WO2006068473A1 - Element transversal comportant une region definie encaissant le retrait - Google Patents

Element transversal comportant une region definie encaissant le retrait Download PDF

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Publication number
WO2006068473A1
WO2006068473A1 PCT/NL2005/000879 NL2005000879W WO2006068473A1 WO 2006068473 A1 WO2006068473 A1 WO 2006068473A1 NL 2005000879 W NL2005000879 W NL 2005000879W WO 2006068473 A1 WO2006068473 A1 WO 2006068473A1
Authority
WO
WIPO (PCT)
Prior art keywords
transverse element
push belt
contact region
transverse
contact
Prior art date
Application number
PCT/NL2005/000879
Other languages
English (en)
Inventor
Robert Arnoldus Andreas Mutsaers
Jasper Feijtel
Lucas Hendricus Robertus Maria Prinsen
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to JP2007548111A priority Critical patent/JP4837674B2/ja
Publication of WO2006068473A1 publication Critical patent/WO2006068473A1/fr

Links

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

Definitions

  • Transverse element having a defined region for receiving retraction
  • the invention relates to a transverse element which is destined to be part of a push belt for a continuously variable transmission, wherein the push belt is shaped like a closed loop, and wherein the continuously variable transmission has two pulleys for suspending the push belt ;
  • which transverse element is three-dimensionally delimited by two main body surfaces and a circumferential surface extending between the main body surfaces , and which transverse element comprises a basic portion and a top portion, wherein the basic portion is destined to be located at an inner circumference of a push belt when the transverse element is applied in such a push belt , and wherein the top portion is destined to be located at an outer circumference of a push belt when the transverse element is applied in such a push belt ; and wherein at least one of the main body surfaces is provided with a contact region which is located at the top portion, which is elevated with respect to a surrounding portion of the main body surface, and which serves for establishing contact to an adj acent transverse element when the transverse element is applied in
  • a push belt for a continuously variable transmission is generally known .
  • a push belt comprises two endless , ribbon-like carriers shaped like a closed loop for carrying a relatively large number of transverse elements .
  • the transverse elements are movably arranged along the entire circumference of the carriers , wherein, during operation, they are able to transmit forces which are related to a movement of the push belt .
  • a longitudinal direction of the transverse element corresponds to a circumferential direction of the push belt .
  • a vertical transverse direction of the transverse element corresponds to a radial direction of the push belt .
  • a horizontal transverse direction of the transverse element corresponds to a direction perpendicular to both the longitudinal direction and the vertical transverse direction .
  • the indication of any transverse element as subsequent transverse element or previous transverse element with respect to an adj acent transverse element is related to a direction of movement of the push belt .
  • the transverse element In the horizontal transverse direction, at opposite sides , the transverse element is provided with recesses for receiving the carriers .
  • the transverse element comprises carrying surfaces .
  • the transverse element In the horizontal transverse direction, at opposite sides , for the purpose of contact between the transverse element and pulley sheaves of a pulley of a continuously variable transmission, the transverse element is provided with pulley sheave contacting surfaces , which are divergent in the direction of the carrying surfaces .
  • the terms "top “ and "bottom” which are hereinafter applied, are related to the direction of divergence ; this is defined as being from bottom to top .
  • the transverse element comprises successively a basic portion, a neck portion and a top portion, wherein, in the horizontal transverse direction, the dimensions of the neck portion are relatively small .
  • the basic portion comprises the carrying surfaces and the pulley sheave contacting surfaces .
  • the basic portion is located at the side of the inner circumference of the push belt
  • the top portion is located at the side of the outer circumference of the push belt .
  • the transverse element has two main body surfaces , namely a front surface and a back surface, which are extending substantially parallel with respect to each other, substantially perpendicular to the longitudinal direction . At least a portion of the front surface of the transverse element is destined to contact at least a portion of the back surface of a subsequent transverse element in the push belt , whereas at least a portion of the back surface of the transverse element is destined to contact at least a portion of the front surface of a previous transverse element in the push belt .
