Claims
- 1. A composite driving belt provided with a carrier and a plurality of transverse elements assembled slidably thereon, the carrier comprising one or more bands, preferably composed of a plurality of endless metal bands disposed radially around each other, each element being provided with a radially outward directed carrier contact plane for contacting a radial inner contact plane of said carrier while in operation, characterised in that the contact plane of both the carrier and the element have a relatively smooth surface.
- 2. Belt according to claim 1, characterised in that the carrier contact face of an element is shaped such that the contact between an element and the carrier, in any of the possible drive ratios for the belt, defines a wedge shaped space between the carrier contact face of the element and the contact face of the carrier.
- 3. Belt according to claim 1, characterised in that the combined roughness Ra′ of both the contact plane of the element is lower than 0.10 μm.
- 4. Belt according to claim 1, characterised in that the roughness of the inner contacting face of the carrier is of a value lower than 0.2 μm.
- 5. Belt according to claim 1, characterised in that the roughness of the inner contacting face of the carrier is of a value lower than 0.10 μm.
- 6. Belt according to claim 1, characterised in that the contacting face of the carrier, at least once having run for two hours in a most accelerating transmission ratio (OD) within a transmission for which the belt is designed, has a roughness equal to or lower than 0.05 μm.
- 7. Belt according to claim 6, characterised in that each contacting face, of the carrier and an element, has a roughness equal to or lower than 0.05 μm.
- 8. Belt according to claim 1, characterised in that the carrier contact plane of the element as seen in side elevation is over a major part of the element width, provided with a convex curvature for contacting the carrier inner contact face.
- 9. Belt according to claim 8, characterised in that the radius of curvature at the elements cross centre corresponds to, but is smaller, at least slightly smaller than the smallest radius of curvature allowed for the belt.
- 10. Belt according to claim 8, characterised in that the curvature extends entirely over said element contact face as seen in side elevation.
- 11. Belt according to claim 8, characterised in that the curvature is defined by, at least substantially corresponds to the shape of a half ellipse, the corresponding ellipse being defined by the mathematical formula for an ellipse, in which, the ellipse largest width corresponds to the elements width, while the local radius of curvature at the ellipse largest height is smaller, preferably slightly smaller than the smallest specified radius of curvature of the belt.
- 12. Belt according to claim 8, characterised in that the maximum height of the saddle is smaller than 0.025 mm.
- 13. Belt according to claim 1, wherein the metal bands have a predetermined surface profiling, and the roughness value of the surface profiling ranges between 0.30 and 0.75 μm Ra.
- 14. Belt according to claim 13, characterised in that the surface profiling is realised by grooves disposed in crossing sets.
- 15. Belt according to claim 1, characterised in that the rocking edge of a transverse element is set more than 1 mm below the saddle surface.
- 16. Belt according to claim 14, characterised in that the rocking edge is located in a range between 1.25 and 2 mm below the saddle surface.
- 17. Transmission provided with a belt according to claim 1, in which the belt operates under lubricated conditions provided by a lubricating oil, characterised in that the lubricating oil has a dynamic viscosity 77 larger or equal to 7 MPa*s, at a nominal temperature of 100 degrees Celsius.
- 18. Transmission provided with a belt according to claim 1, in which the belt operates under lubricated conditions provided by a lubricating oil, characterised in that the lubricating oil has a dynamic viscosity 77 larger or equal to 8 MPa*s, at a nominal temperature of 100 degrees Celsius.
Priority Claims (1)
Number |
Date |
Country |
Kind |
00204817.1 |
Dec 2000 |
EP |
|
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a division of co-pending application Ser. No. 10/028,427, filed on Dec. 28, 2001, the entire contents of which are hereby incorporated by reference
Divisions (1)
|
Number |
Date |
Country |
Parent |
10028427 |
Dec 2001 |
US |
Child |
10737790 |
Dec 2003 |
US |