JP2015504007A - Split blanking member for punching transverse elements used in continuously variable transmission drive belts - Google Patents

Abstract

The present invention relates to a blanking member (30) for use in cutting a transverse element (10) for a continuously variable transmission drive belt from a basic material (50). The blanking member (30) is composed of two parts (30a, 30b) located opposite each other, each part (30a, 30b) cutting a different part of the transverse element (10) and at least one part (30b) is provided with a raised edge (33) extending along the seam between the two blanking member portions (30a, 30b). The blanking member (30) according to the invention forms a recess (23) in the transverse element (10), so that the basic material (50) under the influence of the force applied when cutting the transverse element (10). Is pushed into the seam to prevent the formation of a linear protrusion on top of the transverse element (10).

Description

  The present invention relates to a blanking member configured to be used in a blanking process for punching a transverse element used for a drive belt of a continuously variable transmission from a basic material, and the transverse element contacts a pulley sheave of a pulley of the continuously variable transmission. A relatively wide base portion having a pulley sheave contact surface and a support surface for supporting a carrier of the drive belt, an upper portion, and a relatively narrow neck portion interconnecting the base portion and the upper portion; . The blanking member is composed of at least two parts which are provided with a base part, a neck part and an upper part in the same way and are arranged opposite to each other, so that when punching the transverse element, One part of the blanking member forms a support surface and the other part forms at least part of the outer contour of the upper part of the transverse element.

  Furthermore, the present invention provides a blanking device in which a blanking member is used, a method of manufacturing a transverse element used for a drive belt of a continuously variable transmission, in which the blanking member is used to punch the transverse element from a basic material, The present invention relates to a transverse element manufactured using the method and a drive belt having a number of transverse elements.

  Drive belts for continuously variable transmissions are generally known. Typically, such drive belts include two endless carriers that are shaped like a closed loop to carry multiple transverse elements. The transverse elements are arranged along the entire circumference of the carrier and can transmit forces related to the movement of the drive belt during operation of the continuously variable transmission.

  In the following description of the transverse element, the direction described indicates that the transverse element is part of the drive belt. The thickness direction of the transverse element corresponds to the circumferential direction of the drive belt. The vertical lateral direction of the transverse element corresponds to the radial direction of the drive belt. The horizontal transverse direction of the transverse element corresponds to a direction perpendicular to both the longitudinal and vertical transverse directions.

  In the horizontal transverse direction, the transverse element is provided on both sides with recesses that at least partly receive the carrier of the drive belt. In order to support the carrier, the transverse element is provided with a support surface. In the horizontal transverse direction, the transverse element is provided on both sides with pulley sheave contact surfaces that are spaced apart from each other in the direction of the support surface for contact between the transverse element and the pulley sheave of the pulley of the continuously variable transmission. . The terms “top” and “bottom” as used below relate to the separation direction, which is defined to be from the bottom to the top.

  In the vertical lateral direction, from the bottom to the top, the transverse elements are in order at the base part, the neck part whose horizontal lateral dimension is smaller than the horizontal lateral dimension of the base part, and the position connecting to the neck part. And an upper portion having a horizontal horizontal dimension larger than a horizontal horizontal dimension of the neck portion. The base part includes a support surface and a pulley sheave contact surface. In the drive belt, the base portion is disposed on the inner peripheral side of the drive belt, and the upper portion is disposed on the outer peripheral side of the drive belt.

  The transverse element is manufactured from a sheet-like basic material by a blanking process. In particular, this blanking process is a so-called fine blanking process, using two blanking members, a cutting member and a support member, and the cutting member is configured to cut the transverse element from the basic material under the influence of the cutting force. The support member is configured to support the transverse element with a support force smaller than the cutting force during the blanking process.

  During the blanking process, the bottom or working surface of the cutting member contacts and penetrates part of the basic material under pressure, and relative movement between the transverse element to be punched and the surrounding basic material is achieved. At the same time, the upper part or working surface of the support member contacts and supports the same part of the basic material opposite to the cutting member. In this way, that part of the basic material, which is the part indicating the transverse element to be punched out, is cut off from the surrounding basic material.

  Both the cutting member and the support member can distinguish the base part, the neck part and the upper part as well as the transverse element to be punched. The outer periphery of both the cutting member and the support member is substantially equal to the desired outer periphery of the transverse element. In the following, it is assumed that the various directions defined for the transverse element are equally related to the blanking member.

