NL1042202B1 - Method for manufacturing a transverse segment for a drive belt for a continuously variable transmission and a transverse segment thus manufactured - Google Patents

Method for manufacturing a transverse segment for a drive belt for a continuously variable transmission and a transverse segment thus manufactured Download PDF

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Publication number
NL1042202B1
NL1042202B1 NL1042202A NL1042202A NL1042202B1 NL 1042202 B1 NL1042202 B1 NL 1042202B1 NL 1042202 A NL1042202 A NL 1042202A NL 1042202 A NL1042202 A NL 1042202A NL 1042202 B1 NL1042202 B1 NL 1042202B1
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Prior art keywords
transverse segment
transverse
line
segment
drive belt
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NL1042202A
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Dutch (nl)
Inventor
Gerard Hubertus Rompen Guillaume
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Bosch Gmbh Robert
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Application filed by Bosch Gmbh Robert filed Critical Bosch Gmbh Robert
Priority to NL1042202A priority Critical patent/NL1042202B1/en
Priority to JP2017249568A priority patent/JP2018111133A/en
Priority to CN201711476858.5A priority patent/CN108266494B/en
Application granted granted Critical
Publication of NL1042202B1 publication Critical patent/NL1042202B1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G5/00—V-belts, i.e. belts of tapered cross-section
    • F16G5/16—V-belts, i.e. belts of tapered cross-section consisting of several parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/02—Perforating by punching, e.g. with relatively-reciprocating punch and bed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Punching Or Piercing (AREA)
  • Pulleys (AREA)

Abstract

The present invention concerns a method for manufacturing a transverse segment (10) for a drive belt having side faces (17) where between a tilting edge (18) extends in a front main bodysurface (11) of the transverse segment (10). According to the present invention and prior to cutting the transverse segment (10) out of basic material (50), holes (90) are punched into the basic material (50) intersecting with the side faces (17) of the transverse segment (10) in line with the tilting edge (18) thereof.

Description

OctrooicentrumPatent center

NederlandThe Netherlands

Figure NL1042202B1_D0001

Θ 1042202 (21) Aanvraagnummer: 1042202 © Aanvraag ingediend: 30/12/2016Θ 1042202 (21) Application number: 1042202 © Application submitted: 30/12/2016

BI OCTROOI (51) Int. Cl.:BI PATENT (51) Int. Cl .:

F16G 5/16 (2017.01)F16G 5/16 (2017.01)

Aanvraag ingeschreven: Application registered: (73) Octrooihouder(s): (73) Patent holder (s): 23/07/2018 23/07/2018 Robert Bosch G.m.b.H. Robert Bosch G.m.b.H. te Stuttgart, Germany, DE. at Stuttgart, Germany, DE. (43) Aanvraag gepubliceerd: (43) Application published: (72) Uitvinder(s): (72) Inventor (s): (47) Octrooi verleend: (47) Patent granted: Guillaume Gerard Hubertus Rompen Guillaume Gerard Hubertus Rompen 23/07/2018 23/07/2018 te Munstergeleen. in Munstergeleen. (45) Octrooischrift uitgegeven: (45) Patent issued: 23/07/2018 23/07/2018 (74) Gemachtigde: (74) Agent: ir. G.A.J.M. Plevier te Tilburg. ir. G.A.J.M. Plover in Tilburg.

(54) METHOD FOR MANUFACTURING A TRANSVERSE SEGMENT FOR A DRIVE BELT FOR A CONTINUOUSLY VARIABLE TRANSMISSION AND A TRANSVERSE SEGMENT THUS MANUFACTURED © The present invention concerns a method for manufacturing a transverse segment (10) for a drive belt having side faces (17) where between a tilting edge (18) extends in a front main bodysurface (11) of the transverse segment (10). According to the present invention and prior to cutting the transverse segment (10) out of basic material (50), holes (90) are punched into the basic material (50) intersecting with the side faces (17) of the transverse segment (10) in line with the tilting edge (18) thereof.(54) METHOD FOR MANUFACTURING A TRANSVERSE SEGMENT FOR A DRIVE BELT FOR A CONTINUOUSLY VARIABLE TRANSMISSION AND A TRANSVERSE SEGMENT THUS MANUFACTURED © The present invention concerns a method for manufacturing a transverse segment (10) for a drive belt having side faces (17) where between a tilting edge (18) extends into a front main body interface (11) or the transverse segment (10). According to the present invention and prior to cutting the transverse segment (10) out of basic material (50), holes (90) are punched into the basic material (50) intersecting with the side faces (17) or the transverse segment (10 ) in line with the tilting edge (18) thereof.

NL BI 1042202NL BI 1042202

Figure NL1042202B1_D0002

B - BB - B

Dit octrooi is verleend ongeacht het bijgevoegde resultaat van het onderzoek naar de stand van de techniek en schriftelijke opinie. Het octrooischrift komt overeen met de oorspronkelijk ingediende stukken.This patent has been granted regardless of the attached result of the research into the state of the art and written opinion. The patent corresponds to the documents originally submitted.

METHOD FOR MANUFACTURING A TRANSVERSE SEGMENT FOR A DRIVE BELT FORMETHOD FOR MANUFACTURING A TRANSVERSE SEGMENT FOR A DRIVE BELT FOR

A CONTINUOUSLY VARIABLE TRANSMISSION AND A TRANSVERSE SEGMENT THUSA CONTINUOUSLY VARIABLE TRANSMISSION AND A TRANSVERSE SEGMENT THUS

MANUFACTUREDMANUFACTURED

This disclosure relates to a method for manufacturing a transverse segment that is destined to be part of a drive belt for a continuously variable transmission with two pulleys and the drive belt. Such a drive belt is commonly known and is mainly applied funning around and between the two transmission pulleys, which pulleys each define a V-groove of variable width wherein a respective circumference part of the drive belt is held.This disclosure relates to a method for manufacturing a transverse segment that is destined to be a part of a drive belt for a continuously variable transmission with two pulleys and the drive belt. Such a drive belt is commonly known and is mainly applied funning around and between the two transmission pulleys, which pulleys each define a V-groove or variable width with a respective circumference part of the drive belt is a hero.

