JP2018083200A - Manufacturing method of metal element for continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To equalize a plate thickness of a metal element when manufacturing the metal element having a recess at a rear face by pressing it by using metal molds, and to reduce press loads.SOLUTION: Since an inclined face correspondence part 30' of a metal element raw material 23' and inclined face formation parts 47b, 47c of metal molds 48, 49 are parallel with each other, and abut on each other without a clearance, press loads necessary for forming a metal element 23 are suppressed to the minimum, the durability of the metal molds 48, 49 can be enhanced, and in addition to this, recesses 24a, 26a are formed at both rear faces of an ear part 26 and a body part 24 of the metal element 23 by pressing by using the metal molds 48, 49. Therefore, a plate thickness difference between the inside and outside of the metal element 23 in a radial direction can be reduced by preventing inclinations of the metal molds by adjusting sizes of both the recesses 24a, 26a, and by changing a distribution of the press loads at the inside and outside of the metal molds 48, 49 in the radial direction.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a method for manufacturing a metal element for a continuously variable transmission, in which a metal element for a continuously variable transmission is manufactured by pressing and punching a strip-shaped metal element material having a constant cross section using a die. About.

  In the manufacturing method of metal elements used for metal belts of belt-type continuously variable transmissions, the metal element material roughly formed into a shape close to the shape of the metal element product is pressed with a die consisting of a main punch and counter punch and finished. Patent Document 1 below discloses a technique for improving the accuracy of the shape in the vicinity of the rocking edge of the metal element while ensuring the durability of the mold by molding.

  In addition, the position of the rocking edge of the metal element used for the metal belt of the belt type continuously variable transmission is made to coincide with the front edge position of the saddle surface which is the radially outer end position of the front surface of the body portion of the metal element. By forming a recess in the rear surface of the neck portion and ear portion of the metal element, when the rear metal element is displaced radially outward with respect to the front metal element, the body portion of the rear metal element is inclined. Japanese Patent Application Laid-Open No. 2004-26853 discloses a technique in which the surface is brought into contact with the body portion of the metal element on the front side in the entire length in the width direction and the bending load applied to the portion where the neck portion is connected to the body portion is reduced to suppress the bending of the neck portion. Is known.

Japanese Patent No. 4132820 WO1014 / 196254

  By the way, when a metal element is manufactured by pressing a metal element material with a die made of a main punch and a counter punch, the thickness of the metal element becomes non-uniform, and the thickness of the ear portion is equal to the radial outer end of the body portion. When a large number of metal elements are in close contact with each other at a string portion of a metal belt wound around a drive pulley and a driven pulley to transmit a driving force, the metal thickness may vary depending on the plate thickness. There is a possibility that the transmission efficiency of the driving force is lowered due to the bending of the string portion of the belt.

  The present invention has been made in view of the above circumstances, and when pressing and manufacturing a metal element having a recess on the rear surface with a mold, it is possible to make the plate thickness of the metal element uniform and reduce the pressing load. Objective.

  To achieve the above object, according to the first aspect of the present invention, a pair of ring slots into which a pair of metal rings are fitted, a neck portion positioned between the pair of ring slots, and the neck portion An ear part continuous to the radially outer side of the neck part, and a body part formed with a saddle surface supporting the inner peripheral surface of the metal ring connected to the radially inner side of the neck part. A strip-shaped metal element material having a constant cross section is formed of a metal element formed with a locking edge that overlaps the front edge of the saddle surface and extends in the left-right direction, and an inclined surface that extends radially inward and rearward from the locking edge. A method of manufacturing a metal element for a continuously variable transmission manufactured by pressing and punching using a mold, wherein the metal element material has an inclined surface corresponding portion and The inclined surface molding part of the metal mold is parallel to each other and comes into contact with no gap, and a recess is formed on the rear surface of both the ear part and the body part of the metal element by pressing with the metal mold. A method of manufacturing a metal element for a continuously variable transmission is proposed.

  According to the invention described in claim 2, in addition to the structure of claim 1, a material recess is formed in advance on the front surface or the rear surface of the neck portion corresponding portion of the metal element material to be pressed by the mold. A method for manufacturing a metal element for a continuously variable transmission according to claim 1 is proposed.

