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弦轴在受琴弦张力作用的情况下,有倾斜和转动的趋势。保持弦轴处于平衡状态的外力来自木圈和弦轴板。克服弦轴转动的摩擦阻力矩主要决定于弦轴与弦轴板间的挤压力和摩擦系数。本文对此不展开讨论。克服弦轴倾斜的支承力来自木圈和弦轴板。本文以上海钢琴公司立式钢琴为例就此作一些简要分析。
Under the action of string tension, the string axis tends to tilt and rotate. External forces that keep the pegs in balance are from the wood chord pegs. The frictional resistance moment to overcome the rotation of the peg depends mainly on the squeezing force and the friction coefficient between the peg and the pegboard. This article does not discuss this. The supporting force to overcome tilting of the pegs comes from the wood chord shaft plate. In this paper, the Shanghai Piano Company vertical piano as an example to make some brief analysis.