Shock Absorber Reverse Thread Structure for Oil Seal Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing shock absorbers for vehicles, such as those used in motorcycles, face challenges in maintaining oil sealing performance when the spring load adjustment procedure deviates from the expected method, particularly in emergency situations where dedicated tools are not available, leading to potential loosening of the damper tube with respect to the damper head.
Innovation Solution
The shock absorber design incorporates a first male screw and a second male screw with a reverse screw configuration on the damper tube, allowing for secure tightening and preventing loosening even when excessive force is applied, thereby enhancing oil sealing performance between the damper head and the damper tube.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single male screw is used on the damper tube for both spring load adjustment and damper head attachment, then the device complexity is reduced, but the reliability of oil sealing deteriorates when excessive tightening force is applied
Solution Approach 1:
The single male screw is segmented into two separate male screws: a first male screw for spring load adjustment and a second male screw for damper head attachment. This segmentation allows independent optimization of each screw's function, preventing interference between adjustment and tightening operations while maintaining overall system simplicity
Solution Approach 2:
The damper tube acts as an intermediary element with dual screw configurations that mediates between the spring load adjustment mechanism and the damper head attachment mechanism, allowing both functions to operate independently without compromising oil sealing reliability
2Volume of moving object
If the damper tube and damper head are constructed as separate members, then the size of the shock absorber is reduced, but the risk of loosening increases when non-dedicated tools are used for adjustment
Solution Approach 1:
The shock absorber is segmented into separate damper tube and damper head members connected by screwed joints, enabling reduced overall size while maintaining connection stability through properly designed threaded interfaces that resist loosening under various tightening conditions
Data Source
AI summary
A shock absorber includes: a damper tube accommodating a piston in a reciprocally movable manner; a suspension spring for urging the damper tube and a piston rod in opposite directions; a first male screw provided on an outer peripheral surface of the damper tube; a first nut screwed into the first male screw so as to enable a spring load of the suspension spring to be adjusted; a second nut screwed into the first male screw so as to enable a position of the first nut in an axial direction of the damper tube to be fixed; a second male screw having a reverse screw configuration to the first male screw and provided on the outer peripheral surface of the damper tube; and a damper head screwed into the second male screw so as to enable the damper head to cover one end portion of the damper tube.