A known type of drive belt comprises an essentially contiguous row of transverse segments' that are mounted on and around the circumference of an endless carrier. Each such transverse segment defines a slot for accommodating and confining a respective circumference section of the endless carrier, while allowing the transverse segments to move along the circumference thereof. The endless carrier is formed by a number of flat and thin rings that are mutually stacked in the radial direction. This particular type of drive belt, also denoted in the art as pushbelt, is known from the international patent applications WO2015/063132-A1 and WO2015/177372-A1, for example.A known type of drive belt consists of a essentially contiguous row or transverse segments that are mounted on and around the circumference or an endless carrier. Each such transverse segment defines a slot for accommodating and confining a respective circumference section or the endless carrier, while allowing the transverse segments to move along the circumference. The endless carrier is formed by a number of flat and thin rings that are mutually stacked in the radial direction. This particular type of drive belt, also denoted in the art as pushbelt, is known from the international patent applications WO2015 / 063132-A1 and WO2015 / 177372-A1, for example.

In the above and the below description, the axial, radial and circumference directions are defined relative to the drive belt when placed in a circular posture. Furthermore, a thickness dimension of the transverse segments is defined in the circumference direction of the drive belt, a height dimension of the transverse segment is defined in the said radial direction and a width dimension of the transverse segment is defined in the said axial direction.In the above and below description, the axial, radial and circumference directions are defined relative to the drive belt when placed in a circular posture. Furthermore, a thickness dimension of the transverse segment is defined in the circumference direction of the drive belt, a height dimension of the transverse segment is defined in the said radial direction and a width dimension of the transverse segment is defined in the said axial direction.

In the row of transverse segments of the drive belt, at least a part of a front main body surface of the transverse segment abuts against at least a part of a rear main body surface of a respectively preceding transverse segment in the said row, whereas at least a part of the rear main body surface of the transverse segment abuts against at least a part of the front main body surface of a respectively succeeding transverse segment. At least one of these front and rear surfaces of the transverse segment, for example the front surface includes an axially extending, convexly curved surface part. This curved surface part divides the front surface into a radially outer and a radially inner surface parts that are oriented at an angle relative to one other. Abutting transverse segments in the drive belt are able to tilt relative to one another, while remaining in mutual contact at and through such curved surface part that is therefore denoted tilting edge hereinafter. The tilting edge allows the row of the transverse segments of the drive belt to follow a local curving of the ring stacks imposed by the transmission pulleys.In the row of transverse segments of the drive belt, at least a part of a front main body surface or the transverse segment abuts against at least a part of a rear main body surface or a respectively preceding transverse segment in the said row, whereas at least a part of the rear main body surface or the transverse segment abuts against at least a part of the front main body surface or a respectively succeeding transverse segment. At least one of these front and rear surfaces of the transverse segment, for example the front surface includes an axially extending, convexly curved surface part. This curved surface divides the front surface into a radially outer and a radially inner surface that is oriented at an angle relative to one other. Abutting transverse segments in the drive belt are able to tilt relative to one another, while remaining in mutual contact and through such a curved surface part that is therefore denoted tilting edge hereher. The tilting edge allows the row of the transverse segments of the drive belt to follow a local curving of the ring stacks imposed by the transmission pulleys.

Typically the transverse segments are manufactured, i.e. cut from a strip of basic material in a known blanking process by means of a blanking device. The known blanking device comprises a die, a guide plate and a blanking punch, whereof the blanking punch is provided with an outline essentially corresponding to the outer contour of the transverse segment to be formed, while the die and guide plate are provided with internal cavities with a corresponding contour wherein the blanking punch is contained. In the known blanking process, the basic material is clamped by and between the guide plate and the die and the blanking punch is pressed through the basic material from the side of the guide plate to the side of the die, thus cutting the transverse segment out of the basic material. Typically also in the known blanking device and process, a counter punch or ejector is applied on the opposite side of the basic material relative to the blanking punch. The ejector is pressed against the basic material, exerting a counter force in the direction of the blanking punch. This latter arrangement of the blanking device allows the said main body surfaces of the transverse segment to be plastically shaped by the compressive force exerted by and between an end face of the blanking punch and an end face of the ejector. In particular, the said tilting edge is defined in the front surface of the transverse segment by the end face of the ejector.Typically the transverse segments are manufactured, i.e. cut from a strip or basic material in a known blanking process by means of a blanking device. The known blanking device comprises a die, a guide plate and a blanking punch, whereof the blanking punch is provided with an outline essentially corresponding to the outer contour of the transverse segment to be formed, while the die and guide plate are provided with internal cavities with a corresponding contour with the blanking punch is contained. In the known blanking process, the basic material is clamped by and between the guide plate and the die and the blanking punch is pressed through the basic material from the side of the guide plate to the side of the die, thus cutting the transverse segment out or the basic material. Typically also in the known blanking device and process, a counter punch or ejector is applied on the opposite side of the basic material relative to the blanking punch. The ejector is pressed against the basic material, exerting a counter force in the direction of the blanking punch. This latter arrangement of the blanking device allows the said main body surfaces of the transverse segment to be plastically shaped by the compressive force exerted by and between an end face of the blanking punch and an end face of the ejector. In particular, the said tilting edge is defined in the front surface of the transverse segment by the end face of the ejector.

