EP0000802A1 - Metal driving belt - Google Patents

Metal driving belt Download PDF

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Publication number
EP0000802A1
EP0000802A1 EP19780200129 EP78200129A EP0000802A1 EP 0000802 A1 EP0000802 A1 EP 0000802A1 EP 19780200129 EP19780200129 EP 19780200129 EP 78200129 A EP78200129 A EP 78200129A EP 0000802 A1 EP0000802 A1 EP 0000802A1
Authority
EP
European Patent Office
Prior art keywords
driving belt
transverse members
carrier
transverse
friction
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.)
Granted
Application number
EP19780200129
Other languages
German (de)
French (fr)
Other versions
EP0000802B1 (en
EP0000802B2 (en
Inventor
Emerie Frederik Marie Hendriks
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.)
Bosch Transmission Technology BV
Original Assignee
Van Doornes Transmissie BV
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=19828974&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0000802(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Van Doornes Transmissie BV filed Critical Van Doornes Transmissie BV
Publication of EP0000802A1 publication Critical patent/EP0000802A1/en
Publication of EP0000802B1 publication Critical patent/EP0000802B1/en
Application granted granted Critical
Publication of EP0000802B2 publication Critical patent/EP0000802B2/en
Expired legal-status Critical Current

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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

Definitions

  • This invention relates to a driving belt having a trapezoidal cross-sectional configuration and suitable to transmit a torque between expanding pulleys formed of pairs of conical discs defining a V-shaped space between them for receiving the driving belt,
  • driving belt comprises a carrier in the form of one or more endless, metal belts having a continuous series of transverse members freely slidable with respect to the carrier thereon, which transverse members define the cross-sectional configuration of the driving belt.
  • Such a driving belt is known from Dutch patent 142,767, in which the operation of the driving belt, which transmits the torque by means of pushing force, is explained.
  • Such a driving belt is particularly suitable for use in an infinitely variable transmission.
  • a drawback of such a driving belt is that under certain working conditions the transverse members may shift in transverse direction to cause heavy wear. During this lateral shifting the transverse members strike the flanks of the belt or belts forming the carrier.
  • At least a number of the substantially parallel surfaces with which the transverse members are in contact with each other in a straight part of the belt are provided with friction-increasing means.
  • the friction-increasing means comprise a knurling of small depth, for instance some hundredths of a millimeter.
  • this knurling can be formed by grinding the surface in two directions, called cross-grinding.
  • the knurling on the surface is such that it is maintained during use of the driving belt, and consequently does not easily wear out, or disappear during running in of the driving belt.
  • Fig. 1 shows schematically two V-shaped pulleys 1, 2.
  • the running diameter of the driving belt 3 on a pulley 1, 2 can be varied by adjusting the mutual distance of the conical pulley parts of the V-shaped pulley 1, 2.
  • the ratio of the rotary speeds between the schematically shown shafts 4 and 5 can be varied infinitely in this way.
  • the driving belt 3 comprises a number of metal transverse members 6 slidably mounted on an endless carrier 7.
  • This carrier 7 may comprise, for example, a number of metal belts combined into one or more belt packs.
  • Each of the preferably two belt packs comprises a number, for example ten, of superposed metal belts which are slidable about and with respect to each other. (In Fig. 1 a pack of only 4 belts is shown).
  • the transverse members 6 are slightly tapered radially inwardly of the driving belt, which enables the driving belt 6 to run about the pulley with curvature, as shown in Fig. 1.
  • Fig. 2 shows a transverse member 6 (shown in Fig. 1 in side elevational view) in front elevational view.
  • Transverse member 6 comprises two side surfaces 8 adapted to cooperate with the conical pulley parts of the V-shaped pulley 1, 2 and two recesses 9, each adapted to receive a belt pack 7, as shown.
  • the broken line 10 in Fig. 2 indicates the tilting line or the tilting zone, i.e. the place where the transverse member 6 starts tapering.
  • the transverse members are in contact with each other with the surface shown in cross-hatched lines in Fig. 2 above the broken line 10.
  • This hatching indicates the two grinding directions in which the surface has been ground so as to produce such grooves in the surface-that with relatively small pressure forces between the transverse members the mutual friction in transverse direction is great.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmissions By Endless Flexible Members (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Pulleys (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