  At least one of the cutting member and the support member may comprise at least two portions. For example, Japanese Patent Application Laid-Open No. 2010-029918 shows a cutting member having two parts, and International Publication No. 2008/051070 shows a supporting member having two parts.

  Using a blanking member that is divided into two parts has many advantages over using an integral blanking member. With the split blanking member, the formation process of the transverse element during the blanking process can be controlled in a better manner. This is because, since the force spreading during the blanking process is more evenly distributed, the tilting movement of the transverse element that is punched out is suppressed. Another advantage is the fact that parts of both blanking members can be loaded separately, thereby improving the overall accuracy of the transverse element formed. In addition, a surface coating or surface treatment can be (simplely) applied to the blanking member portion by dividing it into two blanking member portions. Such coatings and / or treatments reduce the wear of each of the blanking member (s) and / or improve punching results in terms of, for example, the accuracy and / or finish of the surface formed by blanking. Sometimes desirable. In particular, such a coating or treatment is suitable at the location of the surface of the cutting member defining and forming the recesses of the transverse element.

  A disadvantage or even a problem with split blanking members is that two or more parts of the blanking member can be separated from each other at the seam between them under the influence of pressure and force spreading during the blanking process. It is. Such separation or seams between the parts of the blanking member usually remain very small, but the basic material is pushed into such seams, which makes it slightly higher on the surface of the transverse element after blanking. It still happens that ridges or linear protrusions are formed. Such ridges usually adversely affect the operation of the drive belt of the transmission. First, during operation of the drive belt, the ridges will more or less prevent certain ideally aligned contacts between adjacent transverse elements. Second, some of the ridge material wears very easily, causing problems in other parts of the transmission, such as abrasive wear and / or clogging in the transmission hydraulic system.

  It is an object of the present invention to reduce the adverse effects of ridges or protrusions in a blanking process incorporating a split blanking member, and preferably prevent such ridges or protrusions from being formed from the beginning. . The purpose of this is to divide the machined surface of at least one part of the split blanking member with a raised edge extending along the seam between one part and the other part of the blanking member. This is achieved by the die blanking member.

  When using the split blanking member of the present invention, a recess is formed in the transverse element at the location of the seam between the blanking member portions. Due to the nature of the blanking process, the recess is smoothly joined on both sides via a rounded edge to the adjacent part at a high position on the surface of the transverse element. As a result, the formation of the ridges described above is prevented, or at least such ridges can be completely accommodated in the recesses. At the same time, the advantages known to be provided by using split blanking members are maintained.

  In a preferred embodiment of the blanking member of the present invention, the raised edge has a protruding height in the range of 10 to 150 micrometers, preferably 20 to 50 micrometers, with respect to the main part of the blanking member working surface. Is equipped. Optimal results have been achieved with the present invention with a protrusion height of about 30 micrometers. Furthermore, the width of the raised edge is preferably larger than the protruding height of the raised edge (for example, 10 times). Therefore, the preferred range for its width is 100-1500 micrometers, and the practical optimum is about 300 micrometers. Usually these dimensions are sufficient to accommodate the negatively raised ridges.

  Within the scope of the invention, both of the parts of the split blanking member can be provided with the above-mentioned raised edges, in each case extending along and directly adjacent to the seam between those parts. . In the blanking member of this embodiment, raised ridges or linear protrusions on the surface of the transverse element can still be formed at the location of the seam between the blanking member portions. However, such a ridge or protrusion is in this case accommodated in a recess formed in the transverse element by a raised edge of the part of the blanking member.

  The invention will be explained in more detail on the basis of the following description of preferred embodiments of the invention with reference to the drawings. The same reference numbers indicate the same or similar parts.

It is a schematic side view of the continuously variable transmission provided with the drive belt. FIG. 3 is a schematic view of the body surface of a transverse element for a continuously variable transmission drive belt. FIG. 3 is a side view of the transverse element shown in FIG. 2. It is a schematic longitudinal cross-sectional view of the blanking region of the blanking device and the basic material disposed therein. It is the schematic of a blanking process. It is a schematic perspective view of the division | segmentation type | mold blanking member of an assembly state. FIG. 7 is a schematic exploded perspective view of the split blanking member shown in FIG. 6. FIG. 3 is a schematic exploded perspective view of a split blanking member modified according to the present invention. FIG. 9 is a schematic cross-sectional view of the new split blanking member of FIG. 8 modified according to the present invention.

  FIG. 1 is a schematic diagram of a continuously variable transmission particularly suitable for use in a motor vehicle. The continuously variable transmission is indicated generally by the reference numeral 1.

