EP3397876A1 - Élément transversal pour une courroie d'entraînement pour une transmission à variation continue - Google Patents

Élément transversal pour une courroie d'entraînement pour une transmission à variation continue

Info

Publication number
EP3397876A1
EP3397876A1 EP15817763.4A EP15817763A EP3397876A1 EP 3397876 A1 EP3397876 A1 EP 3397876A1 EP 15817763 A EP15817763 A EP 15817763A EP 3397876 A1 EP3397876 A1 EP 3397876A1
Authority
EP
European Patent Office
Prior art keywords
pillar
transverse member
drive belt
side face
base part
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP15817763.4A
Other languages
German (de)
English (en)
Inventor
Adrianus Antonius Jacobus Maria VAN TREIJEN
Guillaume Gerard Hubertus Rompen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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
Publication of EP3397876A1 publication Critical patent/EP3397876A1/fr
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16GBELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G5/00V-belts, i.e. belts of tapered cross-section
    • F16G5/16V-belts, i.e. belts of tapered cross-section consisting of several parts

Definitions

  • the present disclosure relates to a transverse member for a drive belt for a continuously variable transmission with two pulleys for accommodating the drive belt between the, at least partly conical pulley sheaves thereof.
  • the known drive belt comprises an endless, i.e. ring-shaped carrier that is composed of at least one, but typically of a set of nested, flexible rings and a number of these transverse members that together form an essentially contiguous row along the circumference of the endless carrier.
  • both the said flexible rings and the transverse members of the drive belt are made of metal, in particular steel.
  • the transverse members each include a predominantly width- wise, i.e. axially relative to the drive belt's circumfe ⁇ rence direction, extending base part with an, at least effectively, trapezoidal outline and two pillar parts that extend from a respective axial side of the base part in a direction essentially perpendicular to the aforementioned axial and circumference directions of the drive belt, i.e. in radial direction.
  • Each transverse member thus defines a centrally located opening between the pillar parts and the base part thereof, wherein a small circumferential section of the endless carrier is accommodated.
  • the base part and the pillar parts are integral parts of the known transverse member.
  • Such a drive belt with effectively V-shaped trans ⁇ verse members is known from, for example, the international patent publication No. WO2015/177372-A, in particular figure 5 thereof.
  • each transverse member is provided with a hook part that extends in axial direction over the endless carrier, such that the latter is contained in the central opening of the transverse members in radial direction during operation.
  • Two types of transverse member are included in the known drive belt, which types are differentiated by the said hook part thereof being associated with different pillar parts.
  • a so-called tilting zone is provided in the base part of the transverse members.
  • the tilting zone is an axially extending transition between a radially outer section of the transverse member of essentially constant thickness, i.e.
  • Such tilting zone and tapered inner section of the transverse member allow adjacent transverse members to mutually tilt in a curved trajectory part of the drive belt in the transmission, while these adjacent transverse members remain in physical contact through, at least, an axially oriented line of contact located in the tilting zone. It is noted that a ratio between respective radial positions of the tilting edge at the two transmission pulleys determines the (rotational) speed ratio between the pulleys and (thus) of the transmission.
  • each stud is inserted in a recess provided in an opposite, i.e. rear main face of an adjacent transverse member.
  • Such projection and recess serve to at least limit, a relative movement between adjacent transverse members in the row of transverse members of the drive belt, at least in radial direction, but typically also in axial direction.
  • the transverse member On either axial side of the base part thereof, the transverse member is provided with contact surfaces for frictionally engaging a pulley sheave of the transmission pulleys.
  • These pulley contact surfaces are mutually oriented at an angle, denoted the belt angle, that matches, at least by approxima- tion, an angle defined by and between the conical pulley sheaves of the pulleys, which latter angle is denoted the pulley angle.
  • these pulley contact surfaces are either corrugated or provided with a substantial surface roughness, such that only the peaks of the corrugation profile or surface roughness arrive in contact with the pulley sheave. This particular feature provides that cooling oil that is applied in the known transmission can be accommodated in the valleys of the said corrugation profile or surface roughness, thus improving the friction between the drive belt and the transmission pulleys.
  • the transverse members of the drive belt that are located between the pulley sheaves of a driving pulley of the transmission are driven in the direction of rotation thereof by friction forces being exerted by these pulley sheaves on the pulley contact surfaces of these transverse members.
  • driven transverse members push preceding transverse members along the circumference of the endless carrier of the drive belt and, ultimately, rotationally drive the driven pulley of the transmission, again by friction.
  • the pulley sheaves of a pulley are forced towards one another in axial direction, whereby these exert mutually opposed pinching force on the transverse members in the axial direction thereof.
  • FIG. 1 is a simplified and schematic side elevation of a transmission with two pulleys and a drive belt;
  • FIG. 2 illustrates the known drive belt with generally V-shaped transverse members in a cross-section thereof facing in its circumference direction and also includes a separate side elevation of only the transverse member thereof;
  • FIG. 3 schematically illustrates the novel transverse members according to the present disclosure.
  • Figure 1 schematically shows the central parts of a continuously variable transmission for use in a driveline of, for example, passenger motor vehicles.
  • This transmission is well-known per se and comprises at least a first variable pulley 101 and a second variable pulley 102.
  • the first pulley 101 is coupled to and driven by an engine and the second pulley 102 is typically coupled to driven wheels of the motor vehicle.
  • Both transmission pulleys 101, 102 comprise a first conical pulley sheave that is fixed to a pulley shaft 103, 104 of the respective pulley 101, 102 and a second conical pulley sheave that is axially displaceable relative to the respective pulley shaft 103, 104 and that is fixed thereto only in rotational direction.
  • a drive belt 50 of the transmission is wrapped around the pulleys 101, 102, while being accommodated between the pulley sheaves thereof.
  • the trajectory of the drive belt 50 in the transmission includes two straight sections ST and two curved sections CT where the drive belt 50 is curved around a respective one of the two transmission pulleys 101, 102.
  • the drive belt 50 is pinched by and between the pulley sheaves of both pulleys 101, 102 and thus provides a rotational connection there between by means of friction.
  • electronically controllable and hydraulically acting movement means that act on the respective moveable pulley sheave of each pulley 101, 102 are provided in the transmission (not shown) .