A driving belt having a trapezoidal cross-sectional configuration and suitable to transmit a torque between expanding pulleys formed of pairs of conical discs defining a 'V-shaped apace between them for receiving the driving belt, which driving belt comprises a carrier in the form of one or a number of endless metal belts having a continuous series of transverse members (6) freely slidable with respect to the carrier thereon. In such a driving belt there may be a lateral vibration of the transverse members under certain conditions. This vibration, during which the transverse members (6) strike the carrier, results in wear, which can be considerably reduced by providing the parallel surfaces with which the transverse members contact each other with friction-increasing means, such as a grooved surface.

Description

  • This invention relates to a driving belt having a trapezoidal cross-sectional configuration and suitable to transmit a torque between expanding pulleys formed of pairs of conical discs defining a V-shaped space between them for receiving the driving belt, which driving belt comprises a carrier in the form of one or more endless, metal belts having a continuous series of transverse members freely slidable with respect to the carrier thereon, which transverse members define the cross-sectional configuration of the driving belt.
  • Such a driving belt is known from Dutch patent 142,767, in which the operation of the driving belt, which transmits the torque by means of pushing force, is explained. Such a driving belt is particularly suitable for use in an infinitely variable transmission.
  • A drawback of such a driving belt is that under certain working conditions the transverse members may shift in transverse direction to cause heavy wear. During this lateral shifting the transverse members strike the flanks of the belt or belts forming the carrier.
  • To solve this problem, it is proposed in Dutch patent application 73,12089 to provide the transverse members with fixing means which fully prevent shifting in transverse direction. To this end it is proposed to provide the transverse members with interengaging means.
  • Practice has shown, however, that such a solution is not satisfactory, becausethe slightest freedom of relative lateral movement between two successive transverse members will result in an impermissibly great slidability in transverse direction over a number of transverse members.
  • It is an object of the present invention to provide a driving belt of the type described above, while preventing wear due to shifting of the transverse members in transverse direction.
  • To this end, at least a number of the substantially parallel surfaces with which the transverse members are in contact with each other in a straight part of the belt are provided with friction-increasing means.
  • Experiments have shown that the detrimental shifting of the transverse members in transverse direction occurs in the pushing run of the driving belt, if the torque being transmitted is relatively small, i.e. only in the situation where a relatively slight mutual pushing force between the transverse members is present. In the slack run, where there is no pushing force at all, and, in the other run, if the transverse members are pushed onto one another with great force, no detrimental shifting occurs.
  • From these findings it has been concluded that the cause of shifting of the transverse members in transverse direction should be found in the shifting of the transverse members along one another in such a manner that a force in transverse direction is transmitted between the successive members. This may create a situation in which ; the series of transverse members perform, as it were, a vibration.
  • It has been found that, by increasing the coefficient friction between the transverse members it is possible to avoid the above-mentioned detrimental shifting in a technically easily feasible way. The relative shifting of the transverse members in the slack run, which is not prevented in this way, appears to have no adverse effect in practice.
  • In accordance with a preferred embodiment of the present invention, the friction-increasing means comprise a knurling of small depth, for instance some hundredths of a millimeter. According to the invention, this knurling can be formed by grinding the surface in two directions, called cross-grinding.
  • It is important that the knurling on the surface is such that it is maintained during use of the driving belt, and consequently does not easily wear out, or disappear during running in of the driving belt.
  • One embodiment of the driving belt according to the invention will now be described, by way of example, with reference to the accompanying drawings. In said drawings,
    • Fig. 1 shows schematically a sectional view of two pulleys with a driving belt running thereon;
    • Fig. 2 shows a transverse member in front elevational view.
  • Fig. 1 shows schematically two V-shaped pulleys 1, 2. The running diameter of the driving belt 3 on a pulley 1, 2 can be varied by adjusting the mutual distance of the conical pulley parts of the V-shaped pulley 1, 2. The ratio of the rotary speeds between the schematically shown shafts 4 and 5 can be varied infinitely in this way. The driving belt 3 comprises a number of metal transverse members 6 slidably mounted on an endless carrier 7. This carrier 7 may comprise, for example, a number of metal belts combined into one or more belt packs. Each of the preferably two belt packs comprises a number, for example ten, of superposed metal belts which are slidable about and with respect to each other. (In Fig. 1 a pack of only 4 belts is shown).
  • The transverse members 6 are slightly tapered radially inwardly of the driving belt, which enables the driving belt 6 to run about the pulley with curvature, as shown in Fig. 1.
  • During operation of the driving belt there is such a tension in carrier 7 that transverse members 6 are passed between pulleys 1 and 2 in a substantially linear path. A torque is thereby transmitted between pulleys 1 and 2 due to the pushing force with which the transverse members push against each other in the loaded run of the driving belt.
  • Fig. 2 shows a transverse member 6 (shown in Fig. 1 in side elevational view) in front elevational view. Transverse member 6 comprises two side surfaces 8 adapted to cooperate with the conical pulley parts of the V-shaped pulley 1, 2 and two recesses 9, each adapted to receive a belt pack 7, as shown. The broken line 10 in Fig. 2 indicates the tilting line or the tilting zone, i.e. the place where the transverse member 6 starts tapering. In the substantially straight, pushing run of the driving belt, the transverse members are in contact with each other with the surface shown in cross-hatched lines in Fig. 2 above the broken line 10. This hatching indicates the two grinding directions in which the surface has been ground so as to produce such grooves in the surface-that with relatively small pressure forces between the transverse members the mutual friction in transverse direction is great.

