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WO2008078981A1 - Transmission à variation continue - Google Patents

Transmission à variation continue Download PDF

Info

Publication number
WO2008078981A1
WO2008078981A1 PCT/NL2006/000672 NL2006000672W WO2008078981A1 WO 2008078981 A1 WO2008078981 A1 WO 2008078981A1 NL 2006000672 W NL2006000672 W NL 2006000672W WO 2008078981 A1 WO2008078981 A1 WO 2008078981A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulley
belt
transmission
elements
transverse elements
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.)
Ceased
Application number
PCT/NL2006/000672
Other languages
English (en)
Inventor
Paulus Adrianus Jospehus Maria Faes
Pieter Gerard Van Tilborg
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
Priority to CN200680056881.2A priority Critical patent/CN101617150B/zh
Priority to JP2009543969A priority patent/JP5228162B2/ja
Priority to EP06835688A priority patent/EP2126421A1/fr
Priority to PCT/NL2006/000672 priority patent/WO2008078981A1/fr
Publication of WO2008078981A1 publication Critical patent/WO2008078981A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • F16H—GEARING
    • F16H9/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members
    • F16H9/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion
    • F16H9/04—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes
    • F16H9/12—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members
    • F16H9/16—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members using two pulleys, both built-up out of adjustable conical parts
    • F16H9/18—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members using two pulleys, both built-up out of adjustable conical parts only one flange of each pulley being adjustable
    • 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
    • F16H—GEARING
    • F16H9/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members
    • F16H9/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion
    • F16H9/04—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes
    • F16H9/12—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members
    • F16H9/125—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members characterised by means for controlling the geometrical interrelationship of pulleys and the endless flexible member, e.g. belt alignment or position of the resulting axial pulley force in the plane perpendicular to the pulley axis
    • 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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/18—Means for guiding or supporting belts, ropes, or chains

