JP5212064B2 - Transmission belt element forming method and forming apparatus - Google Patents

Description

  The present invention relates to a method for forming an element that constitutes a transmission belt by being bundled by a ring in a state in which the posture is aligned in the plate thickness direction, and an apparatus for forming the element.

  A belt-type continuously variable transmission using a winding transmission mechanism uses two sets of pulleys, a driving pulley and a driven pulley, and a transmission belt wound around these pulleys to change the transmission ratio steplessly. It is a transmission to be made. As a power transmission belt used in such a belt-type continuously variable transmission, for example, a large number of plate pieces called elements or blocks are arranged in an annular shape by overlapping each other in the plate thickness direction. A belt formed into an endless ring shape is known by binding the ring in a ring shape with a ring or band or carrier called a carrier.

  When the drive pulley is driven in a state in which such a transmission belt is wound around two sets of pulleys on the drive side and the driven side, the friction force of the contact portion between the element and the drive side pulley is applied to the element, In addition, a compressive force is applied in the element stacking direction, that is, in the thickness direction of the element, applied to the element from the driving pulley according to the torque of the driving pulley. Then, the compressive force transmitted to the element in contact with the driving pulley is transmitted to the element in contact with the driven pulley via the element not wound around the pulley. When a compressive force is transmitted to the element in contact with the driven pulley, the driven pulley is rotated in accordance with the frictional force of the contact portion between the element and the driven pulley and the transmitted compressive force. Torque is generated. In this way, power is transmitted between the driving pulley and the driven pulley via the transmission belt.

  An example of a method for forming an element constituting the transmission belt as described above is described in Patent Document 1. The method for forming a belt element described in Patent Document 1 is a method in which a large number of layers are stacked in the thickness direction to form an endless belt wound around a pulley, and power is transmitted between the pulleys. A body part to which a compressive force is applied in the thickness direction, a head part provided on the outer peripheral side of the belt with respect to the body part, a neck part for connecting the head part and the body part, and a head part An element having an engagement recess recessed in the thickness direction and an engagement protrusion protruding in the thickness direction is formed by pressing a metal plate material, An engagement recess and an engagement projection are formed by compression processing, and an area including the engagement recess and the engagement projection in the plate-like material is punched to form an element outline. .

JP 2006-192459 A

  According to the element forming method as described in the above-mentioned Patent Document 1, as shown in FIG. 8, the element has a metal plate-like material a placed on a die b, The material a is fixed by a plate presser c that opposes the die b in the pressing direction or the punching direction (vertical direction in FIG. 8), and in this state, the material a is loaded onto the punch d, the ejector e, and the plate presser c to compress the material a. And by punching, the shapes of the surfaces such as the engagement concave portions and the engagement convex portions are formed, and the outline of the outer shape of the element E is formed.

  In such conventional pressing, the direction of the press surface (the left-right direction in FIG. 8) of the die b, the plate presser c, the punch d, and the ejector e is perpendicular to the press direction of the punch d and the ejector e. ing. That is, the material a of the element E is arranged and pressed so that the direction of the plate surface (left and right direction in FIG. 8) is orthogonal to the pressing direction. Therefore, the outer shape forming the contour of the element E after the press working is, as shown in FIG. 9A, a draft (a portion indicated by θ1 in FIG. 9A) in the thickness direction. A gradient is formed due to a person (part indicated by θ2 in FIG. 9A) generated during shearing by punching. FIG. 10 shows, for reference, contour shape measurement data in the thickness direction of the saddle surface f of the element E formed by conventional pressing. It can be seen that in the plate thickness direction of the saddle surface f, a gradient is formed by a drafting portion of press working and a sloping portion further inclined than the drafting portion.

  When the gradient as described above is formed in the thickness direction of the so-called saddle surface f of the element E as shown in FIG. 9A, in other words, the saddle surface f of the element E is changed to that shown in FIG. Is formed as an inclined surface having a slope as shown in FIG. 9, the saddle surface f of the element E is inclined in the thickness direction in a state where the element E and the ring R are assembled as shown in FIG. The edge portion g formed by this is in contact with the inner peripheral surface h of the ring R, that is, edge contact occurs between the saddle surface f of the element E and the inner peripheral surface h of the ring R, and the inner periphery of the ring R Bending stress and contact stress generated on the surface h are increased. As a result, the durability of the ring R, that is, the transmission belt may be reduced.

  The present invention has been made paying attention to the technical problem described above, and is capable of forming a transmission belt element capable of improving durability by preventing edge contact between the saddle surface of the element and the inner peripheral surface of the ring. It is an object of the present invention to provide a method and a molding apparatus.

  In order to achieve the above object, the invention according to claim 1 is directed to a transmission belt in which a plurality of plate-like individuals are arranged in an annular shape so as to face each other with their postures aligned, and are bound by a ring. The element having a saddle surface that comes into contact with the inner peripheral surface of the ring when being bound by the ring is compressed by stamping and punching a plate-shaped material. In the method for forming a power transmission belt element to be molded, the material is arranged in a state where the plate surface of the material is inclined with respect to a plane perpendicular to the pressing direction during the pressing, and the pressing is performed in that state. Then, the element is formed, and a method for forming a transmission belt element is provided.

