Shock Absorber Seamless Choke Passage Design
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Solution Overview
Problem
Existing shock absorbers face challenges in generating a desirable damping force due to fluid leakage and deformation issues in the choke passage, requiring stringent dimensional tolerances and complex manufacturing techniques.
Innovation Solution
The shock absorber incorporates a seamless choke passage formed by penetrating a choke portion, which allows communication between fluid chambers and generates damping force at low piston speeds, with the choke passage designed in a spiral pattern to provide resistance and avoid clogging, and manufactured using additive technology for enhanced versatility and ease of production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the inner diameter of the case member is made large compared with the outer diameter of the choke member, then the assembly is easier to manufacture, but the working fluid leaks from the choke groove
Solution Approach 1:
A sealing member is introduced as an intermediary component between the case member and the choke member. This sealing member fills the gap between the two components, preventing working fluid from leaking through the choke groove while allowing the case member's inner diameter to remain sufficiently large for easy assembly. The sealing member acts as a mediator that resolves the conflict between assembly ease and fluid sealing reliability.
2Reliability
If the inner diameter of the case member is made small compared with the outer diameter of the choke member, then fluid sealing is improved, but the choke groove deforms during insertion
Solution Approach 1:
The sealing member serves as a buffer between the case member and the choke member, allowing the case member's inner diameter to be small enough for good fluid sealing while preventing direct contact and deformation between the components during assembly. The sealing member absorbs the mechanical stress that would otherwise deform the choke groove.
3Reliability
If stringent dimensional tolerances are controlled for both case member and choke member, then fluid leakage is prevented, but manufacturing complexity increases
Solution Approach 1:
The sealing function is segmented from the case member and choke member themselves, and assigned to a separate sealing member. This segmentation allows the case member and choke member to have relaxed dimensional tolerances for easier manufacturing, while the sealing member specifically handles the fluid sealing requirement. The sealing member is a dedicated component whose sole function is to prevent fluid leakage.
Solution Approach 2:
The sealing member acts as an intermediary that takes over the fluid sealing function, allowing the case member and choke member to be manufactured with standard tolerances. Instead of requiring both components to have stringent tolerances, the sealing member mediates the sealing requirement, simplifying the manufacturing process while maintaining reliable fluid sealing.
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 configuration simplifies manufacturing by controlling only the choke portion's dimensional tolerances, enables a larger damping force in a smaller size, and allows for easy replacement and integration with other components, ensuring facilitated production and enhanced performance.
Implementation Method 1
a choke portion formed by penetration of a seamless choke passage, the seamless choke passage being configured to allow the first fluid chamber to communicate with the second fluid chamber
Data Source
AI summary
A shock absorber includes a cylinder in which a working fluid is sealed, a piston rod movable into and out of the cylinder, the piston rod extending from the cylinder, a piston disposed inside the cylinder, the piston being configured to partition a first fluid chamber and a second fluid chamber, and a choke portion formed by penetration of a seamless choke passage, the seamless choke passage being configured to allow the first fluid chamber to communicate with the second fluid chamber.