  • these movement means also control respective radial positions Rl and R2 of the drive belt at the pulleys 101, 102 and, hence, the speed ratio that is provided by the transmission between the pulley shafts 103, 104 thereof.
  • the known drive belt 50 is composed of an endless carrier 8 and a plurality of transverse members 1 that are mounted on the endless carrier 8 along the circumference thereof in an, at least essentially, contiguous row.
  • the transverse members 1 are movable along the circumference of the endless carrier 8, which endless carrier 8 is typically composed of a number of flexible metal rings or bands, which metal bands are stacked one around one another, i.e. are mutually nested.
  • the known drive belt 50 is illustrated in more detail.
  • the drive belt 50 is shown in a cross-section facing in the belt's circumference direction and on the left side of figure 2 a cross-section of only the transverse member 1 is shown.
  • the transverse members 1 of the drive belt 50 are generally shaped similar to the letter "V", i.e. are generally V-shaped, whereby an angle between the sides of the transverse members 1 is designed to closely match an angle present between the conical pulley sheaves of the transmission pulleys 101, 102.
  • the transverse member 1 comprises a base parts 10 and two pillar parts 11, whereof the base part 10 extends in the axial direction of the drive belt 50 and whereof the pillar parts 11 extend in the radial direction of the drive belt 50, each from a respective axial side of the base part 10. In its thickness direction, the transverse member 1 extends between a front main face 3 and a rear main face 4 thereof that are both oriented, at least generally, in the circumference direction of the drive belt 50. Between the pillar parts 11 and the base part 10 of the transverse member an opening 5 is defined, wherein a circumference section of the endless carrier 8 is accommodated.
  • the transverse member 1 is provided with a so-called tilting zone 4 in its front main face 3.
  • This tilting zone 4 represents an axially extending transition between a radially outer section of the transverse member of essentially constant thickness and a radially inner section thereof that is tapered in radial inward direction.
  • the tilting zone 4 is smoothly, convexly curved.
  • a stud 6 is provided that protrudes from the front main face 3 in, essentially, the said circumference direction.
  • the stud 6 is inserted in a recess 7 provided in the opposite, i.e. rear main face 3 of an adjacent transverse member 1 to limit a relative movement between the adjacent transverse members 1.
  • the transverse member 1 On the axial sides thereof, the transverse member 1 is provided with contact surfaces 12 for contacting (the pulley sheaves of) the transmission pulleys 101, 102.
  • each transverse member 1 is provided with a hook part 13 that in axial direction hangs over a part of the opening 5.
  • the drive belt includes both transverse members 1 of a first type I whereof the hook part is provided to the right-side pillar part 11-r, as well as transverse members 1 of a first type II whereof the hook part is provided to the left-side pillar part 11-1.
  • the endless carrier 8 is contained in the central openings 5 thereof by the hook parts 13 of the two types I, II of the transverse members 1 in the drive belt 50 to either axial side thereof.
  • These hook parts 13 engage the axial sides of the endless carrier 8 to prevent the separation of the transverse member 1 in radial inward direction relative to the endless carrier 8.
  • each individual transverse member 1 includes only one hook part 13, it can be mounted on the endless carrier 8 relatively easily when the drive belt 50 is assembled, provided that the axial or width dimension of the central opening 5 thereof exceeds the width of the endless carrier 8 by a sufficient amount.
  • the design of the known drive belt 50, in particular that of the transverse members 1 thereof can be optimised in terms of the shape and size, in particular an axial width, of the central opening 5 thereof, to favourably increase the width of the endless carrier 8 that can be fitted therein.
  • each transverse member 1 is moved towards the endless carrier 8 with the pillar part 11 thereof that is without the hook part 13 (i.e. the right-side pillar part 11-r in figure 3) being located on the radial inside of the endless carrier 8, until one axial side of the endless carrier 8 (i.e. its left side in figure 3) is located between the body part 10 and the hook part 13 of the other pillar part 11 of the transverse member 1 (i.e. the left-side pillar part 11-r in figure 3) .
  • the said axial side of the endless carrier 8 is thereby inserted in between such body part 10 and hook part 13 of the transverse member 1 as far as is possible without any substantial deformation of the endless carrier 8.
  • the transverse member 1 is rotated relative to the endless carrier 8 so as to align the body part 10 thereof endless carrier 8.
  • a favourably wide endless carrier 8 can be applied, while avoiding contact between the endless carrier 9 and the respective, i.e. right-side pillar part 11-r, by inclining at least at part of a side face 20 thereof facing the opening 5 in radial inward direction away from the other, i.e. left-side pillar part 11-1 of the transverse member 1.
  • such inclined part of the pillar side face 20 can be incorporated as a flat surface, but it can also be concavely curved, which latter embodiment is illustrated in figure 3.
  • a radius of concave curvature of the inclined part of the pillar side face 20 can be chosen to correspond to a width, i.e. axial dimension of the opening 5.
  • the inclined part of the pillar side face 20 is located radially inward of a position halfway a radial extend of the stud 6 (indicated in figure 3 by the dash-dot line intersecting the stud 6) . More in particular it is located radially inward of the complete radial extend of the stud 6.
  • the respective pillar part 11-r is optimally suited for accommodating the stud 6 therein, since an axial dimension or width of a radially outer extend of the respective pillar part 11-r remains unaffected by the said inclined part of the pillar side face 20.
  • the starting point and the amount of inclination of the inclined part of the pillar side face 20 is chosen such that it lies on or outside a virtual circle VC drawn around the stud 6 and touching the edges of the pillar part 11-r at two or more locations L.
  • This particular design feature is optimal for forming the stud 6 in the process of cutting and shaping the transverse member 1 from strip-shaped base material as is customary in the art.
  • the inclined part of the pillar side face 20 is preferably located at some distance D radially outward of the base part 10 of the transverse member 1.
  • a further, radially inner part of the pillar side face 20, located between said inclined part thereof and the base part 10, is then preferably oriented perpendicular to that base part 10 and/or in parallel with a side face facing the opening 5 of the opposite pillar part 11 (i.e. the left-side pillar part 11-1 in figure 3) .
  • said radially inner part of the pillar side face 20 provides a parallel abutment surface to a corresponding axial side face of the endless carrier 8, as is preferred and is customary in the art.
  • the said distance D corresponds to at least a dimension in radial direction or thickness of the endless carrier 8 and/or to a distance between the hook part 13 of the opposite pillar part 11-1 and the base part 10.