  Further, the invention of claim 2 is the invention of claim 1, wherein the plate surface of one plate surface with respect to the flat surface including the inner peripheral side end portion when formed on the element of any one of the plate surfaces. The transmission belt element forming method is characterized in that the inclination is set in a direction in which an outer peripheral side end portion when formed into the element is moved away from a surface side where dripping occurs during the press working.

  On the other hand, the invention according to claim 3 forms an element constituting the transmission belt by arranging a plurality of plate-like individuals in an annular shape facing each other in a state of uniform posture, and binding them with a ring. A transmission belt for forming the element having a saddle surface that comes into contact with an inner peripheral surface of the ring when being bound by the ring by a pressing process for compressing and punching a plate-shaped material. In the element forming apparatus, the pressing process is performed on the pressing surface and the pressing surface of a molding die that places the material during the pressing process and contacts the plate surface of the material to perform the compression process or the punching process. The transmission belt element is provided with an inclined surface inclined with respect to a plane perpendicular to the pressing direction at the time of It is in the form equipment.

  According to a fourth aspect of the present invention, there is provided the invention according to the third aspect, wherein one plate surface of the plate surface is formed with respect to the flat surface including the inner peripheral end when the plate surface is molded into the element. An apparatus for forming an element for a transmission belt, characterized in that the inclination is set in a direction in which an outer peripheral side end portion when formed into the element moves away from a surface side where dripping occurs during the press working.

  According to the first aspect of the present invention, the pressing is performed with the plate surface of the material inclined with respect to the plane orthogonal to the pressing direction. As a result, the inclination angle of the saddle surface of the element formed by stamping during pressing is compared with the conventional molding method in which the material is arranged so that the plate surface of the material is orthogonal to the pressing direction. Can be changed. That is, the slope formed on the saddle surface during pressing is adjusted by pressing the element in a state where the material is arranged with an appropriate inclination with respect to the plane perpendicular to the pressing direction, and the element is adjusted. A saddle surface having a shape capable of avoiding or suppressing edge contact with the inner peripheral surface of the ring is formed. Therefore, it is possible to form a transmission belt element that prevents stress concentration due to edge contact and excessive stress generation and improves the durability of the transmission belt.

  Further, according to the invention of claim 2, the plate surface of the material in a direction in which the outer peripheral side end portion of the element after forming is inclined from the side where burr is generated at the time of forming to the side where drooling occurs with respect to the plane orthogonal to the pressing direction. The press working is performed in a state where the angle is inclined. As a result, the inclined surface formed by the draft angle and the sag on the saddle surface of the element after pressing is convex in the center of the saddle surface in the plate thickness direction, so that when the element and the ring are assembled, the ring Occurrence of edge per edge with respect to the inner peripheral surface is avoided or suppressed. Therefore, it is possible to form a transmission belt element that prevents stress concentration due to edge contact and excessive stress generation and improves the durability of the transmission belt.

  On the other hand, according to invention of Claim 3, a raw material is arrange | positioned in the shaping | molding die of press work in the state which the plate | board surface of the raw material inclined with respect to the plane orthogonal to a press direction. And it is loaded on a raw material via the press surface and pressing surface of the shaping | molding die provided with the inclined surface corresponding to the inclination, and press work is implemented. As a result, the inclination angle of the saddle surface of the element formed by stamping during pressing is compared with the conventional molding method in which the material is arranged so that the plate surface of the material is orthogonal to the pressing direction. Can be changed. That is, the slope formed on the saddle surface during pressing is adjusted by pressing the element in a state where the material is arranged with an appropriate inclination with respect to the plane perpendicular to the pressing direction, and the element is adjusted. A saddle surface having a shape capable of avoiding or suppressing edge contact with the inner peripheral surface of the ring is formed. Therefore, it is possible to form a transmission belt element that prevents stress concentration due to edge contact and excessive stress generation and improves the durability of the transmission belt.

  According to the invention of claim 4, the plate surface of the material in a direction in which the outer peripheral side end portion of the element after molding is inclined from the side where burr occurs at the time of molding to the side where drooling occurs with respect to the plane orthogonal to the pressing direction. The material is placed on the mold in a state where the is inclined. And it is loaded on a raw material via the press surface and pressing surface of the shaping | molding die provided with the inclined surface corresponding to the inclination, and press work is implemented. As a result, the inclined surface formed by the draft angle and the sag on the saddle surface of the element after pressing is convex in the center of the saddle surface in the plate thickness direction, so that when the element and the ring are assembled, the ring Occurrence of edge per edge with respect to the inner peripheral surface is avoided or suppressed. Therefore, it is possible to form a transmission belt element that prevents stress concentration due to edge contact and excessive stress generation and improves the durability of the transmission belt.

