JP2013130204A - Method for manufacturing element for continuously variable transmission and element manufactured by the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing an element for a continuously variable transmission, which can reduce slip friction loss between an element and a metal ring by decreasing an effect of a punching sag thereby improving a fuel cost, and to provide an element manufactured by the method.SOLUTION: A method for manufacturing an element 10 for a continuously variable transmission is disclosed. The element includes: body parts 11, 21 whose side parts slidingly contact with a pulley constituting the continuously variable transmission; and a head part 13 communicated with an upper end of the body part via a neck part 12 and having a larger width than the neck part, wherein an endless metal ring is pinched between the body part and the head part. The body part is split into a first body part 11 and a second body part 21 in a plate thickness direction. A first element 1 communicating the first body part 1 with the head part via the neck part, and a second element 2 having the second body part are provided. The first element and the second element are press-punched and then overlapped.

Description

  The present invention relates to a method for manufacturing an element for a continuously variable transmission that constitutes a drive belt that circulates between a drive shaft pulley and a driven shaft pulley of a vehicle, and an element manufactured by the method.

In a continuously variable transmission mounted on a vehicle, for example, a belt-type continuously variable transmission in which a drive belt in which a plurality of elements are engaged with a metal ring is operated between a drive shaft pulley and a driven shaft pulley. The machine is used. This continuously variable transmission has been widely applied to vehicles having a relatively small engine output. However, in recent years, the application of the continuously variable transmission has been expanded to vehicles with a large engine output because of the improved fuel economy and smooth transmission.
In general, since many elements are used in the drive belt, the elements are manufactured by press punching a strip-shaped metal plate from the viewpoint of improving productivity and yield. For example, Patent Documents 1 and 2 disclose a technique for manufacturing an element by press punching.

By the way, the power of the continuously variable transmission is transmitted by the frictional force between the elements when the side (inclined surface) of the element comes into contact with the tapered groove formed by the drive shaft pulley and the driven shaft pulley. In order to ensure the frictional force, the pulley is composed of a fixed pulley and a movable pulley, and has a structure in which the element is narrowed by pressing the movable pulley toward the fixed pulley. Each element is bound by a metal ring so that the driving belt maintains an annular shape facing the pressing force.
Therefore, the upper end (saddle surface) of the body part of the element is in contact with the inner peripheral surface of the metal ring. Here, the upper end of the body portion of the element that is in contact with the inner peripheral surface of the metal ring is referred to as a “saddle surface”. FIG. 8 is an explanatory diagram of the contact operation between the saddle surface of the element and the inner peripheral surface of the metal ring.

  As shown in FIG. 8, when the plurality of elements W10 and W11 move in the direction of the arrow X within the pulley, the front element W11 receives the frictional force with the pulley (not illustrated), It inclines backward (arrow Y direction). Due to the shift amount α between the tilting fulcrum (herein referred to as “pitch line”) W102 and the saddle surface W101 of the subsequent element W10, the metal ring SR and the elements W10, W11 are moved between the metal ring SR and the element W10 Sliding occurs and sliding friction loss occurs between the element and the metal ring. As the displacement amount α increases, the sliding friction loss between the metal ring SR and the elements W10 and W11 increases, and it is desired to reduce the displacement amount α in order to improve fuel efficiency.

JP 2001-246428 A JP 2010-89122 A

  However, in the case where the belt-shaped metal plate is manufactured by press punching as in the techniques of Patent Documents 1 and 2, considering the friction loss between the element and the metal ring, the pitch line W102 and the saddle surface W101 described above are used. Although it is desired to reduce the amount of deviation α, there is a limit to reducing the amount of deviation α due to a sag generated during press punching. FIG. 6 shows a cross-sectional view of a mold in the middle of processing for punching out a conventional element with a press mold 500.

  As shown in FIG. 6, the element W10 is pressed in the direction of the arrow S10 while holding the metal plate Z10 in the direction of the arrow T10 with the plate holder 751 and sandwiching the punch 651 and the ejector 851 in the directions of the arrows P10 and Q10. When this is done, the die 551 is punched by biting into the metal plate Z10. The corner portion of the punched ridge line is plastically deformed by the tensile load at the time of shearing accompanying punching, and a sag W103 is formed on the upper end 8511 side of the ejector 851. FIG. 7 shows an enlarged view of the B part (sagging part) of the element punched by the press die shown in FIG.