Claims (3)

1. A driving belt having a trapezoidal cross-sectional configuration and suitable to transmit a torque between expanding pulleys formed of pairs of conical discs which define a V-shaped space between them for receiving the driving belt, which driving belt comprises a carrier in the form of one or a number of endless, metal belts having a continuous series of transverse members freely slidable with respect to the carrier thereon, which transverse members define the cross-sectional configuration of the driving belt, characterized in that at least a number of the substantially parallel surfaces with which the transverse members are in contact with each other on a straight part of the belt are provided with , friction-increasing means.
2. A driving belt according to claim 1, characterized in that the friction-increasing means comprise a knurling of small depth.
3. A driving belt according to claim 2, characterized in that the knurling is formed by grinding the surface in two directions.
EP19780200129 1977-08-04 1978-08-03 Metal driving belt Expired EP0000802B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL7708639A NL168307C (en) 1977-08-04 1977-08-04 DRIVE BELT.
NL7708639 1977-08-04

Publications (3)

Publication Number Publication Date
EP0000802A1 true EP0000802A1 (en) 1979-02-21
EP0000802B1 EP0000802B1 (en) 1981-12-30
EP0000802B2 EP0000802B2 (en) 1989-07-12

Family

ID=19828974

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19780200129 Expired EP0000802B2 (en) 1977-08-04 1978-08-03 Metal driving belt

Country Status (5)

Country Link
EP (1) EP0000802B2 (en)
JP (1) JPS5452253A (en)
DE (1) DE2861467D1 (en)
ES (1) ES472339A1 (en)
NL (1) NL168307C (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4386921A (en) * 1980-04-28 1983-06-07 Borg-Warner Corporation Metal power transmission belt
US4525159A (en) * 1981-11-13 1985-06-25 Valeo Belt and pulley transmission
US4968288A (en) * 1988-01-11 1990-11-06 Caoutchouc Manufacture Et Plastiques Variable speed transmission device
EP0451038A1 (en) * 1990-04-02 1991-10-09 Caoutchouc Manufacture Et Plastiques Power transmission belt with trapezoidal carrier and with fabric covered pushing blocks
US5105889A (en) * 1990-11-29 1992-04-21 Misikov Taimuraz K Method of production of formation fluid and device for effecting thereof
US5242332A (en) * 1990-04-02 1993-09-07 Caoutchouc Manufacture Et Plastiques S.A. Transmission arrangement with a covered transmission belt
EP0798492A1 (en) * 1996-03-27 1997-10-01 Honda Giken Kogyo Kabushiki Kaisha Metal v-belt type continuously variable transmission
WO2002053936A1 (en) * 2000-12-28 2002-07-11 Van Doorne's Transmissie B.V. Belt
WO2002053938A1 (en) 2000-12-28 2002-07-11 Van Doorne's Transmissie B.V. Belt
WO2002053937A1 (en) 2000-12-28 2002-07-11 Van Doorne's Transmissie B.V. Belt
WO2002053935A1 (en) 2000-12-28 2002-07-11 Van Doorne's Transmissie B.V. Belt