  The third recess 24a and the fourth recess 24b of the embodiment correspond to the recess of the body portion of the present invention, and the second recess 26a of the embodiment corresponds to the recess of the ear portion of the present invention. The counter punch 47 and the main punch 49 correspond to the mold of the present invention, and the first inclined surface molding portion 47b and the second inclined surface molding portion 47c of the embodiment correspond to the inclined surface molding portion of the present invention.

  According to the configuration of the first aspect, since the inclined surface corresponding portion of the metal element material and the inclined surface forming portion of the mold are in parallel with each other and contact with each other without a gap, the press load required for forming the metal element The durability of the mold can be improved by minimizing the depth of the mold, and the recesses are formed by pressing with the mold on the back of both the ear and body parts of the metal element. By adjusting and changing the distribution of the press load inside and outside in the radial direction of the mold, the inclination of the mold can be prevented and the difference in the plate thickness between the inside and outside in the radial direction of the metal element can be reduced.

  According to the second aspect of the present invention, since the material concave portion is formed in advance on the front surface or the rear surface of the neck portion corresponding portion of the metal element material to be pressed by the mold, the convex portion of the mold is the material of the metal element material. By punching the recesses, or by pressing the metal element material pressed by the convex part of the mold and flowing into the material recesses, the press load is reduced and the mold durability is increased. Due to this reduction, a moment can be generated in the mold to control the difference in thickness between the inside and outside of the metal element in the radial direction.

The figure which shows the whole structure of a belt-type continuously variable transmission. (First embodiment) The perspective view of a metal belt and a metal element. (First embodiment) Single item drawing of metal element. (First embodiment) FIG. 3B is an enlarged view of FIG. (First embodiment) The perspective view of a metal element material. (Embodiment) Sectional drawing of a punching device and a metal element material. (First embodiment) Action explanatory drawing corresponding to FIG. (First embodiment) Action explanatory drawing corresponding to FIG. (First embodiment) Action | operation explanatory drawing at the time of position shift of a metal element. (First embodiment) Action | operation explanatory drawing at the time of the press work of a metal element. (Second Embodiment) The figure corresponding to FIG. (Third embodiment)

First embodiment

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 shows a schematic structure of a belt-type continuously variable transmission T mounted on an automobile. The belt-type continuously variable transmission T has a drive shaft 11 connected to an engine and a driven shaft 12 connected to drive wheels. An endless metal belt 15 is wound around a drive pulley 13 provided on the drive shaft 11 and a driven pulley 14 provided on the driven shaft 12. The drive pulley 13 includes a fixed-side pulley half 16 fixed to the drive shaft 11 and a movable-side pulley half 17 that can be brought into and out of contact with the fixed-side pulley half 16. The half body 17 is biased toward the stationary pulley half body 16 by hydraulic pressure acting on the oil chamber 18. The driven pulley 14 includes a fixed-side pulley half 19 fixed to the driven shaft 12 and a movable-side pulley half 20 that can be brought into and out of contact with the fixed-side pulley half 19. The half body 20 is biased toward the fixed pulley half body 19 by hydraulic pressure acting on the oil chamber 21.

  As shown in FIGS. 2 to 4, the metal belt 15 is configured by supporting a number of metal elements 23 on a pair of left and right metal rings 22. In this specification, the direction in which the metal belt 15 travels is defined as the front in the front-rear direction, and the outer peripheral side of the drive pulley 13 and the driven pulley 14 is the diameter with the metal belt 15 wound around the drive pulley 13 and the driven pulley 14. The direction is defined as the outside of the direction, and the direction orthogonal to the front-rear direction and the radial direction is defined as the left-right direction. The metal element material 23 ′ (see FIG. 5), which is the material of the metal element 23, and the punching apparatus 41 (see FIG. 6) for forming and punching the metal element 23 from the metal element material 23 ′ are also used. The directions corresponding to the front-rear direction, radial direction, and left-right direction are defined as the front-rear direction, radial direction, and left-right direction.