  • a circumferential surface, of which the carrying surfaces and the pulley sheave contacting surfaces are part is extending between the two main body surfaces .
  • a proj ection is arranged, whereas in the back surface of the transverse element , a hole is arranged.
  • the positions of the proj ection and the hole are corresponding to each other, wherein the proj ection and the hole are usually positioned at the top portion .
  • the projection of any transverse element is at least partially located in the hole of a subsequent transverse element , so that a mutual displacement of adj acent transverse elements in a plane perpendicular to the circumferential direction of the push belt is prevented .
  • a transmission of power between the two pulleys involves pushing forces in the push belt .
  • Each contact region is situated at a somewhat higher level than a surrounding portion of the relevant main body surface, in other words , at the location of each contact region, the transverse element is thickened a little bit .
  • a transverse element having three contact regions wherein two contact regions are located at the basic portion of the transverse element, and wherein one contact region is located at the top portion of the transverse element . More in particular, each of the two contact regions at the basic portion is shaped as a corner region which is partially delimited by a portion of a carrying surface and a portion of a pulley sheave contacting surface connected thereto . In any case , the contact region at the top portion extends in a region which is located above the proj ection, and is partially delimited by an upper portion of the circumferential surface . As a consequence of the application of three contact regions , a so-called three-point bearing of the transverse elements is obtained, which contributes to the stability of a push belt in which the transverse elements are applied.
  • the transverse elements are manufactured out of sheet-shaped basic material .
  • a cutting member and a supporting member are applied, wherein the cutting member is destined to cut the transverse element out of the basic material under the influence of a cutting force, and wherein the supporting member is destined to support the transverse element by a supporting force during the blanking process , and also to form the front surface of the transverse element by means of a process of cold remodeling .
  • the circumference of both the supporting surface and the cutting surface is substantially equal to the circumference of the transverse element .
  • the cutting member penetrates the basic material under the influence of pressure, wherein a mutual movement of the transverse element to be blanked and the basic material is allowed.
  • the transverse element to be blanked is clamped between the cutting member and the supporting member .
  • a mould is applied, which is provided with a receiving space for receiving the transverse element to be blanked, the supporting member and an end of the cutting member .
  • the inner circumference of the receiving space substantially corresponds to the circumference of the cutting member, the supporting member, as well as the transverse element to be blanked, so that the receiving space is capable of receiving the cutting member, the supporting member and the transverse element to be blanked, with an exceedingly small play .
  • the retraction which occurs during the process of blanking the transverse element constitutes a problem. Due to the fact that the contact region is adj acent to an upper portion of the circumferential surface , which ⁇
  • the area of the contact region may diminish to a large extent as a result of retraction of material at the position of a transition between the contact region and the circumferential surface .
  • a decrease of area of the contact region may lead to a decrease of the stability and the functionality of a push belt when the transverse element is applied in such a push belt .
  • the decrease of the area of the contact region may have different consequences .
  • a smaller contact region is completely worn away at an earlier stage than a larger contact region, or diminished to such an extent that the contact region can no longer be functional . This may even be the case at such an early stage that this takes place during an intended lifespan of the push belt .
  • a deviation of the size of the contact region may result in the compression performance of the contact region being different than might be expected on the basis of the desired size of the contact region .
  • a deviation of the size of the contact region may result in the dynamic spring stiffness of the push belt being different than might be expected on the basis of the desired size of the contact region. In view of the fact that certain requirements are made on this spring stiffness , it is important that the area of the contact region is accurately defined .
