Components for metal belts of continuously variable transmissions

Abstract

The invention provides a component for a metal belt of a continuously variable transmission, and can appropriately reduce the stress generated at a neck root portion of the component to enhance the repeated fatigue strength when the metal belt is driven, thereby enhancing the torque transmission capacity of the continuously variable transmission and the power transmission efficiency of the continuously variable transmission in the vicinity of an overrunning ratio region. A steel material having a carbon content of 0.61% or more and 0.71% or less is used as a steel material for the component to produce the component. At this time, the shape of the neck root portion connecting a saddle shape surface and a neck side surface is formed by three curved surfaces connected in a smooth manner to each other and satisfying the relationship of R1 < R2 < R3 and D / R2 < / = 0.3, and the three curved surfaces are a downwardly convex curved surface (PA-PB (R1)), a downwardly convex curved (PB-PD (R2)) and an upwardly convex curved surface (PD-PE (R3)). In addition, each of the connecting portions is smoothly connected to share the curved surfaces adjacent to the same tangent plane (tangent line).

Description

technical field [0001] The present invention relates to an element for a metal belt of a continuously variable transmission, and more specifically relates to an element for a metal belt of a continuously variable transmission that can properly reduce the stress generated at the root of the neck of the element when the metal belt is driven and improve the repeated fatigue strength , so that the torque transmission capacity of the continuously variable transmission can be improved, and the power transmission efficiency of the continuously variable transmission near the overdrive ratio region can be improved. Background technique [0002] As elements for metal belts of continuously variable transmissions, such as Figure 8 As shown, it has: an element body of an approximately trapezoidal element; a neck with a pair of left and right annular seams in the middle for fitting a metal ring assembly; and an approximately triangular-shaped ear formed on the upper part of the body throu...

AI Technical Summary

Problems solved by technology

[0018] However, according to Figure 10 (c) and Figure 11 It can be seen from (c) that when 0.3≤D / R≤0.75, a very high stress will be generated at the root of the neck

Therefore, the above-mentioned Patent Document 3 does not necessarily have a great effect on reducing the stress at the base of the neck.

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