  The metal element 23 manufactured from the metal element material 23 ′ has a body portion 24 extending in the left-right direction, a neck portion 25 extending radially outward from the center in the left-right direction of the body portion 24, and a radially outer end of the neck portion 25. A pair of ring slots 27 are formed between the body portion 24, the neck portion 25, and the ear portion 26 so as to open outward in the left-right direction and fit the metal ring 22. The A saddle surface 28 on which the inner peripheral surface of the metal ring 22 is seated is formed at the radially outer end of the body portion 24 facing the ring slot 27, and a rocking edge extending in the left-right direction at the radially outer end of the front surface of the body portion 24. 29 is formed, and an inclined surface 30 that is inclined radially inward and backward from the rocking edge 29 is formed on the front surface of the body portion 24. The locking edge 29 overlaps the front edge of the saddle surface 28, and therefore the locking edge 29 is located at the radially outer end of the front surface of the body portion 24.

  Pulley contact surfaces 31 that contact the V surfaces of the drive pulley 13 and the driven pulley 14 are formed on the left and right ends of the body portion 24 of the metal element 23. In addition, a frustoconical nose 32 that can be fitted into a frustoconical hole 33 formed on the rear surface of the ear part 26 is formed on the front surface of the ear part 26 of the metal element 23.

  The inclined surface 30 of the metal element 23 includes a first inclined surface 30a inclined radially inward and rearward from the rocking edge 29 at a first inclination angle θ1, and a second inclined angle from the radially inner end of the first inclined surface 30a. It comprises a second inclined surface 30b that is inclined inward and backward in the radial direction at θ2, and the front-rear direction plate thickness of the body portion 24 gradually decreases radially inward within the range of the inclined surface 30.

  A flat first concave portion 25a is formed on the rear surface of the neck portion 25 of the metal element 23, and a flat second concave portion 26a is formed at the center in the left-right direction on the rear surface of the ear portion 26 of the metal element 23. . The first recess 25a and the second recess 26a have the same depth and are continuous with each other. The radially inner end of the first recess 25a and the rear edge of the ring slot 27 are aligned in the radial direction. Furthermore, a rectangular third recess 24 a is formed at the center in the left-right direction of the radially inner end of the rear surface of the body portion 24 of the metal element 23.

  The plate thickness in the front-rear direction of the body portion 24 is the maximum plate thickness t1 at the position of the rocking edge 29. This maximum plate thickness t1 is equal to the plate thickness t2 in the front-rear direction of the flat portion 26b, which is a portion other than the second recess 26a of the ear portion 26. Match. Further, the plate thickness of the first concave portion 25a of the neck portion 25 and the plate thickness of the second concave portion 26a of the ear portion 26 are such that the first concave portion 25a and the second concave portion 26a are larger than the maximum plate thicknesses t1 and t2. T3 which is smaller by the depth of.

  Therefore, in the chord portion of the metal belt 15 that extends linearly from the drive pulley 13 toward the driven pulley 14, the front surface of the ear portion 26 of the rear metal element 23 is the flat portion 26 b of the ear portion 26 of the front metal element 23. The rocking edge 29 of the rear metal element 23 comes into contact with the upper end (the rear edge of the saddle surface 28) of the body portion 24 of the front metal element 23. Further, the rear metal element 23 can swing with respect to the rear surface of the front metal element 23 with a rocking edge 29 as a fulcrum, so that the metal belt 15 can be wound around the drive pulley 13 and the driven pulley 14. .

  As shown in FIG. 5, the metal element material 23 ′, which is a material for manufacturing the metal element 23, is composed of a strip-shaped metal plate that has been rolled so as to have a constant cross section in the longitudinal direction. The metal element material 23 ′ includes an ear part corresponding part 26 ′, a neck part corresponding part 25 ′, and a body part corresponding part 24 ′ corresponding to the ear part 26, the neck part 25 and the body part 24 of the metal element 23, respectively. A material recess 34 extending in a groove shape along the longitudinal direction of the metal element material 23 'is formed on the front surface of the neck portion corresponding portion 25' of the metal element material 23 '. The material recess 34 is located in front of the first recess 25 a of the neck portion 25 of the metal element 23.