As shown in FIG. 7, the pitch line W102 is formed by transferring the shape of the polygonal line of the ejector 851 to the surface of the element W10, but in the sag portion, the mold (ejector) and the material (metal plate) are not in contact with each other. As a result, the mold shape cannot be transferred. Therefore, the shift amount D between the pitch line W102 and the saddle surface 101 cannot be made smaller than the width C of the sag W103.
Therefore, in the techniques of Patent Documents 1 and 2, the sliding friction loss between the element and the metal ring remains large, and it is difficult to reduce this.

  The present invention has been made to solve the above-described problems, and by reducing the influence of punching sagging, an element for continuously variable transmission can reduce sliding friction loss between the element and the metal ring to improve fuel efficiency. It is an object of the present invention to provide a manufacturing method and an element manufactured by the method.

In order to solve the above-described problems, a continuously variable transmission element manufacturing method of the present invention and an element manufactured by the method have the following configurations.
(1) having a body part whose side part is in sliding contact with a pulley constituting the continuously variable transmission, and a head part wider than the neck part connected from the upper end of the body part via the neck part, A method for manufacturing an element for a continuously variable transmission, wherein an endless metal ring is sandwiched between a body part and the head part,
The first element and the second body part, wherein the body part is divided into a first body part and a second body part in the thickness direction, and the head part is connected to the first body part via the neck part. A second element having
The first element and the second element are respectively overlapped on a surface on which a sag is generated by press punching after press punching.

(2) In the method for manufacturing a continuously variable transmission element described in (1),
Forming a pitch line in the second body part;
A claw portion for locking the lower end of the second body portion is formed at the lower end of the first body portion.

(3) having a body part whose side part is slidably contacted with a pulley constituting the continuously variable transmission, and a head part wider than the neck part connected from the upper end of the body part via the neck part, A continuously variable transmission element having an endless metal ring sandwiched between a body portion and the head portion,
The first element and the second body part, wherein the body part is divided into a first body part and a second body part in the thickness direction, and the head part is connected to the first body part via the neck part. A second element having
The first element and the second element are overlapped with each other on a surface on which sagging occurs during press punching.

Next, the manufacturing method of the element for continuously variable transmission which concerns on this invention, and the effect | action and effect of the element manufactured by the said method are demonstrated.
(1) A body portion having a side portion slidably in contact with a pulley constituting the continuously variable transmission, and a head portion wider than a neck portion continuously provided from the upper end of the body portion via the neck portion, Is a method for manufacturing an element for a continuously variable transmission having an endless metal ring sandwiched between a body portion and a head portion, and the body portion is divided into a first body portion and a second body portion in the plate thickness direction. And a first element having a head portion connected to the first body portion via a neck portion and a second element having a second body portion, and the first element and the second element are respectively subjected to press punching The first element and the second element are arranged on the outer side on the side where no sagging occurs in the press punching process. Here, since the surface on the side where no sagging occurs contacts the mold (ejector) and no gap is generated, the shape of the mold can be transferred reliably. Therefore, the pitch line can be formed close to the saddle surface without being affected by the sag caused by the press punching process.
From the above, according to the invention of (1), it is possible to improve the fuel consumption by reducing the sliding friction loss between the element and the metal ring without being affected by the punching sagging.

(2) In the method for manufacturing a continuously variable transmission element described in (1), the pitch line is formed in the second body portion, and the lower end of the second body portion is locked to the lower end of the first body portion. Since the claw portion is formed, the lower end of the second body portion only needs to be locked to the claw portion formed at the lower end of the first body portion when the first element and the second element are assembled. . Therefore, the first element and the second element can be easily assembled, and the second element does not fall (separate) from the first element even during operation.
From the above, according to the invention of (2), in addition to the effect of improving the fuel consumption by reducing the sliding friction loss between the element and the metal ring, the effect of improving the assemblability of the first element and the second element is achieved. Can play.

(3) A body portion having a side portion slidably in contact with a pulley constituting the continuously variable transmission, and a head portion wider than the neck portion continuously provided from the upper end of the body portion via the neck portion, And an endless metal ring sandwiched between the head portion and the continuously variable transmission element, wherein the body portion is divided into a first body portion and a second body portion in the thickness direction, A first element having a head portion connected to a first body portion via a neck portion and a second element having a second body portion are provided, and the first element and the second element are each sagged by press punching. Since they are overlapped on the side surface, the sliding friction loss between the element and the metal ring can be reduced and the fuel efficiency can be improved without being affected by punching sagging.

