Shock Absorber Valve Detent Adjustment for Precise Damping
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Solution Overview
Problem
Conventional valve adjustment devices for shock absorbers face challenges in accurately adjusting damping force due to dimensional errors, leading to excessive rotation and incorrect positioning of the adjuster, resulting in an increased number of clicks and inability to achieve the desired damping force.
Innovation Solution
A valve adjustment device with a shaft having a multiple-threaded screw portion, a ball biased by a spring, and a notch case with detent grooves of varying lengths, allowing for precise adjustment of damping force within a single rotation and preventing excessive rotation through a detent mechanism, enabling the user to easily set the desired damping force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the adjuster is allowed to rotate freely to adjust damping force, then the damping force can be adjusted across the full range, but dimensional errors cause excessive rotation and incorrect positioning
Solution Approach 1:
The detent mechanism divides the continuous rotation range into discrete positioning points (detent grooves), segmenting the adjustment process into controlled steps. This prevents excessive rotation by limiting the adjuster to specific predetermined positions, thereby resolving the contradiction between full adjustment range and positioning accuracy caused by dimensional errors.
Solution Approach 2:
The spring constant of the spring in the detent mechanism is carefully selected to compensate for dimensional errors. By adjusting the spring parameter (constant), the system maintains accurate positioning even when manufacturing tolerances cause variations in component dimensions, thus resolving the contradiction between operation range and positioning precision.
2Measurement precision
If multiple detent grooves are provided for precise positioning, then the damping force can be set accurately, but the interval between grooves becomes narrow making adjustment difficult
Solution Approach 1:
The detent grooves are designed with non-uniform spacing - narrower intervals where precise positioning is needed and wider intervals where coarse adjustment is sufficient. This local variation in groove spacing optimizes both positioning precision and ease of operation, allowing users to easily navigate between settings while achieving accurate damping force adjustment.
3Reliability
If the ball is biased strongly by the spring for firm detent engagement, then the positioning is stable, but the user cannot rotate the adjuster smoothly
Solution Approach 1:
The detent mechanism is designed to be dynamic rather than static - the ball can easily enter and exit detent grooves during rotation, providing stable positioning when engaged but allowing smooth transitions between positions. The spring force is calibrated to maintain reliable engagement while permitting effortless rotation, resolving the contradiction between stability and operability.
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
The solution allows for precise adjustment of damping force, reducing user burden and ensuring the desired damping force is achieved, even with dimensional errors, by limiting the number of clicks and optimizing the resistance change.
Implementation Method 1
a spring received in the hole and biasing the ball outward from the hole
Implementation Method 2
a shaft having a multiple-threaded screw portion on an outer periphery, the shaft being displaceable in an axial direction by rotation in a peripheral direction
Data Source
AI summary
A valve adjustment device according to the present invention includes: a shaft having a screw portion on an outer periphery, the shaft being displaceable in an axial direction by rotation in a peripheral direction, the shaft applying displacement to a valve that changes resistance applied to a flow of hydraulic oil (fluid) by transmission of the displacement; a ball received in a hole opening in a radial direction from a side of the shaft; a spring received in the hole and biasing the ball outward from the hole; and a notch case that has a tubular shape, into which the shaft is inserted, and that has a plurality of detent grooves that is provided along the axial direction on an inner periphery to receive the ball fitted thereinto. At least one of the detent grooves is shorter than the other detent grooves.