  Next, the present invention will be specifically described with reference to the drawings. First, the configuration of the transmission belt element that is the subject of the present invention will be described. 1 and 2 show a configuration example of a transmission belt and a transmission belt element constituting the transmission belt according to the present invention. The transmission belt B shown here is a belt that is wound around, for example, a driving side (input shaft) pulley and a driven side (output shaft) pulley of a belt type continuously variable transmission, and transmits power between these pulleys. It is an example. In FIG. 1, an element 1 is made of, for example, a metal plate-like member, and left and right end faces 2, 3 in the width direction (x-axis direction in FIG. 1) are formed as tapered inclined surfaces. It has a plate portion (main body portion) 4 which is a base portion. The tapered left and right end surfaces 2 and 3 are brought into frictional contact with a belt winding groove (V-shaped groove) 5a of a pulley 5 which is a driving pulley or a driven pulley of a belt type continuously variable transmission, thereby generating torque. It has become a friction surface to transmit.

  A neck portion 6 extending upward in FIG. 1, that is, on the outer peripheral side as the transmission belt B, is formed in the central portion in the width direction (x-axis direction in FIG. 1) of the plate portion 4. A top portion 7 extending in an umbrella shape is formed integrally with the neck portion 6 at the upper end portion of the neck portion 6 on both sides in the width direction of the plate portion 4. Accordingly, a slit portion (groove portion) opened in the left-right direction in FIG. 1 between the upper edge portion of the plate portion 4 in FIGS. 1 and 2 and the lower edge portion of the top portion 7 in FIGS. ) 8 is formed. The slit portion 8 is a portion for inserting and winding a ring 9 which is, for example, a metal ring-shaped band for binding the elements 1 arranged in an annular shape in close contact with each other in an annular shape. The upper edge portion of the plate portion 4 in FIGS. 1 and 2 places the inner surface 9a of the ring 9 in contact with the element 1 when the ring 9 is wound around the element 1, in other words, a plurality of annularly arranged elements. When the element 1 is bound by the ring 9, the saddle surface 10 comes into contact with the inner peripheral surface 9 a of the ring 9.

  In addition, each element 1 is formed with a convex portion and a concave portion that are fitted to each other in order to determine a relative position. In other words, the above-described extended position of the neck 6 (or the central portion of the top 7) is convex to one side 1a (the left side in FIG. 2) in the plate thickness direction (z-axis direction in FIG. 2) of the element 1. A dimple 11 having a circular cross section is formed. A bottomed cylindrical hole 12 that is concave on the other side surface 1b (the right side surface in FIG. 2) opposite to the dimple 11 and that loosely fits (inserts) the dimple 11 in the adjacent element 1. Is formed. Therefore, when these dimples 11 and the holes 12 are fitted, the relative positions of the adjacent elements 1 in the left-right direction and the vertical direction in FIG. 1 when they are arranged in an annular shape are determined.

  In the element 1 having such a configuration, the vertical position in FIGS. 1 and 2 is restricted by the dimple 11 and the hole 12, and on the other hand, the tension of the ring 9 causes the saddle surface 10 to be placed on the saddle surface 10 in FIGS. A downward load, that is, a load in the inner peripheral direction as the transmission belt B acts. For this reason, for example, a load in the direction of pulling or compressing the neck 6 may act due to the influence of dimensional variation between the dimple 11 or the hole 12 and the saddle surface 10. In this case, since the saddle surface 10 extends from the base end portion of the neck portion 6 in a right angle direction (x-axis direction in FIG. 1), a bending moment acts between the neck portion 6 and the saddle surface 10. Since the bending moment becomes maximum at the corner portion which is the boundary portion between the neck portion 6 and the saddle surface 10, in order to prevent stress concentration at this portion, the corner portion is so-called a circular arc. A corner R portion 13 is formed.

  The elements 1 are bound by a ring 9 in an annular arrangement, and are wound around the pulleys 5 on the driving side and the driven side in this state. Therefore, in the state of being wound around the pulley 5, each element 1 expands in a fan shape with respect to the center of the pulley 5, in other words, the elements 1 are arranged in an arc shape and need to be in close contact with each other. Therefore, the lower portion of each element 1 in FIGS. 1 and 2 (the portion on the center side in an annular arrangement) is formed thin. That is, the height direction of the element 1 (FIG. 1) is such that one side surface 1a in the plate thickness direction (z-axis direction in FIG. 2) of the plate portion 4 is in the radial direction when the elements 1 are arranged in an arcuate shape. , The portion below the saddle surface 10 in a predetermined dimension (offset) in the y-axis direction) is formed so as to be thinner than the plate thickness of the plate portion 4.

  Therefore, when each element 1 spreads and contacts in fan shape, it contacts in the boundary part from which the board thickness changes. That is, the edge of the boundary portion is a rocking edge 14 that comes into contact with another adjacent element 1 when the elements 1 are arranged in an arc shape.