  The continuously variable transmission 1 includes two pulleys 4 and 5 arranged on separate pulley shafts 2 and 3. The drive belt 6 formed like a closed loop is arranged around the pulleys 4 and 5 and serves to transmit torque between the pulley shafts 2 and 3. Each of the pulleys 4 and 5 includes two pulley sheaves, and the drive belt 6 is disposed and fixed between the two pulley sheaves, whereby force is transmitted between the pulleys 4 and 5 and the drive belt 6 by friction. Is done.

  The known drive belt 6 comprises two endless carriers 7 formed in a closed loop for carrying a number of transverse elements 10. Usually, each carrier 7 is composed of a plurality of relatively thin and flexible, i.e. ribbon-like rings. The transverse elements 10 are arranged along the entire circumference of the carrier 7, the transverse elements 10 being adjacent and movable in the circumferential direction with respect to the carrier 7. Only a few of these transverse elements 10 are shown in FIG. 1 for the sake of simplicity. Both carrier 7 and transverse element 10 are made of metal.

  2 and 3 show an example of a known transverse element 10. The first body surface of the transverse element 10 is indicated generally by the reference numeral 11 and the second body surface of the transverse element 10 is indicated generally by the reference numeral 12. The main body surfaces 11 and 12 extend at least partially perpendicular to the circumferential direction of the drive belt 6. In the drive belt 6, at least part of the first body surface 11 of the transverse element 10 is in contact with at least part of the second body surface 12 of the adjacent transverse element 10, and the second of the transverse element 10 At least a portion of the body surface 12 is in contact with at least a portion of the first body surface 11 of another adjacent transverse element 10. A side surface 13 of the transverse element 10 is arranged between the body surfaces 11, 12.

  In the vertical lateral direction, the transverse element 10 includes, in order, a base portion 14, a relatively narrow neck portion 15, and an upper portion 16. In the drive belt 6, the base portion 14 is disposed on the inner peripheral side of the drive belt 6, and the upper portion 16 is disposed on the outer peripheral side of the drive belt 6. At the transition to the neck 15, as shown in FIG. 2, the base part 14 of the transverse element 10 comprises two support surfaces 17, and the two support surfaces 17 support the two carriers 7 of the drive belt 6. And is part of the side 13 of the transverse element 10. The upper part 16 is provided with two holding surfaces 19. Each of the two holding surfaces 19 is disposed to face one of the support surfaces 17, functions to hold the carrier 7 in the vertical lateral direction, and is also a part of the side surface 13. Further, the base portion 14 includes two pulley sheave contact surfaces 18. Each of the two pulley sheave contact surfaces 18 is disposed on each side surface of the base portion 14 in the horizontal lateral direction, functions to contact the pulley sheaves of the pulleys 4 and 5, and is also a part of the side surface 13.

  On the first body surface 11 of the transverse element 10 a projection 21 is arranged. In the example shown, the protrusion 21 is disposed in the upper portion 16 and corresponds to the hole 22 in the second body surface 12. In the drive belt 6, the protrusion 21 of the transverse element 10 is at least partially arranged in the hole 22 of the adjacent transverse element 10. The protrusion 21 and the corresponding hole 22 function to prevent mutual displacement of the adjacent transverse elements 10 in a plane perpendicular to the circumferential direction of the drive belt 6.

  The transverse element 10 described above is manufactured by a blanking device 60 in a blanking process, particularly a so-called fine blanking process, and the transverse element 10 is cut out from a sheet-like basic material 50. FIG. 4 shows a schematic cross-sectional view of the blanking device 60 and the sheet-like basic material 50. In the blanking device 60, the cutting member 30 and the support member 40 are used. The cutting member 30 functions to cut the transverse element 10 during the blanking process, and the support member 40 functions to support the transverse element 10 during the blanking process. In the present specification, the bottom or processed surface 31 of the cutting member 30 and the upper or processed surface 41 of the support member 40 are pressed against the basic material 50 on opposite sides of the basic material 50. Accordingly, these processed surfaces 31 and 41 have a contour substantially corresponding to the outer peripheral shape of the transverse element 10 to be punched, that is, a contour substantially along the contour of the side surface 13 of the transverse element 10. Therefore, like the transverse element 10, in the cutting member 30 and the support member 40, the base portion, the relatively narrow neck portion, and the upper portion can be distinguished.