Definitions

  • the present invention relates to a continuously variable transmission incorporating a push-type drive belt wrapped around two adjustable pulleys of the transmission, each defining a tapered groove of variable width between its pulley discs, as defined in the preamble of claim 1 , as well as to a method for operating such transmission.
  • Such a transmission is generally known, e.g. from European patent application EP-A-1 427 953 in the name of Applicant. It is a general development aim to optimise the design of the known transmission in terms of the throughput of driving power per unit of mass and/or volume of the transmission for a given range of transmission ratios, i.e. the ratio coverage of the transmission.
  • the performance of a transmission can in practice be limited, because of torque fluctuations that may occur in the transmission. These torque fluctuations can in certain operational conditions exceed a certain critical, or at least accepted level in terms of transmission durability, noise or even drive line vibrations as a result thereof.
  • the present invention aims to reduce such torque fluctuations in relation to the transmission power throughput, in order to improve the durability of the transmission and/or to allow a further increase in power throughput. Moreover, the inventions aims to accomplish this goal without a significant redesign of, in particular, the transmission drive belt component, i.e. to realise the same in a cost effective manner that, preferably, can be implemented quickly even in existing transmission designs.
  • this goal is realised by applying the measures as provided by the characterising portion of claim 1 and involving guiding means for guiding the drive belt, in particular the transverse elements thereof.
  • guiding means for guiding the drive belt, in particular the transverse elements thereof.
  • the guiding means at least position the elements in axial direction, so as to axially align the transverse elements with the pulley groove of the driving pulley.
  • the individual transverse elements arrive at the driving pulley that is axially offset relative to the pulley groove. This offset is, however, automatically corrected when the transverse elements enter, i.e. are clamped between the pulley discs and was therefore previously not considered a problem as long as the said offset is within an acceptable limit, as for example described in EP-A-0291 129.
  • the pulley discs are strongly forced together to effect a friction with the belt that is sufficient for transferring such torque, but as a result whereof the pulley discs deform elastically in such a manner that the pulley groove closes to a certain extend at the location where the transverse elements are entering the groove.
  • the elements are thus required to simultaneous align and deform to fit the pulley groove and as a result thereof experience a considerable and apparently fluctuating resistance at entering the groove. It is considered that such resistance is substantially reduced when the transverse elements are axially aligned with the pulley groove before entering it.
  • figure 1 is a schematic representation of a continuously variable transmission including a drive belt to which the present invention relates
  • figure 2 indicates a section of the belt shown in perspective
  • figure 3 is a graph of measurement results of a transmission input rotational speed and input and output torque as a function of time
  • figure 4 is a schematic representation of an embodiment of a guiding means according to the invention shown in perspective
  • figure 5 illustrates the principle working of the guiding means according to the invention
  • figure 6 is a graph similar to figure 3 of further measurement results.
  • Figure 1 shows the central parts of a known continuously variable transmission that is commonly applied in the drive-line of motor vehicles between the engine and the drive wheels thereof.
  • the transmission comprises two pulleys 1 , 2, each provided with two conical pulley discs 4, 5, where between a predominantly V-shaped pulley groove is defined and whereof one disc 4 is axially moveable along a respective pulley shaft 6, 7 over which it is placed.
  • a push-type drive belt 3 is wrapped around the pulleys 1 , 2 for transmitting a rotational movement and an accompanying torque from the one pulley 1 , 2 to the other 2, 1.
  • the transmission generally also comprises activation means that impose on the said at least one disc 4 an axially oriented clamping force Fax directed towards the respective other pulley disc 5 such that the belt 3 is clamped there between. Also, a speed ratio of the transmission is thereby determined, which hereinafter is defined as the ratio between the rotational speed of the driven pulley 2 and the rotational speed of the driving pulley 1.
  • the push-type drive belt 3 comprises an endless tensile means 31 and a multitude of plate-like transverse elements 33 that are provided on the tensile means 31 movable along its longitudinal direction and oriented predominantly transversely thereto.
  • the elements 33 take-up the clamping force Fax, such when an input torque Tin is exerted on the so-called driving pulley 1 , friction between the discs 4, 5 and the belt 3, causes the elements 33 to be thrust from the driving pulley 1 to the so-called driven pulley 2, exerting an output torque Tout thereon.
  • the transverse elements 33 are being guided and supported by the tensile means 31.
  • FIG 2 in a perspective view, shows a section of the belt 3 indicating a two part tensile means 31 and a number of transverse elements 33, which belt 3 is described in more detail in, for example, the said European patent publication EP-A-O 626 526.
  • the transverse elements define two predominantly transversely extending recesses 37 that open up in an axially direction towards the outside of the belt 3 and that are each associated with a bearing surface 19 of the element 33 for accommodating the tensile means 31 with some axial play there between.
  • the transverse elements 33 are provided with lateral side or pulley contact faces 35 that during operation are clamped between and arrive into frictional contact with the discs 4, 5 of the driving and driven pulleys 1 , 2 respectively.
  • the elements 33 are provided with a so-called rocking edge 34 on their respective front principle faces 38, which edge 34 defines an axially oriented, sharp or slightly rounded edge between two sections of the front principle face 38 that are mutually oriented at a small but notional angle.
  • the elements 33 are further provided with a projection 39 protruding from the front principle face 38 thereof, for interaction with a complementary hole provided in a back principle face thereof, and the elements 33.
  • Figure 2 also shows that a top part 40 of the elements 33 tapers towards the radial outside of the belt 3.
  • adjacent transverse elements 33 are laterally moveable relative to one another, as allowed by a play being provided both between the projection 39 and hole of the respective elements 33. This feature being present, inter alia, for the drive belt 3 to be able to accommodate an axial off-set between the pulley grooves of the respective pulleys 1 , 2.
  • the adjacent transverse elements 33 can rotate, at least about their projection 39 around a virtual axis oriented in the belt's longitudinal direction.
  • Figure 3 provides test bench measurement results of the rotational speed ⁇ 2 of the driven pulley 1 , the transmission input torque Tin and the transmission output torque Tout as a function of time t, during which measurement the driving pulley rotational speed ⁇ 1 is maintained essentially constant, i.e. controlled at a steady rpm.
  • FIG. 4 shows a possible embodiment of the guiding means 50 according to the invention in a perspective view.
  • the means comprising a roller 51 showing an predominantly V-shaped circumferential groove 52.
  • the roller 51 is rotatably mounted in a sub-frame 53, which is moveable relative to a mounting plate 54 of the guiding means 50 by means of an air cylinder 55, while being guided along a centre pin 56 of the guiding means 50.
  • the mounting plate 54 is be bolted to, for instance, a transmission housing, whereby the roller 51 s located at the radial outside of the belt 3 and whereby the V-shaped circumferential groove 52 of the roller 51 is axially aligned with the V-shaped pulley groove of a pulley 1 , 2 in at least one speed transmission ratio of the transmission, preferably the driving pulley 1 and preferably at least the speed ratio wherein a maximum (engine) power is transmitted by the transmission, the so-called TOP-ratio
  • the guiding means 50 are activated only in the said TOP ratio, whereby the air cylinder 55 is pressurised so that the roller 51 extents towards and engages the drive belt 3, whereby the tapered top part 40 of the transverse elements 33 is taken up in the circumferential groove 51.
  • the pressure in the air cylinder 55 determines the force that is exerted by the roller 51 onto the belt 3 in an essentially radial inward direction.
  • a transverse element 33a that is entering the V- shaped circumferential groove 52 of the roller 51 and that is axially displaced relative thereto will be positioned by an interaction of its top part 40 with the roller 51 , such that an element 33b that is leaving this groove 52 is axially aligned therewith, as is illustrated in figure 5.
  • the transverse element 33 is pre-aligned therewith in axial direction. According to the present invention, such measure favourably reduces the resistance experienced by the elements 33 at entering between the discs 4, 5 of the respective pulley 1 , 2, as a result whereof the above-mentioned torque fluctuations show a significant reduction.
  • the roller 51 may be actively driven, for example in order to minimise power losses due to friction between the roller 51 and the transverse elements 33.
  • the roller 51 is thereto rotationally connected to the respective pulley 1 , 2.
  • the guiding means 50 can be arranged in the transmission axially displaceable, whereby the axial position of the (V-shaped circumferential groove 52 of the) roller 51 is preferably linked to that of the axially moveable pulley disc 4 of the respective pulley 1 , 2. This feature allows the guiding means 50 to be active in any speed ratio of the transmission, i.e. to follow the axial displacement of the respective pulley groove.
  • the force with which the roller 51 engages the belt 3, i.e. the pressure in the air cylinder 55 is controllable, at least in relation to its rotational speed.
  • the said forces should be controlled to increase as the rotational speed of the belt 3 increases and vice versa.
  • This particular feature of the present invention is based on experimental observations. On the one hand it has been observed that, if the said force is too low in relation to the belt speed, the said torque fluctuations persists or at least can be dampened further by increasing the said force.
  • the driven pulley rotational speed co2 is decreased such that the transmission operates at a disadvantageously lowered efficiency, even though the said torque fluctuations remain effectively dampened.