  • An important obj ective of the invention is increasing the stability and the functionality of the push belt by providing a transverse element having contact regions for establishing contact to an adj acent transverse element in the push belt , which contact regions are more accurately defined .
  • This obj ective is achieved by means of a transverse element in which the top portion is provided with a recess which is arranged in the main body surface at which the contact region is located, and which is connected to both a part of the contact region and a part of the circumferential surface . Due to the presence of the recess , it is achieved that a part of the contact region which, according to the original design of the transverse element , would directly connect to a part of the circumferential surface, does not do so now .
  • this part of the contact region is adj acent to the recess .
  • An advantageous consequence is that the retraction which takes place at the circumference of the transverse element during the blanking process does not take place in the contact region, so that this region can be formed with accurately defined dimensions . This will be beneficial to the stability and the functionality of a push belt in which the transverse element is applied.
  • the transverse element according to the present invention When the transverse element according to the present invention is being blanked, retraction of material takes place at the position of the recess in the top portion . Not only the retraction not taking place on the contact region is being advantageous , but also the retraction being less , due to the fact that the transverse element is less thick at the position of the recess .
  • the transverse element is manufactured from basic material which is pre-processed by applying recesses at positions where an upper side of the top portion of the transverse elements is blanked out of the basic material .
  • the basic material comprises a strip which is provided with a groove along its entire length, wherein the groove extends along an edge or in the centre, respectively, and out of which the transverse elements are blanked while being positioned adjacent to one another in one row or two rows , respectively.
  • figure 1 diagrammatically shows a side view of a continuously variable transmission having a push belt
  • figure 2 shows a front view of a transverse element for a push belt for a continuously variable transmission
  • figure 3 shows a side view of the transverse element as shown in figure 2
  • figure 4 shows a diagrammatical longitudinal section of a blanking area of a blanking device, as well as of basic material placed in there
  • figure 5 illustrates retraction in a blanked product which has been obtained by applying the blanking device as shown in figure 4
  • figure 6 diagrammatically shows a cross-section of a top portion of a transverse element according to the state of the art
  • figure 7 diagrammatically shows a cross-section of a top portion of a transverse element having a recess according to the invention
  • figure 8 diagrammaticalIy shows a front view of the top portion of the transverse element according to the invention as shown in figure 7 ; and figure 9 shows basic material for manufacturing transverse elements according to the invention .
  • Figure 1 diagrammatically 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.
  • the continuously variable transmission 1 comprises two pulleys 4 , 5 being arranged on separate pulley shafts 2 , 3.
  • An endless push belt 6 being shaped like a closed loop is arranged around the pulleys 4 , 5 , and serves for transmitting torque between the pulley shafts 2 , 3.
  • Each of the pulleys 4 , 5 comprises two pulley sheaves , wherein the push belt 6 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 push belt 6.
  • the push belt 6 comprises at least one endless carrier 7 , which is usually composed of a number of rings .
  • transverse elements 10 are arranged, wherein the transverse elements 10 are mutually adjacent to each other and are moveable with respect to the carrier 7 in the circumferential direction .
  • the transverse elements 10 are shown in figure 1.
  • FIGS 2 and 3 show a transverse element 10.
  • a front surface of the transverse element 10 is indicated in general by the reference sign 11
  • a back surface of the transverse element 10 is indicated in general by the reference sign 12.
  • both the front surface 11 and the back surface 12 are also indicated as main body surface 11 , 12.
  • a circumferential surface 19 extends between the main body surfaces 11 , 12.
  • the transverse element 10 comprises successively a basic portion 13 , a relatively narrow neck portion 14 , and a top portion 15 shaped like the tip of an arrow.
  • the basic portion 13 is located at the side of the inner circumference of the push belt 6
  • the top portion 15 is located at the side of the outer circumference of the push belt 6.
  • at least a portion of the front surface 11 of the transverse element 10 contacts at least a portion of the back surface 12 of a subsequent transverse element 10