Landscapes

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

Abstract

L'invention concerne un élément transversal (1) pour une courroie d'entraînement (50) pour une transmission à variation continue qui comprend au moins un porteur sans fin (8) et un certain nombre de ces éléments transversaux (1), ledit élément transversal (1) comprenant une partie de base (10) et deux parties de pilier (11) qui sont respectivement disposées sur un côté respectif de la partie de base (10) de celui-ci et qui définissent une ouverture (5) de l'élément transversal (1) entre celles-ci, une première des deux parties de pilier (11) comportant une partie de crochet (13) qui s'étend dans la direction axiale sur une partie de la partie de base (10). Selon l'invention, une partie d'une face latérale (10) de l'autre des deux parties de pilier (11) est inclinée de façon à s'éloigner de la première partie de pilier (11) dans la direction de la partie de base (10).
EP15817763.4A 2015-12-29 2015-12-29 Élément transversal pour une courroie d'entraînement pour une transmission à variation continue Pending EP3397876A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2015/025117 WO2017114543A1 (fr) 2015-12-29 2015-12-29 Élément transversal pour une courroie d'entraînement pour une transmission à variation continue

Publications (1)

Publication Number Publication Date
EP3397876A1 true EP3397876A1 (fr) 2018-11-07

Family

ID=55066561

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15817763.4A Pending EP3397876A1 (fr) 2015-12-29 2015-12-29 Élément transversal pour une courroie d'entraînement pour une transmission à variation continue

Country Status (2)

Country Link
EP (1) EP3397876A1 (fr)
WO (1) WO2017114543A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019065931A (ja) * 2017-09-29 2019-04-25 トヨタ自動車株式会社 伝動ベルト
JP2019065930A (ja) * 2017-09-29 2019-04-25 トヨタ自動車株式会社 伝動ベルト

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0723643Y2 (ja) * 1989-11-16 1995-05-31 本田技研工業株式会社 金属vベルト
JP4371131B2 (ja) * 2006-08-28 2009-11-25 トヨタ自動車株式会社 伝動ベルトおよびその組付装置ならびにその組付方法
US8690719B2 (en) * 2009-11-20 2014-04-08 Toyota Jidosha Kabushiki Kaisha Push type driving belt
NL1040811B1 (en) 2014-05-22 2016-03-07 Bosch Gmbh Robert Drive belt for a continuously variable transmission with generally V-shaped transverse members.

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2017114543A1 *

Also Published As

Publication number Publication date
WO2017114543A1 (fr) 2017-07-06

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