Landscapes

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

Abstract

L'invention concerne une transmission à variation continue pourvue d'une courroie de transmission de type à poussée (3) comprenant : plusieurs éléments transversaux (33) pouvant être déplacés le long d'un moyen élastique sans fin (31) de la courroie (3), ce moyen élastique (31) étant logé dans une cavité (37) desdits éléments (33) avec un jeu en direction axiale; et un ensemble de poulies (1, 2) comprenant respectivement deux disques de poulie (4, 5) disposés sur un arbre de poulie respectif (6, 7), un sillon de poulie sensiblement en forme de V étant défini entre les deux disques de poulie. Le sillon est ou peut être décalé axialement, la courroie de transmission (3) étant enroulée autour des poulies (1, 2) calées entre les disques de poulie respectif (4, 5). Selon l'invention, ladite transmission (1) est pourvue de moyens de guidage (50) conçus pour positionner les éléments transversaux (33) de la courroie (3) entre les poulies (1, 2).
PCT/NL2006/000672 2006-12-27 2006-12-27 Transmission à variation continue Ceased WO2008078981A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN200680056881.2A CN101617150B (zh) 2006-12-27 2006-12-27 无级变速器
JP2009543969A JP5228162B2 (ja) 2006-12-27 2006-12-27 連続可変変速機
EP06835688A EP2126421A1 (fr) 2006-12-27 2006-12-27 Transmission à variation continue
PCT/NL2006/000672 WO2008078981A1 (fr) 2006-12-27 2006-12-27 Transmission à variation continue

