Valve Actuation Device Coupling Mechanism
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Solution Overview
Problem
Existing valve actuation systems for internal combustion engines face challenges in achieving a precise and load-efficient valve stroke shutoff, leading to excessive loads and unwanted half-switches during the actuation of gas exchange valves.
Innovation Solution
A valve actuation device with a coupling device that can be switched between locking and unlocking states, held on a tilting lever, allowing for defined switching between these states, and utilizing a movement element and mechanical spring elements for precise control, ensuring that the coupling device is switched only during the base circle phase of the cam, thus avoiding excessive loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coupling device is not held on the tilting lever, then the switching between locking and unlocking states is not precisely controlled, but excessive loads and unwanted half-switches occur during valve actuation
Solution Approach 1:
The coupling device is merged with the tilting lever by being held on it, ensuring that the coupling device moves together with the tilting lever during actuation. This combination ensures precise switching control while preventing excessive loads and half-switches during valve operation.
2Adaptability or versatility
If the coupling device is switched during the actuation phase, then the valve stroke can be modified, but excessive loads and half-switches occur
Solution Approach 1:
The coupling device is switched preliminarily during the base circle phase before the actual valve actuation begins. This timing ensures that the switching is completed before the cam starts pushing the tilting lever, preventing excessive loads and half-switches while maintaining valve stroke control capability.
3Ease of operation
If a separate actuation mechanism is used for the coupling device, then the switching can be controlled, but the device complexity increases
Solution Approach 1:
The coupling device utilizes the existing motion of the tilting lever during the base circle phase to achieve self-switching. The tilting lever's movement during this phase automatically actuates the coupling device without requiring a separate actuation mechanism, maintaining control while reducing complexity.
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 solution enables a precise and load-efficient valve stroke shutoff, preventing excessive loads and unwanted half-switches, ensuring clear and defined switching of the coupling device, thereby optimizing the operation of gas exchange valves.
Implementation Method 1
utilizing a movement element and mechanical spring elements for precise control
Data Source
AI summary
A valve actuation device for actuating a first and second gas exchange valve of an internal combustion engine. A tilting lever is pivotable between a first starting position and a first actuation position and a valve bridge is movable between a second starting position and a second actuation position. A coupling device is switchable between a locking state, in which the valve bridge is movable out of the second starting position into the second actuation position via the coupling device by the tilting lever, and an unlocking state, in which, despite a movement of the tilting lever out of the first starting position into the first actuation position, there is no movement of the valve bridge out of the second starting position into the second actuation position. The coupling device is held on the tilting lever such that the coupling device is pivotable with the tilting lever.