Solenoid-Wedge Engine Brake for Hydraulic-Free Valve Holding
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Solution Overview
Problem
Existing engine brake systems for internal combustion engines are complex and rely heavily on hydraulics for actuating compression release brakes, which can be inefficient and cumbersome.
Innovation Solution
A self-locking engine brake system utilizing a pin and wedge mechanism actuated by a solenoid, which holds open exhaust valves during the compression stroke to provide engine braking, eliminating the need for hydraulic systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydraulic systems are used to actuate compression release engine brakes, then the engine braking function can be achieved, but the system complexity increases and reliability decreases
Solution Approach 1:
The patent replaces the hydraulic actuation system with a direct mechanical linkage system consisting of a control lever, connecting rod, and eccentric cam mechanism. This mechanical substitution eliminates hydraulic components (pumps, hoses, actuators) while achieving the same valve actuation function through pure mechanical means, thereby reducing system complexity and improving reliability.
Solution Approach 2:
The engine brake system is designed to be self-actuating through the engine's own compression stroke. The control lever is positioned to automatically engage the eccentric cam mechanism during the compression stroke, utilizing the engine's natural operating cycle to trigger the braking action without requiring external hydraulic control systems.
2Productivity
If hydraulic systems are used for engine brake actuation, then valve control can be achieved, but the system becomes cumbersome and less efficient
Solution Approach 1:
The patent eliminates hydraulic actuation components (pumps, reservoirs, hoses, control valves) and replaces them with a direct mechanical linkage system. The control lever connects directly to the eccentric cam mechanism through a connecting rod, creating a simple, efficient mechanical transmission path that reduces system complexity while improving responsiveness and efficiency.
Solution Approach 2:
The mechanical linkage system is divided into distinct functional segments: the control lever for operator input, the connecting rod for force transmission, and the eccentric cam mechanism for valve actuation. This segmentation allows each component to be optimized for its specific function while maintaining overall system simplicity and efficiency.
3Reliability
If existing hydraulic engine brake systems are used, then compression release function can be achieved, but the system requires complex hydraulic components
Solution Approach 1:
The patent replaces the hydraulic actuation system with a direct mechanical linkage system consisting of a control lever, connecting rod, and eccentric cam mechanism. This mechanical substitution eliminates hydraulic components (pumps, hoses, actuators) while achieving the same valve actuation function through pure mechanical means, thereby reducing system complexity and improving reliability.
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 provides efficient engine braking with reduced complexity and improved reliability by using a solenoid-actuated pin and wedge mechanism, ensuring consistent valve opening during braking events.
Implementation Method 1
a solenoid coupled to the wedge and configured to actuate the wedge along the second axis
Implementation Method 2
a wedge arranged in the second passage and configured to translate along the second axis and engage with the pin
Data Source
AI summary
An engine brake system, comprising a housing comprising a first passage extending along a first axis, a second passage extending along a second axis that intersects the first axis, the first passage in communication with the second passage. The engine brake system further comprises a pin arranged in the first passage and configured to translate along the first axis to hold open one or more valves of an internal combustion engine, a wedge arranged in the second passage and configured to translate along the second axis and engage with the pin, and a solenoid coupled to the wedge and configured to actuate the wedge along the second axis.