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/NL2006/000672 WO2008078981A1 (fr) 2006-12-27 2006-12-27 Transmission à variation continue

Publications (1)

Publication Number Publication Date
WO2008078981A1 true WO2008078981A1 (fr) 2008-07-03

Family

ID=38461998

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2006/000672 Ceased WO2008078981A1 (fr) 2006-12-27 2006-12-27 Transmission à variation continue

Country Status (4)

Country Link
EP (1) EP2126421A1 (fr)
JP (1) JP5228162B2 (fr)
CN (1) CN101617150B (fr)
WO (1) WO2008078981A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017054808A1 (fr) * 2015-09-29 2017-04-06 Schaeffler Technologies AG & Co. KG Glissière pour élément souple de transmission, et procédé de mesure pour mesurer un couple de rotation appliqué à une poulie à flasques coniques

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10473195B2 (en) * 2017-06-06 2019-11-12 GM Global Technology Operations LLC Continuously-variable transmission

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS629060A (ja) 1985-07-04 1987-01-17 Honda Motor Co Ltd ベルト伝動型無段変速機のベルト防振構造
EP0291129A1 (fr) 1987-05-13 1988-11-17 Van Doorne's Transmissie B.V. Transmission continue avec alignement de poulies corrigé
JPH0328555A (ja) 1989-06-27 1991-02-06 Nissan Motor Co Ltd Ｖベルト式無段変速機
JPH0392652A (ja) * 1989-09-04 1991-04-17 Kayseven Co Ltd 無段変速装置
JP2003148571A (ja) * 2001-11-14 2003-05-21 Fuji Heavy Ind Ltd 無段変速機
EP1427953A1 (fr) 2001-09-04 2004-06-16 Van Doorne's Transmissie B.V. Transmission variable en continu efficace, a couple eleve
WO2005045282A1 (fr) * 2003-11-06 2005-05-19 Robert Bosch Gmbh Transmission variable en continu

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3975003B2 (ja) * 1998-05-29 2007-09-12 本田技研工業株式会社 ベルト式無段変速機のベルト案内装置
JP3267596B2 (ja) * 2000-05-19 2002-03-18 ダイハツ工業株式会社 無段変速機
ITTO20030314A1 (it) * 2003-04-23 2004-10-24 Dayco Europe Srl Puleggia per una trasmissione a variazione continua di rapporto.

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS629060A (ja) 1985-07-04 1987-01-17 Honda Motor Co Ltd ベルト伝動型無段変速機のベルト防振構造
EP0291129A1 (fr) 1987-05-13 1988-11-17 Van Doorne's Transmissie B.V. Transmission continue avec alignement de poulies corrigé
JPH0328555A (ja) 1989-06-27 1991-02-06 Nissan Motor Co Ltd Ｖベルト式無段変速機
JPH0392652A (ja) * 1989-09-04 1991-04-17 Kayseven Co Ltd 無段変速装置
EP1427953A1 (fr) 2001-09-04 2004-06-16 Van Doorne's Transmissie B.V. Transmission variable en continu efficace, a couple eleve
JP2003148571A (ja) * 2001-11-14 2003-05-21 Fuji Heavy Ind Ltd 無段変速機
WO2005045282A1 (fr) * 2003-11-06 2005-05-19 Robert Bosch Gmbh Transmission variable en continu

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017054808A1 (fr) * 2015-09-29 2017-04-06 Schaeffler Technologies AG & Co. KG Glissière pour élément souple de transmission, et procédé de mesure pour mesurer un couple de rotation appliqué à une poulie à flasques coniques
US10895307B2 (en) 2015-09-29 2021-01-19 Schaeffler Technologies AG & Co. KG Slide rail for a wrap-around means of a continuously variable transmission and measurement method for determining a torque present at a cone pulley pair

Also Published As

Publication number Publication date
CN101617150B (zh) 2013-03-13
JP5228162B2 (ja) 2013-07-03
CN101617150A (zh) 2009-12-30
JP2010515000A (ja) 2010-05-06
EP2126421A1 (fr) 2009-12-02

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