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6139141Y2 (en) * 1981-06-24 1986-11-11
US4718881A (en) * 1985-02-12 1988-01-12 Tsubakimoto Chain Co. Frictional transmission chain

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR81703E (en) * 1961-10-31 1963-11-02 G Ab Multiple friction variable speed drive
FR2031782A5 (en) * 1969-02-07 1970-11-20 Peugeot & Renault
DE2557724A1 (en) * 1975-12-20 1977-06-30 Heynau Gmbh Hans Pulley belt with articulation plates - has trapezoidally shaped plates held by belt along central plane to allow contact along edges

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL155927B (en) * 1975-10-09 1978-02-15 Doornes Transmissie Bv METAL DRIVE BELT AND PUSH ELEMENT IN FRONT OF THIS.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR81703E (en) * 1961-10-31 1963-11-02 G Ab Multiple friction variable speed drive
FR2031782A5 (en) * 1969-02-07 1970-11-20 Peugeot & Renault
DE2557724A1 (en) * 1975-12-20 1977-06-30 Heynau Gmbh Hans Pulley belt with articulation plates - has trapezoidally shaped plates held by belt along central plane to allow contact along edges

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4386921A (en) * 1980-04-28 1983-06-07 Borg-Warner Corporation Metal power transmission belt
US4525159A (en) * 1981-11-13 1985-06-25 Valeo Belt and pulley transmission
US4968288A (en) * 1988-01-11 1990-11-06 Caoutchouc Manufacture Et Plastiques Variable speed transmission device
US5123879A (en) * 1988-01-11 1992-06-23 Caoutchouc Manufacture Et Plastiques Variable speed transmission device
EP0451038A1 (en) * 1990-04-02 1991-10-09 Caoutchouc Manufacture Et Plastiques Power transmission belt with trapezoidal carrier and with fabric covered pushing blocks
US5171189A (en) * 1990-04-02 1992-12-15 Caoutchouc Manufacture Et Plastiques S.A. Transmission arrangement with a covered transmission belt
US5242332A (en) * 1990-04-02 1993-09-07 Caoutchouc Manufacture Et Plastiques S.A. Transmission arrangement with a covered transmission belt
US5105889A (en) * 1990-11-29 1992-04-21 Misikov Taimuraz K Method of production of formation fluid and device for effecting thereof
EP0798492A1 (en) * 1996-03-27 1997-10-01 Honda Giken Kogyo Kabushiki Kaisha Metal v-belt type continuously variable transmission
US5800298A (en) * 1996-03-27 1998-09-01 Honda Giken Kogyo Kabushiki Kaisha Metal V-belt type continuously variable transmission
CN1095955C (en) * 1996-03-27 2002-12-11 本田技研工业株式会社 Metal V-belt type continuously variable transmission
WO2002053936A1 (en) * 2000-12-28 2002-07-11 Van Doorne's Transmissie B.V. Belt
WO2002053938A1 (en) 2000-12-28 2002-07-11 Van Doorne's Transmissie B.V. Belt
WO2002053937A1 (en) 2000-12-28 2002-07-11 Van Doorne's Transmissie B.V. Belt
WO2002053935A1 (en) 2000-12-28 2002-07-11 Van Doorne's Transmissie B.V. Belt
US7108624B2 (en) 2000-12-28 2006-09-19 Van Doorne's Transmissie B.V. Belt

Also Published As

Publication number Publication date
EP0000802B1 (en) 1981-12-30
JPS6153567B2 (en) 1986-11-18
NL7708639A (en) 1979-02-06
ES472339A1 (en) 1979-03-16
JPS5452253A (en) 1979-04-24
DE2861467D1 (en) 1982-02-18
NL168307C (en) 1982-03-16
EP0000802B2 (en) 1989-07-12

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