  • at least a portion of the back surface 12 of the transverse element 10 contacts at least a portion of the front surface 11 of a preceding transverse element 10.
  • the basic portion 13 of the transverse element 10 as shown in figure 2 comprises two carrying surfaces 16 which serve for supporting two carriers 7. Furthermore, the basic portion 13 comprises two pulley sheave contacting surfaces 17.
  • the transverse element 10 moves over the pulley 4 , 5 , contact between the transverse element 10 and contact surfaces of the pulley sheaves is realized through said pulley sheave contacting surfaces 17.
  • a bottom surface 18 extends between the pulley sheave contacting surfaces 17.
  • the carrying surfaces 16 , the pulley sheave contacting surfaces 17 , as well as the bottom surface 18 are part of the circumferential surface 19.
  • a projection 21 is arranged at the front surface 11 of the transverse element 10 .
  • the projection 21 is located at the top portion 15 , and corresponds to a hole in the back surface 12.
  • the hole is depicted by means of dotted lines and indicated by the reference sign 22.
  • the proj ection 21 of the transverse element 10 is at least partially located in the hole 22 of a subsequent transverse element 10.
  • the projection 21 and the corresponding hole 22 serve to prevent mutual displacement of adj acent transverse elements 10 in a plane perpendicular to the circumferential direction of the push belt 6.
  • the top portion 15 comprises two retaining surfaces 23 which are located opposite to the carrying surfaces 16.
  • the top portion 15 comprises two top surfaces 24 which are connected to each other .
  • each of the top surfaces 24 is connected to a retaining surface 23 of the top portion 15. Both the retaining surfaces 23 and the top surfaces 24 are part of the circumferential surface 19.
  • three contact regions 25 , 26a, 26b are present , which are depicted as hatched areas in figure 2.
  • the contact regions 25 , 26a, 26b are formed as small elevations with respect to the front surface 11, and serve for establishing contact of the transverse element 10 to an adjacent transverse element 10 in a push belt 6.
  • a first contact region 25 is located at the top portion 15 of the transverse element , and is situated above the proj ection 21.
  • Two other contact regions 2Ga, 26b are located at the basic portion 13 of the transverse element 10 , wherein both contact regions 26a, 26b are partially delimited by a portion of a carrying surface 16 and a portion of a pulley sheave contacting surface 17 connected thereto .
  • FIG 4 a blanking area of a blanking device 60 and sheet- shaped basic material 50 being placed in there are diagrammatically depicted .
  • the blanking device 60 comprises a cutting member 30 which is destined to cut the transverse element 10 out of the basic material 50.
  • the cutting member 30 is accommodated in a guiding space 36 in a guiding plate 35 , an important function of which is guiding the cutting member 30 during a blanking movement .
  • a supporting member 40 is in line with the cutting member 30 , which is destined to support the transverse element 10 during the blanking process .
  • the circumference of both the cutting member 30 and the supporting member 40 substantially corresponds to the circumference of the transverse element 10 to be blanked.
  • the supporting member 40 is accommodated in a receiving space 46 in a mould 45 , an important function of which is guiding both the supporting member 40 and the transverse element 10 during a blanking movement .
  • the inner circumference of the receiving space 46 substantially corresponds to the circumference of the cutting member 30 , the supporting member
  • the basic material 50 is located between the cutting member 30 and the guiding plate 35 on the one hand, and the supporting member 40 and the mould 45 on the other hand.
  • a portion of the basic material 50 which is located between the cutting member 30 and the supporting member 40 is destined to form the transverse element 10 , and will hereinafter be referred to as blanking portion 51.
  • Another portion of the basic material 50 namely the portion that is located between the guiding plate 35 and the mould 45 , will hereinafter be referred to as rest portion 52.
  • the mould 45 comprises a mould surface 47 , an important function of which is supporting the rest portion 52 of the basic material 50.
  • An inner surface of the receiving space 46 of the mould 45 is connected to the mould surface 47 , through a circumferential edge 48.
  • the circumferential edge 48 is beveled, wherein a bevel surface 49 is extending between the mould surface 47 and the inner surface of the receiving space 46.
  • FIG 5 a longitudinal section of the blanking area of the blanking device 60 is diagrammatically depicted, wherein the various components of the blanking device 60 are depicted in a mutual position which is representative of a phase of the blanking process in which the cutting member 30 has already been pressed so far in the mould 45 that the blanking portion 51 is completely cut loose from the rest portion 52 and is present in the mould 45 , while being clamped between the cutting member 30 and the supporting member 40.