It is a well-known feature of the known blanking process that, at least in the aforementioned setup thereof, so-called rollover occurs along the cut edge of the transverse segment on the front surface, i.e. ejector side thereof. Effectively, the front surface and the newly cut circumference surface of transverse segment do not meet in a sharp edge, but rather through a convexly curved transition surface there between. In the art such rollover is also known as contraction or Einzug. The said abutting transverse segment cannot contact one another in the rollover areas at the either axial sides thereof of. Effectively, the tilting edge does thus not extend over the full local width of the transverse segments, but ends at each side at some distance from the circumference surface thereof, which distance corresponds to the width of the rollover. By such reduced contact width between the abutting transverse segments, a contact stress and associated wear is disadvantageously increased. At least for this latter reason, rollover is preferably minimised.It is a well-known feature of the known blanking process that, at least in the aforementioned setup, so-called rollover occurs along the cut edge or the transverse segment on the front surface, i.e. ejector side thereof. Effectively, the front surface and the newly cut circumference surface or transverse segment do not meet in a sharp edge, but rather through a convexly curved transition surface there between. In the art such rollover is also known as contraction or Einzug. The said abutting transverse segment cannot contact another in the rollover areas at either axial sides or. Effectively, the tilting edge does not thus extend over the full local width of the transverse segments, but ends at each side at some distance from the circumference surface, which distance corresponds to the width of the rollover. By such reduced contact width between the abutting transverse segments, a contact stress and associated wear is disadvantageously increased. At least for this latter reason, rollover is preferably minimized.

According to the present disclosure, rollover can be favourably reduced and the tilting edge extends further towards the circumference surface of the transverse segment, by cutting the transverse segment from the basic material in at least two steps:According to the present disclosure, rollover can be favourably reduced and the tilting edge extends further towards the circumference surface of the transverse segment, by cutting the transverse segment from the basic material in at least two steps:

- firstly, the circumference surface of the transverse segment is partly formed by punching a hole into the basic material to the side of the transverse segment to be formed later in line with the tilting edge; and thereafter, the remainder of the contour of the transverse segment is blanked, i.e. is cut from the basic material, while simultaneously forming the tilting edge, in particular in an otherwise conventional manner.- firstly, the circumference surface of the transverse segment is partly formed by punching a hole into the basic material to the side of the transverse segment to be formed later in line with the tilting edge; and thereafter, the remainder of the contour of the transverse segment is blanked, i.e. is cut from the basic material, while simultaneously forming the tilting edge, in particular in an otherwise conventional manner.

Effectively, in the said first step it is made use of the phenomenon that by using a piercing punch with a small outside radius a high pressure is realised in the basic material during the punching process. This high pressure results in a limited rollover, in particular in comparison with the rollover of the known blanking process. Thus by punching a hole in line with the tilting edge, locally only a small rollover is formed in comparison with the rollover that is formed in the second step when cutting the remainder of the contour of the transverse segment. Preferably, two piercing punches are applied in the first step, whereby holes are punched into the basic material on both sides of the transverse segment to be formed later in line with the tilting edge.Effectively, in the said first step it is made use of the phenomenon that using a piercing punch with a small outside radius a high pressure is realized in the basic material during the punching process. This high pressure results in a limited rollover, in particular in comparison with the rollover or the known blanking process. Thus by punching a hole in line with the tilting edge, locally only a small rollover is formed in comparison with the rollover that is formed in the second step when cutting the remainder of the contour of the transverse segment. Preferably, two piercing punches are applied in the first step, or are holes punched into the basic material on both sides of the transverse segment to be formed later in line with the tilting edge.

As far as the resulting (reduced) rollover is concerned, it does not matter from what side the piercing punch penetrates the basic material. However, by having the piercing punch in the said first step engaging the basic material from the same side as the transverse segment forming blanking punch in the second step, it was found that somewhat favourably less and/or lesser burrs are formed on the contour of the transverse segment in the second step.As far as the resulting (reduced) rollover is concerned, it does not matter from what side the piercing punch penetrates the basic material. However, by having the piercing punch in the said first step engaging the basic material from the same side as the transverse segment forming blanking punch in the second step, it was found that somewhat favourably less and / or lesser burrs are formed on the contour of the transverse segment in the second step.

The above-described method for manufacturing the transverse segment will now be explained in more detail by way of example on the basis of the description below with reference to the drawing, in which:The above-described method for manufacturing the transverse segment will now be explained in more detail by way of example on the basis of the description below with reference to the drawing, in which:

figure 1 is a schematic side view of a continuously variable transmission having a drive belt;figure 1 is a schematic side view of a continuously variable transmission having a drive belt;

figure 2 is a front view of a transverse segment for a drive belt for a continuously variable transmission;figure 2 is a front view of a transverse segment for a drive belt for a continuously variable transmission;

figure 3 is a side view of the transverse segment which is shown in figure 2;figure 3 is a side view of the transverse segment which is shown in figure 2;

figure 4 schematically shows a longitudinal section of a blanking area of a blanking device, and of basic material being placed in there;figure 4 schematically shows a longitudinal section of a blanking area or a blanking device, and of basic material being placed in there;

figure 5 schematically illustrates the blanking process;figure 5 schematically illustrates the blanking process;

figure 6 is a schematic cross-section of a part of the known transverse segment, illustrating a limitation of the known blanking process in relation to the tilting edge thereof;figure 6 is a schematic cross-section of a part of the known transverse segment, illustrating a limitation of the known blanking process in relation to the tilting edge;

figure 7 illustrates a novel manufacturing method for cutting the transverse segment out of basic material in two steps;figure 7 illustrates a novel manufacturing method for cutting the transverse segment out of basic material in two steps;

figure 8 is a schematic cross-section of a part of the transverse segment, illustrating the benefit of the novel manufacturing method of figure 7 in relation to the tilting edge thereof; and figure 9 provides an exemplary embodiment of a piercing punch for use in the novel manufacturing method of figure 7.figure 8 is a schematic cross-section of a part of the transverse segment, illustrating the benefit of the novel manufacturing method or figure 7 in relation to the tilting edge; and figure 9 provides an exemplary embodiment of a piercing punch for use in the novel manufacturing method or figure 7.

