摘要
已经用试验实测了稳定工况下推块的压缩力和环的拉力。在以前的工作中已经概要地说明了这种带型的特殊的传动机理。本文采用最近开发设计的推块测量在稳定工况下其他同时作用于推块上的力 ,这些力是推块和环之间的摩擦力 ,推块和带轮间的法向力 ,推块和带轮之间径向和切向摩擦力。根据新的试验数据来详细叙述金属推块 V-带型 CVT的传动机理。本文着重提出以下结论。( 1 )在所有工况 ,推块和环结合的结合点在带轮上具有一个较大的节径 ,它与速比和传递转矩无关 ,在较小带轮上所有推块转速快于环 ,这决定着环的拉力。( 2 )由于推块挤入从动带轮槽内 ,故产生推块压缩力的一次增加现象。( 3)因作用于推块侧面的法向力变大 ,故推块在大带轮的出口处径向摩擦力变成极大。
Block compression force and ring tension of a metal pushing V belt type CVT have been experimentally measured at steady states. The peculiar transmitting mechanisms for this type of belts has also been outlined based on the experimental results in the previous works. In this paper, other forces simultaneously acting on a block at steady states were measured using newly developed devised blocks. These forces are frictional force between blocks and rings, normal force between blocks and pulleys, frictional forces between blocks and pulleys in radial and tangential directions. The transmitting mechanisms for the metal pushing V belt type CVT were drawn in detail based on new experimental data. The following conclusions are emphasized in the present work. (1) A cohesive point where the block coheres with the ring exists in the pulley having a larger pitch radius at all conditions. This is not dependent on speed ratio and trasmitting torque. The all blocks run faster than rings in the smaller pulley. This fact governs the ring tension. (2) The phenomenon that the block compression force once increases in the driven pulley is due to penetration of blocks into the pulley groove. (3) The radial frictional force becomes extremely large at the exit of the larger pulley since the normal force acting on the side surface of the block becomes large there.
出处
《传动技术》
2000年第3期27-35,5,共10页
Drive System Technique
