Rocker Arm Swing Lock for Selective Valve Deactivation
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Solution Overview
Problem
Existing engine braking systems are complex and costly, requiring multiple moving parts to decouple and reestablish mechanical connections, which can be improved for simpler and more efficient valve deactivation strategies.
Innovation Solution
A rocker arm assembly with a swing lock that rotates between a stopped and idled orientation, allowing the engine valve to be activated or deactivated by trapping or releasing the swing lock between the rocker arm and the engine valve or cam, using a biaser and actuator to control the swing lock's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing engine braking systems use multiple moving parts to decouple and reestablish mechanical connections, then valve deactivation can be achieved, but device complexity increases
Solution Approach 1:
The swing lock combines multiple functions into a single component: it acts as both a mechanical connector and a valve actuator. By integrating the lock mechanism directly into the valve train, the system eliminates the need for separate decoupling devices while maintaining reliable valve deactivation capability.
Solution Approach 2:
The swing lock serves multiple purposes: it transmits cam motion to the valve during normal operation, and when rotated to the idle position, it disconnects the valve from the cam while still remaining part of the same mechanical assembly. This multi-functionality reduces the need for additional specialized components.
2Reliability
If existing engine braking systems use multiple moving parts to decouple and reestablish mechanical connections, then valve deactivation can be achieved, but manufacturing cost increases
Solution Approach 1:
By combining the lock mechanism and valve actuator into a single integrated component, the system reduces the total number of parts that need to be manufactured, assembled, and quality-tested. This integration directly lowers manufacturing complexity and cost while maintaining the required valve deactivation functionality.
3Productivity
If the swing lock is rotated to the idled orientation to deactivate the engine valve, then engine speed control is improved, but mechanical connection is lost
Solution Approach 1:
The swing lock is designed to be dynamically reconfigurable between two stable positions: the engaged position where it transmits motion from cam to valve, and the idle position where it disconnects the valve. This dynamic capability allows the system to adjust mechanical connections in real-time to achieve engine braking while maintaining structural integrity.
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 efficient deactivation of engine valves by simplifying the mechanical connections and reducing the complexity of engine braking systems, allowing for controlled engine speed reduction without the need for multiple moving parts.
Implementation Method 1
a biaser (60) biasing the swing lock (52) toward the stopped orientation
Data Source
AI summary
A rocker arm assembly for an engine valve system includes a rocker arm for actuating an engine valve, a stop, a biaser, and a swing lock attached to one of the valve end or the cam end of the rocker arm and defining a pivot axis, and including an actuating surface. The actuating surface is rotatable between a stopped orientation and an idled orientation, and the biaser biases the swing lock towards the stopped orientation where the swing lock contacts the stop and traps the swing lock between the rocker arm and one of an engine valve or a cam. The swing lock is movable in opposition to a bias of the biaser toward the idled orientation to deactivate the engine valve.