  The ear portion corresponding portion 26 ′ has a constant thickness substantially the same as the plate thickness t 2 of the flat portion 26 b of the ear portion 26, and the neck portion corresponding portion 25 ′ is smaller by the depth of the material recess 34. The neck portion 25 has a constant thickness substantially equal to the thickness t3 of the neck portion 25. The body portion corresponding portion 24 ′ has substantially the same plate thickness as the maximum plate thickness t 1 of the body portion 24 at a position corresponding to the locking edge 29, and the plate thickness decreases radially inward from there. In other words, the inclined surface corresponding portion 30 'of the body portion corresponding portion 24' of the metal element material 23 'corresponds to the first inclined surface inclined inward and rearward in the radial direction at the first inclination angle θ1 from the rocking edge corresponding portion 29'. Part 30a ′ and a second inclined surface corresponding part 30b ′ inclined radially inward and rearward at a second inclination angle θ2 from the radial inner end of the first inclined surface corresponding part 30a ′.

  As described above, the cross-sectional shape of the metal element material 23 ′ is such that the part corresponding to the nose 32 and the hole 33 of the ear part 26, the part corresponding to the first recess 25 a of the neck part 25, and the second part of the ear part 26. It differs from the cross-sectional shape of the metal element 23 in that it does not have a portion corresponding to the recess 26a and has a material recess 34.

  As shown in FIG. 6, the punching device 41 for punching the metal element 23 from the metal element material 23 ′ is capable of moving up and down on the lower die 43 fixed to the lower part of the frame body 42 and the upper part of the frame body 42. An upper die 45 that is supported and driven up and down by a die drive cylinder 44, a counter punch 47 that is fitted into a recess 43a that is open on the upper surface formed in the lower die 43 and is driven up and down by a counter punch drive cylinder 46, and an upper side And a main punch 49 which is engaged with a concave portion 45a formed on the lower surface of the die 45 and is driven up and down by a main punch driving cylinder 48.

  The contour shapes of the counter punch 47 and the main punch 49 are the same as the contour shape of the metal element 23, and the counter punch 47 has a nose forming portion 47 a for forming the nose 32 of the metal element 23 and the first shape of the metal element 23. A first inclined surface forming portion 47b for forming the first inclined surface 30a and a second inclined surface forming portion 47c for forming the second inclined surface 30b of the metal element 23 are formed. A hole forming portion 49a for forming the hole 33 of the element 23, a first recessed portion forming portion 49b for forming the first recessed portion 25a of the neck portion 25 of the metal element 23, and a first of the ear portion 26 of the metal element 23. 2nd concave part forming part 49c for forming the concave part 26a and the third concave part 24a of the body part 24 of the metal element 23 A third recess forming portion 49d for shape is formed. Since the first concave portion 25a and the second concave portion 26a of the metal element 23 are formed to be continuous, the first concave portion forming portion 49b and the second concave portion forming portion 49c of the main punch 49 are also formed to be continuous.

  The first inclined surface forming portion 47b and the second inclined surface forming portion 47c of the counter punch 47 are parallel to the first inclined surface corresponding portion 30a 'and the second inclined surface corresponding portion 30b' of the metal element material 23 ', respectively. Both the first inclined surface forming portion 47b and the first inclined surface corresponding portion 30a ′ are inclined by the first inclination angle θ1, and both the second inclined surface forming portion 47c and the second inclined surface corresponding portion 30b ′ are the second inclination angle θ2. Just tilt. Therefore, when the metal element 23 is press-molded, the first inclined surface forming portion 47b and the second inclined surface forming portion 47c of the counter punch 47 are respectively connected to the first inclined surface corresponding portion 30a 'and the second inclined surface forming portion 47c of the metal element material 23'. It abuts on the inclined surface corresponding part 30b ′ without a gap.

  Next, the effect by the shape of the metal element 23 provided with the said structure is demonstrated.

  The metal belt 15 wound around the drive pulley 13 and the driven pulley 14 transmits the driving force by the pushing force of the string portion that linearly extends from the drive pulley 13 toward the driven pulley 14. In the string portion, the metal elements 23 are aligned in parallel to each other, whereas in the winding portion where the metal belt 15 is wound around the pulleys 13 and 14, the metal element 23 has a radial attitude centered on the axis of the pulleys 13 and 14. In order to change, the distance between the radially outer ends of the adjacent metal elements 23 increases, and the relative swinging occurs so that the distance between the radially inner ends decreases. At that time, the rocking edge 29 of the rear metal element 23 contacting the rear surface of the front metal element 23 serves as a fulcrum, and the front and rear metal elements 23 are relatively pitched within the gap between the nose 32 and the hole 33 ( The posture can be changed by swinging back and forth.