  And the transmission belt B is comprised by assembling many elements 1 comprised as mentioned above and the two rings 9. As shown in FIG. That is, as shown in FIG. 3, the transmission belt B has a predetermined number of a large number of elements 1 arranged in an annular shape with their respective directions and orientations aligned, and two rings 9 are formed in the slit portions 8 of the elements 1. Is inserted and wound, and the element 1 is formed into a ring shape by a ring 9 and is bound.

  Here, the element 1 as described above is formed by press working, usually using a plate-like material, mainly a metal plate material, by compression and punching by a press. That is, the shape of the dimple 11 and the hole 12 on both side surfaces 1a and 1b of the element 1 is formed by compressing a metal plate-shaped material, and the contour shape of the element 1 is formed by punching. The In particular, since the contour shape of the element 1 is required to have high accuracy in order to prevent the occurrence of uneven load and stress concentration, the element 1 is formed by precision pressing called precision punching or fine blanking. .

  When the element 1 is formed by press working as described above, generally, as shown in FIG. 8 described above, the element 1 with respect to the press direction at the time of press working, that is, the loading direction at the time of press work. The material is arranged and pressed so that the direction of the plate surface of the material for forming the sheet is orthogonal to the direction of the plate surface (the plane facing the front and back in the plate thickness direction of the plate material). Therefore, as described above, the draft of the outer surface of the element 1 after forming by press working, that is, the contour surface in the thickness direction forming the contour of the element 1, has a draft and inevitably generated during press working. A gradient is formed. That is, on the contour surface of the element 1, an inclination with respect to the plate thickness direction of the element 1, which is composed of draft angle and wholly, is inevitably formed as in the example shown in FIG.

  When such an inclination is formed particularly on the saddle surface 10 of the element 1, an angle formed by the saddle surface 10 and one side surface 1 a of the element 1 becomes an edge portion that protrudes acutely outside the element 1. . Then, when the element 1 and the ring 9 are assembled, that is, when a large number of elements 1 arranged in an annular shape are bound by the ring 9, the saddle surface 10 of the element 1 and the inner peripheral surface 9 a of the ring 9. The abutting portion is in contact with the edge as in the example shown in FIG. 9B, and as a result, the stress generated on the inner peripheral surface 9a of the ring 9 is increased.

  Therefore, in the method and apparatus for forming an element for a transmission belt according to the present invention, a plate-like material provided when the element 1 is formed by press working is used with respect to a plane whose plate surface is perpendicular to the press direction. In this state, by pressing in that state, the saddle surface 10 of the element 1 is prevented from forming the edge portion having the acute angle as described above, and the saddle surface 10 is moved to the plate. It can be formed in a shape that protrudes to the outside at the center in the thickness direction.

  Specifically, first, a transmission belt element forming apparatus according to the present invention will be described. FIG. 4 shows the configuration of a press molding apparatus M for molding the element 1 that is the subject of the present invention described above by press working. As described above, the element 1 that is the object of the present invention needs to form its contour shape with high accuracy, particularly in terms of function. For this reason, the press molding apparatus M can, for example, accurately contour the element 1 with high accuracy. It is preferable that the so-called precision blanking (fine blanking) for punching is possible.

  In FIG. 4, the press molding apparatus M includes a punch 21 and a plate presser 22 which are upper molds in the example shown in FIG. 4 as upper and lower molds which are paired with each other during press processing, and the example shown in FIG. Then, it comprises a die 23 and an ejector 24 serving as a lower mold.

  The punch 21 and the ejector 24 are arranged at positions facing each other in the vertical direction (up and down direction in FIG. 4). In this example, the punch 21 and the ejector 24 are configured to be movable up and down in the vertical direction. Among these, the punch 21 is configured to be loaded with a press load in the vertical downward direction, and the ejector 24 is configured to be loaded with the press load upward in the vertical direction.

  Pressing surfaces 21a and 24a, which are the loading surfaces on which the pressing load is loaded, are formed at the tip portions of the punch 21 and the ejector 24 that are opposed to each other, respectively, during pressing. Has been. That is, in the example shown in FIG. 4, the press surface 21 a of the punch 21 is in contact with the plate surface 25 b of the material 25, and a mold for mainly forming the shape of the hole 12 of the element 1 is formed. The press surface 24a of the ejector 24 is in contact with the plate surface 25a of the material 25 (the surface on the opposite side in the plate thickness direction of the plate surface 25b), and mainly shapes such as the dimple 11 and the locking edge 14 of the element 1 are formed. A mold is formed.

  Further, the press surface 21 a of the punch 21 has a contour shape in the direction of the press surface 21 a that is substantially the same as the contour shape of the element 1, and is cut when the material 25 is punched to form the contour shape of the element 1. It is comprised so that it may become a blade. Further, the press surface 24 a of the ejector 24 is also configured such that the contour shape in the direction of the press surface 24 a is substantially the same as the contour shape of the element 1.

