Rebound Spring Collar Structure to Prevent Twist Deformation
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Solution Overview
Problem
The existing rebound spring structures in hydraulic shock absorbers are prone to plastic deformation due to relative rotation between the piston rod and cylinder during maximum contraction, leading to potential damage and inefficiency in shock absorption.
Innovation Solution
A rebound spring structure featuring a one-side holding member fixed to the piston rod and an other-side holding member with a facilitating part that allows movement in the circumferential direction, preventing relative rotation and twist between the ends of the spring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rebound spring is fixed at one end during maximum contraction, then the shock absorption function is maintained, but relative rotation between the piston rod and cylinder causes the spring ends to rotate and twist, leading to plastic deformation
Solution Approach 1:
The holding member is designed with a facilitating part that enables dynamic circumferential movement relative to the rod, allowing the structure to adapt to rotational movements during shock absorption while maintaining axial positioning. This dynamic capability prevents the spring from twisting and deforming plastically.
Solution Approach 2:
The facilitating part acts as an intermediary element between the holding member and the rod, enabling controlled circumferential movement. This intermediary mechanism allows the holding member to follow rotational movements without transmitting excessive stress to the spring, thereby preventing plastic deformation.
2Reliability
If the holding member is fixed rigidly to prevent rotation, then plastic deformation is prevented, but the structure becomes more complex and may interfere with normal shock absorption movement
Solution Approach 1:
The holding member is segmented into distinct functional parts: a positioning part that maintains axial position and a facilitating part that enables circumferential movement. This segmentation allows each part to perform its specific function independently, preventing plastic deformation while maintaining structural simplicity.
Solution Approach 2:
Different parts of the holding member have different properties: the positioning part provides rigid constraint in the axial direction, while the facilitating part provides freedom of movement in the circumferential direction. This local differentiation of constraints allows the structure to prevent deformation without unnecessary complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively prevents plastic deformation of the rebound spring, ensuring consistent performance and reducing the risk of damage to the shock absorber components, thereby enhancing the durability and efficiency of the hydraulic shock absorber.
Implementation Method 1
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.
Data Source
AI summary
The rebound spring structure includes: a rebound spring; a lower rebound collar configured to hold an end on one side of the rebound spring; and an upper rebound collar configured to hold an end on the other side of the rebound spring, the rebound spring structure being positioned around a rod configured to move relative to a cylinder. The lower rebound collar is held by a piston rod. The upper rebound collar is movably fitted to the piston rod. The upper rebound collar includes a recess on an upper disk part configured to restrict movement of the rebound spring to the other side, the recess being configured to facilitate movement of the upper rebound collar in a circumferential direction of the piston rod.