Compression Release In-Cylinder Braking System Oil Circuit
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Solution Overview
Problem
Existing engine in-cylinder braking systems are complex, limited to multi-cylinder engines with even-numbered cylinders, and suffer from power transmission issues due to air entering the oil circuit during shutdown, leading to reduced reliability and increased complexity.
Innovation Solution
A compression release engine in-cylinder braking system that shares an oil supply device among all air cylinders, utilizing an electromagnetic reversing valve, pressure reduction, and pressure relief oil circuits, with a low-pressure relief valve and air release valve to manage oil pressure and prevent air ingress, simplifying the structure and enhancing control precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure transmission oil circuit is provided for each air cylinder with separate oil supply and pressure relief circuits, then the in-cylinder braking function can be achieved, but the oil circuit structure becomes too complicated
Solution Approach 1:
The patent merges the oil supply circuits and pressure relief circuits into a single shared oil circuit system. Multiple air cylinders share common oil supply channels and pressure relief channels, eliminating the need for separate circuits for each cylinder. This reduces the number of hydraulic components and simplifies the overall oil circuit structure while maintaining the in-cylinder braking function.
Solution Approach 2:
The shared oil circuit system serves multiple air cylinders simultaneously, making the oil supply device and pressure relief device universal components that can serve any cylinder in the engine. This multi-functional approach allows the same oil circuit infrastructure to support braking operations across all cylinders without requiring cylinder-specific dedicated circuits.
2Reliability
If air release valves and one-way valves are added to prevent air ingress, then power transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent introduces air release valves and one-way valves as intermediary components in the oil circuit system. These valves act as mediators to prevent air from entering the pressure transmission oil circuit during shutdown, thereby maintaining power transmission reliability. The air release valve allows air to escape while the one-way valve prevents air ingress, working together to protect the hydraulic system.
3Reliability
If the system is designed for multi-cylinder engines with even-numbered cylinders, then the braking function can be implemented, but the application is limited to specific engine configurations
Solution Approach 1:
The patent designs the oil circuit system to be universal across different engine configurations. The shared oil supply device, pressure relief device, and air release valve can serve any number of air cylinders regardless of whether the engine has even or odd number of cylinders. This universal design eliminates the limitation to even-numbered multi-cylinder engines and enables application to various engine types.
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 ensures stable and reliable power transmission, reduces the failure rate, and is not limited by the number of engine cylinders, offering improved application performance and wider compatibility, while preventing air ingress that affects power transmission.
Implementation Method 1
an electromagnetic reversing valve, an oil supply oil circuit, a pressure reduction oil circuit and a pressure relief oil circuit
Implementation Method 2
a compression spring, arranged in the valve cavity and clamped between the valve ball and the valve body oil port II
Implementation Method 3
the oil pump device pumps high-pressure engine oil having a pressure of P to the oil cylinder device through the pressure transmission oil circuit
Implementation Method 4
the engine oil pressure of the engine before pressure reduction is defined as P1, and the engine oil pressure of the engine after pressure reduction is defined as P2
Data Source
AI summary
A compression release engine in-cylinder braking system, comprising a valve mechanism, an oil cylinder device, an oil pump device, and an oil supply device. The oil cylinder device and the oil pump device of each air cylinder communicate with each other through a pressure transmission oil circuit, which communicates with the oil supply device through a low-pressure relief valve. An air release valve is arranged at the high end of an oil circuit system. During in-cylinder braking, the air release valve is closed, an electromagnetic reversing valve is energized, engine oil having a pressure of P1 is supplied to the pressure transmission oil circuit, and a cam abuts against and pushes the oil pump device to pump high-pressure oil to the oil cylinder device, so as to push a rocker arm to open a valve, thereby achieving in-cylinder braking.