  Further, the metal element 23 of the present embodiment has the locking edge 29 formed at the front end of the saddle surface 28, and the radial height of the locking edge 29 and the radial height of the saddle surface 28 coincide with each other. When the metal element 23 is pitched at the winding portion, the saddle surfaces 28 of the adjacent metal elements 23 are prevented from being separated in the front-rear direction, and slippage occurs between the saddle surface 25 and the inner peripheral surface of the metal ring 22. It is avoided that the power transmission efficiency is reduced. If the locking edge 29 is provided radially inward of the saddle surface 28, the saddle surfaces 28 of the adjacent metal elements 23 are separated in the front-rear direction when the metal elements 23 are pitched at the winding portion. In addition to slippage between the saddle surface 28 and the inner peripheral surface of the metal ring 22, the power transmission efficiency is lowered because the metal ring 22 is stretched.

  By the way, the adjacent metal element 23 is positioned by the tension of the metal ring 22 in which the nose 32 of the rear metal element 23 is fitted into the hole 33 of the front metal element 23 and the saddle surface 28 is pressed radially inward. However, since there is a gap between the nose 32 and the hole 33, it is inevitable that the metal element 23 is displaced in the radial direction at the string portion.

  FIG. 9 shows the operation when the metal element 23 of the present embodiment is displaced in the radial direction. 9A and 9B show a state in which the rear metal element 23 is displaced radially inward with respect to the front metal element 23. In this case, the first and second recesses 25a, 26a does not function, but the entire length of the locking edge 29 of the rear metal element 23 abuts on the rear surface of the body portion 24 of the front metal element 23, so that the neck portion 25 does not bend and the transmission efficiency of the driving force is reduced. Will not drop.

  On the other hand, as shown in FIGS. 9C and 9D, when the rear metal element 23 is displaced radially outward with respect to the front metal element 23, the rear metal element 23 is locked. The center portion in the width direction of the edge 29 enters the first and second recesses 25a and 26a on the rear surface of the neck portion 25 of the metal element 23 on the front side, so that the center portion in the width direction of the body portion 24 of the metal element 23 on the rear side. While the inclined surface 30 is in sliding contact with the radially inner edges of the first and second recesses 25a and 26a, the rear metal element 23 moves forward so as to approach the front metal element 23 while moving radially outward. can do.

  In this way, by moving the rear metal element 23 forward so as to approach the front metal element 23 while moving radially outward, both end portions in the width direction of the inclined surface 30 of the rear metal element 23 are moved. Since the contact with the rear end of the saddle surface 28 of the front metal element 23 is maintained, the driving force can be transmitted over the entire length of the inclined surface 30 in the width direction. Since the bending load applied to the portion connected to the head is reduced and the bending of the neck portion 25 is suppressed, the reduction in the transmission efficiency of the driving force can be minimized.

  Further, since the flat portions 26b at both ends in the width direction of the rear surface of the ear portion 25 sandwiching the first and second concave portions 25a and 26a are aligned at the same height as the rear surface of the body portion 24, the metal element 23 is connected to the drive pulley 13 and the driven pulley. 14, the front metal element 23 and the rear metal element 23 are not only in contact with each other at the rocking edge 29, but the rear metal element 23 is also in the front portion 26 b of the ear portion 26. It contacts the rear surface of the metal element 23. As a result, the metal elements 23 which are on the chord part and are not displaced in the radial direction abut against each other without pitching by abutting at three locations of the pair of flat parts 26b and the locking edge 29 of the ear part 26. It can be aligned in parallel to maintain a stable posture.

  9C and 9D, the rear metal element 23 is displaced radially outward with respect to the front metal element 23, and the locking edge 29 of the rear metal element 23 is When moved forward so as to enter the ring slot 2 of the front metal element 23 and the first and second recesses 25a and 26a, the ear part 26 of the rear metal element 23 is the ear part of the front metal element 23. Since it cannot move forward because it interferes with the flat portion 26b of the No. 26, the radial outer end of the rear metal element 23 tends to fall backward. However, since the flat portion 26b of the ear portion 26 can be easily elastically deformed forward at the connection portion with the second recess 26a, the front side of the locking edge 29 of the rear metal element 23 follows the front side. The flat part 26b of the ear part 26 of the metal element 23 is elastically deformed forward, so that the adjacent metal elements 23 before and after can maintain a mutually parallel positional relationship.

