CROSS-REFERENCE TO RELATED PATENT APPLICATIONS

This application is a U.S. National Phase Application under 35 U.S.C. § 371 of International Patent Application No. PCT/JP2017/001260, filed Jan. 16, 2017, and claims the benefit of Japanese Patent Application No. 2016-213218, filed Oct. 31, 2016, all of which are incorporated herein by reference in their entirety. The International Application was published in Japanese on May 3, 2018 as International Publication No. WO/2018/078896 under PCT Article 21(2).

FIELD OF THE INVENTION

The present invention relates to a rebound spring structure.

BACKGROUND OF THE INVENTION

A rebound spring for absorbing shock during maximum extension of a hydraulic shock absorber has been proposed. For example, Japanese Unexamined Publication No. 2010-038313 discloses a rebound spring including: cylinder, a piston rod movably inserted into the cylinder via a piston, a rod guide mounted to one end of the cylinder and rotatably supporting the piston rod; and a flange provided on an outer periphery of the piston rod. In the shock absorber, the rebound spring is interposed between the rod guide and the flange. The rebound spring includes: a coil spring; an annular flange-side holder provided to a flange-side end of the coil spring and loosely fitted to the outer periphery of the piston rod; and a guide-side holder provided to a rod guide-side end of the coil spring and allowing for insertion of the piston rod. An elastic ring is attached to an inner periphery of the flange-side holder for fitting to the outer periphery of the piston rod, and the flange-side holder is fixed to the outer periphery of the piston rod by tightening force of the elastic ring.

Technical Problem

When one end of the rebound spring is fixed, for example, relative rotation of the piston rod and the cylinder during maximum contraction of the rebound spring may cause the one end and the other end of the rebound spring to rotate relative to each other and twist. This may result in plastic deformation of the rebound spring.

An object of the present invention is to provide a rebound spring structure that prevents plastic deformation of the rebound spring.

SUMMARY OF THE INVENTION

Solution to Problem

With this object in view, the present invention is a rebound spring structure including: a spring; a one-side holding member configured to hold an end on one side of the spring; and an other-side holding member configured to hold an end on the other side of the spring, the rebound spring structure being positioned around a rod configured to move relative to a cylinder, wherein the one-side holding member is held by the rod, the other-side holding member is movably fitted to the rod, and the other-side holding member includes a facilitating part at a flange of the other-side holding member, the flange being configured to restrict movement of the spring to the other side, the facilitating part being configured to facilitate movement of the other-side holding member in a circumferential direction of the rod.

Advantageous Effects of Invention

According to the present invention, it is possible to provide a rebound spring structure that prevents plastic deformation of the rebound spring.

