EP0000802B2 - Metal driving belt - Google Patents
Metal driving belt Download PDFInfo
- Publication number
- EP0000802B2 EP0000802B2 EP19780200129 EP78200129A EP0000802B2 EP 0000802 B2 EP0000802 B2 EP 0000802B2 EP 19780200129 EP19780200129 EP 19780200129 EP 78200129 A EP78200129 A EP 78200129A EP 0000802 B2 EP0000802 B2 EP 0000802B2
- Authority
- EP
- European Patent Office
- Prior art keywords
- driving belt
- transverse members
- belt
- friction
- transverse
- 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.)
- Expired
Links
- 239000002184 metal Substances 0.000 title claims description 9
- 230000001627 detrimental effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
Images
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 V-belt 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 a plurality of endless, metal belts having a continuous series of metal transverse members freely slidable with respect to the carrier thereon, and wherein, in the pushing run of the belt, successive transverse members are in contact with each other and relative movement between these transverse members is opposed by friction.
- 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.
- either one or both of the adjacent surfaces of each pair of adjacent transverse members is or 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 non-parallel 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.
- DE-A-2 557 724 which describes a V-belt with transverse members provided throughout their surfaces with means preventing relative transverse shifting. These are, however, interlocking means rather than friction-increasing means.
- 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 comprise 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 of 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)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Pulleys (AREA)
- Transmissions By Endless Flexible Members (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Description
- This invention relates to a driving V-belt 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 a plurality of endless, metal belts having a continuous series of metal transverse members freely slidable with respect to the carrier thereon, and wherein, in the pushing run of the belt, successive transverse members are in contact with each other and relative movement between these transverse members is opposed by friction.
- 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 7 312 089 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, because the 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, either one or both of the adjacent surfaces of each pair of adjacent transverse members is or 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 tranverse members perform, as it were, a vibration.
- It has been found that, by increasing the coefficient of friction between the transverse members it is possible to avoid the abovemen- tioned 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 non-parallel 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.
- For the sake of completeness, reference is made to DE-A-2 557 724, which describes a V-belt with transverse members provided throughout their surfaces with means preventing relative transverse shifting. These are, however, interlocking means rather than friction-increasing means.
- 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 apulley 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 shownshafts 4 and 5 can be varied infinitely in this way. The driving belt 3 comprises a number of metaltransverse members 6 slidably mounted on anendless carrier 7. Thiscarrier 7 may comprise, for example, a number of metal belts combined into one or more belt packs. Each of the preferably two belt packs comprise 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 thedriving 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 thattransverse members 6 are passed betweenpulleys 1 and 2 in a substantially linear path. A torque is thereby transmitted betweenpulleys 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 twoside surfaces 8 adapted to cooperate with the conical pulley parts of the V-shaped pulley 1, 2 and tworecesses 9, each adapted to receive abelt pack 7, as shown. Thebroken line 10 in Fig. 2 indicates the tilting line of the tilting zone, i.e. the place where thetransverse 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 thebroken 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)
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 EP0000802A1 (en) | 1979-02-21 |
EP0000802B1 EP0000802B1 (en) | 1981-12-30 |
EP0000802B2 true 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) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4386921A (en) * | 1980-04-28 | 1983-06-07 | Borg-Warner Corporation | Metal power transmission belt |
JPS6139141Y2 (en) * | 1981-06-24 | 1986-11-11 | ||
US4525159A (en) * | 1981-11-13 | 1985-06-25 | Valeo | Belt and pulley transmission |
US4718881A (en) * | 1985-02-12 | 1988-01-12 | Tsubakimoto Chain Co. | Frictional transmission chain |
FR2625783B1 (en) * | 1988-01-11 | 1990-05-11 | Caoutchouc Manuf Plastique | TRANSMISSION MEMBER FOR CONTINUOUS SPEED VARIATOR, WITH PUSHING CROSS LINKS AND FLEXIBLE CORE, OPERATING BY DRY FRICTION |
FR2660389B1 (en) * | 1990-04-02 | 1992-06-05 | Caoutchouc Manuf Plastique | FLEXIBLE LINK OF POWER TRANSMISSION, WITH A TRAPEZOUIDAL CORE AND PUSHING LINKS COVERED WITH FABRIC. |
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 |
JP3660047B2 (en) * | 1996-03-27 | 2005-06-15 | 本田技研工業株式会社 | Metal V belt type continuously variable transmission |
WO2002053938A1 (en) | 2000-12-28 | 2002-07-11 | Van Doorne's Transmissie B.V. | Belt |
EP1352182B1 (en) * | 2000-12-28 | 2004-11-10 | 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 |
Family Cites Families (4)
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 | |
NL155927B (en) * | 1975-10-09 | 1978-02-15 | Doornes Transmissie Bv | METAL DRIVE BELT AND PUSH ELEMENT IN FRONT OF THIS. |
DE2557724B2 (en) * | 1975-12-20 | 1978-10-12 | Hans Heynau Gmbh, 8000 Muenchen | Link V-belt |
-
1977
- 1977-08-04 NL NL7708639A patent/NL168307C/en not_active IP Right Cessation
-
1978
- 1978-08-03 EP EP19780200129 patent/EP0000802B2/en not_active Expired
- 1978-08-03 DE DE7878200129T patent/DE2861467D1/en not_active Expired
- 1978-08-04 JP JP9535278A patent/JPS5452253A/en active Granted
- 1978-08-04 ES ES472339A patent/ES472339A1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
ES472339A1 (en) | 1979-03-16 |
NL168307C (en) | 1982-03-16 |
NL7708639A (en) | 1979-02-06 |
EP0000802B1 (en) | 1981-12-30 |
DE2861467D1 (en) | 1982-02-18 |
JPS5452253A (en) | 1979-04-24 |
EP0000802A1 (en) | 1979-02-21 |
JPS6153567B2 (en) | 1986-11-18 |
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