Frequency Sensitive Shock Absorber Spool Valve Design
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Solution Overview
Problem
Conventional frequency sensitive type shock absorbers are costly, complex, and inefficient due to their large number of parts and complicated structures, which hinder ride comfort adjustments based on road surface conditions and vehicle posture, leading to noise and durability issues.
Innovation Solution
A frequency sensitive type shock absorber with a simplified structure featuring a cylinder, piston valve, spool, and elastic members that adjust damping force by partitioning the chamber into upper and lower sections, using a spool that elevates with fluid flow to control fluid passage and generate varying damping forces based on frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a slidable free piston and caulking spring are used to absorb fluid and open/close passage, then frequency sensitive damping performance is achieved, but the structure becomes complicated and costs increase
Solution Approach 1:
The invention extracts and eliminates the complex slidable free piston and caulking spring mechanism from the shock absorber. Instead, it uses a simplified spool valve structure with fluid pressure-driven operation to achieve the same frequency-sensitive damping function without the complicated moving parts and passage opening/closing mechanisms.
Solution Approach 2:
The invention merges the functions of fluid absorption, passage control, and damping adjustment into a single integrated spool valve structure. The spool valve combines the fluid flow control and damping adjustment functions that were previously separated into multiple components (free piston, caulking spring, passage mechanisms), thereby simplifying the overall structure.
2Reliability
If a slidable free piston is used to absorb fluid, then damping performance is improved, but a long stroke is required and noise is generated by contact
Solution Approach 1:
The invention replaces the mechanical contact-based slidable free piston system with a fluid pressure-driven spool valve system. Instead of relying on mechanical sliding contact and large-stroke movement, the spool valve uses fluid pressure differentials to control damping, eliminating the noise and wear associated with mechanical contact while maintaining effective damping performance.
3Stability of the object's composition
If damping force characteristic is increased to maintain vehicle posture, then posture stability is improved, but ride comfort is deteriorated
Solution Approach 1:
The invention implements dynamic damping force adjustment through the spool valve structure. The spool valve responds to fluid pressure changes caused by different road conditions and vehicle movements, automatically adjusting the damping force characteristic in real-time. This allows the shock absorber to provide high damping force for posture stability when needed while switching to lower damping force for ride comfort during normal operation, achieving both objectives dynamically rather than statically.
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 reduces costs and simplifies the design of basic components, allowing for effective damping force adjustment according to road conditions and vehicle posture, minimizing noise and improving durability while maintaining ride comfort.
Implementation Method 1
a spool which is formed within the chamber part and is elevated by a fluid flowing into the chamber part
Implementation Method 2
a pair of elastic members which are formed in the upper chamber and the lower chamber to prevent a fluid from penetrating between the pair of the partition members and the side of the chamber part, and assist a restoration of the partition members by elasticity
Implementation Method 3
a guide member which is formed between the pair of the partition members, has a elastic force, and guides the pair of the partition members to maintain a position thereof
Data Source
AI summary
A frequency sensitive type shock absorber is provided. A housing has a bypass hole formed such that an upper portion of a chamber part is opened to connect to the opening, and a lower portion of the chamber part communicates with the compression chamber. A spool is formed within the chamber part and is elevated by a fluid flowing into the chamber part. A pair of partition members partitions the chamber part into upper and lower chambers and provides a restoring force to the spool. A guide member is formed between the pair of the partition members, has a elastic force, and guides the partition members to maintain positions thereof. A pair of elastic members is formed in the upper and lower chambers to prevent a fluid from penetrating between the pair of the partition members and the side of the chamber part, and assist a restoration of the partition members by elasticity.