Figure 1 schematically shows a continuously variable transmission, such as for utilization in a motor vehicle. The continuously variable transmission is indicated in general by the reference sign 1.Figure 1 shows schematically a continuously variable transmission, such as for utilization in a motor vehicle. The continuously variable transmission is indicated in general by the reference sign 1.

The continuously variable transmission 1 comprises two pulleys 4, 5 being arranged on separate pulley shafts 2, 3. A drive belt 6 is provided in a closed loop around the pulleys 4, 5 and serves for transmitting torque between the pulley shafts 2, 3. The pulleys 4, are each provided with two pulley sheaves, wherein the drive belt is positioned and clamped between said two pulley sheaves, so that with the help of friction a force may be transmitted between the pulleys 4, 5 and the drive belt 6.The continuously variable transmission 1 comprises two pulleys 4, 5 being arranged on separate pulley shafts 2, 3. A drive belt 6 is provided in a closed loop around the pulleys 4, 5 and serves for transmitting torque between the pulley shafts 2, 3. The pulleys 4 are each provided with two pulley sheaves, the drive belt is positioned and clamped between said two pulley sheaves, so that with the help of friction a force may be transmitted between the pulleys 4, 5 and the drive belt 6.

The drive belt 6 comprises two endless carriers 7 that are composed of a bundle of a number of mutually nested continuous bands or rings. Transverse segments 10 are arranged on the carriers 7 forming an essentially contiguous row along the entire circumference thereof. The transverse segments 10 are provided movable with respect to the endless carriers 7, at least in the circumference direction thereof. For the sake of simplicity, only a few of these transverse segments 10 are shown in figure 1.The drive belt 6 comprises two endless carriers 7 that are composed of a bundle or a number of mutually nested continuous bands or rings. Transverse segments 10 are arranged on the carriers 7 forming an essentially contiguous row along the entire circumference thereof. The transverse segments 10 are provided movable with respect to the endless carriers 7, at least in the circumference direction thereof. For the sake of simplicity, only a few of these transverse segments 10 are shown in figure 1.

Figures 2 and 3 show the transverse segment 10 of the known drive belt 6 in more detail. A front surface of the transverse segment 10 is indicated in general by the reference sign 11, whereas a rear surface of the transverse segment 10 is indicated in general by the reference sign 12.Figures 2 and 3 show the transverse segment 10 or the known drive belt 6 in more detail. A front surface of the transverse segment 10 is indicated in general by the reference sign 11, whereas a rear surface of the transverse segment 10 is indicated in general by the reference sign 12.

In the vertical direction, the transverse segment 10 comprises successively a base portion 13 of predominantly trapezoidal shape, a relatively narrow middle portion 14 and a top portion 15 of predominantly triangular shape. In the drive belt 6, the base portion 13 is located at the radially inner circumference side of the carrier 7, whereas the top portion 15 is located radially outward of the carrier 7. Furthermore, in the drive belt 6, at least a part of the front surface 11 of the transverse segment 10 abuts against at least a part of the rear surface 12 of a succeeding transverse segment 10, whereas at least a part of the rear surface 12 of the transverse segment 10 abuts against at least a part of the front surface 11 of a preceding transverse segment 10 .In the vertical direction, the transverse segment 10 successfully comprises a base portion 13 or predominantly trapezoidal shape, a relatively narrow middle portion 14 and a top portion 15 or predominantly triangular shape. In the drive belt 6, the base portion 13 is located on the radially inner circumference side of the carrier 7, whereas the top portion 15 is located radially outward of the carrier 7. Furthermore, in the drive belt 6, at least a part of the front surface 11 of the transverse segment 10 abuts against at least a part of the rear surface 12 of a succeeding transverse segment 10, whereas at least a part of the rear surface 12 of the transverse segment 10 abuts against at least a part of the front surface 11 or a preceding transverse segment 10.

Both to the left and the right of the middle portion 14 thereof, the transverse segment 10 defines an opening 23 that serves to receive a respective one of the endless carriers 7. These openings 23 are bound in radial inward direction by respective carrying surfaces 16 that support the endless carriers 7 in radial outward direction. Furthermore, the base portion 13 comprises two pulley sheave contact surfaces 17. When the transverse segment 10 moves over the pulley 4, 5, contact between the transverse segment 10 and contact surfaces of the pulley sheaves is established through said pulley sheave contact surfaces 17.Both to the left and the right to the middle portion 14 th, the transverse segment 10 defines an opening 23 that serves to receive a respective one of the endless carriers 7. These opening 23 are bound in radial inward direction by respective carrying surfaces 16 that support the endless carriers 7 in radial outward direction. Furthermore, the base portion 13 comprises two pulley sheave contact surfaces 17. When the transverse segment 10 moves over the pulley 4, 5, contact between the transverse segment 10 and contact surfaces of the pulley sheave is established through said pulley sheave contact surfaces 17.