It is a front view of the element for continuously variable transmission which is embodiment which concerns on this invention. It is a side view (F view) of the element shown in FIG. FIG. 3 is an enlarged view of part A of the element shown in FIG. 2. FIG. 3 is a cross-sectional view of a mold in the middle of processing for punching out the first element shown in FIG. 2 with a press mold. FIG. 3 is a cross-sectional view of a mold in the middle of processing for punching the second element shown in FIG. 2 with a press mold. FIG. 10 is a cross-sectional view of a mold in the middle of processing for punching a conventional element with a press die. It is the B section (sagging part) enlarged view of the element pierced with the press die shown in FIG. It is explanatory drawing of contact operation | movement with the saddle surface of an element, and the internal peripheral surface of a metal ring.

  Next, a method for manufacturing a continuously variable transmission element (hereinafter referred to as “element”) according to the present invention and an embodiment of the element manufactured by the method will be described in detail with reference to the drawings. FIG. 1 shows a front view of a continuously variable transmission element according to an embodiment of the present invention. FIG. 2 shows a side view (view F) of the element shown in FIG. FIG. 3 is an enlarged view of a portion A of the element shown in FIG.

<Element structure>
As shown in FIGS. 1 and 2, the element 10 is divided into a first body portion 11 and a second body portion 21 in the plate thickness direction. The element 10 includes a first element 1 in which a head portion 13 is connected to a first body portion 11 via a neck portion 12 and a second element 2 having a second body portion 21.
The first body portion 11 has a substantially rectangular shape, and a first placement surface 112 is formed on a side overlapping the second body portion 21, and a first operation is provided on the side facing the first placement surface 112. A surface 114 is formed. The first placement surface 112 and the first operation surface 114 are flat surfaces parallel to each other.

  A neck portion 12 extending upward with a predetermined width is formed at the upper end center of the first body portion 11, and a head portion 13 wider than the width of the neck portion is continuously provided at the upper end of the neck portion 12. The plate thickness of the neck portion 12 is a thickness obtained by adding the plate thickness of the first body portion 11 and the plate thickness of the second body portion 21. Therefore, a stepped portion 121 is formed at the lower end of the neck portion 12 on the boundary line with the first body portion 11.

  The head portion 13 has a substantially isosceles triangle shape, and includes bottom portions 131A and 131B extending in the width direction from both ends of the neck portion 12. The outermost peripheral surfaces of the metal rings SR1 and SR2 are in contact with the bottom side. Near the center of gravity of the head portion 13, an embossed convex portion 132 is formed on the front side of the element 10, and a concave portion 133 having the same shape is formed on the back side. When the plurality of elements 10 are overlapped in the plate thickness direction, the projections 132 of the subsequent element are fitted into the recesses 133 of the previous element, and are positioned with respect to each other.

  First saddle surfaces 115 </ b> A and 115 </ b> B extending in the width direction from both ends of the neck portion 12 are formed on the left and right of the upper end of the first body portion 11 so as to face the bottom portions 131 </ b> A and 131 </ b> B of the head portion 13. The innermost peripheral surfaces of the metal rings SR1 and SR2 are in contact with the first saddle surface. When the first saddle surfaces 115A and 115B are in contact with the metal rings SR1 and SR2, the driving force from the drive shaft is driven to the driven shaft while maintaining the drive belt in an annular shape facing the pressing force received from the pulley (not shown). Communicating.

Side portions 117 </ b> A and 117 </ b> B that are in contact with a cone surface of a pulley (not shown) are formed on both side ends of the first body portion 11. The side portions 117A and 117B are in contact with the cone surface of the pulley, and the driving force from the pulley is transmitted to the drive belt by the frictional force of the contact portion.
At the lower end of the first body portion 11, concave curved portions 118A and 118B are formed on the left and right, and claw portions 113A and 113B are formed at the intersections of the concave curved portions and the side portions. The claw portions 113A and 113B are engaged with the lower end of the second body portion 21. For example, when the side portions 117A and 117B are not in contact with the cone surface of the pulley, the second element 2 falls from the first element 1. Prevents (separation).

As shown in FIGS. 1 and 2, the second body portion 21 of the second element 2 has a substantially rectangular shape, and a second placement surface 214 is formed on the side overlapped with the first body portion 11. A second operation surface 211 is formed on the side facing the second placement surface 214. The second placement surface 214 comes into contact with the first placement surface 112 of the first body portion 11 when the first element 1 and the second element 2 are assembled.
The second operation surface 211 is a flat surface, but when the element 10 rotates in the pulley, the second operation surface 211 is positioned downward so as not to interfere with the first operation surface 114 of the element even if the previously disposed element is inclined. It is inclined so that the thickness of the plate becomes thinner. A foot end surface 213 is formed below the second operation surface 211 with a back cut portion 212 therebetween. The foot end surface 213 is a flat surface parallel to the second placement surface 214, and the plate thickness is reduced by the thickness of the back cut portion 212. This is to further secure a gap with the first operation surface 114 of the element disposed in front.

