Endless belt power transmission systems or components – Friction drive belt – Including fabric web
Reexamination Certificate
2001-01-20
2003-05-06
Bucci, David A. (Department: 3682)
Endless belt power transmission systems or components
Friction drive belt
Including fabric web
Reexamination Certificate
active
06558282
ABSTRACT:
FIELD OF THE INVENTION
This invention is directed to power transmission belts. Specifically, the invention is a v-ribbed belt, wherein the v-ribbed belt has continuously extending longitudinal ribs or discontinuous ribs extending the length of the belt.
BACKGROUND OF THE INVENTION
In a conventional power transmission belt, the belt has an inner compression section, an outer tension section, and an intermediate neutral plane. Typically, helically wound reinforcing cords are located within the neutral plane and so the neutral plane is also referred to as the load carrying zone.
There are two different types of v-ribbed belts. The first is the banded poly-v belt. In a banded poly-v belt, a band of material secures multiple v-belts to each other. Methods of manufacturing the banded poly-v belt may include forming a plurality of v-belts and then applying the band of material which secures them or forming a large belting material with the helically wound reinforcing cords located off of the central line of the belting material and then cutting grooves in the belting material to form the plurality of extending longitudinal ribs, the depth of the groove extending beyond the location of the reinforcing cords. In banded poly-v belts manufactured by these methods, each v-rib acts independently during operation of the entire belt and each rib has an its own neutral plane. One such banded poly-v belt is disclosed in U.S. Pat. No. 4,177,688.
In the second type of v-ribbed belt, the neutral place of the entire belt is located above the continuous grooves. The v-ribbed belt may be manufactured by either molding the continuous grooves and ribs or by forming a belting material and then cutting the grooves in the belting material. Molded v-ribbed belts are disclosed in U.S. Pat. Nos. 3,818,741, 4,657,526, and 4,892,510. Cut poly v-belts are disclosed in U.S. Pat. Nos. 4,432,744 and 5,674,143.
V-ribbed belts may also be provided with lateral grooves; such lateral grooves extending either traverse to the belt or at an angle relative to the traverse direction of the belt. Such cogged v-ribbed belts are disclosed in U.S. Pat. Nos. 4,002,082 and 5,382,198. By inclining the lateral grooves at an angle relative to the transverse direction, the belt has quieter noise properties than when the grooves extend in the transverse direction.
SUMMARY OF THE INVENTION
The present invention is directed towards an improved power transmission belt wherein the noise generated during slip conditions is greatly reduced.
The disclosed power transmission belt has a compression section, a tension section, and a load carrying section comprising longitudinal reinforcing cords intermediate the compression section and the tension section. The compression section has at least one fabric layer and a plurality of longitudinally extending grooves forming longitudinally extending ribs. The at least one fabric layer is distanced from the outermost surface of the longitudinally extending ribs. The untreated gauge of each fabric layer is in the range of 0.20 to 1.0 mm with a preferred range of 0.25 to 0.75 mm.
In one aspect of the invention, the outermost fabric layer is spaced from the outermost surface of the rib by a distance x that is 5% to 50% of the depth y of the longitudinally extending grooves.
The fabric in the compression section has a thickness gauge t that is 6% to 50% of the depth y of the longitudinally extending grooves. The compression section may have up to five layers of fabric.
Also disclosed is a power transmission belt having a compression section, a tension section, and an intermediate load carrying section. The compression section has at least one fabric layer, a plurality of longitudinally extending grooves, and a plurality of transversely extending grooves. The untreated gauge of each fabric layer is in the range of 0.20 to 1.0 mm, the preferred gauge range is 0.25 to 0.75 mm.
In one aspect of the disclosed belt, the at least one fabric layer is spaced from the outermost surface of the rib by a distance x that is 5% to 50% of the depth y of the longitudinally extending grooves.
Also, the transverse grooves in the power transmission belt are inclined at an angle of 20° to 80° relative to the longitudinal grooves and preferably have a depth less than the depth of the longitudinal grooves.
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Danhauer Loren Elza
Feuereborn Frank Joseph
Bucci David A.
Johnson Vicky A.
Krawczyk Nancy T.
The Goodyear Tire & Rubber Company
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