At the front surface 11 of the transverse segment 10, a projection 21 is provided. In the shown example, the projection 21 is arranged in the top portion 15, and corresponds in position to a slightly larger hole provided in the rear surface 12. In figure 3, the hole is depicted by means of dashed lines and indicated by the reference sign 22. In the drive belt 6, the projection 21 of the transverse segment 10 is at least partially located inside the hole 22 of an adjacent transverse segment 10. The projection 21 and the corresponding hole 22 serve to prevent or at least limit mutual displacement of adjacent transverse segments 10 in a plane perpendicular to the circumference direction of the drive belt 6.At the front surface 11 or the transverse segment 10, a projection 21 is provided. In the shown example, the projection 21 is arranged in the top portion 15, and agreed in position to a slightly larger hole provided in the rear surface 12. In figure 3, the hole is depicted by means of dashed lines and indicated by the reference sign 22. In the drive belt 6, the projection 21 or the transverse segment 10 is at least partially located inside the hole 22 or an adjacent transverse segment 10. the projection 21 and the corresponding hole 22 serve to prevent or at least limit mutual displacement or adjacent transverse segments 10 in a plane perpendicular to the circumference direction of the drive belt 6.

Also, at the front surface 11 in the base portion 13 of the transverse segment 10, a tilting edge 18 is defined. The tilting edge 18 is represented by a convexly curved area of the front surface 11, which area separates two portions of the said front surface 11 in the height direction, which two portions are oriented at an angle relative to one other. The tilting edge 18 is located close to, but still at some distance below, i.e. radially inward of, the carrying surfaces 16. An important function of the tilting edge 18 is to provide a mutual pushing contact between the adjacent transverse segments 10, when said transverse segments 10 are in a slightly rotated or tilted position relative to one another at the pulleys 4, 5. In order to favourable realise a minimal contact stress in the said pushing contact between the said transverse segments 10 as well as for the stability of such contact, the tilting edge 18 preferably extends from the pulley sheave contact surface 17 to other, i.e. along the full local width of the transverse segments 10.Also, at the front surface 11 in the base portion 13 or the transverse segment 10, a tilting edge 18 is defined. The tilting edge 18 is represented by a convexly curved area of the front surface 11, which area separates two portions of the said front surface 11 in the height direction, which two portions are oriented at an angle relative to one other. The tilting edge 18 is located close to, but still at some distance below, ie radially inward of, the carrying surfaces 16. An important function of the tilting edge 18 is to provide a mutual pushing contact between the adjacent transverse segments 10, when said transverse segments 10 are in a slightly rotated or tilted position relative to one another at the pulleys 4, 5. In order to favourble realize a minimal contact stress in the said pushing contact between the said transverse segments 10 as well as for the stability of such contact, the tilting edge 18 preferably extends from the pulley sheave contact surface 17 to other, ie along the full local width of the transverse segments 10.

The transverse segment 10 is typically cut out of plate- or strip-shaped basic material 50 in a blanking process by means of a blanking device 60. In figures 4 and 5, the blanking device 60 and the basic material 50 are schematically illustrated in a crosssection. In the blanking device 60 a blanking punch 30, an ejector 40, a guide plate 70 and a die 80 are applied. The guide plate 70 and the die 80 serve both to clamp the basic material 50 between them and to contain the blanking punch 30 and the ejector 40 in respective guiding spaces 71, 81 thereof.The transverse segment 10 is typically cut-out or plate-shaped basic material 50 in a blanking process by means of a blanking device 60. In figures 4 and 5, the blanking device 60 and the basic material 50 are schematically illustrated in a crosssection. In the blanking device 60 a blanking punch 30, an ejector 40, a guide plate 70 and a that are 80 applied. The guide plate 70 and the die 80 serve both to clamp the basic material 50 between them and to contain the blanking punch 30 and the ejector 40 in respective guiding spaces 71, 81.

The part 51 of the basic material 50 that is located between the blanking punch 30 and the ejector 40 is destined to become the transverse segment 10. During blanking the bottom or working surface 31 of the blanking punch 30 and a top or working surface 41 of the ejector 40 are pressed against the basic material 50, at mutually opposite sides thereof, and the blanking punch 30 and the ejector 40 are moved in unison completely through the basic material 50 in the general direction from the blanking punch 30 to the ejector 40. As a result, the transverse segment 10 is cut out of the basic material 50 along the edges of the die 80, as illustrated in figure 5. Accordingly, the said working surfaces 31, 41 have an outline that substantially corresponds to the outer contour of the transverse segment 10.The part 51 of the basic material 50 that is located between the blanking punch 30 and the ejector 40 is destined to become the transverse segment 10. During blanking the bottom or working surface 31 of the blanking punch 30 and a top or working surface 41 or the ejector 40 are pressed against the basic material 50, mutually opposite sides and the blanking punch 30 and the ejector 40 are moved in unison completely through the basic material 50 in the general direction from the blanking punch 30 to the ejector 40. As a result, the transverse segment 10 is cut out of the basic material 50 along the edges of the die 80, as illustrated in figure 5. So, the said working surfaces 31, 41 have an outline that substantially conform to the outer contour of the transverse segment 10.

For facilitating the cutting the said edges of the die 80 are chamfered. However, in reality, the amount of chamfering is much less than what is shown in figure 5 for clarity. For example, typically, the depth of the chamfering amounts to approximately one tenth of the thickness of the basic material 50.For facilitating the said edges of the 80 are chamfered. However, in reality, the amount of chamfering is much less than what is shown in figure 5 for clarity. For example, typically, the depth of the spamming amounts to approximately one tenth of the thickness of the basic material 50.

During blanking the front surface 11 of the transverse segment 10, including the tilting edge 18, is shaped by the working surface 41 of the ejector 40 and the rear surface 12 of the transverse segment 10 is shaped by the working surface 31 of the blanking punch 30. This particular arrangement of the blanking punch 30 and of the ejector 40 may, however, be reversed in principle.During blanking the front surface 11 or the transverse segment 10, including the tilting edge 18, is shaped by the working surface 41 or the ejector 40 and the rear surface 12 or the transverse segment 10 is shaped by the working surface 31 or the blanking punch 30. This particular arrangement of the blanking punch 30 and of the ejector 40 may, however, be reversed in principle.