  Second saddle surfaces 215A and 215B are formed on the left and right sides of the upper end of the second body portion 21 so as to face the bottom portions 131A and 131B of the head portion 13, respectively. The second saddle surfaces 215A and 215B are formed so that their vertical positions are the same as the vertical positions of the first saddle surfaces 115A and 115B, and are in contact with the innermost peripheral surfaces of the metal rings SR1 and SR2. Yes.

  As shown in FIGS. 1 and 3, pitch lines 216 </ b> A and 216 </ b> B extending in the width direction are formed at the upper end of the second operation surface 211. As described above, the pitch lines 216A and 216B serve as fulcrums when the inner circumferential side is inclined backward with respect to the traveling direction due to the frictional force with the pulley when the element 10 turns in the pulley. Due to the amount of deviation between the pitch line and the saddle surface, slippage occurs between the metal ring and the element when turning inside the pulley, and sliding friction loss between the element and the metal ring occurs. In this embodiment, in order to reduce sliding friction loss as much as possible, the first element 1 and the second element 2 are overlapped on the surface on which the sag 1151, 151 is generated by press punching, and sag is generated by press punching. The first operation surface 114 and the second operation surface 211 are formed on the side facing the side surface, and pitch lines 216A and 216B are formed on the second operation surface 211.

Since burrs are generated on the ridgeline on the second operation surface 211, the burrs are removed by polishing or the like. A minute R2152 is formed at the corner of the ridgeline from which burrs are removed. Pitch lines 216A and 216B are formed on or in the vicinity of the R stop line (the tangent line between the second operation surface 211 and the minute R1152) of the minute R2152 on the second operation surface 211. The minute R2152 formed at the corner portion of the ridge line from which burrs are removed is extremely smaller than the sag 2151 generated by press punching. Therefore, the amount of deviation between the second saddle surface 215 and the pitch lines 216A and 216B can be greatly reduced as compared with the case where the pitch line is formed on the surface where the sagging occurs.
The ridgeline of the first operation surface 114 is also formed by a minute R1152 from which burrs are removed. Therefore, the pitch lines 216A and 216B formed on the second operation surface 211 abut on or near the R stop line (tangent line between the first operation surface 114 and the minute R1152) of the minute R1152 on the first operation surface 114.

<Press punching method>
FIG. 4 shows a cross-sectional view of the mold in the middle of the process of punching out the first element shown in FIG. 2 with a press mold. FIG. 5 shows a cross-sectional view of the mold in the middle of the process of punching out the second element shown in FIG. 2 with a press mold.
First, a press punching method for the first element 1 will be described.
As shown in FIG. 4, the first element is manufactured by punching a band-shaped metal plate Z <b> 1 with a press die 100. The press die 100 includes a punch 61 and a plate presser 71 in an upper die, and a die 51 and an ejector 81 in a lower die. The punch 61 is fixed to the upper die, and the die 51 is fixed to the lower die.

  First, the metal plate Z <b> 1 is placed on the upper end 512 of the die 51. At that time, the upper end 811 of the ejector 81 rises to the upper end 512 of the die 51. Next, when the upper die is lowered in the direction of the arrow S1, the lower end 711 of the plate presser 71 comes into contact with the metal plate Z1 in advance and presses the metal plate Z1 in the direction of the arrow T1. The presser load of the plate presser 71 is generated by a deflection of a compression spring (not shown) or hydraulic pressure. The presser load of the plate presser 71 acts so that the metal plate Z1 does not move from the upper end 512 of the die 51 during punching.

  Thereafter, the punch 61 fixed to the upper die comes into contact with the metal plate Z1. The lower end 611 of the punch 61 is lowered while sandwiching the upper end 811 of the ejector 81 and the metal plate Z1. By holding the metal plate Z1 between the lower end 611 of the punch 61 and the upper end 811 of the ejector 81, warping of the metal plate Z1 is suppressed.

