Shock Absorber Piston Valve for Low-Load Speed
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Solution Overview
Problem
Existing shock absorbers exhibit low piston depression speeds and reaction speeds under low loads, limiting their performance.
Innovation Solution
A shock absorber piston with a through conduit and a valve system that allows fluid transfer with minimal pressure loss at low piston speeds, switching to rolling means when piston speed exceeds a threshold, ensuring high-speed movement under low loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional piston with rolling bores is used, then the shock absorber provides basic compression and relaxation functions, but the piston depression speed is low under low loads resulting in low reaction speeds
Solution Approach 1:
The piston structure is segmented into multiple functional zones: a through conduit for primary fluid transfer, rolling bores for secondary transfer, and a valve device with upstream and downstream zones. This segmentation allows each zone to perform specific functions - the through conduit handles high-speed low-load conditions while rolling bores handle high-load conditions, resolving the contradiction between speed and complexity.
Solution Approach 2:
The valve device dynamically switches between open and closed positions based on operating conditions. Under low loads, the valve remains open allowing rapid fluid transfer through the through conduit. Under high loads, the valve closes and fluid transfer occurs through rolling bores. This dynamic adaptation enables the piston to maintain high depression speeds under low loads while providing adequate damping under high loads.
2Speed
If the piston sinking speed increases to improve reaction speed, then the hydraulic pressure in the compression chamber increases and braking force increases, but this creates excessive resistance under low loads
Solution Approach 1:
The system changes the flow path parameters dynamically. Under low loads, fluid flows through the large-diameter through conduit offering minimal resistance. Under high loads, fluid flows through the smaller rolling bores providing greater resistance. This parameter change allows the system to achieve high speeds under low loads without excessive braking force while maintaining adequate braking force under high loads.
Solution Approach 2:
The valve device acts as an intermediary that mediates between the through conduit and rolling bores. It directs fluid flow based on pressure conditions, allowing the system to select the appropriate flow path. This intermediary enables the piston to achieve high depression speeds under low loads by routing flow through the low-resistance through conduit while preventing excessive pressure buildup.
3Reliability
If rolling means are always active for fluid transfer, then the shock absorber provides consistent damping, but the reaction speed is limited under low loads due to pressure losses
Solution Approach 1:
The through conduit is pre-configured as the primary fluid transfer path and remains open by default under normal operating conditions. This preliminary configuration allows rapid fluid transfer without the need for active rolling means engagement. The rolling means serve as a backup or supplementary path that activates only when needed, enabling high speeds under low loads while maintaining damping consistency through the always-available through conduit.
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
Enables high-speed movement of the piston under low loads by minimizing pressure drop and delaying the activation of rolling means until necessary, thereby enhancing the shock absorber's reaction speed.
Implementation Method 1
said valve being urged towards its open position by an elastic member
Implementation Method 2
said valve being urged towards its closing position by the effect of the pressure exerted on it by the working fluid when the latter flows or tends to flow in the conduit from the first large face towards the second large face
Implementation Method 3
the open position of the valve allowing the transfer of the working fluid through the through pipe from the first large face to the second large face
Data Source
Figure 1
Figure 1a
Figure 2
AI summary
The shock absorber piston (1) comprises a first large face (10) designed to be facing the first chamber and a second large face (11), designed to be facing the second chamber, characterised in that it comprises a valve device (2) comprising a valve (20) mounted in sliding fit in the through conduit (12) between an open position allowing the transfer of the working fluid through the conduit (12) from the first face (10) to the second face (11) and a closed position preventing the transfer of the working fluid in the conduit, said valve (20) being biased towards the open position of same by a flexible member (3) and towards the closed position of same by the effect of the pressure that is exerted by the working fluid when the latter flows or tends to flow in the conduit (12) from the first large face (10) to the second large face (11).