It is a well-known feature of the above-described blanking process that, at least in the aforementioned setup thereof, convexly curved transition surface 20 is formed between the front surface 11 and the cut circumference surface of the transverse segment 10. This feature of the blanking process is also known as rollover or Einzug in the art. In the transverse segment 10, the transition surface 20 is thus also present between its front surface 11 and the pulley sheave contact surfaces 17, as schematically indicated in figure 6. Figure 6 is a partial crosssection A-A of the base portion 13 of the transverse segment 10 depicted in figure 2, intersecting the tilting edge 18 thereof. From figure 6 it appears that the tilting edge 18 does not extend fully to the axial side of the transverse segment 10, but instead ends at some distance D away from the pulley sheave contact surface 17, due to the presence of the rollover 20a.It is a well-known feature of the blanking process described above, at least in the aforementioned setups, convexly curved transition surface 20 is formed between the front surface 11 and the cut circumference surface of the transverse segment 10. This feature of the blanking process is also known as rollover or Einzug in the art. In the transverse segment 10, the transition surface 20 is thus also present between its front surface 11 and the pulley sheave contact surfaces 17, as schematically indicated in figure 6. Figure 6 is a partial crosssection AA or the base portion 13 of the transverse segment 10 depicted in figure 2, intersecting the tilting edge 18 thereof. From figure 6 it appears that the tilting edge 18 does not extend fully to the axial side of the transverse segment 10, but instead ends at some distance D away from the pulley sheave contact surface 17, due to the presence of the rollover 20a.

According to the present disclosure, rollover can be favourably reduced locally and the tilting edge 18 can be made to extend further towards the pulley sheave contact surfaces 17 by introducing a pre-cut step prior to the blanking of the overall contour of the transverse segment 10. This novel manufacturing method is schematically illustrated in figure 7 both looking down on the basic material 50 and in a cross-section B-B thereof.According to the present disclosure, rollover can be favourably reduced locally and the tilting edge 18 can be made to extend further towards the pulley sheave contact surfaces 17 by introducing a pre-cut step prior to the blanking of the overall contour of the transverse segment 10 This novel manufacturing method is schematically illustrated in Figure 7 both looking down on the basic material 50 and in a cross-section BB.

According to the present disclosure, the transverse segment 10 is cut from the basic material 50 in at least two steps I, II. In a first step I holes 91 are punched in the basic material 50 by means of piercing punches 90. These holes 91 are located on either side of the transverse segment 10 to be formed later (indicated in figure 7 by the dashed line) in line with the tilting edge 18 thereof. The piercing punches 90 move thereto move through the basic material 50 from a first one main side 53 thereof, preferably corresponding to the back surface 12 of the transverse segment 10 to be formed, to its opposite main side 52. After the said holes 91 are pre-cut, i.e. in a second step II, the transverse segment 10 is completely separated from the basic material 50 by cutting the remaining contour thereof by means of the blanking punch 30.According to the present disclosure, the transverse segment 10 is cut from the basic material 50 in at least two steps I, II. In a first step I holes 91 are punched in the basic material 50 by means of piercing punches 90. These holes 91 are located on either side of the transverse segment 10 to be formed later (indicated in figure 7 by the dashed line) in line with the tilting edge 18 thereof. The piercing punches 90 move thereto move through the basic material 50 from a first one main side 53 Nam, preferably corresponding to the back surface 12 or the transverse segment 10 to be formed, to its opposite main side 52. After the said holes 91 are pre-cut, ie in a second step II, the transverse segment 10 is completely separated from the basic material 50 by cutting the remaining contour by means of the blanking punch 30.

In figure 8 the shape of the transverse segment 10 resulting from the above novel manufacturing method is schematically illustrated in a partial cross-section A-A of the base portion 13 of the transverse segment 10 depicted in figure 2. From figure 8 it appears that the rollover 20b between the pulley sheave contact surface 17 and, in particular, the back surface 12 created in the said first, pre-cut step I is favourably small. As a result the tilting edge 18 extends almost to the axial side of the transverse segment 10, at least extends further in such direction than what was realised with the conventional manufacturing method (figure 6).In figure 8 the shape of the transverse segment 10 resulting from the above novel manufacturing method is schematically illustrated in a partial cross-section AA or the base portion 13 or the transverse segment 10 depicted in figure 2. From figure 8 it appears that the rollover 20b between the pulley sheave contact surface 17 and, in particular, the back surface 12 created in the said first, pre-cut step I is favourably small. As a result the tilting edge 18 extends almost to the axial side of the transverse segment 10, at least extends further in such direction than what was realized with the conventional manufacturing method (Figure 6).

In figure 9 the said first step I of the above novel manufacturing method is illustrated in more detail, showing a possible contour and relative placement of the piercing punch 90. The piercing punch 90 is arranged to slightly overlap 0 with the pulley sheave contact surface 17 of the transverse segment 10 to be formed later in the second step II, i.e. relative to an intended position thereof. This feature allows for process variations such as an inaccuracy in the positioning of the holes 91 formed in the basic material 50 in the first step I relative to the positing of the blanking punch 30 in the second step II. According to the present disclosure, such overlap 0 preferably amounts to between 0.025 mm and 0.1 mm, in particular exceeds a depth of the corrugation profile of the pulley sheave contact surfaces 17 by at least a factor of 2. In the end-product transverse segment 10, such overlap O results in an interruption of each pulley sheave contact surface 17 in line with the tilting edge 18 and in the form of a recess in the base portion (13) relative to a plane defined by the respective pulley sheave contact surface 17.In figure 9 the said first step I or the above novel manufacturing method is illustrated in more detail, showing a possible contour and relative placement of the piercing punch 90. The piercing punch 90 is arranged to slightly overlap 0 with the pulley sheave contact surface 17 or the transverse segment 10 to be formed later in the second step II, ie relative to an intended position. This feature allows for process variations such as an inaccuracy in the positioning of the holes 91 formed in the basic material 50 in the first step I relative to the positing of the blanking punch 30 in the second step II. According to the present disclosure, such overlap 0 preferably amounts to between 0.025 mm and 0.1 mm, in particular except a depth of the corrugation profile of the pulley sheave contact surfaces 17 by at least a factor of 2. In the end-product transverse segment 10, such overlap O results in an interruption of each pulley sheave contact surface 17 in line with the tilting edge 18 and in the form of a recess in the base portion (13) relative to a plane defined by the respective pulley sheave contact surface 17 .