  As the punch 61 descends, the cutting edge 511 of the die 51 bites into the metal plate Z1 and shears the metal plate Z1. The cutting edge 511 of the die 51 is formed with an inclined surface 513 that opens upward. By forming the inclined surface 513, the plastic flow at the time of shearing is facilitated, the formation of the shearing surface is promoted, and the formation of the fracture surface is suppressed. During this shearing, a tensile load acts on the ridgeline of the metal plate Z1 from the blade edge 511 of the die 51. The ridgeline of the metal plate Z1 is plastically deformed by the action of the tensile load. The plastically deformed portion becomes sagging.

  On the other hand, a minute clearance is set between the side end surface 614 of the punch 61 and the cutting edge 511 of the die 51. Burr at the time of shearing occurs on the ridgeline of the metal plate Z1 along the clearance gap. However, the ridgeline of the metal plate Z1 is pressed by the lower end 611 of the punch 61, and no sagging occurs.

Further, when the upper die is lowered and reaches the bottom dead center, the ejector 81 is in a bottomed state, and the metal plate Z1 is compressed and plastically deformed by the lower end 611 of the punch 61 and the upper end 811 of the ejector 81, and The shapes of the lower end 611 of the punch and the upper end 811 of the ejector are transferred to the surface of the metal plate Z1. At this time, the claw portions 113 </ b> A and 113 </ b> B are formed at the lower end of the first body portion 11 by the claw-shaped wall 812 of the ejector 81. Thereafter, when the ejector 81 is raised after the upper die is raised, the first element 1 subjected to press punching can be taken out.
As described above, the first element 1 is manufactured by press punching.

Next, a method for pressing the second element 2 will be described.
As shown in FIG. 5, the second element is manufactured by punching a band-shaped metal plate Z <b> 2 with a press die 200. The press die 200 includes a punch 62 and a plate presser 72 in the upper die, and a die 52 and an ejector 82 in the lower die. The punch 62 is fixed to the upper die, and the die 52 is fixed to the lower die.

  First, the metal plate Z <b> 2 is placed on the upper end 522 of the die 52. At that time, the upper end 821 of the ejector 82 rises to the upper end 522 of the die 52. Next, when the upper die is lowered in the direction of the arrow S2, the lower end 721 of the plate presser 72 presses the metal plate Z2 in the direction of the arrow T2 in advance. The presser load of the plate presser 72 is generated by a deflection of a compression spring (not shown) or hydraulic pressure. The presser load of the plate presser 72 acts so that the metal plate Z2 does not move from the upper end 522 of the die 52 at the time of punching.

  Thereafter, the punch 62 fixed to the upper die comes into contact with the metal plate Z2. Lower ends 621, 622, and 623 of the punch 62 descend while sandwiching the upper end 821 of the ejector 82 and the metal plate Z2. By holding the metal plate Z2 between the lower ends 621, 622, and 623 of the punch 62 and the upper end 821 of the ejector 82, warping of the metal plate Z2 is suppressed. Of the lower ends 621, 622, and 623 of the punch 62, a back wall 622 that forms the back cut part 212 of the second body part 21 and an inclined wall 623 that forms the second operation surface 211 of the second body part 21, A part of the gap is formed between the metal plate Z2 and the bottom plate at the bottom dead center.

  As the punch 62 descends, the cutting edge 521 of the die 52 bites into the metal plate Z2 and shears the metal plate Z2. An inclined surface 523 that opens upward is formed on the blade edge 521 of the die 52. By forming the inclined surface 523, plastic flow during shearing is facilitated, formation of the shearing surface is promoted, and formation of a fracture surface is suppressed. During this shearing, a tensile load acts on the ridge line of the metal plate Z2 from the blade edge 521 of the die 52. The ridgeline of the metal plate Z2 is plastically deformed by the action of the tensile load. The plastically deformed portion becomes sagging.

  On the other hand, a minute clearance is set between the side end surface 624 of the punch 62 and the cutting edge 521 of the die 52. Burr at the time of shearing occurs on the ridgeline of the metal plate Z2 along the clearance gap. However, the ridgeline of the metal plate Z2 is pressed by the lower ends 621 and 623 of the punch 62, and no sagging occurs.

Further, when the upper die is lowered and reaches the bottom dead center, the ejector 82 is bottomed, and the metal plate Z2 is compressed by the lower ends 621, 622, and 623 of the punch 62 and the upper end 821 of the ejector 82 to be plastic. While deforming, the shapes of the lower ends 621, 622, and 623 of the punch and the upper end 821 of the ejector are transferred to the surface of the metal plate Z2. Thereafter, since the upper die is raised and the ejector 82 is raised, the second element 2 subjected to press punching can be taken out.
As described above, the second element 2 is produced by press punching.