  Next, the effect in the manufacturing process of the metal element 23 is demonstrated.

  As shown in FIG. 6, the metal element material 23 ′ manufactured in advance is placed on the lower die 43 and the counter punch 47 of the punching device 41. Subsequently, as shown in FIG. 7, the upper die 45 is lowered by the die drive cylinder 44, and the metal element material 23 ′ is sandwiched and fixed between the lower die 43 and the upper die 45, and then the main punch drive cylinder 48. The main punch 49 is lowered, and the metal element material 23 ′ is sandwiched between the counter punch 47 and the main punch 49 and is pressed.

  As a result, the nose 32 and the hole 33 of the metal element 23 are formed by the nose forming portion 47a of the counter punch 47 and the hole forming portion 49a of the main punch 49, and the first inclined surface forming portion 47b and the second inclined surface of the counter punch 47 are formed. The first inclined surface 30a and the second inclined surface 30b of the metal element 23 (that is, the first inclined surface corresponding portion 30a 'and the second inclined surface corresponding portion 30b' of the metal element material 23'b) are formed by the forming portion 47c, The first concave portion 25a, the second concave portion 26a, and the third concave portion 24a of the metal element 23 are formed by the first concave portion forming portion 49b, the second concave portion forming portion 49c, and the third concave portion forming portion 49d of the main punch 49, respectively.

  At this time, the first inclined surface forming portion 47b and the second inclined surface forming portion 47c of the counter punch 47 are spaced from the first inclined surface corresponding portion 30a ′ and the second inclined surface corresponding portion 30b ′ of the metal element material 23 ′, respectively. Therefore, it is possible to reduce the pressing load by minimizing the amount of the material that is pressed by the counter punch 47 and flows.

  Further, the meat of the neck portion corresponding portion 25 ′ of the metal element material 23 ′ pressed by the first recess forming portion 49b of the main punch 49 is pushed into the material concave portion 34 formed in advance on the front surface of the neck corresponding portion 25 ′, The front surface of the neck portion 25 of the metal element 23 after the pressing is flattened.

  When the press forming of the metal element 23 is completed in this way, the counter punch 47 and the main punch 49 are moved to the counter punch driving cylinder 46 and the main punch driving with respect to the lower die 43 and the upper die 45 as shown in FIG. The metal element 23 is punched from the metal element material 23 ′ by being relatively lowered by the cylinder 48.

  By the way, as shown in FIG. 7, when the main punch 49 is lowered by the main punch driving cylinder 48 and the metal element material 23 ′ is pressed between the counter punch 47 and the main punch 49 and pressed, it is positioned radially outward. The counter punch 47 tilts in the direction of arrow A due to the second recess forming portion 49c of the main punch 49 receiving the reaction force from the metal element material 23 ', and the maximum thickness t1 of the body portion 24 is flat in the ear portion 26. In some cases, the thickness may be smaller than the thickness t2 of the portion 26b.

  However, according to the present embodiment, the counter punch 47 is inclined in the direction of arrow B by the third recessed portion forming portion 49d of the main punch 49 located radially inside receiving the reaction force from the metal element material 23 '. And the moment generated by the second recess molding portion 49c and the moment generated by the third recess molding portion 49d cancel each other, so that the main punch 49 and the counter punch 47 are maintained in a parallel state. A difference in plate thickness between the maximum plate thickness t1 of the body portion 24 and the plate thickness t2 of the flat portion 26b of the ear portion 26 decreases.

  Moreover, when the first concave portion 25a of the neck portion 25 of the metal element 23 is pressed by the first concave portion forming portion 49b of the main punch 49, the meat of the neck portion corresponding portion 25 'of the metal element material 23' is the metal element material 23 '. Since the material is extruded into the material recess 34, the load during the press working is reduced by that amount, and the durability of the punching device 41 is improved.

