Belt for continuously variable transmission and manufacturing method of the same

Abstract

A belt for a continuously variable transmission (CVT) including an endless body and a plurality of V blocks attached to the endless body. The V blocks include a plurality of types of blocks having different thicknesses and are divided into a plurality of V block groups. The V block groups have different ratios of the plurality of types of V blocks, to provide a belt whose noise level is low and dispersed.

Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] Apparatuses and methods consistent with the present invention relate to a belt for a continuously variable transmission which is wound across a primary pulley and a secondary pulley each composed of a pair of sheaves and, more specifically, to a belt for a continuously variable transmission whose noise is reduced by using V blocks having different thickness for the large number of V blocks that abut against the pulleys.

[0003] 2. Description of Related Art

[0004] A belt type continuously variable transmission (hereinafter abbreviated as CVT) is generally used for power transmission systems of cars and the like. Belts for the CVTs typically include V blocks that are continuously attached to an endless body. In terms of the endless body, there is a push-type endless body that uses a ring composed of a plurality of laminated metal plates that transmits power by exerting a compression force on the V blocks, and a pull-t...

Examples

Embodiment Construction

[0037] Exemplary modes for carrying out the invention will be explained below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a part of a CVT belt and FIGS. 2A and 2B show a V block (element). The belt 1 is composed of a ring 2 in which a plurality of endless metal sheets are laminated and a large number of V blocks (elements) 3 are successively and endlessly attached to the ring 2. As shown in FIG. 2, in detail, the V block 3 is a plate made of steel, for example, and has a certain thickness. The V block has a body 5 with V-shaped right and left flanks a that abut against pulleys, and a head 7 linked with the body 5 via a pillar 6. A part between the body 5 and the head 7 on the right and left sides of the pillar 6 is a saddle 9 for receiving the ring 2. Channels b for flowing lubricant oil are formed on the right and left flanks a, and the head 7 is provided with a dimple d on one face thereof and with a hole e on the other face to maintain the at...

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] Apparatuses and methods consistent with the present invention relate to a belt for a continuously variable transmission which is wound across a primary pulley and a secondary pulley each composed of a pair of sheaves and, more specifically, to a belt for a continuously variable transmission whose noise is reduced by using V blocks having different thickness for the large number of V blocks that abut against the pulleys.

[0003] 2. Description of Related Art

[0004] A belt type continuously variable transmission (hereinafter abbreviated as CVT) is generally used for power transmission systems of cars and the like. Belts for the CVTs typically include V blocks that are continuously attached to an endless body. In terms of the endless body, there is a push-type endless body that uses a ring composed of a plurality of laminated metal plates that transmits power by exerting a compression force on the V blocks, and a pull-t...

Examples

Embodiment Construction

[0037] Exemplary modes for carrying out the invention will be explained below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a part of a CVT belt and FIGS. 2A and 2B show a V block (element). The belt 1 is composed of a ring 2 in which a plurality of endless metal sheets are laminated and a large number of V blocks (elements) 3 are successively and endlessly attached to the ring 2. As shown in FIG. 2, in detail, the V block 3 is a plate made of steel, for example, and has a certain thickness. The V block has a body 5 with V-shaped right and left flanks a that abut against pulleys, and a head 7 linked with the body 5 via a pillar 6. A part between the body 5 and the head 7 on the right and left sides of the pillar 6 is a saddle 9 for receiving the ring 2. Channels b for flowing lubricant oil are formed on the right and left flanks a, and the head 7 is provided with a dimple d on one face thereof and with a hole e on the other face to maintain the at...

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