Furthermore, as also illustrated in figure 9, the section of the piercing punch 90 that overlaps with the transverse segment 10 to be formed later is preferably convexly curved. The radius or radii of curvature R of this section of the piercing punch 90 are preferably small in order to maximise the extend of the tilting edge 18 as desired, but should at the same time be large enough for the piercing punch 90, i.e. the punched hole 91, to cover a substantial part of the height of the tiling edge 18. According to the present disclosure, such radius of radii preferably amounts to between 0.1 mm and 0.5 mm.Furthermore, as also illustrated in figure 9, the section of the piercing punch 90 that overlaps with the transverse segment 10 to be formed later is preferably convexly curved. The radius or radii or curvature R or this section of the piercing punch 90 are preferably small in order to maximize the extend of the tilting edge 18 as desired, but should be large enough for the piercing punch 90, ie the punched hole 91, to cover a substantial part of the height of the tiling edge 18. According to the present disclosure, such radius or preferably amounts to between 0.1 mm and 0.5 mm.

The present disclosure, in addition to the entirety of the preceding description and all details of the accompanying figures, also concerns and includes all of the features of the appended set of claims. Bracketed references in the claims do not limit the scope thereof, but are merely provided as non-binding examples of the respective features. The claimed features can be applied separately in a given product or a given process, as the case may be, but can also be applied simultaneously therein in any combination of two or more of such features therein.The present disclosure, in addition to the whole of the preceding description and all details of the accompanying figures, also concerns and includes all of the features of the appended set of claims. Bracketed references in the claims do not limit the scope, but are merely provided as non-binding examples or the respective features. The claimed features can be applied separately in a given product or process, as the case may be, but can also be applied simultaneously therein in any combination of two or more or such features therein.

The invention(s) represented by the present disclosure is (are) not limited to the embodiments and/or the examples that are explicitly mentioned herein, but also encompasses amendments, modifications and practical applications thereof, in particular those that lie within reach of the person skilled in the relevant art.The invention (s) represented by the present disclosure is (are) not limited to the following and / or the examples that are explicitly mentioned, but also encompasses amendments, modifications and practical applications, in particular those that are within reach of the person skilled in the relevant art.

Claims (7)

