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Belt for continuously variable transmission

Imported: 24 Feb '17 | Published: 06 Jan '04

Toru Yagasaki, Shigeru Kanehara

USPTO - Utility Patents

Abstract

In a belt for a continuously variable transmission, the relationship of NH<Y is established between the following two angles: (i) an angle Y formed between a straight line drawn from a lower end of one of left and right pulley-abutment faces of a metal element to an outer end of the other of the left and right lower ear surfaces and a straight line drawn from a point of the intersection of a straight line drawn downwards from the point with an outer peripheral surface of a metal ring assembly to the point; and (ii) an angle NH formed between a tangent line drawn from the point onto a projection and a tangent line drawn from the point onto a recess of the metal element.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1 to

9 show an embodiment of the present invention, wherein

FIG. 1 is a skeleton diagram of a power transmitting system of a vehicle provided with a continuously variable transmission;

FIG. 2 is a perspective view of a portion of a metal belt;

FIG. 3 is a front view of a metal element;

FIG. 4 is an enlarged view of a portion indicated by

4 in FIG. 3;

FIG. 5 is a view taken in a direction of an arrow

5 in FIG. 3;

FIG. 6 is a diagrammatic illustration of the metal belt reeved around a drive pulley and a driven pulley;

FIGS. 7A to

7D are operation-explaining diagrams showing the behavior of a metal ring assembly;

FIG. 8 is a graph showing a region in which Y>NH is established; and

FIG. 9 is a graph showing a region in which CLY>(LY

2/LNH×LYH)×CLNH is established.

Claims

1. A belt for a continuously variable transmission having a drive pulley and a driven pulley, the belt comprising

2. A belt for a continuously variable transmission according to claim 1, wherein the relationship of NH<Y is established between the following two angles: (i) an angle Y formed between a straight line drawn from said lower end of the one pulley-abutment face of the one metal element to a laterally outer end of the other of the left and right lower ear surfaces thereof and a straight line drawn from a point of intersection of a straight line drawn down radially inwards from the laterally outer end of the other lower ear surface with the outer peripheral surface of the metal ring assembly to the lower end of the one pulley-abutment face; and (ii) an angle NH formed between a tangent line drawn from the lower end of the one pulley-abutment face of the metal element onto an outer peripheral surface of the projection and a tangent line drawn from the lower end of the one pulley-abutment face of the metal element onto an inner peripheral surface of said recess.

3. A belt for a continuously variable transmission having a drive pulley and a driven pulley, the belt comprising

4. A belt for a continuously variable transmission according to any one of claims 1 to 3, wherein the at least one ring slot is a pair of the left and right ring slots and wherein the at least one ring assembly is a pair of left and right ring assemblies, whereby the metal elements are supported on the pair of the left and right metal ring assemblies, respectively.

5. A belt for a continuously variable transmission according to any one of claims 1 to 3, wherein the projection and the recess of each metal element are located on a centerline of the metal element.