Electro-Hydraulic Valve Buffering Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fully variable electro-hydraulic valve systems face issues with rapid seating speed, causing impact damage to valves and sealing surfaces, and hydraulic oil leakage during engine shutdown, leading to system failures.
Innovation Solution
A fully variable electro-hydraulic valve system with a buffering function, featuring a spiral shaft, piston, and buffering ring, which slows down valve seating through a throttling mechanism and maintains engine oil pressure during shutdown to prevent leakage and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the electro-hydraulic valve system uses rapid seating mechanism, then the response speed is improved, but impact damage to valve and sealing surface occurs
Solution Approach 1:
The patent introduces a buffering ring and buffering cavity that create a cushioning effect before the valve completes its seating motion. The buffering ring moves within the buffering cavity, and engine oil within this cavity provides damping to slow down the valve seating process, reducing impact damage while maintaining rapid response capability
Solution Approach 2:
The patent uses engine oil as an intermediary medium within the buffering cavity to provide damping force. The oil's viscosity and compressibility create a controlled resistance that slows the valve seating speed, acting as a mediator between the rapid actuation mechanism and the valve seating action to prevent impact damage
2Device complexity
If the engine shutdown process allows hydraulic oil to drain, then the system simplifies, but leakage and system failure occur
Solution Approach 1:
The patent introduces a check valve that automatically maintains oil pressure in the sliding sleeve cavity before engine shutdown occurs. This preliminary action ensures that when the engine stops, the oil remains pressurized and prevents leakage, maintaining system reliability without adding complex drainage control mechanisms
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 system reduces impact damage, prolongs valve system life, and maintains functionality by controlling valve seating speed and ensuring oil availability during engine shutdown.
Implementation Method 1
the buffering ring and the piston form a buffering cavity; engine oil within the buffering cavity has a damping effect on the movement of the buffering ring
Implementation Method 2
engine oil within the buffering cavity has a damping effect on the movement of the buffering ring
Implementation Method 3
The buffering oil hole communicates with the low-pressure oil circuit of the engine through a throttling device
Implementation Method 4
a one-way valve is arranged on a connecting pipeline between the limiting oil hole and the low-pressure oil circuit of the engine
Data Source
AI summary
A fully variable electro-hydraulic valve system having a buffering function, comprising: a camshaft (101), a valve assembly (106), a sliding sleeve (103), a spiral shaft (102), a piston (105), and a position restoring spring (104). The sliding sleeve (103) is fixed relative to an engine, the piston (105) abuts against the valve assembly (106), and the spiral shaft (102) is controlled by a cam surface of the camshaft (101) in the axial direction. sliding sleeve (103) is provided with a buffering oil hole (123) that communicates with a buffering cavity (R) and with a low-pressure oil circuit of the engine by means of a throttling device (124). When a valve is going to be seated, the piston collides with a buffering ring (121), and due to the effect of the throttling device, engine oil within the buffering cavity has a damping effect on the movement of the buffering ring.