To suppress a spring constant developed by a leaf spring device low at first, and then to increase the same when warp deformation of a leaf spring body progresses while suppressing weight and costs in a process where the leaf spring body warps upward and is deformed.SOLUTION: A leaf spring device includes: a leaf spring body 11; a first spring eye 12 and a second spring eye 13; and a connection piece 14. The first spring eye is connected to a vehicle body B1 so that it can rotate around a first shaft line O1 extending in a width direction Y of the leaf spring body. The second spring eye is connected to the connection piece so that it can rotate around a second shaft line O2 extending in the width direction. A center part area in the longitudinal direction X in the leaf spring body supports an axle. The leaf spring body is provided so that it can warp upward and is deformed. In the process that the leaf spring body warps upward and is deformed, a connection part 11a to the second spring eye in the leaf spring body is energized by an elastic restoration force of the connection piece in the direction x1 displaced in a longitudinal direction.SELECTED DRAWING: Figure 1
【課題】板ばね本体が上方に向けて撓み変形する過程において、板ばね装置が発現するばね定数を、当初は低く抑え、その後、板ばね本体の撓み変形が進行したときには高くすることを、重量およびコスト等を抑えつつ実現する。【解決手段】板ばね本体11と、第1目玉部12および第2目玉部13と、連結片14と、を備え、第1目玉部は、車体B1に、板ばね本体の幅方向Yに延びる第1軸線O1回りに回転可能に連結され、第2目玉部は、連結片に、幅方向に延びる第2軸線O2回りに回転可能に連結され、板ばね本体における長手方向Xの中央部領域が車軸を支持し、板ばね本体は、上方に向けて撓み変形可能に設けられ、板ばね本体が上方に向けて撓み変形する過程において、板ばね本体における第2目玉部との接続部分11aが、当初、長手方向に変位する向きx1に、前記接続部分が、連結片の弾性復元力により付勢されている。【選択図】図1
LEAF SPRING DEVICE
板ばね装置
2023-05-23
Patent
Electronic Resource
Japanese
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