To suppress deviation of sliding torque from a design value due to a manufacturing error and variations in sliding torque caused by aging.SOLUTION: A pivot comprises a spring 76 for applying a spring load W to a clearance between a recessed spherical face 60 and a protrusive spherical face 42 to apply a pressing force between abutment faces of the two spherical faces. Both the spherical faces are arranged such that they can turn relative to each other in a direction about a virtual linear line 16 that passes through a center 14 of a virtual spherical body defining a virtual spherical face to which both the spherical faces belong and that extends in a direction of the spring load and such that they can incline relative to each other in a direction around a center of the virtual spherical body. With a point at which the virtual linear line intersects with the virtual spherical face being defined as a pole position 18-1, the abutment faces 62 of the spherical faces are arranged in a specific latitude range of the virtual spherical face. The spherical face of the two spherical faces that is located on a side at which the spherical face is inclined with the virtual linear line during inclination has a protruding face 60 which protrudes in a radial direction and which partitions the specific latitude range from the outside of the specific latitude range. The two spherical faces abut on each other on the protruding face 60.SELECTED DRAWING: Figure 1A
【課題】製造誤差による摺動トルクの設計値からのずれや経年変化による摺動トルクの変動を抑制する。【解決手段】ピボットは、凹球面60と凸球面42の間にスプリング荷重Wを印加して両球面の相互の当接面間に押圧力を付与するスプリング76を具える。両球面は、該両球面が属する仮想球面を構成する仮想球体の中心14を通りかつスプリング荷重の方向に延びる仮想直線16の周り方向に相互に回動可能にかつ該仮想球体の中心の周り方向に相互に傾動可能に配置されている。仮想直線が仮想球面と交差する点を極位置18-1として、両球面の相互の当接面62は仮想球面の特定の緯度範囲に配置されている。両球面のうち傾動の際に仮想直線を伴って傾動する側の球面は、該特定の緯度範囲を該特定の緯度範囲の範囲外から区画する径方向に突出した突出面60を有する。両球面は突出面60で相互に当接する。【選択図】図1A
PIVOT STRUCTURE
ピボット構造
2022-12-22
Patent
Elektronische Ressource
Japanisch