  Therefore, by applying a press load to the material 25 by the punch 21 and the ejector 24, the surface shapes of the both side surfaces 1 a and 1 b of the element 1 can be formed on both plate surfaces 25 a and 25 b of the material 25. That is, by applying a press load to the plate surface 25b of the material 25 via the press surface 21a of the punch 21, the shape of the side surface 1b of the element 1 such as the hole 12 can be formed on the plate surface 25b. Further, by applying a press load to the plate surface 25a of the material 25 via the press surface 24a of the ejector 24, the shape of the side surface 1a of the element 1 such as the dimple 11 and the locking edge 14 can be formed on the plate surface 25a. it can.

  On the other hand, the die 23 is arranged on the side facing the punch 21 and surrounding the contour of the ejector 24 in the direction of the press surface 24a. In this example, the die 23 receives a reaction force against a downward load in the vertical direction. For example, it is being fixed to the main body (not shown) etc. of the press molding apparatus M.

  At the tip of the die 23 facing the punch 21, the material 25 is placed at a predetermined position during pressing, and a press load (reaction force) is loaded by contacting the plate surface 25 a of the material 25. A pressing surface 23a is formed as a loading surface and a cutting edge when the material 25 is punched.

  That is, the die 23 is hollowed in the vertical direction, and a hollow portion is formed in which the punch 21 and the ejector 24 are inserted and moved relative to each other in the vertical direction. The inner circumference of the hollowed portion is hollowed out. The contour shape of the surface in the direction of the press surface 23 a is substantially the same as the contour shape of the element 1. More specifically, the shape is enlarged by a predetermined clearance with respect to the contour (ie, cutting edge) shape of the press surface 21a of the punch 21. When the material 25 is punched and the contour shape of the element 1 is formed, the other cutting edge is formed opposite to the one cutting edge formed by the press surface 21a of the punch 21.

  Therefore, by applying a press load to the material 25 by the punch 21, the material 25 can be punched to form the contour shape of the element 1. That is, the material 25 is sheared by the cutting blade formed on the outer shape of the press surface 21 a of the punch 21 and the cutting blade formed on the inner periphery of the hollow portion of the die 23, that is, the material 25 is punched into the element 1 in a contour shape. Thus, the contour shape of the element 1 can be formed.

  Note that the above-described ejector 24 is movable downward in the vertical direction even when it is loaded to form the surface shape of the plate surface 25a of the material 25. Therefore, the punch 21 and the ejector 24 are loaded respectively, and loaded on the punch 21 in a state in which the surface shapes of both side surfaces 1a and 1b of the element 1 are formed on both plate surfaces 25a and 25b of the material 25, that is, in a compressed state. The material 25 can be punched according to the cutting edge of the punch 21 and the cutting edge of the die 23 by the load.

  Further, when the material 25 is punched by the punch 21 and the die 23 to form the contour shape of the element 1 as described above, both the plate surfaces 25a and 25b of the material 25, that is, the both side surfaces 1a and 1b of the element 1 are formed. In each case, drooling or burr caused by punching shearing inevitably occurs. That is, in the example shown in FIG. 4, when the punching process is performed, the cutting edge of the die 23 first bites into the edge portion 1a of the side surface 1a of the element 1 where shearing starts, and the punching process is performed. Then, burr is generated in the contour portion of the other side surface 1b of the element 1 that is finally sheared. Therefore, when the element 1 is molded as in the example shown in FIG. 4, the side surface 1a of the element 1 is the “side on which drooling occurs” and the side surface 1b of the element 1 is the “side on which burr is generated”.

  On the other hand, the plate retainer 22 is disposed on the side facing the die 23 and surrounding the contour of the punch 21 in the direction of the press surface 21a. In the example shown in FIG. In addition, it is configured so that a downward load in the vertical direction is loaded during press working.

  The front end portion of the plate presser 22 facing the die 23 is in contact with the plate surface 25b of the material 25 during press working, that is, when a downward load is applied to the plate presser 22 and A pressing surface 22a serving as a loading surface on which a load for fixing the material 25 and applying a compressive stress to the periphery of the punched portion of the material 25 is formed.

  That is, the plate retainer 22 is hollowed out in the vertical direction, and a hollow portion is formed in which the punch 21 is inserted and relatively moved in the vertical direction, and the inner circumferential surface of the hollowed portion is hollowed out. The contour shape in the direction of the pressing surface 22 a is substantially the same as the contour shape of the element 1. More specifically, the shape is enlarged by a predetermined clearance with respect to the contour shape of the press surface 21 a of the punch 21.

  Each of the press surfaces 21a, 23a, 24a and the pressing surface 22a has an angle α with respect to the press (loading) direction at the time of pressing, that is, the plane orthogonal to the vertical direction in the example shown in FIG. It is formed as inclined surfaces 21a, 23a, 24a, and 22a that are inclined only by that amount. In other words, the punch 21, the plate presser 22, the die 23, and the ejector 24, that is, the press surfaces 21 a, 23 a, 24 a and the presser surfaces 22 a of the respective molds 21, 22, 23, 24 of the press molding apparatus M, respectively In addition, inclined surfaces 21a, 23a, 24a, and 22a that are inclined by an angle α with respect to a plane orthogonal to the pressing direction in press working are provided.

