Collision stopper for suspension apparatus

Abstract

To provide a foamed polyurethane bound stopper for a suspension device, having no unpleasant abnormal sounds due to friction against a spring seat during stopper operation. The foamed polyurethane bound stopper 46 elastically abuts on a cylinder during bound to restrict the excessive contractive displacement of a shock absorber. Between a large-diameter fitting portion 60 at the upper end and an annular constriction portion 48 for giving axial compressive deformation capability thereto on the outer peripheral face of an insertion portion 80 which is in the condition of being inserted into a recessed fitting portion 44 of the spring seat 42 under the condition of compressive deformation during the bound of a vehicle, a diameter shrinking guide portion 82 is provided in the form of an approximately inverted taper with its outer diameter gradually smaller toward the upper side for guiding diameter shrinking deformation with the compressive deformation. An annular gap is formed in at least the insertion portion 80 between an inner peripheral face 72 of a center hole 47 and the piston rod to provide for diameter shrinking deformation.

Description

Technical field [0001] The present invention relates to a cylindrical foamed polyurethane impact stopper (boundstopper) used in a vehicle suspension device including a shock absorber and a coil spring as a structural element, and in particular to a bound stopper characterized by being used for preventing abnormalities. Shock limiter for sound technical means. Background technique [0002] Conventionally, in vehicle suspension devices that include shock absorbers and coil springs as structural elements, they are used to contact the cylinder of the shock absorber when the vehicle jumps to control the shock limit of excessive contraction and displacement of the shock absorber. Positioner. [0003] For example, the following Patent Document 1 describes an impact stopper. [0004] The impact limiter has an impact limiter made of rubber and an impact limiter made of foamed polyurethane. In particular, when the impact stopper is made of the latter foamed polyurethane, it has the charact...

AI Technical Summary

Problems solved by technology

[0009] The spring seat is an important protective part on the vehicle. Because it requires rust resistance, cationic coating is applied on the surface, and the surface becomes a "smooth" smooth surface. Therefore, the impact stopper acts as a stopper. During compression and deformation, friction occurs against the spring seat, specifically, against the inner peripheral surface of the inverted cup-shaped concave fitting portion, so there is a problem that abnormal sound consisting of stick slip sound is likely to be generated.

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