<Effect>
According to the present embodiment, the first element 1 and the second element 2 are overlapped on the surface on which the sagging occurs in the press punching process, so the first element 1 and the second element 2 are A surface on the side where no sagging occurs in the press punching process is disposed on the outside. Here, since the surface on the side where no sagging occurs contacts the mold (ejector) and no gap is generated, the shape of the mold can be transferred reliably. Therefore, the pitch lines 216A and 216B can be formed in the vicinity of the saddle surfaces 115A, 115B, 215A, and 215B without being affected by sagging due to press punching.
From the above, according to the present embodiment, the fuel consumption can be improved by reducing the sliding friction loss between the element 10 and the metal rings SR1 and SR2 without being affected by the punching sagging.

  In addition, according to the present embodiment, the side portions 117A, 117B, 217A, and 217B are in sliding contact with the pulleys constituting the continuously variable transmission, and the upper end of the body portion is connected via the neck portion 12 from the upper end of the body portion. A continuously variable transmission element 10 having a head portion 13 wider than the neck portion provided and having endless metal rings SR1 and SR2 sandwiched between the body portions 11 and 21 and the head portion 13. The first element in which the body part is divided into the first body part 11 and the second body part 21 in the thickness direction, and the head part 13 is connected to the first body part 11 via the neck part 12. 1 and the second element 2 having the second body portion 21, and the first element 1 and the second element 2 are overlapped on the surface on which the sagging occurs in the press punching process, Punching Without being affected by sagging, it is possible to improve the fuel consumption by reducing the sliding friction loss between the element 10 and the metal ring SR1, SR2.

This embodiment mentioned above can be changed in the range which does not change the summary of this invention.
For example, in the present embodiment, the first element 1 and the second element 2 are overlapped on the surface on the side where the sag 1151, 1511 is generated by press punching, and the side facing the surface on which the sag is generated by press punching The first operation surface 114 and the second operation surface 211 are formed on the second operation surface 211, and pitch lines 216A and 216B are formed on the second operation surface 211. However, by making the plate thickness of the second body portion 21 of the second element thinner than the plate thickness of the first body portion 11 of the first element, the sag generated by the press punching process is reduced. It is also possible to form the second operation surface 211 on the resulting surface. In this case, since the step part 121 between the first body part 11 and the neck part 12 can be made small, there is also an effect that molding with a bottom at the bottom dead center becomes easy.

  INDUSTRIAL APPLICABILITY The present invention can be used as a method for manufacturing a belt-type continuously variable transmission element that constitutes a drive belt that circulates between a drive shaft pulley and a driven shaft pulley of a vehicle, and an element manufactured by the method.

DESCRIPTION OF SYMBOLS 1 1st element 2 2nd element 10 Element 11 1st body part 12 Neck part 13 Head part 21 2nd body part 51,52 Die 61,62 Punch 71,72 Plate holder 81,82 Ejector 100,200 Press type 112 First 1 mounting surface 113 claw portion 114 first operation surface 115 first saddle surface 117, 217 side portion 211 second operation surface 214 second mounting surface 215 second saddle surface 216 pitch line 1151 sag 2151 sag

Claims (3)

A body part whose side part is in sliding contact with a pulley constituting the continuously variable transmission, and a head part wider than the neck part connected from the upper end of the body part via the neck part, and the body part; A method for manufacturing an element for a continuously variable transmission, wherein an endless metal ring is sandwiched between the head portion and the head portion,
The first element and the second body part, wherein the body part is divided into a first body part and a second body part in the thickness direction, and the head part is connected to the first body part via the neck part. A second element having
A method for manufacturing an element for a continuously variable transmission, wherein the first element and the second element are overlapped on a surface on which a sag is generated by press punching after press punching. In the manufacturing method of the element for continuously variable transmission described in Claim 1,
Forming a pitch line in the second body part;
A method for manufacturing an element for a continuously variable transmission, wherein a claw portion for locking the lower end of the second body portion is formed at the lower end of the first body portion. A body part whose side part is in sliding contact with a pulley constituting the continuously variable transmission, and a head part wider than the neck part connected from the upper end of the body part via the neck part, and the body part; An element for a continuously variable transmission having an endless metal ring sandwiched between the head portion,
The first element and the second body part, wherein the body part is divided into a first body part and a second body part in the thickness direction, and the head part is connected to the first body part via the neck part. A second element having
An element for a continuously variable transmission, wherein the first element and the second element are overlapped with each other on a side where sag occurs in press punching.

Images