  As shown in FIG. 4, the inclination by the angle α is a plate surface with respect to a plane P orthogonal to the press direction including the inner peripheral side end portion 1 c when the element 25 of the plate surface 25 b of the material 25 is formed. The outer peripheral side end 1d when it is formed into the element 1 of 25a is set in a direction away from the “side where the drooling occurs”, that is, the side surface 1a during the press working.

  Therefore, when the element 1 is formed by the press forming apparatus M configured as described above, the plate surfaces 25a and 25b of the plate-like material 25 are planes perpendicular to the pressing direction at the time of pressing, particularly the plate surface 25b. When the outer peripheral side end 1d formed on the element 1 of the plate surface 25b is pressed against the plane P perpendicular to the pressing direction including the inner peripheral side end 1c when the element 1 is formed. The material 25 is placed in the press molding apparatus M so as to be inclined in the direction away from the side surface 1a of “the side where the drooping occurs”, and in that state, the material 25 is subjected to press working for compressing and punching. Element 1 can be molded.

  Next, a method for forming a transmission belt element according to the present invention, that is, a method for forming the element 1 using the press forming apparatus M configured as described above will be described. First, a metal plate material is supplied as the material 25 for forming the element 1. As shown in FIG. 5, for example, in order to form a stepped portion formed in a strip shape by rolling or the like and below the locking edge 14 on the side surface 1 a side of the element 1, the cross section has a step in advance. The raw material 25 formed as a board | plate material may be sufficient.

  The supplied material 25 is placed on the die 23 of the press molding apparatus M. Specifically, the material 25 is placed at a predetermined position on the press surface 23a of the die 23, that is, the inclined surface 23a so that the plate surface 25a of the material 25 and the press surface 23a come into contact with each other. As described above, since the press surface 23a of the die 23 is formed as the inclined surface 23a inclined by the angle α with respect to the plane orthogonal to the press direction at the time of press processing, the material 25 is formed at the time of press processing. It is placed on the press surface 23a of the die 23 in a state inclined by an angle α with respect to a plane orthogonal to the press direction. That is, the plate surfaces 25a and 25b of the material 25 are arranged on the element 1 of the plate surface 25b with respect to the plane P perpendicular to the press direction including the inner peripheral side end portion 1c when the element 1 of the plate surface 25b is formed. The outer peripheral side end portion 1d at the time of molding is placed on the press surface 23a of the die 23 in a state of being inclined in a direction away from the side surface 1a on the “side where drooping” occurs during press working.

  After the material 25 is placed on the press surface 23a of the die 23, the plate retainer 22 is lowered, that is, the plate retainer 22 is moved downward in the vertical direction, and the retainer surface 22a of the plate retainer 22 and the plate surface of the material 25 25b is brought into contact. Then, a load in the pressing direction, that is, in the vertical direction downward (downward in FIG. 4) is loaded on the plate retainer 22. Accordingly, the material 25 is held between the press surface 23 a of the die 23 and the pressing surface 22 a of the plate retainer 22, and the material 25 is fixed in a state where it is placed on the die 23. At the same time, the portion sandwiched between the pressing surface 23 a and the pressing surface 22 a of the material 25 is compressed by the load loaded on the plate pressing 22. That is, a compressive stress due to the load loaded on the plate presser 22 is generated in the portion sandwiched between the press surface 23 a and the presser surface 22 a of the material 25.

  The material 25 is placed on the press surface 23a while being inclined by an angle α with respect to the plane P orthogonal to the press direction, and the material 25 is placed on the press surface 23a of the die 23 and the press surface 22a of the plate presser 22. In a state in which the punch 21 and the ejector 24 are fixed and generate compressive stress, loads in the pressing direction, that is, the vertical direction (up and down direction in FIG. 4) are respectively loaded. That is, a vertically downward load (downward in FIG. 4) is loaded on the punch 21, and a vertical upward load (upward in FIG. 4) is loaded on the ejector 24.

  The loads loaded on the punch 21 and the ejector 24 in this way are loaded on the material 25 via the press surface 21a of the punch 21 and the press surface 24a of the ejector 24, respectively. Accordingly, the material 25 is compressed, and the surface shapes of the both side surfaces 1 a and 1 b of the element 1 are formed on both plate surfaces 25 a and 25 b of the material 25. That is, a press load is loaded on the plate surface 25b of the material 25 via the press surface 21a of the punch 21, the shape of the side surface 1b of the element 1 is formed on the plate surface 25b, and the ejector 24 is pressed on the plate surface 25a of the material 25. A press load is loaded through the surface 24a, and the shape of the side surface 1a of the element 1 is formed on the plate surface 25a.

