Variable Compression Ratio Engine Linking Mechanism Vibration Isolation
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Solution Overview
Problem
In variable compression ratio internal combustion engines, the vibration of the first control shaft due to combustion load and inertia forces is transferred to the actuator, reducing its durability and reliability.
Innovation Solution
A linking mechanism is used to pivotally link the first control shaft to a lever, which in turn links to the second control shaft, suppressing the transfer of vibrations from the first control shaft to the actuator by using a first linking pin coupled to a radial arm of the first control shaft and a second linking pin coupled to a radial arm of the second control shaft, thereby reducing the impact on the actuator and decelerator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the actuator is disposed outside the main engine body and linked to the first control shaft via a linking mechanism, then the actuator is protected from oil, exhaust heat, and other harmful factors, but the vibration of the first control shaft is transferred to the actuator, reducing its durability and reliability
Solution Approach 1:
The patent introduces a second control shaft as an intermediary component between the first control shaft and the actuator. The second control shaft is rotatably supported on the housing and links to the first control shaft via a lever, thereby mediating the transmission of rotational position while isolating the actuator from vibrations generated by the first control shaft during engine operation.
2Device complexity
If the first control shaft is directly linked to the actuator, then the structure is simpler, but the combustion load and inertia forces cause vibrations that reduce actuator reliability
Solution Approach 1:
The patent segments the linking mechanism into multiple independent components: the first control shaft, the lever, the second control shaft, and the actuator. This segmentation allows each component to be optimized independently, with the lever and second control shaft specifically designed to filter vibrations while transmitting rotational position information to the actuator.
Solution Approach 2:
The second control shaft serves as an intermediary that decouples the vibration source (first control shaft) from the sensitive component (actuator). By introducing this intermediate element, the system achieves both structural feasibility and vibration isolation without requiring complex active control systems.
Data Source
AI summary
A variable compression ratio internal combustion engine includes a variable compression ratio mechanism, an actuator and a linking mechanism. The actuator is varies and maintains a rotational position of the first control shaft. The linking mechanism includes a second control shaft and a lever. The second control shaft is selectively turned by the actuator. The lever links the second control shaft to the first control shaft such that transference of vibration of the first control shaft to the second control shaft is suppressed. The first control shaft is pivotally linked to a first end of the lever by a first linking pin. The second control shaft is pivotally linked to a second end of the lever by a second linking pin.