Position detecting device for hydraulic cylinder, and industrial vehicle equipped with the position detecting device

摘要

An anti-resonance member (40) is provided on an inner wall of a cylinder tube (12) of a lift cylinder (10). The anti-resonance member (40) is formed into a cylindrical form, and an outer circumferential surface (40a) thereof is formed along an inner circumferential surface of the cylinder tube (12). The anti-resonance member (40) is formed by coating resin high in ultrasonic wave attenuating effect (such as polyphenylene sulfide (PPS) resin). It is possible to attenuate or absorb resonance of a surface wave transmitted from an ultrasonic wave sensor (20) and indirectly transmitted through the inner wall of the cylinder tube.