  Further, the both side surfaces 1 a and 1 b of the element 1 are formed as described above, and the cutting blade of the press surface 21 a of the punch 21 and the cutting blade of the press surface 23 a of the die 23 are loaded by the load loaded on the punch 21. The material 25 is punched in between, and the contour shape of the element 1 is formed.

  Therefore, the material 25 placed on the die 23 in an inclined state with respect to the plane P orthogonal to the pressing direction is fixed and compressed by the die 23 and the plate holder 22 in the inclined state, In this state, the punch 21 and the ejector 24 are compressed to form both side surfaces 1a and 1b of the element 1 on both plate surfaces 25a and 25b of the material 25, respectively. At the same time, the punch 21, the die 23 and the plate presser 22 are punched into the contour shape of the element 1. That is, the element 1 is formed from the material 25.

  As described above, the plate-shaped material 25 is disposed in a state inclined by an angle α with respect to the plane P orthogonal to the pressing direction, and the element 1 is formed by performing press working in this state. One saddle surface 10 is formed so as to be convex at the central portion of the element 1 in the plate thickness direction.

  That is, as shown in FIG. 6A, with respect to a plane P orthogonal to the pressing direction including the inner peripheral end 1c when the plate-like material 25 is formed on the element 1 of the plate surface 25b. Pressing is performed in a state where the outer peripheral side end portion 1d when formed on the element 1 of the plate surface 25b is inclined by an angle α in the direction away from the “side where the drooping occurs”, that is, the side surface 1a. Accordingly, the drooping portion 10a and draft angle portion 10b inevitably formed on the saddle surface 10 of the element 1 during the press working are respectively in the punching direction of the press working (the left-right direction in FIG. 6A). It becomes a plane or a curved surface inclined by an angle β1 and a smaller angle β2. Therefore, as shown in FIG. 6B, the saddle surface 10 of the element 1 is formed between the drooping portion 10a and the draft portion 10b in the plate thickness direction of the element 1 (the left-right direction in FIG. 6B). The connecting portion is formed in a mountain shape or a curved surface that protrudes to the outer peripheral side (upper side in FIG. 6B) at the central portion in the plate thickness direction.

  As a result, as shown in FIG. 6 (b), when the ring 9 is wound around the element 1, the abutting portion 10a of the saddle surface 10 and the draft portion are in contact with the inner peripheral surface 9a of the ring 9. It becomes an obtuse angled convex part formed by the connecting part with 10b, and an acute edge part does not contact the inner peripheral surface 9a of the ring 9. Therefore, it is possible to avoid the occurrence of stress concentration on the inner peripheral surface 9a due to the contact of the acute edge portion with the inner peripheral surface 9a of the ring 9, and the durability of the transmission belt B can be prevented from being lowered.

  In addition, as described above, the plate-shaped material 25 is disposed in a state inclined by an angle α with respect to the plane P orthogonal to the pressing direction, and the element 1 is formed by performing pressing in that state. The surface 15 on the side facing the saddle surface 10 of the slit portion 8 of the element 1 is formed with a corner portion connecting the surface 15 and the side surface 1b as an acute edge portion. However, there is no problem because the surface 15 does not come into contact with the outer peripheral surface of the ring 9 or other parts under load.

  As described above, according to the transmission belt element forming method and forming apparatus of the present invention, the plate surfaces 25a and 25b of the material 25 are inclined with respect to the plane P orthogonal to the pressing direction. In this case, the outer peripheral side end portion 1d of the element 1 after molding is a plate of the material 25 in a direction in which it tilts from the “side where burr is generated” (that is, the side surface 1b side) to the “side where drooling occurs” (that is, the side surface 1a side) Press work is performed with the surfaces 25a and 25b inclined. As a result, the inclination of the saddle surface 10 of the element 1 formed by stamping at the time of pressing is compared with a conventional forming method in which the material is arranged so that the plate surface of the material is orthogonal to the pressing direction. The angle can be changed. That is, since the inclined surface formed by the sloping portion 10a and the draft portion 10b on the saddle surface 10 of the element 1 after pressing is convex in the center portion of the saddle surface 10 in the plate thickness direction, the element 1 and the ring 9 is prevented or suppressed from being generated per edge with respect to the inner peripheral surface 9a of the ring 9. Therefore, it is possible to form the transmission belt element 1 that prevents the stress concentration due to the edge contact and the generation of excessive stress and improves the durability of the transmission belt B.

  The present invention is not limited to the specific examples described above. In the above-described specific example, the element 1 of the type in which the saddle surfaces 10 are formed at the two left and right positions in the width direction (left and right direction in FIG. 1) as shown in FIG. For example, as shown in FIG. 7, an element 1 ′ of a type in which a saddle surface 10 ′ is formed on the bottom surface of a concave portion in the central portion in the width direction (left and right direction in FIG. 7) is shown. It can also be the subject of the invention.