  As described above, according to the present embodiment, the second recessed portion 26a is formed by the second recessed portion forming portion 49c in the ear portion 26 on the radially outer side across the neck portion 25 of the metal element 23, and the radially inner side Since the third concave portion 24a is formed in the body portion 24 by the third concave portion forming portion 49d, the size of the second concave portion 26a and the third concave portion 24a is adjusted to distribute the press load inside and outside in the radial direction of the main punch 49. By changing it, the inclination of the main punch 49 can be prevented and the thickness difference between the inside and outside in the radial direction of the metal element 23 can be reduced. Further, since the press load of the first recessed portion forming portion 49b is reduced by the material recessed portion 34 of the metal element material 23 ', a moment is generated in the main punch 49 due to the reduction of the press load, so that the inner and outer radial plates of the metal element are formed. The thickness difference can be controlled with higher accuracy.

Second embodiment

  Next, a second embodiment of the present invention will be described with reference to FIG.

  In the first embodiment, the material concave portion 34 is formed on the front surface of the neck portion corresponding portion 25 ′ of the metal element material 23 ′, and the pressing load when the first concave portion 25 a is pressed on the rear surface of the neck portion 25 is reduced. However, in the second embodiment, the press load is reduced by forming the material recess 34 on the rear surface of the neck portion corresponding portion 25 ′ of the metal element material 23 ′. In this case, the first recessed portion forming portion 49b of the main punch 49 blanks the material recessed portion 34 of the metal element material 23 'to form the first recessed portion 25a. Therefore, the press load is further increased as compared with the first embodiment. Can be reduced.

Third embodiment

  Next, a third embodiment of the present invention will be described with reference to FIG.

  The third embodiment is different from the first embodiment in the configuration of the concave portion on the rear surface of the body portion 24 of the metal element 23. That is, the second recess 26a of the first embodiment is formed so as to cross the central portion in the left-right direction of the ear portion 26 inward and outward in the radial direction, but the second recess 26a of the present embodiment has the hole 23. Is formed in an annular shape so as to surround the periphery of the. Furthermore, the third embodiment includes a groove-shaped fourth recess 24 b extending in the left-right direction near the radially outer end of the body portion 24. The moment generated by the third concave portion 24a and the fourth concave portion 24b located on the radially inner side from the neck portion 25 cancels the moment generated by the second concave portion 26a located on the radially outer side from the neck portion 25. It functions to prevent the tilt of the punch 49.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, the position, shape, number, and the like of the first recess 25a, the second recess 26a, the third recess 24a, and the fourth recess 24b are not limited to those described in the embodiment, and various design changes are possible.

22 Metal ring 23 Metal element 23 'Metal element material 24 Body part 24a Third recess (recess of body part)
24b 4th recessed part (recessed body part)
25 Neck part 25 'Neck part corresponding part 26 Ear part 26a Second recess (recess of the ear part)
27 Ring slot 28 Saddle surface 29 Rocking edge 30 Inclined surface 30 'Inclined surface corresponding portion 34 Material recess 47 Counter punch (die)
47b First inclined surface molding part (inclined surface molding part)
47c Second inclined surface molding part (inclined surface molding part)
49 Main punch (die)

Claims (2)

A pair of ring slots (27) into which a pair of metal rings (22) are fitted, a neck portion (25) positioned between the pair of ring slots (27), and radially outward of the neck portion (25) A continuous ear part (26) and a body part (24) in which a saddle surface (28) supporting the inner peripheral surface of the metal ring (22) is formed continuously to the radially inner side of the neck part (25). A locking edge (29) extending in the left-right direction on the front surface of the body portion (24), overlapping the front edge of the saddle surface (28), and an inclination extending radially inward and rearward from the locking edge (29) By pressing and punching the metal element (23) formed with the surface (30) into a strip-shaped metal element material (23 ') having a constant cross section using a die (47, 49). A manufacturing method for a continuously variable transmission metal elements that structure;
The inclined surface corresponding part (30 ') of the metal element material (23') and the inclined surface molding part (47b, 47c) of the mold (47, 49) are parallel to each other without contact with each other, and Recesses (24a, 24b, 26a) are formed on the rear surfaces of both the ear part (26) and the body part (24) of the metal element (23) by pressing with the molds (47, 49). A method for producing a metal element for a continuously variable transmission. A material recess (34) is formed in advance on the front surface or the rear surface of the neck portion corresponding portion (25 ') of the metal element material (23') to be pressed by the mold (47, 49). The manufacturing method of the metal element for continuously variable transmission of Claim 1.

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