  • retraction of material of the blanking portion 51 has taken place, at the position of a circumference of the blanking portion 51 , at a side of the blanking portion 51 which is facing the supporting member 40.
  • the retraction is depicted in a diagrammatical and exaggerated fashion, in the form of round edges at the circumference of the blanking portion 51.
  • FIG 6 a cross-section of the top portion 15 of a transverse element according to the state of the art is diagrammatically depicted, wherein the contact region 25 which is located at the top portion 15 , the proj ection 21 and the hole 22 are sectioned .
  • a theoretically desired shape of a transition between the contact region 25 and the adj acent top surface 24 is depicted by means of a dashed line .
  • it is theoretically desired that the contact region 25 and the adj acent top surface 24 are extending substantially at right angles with respect to each other, and are connected to each other at an angle of substantially 90 ° .
  • figure 7 diagrammatically shows a cross-section of the top portion 15 of a transverse element , wherein the contact region 25 which is located at the top portion 15 , the proj ection 21 and the hole 22 are sectioned.
  • the top portion 15 of a transverse element 10 according to the invention is depicted, wherein, compared to the theoretically desired shape of the transition between the contact region 25 and the adj acent top surface 24 as shown in figure 6, an upper portion is removed.
  • a theoretically desired shape of the recess 27 which is obtained in this way and the top surface 24 connected thereto is depicted by means of a dashed line in figure 7.
  • retraction of material takes place .
  • Figure 7 shows the obtained shape of the contact region 25 , the recess 27 and a transition between the recess 27 and the adjacent top surface 24 , wherein it is clear that the shape of the contact region 25 has not been influenced by retraction .
  • the effect of the retraction on a functional area of the contact region 25 is considerably smaller when a recess 27 is present between the contact region 25 and the top surface 24 than when this is not the case .
  • the contact region 25 may be somewhat reduced, but , as a result of the fact that retraction does not appear at the contact region 25 , a larger functional area is eventually maintained, and the contact region 25 is practically similar to a theoretically defined contact region 25. All of this has an advantageous influence on the stability and the functionality of a push belt 6 in which the transverse elements 10 according to the invention are applied .
  • a front side of the top portion 15 of the transverse element 10 according to the invention is depicted, wherein the contact region 25 is depicted as a hatched area .
  • this figure it is shown that by realizing the recess 27 , a substantially flat upper side of the contact region 25 is obtained. Because this shape of the contact region 25 and the recess 27 are realizable in practice, in a relatively easy fashion, this shape is preferred, which does not alter the fact that other shapes are also possible within the scope of the invention.
  • a strip of basic material 50 is depicted, wherein the transverse elements 10 to be blanked (also indicated as blanking portions 51) are drawn in .
  • a central groove 53 is arranged in the material , which serves for forming the recess 27 in the top portion 15 of the transverse elements 10.
  • the groove 53 is depicted by means of two parallel dotted lines .
  • the basic material 50 is thinner than directly outside the groove 53.
  • two rows of transverse elements 10 are formed out of the strip of basic material 50 , wherein the transverse elements 10 are located such that their top portions 15 are facing each other .
  • a recess 27 is obtained.
  • a single row of transverse elements 10 is blanked out of a strip of basic material 50. In such a case, the groove 53 does not have a central position, but is arranged at an edge of the strip .
  • the basic material 50 is provided with recesses at defined positions , which are not connected to each other .
  • the defined positions correspond to the positions where an upper portion of the top portion 15 of the transverse elements 10 is formed.
  • a transverse element 10 has been described, which is destined to be part of a push belt 6 for a continuously variable transmission 1.
  • the transverse element 10 is provided with three contact regions 25 ' , 2Sa, 26b for establishing contact to an adjacent transverse element 10 in the push belt 6.
  • One of these contact regions 25 , 26a, 26b is located at a top portion 15 of the transverse element 10.
  • An upper part of this contact region 25 is indirectly connected to a circumference of the transverse element 10 , through a recess 27 defining a region in which retraction of material which takes place during the manufacturing process of the transverse element 10 is being received .