  Further, in the above-described specific example, for convenience of explanation, a molding method and a molding apparatus for molding one element 1 from a plate-like material 25 by press working are described. A plurality of (many) elements 1 can be formed.

  Further, in the above-described specific example, as an example of forming the element 1 by the press forming apparatus M, the material 25 is fixed by the plate presser 22 and the die 23 which is a fixing member, and the periphery of the shearing portion of the material 25 is compressed, thereby punching In this example, the material 25 is compressed by the material 21 and the ejector 24, and the material 25 is punched by moving the punch 21 and the ejector 24 in the vertical direction. For example, the punch 21 with the ejector 24 as a fixing member is shown. The material 25 is fixed and compressed by the ejector 24 and compressed, the periphery of the shearing portion of the material 25 is compressed by the plate retainer 22 and the die 23, and the plate retainer 22 and the die 23 are moved in the vertical direction to compress the material. The element 1 can be formed by punching 25.

  And in the specific example mentioned above, although the transmission belt B made into object by this invention has shown the example used for a belt type continuously variable transmission, for example, the transmission belt B made into this invention is belt type The present invention can be applied not only to a continuously variable transmission but also to a transmission belt of another winding transmission device constituted by a transmission belt (V belt) and a V pulley.

It is a schematic diagram which shows the structure of the transmission belt and the element for transmission belts made into object by this invention, Comprising: It is the front view. It is a schematic diagram which shows the structure of the transmission belt and the element for transmission belts made into object by this invention, Comprising: It is the side view. It is a perspective view which shows a part of power transmission belt made into object by this invention. It is a schematic diagram which shows the structure of the shaping | molding method and shaping | molding apparatus of the element for transmission belts concerning this invention. It is a schematic diagram for demonstrating the plate-shaped raw material supplied when shape | molding an element in the shaping | molding method of the element for transmission belts concerning this invention. It is a schematic diagram for demonstrating the shape of the saddle surface of the element shape | molded with the shaping | molding method and shaping | molding apparatus of the element for transmission belts concerning this invention. It is a schematic diagram for demonstrating the plate-shaped raw material supplied when shape | molding the element for other types of transmission belts made into object by this invention, and the element. It is a schematic diagram which shows the structure of the shaping | molding method and shaping | molding apparatus of the conventional element for power transmission belts. It is a schematic diagram for demonstrating the shape of the saddle surface of the element shape | molded with the shaping | molding method and the shaping | molding apparatus of the conventional element for transmission belts. It is the reference example of the shape measurement data of the saddle surface of the element shape | molded with the shaping | molding method of the conventional element for power transmission belts, and a shaping | molding apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Element, 1a, 1b ... Side surface, 1c ... Inner peripheral side edge, 1d ... Outer peripheral side edge, 9 ... Ring, 9a ... Inner peripheral surface, 10 ... Saddle surface, 21 ... Punch (molding die), 22 ... Plate pressing (molding die), 23 ... Die (molding die), 24 ... Ejector (molding die), 21a, 23a, 24a ... Press surface (inclined surface), 22a ... Pressing surface (inclined surface), 25 ... Material, 25a , 25b ... plate surface, B ... transmission belt, M ... molding device, P ... plane perpendicular to the pressing direction.

Claims (4)

A method of forming an element constituting a transmission belt by arranging a plurality of plate-like individuals in an annular shape facing each other with their postures aligned, and binding them by a ring, the elements being bound by the ring In the forming method of the element for a transmission belt, the element having a saddle surface that comes into contact with the inner peripheral surface of the ring is formed by press working that compresses and punches a plate-shaped material.
The material is arranged in a state in which the plate surface of the material is inclined with respect to a plane orthogonal to the pressing direction in the press working, and the element is formed by performing the pressing in that state. A method for forming a transmission belt element.   The outer peripheral side end when the element of the one plate surface is formed into the element with respect to the plane including the inner peripheral side end when the element of the one plate surface is formed into the element is the press working. 2. The method for forming a power transmission belt element according to claim 1, wherein the inclination is set in a direction away from a surface side where drooping occurs. A device for forming an element constituting a transmission belt by arranging a plurality of plate-like individuals in an annular shape facing each other with their postures aligned, and binding them with a ring, the ring comprising the ring In the forming device of the element for the transmission belt, the element having the saddle surface that comes into contact with the inner peripheral surface of the ring when being bound by the above, is formed by press working that compresses and punches a plate-shaped material.
The pressing surface and the pressing surface of the forming die that place the material during the pressing and abut against the plate surface of the material to perform the compression processing or punching processing are orthogonal to the pressing direction during the pressing. An apparatus for forming an element for a transmission belt, wherein an inclined surface inclined with respect to a flat surface is provided.   The outer peripheral side end when the element of the one plate surface is formed into the element with respect to the plane including the inner peripheral side end when the element of the one plate surface is formed into the element is the press working. 4. The device for forming an element for a transmission belt according to claim 3, wherein the inclination is set in a direction away from a surface where drooping occurs.

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