CONCLUSIES basismateriaal dwarssegment basismateriaalCONCLUSIONS basic material cross segment basic material 1. Werkwijze voor het vervaardigen van een dwarssegment (10), in het bijzonder bestemd voor toepassing in een drijfriem (6) voor een continu variabele overbrenging (1), welk dwarssegment (10) is voorzien van een kantellijn (18) in de vorm van een convex gekromd deel van een hoofdlichaamsvlak (11) daarvan, welke kantellijn (18) zich in breedte richting in het dwarssegment (10) uitstrekt tot aan een omtreksvlak (16; 17) daarvan en een overgangsrand vormt tussen een bovenste deel (14; 15) van het dwarssegment (10) met een in hoofdzaak constante dikte en een taps toelopend onderste deel (13) daarvan, in welke werkwijze het dwarssegment (10) uit een (50) wordt gesneden, met het kenmerk, dat het (10) in tenminste twee processtappen uit het (50) wordt gesneden, dat in een eerste processtap tenminste één gat (91) in het basismateriaal (50) wordt geponst met behulp van een snijpons (90), een deel van de omtrek van welk gat (91) een deel van het omtreksvlak (16; 17) van het dwarselement (10) betreft in het verlengde van de kantellijn (18) daarvan en dat in een tweede processtap een deel van de of de gehele contour van het dwarssegment (10) uit het basismateriaal (50) wordt gestanst met behulp van een snijstempel (30).Method for manufacturing a transverse segment (10), in particular intended for use in a drive belt (6) for a continuously variable transmission (1), which transverse segment (10) is provided with a tilt line (18) in the form of a convex curved portion of a main body surface (11) thereof, which tilt line (18) extends in width direction in the transverse segment (10) up to a peripheral surface (16; 17) thereof and forms a transition edge between an upper portion (14; 15) of the cross-section (10) with a substantially constant thickness and a tapered lower part (13) thereof, in which method the cross-section (10) is cut out of a (50), characterized in that it (10) is cut out of the (50) in at least two process steps, that in a first process step at least one hole (91) is punched in the base material (50) with the aid of a cutting punch (90), a part of the circumference of which hole (91) ) a part of the peripheral surface (16; 17) of the transverse element (10) b is in line with the tilt line (18) thereof and that in a second process step part or all of the contour of the transverse segment (10) is punched out of the base material (50) with the aid of a cutting stamp (30). 2. De werkwijze het vervaardigen van een dwarssegment (10) volgens de conclusie 1, met het kenmerk, dat in de eerste processtap twee gaten (91) in het basismateriaal (50) worden geponst met behulp van snijponsen (90), een deel van de omtrek van welke gaten (91) delen van het omtreksvlak (16; 17) van het dwarselement (10) betreffen aan weerszijden en in het verlengde van de kantellijn (18) daarvan.The method of manufacturing a transverse segment (10) according to claim 1, characterized in that in the first process step two holes (91) are punched in the base material (50) with the aid of cutting punches (90), a part of the circumference of which holes (91) relate to parts of the peripheral surface (16; 17) of the transverse element (10) on both sides and in line with the tilting line (18) thereof. 3. De werkwijze het vervaardigen van een dwarssegment (10)3. The method of manufacturing a cross-section (10) volgens according to de the conclusie conclusion 1 of 2, 1 or 2, met with waarin in which de the snijpons cutting punch (90) of (90) or de the processtap process step ten opzichte van, relative to, c.q c.q
snijponsen (90) in de eerste c.q. door het basismateriaal (50) wordt, c.q. worden bewogen gelijk is aan een richting waarin de snijstempel (30) in de tweede processtap ten opzichte van, c.q. door het basismateriaal (50) wordt bewogen.cutting punches (90) in the first or through the base material (50) is moved or is equal to a direction in which the cutting punch (30) in the second process step is moved relative to or through the base material (50). 4. De werkwijze het vervaardigen van een dwarssegment (10) volgens de conclusie 1 of 2, met het kenmerk, dat de snijpons (90) of de snijponsen (90) in de eerste processtap vanaf een tegen ver het hoofdlichaamsvlak (11) van het dwarselement (10) met de kantellijn (18) gelegen achterzijde (53) van het basismateriaal daarvan door het basismateriaal (50) wordt, c.q. worden bewogen.The method of manufacturing a transverse segment (10) according to claim 1 or 2, characterized in that the cutting punch (90) or the cutting punches (90) in the first process step from a distance to the main body surface (11) of the transverse element (10) with the rear side (53) of the base material located along the tilting line (18) is moved or moved by the base material (50). 5. Een dwarssegment (10) voor of in een drijfriem (6) voor een continu variabele overbrenging (1) vervaardigd met behulp van de werkwijze volgens een der conclusies 1-4, met het kenmerk, dat het dwarssegment (10) aan weerszijden een contactvlak (17) bestemd voor wrijvingscontact met een poelieschijf van de overbrenging (1) omvat, welke contactvlakken (17) in het verlengde van de kantellijn (18) worden onderbroken door een respectievelijke uitsparing die zich tussen 0.025 mm en 0.1 mm gezien vanuit een respectievelijk contactvlak (17) in het dwarssegment (10) uitstrekt.A transverse segment (10) in front of or in a drive belt (6) for a continuously variable transmission (1) manufactured by the method according to any one of claims 1-4, characterized in that the transverse segment (10) on either side contact surface (17) intended for frictional contact with a pulley sheave of the transmission (1), which contact surfaces (17) are interrupted in line with the tilting line (18) by a respective recess located between 0.025 mm and 0.1 mm seen from a respective contact surface (17) extends in the transverse segment (10). 6. Een dwarssegment (10) voor of in een drijfriem (6) voor een continu variabele overbrenging (1) vervaardigd met behulp van de werkwijze volgens een der conclusies 1-4, met het kenmerk, dat het dwarssegment (10) aan weerszijde daarvan een contactvlak (17) omvat dat bestemd is voor wrijvingscontact met een poelieschijf van de overbrenging (1) en dat is voorzien van een golvend profiel met een zeker golfhoogte, welke contactvlakken (17) in het verlengde van de kantellijn (18) worden onderbroken door een respectievelijke uitsparing die zich gezien vanuit een respectievelijk contactvlak (17) in het dwarssegment (10) uitstrekt over een afstand van tenminste 2 keer de profieldiepte oftewel de piek-tot-dal amplitude van het golvend profiel.A transverse segment (10) in front of or in a drive belt (6) for a continuously variable transmission (1) manufactured by the method according to one of claims 1-4, characterized in that the transverse segment (10) on either side thereof comprises a contact surface (17) intended for frictional contact with a pulley sheave of the transmission (1) and which is provided with a wavy profile with a certain wave height, which contact surfaces (17) are interrupted by an extension of the tilting line (18) a respective recess which, viewed from a respective contact surface (17) in the transverse segment (10), extends over a distance of at least 2 times the profile depth, i.e. the peak-to-valley amplitude of the wavy profile. 7. Een dwarssegment (10) voor of in een drijfriem (6) voor een continu variabele overbrenging (1) vervaardigd met behulp van de werkwijze volgens een der conclusies 1-4, met het kenmerk, dat het dwarssegment (10) aan weerszijde daarvan een contactvlak (17) omvat dat bestemd is voor wrijvingscontact met een poelieschijf van de overbrenging (1), welke contactvlakken (17) in het verlengde van de kantellijn (18) worden onderbroken door een respectievelijke concaaf gevormde uitsparing met een kromtestraal tussen 0.1 mm en 0.5 mm.A transverse segment (10) for or in a drive belt (6) for a continuously variable transmission (1) manufactured by the method according to any one of claims 1-4, characterized in that the transverse segment (10) on either side thereof comprises a contact surface (17) intended for frictional contact with a pulley sheave of the transmission (1), which contact surfaces (17) are interrupted in line with the tilting line (18) by a respective concavely shaped recess with a radius of curvature between 0.1 mm and 0.5 mm. 1/31/3
NL1042202A 2016-12-30 2016-12-30 Method for manufacturing a transverse segment for a drive belt for a continuously variable transmission and a transverse segment thus manufactured NL1042202B1 (en)

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JP2017249568A JP2018111133A (en) 2016-12-30 2017-12-26 Method for manufacturing transverse member for drive belt used for continuously variable transmission, and transverse member manufactured thereby
CN201711476858.5A CN108266494B (en) 2016-12-30 2017-12-29 Method for producing a transverse segment of a drive belt for a continuously variable transmission and transverse segment produced

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