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmissions By Endless Flexible Members (AREA)
  • Punching Or Piercing (AREA)

Abstract

L’invention concerne un élément transversal (10) destiné à faire partie d’une courroie de poussée d’une transmission à variation continue et doté, au niveau d’une surface avant (11), de trois régions de contact servant à établir un contact avec un élément transversal adjacent dans la courroie de poussée. L’une des ces régions de contact est située au niveau d’une portion de dessus (15) de l’élément transversal (10). Une partie supérieure de cette région de contact (25) est reliée indirectement à la circonférence de l’élément transversal (10), par l’intermédiaire d’un renfoncement (27) définissant une région encaissant le retrait d’une matière au cours du processus de fabrication de l’élément transversal (10), ce qui permet d’empêcher la réduction des dimensions d’un secteur fonctionnel de la région de contact (25) du fait du retrait. Les dimensions du secteur fonctionnel de la région de contact (25) correspondent donc bien aux dimensions prédéfinies. L’utilisation de l’élément transversal (10) dans une courroie de poussée améliore la stabilité et la fonctionnalité de la courroie de poussée.
PCT/NL2005/000879 2004-12-24 2005-12-20 Element transversal comportant une region definie encaissant le retrait WO2006068473A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007548111A JP4837674B2 (ja) 2004-12-24 2005-12-20 リトラクションを受ける所定領域を備える横断要素

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1027876 2004-12-24
NL1027876A NL1027876C2 (nl) 2004-12-24 2004-12-24 Dwarselement met een gedefinieerd gebied voor het opvangen van intrekking.

Publications (1)

Publication Number Publication Date
WO2006068473A1 true WO2006068473A1 (fr) 2006-06-29

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PCT/NL2005/000879 WO2006068473A1 (fr) 2004-12-24 2005-12-20 Element transversal comportant une region definie encaissant le retrait

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NL (1) NL1027876C2 (fr)
WO (1) WO2006068473A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010034320A2 (fr) * 2007-12-24 2010-04-01 Robert Bosch Gmbh Courroie d’entraînement

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0278545A1 (fr) * 1987-01-23 1988-08-17 Van Doorne's Transmissie B.V. Courroie de transmission, élément transversal pour une courroie de transmission, procédé et dispositif de fabrication
WO2004036083A2 (fr) 2002-10-16 2004-04-29 Van Doorne's Transmissie B.V. Courroie d'entrainement a elements transversaux et dispositif d'estampage pour produire des elements transversaux

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62140245A (ja) * 1985-12-13 1987-06-23 Canon Inc 情報記録担体

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0278545A1 (fr) * 1987-01-23 1988-08-17 Van Doorne's Transmissie B.V. Courroie de transmission, élément transversal pour une courroie de transmission, procédé et dispositif de fabrication
WO2004036083A2 (fr) 2002-10-16 2004-04-29 Van Doorne's Transmissie B.V. Courroie d'entrainement a elements transversaux et dispositif d'estampage pour produire des elements transversaux

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010034320A2 (fr) * 2007-12-24 2010-04-01 Robert Bosch Gmbh Courroie d’entraînement
WO2010034320A3 (fr) * 2007-12-24 2010-05-20 Robert Bosch Gmbh Courroie d’entraînement

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JP2008525737A (ja) 2008-07-17
JP4837674B2 (ja) 2011-12-14
NL1027876C2 (nl) 2006-06-27

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