WO2004031612A1 - Push belt with unwind elements - Google Patents
Push belt with unwind elements Download PDFInfo
- Publication number
- WO2004031612A1 WO2004031612A1 PCT/NL2003/000681 NL0300681W WO2004031612A1 WO 2004031612 A1 WO2004031612 A1 WO 2004031612A1 NL 0300681 W NL0300681 W NL 0300681W WO 2004031612 A1 WO2004031612 A1 WO 2004031612A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- push belt
- unwind
- links
- unwinding
- push
- Prior art date
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
- F16G5/18—V-belts, i.e. belts of tapered cross-section consisting of several parts in the form of links
-
- 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
- F16H15/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
- F16H15/48—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members with members having orbital motion
- F16H15/50—Gearings providing a continuous range of gear ratios
- F16H15/54—Gearings providing a continuous range of gear ratios in which two members co-operate by means of rings or by means of parts of endless flexible members pressed between the first-mentioned members
-
- 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
- F16H15/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
- F16H15/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members without members having orbital motion
- F16H15/04—Gearings providing a continuous range of gear ratios
- F16H15/06—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B
- F16H15/16—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a conical friction surface
- F16H15/18—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a conical friction surface externally
- F16H15/22—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a conical friction surface externally the axes of the members being parallel or approximately parallel
-
- 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
- F16H15/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
- F16H15/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members without members having orbital motion
- F16H15/04—Gearings providing a continuous range of gear ratios
- F16H15/06—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B
- F16H15/16—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a conical friction surface
- F16H15/24—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a conical friction surface internally
Definitions
- the invention relates to a push belt, in particular for a continuously variable transmission.
- the principle of such a push belt and continuously variable transmission is known from for instance European patent no. 688 407.
- the push belt is driven by a first friction disc, and the push belt in turn drives a second disc.
- a transmission ratio is obtained due to the difference in diameter between the two discs, and the transmission ratio can thus be varied by varying the position of the push belt.
- the links of the push belt circulate between the contact surface with the first friction disc and the contact surface with the second friction disc.
- the push belt links hereby move relative to each other in this transition zone. This relative movement takes place by means of a sliding movement. This sliding movement results in friction, which has an adverse effect on the efficiency of the transmission.
- a push belt comprising successively placed push belt links forming a belt, wherein an unwind element is placed in each case between two adjacent push belt links.
- This unwind element makes it possible for two adjacent push belt links to make an unwinding movement relative to each other.
- a sliding or shifting movement typical of known push belts is prevented by this unwinding movement.
- the friction in a push belt according to the invention is considerably lower, since the friction resulting from the sliding movement is reduced considerably and there remains only a rolling friction.
- the unwind element makes it further possible that in the transition zone, in which a link moves from contact with the first friction disc to contact with the second friction disc, the misalignment between the two links is compensated and the forces are transferred better. It is hereby possible to transmit a greater torque with a push belt according to the invention than with conventional push belts.
- the position of the unwind elements is not determined by contact surfaces with the friction discs. The position of the unwind elements can hereby be adjusted for a good force transmission between the adjacent push belt links.
- each unwind element comprises at least two first unwinding surfaces arranged on either side, and the push belt links adjacent to the unwind element each comprise a second unwinding surface co-acting with a first unwinding surface. At least one of the first or the second unwinding surfaces is herein curved.
- This curvature defines the unwinding movement two push belt links can make relative to each other.
- the radius of curvature of the first unwinding surfaces differs from the radius of curvature of the second unwinding surfaces .
- the first unwinding surfaces can herein be concave and the second unwinding surfaces convex.
- the push belt links each comprise adjacently of the unwind elements at least one recess into which the adjacent unwind element at least partly protrudes. This ensures that the push belt links and unwind elements can no longer shift relative to each other in radial direction.
- the unwind elements each comprise at least one recess into which one of the adjacent push belt links at least partly protrudes.
- Figure 1 shows a cross-sectional view of a continuously variable transmission in which a push belt according to the invention can be applied.
- Figures 2a and 2b show in cross-sectional view a prior art push belt.
- Figure 3 shows in cross-sectional view and with exploded parts a first embodiment of a push belt according to the invention.
- Figure 4 shows the push belt of figure 3 in the assembled state.
- Figure 5 shows a second embodiment of a push belt according to the invention.
- Figure 1 shows a continuously variable transmission, the principle of which is known from for instance the European publication EP-B-0 688 407.
- This transmission 1 has an input shaft 2 which is arranged displaceably. On this input shaft 2 is arranged a first friction disc 3 on which a push belt 4 is placed. In the shown position the push belt 4 makes contact at the position 5 with friction disc 3.
- the driving force of input shaft 2 is hereby transmitted by push belt 4.
- Push belt 4 further lies against two friction discs 6.
- the driving force of input shaft 2 is thus transmitted via push belt 4 to friction discs 6, which can then be coupled to an output shaft.
- a transmission ratio is thus obtained through the difference in diameter between the first friction disc 3 and the second friction discs 6.
- FIGs 2a and 2b show a detail of push belt 4.
- This push belt is a prior art embodiment.
- FIG 2a can be seen a part of friction disc 3 and the push belt 4 arranged therein.
- Figure 2b shows a side view of push belt 4.