  The cutting member 30 is accommodated in a guide space 61 of a guide plate 62 having an important function of guiding the cutting member 30 during a punching operation. Similarly, the support member 40 is accommodated in an accommodation space 63 of a mold 64 having an important function of guiding both the support member 40 and the transverse element 10 during a punching operation. Furthermore, the receiving space 63 naturally has a shape substantially along the outer peripheral shape of the transverse element 10 to be punched.

  Thus, in the blanking process, the basic material 50 is disposed between the cutting member 30 and the guide plate 62 on the one hand and between the support member 40 and the mold 64 on the other hand. A portion 51 of the basic material 50 disposed between the cutting member 30 and the support member 40 is configured to form the transverse element 10. During the blanking step, the cutting member 30 moves toward the support member 40 with respect to the guide plate 62 and the mold 64, and the support member 40 moves following the movement of the cutting member 30 while applying an opposite pressure. As shown in FIG. 5, the cutting member 30 is pressed completely through the basic material 50, and the transverse element 10 is formed by cutting the blanking portion 51 from the remaining basic material 50.

  Further, during the blanking step, the main body surfaces 11 and 12 of the transverse element 10 are formed by each (opposite) pressure applied to the blanking portion 51 by the cutting member 30 and the support member 40, and for example, the protrusion 21 and the hole Is adjusted by forming 22. It should also be noted that in the latter case, the base material 50 can be completely planar or rectangular in cross section, although stepped or otherwise pre-formed base material 50 can also be used.

  In connection with the above-described blanking apparatus and blanking process, it is known to use the cutting member 30 and / or the support member 40 divided into separable parts. As an example, FIG. 6 shows a schematic perspective view of a split-type cutting member 30 having two portions 30a and 30b. The two portions 30a, 30b combine when used in the blanking device 60 of FIGS. 4 and 5 as shown in FIG. 6, but as shown in FIG. Otherwise it is completely separate and / or separable. For the sake of simplicity, it should be noted that the protrusions of the cutting member 30 that are necessary to form the recesses 22 in the transverse element 10 are not shown in FIGS. In this respect, it is actually possible to use another element to form the recess 22 in the transverse element 10, the cutting member 30 having a recess in which the element is accommodated, and the element being a cutting member Note that the other parts of the 30 are arranged so as to be movable.

  6 and 7, the seam 32 between the two portions 30 a and 30 b of the split-type cutting member 30 is formed as a straight line at the neck portion 15 of the transverse element 10. Thirty-two other shapes and positions are possible in the concept of the present invention. In this arrangement, it is important that the cutting member portions 30a, 30b be in precise and intimate contact with substantially no play at the location of the seam 32 between them. Nevertheless, in practice, even though the contact between the cutting member portions 30a, 30b is optimal, these portions 30a, 30b are separated from each other under the influence of the pressure and force spreading on the portions 30a, 30b during blanking. May cause the base material 50 to be pushed between the portions 30a, 30b, so that the slightly raised ridges or linear protrusions are in this example the second of the neck 15 of the transverse element 10 1 on the surface 11 of the main body. Such ridges are relatively limited in height, for example 30 micrometers, but as described above, they may still adversely affect the operation of the drive belt 6 of the transmission 1.

  According to the present invention, the formation of such an adversely raised ridge is raised on at least one part 30a, 30b of the split blanking member 30, 40 with respect to another part of the work surface 31, 41, and This can be prevented by providing a raised edge 33 extending along the seam 32 between one part 30a, 30b of each blanking member 30, 40 and the other part 30a, 30b. Although in this case the cutting member 30, such new blanking members 30, 40 are shown schematically and non-scaled in FIG.

  In FIG. 8, a raised edge 33 is provided on the uppermost portion 30 b of the split-type cutting member 30 intended to cut the upper portion 16 of the transverse element 10. Therefore, during the blanking step, the upper surface 34 of the raised edge 33 comes into contact with the basic material prior to the (remaining) processed surface 31; 31a, 31b of the split-type cutting member 30, and the material 51 of the transverse element 10 is When cut from the remaining basic material, the transverse element 10 has a linear shape extending over the (local) width of the transverse element 10 at the location of the seam 32 between the two parts 30a, 30b of the cutting member 30. A dent or recess 23 is formed (see FIG. 9). It is understood that the depression 23 having a bad influence is not formed by forming the recess 23 at the time of blanking.

  The cross-sectional shape of the transverse element 10 in the vicinity of the position where the two parts 30a, 30b of the cutting member 30 join is schematically shown in FIG. In FIG. 9, the recess 23 provided in the transverse element 1 as described above is connected to an adjacent portion at a high position on the body surface 11 of the transverse element 10 via a round edge 24. It is shown.

