shock absorber

The shock absorber's damping force generating valve with stacked leaves and notches addresses the issue of discontinuous damping force, improving riding comfort by smoothing the damping force rise and allowing tunable settings.

JP2026100275APending Publication Date: 2026-06-19TOYOTA JIDOSHA KK
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
TOYOTA JIDOSHA KK
Filing Date
2024-12-09
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

The end face of a leaf valve in a shock absorber does not open until it lifts by the thickness of the leaf valve, leading to rapid changes in fluid flow rate and discontinuous damping force in the very low speed range, causing high-frequency vibrations and deteriorating riding comfort.

Method used

A shock absorber with a damping force generating valve featuring an annular leaf valve that allows deflection in both axial directions, comprising stacked leaves with notches at their free ends, and an opposing portion with a gap, to manage damping force characteristics smoothly across varying piston speeds.

Benefits of technology

The solution improves the damping force rise characteristics, reducing high-frequency vibrations and enhancing riding comfort by ensuring a smoother increase in damping force with piston speed, while allowing tunable damping force settings for both extension and compression strokes.

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Abstract

This technology provides an improvement in the damping force rise characteristics of the leaf valve in a shock absorber. [Solution] In the shock absorber, the piston is fitted to the inner wall of the cylinder so as to be reciprocable. The piston has a damping force generating valve 24 that generates a damping force according to the piston speed. The annular leaf valve 54 allows deflection on both sides in the axial direction of the piston, with one of its outer and inner circumferences being a free end 55. The annular opposing portion 52 is provided with a gap G1 between it and the free end 55 of the leaf valve 54. The leaf valve 54 has a first leaf 2a, a second leaf 2b stacked on one side in the axial direction of the first leaf 2a, and a third leaf 2c stacked on the other side in the axial direction of the first leaf 2a. The second leaf 2b and the third leaf 2c each have notches 4b and 4c at the free end 55.
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