- This push belt 4 consists of push belt links 7 which are provided on both sides with recesses 9. Cylindrical coupling parts 8 fall into these recesses 9. Coupling parts 8 and recesses 9 ensure that the position of the adjacent links 7 relative to each other remains fixed.
- links 7 will slide relative to each other, wherein coupling parts 8 slide in recesses 9 and thus cause friction.
- Figure 3 shows the components of a push belt according to the invention.
- This push belt comprises push belt links 10 having an unwind element 11 placed therebetween.
- Figure 4 shows these components 10 and 11 assembled to form a push belt 12.
- the unwind element 11 has a substantially rectangular cross-section.
- first unwinding surfaces 13 which in this embodiment take a flat form.
- These first unwinding surfaces 13 can also take a concave form.
- Push belt links 10 each comprise on either side a recess in which a second unwinding surface 14 is arranged.
- This unwinding surface 14 is convex and has a radius Rj . .
- the radius of unwinding surfaces 13 must be greater than the radius R x .
- FIG. 5 shows a second embodiment of a push belt 20 according to the invention.
- This push belt 20 once again comprises push belt links 21 with unwind elements 22 placed therebetween.
- Links 21 are provided with a curved unwinding surface 23.
- Unwind elements 22 are provided with a straight unwinding surface 24. These unwinding surfaces 24 are arranged in a recess of unwind element 22. This once again ensures the relative position of links 21 and unwind elements 22 in radial direction.
- figure 5 is a cross-sectional view. Further arranged on links 21 are friction surfaces (not shown) which can be brought into contact with friction discs 3 and 6. It is furthermore evident that unwind elements do not have to be arranged between all push belt links. However, where they are absent on specific parts, the friction due to sliding will return once again.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003275729A AU2003275729A1 (en) | 2002-10-07 | 2003-10-06 | Push belt with unwind elements |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL1021597A NL1021597C2 (en) | 2002-10-07 | 2002-10-07 | Push belt with rolling elements. |
NL1021597 | 2002-10-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004031612A1 true WO2004031612A1 (en) | 2004-04-15 |
Family
ID=32065073
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NL2003/000681 WO2004031612A1 (en) | 2002-10-07 | 2003-10-06 | Push belt with unwind elements |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2003275729A1 (en) |
NL (1) | NL1021597C2 (en) |
WO (1) | WO2004031612A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007067038A2 (en) | 2005-12-05 | 2007-06-14 | Hamapro Holding B.V. | Continuously variable transmission with a disc-shaped transmission element made from one piece |
EP3431817A1 (en) * | 2017-07-18 | 2019-01-23 | Viktor Schweizer | Adjustable variable-pitch sheave drive |
WO2023278358A1 (en) * | 2021-06-28 | 2023-01-05 | Sri International | Transmission with radially inverted pulleys |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE257155C (en) * | ||||
US1898035A (en) * | 1931-01-29 | 1933-02-21 | Clipper Belt Lacer Company | Link belt |
GB797312A (en) * | 1955-02-18 | 1958-07-02 | Werner Reimers | An improved transmission chain for conical or v-type pulleys |
DE1137609B (en) * | 1960-08-30 | 1962-10-04 | Reimers Getriebe K G | Link chain for a stepless pulley belt drive |
US4657525A (en) * | 1984-10-01 | 1987-04-14 | Ab Volvo | Transmission chain |
EP0688407B1 (en) * | 1993-03-19 | 1997-09-24 | Heerke Hoogenberg | Mechanical gearing |
-
2002
- 2002-10-07 NL NL1021597A patent/NL1021597C2/en not_active IP Right Cessation
-
2003
- 2003-10-06 AU AU2003275729A patent/AU2003275729A1/en not_active Abandoned
- 2003-10-06 WO PCT/NL2003/000681 patent/WO2004031612A1/en not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE257155C (en) * | ||||
US1898035A (en) * | 1931-01-29 | 1933-02-21 | Clipper Belt Lacer Company | Link belt |
GB797312A (en) * | 1955-02-18 | 1958-07-02 | Werner Reimers | An improved transmission chain for conical or v-type pulleys |
DE1137609B (en) * | 1960-08-30 | 1962-10-04 | Reimers Getriebe K G | Link chain for a stepless pulley belt drive |
US4657525A (en) * | 1984-10-01 | 1987-04-14 | Ab Volvo | Transmission chain |
EP0688407B1 (en) * | 1993-03-19 | 1997-09-24 | Heerke Hoogenberg | Mechanical gearing |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007067038A2 (en) | 2005-12-05 | 2007-06-14 | Hamapro Holding B.V. | Continuously variable transmission with a disc-shaped transmission element made from one piece |
WO2007067038A3 (en) * | 2005-12-05 | 2008-03-13 | Hamapro Holding B V | Continuously variable transmission with a disc-shaped transmission element made from one piece |
EP3431817A1 (en) * | 2017-07-18 | 2019-01-23 | Viktor Schweizer | Adjustable variable-pitch sheave drive |
WO2023278358A1 (en) * | 2021-06-28 | 2023-01-05 | Sri International | Transmission with radially inverted pulleys |
Also Published As
Publication number | Publication date |
---|---|
AU2003275729A1 (en) | 2004-04-23 |
NL1021597C2 (en) | 2004-04-08 |
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