  In the above description, it is described that the raised edge portion 33 is provided in a specific portion of the split-type cutting member 30, that is, the uppermost portion 30b. However, it is sufficiently possible to provide such a raised edge 33 on the other lowermost part 30a of the cutting member 30 or on both of its parts 30a, 30b. In addition or as an alternative, the portions 40a, 40b of the split support member 40 can be provided with corresponding raised edges.

  The scope of the invention is not limited to the examples described above, and various modifications and variations of the invention are possible without departing from the scope of the invention as defined by the appended claims. It will be apparent to those skilled in the art.

Claims (11)

A blanking member (30) configured for use in a blanking step of cutting a transverse element (10) used for a drive belt (6) of a continuously variable transmission (1) from a basic material (50),
The blanking member (30) forms a machined surface (31) composed of at least two parts (30a, 30b) configured to contact the basic material (50) in the blanking step. The blanking member portions (30a, 30b) are arranged to face each other via a seam (32) and each form part of the processed surface (31). In the ranking member (30), at least one blanking member portion (31b) is adjacent to the joint (32) and is an upper surface (a part of the processed surface (31) of the blanking member (30)). Blanking member (30), characterized in that it comprises a raised edge (33) with 34).   The upper surface (34) of the raised edge portion (33) of the one blanking member portion (31b) is a part of the processing surface (31) directly adjacent to the raised edge portion (33). The blanking member (30) of claim 1, wherein the blanking member (30) is positioned at least 10 micrometers and up to 150 micrometers above.   The upper surface (34) of the raised edge portion (33) of the one blanking member portion (31b) is a part of the processing surface (31) directly adjacent to the raised edge portion (33). The blanking member (30) of claim 1, wherein the blanking member (30) is located 20-30 micrometers above.   The raised edge (33) extends along the entire length of the seam (32) between the blanking member portions (30a, 30b) and has a width of 100-1500 micrometers. A blanking member (30) according to any one of claims 1 to 3.   The blanking member (30) is configured to penetrate the basic material (50) in the blanking step in order to cut the transverse element (10) from the basic material (50). The blanking member (30) according to any one of claims 1 to 4. The outer periphery of the blanking member (30) is substantially equal to the outer periphery of the transverse element (10) to be punched,
The transverse element (10) includes a pulley sheave contact surface (18) that contacts the pulleys (4, 5) of the continuously variable transmission (1) and a support surface (17) that supports the carrier (7) of the drive belt (6). ) Having a relatively wide base portion (14), an upper portion (16), and a relatively narrow neck portion (15) connecting the base portion (14) and the upper portion (16). And
The blank (1) according to any one of claims 1 to 5, wherein the seam (32) between the parts (30a, 30b) of the blanking member is arranged facing the neck (15). Ranking member (30).   Blanking device (60), characterized in that it comprises a blanking member (30) according to any one of the preceding claims.   7. A method of manufacturing a transverse element (10) for use in a drive belt (6) of a continuously variable transmission (1), wherein the blanking member (30) or claim 1 according to any one of claims 1-6. Method according to claim 7, characterized in that the transverse element (10) is cut from the basic material (50) using the blanking device (60) according to item 7. A transverse element (10) used for a drive belt (6) of a continuously variable transmission (1),
The transverse element (10) includes a pulley sheave contact surface (18) that contacts the pulleys (4, 5) of the continuously variable transmission (1) and a support surface (17) that supports the carrier (7) of the drive belt (6). ) Having a relatively wide base portion (14), an upper portion (16), and a relatively narrow neck portion (15) connecting the base portion (14) and the upper portion (16). And
The blanking member (30) according to any one of claims 1 to 6, the blanking device (60) according to claim 7, or the manufacturing according to claim 8. Transverse element (10), characterized in that it is manufactured by a method. A transverse element (10) used for a drive belt (6) of a continuously variable transmission (1),
The transverse element (10) includes a pulley sheave contact surface (18) that contacts the pulleys (4, 5) of the continuously variable transmission (1) and a support surface (17) that supports the carrier (7) of the drive belt (6). ) Having a relatively wide base portion (14), an upper portion (16), and a relatively narrow neck portion (15) connecting the base portion (14) and the upper portion (16). And
Transverse element (10), characterized in that the neck (15) of the transverse element (10) comprises a linear recess (23) extending across the width of the neck (15).   Drive belt (6) of continuously variable transmission (1), characterized in that it comprises one or more transverse elements according to claim 9 or 10.

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