the thickness direction to form the inclined surface 110 and the rocking edge 11. By performing the step of punching the block 100 from the plate-like material in parallel at substantially the same time, the material that flows in the forming process of the inclined surface 110 and the locking edge 111 flows so as to reduce the volume of the recess. As a result, the flatness of the contact surface 114 formed on the block 100 can be maintained, and the same effect as described above can be obtained. Further, since the groove 113 remains in the manufactured block 100, the lubricating oil can be held in the groove 113 in the product state of the belt 12, and the same effect as described above can be obtained.

  In the case where the block 14 shown in FIGS. 3 and 4 is manufactured, and in the case where the block 100 shown in FIGS. 6 and 7 is manufactured, the positions of the recesses to be processed before the inclined surfaces 23 and 110 are formed. Will be described. In the front view of the block 100, it is desirable that a recess is formed so that a part of the groove 113 and a part of the inclined surface 110 interfere with each other. In particular, in the width direction of the block, it is desirable that a recess be formed between the contact surface 26 and 114 and a line segment extending upward from the approximate center of the curved surfaces 25 and 112. The reason for this is that when the material flows with the applied pressure when the inclined surfaces 23 and 110 are formed, considering the shape of the curved surfaces 25 and 112, moving toward the center in the width direction of the block increases the flow resistance. For this reason, it is difficult to flow and the flow resistance is considered to flow toward the inclined surfaces 23 and 110 which are considered to be low. As described above, since the recess is formed in the path through which the material flows, the deformation of the inclined surfaces 23 and 110 can be effectively suppressed by causing the flowing material to escape into the recess. In addition, the shape and number of the concave portions formed in the block press forming step are not particularly limited. In addition, the 1st shaping | molding die thru | or 4th shaping | molding die which comprise a processing apparatus are the structure which presses a block by moving relatively up and down (vertical direction), or by moving relatively in the horizontal direction, Any configuration in which the block is pressed may be used.

  Here, the correspondence between the configuration described in the embodiment and the configuration of the present invention will be described. The primary pulley 2 and the secondary pulley 3 correspond to the “plurality of pulleys” of the present invention. , Corresponding to the “contact surface” of the present invention, forming the inclined surface 23 or the inclined surface 110 on the plate-like material 50, forming the locking edge 24 or the locking edge 111, forming the contact surface 26 or the contact surface 114 The process to perform corresponds to the “molding process” of the present invention. That is, in the present invention, the concept of the molding process is that the plate-shaped material is pressed to make the surface shape of the block the desired shape, and the plate-shaped material is sheared to obtain the outer peripheral shape (contour) of the block. To have the desired shape. That is, the molding process includes surface molding, corner molding, depression (concave) molding, and the like. The region 14A corresponds to the “region to be punched” of the present invention, and the rectangular concave portion 27A and the substantially circular concave portion (not shown) correspond to the “concave portion” of the present invention. 113 and a substantially circular depression (not shown) correspond to the “recessed portion remaining in the block after punching” of the present invention.

  Here, the characteristic configuration of the present invention disclosed in this embodiment will be described as follows. That is, in forming a block having a contact surface that is circumferentially stacked to form an endless belt wound around a plurality of pulleys and that comes into contact with the pulleys, the plate-like material is formed in the thickness direction. In the forming method of the belt block for forming the block by forming a rocking edge serving as a fulcrum when the stacked blocks are pressed against each other and forming the block by punching the plate-like material, the plate-like material A recess having a depth in the thickness direction of the plate-like material is formed in a region where the block is to be punched, and then the plate-like material in which the recess is formed is formed in the thickness direction. A method for forming a block for a belt, wherein the rocking edge is formed by applying pressure. In this embodiment, when the plate-like material 50 having the stepped portion 50A is manufactured in the first step, the concave portion 27 may be formed at the same time as the stepped portion 50A is formed. That is, any structure may be used as long as the concave portion 27 is formed, the inclined surfaces 23 and 110 are formed, the rocking edges 24 and 111 are formed, and the blocks 14 and 100 are punched out.

(A), (B) is sectional drawing which shows the formation process of the block in this invention. It is a conceptual diagram of the continuously variable transmission around which the belt which has a block in this invention was wound. It is a front view of the block in this invention. FIG. 4 is a side view of the block shown in FIG. 3. It is a top view of the plate-shaped material used at the formation process of the block shown in FIG. It is a front view which shows the other Example of the block in this invention. FIG. 7 is a side view of the block shown in FIG. 6.

Explanation of symbols

  2 ... primary pulley, 3 ... secondary pulley, 12 ... belt, 14,100 ... block, 14A ... area, 26, 114 ... contact surface, 27, 113 ... groove, 27A ... recess, 50 ... plate-like material.

Claims (4)

A belt block comprising a belt wound around a plurality of pulleys and having a contact surface in contact with the pulleys,
A belt block having a contact surface formed by pressing a plate material to form a recess and then pressing the plate material.   The belt block according to claim 1, wherein the concave portion remains after the contact surface is formed. When forming a belt that is wound around a plurality of pulleys and that has a contact surface that contacts the pulleys, a plate material is pressed in the thickness direction to perform a forming process, and the plate In a method for forming a block for a belt, in which the block is formed by punching a material,
A concave portion having a depth in the thickness direction of the plate-shaped material is formed in a region of the plate-shaped material that is planned to be punched as the block, and then the plate-shaped material on which the concave portion is formed is formed. A method for forming a block for a belt, wherein the forming process is performed by pressing in the thickness direction.   The method for forming a block for a belt according to claim 1, wherein the concave portion is left in the punched block.

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