Shock Absorber Piston Assembly Blow-off Reducing Unit
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Solution Overview
Problem
Conventional shock absorbers experience rapid variations in damping force at the blow-off point during low-speed and middle-speed transitions, leading to reduced ride comfort and passenger discomfort.
Innovation Solution
A piston assembly with a blow-off reducing unit that forms multiple blow-off points through the interaction of the rebound and compression passages and bypass passages, allowing for smooth fluid flow and minimizing pressure loss, thereby controlling damping force effectively in low-speed and middle-speed transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single blow-off point is used to control damping force transition, then the structure is simple, but rapid variation in damping force occurs causing poor ride comfort
Solution Approach 1:
The invention divides the single blow-off point into multiple blow-off points (first blow-off point and second blow-off point) by creating separate flow paths. The first blow-off point is formed by the piston valve and piston body, while the second blow-off point is formed by the auxiliary valve and rebound retainer. This segmentation allows the damping force transition to occur in stages, reducing rapid variations and improving ride comfort.
2Object-affected harmful factors
If multiple blow-off points are generated to reduce blow-off effects, then ride comfort improves, but the device complexity increases
Solution Approach 1:
The invention combines the auxiliary valve with the rebound retainer structure, where the auxiliary valve is integrated into the rebound retainer assembly. The auxiliary mounting sheet is formed on the rebound retainer, and the auxiliary valve works in conjunction with existing components like the second rebound disk sheet. This merging approach creates multiple blow-off points while minimizing additional structural complexity.
3Force
If the main passage is used for fluid flow during rebound and compression, then the damping force control is effective, but pressure loss increases causing harsh transitions
Solution Approach 1:
The invention introduces the auxiliary valve as an intermediary component that creates a secondary flow path through the bypass passage. When the piston valve closes the main passage during transitions, the auxiliary valve opens to allow fluid to flow through the bypass passage, reducing pressure loss and preventing harsh transitions. This intermediary mechanism ensures continuous fluid flow and smooth damping force transitions.
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 significantly reduces rapid variations in damping force, providing a comfortable ride by creating multiple blow-off points that allow for soft and smooth damping force transitions, enhancing ride comfort during low-speed and middle-speed periods.
Implementation Method 1
a blow-off reducing unit provided between the rebound retainer and the auxiliary valve and under the auxiliary valve, and configured to form a plurality of blow-off points by opening and closing a main passage, which is formed by mutual communication between the rebound passage and the second coupling hole during rebound and compression strokes
Data Source
AI summary
A piston assembly of a shock absorber is provided. A compression retainer and a rebound retainer are disposed above and under a piston body. A blow-off reducing unit is disposed between the compression retainer and an auxiliary valve and on a bottom surface of the auxiliary valve to form a plurality of blow-off points, so that a rapid variation in a damping force can be considerably reduced even in a low-speed and middle-speed transition period.