| 摘要 |
PURPOSE:To reduce the fatigue of a leaf spring by providing a couple of energizing springs which energize an arm toward a carriage between the arm and carriage symmetrically at both sides of a center axis in the lengthwise direction of the arm. CONSTITUTION:When pressing-up force F operates on the knob 20 of the arm 17 during unloading, F1 operates on the operation point P1 of an energizing spring 19 far from the operation point P of the pressing-up force F and F2 operates on the operation point P2 of a near energizing spring 19'. When the arm 17 slants by some angle in a rolling direction, there is a difference (d) between the forces F1 and F2, so angular moment is generated on the arm 17 around the center axis C in the rolling direction. This angular moment is therefore canceled by the angular moment of the force F pressing up the arm 17, so the arm 17 does not roll and neither bending moment nor torsional moment is generated on the leaf spring 16. Consequently, the generation of bending moment and torsional moment operating on the leaf spring 16 is reduced to prevent the accumulation of the fatigue of the leaf spring 16. |
